Merge remote-tracking branch 'origin/wip/new-backend' into dev

 Conflicts:
	src/qml/compiler/qv4isel_moth.cpp
	src/qml/compiler/qv4jsir_p.h
	src/qml/jsruntime/qv4engine_p.h
	src/qml/jsruntime/qv4vme_moth.cpp
	tests/auto/qml/qml.pro

Change-Id: Ia7b6ec24c7fcbcbb1786d9e798d2df294020ae37

162 files changed, 15585 insertions, 29694 deletions

diff --git a/src/qml/compiler/compiler.pri b/src/qml/compiler/compiler.pri
index d9b985e33b..0d63d3b76f 100644
--- a/src/qml/compiler/compiler.pri
+++ b/src/qml/compiler/compiler.pri
@@ -2,26 +2,24 @@ INCLUDEPATH += $$PWD
 INCLUDEPATH += $$OUT_PWD
 
 HEADERS += \
+    $$PWD/qv4bytecodegenerator_p.h \
     $$PWD/qv4compileddata_p.h \
     $$PWD/qv4compiler_p.h \
+    $$PWD/qv4compilercontext_p.h \
+    $$PWD/qv4compilercontrolflow_p.h \
+    $$PWD/qv4compilerscanfunctions_p.h \
     $$PWD/qv4codegen_p.h \
-    $$PWD/qv4isel_p.h \
-    $$PWD/qv4jsir_p.h \
-    $$PWD/qv4isel_util_p.h \
-    $$PWD/qv4ssa_p.h \
     $$PWD/qqmlirbuilder_p.h \
-    $$PWD/qqmltypecompiler_p.h \
-    $$PWD/qv4jssimplifier_p.h
+    $$PWD/qqmltypecompiler_p.h
 
 SOURCES += \
+    $$PWD/qv4bytecodegenerator.cpp \
     $$PWD/qv4compileddata.cpp \
     $$PWD/qv4compiler.cpp \
+    $$PWD/qv4compilercontext.cpp \
+    $$PWD/qv4compilerscanfunctions.cpp \
     $$PWD/qv4codegen.cpp \
-    $$PWD/qv4isel_p.cpp \
-    $$PWD/qv4jsir.cpp \
-    $$PWD/qv4ssa.cpp \
-    $$PWD/qqmlirbuilder.cpp \
-    $$PWD/qv4jssimplifier.cpp
+    $$PWD/qqmlirbuilder.cpp
 
 !qmldevtools_build {
 
@@ -46,11 +44,9 @@ qtConfig(private_tests):qtConfig(dlopen): QMAKE_USE_PRIVATE += libdl
 
 qmldevtools_build|qtConfig(qml-interpreter) {
     HEADERS += \
-        $$PWD/qv4instr_moth_p.h \
-        $$PWD/qv4isel_moth_p.h
+        $$PWD/qv4instr_moth_p.h
     SOURCES += \
-        $$PWD/qv4instr_moth.cpp \
-        $$PWD/qv4isel_moth.cpp
+        $$PWD/qv4instr_moth.cpp
 }
 
 gcc {
diff --git a/src/qml/compiler/qqmlirbuilder.cpp b/src/qml/compiler/qqmlirbuilder.cpp
index 02ff8947c4..128eb2c720 100644
--- a/src/qml/compiler/qqmlirbuilder.cpp
+++ b/src/qml/compiler/qqmlirbuilder.cpp
@@ -43,6 +43,7 @@
 #include <private/qv4compileddata_p.h>
 #include <private/qqmljsparser_p.h>
 #include <private/qqmljslexer_p.h>
+#include <private/qv4compilerscanfunctions_p.h>
 #include <QCoreApplication>
 #include <QCryptographicHash>
 #include <cmath>
@@ -61,7 +62,7 @@ QT_USE_NAMESPACE
 
 static const quint32 emptyStringIndex = 0;
 
-#ifndef V4_BOOTSTRAP
+#if 0 //ndef V4_BOOTSTRAP
 DEFINE_BOOL_CONFIG_OPTION(lookupHints, QML_LOOKUP_HINTS);
 #endif // V4_BOOTSTRAP
 
@@ -1067,15 +1068,18 @@ void IRBuilder::setBindingValue(QV4::CompiledData::Binding *binding, QQmlJS::AST
         } else if (QQmlJS::AST::NumericLiteral *lit = QQmlJS::AST::cast<QQmlJS::AST::NumericLiteral *>(expr)) {
             binding->type = QV4::CompiledData::Binding::Type_Number;
             binding->setNumberValueInternal(lit->value);
+        } else if (QQmlJS::AST::CallExpression *call = QQmlJS::AST::cast<QQmlJS::AST::CallExpression *>(expr)) {
+            if (QQmlJS::AST::IdentifierExpression *base = QQmlJS::AST::cast<QQmlJS::AST::IdentifierExpression *>(call->base)) {
+                tryGeneratingTranslationBinding(base->name, call->arguments, binding);
+                // If it wasn't a translation binding, a normal script binding will be generated
+                // below.
+            }
         } else if (QQmlJS::AST::cast<QQmlJS::AST::FunctionExpression *>(expr)) {
             binding->flags |= QV4::CompiledData::Binding::IsFunctionExpression;
-        } else {
-
-            if (QQmlJS::AST::UnaryMinusExpression *unaryMinus = QQmlJS::AST::cast<QQmlJS::AST::UnaryMinusExpression *>(expr)) {
-               if (QQmlJS::AST::NumericLiteral *lit = QQmlJS::AST::cast<QQmlJS::AST::NumericLiteral *>(unaryMinus->expression)) {
-                   binding->type = QV4::CompiledData::Binding::Type_Number;
-                   binding->setNumberValueInternal(-lit->value);
-               }
+        } else if (QQmlJS::AST::UnaryMinusExpression *unaryMinus = QQmlJS::AST::cast<QQmlJS::AST::UnaryMinusExpression *>(expr)) {
+            if (QQmlJS::AST::NumericLiteral *lit = QQmlJS::AST::cast<QQmlJS::AST::NumericLiteral *>(unaryMinus->expression)) {
+                binding->type = QV4::CompiledData::Binding::Type_Number;
+                binding->setNumberValueInternal(-lit->value);
             }
         }
     }
@@ -1097,6 +1101,121 @@ void IRBuilder::setBindingValue(QV4::CompiledData::Binding *binding, QQmlJS::AST
     }
 }
 
+void IRBuilder::tryGeneratingTranslationBinding(const QStringRef &base, AST::ArgumentList *args, QV4::CompiledData::Binding *binding)
+{
+    if (base == QLatin1String("qsTr")) {
+        QV4::CompiledData::TranslationData translationData;
+        translationData.number = -1;
+        translationData.commentIndex = 0; // empty string
+
+        if (!args || !args->expression)
+            return; // no arguments, stop
+
+        QStringRef translation;
+        if (QQmlJS::AST::StringLiteral *arg1 = QQmlJS::AST::cast<QQmlJS::AST::StringLiteral *>(args->expression)) {
+            translation = arg1->value;
+        } else {
+            return; // first argument is not a string, stop
+        }
+
+        args = args->next;
+
+        if (args) {
+            QQmlJS::AST::StringLiteral *arg2 = QQmlJS::AST::cast<QQmlJS::AST::StringLiteral *>(args->expression);
+            if (!arg2)
+                return; // second argument is not a string, stop
+            translationData.commentIndex = jsGenerator->registerString(arg2->value.toString());
+
+            args = args->next;
+            if (args) {
+                if (QQmlJS::AST::NumericLiteral *arg3 = QQmlJS::AST::cast<QQmlJS::AST::NumericLiteral *>(args->expression)) {
+                    translationData.number = int(arg3->value);
+                    args = args->next;
+                } else {
+                    return; // third argument is not a translation number, stop
+                }
+            }
+        }
+
+        if (args)
+            return; // too many arguments, stop
+
+        binding->type = QV4::CompiledData::Binding::Type_Translation;
+        binding->stringIndex = jsGenerator->registerString(translation.toString());
+        binding->value.translationData = translationData;
+    } else if (base == QLatin1String("qsTrId")) {
+        QV4::CompiledData::TranslationData translationData;
+        translationData.number = -1;
+        translationData.commentIndex = 0; // empty string, but unused
+
+        if (!args || !args->expression)
+            return; // no arguments, stop
+
+        QStringRef id;
+        if (QQmlJS::AST::StringLiteral *arg1 = QQmlJS::AST::cast<QQmlJS::AST::StringLiteral *>(args->expression)) {
+            id = arg1->value;
+        } else {
+            return; // first argument is not a string, stop
+        }
+
+        args = args->next;
+
+        if (args) {
+            if (QQmlJS::AST::NumericLiteral *arg3 = QQmlJS::AST::cast<QQmlJS::AST::NumericLiteral *>(args->expression)) {
+                translationData.number = int(arg3->value);
+                args = args->next;
+            } else {
+                return; // third argument is not a translation number, stop
+            }
+        }
+
+        if (args)
+            return; // too many arguments, stop
+
+        binding->type = QV4::CompiledData::Binding::Type_TranslationById;
+        binding->stringIndex = jsGenerator->registerString(id.toString());
+        binding->value.translationData = translationData;
+    } else if (base == QLatin1String("QT_TR_NOOP") || base == QLatin1String("QT_TRID_NOOP")) {
+        if (!args || !args->expression)
+            return; // no arguments, stop
+
+        QStringRef str;
+        if (QQmlJS::AST::StringLiteral *arg1 = QQmlJS::AST::cast<QQmlJS::AST::StringLiteral *>(args->expression)) {
+            str = arg1->value;
+        } else {
+            return; // first argument is not a string, stop
+        }
+
+        args = args->next;
+        if (args)
+            return; // too many arguments, stop
+
+        binding->type = QV4::CompiledData::Binding::Type_String;
+        binding->stringIndex = jsGenerator->registerString(str.toString());
+    } else if (base == QLatin1String("QT_TRANSLATE_NOOP")) {
+        if (!args || !args->expression)
+            return; // no arguments, stop
+
+        args = args->next;
+        if (!args || !args->expression)
+            return; // no second arguments, stop
+
+        QStringRef str;
+        if (QQmlJS::AST::StringLiteral *arg2 = QQmlJS::AST::cast<QQmlJS::AST::StringLiteral *>(args->expression)) {
+            str = arg2->value;
+        } else {
+            return; // first argument is not a string, stop
+        }
+
+        args = args->next;
+        if (args)
+            return; // too many arguments, stop
+
+        binding->type = QV4::CompiledData::Binding::Type_String;
+        binding->stringIndex = jsGenerator->registerString(str.toString());
+    }
+}
+
 void IRBuilder::appendBinding(QQmlJS::AST::UiQualifiedId *name, QQmlJS::AST::Statement *value)
 {
     const QQmlJS::AST::SourceLocation qualifiedNameLocation = name->identifierToken;
@@ -1649,9 +1768,10 @@ char *QmlUnitGenerator::writeBindings(char *bindingPtr, const Object *o, Binding
     return bindingPtr;
 }
 
-JSCodeGen::JSCodeGen(const QString &fileName, const QString &sourceCode, QV4::IR::Module *jsModule, QQmlJS::Engine *jsEngine,
+JSCodeGen::JSCodeGen(const QString &sourceCode, QV4::Compiler::JSUnitGenerator *jsUnitGenerator,
+                     QV4::Compiler::Module *jsModule, QQmlJS::Engine *jsEngine,
                      QQmlJS::AST::UiProgram *qmlRoot, QQmlTypeNameCache *imports, const QV4::Compiler::StringTableGenerator *stringPool)
-    : QQmlJS::Codegen(/*strict mode*/false)
+    : QV4::Compiler::Codegen(jsUnitGenerator, /*strict mode*/false)
     , sourceCode(sourceCode)
     , jsEngine(jsEngine)
     , qmlRoot(qmlRoot)
@@ -1660,11 +1780,10 @@ JSCodeGen::JSCodeGen(const QString &fileName, const QString &sourceCode, QV4::IR
     , _disableAcceleratedLookups(false)
     , _contextObject(0)
     , _scopeObject(0)
-    , _qmlContextTemp(-1)
-    , _importedScriptsTemp(-1)
+    , _qmlContextSlot(-1)
+    , _importedScriptsSlot(-1)
 {
     _module = jsModule;
-    _module->setFileName(fileName);
     _fileNameIsUrl = true;
 }
 
@@ -1684,8 +1803,8 @@ QVector<int> JSCodeGen::generateJSCodeForFunctionsAndBindings(const QList<Compil
 {
     QVector<int> runtimeFunctionIndices(functions.size());
 
-    ScanFunctions scan(this, sourceCode, GlobalCode);
-    scan.enterEnvironment(0, QmlBinding);
+    QV4::Compiler::ScanFunctions scan(this, sourceCode, QV4::Compiler::GlobalCode);
+    scan.enterEnvironment(0, QV4::Compiler::QmlBinding);
     scan.enterQmlScope(qmlRoot, QStringLiteral("context scope"));
     for (const CompiledFunctionOrExpression &f : functions) {
         Q_ASSERT(f.node != qmlRoot);
@@ -1694,7 +1813,7 @@ QVector<int> JSCodeGen::generateJSCodeForFunctionsAndBindings(const QList<Compil
         if (function)
             scan.enterQmlFunction(function);
         else
-            scan.enterEnvironment(f.node, QmlBinding);
+            scan.enterEnvironment(f.node, QV4::Compiler::QmlBinding);
 
         scan(function ? function->body : f.node);
         scan.leaveEnvironment();
@@ -1702,8 +1821,7 @@ QVector<int> JSCodeGen::generateJSCodeForFunctionsAndBindings(const QList<Compil
     scan.leaveEnvironment();
     scan.leaveEnvironment();
 
-    _variableEnvironment = 0;
-    _function = _module->functions.at(defineFunction(QStringLiteral("context scope"), qmlRoot, 0, 0));
+    _context = 0;
 
     for (int i = 0; i < functions.count(); ++i) {
         const CompiledFunctionOrExpression &qmlFunction = functions.at(i);
@@ -1745,35 +1863,36 @@ QVector<int> JSCodeGen::generateJSCodeForFunctionsAndBindings(const QList<Compil
         runtimeFunctionIndices[i] = idx;
     }
 
-    qDeleteAll(_envMap);
-    _envMap.clear();
     return runtimeFunctionIndices;
 }
 
+int JSCodeGen::defineFunction(const QString &name, AST::Node *ast, AST::FormalParameterList *formals, AST::SourceElements *body)
+{
+    int qmlContextTemp = -1;
+    int importedScriptsTemp = -1;
+    qSwap(_qmlContextSlot, qmlContextTemp);
+    qSwap(_importedScriptsSlot, importedScriptsTemp);
+
+    int result = Codegen::defineFunction(name, ast, formals, body);
+
+    qSwap(_importedScriptsSlot, importedScriptsTemp);
+    qSwap(_qmlContextSlot, qmlContextTemp);
+
+    return result;
+}
+
 #ifndef V4_BOOTSTRAP
-QQmlPropertyData *JSCodeGen::lookupQmlCompliantProperty(QQmlPropertyCache *cache, const QString &name, bool *propertyExistsButForceNameLookup)
+QQmlPropertyData *JSCodeGen::lookupQmlCompliantProperty(QQmlPropertyCache *cache, const QString &name)
 {
-    if (propertyExistsButForceNameLookup)
-        *propertyExistsButForceNameLookup = false;
     QQmlPropertyData *pd = cache->property(name, /*object*/0, /*context*/0);
 
     // Q_INVOKABLEs can't be FINAL, so we have to look them up at run-time
-    if (pd && pd->isFunction()) {
-        if (propertyExistsButForceNameLookup)
-            *propertyExistsButForceNameLookup = true;
-        pd = 0;
-    }
+    if (!pd || pd->isFunction())
+        return 0;
 
-    if (pd && !cache->isAllowedInRevision(pd))
-        pd = 0;
+    if (!cache->isAllowedInRevision(pd))
+        return 0;
 
-    // Return a copy allocated from our memory pool. Property data pointers can change
-    // otherwise when the QQmlPropertyCache changes later in the QML type compilation process.
-    if (pd) {
-        QQmlPropertyData *copy = pd;
-        pd = _function->New<QQmlPropertyData>();
-        *pd = *copy;
-    }
     return pd;
 }
 
@@ -1784,7 +1903,9 @@ enum MetaObjectResolverFlags {
     ResolveTypeInformationOnly = 0x8
 };
 
+#if 0
 static void initMetaObjectResolver(QV4::IR::MemberExpressionResolver *resolver, QQmlPropertyCache *metaObject);
+
 static void initScopedEnumResolver(QV4::IR::MemberExpressionResolver *resolver, const QQmlType &qmlType, int index);
 
 static QV4::IR::DiscoveredType resolveQmlType(QQmlEnginePrivate *qmlEngine,
@@ -2018,34 +2139,40 @@ static void initScopedEnumResolver(QV4::IR::MemberExpressionResolver *resolver,
     resolver->qmlType = qmlType;
     resolver->flags = index;
 }
+#endif
 
 #endif // V4_BOOTSTRAP
 
 void JSCodeGen::beginFunctionBodyHook()
 {
-    _qmlContextTemp = _block->newTemp();
-    _importedScriptsTemp = _block->newTemp();
+    _qmlContextSlot = bytecodeGenerator->newRegister();
+    _importedScriptsSlot = bytecodeGenerator->newRegister();
 
 #ifndef V4_BOOTSTRAP
-    QV4::IR::Temp *temp = _block->TEMP(_qmlContextTemp);
+    Instruction::LoadQmlContext load;
+    load.result = Reference::fromStackSlot(this, _qmlContextSlot).stackSlot();
+    bytecodeGenerator->addInstruction(load);
+
+#if 0
     temp->type = QV4::IR::QObjectType;
     temp->memberResolver = _function->New<QV4::IR::MemberExpressionResolver>();
     initMetaObjectResolver(temp->memberResolver, _scopeObject);
     auto name = _block->NAME(QV4::IR::Name::builtin_qml_context, 0, 0);
     name->type = temp->type;
-    move(temp, name);
+#endif
 
-    move(_block->TEMP(_importedScriptsTemp), _block->NAME(QV4::IR::Name::builtin_qml_imported_scripts_object, 0, 0));
+    Instruction::LoadQmlImportedScripts loadScripts;
+    loadScripts.result = Reference::fromStackSlot(this, _importedScriptsSlot).stackSlot();
+    bytecodeGenerator->addInstruction(loadScripts);
 #endif
 }
 
-QV4::IR::Expr *JSCodeGen::fallbackNameLookup(const QString &name, int line, int col)
+QV4::Compiler::Codegen::Reference JSCodeGen::fallbackNameLookup(const QString &name)
 {
-    Q_UNUSED(line)
-    Q_UNUSED(col)
 #ifndef V4_BOOTSTRAP
     if (_disableAcceleratedLookups)
-        return 0;
+        return Reference();
+
     // Implement QML lookup semantics in the current file context.
     //
     // Note: We do not check if properties of the qml scope object or context object
@@ -2060,20 +2187,16 @@ QV4::IR::Expr *JSCodeGen::fallbackNameLookup(const QString &name, int line, int
     // Look for IDs first.
     for (const IdMapping &mapping : qAsConst(_idObjects)) {
         if (name == mapping.name) {
-            if (_function->isQmlBinding)
-                _function->idObjectDependencies.insert(mapping.idIndex);
-
-            QV4::IR::Expr *s = _block->MEMBER(_block->TEMP(_qmlContextTemp), _function->newString(name), 0, QV4::IR::Member::MemberOfIdObjectsArray, mapping.idIndex);
-            QV4::IR::Temp *result = _block->TEMP(_block->newTemp());
-            _block->MOVE(result, s);
-            result = _block->TEMP(result->index);
-            if (mapping.type) {
-                result->memberResolver = _function->New<QV4::IR::MemberExpressionResolver>();
-                result->memberResolver->owner = _function;
-                initMetaObjectResolver(result->memberResolver, mapping.type);
-                result->memberResolver->flags |= AllPropertiesAreFinal;
-            }
-            result->isReadOnly = true; // don't allow use as lvalue
+            if (_context->compilationMode == QV4::Compiler::QmlBinding)
+                _context->idObjectDependencies.insert(mapping.idIndex);
+
+            Instruction::LoadIdObject load;
+            load.base = Reference::fromStackSlot(this, _qmlContextSlot).stackSlot();
+            load.index = mapping.idIndex;
+
+            Reference result = Reference::fromAccumulator(this);
+            bytecodeGenerator->addInstruction(load);
+            result.isReadonly = true;
             return result;
         }
     }
@@ -2082,69 +2205,47 @@ QV4::IR::Expr *JSCodeGen::fallbackNameLookup(const QString &name, int line, int
         QQmlTypeNameCache::Result r = imports->query(name);
         if (r.isValid()) {
             if (r.scriptIndex != -1) {
-                return _block->SUBSCRIPT(_block->TEMP(_importedScriptsTemp),
-                                         _block->CONST(QV4::IR::SInt32Type, r.scriptIndex));
+                Reference imports = Reference::fromStackSlot(this, _importedScriptsSlot);
+                return Reference::fromSubscript(imports, Reference::fromConst(this, QV4::Encode(r.scriptIndex)));
             } else if (r.type.isValid()) {
-                QV4::IR::Name *typeName = _block->NAME(name, line, col);
-                // Make sure the run-time loads this through the more efficient singleton getter.
-                typeName->qmlSingleton = r.type.isCompositeSingleton();
-                typeName->freeOfSideEffects = true;
-                QV4::IR::Temp *result = _block->TEMP(_block->newTemp());
-                _block->MOVE(result, typeName);
-
-                result = _block->TEMP(result->index);
-                result->memberResolver = _function->New<QV4::IR::MemberExpressionResolver>();
-                result->memberResolver->owner = _function;
-                initQmlTypeResolver(result->memberResolver, r.type);
-                return result;
+                if (r.type.isCompositeSingleton()) {
+                    Instruction::LoadQmlSingleton load;
+                    load.name = registerString(name);
+                    bytecodeGenerator->addInstruction(load);
+                    return Reference::fromAccumulator(this);
+                }
+                return Reference::fromName(this, name);
             } else {
                 Q_ASSERT(r.importNamespace);
-                QV4::IR::Name *namespaceName = _block->NAME(name, line, col);
-                namespaceName->freeOfSideEffects = true;
-                QV4::IR::Temp *result = _block->TEMP(_block->newTemp());
-                result->memberResolver = _function->New<QV4::IR::MemberExpressionResolver>();
-                result->memberResolver->owner = _function;
-                initImportNamespaceResolver(result->memberResolver, imports, r.importNamespace);
-
-                _block->MOVE(result, namespaceName);
-                return _block->TEMP(result->index);
+                return Reference::fromName(this, name);
             }
         }
     }
 
     if (_scopeObject) {
-        bool propertyExistsButForceNameLookup = false;
-        QQmlPropertyData *pd = lookupQmlCompliantProperty(_scopeObject, name, &propertyExistsButForceNameLookup);
-        if (propertyExistsButForceNameLookup)
-            return 0;
-        if (pd) {
-            QV4::IR::Temp *base = _block->TEMP(_qmlContextTemp);
-            base->memberResolver = _function->New<QV4::IR::MemberExpressionResolver>();
-            base->memberResolver->owner = _function;
-            initMetaObjectResolver(base->memberResolver, _scopeObject);
-            return _block->MEMBER(base, _function->newString(name), pd, QV4::IR::Member::MemberOfQmlScopeObject);
-        }
+        QQmlPropertyData *data = lookupQmlCompliantProperty(_scopeObject, name);
+        if (!data)
+            return Reference::fromName(this, name);
+        Reference base = Reference::fromStackSlot(this, _qmlContextSlot);
+        bool captureRequired = !data->isConstant() && !data->isQmlBinding();
+        return Reference::fromQmlScopeObject(base, data->coreIndex(), data->notifyIndex(),
+                                             captureRequired);
     }
 
     if (_contextObject) {
-        bool propertyExistsButForceNameLookup = false;
-        QQmlPropertyData *pd = lookupQmlCompliantProperty(_contextObject, name, &propertyExistsButForceNameLookup);
-        if (propertyExistsButForceNameLookup)
-            return 0;
-        if (pd) {
-            QV4::IR::Temp *base = _block->TEMP(_qmlContextTemp);
-            base->memberResolver = _function->New<QV4::IR::MemberExpressionResolver>();
-            base->memberResolver->owner = _function;
-            initMetaObjectResolver(base->memberResolver, _contextObject);
-            return _block->MEMBER(base, _function->newString(name), pd, QV4::IR::Member::MemberOfQmlContextObject);
-        }
+        QQmlPropertyData *data = lookupQmlCompliantProperty(_contextObject, name);
+        if (!data)
+            return Reference::fromName(this, name);
+        Reference base = Reference::fromStackSlot(this, _qmlContextSlot);
+        bool captureRequired = !data->isConstant() && !data->isQmlBinding();
+        return Reference::fromQmlContextObject(base, data->coreIndex(), data->notifyIndex(),
+                                               captureRequired);
     }
-
 #else
     Q_UNUSED(name)
 #endif // V4_BOOTSTRAP
     // fall back to name lookup at run-time.
-    return 0;
+    return Reference();
 }
 
 #ifndef V4_BOOTSTRAP
diff --git a/src/qml/compiler/qqmlirbuilder_p.h b/src/qml/compiler/qqmlirbuilder_p.h
index a5b4815745..406c939998 100644
--- a/src/qml/compiler/qqmlirbuilder_p.h
+++ b/src/qml/compiler/qqmlirbuilder_p.h
@@ -453,7 +453,7 @@ struct Q_QML_PRIVATE_EXPORT Document
     Document(bool debugMode);
     QString code;
     QQmlJS::Engine jsParserEngine;
-    QV4::IR::Module jsModule;
+    QV4::Compiler::Module jsModule;
     QList<const QV4::CompiledData::Import *> imports;
     QList<Pragma*> pragmas;
     QQmlJS::AST::UiProgram *program;
@@ -527,6 +527,7 @@ public:
                          const QQmlJS::AST::SourceLocation &last) const;
 
     void setBindingValue(QV4::CompiledData::Binding *binding, QQmlJS::AST::Statement *statement);
+    void tryGeneratingTranslationBinding(const QStringRef &base, QQmlJS::AST::ArgumentList *args, QV4::CompiledData::Binding *binding);
 
     void appendBinding(QQmlJS::AST::UiQualifiedId *name, QQmlJS::AST::Statement *value);
     void appendBinding(QQmlJS::AST::UiQualifiedId *name, int objectIndex, bool isOnAssignment = false);
@@ -606,9 +607,9 @@ struct Q_QML_EXPORT PropertyResolver
 };
 #endif
 
-struct Q_QML_PRIVATE_EXPORT JSCodeGen : public QQmlJS::Codegen
+struct Q_QML_PRIVATE_EXPORT JSCodeGen : public QV4::Compiler::Codegen
 {
-    JSCodeGen(const QString &fileName, const QString &sourceCode, QV4::IR::Module *jsModule,
+    JSCodeGen(const QString &sourceCode, QV4::Compiler::JSUnitGenerator *jsUnitGenerator, QV4::Compiler::Module *jsModule,
               QQmlJS::Engine *jsEngine, QQmlJS::AST::UiProgram *qmlRoot, QQmlTypeNameCache *imports,
               const QV4::Compiler::StringTableGenerator *stringPool);
 
@@ -626,12 +627,17 @@ struct Q_QML_PRIVATE_EXPORT JSCodeGen : public QQmlJS::Codegen
     // Returns mapping from input functions to index in IR::Module::functions / compiledData->runtimeFunctions
     QVector<int> generateJSCodeForFunctionsAndBindings(const QList<CompiledFunctionOrExpression> &functions);
 
+    int defineFunction(const QString &name, AST::Node *ast,
+                       AST::FormalParameterList *formals,
+                       AST::SourceElements *body) override;
+
 protected:
     void beginFunctionBodyHook() override;
-    QV4::IR::Expr *fallbackNameLookup(const QString &name, int line, int col) override;
+    Reference fallbackNameLookup(const QString &name) override;
 
 private:
-    QQmlPropertyData *lookupQmlCompliantProperty(QQmlPropertyCache *cache, const QString &name, bool *propertyExistsButForceNameLookup = 0);
+    // returns nullptr if lookup needs to happen by name
+    QQmlPropertyData *lookupQmlCompliantProperty(QQmlPropertyCache *cache, const QString &name);
 
     QString sourceCode;
     QQmlJS::Engine *jsEngine; // needed for memory pool
@@ -643,8 +649,8 @@ private:
     ObjectIdMapping _idObjects;
     QQmlPropertyCache *_contextObject;
     QQmlPropertyCache *_scopeObject;
-    int _qmlContextTemp;
-    int _importedScriptsTemp;
+    int _qmlContextSlot;
+    int _importedScriptsSlot;
 };
 
 struct Q_QML_PRIVATE_EXPORT IRLoader {
diff --git a/src/qml/compiler/qqmltypecompiler.cpp b/src/qml/compiler/qqmltypecompiler.cpp
index 46f0c46b99..97ca597953 100644
--- a/src/qml/compiler/qqmltypecompiler.cpp
+++ b/src/qml/compiler/qqmltypecompiler.cpp
@@ -44,10 +44,9 @@
 #include <private/qqmlcustomparser_p.h>
 #include <private/qqmlvmemetaobject_p.h>
 #include <private/qqmlcomponent_p.h>
-#include <private/qv4ssa_p.h>
 
 #include "qqmlpropertycachecreator_p.h"
-#include "qv4jssimplifier_p.h"
+//#include "qv4jssimplifier_p.h"
 
 #define COMPILE_EXCEPTION(token, desc) \
     { \
@@ -140,19 +139,15 @@ QV4::CompiledData::CompilationUnit *QQmlTypeCompiler::compile()
             sss.scan();
         }
 
-        QmlIR::JSCodeGen v4CodeGenerator(typeData->finalUrlString(), document->code, &document->jsModule, &document->jsParserEngine, document->program, typeNameCache, &document->jsGenerator.stringTable);
+        document->jsModule.fileName = typeData->finalUrlString();
+        QmlIR::JSCodeGen v4CodeGenerator(document->code, &document->jsGenerator, &document->jsModule, &document->jsParserEngine, document->program, typeNameCache, &document->jsGenerator.stringTable);
+        v4CodeGenerator.setUseFastLookups(false);
+        // ###        v4CodeGenerator.setUseTypeInference(true);
         QQmlJSCodeGenerator jsCodeGen(this, &v4CodeGenerator);
         if (!jsCodeGen.generateCodeForComponents())
             return nullptr;
 
-        QQmlJavaScriptBindingExpressionSimplificationPass pass(document->objects, &document->jsModule, &document->jsGenerator);
-        pass.reduceTranslationBindings();
-
-        QV4::ExecutionEngine *v4 = engine->v4engine();
-        QScopedPointer<QV4::EvalInstructionSelection> isel(v4->iselFactory->create(engine, v4->executableAllocator, &document->jsModule, &document->jsGenerator));
-        isel->setUseFastLookups(false);
-        isel->setUseTypeInference(true);
-        document->javaScriptCompilationUnit = isel->compile(/*generated unit data*/false);
+        document->javaScriptCompilationUnit = v4CodeGenerator.generateCompilationUnit(/*generated unit data*/false);
     }
 
     // Generate QML compiled type data structures
@@ -208,11 +203,6 @@ int QQmlTypeCompiler::registerString(const QString &str)
     return document->jsGenerator.registerString(str);
 }
 
-QV4::IR::Module *QQmlTypeCompiler::jsIRModule() const
-{
-    return &document->jsModule;
-}
-
 const QV4::CompiledData::Unit *QQmlTypeCompiler::qmlUnit() const
 {
     return document->javaScriptCompilationUnit->data;
@@ -501,7 +491,9 @@ bool SignalHandlerConverter::convertSignalHandlerExpressionsToFunctionDeclaratio
             QQmlJS::AST::FunctionBody *body = new (pool) QQmlJS::AST::FunctionBody(elements);
 
             functionDeclaration = new (pool) QQmlJS::AST::FunctionDeclaration(compiler->newStringRef(stringAt(binding->propertyNameIndex)), paramList, body);
-            functionDeclaration->functionToken = foe->node->firstSourceLocation();
+            functionDeclaration->lbraceToken = functionDeclaration->functionToken
+                    = foe->node->firstSourceLocation();
+            functionDeclaration->rbraceToken = foe->node->lastSourceLocation();
         }
         foe->node = functionDeclaration;
         binding->propertyNameIndex = compiler->registerString(propertyName);
diff --git a/src/qml/compiler/qqmltypecompiler_p.h b/src/qml/compiler/qqmltypecompiler_p.h
index 4878a90641..d905b956c7 100644
--- a/src/qml/compiler/qqmltypecompiler_p.h
+++ b/src/qml/compiler/qqmltypecompiler_p.h
@@ -111,8 +111,6 @@ public:
 
     int registerString(const QString &str);
 
-    QV4::IR::Module *jsIRModule() const;
-
     const QV4::CompiledData::Unit *qmlUnit() const;
 
     QUrl url() const { return typeData->finalUrl(); }
diff --git a/src/qml/compiler/qv4bytecodegenerator.cpp b/src/qml/compiler/qv4bytecodegenerator.cpp
new file mode 100644
index 0000000000..05bbf25292
--- /dev/null
+++ b/src/qml/compiler/qv4bytecodegenerator.cpp
@@ -0,0 +1,211 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <private/qv4bytecodegenerator_p.h>
+#include <private/qv4compilercontext_p.h>
+#include <private/qqmljsastfwd_p.h>
+#include <private/qv4compileddata_p.h>
+
+QT_USE_NAMESPACE
+using namespace QV4;
+using namespace Moth;
+
+void BytecodeGenerator::setLocation(const QQmlJS::AST::SourceLocation &loc)
+{
+    currentLine = static_cast<int>(loc.startLine);
+}
+
+int BytecodeGenerator::newRegister()
+{
+    int t = currentReg++;
+    if (regCount < currentReg)
+        regCount = currentReg;
+    return t;
+}
+
+int BytecodeGenerator::newRegisterArray(int n)
+{
+    int t = currentReg;
+    currentReg += n;
+    if (regCount < currentReg)
+        regCount = currentReg;
+    return t;
+}
+
+void BytecodeGenerator::packInstruction(I &i)
+{
+    uchar type = *reinterpret_cast<uchar *>(i.packed);
+    Q_ASSERT(type >= MOTH_NUM_INSTRUCTIONS());
+    if (type >= MOTH_NUM_INSTRUCTIONS())
+        type -= MOTH_NUM_INSTRUCTIONS();
+    int instructionsAsInts[sizeof(Instr)/sizeof(int)];
+    int nMembers = Moth::InstrInfo::argumentCount[static_cast<int>(i.type)];
+    memcpy(instructionsAsInts, i.packed + 1, nMembers*sizeof(int));
+    enum {
+        Normal,
+        Wide
+    } width = Normal;
+    for (int n = 0; n < nMembers; ++n) {
+        if (width == Normal && (static_cast<char>(instructionsAsInts[n]) != instructionsAsInts[n]))
+            width = Wide;
+    }
+    char *code = i.packed;
+    switch (width) {
+    case Normal:
+        *reinterpret_cast<uchar *>(code) = type;
+        ++code;
+        for (int n = 0; n < nMembers; ++n) {
+            char v = static_cast<char>(instructionsAsInts[n]);
+            memcpy(code, &v, 1);
+            code += 1;
+        }
+        i.size = code - i.packed;
+        if (i.offsetForJump != -1)
+            i.offsetForJump = i.size - 1;
+        break;
+    case Wide:
+        // nothing to do
+        break;
+    }
+}
+
+void BytecodeGenerator::adjustJumpOffsets()
+{
+    for (int index = 0; index < instructions.size(); ++index) {
+        auto &i = instructions[index];
+        if (i.offsetForJump == -1) // no jump
+            continue;
+        Q_ASSERT(i.linkedLabel != -1 && labels.at(i.linkedLabel) != -1);
+        const auto &linkedInstruction = instructions.at(labels.at(i.linkedLabel));
+        char *c = i.packed + i.offsetForJump;
+        int jumpOffset = linkedInstruction.position - (i.position + i.size);
+//        qDebug() << "adjusting jump offset for instruction" << index << i.position << i.size << "offsetForJump" << i.offsetForJump << "target"
+//                 << labels.at(i.linkedLabel) << linkedInstruction.position << "jumpOffset" << jumpOffset;
+        uchar type = *reinterpret_cast<const uchar *>(i.packed);
+        if (type >= MOTH_NUM_INSTRUCTIONS()) {
+            Q_ASSERT(i.offsetForJump == i.size - 4);
+            memcpy(c, &jumpOffset, sizeof(int));
+        } else {
+            Q_ASSERT(i.offsetForJump == i.size - 1);
+            char o = jumpOffset;
+            Q_ASSERT(o == jumpOffset);
+            *c = o;
+        }
+    }
+}
+
+void BytecodeGenerator::compressInstructions()
+{
+    // first round: compress all non jump instructions
+    int position = 0;
+    for (auto &i : instructions) {
+        i.position = position;
+        if (i.offsetForJump == -1)
+            packInstruction(i);
+        position += i.size;
+    }
+
+    adjustJumpOffsets();
+
+    // compress all jumps
+    position = 0;
+    for (auto &i : instructions) {
+        i.position = position;
+        if (i.offsetForJump != -1)
+            packInstruction(i);
+        position += i.size;
+    }
+
+    // adjust once again, as the packing above could have changed offsets
+    adjustJumpOffsets();
+}
+
+void BytecodeGenerator::finalize(Compiler::Context *context)
+{
+    compressInstructions();
+
+    // collect content and line numbers
+    QByteArray code;
+    QVector<CompiledData::CodeOffsetToLine> lineNumbers;
+    currentLine = -1;
+    Q_UNUSED(startLine);
+    for (const auto &i : qAsConst(instructions)) {
+        if (i.line != currentLine) {
+            currentLine = i.line;
+            CompiledData::CodeOffsetToLine entry;
+            entry.codeOffset = code.size();
+            entry.line = currentLine;
+            lineNumbers.append(entry);
+        }
+        code.append(i.packed, i.size);
+    }
+
+    context->code = code;
+    context->lineNumberMapping = lineNumbers;
+}
+
+int BytecodeGenerator::addInstructionHelper(Instr::Type type, const Instr &i, int offsetOfOffset) {
+    if (debugMode && type != Instr::Type::Debug) {
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_GCC("-Wmaybe-uninitialized") // broken gcc warns about Instruction::Debug()
+        if (instructions.isEmpty() || currentLine != instructions.constLast().line) {
+            addInstruction(Instruction::Debug());
+        } else if (type == Instr::Type::Ret) {
+            currentLine = -currentLine;
+            addInstruction(Instruction::Debug());
+            currentLine = -currentLine;
+        }
+QT_WARNING_POP
+    }
+
+    const int pos = instructions.size();
+
+    int s = Moth::InstrInfo::argumentCount[static_cast<int>(type)]*sizeof(int);
+    if (offsetOfOffset != -1)
+        offsetOfOffset += 1;
+    I instr{type, static_cast<short>(s + 1), 0, currentLine, offsetOfOffset, -1, "\0\0" };
+    char *code = instr.packed;
+    *reinterpret_cast<uchar *>(code) = static_cast<uchar>(MOTH_NUM_INSTRUCTIONS() + static_cast<int>(type));
+    ++code;
+    Q_ASSERT(MOTH_NUM_INSTRUCTIONS() + static_cast<int>(type) < 256);
+    memcpy(code, &i, s);
+    instructions.append(instr);
+
+    return pos;
+}
diff --git a/src/qml/compiler/qv4bytecodegenerator_p.h b/src/qml/compiler/qv4bytecodegenerator_p.h
new file mode 100644
index 0000000000..3d516da922
--- /dev/null
+++ b/src/qml/compiler/qv4bytecodegenerator_p.h
@@ -0,0 +1,282 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QV4BYTECODEGENERATOR_P_H
+#define QV4BYTECODEGENERATOR_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+#include <private/qv4instr_moth_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QQmlJS {
+namespace AST {
+class SourceLocation;
+}
+}
+
+namespace QV4 {
+namespace Moth {
+
+class BytecodeGenerator {
+public:
+    BytecodeGenerator(int line, bool debug)
+        : startLine(line), debugMode(debug) {}
+
+    struct Label {
+        enum LinkMode {
+            LinkNow,
+            LinkLater
+        };
+        Label() = default;
+        Label(BytecodeGenerator *generator, LinkMode mode = LinkNow)
+            : generator(generator),
+              index(generator->labels.size()) {
+            generator->labels.append(mode == LinkNow ? generator->instructions.size() : -1);
+        }
+        static Label returnLabel() {
+            Label l;
+            l.index = INT_MAX;
+            return l;
+        }
+        bool isReturn() const {
+            return index == INT_MAX;
+        }
+
+        void link() {
+            Q_ASSERT(index >= 0);
+            Q_ASSERT(generator->labels[index] == -1);
+            generator->labels[index] = generator->instructions.size();
+        }
+
+        BytecodeGenerator *generator = 0;
+        int index = -1;
+    };
+
+    struct Jump {
+        Jump(BytecodeGenerator *generator, int instruction)
+            : generator(generator),
+              index(instruction)
+        {}
+        ~Jump() {
+            Q_ASSERT(generator->instructions[index].linkedLabel != -1);
+        }
+
+
+        BytecodeGenerator *generator;
+        int index;
+
+        void link() {
+            link(generator->label());
+        }
+        void link(Label l) {
+            Q_ASSERT(l.index >= 0);
+            Q_ASSERT(generator->instructions[index].linkedLabel == -1);
+            generator->instructions[index].linkedLabel = l.index;
+        }
+    };
+
+    struct ExceptionHandler : public Label {
+        ExceptionHandler(BytecodeGenerator *generator)
+            : Label(generator, LinkLater)
+        {
+        }
+        ~ExceptionHandler()
+        {
+            Q_ASSERT(generator->currentExceptionHandler != this);
+        }
+    };
+
+    Label label() {
+        return Label(this, Label::LinkNow);
+    }
+
+    Label newLabel() {
+        return Label(this, Label::LinkLater);
+    }
+
+    ExceptionHandler newExceptionHandler() {
+        return ExceptionHandler(this);
+    }
+
+    template<int InstrT>
+    void addInstruction(const InstrData<InstrT> &data)
+    {
+        Instr genericInstr;
+        InstrMeta<InstrT>::setData(genericInstr, data);
+        addInstructionHelper(Moth::Instr::Type(InstrT), genericInstr);
+    }
+
+    Q_REQUIRED_RESULT Jump jump()
+    {
+        Instruction::Jump data;
+        return addJumpInstruction(data);
+    }
+
+    Q_REQUIRED_RESULT Jump jumpTrue()
+    {
+        Instruction::JumpTrue data;
+        return addJumpInstruction(data);
+    }
+
+    Q_REQUIRED_RESULT Jump jumpFalse()
+    {
+        Instruction::JumpFalse data;
+        return addJumpInstruction(data);
+    }
+
+    void jumpStrictEqual(const StackSlot &lhs, const Label &target)
+    {
+        Instruction::CmpStrictEqual cmp;
+        cmp.lhs = lhs;
+        addInstruction(cmp);
+        addJumpInstruction(Instruction::JumpTrue()).link(target);
+    }
+
+    void jumpStrictNotEqual(const StackSlot &lhs, const Label &target)
+    {
+        Instruction::CmpStrictNotEqual cmp;
+        cmp.lhs = lhs;
+        addInstruction(cmp);
+        addJumpInstruction(Instruction::JumpTrue()).link(target);
+    }
+
+    Q_REQUIRED_RESULT Jump jumpStrictEqualStackSlotInt(const StackSlot &lhs, int rhs)
+    {
+        Instruction::JumpStrictEqualStackSlotInt data;
+        data.lhs = lhs;
+        data.rhs = rhs;
+        return addJumpInstruction(data);
+    }
+
+    Q_REQUIRED_RESULT Jump jumpStrictNotEqualStackSlotInt(const StackSlot &lhs, int rhs)
+    {
+        Instruction::JumpStrictNotEqualStackSlotInt data;
+        data.lhs = lhs;
+        data.rhs = rhs;
+        return addJumpInstruction(data);
+    }
+
+    void setExceptionHandler(ExceptionHandler *handler)
+    {
+        currentExceptionHandler = handler;
+        Instruction::SetExceptionHandler data;
+        data.offset = 0;
+        if (!handler)
+            addInstruction(data);
+        else
+            addJumpInstruction(data).link(*handler);
+    }
+
+    void setLocation(const QQmlJS::AST::SourceLocation &loc);
+
+    ExceptionHandler *exceptionHandler() const {
+        return currentExceptionHandler;
+    }
+
+    int newRegister();
+    int newRegisterArray(int n);
+    int registerCount() const { return regCount; }
+
+    void finalize(Compiler::Context *context);
+
+    template<int InstrT>
+    Jump addJumpInstruction(const InstrData<InstrT> &data)
+    {
+        Instr genericInstr;
+        InstrMeta<InstrT>::setData(genericInstr, data);
+        return Jump(this, addInstructionHelper(Moth::Instr::Type(InstrT), genericInstr, offsetof(InstrData<InstrT>, offset)));
+    }
+
+    void addCJumpInstruction(bool jumpOnFalse, const Label *trueLabel, const Label *falseLabel)
+    {
+        if (jumpOnFalse)
+            addJumpInstruction(Instruction::JumpFalse()).link(*falseLabel);
+        else
+            addJumpInstruction(Instruction::JumpTrue()).link(*trueLabel);
+    }
+
+private:
+    friend struct Jump;
+    friend struct Label;
+    friend struct ExceptionHandler;
+
+    int addInstructionHelper(Moth::Instr::Type type, const Instr &i, int offsetOfOffset = -1);
+
+    struct I {
+        Moth::Instr::Type type;
+        short size;
+        uint position;
+        int line;
+        int offsetForJump;
+        int linkedLabel;
+        char packed[sizeof(Instr) + 2]; // 2 for instruction and prefix
+    };
+
+    void compressInstructions();
+    void packInstruction(I &i);
+    void adjustJumpOffsets();
+
+    QVector<I> instructions;
+    QVector<int> labels;
+    ExceptionHandler *currentExceptionHandler;
+    int regCount = 0;
+public:
+    int currentReg = 0;
+private:
+    int startLine = 0;
+    int currentLine = 0;
+    bool debugMode = false;
+};
+
+}
+}
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/qml/compiler/qv4codegen.cpp b/src/qml/compiler/qv4codegen.cpp
index 3fff29bce0..b9d223bab0 100644
--- a/src/qml/compiler/qv4codegen.cpp
+++ b/src/qml/compiler/qv4codegen.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtQml module of the Qt Toolkit.
@@ -39,7 +39,6 @@
 
 #include "qv4codegen_p.h"
 #include "qv4util_p.h"
-#include "qv4engine_p.h"
 
 #include <QtCore/QCoreApplication>
 #include <QtCore/QStringList>
@@ -51,10 +50,10 @@
 #include <private/qqmljsast_p.h>
 #include <private/qv4string_p.h>
 #include <private/qv4value_p.h>
-
-#ifndef V4_BOOTSTRAP
-#include <qv4context_p.h>
-#endif
+#include <private/qv4compilercontext_p.h>
+#include <private/qv4compilercontrolflow_p.h>
+#include <private/qv4bytecodegenerator_p.h>
+#include <private/qv4compilerscanfunctions_p.h>
 
 #include <cmath>
 #include <iostream>
@@ -63,37 +62,13 @@
 #undef CONST
 #endif
 
+QT_USE_NAMESPACE
 using namespace QV4;
-using namespace QQmlJS;
-using namespace AST;
-
-static inline void setLocation(IR::Stmt *s, const SourceLocation &loc)
-{
-    if (s && loc.isValid())
-        s->location = loc;
-}
-
-static bool cjumpCanHandle(IR::AluOp op)
-{
-    switch (op) {
-    case IR::OpIn:
-    case IR::OpInstanceof:
-    case IR::OpEqual:
-    case IR::OpNotEqual:
-    case IR::OpGe:
-    case IR::OpGt:
-    case IR::OpLe:
-    case IR::OpLt:
-    case IR::OpStrictEqual:
-    case IR::OpStrictNotEqual:
-        return true;
-    default:
-        return false;
-    }
-}
+using namespace QV4::Compiler;
+using namespace QQmlJS::AST;
 
-static inline void setJumpOutLocation(IR::Stmt *s, const Statement *body,
-                                      const SourceLocation &fallback)
+static inline void setJumpOutLocation(QV4::Moth::BytecodeGenerator *bytecodeGenerator,
+                                      const Statement *body, const SourceLocation &fallback)
 {
     switch (body->kind) {
     // Statements where we might never execute the last line.
@@ -105,672 +80,170 @@ static inline void setJumpOutLocation(IR::Stmt *s, const Statement *body,
     case Statement::Kind_LocalForEachStatement:
     case Statement::Kind_LocalForStatement:
     case Statement::Kind_WhileStatement:
-        setLocation(s, fallback);
+        bytecodeGenerator->setLocation(fallback);
         break;
     default:
-        setLocation(s, body->lastSourceLocation());
+        bytecodeGenerator->setLocation(body->lastSourceLocation());
         break;
     }
 }
 
-static inline bool isSimpleExpr(IR::Expr *e)
-{
-    switch (e->exprKind) {
-    case IR::Expr::TempExpr:
-    case IR::Expr::ArgLocalExpr:
-    case IR::Expr::ConstExpr:
-        return true;
-    default:
-        return false;
-    }
-}
-
-Codegen::ScanFunctions::ScanFunctions(Codegen *cg, const QString &sourceCode, CompilationMode defaultProgramMode)
-    : _cg(cg)
-    , _sourceCode(sourceCode)
-    , _variableEnvironment(0)
-    , _allowFuncDecls(true)
-    , defaultProgramMode(defaultProgramMode)
-{
-}
-
-void Codegen::ScanFunctions::operator()(Node *node)
-{
-    if (node)
-        node->accept(this);
-}
-
-void Codegen::ScanFunctions::enterEnvironment(Node *node, CompilationMode compilationMode)
-{
-    Environment *e = _cg->newEnvironment(node, _variableEnvironment, compilationMode);
-    if (!e->isStrict)
-        e->isStrict = _cg->_strictMode;
-    _envStack.append(e);
-    _variableEnvironment = e;
-}
-
-void Codegen::ScanFunctions::leaveEnvironment()
-{
-    _envStack.pop();
-    _variableEnvironment = _envStack.isEmpty() ? 0 : _envStack.top();
-}
-
-void Codegen::ScanFunctions::checkDirectivePrologue(SourceElements *ast)
-{
-    for (SourceElements *it = ast; it; it = it->next) {
-        if (StatementSourceElement *stmt = cast<StatementSourceElement *>(it->element)) {
-            if (ExpressionStatement *expr = cast<ExpressionStatement *>(stmt->statement)) {
-                if (StringLiteral *strLit = cast<StringLiteral *>(expr->expression)) {
-                    // Use the source code, because the StringLiteral's
-                    // value might have escape sequences in it, which is not
-                    // allowed.
-                    if (strLit->literalToken.length < 2)
-                        continue;
-                    QStringRef str = _sourceCode.midRef(strLit->literalToken.offset + 1, strLit->literalToken.length - 2);
-                    if (str == QLatin1String("use strict")) {
-                        _variableEnvironment->isStrict = true;
-                    } else {
-                        // TODO: give a warning.
-                    }
-                    continue;
-                }
-            }
-        }
-
-        break;
-    }
-}
-
-void Codegen::ScanFunctions::checkName(const QStringRef &name, const SourceLocation &loc)
-{
-    if (_variableEnvironment->isStrict) {
-        if (name == QLatin1String("implements")
-                || name == QLatin1String("interface")
-                || name == QLatin1String("let")
-                || name == QLatin1String("package")
-                || name == QLatin1String("private")
-                || name == QLatin1String("protected")
-                || name == QLatin1String("public")
-                || name == QLatin1String("static")
-                || name == QLatin1String("yield")) {
-            _cg->throwSyntaxError(loc, QStringLiteral("Unexpected strict mode reserved word"));
-        }
-    }
-}
-void Codegen::ScanFunctions::checkForArguments(AST::FormalParameterList *parameters)
-{
-    while (parameters) {
-        if (parameters->name == QLatin1String("arguments"))
-            _variableEnvironment->usesArgumentsObject = Environment::ArgumentsObjectNotUsed;
-        parameters = parameters->next;
-    }
-}
-
-bool Codegen::ScanFunctions::visit(Program *ast)
-{
-    enterEnvironment(ast, defaultProgramMode);
-    checkDirectivePrologue(ast->elements);
-    return true;
-}
-
-void Codegen::ScanFunctions::endVisit(Program *)
-{
-    leaveEnvironment();
-}
-
-bool Codegen::ScanFunctions::visit(CallExpression *ast)
-{
-    if (! _variableEnvironment->hasDirectEval) {
-        if (IdentifierExpression *id = cast<IdentifierExpression *>(ast->base)) {
-            if (id->name == QLatin1String("eval")) {
-                if (_variableEnvironment->usesArgumentsObject == Environment::ArgumentsObjectUnknown)
-                    _variableEnvironment->usesArgumentsObject = Environment::ArgumentsObjectUsed;
-                _variableEnvironment->hasDirectEval = true;
-            }
-        }
-    }
-    int argc = 0;
-    for (ArgumentList *it = ast->arguments; it; it = it->next)
-        ++argc;
-    _variableEnvironment->maxNumberOfArguments = qMax(_variableEnvironment->maxNumberOfArguments, argc);
-    return true;
-}
-
-bool Codegen::ScanFunctions::visit(NewMemberExpression *ast)
-{
-    int argc = 0;
-    for (ArgumentList *it = ast->arguments; it; it = it->next)
-        ++argc;
-    _variableEnvironment->maxNumberOfArguments = qMax(_variableEnvironment->maxNumberOfArguments, argc);
-    return true;
-}
-
-bool Codegen::ScanFunctions::visit(ArrayLiteral *ast)
-{
-    int index = 0;
-    for (ElementList *it = ast->elements; it; it = it->next) {
-        for (Elision *elision = it->elision; elision; elision = elision->next)
-            ++index;
-        ++index;
-    }
-    if (ast->elision) {
-        for (Elision *elision = ast->elision->next; elision; elision = elision->next)
-            ++index;
-    }
-    _variableEnvironment->maxNumberOfArguments = qMax(_variableEnvironment->maxNumberOfArguments, index);
-    return true;
-}
-
-bool Codegen::ScanFunctions::visit(VariableDeclaration *ast)
-{
-    if (_variableEnvironment->isStrict && (ast->name == QLatin1String("eval") || ast->name == QLatin1String("arguments")))
-        _cg->throwSyntaxError(ast->identifierToken, QStringLiteral("Variable name may not be eval or arguments in strict mode"));
-    checkName(ast->name, ast->identifierToken);
-    if (ast->name == QLatin1String("arguments"))
-        _variableEnvironment->usesArgumentsObject = Environment::ArgumentsObjectNotUsed;
-    if (ast->scope == AST::VariableDeclaration::VariableScope::ReadOnlyBlockScope && !ast->expression) {
-        _cg->throwSyntaxError(ast->identifierToken, QStringLiteral("Missing initializer in const declaration"));
-        return false;
-    }
-    QString name = ast->name.toString();
-    const Environment::Member *m = 0;
-    if (_variableEnvironment->memberInfo(name, &m)) {
-        if (m->isLexicallyScoped() || ast->isLexicallyScoped()) {
-            _cg->throwSyntaxError(ast->identifierToken, QStringLiteral("Identifier %1 has already been declared").arg(name));
-            return false;
-        }
-    }
-    _variableEnvironment->enter(ast->name.toString(), ast->expression ? Environment::VariableDefinition : Environment::VariableDeclaration, ast->scope);
-    return true;
-}
-
-bool Codegen::ScanFunctions::visit(IdentifierExpression *ast)
-{
-    checkName(ast->name, ast->identifierToken);
-    if (_variableEnvironment->usesArgumentsObject == Environment::ArgumentsObjectUnknown && ast->name == QLatin1String("arguments"))
-        _variableEnvironment->usesArgumentsObject = Environment::ArgumentsObjectUsed;
-    return true;
-}
-
-bool Codegen::ScanFunctions::visit(ExpressionStatement *ast)
-{
-    if (FunctionExpression* expr = AST::cast<AST::FunctionExpression*>(ast->expression)) {
-        if (!_allowFuncDecls)
-            _cg->throwSyntaxError(expr->functionToken, QStringLiteral("conditional function or closure declaration"));
-
-        enterFunction(expr, /*enterName*/ true);
-        Node::accept(expr->formals, this);
-        Node::accept(expr->body, this);
-        leaveEnvironment();
-        return false;
-    } else {
-        SourceLocation firstToken = ast->firstSourceLocation();
-        if (_sourceCode.midRef(firstToken.offset, firstToken.length) == QLatin1String("function")) {
-            _cg->throwSyntaxError(firstToken, QStringLiteral("unexpected token"));
-        }
-    }
-    return true;
-}
-
-bool Codegen::ScanFunctions::visit(FunctionExpression *ast)
-{
-    enterFunction(ast, /*enterName*/ false);
-    return true;
-}
-
-void Codegen::ScanFunctions::enterFunction(FunctionExpression *ast, bool enterName, bool isExpression)
-{
-    if (_variableEnvironment->isStrict && (ast->name == QLatin1String("eval") || ast->name == QLatin1String("arguments")))
-        _cg->throwSyntaxError(ast->identifierToken, QStringLiteral("Function name may not be eval or arguments in strict mode"));
-    enterFunction(ast, ast->name.toString(), ast->formals, ast->body, enterName ? ast : 0, isExpression);
-}
-
-void Codegen::ScanFunctions::endVisit(FunctionExpression *)
-{
-    leaveEnvironment();
-}
-
-bool Codegen::ScanFunctions::visit(ObjectLiteral *ast)
-{
-    int argc = 0;
-    for (PropertyAssignmentList *it = ast->properties; it; it = it->next) {
-        QString key = it->assignment->name->asString();
-        if (QV4::String::toArrayIndex(key) != UINT_MAX)
-            ++argc;
-        ++argc;
-        if (AST::cast<AST::PropertyGetterSetter *>(it->assignment))
-            ++argc;
-    }
-    _variableEnvironment->maxNumberOfArguments = qMax(_variableEnvironment->maxNumberOfArguments, argc);
-
-    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, true);
-    Node::accept(ast->properties, this);
-    return false;
-}
-
-bool Codegen::ScanFunctions::visit(PropertyGetterSetter *ast)
-{
-    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, true);
-    enterFunction(ast, QString(), ast->formals, ast->functionBody, /*FunctionExpression*/0, /*isExpression*/false);
-    return true;
-}
-
-void Codegen::ScanFunctions::endVisit(PropertyGetterSetter *)
-{
-    leaveEnvironment();
-}
-
-bool Codegen::ScanFunctions::visit(FunctionDeclaration *ast)
-{
-    enterFunction(ast, /*enterName*/ true, /*isExpression */false);
-    return true;
-}
-
-void Codegen::ScanFunctions::endVisit(FunctionDeclaration *)
-{
-    leaveEnvironment();
-}
-
-bool Codegen::ScanFunctions::visit(WithStatement *ast)
-{
-    if (_variableEnvironment->isStrict) {
-        _cg->throwSyntaxError(ast->withToken, QStringLiteral("'with' statement is not allowed in strict mode"));
-        return false;
-    }
-
-    return true;
-}
-
-bool Codegen::ScanFunctions::visit(DoWhileStatement *ast) {
-    {
-        TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, !_variableEnvironment->isStrict);
-        Node::accept(ast->statement, this);
-    }
-    Node::accept(ast->expression, this);
-    return false;
-}
-
-bool Codegen::ScanFunctions::visit(ForStatement *ast) {
-    Node::accept(ast->initialiser, this);
-    Node::accept(ast->condition, this);
-    Node::accept(ast->expression, this);
-
-    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, !_variableEnvironment->isStrict);
-    Node::accept(ast->statement, this);
-
-    return false;
-}
-
-bool Codegen::ScanFunctions::visit(LocalForStatement *ast) {
-    Node::accept(ast->declarations, this);
-    Node::accept(ast->condition, this);
-    Node::accept(ast->expression, this);
-
-    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, !_variableEnvironment->isStrict);
-    Node::accept(ast->statement, this);
-
-    return false;
-}
-
-bool Codegen::ScanFunctions::visit(ForEachStatement *ast) {
-    Node::accept(ast->initialiser, this);
-    Node::accept(ast->expression, this);
-
-    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, !_variableEnvironment->isStrict);
-    Node::accept(ast->statement, this);
-
-    return false;
-}
-
-bool Codegen::ScanFunctions::visit(LocalForEachStatement *ast) {
-    Node::accept(ast->declaration, this);
-    Node::accept(ast->expression, this);
-
-    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, !_variableEnvironment->isStrict);
-    Node::accept(ast->statement, this);
-
-    return false;
-}
-
-bool Codegen::ScanFunctions::visit(ThisExpression *)
-{
-    _variableEnvironment->usesThis = true;
-    return false;
-}
-
-bool Codegen::ScanFunctions::visit(Block *ast) {
-    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, _variableEnvironment->isStrict ? false : _allowFuncDecls);
-    Node::accept(ast->statements, this);
-    return false;
-}
-
-void Codegen::ScanFunctions::enterFunction(Node *ast, const QString &name, FormalParameterList *formals, FunctionBody *body, FunctionExpression *expr, bool isExpression)
-{
-    bool wasStrict = false;
-    if (_variableEnvironment) {
-        _variableEnvironment->hasNestedFunctions = true;
-        // The identifier of a function expression cannot be referenced from the enclosing environment.
-        if (expr)
-            _variableEnvironment->enter(name, Environment::FunctionDefinition, AST::VariableDeclaration::FunctionScope, expr);
-        if (name == QLatin1String("arguments"))
-            _variableEnvironment->usesArgumentsObject = Environment::ArgumentsObjectNotUsed;
-        wasStrict = _variableEnvironment->isStrict;
-    }
-
-    enterEnvironment(ast, FunctionCode);
-    checkForArguments(formals);
-
-    _variableEnvironment->isNamedFunctionExpression = isExpression && !name.isEmpty();
-    _variableEnvironment->formals = formals;
-
-    if (body)
-        checkDirectivePrologue(body->elements);
-
-    if (wasStrict || _variableEnvironment->isStrict) {
-        QStringList args;
-        for (FormalParameterList *it = formals; it; it = it->next) {
-            QString arg = it->name.toString();
-            if (args.contains(arg)) {
-                _cg->throwSyntaxError(it->identifierToken, QStringLiteral("Duplicate parameter name '%1' is not allowed in strict mode").arg(arg));
-                return;
-            }
-            if (arg == QLatin1String("eval") || arg == QLatin1String("arguments")) {
-                _cg->throwSyntaxError(it->identifierToken, QStringLiteral("'%1' cannot be used as parameter name in strict mode").arg(arg));
-                return;
-            }
-            args += arg;
-        }
-    }
-}
-
-
-Codegen::Codegen(bool strict)
+Codegen::Codegen(QV4::Compiler::JSUnitGenerator *jsUnitGenerator, bool strict)
     : _module(0)
-    , _function(0)
-    , _block(0)
-    , _exitBlock(0)
     , _returnAddress(0)
-    , _variableEnvironment(0)
-    , _loop(0)
+    , _context(0)
     , _labelledStatement(0)
-    , _scopeAndFinally(0)
+    , jsUnitGenerator(jsUnitGenerator)
     , _strictMode(strict)
     , _fileNameIsUrl(false)
     , hasError(false)
 {
+    jsUnitGenerator->codeGeneratorName = QStringLiteral("moth");
 }
 
 void Codegen::generateFromProgram(const QString &fileName,
                                   const QString &sourceCode,
                                   Program *node,
-                                  QV4::IR::Module *module,
-                                  CompilationMode mode,
-                                  const QStringList &inheritedLocals)
+                                  Module *module,
+                                  CompilationMode mode)
 {
     Q_ASSERT(node);
 
     _module = module;
-    _variableEnvironment = 0;
+    _context = 0;
 
-    _module->setFileName(fileName);
+    _module->fileName = fileName;
 
     ScanFunctions scan(this, sourceCode, mode);
     scan(node);
 
-    defineFunction(QStringLiteral("%entry"), node, 0, node->elements, inheritedLocals);
-    qDeleteAll(_envMap);
-    _envMap.clear();
-}
-
-void Codegen::generateFromFunctionExpression(const QString &fileName,
-                                             const QString &sourceCode,
-                                             AST::FunctionExpression *ast,
-                                             QV4::IR::Module *module)
-{
-    _module = module;
-    _module->setFileName(fileName);
-    _variableEnvironment = 0;
-
-    ScanFunctions scan(this, sourceCode, GlobalCode);
-    // fake a global environment
-    scan.enterEnvironment(0, FunctionCode);
-    scan(ast);
-    scan.leaveEnvironment();
-
-    defineFunction(ast->name.toString(), ast, ast->formals, ast->body ? ast->body->elements : 0);
-
-    qDeleteAll(_envMap);
-    _envMap.clear();
-}
-
-
-void Codegen::enterEnvironment(Node *node)
-{
-    _variableEnvironment = _envMap.value(node);
-    Q_ASSERT(_variableEnvironment);
-}
-
-void Codegen::leaveEnvironment()
-{
-    Q_ASSERT(_variableEnvironment);
-    _variableEnvironment = _variableEnvironment->parent;
-}
-
-void Codegen::enterLoop(Statement *node, IR::BasicBlock *breakBlock, IR::BasicBlock *continueBlock)
-{
-    _loop = new Loop(node, breakBlock, continueBlock, _loop);
-    _loop->labelledStatement = _labelledStatement; // consume the enclosing labelled statement
-    _loop->scopeAndFinally = _scopeAndFinally;
-    _labelledStatement = 0;
-}
-
-void Codegen::leaveLoop()
-{
-    Loop *current = _loop;
-    _loop = _loop->parent;
-    delete current;
-}
-
-IR::Expr *Codegen::member(IR::Expr *base, const QString *name)
-{
-    if (hasError)
-        return 0;
-
-    if (base->asTemp() || base->asArgLocal())
-        return _block->MEMBER(base, name);
-    else {
-        const unsigned t = _block->newTemp();
-        move(_block->TEMP(t), base);
-        return _block->MEMBER(_block->TEMP(t), name);
-    }
+    defineFunction(QStringLiteral("%entry"), node, 0, node->elements);
 }
 
-IR::Expr *Codegen::argument(IR::Expr *expr)
+void Codegen::enterContext(Node *node)
 {
-    if (expr && !expr->asTemp()) {
-        const unsigned t = _block->newTemp();
-        move(_block->TEMP(t), expr);
-        expr = _block->TEMP(t);
-    }
-    return expr;
+    _context = _module->contextMap.value(node);
+    Q_ASSERT(_context);
 }
 
-// keeps references alive, converts other expressions to temps
-IR::Expr *Codegen::reference(IR::Expr *expr)
+int Codegen::leaveContext()
 {
-    if (hasError)
-        return 0;
-
-    if (expr && !expr->asTemp() && !expr->asArgLocal() && !expr->asName() && !expr->asMember() && !expr->asSubscript()) {
-        const unsigned t = _block->newTemp();
-        move(_block->TEMP(t), expr);
-        expr = _block->TEMP(t);
-    }
-    return expr;
+    Q_ASSERT(_context);
+    Q_ASSERT(!_context->controlFlow);
+    int functionIndex = _context->functionIndex;
+    _context = _context->parent;
+    return functionIndex;
 }
 
-IR::Expr *Codegen::unop(IR::AluOp op, IR::Expr *expr, const SourceLocation &loc)
+Codegen::Reference Codegen::unop(UnaryOperation op, const Reference &expr)
 {
     if (hasError)
-        return 0;
-
-    Q_ASSERT(op != IR::OpIncrement);
-    Q_ASSERT(op != IR::OpDecrement);
+        return _expr.result();
 
-    if (IR::Const *c = expr->asConst()) {
-        if (c->type == IR::NumberType) {
+#ifndef V4_BOOTSTRAP
+    if (expr.isConst()) {
+        auto v = Value::fromReturnedValue(expr.constant);
+        if (v.isNumber()) {
             switch (op) {
-            case IR::OpNot:
-                return _block->CONST(IR::BoolType, !c->value);
-            case IR::OpUMinus:
-                return _block->CONST(IR::NumberType, -c->value);
-            case IR::OpUPlus:
+            case Not:
+                return Reference::fromConst(this, Encode(!v.toBoolean()));
+            case UMinus:
+                return Reference::fromConst(this, Runtime::method_uMinus(v));
+            case UPlus:
                 return expr;
-            case IR::OpCompl:
-                return _block->CONST(IR::NumberType, ~QV4::Primitive::toInt32(c->value));
-            case IR::OpIncrement:
-                return _block->CONST(IR::NumberType, c->value + 1);
-            case IR::OpDecrement:
-                return _block->CONST(IR::NumberType, c->value - 1);
+            case Compl:
+                return Reference::fromConst(this, Encode((int)~v.toInt32()));
             default:
                 break;
             }
         }
     }
+#endif // V4_BOOTSTRAP
 
-    TempScope scope(_function);
-    if (isSimpleExpr(expr))
-        return _block->UNOP(op, expr);
-
-    const unsigned t = _block->newTemp();
-    setLocation(move(_block->TEMP(t), expr), loc);
-    expr = _block->TEMP(t);
-    return _block->UNOP(op, expr);
-}
-
-IR::Expr *Codegen::binop(IR::AluOp op, IR::Expr *left, IR::Expr *right, const AST::SourceLocation &loc)
-{
-    if (hasError)
-        return 0;
-
-    TempScope scope(_function);
-
-    if (IR::Const *c1 = left->asConst()) {
-        if (IR::Const *c2 = right->asConst()) {
-            if ((c1->type & IR::NumberType) && (c2->type & IR::NumberType)) {
-                switch (op) {
-                case IR::OpAdd: return _block->CONST(IR::NumberType, c1->value + c2->value);
-                case IR::OpAnd: return _block->CONST(IR::BoolType, c1->value ? c2->value : 0);
-                case IR::OpBitAnd: return _block->CONST(IR::NumberType, int(c1->value) & int(c2->value));
-                case IR::OpBitOr: return _block->CONST(IR::NumberType, int(c1->value) | int(c2->value));
-                case IR::OpBitXor: return _block->CONST(IR::NumberType, int(c1->value) ^ int(c2->value));
-                case IR::OpDiv: return _block->CONST(IR::NumberType, c1->value / c2->value);
-                case IR::OpEqual: return _block->CONST(IR::BoolType, c1->value == c2->value);
-                case IR::OpNotEqual: return _block->CONST(IR::BoolType, c1->value != c2->value);
-                case IR::OpStrictEqual: return _block->CONST(IR::BoolType, c1->value == c2->value);
-                case IR::OpStrictNotEqual: return _block->CONST(IR::BoolType, c1->value != c2->value);
-                case IR::OpGe: return _block->CONST(IR::BoolType, c1->value >= c2->value);
-                case IR::OpGt: return _block->CONST(IR::BoolType, c1->value > c2->value);
-                case IR::OpLe: return _block->CONST(IR::BoolType, c1->value <= c2->value);
-                case IR::OpLt: return _block->CONST(IR::BoolType, c1->value < c2->value);
-                case IR::OpLShift: return _block->CONST(IR::NumberType, QV4::Primitive::toInt32(c1->value) << (QV4::Primitive::toUInt32(c2->value) & 0x1f));
-                case IR::OpMod: return _block->CONST(IR::NumberType, std::fmod(c1->value, c2->value));
-                case IR::OpMul: return _block->CONST(IR::NumberType, c1->value * c2->value);
-                case IR::OpOr: return _block->CONST(IR::NumberType, c1->value ? c1->value : c2->value);
-                case IR::OpRShift: return _block->CONST(IR::NumberType, QV4::Primitive::toInt32(c1->value) >> (QV4::Primitive::toUInt32(c2->value) & 0x1f));
-                case IR::OpSub: return _block->CONST(IR::NumberType, c1->value - c2->value);
-                case IR::OpURShift: return _block->CONST(IR::NumberType,QV4::Primitive::toUInt32(c1->value) >> (QV4::Primitive::toUInt32(c2->value) & 0x1f));
-
-                case IR::OpInstanceof:
-                case IR::OpIn:
-                    break;
-
-                case IR::OpIfTrue: // unary ops
-                case IR::OpNot:
-                case IR::OpUMinus:
-                case IR::OpUPlus:
-                case IR::OpCompl:
-                case IR::OpIncrement:
-                case IR::OpDecrement:
-                case IR::OpInvalid:
-                    break;
-                }
-            }
+    switch (op) {
+    case UMinus: {
+        expr.loadInAccumulator();
+        Instruction::UMinus uminus;
+        bytecodeGenerator->addInstruction(uminus);
+        return Reference::fromAccumulator(this);
+    }
+    case UPlus: {
+        expr.loadInAccumulator();
+        Instruction::UPlus uplus;
+        bytecodeGenerator->addInstruction(uplus);
+        return Reference::fromAccumulator(this);
+    }
+    case Not: {
+        expr.loadInAccumulator();
+        Instruction::UNot unot;
+        bytecodeGenerator->addInstruction(unot);
+        return Reference::fromAccumulator(this);
+    }
+    case Compl: {
+        expr.loadInAccumulator();
+        Instruction::UCompl ucompl;
+        bytecodeGenerator->addInstruction(ucompl);
+        return Reference::fromAccumulator(this);
+    }
+    case PostIncrement:
+        if (!_expr.accept(nx) || requiresReturnValue) {
+            Reference e = expr.asLValue();
+            e.loadInAccumulator();
+            Instruction::UPlus uplus;
+            bytecodeGenerator->addInstruction(uplus);
+            Reference originalValue = Reference::fromStackSlot(this).storeRetainAccumulator();
+            Instruction::Increment inc;
+            bytecodeGenerator->addInstruction(inc);
+            e.storeConsumeAccumulator();
+            return originalValue;
+        } else {
+            // intentionally fall-through: the result is never used, so it's equivalent to
+            // "expr += 1", which is what a pre-increment does as well.
         }
-    } else if (op == IR::OpAdd) {
-        if (IR::String *s1 = left->asString()) {
-            if (IR::String *s2 = right->asString()) {
-                return _block->STRING(_function->newString(*s1->value + *s2->value));
-            }
+    case PreIncrement: {
+        Reference e = expr.asLValue();
+        e.loadInAccumulator();
+        Instruction::Increment inc;
+        bytecodeGenerator->addInstruction(inc);
+        if (_expr.accept(nx))
+            return e.storeConsumeAccumulator();
+        else
+            return e.storeRetainAccumulator();
+    }
+    case PostDecrement:
+        if (!_expr.accept(nx) || requiresReturnValue) {
+            Reference e = expr.asLValue();
+            e.loadInAccumulator();
+            Instruction::UPlus uplus;
+            bytecodeGenerator->addInstruction(uplus);
+            Reference originalValue = Reference::fromStackSlot(this).storeRetainAccumulator();
+            Instruction::Decrement dec;
+            bytecodeGenerator->addInstruction(dec);
+            e.storeConsumeAccumulator();
+            return originalValue;
+        } else {
+            // intentionally fall-through: the result is never used, so it's equivalent to
+            // "expr -= 1", which is what a pre-decrement does as well.
         }
+    case PreDecrement: {
+        Reference e = expr.asLValue();
+        e.loadInAccumulator();
+        Instruction::Decrement dec;
+        bytecodeGenerator->addInstruction(dec);
+        if (_expr.accept(nx))
+            return e.storeConsumeAccumulator();
+        else
+            return e.storeRetainAccumulator();
     }
-
-    if (!left->asTemp() && !left->asArgLocal() && !left->asConst()) {
-        const unsigned t = _block->newTemp();
-        setLocation(move(_block->TEMP(t), left), loc);
-        left = _block->TEMP(t);
-    }
-
-    if (!right->asTemp() && !right->asArgLocal() && !right->asConst()) {
-        const unsigned t = _block->newTemp();
-        setLocation(move(_block->TEMP(t), right), loc);
-        right = _block->TEMP(t);
-    }
-
-    Q_ASSERT(left->asTemp() || left->asArgLocal() || left->asConst());
-    Q_ASSERT(right->asTemp() || right->asArgLocal() || right->asConst());
-
-    return _block->BINOP(op, left, right);
-}
-
-IR::Expr *Codegen::call(IR::Expr *base, IR::ExprList *args)
-{
-    if (hasError)
-        return 0;
-    base = reference(base);
-    return _block->CALL(base, args);
-}
-
-IR::Stmt *Codegen::move(IR::Expr *target, IR::Expr *source, IR::AluOp op)
-{
-    if (hasError)
-        return 0;
-
-    Q_ASSERT(target->isLValue());
-
-    if (op != IR::OpInvalid) {
-        return move(target, binop(op, target, source));
-    }
-
-    TempScope scope(_function);
-
-    if (!source->asTemp() && !source->asConst() && !target->asTemp() && !source->asArgLocal() && !target->asArgLocal()) {
-        unsigned t = _block->newTemp();
-        _block->MOVE(_block->TEMP(t), source);
-        source = _block->TEMP(t);
-    }
-    if (source->asConst() && !target->asTemp() && !target->asArgLocal()) {
-        unsigned t = _block->newTemp();
-        _block->MOVE(_block->TEMP(t), source);
-        source = _block->TEMP(t);
     }
 
-    return _block->MOVE(target, source);
+    Q_UNREACHABLE();
 }
 
-IR::Stmt *Codegen::cjump(IR::Expr *cond, IR::BasicBlock *iftrue, IR::BasicBlock *iffalse)
+void Codegen::addCJump()
 {
-    if (hasError)
-        return 0;
-
-    TempScope scope(_function);
-
-    if (! (cond->asTemp() || (cond->asBinop() && cjumpCanHandle(cond->asBinop()->op)) )) {
-        const unsigned t = _block->newTemp();
-        move(_block->TEMP(t), cond);
-        cond = _block->TEMP(t);
-    }
-    return _block->CJUMP(cond, iftrue, iffalse);
+    bytecodeGenerator->addCJumpInstruction(_expr.trueBlockFollowsCondition(),
+                                           _expr.iftrue(), _expr.iffalse());
 }
 
 void Codegen::accept(Node *node)
@@ -784,52 +257,71 @@ void Codegen::accept(Node *node)
 
 void Codegen::statement(Statement *ast)
 {
-    TempScope scope(_function);
+    RegisterScope scope(this);
+
+    bytecodeGenerator->setLocation(ast->firstSourceLocation());
 
-    _block->nextLocation = ast->firstSourceLocation();
+    VolatileMemoryLocations vLocs = scanVolatileMemoryLocations(ast);
+    qSwap(_volataleMemoryLocations, vLocs);
     accept(ast);
+    qSwap(_volataleMemoryLocations, vLocs);
 }
 
 void Codegen::statement(ExpressionNode *ast)
 {
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
     if (! ast) {
         return;
     } else {
         Result r(nx);
         qSwap(_expr, r);
+        VolatileMemoryLocations vLocs = scanVolatileMemoryLocations(ast);
+        qSwap(_volataleMemoryLocations, vLocs);
+
         accept(ast);
+
+        qSwap(_volataleMemoryLocations, vLocs);
+        qSwap(_expr, r);
+
         if (hasError)
             return;
-        qSwap(_expr, r);
-        if (r.format == ex) {
-            if (r->asCall()) {
-                _block->EXP(*r); // the nest nx representation for calls is EXP(CALL(c..))
-            } else if (r->asTemp() || r->asArgLocal()) {
-                // there is nothing to do
-            } else {
-                unsigned t = _block->newTemp();
-                move(_block->TEMP(t), *r);
-            }
-        }
+        if (r.result().loadTriggersSideEffect())
+            r.result().loadInAccumulator(); // triggers side effects
     }
 }
 
-void Codegen::condition(ExpressionNode *ast, IR::BasicBlock *iftrue, IR::BasicBlock *iffalse)
+void Codegen::condition(ExpressionNode *ast, const BytecodeGenerator::Label *iftrue,
+                        const BytecodeGenerator::Label *iffalse, bool trueBlockFollowsCondition)
 {
-    if (ast) {
-        Result r(iftrue, iffalse);
-        qSwap(_expr, r);
-        accept(ast);
-        qSwap(_expr, r);
-        if (r.format == ex) {
-            setLocation(cjump(*r, r.iftrue, r.iffalse), ast->firstSourceLocation());
-        }
+    if (hasError)
+        return;
+
+    if (!ast)
+        return;
+
+    Result r(iftrue, iffalse, trueBlockFollowsCondition);
+    qSwap(_expr, r);
+    accept(ast);
+    qSwap(_expr, r);
+
+    if (hasError)
+        return;
+
+    if (r.format() == ex) {
+        Q_ASSERT(iftrue == r.iftrue());
+        Q_ASSERT(iffalse == r.iffalse());
+        Q_ASSERT(r.result().isValid());
+        bytecodeGenerator->setLocation(ast->firstSourceLocation());
+        r.result().loadInAccumulator();
+        if (r.trueBlockFollowsCondition())
+            bytecodeGenerator->jumpFalse().link(*r.iffalse());
+        else
+            bytecodeGenerator->jumpTrue().link(*r.iftrue());
     }
 }
 
-Codegen::Result Codegen::expression(ExpressionNode *ast)
+Codegen::Reference Codegen::expression(ExpressionNode *ast)
 {
     Result r;
     if (ast) {
@@ -837,7 +329,7 @@ Codegen::Result Codegen::expression(ExpressionNode *ast)
         accept(ast);
         qSwap(_expr, r);
     }
-    return r;
+    return r.result();
 }
 
 Codegen::Result Codegen::sourceElement(SourceElement *ast)
@@ -851,17 +343,6 @@ Codegen::Result Codegen::sourceElement(SourceElement *ast)
     return r;
 }
 
-Codegen::UiMember Codegen::uiObjectMember(UiObjectMember *ast)
-{
-    UiMember m;
-    if (ast) {
-        qSwap(_uiMember, m);
-        accept(ast);
-        qSwap(_uiMember, m);
-    }
-    return m;
-}
-
 void Codegen::functionBody(FunctionBody *ast)
 {
     if (ast)
@@ -877,36 +358,58 @@ void Codegen::program(Program *ast)
 
 void Codegen::sourceElements(SourceElements *ast)
 {
+    bool _requiresReturnValue = false;
+    qSwap(_requiresReturnValue, requiresReturnValue);
     for (SourceElements *it = ast; it; it = it->next) {
+        if (!it->next)
+            qSwap(_requiresReturnValue, requiresReturnValue);
         sourceElement(it->element);
         if (hasError)
             return;
+        if (StatementSourceElement *sse = AST::cast<StatementSourceElement *>(it->element)) {
+            if (AST::cast<ThrowStatement *>(sse->statement) ||
+                    AST::cast<ReturnStatement *>(sse->statement))
+                return;
+        }
+    }
+}
+
+void Codegen::statementList(StatementList *ast)
+{
+    bool _requiresReturnValue = requiresReturnValue;
+    requiresReturnValue = false;
+    for (StatementList *it = ast; it; it = it->next) {
+        if (!it->next ||
+            it->next->statement->kind == Statement::Kind_BreakStatement ||
+            it->next->statement->kind == Statement::Kind_ContinueStatement ||
+            it->next->statement->kind == Statement::Kind_ReturnStatement)
+                requiresReturnValue = _requiresReturnValue;
+        statement(it->statement);
+        requiresReturnValue = false;
+        if (it->statement->kind == Statement::Kind_ThrowStatement ||
+            it->statement->kind == Statement::Kind_BreakStatement ||
+            it->statement->kind == Statement::Kind_ContinueStatement ||
+            it->statement->kind == Statement::Kind_ReturnStatement)
+            // any code after those statements is unreachable
+            break;
     }
+    requiresReturnValue = _requiresReturnValue;
 }
 
 void Codegen::variableDeclaration(VariableDeclaration *ast)
 {
-    IR::Expr *initializer = 0;
+    RegisterScope scope(this);
+
     if (!ast->expression)
         return;
-    Result expr = expression(ast->expression);
+    Reference rhs = expression(ast->expression);
     if (hasError)
         return;
 
-    Q_ASSERT(expr.code);
-    initializer = *expr;
-
-    IR::Expr *lhs = identifier(ast->name.toString(), ast->identifierToken.startLine,
-                               ast->identifierToken.startColumn);
-
-    if (lhs->asArgLocal()) {
-        move(lhs, initializer);
-    } else {
-        TempScope scope(_function);
-        int initialized = _block->newTemp();
-        move(_block->TEMP(initialized), initializer);
-        move(lhs, _block->TEMP(initialized));
-    }
+    Reference lhs = referenceForName(ast->name.toString(), true);
+    //### if lhs is a temp, this won't generate a temp-to-temp move. Same for when rhs is a const
+    rhs.loadInAccumulator();
+    lhs.storeConsumeAccumulator();
 }
 
 void Codegen::variableDeclarationList(VariableDeclarationList *ast)
@@ -919,175 +422,175 @@ void Codegen::variableDeclarationList(VariableDeclarationList *ast)
 
 bool Codegen::visit(ArgumentList *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(CaseBlock *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(CaseClause *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(CaseClauses *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(Catch *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(DefaultClause *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(ElementList *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(Elision *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(Finally *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(FormalParameterList *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(FunctionBody *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(Program *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(PropertyAssignmentList *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(PropertyNameAndValue *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(PropertyGetterSetter *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(SourceElements *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(StatementList *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(UiArrayMemberList *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(UiImport *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(UiHeaderItemList *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(UiPragma *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(UiObjectInitializer *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(UiObjectMemberList *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(UiParameterList *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(UiProgram *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(UiQualifiedId *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(UiQualifiedPragmaId *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(VariableDeclaration *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
 bool Codegen::visit(VariableDeclarationList *)
 {
-    Q_ASSERT(!"unreachable");
+    Q_UNREACHABLE();
     return false;
 }
 
@@ -1106,57 +609,47 @@ bool Codegen::visit(ArrayLiteral *ast)
     if (hasError)
         return false;
 
-    const unsigned t = _block->newTemp();
+    RegisterScope scope(this);
 
-    TempScope scope(_function);
+    int argc = 0;
+    int args = -1;
+    auto push = [this, &argc, &args](AST::ExpressionNode *arg) {
+        int temp = bytecodeGenerator->newRegister();
+        if (args == -1)
+            args = temp;
+        if (!arg) {
+            auto c = Reference::fromConst(this, Primitive::emptyValue().asReturnedValue());
+            (void) c.storeOnStack(temp);
+        } else {
+            RegisterScope scope(this);
+            (void) expression(arg).storeOnStack(temp);
+        }
+        ++argc;
+    };
 
-    IR::ExprList *args = 0;
-    IR::ExprList *current = 0;
     for (ElementList *it = ast->elements; it; it = it->next) {
-        for (Elision *elision = it->elision; elision; elision = elision->next) {
-            IR::ExprList *arg = _function->New<IR::ExprList>();
-            if (!current) {
-                args = arg;
-            } else {
-                current->next = arg;
-            }
-            current = arg;
-            current->expr = _block->CONST(IR::MissingType, 0);
-        }
-        Result expr = expression(it->expression);
-        if (hasError)
-            return false;
 
-        IR::ExprList *arg = _function->New<IR::ExprList>();
-        if (!current) {
-            args = arg;
-        } else {
-            current->next = arg;
-        }
-        current = arg;
+        for (Elision *elision = it->elision; elision; elision = elision->next)
+            push(0);
 
-        IR::Expr *exp = *expr;
-        if (exp->asTemp() || expr->asArgLocal() || exp->asConst()) {
-            current->expr = exp;
-        } else {
-            unsigned value = _block->newTemp();
-            move(_block->TEMP(value), exp);
-            current->expr = _block->TEMP(value);
-        }
+        push(it->expression);
+        if (hasError)
+            return false;
     }
-    for (Elision *elision = ast->elision; elision; elision = elision->next) {
-        IR::ExprList *arg = _function->New<IR::ExprList>();
-        if (!current) {
-            args = arg;
-        } else {
-            current->next = arg;
-        }
-        current = arg;
-        current->expr = _block->CONST(IR::MissingType, 0);
+    for (Elision *elision = ast->elision; elision; elision = elision->next)
+        push(0);
+
+    if (args == -1) {
+        Q_ASSERT(argc == 0);
+        args = 0;
     }
 
-    move(_block->TEMP(t), _block->CALL(_block->NAME(IR::Name::builtin_define_array, 0, 0), args));
-    _expr.code = _block->TEMP(t);
+    Instruction::DefineArray call;
+    call.argc = argc;
+    call.args = Moth::StackSlot::createRegister(args);
+    bytecodeGenerator->addInstruction(call);
+    _expr.setResult(Reference::fromAccumulator(this));
+
     return false;
 }
 
@@ -1165,43 +658,41 @@ bool Codegen::visit(ArrayMemberExpression *ast)
     if (hasError)
         return false;
 
-    IR::Expr *base = *expression(ast->base);
+    Reference base = expression(ast->base);
     if (hasError)
         return false;
-    if (!isSimpleExpr(base)) {
-        const unsigned t = _block->newTemp();
-        move(_block->TEMP(t), base);
-        base = _block->TEMP(t);
-    }
-
-    IR::Expr *index = *expression(ast->expression);
-    if (hasError)
+    base = base.storeOnStack();
+    if (AST::StringLiteral *str = AST::cast<AST::StringLiteral *>(ast->expression)) {
+        QString s = str->value.toString();
+        uint arrayIndex = QV4::String::toArrayIndex(s);
+        if (arrayIndex == UINT_MAX) {
+            _expr.setResult(Reference::fromMember(base, str->value.toString()));
+            return false;
+        }
+        Reference index = Reference::fromConst(this, QV4::Encode(arrayIndex));
+        _expr.setResult(Reference::fromSubscript(base, index));
         return false;
-    if (!isSimpleExpr(index)) {
-        const unsigned t = _block->newTemp();
-        move(_block->TEMP(t), index);
-        index = _block->TEMP(t);
     }
-
-    _expr.code = _block->SUBSCRIPT(base, index);
+    Reference index = expression(ast->expression);
+    _expr.setResult(Reference::fromSubscript(base, index));
     return false;
 }
 
-static IR::AluOp baseOp(int op)
+static QSOperator::Op baseOp(int op)
 {
     switch ((QSOperator::Op) op) {
-    case QSOperator::InplaceAnd: return IR::OpBitAnd;
-    case QSOperator::InplaceSub: return IR::OpSub;
-    case QSOperator::InplaceDiv: return IR::OpDiv;
-    case QSOperator::InplaceAdd: return IR::OpAdd;
-    case QSOperator::InplaceLeftShift: return IR::OpLShift;
-    case QSOperator::InplaceMod: return IR::OpMod;
-    case QSOperator::InplaceMul: return IR::OpMul;
-    case QSOperator::InplaceOr: return IR::OpBitOr;
-    case QSOperator::InplaceRightShift: return IR::OpRShift;
-    case QSOperator::InplaceURightShift: return IR::OpURShift;
-    case QSOperator::InplaceXor: return IR::OpBitXor;
-    default: return IR::OpInvalid;
+    case QSOperator::InplaceAnd: return QSOperator::BitAnd;
+    case QSOperator::InplaceSub: return QSOperator::Sub;
+    case QSOperator::InplaceDiv: return QSOperator::Div;
+    case QSOperator::InplaceAdd: return QSOperator::Add;
+    case QSOperator::InplaceLeftShift: return QSOperator::LShift;
+    case QSOperator::InplaceMod: return QSOperator::Mod;
+    case QSOperator::InplaceMul: return QSOperator::Mul;
+    case QSOperator::InplaceOr: return QSOperator::BitOr;
+    case QSOperator::InplaceRightShift: return QSOperator::RShift;
+    case QSOperator::InplaceURightShift: return QSOperator::URShift;
+    case QSOperator::InplaceXor: return QSOperator::BitXor;
+    default: return QSOperator::Invalid;
     }
 }
 
@@ -1212,89 +703,89 @@ bool Codegen::visit(BinaryExpression *ast)
 
     if (ast->op == QSOperator::And) {
         if (_expr.accept(cx)) {
-            IR::BasicBlock *iftrue = _function->newBasicBlock(exceptionHandler());
-            condition(ast->left, iftrue, _expr.iffalse);
-            _block = iftrue;
-            condition(ast->right, _expr.iftrue, _expr.iffalse);
+            auto iftrue = bytecodeGenerator->newLabel();
+            condition(ast->left, &iftrue, _expr.iffalse(), true);
+            iftrue.link();
+            condition(ast->right, _expr.iftrue(), _expr.iffalse(), _expr.trueBlockFollowsCondition());
         } else {
-            IR::BasicBlock *iftrue = _function->newBasicBlock(exceptionHandler());
-            IR::BasicBlock *endif = _function->newBasicBlock(exceptionHandler());
-
-            const unsigned r = _block->newTemp();
+            auto iftrue = bytecodeGenerator->newLabel();
+            auto endif = bytecodeGenerator->newLabel();
 
-            Result lhs = expression(ast->left);
+            Reference left = expression(ast->left);
             if (hasError)
                 return false;
-            move(_block->TEMP(r), *lhs);
-            setLocation(cjump(_block->TEMP(r), iftrue, endif), ast->operatorToken);
-            _block = iftrue;
-            Result rhs = expression(ast->right);
+            left.loadInAccumulator();
+
+            bytecodeGenerator->setLocation(ast->operatorToken);
+            bytecodeGenerator->jumpFalse().link(endif);
+            iftrue.link();
+
+            Reference right = expression(ast->right);
             if (hasError)
                 return false;
-            move(_block->TEMP(r), *rhs);
-            _block->JUMP(endif);
+            right.loadInAccumulator();
 
-            _expr.code = _block->TEMP(r);
-            _block = endif;
+            endif.link();
+
+            _expr.setResult(Reference::fromAccumulator(this));
         }
         return false;
     } else if (ast->op == QSOperator::Or) {
         if (_expr.accept(cx)) {
-            IR::BasicBlock *iffalse = _function->newBasicBlock(exceptionHandler());
-            condition(ast->left, _expr.iftrue, iffalse);
-            _block = iffalse;
-            condition(ast->right, _expr.iftrue, _expr.iffalse);
+            auto iffalse = bytecodeGenerator->newLabel();
+            condition(ast->left, _expr.iftrue(), &iffalse, false);
+            iffalse.link();
+            condition(ast->right, _expr.iftrue(), _expr.iffalse(), _expr.trueBlockFollowsCondition());
         } else {
-            IR::BasicBlock *iffalse = _function->newBasicBlock(exceptionHandler());
-            IR::BasicBlock *endif = _function->newBasicBlock(exceptionHandler());
+            auto iffalse = bytecodeGenerator->newLabel();
+            auto endif = bytecodeGenerator->newLabel();
 
-            const unsigned r = _block->newTemp();
-            Result lhs = expression(ast->left);
+            Reference left = expression(ast->left);
             if (hasError)
                 return false;
-            move(_block->TEMP(r), *lhs);
-            setLocation(cjump(_block->TEMP(r), endif, iffalse), ast->operatorToken);
-            _block = iffalse;
-            Result rhs = expression(ast->right);
+            left.loadInAccumulator();
+
+            bytecodeGenerator->setLocation(ast->operatorToken);
+            bytecodeGenerator->jumpTrue().link(endif);
+            iffalse.link();
+
+            Reference right = expression(ast->right);
             if (hasError)
                 return false;
-            move(_block->TEMP(r), *rhs);
-            _block->JUMP(endif);
+            right.loadInAccumulator();
+
+            endif.link();
 
-            _block = endif;
-            _expr.code = _block->TEMP(r);
+            _expr.setResult(Reference::fromAccumulator(this));
         }
         return false;
     }
 
-    IR::Expr* left = *expression(ast->left);
+    Reference left = expression(ast->left);
     if (hasError)
         return false;
 
     switch (ast->op) {
     case QSOperator::Or:
     case QSOperator::And:
+        Q_UNREACHABLE(); // handled separately above
         break;
 
     case QSOperator::Assign: {
+        if (!left.isLValue()) {
+            throwReferenceError(ast->operatorToken, QStringLiteral("left-hand side of assignment operator is not an lvalue"));
+            return false;
+        }
+        left = left.asLValue();
         if (throwSyntaxErrorOnEvalOrArgumentsInStrictMode(left, ast->left->lastSourceLocation()))
             return false;
-        Result right = expression(ast->right);
+        expression(ast->right).loadInAccumulator();
         if (hasError)
             return false;
-        if (!left->isLValue()) {
-            throwReferenceError(ast->operatorToken, QStringLiteral("left-hand side of assignment operator is not an lvalue"));
-            return false;
-        }
-
-        if (_expr.accept(nx)) {
-            move(left, *right);
-        } else {
-            const unsigned t = _block->newTemp();
-            move(_block->TEMP(t), *right);
-            move(left, _block->TEMP(t));
-            _expr.code = _block->TEMP(t);
-        }
+        if (_expr.accept(nx))
+            _expr.setResult(left.storeConsumeAccumulator());
+        else
+            _expr.setResult(left.storeRetainAccumulator());
         break;
     }
 
@@ -1311,23 +802,36 @@ bool Codegen::visit(BinaryExpression *ast)
     case QSOperator::InplaceXor: {
         if (throwSyntaxErrorOnEvalOrArgumentsInStrictMode(left, ast->left->lastSourceLocation()))
             return false;
-        Result right = expression(ast->right);
-        if (hasError)
-            return false;
-        if (!left->isLValue()) {
+
+        if (!left.isLValue()) {
             throwSyntaxError(ast->operatorToken, QStringLiteral("left-hand side of inplace operator is not an lvalue"));
             return false;
         }
+        left = left.asLValue();
+
+        Reference tempLeft = left.storeOnStack();
+        Reference right = expression(ast->right);
+
+        if (hasError)
+            return false;
+
+        binopHelper(baseOp(ast->op), tempLeft, right).loadInAccumulator();
+        _expr.setResult(left.storeRetainAccumulator());
 
-        TempScope scope(_function);
-        const unsigned t = _block->newTemp();
-        move(_block->TEMP(t), *right);
-        move(left, _block->TEMP(t), baseOp(ast->op));
-        if (!_expr.accept(nx))
-            _expr.code = left;
         break;
     }
 
+    case QSOperator::BitAnd:
+    case QSOperator::BitOr:
+    case QSOperator::BitXor:
+        if (left.isConst()) {
+            Reference right = expression(ast->right);
+            if (hasError)
+                return false;
+            _expr.setResult(binopHelper(static_cast<QSOperator::Op>(ast->op), right, left));
+            break;
+        }
+        // intentional fall-through!
     case QSOperator::In:
     case QSOperator::InstanceOf:
     case QSOperator::Equal:
@@ -1337,55 +841,408 @@ bool Codegen::visit(BinaryExpression *ast)
     case QSOperator::Le:
     case QSOperator::Lt:
     case QSOperator::StrictEqual:
-    case QSOperator::StrictNotEqual: {
-        TempScope scope(_function);
-        if (!left->asTemp() && !left->asArgLocal() && !left->asConst()) {
-            const unsigned t = _block->newTemp();
-            setLocation(move(_block->TEMP(t), left), ast->operatorToken);
-            left = _block->TEMP(t);
+    case QSOperator::StrictNotEqual:
+    case QSOperator::Add:
+    case QSOperator::Div:
+    case QSOperator::Mod:
+    case QSOperator::Mul:
+    case QSOperator::Sub:
+    case QSOperator::LShift:
+    case QSOperator::RShift:
+    case QSOperator::URShift: {
+        Reference right;
+        if (AST::NumericLiteral *rhs = AST::cast<AST::NumericLiteral *>(ast->right)) {
+            visit(rhs);
+            right = _expr.result();
+        } else {
+            left = left.storeOnStack(); // force any loads of the lhs, so the rhs won't clobber it
+            right = expression(ast->right);
         }
-
-        Result right = expression(ast->right);
         if (hasError)
             return false;
 
-        if (_expr.accept(cx)) {
-            setLocation(cjump(binop(IR::binaryOperator(ast->op), left, *right, ast->operatorToken), _expr.iftrue, _expr.iffalse), ast->operatorToken);
+        _expr.setResult(binopHelper(static_cast<QSOperator::Op>(ast->op), left, right));
+
+        break;
+    }
+
+    } // switch
+
+    return false;
+}
+
+Codegen::Reference Codegen::binopHelper(QSOperator::Op oper, Reference &left, Reference &right)
+{
+    switch (oper) {
+    case QSOperator::Add: {
+        //### Todo: when we add type hints, we can generate an Increment when both the lhs is a number and the rhs == 1
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        Instruction::Add add;
+        add.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(add);
+        break;
+    }
+    case QSOperator::Sub: {
+        if (right.isConst() && right.constant == Encode(int(1))) {
+            left.loadInAccumulator();
+            bytecodeGenerator->addInstruction(Instruction::Decrement());
         } else {
-            _expr.code = binop(IR::binaryOperator(ast->op), left, *right, ast->operatorToken);
+            left = left.storeOnStack();
+            right.loadInAccumulator();
+            Instruction::Sub sub;
+            sub.lhs = left.stackSlot();
+            bytecodeGenerator->addInstruction(sub);
         }
         break;
     }
-
-    case QSOperator::Add:
+    case QSOperator::Mul: {
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        Instruction::Mul mul;
+        mul.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(mul);
+        break;
+    }
+    case QSOperator::Div: {
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        Instruction::Div div;
+        div.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(div);
+        break;
+    }
+    case QSOperator::Mod: {
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        Instruction::Mod mod;
+        mod.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(mod);
+        break;
+    }
     case QSOperator::BitAnd:
+        if (right.isConst()) {
+            int rightAsInt = Primitive::fromReturnedValue(right.constant).toInt32();
+            if (left.isConst()) {
+                int result = Primitive::fromReturnedValue(left.constant).toInt32() & rightAsInt;
+                return Reference::fromConst(this, Encode(result));
+            }
+            left.loadInAccumulator();
+            Instruction::BitAndConst bitAnd;
+            bitAnd.rhs = rightAsInt;
+            bytecodeGenerator->addInstruction(bitAnd);
+        } else {
+            right.loadInAccumulator();
+            Instruction::BitAnd bitAnd;
+            bitAnd.lhs = left.stackSlot();
+            bytecodeGenerator->addInstruction(bitAnd);
+        }
+        break;
     case QSOperator::BitOr:
+        if (right.isConst()) {
+            int rightAsInt = Primitive::fromReturnedValue(right.constant).toInt32();
+            if (left.isConst()) {
+                int result = Primitive::fromReturnedValue(left.constant).toInt32() | rightAsInt;
+                return Reference::fromConst(this, Encode(result));
+            }
+            left.loadInAccumulator();
+            Instruction::BitOrConst bitOr;
+            bitOr.rhs = rightAsInt;
+            bytecodeGenerator->addInstruction(bitOr);
+        } else {
+            right.loadInAccumulator();
+            Instruction::BitOr bitOr;
+            bitOr.lhs = left.stackSlot();
+            bytecodeGenerator->addInstruction(bitOr);
+        }
+        break;
     case QSOperator::BitXor:
-    case QSOperator::Div:
-    case QSOperator::LShift:
-    case QSOperator::Mod:
-    case QSOperator::Mul:
+        if (right.isConst()) {
+            int rightAsInt = Primitive::fromReturnedValue(right.constant).toInt32();
+            if (left.isConst()) {
+                int result = Primitive::fromReturnedValue(left.constant).toInt32() ^ rightAsInt;
+                return Reference::fromConst(this, Encode(result));
+            }
+            left.loadInAccumulator();
+            Instruction::BitXorConst bitXor;
+            bitXor.rhs = rightAsInt;
+            bytecodeGenerator->addInstruction(bitXor);
+        } else {
+            right.loadInAccumulator();
+            Instruction::BitXor bitXor;
+            bitXor.lhs = left.stackSlot();
+            bytecodeGenerator->addInstruction(bitXor);
+        }
+        break;
+    case QSOperator::URShift:
+        if (right.isConst()) {
+            left.loadInAccumulator();
+            Instruction::UShrConst ushr;
+            ushr.rhs = Primitive::fromReturnedValue(right.constant).toInt32() & 0x1f;
+            bytecodeGenerator->addInstruction(ushr);
+        } else {
+            right.loadInAccumulator();
+            Instruction::UShr ushr;
+            ushr.lhs = left.stackSlot();
+            bytecodeGenerator->addInstruction(ushr);
+        }
+        break;
     case QSOperator::RShift:
-    case QSOperator::Sub:
-    case QSOperator::URShift: {
-        TempScope scope(_function);
-        if (!left->asTemp() && !left->asArgLocal() && !left->asConst()) {
-            const unsigned t = _block->newTemp();
-            setLocation(move(_block->TEMP(t), left), ast->operatorToken);
-            left = _block->TEMP(t);
+        if (right.isConst()) {
+            left.loadInAccumulator();
+            Instruction::ShrConst shr;
+            shr.rhs = Primitive::fromReturnedValue(right.constant).toInt32() & 0x1f;
+            bytecodeGenerator->addInstruction(shr);
+        } else {
+            right.loadInAccumulator();
+            Instruction::Shr shr;
+            shr.lhs = left.stackSlot();
+            bytecodeGenerator->addInstruction(shr);
+        }
+        break;
+    case QSOperator::LShift:
+        if (right.isConst()) {
+            left.loadInAccumulator();
+            Instruction::ShlConst shl;
+            shl.rhs = Primitive::fromReturnedValue(right.constant).toInt32() & 0x1f;
+            bytecodeGenerator->addInstruction(shl);
+        } else {
+            right.loadInAccumulator();
+            Instruction::Shl shl;
+            shl.lhs = left.stackSlot();
+            bytecodeGenerator->addInstruction(shl);
         }
+        break;
+    case QSOperator::InstanceOf: {
+        Instruction::CmpInstanceOf binop;
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        binop.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(binop);
+        break;
+    }
+    case QSOperator::In: {
+        Instruction::CmpIn binop;
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        binop.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(binop);
+        break;
+    }
+    case QSOperator::StrictEqual: {
+        if (_expr.accept(cx))
+            return jumpBinop(oper, left, right);
 
-        Result right = expression(ast->right);
-        if (hasError)
-            return false;
+        Instruction::CmpStrictEqual cmp;
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        break;
+    }
+    case QSOperator::StrictNotEqual: {
+        if (_expr.accept(cx))
+            return jumpBinop(oper, left, right);
+
+        Instruction::CmpStrictNotEqual cmp;
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        break;
+    }
+    case QSOperator::Equal: {
+        if (_expr.accept(cx))
+            return jumpBinop(oper, left, right);
 
-        _expr.code = binop(IR::binaryOperator(ast->op), left, *right, ast->operatorToken);
+        Instruction::CmpEq cmp;
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
         break;
     }
+    case QSOperator::NotEqual: {
+        if (_expr.accept(cx))
+            return jumpBinop(oper, left, right);
 
-    } // switch
+        Instruction::CmpNe cmp;
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        break;
+    }
+    case QSOperator::Gt: {
+        if (_expr.accept(cx))
+            return jumpBinop(oper, left, right);
 
-    return false;
+        Instruction::CmpGt cmp;
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        break;
+    }
+    case QSOperator::Ge: {
+        if (_expr.accept(cx))
+            return jumpBinop(oper, left, right);
+
+        Instruction::CmpGe cmp;
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        break;
+    }
+    case QSOperator::Lt: {
+        if (_expr.accept(cx))
+            return jumpBinop(oper, left, right);
+
+        Instruction::CmpLt cmp;
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        break;
+    }
+    case QSOperator::Le:
+        if (_expr.accept(cx))
+            return jumpBinop(oper, left, right);
+
+        Instruction::CmpLe cmp;
+        left = left.storeOnStack();
+        right.loadInAccumulator();
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        break;
+    default:
+        Q_UNREACHABLE();
+    }
+
+    return Reference::fromAccumulator(this);
+}
+
+static QSOperator::Op operatorForSwappedOperands(QSOperator::Op oper)
+{
+    switch (oper) {
+    case QSOperator::StrictEqual: return QSOperator::StrictEqual;
+    case QSOperator::StrictNotEqual: return QSOperator::StrictNotEqual;
+    case QSOperator::Equal: return QSOperator::Equal;
+    case QSOperator::NotEqual: return QSOperator::NotEqual;
+    case QSOperator::Gt: return QSOperator::Le;
+    case QSOperator::Ge: return QSOperator::Lt;
+    case QSOperator::Lt: return QSOperator::Ge;
+    case QSOperator::Le: return QSOperator::Gt;
+    default: Q_UNIMPLEMENTED(); return QSOperator::Invalid;
+    }
+}
+
+Codegen::Reference Codegen::jumpBinop(QSOperator::Op oper, Reference &left, Reference &right)
+{
+    if (left.isConst()) {
+        oper = operatorForSwappedOperands(oper);
+        qSwap(left, right);
+    }
+
+    if (right.isConst() && (oper == QSOperator::Equal || oper == QSOperator::NotEqual)) {
+        Value c = Primitive::fromReturnedValue(right.constant);
+        if (c.isNull() || c.isUndefined()) {
+            left.loadInAccumulator();
+            if (oper == QSOperator::Equal) {
+                Instruction::CmpEqNull cmp;
+                bytecodeGenerator->addInstruction(cmp);
+                addCJump();
+                return Reference();
+            } else if (oper == QSOperator::NotEqual) {
+                Instruction::CmpNeNull cmp;
+                bytecodeGenerator->addInstruction(cmp);
+                addCJump();
+                return Reference();
+            }
+        } else if (c.isInt32()) {
+            left.loadInAccumulator();
+            if (oper == QSOperator::Equal) {
+                Instruction::CmpEqInt cmp;
+                cmp.lhs = c.int_32();
+                bytecodeGenerator->addInstruction(cmp);
+                addCJump();
+                return Reference();
+            } else if (oper == QSOperator::NotEqual) {
+                Instruction::CmpNeInt cmp;
+                cmp.lhs = c.int_32();
+                bytecodeGenerator->addInstruction(cmp);
+                addCJump();
+                return Reference();
+            }
+
+        }
+    }
+
+    left = left.storeOnStack();
+    right.loadInAccumulator();
+
+    switch (oper) {
+    case QSOperator::StrictEqual: {
+        Instruction::CmpStrictEqual cmp;
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        addCJump();
+        break;
+    }
+    case QSOperator::StrictNotEqual: {
+        Instruction::CmpStrictNotEqual cmp;
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        addCJump();
+        break;
+    }
+    case QSOperator::Equal: {
+        Instruction::CmpEq cmp;
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        addCJump();
+        break;
+    }
+    case QSOperator::NotEqual: {
+        Instruction::CmpNe cmp;
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        addCJump();
+        break;
+    }
+    case QSOperator::Gt: {
+        Instruction::CmpGt cmp;
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        addCJump();
+        break;
+    }
+    case QSOperator::Ge: {
+        Instruction::CmpGe cmp;
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        addCJump();
+        break;
+    }
+    case QSOperator::Lt: {
+        Instruction::CmpLt cmp;
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        addCJump();
+        break;
+    }
+    case QSOperator::Le: {
+        Instruction::CmpLe cmp;
+        cmp.lhs = left.stackSlot();
+        bytecodeGenerator->addInstruction(cmp);
+        addCJump();
+        break;
+    }
+    default:
+        Q_UNREACHABLE();
+    }
+    return Reference();
 }
 
 bool Codegen::visit(CallExpression *ast)
@@ -1393,54 +1250,138 @@ bool Codegen::visit(CallExpression *ast)
     if (hasError)
         return false;
 
-    Result base = expression(ast->base);
-    IR::ExprList *args = 0, **args_it = &args;
-    for (ArgumentList *it = ast->arguments; it; it = it->next) {
-        Result arg = expression(it->expression);
-        if (hasError)
-            return false;
-        IR::Expr *actual = argument(*arg);
-        *args_it = _function->New<IR::ExprList>();
-        (*args_it)->init(actual);
-        args_it = &(*args_it)->next;
+    RegisterScope scope(this);
+
+    Reference base = expression(ast->base);
+    if (hasError)
+        return false;
+    switch (base.type) {
+    case Reference::Member:
+    case Reference::Subscript:
+        base = base.asLValue();
+        break;
+    case Reference::Name:
+        break;
+    default:
+        base = base.storeOnStack();
+        break;
     }
+
+    auto calldata = pushArgs(ast->arguments);
     if (hasError)
         return false;
-    _expr.code = call(*base, args);
+
+    //### Do we really need all these call instructions? can's we load the callee in a temp?
+    if (base.type == Reference::Member) {
+        if (useFastLookups) {
+            Instruction::CallPropertyLookup call;
+            call.base = base.propertyBase.stackSlot();
+            call.lookupIndex = registerGetterLookup(base.propertyNameIndex);
+            call.argc = calldata.argc;
+            call.argv = calldata.argv;
+            bytecodeGenerator->addInstruction(call);
+        } else {
+            Instruction::CallProperty call;
+            call.base = base.propertyBase.stackSlot();
+            call.name = base.propertyNameIndex;
+            call.argc = calldata.argc;
+            call.argv = calldata.argv;
+            bytecodeGenerator->addInstruction(call);
+        }
+    } else if (base.type == Reference::Subscript) {
+        Instruction::CallElement call;
+        call.base = base.elementBase;
+        call.index = base.elementSubscript.stackSlot();
+        call.argc = calldata.argc;
+        call.argv = calldata.argv;
+        bytecodeGenerator->addInstruction(call);
+    } else if (base.type == Reference::Name) {
+        if (base.name == QStringLiteral("eval")) {
+            Instruction::CallPossiblyDirectEval call;
+            call.argc = calldata.argc;
+            call.argv = calldata.argv;
+            bytecodeGenerator->addInstruction(call);
+        } else if (useFastLookups && base.global) {
+            Instruction::CallGlobalLookup call;
+            call.index = registerGlobalGetterLookup(base.nameAsIndex());
+            call.argc = calldata.argc;
+            call.argv = calldata.argv;
+            bytecodeGenerator->addInstruction(call);
+        } else {
+            Instruction::CallName call;
+            call.name = base.nameAsIndex();
+            call.argc = calldata.argc;
+            call.argv = calldata.argv;
+            bytecodeGenerator->addInstruction(call);
+        }
+    } else {
+        base.loadInAccumulator();
+
+        Instruction::CallValue call;
+        call.argc = calldata.argc;
+        call.argv = calldata.argv;
+        bytecodeGenerator->addInstruction(call);
+    }
+
+    _expr.setResult(Reference::fromAccumulator(this));
     return false;
 }
 
+Codegen::Arguments Codegen::pushArgs(ArgumentList *args)
+{
+    int argc = 0;
+    for (ArgumentList *it = args; it; it = it->next)
+        ++argc;
+
+    if (!argc)
+        return { 0, 0 };
+
+    int calldata = bytecodeGenerator->newRegisterArray(argc);
+
+    argc = 0;
+    for (ArgumentList *it = args; it; it = it->next) {
+        RegisterScope scope(this);
+        Reference e = expression(it->expression);
+        if (hasError)
+            break;
+        if (!argc && !it->next) {
+            // avoid copy for functions taking a single argument
+            if (e.isStackSlot())
+                return { 1, e.stackSlot() };
+        }
+        (void) e.storeOnStack(calldata + argc);
+        ++argc;
+    }
+
+    return { argc, calldata };
+}
+
 bool Codegen::visit(ConditionalExpression *ast)
 {
     if (hasError)
         return true;
 
-    IR::BasicBlock *iftrue = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *iffalse = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *endif = _function->newBasicBlock(exceptionHandler());
+    RegisterScope scope(this);
 
-    const unsigned t = _block->newTemp();
-    TempScope scope(_function);
+    BytecodeGenerator::Label iftrue = bytecodeGenerator->newLabel();
+    BytecodeGenerator::Label iffalse = bytecodeGenerator->newLabel();
+    condition(ast->expression, &iftrue, &iffalse, true);
 
-    condition(ast->expression, iftrue, iffalse);
-
-    _block = iftrue;
-    Result ok = expression(ast->ok);
+    iftrue.link();
+    Reference ok = expression(ast->ok);
     if (hasError)
         return false;
-    move(_block->TEMP(t), *ok);
-    _block->JUMP(endif);
+    ok.loadInAccumulator();
+    BytecodeGenerator::Jump jump_endif = bytecodeGenerator->jump();
 
-    _block = iffalse;
-    Result ko = expression(ast->ko);
+    iffalse.link();
+    Reference ko = expression(ast->ko);
     if (hasError)
         return false;
-    move(_block->TEMP(t), *ko);
-    _block->JUMP(endif);
-
-    _block = endif;
+    ko.loadInAccumulator();
 
-    _expr.code = _block->TEMP(t);
+    jump_endif.link();
+    _expr.setResult(Reference::fromAccumulator(this));
 
     return false;
 }
@@ -1450,48 +1391,59 @@ bool Codegen::visit(DeleteExpression *ast)
     if (hasError)
         return false;
 
-    IR::Expr* expr = *expression(ast->expression);
+    Reference expr = expression(ast->expression);
     if (hasError)
         return false;
-    // Temporaries cannot be deleted
-    IR::ArgLocal *al = expr->asArgLocal();
-    if (al && al->index < static_cast<unsigned>(_variableEnvironment->members.size())) {
+
+    switch (expr.type) {
+    case Reference::StackSlot:
+        if (!expr.stackSlotIsLocalOrArgument)
+            break;
+        // fall through
+    case Reference::ScopedLocal:
         // Trying to delete a function argument might throw.
-        if (_function->isStrict) {
+        if (_context->isStrict) {
             throwSyntaxError(ast->deleteToken, QStringLiteral("Delete of an unqualified identifier in strict mode."));
             return false;
         }
-        _expr.code = _block->CONST(IR::BoolType, 0);
+        _expr.setResult(Reference::fromConst(this, QV4::Encode(false)));
         return false;
-    }
-    if (_function->isStrict && expr->asName()) {
-        throwSyntaxError(ast->deleteToken, QStringLiteral("Delete of an unqualified identifier in strict mode."));
+    case Reference::Name: {
+        if (_context->isStrict) {
+            throwSyntaxError(ast->deleteToken, QStringLiteral("Delete of an unqualified identifier in strict mode."));
+            return false;
+        }
+        Instruction::DeleteName del;
+        del.name = expr.nameAsIndex();
+        bytecodeGenerator->addInstruction(del);
+        _expr.setResult(Reference::fromAccumulator(this));
         return false;
     }
-
-    // [[11.4.1]] Return true if it's not a reference
-    if (expr->asConst() || expr->asString()) {
-        _expr.code = _block->CONST(IR::BoolType, 1);
+    case Reference::Member: {
+        //### maybe add a variant where the base can be in the accumulator?
+        expr = expr.asLValue();
+        Instruction::DeleteMember del;
+        del.base = expr.propertyBase.stackSlot();
+        del.member = expr.propertyNameIndex;
+        bytecodeGenerator->addInstruction(del);
+        _expr.setResult(Reference::fromAccumulator(this));
         return false;
     }
-
-    // Return values from calls are also not a reference, but we have to
-    // perform the call to allow for side effects.
-    if (expr->asCall()) {
-        _block->EXP(expr);
-        _expr.code = _block->CONST(IR::BoolType, 1);
+    case Reference::Subscript: {
+        //### maybe add a variant where the index can be in the accumulator?
+        expr = expr.asLValue();
+        Instruction::DeleteSubscript del;
+        del.base = expr.elementBase;
+        del.index = expr.elementSubscript.stackSlot();
+        bytecodeGenerator->addInstruction(del);
+        _expr.setResult(Reference::fromAccumulator(this));
         return false;
     }
-    if (expr->asTemp() ||
-            (expr->asArgLocal() &&
-             expr->asArgLocal()->index >= static_cast<unsigned>(_variableEnvironment->members.size()))) {
-        _expr.code = _block->CONST(IR::BoolType, 1);
-        return false;
+    default:
+        break;
     }
-
-    IR::ExprList *args = _function->New<IR::ExprList>();
-    args->init(reference(expr));
-    _expr.code = call(_block->NAME(IR::Name::builtin_delete, ast->deleteToken.startLine, ast->deleteToken.startColumn), args);
+    // [[11.4.1]] Return true if it's not a reference
+    _expr.setResult(Reference::fromConst(this, QV4::Encode(true)));
     return false;
 }
 
@@ -1500,11 +1452,7 @@ bool Codegen::visit(FalseLiteral *)
     if (hasError)
         return false;
 
-    if (_expr.accept(cx)) {
-        _block->JUMP(_expr.iffalse);
-    } else {
-        _expr.code = _block->CONST(IR::BoolType, 0);
-    }
+    _expr.setResult(Reference::fromConst(this, QV4::Encode(false)));
     return false;
 }
 
@@ -1513,9 +1461,10 @@ bool Codegen::visit(FieldMemberExpression *ast)
     if (hasError)
         return false;
 
-    Result base = expression(ast->base);
-    if (!hasError)
-        _expr.code = member(*base, _function->newString(ast->name.toString()));
+    Reference base = expression(ast->base);
+    if (hasError)
+        return false;
+    _expr.setResult(Reference::fromMember(base, ast->name.toString()));
     return false;
 }
 
@@ -1524,64 +1473,109 @@ bool Codegen::visit(FunctionExpression *ast)
     if (hasError)
         return false;
 
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
     int function = defineFunction(ast->name.toString(), ast, ast->formals, ast->body ? ast->body->elements : 0);
-    _expr.code = _block->CLOSURE(function);
+    loadClosure(function);
+    _expr.setResult(Reference::fromAccumulator(this));
     return false;
 }
 
-IR::Expr *Codegen::identifier(const QString &name, int line, int col)
+Codegen::Reference Codegen::referenceForName(const QString &name, bool isLhs)
 {
-    if (hasError)
-        return 0;
-
-    uint scope = 0;
-    Environment *e = _variableEnvironment;
-    IR::Function *f = _function;
+    int scope = 0;
+    Context *c = _context;
 
-    while (f && e->parent) {
-        if (f->insideWithOrCatch || (f->isNamedExpression && QStringRef(f->name) == name))
-            return _block->NAME(name, line, col);
-
-        int index = e->findMember(name);
-        Q_ASSERT (index < e->members.size());
-        if (index != -1) {
-            IR::ArgLocal *al = _block->LOCAL(index, scope);
-            if (name == QLatin1String("arguments") || name == QLatin1String("eval"))
-                al->isArgumentsOrEval = true;
-            return al;
+    // skip the innermost context if it's simple (as the runtime won't
+    // create a context for it
+    if (c->canUseSimpleCall()) {
+        Context::Member m = c->findMember(name);
+        if (m.type != Context::UndefinedMember) {
+            Q_ASSERT((!m.canEscape));
+            Reference r = Reference::fromStackSlot(this, m.index, true /*isLocal*/);
+            if (name == QLatin1String("arguments") || name == QLatin1String("eval")) {
+                r.isArgOrEval = true;
+                if (isLhs && c->isStrict)
+                    // ### add correct source location
+                    throwSyntaxError(SourceLocation(), QStringLiteral("Variable name may not be eval or arguments in strict mode"));
+            }
+            return r;
+        }
+        const int argIdx = c->findArgument(name);
+        if (argIdx != -1) {
+            Q_ASSERT(!c->argumentsCanEscape && (c->usesArgumentsObject != Context::ArgumentsObjectUsed || c->isStrict));
+            return Reference::fromArgument(this, argIdx, _volataleMemoryLocations.isVolatile(name));
+        }
+        c = c->parent;
+    }
+
+    while (c->parent) {
+        if (c->forceLookupByName())
+            goto loadByName;
+
+        Context::Member m = c->findMember(name);
+        if (m.type != Context::UndefinedMember) {
+            Reference r = m.canEscape ? Reference::fromScopedLocal(this, m.index, scope)
+                                      : Reference::fromStackSlot(this, m.index, true /*isLocal*/);
+            if (name == QLatin1String("arguments") || name == QLatin1String("eval")) {
+                r.isArgOrEval = true;
+                if (isLhs && c->isStrict)
+                    // ### add correct source location
+                    throwSyntaxError(SourceLocation(), QStringLiteral("Variable name may not be eval or arguments in strict mode"));
+            }
+            return r;
+        }
+        const int argIdx = c->findArgument(name);
+        if (argIdx != -1) {
+            if (c->argumentsCanEscape || c->usesArgumentsObject == Context::ArgumentsObjectUsed) {
+                int idx = argIdx + c->locals.size();
+                return Reference::fromScopedLocal(this, idx, scope);
+            } else {
+                Q_ASSERT(scope == 0);
+                return Reference::fromArgument(this, argIdx, _volataleMemoryLocations.isVolatile(name));
+            }
         }
-        const int argIdx = f->indexOfArgument(QStringRef(&name));
-        if (argIdx != -1)
-            return _block->ARG(argIdx, scope);
 
-        if (!f->isStrict && f->hasDirectEval)
-            return _block->NAME(name, line, col);
+        if (!c->isStrict && c->hasDirectEval)
+            goto loadByName;
 
         ++scope;
-        e = e->parent;
-        f = f->outer;
+        c = c->parent;
     }
 
-    // This hook allows implementing QML lookup semantics
-    if (IR::Expr *fallback = fallbackNameLookup(name, line, col))
-        return fallback;
+    {
+        // This hook allows implementing QML lookup semantics
+        Reference fallback = fallbackNameLookup(name);
+        if (fallback.type != Reference::Invalid)
+            return fallback;
+    }
 
-    if (!e->parent && (!f || !f->insideWithOrCatch) && _variableEnvironment->compilationMode != EvalCode && e->compilationMode != QmlBinding)
-        return _block->GLOBALNAME(name, line, col);
+    if (!c->parent && !c->forceLookupByName() && _context->compilationMode != EvalCode && c->compilationMode != QmlBinding) {
+        Reference r = Reference::fromName(this, name);
+        r.global = true;
+        return r;
+    }
 
     // global context or with. Lookup by name
-    return _block->NAME(name, line, col);
+  loadByName:
+    return Reference::fromName(this, name);
+}
 
+void Codegen::loadClosure(int closureId)
+{
+    if (closureId >= 0) {
+        Instruction::LoadClosure load;
+        load.value = closureId;
+        bytecodeGenerator->addInstruction(load);
+    } else {
+        Reference::fromConst(this, Encode::undefined()).loadInAccumulator();
+    }
 }
 
-IR::Expr *Codegen::fallbackNameLookup(const QString &name, int line, int col)
+Codegen::Reference Codegen::fallbackNameLookup(const QString &name)
 {
     Q_UNUSED(name)
-    Q_UNUSED(line)
-    Q_UNUSED(col)
-    return 0;
+    return Reference();
 }
 
 bool Codegen::visit(IdentifierExpression *ast)
@@ -1589,7 +1583,7 @@ bool Codegen::visit(IdentifierExpression *ast)
     if (hasError)
         return false;
 
-    _expr.code = identifier(ast->name.toString(), ast->identifierToken.startLine, ast->identifierToken.startColumn);
+    _expr.setResult(referenceForName(ast->name.toString(), false));
     return false;
 }
 
@@ -1606,18 +1600,21 @@ bool Codegen::visit(NewExpression *ast)
 {
     if (hasError)
         return false;
-    TempScope scope(_function);
 
-    Result base = expression(ast->expression);
+    RegisterScope scope(this);
+
+    Reference base = expression(ast->expression);
     if (hasError)
         return false;
-    IR::Expr *expr = *base;
-    if (expr && !expr->asTemp() && !expr->asArgLocal() && !expr->asName() && !expr->asMember()) {
-        const unsigned t = _block->newTemp();
-        move(_block->TEMP(t), expr);
-        expr = _block->TEMP(t);
-    }
-    _expr.code = _block->NEW(expr, 0);
+    //### Maybe create a ConstructA that takes an accumulator?
+    base = base.storeOnStack();
+
+    Instruction::Construct create;
+    create.func = base.stackSlot();
+    create.argc = 0;
+    create.argv = 0;
+    bytecodeGenerator->addInstruction(create);
+    _expr.setResult(Reference::fromAccumulator(this));
     return false;
 }
 
@@ -1626,32 +1623,23 @@ bool Codegen::visit(NewMemberExpression *ast)
     if (hasError)
         return false;
 
-    const unsigned t = _block->newTemp();
+    RegisterScope scope(this);
 
-    TempScope scope(_function);
+    Reference base = expression(ast->base);
+    if (hasError)
+        return false;
+    base = base.storeOnStack();
 
-    Result base = expression(ast->base);
+    auto calldata = pushArgs(ast->arguments);
     if (hasError)
         return false;
-    IR::Expr *expr = *base;
-    if (expr && !expr->asTemp() && !expr->asArgLocal() && !expr->asName() && !expr->asMember()) {
-        const unsigned t = _block->newTemp();
-        move(_block->TEMP(t), expr);
-        expr = _block->TEMP(t);
-    }
 
-    IR::ExprList *args = 0, **args_it = &args;
-    for (ArgumentList *it = ast->arguments; it; it = it->next) {
-        Result arg = expression(it->expression);
-        if (hasError)
-            return false;
-        IR::Expr *actual = argument(*arg);
-        *args_it = _function->New<IR::ExprList>();
-        (*args_it)->init(actual);
-        args_it = &(*args_it)->next;
-    }
-    move(_block->TEMP(t), _block->NEW(expr, args));
-    _expr.code = _block->TEMP(t);
+    Instruction::Construct create;
+    create.func = base.stackSlot();
+    create.argc = calldata.argc;
+    create.argv = calldata.argv;
+    bytecodeGenerator->addInstruction(create);
+    _expr.setResult(Reference::fromAccumulator(this));
     return false;
 }
 
@@ -1660,14 +1648,7 @@ bool Codegen::visit(NotExpression *ast)
     if (hasError)
         return false;
 
-    const unsigned r = _block->newTemp();
-    TempScope scope(_function);
-
-    Result expr = expression(ast->expression);
-    if (hasError)
-        return false;
-    setLocation(move(_block->TEMP(r), unop(IR::OpNot, *expr, ast->notToken)), ast->notToken);
-    _expr.code = _block->TEMP(r);
+    _expr.setResult(unop(Not, expression(ast->expression)));
     return false;
 }
 
@@ -1676,8 +1657,10 @@ bool Codegen::visit(NullExpression *)
     if (hasError)
         return false;
 
-    if (_expr.accept(cx)) _block->JUMP(_expr.iffalse);
-    else _expr.code = _block->CONST(IR::NullType, 0);
+    if (_expr.accept(cx))
+        bytecodeGenerator->jump().link(*_expr.iffalse());
+    else
+        _expr.setResult(Reference::fromConst(this, Encode::null()));
 
     return false;
 }
@@ -1687,30 +1670,10 @@ bool Codegen::visit(NumericLiteral *ast)
     if (hasError)
         return false;
 
-    if (_expr.accept(cx)) {
-        if (ast->value) _block->JUMP(_expr.iftrue);
-        else _block->JUMP(_expr.iffalse);
-    } else {
-        _expr.code = _block->CONST(IR::NumberType, ast->value);
-    }
+    _expr.setResult(Reference::fromConst(this, QV4::Encode::smallestNumber(ast->value)));
     return false;
 }
 
-struct ObjectPropertyValue {
-    ObjectPropertyValue()
-        : value(0)
-        , getter(-1)
-        , setter(-1)
-    {}
-
-    IR::Expr *value;
-    int getter; // index in _module->functions or -1 if not set
-    int setter;
-
-    bool hasGetter() const { return getter >= 0; }
-    bool hasSetter() const { return setter >= 0; }
-};
-
 bool Codegen::visit(ObjectLiteral *ast)
 {
     if (hasError)
@@ -1718,33 +1681,27 @@ bool Codegen::visit(ObjectLiteral *ast)
 
     QMap<QString, ObjectPropertyValue> valueMap;
 
-    const unsigned t = _block->newTemp();
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
     for (PropertyAssignmentList *it = ast->properties; it; it = it->next) {
         QString name = it->assignment->name->asString();
         if (PropertyNameAndValue *nv = AST::cast<AST::PropertyNameAndValue *>(it->assignment)) {
-            Result value = expression(nv->value);
+            Reference value = expression(nv->value);
             if (hasError)
                 return false;
+
             ObjectPropertyValue &v = valueMap[name];
-            if (v.hasGetter() || v.hasSetter() || (_function->isStrict && v.value)) {
+            if (v.hasGetter() || v.hasSetter() || (_context->isStrict && v.rvalue.isValid())) {
                 throwSyntaxError(nv->lastSourceLocation(),
                                  QStringLiteral("Illegal duplicate key '%1' in object literal").arg(name));
                 return false;
             }
 
-            if (IR::Const *c = (*value)->asConst()) {
-                valueMap[name].value = c;
-            } else {
-                unsigned t = _block->newTemp();
-                move(_block->TEMP(t), *value);
-                valueMap[name].value = _block->TEMP(t);
-            }
+            v.rvalue = value.storeOnStack();
         } else if (PropertyGetterSetter *gs = AST::cast<AST::PropertyGetterSetter *>(it->assignment)) {
             const int function = defineFunction(name, gs, gs->formals, gs->functionBody ? gs->functionBody->elements : 0);
             ObjectPropertyValue &v = valueMap[name];
-            if (v.value ||
+            if (v.rvalue.isValid() ||
                 (gs->type == PropertyGetterSetter::Getter && v.hasGetter()) ||
                 (gs->type == PropertyGetterSetter::Setter && v.hasSetter())) {
                 throwSyntaxError(gs->lastSourceLocation(),
@@ -1760,96 +1717,90 @@ bool Codegen::visit(ObjectLiteral *ast)
         }
     }
 
-    // The linked-list arguments to builtin_define_object_literal
-    // begin with a CONST counting the number of key/value pairs, followed by the
-    // key value pairs, followed by the array entries.
-    IR::ExprList *args = _function->New<IR::ExprList>();
-
-    IR::Const *entryCountParam = _function->New<IR::Const>();
-    entryCountParam->init(IR::SInt32Type, 0);
-    args->expr = entryCountParam;
-    args->next = 0;
-
-    IR::ExprList *keyValueEntries = 0;
-    IR::ExprList *currentKeyValueEntry = 0;
-    int keyValueEntryCount = 0;
-    IR::ExprList *arrayEntries = 0;
+    QVector<QString> nonArrayKey, arrayKeyWithValue, arrayKeyWithGetterSetter;
+    bool needSparseArray = false; // set to true if any array index is bigger than 16
 
-    IR::ExprList *currentArrayEntry = 0;
-
-    for (QMap<QString, ObjectPropertyValue>::iterator it = valueMap.begin(); it != valueMap.end(); ) {
-        IR::ExprList **currentPtr = 0;
-        uint keyAsIndex = QV4::String::toArrayIndex(it.key());
-        if (keyAsIndex != UINT_MAX) {
-            if (!arrayEntries) {
-                arrayEntries = _function->New<IR::ExprList>();
-                currentArrayEntry = arrayEntries;
-            } else {
-                currentArrayEntry->next = _function->New<IR::ExprList>();
-                currentArrayEntry = currentArrayEntry->next;
-            }
-            currentPtr = &currentArrayEntry;
-            IR::Const *idx = _function->New<IR::Const>();
-            idx->init(IR::UInt32Type, keyAsIndex);
-            (*currentPtr)->expr = idx;
+    for (QMap<QString, ObjectPropertyValue>::iterator it = valueMap.begin(), eit = valueMap.end();
+            it != eit; ++it) {
+        QString name = it.key();
+        uint keyAsIndex = QV4::String::toArrayIndex(name);
+        if (keyAsIndex != std::numeric_limits<uint>::max()) {
+            it->keyAsIndex = keyAsIndex;
+            if (keyAsIndex > 16)
+                needSparseArray = true;
+            if (it->hasSetter() || it->hasGetter())
+                arrayKeyWithGetterSetter.append(name);
+            else
+                arrayKeyWithValue.append(name);
         } else {
-            if (!keyValueEntries) {
-                keyValueEntries = _function->New<IR::ExprList>();
-                currentKeyValueEntry = keyValueEntries;
-            } else {
-                currentKeyValueEntry->next = _function->New<IR::ExprList>();
-                currentKeyValueEntry = currentKeyValueEntry->next;
-            }
-            currentPtr = &currentKeyValueEntry;
-            (*currentPtr)->expr = _block->NAME(it.key(), 0, 0);
-            keyValueEntryCount++;
+            nonArrayKey.append(name);
         }
+    }
 
-        IR::ExprList *&current = *currentPtr;
-        if (it->value) {
-            current->next = _function->New<IR::ExprList>();
-            current = current->next;
-            current->expr = _block->CONST(IR::BoolType, true);
-
-            current->next = _function->New<IR::ExprList>();
-            current = current->next;
-            current->expr = it->value;
+    int args = -1;
+    auto push = [this, &args](const Reference &arg) {
+        int temp = bytecodeGenerator->newRegister();
+        if (args == -1)
+            args = temp;
+        (void) arg.storeOnStack(temp);
+    };
+
+    QVector<QV4::Compiler::JSUnitGenerator::MemberInfo> members;
+
+    Reference acc = Reference::fromAccumulator(this);
+    // generate the key/value pairs
+    for (const QString &key : qAsConst(nonArrayKey)) {
+        const ObjectPropertyValue &prop = valueMap[key];
+
+        if (prop.hasGetter() || prop.hasSetter()) {
+            Q_ASSERT(!prop.rvalue.isValid());
+            loadClosure(prop.getter);
+            push(acc);
+            loadClosure(prop.setter);
+            push(acc);
+            members.append({ key, true });
         } else {
-            current->next = _function->New<IR::ExprList>();
-            current = current->next;
-            current->expr = _block->CONST(IR::BoolType, false);
-
-            unsigned getter = _block->newTemp();
-            unsigned setter = _block->newTemp();
-            move(_block->TEMP(getter), it->hasGetter() ? _block->CLOSURE(it->getter) : _block->CONST(IR::UndefinedType, 0));
-            move(_block->TEMP(setter), it->hasSetter() ? _block->CLOSURE(it->setter) : _block->CONST(IR::UndefinedType, 0));
-
-            current->next = _function->New<IR::ExprList>();
-            current = current->next;
-            current->expr = _block->TEMP(getter);
-            current->next = _function->New<IR::ExprList>();
-            current = current->next;
-            current->expr = _block->TEMP(setter);
+            Q_ASSERT(prop.rvalue.isValid());
+            push(prop.rvalue);
+            members.append({ key, false });
         }
-
-        it = valueMap.erase(it);
     }
 
-    entryCountParam->value = keyValueEntryCount;
+    // generate array entries with values
+    for (const QString &key : qAsConst(arrayKeyWithValue)) {
+        const ObjectPropertyValue &prop = valueMap[key];
+        Q_ASSERT(!prop.hasGetter() && !prop.hasSetter());
+        push(Reference::fromConst(this, Encode(prop.keyAsIndex)));
+        push(prop.rvalue);
+    }
 
-    if (keyValueEntries)
-        args->next = keyValueEntries;
-    if (arrayEntries) {
-        if (currentKeyValueEntry)
-            currentKeyValueEntry->next = arrayEntries;
-        else
-            args->next = arrayEntries;
+    // generate array entries with both a value and a setter
+    for (const QString &key : qAsConst(arrayKeyWithGetterSetter)) {
+        const ObjectPropertyValue &prop = valueMap[key];
+        Q_ASSERT(!prop.rvalue.isValid());
+        push(Reference::fromConst(this, Encode(prop.keyAsIndex)));
+        loadClosure(prop.getter);
+        push(acc);
+        loadClosure(prop.setter);
+        push(acc);
     }
 
-    move(_block->TEMP(t), _block->CALL(_block->NAME(IR::Name::builtin_define_object_literal,
-         ast->firstSourceLocation().startLine, ast->firstSourceLocation().startColumn), args));
+    int classId = jsUnitGenerator->registerJSClass(members);
+
+    uint arrayGetterSetterCountAndFlags = arrayKeyWithGetterSetter.size();
+    arrayGetterSetterCountAndFlags |= needSparseArray << 30;
 
-    _expr.code = _block->TEMP(t);
+    if (args == -1)
+        args = 0;
+
+    Instruction::DefineObjectLiteral call;
+    call.internalClassId = classId;
+    call.arrayValueCount = arrayKeyWithValue.size();
+    call.arrayGetterSetterCountAndFlags = arrayGetterSetterCountAndFlags;
+    call.args = Moth::StackSlot::createRegister(args);
+    bytecodeGenerator->addInstruction(call);
+
+    _expr.setResult(Reference::fromAccumulator(this));
     return false;
 }
 
@@ -1858,26 +1809,17 @@ bool Codegen::visit(PostDecrementExpression *ast)
     if (hasError)
         return false;
 
-    Result expr = expression(ast->base);
+    Reference expr = expression(ast->base);
     if (hasError)
         return false;
-    if (!expr->isLValue()) {
+    if (!expr.isLValue()) {
         throwReferenceError(ast->base->lastSourceLocation(), QStringLiteral("Invalid left-hand side expression in postfix operation"));
         return false;
     }
-    if (throwSyntaxErrorOnEvalOrArgumentsInStrictMode(*expr, ast->decrementToken))
+    if (throwSyntaxErrorOnEvalOrArgumentsInStrictMode(expr, ast->decrementToken))
         return false;
 
-    const unsigned oldValue = _block->newTemp();
-    setLocation(move(_block->TEMP(oldValue), unop(IR::OpUPlus, *expr, ast->decrementToken)), ast->decrementToken);
-
-    TempScope scope(_function);
-    const unsigned  newValue = _block->newTemp();
-    setLocation(move(_block->TEMP(newValue), binop(IR::OpSub, _block->TEMP(oldValue), _block->CONST(IR::NumberType, 1), ast->decrementToken)), ast->decrementToken);
-    setLocation(move(*expr, _block->TEMP(newValue)), ast->decrementToken);
-
-    if (!_expr.accept(nx))
-        _expr.code = _block->TEMP(oldValue);
+    _expr.setResult(unop(PostDecrement, expr));
 
     return false;
 }
@@ -1887,54 +1829,35 @@ bool Codegen::visit(PostIncrementExpression *ast)
     if (hasError)
         return false;
 
-    Result expr = expression(ast->base);
+    Reference expr = expression(ast->base);
     if (hasError)
         return false;
-    if (!expr->isLValue()) {
+    if (!expr.isLValue()) {
         throwReferenceError(ast->base->lastSourceLocation(), QStringLiteral("Invalid left-hand side expression in postfix operation"));
         return false;
     }
-    if (throwSyntaxErrorOnEvalOrArgumentsInStrictMode(*expr, ast->incrementToken))
+    if (throwSyntaxErrorOnEvalOrArgumentsInStrictMode(expr, ast->incrementToken))
         return false;
 
-    const unsigned oldValue = _block->newTemp();
-    setLocation(move(_block->TEMP(oldValue), unop(IR::OpUPlus, *expr, ast->incrementToken)), ast->incrementToken);
-
-    TempScope scope(_function);
-    const unsigned  newValue = _block->newTemp();
-    setLocation(move(_block->TEMP(newValue), binop(IR::OpAdd, _block->TEMP(oldValue), _block->CONST(IR::NumberType, 1), ast->incrementToken)), ast->incrementToken);
-    setLocation(move(*expr, _block->TEMP(newValue)), ast->incrementToken);
-
-    if (!_expr.accept(nx))
-        _expr.code = _block->TEMP(oldValue);
-
+    _expr.setResult(unop(PostIncrement, expr));
     return false;
 }
 
 bool Codegen::visit(PreDecrementExpression *ast)
-{
-    if (hasError)
+{    if (hasError)
         return false;
 
-    Result expr = expression(ast->expression);
+    Reference expr = expression(ast->expression);
     if (hasError)
         return false;
-    if (!expr->isLValue()) {
+    if (!expr.isLValue()) {
         throwReferenceError(ast->expression->lastSourceLocation(), QStringLiteral("Prefix ++ operator applied to value that is not a reference."));
         return false;
     }
 
-    if (throwSyntaxErrorOnEvalOrArgumentsInStrictMode(*expr, ast->decrementToken))
+    if (throwSyntaxErrorOnEvalOrArgumentsInStrictMode(expr, ast->decrementToken))
         return false;
-    IR::Expr *op = binop(IR::OpSub, *expr, _block->CONST(IR::NumberType, 1), ast->decrementToken);
-    if (_expr.accept(nx)) {
-        setLocation(move(*expr, op), ast->decrementToken);
-    } else {
-        const unsigned t = _block->newTemp();
-        setLocation(move(_block->TEMP(t), op), ast->decrementToken);
-        setLocation(move(*expr, _block->TEMP(t)), ast->decrementToken);
-        _expr.code = _block->TEMP(t);
-    }
+    _expr.setResult(unop(PreDecrement, expr));
     return false;
 }
 
@@ -1943,25 +1866,17 @@ bool Codegen::visit(PreIncrementExpression *ast)
     if (hasError)
         return false;
 
-    Result expr = expression(ast->expression);
+    Reference expr = expression(ast->expression);
     if (hasError)
         return false;
-    if (!expr->isLValue()) {
+    if (!expr.isLValue()) {
         throwReferenceError(ast->expression->lastSourceLocation(), QStringLiteral("Prefix ++ operator applied to value that is not a reference."));
         return false;
     }
 
-    if (throwSyntaxErrorOnEvalOrArgumentsInStrictMode(*expr, ast->incrementToken))
+    if (throwSyntaxErrorOnEvalOrArgumentsInStrictMode(expr, ast->incrementToken))
         return false;
-    IR::Expr *op = binop(IR::OpAdd, unop(IR::OpUPlus, *expr, ast->incrementToken), _block->CONST(IR::NumberType, 1), ast->incrementToken);
-    if (_expr.accept(nx)) {
-        setLocation(move(*expr, op), ast->incrementToken);
-    } else {
-        const unsigned t = _block->newTemp();
-        setLocation(move(_block->TEMP(t), op), ast->incrementToken);
-        setLocation(move(*expr, _block->TEMP(t)), ast->incrementToken);
-        _expr.code = _block->TEMP(t);
-    }
+    _expr.setResult(unop(PreIncrement, expr));
     return false;
 }
 
@@ -1970,7 +1885,13 @@ bool Codegen::visit(RegExpLiteral *ast)
     if (hasError)
         return false;
 
-    _expr.code = _block->REGEXP(_function->newString(ast->pattern.toString()), ast->flags);
+    auto r = Reference::fromAccumulator(this);
+    r.isReadonly = true;
+    _expr.setResult(r);
+
+    Instruction::LoadRegExp instr;
+    instr.regExpId = jsUnitGenerator->registerRegExp(ast);
+    bytecodeGenerator->addInstruction(instr);
     return false;
 }
 
@@ -1979,16 +1900,22 @@ bool Codegen::visit(StringLiteral *ast)
     if (hasError)
         return false;
 
-    _expr.code = _block->STRING(_function->newString(ast->value.toString()));
+    auto r = Reference::fromAccumulator(this);
+    r.isReadonly = true;
+    _expr.setResult(r);
+
+    Instruction::LoadRuntimeString instr;
+    instr.stringId = registerString(ast->value.toString());
+    bytecodeGenerator->addInstruction(instr);
     return false;
 }
 
-bool Codegen::visit(ThisExpression *ast)
+bool Codegen::visit(ThisExpression *)
 {
     if (hasError)
         return false;
 
-    _expr.code = _block->NAME(QStringLiteral("this"), ast->thisToken.startLine, ast->thisToken.startColumn);
+    _expr.setResult(Reference::fromThis(this));
     return false;
 }
 
@@ -1997,14 +1924,7 @@ bool Codegen::visit(TildeExpression *ast)
     if (hasError)
         return false;
 
-    const unsigned t = _block->newTemp();
-    TempScope scope(_function);
-
-    Result expr = expression(ast->expression);
-    if (hasError)
-        return false;
-    setLocation(move(_block->TEMP(t), unop(IR::OpCompl, *expr, ast->tildeToken)), ast->tildeToken);
-    _expr.code = _block->TEMP(t);
+    _expr.setResult(unop(Compl, expression(ast->expression)));
     return false;
 }
 
@@ -2013,11 +1933,7 @@ bool Codegen::visit(TrueLiteral *)
     if (hasError)
         return false;
 
-    if (_expr.accept(cx)) {
-        _block->JUMP(_expr.iftrue);
-    } else {
-        _expr.code = _block->CONST(IR::BoolType, 1);
-    }
+    _expr.setResult(Reference::fromConst(this, QV4::Encode(true)));
     return false;
 }
 
@@ -2026,14 +1942,24 @@ bool Codegen::visit(TypeOfExpression *ast)
     if (hasError)
         return false;
 
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
-    Result expr = expression(ast->expression);
+    Reference expr = expression(ast->expression);
     if (hasError)
         return false;
-    IR::ExprList *args = _function->New<IR::ExprList>();
-    args->init(reference(*expr));
-    _expr.code = call(_block->NAME(IR::Name::builtin_typeof, ast->typeofToken.startLine, ast->typeofToken.startColumn), args);
+
+    if (expr.type == Reference::Name) {
+        // special handling as typeof doesn't throw here
+        Instruction::TypeofName instr;
+        instr.name = expr.nameAsIndex();
+        bytecodeGenerator->addInstruction(instr);
+    } else {
+        expr.loadInAccumulator();
+        Instruction::TypeofValue instr;
+        bytecodeGenerator->addInstruction(instr);
+    }
+    _expr.setResult(Reference::fromAccumulator(this));
+
     return false;
 }
 
@@ -2042,12 +1968,7 @@ bool Codegen::visit(UnaryMinusExpression *ast)
     if (hasError)
         return false;
 
-    Result expr = expression(ast->expression);
-    if (hasError)
-        return false;
-    const unsigned t = _block->newTemp();
-    setLocation(move(_block->TEMP(t), unop(IR::OpUMinus, *expr, ast->minusToken)), ast->minusToken);
-    _expr.code = _block->TEMP(t);
+    _expr.setResult(unop(UMinus, expression(ast->expression)));
     return false;
 }
 
@@ -2056,12 +1977,7 @@ bool Codegen::visit(UnaryPlusExpression *ast)
     if (hasError)
         return false;
 
-    Result expr = expression(ast->expression);
-    if (hasError)
-        return false;
-    const unsigned t = _block->newTemp();
-    setLocation(move(_block->TEMP(t), unop(IR::OpUPlus, *expr, ast->plusToken)), ast->plusToken);
-    _expr.code = _block->TEMP(t);
+    _expr.setResult(unop(UPlus, expression(ast->expression)));
     return false;
 }
 
@@ -2070,10 +1986,10 @@ bool Codegen::visit(VoidExpression *ast)
     if (hasError)
         return false;
 
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
     statement(ast->expression);
-    _expr.code = _block->CONST(IR::UndefinedType, 0);
+    _expr.setResult(Reference::fromConst(this, Encode::undefined()));
     return false;
 }
 
@@ -2082,146 +1998,190 @@ bool Codegen::visit(FunctionDeclaration * ast)
     if (hasError)
         return false;
 
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
-    if (_variableEnvironment->compilationMode == QmlBinding)
-        move(_block->TEMP(_returnAddress), _block->NAME(ast->name.toString(), 0, 0));
+    if (_context->compilationMode == QmlBinding)
+        Reference::fromName(this, ast->name.toString()).loadInAccumulator();
     _expr.accept(nx);
     return false;
 }
 
+static bool endsWithReturn(Node *node)
+{
+    if (!node)
+        return false;
+    if (AST::cast<ReturnStatement *>(node))
+        return true;
+    if (AST::cast<ThrowStatement *>(node))
+        return true;
+    if (Program *p = AST::cast<Program *>(node))
+        return endsWithReturn(p->elements);
+    if (SourceElements *se = AST::cast<SourceElements *>(node)) {
+        while (se->next)
+            se = se->next;
+        return endsWithReturn(se->element);
+    }
+    if (StatementSourceElement *sse = AST::cast<StatementSourceElement *>(node))
+        return endsWithReturn(sse->statement);
+    if (StatementList *sl = AST::cast<StatementList *>(node)) {
+        while (sl->next)
+            sl = sl->next;
+        return endsWithReturn(sl->statement);
+    }
+    if (Block *b = AST::cast<Block *>(node))
+        return endsWithReturn(b->statements);
+    if (IfStatement *is = AST::cast<IfStatement *>(node))
+        return is->ko && endsWithReturn(is->ok) && endsWithReturn(is->ko);
+    return false;
+}
+
 int Codegen::defineFunction(const QString &name, AST::Node *ast,
                             AST::FormalParameterList *formals,
-                            AST::SourceElements *body,
-                            const QStringList &inheritedLocals)
-{
-    Loop *loop = 0;
-    qSwap(_loop, loop);
-    QStack<IR::BasicBlock *> exceptionHandlers;
-    qSwap(_exceptionHandlers, exceptionHandlers);
-
-    ScopeAndFinally *scopeAndFinally = 0;
-
-    enterEnvironment(ast);
-    IR::Function *function = _module->newFunction(name, _function);
-    int functionIndex = _module->functions.count() - 1;
-
-    IR::BasicBlock *entryBlock = function->newBasicBlock(0);
-    IR::BasicBlock *exitBlock = function->newBasicBlock(0, IR::Function::DontInsertBlock);
-    function->hasDirectEval = _variableEnvironment->hasDirectEval || _variableEnvironment->compilationMode == EvalCode
-            || _module->debugMode; // Conditional breakpoints are like eval in the function
-    function->usesArgumentsObject = _variableEnvironment->parent && (_variableEnvironment->usesArgumentsObject == Environment::ArgumentsObjectUsed);
-    function->usesThis = _variableEnvironment->usesThis;
-    function->maxNumberOfArguments = qMax(_variableEnvironment->maxNumberOfArguments, (int)QV4::Global::ReservedArgumentCount);
-    function->isStrict = _variableEnvironment->isStrict;
-    function->isNamedExpression = _variableEnvironment->isNamedFunctionExpression;
-    function->isQmlBinding = _variableEnvironment->compilationMode == QmlBinding;
-
-    AST::SourceLocation loc = ast->firstSourceLocation();
-    function->line = loc.startLine;
-    function->column = loc.startColumn;
-
-    if (function->usesArgumentsObject)
-        _variableEnvironment->enter(QStringLiteral("arguments"), Environment::VariableDeclaration, AST::VariableDeclaration::FunctionScope);
+                            AST::SourceElements *body)
+{
+    Q_UNUSED(formals);
+
+    enterContext(ast);
+
+    if (_context->functionIndex >= 0)
+        // already defined
+        return leaveContext();
+
+    _context->name = name;
+    _module->functions.append(_context);
+    _context->functionIndex = _module->functions.count() - 1;
+
+    _context->hasDirectEval |= (_context->compilationMode == EvalCode || _context->compilationMode == GlobalCode || _module->debugMode); // Conditional breakpoints are like eval in the function
+
+    BytecodeGenerator bytecode(_context->line, _module->debugMode);
+    BytecodeGenerator *savedBytecodeGenerator;
+    savedBytecodeGenerator = bytecodeGenerator;
+    bytecodeGenerator = &bytecode;
+    bytecodeGenerator->setLocation(ast->firstSourceLocation());
+
+    // reserve the js stack frame (Context & js Function & accumulator)
+    bytecodeGenerator->newRegisterArray(sizeof(CallData)/sizeof(Value) - 1 + _context->arguments.size());
+
+    int returnAddress = -1;
+    bool _requiresReturnValue = (_context->compilationMode == QmlBinding || _context->compilationMode == EvalCode || _context->compilationMode == GlobalCode);
+    qSwap(requiresReturnValue, _requiresReturnValue);
+    if (requiresReturnValue)
+        returnAddress = bytecodeGenerator->newRegister();
+    if (!_context->parent || _context->usesArgumentsObject == Context::ArgumentsObjectUnknown)
+        _context->usesArgumentsObject = Context::ArgumentsObjectNotUsed;
+    if (_context->usesArgumentsObject == Context::ArgumentsObjectUsed)
+        _context->addLocalVar(QStringLiteral("arguments"), Context::VariableDeclaration, AST::VariableDeclaration::FunctionScope);
+
+    bool allVarsEscape = _context->hasWith || _context->hasTry || _context->hasDirectEval;
+    if (_context->compilationMode == QmlBinding // we don't really need this for bindings, but we do for signal handlers, and we don't know if the code is a signal handler or not.
+            || (!_context->canUseSimpleCall() && _context->compilationMode != GlobalCode &&
+                (_context->compilationMode != EvalCode || _context->isStrict))) {
+        Instruction::CreateCallContext createContext;
+        bytecodeGenerator->addInstruction(createContext);
+    }
 
     // variables in global code are properties of the global context object, not locals as with other functions.
-    if (_variableEnvironment->compilationMode == FunctionCode || _variableEnvironment->compilationMode == QmlBinding) {
-        unsigned t = 0;
-        for (Environment::MemberMap::iterator it = _variableEnvironment->members.begin(), end = _variableEnvironment->members.end(); it != end; ++it) {
+    if (_context->compilationMode == FunctionCode || _context->compilationMode == QmlBinding) {
+        for (Context::MemberMap::iterator it = _context->members.begin(), end = _context->members.end(); it != end; ++it) {
             const QString &local = it.key();
-            function->LOCAL(local);
-            (*it).index = t;
-            entryBlock->MOVE(entryBlock->LOCAL(t, 0), entryBlock->CONST(IR::UndefinedType, 0));
-            ++t;
-        }
-    } else {
-        if (!_variableEnvironment->isStrict) {
-            for (const QString &inheritedLocal : qAsConst(inheritedLocals)) {
-                function->LOCAL(inheritedLocal);
-                unsigned tempIndex = entryBlock->newTemp();
-                Environment::Member member = { Environment::UndefinedMember,
-                                               static_cast<int>(tempIndex), 0,
-                                               AST::VariableDeclaration::VariableScope::FunctionScope };
-                _variableEnvironment->members.insert(inheritedLocal, member);
+            if (allVarsEscape)
+                it->canEscape = true;
+            if (it->canEscape) {
+                it->index = _context->locals.size();
+                _context->locals.append(local);
+                if (it->type == Context::ThisFunctionName) {
+                    // move the name from the stack to the call context
+                    Instruction::LoadReg load;
+                    load.reg = CallData::Function;
+                    bytecodeGenerator->addInstruction(load);
+                    Instruction::StoreLocal store;
+                    store.index = it->index;
+                    bytecodeGenerator->addInstruction(store);
+                }
+            } else {
+                if (it->type == Context::ThisFunctionName)
+                    it->index = CallData::Function;
+                else
+                    it->index = bytecodeGenerator->newRegister();
             }
         }
-
-        IR::ExprList *args = 0;
-        for (Environment::MemberMap::const_iterator it = _variableEnvironment->members.constBegin(), cend = _variableEnvironment->members.constEnd(); it != cend; ++it) {
+    } else {
+        for (Context::MemberMap::const_iterator it = _context->members.constBegin(), cend = _context->members.constEnd(); it != cend; ++it) {
             const QString &local = it.key();
-            IR::ExprList *next = function->New<IR::ExprList>();
-            next->expr = entryBlock->NAME(local, 0, 0);
-            next->next = args;
-            args = next;
-        }
-        if (args) {
-            IR::ExprList *next = function->New<IR::ExprList>();
-            next->expr = entryBlock->CONST(IR::BoolType, false); // ### Investigate removal of bool deletable
-            next->next = args;
-            args = next;
 
-            entryBlock->EXP(entryBlock->CALL(entryBlock->NAME(IR::Name::builtin_declare_vars, 0, 0), args));
+            Instruction::DeclareVar declareVar;
+            declareVar.isDeletable = false;
+            declareVar.varName = registerString(local);
+            bytecodeGenerator->addInstruction(declareVar);
         }
     }
 
-    unsigned returnAddress = entryBlock->newTemp();
-
-    entryBlock->MOVE(entryBlock->TEMP(returnAddress), entryBlock->CONST(IR::UndefinedType, 0));
-    setLocation(exitBlock->RET(exitBlock->TEMP(returnAddress)), ast->lastSourceLocation());
-
-    qSwap(_function, function);
-    qSwap(_block, entryBlock);
-    qSwap(_exitBlock, exitBlock);
     qSwap(_returnAddress, returnAddress);
-    qSwap(_scopeAndFinally, scopeAndFinally);
-
-    for (FormalParameterList *it = formals; it; it = it->next) {
-        _function->RECEIVE(it->name.toString());
-    }
-
-    for (const Environment::Member &member : qAsConst(_variableEnvironment->members)) {
+    for (const Context::Member &member : qAsConst(_context->members)) {
         if (member.function) {
             const int function = defineFunction(member.function->name.toString(), member.function, member.function->formals,
                                                 member.function->body ? member.function->body->elements : 0);
-            if (! _variableEnvironment->parent) {
-                move(_block->NAME(member.function->name.toString(), member.function->identifierToken.startLine, member.function->identifierToken.startColumn),
-                     _block->CLOSURE(function));
+            loadClosure(function);
+            if (! _context->parent) {
+                Reference::fromName(this, member.function->name.toString()).storeConsumeAccumulator();
             } else {
                 Q_ASSERT(member.index >= 0);
-                move(_block->LOCAL(member.index, 0), _block->CLOSURE(function));
+                Reference local = member.canEscape ? Reference::fromScopedLocal(this, member.index, 0)
+                                                   : Reference::fromStackSlot(this, member.index, true);
+                local.storeConsumeAccumulator();
             }
         }
     }
-    if (_function->usesArgumentsObject) {
-        move(identifier(QStringLiteral("arguments"), ast->firstSourceLocation().startLine, ast->firstSourceLocation().startColumn),
-             _block->CALL(_block->NAME(IR::Name::builtin_setup_argument_object,
-                     ast->firstSourceLocation().startLine, ast->firstSourceLocation().startColumn), 0));
+    if (_context->usesArgumentsObject == Context::ArgumentsObjectUsed) {
+        if (_context->isStrict) {
+            Instruction::CreateUnmappedArgumentsObject setup;
+            bytecodeGenerator->addInstruction(setup);
+        } else {
+            Instruction::CreateMappedArgumentsObject setup;
+            bytecodeGenerator->addInstruction(setup);
+        }
+        referenceForName(QStringLiteral("arguments"), false).storeConsumeAccumulator();
     }
-    if (_function->usesThis && !_function->isStrict) {
+    if (_context->usesThis && !_context->isStrict) {
         // make sure we convert this to an object
-        _block->EXP(_block->CALL(_block->NAME(IR::Name::builtin_convert_this_to_object,
-                ast->firstSourceLocation().startLine, ast->firstSourceLocation().startColumn), 0));
+        Instruction::ConvertThisToObject convert;
+        bytecodeGenerator->addInstruction(convert);
     }
 
     beginFunctionBodyHook();
 
     sourceElements(body);
 
-    _function->addBasicBlock(_exitBlock);
+    if (hasError || !endsWithReturn(body)) {
+        bytecodeGenerator->setLocation(ast->lastSourceLocation());
+        if (requiresReturnValue) {
+            if (_returnAddress >= 0) {
+                Instruction::LoadReg load;
+                load.reg = Moth::StackSlot::createRegister(_returnAddress);
+                bytecodeGenerator->addInstruction(load);
+            }
+        } else {
+            Reference::fromConst(this, Encode::undefined()).loadInAccumulator();
+        }
+        bytecodeGenerator->addInstruction(Instruction::Ret());
+    }
 
-    _block->JUMP(_exitBlock);
+    bytecodeGenerator->finalize(_context);
+    _context->registerCount = bytecodeGenerator->registerCount();
+    static const bool showCode = qEnvironmentVariableIsSet("QV4_SHOW_BYTECODE");
+    if (showCode) {
+        qDebug() << "=== Bytecode for" << _context->name << "strict mode" << _context->isStrict
+                 << "register count" << _context->registerCount;
+        QV4::Moth::dumpBytecode(_context->code, _context->locals.size(), _context->arguments.size(),
+                                _context->line, _context->lineNumberMapping);
+        qDebug();
+    }
 
-    qSwap(_function, function);
-    qSwap(_block, entryBlock);
-    qSwap(_exitBlock, exitBlock);
     qSwap(_returnAddress, returnAddress);
-    qSwap(_scopeAndFinally, scopeAndFinally);
-    qSwap(_exceptionHandlers, exceptionHandlers);
-    qSwap(_loop, loop);
-
-    leaveEnvironment();
+    qSwap(requiresReturnValue, _requiresReturnValue);
+    bytecodeGenerator = savedBytecodeGenerator;
 
-    return functionIndex;
+    return leaveContext();
 }
 
 bool Codegen::visit(FunctionSourceElement *ast)
@@ -2247,11 +2207,9 @@ bool Codegen::visit(Block *ast)
     if (hasError)
         return false;
 
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
-    for (StatementList *it = ast->statements; it; it = it->next) {
-        statement(it->statement);
-    }
+    statementList(ast->statements);
     return false;
 }
 
@@ -2260,27 +2218,22 @@ bool Codegen::visit(BreakStatement *ast)
     if (hasError)
         return false;
 
-    TempScope scope(_function);
-
-    if (!_loop) {
+    if (!_context->controlFlow) {
         throwSyntaxError(ast->lastSourceLocation(), QStringLiteral("Break outside of loop"));
         return false;
     }
-    Loop *loop = 0;
-    if (ast->label.isEmpty())
-        loop = _loop;
-    else {
-        for (loop = _loop; loop; loop = loop->parent) {
-            if (loop->labelledStatement && loop->labelledStatement->label == ast->label)
-                break;
-        }
-        if (!loop) {
+
+    ControlFlow::Handler h = _context->controlFlow->getHandler(ControlFlow::Break, ast->label.toString());
+    if (h.type == ControlFlow::Invalid) {
+        if (ast->label.isEmpty())
+            throwSyntaxError(ast->lastSourceLocation(), QStringLiteral("Break outside of loop"));
+        else
             throwSyntaxError(ast->lastSourceLocation(), QStringLiteral("Undefined label '%1'").arg(ast->label.toString()));
-            return false;
-        }
+        return false;
     }
-    unwindException(loop->scopeAndFinally);
-    _block->JUMP(loop->breakBlock);
+
+    _context->controlFlow->jumpToHandler(h);
+
     return false;
 }
 
@@ -2289,33 +2242,24 @@ bool Codegen::visit(ContinueStatement *ast)
     if (hasError)
         return false;
 
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
-    Loop *loop = 0;
-    if (ast->label.isEmpty()) {
-        for (loop = _loop; loop; loop = loop->parent) {
-            if (loop->continueBlock)
-                break;
-        }
-    } else {
-        for (loop = _loop; loop; loop = loop->parent) {
-            if (loop->labelledStatement && loop->labelledStatement->label == ast->label) {
-                if (!loop->continueBlock)
-                    loop = 0;
-                break;
-            }
-        }
-        if (!loop) {
-            throwSyntaxError(ast->lastSourceLocation(), QStringLiteral("Undefined label '%1'").arg(ast->label.toString()));
-            return false;
-        }
+    if (!_context->controlFlow) {
+        throwSyntaxError(ast->lastSourceLocation(), QStringLiteral("Continue outside of loop"));
+        return false;
     }
-    if (!loop) {
-        throwSyntaxError(ast->lastSourceLocation(), QStringLiteral("continue outside of loop"));
+
+    ControlFlow::Handler h = _context->controlFlow->getHandler(ControlFlow::Continue, ast->label.toString());
+    if (h.type == ControlFlow::Invalid) {
+        if (ast->label.isEmpty())
+            throwSyntaxError(ast->lastSourceLocation(), QStringLiteral("Undefined label '%1'").arg(ast->label.toString()));
+        else
+            throwSyntaxError(ast->lastSourceLocation(), QStringLiteral("continue outside of loop"));
         return false;
     }
-    unwindException(loop->scopeAndFinally);
-    _block->JUMP(loop->continueBlock);
+
+    _context->controlFlow->jumpToHandler(h);
+
     return false;
 }
 
@@ -2330,26 +2274,27 @@ bool Codegen::visit(DoWhileStatement *ast)
     if (hasError)
         return true;
 
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
-    IR::BasicBlock *loopbody = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *loopcond = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *loopend = _function->newBasicBlock(exceptionHandler());
+    BytecodeGenerator::Label body = bytecodeGenerator->label();
+    BytecodeGenerator::Label cond = bytecodeGenerator->newLabel();
+    BytecodeGenerator::Label end = bytecodeGenerator->newLabel();
 
-    enterLoop(ast, loopend, loopcond);
+    ControlFlowLoop flow(this, &end, &cond);
 
-    _block->JUMP(loopbody);
-
-    _block = loopbody;
     statement(ast->statement);
-    setJumpOutLocation(_block->JUMP(loopcond), ast->statement, ast->semicolonToken);
+    setJumpOutLocation(bytecodeGenerator, ast->statement, ast->semicolonToken);
 
-    _block = loopcond;
-    condition(ast->expression, loopbody, loopend);
+    cond.link();
 
-    _block = loopend;
+    if (!AST::cast<FalseLiteral *>(ast->expression)) {
+        if (AST::cast<TrueLiteral *>(ast->expression))
+            bytecodeGenerator->jump().link(body);
+        else
+            condition(ast->expression, &body, &end, false);
+    }
 
-    leaveLoop();
+    end.link();
 
     return false;
 }
@@ -2367,12 +2312,13 @@ bool Codegen::visit(ExpressionStatement *ast)
     if (hasError)
         return true;
 
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
-    if (_variableEnvironment->compilationMode == EvalCode || _variableEnvironment->compilationMode == QmlBinding) {
-        Result e = expression(ast->expression);
-        if (*e)
-            move(_block->TEMP(_returnAddress), *e);
+    if (requiresReturnValue) {
+        Reference e = expression(ast->expression);
+        if (hasError)
+            return false;
+        (void) e.storeOnStack(_returnAddress);
     } else {
         statement(ast->expression);
     }
@@ -2384,46 +2330,44 @@ bool Codegen::visit(ForEachStatement *ast)
     if (hasError)
         return true;
 
-    TempScope scope(_function);
-
-    IR::BasicBlock *foreachin = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *foreachbody = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *foreachend = _function->newBasicBlock(exceptionHandler());
+    RegisterScope scope(this);
 
-    int objectToIterateOn = _block->newTemp();
-    Result expr = expression(ast->expression);
+    Reference obj = Reference::fromStackSlot(this);
+    Reference expr = expression(ast->expression);
     if (hasError)
-        return false;
-    move(_block->TEMP(objectToIterateOn), *expr);
-    IR::ExprList *args = _function->New<IR::ExprList>();
-    args->init(_block->TEMP(objectToIterateOn));
+        return true;
 
-    int iterator = _block->newTemp();
-    move(_block->TEMP(iterator), _block->CALL(_block->NAME(IR::Name::builtin_foreach_iterator_object, 0, 0), args));
+    expr.loadInAccumulator();
+    Instruction::ForeachIteratorObject iteratorObjInstr;
+    bytecodeGenerator->addInstruction(iteratorObjInstr);
+    obj.storeConsumeAccumulator();
 
-    enterLoop(ast, foreachend, foreachin);
-    _block->JUMP(foreachin);
+    BytecodeGenerator::Label in = bytecodeGenerator->newLabel();
+    BytecodeGenerator::Label end = bytecodeGenerator->newLabel();
+
+    bytecodeGenerator->jump().link(in);
+
+    ControlFlowLoop flow(this, &end, &in);
+
+    BytecodeGenerator::Label body = bytecodeGenerator->label();
 
-    _block = foreachbody;
-    int temp = _block->newTemp();
-    Result init = expression(ast->initialiser);
-    if (hasError)
-        return false;
-    move(*init, _block->TEMP(temp));
     statement(ast->statement);
-    setJumpOutLocation(_block->JUMP(foreachin), ast->statement, ast->forToken);
+    setJumpOutLocation(bytecodeGenerator, ast->statement, ast->forToken);
+
+    in.link();
+
+    Reference lhs = expression(ast->initialiser).asLValue();
 
-    _block = foreachin;
+    obj.loadInAccumulator();
+    Instruction::ForeachNextPropertyName nextPropInstr;
+    bytecodeGenerator->addInstruction(nextPropInstr);
+    lhs = lhs.storeRetainAccumulator().storeOnStack();
 
-    args = _function->New<IR::ExprList>();
-    args->init(_block->TEMP(iterator));
-    move(_block->TEMP(temp), _block->CALL(_block->NAME(IR::Name::builtin_foreach_next_property_name, 0, 0), args));
-    int null = _block->newTemp();
-    move(_block->TEMP(null), _block->CONST(IR::NullType, 0));
-    setLocation(cjump(_block->BINOP(IR::OpStrictNotEqual, _block->TEMP(temp), _block->TEMP(null)), foreachbody, foreachend), ast->forToken);
-    _block = foreachend;
+    Reference::fromConst(this, QV4::Encode::null()).loadInAccumulator();
+    bytecodeGenerator->jumpStrictNotEqual(lhs.stackSlot(), body);
+
+    end.link();
 
-    leaveLoop();
     return false;
 }
 
@@ -2432,35 +2376,28 @@ bool Codegen::visit(ForStatement *ast)
     if (hasError)
         return true;
 
-    TempScope scope(_function);
-
-    IR::BasicBlock *forcond = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *forbody = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *forstep = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *forend = _function->newBasicBlock(exceptionHandler());
+    RegisterScope scope(this);
 
     statement(ast->initialiser);
-    _block->JUMP(forcond);
 
-    enterLoop(ast, forend, forstep);
+    BytecodeGenerator::Label cond = bytecodeGenerator->label();
+    BytecodeGenerator::Label body = bytecodeGenerator->newLabel();
+    BytecodeGenerator::Label step = bytecodeGenerator->newLabel();
+    BytecodeGenerator::Label end = bytecodeGenerator->newLabel();
 
-    _block = forcond;
-    if (ast->condition)
-        condition(ast->condition, forbody, forend);
-    else
-        _block->JUMP(forbody);
+    ControlFlowLoop flow(this, &end, &step);
+
+    condition(ast->condition, &body, &end, true);
 
-    _block = forbody;
+    body.link();
     statement(ast->statement);
-    setJumpOutLocation(_block->JUMP(forstep), ast->statement, ast->forToken);
+    setJumpOutLocation(bytecodeGenerator, ast->statement, ast->forToken);
 
-    _block = forstep;
+    step.link();
     statement(ast->expression);
-    _block->JUMP(forcond);
+    bytecodeGenerator->jump().link(cond);
 
-    _block = forend;
-
-    leaveLoop();
+    end.link();
 
     return false;
 }
@@ -2470,26 +2407,28 @@ bool Codegen::visit(IfStatement *ast)
     if (hasError)
         return true;
 
-    TempScope scope(_function);
-
-    IR::BasicBlock *iftrue = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *iffalse = ast->ko ? _function->newBasicBlock(exceptionHandler()) : 0;
-    IR::BasicBlock *endif = _function->newBasicBlock(exceptionHandler());
+    RegisterScope scope(this);
 
-    condition(ast->expression, iftrue, ast->ko ? iffalse : endif);
+    BytecodeGenerator::Label trueLabel = bytecodeGenerator->newLabel();
+    BytecodeGenerator::Label falseLabel = bytecodeGenerator->newLabel();
+    condition(ast->expression, &trueLabel, &falseLabel, true);
 
-    _block = iftrue;
+    trueLabel.link();
     statement(ast->ok);
-    setJumpOutLocation(_block->JUMP(endif), ast->ok, ast->ifToken);
-
     if (ast->ko) {
-        _block = iffalse;
-        statement(ast->ko);
-        setJumpOutLocation(_block->JUMP(endif), ast->ko, ast->elseToken);
+        if (endsWithReturn(ast)) {
+            falseLabel.link();
+            statement(ast->ko);
+        } else {
+            BytecodeGenerator::Jump jump_endif = bytecodeGenerator->jump();
+            falseLabel.link();
+            statement(ast->ko);
+            jump_endif.link();
+        }
+    } else {
+        falseLabel.link();
     }
 
-    _block = endif;
-
     return false;
 }
 
@@ -2498,12 +2437,12 @@ bool Codegen::visit(LabelledStatement *ast)
     if (hasError)
         return true;
 
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
     // check that no outer loop contains the label
-    Loop *l = _loop;
+    ControlFlow *l = _context->controlFlow;
     while (l) {
-        if (l->labelledStatement && l->labelledStatement->label == ast->label) {
+        if (l->label() == ast->label) {
             QString error = QString(QStringLiteral("Label '%1' has already been declared")).arg(ast->label.toString());
             throwSyntaxError(ast->firstSourceLocation(), error);
             return false;
@@ -2521,12 +2460,10 @@ bool Codegen::visit(LabelledStatement *ast)
             AST::cast<AST::LocalForEachStatement *>(ast->statement)) {
         statement(ast->statement); // labelledStatement will be associated with the ast->statement's loop.
     } else {
-        IR::BasicBlock *breakBlock = _function->newBasicBlock(exceptionHandler());
-        enterLoop(ast->statement, breakBlock, /*continueBlock*/ 0);
+        BytecodeGenerator::Label breakLabel = bytecodeGenerator->newLabel();
+        ControlFlowLoop flow(this, &breakLabel);
         statement(ast->statement);
-        _block->JUMP(breakBlock);
-        _block = breakBlock;
-        leaveLoop();
+        breakLabel.link();
     }
 
     return false;
@@ -2537,40 +2474,44 @@ bool Codegen::visit(LocalForEachStatement *ast)
     if (hasError)
         return true;
 
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
-    IR::BasicBlock *foreachin = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *foreachbody = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *foreachend = _function->newBasicBlock(exceptionHandler());
+    Reference obj = Reference::fromStackSlot(this);
+    Reference expr = expression(ast->expression);
+    if (hasError)
+        return true;
 
     variableDeclaration(ast->declaration);
 
-    int iterator = _block->newTemp();
-    move(_block->TEMP(iterator), *expression(ast->expression));
-    IR::ExprList *args = _function->New<IR::ExprList>();
-    args->init(_block->TEMP(iterator));
-    move(_block->TEMP(iterator), _block->CALL(_block->NAME(IR::Name::builtin_foreach_iterator_object, 0, 0), args));
+    expr.loadInAccumulator();
+    Instruction::ForeachIteratorObject iteratorObjInstr;
+    bytecodeGenerator->addInstruction(iteratorObjInstr);
+    obj.storeConsumeAccumulator();
+
+    BytecodeGenerator::Label in = bytecodeGenerator->newLabel();
+    BytecodeGenerator::Label end = bytecodeGenerator->newLabel();
 
-    _block->JUMP(foreachin);
-    enterLoop(ast, foreachend, foreachin);
+    bytecodeGenerator->jump().link(in);
+    ControlFlowLoop flow(this, &end, &in);
 
-    _block = foreachbody;
-    int temp = _block->newTemp();
-    move(identifier(ast->declaration->name.toString()), _block->TEMP(temp));
+    BytecodeGenerator::Label body = bytecodeGenerator->label();
+
+    Reference it = referenceForName(ast->declaration->name.toString(), true).asLValue();
     statement(ast->statement);
-    setJumpOutLocation(_block->JUMP(foreachin), ast->statement, ast->forToken);
+    setJumpOutLocation(bytecodeGenerator, ast->statement, ast->forToken);
+
+    in.link();
 
-    _block = foreachin;
+    obj.loadInAccumulator();
+    Instruction::ForeachNextPropertyName nextPropInstr;
+    bytecodeGenerator->addInstruction(nextPropInstr);
+    auto lhs = it.storeRetainAccumulator().storeOnStack();
 
-    args = _function->New<IR::ExprList>();
-    args->init(_block->TEMP(iterator));
-    move(_block->TEMP(temp), _block->CALL(_block->NAME(IR::Name::builtin_foreach_next_property_name, 0, 0), args));
-    int null = _block->newTemp();
-    move(_block->TEMP(null), _block->CONST(IR::NullType, 0));
-    setLocation(cjump(_block->BINOP(IR::OpStrictNotEqual, _block->TEMP(temp), _block->TEMP(null)), foreachbody, foreachend), ast->forToken);
-    _block = foreachend;
+    Reference::fromConst(this, QV4::Encode::null()).loadInAccumulator();
+    bytecodeGenerator->jumpStrictNotEqual(lhs.stackSlot(), body);
+
+    end.link();
 
-    leaveLoop();
     return false;
 }
 
@@ -2579,35 +2520,27 @@ bool Codegen::visit(LocalForStatement *ast)
     if (hasError)
         return true;
 
-    TempScope scope(_function);
-
-    IR::BasicBlock *forcond = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *forbody = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *forstep = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *forend = _function->newBasicBlock(exceptionHandler());
+    RegisterScope scope(this);
 
     variableDeclarationList(ast->declarations);
-    _block->JUMP(forcond);
 
-    enterLoop(ast, forend, forstep);
+    BytecodeGenerator::Label cond = bytecodeGenerator->label();
+    BytecodeGenerator::Label body = bytecodeGenerator->newLabel();
+    BytecodeGenerator::Label step = bytecodeGenerator->newLabel();
+    BytecodeGenerator::Label end = bytecodeGenerator->newLabel();
 
-    _block = forcond;
-    if (ast->condition)
-        condition(ast->condition, forbody, forend);
-    else
-        _block->JUMP(forbody);
+    ControlFlowLoop flow(this, &end, &step);
+
+    condition(ast->condition, &body, &end, true);
 
-    _block = forbody;
+    body.link();
     statement(ast->statement);
-    setJumpOutLocation(_block->JUMP(forstep), ast->statement, ast->forToken);
+    setJumpOutLocation(bytecodeGenerator, ast->statement, ast->forToken);
 
-    _block = forstep;
+    step.link();
     statement(ast->expression);
-    _block->JUMP(forcond);
-
-    _block = forend;
-
-    leaveLoop();
+    bytecodeGenerator->jump().link(cond);
+    end.link();
 
     return false;
 }
@@ -2617,24 +2550,30 @@ bool Codegen::visit(ReturnStatement *ast)
     if (hasError)
         return true;
 
-    if (_variableEnvironment->compilationMode != FunctionCode && _variableEnvironment->compilationMode != QmlBinding) {
+    if (_context->compilationMode != FunctionCode && _context->compilationMode != QmlBinding) {
         throwSyntaxError(ast->returnToken, QStringLiteral("Return statement outside of function"));
         return false;
     }
+    Reference expr;
     if (ast->expression) {
-        Result expr = expression(ast->expression);
-        move(_block->TEMP(_returnAddress), *expr);
+         expr = expression(ast->expression);
+        if (hasError)
+            return false;
+    } else {
+        expr = Reference::fromConst(this, Encode::undefined());
     }
 
-    // Since we're leaving, don't let any finally statements we emit as part of the unwinding
-    // jump to exception handlers at run-time if they throw.
-    IR::BasicBlock *unwindBlock = _function->newBasicBlock(/*no exception handler*/nullptr);
-    _block->JUMP(unwindBlock);
-    _block = unwindBlock;
-
-    unwindException(0);
-
-    _block->JUMP(_exitBlock);
+    if (_context->controlFlow && _context->controlFlow->returnRequiresUnwind()) {
+        if (_returnAddress >= 0)
+            (void) expr.storeOnStack(_returnAddress);
+        else
+            expr.loadInAccumulator();
+        ControlFlow::Handler h = _context->controlFlow->getHandler(ControlFlow::Return);
+        _context->controlFlow->jumpToHandler(h);
+    } else {
+        expr.loadInAccumulator();
+        bytecodeGenerator->addInstruction(Instruction::Ret());
+    }
     return false;
 }
 
@@ -2643,245 +2582,151 @@ bool Codegen::visit(SwitchStatement *ast)
     if (hasError)
         return true;
 
-    TempScope scope(_function);
-
-    IR::BasicBlock *switchend = _function->newBasicBlock(exceptionHandler());
+    RegisterScope scope(this);
 
     if (ast->block) {
-        int lhs = _block->newTemp();
-        move(_block->TEMP(lhs), *expression(ast->expression));
-        IR::BasicBlock *switchcond = _function->newBasicBlock(exceptionHandler());
-        _block->JUMP(switchcond);
-        IR::BasicBlock *previousBlock = 0;
-
-        QHash<Node *, IR::BasicBlock *> blockMap;
-
-        enterLoop(ast, switchend, 0);
+        BytecodeGenerator::Label switchEnd = bytecodeGenerator->newLabel();
 
+        Reference lhs = expression(ast->expression);
+        if (hasError)
+            return false;
+        lhs = lhs.storeOnStack();
+
+        // set up labels for all clauses
+        QHash<Node *, BytecodeGenerator::Label> blockMap;
+        for (CaseClauses *it = ast->block->clauses; it; it = it->next)
+            blockMap[it->clause] = bytecodeGenerator->newLabel();
+        if (ast->block->defaultClause)
+            blockMap[ast->block->defaultClause] = bytecodeGenerator->newLabel();
+        for (CaseClauses *it = ast->block->moreClauses; it; it = it->next)
+            blockMap[it->clause] = bytecodeGenerator->newLabel();
+
+        // do the switch conditions
         for (CaseClauses *it = ast->block->clauses; it; it = it->next) {
             CaseClause *clause = it->clause;
-
-            _block = _function->newBasicBlock(exceptionHandler());
-            blockMap[clause] = _block;
-
-            if (previousBlock && !previousBlock->isTerminated())
-                previousBlock->JUMP(_block);
-
-            for (StatementList *it2 = clause->statements; it2; it2 = it2->next)
-                statement(it2->statement);
-
-            previousBlock = _block;
-        }
-
-        if (ast->block->defaultClause) {
-            _block = _function->newBasicBlock(exceptionHandler());
-            blockMap[ast->block->defaultClause] = _block;
-
-            if (previousBlock && !previousBlock->isTerminated())
-                previousBlock->JUMP(_block);
-
-            for (StatementList *it2 = ast->block->defaultClause->statements; it2; it2 = it2->next)
-                statement(it2->statement);
-
-            previousBlock = _block;
+            Reference rhs = expression(clause->expression);
+            if (hasError)
+                return false;
+            rhs.loadInAccumulator();
+            bytecodeGenerator->jumpStrictEqual(lhs.stackSlot(), blockMap.value(clause));
         }
 
         for (CaseClauses *it = ast->block->moreClauses; it; it = it->next) {
             CaseClause *clause = it->clause;
+            Reference rhs = expression(clause->expression);
+            if (hasError)
+                return false;
+            rhs.loadInAccumulator();
+            bytecodeGenerator->jumpStrictEqual(lhs.stackSlot(), blockMap.value(clause));
+        }
 
-            _block = _function->newBasicBlock(exceptionHandler());
-            blockMap[clause] = _block;
+        if (DefaultClause *defaultClause = ast->block->defaultClause)
+            bytecodeGenerator->jump().link(blockMap.value(defaultClause));
+        else
+            bytecodeGenerator->jump().link(switchEnd);
 
-            if (previousBlock && !previousBlock->isTerminated())
-                previousBlock->JUMP(_block);
+        ControlFlowLoop flow(this, &switchEnd);
 
-            for (StatementList *it2 = clause->statements; it2; it2 = it2->next)
-                statement(it2->statement);
+        for (CaseClauses *it = ast->block->clauses; it; it = it->next) {
+            CaseClause *clause = it->clause;
+            blockMap[clause].link();
 
-            previousBlock = _block;
+            statementList(clause->statements);
         }
 
-        leaveLoop();
-
-        _block->JUMP(switchend);
+        if (ast->block->defaultClause) {
+            DefaultClause *clause = ast->block->defaultClause;
+            blockMap[clause].link();
 
-        _block = switchcond;
-        for (CaseClauses *it = ast->block->clauses; it; it = it->next) {
-            CaseClause *clause = it->clause;
-            Result rhs = expression(clause->expression);
-            IR::BasicBlock *iftrue = blockMap[clause];
-            IR::BasicBlock *iffalse = _function->newBasicBlock(exceptionHandler());
-            setLocation(cjump(binop(IR::OpStrictEqual, _block->TEMP(lhs), *rhs), iftrue, iffalse), clause->caseToken);
-            _block = iffalse;
+            statementList(clause->statements);
         }
 
         for (CaseClauses *it = ast->block->moreClauses; it; it = it->next) {
             CaseClause *clause = it->clause;
-            Result rhs = expression(clause->expression);
-            IR::BasicBlock *iftrue = blockMap[clause];
-            IR::BasicBlock *iffalse = _function->newBasicBlock(exceptionHandler());
-            setLocation(cjump(binop(IR::OpStrictEqual, _block->TEMP(lhs), *rhs), iftrue, iffalse), clause->caseToken);
-            _block = iffalse;
-        }
+            blockMap[clause].link();
 
-        if (DefaultClause *defaultClause = ast->block->defaultClause) {
-            setLocation(_block->JUMP(blockMap[ast->block->defaultClause]), defaultClause->defaultToken);
+            statementList(clause->statements);
         }
-    }
 
-    _block->JUMP(switchend);
+        switchEnd.link();
+
+    }
 
-    _block = switchend;
     return false;
 }
 
 bool Codegen::visit(ThrowStatement *ast)
 {
     if (hasError)
-        return true;
+        return false;
+
+    RegisterScope scope(this);
 
-    TempScope scope(_function);
+    Reference expr = expression(ast->expression);
+    if (hasError)
+        return false;
 
-    Result expr = expression(ast->expression);
-    move(_block->TEMP(_returnAddress), *expr);
-    IR::ExprList *throwArgs = _function->New<IR::ExprList>();
-    throwArgs->expr = _block->TEMP(_returnAddress);
-    _block->EXP(_block->CALL(_block->NAME(IR::Name::builtin_throw, /*line*/0, /*column*/0), throwArgs));
+    if (_context->controlFlow) {
+        _context->controlFlow->handleThrow(expr);
+    } else {
+        expr.loadInAccumulator();
+        Instruction::ThrowException instr;
+        bytecodeGenerator->addInstruction(instr);
+    }
     return false;
 }
 
-bool Codegen::visit(TryStatement *ast)
+void Codegen::handleTryCatch(TryStatement *ast)
 {
-    if (hasError)
-        return true;
-
-    TempScope scope(_function);
-
-    _function->hasTry = true;
-
-    if (_function->isStrict && ast->catchExpression &&
-            (ast->catchExpression->name == QLatin1String("eval") || ast->catchExpression->name == QLatin1String("arguments"))) {
+    Q_ASSERT(ast);
+    if (_context->isStrict &&
+        (ast->catchExpression->name == QLatin1String("eval") || ast->catchExpression->name == QLatin1String("arguments"))) {
         throwSyntaxError(ast->catchExpression->identifierToken, QStringLiteral("Catch variable name may not be eval or arguments in strict mode"));
-        return false;
+        return;
     }
 
-    IR::BasicBlock *surroundingExceptionHandler = exceptionHandler();
-
-    // We always need a finally body to clean up the exception handler
-    // exceptions thrown in finally get caught by the surrounding catch block
-    IR::BasicBlock *finallyBody = 0;
-    IR::BasicBlock *catchBody = 0;
-    IR::BasicBlock *catchExceptionHandler = 0;
-    IR::BasicBlock *end = _function->newBasicBlock(surroundingExceptionHandler, IR::Function::DontInsertBlock);
-
-    if (ast->finallyExpression)
-        finallyBody = _function->newBasicBlock(surroundingExceptionHandler, IR::Function::DontInsertBlock);
-
-    if (ast->catchExpression) {
-        // exception handler for the catch body
-        catchExceptionHandler = _function->newBasicBlock(0, IR::Function::DontInsertBlock);
-        pushExceptionHandler(catchExceptionHandler);
-        catchBody =  _function->newBasicBlock(catchExceptionHandler, IR::Function::DontInsertBlock);
-        popExceptionHandler();
-        pushExceptionHandler(catchBody);
-    } else {
-        Q_ASSERT(finallyBody);
-        pushExceptionHandler(finallyBody);
+    RegisterScope scope(this);
+    BytecodeGenerator::Label noException = bytecodeGenerator->newLabel();
+    {
+        ControlFlowCatch catchFlow(this, ast->catchExpression);
+        RegisterScope scope(this);
+        statement(ast->statement);
+        bytecodeGenerator->jump().link(noException);
     }
+    noException.link();
+}
 
-    IR::BasicBlock *tryBody = _function->newBasicBlock(exceptionHandler());
-    _block->JUMP(tryBody);
-
-    ScopeAndFinally tcf(_scopeAndFinally, ast->finallyExpression);
-    _scopeAndFinally = &tcf;
-
-    _block = tryBody;
-    statement(ast->statement);
-    _block->JUMP(finallyBody ? finallyBody : end);
-
-    popExceptionHandler();
+void Codegen::handleTryFinally(TryStatement *ast)
+{
+    RegisterScope scope(this);
+    ControlFlowFinally finally(this, ast->finallyExpression);
 
     if (ast->catchExpression) {
-        pushExceptionHandler(catchExceptionHandler);
-        _function->addBasicBlock(catchBody);
-        _block = catchBody;
-
-        ++_function->insideWithOrCatch;
-        IR::ExprList *catchArgs = _function->New<IR::ExprList>();
-        catchArgs->init(_block->STRING(_function->newString(ast->catchExpression->name.toString())));
-        _block->EXP(_block->CALL(_block->NAME(IR::Name::builtin_push_catch_scope, 0, 0), catchArgs));
-        {
-            ScopeAndFinally scope(_scopeAndFinally, ScopeAndFinally::CatchScope);
-            _scopeAndFinally = &scope;
-            statement(ast->catchExpression->statement);
-            _scopeAndFinally = scope.parent;
-        }
-        _block->EXP(_block->CALL(_block->NAME(IR::Name::builtin_pop_scope, 0, 0), 0));
-        --_function->insideWithOrCatch;
-        _block->JUMP(finallyBody ? finallyBody : end);
-        popExceptionHandler();
-
-        _function->addBasicBlock(catchExceptionHandler);
-        catchExceptionHandler->EXP(catchExceptionHandler->CALL(catchExceptionHandler->NAME(IR::Name::builtin_pop_scope, 0, 0), 0));
-        if (finallyBody || surroundingExceptionHandler)
-            catchExceptionHandler->JUMP(finallyBody ? finallyBody : surroundingExceptionHandler);
-        else
-            catchExceptionHandler->EXP(catchExceptionHandler->CALL(catchExceptionHandler->NAME(IR::Name::builtin_rethrow, 0, 0), 0));
+        handleTryCatch(ast);
+    } else {
+        RegisterScope scope(this);
+        statement(ast->statement);
     }
+}
 
-    _scopeAndFinally = tcf.parent;
-
-    if (finallyBody) {
-        _function->addBasicBlock(finallyBody);
-        _block = finallyBody;
-
-        TempScope scope(_function);
+bool Codegen::visit(TryStatement *ast)
+{
+    if (hasError)
+        return true;
 
-        int hasException = _block->newTemp();
-        move(_block->TEMP(hasException), _block->CALL(_block->NAME(IR::Name::builtin_unwind_exception, /*line*/0, /*column*/0), 0));
+    Q_ASSERT(_context->hasTry);
 
-        if (ast->finallyExpression && ast->finallyExpression->statement)
-            statement(ast->finallyExpression->statement);
+    RegisterScope scope(this);
 
-        IR::ExprList *arg = _function->New<IR::ExprList>();
-        arg->expr = _block->TEMP(hasException);
-        _block->EXP(_block->CALL(_block->NAME(IR::Name::builtin_throw, /*line*/0, /*column*/0), arg));
-        _block->JUMP(end);
+    if (ast->finallyExpression && ast->finallyExpression->statement) {
+        handleTryFinally(ast);
+    } else {
+        handleTryCatch(ast);
     }
 
-    _function->addBasicBlock(end);
-    _block = end;
-
     return false;
 }
 
-void Codegen::unwindException(Codegen::ScopeAndFinally *outest)
-{
-    int savedDepthForWidthOrCatch = _function->insideWithOrCatch;
-    ScopeAndFinally *scopeAndFinally = _scopeAndFinally;
-    qSwap(_scopeAndFinally, scopeAndFinally);
-    while (_scopeAndFinally != outest) {
-        switch (_scopeAndFinally->type) {
-        case ScopeAndFinally::WithScope:
-            // fall through
-        case ScopeAndFinally::CatchScope:
-            _block->EXP(_block->CALL(_block->NAME(IR::Name::builtin_pop_scope, 0, 0)));
-            _scopeAndFinally = _scopeAndFinally->parent;
-            --_function->insideWithOrCatch;
-            break;
-        case ScopeAndFinally::TryScope: {
-            ScopeAndFinally *tc = _scopeAndFinally;
-            _scopeAndFinally = tc->parent;
-            if (tc->finally && tc->finally->statement)
-                statement(tc->finally->statement);
-            break;
-        }
-        }
-    }
-    qSwap(_scopeAndFinally, scopeAndFinally);
-    _function->insideWithOrCatch = savedDepthForWidthOrCatch;
-}
-
 bool Codegen::visit(VariableStatement *ast)
 {
     if (hasError)
@@ -2896,23 +2741,25 @@ bool Codegen::visit(WhileStatement *ast)
     if (hasError)
         return true;
 
-    IR::BasicBlock *whilecond = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *whilebody = _function->newBasicBlock(exceptionHandler());
-    IR::BasicBlock *whileend = _function->newBasicBlock(exceptionHandler());
+    if (AST::cast<FalseLiteral *>(ast->expression))
+        return false;
 
-    enterLoop(ast, whileend, whilecond);
+    RegisterScope scope(this);
 
-    _block->JUMP(whilecond);
-    _block = whilecond;
-    condition(ast->expression, whilebody, whileend);
+    BytecodeGenerator::Label start = bytecodeGenerator->newLabel();
+    BytecodeGenerator::Label end = bytecodeGenerator->newLabel();
+    BytecodeGenerator::Label cond = bytecodeGenerator->label();
+    ControlFlowLoop flow(this, &end, &cond);
 
-    _block = whilebody;
-    statement(ast->statement);
-    setJumpOutLocation(_block->JUMP(whilecond), ast->statement, ast->whileToken);
+    if (!AST::cast<TrueLiteral *>(ast->expression))
+        condition(ast->expression, &start, &end, true);
 
-    _block = whileend;
-    leaveLoop();
+    start.link();
+    statement(ast->statement);
+    setJumpOutLocation(bytecodeGenerator, ast->statement, ast->whileToken);
+    bytecodeGenerator->jump().link(cond);
 
+    end.link();
     return false;
 }
 
@@ -2921,103 +2768,75 @@ bool Codegen::visit(WithStatement *ast)
     if (hasError)
         return true;
 
-    TempScope scope(_function);
+    RegisterScope scope(this);
 
-    _function->hasWith = true;
+    _context->hasWith = true;
 
-    const int withObject = _block->newTemp();
-    Result src = expression(ast->expression);
+    Reference src = expression(ast->expression);
     if (hasError)
         return false;
-    _block->MOVE(_block->TEMP(withObject), *src);
-
-    // need an exception handler for with to cleanup the with scope
-    IR::BasicBlock *withExceptionHandler = _function->newBasicBlock(exceptionHandler());
-    withExceptionHandler->EXP(withExceptionHandler->CALL(withExceptionHandler->NAME(IR::Name::builtin_pop_scope, 0, 0), 0));
-    if (!exceptionHandler())
-        withExceptionHandler->EXP(withExceptionHandler->CALL(withExceptionHandler->NAME(IR::Name::builtin_rethrow, 0, 0), 0));
-    else
-        withExceptionHandler->JUMP(exceptionHandler());
-
-    pushExceptionHandler(withExceptionHandler);
-
-    IR::BasicBlock *withBlock = _function->newBasicBlock(exceptionHandler());
+    src = src.storeOnStack(); // trigger load before we setup the exception handler, so exceptions here go to the right place
+    src.loadInAccumulator();
 
-    _block->JUMP(withBlock);
-    _block = withBlock;
-    IR::ExprList *args = _function->New<IR::ExprList>();
-    args->init(_block->TEMP(withObject));
-    _block->EXP(_block->CALL(_block->NAME(IR::Name::builtin_push_with_scope, 0, 0), args));
+    ControlFlowWith flow(this);
 
-    ++_function->insideWithOrCatch;
-    {
-        ScopeAndFinally scope(_scopeAndFinally);
-        _scopeAndFinally = &scope;
-        statement(ast->statement);
-        _scopeAndFinally = scope.parent;
-    }
-    --_function->insideWithOrCatch;
-    _block->EXP(_block->CALL(_block->NAME(IR::Name::builtin_pop_scope, 0, 0), 0));
-    popExceptionHandler();
-
-    IR::BasicBlock *next = _function->newBasicBlock(exceptionHandler());
-    _block->JUMP(next);
-    _block = next;
+    statement(ast->statement);
 
     return false;
 }
 
 bool Codegen::visit(UiArrayBinding *)
 {
-    Q_ASSERT(!"not implemented");
+    Q_UNIMPLEMENTED();
     return false;
 }
 
 bool Codegen::visit(UiObjectBinding *)
 {
-    Q_ASSERT(!"not implemented");
+    Q_UNIMPLEMENTED();
     return false;
 }
 
 bool Codegen::visit(UiObjectDefinition *)
 {
-    Q_ASSERT(!"not implemented");
+    Q_UNIMPLEMENTED();
     return false;
 }
 
 bool Codegen::visit(UiPublicMember *)
 {
-    Q_ASSERT(!"not implemented");
+    Q_UNIMPLEMENTED();
     return false;
 }
 
 bool Codegen::visit(UiScriptBinding *)
 {
-    Q_ASSERT(!"not implemented");
+    Q_UNIMPLEMENTED();
     return false;
 }
 
 bool Codegen::visit(UiSourceElement *)
 {
-    Q_ASSERT(!"not implemented");
+    Q_UNIMPLEMENTED();
     return false;
 }
 
-bool Codegen::throwSyntaxErrorOnEvalOrArgumentsInStrictMode(IR::Expr *expr, const SourceLocation& loc)
+bool Codegen::throwSyntaxErrorOnEvalOrArgumentsInStrictMode(const Reference &r, const SourceLocation& loc)
 {
-    if (!_variableEnvironment->isStrict)
-        return false;
-    if (IR::Name *n = expr->asName()) {
-        if (*n->id != QLatin1String("eval") && *n->id != QLatin1String("arguments"))
-            return false;
-    } else if (IR::ArgLocal *al = expr->asArgLocal()) {
-        if (!al->isArgumentsOrEval)
-            return false;
-    } else {
+    if (!_context->isStrict)
         return false;
+    bool isArgOrEval = false;
+    if (r.type == Reference::Name) {
+        QString str = jsUnitGenerator->stringForIndex(r.nameAsIndex());
+        if (str == QLatin1String("eval") || str == QLatin1String("arguments")) {
+            isArgOrEval = true;
+        }
+    } else if (r.type == Reference::ScopedLocal || r.isRegister()) {
+        isArgOrEval = r.isArgOrEval;
     }
-    throwSyntaxError(loc, QStringLiteral("Variable name may not be eval or arguments in strict mode"));
-    return true;
+    if (isArgOrEval)
+        throwSyntaxError(loc, QStringLiteral("Variable name may not be eval or arguments in strict mode"));
+    return isArgOrEval;
 }
 
 void Codegen::throwSyntaxError(const SourceLocation &loc, const QString &detail)
@@ -3049,6 +2868,116 @@ QList<QQmlJS::DiagnosticMessage> Codegen::errors() const
     return _errors;
 }
 
+QQmlRefPointer<CompiledData::CompilationUnit> Codegen::generateCompilationUnit(bool generateUnitData)
+{
+    CompiledData::CompilationUnit *compilationUnit = new CompiledData::CompilationUnit;
+    if (generateUnitData)
+        compilationUnit->data = jsUnitGenerator->generateUnit();
+
+    QQmlRefPointer<CompiledData::CompilationUnit> unit;
+    unit.adopt(compilationUnit);
+    return unit;
+}
+
+QQmlRefPointer<CompiledData::CompilationUnit> Codegen::createUnitForLoading()
+{
+    QQmlRefPointer<CompiledData::CompilationUnit> result;
+    result.adopt(new CompiledData::CompilationUnit);
+    return result;
+}
+
+class Codegen::VolatileMemoryLocationScanner: protected QQmlJS::AST::Visitor
+{
+    VolatileMemoryLocations locs;
+
+public:
+    Codegen::VolatileMemoryLocations scan(AST::Node *s)
+    {
+        s->accept(this);
+        return locs;
+    }
+
+    bool visit(ArrayMemberExpression *) Q_DECL_OVERRIDE
+    {
+        locs.setAllVolatile();
+        return false;
+    }
+
+    bool visit(FieldMemberExpression *) Q_DECL_OVERRIDE
+    {
+        locs.setAllVolatile();
+        return false;
+    }
+
+    bool visit(PostIncrementExpression *e) Q_DECL_OVERRIDE
+    {
+        collectIdentifiers(locs.specificLocations, e->base);
+        return false;
+    }
+
+    bool visit(PostDecrementExpression *e) Q_DECL_OVERRIDE
+    {
+        collectIdentifiers(locs.specificLocations, e->base);
+        return false;
+    }
+
+    bool visit(PreIncrementExpression *e) Q_DECL_OVERRIDE
+    {
+        collectIdentifiers(locs.specificLocations, e->expression);
+        return false;
+    }
+
+    bool visit(PreDecrementExpression *e) Q_DECL_OVERRIDE
+    {
+        collectIdentifiers(locs.specificLocations, e->expression);
+        return false;
+    }
+
+    bool visit(BinaryExpression *e) Q_DECL_OVERRIDE
+    {
+        switch (e->op) {
+        case QSOperator::InplaceAnd:
+        case QSOperator::InplaceSub:
+        case QSOperator::InplaceDiv:
+        case QSOperator::InplaceAdd:
+        case QSOperator::InplaceLeftShift:
+        case QSOperator::InplaceMod:
+        case QSOperator::InplaceMul:
+        case QSOperator::InplaceOr:
+        case QSOperator::InplaceRightShift:
+        case QSOperator::InplaceURightShift:
+        case QSOperator::InplaceXor:
+            collectIdentifiers(locs.specificLocations, e);
+            return false;
+
+        default:
+            return true;
+        }
+    }
+
+private:
+    void collectIdentifiers(QVector<QStringView> &ids, AST::Node *node) const {
+        class Collector: public QQmlJS::AST::Visitor {
+            QVector<QStringView> &ids;
+        public:
+            Collector(QVector<QStringView> &ids): ids(ids) {}
+            virtual bool visit(IdentifierExpression *ie) {
+                ids.append(ie->name);
+                return false;
+            }
+        };
+        Collector collector(ids);
+        node->accept(&collector);
+    }
+};
+
+Codegen::VolatileMemoryLocations Codegen::scanVolatileMemoryLocations(AST::Node *ast) const
+{
+    VolatileMemoryLocationScanner scanner;
+    return scanner.scan(ast);
+}
+
+
 #ifndef V4_BOOTSTRAP
 
 QList<QQmlError> Codegen::qmlErrors() const
@@ -3074,20 +3003,458 @@ QList<QQmlError> Codegen::qmlErrors() const
     return qmlErrors;
 }
 
-void RuntimeCodegen::throwSyntaxError(const AST::SourceLocation &loc, const QString &detail)
+#endif // V4_BOOTSTRAP
+
+bool Codegen::RValue::operator==(const RValue &other) const
 {
-    if (hasError)
-        return;
-    hasError = true;
-    engine->throwSyntaxError(detail, _module->fileName, loc.startLine, loc.startColumn);
+    switch (type) {
+    case Accumulator:
+        return other.isAccumulator();
+    case StackSlot:
+        return other.isStackSlot() && theStackSlot == other.theStackSlot;
+    case Const:
+        return other.isConst() && constant == other.constant;
+    default:
+        return false;
+    }
 }
 
-void RuntimeCodegen::throwReferenceError(const AST::SourceLocation &loc, const QString &detail)
+Codegen::RValue Codegen::RValue::storeOnStack() const
 {
-    if (hasError)
+    switch (type) {
+    case Accumulator:
+        return RValue::fromStackSlot(codegen, Reference::fromAccumulator(codegen).storeOnStack().stackSlot());
+    case StackSlot:
+        return *this;
+    case Const:
+        return RValue::fromStackSlot(codegen, Reference::storeConstOnStack(codegen, constant).stackSlot());
+    default:
+        Q_UNREACHABLE();
+    }
+}
+
+Codegen::Reference::Reference(const Codegen::Reference &other)
+{
+    *this = other;
+}
+
+Codegen::Reference &Codegen::Reference::operator =(const Reference &other)
+{
+    type = other.type;
+
+    switch (type) {
+    case Invalid:
+    case Accumulator:
+        break;
+    case StackSlot:
+        theStackSlot = other.theStackSlot;
+        break;
+    case ScopedLocal:
+        index = other.index;
+        scope = other.scope;
+        break;
+    case Name:
+        name = other.name;
+        break;
+    case Member:
+        propertyBase = other.propertyBase;
+        propertyNameIndex = other.propertyNameIndex;
+        break;
+    case Subscript:
+        elementBase = other.elementBase;
+        elementSubscript = other.elementSubscript;
+        break;
+    case Const:
+        constant = other.constant;
+        break;
+    case QmlScopeObject:
+    case QmlContextObject:
+        qmlBase = other.qmlBase;
+        qmlCoreIndex = other.qmlCoreIndex;
+        qmlNotifyIndex = other.qmlNotifyIndex;
+        captureRequired = other.captureRequired;
+        break;
+    }
+
+    // keep loaded reference
+    isArgOrEval = other.isArgOrEval;
+    codegen = other.codegen;
+    isReadonly = other.isReadonly;
+    stackSlotIsLocalOrArgument = other.stackSlotIsLocalOrArgument;
+    isVolatile = other.isVolatile;
+    global = other.global;
+    return *this;
+}
+
+bool Codegen::Reference::operator==(const Codegen::Reference &other) const
+{
+    if (type != other.type)
+        return false;
+    switch (type) {
+    case Invalid:
+    case Accumulator:
+        break;
+    case StackSlot:
+        return theStackSlot == other.theStackSlot;
+    case ScopedLocal:
+        return index == other.index && scope == other.scope;
+    case Name:
+        return nameAsIndex() == other.nameAsIndex();
+    case Member:
+        return propertyBase == other.propertyBase && propertyNameIndex == other.propertyNameIndex;
+    case Subscript:
+        return elementBase == other.elementBase && elementSubscript == other.elementSubscript;
+    case Const:
+        return constant == other.constant;
+    case QmlScopeObject:
+    case QmlContextObject:
+        return qmlCoreIndex == other.qmlCoreIndex && qmlNotifyIndex == other.qmlNotifyIndex
+                && captureRequired == other.captureRequired;
+    }
+    return true;
+}
+
+Codegen::RValue Codegen::Reference::asRValue() const
+{
+    switch (type) {
+    case Invalid:
+        Q_UNREACHABLE();
+    case Accumulator:
+        return RValue::fromAccumulator(codegen);
+    case StackSlot:
+        return RValue::fromStackSlot(codegen, stackSlot());
+    case Const:
+        return RValue::fromConst(codegen, constant);
+    default:
+        loadInAccumulator();
+        return RValue::fromAccumulator(codegen);
+    }
+}
+
+Codegen::Reference Codegen::Reference::asLValue() const
+{
+    switch (type) {
+    case Invalid:
+    case Accumulator:
+        Q_UNREACHABLE();
+    case Member:
+        if (!propertyBase.isStackSlot()) {
+            Reference r = *this;
+            r.propertyBase = propertyBase.storeOnStack();
+            return r;
+        }
+        return *this;
+    case Subscript:
+        if (!elementSubscript.isStackSlot()) {
+            Reference r = *this;
+            r.elementSubscript = elementSubscript.storeOnStack();
+            return r;
+        }
+        return *this;
+    default:
+        return *this;
+    }
+}
+
+Codegen::Reference Codegen::Reference::storeConsumeAccumulator() const
+{
+    storeAccumulator(); // it doesn't matter what happens here, just do it.
+    return Reference();
+}
+
+Codegen::Reference Codegen::Reference::storeOnStack() const
+{ return doStoreOnStack(-1); }
+
+void Codegen::Reference::storeOnStack(int slotIndex) const
+{ doStoreOnStack(slotIndex); }
+
+Codegen::Reference Codegen::Reference::doStoreOnStack(int slotIndex) const
+{
+    if (isStackSlot() && slotIndex == -1 && !(stackSlotIsLocalOrArgument && isVolatile))
+        return *this;
+
+    if (isStackSlot()) { // temp-to-temp move
+        Reference dest = Reference::fromStackSlot(codegen, slotIndex);
+        Instruction::MoveReg move;
+        move.srcReg = stackSlot();
+        move.destReg = dest.stackSlot();
+        codegen->bytecodeGenerator->addInstruction(move);
+        return dest;
+    }
+
+    Reference slot = Reference::fromStackSlot(codegen, slotIndex);
+    if (isConst()) {
+        Instruction::MoveConst move;
+        move.constIndex = codegen->registerConstant(constant);
+        move.destTemp = slot.stackSlot();
+        codegen->bytecodeGenerator->addInstruction(move);
+    } else {
+        loadInAccumulator();
+        slot.storeConsumeAccumulator();
+    }
+    return slot;
+}
+
+Codegen::Reference Codegen::Reference::storeRetainAccumulator() const
+{
+    if (storeWipesAccumulator()) {
+        // a store will
+        auto tmp = Reference::fromStackSlot(codegen);
+        tmp.storeAccumulator(); // this is safe, and won't destory the accumulator
+        storeAccumulator();
+        return tmp;
+    } else {
+        // ok, this is safe, just do the store.
+        storeAccumulator();
+        return *this;
+    }
+}
+
+bool Codegen::Reference::storeWipesAccumulator() const
+{
+    switch (type) {
+    default:
+    case Invalid:
+    case Const:
+    case Accumulator:
+        Q_UNREACHABLE();
+        return false;
+    case StackSlot:
+    case ScopedLocal:
+        return false;
+    case Name:
+    case Member:
+    case Subscript:
+    case QmlScopeObject:
+    case QmlContextObject:
+        return true;
+    }
+}
+
+void Codegen::Reference::storeAccumulator() const
+{
+    switch (type) {
+    case StackSlot: {
+        Instruction::StoreReg store;
+        store.reg = theStackSlot;
+        codegen->bytecodeGenerator->addInstruction(store);
         return;
-    hasError = true;
-    engine->throwReferenceError(detail, _module->fileName, loc.startLine, loc.startColumn);
+    }
+    case ScopedLocal: {
+        if (scope == 0) {
+            Instruction::StoreLocal store;
+            store.index = index;
+            codegen->bytecodeGenerator->addInstruction(store);
+        } else {
+            Instruction::StoreScopedLocal store;
+            store.index = index;
+            store.scope = scope;
+            codegen->bytecodeGenerator->addInstruction(store);
+        }
+        return;
+    }
+    case Name: {
+        Context *c = codegen->currentContext();
+        if (c->isStrict) {
+            Instruction::StoreNameStrict store;
+            store.name = nameAsIndex();
+            codegen->bytecodeGenerator->addInstruction(store);
+        } else {
+            Instruction::StoreNameSloppy store;
+            store.name = nameAsIndex();
+            codegen->bytecodeGenerator->addInstruction(store);
+        }
+    } return;
+    case Member:
+        if (codegen->useFastLookups) {
+            Instruction::SetLookup store;
+            store.base = propertyBase.stackSlot();
+            store.index = codegen->registerSetterLookup(propertyNameIndex);
+            codegen->bytecodeGenerator->addInstruction(store);
+        } else {
+            Instruction::StoreProperty store;
+            store.base = propertyBase.stackSlot();
+            store.name = propertyNameIndex;
+            codegen->bytecodeGenerator->addInstruction(store);
+        }
+        return;
+    case Subscript: {
+        Instruction::StoreElement store;
+        store.base = elementBase;
+        store.index = elementSubscript.stackSlot();
+        codegen->bytecodeGenerator->addInstruction(store);
+    } return;
+    case QmlScopeObject: {
+        Instruction::StoreScopeObjectProperty store;
+        store.base = qmlBase;
+        store.propertyIndex = qmlCoreIndex;
+        codegen->bytecodeGenerator->addInstruction(store);
+    } return;
+    case QmlContextObject: {
+        Instruction::StoreContextObjectProperty store;
+        store.base = qmlBase;
+        store.propertyIndex = qmlCoreIndex;
+        codegen->bytecodeGenerator->addInstruction(store);
+    } return;
+    case Invalid:
+    case Accumulator:
+    case Const:
+        break;
+    }
+
+    Q_ASSERT(false);
+    Q_UNREACHABLE();
 }
 
-#endif // V4_BOOTSTRAP
+void Codegen::Reference::loadInAccumulator() const
+{
+    switch (type) {
+    case Accumulator:
+        return;
+    case Const: {
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_GCC("-Wmaybe-uninitialized") // the loads below are empty structs.
+        if (constant == Encode::null()) {
+            Instruction::LoadNull load;
+            codegen->bytecodeGenerator->addInstruction(load);
+        } else if (constant == Encode(true)) {
+            Instruction::LoadTrue load;
+            codegen->bytecodeGenerator->addInstruction(load);
+        } else if (constant == Encode(false)) {
+            Instruction::LoadFalse load;
+            codegen->bytecodeGenerator->addInstruction(load);
+        } else if (constant == Encode::undefined()) {
+            Instruction::LoadUndefined load;
+            codegen->bytecodeGenerator->addInstruction(load);
+        } else {
+            Value p = Primitive::fromReturnedValue(constant);
+            if (p.isNumber()) {
+                double d = p.asDouble();
+                int i = static_cast<int>(d);
+                if (d == i && (d != 0 || !std::signbit(d))) {
+                    if (!i) {
+                        Instruction::LoadZero load;
+                        codegen->bytecodeGenerator->addInstruction(load);
+                        return;
+                    }
+                    Instruction::LoadInt load;
+                    load.value = Primitive::fromReturnedValue(constant).toInt32();
+                    codegen->bytecodeGenerator->addInstruction(load);
+                    return;
+                }
+            }
+            Instruction::LoadConst load;
+            load.index = codegen->registerConstant(constant);
+            codegen->bytecodeGenerator->addInstruction(load);
+        }
+QT_WARNING_POP
+    } return;
+    case StackSlot: {
+        Instruction::LoadReg load;
+        load.reg = stackSlot();
+        codegen->bytecodeGenerator->addInstruction(load);
+    } return;
+    case ScopedLocal: {
+        if (!scope) {
+            Instruction::LoadLocal load;
+            load.index = index;
+            codegen->bytecodeGenerator->addInstruction(load);
+        } else {
+            Instruction::LoadScopedLocal load;
+            load.index = index;
+            load.scope = scope;
+            codegen->bytecodeGenerator->addInstruction(load);
+        }
+        return;
+    }
+    case Name:
+        if (global) {
+            // these value properties of the global object are immutable, we we can directly convert them
+            // to their numeric value here
+            if (name == QStringLiteral("undefined")) {
+                Reference::fromConst(codegen, Encode::undefined()).loadInAccumulator();
+                return;
+            } else if (name == QStringLiteral("Infinity")) {
+                Reference::fromConst(codegen, Encode(qInf())).loadInAccumulator();
+                return;
+            } else if (name == QStringLiteral("Nan")) {
+                Reference::fromConst(codegen, Encode(qQNaN())).loadInAccumulator();
+                return;
+            }
+        }
+        if (codegen->useFastLookups && global) {
+            Instruction::LoadGlobalLookup load;
+            load.index = codegen->registerGlobalGetterLookup(nameAsIndex());
+            codegen->bytecodeGenerator->addInstruction(load);
+        } else {
+            Instruction::LoadName load;
+            load.name = nameAsIndex();
+            codegen->bytecodeGenerator->addInstruction(load);
+        }
+        return;
+    case Member:
+        if (codegen->useFastLookups) {
+            if (propertyBase.isAccumulator()) {
+                Instruction::GetLookupA load;
+                load.index = codegen->registerGetterLookup(propertyNameIndex);
+                codegen->bytecodeGenerator->addInstruction(load);
+            } else {
+                Instruction::GetLookup load;
+                load.base = propertyBase.storeOnStack().stackSlot();
+                load.index = codegen->registerGetterLookup(propertyNameIndex);
+                codegen->bytecodeGenerator->addInstruction(load);
+            }
+        } else {
+            if (propertyBase.isAccumulator()) {
+                Instruction::LoadPropertyA load;
+                load.name = propertyNameIndex;
+                codegen->bytecodeGenerator->addInstruction(load);
+            } else {
+                Instruction::LoadProperty load;
+                load.base = propertyBase.storeOnStack().stackSlot();
+                load.name = propertyNameIndex;
+                codegen->bytecodeGenerator->addInstruction(load);
+            }
+        }
+        return;
+    case Subscript: {
+        if (elementSubscript.isAccumulator()) {
+            Instruction::LoadElementA load;
+            load.base = elementBase;
+            codegen->bytecodeGenerator->addInstruction(load);
+        } else if (elementSubscript.isConst()) {
+            Reference::fromConst(codegen, elementSubscript.constantValue()).loadInAccumulator();
+            Instruction::LoadElementA load;
+            load.base = elementBase;
+            codegen->bytecodeGenerator->addInstruction(load);
+        } else {
+            Instruction::LoadElement load;
+            load.base = elementBase;
+            load.index = elementSubscript.storeOnStack().stackSlot();
+            codegen->bytecodeGenerator->addInstruction(load);
+        }
+    } return;
+    case QmlScopeObject: {
+        Instruction::LoadScopeObjectProperty load;
+        load.base = qmlBase;
+        load.propertyIndex = qmlCoreIndex;
+        load.captureRequired = captureRequired;
+        codegen->bytecodeGenerator->addInstruction(load);
+        if (!captureRequired)
+            codegen->_context->scopeObjectPropertyDependencies.insert(qmlCoreIndex, qmlNotifyIndex);
+    } return;
+    case QmlContextObject: {
+        Instruction::LoadContextObjectProperty load;
+        load.base = qmlBase;
+        load.propertyIndex = qmlCoreIndex;
+        load.captureRequired = captureRequired;
+        codegen->bytecodeGenerator->addInstruction(load);
+        if (!captureRequired)
+            codegen->_context->contextObjectPropertyDependencies.insert(qmlCoreIndex, qmlNotifyIndex);
+    } return;
+    case Invalid:
+        break;
+    }
+    Q_ASSERT(false);
+    Q_UNREACHABLE();
+}
diff --git a/src/qml/compiler/qv4codegen_p.h b/src/qml/compiler/qv4codegen_p.h
index 31e9cc0f46..dba9388292 100644
--- a/src/qml/compiler/qv4codegen_p.h
+++ b/src/qml/compiler/qv4codegen_p.h
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtQml module of the Qt Toolkit.
@@ -51,311 +51,465 @@
 //
 
 #include "private/qv4global_p.h"
-#include "qv4jsir_p.h"
 #include <private/qqmljsastvisitor_p.h>
 #include <private/qqmljsast_p.h>
 #include <private/qqmljsengine_p.h>
+#include <private/qv4instr_moth_p.h>
+#include <private/qv4compiler_p.h>
+#include <private/qv4compilercontext_p.h>
+#include <private/qqmlrefcount_p.h>
 #include <QtCore/QStringList>
+#include <QtCore/QDateTime>
 #include <QStack>
 #ifndef V4_BOOTSTRAP
 #include <qqmlerror.h>
 #endif
 #include <private/qv4util_p.h>
+#include <private/qv4bytecodegenerator_p.h>
 
 QT_BEGIN_NAMESPACE
 
-namespace QQmlJS {
-namespace AST {
-class UiParameterList;
+using namespace QQmlJS;
+
+namespace QV4 {
+
+namespace Moth {
+struct Instruction;
 }
 
+namespace CompiledData {
+struct CompilationUnit;
+}
+
+namespace Compiler {
+
+struct ControlFlow;
+struct ControlFlowCatch;
+struct ControlFlowFinally;
 
-class Q_QML_PRIVATE_EXPORT Codegen: protected AST::Visitor
+class Q_QML_PRIVATE_EXPORT Codegen: protected QQmlJS::AST::Visitor
 {
+protected:
+    using BytecodeGenerator = QV4::Moth::BytecodeGenerator;
+    using Instruction = QV4::Moth::Instruction;
 public:
-    Codegen(bool strict);
-
-    enum CompilationMode {
-        GlobalCode,
-        EvalCode,
-        FunctionCode,
-        QmlBinding // This is almost the same as EvalCode, except:
-                   //  * function declarations are moved to the return address when encountered
-                   //  * return statements are allowed everywhere (like in FunctionCode)
-                   //  * variable declarations are treated as true locals (like in FunctionCode)
-    };
+    Codegen(QV4::Compiler::JSUnitGenerator *jsUnitGenerator, bool strict);
+
 
     void generateFromProgram(const QString &fileName,
                              const QString &sourceCode,
                              AST::Program *ast,
-                             QV4::IR::Module *module,
-                             CompilationMode mode = GlobalCode,
-                             const QStringList &inheritedLocals = QStringList());
-    void generateFromFunctionExpression(const QString &fileName,
-                             const QString &sourceCode,
-                             AST::FunctionExpression *ast,
-                             QV4::IR::Module *module);
+                             Module *module,
+                             CompilationMode mode = GlobalCode);
 
-protected:
-    enum Format { ex, cx, nx };
-    struct Result {
-        QV4::IR::Expr *code;
-        QV4::IR::BasicBlock *iftrue;
-        QV4::IR::BasicBlock *iffalse;
-        Format format;
-        Format requested;
+public:
+    class VolatileMemoryLocationScanner;
+    class VolatileMemoryLocations {
+        friend VolatileMemoryLocationScanner;
+        bool allVolatile = false;
+        QVector<QStringView> specificLocations;
+    public:
+        bool isVolatile(const QStringView &name) {
+            if (allVolatile)
+                return true;
+            return specificLocations.contains(name);
+        }
 
-        explicit Result(Format requested = ex)
-            : code(0)
-            , iftrue(0)
-            , iffalse(0)
-            , format(ex)
-            , requested(requested) {}
-
-        explicit Result(QV4::IR::BasicBlock *iftrue, QV4::IR::BasicBlock *iffalse)
-            : code(0)
-            , iftrue(iftrue)
-            , iffalse(iffalse)
-            , format(ex)
-            , requested(cx) {}
-
-        inline QV4::IR::Expr *operator*() const { Q_ASSERT(format == ex); return code; }
-        inline QV4::IR::Expr *operator->() const { Q_ASSERT(format == ex); return code; }
+        void add(const QStringRef &name) { if (!allVolatile) specificLocations.append(name); }
+        void setAllVolatile() { allVolatile = true; }
+    };
+    class RValue {
+        Codegen *codegen;
+        enum Type {
+            Invalid,
+            Accumulator,
+            StackSlot,
+            Const
+        } type;
+        union {
+            Moth::StackSlot theStackSlot;
+            QV4::ReturnedValue constant;
+        };
 
-        bool accept(Format f)
-        {
-            if (requested == f) {
-                format = f;
+    public:
+        static RValue fromStackSlot(Codegen *codegen, Moth::StackSlot stackSlot) {
+            RValue r;
+            r.codegen = codegen;
+            r.type = StackSlot;
+            r.theStackSlot = stackSlot;
+            return r;
+        }
+        static RValue fromAccumulator(Codegen *codegen) {
+            RValue r;
+            r.codegen = codegen;
+            r.type = Accumulator;
+            return r;
+        }
+        static RValue fromConst(Codegen *codegen, QV4::ReturnedValue value) {
+            RValue r;
+            r.codegen = codegen;
+            r.type = Const;
+            r.constant = value;
+            return r;
+        }
+
+        bool operator==(const RValue &other) const;
+
+        bool isValid() const { return type != Invalid; }
+        bool isAccumulator() const { return type == Accumulator; }
+        bool isStackSlot() const { return type == StackSlot; }
+        bool isConst() const { return type == Const; }
+
+        Moth::StackSlot stackSlot() const {
+            Q_ASSERT(isStackSlot());
+            return theStackSlot;
+        }
+
+        QV4::ReturnedValue constantValue() const {
+            Q_ASSERT(isConst());
+            return constant;
+        }
+
+        Q_REQUIRED_RESULT RValue storeOnStack() const;
+    };
+    struct Reference {
+        enum Type {
+            Invalid,
+            Accumulator,
+            StackSlot,
+            ScopedLocal,
+            Name,
+            Member,
+            Subscript,
+            QmlScopeObject,
+            QmlContextObject,
+            LastLValue = QmlContextObject,
+            Const
+        } type = Invalid;
+
+        bool isLValue() const { return !isReadonly; }
+
+        Reference(Codegen *cg, Type type = Invalid) : type(type), codegen(cg) {}
+        Reference()
+            : type(Invalid)
+            , codegen(nullptr)
+        {}
+        Reference(const Reference &other);
+
+        Reference &operator =(const Reference &other);
+
+        bool operator==(const Reference &other) const;
+
+        bool isValid() const { return type != Invalid; }
+        bool loadTriggersSideEffect() const {
+            switch (type) {
+            case Name:
+            case Member:
+            case Subscript:
                 return true;
+            default:
+                return false;
             }
-            return false;
         }
-    };
+        bool isConst() const { return type == Const; }
+        bool isAccumulator() const { return type == Accumulator; }
+        bool isStackSlot() const { return type == StackSlot; }
+        bool isRegister() const {
+            return isStackSlot();
+        }
 
-    struct Environment {
-        Environment *parent;
+        static Reference fromAccumulator(Codegen *cg) {
+            return Reference(cg, Accumulator);
+        }
+        static Reference fromStackSlot(Codegen *cg, int tempIndex = -1, bool isLocal = false) {
+            Reference r(cg, StackSlot);
+            if (tempIndex == -1)
+                tempIndex = cg->bytecodeGenerator->newRegister();
+            r.theStackSlot = Moth::StackSlot::createRegister(tempIndex);
+            r.stackSlotIsLocalOrArgument = isLocal;
+            return r;
+        }
+        static Reference fromArgument(Codegen *cg, int index, bool isVolatile) {
+            Reference r(cg, StackSlot);
+            r.theStackSlot = Moth::StackSlot::createRegister(index + sizeof(CallData)/sizeof(Value) - 1);
+            r.stackSlotIsLocalOrArgument = true;
+            r.isVolatile = isVolatile;
+            return r;
+        }
+        static Reference fromScopedLocal(Codegen *cg, int index, int scope) {
+            Reference r(cg, ScopedLocal);
+            r.index = index;
+            r.scope = scope;
+            return r;
+        }
+        static Reference fromName(Codegen *cg, const QString &name) {
+            Reference r(cg, Name);
+            r.name = name;
+            return r;
+        }
+        static Reference fromMember(const Reference &baseRef, const QString &name) {
+            Reference r(baseRef.codegen, Member);
+            r.propertyBase = baseRef.asRValue();
+            r.propertyNameIndex = r.codegen->registerString(name);
+            return r;
+        }
+        static Reference fromSubscript(const Reference &baseRef, const Reference &subscript) {
+            Q_ASSERT(baseRef.isStackSlot());
+            Reference r(baseRef.codegen, Subscript);
+            r.elementBase = baseRef.stackSlot();
+            r.elementSubscript = subscript.asRValue();
+            return r;
+        }
+        static Reference fromConst(Codegen *cg, QV4::ReturnedValue constant) {
+            Reference r(cg, Const);
+            r.constant = constant;
+            r.isReadonly = true;
+            return r;
+        }
+        static Reference fromQmlScopeObject(const Reference &base, qint16 coreIndex, qint16 notifyIndex, bool captureRequired) {
+            Reference r(base.codegen, QmlScopeObject);
+            r.qmlBase = base.storeOnStack().stackSlot();
+            r.qmlCoreIndex = coreIndex;
+            r.qmlNotifyIndex = notifyIndex;
+            r.captureRequired = captureRequired;
+            return r;
+        }
+        static Reference fromQmlContextObject(const Reference &base, qint16 coreIndex, qint16 notifyIndex, bool captureRequired) {
+            Reference r(base.codegen, QmlContextObject);
+            r.qmlBase = base.storeOnStack().stackSlot();
+            r.qmlCoreIndex = coreIndex;
+            r.qmlNotifyIndex = notifyIndex;
+            r.captureRequired = captureRequired;
+            return r;
+        }
+        static Reference fromThis(Codegen *cg) {
+            Reference r = fromStackSlot(cg, CallData::This);
+            r.isReadonly = true;
+            return r;
+        }
 
-        enum MemberType {
-            UndefinedMember,
-            VariableDefinition,
-            VariableDeclaration,
-            FunctionDefinition
-        };
+        RValue asRValue() const;
+        Reference asLValue() const;
 
-        struct Member {
-            MemberType type;
-            int index;
-            AST::FunctionExpression *function;
-            AST::VariableDeclaration::VariableScope scope;
+        Q_REQUIRED_RESULT static Reference storeConstOnStack(Codegen *cg, QV4::ReturnedValue constant)
+        { return Reference::fromConst(cg, constant).storeOnStack(); }
 
-            bool isLexicallyScoped() const { return this->scope != AST::VariableDeclaration::FunctionScope; }
-        };
-        typedef QMap<QString, Member> MemberMap;
-
-        MemberMap members;
-        AST::FormalParameterList *formals;
-        int maxNumberOfArguments;
-        bool hasDirectEval;
-        bool hasNestedFunctions;
-        bool isStrict;
-        bool isNamedFunctionExpression;
-        bool usesThis;
-        enum UsesArgumentsObject {
-            ArgumentsObjectUnknown,
-            ArgumentsObjectNotUsed,
-            ArgumentsObjectUsed
+        static void storeConstOnStack(Codegen *cg, QV4::ReturnedValue constant, int stackSlot)
+        { Reference::fromConst(cg, constant).storeOnStack(stackSlot); }
+
+        Q_REQUIRED_RESULT Reference storeOnStack() const;
+        void storeOnStack(int tempIndex) const;
+        Q_REQUIRED_RESULT Reference storeRetainAccumulator() const;
+        Reference storeConsumeAccumulator() const;
+
+        bool storeWipesAccumulator() const;
+        void loadInAccumulator() const;
+
+        int nameAsIndex() const {
+            Q_ASSERT(type == Name);
+            return codegen->registerString(name);
+        }
+
+        Moth::StackSlot stackSlot() const {
+            if (Q_UNLIKELY(!isStackSlot()))
+                Q_UNREACHABLE();
+            return theStackSlot;
+        }
+
+        union {
+            Moth::StackSlot theStackSlot;
+            QV4::ReturnedValue constant;
+            struct { // Scoped arguments/Local
+                int index;
+                int scope;
+            };
+            struct {
+                RValue propertyBase;
+                int propertyNameIndex;
+            };
+            struct {
+                Moth::StackSlot elementBase;
+                RValue elementSubscript;
+            };
+            struct { // QML scope/context object case
+                Moth::StackSlot qmlBase;
+                qint16 qmlCoreIndex;
+                qint16 qmlNotifyIndex;
+                bool captureRequired;
+            };
         };
+        QString name;
+        mutable bool isArgOrEval = false;
+        bool isReadonly = false;
+        bool stackSlotIsLocalOrArgument = false;
+        bool isVolatile = false;
+        bool global = false;
+        Codegen *codegen;
+
+    private:
+        void storeAccumulator() const;
+        Reference doStoreOnStack(int tempIndex) const;
+    };
 
-        UsesArgumentsObject usesArgumentsObject;
-
-        CompilationMode compilationMode;
-
-        Environment(Environment *parent, CompilationMode mode)
-            : parent(parent)
-            , formals(0)
-            , maxNumberOfArguments(0)
-            , hasDirectEval(false)
-            , hasNestedFunctions(false)
-            , isStrict(false)
-            , isNamedFunctionExpression(false)
-            , usesThis(false)
-            , usesArgumentsObject(ArgumentsObjectUnknown)
-            , compilationMode(mode)
-        {
-            if (parent && parent->isStrict)
-                isStrict = true;
+    struct RegisterScope {
+        RegisterScope(Codegen *cg)
+            : generator(cg->bytecodeGenerator),
+              regCountForScope(generator->currentReg) {}
+        ~RegisterScope() {
+            generator->currentReg = regCountForScope;
         }
+        BytecodeGenerator *generator;
+        int regCountForScope;
+    };
+
+    struct ObjectPropertyValue {
+        ObjectPropertyValue()
+            : getter(-1)
+            , setter(-1)
+            , keyAsIndex(UINT_MAX)
+        {}
+
+        Reference rvalue;
+        int getter; // index in _module->functions or -1 if not set
+        int setter;
+        uint keyAsIndex;
+
+        bool hasGetter() const { return getter >= 0; }
+        bool hasSetter() const { return setter >= 0; }
+    };
+protected:
 
-        int findMember(const QString &name) const
+    enum Format { ex, cx, nx };
+    class Result {
+        Reference _result;
+
+        const BytecodeGenerator::Label *_iftrue;
+        const BytecodeGenerator::Label *_iffalse;
+        Format _format;
+        Format _requested;
+        bool _trueBlockFollowsCondition = false;
+
+    public:
+        explicit Result(const Reference &lrvalue)
+            : _result(lrvalue)
+            , _iftrue(nullptr)
+            , _iffalse(nullptr)
+            , _format(ex)
+            , _requested(ex)
         {
-            MemberMap::const_iterator it = members.find(name);
-            if (it == members.end())
-                return -1;
-            Q_ASSERT((*it).index != -1 || !parent);
-            return (*it).index;
         }
 
-        bool memberInfo(const QString &name, const Member **m) const
+        explicit Result(Format requested = ex)
+            : _iftrue(0)
+            , _iffalse(0)
+            , _format(ex)
+            , _requested(requested) {}
+
+        explicit Result(const BytecodeGenerator::Label *iftrue,
+                        const BytecodeGenerator::Label *iffalse,
+                        bool trueBlockFollowsCondition)
+            : _iftrue(iftrue)
+            , _iffalse(iffalse)
+            , _format(ex)
+            , _requested(cx)
+            , _trueBlockFollowsCondition(trueBlockFollowsCondition)
         {
-            Q_ASSERT(m);
-            MemberMap::const_iterator it = members.find(name);
-            if (it == members.end()) {
-                *m = 0;
-                return false;
-            }
-            *m = &(*it);
-            return true;
+            Q_ASSERT(iftrue);
+            Q_ASSERT(iffalse);
         }
 
-        bool lookupMember(const QString &name, Environment **scope, int *index, int *distance)
-        {
-            Environment *it = this;
-            *distance = 0;
-            for (; it; it = it->parent, ++(*distance)) {
-                int idx = it->findMember(name);
-                if (idx != -1) {
-                    *scope = it;
-                    *index = idx;
-                    return true;
-                }
-            }
-            return false;
+        const BytecodeGenerator::Label *iftrue() const {
+            Q_ASSERT(_requested == cx);
+            return _iftrue;
+        }
+
+        const BytecodeGenerator::Label *iffalse() const {
+            Q_ASSERT(_requested == cx);
+            return _iffalse;
+        }
+
+        Format format() const {
+            return _format;
         }
 
-        void enter(const QString &name, MemberType type, AST::VariableDeclaration::VariableScope scope, AST::FunctionExpression *function = 0)
+        bool accept(Format f)
         {
-            if (! name.isEmpty()) {
-                if (type != FunctionDefinition) {
-                    for (AST::FormalParameterList *it = formals; it; it = it->next)
-                        if (it->name == name)
-                            return;
-                }
-                MemberMap::iterator it = members.find(name);
-                if (it == members.end()) {
-                    Member m;
-                    m.index = -1;
-                    m.type = type;
-                    m.function = function;
-                    m.scope = scope;
-                    members.insert(name, m);
-                } else {
-                    Q_ASSERT(scope == (*it).scope);
-                    if ((*it).type <= type) {
-                        (*it).type = type;
-                        (*it).function = function;
-                    }
-                }
+            if (_requested == f) {
+                _format = f;
+                return true;
             }
+            return false;
         }
-    };
 
-    struct TempScope {
-        TempScope(QV4::IR::Function *f)
-            : function(f),
-              tempCountForScope(f->currentTemp) {}
-        ~TempScope() {
-            function->currentTemp = tempCountForScope;
+        bool trueBlockFollowsCondition() const {
+            return _trueBlockFollowsCondition;
         }
-        QV4::IR::Function *function;
-        int tempCountForScope;
-    };
 
-    Environment *newEnvironment(AST::Node *node, Environment *parent, CompilationMode compilationMode)
-    {
-        Environment *env = new Environment(parent, compilationMode);
-        _envMap.insert(node, env);
-        return env;
-    }
+        const Reference &result() const {
+            return _result;
+        }
 
-    struct UiMember {
+        void setResult(const Reference &result) {
+            _result = result;
+        }
     };
 
-    struct ScopeAndFinally {
-        enum ScopeType {
-            WithScope,
-            TryScope,
-            CatchScope
-        };
+    void enterContext(AST::Node *node);
+    int leaveContext();
 
-        ScopeAndFinally *parent;
-        AST::Finally *finally;
-        ScopeType type;
+    void leaveLoop();
 
-        ScopeAndFinally(ScopeAndFinally *parent, ScopeType t = WithScope) : parent(parent), finally(0), type(t) {}
-        ScopeAndFinally(ScopeAndFinally *parent, AST::Finally *finally)
-        : parent(parent), finally(finally), type(TryScope)
-        {}
+    enum UnaryOperation {
+        UPlus,
+        UMinus,
+        PreIncrement,
+        PreDecrement,
+        PostIncrement,
+        PostDecrement,
+        Not,
+        Compl
     };
 
-    struct Loop {
-        AST::LabelledStatement *labelledStatement;
-        AST::Statement *node;
-        QV4::IR::BasicBlock *breakBlock;
-        QV4::IR::BasicBlock *continueBlock;
-        Loop *parent;
-        ScopeAndFinally *scopeAndFinally;
-
-        Loop(AST::Statement *node, QV4::IR::BasicBlock *breakBlock, QV4::IR::BasicBlock *continueBlock, Loop *parent)
-            : labelledStatement(0), node(node), breakBlock(breakBlock), continueBlock(continueBlock), parent(parent) {}
-    };
+    Reference unop(UnaryOperation op, const Reference &expr);
 
-    void enterEnvironment(AST::Node *node);
-    void leaveEnvironment();
+    void addCJump();
 
-    void enterLoop(AST::Statement *node, QV4::IR::BasicBlock *breakBlock, QV4::IR::BasicBlock *continueBlock);
-    void leaveLoop();
-    QV4::IR::BasicBlock *exceptionHandler() const
-    {
-        if (_exceptionHandlers.isEmpty())
-            return 0;
-        return _exceptionHandlers.top();
-    }
-    void pushExceptionHandler(QV4::IR::BasicBlock *handler)
-    {
-        handler->setExceptionHandler(true);
-        _exceptionHandlers.push(handler);
+    int registerString(const QString &name) {
+        return jsUnitGenerator->registerString(name);
     }
-    void popExceptionHandler()
-    {
-        Q_ASSERT(!_exceptionHandlers.isEmpty());
-        _exceptionHandlers.pop();
-    }
-
-    QV4::IR::Expr *member(QV4::IR::Expr *base, const QString *name);
-    QV4::IR::Expr *argument(QV4::IR::Expr *expr);
-    QV4::IR::Expr *reference(QV4::IR::Expr *expr);
-    QV4::IR::Expr *unop(QV4::IR::AluOp op, QV4::IR::Expr *expr, const AST::SourceLocation &loc = AST::SourceLocation());
-    QV4::IR::Expr *binop(QV4::IR::AluOp op, QV4::IR::Expr *left, QV4::IR::Expr *right, const AST::SourceLocation &loc = AST::SourceLocation());
-    QV4::IR::Expr *call(QV4::IR::Expr *base, QV4::IR::ExprList *args);
-    QV4::IR::Stmt *move(QV4::IR::Expr *target, QV4::IR::Expr *source, QV4::IR::AluOp op = QV4::IR::OpInvalid);
-    QV4::IR::Stmt *cjump(QV4::IR::Expr *cond, QV4::IR::BasicBlock *iftrue, QV4::IR::BasicBlock *iffalse);
+    int registerConstant(QV4::ReturnedValue v) { return jsUnitGenerator->registerConstant(v); }
+    int registerGetterLookup(int nameIndex) { return jsUnitGenerator->registerGetterLookup(nameIndex); }
+    int registerSetterLookup(int nameIndex) { return jsUnitGenerator->registerSetterLookup(nameIndex); }
+    int registerGlobalGetterLookup(int nameIndex) { return jsUnitGenerator->registerGlobalGetterLookup(nameIndex); }
 
     // Returns index in _module->functions
-    int defineFunction(const QString &name, AST::Node *ast,
-                       AST::FormalParameterList *formals,
-                       AST::SourceElements *body,
-                       const QStringList &inheritedLocals = QStringList());
-
-    void unwindException(ScopeAndFinally *outest);
+    virtual int defineFunction(const QString &name, AST::Node *ast,
+                               AST::FormalParameterList *formals,
+                               AST::SourceElements *body);
 
     void statement(AST::Statement *ast);
     void statement(AST::ExpressionNode *ast);
-    void condition(AST::ExpressionNode *ast, QV4::IR::BasicBlock *iftrue, QV4::IR::BasicBlock *iffalse);
-    Result expression(AST::ExpressionNode *ast);
+    void condition(AST::ExpressionNode *ast, const BytecodeGenerator::Label *iftrue,
+                   const BytecodeGenerator::Label *iffalse,
+                   bool trueBlockFollowsCondition);
+    Reference expression(AST::ExpressionNode *ast);
     Result sourceElement(AST::SourceElement *ast);
-    UiMember uiObjectMember(AST::UiObjectMember *ast);
 
     void accept(AST::Node *node);
 
     void functionBody(AST::FunctionBody *ast);
     void program(AST::Program *ast);
     void sourceElements(AST::SourceElements *ast);
+    void statementList(AST::StatementList *ast);
     void variableDeclaration(AST::VariableDeclaration *ast);
     void variableDeclarationList(AST::VariableDeclarationList *ast);
 
-    QV4::IR::Expr *identifier(const QString &name, int line = 0, int col = 0);
+    Reference referenceForName(const QString &name, bool lhs);
+
+    void loadClosure(int index);
+
     // Hook provided to implement QML lookup semantics
-    virtual QV4::IR::Expr *fallbackNameLookup(const QString &name, int line, int col);
+    virtual Reference fallbackNameLookup(const QString &name);
     virtual void beginFunctionBodyHook() {}
 
     // nodes
@@ -457,7 +611,7 @@ protected:
     bool visit(AST::UiScriptBinding *ast) override;
     bool visit(AST::UiSourceElement *ast) override;
 
-    bool throwSyntaxErrorOnEvalOrArgumentsInStrictMode(QV4::IR::Expr* expr, const AST::SourceLocation &loc);
+    bool throwSyntaxErrorOnEvalOrArgumentsInStrictMode(const Reference &r, const AST::SourceLocation &loc);
     virtual void throwSyntaxError(const AST::SourceLocation &loc, const QString &detail);
     virtual void throwReferenceError(const AST::SourceLocation &loc, const QString &detail);
 
@@ -467,117 +621,47 @@ public:
     QList<QQmlError> qmlErrors() const;
 #endif
 
+    Reference binopHelper(QSOperator::Op oper, Reference &left, Reference &right);
+    Reference jumpBinop(QSOperator::Op oper, Reference &left, Reference &right);
+    struct Arguments { int argc; int argv; };
+    Arguments pushArgs(AST::ArgumentList *args);
+
+    void setUseFastLookups(bool b) { useFastLookups = b; }
+
+    void handleTryCatch(AST::TryStatement *ast);
+    void handleTryFinally(AST::TryStatement *ast);
+
+    QQmlRefPointer<QV4::CompiledData::CompilationUnit> generateCompilationUnit(bool generateUnitData = true);
+    static QQmlRefPointer<QV4::CompiledData::CompilationUnit> createUnitForLoading();
+
+    Context *currentContext() const { return _context; }
+
 protected:
+    friend class ScanFunctions;
+    friend struct ControlFlow;
+    friend struct ControlFlowCatch;
+    friend struct ControlFlowFinally;
     Result _expr;
-    QString _property;
-    UiMember _uiMember;
-    QV4::IR::Module *_module;
-    QV4::IR::Function *_function;
-    QV4::IR::BasicBlock *_block;
-    QV4::IR::BasicBlock *_exitBlock;
-    unsigned _returnAddress;
-    Environment *_variableEnvironment;
-    Loop *_loop;
+    VolatileMemoryLocations _volataleMemoryLocations;
+    Module *_module;
+    int _returnAddress;
+    Context *_context;
     AST::LabelledStatement *_labelledStatement;
-    ScopeAndFinally *_scopeAndFinally;
-    QHash<AST::Node *, Environment *> _envMap;
-    QHash<AST::FunctionExpression *, int> _functionMap;
-    QStack<QV4::IR::BasicBlock *> _exceptionHandlers;
+    QV4::Compiler::JSUnitGenerator *jsUnitGenerator;
+    BytecodeGenerator *bytecodeGenerator = 0;
     bool _strictMode;
+    bool useFastLookups = true;
+    bool requiresReturnValue = false;
 
     bool _fileNameIsUrl;
     bool hasError;
     QList<QQmlJS::DiagnosticMessage> _errors;
 
-    class ScanFunctions: protected Visitor
-    {
-        typedef QV4::TemporaryAssignment<bool> TemporaryBoolAssignment;
-    public:
-        ScanFunctions(Codegen *cg, const QString &sourceCode, CompilationMode defaultProgramMode);
-        void operator()(AST::Node *node);
-
-        void enterEnvironment(AST::Node *node, CompilationMode compilationMode);
-        void leaveEnvironment();
-
-        void enterQmlScope(AST::Node *ast, const QString &name)
-        { enterFunction(ast, name, /*formals*/0, /*body*/0, /*expr*/0, /*isExpression*/false); }
-
-        void enterQmlFunction(AST::FunctionDeclaration *ast)
-        { enterFunction(ast, false, false); }
-
-    protected:
-        using Visitor::visit;
-        using Visitor::endVisit;
-
-        void checkDirectivePrologue(AST::SourceElements *ast);
-
-        void checkName(const QStringRef &name, const AST::SourceLocation &loc);
-        void checkForArguments(AST::FormalParameterList *parameters);
-
-        bool visit(AST::Program *ast) override;
-        void endVisit(AST::Program *) override;
-
-        bool visit(AST::CallExpression *ast) override;
-        bool visit(AST::NewMemberExpression *ast) override;
-        bool visit(AST::ArrayLiteral *ast) override;
-        bool visit(AST::VariableDeclaration *ast) override;
-        bool visit(AST::IdentifierExpression *ast) override;
-        bool visit(AST::ExpressionStatement *ast) override;
-        bool visit(AST::FunctionExpression *ast) override;
-
-        void enterFunction(AST::FunctionExpression *ast, bool enterName, bool isExpression = true);
-
-        void endVisit(AST::FunctionExpression *) override;
-
-        bool visit(AST::ObjectLiteral *ast) override;
-
-        bool visit(AST::PropertyGetterSetter *ast) override;
-        void endVisit(AST::PropertyGetterSetter *) override;
-
-        bool visit(AST::FunctionDeclaration *ast) override;
-        void endVisit(AST::FunctionDeclaration *) override;
-
-        bool visit(AST::WithStatement *ast) override;
-
-        bool visit(AST::DoWhileStatement *ast) override;
-        bool visit(AST::ForStatement *ast) override;
-        bool visit(AST::LocalForStatement *ast) override;
-        bool visit(AST::ForEachStatement *ast) override;
-        bool visit(AST::LocalForEachStatement *ast) override;
-        bool visit(AST::ThisExpression *ast) override;
-
-        bool visit(AST::Block *ast) override;
-
-    protected:
-        void enterFunction(AST::Node *ast, const QString &name, AST::FormalParameterList *formals, AST::FunctionBody *body, AST::FunctionExpression *expr, bool isExpression);
-
-    // fields:
-        Codegen *_cg;
-        const QString _sourceCode;
-        Environment *_variableEnvironment;
-        QStack<Environment *> _envStack;
-
-        bool _allowFuncDecls;
-        CompilationMode defaultProgramMode;
-    };
-
-};
-
-#ifndef V4_BOOTSTRAP
-class RuntimeCodegen : public Codegen
-{
-public:
-    RuntimeCodegen(QV4::ExecutionEngine *engine, bool strict)
-        : Codegen(strict)
-        , engine(engine)
-    {}
-
-    void throwSyntaxError(const AST::SourceLocation &loc, const QString &detail) override;
-    void throwReferenceError(const AST::SourceLocation &loc, const QString &detail) override;
 private:
-    QV4::ExecutionEngine *engine;
+    VolatileMemoryLocations scanVolatileMemoryLocations(AST::Node *ast) const;
 };
-#endif // V4_BOOTSTRAP
+
+}
 
 }
 
diff --git a/src/qml/compiler/qv4compileddata.cpp b/src/qml/compiler/qv4compileddata.cpp
index 292f5cde45..3a1fd7fce5 100644
--- a/src/qml/compiler/qv4compileddata.cpp
+++ b/src/qml/compiler/qv4compileddata.cpp
@@ -38,7 +38,6 @@
 ****************************************************************************/
 
 #include "qv4compileddata_p.h"
-#include "qv4jsir_p.h"
 #include <private/qv4value_p.h>
 #ifndef V4_BOOTSTRAP
 #include <private/qv4engine_p.h>
@@ -50,6 +49,7 @@
 #include <private/qqmlpropertycache_p.h>
 #include <private/qqmltypeloader_p.h>
 #include <private/qqmlengine_p.h>
+#include <private/qv4vme_moth_p.h>
 #include "qv4compilationunitmapper_p.h"
 #include <QQmlPropertyMap>
 #include <QDateTime>
@@ -94,23 +94,10 @@ static QString cacheFilePath(const QUrl &url)
 }
 #endif
 
-#ifndef V4_BOOTSTRAP
 CompilationUnit::CompilationUnit()
-    : data(0)
-    , engine(0)
-    , qmlEngine(0)
-    , runtimeLookups(0)
-    , runtimeRegularExpressions(0)
-    , runtimeClasses(0)
-    , constants(nullptr)
-    , totalBindingsCount(0)
-    , totalParserStatusCount(0)
-    , totalObjectCount(0)
-    , metaTypeId(-1)
-    , listMetaTypeId(-1)
-    , isRegisteredWithEngine(false)
 {}
 
+#ifndef V4_BOOTSTRAP
 CompilationUnit::~CompilationUnit()
 {
     unlink();
@@ -163,10 +150,6 @@ QV4::Function *CompilationUnit::linkToEngine(ExecutionEngine *engine)
                 l->setter = QV4::Lookup::setterGeneric;
             else if (type == CompiledData::Lookup::Type_GlobalGetter)
                 l->globalGetter = QV4::Lookup::globalGetterGeneric;
-            else if (type == CompiledData::Lookup::Type_IndexedGetter)
-                l->indexedGetter = QV4::Lookup::indexedGetterGeneric;
-            else if (type == CompiledData::Lookup::Type_IndexedSetter)
-                l->indexedSetter = QV4::Lookup::indexedSetterGeneric;
 
             for (int j = 0; j < QV4::Lookup::Size; ++j)
                 l->classList[j] = 0;
@@ -201,6 +184,19 @@ QV4::Function *CompilationUnit::linkToEngine(ExecutionEngine *engine)
 
     linkBackendToEngine(engine);
 
+    static const bool showCode = qEnvironmentVariableIsSet("QV4_SHOW_BYTECODE");
+    if (showCode) {
+        qDebug() << "=== Constant table";
+        Moth::dumpConstantTable(constants, data->constantTableSize);
+        qDebug() << "=== String table";
+        for (uint i = 0; i < data->stringTableSize; ++i)
+            qDebug() << "    " << i << ":" << runtimeStrings[i]->toQString();
+        qDebug() << "=== Closure table";
+        for (uint i = 0; i < data->functionTableSize; ++i)
+            qDebug() << "    " << i << ":" << runtimeFunctions[i]->name()->toQString();
+        qDebug() << "root function at index " << (data->indexOfRootFunction != -1 ? data->indexOfRootFunction : 0);
+    }
+
     if (data->indexOfRootFunction != -1)
         return runtimeFunctions[data->indexOfRootFunction];
     else
@@ -260,14 +256,6 @@ void CompilationUnit::markObjects(QV4::MarkStack *markStack)
     }
 }
 
-void CompilationUnit::destroy()
-{
-    if (qmlEngine)
-        QQmlEnginePrivate::deleteInEngineThread(qmlEngine, this);
-    else
-        delete this;
-}
-
 IdentifierHash<int> CompilationUnit::namedObjectsPerComponent(int componentObjectIndex)
 {
     auto it = namedObjectsPerComponentCache.find(componentObjectIndex);
@@ -349,7 +337,7 @@ bool CompilationUnit::verifyChecksum(const DependentTypesHasher &dependencyHashe
                   sizeof(data->dependencyMD5Checksum)) == 0;
 }
 
-bool CompilationUnit::loadFromDisk(const QUrl &url, const QDateTime &sourceTimeStamp, EvalISelFactory *iselFactory, QString *errorString)
+bool CompilationUnit::loadFromDisk(const QUrl &url, const QDateTime &sourceTimeStamp, QString *errorString)
 {
     if (!QQmlFile::isLocalFile(url)) {
         *errorString = QStringLiteral("File has to be a local file.");
@@ -382,26 +370,26 @@ bool CompilationUnit::loadFromDisk(const QUrl &url, const QDateTime &sourceTimeS
 
     {
         const QString foundCodeGenerator = stringAt(data->codeGeneratorIndex);
-        const QString expectedCodeGenerator = iselFactory->codeGeneratorName;
+        const QString expectedCodeGenerator = QStringLiteral("moth"); // ###
         if (foundCodeGenerator != expectedCodeGenerator) {
             *errorString = QString::fromUtf8("Code generator mismatch. Found code generated by %1 but expected %2").arg(foundCodeGenerator).arg(expectedCodeGenerator);
             return false;
         }
     }
 
-    if (!memoryMapCode(errorString))
-        return false;
-
     dataPtrChange.commit();
     free(const_cast<Unit*>(oldDataPtr));
     backingFile.reset(cacheFile.take());
     return true;
 }
 
-bool CompilationUnit::memoryMapCode(QString *errorString)
+void CompilationUnit::linkBackendToEngine(ExecutionEngine *engine)
 {
-    *errorString = QStringLiteral("Missing code mapping backend");
-    return false;
+    runtimeFunctions.resize(data->functionTableSize);
+    for (int i = 0 ;i < runtimeFunctions.size(); ++i) {
+        const QV4::CompiledData::Function *compiledFunction = data->functionAt(i);
+        runtimeFunctions[i] = new QV4::Function(engine, this, compiledFunction, &Moth::VME::exec);
+    }
 }
 
 #endif // V4_BOOTSTRAP
@@ -443,17 +431,12 @@ bool CompilationUnit::saveToDisk(const QUrl &unitUrl, QString *errorString)
     memcpy(&unitPtr, &dataPtr, sizeof(unitPtr));
     unitPtr->flags |= Unit::StaticData;
 
-    prepareCodeOffsetsForDiskStorage(unitPtr);
-
     qint64 headerWritten = cacheFile.write(modifiedUnit);
     if (headerWritten != modifiedUnit.size()) {
         *errorString = cacheFile.errorString();
         return false;
     }
 
-    if (!saveCodeToDisk(&cacheFile, unitPtr, errorString))
-        return false;
-
     if (!cacheFile.commit()) {
         *errorString = cacheFile.errorString();
         return false;
@@ -467,19 +450,6 @@ bool CompilationUnit::saveToDisk(const QUrl &unitUrl, QString *errorString)
 #endif // QT_CONFIG(temporaryfile)
 }
 
-void CompilationUnit::prepareCodeOffsetsForDiskStorage(Unit *unit)
-{
-    Q_UNUSED(unit);
-}
-
-bool CompilationUnit::saveCodeToDisk(QIODevice *device, const Unit *unit, QString *errorString)
-{
-    Q_UNUSED(device);
-    Q_UNUSED(unit);
-    *errorString = QStringLiteral("Saving code to disk is not supported in this configuration");
-    return false;
-}
-
 Unit *CompilationUnit::createUnitData(QmlIR::Document *irDocument)
 {
     if (!irDocument->javaScriptCompilationUnit->data)
@@ -774,6 +744,17 @@ bool ResolvedTypeReferenceMap::addToHash(QCryptographicHash *hash, QQmlEngine *e
 
 #endif
 
+void CompilationUnit::destroy()
+{
+#if !defined(V4_BOOTSTRAP)
+    if (qmlEngine)
+        QQmlEnginePrivate::deleteInEngineThread(qmlEngine, this);
+    else
+#endif
+        delete this;
+}
+
+
 void Unit::generateChecksum()
 {
 #ifndef V4_BOOTSTRAP
diff --git a/src/qml/compiler/qv4compileddata_p.h b/src/qml/compiler/qv4compileddata_p.h
index a83dea1a0a..55c5f1f29f 100644
--- a/src/qml/compiler/qv4compileddata_p.h
+++ b/src/qml/compiler/qv4compileddata_p.h
@@ -72,7 +72,7 @@
 QT_BEGIN_NAMESPACE
 
 // Bump this whenever the compiler data structures change in an incompatible way.
-#define QV4_DATA_STRUCTURE_VERSION 0x13
+#define QV4_DATA_STRUCTURE_VERSION 0x15
 
 class QIODevice;
 class QQmlPropertyCache;
@@ -87,9 +87,6 @@ struct Document;
 }
 
 namespace QV4 {
-namespace IR {
-struct Function;
-}
 
 struct Function;
 class EvalISelFactory;
@@ -155,9 +152,7 @@ struct Lookup
     enum Type : unsigned int {
         Type_Getter = 0x0,
         Type_Setter = 0x1,
-        Type_GlobalGetter = 2,
-        Type_IndexedGetter = 3,
-        Type_IndexedSetter = 4
+        Type_GlobalGetter = 2
     };
 
     union {
@@ -202,6 +197,11 @@ struct String
 };
 static_assert(sizeof(String) == 4, "String structure needs to have the expected size to be binary compatible on disk when generated by host compiler and loaded by target");
 
+struct CodeOffsetToLine {
+    quint32_le codeOffset;
+    quint32_le line;
+};
+
 // Function is aligned on an 8-byte boundary to make sure there are no bus errors or penalties
 // for unaligned access. The ordering of the fields is also from largest to smallest.
 struct Function
@@ -210,22 +210,23 @@ struct Function
         IsStrict            = 0x1,
         HasDirectEval       = 0x2,
         UsesArgumentsObject = 0x4,
-        IsNamedExpression   = 0x8,
-        HasCatchOrWith      = 0x10,
-        CanUseSimpleCall    = 0x20
+//        Unused  = 0x8,
+        HasCatchOrWith      = 0x10
     };
 
-    // Absolute offset into file where the code for this function is located. Only used when the function
-    // is serialized.
-    quint64_le codeOffset;
-    quint64_le codeSize;
+    // Absolute offset into file where the code for this function is located.
+    quint32_le codeOffset;
+    quint32_le codeSize;
 
     quint32_le nameIndex;
     quint32_le nFormals;
     quint32_le formalsOffset;
     quint32_le nLocals;
     quint32_le localsOffset;
+    quint32_le nLineNumbers;
+    quint32_le lineNumberOffset;
     quint32_le nInnerFunctions;
+    quint32_le nRegisters;
     Location location;
 
     // Qml Extensions Begin
@@ -249,6 +250,7 @@ struct Function
 
     const quint32_le *formalsTable() const { return reinterpret_cast<const quint32_le *>(reinterpret_cast<const char *>(this) + formalsOffset); }
     const quint32_le *localsTable() const { return reinterpret_cast<const quint32_le *>(reinterpret_cast<const char *>(this) + localsOffset); }
+    const CodeOffsetToLine *lineNumberTable() const { return reinterpret_cast<const CodeOffsetToLine *>(reinterpret_cast<const char *>(this) + lineNumberOffset); }
     const quint32_le *qmlIdObjectDependencyTable() const { return reinterpret_cast<const quint32_le *>(reinterpret_cast<const char *>(this) + dependingIdObjectsOffset); }
     const quint32_le *qmlContextPropertiesDependencyTable() const { return reinterpret_cast<const quint32_le *>(reinterpret_cast<const char *>(this) + dependingContextPropertiesOffset); }
     const quint32_le *qmlScopePropertiesDependencyTable() const { return reinterpret_cast<const quint32_le *>(reinterpret_cast<const char *>(this) + dependingScopePropertiesOffset); }
@@ -258,13 +260,23 @@ struct Function
     const quint32_le *formalsEnd() const { return formalsTable() + nFormals; }
     // ---
 
+    const uchar *code() const { return reinterpret_cast<const uchar *>(this) + codeOffset; }
+
     inline bool hasQmlDependencies() const { return nDependingIdObjects > 0 || nDependingContextProperties > 0 || nDependingScopeProperties > 0; }
 
-    static int calculateSize(int nFormals, int nLocals, int nInnerfunctions, int nIdObjectDependencies, int nPropertyDependencies) {
-        return (sizeof(Function) + (nFormals + nLocals + nInnerfunctions + nIdObjectDependencies + 2 * nPropertyDependencies) * sizeof(quint32) + 7) & ~0x7;
+    static int calculateSize(int nFormals, int nLocals, int nLines, int nInnerfunctions, int nIdObjectDependencies, int nPropertyDependencies, int codeSize) {
+        int trailingData = (nFormals + nLocals + nInnerfunctions +  nIdObjectDependencies +
+                2 * nPropertyDependencies)*sizeof (quint32) + nLines*sizeof(CodeOffsetToLine);
+        size_t size = align(align(sizeof(Function)) + size_t(trailingData)) + align(codeSize);
+        Q_ASSERT(size < INT_MAX);
+        return int(size);
+    }
+
+    static size_t align(size_t a) {
+        return (a + 7) & ~size_t(7);
     }
 };
-static_assert(sizeof(Function) == 72, "Function structure needs to have the expected size to be binary compatible on disk when generated by host compiler and loaded by target");
+static_assert(sizeof(Function) == 76, "Function structure needs to have the expected size to be binary compatible on disk when generated by host compiler and loaded by target");
 
 // Qml data structures
 
@@ -860,40 +872,59 @@ typedef QVector<QQmlPropertyData*> BindingPropertyData;
 
 struct Q_QML_PRIVATE_EXPORT CompilationUnitBase
 {
-    QV4::Heap::String **runtimeStrings = 0; // Array
+    // pointers either to data->constants() or little-endian memory copy.
+    QV4::Heap::String **runtimeStrings = nullptr; // Array
+    const Value* constants = nullptr;
+    QV4::Value *runtimeRegularExpressions = nullptr;
 };
 
 Q_STATIC_ASSERT(std::is_standard_layout<CompilationUnitBase>::value);
 Q_STATIC_ASSERT(offsetof(CompilationUnitBase, runtimeStrings) == 0);
+Q_STATIC_ASSERT(offsetof(CompilationUnitBase, constants) == sizeof(QV4::Heap::String **));
+Q_STATIC_ASSERT(offsetof(CompilationUnitBase, runtimeRegularExpressions) == offsetof(CompilationUnitBase, constants) + sizeof(const Value *));
 
-struct Q_QML_PRIVATE_EXPORT CompilationUnit : public CompilationUnitBase, public QQmlRefCount
+struct Q_QML_PRIVATE_EXPORT CompilationUnit final : public CompilationUnitBase
 {
+public:
+    CompilationUnit();
 #ifdef V4_BOOTSTRAP
-    CompilationUnit()
-        : data(0)
-    {}
-    virtual ~CompilationUnit() {}
+    ~CompilationUnit() {}
 #else
-    CompilationUnit();
-    virtual ~CompilationUnit();
+    ~CompilationUnit();
 #endif
 
-    const Unit *data;
+    void addref()
+    {
+        Q_ASSERT(refCount.load() > 0);
+        refCount.ref();
+    }
+
+    void release()
+    {
+        Q_ASSERT(refCount.load() > 0);
+        if (!refCount.deref())
+            destroy();
+    }
+    int count() const
+    {
+        return refCount.load();
+    }
+
+    const Unit *data = nullptr;
 
     // Called only when building QML, when we build the header for JS first and append QML data
-    virtual QV4::CompiledData::Unit *createUnitData(QmlIR::Document *irDocument);
+    QV4::CompiledData::Unit *createUnitData(QmlIR::Document *irDocument);
 
 #ifndef V4_BOOTSTRAP
     QIntrusiveListNode nextCompilationUnit;
-    ExecutionEngine *engine;
-    QQmlEnginePrivate *qmlEngine; // only used in QML environment for composite types, not in plain QJSEngine case.
+    ExecutionEngine *engine = nullptr;
+    QQmlEnginePrivate *qmlEngine = nullptr; // only used in QML environment for composite types, not in plain QJSEngine case.
 
     QString fileName() const { return data->stringAt(data->sourceFileIndex); }
     QUrl url() const { if (m_url.isNull) m_url = QUrl(fileName()); return m_url; }
 
-    QV4::Lookup *runtimeLookups;
-    QV4::Value *runtimeRegularExpressions;
-    QV4::InternalClass **runtimeClasses;
+    QV4::Lookup *runtimeLookups = nullptr;
+    QV4::InternalClass **runtimeClasses = nullptr;
     QVector<QV4::Function *> runtimeFunctions;
     mutable QQmlNullableValue<QUrl> m_url;
 
@@ -913,23 +944,20 @@ struct Q_QML_PRIVATE_EXPORT CompilationUnit : public CompilationUnitBase, public
     QHash<int, IdentifierHash<int>> namedObjectsPerComponentCache;
     IdentifierHash<int> namedObjectsPerComponent(int componentObjectIndex);
 
-    // pointers either to data->constants() or little-endian memory copy.
-    const Value* constants;
-
     void finalizeCompositeType(QQmlEnginePrivate *qmlEngine);
 
-    int totalBindingsCount; // Number of bindings used in this type
-    int totalParserStatusCount; // Number of instantiated types that are QQmlParserStatus subclasses
-    int totalObjectCount; // Number of objects explicitly instantiated
+    int totalBindingsCount = 0; // Number of bindings used in this type
+    int totalParserStatusCount = 0; // Number of instantiated types that are QQmlParserStatus subclasses
+    int totalObjectCount = 0; // Number of objects explicitly instantiated
 
     QVector<QQmlScriptData *> dependentScripts;
     ResolvedTypeReferenceMap resolvedTypes;
 
     bool verifyChecksum(const DependentTypesHasher &dependencyHasher) const;
 
-    int metaTypeId;
-    int listMetaTypeId;
-    bool isRegisteredWithEngine;
+    int metaTypeId = -1;
+    int listMetaTypeId = -1;
+    bool isRegisteredWithEngine = false;
 
     QScopedPointer<CompilationUnitMapper> backingFile;
 
@@ -960,25 +988,23 @@ struct Q_QML_PRIVATE_EXPORT CompilationUnit : public CompilationUnitBase, public
 
     void markObjects(MarkStack *markStack);
 
-    void destroy() override;
-
-    bool loadFromDisk(const QUrl &url, const QDateTime &sourceTimeStamp, EvalISelFactory *iselFactory, QString *errorString);
+    bool loadFromDisk(const QUrl &url, const QDateTime &sourceTimeStamp, QString *errorString);
 
 protected:
-    virtual void linkBackendToEngine(QV4::ExecutionEngine *engine) = 0;
-    virtual bool memoryMapCode(QString *errorString);
+    void linkBackendToEngine(QV4::ExecutionEngine *engine);
 #endif // V4_BOOTSTRAP
 
+private:
+    void destroy();
+
+    QAtomicInt refCount = 1;
+
 public:
 #if defined(V4_BOOTSTRAP)
     bool saveToDisk(const QString &outputFileName, QString *errorString);
 #else
     bool saveToDisk(const QUrl &unitUrl, QString *errorString);
 #endif
-
-protected:
-    virtual void prepareCodeOffsetsForDiskStorage(CompiledData::Unit *unit);
-    virtual bool saveCodeToDisk(QIODevice *device, const CompiledData::Unit *unit, QString *errorString);
 };
 
 #ifndef V4_BOOTSTRAP
diff --git a/src/qml/compiler/qv4compiler.cpp b/src/qml/compiler/qv4compiler.cpp
index f02ee728c9..96c9307513 100644
--- a/src/qml/compiler/qv4compiler.cpp
+++ b/src/qml/compiler/qv4compiler.cpp
@@ -39,10 +39,12 @@
 
 #include <qv4compiler_p.h>
 #include <qv4compileddata_p.h>
-#include <qv4isel_p.h>
+#include <qv4codegen_p.h>
 #include <private/qv4string_p.h>
 #include <private/qv4value_p.h>
 #include <private/qv4alloca_p.h>
+#include <private/qqmljslexer_p.h>
+#include <private/qqmljsast_p.h>
 #include <wtf/MathExtras.h>
 #include <QCryptographicHash>
 
@@ -98,70 +100,66 @@ void QV4::Compiler::StringTableGenerator::serialize(CompiledData::Unit *unit)
     }
 }
 
-QV4::Compiler::JSUnitGenerator::JSUnitGenerator(QV4::IR::Module *module)
-    : irModule(module)
+QV4::Compiler::JSUnitGenerator::JSUnitGenerator(QV4::Compiler::Module *module)
+    : module(module)
 {
     // Make sure the empty string always gets index 0
     registerString(QString());
 }
 
-uint QV4::Compiler::JSUnitGenerator::registerIndexedGetterLookup()
+int QV4::Compiler::JSUnitGenerator::registerGetterLookup(const QString &name)
 {
-    CompiledData::Lookup l;
-    l.type_and_flags = CompiledData::Lookup::Type_IndexedGetter;
-    l.nameIndex = 0;
-    lookups << l;
-    return lookups.size() - 1;
+    return registerGetterLookup(registerString(name));
 }
 
-uint QV4::Compiler::JSUnitGenerator::registerIndexedSetterLookup()
+int QV4::Compiler::JSUnitGenerator::registerGetterLookup(int nameIndex)
 {
     CompiledData::Lookup l;
-    l.type_and_flags = CompiledData::Lookup::Type_IndexedSetter;
-    l.nameIndex = 0;
+    l.type_and_flags = CompiledData::Lookup::Type_Getter;
+    l.nameIndex = nameIndex;
     lookups << l;
     return lookups.size() - 1;
 }
 
-uint QV4::Compiler::JSUnitGenerator::registerGetterLookup(const QString &name)
+int QV4::Compiler::JSUnitGenerator::registerSetterLookup(const QString &name)
 {
-    CompiledData::Lookup l;
-    l.type_and_flags = CompiledData::Lookup::Type_Getter;
-    l.nameIndex = registerString(name);
-    lookups << l;
-    return lookups.size() - 1;
+    return registerSetterLookup(registerString(name));
 }
 
-
-uint QV4::Compiler::JSUnitGenerator::registerSetterLookup(const QString &name)
+int QV4::Compiler::JSUnitGenerator::registerSetterLookup(int nameIndex)
 {
     CompiledData::Lookup l;
     l.type_and_flags = CompiledData::Lookup::Type_Setter;
-    l.nameIndex = registerString(name);
+    l.nameIndex = nameIndex;
     lookups << l;
     return lookups.size() - 1;
 }
 
-uint QV4::Compiler::JSUnitGenerator::registerGlobalGetterLookup(const QString &name)
+int QV4::Compiler::JSUnitGenerator::registerGlobalGetterLookup(const QString &name)
+{
+    return registerGlobalGetterLookup(registerString(name));
+}
+
+int QV4::Compiler::JSUnitGenerator::registerGlobalGetterLookup(int nameIndex)
 {
     CompiledData::Lookup l;
     l.type_and_flags = CompiledData::Lookup::Type_GlobalGetter;
-    l.nameIndex = registerString(name);
+    l.nameIndex = nameIndex;
     lookups << l;
     return lookups.size() - 1;
 }
 
-int QV4::Compiler::JSUnitGenerator::registerRegExp(QV4::IR::RegExp *regexp)
+int QV4::Compiler::JSUnitGenerator::registerRegExp(QQmlJS::AST::RegExpLiteral *regexp)
 {
     CompiledData::RegExp re;
-    re.stringIndex = registerString(*regexp->value);
+    re.stringIndex = registerString(regexp->pattern.toString());
 
     re.flags = 0;
-    if (regexp->flags & QV4::IR::RegExp::RegExp_Global)
+    if (regexp->flags & QQmlJS::Lexer::RegExp_Global)
         re.flags |= CompiledData::RegExp::RegExp_Global;
-    if (regexp->flags & QV4::IR::RegExp::RegExp_IgnoreCase)
+    if (regexp->flags &  QQmlJS::Lexer::RegExp_IgnoreCase)
         re.flags |= CompiledData::RegExp::RegExp_IgnoreCase;
-    if (regexp->flags & QV4::IR::RegExp::RegExp_Multiline)
+    if (regexp->flags &  QQmlJS::Lexer::RegExp_Multiline)
         re.flags |= CompiledData::RegExp::RegExp_Multiline;
 
     regexps.append(re);
@@ -177,50 +175,62 @@ int QV4::Compiler::JSUnitGenerator::registerConstant(QV4::ReturnedValue v)
     return constants.size() - 1;
 }
 
-int QV4::Compiler::JSUnitGenerator::registerJSClass(int count, IR::ExprList *args)
+QV4::ReturnedValue QV4::Compiler::JSUnitGenerator::constant(int idx)
+{
+    return constants.at(idx);
+}
+
+int QV4::Compiler::JSUnitGenerator::registerJSClass(const QVector<MemberInfo> &members)
 {
     // ### re-use existing class definitions.
 
-    const int size = CompiledData::JSClass::calculateSize(count);
+    const int size = CompiledData::JSClass::calculateSize(members.size());
     jsClassOffsets.append(jsClassData.size());
     const int oldSize = jsClassData.size();
     jsClassData.resize(jsClassData.size() + size);
     memset(jsClassData.data() + oldSize, 0, size);
 
     CompiledData::JSClass *jsClass = reinterpret_cast<CompiledData::JSClass*>(jsClassData.data() + oldSize);
-    jsClass->nMembers = count;
+    jsClass->nMembers = members.size();
     CompiledData::JSClassMember *member = reinterpret_cast<CompiledData::JSClassMember*>(jsClass + 1);
 
-    IR::ExprList *it = args;
-    for (int i = 0; i < count; ++i, it = it->next, ++member) {
-        QV4::IR::Name *name = it->expr->asName();
-        it = it->next;
+    for (const MemberInfo &memberInfo : members) {
+        member->nameOffset = registerString(memberInfo.name);
+        member->isAccessor = memberInfo.isAccessor;
+        ++member;
+    }
 
-        const bool isData = it->expr->asConst()->value;
-        it = it->next;
+    return jsClassOffsets.size() - 1;
+}
 
-        member->nameOffset = registerString(*name->id);
-        member->isAccessor = !isData;
+int QV4::Compiler::JSUnitGenerator::registerJSClass(int count, CompiledData::JSClassMember *members)
+{
+    const int size = CompiledData::JSClass::calculateSize(count);
+    jsClassOffsets.append(jsClassData.size());
+    const int oldSize = jsClassData.size();
+    jsClassData.resize(jsClassData.size() + size);
+    memset(jsClassData.data() + oldSize, 0, size);
 
-        if (!isData)
-            it = it->next;
-    }
+    CompiledData::JSClass *jsClass = reinterpret_cast<CompiledData::JSClass*>(jsClassData.data() + oldSize);
+    jsClass->nMembers = count;
+    CompiledData::JSClassMember *jsClassMembers = reinterpret_cast<CompiledData::JSClassMember*>(jsClass + 1);
+    memcpy(jsClassMembers, members, sizeof(CompiledData::JSClassMember)*count);
 
     return jsClassOffsets.size() - 1;
 }
 
 QV4::CompiledData::Unit *QV4::Compiler::JSUnitGenerator::generateUnit(GeneratorOption option)
 {
-    registerString(irModule->fileName);
-    for (QV4::IR::Function *f : qAsConst(irModule->functions)) {
-        registerString(*f->name);
-        for (int i = 0; i < f->formals.size(); ++i)
-            registerString(*f->formals.at(i));
+    registerString(module->fileName);
+    for (Context *f : qAsConst(module->functions)) {
+        registerString(f->name);
+        for (int i = 0; i < f->arguments.size(); ++i)
+            registerString(f->arguments.at(i));
         for (int i = 0; i < f->locals.size(); ++i)
-            registerString(*f->locals.at(i));
+            registerString(f->locals.at(i));
     }
 
-    Q_ALLOCA_VAR(quint32_le, functionOffsets, irModule->functions.size() * sizeof(quint32_le));
+    Q_ALLOCA_VAR(quint32_le, functionOffsets, module->functions.size() * sizeof(quint32_le));
     uint jsClassDataOffset = 0;
 
     char *dataPtr;
@@ -235,9 +245,9 @@ QV4::CompiledData::Unit *QV4::Compiler::JSUnitGenerator::generateUnit(GeneratorO
 
     memcpy(dataPtr + unit->offsetToFunctionTable, functionOffsets, unit->functionTableSize * sizeof(quint32_le));
 
-    for (int i = 0; i < irModule->functions.size(); ++i) {
-        QV4::IR::Function *function = irModule->functions.at(i);
-        if (function == irModule->rootFunction)
+    for (int i = 0; i < module->functions.size(); ++i) {
+        Context *function = module->functions.at(i);
+        if (function == module->rootContext)
             unit->indexOfRootFunction = i;
 
         writeFunction(dataPtr + functionOffsets[i], function);
@@ -277,14 +287,14 @@ QV4::CompiledData::Unit *QV4::Compiler::JSUnitGenerator::generateUnit(GeneratorO
     return unit;
 }
 
-void QV4::Compiler::JSUnitGenerator::writeFunction(char *f, QV4::IR::Function *irFunction) const
+void QV4::Compiler::JSUnitGenerator::writeFunction(char *f, QV4::Compiler::Context *irFunction) const
 {
     QV4::CompiledData::Function *function = (QV4::CompiledData::Function *)f;
 
     quint32 currentOffset = sizeof(QV4::CompiledData::Function);
     currentOffset = (currentOffset + 7) & ~quint32(0x7);
 
-    function->nameIndex = getStringId(*irFunction->name);
+    function->nameIndex = getStringId(irFunction->name);
     function->flags = 0;
     if (irFunction->hasDirectEval)
         function->flags |= CompiledData::Function::HasDirectEval;
@@ -292,13 +302,9 @@ void QV4::Compiler::JSUnitGenerator::writeFunction(char *f, QV4::IR::Function *i
         function->flags |= CompiledData::Function::UsesArgumentsObject;
     if (irFunction->isStrict)
         function->flags |= CompiledData::Function::IsStrict;
-    if (irFunction->isNamedExpression)
-        function->flags |= CompiledData::Function::IsNamedExpression;
     if (irFunction->hasTry || irFunction->hasWith)
         function->flags |= CompiledData::Function::HasCatchOrWith;
-    if (irFunction->canUseSimpleCall())
-        function->flags |= CompiledData::Function::CanUseSimpleCall;
-    function->nFormals = irFunction->formals.size();
+    function->nFormals = irFunction->arguments.size();
     function->formalsOffset = currentOffset;
     currentOffset += function->nFormals * sizeof(quint32);
 
@@ -306,7 +312,13 @@ void QV4::Compiler::JSUnitGenerator::writeFunction(char *f, QV4::IR::Function *i
     function->localsOffset = currentOffset;
     currentOffset += function->nLocals * sizeof(quint32);
 
-    function->nInnerFunctions = irFunction->nestedFunctions.size();
+    function->nLineNumbers = irFunction->lineNumberMapping.size();
+    function->lineNumberOffset = currentOffset;
+    currentOffset += function->nLineNumbers * sizeof(CompiledData::CodeOffsetToLine);
+
+    function->nInnerFunctions = irFunction->nestedContexts.size();
+
+    function->nRegisters = irFunction->registerCount;
 
     function->nDependingIdObjects = 0;
     function->nDependingContextProperties = 0;
@@ -333,18 +345,21 @@ void QV4::Compiler::JSUnitGenerator::writeFunction(char *f, QV4::IR::Function *i
     function->location.line = irFunction->line;
     function->location.column = irFunction->column;
 
-    function->codeOffset = 0;
-    function->codeSize = 0;
+    function->codeOffset = currentOffset;
+    function->codeSize = irFunction->code.size();
 
     // write formals
     quint32_le *formals = (quint32_le *)(f + function->formalsOffset);
-    for (int i = 0; i < irFunction->formals.size(); ++i)
-        formals[i] = getStringId(*irFunction->formals.at(i));
+    for (int i = 0; i < irFunction->arguments.size(); ++i)
+        formals[i] = getStringId(irFunction->arguments.at(i));
 
     // write locals
     quint32_le *locals = (quint32_le *)(f + function->localsOffset);
     for (int i = 0; i < irFunction->locals.size(); ++i)
-        locals[i] = getStringId(*irFunction->locals.at(i));
+        locals[i] = getStringId(irFunction->locals.at(i));
+
+    // write line numbers
+    memcpy(f + function->lineNumberOffset, irFunction->lineNumberMapping.constData(), irFunction->lineNumberMapping.size()*sizeof(CompiledData::CodeOffsetToLine));
 
     // write QML dependencies
     quint32_le *writtenDeps = (quint32_le *)(f + function->dependingIdObjectsOffset);
@@ -364,6 +379,9 @@ void QV4::Compiler::JSUnitGenerator::writeFunction(char *f, QV4::IR::Function *i
         *writtenDeps++ = property.key(); // property index
         *writtenDeps++ = property.value(); // notify index
     }
+
+    // write byte code
+    memcpy(f + function->codeOffset, irFunction->code.constData(), irFunction->code.size());
 }
 
 QV4::CompiledData::Unit QV4::Compiler::JSUnitGenerator::generateHeader(QV4::Compiler::JSUnitGenerator::GeneratorOption option, quint32_le *functionOffsets, uint *jsClassDataOffset)
@@ -372,17 +390,17 @@ QV4::CompiledData::Unit QV4::Compiler::JSUnitGenerator::generateHeader(QV4::Comp
     memset(&unit, 0, sizeof(unit));
     memcpy(unit.magic, CompiledData::magic_str, sizeof(unit.magic));
     unit.flags = QV4::CompiledData::Unit::IsJavascript;
-    unit.flags |= irModule->unitFlags;
+    unit.flags |= module->unitFlags;
     unit.version = QV4_DATA_STRUCTURE_VERSION;
     unit.qtVersion = QT_VERSION;
     memset(unit.md5Checksum, 0, sizeof(unit.md5Checksum));
-    unit.architectureIndex = registerString(irModule->targetABI.isEmpty() ? QSysInfo::buildAbi() : irModule->targetABI);
+    unit.architectureIndex = registerString(module->targetABI.isEmpty() ? QSysInfo::buildAbi() : module->targetABI);
     unit.codeGeneratorIndex = registerString(codeGeneratorName);
     memset(unit.dependencyMD5Checksum, 0, sizeof(unit.dependencyMD5Checksum));
 
     quint32 nextOffset = sizeof(CompiledData::Unit);
 
-    unit.functionTableSize = irModule->functions.size();
+    unit.functionTableSize = module->functions.size();
     unit.offsetToFunctionTable = nextOffset;
     nextOffset += unit.functionTableSize * sizeof(uint);
 
@@ -410,13 +428,14 @@ QV4::CompiledData::Unit QV4::Compiler::JSUnitGenerator::generateHeader(QV4::Comp
 
     nextOffset = (nextOffset + 7) & ~quint32(0x7);
 
-    for (int i = 0; i < irModule->functions.size(); ++i) {
-        QV4::IR::Function *f = irModule->functions.at(i);
+    for (int i = 0; i < module->functions.size(); ++i) {
+        Context *f = module->functions.at(i);
         functionOffsets[i] = nextOffset;
 
         const int qmlIdDepsCount = f->idObjectDependencies.count();
         const int qmlPropertyDepsCount = f->scopeObjectPropertyDependencies.count() + f->contextObjectPropertyDependencies.count();
-        nextOffset += QV4::CompiledData::Function::calculateSize(f->formals.size(), f->locals.size(), f->nestedFunctions.size(), qmlIdDepsCount, qmlPropertyDepsCount);
+        nextOffset += QV4::CompiledData::Function::calculateSize(f->arguments.size(), f->locals.size(), f->lineNumberMapping.size(), f->nestedContexts.size(),
+                                                                 qmlIdDepsCount, qmlPropertyDepsCount, f->code.size());
     }
 
     if (option == GenerateWithStringTable) {
@@ -428,8 +447,8 @@ QV4::CompiledData::Unit QV4::Compiler::JSUnitGenerator::generateHeader(QV4::Comp
         unit.offsetToStringTable = 0;
     }
     unit.indexOfRootFunction = -1;
-    unit.sourceFileIndex = getStringId(irModule->fileName);
-    unit.sourceTimeStamp = irModule->sourceTimeStamp.isValid() ? irModule->sourceTimeStamp.toMSecsSinceEpoch() : 0;
+    unit.sourceFileIndex = getStringId(module->fileName);
+    unit.sourceTimeStamp = module->sourceTimeStamp.isValid() ? module->sourceTimeStamp.toMSecsSinceEpoch() : 0;
     unit.nImports = 0;
     unit.offsetToImports = 0;
     unit.nObjects = 0;
diff --git a/src/qml/compiler/qv4compiler_p.h b/src/qml/compiler/qv4compiler_p.h
index 9c51a44bad..360af6540f 100644
--- a/src/qml/compiler/qv4compiler_p.h
+++ b/src/qml/compiler/qv4compiler_p.h
@@ -51,8 +51,11 @@
 //
 
 #include <QtCore/qstring.h>
-#include "qv4jsir_p.h"
-#include <private/qendian_p.h>
+#include <QtCore/qhash.h>
+#include <QtCore/qstringlist.h>
+#include <private/qv4global_p.h>
+#include <private/qqmljsastfwd_p.h>
+#include <private/qv4compileddata_p.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -90,23 +93,31 @@ private:
 };
 
 struct Q_QML_PRIVATE_EXPORT JSUnitGenerator {
-    JSUnitGenerator(IR::Module *module);
+    struct MemberInfo {
+        QString name;
+        bool isAccessor;
+    };
+
+    JSUnitGenerator(Module *module);
 
     int registerString(const QString &str) { return stringTable.registerString(str); }
     int getStringId(const QString &string) const { return stringTable.getStringId(string); }
     QString stringForIndex(int index) const { return stringTable.stringForIndex(index); }
 
-    uint registerGetterLookup(const QString &name);
-    uint registerSetterLookup(const QString &name);
-    uint registerGlobalGetterLookup(const QString &name);
-    uint registerIndexedGetterLookup();
-    uint registerIndexedSetterLookup();
+    int registerGetterLookup(const QString &name);
+    int registerGetterLookup(int nameIndex);
+    int registerSetterLookup(const QString &name);
+    int registerSetterLookup(int nameIndex);
+    int registerGlobalGetterLookup(const QString &name);
+    int registerGlobalGetterLookup(int nameIndex);
 
-    int registerRegExp(IR::RegExp *regexp);
+    int registerRegExp(QQmlJS::AST::RegExpLiteral *regexp);
 
     int registerConstant(ReturnedValue v);
+    ReturnedValue constant(int idx);
 
-    int registerJSClass(int count, IR::ExprList *args);
+    int registerJSClass(const QVector<MemberInfo> &members);
+    int registerJSClass(int count, CompiledData::JSClassMember *members);
 
     enum GeneratorOption {
         GenerateWithStringTable,
@@ -115,14 +126,14 @@ struct Q_QML_PRIVATE_EXPORT JSUnitGenerator {
 
     QV4::CompiledData::Unit *generateUnit(GeneratorOption option = GenerateWithStringTable);
     // Returns bytes written
-    void writeFunction(char *f, IR::Function *irFunction) const;
+    void writeFunction(char *f, Context *irFunction) const;
 
     StringTableGenerator stringTable;
     QString codeGeneratorName;
 private:
     CompiledData::Unit generateHeader(GeneratorOption option, quint32_le *functionOffsets, uint *jsClassDataOffset);
 
-    IR::Module *irModule;
+    Module *module;
 
     QList<CompiledData::Lookup> lookups;
     QVector<CompiledData::RegExp> regexps;
diff --git a/src/qml/compiler/qv4compilercontext.cpp b/src/qml/compiler/qv4compilercontext.cpp
new file mode 100644
index 0000000000..3293dc53c8
--- /dev/null
+++ b/src/qml/compiler/qv4compilercontext.cpp
@@ -0,0 +1,82 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qv4compilercontext_p.h"
+#include "qv4compilercontrolflow_p.h"
+
+QT_USE_NAMESPACE
+using namespace QV4;
+using namespace QV4::Compiler;
+using namespace QQmlJS::AST;
+
+QT_BEGIN_NAMESPACE
+
+Context *Module::newContext(Node *node, Context *parent, CompilationMode compilationMode)
+{
+    Context *c = new Context(parent, compilationMode);
+    if (node) {
+        SourceLocation loc = node->firstSourceLocation();
+        c->line = loc.startLine;
+        c->column = loc.startColumn;
+    }
+
+    contextMap.insert(node, c);
+
+    if (!parent)
+        rootContext = c;
+    else {
+        parent->nestedContexts.append(c);
+        c->isStrict = parent->isStrict;
+    }
+
+    return c;
+}
+
+bool Context::forceLookupByName()
+{
+    ControlFlow *flow = controlFlow;
+    while (flow) {
+        if (flow->needsLookupByName)
+            return true;
+        flow = flow->parent;
+    }
+    return false;
+}
+
+QT_END_NAMESPACE
diff --git a/src/qml/compiler/qv4compilercontext_p.h b/src/qml/compiler/qv4compilercontext_p.h
new file mode 100644
index 0000000000..3db30ea23d
--- /dev/null
+++ b/src/qml/compiler/qv4compilercontext_p.h
@@ -0,0 +1,290 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QV4COMPILERCONTEXT_P_H
+#define QV4COMPILERCONTEXT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "private/qv4global_p.h"
+#include <private/qqmljsast_p.h>
+#include <private/qv4compileddata_p.h>
+#include <QtCore/QStringList>
+#include <QtCore/QDateTime>
+#include <QtCore/QStack>
+#include <QtCore/QHash>
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+namespace Compiler {
+
+struct ControlFlow;
+
+enum CompilationMode {
+    GlobalCode,
+    EvalCode,
+    FunctionCode,
+    QmlBinding // This is almost the same as EvalCode, except:
+               //  * function declarations are moved to the return address when encountered
+               //  * return statements are allowed everywhere (like in FunctionCode)
+               //  * variable declarations are treated as true locals (like in FunctionCode)
+};
+
+struct Context;
+
+struct Module {
+    Module(bool debugMode)
+        : debugMode(debugMode)
+    {}
+    ~Module() {
+        qDeleteAll(contextMap);
+    }
+
+    Context *newContext(QQmlJS::AST::Node *node, Context *parent, CompilationMode compilationMode);
+
+    QHash<QQmlJS::AST::Node *, Context *> contextMap;
+    QList<Context *> functions;
+    Context *rootContext;
+    QString fileName;
+    QDateTime sourceTimeStamp;
+    uint unitFlags = 0; // flags merged into CompiledData::Unit::flags
+    bool debugMode = false;
+    QString targetABI; // ### seems unused currently
+};
+
+
+struct Context {
+    Context *parent;
+    QString name;
+    int line = 0;
+    int column = 0;
+    int registerCount = 0;
+    int functionIndex = -1;
+
+    enum MemberType {
+        UndefinedMember,
+        ThisFunctionName,
+        VariableDefinition,
+        VariableDeclaration,
+        FunctionDefinition
+    };
+
+    struct Member {
+        MemberType type = UndefinedMember;
+        int index = -1;
+        QQmlJS::AST::VariableDeclaration::VariableScope scope = QQmlJS::AST::VariableDeclaration::FunctionScope;
+        mutable bool canEscape = false;
+        QQmlJS::AST::FunctionExpression *function = 0;
+
+        bool isLexicallyScoped() const { return this->scope != QQmlJS::AST::VariableDeclaration::FunctionScope; }
+    };
+    typedef QMap<QString, Member> MemberMap;
+
+    MemberMap members;
+    QSet<QString> usedVariables;
+    QQmlJS::AST::FormalParameterList *formals = 0;
+    QStringList arguments;
+    QStringList locals;
+    QVector<Context *> nestedContexts;
+
+    ControlFlow *controlFlow = 0;
+    QByteArray code;
+    QVector<CompiledData::CodeOffsetToLine> lineNumberMapping;
+
+    int maxNumberOfArguments = 0;
+    bool hasDirectEval = false;
+    bool hasNestedFunctions = false;
+    bool isStrict = false;
+    bool usesThis = false;
+    bool hasTry = false;
+    bool hasWith = false;
+    mutable bool argumentsCanEscape = false;
+
+    enum UsesArgumentsObject {
+        ArgumentsObjectUnknown,
+        ArgumentsObjectNotUsed,
+        ArgumentsObjectUsed
+    };
+
+    UsesArgumentsObject usesArgumentsObject = ArgumentsObjectUnknown;
+
+    CompilationMode compilationMode;
+
+    template <typename T>
+    class SmallSet: public QVarLengthArray<T, 8>
+    {
+    public:
+        void insert(int value)
+        {
+            for (auto it : *this) {
+                if (it == value)
+                    return;
+            }
+            this->append(value);
+        }
+    };
+
+    // Map from meta property index (existence implies dependency) to notify signal index
+    struct KeyValuePair
+    {
+        quint32 _key;
+        quint32 _value;
+
+        KeyValuePair(): _key(0), _value(0) {}
+        KeyValuePair(quint32 key, quint32 value): _key(key), _value(value) {}
+
+        quint32 key() const { return _key; }
+        quint32 value() const { return _value; }
+    };
+
+    class PropertyDependencyMap: public QVarLengthArray<KeyValuePair, 8>
+    {
+    public:
+        void insert(quint32 key, quint32 value)
+        {
+            for (auto it = begin(), eit = end(); it != eit; ++it) {
+                if (it->_key == key) {
+                    it->_value = value;
+                    return;
+                }
+            }
+            append(KeyValuePair(key, value));
+        }
+    };
+
+    // Qml extension:
+    SmallSet<int> idObjectDependencies;
+    PropertyDependencyMap contextObjectPropertyDependencies;
+    PropertyDependencyMap scopeObjectPropertyDependencies;
+
+    Context(Context *parent, CompilationMode mode)
+        : parent(parent)
+        , compilationMode(mode)
+    {
+        if (parent && parent->isStrict)
+            isStrict = true;
+    }
+
+    bool forceLookupByName();
+
+
+    bool canUseSimpleCall() const {
+        return nestedContexts.isEmpty() &&
+               locals.isEmpty() &&
+               !hasTry && !hasWith &&
+               (usesArgumentsObject == ArgumentsObjectNotUsed || isStrict) && !hasDirectEval;
+    }
+
+    int findArgument(const QString &name)
+    {
+        // search backwards to handle duplicate argument names correctly
+        for (int i = arguments.size() - 1; i >= 0; --i) {
+            if (arguments.at(i) == name)
+                return i;
+        }
+        return -1;
+    }
+
+    Member findMember(const QString &name) const
+    {
+        MemberMap::const_iterator it = members.find(name);
+        if (it == members.end())
+            return Member();
+        Q_ASSERT(it->index != -1 || !parent);
+        return (*it);
+    }
+
+    bool memberInfo(const QString &name, const Member **m) const
+    {
+        Q_ASSERT(m);
+        MemberMap::const_iterator it = members.find(name);
+        if (it == members.end()) {
+            *m = 0;
+            return false;
+        }
+        *m = &(*it);
+        return true;
+    }
+
+    void addUsedVariable(const QString &name) {
+        usedVariables.insert(name);
+    }
+
+    void addLocalVar(const QString &name, MemberType type, QQmlJS::AST::VariableDeclaration::VariableScope scope, QQmlJS::AST::FunctionExpression *function = 0)
+    {
+        if (! name.isEmpty()) {
+            if (type != FunctionDefinition) {
+                for (QQmlJS::AST::FormalParameterList *it = formals; it; it = it->next)
+                    if (it->name == name)
+                        return;
+            }
+            MemberMap::iterator it = members.find(name);
+            if (it == members.end()) {
+                Member m;
+                m.type = type;
+                m.function = function;
+                m.scope = scope;
+                members.insert(name, m);
+            } else {
+                Q_ASSERT(scope == (*it).scope);
+                if ((*it).type <= type) {
+                    (*it).type = type;
+                    (*it).function = function;
+                }
+            }
+        }
+    }
+};
+
+
+} } // namespace QV4::Compiler
+
+QT_END_NAMESPACE
+
+#endif // QV4CODEGEN_P_H
diff --git a/src/qml/compiler/qv4compilercontrolflow_p.h b/src/qml/compiler/qv4compilercontrolflow_p.h
new file mode 100644
index 0000000000..13716fe29f
--- /dev/null
+++ b/src/qml/compiler/qv4compilercontrolflow_p.h
@@ -0,0 +1,467 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QV4COMPILERCONTROLFLOW_P_H
+#define QV4COMPILERCONTROLFLOW_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <private/qv4global_p.h>
+#include <private/qv4codegen_p.h>
+#include <private/qqmljsast_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+namespace Compiler {
+
+struct ControlFlow {
+    using Reference = Codegen::Reference;
+    using BytecodeGenerator = Moth::BytecodeGenerator;
+    using Instruction = Moth::Instruction;
+
+    enum Type {
+        Loop,
+        With,
+        Finally,
+        Catch
+    };
+
+    enum HandlerType {
+        Invalid,
+        Break,
+        Continue,
+        Return,
+        Throw
+    };
+
+    struct Handler {
+        HandlerType type;
+        QString label;
+        BytecodeGenerator::Label linkLabel;
+        int tempIndex;
+        int value;
+    };
+
+    Codegen *cg;
+    ControlFlow *parent;
+    Type type;
+    bool needsLookupByName = false;
+
+    ControlFlow(Codegen *cg, Type type)
+        : cg(cg), parent(cg->_context->controlFlow), type(type)
+    {
+        cg->_context->controlFlow = this;
+    }
+
+    virtual ~ControlFlow() {
+        cg->_context->controlFlow = parent;
+    }
+
+    void emitReturnStatement() const {
+        if (cg->_returnAddress >= 0) {
+            Instruction::LoadReg load;
+            load.reg = Moth::StackSlot::createRegister(cg->_returnAddress);
+            generator()->addInstruction(load);
+        }
+        Instruction::Ret ret;
+        cg->bytecodeGenerator->addInstruction(ret);
+    }
+
+    void jumpToHandler(const Handler &h) {
+        if (h.linkLabel.isReturn()) {
+            emitReturnStatement();
+        } else {
+            if (h.tempIndex >= 0)
+                Reference::storeConstOnStack(cg, QV4::Encode(h.value), h.tempIndex);
+            cg->bytecodeGenerator->jump().link(h.linkLabel);
+        }
+    }
+
+    bool returnRequiresUnwind() const {
+        const ControlFlow *f = this;
+        while (f) {
+            if (f->type == Finally)
+                return true;
+            f = f->parent;
+        }
+        return false;
+    }
+
+    virtual QString label() const { return QString(); }
+
+    bool isSimple() const {
+        return type == Loop;
+    }
+
+    Handler getParentHandler(HandlerType type, const QString &label = QString()) {
+        if (parent)
+            return parent->getHandler(type, label);
+        switch (type) {
+        case Break:
+        case Continue:
+            return { Invalid, QString(), {}, -1, 0 };
+        case Return:
+        case Throw:
+            return { type, QString(), BytecodeGenerator::Label::returnLabel(), -1, 0 };
+        case Invalid:
+            break;
+        }
+        Q_ASSERT(false);
+        Q_UNREACHABLE();
+    }
+
+    virtual Handler getHandler(HandlerType type, const QString &label = QString()) = 0;
+
+    BytecodeGenerator::ExceptionHandler *parentExceptionHandler() {
+        return parent ? parent->exceptionHandler() : 0;
+    }
+
+    virtual BytecodeGenerator::ExceptionHandler *exceptionHandler() {
+        return parentExceptionHandler();
+    }
+
+
+    virtual void handleThrow(const Reference &expr) {
+        Reference e = expr;
+        Handler h = getHandler(ControlFlow::Throw);
+        if (h.tempIndex >= 0) {
+            e = e.storeOnStack();
+            Reference::storeConstOnStack(cg, QV4::Encode(h.value), h.tempIndex);
+        }
+        e.loadInAccumulator();
+        Instruction::ThrowException instr;
+        generator()->addInstruction(instr);
+    }
+
+protected:
+    QString loopLabel() const {
+        QString label;
+        if (cg->_labelledStatement) {
+            label = cg->_labelledStatement->label.toString();
+            cg->_labelledStatement = 0;
+        }
+        return label;
+    }
+    BytecodeGenerator *generator() const {
+        return cg->bytecodeGenerator;
+    }
+};
+
+struct ControlFlowLoop : public ControlFlow
+{
+    QString loopLabel;
+    BytecodeGenerator::Label *breakLabel = 0;
+    BytecodeGenerator::Label *continueLabel = 0;
+
+    ControlFlowLoop(Codegen *cg, BytecodeGenerator::Label *breakLabel, BytecodeGenerator::Label *continueLabel = 0)
+        : ControlFlow(cg, Loop), loopLabel(ControlFlow::loopLabel()), breakLabel(breakLabel), continueLabel(continueLabel)
+    {
+    }
+
+    virtual QString label() const { return loopLabel; }
+
+    virtual Handler getHandler(HandlerType type, const QString &label = QString()) {
+        switch (type) {
+        case Break:
+            if (breakLabel && (label.isEmpty() || label == loopLabel))
+                return { type, loopLabel, *breakLabel, -1, 0 };
+            break;
+        case Continue:
+            if (continueLabel && (label.isEmpty() || label == loopLabel))
+                return { type, loopLabel, *continueLabel, -1, 0 };
+            break;
+        case Return:
+        case Throw:
+            break;
+        case Invalid:
+            Q_ASSERT(false);
+            Q_UNREACHABLE();
+        }
+        return getParentHandler(type, label);
+    }
+
+};
+
+struct ControlFlowUnwind : public ControlFlow
+{
+    BytecodeGenerator::ExceptionHandler unwindLabel;
+    int controlFlowTemp;
+    QVector<Handler> handlers;
+
+    ControlFlowUnwind(Codegen *cg, Type type)
+        : ControlFlow(cg, type), unwindLabel(generator()->newExceptionHandler())
+    {
+        Q_ASSERT(type != Loop);
+        controlFlowTemp = static_cast<int>(generator()->newRegister());
+        Reference::storeConstOnStack(cg, QV4::Encode::undefined(), controlFlowTemp);
+        // we'll need at least a handler for throw
+        getHandler(Throw);
+    }
+
+    void emitUnwindHandler()
+    {
+        Q_ASSERT(!isSimple());
+
+        Reference temp = Reference::fromStackSlot(cg, controlFlowTemp);
+        for (const auto &h : qAsConst(handlers)) {
+            Handler parentHandler = getParentHandler(h.type, h.label);
+
+            if (h.type == Throw || parentHandler.tempIndex >= 0) {
+                BytecodeGenerator::Label skip = generator()->newLabel();
+                generator()->jumpStrictNotEqualStackSlotInt(temp.stackSlot(), h.value).link(skip);
+                if (h.type == Throw)
+                    emitForThrowHandling();
+                jumpToHandler(parentHandler);
+                skip.link();
+            } else {
+                if (parentHandler.linkLabel.isReturn()) {
+                    BytecodeGenerator::Label skip = generator()->newLabel();
+                    generator()->jumpStrictNotEqualStackSlotInt(temp.stackSlot(), h.value).link(skip);
+                    emitReturnStatement();
+                    skip.link();
+                } else {
+                   generator()->jumpStrictEqualStackSlotInt(temp.stackSlot(), h.value).link(parentHandler.linkLabel);
+                }
+            }
+        }
+    }
+
+    virtual Handler getHandler(HandlerType type, const QString &label = QString()) {
+        for (const auto &h : qAsConst(handlers)) {
+            if (h.type == type && h.label == label)
+                return h;
+        }
+        Handler h = {
+            type,
+            label,
+            unwindLabel,
+            controlFlowTemp,
+            handlers.size()
+        };
+        handlers.append(h);
+        return h;
+    }
+
+    virtual BytecodeGenerator::ExceptionHandler *exceptionHandler() {
+        return &unwindLabel;
+    }
+
+    virtual void emitForThrowHandling() { }
+};
+
+struct ControlFlowWith : public ControlFlowUnwind
+{
+    ControlFlowWith(Codegen *cg)
+        : ControlFlowUnwind(cg, With)
+    {
+        needsLookupByName = true;
+
+        savedContextRegister = Moth::StackSlot::createRegister(generator()->newRegister());
+
+        // assumes the with object is in the accumulator
+        Instruction::PushWithContext pushScope;
+        pushScope.reg = savedContextRegister;
+        generator()->addInstruction(pushScope);
+        generator()->setExceptionHandler(&unwindLabel);
+    }
+
+    virtual ~ControlFlowWith() {
+        // emit code for unwinding
+        unwindLabel.link();
+
+        generator()->setExceptionHandler(parentExceptionHandler());
+        Instruction::PopContext pop;
+        pop.reg = savedContextRegister;
+        generator()->addInstruction(pop);
+
+        emitUnwindHandler();
+    }
+    Moth::StackSlot savedContextRegister;
+};
+
+struct ControlFlowCatch : public ControlFlowUnwind
+{
+    AST::Catch *catchExpression;
+    bool insideCatch = false;
+    BytecodeGenerator::ExceptionHandler exceptionLabel;
+    BytecodeGenerator::ExceptionHandler catchUnwindLabel;
+
+    ControlFlowCatch(Codegen *cg, AST::Catch *catchExpression)
+        : ControlFlowUnwind(cg, Catch), catchExpression(catchExpression),
+          exceptionLabel(generator()->newExceptionHandler()),
+          catchUnwindLabel(generator()->newExceptionHandler())
+    {
+        generator()->setExceptionHandler(&exceptionLabel);
+    }
+
+    virtual Handler getHandler(HandlerType type, const QString &label = QString()) {
+        Handler h = getParentHandler(type, label);
+        if (h.type == Invalid)
+            return h;
+        h = ControlFlowUnwind::getHandler(type, label);
+        if (insideCatch)
+            // if we're inside the catch block, we need to jump to the pop scope
+            // instruction at the end of the catch block, not the unwind handler
+            h.linkLabel = catchUnwindLabel;
+        else if (type == Throw)
+            // if we're inside the try block, we need to jump to the catch block,
+            // not the unwind handler
+            h.linkLabel = exceptionLabel;
+        return h;
+    }
+
+    virtual BytecodeGenerator::ExceptionHandler *exceptionHandler() {
+        return insideCatch ? &catchUnwindLabel : &exceptionLabel;
+    }
+
+    ~ControlFlowCatch() {
+        // emit code for unwinding
+
+        needsLookupByName = true;
+        insideCatch = true;
+
+        Codegen::RegisterScope scope(cg);
+
+        // exceptions inside the try block go here
+        exceptionLabel.link();
+        Moth::StackSlot savedContextReg = Moth::StackSlot::createRegister(generator()->newRegister());
+        Instruction::PushCatchContext pushCatch;
+        pushCatch.name = cg->registerString(catchExpression->name.toString());
+        pushCatch.reg = savedContextReg;
+        generator()->addInstruction(pushCatch);
+        // clear the unwind temp for exceptions, we want to resume normal code flow afterwards
+        Reference::storeConstOnStack(cg, QV4::Encode::undefined(), controlFlowTemp);
+        generator()->setExceptionHandler(&catchUnwindLabel);
+
+        cg->statement(catchExpression->statement);
+
+        insideCatch = false;
+        needsLookupByName = false;
+
+        // exceptions inside catch and break/return statements go here
+        catchUnwindLabel.link();
+        Instruction::PopContext pop;
+        pop.reg = savedContextReg;
+        generator()->addInstruction(pop);
+
+        // break/continue/return statements in try go here
+        unwindLabel.link();
+        generator()->setExceptionHandler(parentExceptionHandler());
+
+        emitUnwindHandler();
+    }
+};
+
+struct ControlFlowFinally : public ControlFlowUnwind
+{
+    AST::Finally *finally;
+    bool insideFinally = false;
+    int exceptionTemp = -1;
+
+    ControlFlowFinally(Codegen *cg, AST::Finally *finally)
+        : ControlFlowUnwind(cg, Finally), finally(finally)
+    {
+        Q_ASSERT(finally != 0);
+        generator()->setExceptionHandler(&unwindLabel);
+    }
+
+    virtual Handler getHandler(HandlerType type, const QString &label = QString()) {
+        // if we're inside the finally block, any exceptions etc. should
+        // go directly to the parent handler
+        if (insideFinally)
+            return getParentHandler(type, label);
+        return ControlFlowUnwind::getHandler(type, label);
+    }
+
+    virtual BytecodeGenerator::ExceptionHandler *exceptionHandler() {
+        return insideFinally ? parentExceptionHandler() : ControlFlowUnwind::exceptionHandler();
+    }
+
+    ~ControlFlowFinally() {
+        // emit code for unwinding
+        unwindLabel.link();
+
+        Codegen::RegisterScope scope(cg);
+
+        Moth::StackSlot retVal = Moth::StackSlot::createRegister(generator()->newRegister());
+        Instruction::StoreReg storeRetVal;
+        storeRetVal.reg = retVal;
+        generator()->addInstruction(storeRetVal);
+
+        insideFinally = true;
+        exceptionTemp = generator()->newRegister();
+        Instruction::GetException instr;
+        generator()->addInstruction(instr);
+        Reference::fromStackSlot(cg, exceptionTemp).storeConsumeAccumulator();
+
+        generator()->setExceptionHandler(parentExceptionHandler());
+        cg->statement(finally->statement);
+        insideFinally = false;
+
+        Instruction::LoadReg loadRetVal;
+        loadRetVal.reg = retVal;
+        generator()->addInstruction(loadRetVal);
+
+        emitUnwindHandler();
+    }
+
+    virtual void emitForThrowHandling() {
+        // reset the exception flag, that got cleared before executing the statements in finally
+        Reference::fromStackSlot(cg, exceptionTemp).loadInAccumulator();
+        Instruction::SetException setException;
+        Q_ASSERT(exceptionTemp != -1);
+        generator()->addInstruction(setException);
+    }
+};
+
+} } // QV4::Compiler namespace
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/qml/compiler/qv4compilerscanfunctions.cpp b/src/qml/compiler/qv4compilerscanfunctions.cpp
new file mode 100644
index 0000000000..6a9b064bd8
--- /dev/null
+++ b/src/qml/compiler/qv4compilerscanfunctions.cpp
@@ -0,0 +1,475 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qv4compilerscanfunctions_p.h"
+
+#include <QtCore/QCoreApplication>
+#include <QtCore/QStringList>
+#include <QtCore/QSet>
+#include <QtCore/QBuffer>
+#include <QtCore/QBitArray>
+#include <QtCore/QLinkedList>
+#include <QtCore/QStack>
+#include <private/qqmljsast_p.h>
+#include <private/qv4compilercontext_p.h>
+#include <private/qv4codegen_p.h>
+#include <private/qv4string_p.h>
+
+QT_USE_NAMESPACE
+using namespace QV4;
+using namespace QV4::Compiler;
+using namespace QQmlJS::AST;
+
+ScanFunctions::ScanFunctions(Codegen *cg, const QString &sourceCode, CompilationMode defaultProgramMode)
+    : _cg(cg)
+    , _sourceCode(sourceCode)
+    , _context(0)
+    , _allowFuncDecls(true)
+    , defaultProgramMode(defaultProgramMode)
+{
+}
+
+void ScanFunctions::operator()(Node *node)
+{
+    if (node)
+        node->accept(this);
+
+    calcEscapingVariables();
+}
+
+void ScanFunctions::enterEnvironment(Node *node, CompilationMode compilationMode)
+{
+    Context *e = _cg->_module->newContext(node, _context, compilationMode);
+    if (!e->isStrict)
+        e->isStrict = _cg->_strictMode;
+    _contextStack.append(e);
+    _context = e;
+}
+
+void ScanFunctions::leaveEnvironment()
+{
+    _contextStack.pop();
+    _context = _contextStack.isEmpty() ? 0 : _contextStack.top();
+}
+
+void ScanFunctions::checkDirectivePrologue(SourceElements *ast)
+{
+    for (SourceElements *it = ast; it; it = it->next) {
+        if (StatementSourceElement *stmt = cast<StatementSourceElement *>(it->element)) {
+            if (ExpressionStatement *expr = cast<ExpressionStatement *>(stmt->statement)) {
+                if (StringLiteral *strLit = cast<StringLiteral *>(expr->expression)) {
+                    // Use the source code, because the StringLiteral's
+                    // value might have escape sequences in it, which is not
+                    // allowed.
+                    if (strLit->literalToken.length < 2)
+                        continue;
+                    QStringRef str = _sourceCode.midRef(strLit->literalToken.offset + 1, strLit->literalToken.length - 2);
+                    if (str == QLatin1String("use strict")) {
+                        _context->isStrict = true;
+                    } else {
+                        // TODO: give a warning.
+                    }
+                    continue;
+                }
+            }
+        }
+
+        break;
+    }
+}
+
+void ScanFunctions::checkName(const QStringRef &name, const SourceLocation &loc)
+{
+    if (_context->isStrict) {
+        if (name == QLatin1String("implements")
+                || name == QLatin1String("interface")
+                || name == QLatin1String("let")
+                || name == QLatin1String("package")
+                || name == QLatin1String("private")
+                || name == QLatin1String("protected")
+                || name == QLatin1String("public")
+                || name == QLatin1String("static")
+                || name == QLatin1String("yield")) {
+            _cg->throwSyntaxError(loc, QStringLiteral("Unexpected strict mode reserved word"));
+        }
+    }
+}
+void ScanFunctions::checkForArguments(AST::FormalParameterList *parameters)
+{
+    while (parameters) {
+        if (parameters->name == QLatin1String("arguments"))
+            _context->usesArgumentsObject = Context::ArgumentsObjectNotUsed;
+        parameters = parameters->next;
+    }
+}
+
+bool ScanFunctions::visit(Program *ast)
+{
+    enterEnvironment(ast, defaultProgramMode);
+    checkDirectivePrologue(ast->elements);
+    return true;
+}
+
+void ScanFunctions::endVisit(Program *)
+{
+    leaveEnvironment();
+}
+
+bool ScanFunctions::visit(CallExpression *ast)
+{
+    if (! _context->hasDirectEval) {
+        if (IdentifierExpression *id = cast<IdentifierExpression *>(ast->base)) {
+            if (id->name == QLatin1String("eval")) {
+                if (_context->usesArgumentsObject == Context::ArgumentsObjectUnknown)
+                    _context->usesArgumentsObject = Context::ArgumentsObjectUsed;
+                _context->hasDirectEval = true;
+            }
+        }
+    }
+    int argc = 0;
+    for (ArgumentList *it = ast->arguments; it; it = it->next)
+        ++argc;
+    _context->maxNumberOfArguments = qMax(_context->maxNumberOfArguments, argc);
+    return true;
+}
+
+bool ScanFunctions::visit(NewMemberExpression *ast)
+{
+    int argc = 0;
+    for (ArgumentList *it = ast->arguments; it; it = it->next)
+        ++argc;
+    _context->maxNumberOfArguments = qMax(_context->maxNumberOfArguments, argc);
+    return true;
+}
+
+bool ScanFunctions::visit(ArrayLiteral *ast)
+{
+    int index = 0;
+    for (ElementList *it = ast->elements; it; it = it->next) {
+        for (Elision *elision = it->elision; elision; elision = elision->next)
+            ++index;
+        ++index;
+    }
+    if (ast->elision) {
+        for (Elision *elision = ast->elision->next; elision; elision = elision->next)
+            ++index;
+    }
+    _context->maxNumberOfArguments = qMax(_context->maxNumberOfArguments, index);
+    return true;
+}
+
+bool ScanFunctions::visit(VariableDeclaration *ast)
+{
+    if (_context->isStrict && (ast->name == QLatin1String("eval") || ast->name == QLatin1String("arguments")))
+        _cg->throwSyntaxError(ast->identifierToken, QStringLiteral("Variable name may not be eval or arguments in strict mode"));
+    checkName(ast->name, ast->identifierToken);
+    if (ast->name == QLatin1String("arguments"))
+        _context->usesArgumentsObject = Context::ArgumentsObjectNotUsed;
+    if (ast->scope == AST::VariableDeclaration::VariableScope::ReadOnlyBlockScope && !ast->expression) {
+        _cg->throwSyntaxError(ast->identifierToken, QStringLiteral("Missing initializer in const declaration"));
+        return false;
+    }
+    QString name = ast->name.toString();
+    const Context::Member *m = 0;
+    if (_context->memberInfo(name, &m)) {
+        if (m->isLexicallyScoped() || ast->isLexicallyScoped()) {
+            _cg->throwSyntaxError(ast->identifierToken, QStringLiteral("Identifier %1 has already been declared").arg(name));
+            return false;
+        }
+    }
+    _context->addLocalVar(ast->name.toString(), ast->expression ? Context::VariableDefinition : Context::VariableDeclaration, ast->scope);
+    return true;
+}
+
+bool ScanFunctions::visit(IdentifierExpression *ast)
+{
+    checkName(ast->name, ast->identifierToken);
+    if (_context->usesArgumentsObject == Context::ArgumentsObjectUnknown && ast->name == QLatin1String("arguments"))
+        _context->usesArgumentsObject = Context::ArgumentsObjectUsed;
+    _context->addUsedVariable(ast->name.toString());
+    return true;
+}
+
+bool ScanFunctions::visit(ExpressionStatement *ast)
+{
+    if (FunctionExpression* expr = AST::cast<AST::FunctionExpression*>(ast->expression)) {
+        if (!_allowFuncDecls)
+            _cg->throwSyntaxError(expr->functionToken, QStringLiteral("conditional function or closure declaration"));
+
+        enterFunction(expr, /*enterName*/ true);
+        Node::accept(expr->formals, this);
+        Node::accept(expr->body, this);
+        leaveEnvironment();
+        return false;
+    } else {
+        SourceLocation firstToken = ast->firstSourceLocation();
+        if (_sourceCode.midRef(firstToken.offset, firstToken.length) == QLatin1String("function")) {
+            _cg->throwSyntaxError(firstToken, QStringLiteral("unexpected token"));
+        }
+    }
+    return true;
+}
+
+bool ScanFunctions::visit(FunctionExpression *ast)
+{
+    enterFunction(ast, /*enterName*/ false);
+    return true;
+}
+
+void ScanFunctions::enterFunction(FunctionExpression *ast, bool enterName)
+{
+    if (_context->isStrict && (ast->name == QLatin1String("eval") || ast->name == QLatin1String("arguments")))
+        _cg->throwSyntaxError(ast->identifierToken, QStringLiteral("Function name may not be eval or arguments in strict mode"));
+    enterFunction(ast, ast->name.toString(), ast->formals, ast->body, enterName ? ast : 0);
+}
+
+void ScanFunctions::endVisit(FunctionExpression *)
+{
+    leaveEnvironment();
+}
+
+bool ScanFunctions::visit(ObjectLiteral *ast)
+{
+    int argc = 0;
+    for (PropertyAssignmentList *it = ast->properties; it; it = it->next) {
+        QString key = it->assignment->name->asString();
+        if (QV4::String::toArrayIndex(key) != UINT_MAX)
+            ++argc;
+        ++argc;
+        if (AST::cast<AST::PropertyGetterSetter *>(it->assignment))
+            ++argc;
+    }
+    _context->maxNumberOfArguments = qMax(_context->maxNumberOfArguments, argc);
+
+    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, true);
+    Node::accept(ast->properties, this);
+    return false;
+}
+
+bool ScanFunctions::visit(PropertyGetterSetter *ast)
+{
+    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, true);
+    enterFunction(ast, QString(), ast->formals, ast->functionBody, /*FunctionExpression*/0);
+    return true;
+}
+
+void ScanFunctions::endVisit(PropertyGetterSetter *)
+{
+    leaveEnvironment();
+}
+
+bool ScanFunctions::visit(FunctionDeclaration *ast)
+{
+    enterFunction(ast, /*enterName*/ true);
+    return true;
+}
+
+void ScanFunctions::endVisit(FunctionDeclaration *)
+{
+    leaveEnvironment();
+}
+
+bool ScanFunctions::visit(TryStatement *)
+{
+    // ### should limit to catch(), as try{} finally{} should be ok without
+    _context->hasTry = true;
+    return true;
+}
+
+bool ScanFunctions::visit(WithStatement *ast)
+{
+    if (_context->isStrict) {
+        _cg->throwSyntaxError(ast->withToken, QStringLiteral("'with' statement is not allowed in strict mode"));
+        return false;
+    }
+
+    _context->hasWith = true;
+    return true;
+}
+
+bool ScanFunctions::visit(DoWhileStatement *ast) {
+    {
+        TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, !_context->isStrict);
+        Node::accept(ast->statement, this);
+    }
+    Node::accept(ast->expression, this);
+    return false;
+}
+
+bool ScanFunctions::visit(ForStatement *ast) {
+    Node::accept(ast->initialiser, this);
+    Node::accept(ast->condition, this);
+    Node::accept(ast->expression, this);
+
+    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, !_context->isStrict);
+    Node::accept(ast->statement, this);
+
+    return false;
+}
+
+bool ScanFunctions::visit(LocalForStatement *ast) {
+    Node::accept(ast->declarations, this);
+    Node::accept(ast->condition, this);
+    Node::accept(ast->expression, this);
+
+    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, !_context->isStrict);
+    Node::accept(ast->statement, this);
+
+    return false;
+}
+
+bool ScanFunctions::visit(ForEachStatement *ast) {
+    Node::accept(ast->initialiser, this);
+    Node::accept(ast->expression, this);
+
+    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, !_context->isStrict);
+    Node::accept(ast->statement, this);
+
+    return false;
+}
+
+bool ScanFunctions::visit(LocalForEachStatement *ast) {
+    Node::accept(ast->declaration, this);
+    Node::accept(ast->expression, this);
+
+    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, !_context->isStrict);
+    Node::accept(ast->statement, this);
+
+    return false;
+}
+
+bool ScanFunctions::visit(ThisExpression *)
+{
+    _context->usesThis = true;
+    return false;
+}
+
+bool ScanFunctions::visit(Block *ast) {
+    TemporaryBoolAssignment allowFuncDecls(_allowFuncDecls, _context->isStrict ? false : _allowFuncDecls);
+    Node::accept(ast->statements, this);
+    return false;
+}
+
+void ScanFunctions::enterFunction(Node *ast, const QString &name, FormalParameterList *formals, FunctionBody *body, FunctionExpression *expr)
+{
+    if (_context) {
+        _context->hasNestedFunctions = true;
+        // The identifier of a function expression cannot be referenced from the enclosing environment.
+        if (expr)
+            _context->addLocalVar(name, Context::FunctionDefinition, AST::VariableDeclaration::FunctionScope, expr);
+        if (name == QLatin1String("arguments"))
+            _context->usesArgumentsObject = Context::ArgumentsObjectNotUsed;
+    }
+
+    enterEnvironment(ast, FunctionCode);
+    checkForArguments(formals);
+
+    if (!name.isEmpty())
+        _context->addLocalVar(name, Context::ThisFunctionName, QQmlJS::AST::VariableDeclaration::FunctionScope);
+    _context->formals = formals;
+
+    if (body && !_context->isStrict)
+        checkDirectivePrologue(body->elements);
+
+    for (FormalParameterList *it = formals; it; it = it->next) {
+        QString arg = it->name.toString();
+        int duplicateIndex = _context->arguments.indexOf(arg);
+        if (duplicateIndex != -1) {
+            if (_context->isStrict) {
+                _cg->throwSyntaxError(it->identifierToken, QStringLiteral("Duplicate parameter name '%1' is not allowed in strict mode").arg(arg));
+                return;
+            } else {
+                // change the name of the earlier argument to enforce the specified lookup semantics
+                QString modified = arg;
+                while (_context->arguments.contains(modified))
+                    modified += QString(0xfffe);
+                _context->arguments[duplicateIndex] = modified;
+            }
+        }
+        if (_context->isStrict) {
+            if (arg == QLatin1String("eval") || arg == QLatin1String("arguments")) {
+                _cg->throwSyntaxError(it->identifierToken, QStringLiteral("'%1' cannot be used as parameter name in strict mode").arg(arg));
+                return;
+            }
+        }
+        _context->arguments += arg;
+    }
+}
+
+void ScanFunctions::calcEscapingVariables()
+{
+    Module *m = _cg->_module;
+
+    for (Context *inner : m->contextMap) {
+        for (const QString &var : qAsConst(inner->usedVariables)) {
+            Context *c = inner;
+            while (c) {
+                Context::MemberMap::const_iterator it = c->members.find(var);
+                if (it != c->members.end()) {
+                    if (c != inner)
+                        it->canEscape = true;
+                    break;
+                }
+                if (c->findArgument(var) != -1) {
+                    if (c != inner)
+                        c->argumentsCanEscape = true;
+                    break;
+                }
+                c = c->parent;
+            }
+        }
+        Context *c = inner->parent;
+        while (c) {
+            c->hasDirectEval |= inner->hasDirectEval;
+            c = c->parent;
+        }
+    }
+
+    static const bool showEscapingVars = qEnvironmentVariableIsSet("QV4_SHOW_ESCAPING_VARS");
+    if (showEscapingVars) {
+        qDebug() << "==== escaping variables ====";
+        for (Context *c : m->contextMap) {
+            qDebug() << "Context" << c->name << ":";
+            qDebug() << "    Arguments escape" << c->argumentsCanEscape;
+            for (auto it = c->members.constBegin(); it != c->members.constEnd(); ++it) {
+                qDebug() << "    " << it.key() << it.value().canEscape;
+            }
+        }
+    }
+}
diff --git a/src/qml/compiler/qv4compilerscanfunctions_p.h b/src/qml/compiler/qv4compilerscanfunctions_p.h
new file mode 100644
index 0000000000..0b898e587d
--- /dev/null
+++ b/src/qml/compiler/qv4compilerscanfunctions_p.h
@@ -0,0 +1,160 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QV4COMPILERSCANFUNCTIONS_P_H
+#define QV4COMPILERSCANFUNCTIONS_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "private/qv4global_p.h"
+#include <private/qqmljsastvisitor_p.h>
+#include <private/qqmljsast_p.h>
+#include <private/qqmljsengine_p.h>
+#include <private/qv4compilercontext_p.h>
+#include <private/qv4util_p.h>
+#include <QtCore/QStringList>
+#include <QStack>
+
+QT_BEGIN_NAMESPACE
+
+using namespace QQmlJS;
+
+namespace QV4 {
+
+namespace Moth {
+struct Instruction;
+}
+
+namespace CompiledData {
+struct CompilationUnit;
+}
+
+namespace Compiler {
+
+class Codegen;
+
+class ScanFunctions: protected QQmlJS::AST::Visitor
+{
+    typedef QV4::TemporaryAssignment<bool> TemporaryBoolAssignment;
+public:
+    ScanFunctions(Codegen *cg, const QString &sourceCode, CompilationMode defaultProgramMode);
+    void operator()(AST::Node *node);
+
+    void enterEnvironment(AST::Node *node, CompilationMode compilationMode);
+    void leaveEnvironment();
+
+    void enterQmlScope(AST::Node *ast, const QString &name)
+    { enterFunction(ast, name, /*formals*/0, /*body*/0, /*expr*/0); }
+
+    void enterQmlFunction(AST::FunctionDeclaration *ast)
+    { enterFunction(ast, false); }
+
+protected:
+    using Visitor::visit;
+    using Visitor::endVisit;
+
+    void checkDirectivePrologue(AST::SourceElements *ast);
+
+    void checkName(const QStringRef &name, const AST::SourceLocation &loc);
+    void checkForArguments(AST::FormalParameterList *parameters);
+
+    bool visit(AST::Program *ast) override;
+    void endVisit(AST::Program *) override;
+
+    bool visit(AST::CallExpression *ast) override;
+    bool visit(AST::NewMemberExpression *ast) override;
+    bool visit(AST::ArrayLiteral *ast) override;
+    bool visit(AST::VariableDeclaration *ast) override;
+    bool visit(AST::IdentifierExpression *ast) override;
+    bool visit(AST::ExpressionStatement *ast) override;
+    bool visit(AST::FunctionExpression *ast) override;
+
+    void enterFunction(AST::FunctionExpression *ast, bool enterName);
+
+    void endVisit(AST::FunctionExpression *) override;
+
+    bool visit(AST::ObjectLiteral *ast) override;
+
+    bool visit(AST::PropertyGetterSetter *ast) override;
+    void endVisit(AST::PropertyGetterSetter *) override;
+
+    bool visit(AST::FunctionDeclaration *ast) override;
+    void endVisit(AST::FunctionDeclaration *) override;
+
+    bool visit(AST::TryStatement *ast) override;
+    bool visit(AST::WithStatement *ast) override;
+
+    bool visit(AST::DoWhileStatement *ast) override;
+    bool visit(AST::ForStatement *ast) override;
+    bool visit(AST::LocalForStatement *ast) override;
+    bool visit(AST::ForEachStatement *ast) override;
+    bool visit(AST::LocalForEachStatement *ast) override;
+    bool visit(AST::ThisExpression *ast) override;
+
+    bool visit(AST::Block *ast) override;
+
+protected:
+    void enterFunction(AST::Node *ast, const QString &name, AST::FormalParameterList *formals, AST::FunctionBody *body, AST::FunctionExpression *expr);
+
+    void calcEscapingVariables();
+// fields:
+    Codegen *_cg;
+    const QString _sourceCode;
+    Context *_context;
+    QStack<Context *> _contextStack;
+
+    bool _allowFuncDecls;
+    CompilationMode defaultProgramMode;
+};
+
+}
+
+}
+
+QT_END_NAMESPACE
+
+#endif // QV4CODEGEN_P_H
diff --git a/src/qml/compiler/qv4instr_moth.cpp b/src/qml/compiler/qv4instr_moth.cpp
index cf8cf623bc..9cfde99e6b 100644
--- a/src/qml/compiler/qv4instr_moth.cpp
+++ b/src/qml/compiler/qv4instr_moth.cpp
@@ -38,17 +38,603 @@
 ****************************************************************************/
 
 #include "qv4instr_moth_p.h"
+#include <private/qv4compileddata_p.h>
 
 using namespace QV4;
 using namespace QV4::Moth;
 
-int Instr::size(Type type)
+int InstrInfo::size(Instr::Type type)
 {
-#define MOTH_RETURN_INSTR_SIZE(I, FMT) case I: return InstrMeta<(int)I>::Size;
+#define MOTH_RETURN_INSTR_SIZE(I) case Instr::Type::I: return InstrMeta<int(Instr::Type::I)>::Size;
     switch (type) {
     FOR_EACH_MOTH_INSTR(MOTH_RETURN_INSTR_SIZE)
-    default: return 0;
     }
 #undef MOTH_RETURN_INSTR_SIZE
+    Q_UNREACHABLE();
 }
 
+static QByteArray alignedNumber(int n) {
+    QByteArray number = QByteArray::number(n);
+    while (number.size() < 8)
+        number.prepend(' ');
+    return number;
+}
+
+static QByteArray alignedLineNumber(int line) {
+    if (line > 0)
+        return alignedNumber(static_cast<int>(line));
+    return QByteArray("        ");
+}
+
+static QByteArray rawBytes(const char *data, int n)
+{
+    QByteArray ba;
+    while (n) {
+        uint num = *reinterpret_cast<const uchar *>(data);
+        if (num < 16)
+            ba += '0';
+        ba += QByteArray::number(num, 16) + " ";
+        ++data;
+        --n;
+    }
+    while (ba.size() < 25)
+        ba += ' ';
+    return ba;
+}
+
+static QString toString(QV4::ReturnedValue v)
+{
+#ifdef V4_BOOTSTRAP
+    return QStringLiteral("string-const(%1)").arg(v);
+#else // !V4_BOOTSTRAP
+    Value val = Value::fromReturnedValue(v);
+    QString result;
+    if (val.isInt32())
+        result = QLatin1String("int ");
+    else if (val.isDouble())
+        result = QLatin1String("double ");
+    if (val.isEmpty())
+        result += QLatin1String("empty");
+    else
+        result += val.toQStringNoThrow();
+    return result;
+#endif // V4_BOOTSTRAP
+}
+
+#define ABSOLUTE_OFFSET() \
+    (code - start + offset)
+
+#define MOTH_BEGIN_INSTR(instr) \
+    { \
+        INSTR_##instr(MOTH_DECODE_WITH_BASE) \
+        QDebug d = qDebug(); \
+        d.noquote(); \
+        d.nospace(); \
+        d << alignedLineNumber(line) << alignedNumber(codeOffset).constData() << ": " \
+          << rawBytes(base_ptr, int(code - base_ptr)) << #instr << " ";
+
+#define MOTH_END_INSTR(instr) \
+        continue; \
+    }
+
+QT_BEGIN_NAMESPACE
+namespace QV4 {
+namespace Moth {
+
+const int InstrInfo::argumentCount[] = {
+    FOR_EACH_MOTH_INSTR(MOTH_COLLECT_NARGS)
+};
+
+
+void dumpConstantTable(const Value *constants, uint count)
+{
+    QDebug d = qDebug();
+    d.nospace();
+    for (uint i = 0; i < count; ++i)
+        d << alignedNumber(int(i)).constData() << ":    "
+          << toString(constants[i].asReturnedValue()).toUtf8().constData() << "\n";
+}
+
+QString dumpRegister(int reg, int nFormals)
+{
+    Q_STATIC_ASSERT(offsetof(CallData, function) == 0);
+    Q_STATIC_ASSERT(offsetof(CallData, context) == sizeof(Value));
+    Q_STATIC_ASSERT(offsetof(CallData, accumulator) == 2*sizeof(Value));
+    Q_STATIC_ASSERT(offsetof(CallData, thisObject) == 3*sizeof(Value));
+    if (reg == CallData::Function)
+        return QStringLiteral("(function)");
+    else if (reg == CallData::Context)
+        return QStringLiteral("(context)");
+    else if (reg == CallData::Accumulator)
+        return QStringLiteral("(accumulator)");
+    else if (reg == CallData::This)
+        return QStringLiteral("(this)");
+    else if (reg == CallData::Argc)
+        return QStringLiteral("(argc)");
+    reg -= 4;
+    if (reg <= nFormals)
+        return QStringLiteral("a%1").arg(reg);
+    reg -= nFormals;
+    return QStringLiteral("r%1").arg(reg);
+
+}
+
+QString dumpArguments(int argc, int argv, int nFormals)
+{
+    if (!argc)
+        return QStringLiteral("()");
+    return QStringLiteral("(") + dumpRegister(argv, nFormals) + QStringLiteral(", ") + QString::number(argc) + QStringLiteral(")");
+}
+
+
+void dumpBytecode(const char *code, int len, int nLocals, int nFormals, int /*startLine*/, const QVector<CompiledData::CodeOffsetToLine> &lineNumberMapping)
+{
+    MOTH_JUMP_TABLE;
+
+    auto findLine = [](const CompiledData::CodeOffsetToLine &entry, uint offset) {
+        return entry.codeOffset < offset;
+    };
+
+    int lastLine = -1;
+    const char *start = code;
+    const char *end = code + len;
+    while (code < end) {
+        const CompiledData::CodeOffsetToLine *codeToLine = std::lower_bound(lineNumberMapping.constBegin(), lineNumberMapping.constEnd(), static_cast<uint>(code - start) + 1, findLine) - 1;
+        int line = int(codeToLine->line);
+        if (line != lastLine)
+            lastLine = line;
+        else
+            line = -1;
+
+        int codeOffset = int(code - start);
+
+        MOTH_DISPATCH()
+
+        MOTH_BEGIN_INSTR(LoadReg)
+            d << dumpRegister(reg, nFormals);
+        MOTH_END_INSTR(LoadReg)
+
+        MOTH_BEGIN_INSTR(StoreReg)
+            d << dumpRegister(reg, nFormals);
+        MOTH_END_INSTR(StoreReg)
+
+        MOTH_BEGIN_INSTR(MoveReg)
+            d << dumpRegister(destReg, nFormals) << ", " << dumpRegister(srcReg, nFormals);
+        MOTH_END_INSTR(MoveReg)
+
+        MOTH_BEGIN_INSTR(LoadConst)
+            d << "C" << index;
+        MOTH_END_INSTR(LoadConst)
+
+        MOTH_BEGIN_INSTR(LoadNull)
+        MOTH_END_INSTR(LoadNull)
+
+        MOTH_BEGIN_INSTR(LoadZero)
+        MOTH_END_INSTR(LoadZero)
+
+        MOTH_BEGIN_INSTR(LoadTrue)
+        MOTH_END_INSTR(LoadTrue)
+
+        MOTH_BEGIN_INSTR(LoadFalse)
+        MOTH_END_INSTR(LoadFalse)
+
+        MOTH_BEGIN_INSTR(LoadUndefined)
+        MOTH_END_INSTR(LoadUndefined)
+
+        MOTH_BEGIN_INSTR(LoadInt)
+            d << value;
+        MOTH_END_INSTR(LoadInt)
+
+        MOTH_BEGIN_INSTR(MoveConst)
+            d << dumpRegister(destTemp, nFormals) << ", C" << constIndex;
+        MOTH_END_INSTR(MoveConst)
+
+        MOTH_BEGIN_INSTR(LoadLocal)
+            if (index < nLocals)
+                d << "l" << index;
+            else
+                d << "a" << (index - nLocals);
+        MOTH_END_INSTR(LoadLocal)
+
+        MOTH_BEGIN_INSTR(StoreLocal)
+            if (index < nLocals)
+                d << "l" << index;
+            else
+                d << "a" << (index - nLocals);
+        MOTH_END_INSTR(StoreLocal)
+
+        MOTH_BEGIN_INSTR(LoadScopedLocal)
+            if (index < nLocals)
+                d << "l" << index << "@" << scope;
+            else
+                d << "a" << (index - nLocals) << "@" << scope;
+        MOTH_END_INSTR(LoadScopedLocal)
+
+        MOTH_BEGIN_INSTR(StoreScopedLocal)
+            if (index < nLocals)
+                d << ", " << "l" << index << "@" << scope;
+            else
+                d << ", " << "a" << (index - nLocals) << "@" << scope;
+        MOTH_END_INSTR(StoreScopedLocal)
+
+        MOTH_BEGIN_INSTR(LoadRuntimeString)
+            d << stringId;
+        MOTH_END_INSTR(LoadRuntimeString)
+
+        MOTH_BEGIN_INSTR(LoadRegExp)
+            d << regExpId;
+        MOTH_END_INSTR(LoadRegExp)
+
+        MOTH_BEGIN_INSTR(LoadClosure)
+            d << value;
+        MOTH_END_INSTR(LoadClosure)
+
+        MOTH_BEGIN_INSTR(LoadName)
+            d << name;
+        MOTH_END_INSTR(LoadName)
+
+        MOTH_BEGIN_INSTR(LoadGlobalLookup)
+            d << index;
+        MOTH_END_INSTR(LoadGlobalLookup)
+
+        MOTH_BEGIN_INSTR(StoreNameSloppy)
+            d << name;
+        MOTH_END_INSTR(StoreNameSloppy)
+
+        MOTH_BEGIN_INSTR(StoreNameStrict)
+            d << name;
+        MOTH_END_INSTR(StoreNameStrict)
+
+        MOTH_BEGIN_INSTR(LoadElement)
+            d << dumpRegister(base, nFormals) << "[" << dumpRegister(index, nFormals) << "]";
+        MOTH_END_INSTR(LoadElement)
+
+        MOTH_BEGIN_INSTR(LoadElementA)
+            d << dumpRegister(base, nFormals) << "[acc]";
+        MOTH_END_INSTR(LoadElement)
+
+        MOTH_BEGIN_INSTR(StoreElement)
+            d << dumpRegister(base, nFormals) << "[" << dumpRegister(index, nFormals) << "]";
+        MOTH_END_INSTR(StoreElement)
+
+        MOTH_BEGIN_INSTR(LoadProperty)
+            d << dumpRegister(base, nFormals) << "[" << name << "]";
+        MOTH_END_INSTR(LoadProperty)
+
+        MOTH_BEGIN_INSTR(LoadPropertyA)
+            d << "acc[" << name << "]";
+        MOTH_END_INSTR(LoadElementA)
+
+        MOTH_BEGIN_INSTR(GetLookup)
+            d << dumpRegister(base, nFormals) << "(" << index << ")";
+        MOTH_END_INSTR(GetLookup)
+
+        MOTH_BEGIN_INSTR(GetLookupA)
+            d << "acc(" << index << ")";
+        MOTH_END_INSTR(GetLookupA)
+
+        MOTH_BEGIN_INSTR(StoreProperty)
+            d << dumpRegister(base, nFormals) << "[" << name<< "]";
+        MOTH_END_INSTR(StoreProperty)
+
+        MOTH_BEGIN_INSTR(SetLookup)
+            d << dumpRegister(base, nFormals) << "(" << index << ")";
+        MOTH_END_INSTR(SetLookup)
+
+        MOTH_BEGIN_INSTR(StoreScopeObjectProperty)
+            d << dumpRegister(base, nFormals) << "[" << propertyIndex << "]";
+        MOTH_END_INSTR(StoreScopeObjectProperty)
+
+        MOTH_BEGIN_INSTR(LoadScopeObjectProperty)
+            d << dumpRegister(base, nFormals) << "[" << propertyIndex << "]" << (captureRequired ? " (capture)" : " (no capture)");
+        MOTH_END_INSTR(LoadScopeObjectProperty)
+
+        MOTH_BEGIN_INSTR(StoreContextObjectProperty)
+            d << dumpRegister(base, nFormals) << "[" << propertyIndex << "]";
+        MOTH_END_INSTR(StoreContextObjectProperty)
+
+        MOTH_BEGIN_INSTR(LoadContextObjectProperty)
+            d << dumpRegister(base, nFormals) << "[" << propertyIndex << "]" << (captureRequired ? " (capture)" : " (no capture)");
+        MOTH_END_INSTR(LoadContextObjectProperty)
+
+        MOTH_BEGIN_INSTR(LoadIdObject)
+            d << dumpRegister(base, nFormals) << "[" << index << "]";
+        MOTH_END_INSTR(LoadIdObject)
+
+        MOTH_BEGIN_INSTR(CallValue)
+            d << dumpArguments(argc, argv, nFormals);
+        MOTH_END_INSTR(CallValue)
+
+        MOTH_BEGIN_INSTR(CallProperty)
+            d << dumpRegister(base, nFormals) << "." << name << dumpArguments(argc, argv, nFormals);
+        MOTH_END_INSTR(CallProperty)
+
+        MOTH_BEGIN_INSTR(CallPropertyLookup)
+            d << dumpRegister(base, nFormals) << "." << lookupIndex << dumpArguments(argc, argv, nFormals);
+        MOTH_END_INSTR(CallPropertyLookup)
+
+        MOTH_BEGIN_INSTR(CallElement)
+            d << dumpRegister(base, nFormals) << "[" << dumpRegister(index, nFormals) << "]" << dumpArguments(argc, argv, nFormals);
+        MOTH_END_INSTR(CallElement)
+
+        MOTH_BEGIN_INSTR(CallName)
+            d << name << dumpArguments(argc, argv, nFormals);
+        MOTH_END_INSTR(CallName)
+
+        MOTH_BEGIN_INSTR(CallPossiblyDirectEval)
+            d << dumpArguments(argc, argv, nFormals);
+        MOTH_END_INSTR(CallPossiblyDirectEval)
+
+        MOTH_BEGIN_INSTR(CallGlobalLookup)
+            d << index << dumpArguments(argc, argv, nFormals);
+        MOTH_END_INSTR(CallGlobalLookup)
+
+        MOTH_BEGIN_INSTR(SetExceptionHandler)
+            if (offset)
+                d << ABSOLUTE_OFFSET();
+            else
+                d << "<null>";
+        MOTH_END_INSTR(SetExceptionHandler)
+
+        MOTH_BEGIN_INSTR(ThrowException)
+        MOTH_END_INSTR(ThrowException)
+
+        MOTH_BEGIN_INSTR(GetException)
+        MOTH_END_INSTR(HasException)
+
+        MOTH_BEGIN_INSTR(SetException)
+        MOTH_END_INSTR(SetExceptionFlag)
+
+        MOTH_BEGIN_INSTR(CreateCallContext)
+        MOTH_END_INSTR(CreateCallContext)
+
+        MOTH_BEGIN_INSTR(PushCatchContext)
+            d << dumpRegister(reg, nFormals) << ", " << name;
+        MOTH_END_INSTR(PushCatchContext)
+
+        MOTH_BEGIN_INSTR(PushWithContext)
+            d << dumpRegister(reg, nFormals);
+        MOTH_END_INSTR(PushWithContext)
+
+        MOTH_BEGIN_INSTR(PopContext)
+            d << dumpRegister(reg, nFormals);
+        MOTH_END_INSTR(PopContext)
+
+        MOTH_BEGIN_INSTR(ForeachIteratorObject)
+        MOTH_END_INSTR(ForeachIteratorObject)
+
+        MOTH_BEGIN_INSTR(ForeachNextPropertyName)
+        MOTH_END_INSTR(ForeachNextPropertyName)
+
+        MOTH_BEGIN_INSTR(DeleteMember)
+            d << dumpRegister(base, nFormals) << "[" << member << "]";
+        MOTH_END_INSTR(DeleteMember)
+
+        MOTH_BEGIN_INSTR(DeleteSubscript)
+            d << dumpRegister(base, nFormals) << "[" << dumpRegister(index, nFormals) << "]";
+        MOTH_END_INSTR(DeleteSubscript)
+
+        MOTH_BEGIN_INSTR(DeleteName)
+            d << name;
+        MOTH_END_INSTR(DeleteName)
+
+        MOTH_BEGIN_INSTR(TypeofName)
+            d << name;
+        MOTH_END_INSTR(TypeofName)
+
+        MOTH_BEGIN_INSTR(TypeofValue)
+        MOTH_END_INSTR(TypeofValue)
+
+        MOTH_BEGIN_INSTR(DeclareVar)
+            d << isDeletable << ", " << varName;
+        MOTH_END_INSTR(DeclareVar)
+
+        MOTH_BEGIN_INSTR(DefineArray)
+            d << dumpRegister(args, nFormals) << ", " << argc;
+        MOTH_END_INSTR(DefineArray)
+
+        MOTH_BEGIN_INSTR(DefineObjectLiteral)
+            d << dumpRegister(args, nFormals)
+              << ", " << internalClassId
+              << ", " << arrayValueCount
+              << ", " << arrayGetterSetterCountAndFlags;
+        MOTH_END_INSTR(DefineObjectLiteral)
+
+        MOTH_BEGIN_INSTR(CreateMappedArgumentsObject)
+        MOTH_END_INSTR(CreateMappedArgumentsObject)
+
+        MOTH_BEGIN_INSTR(CreateUnmappedArgumentsObject)
+        MOTH_END_INSTR(CreateUnmappedArgumentsObject)
+
+        MOTH_BEGIN_INSTR(ConvertThisToObject)
+        MOTH_END_INSTR(ConvertThisToObject)
+
+        MOTH_BEGIN_INSTR(Construct)
+            d << "new" << dumpRegister(func, nFormals) << dumpArguments(argc, argv, nFormals);
+        MOTH_END_INSTR(Construct)
+
+        MOTH_BEGIN_INSTR(Jump)
+            d << ABSOLUTE_OFFSET();
+        MOTH_END_INSTR(Jump)
+
+        MOTH_BEGIN_INSTR(JumpTrue)
+            d << ABSOLUTE_OFFSET();
+        MOTH_END_INSTR(JumpTrue)
+
+        MOTH_BEGIN_INSTR(JumpFalse)
+            d << ABSOLUTE_OFFSET();
+        MOTH_END_INSTR(JumpFalse)
+
+        MOTH_BEGIN_INSTR(CmpEqNull)
+        MOTH_END_INSTR(CmpEqNull)
+
+        MOTH_BEGIN_INSTR(CmpNeNull)
+        MOTH_END_INSTR(CmpNeNull)
+
+        MOTH_BEGIN_INSTR(CmpEqInt)
+            d << lhs;
+        MOTH_END_INSTR(CmpEq)
+
+        MOTH_BEGIN_INSTR(CmpNeInt)
+                d << lhs;
+        MOTH_END_INSTR(CmpNeInt)
+
+        MOTH_BEGIN_INSTR(CmpEq)
+            d << dumpRegister(lhs, nFormals);
+        MOTH_END_INSTR(CmpEq)
+
+        MOTH_BEGIN_INSTR(CmpNe)
+                d << dumpRegister(lhs, nFormals);
+        MOTH_END_INSTR(CmpNe)
+
+        MOTH_BEGIN_INSTR(CmpGt)
+                d << dumpRegister(lhs, nFormals);
+        MOTH_END_INSTR(CmpGt)
+
+        MOTH_BEGIN_INSTR(CmpGe)
+                d << dumpRegister(lhs, nFormals);
+        MOTH_END_INSTR(CmpGe)
+
+        MOTH_BEGIN_INSTR(CmpLt)
+                d << dumpRegister(lhs, nFormals);
+        MOTH_END_INSTR(CmpLt)
+
+        MOTH_BEGIN_INSTR(CmpLe)
+                d << dumpRegister(lhs, nFormals);
+        MOTH_END_INSTR(CmpLe)
+
+        MOTH_BEGIN_INSTR(CmpStrictEqual)
+            d << dumpRegister(lhs, nFormals);
+        MOTH_END_INSTR(CmpStrictEqual)
+
+        MOTH_BEGIN_INSTR(CmpStrictNotEqual)
+            d << dumpRegister(lhs, nFormals);
+        MOTH_END_INSTR(CmpStrictNotEqual)
+
+        MOTH_BEGIN_INSTR(JumpStrictEqualStackSlotInt)
+            d << dumpRegister(lhs, nFormals) << ", " << rhs << "  " << ABSOLUTE_OFFSET();
+        MOTH_END_INSTR(JumpStrictEqualStackSlotInt)
+
+        MOTH_BEGIN_INSTR(JumpStrictNotEqualStackSlotInt)
+            d << dumpRegister(lhs, nFormals) << ", " << rhs << "  " << ABSOLUTE_OFFSET();
+        MOTH_END_INSTR(JumpStrictNotEqualStackSlotInt)
+
+        MOTH_BEGIN_INSTR(UNot)
+        MOTH_END_INSTR(UNot)
+
+        MOTH_BEGIN_INSTR(UPlus)
+        MOTH_END_INSTR(UPlus)
+
+        MOTH_BEGIN_INSTR(UMinus)
+        MOTH_END_INSTR(UMinus)
+
+        MOTH_BEGIN_INSTR(UCompl)
+        MOTH_END_INSTR(UCompl)
+
+        MOTH_BEGIN_INSTR(Increment)
+        MOTH_END_INSTR(PreIncrement)
+
+        MOTH_BEGIN_INSTR(Decrement)
+        MOTH_END_INSTR(PreDecrement)
+
+        MOTH_BEGIN_INSTR(Add)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(Add)
+
+        MOTH_BEGIN_INSTR(BitAnd)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(BitAnd)
+
+        MOTH_BEGIN_INSTR(BitOr)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(BitOr)
+
+        MOTH_BEGIN_INSTR(BitXor)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(BitXor)
+
+        MOTH_BEGIN_INSTR(UShr)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(UShr)
+
+        MOTH_BEGIN_INSTR(Shr)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(Shr)
+
+        MOTH_BEGIN_INSTR(Shl)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(Shl)
+
+        MOTH_BEGIN_INSTR(BitAndConst)
+            d << "acc, " << rhs;
+        MOTH_END_INSTR(BitAndConst)
+
+        MOTH_BEGIN_INSTR(BitOrConst)
+            d << "acc, " << rhs;
+        MOTH_END_INSTR(BitOr)
+
+        MOTH_BEGIN_INSTR(BitXorConst)
+            d << "acc, " << rhs;
+        MOTH_END_INSTR(BitXor)
+
+        MOTH_BEGIN_INSTR(UShrConst)
+            d << "acc, " << rhs;
+        MOTH_END_INSTR(UShrConst)
+
+        MOTH_BEGIN_INSTR(ShrConst)
+            d << "acc, " << rhs;
+        MOTH_END_INSTR(ShrConst)
+
+        MOTH_BEGIN_INSTR(ShlConst)
+            d << "acc, " << rhs;
+        MOTH_END_INSTR(ShlConst)
+
+        MOTH_BEGIN_INSTR(Mul)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(Mul)
+
+        MOTH_BEGIN_INSTR(Div)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(Div)
+
+        MOTH_BEGIN_INSTR(Mod)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(Mod)
+
+        MOTH_BEGIN_INSTR(Sub)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(Sub)
+
+        MOTH_BEGIN_INSTR(CmpIn)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(CmpIn)
+
+        MOTH_BEGIN_INSTR(CmpInstanceOf)
+            d << dumpRegister(lhs, nFormals) << ", acc";
+        MOTH_END_INSTR(CmpInstanceOf)
+
+        MOTH_BEGIN_INSTR(Ret)
+        MOTH_END_INSTR(Ret)
+
+#ifndef QT_NO_QML_DEBUGGER
+        MOTH_BEGIN_INSTR(Debug)
+        MOTH_END_INSTR(Debug)
+#endif // QT_NO_QML_DEBUGGER
+
+        MOTH_BEGIN_INSTR(LoadQmlContext)
+            d << dumpRegister(result, nFormals);
+        MOTH_END_INSTR(LoadQmlContext)
+
+        MOTH_BEGIN_INSTR(LoadQmlImportedScripts)
+            d << dumpRegister(result, nFormals);
+        MOTH_END_INSTR(LoadQmlImportedScripts)
+
+        MOTH_BEGIN_INSTR(LoadQmlSingleton)
+            d << name;
+        MOTH_END_INSTR(LoadQmlSingleton)
+    }
+}
+
+}
+}
+QT_END_NAMESPACE
diff --git a/src/qml/compiler/qv4instr_moth_p.h b/src/qml/compiler/qv4instr_moth_p.h
index 1bdb8df414..e0b013eb95 100644
--- a/src/qml/compiler/qv4instr_moth_p.h
+++ b/src/qml/compiler/qv4instr_moth_p.h
@@ -64,851 +64,451 @@ QT_BEGIN_NAMESPACE
 #define MOTH_DEBUG_INSTR(F)
 #else
 #define MOTH_DEBUG_INSTR(F) \
-    F(Line, line) \
-    F(Debug, debug)
+    F(Debug)
 #endif
 
+#define INSTRUCTION(op, name, nargs, ...) \
+    op##_INSTRUCTION(name, nargs, __VA_ARGS__)
+
+/* for all jump instructions, the offset has to come last, to simplify the job of the bytecode generator */
+#define INSTR_Ret(op) INSTRUCTION(op, Ret, 0)
+#define INSTR_Debug(op) INSTRUCTION(op, Debug, 0)
+#define INSTR_LoadConst(op) INSTRUCTION(op, LoadConst, 1, index)
+#define INSTR_LoadZero(op) INSTRUCTION(op, LoadZero, 0)
+#define INSTR_LoadTrue(op) INSTRUCTION(op, LoadTrue, 0)
+#define INSTR_LoadFalse(op) INSTRUCTION(op, LoadFalse, 0)
+#define INSTR_LoadNull(op) INSTRUCTION(op, LoadNull, 0)
+#define INSTR_LoadUndefined(op) INSTRUCTION(op, LoadUndefined, 0)
+#define INSTR_LoadInt(op) INSTRUCTION(op, LoadInt, 1, value)
+#define INSTR_MoveConst(op) INSTRUCTION(op, MoveConst, 2, constIndex, destTemp)
+#define INSTR_LoadReg(op) INSTRUCTION(op, LoadReg, 1, reg)
+#define INSTR_StoreReg(op) INSTRUCTION(op, StoreReg, 1, reg)
+#define INSTR_MoveReg(op) INSTRUCTION(op, MoveReg, 2, srcReg, destReg)
+#define INSTR_LoadLocal(op) INSTRUCTION(op, LoadLocal, 1, index)
+#define INSTR_StoreLocal(op) INSTRUCTION(op, StoreLocal, 1, index)
+#define INSTR_LoadScopedLocal(op) INSTRUCTION(op, LoadScopedLocal, 2, scope, index)
+#define INSTR_StoreScopedLocal(op) INSTRUCTION(op, StoreScopedLocal, 2, scope, index)
+#define INSTR_LoadRuntimeString(op) INSTRUCTION(op, LoadRuntimeString, 1, stringId)
+#define INSTR_LoadRegExp(op) INSTRUCTION(op, LoadRegExp, 1, regExpId)
+#define INSTR_LoadClosure(op) INSTRUCTION(op, LoadClosure, 1, value)
+#define INSTR_LoadName(op) INSTRUCTION(op, LoadName, 1, name)
+#define INSTR_LoadGlobalLookup(op) INSTRUCTION(op, LoadGlobalLookup, 1, index)
+#define INSTR_StoreNameSloppy(op) INSTRUCTION(op, StoreNameSloppy, 1, name)
+#define INSTR_StoreNameStrict(op) INSTRUCTION(op, StoreNameStrict, 1, name)
+#define INSTR_LoadProperty(op) INSTRUCTION(op, LoadProperty, 2, name, base)
+#define INSTR_LoadPropertyA(op) INSTRUCTION(op, LoadPropertyA, 1, name)
+#define INSTR_GetLookup(op) INSTRUCTION(op, GetLookup, 2, index, base)
+#define INSTR_GetLookupA(op) INSTRUCTION(op, GetLookupA, 1, index)
+#define INSTR_LoadScopeObjectProperty(op) INSTRUCTION(op, LoadScopeObjectProperty, 3, propertyIndex, base, captureRequired)
+#define INSTR_LoadContextObjectProperty(op) INSTRUCTION(op, LoadContextObjectProperty, 3, propertyIndex, base, captureRequired)
+#define INSTR_LoadIdObject(op) INSTRUCTION(op, LoadIdObject, 2, index, base)
+#define INSTR_StoreProperty(op) INSTRUCTION(op, StoreProperty, 2, name, base)
+#define INSTR_SetLookup(op) INSTRUCTION(op, SetLookup, 2, index, base)
+#define INSTR_StoreScopeObjectProperty(op) INSTRUCTION(op, StoreScopeObjectProperty, 2, base, propertyIndex)
+#define INSTR_StoreContextObjectProperty(op) INSTRUCTION(op, StoreContextObjectProperty, 2, base, propertyIndex)
+#define INSTR_LoadElement(op) INSTRUCTION(op, LoadElement, 2, base, index)
+#define INSTR_LoadElementA(op) INSTRUCTION(op, LoadElementA, 1, base)
+#define INSTR_StoreElement(op) INSTRUCTION(op, StoreElement, 2, base, index)
+#define INSTR_CallValue(op) INSTRUCTION(op, CallValue, 2, argc, argv)
+#define INSTR_CallProperty(op) INSTRUCTION(op, CallProperty, 4, name, base, argc, argv)
+#define INSTR_CallPropertyLookup(op) INSTRUCTION(op, CallPropertyLookup, 4, lookupIndex, base, argc, argv)
+#define INSTR_CallElement(op) INSTRUCTION(op, CallElement, 4, base, index, argc, argv)
+#define INSTR_CallName(op) INSTRUCTION(op, CallName, 3, name, argc, argv)
+#define INSTR_CallPossiblyDirectEval(op) INSTRUCTION(op, CallPossiblyDirectEval, 2, argc, argv)
+#define INSTR_CallGlobalLookup(op) INSTRUCTION(op, CallGlobalLookup, 3, index, argc, argv)
+#define INSTR_SetExceptionHandler(op) INSTRUCTION(op, SetExceptionHandler, 1, offset)
+#define INSTR_ThrowException(op) INSTRUCTION(op, ThrowException, 0)
+#define INSTR_GetException(op) INSTRUCTION(op, GetException, 0)
+#define INSTR_SetException(op) INSTRUCTION(op, SetException, 0)
+#define INSTR_CreateCallContext(op) INSTRUCTION(op, CreateCallContext, 0)
+#define INSTR_PushCatchContext(op) INSTRUCTION(op, PushCatchContext, 2, name, reg)
+#define INSTR_PushWithContext(op) INSTRUCTION(op, PushWithContext, 1, reg)
+#define INSTR_PopContext(op) INSTRUCTION(op, PopContext, 1, reg)
+#define INSTR_ForeachIteratorObject(op) INSTRUCTION(op, ForeachIteratorObject, 0)
+#define INSTR_ForeachNextPropertyName(op) INSTRUCTION(op, ForeachNextPropertyName, 0)
+#define INSTR_DeleteMember(op) INSTRUCTION(op, DeleteMember, 2, member, base)
+#define INSTR_DeleteSubscript(op) INSTRUCTION(op, DeleteSubscript, 2, base, index)
+#define INSTR_DeleteName(op) INSTRUCTION(op, DeleteName, 1, name)
+#define INSTR_TypeofName(op) INSTRUCTION(op, TypeofName, 1, name)
+#define INSTR_TypeofValue(op) INSTRUCTION(op, TypeofValue, 0)
+#define INSTR_DeclareVar(op) INSTRUCTION(op, DeclareVar, 2, varName, isDeletable)
+#define INSTR_DefineArray(op) INSTRUCTION(op, DefineArray, 2, argc, args)
+// arrayGetterSetterCountAndFlags contains 30 bits for count, 1 bit for needsSparseArray boolean
+#define INSTR_DefineObjectLiteral(op) INSTRUCTION(op, DefineObjectLiteral, 4, internalClassId, arrayValueCount, arrayGetterSetterCountAndFlags, args)
+#define INSTR_CreateMappedArgumentsObject(op) INSTRUCTION(op, CreateMappedArgumentsObject, 0)
+#define INSTR_CreateUnmappedArgumentsObject(op) INSTRUCTION(op, CreateUnmappedArgumentsObject, 0)
+#define INSTR_ConvertThisToObject(op) INSTRUCTION(op, ConvertThisToObject, 0)
+#define INSTR_Construct(op) INSTRUCTION(op, Construct, 3, func, argc, argv)
+#define INSTR_Jump(op) INSTRUCTION(op, Jump, 1, offset)
+#define INSTR_JumpTrue(op) INSTRUCTION(op, JumpTrue, 1, offset)
+#define INSTR_JumpFalse(op) INSTRUCTION(op, JumpFalse, 1, offset)
+#define INSTR_CmpEqNull(op) INSTRUCTION(op, CmpEqNull, 0)
+#define INSTR_CmpNeNull(op) INSTRUCTION(op, CmpNeNull, 0)
+#define INSTR_CmpEqInt(op) INSTRUCTION(op, CmpEqInt, 1, lhs)
+#define INSTR_CmpNeInt(op) INSTRUCTION(op, CmpNeInt, 1, lhs)
+#define INSTR_CmpEq(op) INSTRUCTION(op, CmpEq, 1, lhs)
+#define INSTR_CmpNe(op) INSTRUCTION(op, CmpNe, 1, lhs)
+#define INSTR_CmpGt(op) INSTRUCTION(op, CmpGt, 1, lhs)
+#define INSTR_CmpGe(op) INSTRUCTION(op, CmpGe, 1, lhs)
+#define INSTR_CmpLt(op) INSTRUCTION(op, CmpLt, 1, lhs)
+#define INSTR_CmpLe(op) INSTRUCTION(op, CmpLe, 1, lhs)
+#define INSTR_CmpStrictEqual(op) INSTRUCTION(op, CmpStrictEqual, 1, lhs)
+#define INSTR_CmpStrictNotEqual(op) INSTRUCTION(op, CmpStrictNotEqual, 1, lhs)
+#define INSTR_CmpIn(op) INSTRUCTION(op, CmpIn, 1, lhs)
+#define INSTR_CmpInstanceOf(op) INSTRUCTION(op, CmpInstanceOf, 1, lhs)
+#define INSTR_JumpStrictEqualStackSlotInt(op) INSTRUCTION(op, JumpStrictEqualStackSlotInt, 3, lhs, rhs, offset)
+#define INSTR_JumpStrictNotEqualStackSlotInt(op) INSTRUCTION(op, JumpStrictNotEqualStackSlotInt, 3, lhs, rhs, offset)
+#define INSTR_UNot(op) INSTRUCTION(op, UNot, 0)
+#define INSTR_UPlus(op) INSTRUCTION(op, UPlus, 0)
+#define INSTR_UMinus(op) INSTRUCTION(op, UMinus, 0)
+#define INSTR_UCompl(op) INSTRUCTION(op, UCompl, 0)
+#define INSTR_Increment(op) INSTRUCTION(op, Increment, 0)
+#define INSTR_Decrement(op) INSTRUCTION(op, Decrement, 0)
+#define INSTR_Add(op) INSTRUCTION(op, Add, 1, lhs)
+#define INSTR_BitAnd(op) INSTRUCTION(op, BitAnd, 1, lhs)
+#define INSTR_BitOr(op) INSTRUCTION(op, BitOr, 1, lhs)
+#define INSTR_BitXor(op) INSTRUCTION(op, BitXor, 1, lhs)
+#define INSTR_UShr(op) INSTRUCTION(op, UShr, 1, lhs)
+#define INSTR_Shr(op) INSTRUCTION(op, Shr, 1, lhs)
+#define INSTR_Shl(op) INSTRUCTION(op, Shl, 1, lhs)
+#define INSTR_BitAndConst(op) INSTRUCTION(op, BitAndConst, 1, rhs)
+#define INSTR_BitOrConst(op) INSTRUCTION(op, BitOrConst, 1, rhs)
+#define INSTR_BitXorConst(op) INSTRUCTION(op, BitXorConst, 1, rhs)
+#define INSTR_UShrConst(op) INSTRUCTION(op, UShrConst, 1, rhs)
+#define INSTR_ShrConst(op) INSTRUCTION(op, ShrConst, 1, rhs)
+#define INSTR_ShlConst(op) INSTRUCTION(op, ShlConst, 1, rhs)
+#define INSTR_Mul(op) INSTRUCTION(op, Mul, 1, lhs)
+#define INSTR_Div(op) INSTRUCTION(op, Div, 1, lhs)
+#define INSTR_Mod(op) INSTRUCTION(op, Mod, 1, lhs)
+#define INSTR_Sub(op) INSTRUCTION(op, Sub, 1, lhs)
+#define INSTR_LoadQmlContext(op) INSTRUCTION(op, LoadQmlContext, 1, result)
+#define INSTR_LoadQmlImportedScripts(op) INSTRUCTION(op, LoadQmlImportedScripts, 1, result)
+#define INSTR_LoadQmlSingleton(op) INSTRUCTION(op, LoadQmlSingleton, 1, name)
+
+
 #define FOR_EACH_MOTH_INSTR(F) \
-    F(Ret, ret) \
-    MOTH_DEBUG_INSTR(F) \
-    F(LoadRuntimeString, loadRuntimeString) \
-    F(LoadRegExp, loadRegExp) \
-    F(LoadClosure, loadClosure) \
-    F(Move, move) \
-    F(MoveConst, moveConst) \
-    F(SwapTemps, swapTemps) \
-    F(LoadName, loadName) \
-    F(GetGlobalLookup, getGlobalLookup) \
-    F(StoreName, storeName) \
-    F(LoadElement, loadElement) \
-    F(LoadElementLookup, loadElementLookup) \
-    F(StoreElement, storeElement) \
-    F(StoreElementLookup, storeElementLookup) \
-    F(LoadProperty, loadProperty) \
-    F(GetLookup, getLookup) \
-    F(StoreProperty, storeProperty) \
-    F(SetLookup, setLookup) \
-    F(StoreQObjectProperty, storeQObjectProperty) \
-    F(LoadQObjectProperty, loadQObjectProperty) \
-    F(StoreScopeObjectProperty, storeScopeObjectProperty) \
-    F(StoreContextObjectProperty, storeContextObjectProperty) \
-    F(LoadScopeObjectProperty, loadScopeObjectProperty) \
-    F(LoadContextObjectProperty, loadContextObjectProperty) \
-    F(LoadIdObject, loadIdObject) \
-    F(LoadAttachedQObjectProperty, loadAttachedQObjectProperty) \
-    F(LoadSingletonQObjectProperty, loadQObjectProperty) \
-    F(Push, push) \
-    F(CallValue, callValue) \
-    F(CallProperty, callProperty) \
-    F(CallPropertyLookup, callPropertyLookup) \
-    F(CallScopeObjectProperty, callScopeObjectProperty) \
-    F(CallContextObjectProperty, callContextObjectProperty) \
-    F(CallElement, callElement) \
-    F(CallActivationProperty, callActivationProperty) \
-    F(CallGlobalLookup, callGlobalLookup) \
-    F(SetExceptionHandler, setExceptionHandler) \
-    F(CallBuiltinThrow, callBuiltinThrow) \
-    F(CallBuiltinUnwindException, callBuiltinUnwindException) \
-    F(CallBuiltinPushCatchScope, callBuiltinPushCatchScope) \
-    F(CallBuiltinPushScope, callBuiltinPushScope) \
-    F(CallBuiltinPopScope, callBuiltinPopScope) \
-    F(CallBuiltinForeachIteratorObject, callBuiltinForeachIteratorObject) \
-    F(CallBuiltinForeachNextPropertyName, callBuiltinForeachNextPropertyName) \
-    F(CallBuiltinDeleteMember, callBuiltinDeleteMember) \
-    F(CallBuiltinDeleteSubscript, callBuiltinDeleteSubscript) \
-    F(CallBuiltinDeleteName, callBuiltinDeleteName) \
-    F(CallBuiltinTypeofScopeObjectProperty, callBuiltinTypeofScopeObjectProperty) \
-    F(CallBuiltinTypeofContextObjectProperty, callBuiltinTypeofContextObjectProperty) \
-    F(CallBuiltinTypeofMember, callBuiltinTypeofMember) \
-    F(CallBuiltinTypeofSubscript, callBuiltinTypeofSubscript) \
-    F(CallBuiltinTypeofName, callBuiltinTypeofName) \
-    F(CallBuiltinTypeofValue, callBuiltinTypeofValue) \
-    F(CallBuiltinDeclareVar, callBuiltinDeclareVar) \
-    F(CallBuiltinDefineArray, callBuiltinDefineArray) \
-    F(CallBuiltinDefineObjectLiteral, callBuiltinDefineObjectLiteral) \
-    F(CallBuiltinSetupArgumentsObject, callBuiltinSetupArgumentsObject) \
-    F(CallBuiltinConvertThisToObject, callBuiltinConvertThisToObject) \
-    F(CreateValue, createValue) \
-    F(CreateProperty, createProperty) \
-    F(ConstructPropertyLookup, constructPropertyLookup) \
-    F(CreateActivationProperty, createActivationProperty) \
-    F(ConstructGlobalLookup, constructGlobalLookup) \
-    F(Jump, jump) \
-    F(JumpEq, jumpEq) \
-    F(JumpNe, jumpNe) \
-    F(UNot, unot) \
-    F(UNotBool, unotBool) \
-    F(UPlus, uplus) \
-    F(UMinus, uminus) \
-    F(UCompl, ucompl) \
-    F(UComplInt, ucomplInt) \
-    F(Increment, increment) \
-    F(Decrement, decrement) \
-    F(Binop, binop) \
-    F(Add, add) \
-    F(BitAnd, bitAnd) \
-    F(BitOr, bitOr) \
-    F(BitXor, bitXor) \
-    F(Shr, shr) \
-    F(Shl, shl) \
-    F(BitAndConst, bitAndConst) \
-    F(BitOrConst, bitOrConst) \
-    F(BitXorConst, bitXorConst) \
-    F(ShrConst, shrConst) \
-    F(ShlConst, shlConst) \
-    F(Mul, mul) \
-    F(Sub, sub) \
-    F(BinopContext, binopContext) \
-    F(LoadThis, loadThis) \
-    F(LoadQmlContext, loadQmlContext) \
-    F(LoadQmlImportedScripts, loadQmlImportedScripts) \
-    F(LoadQmlSingleton, loadQmlSingleton)
+    F(Ret) \
+    F(Debug) \
+    F(LoadConst) \
+    F(LoadZero) \
+    F(LoadTrue) \
+    F(LoadFalse) \
+    F(LoadNull) \
+    F(LoadUndefined) \
+    F(LoadInt) \
+    F(MoveConst) \
+    F(LoadReg) \
+    F(StoreReg) \
+    F(MoveReg) \
+    F(LoadLocal) \
+    F(StoreLocal) \
+    F(LoadScopedLocal) \
+    F(StoreScopedLocal) \
+    F(LoadRuntimeString) \
+    F(LoadRegExp) \
+    F(LoadClosure) \
+    F(LoadName) \
+    F(LoadGlobalLookup) \
+    F(StoreNameSloppy) \
+    F(StoreNameStrict) \
+    F(LoadElement) \
+    F(LoadElementA) \
+    F(StoreElement) \
+    F(LoadProperty) \
+    F(LoadPropertyA) \
+    F(GetLookup) \
+    F(GetLookupA) \
+    F(StoreProperty) \
+    F(SetLookup) \
+    F(StoreScopeObjectProperty) \
+    F(StoreContextObjectProperty) \
+    F(LoadScopeObjectProperty) \
+    F(LoadContextObjectProperty) \
+    F(LoadIdObject) \
+    F(CallValue) \
+    F(CallProperty) \
+    F(CallPropertyLookup) \
+    F(CallElement) \
+    F(CallName) \
+    F(CallPossiblyDirectEval) \
+    F(CallGlobalLookup) \
+    F(SetExceptionHandler) \
+    F(ThrowException) \
+    F(GetException) \
+    F(SetException) \
+    F(CreateCallContext) \
+    F(PushCatchContext) \
+    F(PushWithContext) \
+    F(PopContext) \
+    F(ForeachIteratorObject) \
+    F(ForeachNextPropertyName) \
+    F(DeleteMember) \
+    F(DeleteSubscript) \
+    F(DeleteName) \
+    F(TypeofName) \
+    F(TypeofValue) \
+    F(DeclareVar) \
+    F(DefineArray) \
+    F(DefineObjectLiteral) \
+    F(CreateMappedArgumentsObject) \
+    F(CreateUnmappedArgumentsObject) \
+    F(ConvertThisToObject) \
+    F(Construct) \
+    F(Jump) \
+    F(JumpTrue) \
+    F(JumpFalse) \
+    F(CmpEqNull) \
+    F(CmpNeNull) \
+    F(CmpEqInt) \
+    F(CmpNeInt) \
+    F(CmpEq) \
+    F(CmpNe) \
+    F(CmpGt) \
+    F(CmpGe) \
+    F(CmpLt) \
+    F(CmpLe) \
+    F(CmpStrictEqual) \
+    F(CmpStrictNotEqual) \
+    F(CmpIn) \
+    F(CmpInstanceOf) \
+    F(JumpStrictEqualStackSlotInt) \
+    F(JumpStrictNotEqualStackSlotInt) \
+    F(UNot) \
+    F(UPlus) \
+    F(UMinus) \
+    F(UCompl) \
+    F(Increment) \
+    F(Decrement) \
+    F(Add) \
+    F(BitAnd) \
+    F(BitOr) \
+    F(BitXor) \
+    F(UShr) \
+    F(Shr) \
+    F(Shl) \
+    F(BitAndConst) \
+    F(BitOrConst) \
+    F(BitXorConst) \
+    F(UShrConst) \
+    F(ShrConst) \
+    F(ShlConst) \
+    F(Mul) \
+    F(Div) \
+    F(Mod) \
+    F(Sub) \
+    F(LoadQmlContext) \
+    F(LoadQmlImportedScripts) \
+    F(LoadQmlSingleton)
+#define MOTH_NUM_INSTRUCTIONS() (static_cast<int>(Moth::Instr::Type::LoadQmlSingleton) + 1)
 
 #if defined(Q_CC_GNU) && (!defined(Q_CC_INTEL) || __INTEL_COMPILER >= 1200)
-#  define MOTH_THREADED_INTERPRETER
+#  define MOTH_COMPUTED_GOTO
 #endif
 
 #define MOTH_INSTR_ALIGN_MASK (Q_ALIGNOF(QV4::Moth::Instr) - 1)
 
-#define MOTH_INSTR_HEADER quint32 instructionType;
+#define MOTH_INSTR_ENUM(I)  I,
+#define MOTH_INSTR_SIZE(I) (sizeof(QV4::Moth::Instr::instr_##I))
+
+#define MOTH_EXPAND_FOR_MSVC(x) x
+#define MOTH_DEFINE_ARGS(nargs, ...) \
+    MOTH_EXPAND_FOR_MSVC(MOTH_DEFINE_ARGS##nargs(__VA_ARGS__))
+
+#define MOTH_DEFINE_ARGS0()
+#define MOTH_DEFINE_ARGS1(arg) \
+    int arg;
+#define MOTH_DEFINE_ARGS2(arg1, arg2) \
+    int arg1; \
+    int arg2;
+#define MOTH_DEFINE_ARGS3(arg1, arg2, arg3) \
+    int arg1; \
+    int arg2; \
+    int arg3;
+#define MOTH_DEFINE_ARGS4(arg1, arg2, arg3, arg4) \
+    int arg1; \
+    int arg2; \
+    int arg3; \
+    int arg4;
+
+#define MOTH_COLLECT_ENUMS(instr) \
+    INSTR_##instr(MOTH_GET_ENUM)
+#define MOTH_GET_ENUM_INSTRUCTION(name, ...) \
+    name,
+
+#define MOTH_EMIT_STRUCTS(instr) \
+    INSTR_##instr(MOTH_EMIT_STRUCT)
+#define MOTH_EMIT_STRUCT_INSTRUCTION(name, nargs, ...) \
+    struct instr_##name { \
+        MOTH_DEFINE_ARGS(nargs, __VA_ARGS__) \
+    };
+
+#define MOTH_EMIT_INSTR_MEMBERS(instr) \
+    INSTR_##instr(MOTH_EMIT_INSTR_MEMBER)
+#define MOTH_EMIT_INSTR_MEMBER_INSTRUCTION(name, nargs, ...) \
+    instr_##name name;
+
+#define MOTH_COLLECT_NARGS(instr) \
+    INSTR_##instr(MOTH_COLLECT_ARG_COUNT)
+#define MOTH_COLLECT_ARG_COUNT_INSTRUCTION(name, nargs, ...) \
+    nargs,
+
+#define MOTH_DECODE_ARG(arg, type, nargs, offset) \
+    arg = reinterpret_cast<const type *>(code)[-nargs + offset];
+#define MOTH_ADJUST_CODE(type, nargs) \
+    code += static_cast<quintptr>(nargs*sizeof(type) + 1)
+
+#define MOTH_DECODE_INSTRUCTION(name, nargs, ...) \
+        MOTH_DEFINE_ARGS(nargs, __VA_ARGS__) \
+    op_int_##name: \
+        MOTH_ADJUST_CODE(int, nargs); \
+        MOTH_DECODE_ARGS(name, int, nargs, __VA_ARGS__) \
+        goto op_main_##name; \
+    op_char_##name: \
+        MOTH_ADJUST_CODE(char, nargs); \
+        MOTH_DECODE_ARGS(name, char, nargs, __VA_ARGS__) \
+    op_main_##name: \
+        ; \
+
+#define MOTH_DECODE_WITH_BASE_INSTRUCTION(name, nargs, ...) \
+        MOTH_DEFINE_ARGS(nargs, __VA_ARGS__) \
+        const char *base_ptr; \
+    op_int_##name: \
+        base_ptr = code; \
+        MOTH_ADJUST_CODE(int, nargs); \
+        MOTH_DECODE_ARGS(name, int, nargs, __VA_ARGS__) \
+        goto op_main_##name; \
+    op_char_##name: \
+        base_ptr = code; \
+        MOTH_ADJUST_CODE(char, nargs); \
+        MOTH_DECODE_ARGS(name, char, nargs, __VA_ARGS__) \
+    op_main_##name: \
+        ; \
+
+#define MOTH_DECODE_ARGS(name, type, nargs, ...) \
+    MOTH_EXPAND_FOR_MSVC(MOTH_DECODE_ARGS##nargs(name, type, nargs, __VA_ARGS__))
+
+#define MOTH_DECODE_ARGS0(name, type, nargs, dummy)
+#define MOTH_DECODE_ARGS1(name, type, nargs, arg) \
+        MOTH_DECODE_ARG(arg, type, nargs, 0);
+#define MOTH_DECODE_ARGS2(name, type, nargs, arg1, arg2) \
+        MOTH_DECODE_ARGS1(name, type, nargs, arg1); \
+        MOTH_DECODE_ARG(arg2, type, nargs, 1);
+#define MOTH_DECODE_ARGS3(name, type, nargs, arg1, arg2, arg3) \
+        MOTH_DECODE_ARGS2(name, type, nargs, arg1, arg2); \
+        MOTH_DECODE_ARG(arg3, type, nargs, 2);
+#define MOTH_DECODE_ARGS4(name, type, nargs, arg1, arg2, arg3, arg4) \
+        MOTH_DECODE_ARGS3(name, type, nargs, arg1, arg2, arg3); \
+        MOTH_DECODE_ARG(arg4, type, nargs, 3);
+
+#ifdef MOTH_COMPUTED_GOTO
+/* collect jump labels */
+#define COLLECT_LABELS(instr) \
+    INSTR_##instr(GET_LABEL)
+#define GET_LABEL_INSTRUCTION(name, ...) \
+    &&op_char_##name,
+#define COLLECT_LABELS_WIDE(instr) \
+    INSTR_##instr(GET_LABEL_WIDE)
+#define GET_LABEL_WIDE_INSTRUCTION(name, ...) \
+    &&op_int_##name,
+
+#define MOTH_JUMP_TABLE \
+    static const void *jumpTable[] = { \
+        FOR_EACH_MOTH_INSTR(COLLECT_LABELS) \
+        FOR_EACH_MOTH_INSTR(COLLECT_LABELS_WIDE) \
+    };
+
+#define MOTH_DISPATCH() \
+    goto *jumpTable[*reinterpret_cast<const uchar *>(code)];
+#else
+#define MOTH_JUMP_TABLE
+
+#define MOTH_INSTR_CASE_AND_JUMP(instr) \
+    INSTR_##instr(GET_CASE_AND_JUMP)
+#define GET_CASE_AND_JUMP_INSTRUCTION(name, ...) \
+    case static_cast<uchar>(Instr::Type::name): goto op_char_##name;
+#define MOTH_INSTR_CASE_AND_JUMP_WIDE(instr) \
+    INSTR_##instr(GET_CASE_AND_JUMP_WIDE)
+#define GET_CASE_AND_JUMP_WIDE_INSTRUCTION(name, ...) \
+    case (static_cast<uchar>(Instr::Type::name) + MOTH_NUM_INSTRUCTIONS()): goto op_int_##name;
+
+#define MOTH_DISPATCH() \
+    switch (static_cast<uchar>(*code)) { \
+        FOR_EACH_MOTH_INSTR(MOTH_INSTR_CASE_AND_JUMP) \
+        FOR_EACH_MOTH_INSTR(MOTH_INSTR_CASE_AND_JUMP_WIDE) \
+    }
+#endif
 
-#define MOTH_INSTR_ENUM(I, FMT)  I,
-#define MOTH_INSTR_SIZE(I, FMT) ((sizeof(QV4::Moth::Instr::instr_##FMT) + MOTH_INSTR_ALIGN_MASK) & ~MOTH_INSTR_ALIGN_MASK)
+namespace QV4 {
 
+namespace CompiledData {
+struct CodeOffsetToLine;
+}
 
-namespace QV4 {
 namespace Moth {
 
-    // When making changes to the instructions, make sure to bump QV4_DATA_STRUCTURE_VERSION in qv4compileddata_p.h
-
-struct Param {
-    // Params are looked up as follows:
-    // Constant: 0
-    // Temp: 1
-    // Argument: 2
-    // Local: 3
-    // Arg(outer): 4
-    // Local(outer): 5
-    // ...
-    unsigned scope : 12;
-    unsigned index : 20;
-
-    bool isConstant() const { return !scope; }
-    bool isArgument() const { return scope >= 2 && !(scope &1); }
-    bool isLocal() const { return scope == 3; }
-    bool isTemp() const { return scope == 1; }
-    bool isScopedLocal() const { return scope >= 3 && (scope & 1); }
-
-    static Param createConstant(int index)
-    {
-        Param p;
-        p.scope = 0;
-        p.index = index;
-        return p;
-    }
+class StackSlot {
+    int index;
 
-    static Param createArgument(unsigned idx, uint scope)
-    {
-        Param p;
-        p.scope = 2 + 2*scope;
-        p.index = idx;
-        return p;
+public:
+    static StackSlot createRegister(int index) {
+        Q_ASSERT(index >= 0);
+        StackSlot t;
+        t.index = index;
+        return t;
     }
 
-    static Param createLocal(unsigned idx)
-    {
-        Param p;
-        p.scope = 3;
-        p.index = idx;
-        return p;
-    }
+    int stackSlot() const { return index; }
+    operator int() const { return index; }
+};
 
-    static Param createTemp(unsigned idx)
-    {
-        Param p;
-        p.scope = 1;
-        p.index = idx;
-        return p;
-    }
+inline bool operator==(const StackSlot &l, const StackSlot &r) { return l.stackSlot() == r.stackSlot(); }
+inline bool operator!=(const StackSlot &l, const StackSlot &r) { return l.stackSlot() != r.stackSlot(); }
 
-    static Param createScopedLocal(unsigned idx, uint scope)
-    {
-        Param p;
-        p.scope = 3 + 2*scope;
-        p.index = idx;
-        return p;
-    }
+// When making changes to the instructions, make sure to bump QV4_DATA_STRUCTURE_VERSION in qv4compileddata_p.h
 
-    inline bool operator==(const Param &other) const
-    { return scope == other.scope && index == other.index; }
-
-    inline bool operator!=(const Param &other) const
-    { return !(*this == other); }
-};
+void dumpConstantTable(const Value *constants, uint count);
+void dumpBytecode(const char *bytecode, int len, int nLocals, int nFormals, int startLine = 1,
+                  const QVector<CompiledData::CodeOffsetToLine> &lineNumberMapping = QVector<CompiledData::CodeOffsetToLine>());
+inline void dumpBytecode(const QByteArray &bytecode, int nLocals, int nFormals, int startLine = 1,
+                         const QVector<CompiledData::CodeOffsetToLine> &lineNumberMapping = QVector<CompiledData::CodeOffsetToLine>()) {
+    dumpBytecode(bytecode.constData(), bytecode.length(), nLocals, nFormals, startLine, lineNumberMapping);
+}
 
 union Instr
 {
-    enum Type {
+    enum class Type {
         FOR_EACH_MOTH_INSTR(MOTH_INSTR_ENUM)
-        LastInstruction
     };
 
-    struct instr_common {
-        MOTH_INSTR_HEADER
-    };
-    struct instr_ret {
-        MOTH_INSTR_HEADER
-        Param result;
-    };
-
-#ifndef QT_NO_QML_DEBUGGING
-    struct instr_line {
-        MOTH_INSTR_HEADER
-        qint32 lineNumber;
-    };
-    struct instr_debug {
-        MOTH_INSTR_HEADER
-        qint32 lineNumber;
-    };
-#endif // QT_NO_QML_DEBUGGING
+    FOR_EACH_MOTH_INSTR(MOTH_EMIT_STRUCTS)
 
-    struct instr_loadRuntimeString {
-        MOTH_INSTR_HEADER
-        int stringId;
-        Param result;
-    };
-    struct instr_loadRegExp {
-        MOTH_INSTR_HEADER
-        int regExpId;
-        Param result;
-    };
-    struct instr_move {
-        MOTH_INSTR_HEADER
-        Param source;
-        Param result;
-    };
-    struct instr_moveConst {
-        MOTH_INSTR_HEADER
-        QV4::ReturnedValue source;
-        Param result;
-    };
-    struct instr_swapTemps {
-        MOTH_INSTR_HEADER
-        Param left;
-        Param right;
-    };
-    struct instr_loadClosure {
-        MOTH_INSTR_HEADER
-        int value;
-        Param result;
-    };
-    struct instr_loadName {
-        MOTH_INSTR_HEADER
-        int name;
-        Param result;
-    };
-    struct instr_getGlobalLookup {
-        MOTH_INSTR_HEADER
-        int index;
-        Param result;
-    };
-    struct instr_storeName {
-        MOTH_INSTR_HEADER
-        int name;
-        Param source;
-    };
-    struct instr_loadProperty {
-        MOTH_INSTR_HEADER
-        int name;
-        Param base;
-        Param result;
-    };
-    struct instr_getLookup {
-        MOTH_INSTR_HEADER
-        int index;
-        Param base;
-        Param result;
-    };
-    struct instr_loadScopeObjectProperty {
-        MOTH_INSTR_HEADER
-        int propertyIndex;
-        Param base;
-        Param result;
-        bool captureRequired;
-    };
-    struct instr_loadContextObjectProperty {
-        MOTH_INSTR_HEADER
-        int propertyIndex;
-        Param base;
-        Param result;
-        bool captureRequired;
-    };
-    struct instr_loadIdObject {
-        MOTH_INSTR_HEADER
-        int index;
-        Param base;
-        Param result;
-    };
-    struct instr_loadQObjectProperty {
-        MOTH_INSTR_HEADER
-        int propertyIndex;
-        Param base;
-        Param result;
-        bool captureRequired;
-    };
-    struct instr_loadAttachedQObjectProperty {
-        MOTH_INSTR_HEADER
-        int propertyIndex;
-        Param result;
-        int attachedPropertiesId;
-    };
-    struct instr_storeProperty {
-        MOTH_INSTR_HEADER
-        int name;
-        Param base;
-        Param source;
-    };
-    struct instr_setLookup {
-        MOTH_INSTR_HEADER
-        int index;
-        Param base;
-        Param source;
-    };
-    struct instr_storeScopeObjectProperty {
-        MOTH_INSTR_HEADER
-        Param base;
-        int propertyIndex;
-        Param source;
-    };
-    struct instr_storeContextObjectProperty {
-        MOTH_INSTR_HEADER
-        Param base;
-        int propertyIndex;
-        Param source;
-    };
-    struct instr_storeQObjectProperty {
-        MOTH_INSTR_HEADER
-        Param base;
-        int propertyIndex;
-        Param source;
-    };
-    struct instr_loadElement {
-        MOTH_INSTR_HEADER
-        Param base;
-        Param index;
-        Param result;
-    };
-    struct instr_loadElementLookup {
-        MOTH_INSTR_HEADER
-        uint lookup;
-        Param base;
-        Param index;
-        Param result;
-    };
-    struct instr_storeElement {
-        MOTH_INSTR_HEADER
-        Param base;
-        Param index;
-        Param source;
-    };
-    struct instr_storeElementLookup {
-        MOTH_INSTR_HEADER
-        uint lookup;
-        Param base;
-        Param index;
-        Param source;
-    };
-    struct instr_push {
-        MOTH_INSTR_HEADER
-        quint32 value;
-    };
-    struct instr_callValue {
-        MOTH_INSTR_HEADER
-        quint32 argc;
-        quint32 callData;
-        Param dest;
-        Param result;
-    };
-    struct instr_callProperty {
-        MOTH_INSTR_HEADER
-        int name;
-        quint32 argc;
-        quint32 callData;
-        Param base;
-        Param result;
-    };
-    struct instr_callPropertyLookup {
-        MOTH_INSTR_HEADER
-        int lookupIndex;
-        quint32 argc;
-        quint32 callData;
-        Param base;
-        Param result;
-    };
-    struct instr_callScopeObjectProperty {
-        MOTH_INSTR_HEADER
-        int index;
-        quint32 argc;
-        quint32 callData;
-        Param base;
-        Param result;
-    };
-    struct instr_callContextObjectProperty {
-        MOTH_INSTR_HEADER
-        int index;
-        quint32 argc;
-        quint32 callData;
-        Param base;
-        Param result;
-    };
-    struct instr_callElement {
-        MOTH_INSTR_HEADER
-        Param base;
-        Param index;
-        quint32 argc;
-        quint32 callData;
-        Param result;
-    };
-    struct instr_callActivationProperty {
-        MOTH_INSTR_HEADER
-        int name;
-        quint32 argc;
-        quint32 callData;
-        Param result;
-    };
-    struct instr_callGlobalLookup {
-        MOTH_INSTR_HEADER
-        int index;
-        quint32 argc;
-        quint32 callData;
-        Param result;
-    };
-    struct instr_setExceptionHandler {
-        MOTH_INSTR_HEADER
-        qptrdiff offset;
-    };
-    struct instr_callBuiltinThrow {
-        MOTH_INSTR_HEADER
-        Param arg;
-    };
-    struct instr_callBuiltinUnwindException {
-        MOTH_INSTR_HEADER
-        Param result;
-    };
-    struct instr_callBuiltinPushCatchScope {
-        MOTH_INSTR_HEADER
-        int name;
-    };
-    struct instr_callBuiltinPushScope {
-        MOTH_INSTR_HEADER
-        Param arg;
-    };
-    struct instr_callBuiltinPopScope {
-        MOTH_INSTR_HEADER
-    };
-    struct instr_callBuiltinForeachIteratorObject {
-        MOTH_INSTR_HEADER
-        Param arg;
-        Param result;
-    };
-    struct instr_callBuiltinForeachNextPropertyName {
-        MOTH_INSTR_HEADER
-        Param arg;
-        Param result;
-    };
-    struct instr_callBuiltinDeleteMember {
-        MOTH_INSTR_HEADER
-        int member;
-        Param base;
-        Param result;
-    };
-    struct instr_callBuiltinDeleteSubscript {
-        MOTH_INSTR_HEADER
-        Param base;
-        Param index;
-        Param result;
-    };
-    struct instr_callBuiltinDeleteName {
-        MOTH_INSTR_HEADER
-        int name;
-        Param result;
-    };
-    struct instr_callBuiltinTypeofScopeObjectProperty {
-        MOTH_INSTR_HEADER
-        int index;
-        Param base;
-        Param result;
-    };
-    struct instr_callBuiltinTypeofContextObjectProperty {
-        MOTH_INSTR_HEADER
-        int index;
-        Param base;
-        Param result;
-    };
-    struct instr_callBuiltinTypeofMember {
-        MOTH_INSTR_HEADER
-        int member;
-        Param base;
-        Param result;
-    };
-    struct instr_callBuiltinTypeofSubscript {
-        MOTH_INSTR_HEADER
-        Param base;
-        Param index;
-        Param result;
-    };
-    struct instr_callBuiltinTypeofName {
-        MOTH_INSTR_HEADER
-        int name;
-        Param result;
-    };
-    struct instr_callBuiltinTypeofValue {
-        MOTH_INSTR_HEADER
-        Param value;
-        Param result;
-    };
-    struct instr_callBuiltinDeclareVar {
-        MOTH_INSTR_HEADER
-        int varName;
-        bool isDeletable;
-    };
-    struct instr_callBuiltinDefineArray {
-        MOTH_INSTR_HEADER
-        quint32 argc;
-        quint32 args;
-        Param result;
-    };
-    struct instr_callBuiltinDefineObjectLiteral {
-        MOTH_INSTR_HEADER
-        int internalClassId;
-        uint arrayValueCount;
-        uint arrayGetterSetterCountAndFlags; // 30 bits for count, 1 bit for needsSparseArray boolean
-        quint32 args;
-        Param result;
-    };
-    struct instr_callBuiltinSetupArgumentsObject {
-        MOTH_INSTR_HEADER
-        Param result;
-    };
-    struct instr_callBuiltinConvertThisToObject {
-        MOTH_INSTR_HEADER
-    };
-    struct instr_createValue {
-        MOTH_INSTR_HEADER
-        quint32 argc;
-        quint32 callData;
-        Param func;
-        Param result;
-    };
-    struct instr_createProperty {
-        MOTH_INSTR_HEADER
-        int name;
-        quint32 argc;
-        quint32 callData;
-        Param base;
-        Param result;
-    };
-    struct instr_constructPropertyLookup {
-        MOTH_INSTR_HEADER
-        int index;
-        quint32 argc;
-        quint32 callData;
-        Param base;
-        Param result;
-    };
-    struct instr_createActivationProperty {
-        MOTH_INSTR_HEADER
-        int name;
-        quint32 argc;
-        quint32 callData;
-        Param result;
-    };
-    struct instr_constructGlobalLookup {
-        MOTH_INSTR_HEADER
-        int index;
-        quint32 argc;
-        quint32 callData;
-        Param result;
-    };
-    struct instr_jump {
-        MOTH_INSTR_HEADER
-        ptrdiff_t offset;
-    };
-    struct instr_jumpEq {
-        MOTH_INSTR_HEADER
-        ptrdiff_t offset;
-        Param condition;
-    };
-    struct instr_jumpNe {
-        MOTH_INSTR_HEADER
-        ptrdiff_t offset;
-        Param condition;
-    };
-    struct instr_unot {
-        MOTH_INSTR_HEADER
-        Param source;
-        Param result;
-    };
-    struct instr_unotBool {
-        MOTH_INSTR_HEADER
-        Param source;
-        Param result;
-    };
-    struct instr_uplus {
-        MOTH_INSTR_HEADER
-        Param source;
-        Param result;
-    };
-    struct instr_uminus {
-        MOTH_INSTR_HEADER
-        Param source;
-        Param result;
-    };
-    struct instr_ucompl {
-        MOTH_INSTR_HEADER
-        Param source;
-        Param result;
-    };
-    struct instr_ucomplInt {
-        MOTH_INSTR_HEADER
-        Param source;
-        Param result;
-    };
-    struct instr_increment {
-        MOTH_INSTR_HEADER
-        Param source;
-        Param result;
-    };
-    struct instr_decrement {
-        MOTH_INSTR_HEADER
-        Param source;
-        Param result;
-    };
-    struct instr_binop {
-        MOTH_INSTR_HEADER
-        int alu; // QV4::Runtime::RuntimeMethods enum value
-        Param lhs;
-        Param rhs;
-        Param result;
-    };
-    struct instr_add {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        Param rhs;
-        Param result;
-    };
-    struct instr_bitAnd {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        Param rhs;
-        Param result;
-    };
-    struct instr_bitOr {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        Param rhs;
-        Param result;
-    };
-    struct instr_bitXor {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        Param rhs;
-        Param result;
-    };
-    struct instr_shr {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        Param rhs;
-        Param result;
-    };
-    struct instr_shl {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        Param rhs;
-        Param result;
-    };
-    struct instr_bitAndConst {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        int rhs;
-        Param result;
-    };
-    struct instr_bitOrConst {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        int rhs;
-        Param result;
-    };
-    struct instr_bitXorConst {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        int rhs;
-        Param result;
-    };
-    struct instr_shrConst {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        int rhs;
-        Param result;
-    };
-    struct instr_shlConst {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        int rhs;
-        Param result;
-    };
-    struct instr_mul {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        Param rhs;
-        Param result;
-    };
-    struct instr_sub {
-        MOTH_INSTR_HEADER
-        Param lhs;
-        Param rhs;
-        Param result;
-    };
-    struct instr_binopContext {
-        MOTH_INSTR_HEADER
-        uint alu; // offset inside the runtime methods
-        Param lhs;
-        Param rhs;
-        Param result;
-    };
-    struct instr_loadThis {
-        MOTH_INSTR_HEADER
-        Param result;
-    };
-    struct instr_loadQmlContext {
-        MOTH_INSTR_HEADER
-        Param result;
-    };
-    struct instr_loadQmlImportedScripts {
-        MOTH_INSTR_HEADER
-        Param result;
-    };
-    struct instr_loadQmlSingleton {
-        MOTH_INSTR_HEADER
-        Param result;
-        int name;
-    };
+    FOR_EACH_MOTH_INSTR(MOTH_EMIT_INSTR_MEMBERS)
+};
 
-    instr_common common;
-    instr_ret ret;
-    instr_line line;
-    instr_debug debug;
-    instr_loadRuntimeString loadRuntimeString;
-    instr_loadRegExp loadRegExp;
-    instr_move move;
-    instr_moveConst moveConst;
-    instr_swapTemps swapTemps;
-    instr_loadClosure loadClosure;
-    instr_loadName loadName;
-    instr_getGlobalLookup getGlobalLookup;
-    instr_storeName storeName;
-    instr_loadElement loadElement;
-    instr_loadElementLookup loadElementLookup;
-    instr_storeElement storeElement;
-    instr_storeElementLookup storeElementLookup;
-    instr_loadProperty loadProperty;
-    instr_getLookup getLookup;
-    instr_loadScopeObjectProperty loadScopeObjectProperty;
-    instr_loadContextObjectProperty loadContextObjectProperty;
-    instr_loadIdObject loadIdObject;
-    instr_loadQObjectProperty loadQObjectProperty;
-    instr_loadAttachedQObjectProperty loadAttachedQObjectProperty;
-    instr_storeProperty storeProperty;
-    instr_setLookup setLookup;
-    instr_storeScopeObjectProperty storeScopeObjectProperty;
-    instr_storeContextObjectProperty storeContextObjectProperty;
-    instr_storeQObjectProperty storeQObjectProperty;
-    instr_push push;
-    instr_callValue callValue;
-    instr_callProperty callProperty;
-    instr_callPropertyLookup callPropertyLookup;
-    instr_callScopeObjectProperty callScopeObjectProperty;
-    instr_callContextObjectProperty callContextObjectProperty;
-    instr_callElement callElement;
-    instr_callActivationProperty callActivationProperty;
-    instr_callGlobalLookup callGlobalLookup;
-    instr_callBuiltinThrow callBuiltinThrow;
-    instr_setExceptionHandler setExceptionHandler;
-    instr_callBuiltinUnwindException callBuiltinUnwindException;
-    instr_callBuiltinPushCatchScope callBuiltinPushCatchScope;
-    instr_callBuiltinPushScope callBuiltinPushScope;
-    instr_callBuiltinPopScope callBuiltinPopScope;
-    instr_callBuiltinForeachIteratorObject callBuiltinForeachIteratorObject;
-    instr_callBuiltinForeachNextPropertyName callBuiltinForeachNextPropertyName;
-    instr_callBuiltinDeleteMember callBuiltinDeleteMember;
-    instr_callBuiltinDeleteSubscript callBuiltinDeleteSubscript;
-    instr_callBuiltinDeleteName callBuiltinDeleteName;
-    instr_callBuiltinTypeofScopeObjectProperty callBuiltinTypeofScopeObjectProperty;
-    instr_callBuiltinTypeofContextObjectProperty callBuiltinTypeofContextObjectProperty;
-    instr_callBuiltinTypeofMember callBuiltinTypeofMember;
-    instr_callBuiltinTypeofSubscript callBuiltinTypeofSubscript;
-    instr_callBuiltinTypeofName callBuiltinTypeofName;
-    instr_callBuiltinTypeofValue callBuiltinTypeofValue;
-    instr_callBuiltinDeclareVar callBuiltinDeclareVar;
-    instr_callBuiltinDefineArray callBuiltinDefineArray;
-    instr_callBuiltinDefineObjectLiteral callBuiltinDefineObjectLiteral;
-    instr_callBuiltinSetupArgumentsObject callBuiltinSetupArgumentsObject;
-    instr_callBuiltinConvertThisToObject callBuiltinConvertThisToObject;
-    instr_createValue createValue;
-    instr_createProperty createProperty;
-    instr_constructPropertyLookup constructPropertyLookup;
-    instr_createActivationProperty createActivationProperty;
-    instr_constructGlobalLookup constructGlobalLookup;
-    instr_jump jump;
-    instr_jumpEq jumpEq;
-    instr_jumpNe jumpNe;
-    instr_unot unot;
-    instr_unotBool unotBool;
-    instr_uplus uplus;
-    instr_uminus uminus;
-    instr_ucompl ucompl;
-    instr_ucomplInt ucomplInt;
-    instr_increment increment;
-    instr_decrement decrement;
-    instr_binop binop;
-    instr_add add;
-    instr_bitAnd bitAnd;
-    instr_bitOr bitOr;
-    instr_bitXor bitXor;
-    instr_shr shr;
-    instr_shl shl;
-    instr_bitAndConst bitAndConst;
-    instr_bitOrConst bitOrConst;
-    instr_bitXorConst bitXorConst;
-    instr_shrConst shrConst;
-    instr_shlConst shlConst;
-    instr_mul mul;
-    instr_sub sub;
-    instr_binopContext binopContext;
-    instr_loadThis loadThis;
-    instr_loadQmlContext loadQmlContext;
-    instr_loadQmlImportedScripts loadQmlImportedScripts;
-    instr_loadQmlSingleton loadQmlSingleton;
-
-    static int size(Type type);
+struct InstrInfo
+{
+    static const int argumentCount[];
+    static int size(Instr::Type type);
 };
 
+Q_STATIC_ASSERT(MOTH_NUM_INSTRUCTIONS() < 128);
+
 template<int N>
 struct InstrMeta {
 };
 
 QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Wuninitialized")
-#define MOTH_INSTR_META_TEMPLATE(I, FMT) \
-    template<> struct InstrMeta<(int)Instr::I> { \
-        enum { Size = MOTH_INSTR_SIZE(I, FMT) }; \
-        typedef Instr::instr_##FMT DataType; \
-        static const DataType &data(const Instr &instr) { return instr.FMT; } \
-        static void setData(Instr &instr, const DataType &v) { instr.FMT = v; } \
-        static void setDataNoCommon(Instr &instr, const DataType &v) \
-        { memcpy(reinterpret_cast<char *>(&instr.FMT) + sizeof(Instr::instr_common), \
-                 reinterpret_cast<const char *>(&v) + sizeof(Instr::instr_common), \
-                 Size - sizeof(Instr::instr_common)); } \
+QT_WARNING_DISABLE_GCC("-Wmaybe-uninitialized")
+#define MOTH_INSTR_META_TEMPLATE(I) \
+    template<> struct InstrMeta<int(Instr::Type::I)> { \
+        enum { Size = MOTH_INSTR_SIZE(I) }; \
+        typedef Instr::instr_##I DataType; \
+        static const DataType &data(const Instr &instr) { return instr.I; } \
+        static void setData(Instr &instr, const DataType &v) \
+        { memcpy(reinterpret_cast<char *>(&instr.I), \
+                 reinterpret_cast<const char *>(&v), \
+                 Size); } \
     };
 FOR_EACH_MOTH_INSTR(MOTH_INSTR_META_TEMPLATE);
 #undef MOTH_INSTR_META_TEMPLATE
@@ -919,6 +519,14 @@ class InstrData : public InstrMeta<InstrType>::DataType
 {
 };
 
+struct Instruction {
+#define MOTH_INSTR_DATA_TYPEDEF(I) typedef InstrData<int(Instr::Type::I)> I;
+FOR_EACH_MOTH_INSTR(MOTH_INSTR_DATA_TYPEDEF)
+#undef MOTH_INSTR_DATA_TYPEDEF
+private:
+    Instruction();
+};
+
 } // namespace Moth
 } // namespace QV4
 
diff --git a/src/qml/compiler/qv4isel_moth.cpp b/src/qml/compiler/qv4isel_moth.cpp
deleted file mode 100644
index d25d1733c8..0000000000
--- a/src/qml/compiler/qv4isel_moth.cpp
+++ /dev/null
@@ -1,1522 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qv4isel_util_p.h"
-#include "qv4isel_moth_p.h"
-#include "qv4ssa_p.h"
-#include <private/qv4compileddata_p.h>
-#include <wtf/MathExtras.h>
-
-#if !defined(V4_BOOTSTRAP)
-#include "qv4vme_moth_p.h"
-#include <private/qv4function_p.h>
-#endif
-
-#undef USE_TYPE_INFO
-
-using namespace QV4;
-using namespace QV4::Moth;
-
-namespace {
-
-inline QV4::Runtime::RuntimeMethods aluOpFunction(IR::AluOp op)
-{
-    switch (op) {
-    case IR::OpInvalid:
-        return QV4::Runtime::InvalidRuntimeMethod;
-    case IR::OpIfTrue:
-        return QV4::Runtime::InvalidRuntimeMethod;
-    case IR::OpNot:
-        return QV4::Runtime::InvalidRuntimeMethod;
-    case IR::OpUMinus:
-        return QV4::Runtime::InvalidRuntimeMethod;
-    case IR::OpUPlus:
-        return QV4::Runtime::InvalidRuntimeMethod;
-    case IR::OpCompl:
-        return QV4::Runtime::InvalidRuntimeMethod;
-    case IR::OpBitAnd:
-        return QV4::Runtime::bitAnd;
-    case IR::OpBitOr:
-        return QV4::Runtime::bitOr;
-    case IR::OpBitXor:
-        return QV4::Runtime::bitXor;
-    case IR::OpAdd:
-        return QV4::Runtime::InvalidRuntimeMethod;
-    case IR::OpSub:
-        return QV4::Runtime::sub;
-    case IR::OpMul:
-        return QV4::Runtime::mul;
-    case IR::OpDiv:
-        return QV4::Runtime::div;
-    case IR::OpMod:
-        return QV4::Runtime::mod;
-    case IR::OpLShift:
-        return QV4::Runtime::shl;
-    case IR::OpRShift:
-        return QV4::Runtime::shr;
-    case IR::OpURShift:
-        return QV4::Runtime::ushr;
-    case IR::OpGt:
-        return QV4::Runtime::greaterThan;
-    case IR::OpLt:
-        return QV4::Runtime::lessThan;
-    case IR::OpGe:
-        return QV4::Runtime::greaterEqual;
-    case IR::OpLe:
-        return QV4::Runtime::lessEqual;
-    case IR::OpEqual:
-        return QV4::Runtime::equal;
-    case IR::OpNotEqual:
-        return QV4::Runtime::notEqual;
-    case IR::OpStrictEqual:
-        return QV4::Runtime::strictEqual;
-    case IR::OpStrictNotEqual:
-        return QV4::Runtime::strictNotEqual;
-    case IR::OpInstanceof:
-        return QV4::Runtime::InvalidRuntimeMethod;
-    case IR::OpIn:
-        return QV4::Runtime::InvalidRuntimeMethod;
-    case IR::OpAnd:
-        return QV4::Runtime::InvalidRuntimeMethod;
-    case IR::OpOr:
-        return QV4::Runtime::InvalidRuntimeMethod;
-    default:
-        Q_ASSERT(!"Unknown AluOp");
-        return QV4::Runtime::InvalidRuntimeMethod;
-    }
-};
-
-inline bool isNumberType(IR::Expr *e)
-{
-    switch (e->type) {
-    case IR::SInt32Type:
-    case IR::UInt32Type:
-    case IR::DoubleType:
-        return true;
-    default:
-        return false;
-    }
-}
-
-inline bool isIntegerType(IR::Expr *e)
-{
-    switch (e->type) {
-    case IR::SInt32Type:
-    case IR::UInt32Type:
-        return true;
-    default:
-        return false;
-    }
-}
-
-inline bool isBoolType(IR::Expr *e)
-{
-    return (e->type == IR::BoolType);
-}
-
-} // anonymous namespace
-
-InstructionSelection::InstructionSelection(QQmlEnginePrivate *qmlEngine, QV4::ExecutableAllocator *execAllocator, IR::Module *module, QV4::Compiler::JSUnitGenerator *jsGenerator, EvalISelFactory *iselFactory)
-    : EvalInstructionSelection(execAllocator, module, jsGenerator, iselFactory)
-    , qmlEngine(qmlEngine)
-    , _block(0)
-    , _codeStart(0)
-    , _codeNext(0)
-    , _codeEnd(0)
-    , _currentStatement(0)
-    , compilationUnit(new CompilationUnit)
-{
-    setUseTypeInference(false);
-}
-
-InstructionSelection::~InstructionSelection()
-{
-}
-
-void InstructionSelection::run(int functionIndex)
-{
-    IR::Function *function = irModule->functions[functionIndex];
-    IR::BasicBlock *block = 0, *nextBlock = 0;
-
-    QHash<IR::BasicBlock *, QVector<ptrdiff_t> > patches;
-    QHash<IR::BasicBlock *, ptrdiff_t> addrs;
-
-    int codeSize = 4096;
-    uchar *codeStart = new uchar[codeSize];
-    memset(codeStart, 0, codeSize);
-    uchar *codeNext = codeStart;
-    uchar *codeEnd = codeStart + codeSize;
-
-    qSwap(_function, function);
-    qSwap(block, _block);
-    qSwap(nextBlock, _nextBlock);
-    qSwap(patches, _patches);
-    qSwap(addrs, _addrs);
-    qSwap(codeStart, _codeStart);
-    qSwap(codeNext, _codeNext);
-    qSwap(codeEnd, _codeEnd);
-
-    IR::Optimizer opt(_function);
-    opt.run(qmlEngine, useTypeInference, /*peelLoops =*/ false);
-    if (opt.isInSSA()) {
-        static const bool doStackSlotAllocation =
-                qEnvironmentVariableIsEmpty("QV4_NO_INTERPRETER_STACK_SLOT_ALLOCATION");
-
-        if (doStackSlotAllocation) {
-            IR::AllocateStackSlots(opt.lifeTimeIntervals()).forFunction(_function);
-        } else {
-            opt.convertOutOfSSA();
-            ConvertTemps().toStackSlots(_function);
-        }
-        opt.showMeTheCode(_function, "After stack slot allocation");
-    } else {
-        ConvertTemps().toStackSlots(_function);
-    }
-
-    BitVector removableJumps = opt.calculateOptionalJumps();
-    qSwap(_removableJumps, removableJumps);
-
-    IR::Stmt *cs = 0;
-    qSwap(_currentStatement, cs);
-
-    int locals = frameSize();
-    Q_ASSERT(locals >= 0);
-
-    IR::BasicBlock *exceptionHandler = 0;
-
-    Instruction::Push push;
-    push.value = quint32(locals);
-    addInstruction(push);
-
-    currentLine = 0;
-    const QVector<IR::BasicBlock *> &basicBlocks = _function->basicBlocks();
-    for (int i = 0, ei = basicBlocks.size(); i != ei; ++i) {
-        blockNeedsDebugInstruction = irModule->debugMode;
-        _block = basicBlocks[i];
-        _nextBlock = (i < ei - 1) ? basicBlocks[i + 1] : 0;
-        _addrs.insert(_block, _codeNext - _codeStart);
-
-        if (_block->catchBlock != exceptionHandler) {
-            Instruction::SetExceptionHandler set;
-            set.offset = 0;
-            if (_block->catchBlock) {
-                ptrdiff_t loc = addInstruction(set) + (((const char *)&set.offset) - ((const char *)&set));
-                _patches[_block->catchBlock].append(loc);
-            } else {
-                addInstruction(set);
-            }
-            exceptionHandler = _block->catchBlock;
-        } else if (_block->catchBlock == nullptr && _block->index() != 0 && _block->in.isEmpty()) {
-            exceptionHandler = nullptr;
-            Instruction::SetExceptionHandler set;
-            set.offset = 0;
-            addInstruction(set);
-        }
-
-        for (IR::Stmt *s : _block->statements()) {
-            _currentStatement = s;
-
-            if (s->location.isValid()) {
-                if (s->location.startLine != currentLine) {
-                    blockNeedsDebugInstruction = false;
-                    currentLine = s->location.startLine;
-#if QT_CONFIG(qml_debug)
-                    if (irModule->debugMode) {
-                        Instruction::Debug debug;
-                        debug.lineNumber = currentLine;
-                        addInstruction(debug);
-                    } else {
-                        Instruction::Line line;
-                        line.lineNumber = currentLine;
-                        addInstruction(line);
-                    }
-#endif
-                }
-            }
-
-            visit(s);
-        }
-    }
-
-    // TODO: patch stack size (the push instruction)
-    patchJumpAddresses();
-
-    codeRefs.insert(_function, squeezeCode());
-
-    qSwap(_currentStatement, cs);
-    qSwap(_removableJumps, removableJumps);
-    qSwap(_function, function);
-    qSwap(block, _block);
-    qSwap(nextBlock, _nextBlock);
-    qSwap(patches, _patches);
-    qSwap(addrs, _addrs);
-    qSwap(codeStart, _codeStart);
-    qSwap(codeNext, _codeNext);
-    qSwap(codeEnd, _codeEnd);
-
-    delete[] codeStart;
-}
-
-QQmlRefPointer<QV4::CompiledData::CompilationUnit> InstructionSelection::backendCompileStep()
-{
-    compilationUnit->codeRefs.resize(irModule->functions.size());
-    int i = 0;
-    for (IR::Function *irFunction : qAsConst(irModule->functions))
-        compilationUnit->codeRefs[i++] = codeRefs[irFunction];
-    QQmlRefPointer<QV4::CompiledData::CompilationUnit> result;
-    result.adopt(compilationUnit.take());
-    return result;
-}
-
-void InstructionSelection::callValue(IR::Expr *value, IR::ExprList *args, IR::Expr *result)
-{
-    Instruction::CallValue call;
-    prepareCallArgs(args, call.argc);
-    call.callData = callDataStart();
-    call.dest = getParam(value);
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callQmlContextProperty(IR::Expr *base, IR::Member::MemberKind kind, int propertyIndex, IR::ExprList *args, IR::Expr *result)
-{
-    if (kind == IR::Member::MemberOfQmlScopeObject) {
-        Instruction::CallScopeObjectProperty call;
-        call.base = getParam(base);
-        call.index = propertyIndex;
-        prepareCallArgs(args, call.argc);
-        call.callData = callDataStart();
-        call.result = getResultParam(result);
-        addInstruction(call);
-    } else if (kind == IR::Member::MemberOfQmlContextObject) {
-        Instruction::CallContextObjectProperty call;
-        call.base = getParam(base);
-        call.index = propertyIndex;
-        prepareCallArgs(args, call.argc);
-        call.callData = callDataStart();
-        call.result = getResultParam(result);
-        addInstruction(call);
-    } else {
-        Q_ASSERT(false);
-    }
-}
-
-void InstructionSelection::callProperty(IR::Expr *base, const QString &name, IR::ExprList *args,
-                                        IR::Expr *result)
-{
-    if (useFastLookups) {
-        Instruction::CallPropertyLookup call;
-        call.base = getParam(base);
-        call.lookupIndex = registerGetterLookup(name);
-        prepareCallArgs(args, call.argc);
-        call.callData = callDataStart();
-        call.result = getResultParam(result);
-        addInstruction(call);
-    } else {
-        // call the property on the loaded base
-        Instruction::CallProperty call;
-        call.base = getParam(base);
-        call.name = registerString(name);
-        prepareCallArgs(args, call.argc);
-        call.callData = callDataStart();
-        call.result = getResultParam(result);
-        addInstruction(call);
-    }
-}
-
-void InstructionSelection::callSubscript(IR::Expr *base, IR::Expr *index, IR::ExprList *args,
-                                         IR::Expr *result)
-{
-    // call the property on the loaded base
-    Instruction::CallElement call;
-    call.base = getParam(base);
-    call.index = getParam(index);
-    prepareCallArgs(args, call.argc);
-    call.callData = callDataStart();
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::convertType(IR::Expr *source, IR::Expr *target)
-{
-    // FIXME: do something more useful with this info
-    if (target->type & IR::NumberType && !(source->type & IR::NumberType))
-        unop(IR::OpUPlus, source, target);
-    else
-        copyValue(source, target);
-}
-
-void InstructionSelection::constructActivationProperty(IR::Name *func,
-                                                       IR::ExprList *args,
-                                                       IR::Expr *target)
-{
-    if (useFastLookups && func->global) {
-        Instruction::ConstructGlobalLookup call;
-        call.index = registerGlobalGetterLookup(*func->id);
-        prepareCallArgs(args, call.argc);
-        call.callData = callDataStart();
-        call.result = getResultParam(target);
-        addInstruction(call);
-        return;
-    }
-    Instruction::CreateActivationProperty create;
-    create.name = registerString(*func->id);
-    prepareCallArgs(args, create.argc);
-    create.callData = callDataStart();
-    create.result = getResultParam(target);
-    addInstruction(create);
-}
-
-void InstructionSelection::constructProperty(IR::Expr *base, const QString &name, IR::ExprList *args, IR::Expr *target)
-{
-    if (useFastLookups) {
-        Instruction::ConstructPropertyLookup call;
-        call.base = getParam(base);
-        call.index = registerGetterLookup(name);
-        prepareCallArgs(args, call.argc);
-        call.callData = callDataStart();
-        call.result = getResultParam(target);
-        addInstruction(call);
-        return;
-    }
-    Instruction::CreateProperty create;
-    create.base = getParam(base);
-    create.name = registerString(name);
-    prepareCallArgs(args, create.argc);
-    create.callData = callDataStart();
-    create.result = getResultParam(target);
-    addInstruction(create);
-}
-
-void InstructionSelection::constructValue(IR::Expr *value, IR::ExprList *args, IR::Expr *target)
-{
-    Instruction::CreateValue create;
-    create.func = getParam(value);
-    prepareCallArgs(args, create.argc);
-    create.callData = callDataStart();
-    create.result = getResultParam(target);
-    addInstruction(create);
-}
-
-void InstructionSelection::loadThisObject(IR::Expr *e)
-{
-    Instruction::LoadThis load;
-    load.result = getResultParam(e);
-    addInstruction(load);
-}
-
-void InstructionSelection::loadQmlContext(IR::Expr *e)
-{
-    Instruction::LoadQmlContext load;
-    load.result = getResultParam(e);
-    addInstruction(load);
-}
-
-void InstructionSelection::loadQmlImportedScripts(IR::Expr *e)
-{
-    Instruction::LoadQmlImportedScripts load;
-    load.result = getResultParam(e);
-    addInstruction(load);
-}
-
-void InstructionSelection::loadQmlSingleton(const QString &name, IR::Expr *e)
-{
-    Instruction::LoadQmlSingleton load;
-    load.result = getResultParam(e);
-    load.name = registerString(name);
-    addInstruction(load);
-}
-
-void InstructionSelection::loadConst(IR::Const *sourceConst, IR::Expr *e)
-{
-    Q_ASSERT(sourceConst);
-
-    Instruction::MoveConst move;
-    move.source = convertToValue(sourceConst).asReturnedValue();
-    move.result = getResultParam(e);
-    addInstruction(move);
-}
-
-void InstructionSelection::loadString(const QString &str, IR::Expr *target)
-{
-    Instruction::LoadRuntimeString load;
-    load.stringId = registerString(str);
-    load.result = getResultParam(target);
-    addInstruction(load);
-}
-
-void InstructionSelection::loadRegexp(IR::RegExp *sourceRegexp, IR::Expr *target)
-{
-    Instruction::LoadRegExp load;
-    load.regExpId = registerRegExp(sourceRegexp);
-    load.result = getResultParam(target);
-    addInstruction(load);
-}
-
-void InstructionSelection::getActivationProperty(const IR::Name *name, IR::Expr *target)
-{
-    if (useFastLookups && name->global) {
-        Instruction::GetGlobalLookup load;
-        load.index = registerGlobalGetterLookup(*name->id);
-        load.result = getResultParam(target);
-        addInstruction(load);
-        return;
-    }
-    Instruction::LoadName load;
-    load.name = registerString(*name->id);
-    load.result = getResultParam(target);
-    addInstruction(load);
-}
-
-void InstructionSelection::setActivationProperty(IR::Expr *source, const QString &targetName)
-{
-    Instruction::StoreName store;
-    store.source = getParam(source);
-    store.name = registerString(targetName);
-    addInstruction(store);
-}
-
-void InstructionSelection::initClosure(IR::Closure *closure, IR::Expr *target)
-{
-    int id = closure->value;
-    Instruction::LoadClosure load;
-    load.value = id;
-    load.result = getResultParam(target);
-    addInstruction(load);
-}
-
-void InstructionSelection::getProperty(IR::Expr *base, const QString &name, IR::Expr *target)
-{
-    if (useFastLookups) {
-        Instruction::GetLookup load;
-        load.base = getParam(base);
-        load.index = registerGetterLookup(name);
-        load.result = getResultParam(target);
-        addInstruction(load);
-        return;
-    }
-    Instruction::LoadProperty load;
-    load.base = getParam(base);
-    load.name = registerString(name);
-    load.result = getResultParam(target);
-    addInstruction(load);
-}
-
-void InstructionSelection::setProperty(IR::Expr *source, IR::Expr *targetBase,
-                                       const QString &targetName)
-{
-    if (useFastLookups) {
-        Instruction::SetLookup store;
-        store.base = getParam(targetBase);
-        store.index = registerSetterLookup(targetName);
-        store.source = getParam(source);
-        addInstruction(store);
-        return;
-    }
-    Instruction::StoreProperty store;
-    store.base = getParam(targetBase);
-    store.name = registerString(targetName);
-    store.source = getParam(source);
-    addInstruction(store);
-}
-
-void InstructionSelection::setQmlContextProperty(IR::Expr *source, IR::Expr *targetBase, IR::Member::MemberKind kind, int propertyIndex)
-{
-    if (kind == IR::Member::MemberOfQmlScopeObject) {
-        Instruction::StoreScopeObjectProperty store;
-        store.base = getParam(targetBase);
-        store.propertyIndex = propertyIndex;
-        store.source = getParam(source);
-        addInstruction(store);
-    } else if (kind == IR::Member::MemberOfQmlContextObject) {
-        Instruction::StoreContextObjectProperty store;
-        store.base = getParam(targetBase);
-        store.propertyIndex = propertyIndex;
-        store.source = getParam(source);
-        addInstruction(store);
-    } else {
-        Q_ASSERT(false);
-    }
-}
-
-void InstructionSelection::setQObjectProperty(IR::Expr *source, IR::Expr *targetBase, int propertyIndex)
-{
-    Instruction::StoreQObjectProperty store;
-    store.base = getParam(targetBase);
-    store.propertyIndex = propertyIndex;
-    store.source = getParam(source);
-    addInstruction(store);
-}
-
-void InstructionSelection::getQmlContextProperty(IR::Expr *source, IR::Member::MemberKind kind, int index, bool captureRequired, IR::Expr *target)
-{
-    if (kind == IR::Member::MemberOfQmlScopeObject) {
-        Instruction::LoadScopeObjectProperty load;
-        load.base = getParam(source);
-        load.propertyIndex = index;
-        load.captureRequired = captureRequired;
-        load.result = getResultParam(target);
-        addInstruction(load);
-    } else if (kind == IR::Member::MemberOfQmlContextObject) {
-        Instruction::LoadContextObjectProperty load;
-        load.base = getParam(source);
-        load.propertyIndex = index;
-        load.captureRequired = captureRequired;
-        load.result = getResultParam(target);
-        addInstruction(load);
-    } else if (kind == IR::Member::MemberOfIdObjectsArray) {
-        Instruction::LoadIdObject load;
-        load.base = getParam(source);
-        load.index = index;
-        load.result = getResultParam(target);
-        addInstruction(load);
-    } else {
-        Q_ASSERT(false);
-    }
-}
-
-void InstructionSelection::getQObjectProperty(IR::Expr *base, int propertyIndex, bool captureRequired, bool isSingletonProperty, int attachedPropertiesId, IR::Expr *target)
-{
-    if (attachedPropertiesId != 0) {
-        Instruction::LoadAttachedQObjectProperty load;
-        load.propertyIndex = propertyIndex;
-        load.result = getResultParam(target);
-        load.attachedPropertiesId = attachedPropertiesId;
-        addInstruction(load);
-    } else if (isSingletonProperty) {
-        Instruction::LoadSingletonQObjectProperty load;
-        load.base = getParam(base);
-        load.propertyIndex = propertyIndex;
-        load.result = getResultParam(target);
-        load.captureRequired = captureRequired;
-        addInstruction(load);
-    } else {
-        Instruction::LoadQObjectProperty load;
-        load.base = getParam(base);
-        load.propertyIndex = propertyIndex;
-        load.result = getResultParam(target);
-        load.captureRequired = captureRequired;
-        addInstruction(load);
-    }
-}
-
-void InstructionSelection::getElement(IR::Expr *base, IR::Expr *index, IR::Expr *target)
-{
-    if (0 && useFastLookups) {
-        Instruction::LoadElementLookup load;
-        load.lookup = registerIndexedGetterLookup();
-        load.base = getParam(base);
-        load.index = getParam(index);
-        load.result = getResultParam(target);
-        addInstruction(load);
-        return;
-    }
-    Instruction::LoadElement load;
-    load.base = getParam(base);
-    load.index = getParam(index);
-    load.result = getResultParam(target);
-    addInstruction(load);
-}
-
-void InstructionSelection::setElement(IR::Expr *source, IR::Expr *targetBase,
-                                      IR::Expr *targetIndex)
-{
-    if (0 && useFastLookups) {
-        Instruction::StoreElementLookup store;
-        store.lookup = registerIndexedSetterLookup();
-        store.base = getParam(targetBase);
-        store.index = getParam(targetIndex);
-        store.source = getParam(source);
-        addInstruction(store);
-        return;
-    }
-    Instruction::StoreElement store;
-    store.base = getParam(targetBase);
-    store.index = getParam(targetIndex);
-    store.source = getParam(source);
-    addInstruction(store);
-}
-
-void InstructionSelection::copyValue(IR::Expr *source, IR::Expr *target)
-{
-    Instruction::Move move;
-    move.source = getParam(source);
-    move.result = getResultParam(target);
-    if (move.source != move.result)
-        addInstruction(move);
-}
-
-void InstructionSelection::swapValues(IR::Expr *source, IR::Expr *target)
-{
-    Instruction::SwapTemps swap;
-    swap.left = getParam(source);
-    swap.right = getParam(target);
-    addInstruction(swap);
-}
-
-void InstructionSelection::unop(IR::AluOp oper, IR::Expr *source, IR::Expr *target)
-{
-    switch (oper) {
-    case IR::OpIfTrue:
-        Q_ASSERT(!"unreachable"); break;
-    case IR::OpNot: {
-        // ### enabling this fails in some cases, where apparently the value is not a bool at runtime
-        if (0 && isBoolType(source)) {
-            Instruction::UNotBool unot;
-            unot.source = getParam(source);
-            unot.result = getResultParam(target);
-            addInstruction(unot);
-            return;
-        }
-        Instruction::UNot unot;
-        unot.source = getParam(source);
-        unot.result = getResultParam(target);
-        addInstruction(unot);
-        return;
-    }
-    case IR::OpUMinus: {
-        Instruction::UMinus uminus;
-        uminus.source = getParam(source);
-        uminus.result = getResultParam(target);
-        addInstruction(uminus);
-        return;
-    }
-    case IR::OpUPlus: {
-        if (isNumberType(source)) {
-            // use a move
-            Instruction::Move move;
-            move.source = getParam(source);
-            move.result = getResultParam(target);
-            if (move.source != move.result)
-                addInstruction(move);
-            return;
-        }
-        Instruction::UPlus uplus;
-        uplus.source = getParam(source);
-        uplus.result = getResultParam(target);
-        addInstruction(uplus);
-        return;
-    }
-    case IR::OpCompl: {
-        // ### enabling this fails in some cases, where apparently the value is not a int at runtime
-        if (0 && isIntegerType(source)) {
-            Instruction::UComplInt unot;
-            unot.source = getParam(source);
-            unot.result = getResultParam(target);
-            addInstruction(unot);
-            return;
-        }
-        Instruction::UCompl ucompl;
-        ucompl.source = getParam(source);
-        ucompl.result = getResultParam(target);
-        addInstruction(ucompl);
-        return;
-    }
-    case IR::OpIncrement: {
-        Instruction::Increment inc;
-        inc.source = getParam(source);
-        inc.result = getResultParam(target);
-        addInstruction(inc);
-        return;
-    }
-    case IR::OpDecrement: {
-        Instruction::Decrement dec;
-        dec.source = getParam(source);
-        dec.result = getResultParam(target);
-        addInstruction(dec);
-        return;
-    }
-    default:  break;
-    } // switch
-
-    Q_ASSERT(!"unreachable");
-}
-
-void InstructionSelection::binop(IR::AluOp oper, IR::Expr *leftSource, IR::Expr *rightSource, IR::Expr *target)
-{
-    binopHelper(oper, leftSource, rightSource, target);
-}
-
-Param InstructionSelection::binopHelper(IR::AluOp oper, IR::Expr *leftSource, IR::Expr *rightSource, IR::Expr *target)
-{
-    if (oper == IR::OpAdd) {
-        Instruction::Add add;
-        add.lhs = getParam(leftSource);
-        add.rhs = getParam(rightSource);
-        add.result = getResultParam(target);
-        addInstruction(add);
-        return add.result;
-    }
-    if (oper == IR::OpSub) {
-        Instruction::Sub sub;
-        sub.lhs = getParam(leftSource);
-        sub.rhs = getParam(rightSource);
-        sub.result = getResultParam(target);
-        addInstruction(sub);
-        return sub.result;
-    }
-    if (oper == IR::OpMul) {
-        Instruction::Mul mul;
-        mul.lhs = getParam(leftSource);
-        mul.rhs = getParam(rightSource);
-        mul.result = getResultParam(target);
-        addInstruction(mul);
-        return mul.result;
-    }
-    if (oper == IR::OpBitAnd) {
-        if (leftSource->asConst())
-            qSwap(leftSource, rightSource);
-        if (IR::Const *c = rightSource->asConst()) {
-            Instruction::BitAndConst bitAnd;
-            bitAnd.lhs = getParam(leftSource);
-            bitAnd.rhs = convertToValue(c).Value::toInt32();
-            bitAnd.result = getResultParam(target);
-            addInstruction(bitAnd);
-            return bitAnd.result;
-        }
-        Instruction::BitAnd bitAnd;
-        bitAnd.lhs = getParam(leftSource);
-        bitAnd.rhs = getParam(rightSource);
-        bitAnd.result = getResultParam(target);
-        addInstruction(bitAnd);
-        return bitAnd.result;
-    }
-    if (oper == IR::OpBitOr) {
-        if (leftSource->asConst())
-            qSwap(leftSource, rightSource);
-        if (IR::Const *c = rightSource->asConst()) {
-            Instruction::BitOrConst bitOr;
-            bitOr.lhs = getParam(leftSource);
-            bitOr.rhs = convertToValue(c).Value::toInt32();
-            bitOr.result = getResultParam(target);
-            addInstruction(bitOr);
-            return bitOr.result;
-        }
-        Instruction::BitOr bitOr;
-        bitOr.lhs = getParam(leftSource);
-        bitOr.rhs = getParam(rightSource);
-        bitOr.result = getResultParam(target);
-        addInstruction(bitOr);
-        return bitOr.result;
-    }
-    if (oper == IR::OpBitXor) {
-        if (leftSource->asConst())
-            qSwap(leftSource, rightSource);
-        if (IR::Const *c = rightSource->asConst()) {
-            Instruction::BitXorConst bitXor;
-            bitXor.lhs = getParam(leftSource);
-            bitXor.rhs = convertToValue(c).Value::toInt32();
-            bitXor.result = getResultParam(target);
-            addInstruction(bitXor);
-            return bitXor.result;
-        }
-        Instruction::BitXor bitXor;
-        bitXor.lhs = getParam(leftSource);
-        bitXor.rhs = getParam(rightSource);
-        bitXor.result = getResultParam(target);
-        addInstruction(bitXor);
-        return bitXor.result;
-    }
-    if (oper == IR::OpRShift) {
-        if (IR::Const *c = rightSource->asConst()) {
-            Instruction::ShrConst shr;
-            shr.lhs = getParam(leftSource);
-            shr.rhs = convertToValue(c).Value::toInt32() & 0x1f;
-            shr.result = getResultParam(target);
-            addInstruction(shr);
-            return shr.result;
-        }
-        Instruction::Shr shr;
-        shr.lhs = getParam(leftSource);
-        shr.rhs = getParam(rightSource);
-        shr.result = getResultParam(target);
-        addInstruction(shr);
-        return shr.result;
-    }
-    if (oper == IR::OpLShift) {
-        if (IR::Const *c = rightSource->asConst()) {
-            Instruction::ShlConst shl;
-            shl.lhs = getParam(leftSource);
-            shl.rhs = convertToValue(c).Value::toInt32() & 0x1f;
-            shl.result = getResultParam(target);
-            addInstruction(shl);
-            return shl.result;
-        }
-        Instruction::Shl shl;
-        shl.lhs = getParam(leftSource);
-        shl.rhs = getParam(rightSource);
-        shl.result = getResultParam(target);
-        addInstruction(shl);
-        return shl.result;
-    }
-
-    if (oper == IR::OpInstanceof || oper == IR::OpIn || oper == IR::OpAdd) {
-        Instruction::BinopContext binop;
-        if (oper == IR::OpInstanceof)
-            binop.alu = QV4::Runtime::instanceof;
-        else if (oper == IR::OpIn)
-            binop.alu = QV4::Runtime::in;
-        else
-            binop.alu = QV4::Runtime::add;
-        binop.lhs = getParam(leftSource);
-        binop.rhs = getParam(rightSource);
-        binop.result = getResultParam(target);
-        Q_ASSERT(binop.alu != QV4::Runtime::InvalidRuntimeMethod);
-        addInstruction(binop);
-        return binop.result;
-    } else {
-        auto binopFunc = aluOpFunction(oper);
-        Q_ASSERT(binopFunc != QV4::Runtime::InvalidRuntimeMethod);
-        Instruction::Binop binop;
-        binop.alu = binopFunc;
-        binop.lhs = getParam(leftSource);
-        binop.rhs = getParam(rightSource);
-        binop.result = getResultParam(target);
-        addInstruction(binop);
-        return binop.result;
-    }
-}
-
-void InstructionSelection::prepareCallArgs(IR::ExprList *e, quint32 &argc, quint32 *args)
-{
-    int argLocation = outgoingArgumentTempStart();
-    argc = 0;
-    if (args)
-        *args = argLocation;
-    if (e) {
-        // We need to move all the temps into the function arg array
-        Q_ASSERT(argLocation >= 0);
-        while (e) {
-            if (IR::Const *c = e->expr->asConst()) {
-                Instruction::MoveConst move;
-                move.source = convertToValue(c).asReturnedValue();
-                move.result = Param::createTemp(argLocation);
-                addInstruction(move);
-            } else {
-                Instruction::Move move;
-                move.source = getParam(e->expr);
-                move.result = Param::createTemp(argLocation);
-                addInstruction(move);
-            }
-            ++argLocation;
-            ++argc;
-            e = e->next;
-        }
-    }
-}
-
-void InstructionSelection::addDebugInstruction()
-{
-#if QT_CONFIG(qml_debug)
-    if (blockNeedsDebugInstruction) {
-        Instruction::Debug debug;
-        debug.lineNumber = -int(currentLine);
-        addInstruction(debug);
-    }
-#endif
-}
-
-void InstructionSelection::visitJump(IR::Jump *s)
-{
-    if (s->target == _nextBlock)
-        return;
-    if (_removableJumps.at(_block->index()))
-        return;
-
-    addDebugInstruction();
-
-    Instruction::Jump jump;
-    jump.offset = 0;
-    ptrdiff_t loc = addInstruction(jump) + (((const char *)&jump.offset) - ((const char *)&jump));
-
-    _patches[s->target].append(loc);
-}
-
-void InstructionSelection::visitCJump(IR::CJump *s)
-{
-    addDebugInstruction();
-
-    Param condition;
-    if (IR::Temp *t = s->cond->asTemp()) {
-        condition = getResultParam(t);
-    } else if (IR::Binop *b = s->cond->asBinop()) {
-        condition = binopHelper(b->op, b->left, b->right, /*target*/0);
-    } else {
-        Q_UNIMPLEMENTED();
-    }
-
-    if (s->iftrue == _nextBlock) {
-        Instruction::JumpNe jump;
-        jump.offset = 0;
-        jump.condition = condition;
-        ptrdiff_t falseLoc = addInstruction(jump) + (((const char *)&jump.offset) - ((const char *)&jump));
-        _patches[s->iffalse].append(falseLoc);
-    } else {
-        Instruction::JumpEq jump;
-        jump.offset = 0;
-        jump.condition = condition;
-        ptrdiff_t trueLoc = addInstruction(jump) + (((const char *)&jump.offset) - ((const char *)&jump));
-        _patches[s->iftrue].append(trueLoc);
-
-        if (s->iffalse != _nextBlock) {
-            Instruction::Jump jump;
-            jump.offset = 0;
-            ptrdiff_t falseLoc = addInstruction(jump) + (((const char *)&jump.offset) - ((const char *)&jump));
-            _patches[s->iffalse].append(falseLoc);
-        }
-    }
-}
-
-void InstructionSelection::visitRet(IR::Ret *s)
-{
-    // this is required so stepOut will always be guaranteed to stop in every stack frame
-    addDebugInstruction();
-
-    Instruction::Ret ret;
-    ret.result = getParam(s->expr);
-    addInstruction(ret);
-}
-
-void InstructionSelection::callBuiltinInvalid(IR::Name *func, IR::ExprList *args, IR::Expr *result)
-{
-    if (useFastLookups && func->global) {
-        Instruction::CallGlobalLookup call;
-        call.index = registerGlobalGetterLookup(*func->id);
-        prepareCallArgs(args, call.argc);
-        call.callData = callDataStart();
-        call.result = getResultParam(result);
-        addInstruction(call);
-        return;
-    }
-    Instruction::CallActivationProperty call;
-    call.name = registerString(*func->id);
-    prepareCallArgs(args, call.argc);
-    call.callData = callDataStart();
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinTypeofQmlContextProperty(IR::Expr *base, IR::Member::MemberKind kind, int propertyIndex, IR::Expr *result)
-{
-    if (kind == IR::Member::MemberOfQmlScopeObject) {
-        Instruction::CallBuiltinTypeofScopeObjectProperty call;
-        call.base = getParam(base);
-        call.index = propertyIndex;
-        call.result = getResultParam(result);
-        addInstruction(call);
-    } else if (kind == IR::Member::MemberOfQmlContextObject) {
-        Instruction::CallBuiltinTypeofContextObjectProperty call;
-        call.base = getParam(base);
-        call.index = propertyIndex;
-        call.result = getResultParam(result);
-        addInstruction(call);
-    } else {
-        Q_UNREACHABLE();
-    }
-}
-
-void InstructionSelection::callBuiltinTypeofMember(IR::Expr *base, const QString &name,
-                                                   IR::Expr *result)
-{
-    Instruction::CallBuiltinTypeofMember call;
-    call.base = getParam(base);
-    call.member = registerString(name);
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinTypeofSubscript(IR::Expr *base, IR::Expr *index,
-                                                      IR::Expr *result)
-{
-    Instruction::CallBuiltinTypeofSubscript call;
-    call.base = getParam(base);
-    call.index = getParam(index);
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinTypeofName(const QString &name, IR::Expr *result)
-{
-    Instruction::CallBuiltinTypeofName call;
-    call.name = registerString(name);
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinTypeofValue(IR::Expr *value, IR::Expr *result)
-{
-    Instruction::CallBuiltinTypeofValue call;
-    call.value = getParam(value);
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinDeleteMember(IR::Expr *base, const QString &name, IR::Expr *result)
-{
-    Instruction::CallBuiltinDeleteMember call;
-    call.base = getParam(base);
-    call.member = registerString(name);
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinDeleteSubscript(IR::Expr *base, IR::Expr *index,
-                                                      IR::Expr *result)
-{
-    Instruction::CallBuiltinDeleteSubscript call;
-    call.base = getParam(base);
-    call.index = getParam(index);
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinDeleteName(const QString &name, IR::Expr *result)
-{
-    Instruction::CallBuiltinDeleteName call;
-    call.name = registerString(name);
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinDeleteValue(IR::Expr *result)
-{
-    Instruction::MoveConst move;
-    move.source = QV4::Encode(false);
-    move.result = getResultParam(result);
-    addInstruction(move);
-}
-
-void InstructionSelection::callBuiltinThrow(IR::Expr *arg)
-{
-    Instruction::CallBuiltinThrow call;
-    call.arg = getParam(arg);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinReThrow()
-{
-    if (_block->catchBlock) {
-        // jump to exception handler
-        Instruction::Jump jump;
-        jump.offset = 0;
-        ptrdiff_t loc = addInstruction(jump) + (((const char *)&jump.offset) - ((const char *)&jump));
-
-        _patches[_block->catchBlock].append(loc);
-    } else {
-        Instruction::Ret ret;
-        int idx = jsUnitGenerator()->registerConstant(QV4::Encode::undefined());
-        ret.result = Param::createConstant(idx);
-        addInstruction(ret);
-    }
-}
-
-void InstructionSelection::callBuiltinUnwindException(IR::Expr *result)
-{
-    Instruction::CallBuiltinUnwindException call;
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-
-void InstructionSelection::callBuiltinPushCatchScope(const QString &exceptionName)
-{
-    Instruction::CallBuiltinPushCatchScope call;
-    call.name = registerString(exceptionName);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinForeachIteratorObject(IR::Expr *arg, IR::Expr *result)
-{
-    Instruction::CallBuiltinForeachIteratorObject call;
-    call.arg = getParam(arg);
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinForeachNextPropertyname(IR::Expr *arg, IR::Expr *result)
-{
-    Instruction::CallBuiltinForeachNextPropertyName call;
-    call.arg = getParam(arg);
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinPushWithScope(IR::Expr *arg)
-{
-    Instruction::CallBuiltinPushScope call;
-    call.arg = getParam(arg);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinPopScope()
-{
-    QT_WARNING_PUSH
-    QT_WARNING_DISABLE_GCC("-Wuninitialized")
-    Instruction::CallBuiltinPopScope call;
-    addInstruction(call);
-    QT_WARNING_POP
-}
-
-void InstructionSelection::callBuiltinDeclareVar(bool deletable, const QString &name)
-{
-    Instruction::CallBuiltinDeclareVar call;
-    call.isDeletable = deletable;
-    call.varName = registerString(name);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinDefineArray(IR::Expr *result, IR::ExprList *args)
-{
-    Instruction::CallBuiltinDefineArray call;
-    prepareCallArgs(args, call.argc, &call.args);
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinDefineObjectLiteral(IR::Expr *result, int keyValuePairCount, IR::ExprList *keyValuePairs, IR::ExprList *arrayEntries, bool needSparseArray)
-{
-    int argLocation = outgoingArgumentTempStart();
-
-    const int classId = registerJSClass(keyValuePairCount, keyValuePairs);
-
-    // Process key/value pairs first
-    IR::ExprList *it = keyValuePairs;
-    for (int i = 0; i < keyValuePairCount; ++i, it = it->next) {
-        // Skip name
-        it = it->next;
-
-        bool isData = it->expr->asConst()->value;
-        it = it->next;
-
-        if (IR::Const *c = it->expr->asConst()) {
-            Instruction::MoveConst move;
-            move.source = convertToValue(c).asReturnedValue();
-            move.result = Param::createTemp(argLocation);
-            addInstruction(move);
-        } else {
-            Instruction::Move move;
-            move.source = getParam(it->expr);
-            move.result = Param::createTemp(argLocation);
-            addInstruction(move);
-        }
-        ++argLocation;
-
-        if (!isData) {
-            it = it->next;
-
-            Instruction::Move move;
-            move.source = getParam(it->expr);
-            move.result = Param::createTemp(argLocation);
-            addInstruction(move);
-            ++argLocation;
-        }
-    }
-
-    // Process array values
-    uint arrayValueCount = 0;
-    it = arrayEntries;
-    while (it) {
-        IR::Const *index = it->expr->asConst();
-        it = it->next;
-
-        bool isData = it->expr->asConst()->value;
-        it = it->next;
-
-        if (!isData) {
-            it = it->next; // getter
-            it = it->next; // setter
-            continue;
-        }
-
-        ++arrayValueCount;
-
-        Instruction::MoveConst indexMove;
-        indexMove.source = convertToValue(index).asReturnedValue();
-        indexMove.result = Param::createTemp(argLocation);
-        addInstruction(indexMove);
-        ++argLocation;
-
-        Instruction::Move move;
-        move.source = getParam(it->expr);
-        move.result = Param::createTemp(argLocation);
-        addInstruction(move);
-        ++argLocation;
-        it = it->next;
-    }
-
-    // Process array getter/setter pairs
-    uint arrayGetterSetterCount = 0;
-    it = arrayEntries;
-    while (it) {
-        IR::Const *index = it->expr->asConst();
-        it = it->next;
-
-        bool isData = it->expr->asConst()->value;
-        it = it->next;
-
-        if (isData) {
-            it = it->next; // value
-            continue;
-        }
-
-        ++arrayGetterSetterCount;
-
-        Instruction::MoveConst indexMove;
-        indexMove.source = convertToValue(index).asReturnedValue();
-        indexMove.result = Param::createTemp(argLocation);
-        addInstruction(indexMove);
-        ++argLocation;
-
-        // getter
-        Instruction::Move moveGetter;
-        moveGetter.source = getParam(it->expr);
-        moveGetter.result = Param::createTemp(argLocation);
-        addInstruction(moveGetter);
-        ++argLocation;
-        it = it->next;
-
-        // setter
-        Instruction::Move moveSetter;
-        moveSetter.source = getParam(it->expr);
-        moveSetter.result = Param::createTemp(argLocation);
-        addInstruction(moveSetter);
-        ++argLocation;
-        it = it->next;
-    }
-
-    Instruction::CallBuiltinDefineObjectLiteral call;
-    call.internalClassId = classId;
-    call.arrayValueCount = arrayValueCount;
-    call.arrayGetterSetterCountAndFlags = arrayGetterSetterCount | (needSparseArray << 30);
-    call.args = outgoingArgumentTempStart();
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-void InstructionSelection::callBuiltinSetupArgumentObject(IR::Expr *result)
-{
-    Instruction::CallBuiltinSetupArgumentsObject call;
-    call.result = getResultParam(result);
-    addInstruction(call);
-}
-
-
-void QV4::Moth::InstructionSelection::callBuiltinConvertThisToObject()
-{
-    QT_WARNING_PUSH
-    QT_WARNING_DISABLE_GCC("-Wuninitialized")
-    Instruction::CallBuiltinConvertThisToObject call;
-    addInstruction(call);
-    QT_WARNING_POP
-}
-
-ptrdiff_t InstructionSelection::addInstructionHelper(Instr::Type type, Instr &instr)
-{
-    instr.common.instructionType = type;
-
-    int instructionSize = Instr::size(type);
-    if (_codeEnd - _codeNext < instructionSize) {
-        int currSize = _codeEnd - _codeStart;
-        uchar *newCode = new uchar[currSize * 2];
-        ::memset(newCode + currSize, 0, currSize);
-        ::memcpy(newCode, _codeStart, currSize);
-        _codeNext = _codeNext - _codeStart + newCode;
-        delete[] _codeStart;
-        _codeStart = newCode;
-        _codeEnd = _codeStart + currSize * 2;
-    }
-
-    ::memcpy(_codeNext, reinterpret_cast<const char *>(&instr), instructionSize);
-    ptrdiff_t ptrOffset = _codeNext - _codeStart;
-    _codeNext += instructionSize;
-
-    return ptrOffset;
-}
-
-void InstructionSelection::patchJumpAddresses()
-{
-    typedef QHash<IR::BasicBlock *, QVector<ptrdiff_t> >::ConstIterator PatchIt;
-    for (PatchIt i = _patches.cbegin(), ei = _patches.cend(); i != ei; ++i) {
-        Q_ASSERT(_addrs.contains(i.key()));
-        ptrdiff_t target = _addrs.value(i.key());
-
-        const QVector<ptrdiff_t> &patchList = i.value();
-        for (int ii = 0, eii = patchList.count(); ii < eii; ++ii) {
-            ptrdiff_t patch = patchList.at(ii);
-
-            *((ptrdiff_t *)(_codeStart + patch)) = target - patch;
-        }
-    }
-
-    _patches.clear();
-    _addrs.clear();
-}
-
-QByteArray InstructionSelection::squeezeCode() const
-{
-    int codeSize = _codeNext - _codeStart;
-    QByteArray squeezed;
-    squeezed.resize(codeSize);
-    ::memcpy(squeezed.data(), _codeStart, codeSize);
-    return squeezed;
-}
-
-Param InstructionSelection::getParam(IR::Expr *e) {
-    Q_ASSERT(e);
-
-    if (IR::Const *c = e->asConst()) {
-        int idx = jsUnitGenerator()->registerConstant(convertToValue(c).asReturnedValue());
-        return Param::createConstant(idx);
-    } else if (IR::Temp *t = e->asTemp()) {
-        switch (t->kind) {
-        case IR::Temp::StackSlot:
-            return Param::createTemp(t->index);
-        default:
-            Q_UNREACHABLE();
-            return Param();
-        }
-    } else if (IR::ArgLocal *al = e->asArgLocal()) {
-        switch (al->kind) {
-        case IR::ArgLocal::Formal:
-        case IR::ArgLocal::ScopedFormal: return Param::createArgument(al->index, al->scope);
-        case IR::ArgLocal::Local: return Param::createLocal(al->index);
-        case IR::ArgLocal::ScopedLocal: return Param::createScopedLocal(al->index, al->scope);
-        default:
-            Q_UNREACHABLE();
-            return Param();
-        }
-    } else {
-        Q_UNIMPLEMENTED();
-        return Param();
-    }
-}
-
-
-CompilationUnit::~CompilationUnit()
-{
-}
-
-#if !defined(V4_BOOTSTRAP)
-
-void CompilationUnit::linkBackendToEngine(QV4::ExecutionEngine *engine)
-{
-    runtimeFunctions.resize(data->functionTableSize);
-    runtimeFunctions.fill(0);
-    for (int i = 0 ;i < runtimeFunctions.size(); ++i) {
-        const QV4::CompiledData::Function *compiledFunction = data->functionAt(i);
-
-        QV4::Function *runtimeFunction = new QV4::Function(engine, this, compiledFunction, &VME::exec);
-        runtimeFunction->codeData = reinterpret_cast<const uchar *>(codeRefs.at(i).constData());
-        runtimeFunctions[i] = runtimeFunction;
-    }
-}
-
-bool CompilationUnit::memoryMapCode(QString *errorString)
-{
-    Q_UNUSED(errorString);
-    codeRefs.resize(data->functionTableSize);
-
-    const char *basePtr = reinterpret_cast<const char *>(data);
-
-    for (uint i = 0; i < data->functionTableSize; ++i) {
-        const CompiledData::Function *compiledFunction = data->functionAt(i);
-        const char *codePtr = const_cast<const char *>(reinterpret_cast<const char *>(basePtr + compiledFunction->codeOffset));
-        QByteArray code = QByteArray::fromRawData(codePtr, compiledFunction->codeSize);
-        codeRefs[i] = code;
-    }
-
-    return true;
-}
-
-#endif // V4_BOOTSTRAP
-
-void CompilationUnit::prepareCodeOffsetsForDiskStorage(CompiledData::Unit *unit)
-{
-    const int codeAlignment = 16;
-    quint64 offset = WTF::roundUpToMultipleOf(codeAlignment, unit->unitSize);
-    Q_ASSERT(int(unit->functionTableSize) == codeRefs.size());
-    for (int i = 0; i < codeRefs.size(); ++i) {
-        CompiledData::Function *compiledFunction = const_cast<CompiledData::Function *>(unit->functionAt(i));
-        compiledFunction->codeOffset = offset;
-        compiledFunction->codeSize = codeRefs.at(i).size();
-        offset = WTF::roundUpToMultipleOf(codeAlignment, offset + compiledFunction->codeSize);
-    }
-}
-
-bool CompilationUnit::saveCodeToDisk(QIODevice *device, const CompiledData::Unit *unit, QString *errorString)
-{
-    Q_ASSERT(device->pos() == unit->unitSize);
-    Q_ASSERT(device->atEnd());
-    Q_ASSERT(int(unit->functionTableSize) == codeRefs.size());
-
-    QByteArray padding;
-
-    for (int i = 0; i < codeRefs.size(); ++i) {
-        const CompiledData::Function *compiledFunction = unit->functionAt(i);
-
-        if (device->pos() > qint64(compiledFunction->codeOffset)) {
-            *errorString = QStringLiteral("Invalid state of cache file to write.");
-            return false;
-        }
-
-        const quint64 paddingSize = compiledFunction->codeOffset - device->pos();
-        padding.fill(0, paddingSize);
-        qint64 written = device->write(padding);
-        if (written != padding.size()) {
-            *errorString = device->errorString();
-            return false;
-        }
-
-        QByteArray code = codeRefs.at(i);
-
-        written = device->write(code.constData(), compiledFunction->codeSize);
-        if (written != qint64(compiledFunction->codeSize)) {
-            *errorString = device->errorString();
-            return false;
-        }
-    }
-    return true;
-}
-
-QQmlRefPointer<CompiledData::CompilationUnit> ISelFactory::createUnitForLoading()
-{
-    QQmlRefPointer<CompiledData::CompilationUnit> result;
-    result.adopt(new Moth::CompilationUnit);
-    return result;
-}
diff --git a/src/qml/compiler/qv4isel_moth_p.h b/src/qml/compiler/qv4isel_moth_p.h
deleted file mode 100644
index db49177783..0000000000
--- a/src/qml/compiler/qv4isel_moth_p.h
+++ /dev/null
@@ -1,240 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QV4ISEL_MOTH_P_H
-#define QV4ISEL_MOTH_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include <private/qv4global_p.h>
-#include <private/qv4isel_p.h>
-#include <private/qv4isel_util_p.h>
-#include <private/qv4util_p.h>
-#include <private/qv4jsir_p.h>
-#include <private/qv4value_p.h>
-#include "qv4instr_moth_p.h"
-
-#if !defined(V4_BOOTSTRAP)
-QT_REQUIRE_CONFIG(qml_interpreter);
-#endif
-
-QT_BEGIN_NAMESPACE
-
-namespace QV4 {
-namespace Moth {
-
-struct CompilationUnit : public QV4::CompiledData::CompilationUnit
-{
-    virtual ~CompilationUnit();
-#if !defined(V4_BOOTSTRAP)
-    void linkBackendToEngine(QV4::ExecutionEngine *engine) override;
-    bool memoryMapCode(QString *errorString) override;
-#endif
-    void prepareCodeOffsetsForDiskStorage(CompiledData::Unit *unit) override;
-    bool saveCodeToDisk(QIODevice *device, const CompiledData::Unit *unit, QString *errorString) override;
-
-    QVector<QByteArray> codeRefs;
-
-};
-
-class Q_QML_EXPORT InstructionSelection:
-        public IR::IRDecoder,
-        public EvalInstructionSelection
-{
-public:
-    InstructionSelection(QQmlEnginePrivate *qmlEngine, QV4::ExecutableAllocator *execAllocator, IR::Module *module, QV4::Compiler::JSUnitGenerator *jsGenerator, EvalISelFactory *iselFactory);
-    ~InstructionSelection();
-
-    void run(int functionIndex) override;
-
-protected:
-    QQmlRefPointer<CompiledData::CompilationUnit> backendCompileStep() override;
-
-    void visitJump(IR::Jump *) override;
-    void visitCJump(IR::CJump *) override;
-    void visitRet(IR::Ret *) override;
-
-    void callBuiltinInvalid(IR::Name *func, IR::ExprList *args, IR::Expr *result) override;
-    void callBuiltinTypeofQmlContextProperty(IR::Expr *base, IR::Member::MemberKind kind, int propertyIndex, IR::Expr *result) override;
-    void callBuiltinTypeofMember(IR::Expr *base, const QString &name, IR::Expr *result) override;
-    void callBuiltinTypeofSubscript(IR::Expr *base, IR::Expr *index, IR::Expr *result) override;
-    void callBuiltinTypeofName(const QString &name, IR::Expr *result) override;
-    void callBuiltinTypeofValue(IR::Expr *value, IR::Expr *result) override;
-    void callBuiltinDeleteMember(IR::Expr *base, const QString &name, IR::Expr *result) override;
-    void callBuiltinDeleteSubscript(IR::Expr *base, IR::Expr *index, IR::Expr *result) override;
-    void callBuiltinDeleteName(const QString &name, IR::Expr *result) override;
-    void callBuiltinDeleteValue(IR::Expr *result) override;
-    void callBuiltinThrow(IR::Expr *arg) override;
-    void callBuiltinReThrow() override;
-    void callBuiltinUnwindException(IR::Expr *) override;
-    void callBuiltinPushCatchScope(const QString &exceptionName) override;
-    void callBuiltinForeachIteratorObject(IR::Expr *arg, IR::Expr *result) override;
-    void callBuiltinForeachNextPropertyname(IR::Expr *arg, IR::Expr *result) override;
-    void callBuiltinPushWithScope(IR::Expr *arg) override;
-    void callBuiltinPopScope() override;
-    void callBuiltinDeclareVar(bool deletable, const QString &name) override;
-    void callBuiltinDefineArray(IR::Expr *result, IR::ExprList *args) override;
-    void callBuiltinDefineObjectLiteral(IR::Expr *result, int keyValuePairCount, IR::ExprList *keyValuePairs, IR::ExprList *arrayEntries, bool needSparseArray) override;
-    void callBuiltinSetupArgumentObject(IR::Expr *result) override;
-    void callBuiltinConvertThisToObject() override;
-    void callValue(IR::Expr *value, IR::ExprList *args, IR::Expr *result) override;
-    void callQmlContextProperty(IR::Expr *base, IR::Member::MemberKind kind, int propertyIndex, IR::ExprList *args, IR::Expr *result) override;
-    void callProperty(IR::Expr *base, const QString &name, IR::ExprList *args, IR::Expr *result) override;
-    void callSubscript(IR::Expr *base, IR::Expr *index, IR::ExprList *args, IR::Expr *result) override;
-    void convertType(IR::Expr *source, IR::Expr *target) override;
-    void constructActivationProperty(IR::Name *func, IR::ExprList *args, IR::Expr *result) override;
-    void constructProperty(IR::Expr *base, const QString &name, IR::ExprList *args, IR::Expr *result) override;
-    void constructValue(IR::Expr *value, IR::ExprList *args, IR::Expr *result) override;
-    void loadThisObject(IR::Expr *e) override;
-    void loadQmlContext(IR::Expr *e) override;
-    void loadQmlImportedScripts(IR::Expr *e) override;
-    void loadQmlSingleton(const QString &name, IR::Expr *e) override;
-    void loadConst(IR::Const *sourceConst, IR::Expr *e) override;
-    void loadString(const QString &str, IR::Expr *target) override;
-    void loadRegexp(IR::RegExp *sourceRegexp, IR::Expr *target) override;
-    void getActivationProperty(const IR::Name *name, IR::Expr *target) override;
-    void setActivationProperty(IR::Expr *source, const QString &targetName) override;
-    void initClosure(IR::Closure *closure, IR::Expr *target) override;
-    void getProperty(IR::Expr *base, const QString &name, IR::Expr *target) override;
-    void setProperty(IR::Expr *source, IR::Expr *targetBase, const QString &targetName) override;
-    void setQmlContextProperty(IR::Expr *source, IR::Expr *targetBase, IR::Member::MemberKind kind, int propertyIndex) override;
-    void setQObjectProperty(IR::Expr *source, IR::Expr *targetBase, int propertyIndex) override;
-    void getQmlContextProperty(IR::Expr *source, IR::Member::MemberKind kind, int index, bool captureRequired, IR::Expr *target) override;
-    void getQObjectProperty(IR::Expr *base, int propertyIndex, bool captureRequired, bool isSingleton, int attachedPropertiesId, IR::Expr *target) override;
-    void getElement(IR::Expr *base, IR::Expr *index, IR::Expr *target) override;
-    void setElement(IR::Expr *source, IR::Expr *targetBase, IR::Expr *targetIndex) override;
-    void copyValue(IR::Expr *source, IR::Expr *target) override;
-    void swapValues(IR::Expr *source, IR::Expr *target) override;
-    void unop(IR::AluOp oper, IR::Expr *source, IR::Expr *target) override;
-    void binop(IR::AluOp oper, IR::Expr *leftSource, IR::Expr *rightSource, IR::Expr *target) override;
-
-private:
-    Param binopHelper(IR::AluOp oper, IR::Expr *leftSource, IR::Expr *rightSource, IR::Expr *target);
-
-    struct Instruction {
-#define MOTH_INSTR_DATA_TYPEDEF(I, FMT) typedef InstrData<Instr::I> I;
-    FOR_EACH_MOTH_INSTR(MOTH_INSTR_DATA_TYPEDEF)
-#undef MOTH_INSTR_DATA_TYPEDEF
-    private:
-        Instruction();
-    };
-
-    Param getParam(IR::Expr *e);
-
-    Param getResultParam(IR::Expr *result)
-    {
-        if (result)
-            return getParam(result);
-        else
-            return Param::createTemp(scratchTempIndex());
-    }
-
-    void simpleMove(IR::Move *);
-    void prepareCallArgs(IR::ExprList *, quint32 &, quint32 * = 0);
-
-    int scratchTempIndex() const { return _function->tempCount; }
-    int callDataStart() const { return scratchTempIndex() + 1; }
-    int outgoingArgumentTempStart() const { return callDataStart() + offsetof(QV4::CallData, args)/sizeof(QV4::Value); }
-    int frameSize() const { return outgoingArgumentTempStart() + _function->maxNumberOfArguments; }
-
-    template <int Instr>
-    inline ptrdiff_t addInstruction(const InstrData<Instr> &data);
-    inline void addDebugInstruction();
-
-    ptrdiff_t addInstructionHelper(Instr::Type type, Instr &instr);
-    void patchJumpAddresses();
-    QByteArray squeezeCode() const;
-
-    QQmlEnginePrivate *qmlEngine;
-
-    bool blockNeedsDebugInstruction;
-    uint currentLine;
-    IR::BasicBlock *_block;
-    IR::BasicBlock *_nextBlock;
-
-    QHash<IR::BasicBlock *, QVector<ptrdiff_t> > _patches;
-    QHash<IR::BasicBlock *, ptrdiff_t> _addrs;
-
-    uchar *_codeStart;
-    uchar *_codeNext;
-    uchar *_codeEnd;
-
-    BitVector _removableJumps;
-    IR::Stmt *_currentStatement;
-
-    QScopedPointer<CompilationUnit> compilationUnit;
-    QHash<IR::Function *, QByteArray> codeRefs;
-};
-
-class Q_QML_EXPORT ISelFactory: public EvalISelFactory
-{
-public:
-    ISelFactory() : EvalISelFactory(QStringLiteral("moth")) {}
-    virtual ~ISelFactory() {}
-    EvalInstructionSelection *create(QQmlEnginePrivate *qmlEngine, QV4::ExecutableAllocator *execAllocator, IR::Module *module, QV4::Compiler::JSUnitGenerator *jsGenerator) override final
-    { return new InstructionSelection(qmlEngine, execAllocator, module, jsGenerator, this); }
-    bool jitCompileRegexps() const override final
-    { return false; }
-    QQmlRefPointer<QV4::CompiledData::CompilationUnit> createUnitForLoading() override;
-
-};
-
-template<int InstrT>
-ptrdiff_t InstructionSelection::addInstruction(const InstrData<InstrT> &data)
-{
-    Instr genericInstr;
-    InstrMeta<InstrT>::setDataNoCommon(genericInstr, data);
-    return addInstructionHelper(static_cast<Instr::Type>(InstrT), genericInstr);
-}
-
-} // namespace Moth
-} // namespace QV4
-
-QT_END_NAMESPACE
-
-#endif // QV4ISEL_MOTH_P_H
diff --git a/src/qml/compiler/qv4isel_p.cpp b/src/qml/compiler/qv4isel_p.cpp
deleted file mode 100644
index efcfb9bd77..0000000000
--- a/src/qml/compiler/qv4isel_p.cpp
+++ /dev/null
@@ -1,446 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include <QtCore/QDebug>
-#include <QtCore/QBuffer>
-#include "qv4jsir_p.h"
-#include "qv4isel_p.h"
-#include "qv4isel_util_p.h"
-#include <private/qv4value_p.h>
-#ifndef V4_BOOTSTRAP
-#include <private/qqmlpropertycache_p.h>
-#endif
-
-#include <QString>
-
-using namespace QV4;
-using namespace QV4::IR;
-
-EvalInstructionSelection::EvalInstructionSelection(QV4::ExecutableAllocator *execAllocator, Module *module, QV4::Compiler::JSUnitGenerator *jsGenerator, EvalISelFactory *iselFactory)
-    : useFastLookups(true)
-    , useTypeInference(true)
-    , executableAllocator(execAllocator)
-    , irModule(module)
-{
-    if (!jsGenerator) {
-        jsGenerator = new QV4::Compiler::JSUnitGenerator(module);
-        ownJSGenerator.reset(jsGenerator);
-    }
-    this->jsGenerator = jsGenerator;
-#ifndef V4_BOOTSTRAP
-    Q_ASSERT(execAllocator);
-#endif
-    Q_ASSERT(module);
-    jsGenerator->codeGeneratorName = iselFactory->codeGeneratorName;
-}
-
-EvalInstructionSelection::~EvalInstructionSelection()
-{}
-
-EvalISelFactory::~EvalISelFactory()
-{}
-
-QQmlRefPointer<CompiledData::CompilationUnit> EvalInstructionSelection::compile(bool generateUnitData)
-{
-    for (int i = 0; i < irModule->functions.size(); ++i)
-        run(i);
-
-    QQmlRefPointer<QV4::CompiledData::CompilationUnit> unit = backendCompileStep();
-    if (generateUnitData)
-        unit->data = jsGenerator->generateUnit();
-    return unit;
-}
-
-void IRDecoder::visitMove(IR::Move *s)
-{
-    if (IR::Name *n = s->target->asName()) {
-        if (s->source->asTemp() || s->source->asConst() || s->source->asArgLocal()) {
-            setActivationProperty(s->source, *n->id);
-            return;
-        }
-    } else if (s->target->asTemp() || s->target->asArgLocal()) {
-        if (IR::Name *n = s->source->asName()) {
-            if (n->id && *n->id == QLatin1String("this")) // TODO: `this' should be a builtin.
-                loadThisObject(s->target);
-            else if (n->builtin == IR::Name::builtin_qml_context)
-                loadQmlContext(s->target);
-            else if (n->builtin == IR::Name::builtin_qml_imported_scripts_object)
-                loadQmlImportedScripts(s->target);
-            else if (n->qmlSingleton)
-                loadQmlSingleton(*n->id, s->target);
-            else
-                getActivationProperty(n, s->target);
-            return;
-        } else if (IR::Const *c = s->source->asConst()) {
-            loadConst(c, s->target);
-            return;
-        } else if (s->source->asTemp() || s->source->asArgLocal()) {
-            if (s->swap)
-                swapValues(s->source, s->target);
-            else
-                copyValue(s->source, s->target);
-            return;
-        } else if (IR::String *str = s->source->asString()) {
-            loadString(*str->value, s->target);
-            return;
-        } else if (IR::RegExp *re = s->source->asRegExp()) {
-            loadRegexp(re, s->target);
-            return;
-        } else if (IR::Closure *clos = s->source->asClosure()) {
-            initClosure(clos, s->target);
-            return;
-        } else if (IR::New *ctor = s->source->asNew()) {
-            if (Name *func = ctor->base->asName()) {
-                constructActivationProperty(func, ctor->args, s->target);
-                return;
-            } else if (IR::Member *member = ctor->base->asMember()) {
-                constructProperty(member->base, *member->name, ctor->args, s->target);
-                return;
-            } else if (ctor->base->asTemp() || ctor->base->asArgLocal()) {
-                constructValue(ctor->base, ctor->args, s->target);
-                return;
-            }
-        } else if (IR::Member *m = s->source->asMember()) {
-            if (m->property) {
-#ifdef V4_BOOTSTRAP
-                Q_UNIMPLEMENTED();
-#else
-                bool captureRequired = true;
-
-                Q_ASSERT(m->kind != IR::Member::MemberOfEnum && m->kind != IR::Member::MemberOfIdObjectsArray);
-                const int attachedPropertiesId = m->attachedPropertiesId;
-                const bool isSingletonProperty = m->kind == IR::Member::MemberOfSingletonObject;
-
-                if (_function && attachedPropertiesId == 0 && !m->property->isConstant() && _function->isQmlBinding) {
-                    if (m->kind == IR::Member::MemberOfQmlContextObject) {
-                        _function->contextObjectPropertyDependencies.insert(m->property->coreIndex(), m->property->notifyIndex());
-                        captureRequired = false;
-                    } else if (m->kind == IR::Member::MemberOfQmlScopeObject) {
-                        _function->scopeObjectPropertyDependencies.insert(m->property->coreIndex(), m->property->notifyIndex());
-                        captureRequired = false;
-                    }
-                }
-                if (m->kind == IR::Member::MemberOfQmlScopeObject || m->kind == IR::Member::MemberOfQmlContextObject) {
-                    getQmlContextProperty(m->base, (IR::Member::MemberKind)m->kind, m->property->coreIndex(), captureRequired, s->target);
-                    return;
-                }
-                getQObjectProperty(m->base, m->property->coreIndex(), captureRequired, isSingletonProperty, attachedPropertiesId, s->target);
-#endif // V4_BOOTSTRAP
-                return;
-            } else if (m->kind == IR::Member::MemberOfIdObjectsArray) {
-                getQmlContextProperty(m->base, (IR::Member::MemberKind)m->kind, m->idIndex, /*captureRequired*/false, s->target);
-                return;
-            } else if (m->base->asTemp() || m->base->asConst() || m->base->asArgLocal()) {
-                getProperty(m->base, *m->name, s->target);
-                return;
-            }
-        } else if (IR::Subscript *ss = s->source->asSubscript()) {
-            getElement(ss->base, ss->index, s->target);
-            return;
-        } else if (IR::Unop *u = s->source->asUnop()) {
-            unop(u->op, u->expr, s->target);
-            return;
-        } else if (IR::Binop *b = s->source->asBinop()) {
-            binop(b->op, b->left, b->right, s->target);
-            return;
-        } else if (IR::Call *c = s->source->asCall()) {
-            if (c->base->asName()) {
-                callBuiltin(c, s->target);
-                return;
-            } else if (Member *member = c->base->asMember()) {
-#ifndef V4_BOOTSTRAP
-                Q_ASSERT(member->kind != IR::Member::MemberOfIdObjectsArray);
-                if (member->kind == IR::Member::MemberOfQmlScopeObject || member->kind == IR::Member::MemberOfQmlContextObject) {
-                    callQmlContextProperty(member->base, (IR::Member::MemberKind)member->kind, member->property->coreIndex(), c->args, s->target);
-                    return;
-                }
-#endif
-                callProperty(member->base, *member->name, c->args, s->target);
-                return;
-            } else if (Subscript *ss = c->base->asSubscript()) {
-                callSubscript(ss->base, ss->index, c->args, s->target);
-                return;
-            } else if (c->base->asTemp() || c->base->asArgLocal() || c->base->asConst()) {
-                callValue(c->base, c->args, s->target);
-                return;
-            }
-        } else if (IR::Convert *c = s->source->asConvert()) {
-            Q_ASSERT(c->expr->asTemp() || c->expr->asArgLocal());
-            convertType(c->expr, s->target);
-            return;
-        }
-    } else if (IR::Member *m = s->target->asMember()) {
-        if (m->base->asTemp() || m->base->asConst() || m->base->asArgLocal()) {
-            if (s->source->asTemp() || s->source->asConst() || s->source->asArgLocal()) {
-                Q_ASSERT(m->kind != IR::Member::MemberOfEnum);
-                Q_ASSERT(m->kind != IR::Member::MemberOfIdObjectsArray);
-                const int attachedPropertiesId = m->attachedPropertiesId;
-                if (m->property && attachedPropertiesId == 0) {
-#ifdef V4_BOOTSTRAP
-                    Q_UNIMPLEMENTED();
-#else
-                    if (m->kind == IR::Member::MemberOfQmlScopeObject || m->kind == IR::Member::MemberOfQmlContextObject) {
-                        setQmlContextProperty(s->source, m->base, (IR::Member::MemberKind)m->kind, m->property->coreIndex());
-                        return;
-                    }
-                    setQObjectProperty(s->source, m->base, m->property->coreIndex());
-#endif
-                    return;
-                } else {
-                    setProperty(s->source, m->base, *m->name);
-                    return;
-                }
-            }
-        }
-    } else if (IR::Subscript *ss = s->target->asSubscript()) {
-        if (s->source->asTemp() || s->source->asConst() || s->source->asArgLocal()) {
-            setElement(s->source, ss->base, ss->index);
-            return;
-        }
-    }
-
-    // For anything else...:
-    Q_UNIMPLEMENTED();
-    QBuffer buf;
-    buf.open(QIODevice::WriteOnly);
-    QTextStream qout(&buf);
-    IRPrinter(&qout).print(s);
-    qout << endl;
-    qDebug("%s", buf.data().constData());
-    Q_ASSERT(!"TODO");
-}
-
-IRDecoder::~IRDecoder()
-{
-}
-
-void IRDecoder::visitExp(IR::Exp *s)
-{
-    if (IR::Call *c = s->expr->asCall()) {
-        // These are calls where the result is ignored.
-        if (c->base->asName()) {
-            callBuiltin(c, 0);
-        } else if (c->base->asTemp() || c->base->asArgLocal() || c->base->asConst()) {
-            callValue(c->base, c->args, 0);
-        } else if (Member *member = c->base->asMember()) {
-            Q_ASSERT(member->base->asTemp() || member->base->asArgLocal());
-#ifndef V4_BOOTSTRAP
-            Q_ASSERT(member->kind != IR::Member::MemberOfIdObjectsArray);
-            if (member->kind == IR::Member::MemberOfQmlScopeObject || member->kind == IR::Member::MemberOfQmlContextObject) {
-                callQmlContextProperty(member->base, (IR::Member::MemberKind)member->kind, member->property->coreIndex(), c->args, 0);
-                return;
-            }
-#endif
-            callProperty(member->base, *member->name, c->args, 0);
-        } else if (Subscript *s = c->base->asSubscript()) {
-            callSubscript(s->base, s->index, c->args, 0);
-        } else {
-            Q_UNREACHABLE();
-        }
-    } else {
-        Q_UNREACHABLE();
-    }
-}
-
-void IRDecoder::callBuiltin(IR::Call *call, Expr *result)
-{
-    IR::Name *baseName = call->base->asName();
-    Q_ASSERT(baseName != 0);
-
-    switch (baseName->builtin) {
-    case IR::Name::builtin_invalid:
-        callBuiltinInvalid(baseName, call->args, result);
-        return;
-
-    case IR::Name::builtin_typeof: {
-        if (IR::Member *member = call->args->expr->asMember()) {
-#ifndef V4_BOOTSTRAP
-            Q_ASSERT(member->kind != IR::Member::MemberOfIdObjectsArray);
-            if (member->kind == IR::Member::MemberOfQmlScopeObject || member->kind == IR::Member::MemberOfQmlContextObject) {
-                callBuiltinTypeofQmlContextProperty(member->base,
-                                                    IR::Member::MemberKind(member->kind),
-                                                    member->property->coreIndex(), result);
-                return;
-            }
-#endif
-            callBuiltinTypeofMember(member->base, *member->name, result);
-            return;
-        } else if (IR::Subscript *ss = call->args->expr->asSubscript()) {
-            callBuiltinTypeofSubscript(ss->base, ss->index, result);
-            return;
-        } else if (IR::Name *n = call->args->expr->asName()) {
-            callBuiltinTypeofName(*n->id, result);
-            return;
-        } else if (call->args->expr->asTemp() ||
-                   call->args->expr->asConst() ||
-                   call->args->expr->asArgLocal()) {
-            callBuiltinTypeofValue(call->args->expr, result);
-            return;
-        }
-    } break;
-
-    case IR::Name::builtin_delete: {
-        if (IR::Member *m = call->args->expr->asMember()) {
-            callBuiltinDeleteMember(m->base, *m->name, result);
-            return;
-        } else if (IR::Subscript *ss = call->args->expr->asSubscript()) {
-            callBuiltinDeleteSubscript(ss->base, ss->index, result);
-            return;
-        } else if (IR::Name *n = call->args->expr->asName()) {
-            callBuiltinDeleteName(*n->id, result);
-            return;
-        } else if (call->args->expr->asTemp() ||
-                   call->args->expr->asArgLocal()) {
-            // TODO: should throw in strict mode
-            callBuiltinDeleteValue(result);
-            return;
-        }
-    } break;
-
-    case IR::Name::builtin_throw: {
-        IR::Expr *arg = call->args->expr;
-        Q_ASSERT(arg->asTemp() || arg->asConst() || arg->asArgLocal());
-        callBuiltinThrow(arg);
-    } return;
-
-    case IR::Name::builtin_rethrow: {
-        callBuiltinReThrow();
-    } return;
-
-    case IR::Name::builtin_unwind_exception: {
-        callBuiltinUnwindException(result);
-    } return;
-
-    case IR::Name::builtin_push_catch_scope: {
-        IR::String *s = call->args->expr->asString();
-        Q_ASSERT(s);
-        callBuiltinPushCatchScope(*s->value);
-    } return;
-
-    case IR::Name::builtin_foreach_iterator_object: {
-        IR::Expr *arg = call->args->expr;
-        Q_ASSERT(arg != 0);
-        callBuiltinForeachIteratorObject(arg, result);
-    } return;
-
-    case IR::Name::builtin_foreach_next_property_name: {
-        IR::Expr *arg = call->args->expr;
-        Q_ASSERT(arg != 0);
-        callBuiltinForeachNextPropertyname(arg, result);
-    } return;
-    case IR::Name::builtin_push_with_scope: {
-        if (call->args->expr->asTemp() || call->args->expr->asArgLocal())
-            callBuiltinPushWithScope(call->args->expr);
-        else
-            Q_UNIMPLEMENTED();
-    } return;
-
-    case IR::Name::builtin_pop_scope:
-        callBuiltinPopScope();
-        return;
-
-    case IR::Name::builtin_declare_vars: {
-        if (!call->args)
-            return;
-        IR::Const *deletable = call->args->expr->asConst();
-        Q_ASSERT(deletable->type == IR::BoolType);
-        for (IR::ExprList *it = call->args->next; it; it = it->next) {
-            IR::Name *arg = it->expr->asName();
-            Q_ASSERT(arg != 0);
-            callBuiltinDeclareVar(deletable->value != 0, *arg->id);
-        }
-    } return;
-
-    case IR::Name::builtin_define_array:
-        callBuiltinDefineArray(result, call->args);
-        return;
-
-    case IR::Name::builtin_define_object_literal: {
-        IR::ExprList *args = call->args;
-        const int keyValuePairsCount = args->expr->asConst()->value;
-        args = args->next;
-
-        IR::ExprList *keyValuePairs = args;
-        for (int i = 0; i < keyValuePairsCount; ++i) {
-            args = args->next; // name
-            bool isData = args->expr->asConst()->value;
-            args = args->next; // isData flag
-            args = args->next; // value or getter
-            if (!isData)
-                args = args->next; // setter
-        }
-
-        IR::ExprList *arrayEntries = args;
-        bool needSparseArray = false;
-        for (IR::ExprList *it = arrayEntries; it; it = it->next) {
-            uint index = it->expr->asConst()->value;
-            if (index > 16)  {
-                needSparseArray = true;
-                break;
-            }
-            it = it->next;
-            bool isData = it->expr->asConst()->value;
-            it = it->next;
-            if (!isData)
-                it = it->next;
-        }
-
-        callBuiltinDefineObjectLiteral(result, keyValuePairsCount, keyValuePairs, arrayEntries, needSparseArray);
-    } return;
-
-    case IR::Name::builtin_setup_argument_object:
-        callBuiltinSetupArgumentObject(result);
-        return;
-
-    case IR::Name::builtin_convert_this_to_object:
-        callBuiltinConvertThisToObject();
-        return;
-
-    default:
-        break;
-    }
-
-    Q_UNIMPLEMENTED();
-    QBuffer buf;
-    buf.open(QIODevice::WriteOnly);
-    QTextStream qout(&buf);
-    IRPrinter(&qout).print(call); qout << endl;
-    qDebug("%s", buf.data().constData());
-    Q_UNREACHABLE();
-}
diff --git a/src/qml/compiler/qv4isel_p.h b/src/qml/compiler/qv4isel_p.h
deleted file mode 100644
index 037c02e5ea..0000000000
--- a/src/qml/compiler/qv4isel_p.h
+++ /dev/null
@@ -1,218 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QV4ISEL_P_H
-#define QV4ISEL_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include "private/qv4global_p.h"
-#include "qv4jsir_p.h"
-#include <private/qv4compileddata_p.h>
-#include <private/qv4compiler_p.h>
-
-#include <qglobal.h>
-#include <QHash>
-
-QT_BEGIN_NAMESPACE
-
-class QQmlEnginePrivate;
-
-namespace QV4 {
-
-class EvalISelFactory;
-class ExecutableAllocator;
-struct Function;
-
-class Q_QML_PRIVATE_EXPORT EvalInstructionSelection
-{
-public:
-    EvalInstructionSelection(QV4::ExecutableAllocator *execAllocator, IR::Module *module, QV4::Compiler::JSUnitGenerator *jsGenerator, EvalISelFactory *iselFactory);
-    virtual ~EvalInstructionSelection() = 0;
-
-    QQmlRefPointer<QV4::CompiledData::CompilationUnit> compile(bool generateUnitData = true);
-
-    void setUseFastLookups(bool b) { useFastLookups = b; }
-    void setUseTypeInference(bool onoff) { useTypeInference = onoff; }
-
-    int registerString(const QString &str) { return jsGenerator->registerString(str); }
-    uint registerIndexedGetterLookup() { return jsGenerator->registerIndexedGetterLookup(); }
-    uint registerIndexedSetterLookup() { return jsGenerator->registerIndexedSetterLookup(); }
-    uint registerGetterLookup(const QString &name) { return jsGenerator->registerGetterLookup(name); }
-    uint registerSetterLookup(const QString &name) { return jsGenerator->registerSetterLookup(name); }
-    uint registerGlobalGetterLookup(const QString &name) { return jsGenerator->registerGlobalGetterLookup(name); }
-    int registerRegExp(IR::RegExp *regexp) { return jsGenerator->registerRegExp(regexp); }
-    int registerJSClass(int count, IR::ExprList *args) { return jsGenerator->registerJSClass(count, args); }
-    QV4::Compiler::JSUnitGenerator *jsUnitGenerator() const { return jsGenerator; }
-
-protected:
-    virtual void run(int functionIndex) = 0;
-    virtual QQmlRefPointer<QV4::CompiledData::CompilationUnit> backendCompileStep() = 0;
-
-    bool useFastLookups;
-    bool useTypeInference;
-    QV4::ExecutableAllocator *executableAllocator;
-    QV4::Compiler::JSUnitGenerator *jsGenerator;
-    QScopedPointer<QV4::Compiler::JSUnitGenerator> ownJSGenerator;
-    IR::Module *irModule;
-};
-
-class Q_QML_PRIVATE_EXPORT EvalISelFactory
-{
-public:
-    EvalISelFactory(const QString &codeGeneratorName) : codeGeneratorName(codeGeneratorName) {}
-    virtual ~EvalISelFactory() = 0;
-    virtual EvalInstructionSelection *create(QQmlEnginePrivate *qmlEngine, QV4::ExecutableAllocator *execAllocator, IR::Module *module, QV4::Compiler::JSUnitGenerator *jsGenerator) = 0;
-    virtual bool jitCompileRegexps() const = 0;
-    virtual QQmlRefPointer<QV4::CompiledData::CompilationUnit> createUnitForLoading() = 0;
-
-    const QString codeGeneratorName;
-};
-
-namespace IR {
-class Q_QML_PRIVATE_EXPORT IRDecoder
-{
-public:
-    IRDecoder() : _function(0) {}
-    virtual ~IRDecoder() = 0;
-
-    void visit(Stmt *s)
-    {
-        if (auto e = s->asExp()) {
-            visitExp(e);
-        } else if (auto m = s->asMove()) {
-            visitMove(m);
-        } else if (auto j = s->asJump()) {
-            visitJump(j);
-        } else if (auto c = s->asCJump()) {
-            visitCJump(c);
-        } else if (auto r = s->asRet()) {
-            visitRet(r);
-        } else if (auto p = s->asPhi()) {
-            visitPhi(p);
-        } else {
-            Q_UNREACHABLE();
-        }
-    }
-
-private: // visitor methods for StmtVisitor:
-    void visitMove(IR::Move *s);
-    void visitExp(IR::Exp *s);
-
-public: // to implement by subclasses:
-    virtual void callBuiltinInvalid(IR::Name *func, IR::ExprList *args, IR::Expr *result) = 0;
-    virtual void callBuiltinTypeofQmlContextProperty(IR::Expr *base, IR::Member::MemberKind kind, int propertyIndex, IR::Expr *result) = 0;
-    virtual void callBuiltinTypeofMember(IR::Expr *base, const QString &name, IR::Expr *result) = 0;
-    virtual void callBuiltinTypeofSubscript(IR::Expr *base, IR::Expr *index, IR::Expr *result) = 0;
-    virtual void callBuiltinTypeofName(const QString &name, IR::Expr *result) = 0;
-    virtual void callBuiltinTypeofValue(IR::Expr *value, IR::Expr *result) = 0;
-    virtual void callBuiltinDeleteMember(IR::Expr *base, const QString &name, IR::Expr *result) = 0;
-    virtual void callBuiltinDeleteSubscript(IR::Expr *base, IR::Expr *index, IR::Expr *result) = 0;
-    virtual void callBuiltinDeleteName(const QString &name, IR::Expr *result) = 0;
-    virtual void callBuiltinDeleteValue(IR::Expr *result) = 0;
-    virtual void callBuiltinThrow(IR::Expr *arg) = 0;
-    virtual void callBuiltinReThrow() = 0;
-    virtual void callBuiltinUnwindException(IR::Expr *) = 0;
-    virtual void callBuiltinPushCatchScope(const QString &exceptionName) = 0;
-    virtual void callBuiltinForeachIteratorObject(IR::Expr *arg, IR::Expr *result) = 0;
-    virtual void callBuiltinForeachNextPropertyname(IR::Expr *arg, IR::Expr *result) = 0;
-    virtual void callBuiltinPushWithScope(IR::Expr *arg) = 0;
-    virtual void callBuiltinPopScope() = 0;
-    virtual void callBuiltinDeclareVar(bool deletable, const QString &name) = 0;
-    virtual void callBuiltinDefineArray(IR::Expr *result, IR::ExprList *args) = 0;
-    virtual void callBuiltinDefineObjectLiteral(IR::Expr *result, int keyValuePairCount, IR::ExprList *keyValuePairs, IR::ExprList *arrayEntries, bool needSparseArray) = 0;
-    virtual void callBuiltinSetupArgumentObject(IR::Expr *result) = 0;
-    virtual void callBuiltinConvertThisToObject() = 0;
-    virtual void callValue(IR::Expr *value, IR::ExprList *args, IR::Expr *result) = 0;
-    virtual void callQmlContextProperty(IR::Expr *base, IR::Member::MemberKind kind, int propertyIndex, IR::ExprList *args, IR::Expr *result) = 0;
-    virtual void callProperty(IR::Expr *base, const QString &name, IR::ExprList *args, IR::Expr *result) = 0;
-    virtual void callSubscript(IR::Expr *base, IR::Expr *index, IR::ExprList *args, IR::Expr *result) = 0;
-    virtual void convertType(IR::Expr *source, IR::Expr *target) = 0;
-    virtual void constructActivationProperty(IR::Name *func, IR::ExprList *args, IR::Expr *result) = 0;
-    virtual void constructProperty(IR::Expr *base, const QString &name, IR::ExprList *args, IR::Expr *result) = 0;
-    virtual void constructValue(IR::Expr *value, IR::ExprList *args, IR::Expr *result) = 0;
-    virtual void loadThisObject(IR::Expr *target) = 0;
-    virtual void loadQmlContext(IR::Expr *target) = 0;
-    virtual void loadQmlImportedScripts(IR::Expr *target) = 0;
-    virtual void loadQmlSingleton(const QString &name, IR::Expr *target) = 0;
-    virtual void loadConst(IR::Const *sourceConst, IR::Expr *target) = 0;
-    virtual void loadString(const QString &str, IR::Expr *target) = 0;
-    virtual void loadRegexp(IR::RegExp *sourceRegexp, IR::Expr *target) = 0;
-    virtual void getActivationProperty(const IR::Name *name, IR::Expr *target) = 0;
-    virtual void setActivationProperty(IR::Expr *source, const QString &targetName) = 0;
-    virtual void initClosure(IR::Closure *closure, IR::Expr *target) = 0;
-    virtual void getProperty(IR::Expr *base, const QString &name, IR::Expr *target) = 0;
-    virtual void getQObjectProperty(IR::Expr *base, int propertyIndex, bool captureRequired, bool isSingletonProperty, int attachedPropertiesId, IR::Expr *target) = 0;
-    virtual void getQmlContextProperty(IR::Expr *source, IR::Member::MemberKind kind, int index, bool captureRequired, IR::Expr *target) = 0;
-    virtual void setProperty(IR::Expr *source, IR::Expr *targetBase, const QString &targetName) = 0;
-    virtual void setQmlContextProperty(IR::Expr *source, IR::Expr *targetBase, IR::Member::MemberKind kind, int propertyIndex) = 0;
-    virtual void setQObjectProperty(IR::Expr *source, IR::Expr *targetBase, int propertyIndex) = 0;
-    virtual void getElement(IR::Expr *base, IR::Expr *index, IR::Expr *target) = 0;
-    virtual void setElement(IR::Expr *source, IR::Expr *targetBase, IR::Expr *targetIndex) = 0;
-    virtual void copyValue(IR::Expr *source, IR::Expr *target) = 0;
-    virtual void swapValues(IR::Expr *source, IR::Expr *target) = 0;
-    virtual void unop(IR::AluOp oper, IR::Expr *source, IR::Expr *target) = 0;
-    virtual void binop(IR::AluOp oper, IR::Expr *leftSource, IR::Expr *rightSource, IR::Expr *target) = 0;
-
-protected:
-    virtual void visitJump(IR::Jump *) = 0;
-    virtual void visitCJump(IR::CJump *) = 0;
-    virtual void visitRet(IR::Ret *) = 0;
-    virtual void visitPhi(IR::Phi *) {}
-
-    virtual void callBuiltin(IR::Call *c, IR::Expr *result);
-
-    IR::Function *_function; // subclass needs to set
-};
-} // namespace IR
-
-} // namespace QV4
-
-QT_END_NAMESPACE
-
-#endif // QV4ISEL_P_H
diff --git a/src/qml/compiler/qv4isel_util_p.h b/src/qml/compiler/qv4isel_util_p.h
deleted file mode 100644
index e949e6f0ad..0000000000
--- a/src/qml/compiler/qv4isel_util_p.h
+++ /dev/null
@@ -1,241 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QV4ISEL_UTIL_P_H
-#define QV4ISEL_UTIL_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include "private/qv4value_p.h"
-#include "qv4jsir_p.h"
-
-QT_BEGIN_NAMESPACE
-
-namespace QV4 {
-
-struct TargetPrimitive32 {
-    static TargetPrimitive32 emptyValue() { TargetPrimitive32 p; p._val = quint64(Value::ValueTypeInternal_32::Empty) << 32; return p; }
-    static TargetPrimitive32 nullValue() { TargetPrimitive32 p; p._val = quint64(Value::ValueTypeInternal_32::Null) << 32; return p; }
-    static TargetPrimitive32 undefinedValue() { TargetPrimitive32 p; p._val = quint64(Value::Managed_Type_Internal_32) << 32; return p; }
-    static TargetPrimitive32 fromBoolean(bool b) { TargetPrimitive32 p; p._val = quint64(Value::ValueTypeInternal_32::Boolean) << 32 | quint64(b); return p; }
-    static TargetPrimitive32 fromInt32(int v) { TargetPrimitive32 p; p._val = quint64(Value::ValueTypeInternal_32::Integer) << 32 | quint32(v); return p; }
-    static TargetPrimitive32 fromDouble(double v) {
-        TargetPrimitive32 p;
-        memcpy(&p._val, &v, 8);
-        return p;
-    }
-    static TargetPrimitive32 fromUInt32(uint v) {
-        if (v < INT_MAX)
-            return fromInt32(qint32(v));
-        return fromDouble(double(v));
-    }
-
-    quint32 value() const { return _val & quint64(~quint32(0)); }
-    quint32 tag() const { return _val >> 32; }
-
-    quint64 rawValue() const { return _val; }
-
-private:
-    quint64 _val;
-};
-
-struct TargetPrimitive64 {
-    static TargetPrimitive64 emptyValue() { TargetPrimitive64 p; p._val = quint64(Value::ValueTypeInternal_64::Empty) << 32; return p; }
-    static TargetPrimitive64 nullValue() { TargetPrimitive64 p; p._val = quint64(Value::ValueTypeInternal_64::Null) << 32; return p; }
-    static TargetPrimitive64 undefinedValue() { TargetPrimitive64 p; p._val = 0; return p; }
-    static TargetPrimitive64 fromBoolean(bool b) { TargetPrimitive64 p; p._val = quint64(Value::ValueTypeInternal_64::Boolean) << 32 | quint64(b); return p; }
-    static TargetPrimitive64 fromInt32(int v) { TargetPrimitive64 p; p._val = quint64(Value::ValueTypeInternal_64::Integer) << 32 | quint32(v); return p; }
-    static TargetPrimitive64 fromDouble(double v) {
-        TargetPrimitive64 p;
-        memcpy(&p._val, &v, 8);
-        p._val ^= Value::NaNEncodeMask;
-        return p;
-    }
-    static TargetPrimitive64 fromUInt32(uint v) {
-        if (v < INT_MAX)
-            return fromInt32(qint32(v));
-        return fromDouble(double(v));
-    }
-
-    quint32 value() const { return _val & quint64(~quint32(0)); }
-    quint32 tag() const { return _val >> 32; }
-
-    quint64 rawValue() const { return _val; }
-
-private:
-    quint64 _val;
-};
-
-inline bool canConvertToSignedInteger(double value)
-{
-    int ival = (int) value;
-    // +0 != -0, so we need to convert to double when negating 0
-    return ival == value && !(value == 0 && isNegative(value));
-}
-
-inline bool canConvertToUnsignedInteger(double value)
-{
-    unsigned uval = (unsigned) value;
-    // +0 != -0, so we need to convert to double when negating 0
-    return uval == value && !(value == 0 && isNegative(value));
-}
-
-template <typename PrimitiveType = Primitive>
-inline PrimitiveType convertToValue(IR::Const *c)
-{
-    switch (c->type) {
-    case IR::MissingType:
-        return PrimitiveType::emptyValue();
-    case IR::NullType:
-        return PrimitiveType::nullValue();
-    case IR::UndefinedType:
-        return PrimitiveType::undefinedValue();
-    case IR::BoolType:
-        return PrimitiveType::fromBoolean(c->value != 0);
-    case IR::SInt32Type:
-        return PrimitiveType::fromInt32(int(c->value));
-    case IR::UInt32Type:
-        return PrimitiveType::fromUInt32(unsigned(c->value));
-    case IR::DoubleType:
-        return PrimitiveType::fromDouble(c->value);
-    case IR::NumberType: {
-        int ival = (int)c->value;
-        if (canConvertToSignedInteger(c->value)) {
-            return PrimitiveType::fromInt32(ival);
-        } else {
-            return PrimitiveType::fromDouble(c->value);
-        }
-    }
-    default:
-        Q_UNREACHABLE();
-    }
-    // unreachable, but the function must return something
-    return PrimitiveType::undefinedValue();
-}
-
-class ConvertTemps
-{
-    void renumber(IR::Temp *t)
-    {
-        if (t->kind != IR::Temp::VirtualRegister)
-            return;
-
-        int stackSlot = _stackSlotForTemp.value(t->index, -1);
-        if (stackSlot == -1) {
-            stackSlot = allocateFreeSlot();
-            _stackSlotForTemp[t->index] = stackSlot;
-        }
-
-        t->kind = IR::Temp::StackSlot;
-        t->index = stackSlot;
-    }
-
-protected:
-    int _nextUnusedStackSlot;
-    QHash<int, int> _stackSlotForTemp;
-    IR::BasicBlock *_currentBasicBlock;
-    virtual int allocateFreeSlot()
-    {
-        return _nextUnusedStackSlot++;
-    }
-
-    virtual void process(IR::Stmt *s)
-    {
-        visit(s);
-    }
-
-public:
-    ConvertTemps()
-        : _nextUnusedStackSlot(0)
-        , _currentBasicBlock(0)
-    {}
-
-    void toStackSlots(IR::Function *function)
-    {
-        _stackSlotForTemp.reserve(function->tempCount);
-
-        for (IR::BasicBlock *bb : function->basicBlocks()) {
-            if (bb->isRemoved())
-                continue;
-            _currentBasicBlock = bb;
-            for (IR::Stmt *s : bb->statements())
-                process(s);
-        }
-
-        function->tempCount = _nextUnusedStackSlot;
-    }
-
-protected:
-    void visit(IR::Stmt *s) {
-        switch (s->stmtKind) {
-        case IR::Stmt::PhiStmt:
-            visitPhi(s->asPhi());
-            break;
-        default:
-            STMT_VISIT_ALL_KINDS(s);
-            break;
-        }
-    }
-
-    virtual void visitPhi(IR::Phi *)
-    { Q_UNREACHABLE(); }
-
-private:
-    void visit(IR::Expr *e) {
-        if (auto temp = e->asTemp()) {
-            renumber(temp);
-        } else {
-            EXPR_VISIT_ALL_KINDS(e);
-        }
-    }
-};
-} // namespace QV4
-
-QT_END_NAMESPACE
-
-#endif // QV4ISEL_UTIL_P_H
diff --git a/src/qml/compiler/qv4jsir.cpp b/src/qml/compiler/qv4jsir.cpp
deleted file mode 100644
index 0b0ed391fb..0000000000
--- a/src/qml/compiler/qv4jsir.cpp
+++ /dev/null
@@ -1,993 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qv4jsir_p.h"
-#include <private/qqmljsast_p.h>
-
-#ifndef V4_BOOTSTRAP
-#include <private/qqmlpropertycache_p.h>
-#endif
-
-#include <QtCore/QBuffer>
-#include <QtCore/qtextstream.h>
-#include <QtCore/qdebug.h>
-#include <QtCore/qset.h>
-#include <cmath>
-
-#include <vector>
-
-#ifdef CONST
-#undef CONST
-#endif
-
-QT_BEGIN_NAMESPACE
-
-namespace QV4 {
-namespace IR {
-
-QString typeName(Type t)
-{
-    switch (t) {
-    case UnknownType: return QStringLiteral("");
-    case MissingType: return QStringLiteral("missing");
-    case UndefinedType: return QStringLiteral("undefined");
-    case NullType: return QStringLiteral("null");
-    case BoolType: return QStringLiteral("bool");
-    case UInt32Type: return QStringLiteral("uint32");
-    case SInt32Type: return QStringLiteral("int32");
-    case DoubleType: return QStringLiteral("double");
-    case NumberType: return QStringLiteral("number");
-    case StringType: return QStringLiteral("string");
-    case VarType: return QStringLiteral("var");
-    case QObjectType: return QStringLiteral("qobject");
-    default: return QStringLiteral("multiple");
-    }
-}
-
-const char *opname(AluOp op)
-{
-    switch (op) {
-    case OpInvalid: return "?";
-
-    case OpIfTrue: return "(bool)";
-    case OpNot: return "not";
-    case OpUMinus: return "neg";
-    case OpUPlus: return "plus";
-    case OpCompl: return "invert";
-    case OpIncrement: return "incr";
-    case OpDecrement: return "decr";
-
-    case OpBitAnd: return "bitand";
-    case OpBitOr: return "bitor";
-    case OpBitXor: return "bitxor";
-
-    case OpAdd: return "add";
-    case OpSub: return "sub";
-    case OpMul: return "mul";
-    case OpDiv: return "div";
-    case OpMod: return "mod";
-
-    case OpLShift: return "shl";
-    case OpRShift: return "shr";
-    case OpURShift: return "asr";
-
-    case OpGt: return "gt";
-    case OpLt: return "lt";
-    case OpGe: return "ge";
-    case OpLe: return "le";
-    case OpEqual: return "eq";
-    case OpNotEqual: return "ne";
-    case OpStrictEqual: return "se";
-    case OpStrictNotEqual: return "sne";
-
-    case OpInstanceof: return "instanceof";
-    case OpIn: return "in";
-
-    case OpAnd: return "and";
-    case OpOr: return "or";
-
-    default: return "?";
-
-    } // switch
-}
-
-AluOp binaryOperator(int op)
-{
-    switch (static_cast<QSOperator::Op>(op)) {
-    case QSOperator::Add: return OpAdd;
-    case QSOperator::And: return OpAnd;
-    case QSOperator::BitAnd: return OpBitAnd;
-    case QSOperator::BitOr: return OpBitOr;
-    case QSOperator::BitXor: return OpBitXor;
-    case QSOperator::Div: return OpDiv;
-    case QSOperator::Equal: return OpEqual;
-    case QSOperator::Ge: return OpGe;
-    case QSOperator::Gt: return OpGt;
-    case QSOperator::Le: return OpLe;
-    case QSOperator::LShift: return OpLShift;
-    case QSOperator::Lt: return OpLt;
-    case QSOperator::Mod: return OpMod;
-    case QSOperator::Mul: return OpMul;
-    case QSOperator::NotEqual: return OpNotEqual;
-    case QSOperator::Or: return OpOr;
-    case QSOperator::RShift: return OpRShift;
-    case QSOperator::StrictEqual: return OpStrictEqual;
-    case QSOperator::StrictNotEqual: return OpStrictNotEqual;
-    case QSOperator::Sub: return OpSub;
-    case QSOperator::URShift: return OpURShift;
-    case QSOperator::InstanceOf: return OpInstanceof;
-    case QSOperator::In: return OpIn;
-    default: return OpInvalid;
-    }
-}
-
-class RemoveSharedExpressions
-{
-    CloneExpr clone;
-    std::vector<Expr *> subexpressions; // contains all the non-cloned subexpressions in the given function. sorted using std::lower_bound.
-    Expr *uniqueExpr;
-
-public:
-    RemoveSharedExpressions(): uniqueExpr(0) {}
-
-    void operator()(IR::Function *function)
-    {
-        subexpressions.clear();
-        subexpressions.reserve(function->basicBlockCount() * 8);
-
-        for (BasicBlock *block : function->basicBlocks()) {
-            if (block->isRemoved())
-                continue;
-            clone.setBasicBlock(block);
-
-            for (Stmt *s : block->statements()) {
-                visit(s);
-            }
-        }
-    }
-
-private:
-    template <typename Expr_>
-    Expr_ *cleanup(Expr_ *expr)
-    {
-        std::vector<Expr *>::iterator it = std::lower_bound(subexpressions.begin(), subexpressions.end(), expr);
-        if (it == subexpressions.end() || *it != expr) {
-            subexpressions.insert(it, expr);
-            IR::Expr *e = expr;
-            qSwap(uniqueExpr, e);
-            visit(expr);
-            qSwap(uniqueExpr, e);
-            return static_cast<Expr_ *>(e);
-        }
-
-        // the cloned expression is unique by definition
-        // so we don't need to add it to `subexpressions'.
-        return clone(expr);
-    }
-
-    void visit(Stmt *s)
-    {
-        if (auto e = s->asExp()) {
-            e->expr = cleanup(e->expr);
-        } else if (auto m = s->asMove()) {
-            m->target = cleanup(m->target);
-            m->source = cleanup(m->source);
-        } else if (auto c = s->asCJump()) {
-            c->cond = cleanup(c->cond);
-        } else if (auto r = s->asRet()) {
-            r->expr = cleanup(r->expr);
-        }
-    }
-
-    void visit(Expr *e)
-    {
-        if (auto c = e->asConvert()) {
-            c->expr = cleanup(c->expr);
-        } else if (auto u = e->asUnop()) {
-            u->expr = cleanup(u->expr);
-        } else if (auto b = e->asBinop()) {
-            b->left = cleanup(b->left);
-            b->right = cleanup(b->right);
-        } else if (auto c = e->asCall()) {
-            c->base = cleanup(c->base);
-            for (IR::ExprList *it = c->args; it; it = it->next) {
-                it->expr = cleanup(it->expr);
-            }
-        } else if (auto n = e->asNew()) {
-            n->base = cleanup(n->base);
-            for (IR::ExprList *it = n->args; it; it = it->next) {
-                it->expr = cleanup(it->expr);
-            }
-        } else if (auto s = e->asSubscript()) {
-            s->base = cleanup(s->base);
-            s->index = cleanup(s->index);
-        } else if (auto m = e->asMember()) {
-            m->base = cleanup(m->base);
-        }
-    }
-};
-
-void Name::initGlobal(const QString *id, quint32 line, quint32 column)
-{
-    this->id = id;
-    this->builtin = builtin_invalid;
-    this->global = true;
-    this->qmlSingleton = false;
-    this->freeOfSideEffects = false;
-    this->line = line;
-    this->column = column;
-}
-
-void Name::init(const QString *id, quint32 line, quint32 column)
-{
-    this->id = id;
-    this->builtin = builtin_invalid;
-    this->global = false;
-    this->qmlSingleton = false;
-    this->freeOfSideEffects = false;
-    this->line = line;
-    this->column = column;
-}
-
-void Name::init(Builtin builtin, quint32 line, quint32 column)
-{
-    this->id = 0;
-    this->builtin = builtin;
-    this->global = false;
-    this->qmlSingleton = false;
-    this->freeOfSideEffects = false;
-    this->line = line;
-    this->column = column;
-}
-
-const char *builtin_to_string(Name::Builtin b)
-{
-    switch (b) {
-    case Name::builtin_invalid:
-        return "builtin_invalid";
-    case Name::builtin_typeof:
-        return "builtin_typeof";
-    case Name::builtin_delete:
-        return "builtin_delete";
-    case Name::builtin_throw:
-        return "builtin_throw";
-    case Name::builtin_rethrow:
-        return "builtin_rethrow";
-    case Name::builtin_unwind_exception:
-        return "builtin_unwind_exception";
-    case Name::builtin_push_catch_scope:
-        return "builtin_push_catch_scope";
-    case IR::Name::builtin_foreach_iterator_object:
-        return "builtin_foreach_iterator_object";
-    case IR::Name::builtin_foreach_next_property_name:
-        return "builtin_foreach_next_property_name";
-    case IR::Name::builtin_push_with_scope:
-        return "builtin_push_with_scope";
-    case IR::Name::builtin_pop_scope:
-        return "builtin_pop_scope";
-    case IR::Name::builtin_declare_vars:
-        return "builtin_declare_vars";
-    case IR::Name::builtin_define_array:
-        return "builtin_define_array";
-    case IR::Name::builtin_define_object_literal:
-        return "builtin_define_object_literal";
-    case IR::Name::builtin_setup_argument_object:
-        return "builtin_setup_argument_object";
-    case IR::Name::builtin_convert_this_to_object:
-        return "builtin_convert_this_to_object";
-    case IR::Name::builtin_qml_context:
-        return "builtin_qml_context";
-    case IR::Name::builtin_qml_imported_scripts_object:
-        return "builtin_qml_imported_scripts_object";
-    }
-    return "builtin_(###FIXME)";
-};
-
-bool operator<(const Temp &t1, const Temp &t2) Q_DECL_NOTHROW
-{
-    if (t1.kind < t2.kind) return true;
-    if (t1.kind > t2.kind) return false;
-    return t1.index < t2.index;
-}
-
-Function *Module::newFunction(const QString &name, Function *outer)
-{
-    Function *f = new Function(this, outer, name);
-    functions.append(f);
-    if (!outer) {
-        if (!isQmlModule) {
-            Q_ASSERT(!rootFunction);
-            rootFunction = f;
-        }
-    } else {
-        outer->nestedFunctions.append(f);
-    }
-    return f;
-}
-
-Module::~Module()
-{
-    qDeleteAll(functions);
-}
-
-void Module::setFileName(const QString &name)
-{
-    fileName = name;
-}
-
-Function::Function(Module *module, Function *outer, const QString &name)
-    : module(module)
-    , pool(&module->pool)
-    , tempCount(0)
-    , maxNumberOfArguments(0)
-    , outer(outer)
-    , insideWithOrCatch(0)
-    , hasDirectEval(false)
-    , usesArgumentsObject(false)
-    , usesThis(false)
-    , isStrict(false)
-    , isNamedExpression(false)
-    , hasTry(false)
-    , hasWith(false)
-    , isQmlBinding(false)
-    , unused(0)
-    , line(0)
-    , column(0)
-    , _allBasicBlocks(0)
-    , _statementCount(0)
-{
-    this->name = newString(name);
-    _basicBlocks.reserve(8);
-}
-
-Function::~Function()
-{
-    if (_allBasicBlocks) {
-        qDeleteAll(*_allBasicBlocks);
-        delete _allBasicBlocks;
-    } else {
-        qDeleteAll(_basicBlocks);
-    }
-
-    pool = 0;
-    module = 0;
-}
-
-
-const QString *Function::newString(const QString &text)
-{
-    return &*strings.insert(text);
-}
-
-BasicBlock *Function::newBasicBlock(BasicBlock *catchBlock, BasicBlockInsertMode mode)
-{
-    BasicBlock *block = new BasicBlock(this, catchBlock);
-    return mode == InsertBlock ? addBasicBlock(block) : block;
-}
-
-BasicBlock *Function::addBasicBlock(BasicBlock *block)
-{
-    Q_ASSERT(block->index() < 0);
-    block->setIndex(_basicBlocks.size());
-    _basicBlocks.append(block);
-    return block;
-}
-
-void Function::removeBasicBlock(BasicBlock *block)
-{
-    block->markAsRemoved();
-    block->in.clear();
-    block->out.clear();
-}
-
-int Function::liveBasicBlocksCount() const
-{
-    int count = 0;
-    for (BasicBlock *bb : basicBlocks())
-        if (!bb->isRemoved())
-            ++count;
-    return count;
-}
-
-void Function::removeSharedExpressions()
-{
-    RemoveSharedExpressions removeSharedExpressions;
-    removeSharedExpressions(this);
-}
-
-int Function::indexOfArgument(const QStringRef &string) const
-{
-    for (int i = formals.size() - 1; i >= 0; --i) {
-        if (*formals.at(i) == string)
-            return i;
-    }
-    return -1;
-}
-
-void Function::setScheduledBlocks(const QVector<BasicBlock *> &scheduled)
-{
-    Q_ASSERT(!_allBasicBlocks);
-    _allBasicBlocks = new QVector<BasicBlock *>(basicBlocks());
-    _basicBlocks = scheduled;
-    for (int i = 0, ei = basicBlockCount(); i != ei; ++i)
-        basicBlock(i)->changeIndex(i);
-}
-
-BasicBlock *Function::getOrCreateBasicBlock(int index)
-{
-    if (_basicBlocks.size() <= index) {
-        const int oldSize = _basicBlocks.size();
-        _basicBlocks.resize(index + 1);
-        for (int i = oldSize; i <= index; ++i) {
-            BasicBlock *block = new BasicBlock(this, 0);
-            block->setIndex(i);
-            _basicBlocks[i] = block;
-        }
-    }
-
-    return _basicBlocks.at(index);
-}
-
-void Function::setStatementCount(int cnt)
-{
-    _statementCount = cnt;
-}
-
-void BasicBlock::setStatements(const QVector<Stmt *> &newStatements)
-{
-    Q_ASSERT(!isRemoved());
-    Q_ASSERT(newStatements.size() >= _statements.size());
-    for (Stmt *s : qAsConst(_statements)) {
-        if (Phi *p = s->asPhi()) {
-            if (!newStatements.contains(p)) {
-                // phi-node was not copied over, so:
-                p->destroyData();
-            }
-        } else {
-            break;
-        }
-    }
-    _statements = newStatements;
-}
-
-CloneExpr::CloneExpr(BasicBlock *block)
-    : block(block), cloned(0)
-{
-}
-
-void CloneExpr::setBasicBlock(BasicBlock *block)
-{
-    this->block = block;
-}
-
-ExprList *CloneExpr::clone(ExprList *list)
-{
-    if (! list)
-        return 0;
-
-    ExprList *clonedList = block->function->New<IR::ExprList>();
-    clonedList->init(clone(list->expr), clone(list->next));
-    return clonedList;
-}
-
-void CloneExpr::visit(Expr *e)
-{
-    if (auto c = e->asConst()) {
-        cloned = cloneConst(c, block->function);
-    } else if (auto s = e->asString()) {
-        cloned = block->STRING(s->value);
-    } else if (auto r = e->asRegExp()) {
-        cloned = block->REGEXP(r->value, r->flags);
-    } else if (auto n = e->asName()) {
-        cloned = cloneName(n, block->function);
-    } else if (auto t = e->asTemp()) {
-        cloned = cloneTemp(t, block->function);
-    } else if (auto a = e->asArgLocal()) {
-        cloned = cloneArgLocal(a, block->function);
-    } else if (auto c = e->asClosure()) {
-        cloned = block->CLOSURE(c->value);
-    } else if (auto c = e->asConvert()) {
-        cloned = block->CONVERT(clone(c->expr), c->type);
-    } else if (auto u = e->asUnop()) {
-        cloned = block->UNOP(u->op, clone(u->expr));
-    } else if (auto b = e->asBinop()) {
-        cloned = block->BINOP(b->op, clone(b->left), clone(b->right));
-    } else if (auto c = e->asCall()) {
-        cloned = block->CALL(clone(c->base), clone(c->args));
-    } else if (auto n = e->asNew()) {
-        cloned = block->NEW(clone(n->base), clone(n->args));
-    } else if (auto s = e->asSubscript()) {
-        cloned = block->SUBSCRIPT(clone(s->base), clone(s->index));
-    } else if (auto m = e->asMember()) {
-        cloned = block->MEMBER(clone(m->base), m->name, m->property, m->kind, m->idIndex);
-    } else {
-        Q_UNREACHABLE();
-    }
-}
-
-IRPrinter::IRPrinter(QTextStream *out)
-    : out(out)
-    , positionSize(Stmt::InvalidId)
-    , currentBB(0)
-{
-}
-
-IRPrinter::~IRPrinter()
-{
-}
-
-void IRPrinter::print(Stmt *s)
-{
-    visit(s);
-}
-
-void IRPrinter::print(const Expr &e)
-{
-    visit(const_cast<Expr *>(&e));
-}
-
-void IRPrinter::print(Expr *e)
-{
-    visit(e);
-}
-
-void IRPrinter::print(Function *f)
-{
-    if (positionSize == Stmt::InvalidId)
-        positionSize = QString::number(f->statementCount()).size();
-
-    QString n = f->name ? *f->name : QString();
-    if (n.isEmpty())
-        n.sprintf("%p", f);
-    *out << "function " << n << '(';
-
-    for (int i = 0; i < f->formals.size(); ++i) {
-        if (i != 0)
-            *out << ", ";
-        *out << *f->formals.at(i);
-    }
-    *out << ')' << endl
-        << '{' << endl;
-
-    for (const QString *local : qAsConst(f->locals))
-        *out << "    local var " << *local << endl;
-
-    bool needsSeperator = !f->locals.isEmpty();
-    for (BasicBlock *bb : f->basicBlocks()) {
-        if (bb->isRemoved())
-            continue;
-
-        if (needsSeperator)
-            *out << endl;
-        else
-            needsSeperator = true;
-        print(bb);
-    }
-    *out << '}' << endl;
-}
-
-void IRPrinter::print(BasicBlock *bb)
-{
-    std::swap(currentBB, bb);
-    printBlockStart();
-
-    for (Stmt *s : currentBB->statements()) {
-        if (!s)
-            continue;
-
-        QByteArray str;
-        QBuffer buf(&str);
-        buf.open(QIODevice::WriteOnly);
-        QTextStream os(&buf);
-        QTextStream *prevOut = &os;
-        std::swap(out, prevOut);
-        addStmtNr(s);
-        visit(s);
-        if (s->location.startLine) {
-            out->flush();
-            for (int i = 58 - str.length(); i > 0; --i)
-                *out << ' ';
-            *out << "    ; line: " << s->location.startLine << ", column: " << s->location.startColumn;
-        }
-
-        out->flush();
-        std::swap(out, prevOut);
-
-        *out << "    " << str << endl;
-    }
-
-    std::swap(currentBB, bb);
-}
-
-void IRPrinter::visit(Stmt *s)
-{
-    if (auto e = s->asExp()) {
-        visitExp(e);
-    } else if (auto m = s->asMove()) {
-        visitMove(m);
-    } else if (auto j = s->asJump()) {
-        visitJump(j);
-    } else if (auto c = s->asCJump()) {
-        visitCJump(c);
-    } else if (auto r = s->asRet()) {
-        visitRet(r);
-    } else if (auto p = s->asPhi()) {
-        visitPhi(p);
-    } else {
-        Q_UNREACHABLE();
-    }
-}
-
-void IRPrinter::visitExp(Exp *s)
-{
-    *out << "void ";
-    visit(s->expr);
-}
-
-void IRPrinter::visitMove(Move *s)
-{
-    if (Temp *targetTemp = s->target->asTemp())
-        if (!s->swap && targetTemp->type != UnknownType)
-            *out << typeName(targetTemp->type) << ' ';
-
-    visit(s->target);
-    *out << ' ';
-    if (s->swap)
-        *out << "<=> ";
-    else
-        *out << "= ";
-    visit(s->source);
-}
-
-void IRPrinter::visitJump(Jump *s)
-{
-    *out << "goto L" << s->target->index();
-}
-
-void IRPrinter::visitCJump(CJump *s)
-{
-    *out << "if ";
-    visit(s->cond);
-    *out << " goto L" << s->iftrue->index()
-         << " else goto L" << s->iffalse->index();
-}
-
-void IRPrinter::visitRet(Ret *s)
-{
-    *out << "return";
-    if (s->expr) {
-        *out << ' ';
-        visit(s->expr);
-    }
-}
-
-void IRPrinter::visitPhi(Phi *s)
-{
-    if (s->targetTemp->type != UnknownType)
-        *out << typeName(s->targetTemp->type) << ' ';
-
-    visit(s->targetTemp);
-    *out << " = phi ";
-    for (int i = 0, ei = s->incoming.size(); i < ei; ++i) {
-        if (i > 0)
-            *out << ", ";
-        if (currentBB)
-            *out << 'L' << currentBB->in.at(i)->index() << ": ";
-        if (s->incoming[i])
-            visit(s->incoming[i]);
-    }
-}
-
-void IRPrinter::visit(Expr *e)
-{
-    if (auto c = e->asConst()) {
-        visitConst(c);
-    } else if (auto s = e->asString()) {
-        visitString(s);
-    } else if (auto r = e->asRegExp()) {
-        visitRegExp(r);
-    } else if (auto n = e->asName()) {
-        visitName(n);
-    } else if (auto t = e->asTemp()) {
-        visitTemp(t);
-    } else if (auto a = e->asArgLocal()) {
-        visitArgLocal(a);
-    } else if (auto c = e->asClosure()) {
-        visitClosure(c);
-    } else if (auto c = e->asConvert()) {
-        visitConvert(c);
-    } else if (auto u = e->asUnop()) {
-        visitUnop(u);
-    } else if (auto b = e->asBinop()) {
-        visitBinop(b);
-    } else if (auto c = e->asCall()) {
-        visitCall(c);
-    } else if (auto n = e->asNew()) {
-        visitNew(n);
-    } else if (auto s = e->asSubscript()) {
-        visitSubscript(s);
-    } else if (auto m = e->asMember()) {
-        visitMember(m);
-    } else {
-        Q_UNREACHABLE();
-    }
-}
-
-void IRPrinter::visitConst(Const *e)
-{
-    switch (e->type) {
-    case QV4::IR::UndefinedType:
-        *out << "undefined";
-        break;
-    case QV4::IR::NullType:
-        *out << "null";
-        break;
-    case QV4::IR::BoolType:
-        *out << (e->value ? "true" : "false");
-        break;
-    case QV4::IR::MissingType:
-        *out << "missing";
-        break;
-    default:
-        if (int(e->value) == 0 && int(e->value) == e->value) {
-            if (isNegative(e->value))
-                *out << "-0";
-            else
-                *out << "0";
-        } else {
-            *out << QString::number(e->value, 'g', 16);
-        }
-        break;
-    }
-}
-
-void IRPrinter::visitString(String *e)
-{
-    *out << '"' << escape(*e->value) << '"';
-}
-
-void IRPrinter::visitRegExp(RegExp *e)
-{
-    char f[3];
-    int i = 0;
-    if (e->flags & RegExp::RegExp_Global)
-        f[i++] = 'g';
-    if (e->flags & RegExp::RegExp_IgnoreCase)
-        f[i++] = 'i';
-    if (e->flags & RegExp::RegExp_Multiline)
-        f[i++] = 'm';
-    f[i] = 0;
-
-    *out << '/' << *e->value << '/' << f;
-}
-
-void IRPrinter::visitName(Name *e)
-{
-    if (e->id) {
-        if (*e->id != QLatin1String("this"))
-            *out << '.';
-        *out << *e->id;
-    } else {
-        *out << builtin_to_string(e->builtin);
-    }
-}
-
-void IRPrinter::visitTemp(Temp *e)
-{
-    switch (e->kind) {
-    case Temp::VirtualRegister:  *out << '%' << e->index; break;
-    case Temp::PhysicalRegister: *out << (e->type == DoubleType ? "fp" : "r")
-                                     << e->index; break;
-    case Temp::StackSlot:        *out << '&' << e->index; break;
-    default:                     *out << "INVALID";
-    }
-}
-
-void IRPrinter::visitArgLocal(ArgLocal *e)
-{
-    switch (e->kind) {
-    case ArgLocal::Formal:           *out << '#' << e->index; break;
-    case ArgLocal::ScopedFormal:     *out << '#' << e->index
-                                     << '@' << e->scope; break;
-    case ArgLocal::Local:            *out << '$' << e->index; break;
-    case ArgLocal::ScopedLocal:      *out << '$' << e->index
-                                     << '@' << e->scope; break;
-    default:                     *out << "INVALID";
-    }
-}
-
-void IRPrinter::visitClosure(Closure *e)
-{
-    QString name = e->functionName ? *e->functionName : QString();
-    if (name.isEmpty())
-        name.sprintf("%x", e->value);
-    *out << "closure " << name;
-}
-
-void IRPrinter::visitConvert(Convert *e)
-{
-    *out << "convert " << typeName(e->expr->type) << " to " << typeName(e->type) << ' ';
-    visit(e->expr);
-}
-
-void IRPrinter::visitUnop(Unop *e)
-{
-    *out << opname(e->op) << ' ';
-    visit(e->expr);
-}
-
-void IRPrinter::visitBinop(Binop *e)
-{
-    *out << opname(e->op) << ' ';
-    visit(e->left);
-    *out << ", ";
-    visit(e->right);
-}
-
-void IRPrinter::visitCall(Call *e)
-{
-    *out << "call ";
-    visit(e->base);
-    *out << '(';
-    for (ExprList *it = e->args; it; it = it->next) {
-        if (it != e->args)
-            *out << ", ";
-        visit(it->expr);
-    }
-    *out << ')';
-}
-
-void IRPrinter::visitNew(New *e)
-{
-    *out << "new ";
-    visit(e->base);
-    *out << '(';
-    for (ExprList *it = e->args; it; it = it->next) {
-        if (it != e->args)
-            *out << ", ";
-        visit(it->expr);
-    }
-    *out << ')';
-}
-
-void IRPrinter::visitSubscript(Subscript *e)
-{
-    visit(e->base);
-    *out << '[';
-    visit(e->index);
-    *out << ']';
-}
-
-void IRPrinter::visitMember(Member *e)
-{
-    if (e->kind != Member::MemberOfEnum && e->kind != Member::MemberOfIdObjectsArray
-            && e->attachedPropertiesId != 0 && !e->base->asTemp())
-        *out << "[[attached property from " << e->attachedPropertiesId << "]]";
-    else
-        visit(e->base);
-    *out << '.' << *e->name;
-#ifndef V4_BOOTSTRAP
-    if (e->property)
-        *out << " (meta-property " << e->property->coreIndex()
-            << " <" << QMetaType::typeName(e->property->propType())
-            << ">)";
-    else if (e->kind == Member::MemberOfIdObjectsArray)
-        *out << "(id object " << e->idIndex << ")";
-#endif
-}
-
-QString IRPrinter::escape(const QString &s)
-{
-    QString r;
-    for (int i = 0; i < s.length(); ++i) {
-        const QChar ch = s.at(i);
-        if (ch == QLatin1Char('\n'))
-            r += QLatin1String("\\n");
-        else if (ch == QLatin1Char('\r'))
-            r += QLatin1String("\\r");
-        else if (ch == QLatin1Char('\\'))
-            r += QLatin1String("\\\\");
-        else if (ch == QLatin1Char('"'))
-            r += QLatin1String("\\\"");
-        else if (ch == QLatin1Char('\''))
-            r += QLatin1String("\\'");
-        else
-            r += ch;
-    }
-    return r;
-}
-
-void IRPrinter::addStmtNr(Stmt *s)
-{
-    if (s->id() >= 0)
-        addJustifiedNr(s->id());
-}
-
-void IRPrinter::addJustifiedNr(int pos)
-{
-    if (positionSize == Stmt::InvalidId) {
-        *out << pos << ": ";
-    } else {
-        QString posStr;
-        if (pos != Stmt::InvalidId)
-            posStr = QString::number(pos);
-        *out << posStr.rightJustified(positionSize);
-        if (pos == Stmt::InvalidId)
-            *out << "  ";
-        else
-            *out << ": ";
-    }
-}
-
-void IRPrinter::printBlockStart()
-{
-    if (currentBB->isRemoved()) {
-        *out << "(block has been removed)";
-        return;
-    }
-
-    QByteArray str;
-    str.append('L');
-    str.append(QByteArray::number(currentBB->index()));
-    str.append(':');
-    if (currentBB->catchBlock) {
-        str.append(" (exception handler L");
-        str.append(QByteArray::number(currentBB->catchBlock->index()));
-        str.append(')');
-    }
-    for (int i = 66 - str.length(); i; --i)
-        str.append(' ');
-    *out << str;
-
-    *out << "; predecessors:";
-    for (BasicBlock *in : qAsConst(currentBB->in))
-        *out << " L" << in->index();
-    if (currentBB->in.isEmpty())
-        *out << " none";
-    if (BasicBlock *container = currentBB->containingGroup())
-        *out << ", container: L" << container->index();
-    if (currentBB->isGroupStart())
-        *out << ", loop_header: yes";
-    *out << endl;
-}
-
-} // end of namespace IR
-} // end of namespace QV4
-
-QT_END_NAMESPACE
diff --git a/src/qml/compiler/qv4jsir_p.h b/src/qml/compiler/qv4jsir_p.h
deleted file mode 100644
index 7bdad31260..0000000000
--- a/src/qml/compiler/qv4jsir_p.h
+++ /dev/null
@@ -1,1813 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-#ifndef QV4JSIR_P_H
-#define QV4JSIR_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include "private/qv4global_p.h"
-#include <private/qqmljsmemorypool_p.h>
-#include <private/qqmljsastfwd_p.h>
-#include <private/qflagpointer_p.h>
-#ifndef V4_BOOTSTRAP
-#include <private/qqmlmetatype_p.h>
-#endif
-
-#include <QtCore/private/qnumeric_p.h>
-#include <QtCore/QVector>
-#include <QtCore/QString>
-#include <QtCore/QBitArray>
-#include <QtCore/qurl.h>
-#include <QtCore/QVarLengthArray>
-#include <QtCore/QDateTime>
-#include <qglobal.h>
-
-#if defined(CONST) && defined(Q_OS_WIN)
-# define QT_POP_CONST
-# pragma push_macro("CONST")
-# undef CONST // CONST conflicts with our own identifier
-#endif
-
-QT_BEGIN_NAMESPACE
-
-class QTextStream;
-class QQmlType;
-class QQmlPropertyData;
-class QQmlPropertyCache;
-class QQmlEnginePrivate;
-struct QQmlImportRef;
-class QQmlTypeNameCache;
-
-namespace QV4 {
-
-inline bool isNegative(double d)
-{
-    uchar *dch = (uchar *)&d;
-    if (QSysInfo::ByteOrder == QSysInfo::BigEndian)
-        return (dch[0] & 0x80);
-    else
-        return (dch[7] & 0x80);
-
-}
-
-namespace IR {
-
-struct BasicBlock;
-struct Function;
-struct Module;
-
-struct Stmt;
-struct Expr;
-
-// expressions
-struct Const;
-struct String;
-struct RegExp;
-struct Name;
-struct Temp;
-struct ArgLocal;
-struct Closure;
-struct Convert;
-struct Unop;
-struct Binop;
-struct Call;
-struct New;
-struct Subscript;
-struct Member;
-
-// statements
-struct Exp;
-struct Move;
-struct Jump;
-struct CJump;
-struct Ret;
-struct Phi;
-
-template<class T, int Prealloc>
-class VarLengthArray: public QVarLengthArray<T, Prealloc>
-{
-public:
-    bool removeOne(const T &element)
-    {
-        for (int i = 0; i < this->size(); ++i) {
-            if (this->at(i) == element) {
-                this->remove(i);
-                return true;
-            }
-        }
-
-        return false;
-    }
-};
-
-// Flag pointer:
-// * The first flag indicates whether the meta object is final.
-//   If final, then none of its properties themselves need to
-//   be final when considering for lookups in QML.
-// * The second flag indicates whether enums should be included
-//   in the lookup of properties or not. The default is false.
-typedef QFlagPointer<QQmlPropertyCache> IRMetaObject;
-
-enum AluOp {
-    OpInvalid = 0,
-
-    OpIfTrue,
-    OpNot,
-    OpUMinus,
-    OpUPlus,
-    OpCompl,
-    OpIncrement,
-    OpDecrement,
-
-    OpBitAnd,
-    OpBitOr,
-    OpBitXor,
-
-    OpAdd,
-    OpSub,
-    OpMul,
-    OpDiv,
-    OpMod,
-
-    OpLShift,
-    OpRShift,
-    OpURShift,
-
-    OpGt,
-    OpLt,
-    OpGe,
-    OpLe,
-    OpEqual,
-    OpNotEqual,
-    OpStrictEqual,
-    OpStrictNotEqual,
-
-    OpInstanceof,
-    OpIn,
-
-    OpAnd,
-    OpOr,
-
-    LastAluOp = OpOr
-};
-AluOp binaryOperator(int op);
-const char *opname(IR::AluOp op);
-
-enum Type : quint16 {
-    UnknownType   = 0,
-
-    MissingType   = 1 << 0,
-    UndefinedType = 1 << 1,
-    NullType      = 1 << 2,
-    BoolType      = 1 << 3,
-
-    SInt32Type    = 1 << 4,
-    UInt32Type    = 1 << 5,
-    DoubleType    = 1 << 6,
-    NumberType    = SInt32Type | UInt32Type | DoubleType,
-
-    StringType    = 1 << 7,
-    QObjectType   = 1 << 8,
-    VarType       = 1 << 9
-};
-
-inline bool strictlyEqualTypes(Type t1, Type t2)
-{
-    return t1 == t2 || ((t1 & NumberType) && (t2 & NumberType));
-}
-
-QString typeName(Type t);
-
-struct MemberExpressionResolver;
-
-struct DiscoveredType {
-    int type;
-    MemberExpressionResolver *memberResolver;
-
-    DiscoveredType() : type(UnknownType), memberResolver(0) {}
-    DiscoveredType(Type t) : type(t), memberResolver(0) { Q_ASSERT(type != QObjectType); }
-    explicit DiscoveredType(int t) : type(t), memberResolver(0) { Q_ASSERT(type != QObjectType); }
-    explicit DiscoveredType(MemberExpressionResolver *memberResolver)
-        : type(QObjectType)
-        , memberResolver(memberResolver)
-    { Q_ASSERT(memberResolver); }
-
-    bool test(Type t) const { return type & t; }
-    bool isNumber() const { return (type & NumberType) && !(type & ~NumberType); }
-
-    bool operator!=(Type other) const { return type != other; }
-    bool operator==(Type other) const { return type == other; }
-    bool operator==(const DiscoveredType &other) const { return type == other.type; }
-    bool operator!=(const DiscoveredType &other) const { return type != other.type; }
-};
-
-struct MemberExpressionResolver
-{
-    typedef DiscoveredType (*ResolveFunction)(QQmlEnginePrivate *engine,
-                                              const MemberExpressionResolver *resolver,
-                                              Member *member);
-
-    MemberExpressionResolver()
-        : resolveMember(0), import(nullptr), propertyCache(nullptr), typenameCache(nullptr), owner(nullptr), flags(0) {}
-
-    bool isValid() const { return !!resolveMember; }
-    void clear() { *this = MemberExpressionResolver(); }
-
-    ResolveFunction resolveMember;
-#ifndef V4_BOOTSTRAP
-    QQmlType qmlType;
-#endif
-    const QQmlImportRef *import;
-    QQmlPropertyCache *propertyCache;
-    QQmlTypeNameCache *typenameCache;
-    Function *owner;
-    unsigned int flags;
-};
-
-struct Q_AUTOTEST_EXPORT Expr {
-    enum ExprKind : quint8 {
-        NameExpr,
-        TempExpr,
-        ArgLocalExpr,
-        SubscriptExpr,
-        MemberExpr,
-
-        LastLValue = MemberExpr,
-
-        ConstExpr,
-        StringExpr,
-        RegExpExpr,
-        ClosureExpr,
-        ConvertExpr,
-        UnopExpr,
-        BinopExpr,
-        CallExpr,
-        NewExpr
-    };
-
-    Type type;
-    const ExprKind exprKind;
-
-    Expr &operator=(const Expr &other) {
-        Q_ASSERT(exprKind == other.exprKind);
-        type = other.type;
-        return *this;
-    }
-
-    template <typename To>
-    inline bool isa() const {
-        return To::classof(this);
-    }
-
-    template <typename To>
-    inline To *as() {
-        if (isa<To>()) {
-            return static_cast<To *>(this);
-        } else {
-            return nullptr;
-        }
-    }
-
-    template <typename To>
-    inline const To *as() const {
-        if (isa<To>()) {
-            return static_cast<const To *>(this);
-        } else {
-            return nullptr;
-        }
-    }
-
-    Expr(ExprKind exprKind): type(UnknownType), exprKind(exprKind) {}
-    bool isLValue() const;
-
-    Const *asConst();
-    String *asString();
-    RegExp *asRegExp();
-    Name *asName();
-    Temp *asTemp();
-    ArgLocal *asArgLocal();
-    Closure *asClosure();
-    Convert *asConvert();
-    Unop *asUnop();
-    Binop *asBinop();
-    Call *asCall();
-    New *asNew();
-    Subscript *asSubscript();
-    Member *asMember();
-};
-
-#define EXPR_VISIT_ALL_KINDS(e) \
-    switch (e->exprKind) { \
-    case QV4::IR::Expr::ConstExpr: \
-        break; \
-    case QV4::IR::Expr::StringExpr: \
-        break; \
-    case QV4::IR::Expr::RegExpExpr: \
-        break; \
-    case QV4::IR::Expr::NameExpr: \
-        break; \
-    case QV4::IR::Expr::TempExpr: \
-        break; \
-    case QV4::IR::Expr::ArgLocalExpr: \
-        break; \
-    case QV4::IR::Expr::ClosureExpr: \
-        break; \
-    case QV4::IR::Expr::ConvertExpr: { \
-        auto casted = e->asConvert(); \
-        visit(casted->expr); \
-    } break; \
-    case QV4::IR::Expr::UnopExpr: { \
-        auto casted = e->asUnop(); \
-        visit(casted->expr); \
-    } break; \
-    case QV4::IR::Expr::BinopExpr: { \
-        auto casted = e->asBinop(); \
-        visit(casted->left); \
-        visit(casted->right); \
-    } break; \
-    case QV4::IR::Expr::CallExpr: { \
-        auto casted = e->asCall(); \
-        visit(casted->base); \
-        for (QV4::IR::ExprList *it = casted->args; it; it = it->next) \
-            visit(it->expr); \
-    } break; \
-    case QV4::IR::Expr::NewExpr: { \
-        auto casted = e->asNew(); \
-        visit(casted->base); \
-        for (QV4::IR::ExprList *it = casted->args; it; it = it->next) \
-            visit(it->expr); \
-    } break; \
-    case QV4::IR::Expr::SubscriptExpr: { \
-        auto casted = e->asSubscript(); \
-        visit(casted->base); \
-        visit(casted->index); \
-    } break; \
-    case QV4::IR::Expr::MemberExpr: { \
-        auto casted = e->asMember(); \
-        visit(casted->base); \
-    } break; \
-    }
-
-struct ExprList {
-    Expr *expr;
-    ExprList *next;
-
-    ExprList(): expr(0), next(0) {}
-
-    void init(Expr *expr, ExprList *next = 0)
-    {
-        this->expr = expr;
-        this->next = next;
-    }
-};
-
-struct Const: Expr {
-    double value;
-
-    Const(): Expr(ConstExpr) {}
-
-    void init(Type type, double value)
-    {
-        this->type = type;
-        this->value = value;
-    }
-
-    static bool classof(const Expr *c) { return c->exprKind == ConstExpr; }
-};
-
-struct String: Expr {
-    const QString *value;
-
-    String(): Expr(StringExpr) {}
-
-    void init(const QString *value)
-    {
-        this->value = value;
-    }
-
-    static bool classof(const Expr *c) { return c->exprKind == StringExpr; }
-};
-
-struct RegExp: Expr {
-    // needs to be compatible with the flags in the lexer, and in RegExpObject
-    enum Flags {
-        RegExp_Global     = 0x01,
-        RegExp_IgnoreCase = 0x02,
-        RegExp_Multiline  = 0x04
-    };
-
-    const QString *value;
-    int flags;
-
-    RegExp(): Expr(RegExpExpr) {}
-
-    void init(const QString *value, int flags)
-    {
-        this->value = value;
-        this->flags = flags;
-    }
-
-    static bool classof(const Expr *c) { return c->exprKind == RegExpExpr; }
-};
-
-struct Name: Expr {
-    enum Builtin {
-        builtin_invalid,
-        builtin_typeof,
-        builtin_delete,
-        builtin_throw,
-        builtin_rethrow,
-        builtin_unwind_exception,
-        builtin_push_catch_scope,
-        builtin_foreach_iterator_object,
-        builtin_foreach_next_property_name,
-        builtin_push_with_scope,
-        builtin_pop_scope,
-        builtin_declare_vars,
-        builtin_define_array,
-        builtin_define_object_literal,
-        builtin_setup_argument_object,
-        builtin_convert_this_to_object,
-        builtin_qml_context,
-        builtin_qml_imported_scripts_object
-    };
-
-    const QString *id;
-    Builtin builtin;
-    bool global : 1;
-    bool qmlSingleton : 1;
-    bool freeOfSideEffects : 1;
-    quint32 line;
-    quint32 column;
-
-    Name(): Expr(NameExpr) {}
-
-    void initGlobal(const QString *id, quint32 line, quint32 column);
-    void init(const QString *id, quint32 line, quint32 column);
-    void init(Builtin builtin, quint32 line, quint32 column);
-
-    static bool classof(const Expr *c) { return c->exprKind == NameExpr; }
-};
-
-struct Q_AUTOTEST_EXPORT Temp: Expr {
-    enum Kind {
-        Invalid = 0,
-        VirtualRegister,
-        PhysicalRegister,
-        StackSlot
-    };
-
-    unsigned index      : 28;
-    unsigned isReadOnly :  1;
-    unsigned kind       :  3;
-
-    // Used when temp is used as base in member expression
-    MemberExpressionResolver *memberResolver;
-
-    Temp()
-        : Expr(TempExpr)
-        , index((1 << 28) - 1)
-        , isReadOnly(0)
-        , kind(Invalid)
-        , memberResolver(0)
-    {}
-
-    Temp(Type type, Kind kind, unsigned index)
-        : Expr(TempExpr)
-        , index(index)
-        , isReadOnly(0)
-        , kind(kind)
-        , memberResolver(0)
-    {
-        this->type = type;
-    }
-
-    void init(unsigned kind, unsigned index)
-    {
-        this->index = index;
-        this->isReadOnly = false;
-        this->kind = kind;
-    }
-
-    bool isInvalid() const { return kind == Invalid; }
-
-    static bool classof(const Expr *c) { return c->exprKind == TempExpr; }
-};
-
-inline bool operator==(const Temp &t1, const Temp &t2) Q_DECL_NOTHROW
-{ return t1.index == t2.index && t1.kind == t2.kind && t1.type == t2.type; }
-
-inline bool operator!=(const Temp &t1, const Temp &t2) Q_DECL_NOTHROW
-{ return !(t1 == t2); }
-
-inline uint qHash(const Temp &t, uint seed = 0) Q_DECL_NOTHROW
-{ return t.index ^ t.kind ^ seed; }
-
-bool operator<(const Temp &t1, const Temp &t2) Q_DECL_NOTHROW;
-
-struct Q_AUTOTEST_EXPORT ArgLocal: Expr {
-    enum Kind {
-        Formal = 0,
-        ScopedFormal,
-        Local,
-        ScopedLocal
-    };
-
-    unsigned index;
-    unsigned scope             : 29; // how many scopes outside the current one?
-    unsigned kind              :  2;
-    unsigned isArgumentsOrEval :  1;
-
-    void init(unsigned kind, unsigned index, unsigned scope)
-    {
-        Q_ASSERT((kind == ScopedLocal && scope != 0) ||
-                 (kind == ScopedFormal && scope != 0) ||
-                 (scope == 0));
-
-        this->kind = kind;
-        this->index = index;
-        this->scope = scope;
-        this->isArgumentsOrEval = false;
-    }
-
-    ArgLocal(): Expr(ArgLocalExpr) {}
-
-    bool operator==(const ArgLocal &other) const
-    { return index == other.index && scope == other.scope && kind == other.kind; }
-
-    static bool classof(const Expr *c) { return c->exprKind == ArgLocalExpr; }
-};
-
-struct Closure: Expr {
-    int value; // index in _module->functions
-    const QString *functionName;
-
-    Closure(): Expr(ClosureExpr) {}
-
-    void init(int functionInModule, const QString *functionName)
-    {
-        this->value = functionInModule;
-        this->functionName = functionName;
-    }
-
-    static bool classof(const Expr *c) { return c->exprKind == ClosureExpr; }
-};
-
-struct Convert: Expr {
-    Expr *expr;
-
-    Convert(): Expr(ConvertExpr) {}
-
-    void init(Expr *expr, Type type)
-    {
-        this->expr = expr;
-        this->type = type;
-    }
-
-    static bool classof(const Expr *c) { return c->exprKind == ConvertExpr; }
-};
-
-struct Unop: Expr {
-    Expr *expr;
-    AluOp op;
-
-    Unop(): Expr(UnopExpr) {}
-
-    void init(AluOp op, Expr *expr)
-    {
-        this->op = op;
-        this->expr = expr;
-    }
-
-    static bool classof(const Expr *c) { return c->exprKind == UnopExpr; }
-};
-
-struct Binop: Expr {
-    Expr *left; // Temp or Const
-    Expr *right; // Temp or Const
-    AluOp op;
-
-    Binop(): Expr(BinopExpr) {}
-
-    void init(AluOp op, Expr *left, Expr *right)
-    {
-        this->op = op;
-        this->left = left;
-        this->right = right;
-    }
-
-    static bool classof(const Expr *c) { return c->exprKind == BinopExpr; }
-};
-
-struct Call: Expr {
-    Expr *base; // Name, Member, Temp
-    ExprList *args; // List of Temps
-
-    Call(): Expr(CallExpr) {}
-
-    void init(Expr *base, ExprList *args)
-    {
-        this->base = base;
-        this->args = args;
-    }
-
-    Expr *onlyArgument() const {
-        if (args && ! args->next)
-            return args->expr;
-        return 0;
-    }
-
-    static bool classof(const Expr *c) { return c->exprKind == CallExpr; }
-};
-
-struct New: Expr {
-    Expr *base; // Name, Member, Temp
-    ExprList *args; // List of Temps
-
-    New(): Expr(NewExpr) {}
-
-    void init(Expr *base, ExprList *args)
-    {
-        this->base = base;
-        this->args = args;
-    }
-
-    Expr *onlyArgument() const {
-        if (args && ! args->next)
-            return args->expr;
-        return 0;
-    }
-
-    static bool classof(const Expr *c) { return c->exprKind == NewExpr; }
-};
-
-struct Subscript: Expr {
-    Expr *base;
-    Expr *index;
-
-    Subscript(): Expr(SubscriptExpr) {}
-
-    void init(Expr *base, Expr *index)
-    {
-        this->base = base;
-        this->index = index;
-    }
-
-    static bool classof(const Expr *c) { return c->exprKind == SubscriptExpr; }
-};
-
-struct Member: Expr {
-    // Used for property dependency tracking
-    enum MemberKind {
-        UnspecifiedMember,
-        MemberOfEnum,
-        MemberOfQmlScopeObject,
-        MemberOfQmlContextObject,
-        MemberOfIdObjectsArray,
-        MemberOfSingletonObject,
-    };
-
-    Expr *base;
-    const QString *name;
-    QQmlPropertyData *property;
-    union {  // depending on kind
-        int attachedPropertiesId;
-        int enumValue;
-        int idIndex;
-    };
-    uchar freeOfSideEffects : 1;
-
-    // This is set for example for for QObject properties. All sorts of extra behavior
-    // is defined when writing to them, for example resettable properties are reset
-    // when writing undefined to them, and an exception is thrown when they're missing
-    // a reset function. And then there's also Qt.binding().
-    uchar inhibitTypeConversionOnWrite: 1;
-
-    uchar kind: 3; // MemberKind
-
-    Member(): Expr(MemberExpr) {}
-
-    void setEnumValue(int value) {
-        kind = MemberOfEnum;
-        enumValue = value;
-    }
-
-    void setAttachedPropertiesId(int id) {
-        Q_ASSERT(kind != MemberOfEnum && kind != MemberOfIdObjectsArray);
-        attachedPropertiesId = id;
-    }
-
-    void init(Expr *base, const QString *name, QQmlPropertyData *property = 0, uchar kind = UnspecifiedMember, int index = 0)
-    {
-        this->base = base;
-        this->name = name;
-        this->property = property;
-        this->idIndex = index;
-        this->freeOfSideEffects = false;
-        this->inhibitTypeConversionOnWrite = property != 0;
-        this->kind = kind;
-    }
-
-    static bool classof(const Expr *c) { return c->exprKind == MemberExpr; }
-};
-
-inline bool Expr::isLValue() const {
-    if (auto t = as<Temp>())
-        return !t->isReadOnly;
-    return exprKind <= LastLValue;
-}
-
-struct Stmt {
-    enum StmtKind: quint8 {
-        MoveStmt,
-        ExpStmt,
-        JumpStmt,
-        CJumpStmt,
-        RetStmt,
-        PhiStmt
-    };
-
-    template <typename To>
-    inline bool isa() const {
-        return To::classof(this);
-    }
-
-    template <typename To>
-    inline To *as() {
-        if (isa<To>())
-            return static_cast<To *>(this);
-        else
-            return nullptr;
-    }
-
-    enum { InvalidId = -1 };
-
-    QQmlJS::AST::SourceLocation location;
-
-    explicit Stmt(int id, StmtKind stmtKind): _id(id), stmtKind(stmtKind) {}
-
-    Stmt *asTerminator();
-
-    Exp *asExp();
-    Move *asMove();
-    Jump *asJump();
-    CJump *asCJump();
-    Ret *asRet();
-    Phi *asPhi();
-
-    int id() const { return _id; }
-
-private: // For memory management in BasicBlock
-    friend struct BasicBlock;
-
-private:
-    friend struct Function;
-    int _id;
-
-public:
-    const StmtKind stmtKind;
-};
-
-#define STMT_VISIT_ALL_KINDS(s) \
-    switch (s->stmtKind) { \
-    case QV4::IR::Stmt::MoveStmt: { \
-        auto casted = s->asMove(); \
-        visit(casted->target); \
-        visit(casted->source); \
-    } break; \
-    case QV4::IR::Stmt::ExpStmt: { \
-        auto casted = s->asExp(); \
-        visit(casted->expr); \
-    } break; \
-    case QV4::IR::Stmt::JumpStmt: \
-        break; \
-    case QV4::IR::Stmt::CJumpStmt: { \
-        auto casted = s->asCJump(); \
-        visit(casted->cond); \
-    } break; \
-    case QV4::IR::Stmt::RetStmt: { \
-        auto casted = s->asRet(); \
-        visit(casted->expr); \
-    } break; \
-    case QV4::IR::Stmt::PhiStmt: { \
-        auto casted = s->asPhi(); \
-        visit(casted->targetTemp); \
-        for (auto *e : casted->incoming) { \
-            visit(e); \
-        } \
-    } break; \
-    }
-
-struct Exp: Stmt {
-    Expr *expr;
-
-    Exp(int id): Stmt(id, ExpStmt) {}
-
-    void init(Expr *expr)
-    {
-        this->expr = expr;
-    }
-
-    static bool classof(const Stmt *c) { return c->stmtKind == ExpStmt; }
-};
-
-struct Move: Stmt {
-    Expr *target; // LHS - Temp, Name, Member or Subscript
-    Expr *source;
-    bool swap;
-
-    Move(int id): Stmt(id, MoveStmt) {}
-
-    void init(Expr *target, Expr *source)
-    {
-        this->target = target;
-        this->source = source;
-        this->swap = false;
-    }
-
-    static bool classof(const Stmt *c) { return c->stmtKind == MoveStmt; }
-};
-
-struct Jump: Stmt {
-    BasicBlock *target;
-
-    Jump(int id): Stmt(id, JumpStmt) {}
-
-    void init(BasicBlock *target)
-    {
-        this->target = target;
-    }
-
-    static bool classof(const Stmt *c) { return c->stmtKind == JumpStmt; }
-};
-
-struct CJump: Stmt {
-    Expr *cond; // Temp, Binop
-    BasicBlock *iftrue;
-    BasicBlock *iffalse;
-    BasicBlock *parent;
-
-    CJump(int id): Stmt(id, CJumpStmt) {}
-
-    void init(Expr *cond, BasicBlock *iftrue, BasicBlock *iffalse, BasicBlock *parent)
-    {
-        this->cond = cond;
-        this->iftrue = iftrue;
-        this->iffalse = iffalse;
-        this->parent = parent;
-    }
-
-    static bool classof(const Stmt *c) { return c->stmtKind == CJumpStmt; }
-};
-
-struct Ret: Stmt {
-    Expr *expr;
-
-    Ret(int id): Stmt(id, RetStmt) {}
-
-    void init(Expr *expr)
-    {
-        this->expr = expr;
-    }
-
-    static bool classof(const Stmt *c) { return c->stmtKind == RetStmt; }
-};
-
-// Phi nodes can only occur at the start of a basic block. If there are any, they need to be
-// subsequent to eachother, and the first phi node should be the first statement in the basic-block.
-// A number of loops rely on this behavior, so they don't need to walk through the whole list
-// of instructions in a basic-block (e.g. the calls to destroyData in BasicBlock::~BasicBlock).
-struct Phi: Stmt {
-    Temp *targetTemp;
-    VarLengthArray<Expr *, 4> incoming;
-
-    Phi(int id): Stmt(id, PhiStmt) {}
-
-    static bool classof(const Stmt *c) { return c->stmtKind == PhiStmt; }
-
-    void destroyData()
-    { incoming.~VarLengthArray(); }
-};
-
-inline Stmt *Stmt::asTerminator()
-{
-    if (auto s = asJump()) {
-        return s;
-    } else if (auto s = asCJump()) {
-        return s;
-    } else if (auto s = asRet()) {
-        return s;
-    } else {
-        return nullptr;
-    }
-}
-
-struct Q_QML_PRIVATE_EXPORT Module {
-    QQmlJS::MemoryPool pool;
-    QVector<Function *> functions;
-    Function *rootFunction;
-    QString fileName;
-    QDateTime sourceTimeStamp;
-    bool isQmlModule; // implies rootFunction is always 0
-    uint unitFlags; // flags merged into CompiledData::Unit::flags
-    QString targetABI; // fallback to QSysInfo::buildAbi() if empty
-#if !QT_CONFIG(qml_debug)
-    static const bool debugMode = false;
-#else
-    bool debugMode;
-#endif
-
-    Function *newFunction(const QString &name, Function *outer);
-
-    Module(bool debugMode)
-        : rootFunction(0)
-        , isQmlModule(false)
-        , unitFlags(0)
-#if QT_CONFIG(qml_debug)
-        , debugMode(debugMode)
-    {}
-#else
-    { Q_UNUSED(debugMode); }
-#endif
-    ~Module();
-
-    void setFileName(const QString &name);
-};
-
-struct BasicBlock {
-private:
-    Q_DISABLE_COPY(BasicBlock)
-
-public:
-    typedef VarLengthArray<BasicBlock *, 4> IncomingEdges;
-    typedef VarLengthArray<BasicBlock *, 2> OutgoingEdges;
-
-    Function *function;
-    BasicBlock *catchBlock;
-    IncomingEdges in;
-    OutgoingEdges out;
-    QQmlJS::AST::SourceLocation nextLocation;
-
-    BasicBlock(Function *function, BasicBlock *catcher)
-        : function(function)
-        , catchBlock(catcher)
-        , _containingGroup(0)
-        , _index(-1)
-        , _isExceptionHandler(false)
-        , _groupStart(false)
-        , _isRemoved(false)
-    {}
-
-    ~BasicBlock()
-    {
-        for (Stmt *s : qAsConst(_statements)) {
-            if (Phi *p = s->asPhi()) {
-                p->destroyData();
-            } else {
-                break;
-            }
-        }
-    }
-
-    const QVector<Stmt *> &statements() const
-    {
-        Q_ASSERT(!isRemoved());
-        return _statements;
-    }
-
-    int statementCount() const
-    {
-        Q_ASSERT(!isRemoved());
-        return _statements.size();
-    }
-
-    void setStatements(const QVector<Stmt *> &newStatements);
-
-    template <typename Instr> inline Instr i(Instr i)
-    {
-        Q_ASSERT(!isRemoved());
-        appendStatement(i);
-        return i;
-    }
-
-    void appendStatement(Stmt *statement)
-    {
-        Q_ASSERT(!isRemoved());
-        if (nextLocation.startLine)
-            statement->location = nextLocation;
-        _statements.append(statement);
-    }
-
-    void prependStatement(Stmt *stmt)
-    {
-        Q_ASSERT(!isRemoved());
-        _statements.prepend(stmt);
-    }
-
-    void prependStatements(const QVector<Stmt *> &stmts)
-    {
-        Q_ASSERT(!isRemoved());
-        QVector<Stmt *> newStmts = stmts;
-        newStmts += _statements;
-        _statements = newStmts;
-    }
-
-    void insertStatementBefore(Stmt *before, Stmt *newStmt)
-    {
-        int idx = _statements.indexOf(before);
-        Q_ASSERT(idx >= 0);
-        _statements.insert(idx, newStmt);
-    }
-
-    void insertStatementBefore(int index, Stmt *newStmt)
-    {
-        Q_ASSERT(index >= 0);
-        _statements.insert(index, newStmt);
-    }
-
-    void insertStatementBeforeTerminator(Stmt *stmt)
-    {
-        Q_ASSERT(!isRemoved());
-        _statements.insert(_statements.size() - 1, stmt);
-    }
-
-    void replaceStatement(int index, Stmt *newStmt)
-    {
-        Q_ASSERT(!isRemoved());
-        if (Phi *p = _statements[index]->asPhi()) {
-            p->destroyData();
-        }
-        _statements[index] = newStmt;
-    }
-
-    void removeStatement(Stmt *stmt)
-    {
-        Q_ASSERT(!isRemoved());
-        if (Phi *p = stmt->asPhi()) {
-            p->destroyData();
-        }
-        _statements.remove(_statements.indexOf(stmt));
-    }
-
-    void removeStatement(int idx)
-    {
-        Q_ASSERT(!isRemoved());
-        if (Phi *p = _statements[idx]->asPhi()) {
-            p->destroyData();
-        }
-        _statements.remove(idx);
-    }
-
-    inline bool isEmpty() const {
-        Q_ASSERT(!isRemoved());
-        return _statements.isEmpty();
-    }
-
-    inline Stmt *terminator() const {
-        Q_ASSERT(!isRemoved());
-        if (! _statements.isEmpty() && _statements.last()->asTerminator() != 0)
-            return _statements.last();
-        return 0;
-    }
-
-    inline bool isTerminated() const {
-        Q_ASSERT(!isRemoved());
-        if (terminator() != 0)
-            return true;
-        return false;
-    }
-
-    enum TempForWhom {
-        NewTempForCodegen,
-        NewTempForOptimizer
-    };
-    unsigned newTemp(TempForWhom tfw = NewTempForCodegen);
-
-    Temp *TEMP(unsigned kind);
-    ArgLocal *ARG(unsigned index, unsigned scope);
-    ArgLocal *LOCAL(unsigned index, unsigned scope);
-
-    Expr *CONST(Type type, double value);
-    Expr *STRING(const QString *value);
-    Expr *REGEXP(const QString *value, int flags);
-
-    Name *NAME(const QString &id, quint32 line, quint32 column);
-    Name *NAME(Name::Builtin builtin, quint32 line, quint32 column);
-
-    Name *GLOBALNAME(const QString &id, quint32 line, quint32 column);
-
-    Closure *CLOSURE(int functionInModule);
-
-    Expr *CONVERT(Expr *expr, Type type);
-    Expr *UNOP(AluOp op, Expr *expr);
-    Expr *BINOP(AluOp op, Expr *left, Expr *right);
-    Expr *CALL(Expr *base, ExprList *args = 0);
-    Expr *NEW(Expr *base, ExprList *args = 0);
-    Expr *SUBSCRIPT(Expr *base, Expr *index);
-    Expr *MEMBER(Expr *base, const QString *name, QQmlPropertyData *property = 0, uchar kind = Member::UnspecifiedMember, int attachedPropertiesIdOrEnumValue = 0);
-
-    Stmt *EXP(Expr *expr);
-
-    Stmt *MOVE(Expr *target, Expr *source);
-
-    Stmt *JUMP(BasicBlock *target);
-    Stmt *CJUMP(Expr *cond, BasicBlock *iftrue, BasicBlock *iffalse);
-    Stmt *RET(Expr *expr);
-
-    BasicBlock *containingGroup() const
-    {
-        Q_ASSERT(!isRemoved());
-        return _containingGroup;
-    }
-
-    void setContainingGroup(BasicBlock *loopHeader)
-    {
-        Q_ASSERT(!isRemoved());
-        _containingGroup = loopHeader;
-    }
-
-    bool isGroupStart() const
-    {
-        Q_ASSERT(!isRemoved());
-        return _groupStart;
-    }
-
-    void markAsGroupStart(bool mark = true)
-    {
-        Q_ASSERT(!isRemoved());
-        _groupStart = mark;
-    }
-
-    // Returns the index of the basic-block.
-    // See Function for the full description.
-    int index() const
-    {
-        Q_ASSERT(!isRemoved());
-        return _index;
-    }
-
-    bool isExceptionHandler() const
-    { return _isExceptionHandler; }
-
-    void setExceptionHandler(bool onoff)
-    { _isExceptionHandler = onoff; }
-
-    bool isRemoved() const
-    { return _isRemoved; }
-
-private: // For Function's eyes only.
-    friend struct Function;
-    void setIndex(int index)
-    {
-        Q_ASSERT(_index < 0);
-        changeIndex(index);
-    }
-
-    void changeIndex(int index)
-    {
-        Q_ASSERT(index >= 0);
-        _index = index;
-    }
-
-    void markAsRemoved()
-    {
-        _isRemoved = true;
-        _index = -1;
-    }
-
-private:
-    QVector<Stmt *> _statements;
-    BasicBlock *_containingGroup;
-    int _index;
-    unsigned _isExceptionHandler : 1;
-    unsigned _groupStart : 1;
-    unsigned _isRemoved : 1;
-};
-
-template <typename T>
-class SmallSet: public QVarLengthArray<T, 8>
-{
-public:
-    void insert(int value)
-    {
-        for (auto it : *this) {
-            if (it == value)
-                return;
-        }
-        this->append(value);
-    }
-};
-
-// Map from meta property index (existence implies dependency) to notify signal index
-struct KeyValuePair
-{
-    quint32 _key;
-    quint32 _value;
-
-    KeyValuePair(): _key(0), _value(0) {}
-    KeyValuePair(quint32 key, quint32 value): _key(key), _value(value) {}
-
-    quint32 key() const { return _key; }
-    quint32 value() const { return _value; }
-};
-
-class PropertyDependencyMap: public QVarLengthArray<KeyValuePair, 8>
-{
-public:
-    void insert(quint32 key, quint32 value)
-    {
-        for (auto it = begin(), eit = end(); it != eit; ++it) {
-            if (it->_key == key) {
-                it->_value = value;
-                return;
-            }
-        }
-        append(KeyValuePair(key, value));
-    }
-};
-
-// The Function owns (manages), among things, a list of basic-blocks. All the blocks have an index,
-// which corresponds to the index in the entry/index in the vector in which they are stored. This
-// means that algorithms/classes can also store any information about a basic block in an array,
-// where the index corresponds to the index of the basic block, which can then be used to query
-// the function for a pointer to a basic block. This also means that basic-blocks cannot be removed
-// or renumbered.
-//
-// Note that currently there is one exception: after optimization and block scheduling, the
-// method setScheduledBlocks can be called once, to register a newly ordered list. For debugging
-// purposes, these blocks are not immediately renumbered, so renumberBasicBlocks should be called
-// immediately after changing the order. That will restore the property of having a corresponding
-// block-index and block-position-in-basicBlocks-vector.
-//
-// In order for optimization/transformation passes to skip uninteresting basic blocks that will be
-// removed, the block can be marked as such. After doing so, any access will result in a failing
-// assertion.
-struct Function {
-    Module *module;
-    QQmlJS::MemoryPool *pool;
-    const QString *name;
-    int currentTemp = 0;
-    int tempCount;
-    int maxNumberOfArguments;
-    QSet<QString> strings;
-    QList<const QString *> formals;
-    QList<const QString *> locals;
-    QVector<Function *> nestedFunctions;
-    Function *outer;
-
-    int insideWithOrCatch;
-
-    uint hasDirectEval: 1;
-    uint usesArgumentsObject : 1;
-    uint usesThis : 1;
-    uint isStrict: 1;
-    uint isNamedExpression : 1;
-    uint hasTry: 1;
-    uint hasWith: 1;
-    uint isQmlBinding: 1;
-    uint unused : 24;
-
-    // Location of declaration in source code (0 if not specified)
-    uint line;
-    uint column;
-
-    // Qml extension:
-    SmallSet<int> idObjectDependencies;
-    PropertyDependencyMap contextObjectPropertyDependencies;
-    PropertyDependencyMap scopeObjectPropertyDependencies;
-
-    template <typename T> T *New() { return new (pool->allocate(sizeof(T))) T(); }
-    template <typename T> T *NewStmt() {
-        return new (pool->allocate(sizeof(T))) T(getNewStatementId());
-    }
-
-    Function(Module *module, Function *outer, const QString &name);
-    ~Function();
-
-    enum BasicBlockInsertMode {
-        InsertBlock,
-        DontInsertBlock
-    };
-
-    BasicBlock *newBasicBlock(BasicBlock *catchBlock, BasicBlockInsertMode mode = InsertBlock);
-    const QString *newString(const QString &text);
-
-    void RECEIVE(const QString &name) { formals.append(newString(name)); }
-    void LOCAL(const QString &name) { locals.append(newString(name)); }
-
-    BasicBlock *addBasicBlock(BasicBlock *block);
-    void removeBasicBlock(BasicBlock *block);
-
-    const QVector<BasicBlock *> &basicBlocks() const
-    { return _basicBlocks; }
-
-    BasicBlock *basicBlock(int idx) const
-    { return _basicBlocks.at(idx); }
-
-    int basicBlockCount() const
-    { return _basicBlocks.size(); }
-
-    int liveBasicBlocksCount() const;
-
-    void removeSharedExpressions();
-
-    int indexOfArgument(const QStringRef &string) const;
-
-    bool variablesCanEscape() const
-    { return hasDirectEval || !nestedFunctions.isEmpty() || module->debugMode; }
-
-    void setScheduledBlocks(const QVector<BasicBlock *> &scheduled);
-
-    int getNewStatementId() { return _statementCount++; }
-    int statementCount() const { return _statementCount; }
-
-    bool canUseSimpleCall() const {
-        return nestedFunctions.isEmpty() &&
-               locals.isEmpty() && formals.size() <= QV4::Global::ReservedArgumentCount &&
-               !hasTry && !hasWith && !isNamedExpression && !usesArgumentsObject && !hasDirectEval;
-    }
-
-    bool argLocalRequiresWriteBarrier(ArgLocal *al) const {
-        uint scope = al->scope;
-        const IR::Function *f = this;
-        while (scope) {
-            f = f->outer;
-            --scope;
-        }
-        return !f->canUseSimpleCall();
-    }
-    int localsCountForScope(ArgLocal *al) const {
-        uint scope = al->scope;
-        const IR::Function *f = this;
-        while (scope) {
-            f = f->outer;
-            --scope;
-        }
-        return f->locals.size();
-    }
-
-private:
-    BasicBlock *getOrCreateBasicBlock(int index);
-    void setStatementCount(int cnt);
-
-private:
-    QVector<BasicBlock *> _basicBlocks;
-    QVector<BasicBlock *> *_allBasicBlocks;
-    int _statementCount;
-};
-
-class CloneExpr
-{
-public:
-    explicit CloneExpr(IR::BasicBlock *block = 0);
-
-    void setBasicBlock(IR::BasicBlock *block);
-
-    template <typename ExprSubclass>
-    ExprSubclass *operator()(ExprSubclass *expr)
-    {
-        return clone(expr);
-    }
-
-    template <typename ExprSubclass>
-    ExprSubclass *clone(ExprSubclass *expr)
-    {
-        Expr *c = expr;
-        qSwap(cloned, c);
-        visit(expr);
-        qSwap(cloned, c);
-        return static_cast<ExprSubclass *>(c);
-    }
-
-    static Const *cloneConst(Const *c, Function *f)
-    {
-        Const *newConst = f->New<Const>();
-        newConst->init(c->type, c->value);
-        return newConst;
-    }
-
-    static Name *cloneName(Name *n, Function *f)
-    {
-        Name *newName = f->New<Name>();
-        newName->type = n->type;
-        newName->id = n->id;
-        newName->builtin = n->builtin;
-        newName->global = n->global;
-        newName->qmlSingleton = n->qmlSingleton;
-        newName->freeOfSideEffects = n->freeOfSideEffects;
-        newName->line = n->line;
-        newName->column = n->column;
-        return newName;
-    }
-
-    static Temp *cloneTemp(Temp *t, Function *f)
-    {
-        Temp *newTemp = f->New<Temp>();
-        newTemp->init(t->kind, t->index);
-        newTemp->type = t->type;
-        newTemp->memberResolver = t->memberResolver;
-        return newTemp;
-    }
-
-    static ArgLocal *cloneArgLocal(ArgLocal *argLocal, Function *f)
-    {
-        ArgLocal *newArgLocal = f->New<ArgLocal>();
-        newArgLocal->init(argLocal->kind, argLocal->index, argLocal->scope);
-        newArgLocal->type = argLocal->type;
-        newArgLocal->isArgumentsOrEval = argLocal->isArgumentsOrEval;
-        return newArgLocal;
-    }
-
-private:
-    IR::ExprList *clone(IR::ExprList *list);
-
-    void visit(Expr *e);
-
-protected:
-    IR::BasicBlock *block;
-
-private:
-    IR::Expr *cloned;
-};
-
-class Q_AUTOTEST_EXPORT IRPrinter
-{
-public:
-    IRPrinter(QTextStream *out);
-    virtual ~IRPrinter();
-
-    void print(Stmt *s);
-    void print(Expr *e);
-    void print(const Expr &e);
-
-    virtual void print(Function *f);
-    virtual void print(BasicBlock *bb);
-
-    void visit(Stmt *s);
-    virtual void visitExp(Exp *s);
-    virtual void visitMove(Move *s);
-    virtual void visitJump(Jump *s);
-    virtual void visitCJump(CJump *s);
-    virtual void visitRet(Ret *s);
-    virtual void visitPhi(Phi *s);
-
-    void visit(Expr *e);
-    virtual void visitConst(Const *e);
-    virtual void visitString(String *e);
-    virtual void visitRegExp(RegExp *e);
-    virtual void visitName(Name *e);
-    virtual void visitTemp(Temp *e);
-    virtual void visitArgLocal(ArgLocal *e);
-    virtual void visitClosure(Closure *e);
-    virtual void visitConvert(Convert *e);
-    virtual void visitUnop(Unop *e);
-    virtual void visitBinop(Binop *e);
-    virtual void visitCall(Call *e);
-    virtual void visitNew(New *e);
-    virtual void visitSubscript(Subscript *e);
-    virtual void visitMember(Member *e);
-
-    static QString escape(const QString &s);
-
-protected:
-    virtual void addStmtNr(Stmt *s);
-    void addJustifiedNr(int pos);
-    void printBlockStart();
-
-protected:
-    QTextStream *out;
-    int positionSize;
-    BasicBlock *currentBB;
-};
-
-inline unsigned BasicBlock::newTemp(TempForWhom tfw)
-{
-    Q_ASSERT(!isRemoved());
-
-    if (tfw == NewTempForOptimizer)
-        return function->tempCount++;
-
-    int t = function->currentTemp++;
-    if (function->tempCount < function->currentTemp)
-        function->tempCount = function->currentTemp;
-    return t;
-}
-
-inline Temp *BasicBlock::TEMP(unsigned index)
-{
-    Q_ASSERT(!isRemoved());
-    Temp *e = function->New<Temp>();
-    e->init(Temp::VirtualRegister, index);
-    return e;
-}
-
-inline ArgLocal *BasicBlock::ARG(unsigned index, unsigned scope)
-{
-    Q_ASSERT(!isRemoved());
-    ArgLocal *e = function->New<ArgLocal>();
-    e->init(scope ? ArgLocal::ScopedFormal : ArgLocal::Formal, index, scope);
-    return e;
-}
-
-inline ArgLocal *BasicBlock::LOCAL(unsigned index, unsigned scope)
-{
-    Q_ASSERT(!isRemoved());
-    ArgLocal *e = function->New<ArgLocal>();
-    e->init(scope ? ArgLocal::ScopedLocal : ArgLocal::Local, index, scope);
-    return e;
-}
-
-inline Expr *BasicBlock::CONST(Type type, double value)
-{
-    Q_ASSERT(!isRemoved());
-    Const *e = function->New<Const>();
-    if (type == NumberType) {
-        int ival = (int)value;
-        // +0 != -0, so we need to convert to double when negating 0
-        if (ival == value && !(value == 0 && isNegative(value)))
-            type = SInt32Type;
-        else
-            type = DoubleType;
-    } else if (type == NullType) {
-        value = 0;
-    } else if (type == UndefinedType) {
-        value = qt_qnan();
-    }
-
-    e->init(type, value);
-    return e;
-}
-
-inline Expr *BasicBlock::STRING(const QString *value)
-{
-    Q_ASSERT(!isRemoved());
-    String *e = function->New<String>();
-    e->init(value);
-    return e;
-}
-
-inline Expr *BasicBlock::REGEXP(const QString *value, int flags)
-{
-    Q_ASSERT(!isRemoved());
-    RegExp *e = function->New<RegExp>();
-    e->init(value, flags);
-    return e;
-}
-
-inline Name *BasicBlock::NAME(const QString &id, quint32 line, quint32 column)
-{
-    Q_ASSERT(!isRemoved());
-    Name *e = function->New<Name>();
-    e->init(function->newString(id), line, column);
-    return e;
-}
-
-inline Name *BasicBlock::GLOBALNAME(const QString &id, quint32 line, quint32 column)
-{
-    Q_ASSERT(!isRemoved());
-    Name *e = function->New<Name>();
-    e->initGlobal(function->newString(id), line, column);
-    return e;
-}
-
-
-inline Name *BasicBlock::NAME(Name::Builtin builtin, quint32 line, quint32 column)
-{
-    Q_ASSERT(!isRemoved());
-    Name *e = function->New<Name>();
-    e->init(builtin, line, column);
-    return e;
-}
-
-inline Closure *BasicBlock::CLOSURE(int functionInModule)
-{
-    Q_ASSERT(!isRemoved());
-    Closure *clos = function->New<Closure>();
-    clos->init(functionInModule, function->module->functions.at(functionInModule)->name);
-    return clos;
-}
-
-inline Expr *BasicBlock::CONVERT(Expr *expr, Type type)
-{
-    Q_ASSERT(!isRemoved());
-    Convert *e = function->New<Convert>();
-    e->init(expr, type);
-    return e;
-}
-
-inline Expr *BasicBlock::UNOP(AluOp op, Expr *expr)
-{
-    Q_ASSERT(!isRemoved());
-    Unop *e = function->New<Unop>();
-    e->init(op, expr);
-    return e;
-}
-
-inline Expr *BasicBlock::BINOP(AluOp op, Expr *left, Expr *right)
-{
-    Q_ASSERT(!isRemoved());
-    Binop *e = function->New<Binop>();
-    e->init(op, left, right);
-    return e;
-}
-
-inline Expr *BasicBlock::CALL(Expr *base, ExprList *args)
-{
-    Q_ASSERT(!isRemoved());
-    Call *e = function->New<Call>();
-    e->init(base, args);
-    int argc = 0;
-    for (ExprList *it = args; it; it = it->next)
-        ++argc;
-    function->maxNumberOfArguments = qMax(function->maxNumberOfArguments, argc);
-    return e;
-}
-
-inline Expr *BasicBlock::NEW(Expr *base, ExprList *args)
-{
-    Q_ASSERT(!isRemoved());
-    New *e = function->New<New>();
-    e->init(base, args);
-    return e;
-}
-
-inline Expr *BasicBlock::SUBSCRIPT(Expr *base, Expr *index)
-{
-    Q_ASSERT(!isRemoved());
-    Subscript *e = function->New<Subscript>();
-    e->init(base, index);
-    return e;
-}
-
-inline Expr *BasicBlock::MEMBER(Expr *base, const QString *name, QQmlPropertyData *property, uchar kind, int attachedPropertiesIdOrEnumValue)
-{
-    Q_ASSERT(!isRemoved());
-    Member*e = function->New<Member>();
-    e->init(base, name, property, kind, attachedPropertiesIdOrEnumValue);
-    return e;
-}
-
-inline Stmt *BasicBlock::EXP(Expr *expr)
-{
-    Q_ASSERT(!isRemoved());
-    if (isTerminated())
-        return 0;
-
-    Exp *s = function->NewStmt<Exp>();
-    s->init(expr);
-    appendStatement(s);
-    return s;
-}
-
-inline Stmt *BasicBlock::MOVE(Expr *target, Expr *source)
-{
-    Q_ASSERT(!isRemoved());
-    if (isTerminated())
-        return 0;
-
-    Move *s = function->NewStmt<Move>();
-    s->init(target, source);
-    appendStatement(s);
-    return s;
-}
-
-inline Stmt *BasicBlock::JUMP(BasicBlock *target)
-{
-    Q_ASSERT(!isRemoved());
-    if (isTerminated())
-        return 0;
-
-    Jump *s = function->NewStmt<Jump>();
-    s->init(target);
-    appendStatement(s);
-
-    Q_ASSERT(! out.contains(target));
-    out.append(target);
-
-    Q_ASSERT(! target->in.contains(this));
-    target->in.append(this);
-
-    return s;
-}
-
-inline Stmt *BasicBlock::CJUMP(Expr *cond, BasicBlock *iftrue, BasicBlock *iffalse)
-{
-    Q_ASSERT(!isRemoved());
-    if (isTerminated())
-        return 0;
-
-    if (iftrue == iffalse) {
-        MOVE(TEMP(newTemp()), cond);
-        return JUMP(iftrue);
-    }
-
-    CJump *s = function->NewStmt<CJump>();
-    s->init(cond, iftrue, iffalse, this);
-    appendStatement(s);
-
-    Q_ASSERT(! out.contains(iftrue));
-    out.append(iftrue);
-
-    Q_ASSERT(! iftrue->in.contains(this));
-    iftrue->in.append(this);
-
-    Q_ASSERT(! out.contains(iffalse));
-    out.append(iffalse);
-
-    Q_ASSERT(! iffalse->in.contains(this));
-    iffalse->in.append(this);
-
-    return s;
-}
-
-inline Stmt *BasicBlock::RET(Expr *expr)
-{
-    Q_ASSERT(!isRemoved());
-    if (isTerminated())
-        return 0;
-
-    Ret *s = function->NewStmt<Ret>();
-    s->init(expr);
-    appendStatement(s);
-    return s;
-}
-
-inline Const *Expr::asConst() { return as<Const>(); }
-inline String *Expr::asString() { return as<String>(); }
-inline RegExp *Expr::asRegExp() { return as<RegExp>(); }
-inline Name *Expr::asName() { return as<Name>(); }
-inline Temp *Expr::asTemp() { return as<Temp>(); }
-inline ArgLocal *Expr::asArgLocal() { return as<ArgLocal>(); }
-inline Closure *Expr::asClosure() { return as<Closure>(); }
-inline Convert *Expr::asConvert() { return as<Convert>(); }
-inline Unop *Expr::asUnop() { return as<Unop>(); }
-inline Binop *Expr::asBinop() { return as<Binop>(); }
-inline Call *Expr::asCall() { return as<Call>(); }
-inline New *Expr::asNew() { return as<New>(); }
-inline Subscript *Expr::asSubscript() { return as<Subscript>(); }
-inline Member *Expr::asMember() { return as<Member>(); }
-
-inline Exp *Stmt::asExp() { return as<Exp>(); }
-inline Move *Stmt::asMove() { return as<Move>(); }
-inline Jump *Stmt::asJump() { return as<Jump>(); }
-inline CJump *Stmt::asCJump() { return as<CJump>(); }
-inline Ret *Stmt::asRet() { return as<Ret>(); }
-inline Phi *Stmt::asPhi() { return as<Phi>(); }
-
-} // end of namespace IR
-
-} // end of namespace QV4
-
-QT_END_NAMESPACE
-
-#if defined(QT_POP_CONST)
-# pragma pop_macro("CONST") // Restore peace
-# undef QT_POP_CONST
-#endif
-
-#endif // QV4IR_P_H
diff --git a/src/qml/compiler/qv4ssa.cpp b/src/qml/compiler/qv4ssa.cpp
deleted file mode 100644
index cf79168c6c..0000000000
--- a/src/qml/compiler/qv4ssa.cpp
+++ /dev/null
@@ -1,5848 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-// When building with debug code, the macro below will enable debug helpers when using libc++.
-// For example, the std::vector<T>::operator[] will use _LIBCPP_ASSERT to check if the index is
-// within the array bounds. Note that this only works reliably with OSX 10.9 or later.
-//#define _LIBCPP_DEBUG2 2
-
-#include "qv4ssa_p.h"
-#include "qv4isel_util_p.h"
-#include "qv4util_p.h"
-
-#include <QtCore/QBuffer>
-#include <QtCore/QCoreApplication>
-#include <QtCore/QStringList>
-#include <QtCore/QSet>
-#include <QtCore/QLinkedList>
-#include <QtCore/QStack>
-#include <qv4runtime_p.h>
-#include <cmath>
-#include <iostream>
-#include <cassert>
-
-QT_USE_NAMESPACE
-
-using namespace QV4;
-using namespace IR;
-
-namespace {
-
-enum { DebugMoveMapping = 0 };
-
-#ifdef QT_NO_DEBUG
-enum { DoVerification = 0 };
-#else
-enum { DoVerification = 1 };
-#endif
-
-static void showMeTheCode(IR::Function *function, const char *marker)
-{
-    static const bool showCode = qEnvironmentVariableIsSet("QV4_SHOW_IR");
-    if (showCode) {
-        qDebug() << marker;
-        QBuffer buf;
-        buf.open(QIODevice::WriteOnly);
-        QTextStream stream(&buf);
-        IRPrinter(&stream).print(function);
-        stream << endl;
-        qDebug("%s", buf.data().constData());
-    }
-}
-
-class ProcessedBlocks
-{
-    BitVector processed;
-
-public:
-    ProcessedBlocks(IR::Function *function)
-        : processed(function->basicBlockCount(), false)
-    {}
-
-    bool alreadyProcessed(BasicBlock *bb) const
-    {
-        Q_ASSERT(bb);
-
-        return processed.at(bb->index());
-    }
-
-    void markAsProcessed(BasicBlock *bb)
-    {
-        processed.setBit(bb->index());
-    }
-};
-
-class BasicBlockSet
-{
-    typedef BitVector Flags;
-
-    QVarLengthArray<int, 8> blockNumbers;
-    Flags *blockFlags;
-    IR::Function *function;
-    enum { MaxVectorCapacity = 8 };
-
-public:
-    class const_iterator
-    {
-        const BasicBlockSet &set;
-        // ### These two members could go into a union, but clang won't compile (https://codereview.qt-project.org/#change,74259)
-        QVarLengthArray<int, 8>::const_iterator numberIt;
-        int flagIt;
-
-        friend class BasicBlockSet;
-        const_iterator(const BasicBlockSet &set, bool end)
-            : set(set)
-        {
-            if (end || !set.function) {
-                if (!set.blockFlags)
-                    numberIt = set.blockNumbers.end();
-                else
-                    flagIt = set.blockFlags->size();
-            } else {
-                if (!set.blockFlags)
-                    numberIt = set.blockNumbers.begin();
-                else
-                    findNextWithFlags(0);
-            }
-        }
-
-        void findNextWithFlags(int start)
-        {
-            flagIt = set.blockFlags->findNext(start, true, /*wrapAround = */false);
-            Q_ASSERT(flagIt <= set.blockFlags->size());
-        }
-
-    public:
-        BasicBlock *operator*() const
-        {
-            if (!set.blockFlags) {
-                return set.function->basicBlock(*numberIt);
-            } else {
-                Q_ASSERT(flagIt <= set.function->basicBlockCount());
-                return set.function->basicBlock(flagIt);
-            }
-        }
-
-        bool operator==(const const_iterator &other) const
-        {
-            if (&set != &other.set)
-                return false;
-            if (!set.blockFlags)
-                return numberIt == other.numberIt;
-            else
-                return flagIt == other.flagIt;
-        }
-
-        bool operator!=(const const_iterator &other) const
-        { return !(*this == other); }
-
-        const_iterator &operator++()
-        {
-            if (!set.blockFlags)
-                ++numberIt;
-            else
-                findNextWithFlags(flagIt + 1);
-
-            return *this;
-        }
-    };
-
-    friend class const_iterator;
-
-public:
-    BasicBlockSet(IR::Function *f = 0): blockFlags(0), function(0)
-    {
-        if (f)
-            init(f);
-    }
-
-#ifdef Q_COMPILER_RVALUE_REFS
-    BasicBlockSet(BasicBlockSet &&other): blockFlags(0)
-    {
-        std::swap(blockNumbers, other.blockNumbers);
-        std::swap(blockFlags, other.blockFlags);
-        std::swap(function, other.function);
-    }
-#endif // Q_COMPILER_RVALUE_REFS
-
-    BasicBlockSet(const BasicBlockSet &other)
-        : blockFlags(0)
-        , function(other.function)
-    {
-        if (other.blockFlags)
-            blockFlags = new Flags(*other.blockFlags);
-        blockNumbers = other.blockNumbers;
-    }
-
-    BasicBlockSet &operator=(const BasicBlockSet &other)
-    {
-        if (blockFlags) {
-            delete blockFlags;
-            blockFlags = 0;
-        }
-        function = other.function;
-        if (other.blockFlags)
-            blockFlags = new Flags(*other.blockFlags);
-        blockNumbers = other.blockNumbers;
-        return *this;
-    }
-
-    ~BasicBlockSet()
-    {
-        delete blockFlags;
-    }
-
-    void init(IR::Function *f)
-    {
-        Q_ASSERT(!function);
-        Q_ASSERT(f);
-        function = f;
-    }
-
-    bool empty() const
-    {
-        return begin() == end();
-    }
-
-    void insert(BasicBlock *bb)
-    {
-        Q_ASSERT(function);
-
-        if (blockFlags) {
-            blockFlags->setBit(bb->index());
-            return;
-        }
-
-        for (int i = 0; i < blockNumbers.size(); ++i) {
-            if (blockNumbers[i] == bb->index())
-                return;
-        }
-
-        if (blockNumbers.size() == MaxVectorCapacity) {
-            blockFlags = new Flags(function->basicBlockCount(), false);
-            for (int i = 0; i < blockNumbers.size(); ++i) {
-                blockFlags->setBit(blockNumbers[i]);
-            }
-            blockNumbers.clear();
-            blockFlags->setBit(bb->index());
-        } else {
-            blockNumbers.append(bb->index());
-        }
-    }
-
-    void remove(BasicBlock *bb)
-    {
-        Q_ASSERT(function);
-
-        if (blockFlags) {
-            blockFlags->clearBit(bb->index());
-            return;
-        }
-
-        for (int i = 0; i < blockNumbers.size(); ++i) {
-            if (blockNumbers[i] == bb->index()) {
-                blockNumbers.remove(i);
-                return;
-            }
-        }
-    }
-
-    const_iterator begin() const { return const_iterator(*this, false); }
-    const_iterator end() const { return const_iterator(*this, true); }
-
-    void collectValues(std::vector<BasicBlock *> &bbs) const
-    {
-        Q_ASSERT(function);
-
-        for (const_iterator it = begin(), eit = end(); it != eit; ++it)
-            bbs.push_back(*it);
-    }
-
-    bool contains(BasicBlock *bb) const
-    {
-        Q_ASSERT(function);
-
-        if (blockFlags)
-            return blockFlags->at(bb->index());
-
-        for (int i = 0; i < blockNumbers.size(); ++i) {
-            if (blockNumbers[i] == bb->index())
-                return true;
-        }
-
-        return false;
-    }
-};
-
-class DominatorTree
-{
-    enum {
-        DebugDominatorFrontiers = 0,
-        DebugImmediateDominators = 0,
-
-        DebugCodeCanUseLotsOfCpu = 0
-    };
-
-    typedef int BasicBlockIndex;
-    enum { InvalidBasicBlockIndex = -1 };
-
-    struct Data
-    {
-        int N;
-        std::vector<int> dfnum; // BasicBlock index -> dfnum
-        std::vector<int> vertex;
-        std::vector<BasicBlockIndex> parent; // BasicBlock index -> parent BasicBlock index
-        std::vector<BasicBlockIndex> ancestor; // BasicBlock index -> ancestor BasicBlock index
-        std::vector<BasicBlockIndex> best; // BasicBlock index -> best BasicBlock index
-        std::vector<BasicBlockIndex> semi; // BasicBlock index -> semi dominator BasicBlock index
-        std::vector<BasicBlockIndex> samedom; // BasicBlock index -> same dominator BasicBlock index
-
-        Data(): N(0) {}
-    };
-
-    IR::Function *function;
-    QScopedPointer<Data> d;
-    std::vector<BasicBlockIndex> idom; // BasicBlock index -> immediate dominator BasicBlock index
-    std::vector<BasicBlockSet> DF; // BasicBlock index -> dominator frontier
-
-    struct DFSTodo {
-        BasicBlockIndex node, parent;
-
-        DFSTodo()
-            : node(InvalidBasicBlockIndex)
-            , parent(InvalidBasicBlockIndex)
-        {}
-
-        DFSTodo(BasicBlockIndex node, BasicBlockIndex parent)
-            : node(node)
-            , parent(parent)
-        {}
-    };
-
-    void DFS(BasicBlockIndex node) {
-        std::vector<DFSTodo> worklist;
-        worklist.reserve(d->vertex.capacity() / 2);
-        DFSTodo todo(node, InvalidBasicBlockIndex);
-
-        while (true) {
-            BasicBlockIndex n = todo.node;
-
-            if (d->dfnum[n] == 0) {
-                d->dfnum[n] = d->N;
-                d->vertex[d->N] = n;
-                d->parent[n] = todo.parent;
-                ++d->N;
-                const BasicBlock::OutgoingEdges &out = function->basicBlock(n)->out;
-                for (int i = out.size() - 1; i > 0; --i)
-                    worklist.push_back(DFSTodo(out[i]->index(), n));
-
-                if (out.size() > 0) {
-                    todo.node = out.first()->index();
-                    todo.parent = n;
-                    continue;
-                }
-            }
-
-            if (worklist.empty())
-                break;
-
-            todo = worklist.back();
-            worklist.pop_back();
-        }
-    }
-
-    BasicBlockIndex ancestorWithLowestSemi(BasicBlockIndex v, std::vector<BasicBlockIndex> &worklist) {
-        worklist.clear();
-        for (BasicBlockIndex it = v; it != InvalidBasicBlockIndex; it = d->ancestor[it])
-            worklist.push_back(it);
-
-        if (worklist.size() < 2)
-            return d->best[v];
-
-        BasicBlockIndex b = InvalidBasicBlockIndex;
-        BasicBlockIndex last = worklist.back();
-        Q_ASSERT(worklist.size() <= INT_MAX);
-        for (int it = static_cast<int>(worklist.size()) - 2; it >= 0; --it) {
-            BasicBlockIndex bbIt = worklist[it];
-            d->ancestor[bbIt] = last;
-            BasicBlockIndex &best_it = d->best[bbIt];
-            if (b != InvalidBasicBlockIndex && d->dfnum[d->semi[b]] < d->dfnum[d->semi[best_it]])
-                best_it = b;
-            else
-                b = best_it;
-        }
-        return b;
-    }
-
-    void link(BasicBlockIndex p, BasicBlockIndex n) {
-        d->ancestor[n] = p;
-        d->best[n] = n;
-    }
-
-    void calculateIDoms() {
-        Q_ASSERT(function->basicBlock(0)->in.isEmpty());
-
-        const int bbCount = function->basicBlockCount();
-        d->vertex = std::vector<int>(bbCount, InvalidBasicBlockIndex);
-        d->parent = std::vector<int>(bbCount, InvalidBasicBlockIndex);
-        d->dfnum = std::vector<int>(size_t(bbCount), 0);
-        d->semi = std::vector<BasicBlockIndex>(bbCount, InvalidBasicBlockIndex);
-        d->ancestor = std::vector<BasicBlockIndex>(bbCount, InvalidBasicBlockIndex);
-        idom = std::vector<BasicBlockIndex>(bbCount, InvalidBasicBlockIndex);
-        d->samedom = std::vector<BasicBlockIndex>(bbCount, InvalidBasicBlockIndex);
-        d->best = std::vector<BasicBlockIndex>(bbCount, InvalidBasicBlockIndex);
-
-        QHash<BasicBlockIndex, std::vector<BasicBlockIndex> > bucket;
-        bucket.reserve(bbCount);
-
-        DFS(function->basicBlock(0)->index());
-        Q_ASSERT(d->N == function->liveBasicBlocksCount());
-
-        std::vector<BasicBlockIndex> worklist;
-        worklist.reserve(d->vertex.capacity() / 2);
-
-        for (int i = d->N - 1; i > 0; --i) {
-            BasicBlockIndex n = d->vertex[i];
-            BasicBlockIndex p = d->parent[n];
-            BasicBlockIndex s = p;
-
-            for (BasicBlock *v : function->basicBlock(n)->in) {
-                BasicBlockIndex ss = InvalidBasicBlockIndex;
-                if (d->dfnum[v->index()] <= d->dfnum[n])
-                    ss = v->index();
-                else
-                    ss = d->semi[ancestorWithLowestSemi(v->index(), worklist)];
-                if (d->dfnum[ss] < d->dfnum[s])
-                    s = ss;
-            }
-            d->semi[n] = s;
-            bucket[s].push_back(n);
-            link(p, n);
-            if (bucket.contains(p)) {
-                for (BasicBlockIndex v : bucket[p]) {
-                    BasicBlockIndex y = ancestorWithLowestSemi(v, worklist);
-                    BasicBlockIndex semi_v = d->semi[v];
-                    if (d->semi[y] == semi_v)
-                        idom[v] = semi_v;
-                    else
-                        d->samedom[v] = y;
-                }
-                bucket.remove(p);
-            }
-        }
-
-        for (int i = 1; i < d->N; ++i) {
-            BasicBlockIndex n = d->vertex[i];
-            Q_ASSERT(n != InvalidBasicBlockIndex);
-            Q_ASSERT(!bucket.contains(n));
-            Q_ASSERT(d->ancestor[n] != InvalidBasicBlockIndex
-                        && ((d->semi[n] != InvalidBasicBlockIndex
-                                && d->dfnum[d->ancestor[n]] <= d->dfnum[d->semi[n]]) || d->semi[n] == n));
-            BasicBlockIndex sdn = d->samedom[n];
-            if (sdn != InvalidBasicBlockIndex)
-                idom[n] = idom[sdn];
-        }
-
-        dumpImmediateDominators();
-    }
-
-    struct NodeProgress {
-        std::vector<BasicBlockIndex> children;
-        std::vector<BasicBlockIndex> todo;
-    };
-
-public:
-    DominatorTree(IR::Function *function)
-        : function(function)
-        , d(new Data)
-    {
-        calculateIDoms();
-        d.reset();
-    }
-
-    void computeDF() {
-        DF.resize(function->basicBlockCount());
-
-        // compute children of each node in the dominator tree
-        std::vector<std::vector<BasicBlockIndex> > children; // BasicBlock index -> children
-        children.resize(function->basicBlockCount());
-        for (BasicBlock *n : function->basicBlocks()) {
-            if (n->isRemoved())
-                continue;
-            const BasicBlockIndex nodeIndex = n->index();
-            Q_ASSERT(function->basicBlock(nodeIndex) == n);
-            const BasicBlockIndex nodeDominator = idom[nodeIndex];
-            if (nodeDominator == InvalidBasicBlockIndex)
-                continue; // there is no dominator to add this node to as a child (e.g. the start node)
-            children[nodeDominator].push_back(nodeIndex);
-        }
-
-        // Fill the worklist and initialize the node status for each basic-block
-        std::vector<NodeProgress> nodeStatus;
-        nodeStatus.resize(function->basicBlockCount());
-        std::vector<BasicBlockIndex> worklist;
-        worklist.reserve(function->basicBlockCount());
-        for (BasicBlock *bb : function->basicBlocks()) {
-            if (bb->isRemoved())
-                continue;
-            BasicBlockIndex nodeIndex = bb->index();
-            worklist.push_back(nodeIndex);
-            NodeProgress &np = nodeStatus[nodeIndex];
-            np.children = children[nodeIndex];
-            np.todo = children[nodeIndex];
-        }
-
-        BitVector DF_done(function->basicBlockCount(), false);
-
-        while (!worklist.empty()) {
-            BasicBlockIndex node = worklist.back();
-
-            if (DF_done.at(node)) {
-                worklist.pop_back();
-                continue;
-            }
-
-            NodeProgress &np = nodeStatus[node];
-            std::vector<BasicBlockIndex>::iterator it = np.todo.begin();
-            while (it != np.todo.end()) {
-                if (DF_done.at(*it)) {
-                    it = np.todo.erase(it);
-                } else {
-                    worklist.push_back(*it);
-                    break;
-                }
-            }
-
-            if (np.todo.empty()) {
-                BasicBlockSet &S = DF[node];
-                S.init(function);
-                for (BasicBlock *y : function->basicBlock(node)->out)
-                    if (idom[y->index()] != node)
-                        S.insert(y);
-                for (BasicBlockIndex child : np.children) {
-                    const BasicBlockSet &ws = DF[child];
-                    for (BasicBlockSet::const_iterator it = ws.begin(), eit = ws.end(); it != eit; ++it) {
-                        BasicBlock *w = *it;
-                        const BasicBlockIndex wIndex = w->index();
-                        if (node == wIndex || !dominates(node, w->index()))
-                            S.insert(w);
-                    }
-                }
-                DF_done.setBit(node);
-                worklist.pop_back();
-            }
-        }
-
-        if (DebugDominatorFrontiers) {
-            QBuffer buf;
-            buf.open(QIODevice::WriteOnly);
-            QTextStream qout(&buf);
-            qout << "Dominator Frontiers:" << endl;
-            for (BasicBlock *n : function->basicBlocks()) {
-                if (n->isRemoved())
-                    continue;
-
-                qout << "\tDF[" << n->index() << "]: {";
-                const BasicBlockSet &SList = DF[n->index()];
-                for (BasicBlockSet::const_iterator i = SList.begin(), ei = SList.end(); i != ei; ++i) {
-                    if (i != SList.begin())
-                        qout << ", ";
-                    qout << (*i)->index();
-                }
-                qout << "}" << endl;
-            }
-            qDebug("%s", buf.data().constData());
-        }
-
-        if (DebugDominatorFrontiers && DebugCodeCanUseLotsOfCpu) {
-            for (BasicBlock *n : function->basicBlocks()) {
-                if (n->isRemoved())
-                    continue;
-                const BasicBlockSet &fBlocks = DF[n->index()];
-                for (BasicBlockSet::const_iterator it = fBlocks.begin(), eit = fBlocks.end(); it != eit; ++it) {
-                    BasicBlock *fBlock = *it;
-                    Q_ASSERT(!dominates(n, fBlock) || fBlock == n);
-                    bool hasDominatedSucc = false;
-                    for (BasicBlock *succ : fBlock->in) {
-                        if (dominates(n, succ)) {
-                            hasDominatedSucc = true;
-                            break;
-                        }
-                    }
-                    if (!hasDominatedSucc) {
-                        qDebug("%d in DF[%d] has no dominated predecessors", fBlock->index(), n->index());
-                    }
-                    Q_ASSERT(hasDominatedSucc);
-                }
-            }
-        }
-    }
-
-    const BasicBlockSet &dominatorFrontier(BasicBlock *n) const {
-        return DF[n->index()];
-    }
-
-    BasicBlock *immediateDominator(BasicBlock *bb) const {
-        const BasicBlockIndex idx = idom[bb->index()];
-        if (idx == -1)
-            return 0;
-        return function->basicBlock(idx);
-    }
-
-    void dumpImmediateDominators() const
-    {
-        if (DebugImmediateDominators) {
-            QBuffer buf;
-            buf.open(QIODevice::WriteOnly);
-            QTextStream qout(&buf);
-            qout << "Immediate dominators:" << endl;
-            for (BasicBlock *to : function->basicBlocks()) {
-                if (to->isRemoved())
-                    continue;
-
-                qout << '\t';
-                BasicBlockIndex from = idom.at(to->index());
-                if (from != InvalidBasicBlockIndex)
-                    qout << from;
-                else
-                    qout << "(none)";
-                qout << " dominates " << to->index() << endl;
-            }
-            qDebug("%s", buf.data().constData());
-        }
-    }
-
-    void setImmediateDominator(BasicBlock *bb, BasicBlock *newDominator)
-    {
-        Q_ASSERT(bb->index() >= 0);
-        Q_ASSERT(!newDominator || newDominator->index() >= 0);
-
-        if (static_cast<std::vector<BasicBlockIndex>::size_type>(bb->index()) >= idom.size()) {
-            // This is a new block, probably introduced by edge splitting. So, we'll have to grow
-            // the array before inserting the immediate dominator.
-            idom.resize(function->basicBlockCount(), InvalidBasicBlockIndex);
-        }
-
-        const BasicBlockIndex newIdx = newDominator ? newDominator->index() : InvalidBasicBlockIndex;
-        if (DebugImmediateDominators)
-            qDebug() << "Setting idom of" << bb->index() << "from" << idom[bb->index()] << "to" << newIdx;
-        idom[bb->index()] = newIdx;
-    }
-
-    void collectSiblings(BasicBlock *node, BasicBlockSet &siblings)
-    {
-        siblings.insert(node);
-        const BasicBlockIndex dominator = idom[node->index()];
-        if (dominator == InvalidBasicBlockIndex)
-            return;
-        for (size_t i = 0, ei = idom.size(); i != ei; ++i) {
-            if (idom[i] == dominator) {
-                BasicBlock *bb = function->basicBlock(int(i));
-                if (!bb->isRemoved())
-                    siblings.insert(bb);
-            }
-        }
-    }
-
-    void recalculateIDoms(const BasicBlockSet &nodes, BasicBlock *limit = 0)
-    {
-        const BasicBlockIndex limitIndex = limit ? limit->index() : InvalidBasicBlockIndex;
-        BasicBlockSet todo(nodes), postponed(function);
-        while (!todo.empty())
-            recalculateIDom(*todo.begin(), todo, postponed, limitIndex);
-    }
-
-    bool dominates(BasicBlock *dominator, BasicBlock *dominated) const {
-        return dominates(dominator->index(), dominated->index());
-    }
-
-    struct Cmp {
-        std::vector<int> *nodeDepths;
-        Cmp(std::vector<int> *nodeDepths)
-            : nodeDepths(nodeDepths)
-            { Q_ASSERT(nodeDepths); }
-        bool operator()(BasicBlock *one, BasicBlock *two) const
-            {
-                if (one->isRemoved())
-                    return false;
-                if (two->isRemoved())
-                    return true;
-                return nodeDepths->at(one->index()) > nodeDepths->at(two->index());
-            }
-    };
-
-    // Calculate a depth-first iteration order on the nodes of the dominator tree.
-    //
-    // The order of the nodes in the vector is not the same as one where a recursive depth-first
-    // iteration is done on a tree. Rather, the nodes are (reverse) sorted on tree depth.
-    // So for the:
-    //    1 dominates 2
-    //    2 dominates 3
-    //    3 dominates 4
-    //    2 dominates 5
-    // the order will be:
-    //    4, 3, 5, 2, 1
-    // or:
-    //    4, 5, 3, 2, 1
-    // So the order of nodes on the same depth is undefined, but it will be after the nodes
-    // they dominate, and before the nodes that dominate them.
-    //
-    // The reason for this order is that a proper DFS pre-/post-order would require inverting
-    // the idom vector by either building a real tree datastructure or by searching the idoms
-    // for siblings and children. Both have a higher time complexity than sorting by depth.
-    QVector<BasicBlock *> calculateDFNodeIterOrder() const
-    {
-        std::vector<int> depths = calculateNodeDepths();
-        QVector<BasicBlock *> order = function->basicBlocks();
-        std::sort(order.begin(), order.end(), Cmp(&depths));
-        for (int i = 0; i < order.size(); ) {
-            if (order[i]->isRemoved())
-                order.remove(i);
-            else
-                ++i;
-        }
-        return order;
-    }
-
-    void mergeIntoPredecessor(BasicBlock *successor)
-    {
-        int succIdx = successor->index();
-        if (succIdx == InvalidBasicBlockIndex) {
-            return;
-        }
-
-        int succDom = idom[unsigned(succIdx)];
-        for (BasicBlockIndex &idx : idom) {
-            if (idx == succIdx) {
-                idx = succDom;
-            }
-        }
-    }
-
-private:
-    bool dominates(BasicBlockIndex dominator, BasicBlockIndex dominated) const {
-        // dominator can be Invalid when the dominated block has no dominator (i.e. the start node)
-        Q_ASSERT(dominated != InvalidBasicBlockIndex);
-
-        if (dominator == dominated)
-            return false;
-
-        for (BasicBlockIndex it = idom[dominated]; it != InvalidBasicBlockIndex; it = idom[it]) {
-            if (it == dominator)
-                return true;
-        }
-
-        return false;
-    }
-
-    // Algorithm:
-    //  - for each node:
-    //    - get the depth of a node. If it's unknown (-1):
-    //      - get the depth of the immediate dominator.
-    //      - if that's unknown too, calculate it by calling calculateNodeDepth
-    //      - set the current node's depth to that of immediate dominator + 1
-    std::vector<int> calculateNodeDepths() const
-    {
-        std::vector<int> nodeDepths(size_t(function->basicBlockCount()), -1);
-        nodeDepths[0] = 0;
-        for (BasicBlock *bb : function->basicBlocks()) {
-            if (bb->isRemoved())
-                continue;
-
-            int &bbDepth = nodeDepths[bb->index()];
-            if (bbDepth == -1) {
-                const int immDom = idom[bb->index()];
-                int immDomDepth = nodeDepths[immDom];
-                if (immDomDepth == -1)
-                    immDomDepth = calculateNodeDepth(immDom, nodeDepths);
-                bbDepth = immDomDepth + 1;
-            }
-        }
-        return nodeDepths;
-    }
-
-    // Algorithm:
-    //   - search for the first dominator of a node that has a known depth. As all nodes are
-    //     reachable from the start node, and that node's depth is 0, this is finite.
-    //   - while doing that search, put all unknown nodes in the worklist
-    //   - pop all nodes from the worklist, and set their depth to the previous' (== dominating)
-    //     node's depth + 1
-    // This way every node's depth is calculated once, and the complexity is O(n).
-    int calculateNodeDepth(int nodeIdx, std::vector<int> &nodeDepths) const
-    {
-        std::vector<int> worklist;
-        worklist.reserve(8);
-        int depth = -1;
-
-        do {
-            worklist.push_back(nodeIdx);
-            nodeIdx = idom[nodeIdx];
-            depth = nodeDepths[nodeIdx];
-        } while (depth == -1);
-
-        for (std::vector<int>::const_reverse_iterator it = worklist.rbegin(), eit = worklist.rend(); it != eit; ++it)
-            nodeDepths[*it] = ++depth;
-
-        return depth;
-    }
-
-    // The immediate-dominator recalculation is used when edges are removed from the CFG. See
-    // [Ramalingam] for a description. Note that instead of calculating the priority, a recursive
-    // algorithm is used: when recalculating the immediate dominator of a node by looking for the
-    // least-common ancestor, and a node is hit that also needs recalculation, a recursive call
-    // is done to calculate that nodes immediate dominator first.
-    //
-    // Note that this simplified algorithm cannot cope with back-edges. It only works for
-    // non-looping edges (which is our use-case).
-    void recalculateIDom(BasicBlock *node, BasicBlockSet &todo, BasicBlockSet &postponed, BasicBlockIndex limit) {
-        Q_ASSERT(!postponed.contains(node));
-        Q_ASSERT(todo.contains(node));
-        todo.remove(node);
-
-        if (node->in.size() == 1) {
-            // Special case: if the node has only one incoming edge, then that is the immediate
-            // dominator.
-            setImmediateDominator(node, node->in.first());
-            return;
-        }
-
-        std::vector<BasicBlockIndex> prefix;
-        prefix.reserve(32);
-
-        for (BasicBlock *in : node->in) {
-            if (node == in) // back-edge to self
-                continue;
-            if (dominates(node->index(), in->index())) // a known back-edge
-                continue;
-
-            if (prefix.empty()) {
-                calculatePrefix(node, in, prefix, todo, postponed, limit);
-
-                if (!prefix.empty()) {
-                    std::reverse(prefix.begin(), prefix.end());
-                    Q_ASSERT(!prefix.empty());
-                    Q_ASSERT(prefix.front() == limit || limit == InvalidBasicBlockIndex);
-                }
-            } else {
-                std::vector<BasicBlockIndex> anotherPrefix;
-                anotherPrefix.reserve(prefix.size());
-                calculatePrefix(node, in, anotherPrefix, todo, postponed, limit);
-
-                if (!anotherPrefix.empty())
-                    commonPrefix(prefix, anotherPrefix);
-            }
-        }
-
-        Q_ASSERT(!prefix.empty());
-        idom[node->index()] = prefix.back();
-    }
-
-    void calculatePrefix(BasicBlock *node, BasicBlock *in, std::vector<BasicBlockIndex> &prefix, BasicBlockSet &todo, BasicBlockSet &postponed, BasicBlockIndex limit)
-    {
-        for (BasicBlockIndex it = in->index(); it != InvalidBasicBlockIndex; it = idom[it]) {
-            prefix.push_back(it);
-            if (it == limit)
-                return;
-            BasicBlock *n = function->basicBlock(it);
-            if (postponed.contains(n)) { // possible back-edge, bail out.
-                prefix.clear();
-                return;
-            }
-            if (todo.contains(n)) {
-                postponed.insert(node);
-                recalculateIDom(n, todo, postponed, limit);
-                postponed.remove(node);
-            }
-        }
-    }
-
-    // Calculate the LCA (Least Common Ancestor) by finding the longest common prefix between two
-    // dominator chains. Note that "anotherPrefix" has the node's immediate dominator first, while
-    // "bestPrefix" has it last (meaning: is in reverse order). The reason for this is that removing
-    // nodes from "bestPrefix" is cheaper because it's done at the end of the vector, while
-    // reversing all "anotherPrefix" nodes would take unnecessary time.
-    static void commonPrefix(std::vector<BasicBlockIndex> &bestPrefix, const std::vector<BasicBlockIndex> &anotherPrefix)
-    {
-        const size_t anotherSize = anotherPrefix.size();
-        size_t minLen = qMin(bestPrefix.size(), anotherPrefix.size());
-        while (minLen != 0) {
-            --minLen;
-            if (bestPrefix[minLen] == anotherPrefix[anotherSize - minLen - 1]) {
-                ++minLen;
-                break;
-            }
-        }
-        if (minLen != bestPrefix.size())
-            bestPrefix.erase(bestPrefix.begin() + minLen, bestPrefix.end());
-    }
-};
-
-class VariableCollector {
-    std::vector<Temp> _allTemps;
-    std::vector<BasicBlockSet> _defsites;
-    std::vector<std::vector<int> > A_orig;
-    BitVector nonLocals;
-    BitVector killed;
-
-    BasicBlock *currentBB;
-    bool isCollectable(Temp *t) const
-    {
-        Q_UNUSED(t);
-        Q_ASSERT(t->kind != Temp::PhysicalRegister && t->kind != Temp::StackSlot);
-        return true;
-    }
-
-    void addDefInCurrentBlock(Temp *t)
-    {
-        std::vector<int> &temps = A_orig[currentBB->index()];
-        if (std::find(temps.begin(), temps.end(), t->index) == temps.end())
-            temps.push_back(t->index);
-    }
-
-    void addTemp(Temp *t)
-    {
-        if (_allTemps[t->index].kind == Temp::Invalid)
-            _allTemps[t->index] = *t;
-    }
-
-public:
-    VariableCollector(IR::Function *function)
-    {
-        _allTemps.resize(function->tempCount);
-        _defsites.resize(function->tempCount);
-        for (int i = 0; i < function->tempCount; ++i)
-            _defsites[i].init(function);
-        nonLocals.resize(function->tempCount);
-        const size_t ei = function->basicBlockCount();
-        A_orig.resize(ei);
-        for (size_t i = 0; i != ei; ++i)
-            A_orig[i].reserve(8);
-
-        for (BasicBlock *bb : function->basicBlocks()) {
-            if (bb->isRemoved())
-                continue;
-
-            currentBB = bb;
-            killed.assign(function->tempCount, false);
-            for (Stmt *s : bb->statements())
-                visit(s);
-        }
-    }
-
-    const std::vector<Temp> &allTemps() const
-    { return _allTemps; }
-
-    void collectDefSites(const Temp &n, std::vector<BasicBlock *> &bbs) const {
-        Q_ASSERT(!n.isInvalid());
-        Q_ASSERT(n.index < _defsites.size());
-        _defsites[n.index].collectValues(bbs);
-    }
-
-    const std::vector<int> &inBlock(BasicBlock *n) const
-    {
-        return A_orig.at(n->index());
-    }
-
-    bool isNonLocal(const Temp &var) const
-    {
-        Q_ASSERT(!var.isInvalid());
-        Q_ASSERT(static_cast<int>(var.index) < nonLocals.size());
-        return nonLocals.at(var.index);
-    }
-
-private:
-    void visit(Stmt *s)
-    {
-        if (s->asPhi()) {
-            // nothing to do
-        } else if (auto move = s->asMove()) {
-            visit(move->source);
-
-            if (Temp *t = move->target->asTemp()) {
-                addTemp(t);
-
-                if (isCollectable(t)) {
-                    _defsites[t->index].insert(currentBB);
-                    addDefInCurrentBlock(t);
-
-                    // For semi-pruned SSA:
-                    killed.setBit(t->index);
-                }
-            } else {
-                visit(move->target);
-            }
-        } else {
-            STMT_VISIT_ALL_KINDS(s)
-        }
-    }
-
-    void visit(Expr *e)
-    {
-        if (auto t = e->asTemp()) {
-            addTemp(t);
-
-            if (isCollectable(t)) {
-                if (!killed.at(t->index)) {
-                    nonLocals.setBit(t->index);
-                }
-            }
-        } else {
-            EXPR_VISIT_ALL_KINDS(e);
-        }
-    }
-};
-
-struct UntypedTemp {
-    Temp temp;
-    UntypedTemp() {}
-    UntypedTemp(const Temp &t): temp(t) {}
-};
-inline bool operator==(const UntypedTemp &t1, const UntypedTemp &t2) Q_DECL_NOTHROW
-{ return t1.temp.index == t2.temp.index && t1.temp.kind == t2.temp.kind; }
-inline bool operator!=(const UntypedTemp &t1, const UntypedTemp &t2) Q_DECL_NOTHROW
-{ return !(t1 == t2); }
-
-class DefUses
-{
-public:
-    struct DefUse {
-        DefUse()
-            : defStmt(0)
-            , blockOfStatement(0)
-        { uses.reserve(8); }
-        Temp temp;
-        Stmt *defStmt;
-        BasicBlock *blockOfStatement;
-        QVector<Stmt *> uses;
-
-        bool isValid() const
-        { return temp.kind != Temp::Invalid; }
-
-        void clear()
-        { defStmt = 0; blockOfStatement = 0; uses.clear(); }
-    };
-
-private:
-    std::vector<DefUse> _defUses;
-    typedef QVarLengthArray<Temp, 4> Temps;
-    std::vector<Temps> _usesPerStatement;
-
-    void ensure(Temp *newTemp)
-    {
-        if (_defUses.size() <= newTemp->index) {
-            _defUses.resize(newTemp->index + 1);
-        }
-    }
-
-    void ensure(Stmt *s)
-    {
-        Q_ASSERT(s->id() >= 0);
-        if (static_cast<unsigned>(s->id()) >= _usesPerStatement.size()) {
-            _usesPerStatement.resize(s->id() + 1);
-        }
-    }
-
-    void addUseForStatement(Stmt *s, const Temp &var)
-    {
-        ensure(s);
-        _usesPerStatement[s->id()].push_back(var);
-    }
-
-public:
-    DefUses(IR::Function *function)
-    {
-        _usesPerStatement.resize(function->statementCount());
-        _defUses.resize(function->tempCount);
-    }
-
-    void cleanup()
-    {
-        for (size_t i = 0, ei = _defUses.size(); i != ei; ++i) {
-            DefUse &defUse = _defUses[i];
-            if (defUse.isValid() && !defUse.defStmt)
-                defUse.clear();
-        }
-    }
-
-    unsigned statementCount() const
-    { return unsigned(_usesPerStatement.size()); }
-
-    unsigned tempCount() const
-    { return unsigned(_defUses.size()); }
-
-    const Temp &temp(int idx) const
-    { return _defUses[idx].temp; }
-
-    void addDef(Temp *newTemp, Stmt *defStmt, BasicBlock *defBlock)
-    {
-        ensure(newTemp);
-        DefUse &defUse = _defUses[newTemp->index];
-        Q_ASSERT(!defUse.isValid());
-        defUse.temp = *newTemp;
-        defUse.defStmt = defStmt;
-        defUse.blockOfStatement = defBlock;
-    }
-
-    QVector<UntypedTemp> defsUntyped() const
-    {
-        QVector<UntypedTemp> res;
-        res.reserve(tempCount());
-        for (const DefUse &du : _defUses)
-            if (du.isValid())
-                res.append(UntypedTemp(du.temp));
-        return res;
-    }
-
-    std::vector<const Temp *> defs() const {
-        std::vector<const Temp *> res;
-        const size_t ei = _defUses.size();
-        res.reserve(ei);
-        for (size_t i = 0; i != ei; ++i) {
-            const DefUse &du = _defUses.at(i);
-            if (du.isValid())
-                res.push_back(&du.temp);
-        }
-        return res;
-    }
-
-    void removeDef(const Temp &variable) {
-        Q_ASSERT(static_cast<unsigned>(variable.index) < _defUses.size());
-        _defUses[variable.index].clear();
-    }
-
-    void addUses(const Temp &variable, const QVector<Stmt *> &newUses)
-    {
-        Q_ASSERT(static_cast<unsigned>(variable.index) < _defUses.size());
-        QVector<Stmt *> &uses = _defUses[variable.index].uses;
-        for (Stmt *stmt : newUses)
-            if (std::find(uses.begin(), uses.end(), stmt) == uses.end())
-                uses.push_back(stmt);
-    }
-
-    void addUse(const Temp &variable, Stmt *newUse)
-    {
-        if (_defUses.size() <= variable.index) {
-            _defUses.resize(variable.index + 1);
-            DefUse &du = _defUses[variable.index];
-            du.temp = variable;
-            du.uses.push_back(newUse);
-            addUseForStatement(newUse, variable);
-            return;
-        }
-
-        QVector<Stmt *> &uses = _defUses[variable.index].uses;
-        if (std::find(uses.begin(), uses.end(), newUse) == uses.end())
-            uses.push_back(newUse);
-        addUseForStatement(newUse, variable);
-    }
-
-    int useCount(const Temp &variable) const
-    {
-        Q_ASSERT(static_cast<unsigned>(variable.index) < _defUses.size());
-        return _defUses[variable.index].uses.size();
-    }
-
-    Stmt *defStmt(const Temp &variable) const
-    {
-        Q_ASSERT(static_cast<unsigned>(variable.index) < _defUses.size());
-        return _defUses[variable.index].defStmt;
-    }
-
-    BasicBlock *defStmtBlock(const Temp &variable) const
-    {
-        Q_ASSERT(static_cast<unsigned>(variable.index) < _defUses.size());
-        return _defUses[variable.index].blockOfStatement;
-    }
-
-    void replaceBasicBlock(BasicBlock *from, BasicBlock *to)
-    {
-        for (auto &du : _defUses) {
-            if (du.blockOfStatement == from) {
-                du.blockOfStatement = to;
-            }
-        }
-    }
-
-    void removeUse(Stmt *usingStmt, const Temp &var)
-    {
-        Q_ASSERT(static_cast<unsigned>(var.index) < _defUses.size());
-        QVector<Stmt *> &uses = _defUses[var.index].uses;
-        uses.erase(std::remove(uses.begin(), uses.end(), usingStmt), uses.end());
-    }
-
-    void registerNewStatement(Stmt *s)
-    {
-        ensure(s);
-    }
-
-    const Temps &usedVars(Stmt *s) const
-    {
-        Q_ASSERT(s->id() >= 0);
-        Q_ASSERT(static_cast<unsigned>(s->id()) < _usesPerStatement.size());
-        return _usesPerStatement[s->id()];
-    }
-
-    const QVector<Stmt *> &uses(const Temp &var) const
-    {
-        return _defUses[var.index].uses;
-    }
-
-    QVector<Stmt*> removeDefUses(Stmt *s)
-    {
-        QVector<Stmt*> defStmts;
-        for (const Temp &usedVar : usedVars(s)) {
-            if (Stmt *ds = defStmt(usedVar))
-                defStmts += ds;
-            removeUse(s, usedVar);
-        }
-        if (Move *m = s->asMove()) {
-            if (Temp *t = m->target->asTemp())
-                removeDef(*t);
-        } else if (Phi *p = s->asPhi()) {
-            removeDef(*p->targetTemp);
-        }
-
-        return defStmts;
-    }
-
-    void dump() const
-    {
-        QBuffer buf;
-        buf.open(QIODevice::WriteOnly);
-        QTextStream qout(&buf);
-        qout << "Defines and uses:" << endl;
-        for (const DefUse &du : _defUses) {
-            if (!du.isValid())
-                continue;
-            qout << '%' << du.temp.index;
-            qout << " -> defined in block " << du.blockOfStatement->index()
-                 << ", statement: " << du.defStmt->id()
-                 << endl;
-            qout << "     uses:";
-            for (Stmt *s : du.uses)
-                qout << ' ' << s->id();
-            qout << endl;
-        }
-        qout << "Uses per statement:" << endl;
-        for (size_t i = 0, ei = _usesPerStatement.size(); i != ei; ++i) {
-            qout << "    " << i << ":";
-            for (const Temp &t : _usesPerStatement[i])
-                qout << ' ' << t.index;
-            qout << endl;
-        }
-        qDebug("%s", buf.data().constData());
-    }
-};
-
-void insertPhiNode(const Temp &a, BasicBlock *y, IR::Function *f) {
-    Phi *phiNode = f->NewStmt<Phi>();
-    phiNode->targetTemp = f->New<Temp>();
-    phiNode->targetTemp->init(a.kind, a.index);
-    y->prependStatement(phiNode);
-
-    phiNode->incoming.resize(y->in.size());
-    for (int i = 0, ei = y->in.size(); i < ei; ++i) {
-        Temp *t = f->New<Temp>();
-        t->init(a.kind, a.index);
-        phiNode->incoming[i] = t;
-    }
-}
-
-// High-level (recursive) algorithm:
-//   Mapping: old temp number -> new temp number
-//
-//   Start:
-//     Rename(start-node)
-//
-//   Rename(node, mapping):
-//     for each statement S in block n
-//       if S not in a phi-function
-//         for each use of some variable x in S
-//           y = mapping[x]
-//           replace the use of x with y in S
-//       for each definition of some variable a in S                        [1]
-//         a_new = generate new/unique temp
-//         mapping[a] = a_new
-//         replace definition of a with definition of a_new in S
-//     for each successor Y of block n
-//       Suppose n is the j-th predecessor of Y
-//       for each phi function in Y
-//         suppose the j-th operand of the phi-function is a
-//         i = mapping[a]
-//         replace the j-th operand with a_i
-//     for each child X of n                                                [2]
-//       Rename(X)
-//     for each newly generated temp from step [1] restore the old value    [3]
-//
-// This algorithm can run out of CPU stack space when there are lots of basic-blocks, like in a
-// switch statement with 8000 cases that all fall-through. The iterativer version below uses a
-// work-item stack, where step [1] from the algorithm above also pushes an "undo mapping change",
-// and step [2] pushes a "rename(X)" action. This eliminates step [3].
-//
-// Iterative version:
-//   Mapping: old temp number -> new temp number
-//
-//   The stack can hold two kinds of actions:
-//     "Rename basic block n"
-//     "Restore count for temp"
-//
-//   Start:
-//     counter = 0
-//     push "Rename start node" onto the stack
-//     while the stack is not empty:
-//       take the last item, and process it
-//
-//   Rename(n) =
-//     for each statement S in block n
-//       if S not in a phi-function
-//         for each use of some variable x in S
-//           y = mapping[x]
-//           replace the use of x with y in S
-//       for each definition of some variable a in S
-//         old = mapping[a]
-//         push Undo(a, old)
-//         counter = counter + 1
-//         new = counter;
-//         mapping[a] = new
-//         replace definition of a with definition of a_new in S
-//     for each successor Y of block n
-//       Suppose n is the j-th predecessor of Y
-//       for each phi function in Y
-//         suppose the j-th operand of the phi-function is a
-//         i = mapping[a]
-//         replace the j-th operand with a_i
-//     for each child X of n
-//       push Rename(X)
-//
-//   Undo(t, c) =
-//     mapping[t] = c
-class VariableRenamer
-{
-    Q_DISABLE_COPY(VariableRenamer)
-
-    IR::Function *function;
-    DefUses &defUses;
-    unsigned tempCount;
-
-    typedef std::vector<int> Mapping; // maps from existing/old temp number to the new and unique temp number.
-    enum { Absent = -1 };
-    Mapping vregMapping;
-    ProcessedBlocks processed;
-
-    BasicBlock *currentBB;
-    Stmt *currentStmt;
-
-    struct TodoAction {
-        enum { RestoreVReg, Rename } action;
-        union {
-            struct {
-                unsigned temp;
-                int previous;
-            } restoreData;
-            struct {
-                BasicBlock *basicBlock;
-            } renameData;
-        };
-
-        bool isValid() const { return action != Rename || renameData.basicBlock != 0; }
-
-        TodoAction()
-        {
-            action = Rename;
-            renameData.basicBlock = 0;
-        }
-
-        TodoAction(const Temp &t, int prev)
-        {
-            Q_ASSERT(t.kind == Temp::VirtualRegister);
-
-            action = RestoreVReg;
-            restoreData.temp = t.index;
-            restoreData.previous = prev;
-        }
-
-        TodoAction(BasicBlock *bb)
-        {
-            Q_ASSERT(bb);
-
-            action = Rename;
-            renameData.basicBlock = bb;
-        }
-    };
-
-    QVector<TodoAction> todo;
-
-public:
-    VariableRenamer(IR::Function *f, DefUses &defUses)
-        : function(f)
-        , defUses(defUses)
-        , tempCount(0)
-        , processed(f)
-    {
-        vregMapping.assign(f->tempCount, Absent);
-        todo.reserve(f->basicBlockCount());
-    }
-
-    void run() {
-        todo.append(TodoAction(function->basicBlock(0)));
-
-        while (!todo.isEmpty()) {
-            TodoAction todoAction = todo.back();
-            Q_ASSERT(todoAction.isValid());
-            todo.pop_back();
-
-            switch (todoAction.action) {
-            case TodoAction::Rename:
-                rename(todoAction.renameData.basicBlock);
-                break;
-            case TodoAction::RestoreVReg:
-                restore(vregMapping, todoAction.restoreData.temp, todoAction.restoreData.previous);
-                break;
-            default:
-                Q_UNREACHABLE();
-            }
-        }
-
-        function->tempCount = tempCount;
-    }
-
-private:
-    static inline void restore(Mapping &mapping, int temp, int previous)
-    {
-        mapping[temp] = previous;
-    }
-
-    void rename(BasicBlock *bb)
-    {
-        while (bb && !processed.alreadyProcessed(bb)) {
-            renameStatementsAndPhis(bb);
-            processed.markAsProcessed(bb);
-
-            BasicBlock *next = 0;
-            for (BasicBlock *out : bb->out) {
-                if (processed.alreadyProcessed(out))
-                    continue;
-                if (!next)
-                    next = out;
-                else
-                    todo.append(TodoAction(out));
-            }
-            bb = next;
-        }
-    }
-
-    void renameStatementsAndPhis(BasicBlock *bb)
-    {
-        currentBB = bb;
-
-        for (Stmt *s : bb->statements()) {
-            currentStmt = s;
-            visit(s);
-        }
-
-        for (BasicBlock *Y : bb->out) {
-            const int j = Y->in.indexOf(bb);
-            Q_ASSERT(j >= 0 && j < Y->in.size());
-            for (Stmt *s : Y->statements()) {
-                if (Phi *phi = s->asPhi()) {
-                    Temp *t = phi->incoming[j]->asTemp();
-                    unsigned newTmp = currentNumber(*t);
-//                    qDebug()<<"I: replacing phi use"<<a<<"with"<<newTmp<<"in L"<<Y->index;
-                    t->index = newTmp;
-                    t->kind = Temp::VirtualRegister;
-                    defUses.addUse(*t, phi);
-                } else {
-                    break;
-                }
-            }
-        }
-    }
-
-    unsigned currentNumber(const Temp &t)
-    {
-        int nr = Absent;
-        switch (t.kind) {
-        case Temp::VirtualRegister:
-            nr = vregMapping[t.index];
-            break;
-        default:
-            Q_UNREACHABLE();
-            nr = Absent;
-            break;
-        }
-        if (nr == Absent) {
-            // Special case: we didn't prune the Phi nodes yet, so for proper temps (virtual
-            // registers) the SSA algorithm might insert superfluous Phis that have uses without
-            // definition. E.g.: if a temporary got introduced in the "then" clause, it "could"
-            // reach the "end-if" block, so there will be a phi node for that temp. A later pass
-            // will clean this up by looking for uses-without-defines in phi nodes. So, what we do
-            // is to generate a new unique number, and leave it dangling.
-            nr = nextFreeTemp(t);
-        }
-
-        return nr;
-    }
-
-    unsigned nextFreeTemp(const Temp &t)
-    {
-        unsigned newIndex = tempCount++;
-        Q_ASSERT(newIndex <= INT_MAX);
-        int oldIndex = Absent;
-
-        switch (t.kind) {
-        case Temp::VirtualRegister:
-            oldIndex = vregMapping[t.index];
-            vregMapping[t.index] = newIndex;
-            break;
-        default:
-            Q_UNREACHABLE();
-        }
-
-        todo.append(TodoAction(t, oldIndex));
-
-        return newIndex;
-    }
-
-private:
-    void visit(Stmt *s)
-    {
-        if (auto move = s->asMove()) {
-            // uses:
-            visit(move->source);
-
-            // defs:
-            if (Temp *t = move->target->asTemp()) {
-                renameTemp(t);
-            } else {
-                visit(move->target);
-            }
-        } else if (auto phi = s->asPhi()) {
-            renameTemp(phi->targetTemp);
-        } else {
-            STMT_VISIT_ALL_KINDS(s);
-        }
-    }
-
-    void visit(Expr *e)
-    {
-        if (auto temp = e->asTemp()) {
-            temp->index = currentNumber(*temp);
-            temp->kind = Temp::VirtualRegister;
-            defUses.addUse(*temp, currentStmt);
-        } else {
-            EXPR_VISIT_ALL_KINDS(e);
-        }
-    }
-
-    void renameTemp(Temp *t) { // only called for defs, not uses
-        const int newIdx = nextFreeTemp(*t);
-//        qDebug()<<"I: replacing def of"<<a<<"with"<<newIdx;
-        t->kind = Temp::VirtualRegister;
-        t->index = newIdx;
-        defUses.addDef(t, currentStmt, currentBB);
-    }
-};
-
-// This function converts the IR to semi-pruned SSA form. For details about SSA and the algorightm,
-// see [Appel]. For the changes needed for semi-pruned SSA form, and for its advantages, see [Briggs].
-void convertToSSA(IR::Function *function, const DominatorTree &df, DefUses &defUses)
-{
-    // Collect all applicable variables:
-    VariableCollector variables(function);
-
-    // Prepare for phi node insertion:
-    std::vector<BitVector > A_phi;
-    const size_t ei = function->basicBlockCount();
-    A_phi.resize(ei);
-    for (size_t i = 0; i != ei; ++i)
-        A_phi[i].assign(function->tempCount, false);
-
-    std::vector<BasicBlock *> W;
-    W.reserve(8);
-
-    // Place phi functions:
-    for (const Temp &a : variables.allTemps()) {
-        if (a.isInvalid())
-            continue;
-        if (!variables.isNonLocal(a))
-            continue; // for semi-pruned SSA
-
-        W.clear();
-        variables.collectDefSites(a, W);
-        while (!W.empty()) {
-            BasicBlock *n = W.back();
-            W.pop_back();
-            const BasicBlockSet &dominatorFrontierForN = df.dominatorFrontier(n);
-            for (BasicBlockSet::const_iterator it = dominatorFrontierForN.begin(), eit = dominatorFrontierForN.end();
-                 it != eit; ++it) {
-                BasicBlock *y = *it;
-                if (!A_phi.at(y->index()).at(a.index)) {
-                    insertPhiNode(a, y, function);
-                    A_phi[y->index()].setBit(a.index);
-                    const std::vector<int> &varsInBlockY = variables.inBlock(y);
-                    if (std::find(varsInBlockY.begin(), varsInBlockY.end(), a.index) == varsInBlockY.end())
-                        W.push_back(y);
-                }
-            }
-        }
-    }
-
-    // Rename variables:
-    VariableRenamer(function, defUses).run();
-}
-
-/// Calculate if a phi node result is used only by other phi nodes, and if those uses are
-/// in turn also used by other phi nodes.
-bool hasPhiOnlyUses(Phi *phi, const DefUses &defUses, QBitArray &collectedPhis)
-{
-    collectedPhis.setBit(phi->id());
-
-    for (Stmt *use : defUses.uses(*phi->targetTemp)) {
-        Phi *dependentPhi = use->asPhi();
-        if (!dependentPhi)
-            return false; // there is a use by a non-phi node
-
-        if (collectedPhis.at(dependentPhi->id()))
-            continue; // we already found this node
-
-        if (!hasPhiOnlyUses(dependentPhi, defUses, collectedPhis))
-            return false;
-    }
-
-    return true;
-}
-
-void cleanupPhis(DefUses &defUses)
-{
-    QBitArray toRemove(defUses.statementCount());
-    QBitArray collectedPhis(defUses.statementCount());
-    std::vector<Phi *> allPhis;
-    allPhis.reserve(32);
-
-    for (const Temp *def : defUses.defs()) {
-        Stmt *defStmt = defUses.defStmt(*def);
-        if (!defStmt)
-            continue;
-
-        Phi *phi = defStmt->asPhi();
-        if (!phi)
-            continue;
-        allPhis.push_back(phi);
-        if (toRemove.at(phi->id()))
-            continue;
-
-        collectedPhis.fill(false);
-        if (hasPhiOnlyUses(phi, defUses, collectedPhis))
-            toRemove |= collectedPhis;
-    }
-
-    for (Phi *phi : allPhis) {
-        if (!toRemove.at(phi->id()))
-            continue;
-
-        const Temp &targetVar = *phi->targetTemp;
-        defUses.defStmtBlock(targetVar)->removeStatement(phi);
-
-        for (const Temp &usedVar : defUses.usedVars(phi))
-            defUses.removeUse(phi, usedVar);
-        defUses.removeDef(targetVar);
-    }
-
-    defUses.cleanup();
-}
-
-class StatementWorklist
-{
-    IR::Function *theFunction;
-    std::vector<Stmt *> stmts;
-    BitVector worklist;
-    unsigned worklistSize;
-    std::vector<int> replaced;
-    BitVector removed;
-
-    Q_DISABLE_COPY(StatementWorklist)
-
-public:
-    StatementWorklist(IR::Function *function)
-        : theFunction(function)
-        , stmts(function->statementCount(), static_cast<Stmt *>(0))
-        , worklist(function->statementCount(), false)
-        , worklistSize(0)
-        , replaced(function->statementCount(), Stmt::InvalidId)
-        , removed(function->statementCount())
-    {
-        grow();
-
-        for (BasicBlock *bb : function->basicBlocks()) {
-            if (bb->isRemoved())
-                continue;
-
-            for (Stmt *s : bb->statements()) {
-                if (!s)
-                    continue;
-
-                stmts[s->id()] = s;
-                worklist.setBit(s->id());
-                ++worklistSize;
-            }
-        }
-    }
-
-    void reset()
-    {
-        worklist.assign(worklist.size(), false);
-        worklistSize = 0;
-
-        for (Stmt *s : stmts) {
-            if (!s)
-                continue;
-
-            worklist.setBit(s->id());
-            ++worklistSize;
-        }
-
-        replaced.assign(replaced.size(), Stmt::InvalidId);
-        removed.assign(removed.size(), false);
-    }
-
-    void remove(Stmt *stmt)
-    {
-        replaced[stmt->id()] = Stmt::InvalidId;
-        removed.setBit(stmt->id());
-        if (worklist.at(stmt->id())) {
-            worklist.clearBit(stmt->id());
-            Q_ASSERT(worklistSize > 0);
-            --worklistSize;
-        }
-    }
-
-    void replace(Stmt *oldStmt, Stmt *newStmt)
-    {
-        Q_ASSERT(oldStmt);
-        Q_ASSERT(replaced[oldStmt->id()] == Stmt::InvalidId);
-        Q_ASSERT(removed.at(oldStmt->id()) == false);
-
-        Q_ASSERT(newStmt);
-        registerNewStatement(newStmt);
-        Q_ASSERT(replaced[newStmt->id()] == Stmt::InvalidId);
-        Q_ASSERT(removed.at(newStmt->id()) == false);
-
-        replaced[oldStmt->id()] = newStmt->id();
-        worklist.clearBit(oldStmt->id());
-    }
-
-    void applyToFunction()
-    {
-        for (BasicBlock *bb : theFunction->basicBlocks()) {
-            if (bb->isRemoved())
-                continue;
-
-            for (int i = 0; i < bb->statementCount();) {
-                Stmt *stmt = bb->statements().at(i);
-
-                int id = stmt->id();
-                Q_ASSERT(id != Stmt::InvalidId);
-                Q_ASSERT(static_cast<unsigned>(stmt->id()) < stmts.size());
-
-                for (int replacementId = replaced[id]; replacementId != Stmt::InvalidId; replacementId = replaced[replacementId])
-                    id = replacementId;
-                Q_ASSERT(id != Stmt::InvalidId);
-                Q_ASSERT(static_cast<unsigned>(stmt->id()) < stmts.size());
-
-                if (removed.at(id)) {
-                    bb->removeStatement(i);
-                } else {
-                    if (id != stmt->id())
-                        bb->replaceStatement(i, stmts[id]);
-
-                    ++i;
-                }
-            }
-        }
-
-        replaced.assign(replaced.size(), Stmt::InvalidId);
-        removed.assign(removed.size(), false);
-    }
-
-    StatementWorklist &operator+=(const QVector<Stmt *> &stmts)
-    {
-        for (Stmt *s : stmts)
-            this->operator+=(s);
-
-        return *this;
-    }
-
-    StatementWorklist &operator+=(Stmt *s)
-    {
-        if (!s)
-            return *this;
-
-        Q_ASSERT(s->id() >= 0);
-        Q_ASSERT(s->id() < worklist.size());
-
-        if (!worklist.at(s->id())) {
-            worklist.setBit(s->id());
-            ++worklistSize;
-        }
-
-        return *this;
-    }
-
-    StatementWorklist &operator-=(Stmt *s)
-    {
-        Q_ASSERT(s->id() >= 0);
-        Q_ASSERT(s->id() < worklist.size());
-
-        if (worklist.at(s->id())) {
-            worklist.clearBit(s->id());
-            Q_ASSERT(worklistSize > 0);
-            --worklistSize;
-        }
-
-        return *this;
-    }
-
-    unsigned size() const
-    {
-        return worklistSize;
-    }
-
-    Stmt *takeNext(Stmt *last)
-    {
-        if (worklistSize == 0)
-            return 0;
-
-        const int startAt = last ? last->id() + 1 : 0;
-        Q_ASSERT(startAt >= 0);
-        Q_ASSERT(startAt <= worklist.size());
-
-        Q_ASSERT(static_cast<size_t>(worklist.size()) == stmts.size());
-
-        int pos = worklist.findNext(startAt, true, /*wrapAround = */true);
-
-        worklist.clearBit(pos);
-        Q_ASSERT(worklistSize > 0);
-        --worklistSize;
-        Stmt *s = stmts.at(pos);
-        Q_ASSERT(s);
-
-        if (removed.at(s->id()))
-            return takeNext(s);
-
-        return s;
-    }
-
-    IR::Function *function() const
-    {
-        return theFunction;
-    }
-
-    void registerNewStatement(Stmt *s)
-    {
-        Q_ASSERT(s->id() >= 0);
-        if (static_cast<unsigned>(s->id()) >= stmts.size()) {
-            if (static_cast<unsigned>(s->id()) >= stmts.capacity())
-                grow();
-
-            int newSize = s->id() + 1;
-            stmts.resize(newSize, 0);
-            worklist.resize(newSize);
-            replaced.resize(newSize, Stmt::InvalidId);
-            removed.resize(newSize);
-        }
-
-        stmts[s->id()] = s;
-    }
-
-private:
-    void grow()
-    {
-        Q_ASSERT(stmts.capacity() < INT_MAX / 2);
-        int newCapacity = ((static_cast<int>(stmts.capacity()) + 1) * 3) / 2;
-        stmts.reserve(newCapacity);
-        worklist.reserve(newCapacity);
-        replaced.reserve(newCapacity);
-        removed.reserve(newCapacity);
-    }
-};
-
-class SideEffectsChecker
-{
-    bool _sideEffect;
-
-public:
-    SideEffectsChecker()
-        : _sideEffect(false)
-    {}
-
-    ~SideEffectsChecker()
-    {}
-
-    bool hasSideEffects(Expr *expr)
-    {
-        bool sideEffect = false;
-        qSwap(_sideEffect, sideEffect);
-        visit(expr);
-        qSwap(_sideEffect, sideEffect);
-        return sideEffect;
-    }
-
-protected:
-    void markAsSideEffect()
-    {
-        _sideEffect = true;
-    }
-
-    bool seenSideEffects() const { return _sideEffect; }
-
-    void visit(Expr *e)
-    {
-        if (auto n = e->asName()) {
-            visitName(n);
-        } else if (auto t = e->asTemp()) {
-            visitTemp(t);
-        } else if (auto c = e->asClosure()) {
-            visitClosure(c);
-        } else if (auto c = e->asConvert()) {
-            visitConvert(c);
-        } else if (auto u = e->asUnop()) {
-            visitUnop(u);
-        } else if (auto b = e->asBinop()) {
-            visitBinop(b);
-        } else if (auto c = e->asCall()) {
-            visitCall(c);
-        } else if (auto n = e->asNew()) {
-            visitNew(n);
-        } else if (auto s = e->asSubscript()) {
-            visitSubscript(s);
-        } else if (auto m = e->asMember()) {
-            visitMember(m);
-        }
-    }
-
-    virtual void visitTemp(Temp *) {}
-
-private:
-    void visitName(Name *e) {
-        if (e->freeOfSideEffects)
-            return;
-        // TODO: maybe we can distinguish between built-ins of which we know that they do not have
-        // a side-effect.
-        if (e->builtin == Name::builtin_invalid || (e->id && *e->id != QLatin1String("this")))
-            markAsSideEffect();
-    }
-
-    void visitClosure(Closure *) {
-        markAsSideEffect();
-    }
-
-    void visitConvert(Convert *e) {
-        visit(e->expr);
-
-        switch (e->expr->type) {
-        case QObjectType:
-        case StringType:
-        case VarType:
-            markAsSideEffect();
-            break;
-        default:
-            break;
-        }
-    }
-
-    void visitUnop(Unop *e) {
-        visit(e->expr);
-
-        switch (e->op) {
-        case OpUPlus:
-        case OpUMinus:
-        case OpNot:
-        case OpIncrement:
-        case OpDecrement:
-            if (e->expr->type == VarType || e->expr->type == StringType || e->expr->type == QObjectType)
-                markAsSideEffect();
-            break;
-
-        default:
-            break;
-        }
-    }
-
-    void visitBinop(Binop *e) {
-        // TODO: prune parts that don't have a side-effect. For example, in:
-        //   function f(x) { +x+1; return 0; }
-        // we can prune the binop and leave the unop/conversion.
-        _sideEffect = hasSideEffects(e->left);
-        _sideEffect |= hasSideEffects(e->right);
-
-        if (e->left->type == VarType || e->left->type == StringType || e->left->type == QObjectType
-                || e->right->type == VarType || e->right->type == StringType || e->right->type == QObjectType)
-            markAsSideEffect();
-    }
-
-    void visitSubscript(Subscript *e) {
-        visit(e->base);
-        visit(e->index);
-        markAsSideEffect();
-    }
-
-    void visitMember(Member *e) {
-        visit(e->base);
-        if (e->freeOfSideEffects)
-            return;
-        markAsSideEffect();
-    }
-
-    void visitCall(Call *e) {
-        visit(e->base);
-        for (ExprList *args = e->args; args; args = args->next)
-            visit(args->expr);
-        markAsSideEffect(); // TODO: there are built-in functions that have no side effect.
-    }
-
-    void visitNew(New *e) {
-        visit(e->base);
-        for (ExprList *args = e->args; args; args = args->next)
-            visit(args->expr);
-        markAsSideEffect(); // TODO: there are built-in types that have no side effect.
-    }
-};
-
-class EliminateDeadCode: public SideEffectsChecker
-{
-    DefUses &_defUses;
-    StatementWorklist &_worklist;
-    QVarLengthArray<Temp *, 8> _collectedTemps;
-
-public:
-    EliminateDeadCode(DefUses &defUses, StatementWorklist &worklist)
-        : _defUses(defUses)
-        , _worklist(worklist)
-    {}
-
-    void run(Expr *&expr, Stmt *stmt) {
-        _collectedTemps.clear();
-        if (!hasSideEffects(expr)) {
-            expr = 0;
-            for (Temp *t : _collectedTemps) {
-                _defUses.removeUse(stmt, *t);
-                _worklist += _defUses.defStmt(*t);
-            }
-        }
-    }
-
-protected:
-    void visitTemp(Temp *e) override final
-    {
-        _collectedTemps.append(e);
-    }
-};
-
-class PropagateTempTypes
-{
-    const DefUses &defUses;
-    UntypedTemp theTemp;
-    DiscoveredType newType;
-
-public:
-    PropagateTempTypes(const DefUses &defUses)
-        : defUses(defUses)
-    {}
-
-    void run(const UntypedTemp &temp, const DiscoveredType &type)
-    {
-        newType = type;
-        theTemp = temp;
-        if (Stmt *defStmt = defUses.defStmt(temp.temp))
-            visit(defStmt);
-        for (Stmt *use : defUses.uses(temp.temp))
-            visit(use);
-    }
-
-private:
-    void visit(Stmt *s)
-    {
-        STMT_VISIT_ALL_KINDS(s);
-    }
-
-    void visit(Expr *e)
-    {
-        if (auto temp = e->asTemp()) {
-            if (theTemp == UntypedTemp(*temp)) {
-                temp->type = static_cast<Type>(newType.type);
-                temp->memberResolver = newType.memberResolver;
-            }
-        } else {
-            EXPR_VISIT_ALL_KINDS(e);
-        }
-    }
-};
-
-class TypeInference
-{
-    enum { DebugTypeInference = 0 };
-
-    QQmlEnginePrivate *qmlEngine;
-    const DefUses &_defUses;
-    typedef std::vector<DiscoveredType> TempTypes;
-    TempTypes _tempTypes;
-    StatementWorklist *_worklist;
-    struct TypingResult {
-        DiscoveredType type;
-        bool fullyTyped;
-
-        TypingResult(const DiscoveredType &type = DiscoveredType()) {
-#if defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ == 6
-            // avoid optimization bug in gcc 4.6.3 armhf
-            ((int volatile &) this->type.type) = type.type;
-#endif
-            this->type = type;
-            fullyTyped = type.type != UnknownType;
-        }
-        explicit TypingResult(MemberExpressionResolver *memberResolver)
-            : type(memberResolver)
-            , fullyTyped(true)
-        {}
-    };
-    TypingResult _ty;
-    Stmt *_currentStmt;
-
-public:
-    TypeInference(QQmlEnginePrivate *qmlEngine, const DefUses &defUses)
-        : qmlEngine(qmlEngine)
-        , _defUses(defUses)
-        , _tempTypes(_defUses.tempCount())
-        , _worklist(0)
-        , _ty(UnknownType)
-        , _currentStmt(nullptr)
-    {}
-
-    void run(StatementWorklist &w) {
-        _worklist = &w;
-
-        Stmt *s = 0;
-        while ((s = _worklist->takeNext(s))) {
-            if (s->asJump())
-                continue;
-
-            if (DebugTypeInference) {
-                QBuffer buf;
-                buf.open(QIODevice::WriteOnly);
-                QTextStream qout(&buf);
-                qout<<"Typing stmt ";
-                IRPrinter(&qout).print(s);
-                qout.flush();
-                qDebug("%s", buf.data().constData());
-
-                qDebug("%u left in the worklist", _worklist->size());
-            }
-
-            if (!run(s)) {
-                *_worklist += s;
-                if (DebugTypeInference) {
-                    QBuffer buf;
-                    buf.open(QIODevice::WriteOnly);
-                    QTextStream qout(&buf);
-                    qout<<"Pushing back stmt: ";
-                    IRPrinter(&qout).print(s);
-                    qout.flush();
-                    qDebug("%s", buf.data().constData());
-                }
-            } else {
-                if (DebugTypeInference) {
-                    QBuffer buf;
-                    buf.open(QIODevice::WriteOnly);
-                    QTextStream qout(&buf);
-                    qout<<"Finished: ";
-                    IRPrinter(&qout).print(s);
-                    qout.flush();
-                    qDebug("%s", buf.data().constData());
-                }
-            }
-        }
-
-        PropagateTempTypes propagator(_defUses);
-        for (size_t i = 0, ei = _tempTypes.size(); i != ei; ++i) {
-            const Temp &temp = _defUses.temp(int(i));
-            if (temp.kind == Temp::Invalid)
-                continue;
-            const DiscoveredType &tempType = _tempTypes[i];
-            if (tempType.type == UnknownType)
-                continue;
-            propagator.run(temp, tempType);
-        }
-
-        _worklist = 0;
-    }
-
-private:
-    bool run(Stmt *s) {
-        TypingResult ty;
-        std::swap(_ty, ty);
-        std::swap(_currentStmt, s);
-        visit(_currentStmt);
-        std::swap(_currentStmt, s);
-        std::swap(_ty, ty);
-        return ty.fullyTyped;
-    }
-
-    TypingResult run(Expr *e) {
-        TypingResult ty;
-        std::swap(_ty, ty);
-        visit(e);
-        std::swap(_ty, ty);
-
-        if (ty.type != UnknownType)
-            setType(e, ty.type);
-        return ty;
-    }
-
-    void setType(Expr *e, DiscoveredType ty) {
-        if (Temp *t = e->asTemp()) {
-            if (DebugTypeInference)
-                qDebug() << "Setting type for temp" << t->index
-                         << " to " << typeName(Type(ty.type)) << "(" << ty.type << ")"
-                         << endl;
-
-            DiscoveredType &it = _tempTypes[t->index];
-            if (it != ty) {
-                it = ty;
-
-                if (DebugTypeInference) {
-                    for (Stmt *s : _defUses.uses(*t)) {
-                        QBuffer buf;
-                        buf.open(QIODevice::WriteOnly);
-                        QTextStream qout(&buf);
-                        qout << "Pushing back dependent stmt: ";
-                        IRPrinter(&qout).print(s);
-                        qout.flush();
-                        qDebug("%s", buf.data().constData());
-                    }
-                }
-
-                for (Stmt *s : qAsConst(_defUses.uses(*t))) {
-                    if (s != _currentStmt) {
-                        *_worklist += s;
-                    }
-                }
-            }
-        } else {
-            e->type = (Type) ty.type;
-        }
-    }
-
-private:
-    void visit(Expr *e)
-    {
-        if (auto c = e->asConst()) {
-            visitConst(c);
-        } else if (auto s = e->asString()) {
-            visitString(s);
-        } else if (auto r = e->asRegExp()) {
-            visitRegExp(r);
-        } else if (auto n = e->asName()) {
-            visitName(n);
-        } else if (auto t = e->asTemp()) {
-            visitTemp(t);
-        } else if (auto a = e->asArgLocal()) {
-            visitArgLocal(a);
-        } else if (auto c = e->asClosure()) {
-            visitClosure(c);
-        } else if (auto c = e->asConvert()) {
-            visitConvert(c);
-        } else if (auto u = e->asUnop()) {
-            visitUnop(u);
-        } else if (auto b = e->asBinop()) {
-            visitBinop(b);
-        } else if (auto c = e->asCall()) {
-            visitCall(c);
-        } else if (auto n = e->asNew()) {
-            visitNew(n);
-        } else if (auto s = e->asSubscript()) {
-            visitSubscript(s);
-        } else if (auto m = e->asMember()) {
-            visitMember(m);
-        } else {
-            Q_UNREACHABLE();
-        }
-    }
-
-    void visitConst(Const *c) {
-        if (c->type & NumberType) {
-            if (canConvertToSignedInteger(c->value))
-                _ty = TypingResult(SInt32Type);
-            else if (canConvertToUnsignedInteger(c->value))
-                _ty = TypingResult(UInt32Type);
-            else
-                _ty = TypingResult(c->type);
-        } else
-            _ty = TypingResult(c->type);
-    }
-    void visitString(IR::String *) { _ty = TypingResult(StringType); }
-    void visitRegExp(IR::RegExp *) { _ty = TypingResult(VarType); }
-    void visitName(Name *) { _ty = TypingResult(VarType); }
-    void visitTemp(Temp *e) {
-        if (e->memberResolver && e->memberResolver->isValid())
-            _ty = TypingResult(e->memberResolver);
-        else
-            _ty = TypingResult(_tempTypes[e->index]);
-        setType(e, _ty.type);
-    }
-    void visitArgLocal(ArgLocal *e) {
-        _ty = TypingResult(VarType);
-        setType(e, _ty.type);
-    }
-
-    void visitClosure(Closure *) { _ty = TypingResult(VarType); }
-    void visitConvert(Convert *e) {
-        _ty = TypingResult(e->type);
-    }
-
-    void visitUnop(Unop *e) {
-        _ty = run(e->expr);
-        switch (e->op) {
-        case OpUPlus: _ty.type = DoubleType; return;
-        case OpUMinus: _ty.type = DoubleType; return;
-        case OpCompl: _ty.type = SInt32Type; return;
-        case OpNot: _ty.type = BoolType; return;
-
-        case OpIncrement:
-        case OpDecrement:
-            Q_ASSERT(!"Inplace operators should have been removed!");
-            Q_UNREACHABLE();
-        default:
-            Q_UNIMPLEMENTED();
-            Q_UNREACHABLE();
-        }
-    }
-
-    void visitBinop(Binop *e) {
-        TypingResult leftTy = run(e->left);
-        TypingResult rightTy = run(e->right);
-        _ty.fullyTyped = leftTy.fullyTyped && rightTy.fullyTyped;
-
-        switch (e->op) {
-        case OpAdd:
-            if (leftTy.type.test(VarType) || leftTy.type.test(QObjectType) || rightTy.type.test(VarType) || rightTy.type.test(QObjectType))
-                _ty.type = VarType;
-            else if (leftTy.type.test(StringType) || rightTy.type.test(StringType))
-                _ty.type = StringType;
-            else if (leftTy.type != UnknownType && rightTy.type != UnknownType)
-                _ty.type = DoubleType;
-            else
-                _ty.type = UnknownType;
-            break;
-        case OpSub:
-            _ty.type = DoubleType;
-            break;
-
-        case OpMul:
-        case OpDiv:
-        case OpMod:
-            _ty.type = DoubleType;
-            break;
-
-        case OpBitAnd:
-        case OpBitOr:
-        case OpBitXor:
-        case OpLShift:
-        case OpRShift:
-            _ty.type = SInt32Type;
-            break;
-        case OpURShift:
-            _ty.type = UInt32Type;
-            break;
-
-        case OpGt:
-        case OpLt:
-        case OpGe:
-        case OpLe:
-        case OpEqual:
-        case OpNotEqual:
-        case OpStrictEqual:
-        case OpStrictNotEqual:
-        case OpAnd:
-        case OpOr:
-        case OpInstanceof:
-        case OpIn:
-            _ty.type = BoolType;
-            break;
-
-        default:
-            Q_UNIMPLEMENTED();
-            Q_UNREACHABLE();
-        }
-    }
-
-    void visitCall(Call *e) {
-        _ty = run(e->base);
-        for (ExprList *it = e->args; it; it = it->next)
-            _ty.fullyTyped &= run(it->expr).fullyTyped;
-        _ty.type = VarType;
-    }
-    void visitNew(New *e) {
-        _ty = run(e->base);
-        for (ExprList *it = e->args; it; it = it->next)
-            _ty.fullyTyped &= run(it->expr).fullyTyped;
-        _ty.type = VarType;
-    }
-    void visitSubscript(Subscript *e) {
-        _ty.fullyTyped = run(e->base).fullyTyped && run(e->index).fullyTyped;
-        _ty.type = VarType;
-    }
-
-    void visitMember(Member *e) {
-        _ty = run(e->base);
-
-        if (_ty.fullyTyped && _ty.type.memberResolver && _ty.type.memberResolver->isValid()) {
-            MemberExpressionResolver *resolver = _ty.type.memberResolver;
-            _ty.type = resolver->resolveMember(qmlEngine, resolver, e);
-        } else
-            _ty.type = VarType;
-    }
-
-    void visit(Stmt *s)
-    {
-        if (auto e = s->asExp()) {
-            visitExp(e);
-        } else if (auto m = s->asMove()) {
-            visitMove(m);
-        } else if (auto j = s->asJump()) {
-            visitJump(j);
-        } else if (auto c = s->asCJump()) {
-            visitCJump(c);
-        } else if (auto r = s->asRet()) {
-            visitRet(r);
-        } else if (auto p = s->asPhi()) {
-            visitPhi(p);
-        } else {
-            Q_UNREACHABLE();
-        }
-    }
-
-    void visitExp(Exp *s) { _ty = run(s->expr); }
-    void visitMove(Move *s) {
-        if (Temp *t = s->target->asTemp()) {
-            if (Name *n = s->source->asName()) {
-                if (n->builtin == Name::builtin_qml_context) {
-                    _ty = TypingResult(t->memberResolver);
-                    setType(n, _ty.type);
-                    setType(t, _ty.type);
-                    return;
-                }
-            }
-            TypingResult sourceTy = run(s->source);
-            setType(t, sourceTy.type);
-            _ty = sourceTy;
-            return;
-        }
-
-        TypingResult sourceTy = run(s->source);
-        _ty = run(s->target);
-        _ty.fullyTyped &= sourceTy.fullyTyped;
-    }
-
-    void visitJump(Jump *) { _ty = TypingResult(MissingType); }
-    void visitCJump(CJump *s) { _ty = run(s->cond); }
-    void visitRet(Ret *s) { _ty = run(s->expr); }
-    void visitPhi(Phi *s) {
-        _ty = run(s->incoming[0]);
-        for (int i = 1, ei = s->incoming.size(); i != ei; ++i) {
-            TypingResult ty = run(s->incoming[i]);
-            if (!ty.fullyTyped && _ty.fullyTyped) {
-                // When one of the temps not fully typed, we already know that we cannot completely type this node.
-                // So, pick the type we calculated upto this point, and wait until the unknown one will be typed.
-                // At that point, this statement will be re-scheduled, and then we can fully type this node.
-                _ty.fullyTyped = false;
-                break;
-            }
-            _ty.type.type |= ty.type.type;
-            _ty.fullyTyped &= ty.fullyTyped;
-            if (_ty.type.test(QObjectType) && _ty.type.memberResolver)
-                _ty.type.memberResolver->clear(); // ### TODO: find common ancestor meta-object
-        }
-
-        switch (_ty.type.type) {
-        case UnknownType:
-        case UndefinedType:
-        case NullType:
-        case BoolType:
-        case SInt32Type:
-        case UInt32Type:
-        case DoubleType:
-        case StringType:
-        case QObjectType:
-        case VarType:
-            // The type is not a combination of two or more types, so we're done.
-            break;
-
-        default:
-            // There are multiple types involved, so:
-            if (_ty.type.isNumber())
-                // The type is any combination of double/int32/uint32, but nothing else. So we can
-                // type it as double.
-                _ty.type = DoubleType;
-            else
-                // There just is no single type that can hold this combination, so:
-                _ty.type = VarType;
-        }
-
-        setType(s->targetTemp, _ty.type);
-    }
-};
-
-class ReverseInference
-{
-    const DefUses &_defUses;
-
-public:
-    ReverseInference(const DefUses &defUses)
-        : _defUses(defUses)
-    {}
-
-    void run(IR::Function *f)
-    {
-        Q_UNUSED(f);
-
-        QVector<UntypedTemp> knownOk;
-        QVector<UntypedTemp> candidates = _defUses.defsUntyped();
-        while (!candidates.isEmpty()) {
-            UntypedTemp temp = candidates.last();
-            candidates.removeLast();
-
-            if (knownOk.contains(temp))
-                continue;
-
-            if (!isUsedAsInt32(temp, knownOk))
-                continue;
-
-            Stmt *s = _defUses.defStmt(temp.temp);
-            Move *m = s->asMove();
-            if (!m)
-                continue;
-            Temp *target = m->target->asTemp();
-            if (!target || temp != UntypedTemp(*target) || target->type == SInt32Type)
-                continue;
-            if (Temp *t = m->source->asTemp()) {
-                candidates.append(*t);
-            } else if (m->source->asConvert()) {
-                break;
-            } else if (Binop *b = m->source->asBinop()) {
-                bool iterateOnOperands = true;
-
-                switch (b->op) {
-                case OpSub:
-                case OpMul:
-                case OpAdd:
-                    if (b->left->type == SInt32Type && b->right->type == SInt32Type) {
-                        iterateOnOperands = false;
-                        break;
-                    } else {
-                        continue;
-                    }
-                case OpBitAnd:
-                case OpBitOr:
-                case OpBitXor:
-                case OpLShift:
-                case OpRShift:
-                case OpURShift:
-                    break;
-                default:
-                    continue;
-                }
-
-                if (iterateOnOperands) {
-                    if (Temp *lt = b->left->asTemp())
-                        candidates.append(*lt);
-                    if (Temp *rt = b->right->asTemp())
-                        candidates.append(*rt);
-                }
-            } else if (Unop *u = m->source->asUnop()) {
-                if (u->op == OpCompl || u->op == OpUPlus) {
-                    if (Temp *t = u->expr->asTemp())
-                        candidates.append(*t);
-                }
-            } else {
-                continue;
-            }
-
-            knownOk.append(temp);
-        }
-
-        PropagateTempTypes propagator(_defUses);
-        for (const UntypedTemp &t : qAsConst(knownOk)) {
-            propagator.run(t, SInt32Type);
-            if (Stmt *defStmt = _defUses.defStmt(t.temp)) {
-                if (Move *m = defStmt->asMove()) {
-                    if (Convert *c = m->source->asConvert()) {
-                        c->type = SInt32Type;
-                    } else if (Unop *u = m->source->asUnop()) {
-                        if (u->op != OpUMinus)
-                            u->type = SInt32Type;
-                    } else if (Binop *b = m->source->asBinop()) {
-                        b->type = SInt32Type;
-                    }
-                }
-            }
-        }
-    }
-
-private:
-    bool isUsedAsInt32(const UntypedTemp &t, const QVector<UntypedTemp> &knownOk) const
-    {
-        const QVector<Stmt *> &uses = _defUses.uses(t.temp);
-        if (uses.isEmpty())
-            return false;
-
-        for (Stmt *use : uses) {
-            if (Move *m = use->asMove()) {
-                Temp *targetTemp = m->target->asTemp();
-
-                if (m->source->asTemp()) {
-                    if (!targetTemp || !knownOk.contains(*targetTemp))
-                        return false;
-                } else if (m->source->asConvert()) {
-                    continue;
-                } else if (Binop *b = m->source->asBinop()) {
-                    switch (b->op) {
-                    case OpAdd:
-                    case OpSub:
-                    case OpMul:
-                        if (!targetTemp || !knownOk.contains(*targetTemp))
-                            return false;
-                        Q_FALLTHROUGH();
-                    case OpBitAnd:
-                    case OpBitOr:
-                    case OpBitXor:
-                    case OpRShift:
-                    case OpLShift:
-                    case OpURShift:
-                        continue;
-                    default:
-                        return false;
-                    }
-                } else if (Unop *u = m->source->asUnop()) {
-                    if (u->op == OpUPlus) {
-                        if (!targetTemp || !knownOk.contains(*targetTemp))
-                            return false;
-                    } else if (u->op != OpCompl) {
-                        return false;
-                    }
-                } else {
-                    return false;
-                }
-            } else
-                return false;
-        }
-
-        return true;
-    }
-};
-
-void convertConst(Const *c, Type targetType)
-{
-    switch (targetType) {
-    case DoubleType:
-        break;
-    case SInt32Type:
-        c->value = QV4::Primitive::toInt32(c->value);
-        break;
-    case UInt32Type:
-        c->value = QV4::Primitive::toUInt32(c->value);
-        break;
-    case BoolType:
-        c->value = !(c->value == 0 || std::isnan(c->value));
-        break;
-    case NullType:
-    case UndefinedType:
-        c->value = qt_qnan();
-        c->type = targetType;
-        break;
-    default:
-        Q_UNIMPLEMENTED();
-        Q_ASSERT(!"Unimplemented!");
-        break;
-    }
-    c->type = targetType;
-}
-
-class TypePropagation
-{
-    DefUses &_defUses;
-    Type _ty;
-    IR::Function *_f;
-
-    bool run(Expr *&e, Type requestedType = UnknownType, bool insertConversion = true) {
-        qSwap(_ty, requestedType);
-        visit(e);
-        qSwap(_ty, requestedType);
-
-        if (requestedType != UnknownType) {
-            if (e->type != requestedType) {
-                if (requestedType & NumberType || requestedType == BoolType) {
-                    if (insertConversion)
-                        addConversion(e, requestedType);
-                    return true;
-                }
-            }
-        }
-
-        return false;
-    }
-
-    struct Conversion {
-        Expr **expr;
-        Type targetType;
-        Stmt *stmt;
-
-        Conversion(Expr **expr = 0, Type targetType = UnknownType, Stmt *stmt = 0)
-            : expr(expr)
-            , targetType(targetType)
-            , stmt(stmt)
-        {}
-    };
-
-    Stmt *_currStmt;
-    QVector<Conversion> _conversions;
-
-    void addConversion(Expr *&expr, Type targetType) {
-        _conversions.append(Conversion(&expr, targetType, _currStmt));
-    }
-
-public:
-    TypePropagation(DefUses &defUses) : _defUses(defUses), _ty(UnknownType) {}
-
-    void run(IR::Function *f, StatementWorklist &worklist) {
-        _f = f;
-        for (BasicBlock *bb : f->basicBlocks()) {
-            if (bb->isRemoved())
-                continue;
-            _conversions.clear();
-
-            for (Stmt *s : bb->statements()) {
-                _currStmt = s;
-                visit(s);
-            }
-
-            for (const Conversion &conversion : qAsConst(_conversions)) {
-                IR::Move *move = conversion.stmt->asMove();
-
-                // Note: isel only supports move into member when source is a temp, so convert
-                // is not a supported source.
-                if (move && move->source->asTemp() && !move->target->asMember()) {
-                    *conversion.expr = bb->CONVERT(*conversion.expr, conversion.targetType);
-                } else if (Const *c = (*conversion.expr)->asConst()) {
-                    convertConst(c, conversion.targetType);
-                } else if (ArgLocal *al = (*conversion.expr)->asArgLocal()) {
-                    Temp *target = bb->TEMP(bb->newTemp(BasicBlock::NewTempForOptimizer));
-                    target->type = conversion.targetType;
-                    Expr *convert = bb->CONVERT(al, conversion.targetType);
-                    Move *convCall = f->NewStmt<Move>();
-                    worklist.registerNewStatement(convCall);
-                    convCall->init(target, convert);
-                    _defUses.addDef(target, convCall, bb);
-
-                    Temp *source = bb->TEMP(target->index);
-                    source->type = conversion.targetType;
-                    _defUses.addUse(*source, conversion.stmt);
-
-                    if (conversion.stmt->asPhi()) {
-                        // Only temps can be used as arguments to phi nodes, so this is a sanity check...:
-                        Q_UNREACHABLE();
-                    } else {
-                        bb->insertStatementBefore(conversion.stmt, convCall);
-                    }
-
-                    *conversion.expr = source;
-                } else if (Temp *t = (*conversion.expr)->asTemp()) {
-                    Temp *target = bb->TEMP(bb->newTemp(BasicBlock::NewTempForOptimizer));
-                    target->type = conversion.targetType;
-                    Expr *convert = bb->CONVERT(t, conversion.targetType);
-                    Move *convCall = f->NewStmt<Move>();
-                    worklist.registerNewStatement(convCall);
-                    convCall->init(target, convert);
-                    _defUses.addDef(target, convCall, bb);
-                    _defUses.addUse(*t, convCall);
-
-                    Temp *source = bb->TEMP(target->index);
-                    source->type = conversion.targetType;
-                    _defUses.removeUse(conversion.stmt, *t);
-                    _defUses.addUse(*source, conversion.stmt);
-
-                    if (Phi *phi = conversion.stmt->asPhi()) {
-                        int idx = phi->incoming.indexOf(t);
-                        Q_ASSERT(idx != -1);
-                        bb->in[idx]->insertStatementBeforeTerminator(convCall);
-                    } else {
-                        bb->insertStatementBefore(conversion.stmt, convCall);
-                    }
-
-                    *conversion.expr = source;
-                } else if (Unop *u = (*conversion.expr)->asUnop()) {
-                    // convert:
-                    //   int32{%2} = double{-double{%1}};
-                    // to:
-                    //   double{%3} = double{-double{%1}};
-                    //   int32{%2} = int32{convert(double{%3})};
-                    Temp *tmp = bb->TEMP(bb->newTemp(BasicBlock::NewTempForOptimizer));
-                    tmp->type = u->type;
-                    Move *extraMove = f->NewStmt<Move>();
-                    worklist.registerNewStatement(extraMove);
-                    extraMove->init(tmp, u);
-                    _defUses.addDef(tmp, extraMove, bb);
-
-                    if (Temp *unopOperand = u->expr->asTemp()) {
-                        _defUses.addUse(*unopOperand, extraMove);
-                        _defUses.removeUse(move, *unopOperand);
-                    }
-
-                    bb->insertStatementBefore(conversion.stmt, extraMove);
-
-                    *conversion.expr = bb->CONVERT(CloneExpr::cloneTemp(tmp, f), conversion.targetType);
-                    _defUses.addUse(*tmp, move);
-                } else {
-                    Q_UNREACHABLE();
-                }
-            }
-        }
-    }
-
-private:
-    void visit(Expr *e)
-    {
-        if (auto c = e->asConst()) {
-            visitConst(c);
-        } else if (auto c = e->asConvert()) {
-            run(c->expr, c->type);
-        } else if (auto u = e->asUnop()) {
-            run(u->expr, u->type);
-        } else if (auto b = e->asBinop()) {
-            visitBinop(b);
-        } else if (auto c = e->asCall()) {
-            visitCall(c);
-        } else if (auto n = e->asNew()) {
-            visitNew(n);
-        } else if (auto s = e->asSubscript()) {
-            visitSubscript(s);
-        } else if (auto m = e->asMember()) {
-            visitMember(m);
-        }
-    }
-
-    void visitConst(Const *c) {
-        if (_ty & NumberType && c->type & NumberType) {
-            if (_ty == SInt32Type)
-                c->value = QV4::Primitive::toInt32(c->value);
-            else if (_ty == UInt32Type)
-                c->value = QV4::Primitive::toUInt32(c->value);
-            c->type = _ty;
-        }
-    }
-
-    void visitBinop(Binop *e) {
-        // FIXME: This routine needs more tuning!
-        switch (e->op) {
-        case OpAdd:
-        case OpSub:
-        case OpMul:
-        case OpDiv:
-        case OpMod:
-        case OpBitAnd:
-        case OpBitOr:
-        case OpBitXor:
-            run(e->left, e->type);
-            run(e->right, e->type);
-            break;
-
-        case OpLShift:
-        case OpRShift:
-        case OpURShift:
-            run(e->left, SInt32Type);
-            run(e->right, SInt32Type);
-            break;
-
-        case OpGt:
-        case OpLt:
-        case OpGe:
-        case OpLe:
-        case OpEqual:
-        case OpNotEqual:
-            if (e->left->type == DoubleType) {
-                run(e->right, DoubleType);
-            } else if (e->right->type == DoubleType) {
-                run(e->left, DoubleType);
-            } else {
-                run(e->left, e->left->type);
-                run(e->right, e->right->type);
-            }
-            break;
-
-        case OpStrictEqual:
-        case OpStrictNotEqual:
-        case OpInstanceof:
-        case OpIn:
-            run(e->left, e->left->type);
-            run(e->right, e->right->type);
-            break;
-
-        default:
-            Q_UNIMPLEMENTED();
-            Q_UNREACHABLE();
-        }
-    }
-    void visitCall(Call *e) {
-        run(e->base);
-        for (ExprList *it = e->args; it; it = it->next)
-            run(it->expr);
-    }
-    void visitNew(New *e) {
-        run(e->base);
-        for (ExprList *it = e->args; it; it = it->next)
-            run(it->expr);
-    }
-    void visitSubscript(Subscript *e) { run(e->base); run(e->index); }
-    void visitMember(Member *e) { run(e->base); }
-
-    void visit(Stmt *s)
-    {
-        if (auto e = s->asExp()) {
-            visitExp(e);
-        } else if (auto m = s->asMove()) {
-            visitMove(m);
-        } else if (auto c = s->asCJump()) {
-            visitCJump(c);
-        } else if (auto r = s->asRet()) {
-            visitRet(r);
-        } else if (auto p = s->asPhi()) {
-            visitPhi(p);
-        }
-    }
-
-    void visitExp(Exp *s) { run(s->expr); }
-    void visitMove(Move *s) {
-        if (s->source->asConvert())
-            return; // this statement got inserted for a phi-node type conversion
-
-        run(s->target);
-
-        if (Unop *u = s->source->asUnop()) {
-            if (u->op == OpUPlus) {
-                if (run(u->expr, s->target->type, false)) {
-                    Convert *convert = _f->New<Convert>();
-                    convert->init(u->expr, s->target->type);
-                    s->source = convert;
-                } else {
-                    s->source = u->expr;
-                }
-
-                return;
-            }
-        }
-
-        const Member *targetMember = s->target->asMember();
-        const bool inhibitConversion = targetMember && targetMember->inhibitTypeConversionOnWrite;
-
-        run(s->source, s->target->type, !inhibitConversion);
-    }
-    void visitCJump(CJump *s) {
-        run(s->cond, BoolType);
-    }
-    void visitRet(Ret *s) { run(s->expr); }
-    void visitPhi(Phi *s) {
-        Type ty = s->targetTemp->type;
-        for (int i = 0, ei = s->incoming.size(); i != ei; ++i)
-            run(s->incoming[i], ty);
-    }
-};
-
-void splitCriticalEdges(IR::Function *f, DominatorTree &df, StatementWorklist &worklist, DefUses &defUses)
-{
-    const QVector<BasicBlock *> copy = f->basicBlocks();
-    for (BasicBlock *toBB : copy) {
-        if (toBB->isRemoved())
-            continue;
-        if (toBB->in.size() < 2)
-            continue;
-
-        for (int inIdx = 0, eInIdx = toBB->in.size(); inIdx != eInIdx; ++inIdx) {
-            BasicBlock *fromBB = toBB->in[inIdx];
-            if (fromBB->out.size() < 2)
-                continue;
-
-            // We found a critical edge.
-            // create the basic block:
-            BasicBlock *newBB = f->newBasicBlock(toBB->catchBlock);
-            Jump *s = f->NewStmt<Jump>();
-            worklist.registerNewStatement(s);
-            defUses.registerNewStatement(s);
-            s->init(toBB);
-            newBB->appendStatement(s);
-
-            // rewire the old outgoing edge
-            int outIdx = fromBB->out.indexOf(toBB);
-            fromBB->out[outIdx] = newBB;
-            newBB->in.append(fromBB);
-
-            // rewire the old incoming edge
-            toBB->in[inIdx] = newBB;
-            newBB->out.append(toBB);
-
-            // add newBB to the correct loop group
-            if (toBB->isGroupStart()) {
-                if (fromBB == toBB) {
-                    // special case: the loop header points back to itself (so it's a small loop).
-                    newBB->setContainingGroup(toBB);
-                } else {
-                    BasicBlock *container;
-                    for (container = fromBB->containingGroup(); container; container = container->containingGroup())
-                        if (container == toBB)
-                            break;
-                    if (container == toBB) // if we were already inside the toBB loop
-                        newBB->setContainingGroup(toBB);
-                    else
-                        newBB->setContainingGroup(toBB->containingGroup());
-                }
-            } else {
-                newBB->setContainingGroup(toBB->containingGroup());
-            }
-
-            // patch the terminator
-            Stmt *terminator = fromBB->terminator();
-            if (Jump *j = terminator->asJump()) {
-                Q_ASSERT(outIdx == 0);
-                j->target = newBB;
-            } else if (CJump *j = terminator->asCJump()) {
-                if (outIdx == 0)
-                    j->iftrue = newBB;
-                else if (outIdx == 1)
-                    j->iffalse = newBB;
-                else
-                    Q_ASSERT(!"Invalid out edge index for CJUMP!");
-            } else if (terminator->asRet()) {
-                Q_ASSERT(!"A block with a RET at the end cannot have outgoing edges.");
-            } else {
-                Q_ASSERT(!"Unknown terminator!");
-            }
-
-//            qDebug() << "splitting edge" << fromBB->index() << "->" << toBB->index()
-//                     << "by inserting block" << newBB->index();
-
-            // Set the immediate dominator of the new block to inBB
-            df.setImmediateDominator(newBB, fromBB);
-
-            bool toNeedsNewIdom = true;
-            for (BasicBlock *bb : toBB->in) {
-                if (bb != newBB && bb != toBB && !df.dominates(toBB, bb)) {
-                    toNeedsNewIdom = false;
-                    break;
-                }
-            }
-            if (toNeedsNewIdom)
-                df.setImmediateDominator(toBB, newBB);
-        }
-    }
-}
-
-// Detect all (sub-)loops in a function.
-//
-// Doing loop detection on the CFG is better than relying on the statement information in
-// order to mark loops. Although JavaScript only has natural loops, it can still be the case
-// that something is not a loop even though a loop-like-statement is in the source. For
-// example:
-//    while (true) {
-//      if (i > 0)
-//        break;
-//      else
-//        break;
-//    }
-//
-// Algorithm:
-//  - do a DFS on the dominator tree, where for each node:
-//    - collect all back-edges
-//    - if there are back-edges, the node is a loop-header for a new loop, so:
-//      - walk the CFG is reverse-direction, and for every node:
-//        - if the node already belongs to a loop, we've found a nested loop:
-//          - get the loop-header for the (outermost) nested loop
-//          - add that loop-header to the current loop
-//          - continue by walking all incoming edges that do not yet belong to the current loop
-//        - if the node does not belong to a loop yet, add it to the current loop, and
-//          go on with all incoming edges
-//
-// Loop-header detection by checking for back-edges is very straight forward: a back-edge is
-// an incoming edge where the other node is dominated by the current node. Meaning: all
-// execution paths that reach that other node have to go through the current node, that other
-// node ends with a (conditional) jump back to the loop header.
-//
-// The exact order of the DFS on the dominator tree is not important. The only property has to
-// be that a node is only visited when all the nodes it dominates have been visited before.
-// The reason for the DFS is that for nested loops, the inner loop's loop-header is dominated
-// by the outer loop's header. So, by visiting depth-first, sub-loops are identified before
-// their containing loops, which makes nested-loop identification free. An added benefit is
-// that the nodes for those sub-loops are only processed once.
-//
-// Note: independent loops that share the same header are merged together. For example, in
-// the code snippet below, there are 2 back-edges into the loop-header, but only one single
-// loop will be detected.
-//    while (a) {
-//      if (b)
-//        continue;
-//      else
-//        continue;
-//    }
-class LoopDetection
-{
-    enum { DebugLoopDetection = 0 };
-
-    Q_DISABLE_COPY(LoopDetection)
-
-public:
-    struct LoopInfo
-    {
-        BasicBlock *loopHeader;
-        QVector<BasicBlock *> loopBody;
-        QVector<LoopInfo *> nestedLoops;
-        LoopInfo *parentLoop;
-
-        LoopInfo(BasicBlock *loopHeader = 0)
-            : loopHeader(loopHeader)
-            , parentLoop(0)
-        {}
-
-        bool isValid() const
-        { return loopHeader != 0; }
-
-        void addNestedLoop(LoopInfo *nested)
-        {
-            Q_ASSERT(nested);
-            Q_ASSERT(!nestedLoops.contains(nested));
-            Q_ASSERT(nested->parentLoop == 0);
-            nested->parentLoop = this;
-            nestedLoops.append(nested);
-        }
-    };
-
-public:
-    LoopDetection(const DominatorTree &dt)
-        : dt(dt)
-    {}
-
-    ~LoopDetection()
-    {
-        qDeleteAll(loopInfos);
-    }
-
-    void run(IR::Function *function)
-    {
-        std::vector<BasicBlock *> backedges;
-        backedges.reserve(4);
-
-        const auto order = dt.calculateDFNodeIterOrder();
-        for (BasicBlock *bb : order) {
-            Q_ASSERT(!bb->isRemoved());
-
-            backedges.clear();
-
-            for (BasicBlock *in : bb->in)
-                if (bb == in || dt.dominates(bb, in))
-                    backedges.push_back(in);
-
-            if (!backedges.empty()) {
-                subLoop(bb, backedges);
-            }
-        }
-
-        createLoopInfos(function);
-        dumpLoopInfo();
-    }
-
-    void dumpLoopInfo() const
-    {
-        if (!DebugLoopDetection)
-            return;
-
-        qDebug() << "Found" << loopInfos.size() << "loops";
-        for (const LoopInfo *info : loopInfos) {
-            qDebug() << "Loop header:" << info->loopHeader->index()
-                     << "for loop" << quint64(info);
-            for (BasicBlock *bb : info->loopBody)
-                qDebug() << "    " << bb->index();
-            for (LoopInfo *nested : info->nestedLoops)
-                qDebug() << "    sub loop:" << quint64(nested);
-            qDebug() << "     parent loop:" << quint64(info->parentLoop);
-        }
-    }
-
-    QVector<LoopInfo *> allLoops() const
-    { return loopInfos; }
-
-    // returns all loop headers for loops that have no nested loops.
-    QVector<LoopInfo *> innermostLoops() const
-    {
-        QVector<LoopInfo *> inner(loopInfos);
-
-        for (int i = 0; i < inner.size(); ) {
-            if (inner.at(i)->nestedLoops.isEmpty())
-                ++i;
-            else
-                inner.remove(i);
-        }
-
-        return inner;
-    }
-
-private:
-    void subLoop(BasicBlock *loopHead, const std::vector<BasicBlock *> &backedges)
-    {
-        loopHead->markAsGroupStart();
-        LoopInfo *info = new LoopInfo;
-        info->loopHeader = loopHead;
-        loopInfos.append(info);
-
-        std::vector<BasicBlock *> worklist;
-        worklist.reserve(backedges.size() + 8);
-        worklist.insert(worklist.end(), backedges.begin(), backedges.end());
-        while (!worklist.empty()) {
-            BasicBlock *predIt = worklist.back();
-            worklist.pop_back();
-
-            BasicBlock *subloop = predIt->containingGroup();
-            if (subloop) {
-                // This is a discovered block. Find its outermost discovered loop.
-                while (BasicBlock *parentLoop = subloop->containingGroup())
-                  subloop = parentLoop;
-
-                // If it is already discovered to be a subloop of this loop, continue.
-                if (subloop == loopHead)
-                    continue;
-
-                // Yay, it's a subloop of this loop.
-                subloop->setContainingGroup(loopHead);
-                predIt = subloop;
-
-                // Add all predecessors of the subloop header to the worklist, as long as
-                // those predecessors are not in the current subloop. It might be the case
-                // that they are in other loops, which we will then add as a subloop to the
-                // current loop.
-                for (BasicBlock *predIn : predIt->in)
-                    if (predIn->containingGroup() != subloop)
-                        worklist.push_back(predIn);
-            } else {
-                if (predIt == loopHead)
-                    continue;
-
-                // This is an undiscovered block. Map it to the current loop.
-                predIt->setContainingGroup(loopHead);
-
-                // Add all incoming edges to the worklist.
-                for (BasicBlock *bb : predIt->in)
-                    worklist.push_back(bb);
-            }
-        }
-    }
-
-private:
-    const DominatorTree &dt;
-    QVector<LoopInfo *> loopInfos;
-
-    void createLoopInfos(IR::Function *function)
-    {
-        for (BasicBlock *bb : function->basicBlocks()) {
-            if (bb->isRemoved())
-                continue;
-            if (BasicBlock *loopHeader = bb->containingGroup())
-                findLoop(loopHeader)->loopBody.append(bb);
-        }
-
-        for (int i = 0, size = loopInfos.size(); i < size; ++i) {
-            if (BasicBlock *containingLoopHeader = loopInfos.at(i)->loopHeader->containingGroup())
-                findLoop(containingLoopHeader)->addNestedLoop(loopInfos.at(i));
-        }
-    }
-
-    LoopInfo *findLoop(BasicBlock *loopHeader)
-    {
-        for (LoopInfo *info : qAsConst(loopInfos)) {
-            if (info->loopHeader == loopHeader)
-                return info;
-        }
-
-        Q_UNREACHABLE();
-        return nullptr;
-    }
-};
-
-// High-level algorithm:
-//  0. start with the first node (the start node) of a function
-//  1. emit the node
-//  2. add all outgoing edges that are not yet emitted to the postponed stack
-//  3. When the postponed stack is empty, pop a stack from the loop stack. If that is empty too,
-//     we're done.
-//  4. pop a node from the postponed stack, and check if it can be scheduled:
-//     a. if all incoming edges are scheduled, go to 4.
-//     b. if an incoming edge is unscheduled, but it's a back-edge (an edge in a loop that jumps
-//        back to the start of the loop), ignore it
-//     c. if there is any unscheduled edge that is not a back-edge, ignore this node, and go to 4.
-//  5. if this node is the start of a loop, push the postponed stack on the loop stack.
-//  6. go back to 1.
-//
-// The postponing action in step 2 will put the node into its containing group. The case where this
-// is important is when a (labeled) continue or a (labeled) break statement occur in a loop: the
-// outgoing edge points to a node that is not part of the current loop (and possibly not of the
-// parent loop).
-//
-// Linear scan register allocation benefits greatly from short life-time intervals with few holes
-// (see for example section 4 (Lifetime Analysis) of [Wimmer1]). This algorithm makes sure that the
-// blocks of a group are scheduled together, with no non-loop blocks in between. This applies
-// recursively for nested loops. It also schedules groups of if-then-else-endif blocks together for
-// the same reason.
-class BlockScheduler
-{
-    enum { DebugBlockScheduler = 0 };
-
-    IR::Function *function;
-    const DominatorTree &dominatorTree;
-
-    struct WorkForGroup
-    {
-        BasicBlock *group;
-        QStack<BasicBlock *> postponed;
-
-        WorkForGroup(BasicBlock *group = 0): group(group) {}
-    };
-    WorkForGroup currentGroup;
-    QStack<WorkForGroup> postponedGroups;
-    QVector<BasicBlock *> sequence;
-    ProcessedBlocks emitted;
-    QHash<BasicBlock *, BasicBlock *> loopsStartEnd;
-
-    bool checkCandidate(BasicBlock *candidate)
-    {
-        Q_ASSERT(candidate->containingGroup() == currentGroup.group);
-
-        for (BasicBlock *in : candidate->in) {
-            if (emitted.alreadyProcessed(in))
-                continue;
-
-            if (dominatorTree.dominates(candidate, in))
-                // this is a loop, where there in -> candidate edge is the jump back to the top of the loop.
-                continue;
-
-            if (in == candidate)
-                // this is a very tight loop, e.g.:
-                //   L1: ...
-                //       goto L1
-                // This can happen when, for example, the basic-block merging gets rid of the empty
-                // body block. In this case, we can safely schedule this block (if all other
-                // incoming edges are either loop-back edges, or have been scheduled already).
-                continue;
-
-            return false; // an incoming edge that is not yet emitted, and is not a back-edge
-        }
-
-        if (candidate->isGroupStart()) {
-            // postpone everything, and schedule the loop first.
-            postponedGroups.push(currentGroup);
-            currentGroup = WorkForGroup(candidate);
-        }
-
-        return true;
-    }
-
-    BasicBlock *pickNext()
-    {
-        while (true) {
-            while (currentGroup.postponed.isEmpty()) {
-                if (postponedGroups.isEmpty())
-                    return 0;
-                if (currentGroup.group) // record the first and the last node of a group
-                    loopsStartEnd.insert(currentGroup.group, sequence.last());
-                currentGroup = postponedGroups.pop();
-            }
-
-            BasicBlock *next = currentGroup.postponed.pop();
-            if (checkCandidate(next))
-                return next;
-        }
-
-        Q_UNREACHABLE();
-        return 0;
-    }
-
-    void emitBlock(BasicBlock *bb)
-    {
-        Q_ASSERT(!bb->isRemoved());
-        if (emitted.alreadyProcessed(bb))
-            return;
-
-        sequence.append(bb);
-        emitted.markAsProcessed(bb);
-    }
-
-    void schedule(BasicBlock *functionEntryPoint)
-    {
-        BasicBlock *next = functionEntryPoint;
-
-        while (next) {
-            emitBlock(next);
-            for (int i = next->out.size(); i != 0; ) {
-                // postpone all outgoing edges, if they were not already processed
-                --i;
-                BasicBlock *out = next->out[i];
-                if (!emitted.alreadyProcessed(out))
-                    postpone(out);
-            }
-            next = pickNext();
-        }
-    }
-
-    void postpone(BasicBlock *bb)
-    {
-        if (currentGroup.group == bb->containingGroup()) {
-            currentGroup.postponed.append(bb);
-            return;
-        }
-
-        for (int i = postponedGroups.size(); i != 0; ) {
-            --i;
-            WorkForGroup &g = postponedGroups[i];
-            if (g.group == bb->containingGroup()) {
-                g.postponed.append(bb);
-                return;
-            }
-        }
-
-        Q_UNREACHABLE();
-    }
-
-    void dumpLoopStartsEnds() const
-    {
-        qDebug() << "Found" << loopsStartEnd.size() << "loops:";
-        for (auto key : loopsStartEnd.keys())
-            qDebug("Loop starting at L%d ends at L%d.", key->index(),
-                   loopsStartEnd.value(key)->index());
-    }
-
-public:
-    BlockScheduler(IR::Function *function, const DominatorTree &dominatorTree)
-        : function(function)
-        , dominatorTree(dominatorTree)
-        , sequence(0)
-        , emitted(function)
-    {}
-
-    QHash<BasicBlock *, BasicBlock *> go()
-    {
-        showMeTheCode(function, "Before block scheduling");
-        if (DebugBlockScheduler)
-            dominatorTree.dumpImmediateDominators();
-
-        schedule(function->basicBlock(0));
-
-        Q_ASSERT(function->liveBasicBlocksCount() == sequence.size());
-        function->setScheduledBlocks(sequence);
-        if (DebugBlockScheduler)
-            dumpLoopStartsEnds();
-        return loopsStartEnd;
-    }
-};
-
-#ifndef QT_NO_DEBUG
-void checkCriticalEdges(const QVector<BasicBlock *> &basicBlocks) {
-    for (BasicBlock *bb : basicBlocks) {
-        if (bb && bb->out.size() > 1) {
-            for (BasicBlock *bb2 : bb->out) {
-                if (bb2 && bb2->in.size() > 1) {
-                    qDebug() << "found critical edge between block"
-                             << bb->index() << "and block" << bb2->index();
-                    Q_ASSERT(false);
-                }
-            }
-        }
-    }
-}
-#endif
-
-static void cleanupBasicBlocks(IR::Function *function)
-{
-    showMeTheCode(function, "Before basic block cleanup");
-
-    // Algorithm: this is the iterative version of a depth-first search for all blocks that are
-    // reachable through outgoing edges, starting with the start block and all exception handler
-    // blocks.
-    QBitArray reachableBlocks(function->basicBlockCount());
-    QVarLengthArray<BasicBlock *, 16> postponed;
-    for (int i = 0, ei = function->basicBlockCount(); i != ei; ++i) {
-        BasicBlock *bb = function->basicBlock(i);
-        if (i == 0 || bb->isExceptionHandler())
-            postponed.append(bb);
-    }
-
-    while (!postponed.isEmpty()) {
-        BasicBlock *bb = postponed.back();
-        postponed.pop_back();
-        if (bb->isRemoved()) // this block was removed before, we don't need to clean it up.
-            continue;
-
-        reachableBlocks.setBit(bb->index());
-
-        for (BasicBlock *outBB : bb->out) {
-            if (!reachableBlocks.at(outBB->index()))
-                postponed.append(outBB);
-        }
-    }
-
-    for (BasicBlock *bb : function->basicBlocks()) {
-        if (bb->isRemoved()) // the block has already been removed, so ignore it
-            continue;
-        if (reachableBlocks.at(bb->index())) // the block is reachable, so ignore it
-            continue;
-
-        for (BasicBlock *outBB : bb->out) {
-            if (outBB->isRemoved() || !reachableBlocks.at(outBB->index()))
-                continue; // We do not need to unlink from blocks that are scheduled to be removed.
-
-            int idx = outBB->in.indexOf(bb);
-            if (idx != -1) {
-                outBB->in.remove(idx);
-                for (Stmt *s : outBB->statements()) {
-                    if (Phi *phi = s->asPhi())
-                        phi->incoming.remove(idx);
-                    else
-                        break;
-                }
-            }
-        }
-
-        function->removeBasicBlock(bb);
-    }
-
-    showMeTheCode(function, "After basic block cleanup");
-}
-
-inline Const *isConstPhi(Phi *phi)
-{
-    if (Const *c = phi->incoming[0]->asConst()) {
-        for (int i = 1, ei = phi->incoming.size(); i != ei; ++i) {
-            if (Const *cc = phi->incoming[i]->asConst()) {
-                if (c->value != cc->value)
-                    return 0;
-                if (!(c->type == cc->type || (c->type & NumberType && cc->type & NumberType)))
-                    return 0;
-                if (int(c->value) == 0 && int(cc->value) == 0)
-                    if (isNegative(c->value) != isNegative(cc->value))
-                        return 0;
-            } else {
-                return 0;
-            }
-        }
-        return c;
-    }
-    return 0;
-}
-
-static Expr *clone(Expr *e, IR::Function *function) {
-    if (Temp *t = e->asTemp()) {
-        return CloneExpr::cloneTemp(t, function);
-    } else if (Const *c = e->asConst()) {
-        return CloneExpr::cloneConst(c, function);
-    } else if (Name *n = e->asName()) {
-        return CloneExpr::cloneName(n, function);
-    } else {
-        Q_UNREACHABLE();
-        return e;
-    }
-}
-
-class ExprReplacer
-{
-    DefUses &_defUses;
-    IR::Function* _function;
-    Temp *_toReplace;
-    Expr *_replacement;
-
-public:
-    ExprReplacer(DefUses &defUses, IR::Function *function)
-        : _defUses(defUses)
-        , _function(function)
-        , _toReplace(0)
-        , _replacement(0)
-    {}
-
-    bool operator()(Temp *toReplace, Expr *replacement, StatementWorklist &W, QVector<Stmt *> *newUses = 0)
-    {
-        Q_ASSERT(replacement->asTemp() || replacement->asConst() || replacement->asName());
-
-        qSwap(_toReplace, toReplace);
-        qSwap(_replacement, replacement);
-
-        const QVector<Stmt *> &uses = _defUses.uses(*_toReplace);
-
-        // Prevent the following:
-        //   L3:
-        //     %1 = phi L1: %2, L2: %3
-        //     %4 = phi L1: %5, L2: %6
-        //     %6 = %1
-        // From turning into:
-        //   L3:
-        //     %1 = phi L1: %2, L2: %3
-        //     %4 = phi L1: %5, L2: %1
-        //
-        // Because both phi nodes are "executed in parallel", we cannot replace %6 by %1 in the
-        // second phi node. So, if the defining statement for a temp is a phi node, and one of the
-        // uses of the to-be-replaced statement is a phi node in the same block as the defining
-        // statement, bail out.
-        if (Temp *r = _replacement->asTemp()) {
-            if (_defUses.defStmt(*r)->asPhi()) {
-                BasicBlock *replacementDefBlock = _defUses.defStmtBlock(*r);
-                for (Stmt *use : uses) {
-                    if (Phi *usePhi = use->asPhi()) {
-                        if (_defUses.defStmtBlock(*usePhi->targetTemp) == replacementDefBlock)
-                            return false;
-                    }
-                }
-            }
-        }
-
-//        qout << "Replacing ";toReplace->dump(qout);qout<<" by ";replacement->dump(qout);qout<<endl;
-
-        if (newUses)
-            newUses->reserve(uses.size());
-
-//        qout << "        " << uses.size() << " uses:"<<endl;
-        for (Stmt *use : uses) {
-//            qout<<"        ";use->dump(qout);qout<<"\n";
-            visit(use);
-//            qout<<"     -> ";use->dump(qout);qout<<"\n";
-            W += use;
-            if (newUses)
-                newUses->push_back(use);
-        }
-
-        qSwap(_replacement, replacement);
-        qSwap(_toReplace, toReplace);
-        return true;
-    }
-
-private:
-    void visit(Expr *e)
-    {
-        if (auto c = e->asConst()) {
-            visitConst(c);
-        } else if (auto s = e->asString()) {
-            visitString(s);
-        } else if (auto r = e->asRegExp()) {
-            visitRegExp(r);
-        } else if (auto n = e->asName()) {
-            visitName(n);
-        } else if (auto t = e->asTemp()) {
-            visitTemp(t);
-        } else if (auto a = e->asArgLocal()) {
-            visitArgLocal(a);
-        } else if (auto c = e->asClosure()) {
-            visitClosure(c);
-        } else if (auto c = e->asConvert()) {
-            visitConvert(c);
-        } else if (auto u = e->asUnop()) {
-            visitUnop(u);
-        } else if (auto b = e->asBinop()) {
-            visitBinop(b);
-        } else if (auto c = e->asCall()) {
-            visitCall(c);
-        } else if (auto n = e->asNew()) {
-            visitNew(n);
-        } else if (auto s = e->asSubscript()) {
-            visitSubscript(s);
-        } else if (auto m = e->asMember()) {
-            visitMember(m);
-        } else {
-            Q_UNREACHABLE();
-        }
-    }
-
-    void visitConst(Const *) {}
-    void visitString(IR::String *) {}
-    void visitRegExp(IR::RegExp *) {}
-    void visitName(Name *) {}
-    void visitTemp(Temp *) {}
-    void visitArgLocal(ArgLocal *) {}
-    void visitClosure(Closure *) {}
-    void visitConvert(Convert *e) { check(e->expr); }
-    void visitUnop(Unop *e) { check(e->expr); }
-    void visitBinop(Binop *e) { check(e->left); check(e->right); }
-    void visitCall(Call *e) {
-        check(e->base);
-        for (ExprList *it = e->args; it; it = it->next)
-            check(it->expr);
-    }
-    void visitNew(New *e) {
-        check(e->base);
-        for (ExprList *it = e->args; it; it = it->next)
-            check(it->expr);
-    }
-    void visitSubscript(Subscript *e) { check(e->base); check(e->index); }
-    void visitMember(Member *e) { check(e->base); }
-
-    void visit(Stmt *s)
-    {
-        if (auto e = s->asExp()) {
-            visitExp(e);
-        } else if (auto m = s->asMove()) {
-            visitMove(m);
-        } else if (auto j = s->asJump()) {
-            visitJump(j);
-        } else if (auto c = s->asCJump()) {
-            visitCJump(c);
-        } else if (auto r = s->asRet()) {
-            visitRet(r);
-        } else if (auto p = s->asPhi()) {
-            visitPhi(p);
-        } else {
-            Q_UNREACHABLE();
-        }
-    }
-
-    void visitExp(Exp *s) { check(s->expr); }
-    void visitMove(Move *s) { check(s->target); check(s->source); }
-    void visitJump(Jump *) {}
-    void visitCJump(CJump *s) { check(s->cond); }
-    void visitRet(Ret *s) { check(s->expr); }
-    void visitPhi(Phi *s) {
-        for (int i = 0, ei = s->incoming.size(); i != ei; ++i)
-            check(s->incoming[i]);
-    }
-
-private:
-    void check(Expr *&e) {
-        if (equals(e, _toReplace)) {
-            e = clone(_replacement, _function);
-        } else {
-            visit(e);
-        }
-    }
-
-    // This only calculates equality for everything needed by constant propagation
-    bool equals(Expr *e1, Expr *e2) const {
-        if (e1 == e2)
-            return true;
-
-        if (Const *c1 = e1->asConst()) {
-            if (Const *c2 = e2->asConst())
-                return c1->value == c2->value && (c1->type == c2->type || (c1->type & NumberType && c2->type & NumberType));
-        } else if (Temp *t1 = e1->asTemp()) {
-            if (Temp *t2 = e2->asTemp())
-                return *t1 == *t2;
-        } else if (Name *n1 = e1->asName()) {
-            if (Name *n2 = e2->asName()) {
-                if (n1->id) {
-                    if (n2->id)
-                        return *n1->id == *n2->id;
-                } else {
-                    return n1->builtin == n2->builtin;
-                }
-            }
-        }
-
-        if (e1->type == IR::NullType && e2->type == IR::NullType)
-            return true;
-        if (e1->type == IR::UndefinedType && e2->type == IR::UndefinedType)
-            return true;
-
-        return false;
-    }
-};
-
-namespace {
-/// This function removes the basic-block from the function's list, unlinks any uses and/or defs,
-/// and removes unreachable staements from the worklist, so that optimiseSSA won't consider them
-/// anymore.
-void unlink(BasicBlock *from, BasicBlock *to, IR::Function *func, DefUses &defUses,
-            StatementWorklist &W, DominatorTree &dt)
-{
-    enum { DebugUnlinking = 0 };
-
-    struct Util {
-        static void removeIncomingEdge(BasicBlock *from, BasicBlock *to, DefUses &defUses, StatementWorklist &W)
-        {
-            int idx = to->in.indexOf(from);
-            if (idx == -1)
-                return;
-
-            to->in.remove(idx);
-            for (Stmt *outStmt : to->statements()) {
-                if (!outStmt)
-                    continue;
-                if (Phi *phi = outStmt->asPhi()) {
-                    if (Temp *t = phi->incoming[idx]->asTemp()) {
-                        defUses.removeUse(phi, *t);
-                        W += defUses.defStmt(*t);
-                    }
-                    phi->incoming.remove(idx);
-                    W += phi;
-                } else {
-                    break;
-                }
-            }
-        }
-
-        static bool isReachable(BasicBlock *bb, const DominatorTree &dt)
-        {
-            for (BasicBlock *in : bb->in) {
-                if (in->isRemoved())
-                    continue;
-                if (dt.dominates(bb, in)) // a back-edge, not interesting
-                    continue;
-                return true;
-            }
-
-            return false;
-        }
-    };
-
-    Q_ASSERT(!from->isRemoved());
-    Q_ASSERT(!to->isRemoved());
-
-    // don't purge blocks that are entry points for catch statements. They might not be directly
-    // connected, but are required anyway
-    if (to->isExceptionHandler())
-        return;
-
-    if (DebugUnlinking)
-        qDebug("Unlinking L%d -> L%d...", from->index(), to->index());
-
-    // First, unlink the edge
-    from->out.removeOne(to);
-    Util::removeIncomingEdge(from, to, defUses, W);
-
-    BasicBlockSet siblings;
-    siblings.init(func);
-
-    // Check if the target is still reachable...
-    if (Util::isReachable(to, dt)) { // yes, recalculate the immediate dominator, and we're done.
-        if (DebugUnlinking)
-            qDebug(".. L%d is still reachable, recalulate idom.", to->index());
-        dt.collectSiblings(to, siblings);
-    } else {
-        if (DebugUnlinking)
-            qDebug(".. L%d is unreachable, purging it:", to->index());
-        // The target is unreachable, so purge it:
-        QVector<BasicBlock *> toPurge;
-        toPurge.reserve(8);
-        toPurge.append(to);
-        while (!toPurge.isEmpty()) {
-            BasicBlock *bb = toPurge.first();
-            toPurge.removeFirst();
-            if (DebugUnlinking)
-                qDebug("... purging L%d", bb->index());
-
-            if (bb->isRemoved())
-                continue;
-
-            // unlink all incoming edges
-            for (BasicBlock *in : bb->in) {
-                int idx = in->out.indexOf(bb);
-                if (idx != -1)
-                    in->out.remove(idx);
-            }
-
-            // unlink all outgoing edges, including "arguments" to phi statements
-            for (BasicBlock *out : bb->out) {
-                if (out->isRemoved())
-                    continue;
-
-                Util::removeIncomingEdge(bb, out, defUses, W);
-
-                if (Util::isReachable(out, dt)) {
-                    dt.collectSiblings(out, siblings);
-                } else {
-                    // if a successor has no incoming edges after unlinking the current basic block,
-                    // then it is unreachable, and can be purged too
-                    toPurge.append(out);
-                }
-            }
-
-            // unlink all defs/uses from the statements in the basic block
-            for (Stmt *s : bb->statements()) {
-                if (!s)
-                    continue;
-
-                W += defUses.removeDefUses(s);
-                W -= s;
-            }
-
-            siblings.remove(bb);
-            dt.setImmediateDominator(bb, 0);
-            func->removeBasicBlock(bb);
-        }
-    }
-
-    dt.recalculateIDoms(siblings);
-    if (DebugUnlinking)
-        qDebug("Unlinking done.");
-}
-
-bool tryOptimizingComparison(Expr *&expr)
-{
-    Binop *b = expr->asBinop();
-    if (!b)
-        return false;
-    Const *leftConst = b->left->asConst();
-    if (!leftConst || leftConst->type == StringType || leftConst->type == VarType || leftConst->type == QObjectType)
-        return false;
-    Const *rightConst = b->right->asConst();
-    if (!rightConst || rightConst->type == StringType || rightConst->type == VarType || rightConst->type == QObjectType)
-        return false;
-
-    QV4::Primitive l = convertToValue(leftConst);
-    QV4::Primitive r = convertToValue(rightConst);
-
-    switch (b->op) {
-    case OpGt:
-        leftConst->value = Runtime::method_compareGreaterThan(l, r);
-        leftConst->type = BoolType;
-        expr = leftConst;
-        return true;
-    case OpLt:
-        leftConst->value = Runtime::method_compareLessThan(l, r);
-        leftConst->type = BoolType;
-        expr = leftConst;
-        return true;
-    case OpGe:
-        leftConst->value = Runtime::method_compareGreaterEqual(l, r);
-        leftConst->type = BoolType;
-        expr = leftConst;
-        return true;
-    case OpLe:
-        leftConst->value = Runtime::method_compareLessEqual(l, r);
-        leftConst->type = BoolType;
-        expr = leftConst;
-        return true;
-    case OpStrictEqual:
-        leftConst->value = Runtime::method_compareStrictEqual(l, r);
-        leftConst->type = BoolType;
-        expr = leftConst;
-        return true;
-    case OpEqual:
-        leftConst->value = Runtime::method_compareEqual(l, r);
-        leftConst->type = BoolType;
-        expr = leftConst;
-        return true;
-    case OpStrictNotEqual:
-        leftConst->value = Runtime::method_compareStrictNotEqual(l, r);
-        leftConst->type = BoolType;
-        expr = leftConst;
-        return true;
-    case OpNotEqual:
-        leftConst->value = Runtime::method_compareNotEqual(l, r);
-        leftConst->type = BoolType;
-        expr = leftConst;
-        return true;
-    default:
-        break;
-    }
-
-    return false;
-}
-
-void cfg2dot(IR::Function *f, const QVector<LoopDetection::LoopInfo *> &loops = QVector<LoopDetection::LoopInfo *>())
-{
-    static const bool showCode = qEnvironmentVariableIsSet("QV4_SHOW_IR");
-    if (!showCode)
-        return;
-
-    QBuffer buf;
-    buf.open(QIODevice::WriteOnly);
-    QTextStream qout(&buf);
-
-    struct Util {
-        QTextStream &qout;
-        Util(QTextStream &qout): qout(qout) {}
-        void genLoop(const LoopDetection::LoopInfo *loop)
-        {
-            qout << "  subgraph \"cluster" << quint64(loop) << "\" {\n";
-            qout << "    L" << loop->loopHeader->index() << ";\n";
-            for (BasicBlock *bb : loop->loopBody)
-                qout << "    L" << bb->index() << ";\n";
-            for (LoopDetection::LoopInfo *nested : loop->nestedLoops)
-                genLoop(nested);
-            qout << "  }\n";
-        }
-    };
-
-    QString name;
-    if (f->name) name = *f->name;
-    else name = QStringLiteral("%1").arg((unsigned long long)f);
-    qout << "digraph \"" << name << "\" { ordering=out;\n";
-
-    for (LoopDetection::LoopInfo *l : loops) {
-        if (l->parentLoop == 0)
-            Util(qout).genLoop(l);
-    }
-
-    for (BasicBlock *bb : f->basicBlocks()) {
-        if (bb->isRemoved())
-            continue;
-
-        int idx = bb->index();
-        qout << "  L" << idx << " [label=\"L" << idx << "\"";
-        if (idx == 0 || bb->terminator()->asRet())
-            qout << ", shape=doublecircle";
-        else
-            qout << ", shape=circle";
-        qout << "];\n";
-        for (BasicBlock *out : bb->out)
-            qout << "  L" << idx << " -> L" << out->index() << "\n";
-    }
-
-    qout << "}\n";
-    buf.close();
-    qDebug("%s", buf.data().constData());
-}
-
-} // anonymous namespace
-
-void optimizeSSA(StatementWorklist &W, DefUses &defUses, DominatorTree &df)
-{
-    IR::Function *function = W.function();
-    ExprReplacer replaceUses(defUses, function);
-
-    Stmt *s = 0;
-    while ((s = W.takeNext(s))) {
-
-        if (Phi *phi = s->asPhi()) {
-            // dead code elimination:
-            if (defUses.useCount(*phi->targetTemp) == 0) {
-                W += defUses.removeDefUses(phi);
-                W.remove(s);
-                continue;
-            }
-
-            // constant propagation:
-            if (Const *c = isConstPhi(phi)) {
-                replaceUses(phi->targetTemp, c, W);
-                defUses.removeDef(*phi->targetTemp);
-                W.remove(s);
-                continue;
-            }
-
-            // copy propagation:
-            if (phi->incoming.size() == 1) {
-                Temp *t = phi->targetTemp;
-                Expr *e = phi->incoming.first();
-
-                QVector<Stmt *> newT2Uses;
-                replaceUses(t, e, W, &newT2Uses);
-                if (Temp *t2 = e->asTemp()) {
-                    defUses.removeUse(s, *t2);
-                    defUses.addUses(*t2, newT2Uses);
-                    W += defUses.defStmt(*t2);
-                }
-                defUses.removeDef(*t);
-                W.remove(s);
-                continue;
-            }
-        } else  if (Move *m = s->asMove()) {
-            if (Convert *convert = m->source->asConvert()) {
-                if (Const *sourceConst = convert->expr->asConst()) {
-                    convertConst(sourceConst, convert->type);
-                    m->source = sourceConst;
-                    W += m;
-                    continue;
-                } else if (Temp *sourceTemp = convert->expr->asTemp()) {
-                    if (sourceTemp->type == convert->type) {
-                        m->source = sourceTemp;
-                        W += m;
-                        continue;
-                    }
-                }
-            }
-
-            if (Temp *targetTemp = m->target->asTemp()) {
-                // dead code elimination:
-                if (defUses.useCount(*targetTemp) == 0) {
-                    EliminateDeadCode(defUses, W).run(m->source, s);
-                    if (!m->source)
-                        W.remove(s);
-                    continue;
-                }
-
-                // constant propagation:
-                if (Const *sourceConst = m->source->asConst()) {
-                    Q_ASSERT(sourceConst->type != UnknownType);
-                    replaceUses(targetTemp, sourceConst, W);
-                    defUses.removeDef(*targetTemp);
-                    W.remove(s);
-                    continue;
-                }
-                if (Member *member = m->source->asMember()) {
-                    if (member->kind == Member::MemberOfEnum) {
-                        Const *c = function->New<Const>();
-                        const int enumValue = member->enumValue;
-                        c->init(SInt32Type, enumValue);
-                        replaceUses(targetTemp, c, W);
-                        defUses.removeDef(*targetTemp);
-                        W.remove(s);
-                        defUses.removeUse(s, *member->base->asTemp());
-                        continue;
-                    } else if (member->kind != IR::Member::MemberOfIdObjectsArray && member->attachedPropertiesId != 0 && member->property && member->base->asTemp()) {
-                        // Attached properties have no dependency on their base. Isel doesn't
-                        // need it and we can eliminate the temp used to initialize it.
-                        defUses.removeUse(s, *member->base->asTemp());
-                        Const *c = function->New<Const>();
-                        c->init(SInt32Type, 0);
-                        member->base = c;
-                        continue;
-                    }
-                }
-
-                // copy propagation:
-                if (Temp *sourceTemp = m->source->asTemp()) {
-                    QVector<Stmt *> newT2Uses;
-                    if (replaceUses(targetTemp, sourceTemp, W, &newT2Uses)) {
-                        defUses.removeUse(s, *sourceTemp);
-                        defUses.addUses(*sourceTemp, newT2Uses);
-                        defUses.removeDef(*targetTemp);
-                        W.remove(s);
-                    }
-                    continue;
-                }
-
-                if (Unop *unop = m->source->asUnop()) {
-                    // Constant unary expression evaluation:
-                    if (Const *constOperand = unop->expr->asConst()) {
-                        if (constOperand->type & NumberType || constOperand->type == BoolType) {
-                            // TODO: implement unop propagation for other constant types
-                            bool doneSomething = false;
-                            switch (unop->op) {
-                            case OpNot:
-                                constOperand->value = !constOperand->value;
-                                constOperand->type = BoolType;
-                                doneSomething = true;
-                                break;
-                            case OpUMinus:
-                                if (int(constOperand->value) == 0 && int(constOperand->value) == constOperand->value) {
-                                    if (isNegative(constOperand->value))
-                                        constOperand->value = 0;
-                                    else
-                                        constOperand->value = -1 / Q_INFINITY;
-                                    constOperand->type = DoubleType;
-                                    doneSomething = true;
-                                    break;
-                                }
-
-                                constOperand->value = -constOperand->value;
-                                doneSomething = true;
-                                break;
-                            case OpUPlus:
-                                if (unop->type != UnknownType)
-                                    constOperand->type = unop->type;
-                                doneSomething = true;
-                                break;
-                            case OpCompl:
-                                constOperand->value = ~QV4::Primitive::toInt32(constOperand->value);
-                                constOperand->type = SInt32Type;
-                                doneSomething = true;
-                                break;
-                            case OpIncrement:
-                                constOperand->value = constOperand->value + 1;
-                                doneSomething = true;
-                                break;
-                            case OpDecrement:
-                                constOperand->value = constOperand->value - 1;
-                                doneSomething = true;
-                                break;
-                            default:
-                                break;
-                            };
-
-                            if (doneSomething) {
-                                m->source = constOperand;
-                                W += m;
-                            }
-                        }
-                    }
-                    // TODO: if the result of a unary not operation is only used in a cjump,
-                    //       then inline it.
-
-                    continue;
-                }
-
-                if (Binop *binop = m->source->asBinop()) {
-                    Const *leftConst = binop->left->asConst();
-                    Const *rightConst = binop->right->asConst();
-
-                    { // Typical casts to int32:
-                        Expr *casted = 0;
-                        switch (binop->op) {
-                        case OpBitAnd:
-                            if (leftConst && !rightConst && QV4::Primitive::toUInt32(leftConst->value) == 0xffffffff)
-                                casted = binop->right;
-                            else if (!leftConst && rightConst && QV4::Primitive::toUInt32(rightConst->value) == 0xffffffff)
-                                casted = binop->left;
-                            break;
-                        case OpBitOr:
-                            if (leftConst && !rightConst && QV4::Primitive::toInt32(leftConst->value) == 0)
-                                casted = binop->right;
-                            else if (!leftConst && rightConst && QV4::Primitive::toUInt32(rightConst->value) == 0)
-                                casted = binop->left;
-                            break;
-                        default:
-                            break;
-                        }
-                        if (casted && casted->type == SInt32Type) {
-                            m->source = casted;
-                            W += m;
-                            continue;
-                        }
-                    }
-                    if (rightConst) {
-                        switch (binop->op) {
-                        case OpLShift:
-                        case OpRShift:
-                            if (double v = QV4::Primitive::toInt32(rightConst->value) & 0x1f) {
-                                // mask right hand side of shift operations
-                                rightConst->value = v;
-                                rightConst->type = SInt32Type;
-                            } else {
-                                // shifting a value over 0 bits is a move:
-                                if (rightConst->value == 0) {
-                                    m->source = binop->left;
-                                    W += m;
-                                }
-                            }
-
-                            break;
-                        default:
-                            break;
-                        }
-                    }
-
-                    // TODO: More constant binary expression evaluation
-                    // TODO: If the result of the move is only used in one single cjump, then
-                    //       inline the binop into the cjump.
-                    if (!leftConst || leftConst->type == StringType || leftConst->type == VarType || leftConst->type == QObjectType)
-                        continue;
-                    if (!rightConst || rightConst->type == StringType || rightConst->type == VarType || rightConst->type == QObjectType)
-                        continue;
-
-                    QV4::Primitive lc = convertToValue(leftConst);
-                    QV4::Primitive rc = convertToValue(rightConst);
-                    double l = lc.toNumber();
-                    double r = rc.toNumber();
-
-                    switch (binop->op) {
-                    case OpMul:
-                        leftConst->value = l * r;
-                        leftConst->type = DoubleType;
-                        m->source = leftConst;
-                        W += m;
-                        break;
-                    case OpAdd:
-                        leftConst->value = l + r;
-                        leftConst->type = DoubleType;
-                        m->source = leftConst;
-                        W += m;
-                        break;
-                    case OpSub:
-                        leftConst->value = l - r;
-                        leftConst->type = DoubleType;
-                        m->source = leftConst;
-                        W += m;
-                        break;
-                    case OpDiv:
-                        leftConst->value = l / r;
-                        leftConst->type = DoubleType;
-                        m->source = leftConst;
-                        W += m;
-                        break;
-                    case OpMod:
-                        leftConst->value = std::fmod(l, r);
-                        leftConst->type = DoubleType;
-                        m->source = leftConst;
-                        W += m;
-                        break;
-                    default:
-                        if (tryOptimizingComparison(m->source))
-                            W += m;
-                        break;
-                    }
-
-                    continue;
-                }
-            } // TODO: var{#0} = double{%10} where %10 is defined once and used once. E.g.: function(t){t = t % 2; return t; }
-
-        } else if (CJump *cjump = s->asCJump()) {
-            if (Const *constantCondition = cjump->cond->asConst()) {
-                // Note: this assumes that there are no critical edges! Meaning, we can safely purge
-                //       any basic blocks that are found to be unreachable.
-                Jump *jump = function->NewStmt<Jump>();
-                W.registerNewStatement(jump);
-                if (convertToValue(constantCondition).toBoolean()) {
-                    jump->target = cjump->iftrue;
-                    unlink(cjump->parent, cjump->iffalse, function, defUses, W, df);
-                } else {
-                    jump->target = cjump->iffalse;
-                    unlink(cjump->parent, cjump->iftrue, function, defUses, W, df);
-                }
-                W.replace(s, jump);
-
-                continue;
-            } else if (cjump->cond->asBinop()) {
-                if (tryOptimizingComparison(cjump->cond))
-                    W += cjump;
-                continue;
-            }
-            // TODO: Constant unary expression evaluation
-            // TODO: if the expression is an unary not operation, lift the expression, and switch
-            //       the then/else blocks.
-        }
-    }
-
-    W.applyToFunction();
-}
-
-//### TODO: use DefUses from the optimizer, because it already has all this information
-class InputOutputCollector
-{
-    void setOutput(Temp *out)
-    {
-        Q_ASSERT(!output);
-        output = out;
-    }
-
-public:
-    std::vector<Temp *> inputs;
-    Temp *output;
-
-    InputOutputCollector()
-    { inputs.reserve(4); }
-
-    void collect(Stmt *s) {
-        inputs.resize(0);
-        output = 0;
-        visit(s);
-    }
-
-private:
-    void visit(Expr *e)
-    {
-        if (auto t = e->asTemp()) {
-            inputs.push_back(t);
-        } else {
-            EXPR_VISIT_ALL_KINDS(e);
-        }
-    }
-
-    void visit(Stmt *s)
-    {
-        if (auto m = s->asMove()) {
-            visit(m->source);
-            if (Temp *t = m->target->asTemp()) {
-                setOutput(t);
-            } else {
-                visit(m->target);
-            }
-        } else if (s->asPhi()) {
-            // Handled separately
-        } else {
-            STMT_VISIT_ALL_KINDS(s);
-        }
-    }
-};
-
-/*
- * The algorithm is described in:
- *
- *   Linear Scan Register Allocation on SSA Form
- *   Christian Wimmer & Michael Franz, CGO'10, April 24-28, 2010
- *
- * See LifeTimeIntervals::renumber for details on the numbering.
- */
-class LifeRanges {
-    class LiveRegs
-    {
-        typedef std::vector<int> Storage;
-        Storage regs;
-
-    public:
-        void insert(int r)
-        {
-            if (find(r) == end())
-                regs.push_back(r);
-        }
-
-        void unite(const LiveRegs &other)
-        {
-            if (other.empty())
-                return;
-            if (empty()) {
-                regs = other.regs;
-                return;
-            }
-            for (int r : other.regs)
-                insert(r);
-        }
-
-        typedef Storage::iterator iterator;
-        iterator find(int r)
-        { return std::find(regs.begin(), regs.end(), r); }
-
-        iterator begin()
-        { return regs.begin(); }
-
-        iterator end()
-        { return regs.end(); }
-
-        void erase(iterator it)
-        { regs.erase(it); }
-
-        void remove(int r)
-        {
-            iterator it = find(r);
-            if (it != end())
-                erase(it);
-        }
-
-        bool empty() const
-        { return regs.empty(); }
-
-        int size() const
-        { return int(regs.size()); }
-
-        int at(int idx) const
-        { return regs.at(idx); }
-    };
-
-    std::vector<LiveRegs> _liveIn;
-    std::vector<LifeTimeInterval *> _intervals;
-    LifeTimeIntervals::Ptr _sortedIntervals;
-
-    LifeTimeInterval &interval(const Temp *temp)
-    {
-        LifeTimeInterval *lti = _intervals[temp->index];
-        Q_ASSERT(lti);
-        return *lti;
-    }
-
-    void ensureInterval(const IR::Temp &temp)
-    {
-        Q_ASSERT(!temp.isInvalid());
-        LifeTimeInterval *&lti = _intervals[temp.index];
-        if (lti)
-            return;
-        lti = new LifeTimeInterval;
-        lti->setTemp(temp);
-    }
-
-    int defPosition(IR::Stmt *s) const
-    {
-        return usePosition(s) + 1;
-    }
-
-    int usePosition(IR::Stmt *s) const
-    {
-        return _sortedIntervals->positionForStatement(s);
-    }
-
-    int start(IR::BasicBlock *bb) const
-    {
-        return _sortedIntervals->startPosition(bb);
-    }
-
-    int end(IR::BasicBlock *bb) const
-    {
-        return _sortedIntervals->endPosition(bb);
-    }
-
-public:
-    LifeRanges(IR::Function *function, const QHash<BasicBlock *, BasicBlock *> &startEndLoops)
-        : _intervals(function->tempCount)
-    {
-        _sortedIntervals = LifeTimeIntervals::create(function);
-        _liveIn.resize(function->basicBlockCount());
-
-        for (int i = function->basicBlockCount() - 1; i >= 0; --i) {
-            BasicBlock *bb = function->basicBlock(i);
-            buildIntervals(bb, startEndLoops.value(bb, 0));
-        }
-
-        _intervals.clear();
-    }
-
-    LifeTimeIntervals::Ptr intervals() const { return _sortedIntervals; }
-
-    void dump() const
-    {
-        QBuffer buf;
-        buf.open(QIODevice::WriteOnly);
-        QTextStream qout(&buf);
-
-        qout << "Life ranges:" << endl;
-        qout << "Intervals:" << endl;
-        const auto intervals = _sortedIntervals->intervals();
-        for (const LifeTimeInterval *range : intervals) {
-            range->dump(qout);
-            qout << endl;
-        }
-
-        IRPrinter printer(&qout);
-        for (size_t i = 0, ei = _liveIn.size(); i != ei; ++i) {
-            qout << "L" << i <<" live-in: ";
-            auto live = _liveIn.at(i);
-            if (live.empty())
-                qout << "(none)";
-            std::sort(live.begin(), live.end());
-            for (int i = 0; i < live.size(); ++i) {
-                if (i > 0) qout << ", ";
-                qout << '%' << live.at(i);
-            }
-            qout << endl;
-        }
-        buf.close();
-        qDebug("%s", buf.data().constData());
-    }
-
-private:
-    void buildIntervals(BasicBlock *bb, BasicBlock *loopEnd)
-    {
-        LiveRegs live;
-        for (BasicBlock *successor : bb->out) {
-            live.unite(_liveIn[successor->index()]);
-            const int bbIndex = successor->in.indexOf(bb);
-            Q_ASSERT(bbIndex >= 0);
-
-            for (Stmt *s : successor->statements()) {
-                if (Phi *phi = s->asPhi()) {
-                    if (Temp *t = phi->incoming.at(bbIndex)->asTemp()) {
-                        ensureInterval(*t);
-                        live.insert(t->index);
-                    }
-                } else {
-                    break;
-                }
-            }
-        }
-
-        const QVector<Stmt *> &statements = bb->statements();
-
-        for (int reg : live)
-            _intervals[reg]->addRange(start(bb), end(bb));
-
-        InputOutputCollector collector;
-        for (int i = statements.size() - 1; i >= 0; --i) {
-            Stmt *s = statements.at(i);
-            if (Phi *phi = s->asPhi()) {
-                ensureInterval(*phi->targetTemp);
-                LiveRegs::iterator it = live.find(phi->targetTemp->index);
-                if (it == live.end()) {
-                    // a phi node target that is only defined, but never used
-                    interval(phi->targetTemp).setFrom(start(bb));
-                } else {
-                    live.erase(it);
-                }
-                _sortedIntervals->add(&interval(phi->targetTemp));
-                continue;
-            }
-            collector.collect(s);
-            //### TODO: use DefUses from the optimizer, because it already has all this information
-            if (Temp *opd = collector.output) {
-                ensureInterval(*opd);
-                LifeTimeInterval &lti = interval(opd);
-                lti.setFrom(defPosition(s));
-                live.remove(lti.temp().index);
-                _sortedIntervals->add(&lti);
-            }
-            //### TODO: use DefUses from the optimizer, because it already has all this information
-            for (size_t i = 0, ei = collector.inputs.size(); i != ei; ++i) {
-                Temp *opd = collector.inputs[i];
-                ensureInterval(*opd);
-                interval(opd).addRange(start(bb), usePosition(s));
-                live.insert(opd->index);
-            }
-        }
-
-        if (loopEnd) { // Meaning: bb is a loop header, because loopEnd is set to non-null.
-            for (int reg : live)
-                _intervals[reg]->addRange(start(bb), usePosition(loopEnd->terminator()));
-        }
-
-        _liveIn[bb->index()] = std::move(live);
-    }
-};
-
-void removeUnreachleBlocks(IR::Function *function)
-{
-    QVector<BasicBlock *> newSchedule;
-    newSchedule.reserve(function->basicBlockCount());
-    for (BasicBlock *bb : function->basicBlocks())
-        if (!bb->isRemoved())
-            newSchedule.append(bb);
-    function->setScheduledBlocks(newSchedule);
-}
-
-class ConvertArgLocals
-{
-public:
-    ConvertArgLocals(IR::Function *function)
-        : function(function)
-        , convertArgs(!function->usesArgumentsObject)
-    {
-        tempForFormal.resize(function->formals.size(), -1);
-        tempForLocal.resize(function->locals.size(), -1);
-    }
-
-    void toTemps()
-    {
-        if (function->variablesCanEscape())
-            return;
-
-        QVector<Stmt *> extraMoves;
-        if (convertArgs) {
-            const int formalCount = function->formals.size();
-            extraMoves.reserve(formalCount + function->basicBlock(0)->statementCount());
-            extraMoves.resize(formalCount);
-
-            for (int i = 0; i != formalCount; ++i) {
-                const int newTemp = function->tempCount++;
-                tempForFormal[i] = newTemp;
-
-                ArgLocal *source = function->New<ArgLocal>();
-                source->init(ArgLocal::Formal, i, 0);
-
-                Temp *target = function->New<Temp>();
-                target->init(Temp::VirtualRegister, newTemp);
-
-                Move *m = function->NewStmt<Move>();
-                m->init(target, source);
-                extraMoves[i] = m;
-            }
-        }
-
-        for (BasicBlock *bb : function->basicBlocks()) {
-            if (!bb->isRemoved()) {
-                for (Stmt *s : bb->statements()) {
-                    visit(s);
-                }
-            }
-        }
-
-        if (convertArgs && function->formals.size() > 0)
-            function->basicBlock(0)->prependStatements(extraMoves);
-
-        function->locals.clear();
-    }
-
-private:
-    void visit(Stmt *s)
-    {
-        if (auto e = s->asExp()) {
-            check(e->expr);
-        } else if (auto m = s->asMove()) {
-            check(m->target); check(m->source);
-        } else if (auto c = s->asCJump()) {
-            check(c->cond);
-        } else if (auto r = s->asRet()) {
-            check(r->expr);
-        }
-    }
-
-    void visit(Expr *e)
-    {
-        if (auto c = e->asConvert()) {
-            check(c->expr);
-        } else if (auto u = e->asUnop()) {
-            check(u->expr);
-        } else if (auto b = e->asBinop()) {
-            check(b->left); check(b->right);
-        } else if (auto c = e->asCall()) {
-            check(c->base);
-            for (ExprList *it = c->args; it; it = it->next) {
-                check(it->expr);
-            }
-        } else if (auto n = e->asNew()) {
-            check(n->base);
-            for (ExprList *it = n->args; it; it = it->next) {
-                check(it->expr);
-            }
-        } else if (auto s = e->asSubscript()) {
-            check(s->base); check(s->index);
-        } else if (auto m = e->asMember()) {
-            check(m->base);
-        }
-    }
-
-    void check(Expr *&e) {
-        if (ArgLocal *al = e->asArgLocal()) {
-            if (al->kind == ArgLocal::Local) {
-                Temp *t = function->New<Temp>();
-                t->init(Temp::VirtualRegister, fetchTempForLocal(al->index));
-                e = t;
-            } else if (convertArgs && al->kind == ArgLocal::Formal) {
-                Temp *t = function->New<Temp>();
-                t->init(Temp::VirtualRegister, fetchTempForFormal(al->index));
-                e = t;
-            }
-        } else {
-            visit(e);
-        }
-    }
-
-    int fetchTempForLocal(int local)
-    {
-        int &ref = tempForLocal[local];
-        if (ref == -1)
-            ref = function->tempCount++;
-        return ref;
-    }
-
-    int fetchTempForFormal(int formal)
-    {
-        return tempForFormal[formal];
-    }
-
-    IR::Function *function;
-    bool convertArgs;
-    std::vector<int> tempForFormal;
-    std::vector<int> tempForLocal;
-};
-
-class CloneBasicBlock: protected CloneExpr
-{
-public:
-    BasicBlock *operator()(IR::BasicBlock *originalBlock)
-    {
-        block = new BasicBlock(originalBlock->function, 0);
-
-        for (Stmt *s : originalBlock->statements()) {
-            visit(s);
-            clonedStmt->location = s->location;
-        }
-
-        return block;
-    }
-
-private:
-    void visit(Stmt *s)
-    {
-        if (auto e = s->asExp()) {
-            clonedStmt = block->EXP(clone(e->expr));
-        } else if (auto m = s->asMove()) {
-            clonedStmt = block->MOVE(clone(m->target), clone(m->source));
-        } else if (auto j = s->asJump()) {
-            clonedStmt = block->JUMP(j->target);
-        } else if (auto c = s->asCJump()) {
-            clonedStmt = block->CJUMP(clone(c->cond), c->iftrue, c->iffalse);
-        } else if (auto r = s->asRet()) {
-            clonedStmt = block->RET(clone(r->expr));
-        } else if (auto p = s->asPhi()) {
-            Phi *phi = block->function->NewStmt<Phi>();
-            clonedStmt = phi;
-
-            phi->targetTemp = clone(p->targetTemp);
-            for (Expr *in : p->incoming)
-                phi->incoming.append(clone(in));
-            block->appendStatement(phi);
-        } else {
-            Q_UNREACHABLE();
-        }
-    }
-
-private:
-    IR::Stmt *clonedStmt;
-};
-
-static void verifyCFG(IR::Function *function)
-{
-    if (!DoVerification)
-        return;
-
-    for (BasicBlock *bb : function->basicBlocks()) {
-        if (bb->isRemoved()) {
-            Q_ASSERT(bb->in.isEmpty());
-            Q_ASSERT(bb->out.isEmpty());
-            continue;
-        }
-
-        Q_ASSERT(function->basicBlock(bb->index()) == bb);
-
-        // Check the terminators:
-        Stmt *terminator = bb->terminator();
-        if (terminator == nullptr) {
-            Stmt *last = bb->statements().last();
-            Call *call = last->asExp()->expr->asCall();
-            Name *baseName = call->base->asName();
-            Q_ASSERT(baseName->builtin == Name::builtin_rethrow);
-            Q_UNUSED(baseName);
-        } else if (Jump *jump = terminator->asJump()) {
-            Q_UNUSED(jump);
-            Q_ASSERT(jump->target);
-            Q_ASSERT(!jump->target->isRemoved());
-            Q_ASSERT(bb->out.size() == 1);
-            Q_ASSERT(bb->out.first() == jump->target);
-        } else if (CJump *cjump = terminator->asCJump()) {
-            Q_UNUSED(cjump);
-            Q_ASSERT(bb->out.size() == 2);
-            Q_ASSERT(cjump->iftrue);
-            Q_ASSERT(!cjump->iftrue->isRemoved());
-            Q_ASSERT(cjump->iftrue == bb->out[0]);
-            Q_ASSERT(cjump->iffalse);
-            Q_ASSERT(!cjump->iffalse->isRemoved());
-            Q_ASSERT(cjump->iffalse == bb->out[1]);
-        } else if (terminator->asRet()) {
-            Q_ASSERT(bb->out.size() == 0);
-        } else {
-            Q_UNREACHABLE();
-        }
-
-        // Check the outgoing edges:
-        for (BasicBlock *out : bb->out) {
-            Q_UNUSED(out);
-            Q_ASSERT(!out->isRemoved());
-            Q_ASSERT(out->in.contains(bb));
-        }
-
-        // Check the incoming edges:
-        for (BasicBlock *in : bb->in) {
-            Q_UNUSED(in);
-            Q_ASSERT(!in->isRemoved());
-            Q_ASSERT(in->out.contains(bb));
-        }
-    }
-}
-
-static void verifyImmediateDominators(const DominatorTree &dt, IR::Function *function)
-{
-    if (!DoVerification)
-        return;
-
-    cfg2dot(function);
-    dt.dumpImmediateDominators();
-    DominatorTree referenceTree(function);
-
-    for (BasicBlock *bb : function->basicBlocks()) {
-        if (bb->isRemoved())
-            continue;
-
-        BasicBlock *idom = dt.immediateDominator(bb);
-        BasicBlock *referenceIdom = referenceTree.immediateDominator(bb);
-        Q_UNUSED(idom);
-        Q_UNUSED(referenceIdom);
-        Q_ASSERT(idom == referenceIdom);
-    }
-}
-
-static void verifyNoPointerSharing(IR::Function *function)
-{
-    if (!DoVerification)
-        return;
-
-    class {
-    public:
-        void operator()(IR::Function *f)
-        {
-            for (BasicBlock *bb : f->basicBlocks()) {
-                if (bb->isRemoved())
-                    continue;
-
-                for (Stmt *s : bb->statements()) {
-                    visit(s);
-                }
-            }
-        }
-
-    private:
-        void visit(Stmt *s)
-        {
-            check(s);
-            STMT_VISIT_ALL_KINDS(s);
-        }
-
-        void visit(Expr *e)
-        {
-            check(e);
-            EXPR_VISIT_ALL_KINDS(e);
-        }
-
-    private:
-        void check(Stmt *s)
-        {
-            Q_ASSERT(!stmts.contains(s));
-            stmts.insert(s);
-        }
-
-        void check(Expr *e)
-        {
-            Q_ASSERT(!exprs.contains(e));
-            exprs.insert(e);
-        }
-
-        QSet<Stmt *> stmts;
-        QSet<Expr *> exprs;
-    } V;
-    V(function);
-}
-
-// Loop-peeling is done by unfolding the loop once. The "original" loop basic blocks stay where they
-// are, and a copy of the loop is placed after it. Special care is taken while copying the loop body:
-// by having the copies of the basic-blocks point to the same nodes as the "original" basic blocks,
-// updating the immediate dominators is easy: if the edge of a copied basic-block B points to a
-// block C that has also been copied, set the immediate dominator of B to the corresponding
-// immediate dominator of C. Finally, for any node outside the loop that gets a new edge attached,
-// the immediate dominator has to be re-calculated.
-class LoopPeeling
-{
-    DominatorTree &dt;
-
-public:
-    LoopPeeling(DominatorTree &dt)
-        : dt(dt)
-    {}
-
-    void run(const QVector<LoopDetection::LoopInfo *> &loops)
-    {
-        for (LoopDetection::LoopInfo *loopInfo : loops)
-            peelLoop(loopInfo);
-    }
-
-private:
-    // All copies have their outgoing edges pointing to the same successor block as the originals.
-    // For each copied block, check where the outgoing edges point to. If it's a block inside the
-    // (original) loop, rewire it to the corresponding copy. Otherwise, which is when it points
-    // out of the loop, leave it alone.
-    // As an extra, collect all edges that point out of the copied loop, because the targets need
-    // to have their immediate dominator rechecked.
-    void rewire(BasicBlock *newLoopBlock, const QVector<BasicBlock *> &from, const QVector<BasicBlock *> &to, QVector<BasicBlock *> &loopExits)
-    {
-        for (int i = 0, ei = newLoopBlock->out.size(); i != ei; ++i) {
-            BasicBlock *&out = newLoopBlock->out[i];
-            const int idx = from.indexOf(out);
-            if (idx == -1) {
-                if (!loopExits.contains(out))
-                    loopExits.append(out);
-            } else {
-                out->in.removeOne(newLoopBlock);
-                BasicBlock *newTo = to.at(idx);
-                newTo->in.append(newLoopBlock);
-                out = newTo;
-
-                Stmt *terminator = newLoopBlock->terminator();
-                if (Jump *jump = terminator->asJump()) {
-                    Q_ASSERT(i == 0);
-                    jump->target = newTo;
-                } else if (CJump *cjump = terminator->asCJump()) {
-                    Q_ASSERT(i == 0 || i == 1);
-                    if (i == 0)
-                        cjump->iftrue = newTo;
-                    else
-                        cjump->iffalse = newTo;
-                }
-            }
-        }
-    }
-
-    void peelLoop(LoopDetection::LoopInfo *loop)
-    {
-        IR::Function *f = loop->loopHeader->function;
-        CloneBasicBlock clone;
-
-        LoopDetection::LoopInfo unpeeled(*loop);
-        unpeeled.loopHeader = clone(unpeeled.loopHeader);
-        unpeeled.loopHeader->setContainingGroup(loop->loopHeader->containingGroup());
-        unpeeled.loopHeader->markAsGroupStart(true);
-        f->addBasicBlock(unpeeled.loopHeader);
-        for (int i = 0, ei = unpeeled.loopBody.size(); i != ei; ++i) {
-            BasicBlock *&bodyBlock = unpeeled.loopBody[i];
-            bodyBlock = clone(bodyBlock);
-            bodyBlock->setContainingGroup(unpeeled.loopHeader);
-            Q_ASSERT(bodyBlock->statementCount() == loop->loopBody[i]->statementCount());
-        }
-
-        // The cloned blocks will have no incoming edges, but they do have outgoing ones (copying
-        // the terminators will automatically insert that edge). The blocks where the originals
-        // pointed to will have an extra incoming edge from the copied blocks.
-
-        BasicBlock::IncomingEdges inCopy = loop->loopHeader->in;
-        for (BasicBlock *in : inCopy) {
-            if (loop->loopHeader != in // this can happen for really tight loops (where there are no body blocks). This is a back-edge in that case.
-                    && unpeeled.loopHeader != in && !unpeeled.loopBody.contains(in) // if the edge is not coming from within the copied set, leave it alone
-                    && !dt.dominates(loop->loopHeader, in)) // an edge coming from within the loop (so a back-edge): this is handled when rewiring all outgoing edges
-                continue;
-
-            unpeeled.loopHeader->in.append(in);
-            loop->loopHeader->in.removeOne(in);
-
-            Stmt *terminator = in->terminator();
-            if (Jump *jump = terminator->asJump()) {
-                jump->target = unpeeled.loopHeader;
-                in->out[0] = unpeeled.loopHeader;
-            } else if (CJump *cjump = terminator->asCJump()) {
-                if (cjump->iftrue == loop->loopHeader) {
-                    cjump->iftrue = unpeeled.loopHeader;
-                    Q_ASSERT(in->out[0] == loop->loopHeader);
-                    in->out[0] = unpeeled.loopHeader;
-                } else if (cjump->iffalse == loop->loopHeader) {
-                    cjump->iffalse = unpeeled.loopHeader;
-                    Q_ASSERT(in->out[1] == loop->loopHeader);
-                    in->out[1] = unpeeled.loopHeader;
-                } else {
-                    Q_UNREACHABLE();
-                }
-            }
-        }
-
-        QVector<BasicBlock *> loopExits;
-        loopExits.reserve(8);
-        loopExits.append(unpeeled.loopHeader);
-
-        rewire(unpeeled.loopHeader, loop->loopBody, unpeeled.loopBody, loopExits);
-        for (int i = 0, ei = unpeeled.loopBody.size(); i != ei; ++i) {
-            BasicBlock *bodyBlock = unpeeled.loopBody.at(i);
-            rewire(bodyBlock, loop->loopBody, unpeeled.loopBody, loopExits);
-            f->addBasicBlock(bodyBlock);
-        }
-
-        // The original loop is now peeled off, and won't jump back to the loop header. Meaning, it
-        // is not a loop anymore, so unmark it.
-        loop->loopHeader->markAsGroupStart(false);
-        for (BasicBlock *bb : qAsConst(loop->loopBody))
-            bb->setContainingGroup(loop->loopHeader->containingGroup());
-
-        // Set the immediate dominator of the new loop header to the old one. The real immediate
-        // dominator will be calculated later.
-        dt.setImmediateDominator(unpeeled.loopHeader, loop->loopHeader);
-        // calculate the idoms in a separate loop, because addBasicBlock in the previous loop will
-        // set the block index, which in turn is used by the dominator tree.
-        for (int i = 0, ei = unpeeled.loopBody.size(); i != ei; ++i) {
-            BasicBlock *bodyBlock = unpeeled.loopBody.at(i);
-            BasicBlock *idom = dt.immediateDominator(loop->loopBody.at(i));
-            const int idx = loop->loopBody.indexOf(idom);
-            if (idom == loop->loopHeader)
-                idom = unpeeled.loopHeader;
-            else if (idx != -1)
-                idom = unpeeled.loopBody.at(idx);
-            Q_ASSERT(idom);
-            dt.setImmediateDominator(bodyBlock, idom);
-        }
-
-        BasicBlockSet siblings(f);
-        for (BasicBlock *bb : qAsConst(loopExits))
-            dt.collectSiblings(bb, siblings);
-
-        siblings.insert(unpeeled.loopHeader);
-        dt.recalculateIDoms(siblings, loop->loopHeader);
-        dt.dumpImmediateDominators();
-        verifyImmediateDominators(dt, f);
-    }
-};
-
-class RemoveLineNumbers: private SideEffectsChecker
-{
-public:
-    static void run(IR::Function *function)
-    {
-        for (BasicBlock *bb : function->basicBlocks()) {
-            if (bb->isRemoved())
-                continue;
-
-            for (Stmt *s : bb->statements()) {
-                if (!hasSideEffects(s)) {
-                    s->location = QQmlJS::AST::SourceLocation();
-                }
-            }
-        }
-    }
-
-private:
-    ~RemoveLineNumbers() {}
-
-    static bool hasSideEffects(Stmt *stmt)
-    {
-        RemoveLineNumbers checker;
-        if (auto e = stmt->asExp()) {
-            checker.visit(e->expr);
-        } else if (auto m = stmt->asMove()) {
-            checker.visit(m->source);
-            if (!checker.seenSideEffects()) {
-                checker.visit(m->target);
-            }
-        } else if (auto c = stmt->asCJump()) {
-            checker.visit(c->cond);
-        } else if (auto r = stmt->asRet()) {
-            checker.visit(r->expr);
-        }
-        return checker.seenSideEffects();
-    }
-
-    void visitTemp(Temp *) override final {}
-};
-
-void mergeBasicBlocks(IR::Function *function, DefUses *du, DominatorTree *dt)
-{
-    enum { DebugBlockMerging = 0 };
-
-    if (function->hasTry)
-        return;
-
-    showMeTheCode(function, "Before basic block merging");
-
-    // Now merge a basic block with its successor when there is one outgoing edge, and the
-    // successor has one incoming edge.
-    for (int i = 0, ei = function->basicBlockCount(); i != ei; ++i) {
-        BasicBlock *bb = function->basicBlock(i);
-
-        bb->nextLocation = QQmlJS::AST::SourceLocation(); // make sure appendStatement doesn't mess with the line info
-
-        if (bb->isRemoved()) continue; // the block has been removed, so ignore it
-        if (bb->out.size() != 1) continue; // more than one outgoing edge
-        BasicBlock *successor = bb->out.first();
-        if (successor->in.size() != 1) continue; // more than one incoming edge
-
-        // Loop header? No efficient way to update the other blocks that refer to this as containing group,
-        // so don't do merging yet.
-        if (successor->isGroupStart()) continue;
-
-        // Ok, we can merge the two basic blocks.
-        if (DebugBlockMerging) {
-            qDebug("Merging L%d into L%d", successor->index(), bb->index());
-        }
-        Q_ASSERT(bb->terminator()->asJump());
-        bb->removeStatement(bb->statementCount() - 1); // remove the terminator, and replace it with:
-        for (Stmt *s : successor->statements()) {
-            bb->appendStatement(s); // add all statements from the successor to the current basic block
-            if (auto cjump = s->asCJump())
-                cjump->parent = bb;
-        }
-        bb->out = successor->out; // set the outgoing edges to the successor's so they're now in sync with our new terminator
-        for (auto newSuccessor : bb->out) {
-            for (auto &backlink : newSuccessor->in) {
-                if (backlink == successor) {
-                    backlink = bb; // for all successors of our successor: set the incoming edges to come from bb, because we'll now jump there.
-                }
-            }
-        }
-        if (du) {
-            // all statements in successor have moved to bb, so make sure that the containing blocks
-            // stored in DefUses get updated (meaning: point to bb)
-            du->replaceBasicBlock(successor, bb);
-        }
-        if (dt) {
-            // update the immediate dominators to: any block that was dominated by the successor
-            // will now need to point to bb's immediate dominator. The reason is that bb itself
-            // won't be anyones immediate dominator, because it had just one outgoing edge.
-            dt->mergeIntoPredecessor(successor);
-        }
-        function->removeBasicBlock(successor);
-        --i; // re-run on the current basic-block, so any chain gets collapsed.
-    }
-
-    showMeTheCode(function, "After basic block merging");
-    verifyCFG(function);
-}
-
-} // anonymous namespace
-
-void LifeTimeInterval::setFrom(int from) {
-    Q_ASSERT(from > 0);
-
-    if (_ranges.isEmpty()) { // this is the case where there is no use, only a define
-        _ranges.prepend(LifeTimeIntervalRange(from, from));
-        if (_end == InvalidPosition)
-            _end = from;
-    } else {
-        _ranges.first().start = from;
-    }
-}
-
-void LifeTimeInterval::addRange(int from, int to) {
-    Q_ASSERT(from > 0);
-    Q_ASSERT(to > 0);
-    Q_ASSERT(to >= from);
-
-    if (_ranges.isEmpty()) {
-        _ranges.prepend(LifeTimeIntervalRange(from, to));
-        _end = to;
-        return;
-    }
-
-    LifeTimeIntervalRange *p = &_ranges.first();
-    if (to + 1 >= p->start && p->end + 1 >= from) {
-        p->start = qMin(p->start, from);
-        p->end = qMax(p->end, to);
-        while (_ranges.count() > 1) {
-            LifeTimeIntervalRange *p1 = p + 1;
-            if (p->end + 1 < p1->start || p1->end + 1 < p->start)
-                break;
-            p1->start = qMin(p->start, p1->start);
-            p1->end = qMax(p->end, p1->end);
-            _ranges.remove(0);
-            p = &_ranges.first();
-        }
-    } else {
-        if (to < p->start) {
-            _ranges.prepend(LifeTimeIntervalRange(from, to));
-        } else {
-            Q_ASSERT(from > _ranges.last().end);
-            _ranges.push_back(LifeTimeIntervalRange(from, to));
-        }
-    }
-
-    _end = _ranges.last().end;
-}
-
-LifeTimeInterval LifeTimeInterval::split(int atPosition, int newStart)
-{
-    Q_ASSERT(atPosition < newStart || newStart == InvalidPosition);
-    Q_ASSERT(atPosition <= _end);
-    Q_ASSERT(newStart <= _end || newStart == InvalidPosition);
-
-    if (_ranges.isEmpty() || atPosition < _ranges.first().start)
-        return LifeTimeInterval();
-
-    LifeTimeInterval newInterval = *this;
-    newInterval.setSplitFromInterval(true);
-
-    // search where to split the interval
-    for (int i = 0, ei = _ranges.size(); i < ei; ++i) {
-        if (_ranges.at(i).start <= atPosition) {
-            if (_ranges.at(i).end >= atPosition) {
-                // split happens in the middle of a range. Keep this range in both the old and the
-                // new interval, and correct the end/start later
-                _ranges.resize(i + 1);
-                newInterval._ranges.remove(0, i);
-                break;
-            }
-        } else {
-            // split happens between two ranges.
-            _ranges.resize(i);
-            newInterval._ranges.remove(0, i);
-            break;
-        }
-    }
-
-    if (newInterval._ranges.first().end == atPosition)
-        newInterval._ranges.remove(0);
-
-    if (newStart == InvalidPosition) {
-        // the temp stays inactive for the rest of its lifetime
-        newInterval = LifeTimeInterval();
-    } else {
-        // find the first range where the temp will get active again:
-        while (!newInterval._ranges.isEmpty()) {
-            const LifeTimeIntervalRange &range = newInterval._ranges.first();
-            if (range.start > newStart) {
-                // The split position is before the start of the range. Either we managed to skip
-                // over the correct range, or we got an invalid split request. Either way, this
-                // Should Never Happen <TM>.
-                Q_ASSERT(range.start > newStart);
-                return LifeTimeInterval();
-            } else if (range.start <= newStart && range.end >= newStart) {
-                // yay, we found the range that should be the new first range in the new interval!
-                break;
-            } else {
-                // the temp stays inactive for this interval, so remove it.
-                newInterval._ranges.remove(0);
-            }
-        }
-        Q_ASSERT(!newInterval._ranges.isEmpty());
-        newInterval._ranges.first().start = newStart;
-        _end = newStart;
-    }
-
-    // if we're in the middle of a range, set the end to the split position
-    if (_ranges.last().end > atPosition)
-        _ranges.last().end = atPosition;
-
-    validate();
-    newInterval.validate();
-
-    return newInterval;
-}
-
-void LifeTimeInterval::dump(QTextStream &out) const {
-    IRPrinter(&out).print(const_cast<Temp *>(&_temp));
-    out << ": ends at " << _end << " with ranges ";
-    if (_ranges.isEmpty())
-        out << "(none)";
-    for (int i = 0; i < _ranges.size(); ++i) {
-        if (i > 0) out << ", ";
-        out << _ranges[i].start << " - " << _ranges[i].end;
-    }
-    if (_reg != InvalidRegister)
-        out << " (register " << _reg << ")";
-}
-
-
-bool LifeTimeInterval::lessThanForTemp(const LifeTimeInterval *r1, const LifeTimeInterval *r2)
-{
-    return r1->temp() < r2->temp();
-}
-
-LifeTimeIntervals::LifeTimeIntervals(IR::Function *function)
-    : _basicBlockPosition(function->basicBlockCount())
-    , _positionForStatement(function->statementCount(), IR::Stmt::InvalidId)
-    , _lastPosition(0)
-{
-    _intervals.reserve(function->tempCount + 32); // we reserve a bit more space for intervals, because the register allocator will add intervals with fixed ranges for each register.
-    renumber(function);
-}
-
-// Renumbering works as follows:
-//  - phi statements are not numbered
-//  - statement numbers start at 0 (zero) and increment get an even number (lastPosition + 2)
-//  - basic blocks start at firstStatementNumber - 1, or rephrased: lastPosition + 1
-//  - basic blocks end at the number of the last statement
-// And during life-time calculation the next rule is used:
-//  - any temporary starts its life-time at definingStatementPosition + 1
-//
-// This numbering simulates half-open intervals. For example:
-//   0: %1 = 1
-//   2: %2 = 2
-//   4: %3 = %1 + %2
-//   6: print(%3)
-// Here the half-open life-time intervals would be:
-//   %1: (0-4]
-//   %2: (2-4]
-//   %3: (4-6]
-// Instead, we use the even statement positions for uses of temporaries, and the odd positions for
-// their definitions:
-//   %1: [1-4]
-//   %2: [3-4]
-//   %3: [5-6]
-// This has the nice advantage that placing %3 (for example) is really easy: the start will
-// never overlap with the end of the uses of the operands used in the defining statement.
-//
-// The reason to start a basic-block at firstStatementPosition - 1 is to have correct start
-// positions for target temporaries of phi-nodes. Those temporaries will now start before the
-// first statement. This also means that any moves that get generated when transforming out of SSA
-// form, will not interfere with (read: overlap) any defining statements in the preceding
-// basic-block.
-void LifeTimeIntervals::renumber(IR::Function *function)
-{
-    for (BasicBlock *bb : function->basicBlocks()) {
-        if (bb->isRemoved())
-            continue;
-
-        _basicBlockPosition[bb->index()].start = _lastPosition + 1;
-
-        for (Stmt *s : bb->statements()) {
-            if (s->asPhi())
-                continue;
-
-            _lastPosition += 2;
-            _positionForStatement[s->id()] = _lastPosition;
-        }
-
-        _basicBlockPosition[bb->index()].end = _lastPosition;
-    }
-}
-
-LifeTimeIntervals::~LifeTimeIntervals()
-{
-    qDeleteAll(_intervals);
-}
-
-Optimizer::Optimizer(IR::Function *function)
-    : function(function)
-    , inSSA(false)
-{}
-
-void Optimizer::run(QQmlEnginePrivate *qmlEngine, bool doTypeInference, bool peelLoops)
-{
-    showMeTheCode(function, "Before running the optimizer");
-
-    cleanupBasicBlocks(function);
-
-    function->removeSharedExpressions();
-    int statementCount = 0;
-    for (BasicBlock *bb : function->basicBlocks())
-        if (!bb->isRemoved())
-            statementCount += bb->statementCount();
-//    showMeTheCode(function);
-
-    static bool doSSA = qEnvironmentVariableIsEmpty("QV4_NO_SSA");
-
-    if (!function->hasTry && !function->hasWith && !function->module->debugMode && doSSA && statementCount <= 300) {
-//        qout << "SSA for " << (function->name ? qPrintable(*function->name) : "<anonymous>") << endl;
-
-        mergeBasicBlocks(function, nullptr, nullptr);
-
-        ConvertArgLocals(function).toTemps();
-        showMeTheCode(function, "After converting arguments to locals");
-
-        // Calculate the dominator tree:
-        DominatorTree df(function);
-
-        {
-            // This is in a separate scope, because loop-peeling doesn't (yet) update the LoopInfo
-            // calculated by the LoopDetection. So by putting it in a separate scope, it is not
-            // available after peeling.
-
-            LoopDetection loopDetection(df);
-            loopDetection.run(function);
-            showMeTheCode(function, "After loop detection");
-//            cfg2dot(function, loopDetection.allLoops());
-
-            // ### disable loop peeling for now. It doesn't give any measurable performance
-            // improvements at this time, but significantly increases the size of the
-            // JIT generated code
-            Q_UNUSED(peelLoops);
-            if (0 && peelLoops) {
-                QVector<LoopDetection::LoopInfo *> innerLoops = loopDetection.innermostLoops();
-                LoopPeeling(df).run(innerLoops);
-
-//                cfg2dot(function, loopDetection.allLoops());
-                showMeTheCode(function, "After loop peeling");
-                if (!innerLoops.isEmpty())
-                    verifyImmediateDominators(df, function);
-            }
-        }
-
-        verifyCFG(function);
-        verifyNoPointerSharing(function);
-
-        df.computeDF();
-
-        verifyCFG(function);
-        verifyImmediateDominators(df, function);
-
-        DefUses defUses(function);
-
-//        qout << "Converting to SSA..." << endl;
-        convertToSSA(function, df, defUses);
-//        showMeTheCode(function);
-//        defUses.dump();
-
-//        qout << "Cleaning up phi nodes..." << endl;
-        cleanupPhis(defUses);
-        showMeTheCode(function, "After cleaning up phi-nodes");
-
-        StatementWorklist worklist(function);
-
-        if (doTypeInference) {
-//            qout << "Running type inference..." << endl;
-            TypeInference(qmlEngine, defUses).run(worklist);
-            showMeTheCode(function, "After type inference");
-
-//            qout << "Doing reverse inference..." << endl;
-            ReverseInference(defUses).run(function);
-//            showMeTheCode(function);
-
-//            qout << "Doing type propagation..." << endl;
-            TypePropagation(defUses).run(function, worklist);
-//            showMeTheCode(function);
-            verifyNoPointerSharing(function);
-        }
-
-        static const bool doOpt = qEnvironmentVariableIsEmpty("QV4_NO_OPT");
-        if (doOpt) {
-//            qout << "Running SSA optimization..." << endl;
-            worklist.reset();
-            optimizeSSA(worklist, defUses, df);
-            showMeTheCode(function, "After optimization");
-
-            verifyImmediateDominators(df, function);
-            verifyCFG(function);
-        }
-
-        verifyNoPointerSharing(function);
-        mergeBasicBlocks(function, &defUses, &df);
-
-        verifyImmediateDominators(df, function);
-        verifyCFG(function);
-
-        // Basic-block cycles that are unreachable (i.e. for loops in a then-part where the
-        // condition is calculated to be always false) are not yet removed. This will choke the
-        // block scheduling, so remove those now.
-//        qout << "Cleaning up unreachable basic blocks..." << endl;
-        cleanupBasicBlocks(function);
-//        showMeTheCode(function);
-
-        verifyImmediateDominators(df, function);
-        verifyCFG(function);
-
-        // Transform the CFG into edge-split SSA.
-        showMeTheCode(function, "Before edge splitting");
-        splitCriticalEdges(function, df, worklist, defUses);
-        showMeTheCode(function, "After edge splitting");
-
-        verifyImmediateDominators(df, function);
-        verifyCFG(function);
-
-//        qout << "Doing block scheduling..." << endl;
-//        df.dumpImmediateDominators();
-        startEndLoops = BlockScheduler(function, df).go();
-        showMeTheCode(function, "After basic block scheduling");
-//        cfg2dot(function);
-
-#ifndef QT_NO_DEBUG
-        checkCriticalEdges(function->basicBlocks());
-#endif
-
-        if (!function->module->debugMode) {
-            RemoveLineNumbers::run(function);
-            showMeTheCode(function, "After line number removal");
-        }
-
-//        qout << "Finished SSA." << endl;
-        inSSA = true;
-    } else {
-        removeUnreachleBlocks(function);
-        inSSA = false;
-    }
-}
-
-void Optimizer::convertOutOfSSA() {
-    if (!inSSA)
-        return;
-
-    // There should be no critical edges at this point.
-
-    for (BasicBlock *bb : function->basicBlocks()) {
-        MoveMapping moves;
-
-        for (BasicBlock *successor : bb->out) {
-            const int inIdx = successor->in.indexOf(bb);
-            Q_ASSERT(inIdx >= 0);
-            for (Stmt *s : successor->statements()) {
-                if (Phi *phi = s->asPhi()) {
-                    moves.add(clone(phi->incoming[inIdx], function),
-                              clone(phi->targetTemp, function)->asTemp());
-                } else {
-                    break;
-                }
-            }
-        }
-
-        if (DebugMoveMapping) {
-            QBuffer buf;
-            buf.open(QIODevice::WriteOnly);
-            QTextStream os(&buf);
-            os << "Move mapping for function ";
-            if (function->name)
-                os << *function->name;
-            else
-                os << (void *) function;
-            os << " on basic-block L" << bb->index() << ":" << endl;
-            moves.dump();
-            buf.close();
-            qDebug("%s", buf.data().constData());
-        }
-
-        moves.order();
-
-        moves.insertMoves(bb, function, true);
-    }
-
-    for (BasicBlock *bb : function->basicBlocks()) {
-        while (!bb->isEmpty()) {
-            if (bb->statements().first()->asPhi()) {
-                bb->removeStatement(0);
-            } else {
-                break;
-            }
-        }
-    }
-}
-
-LifeTimeIntervals::Ptr Optimizer::lifeTimeIntervals() const
-{
-    Q_ASSERT(isInSSA());
-
-    LifeRanges lifeRanges(function, startEndLoops);
-//    lifeRanges.dump();
-//    showMeTheCode(function);
-    return lifeRanges.intervals();
-}
-
-static int countPhis(BasicBlock *bb)
-{
-    int count = 0;
-    for (Stmt *s : bb->statements()) {
-        if (s->isa<Phi>())
-            ++count;
-        else
-            break;
-    }
-
-    return count;
-}
-
-// Basic blocks can have only 1 terminator. This function returns a bit vector, where a 1 on a
-// certain index indicates that the terminator (jump) at the end of the basic block with that index
-// can be omitted.
-BitVector Optimizer::calculateOptionalJumps()
-{
-    const int maxSize = function->basicBlockCount();
-    BitVector optional(maxSize, false);
-    if (maxSize < 2)
-        return optional;
-
-    BitVector reachableWithoutJump(maxSize, false);
-
-    for (int i = maxSize - 1; i >= 0; --i) {
-        BasicBlock *bb = function->basicBlock(i);
-        if (bb->isRemoved())
-            continue;
-
-        if (Jump *jump = bb->statements().last()->asJump()) {
-            if (reachableWithoutJump.at(jump->target->index())) {
-                if (bb->statements().size() - countPhis(bb)> 1)
-                    reachableWithoutJump.clear();
-                optional.setBit(bb->index());
-                reachableWithoutJump.setBit(bb->index());
-                continue;
-            }
-        }
-
-        reachableWithoutJump.clear();
-        reachableWithoutJump.setBit(bb->index());
-    }
-
-    return optional;
-}
-
-void Optimizer::showMeTheCode(IR::Function *function, const char *marker)
-{
-    ::showMeTheCode(function, marker);
-}
-
-static inline bool overlappingStorage(const Temp &t1, const Temp &t2)
-{
-    // This is the same as the operator==, but for one detail: memory locations are not sensitive
-    // to types, and neither are general-purpose registers.
-
-    if (t1.index != t2.index)
-        return false; // different position, where-ever that may (physically) be.
-    if (t1.kind != t2.kind)
-        return false; // formal/local/(physical-)register/stack do never overlap
-    if (t1.kind != Temp::PhysicalRegister) // Other than registers, ...
-        return t1.kind == t2.kind; // ... everything else overlaps: any memory location can hold everything.
-
-    // So now the index is the same, and we know that both stored in a register. If both are
-    // floating-point registers, they are the same. Or, if both are non-floating-point registers,
-    // generally called general-purpose registers, they are also the same.
-    return (t1.type == DoubleType && t2.type == DoubleType)
-            || (t1.type != DoubleType && t2.type != DoubleType);
-}
-
-MoveMapping::Moves MoveMapping::sourceUsages(Expr *e, const Moves &moves)
-{
-    Moves usages;
-
-    if (Temp *t = e->asTemp()) {
-        for (int i = 0, ei = moves.size(); i != ei; ++i) {
-            const Move &move = moves[i];
-            if (Temp *from = move.from->asTemp())
-                if (overlappingStorage(*from, *t))
-                    usages.append(move);
-        }
-    }
-
-    return usages;
-}
-
-void MoveMapping::add(Expr *from, Temp *to) {
-    if (Temp *t = from->asTemp()) {
-        if (overlappingStorage(*t, *to)) {
-            // assignments like fp1 = fp1 or var{&1} = double{&1} can safely be skipped.
-            if (DebugMoveMapping) {
-                QBuffer buf;
-                buf.open(QIODevice::WriteOnly);
-                QTextStream os(&buf);
-                IRPrinter printer(&os);
-                os << "Skipping ";
-                printer.print(to);
-                os << " <- ";
-                printer.print(from);
-                buf.close();
-                qDebug("%s", buf.data().constData());
-            }
-            return;
-        }
-    }
-
-    Move m(from, to);
-    if (_moves.contains(m))
-        return;
-    _moves.append(m);
-}
-
-// Order the moves that are generated when resolving edges during register allocation (see [Wimmer1]
-// section 6 for details). Now these moves form one or more graphs, so we have to output them in
-// such an order that values don't get overwritten:
-//   r1 <- r0
-//   r2 <- r1
-// That input has to be ordered as follows in order to prevent the value in r1 from being lost:
-//   r2 <- r1
-//   r1 <- r0
-//
-// So, the algorithm is to output the leaves first, and take them out of the input. This will result
-// in some moves to become leaves (in the above example: when leaf r2 <- r1 is generated and taken
-// away, the r1 <- r0 is now a leaf), so we can output those and take those out, and repeat until
-// there are no more leafs.
-//
-// The tricky part is that there might be cycles:
-//   r4 <- r5
-//   r5 <- r4
-// These have to be turned into a "register swap":
-//   r4 <=> r5
-//
-// So after running the above algorithm where we progressively remove the leaves, we are left with
-// zero or more cycles. To resolve those, we break one of the edges of the cycle, and for all other
-// edges we generate swaps. Note that the swaps will always occur as the last couple of moves,
-// because otherwise they might clobber sources for moves:
-//   r4 <=> r5
-//   r6 <- r5
-// Here, the value of r5 is already overwritten with the one in r4, so the correct order is:
-//   r6 <- r5
-//   r4 <=> r5
-void MoveMapping::order()
-{
-    QList<Move> output;
-    output.reserve(_moves.size());
-
-    while (!_moves.isEmpty()) {
-        // Take out all leaf edges, because we can output them without any problems.
-        int nextLeaf = findLeaf();
-        if (nextLeaf == -1)
-            break; // No more leafs left, we're done here.
-        output.append(_moves.takeAt(nextLeaf));
-        // Now there might be new leaf edges: any move that had the input of the previously found
-        // leaf as an output, so loop around.
-    }
-
-    while (!_moves.isEmpty()) {
-        // We're now left with one or more cycles.
-        // Step one: break the/a cycle.
-        _moves.removeFirst();
-        // Step two: find the other edges of the cycle, starting with the one of that is now a leaf.
-        while (!_moves.isEmpty()) {
-            int nextLeaf = findLeaf();
-            if (nextLeaf == -1)
-                break; // We're done with this cycle.
-            Move m = _moves.takeAt(nextLeaf);
-            // Step three: get the edges from the cycle and turn it into a swap
-            m.needsSwap = true;
-            output.append(m);
-            // Because we took out a leaf, find the next one.
-        }
-        // We're done with the cycle, let's see if there are more.
-    }
-
-    _moves = output;
-}
-
-int MoveMapping::findLeaf() const
-{
-    for (int i = 0, e = _moves.size(); i != e; ++i) {
-        // Take an edge from the list...
-        const Temp *target = _moves.at(i).to;
-        // ... and see if its target is used as a source...
-        bool targetUsedAsSource = false;
-        for (int j = 0; j != e; ++j) {
-            if (i == j)
-                continue;
-
-            Expr *source = _moves.at(j).from;
-            if (const Temp *sourceTemp = source->asTemp()) {
-                if (overlappingStorage(*target, *sourceTemp)) {
-                    targetUsedAsSource = true;
-                    break;
-                }
-            }
-        }
-        // ... if not, we have a leaf edge ...
-        if (!targetUsedAsSource)
-            return i;
-        // .. otherwise we try the next one.
-    }
-
-    return -1; // No leaf found
-}
-
-QList<IR::Move *> MoveMapping::insertMoves(BasicBlock *bb, IR::Function *function, bool atEnd) const
-{
-    QList<IR::Move *> newMoves;
-    newMoves.reserve(_moves.size());
-
-    int insertionPoint = atEnd ? bb->statements().size() - 1 : 0;
-    for (const Move &m : _moves) {
-        IR::Move *move = function->NewStmt<IR::Move>();
-        move->init(clone(m.to, function), clone(m.from, function));
-        move->swap = m.needsSwap;
-        bb->insertStatementBefore(insertionPoint++, move);
-        newMoves.append(move);
-    }
-
-    return newMoves;
-}
-
-void MoveMapping::dump() const
-{
-    if (DebugMoveMapping) {
-        QBuffer buf;
-        buf.open(QIODevice::WriteOnly);
-        QTextStream os(&buf);
-        IRPrinter printer(&os);
-        os << "Move mapping has " << _moves.size() << " moves..." << endl;
-        for (const Move &m : _moves) {
-            os << "\t";
-            printer.print(m.to);
-            if (m.needsSwap)
-                os << " <-> ";
-            else
-                os << " <-- ";
-            printer.print(m.from);
-            os << endl;
-        }
-        qDebug("%s", buf.data().constData());
-    }
-}
-
-// References:
-//  [Wimmer1] C. Wimmer and M. Franz. Linear Scan Register Allocation on SSA Form. In Proceedings of
-//            CGO'10, ACM Press, 2010
-//  [Wimmer2] C. Wimmer and H. Mossenbock. Optimized Interval Splitting in a Linear Scan Register
-//            Allocator. In Proceedings of the ACM/USENIX International Conference on Virtual
-//            Execution Environments, pages 132-141. ACM Press, 2005.
-//  [Briggs]  P. Briggs, K.D. Cooper, T.J. Harvey, and L.T. Simpson. Practical Improvements to the
-//            Construction and Destruction of Static Single Assignment Form.
-//  [Appel]   A.W. Appel. Modern Compiler Implementation in Java. Second edition, Cambridge
-//            University Press.
-//  [Ramalingam] G. Ramalingam and T. Reps. An Incremental Algorithm for Maintaining the Dominator
-//               Tree of a Reducible Flowgraph.
diff --git a/src/qml/compiler/qv4ssa_p.h b/src/qml/compiler/qv4ssa_p.h
deleted file mode 100644
index b9d8ae0a6c..0000000000
--- a/src/qml/compiler/qv4ssa_p.h
+++ /dev/null
@@ -1,472 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QV4SSA_P_H
-#define QV4SSA_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include "qv4jsir_p.h"
-#include "qv4isel_util_p.h"
-#include <private/qv4util_p.h>
-#include <QtCore/QSharedPointer>
-
-QT_BEGIN_NAMESPACE
-class QTextStream;
-class QQmlEnginePrivate;
-
-namespace QV4 {
-namespace IR {
-
-struct LifeTimeIntervalRange {
-    int start;
-    int end;
-
-    LifeTimeIntervalRange(int start = -1, int end = -1)
-        : start(start)
-        , end(end)
-    {}
-
-    bool covers(int position) const { return start <= position && position <= end; }
-};
-} // IR namespace
-} // QV4 namespace
-
-Q_DECLARE_TYPEINFO(QV4::IR::LifeTimeIntervalRange, Q_PRIMITIVE_TYPE);
-
-namespace QV4 {
-namespace IR {
-
-class Q_AUTOTEST_EXPORT LifeTimeInterval {
-public:
-    typedef QVarLengthArray<LifeTimeIntervalRange, 4> Ranges;
-
-private:
-    Temp _temp;
-    Ranges _ranges;
-    int _end;
-    int _reg;
-    unsigned _isFixedInterval : 1;
-    unsigned _isSplitFromInterval : 1;
-
-public:
-    enum { InvalidPosition = -1 };
-    enum { InvalidRegister = -1 };
-
-    explicit LifeTimeInterval(int rangeCapacity = 4)
-        : _end(InvalidPosition)
-        , _reg(InvalidRegister)
-        , _isFixedInterval(0)
-        , _isSplitFromInterval(0)
-    { _ranges.reserve(rangeCapacity); }
-
-    bool isValid() const { return _end != InvalidRegister; }
-
-    void setTemp(const Temp &temp) { this->_temp = temp; }
-    Temp temp() const { return _temp; }
-    bool isFP() const { return _temp.type == IR::DoubleType; }
-
-    void setFrom(int from);
-    void addRange(int from, int to);
-    const Ranges &ranges() const { return _ranges; }
-
-    int start() const { return _ranges.first().start; }
-    int end() const { return _end; }
-    bool covers(int position) const
-    {
-        for (int i = 0, ei = _ranges.size(); i != ei; ++i) {
-            if (_ranges.at(i).covers(position))
-                return true;
-        }
-        return false;
-    }
-
-    int reg() const { return _reg; }
-    void setReg(int reg) { Q_ASSERT(!_isFixedInterval); _reg = reg; }
-
-    bool isFixedInterval() const { return _isFixedInterval; }
-    void setFixedInterval(bool isFixedInterval) { _isFixedInterval = isFixedInterval; }
-
-    LifeTimeInterval split(int atPosition, int newStart);
-    bool isSplitFromInterval() const { return _isSplitFromInterval; }
-    void setSplitFromInterval(bool isSplitFromInterval) { _isSplitFromInterval = isSplitFromInterval; }
-
-    void dump(QTextStream &out) const;
-    static bool lessThan(const LifeTimeInterval *r1, const LifeTimeInterval *r2);
-    static bool lessThanForTemp(const LifeTimeInterval *r1, const LifeTimeInterval *r2);
-
-    void validate() const {
-#if !defined(QT_NO_DEBUG)
-        // Validate the new range
-        if (_end != InvalidPosition) {
-            Q_ASSERT(!_ranges.isEmpty());
-            for (const LifeTimeIntervalRange &range : qAsConst(_ranges)) {
-                Q_ASSERT(range.start >= 0);
-                Q_ASSERT(range.end >= 0);
-                Q_ASSERT(range.start <= range.end);
-            }
-        }
-#endif
-    }
-};
-
-inline bool LifeTimeInterval::lessThan(const LifeTimeInterval *r1, const LifeTimeInterval *r2)
-{
-    if (r1->_ranges.first().start == r2->_ranges.first().start) {
-        if (r1->isSplitFromInterval() == r2->isSplitFromInterval())
-            return r1->_ranges.last().end < r2->_ranges.last().end;
-        else
-            return r1->isSplitFromInterval();
-    } else
-        return r1->_ranges.first().start < r2->_ranges.first().start;
-}
-
-class LifeTimeIntervals
-{
-    Q_DISABLE_COPY(LifeTimeIntervals)
-
-    LifeTimeIntervals(IR::Function *function);
-    void renumber(IR::Function *function);
-
-public:
-    typedef QSharedPointer<LifeTimeIntervals> Ptr;
-    static Ptr create(IR::Function *function)
-    { return Ptr(new LifeTimeIntervals(function)); }
-
-    ~LifeTimeIntervals();
-
-    // takes ownership of the pointer
-    void add(LifeTimeInterval *interval)
-    { _intervals.append(interval); }
-
-    // After calling Optimizer::lifeTimeIntervals() the result will have all intervals in descending order of start position.
-    QVector<LifeTimeInterval *> intervals() const
-    { return _intervals; }
-
-    int size() const
-    { return _intervals.size(); }
-
-    int positionForStatement(Stmt *stmt) const
-    {
-        Q_ASSERT(stmt->id() >= 0);
-        if (static_cast<unsigned>(stmt->id()) < _positionForStatement.size())
-            return _positionForStatement[stmt->id()];
-
-        return Stmt::InvalidId;
-    }
-
-    int startPosition(BasicBlock *bb) const
-    {
-        Q_ASSERT(bb->index() >= 0);
-        Q_ASSERT(static_cast<unsigned>(bb->index()) < _basicBlockPosition.size());
-
-        return _basicBlockPosition.at(bb->index()).start;
-    }
-
-    int endPosition(BasicBlock *bb) const
-    {
-        Q_ASSERT(bb->index() >= 0);
-        Q_ASSERT(static_cast<unsigned>(bb->index()) < _basicBlockPosition.size());
-
-        return _basicBlockPosition.at(bb->index()).end;
-    }
-
-    int lastPosition() const
-    {
-        return _lastPosition;
-    }
-
-private:
-    struct BasicBlockPositions {
-        int start;
-        int end;
-
-        BasicBlockPositions()
-            : start(IR::Stmt::InvalidId)
-            , end(IR::Stmt::InvalidId)
-        {}
-    };
-
-    std::vector<BasicBlockPositions> _basicBlockPosition;
-    std::vector<int> _positionForStatement;
-    QVector<LifeTimeInterval *> _intervals;
-    int _lastPosition;
-};
-
-class Q_QML_PRIVATE_EXPORT Optimizer
-{
-    Q_DISABLE_COPY(Optimizer)
-
-public:
-    Optimizer(Function *function);
-
-    void run(QQmlEnginePrivate *qmlEngine, bool doTypeInference = true, bool peelLoops = true);
-    void convertOutOfSSA();
-
-    bool isInSSA() const
-    { return inSSA; }
-
-    QHash<BasicBlock *, BasicBlock *> loopStartEndBlocks() const { return startEndLoops; }
-
-    LifeTimeIntervals::Ptr lifeTimeIntervals() const;
-
-    BitVector calculateOptionalJumps();
-
-    static void showMeTheCode(Function *function, const char *marker);
-
-private:
-    Function *function;
-    bool inSSA;
-    QHash<BasicBlock *, BasicBlock *> startEndLoops;
-};
-
-class Q_QML_AUTOTEST_EXPORT MoveMapping
-{
-#ifdef V4_AUTOTEST
-public:
-#endif
-    struct Move {
-        Expr *from;
-        Temp *to;
-        bool needsSwap;
-
-        Move(Expr *from, Temp *to, bool needsSwap = false)
-            : from(from), to(to), needsSwap(needsSwap)
-        {}
-
-        bool operator==(const Move &other) const
-        { return from == other.from && to == other.to; }
-    };
-    typedef QList<Move> Moves;
-
-    Moves _moves;
-
-    static Moves sourceUsages(Expr *e, const Moves &moves);
-
-public:
-    void add(Expr *from, Temp *to);
-    void order();
-    QList<IR::Move *> insertMoves(BasicBlock *bb, Function *function, bool atEnd) const;
-
-    void dump() const;
-
-private:
-    int findLeaf() const;
-};
-
-/*
- * stack slot allocation:
- *
- * foreach bb do
- *   foreach stmt do
- *     if the current statement is not a phi-node:
- *       purge ranges that end before the current statement
- *       check for life ranges to activate, and if they don't have a stackslot associated then allocate one
- *       renumber temps to stack
- *     for phi nodes: check if all temps (src+dst) are assigned stack slots and marked as allocated
- *     if it's a jump:
- *       foreach phi node in the successor:
- *         allocate slots for each temp (both sources and targets) if they don't have one allocated already
- *         insert moves before the jump
- */
-class AllocateStackSlots: protected ConvertTemps
-{
-    IR::LifeTimeIntervals::Ptr _intervals;
-    QVector<IR::LifeTimeInterval *> _unhandled;
-    QVector<IR::LifeTimeInterval *> _live;
-    QBitArray _slotIsInUse;
-    IR::Function *_function;
-
-    int defPosition(IR::Stmt *s) const
-    {
-        return usePosition(s) + 1;
-    }
-
-    int usePosition(IR::Stmt *s) const
-    {
-        return _intervals->positionForStatement(s);
-    }
-
-public:
-    AllocateStackSlots(const IR::LifeTimeIntervals::Ptr &intervals)
-        : _intervals(intervals)
-        , _slotIsInUse(intervals->size(), false)
-        , _function(0)
-    {
-        _live.reserve(8);
-        _unhandled = _intervals->intervals();
-    }
-
-    void forFunction(IR::Function *function)
-    {
-        IR::Optimizer::showMeTheCode(function, "Before stack slot allocation");
-        _function = function;
-        toStackSlots(function);
-    }
-
-protected:
-    int allocateFreeSlot() override
-    {
-        for (int i = 0, ei = _slotIsInUse.size(); i != ei; ++i) {
-            if (!_slotIsInUse[i]) {
-                if (_nextUnusedStackSlot <= i) {
-                    Q_ASSERT(_nextUnusedStackSlot == i);
-                    _nextUnusedStackSlot = i + 1;
-                }
-                _slotIsInUse[i] = true;
-                return i;
-            }
-        }
-
-        Q_UNREACHABLE();
-        return -1;
-    }
-
-    void process(IR::Stmt *s) override
-    {
-//        qDebug("L%d statement %d:", _currentBasicBlock->index, s->id);
-
-        if (IR::Phi *phi = s->asPhi()) {
-            visitPhi(phi);
-        } else {
-            // purge ranges no longer alive:
-            for (int i = 0; i < _live.size(); ) {
-                const IR::LifeTimeInterval *lti = _live.at(i);
-                if (lti->end() < usePosition(s)) {
-//                    qDebug() << "\t - moving temp" << lti->temp().index << "to handled, freeing slot" << _stackSlotForTemp[lti->temp().index];
-                    _live.remove(i);
-                    Q_ASSERT(_slotIsInUse[_stackSlotForTemp[lti->temp().index]]);
-                    _slotIsInUse[_stackSlotForTemp[lti->temp().index]] = false;
-                    continue;
-                } else {
-                    ++i;
-                }
-            }
-
-            // active new ranges:
-            while (!_unhandled.isEmpty()) {
-                IR::LifeTimeInterval *lti = _unhandled.last();
-                if (lti->start() > defPosition(s))
-                    break; // we're done
-                Q_ASSERT(!_stackSlotForTemp.contains(lti->temp().index));
-                _stackSlotForTemp[lti->temp().index] = allocateFreeSlot();
-//                qDebug() << "\t - activating temp" << lti->temp().index << "on slot" << _stackSlotForTemp[lti->temp().index];
-                _live.append(lti);
-                _unhandled.removeLast();
-            }
-
-            visit(s);
-        }
-
-        if (IR::Jump *jump = s->asJump()) {
-            IR::MoveMapping moves;
-            for (IR::Stmt *succStmt : jump->target->statements()) {
-                if (IR::Phi *phi = succStmt->asPhi()) {
-                    forceActivation(*phi->targetTemp);
-                    for (int i = 0, ei = phi->incoming.size(); i != ei; ++i) {
-                        IR::Expr *e = phi->incoming[i];
-                        if (IR::Temp *t = e->asTemp()) {
-                            forceActivation(*t);
-                        }
-                        if (jump->target->in[i] == _currentBasicBlock)
-                            moves.add(phi->incoming[i], phi->targetTemp);
-                    }
-                } else {
-                    break;
-                }
-            }
-            moves.order();
-            const QList<IR::Move *> newMoves = moves.insertMoves(_currentBasicBlock, _function, true);
-            for (IR::Move *move : newMoves)
-                visit(move);
-        }
-    }
-
-    void forceActivation(const IR::Temp &t)
-    {
-        if (_stackSlotForTemp.contains(t.index))
-            return;
-
-        int i = _unhandled.size() - 1;
-        for (; i >= 0; --i) {
-            IR::LifeTimeInterval *lti = _unhandled[i];
-            if (lti->temp() == t) {
-                _live.append(lti);
-                _unhandled.remove(i);
-                break;
-            }
-        }
-        Q_ASSERT(i >= 0); // check that we always found the entry
-
-        _stackSlotForTemp[t.index] = allocateFreeSlot();
-//        qDebug() << "\t - force activating temp" << t.index << "on slot" << _stackSlotForTemp[t.index];
-    }
-
-    void visitPhi(IR::Phi *phi) override
-    {
-        Q_UNUSED(phi);
-#if !defined(QT_NO_DEBUG)
-        Q_ASSERT(_stackSlotForTemp.contains(phi->targetTemp->index));
-        Q_ASSERT(_slotIsInUse[_stackSlotForTemp[phi->targetTemp->index]]);
-        for (IR::Expr *e : phi->incoming) {
-            if (IR::Temp *t = e->asTemp())
-                Q_ASSERT(_stackSlotForTemp.contains(t->index));
-        }
-#endif // defined(QT_NO_DEBUG)
-    }
-};
-
-} // IR namespace
-} // QV4 namespace
-
-
-Q_DECLARE_TYPEINFO(QV4::IR::LifeTimeInterval, Q_MOVABLE_TYPE);
-
-QT_END_NAMESPACE
-
-#endif // QV4SSA_P_H
diff --git a/src/qml/debugger/qqmlprofiler_p.h b/src/qml/debugger/qqmlprofiler_p.h
index 9ffe6ff247..f17b1a7528 100644
--- a/src/qml/debugger/qqmlprofiler_p.h
+++ b/src/qml/debugger/qqmlprofiler_p.h
@@ -151,74 +151,120 @@ class Q_QML_PRIVATE_EXPORT QQmlProfiler : public QObject, public QQmlProfilerDef
     Q_OBJECT
 public:
 
-    class FunctionRefCount : public QQmlRefCount {
-    public:
-        FunctionRefCount(QV4::Function *function):
-            m_function(function)
+    struct Location {
+        Location(const QQmlSourceLocation &location = QQmlSourceLocation(),
+                 const QUrl &url = QUrl()) :
+            location(location), url(url) {}
+        QQmlSourceLocation location;
+        QUrl url;
+    };
+
+    // Unfortunately we have to resolve the locations right away because the QML context might not
+    // be available anymore when we send the data.
+    struct RefLocation : public Location {
+        RefLocation()
+            : Location(), locationType(MaximumRangeType), sent(false)
         {
-            m_function->compilationUnit->addref();
+            function = nullptr;
         }
 
-        FunctionRefCount(const FunctionRefCount &other) :
-            QQmlRefCount(other), m_function(other.m_function)
+        RefLocation(QV4::Function *ref)
+            : Location(ref->sourceLocation()), locationType(Binding), sent(false)
         {
-            m_function->compilationUnit->addref();
+            function = ref;
+            function->compilationUnit->addref();
         }
 
-        FunctionRefCount &operator=(const FunctionRefCount &other)
+        RefLocation(QV4::CompiledData::CompilationUnit *ref, const QUrl &url, const QV4::CompiledData::Object *obj, const QString &type)
+            : Location(QQmlSourceLocation(type, obj->location.line, obj->location.column), url),
+              locationType(Creating), sent(false)
+        {
+            unit = ref;
+            unit->addref();
+        }
+
+        RefLocation(QQmlBoundSignalExpression *ref)
+            : Location(ref->sourceLocation()), locationType(HandlingSignal), sent(false)
+        {
+            boundSignal = ref;
+            boundSignal->addref();
+        }
+
+        RefLocation(QQmlDataBlob *ref)
+            : Location(QQmlSourceLocation()), locationType(Compiling), sent(false)
+        {
+            blob = ref;
+            blob->addref();
+        }
+
+        RefLocation(const RefLocation &other)
+            : Location(other),
+              locationType(other.locationType),
+              function(other.function),
+              sent(other.sent)
+        {
+            addref();
+        }
+
+        RefLocation &operator=(const RefLocation &other)
         {
             if (this != &other) {
-                QQmlRefCount::operator=(other);
-                other.m_function->compilationUnit->addref();
-                m_function->compilationUnit->release();
-                m_function = other.m_function;
+                release();
+                Location::operator=(other);
+                locationType = other.locationType;
+                function = other.function;
+                sent = other.sent;
+                addref();
             }
             return *this;
         }
 
-        ~FunctionRefCount()
+        ~RefLocation()
         {
-            m_function->compilationUnit->release();
+            release();
         }
 
-    private:
-        QV4::Function *m_function;
-    };
-
-    struct Location {
-        Location(const QQmlSourceLocation &location = QQmlSourceLocation(),
-                 const QUrl &url = QUrl()) :
-            location(location), url(url) {}
-        QQmlSourceLocation location;
-        QUrl url;
-    };
+        void addref()
+        {
+            switch (locationType) {
+            case Binding:
+                function->compilationUnit->addref();
+                break;
+            case Creating:
+                unit->addref();
+                break;
+            case HandlingSignal:
+                boundSignal->addref();
+                break;
+            case Compiling:
+                blob->addref();
+                break;
+            default:
+                Q_ASSERT(locationType == MaximumRangeType);
+                break;
+            }
+        }
 
-    // Unfortunately we have to resolve the locations right away because the QML context might not
-    // be available anymore when we send the data.
-    struct RefLocation : public Location {
-        RefLocation() : Location(), locationType(MaximumRangeType), ref(nullptr), sent(false)
-        {}
-
-        RefLocation(QV4::Function *function) :
-            Location(function->sourceLocation()), locationType(Binding),
-            ref(new FunctionRefCount(function),
-                QQmlRefPointer<QQmlRefCount>::Adopt), sent(false)
-        {}
-
-        RefLocation(QV4::CompiledData::CompilationUnit *ref, const QUrl &url, const QV4::CompiledData::Object *obj,
-                    const QString &type) :
-            Location(QQmlSourceLocation(type, obj->location.line, obj->location.column), url),
-            locationType(Creating), ref(ref), sent(false)
-        {}
-
-        RefLocation(QQmlBoundSignalExpression *ref) :
-            Location(ref->sourceLocation()), locationType(HandlingSignal), ref(ref), sent(false)
-        {}
-
-        RefLocation(QQmlDataBlob *ref) :
-            Location(QQmlSourceLocation(), ref->url()), locationType(Compiling), ref(ref),
-            sent(false)
-        {}
+        void release()
+        {
+            switch (locationType) {
+            case Binding:
+                function->compilationUnit->release();
+                break;
+            case Creating:
+                unit->release();
+                break;
+            case HandlingSignal:
+                boundSignal->release();
+                break;
+            case Compiling:
+                blob->release();
+                break;
+            default:
+                Q_ASSERT(locationType == MaximumRangeType);
+                break;
+            }
+        }
 
         bool isValid() const
         {
@@ -226,7 +272,12 @@ public:
         }
 
         RangeType locationType;
-        QQmlRefPointer<QQmlRefCount> ref;
+        union {
+            QV4::Function *function;
+            QV4::CompiledData::CompilationUnit *unit;
+            QQmlBoundSignalExpression *boundSignal;
+            QQmlDataBlob *blob;
+        };
         bool sent;
     };
 
diff --git a/src/qml/jit/jit.pri b/src/qml/jit/jit.pri
index 7ea4e951d5..2080844d93 100644
--- a/src/qml/jit/jit.pri
+++ b/src/qml/jit/jit.pri
@@ -1,22 +1,10 @@
-include(../../3rdparty/masm/masm-defs.pri)
-
 INCLUDEPATH += $$PWD
 INCLUDEPATH += $$OUT_PWD
 
-HEADERS += \
-    $$PWD/qv4assembler_p.h \
-    $$PWD/qv4regalloc_p.h \
-    $$PWD/qv4targetplatform_p.h \
-    $$PWD/qv4isel_masm_p.h \
-    $$PWD/qv4binop_p.h \
-    $$PWD/qv4unop_p.h \
-    $$PWD/qv4registerinfo_p.h
-
 SOURCES += \
-    $$PWD/qv4assembler.cpp \
-    $$PWD/qv4regalloc.cpp \
-    $$PWD/qv4isel_masm.cpp \
-    $$PWD/qv4binop.cpp \
-    $$PWD/qv4unop.cpp \
+    $$PWD/qv4jit.cpp \
+    $$PWD/qv4assembler.cpp
 
-include(../../3rdparty/masm/masm.pri)
+HEADERS += \
+    $$PWD/qv4jit_p.h \
+    $$PWD/qv4assembler_p.h
diff --git a/src/qml/jit/qv4assembler.cpp b/src/qml/jit/qv4assembler.cpp
index d062f3bbb2..e357211074 100644
--- a/src/qml/jit/qv4assembler.cpp
+++ b/src/qml/jit/qv4assembler.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtQml module of the Qt Toolkit.
@@ -37,510 +37,1105 @@
 **
 ****************************************************************************/
 
-#include "qv4isel_masm_p.h"
-#include "qv4runtime_p.h"
-#include "qv4ssa_p.h"
-#include "qv4regalloc_p.h"
+#include <QBuffer>
+
+#include "qv4engine_p.h"
 #include "qv4assembler_p.h"
+#include <private/qv4function_p.h>
+#include <private/qv4runtime_p.h>
 
+#include <wtf/Vector.h>
+#include <assembler/MacroAssembler.h>
+#include <assembler/MacroAssemblerCodeRef.h>
 #include <assembler/LinkBuffer.h>
 #include <WTFStubs.h>
 
-#if !defined(V4_BOOTSTRAP)
-#include "qv4function_p.h"
+#undef ENABLE_ALL_ASSEMBLERS_FOR_REFACTORING_PURPOSES
+
+#ifdef Q_STATIC_ASSERT_FOR_SANE_COMPILERS
+#  undef Q_STATIC_ASSERT_FOR_SANE_COMPILERS
+#endif
+#if defined(Q_CC_MSVC) && _MSC_VER < 1900
+#  define Q_STATIC_ASSERT_FOR_SANE_COMPILERS(x) // insane
+#else
+#  define Q_STATIC_ASSERT_FOR_SANE_COMPILERS(x) Q_STATIC_ASSERT(x)
 #endif
 
-#include <iostream>
-#include <QBuffer>
-#include <QCoreApplication>
+#ifdef V4_ENABLE_JIT
 
-#if ENABLE(ASSEMBLER)
+QT_BEGIN_NAMESPACE
+namespace QV4 {
+namespace JIT {
 
-#if USE(UDIS86)
-#  include <udis86.h>
-#endif
+#define callHelper(x) PlatformAssemblerCommon::callRuntime(#x, reinterpret_cast<void *>(&x))
 
-using namespace QV4;
-using namespace QV4::JIT;
+const QV4::Value::ValueTypeInternal IntegerTag = QV4::Value::ValueTypeInternal::Integer;
 
-CompilationUnit::~CompilationUnit()
+static ReturnedValue toNumberHelper(ReturnedValue v)
 {
+    return Encode(Value::fromReturnedValue(v).toNumber());
 }
 
-#if !defined(V4_BOOTSTRAP)
+static ReturnedValue toInt32Helper(ReturnedValue v)
+{
+    return Encode(Value::fromReturnedValue(v).toInt32());
+}
 
-void CompilationUnit::linkBackendToEngine(ExecutionEngine *engine)
+#if defined(Q_PROCESSOR_X86_64) || defined(ENABLE_ALL_ASSEMBLERS_FOR_REFACTORING_PURPOSES)
+#if defined(Q_OS_LINUX) || defined(Q_OS_QNX) || defined(Q_OS_FREEBSD) || defined(Q_OS_DARWIN)
+
+struct PlatformAssembler_X86_64_SysV : JSC::MacroAssembler<JSC::MacroAssemblerX86_64>
 {
-    runtimeFunctions.resize(data->functionTableSize);
-    runtimeFunctions.fill(0);
-    for (int i = 0 ;i < runtimeFunctions.size(); ++i) {
-        const CompiledData::Function *compiledFunction = data->functionAt(i);
+    static const RegisterID NoRegister = RegisterID(-1);
+
+    static const RegisterID ReturnValueRegister   = RegisterID::eax;
+    static const RegisterID AccumulatorRegister   = RegisterID::eax;
+    static const RegisterID AccumulatorRegisterValue = AccumulatorRegister;
+    static const RegisterID ScratchRegister       = RegisterID::r10;
+    static const RegisterID ScratchRegister2      = RegisterID::r9; // Note: overlaps with Arg5Reg, so do not use while setting up a call!
+    static const RegisterID JSStackFrameRegister  = RegisterID::r12;
+    static const RegisterID CppStackFrameRegister = RegisterID::r13;
+    static const RegisterID EngineRegister        = RegisterID::r14;
+    static const RegisterID StackPointerRegister  = RegisterID::esp;
+    static const RegisterID FramePointerRegister  = RegisterID::ebp;
+    static const FPRegisterID FPScratchRegister   = FPRegisterID::xmm1;
+
+    static const RegisterID Arg0Reg = RegisterID::edi;
+    static const RegisterID Arg1Reg = RegisterID::esi;
+    static const RegisterID Arg2Reg = RegisterID::edx;
+    static const RegisterID Arg3Reg = RegisterID::ecx;
+    static const RegisterID Arg4Reg = RegisterID::r8;
+    static const RegisterID Arg5Reg = RegisterID::r9;
+    static const RegisterID Arg6Reg = NoRegister;
+    static const RegisterID Arg7Reg = NoRegister;
+    static const int ArgInRegCount = 6;
+
+    void popValue()
+    {
+        addPtr(TrustedImmPtr(sizeof(ReturnedValue)), StackPointerRegister);
+    }
 
-        QV4::Function *runtimeFunction = new QV4::Function(engine, this, compiledFunction,
-                                                           (ReturnedValue (*)(QV4::ExecutionEngine *, const uchar *)) codeRefs[i].code().executableAddress());
-        runtimeFunctions[i] = runtimeFunction;
+    void generatePlatformFunctionEntry()
+    {
+        push(RegisterID::ebp);
+        move(RegisterID::esp, RegisterID::ebp);
+        move(TrustedImmPtr(nullptr), AccumulatorRegister); push(AccumulatorRegister); // exceptionHandler
+        push(JSStackFrameRegister);
+        push(CppStackFrameRegister);
+        push(EngineRegister);
+        move(Arg0Reg, CppStackFrameRegister);
+        move(Arg1Reg, EngineRegister);
+        loadPtr(Address(CppStackFrameRegister, offsetof(CppStackFrame, jsFrame)), JSStackFrameRegister);
     }
-}
 
-bool CompilationUnit::memoryMapCode(QString *errorString)
-{
-    Q_UNUSED(errorString);
-    codeRefs.resize(data->functionTableSize);
+    void generatePlatformFunctionExit()
+    {
+        pop(EngineRegister);
+        pop(CppStackFrameRegister);
+        pop(JSStackFrameRegister);
+        pop(); // exceptionHandler
+        pop(RegisterID::ebp);
+        ret();
+    }
 
-    const char *basePtr = reinterpret_cast<const char *>(data);
+    void callAbsolute(const void *funcPtr)
+    {
+        move(TrustedImmPtr(funcPtr), ScratchRegister);
+        call(ScratchRegister);
+    }
 
-    for (uint i = 0; i < data->functionTableSize; ++i) {
-        const CompiledData::Function *compiledFunction = data->functionAt(i);
-        void *codePtr = const_cast<void *>(reinterpret_cast<const void *>(basePtr + compiledFunction->codeOffset));
-        JSC::MacroAssemblerCodeRef codeRef = JSC::MacroAssemblerCodeRef::createSelfManagedCodeRef(JSC::MacroAssemblerCodePtr(codePtr));
-        JSC::ExecutableAllocator::makeExecutable(codePtr, compiledFunction->codeSize);
-        codeRefs[i] = codeRef;
+    void pushAligned(RegisterID reg)
+    {
+        subPtr(TrustedImm32(PointerSize), StackPointerRegister);
+        push(reg);
+    }
 
-        static const bool showCode = qEnvironmentVariableIsSet("QV4_SHOW_ASM");
-        if (showCode) {
-            WTF::dataLogF("Mapped JIT code for %s\n", qPrintable(stringAt(compiledFunction->nameIndex)));
-            disassemble(codeRef.code(), compiledFunction->codeSize, "    ", WTF::dataFile());
-        }
+    void popAligned(RegisterID reg)
+    {
+        pop(reg);
+        addPtr(TrustedImm32(PointerSize), StackPointerRegister);
     }
+};
 
-    return true;
-}
+typedef PlatformAssembler_X86_64_SysV PlatformAssemblerBase;
 
-#endif // !defined(V4_BOOTSTRAP)
+#endif
+#if defined(Q_OS_WIN)
 
-void CompilationUnit::prepareCodeOffsetsForDiskStorage(CompiledData::Unit *unit)
+struct PlatformAssembler_Win64 : JSC::MacroAssembler<JSC::MacroAssemblerX86_64>
 {
-    const int codeAlignment = 16;
-    quint64 offset = WTF::roundUpToMultipleOf(codeAlignment, unit->unitSize);
-    Q_ASSERT(int(unit->functionTableSize) == codeRefs.size());
-    for (int i = 0; i < codeRefs.size(); ++i) {
-        CompiledData::Function *compiledFunction = const_cast<CompiledData::Function *>(unit->functionAt(i));
-        compiledFunction->codeOffset = offset;
-        compiledFunction->codeSize = codeRefs.at(i).size();
-        offset = WTF::roundUpToMultipleOf(codeAlignment, offset + compiledFunction->codeSize);
+    static const RegisterID NoRegister = RegisterID(-1);
+
+    static const RegisterID ReturnValueRegister   = RegisterID::eax;
+    static const RegisterID AccumulatorRegister   = RegisterID::eax;
+    static const RegisterID AccumulatorRegisterValue = AccumulatorRegister;
+    static const RegisterID ScratchRegister       = RegisterID::r10;
+    static const RegisterID ScratchRegister2      = RegisterID::r9; // Note: overlaps with Arg3Reg, so do not use while setting up a call!
+    static const RegisterID JSStackFrameRegister  = RegisterID::r12;
+    static const RegisterID CppStackFrameRegister = RegisterID::r13;
+    static const RegisterID EngineRegister        = RegisterID::r14;
+    static const RegisterID StackPointerRegister  = RegisterID::esp;
+    static const RegisterID FramePointerRegister  = RegisterID::ebp;
+    static const FPRegisterID FPScratchRegister   = FPRegisterID::xmm1;
+
+    static const RegisterID Arg0Reg = RegisterID::ecx;
+    static const RegisterID Arg1Reg = RegisterID::edx;
+    static const RegisterID Arg2Reg = RegisterID::r8;
+    static const RegisterID Arg3Reg = RegisterID::r9;
+    static const RegisterID Arg4Reg = NoRegister;
+    static const RegisterID Arg5Reg = NoRegister;
+    static const RegisterID Arg6Reg = NoRegister;
+    static const RegisterID Arg7Reg = NoRegister;
+    static const int ArgInRegCount = 4;
+
+    void popValue()
+    {
+        addPtr(TrustedImmPtr(sizeof(ReturnedValue)), StackPointerRegister);
     }
-}
 
-bool CompilationUnit::saveCodeToDisk(QIODevice *device, const CompiledData::Unit *unit, QString *errorString)
+    void generatePlatformFunctionEntry()
+    {
+        push(RegisterID::ebp);
+        move(RegisterID::esp, RegisterID::ebp);
+        move(TrustedImmPtr(nullptr), AccumulatorRegister); push(AccumulatorRegister); // exceptionHandler
+        push(JSStackFrameRegister);
+        push(CppStackFrameRegister);
+        push(EngineRegister);
+        move(Arg0Reg, CppStackFrameRegister);
+        move(Arg1Reg, EngineRegister);
+        loadPtr(Address(CppStackFrameRegister, offsetof(CppStackFrame, jsFrame)), JSStackFrameRegister);
+    }
+
+    void generatePlatformFunctionExit()
+    {
+        pop(EngineRegister);
+        pop(CppStackFrameRegister);
+        pop(JSStackFrameRegister);
+        pop(); // exceptionHandler
+        pop(RegisterID::ebp);
+        ret();
+    }
+
+    void callAbsolute(const void *funcPtr)
+    {
+        move(TrustedImmPtr(funcPtr), ScratchRegister);
+        subPtr(TrustedImm32(4 * PointerSize), StackPointerRegister);
+        call(ScratchRegister);
+        addPtr(TrustedImm32(4 * PointerSize), StackPointerRegister);
+    }
+
+    void pushAligned(RegisterID reg)
+    {
+        subPtr(TrustedImm32(PointerSize), StackPointerRegister);
+        push(reg);
+    }
+
+    void popAligned(RegisterID reg)
+    {
+        pop(reg);
+        addPtr(TrustedImm32(PointerSize), StackPointerRegister);
+    }
+};
+
+typedef PlatformAssembler_Win64 PlatformAssemblerBase;
+
+#endif
+#endif
+
+#if (defined(Q_PROCESSOR_X86) && !defined(Q_PROCESSOR_X86_64)) || defined(ENABLE_ALL_ASSEMBLERS_FOR_REFACTORING_PURPOSES)
+
+struct PlatformAssembler_X86_All : JSC::MacroAssembler<JSC::MacroAssemblerX86>
 {
-    Q_ASSERT(device->pos() == unit->unitSize);
-    Q_ASSERT(device->atEnd());
-    Q_ASSERT(int(unit->functionTableSize) == codeRefs.size());
+    static const RegisterID NoRegister = RegisterID(-1);
+
+    static const RegisterID ReturnValueRegisterValue = RegisterID::eax;
+    static const RegisterID ReturnValueRegisterTag   = RegisterID::edx;
+    static const RegisterID ScratchRegister          = RegisterID::ecx;
+    static const RegisterID AccumulatorRegisterValue = ReturnValueRegisterValue;
+    static const RegisterID AccumulatorRegisterTag   = ReturnValueRegisterTag;
+    static const RegisterID JSStackFrameRegister  = RegisterID::ebx;
+    static const RegisterID CppStackFrameRegister = RegisterID::esi;
+    static const RegisterID EngineRegister        = RegisterID::edi;
+    static const RegisterID StackPointerRegister  = RegisterID::esp;
+    static const RegisterID FramePointerRegister  = RegisterID::ebp;
+    static const FPRegisterID FPScratchRegister   = FPRegisterID::xmm1;
+
+    static const RegisterID Arg0Reg = NoRegister;
+    static const RegisterID Arg1Reg = NoRegister;
+    static const RegisterID Arg2Reg = NoRegister;
+    static const RegisterID Arg3Reg = NoRegister;
+    static const RegisterID Arg4Reg = NoRegister;
+    static const RegisterID Arg5Reg = NoRegister;
+    static const RegisterID Arg6Reg = NoRegister;
+    static const RegisterID Arg7Reg = NoRegister;
+    static const int ArgInRegCount = 0;
+
+    void popValue()
+    {
+        addPtr(TrustedImmPtr(sizeof(ReturnedValue)), StackPointerRegister);
+    }
 
-    QByteArray padding;
+    void generatePlatformFunctionEntry()
+    {
+        push(RegisterID::ebp);
+        move(RegisterID::esp, RegisterID::ebp);
+        move(TrustedImmPtr(nullptr), AccumulatorRegisterValue); push(AccumulatorRegisterValue); // exceptionHandler
+        push(JSStackFrameRegister);
+        push(CppStackFrameRegister);
+        push(EngineRegister);
+        loadPtr(Address(FramePointerRegister, 2 * PointerSize), CppStackFrameRegister);
+        loadPtr(Address(FramePointerRegister, 3 * PointerSize), EngineRegister);
+        loadPtr(Address(CppStackFrameRegister, offsetof(CppStackFrame, jsFrame)), JSStackFrameRegister);
+    }
 
-    for (int i = 0; i < codeRefs.size(); ++i) {
-        const CompiledData::Function *compiledFunction = unit->functionAt(i);
+    void generatePlatformFunctionExit()
+    {
+        pop(EngineRegister);
+        pop(CppStackFrameRegister);
+        pop(JSStackFrameRegister);
+        pop(); // exceptionHandler
+        pop(RegisterID::ebp);
+        ret();
+    }
 
-        if (device->pos() > qint64(compiledFunction->codeOffset)) {
-            *errorString = QStringLiteral("Invalid state of cache file to write.");
-            return false;
-        }
+    void callAbsolute(const void *funcPtr)
+    {
+        move(TrustedImmPtr(funcPtr), ScratchRegister);
+        call(ScratchRegister);
+    }
 
-        const quint64 paddingSize = compiledFunction->codeOffset - device->pos();
-        padding.fill(0, paddingSize);
-        qint64 written = device->write(padding);
-        if (written != padding.size()) {
-            *errorString = device->errorString();
-            return false;
-        }
+    void pushAligned(RegisterID reg)
+    {
+        subPtr(TrustedImm32(PointerSize), StackPointerRegister);
+        push(reg);
+    }
 
-        const void *undecoratedCodePtr = codeRefs.at(i).code().dataLocation();
-        written = device->write(reinterpret_cast<const char *>(undecoratedCodePtr), compiledFunction->codeSize);
-        if (written != qint64(compiledFunction->codeSize)) {
-            *errorString = device->errorString();
-            return false;
-        }
+    void popAligned(RegisterID reg)
+    {
+        pop(reg);
+        addPtr(TrustedImm32(PointerSize), StackPointerRegister);
     }
-    return true;
-}
+};
 
-template <typename TargetConfiguration>
-Assembler<TargetConfiguration>::Assembler(QV4::Compiler::JSUnitGenerator *jsGenerator, IR::Function* function, QV4::ExecutableAllocator *executableAllocator)
-    : _function(function)
-    , _nextBlock(0)
-    , _executableAllocator(executableAllocator)
-    , _jsGenerator(jsGenerator)
-{
-    _addrs.resize(_function->basicBlockCount());
-    _patches.resize(_function->basicBlockCount());
-    _labelPatches.resize(_function->basicBlockCount());
-}
+typedef PlatformAssembler_X86_All PlatformAssemblerBase;
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::registerBlock(IR::BasicBlock* block, IR::BasicBlock *nextBlock)
-{
-    _addrs[block->index()] = label();
-    catchBlock = block->catchBlock;
-    _nextBlock = nextBlock;
-}
+#endif
+
+#if defined(Q_PROCESSOR_ARM_64) || defined(ENABLE_ALL_ASSEMBLERS_FOR_REFACTORING_PURPOSES)
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::jumpToBlock(IR::BasicBlock* current, IR::BasicBlock *target)
+struct PlatformAssembler_ARM64 : JSC::MacroAssembler<JSC::MacroAssemblerARM64>
 {
-    Q_UNUSED(current);
+    static const RegisterID NoRegister = RegisterID(-1);
+
+    static const RegisterID ReturnValueRegister   = JSC::ARM64Registers::x0;
+    static const RegisterID AccumulatorRegister   = JSC::ARM64Registers::x9;
+    static const RegisterID AccumulatorRegisterValue = AccumulatorRegister;
+    static const RegisterID ScratchRegister       = JSC::ARM64Registers::x10;
+    static const RegisterID ScratchRegister2      = JSC::ARM64Registers::x7; // Note: overlaps with Arg7Reg, so do not use while setting up a call!
+    static const RegisterID JSStackFrameRegister  = JSC::ARM64Registers::x19;
+    static const RegisterID CppStackFrameRegister = JSC::ARM64Registers::x20;
+    static const RegisterID EngineRegister        = JSC::ARM64Registers::x21;
+    static const RegisterID StackPointerRegister  = JSC::ARM64Registers::sp;
+    static const RegisterID FramePointerRegister  = JSC::ARM64Registers::fp;
+    static const FPRegisterID FPScratchRegister   = JSC::ARM64Registers::q1;
+
+    static const RegisterID Arg0Reg = JSC::ARM64Registers::x0;
+    static const RegisterID Arg1Reg = JSC::ARM64Registers::x1;
+    static const RegisterID Arg2Reg = JSC::ARM64Registers::x2;
+    static const RegisterID Arg3Reg = JSC::ARM64Registers::x3;
+    static const RegisterID Arg4Reg = JSC::ARM64Registers::x4;
+    static const RegisterID Arg5Reg = JSC::ARM64Registers::x5;
+    static const RegisterID Arg6Reg = JSC::ARM64Registers::x6;
+    static const RegisterID Arg7Reg = JSC::ARM64Registers::x7;
+    static const int ArgInRegCount = 8;
+
+    void push(RegisterID src)
+    {
+        pushToSave(src);
+    }
 
-    if (target != _nextBlock)
-        _patches[target->index()].push_back(jump());
-}
+    void pop(RegisterID dest)
+    {
+        popToRestore(dest);
+    }
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::addPatch(IR::BasicBlock* targetBlock, Jump targetJump)
-{
-    _patches[targetBlock->index()].push_back(targetJump);
-}
+    void pop()
+    {
+        add64(TrustedImm32(16), stackPointerRegister);
+    }
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::addPatch(DataLabelPtr patch, Label target)
-{
-    DataLabelPatch p;
-    p.dataLabel = patch;
-    p.target = target;
-    _dataLabelPatches.push_back(p);
-}
+    void popValue()
+    {
+        pop();
+    }
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::addPatch(DataLabelPtr patch, IR::BasicBlock *target)
-{
-    _labelPatches[target->index()].push_back(patch);
-}
+    void generatePlatformFunctionEntry()
+    {
+        pushPair(JSC::ARM64Registers::fp, JSC::ARM64Registers::lr);
+        move(RegisterID::sp, RegisterID::fp);
+        move(TrustedImmPtr(nullptr), AccumulatorRegister); // exceptionHandler
+        pushPair(JSStackFrameRegister, AccumulatorRegister);
+        pushPair(EngineRegister, CppStackFrameRegister);
+        move(Arg0Reg, CppStackFrameRegister);
+        move(Arg1Reg, EngineRegister);
+    }
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::generateCJumpOnNonZero(RegisterID reg, IR::BasicBlock *currentBlock,
-                                       IR::BasicBlock *trueBlock, IR::BasicBlock *falseBlock)
-{
-    generateCJumpOnCompare(RelationalCondition::NotEqual, reg, TrustedImm32(0), currentBlock, trueBlock, falseBlock);
-}
+    void generatePlatformFunctionExit()
+    {
+        move(AccumulatorRegister, ReturnValueRegister);
+        popPair(EngineRegister, CppStackFrameRegister);
+        popPair(JSStackFrameRegister, AccumulatorRegister);
+        popPair(JSC::ARM64Registers::fp, JSC::ARM64Registers::lr);
+        ret();
+    }
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::generateCJumpOnCompare(RelationalCondition cond,
-                                       RegisterID left,
-                                       TrustedImm32 right,
-                                       IR::BasicBlock *currentBlock,
-                                       IR::BasicBlock *trueBlock,
-                                       IR::BasicBlock *falseBlock)
-{
-    if (trueBlock == _nextBlock) {
-        Jump target = branch32(invert(cond), left, right);
-        addPatch(falseBlock, target);
-    } else {
-        Jump target = branch32(cond, left, right);
-        addPatch(trueBlock, target);
-        jumpToBlock(currentBlock, falseBlock);
+    void callAbsolute(const void *funcPtr)
+    {
+        move(TrustedImmPtr(funcPtr), ScratchRegister);
+        call(ScratchRegister);
     }
-}
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::generateCJumpOnCompare(RelationalCondition cond,
-                                       RegisterID left,
-                                       RegisterID right,
-                                       IR::BasicBlock *currentBlock,
-                                       IR::BasicBlock *trueBlock,
-                                       IR::BasicBlock *falseBlock)
-{
-    if (trueBlock == _nextBlock) {
-        Jump target = branch32(invert(cond), left, right);
-        addPatch(falseBlock, target);
-    } else {
-        Jump target = branch32(cond, left, right);
-        addPatch(trueBlock, target);
-        jumpToBlock(currentBlock, falseBlock);
+    void pushAligned(RegisterID reg)
+    {
+        pushToSave(reg);
     }
-}
 
-template <typename TargetConfiguration>
-typename Assembler<TargetConfiguration>::Pointer
-Assembler<TargetConfiguration>::loadAddressForWriting(RegisterID tmp, IR::Expr *e, WriteBarrier::Type *barrier)
-{
-    if (barrier)
-        *barrier = WriteBarrier::NoBarrier;
-    IR::Temp *t = e->asTemp();
-    if (t)
-        return loadTempAddress(t);
-    else
-        return loadArgLocalAddressForWriting(tmp, e->asArgLocal(), barrier);
-}
+    void popAligned(RegisterID reg)
+    {
+        popToRestore(reg);
+    }
+};
 
-template <typename TargetConfiguration>
-typename Assembler<TargetConfiguration>::Pointer Assembler<TargetConfiguration>::loadTempAddress(IR::Temp *t)
+typedef PlatformAssembler_ARM64 PlatformAssemblerBase;
+
+#endif
+
+#if defined(Q_PROCESSOR_ARM_32) || defined(ENABLE_ALL_ASSEMBLERS_FOR_REFACTORING_PURPOSES)
+
+struct PlatformAssembler_ARM32 : JSC::MacroAssembler<JSC::MacroAssemblerARMv7>
 {
-    if (t->kind == IR::Temp::StackSlot)
-        return stackSlotPointer(t);
-    else
-        Q_UNREACHABLE();
-}
+    static const RegisterID NoRegister = RegisterID(-1);
+
+    static const RegisterID ReturnValueRegisterValue = JSC::ARMRegisters::r0;
+    static const RegisterID ReturnValueRegisterTag   = JSC::ARMRegisters::r1;
+    static const RegisterID ScratchRegister          = JSC::ARMRegisters::r2;
+    static const RegisterID AccumulatorRegisterValue = JSC::ARMRegisters::r4;
+    static const RegisterID AccumulatorRegisterTag   = JSC::ARMRegisters::r5;
+    // r6 is used by MacroAssemblerARMv7
+    static const RegisterID JSStackFrameRegister     = JSC::ARMRegisters::r8;
+    static const RegisterID CppStackFrameRegister    = JSC::ARMRegisters::r10;
+#if CPU(ARM_THUMB2) || defined(V4_BOOTSTRAP)
+    static const RegisterID FramePointerRegister     = JSC::ARMRegisters::r7;
+    static const RegisterID EngineRegister           = JSC::ARMRegisters::r11;
+#else // Thumbs down
+    static const RegisterID FramePointerRegister     = JSC::ARMRegisters::r11;
+    static const RegisterID EngineRegister           = JSC::ARMRegisters::r7;
+#endif
+    static const RegisterID StackPointerRegister     = JSC::ARMRegisters::r13;
+    static const FPRegisterID FPScratchRegister      = JSC::ARMRegisters::d1;
+
+    static const RegisterID Arg0Reg = JSC::ARMRegisters::r0;
+    static const RegisterID Arg1Reg = JSC::ARMRegisters::r1;
+    static const RegisterID Arg2Reg = JSC::ARMRegisters::r2;
+    static const RegisterID Arg3Reg = JSC::ARMRegisters::r3;
+    static const RegisterID Arg4Reg = NoRegister;
+    static const RegisterID Arg5Reg = NoRegister;
+    static const RegisterID Arg6Reg = NoRegister;
+    static const RegisterID Arg7Reg = NoRegister;
+    static const int ArgInRegCount = 4;
+
+    void popValue()
+    {
+        addPtr(TrustedImm32(sizeof(ReturnedValue)), StackPointerRegister);
+    }
 
-template <typename TargetConfiguration>
-typename Assembler<TargetConfiguration>::Pointer
-Assembler<TargetConfiguration>::loadArgLocalAddressForWriting(RegisterID baseReg, IR::ArgLocal *al, WriteBarrier::Type *barrier)
+    void generatePlatformFunctionEntry()
+    {
+        push(JSC::ARMRegisters::lr);
+        push(FramePointerRegister);
+        move(StackPointerRegister, FramePointerRegister);
+        push(TrustedImm32(0)); // exceptionHandler
+        push(AccumulatorRegisterValue);
+        push(AccumulatorRegisterTag);
+        push(addressTempRegister);
+        push(JSStackFrameRegister);
+        push(CppStackFrameRegister);
+        push(EngineRegister);
+        subPtr(TrustedImm32(4), StackPointerRegister); // stack alignment
+        move(Arg0Reg, CppStackFrameRegister);
+        move(Arg1Reg, EngineRegister);
+    }
+
+    void generatePlatformFunctionExit()
+    {
+        move(AccumulatorRegisterValue, ReturnValueRegisterValue);
+        move(AccumulatorRegisterTag, ReturnValueRegisterTag);
+        addPtr(TrustedImm32(4), StackPointerRegister); // stack alignment
+        pop(EngineRegister);
+        pop(CppStackFrameRegister);
+        pop(JSStackFrameRegister);
+        pop(addressTempRegister);
+        pop(AccumulatorRegisterTag);
+        pop(AccumulatorRegisterValue);
+        pop(); // exceptionHandler
+        pop(FramePointerRegister);
+        pop(JSC::ARMRegisters::lr);
+        ret();
+    }
+
+    void callAbsolute(const void *funcPtr)
+    {
+        move(TrustedImmPtr(funcPtr), dataTempRegister);
+        call(dataTempRegister);
+    }
+
+    void pushAligned(RegisterID reg)
+    {
+        subPtr(TrustedImm32(PointerSize), StackPointerRegister);
+        push(reg);
+    }
+
+    void popAligned(RegisterID reg)
+    {
+        pop(reg);
+        addPtr(TrustedImm32(PointerSize), StackPointerRegister);
+    }
+};
+
+typedef PlatformAssembler_ARM32 PlatformAssemblerBase;
+
+#endif
+
+struct PlatformAssemblerCommon : PlatformAssemblerBase
 {
-    if (barrier)
-        *barrier = _function->argLocalRequiresWriteBarrier(al) ? WriteBarrier::Barrier : WriteBarrier::NoBarrier;
+    const Value* constantTable;
+    struct JumpTarget { JSC::MacroAssemblerBase::Jump jump; int offset; };
+    std::vector<JumpTarget> patches;
+    struct ExceptionHanlderTarget { JSC::MacroAssemblerBase::DataLabelPtr label; int offset; };
+    std::vector<ExceptionHanlderTarget> ehTargets;
+    QHash<int, JSC::MacroAssemblerBase::Label> labelsByOffset;
+    QHash<const void *, const char *> functions;
+    std::vector<Jump> catchyJumps;
+    Label functionExit;
+
+    Address exceptionHandlerAddress() const
+    {
+        return Address(FramePointerRegister, -1 * PointerSize);
+    }
 
-    int32_t offset = 0;
-    int scope = al->scope;
-    loadPtr(Address(EngineRegister, targetStructureOffset(offsetof(EngineBase, current))), baseReg);
+    Address contextAddress() const
+    {
+        return Address(JSStackFrameRegister, offsetof(CallData, context));
+    }
 
-    const qint32 outerOffset = targetStructureOffset(Heap::ExecutionContextData::baseOffset + offsetof(Heap::ExecutionContextData, outer));
-    const qint32 localsOffset = targetStructureOffset(Heap::CallContextData::baseOffset + offsetof(Heap::CallContextData, function))
-                                + 8 // locals is always 8 bytes away from function, regardless of pointer size.
-                                + offsetof(ValueArray<0>, values);
+    RegisterID registerForArg(int arg) const
+    {
+        Q_ASSERT(arg >= 0);
+        Q_ASSERT(arg < ArgInRegCount);
+        switch (arg) {
+        case 0: return Arg0Reg;
+        case 1: return Arg1Reg;
+        case 2: return Arg2Reg;
+        case 3: return Arg3Reg;
+        case 4: return Arg4Reg;
+        case 5: return Arg5Reg;
+        case 6: return Arg6Reg;
+        case 7: return Arg7Reg;
+        default:
+            Q_UNIMPLEMENTED();
+            Q_UNREACHABLE();
+        }
+    }
 
-    while (scope) {
-        loadPtr(Address(baseReg, outerOffset), baseReg);
-        --scope;
+    void callRuntime(const char *functionName, const void *funcPtr)
+    {
+        functions.insert(funcPtr, functionName);
+        callAbsolute(funcPtr);
     }
-    switch (al->kind) {
-    case IR::ArgLocal::Formal:
-    case IR::ArgLocal::ScopedFormal: {
-        if (barrier && *barrier == WriteBarrier::Barrier) {
-            // if we need a barrier, the baseReg has to point to the ExecutionContext
-            // callData comes directly after locals, calculate the offset using that
-            offset = localsOffset + _function->localsCountForScope(al) * sizeof(Value);
-            offset += sizeof(CallData) + (al->index - 1) * sizeof(Value);
-        } else {
-            const qint32 callDataOffset = targetStructureOffset(Heap::ExecutionContextData::baseOffset + offsetof(Heap::ExecutionContextData, callData));
-            loadPtr(Address(baseReg, callDataOffset), baseReg);
-            offset = sizeof(CallData) + (al->index - 1) * sizeof(Value);
+
+    Address loadFunctionPtr(RegisterID target)
+    {
+        Address addr(CppStackFrameRegister, offsetof(CppStackFrame, v4Function));
+        loadPtr(addr, target);
+        return Address(target);
+    }
+
+    Address loadCompilationUnitPtr(RegisterID target)
+    {
+        Address addr = loadFunctionPtr(target);
+        addr.offset = offsetof(QV4::Function, compilationUnit);
+        loadPtr(addr, target);
+        return Address(target);
+    }
+
+    Address loadConstAddress(int constIndex, RegisterID baseReg = ScratchRegister)
+    {
+        Address addr = loadCompilationUnitPtr(baseReg);
+        addr.offset = offsetof(QV4::CompiledData::CompilationUnitBase, constants);
+        loadPtr(addr, baseReg);
+        addr.offset = constIndex * int(sizeof(QV4::Value));
+        return addr;
+    }
+
+    Address loadStringAddress(int stringId)
+    {
+        Address addr = loadCompilationUnitPtr(ScratchRegister);
+        addr.offset = offsetof(QV4::CompiledData::CompilationUnitBase, runtimeStrings);
+        loadPtr(addr, ScratchRegister);
+        return Address(ScratchRegister, stringId * PointerSize);
+    }
+
+    void passAsArg(RegisterID src, int arg)
+    {
+        move(src, registerForArg(arg));
+    }
+
+    void generateCatchTrampoline(std::function<void()> loadUndefined)
+    {
+        for (Jump j : catchyJumps)
+            j.link(this);
+
+        loadPtr(exceptionHandlerAddress(), ScratchRegister);
+        Jump exitFunction = branchPtr(Equal, ScratchRegister, TrustedImmPtr(0));
+        jump(ScratchRegister);
+        exitFunction.link(this);
+        loadUndefined();
+
+        if (functionExit.isSet())
+            jump(functionExit);
+        else
+            generateFunctionExit();
+    }
+
+    void addCatchyJump(Jump j)
+    {
+        Q_ASSERT(j.isSet());
+        catchyJumps.push_back(j);
+    }
+
+    void generateFunctionEntry()
+    {
+        generatePlatformFunctionEntry();
+        loadPtr(Address(CppStackFrameRegister, offsetof(CppStackFrame, jsFrame)), JSStackFrameRegister);
+    }
+
+    void generateFunctionExit()
+    {
+        if (functionExit.isSet()) {
+            jump(functionExit);
+            return;
         }
-    } break;
-    case IR::ArgLocal::Local:
-    case IR::ArgLocal::ScopedLocal: {
-        offset = localsOffset + al->index * sizeof(Value);
-    } break;
-    default:
-        Q_UNREACHABLE();
+
+        functionExit = label();
+        generatePlatformFunctionExit();
     }
-    return Pointer(baseReg, offset);
-}
+};
 
-template <typename TargetConfiguration>
-typename Assembler<TargetConfiguration>::Pointer Assembler<TargetConfiguration>::loadStringAddress(RegisterID reg, const QString &string)
+#if QT_POINTER_SIZE == 8 || defined(ENABLE_ALL_ASSEMBLERS_FOR_REFACTORING_PURPOSES)
+struct PlatformAssembler64 : PlatformAssemblerCommon
 {
-    loadPtr(Address(Assembler::EngineRegister, targetStructureOffset(offsetof(QV4::EngineBase, current))), Assembler::ScratchRegister);
-    loadPtr(Address(Assembler::ScratchRegister, targetStructureOffset(Heap::ExecutionContextData::baseOffset + offsetof(Heap::ExecutionContextData, compilationUnit))), Assembler::ScratchRegister);
-    loadPtr(Address(Assembler::ScratchRegister, offsetof(CompiledData::CompilationUnitBase, runtimeStrings)), reg);
-    const int id = _jsGenerator->registerString(string);
-    return Pointer(reg, id * RegisterSize);
-}
+    void callRuntime(const char *functionName, const void *funcPtr,
+                     Assembler::CallResultDestination dest)
+    {
+        PlatformAssemblerCommon::callRuntime(functionName, funcPtr);
+        if (dest == Assembler::ResultInAccumulator)
+            move(ReturnValueRegister, AccumulatorRegister);
+    }
 
-template <typename TargetConfiguration>
-typename Assembler<TargetConfiguration>::Address Assembler<TargetConfiguration>::loadConstant(IR::Const *c, RegisterID baseReg)
-{
-    return loadConstant(convertToValue<TargetPrimitive>(c), baseReg);
-}
+    void loadUndefined(RegisterID dest = AccumulatorRegister)
+    {
+        move(TrustedImm64(0), dest);
+    }
 
-template <typename TargetConfiguration>
-typename Assembler<TargetConfiguration>::Address Assembler<TargetConfiguration>::loadConstant(const TargetPrimitive &v, RegisterID baseReg)
-{
-    loadPtr(Address(Assembler::EngineRegister, targetStructureOffset(offsetof(QV4::EngineBase, current))), baseReg);
-    loadPtr(Address(baseReg, targetStructureOffset(Heap::ExecutionContextData::baseOffset + offsetof(Heap::ExecutionContextData, constantTable))), baseReg);
-    const int index = _jsGenerator->registerConstant(v.rawValue());
-    return Address(baseReg, index * sizeof(QV4::Value));
-}
+    void copyConst(int constIndex, Address dest)
+    {
+        //###
+        if (constantTable[constIndex].isUndefined()) {
+            loadUndefined(ScratchRegister);
+        } else {
+            load64(loadConstAddress(constIndex, ScratchRegister), ScratchRegister);
+        }
+        store64(ScratchRegister, dest);
+    }
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::loadStringRef(RegisterID reg, const QString &string)
-{
-    const int id = _jsGenerator->registerString(string);
-    move(TrustedImm32(id), reg);
-}
+    void copyReg(Address src, Address dst)
+    {
+        loadReg(src, ScratchRegister);
+        store64(ScratchRegister, dst);
+    }
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::storeValue(TargetPrimitive value, IR::Expr *destination)
-{
-    WriteBarrier::Type barrier;
-    Address addr = loadAddressForWriting(ScratchRegister, destination, &barrier);
-    storeValue(value, addr, barrier);
-}
+    void loadReg(Address addr, RegisterID dest = AccumulatorRegister)
+    {
+        load64(addr, dest);
+    }
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::enterStandardStackFrame(const RegisterInformation &regularRegistersToSave,
-                                        const RegisterInformation &fpRegistersToSave)
-{
-    platformEnterStandardStackFrame(this);
+    void loadAccumulator(Address addr)
+    {
+        load64(addr, AccumulatorRegister);
+    }
 
-    move(StackPointerRegister, JITTargetPlatform::FramePointerRegister);
+    void storeAccumulator(Address addr)
+    {
+        store64(AccumulatorRegister, addr);
+    }
 
-    const int frameSize = _stackLayout->calculateStackFrameSize();
-    subPtr(TrustedImm32(frameSize), StackPointerRegister);
+    void loadString(int stringId)
+    {
+        loadAccumulator(loadStringAddress(stringId));
+    }
 
-    Address slotAddr(JITTargetPlatform::FramePointerRegister, 0);
-    for (int i = 0, ei = fpRegistersToSave.size(); i < ei; ++i) {
-        Q_ASSERT(fpRegistersToSave.at(i).isFloatingPoint());
-        slotAddr.offset -= sizeof(double);
-        TargetConfiguration::MacroAssembler::storeDouble(fpRegistersToSave.at(i).reg<FPRegisterID>(), slotAddr);
+    void loadValue(ReturnedValue value)
+    {
+        move(TrustedImm64(value), AccumulatorRegister);
     }
-    for (int i = 0, ei = regularRegistersToSave.size(); i < ei; ++i) {
-        Q_ASSERT(regularRegistersToSave.at(i).isRegularRegister());
-        slotAddr.offset -= RegisterSize;
-        storePtr(regularRegistersToSave.at(i).reg<RegisterID>(), slotAddr);
+
+    void generateCatchTrampoline()
+    {
+        PlatformAssemblerCommon::generateCatchTrampoline([this](){loadUndefined();});
     }
 
-    platformFinishEnteringStandardStackFrame(this);
-}
+    void toBoolean(std::function<void(RegisterID)> continuation)
+    {
+        urshift64(AccumulatorRegister, TrustedImm32(Value::IsIntegerConvertible_Shift), ScratchRegister);
+        auto needsConversion = branch32(NotEqual, TrustedImm32(1), ScratchRegister);
+        continuation(AccumulatorRegister);
+        Jump done = jump();
+
+        // slow path:
+        needsConversion.link(this);
+        push(AccumulatorRegister);
+        move(AccumulatorRegister, registerForArg(0));
+        callHelper(Value::toBooleanImpl);
+        and32(TrustedImm32(1), ReturnValueRegister, ScratchRegister);
+        pop(AccumulatorRegister);
+        continuation(ScratchRegister);
+
+        done.link(this);
+    }
 
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::leaveStandardStackFrame(const RegisterInformation &regularRegistersToSave,
-                                        const RegisterInformation &fpRegistersToSave)
-{
-    Address slotAddr(JITTargetPlatform::FramePointerRegister, -regularRegistersToSave.size() * RegisterSize - fpRegistersToSave.size() * sizeof(double));
+    void toNumber()
+    {
+        move(AccumulatorRegister, registerForArg(0));
+        callHelper(toNumberHelper);
+        move(ReturnValueRegister, AccumulatorRegister);
+    }
 
-    // restore the callee saved registers
-    for (int i = regularRegistersToSave.size() - 1; i >= 0; --i) {
-        Q_ASSERT(regularRegistersToSave.at(i).isRegularRegister());
-        loadPtr(slotAddr, regularRegistersToSave.at(i).reg<RegisterID>());
-        slotAddr.offset += RegisterSize;
+    void toInt32()
+    {
+        move(AccumulatorRegister, registerForArg(0));
+        callRuntime("toInt32Helper", reinterpret_cast<void *>(&toInt32Helper),
+                    Assembler::ResultInAccumulator);
     }
-    for (int i = fpRegistersToSave.size() - 1; i >= 0; --i) {
-        Q_ASSERT(fpRegistersToSave.at(i).isFloatingPoint());
-        TargetConfiguration::MacroAssembler::loadDouble(slotAddr, fpRegistersToSave.at(i).reg<FPRegisterID>());
-        slotAddr.offset += sizeof(double);
+
+    void regToInt32(Address srcReg, RegisterID targetReg)
+    {
+        pushAligned(AccumulatorRegister);
+        load64(srcReg, registerForArg(0));
+        callHelper(toInt32Helper);
+        move(ReturnValueRegister, targetReg);
+        popAligned(AccumulatorRegister);
     }
 
-    Q_ASSERT(slotAddr.offset == 0);
+    void isNullOrUndefined()
+    {
+        move(AccumulatorRegister, ScratchRegister);
+        compare64(Equal, ScratchRegister, TrustedImm32(0), AccumulatorRegister);
+        Jump isUndef = branch32(NotEqual, TrustedImm32(0), AccumulatorRegister);
 
-    const int frameSize = _stackLayout->calculateStackFrameSize();
-    platformLeaveStandardStackFrame(this, frameSize);
-}
+        // not undefined
+        rshift64(TrustedImm32(32), ScratchRegister);
+        compare32(Equal, ScratchRegister, TrustedImm32(int(QV4::Value::ValueTypeInternal::Null)),
+                  AccumulatorRegister);
 
+        isUndef.link(this);
+    }
 
+    void jumpStrictEqualStackSlotInt(int lhs, int rhs, int offset)
+    {
+        Address lhsAddr(JSStackFrameRegister, lhs * int(sizeof(Value)));
+        load64(lhsAddr, ScratchRegister);
+        Jump isUndef = branch64(Equal, ScratchRegister, TrustedImm64(0));
+        Jump equal = branch32(Equal, TrustedImm32(rhs), ScratchRegister);
+        patches.push_back({ equal, offset });
+        isUndef.link(this);
+    }
 
+    void jumpStrictNotEqualStackSlotInt(int lhs, int rhs, int offset)
+    {
+        Address lhsAddr(JSStackFrameRegister, lhs * int(sizeof(Value)));
+        load64(lhsAddr, ScratchRegister);
+        Jump isUndef = branch64(Equal, ScratchRegister, TrustedImm64(0));
+        patches.push_back({ isUndef, offset });
+        Jump notEqual = branch32(NotEqual, TrustedImm32(rhs), ScratchRegister);
+        patches.push_back({ notEqual, offset });
+    }
 
-// Try to load the source expression into the destination FP register. This assumes that two
-// general purpose (integer) registers are available: the ScratchRegister and the
-// ReturnValueRegister. It returns a Jump if no conversion can be performed.
-template <typename TargetConfiguration>
-typename Assembler<TargetConfiguration>::Jump Assembler<TargetConfiguration>::genTryDoubleConversion(IR::Expr *src, FPRegisterID dest)
-{
-    switch (src->type) {
-    case IR::DoubleType:
-        moveDouble(toDoubleRegister(src, dest), dest);
-        return Assembler::Jump();
-    case IR::SInt32Type:
-        convertInt32ToDouble(toInt32Register(src, Assembler::ScratchRegister),
-                                  dest);
-        return Assembler::Jump();
-    case IR::UInt32Type:
-        convertUInt32ToDouble(toUInt32Register(src, Assembler::ScratchRegister),
-                                   dest, Assembler::ReturnValueRegister);
-        return Assembler::Jump();
-    case IR::NullType:
-    case IR::UndefinedType:
-    case IR::BoolType:
-        // TODO?
-    case IR::StringType:
-        return jump();
-    default:
-        break;
+    void setAccumulatorTag(QV4::Value::ValueTypeInternal tag, RegisterID sourceReg = NoRegister)
+    {
+        if (sourceReg == NoRegister)
+            or64(TrustedImm64(int64_t(tag) << 32), AccumulatorRegister);
+        else
+            or64(TrustedImm64(int64_t(tag) << 32), sourceReg, AccumulatorRegister);
     }
 
-    Q_ASSERT(src->asTemp() || src->asArgLocal());
+    void encodeDoubleIntoAccumulator(FPRegisterID src)
+    {
+        moveDoubleTo64(src, AccumulatorRegister);
+        move(TrustedImm64(Value::NaNEncodeMask), ScratchRegister);
+        xor64(ScratchRegister, AccumulatorRegister);
+    }
 
-    // It's not a number type, so it cannot be in a register.
-    Q_ASSERT(src->asArgLocal() || src->asTemp()->kind != IR::Temp::PhysicalRegister || src->type == IR::BoolType);
+    void pushValue(ReturnedValue v)
+    {
+        loadValue(v);
+        push(AccumulatorRegister);
+    }
 
-    Assembler::Pointer tagAddr = loadAddressForReading(Assembler::ScratchRegister, src);
-    tagAddr.offset += 4;
-    load32(tagAddr, Assembler::ScratchRegister);
+    void pushValueAligned(ReturnedValue v)
+    {
+        subPtr(TrustedImm32(PointerSize), StackPointerRegister);
+        pushValue(v);
+    }
 
-    // check if it's an int32:
-    Assembler::Jump isNoInt = branch32(Assembler::NotEqual, Assembler::ScratchRegister,
-                                       Assembler::TrustedImm32(quint32(ValueTypeInternal::Integer)));
-    convertInt32ToDouble(toInt32Register(src, Assembler::ScratchRegister), dest);
-    Assembler::Jump intDone = jump();
+    void popValueAligned()
+    {
+        addPtr(TrustedImm32(2 * PointerSize), StackPointerRegister);
+    }
 
-    // not an int, check if it's a double:
-    isNoInt.link(this);
-    Assembler::Jump isNoDbl = RegisterSizeDependentOps::checkIfTagRegisterIsDouble(this, ScratchRegister);
-    toDoubleRegister(src, dest);
-    intDone.link(this);
+    Jump binopBothIntPath(Address lhsAddr, std::function<Jump(void)> fastPath)
+    {
+        urshift64(AccumulatorRegister, TrustedImm32(32), ScratchRegister);
+        Jump accNotInt = branch32(NotEqual, TrustedImm32(int(IntegerTag)), ScratchRegister);
+        load64(lhsAddr, ScratchRegister);
+        urshift64(ScratchRegister, TrustedImm32(32), ScratchRegister2);
+        Jump lhsNotInt = branch32(NotEqual, TrustedImm32(int(IntegerTag)), ScratchRegister2);
+
+        // both integer
+        Jump failure = fastPath();
+        Jump done = jump();
+
+        // all other cases
+        if (failure.isSet())
+            failure.link(this);
+        accNotInt.link(this);
+        lhsNotInt.link(this);
+
+        return done;
+    }
+};
 
-    return isNoDbl;
-}
+typedef PlatformAssembler64 PlatformAssembler;
+#endif
 
-template <typename TargetConfiguration>
-typename Assembler<TargetConfiguration>::Jump Assembler<TargetConfiguration>::branchDouble(bool invertCondition, IR::AluOp op,
-                                                   IR::Expr *left, IR::Expr *right)
+#if QT_POINTER_SIZE == 4 || defined(ENABLE_ALL_ASSEMBLERS_FOR_REFACTORING_PURPOSES)
+struct PlatformAssembler32 : PlatformAssemblerCommon
 {
-    DoubleCondition cond;
-    switch (op) {
-    case IR::OpGt: cond = Assembler::DoubleGreaterThan; break;
-    case IR::OpLt: cond = Assembler::DoubleLessThan; break;
-    case IR::OpGe: cond = Assembler::DoubleGreaterThanOrEqual; break;
-    case IR::OpLe: cond = Assembler::DoubleLessThanOrEqual; break;
-    case IR::OpEqual:
-    case IR::OpStrictEqual: cond = Assembler::DoubleEqual; break;
-    case IR::OpNotEqual:
-    case IR::OpStrictNotEqual: cond = Assembler::DoubleNotEqualOrUnordered; break; // No, the inversion of DoubleEqual is NOT DoubleNotEqual.
-    default:
-        Q_UNREACHABLE();
+    void callRuntime(const char *functionName, const void *funcPtr,
+                     Assembler::CallResultDestination dest)
+    {
+        PlatformAssemblerCommon::callRuntime(functionName, funcPtr);
+        if (dest == Assembler::ResultInAccumulator) {
+            move(ReturnValueRegisterValue, AccumulatorRegisterValue);
+            move(ReturnValueRegisterTag, AccumulatorRegisterTag);
+        }
     }
-    if (invertCondition)
-        cond = TargetConfiguration::MacroAssembler::invert(cond);
 
-    return TargetConfiguration::MacroAssembler::branchDouble(cond, toDoubleRegister(left, FPGpr0), toDoubleRegister(right, JITTargetPlatform::FPGpr1));
-}
+    void loadUndefined()
+    {
+        move(TrustedImm32(0), AccumulatorRegisterValue);
+        move(TrustedImm32(0), AccumulatorRegisterTag);
+    }
 
-template <typename TargetConfiguration>
-typename Assembler<TargetConfiguration>::Jump Assembler<TargetConfiguration>::branchInt32(bool invertCondition, IR::AluOp op, IR::Expr *left, IR::Expr *right)
-{
-    Assembler::RelationalCondition cond;
-    switch (op) {
-    case IR::OpGt: cond = Assembler::GreaterThan; break;
-    case IR::OpLt: cond = Assembler::LessThan; break;
-    case IR::OpGe: cond = Assembler::GreaterThanOrEqual; break;
-    case IR::OpLe: cond = Assembler::LessThanOrEqual; break;
-    case IR::OpEqual:
-    case IR::OpStrictEqual: cond = Assembler::Equal; break;
-    case IR::OpNotEqual:
-    case IR::OpStrictNotEqual: cond = Assembler::NotEqual; break;
-    default:
-        Q_UNREACHABLE();
+    void copyConst(int constIndex, Address destRegAddr)
+    {
+        //###
+        if (constantTable[constIndex].isUndefined()) {
+            move(TrustedImm32(0), ScratchRegister);
+            store32(ScratchRegister, destRegAddr);
+            destRegAddr.offset += 4;
+            store32(ScratchRegister, destRegAddr);
+        } else {
+            Address src = loadConstAddress(constIndex);
+            loadDouble(src, FPScratchRegister);
+            storeDouble(FPScratchRegister, destRegAddr);
+        }
     }
-    if (invertCondition)
-        cond = TargetConfiguration::MacroAssembler::invert(cond);
-
-    return TargetConfiguration::MacroAssembler::branch32(cond,
-                                                         toInt32Register(left, Assembler::ScratchRegister),
-                                                         toInt32Register(right, Assembler::ReturnValueRegister));
-}
-
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::setStackLayout(int maxArgCountForBuiltins, int regularRegistersToSave, int fpRegistersToSave)
-{
-    _stackLayout.reset(new StackLayout(_function, maxArgCountForBuiltins, regularRegistersToSave, fpRegistersToSave));
-}
-
-template <typename TargetConfiguration>
-void Assembler<TargetConfiguration>::returnFromFunction(IR::Ret *s, RegisterInformation regularRegistersToSave, RegisterInformation fpRegistersToSave)
-{
-    if (!s) {
-        // this only happens if the method doesn't have a return statement and can
-        // only exit through an exception
-    } else if (IR::Temp *t = s->expr->asTemp()) {
-        RegisterSizeDependentOps::setFunctionReturnValueFromTemp(this, t);
-    } else if (IR::Const *c = s->expr->asConst()) {
-        auto retVal = convertToValue<TargetPrimitive>(c);
-        RegisterSizeDependentOps::setFunctionReturnValueFromConst(this, retVal);
-    } else {
-        Q_UNREACHABLE();
-        Q_UNUSED(s);
+
+    void copyReg(Address src, Address dest)
+    {
+        loadDouble(src, FPScratchRegister);
+        storeDouble(FPScratchRegister, dest);
+    }
+
+    void loadReg(Address addr)
+    {
+        load32(addr, AccumulatorRegisterValue);
+        addr.offset += 4;
+        load32(addr, AccumulatorRegisterTag);
+    }
+
+    void loadAccumulator(Address src)
+    {
+        load32(src, AccumulatorRegisterValue);
+        src.offset += 4;
+        load32(src, AccumulatorRegisterTag);
+    }
+
+    void storeAccumulator(Address addr)
+    {
+        store32(AccumulatorRegisterValue, addr);
+        addr.offset += 4;
+        store32(AccumulatorRegisterTag, addr);
+    }
+
+    void loadString(int stringId)
+    {
+        load32(loadStringAddress(stringId), AccumulatorRegisterValue);
+        move(TrustedImm32(0), AccumulatorRegisterTag);
+    }
+
+    void loadValue(ReturnedValue value)
+    {
+        move(TrustedImm32(Value::fromReturnedValue(value).value()), AccumulatorRegisterValue);
+        move(TrustedImm32(Value::fromReturnedValue(value).tag()), AccumulatorRegisterTag);
+    }
+
+    void generateCatchTrampoline()
+    {
+        PlatformAssemblerCommon::generateCatchTrampoline([this](){loadUndefined();});
+    }
+
+    void toNumber()
+    {
+        if (ArgInRegCount < 2) {
+            push(AccumulatorRegisterTag);
+            push(AccumulatorRegisterValue);
+        } else {
+            move(AccumulatorRegisterValue, registerForArg(0));
+            move(AccumulatorRegisterTag, registerForArg(1));
+        }
+        callRuntime("toNumberHelper", reinterpret_cast<void *>(&toNumberHelper),
+                    Assembler::ResultInAccumulator);
+        move(ReturnValueRegisterValue, AccumulatorRegisterValue);
+        move(ReturnValueRegisterTag, AccumulatorRegisterTag);
+        if (ArgInRegCount < 2)
+            addPtr(TrustedImm32(2 * PointerSize), StackPointerRegister);
+    }
+
+    void toInt32()
+    {
+        if (ArgInRegCount < 2) {
+            push(AccumulatorRegisterTag);
+            push(AccumulatorRegisterValue);
+        } else {
+            move(AccumulatorRegisterValue, registerForArg(0));
+            move(AccumulatorRegisterTag, registerForArg(1));
+        }
+        callRuntime("toInt32Helper", reinterpret_cast<void *>(&toInt32Helper),
+                    Assembler::ResultInAccumulator);
+        if (ArgInRegCount < 2)
+            addPtr(TrustedImm32(2 * PointerSize), StackPointerRegister);
+    }
+
+    void regToInt32(Address srcReg, RegisterID targetReg)
+    {
+        bool accumulatorNeedsSaving = AccumulatorRegisterValue == ReturnValueRegisterValue
+                || AccumulatorRegisterTag == ReturnValueRegisterTag;
+        if (accumulatorNeedsSaving) {
+            push(AccumulatorRegisterTag);
+            push(AccumulatorRegisterValue);
+        }
+        if (ArgInRegCount < 2) {
+            srcReg.offset += 4;
+            load32(srcReg, targetReg);
+            push(targetReg);
+            srcReg.offset -= 4;
+            load32(srcReg, targetReg);
+            push(targetReg);
+        } else {
+            load32(srcReg, registerForArg(0));
+            srcReg.offset += 4;
+            load32(srcReg, registerForArg(1));
+        }
+        callHelper(toInt32Helper);
+        move(ReturnValueRegisterValue, targetReg);
+        if (ArgInRegCount < 2)
+            addPtr(TrustedImm32(2 * PointerSize), StackPointerRegister);
+        if (accumulatorNeedsSaving) {
+            pop(AccumulatorRegisterValue);
+            pop(AccumulatorRegisterTag);
+        }
+    }
+
+    void isNullOrUndefined()
+    {
+        Jump notUndefOrPtr = branch32(NotEqual, TrustedImm32(0), AccumulatorRegisterTag);
+        compare32(Equal, AccumulatorRegisterValue, TrustedImm32(0), AccumulatorRegisterValue);
+        auto done = jump();
+
+        // not undefined or managed
+        notUndefOrPtr.link(this);
+        compare32(Equal, AccumulatorRegisterTag, TrustedImm32(int(QV4::Value::ValueTypeInternal::Null)),
+                  AccumulatorRegisterValue);
+
+        done.link(this);
+    }
+
+    void pushValue(ReturnedValue v)
+    {
+        push(TrustedImm32(v >> 32));
+        push(TrustedImm32(v));
+    }
+
+    void toBoolean(std::function<void(RegisterID)> continuation)
+    {
+        urshift32(AccumulatorRegisterTag, TrustedImm32(Value::IsIntegerConvertible_Shift - 32),
+                  ScratchRegister);
+        auto needsConversion = branch32(NotEqual, TrustedImm32(1), ScratchRegister);
+        continuation(AccumulatorRegisterValue);
+        Jump done = jump();
+
+        // slow path:
+        needsConversion.link(this);
+
+        bool accumulatorNeedsSaving = AccumulatorRegisterValue == ReturnValueRegisterValue
+                || AccumulatorRegisterTag == ReturnValueRegisterTag;
+        if (accumulatorNeedsSaving) {
+            push(AccumulatorRegisterTag);
+            push(AccumulatorRegisterValue);
+        }
+
+        if (ArgInRegCount < 2) {
+            push(AccumulatorRegisterTag);
+            push(AccumulatorRegisterValue);
+        } else {
+            move(AccumulatorRegisterValue, registerForArg(0));
+            move(AccumulatorRegisterTag, registerForArg(1));
+        }
+        callHelper(Value::toBooleanImpl);
+        if (ArgInRegCount < 2)
+            addPtr(TrustedImm32(2 * PointerSize), StackPointerRegister);
+
+        and32(TrustedImm32(1), ReturnValueRegisterValue, ScratchRegister);
+        if (accumulatorNeedsSaving) {
+            pop(AccumulatorRegisterValue);
+            pop(AccumulatorRegisterTag);
+        }
+        continuation(ScratchRegister);
+
+        done.link(this);
+    }
+
+    void jumpStrictEqualStackSlotInt(int lhs, int rhs, int offset)
+    {
+        Address lhsAddr(JSStackFrameRegister, lhs * int(sizeof(Value)));
+        load32(lhsAddr, ScratchRegister);
+        Jump notEqInt = branch32(NotEqual, ScratchRegister, TrustedImm32(rhs));
+        Jump notEqUndefVal = branch32(NotEqual, ScratchRegister, TrustedImm32(0));
+        patches.push_back({ notEqUndefVal, offset });
+        lhsAddr.offset += 4;
+        load32(lhsAddr, ScratchRegister);
+        Jump notEqUndefTag = branch32(NotEqual, ScratchRegister, TrustedImm32(0));
+        patches.push_back({ notEqUndefTag, offset });
+        notEqInt.link(this);
+    }
+
+    void jumpStrictNotEqualStackSlotInt(int lhs, int rhs, int offset)
+    {
+        Address lhsAddr(JSStackFrameRegister, lhs * int(sizeof(Value)));
+        load32(lhsAddr, ScratchRegister);
+        Jump notEqual = branch32(NotEqual, TrustedImm32(rhs), ScratchRegister);
+        patches.push_back({ notEqual, offset });
+        Jump notUndefValue = branch32(NotEqual, TrustedImm32(0), ScratchRegister);
+        lhsAddr.offset += 4;
+        load32(lhsAddr, ScratchRegister);
+        Jump equalUndef = branch32(Equal, TrustedImm32(0), ScratchRegister);
+        patches.push_back({ equalUndef, offset });
+        notUndefValue.link(this);
+    }
+
+    void setAccumulatorTag(QV4::Value::ValueTypeInternal tag, RegisterID sourceReg = NoRegister)
+    {
+        if (sourceReg != NoRegister)
+            move(sourceReg, AccumulatorRegisterValue);
+        move(TrustedImm32(int(tag)), AccumulatorRegisterTag);
+    }
+
+    void encodeDoubleIntoAccumulator(FPRegisterID src)
+    {
+        moveDoubleToInts(src, AccumulatorRegisterValue, AccumulatorRegisterTag);
+        xor32(TrustedImm32(Value::NaNEncodeMask >> 32), AccumulatorRegisterTag);
+    }
+
+    void pushValueAligned(ReturnedValue v)
+    {
+        pushValue(v);
     }
 
-    Label leaveStackFrame = label();
+    void popValueAligned()
+    {
+        popValue();
+    }
+
+    Jump binopBothIntPath(Address lhsAddr, std::function<Jump(void)> fastPath)
+    {
+        Jump accNotInt = branch32(NotEqual, TrustedImm32(int(IntegerTag)), AccumulatorRegisterTag);
+        Address lhsAddrTag = lhsAddr; lhsAddrTag.offset += Value::tagOffset();
+        load32(lhsAddrTag, ScratchRegister);
+        Jump lhsNotInt = branch32(NotEqual, TrustedImm32(int(IntegerTag)), ScratchRegister);
+
+        // both integer
+        Address lhsAddrValue = lhsAddr; lhsAddrValue.offset += Value::valueOffset();
+        load32(lhsAddrValue, ScratchRegister);
+        Jump failure = fastPath();
+        Jump done = jump();
+
+        // all other cases
+        if (failure.isSet())
+            failure.link(this);
+        accNotInt.link(this);
+        lhsNotInt.link(this);
+
+        return done;
+    }
+};
+
+typedef PlatformAssembler32 PlatformAssembler;
+#endif
+
+typedef PlatformAssembler::TrustedImmPtr TrustedImmPtr;
+typedef PlatformAssembler::TrustedImm32 TrustedImm32;
+typedef PlatformAssembler::TrustedImm64 TrustedImm64;
+typedef PlatformAssembler::Address Address;
+typedef PlatformAssembler::RegisterID RegisterID;
+typedef PlatformAssembler::FPRegisterID FPRegisterID;
 
-    const int locals = stackLayout().calculateJSStackFrameSize();
-    subPtr(TrustedImm32(sizeof(QV4::Value)*locals), JITTargetPlatform::LocalsRegister);
-    storePtr(JITTargetPlatform::LocalsRegister, Address(JITTargetPlatform::EngineRegister, targetStructureOffset(offsetof(EngineBase, jsStackTop))));
+#define pasm() reinterpret_cast<PlatformAssembler *>(this->d)
 
-    leaveStandardStackFrame(regularRegistersToSave, fpRegistersToSave);
-    ret();
+static Address regAddr(int reg)
+{
+    return Address(PlatformAssembler::JSStackFrameRegister, reg * int(sizeof(QV4::Value)));
+}
+
+Assembler::Assembler(const Value *constantTable)
+    : d(new PlatformAssembler)
+{
+    pasm()->constantTable = constantTable;
+}
 
-    exceptionReturnLabel = label();
-    auto retVal = TargetPrimitive::undefinedValue();
-    RegisterSizeDependentOps::setFunctionReturnValueFromConst(this, retVal);
-    jump(leaveStackFrame);
+Assembler::~Assembler()
+{
+    delete pasm();
+}
+
+void Assembler::generatePrologue()
+{
+    pasm()->generateFunctionEntry();
+}
+
+void Assembler::generateEpilogue()
+{
+    pasm()->generateCatchTrampoline();
 }
 
 namespace {
@@ -560,7 +1155,7 @@ public:
     ~QIODevicePrintStream()
     {}
 
-    void vprintf(const char* format, va_list argList) override WTF_ATTRIBUTE_PRINTF(2, 0)
+    void vprintf(const char* format, va_list argList) WTF_ATTRIBUTE_PRINTF(2, 0)
     {
         const int written = qvsnprintf(buf.data(), buf.size(), format, argList);
         if (written > 0)
@@ -568,7 +1163,7 @@ public:
         memset(buf.data(), 0, qMin(written, buf.size()));
     }
 
-    void flush() override
+    void flush()
     {}
 
 private:
@@ -577,150 +1172,792 @@ private:
 };
 } // anonymous namespace
 
-static void printDisassembledOutputWithCalls(QByteArray processedOutput, const QHash<void*, const char*>& functions)
+static void printDisassembledOutputWithCalls(QByteArray processedOutput,
+                                             const QHash<const void*, const char*>& functions)
 {
-    for (QHash<void*, const char*>::ConstIterator it = functions.begin(), end = functions.end();
+    for (QHash<const void*, const char*>::ConstIterator it = functions.begin(), end = functions.end();
          it != end; ++it) {
         const QByteArray ptrString = "0x" + QByteArray::number(quintptr(it.key()), 16);
-        int idx = processedOutput.indexOf(ptrString);
-        if (idx < 0)
-            continue;
-        idx = processedOutput.lastIndexOf('\n', idx);
-        if (idx < 0)
-            continue;
-        processedOutput = processedOutput.insert(idx, QByteArrayLiteral("                          ; call ") + it.value());
+        int idx = 0;
+        while (idx >= 0) {
+            idx = processedOutput.indexOf(ptrString, idx);
+            if (idx < 0)
+                break;
+            idx = processedOutput.indexOf('\n', idx);
+            if (idx < 0)
+                break;
+            processedOutput = processedOutput.insert(idx, QByteArrayLiteral("                          ; ") + it.value());
+        }
     }
 
     qDebug("%s", processedOutput.constData());
 }
 
-#if defined(Q_OS_LINUX)
-static FILE *pmap;
+void Assembler::link(Function *function)
+{
+    for (const auto &jumpTarget : pasm()->patches)
+        jumpTarget.jump.linkTo(pasm()->labelsByOffset[jumpTarget.offset], pasm());
+
+    JSC::JSGlobalData dummy(function->internalClass->engine->executableAllocator);
+    JSC::LinkBuffer<PlatformAssembler::MacroAssembler> linkBuffer(dummy, pasm(), 0);
+
+    for (const auto &ehTarget : pasm()->ehTargets) {
+        auto targetLabel = pasm()->labelsByOffset.value(ehTarget.offset);
+        linkBuffer.patch(ehTarget.label, linkBuffer.locationOf(targetLabel));
+    }
+
+    JSC::MacroAssemblerCodeRef codeRef;
+
+    static const bool showCode = qEnvironmentVariableIsSet("QV4_SHOW_ASM");
+    if (showCode) {
+        QBuffer buf;
+        buf.open(QIODevice::WriteOnly);
+        WTF::setDataFile(new QIODevicePrintStream(&buf));
+
+        QByteArray name = function->name()->toQString().toUtf8();
+        if (name.isEmpty()) {
+            name = QByteArray::number(quintptr(function), 16);
+            name.prepend("QV4::Function(0x");
+            name.append(')');
+        }
+        codeRef = linkBuffer.finalizeCodeWithDisassembly("%s", name.data());
+
+        WTF::setDataFile(stderr);
+        printDisassembledOutputWithCalls(buf.data(), pasm()->functions);
+    } else {
+        codeRef = linkBuffer.finalizeCodeWithoutDisassembly();
+    }
+
+    function->codeRef = new JSC::MacroAssemblerCodeRef(codeRef);
+    function->jittedCode = reinterpret_cast<Function::JittedCode>(function->codeRef->code().executableAddress());
+}
+
+void Assembler::addLabel(int offset)
+{
+    pasm()->labelsByOffset[offset] = pasm()->label();
+}
 
-static void qt_closePmap()
+void Assembler::loadConst(int constIndex)
 {
-    if (pmap) {
-        fclose(pmap);
-        pmap = 0;
+    //###
+    if (pasm()->constantTable[constIndex].isUndefined()) {
+        pasm()->loadUndefined();
+    } else {
+        pasm()->loadAccumulator(pasm()->loadConstAddress(constIndex));
     }
 }
 
-#endif
+void Assembler::copyConst(int constIndex, int destReg)
+{
+    pasm()->copyConst(constIndex, regAddr(destReg));
+}
 
-template <typename TargetConfiguration>
-JSC::MacroAssemblerCodeRef Assembler<TargetConfiguration>::link(int *codeSize)
+void Assembler::loadReg(int reg)
 {
-    Label endOfCode = label();
+    pasm()->loadReg(regAddr(reg));
+}
 
-    {
-        for (size_t i = 0, ei = _patches.size(); i != ei; ++i) {
-            Label target = _addrs.at(i);
-            Q_ASSERT(target.isSet());
-            for (Jump jump : qAsConst(_patches.at(i)))
-                jump.linkTo(target, this);
-        }
-    }
+void Assembler::storeReg(int reg)
+{
+    pasm()->storeAccumulator(regAddr(reg));
+}
 
-    JSC::JSGlobalData dummy(_executableAllocator);
-    JSC::LinkBuffer<typename TargetConfiguration::MacroAssembler> linkBuffer(dummy, this, 0);
+void Assembler::loadString(int stringId)
+{
+    pasm()->loadString(stringId);
+}
 
-    for (const DataLabelPatch &p : qAsConst(_dataLabelPatches))
-        linkBuffer.patch(p.dataLabel, linkBuffer.locationOf(p.target));
+void Assembler::loadValue(ReturnedValue value)
+{
+    pasm()->loadValue(value);
+}
 
-    // link exception handlers
-    for (Jump jump : qAsConst(exceptionPropagationJumps))
-        linkBuffer.link(jump, linkBuffer.locationOf(exceptionReturnLabel));
+void Assembler::toNumber()
+{
+    pasm()->toNumber();
+}
 
-    {
-        for (size_t i = 0, ei = _labelPatches.size(); i != ei; ++i) {
-            Label target = _addrs.at(i);
-            Q_ASSERT(target.isSet());
-            for (DataLabelPtr label : _labelPatches.at(i))
-                linkBuffer.patch(label, linkBuffer.locationOf(target));
-        }
-    }
+void Assembler::uminus()
+{
+    saveAccumulatorInFrame();
+    prepareCallWithArgCount(1);
+    passAccumulatorAsArg(0);
+    IN_JIT_GENERATE_RUNTIME_CALL(Runtime::method_uMinus, ResultInAccumulator);
+    checkException();
+}
 
-    *codeSize = linkBuffer.offsetOf(endOfCode);
+void Assembler::ucompl()
+{
+    pasm()->toInt32();
+    pasm()->xor32(TrustedImm32(-1), PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(IntegerTag);
+}
 
-    QByteArray name;
+static ReturnedValue incHelper(const Value &v)
+{
+    return Encode(v.toNumber() + 1.);
+}
 
-    JSC::MacroAssemblerCodeRef codeRef;
+void Assembler::inc()
+{
+//    auto done = pasm()->incFastPath();
 
-    static const bool showCode = qEnvironmentVariableIsSet("QV4_SHOW_ASM");
-    if (showCode) {
-        QHash<void*, const char*> functions;
+    // slow path:
+    saveAccumulatorInFrame();
+    prepareCallWithArgCount(1);
+    passAccumulatorAsArg(0);
+    IN_JIT_GENERATE_RUNTIME_CALL(incHelper, ResultInAccumulator);
+    checkException();
+
+    // done.
+//    done.link(pasm());
+}
+
+static ReturnedValue decHelper(const Value &v)
+{
+    return Encode(v.toNumber() - 1.);
+}
+
+void Assembler::dec()
+{
+//    auto done = pasm()->decFastPath();
+
+    // slow path:
+    saveAccumulatorInFrame();
+    prepareCallWithArgCount(1);
+    passAccumulatorAsArg(0);
+    IN_JIT_GENERATE_RUNTIME_CALL(decHelper, ResultInAccumulator);
+    checkException();
+
+    // done.
+//    done.link(pasm());
+}
+
+void Assembler::unot()
+{
+    pasm()->toBoolean([this](PlatformAssembler::RegisterID resultReg){
+        pasm()->compare32(PlatformAssembler::Equal, resultReg,
+                          TrustedImm32(0), PlatformAssembler::AccumulatorRegisterValue);
+        pasm()->setAccumulatorTag(QV4::Value::ValueTypeInternal::Boolean);
+    });
+}
+
+void Assembler::add(int lhs)
+{
+    auto done = pasm()->binopBothIntPath(regAddr(lhs), [this](){
+        auto overflowed = pasm()->branchAdd32(PlatformAssembler::Overflow,
+                                              PlatformAssembler::AccumulatorRegisterValue,
+                                              PlatformAssembler::ScratchRegister);
+        pasm()->setAccumulatorTag(IntegerTag,
+                                  PlatformAssembler::ScratchRegister);
+        return overflowed;
+    });
+
+    // slow path:
+    saveAccumulatorInFrame();
+    prepareCallWithArgCount(3);
+    passAccumulatorAsArg(2);
+    passRegAsArg(lhs, 1);
+    passEngineAsArg(0);
+    IN_JIT_GENERATE_RUNTIME_CALL(Runtime::method_add, ResultInAccumulator);
+    checkException();
+
+    // done.
+    done.link(pasm());
+}
+
+void Assembler::bitAnd(int lhs)
+{
+    PlatformAssembler::Address lhsAddr = regAddr(lhs);
+    pasm()->regToInt32(lhsAddr, PlatformAssembler::ScratchRegister);
+    pasm()->pushAligned(PlatformAssembler::ScratchRegister);
+    pasm()->toInt32();
+    pasm()->popAligned(PlatformAssembler::ScratchRegister);
+    pasm()->and32(PlatformAssembler::ScratchRegister, PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(IntegerTag);
+}
+
+void Assembler::bitOr(int lhs)
+{
+    PlatformAssembler::Address lhsAddr = regAddr(lhs);
+    pasm()->regToInt32(lhsAddr, PlatformAssembler::ScratchRegister);
+    pasm()->pushAligned(PlatformAssembler::ScratchRegister);
+    pasm()->toInt32();
+    pasm()->popAligned(PlatformAssembler::ScratchRegister);
+    pasm()->or32(PlatformAssembler::ScratchRegister, PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(IntegerTag);
+}
+
+void Assembler::bitXor(int lhs)
+{
+    PlatformAssembler::Address lhsAddr = regAddr(lhs);
+    pasm()->regToInt32(lhsAddr, PlatformAssembler::ScratchRegister);
+    pasm()->pushAligned(PlatformAssembler::ScratchRegister);
+    pasm()->toInt32();
+    pasm()->popAligned(PlatformAssembler::ScratchRegister);
+    pasm()->xor32(PlatformAssembler::ScratchRegister, PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(IntegerTag);
+}
+
+void Assembler::ushr(int lhs)
+{
+    PlatformAssembler::Address lhsAddr = regAddr(lhs);
+    pasm()->regToInt32(lhsAddr, PlatformAssembler::ScratchRegister);
+    pasm()->pushAligned(PlatformAssembler::ScratchRegister);
+    pasm()->toInt32();
+    pasm()->and32(TrustedImm32(0x1f), PlatformAssembler::AccumulatorRegisterValue,
+                  PlatformAssembler::ScratchRegister);
+    pasm()->popAligned(PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->urshift32(PlatformAssembler::ScratchRegister, PlatformAssembler::AccumulatorRegisterValue);
+    auto doubleEncode = pasm()->branch32(PlatformAssembler::LessThan,
+                                         PlatformAssembler::AccumulatorRegisterValue,
+                                         TrustedImm32(0));
+    pasm()->setAccumulatorTag(IntegerTag);
+    auto done = pasm()->jump();
+
+    doubleEncode.link(pasm());
+    pasm()->convertUInt32ToDouble(PlatformAssembler::AccumulatorRegisterValue,
+                                  PlatformAssembler::FPScratchRegister,
+                                  PlatformAssembler::ScratchRegister);
+    pasm()->encodeDoubleIntoAccumulator(PlatformAssembler::FPScratchRegister);
+    done.link(pasm());
+}
+
+void Assembler::shr(int lhs)
+{
+    PlatformAssembler::Address lhsAddr = regAddr(lhs);
+    pasm()->regToInt32(lhsAddr, PlatformAssembler::ScratchRegister);
+    pasm()->pushAligned(PlatformAssembler::ScratchRegister);
+    pasm()->toInt32();
+    pasm()->and32(TrustedImm32(0x1f), PlatformAssembler::AccumulatorRegisterValue,
+                  PlatformAssembler::ScratchRegister);
+    pasm()->popAligned(PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->rshift32(PlatformAssembler::ScratchRegister, PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(IntegerTag);
+}
+
+void Assembler::shl(int lhs)
+{
+    PlatformAssembler::Address lhsAddr = regAddr(lhs);
+    pasm()->regToInt32(lhsAddr, PlatformAssembler::ScratchRegister);
+    pasm()->pushAligned(PlatformAssembler::ScratchRegister);
+    pasm()->toInt32();
+    pasm()->and32(TrustedImm32(0x1f), PlatformAssembler::AccumulatorRegisterValue,
+                  PlatformAssembler::ScratchRegister);
+    pasm()->popAligned(PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->lshift32(PlatformAssembler::ScratchRegister, PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(IntegerTag);
+}
+
+void Assembler::bitAndConst(int rhs)
+{
+    pasm()->toInt32();
+    pasm()->and32(TrustedImm32(rhs), PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(IntegerTag);
+}
+
+void Assembler::bitOrConst(int rhs)
+{
+    pasm()->toInt32();
+    pasm()->or32(TrustedImm32(rhs), PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(IntegerTag);
+}
+
+void Assembler::bitXorConst(int rhs)
+{
+    pasm()->toInt32();
+    pasm()->xor32(TrustedImm32(rhs), PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(IntegerTag);
+}
+
+void Assembler::ushrConst(int rhs)
+{
+    rhs &= 0x1f;
+    pasm()->toInt32();
+    if (rhs) // shift with 0 can act weird
+        pasm()->urshift32(TrustedImm32(rhs), PlatformAssembler::AccumulatorRegisterValue);
+    auto doubleEncode = pasm()->branch32(PlatformAssembler::LessThan,
+                                         PlatformAssembler::AccumulatorRegisterValue,
+                                         TrustedImm32(0));
+    pasm()->setAccumulatorTag(IntegerTag);
+    auto done = pasm()->jump();
+
+    doubleEncode.link(pasm());
+    pasm()->convertUInt32ToDouble(PlatformAssembler::AccumulatorRegisterValue,
+                                  PlatformAssembler::FPScratchRegister,
+                                  PlatformAssembler::ScratchRegister);
+    pasm()->encodeDoubleIntoAccumulator(PlatformAssembler::FPScratchRegister);
+    done.link(pasm());
+}
+
+void Assembler::shrConst(int rhs)
+{
+    rhs &= 0x1f;
+    pasm()->toInt32();
+    if (rhs) // shift with 0 can act weird
+        pasm()->rshift32(TrustedImm32(rhs), PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(IntegerTag);
+}
+
+void Assembler::shlConst(int rhs)
+{
+    rhs &= 0x1f;
+    pasm()->toInt32();
+    if (rhs) // shift with 0 can act weird
+        pasm()->lshift32(TrustedImm32(rhs), PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(IntegerTag);
+}
+
+void Assembler::mul(int lhs)
+{
+    auto done = pasm()->binopBothIntPath(regAddr(lhs), [this](){
+        auto overflowed = pasm()->branchMul32(PlatformAssembler::Overflow,
+                                              PlatformAssembler::AccumulatorRegisterValue,
+                                              PlatformAssembler::ScratchRegister);
+        pasm()->setAccumulatorTag(IntegerTag,
+                                  PlatformAssembler::ScratchRegister);
+        return overflowed;
+    });
+
+    // slow path:
+    saveAccumulatorInFrame();
+    prepareCallWithArgCount(2);
+    passAccumulatorAsArg(1);
+    passRegAsArg(lhs, 0);
+    IN_JIT_GENERATE_RUNTIME_CALL(Runtime::method_mul, ResultInAccumulator);
+    checkException();
+
+    // done.
+    done.link(pasm());
+}
+
+void Assembler::div(int lhs)
+{
+    saveAccumulatorInFrame();
+    prepareCallWithArgCount(2);
+    passAccumulatorAsArg(1);
+    passRegAsArg(lhs, 0);
+    IN_JIT_GENERATE_RUNTIME_CALL(Runtime::method_div, ResultInAccumulator);
+    checkException();
+}
+
+void Assembler::mod(int lhs)
+{
+    saveAccumulatorInFrame();
+    prepareCallWithArgCount(2);
+    passAccumulatorAsArg(1);
+    passRegAsArg(lhs, 0);
+    IN_JIT_GENERATE_RUNTIME_CALL(Runtime::method_mod, ResultInAccumulator);
+    checkException();
+}
+
+void Assembler::sub(int lhs)
+{
+    auto done = pasm()->binopBothIntPath(regAddr(lhs), [this](){
+        auto overflowed = pasm()->branchSub32(PlatformAssembler::Overflow,
+                                              PlatformAssembler::AccumulatorRegisterValue,
+                                              PlatformAssembler::ScratchRegister);
+        pasm()->setAccumulatorTag(IntegerTag,
+                                  PlatformAssembler::ScratchRegister);
+        return overflowed;
+    });
+
+    // slow path:
+    saveAccumulatorInFrame();
+    prepareCallWithArgCount(2);
+    passAccumulatorAsArg(1);
+    passRegAsArg(lhs, 0);
+    IN_JIT_GENERATE_RUNTIME_CALL(Runtime::method_sub, ResultInAccumulator);
+    checkException();
+
+    // done.
+    done.link(pasm());
+}
+
+void Assembler::cmpeqNull()
+{
+    pasm()->isNullOrUndefined();
+    pasm()->setAccumulatorTag(QV4::Value::ValueTypeInternal::Boolean);
+}
+
+void Assembler::cmpneNull()
+{
+    pasm()->isNullOrUndefined();
+    pasm()->xor32(TrustedImm32(1), PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(QV4::Value::ValueTypeInternal::Boolean);
+}
+
+void Assembler::cmpeqInt(int lhs)
+{
+    saveAccumulatorInFrame();
+    pasm()->pushValueAligned(Encode(lhs));
+    if (PlatformAssembler::ArgInRegCount < 2)
+        pasm()->push(PlatformAssembler::StackPointerRegister);
+    else
+        pasm()->move(PlatformAssembler::StackPointerRegister, pasm()->registerForArg(1));
+    passAccumulatorAsArg_internal(0, true);
+    pasm()->callRuntime("Runtime::method_equal", (void*)Runtime::method_equal, ResultInAccumulator);
+    if (PlatformAssembler::ArgInRegCount < 2)
+        pasm()->addPtr(TrustedImm32(2 * PlatformAssembler::PointerSize), PlatformAssembler::StackPointerRegister);
+    pasm()->popValueAligned();
+}
+
+void Assembler::cmpneInt(int lhs)
+{
+    saveAccumulatorInFrame();
+    pasm()->pushValueAligned(Encode(lhs));
+    if (PlatformAssembler::ArgInRegCount < 2)
+        pasm()->push(PlatformAssembler::StackPointerRegister);
+    else
+        pasm()->move(PlatformAssembler::StackPointerRegister, pasm()->registerForArg(1));
+    passAccumulatorAsArg_internal(0, true);
+    pasm()->callRuntime("Runtime::method_notEqual", (void*)Runtime::method_notEqual, ResultInAccumulator);
+    if (PlatformAssembler::ArgInRegCount < 2)
+        pasm()->addPtr(TrustedImm32(2 * PlatformAssembler::PointerSize), PlatformAssembler::StackPointerRegister);
+    pasm()->popValueAligned();
+}
+
+void Assembler::cmp(int /*cond*/, CmpFunc function, const char *functionName, int lhs)
+{
+//    PlatformAssembler::Address lhsAddr(PlatformAssembler::JSStackFrameRegister, lhs * int(sizeof(QV4::Value)));
+//    auto done = pasm()->cmpFastPath(static_cast<PlatformAssembler::RelationalCondition>(cond), lhsAddr);
+
+    // slow path:
+    saveAccumulatorInFrame();
+    prepareCallWithArgCount(2);
+    passAccumulatorAsArg(1);
+    passRegAsArg(lhs, 0);
+
+    callRuntime(functionName, reinterpret_cast<void*>(function), ResultInAccumulator);
+    checkException();
+    pasm()->setAccumulatorTag(QV4::Value::ValueTypeInternal::Boolean);
+
+    // done.
+//    done.link(pasm());
+}
+
+void Assembler::cmpeq(int lhs)
+{
+    cmp(PlatformAssembler::Equal, &Runtime::method_compareEqual,
+        "Runtime::method_compareEqual", lhs);
+}
+
+void Assembler::cmpne(int lhs)
+{
+    cmp(PlatformAssembler::NotEqual, &Runtime::method_compareNotEqual,
+        "Runtime::method_compareNotEqual", lhs);
+}
+
+void Assembler::cmpgt(int lhs)
+{
+    cmp(PlatformAssembler::GreaterThan, &Runtime::method_compareGreaterThan,
+        "Runtime::method_compareGreaterThan", lhs);
+}
+
+void Assembler::cmpge(int lhs)
+{
+    cmp(PlatformAssembler::GreaterThanOrEqual, &Runtime::method_compareGreaterEqual,
+        "Runtime::method_compareGreaterEqual", lhs);
+}
+
+void Assembler::cmplt(int lhs)
+{
+    cmp(PlatformAssembler::LessThan, &Runtime::method_compareLessThan,
+        "Runtime::method_compareLessThan", lhs);
+}
+
+void Assembler::cmple(int lhs)
+{
+    cmp(PlatformAssembler::LessThanOrEqual, &Runtime::method_compareLessEqual,
+        "Runtime::method_compareLessEqual", lhs);
+}
+
+void Assembler::cmpStrictEqual(int lhs)
+{
+    saveAccumulatorInFrame();
+    prepareCallWithArgCount(2);
+    passAccumulatorAsArg(1);
+    passRegAsArg(lhs, 0);
+    IN_JIT_GENERATE_RUNTIME_CALL(RuntimeHelpers::strictEqual, ResultInAccumulator);
+    pasm()->setAccumulatorTag(QV4::Value::ValueTypeInternal::Boolean);
+}
+
+void Assembler::cmpStrictNotEqual(int lhs)
+{
+    saveAccumulatorInFrame();
+    prepareCallWithArgCount(2);
+    passAccumulatorAsArg(1);
+    passRegAsArg(lhs, 0);
+    IN_JIT_GENERATE_RUNTIME_CALL(RuntimeHelpers::strictEqual, ResultInAccumulator);
+    pasm()->xor32(TrustedImm32(1), PlatformAssembler::AccumulatorRegisterValue);
+    pasm()->setAccumulatorTag(QV4::Value::ValueTypeInternal::Boolean);
+}
+
+void Assembler::jump(int offset)
+{
+    pasm()->patches.push_back({ pasm()->jump(), offset });
+}
+
+void Assembler::jumpTrue(int offset)
+{
+    pasm()->toBoolean([this, offset](PlatformAssembler::RegisterID resultReg) {
+        auto jump = pasm()->branch32(PlatformAssembler::NotEqual, TrustedImm32(0), resultReg);
+        pasm()->patches.push_back({ jump, offset });
+    });
+}
+
+void Assembler::jumpFalse(int offset)
+{
+    pasm()->toBoolean([this, offset](PlatformAssembler::RegisterID resultReg) {
+        auto jump = pasm()->branch32(PlatformAssembler::Equal, TrustedImm32(0), resultReg);
+        pasm()->patches.push_back({ jump, offset });
+    });
+}
+
+void Assembler::jumpStrictEqualStackSlotInt(int lhs, int rhs, int offset)
+{
+    pasm()->jumpStrictEqualStackSlotInt(lhs, rhs, offset);
+}
+
+void Assembler::jumpStrictNotEqualStackSlotInt(int lhs, int rhs, int offset)
+{
+    pasm()->jumpStrictNotEqualStackSlotInt(lhs, rhs, offset);
+}
+
+void Assembler::prepareCallWithArgCount(int argc)
+{
 #ifndef QT_NO_DEBUG
-        for (CallInfo call : qAsConst(_callInfos))
-            functions[linkBuffer.locationOf(call.label).dataLocation()] = call.functionName;
+    Q_ASSERT(remainingArgcForCall == NoCall);
+    remainingArgcForCall = argc;
 #endif
 
-        QBuffer buf;
-        buf.open(QIODevice::WriteOnly);
-        WTF::setDataFile(new QIODevicePrintStream(&buf));
+    if (argc > PlatformAssembler::ArgInRegCount) {
+        argcOnStackForCall = int(WTF::roundUpToMultipleOf(16, size_t(argc - PlatformAssembler::ArgInRegCount) * PlatformAssembler::PointerSize));
+        pasm()->subPtr(TrustedImm32(argcOnStackForCall), PlatformAssembler::StackPointerRegister);
+    }
+}
 
-        name = _function->name->toUtf8();
-        if (name.isEmpty())
-            name = "IR::Function(0x" + QByteArray::number(quintptr(_function), 16) + ')';
-        codeRef = linkBuffer.finalizeCodeWithDisassembly("%s", name.data());
+void Assembler::storeInstructionPointer(int instructionOffset)
+{
+    PlatformAssembler::Address addr(PlatformAssembler::CppStackFrameRegister,
+                                    offsetof(QV4::CppStackFrame, instructionPointer));
+    pasm()->store32(TrustedImm32(instructionOffset), addr);
+}
 
-        WTF::setDataFile(stderr);
-        printDisassembledOutputWithCalls(buf.data(), functions);
+Address argStackAddress(int arg)
+{
+    int offset = arg - PlatformAssembler::ArgInRegCount;
+    Q_ASSERT(offset >= 0);
+    return Address(PlatformAssembler::StackPointerRegister, offset * PlatformAssembler::PointerSize);
+}
+
+void Assembler::passAccumulatorAsArg(int arg)
+{
+#ifndef QT_NO_DEBUG
+    Q_ASSERT(arg < remainingArgcForCall);
+    --remainingArgcForCall;
+#endif
+
+    passAccumulatorAsArg_internal(arg, false);
+}
+
+void Assembler::passAccumulatorAsArg_internal(int arg, bool push)
+{
+    if (arg < PlatformAssembler::ArgInRegCount) {
+        pasm()->addPtr(TrustedImm32(offsetof(CallData, accumulator)),
+                       PlatformAssembler::JSStackFrameRegister,
+                       pasm()->registerForArg(arg));
     } else {
-        codeRef = linkBuffer.finalizeCodeWithoutDisassembly();
+        pasm()->addPtr(TrustedImm32(offsetof(CallData, accumulator)),
+                       PlatformAssembler::JSStackFrameRegister,
+                       PlatformAssembler::ScratchRegister);
+        if (push)
+            pasm()->push(PlatformAssembler::ScratchRegister);
+        else
+            pasm()->storePtr(PlatformAssembler::ScratchRegister,
+                             argStackAddress(arg));
     }
+}
 
-#if defined(Q_OS_LINUX)
-    // This implements writing of JIT'd addresses so that perf can find the
-    // symbol names.
-    //
-    // Perf expects the mapping to be in a certain place and have certain
-    // content, for more information, see:
-    // https://github.com/torvalds/linux/blob/master/tools/perf/Documentation/jit-interface.txt
-    static bool doProfile = !qEnvironmentVariableIsEmpty("QV4_PROFILE_WRITE_PERF_MAP");
-    static bool profileInitialized = false;
-    if (doProfile && !profileInitialized) {
-        profileInitialized = true;
+void Assembler::passFunctionAsArg(int arg)
+{
+#ifndef QT_NO_DEBUG
+    Q_ASSERT(arg < remainingArgcForCall);
+    --remainingArgcForCall;
+#endif
 
-        char pname[PATH_MAX];
-        snprintf(pname, PATH_MAX - 1, "/tmp/perf-%lu.map",
-                                      (unsigned long)QCoreApplication::applicationPid());
+    if (arg < PlatformAssembler::ArgInRegCount) {
+        pasm()->loadFunctionPtr(pasm()->registerForArg(arg));
+    } else {
+        pasm()->loadFunctionPtr(PlatformAssembler::ScratchRegister);
+        pasm()->storePtr(PlatformAssembler::ScratchRegister,
+                         argStackAddress(arg));
+    }
+}
 
-        pmap = fopen(pname, "w");
-        if (!pmap)
-            qWarning("QV4: Can't write %s, call stacks will not contain JavaScript function names", pname);
+void Assembler::passEngineAsArg(int arg)
+{
+#ifndef QT_NO_DEBUG
+    Q_ASSERT(arg < remainingArgcForCall);
+    --remainingArgcForCall;
+#endif
 
-        // make sure we clean up nicely
-        std::atexit(qt_closePmap);
+    if (arg < PlatformAssembler::ArgInRegCount) {
+        pasm()->move(PlatformAssembler::EngineRegister, pasm()->registerForArg(arg));
+    } else {
+        pasm()->storePtr(PlatformAssembler::EngineRegister, argStackAddress(arg));
     }
+}
 
-    if (pmap) {
-        // this may have been pre-populated, if QV4_SHOW_ASM was on
-        if (name.isEmpty()) {
-            name = _function->name->toUtf8();
-            if (name.isEmpty())
-                name = "IR::Function(0x" + QByteArray::number(quintptr(_function), 16) + ')';
-        }
+void Assembler::passRegAsArg(int reg, int arg)
+{
+#ifndef QT_NO_DEBUG
+    Q_ASSERT(arg < remainingArgcForCall);
+    --remainingArgcForCall;
+#endif
 
-        fprintf(pmap, "%llx %x %.*s\n",
-                      (long long unsigned int)codeRef.code().executableAddress(),
-                      *codeSize,
-                      name.length(),
-                      name.constData());
-        fflush(pmap);
+    if (arg < PlatformAssembler::ArgInRegCount) {
+        pasm()->addPtr(TrustedImm32(reg * int(sizeof(QV4::Value))),
+                       PlatformAssembler::JSStackFrameRegister,
+                       pasm()->registerForArg(arg));
+    } else {
+        pasm()->addPtr(TrustedImm32(reg * int(sizeof(QV4::Value))),
+                       PlatformAssembler::JSStackFrameRegister,
+                       PlatformAssembler::ScratchRegister);
+        pasm()->storePtr(PlatformAssembler::ScratchRegister,
+                         argStackAddress(arg));
     }
+}
+
+void JIT::Assembler::passCppFrameAsArg(int arg)
+{
+#ifndef QT_NO_DEBUG
+    Q_ASSERT(arg < remainingArgcForCall);
+    --remainingArgcForCall;
 #endif
 
-    return codeRef;
+    if (arg < PlatformAssembler::ArgInRegCount) {
+        pasm()->move(PlatformAssembler::CppStackFrameRegister, pasm()->registerForArg(arg));
+    } else {
+        pasm()->store32(PlatformAssembler::CppStackFrameRegister, argStackAddress(arg));
+    }
 }
 
-template class QV4::JIT::Assembler<DefaultAssemblerTargetConfiguration>;
-#if defined(V4_BOOTSTRAP)
-#if !CPU(ARM_THUMB2)
-template class QV4::JIT::Assembler<AssemblerTargetConfiguration<JSC::MacroAssemblerARMv7, NoOperatingSystemSpecialization>>;
-#endif
-#if !CPU(ARM64)
-template class QV4::JIT::Assembler<AssemblerTargetConfiguration<JSC::MacroAssemblerARM64, NoOperatingSystemSpecialization>>;
-#endif
+void Assembler::passInt32AsArg(int value, int arg)
+{
+#ifndef QT_NO_DEBUG
+    Q_ASSERT(arg < remainingArgcForCall);
+    --remainingArgcForCall;
 #endif
 
+    if (arg < PlatformAssembler::ArgInRegCount) {
+        pasm()->move(TrustedImm32(value), pasm()->registerForArg(arg));
+    } else {
+        pasm()->store32(TrustedImm32(value), argStackAddress(arg));
+    }
+}
+
+void Assembler::callRuntime(const char *functionName, const void *funcPtr,
+                            Assembler::CallResultDestination dest)
+{
+#ifndef QT_NO_DEBUG
+    Q_ASSERT(remainingArgcForCall == 0);
+    remainingArgcForCall = NoCall;
 #endif
+    pasm()->callRuntime(functionName, funcPtr, dest);
+    if (argcOnStackForCall > 0) {
+        pasm()->addPtr(TrustedImm32(argcOnStackForCall), PlatformAssembler::StackPointerRegister);
+        argcOnStackForCall = 0;
+    }
+}
+
+void Assembler::saveAccumulatorInFrame()
+{
+    pasm()->storeAccumulator(PlatformAssembler::Address(PlatformAssembler::JSStackFrameRegister,
+                                                       offsetof(CallData, accumulator)));
+}
+
+void Assembler::checkException()
+{
+    pasm()->addCatchyJump(
+                pasm()->branch32(
+                    PlatformAssembler::NotEqual,
+                    PlatformAssembler::Address(PlatformAssembler::EngineRegister,
+                                               offsetof(EngineBase, hasException)),
+                    TrustedImm32(0)));
+}
+
+void Assembler::gotoCatchException()
+{
+    pasm()->addCatchyJump(pasm()->jump());
+}
+
+void Assembler::getException()
+{
+    Q_STATIC_ASSERT_FOR_SANE_COMPILERS(sizeof(QV4::EngineBase::hasException) == 1);
+
+    Address hasExceptionAddr(PlatformAssembler::EngineRegister,
+                             offsetof(EngineBase, hasException));
+    PlatformAssembler::Jump nope = pasm()->branch8(PlatformAssembler::Equal,
+                                                  hasExceptionAddr,
+                                                  TrustedImm32(0));
+    pasm()->loadPtr(Address(PlatformAssembler::EngineRegister,
+                            offsetof(EngineBase, exceptionValue)),
+                    PlatformAssembler::ScratchRegister);
+    pasm()->loadAccumulator(Address(PlatformAssembler::ScratchRegister));
+    pasm()->store8(TrustedImm32(0), hasExceptionAddr);
+    auto done = pasm()->jump();
+    nope.link(pasm());
+    pasm()->loadValue(Primitive::emptyValue().asReturnedValue());
+
+    done.link(pasm());
+}
+
+void Assembler::setException()
+{
+    Address addr(PlatformAssembler::EngineRegister, offsetof(EngineBase, exceptionValue));
+    pasm()->loadPtr(addr, PlatformAssembler::ScratchRegister);
+    pasm()->storeAccumulator(Address(PlatformAssembler::ScratchRegister));
+    addr.offset = offsetof(EngineBase, hasException);
+    Q_STATIC_ASSERT_FOR_SANE_COMPILERS(sizeof(QV4::EngineBase::hasException) == 1);
+    pasm()->store8(TrustedImm32(1), addr);
+}
+
+void Assembler::setExceptionHandler(int offset)
+{
+    auto l = pasm()->storePtrWithPatch(TrustedImmPtr(nullptr), pasm()->exceptionHandlerAddress());
+    pasm()->ehTargets.push_back({ l, offset });
+}
+
+
+void Assembler::clearExceptionHandler()
+{
+    pasm()->storePtr(TrustedImmPtr(nullptr), pasm()->exceptionHandlerAddress());
+}
+
+void Assembler::pushCatchContext(int name, int reg)
+{
+    pasm()->copyReg(pasm()->contextAddress(), regAddr(reg));
+    prepareCallWithArgCount(2);
+    passInt32AsArg(name, 1);
+    passRegAsArg(CallData::Context, 0);
+    IN_JIT_GENERATE_RUNTIME_CALL(Runtime::method_createCatchContext, ResultInAccumulator);
+    pasm()->storeAccumulator(pasm()->contextAddress());
+}
+
+void Assembler::popContext(int reg)
+{
+    pasm()->copyReg(regAddr(reg), pasm()->contextAddress());
+}
+
+void Assembler::ret()
+{
+    pasm()->generateFunctionExit();
+}
+
+} // JIT namespace
+} // QV4 namepsace
+
+QT_END_NAMESPACE
+
+#endif // V4_ENABLE_JIT
diff --git a/src/qml/jit/qv4assembler_p.h b/src/qml/jit/qv4assembler_p.h
index 2ae4818814..eafe27c8bb 100644
--- a/src/qml/jit/qv4assembler_p.h
+++ b/src/qml/jit/qv4assembler_p.h
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtQml module of the Qt Toolkit.
@@ -36,6 +36,7 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
+
 #ifndef QV4ASSEMBLER_P_H
 #define QV4ASSEMBLER_P_H
 
@@ -50,1802 +51,138 @@
 // We mean it.
 //
 
-#include "private/qv4global_p.h"
-#include "private/qv4jsir_p.h"
-#include "private/qv4isel_p.h"
-#include "private/qv4isel_util_p.h"
-#include "private/qv4value_p.h"
-#include "private/qv4context_p.h"
-#include "private/qv4engine_p.h"
-#include "private/qv4writebarrier_p.h"
-#include "qv4targetplatform_p.h"
-
-#include <config.h>
-#include <wtf/Vector.h>
-
-#include <climits>
-
-#if ENABLE(ASSEMBLER)
-
-#include <assembler/MacroAssembler.h>
-#include <assembler/MacroAssemblerCodeRef.h>
+#include <private/qv4global_p.h>
+#include <private/qv4function_p.h>
+#include <QHash>
 
 QT_BEGIN_NAMESPACE
 
 namespace QV4 {
 namespace JIT {
 
-struct CompilationUnit : public QV4::CompiledData::CompilationUnit
-{
-    virtual ~CompilationUnit();
-
-#if !defined(V4_BOOTSTRAP)
-    void linkBackendToEngine(QV4::ExecutionEngine *engine) override;
-    bool memoryMapCode(QString *errorString) override;
-#endif
-    void prepareCodeOffsetsForDiskStorage(CompiledData::Unit *unit) override;
-    bool saveCodeToDisk(QIODevice *device, const CompiledData::Unit *unit, QString *errorString) override;
-
-    // Coderef + execution engine
-
-    QVector<JSC::MacroAssemblerCodeRef> codeRefs;
-};
-
-template <typename PlatformAssembler, TargetOperatingSystemSpecialization Specialization>
-struct AssemblerTargetConfiguration
-{
-    typedef JSC::MacroAssembler<PlatformAssembler> MacroAssembler;
-    typedef TargetPlatform<PlatformAssembler, Specialization> Platform;
-    // More things coming here in the future, such as Target OS
-};
-
-#if CPU(ARM_THUMB2)
-typedef JSC::MacroAssemblerARMv7 DefaultPlatformMacroAssembler;
-typedef AssemblerTargetConfiguration<DefaultPlatformMacroAssembler, NoOperatingSystemSpecialization> DefaultAssemblerTargetConfiguration;
-#elif CPU(ARM64)
-typedef JSC::MacroAssemblerARM64 DefaultPlatformMacroAssembler;
-typedef AssemblerTargetConfiguration<DefaultPlatformMacroAssembler, NoOperatingSystemSpecialization> DefaultAssemblerTargetConfiguration;
-#elif CPU(ARM_TRADITIONAL)
-typedef JSC::MacroAssemblerARM DefaultPlatformMacroAssembler;
-typedef AssemblerTargetConfiguration<DefaultPlatformMacroAssembler, NoOperatingSystemSpecialization> DefaultAssemblerTargetConfiguration;
-#elif CPU(MIPS)
-typedef JSC::MacroAssemblerMIPS DefaultPlatformMacroAssembler;
-typedef AssemblerTargetConfiguration<DefaultPlatformMacroAssembler, NoOperatingSystemSpecialization> DefaultAssemblerTargetConfiguration;
-#elif CPU(X86)
-typedef JSC::MacroAssemblerX86 DefaultPlatformMacroAssembler;
-typedef AssemblerTargetConfiguration<DefaultPlatformMacroAssembler, NoOperatingSystemSpecialization> DefaultAssemblerTargetConfiguration;
-#elif CPU(X86_64)
-typedef JSC::MacroAssemblerX86_64 DefaultPlatformMacroAssembler;
-
-#if OS(WINDOWS)
-typedef AssemblerTargetConfiguration<DefaultPlatformMacroAssembler, WindowsSpecialization> DefaultAssemblerTargetConfiguration;
-#else
-typedef AssemblerTargetConfiguration<DefaultPlatformMacroAssembler, NoOperatingSystemSpecialization> DefaultAssemblerTargetConfiguration;
-#endif
-
-#elif CPU(SH4)
-typedef JSC::MacroAssemblerSH4 DefaultPlatformMacroAssembler;
-typedef AssemblerTargetConfiguration<DefaultPlatformMacroAssembler, NoOperatingSystemSpecialization> DefaultAssemblerTargetConfiguration;
-#endif
-
-#define isel_stringIfyx(s) #s
-#define isel_stringIfy(s) isel_stringIfyx(s)
-
-#define generateRuntimeCall(as, t, function, ...) \
-    as->generateFunctionCallImp(Runtime::Method_##function##_NeedsExceptionCheck, t, "Runtime::" isel_stringIfy(function), typename JITAssembler::RuntimeCall(QV4::Runtime::function), __VA_ARGS__)
-
-
-template <typename JITAssembler, typename MacroAssembler, typename TargetPlatform, int RegisterSize>
-struct RegisterSizeDependentAssembler
-{
-};
-
-template <typename JITAssembler, typename MacroAssembler, typename TargetPlatform>
-struct RegisterSizeDependentAssembler<JITAssembler, MacroAssembler, TargetPlatform, 4>
-{
-    using RegisterID = typename JITAssembler::RegisterID;
-    using FPRegisterID = typename JITAssembler::FPRegisterID;
-    using RelationalCondition = typename JITAssembler::RelationalCondition;
-    using ResultCondition = typename JITAssembler::ResultCondition;
-    using Address = typename JITAssembler::Address;
-    using Pointer = typename JITAssembler::Pointer;
-    using TrustedImm32 = typename JITAssembler::TrustedImm32;
-    using TrustedImm64 = typename JITAssembler::TrustedImm64;
-    using Jump = typename JITAssembler::Jump;
-    using Label = typename JITAssembler::Label;
-    using ValueTypeInternal = Value::ValueTypeInternal_32;
-    using TargetPrimitive = TargetPrimitive32;
-
-    static void emitSetGrayBit(JITAssembler *as, RegisterID base)
-    {
-        bool returnValueUsed = (base == TargetPlatform::ReturnValueRegister);
-
-        as->push(TargetPlatform::EngineRegister); // free up one register for work
-
-        RegisterID grayBitmap = returnValueUsed ? TargetPlatform::ScratchRegister : TargetPlatform::ReturnValueRegister;
-        as->move(base, grayBitmap);
-        Q_ASSERT(base != grayBitmap);
-        as->urshift32(TrustedImm32(Chunk::ChunkShift), grayBitmap);
-        as->lshift32(TrustedImm32(Chunk::ChunkShift), grayBitmap);
-        Q_STATIC_ASSERT(offsetof(Chunk, grayBitmap) == 0);
-
-        RegisterID index = base;
-        as->move(base, index);
-        as->sub32(grayBitmap, index);
-        as->urshift32(TrustedImm32(Chunk::SlotSizeShift), index);
-        RegisterID grayIndex = TargetPlatform::EngineRegister;
-        as->move(index, grayIndex);
-        as->urshift32(TrustedImm32(Chunk::BitShift), grayIndex);
-        as->lshift32(TrustedImm32(2), grayIndex); // 4 bytes per quintptr
-        as->add32(grayIndex, grayBitmap);
-        as->and32(TrustedImm32(Chunk::Bits - 1), index);
-
-        RegisterID bit = TargetPlatform::EngineRegister;
-        as->move(TrustedImm32(1), bit);
-        as->lshift32(index, bit);
-
-        as->load32(Pointer(grayBitmap, 0), index);
-        as->or32(bit, index);
-        as->store32(index, Pointer(grayBitmap, 0));
-
-        as->pop(TargetPlatform::EngineRegister);
-    }
-
-#if WRITEBARRIER(none)
-    static Q_ALWAYS_INLINE void emitWriteBarrier(JITAssembler *, Address) {}
-#endif
-
-    static void loadDouble(JITAssembler *as, Address addr, FPRegisterID dest)
-    {
-        as->MacroAssembler::loadDouble(addr, dest);
-    }
-
-    static void storeDouble(JITAssembler *as, FPRegisterID source, Address addr, WriteBarrier::Type barrier)
-    {
-        as->MacroAssembler::storeDouble(source, addr);
-        if (WriteBarrier::isRequired<WriteBarrier::Primitive>() && barrier == WriteBarrier::Barrier)
-            emitWriteBarrier(as, addr);
-    }
-
-    static void storeDouble(JITAssembler *as, FPRegisterID source, IR::Expr* target)
-    {
-        WriteBarrier::Type barrier;
-        Pointer ptr = as->loadAddressForWriting(TargetPlatform::ScratchRegister, target, &barrier);
-        as->storeDouble(source, ptr, barrier);
-    }
-
-    static void storeValue(JITAssembler *as, TargetPrimitive value, Address destination, WriteBarrier::Type barrier)
-    {
-        as->store32(TrustedImm32(value.value()), destination);
-        destination.offset += 4;
-        as->store32(TrustedImm32(value.tag()), destination);
-        if (WriteBarrier::isRequired<WriteBarrier::Primitive>() && barrier == WriteBarrier::Barrier)
-            emitWriteBarrier(as, destination);
-    }
-
-    template <typename Source, typename Destination>
-    static void copyValueViaRegisters(JITAssembler *as, Source source, Destination destination, WriteBarrier::Type barrier)
-    {
-        as->loadDouble(source, TargetPlatform::FPGpr0);
-        // We need to pass NoBarrier to storeDouble and call emitWriteBarrier ourselves, as the
-        // code in storeDouble assumes the type we're storing is actually a double, something
-        // that isn't always the case here.
-        as->storeDouble(TargetPlatform::FPGpr0, destination, WriteBarrier::NoBarrier);
-        if (WriteBarrier::isRequired<WriteBarrier::Unknown>() && barrier == WriteBarrier::Barrier)
-            emitWriteBarrier(as, destination);
-    }
-
-    static void loadDoubleConstant(JITAssembler *as, IR::Const *c, FPRegisterID target)
-    {
-        as->MacroAssembler::loadDouble(as->loadConstant(c, TargetPlatform::ScratchRegister), target);
-    }
-
-    static void storeReturnValue(JITAssembler *as, FPRegisterID dest)
-    {
-        as->moveIntsToDouble(TargetPlatform::LowReturnValueRegister, TargetPlatform::HighReturnValueRegister, dest, TargetPlatform::FPGpr0);
-    }
-
-    static void storeReturnValue(JITAssembler *as, const Pointer &dest, WriteBarrier::Type barrier)
-    {
-        Address destination = dest;
-        as->store32(TargetPlatform::LowReturnValueRegister, destination);
-        destination.offset += 4;
-        as->store32(TargetPlatform::HighReturnValueRegister, destination);
-        if (WriteBarrier::isRequired<WriteBarrier::Unknown>() && barrier == WriteBarrier::Barrier)
-            emitWriteBarrier(as, dest);
-    }
-
-    static void setFunctionReturnValueFromTemp(JITAssembler *as, IR::Temp *t)
-    {
-        const auto lowReg = TargetPlatform::LowReturnValueRegister;
-        const auto highReg = TargetPlatform::HighReturnValueRegister;
-
-        if (t->kind == IR::Temp::PhysicalRegister) {
-            switch (t->type) {
-            case IR::DoubleType:
-                as->moveDoubleToInts((FPRegisterID) t->index, lowReg, highReg);
-                break;
-            case IR::UInt32Type: {
-                RegisterID srcReg = (RegisterID) t->index;
-                Jump intRange = as->branch32(JITAssembler::GreaterThanOrEqual, srcReg, TrustedImm32(0));
-                as->convertUInt32ToDouble(srcReg, TargetPlatform::FPGpr0, TargetPlatform::ReturnValueRegister);
-                as->moveDoubleToInts(TargetPlatform::FPGpr0, lowReg, highReg);
-                Jump done = as->jump();
-                intRange.link(as);
-                as->move(srcReg, lowReg);
-                as->move(TrustedImm32(quint32(QV4::Value::ValueTypeInternal_32::Integer)), highReg);
-                done.link(as);
-            } break;
-            case IR::SInt32Type:
-                as->move((RegisterID) t->index, lowReg);
-                as->move(TrustedImm32(quint32(QV4::Value::ValueTypeInternal_32::Integer)), highReg);
-                break;
-            case IR::BoolType:
-                as->move((RegisterID) t->index, lowReg);
-                as->move(TrustedImm32(quint32(QV4::Value::ValueTypeInternal_32::Boolean)), highReg);
-                break;
-            default:
-                Q_UNREACHABLE();
-            }
-        } else {
-            Pointer addr = as->loadAddressForReading(TargetPlatform::ScratchRegister, t);
-            as->load32(addr, lowReg);
-            addr.offset += 4;
-            as->load32(addr, highReg);
-        }
-    }
-
-    static void setFunctionReturnValueFromConst(JITAssembler *as, TargetPrimitive retVal)
-    {
-        as->move(TrustedImm32(retVal.value()), TargetPlatform::LowReturnValueRegister);
-        as->move(TrustedImm32(retVal.tag()), TargetPlatform::HighReturnValueRegister);
-    }
-
-    static void loadArgumentInRegister(JITAssembler *as, IR::Temp* temp, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(as);
-        Q_UNUSED(temp);
-        Q_UNUSED(dest);
-        Q_UNUSED(argumentNumber);
-    }
-
-    static void loadArgumentInRegister(JITAssembler *as, IR::ArgLocal* al, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(as);
-        Q_UNUSED(al);
-        Q_UNUSED(dest);
-        Q_UNUSED(argumentNumber);
-    }
-
-    static void loadArgumentInRegister(JITAssembler *as, IR::Const* c, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(as);
-        Q_UNUSED(c);
-        Q_UNUSED(dest);
-        Q_UNUSED(argumentNumber);
-    }
-
-    static void loadArgumentInRegister(JITAssembler *as, IR::Expr* expr, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(as);
-        Q_UNUSED(expr);
-        Q_UNUSED(dest);
-        Q_UNUSED(argumentNumber);
-    }
-
-    static void zeroRegister(JITAssembler *as, RegisterID reg)
-    {
-        as->move(TrustedImm32(0), reg);
-    }
-
-    static void zeroStackSlot(JITAssembler *as, int slot)
-    {
-        as->poke(TrustedImm32(0), slot);
-    }
-
-    static void generateCJumpOnUndefined(JITAssembler *as,
-                                  RelationalCondition cond, IR::Expr *right,
-                                  RegisterID scratchRegister, RegisterID tagRegister,
-                                  IR::BasicBlock *nextBlock, IR::BasicBlock *currentBlock,
-                                  IR::BasicBlock *trueBlock, IR::BasicBlock *falseBlock)
-    {
-        Pointer tagAddr = as->loadAddressForReading(scratchRegister, right);
-        as->load32(tagAddr, tagRegister);
-        Jump j = as->branch32(JITAssembler::invert(cond), tagRegister, TrustedImm32(0));
-        as->addPatch(falseBlock, j);
-
-        tagAddr.offset += 4;
-        as->load32(tagAddr, tagRegister);
-        const TrustedImm32 tag(QV4::Value::Managed_Type_Internal);
-        Q_ASSERT(nextBlock == as->nextBlock());
-        Q_UNUSED(nextBlock);
-        as->generateCJumpOnCompare(cond, tagRegister, tag, currentBlock, trueBlock, falseBlock);
-    }
-
-    static void convertVarToSInt32(JITAssembler *as, IR::Expr *source, IR::Expr *target)
-    {
-        Q_ASSERT(source->type == IR::VarType);
-        // load the tag:
-        Pointer addr = as->loadAddressForReading(TargetPlatform::ScratchRegister, source);
-        Pointer tagAddr = addr;
-        tagAddr.offset += 4;
-        as->load32(tagAddr, TargetPlatform::ReturnValueRegister);
-
-        // check if it's an int32:
-        Jump fallback = as->branch32(RelationalCondition::NotEqual, TargetPlatform::ReturnValueRegister,
-                                     TrustedImm32(quint32(Value::ValueTypeInternal_32::Integer)));
-        IR::Temp *targetTemp = target->asTemp();
-        if (!targetTemp || targetTemp->kind == IR::Temp::StackSlot) {
-            as->load32(addr, TargetPlatform::ReturnValueRegister);
-            WriteBarrier::Type barrier;
-            Pointer targetAddr = as->loadAddressForWriting(TargetPlatform::ScratchRegister, target, &barrier);
-            as->store32(TargetPlatform::ReturnValueRegister, targetAddr);
-            targetAddr.offset += 4;
-            as->store32(TrustedImm32(quint32(Value::ValueTypeInternal_32::Integer)), targetAddr);
-            if (WriteBarrier::isRequired<WriteBarrier::Primitive>() && barrier == WriteBarrier::Barrier)
-                emitWriteBarrier(as, targetAddr);
-        } else {
-            as->load32(addr, (RegisterID) targetTemp->index);
-        }
-        Jump intDone = as->jump();
-
-        // not an int:
-        fallback.link(as);
-        generateRuntimeCall(as, TargetPlatform::ReturnValueRegister, toInt,
-                            as->loadAddressForReading(TargetPlatform::ScratchRegister, source));
-        as->storeInt32(TargetPlatform::ReturnValueRegister, target);
-
-        intDone.link(as);
-    }
-
-    static void loadManagedPointer(JITAssembler *as, RegisterID registerWithPtr, Pointer destAddr, WriteBarrier::Type barrier)
-    {
-        as->store32(registerWithPtr, destAddr);
-        destAddr.offset += 4;
-        as->store32(TrustedImm32(QV4::Value::Managed_Type_Internal_32), destAddr);
-        if (WriteBarrier::isRequired<WriteBarrier::Object>() && barrier == WriteBarrier::Barrier)
-            emitWriteBarrier(as, destAddr);
-    }
-
-    static Jump generateIsDoubleCheck(JITAssembler *as, RegisterID tagOrValueRegister)
-    {
-        as->and32(TrustedImm32(Value::NotDouble_Mask), tagOrValueRegister);
-        return as->branch32(RelationalCondition::NotEqual, tagOrValueRegister,
-                            TrustedImm32(Value::NotDouble_Mask));
-    }
-
-    static void initializeLocalVariables(JITAssembler *as, int localsCount)
-    {
-        as->move(TrustedImm32(0), TargetPlatform::ReturnValueRegister);
-        as->move(TrustedImm32(localsCount), TargetPlatform::ScratchRegister);
-        Label loop = as->label();
-        as->store32(TargetPlatform::ReturnValueRegister, Address(TargetPlatform::LocalsRegister));
-        as->add32(TrustedImm32(4), TargetPlatform::LocalsRegister);
-        as->store32(TargetPlatform::ReturnValueRegister, Address(TargetPlatform::LocalsRegister));
-        as->add32(TrustedImm32(4), TargetPlatform::LocalsRegister);
-        Jump jump = as->branchSub32(ResultCondition::NonZero, TrustedImm32(1), TargetPlatform::ScratchRegister);
-        jump.linkTo(loop, as);
-    }
-
-    static Jump checkIfTagRegisterIsDouble(JITAssembler *as, RegisterID tagRegister)
-    {
-        as->and32(TrustedImm32(Value::NotDouble_Mask), tagRegister);
-        Jump isNoDbl = as->branch32(RelationalCondition::Equal, tagRegister, TrustedImm32(Value::NotDouble_Mask));
-        return isNoDbl;
-    }
-};
-
-template <typename JITAssembler, typename MacroAssembler, typename TargetPlatform>
-struct RegisterSizeDependentAssembler<JITAssembler, MacroAssembler, TargetPlatform, 8>
-{
-    using RegisterID = typename JITAssembler::RegisterID;
-    using FPRegisterID = typename JITAssembler::FPRegisterID;
-    using Address = typename JITAssembler::Address;
-    using TrustedImm32 = typename JITAssembler::TrustedImm32;
-    using TrustedImm64 = typename JITAssembler::TrustedImm64;
-    using Pointer = typename JITAssembler::Pointer;
-    using RelationalCondition = typename JITAssembler::RelationalCondition;
-    using ResultCondition = typename JITAssembler::ResultCondition;
-    using BranchTruncateType = typename JITAssembler::BranchTruncateType;
-    using Jump = typename JITAssembler::Jump;
-    using Label = typename JITAssembler::Label;
-    using ValueTypeInternal = Value::ValueTypeInternal_64;
-    using TargetPrimitive = TargetPrimitive64;
-
-    static void emitSetGrayBit(JITAssembler *as, RegisterID base)
-    {
-        bool returnValueUsed = (base == TargetPlatform::ReturnValueRegister);
-
-        as->push(TargetPlatform::EngineRegister); // free up one register for work
-
-        RegisterID grayBitmap = returnValueUsed ? TargetPlatform::ScratchRegister : TargetPlatform::ReturnValueRegister;
-        as->move(base, grayBitmap);
-        Q_ASSERT(base != grayBitmap);
-        as->urshift64(TrustedImm32(Chunk::ChunkShift), grayBitmap);
-        as->lshift64(TrustedImm32(Chunk::ChunkShift), grayBitmap);
-        Q_STATIC_ASSERT(offsetof(Chunk, grayBitmap) == 0);
-
-        RegisterID index = base;
-        as->move(base, index);
-        as->sub64(grayBitmap, index);
-        as->urshift64(TrustedImm32(Chunk::SlotSizeShift), index);
-        RegisterID grayIndex = TargetPlatform::EngineRegister;
-        as->move(index, grayIndex);
-        as->urshift64(TrustedImm32(Chunk::BitShift), grayIndex);
-        as->lshift64(TrustedImm32(3), grayIndex); // 8 bytes per quintptr
-        as->add64(grayIndex, grayBitmap);
-        as->and64(TrustedImm32(Chunk::Bits - 1), index);
-
-        RegisterID bit = TargetPlatform::EngineRegister;
-        as->move(TrustedImm32(1), bit);
-        as->lshift64(index, bit);
-
-        as->load64(Pointer(grayBitmap, 0), index);
-        as->or64(bit, index);
-        as->store64(index, Pointer(grayBitmap, 0));
-
-        as->pop(TargetPlatform::EngineRegister);
-    }
+#define JIT_STRINGIFYx(s) #s
+#define JIT_STRINGIFY(s) JIT_STRINGIFYx(s)
 
-#if WRITEBARRIER(none)
-    static Q_ALWAYS_INLINE void emitWriteBarrier(JITAssembler *, Address) {}
-#endif
-
-    static void loadDouble(JITAssembler *as, Address addr, FPRegisterID dest)
-    {
-        as->load64(addr, TargetPlatform::ReturnValueRegister);
-        as->xor64(TargetPlatform::DoubleMaskRegister, TargetPlatform::ReturnValueRegister);
-        as->move64ToDouble(TargetPlatform::ReturnValueRegister, dest);
-    }
-
-    static void storeDouble(JITAssembler *as, FPRegisterID source, Address addr, WriteBarrier::Type barrier)
-    {
-        as->moveDoubleTo64(source, TargetPlatform::ReturnValueRegister);
-        as->xor64(TargetPlatform::DoubleMaskRegister, TargetPlatform::ReturnValueRegister);
-        as->store64(TargetPlatform::ReturnValueRegister, addr);
-        if (WriteBarrier::isRequired<WriteBarrier::Primitive>() && barrier == WriteBarrier::Barrier)
-            emitWriteBarrier(as, addr);
-    }
-
-    static void storeDouble(JITAssembler *as, FPRegisterID source, IR::Expr* target)
-    {
-        as->moveDoubleTo64(source, TargetPlatform::ReturnValueRegister);
-        as->xor64(TargetPlatform::DoubleMaskRegister, TargetPlatform::ReturnValueRegister);
-        WriteBarrier::Type barrier;
-        Pointer ptr = as->loadAddressForWriting(TargetPlatform::ScratchRegister, target, &barrier);
-        as->store64(TargetPlatform::ReturnValueRegister, ptr);
-        if (WriteBarrier::isRequired<WriteBarrier::Primitive>() && barrier == WriteBarrier::Barrier)
-            emitWriteBarrier(as, ptr);
-    }
-
-    static void storeReturnValue(JITAssembler *as, FPRegisterID dest)
-    {
-        as->xor64(TargetPlatform::DoubleMaskRegister, TargetPlatform::ReturnValueRegister);
-        as->move64ToDouble(TargetPlatform::ReturnValueRegister, dest);
-    }
-
-    static void storeReturnValue(JITAssembler *as, const Pointer &dest, WriteBarrier::Type barrier)
-    {
-        as->store64(TargetPlatform::ReturnValueRegister, dest);
-        if (WriteBarrier::isRequired<WriteBarrier::Unknown>() && barrier == WriteBarrier::Barrier)
-            emitWriteBarrier(as, dest);
-    }
-
-    static void setFunctionReturnValueFromTemp(JITAssembler *as, IR::Temp *t)
-    {
-        if (t->kind == IR::Temp::PhysicalRegister) {
-            if (t->type == IR::DoubleType) {
-                as->moveDoubleTo64((FPRegisterID) t->index,
-                                    TargetPlatform::ReturnValueRegister);
-                as->xor64(TargetPlatform::DoubleMaskRegister, TargetPlatform::ReturnValueRegister);
-            } else if (t->type == IR::UInt32Type) {
-                RegisterID srcReg = (RegisterID) t->index;
-                Jump intRange = as->branch32(RelationalCondition::GreaterThanOrEqual, srcReg, TrustedImm32(0));
-                as->convertUInt32ToDouble(srcReg, TargetPlatform::FPGpr0, TargetPlatform::ReturnValueRegister);
-                as->moveDoubleTo64(TargetPlatform::FPGpr0, TargetPlatform::ReturnValueRegister);
-                as->xor64(TargetPlatform::DoubleMaskRegister, TargetPlatform::ReturnValueRegister);
-                Jump done = as->jump();
-                intRange.link(as);
-                as->zeroExtend32ToPtr(srcReg, TargetPlatform::ReturnValueRegister);
-                quint64 tag = quint64(QV4::Value::ValueTypeInternal_64::Integer);
-                as->or64(TrustedImm64(tag << 32),
-                         TargetPlatform::ReturnValueRegister);
-                done.link(as);
-            } else {
-                as->zeroExtend32ToPtr((RegisterID) t->index, TargetPlatform::ReturnValueRegister);
-                quint64 tag;
-                switch (t->type) {
-                case IR::SInt32Type:
-                    tag = quint64(QV4::Value::ValueTypeInternal_64::Integer);
-                    break;
-                case IR::BoolType:
-                    tag = quint64(QV4::Value::ValueTypeInternal_64::Boolean);
-                    break;
-                default:
-                    tag = 31337; // bogus value
-                    Q_UNREACHABLE();
-                }
-                as->or64(TrustedImm64(tag << 32),
-                         TargetPlatform::ReturnValueRegister);
-            }
-        } else {
-            as->copyValue(TargetPlatform::ReturnValueRegister, t, WriteBarrier::NoBarrier);
-        }
-    }
-
-    static void setFunctionReturnValueFromConst(JITAssembler *as, TargetPrimitive retVal)
-    {
-        as->move(TrustedImm64(retVal.rawValue()), TargetPlatform::ReturnValueRegister);
-    }
-
-    static void storeValue(JITAssembler *as, TargetPrimitive value, Address destination, WriteBarrier::Type barrier)
-    {
-        as->store64(TrustedImm64(value.rawValue()), destination);
-        if (WriteBarrier::isRequired<WriteBarrier::Unknown>() && barrier == WriteBarrier::Barrier)
-            emitWriteBarrier(as, destination);
-    }
-
-    template <typename Source, typename Destination>
-    static void copyValueViaRegisters(JITAssembler *as, Source source, Destination destination, WriteBarrier::Type barrier)
-    {
-        // Use ReturnValueRegister as "scratch" register because loadArgument
-        // and storeArgument are functions that may need a scratch register themselves.
-        loadArgumentInRegister(as, source, TargetPlatform::ReturnValueRegister, 0);
-        as->storeReturnValue(destination, barrier);
-    }
-
-    static void loadDoubleConstant(JITAssembler *as, IR::Const *c, FPRegisterID target)
-    {
-        Q_STATIC_ASSERT(sizeof(int64_t) == sizeof(double));
-        int64_t i;
-        memcpy(&i, &c->value, sizeof(double));
-        as->move(TrustedImm64(i), TargetPlatform::ReturnValueRegister);
-        as->move64ToDouble(TargetPlatform::ReturnValueRegister, target);
-    }
-
-    static void loadArgumentInRegister(JITAssembler *as, Address addressOfValue, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-        as->load64(addressOfValue, dest);
-    }
-
-    static void loadArgumentInRegister(JITAssembler *as, IR::Temp* temp, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-
-        if (temp) {
-            Pointer addr = as->loadTempAddress(temp);
-            as->load64(addr, dest);
-        } else {
-            auto undefined = TargetPrimitive::undefinedValue();
-            as->move(TrustedImm64(undefined.rawValue()), dest);
-        }
-    }
-
-    static void loadArgumentInRegister(JITAssembler *as, IR::ArgLocal* al, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-
-        if (al) {
-            Pointer addr = as->loadArgLocalAddressForReading(dest, al);
-            as->load64(addr, dest);
-        } else {
-            auto undefined = TargetPrimitive::undefinedValue();
-            as->move(TrustedImm64(undefined.rawValue()), dest);
-        }
-    }
-
-    static void loadArgumentInRegister(JITAssembler *as, IR::Const* c, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-
-        auto v = convertToValue<TargetPrimitive64>(c);
-        as->move(TrustedImm64(v.rawValue()), dest);
-    }
-
-    static void loadArgumentInRegister(JITAssembler *as, IR::Expr* expr, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-
-        if (!expr) {
-            auto undefined = TargetPrimitive::undefinedValue();
-            as->move(TrustedImm64(undefined.rawValue()), dest);
-        } else if (IR::Temp *t = expr->asTemp()){
-            loadArgumentInRegister(as, t, dest, argumentNumber);
-        } else if (IR::ArgLocal *al = expr->asArgLocal()) {
-            loadArgumentInRegister(as, al, dest, argumentNumber);
-        } else if (IR::Const *c = expr->asConst()) {
-            loadArgumentInRegister(as, c, dest, argumentNumber);
-        } else {
-            Q_ASSERT(!"unimplemented expression type in loadArgument");
-        }
-    }
-
-    static void zeroRegister(JITAssembler *as, RegisterID reg)
-    {
-        as->move(TrustedImm64(0), reg);
-    }
-
-    static void zeroStackSlot(JITAssembler *as, int slot)
-    {
-        as->store64(TrustedImm64(0), as->addressForPoke(slot));
-    }
-
-    static void generateCJumpOnCompare(JITAssembler *as,
-                                       RelationalCondition cond,
-                                       RegisterID left,
-                                       TrustedImm64 right,
-                                       IR::BasicBlock *nextBlock,
-                                       IR::BasicBlock *currentBlock,
-                                       IR::BasicBlock *trueBlock,
-                                       IR::BasicBlock *falseBlock)
-    {
-        if (trueBlock == nextBlock) {
-            Jump target = as->branch64(as->invert(cond), left, right);
-            as->addPatch(falseBlock, target);
-        } else {
-            Jump target = as->branch64(cond, left, right);
-            as->addPatch(trueBlock, target);
-            as->jumpToBlock(currentBlock, falseBlock);
-        }
-    }
-
-    static void generateCJumpOnUndefined(JITAssembler *as,
-                                  RelationalCondition cond, IR::Expr *right,
-                                  RegisterID scratchRegister, RegisterID tagRegister,
-                                  IR::BasicBlock *nextBlock,  IR::BasicBlock *currentBlock,
-                                  IR::BasicBlock *trueBlock, IR::BasicBlock *falseBlock)
-    {
-        Pointer addr = as->loadAddressForReading(scratchRegister, right);
-        as->load64(addr, tagRegister);
-        const TrustedImm64 tag(0);
-        generateCJumpOnCompare(as, cond, tagRegister, tag, nextBlock, currentBlock, trueBlock, falseBlock);
-    }
-
-    static void convertVarToSInt32(JITAssembler *as, IR::Expr *source, IR::Expr *target)
-    {
-        Q_ASSERT(source->type == IR::VarType);
-        Pointer addr = as->loadAddressForReading(TargetPlatform::ScratchRegister, source);
-        as->load64(addr, TargetPlatform::ScratchRegister);
-        as->move(TargetPlatform::ScratchRegister, TargetPlatform::ReturnValueRegister);
-
-        // check if it's integer convertible
-        as->urshift64(TrustedImm32(QV4::Value::IsIntegerConvertible_Shift), TargetPlatform::ScratchRegister);
-        Jump isIntConvertible = as->branch32(RelationalCondition::Equal, TargetPlatform::ScratchRegister, TrustedImm32(3));
-
-        // nope, not integer convertible, so check for a double:
-        as->urshift64(TrustedImm32(
-                           QV4::Value::IsDoubleTag_Shift - QV4::Value::IsIntegerConvertible_Shift),
-                       TargetPlatform::ScratchRegister);
-        Jump fallback = as->branch32(RelationalCondition::GreaterThan, TargetPlatform::ScratchRegister, TrustedImm32(0));
-
-        // it's a double
-        as->xor64(TargetPlatform::DoubleMaskRegister, TargetPlatform::ReturnValueRegister);
-        as->move64ToDouble(TargetPlatform::ReturnValueRegister, TargetPlatform::FPGpr0);
-        Jump success =
-                as->branchTruncateDoubleToInt32(TargetPlatform::FPGpr0, TargetPlatform::ReturnValueRegister,
-                                                 BranchTruncateType::BranchIfTruncateSuccessful);
-
-        // not an int:
-        fallback.link(as);
-        generateRuntimeCall(as, TargetPlatform::ReturnValueRegister, toInt,
-                            as->loadAddressForReading(TargetPlatform::ScratchRegister, source));
-
-
-        isIntConvertible.link(as);
-        success.link(as);
-        IR::Temp *targetTemp = target->asTemp();
-        if (!targetTemp || targetTemp->kind == IR::Temp::StackSlot) {
-            WriteBarrier::Type barrier;
-            Pointer targetAddr = as->loadAddressForWriting(TargetPlatform::ScratchRegister, target, &barrier);
-            as->store32(TargetPlatform::ReturnValueRegister, targetAddr);
-            targetAddr.offset += 4;
-            as->store32(TrustedImm32(quint32(Value::ValueTypeInternal_64::Integer)), targetAddr);
-            if (WriteBarrier::isRequired<WriteBarrier::Primitive>() && barrier == WriteBarrier::Barrier)
-                emitWriteBarrier(as, targetAddr);
-        } else {
-            as->storeInt32(TargetPlatform::ReturnValueRegister, target);
-        }
-    }
-
-    static void loadManagedPointer(JITAssembler *as, RegisterID registerWithPtr, Pointer destAddr, WriteBarrier::Type barrier)
-    {
-        as->store64(registerWithPtr, destAddr);
-        if (WriteBarrier::isRequired<WriteBarrier::Object>() && barrier == WriteBarrier::Barrier)
-            emitWriteBarrier(as, destAddr);
-    }
-
-    static Jump generateIsDoubleCheck(JITAssembler *as, RegisterID tagOrValueRegister)
-    {
-        as->rshift32(TrustedImm32(Value::IsDoubleTag_Shift), tagOrValueRegister);
-        return as->branch32(RelationalCondition::NotEqual, tagOrValueRegister,
-                            TrustedImm32(0));
-    }
-
-    static void initializeLocalVariables(JITAssembler *as, int localsCount)
-    {
-        as->move(TrustedImm64(0), TargetPlatform::ReturnValueRegister);
-        as->move(TrustedImm32(localsCount), TargetPlatform::ScratchRegister);
-        Label loop = as->label();
-        as->store64(TargetPlatform::ReturnValueRegister, Address(TargetPlatform::LocalsRegister));
-        as->add64(TrustedImm32(8), TargetPlatform::LocalsRegister);
-        Jump jump = as->branchSub32(ResultCondition::NonZero, TrustedImm32(1), TargetPlatform::ScratchRegister);
-        jump.linkTo(loop, as);
-    }
-
-    static Jump checkIfTagRegisterIsDouble(JITAssembler *as, RegisterID tagRegister)
-    {
-        as->rshift32(TrustedImm32(Value::IsDoubleTag_Shift), tagRegister);
-        Jump isNoDbl = as->branch32(RelationalCondition::Equal, tagRegister, TrustedImm32(0));
-        return isNoDbl;
-    }
-};
-
-template <typename TargetConfiguration>
-class Assembler : public TargetConfiguration::MacroAssembler, public TargetConfiguration::Platform
-{
-    Q_DISABLE_COPY(Assembler)
+#define IN_JIT_GENERATE_RUNTIME_CALL(function, destination) \
+    callRuntime(JIT_STRINGIFY(function), \
+                reinterpret_cast<void *>(&function), \
+                destination)
+#define JIT_GENERATE_RUNTIME_CALL(function, destination) \
+    as->IN_JIT_GENERATE_RUNTIME_CALL(function, destination)
 
+class Assembler {
 public:
-    Assembler(QV4::Compiler::JSUnitGenerator *jsGenerator, IR::Function* function, QV4::ExecutableAllocator *executableAllocator);
-
-    using MacroAssembler = typename TargetConfiguration::MacroAssembler;
-    using RegisterID = typename MacroAssembler::RegisterID;
-    using FPRegisterID = typename MacroAssembler::FPRegisterID;
-    using Address = typename MacroAssembler::Address;
-    using Label = typename MacroAssembler::Label;
-    using Jump = typename MacroAssembler::Jump;
-    using DataLabelPtr = typename MacroAssembler::DataLabelPtr;
-    using TrustedImm32 = typename MacroAssembler::TrustedImm32;
-    using TrustedImm64 = typename MacroAssembler::TrustedImm64;
-    using TrustedImmPtr = typename MacroAssembler::TrustedImmPtr;
-    using RelationalCondition = typename MacroAssembler::RelationalCondition;
-    using typename MacroAssembler::DoubleCondition;
-    using MacroAssembler::label;
-    using MacroAssembler::move;
-    using MacroAssembler::jump;
-    using MacroAssembler::add32;
-    using MacroAssembler::and32;
-    using MacroAssembler::store32;
-    using MacroAssembler::loadPtr;
-    using MacroAssembler::load32;
-    using MacroAssembler::branch32;
-    using MacroAssembler::subDouble;
-    using MacroAssembler::subPtr;
-    using MacroAssembler::addPtr;
-    using MacroAssembler::call;
-    using MacroAssembler::poke;
-    using MacroAssembler::branchTruncateDoubleToUint32;
-    using MacroAssembler::or32;
-    using MacroAssembler::moveDouble;
-    using MacroAssembler::convertUInt32ToDouble;
-    using MacroAssembler::invert;
-    using MacroAssembler::convertInt32ToDouble;
-    using MacroAssembler::rshift32;
-    using MacroAssembler::storePtr;
-    using MacroAssembler::ret;
-
-    using JITTargetPlatform = typename TargetConfiguration::Platform;
-    using JITTargetPlatform::RegisterArgumentCount;
-    using JITTargetPlatform::StackSpaceAllocatedUponFunctionEntry;
-    using JITTargetPlatform::RegisterSize;
-    using JITTargetPlatform::StackAlignment;
-    using JITTargetPlatform::ReturnValueRegister;
-    using JITTargetPlatform::StackPointerRegister;
-    using JITTargetPlatform::ScratchRegister;
-    using JITTargetPlatform::EngineRegister;
-    using JITTargetPlatform::StackShadowSpace;
-    using JITTargetPlatform::registerForArgument;
-    using JITTargetPlatform::FPGpr0;
-    using JITTargetPlatform::platformEnterStandardStackFrame;
-    using JITTargetPlatform::platformFinishEnteringStandardStackFrame;
-    using JITTargetPlatform::platformLeaveStandardStackFrame;
-
-    static qint32 targetStructureOffset(qint32 hostOffset)
-    {
-        Q_ASSERT(hostOffset % QT_POINTER_SIZE == 0);
-        return (hostOffset * RegisterSize) / QT_POINTER_SIZE;
-    }
-
-    struct LookupCall {
-        Address addr;
-        uint getterSetterOffset;
-
-        LookupCall(const Address &addr, uint getterSetterOffset)
-            : addr(addr)
-            , getterSetterOffset(getterSetterOffset)
-        {}
-    };
-
-    struct RuntimeCall {
-        Address addr;
-
-        inline RuntimeCall(Runtime::RuntimeMethods method = Runtime::InvalidRuntimeMethod);
-        bool isValid() const { return addr.offset >= 0; }
-    };
-
-    // Explicit type to allow distinguishing between
-    // pushing an address itself or the value it points
-    // to onto the stack when calling functions.
-    struct Pointer : public Address
-    {
-        explicit Pointer(const Address& addr)
-            : Address(addr)
-        {}
-        explicit Pointer(RegisterID reg, int32_t offset)
-            : Address(reg, offset)
-        {}
-    };
-
-    using RegisterSizeDependentOps = RegisterSizeDependentAssembler<Assembler<TargetConfiguration>, MacroAssembler, JITTargetPlatform, RegisterSize>;
-    using ValueTypeInternal = typename RegisterSizeDependentOps::ValueTypeInternal;
-    using TargetPrimitive = typename RegisterSizeDependentOps::TargetPrimitive;
-
-    // V4 uses two stacks: one stack with QV4::Value items, which is checked by the garbage
-    // collector, and one stack used by the native C/C++/ABI code. This C++ stack is not scanned
-    // by the garbage collector, so if any JS object needs to be retained, it should be put on the
-    // JS stack.
-    //
-    // The "saved reg arg X" are on the C++ stack is used to store values in registers that need to
-    // be passed by reference to native functions. It is fine to use the C++ stack, because only
-    // non-object values can be stored in registers.
-    //
-    // Stack layout for the C++ stack:
-    //   return address
-    //   old FP                     <- FP
-    //   callee saved reg n
-    //   ...
-    //   callee saved reg 0
-    //   saved reg arg n
-    //   ...
-    //   saved reg arg 0            <- SP
-    //
-    // Stack layout for the JS stack:
-    //   function call argument n   <- LocalsRegister
-    //   ...
-    //   function call argument 0
-    //   local 0
-    //   ...
-    //   local n
-    class StackLayout
-    {
-    public:
-        StackLayout(IR::Function *function, int maxArgCountForBuiltins, int normalRegistersToSave, int fpRegistersToSave)
-            : normalRegistersToSave(normalRegistersToSave)
-            , fpRegistersToSave(fpRegistersToSave)
-            , maxOutgoingArgumentCount(function->maxNumberOfArguments)
-            , localCount(function->tempCount)
-            , savedRegCount(maxArgCountForBuiltins)
-        {
-#if 0 // debug code
-            qDebug("calleeSavedRegCount.....: %d",calleeSavedRegCount);
-            qDebug("maxOutgoingArgumentCount: %d",maxOutgoingArgumentCount);
-            qDebug("localCount..............: %d",localCount);
-            qDebug("savedConstCount.........: %d",savedRegCount);
-            for (int i = 0; i < maxOutgoingArgumentCount; ++i)
-                qDebug("argumentAddressForCall(%d) = 0x%x / -0x%x", i,
-                       argumentAddressForCall(i).offset, -argumentAddressForCall(i).offset);
-            for (int i = 0; i < localCount; ++i)
-                qDebug("local(%d) = 0x%x / -0x%x", i, stackSlotPointer(i).offset,
-                       -stackSlotPointer(i).offset);
-            qDebug("savedReg(0) = 0x%x / -0x%x", savedRegPointer(0).offset, -savedRegPointer(0).offset);
-            qDebug("savedReg(1) = 0x%x / -0x%x", savedRegPointer(1).offset, -savedRegPointer(1).offset);
-            qDebug("savedReg(2) = 0x%x / -0x%x", savedRegPointer(2).offset, -savedRegPointer(2).offset);
-            qDebug("savedReg(3) = 0x%x / -0x%x", savedRegPointer(3).offset, -savedRegPointer(3).offset);
-            qDebug("savedReg(4) = 0x%x / -0x%x", savedRegPointer(4).offset, -savedRegPointer(4).offset);
-            qDebug("savedReg(5) = 0x%x / -0x%x", savedRegPointer(5).offset, -savedRegPointer(5).offset);
-
-            qDebug("callDataAddress(0) = 0x%x", callDataAddress(0).offset);
-#endif
-        }
-
-        int calculateStackFrameSize() const
-        {
-            // sp was aligned before executing the call instruction. So, calculate all contents
-            // that were saved after that aligned stack...:
-            const int stackSpaceAllocatedOtherwise = StackSpaceAllocatedUponFunctionEntry
-                                                     + RegisterSize; // saved FramePointerRegister
-
-            // ... then calculate the stuff we want to store ...:
-            int frameSize = RegisterSize * normalRegistersToSave + sizeof(double) * fpRegistersToSave;
-            frameSize += savedRegCount * sizeof(QV4::Value); // (these get written out as Values, not as native registers)
-
-            Q_ASSERT(frameSize + stackSpaceAllocatedOtherwise < INT_MAX);
-            // .. then align that chunk ..:
-            frameSize = static_cast<int>(WTF::roundUpToMultipleOf(StackAlignment, frameSize + stackSpaceAllocatedOtherwise));
-            // ... which now holds our frame size + the extra stuff that was pushed due to the call.
-            // So subtract that extra stuff, and we have our frame size:
-            frameSize -= stackSpaceAllocatedOtherwise;
-
-            return frameSize;
-        }
-
-        /// \return the stack frame size in number of Value items.
-        int calculateJSStackFrameSize() const
-        {
-            return (localCount + sizeof(QV4::CallData)/sizeof(QV4::Value) - 1 + maxOutgoingArgumentCount) + 1;
-        }
-
-        Address stackSlotPointer(int idx) const
-        {
-            Q_ASSERT(idx >= 0);
-            Q_ASSERT(idx < localCount);
-
-            Pointer addr = callDataAddress(0);
-            addr.offset -= sizeof(QV4::Value) * (idx + 1);
-            return addr;
-        }
-
-        // Some run-time functions take (Value* args, int argc). This function is for populating
-        // the args.
-        Pointer argumentAddressForCall(int argument) const
-        {
-            Q_ASSERT(argument >= 0);
-            Q_ASSERT(argument < maxOutgoingArgumentCount);
-
-            const int index = maxOutgoingArgumentCount - argument;
-            return Pointer(Assembler::LocalsRegister, sizeof(QV4::Value) * (-index));
-        }
-
-        Pointer callDataAddress(int offset = 0) const {
-            return Pointer(Assembler::LocalsRegister, offset - (sizeof(QV4::CallData) + sizeof(QV4::Value) * (maxOutgoingArgumentCount - 1)));
-        }
-
-        Address savedRegPointer(int offset) const
-        {
-            Q_ASSERT(offset >= 0);
-            Q_ASSERT(offset < savedRegCount);
-
-            // Get the address of the bottom-most element of our frame:
-            Address ptr(Assembler::FramePointerRegister, -calculateStackFrameSize());
-            // This now is the element with offset 0. So:
-            ptr.offset += offset * sizeof(QV4::Value);
-            // and we're done!
-            return ptr;
-        }
-
-    private:
-        int normalRegistersToSave;
-        int fpRegistersToSave;
-
-        /// arg count for calls to JS functions
-        int maxOutgoingArgumentCount;
-
-        /// the number of spill slots needed by this function
-        int localCount;
-
-        /// used by built-ins to save arguments (e.g. constants) to the stack when they need to be
-        /// passed by reference.
-        int savedRegCount;
+    enum CallResultDestination {
+        IgnoreResult,
+        ResultInAccumulator,
     };
 
-    struct VoidType { VoidType() {} };
-    static const VoidType Void;
+    Assembler(const Value* constantTable);
+    ~Assembler();
+
+    // codegen infrastructure
+    void generatePrologue();
+    void generateEpilogue();
+    void link(Function *function);
+    void addLabel(int offset);
+
+    // loads/stores/moves
+    void loadConst(int constIndex);
+    void copyConst(int constIndex, int destReg);
+    void loadReg(int reg);
+    void storeReg(int reg);
+    void loadString(int stringId);
+    void loadValue(ReturnedValue value);
+
+    // numeric ops
+    void unot();
+    void toNumber();
+    void uminus();
+    void ucompl();
+    void inc();
+    void dec();
+    void add(int lhs);
+    void bitAnd(int lhs);
+    void bitOr(int lhs);
+    void bitXor(int lhs);
+    void ushr(int lhs);
+    void shr(int lhs);
+    void shl(int lhs);
+    void bitAndConst(int rhs);
+    void bitOrConst(int rhs);
+    void bitXorConst(int rhs);
+    void ushrConst(int rhs);
+    void shrConst(int rhs);
+    void shlConst(int rhs);
+    void mul(int lhs);
+    void div(int lhs);
+    void mod(int lhs);
+    void sub(int lhs);
+
+    // comparissons
+    void cmpeqNull();
+    void cmpneNull();
+    void cmpeqInt(int lhs);
+    void cmpneInt(int lhs);
+    void cmpeq(int lhs);
+    void cmpne(int lhs);
+    void cmpgt(int lhs);
+    void cmpge(int lhs);
+    void cmplt(int lhs);
+    void cmple(int lhs);
+    void cmpStrictEqual(int lhs);
+    void cmpStrictNotEqual(int lhs);
+
+    // jumps
+    void jump(int offset);
+    void jumpTrue(int offset);
+    void jumpFalse(int offset);
+    void jumpStrictEqualStackSlotInt(int lhs, int rhs, int offset);
+    void jumpStrictNotEqualStackSlotInt(int lhs, int rhs, int offset);
+
+    // stuff for runtime calls
+    void prepareCallWithArgCount(int argc);
+    void storeInstructionPointer(int instructionOffset);
+    void passAccumulatorAsArg(int arg);
+    void passFunctionAsArg(int arg);
+    void passEngineAsArg(int arg);
+    void passRegAsArg(int reg, int arg);
+    void passCppFrameAsArg(int arg);
+    void passInt32AsArg(int value, int arg);
+    void callRuntime(const char *functionName, const void *funcPtr, Assembler::CallResultDestination dest);
+    void saveAccumulatorInFrame();
+
+    // exception/context stuff
+    void checkException();
+    void gotoCatchException();
+    void getException();
+    void setException();
+    void setExceptionHandler(int offset);
+    void clearExceptionHandler();
+    void pushCatchContext(int name, int reg);
+    void popContext(int reg);
+
+    // other stuff
+    void ret();
+
+protected:
+    void *d;
 
-    typedef JSC::FunctionPtr FunctionPtr;
-
-#ifndef QT_NO_DEBUG
-    struct CallInfo {
-        Label label;
-        const char* functionName;
-    };
-#endif
-    struct PointerToValue {
-        PointerToValue(IR::Expr *value)
-            : value(value)
-        {}
-        IR::Expr *value;
-    };
-    struct StringToIndex {
-        explicit StringToIndex(const QString &string) : string(string) {}
-        QString string;
-    };
-    struct Reference {
-        Reference(IR::Expr *value) : value(value) {
-            Q_ASSERT(value->asTemp() || value->asArgLocal());
-        }
-        IR::Expr *value;
-    };
-
-    void callAbsolute(const char* /*functionName*/, const LookupCall &lookupCall)
-    {
-        call(lookupCall.addr);
-    }
-
-    void callAbsolute(const char *functionName, const RuntimeCall &runtimeCall)
-    {
-        call(runtimeCall.addr);
 #ifndef QT_NO_DEBUG
-        // the code below is to get proper function names in the disassembly
-        CallInfo info;
-        info.functionName = functionName;
-        info.label = label();
-        _callInfos.append(info);
-#else
-        Q_UNUSED(functionName)
+    enum { NoCall = -1 };
+    int remainingArgcForCall = NoCall;
 #endif
-    }
-
-    void registerBlock(IR::BasicBlock*, IR::BasicBlock *nextBlock);
-    IR::BasicBlock *nextBlock() const { return _nextBlock; }
-    void jumpToBlock(IR::BasicBlock* current, IR::BasicBlock *target);
-    void addPatch(IR::BasicBlock* targetBlock, Jump targetJump);
-    void addPatch(DataLabelPtr patch, Label target);
-    void addPatch(DataLabelPtr patch, IR::BasicBlock *target);
-    void generateCJumpOnNonZero(RegisterID reg, IR::BasicBlock *currentBlock,
-                             IR::BasicBlock *trueBlock, IR::BasicBlock *falseBlock);
-    void generateCJumpOnCompare(RelationalCondition cond, RegisterID left, TrustedImm32 right,
-                                IR::BasicBlock *currentBlock, IR::BasicBlock *trueBlock,
-                                IR::BasicBlock *falseBlock);
-    void generateCJumpOnCompare(RelationalCondition cond, RegisterID left, RegisterID right,
-                                IR::BasicBlock *currentBlock, IR::BasicBlock *trueBlock,
-                                IR::BasicBlock *falseBlock);
-    void generateCJumpOnUndefined(RelationalCondition cond, IR::Expr *right,
-                                  RegisterID scratchRegister, RegisterID tagRegister,
-                                  IR::BasicBlock *currentBlock, IR::BasicBlock *trueBlock,
-                                  IR::BasicBlock *falseBlock)
-    {
-        RegisterSizeDependentOps::generateCJumpOnUndefined(this, cond, right, scratchRegister, tagRegister,
-                                                           _nextBlock, currentBlock, trueBlock, falseBlock);
-    }
-
-    Jump generateIsDoubleCheck(RegisterID tagOrValueRegister)
-    {
-        return RegisterSizeDependentOps::generateIsDoubleCheck(this, tagOrValueRegister);
-    }
-
-    Jump genTryDoubleConversion(IR::Expr *src, FPRegisterID dest);
-    Jump branchDouble(bool invertCondition, IR::AluOp op, IR::Expr *left, IR::Expr *right);
-    Jump branchInt32(bool invertCondition, IR::AluOp op, IR::Expr *left, IR::Expr *right);
-
-    Pointer loadAddressForWriting(RegisterID tmp, IR::Expr *t, WriteBarrier::Type *barrier);
-    Pointer loadAddressForReading(RegisterID tmp, IR::Expr *t) {
-        return loadAddressForWriting(tmp, t, 0);
-    }
-
-    Pointer loadTempAddress(IR::Temp *t);
-    Pointer loadArgLocalAddressForWriting(RegisterID baseReg, IR::ArgLocal *al, WriteBarrier::Type *barrier);
-    Pointer loadArgLocalAddressForReading(RegisterID baseReg, IR::ArgLocal *al) {
-        return loadArgLocalAddressForWriting(baseReg, al, 0);
-    }
-    Pointer loadStringAddress(RegisterID reg, const QString &string);
-    Address loadConstant(IR::Const *c, RegisterID baseReg);
-    Address loadConstant(const TargetPrimitive &v, RegisterID baseReg);
-    void loadStringRef(RegisterID reg, const QString &string);
-    Pointer stackSlotPointer(IR::Temp *t) const
-    {
-        Q_ASSERT(t->kind == IR::Temp::StackSlot);
-
-        return Pointer(_stackLayout->stackSlotPointer(t->index));
-    }
-
-    template <int argumentNumber>
-    void saveOutRegister(PointerToValue arg)
-    {
-        if (!arg.value)
-            return;
-        if (IR::Temp *t = arg.value->asTemp()) {
-            if (t->kind == IR::Temp::PhysicalRegister) {
-                Pointer addr(_stackLayout->savedRegPointer(argumentNumber));
-                switch (t->type) {
-                case IR::BoolType:
-                    storeBool((RegisterID) t->index, addr, WriteBarrier::NoBarrier);
-                    break;
-                case IR::SInt32Type:
-                    storeInt32((RegisterID) t->index, addr, WriteBarrier::NoBarrier);
-                    break;
-                case IR::UInt32Type:
-                    storeUInt32((RegisterID) t->index, addr, WriteBarrier::NoBarrier);
-                    break;
-                case IR::DoubleType:
-                    storeDouble((FPRegisterID) t->index, addr, WriteBarrier::NoBarrier);
-                    break;
-                default:
-                    Q_UNIMPLEMENTED();
-                }
-            }
-        }
-    }
-
-    template <int, typename ArgType>
-    void saveOutRegister(ArgType)
-    {}
-
-    void loadArgumentInRegister(RegisterID source, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-
-        move(source, dest);
-    }
-
-    void loadArgumentInRegister(const Pointer& ptr, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-        addPtr(TrustedImm32(ptr.offset), ptr.base, dest);
-    }
-
-    void loadArgumentInRegister(PointerToValue temp, RegisterID dest, int argumentNumber)
-    {
-        if (!temp.value) {
-            RegisterSizeDependentOps::zeroRegister(this, dest);
-        } else {
-            Pointer addr = toAddress(dest, temp.value, argumentNumber, 0);
-            loadArgumentInRegister(addr, dest, argumentNumber);
-        }
-    }
-    void loadArgumentInRegister(StringToIndex temp, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-        loadStringRef(dest, temp.string);
-    }
-
-    void loadArgumentInRegister(Reference temp, RegisterID dest, int argumentNumber)
-    {
-        Q_ASSERT(temp.value);
-        Pointer addr = loadAddressForReading(dest, temp.value);
-        loadArgumentInRegister(addr, dest, argumentNumber);
-    }
-
-    void loadArgumentInRegister(IR::Temp* temp, RegisterID dest, int argumentNumber)
-    {
-        RegisterSizeDependentOps::loadArgumentInRegister(this, temp, dest, argumentNumber);
-    }
-
-    void loadArgumentInRegister(IR::ArgLocal* al, RegisterID dest, int argumentNumber)
-    {
-        RegisterSizeDependentOps::loadArgumentInRegister(this, al, dest, argumentNumber);
-    }
-
-    void loadArgumentInRegister(IR::Const* c, RegisterID dest, int argumentNumber)
-    {
-        RegisterSizeDependentOps::loadArgumentInRegister(this, c, dest, argumentNumber);
-    }
-
-    void loadArgumentInRegister(IR::Expr* expr, RegisterID dest, int argumentNumber)
-    {
-        RegisterSizeDependentOps::loadArgumentInRegister(this, expr, dest, argumentNumber);
-    }
-
-    void loadArgumentInRegister(TrustedImm32 imm32, RegisterID dest, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-
-        RegisterSizeDependentOps::zeroRegister(this, dest);
-        if (imm32.m_value)
-            move(imm32, dest);
-    }
-
-    void storeReturnValue(RegisterID dest, WriteBarrier::Type barrier = WriteBarrier::NoBarrier)
-    {
-        Q_UNUSED(barrier);
-        Q_ASSERT(barrier == WriteBarrier::NoBarrier);
-        move(ReturnValueRegister, dest);
-    }
-
-    void storeUInt32ReturnValue(RegisterID dest)
-    {
-        subPtr(TrustedImm32(sizeof(QV4::Value)), StackPointerRegister);
-        Pointer tmp(StackPointerRegister, 0);
-        storeReturnValue(tmp, WriteBarrier::NoBarrier);
-        toUInt32Register(tmp, dest);
-        addPtr(TrustedImm32(sizeof(QV4::Value)), StackPointerRegister);
-    }
-
-    void storeReturnValue(FPRegisterID dest)
-    {
-        RegisterSizeDependentOps::storeReturnValue(this, dest);
-    }
-
-    void storeReturnValue(const Pointer &dest, WriteBarrier::Type barrier)
-    {
-        RegisterSizeDependentOps::storeReturnValue(this, dest, barrier);
-    }
-
-    void storeReturnValue(IR::Expr *target)
-    {
-        if (!target)
-            return;
-
-        IR::Temp *temp = target->asTemp();
-        if (temp && temp->kind == IR::Temp::PhysicalRegister) {
-            if (temp->type == IR::DoubleType)
-                storeReturnValue((FPRegisterID) temp->index);
-            else if (temp->type == IR::UInt32Type)
-                storeUInt32ReturnValue((RegisterID) temp->index);
-            else
-                storeReturnValue((RegisterID) temp->index);
-            return;
-        } else {
-            WriteBarrier::Type barrier;
-            Pointer addr = loadAddressForWriting(ScratchRegister, target, &barrier);
-            storeReturnValue(addr, barrier);
-        }
-    }
+    int argcOnStackForCall = 0;
 
-    void storeReturnValue(VoidType)
-    {
-    }
-
-    template <int StackSlot>
-    void loadArgumentOnStack(RegisterID reg, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-
-        poke(reg, StackSlot);
-    }
-
-    template <int StackSlot>
-    void loadArgumentOnStack(TrustedImm32 value, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-
-        poke(value, StackSlot);
-    }
-
-    template <int StackSlot>
-    void loadArgumentOnStack(const Pointer& ptr, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-
-        addPtr(TrustedImm32(ptr.offset), ptr.base, ScratchRegister);
-        poke(ScratchRegister, StackSlot);
-    }
-
-    template <int StackSlot>
-    void loadArgumentOnStack(PointerToValue temp, int argumentNumber)
-    {
-        if (temp.value) {
-            Pointer ptr = toAddress(ScratchRegister, temp.value, argumentNumber, 0);
-            loadArgumentOnStack<StackSlot>(ptr, argumentNumber);
-        } else {
-            RegisterSizeDependentOps::zeroStackSlot(this, StackSlot);
-        }
-    }
-
-    template <int StackSlot>
-    void loadArgumentOnStack(StringToIndex temp, int argumentNumber)
-    {
-        Q_UNUSED(argumentNumber);
-        loadStringRef(ScratchRegister, temp.string);
-        poke(ScratchRegister, StackSlot);
-    }
-
-    template <int StackSlot>
-    void loadArgumentOnStack(Reference temp, int argumentNumber)
-    {
-        Q_ASSERT (temp.value);
-
-        Pointer ptr = loadAddressForReading(ScratchRegister, temp.value);
-        loadArgumentOnStack<StackSlot>(ptr, argumentNumber);
-    }
-
-    void loadDouble(IR::Expr *source, FPRegisterID dest)
-    {
-        IR::Temp *sourceTemp = source->asTemp();
-        if (sourceTemp && sourceTemp->kind == IR::Temp::PhysicalRegister) {
-            moveDouble((FPRegisterID) sourceTemp->index, dest);
-            return;
-        }
-        Pointer ptr = loadAddressForReading(ScratchRegister, source);
-        loadDouble(ptr, dest);
-    }
-
-    void storeDouble(FPRegisterID source, IR::Expr* target)
-    {
-        IR::Temp *targetTemp = target->asTemp();
-        if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister) {
-            moveDouble(source, (FPRegisterID) targetTemp->index);
-            return;
-        }
-        RegisterSizeDependentOps::storeDouble(this, source, target);
-    }
-
-    void loadDouble(Address addr, FPRegisterID dest)
-    {
-        RegisterSizeDependentOps::loadDouble(this, addr, dest);
-    }
-
-    void storeDouble(FPRegisterID source, Address addr, WriteBarrier::Type barrier)
-    {
-        RegisterSizeDependentOps::storeDouble(this, source, addr, barrier);
-    }
-
-    template <typename Result, typename Source>
-    void copyValue(Result result, Source source, WriteBarrier::Type barrier);
-    template <typename Result>
-    void copyValue(Result result, IR::Expr* source, WriteBarrier::Type barrier);
-
-    // The scratch register is used to calculate the temp address for the source.
-    void memcopyValue(Pointer target, IR::Expr *source, RegisterID scratchRegister, WriteBarrier::Type barrier)
-    {
-        Q_ASSERT(!source->asTemp() || source->asTemp()->kind != IR::Temp::PhysicalRegister);
-        Q_ASSERT(target.base != scratchRegister);
-        loadRawValue(loadAddressForReading(scratchRegister, source), FPGpr0);
-        storeRawValue(FPGpr0, target, barrier);
-    }
-
-    // The scratch register is used to calculate the temp address for the source.
-    void memcopyValue(IR::Expr *target, Pointer source, FPRegisterID fpScratchRegister, RegisterID scratchRegister)
-    {
-        loadRawValue(source, fpScratchRegister);
-        WriteBarrier::Type barrier;
-        Pointer dest = loadAddressForWriting(scratchRegister, target, &barrier);
-        storeRawValue(fpScratchRegister, dest, barrier);
-    }
-
-    void loadRawValue(Pointer source, FPRegisterID dest)
-    {
-        TargetConfiguration::MacroAssembler::loadDouble(source, dest);
-    }
-
-    void storeRawValue(FPRegisterID source, Pointer dest, WriteBarrier::Type barrier)
-    {
-        TargetConfiguration::MacroAssembler::storeDouble(source, dest);
-        if (WriteBarrier::isRequired<WriteBarrier::Unknown>() && barrier == WriteBarrier::Barrier)
-            RegisterSizeDependentOps::emitWriteBarrier(this, dest);
-    }
-
-    void storeValue(TargetPrimitive value, Address destination, WriteBarrier::Type barrier)
-    {
-        RegisterSizeDependentOps::storeValue(this, value, destination, barrier);
-    }
-
-    void storeValue(TargetPrimitive value, IR::Expr* temp);
-
-    void emitWriteBarrier(Address addr, WriteBarrier::Type barrier) {
-        if (WriteBarrier::isRequired<WriteBarrier::Primitive>() && barrier == WriteBarrier::Barrier)
-            RegisterSizeDependentOps::emitWriteBarrier(this, addr);
-    }
-
-    void enterStandardStackFrame(const RegisterInformation &regularRegistersToSave,
-                                 const RegisterInformation &fpRegistersToSave);
-    void leaveStandardStackFrame(const RegisterInformation &regularRegistersToSave,
-                                 const RegisterInformation &fpRegistersToSave);
-
-    void checkException() {
-        this->load8(Address(EngineRegister, targetStructureOffset(offsetof(QV4::EngineBase, hasException))), ScratchRegister);
-        Jump exceptionThrown = branch32(RelationalCondition::NotEqual, ScratchRegister, TrustedImm32(0));
-        if (catchBlock)
-            addPatch(catchBlock, exceptionThrown);
-        else
-            exceptionPropagationJumps.append(exceptionThrown);
-    }
-    void jumpToExceptionHandler() {
-        Jump exceptionThrown = jump();
-        if (catchBlock)
-            addPatch(catchBlock, exceptionThrown);
-        else
-            exceptionPropagationJumps.append(exceptionThrown);
-    }
-
-    template <int argumentNumber, typename T>
-    void loadArgumentOnStackOrRegister(const T &value)
-    {
-        if (argumentNumber < RegisterArgumentCount)
-            loadArgumentInRegister(value, registerForArgument(argumentNumber), argumentNumber);
-        else
-            loadArgumentOnStack<argumentNumber - RegisterArgumentCount + (StackShadowSpace / RegisterSize)>(value, argumentNumber);
-    }
-
-    template <int argumentNumber>
-    void loadArgumentOnStackOrRegister(const VoidType &value)
-    {
-        Q_UNUSED(value);
-    }
-
-    template <bool selectFirst, int First, int Second>
-    struct Select
-    {
-        enum { Chosen = First };
-    };
-
-    template <int First, int Second>
-    struct Select<false, First, Second>
-    {
-        enum { Chosen = Second };
-    };
-
-    template <int ArgumentIndex, typename Parameter>
-    struct SizeOnStack
-    {
-        enum { Size = Select<ArgumentIndex >= RegisterArgumentCount, RegisterSize, 0>::Chosen };
-    };
-
-    template <int ArgumentIndex>
-    struct SizeOnStack<ArgumentIndex, VoidType>
-    {
-        enum { Size = 0 };
-    };
-
-    template <typename T> bool prepareCall(T &)
-    { return true; }
-
-    bool prepareCall(LookupCall &lookupCall)
-    {
-        // IMPORTANT! See generateLookupCall in qv4isel_masm_p.h for details!
-
-        // load the table from the context
-        loadPtr(Address(EngineRegister, targetStructureOffset(offsetof(QV4::EngineBase, current))), ScratchRegister);
-        loadPtr(Address(ScratchRegister, targetStructureOffset(Heap::ExecutionContextData::baseOffset + offsetof(Heap::ExecutionContextData, lookups))),
-                    lookupCall.addr.base);
-        // pre-calculate the indirect address for the lookupCall table:
-        if (lookupCall.addr.offset)
-            addPtr(TrustedImm32(lookupCall.addr.offset), lookupCall.addr.base);
-        // store it as the first argument
-        loadArgumentOnStackOrRegister<0>(lookupCall.addr.base);
-        // set the destination addresses offset to the getterSetterOffset. The base is the lookupCall table's address
-        lookupCall.addr.offset = lookupCall.getterSetterOffset;
-        return false;
-    }
-
-    template <typename ArgRet, typename Callable, typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5, typename Arg6>
-    void generateFunctionCallImp(bool needsExceptionCheck, ArgRet r, const char* functionName, Callable function, Arg1 arg1, Arg2 arg2, Arg3 arg3, Arg4 arg4, Arg5 arg5, Arg6 arg6)
-    {
-        int stackSpaceNeeded =   SizeOnStack<0, Arg1>::Size
-                               + SizeOnStack<1, Arg2>::Size
-                               + SizeOnStack<2, Arg3>::Size
-                               + SizeOnStack<3, Arg4>::Size
-                               + SizeOnStack<4, Arg5>::Size
-                               + SizeOnStack<5, Arg6>::Size
-                               + StackShadowSpace;
-
-        if (stackSpaceNeeded) {
-            Q_ASSERT(stackSpaceNeeded < (INT_MAX - StackAlignment));
-            stackSpaceNeeded = static_cast<int>(WTF::roundUpToMultipleOf(StackAlignment, stackSpaceNeeded));
-            subPtr(TrustedImm32(stackSpaceNeeded), StackPointerRegister);
-        }
-
-        // First save any arguments that reside in registers, because they could be overwritten
-        // if that register is also used to pass arguments.
-        saveOutRegister<5>(arg6);
-        saveOutRegister<4>(arg5);
-        saveOutRegister<3>(arg4);
-        saveOutRegister<2>(arg3);
-        saveOutRegister<1>(arg2);
-        saveOutRegister<0>(arg1);
-
-        loadArgumentOnStackOrRegister<5>(arg6);
-        loadArgumentOnStackOrRegister<4>(arg5);
-        loadArgumentOnStackOrRegister<3>(arg4);
-        loadArgumentOnStackOrRegister<2>(arg3);
-        loadArgumentOnStackOrRegister<1>(arg2);
-
-        if (prepareCall(function))
-            loadArgumentOnStackOrRegister<0>(arg1);
-
-        if (JITTargetPlatform::gotRegister != -1)
-            load32(Address(JITTargetPlatform::FramePointerRegister, JITTargetPlatform::savedGOTRegisterSlotOnStack()), static_cast<RegisterID>(JITTargetPlatform::gotRegister)); // restore the GOT ptr
-
-        callAbsolute(functionName, function);
-
-        if (stackSpaceNeeded)
-            addPtr(TrustedImm32(stackSpaceNeeded), StackPointerRegister);
-
-        if (needsExceptionCheck) {
-            checkException();
-        }
-
-        storeReturnValue(r);
-
-    }
-
-    template <typename ArgRet, typename Callable, typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5>
-    void generateFunctionCallImp(bool needsExceptionCheck, ArgRet r, const char* functionName, Callable function, Arg1 arg1, Arg2 arg2, Arg3 arg3, Arg4 arg4, Arg5 arg5)
-    {
-        generateFunctionCallImp(needsExceptionCheck, r, functionName, function, arg1, arg2, arg3, arg4, arg5, VoidType());
-    }
-
-    template <typename ArgRet, typename Callable, typename Arg1, typename Arg2, typename Arg3, typename Arg4>
-    void generateFunctionCallImp(bool needsExceptionCheck, ArgRet r, const char* functionName, Callable function, Arg1 arg1, Arg2 arg2, Arg3 arg3, Arg4 arg4)
-    {
-        generateFunctionCallImp(needsExceptionCheck, r, functionName, function, arg1, arg2, arg3, arg4, VoidType(), VoidType());
-    }
-
-    template <typename ArgRet, typename Callable, typename Arg1, typename Arg2, typename Arg3>
-    void generateFunctionCallImp(bool needsExceptionCheck, ArgRet r, const char* functionName, Callable function, Arg1 arg1, Arg2 arg2, Arg3 arg3)
-    {
-        generateFunctionCallImp(needsExceptionCheck, r, functionName, function, arg1, arg2, arg3, VoidType(), VoidType(), VoidType());
-    }
-
-    template <typename ArgRet, typename Callable, typename Arg1, typename Arg2>
-    void generateFunctionCallImp(bool needsExceptionCheck, ArgRet r, const char* functionName, Callable function, Arg1 arg1, Arg2 arg2)
-    {
-        generateFunctionCallImp(needsExceptionCheck, r, functionName, function, arg1, arg2, VoidType(), VoidType(), VoidType(), VoidType());
-    }
-
-    template <typename ArgRet, typename Callable, typename Arg1>
-    void generateFunctionCallImp(bool needsExceptionCheck, ArgRet r, const char* functionName, Callable function, Arg1 arg1)
-    {
-        generateFunctionCallImp(needsExceptionCheck, r, functionName, function, arg1, VoidType(), VoidType(), VoidType(), VoidType(), VoidType());
-    }
-
-    Pointer toAddress(RegisterID tmpReg, IR::Expr *e, int offset, WriteBarrier::Type *barrier)
-    {
-        if (barrier)
-            *barrier = WriteBarrier::NoBarrier;
-        if (IR::Const *c = e->asConst()) {
-            Address addr = _stackLayout->savedRegPointer(offset);
-            Address tagAddr = addr;
-            tagAddr.offset += 4;
-
-            auto v = convertToValue<TargetPrimitive>(c);
-            store32(TrustedImm32(v.value()), addr);
-            store32(TrustedImm32(v.tag()), tagAddr);
-            return Pointer(addr);
-        }
-
-        if (IR::Temp *t = e->asTemp())
-            if (t->kind == IR::Temp::PhysicalRegister)
-                return Pointer(_stackLayout->savedRegPointer(offset));
-
-        return loadAddressForWriting(tmpReg, e, barrier);
-    }
-
-    void storeBool(RegisterID reg, Pointer addr, WriteBarrier::Type barrier)
-    {
-        store32(reg, addr);
-        addr.offset += 4;
-        store32(TrustedImm32(TargetPrimitive::fromBoolean(0).tag()), addr);
-        if (WriteBarrier::isRequired<WriteBarrier::Primitive>() && barrier == WriteBarrier::Barrier)
-            RegisterSizeDependentOps::emitWriteBarrier(this, addr);
-    }
-
-    void storeBool(RegisterID src, RegisterID dest)
-    {
-        move(src, dest);
-    }
-
-    void storeBool(RegisterID reg, IR::Expr *target)
-    {
-        if (IR::Temp *targetTemp = target->asTemp()) {
-            if (targetTemp->kind == IR::Temp::PhysicalRegister) {
-                move(reg, (RegisterID) targetTemp->index);
-                return;
-            }
-        }
-
-        WriteBarrier::Type barrier;
-        Pointer addr = loadAddressForWriting(ScratchRegister, target, &barrier);
-        storeBool(reg, addr, barrier);
-    }
-
-    void storeBool(bool value, IR::Expr *target) {
-        TrustedImm32 trustedValue(value ? 1 : 0);
-
-        if (IR::Temp *targetTemp = target->asTemp()) {
-            if (targetTemp->kind == IR::Temp::PhysicalRegister) {
-                move(trustedValue, (RegisterID) targetTemp->index);
-                return;
-            }
-        }
-
-        move(trustedValue, ScratchRegister);
-        storeBool(ScratchRegister, target);
-    }
-
-    void storeInt32(RegisterID src, RegisterID dest)
-    {
-        move(src, dest);
-    }
-
-    void storeInt32(RegisterID reg, Pointer addr, WriteBarrier::Type barrier)
-    {
-        store32(reg, addr);
-        addr.offset += 4;
-        store32(TrustedImm32(TargetPrimitive::fromInt32(0).tag()), addr);
-        if (WriteBarrier::isRequired<WriteBarrier::Primitive>() && barrier == WriteBarrier::Barrier)
-            RegisterSizeDependentOps::emitWriteBarrier(this, addr);
-    }
-
-    void storeInt32(RegisterID reg, IR::Expr *target)
-    {
-        IR::Temp *targetTemp = target->asTemp();
-        if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister) {
-            move(reg, (RegisterID) targetTemp->index);
-        } else {
-            WriteBarrier::Type barrier;
-            Pointer addr = loadAddressForWriting(ScratchRegister, target, &barrier);
-            storeInt32(reg, addr, barrier);
-        }
-    }
-
-    void storeUInt32(RegisterID src, RegisterID dest)
-    {
-        move(src, dest);
-    }
-
-    void storeUInt32(RegisterID reg, Pointer addr, WriteBarrier::Type barrier)
-    {
-        // The UInt32 representation in QV4::Value is really convoluted. See also toUInt32Register.
-        Jump intRange = branch32(RelationalCondition::GreaterThanOrEqual, reg, TrustedImm32(0));
-        convertUInt32ToDouble(reg, FPGpr0, ReturnValueRegister);
-        storeDouble(FPGpr0, addr, barrier);
-        Jump done = jump();
-        intRange.link(this);
-        storeInt32(reg, addr, barrier);
-        done.link(this);
-    }
-
-    void storeUInt32(RegisterID reg, IR::Expr *target)
-    {
-        IR::Temp *targetTemp = target->asTemp();
-        if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister) {
-            move(reg, (RegisterID) targetTemp->index);
-        } else {
-            WriteBarrier::Type barrier;
-            Pointer addr = loadAddressForWriting(ScratchRegister, target, &barrier);
-            storeUInt32(reg, addr, barrier);
-        }
-    }
-
-    FPRegisterID toDoubleRegister(IR::Expr *e, FPRegisterID target = FPGpr0)
-    {
-        if (IR::Const *c = e->asConst()) {
-            RegisterSizeDependentOps::loadDoubleConstant(this, c, target);
-            return target;
-        }
-
-        if (IR::Temp *t = e->asTemp())
-            if (t->kind == IR::Temp::PhysicalRegister)
-                return (FPRegisterID) t->index;
-
-        loadDouble(e, target);
-        return target;
-    }
-
-    RegisterID toBoolRegister(IR::Expr *e, RegisterID scratchReg)
-    {
-        return toInt32Register(e, scratchReg);
-    }
-
-    RegisterID toInt32Register(IR::Expr *e, RegisterID scratchReg)
-    {
-        if (IR::Const *c = e->asConst()) {
-            move(TrustedImm32(convertToValue<Primitive>(c).int_32()), scratchReg);
-            return scratchReg;
-        }
-
-        if (IR::Temp *t = e->asTemp())
-            if (t->kind == IR::Temp::PhysicalRegister)
-                return (RegisterID) t->index;
-
-        return toInt32Register(loadAddressForReading(scratchReg, e), scratchReg);
-    }
-
-    RegisterID toInt32Register(Pointer addr, RegisterID scratchReg)
-    {
-        load32(addr, scratchReg);
-        return scratchReg;
-    }
-
-    RegisterID toUInt32Register(IR::Expr *e, RegisterID scratchReg)
-    {
-        if (IR::Const *c = e->asConst()) {
-            move(TrustedImm32(unsigned(c->value)), scratchReg);
-            return scratchReg;
-        }
-
-        if (IR::Temp *t = e->asTemp())
-            if (t->kind == IR::Temp::PhysicalRegister)
-                return (RegisterID) t->index;
-
-        return toUInt32Register(loadAddressForReading(scratchReg, e), scratchReg);
-    }
-
-    RegisterID toUInt32Register(Pointer addr, RegisterID scratchReg)
-    {
-        Q_ASSERT(addr.base != scratchReg);
-
-        // The UInt32 representation in QV4::Value is really convoluted. See also storeUInt32.
-        Pointer tagAddr = addr;
-        tagAddr.offset += 4;
-        load32(tagAddr, scratchReg);
-        Jump inIntRange = branch32(RelationalCondition::Equal, scratchReg, TrustedImm32(quint32(ValueTypeInternal::Integer)));
-
-        // it's not in signed int range, so load it as a double, and truncate it down
-        loadDouble(addr, FPGpr0);
-        Address inversionAddress = loadConstant(TargetPrimitive::fromDouble(double(INT_MAX) + 1), scratchReg);
-        subDouble(inversionAddress, FPGpr0);
-        Jump canNeverHappen = branchTruncateDoubleToUint32(FPGpr0, scratchReg);
-        canNeverHappen.link(this);
-        or32(TrustedImm32(1 << 31), scratchReg);
-        Jump done = jump();
-
-        inIntRange.link(this);
-        load32(addr, scratchReg);
-
-        done.link(this);
-        return scratchReg;
-    }
-
-    void returnFromFunction(IR::Ret *s, RegisterInformation regularRegistersToSave, RegisterInformation fpRegistersToSave);
-
-    JSC::MacroAssemblerCodeRef link(int *codeSize);
-
-    void setStackLayout(int maxArgCountForBuiltins, int regularRegistersToSave, int fpRegistersToSave);
-    const StackLayout &stackLayout() const { return *_stackLayout.data(); }
-    void initializeLocalVariables()
-    {
-        const int locals = _stackLayout->calculateJSStackFrameSize();
-        if (locals <= 0)
-            return;
-        loadPtr(Address(JITTargetPlatform::EngineRegister, targetStructureOffset(offsetof(EngineBase, jsStackTop))), JITTargetPlatform::LocalsRegister);
-        RegisterSizeDependentOps::initializeLocalVariables(this, locals);
-        storePtr(JITTargetPlatform::LocalsRegister, Address(JITTargetPlatform::EngineRegister, targetStructureOffset(offsetof(EngineBase, jsStackTop))));
-    }
-
-    Label exceptionReturnLabel;
-    IR::BasicBlock * catchBlock;
-    QVector<Jump> exceptionPropagationJumps;
 private:
-    QScopedPointer<const StackLayout> _stackLayout;
-    IR::Function *_function;
-    std::vector<Label> _addrs;
-    std::vector<std::vector<Jump>> _patches;
-#ifndef QT_NO_DEBUG
-    QVector<CallInfo> _callInfos;
-#endif
-
-    struct DataLabelPatch {
-        DataLabelPtr dataLabel;
-        Label target;
-    };
-    std::vector<DataLabelPatch> _dataLabelPatches;
-
-    std::vector<std::vector<DataLabelPtr>> _labelPatches;
-    IR::BasicBlock *_nextBlock;
-
-    QV4::ExecutableAllocator *_executableAllocator;
-    QV4::Compiler::JSUnitGenerator *_jsGenerator;
+    typedef unsigned(*CmpFunc)(const Value&,const Value&);
+    void cmp(int cond, CmpFunc function, const char *functionName, int lhs);
+    void passAccumulatorAsArg_internal(int arg, bool push);
 };
 
-template <typename TargetConfiguration>
-const typename Assembler<TargetConfiguration>::VoidType Assembler<TargetConfiguration>::Void;
-
-template <typename TargetConfiguration>
-template <typename Result, typename Source>
-void Assembler<TargetConfiguration>::copyValue(Result result, Source source, WriteBarrier::Type barrier)
-{
-    RegisterSizeDependentOps::copyValueViaRegisters(this, source, result, barrier);
-}
-
-template <typename TargetConfiguration>
-template <typename Result>
-void Assembler<TargetConfiguration>::copyValue(Result result, IR::Expr* source, WriteBarrier::Type barrier)
-{
-    if (source->type == IR::BoolType) {
-        RegisterID reg = toInt32Register(source, ScratchRegister);
-        storeBool(reg, result, barrier);
-    } else if (source->type == IR::SInt32Type) {
-        RegisterID reg = toInt32Register(source, ScratchRegister);
-        storeInt32(reg, result, barrier);
-    } else if (source->type == IR::UInt32Type) {
-        RegisterID reg = toUInt32Register(source, ScratchRegister);
-        storeUInt32(reg, result, barrier);
-    } else if (source->type == IR::DoubleType) {
-        storeDouble(toDoubleRegister(source), result, barrier);
-    } else if (source->asTemp() || source->asArgLocal()) {
-        RegisterSizeDependentOps::copyValueViaRegisters(this, source, result, barrier);
-    } else if (IR::Const *c = source->asConst()) {
-        auto v = convertToValue<TargetPrimitive>(c);
-        storeValue(v, result, barrier);
-    } else {
-        Q_UNREACHABLE();
-    }
-}
-
-template <typename TargetConfiguration>
-inline Assembler<TargetConfiguration>::RuntimeCall::RuntimeCall(Runtime::RuntimeMethods method)
-    : addr(Assembler::EngineRegister,
-           method == Runtime::InvalidRuntimeMethod ? -1 : (Assembler<TargetConfiguration>::targetStructureOffset(offsetof(EngineBase, runtime) + Runtime::runtimeMethodOffset(method))))
-{
-}
-
-} // end of namespace JIT
-} // end of namespace QV4
+} // namespace JIT
+} // namespace QV4
 
 QT_END_NAMESPACE
 
-#endif // ENABLE(ASSEMBLER)
-
-#endif // QV4ISEL_MASM_P_H
+#endif // QV4ASSEMBLER_P_H
diff --git a/src/qml/jit/qv4binop.cpp b/src/qml/jit/qv4binop.cpp
deleted file mode 100644
index a1c65f644c..0000000000
--- a/src/qml/jit/qv4binop.cpp
+++ /dev/null
@@ -1,665 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-#include <qv4binop_p.h>
-#include <qv4assembler_p.h>
-
-#if ENABLE(ASSEMBLER)
-
-QT_BEGIN_NAMESPACE
-
-namespace QV4 {
-namespace JIT {
-
-template <typename JITAssembler>
-struct ArchitectureSpecificBinaryOperation
-{
-    using FPRegisterID = typename JITAssembler::FPRegisterID;
-
-    static bool doubleAdd(JITAssembler *as, IR::Expr *lhs, IR::Expr *rhs, FPRegisterID targetReg)
-    {
-        Q_UNUSED(as);
-        Q_UNUSED(lhs);
-        Q_UNUSED(rhs);
-        Q_UNUSED(targetReg);
-        return false;
-    }
-    static bool doubleMul(JITAssembler *as, IR::Expr *lhs, IR::Expr *rhs, FPRegisterID targetReg)
-    {
-        Q_UNUSED(as);
-        Q_UNUSED(lhs);
-        Q_UNUSED(rhs);
-        Q_UNUSED(targetReg);
-        return false;
-    }
-    static bool doubleSub(JITAssembler *as, IR::Expr *lhs, IR::Expr *rhs, FPRegisterID targetReg)
-    {
-        Q_UNUSED(as);
-        Q_UNUSED(lhs);
-        Q_UNUSED(rhs);
-        Q_UNUSED(targetReg);
-        return false;
-    }
-    static bool doubleDiv(JITAssembler *as, IR::Expr *lhs, IR::Expr *rhs, FPRegisterID targetReg)
-    {
-        Q_UNUSED(as);
-        Q_UNUSED(lhs);
-        Q_UNUSED(rhs);
-        Q_UNUSED(targetReg);
-        return false;
-    }
-};
-
-#if CPU(X86)
-template <>
-struct ArchitectureSpecificBinaryOperation<Assembler<AssemblerTargetConfiguration<JSC::MacroAssemblerX86, NoOperatingSystemSpecialization>>>
-{
-    using JITAssembler = Assembler<AssemblerTargetConfiguration<JSC::MacroAssemblerX86, NoOperatingSystemSpecialization>>;
-    using FPRegisterID = JITAssembler::FPRegisterID;
-    using Address = JITAssembler::Address;
-
-    static bool doubleAdd(JITAssembler *as, IR::Expr *lhs, IR::Expr *rhs, FPRegisterID targetReg)
-    {
-        if (IR::Const *c = rhs->asConst()) { // Y = X + constant -> Y = X; Y += [constant-address]
-            as->moveDouble(as->toDoubleRegister(lhs, targetReg), targetReg);
-            Address addr = as->loadConstant(c, JITAssembler::ScratchRegister);
-            as->addDouble(addr, targetReg);
-            return true;
-        }
-        if (IR::Temp *t = rhs->asTemp()) { // Y = X + [temp-memory-address] -> Y = X; Y += [temp-memory-address]
-            if (t->kind != IR::Temp::PhysicalRegister) {
-                as->moveDouble(as->toDoubleRegister(lhs, targetReg), targetReg);
-                as->addDouble(as->loadTempAddress(t), targetReg);
-                return true;
-            }
-        }
-        return false;
-    }
-    static bool doubleMul(JITAssembler *as, IR::Expr *lhs, IR::Expr *rhs, FPRegisterID targetReg)
-    {
-        if (IR::Const *c = rhs->asConst()) { // Y = X * constant -> Y = X; Y *= [constant-address]
-            as->moveDouble(as->toDoubleRegister(lhs, targetReg), targetReg);
-            Address addr = as->loadConstant(c, JITAssembler::ScratchRegister);
-            as->mulDouble(addr, targetReg);
-            return true;
-        }
-        if (IR::Temp *t = rhs->asTemp()) { // Y = X * [temp-memory-address] -> Y = X; Y *= [temp-memory-address]
-            if (t->kind != IR::Temp::PhysicalRegister) {
-                as->moveDouble(as->toDoubleRegister(lhs, targetReg), targetReg);
-                as->mulDouble(as->loadTempAddress(t), targetReg);
-                return true;
-            }
-        }
-        return false;
-    }
-    static bool doubleSub(JITAssembler *as, IR::Expr *lhs, IR::Expr *rhs, FPRegisterID targetReg)
-    {
-        if (IR::Const *c = rhs->asConst()) { // Y = X - constant -> Y = X; Y -= [constant-address]
-            as->moveDouble(as->toDoubleRegister(lhs, targetReg), targetReg);
-            Address addr = as->loadConstant(c, JITAssembler::ScratchRegister);
-            as->subDouble(addr, targetReg);
-            return true;
-        }
-        if (IR::Temp *t = rhs->asTemp()) { // Y = X - [temp-memory-address] -> Y = X; Y -= [temp-memory-address]
-            if (t->kind != IR::Temp::PhysicalRegister) {
-                as->moveDouble(as->toDoubleRegister(lhs, targetReg), targetReg);
-                as->subDouble(as->loadTempAddress(t), targetReg);
-                return true;
-            }
-        }
-        return false;
-    }
-    static bool doubleDiv(JITAssembler *as, IR::Expr *lhs, IR::Expr *rhs, FPRegisterID targetReg)
-    {
-        if (IR::Const *c = rhs->asConst()) { // Y = X / constant -> Y = X; Y /= [constant-address]
-            as->moveDouble(as->toDoubleRegister(lhs, targetReg), targetReg);
-            Address addr = as->loadConstant(c, JITAssembler::ScratchRegister);
-            as->divDouble(addr, targetReg);
-            return true;
-        }
-        if (IR::Temp *t = rhs->asTemp()) { // Y = X / [temp-memory-address] -> Y = X; Y /= [temp-memory-address]
-            if (t->kind != IR::Temp::PhysicalRegister) {
-                as->moveDouble(as->toDoubleRegister(lhs, targetReg), targetReg);
-                as->divDouble(as->loadTempAddress(t), targetReg);
-                return true;
-            }
-        }
-        return false;
-    }
-};
-#endif
-
-#define OP(op) \
-    { "Runtime::" isel_stringIfy(op), QV4::Runtime::op, QV4::Runtime::InvalidRuntimeMethod, 0, 0, QV4::Runtime::Method_##op##_NeedsExceptionCheck }
-#define OPCONTEXT(op) \
-    { "Runtime::" isel_stringIfy(op), QV4::Runtime::InvalidRuntimeMethod, QV4::Runtime::op, 0, 0, QV4::Runtime::Method_##op##_NeedsExceptionCheck }
-
-#define INLINE_OP(op, memOp, immOp) \
-    { "Runtime::" isel_stringIfy(op), QV4::Runtime::op, QV4::Runtime::InvalidRuntimeMethod, memOp, immOp, QV4::Runtime::Method_##op##_NeedsExceptionCheck }
-#define INLINE_OPCONTEXT(op, memOp, immOp) \
-    { "Runtime::" isel_stringIfy(op), QV4::Runtime::InvalidRuntimeMethod, QV4::Runtime::op, memOp, immOp, QV4::Runtime::Method_##op##_NeedsExceptionCheck }
-
-#define NULL_OP \
-    { 0, QV4::Runtime::InvalidRuntimeMethod, QV4::Runtime::InvalidRuntimeMethod, 0, 0, false }
-
-template <typename JITAssembler>
-const typename Binop<JITAssembler>::OpInfo Binop<JITAssembler>::operations[IR::LastAluOp + 1] = {
-    NULL_OP, // OpInvalid
-    NULL_OP, // OpIfTrue
-    NULL_OP, // OpNot
-    NULL_OP, // OpUMinus
-    NULL_OP, // OpUPlus
-    NULL_OP, // OpCompl
-    NULL_OP, // OpIncrement
-    NULL_OP, // OpDecrement
-
-    INLINE_OP(bitAnd, &Binop<JITAssembler>::inline_and32, &Binop<JITAssembler>::inline_and32), // OpBitAnd
-    INLINE_OP(bitOr, &Binop<JITAssembler>::inline_or32, &Binop<JITAssembler>::inline_or32), // OpBitOr
-    INLINE_OP(bitXor, &Binop<JITAssembler>::inline_xor32, &Binop<JITAssembler>::inline_xor32), // OpBitXor
-
-    INLINE_OPCONTEXT(add, &Binop<JITAssembler>::inline_add32, &Binop<JITAssembler>::inline_add32), // OpAdd
-    INLINE_OP(sub, &Binop<JITAssembler>::inline_sub32, &Binop<JITAssembler>::inline_sub32), // OpSub
-    INLINE_OP(mul, &Binop<JITAssembler>::inline_mul32, &Binop<JITAssembler>::inline_mul32), // OpMul
-
-    OP(div), // OpDiv
-    OP(mod), // OpMod
-
-    INLINE_OP(shl, &Binop<JITAssembler>::inline_shl32, &Binop<JITAssembler>::inline_shl32), // OpLShift
-    INLINE_OP(shr, &Binop<JITAssembler>::inline_shr32, &Binop<JITAssembler>::inline_shr32), // OpRShift
-    INLINE_OP(ushr, &Binop<JITAssembler>::inline_ushr32, &Binop<JITAssembler>::inline_ushr32), // OpURShift
-
-    OP(greaterThan), // OpGt
-    OP(lessThan), // OpLt
-    OP(greaterEqual), // OpGe
-    OP(lessEqual), // OpLe
-    OP(equal), // OpEqual
-    OP(notEqual), // OpNotEqual
-    OP(strictEqual), // OpStrictEqual
-    OP(strictNotEqual), // OpStrictNotEqual
-
-    OPCONTEXT(instanceof), // OpInstanceof
-    OPCONTEXT(in), // OpIn
-
-    NULL_OP, // OpAnd
-    NULL_OP // OpOr
-};
-
-
-
-template <typename JITAssembler>
-void Binop<JITAssembler>::generate(IR::Expr *lhs, IR::Expr *rhs, IR::Expr *target)
-{
-    if (op != IR::OpMod
-            && lhs->type == IR::DoubleType && rhs->type == IR::DoubleType) {
-        doubleBinop(lhs, rhs, target);
-        return;
-    }
-    if (lhs->type == IR::SInt32Type && rhs->type == IR::SInt32Type) {
-        if (int32Binop(lhs, rhs, target))
-            return;
-    }
-
-    Jump done;
-    if (lhs->type != IR::StringType && rhs->type != IR::StringType)
-        done = genInlineBinop(lhs, rhs, target);
-
-    // TODO: inline var===null and var!==null
-    Binop::OpInfo info = Binop::operation(op);
-
-    if (op == IR::OpAdd &&
-            (lhs->type == IR::StringType || rhs->type == IR::StringType)) {
-        const Binop::OpInfo stringAdd = OPCONTEXT(addString);
-        info = stringAdd;
-    }
-
-    typename JITAssembler::RuntimeCall fallBack(info.fallbackImplementation);
-    typename JITAssembler::RuntimeCall context(info.contextImplementation);
-    if (fallBack.isValid()) {
-        as->generateFunctionCallImp(info.needsExceptionCheck, target, info.name, fallBack,
-                                     PointerToValue(lhs),
-                                     PointerToValue(rhs));
-    } else if (context.isValid()) {
-        as->generateFunctionCallImp(info.needsExceptionCheck, target, info.name, context,
-                                     JITAssembler::EngineRegister,
-                                     PointerToValue(lhs),
-                                     PointerToValue(rhs));
-    } else {
-        Q_ASSERT(!"unreachable");
-    }
-
-    if (done.isSet())
-        done.link(as);
-
-}
-
-template <typename JITAssembler>
-void Binop<JITAssembler>::doubleBinop(IR::Expr *lhs, IR::Expr *rhs, IR::Expr *target)
-{
-    IR::Temp *targetTemp = target->asTemp();
-    FPRegisterID targetReg;
-    if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister)
-        targetReg = (FPRegisterID) targetTemp->index;
-    else
-        targetReg = JITAssembler::FPGpr0;
-
-    switch (op) {
-    case IR::OpAdd:
-        if (lhs->asConst())
-            std::swap(lhs, rhs); // Y = constant + X -> Y = X + constant
-
-        if (ArchitectureSpecificBinaryOperation<JITAssembler>::doubleAdd(as, lhs, rhs, targetReg))
-            break;
-
-        as->addDouble(as->toDoubleRegister(lhs, JITAssembler::FPGpr0), as->toDoubleRegister(rhs, JITAssembler::FPGpr1), targetReg);
-        break;
-
-    case IR::OpMul:
-        if (lhs->asConst())
-            std::swap(lhs, rhs); // Y = constant * X -> Y = X * constant
-
-        if (ArchitectureSpecificBinaryOperation<JITAssembler>::doubleMul(as, lhs, rhs, targetReg))
-            break;
-
-        as->mulDouble(as->toDoubleRegister(lhs, JITAssembler::FPGpr0), as->toDoubleRegister(rhs, JITAssembler::FPGpr1), targetReg);
-        break;
-
-    case IR::OpSub:
-        if (ArchitectureSpecificBinaryOperation<JITAssembler>::doubleSub(as, lhs, rhs, targetReg))
-            break;
-
-        if (rhs->asTemp() && rhs->asTemp()->kind == IR::Temp::PhysicalRegister
-                && targetTemp
-                && targetTemp->kind == IR::Temp::PhysicalRegister
-                && targetTemp->index == rhs->asTemp()->index) { // Y = X - Y -> Tmp = Y; Y = X - Tmp
-            as->moveDouble(as->toDoubleRegister(rhs, JITAssembler::FPGpr1), JITAssembler::FPGpr1);
-            as->subDouble(as->toDoubleRegister(lhs, JITAssembler::FPGpr0), JITAssembler::FPGpr1, targetReg);
-            break;
-        }
-
-        as->subDouble(as->toDoubleRegister(lhs, JITAssembler::FPGpr0), as->toDoubleRegister(rhs, JITAssembler::FPGpr1), targetReg);
-        break;
-
-    case IR::OpDiv:
-        if (ArchitectureSpecificBinaryOperation<JITAssembler>::doubleDiv(as, lhs, rhs, targetReg))
-            break;
-
-        if (rhs->asTemp() && rhs->asTemp()->kind == IR::Temp::PhysicalRegister
-                && targetTemp
-                && targetTemp->kind == IR::Temp::PhysicalRegister
-                && targetTemp->index == rhs->asTemp()->index) { // Y = X / Y -> Tmp = Y; Y = X / Tmp
-            as->moveDouble(as->toDoubleRegister(rhs, JITAssembler::FPGpr1), JITAssembler::FPGpr1);
-            as->divDouble(as->toDoubleRegister(lhs, JITAssembler::FPGpr0), JITAssembler::FPGpr1, targetReg);
-            break;
-        }
-
-        as->divDouble(as->toDoubleRegister(lhs, JITAssembler::FPGpr0), as->toDoubleRegister(rhs, JITAssembler::FPGpr1), targetReg);
-        break;
-
-    default: {
-        Jump trueCase = as->branchDouble(false, op, lhs, rhs);
-        as->storeBool(false, target);
-        Jump done = as->jump();
-        trueCase.link(as);
-        as->storeBool(true, target);
-        done.link(as);
-    } return;
-    }
-
-    if (!targetTemp || targetTemp->kind != IR::Temp::PhysicalRegister)
-        as->storeDouble(targetReg, target);
-}
-
-template <typename JITAssembler>
-bool Binop<JITAssembler>::int32Binop(IR::Expr *leftSource, IR::Expr *rightSource, IR::Expr *target)
-{
-    Q_ASSERT(leftSource->type == IR::SInt32Type);
-    Q_ASSERT(rightSource->type == IR::SInt32Type);
-
-    switch (op) {
-    case IR::OpBitAnd:
-    case IR::OpBitOr:
-    case IR::OpBitXor:
-    case IR::OpAdd:
-    case IR::OpMul:
-        if (leftSource->asConst()) // X = Const op Y -> X = Y op Const
-            std::swap(leftSource, rightSource);
-        else if (IR::Temp *t = leftSource->asTemp()) {
-            if (t->kind != IR::Temp::PhysicalRegister) // X = [address] op Y -> X = Y op [address]
-                std::swap(leftSource, rightSource);
-        }
-        break;
-
-    case IR::OpLShift:
-    case IR::OpRShift:
-    case IR::OpURShift:
-    case IR::OpSub:
-        // handled by this method, but we can't flip operands.
-        break;
-
-    default:
-        return false; // not handled by this method, stop here.
-    }
-
-    bool inplaceOpWithAddress = false;
-
-    IR::Temp *targetTemp = target->asTemp();
-    RegisterID targetReg = JITAssembler::ReturnValueRegister;
-    if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister) {
-        IR::Temp *rhs = rightSource->asTemp();
-        if (!rhs || rhs->kind != IR::Temp::PhysicalRegister || rhs->index != targetTemp->index) {
-            // We try to load leftSource into the target's register, but we can't do that if
-            // the target register is the same as rightSource.
-            targetReg = (RegisterID) targetTemp->index;
-        } else if (rhs && rhs->kind == IR::Temp::PhysicalRegister && targetTemp->index == rhs->index) {
-            // However, if the target register is the same as the rightSource register, we can flip
-            // the operands for certain operations.
-            switch (op) {
-            case IR::OpBitAnd:
-            case IR::OpBitOr:
-            case IR::OpBitXor:
-            case IR::OpAdd:
-            case IR::OpMul:
-                // X = Y op X -> X = X op Y (or rephrased: X op= Y (so an in-place operation))
-                std::swap(leftSource, rightSource);
-                targetReg = (RegisterID) targetTemp->index;
-                break;
-
-            case IR::OpLShift:
-            case IR::OpRShift:
-            case IR::OpURShift:
-            case IR::OpSub:
-                break;
-
-            default:
-                Q_UNREACHABLE();
-                return false;
-            }
-        }
-
-        // determine if we have X op= [address]
-        if (IR::Temp *lhs = leftSource->asTemp()) {
-            if (lhs->kind == IR::Temp::PhysicalRegister && lhs->index == targetTemp->index) {
-                if (IR::Temp *rhs = rightSource->asTemp()) {
-                    if (rhs->kind != IR::Temp::PhysicalRegister) {
-                        switch (op) {
-                        case IR::OpBitAnd:
-                        case IR::OpBitOr:
-                        case IR::OpBitXor:
-                        case IR::OpAdd:
-                        case IR::OpMul:
-                            inplaceOpWithAddress = true;
-                            break;
-                        default:
-                            break;
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-    // Special cases:
-    switch (op) {
-    case IR::OpSub:
-        if (rightSource->asTemp() && rightSource->asTemp()->kind == IR::Temp::PhysicalRegister
-                && targetTemp
-                && targetTemp->kind == IR::Temp::PhysicalRegister
-                && targetTemp->index == rightSource->asTemp()->index) {
-            // X = Y - X -> Tmp = X; X = Y; X -= Tmp
-            targetReg = (RegisterID) targetTemp->index;
-            as->move(targetReg, JITAssembler::ScratchRegister);
-            as->move(as->toInt32Register(leftSource, targetReg), targetReg);
-            as->sub32(JITAssembler::ScratchRegister, targetReg);
-        } else {
-            as->move(as->toInt32Register(leftSource, targetReg), targetReg);
-            as->sub32(as->toInt32Register(rightSource, JITAssembler::ScratchRegister), targetReg);
-        }
-        as->storeInt32(targetReg, target);
-        return true;
-
-    case IR::OpLShift:
-    case IR::OpRShift:
-    case IR::OpURShift:
-        if (IR::Const *c = rightSource->asConst()) {
-            if ((QV4::Primitive::toUInt32(c->value) & 0x1f) == 0) {
-                RegisterID r = as->toInt32Register(leftSource, targetReg);
-                as->storeInt32(r, target);
-                return true;
-            }
-        }
-        break;
-
-    default:
-        break;
-    }
-
-    RegisterID l = as->toInt32Register(leftSource, targetReg);
-    if (IR::Const *c = rightSource->asConst()) { // All cases of Y = X op Const
-        TrustedImm32 r(int(c->value));
-        TrustedImm32 ur(QV4::Primitive::toUInt32(c->value) & 0x1f);
-
-        switch (op) {
-        case IR::OpBitAnd: as->and32(r, l, targetReg); break;
-        case IR::OpBitOr:  as->or32 (r, l, targetReg); break;
-        case IR::OpBitXor: as->xor32(r, l, targetReg); break;
-        case IR::OpAdd:    as->add32(r, l, targetReg); break;
-        case IR::OpMul:    as->mul32(r, l, targetReg); break;
-
-        case IR::OpLShift:  as->lshift32(l, ur, targetReg); break;
-        case IR::OpRShift:  as->rshift32(l, ur, targetReg); break;
-        case IR::OpURShift: as->urshift32(l, ur, targetReg);
-            as->storeUInt32(targetReg, target); // IMPORTANT: do NOT do a break here! The stored type of an urshift is different from the other binary operations!
-            return true;
-
-        case IR::OpSub: // already handled before
-        default: // not handled by this method:
-            Q_UNREACHABLE();
-            return false;
-        }
-    } else if (inplaceOpWithAddress) { // All cases of X = X op [address-of-Y]
-        Pointer rhsAddr = as->loadAddressForReading(JITAssembler::ScratchRegister, rightSource);
-        switch (op) {
-        case IR::OpBitAnd: as->and32(rhsAddr, targetReg); break;
-        case IR::OpBitOr:  as->or32 (rhsAddr, targetReg); break;
-        case IR::OpBitXor: as->xor32(rhsAddr, targetReg); break;
-        case IR::OpAdd:    as->add32(rhsAddr, targetReg); break;
-        case IR::OpMul:    as->mul32(rhsAddr, targetReg); break;
-            break;
-
-        default: // not handled by this method:
-            Q_UNREACHABLE();
-            return false;
-        }
-    } else { // All cases of Z = X op Y
-        RegisterID r = as->toInt32Register(rightSource, JITAssembler::ScratchRegister);
-        switch (op) {
-        case IR::OpBitAnd: as->and32(l, r, targetReg); break;
-        case IR::OpBitOr:  as->or32 (l, r, targetReg); break;
-        case IR::OpBitXor: as->xor32(l, r, targetReg); break;
-        case IR::OpAdd:    as->add32(l, r, targetReg); break;
-        case IR::OpMul:    as->mul32(l, r, targetReg); break;
-
-#if CPU(X86) || CPU(X86_64)
-        // Intel does the & 0x1f on the CPU, so:
-        case IR::OpLShift:  as->lshift32(l, r, targetReg); break;
-        case IR::OpRShift:  as->rshift32(l, r, targetReg); break;
-        case IR::OpURShift: as->urshift32(l, r, targetReg);
-            as->storeUInt32(targetReg, target); // IMPORTANT: do NOT do a break here! The stored type of an urshift is different from the other binary operations!
-            return true;
-#else
-        // Not all CPUs accept shifts over more than 31 bits, and some CPUs (like ARM) will do
-        // surprising stuff when shifting over 0 bits.
-#define CHECK_RHS(op) { \
-    as->and32(TrustedImm32(0x1f), r, JITAssembler::ScratchRegister); \
-    Jump notZero = as->branch32(RelationalCondition::NotEqual, JITAssembler::ScratchRegister, TrustedImm32(0)); \
-    as->move(l, targetReg); \
-    Jump done = as->jump(); \
-    notZero.link(as); \
-    op; \
-    done.link(as); \
-}
-        case IR::OpLShift: CHECK_RHS(as->lshift32(l, JITAssembler::ScratchRegister, targetReg)); break;
-        case IR::OpRShift: CHECK_RHS(as->rshift32(l, JITAssembler::ScratchRegister, targetReg)); break;
-        case IR::OpURShift:
-            CHECK_RHS(as->urshift32(l, JITAssembler::ScratchRegister, targetReg));
-            as->storeUInt32(targetReg, target);
-            // IMPORTANT: do NOT do a break here! The stored type of an urshift is different from the other binary operations!
-            return true;
-#undef CHECK_RHS
-#endif
-
-        case IR::OpSub: // already handled before
-        default: // not handled by this method:
-            Q_UNREACHABLE();
-            return false;
-        }
-    }
-
-    as->storeInt32(targetReg, target);
-    return true;
-}
-
-template <typename JITAssembler>
-inline typename JITAssembler::FPRegisterID getFreeFPReg(IR::Expr *shouldNotOverlap, unsigned hint)
-{
-    if (IR::Temp *t = shouldNotOverlap->asTemp())
-        if (t->type == IR::DoubleType)
-            if (t->kind == IR::Temp::PhysicalRegister)
-                if (t->index == hint)
-                    return typename JITAssembler::FPRegisterID(hint + 1);
-    return typename JITAssembler::FPRegisterID(hint);
-}
-
-template <typename JITAssembler>
-typename JITAssembler::Jump Binop<JITAssembler>::genInlineBinop(IR::Expr *leftSource, IR::Expr *rightSource, IR::Expr *target)
-{
-    Jump done;
-
-    // Try preventing a call for a few common binary operations. This is used in two cases:
-    // - no register allocation was performed (not available for the platform, or the IR was
-    //   not transformed into SSA)
-    // - type inference found that either or both operands can be of non-number type, and the
-    //   register allocator will have prepared for a call (meaning: all registers that do not
-    //   hold operands are spilled to the stack, which makes them available here)
-    // Note: FPGPr0 can still not be used, because uint32->double conversion uses it as a scratch
-    //       register.
-    switch (op) {
-    case IR::OpAdd: {
-        FPRegisterID lReg = getFreeFPReg<JITAssembler>(rightSource, 2);
-        FPRegisterID rReg = getFreeFPReg<JITAssembler>(leftSource, 4);
-        Jump leftIsNoDbl = as->genTryDoubleConversion(leftSource, lReg);
-        Jump rightIsNoDbl = as->genTryDoubleConversion(rightSource, rReg);
-
-        as->addDouble(rReg, lReg);
-        as->storeDouble(lReg, target);
-        done = as->jump();
-
-        if (leftIsNoDbl.isSet())
-            leftIsNoDbl.link(as);
-        if (rightIsNoDbl.isSet())
-            rightIsNoDbl.link(as);
-    } break;
-    case IR::OpMul: {
-        FPRegisterID lReg = getFreeFPReg<JITAssembler>(rightSource, 2);
-        FPRegisterID rReg = getFreeFPReg<JITAssembler>(leftSource, 4);
-        Jump leftIsNoDbl = as->genTryDoubleConversion(leftSource, lReg);
-        Jump rightIsNoDbl = as->genTryDoubleConversion(rightSource, rReg);
-
-        as->mulDouble(rReg, lReg);
-        as->storeDouble(lReg, target);
-        done = as->jump();
-
-        if (leftIsNoDbl.isSet())
-            leftIsNoDbl.link(as);
-        if (rightIsNoDbl.isSet())
-            rightIsNoDbl.link(as);
-    } break;
-    case IR::OpSub: {
-        FPRegisterID lReg = getFreeFPReg<JITAssembler>(rightSource, 2);
-        FPRegisterID rReg = getFreeFPReg<JITAssembler>(leftSource, 4);
-        Jump leftIsNoDbl = as->genTryDoubleConversion(leftSource, lReg);
-        Jump rightIsNoDbl = as->genTryDoubleConversion(rightSource, rReg);
-
-        as->subDouble(rReg, lReg);
-        as->storeDouble(lReg, target);
-        done = as->jump();
-
-        if (leftIsNoDbl.isSet())
-            leftIsNoDbl.link(as);
-        if (rightIsNoDbl.isSet())
-            rightIsNoDbl.link(as);
-    } break;
-    case IR::OpDiv: {
-        FPRegisterID lReg = getFreeFPReg<JITAssembler>(rightSource, 2);
-        FPRegisterID rReg = getFreeFPReg<JITAssembler>(leftSource, 4);
-        Jump leftIsNoDbl = as->genTryDoubleConversion(leftSource, lReg);
-        Jump rightIsNoDbl = as->genTryDoubleConversion(rightSource, rReg);
-
-        as->divDouble(rReg, lReg);
-        as->storeDouble(lReg, target);
-        done = as->jump();
-
-        if (leftIsNoDbl.isSet())
-            leftIsNoDbl.link(as);
-        if (rightIsNoDbl.isSet())
-            rightIsNoDbl.link(as);
-    } break;
-    default:
-        break;
-    }
-
-    return done;
-}
-
-template struct QV4::JIT::Binop<QV4::JIT::Assembler<DefaultAssemblerTargetConfiguration>>;
-#if defined(V4_BOOTSTRAP)
-#if !CPU(ARM_THUMB2)
-template struct QV4::JIT::Binop<QV4::JIT::Assembler<AssemblerTargetConfiguration<JSC::MacroAssemblerARMv7, NoOperatingSystemSpecialization>>>;
-#endif
-#if !CPU(ARM64)
-template struct QV4::JIT::Binop<QV4::JIT::Assembler<AssemblerTargetConfiguration<JSC::MacroAssemblerARM64, NoOperatingSystemSpecialization>>>;
-#endif
-#endif
-
-} // end of namespace JIT
-} // end of namespace QV4
-
-QT_END_NAMESPACE
-
-
-#endif
diff --git a/src/qml/jit/qv4binop_p.h b/src/qml/jit/qv4binop_p.h
deleted file mode 100644
index 1b1ab7f24d..0000000000
--- a/src/qml/jit/qv4binop_p.h
+++ /dev/null
@@ -1,256 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-#ifndef QV4BINOP_P_H
-#define QV4BINOP_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include <qv4jsir_p.h>
-#include <qv4isel_masm_p.h>
-#include <qv4assembler_p.h>
-
-QT_BEGIN_NAMESPACE
-
-#if ENABLE(ASSEMBLER)
-
-namespace QV4 {
-namespace JIT {
-
-template <typename JITAssembler>
-struct Binop {
-    Binop(JITAssembler *assembler, IR::AluOp operation)
-        : as(assembler)
-        , op(operation)
-    {}
-
-    using Jump = typename JITAssembler::Jump;
-    using Address = typename JITAssembler::Address;
-    using RegisterID = typename JITAssembler::RegisterID;
-    using FPRegisterID = typename JITAssembler::FPRegisterID;
-    using TrustedImm32 = typename JITAssembler::TrustedImm32;
-    using ResultCondition = typename JITAssembler::ResultCondition;
-    using RelationalCondition = typename JITAssembler::RelationalCondition;
-    using Pointer = typename JITAssembler::Pointer;
-    using PointerToValue = typename JITAssembler::PointerToValue;
-
-    void generate(IR::Expr *lhs, IR::Expr *rhs, IR::Expr *target);
-    void doubleBinop(IR::Expr *lhs, IR::Expr *rhs, IR::Expr *target);
-    bool int32Binop(IR::Expr *leftSource, IR::Expr *rightSource, IR::Expr *target);
-    Jump genInlineBinop(IR::Expr *leftSource, IR::Expr *rightSource, IR::Expr *target);
-
-    typedef Jump (Binop::*MemRegOp)(Address, RegisterID);
-    typedef Jump (Binop::*ImmRegOp)(TrustedImm32, RegisterID);
-
-    struct OpInfo {
-        const char *name;
-        Runtime::RuntimeMethods fallbackImplementation;
-        Runtime::RuntimeMethods contextImplementation;
-        MemRegOp inlineMemRegOp;
-        ImmRegOp inlineImmRegOp;
-        bool needsExceptionCheck;
-    };
-
-    static const OpInfo operations[IR::LastAluOp + 1];
-    static const OpInfo &operation(IR::AluOp operation)
-    { return operations[operation]; }
-
-    Jump inline_add32(Address addr, RegisterID reg)
-    {
-#if HAVE(ALU_OPS_WITH_MEM_OPERAND)
-        return as->branchAdd32(ResultCondition::Overflow, addr, reg);
-#else
-        as->load32(addr, JITAssembler::ScratchRegister);
-        return as->branchAdd32(ResultCondition::Overflow, JITAssembler::ScratchRegister, reg);
-#endif
-    }
-
-    Jump inline_add32(TrustedImm32 imm, RegisterID reg)
-    {
-        return as->branchAdd32(ResultCondition::Overflow, imm, reg);
-    }
-
-    Jump inline_sub32(Address addr, RegisterID reg)
-    {
-#if HAVE(ALU_OPS_WITH_MEM_OPERAND)
-        return as->branchSub32(ResultCondition::Overflow, addr, reg);
-#else
-        as->load32(addr, JITAssembler::ScratchRegister);
-        return as->branchSub32(ResultCondition::Overflow, JITAssembler::ScratchRegister, reg);
-#endif
-    }
-
-    Jump inline_sub32(TrustedImm32 imm, RegisterID reg)
-    {
-        return as->branchSub32(ResultCondition::Overflow, imm, reg);
-    }
-
-    Jump inline_mul32(Address addr, RegisterID reg)
-    {
-#if HAVE(ALU_OPS_WITH_MEM_OPERAND)
-        return as->branchMul32(JITAssembler::Overflow, addr, reg);
-#else
-        as->load32(addr, JITAssembler::ScratchRegister);
-        return as->branchMul32(ResultCondition::Overflow, JITAssembler::ScratchRegister, reg);
-#endif
-    }
-
-    Jump inline_mul32(TrustedImm32 imm, RegisterID reg)
-    {
-        return as->branchMul32(ResultCondition::Overflow, imm, reg, reg);
-    }
-
-    Jump inline_shl32(Address addr, RegisterID reg)
-    {
-        as->load32(addr, JITAssembler::ScratchRegister);
-        as->and32(TrustedImm32(0x1f), JITAssembler::ScratchRegister);
-        as->lshift32(JITAssembler::ScratchRegister, reg);
-        return Jump();
-    }
-
-    Jump inline_shl32(TrustedImm32 imm, RegisterID reg)
-    {
-        imm.m_value &= 0x1f;
-        as->lshift32(imm, reg);
-        return Jump();
-    }
-
-    Jump inline_shr32(Address addr, RegisterID reg)
-    {
-        as->load32(addr, JITAssembler::ScratchRegister);
-        as->and32(TrustedImm32(0x1f), JITAssembler::ScratchRegister);
-        as->rshift32(JITAssembler::ScratchRegister, reg);
-        return Jump();
-    }
-
-    Jump inline_shr32(TrustedImm32 imm, RegisterID reg)
-    {
-        imm.m_value &= 0x1f;
-        as->rshift32(imm, reg);
-        return Jump();
-    }
-
-    Jump inline_ushr32(Address addr, RegisterID reg)
-    {
-        as->load32(addr, JITAssembler::ScratchRegister);
-        as->and32(TrustedImm32(0x1f), JITAssembler::ScratchRegister);
-        as->urshift32(JITAssembler::ScratchRegister, reg);
-        return as->branchTest32(ResultCondition::Signed, reg, reg);
-    }
-
-    Jump inline_ushr32(TrustedImm32 imm, RegisterID reg)
-    {
-        imm.m_value &= 0x1f;
-        as->urshift32(imm, reg);
-        return as->branchTest32(ResultCondition::Signed, reg, reg);
-    }
-
-    Jump inline_and32(Address addr, RegisterID reg)
-    {
-#if HAVE(ALU_OPS_WITH_MEM_OPERAND)
-        as->and32(addr, reg);
-#else
-        as->load32(addr, JITAssembler::ScratchRegister);
-        as->and32(JITAssembler::ScratchRegister, reg);
-#endif
-        return Jump();
-    }
-
-    Jump inline_and32(TrustedImm32 imm, RegisterID reg)
-    {
-        as->and32(imm, reg);
-        return Jump();
-    }
-
-    Jump inline_or32(Address addr, RegisterID reg)
-    {
-#if HAVE(ALU_OPS_WITH_MEM_OPERAND)
-        as->or32(addr, reg);
-#else
-        as->load32(addr, JITAssembler::ScratchRegister);
-        as->or32(JITAssembler::ScratchRegister, reg);
-#endif
-        return Jump();
-    }
-
-    Jump inline_or32(TrustedImm32 imm, RegisterID reg)
-    {
-        as->or32(imm, reg);
-        return Jump();
-    }
-
-    Jump inline_xor32(Address addr, RegisterID reg)
-    {
-#if HAVE(ALU_OPS_WITH_MEM_OPERAND)
-        as->xor32(addr, reg);
-#else
-        as->load32(addr, JITAssembler::ScratchRegister);
-        as->xor32(JITAssembler::ScratchRegister, reg);
-#endif
-        return Jump();
-    }
-
-    Jump inline_xor32(TrustedImm32 imm, RegisterID reg)
-    {
-        as->xor32(imm, reg);
-        return Jump();
-    }
-
-
-
-    JITAssembler *as;
-    IR::AluOp op;
-};
-
-}
-}
-
-#endif
-
-QT_END_NAMESPACE
-
-#endif
diff --git a/src/qml/jit/qv4isel_masm.cpp b/src/qml/jit/qv4isel_masm.cpp
deleted file mode 100644
index 7784eb364e..0000000000
--- a/src/qml/jit/qv4isel_masm.cpp
+++ /dev/null
@@ -1,1684 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qv4isel_masm_p.h"
-#include "qv4runtime_p.h"
-#include "qv4lookup_p.h"
-#include "qv4ssa_p.h"
-#include "qv4regalloc_p.h"
-#include "qv4assembler_p.h"
-#include "qv4unop_p.h"
-#include "qv4binop_p.h"
-
-#include <QtCore/QBuffer>
-#include <QtCore/QCoreApplication>
-
-#include <assembler/LinkBuffer.h>
-#include <WTFStubs.h>
-
-#include <iostream>
-
-#if ENABLE(ASSEMBLER)
-
-#if USE(UDIS86)
-#  include <udis86.h>
-#endif
-
-using namespace QV4;
-using namespace QV4::JIT;
-
-
-template <typename JITAssembler>
-InstructionSelection<JITAssembler>::InstructionSelection(QQmlEnginePrivate *qmlEngine, QV4::ExecutableAllocator *execAllocator, IR::Module *module, Compiler::JSUnitGenerator *jsGenerator, EvalISelFactory *iselFactory)
-    : EvalInstructionSelection(execAllocator, module, jsGenerator, iselFactory)
-    , _block(0)
-    , _as(0)
-    , compilationUnit(new CompilationUnit)
-    , qmlEngine(qmlEngine)
-{
-    compilationUnit->codeRefs.resize(module->functions.size());
-    module->unitFlags |= QV4::CompiledData::Unit::ContainsMachineCode;
-}
-
-template <typename JITAssembler>
-InstructionSelection<JITAssembler>::~InstructionSelection()
-{
-    delete _as;
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::run(int functionIndex)
-{
-    IR::Function *function = irModule->functions[functionIndex];
-    qSwap(_function, function);
-
-    IR::Optimizer opt(_function);
-    opt.run(qmlEngine);
-
-    static const bool withRegisterAllocator = qEnvironmentVariableIsEmpty("QV4_NO_REGALLOC");
-    if (JITTargetPlatform::RegAllocIsSupported && opt.isInSSA() && withRegisterAllocator) {
-        RegisterAllocator regalloc(JITTargetPlatform::getRegisterInfo());
-        regalloc.run(_function, opt);
-        calculateRegistersToSave(regalloc.usedRegisters());
-    } else {
-        if (opt.isInSSA())
-            // No register allocator available for this platform, or env. var was set, so:
-            opt.convertOutOfSSA();
-        ConvertTemps().toStackSlots(_function);
-        IR::Optimizer::showMeTheCode(_function, "After stack slot allocation");
-        calculateRegistersToSave(JITTargetPlatform::getRegisterInfo()); // FIXME: this saves all registers. We can probably do with a subset: those that are not used by the register allocator.
-    }
-    BitVector removableJumps = opt.calculateOptionalJumps();
-    qSwap(_removableJumps, removableJumps);
-
-    JITAssembler* oldAssembler = _as;
-    _as = new JITAssembler(jsGenerator, _function, executableAllocator);
-    _as->setStackLayout(6, // 6 == max argc for calls to built-ins with an argument array
-                        regularRegistersToSave.size(),
-                        fpRegistersToSave.size());
-    _as->enterStandardStackFrame(regularRegistersToSave, fpRegistersToSave);
-
-    if (JITTargetPlatform::RegisterArgumentCount > 0)
-        _as->move(_as->registerForArgument(0), JITTargetPlatform::EngineRegister);
-    else
-        _as->loadPtr(addressForArgument(0), JITTargetPlatform::EngineRegister);
-
-    _as->initializeLocalVariables();
-
-    int lastLine = 0;
-    for (int i = 0, ei = _function->basicBlockCount(); i != ei; ++i) {
-        IR::BasicBlock *nextBlock = (i < ei - 1) ? _function->basicBlock(i + 1) : 0;
-        _block = _function->basicBlock(i);
-        if (_block->isRemoved())
-            continue;
-        _as->registerBlock(_block, nextBlock);
-
-        for (IR::Stmt *s : _block->statements()) {
-            if (s->location.isValid()) {
-                if (int(s->location.startLine) != lastLine) {
-                    _as->loadPtr(Address(JITTargetPlatform::EngineRegister, JITAssembler::targetStructureOffset(offsetof(QV4::EngineBase, current))), JITTargetPlatform::ScratchRegister);
-                    Address lineAddr(JITTargetPlatform::ScratchRegister, JITAssembler::targetStructureOffset(Heap::ExecutionContextData::baseOffset + offsetof(Heap::ExecutionContextData, lineNumber)));
-                    _as->store32(TrustedImm32(s->location.startLine), lineAddr);
-                    lastLine = s->location.startLine;
-                }
-            }
-            visit(s);
-        }
-    }
-
-    if (!_as->exceptionReturnLabel.isSet())
-        visitRet(0);
-
-    int dummySize;
-    JSC::MacroAssemblerCodeRef codeRef =_as->link(&dummySize);
-    compilationUnit->codeRefs[functionIndex] = codeRef;
-
-    qSwap(_function, function);
-    delete _as;
-    _as = oldAssembler;
-    qSwap(_removableJumps, removableJumps);
-}
-
-template <typename JITAssembler>
-QQmlRefPointer<QV4::CompiledData::CompilationUnit> InstructionSelection<JITAssembler>::backendCompileStep()
-{
-    QQmlRefPointer<QV4::CompiledData::CompilationUnit> result;
-    result.adopt(compilationUnit.take());
-    return result;
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinInvalid(IR::Name *func, IR::ExprList *args, IR::Expr *result)
-{
-    prepareCallData(args, 0);
-
-    if (useFastLookups && func->global) {
-        uint index = registerGlobalGetterLookup(*func->id);
-        generateRuntimeCall(_as, result, callGlobalLookup,
-                             JITTargetPlatform::EngineRegister,
-                             TrustedImm32(index),
-                             baseAddressForCallData());
-    } else {
-        generateRuntimeCall(_as, result, callActivationProperty,
-                             JITTargetPlatform::EngineRegister,
-                             StringToIndex(*func->id),
-                             baseAddressForCallData());
-    }
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinTypeofQmlContextProperty(IR::Expr *base,
-                                                               IR::Member::MemberKind kind,
-                                                               int propertyIndex, IR::Expr *result)
-{
-    if (kind == IR::Member::MemberOfQmlScopeObject) {
-        generateRuntimeCall(_as, result, typeofScopeObjectProperty, JITTargetPlatform::EngineRegister,
-                             PointerToValue(base),
-                             TrustedImm32(propertyIndex));
-    } else if (kind == IR::Member::MemberOfQmlContextObject) {
-        generateRuntimeCall(_as, result, typeofContextObjectProperty,
-                             JITTargetPlatform::EngineRegister, PointerToValue(base),
-                             TrustedImm32(propertyIndex));
-    } else {
-        Q_UNREACHABLE();
-    }
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinTypeofMember(IR::Expr *base, const QString &name,
-                                                   IR::Expr *result)
-{
-    generateRuntimeCall(_as, result, typeofMember, JITTargetPlatform::EngineRegister,
-                         PointerToValue(base), StringToIndex(name));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinTypeofSubscript(IR::Expr *base, IR::Expr *index,
-                                                      IR::Expr *result)
-{
-    generateRuntimeCall(_as, result, typeofElement,
-                         JITTargetPlatform::EngineRegister,
-                         PointerToValue(base), PointerToValue(index));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinTypeofName(const QString &name, IR::Expr *result)
-{
-    generateRuntimeCall(_as, result, typeofName, JITTargetPlatform::EngineRegister,
-                         StringToIndex(name));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinTypeofValue(IR::Expr *value, IR::Expr *result)
-{
-    generateRuntimeCall(_as, result, typeofValue, JITTargetPlatform::EngineRegister,
-                         PointerToValue(value));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinDeleteMember(IR::Expr *base, const QString &name, IR::Expr *result)
-{
-    generateRuntimeCall(_as, result, deleteMember, JITTargetPlatform::EngineRegister,
-                         Reference(base), StringToIndex(name));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinDeleteSubscript(IR::Expr *base, IR::Expr *index,
-                                                      IR::Expr *result)
-{
-    generateRuntimeCall(_as, result, deleteElement, JITTargetPlatform::EngineRegister,
-                         Reference(base), PointerToValue(index));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinDeleteName(const QString &name, IR::Expr *result)
-{
-    generateRuntimeCall(_as, result, deleteName, JITTargetPlatform::EngineRegister,
-                         StringToIndex(name));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinDeleteValue(IR::Expr *result)
-{
-    _as->storeValue(JITAssembler::TargetPrimitive::fromBoolean(false), result);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinThrow(IR::Expr *arg)
-{
-    generateRuntimeCall(_as, JITTargetPlatform::ReturnValueRegister, throwException, JITTargetPlatform::EngineRegister,
-                         PointerToValue(arg));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinReThrow()
-{
-    _as->jumpToExceptionHandler();
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinUnwindException(IR::Expr *result)
-{
-    generateRuntimeCall(_as, result, unwindException, JITTargetPlatform::EngineRegister);
-
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinPushCatchScope(const QString &exceptionName)
-{
-    generateRuntimeCall(_as, JITAssembler::Void, pushCatchScope, JITTargetPlatform::EngineRegister, StringToIndex(exceptionName));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinForeachIteratorObject(IR::Expr *arg, IR::Expr *result)
-{
-    Q_ASSERT(arg);
-    Q_ASSERT(result);
-
-    generateRuntimeCall(_as, result, foreachIterator, JITTargetPlatform::EngineRegister, PointerToValue(arg));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinForeachNextPropertyname(IR::Expr *arg, IR::Expr *result)
-{
-    Q_ASSERT(arg);
-    Q_ASSERT(result);
-
-    generateRuntimeCall(_as, result, foreachNextPropertyName, Reference(arg));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinPushWithScope(IR::Expr *arg)
-{
-    Q_ASSERT(arg);
-
-    generateRuntimeCall(_as, JITAssembler::Void, pushWithScope, Reference(arg), JITTargetPlatform::EngineRegister);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinPopScope()
-{
-    generateRuntimeCall(_as, JITAssembler::Void, popScope, JITTargetPlatform::EngineRegister);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinDeclareVar(bool deletable, const QString &name)
-{
-    generateRuntimeCall(_as, JITAssembler::Void, declareVar, JITTargetPlatform::EngineRegister,
-                         TrustedImm32(deletable), StringToIndex(name));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinDefineArray(IR::Expr *result, IR::ExprList *args)
-{
-    Q_ASSERT(result);
-
-    int length = prepareVariableArguments(args);
-    generateRuntimeCall(_as, result, arrayLiteral, JITTargetPlatform::EngineRegister,
-                         baseAddressForCallArguments(), TrustedImm32(length));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinDefineObjectLiteral(IR::Expr *result, int keyValuePairCount, IR::ExprList *keyValuePairs, IR::ExprList *arrayEntries, bool needSparseArray)
-{
-    Q_ASSERT(result);
-
-    int argc = 0;
-
-    const int classId = registerJSClass(keyValuePairCount, keyValuePairs);
-
-    IR::ExprList *it = keyValuePairs;
-    for (int i = 0; i < keyValuePairCount; ++i, it = it->next) {
-        it = it->next;
-
-        bool isData = it->expr->asConst()->value;
-        it = it->next;
-
-        _as->copyValue(_as->stackLayout().argumentAddressForCall(argc++), it->expr, WriteBarrier::NoBarrier);
-
-        if (!isData) {
-            it = it->next;
-            _as->copyValue(_as->stackLayout().argumentAddressForCall(argc++), it->expr, WriteBarrier::NoBarrier);
-        }
-    }
-
-    it = arrayEntries;
-    uint arrayValueCount = 0;
-    while (it) {
-        uint index = it->expr->asConst()->value;
-        it = it->next;
-
-        bool isData = it->expr->asConst()->value;
-        it = it->next;
-
-        if (!isData) {
-            it = it->next; // getter
-            it = it->next; // setter
-            continue;
-        }
-
-        ++arrayValueCount;
-
-        // Index
-        _as->storeValue(JITAssembler::TargetPrimitive::fromUInt32(index), _as->stackLayout().argumentAddressForCall(argc++), WriteBarrier::NoBarrier);
-
-        // Value
-        _as->copyValue(_as->stackLayout().argumentAddressForCall(argc++), it->expr, WriteBarrier::NoBarrier);
-        it = it->next;
-    }
-
-    it = arrayEntries;
-    uint arrayGetterSetterCount = 0;
-    while (it) {
-        uint index = it->expr->asConst()->value;
-        it = it->next;
-
-        bool isData = it->expr->asConst()->value;
-        it = it->next;
-
-        if (isData) {
-            it = it->next; // value
-            continue;
-        }
-
-        ++arrayGetterSetterCount;
-
-        // Index
-        _as->storeValue(JITAssembler::TargetPrimitive::fromUInt32(index), _as->stackLayout().argumentAddressForCall(argc++), WriteBarrier::NoBarrier);
-
-        // Getter
-        _as->copyValue(_as->stackLayout().argumentAddressForCall(argc++), it->expr, WriteBarrier::NoBarrier);
-        it = it->next;
-
-        // Setter
-        _as->copyValue(_as->stackLayout().argumentAddressForCall(argc++), it->expr, WriteBarrier::NoBarrier);
-        it = it->next;
-    }
-
-    generateRuntimeCall(_as, result, objectLiteral, JITTargetPlatform::EngineRegister,
-                         baseAddressForCallArguments(), TrustedImm32(classId),
-                         TrustedImm32(arrayValueCount), TrustedImm32(arrayGetterSetterCount | (needSparseArray << 30)));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinSetupArgumentObject(IR::Expr *result)
-{
-    generateRuntimeCall(_as, result, setupArgumentsObject, JITTargetPlatform::EngineRegister);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callBuiltinConvertThisToObject()
-{
-    generateRuntimeCall(_as, JITAssembler::Void, convertThisToObject, JITTargetPlatform::EngineRegister);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callValue(IR::Expr *value, IR::ExprList *args, IR::Expr *result)
-{
-    Q_ASSERT(value);
-
-    prepareCallData(args, 0);
-    if (value->asConst())
-        generateRuntimeCall(_as, result, callValue, JITTargetPlatform::EngineRegister,
-                             PointerToValue(value),
-                             baseAddressForCallData());
-    else
-        generateRuntimeCall(_as, result, callValue, JITTargetPlatform::EngineRegister,
-                             Reference(value),
-                             baseAddressForCallData());
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::loadThisObject(IR::Expr *temp)
-{
-    WriteBarrier::Type barrier;
-    Pointer addr = _as->loadAddressForWriting(JITTargetPlatform::ScratchRegister, temp, &barrier);
-    _as->loadPtr(Address(JITTargetPlatform::EngineRegister, JITAssembler::targetStructureOffset(offsetof(QV4::EngineBase, current))), JITTargetPlatform::ReturnValueRegister);
-    _as->loadPtr(Address(JITTargetPlatform::ReturnValueRegister,JITAssembler::targetStructureOffset(Heap::ExecutionContextData::baseOffset + offsetof(Heap::ExecutionContextData, callData))), JITTargetPlatform::ReturnValueRegister);
-    _as->copyValue(addr, Address(JITTargetPlatform::ReturnValueRegister, offsetof(CallData, thisObject)), barrier);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::loadQmlContext(IR::Expr *temp)
-{
-    generateRuntimeCall(_as, temp, getQmlContext, JITTargetPlatform::EngineRegister);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::loadQmlImportedScripts(IR::Expr *temp)
-{
-    generateRuntimeCall(_as, temp, getQmlImportedScripts, JITTargetPlatform::EngineRegister);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::loadQmlSingleton(const QString &name, IR::Expr *temp)
-{
-    generateRuntimeCall(_as, temp, getQmlSingleton, JITTargetPlatform::EngineRegister, StringToIndex(name));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::loadConst(IR::Const *sourceConst, IR::Expr *target)
-{
-    if (IR::Temp *targetTemp = target->asTemp()) {
-        if (targetTemp->kind == IR::Temp::PhysicalRegister) {
-            if (targetTemp->type == IR::DoubleType) {
-                Q_ASSERT(sourceConst->type == IR::DoubleType);
-                _as->toDoubleRegister(sourceConst, (FPRegisterID) targetTemp->index);
-            } else if (targetTemp->type == IR::SInt32Type) {
-                Q_ASSERT(sourceConst->type == IR::SInt32Type);
-                _as->toInt32Register(sourceConst, (RegisterID) targetTemp->index);
-            } else if (targetTemp->type == IR::UInt32Type) {
-                Q_ASSERT(sourceConst->type == IR::UInt32Type);
-                _as->toUInt32Register(sourceConst, (RegisterID) targetTemp->index);
-            } else if (targetTemp->type == IR::BoolType) {
-                Q_ASSERT(sourceConst->type == IR::BoolType);
-                _as->move(TrustedImm32(convertToValue<Primitive>(sourceConst).int_32()),
-                          (RegisterID) targetTemp->index);
-            } else {
-                Q_UNREACHABLE();
-            }
-            return;
-        }
-    }
-
-    _as->storeValue(convertToValue<typename JITAssembler::TargetPrimitive>(sourceConst), target);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::loadString(const QString &str, IR::Expr *target)
-{
-    Pointer srcAddr = _as->loadStringAddress(JITTargetPlatform::ReturnValueRegister, str);
-    _as->loadPtr(srcAddr, JITTargetPlatform::ReturnValueRegister);
-    WriteBarrier::Type barrier;
-    Pointer destAddr = _as->loadAddressForWriting(JITTargetPlatform::ScratchRegister, target, &barrier);
-    JITAssembler::RegisterSizeDependentOps::loadManagedPointer(_as, JITTargetPlatform::ReturnValueRegister, destAddr, barrier);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::loadRegexp(IR::RegExp *sourceRegexp, IR::Expr *target)
-{
-    int id = registerRegExp(sourceRegexp);
-    generateRuntimeCall(_as, target, regexpLiteral, JITTargetPlatform::EngineRegister, TrustedImm32(id));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::getActivationProperty(const IR::Name *name, IR::Expr *target)
-{
-    if (useFastLookups && name->global) {
-        uint index = registerGlobalGetterLookup(*name->id);
-        generateLookupCall(target, index, offsetof(QV4::Lookup, globalGetter), JITTargetPlatform::EngineRegister, JITAssembler::Void);
-        return;
-    }
-    generateRuntimeCall(_as, target, getActivationProperty, JITTargetPlatform::EngineRegister, StringToIndex(*name->id));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::setActivationProperty(IR::Expr *source, const QString &targetName)
-{
-    // ### should use a lookup call here
-    generateRuntimeCall(_as, JITAssembler::Void, setActivationProperty,
-                         JITTargetPlatform::EngineRegister, StringToIndex(targetName), PointerToValue(source));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::initClosure(IR::Closure *closure, IR::Expr *target)
-{
-    int id = closure->value;
-    generateRuntimeCall(_as, target, closure, JITTargetPlatform::EngineRegister, TrustedImm32(id));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::getProperty(IR::Expr *base, const QString &name, IR::Expr *target)
-{
-    if (useFastLookups) {
-        uint index = registerGetterLookup(name);
-        generateLookupCall(target, index, offsetof(QV4::Lookup, getter), JITTargetPlatform::EngineRegister, PointerToValue(base), JITAssembler::Void);
-    } else {
-        generateRuntimeCall(_as, target, getProperty, JITTargetPlatform::EngineRegister,
-                             PointerToValue(base), StringToIndex(name));
-    }
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::getQmlContextProperty(IR::Expr *base, IR::Member::MemberKind kind, int index, bool captureRequired, IR::Expr *target)
-{
-    if (kind == IR::Member::MemberOfQmlScopeObject)
-        generateRuntimeCall(_as, target, getQmlScopeObjectProperty, JITTargetPlatform::EngineRegister, PointerToValue(base), TrustedImm32(index), TrustedImm32(captureRequired));
-    else if (kind == IR::Member::MemberOfQmlContextObject)
-        generateRuntimeCall(_as, target, getQmlContextObjectProperty, JITTargetPlatform::EngineRegister, PointerToValue(base), TrustedImm32(index), TrustedImm32(captureRequired));
-    else if (kind == IR::Member::MemberOfIdObjectsArray)
-        generateRuntimeCall(_as, target, getQmlIdObject, JITTargetPlatform::EngineRegister, PointerToValue(base), TrustedImm32(index));
-    else
-        Q_ASSERT(false);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::getQObjectProperty(IR::Expr *base, int propertyIndex, bool captureRequired, bool isSingleton, int attachedPropertiesId, IR::Expr *target)
-{
-    if (attachedPropertiesId != 0)
-        generateRuntimeCall(_as, target, getQmlAttachedProperty, JITTargetPlatform::EngineRegister, TrustedImm32(attachedPropertiesId), TrustedImm32(propertyIndex));
-    else if (isSingleton)
-        generateRuntimeCall(_as, target, getQmlSingletonQObjectProperty, JITTargetPlatform::EngineRegister, PointerToValue(base), TrustedImm32(propertyIndex),
-                             TrustedImm32(captureRequired));
-    else
-        generateRuntimeCall(_as, target, getQmlQObjectProperty, JITTargetPlatform::EngineRegister, PointerToValue(base), TrustedImm32(propertyIndex),
-                             TrustedImm32(captureRequired));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::setProperty(IR::Expr *source, IR::Expr *targetBase,
-                                       const QString &targetName)
-{
-    if (useFastLookups) {
-        uint index = registerSetterLookup(targetName);
-        generateLookupCall(JITAssembler::Void, index, offsetof(QV4::Lookup, setter),
-                           JITTargetPlatform::EngineRegister,
-                           PointerToValue(targetBase),
-                           PointerToValue(source));
-    } else {
-        generateRuntimeCall(_as, JITAssembler::Void, setProperty, JITTargetPlatform::EngineRegister,
-                             PointerToValue(targetBase), StringToIndex(targetName),
-                             PointerToValue(source));
-    }
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::setQmlContextProperty(IR::Expr *source, IR::Expr *targetBase, IR::Member::MemberKind kind, int propertyIndex)
-{
-    if (kind == IR::Member::MemberOfQmlScopeObject)
-        generateRuntimeCall(_as, JITAssembler::Void, setQmlScopeObjectProperty, JITTargetPlatform::EngineRegister, PointerToValue(targetBase),
-                             TrustedImm32(propertyIndex), PointerToValue(source));
-    else if (kind == IR::Member::MemberOfQmlContextObject)
-        generateRuntimeCall(_as, JITAssembler::Void, setQmlContextObjectProperty, JITTargetPlatform::EngineRegister, PointerToValue(targetBase),
-                             TrustedImm32(propertyIndex), PointerToValue(source));
-    else
-        Q_ASSERT(false);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::setQObjectProperty(IR::Expr *source, IR::Expr *targetBase, int propertyIndex)
-{
-    generateRuntimeCall(_as, JITAssembler::Void, setQmlQObjectProperty, JITTargetPlatform::EngineRegister, PointerToValue(targetBase),
-                         TrustedImm32(propertyIndex), PointerToValue(source));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::getElement(IR::Expr *base, IR::Expr *index, IR::Expr *target)
-{
-    if (0 && useFastLookups) {
-        uint lookup = registerIndexedGetterLookup();
-        generateLookupCall(target, lookup, offsetof(QV4::Lookup, indexedGetter),
-                           JITTargetPlatform::EngineRegister,
-                           PointerToValue(base),
-                           PointerToValue(index));
-        return;
-    }
-
-    generateRuntimeCall(_as, target, getElement, JITTargetPlatform::EngineRegister,
-                         PointerToValue(base), PointerToValue(index));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::setElement(IR::Expr *source, IR::Expr *targetBase, IR::Expr *targetIndex)
-{
-    if (0 && useFastLookups) {
-        uint lookup = registerIndexedSetterLookup();
-        generateLookupCall(JITAssembler::Void, lookup, offsetof(QV4::Lookup, indexedSetter),
-                           JITTargetPlatform::EngineRegister,
-                           PointerToValue(targetBase), PointerToValue(targetIndex),
-                           PointerToValue(source));
-        return;
-    }
-    generateRuntimeCall(_as, JITAssembler::Void, setElement, JITTargetPlatform::EngineRegister,
-                         PointerToValue(targetBase), PointerToValue(targetIndex),
-                         PointerToValue(source));
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::copyValue(IR::Expr *source, IR::Expr *target)
-{
-    IR::Temp *sourceTemp = source->asTemp();
-    IR::Temp *targetTemp = target->asTemp();
-
-    if (sourceTemp && targetTemp && *sourceTemp == *targetTemp)
-        return;
-    if (IR::ArgLocal *sal = source->asArgLocal())
-        if (IR::ArgLocal *tal = target->asArgLocal())
-            if (*sal == *tal)
-                return;
-
-    if (sourceTemp && sourceTemp->kind == IR::Temp::PhysicalRegister) {
-        if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister) {
-            if (sourceTemp->type == IR::DoubleType)
-                _as->moveDouble((FPRegisterID) sourceTemp->index,
-                                (FPRegisterID) targetTemp->index);
-            else
-                _as->move((RegisterID) sourceTemp->index,
-                          (RegisterID) targetTemp->index);
-            return;
-        } else {
-            switch (sourceTemp->type) {
-            case IR::DoubleType:
-                _as->storeDouble((FPRegisterID) sourceTemp->index, target);
-                break;
-            case IR::SInt32Type:
-                _as->storeInt32((RegisterID) sourceTemp->index, target);
-                break;
-            case IR::UInt32Type:
-                _as->storeUInt32((RegisterID) sourceTemp->index, target);
-                break;
-            case IR::BoolType:
-                _as->storeBool((RegisterID) sourceTemp->index, target);
-                break;
-            default:
-                Q_ASSERT(!"Unreachable");
-                break;
-            }
-            return;
-        }
-    } else if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister) {
-        switch (targetTemp->type) {
-        case IR::DoubleType:
-            Q_ASSERT(source->type == IR::DoubleType);
-            _as->toDoubleRegister(source, (FPRegisterID) targetTemp->index);
-            return;
-        case IR::BoolType:
-            Q_ASSERT(source->type == IR::BoolType);
-            _as->toInt32Register(source, (RegisterID) targetTemp->index);
-            return;
-        case IR::SInt32Type:
-            Q_ASSERT(source->type == IR::SInt32Type);
-            _as->toInt32Register(source, (RegisterID) targetTemp->index);
-            return;
-        case IR::UInt32Type:
-            Q_ASSERT(source->type == IR::UInt32Type);
-            _as->toUInt32Register(source, (RegisterID) targetTemp->index);
-            return;
-        default:
-            Q_ASSERT(!"Unreachable");
-            break;
-        }
-    }
-
-    WriteBarrier::Type barrier;
-    Pointer addr = _as->loadAddressForWriting(JITTargetPlatform::ReturnValueRegister, target, &barrier);
-    // The target is not a physical register, nor is the source. So we can do a memory-to-memory copy:
-    _as->memcopyValue(addr, source, JITTargetPlatform::ScratchRegister, barrier);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::swapValues(IR::Expr *source, IR::Expr *target)
-{
-    IR::Temp *sourceTemp = source->asTemp();
-    IR::Temp *targetTemp = target->asTemp();
-
-    if (sourceTemp && sourceTemp->kind == IR::Temp::PhysicalRegister) {
-        if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister) {
-            Q_ASSERT(sourceTemp->type == targetTemp->type);
-
-            if (sourceTemp->type == IR::DoubleType) {
-                _as->moveDouble((FPRegisterID) targetTemp->index, JITTargetPlatform::FPGpr0);
-                _as->moveDouble((FPRegisterID) sourceTemp->index,
-                                (FPRegisterID) targetTemp->index);
-                _as->moveDouble(JITTargetPlatform::FPGpr0, (FPRegisterID) sourceTemp->index);
-            } else {
-                _as->swap((RegisterID) sourceTemp->index,
-                          (RegisterID) targetTemp->index);
-            }
-            return;
-        }
-    } else if (!sourceTemp || sourceTemp->kind == IR::Temp::StackSlot) {
-        if (!targetTemp || targetTemp->kind == IR::Temp::StackSlot) {
-            // Note: a swap for two stack-slots can involve different types.
-            WriteBarrier::Type barrierForSource, barrierForTarget;
-            Pointer sAddr = _as->loadAddressForWriting(JITTargetPlatform::ScratchRegister, source, &barrierForSource);
-            Pointer tAddr = _as->loadAddressForWriting(JITTargetPlatform::ReturnValueRegister, target, &barrierForTarget);
-            _as->loadRawValue(sAddr, JITTargetPlatform::FPGpr0);
-            _as->loadRawValue(tAddr, JITTargetPlatform::FPGpr1);
-            _as->storeRawValue(JITTargetPlatform::FPGpr1, sAddr, barrierForSource);
-            _as->storeRawValue(JITTargetPlatform::FPGpr0, tAddr, barrierForTarget);
-            return;
-        }
-    }
-
-    IR::Expr *memExpr = !sourceTemp || sourceTemp->kind == IR::Temp::StackSlot ? source : target;
-    IR::Temp *regTemp = sourceTemp && sourceTemp->kind == IR::Temp::PhysicalRegister ? sourceTemp
-                                                                                     : targetTemp;
-    Q_ASSERT(memExpr);
-    Q_ASSERT(regTemp);
-
-    WriteBarrier::Type barrier;
-    Pointer addr = _as->loadAddressForWriting(JITTargetPlatform::ReturnValueRegister, memExpr, &barrier);
-    if (regTemp->type == IR::DoubleType) {
-        _as->loadDouble(addr, JITTargetPlatform::FPGpr0);
-        _as->storeDouble((FPRegisterID) regTemp->index, addr, barrier);
-        _as->moveDouble(JITTargetPlatform::FPGpr0, (FPRegisterID) regTemp->index);
-    } else if (regTemp->type == IR::UInt32Type) {
-        _as->toUInt32Register(addr, JITTargetPlatform::ScratchRegister);
-        _as->storeUInt32((RegisterID) regTemp->index, addr, barrier);
-        _as->move(JITTargetPlatform::ScratchRegister, (RegisterID) regTemp->index);
-    } else {
-        _as->load32(addr, JITTargetPlatform::ScratchRegister);
-        _as->store32((RegisterID) regTemp->index, addr);
-        if (regTemp->type != memExpr->type) {
-            addr.offset += 4;
-            quint32 tag;
-            switch (regTemp->type) {
-            case IR::BoolType:
-                tag = quint32(JITAssembler::ValueTypeInternal::Boolean);
-                break;
-            case IR::SInt32Type:
-                tag = quint32(JITAssembler::ValueTypeInternal::Integer);
-                break;
-            default:
-                tag = 31337; // bogus value
-                Q_UNREACHABLE();
-            }
-            _as->store32(TrustedImm32(tag), addr);
-            _as->emitWriteBarrier(addr, barrier);
-        }
-        _as->move(JITTargetPlatform::ScratchRegister, (RegisterID) regTemp->index);
-    }
-}
-
-#define setOp(op, opName, operation) \
-    do { \
-        op = typename JITAssembler::RuntimeCall(QV4::Runtime::operation); opName = "Runtime::" isel_stringIfy(operation); \
-        needsExceptionCheck = QV4::Runtime::Method_##operation##_NeedsExceptionCheck; \
-    } while (0)
-#define setOpContext(op, opName, operation) \
-    do { \
-        opContext = typename JITAssembler::RuntimeCall(QV4::Runtime::operation); opName = "Runtime::" isel_stringIfy(operation); \
-        needsExceptionCheck = QV4::Runtime::Method_##operation##_NeedsExceptionCheck; \
-    } while (0)
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::unop(IR::AluOp oper, IR::Expr *source, IR::Expr *target)
-{
-    QV4::JIT::Unop<JITAssembler> unop(_as, oper);
-    unop.generate(source, target);
-}
-
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::binop(IR::AluOp oper, IR::Expr *leftSource, IR::Expr *rightSource, IR::Expr *target)
-{
-    QV4::JIT::Binop<JITAssembler> binop(_as, oper);
-    binop.generate(leftSource, rightSource, target);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callQmlContextProperty(IR::Expr *base, IR::Member::MemberKind kind, int propertyIndex, IR::ExprList *args, IR::Expr *result)
-{
-    prepareCallData(args, base);
-
-    if (kind == IR::Member::MemberOfQmlScopeObject)
-        generateRuntimeCall(_as, result, callQmlScopeObjectProperty,
-                             JITTargetPlatform::EngineRegister,
-                             TrustedImm32(propertyIndex),
-                             baseAddressForCallData());
-    else if (kind == IR::Member::MemberOfQmlContextObject)
-        generateRuntimeCall(_as, result, callQmlContextObjectProperty,
-                             JITTargetPlatform::EngineRegister,
-                             TrustedImm32(propertyIndex),
-                             baseAddressForCallData());
-    else
-        Q_ASSERT(false);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callProperty(IR::Expr *base, const QString &name, IR::ExprList *args,
-                                        IR::Expr *result)
-{
-    Q_ASSERT(base != 0);
-
-    prepareCallData(args, base);
-
-    if (useFastLookups) {
-        uint index = registerGetterLookup(name);
-        generateRuntimeCall(_as, result, callPropertyLookup,
-                             JITTargetPlatform::EngineRegister,
-                             TrustedImm32(index),
-                             baseAddressForCallData());
-    } else {
-        generateRuntimeCall(_as, result, callProperty, JITTargetPlatform::EngineRegister,
-                             StringToIndex(name),
-                             baseAddressForCallData());
-    }
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::callSubscript(IR::Expr *base, IR::Expr *index, IR::ExprList *args,
-                                         IR::Expr *result)
-{
-    Q_ASSERT(base != 0);
-
-    prepareCallData(args, base);
-    generateRuntimeCall(_as, result, callElement, JITTargetPlatform::EngineRegister,
-                         PointerToValue(index),
-                         baseAddressForCallData());
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::convertType(IR::Expr *source, IR::Expr *target)
-{
-    switch (target->type) {
-    case IR::DoubleType:
-        convertTypeToDouble(source, target);
-        break;
-    case IR::BoolType:
-        convertTypeToBool(source, target);
-        break;
-    case IR::SInt32Type:
-        convertTypeToSInt32(source, target);
-        break;
-    case IR::UInt32Type:
-        convertTypeToUInt32(source, target);
-        break;
-    default:
-        convertTypeSlowPath(source, target);
-        break;
-    }
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::convertTypeSlowPath(IR::Expr *source, IR::Expr *target)
-{
-    Q_ASSERT(target->type != IR::BoolType);
-
-    if (target->type & IR::NumberType)
-        unop(IR::OpUPlus, source, target);
-    else
-        copyValue(source, target);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::convertTypeToDouble(IR::Expr *source, IR::Expr *target)
-{
-    switch (source->type) {
-    case IR::SInt32Type:
-    case IR::BoolType:
-    case IR::NullType:
-        convertIntToDouble(source, target);
-        break;
-    case IR::UInt32Type:
-        convertUIntToDouble(source, target);
-        break;
-    case IR::UndefinedType:
-        _as->loadDouble(_as->loadAddressForReading(JITTargetPlatform::ScratchRegister, source), JITTargetPlatform::FPGpr0);
-        _as->storeDouble(JITTargetPlatform::FPGpr0, target);
-        break;
-    case IR::StringType:
-    case IR::VarType: {
-        // load the tag:
-        Pointer tagAddr = _as->loadAddressForReading(JITTargetPlatform::ScratchRegister, source);
-        tagAddr.offset += 4;
-        _as->load32(tagAddr, JITTargetPlatform::ScratchRegister);
-
-        // check if it's an int32:
-        Jump isNoInt = _as->branch32(RelationalCondition::NotEqual, JITTargetPlatform::ScratchRegister,
-                                     TrustedImm32(quint32(JITAssembler::ValueTypeInternal::Integer)));
-        convertIntToDouble(source, target);
-        Jump intDone = _as->jump();
-
-        // not an int, check if it's NOT a double:
-        isNoInt.link(_as);
-        Jump isDbl = _as->generateIsDoubleCheck(JITTargetPlatform::ScratchRegister);
-
-        generateRuntimeCall(_as, target, toDouble, PointerToValue(source));
-        Jump noDoubleDone = _as->jump();
-
-        // it is a double:
-        isDbl.link(_as);
-        Pointer addr2 = _as->loadAddressForReading(JITTargetPlatform::ScratchRegister, source);
-        IR::Temp *targetTemp = target->asTemp();
-        if (!targetTemp || targetTemp->kind == IR::Temp::StackSlot) {
-            _as->memcopyValue(target, addr2, JITTargetPlatform::FPGpr0, JITTargetPlatform::ReturnValueRegister);
-        } else {
-            _as->loadDouble(addr2, (FPRegisterID) targetTemp->index);
-        }
-
-        noDoubleDone.link(_as);
-        intDone.link(_as);
-    } break;
-    default:
-        convertTypeSlowPath(source, target);
-        break;
-    }
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::convertTypeToBool(IR::Expr *source, IR::Expr *target)
-{
-    IR::Temp *sourceTemp = source->asTemp();
-    switch (source->type) {
-    case IR::SInt32Type:
-    case IR::UInt32Type:
-        convertIntToBool(source, target);
-        break;
-    case IR::DoubleType: {
-        // The source is in a register if the register allocator is used. If the register
-        // allocator was not used, then that means that we can use any register for to
-        // load the double into.
-        FPRegisterID reg;
-        if (sourceTemp && sourceTemp->kind == IR::Temp::PhysicalRegister)
-            reg = (FPRegisterID) sourceTemp->index;
-        else
-            reg = _as->toDoubleRegister(source, (FPRegisterID) 1);
-        Jump nonZero = _as->branchDoubleNonZero(reg, JITTargetPlatform::FPGpr0);
-
-        // it's 0, so false:
-        _as->storeBool(false, target);
-        Jump done = _as->jump();
-
-        // it's non-zero, so true:
-        nonZero.link(_as);
-        _as->storeBool(true, target);
-
-        // done:
-        done.link(_as);
-    } break;
-    case IR::UndefinedType:
-    case IR::NullType:
-        _as->storeBool(false, target);
-        break;
-    case IR::StringType:
-        generateRuntimeCall(_as, JITTargetPlatform::ReturnValueRegister, toBoolean,
-                            PointerToValue(source));
-        _as->storeBool(JITTargetPlatform::ReturnValueRegister, target);
-        Q_FALLTHROUGH();
-    case IR::VarType:
-    default:
-        Pointer addr = _as->loadAddressForReading(JITTargetPlatform::ScratchRegister, source);
-        Pointer tagAddr = addr;
-        tagAddr.offset += 4;
-        _as->load32(tagAddr, JITTargetPlatform::ReturnValueRegister);
-
-        // checkif it's a bool:
-        Jump notBool = _as->branch32(RelationalCondition::NotEqual, JITTargetPlatform::ReturnValueRegister,
-                                     TrustedImm32(quint32(JITAssembler::ValueTypeInternal::Boolean)));
-        _as->load32(addr, JITTargetPlatform::ReturnValueRegister);
-        Jump boolDone = _as->jump();
-        // check if it's an int32:
-        notBool.link(_as);
-        Jump fallback = _as->branch32(RelationalCondition::NotEqual, JITTargetPlatform::ReturnValueRegister,
-                                      TrustedImm32(quint32(JITAssembler::ValueTypeInternal::Integer)));
-        _as->load32(addr, JITTargetPlatform::ReturnValueRegister);
-        Jump isZero = _as->branch32(RelationalCondition::Equal, JITTargetPlatform::ReturnValueRegister,
-                                               TrustedImm32(0));
-        _as->move(TrustedImm32(1), JITTargetPlatform::ReturnValueRegister);
-        Jump intDone = _as->jump();
-
-        // not an int:
-        fallback.link(_as);
-        generateRuntimeCall(_as, JITTargetPlatform::ReturnValueRegister, toBoolean,
-                            PointerToValue(source));
-
-        isZero.link(_as);
-        intDone.link(_as);
-        boolDone.link(_as);
-        _as->storeBool(JITTargetPlatform::ReturnValueRegister, target);
-
-        break;
-    }
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::convertTypeToSInt32(IR::Expr *source, IR::Expr *target)
-{
-    switch (source->type) {
-    case IR::VarType: {
-        JITAssembler::RegisterSizeDependentOps::convertVarToSInt32(_as, source, target);
-    } break;
-    case IR::DoubleType: {
-        Jump success =
-                _as->branchTruncateDoubleToInt32(_as->toDoubleRegister(source),
-                                                 JITTargetPlatform::ReturnValueRegister,
-                                                 BranchTruncateType::BranchIfTruncateSuccessful);
-        generateRuntimeCall(_as, JITTargetPlatform::ReturnValueRegister, doubleToInt,
-                             PointerToValue(source));
-        success.link(_as);
-        _as->storeInt32(JITTargetPlatform::ReturnValueRegister, target);
-    } break;
-    case IR::UInt32Type:
-        _as->storeInt32(_as->toUInt32Register(source, JITTargetPlatform::ReturnValueRegister), target);
-        break;
-    case IR::NullType:
-    case IR::UndefinedType:
-        _as->move(TrustedImm32(0), JITTargetPlatform::ReturnValueRegister);
-        _as->storeInt32(JITTargetPlatform::ReturnValueRegister, target);
-        break;
-    case IR::BoolType:
-        _as->storeInt32(_as->toInt32Register(source, JITTargetPlatform::ReturnValueRegister), target);
-        break;
-    case IR::StringType:
-    default:
-        generateRuntimeCall(_as, JITTargetPlatform::ReturnValueRegister, toInt,
-                             _as->loadAddressForReading(JITTargetPlatform::ScratchRegister, source));
-        _as->storeInt32(JITTargetPlatform::ReturnValueRegister, target);
-        break;
-    } // switch (source->type)
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::convertTypeToUInt32(IR::Expr *source, IR::Expr *target)
-{
-    switch (source->type) {
-    case IR::VarType: {
-        // load the tag:
-        Pointer tagAddr = _as->loadAddressForReading(JITTargetPlatform::ScratchRegister, source);
-        tagAddr.offset += 4;
-        _as->load32(tagAddr, JITTargetPlatform::ScratchRegister);
-
-        // check if it's an int32:
-        Jump isNoInt = _as->branch32(RelationalCondition::NotEqual, JITTargetPlatform::ScratchRegister,
-                                     TrustedImm32(quint32(JITAssembler::ValueTypeInternal::Integer)));
-        Pointer addr = _as->loadAddressForReading(JITTargetPlatform::ScratchRegister, source);
-        _as->storeUInt32(_as->toInt32Register(addr, JITTargetPlatform::ScratchRegister), target);
-        Jump intDone = _as->jump();
-
-        // not an int:
-        isNoInt.link(_as);
-        generateRuntimeCall(_as, JITTargetPlatform::ReturnValueRegister, toUInt,
-                             _as->loadAddressForReading(JITTargetPlatform::ScratchRegister, source));
-        _as->storeInt32(JITTargetPlatform::ReturnValueRegister, target);
-
-        intDone.link(_as);
-    } break;
-    case IR::DoubleType: {
-        FPRegisterID reg = _as->toDoubleRegister(source);
-        Jump success =
-                _as->branchTruncateDoubleToUint32(reg, JITTargetPlatform::ReturnValueRegister,
-                                                  BranchTruncateType::BranchIfTruncateSuccessful);
-        generateRuntimeCall(_as, JITTargetPlatform::ReturnValueRegister, doubleToUInt,
-                             PointerToValue(source));
-        success.link(_as);
-        _as->storeUInt32(JITTargetPlatform::ReturnValueRegister, target);
-    } break;
-    case IR::NullType:
-    case IR::UndefinedType:
-        _as->move(TrustedImm32(0), JITTargetPlatform::ReturnValueRegister);
-        _as->storeUInt32(JITTargetPlatform::ReturnValueRegister, target);
-        break;
-    case IR::StringType:
-        generateRuntimeCall(_as, JITTargetPlatform::ReturnValueRegister, toUInt,
-                             PointerToValue(source));
-        _as->storeUInt32(JITTargetPlatform::ReturnValueRegister, target);
-        break;
-    case IR::SInt32Type:
-    case IR::BoolType:
-        _as->storeUInt32(_as->toInt32Register(source, JITTargetPlatform::ReturnValueRegister), target);
-        break;
-    default:
-        break;
-    } // switch (source->type)
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::constructActivationProperty(IR::Name *func, IR::ExprList *args, IR::Expr *result)
-{
-    Q_ASSERT(func != 0);
-    prepareCallData(args, 0);
-
-    if (useFastLookups && func->global) {
-        uint index = registerGlobalGetterLookup(*func->id);
-        generateRuntimeCall(_as, result, constructGlobalLookup,
-                             JITTargetPlatform::EngineRegister,
-                             TrustedImm32(index), baseAddressForCallData());
-        return;
-    }
-
-    generateRuntimeCall(_as, result, constructActivationProperty,
-                         JITTargetPlatform::EngineRegister,
-                         StringToIndex(*func->id),
-                         baseAddressForCallData());
-}
-
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::constructProperty(IR::Expr *base, const QString &name, IR::ExprList *args, IR::Expr *result)
-{
-    prepareCallData(args, base);
-    if (useFastLookups) {
-        uint index = registerGetterLookup(name);
-        generateRuntimeCall(_as, result, constructPropertyLookup,
-                             JITTargetPlatform::EngineRegister,
-                             TrustedImm32(index),
-                             baseAddressForCallData());
-        return;
-    }
-
-    generateRuntimeCall(_as, result, constructProperty, JITTargetPlatform::EngineRegister,
-                         StringToIndex(name),
-                         baseAddressForCallData());
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::constructValue(IR::Expr *value, IR::ExprList *args, IR::Expr *result)
-{
-    Q_ASSERT(value != 0);
-
-    prepareCallData(args, 0);
-    generateRuntimeCall(_as, result, constructValue,
-                         JITTargetPlatform::EngineRegister,
-                         Reference(value),
-                         baseAddressForCallData());
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::visitJump(IR::Jump *s)
-{
-    if (!_removableJumps.at(_block->index()))
-        _as->jumpToBlock(_block, s->target);
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::visitCJump(IR::CJump *s)
-{
-    IR::Temp *t = s->cond->asTemp();
-    if (t || s->cond->asArgLocal()) {
-        RegisterID reg;
-        if (t && t->kind == IR::Temp::PhysicalRegister) {
-            Q_ASSERT(t->type == IR::BoolType);
-            reg = (RegisterID) t->index;
-        } else if (t && t->kind == IR::Temp::StackSlot && t->type == IR::BoolType) {
-            reg = JITTargetPlatform::ReturnValueRegister;
-            _as->toInt32Register(t, reg);
-        } else {
-            Address temp = _as->loadAddressForReading(JITTargetPlatform::ScratchRegister, s->cond);
-            Address tag = temp;
-            tag.offset += QV4::Value::tagOffset();
-            Jump booleanConversion = _as->branch32(RelationalCondition::NotEqual, tag,
-                                                   TrustedImm32(quint32(JITAssembler::ValueTypeInternal::Boolean)));
-
-            Address data = temp;
-            data.offset += QV4::Value::valueOffset();
-            _as->load32(data, JITTargetPlatform::ReturnValueRegister);
-            Jump testBoolean = _as->jump();
-
-            booleanConversion.link(_as);
-            reg = JITTargetPlatform::ReturnValueRegister;
-            generateRuntimeCall(_as, reg, toBoolean, Reference(s->cond));
-
-            testBoolean.link(_as);
-        }
-
-        _as->generateCJumpOnNonZero(reg, _block, s->iftrue, s->iffalse);
-        return;
-    } else if (IR::Const *c = s->cond->asConst()) {
-        // TODO: SSA optimization for constant condition evaluation should remove this.
-        // See also visitCJump() in RegAllocInfo.
-        generateRuntimeCall(_as, JITTargetPlatform::ReturnValueRegister, toBoolean,
-                             PointerToValue(c));
-        _as->generateCJumpOnNonZero(JITTargetPlatform::ReturnValueRegister, _block, s->iftrue, s->iffalse);
-        return;
-    } else if (IR::Binop *b = s->cond->asBinop()) {
-        if (b->left->type == IR::DoubleType && b->right->type == IR::DoubleType
-                && visitCJumpDouble(b->op, b->left, b->right, s->iftrue, s->iffalse))
-            return;
-
-        if (b->left->type == IR::SInt32Type && b->right->type == IR::SInt32Type
-                && visitCJumpSInt32(b->op, b->left, b->right, s->iftrue, s->iffalse))
-            return;
-
-        if (b->op == IR::OpStrictEqual || b->op == IR::OpStrictNotEqual) {
-            visitCJumpStrict(b, s->iftrue, s->iffalse);
-            return;
-        }
-        if (b->op == IR::OpEqual || b->op == IR::OpNotEqual) {
-            visitCJumpEqual(b, s->iftrue, s->iffalse);
-            return;
-        }
-
-        typename JITAssembler::RuntimeCall op;
-        typename JITAssembler::RuntimeCall opContext;
-        const char *opName = 0;
-        bool needsExceptionCheck;
-        switch (b->op) {
-        default: Q_UNREACHABLE(); Q_ASSERT(!"todo"); break;
-        case IR::OpGt: setOp(op, opName, compareGreaterThan); break;
-        case IR::OpLt: setOp(op, opName, compareLessThan); break;
-        case IR::OpGe: setOp(op, opName, compareGreaterEqual); break;
-        case IR::OpLe: setOp(op, opName, compareLessEqual); break;
-        case IR::OpEqual: setOp(op, opName, compareEqual); break;
-        case IR::OpNotEqual: setOp(op, opName, compareNotEqual); break;
-        case IR::OpStrictEqual: setOp(op, opName, compareStrictEqual); break;
-        case IR::OpStrictNotEqual: setOp(op, opName, compareStrictNotEqual); break;
-        case IR::OpInstanceof: setOpContext(op, opName, compareInstanceof); break;
-        case IR::OpIn: setOpContext(op, opName, compareIn); break;
-        } // switch
-
-        // TODO: in SSA optimization, do constant expression evaluation.
-        // The case here is, for example:
-        //   if (true === true) .....
-        // Of course, after folding the CJUMP to a JUMP, dead-code (dead-basic-block)
-        // elimination (which isn't there either) would remove the whole else block.
-        if (opContext.isValid())
-            _as->generateFunctionCallImp(needsExceptionCheck,
-                                         JITTargetPlatform::ReturnValueRegister, opName, opContext,
-                                         JITTargetPlatform::EngineRegister,
-                                         PointerToValue(b->left),
-                                         PointerToValue(b->right));
-        else
-            _as->generateFunctionCallImp(needsExceptionCheck,
-                                         JITTargetPlatform::ReturnValueRegister, opName, op,
-                                         PointerToValue(b->left),
-                                         PointerToValue(b->right));
-
-        _as->generateCJumpOnNonZero(JITTargetPlatform::ReturnValueRegister, _block, s->iftrue, s->iffalse);
-        return;
-    }
-    Q_UNREACHABLE();
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::visitRet(IR::Ret *s)
-{
-    _as->returnFromFunction(s, regularRegistersToSave, fpRegistersToSave);
-}
-
-template <typename JITAssembler>
-int InstructionSelection<JITAssembler>::prepareVariableArguments(IR::ExprList* args)
-{
-    int argc = 0;
-    for (IR::ExprList *it = args; it; it = it->next) {
-        ++argc;
-    }
-
-    int i = 0;
-    for (IR::ExprList *it = args; it; it = it->next, ++i) {
-        IR::Expr *arg = it->expr;
-        Q_ASSERT(arg != 0);
-        Pointer dst(_as->stackLayout().argumentAddressForCall(i));
-        if (arg->asTemp() && arg->asTemp()->kind != IR::Temp::PhysicalRegister)
-            _as->memcopyValue(dst, arg->asTemp(), JITTargetPlatform::ScratchRegister, WriteBarrier::NoBarrier);
-        else
-            _as->copyValue(dst, arg, WriteBarrier::NoBarrier);
-    }
-
-    return argc;
-}
-
-template <typename JITAssembler>
-int InstructionSelection<JITAssembler>::prepareCallData(IR::ExprList* args, IR::Expr *thisObject)
-{
-    int argc = 0;
-    for (IR::ExprList *it = args; it; it = it->next) {
-        ++argc;
-    }
-
-    Pointer p = _as->stackLayout().callDataAddress(offsetof(CallData, tag));
-    _as->store32(TrustedImm32(quint32(JITAssembler::ValueTypeInternal::Integer)), p);
-    p = _as->stackLayout().callDataAddress(offsetof(CallData, argc));
-    _as->store32(TrustedImm32(argc), p);
-    p = _as->stackLayout().callDataAddress(offsetof(CallData, thisObject));
-    if (!thisObject)
-        _as->storeValue(JITAssembler::TargetPrimitive::undefinedValue(), p, WriteBarrier::NoBarrier);
-    else
-        _as->copyValue(p, thisObject, WriteBarrier::NoBarrier);
-
-    int i = 0;
-    for (IR::ExprList *it = args; it; it = it->next, ++i) {
-        IR::Expr *arg = it->expr;
-        Q_ASSERT(arg != 0);
-        Pointer dst(_as->stackLayout().argumentAddressForCall(i));
-        if (arg->asTemp() && arg->asTemp()->kind != IR::Temp::PhysicalRegister)
-            _as->memcopyValue(dst, arg->asTemp(), JITTargetPlatform::ScratchRegister, WriteBarrier::NoBarrier);
-        else
-            _as->copyValue(dst, arg, WriteBarrier::NoBarrier);
-    }
-    return argc;
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::calculateRegistersToSave(const RegisterInformation &used)
-{
-    regularRegistersToSave.clear();
-    fpRegistersToSave.clear();
-
-    for (const RegisterInfo &ri : JITTargetPlatform::getRegisterInfo()) {
-        if (JITTargetPlatform::gotRegister != -1 && ri.isRegularRegister() && ri.reg<RegisterID>() == JITTargetPlatform::gotRegister) {
-            regularRegistersToSave.append(ri);
-            continue;
-        }
-        if (ri.isCallerSaved())
-            continue;
-        if (ri.isRegularRegister()) {
-            if (ri.isPredefined() || used.contains(ri))
-                regularRegistersToSave.append(ri);
-        } else {
-            Q_ASSERT(ri.isFloatingPoint());
-            if (ri.isPredefined() || used.contains(ri))
-                fpRegistersToSave.append(ri);
-        }
-    }
-}
-
-QT_BEGIN_NAMESPACE
-namespace QV4 {
-bool operator==(const Primitive &v1, const Primitive &v2)
-{
-    return v1.rawValue() == v2.rawValue();
-}
-} // QV4 namespace
-QT_END_NAMESPACE
-
-template <typename JITAssembler>
-bool InstructionSelection<JITAssembler>::visitCJumpDouble(IR::AluOp op, IR::Expr *left, IR::Expr *right,
-                                            IR::BasicBlock *iftrue, IR::BasicBlock *iffalse)
-{
-    if (_as->nextBlock() == iftrue) {
-        Jump target = _as->branchDouble(true, op, left, right);
-        _as->addPatch(iffalse, target);
-    } else {
-        Jump target = _as->branchDouble(false, op, left, right);
-        _as->addPatch(iftrue, target);
-        _as->jumpToBlock(_block, iffalse);
-    }
-    return true;
-}
-
-template <typename JITAssembler>
-bool InstructionSelection<JITAssembler>::visitCJumpSInt32(IR::AluOp op, IR::Expr *left, IR::Expr *right,
-                                            IR::BasicBlock *iftrue, IR::BasicBlock *iffalse)
-{
-    if (_as->nextBlock() == iftrue) {
-        Jump target = _as->branchInt32(true, op, left, right);
-        _as->addPatch(iffalse, target);
-    } else {
-        Jump target = _as->branchInt32(false, op, left, right);
-        _as->addPatch(iftrue, target);
-        _as->jumpToBlock(_block, iffalse);
-    }
-    return true;
-}
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::visitCJumpStrict(IR::Binop *binop, IR::BasicBlock *trueBlock,
-                                            IR::BasicBlock *falseBlock)
-{
-    Q_ASSERT(binop->op == IR::OpStrictEqual || binop->op == IR::OpStrictNotEqual);
-
-    if (visitCJumpStrictNull(binop, trueBlock, falseBlock))
-        return;
-    if (visitCJumpStrictUndefined(binop, trueBlock, falseBlock))
-        return;
-    if (visitCJumpStrictBool(binop, trueBlock, falseBlock))
-        return;
-
-    IR::Expr *left = binop->left;
-    IR::Expr *right = binop->right;
-
-    generateRuntimeCall(_as, JITTargetPlatform::ReturnValueRegister, compareStrictEqual,
-                                 PointerToValue(left), PointerToValue(right));
-    _as->generateCJumpOnCompare(binop->op == IR::OpStrictEqual ? RelationalCondition::NotEqual : RelationalCondition::Equal,
-                                JITTargetPlatform::ReturnValueRegister, TrustedImm32(0),
-                                _block, trueBlock, falseBlock);
-}
-
-// Only load the non-null temp.
-template <typename JITAssembler>
-bool InstructionSelection<JITAssembler>::visitCJumpStrictNull(IR::Binop *binop,
-                                                IR::BasicBlock *trueBlock,
-                                                IR::BasicBlock *falseBlock)
-{
-    IR::Expr *varSrc = 0;
-    if (binop->left->type == IR::VarType && binop->right->type == IR::NullType)
-        varSrc = binop->left;
-    else if (binop->left->type == IR::NullType && binop->right->type == IR::VarType)
-        varSrc = binop->right;
-    if (!varSrc)
-        return false;
-
-    if (varSrc->asTemp() && varSrc->asTemp()->kind == IR::Temp::PhysicalRegister) {
-        _as->jumpToBlock(_block, falseBlock);
-        return true;
-    }
-
-    if (IR::Const *c = varSrc->asConst()) {
-        if (c->type == IR::NullType)
-            _as->jumpToBlock(_block, trueBlock);
-        else
-            _as->jumpToBlock(_block, falseBlock);
-        return true;
-    }
-
-    Pointer tagAddr = _as->loadAddressForReading(JITTargetPlatform::ScratchRegister, varSrc);
-    tagAddr.offset += 4;
-    const RegisterID tagReg = JITTargetPlatform::ScratchRegister;
-    _as->load32(tagAddr, tagReg);
-
-    RelationalCondition cond = binop->op == IR::OpStrictEqual ? RelationalCondition::Equal
-                                                                         : RelationalCondition::NotEqual;
-    const TrustedImm32 tag{quint32(JITAssembler::ValueTypeInternal::Null)};
-    _as->generateCJumpOnCompare(cond, tagReg, tag, _block, trueBlock, falseBlock);
-    return true;
-}
-
-template <typename JITAssembler>
-bool InstructionSelection<JITAssembler>::visitCJumpStrictUndefined(IR::Binop *binop,
-                                                     IR::BasicBlock *trueBlock,
-                                                     IR::BasicBlock *falseBlock)
-{
-    IR::Expr *varSrc = 0;
-    if (binop->left->type == IR::VarType && binop->right->type == IR::UndefinedType)
-        varSrc = binop->left;
-    else if (binop->left->type == IR::UndefinedType && binop->right->type == IR::VarType)
-        varSrc = binop->right;
-    if (!varSrc)
-        return false;
-
-    if (varSrc->asTemp() && varSrc->asTemp()->kind == IR::Temp::PhysicalRegister) {
-        _as->jumpToBlock(_block, falseBlock);
-        return true;
-    }
-
-    if (IR::Const *c = varSrc->asConst()) {
-        if (c->type == IR::UndefinedType)
-            _as->jumpToBlock(_block, trueBlock);
-        else
-            _as->jumpToBlock(_block, falseBlock);
-        return true;
-    }
-
-    RelationalCondition cond = binop->op == IR::OpStrictEqual ? RelationalCondition::Equal
-                                                                         : RelationalCondition::NotEqual;
-    const RegisterID tagReg = JITTargetPlatform::ReturnValueRegister;
-    _as->generateCJumpOnUndefined(cond, varSrc, JITTargetPlatform::ScratchRegister, tagReg, _block, trueBlock, falseBlock);
-    return true;
-}
-
-template <typename JITAssembler>
-bool InstructionSelection<JITAssembler>::visitCJumpStrictBool(IR::Binop *binop, IR::BasicBlock *trueBlock,
-                                                IR::BasicBlock *falseBlock)
-{
-    IR::Expr *boolSrc = 0, *otherSrc = 0;
-    if (binop->left->type == IR::BoolType) {
-        boolSrc = binop->left;
-        otherSrc = binop->right;
-    } else if (binop->right->type == IR::BoolType) {
-        boolSrc = binop->right;
-        otherSrc = binop->left;
-    } else {
-        // neither operands are statically typed as bool, so bail out.
-        return false;
-    }
-    if (otherSrc->type == IR::UnknownType) {
-        // Ok, we really need to call into the runtime.
-        // (This case doesn't happen when the optimizer ran, because everything will be typed (yes,
-        // possibly as "var" meaning anything), but it does happen for $0===true, which is generated
-        // for things where the optimizer didn't run (like functions with a try block).)
-        return false;
-    }
-
-    RelationalCondition cond = binop->op == IR::OpStrictEqual ? RelationalCondition::Equal
-                                                              : RelationalCondition::NotEqual;
-
-    if (otherSrc->type == IR::BoolType) { // both are boolean
-        RegisterID one = _as->toBoolRegister(boolSrc, JITTargetPlatform::ReturnValueRegister);
-        RegisterID two = _as->toBoolRegister(otherSrc, JITTargetPlatform::ScratchRegister);
-        _as->generateCJumpOnCompare(cond, one, two, _block, trueBlock, falseBlock);
-        return true;
-    }
-
-    if (otherSrc->type != IR::VarType) {
-        _as->jumpToBlock(_block, falseBlock);
-        return true;
-    }
-
-    Pointer otherAddr = _as->loadAddressForReading(JITTargetPlatform::ReturnValueRegister, otherSrc);
-    otherAddr.offset += 4; // tag address
-
-    // check if the tag of the var operand is indicates 'boolean'
-    _as->load32(otherAddr, JITTargetPlatform::ScratchRegister);
-    Jump noBool = _as->branch32(RelationalCondition::NotEqual, JITTargetPlatform::ScratchRegister,
-                                TrustedImm32(quint32(JITAssembler::ValueTypeInternal::Boolean)));
-    if (binop->op == IR::OpStrictEqual)
-        _as->addPatch(falseBlock, noBool);
-    else
-        _as->addPatch(trueBlock, noBool);
-
-    // ok, both are boolean, so let's load them and compare them.
-    otherAddr.offset -= 4; // int_32 address
-    _as->load32(otherAddr, JITTargetPlatform::ReturnValueRegister);
-    RegisterID boolReg = _as->toBoolRegister(boolSrc, JITTargetPlatform::ScratchRegister);
-    _as->generateCJumpOnCompare(cond, boolReg, JITTargetPlatform::ReturnValueRegister, _block, trueBlock,
-                                falseBlock);
-    return true;
-}
-
-template <typename JITAssembler>
-bool InstructionSelection<JITAssembler>::visitCJumpNullUndefined(IR::Type nullOrUndef, IR::Binop *binop,
-                                                         IR::BasicBlock *trueBlock,
-                                                         IR::BasicBlock *falseBlock)
-{
-    Q_ASSERT(nullOrUndef == IR::NullType || nullOrUndef == IR::UndefinedType);
-
-    IR::Expr *varSrc = 0;
-    if (binop->left->type == IR::VarType && binop->right->type == nullOrUndef)
-        varSrc = binop->left;
-    else if (binop->left->type == nullOrUndef && binop->right->type == IR::VarType)
-        varSrc = binop->right;
-    if (!varSrc)
-        return false;
-
-    if (varSrc->asTemp() && varSrc->asTemp()->kind == IR::Temp::PhysicalRegister) {
-        _as->jumpToBlock(_block, falseBlock);
-        return true;
-    }
-
-    if (IR::Const *c = varSrc->asConst()) {
-        if (c->type == nullOrUndef)
-            _as->jumpToBlock(_block, trueBlock);
-        else
-            _as->jumpToBlock(_block, falseBlock);
-        return true;
-    }
-
-    Pointer tagAddr = _as->loadAddressForReading(JITTargetPlatform::ScratchRegister, varSrc);
-    tagAddr.offset += 4;
-    const RegisterID tagReg = JITTargetPlatform::ReturnValueRegister;
-    _as->load32(tagAddr, tagReg);
-
-    if (binop->op == IR::OpNotEqual)
-        qSwap(trueBlock, falseBlock);
-    Jump isNull = _as->branch32(RelationalCondition::Equal, tagReg, TrustedImm32(quint32(JITAssembler::ValueTypeInternal::Null)));
-    Jump isNotUndefinedTag = _as->branch32(RelationalCondition::NotEqual, tagReg, TrustedImm32(int(QV4::Value::Managed_Type_Internal)));
-    tagAddr.offset -= 4;
-    _as->load32(tagAddr, tagReg);
-    Jump isNotUndefinedValue = _as->branch32(RelationalCondition::NotEqual, tagReg, TrustedImm32(0));
-    _as->addPatch(trueBlock, isNull);
-    _as->addPatch(falseBlock, isNotUndefinedTag);
-    _as->addPatch(falseBlock, isNotUndefinedValue);
-    _as->jumpToBlock(_block, trueBlock);
-
-    return true;
-}
-
-
-template <typename JITAssembler>
-void InstructionSelection<JITAssembler>::visitCJumpEqual(IR::Binop *binop, IR::BasicBlock *trueBlock,
-                                            IR::BasicBlock *falseBlock)
-{
-    Q_ASSERT(binop->op == IR::OpEqual || binop->op == IR::OpNotEqual);
-
-    if (visitCJumpNullUndefined(IR::NullType, binop, trueBlock, falseBlock))
-        return;
-
-    IR::Expr *left = binop->left;
-    IR::Expr *right = binop->right;
-
-    generateRuntimeCall(_as, JITTargetPlatform::ReturnValueRegister, compareEqual,
-                                 PointerToValue(left), PointerToValue(right));
-    _as->generateCJumpOnCompare(binop->op == IR::OpEqual ? RelationalCondition::NotEqual : RelationalCondition::Equal,
-                                JITTargetPlatform::ReturnValueRegister, TrustedImm32(0),
-                                _block, trueBlock, falseBlock);
-}
-
-template <typename JITAssembler>
-QQmlRefPointer<CompiledData::CompilationUnit> ISelFactory<JITAssembler>::createUnitForLoading()
-{
-    QQmlRefPointer<CompiledData::CompilationUnit> result;
-    result.adopt(new JIT::CompilationUnit);
-    return result;
-}
-
-#endif // ENABLE(ASSEMBLER)
-
-QT_BEGIN_NAMESPACE
-namespace QV4 { namespace JIT {
-#if ENABLE(ASSEMBLER)
-template class Q_QML_EXPORT InstructionSelection<>;
-template class Q_QML_EXPORT ISelFactory<>;
-#endif
-
-#if defined(V4_BOOTSTRAP)
-
-Q_QML_EXPORT QV4::EvalISelFactory *createISelForArchitecture(const QString &architecture)
-{
-#if ENABLE(ASSEMBLER)
-    using ARMv7CrossAssembler = QV4::JIT::Assembler<AssemblerTargetConfiguration<JSC::MacroAssemblerARMv7, NoOperatingSystemSpecialization>>;
-    using ARM64CrossAssembler = QV4::JIT::Assembler<AssemblerTargetConfiguration<JSC::MacroAssemblerARM64, NoOperatingSystemSpecialization>>;
-
-    if (architecture == QLatin1String("arm"))
-        return new ISelFactory<ARMv7CrossAssembler>;
-    else if (architecture == QLatin1String("arm64"))
-        return new ISelFactory<ARM64CrossAssembler>;
-
-    QString hostArch;
-#if CPU(ARM_THUMB2)
-    hostArch = QStringLiteral("arm");
-#elif CPU(MIPS)
-    hostArch = QStringLiteral("mips");
-#elif CPU(X86)
-    hostArch = QStringLiteral("i386");
-#elif CPU(X86_64)
-    hostArch = QStringLiteral("x86_64");
-#endif
-    if (!hostArch.isEmpty() && architecture == hostArch)
-        return new ISelFactory<>;
-#endif // ENABLE(ASSEMBLER)
-
-    return nullptr;
-}
-
-#endif
-} }
-QT_END_NAMESPACE
-
diff --git a/src/qml/jit/qv4isel_masm_p.h b/src/qml/jit/qv4isel_masm_p.h
deleted file mode 100644
index 869f857c41..0000000000
--- a/src/qml/jit/qv4isel_masm_p.h
+++ /dev/null
@@ -1,319 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-#ifndef QV4ISEL_MASM_P_H
-#define QV4ISEL_MASM_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include "private/qv4global_p.h"
-#include "private/qv4jsir_p.h"
-#include "private/qv4isel_p.h"
-#include "private/qv4isel_util_p.h"
-#include "private/qv4util_p.h"
-#include "private/qv4value_p.h"
-#include "private/qv4lookup_p.h"
-
-#include <QtCore/QHash>
-#include <QtCore/QStack>
-#include <config.h>
-#include <wtf/Vector.h>
-
-#include "qv4assembler_p.h"
-
-#if ENABLE(ASSEMBLER)
-
-QT_BEGIN_NAMESPACE
-
-namespace QV4 {
-namespace JIT {
-
-template <typename JITAssembler = Assembler<DefaultAssemblerTargetConfiguration>>
-class Q_QML_EXPORT InstructionSelection:
-        protected IR::IRDecoder,
-        public EvalInstructionSelection
-{
-public:
-    InstructionSelection(QQmlEnginePrivate *qmlEngine, QV4::ExecutableAllocator *execAllocator, IR::Module *module, QV4::Compiler::JSUnitGenerator *jsGenerator, EvalISelFactory *iselFactory);
-    ~InstructionSelection();
-
-    void run(int functionIndex) override;
-
-protected:
-    QQmlRefPointer<QV4::CompiledData::CompilationUnit> backendCompileStep() override;
-
-    void callBuiltinInvalid(IR::Name *func, IR::ExprList *args, IR::Expr *result) override;
-    void callBuiltinTypeofQmlContextProperty(IR::Expr *base, IR::Member::MemberKind kind, int propertyIndex, IR::Expr *result) override;
-    void callBuiltinTypeofMember(IR::Expr *base, const QString &name, IR::Expr *result) override;
-    void callBuiltinTypeofSubscript(IR::Expr *base, IR::Expr *index, IR::Expr *result) override;
-    void callBuiltinTypeofName(const QString &name, IR::Expr *result) override;
-    void callBuiltinTypeofValue(IR::Expr *value, IR::Expr *result) override;
-    void callBuiltinDeleteMember(IR::Expr *base, const QString &name, IR::Expr *result) override;
-    void callBuiltinDeleteSubscript(IR::Expr *base, IR::Expr *index, IR::Expr *result) override;
-    void callBuiltinDeleteName(const QString &name, IR::Expr *result) override;
-    void callBuiltinDeleteValue(IR::Expr *result) override;
-    void callBuiltinThrow(IR::Expr *arg) override;
-    void callBuiltinReThrow() override;
-    void callBuiltinUnwindException(IR::Expr *) override;
-    void callBuiltinPushCatchScope(const QString &exceptionName) override;
-    void callBuiltinForeachIteratorObject(IR::Expr *arg, IR::Expr *result) override;
-    void callBuiltinForeachNextPropertyname(IR::Expr *arg, IR::Expr *result) override;
-    void callBuiltinPushWithScope(IR::Expr *arg) override;
-    void callBuiltinPopScope() override;
-    void callBuiltinDeclareVar(bool deletable, const QString &name) override;
-    void callBuiltinDefineArray(IR::Expr *result, IR::ExprList *args) override;
-    void callBuiltinDefineObjectLiteral(IR::Expr *result, int keyValuePairCount, IR::ExprList *keyValuePairs, IR::ExprList *arrayEntries, bool needSparseArray) override;
-    void callBuiltinSetupArgumentObject(IR::Expr *result) override;
-    void callBuiltinConvertThisToObject() override;
-    void callValue(IR::Expr *value, IR::ExprList *args, IR::Expr *result) override;
-    void callQmlContextProperty(IR::Expr *base, IR::Member::MemberKind kind, int propertyIndex, IR::ExprList *args, IR::Expr *result) override;
-    void callProperty(IR::Expr *base, const QString &name, IR::ExprList *args, IR::Expr *result) override;
-    void callSubscript(IR::Expr *base, IR::Expr *index, IR::ExprList *args, IR::Expr *result) override;
-    void convertType(IR::Expr *source, IR::Expr *target) override;
-    void loadThisObject(IR::Expr *temp) override;
-    void loadQmlContext(IR::Expr *target) override;
-    void loadQmlImportedScripts(IR::Expr *target) override;
-    void loadQmlSingleton(const QString &name, IR::Expr *target) override;
-    void loadConst(IR::Const *sourceConst, IR::Expr *target) override;
-    void loadString(const QString &str, IR::Expr *target) override;
-    void loadRegexp(IR::RegExp *sourceRegexp, IR::Expr *target) override;
-    void getActivationProperty(const IR::Name *name, IR::Expr *target) override;
-    void setActivationProperty(IR::Expr *source, const QString &targetName) override;
-    void initClosure(IR::Closure *closure, IR::Expr *target) override;
-    void getProperty(IR::Expr *base, const QString &name, IR::Expr *target) override;
-    void getQmlContextProperty(IR::Expr *source, IR::Member::MemberKind kind, int index, bool captureRequired, IR::Expr *target) override;
-    void getQObjectProperty(IR::Expr *base, int propertyIndex, bool captureRequired, bool isSingleton, int attachedPropertiesId, IR::Expr *target) override;
-    void setProperty(IR::Expr *source, IR::Expr *targetBase, const QString &targetName) override;
-    void setQmlContextProperty(IR::Expr *source, IR::Expr *targetBase, IR::Member::MemberKind kind, int propertyIndex) override;
-    void setQObjectProperty(IR::Expr *source, IR::Expr *targetBase, int propertyIndex) override;
-    void getElement(IR::Expr *base, IR::Expr *index, IR::Expr *target) override;
-    void setElement(IR::Expr *source, IR::Expr *targetBase, IR::Expr *targetIndex) override;
-    void copyValue(IR::Expr *source, IR::Expr *target) override;
-    void swapValues(IR::Expr *source, IR::Expr *target) override;
-    void unop(IR::AluOp oper, IR::Expr *sourceTemp, IR::Expr *target) override;
-    void binop(IR::AluOp oper, IR::Expr *leftSource, IR::Expr *rightSource, IR::Expr *target) override;
-
-    using Address = typename JITAssembler::Address;
-    using Pointer = typename JITAssembler::Pointer;
-    using PointerToValue = typename JITAssembler::PointerToValue;
-    using RegisterID = typename JITAssembler::RegisterID;
-    using FPRegisterID = typename JITAssembler::FPRegisterID;
-    using ResultCondition = typename JITAssembler::ResultCondition;
-    using TrustedImm32 = typename JITAssembler::TrustedImm32;
-    using TrustedImm64 = typename JITAssembler::TrustedImm64;
-    using Label = typename JITAssembler::Label;
-    using Jump = typename JITAssembler::Jump;
-    using StringToIndex = typename JITAssembler::StringToIndex;
-    using Reference = typename JITAssembler::Reference;
-    using RelationalCondition = typename JITAssembler::RelationalCondition;
-    using BranchTruncateType = typename JITAssembler::BranchTruncateType;
-    using RuntimeCall = typename JITAssembler::RuntimeCall;
-
-    using JITTargetPlatform = typename JITAssembler::JITTargetPlatform;
-
-    Address addressForArgument(int index) const
-    {
-        // FramePointerRegister points to its old value on the stack, and above
-        // it we have the return address, hence the need to step over two
-        // values before reaching the first argument.
-        return Address(JITTargetPlatform::FramePointerRegister, (index + 2) * JITTargetPlatform::RegisterSize);
-    }
-
-    Pointer baseAddressForCallArguments()
-    {
-        return _as->stackLayout().argumentAddressForCall(0);
-    }
-
-    Pointer baseAddressForCallData()
-    {
-        return _as->stackLayout().callDataAddress();
-    }
-
-    void constructActivationProperty(IR::Name *func, IR::ExprList *args, IR::Expr *result) override;
-    void constructProperty(IR::Expr *base, const QString &name, IR::ExprList *args, IR::Expr*result) override;
-    void constructValue(IR::Expr *value, IR::ExprList *args, IR::Expr *result) override;
-
-    void visitJump(IR::Jump *) override;
-    void visitCJump(IR::CJump *) override;
-    void visitRet(IR::Ret *) override;
-
-    bool visitCJumpDouble(IR::AluOp op, IR::Expr *left, IR::Expr *right,
-                          IR::BasicBlock *iftrue, IR::BasicBlock *iffalse);
-    bool visitCJumpSInt32(IR::AluOp op, IR::Expr *left, IR::Expr *right,
-                          IR::BasicBlock *iftrue, IR::BasicBlock *iffalse);
-    void visitCJumpStrict(IR::Binop *binop, IR::BasicBlock *trueBlock, IR::BasicBlock *falseBlock);
-    bool visitCJumpStrictNull(IR::Binop *binop, IR::BasicBlock *trueBlock, IR::BasicBlock *falseBlock);
-    bool visitCJumpStrictUndefined(IR::Binop *binop, IR::BasicBlock *trueBlock, IR::BasicBlock *falseBlock);
-    bool visitCJumpStrictBool(IR::Binop *binop, IR::BasicBlock *trueBlock, IR::BasicBlock *falseBlock);
-    bool visitCJumpNullUndefined(IR::Type nullOrUndef, IR::Binop *binop,
-                                 IR::BasicBlock *trueBlock, IR::BasicBlock *falseBlock);
-    void visitCJumpEqual(IR::Binop *binop, IR::BasicBlock *trueBlock, IR::BasicBlock *falseBlock);
-
-private:
-    void convertTypeSlowPath(IR::Expr *source, IR::Expr *target);
-    void convertTypeToDouble(IR::Expr *source, IR::Expr *target);
-    void convertTypeToBool(IR::Expr *source, IR::Expr *target);
-    void convertTypeToSInt32(IR::Expr *source, IR::Expr *target);
-    void convertTypeToUInt32(IR::Expr *source, IR::Expr *target);
-
-    void convertIntToDouble(IR::Expr *source, IR::Expr *target)
-    {
-        if (IR::Temp *targetTemp = target->asTemp()) {
-            if (targetTemp->kind == IR::Temp::PhysicalRegister) {
-                if (IR::Temp *sourceTemp = source->asTemp()) {
-                    if (sourceTemp->kind == IR::Temp::PhysicalRegister) {
-                        _as->convertInt32ToDouble((RegisterID) sourceTemp->index,
-                                                  (FPRegisterID) targetTemp->index);
-                    } else {
-                        _as->convertInt32ToDouble(_as->loadAddressForReading(JITTargetPlatform::ReturnValueRegister, sourceTemp),
-                                                  (FPRegisterID) targetTemp->index);
-                    }
-                } else {
-                    _as->convertInt32ToDouble(_as->toInt32Register(source, JITTargetPlatform::ScratchRegister),
-                                              (FPRegisterID) targetTemp->index);
-                }
-
-                return;
-            }
-        }
-
-        _as->convertInt32ToDouble(_as->toInt32Register(source, JITTargetPlatform::ScratchRegister),
-                                  JITTargetPlatform::FPGpr0);
-        _as->storeDouble(JITTargetPlatform::FPGpr0, target);
-    }
-
-    void convertUIntToDouble(IR::Expr *source, IR::Expr *target)
-    {
-        RegisterID tmpReg = JITTargetPlatform::ScratchRegister;
-        RegisterID reg = _as->toInt32Register(source, tmpReg);
-
-        if (IR::Temp *targetTemp = target->asTemp()) {
-            if (targetTemp->kind == IR::Temp::PhysicalRegister) {
-                _as->convertUInt32ToDouble(reg, (FPRegisterID) targetTemp->index, tmpReg);
-                return;
-            }
-        }
-
-        _as->convertUInt32ToDouble(_as->toUInt32Register(source, tmpReg),
-                                   JITTargetPlatform::FPGpr0, tmpReg);
-        _as->storeDouble(JITTargetPlatform::FPGpr0, target);
-    }
-
-    void convertIntToBool(IR::Expr *source, IR::Expr *target)
-    {
-        RegisterID reg = JITTargetPlatform::ScratchRegister;
-
-        if (IR::Temp *targetTemp = target->asTemp())
-            if (targetTemp->kind == IR::Temp::PhysicalRegister)
-                reg = (RegisterID) targetTemp->index;
-        _as->move(_as->toInt32Register(source, reg), reg);
-        _as->compare32(RelationalCondition::NotEqual, reg, TrustedImm32(0), reg);
-        _as->storeBool(reg, target);
-    }
-
-    int prepareVariableArguments(IR::ExprList* args);
-    int prepareCallData(IR::ExprList* args, IR::Expr *thisObject);
-
-    void calculateRegistersToSave(const RegisterInformation &used);
-
-    template <typename Retval, typename Arg1, typename Arg2, typename Arg3, typename Arg4>
-    void generateLookupCall(Retval retval, uint index, uint getterSetterOffset, Arg1 arg1, Arg2 arg2, Arg3 arg3, Arg4 arg4)
-    {
-        // Note: using the return value register is intentional: for ABIs where the first parameter
-        // goes into the same register as the return value (currently only ARM), the prepareCall
-        // will combine loading the looupAddr into the register and calculating the indirect call
-        // address.
-        Pointer lookupAddr(JITTargetPlatform::ReturnValueRegister, index * sizeof(QV4::Lookup));
-
-         _as->generateFunctionCallImp(true, retval, "lookup getter/setter",
-                                      typename JITAssembler::LookupCall(lookupAddr, getterSetterOffset), lookupAddr,
-                                      arg1, arg2, arg3, arg4);
-    }
-
-    template <typename Retval, typename Arg1, typename Arg2>
-    void generateLookupCall(Retval retval, uint index, uint getterSetterOffset, Arg1 arg1, Arg2 arg2)
-    {
-        generateLookupCall(retval, index, getterSetterOffset, arg1, arg2, typename JITAssembler::VoidType());
-    }
-
-    template <typename Retval, typename Arg1, typename Arg2, typename Arg3>
-    void generateLookupCall(Retval retval, uint index, uint getterSetterOffset, Arg1 arg1, Arg2 arg2, Arg3 arg3)
-    {
-        generateLookupCall(retval, index, getterSetterOffset, arg1, arg2, arg3, typename JITAssembler::VoidType());
-    }
-
-    IR::BasicBlock *_block;
-    BitVector _removableJumps;
-    JITAssembler* _as;
-
-    QScopedPointer<CompilationUnit> compilationUnit;
-    QQmlEnginePrivate *qmlEngine;
-    RegisterInformation regularRegistersToSave;
-    RegisterInformation fpRegistersToSave;
-};
-
-template <typename JITAssembler = Assembler<DefaultAssemblerTargetConfiguration>>
-class Q_QML_EXPORT ISelFactory: public EvalISelFactory
-{
-public:
-    ISelFactory() : EvalISelFactory(QStringLiteral("jit")) {}
-    virtual ~ISelFactory() {}
-    EvalInstructionSelection *create(QQmlEnginePrivate *qmlEngine, QV4::ExecutableAllocator *execAllocator, IR::Module *module, QV4::Compiler::JSUnitGenerator *jsGenerator) override final
-    { return new InstructionSelection<JITAssembler>(qmlEngine, execAllocator, module, jsGenerator, this); }
-    bool jitCompileRegexps() const override final
-    { return true; }
-    QQmlRefPointer<CompiledData::CompilationUnit> createUnitForLoading() override final;
-};
-
-} // end of namespace JIT
-} // end of namespace QV4
-
-QT_END_NAMESPACE
-
-#endif // ENABLE(ASSEMBLER)
-
-#endif // QV4ISEL_MASM_P_H
diff --git a/src/qml/jit/qv4jit.cpp b/src/qml/jit/qv4jit.cpp
new file mode 100644
index 0000000000..a8bdd20fbd
--- /dev/null
+++ b/src/qml/jit/qv4jit.cpp
@@ -0,0 +1,1365 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qv4jit_p.h"
+#include "qv4assembler_p.h"
+#include <private/qv4lookup_p.h>
+
+#ifdef V4_ENABLE_JIT
+
+QT_USE_NAMESPACE
+using namespace QV4;
+using namespace QV4::JIT;
+using namespace QV4::Moth;
+
+ByteCodeHandler::~ByteCodeHandler()
+{
+}
+
+#define DISPATCH_INSTRUCTION(name, nargs, ...) \
+    generate_##name( \
+        __VA_ARGS__ \
+    );
+
+#define DECODE_AND_DISPATCH(instr) \
+    { \
+        INSTR_##instr(MOTH_DECODE_WITH_BASE) \
+        Q_UNUSED(base_ptr); \
+        startInstruction(Instr::Type::instr); \
+        _offset = code - start; \
+        INSTR_##instr(DISPATCH) \
+        endInstruction(Instr::Type::instr); \
+        continue; \
+    }
+
+void ByteCodeHandler::decode(const char *code, uint len)
+{
+    MOTH_JUMP_TABLE;
+
+    const char *start = code;
+    const char *end = code + len;
+    while (code < end) {
+        MOTH_DISPATCH()
+
+        FOR_EACH_MOTH_INSTR(DECODE_AND_DISPATCH)
+    }
+}
+
+#undef DECODE_AND_DISPATCH
+#undef DISPATCH_INSTRUCTION
+
+BaselineJIT::BaselineJIT(Function *function)
+    : function(function)
+    , as(new Assembler(function->compilationUnit->constants))
+{}
+
+BaselineJIT::~BaselineJIT()
+{}
+
+void BaselineJIT::generate()
+{
+//    qDebug()<<"jitting" << function->name()->toQString();
+    collectLabelsInBytecode();
+
+    as->generatePrologue();
+    decode(reinterpret_cast<const char *>(function->codeData), function->compiledFunction->codeSize);
+    as->generateEpilogue();
+
+    as->link(function);
+//    qDebug()<<"done";
+}
+
+#define STORE_IP() as->storeInstructionPointer(instructionOffset())
+#define STORE_ACC() as->saveAccumulatorInFrame()
+
+void BaselineJIT::generate_Ret()
+{
+    as->ret();
+}
+
+void BaselineJIT::generate_Debug() { Q_UNREACHABLE(); }
+
+void BaselineJIT::generate_LoadConst(int index)
+{
+    as->loadConst(index);
+}
+
+void BaselineJIT::generate_LoadZero()
+{
+    as->loadValue(Encode(int(0)));
+}
+
+void BaselineJIT::generate_LoadTrue()
+{
+    as->loadValue(Encode(true));
+}
+
+void BaselineJIT::generate_LoadFalse()
+{
+    as->loadValue(Encode(false));
+}
+
+void BaselineJIT::generate_LoadNull()
+{
+    as->loadValue(Encode::null());
+}
+
+void BaselineJIT::generate_LoadUndefined()
+{
+    as->loadValue(Encode::undefined());
+}
+
+void BaselineJIT::generate_LoadInt(int value)
+{
+    //###
+    as->loadValue(Encode(value));
+}
+
+void BaselineJIT::generate_MoveConst(int constIndex, int destTemp)
+{
+    as->copyConst(constIndex, destTemp);
+}
+
+void BaselineJIT::generate_LoadReg(int reg)
+{
+    as->loadReg(reg);
+}
+
+void BaselineJIT::generate_StoreReg(int reg)
+{
+    as->storeReg(reg);
+}
+
+void BaselineJIT::generate_MoveReg(int srcReg, int destReg)
+{
+    as->loadReg(srcReg);
+    as->storeReg(destReg);
+}
+
+static ReturnedValue loadLocalHelper(const Value &context, int index)
+{
+    auto cc = static_cast<Heap::CallContext *>(context.m());
+    return cc->locals[uint(index)].asReturnedValue();
+}
+
+void BaselineJIT::generate_LoadLocal(int index)
+{
+    as->prepareCallWithArgCount(2);
+    as->passInt32AsArg(index, 1);
+    as->passRegAsArg(CallData::Context, 0);
+    JIT_GENERATE_RUNTIME_CALL(loadLocalHelper, Assembler::ResultInAccumulator);
+}
+
+static void storeLocalHelper(ExecutionEngine *engine, const Value &context, int index, const Value &acc)
+{
+    auto cc = static_cast<Heap::CallContext *>(context.m());
+    QV4::WriteBarrier::write(engine, cc, cc->locals.values + index, acc);
+}
+
+void BaselineJIT::generate_StoreLocal(int index)
+{
+    as->checkException();
+    as->prepareCallWithArgCount(4);
+    STORE_ACC();
+    as->passAccumulatorAsArg(3);
+    as->passInt32AsArg(index, 2);
+    as->passRegAsArg(CallData::Context, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(storeLocalHelper, Assembler::IgnoreResult);
+}
+
+static inline Heap::CallContext *getScope(Value *stack, int level)
+{
+    Heap::ExecutionContext *scope = static_cast<ExecutionContext &>(stack[CallData::Context]).d();
+    while (level > 0) {
+        --level;
+        scope = scope->outer;
+    }
+    Q_ASSERT(scope);
+    return static_cast<Heap::CallContext *>(scope);
+}
+
+static ReturnedValue loadScopedLocalHelper(Value *stack, int scope, int index)
+{
+    auto cc = getScope(stack, scope);
+    return cc->locals[uint(index)].asReturnedValue();
+}
+
+void BaselineJIT::generate_LoadScopedLocal(int scope, int index)
+{
+    as->prepareCallWithArgCount(3);
+    as->passInt32AsArg(index, 2);
+    as->passInt32AsArg(scope, 1);
+    as->passRegAsArg(0, 0);
+    JIT_GENERATE_RUNTIME_CALL(loadScopedLocalHelper, Assembler::ResultInAccumulator);
+}
+
+static void storeScopedLocalHelper(ExecutionEngine *engine, Value *stack, int scope, int index,
+                                   const Value &acc)
+{
+    auto cc = getScope(stack, scope);
+    QV4::WriteBarrier::write(engine, cc, cc->locals.values + index, acc);
+}
+
+void BaselineJIT::generate_StoreScopedLocal(int scope, int index)
+{
+    as->checkException();
+    as->prepareCallWithArgCount(5);
+    STORE_ACC();
+    as->passAccumulatorAsArg(4);
+    as->passInt32AsArg(index, 3);
+    as->passInt32AsArg(scope, 2);
+    as->passRegAsArg(0, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(storeScopedLocalHelper, Assembler::IgnoreResult);
+}
+
+void BaselineJIT::generate_LoadRuntimeString(int stringId)
+{
+    as->loadString(stringId);
+}
+
+void BaselineJIT::generate_LoadRegExp(int regExpId)
+{
+    as->prepareCallWithArgCount(2);
+    as->passInt32AsArg(regExpId, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_regexpLiteral, Assembler::ResultInAccumulator);
+}
+
+void BaselineJIT::generate_LoadClosure(int value)
+{
+    as->prepareCallWithArgCount(2);
+    as->passInt32AsArg(value, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_closure, Assembler::ResultInAccumulator);
+}
+
+void BaselineJIT::generate_LoadName(int name)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(2);
+    as->passInt32AsArg(name, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_loadName, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+static ReturnedValue loadGlobalLookupHelper(ExecutionEngine *engine, QV4::Function *f, int index)
+{
+    QV4::Lookup *l = f->compilationUnit->runtimeLookups + index;
+    return l->globalGetter(l, engine);
+}
+
+void BaselineJIT::generate_LoadGlobalLookup(int index)
+{
+    as->prepareCallWithArgCount(3);
+    as->passInt32AsArg(index, 2);
+    as->passFunctionAsArg(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(loadGlobalLookupHelper, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_StoreNameSloppy(int name)
+{
+    STORE_IP();
+    STORE_ACC();
+    as->prepareCallWithArgCount(3);
+    as->passAccumulatorAsArg(2);
+    as->passInt32AsArg(name, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_storeNameSloppy, Assembler::IgnoreResult);
+    as->checkException();
+}
+
+void BaselineJIT::generate_StoreNameStrict(int name)
+{
+    STORE_IP();
+    STORE_ACC();
+    as->prepareCallWithArgCount(3);
+    as->passAccumulatorAsArg(2);
+    as->passInt32AsArg(name, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_storeNameStrict, Assembler::IgnoreResult);
+    as->checkException();
+}
+
+void BaselineJIT::generate_LoadElement(int base, int index)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(3);
+    as->passRegAsArg(index, 2);
+    as->passRegAsArg(base, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_loadElement, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_LoadElementA(int base)
+{
+    STORE_IP();
+    STORE_ACC();
+    as->prepareCallWithArgCount(3);
+    as->passAccumulatorAsArg(2);
+    as->passRegAsArg(base, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_loadElement, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+static void storeElementHelper(QV4::Function *f, const Value &base, const Value &index, const Value &value)
+{
+    auto engine = f->internalClass->engine;
+    if (!Runtime::method_storeElement(engine, base, index, value) && f->isStrict())
+        engine->throwTypeError();
+}
+
+void BaselineJIT::generate_StoreElement(int base, int index)
+{
+    STORE_IP();
+    STORE_ACC();
+    as->prepareCallWithArgCount(4);
+    as->passAccumulatorAsArg(3);
+    as->passRegAsArg(index, 2);
+    as->passRegAsArg(base, 1);
+    as->passFunctionAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(storeElementHelper, Assembler::IgnoreResult);
+    as->checkException();
+}
+
+void BaselineJIT::generate_LoadProperty(int name, int base)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(3);
+    as->passInt32AsArg(name, 2);
+    as->passRegAsArg(base, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_loadProperty, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+void BaselineJIT::generate_LoadPropertyA(int name)
+{
+    STORE_IP();
+    STORE_ACC();
+    as->prepareCallWithArgCount(3);
+    as->passInt32AsArg(name, 2);
+    as->passAccumulatorAsArg(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_loadProperty, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+static ReturnedValue getLookupHelper(ExecutionEngine *engine, QV4::Function *f, int index, const QV4::Value &base)
+{
+    QV4::Lookup *l = f->compilationUnit->runtimeLookups + index;
+    return l->getter(l, engine, base);
+}
+
+void BaselineJIT::generate_GetLookup(int index, int base)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(4);
+    as->passRegAsArg(base, 3);
+    as->passInt32AsArg(index, 2);
+    as->passFunctionAsArg(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(getLookupHelper, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_GetLookupA(int index)
+{
+    STORE_IP();
+    STORE_ACC();
+    as->prepareCallWithArgCount(4);
+    as->passAccumulatorAsArg(3);
+    as->passInt32AsArg(index, 2);
+    as->passFunctionAsArg(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(getLookupHelper, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+static void storePropertyHelper(QV4::Function *f, const Value &base, int name, const Value &value)
+{
+    auto engine = f->internalClass->engine;
+    if (!Runtime::method_storeProperty(engine, base, name, value) && f->isStrict())
+        engine->throwTypeError();
+}
+
+void BaselineJIT::generate_StoreProperty(int name, int base)
+{
+    STORE_IP();
+    STORE_ACC();
+    as->prepareCallWithArgCount(4);
+    as->passAccumulatorAsArg(3);
+    as->passInt32AsArg(name, 2);
+    as->passRegAsArg(base, 1);
+    as->passFunctionAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(storePropertyHelper, Assembler::IgnoreResult);
+    as->checkException();
+}
+
+static void setLookupHelper(QV4::Function *f, int index, QV4::Value &base, const QV4::Value &value)
+{
+    ExecutionEngine *engine = f->internalClass->engine;
+    QV4::Lookup *l = f->compilationUnit->runtimeLookups + index;
+    if (!l->setter(l, engine, base, value) && f->isStrict())
+        engine->throwTypeError();
+}
+
+void BaselineJIT::generate_SetLookup(int index, int base)
+{
+    STORE_IP();
+    STORE_ACC();
+    as->prepareCallWithArgCount(4);
+    as->passAccumulatorAsArg(3);
+    as->passRegAsArg(base, 2);
+    as->passInt32AsArg(index, 1);
+    as->passFunctionAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(setLookupHelper, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_StoreScopeObjectProperty(int base, int propertyIndex)
+{
+    STORE_ACC();
+    as->prepareCallWithArgCount(4);
+    as->passAccumulatorAsArg(3);
+    as->passInt32AsArg(propertyIndex, 2);
+    as->passRegAsArg(base, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_storeQmlScopeObjectProperty, Assembler::IgnoreResult);
+    as->checkException();
+}
+
+void BaselineJIT::generate_StoreContextObjectProperty(int base, int propertyIndex)
+{
+    STORE_ACC();
+    as->prepareCallWithArgCount(4);
+    as->passAccumulatorAsArg(3);
+    as->passInt32AsArg(propertyIndex, 2);
+    as->passRegAsArg(base, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_storeQmlContextObjectProperty, Assembler::IgnoreResult);
+    as->checkException();
+}
+
+void BaselineJIT::generate_LoadScopeObjectProperty(int propertyIndex, int base, int captureRequired)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(4);
+    as->passInt32AsArg(captureRequired, 3);
+    as->passInt32AsArg(propertyIndex, 2);
+    as->passRegAsArg(base, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_loadQmlScopeObjectProperty, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_LoadContextObjectProperty(int propertyIndex, int base, int captureRequired)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(4);
+    as->passInt32AsArg(captureRequired, 3);
+    as->passInt32AsArg(propertyIndex, 2);
+    as->passRegAsArg(base, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_loadQmlContextObjectProperty, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_LoadIdObject(int index, int base)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(3);
+    as->passInt32AsArg(index, 2);
+    as->passRegAsArg(base, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_loadQmlIdObject, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_CallValue(int argc, int argv)
+{
+    STORE_IP();
+    STORE_ACC();
+    as->prepareCallWithArgCount(4);
+    as->passInt32AsArg(argc, 3);
+    as->passRegAsArg(argv, 2);
+    as->passAccumulatorAsArg(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_callValue, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_CallProperty(int name, int base, int argc, int argv)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(5);
+    as->passInt32AsArg(argc, 4);
+    as->passRegAsArg(argv, 3);
+    as->passInt32AsArg(name, 2);
+    as->passRegAsArg(base, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_callProperty, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_CallPropertyLookup(int lookupIndex, int base, int argc, int argv)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(5);
+    as->passInt32AsArg(argc, 4);
+    as->passRegAsArg(argv, 3);
+    as->passInt32AsArg(lookupIndex, 2);
+    as->passRegAsArg(base, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_callPropertyLookup, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_CallElement(int base, int index, int argc, int argv)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(5);
+    as->passInt32AsArg(argc, 4);
+    as->passRegAsArg(argv, 3);
+    as->passRegAsArg(index, 2);
+    as->passRegAsArg(base, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_callElement, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_CallName(int name, int argc, int argv)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(4);
+    as->passInt32AsArg(argc, 3);
+    as->passRegAsArg(argv, 2);
+    as->passInt32AsArg(name, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_callName, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_CallPossiblyDirectEval(int argc, int argv)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(3);
+    as->passInt32AsArg(argc, 2);
+    as->passRegAsArg(argv, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_callPossiblyDirectEval, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_CallGlobalLookup(int index, int argc, int argv)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(4);
+    as->passInt32AsArg(argc, 3);
+    as->passRegAsArg(argv, 2);
+    as->passInt32AsArg(index, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_callGlobalLookup, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_SetExceptionHandler(int offset)
+{
+    if (offset)
+        as->setExceptionHandler(instructionOffset() + offset);
+    else
+        as->clearExceptionHandler();
+}
+
+void BaselineJIT::generate_ThrowException()
+{
+    STORE_IP();
+    STORE_ACC();
+    as->prepareCallWithArgCount(2);
+    as->passAccumulatorAsArg(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_throwException, Assembler::IgnoreResult);
+    as->gotoCatchException();
+}
+
+void BaselineJIT::generate_GetException() { as->getException(); }
+void BaselineJIT::generate_SetException() { as->setException(); }
+
+static void createCallContextHelper(Value *stack, CppStackFrame *frame)
+{
+    stack[CallData::Context] = ExecutionContext::newCallContext(frame);
+}
+
+void BaselineJIT::generate_CreateCallContext()
+{
+    as->prepareCallWithArgCount(2);
+    as->passCppFrameAsArg(1);
+    as->passRegAsArg(0, 0);
+    JIT_GENERATE_RUNTIME_CALL(createCallContextHelper, Assembler::IgnoreResult);
+}
+
+void BaselineJIT::generate_PushCatchContext(int name, int reg) { as->pushCatchContext(name, reg); }
+
+static void pushWithContextHelper(ExecutionEngine *engine, QV4::Value *stack, int reg)
+{
+    QV4::Value &accumulator = stack[CallData::Accumulator];
+    accumulator = accumulator.toObject(engine);
+    if (engine->hasException)
+        return;
+    stack[reg] = stack[CallData::Context];
+    ExecutionContext *c = static_cast<ExecutionContext *>(stack + CallData::Context);
+    stack[CallData::Context] = Runtime::method_createWithContext(c, accumulator);
+}
+
+void BaselineJIT::generate_PushWithContext(int reg)
+{
+    STORE_IP();
+    as->saveAccumulatorInFrame();
+    as->prepareCallWithArgCount(3);
+    as->passInt32AsArg(reg, 2);
+    as->passRegAsArg(0, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(pushWithContextHelper, Assembler::IgnoreResult);
+    as->checkException();
+}
+
+void BaselineJIT::generate_PopContext(int reg) { as->popContext(reg); }
+
+void BaselineJIT::generate_ForeachIteratorObject()
+{
+    as->saveAccumulatorInFrame();
+    as->prepareCallWithArgCount(2);
+    as->passAccumulatorAsArg(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_foreachIterator, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_ForeachNextPropertyName()
+{
+    as->saveAccumulatorInFrame();
+    as->prepareCallWithArgCount(1);
+    as->passAccumulatorAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_foreachNextPropertyName,
+                              Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+static ReturnedValue deleteMemberHelper(QV4::Function *function, const QV4::Value &base, int member)
+{
+    auto engine = function->internalClass->engine;
+    if (!Runtime::method_deleteMember(engine, base, member)) {
+        if (function->isStrict())
+            engine->throwTypeError();
+        return Encode(false);
+    } else {
+        return Encode(true);
+    }
+}
+
+void BaselineJIT::generate_DeleteMember(int member, int base)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(3);
+    as->passInt32AsArg(member, 2);
+    as->passRegAsArg(base, 1);
+    as->passFunctionAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(deleteMemberHelper, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+static ReturnedValue deleteSubscriptHelper(QV4::Function *function, const QV4::Value &base, const QV4::Value &index)
+{
+    auto engine = function->internalClass->engine;
+    if (!Runtime::method_deleteElement(engine, base, index)) {
+        if (function->isStrict())
+            engine->throwTypeError();
+        return Encode(false);
+    } else {
+        return Encode(true);
+    }
+}
+
+void BaselineJIT::generate_DeleteSubscript(int base, int index)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(3);
+    as->passRegAsArg(index, 2);
+    as->passRegAsArg(base, 1);
+    as->passFunctionAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(deleteSubscriptHelper, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+static ReturnedValue deleteNameHelper(QV4::Function *function, int name)
+{
+    auto engine = function->internalClass->engine;
+    if (!Runtime::method_deleteName(engine, name)) {
+        if (function->isStrict())
+            engine->throwTypeError();
+        return Encode(false);
+    } else {
+        return Encode(true);
+    }
+}
+
+void BaselineJIT::generate_DeleteName(int name)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(2);
+    as->passInt32AsArg(name, 1);
+    as->passFunctionAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(deleteNameHelper, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_TypeofName(int name)
+{
+    as->prepareCallWithArgCount(2);
+    as->passInt32AsArg(name, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_typeofName, Assembler::ResultInAccumulator);
+}
+
+void BaselineJIT::generate_TypeofValue()
+{
+    STORE_ACC();
+    as->prepareCallWithArgCount(2);
+    as->passAccumulatorAsArg(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_typeofValue, Assembler::ResultInAccumulator);
+}
+
+void BaselineJIT::generate_DeclareVar(int varName, int isDeletable)
+{
+    as->prepareCallWithArgCount(3);
+    as->passInt32AsArg(varName, 2);
+    as->passInt32AsArg(isDeletable, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_declareVar, Assembler::IgnoreResult);
+}
+
+void BaselineJIT::generate_DefineArray(int argc, int args)
+{
+    as->prepareCallWithArgCount(3);
+    as->passInt32AsArg(argc, 2);
+    as->passRegAsArg(args, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_arrayLiteral, Assembler::ResultInAccumulator);
+}
+
+void BaselineJIT::generate_DefineObjectLiteral(int internalClassId, int arrayValueCount,
+                                             int arrayGetterSetterCountAndFlags, int args)
+{
+    as->prepareCallWithArgCount(5);
+    as->passInt32AsArg(arrayGetterSetterCountAndFlags, 4);
+    as->passInt32AsArg(arrayValueCount, 3);
+    as->passInt32AsArg(internalClassId, 2);
+    as->passRegAsArg(args, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_objectLiteral, Assembler::ResultInAccumulator);
+}
+void BaselineJIT::generate_CreateMappedArgumentsObject()
+{
+    as->prepareCallWithArgCount(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_createMappedArgumentsObject,
+                              Assembler::ResultInAccumulator);
+}
+
+void BaselineJIT::generate_CreateUnmappedArgumentsObject()
+{
+    as->prepareCallWithArgCount(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_createUnmappedArgumentsObject,
+                              Assembler::ResultInAccumulator);
+}
+
+static void convertThisToObjectHelper(ExecutionEngine *engine, Value *t)
+{
+    if (!t->isObject()) {
+        if (t->isNullOrUndefined()) {
+            *t = engine->globalObject->asReturnedValue();
+        } else {
+            *t = t->toObject(engine)->asReturnedValue();
+        }
+    }
+}
+
+void BaselineJIT::generate_ConvertThisToObject()
+{
+    as->prepareCallWithArgCount(2);
+    as->passRegAsArg(CallData::This, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(convertThisToObjectHelper, Assembler::IgnoreResult);
+    as->checkException();
+}
+
+void BaselineJIT::generate_Construct(int func, int argc, int argv)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(4);
+    as->passInt32AsArg(argc, 3);
+    as->passRegAsArg(argv, 2);
+    as->passRegAsArg(func, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_construct, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_Jump(int offset) { as->jump(instructionOffset() + offset); }
+void BaselineJIT::generate_JumpTrue(int offset) { as->jumpTrue(instructionOffset() + offset); }
+void BaselineJIT::generate_JumpFalse(int offset) { as->jumpFalse(instructionOffset() + offset); }
+
+void BaselineJIT::generate_CmpEqNull() { as->cmpeqNull(); }
+void BaselineJIT::generate_CmpNeNull() { as->cmpneNull(); }
+void BaselineJIT::generate_CmpEqInt(int lhs) { as->cmpeqInt(lhs); }
+void BaselineJIT::generate_CmpNeInt(int lhs) { as->cmpneInt(lhs); }
+void BaselineJIT::generate_CmpEq(int lhs) { as->cmpeq(lhs); }
+void BaselineJIT::generate_CmpNe(int lhs) { as->cmpne(lhs); }
+void BaselineJIT::generate_CmpGt(int lhs) { as->cmpgt(lhs); }
+void BaselineJIT::generate_CmpGe(int lhs) { as->cmpge(lhs); }
+void BaselineJIT::generate_CmpLt(int lhs) { as->cmplt(lhs); }
+void BaselineJIT::generate_CmpLe(int lhs) { as->cmple(lhs); }
+void BaselineJIT::generate_CmpStrictEqual(int lhs) { as->cmpStrictEqual(lhs); }
+void BaselineJIT::generate_CmpStrictNotEqual(int lhs) { as->cmpStrictNotEqual(lhs); }
+
+void BaselineJIT::generate_CmpIn(int lhs)
+{
+    STORE_ACC();
+    as->prepareCallWithArgCount(3);
+    as->passAccumulatorAsArg(2);
+    as->passRegAsArg(lhs, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_in, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_CmpInstanceOf(int lhs)
+{
+    STORE_ACC();
+    as->prepareCallWithArgCount(3);
+    as->passAccumulatorAsArg(2);
+    as->passRegAsArg(lhs, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_instanceof, Assembler::ResultInAccumulator);
+    as->checkException();
+}
+
+void BaselineJIT::generate_JumpStrictEqualStackSlotInt(int lhs, int rhs, int offset)
+{
+    as->jumpStrictEqualStackSlotInt(lhs, rhs, instructionOffset() + offset);
+}
+
+void BaselineJIT::generate_JumpStrictNotEqualStackSlotInt(int lhs, int rhs, int offset)
+{
+    as->jumpStrictNotEqualStackSlotInt(lhs, rhs, instructionOffset() + offset);
+}
+
+void BaselineJIT::generate_UNot() { as->unot(); }
+void BaselineJIT::generate_UPlus() { as->toNumber(); }
+void BaselineJIT::generate_UMinus() { as->uminus(); }
+void BaselineJIT::generate_UCompl() { as->ucompl(); }
+void BaselineJIT::generate_Increment() { as->inc(); }
+void BaselineJIT::generate_Decrement() { as->dec(); }
+void BaselineJIT::generate_Add(int lhs) { as->add(lhs); }
+
+void BaselineJIT::generate_BitAnd(int lhs) { as->bitAnd(lhs); }
+void BaselineJIT::generate_BitOr(int lhs) { as->bitOr(lhs); }
+void BaselineJIT::generate_BitXor(int lhs) { as->bitXor(lhs); }
+void BaselineJIT::generate_UShr(int lhs) { as->ushr(lhs); }
+void BaselineJIT::generate_Shr(int lhs) { as->shr(lhs); }
+void BaselineJIT::generate_Shl(int lhs) { as->shl(lhs); }
+
+void BaselineJIT::generate_BitAndConst(int rhs) { as->bitAndConst(rhs); }
+void BaselineJIT::generate_BitOrConst(int rhs) { as->bitOrConst(rhs); }
+void BaselineJIT::generate_BitXorConst(int rhs) { as->bitXorConst(rhs); }
+void BaselineJIT::generate_UShrConst(int rhs) { as->ushrConst(rhs); }
+void BaselineJIT::generate_ShrConst(int rhs) { as->shrConst(rhs); }
+void BaselineJIT::generate_ShlConst(int rhs) { as->shlConst(rhs); }
+
+void BaselineJIT::generate_Mul(int lhs) { as->mul(lhs); }
+void BaselineJIT::generate_Div(int lhs) { as->div(lhs); }
+void BaselineJIT::generate_Mod(int lhs) { as->mod(lhs); }
+void BaselineJIT::generate_Sub(int lhs) { as->sub(lhs); }
+
+//void BaselineJIT::generate_BinopContext(int alu, int lhs)
+//{
+//    auto engine = function->internalClass->engine;
+//    void *op = engine->runtime.runtimeMethods[alu];
+//    STORE_ACC();
+//    as->passAccumulatorAsArg(2);
+//    as->passRegAsArg(lhs, 1);
+//    as->passEngineAsArg(0);
+//    as->callRuntime("binopContext", op, Assembler::ResultInAccumulator);
+//    as->checkException();
+//}
+
+void BaselineJIT::generate_LoadQmlContext(int result)
+{
+    as->prepareCallWithArgCount(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_loadQmlContext, Assembler::ResultInAccumulator);
+    as->storeReg(result);
+}
+
+void BaselineJIT::generate_LoadQmlImportedScripts(int result)
+{
+    as->prepareCallWithArgCount(1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_loadQmlImportedScripts, Assembler::ResultInAccumulator);
+    as->storeReg(result);
+}
+
+void BaselineJIT::generate_LoadQmlSingleton(int name)
+{
+    as->prepareCallWithArgCount(2);
+    as->passInt32AsArg(name, 1);
+    as->passEngineAsArg(0);
+    JIT_GENERATE_RUNTIME_CALL(Runtime::method_loadQmlSingleton, Assembler::ResultInAccumulator);
+}
+
+void BaselineJIT::startInstruction(Instr::Type /*instr*/)
+{
+    if (hasLabel())
+        as->addLabel(instructionOffset());
+}
+
+void BaselineJIT::endInstruction(Instr::Type instr)
+{
+    Q_UNUSED(instr);
+}
+
+#define MOTH_UNUSED_ARGS0()
+#define MOTH_UNUSED_ARGS1(arg) \
+    Q_UNUSED(arg);
+#define MOTH_UNUSED_ARGS2(arg1, arg2) \
+    Q_UNUSED(arg1); \
+    Q_UNUSED(arg2);
+#define MOTH_UNUSED_ARGS3(arg1, arg2, arg3) \
+    Q_UNUSED(arg1); \
+    Q_UNUSED(arg2); \
+    Q_UNUSED(arg3);
+#define MOTH_UNUSED_ARGS4(arg1, arg2, arg3, arg4) \
+    Q_UNUSED(arg1); \
+    Q_UNUSED(arg2); \
+    Q_UNUSED(arg3); \
+    Q_UNUSED(arg4);
+
+#define MOTH_MARK_ARGS_UNUSED_PLEASE(nargs, ...) \
+    MOTH_EXPAND_FOR_MSVC(MOTH_UNUSED_ARGS##nargs(__VA_ARGS__))
+
+#define MOTH_MARK_ARGS_UNUSED_INSTRUCTION(name, nargs, ...) \
+    MOTH_MARK_ARGS_UNUSED_PLEASE(nargs, __VA_ARGS__)
+
+#define MOTH_BEGIN_INSTR(instr) \
+    { \
+        INSTR_##instr(MOTH_DECODE_WITH_BASE) \
+        INSTR_##instr(MOTH_MARK_ARGS_UNUSED) \
+        Q_UNUSED(base_ptr);
+
+#define MOTH_END_INSTR(instr) \
+        continue; \
+    }
+
+void BaselineJIT::collectLabelsInBytecode()
+{
+    MOTH_JUMP_TABLE;
+
+    const char *code = reinterpret_cast<const char *>(function->codeData);
+    const char *start = code;
+    const char *end = code + function->compiledFunction->codeSize;
+    while (code < end) {
+        MOTH_DISPATCH()
+        Q_UNREACHABLE();
+
+        MOTH_BEGIN_INSTR(LoadReg)
+        MOTH_END_INSTR(LoadReg)
+
+        MOTH_BEGIN_INSTR(StoreReg)
+        MOTH_END_INSTR(StoreReg)
+
+        MOTH_BEGIN_INSTR(MoveReg)
+        MOTH_END_INSTR(MoveReg)
+
+        MOTH_BEGIN_INSTR(LoadConst)
+        MOTH_END_INSTR(LoadConst)
+
+        MOTH_BEGIN_INSTR(LoadNull)
+        MOTH_END_INSTR(LoadNull)
+
+        MOTH_BEGIN_INSTR(LoadZero)
+        MOTH_END_INSTR(LoadZero)
+
+        MOTH_BEGIN_INSTR(LoadTrue)
+        MOTH_END_INSTR(LoadTrue)
+
+        MOTH_BEGIN_INSTR(LoadFalse)
+        MOTH_END_INSTR(LoadFalse)
+
+        MOTH_BEGIN_INSTR(LoadUndefined)
+        MOTH_END_INSTR(LoadUndefined)
+
+        MOTH_BEGIN_INSTR(LoadInt)
+        MOTH_END_INSTR(LoadInt)
+
+        MOTH_BEGIN_INSTR(MoveConst)
+        MOTH_END_INSTR(MoveConst)
+
+        MOTH_BEGIN_INSTR(LoadLocal)
+        MOTH_END_INSTR(LoadLocal)
+
+        MOTH_BEGIN_INSTR(StoreLocal)
+        MOTH_END_INSTR(StoreLocal)
+
+        MOTH_BEGIN_INSTR(LoadScopedLocal)
+        MOTH_END_INSTR(LoadScopedLocal)
+
+        MOTH_BEGIN_INSTR(StoreScopedLocal)
+        MOTH_END_INSTR(StoreScopedLocal)
+
+        MOTH_BEGIN_INSTR(LoadRuntimeString)
+        MOTH_END_INSTR(LoadRuntimeString)
+
+        MOTH_BEGIN_INSTR(LoadRegExp)
+        MOTH_END_INSTR(LoadRegExp)
+
+        MOTH_BEGIN_INSTR(LoadClosure)
+        MOTH_END_INSTR(LoadClosure)
+
+        MOTH_BEGIN_INSTR(LoadName)
+        MOTH_END_INSTR(LoadName)
+
+        MOTH_BEGIN_INSTR(LoadGlobalLookup)
+        MOTH_END_INSTR(LoadGlobalLookup)
+
+        MOTH_BEGIN_INSTR(StoreNameSloppy)
+        MOTH_END_INSTR(StoreNameSloppy)
+
+        MOTH_BEGIN_INSTR(StoreNameStrict)
+        MOTH_END_INSTR(StoreNameStrict)
+
+        MOTH_BEGIN_INSTR(LoadElement)
+        MOTH_END_INSTR(LoadElement)
+
+        MOTH_BEGIN_INSTR(LoadElementA)
+        MOTH_END_INSTR(LoadElement)
+
+        MOTH_BEGIN_INSTR(StoreElement)
+        MOTH_END_INSTR(StoreElement)
+
+        MOTH_BEGIN_INSTR(LoadProperty)
+        MOTH_END_INSTR(LoadProperty)
+
+        MOTH_BEGIN_INSTR(LoadPropertyA)
+        MOTH_END_INSTR(LoadElementA)
+
+        MOTH_BEGIN_INSTR(GetLookup)
+        MOTH_END_INSTR(GetLookup)
+
+        MOTH_BEGIN_INSTR(GetLookupA)
+        MOTH_END_INSTR(GetLookupA)
+
+        MOTH_BEGIN_INSTR(StoreProperty)
+        MOTH_END_INSTR(StoreProperty)
+
+        MOTH_BEGIN_INSTR(SetLookup)
+        MOTH_END_INSTR(SetLookup)
+
+        MOTH_BEGIN_INSTR(StoreScopeObjectProperty)
+        MOTH_END_INSTR(StoreScopeObjectProperty)
+
+        MOTH_BEGIN_INSTR(LoadScopeObjectProperty)
+        MOTH_END_INSTR(LoadScopeObjectProperty)
+
+        MOTH_BEGIN_INSTR(StoreContextObjectProperty)
+        MOTH_END_INSTR(StoreContextObjectProperty)
+
+        MOTH_BEGIN_INSTR(LoadContextObjectProperty)
+        MOTH_END_INSTR(LoadContextObjectProperty)
+
+        MOTH_BEGIN_INSTR(LoadIdObject)
+        MOTH_END_INSTR(LoadIdObject)
+
+        MOTH_BEGIN_INSTR(CallValue)
+        MOTH_END_INSTR(CallValue)
+
+        MOTH_BEGIN_INSTR(CallProperty)
+        MOTH_END_INSTR(CallProperty)
+
+        MOTH_BEGIN_INSTR(CallPropertyLookup)
+        MOTH_END_INSTR(CallPropertyLookup)
+
+        MOTH_BEGIN_INSTR(CallElement)
+        MOTH_END_INSTR(CallElement)
+
+        MOTH_BEGIN_INSTR(CallName)
+        MOTH_END_INSTR(CallName)
+
+        MOTH_BEGIN_INSTR(CallPossiblyDirectEval)
+        MOTH_END_INSTR(CallPossiblyDirectEval)
+
+        MOTH_BEGIN_INSTR(CallGlobalLookup)
+        MOTH_END_INSTR(CallGlobalLookup)
+
+        MOTH_BEGIN_INSTR(SetExceptionHandler)
+            labels.push_back(code - start + offset);
+        MOTH_END_INSTR(SetExceptionHandler)
+
+        MOTH_BEGIN_INSTR(ThrowException)
+        MOTH_END_INSTR(ThrowException)
+
+        MOTH_BEGIN_INSTR(GetException)
+        MOTH_END_INSTR(HasException)
+
+        MOTH_BEGIN_INSTR(SetException)
+        MOTH_END_INSTR(SetExceptionFlag)
+
+        MOTH_BEGIN_INSTR(CreateCallContext)
+        MOTH_END_INSTR(CreateCallContext)
+
+        MOTH_BEGIN_INSTR(PushCatchContext)
+        MOTH_END_INSTR(PushCatchContext)
+
+        MOTH_BEGIN_INSTR(PushWithContext)
+        MOTH_END_INSTR(PushWithContext)
+
+        MOTH_BEGIN_INSTR(PopContext)
+        MOTH_END_INSTR(PopContext)
+
+        MOTH_BEGIN_INSTR(ForeachIteratorObject)
+        MOTH_END_INSTR(ForeachIteratorObject)
+
+        MOTH_BEGIN_INSTR(ForeachNextPropertyName)
+        MOTH_END_INSTR(ForeachNextPropertyName)
+
+        MOTH_BEGIN_INSTR(DeleteMember)
+        MOTH_END_INSTR(DeleteMember)
+
+        MOTH_BEGIN_INSTR(DeleteSubscript)
+        MOTH_END_INSTR(DeleteSubscript)
+
+        MOTH_BEGIN_INSTR(DeleteName)
+        MOTH_END_INSTR(DeleteName)
+
+        MOTH_BEGIN_INSTR(TypeofName)
+        MOTH_END_INSTR(TypeofName)
+
+        MOTH_BEGIN_INSTR(TypeofValue)
+        MOTH_END_INSTR(TypeofValue)
+
+        MOTH_BEGIN_INSTR(DeclareVar)
+        MOTH_END_INSTR(DeclareVar)
+
+        MOTH_BEGIN_INSTR(DefineArray)
+        MOTH_END_INSTR(DefineArray)
+
+        MOTH_BEGIN_INSTR(DefineObjectLiteral)
+        MOTH_END_INSTR(DefineObjectLiteral)
+
+        MOTH_BEGIN_INSTR(CreateMappedArgumentsObject)
+        MOTH_END_INSTR(CreateMappedArgumentsObject)
+
+        MOTH_BEGIN_INSTR(CreateUnmappedArgumentsObject)
+        MOTH_END_INSTR(CreateUnmappedArgumentsObject)
+
+        MOTH_BEGIN_INSTR(ConvertThisToObject)
+        MOTH_END_INSTR(ConvertThisToObject)
+
+        MOTH_BEGIN_INSTR(Construct)
+        MOTH_END_INSTR(Construct)
+
+        MOTH_BEGIN_INSTR(Jump)
+            labels.push_back(code - start + offset);
+        MOTH_END_INSTR(Jump)
+
+        MOTH_BEGIN_INSTR(JumpTrue)
+            labels.push_back(code - start + offset);
+        MOTH_END_INSTR(JumpTrue)
+
+        MOTH_BEGIN_INSTR(JumpFalse)
+            labels.push_back(code - start + offset);
+        MOTH_END_INSTR(JumpFalse)
+
+        MOTH_BEGIN_INSTR(CmpEqNull)
+        MOTH_END_INSTR(CmpEqNull)
+
+        MOTH_BEGIN_INSTR(CmpNeNull)
+        MOTH_END_INSTR(CmpNeNull)
+
+        MOTH_BEGIN_INSTR(CmpEqInt)
+        MOTH_END_INSTR(CmpEq)
+
+        MOTH_BEGIN_INSTR(CmpNeInt)
+        MOTH_END_INSTR(CmpNeInt)
+
+        MOTH_BEGIN_INSTR(CmpEq)
+        MOTH_END_INSTR(CmpEq)
+
+        MOTH_BEGIN_INSTR(CmpNe)
+        MOTH_END_INSTR(CmpNe)
+
+        MOTH_BEGIN_INSTR(CmpGt)
+        MOTH_END_INSTR(CmpGt)
+
+        MOTH_BEGIN_INSTR(CmpGe)
+        MOTH_END_INSTR(CmpGe)
+
+        MOTH_BEGIN_INSTR(CmpLt)
+        MOTH_END_INSTR(CmpLt)
+
+        MOTH_BEGIN_INSTR(CmpLe)
+        MOTH_END_INSTR(CmpLe)
+
+        MOTH_BEGIN_INSTR(CmpStrictEqual)
+        MOTH_END_INSTR(CmpStrictEqual)
+
+        MOTH_BEGIN_INSTR(CmpStrictNotEqual)
+        MOTH_END_INSTR(CmpStrictNotEqual)
+
+        MOTH_BEGIN_INSTR(CmpIn)
+        MOTH_END_INSTR(CmpIn)
+
+        MOTH_BEGIN_INSTR(CmpInstanceOf)
+        MOTH_END_INSTR(CmpInstanceOf)
+
+        MOTH_BEGIN_INSTR(JumpStrictEqualStackSlotInt)
+            labels.push_back(code - start + offset);
+        MOTH_END_INSTR(JumpStrictEqualStackSlotInt)
+
+        MOTH_BEGIN_INSTR(JumpStrictNotEqualStackSlotInt)
+            labels.push_back(code - start + offset);
+        MOTH_END_INSTR(JumpStrictNotEqualStackSlotInt)
+
+        MOTH_BEGIN_INSTR(UNot)
+        MOTH_END_INSTR(UNot)
+
+        MOTH_BEGIN_INSTR(UPlus)
+        MOTH_END_INSTR(UPlus)
+
+        MOTH_BEGIN_INSTR(UMinus)
+        MOTH_END_INSTR(UMinus)
+
+        MOTH_BEGIN_INSTR(UCompl)
+        MOTH_END_INSTR(UCompl)
+
+        MOTH_BEGIN_INSTR(Increment)
+        MOTH_END_INSTR(PreIncrement)
+
+        MOTH_BEGIN_INSTR(Decrement)
+        MOTH_END_INSTR(PreDecrement)
+
+        MOTH_BEGIN_INSTR(Add)
+        MOTH_END_INSTR(Add)
+
+        MOTH_BEGIN_INSTR(BitAnd)
+        MOTH_END_INSTR(BitAnd)
+
+        MOTH_BEGIN_INSTR(BitOr)
+        MOTH_END_INSTR(BitOr)
+
+        MOTH_BEGIN_INSTR(BitXor)
+        MOTH_END_INSTR(BitXor)
+
+        MOTH_BEGIN_INSTR(UShr)
+        MOTH_END_INSTR(UShr)
+
+        MOTH_BEGIN_INSTR(Shr)
+        MOTH_END_INSTR(Shr)
+
+        MOTH_BEGIN_INSTR(Shl)
+        MOTH_END_INSTR(Shl)
+
+        MOTH_BEGIN_INSTR(BitAndConst)
+        MOTH_END_INSTR(BitAndConst)
+
+        MOTH_BEGIN_INSTR(BitOrConst)
+        MOTH_END_INSTR(BitOr)
+
+        MOTH_BEGIN_INSTR(BitXorConst)
+        MOTH_END_INSTR(BitXor)
+
+        MOTH_BEGIN_INSTR(UShrConst)
+        MOTH_END_INSTR(UShrConst)
+
+        MOTH_BEGIN_INSTR(ShrConst)
+        MOTH_END_INSTR(ShrConst)
+
+        MOTH_BEGIN_INSTR(ShlConst)
+        MOTH_END_INSTR(ShlConst)
+
+        MOTH_BEGIN_INSTR(Mul)
+        MOTH_END_INSTR(Mul)
+
+        MOTH_BEGIN_INSTR(Div)
+        MOTH_END_INSTR(Div)
+
+        MOTH_BEGIN_INSTR(Mod)
+        MOTH_END_INSTR(Mod)
+
+        MOTH_BEGIN_INSTR(Sub)
+        MOTH_END_INSTR(Sub)
+
+        MOTH_BEGIN_INSTR(Ret)
+        MOTH_END_INSTR(Ret)
+
+#ifndef QT_NO_QML_DEBUGGER
+        MOTH_BEGIN_INSTR(Debug)
+        MOTH_END_INSTR(Debug)
+#endif // QT_NO_QML_DEBUGGER
+
+        MOTH_BEGIN_INSTR(LoadQmlContext)
+        MOTH_END_INSTR(LoadQmlContext)
+
+        MOTH_BEGIN_INSTR(LoadQmlImportedScripts)
+        MOTH_END_INSTR(LoadQmlImportedScripts)
+
+        MOTH_BEGIN_INSTR(LoadQmlSingleton)
+        MOTH_END_INSTR(LoadQmlSingleton)
+    }
+}
+#undef MOTH_BEGIN_INSTR
+#undef MOTH_END_INSTR
+
+#endif // V4_ENABLE_JIT
diff --git a/src/qml/jit/qv4jit_p.h b/src/qml/jit/qv4jit_p.h
new file mode 100644
index 0000000000..dfa2a79c48
--- /dev/null
+++ b/src/qml/jit/qv4jit_p.h
@@ -0,0 +1,265 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QV4JIT_P_H
+#define QV4JIT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <private/qv4global_p.h>
+#include <private/qv4function_p.h>
+#include <private/qv4instr_moth_p.h>
+
+//QT_REQUIRE_CONFIG(qml_jit);
+
+#define JIT_DEFINE_ARGS(nargs, ...) \
+    MOTH_EXPAND_FOR_MSVC(JIT_DEFINE_ARGS##nargs(__VA_ARGS__))
+
+#define JIT_DEFINE_ARGS0()
+#define JIT_DEFINE_ARGS1(arg) \
+    int arg
+#define JIT_DEFINE_ARGS2(arg1, arg2) \
+    int arg1, \
+    int arg2
+#define JIT_DEFINE_ARGS3(arg1, arg2, arg3) \
+    int arg1, \
+    int arg2, \
+    int arg3
+#define JIT_DEFINE_ARGS4(arg1, arg2, arg3, arg4) \
+    int arg1, \
+    int arg2, \
+    int arg3, \
+    int arg4
+
+#define JIT_DEFINE_VIRTUAL_BYTECODE_HANDLER_INSTRUCTION(name, nargs, ...) \
+    virtual void generate_##name( \
+    JIT_DEFINE_ARGS(nargs, __VA_ARGS__) \
+    ) = 0;
+
+#define JIT_DEFINE_VIRTUAL_BYTECODE_HANDLER(instr) \
+    INSTR_##instr(JIT_DEFINE_VIRTUAL_BYTECODE_HANDLER)
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+namespace JIT {
+
+class Assembler;
+
+class ByteCodeHandler
+{
+public:
+    virtual ~ByteCodeHandler();
+
+    void decode(const char *code, uint len);
+
+    int instructionOffset() const { return _offset; }
+
+protected:
+    FOR_EACH_MOTH_INSTR(JIT_DEFINE_VIRTUAL_BYTECODE_HANDLER)
+
+    virtual void startInstruction(Moth::Instr::Type instr) = 0;
+    virtual void endInstruction(Moth::Instr::Type instr) = 0;
+
+private:
+    int _offset = 0;
+};
+
+#ifdef V4_ENABLE_JIT
+class BaselineJIT final: public ByteCodeHandler
+{
+public:
+    BaselineJIT(QV4::Function *);
+    virtual ~BaselineJIT();
+
+    void generate();
+
+    void generate_Ret() Q_DECL_OVERRIDE;
+    void generate_Debug() Q_DECL_OVERRIDE;
+    void generate_LoadConst(int index) Q_DECL_OVERRIDE;
+    void generate_LoadZero() Q_DECL_OVERRIDE;
+    void generate_LoadTrue() Q_DECL_OVERRIDE;
+    void generate_LoadFalse() Q_DECL_OVERRIDE;
+    void generate_LoadNull() Q_DECL_OVERRIDE;
+    void generate_LoadUndefined() Q_DECL_OVERRIDE;
+    void generate_LoadInt(int value) Q_DECL_OVERRIDE;
+    void generate_MoveConst(int constIndex, int destTemp) Q_DECL_OVERRIDE;
+    void generate_LoadReg(int reg) Q_DECL_OVERRIDE;
+    void generate_StoreReg(int reg) Q_DECL_OVERRIDE;
+    void generate_MoveReg(int srcReg, int destReg) Q_DECL_OVERRIDE;
+    void generate_LoadLocal(int index) Q_DECL_OVERRIDE;
+    void generate_StoreLocal(int index) Q_DECL_OVERRIDE;
+    void generate_LoadScopedLocal(int scope, int index) Q_DECL_OVERRIDE;
+    void generate_StoreScopedLocal(int scope, int index) Q_DECL_OVERRIDE;
+    void generate_LoadRuntimeString(int stringId) Q_DECL_OVERRIDE;
+    void generate_LoadRegExp(int regExpId) Q_DECL_OVERRIDE;
+    void generate_LoadClosure(int value) Q_DECL_OVERRIDE;
+    void generate_LoadName(int name) Q_DECL_OVERRIDE;
+    void generate_LoadGlobalLookup(int index) Q_DECL_OVERRIDE;
+    void generate_StoreNameSloppy(int name) Q_DECL_OVERRIDE;
+    void generate_StoreNameStrict(int name) Q_DECL_OVERRIDE;
+    void generate_LoadElement(int base, int index) Q_DECL_OVERRIDE;
+    void generate_LoadElementA(int base) Q_DECL_OVERRIDE;
+    void generate_StoreElement(int base, int index) Q_DECL_OVERRIDE;
+    void generate_LoadProperty(int name, int base) Q_DECL_OVERRIDE;
+    void generate_LoadPropertyA(int name) Q_DECL_OVERRIDE;
+    void generate_GetLookup(int index, int base) Q_DECL_OVERRIDE;
+    void generate_GetLookupA(int index) Q_DECL_OVERRIDE;
+    void generate_StoreProperty(int name, int base) Q_DECL_OVERRIDE;
+    void generate_SetLookup(int index, int base) Q_DECL_OVERRIDE;
+    void generate_StoreScopeObjectProperty(int base,
+                                           int propertyIndex) Q_DECL_OVERRIDE;
+    void generate_StoreContextObjectProperty(int base,
+                                             int propertyIndex) Q_DECL_OVERRIDE;
+    void generate_LoadScopeObjectProperty(int propertyIndex, int base,
+                                          int captureRequired) Q_DECL_OVERRIDE;
+    void generate_LoadContextObjectProperty(int propertyIndex, int base,
+                                            int captureRequired) Q_DECL_OVERRIDE;
+    void generate_LoadIdObject(int index, int base) Q_DECL_OVERRIDE;
+    void generate_CallValue(int argc, int argv) Q_DECL_OVERRIDE;
+    void generate_CallProperty(int name, int base, int argc, int argv) Q_DECL_OVERRIDE;
+    void generate_CallPropertyLookup(int lookupIndex, int base, int argc, int argv) Q_DECL_OVERRIDE;
+    void generate_CallElement(int base, int index, int argc, int argv) Q_DECL_OVERRIDE;
+    void generate_CallName(int name, int argc, int argv) Q_DECL_OVERRIDE;
+    void generate_CallPossiblyDirectEval(int argc, int argv) Q_DECL_OVERRIDE;
+    void generate_CallGlobalLookup(int index, int argc, int argv) Q_DECL_OVERRIDE;
+    void generate_SetExceptionHandler(int offset) Q_DECL_OVERRIDE;
+    void generate_ThrowException() Q_DECL_OVERRIDE;
+    void generate_GetException() Q_DECL_OVERRIDE;
+    void generate_SetException() Q_DECL_OVERRIDE;
+    void generate_CreateCallContext() Q_DECL_OVERRIDE;
+    void generate_PushCatchContext(int name, int reg) Q_DECL_OVERRIDE;
+    void generate_PushWithContext(int reg) Q_DECL_OVERRIDE;
+    void generate_PopContext(int reg) Q_DECL_OVERRIDE;
+    void generate_ForeachIteratorObject() Q_DECL_OVERRIDE;
+    void generate_ForeachNextPropertyName() Q_DECL_OVERRIDE;
+    void generate_DeleteMember(int member, int base) Q_DECL_OVERRIDE;
+    void generate_DeleteSubscript(int base, int index) Q_DECL_OVERRIDE;
+    void generate_DeleteName(int name) Q_DECL_OVERRIDE;
+    void generate_TypeofName(int name) Q_DECL_OVERRIDE;
+    void generate_TypeofValue() Q_DECL_OVERRIDE;
+    void generate_DeclareVar(int varName, int isDeletable) Q_DECL_OVERRIDE;
+    void generate_DefineArray(int argc, int args) Q_DECL_OVERRIDE;
+    void generate_DefineObjectLiteral(int internalClassId, int arrayValueCount,
+                                      int arrayGetterSetterCountAndFlags,
+                                      int args) Q_DECL_OVERRIDE;
+    void generate_CreateMappedArgumentsObject() Q_DECL_OVERRIDE;
+    void generate_CreateUnmappedArgumentsObject() Q_DECL_OVERRIDE;
+    void generate_ConvertThisToObject() Q_DECL_OVERRIDE;
+    void generate_Construct(int func, int argc, int argv) Q_DECL_OVERRIDE;
+    void generate_Jump(int offset) Q_DECL_OVERRIDE;
+    void generate_JumpTrue(int offset) Q_DECL_OVERRIDE;
+    void generate_JumpFalse(int offset) Q_DECL_OVERRIDE;
+    void generate_CmpEqNull() Q_DECL_OVERRIDE;
+    void generate_CmpNeNull() Q_DECL_OVERRIDE;
+    void generate_CmpEqInt(int lhs) Q_DECL_OVERRIDE;
+    void generate_CmpNeInt(int lhs) Q_DECL_OVERRIDE;
+    void generate_CmpEq(int lhs) Q_DECL_OVERRIDE;
+    void generate_CmpNe(int lhs) Q_DECL_OVERRIDE;
+    void generate_CmpGt(int lhs) Q_DECL_OVERRIDE;
+    void generate_CmpGe(int lhs) Q_DECL_OVERRIDE;
+    void generate_CmpLt(int lhs) Q_DECL_OVERRIDE;
+    void generate_CmpLe(int lhs) Q_DECL_OVERRIDE;
+    void generate_CmpStrictEqual(int lhs) Q_DECL_OVERRIDE;
+    void generate_CmpStrictNotEqual(int lhs) Q_DECL_OVERRIDE;
+    void generate_CmpIn(int lhs) Q_DECL_OVERRIDE;
+    void generate_CmpInstanceOf(int lhs) Q_DECL_OVERRIDE;
+    void generate_JumpStrictEqualStackSlotInt(int lhs, int rhs,
+                                              int offset) Q_DECL_OVERRIDE;
+    void generate_JumpStrictNotEqualStackSlotInt(int lhs, int rhs,
+                                                 int offset) Q_DECL_OVERRIDE;
+    void generate_UNot() Q_DECL_OVERRIDE;
+    void generate_UPlus() Q_DECL_OVERRIDE;
+    void generate_UMinus() Q_DECL_OVERRIDE;
+    void generate_UCompl() Q_DECL_OVERRIDE;
+    void generate_Increment() Q_DECL_OVERRIDE;
+    void generate_Decrement() Q_DECL_OVERRIDE;
+    void generate_Add(int lhs) Q_DECL_OVERRIDE;
+    void generate_BitAnd(int lhs) Q_DECL_OVERRIDE;
+    void generate_BitOr(int lhs) Q_DECL_OVERRIDE;
+    void generate_BitXor(int lhs) Q_DECL_OVERRIDE;
+    void generate_UShr(int lhs) Q_DECL_OVERRIDE;
+    void generate_Shr(int lhs) Q_DECL_OVERRIDE;
+    void generate_Shl(int lhs) Q_DECL_OVERRIDE;
+    void generate_BitAndConst(int rhs) Q_DECL_OVERRIDE;
+    void generate_BitOrConst(int rhs) Q_DECL_OVERRIDE;
+    void generate_BitXorConst(int rhs) Q_DECL_OVERRIDE;
+    void generate_UShrConst(int rhs) Q_DECL_OVERRIDE;
+    void generate_ShrConst(int rhs) Q_DECL_OVERRIDE;
+    void generate_ShlConst(int rhs) Q_DECL_OVERRIDE;
+    void generate_Mul(int lhs) Q_DECL_OVERRIDE;
+    void generate_Div(int lhs) Q_DECL_OVERRIDE;
+    void generate_Mod(int lhs) Q_DECL_OVERRIDE;
+    void generate_Sub(int lhs) Q_DECL_OVERRIDE;
+    void generate_LoadQmlContext(int result) Q_DECL_OVERRIDE;
+    void generate_LoadQmlImportedScripts(int result) Q_DECL_OVERRIDE;
+    void generate_LoadQmlSingleton(int name) Q_DECL_OVERRIDE;
+
+    void startInstruction(Moth::Instr::Type instr) Q_DECL_OVERRIDE;
+    void endInstruction(Moth::Instr::Type instr) Q_DECL_OVERRIDE;
+
+protected:
+    bool hasLabel() const
+    { return std::find(labels.cbegin(), labels.cend(), instructionOffset()) != labels.cend(); }
+
+private:
+    void collectLabelsInBytecode();
+
+private:
+    QV4::Function *function;
+    QScopedPointer<Assembler> as;
+    std::vector<int> labels;
+};
+#endif // V4_ENABLE_JIT
+
+} // namespace JIT
+} // namespace QV4
+
+QT_END_NAMESPACE
+
+#endif // QV4JIT_P_H
diff --git a/src/qml/jit/qv4regalloc.cpp b/src/qml/jit/qv4regalloc.cpp
deleted file mode 100644
index cd2d53ab40..0000000000
--- a/src/qml/jit/qv4regalloc.cpp
+++ /dev/null
@@ -1,1971 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the V4VM module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include <QtCore/QBuffer>
-#include <QtCore/QDebug>
-#include "qv4regalloc_p.h"
-#include "qv4alloca_p.h"
-#include <private/qv4value_p.h>
-
-#include <algorithm>
-#if defined(Q_CC_MINGW)
-#  include <malloc.h>
-#endif
-
-namespace {
-enum { DebugRegAlloc = 0 };
-
-struct Use {
-    enum RegisterFlag { MustHaveRegister = 0, CouldHaveRegister = 1 };
-    unsigned flag : 1;
-    unsigned pos  : 31;
-
-    Use(): flag(MustHaveRegister), pos(0) {}
-    Use(int position, RegisterFlag flag): flag(flag), pos(position)
-    { Q_ASSERT(position >= 0); }
-
-    bool mustHaveRegister() const { return flag == MustHaveRegister; }
-};
-}
-
-QT_BEGIN_NAMESPACE
-
-Q_DECLARE_TYPEINFO(Use, Q_MOVABLE_TYPE);
-
-using namespace QV4::IR;
-
-namespace QV4 {
-namespace JIT {
-
-namespace {
-class IRPrinterWithPositions: public IRPrinter
-{
-    LifeTimeIntervals::Ptr intervals;
-    const int positionSize;
-
-public:
-    IRPrinterWithPositions(QTextStream *out, const LifeTimeIntervals::Ptr &intervals)
-        : IRPrinter(out)
-        , intervals(intervals)
-        , positionSize(QString::number(intervals->lastPosition()).size())
-    {}
-
-protected:
-    void addStmtNr(Stmt *s) override final
-    {
-        addJustifiedNr(intervals->positionForStatement(s));
-    }
-};
-
-class IRPrinterWithRegisters: public IRPrinterWithPositions
-{
-    const RegisterInformation &_registerInformation;
-    QHash<int, const RegisterInfo *> _infoForRegularRegister;
-    QHash<int, const RegisterInfo *> _infoForFPRegister;
-
-public:
-    IRPrinterWithRegisters(QTextStream *out, const LifeTimeIntervals::Ptr &intervals,
-                           const RegisterInformation &registerInformation)
-        : IRPrinterWithPositions(out, intervals)
-        , _registerInformation(registerInformation)
-    {
-        for (int i = 0, ei = _registerInformation.size(); i != ei; ++i)
-            if (_registerInformation.at(i).isRegularRegister())
-                _infoForRegularRegister.insert(_registerInformation.at(i).reg<int>(),
-                                               &_registerInformation.at(i));
-            else
-                _infoForFPRegister.insert(_registerInformation.at(i).reg<int>(),
-                                          &_registerInformation.at(i));
-    }
-
-protected:
-    void visitTemp(Temp *e) override final
-    {
-        switch (e->kind) {
-        case Temp::PhysicalRegister: {
-            const RegisterInfo *ri = e->type == DoubleType ? _infoForFPRegister.value(e->index, 0)
-                                                           : _infoForRegularRegister.value(e->index, 0);
-            if (ri) {
-                *out << ri->prettyName();
-                break;
-            }
-            Q_FALLTHROUGH();
-        }
-        default:
-            IRPrinterWithPositions::visitTemp(e);
-        }
-    }
-};
-}
-
-class RegAllocInfo: public IRDecoder
-{
-public:
-    typedef QVarLengthArray<Temp, 4> Hints;
-
-private:
-    struct Def {
-        unsigned valid : 1;
-        unsigned canHaveReg : 1;
-        unsigned isPhiTarget : 1;
-
-        Def(): valid(0), canHaveReg(0), isPhiTarget(0) {}
-        Def(bool canHaveReg, bool isPhiTarget)
-            : valid(1), canHaveReg(canHaveReg), isPhiTarget(isPhiTarget)
-        {
-        }
-
-        bool isValid() const { return valid != 0; }
-    };
-
-    IR::LifeTimeIntervals::Ptr _lifeTimeIntervals;
-    BasicBlock *_currentBB;
-    Stmt *_currentStmt;
-    std::vector<Def> _defs;
-    std::vector<std::vector<Use> > _uses;
-    std::vector<int> _calls;
-    std::vector<Hints> _hints;
-
-    int usePosition(Stmt *s) const
-    {
-        int usePos = _lifeTimeIntervals->positionForStatement(s);
-        if (usePos == Stmt::InvalidId) // phi-node operand, so:
-            usePos = _lifeTimeIntervals->startPosition(_currentBB);
-        return usePos;
-    }
-
-public:
-    RegAllocInfo(): _currentBB(0), _currentStmt(0) {}
-
-    void collect(IR::Function *function, const IR::LifeTimeIntervals::Ptr &lifeTimeIntervals)
-    {
-        _lifeTimeIntervals = lifeTimeIntervals;
-        _defs.resize(function->tempCount);
-        _uses.resize(function->tempCount);
-        _calls.reserve(function->statementCount() / 3);
-        _hints.resize(function->tempCount);
-
-        for (BasicBlock *bb : function->basicBlocks()) {
-            _currentBB = bb;
-            for (Stmt *s : bb->statements()) {
-                _currentStmt = s;
-                visit(s);
-            }
-        }
-    }
-
-    const std::vector<Use> &uses(const Temp &t) const
-    {
-        return _uses.at(t.index);
-    }
-
-    bool canHaveRegister(const Temp &t) const {
-        Q_ASSERT(_defs[t.index].isValid());
-        return _defs[t.index].canHaveReg;
-    }
-    bool isPhiTarget(const Temp &t) const {
-        Q_ASSERT(_defs[t.index].isValid());
-        return _defs[t.index].isPhiTarget;
-    }
-
-    const std::vector<int> &calls() const { return _calls; }
-    const Hints &hints(const Temp &t) const { return _hints[t.index]; }
-    void addHint(const Temp &t, int physicalRegister)
-    { addHint(t, Temp::PhysicalRegister, physicalRegister); }
-
-    void addHint(const Temp &t, Temp::Kind kind, int hintedIndex)
-    {
-        Hints &hints = _hints[t.index];
-        for (Hints::iterator i = hints.begin(), ei = hints.end(); i != ei; ++i)
-            if (i->index == hintedIndex)
-                return;
-
-        Temp hint;
-        hint.init(kind, hintedIndex);
-        hints.append(hint);
-    }
-
-    void dump() const
-    {
-        if (!DebugRegAlloc)
-            return;
-
-        QBuffer buf;
-        buf.open(QIODevice::WriteOnly);
-        QTextStream qout(&buf);
-        IRPrinterWithPositions printer(&qout, _lifeTimeIntervals);
-
-        qout << "RegAllocInfo:" << endl << "Defs/uses:" << endl;
-        for (unsigned t = 0; t < _defs.size(); ++t) {
-            const std::vector<Use> &uses = _uses[t];
-            if (uses.empty())
-                continue;
-            qout << "%" << t <<": "
-                 << " ("
-                 << (_defs[t].canHaveReg ? "can" : "can NOT")
-                 << " have a register, and "
-                 << (_defs[t].isPhiTarget ? "is" : "is NOT")
-                 << " defined by a phi node), uses at: ";
-            for (unsigned i = 0; i < uses.size(); ++i) {
-                if (i > 0) qout << ", ";
-                qout << uses[i].pos;
-                if (uses[i].mustHaveRegister()) qout << "(R)"; else qout << "(S)";
-            }
-            qout << endl;
-        }
-
-        qout << "Calls at: ";
-        for (unsigned i = 0; i < _calls.size(); ++i) {
-            if (i > 0) qout << ", ";
-            qout << _calls[i];
-        }
-        qout << endl;
-
-        qout << "Hints:" << endl;
-        for (unsigned t = 0; t < _hints.size(); ++t) {
-            if (_uses[t].empty())
-                continue;
-            qout << "\t%" << t << ": ";
-            const Hints &hints = _hints[t];
-            for (int i = 0; i < hints.size(); ++i) {
-                if (i > 0) qout << ", ";
-                printer.print(hints[i]);
-            }
-            qout << endl;
-        }
-        qDebug("%s", buf.data().constData());
-    }
-
-protected: // IRDecoder
-    void callBuiltinInvalid(IR::Name *, IR::ExprList *, IR::Expr *) override {}
-    void callBuiltinTypeofQmlContextProperty(IR::Expr *, IR::Member::MemberKind, int, IR::Expr *) override {}
-    void callBuiltinTypeofMember(IR::Expr *, const QString &, IR::Expr *) override {}
-    void callBuiltinTypeofSubscript(IR::Expr *, IR::Expr *, IR::Expr *) override {}
-    void callBuiltinTypeofName(const QString &, IR::Expr *) override {}
-    void callBuiltinTypeofValue(IR::Expr *, IR::Expr *) override {}
-    void callBuiltinDeleteMember(IR::Expr *, const QString &, IR::Expr *) override {}
-    void callBuiltinDeleteSubscript(IR::Expr *, IR::Expr *, IR::Expr *) override {}
-    void callBuiltinDeleteName(const QString &, IR::Expr *) override {}
-    void callBuiltinDeleteValue(IR::Expr *) override {}
-    void callBuiltinThrow(IR::Expr *) override {}
-    void callBuiltinReThrow() override {}
-    void callBuiltinUnwindException(IR::Expr *) override {}
-    void callBuiltinPushCatchScope(const QString &) override {};
-    void callBuiltinForeachIteratorObject(IR::Expr *, IR::Expr *) override {}
-    virtual void callBuiltinForeachNextProperty(IR::Temp *, IR::Temp *) {}
-    void callBuiltinForeachNextPropertyname(IR::Expr *, IR::Expr *) override {}
-    void callBuiltinPushWithScope(IR::Expr *) override {}
-    void callBuiltinPopScope() override {}
-    void callBuiltinDeclareVar(bool , const QString &) override {}
-    void callBuiltinDefineArray(IR::Expr *, IR::ExprList *) override {}
-    void callBuiltinDefineObjectLiteral(IR::Expr *, int, IR::ExprList *, IR::ExprList *, bool) override {}
-    void callBuiltinSetupArgumentObject(IR::Expr *) override {}
-    void callBuiltinConvertThisToObject() override {}
-
-    void callValue(IR::Expr *value, IR::ExprList *args, IR::Expr *result) override
-    {
-        addDef(result);
-        if (IR::Temp *tempValue = value->asTemp())
-            addUses(tempValue, Use::CouldHaveRegister);
-        addUses(args, Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void callQmlContextProperty(IR::Expr *base, IR::Member::MemberKind /*kind*/, int propertyIndex,
-                                        IR::ExprList *args, IR::Expr *result) override
-    {
-        Q_UNUSED(propertyIndex)
-
-        addDef(result);
-        addUses(base->asTemp(), Use::CouldHaveRegister);
-        addUses(args, Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void callProperty(IR::Expr *base, const QString &name, IR::ExprList *args,
-                      IR::Expr *result) override
-    {
-        Q_UNUSED(name)
-
-        addDef(result);
-        addUses(base->asTemp(), Use::CouldHaveRegister);
-        addUses(args, Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void callSubscript(IR::Expr *base, IR::Expr *index, IR::ExprList *args,
-                       IR::Expr *result) override
-    {
-        addDef(result);
-        addUses(base->asTemp(), Use::CouldHaveRegister);
-        addUses(index->asTemp(), Use::CouldHaveRegister);
-        addUses(args, Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void convertType(IR::Expr *source, IR::Expr *target) override
-    {
-        addDef(target);
-
-        bool needsCall = true;
-        Use::RegisterFlag sourceReg = Use::CouldHaveRegister;
-
-        switch (target->type) {
-        case DoubleType:
-            switch (source->type) {
-            case UInt32Type:
-            case SInt32Type:
-            case NullType:
-            case UndefinedType:
-            case BoolType:
-                needsCall = false;
-                break;
-            default:
-                break;
-            }
-            break;
-        case BoolType:
-            switch (source->type) {
-            case UInt32Type:
-                sourceReg = Use::MustHaveRegister;
-                needsCall = false;
-                break;
-            case DoubleType:
-            case UndefinedType:
-            case NullType:
-            case SInt32Type:
-                needsCall = false;
-                break;
-            default:
-                break;
-            }
-            break;
-        case SInt32Type:
-            switch (source->type) {
-            case UInt32Type:
-            case NullType:
-            case UndefinedType:
-            case BoolType:
-                needsCall = false;
-            default:
-                break;
-            }
-            break;
-        case UInt32Type:
-            switch (source->type) {
-            case SInt32Type:
-            case NullType:
-            case UndefinedType:
-            case BoolType:
-                needsCall = false;
-            default:
-                break;
-            }
-            break;
-        default:
-            break;
-        }
-
-        Temp *sourceTemp = source->asTemp();
-        if (sourceTemp)
-            addUses(sourceTemp, sourceReg);
-
-        if (needsCall)
-            addCall();
-        else if (target->asTemp())
-            addHint(target->asTemp(), sourceTemp);
-    }
-
-    void constructActivationProperty(IR::Name *, IR::ExprList *args, IR::Expr *result) override
-    {
-        addDef(result);
-        addUses(args, Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void constructProperty(IR::Expr *base, const QString &, IR::ExprList *args, IR::Expr *result) override
-    {
-        addDef(result);
-        addUses(base, Use::CouldHaveRegister);
-        addUses(args, Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void constructValue(IR::Expr *value, IR::ExprList *args, IR::Expr *result) override
-    {
-        addDef(result);
-        addUses(value, Use::CouldHaveRegister);
-        addUses(args, Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void loadThisObject(IR::Expr *temp) override
-    {
-        addDef(temp);
-    }
-
-    void loadQmlContext(IR::Expr *temp) override
-    {
-        addDef(temp);
-        addCall();
-    }
-
-    void loadQmlImportedScripts(IR::Expr *temp) override
-    {
-        addDef(temp);
-        addCall();
-    }
-
-    void loadQmlSingleton(const QString &/*name*/, Expr *temp) override
-    {
-        Q_UNUSED(temp);
-
-        addDef(temp);
-        addCall();
-    }
-
-    void loadConst(IR::Const *sourceConst, Expr *targetTemp) override
-    {
-        Q_UNUSED(sourceConst);
-
-        addDef(targetTemp);
-    }
-
-    void loadString(const QString &str, Expr *targetTemp) override
-    {
-        Q_UNUSED(str);
-
-        addDef(targetTemp);
-    }
-
-    void loadRegexp(IR::RegExp *sourceRegexp, Expr *targetTemp) override
-    {
-        Q_UNUSED(sourceRegexp);
-
-        addDef(targetTemp);
-        addCall();
-    }
-
-    void getActivationProperty(const IR::Name *, Expr *temp) override
-    {
-        addDef(temp);
-        addCall();
-    }
-
-    void setActivationProperty(IR::Expr *source, const QString &) override
-    {
-        addUses(source->asTemp(), Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void initClosure(IR::Closure *closure, Expr *target) override
-    {
-        Q_UNUSED(closure);
-
-        addDef(target);
-        addCall();
-    }
-
-    void getProperty(IR::Expr *base, const QString &, Expr *target) override
-    {
-        addDef(target);
-        addUses(base->asTemp(), Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void setProperty(IR::Expr *source, IR::Expr *targetBase, const QString &) override
-    {
-        addUses(source->asTemp(), Use::CouldHaveRegister);
-        addUses(targetBase->asTemp(), Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void setQmlContextProperty(IR::Expr *source, IR::Expr *targetBase,
-                               IR::Member::MemberKind /*kind*/, int /*propertyIndex*/) override
-    {
-        addUses(source->asTemp(), Use::CouldHaveRegister);
-        addUses(targetBase->asTemp(), Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void setQObjectProperty(IR::Expr *source, IR::Expr *targetBase, int /*propertyIndex*/) override
-    {
-        addUses(source->asTemp(), Use::CouldHaveRegister);
-        addUses(targetBase->asTemp(), Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void getQmlContextProperty(IR::Expr *base, IR::Member::MemberKind /*kind*/, int /*index*/,
-                               bool /*captureRequired*/, IR::Expr *target) override
-    {
-        addDef(target);
-        addUses(base->asTemp(), Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void getQObjectProperty(IR::Expr *base, int /*propertyIndex*/, bool /*captureRequired*/,
-                            bool /*isSingleton*/, int /*attachedPropertiesId*/, IR::Expr *target) override
-    {
-        addDef(target);
-        addUses(base->asTemp(), Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void getElement(IR::Expr *base, IR::Expr *index, Expr *target) override
-    {
-        addDef(target);
-        addUses(base->asTemp(), Use::CouldHaveRegister);
-        addUses(index->asTemp(), Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void setElement(IR::Expr *source, IR::Expr *targetBase, IR::Expr *targetIndex) override
-    {
-        addUses(source->asTemp(), Use::CouldHaveRegister);
-        addUses(targetBase->asTemp(), Use::CouldHaveRegister);
-        addUses(targetIndex->asTemp(), Use::CouldHaveRegister);
-        addCall();
-    }
-
-    void copyValue(Expr *source, Expr *target) override
-    {
-        addDef(target);
-        Temp *sourceTemp = source->asTemp();
-        if (!sourceTemp)
-            return;
-        addUses(sourceTemp, Use::CouldHaveRegister);
-        Temp *targetTemp = target->asTemp();
-        if (targetTemp)
-            addHint(targetTemp, sourceTemp);
-    }
-
-    void swapValues(Expr *, Expr *) override
-    {
-        // Inserted by the register allocator, so it cannot occur here.
-        Q_UNREACHABLE();
-    }
-
-    void unop(AluOp oper, Expr *source, Expr *target) override
-    {
-        addDef(target);
-
-        bool needsCall = true;
-        if (oper == OpNot && source->type == IR::BoolType && target->type == IR::BoolType)
-            needsCall = false;
-
-#if 0 // TODO: change masm to generate code
-        switch (oper) {
-        case OpIfTrue:
-        case OpNot:
-        case OpUMinus:
-        case OpUPlus:
-        case OpCompl:
-            needsCall = sourceTemp->type & ~NumberType && sourceTemp->type != BoolType;
-            break;
-
-        case OpIncrement:
-        case OpDecrement:
-        default:
-            Q_UNREACHABLE();
-        }
-#endif
-
-        IR::Temp *sourceTemp = source->asTemp();
-        if (needsCall) {
-            if (sourceTemp)
-                addUses(sourceTemp, Use::CouldHaveRegister);
-            addCall();
-        } else {
-            if (sourceTemp)
-                addUses(sourceTemp, Use::MustHaveRegister);
-        }
-    }
-
-    void binop(AluOp oper, Expr *leftSource, Expr *rightSource, Expr *target) override
-    {
-        bool needsCall = true;
-
-        if (oper == OpStrictEqual || oper == OpStrictNotEqual) {
-            bool noCall = leftSource->type == NullType || rightSource->type == NullType
-                    || leftSource->type == UndefinedType || rightSource->type == UndefinedType
-                    || leftSource->type == BoolType || rightSource->type == BoolType;
-            needsCall = !noCall;
-        } else if (leftSource->type == DoubleType && rightSource->type == DoubleType) {
-            if (oper == OpMul || oper == OpAdd || oper == OpDiv || oper == OpSub
-                    || (oper >= OpGt && oper <= OpStrictNotEqual)) {
-                needsCall = false;
-            }
-        } else if (oper == OpBitAnd || oper == OpBitOr || oper == OpBitXor || oper == OpLShift || oper == OpRShift || oper == OpURShift) {
-            needsCall = false;
-        } else if (oper == OpAdd || oper == OpMul || oper == OpSub
-                   || (oper >= OpGt && oper <= OpStrictNotEqual)) {
-            if (leftSource->type == SInt32Type && rightSource->type == SInt32Type)
-                needsCall = false;
-        }
-
-        addDef(target);
-
-        if (needsCall) {
-            addUses(leftSource->asTemp(), Use::CouldHaveRegister);
-            addUses(rightSource->asTemp(), Use::CouldHaveRegister);
-            addCall();
-        } else {
-            addUses(leftSource->asTemp(), Use::MustHaveRegister);
-            addHint(target, leftSource->asTemp());
-            addHint(target, rightSource->asTemp());
-
-#if CPU(X86) || CPU(X86_64)
-            switch (oper) {
-                // The rhs operand can be a memory address
-            case OpAdd:
-            case OpSub:
-            case OpMul:
-            case OpDiv:
-#if CPU(X86_64)
-                if (leftSource->type == DoubleType || rightSource->type == DoubleType) {
-                    // well, on 64bit the doubles are mangled, so they must first be loaded in a register and demangled, so...:
-                    addUses(rightSource->asTemp(), Use::MustHaveRegister);
-                    break;
-                }
-                Q_FALLTHROUGH();
-#endif
-            case OpBitAnd:
-            case OpBitOr:
-            case OpBitXor:
-                addUses(rightSource->asTemp(), Use::CouldHaveRegister);
-                break;
-
-            default:
-                addUses(rightSource->asTemp(), Use::MustHaveRegister);
-                break;
-            }
-#else
-            addUses(rightSource->asTemp(), Use::MustHaveRegister);
-#endif
-        }
-    }
-
-    void visitJump(IR::Jump *) override {}
-    void visitCJump(IR::CJump *s) override
-    {
-        if (Temp *t = s->cond->asTemp()) {
-#if 0 // TODO: change masm to generate code
-            addUses(t, Use::MustHaveRegister);
-#else
-            addUses(t, Use::CouldHaveRegister);
-            addCall();
-#endif
-        } else if (Binop *b = s->cond->asBinop()) {
-            binop(b->op, b->left, b->right, 0);
-        } else if (s->cond->asConst()) {
-            // TODO: SSA optimization for constant condition evaluation should remove this.
-            // See also visitCJump() in masm.
-            addCall();
-        } else {
-            Q_UNREACHABLE();
-        }
-    }
-
-    void visitRet(IR::Ret *s) override
-    { addUses(s->expr->asTemp(), Use::CouldHaveRegister); }
-
-    void visitPhi(IR::Phi *s) override
-    {
-        addDef(s->targetTemp, true);
-        for (int i = 0, ei = s->incoming.size(); i < ei; ++i) {
-            Expr *e = s->incoming.at(i);
-            if (Temp *t = e->asTemp()) {
-                // The actual use of an incoming value in a phi node is right before the terminator
-                // of the other side of the incoming edge.
-                const int usePos = _lifeTimeIntervals->positionForStatement(_currentBB->in.at(i)->terminator()) - 1;
-                addUses(t, Use::CouldHaveRegister, usePos);
-                addHint(s->targetTemp, t);
-                addHint(t, s->targetTemp);
-            }
-        }
-    }
-
-protected:
-    void callBuiltin(IR::Call *c, IR::Expr *result) override
-    {
-        addDef(result);
-        addUses(c->base, Use::CouldHaveRegister);
-        addUses(c->args, Use::CouldHaveRegister);
-        addCall();
-    }
-
-private:
-    void addDef(Expr *e, bool isPhiTarget = false)
-    {
-        if (!e)
-            return;
-        Temp *t = e->asTemp();
-        if (!t)
-            return;
-        if (!t || t->kind != Temp::VirtualRegister)
-            return;
-        Q_ASSERT(!_defs[t->index].isValid());
-        bool canHaveReg = true;
-        switch (t->type) {
-        case QObjectType:
-        case VarType:
-        case StringType:
-        case UndefinedType:
-        case NullType:
-            canHaveReg = false;
-            break;
-        default:
-            break;
-        }
-
-        _defs[t->index] = Def(canHaveReg, isPhiTarget);
-    }
-
-    void addUses(Expr *e, Use::RegisterFlag flag)
-    {
-        const int usePos = usePosition(_currentStmt);
-        addUses(e, flag, usePos);
-    }
-
-    void addUses(Expr *e, Use::RegisterFlag flag, int usePos)
-    {
-        Q_ASSERT(usePos > 0);
-        if (!e)
-            return;
-        Temp *t = e->asTemp();
-        if (!t)
-            return;
-        if (t && t->kind == Temp::VirtualRegister)
-            _uses[t->index].push_back(Use(usePos, flag));
-    }
-
-    void addUses(ExprList *l, Use::RegisterFlag flag)
-    {
-        for (ExprList *it = l; it; it = it->next)
-            addUses(it->expr, flag);
-    }
-
-    void addCall()
-    {
-        _calls.push_back(usePosition(_currentStmt));
-    }
-
-    void addHint(Expr *hinted, Temp *hint1, Temp *hint2 = 0)
-    {
-        if (hinted)
-            if (Temp *hintedTemp = hinted->asTemp())
-                addHint(hintedTemp, hint1, hint2);
-    }
-
-    void addHint(Temp *hinted, Temp *hint1, Temp *hint2 = 0)
-    {
-        if (!hinted || hinted->kind != Temp::VirtualRegister)
-            return;
-        if (hint1 && hint1->kind == Temp::VirtualRegister && hinted->type == hint1->type)
-            addHint(*hinted, Temp::VirtualRegister, hint1->index);
-        if (hint2 && hint2->kind == Temp::VirtualRegister && hinted->type == hint2->type)
-            addHint(*hinted, Temp::VirtualRegister, hint2->index);
-    }
-};
-
-} // JIT namespace
-} // QV4 namespace
-QT_END_NAMESPACE
-
-QT_USE_NAMESPACE
-
-using namespace QT_PREPEND_NAMESPACE(QV4::JIT);
-using namespace QT_PREPEND_NAMESPACE(QV4::IR);
-using namespace QT_PREPEND_NAMESPACE(QV4);
-
-namespace {
-class ResolutionPhase
-{
-    Q_DISABLE_COPY(ResolutionPhase)
-
-    LifeTimeIntervals::Ptr _intervals;
-    QVector<LifeTimeInterval *> _unprocessedReverseOrder;
-    IR::Function *_function;
-    const std::vector<int> &_assignedSpillSlots;
-    std::vector<const LifeTimeInterval *> _liveIntervals;
-    const QVector<const RegisterInfo *> &_intRegs;
-    const QVector<const RegisterInfo *> &_fpRegs;
-
-    Stmt *_currentStmt;
-    std::vector<Move *> _loads;
-    std::vector<Move *> _stores;
-
-    std::vector<std::vector<const LifeTimeInterval *> > _liveAtStart;
-    std::vector<std::vector<const LifeTimeInterval *> > _liveAtEnd;
-
-public:
-    ResolutionPhase(QVector<LifeTimeInterval *> &&unprocessedReversedOrder,
-                    const LifeTimeIntervals::Ptr &intervals,
-                    IR::Function *function,
-                    const std::vector<int> &assignedSpillSlots,
-                    const QVector<const RegisterInfo *> &intRegs,
-                    const QVector<const RegisterInfo *> &fpRegs)
-        : _intervals(intervals)
-        , _unprocessedReverseOrder(unprocessedReversedOrder)
-        , _function(function)
-        , _assignedSpillSlots(assignedSpillSlots)
-        , _intRegs(intRegs)
-        , _fpRegs(fpRegs)
-        , _currentStmt(0)
-    {
-        _liveAtStart.resize(function->basicBlockCount());
-        _liveAtEnd.resize(function->basicBlockCount());
-    }
-
-    void run() {
-        renumber();
-        if (DebugRegAlloc) {
-            QBuffer buf;
-            buf.open(QIODevice::WriteOnly);
-            QTextStream qout(&buf);
-            IRPrinterWithPositions(&qout, _intervals).print(_function);
-            qDebug("%s", buf.data().constData());
-        }
-        resolve();
-    }
-
-private:
-    int defPosition(Stmt *s) const
-    {
-        return usePosition(s) + 1;
-    }
-
-    int usePosition(Stmt *s) const
-    {
-        return _intervals->positionForStatement(s);
-    }
-
-    void renumber()
-    {
-        QVector<Stmt *> newStatements;
-
-        for (BasicBlock *bb : _function->basicBlocks()) {
-            _currentStmt = 0;
-
-            QVector<Stmt *> statements = bb->statements();
-            newStatements.reserve(bb->statements().size() + 7);
-            newStatements.erase(newStatements.begin(), newStatements.end());
-
-            cleanOldIntervals(_intervals->startPosition(bb));
-            addNewIntervals(_intervals->startPosition(bb));
-            _liveAtStart[bb->index()] = _liveIntervals;
-
-            for (int i = 0, ei = statements.size(); i != ei; ++i) {
-                _currentStmt = statements.at(i);
-                _loads.clear();
-                _stores.clear();
-                if (_currentStmt->asTerminator())
-                    addNewIntervals(usePosition(_currentStmt));
-                else
-                    addNewIntervals(defPosition(_currentStmt));
-                visit(_currentStmt);
-                for (Move *load : _loads)
-                    newStatements.append(load);
-                if (_currentStmt->asPhi())
-                    newStatements.prepend(_currentStmt);
-                else
-                    newStatements.append(_currentStmt);
-                for (Move *store : _stores)
-                    newStatements.append(store);
-            }
-
-            cleanOldIntervals(_intervals->endPosition(bb));
-            _liveAtEnd[bb->index()] = _liveIntervals;
-
-            if (DebugRegAlloc) {
-                QBuffer buf;
-                buf.open(QIODevice::WriteOnly);
-                QTextStream os(&buf);
-                os << "Intervals live at the start of L" << bb->index() << ":" << endl;
-                if (_liveAtStart[bb->index()].empty())
-                    os << "\t(none)" << endl;
-                for (const LifeTimeInterval *i : _liveAtStart.at(bb->index())) {
-                    os << "\t";
-                    i->dump(os);
-                    os << endl;
-                }
-                os << "Intervals live at the end of L" << bb->index() << ":" << endl;
-                if (_liveAtEnd[bb->index()].empty())
-                    os << "\t(none)" << endl;
-                for (const LifeTimeInterval *i : _liveAtEnd.at(bb->index())) {
-                    os << "\t";
-                    i->dump(os);
-                    os << endl;
-                }
-                qDebug("%s", buf.data().constData());
-            }
-
-            bb->setStatements(newStatements);
-        }
-
-    }
-
-    const LifeTimeInterval *findLiveInterval(Temp *t) const
-    {
-        for (const LifeTimeInterval *lti : _liveIntervals) {
-            if (lti->temp() == *t)
-                return lti;
-        }
-
-        return nullptr;
-    }
-
-    void maybeGenerateSpill(Temp *t)
-    {
-        const LifeTimeInterval *i = findLiveInterval(t);
-        if (i->reg() == LifeTimeInterval::InvalidRegister)
-            return;
-
-        const RegisterInfo *pReg = platformRegister(*i);
-        Q_ASSERT(pReg);
-        int spillSlot = _assignedSpillSlots[i->temp().index];
-        if (spillSlot != RegisterAllocator::InvalidSpillSlot)
-            _stores.push_back(generateSpill(spillSlot, i->temp().type, pReg->reg<int>()));
-    }
-
-    void addNewIntervals(int position)
-    {
-        if (position == Stmt::InvalidId)
-            return;
-
-        while (!_unprocessedReverseOrder.isEmpty()) {
-            const LifeTimeInterval *i = _unprocessedReverseOrder.constLast();
-            if (i->start() > position)
-                break;
-
-            Q_ASSERT(!i->isFixedInterval());
-            auto it = _liveIntervals.begin();
-            for (; it != _liveIntervals.end(); ++it) {
-                if ((*it)->temp() == i->temp()) {
-                    *it = i;
-                    break;
-                }
-            }
-            if (it == _liveIntervals.end())
-                _liveIntervals.push_back(i);
-//            qDebug() << "-- Activating interval for temp" << i->temp().index;
-
-            _unprocessedReverseOrder.removeLast();
-        }
-    }
-
-    void cleanOldIntervals(int position)
-    {
-        for (size_t it = 0; it != _liveIntervals.size(); ) {
-            const LifeTimeInterval *lti = _liveIntervals.at(it);
-            if (lti->end() < position || lti->isFixedInterval())
-                _liveIntervals.erase(_liveIntervals.begin() + it);
-            else
-                ++it;
-        }
-    }
-
-    void resolve()
-    {
-        for (BasicBlock *bb : _function->basicBlocks()) {
-            for (BasicBlock *bbOut : bb->out)
-                resolveEdge(bb, bbOut);
-        }
-    }
-
-    Phi *findDefPhi(const Temp &t, BasicBlock *bb) const
-    {
-        for (Stmt *s : bb->statements()) {
-            Phi *phi = s->asPhi();
-            if (!phi)
-                return 0;
-
-            if (*phi->targetTemp == t)
-                return phi;
-        }
-
-        Q_UNREACHABLE();
-    }
-
-    void resolveEdge(BasicBlock *predecessor, BasicBlock *successor)
-    {
-        if (DebugRegAlloc) {
-            qDebug() << "Resolving edge" << predecessor->index() << "->" << successor->index();
-            QBuffer buf;
-            buf.open(QIODevice::WriteOnly);
-            QTextStream qout(&buf);
-            IRPrinterWithPositions printer(&qout, _intervals);
-            printer.print(predecessor);
-            printer.print(successor);
-            qDebug("%s", buf.data().constData());
-        }
-
-        MoveMapping mapping;
-
-        const int predecessorEnd = _intervals->endPosition(predecessor);
-        Q_ASSERT(predecessorEnd > 0);
-
-        int successorStart = _intervals->startPosition(successor);
-        Q_ASSERT(successorStart > 0);
-
-        for (const LifeTimeInterval *it : _liveAtStart.at(successor->index())) {
-            bool isPhiTarget = false;
-            Expr *moveFrom = 0;
-
-            if (it->start() == successorStart) {
-                if (Phi *phi = findDefPhi(it->temp(), successor)) {
-                    isPhiTarget = true;
-                    Expr *opd = phi->incoming[successor->in.indexOf(predecessor)];
-                    if (opd->asConst()) {
-                        moveFrom = opd;
-                    } else {
-                        Temp *t = opd->asTemp();
-                        Q_ASSERT(t);
-
-                        for (const LifeTimeInterval *it2 : _liveAtEnd.at(predecessor->index())) {
-                            if (it2->temp() == *t
-                                    && it2->reg() != LifeTimeInterval::InvalidRegister
-                                    && it2->covers(predecessorEnd)) {
-                                moveFrom = createPhysicalRegister(it2, t->type);
-                                break;
-                            }
-                        }
-                        if (!moveFrom)
-                            moveFrom = createTemp(Temp::StackSlot,
-                                                  _assignedSpillSlots[t->index],
-                                    t->type);
-                    }
-                }
-            } else {
-                for (const LifeTimeInterval *predIt : _liveAtEnd.at(predecessor->index())) {
-                    if (predIt->temp() == it->temp()) {
-                        if (predIt->reg() != LifeTimeInterval::InvalidRegister
-                                && predIt->covers(predecessorEnd)) {
-                            moveFrom = createPhysicalRegister(predIt, predIt->temp().type);
-                        } else {
-                            int spillSlot = _assignedSpillSlots[predIt->temp().index];
-                            if (spillSlot != -1)
-                                moveFrom = createTemp(Temp::StackSlot, spillSlot, predIt->temp().type);
-                        }
-                        break;
-                    }
-                }
-            }
-            if (!moveFrom) {
-#if !defined(QT_NO_DEBUG) && 0
-                bool lifeTimeHole = false;
-                if (it->ranges().first().start <= successorStart && it->ranges().last().end >= successorStart)
-                    lifeTimeHole = !it->covers(successorStart);
-
-                Q_ASSERT(!_info->isPhiTarget(it->temp()) || it->isSplitFromInterval() || lifeTimeHole);
-                if (_info->def(it->temp()) != successorStart && !it->isSplitFromInterval()) {
-                    const int successorEnd = successor->terminator()->id();
-                    const int idx = successor->in.indexOf(predecessor);
-                    for (const Use &use : _info->uses(it->temp)) {
-                        if (use.pos == static_cast<unsigned>(successorStart)) {
-                            // only check the current edge, not all other possible ones. This is
-                            // important for phi nodes: they have uses that are only valid when
-                            // coming in over a specific edge.
-                            for (Stmt *s : successor->statements()) {
-                                if (Phi *phi = s->asPhi()) {
-                                    Q_ASSERT(it->temp().index != phi->targetTemp->index);
-                                    Q_ASSERT(phi->d->incoming[idx]->asTemp() == 0
-                                             || it->temp().index != phi->d->incoming[idx]->asTemp()->index);
-                                } else {
-                                    // TODO: check that the first non-phi statement does not use
-                                    // the temp.
-                                    break;
-                                }
-                            }
-                        } else {
-                            Q_ASSERT(use.pos < static_cast<unsigned>(successorStart) ||
-                                     use.pos > static_cast<unsigned>(successorEnd));
-                        }
-                    }
-                }
-#endif
-
-                continue;
-            }
-
-            Temp *moveTo;
-            if (it->reg() == LifeTimeInterval::InvalidRegister || !it->covers(successorStart)) {
-                if (!isPhiTarget) // if it->temp() is a phi target, skip it.
-                    continue;
-                const int spillSlot = _assignedSpillSlots[it->temp().index];
-                if (spillSlot == RegisterAllocator::InvalidSpillSlot)
-                    continue; // it has a life-time hole here.
-                moveTo = createTemp(Temp::StackSlot, spillSlot, it->temp().type);
-            } else {
-                moveTo = createPhysicalRegister(it, it->temp().type);
-            }
-
-            // add move to mapping
-            mapping.add(moveFrom, moveTo);
-        }
-
-        if (DebugRegAlloc)
-            mapping.dump();
-        mapping.order();
-        if (DebugRegAlloc)
-            mapping.dump();
-
-        bool insertIntoPredecessor = successor->in.size() > 1;
-        mapping.insertMoves(insertIntoPredecessor ? predecessor : successor, _function,
-                            insertIntoPredecessor);
-
-        if (DebugRegAlloc) {
-            qDebug() << ".. done, result:";
-            QBuffer buf;
-            buf.open(QIODevice::WriteOnly);
-            QTextStream qout(&buf);
-            IRPrinterWithPositions printer(&qout, _intervals);
-            printer.print(predecessor);
-            printer.print(successor);
-            qDebug("%s", buf.data().constData());
-        }
-    }
-
-    Temp *createTemp(Temp::Kind kind, int index, Type type) const
-    {
-        Q_ASSERT(index >= 0);
-        Temp *t = _function->New<Temp>();
-        t->init(kind, index);
-        t->type = type;
-        return t;
-    }
-
-    Temp *createPhysicalRegister(const LifeTimeInterval *i, Type type) const
-    {
-        const RegisterInfo *ri = platformRegister(*i);
-        Q_ASSERT(ri);
-        return createTemp(Temp::PhysicalRegister, ri->reg<int>(), type);
-    }
-
-    const RegisterInfo *platformRegister(const LifeTimeInterval &i) const
-    {
-        if (i.isFP())
-            return _fpRegs.value(i.reg(), 0);
-        else
-            return _intRegs.value(i.reg(), 0);
-    }
-
-    Move *generateSpill(int spillSlot, Type type, int pReg) const
-    {
-        Q_ASSERT(spillSlot >= 0);
-
-        Move *store = _function->NewStmt<Move>();
-        store->init(createTemp(Temp::StackSlot, spillSlot, type),
-                    createTemp(Temp::PhysicalRegister, pReg, type));
-        return store;
-    }
-
-    Move *generateUnspill(const Temp &t, int pReg) const
-    {
-        Q_ASSERT(pReg >= 0);
-        int spillSlot = _assignedSpillSlots[t.index];
-        Q_ASSERT(spillSlot != -1);
-        Move *load = _function->NewStmt<Move>();
-        load->init(createTemp(Temp::PhysicalRegister, pReg, t.type),
-                   createTemp(Temp::StackSlot, spillSlot, t.type));
-        return load;
-    }
-
-private:
-    void visit(Expr *e)
-    {
-        switch (e->exprKind) {
-        case Expr::TempExpr:
-            visitTemp(e->asTemp());
-            break;
-        default:
-            EXPR_VISIT_ALL_KINDS(e);
-            break;
-        }
-    }
-
-    void visitTemp(Temp *t)
-    {
-        if (t->kind != Temp::VirtualRegister)
-            return;
-
-        const LifeTimeInterval *i = findLiveInterval(t);
-        Q_ASSERT(i->isValid());
-
-        if (_currentStmt != 0 && i->start() == usePosition(_currentStmt)) {
-            Q_ASSERT(i->isSplitFromInterval());
-            const RegisterInfo *pReg = platformRegister(*i);
-            Q_ASSERT(pReg);
-            _loads.push_back(generateUnspill(i->temp(), pReg->reg<int>()));
-        }
-
-        if (i->reg() != LifeTimeInterval::InvalidRegister &&
-                (i->covers(defPosition(_currentStmt)) ||
-                 i->covers(usePosition(_currentStmt)))) {
-            const RegisterInfo *pReg = platformRegister(*i);
-            Q_ASSERT(pReg);
-            t->kind = Temp::PhysicalRegister;
-            t->index = pReg->reg<unsigned>();
-        } else {
-            int stackSlot = _assignedSpillSlots[t->index];
-            Q_ASSERT(stackSlot >= 0);
-            t->kind = Temp::StackSlot;
-            t->index = stackSlot;
-        }
-    }
-
-    void visit(Stmt *s)
-    {
-        switch (s->stmtKind) {
-        case Stmt::MoveStmt: {
-            auto m = s->asMove();
-            if (Temp *t = m->target->asTemp())
-                maybeGenerateSpill(t);
-
-            visit(m->source);
-            visit(m->target);
-        } break;
-        case Stmt::PhiStmt: {
-            auto p = s->asPhi();
-            maybeGenerateSpill(p->targetTemp);
-        } break;
-        default:
-            STMT_VISIT_ALL_KINDS(s);
-            break;
-        }
-    }
-};
-} // anonymous namespace
-
-RegisterAllocator::RegisterAllocator(const QV4::JIT::RegisterInformation &registerInformation)
-    : _registerInformation(registerInformation)
-{
-    for (int i = 0, ei = registerInformation.size(); i != ei; ++i) {
-        const RegisterInfo &regInfo = registerInformation.at(i);
-        if (regInfo.useForRegAlloc()) {
-            if (regInfo.isRegularRegister())
-                _normalRegisters.append(&regInfo);
-            else
-                _fpRegisters.append(&regInfo);
-        }
-    }
-    Q_ASSERT(_normalRegisters.size() >= 2);
-    Q_ASSERT(_fpRegisters.size() >= 2);
-    _active.reserve((_normalRegisters.size() + _fpRegisters.size()) * 2);
-    _inactive.reserve(_active.size());
-
-    _regularRegsInUse.resize(_normalRegisters.size());
-    _fpRegsInUse.resize(_fpRegisters.size());
-}
-
-RegisterAllocator::~RegisterAllocator()
-{
-}
-
-void RegisterAllocator::run(IR::Function *function, const Optimizer &opt)
-{
-    _lastAssignedRegister.assign(function->tempCount, LifeTimeInterval::InvalidRegister);
-    _assignedSpillSlots.assign(function->tempCount, InvalidSpillSlot);
-    _activeSpillSlots.resize(function->tempCount);
-
-    if (DebugRegAlloc)
-        qDebug() << "*** Running regalloc for function" << (function->name ? qPrintable(*function->name) : "NO NAME") << "***";
-
-    _lifeTimeIntervals = opt.lifeTimeIntervals();
-
-    _unhandled = _lifeTimeIntervals->intervals();
-    _handled.reserve(_unhandled.size());
-
-    _info.reset(new RegAllocInfo);
-    _info->collect(function, _lifeTimeIntervals);
-
-    if (DebugRegAlloc) {
-        QBuffer buf;
-        buf.open(QIODevice::WriteOnly);
-        QTextStream qout(&buf);
-        qout << "Ranges:" << endl;
-        QVector<LifeTimeInterval *> intervals = _unhandled;
-        std::reverse(intervals.begin(), intervals.end());
-        for (const LifeTimeInterval *r : qAsConst(intervals)) {
-            r->dump(qout);
-            qout << endl;
-        }
-        qDebug("%s", buf.data().constData());
-        _info->dump();
-
-        qDebug() << "*** Before register allocation:";
-        buf.setData(QByteArray());
-        IRPrinterWithPositions(&qout, _lifeTimeIntervals).print(function);
-        qDebug("%s", buf.data().constData());
-    }
-    prepareRanges();
-
-    linearScan();
-
-    if (DebugRegAlloc)
-        dump(function);
-
-    // sort the ranges in reverse order, so the ResolutionPhase can take from the end (and thereby
-    // prevent the copy overhead that taking from the beginning would give).
-    std::sort(_handled.begin(), _handled.end(),
-              [](const LifeTimeInterval *r1, const LifeTimeInterval *r2) -> bool {
-        return LifeTimeInterval::lessThan(r2, r1);
-    });
-    ResolutionPhase(std::move(_handled), _lifeTimeIntervals, function, _assignedSpillSlots, _normalRegisters, _fpRegisters).run();
-
-    function->tempCount = *std::max_element(_assignedSpillSlots.begin(), _assignedSpillSlots.end()) + 1;
-
-    if (DebugRegAlloc)
-        qDebug() << "*** Finished regalloc , result:";
-
-    static const bool showCode = qEnvironmentVariableIsSet("QV4_SHOW_IR");
-    if (showCode) {
-        QBuffer buf;
-        buf.open(QIODevice::WriteOnly);
-        QTextStream qout(&buf);
-        IRPrinterWithRegisters(&qout, _lifeTimeIntervals, _registerInformation).print(function);
-        qDebug("%s", buf.data().constData());
-    }
-}
-
-RegisterInformation RegisterAllocator::usedRegisters() const
-{
-    RegisterInformation regInfo;
-
-    for (int i = 0, ei = _normalRegisters.size(); i != ei; ++i) {
-        if (_regularRegsInUse.testBit(i))
-            regInfo.append(*_normalRegisters.at(i));
-    }
-
-    for (int i = 0, ei = _fpRegisters.size(); i != ei; ++i) {
-        if (_fpRegsInUse.testBit(i))
-            regInfo.append(*_fpRegisters.at(i));
-    }
-
-    return regInfo;
-}
-
-void RegisterAllocator::markInUse(int reg, bool isFPReg)
-{
-    if (isFPReg)
-        _fpRegsInUse.setBit(reg);
-    else
-        _regularRegsInUse.setBit(reg);
-}
-
-static inline LifeTimeInterval createFixedInterval(int rangeCount)
-{
-    LifeTimeInterval i(rangeCount);
-    i.setReg(0);
-
-    Temp t;
-    t.init(Temp::PhysicalRegister, 0);
-    t.type = IR::SInt32Type;
-    i.setTemp(t);
-
-    return i;
-}
-
-LifeTimeInterval *RegisterAllocator::cloneFixedInterval(int reg, bool isFP, const LifeTimeInterval &original)
-{
-    LifeTimeInterval *lti = new LifeTimeInterval(original);
-    _lifeTimeIntervals->add(lti);
-    lti->setReg(reg);
-    lti->setFixedInterval(true);
-
-    Temp t;
-    t.init(Temp::PhysicalRegister, reg);
-    t.type = isFP ? IR::DoubleType : IR::SInt32Type;
-    lti->setTemp(t);
-
-    return lti;
-}
-
-// Creates the intervals with fixed ranges. See [Wimmer2]. Note that this only applies to callee-
-// saved registers.
-void RegisterAllocator::prepareRanges()
-{
-    LifeTimeInterval ltiWithCalls = createFixedInterval(int(_info->calls().size()));
-    for (int callPosition : _info->calls())
-        ltiWithCalls.addRange(callPosition, callPosition);
-
-    const int regCount = _normalRegisters.size();
-    _fixedRegisterRanges.resize(regCount);
-    for (int reg = 0; reg < regCount; ++reg) {
-        if (_normalRegisters.at(reg)->isCallerSaved()) {
-            LifeTimeInterval *lti = cloneFixedInterval(reg, false, ltiWithCalls);
-            if (lti->isValid()) {
-                _fixedRegisterRanges[reg] = lti;
-                _active.append(lti);
-            }
-        }
-    }
-
-    const int fpRegCount = _fpRegisters.size();
-    _fixedFPRegisterRanges.resize(fpRegCount);
-    for (int fpReg = 0; fpReg < fpRegCount; ++fpReg) {
-        if (_fpRegisters.at(fpReg)->isCallerSaved()) {
-            LifeTimeInterval *lti = cloneFixedInterval(fpReg, true, ltiWithCalls);
-            if (lti->isValid()) {
-                _fixedFPRegisterRanges[fpReg] = lti;
-                _active.append(lti);
-            }
-        }
-    }
-}
-
-void RegisterAllocator::linearScan()
-{
-    while (!_unhandled.isEmpty()) {
-        LifeTimeInterval *current = _unhandled.back();
-        _unhandled.pop_back();
-        const int position = current->start();
-
-        // check for intervals in active that are handled or inactive
-        for (int i = 0; i < _active.size(); ) {
-            LifeTimeInterval *it = _active.at(i);
-            if (it->end() < position) {
-                if (!it->isFixedInterval())
-                    _handled += it;
-                _active.remove(i);
-            } else if (!it->covers(position)) {
-                _inactive += it;
-                _active.remove(i);
-            } else {
-                ++i;
-            }
-        }
-
-        // check for intervals in inactive that are handled or active
-        for (int i = 0; i < _inactive.size(); ) {
-            LifeTimeInterval *it = _inactive.at(i);
-            if (it->end() < position) {
-                if (!it->isFixedInterval())
-                    _handled += it;
-                _inactive.remove(i);
-            } else if (it->covers(position)) {
-                if (it->reg() != LifeTimeInterval::InvalidRegister) {
-                    _active += it;
-                    _inactive.remove(i);
-                } else {
-                    // although this interval is now active, it has no register allocated (always
-                    // spilled), so leave it in inactive.
-                    ++i;
-                }
-            } else {
-                ++i;
-            }
-        }
-
-        Q_ASSERT(!current->isFixedInterval());
-
-#ifdef DEBUG_REGALLOC
-        qDebug() << "** Position" << position;
-#endif // DEBUG_REGALLOC
-
-        if (_info->canHaveRegister(current->temp())) {
-            tryAllocateFreeReg(*current);
-            if (current->reg() == LifeTimeInterval::InvalidRegister)
-                allocateBlockedReg(*current);
-            if (current->reg() != LifeTimeInterval::InvalidRegister)
-                _active += current;
-        } else {
-            assignSpillSlot(current->temp(), current->start(), current->end());
-            _inactive += current;
-            if (DebugRegAlloc)
-                qDebug() << "*** allocating stack slot" << _assignedSpillSlots[current->temp().index]
-                         << "for %" << current->temp().index << "as it cannot be loaded in a register";
-        }
-    }
-
-    for (LifeTimeInterval *r : qAsConst(_active))
-        if (!r->isFixedInterval())
-            _handled.append(r);
-    _active.clear();
-    for (LifeTimeInterval *r : qAsConst(_inactive))
-        if (!r->isFixedInterval())
-            _handled.append(r);
-    _inactive.clear();
-}
-
-static inline int indexOfRangeCoveringPosition(const LifeTimeInterval::Ranges &ranges, int position)
-{
-    for (int i = 0, ei = ranges.size(); i != ei; ++i) {
-        if (position <= ranges[i].end)
-            return i;
-    }
-    return -1;
-}
-
-static inline int intersectionPosition(const LifeTimeIntervalRange &one, const LifeTimeIntervalRange &two)
-{
-    if (one.covers(two.start))
-        return two.start;
-    if (two.covers(one.start))
-        return one.start;
-    return -1;
-}
-
-static inline bool isFP(const Temp &t)
-{ return t.type == DoubleType; }
-
-static inline bool candidateIsBetterFit(int bestSizeSoFar, int idealSize, int candidateSize)
-{
-    // If the candidateSize is larger than the current we take it only if the current size does not
-    // yet fit for the whole interval.
-    if (bestSizeSoFar < candidateSize && bestSizeSoFar < idealSize)
-        return true;
-
-    // If the candidateSize is smaller we only take it if it still fits the whole interval.
-    if (bestSizeSoFar > candidateSize && candidateSize >= idealSize)
-        return true;
-
-    // Other wise: no luck.
-    return false;
-}
-
-// Out of all available registers (with their next-uses), choose the one that fits the requested
-// duration best. This can return a register that is not free for the whole interval, but that's
-// fine: we just have to split the current interval.
-static void longestAvailableReg(int *nextUses, int nextUseCount, int &reg, int &freeUntilPos_reg, int lastUse)
-{
-    reg = LifeTimeInterval::InvalidRegister;
-    freeUntilPos_reg = 0;
-
-    for (int candidate = 0, candidateEnd = nextUseCount; candidate != candidateEnd; ++candidate) {
-        int fp = nextUses[candidate];
-        if (candidateIsBetterFit(freeUntilPos_reg, lastUse, fp)) {
-            reg = candidate;
-            freeUntilPos_reg = fp;
-        }
-    }
-}
-
-#define CALLOC_ON_STACK(ty, ptr, sz, val) \
-    Q_ASSERT(sz > 0); \
-    Q_ALLOCA_VAR(ty, ptr, sizeof(ty) * (sz)); \
-    for (ty *it = ptr, *eit = ptr + (sz); it != eit; ++it) \
-        *it = val;
-
-// Try to allocate a register that's currently free.
-void RegisterAllocator::tryAllocateFreeReg(LifeTimeInterval &current)
-{
-    Q_ASSERT(!current.isFixedInterval());
-    Q_ASSERT(current.reg() == LifeTimeInterval::InvalidRegister);
-
-    const bool needsFPReg = isFP(current.temp());
-    const int freeUntilPosCount = needsFPReg ? _fpRegisters.size() : _normalRegisters.size();
-    CALLOC_ON_STACK(int, freeUntilPos, freeUntilPosCount, INT_MAX);
-
-    for (Intervals::const_iterator i = _active.constBegin(), ei = _active.constEnd(); i != ei; ++i) {
-        const LifeTimeInterval *it = *i;
-        if (it->isFP() == needsFPReg)
-            freeUntilPos[it->reg()] = 0; // mark register as unavailable
-    }
-
-    for (Intervals::const_iterator i = _inactive.constBegin(), ei = _inactive.constEnd(); i != ei; ++i) {
-        const LifeTimeInterval *it = *i;
-        if (it->isFP() != needsFPReg)
-            continue; // different register type, so not applicable.
-        if (it->reg() == LifeTimeInterval::InvalidRegister)
-            continue; // this range does not block a register from being used, as it has no register assigned
-
-        if (current.isSplitFromInterval() || it->isFixedInterval()) {
-            const int intersectionPos = nextIntersection(current, *it);
-            if (intersectionPos != -1)
-                freeUntilPos[it->reg()] = qMin(freeUntilPos[it->reg()], intersectionPos);
-        }
-    }
-
-    int reg = LifeTimeInterval::InvalidRegister;
-    int freeUntilPos_reg = 0;
-
-    const RegAllocInfo::Hints &hints = _info->hints(current.temp());
-    for (RegAllocInfo::Hints::const_iterator i = hints.begin(), ei = hints.end(); i != ei; ++i) {
-        const Temp &hint = *i;
-        int candidate;
-        if (hint.kind == Temp::PhysicalRegister)
-            candidate = hint.index;
-        else
-            candidate = _lastAssignedRegister[hint.index];
-
-        const int end = current.end();
-        if (candidate == LifeTimeInterval::InvalidRegister)
-            continue; // the candidate has no register assigned, so it cannot be (re-)used
-        if (current.isFP() != isFP(hint))
-            continue;  // different register type, so not applicable.
-
-        const int fp = freeUntilPos[candidate];
-        if (candidateIsBetterFit(freeUntilPos_reg, end, fp)) {
-            reg = candidate;
-            freeUntilPos_reg = fp;
-        }
-    }
-
-    // None of the hinted registers could fit the interval, so try all registers next.
-    if (reg == LifeTimeInterval::InvalidRegister)
-        longestAvailableReg(freeUntilPos, freeUntilPosCount, reg, freeUntilPos_reg, current.end());
-
-    if (freeUntilPos_reg == 0) {
-        // no register available without spilling
-        if (DebugRegAlloc)
-            qDebug("*** no register available for %u", current.temp().index);
-        return;
-    } else if (current.end() < freeUntilPos_reg) {
-        // register available for the whole interval
-        if (DebugRegAlloc)
-            qDebug() << "*** allocating register" << reg << "for the whole interval of %" << current.temp().index;
-        current.setReg(reg);
-        _lastAssignedRegister[current.temp().index] = reg;
-        markInUse(reg, needsFPReg);
-    } else {
-        // register available for the first part of the interval
-
-        // TODO: this is slightly inefficient in the following case:
-        //   %1 = something
-        //   some_call(%1)
-        //   %2 = %1 + 1
-        // Now %1 will get a register assigned, and will be spilled to the stack immediately. It
-        // would be better to check if there are actually uses in the range before the split.
-
-        current.setReg(reg);
-        _lastAssignedRegister[current.temp().index] = reg;
-        if (DebugRegAlloc)
-            qDebug() << "*** allocating register" << reg << "for the first part of interval of %" << current.temp().index;
-        split(current, freeUntilPos_reg, true);
-        markInUse(reg, needsFPReg);
-    }
-}
-
-// This gets called when all registers are currently in use.
-void RegisterAllocator::allocateBlockedReg(LifeTimeInterval &current)
-{
-    Q_ASSERT(!current.isFixedInterval());
-    Q_ASSERT(current.reg() == LifeTimeInterval::InvalidRegister);
-    const int position = current.start();
-
-    const bool isPhiTarget = _info->isPhiTarget(current.temp());
-    if (isPhiTarget && !current.isSplitFromInterval()) {
-        // Special case: storing to a phi-node's target will result in a single move. So, if we
-        // would spill another interval to the stack (that's 1 store), and then do the move for the
-        // phi target (at least 1 move or a load), that would result in 2 instructions. Instead, we
-        // force the phi-node's target to go to the stack immediately, which is always a single
-        // store.
-        split(current, position + 1, true);
-        _inactive.append(&current);
-        return;
-    }
-
-    const bool needsFPReg = isFP(current.temp());
-    const int nextUsePosCount = needsFPReg ? _fpRegisters.size() : _normalRegisters.size();
-    CALLOC_ON_STACK(int, nextUsePos, nextUsePosCount, INT_MAX);
-    QVector<LifeTimeInterval *> nextUseRangeForReg(nextUsePosCount, 0);
-
-    for (Intervals::const_iterator i = _active.constBegin(), ei = _active.constEnd(); i != ei; ++i) {
-        LifeTimeInterval &it = **i;
-        if (it.isFP() != needsFPReg)
-            continue; // different register type, so not applicable.
-
-        const int nu = it.isFixedInterval() ? 0 : nextUse(it.temp(), current.start());
-        if (nu == position) {
-            nextUsePos[it.reg()] = 0;
-        } else if (nu != -1 && nu < nextUsePos[it.reg()]) {
-            nextUsePos[it.reg()] = nu;
-            nextUseRangeForReg[it.reg()] = &it;
-        } else if (nu == -1 && nextUsePos[it.reg()] == INT_MAX) {
-            // in a loop, the range can be active, but the result might only be used before the
-            // current position (e.g. the induction variable being used in the phi node in the loop
-            // header). So, we can use this register, but we need to remember to split the interval
-            // in order to have the edge-resolving generate a load at the edge going back to the
-            // loop header.
-            nextUseRangeForReg[it.reg()] = &it;
-        }
-    }
-
-    for (Intervals::const_iterator i = _inactive.constBegin(), ei = _inactive.constEnd(); i != ei; ++i) {
-        LifeTimeInterval &it = **i;
-        if (it.isFP() != needsFPReg)
-            continue; // different register type, so not applicable.
-        if (it.reg() == LifeTimeInterval::InvalidRegister)
-            continue; // this range does not block a register from being used, as it has no register assigned
-
-        if (current.isSplitFromInterval() || it.isFixedInterval()) {
-            if (nextIntersection(current, it) != -1) {
-                const int nu = nextUse(it.temp(), current.start());
-                if (nu != -1 && nu < nextUsePos[it.reg()]) {
-                    nextUsePos[it.reg()] = nu;
-                    nextUseRangeForReg[it.reg()] = &it;
-                }
-            }
-        }
-    }
-
-    int reg, nextUsePos_reg;
-    longestAvailableReg(nextUsePos, nextUsePosCount, reg, nextUsePos_reg, current.end());
-
-    Q_ASSERT(current.start() <= nextUsePos_reg);
-
-    // spill interval that currently block reg
-    if (DebugRegAlloc) {
-        QBuffer buf;
-        buf.open(QIODevice::WriteOnly);
-        QTextStream out(&buf);
-        out << "*** spilling intervals that block reg " <<reg<< " for interval ";
-        current.dump(out);
-        qDebug("%s", buf.data().constData());
-    }
-    current.setReg(reg);
-    _lastAssignedRegister[current.temp().index] = reg;
-    LifeTimeInterval *nextUse = nextUseRangeForReg[reg];
-    Q_ASSERT(nextUse);
-    Q_ASSERT(!nextUse->isFixedInterval());
-
-    split(*nextUse, position, /*skipOptionalRegisterUses =*/ true);
-
-    // We might have chosen a register that is used by a range that has a hole in its life time.
-    // If that's the case, check if the current interval completely fits in the hole. Or rephrased:
-    // check if the current interval will use the register after that hole ends (so that range, and
-    // if so, split that interval so that it gets a new register assigned when it needs one.
-    splitInactiveAtEndOfLifetimeHole(reg, needsFPReg, position);
-
-    // make sure that current does not intersect with the fixed interval for reg
-    const LifeTimeInterval *fixedRegRange = needsFPReg ? _fixedFPRegisterRanges.at(reg)
-                                                       : _fixedRegisterRanges.at(reg);
-    if (fixedRegRange) {
-        int ni = nextIntersection(current, *fixedRegRange);
-        if (ni != -1) {
-            if (DebugRegAlloc) {
-                qDebug("***-- current range intersects with a fixed reg use at %d, so splitting it.", ni);
-            }
-            // current does overlap with a fixed interval, so split current before that intersection.
-            split(current, ni, true);
-        }
-    }
-}
-
-int RegisterAllocator::nextIntersection(const LifeTimeInterval &current,
-                                        const LifeTimeInterval &another) const
-{
-    const LifeTimeInterval::Ranges &currentRanges = current.ranges();
-    int currentIt = 0;
-
-    const LifeTimeInterval::Ranges &anotherRanges = another.ranges();
-    const int anotherItStart = indexOfRangeCoveringPosition(anotherRanges, current.start());
-    if (anotherItStart == -1)
-        return -1;
-
-    for (int currentEnd = currentRanges.size(); currentIt < currentEnd; ++currentIt) {
-        const LifeTimeIntervalRange currentRange = currentRanges.at(currentIt);
-        for (int anotherIt = anotherItStart, anotherEnd = anotherRanges.size(); anotherIt < anotherEnd; ++anotherIt) {
-            const LifeTimeIntervalRange anotherRange = anotherRanges.at(anotherIt);
-            if (anotherRange.start > currentRange.end)
-                break;
-            int intersectPos = intersectionPosition(currentRange, anotherRange);
-            if (intersectPos != -1)
-                return intersectPos;
-        }
-    }
-
-    return -1;
-}
-
-/// Find the first use after the start position for the given temp.
-///
-/// This is only called when all registers are in use, and when one of them has to be spilled to the
-/// stack. So, uses where a register is optional can be ignored.
-int RegisterAllocator::nextUse(const Temp &t, int startPosition) const
-{
-    typedef std::vector<Use>::const_iterator ConstIt;
-
-    const std::vector<Use> &usePositions = _info->uses(t);
-    const ConstIt cend = usePositions.end();
-    for (ConstIt it = usePositions.begin(); it != cend; ++it) {
-        if (it->mustHaveRegister()) {
-            const int usePos = it->pos;
-            if (usePos >= startPosition)
-                return usePos;
-        }
-    }
-
-    return -1;
-}
-
-static inline void insertReverseSorted(QVector<LifeTimeInterval *> &intervals, LifeTimeInterval *newInterval)
-{
-    newInterval->validate();
-    for (int i = intervals.size(); i > 0;) {
-        if (LifeTimeInterval::lessThan(newInterval, intervals.at(--i))) {
-            intervals.insert(i + 1, newInterval);
-            return;
-        }
-    }
-    intervals.insert(0, newInterval);
-}
-
-void RegisterAllocator::split(LifeTimeInterval &current, int beforePosition,
-                              bool skipOptionalRegisterUses)
-{ // TODO: check if we can always skip the optional register uses
-    Q_ASSERT(!current.isFixedInterval());
-
-    if (DebugRegAlloc) {
-        QBuffer buf;
-        buf.open(QIODevice::WriteOnly);
-        QTextStream out(&buf);
-        out << "***** split request for range ";
-        current.dump(out);
-        out << " before position " << beforePosition
-            << " and skipOptionalRegisterUses = " << skipOptionalRegisterUses << endl;
-        qDebug("%s", buf.data().constData());
-    }
-
-    assignSpillSlot(current.temp(), current.start(), current.end());
-
-    const int firstPosition = current.start();
-    Q_ASSERT(beforePosition > firstPosition && "split before start");
-
-    int lastUse = firstPosition;
-    int nextUse = -1;
-    const std::vector<Use> &usePositions = _info->uses(current.temp());
-    for (size_t i = 0, ei = usePositions.size(); i != ei; ++i) {
-        const Use &usePosition = usePositions.at(i);
-        const int usePos = usePosition.pos;
-        if (lastUse < usePos && usePos < beforePosition) {
-            lastUse = usePos;
-        } else if (usePos >= beforePosition) {
-            if (!skipOptionalRegisterUses || usePosition.mustHaveRegister()) {
-                nextUse = usePos;
-                break;
-            }
-        }
-    }
-    Q_ASSERT(lastUse != -1);
-    Q_ASSERT(lastUse < beforePosition);
-
-    LifeTimeInterval newInterval = current.split(lastUse, nextUse);
-    if (DebugRegAlloc) {
-        QBuffer buf;
-        buf.open(QIODevice::WriteOnly);
-        QTextStream out(&buf);
-        out << "***** last use = " << lastUse << ", nextUse = " << nextUse << endl;
-        out << "***** new interval: ";
-        newInterval.dump(out);
-        out << endl;
-        out << "***** preceding interval: ";
-        current.dump(out);
-        out << endl;
-        qDebug("%s", buf.data().constData());
-    }
-    if (newInterval.isValid()) {
-        if (current.reg() != LifeTimeInterval::InvalidRegister)
-            _info->addHint(current.temp(), current.reg());
-        newInterval.setReg(LifeTimeInterval::InvalidRegister);
-        LifeTimeInterval *newIntervalPtr = new LifeTimeInterval(newInterval);
-        _lifeTimeIntervals->add(newIntervalPtr);
-        insertReverseSorted(_unhandled, newIntervalPtr);
-    }
-}
-
-void RegisterAllocator::splitInactiveAtEndOfLifetimeHole(int reg, bool isFPReg, int position)
-{
-    for (int i = 0, ei = _inactive.size(); i != ei; ++i) {
-        LifeTimeInterval &interval = *_inactive[i];
-        if (interval.isFixedInterval())
-            continue;
-        if (isFPReg == interval.isFP() && interval.reg() == reg) {
-            LifeTimeInterval::Ranges ranges = interval.ranges();
-            int endOfLifetimeHole = -1;
-            for (int j = 0, ej = ranges.size(); j != ej; ++j) {
-                if (position < ranges[j].start)
-                    endOfLifetimeHole = ranges[j].start;
-            }
-            if (endOfLifetimeHole != -1)
-                split(interval, endOfLifetimeHole);
-        }
-    }
-}
-
-void RegisterAllocator::assignSpillSlot(const Temp &t, int startPos, int endPos)
-{
-    if (_assignedSpillSlots[t.index] != InvalidSpillSlot)
-        return;
-
-    for (int i = 0, ei = _activeSpillSlots.size(); i != ei; ++i) {
-        if (_activeSpillSlots.at(i) < startPos) {
-            _activeSpillSlots[i] = endPos;
-            _assignedSpillSlots[t.index] = i;
-            return;
-        }
-    }
-
-    Q_UNREACHABLE();
-}
-
-void RegisterAllocator::dump(IR::Function *function) const
-{
-    QBuffer buf;
-    buf.open(QIODevice::WriteOnly);
-    QTextStream qout(&buf);
-    IRPrinterWithPositions printer(&qout, _lifeTimeIntervals);
-
-    qout << "Ranges:" << endl;
-    QVector<LifeTimeInterval *> handled = _handled;
-    std::sort(handled.begin(), handled.end(), LifeTimeInterval::lessThanForTemp);
-    for (const LifeTimeInterval *r : qAsConst(handled)) {
-        r->dump(qout);
-        qout << endl;
-    }
-
-    qout << "Spill slots:" << endl;
-    for (unsigned i = 0; i < _assignedSpillSlots.size(); ++i)
-        if (_assignedSpillSlots[i] != InvalidSpillSlot)
-            qout << "\t%" << i << " -> " << _assignedSpillSlots[i] << endl;
-
-    printer.print(function);
-    qDebug("%s", buf.data().constData());
-}
-
-// References:
-//  [Wimmer1] C. Wimmer and M. Franz. Linear Scan Register Allocation on SSA Form. In Proceedings of
-//            CGO'10, ACM Press, 2010
-//  [Wimmer2] C. Wimmer and H. Mossenbock. Optimized Interval Splitting in a Linear Scan Register
-//            Allocator. In Proceedings of the ACM/USENIX International Conference on Virtual
-//            Execution Environments, pages 132-141. ACM Press, 2005.
-//  [Traub]   Omri Traub, Glenn Holloway, and Michael D. Smith. Quality and Speed in Linear-scan
-//            Register Allocation. In Proceedings of the ACM SIGPLAN 1998 Conference on Programming
-//            Language Design and Implementation, pages 142-151, June 1998.
diff --git a/src/qml/jit/qv4regalloc_p.h b/src/qml/jit/qv4regalloc_p.h
deleted file mode 100644
index 4ee440b73e..0000000000
--- a/src/qml/jit/qv4regalloc_p.h
+++ /dev/null
@@ -1,140 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the V4VM module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-#ifndef QV4REGALLOC_P_H
-#define QV4REGALLOC_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include "qv4global_p.h"
-#include "qv4isel_p.h"
-#include "qv4ssa_p.h"
-#include "qv4registerinfo_p.h"
-
-#include <config.h>
-
-QT_BEGIN_NAMESPACE
-
-namespace QV4 {
-namespace JIT {
-
-class RegAllocInfo;
-
-// This class implements a linear-scan register allocator, with a couple of tweaks:
-//  - Second-chance allocation is used when an interval becomes active after a spill, which results
-//    in fewer differences between edges, and hence fewer moves before jumps.
-//  - Use positions are flagged with either "must have" register or "could have" register. This is
-//    used to decide whether a register is really needed when a temporary is used after a spill
-//    occurred.
-//  - Fixed intervals are used to denotate IR positions where certain registers are needed in order
-//    to implement the operation, and cannot be used by a temporary on that position. An example is
-//    caller saved registers, where the call will use/clobber those registers.
-//  - Hints are used to indicate which registers could be used to generate more compact code. An
-//    example is an addition, where one (or both) operands' life-time ends at that instruction. In
-//    this case, re-using an operand register for the result will result in an in-place add.
-//  - SSA form properties are used:
-//      - to simplify life-times (two temporaries will never interfere as long as their intervals
-//        are not split), resulting in a slightly faster algorithm;
-//      - when a temporary needs to be spilled, it is done directly after calculating it, so that
-//        1 store is generated even if multiple spills/splits happen.
-//      - phi-node elimination (SSA form deconstruction) is done when resolving differences between
-//        CFG edges
-class RegisterAllocator
-{
-    typedef IR::LifeTimeInterval LifeTimeInterval;
-
-    const RegisterInformation &_registerInformation;
-    QVector<const RegisterInfo *> _normalRegisters;
-    QVector<const RegisterInfo *> _fpRegisters;
-    QScopedPointer<RegAllocInfo> _info;
-
-    QVector<LifeTimeInterval *> _fixedRegisterRanges, _fixedFPRegisterRanges;
-
-    IR::LifeTimeIntervals::Ptr _lifeTimeIntervals;
-    typedef QVector<LifeTimeInterval *> Intervals;
-    Intervals _unhandled, _active, _inactive, _handled;
-
-    std::vector<int> _lastAssignedRegister;
-    std::vector<int> _assignedSpillSlots;
-    QVector<int> _activeSpillSlots;
-
-    QBitArray _regularRegsInUse, _fpRegsInUse;
-
-    Q_DISABLE_COPY(RegisterAllocator)
-
-public:
-    enum { InvalidSpillSlot = -1 };
-
-    RegisterAllocator(const RegisterInformation &registerInformation);
-    ~RegisterAllocator();
-
-    void run(IR::Function *function, const IR::Optimizer &opt);
-    RegisterInformation usedRegisters() const;
-
-private:
-    void markInUse(int reg, bool isFPReg);
-    LifeTimeInterval *cloneFixedInterval(int reg, bool isFP, const LifeTimeInterval &original);
-    void prepareRanges();
-    void linearScan();
-    void tryAllocateFreeReg(LifeTimeInterval &current);
-    void allocateBlockedReg(LifeTimeInterval &current);
-    int nextIntersection(const LifeTimeInterval &current, const LifeTimeInterval &another) const;
-    int nextUse(const IR::Temp &t, int startPosition) const;
-    void split(LifeTimeInterval &current, int beforePosition, bool skipOptionalRegisterUses =false);
-    void splitInactiveAtEndOfLifetimeHole(int reg, bool isFPReg, int position);
-    void assignSpillSlot(const IR::Temp &t, int startPos, int endPos);
-    void resolve(IR::Function *function, const IR::Optimizer &opt);
-
-    void dump(IR::Function *function) const;
-};
-
-} // end of namespace JIT
-} // end of namespace QV4
-
-QT_END_NAMESPACE
-
-#endif // QV4REGALLOC_P_H
diff --git a/src/qml/jit/qv4registerinfo_p.h b/src/qml/jit/qv4registerinfo_p.h
deleted file mode 100644
index 214206db91..0000000000
--- a/src/qml/jit/qv4registerinfo_p.h
+++ /dev/null
@@ -1,112 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QV4REGISTERINFO_P_H
-#define QV4REGISTERINFO_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include <QtCore/QString>
-
-QT_BEGIN_NAMESPACE
-
-namespace QV4 {
-namespace JIT {
-
-class RegisterInfo
-{
-public:
-    enum { InvalidRegister = (1 << 29) - 1 };
-    enum SavedBy { CallerSaved, CalleeSaved };
-    enum RegisterType { RegularRegister, FloatingPointRegister };
-    enum Usage { Predefined, RegAlloc };
-
-public:
-    RegisterInfo()
-        : _savedBy(CallerSaved)
-        , _usage(Predefined)
-        , _type(RegularRegister)
-        , _reg(InvalidRegister)
-    {}
-
-    RegisterInfo(int reg, const QString &prettyName, RegisterType type, SavedBy savedBy, Usage usage)
-        : _prettyName(prettyName)
-        , _savedBy(savedBy)
-        , _usage(usage)
-        , _type(type)
-        , _reg(reg)
-    {}
-
-    bool operator==(const RegisterInfo &other) const
-    { return _type == other._type && _reg == other._reg; }
-
-    bool isValid() const { return _reg != InvalidRegister; }
-    template <typename T> T reg() const { return static_cast<T>(_reg); }
-    QString prettyName() const { return _prettyName; }
-    bool isCallerSaved() const { return _savedBy == CallerSaved; }
-    bool isCalleeSaved() const { return _savedBy == CalleeSaved; }
-    bool isFloatingPoint() const { return _type == FloatingPointRegister; }
-    bool isRegularRegister() const { return _type == RegularRegister; }
-    bool useForRegAlloc() const { return _usage == RegAlloc; }
-    bool isPredefined() const { return _usage == Predefined; }
-
-private:
-    QString _prettyName;
-    unsigned _savedBy : 1;
-    unsigned _usage   : 1;
-    unsigned _type    : 1;
-    unsigned _reg     : 29;
-};
-typedef QVector<RegisterInfo> RegisterInformation;
-
-} // JIT namespace
-} // QV4 namespace
-
-QT_END_NAMESPACE
-
-#endif // QV4REGISTERINFO_P_H
diff --git a/src/qml/jit/qv4targetplatform_p.h b/src/qml/jit/qv4targetplatform_p.h
deleted file mode 100644
index 6d788f4a93..0000000000
--- a/src/qml/jit/qv4targetplatform_p.h
+++ /dev/null
@@ -1,707 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QV4TARGETPLATFORM_P_H
-#define QV4TARGETPLATFORM_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include <config.h>
-
-#if ENABLE(ASSEMBLER)
-
-#include <private/qv4value_p.h>
-#include "qv4registerinfo_p.h"
-#include <assembler/MacroAssembler.h>
-
-QT_BEGIN_NAMESPACE
-
-namespace QV4 {
-namespace JIT {
-
-enum TargetOperatingSystemSpecialization {
-    NoOperatingSystemSpecialization,
-    WindowsSpecialization
-};
-
-// The TargetPlatform class describes how the stack and the registers work on a CPU+ABI combination.
-//
-// All combinations have a separate definition, guarded by #ifdefs. The exceptions are:
-//  - Linux/x86 and win32, which are the same, except that linux non-PIC/PIE code does not need to
-//    restore ebx (which holds the GOT ptr) before a call
-//  - All (supported) ARM platforms, where the only variety is the platform specific usage of r9,
-//    and the frame-pointer in Thumb/Thumb2 v.s. ARM mode.
-//
-// Specific handling of ebx when it holds the GOT:
-// In this case we can use it, but it needs to be restored when doing a call. So, the handling is as
-// follows: it is marked as caller saved, meaning the value in it won't survive a call. When
-// calculating the list of callee saved registers in getCalleeSavedRegisters (which is used to
-// generate push/pop instructions in the prelude/postlude), we add ebx too. Then when synthesizing
-// a call, we add a load it right before emitting the call instruction.
-//
-// NOTE: When adding new architecture, do not forget to whitelist it in qv4global_p.h!
-template <typename PlatformAssembler, TargetOperatingSystemSpecialization specialization = NoOperatingSystemSpecialization>
-class TargetPlatform
-{
-};
-
-#if CPU(X86) && (OS(LINUX) || OS(WINDOWS) || OS(QNX) || OS(FREEBSD) || defined(Q_OS_IOS))
-template <>
-class TargetPlatform<JSC::MacroAssemblerX86, NoOperatingSystemSpecialization>
-{
-public:
-    using PlatformAssembler = JSC::MacroAssemblerX86;
-    using RegisterID = PlatformAssembler::RegisterID;
-    using FPRegisterID = PlatformAssembler::FPRegisterID;
-    using TrustedImm32 = PlatformAssembler::TrustedImm32;
-
-    enum { RegAllocIsSupported = 1 };
-
-    static const RegisterID FramePointerRegister   = JSC::X86Registers::ebp;
-    static const RegisterID StackPointerRegister = JSC::X86Registers::esp;
-    static const RegisterID LocalsRegister       = JSC::X86Registers::edi;
-    static const RegisterID EngineRegister      = JSC::X86Registers::esi;
-    static const RegisterID ReturnValueRegister  = JSC::X86Registers::eax;
-    static const RegisterID ScratchRegister      = JSC::X86Registers::ecx;
-    static const FPRegisterID FPGpr0             = JSC::X86Registers::xmm0;
-    static const FPRegisterID FPGpr1             = JSC::X86Registers::xmm1;
-    static const RegisterID LowReturnValueRegister = JSC::X86Registers::eax;
-    static const RegisterID HighReturnValueRegister = JSC::X86Registers::edx;
-
-    static RegisterInformation getRegisterInfo()
-    {
-        typedef RegisterInfo RI;
-        static RegisterInformation info = RegisterInformation()
-                << RI(JSC::X86Registers::edx, QStringLiteral("edx"),   RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::ebx, QStringLiteral("ebx"),   RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::edi, QStringLiteral("edi"),   RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::X86Registers::esi, QStringLiteral("esi"),   RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::X86Registers::xmm2, QStringLiteral("xmm2"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm3, QStringLiteral("xmm3"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm4, QStringLiteral("xmm4"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm5, QStringLiteral("xmm5"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm6, QStringLiteral("xmm6"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm7, QStringLiteral("xmm7"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                   ;
-        return info;
-    }
-
-#  define HAVE_ALU_OPS_WITH_MEM_OPERAND 1
-    static const int RegisterSize = 4;
-
-    static const int RegisterArgumentCount = 0;
-    static RegisterID registerForArgument(int) { Q_UNREACHABLE(); }
-
-    static const int StackAlignment = 16;
-    static const int StackShadowSpace = 0;
-    static const int StackSpaceAllocatedUponFunctionEntry = RegisterSize; // Return address is pushed onto stack by the CPU.
-    static void platformEnterStandardStackFrame(PlatformAssembler *as) { as->push(FramePointerRegister); }
-    static void platformFinishEnteringStandardStackFrame(PlatformAssembler *) {}
-    static void platformLeaveStandardStackFrame(PlatformAssembler *as, int frameSize)
-    {
-        if (frameSize > 0)
-            as->add32(TrustedImm32(frameSize), StackPointerRegister);
-        as->pop(FramePointerRegister);
-    }
-
-#if OS(WINDOWS) || OS(QNX) || \
-    ((OS(LINUX) || OS(FREEBSD)) && (defined(__PIC__) || defined(__PIE__)))
-
-    static const int gotRegister = JSC::X86Registers::ebx;
-    static int savedGOTRegisterSlotOnStack() {
-        static int ebxIdx = -1;
-        if (ebxIdx == -1) {
-            int calleeSaves = 0;
-            const auto infos = getRegisterInfo();
-            for (const RegisterInfo &info : infos) {
-                if (info.reg<JSC::X86Registers::RegisterID>() == JSC::X86Registers::ebx) {
-                    ebxIdx = calleeSaves;
-                    break;
-                } else if (info.isCalleeSaved()) {
-                    ++calleeSaves;
-                }
-            }
-            Q_ASSERT(ebxIdx >= 0);
-            ebxIdx += 1;
-        }
-        return ebxIdx * -int(sizeof(void*));
-    }
-#else
-    static const int gotRegister = -1;
-    static int savedGOTRegisterSlotOnStack() { return -1; }
-#endif
-};
-#endif // x86
-
-#if CPU(X86_64) && (OS(LINUX) || OS(MAC_OS_X) || OS(FREEBSD) || OS(QNX) || defined(Q_OS_IOS))
-template <>
-class TargetPlatform<JSC::MacroAssemblerX86_64, NoOperatingSystemSpecialization>
-{
-public:
-    using PlatformAssembler = JSC::MacroAssemblerX86_64;
-    using RegisterID = PlatformAssembler::RegisterID;
-    using FPRegisterID = PlatformAssembler::FPRegisterID;
-    using TrustedImm32 = PlatformAssembler::TrustedImm32;
-
-    enum { RegAllocIsSupported = 1 };
-
-    static const RegisterID FramePointerRegister   = JSC::X86Registers::ebp;
-    static const RegisterID StackPointerRegister = JSC::X86Registers::esp;
-    static const RegisterID LocalsRegister       = JSC::X86Registers::r12;
-    static const RegisterID EngineRegister      = JSC::X86Registers::r14;
-    static const RegisterID ReturnValueRegister  = JSC::X86Registers::eax;
-    static const RegisterID ScratchRegister      = JSC::X86Registers::r10;
-    static const RegisterID DoubleMaskRegister   = JSC::X86Registers::r13;
-    static const FPRegisterID FPGpr0             = JSC::X86Registers::xmm0;
-    static const FPRegisterID FPGpr1             = JSC::X86Registers::xmm1;
-
-    static RegisterInformation getRegisterInfo()
-    {
-        typedef RegisterInfo RI;
-        static RegisterInformation info = RegisterInformation()
-                << RI(JSC::X86Registers::ebx,  QStringLiteral("rbx"),  RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::edi,  QStringLiteral("rdi"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::esi,  QStringLiteral("rsi"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::edx,  QStringLiteral("rdx"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::r9,   QStringLiteral("r9"),   RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::r8,   QStringLiteral("r8"),   RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                   // r11 is used as scratch register by the macro assembler
-                << RI(JSC::X86Registers::r12,  QStringLiteral("r12"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::X86Registers::r13,  QStringLiteral("r13"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::X86Registers::r14,  QStringLiteral("r14"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::X86Registers::r15,  QStringLiteral("r15"),  RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm2, QStringLiteral("xmm2"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm3, QStringLiteral("xmm3"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm4, QStringLiteral("xmm4"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm5, QStringLiteral("xmm5"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm6, QStringLiteral("xmm6"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm7, QStringLiteral("xmm7"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                   ;
-        return info;
-    }
-
-#define HAVE_ALU_OPS_WITH_MEM_OPERAND 1
-    static const int RegisterSize = 8;
-
-    static const int RegisterArgumentCount = 6;
-    static RegisterID registerForArgument(int index)
-    {
-        static RegisterID regs[RegisterArgumentCount] = {
-            JSC::X86Registers::edi,
-            JSC::X86Registers::esi,
-            JSC::X86Registers::edx,
-            JSC::X86Registers::ecx,
-            JSC::X86Registers::r8,
-            JSC::X86Registers::r9
-        };
-        Q_ASSERT(index >= 0 && index < RegisterArgumentCount);
-        return regs[index];
-    };
-
-    static const int StackAlignment = 16;
-    static const int StackShadowSpace = 0;
-    static const int StackSpaceAllocatedUponFunctionEntry = RegisterSize; // Return address is pushed onto stack by the CPU.
-    static void platformEnterStandardStackFrame(PlatformAssembler *as) { as->push(FramePointerRegister); }
-    static void platformFinishEnteringStandardStackFrame(PlatformAssembler *as)
-    {
-        as->move(PlatformAssembler::TrustedImm64(QV4::Value::NaNEncodeMask), DoubleMaskRegister);
-    }
-    static void platformLeaveStandardStackFrame(PlatformAssembler *as, int frameSize)
-    {
-        if (frameSize > 0)
-            as->add64(TrustedImm32(frameSize), StackPointerRegister);
-        as->pop(FramePointerRegister);
-    }
-
-    static const int gotRegister = -1;
-    static int savedGOTRegisterSlotOnStack() { return -1; }
-};
-#endif // Linux/MacOS on x86_64
-
-#if CPU(X86_64) && OS(WINDOWS)
-template <>
-class TargetPlatform<JSC::MacroAssemblerX86_64, WindowsSpecialization>
-{
-public:
-    using PlatformAssembler = JSC::MacroAssemblerX86_64;
-    using RegisterID = PlatformAssembler::RegisterID;
-    using FPRegisterID = PlatformAssembler::FPRegisterID;
-    using TrustedImm32 = PlatformAssembler::TrustedImm32;
-
-    enum { RegAllocIsSupported = 1 };
-
-    static const RegisterID FramePointerRegister   = JSC::X86Registers::ebp;
-    static const RegisterID StackPointerRegister = JSC::X86Registers::esp;
-    static const RegisterID LocalsRegister       = JSC::X86Registers::r12;
-    static const RegisterID EngineRegister      = JSC::X86Registers::r14;
-    static const RegisterID ReturnValueRegister  = JSC::X86Registers::eax;
-    static const RegisterID ScratchRegister      = JSC::X86Registers::r10;
-    static const RegisterID DoubleMaskRegister   = JSC::X86Registers::r13;
-    static const FPRegisterID FPGpr0             = JSC::X86Registers::xmm0;
-    static const FPRegisterID FPGpr1             = JSC::X86Registers::xmm1;
-
-    static RegisterInformation getRegisterInfo()
-    {
-        typedef RegisterInfo RI;
-        static RegisterInformation info = RegisterInformation()
-                << RI(JSC::X86Registers::ebx,  QStringLiteral("rbx"),  RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::edi,  QStringLiteral("rdi"),  RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::esi,  QStringLiteral("rsi"),  RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::edx,  QStringLiteral("rdx"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::r8,   QStringLiteral("r8"),   RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::r9,   QStringLiteral("r9"),   RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                   // r11 is used as scratch register by the macro assembler
-                << RI(JSC::X86Registers::r12,  QStringLiteral("r12"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::X86Registers::r13,  QStringLiteral("r13"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::X86Registers::r14,  QStringLiteral("r14"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::X86Registers::r15,  QStringLiteral("r15"),  RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm2, QStringLiteral("xmm2"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm3, QStringLiteral("xmm3"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm4, QStringLiteral("xmm4"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm5, QStringLiteral("xmm5"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm6, QStringLiteral("xmm6"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::X86Registers::xmm7, QStringLiteral("xmm7"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                   ;
-        return info;
-    }
-
-#define HAVE_ALU_OPS_WITH_MEM_OPERAND 1
-    static const int RegisterSize = 8;
-
-    static const int RegisterArgumentCount = 4;
-    static RegisterID registerForArgument(int index)
-    {
-        static RegisterID regs[RegisterArgumentCount] = {
-            JSC::X86Registers::ecx,
-            JSC::X86Registers::edx,
-            JSC::X86Registers::r8,
-            JSC::X86Registers::r9
-        };
-        Q_ASSERT(index >= 0 && index < RegisterArgumentCount);
-        return regs[index];
-    }
-
-    static const int StackAlignment = 16;
-    static const int StackShadowSpace = 32;
-    static const int StackSpaceAllocatedUponFunctionEntry = RegisterSize; // Return address is pushed onto stack by the CPU.
-    static void platformEnterStandardStackFrame(PlatformAssembler *as) { as->push(FramePointerRegister); }
-    static void platformFinishEnteringStandardStackFrame(PlatformAssembler *as)
-    {
-        as->move(PlatformAssembler::TrustedImm64(QV4::Value::NaNEncodeMask), DoubleMaskRegister);
-    }
-    static void platformLeaveStandardStackFrame(PlatformAssembler *as, int frameSize)
-    {
-        if (frameSize > 0)
-            as->add64(TrustedImm32(frameSize), StackPointerRegister);
-        as->pop(FramePointerRegister);
-    }
-
-    static const int gotRegister = -1;
-    static int savedGOTRegisterSlotOnStack() { return -1; }
-};
-#endif // Windows on x86_64
-
-#if CPU(ARM) || defined(V4_BOOTSTRAP)
-template <>
-class TargetPlatform<JSC::MacroAssemblerARMv7, NoOperatingSystemSpecialization>
-{
-public:
-    using PlatformAssembler = JSC::MacroAssemblerARMv7;
-    using RegisterID = PlatformAssembler::RegisterID;
-    using FPRegisterID = PlatformAssembler::FPRegisterID;
-    using TrustedImm32 = PlatformAssembler::TrustedImm32;
-
-    enum { RegAllocIsSupported = 1 };
-
-    // The AAPCS specifies that the platform ABI has to define the usage of r9. Known are:
-    //  - The GNU/Linux ABI defines it as an additional callee-saved variable register (v6).
-    //  - iOS (for which we cannot JIT, but still...) defines it as having a special use, so we do
-    //    not touch it, nor use it.
-    //  - Any other platform has not been verified, so we conservatively assume we cannot use it.
-#if OS(LINUX)
-#define CAN_USE_R9
-#endif
-
-    // There are two designated frame-pointer registers on ARM, depending on which instruction set
-    // is used for the subroutine: r7 for Thumb or Thumb2, and r11 for ARM. We assign the constants
-    // accordingly, and assign the locals-register to the "other" register.
-#if CPU(ARM_THUMB2) || defined(V4_BOOTSTRAP)
-    static const RegisterID FramePointerRegister = JSC::ARMRegisters::r7;
-    static const RegisterID LocalsRegister = JSC::ARMRegisters::r11;
-#else // Thumbs down
-    static const RegisterID FramePointerRegister = JSC::ARMRegisters::r11;
-    static const RegisterID LocalsRegister = JSC::ARMRegisters::r7;
-#endif
-    static const RegisterID StackPointerRegister = JSC::ARMRegisters::r13;
-    static const RegisterID ScratchRegister = JSC::ARMRegisters::r5;
-    static const RegisterID EngineRegister = JSC::ARMRegisters::r10;
-    static const RegisterID ReturnValueRegister = JSC::ARMRegisters::r0;
-    static const FPRegisterID FPGpr0 = JSC::ARMRegisters::d0;
-    static const FPRegisterID FPGpr1 = JSC::ARMRegisters::d1;
-    static const RegisterID LowReturnValueRegister = JSC::ARMRegisters::r0;
-    static const RegisterID HighReturnValueRegister = JSC::ARMRegisters::r1;
-
-    static RegisterInformation getRegisterInfo()
-    {
-        typedef RegisterInfo RI;
-        static RegisterInformation info = RegisterInformation()
-                << RI(JSC::ARMRegisters::r0,  QStringLiteral("r0"),  RI::RegularRegister,       RI::CallerSaved, RI::Predefined)
-                << RI(JSC::ARMRegisters::r1,  QStringLiteral("r1"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::r2,  QStringLiteral("r2"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::r3,  QStringLiteral("r3"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::r4,  QStringLiteral("r4"),  RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::r5,  QStringLiteral("r5"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::ARMRegisters::r6,  QStringLiteral("r6"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-#if !CPU(ARM_THUMB2) && !defined(V4_BOOTSTRAP)
-                << RI(JSC::ARMRegisters::r7,  QStringLiteral("r7"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-#endif
-                << RI(JSC::ARMRegisters::r8,  QStringLiteral("r8"),  RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-#ifdef CAN_USE_R9
-                << RI(JSC::ARMRegisters::r9,  QStringLiteral("r9"),  RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-#endif
-                << RI(JSC::ARMRegisters::r10, QStringLiteral("r10"), RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-#if CPU(ARM_THUMB2) || defined(V4_BOOTSTRAP)
-                << RI(JSC::ARMRegisters::r11, QStringLiteral("r11"), RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-#endif
-                << RI(JSC::ARMRegisters::d2,  QStringLiteral("d2"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d3,  QStringLiteral("d3"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d4,  QStringLiteral("d4"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d5,  QStringLiteral("d5"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d6,  QStringLiteral("d6"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d8,  QStringLiteral("d8"),  RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d9,  QStringLiteral("d9"),  RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d10, QStringLiteral("d10"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d11, QStringLiteral("d11"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d12, QStringLiteral("d12"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d13, QStringLiteral("d13"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d14, QStringLiteral("d14"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARMRegisters::d15, QStringLiteral("d15"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                   ;
-        return info;
-    }
-
-#undef HAVE_ALU_OPS_WITH_MEM_OPERAND
-    static const int RegisterSize = 4;
-
-    static const int RegisterArgumentCount = 4;
-    static RegisterID registerForArgument(int index)
-    {
-        static RegisterID regs[RegisterArgumentCount] = {
-            JSC::ARMRegisters::r0,
-            JSC::ARMRegisters::r1,
-            JSC::ARMRegisters::r2,
-            JSC::ARMRegisters::r3
-        };
-
-        Q_ASSERT(index >= 0 && index < RegisterArgumentCount);
-        return regs[index];
-    };
-
-    static const int StackAlignment = 8; // Per AAPCS
-    static const int StackShadowSpace = 0;
-    static const int StackSpaceAllocatedUponFunctionEntry = 1 * RegisterSize; // Registers saved in platformEnterStandardStackFrame below.
-
-    static void platformEnterStandardStackFrame(PlatformAssembler *as)
-    {
-        as->push(JSC::ARMRegisters::lr);
-        as->push(FramePointerRegister);
-    }
-
-    static void platformFinishEnteringStandardStackFrame(PlatformAssembler *) {}
-
-    static void platformLeaveStandardStackFrame(PlatformAssembler *as, int frameSize)
-    {
-        if (frameSize > 0) {
-            // Work around bug in ARMv7Assembler.h where add32(imm, sp, sp) doesn't
-            // work well for large immediates.
-            as->move(TrustedImm32(frameSize), JSC::ARMRegisters::r3);
-            as->add32(JSC::ARMRegisters::r3, StackPointerRegister);
-        }
-        as->pop(FramePointerRegister);
-        as->pop(JSC::ARMRegisters::lr);
-    }
-
-    static const int gotRegister = -1;
-    static int savedGOTRegisterSlotOnStack() { return -1; }
-};
-#endif // ARM (32 bit)
-
-#if CPU(ARM64) || defined(V4_BOOTSTRAP)
-template <>
-class TargetPlatform<JSC::MacroAssemblerARM64, NoOperatingSystemSpecialization>
-{
-public:
-    using PlatformAssembler = JSC::MacroAssemblerARM64;
-    using RegisterID = PlatformAssembler::RegisterID;
-    using FPRegisterID = PlatformAssembler::FPRegisterID;
-    using TrustedImm32 = PlatformAssembler::TrustedImm32;
-
-    enum { RegAllocIsSupported = 1 };
-
-    static const RegisterID FramePointerRegister = JSC::ARM64Registers::fp;
-    static const RegisterID LocalsRegister = JSC::ARM64Registers::x28;
-    static const RegisterID StackPointerRegister = JSC::ARM64Registers::sp;
-    static const RegisterID ScratchRegister = JSC::ARM64Registers::x9;
-    static const RegisterID EngineRegister = JSC::ARM64Registers::x27;
-    static const RegisterID ReturnValueRegister = JSC::ARM64Registers::x0;
-    static const RegisterID DoubleMaskRegister = JSC::ARM64Registers::x26;
-    static const FPRegisterID FPGpr0 = JSC::ARM64Registers::q0;
-    static const FPRegisterID FPGpr1 = JSC::ARM64Registers::q1;
-
-    static RegisterInformation getRegisterInfo()
-    {
-        typedef RegisterInfo RI;
-        static RegisterInformation info = RegisterInformation()
-                << RI(JSC::ARM64Registers::x0,  QStringLiteral("x0"),  RI::RegularRegister,       RI::CallerSaved, RI::Predefined)
-                << RI(JSC::ARM64Registers::x1,  QStringLiteral("x1"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x2,  QStringLiteral("x2"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x3,  QStringLiteral("x3"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x4,  QStringLiteral("x4"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x5,  QStringLiteral("x5"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x6,  QStringLiteral("x6"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x7,  QStringLiteral("x7"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x8,  QStringLiteral("x8"),  RI::RegularRegister,       RI::CallerSaved, RI::Predefined)
-                << RI(JSC::ARM64Registers::x9,  QStringLiteral("x9"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::ARM64Registers::x10, QStringLiteral("x10"), RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x11, QStringLiteral("x11"), RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x12, QStringLiteral("x12"), RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x13, QStringLiteral("x13"), RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x14, QStringLiteral("x14"), RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x15, QStringLiteral("x15"), RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x19, QStringLiteral("x19"), RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x20, QStringLiteral("x20"), RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x21, QStringLiteral("x21"), RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x22, QStringLiteral("x22"), RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x23, QStringLiteral("x23"), RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x24, QStringLiteral("x24"), RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x25, QStringLiteral("x25"), RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::x26, QStringLiteral("x26"), RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::ARM64Registers::x27, QStringLiteral("x27"), RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::ARM64Registers::x28, QStringLiteral("x28"), RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-
-                << RI(JSC::ARM64Registers::q2,  QStringLiteral("q2"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q3,  QStringLiteral("q3"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q4,  QStringLiteral("q4"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q5,  QStringLiteral("q5"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q6,  QStringLiteral("q6"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q8,  QStringLiteral("q8"),  RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q9,  QStringLiteral("q9"),  RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q10, QStringLiteral("q10"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q11, QStringLiteral("q11"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q12, QStringLiteral("q12"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q13, QStringLiteral("q13"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q14, QStringLiteral("q14"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q15, QStringLiteral("q15"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q16, QStringLiteral("q16"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q17, QStringLiteral("q17"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q18, QStringLiteral("q18"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q19, QStringLiteral("q19"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q20, QStringLiteral("q20"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q21, QStringLiteral("q21"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q22, QStringLiteral("q22"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q23, QStringLiteral("q23"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q24, QStringLiteral("q24"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q25, QStringLiteral("q25"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q26, QStringLiteral("q26"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q27, QStringLiteral("q27"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q28, QStringLiteral("q28"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q29, QStringLiteral("q29"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q30, QStringLiteral("q30"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::ARM64Registers::q31, QStringLiteral("q31"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                   ;
-        return info;
-    }
-
-#undef HAVE_ALU_OPS_WITH_MEM_OPERAND
-    static const int RegisterSize = 8;
-
-    static const int RegisterArgumentCount = 8;
-    static RegisterID registerForArgument(int index)
-    {
-        static RegisterID regs[RegisterArgumentCount] = {
-            JSC::ARM64Registers::x0,
-            JSC::ARM64Registers::x1,
-            JSC::ARM64Registers::x2,
-            JSC::ARM64Registers::x3,
-            JSC::ARM64Registers::x4,
-            JSC::ARM64Registers::x5,
-            JSC::ARM64Registers::x6,
-            JSC::ARM64Registers::x7
-        };
-
-        Q_ASSERT(index >= 0 && index < RegisterArgumentCount);
-        return regs[index];
-    };
-
-    static const int StackAlignment = 16;
-    static const int StackShadowSpace = 0;
-    static const int StackSpaceAllocatedUponFunctionEntry = 1 * RegisterSize; // Registers saved in platformEnterStandardStackFrame below.
-
-    static void platformEnterStandardStackFrame(PlatformAssembler *as)
-    {
-        as->pushPair(FramePointerRegister, JSC::ARM64Registers::lr);
-    }
-
-    static void platformFinishEnteringStandardStackFrame(PlatformAssembler *as)
-    {
-        as->move(PlatformAssembler::TrustedImm64(QV4::Value::NaNEncodeMask), DoubleMaskRegister);
-    }
-
-    static void platformLeaveStandardStackFrame(PlatformAssembler *as, int frameSize)
-    {
-        if (frameSize > 0)
-            as->add64(TrustedImm32(frameSize), StackPointerRegister);
-        as->popPair(FramePointerRegister, JSC::ARM64Registers::lr);
-    }
-
-    static const int gotRegister = -1;
-    static int savedGOTRegisterSlotOnStack() { return -1; }
-};
-#endif // ARM64
-
-#if defined(Q_PROCESSOR_MIPS_32) && defined(Q_OS_LINUX)
-template <>
-class TargetPlatform<JSC::MacroAssemblerMIPS, NoOperatingSystemSpecialization>
-{
-public:
-    using PlatformAssembler = JSC::MacroAssemblerMIPS;
-    using RegisterID = PlatformAssembler::RegisterID;
-    using FPRegisterID = PlatformAssembler::FPRegisterID;
-    using TrustedImm32 = PlatformAssembler::TrustedImm32;
-    enum { RegAllocIsSupported = 1 };
-
-    static const RegisterID FramePointerRegister = JSC::MIPSRegisters::fp;
-    static const RegisterID StackPointerRegister = JSC::MIPSRegisters::sp;
-    static const RegisterID LocalsRegister = JSC::MIPSRegisters::s0;
-    static const RegisterID EngineRegister = JSC::MIPSRegisters::s1;
-    static const RegisterID ReturnValueRegister = JSC::MIPSRegisters::v0;
-    static const RegisterID ScratchRegister = JSC::MIPSRegisters::s2;
-    static const FPRegisterID FPGpr0 = JSC::MIPSRegisters::f0;
-    static const FPRegisterID FPGpr1 = JSC::MIPSRegisters::f2;
-    static const RegisterID LowReturnValueRegister = JSC::MIPSRegisters::v0;
-    static const RegisterID HighReturnValueRegister = JSC::MIPSRegisters::v1;
-
-    static RegisterInformation getRegisterInfo()
-    {
-        typedef RegisterInfo RI;
-        static RegisterInformation info = RegisterInformation()
-                // Note: t0, t1, t2, t3 and f16 are already used by MacroAssemblerMIPS.
-                << RI(JSC::MIPSRegisters::t4,  QStringLiteral("t4"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::t5,  QStringLiteral("t5"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::t6,  QStringLiteral("t6"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::t7,  QStringLiteral("t7"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::t8,  QStringLiteral("t8"),  RI::RegularRegister,       RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::s0,  QStringLiteral("s0"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::MIPSRegisters::s1,  QStringLiteral("s1"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::MIPSRegisters::s2,  QStringLiteral("s2"),  RI::RegularRegister,       RI::CalleeSaved, RI::Predefined)
-                << RI(JSC::MIPSRegisters::s3,  QStringLiteral("s3"),  RI::RegularRegister,       RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::f4,  QStringLiteral("f4"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::f6,  QStringLiteral("f6"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::f8,  QStringLiteral("f8"),  RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::f10, QStringLiteral("f10"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::f18, QStringLiteral("f18"), RI::FloatingPointRegister, RI::CallerSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::f20, QStringLiteral("f20"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::f22, QStringLiteral("f22"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::f24, QStringLiteral("f24"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::f26, QStringLiteral("f26"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                << RI(JSC::MIPSRegisters::f28, QStringLiteral("f28"), RI::FloatingPointRegister, RI::CalleeSaved, RI::RegAlloc)
-                   ;
-        return info;
-    }
-
-#undef HAVE_ALU_OPS_WITH_MEM_OPERAND
-    static const int RegisterSize = 4;
-
-    static const int RegisterArgumentCount = 4;
-    static RegisterID registerForArgument(int index)
-    {
-        static RegisterID regs[RegisterArgumentCount] = {
-            JSC::MIPSRegisters::a0,
-            JSC::MIPSRegisters::a1,
-            JSC::MIPSRegisters::a2,
-            JSC::MIPSRegisters::a3
-        };
-
-        Q_ASSERT(index >= 0 && index < RegisterArgumentCount);
-        return regs[index];
-    };
-
-    static const int StackAlignment = 8;
-    static const int StackShadowSpace = 4 * RegisterSize; // Stack space for 4 argument registers.
-    static const int StackSpaceAllocatedUponFunctionEntry = 1 * RegisterSize; // Registers saved in platformEnterStandardStackFrame below.
-
-    static void platformEnterStandardStackFrame(PlatformAssembler *as)
-    {
-        as->push(JSC::MIPSRegisters::ra);
-        as->push(FramePointerRegister);
-    }
-
-    static void platformFinishEnteringStandardStackFrame(PlatformAssembler *) {}
-
-    static void platformLeaveStandardStackFrame(PlatformAssembler *as, int frameSize)
-    {
-        if (frameSize > 0)
-            as->add32(TrustedImm32(frameSize), StackPointerRegister);
-        as->pop(FramePointerRegister);
-        as->pop(JSC::MIPSRegisters::ra);
-    }
-
-
-    static const int gotRegister = -1;
-    static int savedGOTRegisterSlotOnStack() { return -1; }
-};
-#endif // Linux on MIPS (32 bit)
-
-} // JIT namespace
-} // QV4 namespace
-
-QT_END_NAMESPACE
-
-#endif // ENABLE(ASSEMBLER)
-
-#endif // QV4TARGETPLATFORM_P_H
diff --git a/src/qml/jit/qv4unop.cpp b/src/qml/jit/qv4unop.cpp
deleted file mode 100644
index 78546e1509..0000000000
--- a/src/qml/jit/qv4unop.cpp
+++ /dev/null
@@ -1,166 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-#include <qv4unop_p.h>
-#include <qv4assembler_p.h>
-
-#if ENABLE(ASSEMBLER)
-
-using namespace QV4;
-using namespace JIT;
-
-#define stringIfyx(s) #s
-#define stringIfy(s) stringIfyx(s)
-#define setOp(operation) \
-    do { \
-        call = typename JITAssembler::RuntimeCall(QV4::Runtime::operation); name = "Runtime::" stringIfy(operation); \
-        needsExceptionCheck = Runtime::Method_##operation##_NeedsExceptionCheck; \
-    } while (0)
-
-template <typename JITAssembler>
-void Unop<JITAssembler>::generate(IR::Expr *source, IR::Expr *target)
-{
-    bool needsExceptionCheck;
-    typename JITAssembler::RuntimeCall call;
-    const char *name = 0;
-    switch (op) {
-    case IR::OpNot:
-        generateNot(source, target);
-        return;
-    case IR::OpUMinus:
-        generateUMinus(source, target);
-        return;
-    case IR::OpUPlus: setOp(uPlus); break;
-    case IR::OpCompl:
-        generateCompl(source, target);
-        return;
-    case IR::OpIncrement: setOp(increment); break;
-    case IR::OpDecrement: setOp(decrement); break;
-    default:
-        Q_UNREACHABLE();
-    } // switch
-
-    Q_ASSERT(call.isValid());
-    _as->generateFunctionCallImp(needsExceptionCheck, target, name, call, PointerToValue(source));
-}
-
-template <typename JITAssembler>
-void Unop<JITAssembler>::generateUMinus(IR::Expr *source, IR::Expr *target)
-{
-    IR::Temp *targetTemp = target->asTemp();
-
-    if (IR::Const *c = source->asConst()) {
-        if (c->value == 0 && source->type == IR::SInt32Type) {
-            // special case: minus integer 0 is 0, which is not what JS expects it to be, so always
-            // do a runtime call
-            generateRuntimeCall(_as, target, uMinus, PointerToValue(source));
-            return;
-        }
-    }
-    if (source->type == IR::SInt32Type) {
-        typename JITAssembler::RegisterID tReg = JITAssembler::ScratchRegister;
-        if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister)
-            tReg = (typename JITAssembler::RegisterID) targetTemp->index;
-        typename JITAssembler::RegisterID sReg = _as->toInt32Register(source, tReg);
-        _as->move(sReg, tReg);
-        _as->neg32(tReg);
-        if (!targetTemp || targetTemp->kind != IR::Temp::PhysicalRegister)
-            _as->storeInt32(tReg, target);
-        return;
-    }
-
-    generateRuntimeCall(_as, target, uMinus, PointerToValue(source));
-}
-
-template <typename JITAssembler>
-void Unop<JITAssembler>::generateNot(IR::Expr *source, IR::Expr *target)
-{
-    IR::Temp *targetTemp = target->asTemp();
-    if (source->type == IR::BoolType) {
-        typename JITAssembler::RegisterID tReg = JITAssembler::ScratchRegister;
-        if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister)
-            tReg = (typename JITAssembler::RegisterID) targetTemp->index;
-        _as->xor32(TrustedImm32(0x1), _as->toInt32Register(source, tReg), tReg);
-        if (!targetTemp || targetTemp->kind != IR::Temp::PhysicalRegister)
-            _as->storeBool(tReg, target);
-        return;
-    } else if (source->type == IR::SInt32Type) {
-        typename JITAssembler::RegisterID tReg = JITAssembler::ScratchRegister;
-        if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister)
-            tReg = (typename JITAssembler::RegisterID) targetTemp->index;
-        _as->compare32(RelationalCondition::Equal,
-                      _as->toInt32Register(source, JITAssembler::ScratchRegister), TrustedImm32(0),
-                      tReg);
-        if (!targetTemp || targetTemp->kind != IR::Temp::PhysicalRegister)
-            _as->storeBool(tReg, target);
-        return;
-    } else if (source->type == IR::DoubleType) {
-        // ###
-    }
-    // ## generic implementation testing for int/bool
-
-    generateRuntimeCall(_as, target, uNot, PointerToValue(source));
-}
-
-template <typename JITAssembler>
-void Unop<JITAssembler>::generateCompl(IR::Expr *source, IR::Expr *target)
-{
-    IR::Temp *targetTemp = target->asTemp();
-    if (source->type == IR::SInt32Type) {
-        typename JITAssembler::RegisterID tReg = JITAssembler::ScratchRegister;
-        if (targetTemp && targetTemp->kind == IR::Temp::PhysicalRegister)
-            tReg = (typename JITAssembler::RegisterID) targetTemp->index;
-        _as->xor32(TrustedImm32(0xffffffff), _as->toInt32Register(source, tReg), tReg);
-        if (!targetTemp || targetTemp->kind != IR::Temp::PhysicalRegister)
-            _as->storeInt32(tReg, target);
-        return;
-    }
-    generateRuntimeCall(_as, target, complement, PointerToValue(source));
-}
-
-template struct QV4::JIT::Unop<QV4::JIT::Assembler<DefaultAssemblerTargetConfiguration>>;
-#if defined(V4_BOOTSTRAP)
-#if !CPU(ARM_THUMB2)
-template struct QV4::JIT::Unop<QV4::JIT::Assembler<AssemblerTargetConfiguration<JSC::MacroAssemblerARMv7, NoOperatingSystemSpecialization>>>;
-#endif
-#if !CPU(ARM64)
-template struct QV4::JIT::Unop<QV4::JIT::Assembler<AssemblerTargetConfiguration<JSC::MacroAssemblerARM64, NoOperatingSystemSpecialization>>>;
-#endif
-#endif
-
-#endif
diff --git a/src/qml/jsapi/qjsengine.cpp b/src/qml/jsapi/qjsengine.cpp
index d5b8b295a7..bca4057fbe 100644
--- a/src/qml/jsapi/qjsengine.cpp
+++ b/src/qml/jsapi/qjsengine.cpp
@@ -443,15 +443,14 @@ QJSValue QJSEngine::evaluate(const QString& program, const QString& fileName, in
 {
     QV4::ExecutionEngine *v4 = d->m_v4Engine;
     QV4::Scope scope(v4);
-    QV4::ExecutionContextSaver saver(scope);
-
-    QV4::ExecutionContext *ctx = v4->currentContext;
-    if (ctx->d() != v4->rootContext()->d())
-        ctx = v4->pushGlobalContext();
     QV4::ScopedValue result(scope);
 
-    QV4::Script script(ctx, program, fileName, lineNumber);
-    script.strictMode = ctx->d()->strictMode;
+    QV4::Script script(v4->rootContext(), QV4::Compiler::EvalCode, program, fileName, lineNumber);
+    script.strictMode = false;
+    if (v4->currentStackFrame)
+        script.strictMode = v4->currentStackFrame->v4Function->isStrict();
+    else if (v4->globalCode)
+        script.strictMode = v4->globalCode->isStrict();
     script.inheritContext = true;
     script.parse();
     if (!scope.engine->hasException)
@@ -459,7 +458,9 @@ QJSValue QJSEngine::evaluate(const QString& program, const QString& fileName, in
     if (scope.engine->hasException)
         result = v4->catchException();
 
-    return QJSValue(v4, result->asReturnedValue());
+    QJSValue retval(v4, result->asReturnedValue());
+
+    return retval;
 }
 
 /*!
diff --git a/src/qml/jsapi/qjsvalue.cpp b/src/qml/jsapi/qjsvalue.cpp
index 953e5d3ef6..c1a135c835 100644
--- a/src/qml/jsapi/qjsvalue.cpp
+++ b/src/qml/jsapi/qjsvalue.cpp
@@ -53,7 +53,7 @@
 #include "qv4errorobject_p.h"
 #include "private/qv8engine_p.h"
 #include <private/qv4mm_p.h>
-#include <private/qv4scopedvalue_p.h>
+#include <private/qv4jscall_p.h>
 #include <private/qv4qobjectwrapper_p.h>
 
 /*!
@@ -664,21 +664,21 @@ QJSValue QJSValue::call(const QJSValueList &args)
     Q_ASSERT(engine);
 
     Scope scope(engine);
-    ScopedCallData callData(scope, args.length());
-    callData->thisObject = engine->globalObject;
+    JSCallData jsCallData(scope, args.length());
+    *jsCallData->thisObject = engine->globalObject;
     for (int i = 0; i < args.size(); ++i) {
         if (!QJSValuePrivate::checkEngine(engine, args.at(i))) {
             qWarning("QJSValue::call() failed: cannot call function with argument created in a different engine");
             return QJSValue();
         }
-        callData->args[i] = QJSValuePrivate::convertedToValue(engine, args.at(i));
+        jsCallData->args[i] = QJSValuePrivate::convertedToValue(engine, args.at(i));
     }
 
-    f->call(scope, callData);
+    ScopedValue result(scope, f->call(jsCallData));
     if (engine->hasException)
-        scope.result = engine->catchException();
+        result = engine->catchException();
 
-    return QJSValue(engine, scope.result.asReturnedValue());
+    return QJSValue(engine, result->asReturnedValue());
 }
 
 /*!
@@ -720,21 +720,21 @@ QJSValue QJSValue::callWithInstance(const QJSValue &instance, const QJSValueList
         return QJSValue();
     }
 
-    ScopedCallData callData(scope, args.size());
-    callData->thisObject = QJSValuePrivate::convertedToValue(engine, instance);
+    JSCallData jsCallData(scope, args.size());
+    *jsCallData->thisObject = QJSValuePrivate::convertedToValue(engine, instance);
     for (int i = 0; i < args.size(); ++i) {
         if (!QJSValuePrivate::checkEngine(engine, args.at(i))) {
             qWarning("QJSValue::call() failed: cannot call function with argument created in a different engine");
             return QJSValue();
         }
-        callData->args[i] = QJSValuePrivate::convertedToValue(engine, args.at(i));
+        jsCallData->args[i] = QJSValuePrivate::convertedToValue(engine, args.at(i));
     }
 
-    f->call(scope, callData);
+    ScopedValue result(scope, f->call(jsCallData));
     if (engine->hasException)
-        scope.result = engine->catchException();
+        result = engine->catchException();
 
-    return QJSValue(engine, scope.result.asReturnedValue());
+    return QJSValue(engine, result->asReturnedValue());
 }
 
 /*!
@@ -769,20 +769,20 @@ QJSValue QJSValue::callAsConstructor(const QJSValueList &args)
     Q_ASSERT(engine);
 
     Scope scope(engine);
-    ScopedCallData callData(scope, args.size());
+    JSCallData jsCallData(scope, args.size());
     for (int i = 0; i < args.size(); ++i) {
         if (!QJSValuePrivate::checkEngine(engine, args.at(i))) {
             qWarning("QJSValue::callAsConstructor() failed: cannot construct function with argument created in a different engine");
             return QJSValue();
         }
-        callData->args[i] = QJSValuePrivate::convertedToValue(engine, args.at(i));
+        jsCallData->args[i] = QJSValuePrivate::convertedToValue(engine, args.at(i));
     }
 
-    f->construct(scope, callData);
+    ScopedValue result(scope, f->callAsConstructor(jsCallData));
     if (engine->hasException)
-        scope.result = engine->catchException();
+        result = engine->catchException();
 
-    return QJSValue(engine, scope.result.asReturnedValue());
+    return QJSValue(engine, result->asReturnedValue());
 }
 
 #ifdef QT_DEPRECATED
@@ -1173,10 +1173,7 @@ bool QJSValue::deleteProperty(const QString &name)
         return false;
 
     ScopedString s(scope, engine->newString(name));
-    bool b = o->deleteProperty(s);
-    if (engine->hasException)
-        engine->catchException();
-    return b;
+    return o->deleteProperty(s);
 }
 
 /*!
diff --git a/src/qml/jsruntime/jsruntime.pri b/src/qml/jsruntime/jsruntime.pri
index ebdb3d6d03..519c87d0c4 100644
--- a/src/qml/jsruntime/jsruntime.pri
+++ b/src/qml/jsruntime/jsruntime.pri
@@ -33,6 +33,7 @@ SOURCES += \
     $$PWD/qv4variantobject.cpp \
     $$PWD/qv4objectiterator.cpp \
     $$PWD/qv4regexp.cpp \
+    $$PWD/qv4runtimecodegen.cpp \
     $$PWD/qv4serialize.cpp \
     $$PWD/qv4script.cpp \
     $$PWD/qv4sequenceobject.cpp \
@@ -58,6 +59,7 @@ HEADERS += \
     $$PWD/qv4identifiertable_p.h \
     $$PWD/qv4managed_p.h \
     $$PWD/qv4internalclass_p.h \
+    $$PWD/qv4jscall_p.h \
     $$PWD/qv4sparsearray_p.h \
     $$PWD/qv4arraydata_p.h \
     $$PWD/qv4arrayobject_p.h \
@@ -76,6 +78,7 @@ HEADERS += \
     $$PWD/qv4objectproto_p.h \
     $$PWD/qv4qmlcontext_p.h \
     $$PWD/qv4regexpobject_p.h \
+    $$PWD/qv4runtimecodegen_p.h \
     $$PWD/qv4stringobject_p.h \
     $$PWD/qv4variantobject_p.h \
     $$PWD/qv4property_p.h \
diff --git a/src/qml/jsruntime/qv4argumentsobject.cpp b/src/qml/jsruntime/qv4argumentsobject.cpp
index 0905c2828a..075e7afd8a 100644
--- a/src/qml/jsruntime/qv4argumentsobject.cpp
+++ b/src/qml/jsruntime/qv4argumentsobject.cpp
@@ -41,40 +41,53 @@
 #include <qv4scopedvalue_p.h>
 #include <qv4string_p.h>
 #include <qv4function_p.h>
+#include <qv4jscall_p.h>
 
 using namespace QV4;
 
 DEFINE_OBJECT_VTABLE(ArgumentsObject);
+DEFINE_OBJECT_VTABLE(StrictArgumentsObject);
 
-void Heap::ArgumentsObject::init(QV4::CallContext *context)
+void Heap::ArgumentsObject::init(QV4::CppStackFrame *frame)
 {
     ExecutionEngine *v4 = internalClass->engine;
 
+    int nFormals = frame->v4Function->nFormals;
+    QV4::CallContext *context = static_cast<QV4::CallContext *>(frame->context());
+
     Object::init();
     fullyCreated = false;
+    this->nFormals = nFormals;
     this->context.set(v4, context->d());
     Q_ASSERT(vtable() == QV4::ArgumentsObject::staticVTable());
 
+    Q_ASSERT(CalleePropertyIndex == internalClass->find(v4->id_callee()));
+    setProperty(v4, CalleePropertyIndex, context->d()->function);
+    Q_ASSERT(LengthPropertyIndex == internalClass->find(v4->id_length()));
+    setProperty(v4, LengthPropertyIndex, Primitive::fromInt32(context->argc()));
+}
+
+void Heap::StrictArgumentsObject::init(QV4::CppStackFrame *frame)
+{
+    Q_ASSERT(vtable() == QV4::StrictArgumentsObject::staticVTable());
+    ExecutionEngine *v4 = internalClass->engine;
+
+    Object::init();
+
+    Q_ASSERT(CalleePropertyIndex == internalClass->find(v4->id_callee()));
+    Q_ASSERT(CallerPropertyIndex == internalClass->find(v4->id_caller()));
+    setProperty(v4, CalleePropertyIndex + QV4::Object::GetterOffset, *v4->thrower());
+    setProperty(v4, CalleePropertyIndex + QV4::Object::SetterOffset, *v4->thrower());
+    setProperty(v4, CallerPropertyIndex + QV4::Object::GetterOffset, *v4->thrower());
+    setProperty(v4, CallerPropertyIndex + QV4::Object::SetterOffset, *v4->thrower());
+
     Scope scope(v4);
-    Scoped<QV4::ArgumentsObject> args(scope, this);
-
-    if (context->d()->strictMode) {
-        Q_ASSERT(CalleePropertyIndex == args->internalClass()->find(v4->id_callee()));
-        Q_ASSERT(CallerPropertyIndex == args->internalClass()->find(v4->id_caller()));
-        args->setProperty(CalleePropertyIndex + QV4::Object::GetterOffset, *v4->thrower());
-        args->setProperty(CalleePropertyIndex + QV4::Object::SetterOffset, *v4->thrower());
-        args->setProperty(CallerPropertyIndex + QV4::Object::GetterOffset, *v4->thrower());
-        args->setProperty(CallerPropertyIndex + QV4::Object::SetterOffset, *v4->thrower());
-
-        args->arrayReserve(context->argc());
-        args->arrayPut(0, context->args(), context->argc());
-        args->d()->fullyCreated = true;
-    } else {
-        Q_ASSERT(CalleePropertyIndex == args->internalClass()->find(v4->id_callee()));
-        args->setProperty(CalleePropertyIndex, context->d()->function);
-    }
+    Scoped<QV4::StrictArgumentsObject> args(scope, this);
+    args->arrayReserve(frame->originalArgumentsCount);
+    args->arrayPut(0, frame->originalArguments, frame->originalArgumentsCount);
+
     Q_ASSERT(LengthPropertyIndex == args->internalClass()->find(v4->id_length()));
-    args->setProperty(LengthPropertyIndex, Primitive::fromInt32(context->d()->callData->argc));
+    setProperty(v4, LengthPropertyIndex, Primitive::fromInt32(frame->originalArgumentsCount));
 }
 
 void ArgumentsObject::fullyCreate()
@@ -84,8 +97,8 @@ void ArgumentsObject::fullyCreate()
 
     Scope scope(engine());
 
-    uint argCount = context()->callData->argc;
-    uint numAccessors = qMin(context()->formalParameterCount(), argCount);
+    int argCount = context()->argc();
+    uint numAccessors = qMin(d()->nFormals, argCount);
     ArrayData::realloc(this, Heap::ArrayData::Sparse, argCount, true);
     scope.engine->requireArgumentsAccessors(numAccessors);
 
@@ -93,12 +106,12 @@ void ArgumentsObject::fullyCreate()
     if (numAccessors) {
         d()->mappedArguments.set(scope.engine, md->allocate(scope.engine, numAccessors));
         for (uint i = 0; i < numAccessors; ++i) {
-            d()->mappedArguments->values.set(scope.engine, i, context()->callData->args[i]);
+            d()->mappedArguments->values.set(scope.engine, i, context()->args()[i]);
             arraySet(i, scope.engine->argumentsAccessors + i, Attr_Accessor);
         }
     }
-    arrayPut(numAccessors, context()->callData->args + numAccessors, argCount - numAccessors);
-    for (uint i = numAccessors; i < argCount; ++i)
+    arrayPut(numAccessors, context()->args() + numAccessors, argCount - numAccessors);
+    for (int i = int(numAccessors); i < argCount; ++i)
         setArrayAttributes(i, Attr_Data);
 
     d()->fullyCreated = true;
@@ -111,7 +124,7 @@ bool ArgumentsObject::defineOwnProperty(ExecutionEngine *engine, uint index, con
     Scope scope(engine);
     ScopedProperty map(scope);
     PropertyAttributes mapAttrs;
-    uint numAccessors = qMin(context()->formalParameterCount(), static_cast<uint>(context()->callData->argc));
+    uint numAccessors = qMin(d()->nFormals, context()->argc());
     bool isMapped = false;
     if (arrayData() && index < numAccessors &&
         arrayData()->attributes(index).isAccessor() &&
@@ -127,18 +140,18 @@ bool ArgumentsObject::defineOwnProperty(ExecutionEngine *engine, uint index, con
         arrayIndex.set(scope.engine, d()->mappedArguments->values[index]);
     }
 
-    bool strict = engine->current->strictMode;
-    engine->current->strictMode = false;
     bool result = Object::defineOwnProperty2(scope.engine, index, desc, attrs);
-    engine->current->strictMode = strict;
+    if (!result) {
+        return false;
+    }
 
     if (isMapped && attrs.isData()) {
         Q_ASSERT(arrayData());
         ScopedFunctionObject setter(scope, map->setter());
-        ScopedCallData callData(scope, 1);
-        callData->thisObject = this->asReturnedValue();
-        callData->args[0] = desc->value;
-        setter->call(scope, callData);
+        JSCallData jsCallData(scope, 1);
+        *jsCallData->thisObject = this->asReturnedValue();
+        jsCallData->args[0] = desc->value;
+        setter->call(jsCallData);
 
         if (attrs.isWritable()) {
             setArrayAttributes(index, mapAttrs);
@@ -146,8 +159,6 @@ bool ArgumentsObject::defineOwnProperty(ExecutionEngine *engine, uint index, con
         }
     }
 
-    if (engine->current->strictMode && !result)
-        return engine->throwTypeError();
     return result;
 }
 
@@ -157,10 +168,10 @@ ReturnedValue ArgumentsObject::getIndexed(const Managed *m, uint index, bool *ha
     if (args->fullyCreated())
         return Object::getIndexed(m, index, hasProperty);
 
-    if (index < static_cast<uint>(args->context()->callData->argc)) {
+    if (index < static_cast<uint>(args->context()->argc())) {
         if (hasProperty)
             *hasProperty = true;
-        return args->context()->callData->args[index].asReturnedValue();
+        return args->context()->args()[index].asReturnedValue();
     }
     if (hasProperty)
         *hasProperty = false;
@@ -170,13 +181,13 @@ ReturnedValue ArgumentsObject::getIndexed(const Managed *m, uint index, bool *ha
 bool ArgumentsObject::putIndexed(Managed *m, uint index, const Value &value)
 {
     ArgumentsObject *args = static_cast<ArgumentsObject *>(m);
-    if (!args->fullyCreated() && index >= static_cast<uint>(args->context()->callData->argc))
+    if (!args->fullyCreated() && index >= static_cast<uint>(args->context()->argc()))
         args->fullyCreate();
 
     if (args->fullyCreated())
         return Object::putIndexed(m, index, value);
 
-    args->context()->callData->args[index] = value;
+    args->context()->setArg(index, value);
     return true;
 }
 
@@ -194,8 +205,8 @@ PropertyAttributes ArgumentsObject::queryIndexed(const Managed *m, uint index)
     if (args->fullyCreated())
         return Object::queryIndexed(m, index);
 
-    uint numAccessors = qMin((int)args->context()->formalParameterCount(), args->context()->callData->argc);
-    uint argCount = args->context()->callData->argc;
+    uint numAccessors = qMin(args->d()->nFormals, args->context()->argc());
+    uint argCount = args->context()->argc();
     if (index >= argCount)
         return PropertyAttributes();
     if (index >= numAccessors)
@@ -205,35 +216,33 @@ PropertyAttributes ArgumentsObject::queryIndexed(const Managed *m, uint index)
 
 DEFINE_OBJECT_VTABLE(ArgumentsGetterFunction);
 
-void ArgumentsGetterFunction::call(const Managed *getter, Scope &scope, CallData *callData)
+ReturnedValue ArgumentsGetterFunction::call(const FunctionObject *getter, const Value *thisObject, const Value *, int)
 {
-    ExecutionEngine *v4 = static_cast<const ArgumentsGetterFunction *>(getter)->engine();
-    Scoped<ArgumentsGetterFunction> g(scope, static_cast<const ArgumentsGetterFunction *>(getter));
-    Scoped<ArgumentsObject> o(scope, callData->thisObject.as<ArgumentsObject>());
-    if (!o) {
-        scope.result = v4->throwTypeError();
-        return;
-    }
+    ExecutionEngine *v4 = getter->engine();
+    Scope scope(v4);
+    const ArgumentsGetterFunction *g = static_cast<const ArgumentsGetterFunction *>(getter);
+    Scoped<ArgumentsObject> o(scope, thisObject->as<ArgumentsObject>());
+    if (!o)
+        return v4->throwTypeError();
 
-    Q_ASSERT(g->index() < static_cast<unsigned>(o->context()->callData->argc));
-    scope.result = o->context()->callData->args[g->index()];
+    Q_ASSERT(g->index() < static_cast<unsigned>(o->context()->argc()));
+    return o->context()->args()[g->index()].asReturnedValue();
 }
 
 DEFINE_OBJECT_VTABLE(ArgumentsSetterFunction);
 
-void ArgumentsSetterFunction::call(const Managed *setter, Scope &scope, CallData *callData)
+ReturnedValue ArgumentsSetterFunction::call(const FunctionObject *setter, const Value *thisObject, const Value *argv, int argc)
 {
-    ExecutionEngine *v4 = static_cast<const ArgumentsSetterFunction *>(setter)->engine();
-    Scoped<ArgumentsSetterFunction> s(scope, static_cast<const ArgumentsSetterFunction *>(setter));
-    Scoped<ArgumentsObject> o(scope, callData->thisObject.as<ArgumentsObject>());
-    if (!o) {
-        scope.result = v4->throwTypeError();
-        return;
-    }
+    ExecutionEngine *v4 = setter->engine();
+    Scope scope(v4);
+    const ArgumentsSetterFunction *s = static_cast<const ArgumentsSetterFunction *>(setter);
+    Scoped<ArgumentsObject> o(scope, thisObject->as<ArgumentsObject>());
+    if (!o)
+        return v4->throwTypeError();
 
-    Q_ASSERT(s->index() < static_cast<unsigned>(o->context()->callData->argc));
-    o->context()->callData->args[s->index()] = callData->argc ? callData->args[0].asReturnedValue() : Encode::undefined();
-    scope.result = Encode::undefined();
+    Q_ASSERT(s->index() < static_cast<unsigned>(o->context()->argc()));
+    o->context()->setArg(s->index(), argc ? argv[0] : Primitive::undefinedValue());
+    return Encode::undefined();
 }
 
 uint ArgumentsObject::getLength(const Managed *m)
diff --git a/src/qml/jsruntime/qv4argumentsobject_p.h b/src/qml/jsruntime/qv4argumentsobject_p.h
index 46e1f884e8..ac281f555a 100644
--- a/src/qml/jsruntime/qv4argumentsobject_p.h
+++ b/src/qml/jsruntime/qv4argumentsobject_p.h
@@ -63,7 +63,7 @@ namespace Heap {
     Member(class, NoMark, uint, index)
 
 DECLARE_HEAP_OBJECT(ArgumentsGetterFunction, FunctionObject) {
-    DECLARE_MARK_TABLE(ArgumentsGetterFunction);
+    DECLARE_MARKOBJECTS(ArgumentsGetterFunction);
     inline void init(QV4::ExecutionContext *scope, uint index);
 };
 
@@ -71,23 +71,34 @@ DECLARE_HEAP_OBJECT(ArgumentsGetterFunction, FunctionObject) {
     Member(class, NoMark, uint, index)
 
 DECLARE_HEAP_OBJECT(ArgumentsSetterFunction, FunctionObject) {
-    DECLARE_MARK_TABLE(ArgumentsSetterFunction);
+    DECLARE_MARKOBJECTS(ArgumentsSetterFunction);
     inline void init(QV4::ExecutionContext *scope, uint index);
 };
 
 #define ArgumentsObjectMembers(class, Member) \
     Member(class, Pointer, CallContext *, context) \
     Member(class, Pointer, MemberData *, mappedArguments) \
-    Member(class, NoMark, bool, fullyCreated)
+    Member(class, NoMark, bool, fullyCreated) \
+    Member(class, NoMark, int, nFormals)
 
 DECLARE_HEAP_OBJECT(ArgumentsObject, Object) {
-    DECLARE_MARK_TABLE(ArgumentsObject);
+    DECLARE_MARKOBJECTS(ArgumentsObject);
+    enum {
+        LengthPropertyIndex = 0,
+        CalleePropertyIndex = 1
+    };
+    void init(CppStackFrame *frame);
+};
+
+#define StrictArgumentsObjectMembers(class, Member)
+
+DECLARE_HEAP_OBJECT(StrictArgumentsObject, Object) {
     enum {
         LengthPropertyIndex = 0,
         CalleePropertyIndex = 1,
         CallerPropertyIndex = 3
     };
-    void init(QV4::CallContext *context);
+    void init(CppStackFrame *frame);
 };
 
 }
@@ -97,7 +108,7 @@ struct ArgumentsGetterFunction: FunctionObject
     V4_OBJECT2(ArgumentsGetterFunction, FunctionObject)
 
     uint index() const { return d()->index; }
-    static void call(const Managed *that, Scope &scope, CallData *d);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 };
 
 inline void
@@ -112,7 +123,7 @@ struct ArgumentsSetterFunction: FunctionObject
     V4_OBJECT2(ArgumentsSetterFunction, FunctionObject)
 
     uint index() const { return d()->index; }
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 };
 
 inline void
@@ -131,8 +142,7 @@ struct ArgumentsObject: Object {
     bool fullyCreated() const { return d()->fullyCreated; }
 
     static bool isNonStrictArgumentsObject(Managed *m) {
-        return m->d()->vtable()->type == Type_ArgumentsObject &&
-                !static_cast<ArgumentsObject *>(m)->context()->strictMode;
+        return m->d()->vtable() == staticVTable();
     }
 
     bool defineOwnProperty(ExecutionEngine *engine, uint index, const Property *desc, PropertyAttributes attrs);
@@ -146,6 +156,11 @@ struct ArgumentsObject: Object {
 
 };
 
+struct StrictArgumentsObject : Object {
+    V4_OBJECT2(StrictArgumentsObject, Object)
+    Q_MANAGED_TYPE(ArgumentsObject)
+};
+
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/jsruntime/qv4arraybuffer.cpp b/src/qml/jsruntime/qv4arraybuffer.cpp
index ffe9aa846f..f7b9e8acef 100644
--- a/src/qml/jsruntime/qv4arraybuffer.cpp
+++ b/src/qml/jsruntime/qv4arraybuffer.cpp
@@ -40,6 +40,7 @@
 #include "qv4typedarray_p.h"
 #include "qv4dataview_p.h"
 #include "qv4string_p.h"
+#include "qv4jscall_p.h"
 
 using namespace QV4;
 
@@ -51,49 +52,42 @@ void Heap::ArrayBufferCtor::init(QV4::ExecutionContext *scope)
     Heap::FunctionObject::init(scope, QStringLiteral("ArrayBuffer"));
 }
 
-void ArrayBufferCtor::construct(const Managed *m, Scope &scope, CallData *callData)
+ReturnedValue ArrayBufferCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    ExecutionEngine *v4 = static_cast<const Object *>(m)->engine();
+    ExecutionEngine *v4 = f->engine();
+    Scope scope(v4);
 
-    ScopedValue l(scope, callData->argument(0));
+    ScopedValue l(scope, argc ? argv[0] : Primitive::undefinedValue());
     double dl = l->toInteger();
-    if (v4->hasException) {
-        scope.result = Encode::undefined();
-        return;
-    }
+    if (v4->hasException)
+        return Encode::undefined();
     uint len = (uint)qBound(0., dl, (double)UINT_MAX);
-    if (len != dl) {
-        scope.result = v4->throwRangeError(QLatin1String("ArrayBuffer constructor: invalid length"));
-        return;
-    }
+    if (len != dl)
+        return v4->throwRangeError(QLatin1String("ArrayBuffer constructor: invalid length"));
 
     Scoped<ArrayBuffer> a(scope, v4->newArrayBuffer(len));
-    if (scope.engine->hasException) {
-        scope.result = Encode::undefined();
-    } else {
-        scope.result = a->asReturnedValue();
-    }
+    if (scope.engine->hasException)
+        return Encode::undefined();
+
+    return a->asReturnedValue();
 }
 
 
-void ArrayBufferCtor::call(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue ArrayBufferCtor::call(const FunctionObject *f, const Value *, const Value *argv, int argc)
 {
-    construct(that, scope, callData);
+    return callAsConstructor(f, argv, argc);
 }
 
-void ArrayBufferCtor::method_isView(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayBufferCtor::method_isView(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    QV4::Scoped<TypedArray> a(scope, callData->argument(0));
-    if (!!a) {
-        scope.result = Encode(true);
-        return;
-    }
-    QV4::Scoped<DataView> v(scope, callData->argument(0));
-    if (!!v) {
-        scope.result = Encode(true);
-        return;
-    }
-    scope.result = Encode(false);
+    if (argc < 1)
+        return Encode(false);
+
+    if (argv[0].as<TypedArray>() ||
+        argv[0].as<DataView>())
+        return Encode(true);
+
+    return Encode(false);
 }
 
 
@@ -163,48 +157,51 @@ void ArrayBufferPrototype::init(ExecutionEngine *engine, Object *ctor)
     defineDefaultProperty(QStringLiteral("toString"), method_toString, 0);
 }
 
-void ArrayBufferPrototype::method_get_byteLength(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayBufferPrototype::method_get_byteLength(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Scoped<ArrayBuffer> v(scope, callData->thisObject);
-    if (!v)
-        THROW_TYPE_ERROR();
+    const ArrayBuffer *a = thisObject->as<ArrayBuffer>();
+    if (!a)
+        return b->engine()->throwTypeError();
 
-    scope.result = Encode(v->d()->data->size);
+    return Encode(a->d()->data->size);
 }
 
-void ArrayBufferPrototype::method_slice(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayBufferPrototype::method_slice(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<ArrayBuffer> a(scope, callData->thisObject);
+    ExecutionEngine *v4 = b->engine();
+    const ArrayBuffer *a = thisObject->as<ArrayBuffer>();
     if (!a)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
-    double start = callData->argc > 0 ? callData->args[0].toInteger() : 0;
-    double end = (callData->argc < 2 || callData->args[1].isUndefined()) ?
-                a->d()->data->size : callData->args[1].toInteger();
-    CHECK_EXCEPTION();
+    double start = argc > 0 ? argv[0].toInteger() : 0;
+    double end = (argc < 2 || argv[1].isUndefined()) ?
+                a->d()->data->size : argv[1].toInteger();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     double first = (start < 0) ? qMax(a->d()->data->size + start, 0.) : qMin(start, (double)a->d()->data->size);
     double final = (end < 0) ? qMax(a->d()->data->size + end, 0.) : qMin(end, (double)a->d()->data->size);
 
+    Scope scope(v4);
     ScopedFunctionObject constructor(scope, a->get(scope.engine->id_constructor()));
     if (!constructor)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
-    ScopedCallData cData(scope, 1);
     double newLen = qMax(final - first, 0.);
-    cData->args[0] = QV4::Encode(newLen);
-    constructor->construct(scope, cData);
-    QV4::Scoped<ArrayBuffer> newBuffer(scope, scope.result);
+    ScopedValue argument(scope, QV4::Encode(newLen));
+    QV4::Scoped<ArrayBuffer> newBuffer(scope, constructor->callAsConstructor(argument, 1));
     if (!newBuffer || newBuffer->d()->data->size < (int)newLen)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     memcpy(newBuffer->d()->data->data(), a->d()->data->data() + (uint)first, newLen);
+    return Encode::undefined();
 }
 
-void ArrayBufferPrototype::method_toString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayBufferPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Scoped<ArrayBuffer> a(scope, callData->thisObject);
+    ExecutionEngine *v4 = b->engine();
+    const ArrayBuffer *a = thisObject->as<ArrayBuffer>();
     if (!a)
         RETURN_UNDEFINED();
-    scope.result = scope.engine->newString(QString::fromUtf8(a->asByteArray()));
+    return Encode(v4->newString(QString::fromUtf8(a->asByteArray())));
 }
diff --git a/src/qml/jsruntime/qv4arraybuffer_p.h b/src/qml/jsruntime/qv4arraybuffer_p.h
index 4f7926d3dc..e236a23d1f 100644
--- a/src/qml/jsruntime/qv4arraybuffer_p.h
+++ b/src/qml/jsruntime/qv4arraybuffer_p.h
@@ -78,10 +78,10 @@ struct ArrayBufferCtor: FunctionObject
 {
     V4_OBJECT2(ArrayBufferCtor, FunctionObject)
 
-    static void construct(const Managed *m, Scope &scope, CallData *callData);
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 
-    static void method_isView(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_isView(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 
 };
 
@@ -104,9 +104,9 @@ struct ArrayBufferPrototype: Object
 {
     void init(ExecutionEngine *engine, Object *ctor);
 
-    static void method_get_byteLength(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_slice(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_get_byteLength(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_slice(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 
diff --git a/src/qml/jsruntime/qv4arraydata.cpp b/src/qml/jsruntime/qv4arraydata.cpp
index df9884d84a..390840fb1e 100644
--- a/src/qml/jsruntime/qv4arraydata.cpp
+++ b/src/qml/jsruntime/qv4arraydata.cpp
@@ -43,6 +43,7 @@
 #include "qv4runtime_p.h"
 #include "qv4argumentsobject_p.h"
 #include "qv4string_p.h"
+#include "qv4jscall_p.h"
 
 using namespace QV4;
 
@@ -52,7 +53,6 @@ const QV4::VTable QV4::ArrayData::static_vtbl = {
     0,
     0,
     0,
-    0,
     QV4::ArrayData::IsExecutionContext,
     QV4::ArrayData::IsString,
     QV4::ArrayData::IsObject,
@@ -63,7 +63,7 @@ const QV4::VTable QV4::ArrayData::static_vtbl = {
     QV4::ArrayData::MyType,
     "ArrayData",
     Q_VTABLE_FUNCTION(QV4::ArrayData, destroy),
-    0,
+    ArrayData::Data::markObjects,
     isEqualTo
 };
 
@@ -111,6 +111,13 @@ static Q_ALWAYS_INLINE void storeValue(ReturnedValue *target, uint value)
     *target = v.asReturnedValue();
 }
 
+void Heap::ArrayData::markObjects(Heap::Base *base, MarkStack *stack)
+{
+    ArrayData *a = static_cast<ArrayData *>(base);
+    a->values.mark(stack);
+}
+
+
 void ArrayData::realloc(Object *o, Type newType, uint requested, bool enforceAttributes)
 {
     Scope scope(o->engine());
@@ -161,6 +168,8 @@ void ArrayData::realloc(Object *o, Type newType, uint requested, bool enforceAtt
     }
     newData->setAlloc(alloc);
     newData->setType(newType);
+    if (d)
+        newData->d()->needsMark = d->d()->needsMark;
     newData->setAttrs(enforceAttributes ? reinterpret_cast<PropertyAttributes *>(newData->d()->values.values + alloc) : 0);
     o->setArrayData(newData);
 
@@ -183,6 +192,8 @@ void ArrayData::realloc(Object *o, Type newType, uint requested, bool enforceAtt
         memcpy(newData->d()->values.values, d->d()->values.values + offset, sizeof(Value)*toCopy);
     }
 
+    if (newType != Heap::ArrayData::Simple)
+        newData->d()->needsMark = true;
     if (newType != Heap::ArrayData::Sparse)
         return;
 
@@ -672,15 +683,14 @@ bool ArrayElementLessThan::operator()(Value v1, Value v2) const
         return false;
     if (v2.isUndefined() || v2.isEmpty())
         return true;
-    ScopedObject o(scope, m_comparefn);
+    ScopedFunctionObject o(scope, m_comparefn);
     if (o) {
         Scope scope(o->engine());
         ScopedValue result(scope);
-        ScopedCallData callData(scope, 2);
-        callData->thisObject = Primitive::undefinedValue();
-        callData->args[0] = v1;
-        callData->args[1] = v2;
-        result = QV4::Runtime::method_callValue(scope.engine, m_comparefn, callData);
+        JSCallData jsCallData(scope, 2);
+        jsCallData->args[0] = v1;
+        jsCallData->args[1] = v2;
+        result = o->call(jsCallData);
 
         return result->toNumber() < 0;
     }
@@ -754,7 +764,7 @@ void ArrayData::sort(ExecutionEngine *engine, Object *thisObject, const Value &c
     if (!arrayData || !arrayData->length())
         return;
 
-    if (!(comparefn.isUndefined() || comparefn.as<Object>())) {
+    if (!comparefn.isUndefined() && !comparefn.isFunctionObject()) {
         engine->throwTypeError();
         return;
     }
@@ -833,7 +843,7 @@ void ArrayData::sort(ExecutionEngine *engine, Object *thisObject, const Value &c
     }
 
 
-    ArrayElementLessThan lessThan(engine, thisObject, comparefn);
+    ArrayElementLessThan lessThan(engine, thisObject, static_cast<const FunctionObject &>(comparefn));
 
     Value *begin = thisObject->arrayData()->values.values;
     sortHelper(begin, begin + len, *begin, lessThan);
diff --git a/src/qml/jsruntime/qv4arraydata_p.h b/src/qml/jsruntime/qv4arraydata_p.h
index e1de2e82e6..db9db5a220 100644
--- a/src/qml/jsruntime/qv4arraydata_p.h
+++ b/src/qml/jsruntime/qv4arraydata_p.h
@@ -91,7 +91,8 @@ struct ArrayVTable
 namespace Heap {
 
 #define ArrayDataMembers(class, Member) \
-    Member(class, NoMark, uint, type) \
+    Member(class, NoMark, ushort, type) \
+    Member(class, NoMark, ushort, needsMark) \
     Member(class, NoMark, uint, offset) \
     Member(class, NoMark, PropertyAttributes *, attrs) \
     Member(class, NoMark, ReturnedValue, freeList) \
@@ -99,7 +100,7 @@ namespace Heap {
     Member(class, ValueArray, ValueArray, values)
 
 DECLARE_HEAP_OBJECT(ArrayData, Base) {
-    DECLARE_MARK_TABLE(ArrayData);
+    static void markObjects(Heap::Base *base, MarkStack *stack);
 
     enum Type { Simple = 0, Complex = 1, Sparse = 2, Custom = 3 };
 
@@ -144,9 +145,11 @@ DECLARE_HEAP_OBJECT(ArrayData, Base) {
 V4_ASSERT_IS_TRIVIAL(ArrayData)
 
 struct SimpleArrayData : public ArrayData {
-    uint mappedIndex(uint index) const { return (index + offset) % values.alloc; }
+    uint mappedIndex(uint index) const { index += offset; if (index >= values.alloc) index -= values.alloc; return index; }
     const Value &data(uint index) const { return values[mappedIndex(index)]; }
     void setData(EngineBase *e, uint index, Value newVal) {
+        if (newVal.isManaged())
+            needsMark = true;
         values.set(e, mappedIndex(index), newVal);
     }
 
diff --git a/src/qml/jsruntime/qv4arrayobject.cpp b/src/qml/jsruntime/qv4arrayobject.cpp
index a2c19e1f2d..bd019d3bcb 100644
--- a/src/qml/jsruntime/qv4arrayobject.cpp
+++ b/src/qml/jsruntime/qv4arrayobject.cpp
@@ -40,7 +40,7 @@
 #include "qv4arrayobject_p.h"
 #include "qv4sparsearray_p.h"
 #include "qv4objectproto_p.h"
-#include "qv4scopedvalue_p.h"
+#include "qv4jscall_p.h"
 #include "qv4argumentsobject_p.h"
 #include "qv4runtime_p.h"
 #include "qv4string_p.h"
@@ -55,35 +55,34 @@ void Heap::ArrayCtor::init(QV4::ExecutionContext *scope)
     Heap::FunctionObject::init(scope, QStringLiteral("Array"));
 }
 
-void ArrayCtor::construct(const Managed *m, Scope &scope, CallData *callData)
+ReturnedValue ArrayCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    ExecutionEngine *v4 = static_cast<const ArrayCtor *>(m)->engine();
+    ExecutionEngine *v4 = static_cast<const ArrayCtor *>(f)->engine();
+    Scope scope(v4);
     ScopedArrayObject a(scope, v4->newArrayObject());
     uint len;
-    if (callData->argc == 1 && callData->args[0].isNumber()) {
+    if (argc == 1 && argv[0].isNumber()) {
         bool ok;
-        len = callData->args[0].asArrayLength(&ok);
+        len = argv[0].asArrayLength(&ok);
 
-        if (!ok) {
-            scope.result = v4->throwRangeError(callData->args[0]);
-            return;
-        }
+        if (!ok)
+            return v4->throwRangeError(argv[0]);
 
         if (len < 0x1000)
             a->arrayReserve(len);
     } else {
-        len = callData->argc;
+        len = argc;
         a->arrayReserve(len);
-        a->arrayPut(0, callData->args, len);
+        a->arrayPut(0, argv, len);
     }
     a->setArrayLengthUnchecked(len);
 
-    scope.result = a.asReturnedValue();
+    return a.asReturnedValue();
 }
 
-void ArrayCtor::call(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue ArrayCtor::call(const FunctionObject *f, const Value *, const Value *argv, int argc)
 {
-    construct(that, scope, callData);
+    return callAsConstructor(f, argv, argc);
 }
 
 void ArrayPrototype::init(ExecutionEngine *engine, Object *ctor)
@@ -119,35 +118,35 @@ void ArrayPrototype::init(ExecutionEngine *engine, Object *ctor)
     defineDefaultProperty(QStringLiteral("reduceRight"), method_reduceRight, 1);
 }
 
-void ArrayPrototype::method_isArray(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_isArray(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    bool isArray = callData->argc && callData->args[0].as<ArrayObject>();
-    scope.result = Encode(isArray);
+    bool isArray = argc && argv[0].as<ArrayObject>();
+    return Encode(isArray);
 }
 
-void ArrayPrototype::method_toString(const BuiltinFunction *builtin, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_toString(const FunctionObject *builtin, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->thisObject, ScopedObject::Convert);
-    CHECK_EXCEPTION();
-    ScopedString s(scope, scope.engine->newString(QStringLiteral("join")));
-    ScopedFunctionObject f(scope, o->get(s));
-    if (!!f) {
-        ScopedCallData d(scope, 0);
-        d->thisObject = callData->thisObject;
-        f->call(scope, d);
-        return;
-    }
-    ObjectPrototype::method_toString(builtin, scope, callData);
+    Scope scope(builtin);
+    ScopedObject that(scope, thisObject->toObject(scope.engine));
+    if (scope.hasException())
+        return QV4::Encode::undefined();
+
+    ScopedString string(scope, scope.engine->newString(QStringLiteral("join")));
+    ScopedFunctionObject f(scope, that->get(string));
+    if (f)
+        return f->call(that, argv, argc);
+    return ObjectPrototype::method_toString(builtin, that, argv, argc);
 }
 
-void ArrayPrototype::method_toLocaleString(const BuiltinFunction *builtin, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_toLocaleString(const FunctionObject *builtin, const Value *thisObject, const Value *argv, int argc)
 {
-    return method_toString(builtin, scope, callData);
+    return method_toString(builtin, thisObject, argv, argc);
 }
 
-void ArrayPrototype::method_concat(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_concat(const FunctionObject *b, const Value *that, const Value *argv, int argc)
 {
-    ScopedObject thisObject(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject thisObject(scope, that->toObject(scope.engine));
     if (!thisObject)
         RETURN_UNDEFINED();
 
@@ -162,9 +161,9 @@ void ArrayPrototype::method_concat(const BuiltinFunction *, Scope &scope, CallDa
     ScopedArrayObject elt(scope);
     ScopedObject eltAsObj(scope);
     ScopedValue entry(scope);
-    for (int i = 0; i < callData->argc; ++i) {
-        eltAsObj = callData->args[i];
-        elt = callData->args[i];
+    for (int i = 0, ei = argc; i < ei; ++i) {
+        eltAsObj = argv[i];
+        elt = argv[i];
         if (elt) {
             uint n = elt->getLength();
             uint newLen = ArrayData::append(result, elt, n);
@@ -173,93 +172,94 @@ void ArrayPrototype::method_concat(const BuiltinFunction *, Scope &scope, CallDa
             const uint startIndex = result->getLength();
             for (int i = 0, len = eltAsObj->getLength(); i < len; ++i) {
                 entry = eltAsObj->getIndexed(i);
+                // spec says not to throw if this fails
                 result->putIndexed(startIndex + i, entry);
             }
         } else {
-            result->arraySet(result->getLength(), callData->args[i]);
+            result->arraySet(result->getLength(), argv[i]);
         }
     }
 
-    scope.result = result;
+    return result.asReturnedValue();
 }
 
-void ArrayPrototype::method_find(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_find(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
 
-    ScopedFunctionObject callback(scope, callData->argument(0));
-    if (!callback)
+    if (!argc || !argv[0].isFunctionObject())
         THROW_TYPE_ERROR();
+    const FunctionObject *callback = static_cast<const FunctionObject *>(argv);
 
-    ScopedCallData cData(scope, 3);
-    cData->thisObject = callData->argument(1);
-    cData->args[2] = instance;
+    ScopedValue result(scope);
+    Value *arguments = scope.alloc(3);
 
-    ScopedValue v(scope);
+    ScopedValue that(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
 
     for (uint k = 0; k < len; ++k) {
-        v = instance->getIndexed(k);
+        arguments[0] = instance->getIndexed(k);
         CHECK_EXCEPTION();
 
-        cData->args[0] = v;
-        cData->args[1] = Primitive::fromDouble(k);
-        callback->call(scope, cData);
+        arguments[1] = Primitive::fromDouble(k);
+        arguments[2] = instance;
+        result = callback->call(that, arguments, 3);
 
         CHECK_EXCEPTION();
-        if (scope.result.toBoolean())
-            RETURN_RESULT(v);
+        if (result->toBoolean())
+            return arguments[0].asReturnedValue();
     }
 
     RETURN_UNDEFINED();
 }
 
-void ArrayPrototype::method_findIndex(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_findIndex(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
 
-    ScopedFunctionObject callback(scope, callData->argument(0));
-    if (!callback)
+    if (!argc || !argv[0].isFunctionObject())
         THROW_TYPE_ERROR();
+    const FunctionObject *callback = static_cast<const FunctionObject *>(argv);
 
-    ScopedCallData cData(scope, 3);
-    cData->thisObject = callData->argument(1);
-    cData->args[2] = instance;
+    ScopedValue result(scope);
+    Value *arguments = scope.alloc(3);
 
-    ScopedValue v(scope);
+    ScopedValue that(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
 
     for (uint k = 0; k < len; ++k) {
-        v = instance->getIndexed(k);
+        arguments[0] = instance->getIndexed(k);
         CHECK_EXCEPTION();
 
-        cData->args[0] = v;
-        cData->args[1] = Primitive::fromDouble(k);
-        callback->call(scope, cData);
+        arguments[1] = Primitive::fromDouble(k);
+        arguments[2] = instance;
+        result = callback->call(that, arguments, 3);
 
         CHECK_EXCEPTION();
-        if (scope.result.toBoolean())
-            RETURN_RESULT(Encode(k));
+        if (result->toBoolean())
+            return Encode(k);
     }
 
-    RETURN_RESULT(Encode(-1));
+    return Encode(-1);
 }
 
-void ArrayPrototype::method_join(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_join(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedValue arg(scope, callData->argument(0));
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
 
-    if (!instance) {
-        scope.result = scope.engine->newString();
-        return;
-    }
+    if (!instance)
+        return Encode(scope.engine->newString());
+
+    ScopedValue arg(scope, argc ? argv[0] : Primitive::undefinedValue());
 
     QString r4;
     if (arg->isUndefined())
@@ -270,10 +270,8 @@ void ArrayPrototype::method_join(const BuiltinFunction *, Scope &scope, CallData
     ScopedValue length(scope, instance->get(scope.engine->id_length()));
     const quint32 r2 = length->isUndefined() ? 0 : length->toUInt32();
 
-    if (!r2) {
-        scope.result = scope.engine->newString();
-        return;
-    }
+    if (!r2)
+        return Encode(scope.engine->newString());
 
     QString R;
 
@@ -311,12 +309,13 @@ void ArrayPrototype::method_join(const BuiltinFunction *, Scope &scope, CallData
         }
     }
 
-    scope.result = scope.engine->newString(R);
+    return Encode(scope.engine->newString(R));
 }
 
-void ArrayPrototype::method_pop(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_pop(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
@@ -331,19 +330,22 @@ void ArrayPrototype::method_pop(const BuiltinFunction *, Scope &scope, CallData
     ScopedValue result(scope, instance->getIndexed(len - 1));
     CHECK_EXCEPTION();
 
-    instance->deleteIndexedProperty(len - 1);
-    CHECK_EXCEPTION();
+    if (!instance->deleteIndexedProperty(len - 1))
+        return scope.engine->throwTypeError();
 
     if (instance->isArrayObject())
         instance->setArrayLength(len - 1);
-    else
-        instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(len - 1)));
-    scope.result = result;
+    else {
+        if (!instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(len - 1))))
+            return scope.engine->throwTypeError();
+    }
+    return result->asReturnedValue();
 }
 
-void ArrayPrototype::method_push(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_push(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
@@ -352,47 +354,52 @@ void ArrayPrototype::method_push(const BuiltinFunction *, Scope &scope, CallData
 
     uint len = instance->getLength();
 
-    if (len + callData->argc < len) {
-        // ughh...
+    if (len + argc < len) {
+        // ughh... this goes beyond UINT_MAX
         double l = len;
         ScopedString s(scope);
-        for (int i = 0; i < callData->argc; ++i) {
+        for (int i = 0, ei = argc; i < ei; ++i) {
             s = Primitive::fromDouble(l + i).toString(scope.engine);
-            instance->put(s, callData->args[i]);
+            if (!instance->put(s, argv[i]))
+                return scope.engine->throwTypeError();
         }
-        double newLen = l + callData->argc;
-        if (!instance->isArrayObject())
-            instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(newLen)));
-        else {
+        double newLen = l + argc;
+        if (!instance->isArrayObject()) {
+            if (!instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(newLen))))
+                return scope.engine->throwTypeError();
+        } else {
             ScopedString str(scope, scope.engine->newString(QStringLiteral("Array.prototype.push: Overflow")));
-            scope.result = scope.engine->throwRangeError(str);
-            return;
+            return scope.engine->throwRangeError(str);
         }
-        scope.result = Encode(newLen);
-        return;
+        return Encode(newLen);
     }
 
-    if (!callData->argc)
+    if (!argc)
         ;
     else if (!instance->protoHasArray() && instance->arrayData()->length() <= len && instance->arrayData()->type == Heap::ArrayData::Simple) {
-        instance->arrayData()->vtable()->putArray(instance, len, callData->args, callData->argc);
+        instance->arrayData()->vtable()->putArray(instance, len, argv, argc);
         len = instance->arrayData()->length();
     } else {
-        for (int i = 0; i < callData->argc; ++i)
-            instance->putIndexed(len + i, callData->args[i]);
-        len += callData->argc;
+        for (int i = 0, ei = argc; i < ei; ++i) {
+            if (!instance->putIndexed(len + i, argv[i]))
+                return scope.engine->throwTypeError();
+        }
+        len += argc;
     }
     if (instance->isArrayObject())
         instance->setArrayLengthUnchecked(len);
-    else
-        instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(len)));
+    else {
+        if (!instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(len))))
+            return scope.engine->throwTypeError();
+    }
 
-    scope.result = Encode(len);
+    return Encode(len);
 }
 
-void ArrayPrototype::method_reverse(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_reverse(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
@@ -407,22 +414,27 @@ void ArrayPrototype::method_reverse(const BuiltinFunction *, Scope &scope, CallD
         lval = instance->getIndexed(lo, &loExists);
         hval = instance->getIndexed(hi, &hiExists);
         CHECK_EXCEPTION();
+        bool ok;
         if (hiExists)
-            instance->putIndexed(lo, hval);
-        else
-            instance->deleteIndexedProperty(lo);
-        CHECK_EXCEPTION();
-        if (loExists)
-            instance->putIndexed(hi, lval);
+            ok = instance->putIndexed(lo, hval);
         else
-            instance->deleteIndexedProperty(hi);
+            ok = instance->deleteIndexedProperty(lo);
+        if (ok) {
+            if (loExists)
+                ok = instance->putIndexed(hi, lval);
+            else
+                ok = instance->deleteIndexedProperty(hi);
+        }
+        if (!ok)
+            return scope.engine->throwTypeError();
     }
-    scope.result = instance;
+    return instance->asReturnedValue();
 }
 
-void ArrayPrototype::method_shift(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_shift(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
@@ -433,14 +445,16 @@ void ArrayPrototype::method_shift(const BuiltinFunction *, Scope &scope, CallDat
 
     if (!len) {
         if (!instance->isArrayObject())
-            instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromInt32(0)));
+            if (!instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromInt32(0))))
+                return scope.engine->throwTypeError();
         RETURN_UNDEFINED();
     }
 
+    ScopedValue result(scope);
     if (!instance->protoHasArray() && !instance->arrayData()->attrs && instance->arrayData()->length() <= len && instance->arrayData()->type != Heap::ArrayData::Custom) {
-        scope.result = instance->arrayData()->vtable()->pop_front(instance);
+        result = instance->arrayData()->vtable()->pop_front(instance);
     } else {
-        scope.result = instance->getIndexed(0);
+        result = instance->getIndexed(0);
         CHECK_EXCEPTION();
         ScopedValue v(scope);
         // do it the slow way
@@ -448,31 +462,40 @@ void ArrayPrototype::method_shift(const BuiltinFunction *, Scope &scope, CallDat
             bool exists;
             v = instance->getIndexed(k, &exists);
             CHECK_EXCEPTION();
+            bool ok;
             if (exists)
-                instance->putIndexed(k - 1, v);
+                ok = instance->putIndexed(k - 1, v);
             else
-                instance->deleteIndexedProperty(k - 1);
-            CHECK_EXCEPTION();
+                ok = instance->deleteIndexedProperty(k - 1);
+            if (!ok)
+                return scope.engine->throwTypeError();
         }
-        instance->deleteIndexedProperty(len - 1);
-        CHECK_EXCEPTION();
+        bool ok = instance->deleteIndexedProperty(len - 1);
+        if (!ok)
+            return scope.engine->throwTypeError();
     }
 
     if (instance->isArrayObject())
         instance->setArrayLengthUnchecked(len - 1);
-    else
-        instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(len - 1)));
+    else {
+        bool ok = instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(len - 1)));
+        if (!ok)
+            return scope.engine->throwTypeError();
+    }
+
+    return result->asReturnedValue();
 }
 
-void ArrayPrototype::method_slice(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_slice(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject o(scope, thisObject->toObject(scope.engine));
     if (!o)
         RETURN_UNDEFINED();
 
     ScopedArrayObject result(scope, scope.engine->newArrayObject());
     uint len = o->getLength();
-    double s = ScopedValue(scope, callData->argument(0))->toInteger();
+    double s = (argc ? argv[0] : Primitive::undefinedValue()).toInteger();
     uint start;
     if (s < 0)
         start = (uint)qMax(len + s, 0.);
@@ -481,8 +504,8 @@ void ArrayPrototype::method_slice(const BuiltinFunction *, Scope &scope, CallDat
     else
         start = (uint) s;
     uint end = len;
-    if (callData->argc > 1 && !callData->args[1].isUndefined()) {
-        double e = callData->args[1].toInteger();
+    if (argc > 1 && !argv[1].isUndefined()) {
+        double e = argv[1].toInteger();
         if (e < 0)
             end = (uint)qMax(len + e, 0.);
         else if (e > len)
@@ -501,25 +524,27 @@ void ArrayPrototype::method_slice(const BuiltinFunction *, Scope &scope, CallDat
             result->arraySet(n, v);
         ++n;
     }
-    scope.result = result;
+    return result->asReturnedValue();
 }
 
-void ArrayPrototype::method_sort(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_sort(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
 
-    ScopedValue comparefn(scope, callData->argument(0));
+    ScopedValue comparefn(scope, argc ? argv[0] : Primitive::undefinedValue());
     ArrayData::sort(scope.engine, instance, comparefn, len);
-    scope.result = callData->thisObject;
+    return thisObject->asReturnedValue();
 }
 
-void ArrayPrototype::method_splice(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_splice(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
@@ -527,14 +552,14 @@ void ArrayPrototype::method_splice(const BuiltinFunction *, Scope &scope, CallDa
 
     ScopedArrayObject newArray(scope, scope.engine->newArrayObject());
 
-    double rs = ScopedValue(scope, callData->argument(0))->toInteger();
+    double rs = (argc ? argv[0] : Primitive::undefinedValue()).toInteger();
     uint start;
     if (rs < 0)
         start = (uint) qMax(0., len + rs);
     else
         start = (uint) qMin(rs, (double)len);
 
-    uint deleteCount = (uint)qMin(qMax(ScopedValue(scope, callData->argument(1))->toInteger(), 0.), (double)(len - start));
+    uint deleteCount = (uint)qMin(qMax((argc > 1 ? argv[1] : Primitive::undefinedValue()).toInteger(), 0.), (double)(len - start));
 
     newArray->arrayReserve(deleteCount);
     ScopedValue v(scope);
@@ -547,22 +572,24 @@ void ArrayPrototype::method_splice(const BuiltinFunction *, Scope &scope, CallDa
     }
     newArray->setArrayLengthUnchecked(deleteCount);
 
-    uint itemCount = callData->argc < 2 ? 0 : callData->argc - 2;
+    uint itemCount = argc < 2 ? 0 : argc - 2;
 
     if (itemCount < deleteCount) {
         for (uint k = start; k < len - deleteCount; ++k) {
             bool exists;
             v = instance->getIndexed(k + deleteCount, &exists);
             CHECK_EXCEPTION();
+            bool ok;
             if (exists)
-                instance->putIndexed(k + itemCount, v);
+                ok = instance->putIndexed(k + itemCount, v);
             else
-                instance->deleteIndexedProperty(k + itemCount);
-            CHECK_EXCEPTION();
+                ok = instance->deleteIndexedProperty(k + itemCount);
+            if (!ok)
+                return scope.engine->throwTypeError();
         }
         for (uint k = len; k > len - deleteCount + itemCount; --k) {
-            instance->deleteIndexedProperty(k - 1);
-            CHECK_EXCEPTION();
+            if (!instance->deleteIndexedProperty(k - 1))
+                return scope.engine->throwTypeError();
         }
     } else if (itemCount > deleteCount) {
         uint k = len - deleteCount;
@@ -570,31 +597,30 @@ void ArrayPrototype::method_splice(const BuiltinFunction *, Scope &scope, CallDa
             bool exists;
             v = instance->getIndexed(k + deleteCount - 1, &exists);
             CHECK_EXCEPTION();
+            bool ok;
             if (exists)
-                instance->putIndexed(k + itemCount - 1, v);
+                ok = instance->putIndexed(k + itemCount - 1, v);
             else
-                instance->deleteIndexedProperty(k + itemCount - 1);
-            CHECK_EXCEPTION();
+                ok = instance->deleteIndexedProperty(k + itemCount - 1);
+            if (!ok)
+                return scope.engine->throwTypeError();
             --k;
         }
     }
 
-    for (uint i = 0; i < itemCount; ++i) {
-        instance->putIndexed(start + i, callData->args[i + 2]);
-        CHECK_EXCEPTION();
-    }
+    for (uint i = 0; i < itemCount; ++i)
+        instance->putIndexed(start + i, argv[i + 2]);
 
-    bool wasStrict = scope.engine->current->strictMode;
-    scope.engine->current->strictMode = true;
-    instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(len - deleteCount + itemCount)));
+    if (!instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(len - deleteCount + itemCount))))
+        return scope.engine->throwTypeError();
 
-    scope.result = newArray;
-    scope.engine->current->strictMode = wasStrict;
+    return newArray->asReturnedValue();
 }
 
-void ArrayPrototype::method_unshift(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_unshift(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
@@ -605,52 +631,57 @@ void ArrayPrototype::method_unshift(const BuiltinFunction *, Scope &scope, CallD
 
     if (!instance->protoHasArray() && !instance->arrayData()->attrs && instance->arrayData()->length() <= len &&
         instance->arrayData()->type != Heap::ArrayData::Custom) {
-        instance->arrayData()->vtable()->push_front(instance, callData->args, callData->argc);
+        instance->arrayData()->vtable()->push_front(instance, argv, argc);
     } else {
         ScopedValue v(scope);
         for (uint k = len; k > 0; --k) {
             bool exists;
             v = instance->getIndexed(k - 1, &exists);
+            bool ok;
             if (exists)
-                instance->putIndexed(k + callData->argc - 1, v);
+                ok = instance->putIndexed(k + argc - 1, v);
             else
-                instance->deleteIndexedProperty(k + callData->argc - 1);
+                ok = instance->deleteIndexedProperty(k + argc - 1);
+            if (!ok)
+                return scope.engine->throwTypeError();
+        }
+        for (int i = 0, ei = argc; i < ei; ++i) {
+            bool ok = instance->putIndexed(i, argv[i]);
+            if (!ok)
+                return scope.engine->throwTypeError();
         }
-        for (int i = 0; i < callData->argc; ++i)
-            instance->putIndexed(i, callData->args[i]);
     }
 
-    uint newLen = len + callData->argc;
+    uint newLen = len + argc;
     if (instance->isArrayObject())
         instance->setArrayLengthUnchecked(newLen);
-    else
-        instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(newLen)));
+    else {
+        if (!instance->put(scope.engine->id_length(), ScopedValue(scope, Primitive::fromDouble(newLen))))
+            return scope.engine->throwTypeError();
+    }
 
-    scope.result = Encode(newLen);
+    return Encode(newLen);
 }
 
-void ArrayPrototype::method_indexOf(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_indexOf(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
-    if (!len) {
-        scope.result = Encode(-1);
-        return;
-    }
+    if (!len)
+        return Encode(-1);
 
-    ScopedValue searchValue(scope, callData->argument(0));
+    ScopedValue searchValue(scope, argc ? argv[0] : Primitive::undefinedValue());
     uint fromIndex = 0;
 
-    if (callData->argc >= 2) {
-        double f = callData->args[1].toInteger();
+    if (argc >= 2) {
+        double f = argv[1].toInteger();
         CHECK_EXCEPTION();
-        if (f >= len) {
-            scope.result = Encode(-1);
-            return;
-        }
+        if (f >= len)
+            return Encode(-1);
         if (f < 0)
             f = qMax(len + f, 0.);
         fromIndex = (uint) f;
@@ -661,13 +692,10 @@ void ArrayPrototype::method_indexOf(const BuiltinFunction *, Scope &scope, CallD
         for (uint k = fromIndex; k < len; ++k) {
             bool exists;
             v = instance->getIndexed(k, &exists);
-            if (exists && RuntimeHelpers::strictEqual(v, searchValue)) {
-                scope.result = Encode(k);
-                return;
-            }
+            if (exists && RuntimeHelpers::strictEqual(v, searchValue))
+                return Encode(k);
         }
-        scope.result = Encode(-1);
-        return;
+        return Encode(-1);
     }
 
     ScopedValue value(scope);
@@ -679,14 +707,11 @@ void ArrayPrototype::method_indexOf(const BuiltinFunction *, Scope &scope, CallD
             bool exists;
             value = instance->getIndexed(i, &exists);
             CHECK_EXCEPTION();
-            if (exists && RuntimeHelpers::strictEqual(value, searchValue)) {
-                scope.result = Encode(i);
-                return;
-            }
+            if (exists && RuntimeHelpers::strictEqual(value, searchValue))
+                return Encode(i);
         }
     } else if (!instance->arrayData()) {
-        scope.result = Encode(-1);
-        return;
+        return Encode(-1);
     } else {
         Q_ASSERT(instance->arrayType() == Heap::ArrayData::Simple || instance->arrayType() == Heap::ArrayData::Complex);
         Heap::SimpleArrayData *sa = instance->d()->arrayData.cast<Heap::SimpleArrayData>();
@@ -696,47 +721,42 @@ void ArrayPrototype::method_indexOf(const BuiltinFunction *, Scope &scope, CallD
         while (idx < len) {
             value = sa->data(idx);
             CHECK_EXCEPTION();
-            if (RuntimeHelpers::strictEqual(value, searchValue)) {
-                scope.result = Encode(idx);
-                return;
-            }
+            if (RuntimeHelpers::strictEqual(value, searchValue))
+                return Encode(idx);
             ++idx;
         }
     }
-    scope.result = Encode(-1);
+    return Encode(-1);
 }
 
-void ArrayPrototype::method_lastIndexOf(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_lastIndexOf(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
-    if (!len) {
-        scope.result = Encode(-1);
-        return;
-    }
+    if (!len)
+        return Encode(-1);
 
     ScopedValue searchValue(scope);
     uint fromIndex = len;
 
-    if (callData->argc >= 1)
-        searchValue = callData->argument(0);
+    if (argc >= 1)
+        searchValue = argv[0];
     else
         searchValue = Primitive::undefinedValue();
 
-    if (callData->argc >= 2) {
-        double f = callData->args[1].toInteger();
+    if (argc >= 2) {
+        double f = argv[1].toInteger();
         CHECK_EXCEPTION();
         if (f > 0)
             f = qMin(f, (double)(len - 1));
         else if (f < 0) {
             f = len + f;
-            if (f < 0) {
-                scope.result = Encode(-1);
-                return;
-            }
+            if (f < 0)
+                return Encode(-1);
         }
         fromIndex = (uint) f + 1;
     }
@@ -747,281 +767,277 @@ void ArrayPrototype::method_lastIndexOf(const BuiltinFunction *, Scope &scope, C
         bool exists;
         v = instance->getIndexed(k, &exists);
         CHECK_EXCEPTION();
-        if (exists && RuntimeHelpers::strictEqual(v, searchValue)) {
-            scope.result = Encode(k);
-            return;
-        }
+        if (exists && RuntimeHelpers::strictEqual(v, searchValue))
+            return Encode(k);
     }
-    scope.result = Encode(-1);
+    return Encode(-1);
 }
 
-void ArrayPrototype::method_every(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_every(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
 
-    ScopedFunctionObject callback(scope, callData->argument(0));
-    if (!callback)
+    if (!argc || !argv->isFunctionObject())
         THROW_TYPE_ERROR();
+    const FunctionObject *callback = static_cast<const FunctionObject *>(argv);
 
-    ScopedCallData cData(scope, 3);
-    cData->args[2] = instance;
-    cData->thisObject = callData->argument(1);
-    ScopedValue v(scope);
+    ScopedValue that(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
+    ScopedValue r(scope);
+    Value *arguments = scope.alloc(3);
 
     bool ok = true;
     for (uint k = 0; ok && k < len; ++k) {
         bool exists;
-        v = instance->getIndexed(k, &exists);
+        arguments[0] = instance->getIndexed(k, &exists);
         if (!exists)
             continue;
 
-        cData->args[0] = v;
-        cData->args[1] = Primitive::fromDouble(k);
-        callback->call(scope, cData);
-        ok = scope.result.toBoolean();
+        arguments[1] = Primitive::fromDouble(k);
+        arguments[2] = instance;
+        r = callback->call(that, arguments, 3);
+        ok = r->toBoolean();
     }
-    scope.result = Encode(ok);
+    return Encode(ok);
 }
 
-void ArrayPrototype::method_some(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_some(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
 
-    ScopedFunctionObject callback(scope, callData->argument(0));
-    if (!callback)
+    if (!argc || !argv->isFunctionObject())
         THROW_TYPE_ERROR();
+    const FunctionObject *callback = static_cast<const FunctionObject *>(argv);
 
-    ScopedCallData cData(scope, 3);
-    cData->thisObject = callData->argument(1);
-    cData->args[2] = instance;
-    ScopedValue v(scope);
+    ScopedValue that(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
+    ScopedValue result(scope);
+    Value *arguments = scope.alloc(3);
 
     for (uint k = 0; k < len; ++k) {
         bool exists;
-        v = instance->getIndexed(k, &exists);
+        arguments[0] = instance->getIndexed(k, &exists);
         if (!exists)
             continue;
 
-        cData->args[0] = v;
-        cData->args[1] = Primitive::fromDouble(k);
-        callback->call(scope, cData);
-        if (scope.result.toBoolean()) {
-            scope.result = Encode(true);
-            return;
-        }
+        arguments[1] = Primitive::fromDouble(k);
+        arguments[2] = instance;
+        result = callback->call(that, arguments, 3);
+        if (result->toBoolean())
+            return Encode(true);
     }
-    scope.result = Encode(false);
+    return Encode(false);
 }
 
-void ArrayPrototype::method_forEach(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_forEach(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
 
-    ScopedFunctionObject callback(scope, callData->argument(0));
-    if (!callback)
+    if (!argc || !argv->isFunctionObject())
         THROW_TYPE_ERROR();
+    const FunctionObject *callback = static_cast<const FunctionObject *>(argv);
 
-    ScopedCallData cData(scope, 3);
-    cData->thisObject = callData->argument(1);
-    cData->args[2] = instance;
+    ScopedValue that(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
+    Value *arguments = scope.alloc(3);
 
-    ScopedValue v(scope);
     for (uint k = 0; k < len; ++k) {
         bool exists;
-        v = instance->getIndexed(k, &exists);
+        arguments[0] = instance->getIndexed(k, &exists);
         if (!exists)
             continue;
 
-        cData->args[0] = v;
-        cData->args[1] = Primitive::fromDouble(k);
-        callback->call(scope, cData);
+        arguments[1] = Primitive::fromDouble(k);
+        arguments[2] = instance;
+        callback->call(that, arguments, 3);
     }
     RETURN_UNDEFINED();
 }
 
-void ArrayPrototype::method_map(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_map(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
 
-    ScopedFunctionObject callback(scope, callData->argument(0));
-    if (!callback)
+    if (!argc || !argv->isFunctionObject())
         THROW_TYPE_ERROR();
+    const FunctionObject *callback = static_cast<const FunctionObject *>(argv);
 
     ScopedArrayObject a(scope, scope.engine->newArrayObject());
     a->arrayReserve(len);
     a->setArrayLengthUnchecked(len);
 
-    ScopedCallData cData(scope, 3);
-    cData->thisObject = callData->argument(1);
-    cData->args[2] = instance;
-
     ScopedValue v(scope);
+    ScopedValue mapped(scope);
+    ScopedValue that(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
+    Value *arguments = scope.alloc(3);
+
     for (uint k = 0; k < len; ++k) {
         bool exists;
-        v = instance->getIndexed(k, &exists);
+        arguments[0] = instance->getIndexed(k, &exists);
         if (!exists)
             continue;
 
-        cData->args[0] = v;
-        cData->args[1] = Primitive::fromDouble(k);
-        callback->call(scope, cData);
-        a->arraySet(k, scope.result);
+        arguments[1] = Primitive::fromDouble(k);
+        arguments[2] = instance;
+        mapped = callback->call(that, arguments, 3);
+        a->arraySet(k, mapped);
     }
-    scope.result = a.asReturnedValue();
+    return a.asReturnedValue();
 }
 
-void ArrayPrototype::method_filter(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_filter(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
 
-    ScopedFunctionObject callback(scope, callData->argument(0));
-    if (!callback)
+    if (!argc || !argv->isFunctionObject())
         THROW_TYPE_ERROR();
+    const FunctionObject *callback = static_cast<const FunctionObject *>(argv);
 
     ScopedArrayObject a(scope, scope.engine->newArrayObject());
     a->arrayReserve(len);
 
-    ScopedCallData cData(scope, 3);
-    cData->thisObject = callData->argument(1);
-    cData->args[2] = instance;
-
-    ScopedValue v(scope);
+    ScopedValue selected(scope);
+    ScopedValue that(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
+    Value *arguments = scope.alloc(3);
 
     uint to = 0;
     for (uint k = 0; k < len; ++k) {
         bool exists;
-        v = instance->getIndexed(k, &exists);
+        arguments[0] = instance->getIndexed(k, &exists);
         if (!exists)
             continue;
 
-        cData->args[0] = v;
-        cData->args[1] = Primitive::fromDouble(k);
-        callback->call(scope, cData);
-        if (scope.result.toBoolean()) {
-            a->arraySet(to, v);
+        arguments[1] = Primitive::fromDouble(k);
+        arguments[2] = instance;
+        selected = callback->call(that, arguments, 3);
+        if (selected->toBoolean()) {
+            a->arraySet(to, arguments[0]);
             ++to;
         }
     }
-    scope.result = a.asReturnedValue();
+    return a.asReturnedValue();
 }
 
-void ArrayPrototype::method_reduce(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_reduce(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
 
-    ScopedFunctionObject callback(scope, callData->argument(0));
-    if (!callback)
+    if (!argc || !argv->isFunctionObject())
         THROW_TYPE_ERROR();
+    const FunctionObject *callback = static_cast<const FunctionObject *>(argv);
 
     uint k = 0;
+    ScopedValue acc(scope);
     ScopedValue v(scope);
 
-    if (callData->argc > 1) {
-        scope.result = callData->argument(1);
+    if (argc > 1) {
+        acc = argv[1];
     } else {
         bool kPresent = false;
         while (k < len && !kPresent) {
             v = instance->getIndexed(k, &kPresent);
             if (kPresent)
-                scope.result = v;
+                acc = v;
             ++k;
         }
         if (!kPresent)
             THROW_TYPE_ERROR();
     }
 
-    ScopedCallData cData(scope, 4);
-    cData->thisObject = Primitive::undefinedValue();
-    cData->args[0] = scope.result;
-    cData->args[3] = instance;
+    Value *arguments = scope.alloc(4);
 
     while (k < len) {
         bool kPresent;
         v = instance->getIndexed(k, &kPresent);
         if (kPresent) {
-            cData->args[0] = scope.result;
-            cData->args[1] = v;
-            cData->args[2] = Primitive::fromDouble(k);
-            callback->call(scope, cData);
+            arguments[0] = acc;
+            arguments[1] = v;
+            arguments[2] = Primitive::fromDouble(k);
+            arguments[3] = instance;
+            acc = callback->call(nullptr, arguments, 4);
         }
         ++k;
     }
+    return acc->asReturnedValue();
 }
 
-void ArrayPrototype::method_reduceRight(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ArrayPrototype::method_reduceRight(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject instance(scope, thisObject->toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
 
     uint len = instance->getLength();
 
-    ScopedFunctionObject callback(scope, callData->argument(0));
-    if (!callback)
+    if (!argc || !argv->isFunctionObject())
         THROW_TYPE_ERROR();
+    const FunctionObject *callback = static_cast<const FunctionObject *>(argv);
 
     if (len == 0) {
-        if (callData->argc == 1)
+        if (argc == 1)
             THROW_TYPE_ERROR();
-        scope.result = callData->argument(1);
-        return;
+        return argv[1].asReturnedValue();
     }
 
     uint k = len;
+    ScopedValue acc(scope);
     ScopedValue v(scope);
-    if (callData->argc > 1) {
-        scope.result = callData->argument(1);
+    if (argc > 1) {
+        acc = argv[1];
     } else {
         bool kPresent = false;
         while (k > 0 && !kPresent) {
             v = instance->getIndexed(k - 1, &kPresent);
             if (kPresent)
-                scope.result = v;
+                acc = v;
             --k;
         }
         if (!kPresent)
             THROW_TYPE_ERROR();
     }
 
-    ScopedCallData cData(scope, 4);
-    cData->thisObject = Primitive::undefinedValue();
-    cData->args[3] = instance;
+    Value *arguments = scope.alloc(4);
 
     while (k > 0) {
         bool kPresent;
         v = instance->getIndexed(k - 1, &kPresent);
         if (kPresent) {
-            cData->args[0] = scope.result;
-            cData->args[1] = v;
-            cData->args[2] = Primitive::fromDouble(k - 1);
-            callback->call(scope, cData);
+            arguments[0] = acc;
+            arguments[1] = v;
+            arguments[2] = Primitive::fromDouble(k - 1);
+            arguments[3] = instance;
+            acc = callback->call(nullptr, arguments, 4);
         }
         --k;
     }
-    scope.result = scope.result.asReturnedValue();
+    return acc->asReturnedValue();
 }
 
diff --git a/src/qml/jsruntime/qv4arrayobject_p.h b/src/qml/jsruntime/qv4arrayobject_p.h
index 689752433b..3825a600a2 100644
--- a/src/qml/jsruntime/qv4arrayobject_p.h
+++ b/src/qml/jsruntime/qv4arrayobject_p.h
@@ -70,38 +70,38 @@ struct ArrayCtor: FunctionObject
 {
     V4_OBJECT2(ArrayCtor, FunctionObject)
 
-    static void construct(const Managed *m, Scope &scope, CallData *callData);
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct ArrayPrototype: ArrayObject
 {
     void init(ExecutionEngine *engine, Object *ctor);
 
-    static void method_isArray(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_toString(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_toLocaleString(const BuiltinFunction *builtin, Scope &, CallData *callData);
-    static void method_concat(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_find(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_findIndex(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_join(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_pop(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_push(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_reverse(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_shift(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_slice(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_sort(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_splice(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_unshift(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_indexOf(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_lastIndexOf(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_every(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_some(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_forEach(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_map(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_filter(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_reduce(const BuiltinFunction *, Scope &, CallData *callData);
-    static void method_reduceRight(const BuiltinFunction *, Scope &, CallData *callData);
+    static ReturnedValue method_isArray(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toLocaleString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_concat(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_find(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_findIndex(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_join(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_pop(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_push(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_reverse(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_shift(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_slice(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_sort(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_splice(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_unshift(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_indexOf(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_lastIndexOf(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_every(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_some(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_forEach(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_map(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_filter(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_reduce(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_reduceRight(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 
diff --git a/src/qml/jsruntime/qv4booleanobject.cpp b/src/qml/jsruntime/qv4booleanobject.cpp
index c8e9ebb2dd..eb83f902db 100644
--- a/src/qml/jsruntime/qv4booleanobject.cpp
+++ b/src/qml/jsruntime/qv4booleanobject.cpp
@@ -50,16 +50,16 @@ void Heap::BooleanCtor::init(QV4::ExecutionContext *scope)
     Heap::FunctionObject::init(scope, QStringLiteral("Boolean"));
 }
 
-void BooleanCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue BooleanCtor::callAsConstructor(const FunctionObject *that, const Value *argv, int argc)
 {
-    bool n = callData->argc ? callData->args[0].toBoolean() : false;
-    scope.result = Encode(scope.engine->newBooleanObject(n));
+    bool n = argc ? argv[0].toBoolean() : false;
+    return Encode(that->engine()->newBooleanObject(n));
 }
 
-void BooleanCtor::call(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue BooleanCtor::call(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    bool value = callData->argc ? callData->args[0].toBoolean() : 0;
-    scope.result = Encode(value);
+    bool value = argc ? argv[0].toBoolean() : 0;
+    return Encode(value);
 }
 
 void BooleanPrototype::init(ExecutionEngine *engine, Object *ctor)
@@ -73,31 +73,39 @@ void BooleanPrototype::init(ExecutionEngine *engine, Object *ctor)
     defineDefaultProperty(engine->id_valueOf(), method_valueOf);
 }
 
-void BooleanPrototype::method_toString(const BuiltinFunction *, Scope &scope, CallData *callData)
+static bool value(const Value *thisObject, bool *exception)
 {
-    bool result;
-    if (callData->thisObject.isBoolean()) {
-        result = callData->thisObject.booleanValue();
+    *exception = false;
+    if (thisObject->isBoolean()) {
+        return thisObject->booleanValue();
     } else {
-        const BooleanObject *thisObject = callData->thisObject.as<BooleanObject>();
-        if (!thisObject)
-            THROW_TYPE_ERROR();
-        result = thisObject->value();
+        const BooleanObject *that = thisObject->as<BooleanObject>();
+        if (that)
+            return that->value();
     }
+    *exception = true;
+    return false;
+}
+
+ReturnedValue BooleanPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int)
+{
+    bool exception;
+    bool result = ::value(thisObject, &exception);
+    ExecutionEngine *v4 = b->engine();
+    if (exception)
+        return v4->throwTypeError();
 
-    scope.result = result ? scope.engine->id_true() : scope.engine->id_false();
+    return Encode(result ? v4->id_true() : v4->id_false());
 }
 
-void BooleanPrototype::method_valueOf(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue BooleanPrototype::method_valueOf(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    if (callData->thisObject.isBoolean()) {
-        scope.result = callData->thisObject.asReturnedValue();
-        return;
+    bool exception;
+    bool result = ::value(thisObject, &exception);
+    if (exception) {
+        ExecutionEngine *v4 = b->engine();
+        return v4->throwTypeError();
     }
 
-    const BooleanObject *thisObject = callData->thisObject.as<BooleanObject>();
-    if (!thisObject)
-        THROW_TYPE_ERROR();
-
-    scope.result = Encode(thisObject->value());
+    return Encode(result);
 }
diff --git a/src/qml/jsruntime/qv4booleanobject_p.h b/src/qml/jsruntime/qv4booleanobject_p.h
index ca2cf7d17a..3cf09b2667 100644
--- a/src/qml/jsruntime/qv4booleanobject_p.h
+++ b/src/qml/jsruntime/qv4booleanobject_p.h
@@ -70,8 +70,8 @@ struct BooleanCtor: FunctionObject
 {
     V4_OBJECT2(BooleanCtor, FunctionObject)
 
-    static void construct(const Managed *, Scope &scope, CallData *callData);
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct BooleanPrototype: BooleanObject
@@ -79,8 +79,8 @@ struct BooleanPrototype: BooleanObject
     V4_PROTOTYPE(objectPrototype)
     void init(ExecutionEngine *engine, Object *ctor);
 
-    static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_valueOf(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_valueOf(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 
diff --git a/src/qml/jsruntime/qv4context.cpp b/src/qml/jsruntime/qv4context.cpp
index 6807c835b0..00d816fe91 100644
--- a/src/qml/jsruntime/qv4context.cpp
+++ b/src/qml/jsruntime/qv4context.cpp
@@ -48,59 +48,52 @@
 #include "qv4errorobject_p.h"
 #include "qv4string_p.h"
 #include "qv4qmlcontext_p.h"
-#include "qv4profiling_p.h"
-#include <private/qqmljavascriptexpression_p.h>
 
 using namespace QV4;
 
 DEFINE_MANAGED_VTABLE(ExecutionContext);
-DEFINE_MANAGED_VTABLE(SimpleCallContext);
 DEFINE_MANAGED_VTABLE(CallContext);
-DEFINE_MANAGED_VTABLE(WithContext);
 DEFINE_MANAGED_VTABLE(CatchContext);
-DEFINE_MANAGED_VTABLE(GlobalContext);
 
-Heap::CallContext *ExecutionContext::newCallContext(Function *function, CallData *callData)
+Heap::CallContext *ExecutionContext::newCallContext(CppStackFrame *frame)
 {
-    uint localsAndFormals = function->compiledFunction->nLocals + sizeof(CallData)/sizeof(Value) - 1 + qMax(static_cast<uint>(callData->argc), function->nFormals);
-    size_t requiredMemory = sizeof(CallContext::Data) - sizeof(Value) + sizeof(Value) * (localsAndFormals);
-
-    ExecutionEngine *v4 = engine();
-    Heap::CallContext *c = v4->memoryManager->allocManaged<CallContext>(requiredMemory);
-    c->init(Heap::ExecutionContext::Type_CallContext);
+    Function *function = frame->v4Function;
+    Heap::ExecutionContext *outer = static_cast<Heap::ExecutionContext *>(frame->context()->m());
 
-    c->v4Function = function;
+    uint nFormals = qMax(static_cast<uint>(frame->originalArgumentsCount), function->nFormals);
+    uint localsAndFormals = function->compiledFunction->nLocals + nFormals;
+    size_t requiredMemory = sizeof(CallContext::Data) - sizeof(Value) + sizeof(Value) * (localsAndFormals);
 
-    c->strictMode = function->isStrict();
-    c->outer.set(v4, this->d());
+    ExecutionEngine *v4 = outer->internalClass->engine;
+    Heap::CallContext *c = v4->memoryManager->allocManaged<CallContext>(requiredMemory, function->internalClass);
+    c->init();
 
-    c->compilationUnit = function->compilationUnit;
-    c->lookups = function->compilationUnit->runtimeLookups;
-    c->constantTable = function->compilationUnit->constants;
+    c->outer.set(v4, outer);
+    c->function.set(v4, static_cast<Heap::FunctionObject *>(frame->jsFrame->function.m()));
 
     const CompiledData::Function *compiledFunction = function->compiledFunction;
     uint nLocals = compiledFunction->nLocals;
     c->locals.size = nLocals;
     c->locals.alloc = localsAndFormals;
-#if QT_POINTER_SIZE == 8
-    // memory allocated from the JS heap is 0 initialized, so skip the std::fill() below
+    // memory allocated from the JS heap is 0 initialized, so check if undefined is 0
     Q_ASSERT(Primitive::undefinedValue().asReturnedValue() == 0);
-#else
-    if (nLocals)
-        std::fill(c->locals.values, c->locals.values + nLocals, Primitive::undefinedValue());
-#endif
 
-    c->callData = reinterpret_cast<CallData *>(c->locals.values + nLocals);
-    ::memcpy(c->callData, callData, sizeof(CallData) - sizeof(Value) + static_cast<uint>(callData->argc) * sizeof(Value));
-    if (callData->argc < static_cast<int>(compiledFunction->nFormals))
-        std::fill(c->callData->args + c->callData->argc, c->callData->args + compiledFunction->nFormals, Primitive::undefinedValue());
+    Value *args = c->locals.values + nLocals;
+    ::memcpy(args, frame->originalArguments, frame->originalArgumentsCount * sizeof(Value));
+    c->nArgs = frame->originalArgumentsCount;
+    for (uint i = frame->originalArgumentsCount; i < function->nFormals; ++i)
+        args[i] = Encode::undefined();
 
     return c;
 }
 
-Heap::WithContext *ExecutionContext::newWithContext(Heap::Object *with)
+Heap::ExecutionContext *ExecutionContext::newWithContext(Heap::Object *with)
 {
-    return engine()->memoryManager->alloc<WithContext>(d(), with);
+    Heap::ExecutionContext *c = engine()->memoryManager->alloc<ExecutionContext>(Heap::ExecutionContext::Type_WithContext);
+    c->outer.set(engine(), d());
+    c->activation.set(engine(), with);
+
+    return c;
 }
 
 Heap::CatchContext *ExecutionContext::newCatchContext(Heap::String *exceptionVarName, ReturnedValue exceptionValue)
@@ -120,25 +113,23 @@ void ExecutionContext::createMutableBinding(String *name, bool deletable)
     while (ctx) {
         switch (ctx->d()->type) {
         case Heap::ExecutionContext::Type_CallContext:
-        case Heap::ExecutionContext::Type_SimpleCallContext: {
-            Heap::SimpleCallContext *c = static_cast<Heap::SimpleCallContext *>(ctx->d());
             if (!activation) {
+                Heap::CallContext *c = static_cast<Heap::CallContext *>(ctx->d());
                 if (!c->activation)
                     c->activation.set(scope.engine, scope.engine->newObject());
                 activation = c->activation;
             }
             break;
-        }
         case Heap::ExecutionContext::Type_QmlContext: {
             // this is ugly, as it overrides the inner callcontext, but has to stay as long
             // as bindings still get their own callcontext
-            Heap::QmlContext *qml = static_cast<Heap::QmlContext *>(ctx->d());
-            activation = qml->qml;
+            activation = ctx->d()->activation;
             break;
         }
         case Heap::ExecutionContext::Type_GlobalContext: {
+            Q_ASSERT(scope.engine->globalObject->d() == ctx->d()->activation);
             if (!activation)
-                activation = scope.engine->globalObject;
+                activation = ctx->d()->activation;
             break;
         }
         default:
@@ -155,99 +146,46 @@ void ExecutionContext::createMutableBinding(String *name, bool deletable)
     activation->__defineOwnProperty__(scope.engine, name, desc, attrs);
 }
 
-void Heap::GlobalContext::init(ExecutionEngine *eng)
-{
-    Heap::ExecutionContext::init(Heap::ExecutionContext::Type_GlobalContext);
-    global.set(eng, eng->globalObject->d());
-}
-
 void Heap::CatchContext::init(ExecutionContext *outerContext, String *exceptionVarName,
                               const Value &exceptionValue)
 {
     Heap::ExecutionContext::init(Heap::ExecutionContext::Type_CatchContext);
     outer.set(internalClass->engine, outerContext);
-    strictMode = outer->strictMode;
-    callData = outer->callData;
-    lookups = outer->lookups;
-    constantTable = outer->constantTable;
-    compilationUnit = outer->compilationUnit;
 
     this->exceptionVarName.set(internalClass->engine, exceptionVarName);
     this->exceptionValue.set(internalClass->engine, exceptionValue);
 }
 
-void Heap::WithContext::init(ExecutionContext *outerContext, Object *with)
-{
-    Heap::ExecutionContext::init(Heap::ExecutionContext::Type_WithContext);
-    outer.set(internalClass->engine, outerContext);
-    callData = outer->callData;
-    lookups = outer->lookups;
-    constantTable = outer->constantTable;
-    compilationUnit = outer->compilationUnit;
-
-    withObject.set(internalClass->engine, with);
-}
-
-Identifier * const *SimpleCallContext::formals() const
-{
-    return d()->v4Function ? d()->v4Function->internalClass->nameMap.constData() : 0;
-}
-
-unsigned int SimpleCallContext::formalCount() const
-{
-    return d()->v4Function ? d()->v4Function->nFormals : 0;
-}
-
-Identifier * const *SimpleCallContext::variables() const
-{
-    return d()->v4Function ? d()->v4Function->internalClass->nameMap.constData() + d()->v4Function->nFormals : 0;
-}
-
-unsigned int SimpleCallContext::variableCount() const
-{
-    return d()->v4Function ? d()->v4Function->compiledFunction->nLocals : 0;
-}
-
-
-
 bool ExecutionContext::deleteProperty(String *name)
 {
     name->makeIdentifier();
     Identifier *id = name->identifier();
 
-    Scope scope(this);
-    ScopedContext ctx(scope, this);
-    for (; ctx; ctx = ctx->d()->outer) {
-        switch (ctx->d()->type) {
+    Heap::ExecutionContext *ctx = d();
+    for (; ctx; ctx = ctx->outer) {
+        switch (ctx->type) {
         case Heap::ExecutionContext::Type_CatchContext: {
-            Heap::CatchContext *c = static_cast<Heap::CatchContext *>(ctx->d());
+            Heap::CatchContext *c = static_cast<Heap::CatchContext *>(ctx);
             if (c->exceptionVarName->isEqualTo(name->d()))
                 return false;
             break;
         }
-        case Heap::ExecutionContext::Type_WithContext: {
-            ScopedObject withObject(scope, static_cast<Heap::WithContext *>(ctx->d())->withObject);
-            if (withObject->hasProperty(name))
-                return withObject->deleteProperty(name);
-            break;
-        }
-        case Heap::ExecutionContext::Type_GlobalContext: {
-            ScopedObject global(scope, static_cast<Heap::GlobalContext *>(ctx->d())->global);
-            if (global->hasProperty(name))
-                return global->deleteProperty(name);
-            break;
-        }
-        case Heap::ExecutionContext::Type_CallContext:
-            Q_FALLTHROUGH();
-        case Heap::ExecutionContext::Type_SimpleCallContext: {
-            Heap::SimpleCallContext *c = static_cast<Heap::SimpleCallContext *>(ctx->d());
-            uint index = c->v4Function->internalClass->find(id);
+        case Heap::ExecutionContext::Type_CallContext: {
+            Heap::CallContext *c = static_cast<Heap::CallContext *>(ctx);
+            uint index = c->internalClass->find(id);
             if (index < UINT_MAX)
                 // ### throw in strict mode?
                 return false;
-            ScopedObject qml(scope, c->activation);
-            if (qml && qml->hasProperty(name))
-                return qml->deleteProperty(name);
+            Q_FALLTHROUGH();
+        }
+        case Heap::ExecutionContext::Type_WithContext:
+        case Heap::ExecutionContext::Type_GlobalContext: {
+            if (ctx->activation) {
+                Scope scope(this);
+                ScopedObject object(scope, ctx->activation);
+                if (object && object->hasProperty(name))
+                    return object->deleteProperty(name);
+            }
             break;
         }
         case Heap::ExecutionContext::Type_QmlContext:
@@ -256,305 +194,165 @@ bool ExecutionContext::deleteProperty(String *name)
         }
     }
 
-    if (d()->strictMode)
-        engine()->throwSyntaxError(QStringLiteral("Can't delete property %1").arg(name->toQString()));
-    return true;
-}
-
-// Do a standard call with this execution context as the outer scope
-void ExecutionContext::call(Scope &scope, CallData *callData, Function *function, const FunctionObject *f)
-{
-    ExecutionContextSaver ctxSaver(scope);
-
-    Scoped<CallContext> ctx(scope, newCallContext(function, callData));
-    if (f)
-        ctx->d()->function.set(scope.engine, f->d());
-    scope.engine->pushContext(ctx);
-
-    scope.result = Q_V4_PROFILE(scope.engine, function);
-
-    if (function->hasQmlDependencies)
-        QQmlPropertyCapture::registerQmlDependencies(function->compiledFunction, scope);
+    return !engine()->currentStackFrame->v4Function->isStrict();
 }
 
-// Do a simple, fast call with this execution context as the outer scope
-void QV4::ExecutionContext::simpleCall(Scope &scope, CallData *callData, Function *function)
-{
-    Q_ASSERT(function->canUseSimpleFunction());
-
-    ExecutionContextSaver ctxSaver(scope);
-
-    SimpleCallContext::Data *ctx = scope.engine->memoryManager->allocSimpleCallContext();
-
-    ctx->strictMode = function->isStrict();
-    ctx->callData = callData;
-    ctx->v4Function = function;
-    ctx->compilationUnit = function->compilationUnit;
-    ctx->lookups = function->compilationUnit->runtimeLookups;
-    ctx->constantTable = function->compilationUnit->constants;
-    ctx->outer.set(scope.engine, this->d());
-    for (int i = callData->argc; i < (int)function->nFormals; ++i)
-        callData->args[i] = Encode::undefined();
-
-    scope.engine->pushContext(ctx);
-    Q_ASSERT(scope.engine->current == ctx);
-
-    scope.result = Q_V4_PROFILE(scope.engine, function);
-
-    if (function->hasQmlDependencies)
-        QQmlPropertyCapture::registerQmlDependencies(function->compiledFunction, scope);
-    scope.engine->memoryManager->freeSimpleCallContext();
-}
-
-void ExecutionContext::setProperty(String *name, const Value &value)
+ExecutionContext::Error ExecutionContext::setProperty(String *name, const Value &value)
 {
     name->makeIdentifier();
     Identifier *id = name->identifier();
 
-    Scope scope(this);
-    ScopedContext ctx(scope, this);
-    ScopedObject activation(scope);
+    QV4::ExecutionEngine *v4 = engine();
+    Heap::ExecutionContext *ctx = d();
 
-    for (; ctx; ctx = ctx->d()->outer) {
-        activation = (Object *)0;
-        switch (ctx->d()->type) {
+    for (; ctx; ctx = ctx->outer) {
+        switch (ctx->type) {
         case Heap::ExecutionContext::Type_CatchContext: {
-            Heap::CatchContext *c = static_cast<Heap::CatchContext *>(ctx->d());
+            Heap::CatchContext *c = static_cast<Heap::CatchContext *>(ctx);
             if (c->exceptionVarName->isEqualTo(name->d())) {
-                    c->exceptionValue.set(scope.engine, value);
-                    return;
+                    c->exceptionValue.set(v4, value);
+                    return NoError;
             }
             break;
         }
         case Heap::ExecutionContext::Type_WithContext: {
-            ScopedObject w(scope, static_cast<Heap::WithContext *>(ctx->d())->withObject);
+            Scope scope(v4);
+            ScopedObject w(scope, ctx->activation);
             if (w->hasProperty(name)) {
-                w->put(name, value);
-                return;
+                if (!w->put(name, value))
+                    return TypeError;
+                return NoError;
             }
             break;
         }
-        case Heap::ExecutionContext::Type_GlobalContext: {
-            activation = static_cast<Heap::GlobalContext *>(ctx->d())->global;
-            break;
+        case Heap::ExecutionContext::Type_CallContext: {
+            Heap::CallContext *c = static_cast<Heap::CallContext *>(ctx);
+            uint index = c->internalClass->find(id);
+            if (index < UINT_MAX) {
+                static_cast<Heap::CallContext *>(c)->locals.set(v4, index, value);
+                return NoError;
+            }
         }
-        case Heap::ExecutionContext::Type_CallContext:
-        case Heap::ExecutionContext::Type_SimpleCallContext: {
-            Heap::SimpleCallContext *c = static_cast<Heap::SimpleCallContext *>(ctx->d());
-            if (c->v4Function) {
-                uint index = c->v4Function->internalClass->find(id);
-                if (index < UINT_MAX) {
-                    if (index < c->v4Function->nFormals) {
-                        c->callData->args[c->v4Function->nFormals - index - 1] = value;
-                    } else {
-                        Q_ASSERT(c->type == Heap::ExecutionContext::Type_CallContext);
-                        index -= c->v4Function->nFormals;
-                        static_cast<Heap::CallContext *>(c)->locals.set(scope.engine, index, value);
-                    }
-                    return;
+            Q_FALLTHROUGH();
+        case Heap::ExecutionContext::Type_GlobalContext:
+            if (ctx->activation) {
+                uint member = ctx->activation->internalClass->find(id);
+                if (member < UINT_MAX) {
+                    Scope scope(v4);
+                    ScopedObject a(scope, ctx->activation);
+                    if (!a->putValue(member, value))
+                        return TypeError;
+                    return NoError;
                 }
             }
-            activation = c->activation;
             break;
-        }
         case Heap::ExecutionContext::Type_QmlContext: {
-            activation = static_cast<Heap::QmlContext *>(ctx->d())->qml;
-            activation->put(name, value);
-            return;
+            Scope scope(v4);
+            ScopedObject activation(scope, ctx->activation);
+            if (!activation->put(name, value))
+                return TypeError;
+            return NoError;
         }
         }
 
-        if (activation) {
-            uint member = activation->internalClass()->find(id);
-            if (member < UINT_MAX) {
-                activation->putValue(member, value);
-                return;
-            }
-        }
     }
 
-    if (d()->strictMode || name->equals(engine()->id_this())) {
-        ScopedValue n(scope, name->asReturnedValue());
-        engine()->throwReferenceError(n);
-        return;
-    }
-    engine()->globalObject->put(name, value);
+    return RangeError;
 }
 
 ReturnedValue ExecutionContext::getProperty(String *name)
 {
-    Scope scope(this);
-    ScopedValue v(scope);
     name->makeIdentifier();
 
-    if (name->equals(engine()->id_this()))
-        return thisObject().asReturnedValue();
-
-    ScopedContext ctx(scope, this);
-    for (; ctx; ctx = ctx->d()->outer) {
-        switch (ctx->d()->type) {
+    Heap::ExecutionContext *ctx = d();
+    for (; ctx; ctx = ctx->outer) {
+        switch (ctx->type) {
         case Heap::ExecutionContext::Type_CatchContext: {
-            Heap::CatchContext *c = static_cast<Heap::CatchContext *>(ctx->d());
+            Heap::CatchContext *c = static_cast<Heap::CatchContext *>(ctx);
             if (c->exceptionVarName->isEqualTo(name->d()))
                 return c->exceptionValue.asReturnedValue();
             break;
         }
-        case Heap::ExecutionContext::Type_WithContext: {
-            ScopedObject w(scope, static_cast<Heap::WithContext *>(ctx->d())->withObject);
-            bool hasProperty = false;
-            v = w->get(name, &hasProperty);
-            if (hasProperty) {
-                return v->asReturnedValue();
-            }
-            break;
-        }
-        case Heap::ExecutionContext::Type_GlobalContext: {
-            ScopedObject global(scope, static_cast<Heap::GlobalContext *>(ctx->d())->global);
-            bool hasProperty = false;
-            v = global->get(name, &hasProperty);
-            if (hasProperty)
-                return v->asReturnedValue();
-            break;
-        }
-        case Heap::ExecutionContext::Type_CallContext:
-            Q_FALLTHROUGH();
-        case Heap::ExecutionContext::Type_SimpleCallContext: {
-            Heap::SimpleCallContext *c = static_cast<Heap::SimpleCallContext *>(ctx->d());
-
-            name->makeIdentifier();
+        case Heap::ExecutionContext::Type_CallContext: {
+            Heap::CallContext *c = static_cast<Heap::CallContext *>(ctx);
             Identifier *id = name->identifier();
-            uint index = c->v4Function->internalClass->find(id);
-            if (index < UINT_MAX) {
-                if (index < c->v4Function->nFormals)
-                    return c->callData->args[c->v4Function->nFormals - index - 1].asReturnedValue();
-                if (c->type == Heap::ExecutionContext::Type_CallContext)
-                    return static_cast<Heap::CallContext *>(c)->locals[index - c->v4Function->nFormals].asReturnedValue();
-            }
 
-            ScopedObject activation(scope, c->activation);
-            if (activation) {
+            uint index = c->internalClass->find(id);
+            if (index < UINT_MAX)
+                return c->locals[index].asReturnedValue();
+            Q_FALLTHROUGH();
+        }
+        case Heap::ExecutionContext::Type_WithContext:
+        case Heap::ExecutionContext::Type_GlobalContext:
+        case Heap::ExecutionContext::Type_QmlContext: {
+            if (ctx->activation) {
+                Scope scope(this);
+                ScopedObject activation(scope, ctx->activation);
                 bool hasProperty = false;
-                v = activation->get(name, &hasProperty);
+                ReturnedValue v = activation->get(name, &hasProperty);
                 if (hasProperty)
-                    return v->asReturnedValue();
-            }
-
-            if (c->v4Function->isNamedExpression() && c->type == Heap::ExecutionContext::Type_CallContext) {
-                if (name->equals(ScopedString(scope, c->v4Function->name())))
-                    if (auto func = static_cast<Heap::CallContext *>(c)->function)
-                        return func->asReturnedValue();
+                    return v;
             }
             break;
         }
-        case Heap::ExecutionContext::Type_QmlContext: {
-            ScopedObject qml(scope, static_cast<Heap::QmlContext *>(ctx->d())->qml);
-            bool hasProperty = false;
-            v = qml->get(name, &hasProperty);
-            if (hasProperty)
-                return v->asReturnedValue();
-            break;
-        }
         }
     }
-    ScopedValue n(scope, name);
-    return engine()->throwReferenceError(n);
+    return engine()->throwReferenceError(*name);
 }
 
 ReturnedValue ExecutionContext::getPropertyAndBase(String *name, Value *base)
 {
-    Scope scope(this);
-    ScopedValue v(scope);
     base->setM(0);
     name->makeIdentifier();
 
-    if (name->equals(engine()->id_this()))
-        return thisObject().asReturnedValue();
-
-    ScopedContext ctx(scope, this);
-    for (; ctx; ctx = ctx->d()->outer) {
-        switch (ctx->d()->type) {
+    Heap::ExecutionContext *ctx = d();
+    for (; ctx; ctx = ctx->outer) {
+        switch (ctx->type) {
         case Heap::ExecutionContext::Type_CatchContext: {
-            Heap::CatchContext *c = static_cast<Heap::CatchContext *>(ctx->d());
+            Heap::CatchContext *c = static_cast<Heap::CatchContext *>(ctx);
             if (c->exceptionVarName->isEqualTo(name->d()))
                 return c->exceptionValue.asReturnedValue();
             break;
         }
-        case Heap::ExecutionContext::Type_WithContext: {
-            ScopedObject w(scope, static_cast<Heap::WithContext *>(ctx->d())->withObject);
-            bool hasProperty = false;
-            v = w->get(name, &hasProperty);
-            if (hasProperty) {
-                base->setM(w->d());
-                return v->asReturnedValue();
-            }
-            break;
-        }
-        case Heap::ExecutionContext::Type_GlobalContext: {
-            ScopedObject global(scope, static_cast<Heap::GlobalContext *>(ctx->d())->global);
-            bool hasProperty = false;
-            v = global->get(name, &hasProperty);
-            if (hasProperty)
-                return v->asReturnedValue();
-            break;
-        }
-        case Heap::ExecutionContext::Type_CallContext:
-            Q_FALLTHROUGH();
-        case Heap::ExecutionContext::Type_SimpleCallContext: {
-            Heap::SimpleCallContext *c = static_cast<Heap::SimpleCallContext *>(ctx->d());
-
+        case Heap::ExecutionContext::Type_CallContext: {
+            Heap::CallContext *c = static_cast<Heap::CallContext *>(ctx);
             name->makeIdentifier();
             Identifier *id = name->identifier();
-            uint index = c->v4Function->internalClass->find(id);
-            if (index < UINT_MAX) {
-                if (index < c->v4Function->nFormals)
-                    return c->callData->args[c->v4Function->nFormals - index - 1].asReturnedValue();
-                if (c->type == Heap::ExecutionContext::Type_CallContext)
-                    return static_cast<Heap::CallContext *>(c)->locals[index - c->v4Function->nFormals].asReturnedValue();
-            }
 
-            ScopedObject activation(scope, c->activation);
-            if (activation) {
+            uint index = c->internalClass->find(id);
+            if (index < UINT_MAX)
+                return c->locals[index].asReturnedValue();
+            Q_FALLTHROUGH();
+        }
+        case Heap::ExecutionContext::Type_GlobalContext: {
+            if (ctx->activation) {
+                Scope scope(this);
+                ScopedObject activation(scope, ctx->activation);
                 bool hasProperty = false;
-                v = activation->get(name, &hasProperty);
+                ReturnedValue v = activation->get(name, &hasProperty);
                 if (hasProperty)
-                    return v->asReturnedValue();
-            }
-
-            if (c->v4Function->isNamedExpression() && c->type == Heap::ExecutionContext::Type_CallContext) {
-                if (name->equals(ScopedString(scope, c->v4Function->name())))
-                    if (auto func = static_cast<Heap::CallContext *>(c)->function)
-                        return func->asReturnedValue();
+                    return v;
             }
             break;
         }
+        case Heap::ExecutionContext::Type_WithContext:
         case Heap::ExecutionContext::Type_QmlContext: {
-            ScopedObject qml(scope, static_cast<Heap::QmlContext *>(ctx->d())->qml);
+            Scope scope(this);
+            ScopedObject o(scope, ctx->activation);
             bool hasProperty = false;
-            v = qml->get(name, &hasProperty);
+            ReturnedValue v = o->get(name, &hasProperty);
             if (hasProperty) {
-                base->setM(qml->d());
-                return v->asReturnedValue();
+                base->setM(o->d());
+                return v;
             }
             break;
         }
         }
     }
-    ScopedValue n(scope, name);
-    return engine()->throwReferenceError(n);
+    return engine()->throwReferenceError(*name);
 }
 
-Function *ExecutionContext::getFunction() const
+void Heap::CallContext::setArg(uint index, Value v)
 {
-    Scope scope(engine());
-    ScopedContext it(scope, this->d());
-    for (; it; it = it->d()->outer) {
-        if (const SimpleCallContext *callCtx = it->asSimpleCallContext())
-            return callCtx->d()->v4Function;
-        else if (it->asCatchContext() || it->asWithContext())
-            continue; // look in the parent context for a FunctionObject
-        else
-            break;
-    }
-
-    return 0;
+    locals.set(internalClass->engine, locals.size + index, v);
 }
diff --git a/src/qml/jsruntime/qv4context_p.h b/src/qml/jsruntime/qv4context_p.h
index a854c324d0..4efd0bc899 100644
--- a/src/qml/jsruntime/qv4context_p.h
+++ b/src/qml/jsruntime/qv4context_p.h
@@ -68,59 +68,66 @@ struct Function;
 struct Function;
 struct Identifier;
 struct CallContext;
-struct SimpleCallContext;
 struct CatchContext;
-struct WithContext;
 struct QmlContext;
 struct QQmlContextWrapper;
 
-// Attention: Make sure that this structure is the same size on 32-bit and 64-bit
-// architecture or you'll have to change the JIT code.
 struct CallData
 {
-    // below is to be compatible with Value. Initialize tag to 0
-#if Q_BYTE_ORDER != Q_LITTLE_ENDIAN
-    uint tag;
-#endif
-    int argc;
-#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
-    uint tag;
-#endif
+    enum Offsets {
+        Function = 0,
+        Context = 1,
+        Accumulator = 2,
+        This = 3,
+        Argc = 4
+    };
+
+    Value function;
+    Value context;
+    Value accumulator;
+    Value thisObject;
+    Value _argc;
+
+    int argc() const {
+        Q_ASSERT(_argc.isInteger());
+        return _argc.int_32();
+    }
+
+    void setArgc(int argc) {
+        Q_ASSERT(argc >= 0);
+        _argc.setInt_32(argc);
+    }
+
     inline ReturnedValue argument(int i) const {
-        return i < argc ? args[i].asReturnedValue() : Primitive::undefinedValue().asReturnedValue();
+        return i < argc() ? args[i].asReturnedValue() : Primitive::undefinedValue().asReturnedValue();
     }
 
-    Value thisObject;
     Value args[1];
+
+    static Q_DECL_CONSTEXPR int HeaderSize() { return offsetof(CallData, args) / sizeof(QV4::Value); }
 };
 
 Q_STATIC_ASSERT(std::is_standard_layout<CallData>::value);
-Q_STATIC_ASSERT(offsetof(CallData, thisObject) == 8);
-Q_STATIC_ASSERT(offsetof(CallData, args) == 16);
+Q_STATIC_ASSERT(offsetof(CallData, thisObject) == CallData::This*sizeof(Value));
+Q_STATIC_ASSERT(offsetof(CallData, args) == 5*sizeof(Value));
 
 namespace Heap {
 
 struct QmlContext;
 
 #define ExecutionContextMembers(class, Member) \
-    Member(class, NoMark, CallData *, callData)  \
     Member(class, Pointer, ExecutionContext *, outer) \
-    Member(class, NoMark, Lookup *, lookups) \
-    Member(class, NoMark, const QV4::Value *, constantTable) \
-    Member(class, NoMark, CompiledData::CompilationUnitBase *, compilationUnit) \
-    Member(class, NoMark, int, lineNumber) // as member of non-pointer size this has to come last to preserve the ability to
-                                           // translate offsetof of it between 64-bit and 32-bit.
+    Member(class, Pointer, Object *, activation)
 
 DECLARE_HEAP_OBJECT(ExecutionContext, Base) {
-    DECLARE_MARK_TABLE(ExecutionContext);
+    DECLARE_MARKOBJECTS(ExecutionContext);
 
     enum ContextType {
         Type_GlobalContext = 0x1,
         Type_CatchContext = 0x2,
         Type_WithContext = 0x3,
         Type_QmlContext = 0x4,
-        Type_SimpleCallContext = 0x5,
-        Type_CallContext = 0x6
+        Type_CallContext = 0x5
     };
 
     void init(ContextType t)
@@ -128,105 +135,63 @@ DECLARE_HEAP_OBJECT(ExecutionContext, Base) {
         Base::init();
 
         type = t;
-        lineNumber = -1;
     }
 
-    quint8 type;
-    bool strictMode : 8;
+    quint32 type : 8;
+    quint32 nArgs : 24;
 #if QT_POINTER_SIZE == 8
-    quint8 padding_[6];
-#else
-    quint8 padding_[2];
+    quint8 padding_[4];
 #endif
 };
 V4_ASSERT_IS_TRIVIAL(ExecutionContext)
 Q_STATIC_ASSERT(sizeof(ExecutionContext) == sizeof(Base) + sizeof(ExecutionContextData) + QT_POINTER_SIZE);
 
 Q_STATIC_ASSERT(std::is_standard_layout<ExecutionContextData>::value);
-Q_STATIC_ASSERT(offsetof(ExecutionContextData, callData) == 0);
-Q_STATIC_ASSERT(offsetof(ExecutionContextData, outer) == offsetof(ExecutionContextData, callData) + QT_POINTER_SIZE);
-Q_STATIC_ASSERT(offsetof(ExecutionContextData, lookups) == offsetof(ExecutionContextData, outer) + QT_POINTER_SIZE);
-Q_STATIC_ASSERT(offsetof(ExecutionContextData, constantTable) == offsetof(ExecutionContextData, lookups) + QT_POINTER_SIZE);
-Q_STATIC_ASSERT(offsetof(ExecutionContextData, compilationUnit) == offsetof(ExecutionContextData, constantTable) + QT_POINTER_SIZE);
-Q_STATIC_ASSERT(offsetof(ExecutionContextData, lineNumber) == offsetof(ExecutionContextData, compilationUnit) + QT_POINTER_SIZE);
-
-#define SimpleCallContextMembers(class, Member) \
-    Member(class, Pointer, Object *, activation) \
-    Member(class, NoMark, QV4::Function *, v4Function)
-
-DECLARE_HEAP_OBJECT(SimpleCallContext, ExecutionContext) {
-    DECLARE_MARK_TABLE(SimpleCallContext);
-
-    void init(ContextType t = Type_SimpleCallContext)
-    {
-        ExecutionContext::init(t);
-    }
-
-    inline unsigned int formalParameterCount() const;
+Q_STATIC_ASSERT(offsetof(ExecutionContextData, outer) == 0);
+Q_STATIC_ASSERT(offsetof(ExecutionContextData, activation) == offsetof(ExecutionContextData, outer) + QT_POINTER_SIZE);
 
-};
-V4_ASSERT_IS_TRIVIAL(SimpleCallContext)
-Q_STATIC_ASSERT(std::is_standard_layout<SimpleCallContextData>::value);
-Q_STATIC_ASSERT(offsetof(SimpleCallContextData, activation) == 0);
-Q_STATIC_ASSERT(offsetof(SimpleCallContextData, v4Function) == offsetof(SimpleCallContextData, activation) + QT_POINTER_SIZE);
-Q_STATIC_ASSERT(sizeof(SimpleCallContextData) == 2 * QT_POINTER_SIZE);
-Q_STATIC_ASSERT(sizeof(SimpleCallContext) == sizeof(ExecutionContext) + sizeof(SimpleCallContextData));
-
-#if QT_POINTER_SIZE == 8
 #define CallContextMembers(class, Member) \
     Member(class, Pointer, FunctionObject *, function) \
     Member(class, ValueArray, ValueArray, locals)
-#else
-#define CallContextMembers(class, Member) \
-    Member(class, Pointer, FunctionObject *, function) \
-    Member(class, NoMark, void *, padding) \
-    Member(class, ValueArray, ValueArray, locals)
-#endif
 
-DECLARE_HEAP_OBJECT(CallContext, SimpleCallContext) {
-    DECLARE_MARK_TABLE(CallContext);
+DECLARE_HEAP_OBJECT(CallContext, ExecutionContext) {
+    DECLARE_MARKOBJECTS(CallContext);
 
-    using SimpleCallContext::formalParameterCount;
-};
+    void init()
+    {
+        ExecutionContext::init(Type_CallContext);
+    }
 
+    int argc() const {
+        return static_cast<int>(nArgs);
+    }
+    const Value *args() const {
+        return locals.data() + locals.size;
+    }
+    void setArg(uint index, Value v);
+};
+V4_ASSERT_IS_TRIVIAL(CallContext)
 Q_STATIC_ASSERT(std::is_standard_layout<CallContextData>::value);
 Q_STATIC_ASSERT(offsetof(CallContextData, function) == 0);
-// IMPORTANT: we cannot do offsetof(CallContextData, locals) in the JIT as the offset does not scale with
-// the pointer size. On 32-bit ARM the offset of the ValueArray is aligned to 8 bytes, on 32-bit x86 for
-// example it is not. Therefore we have a padding in place and always have a distance of 8 bytes.
-Q_STATIC_ASSERT(offsetof(CallContextData, locals) == offsetof(CallContextData, function) + 8);
-
-#define GlobalContextMembers(class, Member) \
-    Member(class, Pointer, Object *, global)
-
-DECLARE_HEAP_OBJECT(GlobalContext, ExecutionContext) {
-    DECLARE_MARK_TABLE(GlobalContext);
-
-    void init(ExecutionEngine *engine);
-};
-V4_ASSERT_IS_TRIVIAL(GlobalContext)
+//### The following size check fails on Win8. With the ValueArray at the end of the
+// CallContextMembers, it doesn't look very useful.
+//#if defined(Q_PROCESSOR_ARM_32) && !defined(Q_OS_IOS)
+//Q_STATIC_ASSERT(sizeof(CallContext) == sizeof(ExecutionContext) + sizeof(CallContextData) + QT_POINTER_SIZE);
+//#else
+//Q_STATIC_ASSERT(sizeof(CallContext) == sizeof(ExecutionContext) + sizeof(CallContextData));
+//#endif
 
 #define CatchContextMembers(class, Member) \
     Member(class, Pointer, String *, exceptionVarName) \
     Member(class, HeapValue, HeapValue, exceptionValue)
 
 DECLARE_HEAP_OBJECT(CatchContext, ExecutionContext) {
-    DECLARE_MARK_TABLE(CatchContext);
+    DECLARE_MARKOBJECTS(CatchContext);
 
     void init(ExecutionContext *outerContext, String *exceptionVarName, const Value &exceptionValue);
 };
 V4_ASSERT_IS_TRIVIAL(CatchContext)
 
-#define WithContextMembers(class, Member) \
-    Member(class, Pointer, Object *, withObject)
-
-DECLARE_HEAP_OBJECT(WithContext, ExecutionContext) {
-    DECLARE_MARK_TABLE(WithContext);
-
-    void init(ExecutionContext *outerContext, Object *with);
-};
-V4_ASSERT_IS_TRIVIAL(WithContext)
-
 }
 
 struct Q_QML_EXPORT ExecutionContext : public Managed
@@ -239,68 +204,39 @@ struct Q_QML_EXPORT ExecutionContext : public Managed
     Q_MANAGED_TYPE(ExecutionContext)
     V4_INTERNALCLASS(ExecutionContext)
 
-    Heap::CallContext *newCallContext(Function *f, CallData *callData);
-    Heap::WithContext *newWithContext(Heap::Object *with);
+    static Heap::CallContext *newCallContext(QV4::CppStackFrame *frame);
+    Heap::ExecutionContext *newWithContext(Heap::Object *with);
     Heap::CatchContext *newCatchContext(Heap::String *exceptionVarName, ReturnedValue exceptionValue);
 
     void createMutableBinding(String *name, bool deletable);
 
-    void setProperty(String *name, const Value &value);
+    enum Error {
+        NoError,
+        TypeError,
+        RangeError
+    };
+
+    Error setProperty(String *name, const Value &value);
+
     ReturnedValue getProperty(String *name);
     ReturnedValue getPropertyAndBase(String *name, Value *base);
     bool deleteProperty(String *name);
 
-    inline SimpleCallContext *asSimpleCallContext();
-    inline const SimpleCallContext *asSimpleCallContext() const;
-    inline const CatchContext *asCatchContext() const;
-    inline const WithContext *asWithContext() const;
+    inline CallContext *asCallContext();
+    inline const CallContext *asCallContext() const;
+};
 
-    Function *getFunction() const;
+struct Q_QML_EXPORT CallContext : public ExecutionContext
+{
+    V4_MANAGED(CallContext, ExecutionContext)
+    V4_INTERNALCLASS(CallContext)
 
-    Value &thisObject() const {
-        return d()->callData->thisObject;
-    }
     int argc() const {
-        return d()->callData->argc;
+        return d()->argc();
     }
     const Value *args() const {
-        return d()->callData->args;
-    }
-    ReturnedValue argument(int i) const {
-        return d()->callData->argument(i);
+        return d()->args();
     }
-
-    void call(Scope &scope, CallData *callData, QV4::Function *function, const QV4::FunctionObject *f = 0);
-    void simpleCall(Scope &scope, CallData *callData, QV4::Function *function);
-};
-
-struct Q_QML_EXPORT SimpleCallContext : public ExecutionContext
-{
-    V4_MANAGED(SimpleCallContext, ExecutionContext)
-    V4_INTERNALCLASS(SimpleCallContext)
-
-    // formals are in reverse order
-    Identifier * const *formals() const;
-    unsigned int formalCount() const;
-    Identifier * const *variables() const;
-    unsigned int variableCount() const;
-
-    inline ReturnedValue argument(int i) const;
-};
-
-inline ReturnedValue SimpleCallContext::argument(int i) const {
-    return i < argc() ? args()[i].asReturnedValue() : Primitive::undefinedValue().asReturnedValue();
-}
-
-struct Q_QML_EXPORT CallContext : public SimpleCallContext
-{
-    V4_MANAGED(CallContext, SimpleCallContext)
-};
-
-struct GlobalContext : public ExecutionContext
-{
-    V4_MANAGED(GlobalContext, ExecutionContext)
-
 };
 
 struct CatchContext : public ExecutionContext
@@ -308,29 +244,14 @@ struct CatchContext : public ExecutionContext
     V4_MANAGED(CatchContext, ExecutionContext)
 };
 
-struct WithContext : public ExecutionContext
-{
-    V4_MANAGED(WithContext, ExecutionContext)
-};
-
-inline SimpleCallContext *ExecutionContext::asSimpleCallContext()
-{
-    return d()->type >= Heap::ExecutionContext::Type_SimpleCallContext ? static_cast<SimpleCallContext *>(this) : 0;
-}
-
-inline const SimpleCallContext *ExecutionContext::asSimpleCallContext() const
-{
-    return d()->type >= Heap::ExecutionContext::Type_SimpleCallContext ? static_cast<const SimpleCallContext *>(this) : 0;
-}
-
-inline const CatchContext *ExecutionContext::asCatchContext() const
+inline CallContext *ExecutionContext::asCallContext()
 {
-    return d()->type == Heap::ExecutionContext::Type_CatchContext ? static_cast<const CatchContext *>(this) : 0;
+    return d()->type == Heap::ExecutionContext::Type_CallContext ? static_cast<CallContext *>(this) : 0;
 }
 
-inline const WithContext *ExecutionContext::asWithContext() const
+inline const CallContext *ExecutionContext::asCallContext() const
 {
-    return d()->type == Heap::ExecutionContext::Type_WithContext ? static_cast<const WithContext *>(this) : 0;
+    return d()->type == Heap::ExecutionContext::Type_CallContext ? static_cast<const CallContext *>(this) : 0;
 }
 
 } // namespace QV4
diff --git a/src/qml/jsruntime/qv4dataview.cpp b/src/qml/jsruntime/qv4dataview.cpp
index f1405e08ee..397ef1cfec 100644
--- a/src/qml/jsruntime/qv4dataview.cpp
+++ b/src/qml/jsruntime/qv4dataview.cpp
@@ -54,34 +54,31 @@ void Heap::DataViewCtor::init(QV4::ExecutionContext *scope)
     Heap::FunctionObject::init(scope, QStringLiteral("DataView"));
 }
 
-void DataViewCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue DataViewCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    Scoped<ArrayBuffer> buffer(scope, callData->argument(0));
-    if (!buffer) {
-        scope.result = scope.engine->throwTypeError();
-        return;
-    }
+    Scope scope(f->engine());
+    Scoped<ArrayBuffer> buffer(scope, argc ? argv[0] : Primitive::undefinedValue());
+    if (!buffer)
+        return scope.engine->throwTypeError();
 
-    double bo = callData->argc > 1 ? callData->args[1].toNumber() : 0;
+    double bo = argc > 1 ? argv[1].toNumber() : 0;
     uint byteOffset = (uint)bo;
     uint bufferLength = buffer->d()->data->size;
-    double bl = callData->argc < 3 || callData->args[2].isUndefined() ? (bufferLength - bo) : callData->args[2].toNumber();
+    double bl = argc < 3 || argv[2].isUndefined() ? (bufferLength - bo) : argv[2].toNumber();
     uint byteLength = (uint)bl;
-    if (bo != byteOffset || bl != byteLength || byteOffset + byteLength > bufferLength) {
-        scope.result = scope.engine->throwRangeError(QStringLiteral("DataView: constructor arguments out of range"));
-        return;
-    }
+    if (bo != byteOffset || bl != byteLength || byteOffset + byteLength > bufferLength)
+        return scope.engine->throwRangeError(QStringLiteral("DataView: constructor arguments out of range"));
 
     Scoped<DataView> a(scope, scope.engine->memoryManager->allocObject<DataView>());
     a->d()->buffer.set(scope.engine, buffer->d());
     a->d()->byteLength = byteLength;
     a->d()->byteOffset = byteOffset;
-    scope.result = a.asReturnedValue();
+    return a.asReturnedValue();
 }
 
-void DataViewCtor::call(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue DataViewCtor::call(const FunctionObject *f, const Value *, const Value *argv, int argc)
 {
-    construct(that, scope, callData);
+    return callAsConstructor(f, argv, argc);
 }
 
 void DataViewPrototype::init(ExecutionEngine *engine, Object *ctor)
@@ -122,84 +119,84 @@ void DataViewPrototype::init(ExecutionEngine *engine, Object *ctor)
     defineDefaultProperty(QStringLiteral("setUInt32"), method_set<unsigned int>, 0);
 }
 
-void DataViewPrototype::method_get_buffer(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DataViewPrototype::method_get_buffer(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Scoped<DataView> v(scope, callData->thisObject);
+    const DataView *v = thisObject->as<DataView>();
     if (!v)
-        THROW_TYPE_ERROR();
+        return b->engine()->throwTypeError();
 
-    scope.result = v->d()->buffer;
+    return v->d()->buffer->asReturnedValue();
 }
 
-void DataViewPrototype::method_get_byteLength(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DataViewPrototype::method_get_byteLength(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Scoped<DataView> v(scope, callData->thisObject);
+    const DataView *v = thisObject->as<DataView>();
     if (!v)
-        THROW_TYPE_ERROR();
+        return b->engine()->throwTypeError();
 
-    scope.result = Encode(v->d()->byteLength);
+    return Encode(v->d()->byteLength);
 }
 
-void DataViewPrototype::method_get_byteOffset(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DataViewPrototype::method_get_byteOffset(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Scoped<DataView> v(scope, callData->thisObject);
+    const DataView *v = thisObject->as<DataView>();
     if (!v)
-        THROW_TYPE_ERROR();
+        return b->engine()->throwTypeError();
 
-    scope.result = Encode(v->d()->byteOffset);
+    return Encode(v->d()->byteOffset);
 }
 
 template <typename T>
-void DataViewPrototype::method_getChar(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DataViewPrototype::method_getChar(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<DataView> v(scope, callData->thisObject);
-    if (!v || callData->argc < 1)
-        THROW_TYPE_ERROR();
-    double l = callData->args[0].toNumber();
+    const DataView *v = thisObject->as<DataView>();
+    if (!v || argc < 1)
+        return b->engine()->throwTypeError();
+    double l = argv[0].toNumber();
     uint idx = (uint)l;
     if (l != idx || idx + sizeof(T) > v->d()->byteLength)
-        THROW_TYPE_ERROR();
+        return b->engine()->throwTypeError();
     idx += v->d()->byteOffset;
 
     T t = T(v->d()->buffer->data->data()[idx]);
 
-    scope.result = Encode((int)t);
+    return Encode((int)t);
 }
 
 template <typename T>
-void DataViewPrototype::method_get(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DataViewPrototype::method_get(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<DataView> v(scope, callData->thisObject);
-    if (!v || callData->argc < 1)
-        THROW_TYPE_ERROR();
-    double l = callData->args[0].toNumber();
+    const DataView *v = thisObject->as<DataView>();
+    if (!v || argc < 1)
+        return b->engine()->throwTypeError();
+    double l = argv[0].toNumber();
     uint idx = (uint)l;
     if (l != idx || idx + sizeof(T) > v->d()->byteLength)
-        THROW_TYPE_ERROR();
+        return b->engine()->throwTypeError();
     idx += v->d()->byteOffset;
 
-    bool littleEndian = callData->argc < 2 ? false : callData->args[1].toBoolean();
+    bool littleEndian = argc < 2 ? false : argv[1].toBoolean();
 
     T t = littleEndian
             ? qFromLittleEndian<T>((uchar *)v->d()->buffer->data->data() + idx)
             : qFromBigEndian<T>((uchar *)v->d()->buffer->data->data() + idx);
 
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
 template <typename T>
-void DataViewPrototype::method_getFloat(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DataViewPrototype::method_getFloat(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<DataView> v(scope, callData->thisObject);
-    if (!v || callData->argc < 1)
-        THROW_TYPE_ERROR();
-    double l = callData->args[0].toNumber();
+    const DataView *v = thisObject->as<DataView>();
+    if (!v || argc < 1)
+        return b->engine()->throwTypeError();
+    double l = argv[0].toNumber();
     uint idx = (uint)l;
     if (l != idx || idx + sizeof(T) > v->d()->byteLength)
-        THROW_TYPE_ERROR();
+        return b->engine()->throwTypeError();
     idx += v->d()->byteOffset;
 
-    bool littleEndian = callData->argc < 2 ? false : callData->args[1].toBoolean();
+    bool littleEndian = argc < 2 ? false : argv[1].toBoolean();
 
     if (sizeof(T) == 4) {
         // float
@@ -210,7 +207,7 @@ void DataViewPrototype::method_getFloat(const BuiltinFunction *, Scope &scope, C
         u.i = littleEndian
                 ? qFromLittleEndian<uint>((uchar *)v->d()->buffer->data->data() + idx)
                 : qFromBigEndian<uint>((uchar *)v->d()->buffer->data->data() + idx);
-        scope.result = Encode(u.f);
+        return Encode(u.f);
     } else {
         Q_ASSERT(sizeof(T) == 8);
         union {
@@ -220,43 +217,43 @@ void DataViewPrototype::method_getFloat(const BuiltinFunction *, Scope &scope, C
         u.i = littleEndian
                 ? qFromLittleEndian<quint64>((uchar *)v->d()->buffer->data->data() + idx)
                 : qFromBigEndian<quint64>((uchar *)v->d()->buffer->data->data() + idx);
-        scope.result = Encode(u.d);
+        return Encode(u.d);
     }
 }
 
 template <typename T>
-void DataViewPrototype::method_setChar(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DataViewPrototype::method_setChar(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<DataView> v(scope, callData->thisObject);
-    if (!v || callData->argc < 1)
-        THROW_TYPE_ERROR();
-    double l = callData->args[0].toNumber();
+    const DataView *v = thisObject->as<DataView>();
+    if (!v || argc < 1)
+        return b->engine()->throwTypeError();
+    double l = argv[0].toNumber();
     uint idx = (uint)l;
     if (l != idx || idx + sizeof(T) > v->d()->byteLength)
-        THROW_TYPE_ERROR();
+        return b->engine()->throwTypeError();
     idx += v->d()->byteOffset;
 
-    int val = callData->argc >= 2 ? callData->args[1].toInt32() : 0;
+    int val = argc >= 2 ? argv[1].toInt32() : 0;
     v->d()->buffer->data->data()[idx] = (char)val;
 
     RETURN_UNDEFINED();
 }
 
 template <typename T>
-void DataViewPrototype::method_set(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DataViewPrototype::method_set(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<DataView> v(scope, callData->thisObject);
-    if (!v || callData->argc < 1)
-        THROW_TYPE_ERROR();
-    double l = callData->args[0].toNumber();
+    const DataView *v = thisObject->as<DataView>();
+    if (!v || argc < 1)
+        return b->engine()->throwTypeError();
+    double l = argv[0].toNumber();
     uint idx = (uint)l;
     if (l != idx || idx + sizeof(T) > v->d()->byteLength)
-        THROW_TYPE_ERROR();
+        return b->engine()->throwTypeError();
     idx += v->d()->byteOffset;
 
-    int val = callData->argc >= 2 ? callData->args[1].toInt32() : 0;
+    int val = argc >= 2 ? argv[1].toInt32() : 0;
 
-    bool littleEndian = callData->argc < 3 ? false : callData->args[2].toBoolean();
+    bool littleEndian = argc < 3 ? false : argv[2].toBoolean();
 
     if (littleEndian)
         qToLittleEndian<T>(val, (uchar *)v->d()->buffer->data->data() + idx);
@@ -267,19 +264,19 @@ void DataViewPrototype::method_set(const BuiltinFunction *, Scope &scope, CallDa
 }
 
 template <typename T>
-void DataViewPrototype::method_setFloat(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DataViewPrototype::method_setFloat(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<DataView> v(scope, callData->thisObject);
-    if (!v || callData->argc < 1)
-        THROW_TYPE_ERROR();
-    double l = callData->args[0].toNumber();
+    const DataView *v = thisObject->as<DataView>();
+    if (!v || argc < 1)
+        return b->engine()->throwTypeError();
+    double l = argv[0].toNumber();
     uint idx = (uint)l;
     if (l != idx || idx + sizeof(T) > v->d()->byteLength)
-        THROW_TYPE_ERROR();
+        return b->engine()->throwTypeError();
     idx += v->d()->byteOffset;
 
-    double val = callData->argc >= 2 ? callData->args[1].toNumber() : qt_qnan();
-    bool littleEndian = callData->argc < 3 ? false : callData->args[2].toBoolean();
+    double val = argc >= 2 ? argv[1].toNumber() : qt_qnan();
+    bool littleEndian = argc < 3 ? false : argv[2].toBoolean();
 
     if (sizeof(T) == 4) {
         // float
diff --git a/src/qml/jsruntime/qv4dataview_p.h b/src/qml/jsruntime/qv4dataview_p.h
index 5c50df4655..1e07d85118 100644
--- a/src/qml/jsruntime/qv4dataview_p.h
+++ b/src/qml/jsruntime/qv4dataview_p.h
@@ -69,7 +69,7 @@ struct DataViewCtor : FunctionObject {
     Member(class, NoMark, uint, byteOffset)
 
 DECLARE_HEAP_OBJECT(DataView, Object) {
-    DECLARE_MARK_TABLE(DataView);
+    DECLARE_MARKOBJECTS(DataView);
     void init() { Object::init(); }
 };
 
@@ -79,8 +79,8 @@ struct DataViewCtor: FunctionObject
 {
     V4_OBJECT2(DataViewCtor, FunctionObject)
 
-    static void construct(const Managed *m, Scope &scope, CallData *callData);
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct DataView : Object
@@ -93,21 +93,21 @@ struct DataViewPrototype: Object
 {
     void init(ExecutionEngine *engine, Object *ctor);
 
-    static void method_get_buffer(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_byteLength(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_byteOffset(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_get_buffer(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_get_byteLength(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_get_byteOffset(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
     template <typename T>
-    static void method_getChar(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_getChar(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
     template <typename T>
-    static void method_get(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_get(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
     template <typename T>
-    static void method_getFloat(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_getFloat(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
     template <typename T>
-    static void method_setChar(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_setChar(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
     template <typename T>
-    static void method_set(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_set(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
     template <typename T>
-    static void method_setFloat(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_setFloat(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 
diff --git a/src/qml/jsruntime/qv4dateobject.cpp b/src/qml/jsruntime/qv4dateobject.cpp
index 3aa20931ad..b8392d27e9 100644
--- a/src/qml/jsruntime/qv4dateobject.cpp
+++ b/src/qml/jsruntime/qv4dateobject.cpp
@@ -43,6 +43,7 @@
 #include "qv4scopedvalue_p.h"
 #include "qv4runtime_p.h"
 #include "qv4string_p.h"
+#include "qv4jscall_p.h"
 
 #include <QtCore/QDebug>
 #include <QtCore/QDateTime>
@@ -744,15 +745,16 @@ void Heap::DateCtor::init(QV4::ExecutionContext *scope)
     Heap::FunctionObject::init(scope, QStringLiteral("Date"));
 }
 
-void DateCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue DateCtor::callAsConstructor(const FunctionObject *that, const Value *argv, int argc)
 {
     double t = 0;
 
-    if (callData->argc == 0)
+    if (argc == 0)
         t = currentTime();
 
-    else if (callData->argc == 1) {
-        ScopedValue arg(scope, callData->args[0]);
+    else if (argc == 1) {
+        Scope scope(that->engine());
+        ScopedValue arg(scope, argv[0]);
         if (DateObject *d = arg->as<DateObject>()) {
             t = d->date();
         } else {
@@ -766,26 +768,26 @@ void DateCtor::construct(const Managed *, Scope &scope, CallData *callData)
     }
 
     else { // d.argc > 1
-        double year  = callData->args[0].toNumber();
-        double month = callData->args[1].toNumber();
-        double day  = callData->argc >= 3 ? callData->args[2].toNumber() : 1;
-        double hours = callData->argc >= 4 ? callData->args[3].toNumber() : 0;
-        double mins = callData->argc >= 5 ? callData->args[4].toNumber() : 0;
-        double secs = callData->argc >= 6 ? callData->args[5].toNumber() : 0;
-        double ms    = callData->argc >= 7 ? callData->args[6].toNumber() : 0;
+        double year  = argv[0].toNumber();
+        double month = argv[1].toNumber();
+        double day  = argc >= 3 ? argv[2].toNumber() : 1;
+        double hours = argc >= 4 ? argv[3].toNumber() : 0;
+        double mins = argc >= 5 ? argv[4].toNumber() : 0;
+        double secs = argc >= 6 ? argv[5].toNumber() : 0;
+        double ms    = argc >= 7 ? argv[6].toNumber() : 0;
         if (year >= 0 && year <= 99)
             year += 1900;
         t = MakeDate(MakeDay(year, month, day), MakeTime(hours, mins, secs, ms));
         t = TimeClip(UTC(t));
     }
 
-    scope.result = Encode(scope.engine->newDateObject(Primitive::fromDouble(t)));
+    return Encode(that->engine()->newDateObject(Primitive::fromDouble(t)));
 }
 
-void DateCtor::call(const Managed *m, Scope &scope, CallData *)
+ReturnedValue DateCtor::call(const FunctionObject *m, const Value *, const Value *, int)
 {
     double t = currentTime();
-    scope.result = static_cast<const DateCtor *>(m)->engine()->newString(ToString(t));
+    return m->engine()->newString(ToString(t))->asReturnedValue();
 }
 
 void DatePrototype::init(ExecutionEngine *engine, Object *ctor)
@@ -862,459 +864,518 @@ void DatePrototype::init(ExecutionEngine *engine, Object *ctor)
     defineDefaultProperty(QStringLiteral("toJSON"), method_toJSON, 1);
 }
 
-double DatePrototype::getThisDate(Scope &scope, CallData *callData)
+double DatePrototype::getThisDate(ExecutionEngine *v4, const Value *thisObject)
 {
-    if (DateObject *thisObject = callData->thisObject.as<DateObject>())
-        return thisObject->date();
-    else {
-        scope.engine->throwTypeError();
-        return 0;
-    }
+    if (const DateObject *that = thisObject->as<DateObject>())
+        return that->date();
+    v4->throwTypeError();
+    return 0;
 }
 
-void DatePrototype::method_parse(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_parse(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    if (!callData->argc)
-        scope.result = Encode(qt_qnan());
+    if (!argc)
+        return Encode(qt_qnan());
     else
-        scope.result = Encode(ParseString(callData->args[0].toQString()));
+        return Encode(ParseString(argv[0].toQString()));
 }
 
-void DatePrototype::method_UTC(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_UTC(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    const int numArgs = callData->argc;
+    const int numArgs = argc;
     if (numArgs >= 2) {
-        double year  = callData->args[0].toNumber();
-        double month = callData->args[1].toNumber();
-        double day   = numArgs >= 3 ? callData->args[2].toNumber() : 1;
-        double hours = numArgs >= 4 ? callData->args[3].toNumber() : 0;
-        double mins  = numArgs >= 5 ? callData->args[4].toNumber() : 0;
-        double secs  = numArgs >= 6 ? callData->args[5].toNumber() : 0;
-        double ms    = numArgs >= 7 ? callData->args[6].toNumber() : 0;
+        double year  = argv[0].toNumber();
+        double month = argv[1].toNumber();
+        double day   = numArgs >= 3 ? argv[2].toNumber() : 1;
+        double hours = numArgs >= 4 ? argv[3].toNumber() : 0;
+        double mins  = numArgs >= 5 ? argv[4].toNumber() : 0;
+        double secs  = numArgs >= 6 ? argv[5].toNumber() : 0;
+        double ms    = numArgs >= 7 ? argv[6].toNumber() : 0;
         if (year >= 0 && year <= 99)
             year += 1900;
         double t = MakeDate(MakeDay(year, month, day),
                             MakeTime(hours, mins, secs, ms));
-        scope.result = Encode(TimeClip(t));
-        return;
+        return Encode(TimeClip(t));
     }
     RETURN_UNDEFINED();
 }
 
-void DatePrototype::method_now(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_now(const FunctionObject *, const Value *, const Value *, int)
 {
-    Q_UNUSED(callData);
-    double t = currentTime();
-    scope.result = Encode(t);
+    return Encode(currentTime());
 }
 
-void DatePrototype::method_toString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
-    scope.result = scope.engine->newString(ToString(t));
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
+    return Encode(v4->newString(ToString(t)));
 }
 
-void DatePrototype::method_toDateString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_toDateString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
-    scope.result = scope.engine->newString(ToDateString(t));
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
+    return Encode(v4->newString(ToDateString(t)));
 }
 
-void DatePrototype::method_toTimeString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_toTimeString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
-    scope.result = scope.engine->newString(ToTimeString(t));
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
+    return Encode(v4->newString(ToTimeString(t)));
 }
 
-void DatePrototype::method_toLocaleString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_toLocaleString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
-    scope.result = scope.engine->newString(ToLocaleString(t));
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
+    return Encode(v4->newString(ToLocaleString(t)));
 }
 
-void DatePrototype::method_toLocaleDateString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_toLocaleDateString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
-    scope.result = scope.engine->newString(ToLocaleDateString(t));
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
+    return Encode(v4->newString(ToLocaleDateString(t)));
 }
 
-void DatePrototype::method_toLocaleTimeString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_toLocaleTimeString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
-    scope.result = scope.engine->newString(ToLocaleTimeString(t));
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
+    return Encode(v4->newString(ToLocaleTimeString(t)));
 }
 
-void DatePrototype::method_valueOf(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_valueOf(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
-    scope.result = Encode(t);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
+    return Encode(t);
 }
 
-void DatePrototype::method_getTime(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getTime(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
-    scope.result = Encode(t);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
+    return Encode(t);
 }
 
-void DatePrototype::method_getYear(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getYear(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = YearFromTime(LocalTime(t)) - 1900;
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getFullYear(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getFullYear(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = YearFromTime(LocalTime(t));
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getUTCFullYear(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getUTCFullYear(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = YearFromTime(t);
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getMonth(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getMonth(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = MonthFromTime(LocalTime(t));
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getUTCMonth(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getUTCMonth(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = MonthFromTime(t);
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getDate(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getDate(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = DateFromTime(LocalTime(t));
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getUTCDate(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getUTCDate(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = DateFromTime(t);
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getDay(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getDay(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = WeekDay(LocalTime(t));
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getUTCDay(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getUTCDay(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = WeekDay(t);
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getHours(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getHours(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = HourFromTime(LocalTime(t));
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getUTCHours(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getUTCHours(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = HourFromTime(t);
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getMinutes(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getMinutes(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = MinFromTime(LocalTime(t));
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getUTCMinutes(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getUTCMinutes(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = MinFromTime(t);
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getSeconds(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getSeconds(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = SecFromTime(LocalTime(t));
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getUTCSeconds(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getUTCSeconds(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = SecFromTime(t);
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getMilliseconds(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getMilliseconds(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = msFromTime(LocalTime(t));
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getUTCMilliseconds(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getUTCMilliseconds(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = msFromTime(t);
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_getTimezoneOffset(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_getTimezoneOffset(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    double t = getThisDate(scope, callData);
+    ExecutionEngine *v4 = b->engine();
+    double t = getThisDate(v4, thisObject);
     if (!std::isnan(t))
         t = (t - LocalTime(t)) / msPerMinute;
-    scope.result = Encode(t);
+    return Encode(t);
 }
 
-void DatePrototype::method_setTime(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setTime(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<DateObject> self(scope, callData->thisObject);
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
-    double t = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    CHECK_EXCEPTION();
+    double t = argc ? argv[0].toNumber() : qt_qnan();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
     self->setDate(TimeClip(t));
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setMilliseconds(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setMilliseconds(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<DateObject> self(scope, callData->thisObject);
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = LocalTime(self->date());
-    CHECK_EXCEPTION();
-    double ms = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    CHECK_EXCEPTION();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double ms = argc ? argv[0].toNumber() : qt_qnan();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
     self->setDate(TimeClip(UTC(MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), ms)))));
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setUTCMilliseconds(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setUTCMilliseconds(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = self->date();
-    CHECK_EXCEPTION();
-    double ms = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    CHECK_EXCEPTION();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double ms = argc ? argv[0].toNumber() : qt_qnan();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
     self->setDate(TimeClip(MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), ms))));
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setSeconds(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setSeconds(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = LocalTime(self->date());
-    CHECK_EXCEPTION();
-    double sec = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    CHECK_EXCEPTION();
-    double ms = (callData->argc < 2) ? msFromTime(t) : callData->args[1].toNumber();
-    CHECK_EXCEPTION();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double sec = argc ? argv[0].toNumber() : qt_qnan();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double ms = (argc < 2) ? msFromTime(t) : argv[1].toNumber();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
     t = TimeClip(UTC(MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), sec, ms))));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setUTCSeconds(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setUTCSeconds(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = self->date();
-    double sec = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    double ms = (callData->argc < 2) ? msFromTime(t) : callData->args[1].toNumber();
+    double sec = argc ? argv[0].toNumber() : qt_qnan();
+    double ms = (argc < 2) ? msFromTime(t) : argv[1].toNumber();
     t = TimeClip(MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), sec, ms)));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setMinutes(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setMinutes(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = LocalTime(self->date());
-    CHECK_EXCEPTION();
-    double min = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    CHECK_EXCEPTION();
-    double sec = (callData->argc < 2) ? SecFromTime(t) : callData->args[1].toNumber();
-    CHECK_EXCEPTION();
-    double ms = (callData->argc < 3) ? msFromTime(t) : callData->args[2].toNumber();
-    CHECK_EXCEPTION();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double min = argc ? argv[0].toNumber() : qt_qnan();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double sec = (argc < 2) ? SecFromTime(t) : argv[1].toNumber();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double ms = (argc < 3) ? msFromTime(t) : argv[2].toNumber();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
     t = TimeClip(UTC(MakeDate(Day(t), MakeTime(HourFromTime(t), min, sec, ms))));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setUTCMinutes(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setUTCMinutes(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = self->date();
-    double min = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    double sec = (callData->argc < 2) ? SecFromTime(t) : callData->args[1].toNumber();
-    double ms = (callData->argc < 3) ? msFromTime(t) : callData->args[2].toNumber();
+    double min = argc ? argv[0].toNumber() : qt_qnan();
+    double sec = (argc < 2) ? SecFromTime(t) : argv[1].toNumber();
+    double ms = (argc < 3) ? msFromTime(t) : argv[2].toNumber();
     t = TimeClip(MakeDate(Day(t), MakeTime(HourFromTime(t), min, sec, ms)));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setHours(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setHours(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = LocalTime(self->date());
-    CHECK_EXCEPTION();
-    double hour = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    CHECK_EXCEPTION();
-    double min = (callData->argc < 2) ? MinFromTime(t) : callData->args[1].toNumber();
-    CHECK_EXCEPTION();
-    double sec = (callData->argc < 3) ? SecFromTime(t) : callData->args[2].toNumber();
-    CHECK_EXCEPTION();
-    double ms = (callData->argc < 4) ? msFromTime(t) : callData->args[3].toNumber();
-    CHECK_EXCEPTION();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double hour = argc ? argv[0].toNumber() : qt_qnan();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double min = (argc < 2) ? MinFromTime(t) : argv[1].toNumber();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double sec = (argc < 3) ? SecFromTime(t) : argv[2].toNumber();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double ms = (argc < 4) ? msFromTime(t) : argv[3].toNumber();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
     t = TimeClip(UTC(MakeDate(Day(t), MakeTime(hour, min, sec, ms))));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setUTCHours(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setUTCHours(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = self->date();
-    double hour = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    double min = (callData->argc < 2) ? MinFromTime(t) : callData->args[1].toNumber();
-    double sec = (callData->argc < 3) ? SecFromTime(t) : callData->args[2].toNumber();
-    double ms = (callData->argc < 4) ? msFromTime(t) : callData->args[3].toNumber();
+    double hour = argc ? argv[0].toNumber() : qt_qnan();
+    double min = (argc < 2) ? MinFromTime(t) : argv[1].toNumber();
+    double sec = (argc < 3) ? SecFromTime(t) : argv[2].toNumber();
+    double ms = (argc < 4) ? msFromTime(t) : argv[3].toNumber();
     t = TimeClip(MakeDate(Day(t), MakeTime(hour, min, sec, ms)));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setDate(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setDate(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = LocalTime(self->date());
-    CHECK_EXCEPTION();
-    double date = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    CHECK_EXCEPTION();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double date = argc ? argv[0].toNumber() : qt_qnan();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
     t = TimeClip(UTC(MakeDate(MakeDay(YearFromTime(t), MonthFromTime(t), date), TimeWithinDay(t))));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setUTCDate(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setUTCDate(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = self->date();
-    CHECK_EXCEPTION();
-    double date = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    CHECK_EXCEPTION();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double date = argc ? argv[0].toNumber() : qt_qnan();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
     t = TimeClip(MakeDate(MakeDay(YearFromTime(t), MonthFromTime(t), date), TimeWithinDay(t)));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setMonth(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setMonth(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = LocalTime(self->date());
-    CHECK_EXCEPTION();
-    double month = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    CHECK_EXCEPTION();
-    double date = (callData->argc < 2) ? DateFromTime(t) : callData->args[1].toNumber();
-    CHECK_EXCEPTION();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double month = argc ? argv[0].toNumber() : qt_qnan();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double date = (argc < 2) ? DateFromTime(t) : argv[1].toNumber();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
     t = TimeClip(UTC(MakeDate(MakeDay(YearFromTime(t), month, date), TimeWithinDay(t))));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setUTCMonth(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setUTCMonth(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = self->date();
-    double month = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    double date = (callData->argc < 2) ? DateFromTime(t) : callData->args[1].toNumber();
+    double month = argc ? argv[0].toNumber() : qt_qnan();
+    double date = (argc < 2) ? DateFromTime(t) : argv[1].toNumber();
     t = TimeClip(MakeDate(MakeDay(YearFromTime(t), month, date), TimeWithinDay(t)));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setYear(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setYear(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = self->date();
     if (std::isnan(t))
         t = 0;
     else
         t = LocalTime(t);
-    double year = callData->argc ? callData->args[0].toNumber() : qt_qnan();
+    double year = argc ? argv[0].toNumber() : qt_qnan();
     double r;
     if (std::isnan(year)) {
         r = qt_qnan();
@@ -1326,53 +1387,60 @@ void DatePrototype::method_setYear(const BuiltinFunction *, Scope &scope, CallDa
         r = TimeClip(r);
     }
     self->setDate(r);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setUTCFullYear(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setUTCFullYear(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = self->date();
-    double year = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    double month = (callData->argc < 2) ? MonthFromTime(t) : callData->args[1].toNumber();
-    double date = (callData->argc < 3) ? DateFromTime(t) : callData->args[2].toNumber();
+    double year = argc ? argv[0].toNumber() : qt_qnan();
+    double month = (argc < 2) ? MonthFromTime(t) : argv[1].toNumber();
+    double date = (argc < 3) ? DateFromTime(t) : argv[2].toNumber();
     t = TimeClip(MakeDate(MakeDay(year, month, date), TimeWithinDay(t)));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_setFullYear(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_setFullYear(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = LocalTime(self->date());
-    CHECK_EXCEPTION();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
     if (std::isnan(t))
         t = 0;
-    double year = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    CHECK_EXCEPTION();
-    double month = (callData->argc < 2) ? MonthFromTime(t) : callData->args[1].toNumber();
-    CHECK_EXCEPTION();
-    double date = (callData->argc < 3) ? DateFromTime(t) : callData->args[2].toNumber();
-    CHECK_EXCEPTION();
+    double year = argc ? argv[0].toNumber() : qt_qnan();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double month = (argc < 2) ? MonthFromTime(t) : argv[1].toNumber();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+    double date = (argc < 3) ? DateFromTime(t) : argv[2].toNumber();
+    if (v4->hasException)
+        return QV4::Encode::undefined();
     t = TimeClip(UTC(MakeDate(MakeDay(year, month, date), TimeWithinDay(t))));
     self->setDate(t);
-    scope.result = Encode(self->date());
+    return Encode(self->date());
 }
 
-void DatePrototype::method_toUTCString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_toUTCString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = self->date();
-    scope.result = scope.engine->newString(ToUTCString(t));
+    return Encode(v4->newString(ToUTCString(t)));
 }
 
 static void addZeroPrefixedInt(QString &str, int num, int nDigits)
@@ -1388,21 +1456,22 @@ static void addZeroPrefixedInt(QString &str, int num, int nDigits)
     }
 }
 
-void DatePrototype::method_toISOString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_toISOString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    DateObject *self = callData->thisObject.as<DateObject>();
+    ExecutionEngine *v4 = b->engine();
+    DateObject *self = const_cast<DateObject *>(thisObject->as<DateObject>());
     if (!self)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
     double t = self->date();
     if (!std::isfinite(t))
-        RETURN_RESULT(scope.engine->throwRangeError(callData->thisObject));
+        RETURN_RESULT(v4->throwRangeError(*thisObject));
 
     QString result;
     int year = (int)YearFromTime(t);
     if (year < 0 || year > 9999) {
         if (qAbs(year) >= 1000000)
-            RETURN_RESULT(scope.engine->newString(QStringLiteral("Invalid Date")));
+            RETURN_RESULT(v4->newString(QStringLiteral("Invalid Date")));
         result += year < 0 ? QLatin1Char('-') : QLatin1Char('+');
         year = qAbs(year);
         addZeroPrefixedInt(result, year, 6);
@@ -1423,29 +1492,30 @@ void DatePrototype::method_toISOString(const BuiltinFunction *, Scope &scope, Ca
     addZeroPrefixedInt(result, msFromTime(t), 3);
     result += QLatin1Char('Z');
 
-    scope.result = scope.engine->newString(result);
+    return Encode(v4->newString(result));
 }
 
-void DatePrototype::method_toJSON(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue DatePrototype::method_toJSON(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    ScopedObject O(scope, callData->thisObject.toObject(scope.engine));
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    Scope scope(v4);
+    ScopedObject O(scope, thisObject->toObject(v4));
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     ScopedValue tv(scope, RuntimeHelpers::toPrimitive(O, NUMBER_HINT));
 
     if (tv->isNumber() && !std::isfinite(tv->toNumber()))
-        RETURN_RESULT(Encode::null());
+        return Encode::null();
 
-    ScopedString s(scope, scope.engine->newString(QStringLiteral("toISOString")));
+    ScopedString s(scope, v4->newString(QStringLiteral("toISOString")));
     ScopedValue v(scope, O->get(s));
     FunctionObject *toIso = v->as<FunctionObject>();
 
     if (!toIso)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
-    ScopedCallData cData(scope);
-    cData->thisObject = callData->thisObject;
-    toIso->call(scope, cData);
+    return toIso->call(O, nullptr, 0);
 }
 
 void DatePrototype::timezoneUpdated()
diff --git a/src/qml/jsruntime/qv4dateobject_p.h b/src/qml/jsruntime/qv4dateobject_p.h
index b0373884dd..a4ab0a27ed 100644
--- a/src/qml/jsruntime/qv4dateobject_p.h
+++ b/src/qml/jsruntime/qv4dateobject_p.h
@@ -108,8 +108,8 @@ struct DateCtor: FunctionObject
 {
     V4_OBJECT2(DateCtor, FunctionObject)
 
-    static void construct(const Managed *, Scope &scope, CallData *callData);
-    static void call(const Managed *that, Scope &scope, CallData *);
+    static ReturnedValue callAsConstructor(const FunctionObject *, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int);
 };
 
 struct DatePrototype: Object
@@ -118,57 +118,57 @@ struct DatePrototype: Object
 
     void init(ExecutionEngine *engine, Object *ctor);
 
-    static double getThisDate(Scope &scope, CallData *callData);
-
-    static void method_parse(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_UTC(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_now(const BuiltinFunction *, Scope &scope, CallData *callData);
-
-    static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toDateString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toTimeString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toLocaleString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toLocaleDateString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toLocaleTimeString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_valueOf(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getTime(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getYear(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getFullYear(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getUTCFullYear(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getMonth(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getUTCMonth(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getDate(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getUTCDate(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getDay(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getUTCDay(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getHours(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getUTCHours(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getMinutes(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getUTCMinutes(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getSeconds(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getUTCSeconds(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getMilliseconds(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getUTCMilliseconds(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getTimezoneOffset(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setTime(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setMilliseconds(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setUTCMilliseconds(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setSeconds(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setUTCSeconds(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setMinutes(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setUTCMinutes(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setHours(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setUTCHours(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setDate(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setUTCDate(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setMonth(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setUTCMonth(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setYear(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setFullYear(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_setUTCFullYear(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toUTCString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toISOString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toJSON(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static double getThisDate(ExecutionEngine *v4, const Value *thisObject);
+
+    static ReturnedValue method_parse(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_UTC(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_now(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+
+    static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toDateString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toTimeString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toLocaleString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toLocaleDateString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toLocaleTimeString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_valueOf(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getTime(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getYear(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getFullYear(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getUTCFullYear(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getMonth(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getUTCMonth(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getDate(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getUTCDate(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getDay(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getUTCDay(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getHours(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getUTCHours(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getMinutes(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getUTCMinutes(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getSeconds(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getUTCSeconds(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getMilliseconds(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getUTCMilliseconds(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getTimezoneOffset(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setTime(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setMilliseconds(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setUTCMilliseconds(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setSeconds(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setUTCSeconds(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setMinutes(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setUTCMinutes(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setHours(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setUTCHours(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setDate(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setUTCDate(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setMonth(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setUTCMonth(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setYear(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setFullYear(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_setUTCFullYear(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toUTCString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toISOString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toJSON(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 
     static void timezoneUpdated();
 };
diff --git a/src/qml/jsruntime/qv4engine.cpp b/src/qml/jsruntime/qv4engine.cpp
index 78cc95b98d..c57f39f61c 100644
--- a/src/qml/jsruntime/qv4engine.cpp
+++ b/src/qml/jsruntime/qv4engine.cpp
@@ -81,14 +81,6 @@
 #include <QtCore/QTextStream>
 #include <QDateTime>
 
-#ifdef V4_ENABLE_JIT
-#include "qv4isel_masm_p.h"
-#endif // V4_ENABLE_JIT
-
-#if QT_CONFIG(qml_interpreter)
-#include "qv4isel_moth_p.h"
-#endif
-
 #if USE(PTHREADS)
 #  include <pthread.h>
 #if !defined(Q_OS_INTEGRITY)
@@ -109,9 +101,9 @@ using namespace QV4;
 
 static QBasicAtomicInt engineSerial = Q_BASIC_ATOMIC_INITIALIZER(1);
 
-void throwTypeError(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue throwTypeError(const BuiltinFunction *b, CallData *)
 {
-    scope.result = scope.engine->throwTypeError();
+    return b->engine()->throwTypeError();
 }
 
 
@@ -129,7 +121,7 @@ QQmlEngine *ExecutionEngine::qmlEngine() const
 
 qint32 ExecutionEngine::maxCallDepth = -1;
 
-ExecutionEngine::ExecutionEngine(EvalISelFactory *factory)
+ExecutionEngine::ExecutionEngine()
     : executableAllocator(new QV4::ExecutableAllocator)
     , regExpAllocator(new QV4::ExecutableAllocator)
     , bumperPointerAllocator(new WTF::BumpPointerAllocator)
@@ -149,38 +141,15 @@ ExecutionEngine::ExecutionEngine(EvalISelFactory *factory)
         bool ok = false;
         maxCallDepth = qEnvironmentVariableIntValue("QV4_MAX_CALL_DEPTH", &ok);
         if (!ok || maxCallDepth <= 0) {
+#ifdef QT_NO_DEBUG
             maxCallDepth = 1234;
-        }
-    }
-    Q_ASSERT(maxCallDepth > 0);
-
-    if (!factory) {
-#if QT_CONFIG(qml_interpreter)
-        bool jitDisabled = true;
-
-#ifdef V4_ENABLE_JIT
-        static const bool forceMoth = !qEnvironmentVariableIsEmpty("QV4_FORCE_INTERPRETER") ||
-                                      !OSAllocator::canAllocateExecutableMemory();
-        if (forceMoth) {
-            factory = new Moth::ISelFactory;
-        } else {
-            factory = new JIT::ISelFactory<>;
-            jitDisabled = false;
-        }
-#else // !V4_ENABLE_JIT
-        factory = new Moth::ISelFactory;
-#endif // V4_ENABLE_JIT
-
-        if (jitDisabled) {
-            qWarning("JIT is disabled for QML. Property bindings and animations will be "
-                     "very slow. Visit https://wiki.qt.io/V4 to learn about possible "
-                     "solutions for your platform.");
-        }
 #else
-        factory = new JIT::ISelFactory<>;
+            // no (tail call) optimization is done, so there'll be a lot mare stack frames active
+            maxCallDepth = 200;
 #endif
+        }
     }
-    iselFactory.reset(factory);
+    Q_ASSERT(maxCallDepth > 0);
 
     // reserve space for the JS stack
     // we allow it to grow to a bit more than JSStackLimit, as we can overshoot due to ScopedValues
@@ -219,7 +188,7 @@ ExecutionEngine::ExecutionEngine(EvalISelFactory *factory)
     internalClasses[Class_SimpleArrayData] = internalClasses[EngineBase::Class_Empty]->changeVTable(QV4::SimpleArrayData::staticVTable());
     internalClasses[Class_SparseArrayData] = internalClasses[EngineBase::Class_Empty]->changeVTable(QV4::SparseArrayData::staticVTable());
     internalClasses[Class_ExecutionContext] = internalClasses[EngineBase::Class_Empty]->changeVTable(QV4::ExecutionContext::staticVTable());
-    internalClasses[Class_SimpleCallContext] = internalClasses[EngineBase::Class_Empty]->changeVTable(QV4::CallContext::staticVTable());
+    internalClasses[Class_CallContext] = internalClasses[EngineBase::Class_Empty]->changeVTable(QV4::CallContext::staticVTable());
 
     jsStrings[String_Empty] = newIdentifier(QString());
     jsStrings[String_undefined] = newIdentifier(QStringLiteral("undefined"));
@@ -273,6 +242,8 @@ ExecutionEngine::ExecutionEngine(EvalISelFactory *factory)
     InternalClass *argsClass = newInternalClass(ArgumentsObject::staticVTable(), objectPrototype());
     argsClass = argsClass->addMember(id_length(), Attr_NotEnumerable);
     internalClasses[EngineBase::Class_ArgumentsObject] = argsClass->addMember(id_callee(), Attr_Data|Attr_NotEnumerable);
+    argsClass = newInternalClass(StrictArgumentsObject::staticVTable(), objectPrototype());
+    argsClass = argsClass->addMember(id_length(), Attr_NotEnumerable);
     argsClass = argsClass->addMember(id_callee(), Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable);
     internalClasses[EngineBase::Class_StrictArgumentsObject] = argsClass->addMember(id_caller(), Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable);
 
@@ -425,8 +396,7 @@ ExecutionEngine::ExecutionEngine(EvalISelFactory *factory)
     //
     // set up the global object
     //
-    rootContext()->d()->global.set(scope.engine, globalObject->d());
-    rootContext()->d()->callData->thisObject = globalObject;
+    rootContext()->d()->activation.set(scope.engine, globalObject->d());
     Q_ASSERT(globalObject->d()->vtable());
 
     globalObject->defineDefaultProperty(QStringLiteral("Object"), *objectCtor());
@@ -535,19 +505,11 @@ void ExecutionEngine::setProfiler(Profiling::Profiler *profiler)
 void ExecutionEngine::initRootContext()
 {
     Scope scope(this);
-    Scoped<GlobalContext> r(scope, memoryManager->allocManaged<GlobalContext>(
-                                sizeof(GlobalContext::Data) + sizeof(CallData)));
-    r->d_unchecked()->init(this);
-    r->d()->callData = reinterpret_cast<CallData *>(r->d() + 1);
-    r->d()->callData->tag = quint32(Value::ValueTypeInternal::Integer);
-    r->d()->callData->argc = 0;
-    r->d()->callData->thisObject = globalObject;
-    r->d()->callData->args[0] = Encode::undefined();
+    Scoped<ExecutionContext> r(scope, memoryManager->allocManaged<ExecutionContext>(sizeof(ExecutionContext::Data)));
+    r->d_unchecked()->init(Heap::ExecutionContext::Type_GlobalContext);
+    r->d()->activation.set(this, globalObject->d());
     jsObjects[RootContext] = r;
     jsObjects[IntegerNull] = Encode((int)0);
-
-    currentContext = static_cast<ExecutionContext *>(jsObjects + RootContext);
-    current = currentContext->d();
 }
 
 InternalClass *ExecutionEngine::newClass(const InternalClass &other)
@@ -555,14 +517,6 @@ InternalClass *ExecutionEngine::newClass(const InternalClass &other)
     return new (classPool) InternalClass(other);
 }
 
-ExecutionContext *ExecutionEngine::pushGlobalContext()
-{
-    pushContext(rootContext()->d());
-
-    Q_ASSERT(current == rootContext()->d());
-    return currentContext;
-}
-
 InternalClass *ExecutionEngine::newInternalClass(const VTable *vtable, Object *prototype)
 {
     return internalClasses[EngineBase::Class_Empty]->changeVTable(vtable)->changePrototype(prototype ? prototype->d() : 0);
@@ -633,6 +587,12 @@ Heap::ArrayObject *ExecutionEngine::newArrayObject(const Value *values, int leng
         // this doesn't require a write barrier, things will be ok, when the new array data gets inserted into
         // the parent object
         memcpy(&d->values.values, values, length*sizeof(Value));
+        for (int i = 0; i < length; ++i) {
+            if (values[i].isManaged()) {
+                d->needsMark = true;
+                break;
+            }
+        }
         a->d()->arrayData.set(this, d);
         a->setArrayLengthUnchecked(length);
     }
@@ -685,9 +645,9 @@ Heap::DateObject *ExecutionEngine::newDateObjectFromTime(const QTime &t)
 
 Heap::RegExpObject *ExecutionEngine::newRegExpObject(const QString &pattern, int flags)
 {
-    bool global = (flags & IR::RegExp::RegExp_Global);
-    bool ignoreCase = (flags & IR::RegExp::RegExp_IgnoreCase);
-    bool multiline = (flags & IR::RegExp::RegExp_Multiline);
+    bool global = (flags & QV4::CompiledData::RegExp::RegExp_Global);
+    bool ignoreCase = (flags & QV4::CompiledData::RegExp::RegExp_IgnoreCase);
+    bool multiline = (flags & QV4::CompiledData::RegExp::RegExp_Multiline);
 
     Scope scope(this);
     Scoped<RegExp> re(scope, RegExp::create(this, pattern, ignoreCase, multiline, global));
@@ -760,11 +720,9 @@ Heap::Object *ExecutionEngine::newForEachIteratorObject(Object *o)
 
 Heap::QmlContext *ExecutionEngine::qmlContext() const
 {
-    Heap::ExecutionContext *ctx = current;
-
-    // get the correct context when we're within a builtin function
-    if (ctx->type == Heap::ExecutionContext::Type_SimpleCallContext && !ctx->outer)
-        ctx = parentContext(currentContext)->d();
+    if (!currentStackFrame)
+        return 0;
+    Heap::ExecutionContext *ctx = currentContext()->d();
 
     if (ctx->type != Heap::ExecutionContext::Type_QmlContext && !ctx->outer)
         return 0;
@@ -785,7 +743,7 @@ QObject *ExecutionEngine::qmlScopeObject() const
     if (!ctx)
         return 0;
 
-    return ctx->qml->scopeObject;
+    return ctx->qml()->scopeObject;
 }
 
 ReturnedValue ExecutionEngine::qmlSingletonWrapper(String *name)
@@ -815,57 +773,56 @@ QQmlContextData *ExecutionEngine::callingQmlContext() const
     if (!ctx)
         return 0;
 
-    return ctx->qml->context->contextData();
+    return ctx->qml()->context->contextData();
 }
 
-QVector<StackFrame> ExecutionEngine::stackTrace(int frameLimit) const
+QString CppStackFrame::source() const
 {
-    Scope scope(const_cast<ExecutionEngine *>(this));
-    ScopedString name(scope);
-    QVector<StackFrame> stack;
-
-    ExecutionContext *c = currentContext;
-    while (c && frameLimit) {
-        QV4::Function *function = c->getFunction();
-        if (function) {
-            StackFrame frame;
-            frame.source = function->sourceFile();
-            name = function->name();
-            frame.function = name->toQString();
-
-            // line numbers can be negative for places where you can't set a real breakpoint
-            frame.line = qAbs(c->d()->lineNumber);
-            frame.column = -1;
-
-            stack.append(frame);
-            --frameLimit;
-        }
-        c = parentContext(c);
-    }
-
-    if (frameLimit && globalCode) {
-        StackFrame frame;
-        frame.source = globalCode->sourceFile();
-        frame.function = globalCode->name()->toQString();
-        frame.line = rootContext()->d()->lineNumber;
-        frame.column = -1;
+    return v4Function->sourceFile();
+}
 
-        stack.append(frame);
-    }
-    return stack;
+QString CppStackFrame::function() const
+{
+    return v4Function->name()->toQString();
 }
 
-StackFrame ExecutionEngine::currentStackFrame() const
+int CppStackFrame::lineNumber() const
 {
-    StackFrame frame;
-    frame.line = -1;
-    frame.column = -1;
+    auto findLine = [](const CompiledData::CodeOffsetToLine &entry, uint offset) {
+        return entry.codeOffset < offset;
+    };
+
+    const QV4::CompiledData::Function *cf = v4Function->compiledFunction;
+    uint offset = instructionPointer;
+    const CompiledData::CodeOffsetToLine *lineNumbers = cf->lineNumberTable();
+    uint nLineNumbers = cf->nLineNumbers;
+    const CompiledData::CodeOffsetToLine *line = std::lower_bound(lineNumbers, lineNumbers + nLineNumbers, offset, findLine) - 1;
+    return line->line;
+}
 
-    QVector<StackFrame> trace = stackTrace(/*limit*/ 1);
-    if (!trace.isEmpty())
-        frame = trace.first();
+ReturnedValue CppStackFrame::thisObject() const {
+    return jsFrame->thisObject.asReturnedValue();
+}
 
-    return frame;
+StackTrace ExecutionEngine::stackTrace(int frameLimit) const
+{
+    Scope scope(const_cast<ExecutionEngine *>(this));
+    ScopedString name(scope);
+    StackTrace stack;
+
+    CppStackFrame *f = currentStackFrame;
+    while (f && frameLimit) {
+        QV4::StackFrame frame;
+        frame.source = f->source();
+        frame.function = f->function();
+        frame.line = qAbs(f->lineNumber());
+        frame.column = -1;
+        stack.append(frame);
+        --frameLimit;
+        f = f->parent;
+    }
+
+    return stack;
 }
 
 /* Helper and "C" linkage exported function to format a GDBMI stacktrace for
@@ -908,14 +865,13 @@ QUrl ExecutionEngine::resolvedUrl(const QString &file)
         return src;
 
     QUrl base;
-    ExecutionContext *c = currentContext;
-    while (c) {
-        SimpleCallContext *callCtx = c->asSimpleCallContext();
-        if (callCtx && callCtx->d()->v4Function) {
-            base.setUrl(callCtx->d()->v4Function->sourceFile());
+    CppStackFrame *f = currentStackFrame;
+    while (f) {
+        if (f->v4Function) {
+            base.setUrl(f->v4Function->sourceFile());
             break;
         }
-        c = parentContext(c);
+        f = f->parent;
     }
 
     if (base.isEmpty() && globalCode)
@@ -1589,9 +1545,13 @@ QV4::ReturnedValue ExecutionEngine::metaTypeToJS(int type, const void *data)
     return 0;
 }
 
-void ExecutionEngine::failStackLimitCheck(Scope &scope)
+bool ExecutionEngine::canJIT()
 {
-    scope.result = throwRangeError(QStringLiteral("Maximum call stack size exceeded."));
+#ifdef V4_ENABLE_JIT
+    return true;
+#else
+    return false;
+#endif
 }
 
 // Converts a JS value to a meta-type.
diff --git a/src/qml/jsruntime/qv4engine_p.h b/src/qml/jsruntime/qv4engine_p.h
index e4ac51efed..e143fe2de2 100644
--- a/src/qml/jsruntime/qv4engine_p.h
+++ b/src/qml/jsruntime/qv4engine_p.h
@@ -51,7 +51,6 @@
 //
 
 #include "qv4global_p.h"
-#include "private/qv4isel_p.h"
 #include "qv4managed_p.h"
 #include "qv4context_p.h"
 #include <private/qintrusivelist_p.h>
@@ -89,6 +88,32 @@ struct CompilationUnit;
 struct InternalClass;
 struct InternalClassPool;
 
+struct Q_QML_EXPORT CppStackFrame {
+    CppStackFrame *parent;
+    Function *v4Function;
+    CallData *jsFrame;
+    const Value *originalArguments;
+    int originalArgumentsCount;
+    int instructionPointer;
+
+    QString source() const;
+    QString function() const;
+    inline QV4::ExecutionContext *context() const {
+        return static_cast<ExecutionContext *>(&jsFrame->context);
+    }
+    int lineNumber() const;
+
+    inline QV4::Heap::CallContext *callContext() const {
+        Heap::ExecutionContext *ctx = static_cast<ExecutionContext &>(jsFrame->context).d();\
+        while (ctx->type != Heap::ExecutionContext::Type_CallContext)
+            ctx = ctx->outer;
+        return static_cast<Heap::CallContext *>(ctx);
+    }
+    ReturnedValue thisObject() const;
+};
+
+
+
 struct Q_QML_EXPORT ExecutionEngine : public EngineBase
 {
 private:
@@ -100,7 +125,6 @@ private:
 public:
     ExecutableAllocator *executableAllocator;
     ExecutableAllocator *regExpAllocator;
-    QScopedPointer<EvalISelFactory> iselFactory;
 
     WTF::BumpPointerAllocator *bumperPointerAllocator; // Used by Yarr Regex engine.
 
@@ -183,7 +207,7 @@ public:
     Value *jsObjects;
     enum { NTypedArrayTypes = 9 }; // == TypedArray::NValues, avoid header dependency
 
-    GlobalContext *rootContext() const { return reinterpret_cast<GlobalContext *>(jsObjects + RootContext); }
+    ExecutionContext *rootContext() const { return reinterpret_cast<ExecutionContext *>(jsObjects + RootContext); }
     FunctionObject *objectCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Object_Ctor); }
     FunctionObject *stringCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + String_Ctor); }
     FunctionObject *numberCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Number_Ctor); }
@@ -342,7 +366,7 @@ public:
     // bookkeeping.
     MultiplyWrappedQObjectMap *m_multiplyWrappedQObjects;
 
-    ExecutionEngine(EvalISelFactory *iselFactory = 0);
+    ExecutionEngine();
     ~ExecutionEngine();
 
 #if !QT_CONFIG(qml_debug)
@@ -359,11 +383,10 @@ public:
     void setProfiler(Profiling::Profiler *profiler);
 #endif // QT_CONFIG(qml_debug)
 
-    ExecutionContext *pushGlobalContext();
-    void pushContext(Heap::ExecutionContext *context);
-    void pushContext(ExecutionContext *context);
-    void popContext();
-    ExecutionContext *parentContext(ExecutionContext *context) const;
+    void setCurrentContext(Heap::ExecutionContext *context);
+    ExecutionContext *currentContext() const {
+        return static_cast<ExecutionContext *>(&currentStackFrame->jsFrame->context);
+    }
 
     InternalClass *newInternalClass(const VTable *vtable, Object *prototype);
 
@@ -413,7 +436,6 @@ public:
 
 
     StackTrace stackTrace(int frameLimit = -1) const;
-    StackFrame currentStackFrame() const;
     QUrl resolvedUrl(const QString &file);
 
     void requireArgumentsAccessors(int n);
@@ -424,8 +446,6 @@ public:
 
     InternalClass *newClass(const InternalClass &other);
 
-    // Exception handling
-    Value *exceptionValue;
     StackTrace exceptionStackTrace;
 
     ReturnedValue throwError(const Value &value);
@@ -455,11 +475,11 @@ public:
     bool metaTypeFromJS(const Value *value, int type, void *data);
     QV4::ReturnedValue metaTypeToJS(int type, const void *data);
 
-    bool checkStackLimits(Scope &scope);
+    bool checkStackLimits();
 
-private:
-    void failStackLimitCheck(Scope &scope);
+    static bool canJIT();
 
+private:
 #if QT_CONFIG(qml_debug)
     QScopedPointer<QV4::Debugging::Debugger> m_debugger;
     QScopedPointer<QV4::Profiling::Profiler> m_profiler;
@@ -477,71 +497,12 @@ struct NoThrowEngine;
 #endif
 
 
-inline void ExecutionEngine::pushContext(Heap::ExecutionContext *context)
-{
-    Q_ASSERT(currentContext && context);
-    Value *v = jsAlloca(2);
-    v[0] = Encode(context);
-    v[1] = Encode((int)(v - static_cast<Value *>(currentContext)));
-    currentContext = static_cast<ExecutionContext *>(v);
-    current = currentContext->d();
-}
-
-inline void ExecutionEngine::pushContext(ExecutionContext *context)
-{
-    pushContext(context->d());
-}
-
-
-inline void ExecutionEngine::popContext()
-{
-    Q_ASSERT(jsStackTop > currentContext);
-    QV4::Value *offset = (currentContext + 1);
-    Q_ASSERT(offset->isInteger());
-    int o = offset->integerValue();
-    Q_ASSERT(o);
-    currentContext -= o;
-    current = currentContext->d();
-}
-
-inline ExecutionContext *ExecutionEngine::parentContext(ExecutionContext *context) const
-{
-    Value *offset = static_cast<Value *>(context) + 1;
-    Q_ASSERT(offset->isInteger());
-    int o = offset->integerValue();
-    return o ? context - o : 0;
-}
-
-inline
-void Heap::Base::mark(QV4::MarkStack *markStack)
-{
-    Q_ASSERT(inUse());
-    const HeapItem *h = reinterpret_cast<const HeapItem *>(this);
-    Chunk *c = h->chunk();
-    size_t index = h - c->realBase();
-    Q_ASSERT(!Chunk::testBit(c->extendsBitmap, index));
-    quintptr *bitmap = c->blackBitmap + Chunk::bitmapIndex(index);
-    quintptr bit = Chunk::bitForIndex(index);
-    if (!(*bitmap & bit)) {
-        *bitmap |= bit;
-        markStack->push(this);
-    }
-}
-
-inline void Value::mark(MarkStack *markStack)
-{
-    Heap::Base *o = heapObject();
-    if (o)
-        o->mark(markStack);
-}
-
-inline void Managed::mark(MarkStack *markStack)
+inline void ExecutionEngine::setCurrentContext(Heap::ExecutionContext *context)
 {
-    Q_ASSERT(m());
-    m()->mark(markStack);
+    currentStackFrame->jsFrame->context = context;
 }
 
-#define CHECK_STACK_LIMITS(v4, scope) if ((v4)->checkStackLimits(scope)) return; \
+#define CHECK_STACK_LIMITS(v4) if ((v4)->checkStackLimits()) return Encode::undefined(); \
     ExecutionEngineCallDepthRecorder _executionEngineCallDepthRecorder(v4);
 
 struct ExecutionEngineCallDepthRecorder
@@ -552,10 +513,10 @@ struct ExecutionEngineCallDepthRecorder
     ~ExecutionEngineCallDepthRecorder() { --ee->callDepth; }
 };
 
-inline bool ExecutionEngine::checkStackLimits(Scope &scope)
+inline bool ExecutionEngine::checkStackLimits()
 {
     if (Q_UNLIKELY((jsStackTop > jsStackLimit) || (callDepth >= maxCallDepth))) {
-        failStackLimitCheck(scope);
+        throwRangeError(QStringLiteral("Maximum call stack size exceeded."));
         return true;
     }
 
diff --git a/src/qml/jsruntime/qv4enginebase_p.h b/src/qml/jsruntime/qv4enginebase_p.h
index 88f9dfd85c..e0f5f3ffb1 100644
--- a/src/qml/jsruntime/qv4enginebase_p.h
+++ b/src/qml/jsruntime/qv4enginebase_p.h
@@ -57,31 +57,36 @@ QT_BEGIN_NAMESPACE
 
 namespace QV4 {
 
+struct CppStackFrame;
+
 // Base class for the execution engine
 
 #if defined(Q_CC_MSVC) || defined(Q_CC_GNU)
 #pragma pack(push, 1)
 #endif
-struct EngineBase {
-    Heap::ExecutionContext *current = 0;
+struct Q_QML_EXPORT EngineBase {
+
+    CppStackFrame *currentStackFrame = nullptr;
 
-    Value *jsStackTop = 0;
+    Value *jsStackTop = nullptr;
     quint8 hasException = false;
     quint8 writeBarrierActive = false;
     quint16 unused = 0;
 #if QT_POINTER_SIZE == 8
     quint8 padding[4];
 #endif
-    MemoryManager *memoryManager = 0;
+    MemoryManager *memoryManager = nullptr;
     Runtime runtime;
 
     qint32 callDepth = 0;
-    Value *jsStackLimit = 0;
-    Value *jsStackBase = 0;
+    Value *jsStackLimit = nullptr;
+    Value *jsStackBase = nullptr;
+
+    IdentifierTable *identifierTable = nullptr;
+    Object *globalObject = nullptr;
 
-    ExecutionContext *currentContext = 0;
-    IdentifierTable *identifierTable = 0;
-    Object *globalObject = 0;
+    // Exception handling
+    Value *exceptionValue = nullptr;
 
     enum {
         Class_Empty,
@@ -90,7 +95,7 @@ struct EngineBase {
         Class_SimpleArrayData,
         Class_SparseArrayData,
         Class_ExecutionContext,
-        Class_SimpleCallContext,
+        Class_CallContext,
         Class_Object,
         Class_ArrayObject,
         Class_FunctionObject,
@@ -115,8 +120,8 @@ struct EngineBase {
 #endif
 
 Q_STATIC_ASSERT(std::is_standard_layout<EngineBase>::value);
-Q_STATIC_ASSERT(offsetof(EngineBase, current) == 0);
-Q_STATIC_ASSERT(offsetof(EngineBase, jsStackTop) == offsetof(EngineBase, current) + QT_POINTER_SIZE);
+Q_STATIC_ASSERT(offsetof(EngineBase, currentStackFrame) == 0);
+Q_STATIC_ASSERT(offsetof(EngineBase, jsStackTop) == offsetof(EngineBase, currentStackFrame) + QT_POINTER_SIZE);
 Q_STATIC_ASSERT(offsetof(EngineBase, hasException) == offsetof(EngineBase, jsStackTop) + QT_POINTER_SIZE);
 Q_STATIC_ASSERT(offsetof(EngineBase, memoryManager) == offsetof(EngineBase, hasException) + QT_POINTER_SIZE);
 Q_STATIC_ASSERT(offsetof(EngineBase, runtime) == offsetof(EngineBase, memoryManager) + QT_POINTER_SIZE);
diff --git a/src/qml/jsruntime/qv4errorobject.cpp b/src/qml/jsruntime/qv4errorobject.cpp
index b3bd28e18b..90e158ba37 100644
--- a/src/qml/jsruntime/qv4errorobject.cpp
+++ b/src/qml/jsruntime/qv4errorobject.cpp
@@ -51,7 +51,6 @@
 #include <private/qqmljslexer_p.h>
 #include <private/qqmljsparser_p.h>
 #include <private/qqmljsast_p.h>
-#include <qv4jsir_p.h>
 #include <qv4codegen_p.h>
 
 #ifndef Q_OS_WIN
@@ -107,6 +106,7 @@ void Heap::ErrorObject::init(const Value &message, ErrorType t)
 
 void Heap::ErrorObject::init(const Value &message, const QString &fileName, int line, int column, ErrorObject::ErrorType t)
 {
+    Q_UNUSED(fileName); // ####
     Object::init();
     errorType = t;
 
@@ -123,10 +123,9 @@ void Heap::ErrorObject::init(const Value &message, const QString &fileName, int
     frame.column = column;
     e->d()->stackTrace->prepend(frame);
 
-    if (!e->d()->stackTrace->isEmpty()) {
-        setProperty(scope.engine, QV4::ErrorObject::Index_FileName, scope.engine->newString(e->d()->stackTrace->at(0).source));
-        setProperty(scope.engine, QV4::ErrorObject::Index_LineNumber, Primitive::fromInt32(e->d()->stackTrace->at(0).line));
-    }
+    Q_ASSERT(!e->d()->stackTrace->isEmpty());
+    setProperty(scope.engine, QV4::ErrorObject::Index_FileName, scope.engine->newString(e->d()->stackTrace->at(0).source));
+    setProperty(scope.engine, QV4::ErrorObject::Index_LineNumber, Primitive::fromInt32(e->d()->stackTrace->at(0).line));
 
     if (!message.isUndefined())
         setProperty(scope.engine, QV4::ErrorObject::Index_Message, message);
@@ -153,11 +152,12 @@ const char *ErrorObject::className(Heap::ErrorObject::ErrorType t)
     Q_UNREACHABLE();
 }
 
-void ErrorObject::method_get_stack(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ErrorObject::method_get_stack(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Scoped<ErrorObject> This(scope, callData->thisObject);
+    ExecutionEngine *v4 = b->engine();
+    const ErrorObject *This = thisObject->as<ErrorObject>();
     if (!This)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
     if (!This->d()->stack) {
         QString trace;
         for (int i = 0; i < This->d()->stackTrace->count(); ++i) {
@@ -168,9 +168,9 @@ void ErrorObject::method_get_stack(const BuiltinFunction *, Scope &scope, CallDa
             if (frame.line >= 0)
                 trace += QLatin1Char(':') + QString::number(frame.line);
         }
-        This->d()->stack.set(scope.engine, scope.engine->newString(trace));
+        This->d()->stack.set(v4, v4->newString(trace));
     }
-    scope.result = This->d()->stack;
+    return This->d()->stack->asReturnedValue();
 }
 
 DEFINE_OBJECT_VTABLE(ErrorObject);
@@ -233,15 +233,15 @@ void Heap::ErrorCtor::init(QV4::ExecutionContext *scope, const QString &name)
     Heap::FunctionObject::init(scope, name);
 }
 
-void ErrorCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue ErrorCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    ScopedValue v(scope, callData->argument(0));
-    scope.result = ErrorObject::create<ErrorObject>(scope.engine, v);
+    Value v = argc ? *argv : Primitive::undefinedValue();
+    return ErrorObject::create<ErrorObject>(f->engine(), v)->asReturnedValue();
 }
 
-void ErrorCtor::call(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue ErrorCtor::call(const FunctionObject *f, const Value *, const Value *argv, int argc)
 {
-    static_cast<const Object *>(that)->construct(scope, callData);
+    return f->callAsConstructor(argv, argc);
 }
 
 void Heap::EvalErrorCtor::init(QV4::ExecutionContext *scope)
@@ -249,10 +249,10 @@ void Heap::EvalErrorCtor::init(QV4::ExecutionContext *scope)
     Heap::ErrorCtor::init(scope, QStringLiteral("EvalError"));
 }
 
-void EvalErrorCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue EvalErrorCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    ScopedValue v(scope, callData->argument(0));
-    scope.result = ErrorObject::create<EvalErrorObject>(scope.engine, v);
+    Value v = argc ? *argv : Primitive::undefinedValue();
+    return ErrorObject::create<EvalErrorObject>(f->engine(), v)->asReturnedValue();
 }
 
 void Heap::RangeErrorCtor::init(QV4::ExecutionContext *scope)
@@ -260,10 +260,10 @@ void Heap::RangeErrorCtor::init(QV4::ExecutionContext *scope)
     Heap::ErrorCtor::init(scope, QStringLiteral("RangeError"));
 }
 
-void RangeErrorCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue RangeErrorCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    ScopedValue v(scope, callData->argument(0));
-    scope.result = ErrorObject::create<RangeErrorObject>(scope.engine, v);
+    Value v = argc ? *argv : Primitive::undefinedValue();
+    return ErrorObject::create<RangeErrorObject>(f->engine(), v)->asReturnedValue();
 }
 
 void Heap::ReferenceErrorCtor::init(QV4::ExecutionContext *scope)
@@ -271,10 +271,10 @@ void Heap::ReferenceErrorCtor::init(QV4::ExecutionContext *scope)
     Heap::ErrorCtor::init(scope, QStringLiteral("ReferenceError"));
 }
 
-void ReferenceErrorCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue ReferenceErrorCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    ScopedValue v(scope, callData->argument(0));
-    scope.result = ErrorObject::create<ReferenceErrorObject>(scope.engine, v);
+    Value v = argc ? *argv : Primitive::undefinedValue();
+    return ErrorObject::create<ReferenceErrorObject>(f->engine(), v)->asReturnedValue();
 }
 
 void Heap::SyntaxErrorCtor::init(QV4::ExecutionContext *scope)
@@ -282,10 +282,10 @@ void Heap::SyntaxErrorCtor::init(QV4::ExecutionContext *scope)
     Heap::ErrorCtor::init(scope, QStringLiteral("SyntaxError"));
 }
 
-void SyntaxErrorCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue SyntaxErrorCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    ScopedValue v(scope, callData->argument(0));
-    scope.result = ErrorObject::create<SyntaxErrorObject>(scope.engine, v);
+    Value v = argc ? *argv : Primitive::undefinedValue();
+    return ErrorObject::create<SyntaxErrorObject>(f->engine(), v)->asReturnedValue();
 }
 
 void Heap::TypeErrorCtor::init(QV4::ExecutionContext *scope)
@@ -293,10 +293,10 @@ void Heap::TypeErrorCtor::init(QV4::ExecutionContext *scope)
     Heap::ErrorCtor::init(scope, QStringLiteral("TypeError"));
 }
 
-void TypeErrorCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue TypeErrorCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    ScopedValue v(scope, callData->argument(0));
-    scope.result = ErrorObject::create<TypeErrorObject>(scope.engine, v);
+    Value v = argc ? *argv : Primitive::undefinedValue();
+    return ErrorObject::create<TypeErrorObject>(f->engine(), v)->asReturnedValue();
 }
 
 void Heap::URIErrorCtor::init(QV4::ExecutionContext *scope)
@@ -304,10 +304,10 @@ void Heap::URIErrorCtor::init(QV4::ExecutionContext *scope)
     Heap::ErrorCtor::init(scope, QStringLiteral("URIError"));
 }
 
-void URIErrorCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue URIErrorCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    ScopedValue v(scope, callData->argument(0));
-    scope.result = ErrorObject::create<URIErrorObject>(scope.engine, v);
+    Value v = argc ? *argv : Primitive::undefinedValue();
+    return ErrorObject::create<URIErrorObject>(f->engine(), v)->asReturnedValue();
 }
 
 void ErrorPrototype::init(ExecutionEngine *engine, Object *ctor, Object *obj, Heap::ErrorObject::ErrorType t)
@@ -323,12 +323,14 @@ void ErrorPrototype::init(ExecutionEngine *engine, Object *ctor, Object *obj, He
     obj->defineDefaultProperty(engine->id_toString(), method_toString, 0);
 }
 
-void ErrorPrototype::method_toString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ErrorPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Object *o = callData->thisObject.as<Object>();
+    ExecutionEngine *v4 = b->engine();
+    const Object *o = thisObject->as<Object>();
     if (!o)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
+    Scope scope(v4);
     ScopedValue name(scope, o->get(scope.engine->id_name()));
     QString qname;
     if (name->isUndefined())
@@ -351,5 +353,5 @@ void ErrorPrototype::method_toString(const BuiltinFunction *, Scope &scope, Call
         str = qname + QLatin1String(": ") + qmessage;
     }
 
-    scope.result = scope.engine->newString(str)->asReturnedValue();
+    return scope.engine->newString(str)->asReturnedValue();
 }
diff --git a/src/qml/jsruntime/qv4errorobject_p.h b/src/qml/jsruntime/qv4errorobject_p.h
index d556617b48..a5ee0eb886 100644
--- a/src/qml/jsruntime/qv4errorobject_p.h
+++ b/src/qml/jsruntime/qv4errorobject_p.h
@@ -67,7 +67,7 @@ namespace Heap {
     Member(class, Pointer, String *, stack)
 
 DECLARE_HEAP_OBJECT(ErrorObject, Object) {
-    DECLARE_MARK_TABLE(ErrorObject);
+    DECLARE_MARKOBJECTS(ErrorObject);
     enum ErrorType {
         Error,
         EvalError,
@@ -175,7 +175,7 @@ struct ErrorObject: Object {
 
     static const char *className(Heap::ErrorObject::ErrorType t);
 
-    static void method_get_stack(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_get_stack(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 template<>
@@ -229,50 +229,50 @@ struct ErrorCtor: FunctionObject
 {
     V4_OBJECT2(ErrorCtor, FunctionObject)
 
-    static void construct(const Managed *, Scope &scope, CallData *callData);
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct EvalErrorCtor: ErrorCtor
 {
     V4_OBJECT2(EvalErrorCtor, ErrorCtor)
 
-    static void construct(const Managed *m, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
 };
 
 struct RangeErrorCtor: ErrorCtor
 {
     V4_OBJECT2(RangeErrorCtor, ErrorCtor)
 
-    static void construct(const Managed *, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
 };
 
 struct ReferenceErrorCtor: ErrorCtor
 {
     V4_OBJECT2(ReferenceErrorCtor, ErrorCtor)
 
-    static void construct(const Managed *m, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
 };
 
 struct SyntaxErrorCtor: ErrorCtor
 {
     V4_OBJECT2(SyntaxErrorCtor, ErrorCtor)
 
-    static void construct(const Managed *m, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
 };
 
 struct TypeErrorCtor: ErrorCtor
 {
     V4_OBJECT2(TypeErrorCtor, ErrorCtor)
 
-    static void construct(const Managed *m, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
 };
 
 struct URIErrorCtor: ErrorCtor
 {
     V4_OBJECT2(URIErrorCtor, ErrorCtor)
 
-    static void construct(const Managed *m, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
 };
 
 
@@ -286,7 +286,7 @@ struct ErrorPrototype : ErrorObject
     void init(ExecutionEngine *engine, Object *ctor) { init(engine, ctor, this, Heap::ErrorObject::Error); }
 
     static void init(ExecutionEngine *engine, Object *ctor, Object *obj, Heap::ErrorObject::ErrorType t);
-    static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct EvalErrorPrototype : ErrorObject
diff --git a/src/qml/jsruntime/qv4function.cpp b/src/qml/jsruntime/qv4function.cpp
index 4b88d85e68..83e861138b 100644
--- a/src/qml/jsruntime/qv4function.cpp
+++ b/src/qml/jsruntime/qv4function.cpp
@@ -38,6 +38,7 @@
 ****************************************************************************/
 
 #include "qv4function_p.h"
+#include "qv4functionobject_p.h"
 #include "qv4managed_p.h"
 #include "qv4string_p.h"
 #include "qv4value_p.h"
@@ -45,76 +46,83 @@
 #include "qv4lookup_p.h"
 #include <private/qv4mm_p.h>
 #include <private/qv4identifiertable_p.h>
+#include <assembler/MacroAssemblerCodeRef.h>
 
 QT_BEGIN_NAMESPACE
 
 using namespace QV4;
 
-Function::Function(ExecutionEngine *engine, CompiledData::CompilationUnit *unit, const CompiledData::Function *function,
-                   ReturnedValue (*codePtr)(ExecutionEngine *, const uchar *))
+Function::Function(ExecutionEngine *engine, CompiledData::CompilationUnit *unit, const CompiledData::Function *function, Code codePtr)
         : compiledFunction(function)
         , compilationUnit(unit)
         , code(codePtr)
-        , codeData(0)
+        , codeData(function->code())
+        , jittedCode(nullptr)
+        , codeRef(nullptr)
         , hasQmlDependencies(function->hasQmlDependencies())
 {
-    internalClass = engine->internalClasses[EngineBase::Class_Empty];
-    const quint32_le *formalsIndices = compiledFunction->formalsTable();
-    // iterate backwards, so we get the right ordering for duplicate names
-    Scope scope(engine);
-    ScopedString arg(scope);
-    for (int i = static_cast<int>(compiledFunction->nFormals - 1); i >= 0; --i) {
-        arg = compilationUnit->runtimeStrings[formalsIndices[i]];
-        while (1) {
-            InternalClass *newClass = internalClass->addMember(arg, Attr_NotConfigurable);
-            if (newClass != internalClass) {
-                internalClass = newClass;
-                break;
-            }
-            // duplicate arguments, need some trick to store them
-            MemoryManager *mm = engine->memoryManager;
-            arg = mm->alloc<String>(arg->d(), engine->newString(QString(0xfffe)));
-        }
-    }
-    nFormals = compiledFunction->nFormals;
+    Q_UNUSED(engine);
+
+    internalClass = engine->internalClasses[EngineBase::Class_CallContext];
 
+    // first locals
     const quint32_le *localsIndices = compiledFunction->localsTable();
     for (quint32 i = 0; i < compiledFunction->nLocals; ++i)
         internalClass = internalClass->addMember(engine->identifierTable->identifier(compilationUnit->runtimeStrings[localsIndices[i]]), Attr_NotConfigurable);
 
-    canUseSimpleCall = compiledFunction->flags & CompiledData::Function::CanUseSimpleCall;
+    const quint32_le *formalsIndices = compiledFunction->formalsTable();
+    for (quint32 i = 0; i < compiledFunction->nFormals; ++i)
+        internalClass = internalClass->addMember(engine->identifierTable->identifier(compilationUnit->runtimeStrings[formalsIndices[i]]), Attr_NotConfigurable);
+
+    nFormals = compiledFunction->nFormals;
 }
 
 Function::~Function()
 {
+    delete codeRef;
 }
 
 void Function::updateInternalClass(ExecutionEngine *engine, const QList<QByteArray> &parameters)
 {
-    internalClass = engine->internalClasses[EngineBase::Class_Empty];
+    QStringList parameterNames;
 
-    // iterate backwards, so we get the right ordering for duplicate names
-    Scope scope(engine);
-    ScopedString arg(scope);
-    for (int i = parameters.size() - 1; i >= 0; --i) {
-        arg = engine->newString(QString::fromUtf8(parameters.at(i)));
-        while (1) {
-            InternalClass *newClass = internalClass->addMember(arg, Attr_NotConfigurable);
-            if (newClass != internalClass) {
-                internalClass = newClass;
+    // Resolve duplicate parameter names:
+    for (int i = 0, ei = parameters.count(); i != ei; ++i) {
+        const QByteArray &param = parameters.at(i);
+        int duplicate = -1;
+
+        for (int j = i - 1; j >= 0; --j) {
+            const QByteArray &prevParam = parameters.at(j);
+            if (param == prevParam) {
+                duplicate = j;
                 break;
             }
-            // duplicate arguments, need some trick to store them
-            arg = engine->memoryManager->alloc<String>(arg->d(), engine->newString(QString(0xfffe)));
         }
+
+        if (duplicate == -1) {
+            parameterNames.append(QString::fromUtf8(param));
+        } else {
+            const QString &dup = parameterNames[duplicate];
+            parameterNames.append(dup);
+            parameterNames[duplicate] =
+                    QString(0xfffe) + QString::number(duplicate) + dup;
+        }
+
+    }
+
+    internalClass = engine->internalClasses[EngineBase::Class_CallContext];
+
+    Scope scope(engine);
+    ScopedString arg(scope);
+    for (const QString &parameterName : parameterNames) {
+        arg = engine->newString(parameterName);
+        internalClass = internalClass->addMember(arg, Attr_NotConfigurable);
     }
     nFormals = parameters.size();
 
     const quint32_le *localsIndices = compiledFunction->localsTable();
     for (quint32 i = 0; i < compiledFunction->nLocals; ++i)
         internalClass = internalClass->addMember(engine->identifierTable->identifier(compilationUnit->runtimeStrings[localsIndices[i]]), Attr_NotConfigurable);
-
-    canUseSimpleCall = false;
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/jsruntime/qv4function_p.h b/src/qml/jsruntime/qv4function_p.h
index b11c8af94a..0e61be5115 100644
--- a/src/qml/jsruntime/qv4function_p.h
+++ b/src/qml/jsruntime/qv4function_p.h
@@ -54,6 +54,11 @@
 #include <private/qqmlglobal_p.h>
 #include <private/qv4compileddata_p.h>
 #include <private/qv4context_p.h>
+#include <private/qv4vme_moth_p.h>
+
+namespace JSC {
+class MacroAssemblerCodeRef;
+}
 
 QT_BEGIN_NAMESPACE
 
@@ -63,17 +68,24 @@ struct Q_QML_EXPORT Function {
     const CompiledData::Function *compiledFunction;
     CompiledData::CompilationUnit *compilationUnit;
 
-    ReturnedValue (*code)(ExecutionEngine *, const uchar *);
+    ReturnedValue call(const Value *thisObject, const Value *argv, int argc, const ExecutionContext *context) {
+        return Moth::VME::exec(this, thisObject, argv, argc, context);
+    }
+
+    typedef ReturnedValue (*Code)(const FunctionObject *fo, const Value *thisObject, const Value *argv, int argc);
+    Code code;
     const uchar *codeData;
 
+    typedef ReturnedValue (*JittedCode)(CppStackFrame *, ExecutionEngine *);
+    JittedCode jittedCode;
+    JSC::MacroAssemblerCodeRef *codeRef;
+
     // first nArguments names in internalClass are the actual arguments
     InternalClass *internalClass;
     uint nFormals;
     bool hasQmlDependencies;
-    bool canUseSimpleCall;
 
-    Function(ExecutionEngine *engine, CompiledData::CompilationUnit *unit, const CompiledData::Function *function,
-             ReturnedValue (*codePtr)(ExecutionEngine *, const uchar *));
+    Function(ExecutionEngine *engine, CompiledData::CompilationUnit *unit, const CompiledData::Function *function, Code codePtr);
     ~Function();
 
     // used when dynamically assigning signal handlers (QQmlConnection)
@@ -86,24 +98,13 @@ struct Q_QML_EXPORT Function {
 
     inline bool usesArgumentsObject() const { return compiledFunction->flags & CompiledData::Function::UsesArgumentsObject; }
     inline bool isStrict() const { return compiledFunction->flags & CompiledData::Function::IsStrict; }
-    inline bool isNamedExpression() const { return compiledFunction->flags & CompiledData::Function::IsNamedExpression; }
-
-    inline bool canUseSimpleFunction() const { return canUseSimpleCall; }
 
     QQmlSourceLocation sourceLocation() const
     {
         return QQmlSourceLocation(sourceFile(), compiledFunction->location.line, compiledFunction->location.column);
     }
-
 };
 
-
-inline unsigned int Heap::SimpleCallContext::formalParameterCount() const
-{
-    return v4Function ? v4Function->nFormals : 0;
-}
-
-
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/jsruntime/qv4functionobject.cpp b/src/qml/jsruntime/qv4functionobject.cpp
index 45fdde98f7..4293d43791 100644
--- a/src/qml/jsruntime/qv4functionobject.cpp
+++ b/src/qml/jsruntime/qv4functionobject.cpp
@@ -38,8 +38,6 @@
 ****************************************************************************/
 
 #include "qv4object_p.h"
-#include "qv4jsir_p.h"
-#include "qv4isel_p.h"
 #include "qv4objectproto_p.h"
 #include "qv4stringobject_p.h"
 #include "qv4function_p.h"
@@ -55,9 +53,10 @@
 #include <private/qqmljsast_p.h>
 #include <private/qqmljavascriptexpression_p.h>
 #include <private/qqmlengine_p.h>
-#include <qv4codegen_p.h>
+#include <qv4runtimecodegen_p.h>
 #include "private/qlocale_tools_p.h"
 #include "private/qqmlbuiltinfunctions_p.h"
+#include <private/qv4jscall_p.h>
 
 #include <QtCore/QDebug>
 #include <algorithm>
@@ -69,10 +68,25 @@ using namespace QV4;
 
 DEFINE_OBJECT_VTABLE(FunctionObject);
 
-Q_STATIC_ASSERT((Heap::FunctionObject::markTable & Heap::Object::markTable) == Heap::Object::markTable);
+void Heap::FunctionObject::init(QV4::ExecutionContext *scope, QV4::String *name,
+                                ReturnedValue (*code)(const QV4::FunctionObject *, const Value *thisObject, const Value *argv, int argc))
+{
+    jsCall = code;
+    jsConstruct = QV4::FunctionObject::callAsConstructor;
+
+    Object::init();
+    function = nullptr;
+    this->scope.set(scope->engine(), scope->d());
+    Scope s(scope->engine());
+    ScopedFunctionObject f(s, this);
+    f->init(name, false);
+}
 
 void Heap::FunctionObject::init(QV4::ExecutionContext *scope, QV4::String *name, bool createProto)
 {
+    jsCall = reinterpret_cast<const ObjectVTable *>(vtable())->call;
+    jsConstruct = reinterpret_cast<const ObjectVTable *>(vtable())->callAsConstructor;
+
     Object::init();
     function = nullptr;
     this->scope.set(scope->engine(), scope->d());
@@ -83,6 +97,9 @@ void Heap::FunctionObject::init(QV4::ExecutionContext *scope, QV4::String *name,
 
 void Heap::FunctionObject::init(QV4::ExecutionContext *scope, Function *function, bool createProto)
 {
+    jsCall = reinterpret_cast<const ObjectVTable *>(vtable())->call;
+    jsConstruct = reinterpret_cast<const ObjectVTable *>(vtable())->callAsConstructor;
+
     Object::init();
     this->function = function;
     function->compilationUnit->addref();
@@ -102,6 +119,9 @@ void Heap::FunctionObject::init(QV4::ExecutionContext *scope, const QString &nam
 
 void Heap::FunctionObject::init()
 {
+    jsCall = reinterpret_cast<const ObjectVTable *>(vtable())->call;
+    jsConstruct = reinterpret_cast<const ObjectVTable *>(vtable())->callAsConstructor;
+
     Object::init();
     function = nullptr;
     this->scope.set(internalClass->engine, internalClass->engine->rootContext()->d());
@@ -141,14 +161,14 @@ ReturnedValue FunctionObject::name() const
     return get(scope()->internalClass->engine->id_name());
 }
 
-void FunctionObject::construct(const Managed *that, Scope &scope, CallData *)
+ReturnedValue FunctionObject::callAsConstructor(const FunctionObject *f, const Value *, int)
 {
-    scope.result = static_cast<const FunctionObject *>(that)->engine()->throwTypeError();
+    return f->engine()->throwTypeError();
 }
 
-void FunctionObject::call(const Managed *, Scope &scope, CallData *)
+ReturnedValue FunctionObject::call(const FunctionObject *, const Value *, const Value *, int)
 {
-    scope.result = Encode::undefined();
+    return Encode::undefined();
 }
 
 Heap::FunctionObject *FunctionObject::createScriptFunction(ExecutionContext *scope, Function *function)
@@ -179,24 +199,22 @@ void Heap::FunctionCtor::init(QV4::ExecutionContext *scope)
 }
 
 // 15.3.2
-void FunctionCtor::construct(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue FunctionCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    Scoped<FunctionCtor> f(scope, static_cast<const FunctionCtor *>(that));
+    Scope scope(f->engine());
 
     QString arguments;
     QString body;
-    if (callData->argc > 0) {
-        for (int i = 0; i < callData->argc - 1; ++i) {
+    if (argc > 0) {
+        for (int i = 0, ei = argc - 1; i < ei; ++i) {
             if (i)
                 arguments += QLatin1String(", ");
-            arguments += callData->args[i].toQString();
+            arguments += argv[i].toQString();
         }
-        body = callData->args[callData->argc - 1].toQString();
-    }
-    if (scope.engine->hasException) {
-        scope.result = Encode::undefined();
-        return;
+        body = argv[argc - 1].toQString();
     }
+    if (scope.engine->hasException)
+        return Encode::undefined();
 
     QString function = QLatin1String("function(") + arguments + QLatin1String("){") + body + QLatin1Char('}');
 
@@ -207,36 +225,30 @@ void FunctionCtor::construct(const Managed *that, Scope &scope, CallData *callDa
 
     const bool parsed = parser.parseExpression();
 
-    if (!parsed) {
-        scope.result = scope.engine->throwSyntaxError(QLatin1String("Parse error"));
-        return;
-    }
+    if (!parsed)
+        return scope.engine->throwSyntaxError(QLatin1String("Parse error"));
 
-    using namespace QQmlJS::AST;
-    FunctionExpression *fe = QQmlJS::AST::cast<FunctionExpression *>(parser.rootNode());
-    if (!fe) {
-        scope.result = scope.engine->throwSyntaxError(QLatin1String("Parse error"));
-        return;
-    }
+    QQmlJS::AST::FunctionExpression *fe = QQmlJS::AST::cast<QQmlJS::AST::FunctionExpression *>(parser.rootNode());
+    if (!fe)
+        return scope.engine->throwSyntaxError(QLatin1String("Parse error"));
 
-    IR::Module module(scope.engine->debugger() != 0);
+    Compiler::Module module(scope.engine->debugger() != 0);
 
-    QQmlJS::RuntimeCodegen cg(scope.engine, f->strictMode());
+    Compiler::JSUnitGenerator jsGenerator(&module);
+    RuntimeCodegen cg(scope.engine, &jsGenerator, false);
     cg.generateFromFunctionExpression(QString(), function, fe, &module);
 
-    Compiler::JSUnitGenerator jsGenerator(&module);
-    QScopedPointer<EvalInstructionSelection> isel(scope.engine->iselFactory->create(QQmlEnginePrivate::get(scope.engine), scope.engine->executableAllocator, &module, &jsGenerator));
-    QQmlRefPointer<CompiledData::CompilationUnit> compilationUnit = isel->compile();
+    QQmlRefPointer<CompiledData::CompilationUnit> compilationUnit = cg.generateCompilationUnit();
     Function *vmf = compilationUnit->linkToEngine(scope.engine);
 
     ExecutionContext *global = scope.engine->rootContext();
-    scope.result = FunctionObject::createScriptFunction(global, vmf);
+    return Encode(FunctionObject::createScriptFunction(global, vmf));
 }
 
 // 15.3.1: This is equivalent to new Function(...)
-void FunctionCtor::call(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue FunctionCtor::call(const FunctionObject *f, const Value *, const Value *argv, int argc)
 {
-    construct(that, scope, callData);
+    return callAsConstructor(f, argv, argc);
 }
 
 DEFINE_OBJECT_VTABLE(FunctionPrototype);
@@ -263,152 +275,117 @@ void FunctionPrototype::init(ExecutionEngine *engine, Object *ctor)
 
 }
 
-void FunctionPrototype::method_toString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue FunctionPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    FunctionObject *fun = callData->thisObject.as<FunctionObject>();
+    ExecutionEngine *v4 = b->engine();
+    const FunctionObject *fun = thisObject->as<FunctionObject>();
     if (!fun)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
-    scope.result = scope.engine->newString(QStringLiteral("function() { [code] }"));
+    return Encode(v4->newString(QStringLiteral("function() { [code] }")));
 }
 
-void FunctionPrototype::method_apply(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue FunctionPrototype::method_apply(const QV4::FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    FunctionObject *o = callData->thisObject.as<FunctionObject>();
-    if (!o)
-        THROW_TYPE_ERROR();
+    ExecutionEngine *v4 = b->engine();
+    const FunctionObject *f = thisObject->as<FunctionObject>();
+    if (!f)
+        return v4->throwTypeError();
+    thisObject = argc ? argv : nullptr;
+    if (argc < 2 || argv[1].isNullOrUndefined())
+        return f->call(thisObject, argv, 0);
 
-    ScopedValue arg(scope, callData->argument(1));
+    Object *arr = argv[1].objectValue();
+    if (!arr)
+        return v4->throwTypeError();
 
-    ScopedObject arr(scope, arg);
-
-    quint32 len;
-    if (!arr) {
-        len = 0;
-        if (!arg->isNullOrUndefined())
-            THROW_TYPE_ERROR();
-    } else {
-        len = arr->getLength();
-    }
-
-    ScopedCallData cData(scope, len);
+    uint len = arr->getLength();
 
+    Scope scope(v4);
+    Value *arguments = v4->jsAlloca(len);
     if (len) {
         if (ArgumentsObject::isNonStrictArgumentsObject(arr) && !arr->cast<ArgumentsObject>()->fullyCreated()) {
             QV4::ArgumentsObject *a = arr->cast<ArgumentsObject>();
-            int l = qMin(len, (uint)a->d()->context->callData->argc);
-            memcpy(cData->args, a->d()->context->callData->args, l*sizeof(Value));
+            int l = qMin(len, (uint)a->d()->context->argc());
+            memcpy(arguments, a->d()->context->args(), l*sizeof(Value));
             for (quint32 i = l; i < len; ++i)
-                cData->args[i] = Primitive::undefinedValue();
+                arguments[i] = Primitive::undefinedValue();
         } else if (arr->arrayType() == Heap::ArrayData::Simple && !arr->protoHasArray()) {
             auto sad = static_cast<Heap::SimpleArrayData *>(arr->arrayData());
             uint alen = sad ? sad->values.size : 0;
             if (alen > len)
                 alen = len;
             for (uint i = 0; i < alen; ++i)
-                cData->args[i] = sad->data(i);
+                arguments[i] = sad->data(i);
             for (quint32 i = alen; i < len; ++i)
-                cData->args[i] = Primitive::undefinedValue();
+                arguments[i] = Primitive::undefinedValue();
         } else {
             for (quint32 i = 0; i < len; ++i)
-                cData->args[i] = arr->getIndexed(i);
+                arguments[i] = arr->getIndexed(i);
         }
     }
 
-    cData->thisObject = callData->argument(0);
-    o->call(scope, cData);
+    return f->call(thisObject, arguments, len);
 }
 
-void FunctionPrototype::method_call(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue FunctionPrototype::method_call(const QV4::FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    FunctionObject *o = callData->thisObject.as<FunctionObject>();
-    if (!o)
-        THROW_TYPE_ERROR();
+    if (!thisObject->isFunctionObject())
+        return b->engine()->throwTypeError();
 
-    ScopedCallData cData(scope, callData->argc ? callData->argc - 1 : 0);
-    if (callData->argc) {
-        for (int i = 1; i < callData->argc; ++i)
-            cData->args[i - 1] = callData->args[i];
-    }
-    cData->thisObject = callData->argument(0);
+    const FunctionObject *f = static_cast<const FunctionObject *>(thisObject);
 
-    o->call(scope, cData);
+    thisObject = argc ? argv : nullptr;
+    if (argc) {
+        ++argv;
+        --argc;
+    }
+    return f->call(thisObject, argv, argc);
 }
 
-void FunctionPrototype::method_bind(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue FunctionPrototype::method_bind(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    FunctionObject *target = callData->thisObject.as<FunctionObject>();
+    QV4::Scope scope(b);
+    ScopedFunctionObject target(scope, thisObject);
     if (!target)
-        THROW_TYPE_ERROR();
+        return scope.engine->throwTypeError();
 
-    ScopedValue boundThis(scope, callData->argument(0));
+    ScopedValue boundThis(scope, argc ? argv[0] : Primitive::undefinedValue());
     Scoped<MemberData> boundArgs(scope, (Heap::MemberData *)0);
-    if (callData->argc > 1) {
-        boundArgs = MemberData::allocate(scope.engine, callData->argc - 1);
-        boundArgs->d()->values.size = callData->argc - 1;
-        for (uint i = 0; i < static_cast<uint>(callData->argc - 1); ++i)
-            boundArgs->set(scope.engine, i, callData->args[i + 1]);
+    if (argc > 1) {
+        boundArgs = MemberData::allocate(scope.engine, argc - 1);
+        boundArgs->d()->values.size = argc - 1;
+        for (uint i = 0, ei = static_cast<uint>(argc - 1); i < ei; ++i)
+            boundArgs->set(scope.engine, i, argv[i + 1]);
     }
 
     ExecutionContext *global = scope.engine->rootContext();
-    scope.result = BoundFunction::create(global, target, boundThis, boundArgs);
+    return BoundFunction::create(global, target, boundThis, boundArgs)->asReturnedValue();
 }
 
 DEFINE_OBJECT_VTABLE(ScriptFunction);
 
-void ScriptFunction::construct(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue ScriptFunction::callAsConstructor(const FunctionObject *fo, const Value *argv, int argc)
 {
-    ExecutionEngine *v4 = scope.engine;
-    if (Q_UNLIKELY(v4->hasException)) {
-        scope.result = Encode::undefined();
-        return;
-    }
-    CHECK_STACK_LIMITS(v4, scope);
+    ExecutionEngine *v4 = fo->engine();
+    const ScriptFunction *f = static_cast<const ScriptFunction *>(fo);
 
-    ExecutionContextSaver ctxSaver(scope);
+    Scope scope(v4);
+    InternalClass *ic = f->classForConstructor();
+    ScopedValue thisObject(scope, v4->memoryManager->allocObject<Object>(ic));
 
-    Scoped<ScriptFunction> f(scope, static_cast<const ScriptFunction *>(that));
+    ReturnedValue result = Moth::VME::exec(fo, thisObject, argv, argc);
 
-    InternalClass *ic = f->classForConstructor();
-    ScopedObject proto(scope, ic->prototype);
-    ScopedObject obj(scope, v4->newObject(ic, proto));
-    callData->thisObject = obj.asReturnedValue();
-
-    QV4::Function *v4Function = f->function();
-    Q_ASSERT(v4Function);
-
-    ScopedContext c(scope, f->scope());
-    if (v4Function->canUseSimpleCall)
-        c->simpleCall(scope, callData, v4Function);
-    else
-        c->call(scope, callData, v4Function, f);
-
-    if (Q_UNLIKELY(v4->hasException)) {
-        scope.result = Encode::undefined();
-    } else if (!scope.result.isObject()) {
-        scope.result = obj.asReturnedValue();
-    }
+    if (Q_UNLIKELY(v4->hasException))
+        return Encode::undefined();
+    else if (!Value::fromReturnedValue(result).isObject())
+        return thisObject->asReturnedValue();
+    return result;
 }
 
-void ScriptFunction::call(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue ScriptFunction::call(const FunctionObject *fo, const Value *thisObject, const Value *argv, int argc)
 {
-    ExecutionEngine *v4 = scope.engine;
-    if (Q_UNLIKELY(v4->hasException)) {
-        scope.result = Encode::undefined();
-        return;
-    }
-    CHECK_STACK_LIMITS(v4, scope);
-
-    Scoped<ScriptFunction> f(scope, static_cast<const ScriptFunction *>(that));
-
-    QV4::Function *v4Function = f->function();
-    Q_ASSERT(v4Function);
-
-    ScopedContext c(scope, f->scope());
-    if (v4Function->canUseSimpleCall)
-        c->simpleCall(scope, callData, v4Function);
-    else
-        c->call(scope, callData, v4Function, f);
+    return Moth::VME::exec(fo, thisObject, argv, argc);
 }
 
 void Heap::ScriptFunction::init(QV4::ExecutionContext *scope, Function *function)
@@ -429,7 +406,7 @@ void Heap::ScriptFunction::init(QV4::ExecutionContext *scope, Function *function
     Q_ASSERT(internalClass && internalClass->find(s.engine->id_length()) == Index_Length);
     setProperty(s.engine, Index_Length, Primitive::fromInt32(f->formalParameterCount()));
 
-    if (scope->d()->strictMode) {
+    if (function->isStrict()) {
         ScopedProperty pd(s);
         pd->value = s.engine->thrower();
         pd->set = s.engine->thrower();
@@ -455,49 +432,23 @@ InternalClass *ScriptFunction::classForConstructor() const
 
 DEFINE_OBJECT_VTABLE(BuiltinFunction);
 
-void Heap::BuiltinFunction::init(QV4::ExecutionContext *scope, QV4::String *name, void (*code)(const QV4::BuiltinFunction *, Scope &, CallData *))
+void Heap::BuiltinFunction::init(QV4::ExecutionContext *scope, QV4::String *name, ReturnedValue (*code)(const QV4::BuiltinFunction *, CallData *))
 {
     Heap::FunctionObject::init(scope, name);
     this->code = code;
 }
 
-void BuiltinFunction::construct(const Managed *f, Scope &scope, CallData *)
-{
-    scope.result = static_cast<const BuiltinFunction *>(f)->internalClass()->engine->throwTypeError();
-}
-
-void BuiltinFunction::call(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue BuiltinFunction::callAsConstructor(const QV4::FunctionObject *f, const Value *, int)
 {
-    const BuiltinFunction *f = static_cast<const BuiltinFunction *>(that);
-    ExecutionEngine *v4 = scope.engine;
-    if (v4->hasException) {
-        scope.result = Encode::undefined();
-        return;
-    }
-    f->d()->code(f, scope, callData);
+    return f->engine()->throwTypeError();
 }
 
-
-void IndexedBuiltinFunction::call(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue BuiltinFunction::call(const FunctionObject *fo, const Value *thisObject, const Value *argv, int argc)
 {
-    const IndexedBuiltinFunction *f = static_cast<const IndexedBuiltinFunction *>(that);
-    ExecutionEngine *v4 = scope.engine;
-    if (v4->hasException) {
-        scope.result = Encode::undefined();
-        return;
-    }
-    CHECK_STACK_LIMITS(v4, scope);
-
-    ExecutionContextSaver ctxSaver(scope);
-
-    SimpleCallContext::Data *ctx = v4->memoryManager->allocSimpleCallContext();
-    ctx->strictMode = f->scope()->strictMode; // ### needed? scope or parent context?
-    ctx->callData = callData;
-    v4->pushContext(ctx);
-    Q_ASSERT(v4->current == ctx);
-
-    scope.result = f->d()->code(static_cast<QV4::CallContext *>(v4->currentContext), f->d()->index);
-    v4->memoryManager->freeSimpleCallContext();
+    const BuiltinFunction *f = static_cast<const BuiltinFunction *>(fo);
+    Scope scope(f->engine());
+    JSCallData callData(scope, argc, argv, thisObject);
+    return f->d()->code(f, callData.callData());
 }
 
 DEFINE_OBJECT_VTABLE(IndexedBuiltinFunction);
@@ -530,43 +481,43 @@ void Heap::BoundFunction::init(QV4::ExecutionContext *scope, QV4::FunctionObject
     f->insertMember(s.engine->id_caller(), pd, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable);
 }
 
-void BoundFunction::call(const Managed *that, Scope &scope, CallData *dd)
+ReturnedValue BoundFunction::call(const FunctionObject *fo, const Value *, const Value *argv, int argc)
 {
-    const BoundFunction *f = static_cast<const BoundFunction *>(that);
-    if (scope.hasException()) {
-        scope.result = Encode::undefined();
-        return;
-    }
+    const BoundFunction *f = static_cast<const BoundFunction *>(fo);
+    Scope scope(f->engine());
+
+    if (scope.hasException())
+        return Encode::undefined();
 
     Scoped<MemberData> boundArgs(scope, f->boundArgs());
-    ScopedCallData callData(scope, (boundArgs ? boundArgs->size() : 0) + dd->argc);
-    callData->thisObject = f->boundThis();
-    Value *argp = callData->args;
+    ScopedFunctionObject target(scope, f->target());
+    JSCallData jsCallData(scope, (boundArgs ? boundArgs->size() : 0) + argc);
+    *jsCallData->thisObject = f->boundThis();
+    Value *argp = jsCallData->args;
     if (boundArgs) {
         memcpy(argp, boundArgs->data(), boundArgs->size()*sizeof(Value));
         argp += boundArgs->size();
     }
-    memcpy(argp, dd->args, dd->argc*sizeof(Value));
-    ScopedFunctionObject t(scope, f->target());
-    t->call(scope, callData);
+    memcpy(argp, argv, argc*sizeof(Value));
+    return target->call(jsCallData);
 }
 
-void BoundFunction::construct(const Managed *that, Scope &scope, CallData *dd)
+ReturnedValue BoundFunction::callAsConstructor(const FunctionObject *fo, const Value *argv, int argc)
 {
-    const BoundFunction *f = static_cast<const BoundFunction *>(that);
-    if (scope.hasException()) {
-        scope.result = Encode::undefined();
-        return;
-    }
+    const BoundFunction *f = static_cast<const BoundFunction *>(fo);
+    Scope scope(f->engine());
+
+    if (scope.hasException())
+        return Encode::undefined();
 
     Scoped<MemberData> boundArgs(scope, f->boundArgs());
-    ScopedCallData callData(scope, (boundArgs ? boundArgs->size() : 0) + dd->argc);
-    Value *argp = callData->args;
+    ScopedFunctionObject target(scope, f->target());
+    JSCallData jsCallData(scope, (boundArgs ? boundArgs->size() : 0) + argc);
+    Value *argp = jsCallData->args;
     if (boundArgs) {
         memcpy(argp, boundArgs->data(), boundArgs->size()*sizeof(Value));
         argp += boundArgs->size();
     }
-    memcpy(argp, dd->args, dd->argc*sizeof(Value));
-    ScopedFunctionObject t(scope, f->target());
-    t->construct(scope, callData);
+    memcpy(argp, argv, argc*sizeof(Value));
+    return target->callAsConstructor(jsCallData);
 }
diff --git a/src/qml/jsruntime/qv4functionobject_p.h b/src/qml/jsruntime/qv4functionobject_p.h
index 6ce5734b6d..d61006a6b0 100644
--- a/src/qml/jsruntime/qv4functionobject_p.h
+++ b/src/qml/jsruntime/qv4functionobject_p.h
@@ -62,20 +62,29 @@ struct QQmlSourceLocation;
 namespace QV4 {
 
 struct BuiltinFunction;
+struct IndexedBuiltinFunction;
+struct JSCallData;
+
+typedef ReturnedValue (*jsCallFunction)(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+typedef ReturnedValue (*jsConstructFunction)(const FunctionObject *, const Value *argv, int argc);
 
 namespace Heap {
 
+
 #define FunctionObjectMembers(class, Member) \
     Member(class, Pointer, ExecutionContext *, scope) \
-    Member(class, NoMark, Function *, function)
+    Member(class, NoMark, Function *, function) \
+    Member(class, NoMark, jsCallFunction, jsCall) \
+    Member(class, NoMark, jsConstructFunction, jsConstruct)
 
 DECLARE_HEAP_OBJECT(FunctionObject, Object) {
-    DECLARE_MARK_TABLE(FunctionObject);
+    DECLARE_MARKOBJECTS(FunctionObject);
     enum {
         Index_Prototype = 0,
         Index_ProtoConstructor = 0
     };
 
+    void init(QV4::ExecutionContext *scope, QV4::String *name, ReturnedValue (*code)(const QV4::FunctionObject *, const Value *thisObject, const Value *argv, int argc));
     void init(QV4::ExecutionContext *scope, QV4::String *name = 0, bool createProto = false);
     void init(QV4::ExecutionContext *scope, QV4::Function *function, bool createProto = false);
     void init(QV4::ExecutionContext *scope, const QString &name, bool createProto = false);
@@ -96,19 +105,13 @@ struct FunctionPrototype : FunctionObject {
     void init();
 };
 
-struct Q_QML_EXPORT OldBuiltinFunction : FunctionObject {
-    void init(QV4::ExecutionContext *scope, QV4::String *name, ReturnedValue (*code)(QV4::CallContext *));
-    ReturnedValue (*code)(QV4::CallContext *);
-};
-
 struct Q_QML_EXPORT BuiltinFunction : FunctionObject {
-    void init(QV4::ExecutionContext *scope, QV4::String *name, void (*code)(const QV4::BuiltinFunction *, Scope &, CallData *));
-    void (*code)(const QV4::BuiltinFunction *, Scope &, CallData *);
+    void init(QV4::ExecutionContext *scope, QV4::String *name, ReturnedValue (*code)(const QV4::BuiltinFunction *, CallData *));
+    ReturnedValue (*code)(const QV4::BuiltinFunction *, CallData *);
 };
 
-struct IndexedBuiltinFunction : FunctionObject {
-    inline void init(QV4::ExecutionContext *scope, uint index, ReturnedValue (*code)(QV4::CallContext *ctx, uint index));
-    ReturnedValue (*code)(QV4::CallContext *, uint index);
+struct IndexedBuiltinFunction : BuiltinFunction {
+    inline void init(QV4::ExecutionContext *scope, uint index, ReturnedValue (*code)(const QV4::BuiltinFunction *, CallData *));
     uint index;
 };
 
@@ -128,7 +131,7 @@ struct ScriptFunction : FunctionObject {
     Member(class, Pointer, MemberData *, boundArgs)
 
 DECLARE_HEAP_OBJECT(BoundFunction, FunctionObject) {
-    DECLARE_MARK_TABLE(BoundFunction);
+    DECLARE_MARKOBJECTS(BoundFunction);
 
     void init(QV4::ExecutionContext *scope, QV4::FunctionObject *target, const Value &boundThis, QV4::MemberData *boundArgs);
 };
@@ -144,6 +147,7 @@ struct Q_QML_EXPORT FunctionObject: Object {
     V4_INTERNALCLASS(FunctionObject)
     V4_PROTOTYPE(functionPrototype)
     V4_NEEDS_DESTROY
+    enum { NInlineProperties = 1 };
 
     Heap::ExecutionContext *scope() const { return d()->scope; }
     Function *function() const { return d()->function; }
@@ -154,10 +158,16 @@ struct Q_QML_EXPORT FunctionObject: Object {
 
     void init(String *name, bool createProto);
 
-    using Object::construct;
-    using Object::call;
-    static void construct(const Managed *that, Scope &scope, CallData *);
-    static void call(const Managed *that, Scope &scope, CallData *d);
+    inline ReturnedValue callAsConstructor(const JSCallData &data) const;
+    ReturnedValue callAsConstructor(const Value *argv, int argc) const {
+        return d()->jsConstruct(this, argv, argc);
+    }
+    inline ReturnedValue call(const JSCallData &data) const;
+    ReturnedValue call(const Value *thisObject, const Value *argv, int argc) const {
+        return d()->jsCall(this, thisObject, argv, argc);
+    }
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 
     static Heap::FunctionObject *createScriptFunction(ExecutionContext *scope, Function *function);
 
@@ -178,8 +188,8 @@ struct FunctionCtor: FunctionObject
 {
     V4_OBJECT2(FunctionCtor, FunctionObject)
 
-    static void construct(const Managed *that, Scope &scope, CallData *callData);
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct FunctionPrototype: FunctionObject
@@ -188,52 +198,51 @@ struct FunctionPrototype: FunctionObject
 
     void init(ExecutionEngine *engine, Object *ctor);
 
-    static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_apply(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_call(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_bind(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_apply(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_call(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_bind(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct Q_QML_EXPORT BuiltinFunction : FunctionObject {
     V4_OBJECT2(BuiltinFunction, FunctionObject)
     V4_INTERNALCLASS(BuiltinFunction)
 
-    static Heap::BuiltinFunction *create(ExecutionContext *scope, String *name, void (*code)(const BuiltinFunction *, Scope &, CallData *))
+    static Heap::BuiltinFunction *create(ExecutionContext *scope, String *name, ReturnedValue (*code)(const BuiltinFunction *, CallData *))
     {
         return scope->engine()->memoryManager->allocObject<BuiltinFunction>(scope, name, code);
     }
 
-    static void construct(const Managed *, Scope &scope, CallData *);
-    static void call(const Managed *that, Scope &scope, CallData *callData);
-};
-
-struct IndexedBuiltinFunction: FunctionObject
-{
-    V4_OBJECT2(IndexedBuiltinFunction, FunctionObject)
-
-    static void construct(const Managed *m, Scope &scope, CallData *)
+    static Heap::FunctionObject *create(ExecutionContext *scope, String *name, ReturnedValue (*code)(const FunctionObject *, const Value *thisObject, const Value *argv, int argc))
     {
-        scope.result = static_cast<const IndexedBuiltinFunction *>(m)->engine()->throwTypeError();
+        return scope->engine()->memoryManager->allocObject<FunctionObject>(scope, name, code);
     }
 
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
+};
+
+struct IndexedBuiltinFunction: BuiltinFunction
+{
+    V4_OBJECT2(IndexedBuiltinFunction, BuiltinFunction)
 };
 
 void Heap::IndexedBuiltinFunction::init(QV4::ExecutionContext *scope, uint index,
-                                        ReturnedValue (*code)(QV4::CallContext *ctx, uint index))
+                                        ReturnedValue (*code)(const QV4::BuiltinFunction *, CallData *))
 {
     Heap::FunctionObject::init(scope);
-    this->index = index;
     this->code = code;
+    this->index = index;
 }
 
 
 struct ScriptFunction : FunctionObject {
     V4_OBJECT2(ScriptFunction, FunctionObject)
     V4_INTERNALCLASS(ScriptFunction)
+    enum { NInlineProperties = 3 };
 
-    static void construct(const Managed *, Scope &scope, CallData *callData);
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 
     InternalClass *classForConstructor() const;
 };
@@ -251,8 +260,8 @@ struct BoundFunction: FunctionObject {
     Value boundThis() const { return d()->boundThis; }
     Heap::MemberData *boundArgs() const { return d()->boundArgs; }
 
-    static void construct(const Managed *, Scope &scope, CallData *d);
-    static void call(const Managed *that, Scope &scope, CallData *dd);
+    static ReturnedValue callAsConstructor(const FunctionObject *, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 };
 
 }
diff --git a/src/qml/jsruntime/qv4global_p.h b/src/qml/jsruntime/qv4global_p.h
index 8769519a59..090a164ef6 100644
--- a/src/qml/jsruntime/qv4global_p.h
+++ b/src/qml/jsruntime/qv4global_p.h
@@ -107,8 +107,8 @@ inline double trunc(double d) { return d > 0 ? floor(d) : ceil(d); }
 #  if defined(Q_OS_LINUX)
 #    define V4_ENABLE_JIT
 #  endif
-#elif defined(Q_PROCESSOR_MIPS_32) && defined(Q_OS_LINUX)
-#  define V4_ENABLE_JIT
+//#elif defined(Q_PROCESSOR_MIPS_32) && defined(Q_OS_LINUX)
+//#  define V4_ENABLE_JIT
 #endif
 
 // Black list some platforms
@@ -147,6 +147,12 @@ QT_BEGIN_NAMESPACE
 
 namespace QV4 {
 
+namespace Compiler {
+    struct Module;
+    struct Context;
+    struct JSUnitGenerator;
+}
+
 namespace Heap {
     struct Base;
     struct MemberData;
@@ -157,7 +163,6 @@ namespace Heap {
     struct ObjectPrototype;
 
     struct ExecutionContext;
-    struct GlobalContext;
     struct CallContext;
     struct ScriptFunction;
 
@@ -182,12 +187,12 @@ namespace Heap {
 }
 
 class MemoryManager;
+class ExecutableAllocator;
 struct String;
 struct Object;
 struct ObjectPrototype;
 struct ObjectIterator;
 struct ExecutionContext;
-struct GlobalContext;
 struct CallContext;
 struct ScriptFunction;
 struct InternalClass;
@@ -243,12 +248,6 @@ struct IdentifierTable;
 class RegExpCache;
 class MultiplyWrappedQObjectMap;
 
-namespace Global {
-    enum {
-        ReservedArgumentCount = 6
-    };
-}
-
 enum PropertyFlag {
     Attr_Data = 0,
     Attr_Accessor = 0x1,
@@ -349,11 +348,11 @@ struct PropertyAttributes
     }
 };
 
-struct StackFrame {
+struct Q_QML_EXPORT StackFrame {
     QString source;
     QString function;
-    int line;
-    int column;
+    int line = -1;
+    int column = -1;
 };
 typedef QVector<StackFrame> StackTrace;
 
diff --git a/src/qml/jsruntime/qv4globalobject.cpp b/src/qml/jsruntime/qv4globalobject.cpp
index 0916e8e110..3214a716e8 100644
--- a/src/qml/jsruntime/qv4globalobject.cpp
+++ b/src/qml/jsruntime/qv4globalobject.cpp
@@ -47,12 +47,12 @@
 #include "qv4script_p.h"
 #include "qv4scopedvalue_p.h"
 #include "qv4string_p.h"
+#include "qv4jscall_p.h"
 
 #include <private/qqmljsengine_p.h>
 #include <private/qqmljslexer_p.h>
 #include <private/qqmljsparser_p.h>
 #include <private/qqmljsast_p.h>
-#include <qv4jsir_p.h>
 #include <qv4codegen_p.h>
 #include "private/qlocale_tools_p.h"
 #include "private/qtools_p.h"
@@ -338,72 +338,56 @@ void Heap::EvalFunction::init(QV4::ExecutionContext *scope)
     f->defineReadonlyProperty(s.engine->id_length(), Primitive::fromInt32(1));
 }
 
-void EvalFunction::evalCall(Scope &scope, CallData *callData, bool directCall) const
+ReturnedValue EvalFunction::evalCall(const Value *, const Value *argv, int argc, bool directCall) const
 {
-    if (callData->argc < 1) {
-        scope.result = Encode::undefined();
-        return;
-    }
+    if (argc < 1)
+        return Encode::undefined();
 
     ExecutionEngine *v4 = engine();
-    ExecutionContextSaver ctxSaver(scope);
+    bool isStrict = v4->currentStackFrame->v4Function->isStrict();
 
-    ExecutionContext *currentContext = v4->currentContext;
-    ExecutionContext *ctx = currentContext;
+    Scope scope(v4);
+    ScopedContext ctx(scope, v4->currentContext());
 
     if (!directCall) {
-        // the context for eval should be the global scope, so we fake a root
-        // context
-        ctx = v4->pushGlobalContext();
+        // the context for eval should be the global scope
+        ctx = v4->rootContext();
     }
 
-    String *scode = callData->args[0].stringValue();
-    if (!scode) {
-        scope.result = callData->args[0].asReturnedValue();
-        return;
-    }
+    String *scode = argv[0].stringValue();
+    if (!scode)
+        return argv[0].asReturnedValue();
 
     const QString code = scode->toQString();
-    bool inheritContext = !ctx->d()->strictMode;
+    bool inheritContext = !isStrict;
 
-    Script script(ctx, code, QStringLiteral("eval code"));
-    script.strictMode = (directCall && currentContext->d()->strictMode);
+    Script script(ctx, QV4::Compiler::EvalCode, code, QStringLiteral("eval code"));
+    script.strictMode = (directCall && isStrict);
     script.inheritContext = inheritContext;
     script.parse();
-    if (v4->hasException) {
-        scope.result = Encode::undefined();
-        return;
-    }
+    if (v4->hasException)
+        return Encode::undefined();
 
     Function *function = script.function();
-    if (!function) {
-        scope.result = Encode::undefined();
-        return;
-    }
+    if (!function)
+        return Encode::undefined();
 
-    if (function->isStrict() || (ctx->d()->strictMode)) {
+    if (function->isStrict() || isStrict) {
         ScopedFunctionObject e(scope, FunctionObject::createScriptFunction(ctx, function));
-        ScopedCallData callData(scope, 0);
-        callData->thisObject = ctx->thisObject();
-        e->call(scope, callData);
-        return;
+        ScopedValue thisObject(scope, directCall ? scope.engine->currentStackFrame->thisObject() : scope.engine->globalObject->asReturnedValue());
+        return e->call(thisObject, 0, 0);
     }
 
-    ContextStateSaver stateSaver(scope, ctx);
-
-    // set the correct strict mode flag on the context
-    ctx->d()->strictMode = false;
-    ctx->d()->compilationUnit = function->compilationUnit;
-    ctx->d()->constantTable = function->compilationUnit->constants;
+    ScopedValue thisObject(scope, scope.engine->currentStackFrame->thisObject());
 
-    scope.result = Q_V4_PROFILE(ctx->engine(), function);
+    return function->call(thisObject, 0, 0, ctx);
 }
 
 
-void EvalFunction::call(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue EvalFunction::call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc)
 {
     // indirect call
-    static_cast<const EvalFunction *>(that)->evalCall(scope, callData, false);
+    return static_cast<const EvalFunction *>(f)->evalCall(thisObject, argv, argc, false);
 }
 
 
@@ -424,10 +408,11 @@ static inline int toInt(const QChar &qc, int R)
 }
 
 // parseInt [15.1.2.2]
-void GlobalFunctions::method_parseInt(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalFunctions::method_parseInt(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedValue inputString(scope, callData->argument(0));
-    ScopedValue radix(scope, callData->argument(1));
+    Scope scope(b);
+    ScopedValue inputString(scope, argc ? argv[0] : Primitive::undefinedValue());
+    ScopedValue radix(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
     int R = radix->isUndefined() ? 0 : radix->toInt32();
 
     // [15.1.2.2] step by step:
@@ -504,10 +489,11 @@ void GlobalFunctions::method_parseInt(const BuiltinFunction *, Scope &scope, Cal
 }
 
 // parseFloat [15.1.2.3]
-void GlobalFunctions::method_parseFloat(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalFunctions::method_parseFloat(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
+    Scope scope(b);
     // [15.1.2.3] step by step:
-    ScopedString inputString(scope, callData->argument(0), ScopedString::Convert);
+    ScopedString inputString(scope, argc ? argv[0] : Primitive::undefinedValue(), ScopedString::Convert);
     CHECK_EXCEPTION();
 
     QString trimmed = inputString->toQString().trimmed(); // 2
@@ -530,115 +516,125 @@ void GlobalFunctions::method_parseFloat(const BuiltinFunction *, Scope &scope, C
 }
 
 /// isNaN [15.1.2.4]
-void GlobalFunctions::method_isNaN(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalFunctions::method_isNaN(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    if (!callData->argc)
+    if (!argc)
         // undefined gets converted to NaN
         RETURN_RESULT(Encode(true));
 
-    if (callData->args[0].integerCompatible())
+    if (argv[0].integerCompatible())
         RETURN_RESULT(Encode(false));
 
-    double d = callData->args[0].toNumber();
+    double d = argv[0].toNumber();
     RETURN_RESULT(Encode((bool)std::isnan(d)));
 }
 
 /// isFinite [15.1.2.5]
-void GlobalFunctions::method_isFinite(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalFunctions::method_isFinite(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    if (!callData->argc)
+    if (!argc)
         // undefined gets converted to NaN
         RETURN_RESULT(Encode(false));
 
-    if (callData->args[0].integerCompatible())
+    if (argv[0].integerCompatible())
         RETURN_RESULT(Encode(true));
 
-    double d = callData->args[0].toNumber();
+    double d = argv[0].toNumber();
     RETURN_RESULT(Encode((bool)std::isfinite(d)));
 }
 
 /// decodeURI [15.1.3.1]
-void GlobalFunctions::method_decodeURI(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalFunctions::method_decodeURI(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    if (callData->argc == 0)
+    if (argc == 0)
         RETURN_UNDEFINED();
 
-    QString uriString = callData->args[0].toQString();
+    ExecutionEngine *v4 = b->engine();
+    QString uriString = argv[0].toQString();
     bool ok;
     QString out = decode(uriString, DecodeNonReserved, &ok);
     if (!ok) {
+        Scope scope(v4);
         ScopedString s(scope, scope.engine->newString(QStringLiteral("malformed URI sequence")));
         RETURN_RESULT(scope.engine->throwURIError(s));
     }
 
-    RETURN_RESULT(scope.engine->newString(out));
+    RETURN_RESULT(v4->newString(out));
 }
 
 /// decodeURIComponent [15.1.3.2]
-void GlobalFunctions::method_decodeURIComponent(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalFunctions::method_decodeURIComponent(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    if (callData->argc == 0)
+    if (argc == 0)
         RETURN_UNDEFINED();
 
-    QString uriString = callData->args[0].toQString();
+    ExecutionEngine *v4 = b->engine();
+    QString uriString = argv[0].toQString();
     bool ok;
     QString out = decode(uriString, DecodeAll, &ok);
     if (!ok) {
+        Scope scope(v4);
         ScopedString s(scope, scope.engine->newString(QStringLiteral("malformed URI sequence")));
         RETURN_RESULT(scope.engine->throwURIError(s));
     }
 
-    RETURN_RESULT(scope.engine->newString(out));
+    RETURN_RESULT(v4->newString(out));
 }
 
 /// encodeURI [15.1.3.3]
-void GlobalFunctions::method_encodeURI(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalFunctions::method_encodeURI(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    if (callData->argc == 0)
+    if (argc == 0)
         RETURN_UNDEFINED();
 
-    QString uriString = callData->args[0].toQString();
+    ExecutionEngine *v4 = b->engine();
+    QString uriString = argv[0].toQString();
     bool ok;
     QString out = encode(uriString, uriUnescapedReserved, &ok);
     if (!ok) {
+        Scope scope(v4);
         ScopedString s(scope, scope.engine->newString(QStringLiteral("malformed URI sequence")));
         RETURN_RESULT(scope.engine->throwURIError(s));
     }
 
-    RETURN_RESULT(scope.engine->newString(out));
+    RETURN_RESULT(v4->newString(out));
 }
 
 /// encodeURIComponent [15.1.3.4]
-void GlobalFunctions::method_encodeURIComponent(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalFunctions::method_encodeURIComponent(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    if (callData->argc == 0)
+    if (argc == 0)
         RETURN_UNDEFINED();
 
-    QString uriString = callData->args[0].toQString();
+    ExecutionEngine *v4 = b->engine();
+    QString uriString = argv[0].toQString();
     bool ok;
     QString out = encode(uriString, uriUnescaped, &ok);
     if (!ok) {
+        Scope scope(v4);
         ScopedString s(scope, scope.engine->newString(QStringLiteral("malformed URI sequence")));
         RETURN_RESULT(scope.engine->throwURIError(s));
     }
 
-    RETURN_RESULT(scope.engine->newString(out));
+    RETURN_RESULT(v4->newString(out));
 }
 
-void GlobalFunctions::method_escape(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalFunctions::method_escape(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    if (!callData->argc)
-        RETURN_RESULT(scope.engine->newString(QStringLiteral("undefined")));
+    ExecutionEngine *v4 = b->engine();
+    if (!argc)
+        RETURN_RESULT(v4->newString(QStringLiteral("undefined")));
 
-    QString str = callData->args[0].toQString();
-    RETURN_RESULT(scope.engine->newString(escape(str)));
+    QString str = argv[0].toQString();
+    RETURN_RESULT(v4->newString(escape(str)));
 }
 
-void GlobalFunctions::method_unescape(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalFunctions::method_unescape(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    if (!callData->argc)
-        RETURN_RESULT(scope.engine->newString(QStringLiteral("undefined")));
+    ExecutionEngine *v4 = b->engine();
+    if (!argc)
+        RETURN_RESULT(v4->newString(QStringLiteral("undefined")));
 
-    QString str = callData->args[0].toQString();
-    RETURN_RESULT(scope.engine->newString(unescape(str)));
+    QString str = argv[0].toQString();
+    RETURN_RESULT(v4->newString(unescape(str)));
 }
diff --git a/src/qml/jsruntime/qv4globalobject_p.h b/src/qml/jsruntime/qv4globalobject_p.h
index 273f1ba7ea..fd1820c23c 100644
--- a/src/qml/jsruntime/qv4globalobject_p.h
+++ b/src/qml/jsruntime/qv4globalobject_p.h
@@ -69,23 +69,23 @@ struct Q_QML_EXPORT EvalFunction : FunctionObject
 {
     V4_OBJECT2(EvalFunction, FunctionObject)
 
-    void evalCall(Scope &scope, CallData *callData, bool directCall) const;
+    ReturnedValue evalCall(const Value *thisObject, const Value *argv, int argc, bool directCall) const;
 
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct GlobalFunctions
 {
-    static void method_parseInt(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_parseFloat(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_isNaN(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_isFinite(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_decodeURI(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_decodeURIComponent(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_encodeURI(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_encodeURIComponent(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_escape(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_unescape(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_parseInt(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_parseFloat(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_isNaN(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_isFinite(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_decodeURI(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_decodeURIComponent(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_encodeURI(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_encodeURIComponent(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_escape(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_unescape(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 }
diff --git a/src/qml/jsruntime/qv4include.cpp b/src/qml/jsruntime/qv4include.cpp
index 1edb7d3914..3e04ed63df 100644
--- a/src/qml/jsruntime/qv4include.cpp
+++ b/src/qml/jsruntime/qv4include.cpp
@@ -39,6 +39,7 @@
 
 #include "qv4include_p.h"
 #include "qv4scopedvalue_p.h"
+#include "qv4jscall_p.h"
 
 #include <QtQml/qjsengine.h>
 #if QT_CONFIG(qml_network)
@@ -118,10 +119,10 @@ void QV4Include::callback(const QV4::Value &callback, const QV4::Value &status)
     if (!f)
         return;
 
-    QV4::ScopedCallData callData(scope, 1);
-    callData->thisObject = v4->globalObject->asReturnedValue();
-    callData->args[0] = status;
-    f->call(scope, callData);
+    QV4::JSCallData jsCallData(scope, 1);
+    *jsCallData->thisObject = v4->globalObject->asReturnedValue();
+    jsCallData->args[0] = status;
+    f->call(jsCallData);
     if (scope.hasException())
         scope.engine->catchException();
 }
@@ -195,9 +196,10 @@ void QV4Include::finished()
 /*
     Documented in qv8engine.cpp
 */
-void QV4Include::method_include(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+QV4::ReturnedValue QV4Include::method_include(const QV4::BuiltinFunction *b, QV4::CallData *callData)
 {
-    if (!callData->argc)
+    QV4::Scope scope(b);
+    if (!callData->argc())
         RETURN_UNDEFINED();
 
     QQmlContextData *context = scope.engine->callingQmlContext();
@@ -206,7 +208,7 @@ void QV4Include::method_include(const QV4::BuiltinFunction *, QV4::Scope &scope,
         RETURN_RESULT(scope.engine->throwError(QString::fromUtf8("Qt.include(): Can only be called from JavaScript files")));
 
     QV4::ScopedValue callbackFunction(scope, QV4::Primitive::undefinedValue());
-    if (callData->argc >= 2 && callData->args[1].as<QV4::FunctionObject>())
+    if (callData->argc() >= 2 && callData->args[1].as<QV4::FunctionObject>())
         callbackFunction = callData->args[1];
 
 #if QT_CONFIG(qml_network)
@@ -260,13 +262,13 @@ void QV4Include::method_include(const QV4::BuiltinFunction *, QV4::Scope &scope,
         callback(callbackFunction, result);
     }
 
-    scope.result = result;
 #else
     QV4::ScopedValue result(scope);
     result = resultValue(scope.engine, NetworkError);
     callback(callbackFunction, result);
-    scope.result = result;
 #endif
+
+    return result->asReturnedValue();
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/jsruntime/qv4include_p.h b/src/qml/jsruntime/qv4include_p.h
index 5908d6bfde..68537ba2e8 100644
--- a/src/qml/jsruntime/qv4include_p.h
+++ b/src/qml/jsruntime/qv4include_p.h
@@ -77,7 +77,7 @@ public:
         Exception = 3
     };
 
-    static void method_include(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static QV4::ReturnedValue method_include(const QV4::BuiltinFunction *, QV4::CallData *callData);
 
 private Q_SLOTS:
     void finished();
diff --git a/src/qml/jsruntime/qv4jscall_p.h b/src/qml/jsruntime/qv4jscall_p.h
new file mode 100644
index 0000000000..6d641bf9c5
--- /dev/null
+++ b/src/qml/jsruntime/qv4jscall_p.h
@@ -0,0 +1,139 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QV4JSCALL_H
+#define QV4JSCALL_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qv4object_p.h"
+#include "qv4function_p.h"
+#include "qv4functionobject_p.h"
+#include "qv4context_p.h"
+#include "qv4scopedvalue_p.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+struct JSCallData {
+    JSCallData(const Scope &scope, int argc = 0, const Value *argv = 0, const Value *thisObject = 0)
+        : scope(scope), argc(argc)
+    {
+        if (thisObject)
+            this->thisObject = const_cast<Value *>(thisObject);
+        else
+            this->thisObject = scope.alloc(1);
+        if (argv)
+            this->args = const_cast<Value *>(argv);
+        else
+            this->args = scope.alloc(argc);
+    }
+
+    JSCallData *operator->() {
+        return this;
+    }
+
+    CallData *callData(const FunctionObject *f = nullptr) const {
+        int size = int(offsetof(QV4::CallData, args)/sizeof(QV4::Value)) + argc;
+        CallData *ptr = reinterpret_cast<CallData *>(scope.engine->jsStackTop);
+        scope.engine->jsStackTop += size;
+        ptr->function = Encode::undefined();
+        ptr->context = Encode::undefined();
+        ptr->accumulator = Encode::undefined();
+        ptr->thisObject = thisObject->asReturnedValue();
+        ptr->setArgc(argc);
+        if (argc)
+            memcpy(ptr->args, args, argc*sizeof(Value));
+        if (f)
+            ptr->function = f->asReturnedValue();
+        return ptr;
+    }
+    const Scope &scope;
+    int argc;
+    Value *args;
+    Value *thisObject;
+};
+
+inline
+ReturnedValue FunctionObject::callAsConstructor(const JSCallData &data) const
+{
+    return d()->jsConstruct(this, data.args, data.argc);
+}
+
+inline
+ReturnedValue FunctionObject::call(const JSCallData &data) const
+{
+    return d()->jsCall(this, data.thisObject, data.args, data.argc);
+}
+
+
+struct ScopedStackFrame {
+    Scope &scope;
+    CppStackFrame frame;
+
+    ScopedStackFrame(Scope &scope, Heap::ExecutionContext *context)
+        : scope(scope)
+    {
+        frame.parent = scope.engine->currentStackFrame;
+        if (!context)
+            return;
+        frame.jsFrame = reinterpret_cast<CallData *>(scope.alloc(sizeof(CallData)/sizeof(Value)));
+        frame.jsFrame->context = context;
+        frame.v4Function = frame.parent ? frame.parent->v4Function : 0;
+        scope.engine->currentStackFrame = &frame;
+    }
+    ~ScopedStackFrame() {
+        scope.engine->currentStackFrame = frame.parent;
+    }
+};
+
+}
+
+QT_END_NAMESPACE
+
+#endif // QV4JSCALL_H
diff --git a/src/qml/jsruntime/qv4jsonobject.cpp b/src/qml/jsruntime/qv4jsonobject.cpp
index 0f021c8bd0..5e580b8b4d 100644
--- a/src/qml/jsruntime/qv4jsonobject.cpp
+++ b/src/qml/jsruntime/qv4jsonobject.cpp
@@ -46,6 +46,7 @@
 #include <qv4runtime_p.h>
 #include <qv4variantobject_p.h>
 #include "qv4string_p.h"
+#include "qv4jscall_p.h"
 
 #include <qstack.h>
 #include <qstringlist.h>
@@ -689,57 +690,57 @@ static QString quote(const QString &str)
 QString Stringify::Str(const QString &key, const Value &v)
 {
     Scope scope(v4);
-    scope.result = v;
 
-    ScopedObject o(scope, scope.result);
+    ScopedValue value(scope, v);
+    ScopedObject o(scope, value);
     if (o) {
         ScopedString s(scope, v4->newString(QStringLiteral("toJSON")));
         ScopedFunctionObject toJSON(scope, o->get(s));
         if (!!toJSON) {
-            ScopedCallData callData(scope, 1);
-            callData->thisObject = scope.result;
-            callData->args[0] = v4->newString(key);
-            toJSON->call(scope, callData);
+            JSCallData jsCallData(scope, 1);
+            *jsCallData->thisObject = value;
+            jsCallData->args[0] = v4->newString(key);
+            value = toJSON->call(jsCallData);
         }
     }
 
     if (replacerFunction) {
         ScopedObject holder(scope, v4->newObject());
-        holder->put(scope.engine->id_empty(), scope.result);
-        ScopedCallData callData(scope, 2);
-        callData->args[0] = v4->newString(key);
-        callData->args[1] = scope.result;
-        callData->thisObject = holder;
-        replacerFunction->call(scope, callData);
+        holder->put(scope.engine->id_empty(), value);
+        JSCallData jsCallData(scope, 2);
+        jsCallData->args[0] = v4->newString(key);
+        jsCallData->args[1] = value;
+        *jsCallData->thisObject = holder;
+        value = replacerFunction->call(jsCallData);
     }
 
-    o = scope.result.asReturnedValue();
+    o = value->asReturnedValue();
     if (o) {
         if (NumberObject *n = o->as<NumberObject>())
-            scope.result = Encode(n->value());
+            value = Encode(n->value());
         else if (StringObject *so = o->as<StringObject>())
-            scope.result = so->d()->string;
+            value = so->d()->string;
         else if (BooleanObject *b = o->as<BooleanObject>())
-            scope.result = Encode(b->value());
+            value = Encode(b->value());
     }
 
-    if (scope.result.isNull())
+    if (value->isNull())
         return QStringLiteral("null");
-    if (scope.result.isBoolean())
-        return scope.result.booleanValue() ? QStringLiteral("true") : QStringLiteral("false");
-    if (String *s = scope.result.stringValue())
-        return quote(s->toQString());
-
-    if (scope.result.isNumber()) {
-        double d = scope.result.toNumber();
-        return std::isfinite(d) ? scope.result.toQString() : QStringLiteral("null");
+    if (value->isBoolean())
+        return value->booleanValue() ? QStringLiteral("true") : QStringLiteral("false");
+    if (value->isString())
+        return quote(value->stringValue()->toQString());
+
+    if (value->isNumber()) {
+        double d = value->toNumber();
+        return std::isfinite(d) ? value->toQString() : QStringLiteral("null");
     }
 
-    if (const QV4::VariantObject *v = scope.result.as<QV4::VariantObject>()) {
+    if (const QV4::VariantObject *v = value->as<QV4::VariantObject>()) {
         return v->d()->data().toString();
     }
 
-    o = scope.result.asReturnedValue();
+    o = value->asReturnedValue();
     if (o) {
         if (!o->as<FunctionObject>()) {
             if (o->as<ArrayObject>()) {
@@ -883,25 +884,28 @@ void Heap::JsonObject::init()
 }
 
 
-void JsonObject::method_parse(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue JsonObject::method_parse(const BuiltinFunction *b, CallData *callData)
 {
-    ScopedValue v(scope, callData->argument(0));
-    QString jtext = v->toQString();
+    ExecutionEngine *v4 = b->engine();
+    QString jtext;
+    if (callData->argc() > 0)
+        jtext = callData->args[0].toQString();
 
     DEBUG << "parsing source = " << jtext;
-    JsonParser parser(scope.engine, jtext.constData(), jtext.length());
+    JsonParser parser(v4, jtext.constData(), jtext.length());
     QJsonParseError error;
-    ScopedValue result(scope, parser.parse(&error));
+    ReturnedValue result = parser.parse(&error);
     if (error.error != QJsonParseError::NoError) {
         DEBUG << "parse error" << error.errorString();
-        RETURN_RESULT(scope.engine->throwSyntaxError(QStringLiteral("JSON.parse: Parse error")));
+        RETURN_RESULT(v4->throwSyntaxError(QStringLiteral("JSON.parse: Parse error")));
     }
 
-    scope.result = result;
+    return result;
 }
 
-void JsonObject::method_stringify(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue JsonObject::method_stringify(const BuiltinFunction *b, CallData *callData)
 {
+    Scope scope(b);
     Stringify stringify(scope.engine);
 
     ScopedObject o(scope, callData->argument(1));
@@ -946,7 +950,7 @@ void JsonObject::method_stringify(const BuiltinFunction *, Scope &scope, CallDat
     QString result = stringify.Str(QString(), arg0);
     if (result.isEmpty() || scope.engine->hasException)
         RETURN_UNDEFINED();
-    scope.result = scope.engine->newString(result);
+    return Encode(scope.engine->newString(result));
 }
 
 
diff --git a/src/qml/jsruntime/qv4jsonobject_p.h b/src/qml/jsruntime/qv4jsonobject_p.h
index a73ce1c74e..19dba14aef 100644
--- a/src/qml/jsruntime/qv4jsonobject_p.h
+++ b/src/qml/jsruntime/qv4jsonobject_p.h
@@ -88,8 +88,8 @@ private:
     typedef QSet<ObjectItem> V4ObjectSet;
 public:
 
-    static void method_parse(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_stringify(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_parse(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_stringify(const BuiltinFunction *, CallData *callData);
 
     static ReturnedValue fromJsonValue(ExecutionEngine *engine, const QJsonValue &value);
     static ReturnedValue fromJsonObject(ExecutionEngine *engine, const QJsonObject &object);
diff --git a/src/qml/jsruntime/qv4lookup.cpp b/src/qml/jsruntime/qv4lookup.cpp
index afadf59bd5..c603d424ed 100644
--- a/src/qml/jsruntime/qv4lookup.cpp
+++ b/src/qml/jsruntime/qv4lookup.cpp
@@ -38,7 +38,7 @@
 ****************************************************************************/
 #include "qv4lookup_p.h"
 #include "qv4functionobject_p.h"
-#include "qv4scopedvalue_p.h"
+#include "qv4jscall_p.h"
 #include "qv4string_p.h"
 #include <private/qv4identifiertable_p.h>
 
@@ -50,7 +50,7 @@ using namespace QV4;
 ReturnedValue Lookup::lookup(const Value &thisObject, Object *o, PropertyAttributes *attrs)
 {
     ExecutionEngine *engine = o->engine();
-    Identifier *name = engine->identifierTable->identifier(engine->current->compilationUnit->runtimeStrings[nameIndex]);
+    Identifier *name = engine->identifierTable->identifier(engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
     int i = 0;
     Heap::Object *obj = o->d();
     while (i < Size && obj) {
@@ -86,7 +86,7 @@ ReturnedValue Lookup::lookup(const Object *thisObject, PropertyAttributes *attrs
 {
     Heap::Object *obj = thisObject->d();
     ExecutionEngine *engine = thisObject->engine();
-    Identifier *name = engine->identifierTable->identifier(engine->current->compilationUnit->runtimeStrings[nameIndex]);
+    Identifier *name = engine->identifierTable->identifier(engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
     int i = 0;
     while (i < Size && obj) {
         classList[i] = obj->internalClass;
@@ -117,140 +117,6 @@ ReturnedValue Lookup::lookup(const Object *thisObject, PropertyAttributes *attrs
     return Primitive::emptyValue().asReturnedValue();
 }
 
-ReturnedValue Lookup::indexedGetterGeneric(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index)
-{
-    uint idx;
-    if (object.isObject() && index.asArrayIndex(idx)) {
-        l->indexedGetter = indexedGetterObjectInt;
-        return indexedGetterObjectInt(l, engine, object, index);
-    }
-    return indexedGetterFallback(l, engine, object, index);
-}
-
-ReturnedValue Lookup::indexedGetterFallback(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index)
-{
-    Q_UNUSED(l);
-    Scope scope(engine);
-    uint idx = 0;
-    bool isInt = index.asArrayIndex(idx);
-
-    ScopedObject o(scope, object);
-    if (!o) {
-        if (isInt) {
-            if (const String *str = object.as<String>()) {
-                if (idx >= (uint)str->toQString().length()) {
-                    return Encode::undefined();
-                }
-                const QString s = str->toQString().mid(idx, 1);
-                return scope.engine->newString(s)->asReturnedValue();
-            }
-        }
-
-        if (object.isNullOrUndefined()) {
-            QString message = QStringLiteral("Cannot read property '%1' of %2").arg(index.toQStringNoThrow()).arg(object.toQStringNoThrow());
-            return engine->throwTypeError(message);
-        }
-
-        o = RuntimeHelpers::convertToObject(scope.engine, object);
-        if (!o) // type error
-            return Encode::undefined();
-    }
-
-    if (isInt) {
-        if (o->d()->arrayData && !o->d()->arrayData->attrs) {
-            ScopedValue v(scope, Scoped<ArrayData>(scope, o->arrayData())->get(idx));
-            if (!v->isEmpty())
-                return v->asReturnedValue();
-        }
-
-        return o->getIndexed(idx);
-    }
-
-    ScopedString name(scope, index.toString(scope.engine));
-    if (scope.hasException())
-        return Encode::undefined();
-    return o->get(name);
-
-}
-
-
-ReturnedValue Lookup::indexedGetterObjectInt(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index)
-{
-    uint idx;
-    if (index.asArrayIndex(idx)) {
-        if (Heap::Base *b = object.heapObject()) {
-            if (b->vtable()->isObject) {
-                Heap::Object *o = static_cast<Heap::Object *>(b);
-                if (o->arrayData && o->arrayData->type == Heap::ArrayData::Simple) {
-                    Heap::SimpleArrayData *s = o->arrayData.cast<Heap::SimpleArrayData>();
-                    if (idx < s->values.size)
-                        if (!s->data(idx).isEmpty())
-                            return s->data(idx).asReturnedValue();
-                }
-            }
-        }
-    }
-
-    return indexedGetterFallback(l, engine, object, index);
-}
-
-void Lookup::indexedSetterGeneric(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index, const Value &v)
-{
-    if (Object *o = object.objectValue()) {
-        uint idx;
-        if (o->d()->arrayData && o->d()->arrayData->type == Heap::ArrayData::Simple && index.asArrayIndex(idx)) {
-            l->indexedSetter = indexedSetterObjectInt;
-            indexedSetterObjectInt(l, engine, object, index, v);
-            return;
-        }
-    }
-    indexedSetterFallback(l, engine, object, index, v);
-}
-
-void Lookup::indexedSetterFallback(Lookup *, ExecutionEngine *engine, const Value &object, const Value &index, const Value &value)
-{
-    Scope scope(engine);
-    ScopedObject o(scope, object.toObject(scope.engine));
-    if (scope.engine->hasException)
-        return;
-
-    uint idx;
-    if (index.asArrayIndex(idx)) {
-        if (o->d()->arrayData && o->d()->arrayData->type == Heap::ArrayData::Simple) {
-            Heap::SimpleArrayData *s = o->d()->arrayData.cast<Heap::SimpleArrayData>();
-            if (idx < s->values.size) {
-                s->setData(engine, idx, value);
-                return;
-            }
-        }
-        o->putIndexed(idx, value);
-        return;
-    }
-
-    ScopedString name(scope, index.toString(scope.engine));
-    o->put(name, value);
-}
-
-void Lookup::indexedSetterObjectInt(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index, const Value &v)
-{
-    uint idx;
-    if (index.asArrayIndex(idx)) {
-        if (Heap::Base *b = object.heapObject()) {
-            if (b->vtable()->isObject) {
-                Heap::Object *o = static_cast<Heap::Object *>(b);
-                if (o->arrayData && o->arrayData->type == Heap::ArrayData::Simple) {
-                    Heap::SimpleArrayData *s = o->arrayData.cast<Heap::SimpleArrayData>();
-                    if (idx < s->values.size) {
-                        s->setData(engine, idx, v);
-                        return;
-                    }
-                }
-            }
-        }
-    }
-    indexedSetterFallback(l, engine, object, index, v);
-}
-
 ReturnedValue Lookup::getterGeneric(Lookup *l, ExecutionEngine *engine, const Value &object)
 {
     if (const Object *o = object.as<Object>())
@@ -268,7 +134,7 @@ ReturnedValue Lookup::getterGeneric(Lookup *l, ExecutionEngine *engine, const Va
         Q_ASSERT(object.isString());
         proto = engine->stringPrototype();
         Scope scope(engine);
-        ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[l->nameIndex]);
+        ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[l->nameIndex]);
         if (name->equals(engine->id_length())) {
             // special case, as the property is on the object itself
             l->getter = stringLengthGetter;
@@ -289,9 +155,10 @@ ReturnedValue Lookup::getterGeneric(Lookup *l, ExecutionEngine *engine, const Va
         if (attrs.isData()) {
             if (l->level == 0) {
                 uint nInline = l->proto->vtable()->nInlineProperties;
-                if (l->index < nInline)
+                if (l->index < nInline) {
+                    l->index += l->proto->vtable()->inlinePropertyOffset;
                     l->getter = Lookup::primitiveGetter0Inline;
-                else {
+                } else {
                     l->index -= nInline;
                     l->getter = Lookup::primitiveGetter0MemberData;
                 }
@@ -369,7 +236,7 @@ ReturnedValue Lookup::getterFallback(Lookup *l, ExecutionEngine *engine, const V
     QV4::ScopedObject o(scope, object.toObject(scope.engine));
     if (!o)
         return Encode::undefined();
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[l->nameIndex]);
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[l->nameIndex]);
     return o->get(name);
 }
 
@@ -392,7 +259,7 @@ ReturnedValue Lookup::getter0Inline(Lookup *l, ExecutionEngine *engine, const Va
     Heap::Object *o = static_cast<Heap::Object *>(object.heapObject());
     if (o) {
         if (l->classList[0] == o->internalClass)
-            return o->inlinePropertyData(l->index)->asReturnedValue();
+            return o->inlinePropertyDataWithOffset(l->index)->asReturnedValue();
     }
     return getterTwoClasses(l, engine, object);
 }
@@ -435,9 +302,9 @@ ReturnedValue Lookup::getter0Inlinegetter0Inline(Lookup *l, ExecutionEngine *eng
     Heap::Object *o = static_cast<Heap::Object *>(object.heapObject());
     if (o) {
         if (l->classList[0] == o->internalClass)
-            return o->inlinePropertyData(l->index)->asReturnedValue();
+            return o->inlinePropertyDataWithOffset(l->index)->asReturnedValue();
         if (l->classList[2] == o->internalClass)
-            return o->inlinePropertyData(l->index2)->asReturnedValue();
+            return o->inlinePropertyDataWithOffset(l->index2)->asReturnedValue();
     }
     l->getter = getterFallback;
     return getterFallback(l, engine, object);
@@ -450,7 +317,7 @@ ReturnedValue Lookup::getter0Inlinegetter0MemberData(Lookup *l, ExecutionEngine
     Heap::Object *o = static_cast<Heap::Object *>(object.heapObject());
     if (o) {
         if (l->classList[0] == o->internalClass)
-            return o->inlinePropertyData(l->index)->asReturnedValue();
+            return o->inlinePropertyDataWithOffset(l->index)->asReturnedValue();
         if (l->classList[2] == o->internalClass)
             return o->memberData->values.data()[l->index2].asReturnedValue();
     }
@@ -480,7 +347,7 @@ ReturnedValue Lookup::getter0Inlinegetter1(Lookup *l, ExecutionEngine *engine, c
     Heap::Object *o = static_cast<Heap::Object *>(object.heapObject());
     if (o) {
         if (l->classList[0] == o->internalClass)
-            return o->inlinePropertyData(l->index)->asReturnedValue();
+            return o->inlinePropertyDataWithOffset(l->index)->asReturnedValue();
         if (l->classList[2] == o->internalClass && l->classList[3] == o->prototype()->internalClass)
             return o->prototype()->propertyData(l->index2)->asReturnedValue();
     }
@@ -534,10 +401,9 @@ ReturnedValue Lookup::getterAccessor0(Lookup *l, ExecutionEngine *engine, const
             if (!getter)
                 return Encode::undefined();
 
-            ScopedCallData callData(scope, 0);
-            callData->thisObject = object;
-            getter->call(scope, callData);
-            return scope.result.asReturnedValue();
+            JSCallData jsCallData(scope);
+            *jsCallData->thisObject = object;
+            return getter->call(jsCallData);
         }
     }
     l->getter = getterFallback;
@@ -557,10 +423,9 @@ ReturnedValue Lookup::getterAccessor1(Lookup *l, ExecutionEngine *engine, const
             if (!getter)
                 return Encode::undefined();
 
-            ScopedCallData callData(scope, 0);
-            callData->thisObject = object;
-            getter->call(scope, callData);
-            return scope.result.asReturnedValue();
+            JSCallData jsCallData(scope);
+            *jsCallData->thisObject = object;
+            return getter->call(jsCallData);
         }
     }
     l->getter = getterFallback;
@@ -583,10 +448,9 @@ ReturnedValue Lookup::getterAccessor2(Lookup *l, ExecutionEngine *engine, const
                     if (!getter)
                         return Encode::undefined();
 
-                    ScopedCallData callData(scope, 0);
-                    callData->thisObject = object;
-                    getter->call(scope, callData);
-                    return scope.result.asReturnedValue();
+                    JSCallData jsCallData(scope);
+                    *jsCallData->thisObject = object;
+                    return getter->call(jsCallData);
                 }
             }
         }
@@ -600,7 +464,7 @@ ReturnedValue Lookup::primitiveGetter0Inline(Lookup *l, ExecutionEngine *engine,
     if (object.type() == l->type) {
         Heap::Object *o = l->proto;
         if (l->classList[0] == o->internalClass)
-            return o->inlinePropertyData(l->index)->asReturnedValue();
+            return o->inlinePropertyDataWithOffset(l->index)->asReturnedValue();
     }
     l->getter = getterGeneric;
     return getterGeneric(l, engine, object);
@@ -639,10 +503,9 @@ ReturnedValue Lookup::primitiveGetterAccessor0(Lookup *l, ExecutionEngine *engin
             if (!getter)
                 return Encode::undefined();
 
-            ScopedCallData callData(scope, 0);
-            callData->thisObject = object;
-            getter->call(scope, callData);
-            return scope.result.asReturnedValue();
+            JSCallData jsCallData(scope);
+            *jsCallData->thisObject = object;
+            return getter->call(jsCallData);
         }
     }
     l->getter = getterGeneric;
@@ -660,10 +523,9 @@ ReturnedValue Lookup::primitiveGetterAccessor1(Lookup *l, ExecutionEngine *engin
             if (!getter)
                 return Encode::undefined();
 
-            ScopedCallData callData(scope, 0);
-            callData->thisObject = object;
-            getter->call(scope, callData);
-            return scope.result.asReturnedValue();
+            JSCallData jsCallData(scope);
+            *jsCallData->thisObject = object;
+            return getter->call(jsCallData);
         }
     }
     l->getter = getterGeneric;
@@ -698,9 +560,10 @@ ReturnedValue Lookup::globalGetterGeneric(Lookup *l, ExecutionEngine *engine)
         if (attrs.isData()) {
             if (l->level == 0) {
                 uint nInline = o->d()->vtable()->nInlineProperties;
-                if (l->index < nInline)
+                if (l->index < nInline) {
+                    l->index += o->d()->vtable()->inlinePropertyOffset;
                     l->globalGetter = globalGetter0Inline;
-                else {
+                } else {
                     l->index -= nInline;
                     l->globalGetter = globalGetter0MemberData;
                 }
@@ -720,7 +583,7 @@ ReturnedValue Lookup::globalGetterGeneric(Lookup *l, ExecutionEngine *engine)
         }
     }
     Scope scope(engine);
-    ScopedString n(scope, engine->current->compilationUnit->runtimeStrings[l->nameIndex]);
+    ScopedString n(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[l->nameIndex]);
     return engine->throwReferenceError(n);
 }
 
@@ -728,7 +591,7 @@ ReturnedValue Lookup::globalGetter0Inline(Lookup *l, ExecutionEngine *engine)
 {
     Object *o = engine->globalObject;
     if (l->classList[0] == o->internalClass())
-        return o->d()->inlinePropertyData(l->index)->asReturnedValue();
+        return o->d()->inlinePropertyDataWithOffset(l->index)->asReturnedValue();
 
     l->globalGetter = globalGetterGeneric;
     return globalGetterGeneric(l, engine);
@@ -780,10 +643,8 @@ ReturnedValue Lookup::globalGetterAccessor0(Lookup *l, ExecutionEngine *engine)
         if (!getter)
             return Encode::undefined();
 
-        ScopedCallData callData(scope, 0);
-        callData->thisObject = Primitive::undefinedValue();
-        getter->call(scope, callData);
-        return scope.result.asReturnedValue();
+        JSCallData jsCallData(scope);
+        return getter->call(jsCallData);
     }
     l->globalGetter = globalGetterGeneric;
     return globalGetterGeneric(l, engine);
@@ -799,10 +660,8 @@ ReturnedValue Lookup::globalGetterAccessor1(Lookup *l, ExecutionEngine *engine)
         if (!getter)
             return Encode::undefined();
 
-        ScopedCallData callData(scope, 0);
-        callData->thisObject = Primitive::undefinedValue();
-        getter->call(scope, callData);
-        return scope.result.asReturnedValue();
+        JSCallData jsCallData(scope);
+        return getter->call(jsCallData);
     }
     l->globalGetter = globalGetterGeneric;
     return globalGetterGeneric(l, engine);
@@ -821,10 +680,8 @@ ReturnedValue Lookup::globalGetterAccessor2(Lookup *l, ExecutionEngine *engine)
                 if (!getter)
                     return Encode::undefined();
 
-                ScopedCallData callData(scope, 0);
-                callData->thisObject = Primitive::undefinedValue();
-                getter->call(scope, callData);
-                return scope.result.asReturnedValue();
+                JSCallData jsCallData(scope);
+                return getter->call(jsCallData);
             }
         }
     }
@@ -832,87 +689,88 @@ ReturnedValue Lookup::globalGetterAccessor2(Lookup *l, ExecutionEngine *engine)
     return globalGetterGeneric(l, engine);
 }
 
-void Lookup::setterGeneric(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
+bool Lookup::setterGeneric(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
 {
     Scope scope(engine);
     ScopedObject o(scope, object);
     if (!o) {
         o = RuntimeHelpers::convertToObject(scope.engine, object);
         if (!o) // type error
-            return;
-        ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[l->nameIndex]);
-        o->put(name, value);
-        return;
+            return false;
+        ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[l->nameIndex]);
+        return o->put(name, value);
     }
-    o->setLookup(l, value);
+    return o->setLookup(l, value);
 }
 
-void Lookup::setterTwoClasses(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
+bool Lookup::setterTwoClasses(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
 {
     Lookup l1 = *l;
 
     if (Object *o = object.as<Object>()) {
-        o->setLookup(l, value);
+        if (!o->setLookup(l, value))
+            return false;
 
         if (l->setter == Lookup::setter0 || l->setter == Lookup::setter0Inline) {
             l->setter = setter0setter0;
             l->classList[1] = l1.classList[0];
             l->index2 = l1.index;
-            return;
+            return true;
         }
     }
 
     l->setter = setterFallback;
-    setterFallback(l, engine, object, value);
+    return setterFallback(l, engine, object, value);
 }
 
-void Lookup::setterFallback(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
+bool Lookup::setterFallback(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
 {
     QV4::Scope scope(engine);
     QV4::ScopedObject o(scope, object.toObject(scope.engine));
-    if (o) {
-        ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[l->nameIndex]);
-        o->put(name, value);
-    }
+    if (!o)
+        return false;
+
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[l->nameIndex]);
+    return o->put(name, value);
 }
 
-void Lookup::setter0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
+bool Lookup::setter0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
 {
     Object *o = static_cast<Object *>(object.managed());
     if (o && o->internalClass() == l->classList[0]) {
         o->setProperty(engine, l->index, value);
-        return;
+        return true;
     }
 
-    setterTwoClasses(l, engine, object, value);
+    return setterTwoClasses(l, engine, object, value);
 }
 
-void Lookup::setter0Inline(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
+bool Lookup::setter0Inline(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
 {
     Object *o = static_cast<Object *>(object.managed());
     if (o && o->internalClass() == l->classList[0]) {
         o->d()->setInlineProperty(engine, l->index, value);
-        return;
+        return true;
     }
 
-    setterTwoClasses(l, engine, object, value);
+    return setterTwoClasses(l, engine, object, value);
 }
 
-void Lookup::setterInsert0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
+bool Lookup::setterInsert0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
 {
     Object *o = static_cast<Object *>(object.managed());
     if (o && o->internalClass() == l->classList[0]) {
         Q_ASSERT(!o->prototype());
         o->setInternalClass(l->classList[3]);
         o->setProperty(l->index, value);
-        return;
+        return true;
     }
 
     l->setter = setterFallback;
-    setterFallback(l, engine, object, value);
+    return setterFallback(l, engine, object, value);
 }
 
-void Lookup::setterInsert1(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
+bool Lookup::setterInsert1(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
 {
     Object *o = static_cast<Object *>(object.managed());
     if (o && o->internalClass() == l->classList[0]) {
@@ -922,15 +780,15 @@ void Lookup::setterInsert1(Lookup *l, ExecutionEngine *engine, Value &object, co
             Q_ASSERT(!p->prototype());
             o->setInternalClass(l->classList[3]);
             o->setProperty(l->index, value);
-            return;
+            return true;
         }
     }
 
     l->setter = setterFallback;
-    setterFallback(l, engine, object, value);
+    return setterFallback(l, engine, object, value);
 }
 
-void Lookup::setterInsert2(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
+bool Lookup::setterInsert2(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
 {
     Object *o = static_cast<Object *>(object.managed());
     if (o && o->internalClass() == l->classList[0]) {
@@ -943,32 +801,31 @@ void Lookup::setterInsert2(Lookup *l, ExecutionEngine *engine, Value &object, co
                 Q_ASSERT(!p->prototype());
                 o->setInternalClass(l->classList[3]);
                 o->setProperty(l->index, value);
-                return;
+                return true;
             }
         }
     }
 
     l->setter = setterFallback;
-    setterFallback(l, engine, object, value);
+    return setterFallback(l, engine, object, value);
 }
 
-void Lookup::setter0setter0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
+bool Lookup::setter0setter0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value)
 {
     Object *o = static_cast<Object *>(object.managed());
     if (o) {
         if (o->internalClass() == l->classList[0]) {
             o->setProperty(l->index, value);
-            return;
+            return true;
         }
         if (o->internalClass() == l->classList[1]) {
             o->setProperty(l->index2, value);
-            return;
+            return true;
         }
     }
 
     l->setter = setterFallback;
-    setterFallback(l, engine, object, value);
-
+    return setterFallback(l, engine, object, value);
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/jsruntime/qv4lookup_p.h b/src/qml/jsruntime/qv4lookup_p.h
index ce5189a780..826760aa2d 100644
--- a/src/qml/jsruntime/qv4lookup_p.h
+++ b/src/qml/jsruntime/qv4lookup_p.h
@@ -67,11 +67,9 @@ namespace QV4 {
 struct Lookup {
     enum { Size = 4 };
     union {
-        ReturnedValue (*indexedGetter)(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index);
-        void (*indexedSetter)(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index, const Value &v);
         ReturnedValue (*getter)(Lookup *l, ExecutionEngine *engine, const Value &object);
         ReturnedValue (*globalGetter)(Lookup *l, ExecutionEngine *engine);
-        void (*setter)(Lookup *l, ExecutionEngine *engine, Value &object, const Value &v);
+        bool (*setter)(Lookup *l, ExecutionEngine *engine, Value &object, const Value &v);
     };
     union {
         InternalClass *classList[Size];
@@ -90,14 +88,6 @@ struct Lookup {
     uint index;
     uint nameIndex;
 
-    static ReturnedValue indexedGetterGeneric(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index);
-    static ReturnedValue indexedGetterFallback(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index);
-    static ReturnedValue indexedGetterObjectInt(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index);
-
-    static void indexedSetterGeneric(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index, const Value &v);
-    static void indexedSetterFallback(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index, const Value &value);
-    static void indexedSetterObjectInt(Lookup *l, ExecutionEngine *engine, const Value &object, const Value &index, const Value &v);
-
     static ReturnedValue getterGeneric(Lookup *l, ExecutionEngine *engine, const Value &object);
     static ReturnedValue getterTwoClasses(Lookup *l, ExecutionEngine *engine, const Value &object);
     static ReturnedValue getterFallback(Lookup *l, ExecutionEngine *engine, const Value &object);
@@ -133,15 +123,15 @@ struct Lookup {
     static ReturnedValue globalGetterAccessor1(Lookup *l, ExecutionEngine *engine);
     static ReturnedValue globalGetterAccessor2(Lookup *l, ExecutionEngine *engine);
 
-    static void setterGeneric(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
-    static void setterTwoClasses(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
-    static void setterFallback(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
-    static void setter0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
-    static void setter0Inline(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
-    static void setterInsert0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
-    static void setterInsert1(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
-    static void setterInsert2(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
-    static void setter0setter0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
+    static bool setterGeneric(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
+    static bool setterTwoClasses(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
+    static bool setterFallback(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
+    static bool setter0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
+    static bool setter0Inline(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
+    static bool setterInsert0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
+    static bool setterInsert1(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
+    static bool setterInsert2(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
+    static bool setter0setter0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value);
 
     ReturnedValue lookup(const Value &thisObject, Object *obj, PropertyAttributes *attrs);
     ReturnedValue lookup(const Object *obj, PropertyAttributes *attrs);
@@ -151,7 +141,6 @@ struct Lookup {
 Q_STATIC_ASSERT(std::is_standard_layout<Lookup>::value);
 // Ensure that these offsets are always at this point to keep generated code compatible
 // across 32-bit and 64-bit (matters when cross-compiling).
-Q_STATIC_ASSERT(offsetof(Lookup, indexedGetter) == 0);
 Q_STATIC_ASSERT(offsetof(Lookup, getter) == 0);
 
 }
diff --git a/src/qml/jsruntime/qv4managed.cpp b/src/qml/jsruntime/qv4managed.cpp
index e00eaa0d9b..200380eda0 100644
--- a/src/qml/jsruntime/qv4managed.cpp
+++ b/src/qml/jsruntime/qv4managed.cpp
@@ -49,7 +49,6 @@ const VTable Managed::static_vtbl =
     0,
     0,
     0,
-    0,
     Managed::IsExecutionContext,
     Managed::IsString,
     Managed::IsObject,
diff --git a/src/qml/jsruntime/qv4managed_p.h b/src/qml/jsruntime/qv4managed_p.h
index 40dfc244ea..f81dcf9479 100644
--- a/src/qml/jsruntime/qv4managed_p.h
+++ b/src/qml/jsruntime/qv4managed_p.h
@@ -93,7 +93,6 @@ inline void qYouForgotTheQ_MANAGED_Macro(T1, T2) {}
             dptr->_checkIsInitialized(); \
             return dptr; \
         } \
-        static Q_CONSTEXPR quint64 markTable = QV4::Heap::DataClass::markTable; \
         V4_ASSERT_IS_TRIVIAL(QV4::Heap::DataClass)
 
 #define V4_MANAGED(DataClass, superClass) \
@@ -132,9 +131,8 @@ inline void qYouForgotTheQ_MANAGED_Macro(T1, T2) {}
 #define DEFINE_MANAGED_VTABLE_INT(classname, parentVTable) \
 {     \
     parentVTable, \
-    markTable, \
     (sizeof(classname::Data) + sizeof(QV4::Value) - 1)/sizeof(QV4::Value), \
-    (sizeof(classname::Data) + (std::is_same<classname, Object>::value ? 2*sizeof(QV4::Value) : 0) + QV4::Chunk::SlotSize - 1)/QV4::Chunk::SlotSize*QV4::Chunk::SlotSize/sizeof(QV4::Value) \
+    (sizeof(classname::Data) + (classname::NInlineProperties*sizeof(QV4::Value)) + QV4::Chunk::SlotSize - 1)/QV4::Chunk::SlotSize*QV4::Chunk::SlotSize/sizeof(QV4::Value) \
         - (sizeof(classname::Data) + sizeof(QV4::Value) - 1)/sizeof(QV4::Value), \
     classname::IsExecutionContext,   \
     classname::IsString,   \
@@ -146,9 +144,9 @@ inline void qYouForgotTheQ_MANAGED_Macro(T1, T2) {}
     classname::MyType,                          \
     #classname, \
     Q_VTABLE_FUNCTION(classname, destroy),                                    \
-    Q_VTABLE_FUNCTION(classname, markObjects),                                    \
+    classname::Data::markObjects,                                    \
     isEqualTo                                  \
-}
+} \
 
 #define DEFINE_MANAGED_VTABLE(classname) \
 QT_WARNING_SUPPRESS_GCC_TAUTOLOGICAL_COMPARE_ON \
@@ -176,6 +174,7 @@ private:
     Q_DISABLE_COPY(Managed)
 
 public:
+    enum { NInlineProperties = 0 };
 
     enum Type {
         Type_Invalid,
@@ -221,7 +220,6 @@ public:
     inline void mark(MarkStack *markStack);
 
     static void destroy(Heap::Base *) {}
-    static void markObjects(Heap::Base *, MarkStack *) {}
 
     Q_ALWAYS_INLINE Heap::Base *heapObject() const {
         return m();
@@ -240,6 +238,11 @@ private:
     friend struct ObjectIterator;
 };
 
+inline void Managed::mark(MarkStack *markStack)
+{
+    Q_ASSERT(m());
+    m()->mark(markStack);
+}
 
 template<>
 inline const Managed *Value::as() const {
diff --git a/src/qml/jsruntime/qv4mathobject.cpp b/src/qml/jsruntime/qv4mathobject.cpp
index 46230b5bc1..252ec345d9 100644
--- a/src/qml/jsruntime/qv4mathobject.cpp
+++ b/src/qml/jsruntime/qv4mathobject.cpp
@@ -94,54 +94,54 @@ static Q_ALWAYS_INLINE double copySign(double x, double y)
     return ::copysign(x, y);
 }
 
-void MathObject::method_abs(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_abs(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    if (!callData->argc)
+    if (!argc)
         RETURN_RESULT(Encode(qt_qnan()));
 
-    if (callData->args[0].isInteger()) {
-        int i = callData->args[0].integerValue();
+    if (argv[0].isInteger()) {
+        int i = argv[0].integerValue();
         RETURN_RESULT(Encode(i < 0 ? - i : i));
     }
 
-    double v = callData->args[0].toNumber();
+    double v = argv[0].toNumber();
     if (v == 0) // 0 | -0
         RETURN_RESULT(Encode(0));
 
     RETURN_RESULT(Encode(v < 0 ? -v : v));
 }
 
-void MathObject::method_acos(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_acos(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : 2;
+    double v = argc ? argv[0].toNumber() : 2;
     if (v > 1)
         RETURN_RESULT(Encode(qt_qnan()));
 
     RETURN_RESULT(Encode(std::acos(v)));
 }
 
-void MathObject::method_asin(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_asin(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : 2;
+    double v = argc ? argv[0].toNumber() : 2;
     if (v > 1)
         RETURN_RESULT(Encode(qt_qnan()));
     else
         RETURN_RESULT(Encode(std::asin(v)));
 }
 
-void MathObject::method_atan(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_atan(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : qt_qnan();
+    double v = argc ? argv[0].toNumber() : qt_qnan();
     if (v == 0.0)
         RETURN_RESULT(Encode(v));
     else
         RETURN_RESULT(Encode(std::atan(v)));
 }
 
-void MathObject::method_atan2(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_atan2(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v1 = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    double v2 = callData->argc > 1 ? callData->args[1].toNumber() : qt_qnan();
+    double v1 = argc ? argv[0].toNumber() : qt_qnan();
+    double v2 = argc > 1 ? argv[1].toNumber() : qt_qnan();
 
     if ((v1 < 0) && qt_is_finite(v1) && qt_is_inf(v2) && (copySign(1.0, v2) == 1.0))
         RETURN_RESULT(Encode(copySign(0, -1.0)));
@@ -156,24 +156,24 @@ void MathObject::method_atan2(const BuiltinFunction *, Scope &scope, CallData *c
     RETURN_RESULT(Encode(std::atan2(v1, v2)));
 }
 
-void MathObject::method_ceil(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_ceil(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : qt_qnan();
+    double v = argc ? argv[0].toNumber() : qt_qnan();
     if (v < 0.0 && v > -1.0)
         RETURN_RESULT(Encode(copySign(0, -1.0)));
     else
         RETURN_RESULT(Encode(std::ceil(v)));
 }
 
-void MathObject::method_cos(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_cos(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : qt_qnan();
+    double v = argc ? argv[0].toNumber() : qt_qnan();
     RETURN_RESULT(Encode(std::cos(v)));
 }
 
-void MathObject::method_exp(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_exp(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : qt_qnan();
+    double v = argc ? argv[0].toNumber() : qt_qnan();
     if (qt_is_inf(v)) {
         if (copySign(1.0, v) == -1.0)
             RETURN_RESULT(Encode(0));
@@ -184,37 +184,39 @@ void MathObject::method_exp(const BuiltinFunction *, Scope &scope, CallData *cal
     }
 }
 
-void MathObject::method_floor(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_floor(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : qt_qnan();
-    RETURN_RESULT(Encode(std::floor(v)));
+    double v = argc ? argv[0].toNumber() : qt_qnan();
+    Value result = Primitive::fromDouble(std::floor(v));
+    result.isInt32();
+    RETURN_RESULT(result);
 }
 
-void MathObject::method_log(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_log(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : qt_qnan();
+    double v = argc ? argv[0].toNumber() : qt_qnan();
     if (v < 0)
         RETURN_RESULT(Encode(qt_qnan()));
     else
         RETURN_RESULT(Encode(std::log(v)));
 }
 
-void MathObject::method_max(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_max(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
     double mx = -qt_inf();
-    for (int i = 0; i < callData->argc; ++i) {
-        double x = callData->args[i].toNumber();
+    for (int i = 0, ei = argc; i < ei; ++i) {
+        double x = argv[i].toNumber();
         if (x > mx || std::isnan(x))
             mx = x;
     }
     RETURN_RESULT(Encode(mx));
 }
 
-void MathObject::method_min(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_min(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
     double mx = qt_inf();
-    for (int i = 0; i < callData->argc; ++i) {
-        double x = callData->args[i].toNumber();
+    for (int i = 0, ei = argc; i < ei; ++i) {
+        double x = argv[i].toNumber();
         if ((x == 0 && mx == x && copySign(1.0, x) == -1.0)
                 || (x < mx) || std::isnan(x)) {
             mx = x;
@@ -223,10 +225,10 @@ void MathObject::method_min(const BuiltinFunction *, Scope &scope, CallData *cal
     RETURN_RESULT(Encode(mx));
 }
 
-void MathObject::method_pow(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_pow(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double x = callData->argc > 0 ? callData->args[0].toNumber() : qt_qnan();
-    double y = callData->argc > 1 ? callData->args[1].toNumber() : qt_qnan();
+    double x = argc > 0 ? argv[0].toNumber() : qt_qnan();
+    double y = argc > 1 ? argv[1].toNumber() : qt_qnan();
 
     if (std::isnan(y))
         RETURN_RESULT(Encode(qt_qnan()));
@@ -273,21 +275,21 @@ void MathObject::method_pow(const BuiltinFunction *, Scope &scope, CallData *cal
     RETURN_RESULT(Encode(qt_qnan()));
 }
 
-void MathObject::method_random(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue MathObject::method_random(const FunctionObject *, const Value *, const Value *, int)
 {
     RETURN_RESULT(Encode(QRandomGenerator::getReal()));
 }
 
-void MathObject::method_round(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_round(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : qt_qnan();
+    double v = argc ? argv[0].toNumber() : qt_qnan();
     v = copySign(std::floor(v + 0.5), v);
     RETURN_RESULT(Encode(v));
 }
 
-void MathObject::method_sign(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_sign(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : qt_qnan();
+    double v = argc ? argv[0].toNumber() : qt_qnan();
 
     if (std::isnan(v))
         RETURN_RESULT(Encode(qt_qnan()));
@@ -298,21 +300,21 @@ void MathObject::method_sign(const BuiltinFunction *, Scope &scope, CallData *ca
     RETURN_RESULT(Encode(std::signbit(v) ? -1 : 1));
 }
 
-void MathObject::method_sin(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_sin(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : qt_qnan();
+    double v = argc ? argv[0].toNumber() : qt_qnan();
     RETURN_RESULT(Encode(std::sin(v)));
 }
 
-void MathObject::method_sqrt(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_sqrt(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : qt_qnan();
+    double v = argc ? argv[0].toNumber() : qt_qnan();
     RETURN_RESULT(Encode(std::sqrt(v)));
 }
 
-void MathObject::method_tan(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue MathObject::method_tan(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double v = callData->argc ? callData->args[0].toNumber() : qt_qnan();
+    double v = argc ? argv[0].toNumber() : qt_qnan();
     if (v == 0.0)
         RETURN_RESULT(Encode(v));
     else
diff --git a/src/qml/jsruntime/qv4mathobject_p.h b/src/qml/jsruntime/qv4mathobject_p.h
index e617712905..0bf5da9404 100644
--- a/src/qml/jsruntime/qv4mathobject_p.h
+++ b/src/qml/jsruntime/qv4mathobject_p.h
@@ -69,25 +69,25 @@ struct MathObject: Object
     V4_OBJECT2(MathObject, Object)
     Q_MANAGED_TYPE(MathObject)
 
-    static void method_abs(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_acos(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_asin(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_atan(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_atan2(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_ceil(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_cos(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_exp(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_floor(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_log(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_max(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_min(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_pow(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_random(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_round(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_sign(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_sin(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_sqrt(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_tan(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_abs(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_acos(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_asin(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_atan(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_atan2(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_ceil(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_cos(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_exp(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_floor(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_log(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_max(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_min(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_pow(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_random(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_round(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_sign(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_sin(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_sqrt(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_tan(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 }
diff --git a/src/qml/jsruntime/qv4memberdata_p.h b/src/qml/jsruntime/qv4memberdata_p.h
index bae524d088..3e231d693b 100644
--- a/src/qml/jsruntime/qv4memberdata_p.h
+++ b/src/qml/jsruntime/qv4memberdata_p.h
@@ -63,7 +63,7 @@ namespace Heap {
     Member(class, ValueArray, ValueArray, values)
 
 DECLARE_HEAP_OBJECT(MemberData, Base) {
-    DECLARE_MARK_TABLE(MemberData);
+    DECLARE_MARKOBJECTS(MemberData);
 };
 V4_ASSERT_IS_TRIVIAL(MemberData)
 
diff --git a/src/qml/jsruntime/qv4numberobject.cpp b/src/qml/jsruntime/qv4numberobject.cpp
index d5c80dbf80..f58ff45801 100644
--- a/src/qml/jsruntime/qv4numberobject.cpp
+++ b/src/qml/jsruntime/qv4numberobject.cpp
@@ -78,16 +78,16 @@ void Heap::NumberCtor::init(QV4::ExecutionContext *scope)
     Heap::FunctionObject::init(scope, QStringLiteral("Number"));
 }
 
-void NumberCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue NumberCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    double dbl = callData->argc ? callData->args[0].toNumber() : 0.;
-    scope.result = Encode(scope.engine->newNumberObject(dbl));
+    double dbl = argc ? argv[0].toNumber() : 0.;
+    return Encode(f->engine()->newNumberObject(dbl));
 }
 
-void NumberCtor::call(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue NumberCtor::call(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    double dbl = callData->argc ? callData->args[0].toNumber() : 0.;
-    scope.result = Encode(dbl);
+    double dbl = argc ? argv[0].toNumber() : 0.;
+    return Encode(dbl);
 }
 
 void NumberPrototype::init(ExecutionEngine *engine, Object *ctor)
@@ -124,119 +124,101 @@ QT_WARNING_POP
     defineDefaultProperty(QStringLiteral("toPrecision"), method_toPrecision, 1);
 }
 
-inline ReturnedValue thisNumberValue(Scope &scope, CallData *callData)
+inline ReturnedValue thisNumberValue(ExecutionEngine *v4, const Value *thisObject)
 {
-    if (callData->thisObject.isNumber())
-        return callData->thisObject.asReturnedValue();
-    NumberObject *n = callData->thisObject.as<NumberObject>();
+    if (thisObject->isNumber())
+        return thisObject->asReturnedValue();
+    const NumberObject *n = thisObject->as<NumberObject>();
     if (!n) {
-        scope.engine->throwTypeError();
+        v4->throwTypeError();
         return Encode::undefined();
     }
     return Encode(n->value());
 }
 
-inline double thisNumber(Scope &scope, CallData *callData)
+inline double thisNumber(ExecutionEngine *engine, const Value *thisObject)
 {
-    if (callData->thisObject.isNumber())
-        return callData->thisObject.asDouble();
-    NumberObject *n = callData->thisObject.as<NumberObject>();
+    if (thisObject->isNumber())
+        return thisObject->asDouble();
+    const NumberObject *n = thisObject->as<NumberObject>();
     if (!n) {
-        scope.engine->throwTypeError();
+        engine->throwTypeError();
         return 0;
     }
     return n->value();
 }
 
-void NumberPrototype::method_isFinite(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue NumberPrototype::method_isFinite(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    if (!callData->argc) {
-        scope.result = Encode(false);
-        return;
-    }
+    if (!argc)
+        return Encode(false);
 
-    double v = callData->args[0].toNumber();
-    scope.result = Encode(!std::isnan(v) && !qt_is_inf(v));
+    double v = argv[0].toNumber();
+    return Encode(!std::isnan(v) && !qt_is_inf(v));
 }
 
-void NumberPrototype::method_isInteger(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue NumberPrototype::method_isInteger(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    if (!callData->argc) {
-        scope.result = Encode(false);
-        return;
-    }
+    if (!argc)
+        return Encode(false);
 
-    const Value &v = callData->args[0];
-    if (!v.isNumber()) {
-        scope.result = Encode(false);
-        return;
-    }
+    const Value &v = argv[0];
+    if (!v.isNumber())
+        return Encode(false);
 
     double dv = v.toNumber();
-    if (std::isnan(dv) || qt_is_inf(dv)) {
-        scope.result = Encode(false);
-        return;
-    }
+    if (std::isnan(dv) || qt_is_inf(dv))
+        return Encode(false);
 
     double iv = v.toInteger();
-    scope.result = Encode(dv == iv);
+    return Encode(dv == iv);
 }
 
-void NumberPrototype::method_isSafeInteger(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue NumberPrototype::method_isSafeInteger(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    if (!callData->argc) {
-        scope.result = Encode(false);
-        return;
-    }
+    if (!argc)
+        return Encode(false);
 
-    const Value &v = callData->args[0];
-    if (!v.isNumber()) {
-        scope.result = Encode(false);
-        return;
-    }
+    const Value &v = argv[0];
+    if (!v.isNumber())
+        return Encode(false);
 
     double dv = v.toNumber();
-    if (std::isnan(dv) || qt_is_inf(dv)) {
-        scope.result = Encode(false);
-        return;
-    }
+    if (std::isnan(dv) || qt_is_inf(dv))
+        return Encode(false);
 
     double iv = v.toInteger();
-    scope.result = Encode(dv == iv && std::fabs(iv) <= (2^53)-1);
+    return Encode(dv == iv && std::fabs(iv) <= (2^53)-1);
 }
 
-void NumberPrototype::method_isNaN(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue NumberPrototype::method_isNaN(const FunctionObject *, const Value *, const Value *argv, int argc)
 {
-    if (!callData->argc) {
-        scope.result = Encode(false);
-        return;
-    }
+    if (!argc)
+        return Encode(false);
 
-    double v = callData->args[0].toNumber();
+    double v = argv[0].toNumber();
     // cast to bool explicitly as std::isnan() may give us ::isnan(), which
     // sometimes returns an int and we don't want the Encode(int) overload.
-    scope.result = Encode(bool(std::isnan(v)));
+    return Encode(bool(std::isnan(v)));
 }
 
-void NumberPrototype::method_toString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue NumberPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    double num = thisNumber(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    double num = thisNumber(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
-    if (callData->argc && !callData->args[0].isUndefined()) {
-        int radix = callData->args[0].toInt32();
+    if (argc && !argv[0].isUndefined()) {
+        int radix = argv[0].toInt32();
         if (radix < 2 || radix > 36) {
-            scope.result = scope.engine->throwError(QStringLiteral("Number.prototype.toString: %0 is not a valid radix")
-                            .arg(radix));
-            return;
+            return v4->throwError(QStringLiteral("Number.prototype.toString: %0 is not a valid radix").arg(radix));
         }
 
         if (std::isnan(num)) {
-            scope.result = scope.engine->newString(QStringLiteral("NaN"));
-            return;
+            return Encode(v4->newString(QStringLiteral("NaN")));
         } else if (qt_is_inf(num)) {
-            scope.result = scope.engine->newString(QLatin1String(num < 0 ? "-Infinity" : "Infinity"));
-            return;
+            return Encode(v4->newString(QLatin1String(num < 0 ? "-Infinity" : "Infinity")));
         }
 
         if (radix != 10) {
@@ -266,43 +248,42 @@ void NumberPrototype::method_toString(const BuiltinFunction *, Scope &scope, Cal
             }
             if (negative)
                 str.prepend(QLatin1Char('-'));
-            scope.result = scope.engine->newString(str);
-            return;
+            return Encode(v4->newString(str));
         }
     }
 
-    scope.result = Primitive::fromDouble(num).toString(scope.engine);
+    return Encode(Primitive::fromDouble(num).toString(v4));
 }
 
-void NumberPrototype::method_toLocaleString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue NumberPrototype::method_toLocaleString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    ScopedValue v(scope, thisNumberValue(scope, callData));
-    scope.result = v->toString(scope.engine);
-    CHECK_EXCEPTION();
+    Scope scope(b);
+    ScopedValue v(scope, thisNumberValue(b->engine(), thisObject));
+    return Encode(v->toString(scope.engine));
 }
 
-void NumberPrototype::method_valueOf(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue NumberPrototype::method_valueOf(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    scope.result = thisNumberValue(scope, callData);
+    return thisNumberValue(b->engine(), thisObject);
 }
 
-void NumberPrototype::method_toFixed(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue NumberPrototype::method_toFixed(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    double v = thisNumber(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    double v = thisNumber(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     double fdigits = 0;
 
-    if (callData->argc > 0)
-        fdigits = callData->args[0].toInteger();
+    if (argc > 0)
+        fdigits = argv[0].toInteger();
 
     if (std::isnan(fdigits))
         fdigits = 0;
 
-    if (fdigits < 0 || fdigits > 20) {
-        scope.result = scope.engine->throwRangeError(callData->thisObject);
-        return;
-    }
+    if (fdigits < 0 || fdigits > 20)
+        return v4->throwRangeError(*thisObject);
 
     QString str;
     if (std::isnan(v))
@@ -312,49 +293,51 @@ void NumberPrototype::method_toFixed(const BuiltinFunction *, Scope &scope, Call
     else if (v < 1.e21)
         str = NumberLocale::instance()->toString(v, 'f', int(fdigits));
     else {
-        scope.result = RuntimeHelpers::stringFromNumber(scope.engine, v);
-        return;
+        return Encode(RuntimeHelpers::stringFromNumber(v4, v));
     }
-    scope.result = scope.engine->newString(str);
+    return Encode(v4->newString(str));
 }
 
-void NumberPrototype::method_toExponential(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue NumberPrototype::method_toExponential(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    double d = thisNumber(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    double d = thisNumber(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
+
 
     int fdigits = NumberLocale::instance()->defaultDoublePrecision;
 
-    if (callData->argc && !callData->args[0].isUndefined()) {
-        fdigits = callData->args[0].toInt32();
+    if (argc && !argv[0].isUndefined()) {
+        fdigits = argv[0].toInt32();
         if (fdigits < 0 || fdigits > 20) {
-            ScopedString error(scope, scope.engine->newString(QStringLiteral("Number.prototype.toExponential: fractionDigits out of range")));
-            scope.result = scope.engine->throwRangeError(error);
-            return;
+            Scope scope(v4);
+            ScopedString error(scope, v4->newString(QStringLiteral("Number.prototype.toExponential: fractionDigits out of range")));
+            return v4->throwRangeError(error);
         }
     }
 
     QString result = NumberLocale::instance()->toString(d, 'e', fdigits);
-    scope.result = scope.engine->newString(result);
+    return Encode(v4->newString(result));
 }
 
-void NumberPrototype::method_toPrecision(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue NumberPrototype::method_toPrecision(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedValue v(scope, thisNumberValue(scope, callData));
-    CHECK_EXCEPTION();
+    Scope scope(b);
+    ScopedValue v(scope, thisNumberValue(scope.engine, thisObject));
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
-    if (!callData->argc || callData->args[0].isUndefined()) {
-        scope.result = v->toString(scope.engine);
-        return;
-    }
 
-    int precision = callData->args[0].toInt32();
+    if (!argc || argv[0].isUndefined())
+        return Encode(v->toString(scope.engine));
+
+    int precision = argv[0].toInt32();
     if (precision < 1 || precision > 21) {
         ScopedString error(scope, scope.engine->newString(QStringLiteral("Number.prototype.toPrecision: precision out of range")));
-        scope.result = scope.engine->throwRangeError(error);
-        return;
+        return scope.engine->throwRangeError(error);
     }
 
     QString result = NumberLocale::instance()->toString(v->asDouble(), 'g', precision);
-    scope.result = scope.engine->newString(result);
+    return Encode(scope.engine->newString(result));
 }
diff --git a/src/qml/jsruntime/qv4numberobject_p.h b/src/qml/jsruntime/qv4numberobject_p.h
index 0bc2cd8c65..cfdcf9bc1d 100644
--- a/src/qml/jsruntime/qv4numberobject_p.h
+++ b/src/qml/jsruntime/qv4numberobject_p.h
@@ -79,8 +79,8 @@ struct NumberCtor: FunctionObject
 {
     V4_OBJECT2(NumberCtor, FunctionObject)
 
-    static void construct(const Managed *that, Scope &scope, CallData *callData);
-    static void call(const Managed *, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct NumberPrototype: NumberObject
@@ -88,16 +88,16 @@ struct NumberPrototype: NumberObject
     V4_PROTOTYPE(objectPrototype)
     void init(ExecutionEngine *engine, Object *ctor);
 
-    static void method_isFinite(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_isInteger(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_isSafeInteger(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_isNaN(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toLocaleString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_valueOf(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toFixed(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toExponential(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toPrecision(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_isFinite(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_isInteger(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_isSafeInteger(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_isNaN(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toLocaleString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_valueOf(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toFixed(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toExponential(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toPrecision(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 
diff --git a/src/qml/jsruntime/qv4object.cpp b/src/qml/jsruntime/qv4object.cpp
index 94d5a74fe5..97296eb847 100644
--- a/src/qml/jsruntime/qv4object.cpp
+++ b/src/qml/jsruntime/qv4object.cpp
@@ -38,8 +38,6 @@
 ****************************************************************************/
 
 #include "qv4object_p.h"
-#include "qv4jsir_p.h"
-#include "qv4isel_p.h"
 #include "qv4objectproto_p.h"
 #include "qv4stringobject_p.h"
 #include "qv4argumentsobject_p.h"
@@ -51,6 +49,7 @@
 #include "qv4identifier_p.h"
 #include "qv4string_p.h"
 #include "qv4identifiertable_p.h"
+#include "qv4jscall_p.h"
 
 #include <stdint.h>
 
@@ -108,10 +107,9 @@ ReturnedValue Object::getValue(const Value &thisObject, const Value &v, Property
         return Encode::undefined();
 
     Scope scope(f->engine());
-    ScopedCallData callData(scope);
-    callData->thisObject = thisObject;
-    f->call(scope, callData);
-    return scope.result.asReturnedValue();
+    JSCallData jsCallData(scope);
+    *jsCallData->thisObject = thisObject;
+    return f->call(jsCallData);
 }
 
 bool Object::putValue(uint memberIndex, const Value &value)
@@ -127,25 +125,20 @@ bool Object::putValue(uint memberIndex, const Value &value)
         if (set) {
             Scope scope(ic->engine);
             ScopedFunctionObject setter(scope, set);
-            ScopedCallData callData(scope, 1);
-            callData->args[0] = value;
-            callData->thisObject = this;
-            setter->call(scope, callData);
+            JSCallData jsCallData(scope, 1);
+            jsCallData->args[0] = value;
+            *jsCallData->thisObject = this;
+            setter->call(jsCallData);
             return !ic->engine->hasException;
         }
-        goto reject;
+        return false;
     }
 
     if (!attrs.isWritable())
-        goto reject;
+        return false;
 
     setProperty(memberIndex, value);
     return true;
-
-  reject:
-    if (engine()->current->strictMode)
-        engine()->throwTypeError();
-    return false;
 }
 
 void Object::defineDefaultProperty(const QString &name, const Value &value)
@@ -156,7 +149,28 @@ void Object::defineDefaultProperty(const QString &name, const Value &value)
     defineDefaultProperty(s, value);
 }
 
-void Object::defineDefaultProperty(const QString &name, void (*code)(const BuiltinFunction *, Scope &, CallData *), int argumentCount)
+void Object::defineDefaultProperty(const QString &name, ReturnedValue (*code)(const BuiltinFunction *, CallData *), int argumentCount)
+{
+    ExecutionEngine *e = engine();
+    Scope scope(e);
+    ScopedString s(scope, e->newIdentifier(name));
+    ExecutionContext *global = e->rootContext();
+    ScopedFunctionObject function(scope, BuiltinFunction::create(global, s, code));
+    function->defineReadonlyConfigurableProperty(e->id_length(), Primitive::fromInt32(argumentCount));
+    defineDefaultProperty(s, function);
+}
+
+void Object::defineDefaultProperty(String *name, ReturnedValue (*code)(const BuiltinFunction *, CallData *), int argumentCount)
+{
+    ExecutionEngine *e = engine();
+    Scope scope(e);
+    ExecutionContext *global = e->rootContext();
+    ScopedFunctionObject function(scope, BuiltinFunction::create(global, name, code));
+    function->defineReadonlyConfigurableProperty(e->id_length(), Primitive::fromInt32(argumentCount));
+    defineDefaultProperty(name, function);
+}
+
+void Object::defineDefaultProperty(const QString &name, ReturnedValue (*code)(const FunctionObject *, const Value *thisObject, const Value *argv, int argc), int argumentCount)
 {
     ExecutionEngine *e = engine();
     Scope scope(e);
@@ -167,7 +181,7 @@ void Object::defineDefaultProperty(const QString &name, void (*code)(const Built
     defineDefaultProperty(s, function);
 }
 
-void Object::defineDefaultProperty(String *name, void (*code)(const BuiltinFunction *, Scope &, CallData *), int argumentCount)
+void Object::defineDefaultProperty(String *name, ReturnedValue (*code)(const FunctionObject *, const Value *thisObject, const Value *argv, int argc), int argumentCount)
 {
     ExecutionEngine *e = engine();
     Scope scope(e);
@@ -177,8 +191,29 @@ void Object::defineDefaultProperty(String *name, void (*code)(const BuiltinFunct
     defineDefaultProperty(name, function);
 }
 
-void Object::defineAccessorProperty(const QString &name, void (*getter)(const BuiltinFunction *, Scope &, CallData *),
-                                    void (*setter)(const BuiltinFunction *, Scope &, CallData *))
+void Object::defineAccessorProperty(const QString &name, ReturnedValue (*getter)(const BuiltinFunction *, CallData *),
+                                    ReturnedValue (*setter)(const BuiltinFunction *, CallData *))
+{
+    ExecutionEngine *e = engine();
+    Scope scope(e);
+    ScopedString s(scope, e->newIdentifier(name));
+    defineAccessorProperty(s, getter, setter);
+}
+
+void Object::defineAccessorProperty(String *name, ReturnedValue (*getter)(const BuiltinFunction *, CallData *),
+                                    ReturnedValue (*setter)(const BuiltinFunction *, CallData *))
+{
+    ExecutionEngine *v4 = engine();
+    QV4::Scope scope(v4);
+    ScopedProperty p(scope);
+    ExecutionContext *global = v4->rootContext();
+    p->setGetter(ScopedFunctionObject(scope, (getter ? BuiltinFunction::create(global, name, getter) : 0)));
+    p->setSetter(ScopedFunctionObject(scope, (setter ? BuiltinFunction::create(global, name, setter) : 0)));
+    insertMember(name, p, QV4::Attr_Accessor|QV4::Attr_NotConfigurable|QV4::Attr_NotEnumerable);
+}
+
+void Object::defineAccessorProperty(const QString &name, ReturnedValue (*getter)(const FunctionObject *, const Value *, const Value *, int),
+                                    ReturnedValue (*setter)(const FunctionObject *, const Value *, const Value *, int))
 {
     ExecutionEngine *e = engine();
     Scope scope(e);
@@ -186,8 +221,8 @@ void Object::defineAccessorProperty(const QString &name, void (*getter)(const Bu
     defineAccessorProperty(s, getter, setter);
 }
 
-void Object::defineAccessorProperty(String *name, void (*getter)(const BuiltinFunction *, Scope &, CallData *),
-                                    void (*setter)(const BuiltinFunction *, Scope &, CallData *))
+void Object::defineAccessorProperty(String *name, ReturnedValue (*getter)(const FunctionObject *, const Value *, const Value *, int),
+                                    ReturnedValue (*setter)(const FunctionObject *, const Value *, const Value *, int))
 {
     ExecutionEngine *v4 = engine();
     QV4::Scope scope(v4);
@@ -198,6 +233,8 @@ void Object::defineAccessorProperty(String *name, void (*getter)(const BuiltinFu
     insertMember(name, p, QV4::Attr_Accessor|QV4::Attr_NotConfigurable|QV4::Attr_NotEnumerable);
 }
 
+
+
 void Object::defineReadonlyProperty(const QString &name, const Value &value)
 {
     QV4::ExecutionEngine *e = engine();
@@ -224,9 +261,21 @@ void Object::defineReadonlyConfigurableProperty(String *name, const Value &value
     insertMember(name, value, Attr_ReadOnly_ButConfigurable);
 }
 
-void Object::markObjects(Heap::Base *b, MarkStack *stack)
+void Object::markObjects(Heap::Base *base, MarkStack *stack)
 {
-    Heap::Object *o = static_cast<Heap::Object *>(b);
+    Heap::Object::markObjects(base, stack);
+}
+
+void Heap::Object::markObjects(Heap::Base *b, MarkStack *stack)
+{
+    Object *o = static_cast<Object *>(b);
+    if (o->memberData)
+        o->memberData->mark(stack);
+    if (o->arrayData) {
+        o->arrayData->setMarkBit();
+        if (o->arrayData->needsMark)
+            ArrayData::markObjects(o->arrayData, stack);
+    }
     uint nInline = o->vtable()->nInlineProperties;
     Value *v = reinterpret_cast<Value *>(o) + o->vtable()->inlinePropertyOffset;
     const Value *end = v + nInline;
@@ -402,14 +451,14 @@ bool Object::hasOwnProperty(uint index) const
     return false;
 }
 
-void Object::construct(const Managed *m, Scope &scope, CallData *)
+ReturnedValue Object::callAsConstructor(const FunctionObject *f, const Value *, int)
 {
-    scope.result = static_cast<const Object *>(m)->engine()->throwTypeError();
+    return f->engine()->throwTypeError();
 }
 
-void Object::call(const Managed *m, Scope &scope, CallData *)
+ReturnedValue Object::call(const FunctionObject *f, const Value *, const Value *, int)
 {
-    scope.result = static_cast<const Object *>(m)->engine()->throwTypeError();
+    return f->engine()->throwTypeError();
 }
 
 ReturnedValue Object::get(const Managed *m, String *name, bool *hasProperty)
@@ -483,9 +532,10 @@ ReturnedValue Object::getLookup(const Managed *m, Lookup *l)
             Q_ASSERT(l->classList[0] == o->internalClass());
             if (l->level == 0) {
                 uint nInline = o->d()->vtable()->nInlineProperties;
-                if (l->index < nInline)
+                if (l->index < nInline) {
+                    l->index += o->d()->vtable()->inlinePropertyOffset;
                     l->getter = Lookup::getter0Inline;
-                else {
+                } else {
                     l->index -= nInline;
                     l->getter = Lookup::getter0MemberData;
                 }
@@ -512,11 +562,11 @@ ReturnedValue Object::getLookup(const Managed *m, Lookup *l)
     return Encode::undefined();
 }
 
-void Object::setLookup(Managed *m, Lookup *l, const Value &value)
+bool Object::setLookup(Managed *m, Lookup *l, const Value &value)
 {
     Scope scope(static_cast<Object *>(m)->engine());
     ScopedObject o(scope, static_cast<Object *>(m));
-    ScopedString name(scope, scope.engine->current->compilationUnit->runtimeStrings[l->nameIndex]);
+    ScopedString name(scope, scope.engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[l->nameIndex]);
 
     InternalClass *c = o->internalClass();
     uint idx = c->find(name);
@@ -526,42 +576,44 @@ void Object::setLookup(Managed *m, Lookup *l, const Value &value)
             l->index = idx;
             l->setter = idx < o->d()->vtable()->nInlineProperties ? Lookup::setter0Inline : Lookup::setter0;
             o->setProperty(idx, value);
-            return;
+            return true;
         }
 
-        if (idx != UINT_MAX) {
-            o->putValue(idx, value);
-            return;
-        }
+        if (idx != UINT_MAX)
+            return o->putValue(idx, value);
     }
 
-    o->put(name, value);
+    if (!o->put(name, value)) {
+        l->setter = Lookup::setterFallback;
+        return false;
+    }
 
     if (o->internalClass() == c)
-        return;
+        return true;
     idx = o->internalClass()->find(name);
-    if (idx == UINT_MAX)
-        return;
+    if (idx == UINT_MAX) // ### can this even happen?
+        return false;
     l->classList[0] = c;
     l->classList[3] = o->internalClass();
     l->index = idx;
     if (!o->prototype()) {
         l->setter = Lookup::setterInsert0;
-        return;
+        return true;
     }
     o = o->prototype();
     l->classList[1] = o->internalClass();
     if (!o->prototype()) {
         l->setter = Lookup::setterInsert1;
-        return;
+        return true;
     }
     o = o->prototype();
     l->classList[2] = o->internalClass();
     if (!o->prototype()) {
         l->setter = Lookup::setterInsert2;
-        return;
+        return true;
     }
     l->setter = Lookup::setterGeneric;
+    return true;
 }
 
 void Object::advanceIterator(Managed *m, ObjectIterator *it, Value *name, uint *index, Property *pd, PropertyAttributes *attrs)
@@ -644,14 +696,13 @@ ReturnedValue Object::internalGet(String *name, bool *hasProperty) const
     name->makeIdentifier();
     Identifier *id = name->identifier();
 
-    Scope scope(engine());
-    ScopedObject o(scope, this);
+    Heap::Object *o = d();
     while (o) {
-        uint idx = o->internalClass()->find(id);
+        uint idx = o->internalClass->find(id);
         if (idx < UINT_MAX) {
             if (hasProperty)
                 *hasProperty = true;
-            return getValue(*o->propertyData(idx), o->internalClass()->propertyData.at(idx));
+            return getValue(*o->propertyData(idx), o->internalClass->propertyData.at(idx));
         }
 
         o = o->prototype();
@@ -725,9 +776,9 @@ bool Object::internalPut(String *name, const Value &value)
         if (attrs.isAccessor()) {
             if (memberIndex->as<FunctionObject>())
                 goto cont;
-            goto reject;
+            return false;
         } else if (!attrs.isWritable())
-            goto reject;
+            return false;
         else if (isArrayObject() && name->equals(engine->id_length())) {
             bool ok;
             uint l = value.asArrayLength(&ok);
@@ -737,14 +788,14 @@ bool Object::internalPut(String *name, const Value &value)
             }
             ok = setArrayLength(l);
             if (!ok)
-                goto reject;
+                return false;
         } else {
             memberIndex.set(engine, value);
         }
         return true;
     } else if (!prototype()) {
         if (!isExtensible())
-            goto reject;
+            return false;
     } else {
         // clause 4
         Scope scope(engine);
@@ -752,12 +803,12 @@ bool Object::internalPut(String *name, const Value &value)
         if (!memberIndex.isNull()) {
             if (attrs.isAccessor()) {
                 if (!memberIndex->as<FunctionObject>())
-                    goto reject;
+                    return false;
             } else if (!isExtensible() || !attrs.isWritable()) {
-                goto reject;
+                return false;
             }
         } else if (!isExtensible()) {
-            goto reject;
+            return false;
         }
     }
 
@@ -769,24 +820,15 @@ bool Object::internalPut(String *name, const Value &value)
 
         Scope scope(engine);
         ScopedFunctionObject setter(scope, *memberIndex);
-        ScopedCallData callData(scope, 1);
-        callData->args[0] = value;
-        callData->thisObject = this;
-        setter->call(scope, callData);
-        return !internalClass()->engine->hasException;
+        JSCallData jsCallData(scope, 1);
+        jsCallData->args[0] = value;
+        *jsCallData->thisObject = this;
+        setter->call(jsCallData);
+        return !engine->hasException;
     }
 
     insertMember(name, value);
     return true;
-
-  reject:
-    // ### this should be removed once everything is ported to use Object::set()
-    if (engine->current->strictMode) {
-        QString message = QLatin1String("Cannot assign to read-only property \"") +
-                name->toQString() + QLatin1Char('\"');
-        engine->throwTypeError(message);
-    }
-    return false;
 }
 
 bool Object::internalPutIndexed(uint index, const Value &value)
@@ -802,7 +844,7 @@ bool Object::internalPutIndexed(uint index, const Value &value)
     if (arrayIndex.isNull() && isStringObject()) {
         if (index < static_cast<StringObject *>(this)->length())
             // not writable
-            goto reject;
+            return false;
     }
 
     // clause 1
@@ -810,15 +852,15 @@ bool Object::internalPutIndexed(uint index, const Value &value)
         if (attrs.isAccessor()) {
             if (arrayIndex->as<FunctionObject>())
                 goto cont;
-            goto reject;
+            return false;
         } else if (!attrs.isWritable())
-            goto reject;
+            return false;
 
         arrayIndex.set(engine, value);
         return true;
     } else if (!prototype()) {
         if (!isExtensible())
-            goto reject;
+            return false;
     } else {
         // clause 4
         Scope scope(engine);
@@ -826,12 +868,12 @@ bool Object::internalPutIndexed(uint index, const Value &value)
         if (!arrayIndex.isNull()) {
             if (attrs.isAccessor()) {
                 if (!arrayIndex->as<FunctionObject>())
-                    goto reject;
+                    return false;
             } else if (!isExtensible() || !attrs.isWritable()) {
-                goto reject;
+                return false;
             }
         } else if (!isExtensible()) {
-            goto reject;
+            return false;
         }
     }
 
@@ -843,21 +885,15 @@ bool Object::internalPutIndexed(uint index, const Value &value)
 
         Scope scope(engine);
         ScopedFunctionObject setter(scope, *arrayIndex);
-        ScopedCallData callData(scope, 1);
-        callData->args[0] = value;
-        callData->thisObject = this;
-        setter->call(scope, callData);
-        return !internalClass()->engine->hasException;
+        JSCallData jsCallData(scope, 1);
+        jsCallData->args[0] = value;
+        *jsCallData->thisObject = this;
+        setter->call(jsCallData);
+        return !engine->hasException;
     }
 
     arraySet(index, value);
     return true;
-
-  reject:
-    // ### this should be removed once everything is ported to use Object::setIndexed()
-    if (engine->current->strictMode)
-        engine->throwTypeError();
-    return false;
 }
 
 // Section 8.12.7
@@ -878,8 +914,6 @@ bool Object::internalDeleteProperty(String *name)
             InternalClass::removeMember(this, name->identifier());
             return true;
         }
-        if (engine()->current->strictMode)
-            engine()->throwTypeError();
         return false;
     }
 
@@ -896,8 +930,6 @@ bool Object::internalDeleteIndexedProperty(uint index)
     if (!ad || ad->vtable()->del(this, index))
         return true;
 
-    if (engine()->current->strictMode)
-        engine()->throwTypeError();
     return false;
 }
 
@@ -921,7 +953,7 @@ bool Object::__defineOwnProperty__(ExecutionEngine *engine, String *name, const
         if (attrs.isEmpty() || p->isSubset(attrs, lp, cattrs))
             return true;
         if (!cattrs.isWritable() || attrs.type() == PropertyAttributes::Accessor || attrs.isConfigurable() || attrs.isEnumerable())
-            goto reject;
+            return false;
         bool succeeded = true;
         if (attrs.type() == PropertyAttributes::Data) {
             bool ok;
@@ -938,7 +970,7 @@ bool Object::__defineOwnProperty__(ExecutionEngine *engine, String *name, const
             InternalClass::changeMember(this, engine->id_length(), cattrs);
         }
         if (!succeeded)
-            goto reject;
+            return false;
         return true;
     }
 
@@ -948,7 +980,7 @@ bool Object::__defineOwnProperty__(ExecutionEngine *engine, String *name, const
     if (memberIndex == UINT_MAX) {
         // clause 3
         if (!isExtensible())
-            goto reject;
+            return false;
         // clause 4
         ScopedProperty pd(scope);
         pd->copy(p, attrs);
@@ -958,26 +990,18 @@ bool Object::__defineOwnProperty__(ExecutionEngine *engine, String *name, const
     }
 
     return __defineOwnProperty__(engine, memberIndex, name, p, attrs);
-reject:
-  if (engine->current->strictMode)
-      engine->throwTypeError();
-  return false;
 }
 
 bool Object::__defineOwnProperty__(ExecutionEngine *engine, uint index, const Property *p, PropertyAttributes attrs)
 {
     // 15.4.5.1, 4b
     if (isArrayObject() && index >= getLength() && !internalClass()->propertyData[Heap::ArrayObject::LengthPropertyIndex].isWritable())
-        goto reject;
+        return false;
 
     if (ArgumentsObject::isNonStrictArgumentsObject(this))
         return static_cast<ArgumentsObject *>(this)->defineOwnProperty(engine, index, p, attrs);
 
     return defineOwnProperty2(engine, index, p, attrs);
-reject:
-  if (engine->current->strictMode)
-      engine->throwTypeError();
-  return false;
 }
 
 bool Object::defineOwnProperty2(ExecutionEngine *engine, uint index, const Property *p, PropertyAttributes attrs)
@@ -994,7 +1018,7 @@ bool Object::defineOwnProperty2(ExecutionEngine *engine, uint index, const Prope
     if (!hasProperty) {
         // clause 3
         if (!isExtensible())
-            goto reject;
+            return false;
         // clause 4
         Scope scope(engine);
         ScopedProperty pp(scope);
@@ -1010,10 +1034,6 @@ bool Object::defineOwnProperty2(ExecutionEngine *engine, uint index, const Prope
     }
 
     return __defineOwnProperty__(engine, index, 0, p, attrs);
-reject:
-  if (engine->current->strictMode)
-      engine->throwTypeError();
-  return false;
 }
 
 bool Object::__defineOwnProperty__(ExecutionEngine *engine, uint index, String *member, const Property *p, PropertyAttributes attrs)
@@ -1040,9 +1060,9 @@ bool Object::__defineOwnProperty__(ExecutionEngine *engine, uint index, String *
     // clause 7
     if (!cattrs.isConfigurable()) {
         if (attrs.isConfigurable())
-            goto reject;
+            return false;
         if (attrs.hasEnumerable() && attrs.isEnumerable() != cattrs.isEnumerable())
-            goto reject;
+            return false;
     }
 
     // clause 8
@@ -1053,7 +1073,7 @@ bool Object::__defineOwnProperty__(ExecutionEngine *engine, uint index, String *
     if (cattrs.isData() != attrs.isData()) {
         // 9a
         if (!cattrs.isConfigurable())
-            goto reject;
+            return false;
         if (cattrs.isData()) {
             // 9b
             cattrs.setType(PropertyAttributes::Accessor);
@@ -1079,15 +1099,15 @@ bool Object::__defineOwnProperty__(ExecutionEngine *engine, uint index, String *
     } else if (cattrs.isData() && attrs.isData()) { // clause 10
         if (!cattrs.isConfigurable() && !cattrs.isWritable()) {
             if (attrs.isWritable() || !current->value.sameValue(p->value))
-                goto reject;
+                return false;
         }
     } else { // clause 10
         Q_ASSERT(cattrs.isAccessor() && attrs.isAccessor());
         if (!cattrs.isConfigurable()) {
             if (!p->value.isEmpty() && current->value.rawValue() != p->value.rawValue())
-                goto reject;
+                return false;
             if (!p->set.isEmpty() && current->set.rawValue() != p->set.rawValue())
-                goto reject;
+                return false;
         }
     }
 
@@ -1102,10 +1122,6 @@ bool Object::__defineOwnProperty__(ExecutionEngine *engine, uint index, String *
         arrayData()->setProperty(scope.engine, index, current);
     }
     return true;
-  reject:
-    if (engine->current->strictMode)
-        engine->throwTypeError();
-    return false;
 }
 
 
@@ -1260,7 +1276,7 @@ void Heap::ArrayObject::init(const QStringList &list)
 ReturnedValue ArrayObject::getLookup(const Managed *m, Lookup *l)
 {
     Scope scope(static_cast<const Object *>(m)->engine());
-    ScopedString name(scope, scope.engine->current->compilationUnit->runtimeStrings[l->nameIndex]);
+    ScopedString name(scope, scope.engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[l->nameIndex]);
     if (name->equals(scope.engine->id_length())) {
         // special case, as the property is on the object itself
         l->getter = Lookup::arrayLengthGetter;
diff --git a/src/qml/jsruntime/qv4object_p.h b/src/qml/jsruntime/qv4object_p.h
index 066a93cc61..ff3ad7c0c6 100644
--- a/src/qml/jsruntime/qv4object_p.h
+++ b/src/qml/jsruntime/qv4object_p.h
@@ -57,6 +57,7 @@
 #include "qv4scopedvalue_p.h"
 #include "qv4value_p.h"
 #include "qv4internalclass_p.h"
+#include "qv4string_p.h"
 
 QT_BEGIN_NAMESPACE
 
@@ -71,11 +72,14 @@ namespace Heap {
     Member(class, Pointer, MemberData *, memberData) \
     Member(class, Pointer, ArrayData *, arrayData)
 
-DECLARE_HEAP_OBJECT(Object, Base) {
-    DECLARE_MARK_TABLE(Object);
+DECLARE_EXPORTED_HEAP_OBJECT(Object, Base) {
+    static void markObjects(Heap::Base *base, MarkStack *stack);
     void init() { Base::init(); }
-    void destroy() { Base::destroy(); }
 
+    const Value *inlinePropertyDataWithOffset(uint indexWithOffset) const {
+        Q_ASSERT(indexWithOffset >= vtable()->inlinePropertyOffset && indexWithOffset < vtable()->inlinePropertyOffset + vtable()->nInlineProperties);
+        return reinterpret_cast<const Value *>(this) + indexWithOffset;
+    }
     const Value *inlinePropertyData(uint index) const {
         Q_ASSERT(index < vtable()->nInlineProperties);
         return reinterpret_cast<const Value *>(this) + vtable()->inlinePropertyOffset + index;
@@ -128,25 +132,8 @@ DECLARE_HEAP_OBJECT(Object, Base) {
     Heap::Object *prototype() const { return internalClass->prototype; }
 };
 
-Q_STATIC_ASSERT(Object::markTable == ((2 << 2) | (2 << 4)));
-
 }
 
-#define V4_OBJECT(superClass) \
-    public: \
-        Q_MANAGED_CHECK \
-        typedef superClass SuperClass; \
-        static const QV4::ObjectVTable static_vtbl; \
-        static inline const QV4::VTable *staticVTable() { return &static_vtbl.vTable; } \
-        V4_MANAGED_SIZE_TEST \
-        Data *d_unchecked() const { return static_cast<Data *>(m()); } \
-        Data *d() const { \
-            Data *dptr = d_unchecked(); \
-            dptr->_checkIsInitialized(); \
-            return dptr; \
-        } \
-        V4_ASSERT_IS_TRIVIAL(Data);
-
 #define V4_OBJECT2(DataClass, superClass) \
     private: \
         DataClass() Q_DECL_EQ_DELETE; \
@@ -164,8 +151,7 @@ Q_STATIC_ASSERT(Object::markTable == ((2 << 2) | (2 << 4)));
             dptr->_checkIsInitialized(); \
             return dptr; \
         } \
-        V4_ASSERT_IS_TRIVIAL(QV4::Heap::DataClass); \
-        static Q_CONSTEXPR quint64 markTable = QV4::Heap::DataClass::markTable;
+        V4_ASSERT_IS_TRIVIAL(QV4::Heap::DataClass);
 
 #define V4_PROTOTYPE(p) \
     static QV4::Object *defaultPrototype(QV4::ExecutionEngine *e) \
@@ -174,8 +160,8 @@ Q_STATIC_ASSERT(Object::markTable == ((2 << 2) | (2 << 4)));
 struct ObjectVTable
 {
     VTable vTable;
-    void (*call)(const Managed *, Scope &scope, CallData *data);
-    void (*construct)(const Managed *, Scope &scope, CallData *data);
+    ReturnedValue (*call)(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    ReturnedValue (*callAsConstructor)(const FunctionObject *, const Value *argv, int argc);
     ReturnedValue (*get)(const Managed *, String *name, bool *hasProperty);
     ReturnedValue (*getIndexed)(const Managed *, uint index, bool *hasProperty);
     bool (*put)(Managed *, String *name, const Value &value);
@@ -185,7 +171,7 @@ struct ObjectVTable
     bool (*deleteProperty)(Managed *m, String *name);
     bool (*deleteIndexedProperty)(Managed *m, uint index);
     ReturnedValue (*getLookup)(const Managed *m, Lookup *l);
-    void (*setLookup)(Managed *m, Lookup *l, const Value &v);
+    bool (*setLookup)(Managed *m, Lookup *l, const Value &v);
     uint (*getLength)(const Managed *m);
     void (*advanceIterator)(Managed *m, ObjectIterator *it, Value *name, uint *index, Property *p, PropertyAttributes *attributes);
     ReturnedValue (*instanceOf)(const Object *typeObject, const Value &var);
@@ -196,7 +182,7 @@ const QV4::ObjectVTable classname::static_vtbl =    \
 {     \
     DEFINE_MANAGED_VTABLE_INT(classname, (std::is_same<classname::SuperClass, Object>::value) ? nullptr : &classname::SuperClass::static_vtbl.vTable), \
     call,                                       \
-    construct,                                  \
+    callAsConstructor,                          \
     get,                                        \
     getIndexed,                                 \
     put,                                        \
@@ -228,6 +214,8 @@ struct Q_QML_EXPORT Object: Managed {
     V4_INTERNALCLASS(Object)
     V4_PROTOTYPE(objectPrototype)
 
+    enum { NInlineProperties = 2 };
+
     enum {
         IsObject = true,
         GetterOffset = 0,
@@ -287,12 +275,20 @@ struct Q_QML_EXPORT Object: Managed {
         insertMember(name, value, Attr_Data|Attr_NotEnumerable);
     }
     void defineDefaultProperty(const QString &name, const Value &value);
-    void defineDefaultProperty(const QString &name, void (*code)(const BuiltinFunction *, Scope &, CallData *), int argumentCount = 0);
-    void defineDefaultProperty(String *name, void (*code)(const BuiltinFunction *, Scope &, CallData *), int argumentCount = 0);
-    void defineAccessorProperty(const QString &name, void (*getter)(const BuiltinFunction *, Scope &, CallData *),
-                                void (*setter)(const BuiltinFunction *, Scope &, CallData *));
-    void defineAccessorProperty(String *name, void (*getter)(const BuiltinFunction *, Scope &, CallData *),
-                                void (*setter)(const BuiltinFunction *, Scope &, CallData *));
+    // old calling convention
+    void defineDefaultProperty(const QString &name, ReturnedValue (*code)(const BuiltinFunction *, CallData *), int argumentCount = 0);
+    void defineDefaultProperty(String *name, ReturnedValue (*code)(const BuiltinFunction *, CallData *), int argumentCount = 0);
+    // new calling convention
+    void defineDefaultProperty(const QString &name, ReturnedValue (*code)(const FunctionObject *, const Value *thisObject, const Value *argv, int argc), int argumentCount = 0);
+    void defineDefaultProperty(String *name, ReturnedValue (*code)(const FunctionObject *, const Value *thisObject, const Value *argv, int argc), int argumentCount = 0);
+    void defineAccessorProperty(const QString &name, ReturnedValue (*getter)(const BuiltinFunction *, CallData *),
+                                ReturnedValue (*setter)(const BuiltinFunction *, CallData *));
+    void defineAccessorProperty(String *name, ReturnedValue (*getter)(const BuiltinFunction *, CallData *),
+                                ReturnedValue (*setter)(const BuiltinFunction *, CallData *));
+    void defineAccessorProperty(const QString &name, ReturnedValue (*getter)(const FunctionObject *, const Value *, const Value *, int),
+                                ReturnedValue (*setter)(const FunctionObject *, const Value *, const Value *, int));
+    void defineAccessorProperty(String *name, ReturnedValue (*getter)(const FunctionObject *, const Value *, const Value *, int),
+                                ReturnedValue (*setter)(const FunctionObject *, const Value *, const Value *, int));
     /* Fixed: Writable: false, Enumerable: false, Configurable: false */
     void defineReadonlyProperty(const QString &name, const Value &value);
     void defineReadonlyProperty(String *name, const Value &value);
@@ -314,6 +310,8 @@ struct Q_QML_EXPORT Object: Managed {
     // Array handling
 
 public:
+    static void markObjects(Heap::Base *base, MarkStack *stack);
+
     void copyArrayData(Object *other);
 
     bool setArrayLength(uint newLen);
@@ -408,19 +406,6 @@ public:
         return ret;
     }
 
-    inline bool setIndexed(uint idx, const Value &v, ThrowOnFailure shouldThrow)
-    {
-        bool ret = vtable()->putIndexed(this, idx, v);
-        if (!ret && shouldThrow == ThrowOnFailure::DoThrowOnRejection) {
-            ExecutionEngine *e = engine();
-            if (!e->hasException) { // allow a custom set impl to throw itself
-                e->throwTypeError();
-            }
-        }
-        return ret;
-    }
-
-
     PropertyAttributes query(String *name) const
     { return vtable()->query(this, name); }
     PropertyAttributes queryIndexed(uint index) const
@@ -431,21 +416,17 @@ public:
     { return vtable()->deleteIndexedProperty(this, index); }
     ReturnedValue getLookup(Lookup *l) const
     { return vtable()->getLookup(this, l); }
-    void setLookup(Lookup *l, const Value &v)
-    { vtable()->setLookup(this, l, v); }
+    bool setLookup(Lookup *l, const Value &v)
+    { return vtable()->setLookup(this, l, v); }
     void advanceIterator(ObjectIterator *it, Value *name, uint *index, Property *p, PropertyAttributes *attributes)
     { vtable()->advanceIterator(this, it, name, index, p, attributes); }
     uint getLength() const { return vtable()->getLength(this); }
     ReturnedValue instanceOf(const Value &var) const
     { return vtable()->instanceOf(this, var); }
 
-    inline void construct(Scope &scope, CallData *d) const
-    { return vtable()->construct(this, scope, d); }
-    inline void call(Scope &scope, CallData *d) const
-    { vtable()->call(this, scope, d); }
 protected:
-    static void construct(const Managed *m, Scope &scope, CallData *);
-    static void call(const Managed *m, Scope &scope, CallData *);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
     static ReturnedValue get(const Managed *m, String *name, bool *hasProperty);
     static ReturnedValue getIndexed(const Managed *m, uint index, bool *hasProperty);
     static bool put(Managed *m, String *name, const Value &value);
@@ -455,11 +436,10 @@ protected:
     static bool deleteProperty(Managed *m, String *name);
     static bool deleteIndexedProperty(Managed *m, uint index);
     static ReturnedValue getLookup(const Managed *m, Lookup *l);
-    static void setLookup(Managed *m, Lookup *l, const Value &v);
+    static bool setLookup(Managed *m, Lookup *l, const Value &v);
     static void advanceIterator(Managed *m, ObjectIterator *it, Value *name, uint *index, Property *p, PropertyAttributes *attributes);
     static uint getLength(const Managed *m);
     static ReturnedValue instanceOf(const Object *typeObject, const Value &var);
-    static void markObjects(Heap::Base *, MarkStack *);
 
 private:
     ReturnedValue internalGet(String *name, bool *hasProperty) const;
diff --git a/src/qml/jsruntime/qv4objectiterator.cpp b/src/qml/jsruntime/qv4objectiterator.cpp
index 3427ee89fe..0394c704f9 100644
--- a/src/qml/jsruntime/qv4objectiterator.cpp
+++ b/src/qml/jsruntime/qv4objectiterator.cpp
@@ -177,9 +177,9 @@ ReturnedValue ObjectIterator::nextPropertyNameAsString()
 
 DEFINE_OBJECT_VTABLE(ForEachIteratorObject);
 
-void ForEachIteratorObject::markObjects(Heap::Base *that, MarkStack *markStack)
+void Heap::ForEachIteratorObject::markObjects(Heap::Base *that, MarkStack *markStack)
 {
-    ForEachIteratorObject::Data *o = static_cast<ForEachIteratorObject::Data *>(that);
+    ForEachIteratorObject *o = static_cast<ForEachIteratorObject *>(that);
     o->workArea[0].mark(markStack);
     o->workArea[1].mark(markStack);
     Object::markObjects(that, markStack);
diff --git a/src/qml/jsruntime/qv4objectiterator_p.h b/src/qml/jsruntime/qv4objectiterator_p.h
index 6168d59914..30a6ad3025 100644
--- a/src/qml/jsruntime/qv4objectiterator_p.h
+++ b/src/qml/jsruntime/qv4objectiterator_p.h
@@ -116,6 +116,7 @@ struct ForEachIteratorObject : Object {
     ObjectIterator &it() { return *reinterpret_cast<ObjectIterator*>(&itData); }
     Value workArea[2];
 
+    static void markObjects(Heap::Base *that, MarkStack *markStack);
 private:
     ObjectIteratorData itData;
 };
@@ -127,9 +128,6 @@ struct ForEachIteratorObject: Object {
     Q_MANAGED_TYPE(ForeachIteratorObject)
 
     ReturnedValue nextPropertyName() { return d()->it().nextPropertyNameAsString(); }
-
-protected:
-    static void markObjects(Heap::Base *that, MarkStack *markStack);
 };
 
 inline
diff --git a/src/qml/jsruntime/qv4objectproto.cpp b/src/qml/jsruntime/qv4objectproto.cpp
index 2e72c0f13f..5eef757ce9 100644
--- a/src/qml/jsruntime/qv4objectproto.cpp
+++ b/src/qml/jsruntime/qv4objectproto.cpp
@@ -46,6 +46,7 @@
 #include "qv4runtime_p.h"
 #include "qv4objectiterator_p.h"
 #include "qv4string_p.h"
+#include "qv4jscall_p.h"
 
 #include <QtCore/QDateTime>
 #include <QtCore/QStringList>
@@ -60,27 +61,29 @@ void Heap::ObjectCtor::init(QV4::ExecutionContext *scope)
     Heap::FunctionObject::init(scope, QStringLiteral("Object"));
 }
 
-void ObjectCtor::construct(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue ObjectCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    const ObjectCtor *ctor = static_cast<const ObjectCtor *>(that);
-    if (!callData->argc || callData->args[0].isUndefined() || callData->args[0].isNull()) {
+    ExecutionEngine *v4 = f->engine();
+    const ObjectCtor *ctor = static_cast<const ObjectCtor *>(f);
+    if (!argc || argv[0].isUndefined() || argv[0].isNull()) {
+        Scope scope(v4);
         ScopedObject obj(scope, scope.engine->newObject());
         ScopedObject proto(scope, ctor->get(scope.engine->id_prototype()));
         if (!!proto)
             obj->setPrototype(proto);
-        scope.result = obj.asReturnedValue();
+        return obj.asReturnedValue();
     } else {
-        scope.result = callData->args[0].toObject(scope.engine);
+        return argv[0].toObject(v4)->asReturnedValue();
     }
 }
 
-void ObjectCtor::call(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue ObjectCtor::call(const FunctionObject *m, const Value *, const Value *argv, int argc)
 {
-    ExecutionEngine *v4 = scope.engine;
-    if (!callData->argc || callData->args[0].isUndefined() || callData->args[0].isNull()) {
-        scope.result = v4->newObject()->asReturnedValue();
+    ExecutionEngine *v4 = m->engine();
+    if (!argc || argv[0].isUndefined() || argv[0].isNull()) {
+        return v4->newObject()->asReturnedValue();
     } else {
-        scope.result = callData->args[0].toObject(v4);
+        return argv[0].toObject(v4)->asReturnedValue();
     }
 }
 
@@ -123,58 +126,78 @@ void ObjectPrototype::init(ExecutionEngine *v4, Object *ctor)
     insertMember(v4->id___proto__(), p, Attr_Accessor|Attr_NotEnumerable);
 }
 
-void ObjectPrototype::method_getPrototypeOf(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_getPrototypeOf(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->args[0].toObject(scope.engine));
-    CHECK_EXCEPTION();
+    Scope scope(b);
+    if (argc < 1)
+        return scope.engine->throwTypeError();
+
+    ScopedObject o(scope, argv[0].toObject(scope.engine));
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
     ScopedObject p(scope, o->prototype());
-    scope.result = !!p ? p->asReturnedValue() : Encode::null();
+    return (!!p ? p->asReturnedValue() : Encode::null());
 }
 
-void ObjectPrototype::method_getOwnPropertyDescriptor(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_getOwnPropertyDescriptor(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject O(scope, callData->args[0].toObject(scope.engine));
-    CHECK_EXCEPTION();
+    Scope scope(b);
+    if (argc < 1)
+        return scope.engine->throwTypeError();
+
+    ScopedObject O(scope, argv[0].toObject(scope.engine));
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
     if (ArgumentsObject::isNonStrictArgumentsObject(O))
         static_cast<ArgumentsObject *>(O.getPointer())->fullyCreate();
 
-    ScopedValue v(scope, callData->argument(1));
+    ScopedValue v(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
     ScopedString name(scope, v->toString(scope.engine));
-    CHECK_EXCEPTION();
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
     PropertyAttributes attrs;
     ScopedProperty desc(scope);
     O->getOwnProperty(name, &attrs, desc);
-    scope.result = fromPropertyDescriptor(scope.engine, desc, attrs);
+    return fromPropertyDescriptor(scope.engine, desc, attrs);
 }
 
-void ObjectPrototype::method_getOwnPropertyNames(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_getOwnPropertyNames(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject O(scope, callData->args[0].toObject(scope.engine));
-    CHECK_EXCEPTION();
+    Scope scope(b);
+    if (argc < 1)
+        return scope.engine->throwTypeError();
+
+    ScopedObject O(scope, argv[0].toObject(scope.engine));
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
-    scope.result = getOwnPropertyNames(scope.engine, callData->args[0]);
+    return Encode(getOwnPropertyNames(scope.engine, argv[0]));
 }
 
 // 19.1.2.1
-void ObjectPrototype::method_assign(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_assign(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject to(scope, callData->args[0].toObject(scope.engine));
-    CHECK_EXCEPTION();
+    Scope scope(b);
+    if (argc < 1)
+        return scope.engine->throwTypeError();
 
-    if (callData->argc == 1) {
-        scope.result = to;
-        return;
-    }
+    ScopedObject to(scope, argv[0].toObject(scope.engine));
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
-    for (int i = 1; i < callData->argc; ++i) {
-        if (callData->args[i].isUndefined() || callData->args[i].isNull())
+    if (argc == 1)
+        return to.asReturnedValue();
+
+    for (int i = 1, ei = argc; i < ei; ++i) {
+        if (argv[i].isUndefined() || argv[i].isNull())
             continue;
 
-        ScopedObject from(scope, callData->args[i].toObject(scope.engine));
-        CHECK_EXCEPTION();
+        ScopedObject from(scope, argv[i].toObject(scope.engine));
+        if (scope.engine->hasException)
+        return QV4::Encode::undefined();
         QV4::ScopedArrayObject keys(scope, QV4::ObjectPrototype::getOwnPropertyNames(scope.engine, from));
         quint32 length = keys->getLength();
 
@@ -195,64 +218,71 @@ void ObjectPrototype::method_assign(const BuiltinFunction *, Scope &scope, CallD
 
             propValue = from->get(nextKey);
             to->set(nextKey, propValue, Object::DoThrowOnRejection);
-            CHECK_EXCEPTION();
+            if (scope.engine->hasException)
+        return QV4::Encode::undefined();
         }
     }
 
-    scope.result = to;
+    return to.asReturnedValue();
 }
 
-void ObjectPrototype::method_create(const BuiltinFunction *builtin, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_create(const FunctionObject *builtin, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedValue O(scope, callData->argument(0));
-    if (!O->isObject() && !O->isNull()) {
-        scope.result = scope.engine->throwTypeError();
-        return;
-    }
+    Scope scope(builtin);
+    if (!argc || (!argv[0].isObject() && !argv[0].isNull()))
+        return scope.engine->throwTypeError();
+
+    ScopedObject O(scope, argv[0]);
 
     ScopedObject newObject(scope, scope.engine->newObject());
-    newObject->setPrototype(O->as<Object>());
+    newObject->setPrototype(O);
 
-    if (callData->argc > 1 && !callData->args[1].isUndefined()) {
-        callData->args[0] = newObject;
-        method_defineProperties(builtin, scope, callData);
-        return;
+
+    if (argc > 1 && !argv[1].isUndefined()) {
+        Value *arguments = scope.alloc(argc);
+        arguments[0] = newObject;
+        memcpy(arguments + 1, argv + 1, (argc - 1)*sizeof(Value));
+        return method_defineProperties(builtin, thisObject, arguments, argc);
     }
 
-    scope.result = newObject;
+    return newObject.asReturnedValue();
 }
 
-void ObjectPrototype::method_defineProperty(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_defineProperty(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject O(scope, callData->argument(0));
-    if (!O) {
-        scope.result = scope.engine->throwTypeError();
-        return;
-    }
+    Scope scope(b);
+    if (!argc || !argv[0].isObject())
+        return scope.engine->throwTypeError();
 
-    ScopedString name(scope, callData->argument(1), ScopedString::Convert);
-    CHECK_EXCEPTION();
+    ScopedObject O(scope, argv[0]);
+    ScopedString name(scope, argc > 1 ? argv[1] : Primitive::undefinedValue(), ScopedString::Convert);
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
-    ScopedValue attributes(scope, callData->argument(2));
+    ScopedValue attributes(scope, argc > 2 ? argv[2] : Primitive::undefinedValue());
     ScopedProperty pd(scope);
     PropertyAttributes attrs;
     toPropertyDescriptor(scope.engine, attributes, pd, &attrs);
-    CHECK_EXCEPTION();
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
     if (!O->__defineOwnProperty__(scope.engine, name, pd, attrs))
         THROW_TYPE_ERROR();
 
-    scope.result = O;
+    return O.asReturnedValue();
 }
 
-void ObjectPrototype::method_defineProperties(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_defineProperties(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject O(scope, callData->argument(0));
-    if (!O)
-        THROW_TYPE_ERROR();
+    Scope scope(b);
+    if (argc < 2 || !argv[0].isObject())
+        return scope.engine->throwTypeError();
+
+    ScopedObject O(scope, argv[0]);
 
-    ScopedObject o(scope, callData->argument(1), ScopedObject::Convert);
-    CHECK_EXCEPTION();
+    ScopedObject o(scope, argv[1].toObject(scope.engine));
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
     ScopedValue val(scope);
 
@@ -269,7 +299,8 @@ void ObjectPrototype::method_defineProperties(const BuiltinFunction *, Scope &sc
         PropertyAttributes nattrs;
         val = o->getValue(pd->value, attrs);
         toPropertyDescriptor(scope.engine, val, n, &nattrs);
-        CHECK_EXCEPTION();
+        if (scope.engine->hasException)
+        return QV4::Encode::undefined();
         bool ok;
         if (name)
             ok = O->__defineOwnProperty__(scope.engine, name, n, nattrs);
@@ -279,18 +310,18 @@ void ObjectPrototype::method_defineProperties(const BuiltinFunction *, Scope &sc
             THROW_TYPE_ERROR();
     }
 
-    scope.result = O;
+    return O.asReturnedValue();
 }
 
-void ObjectPrototype::method_seal(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_seal(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->argument(0));
-    if (!o) {
+    const Value a = argc ? argv[0] : Primitive::undefinedValue();
+    if (!a.isObject())
         // 19.1.2.17, 1
-        scope.result = callData->argument(0);
-        return;
-    }
+        return a.asReturnedValue();
 
+    Scope scope(b);
+    ScopedObject o(scope, a);
     o->setInternalClass(o->internalClass()->sealed());
 
     if (o->arrayData()) {
@@ -301,17 +332,18 @@ void ObjectPrototype::method_seal(const BuiltinFunction *, Scope &scope, CallDat
         }
     }
 
-    scope.result = o;
+    return o.asReturnedValue();
 }
 
-void ObjectPrototype::method_freeze(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_freeze(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->argument(0));
-    if (!o) {
+    const Value a = argc ? argv[0] : Primitive::undefinedValue();
+    if (!a.isObject())
         // 19.1.2.5, 1
-        scope.result = callData->argument(0);
-        return;
-    }
+        return a.asReturnedValue();
+
+    Scope scope(b);
+    ScopedObject o(scope, a);
 
     if (ArgumentsObject::isNonStrictArgumentsObject(o))
         static_cast<ArgumentsObject *>(o.getPointer())->fullyCreate();
@@ -327,116 +359,109 @@ void ObjectPrototype::method_freeze(const BuiltinFunction *, Scope &scope, CallD
                 o->arrayData()->attrs[i].setWritable(false);
         }
     }
-    scope.result = o;
+    return o.asReturnedValue();
 }
 
-void ObjectPrototype::method_preventExtensions(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_preventExtensions(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->args[0].toObject(scope.engine));
-    if (!o) {
-        scope.result = callData->argument(0);
-        return;
-    }
+    Scope scope(b);
+    if (!argc)
+        return scope.engine->throwTypeError();
+
+    ScopedObject o(scope, argv[0].toObject(scope.engine));
+    if (!o)
+        return argv[0].asReturnedValue();
 
     o->setInternalClass(o->internalClass()->nonExtensible());
-    scope.result = o;
+    return o.asReturnedValue();
 }
 
-void ObjectPrototype::method_isSealed(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_isSealed(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->args[0].toObject(scope.engine));
-    if (!o) {
-        scope.result = Encode(true);
-        return;
-    }
+    Scope scope(b);
+    if (!argc)
+        return scope.engine->throwTypeError();
 
-    if (o->isExtensible()) {
-        scope.result = Encode(false);
-        return;
-    }
+    ScopedObject o(scope, argv[0].toObject(scope.engine));
+    if (!o)
+        return Encode(true);
 
-    if (o->internalClass() != o->internalClass()->sealed()) {
-        scope.result = Encode(false);
-        return;
-    }
+    if (o->isExtensible())
+        return  Encode(false);
 
-    if (!o->arrayData() || !o->arrayData()->length()) {
-        scope.result = Encode(true);
-        return;
-    }
+    if (o->internalClass() != o->internalClass()->sealed())
+        return Encode(false);
+
+    if (!o->arrayData() || !o->arrayData()->length())
+        return Encode(true);
 
     Q_ASSERT(o->arrayData() && o->arrayData()->length());
-    if (!o->arrayData()->attrs) {
-        scope.result = Encode(false);
-        return;
-    }
+    if (!o->arrayData()->attrs)
+        return Encode(false);
 
     for (uint i = 0; i < o->arrayData()->values.alloc; ++i) {
         if (!o->arrayData()->isEmpty(i))
-            if (o->arrayData()->attributes(i).isConfigurable()) {
-                scope.result = Encode(false);
-                return;
-            }
+            if (o->arrayData()->attributes(i).isConfigurable())
+                return Encode(false);
     }
 
-    scope.result = Encode(true);
+    return Encode(true);
 }
 
-void ObjectPrototype::method_isFrozen(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_isFrozen(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->args[0].toObject(scope.engine));
-    if (!o) {
-        scope.result = Encode(true);
-        return;
-    }
+    Scope scope(b);
+    if (!argc)
+        return scope.engine->throwTypeError();
 
-    if (o->isExtensible()) {
-        scope.result = Encode(false);
-        return;
-    }
+    ScopedObject o(scope, argv[0].toObject(scope.engine));
+    if (!o)
+        return Encode(true);
 
-    if (o->internalClass() != o->internalClass()->frozen()) {
-        scope.result = Encode(false);
-        return;
-    }
+    if (o->isExtensible())
+        return Encode(false);
 
-    if (!o->arrayData() || !o->arrayData()->length()) {
-        scope.result = Encode(true);
-        return;
-    }
+    if (o->internalClass() != o->internalClass()->frozen())
+        return Encode(false);
+
+    if (!o->arrayData() || !o->arrayData()->length())
+        return Encode(true);
 
     Q_ASSERT(o->arrayData() && o->arrayData()->length());
-    if (!o->arrayData()->attrs) {
-        scope.result = Encode(false);
-        return;
-    }
+    if (!o->arrayData()->attrs)
+        return Encode(false);
 
     for (uint i = 0; i < o->arrayData()->values.alloc; ++i) {
         if (!o->arrayData()->isEmpty(i))
-            if (o->arrayData()->attributes(i).isConfigurable() || o->arrayData()->attributes(i).isWritable()) {
-                scope.result = Encode(false);
-                return;
-            }
+            if (o->arrayData()->attributes(i).isConfigurable() || o->arrayData()->attributes(i).isWritable())
+                return Encode(false);
     }
 
-    scope.result = Encode(true);
+    return Encode(true);
 }
 
-void ObjectPrototype::method_isExtensible(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_isExtensible(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->args[0].toObject(scope.engine));
-    if (!o) {
-        scope.result = Encode(false);
-        return;
-    }
+    Scope scope(b);
+    if (!argc)
+        return scope.engine->throwTypeError();
 
-    scope.result = Encode((bool)o->isExtensible());
+    ScopedObject o(scope, argv[0].toObject(scope.engine));
+    if (!o)
+        return Encode(false);
+
+    return Encode((bool)o->isExtensible());
 }
 
-void ObjectPrototype::method_keys(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_keys(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->args[0].toObject(scope.engine));
-    CHECK_EXCEPTION();
+    Scope scope(b);
+    if (!argc)
+        return scope.engine->throwTypeError();
+
+    ScopedObject o(scope, argv[0].toObject(scope.engine));
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
     ScopedArrayObject a(scope, scope.engine->newArrayObject());
 
@@ -449,101 +474,109 @@ void ObjectPrototype::method_keys(const BuiltinFunction *, Scope &scope, CallDat
         a->push_back(name);
     }
 
-    scope.result = a;
+    return a.asReturnedValue();
 }
 
-void ObjectPrototype::method_toString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    if (callData->thisObject.isUndefined()) {
-        scope.result = scope.engine->newString(QStringLiteral("[object Undefined]"));
-    } else if (callData->thisObject.isNull()) {
-        scope.result = scope.engine->newString(QStringLiteral("[object Null]"));
+    ExecutionEngine *v4 = b->engine();
+    if (thisObject->isUndefined()) {
+        return Encode(v4->newString(QStringLiteral("[object Undefined]")));
+    } else if (thisObject->isNull()) {
+        return Encode(v4->newString(QStringLiteral("[object Null]")));
     } else {
-        ScopedObject obj(scope, callData->thisObject.toObject(scope.engine));
+        Scope scope(v4);
+        ScopedObject obj(scope, thisObject->toObject(scope.engine));
         QString className = obj->className();
-        scope.result = scope.engine->newString(QStringLiteral("[object %1]").arg(className));
+        return Encode(v4->newString(QStringLiteral("[object %1]").arg(className)));
     }
 }
 
-void ObjectPrototype::method_toLocaleString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_toLocaleString(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->thisObject.toObject(scope.engine));
+    Scope scope(b);
+    ScopedObject o(scope, thisObject->toObject(scope.engine));
     if (!o)
         RETURN_UNDEFINED();
 
     ScopedFunctionObject f(scope, o->get(scope.engine->id_toString()));
     if (!f)
         THROW_TYPE_ERROR();
-    ScopedCallData cData(scope);
-    cData->thisObject = o;
-    f->call(scope, callData);
+
+    return f->call(thisObject, argv, argc);
 }
 
-void ObjectPrototype::method_valueOf(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_valueOf(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    scope.result = callData->thisObject.toObject(scope.engine);
+    return Encode(thisObject->toObject(b->engine()));
 }
 
-void ObjectPrototype::method_hasOwnProperty(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_hasOwnProperty(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedString P(scope, callData->argument(0), ScopedString::Convert);
-    CHECK_EXCEPTION();
-    ScopedObject O(scope, callData->thisObject, ScopedObject::Convert);
-    CHECK_EXCEPTION();
+    Scope scope(b);
+    ScopedString P(scope, argc ? argv[0] : Primitive::undefinedValue(), ScopedString::Convert);
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
+    ScopedObject O(scope, thisObject->toObject(scope.engine));
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
     bool r = O->hasOwnProperty(P);
     if (!r)
         r = !O->query(P).isEmpty();
-    scope.result = Encode(r);
+    return Encode(r);
 }
 
-void ObjectPrototype::method_isPrototypeOf(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_isPrototypeOf(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject V(scope, callData->argument(0));
-    if (!V) {
-        scope.result = Encode(false);
-        return;
-    }
-
-    ScopedObject O(scope, callData->thisObject, ScopedObject::Convert);
-    CHECK_EXCEPTION();
+    Scope scope(b);
+    if (!argc || !argv[0].isObject())
+        return Encode(false);
+
+    ScopedObject V(scope, argv[0]);
+    ScopedObject O(scope, thisObject->toObject(scope.engine));
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
     ScopedObject proto(scope, V->prototype());
     while (proto) {
-        if (O->d() == proto->d()) {
-            scope.result = Encode(true);
-            return;
-        }
+        if (O->d() == proto->d())
+            return Encode(true);
         proto = proto->prototype();
     }
-    scope.result = Encode(false);
+    return Encode(false);
 }
 
-void ObjectPrototype::method_propertyIsEnumerable(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_propertyIsEnumerable(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedString p(scope, callData->argument(0), ScopedString::Convert);
-    CHECK_EXCEPTION();
-
-    ScopedObject o(scope, callData->thisObject, ScopedObject::Convert);
-    CHECK_EXCEPTION();
+    Scope scope(b);
+    ScopedString p(scope, argc ? argv[0] : Primitive::undefinedValue(), ScopedString::Convert);
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
+
+    ScopedObject o(scope, thisObject->toObject(scope.engine));
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
     PropertyAttributes attrs;
     o->getOwnProperty(p, &attrs);
-    scope.result = Encode(attrs.isEnumerable());
+    return Encode(attrs.isEnumerable());
 }
 
-void ObjectPrototype::method_defineGetter(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_defineGetter(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    if (callData->argc < 2)
+    Scope scope(b);
+    if (argc < 2)
         THROW_TYPE_ERROR();
 
-    ScopedFunctionObject f(scope, callData->argument(1));
+    ScopedFunctionObject f(scope, argv[1]);
     if (!f)
         THROW_TYPE_ERROR();
 
-    ScopedString prop(scope, callData->argument(0), ScopedString::Convert);
-    CHECK_EXCEPTION();
+    ScopedString prop(scope, argv[0], ScopedString::Convert);
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
-    ScopedObject o(scope, callData->thisObject);
+    ScopedObject o(scope, thisObject);
     if (!o) {
-        if (!callData->thisObject.isUndefined())
+        if (!thisObject->isUndefined())
             RETURN_UNDEFINED();
         o = scope.engine->globalObject;
     }
@@ -551,25 +584,29 @@ void ObjectPrototype::method_defineGetter(const BuiltinFunction *, Scope &scope,
     ScopedProperty pd(scope);
     pd->value = f;
     pd->set = Primitive::emptyValue();
-    o->__defineOwnProperty__(scope.engine, prop, pd, Attr_Accessor);
+    bool ok = o->__defineOwnProperty__(scope.engine, prop, pd, Attr_Accessor);
+    if (!ok)
+        THROW_TYPE_ERROR();
     RETURN_UNDEFINED();
 }
 
-void ObjectPrototype::method_defineSetter(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_defineSetter(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    if (callData->argc < 2)
+    Scope scope(b);
+    if (argc < 2)
         THROW_TYPE_ERROR();
 
-    ScopedFunctionObject f(scope, callData->argument(1));
+    ScopedFunctionObject f(scope, argv[1]);
     if (!f)
         THROW_TYPE_ERROR();
 
-    ScopedString prop(scope, callData->argument(0), ScopedString::Convert);
-    CHECK_EXCEPTION();
+    ScopedString prop(scope, argv[0], ScopedString::Convert);
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
-    ScopedObject o(scope, callData->thisObject);
+    ScopedObject o(scope, thisObject);
     if (!o) {
-        if (!callData->thisObject.isUndefined())
+        if (!thisObject->isUndefined())
             RETURN_UNDEFINED();
         o = scope.engine->globalObject;
     }
@@ -577,31 +614,35 @@ void ObjectPrototype::method_defineSetter(const BuiltinFunction *, Scope &scope,
     ScopedProperty pd(scope);
     pd->value = Primitive::emptyValue();
     pd->set = f;
-    o->__defineOwnProperty__(scope.engine, prop, pd, Attr_Accessor);
+    bool ok = o->__defineOwnProperty__(scope.engine, prop, pd, Attr_Accessor);
+    if (!ok)
+        THROW_TYPE_ERROR();
     RETURN_UNDEFINED();
 }
 
-void ObjectPrototype::method_get_proto(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_get_proto(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    ScopedObject o(scope, callData->thisObject.as<Object>());
+    Scope scope(b);
+    ScopedObject o(scope, thisObject->as<Object>());
     if (!o)
         THROW_TYPE_ERROR();
 
-    scope.result = o->prototype();
+    return Encode(o->prototype());
 }
 
-void ObjectPrototype::method_set_proto(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ObjectPrototype::method_set_proto(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    ScopedObject o(scope, callData->thisObject);
-    if (!o || !callData->argc)
+    Scope scope(b);
+    ScopedObject o(scope, thisObject);
+    if (!o || !argc)
         THROW_TYPE_ERROR();
 
-    if (callData->args[0].isNull()) {
+    if (argv[0].isNull()) {
         o->setPrototype(0);
         RETURN_UNDEFINED();
     }
 
-    ScopedObject p(scope, callData->args[0]);
+    ScopedObject p(scope, argv[0]);
     bool ok = false;
     if (!!p) {
         if (o->prototype() == p->d()) {
@@ -610,10 +651,8 @@ void ObjectPrototype::method_set_proto(const BuiltinFunction *, Scope &scope, Ca
             ok = o->setPrototype(p);
         }
     }
-    if (!ok) {
-        scope.result = scope.engine->throwTypeError(QStringLiteral("Cyclic __proto__ value"));
-        return;
-    }
+    if (!ok)
+        return scope.engine->throwTypeError(QStringLiteral("Cyclic __proto__ value"));
     RETURN_UNDEFINED();
 }
 
diff --git a/src/qml/jsruntime/qv4objectproto_p.h b/src/qml/jsruntime/qv4objectproto_p.h
index 44b54267f3..2b231d46ad 100644
--- a/src/qml/jsruntime/qv4objectproto_p.h
+++ b/src/qml/jsruntime/qv4objectproto_p.h
@@ -70,41 +70,41 @@ struct ObjectCtor: FunctionObject
 {
     V4_OBJECT2(ObjectCtor, FunctionObject)
 
-    static void construct(const Managed *that, Scope &scope, CallData *callData);
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *m, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct ObjectPrototype: Object
 {
     void init(ExecutionEngine *engine, Object *ctor);
 
-    static void method_getPrototypeOf(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getOwnPropertyDescriptor(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_getOwnPropertyNames(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_assign(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_create(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_defineProperty(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_defineProperties(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_seal(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_freeze(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_preventExtensions(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_isSealed(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_isFrozen(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_isExtensible(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_keys(const BuiltinFunction *, Scope &scope, CallData *callData);
-
-    static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toLocaleString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_valueOf(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_hasOwnProperty(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_isPrototypeOf(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_propertyIsEnumerable(const BuiltinFunction *, Scope &scope, CallData *callData);
-
-    static void method_defineGetter(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_defineSetter(const BuiltinFunction *, Scope &scope, CallData *callData);
-
-    static void method_get_proto(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_set_proto(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_getPrototypeOf(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getOwnPropertyDescriptor(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_getOwnPropertyNames(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_assign(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_create(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_defineProperty(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_defineProperties(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_seal(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_freeze(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_preventExtensions(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_isSealed(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_isFrozen(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_isExtensible(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_keys(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+
+    static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toLocaleString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_valueOf(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_hasOwnProperty(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_isPrototypeOf(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_propertyIsEnumerable(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+
+    static ReturnedValue method_defineGetter(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_defineSetter(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+
+    static ReturnedValue method_get_proto(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_set_proto(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 
     static void toPropertyDescriptor(ExecutionEngine *engine, const Value &v, Property *desc, PropertyAttributes *attrs);
     static ReturnedValue fromPropertyDescriptor(ExecutionEngine *engine, const Property *desc, PropertyAttributes attrs);
diff --git a/src/qml/jsruntime/qv4profiling_p.h b/src/qml/jsruntime/qv4profiling_p.h
index 6b2369e795..8a24c71815 100644
--- a/src/qml/jsruntime/qv4profiling_p.h
+++ b/src/qml/jsruntime/qv4profiling_p.h
@@ -59,9 +59,6 @@
 
 #if !QT_CONFIG(qml_debug)
 
-#define Q_V4_PROFILE_ALLOC(engine, size, type) (!engine)
-#define Q_V4_PROFILE_DEALLOC(engine, size, type) (!engine)
-#define Q_V4_PROFILE(engine, function) (function->code(engine, function->codeData))
 
 QT_BEGIN_NAMESPACE
 
@@ -75,22 +72,6 @@ QT_END_NAMESPACE
 
 #else
 
-#define Q_V4_PROFILE_ALLOC(engine, size, type)\
-    (engine->profiler() &&\
-            (engine->profiler()->featuresEnabled & (1 << Profiling::FeatureMemoryAllocation)) ?\
-        engine->profiler()->trackAlloc(size, type) : false)
-
-#define Q_V4_PROFILE_DEALLOC(engine, size, type) \
-    (engine->profiler() &&\
-            (engine->profiler()->featuresEnabled & (1 << Profiling::FeatureMemoryAllocation)) ?\
-        engine->profiler()->trackDealloc(size, type) : false)
-
-#define Q_V4_PROFILE(engine, function)\
-    (Q_UNLIKELY(engine->profiler()) &&\
-            (engine->profiler()->featuresEnabled & (1 << Profiling::FeatureFunctionCall)) ?\
-        Profiling::FunctionCallProfiler::profileCall(engine->profiler(), engine, function) :\
-        function->code(engine, function->codeData))
-
 QT_BEGIN_NAMESPACE
 
 namespace QV4 {
@@ -270,19 +251,21 @@ public:
 
     // It's enough to ref() the function in the destructor as it will probably not disappear while
     // it's executing ...
-    FunctionCallProfiler(Profiler *profiler, Function *function) :
-        profiler(profiler), function(function), startTime(profiler->m_timer.nsecsElapsed())
-    {}
-
-    ~FunctionCallProfiler()
+    FunctionCallProfiler(ExecutionEngine *engine, Function *f)
+        : profiler(0)
     {
-        profiler->m_data.append(FunctionCall(function, startTime, profiler->m_timer.nsecsElapsed()));
+        Profiler *p = engine->profiler();
+        if (Q_UNLIKELY(p) && (p->featuresEnabled & (1 << Profiling::FeatureFunctionCall))) {
+            profiler = p;
+            function = f;
+            startTime = profiler->m_timer.nsecsElapsed();
+        }
     }
 
-    static ReturnedValue profileCall(Profiler *profiler, ExecutionEngine *engine, Function *function)
+    ~FunctionCallProfiler()
     {
-        FunctionCallProfiler callProfiler(profiler, function);
-        return function->code(engine, function->codeData);
+        if (profiler)
+            profiler->m_data.append(FunctionCall(function, startTime, profiler->m_timer.nsecsElapsed()));
     }
 
     Profiler *profiler;
diff --git a/src/qml/jsruntime/qv4qmlcontext.cpp b/src/qml/jsruntime/qv4qmlcontext.cpp
index 8b9ef149d6..5a165b2309 100644
--- a/src/qml/jsruntime/qv4qmlcontext.cpp
+++ b/src/qml/jsruntime/qv4qmlcontext.cpp
@@ -296,13 +296,8 @@ void Heap::QmlContext::init(QV4::ExecutionContext *outerContext, QV4::QQmlContex
 {
     Heap::ExecutionContext::init(Heap::ExecutionContext::Type_QmlContext);
     outer.set(internalClass->engine, outerContext->d());
-    strictMode = false;
-    callData = outer->callData;
-    lookups = outer->lookups;
-    constantTable = outer->constantTable;
-    compilationUnit = outer->compilationUnit;
 
-    this->qml.set(internalClass->engine, qml->d());
+    this->activation.set(internalClass->engine, qml->d());
 }
 
 Heap::QmlContext *QmlContext::createWorkerContext(ExecutionContext *parent, const QUrl &source, Value *sendFunction)
diff --git a/src/qml/jsruntime/qv4qmlcontext_p.h b/src/qml/jsruntime/qv4qmlcontext_p.h
index 48c9ee2c36..a1df5cb95f 100644
--- a/src/qml/jsruntime/qv4qmlcontext_p.h
+++ b/src/qml/jsruntime/qv4qmlcontext_p.h
@@ -76,12 +76,12 @@ struct QQmlContextWrapper : Object {
     QQmlQPointer<QObject> scopeObject;
 };
 
-#define QmlContextMembers(class, Member) \
-    Member(class, Pointer, QQmlContextWrapper *, qml)
+#define QmlContextMembers(class, Member)
 
 DECLARE_HEAP_OBJECT(QmlContext, ExecutionContext) {
-    DECLARE_MARK_TABLE(QmlContext);
+    DECLARE_MARKOBJECTS(QmlContext);
 
+    QQmlContextWrapper *qml() { return static_cast<QQmlContextWrapper *>(activation.get()); }
     void init(QV4::ExecutionContext *outerContext, QV4::QQmlContextWrapper *qml);
 };
 
@@ -109,10 +109,10 @@ struct Q_QML_EXPORT QmlContext : public ExecutionContext
     static Heap::QmlContext *create(QV4::ExecutionContext *parent, QQmlContextData *context, QObject *scopeObject);
 
     QObject *qmlScope() const {
-        return d()->qml->scopeObject;
+        return d()->qml()->scopeObject;
     }
     QQmlContextData *qmlContext() const {
-        return *d()->qml->context;
+        return *d()->qml()->context;
     }
 };
 
diff --git a/src/qml/jsruntime/qv4qobjectwrapper.cpp b/src/qml/jsruntime/qv4qobjectwrapper.cpp
index fb3aa47d1b..6d7d929b61 100644
--- a/src/qml/jsruntime/qv4qobjectwrapper.cpp
+++ b/src/qml/jsruntime/qv4qobjectwrapper.cpp
@@ -62,6 +62,7 @@
 #include <private/qv4regexpobject_p.h>
 #include <private/qv4dateobject_p.h>
 #include <private/qv4scopedvalue_p.h>
+#include <private/qv4jscall_p.h>
 #include <private/qv4mm_p.h>
 #include <private/qqmlscriptstring_p.h>
 #include <private/qv4compileddata_p.h>
@@ -468,11 +469,11 @@ void QObjectWrapper::setProperty(ExecutionEngine *engine, QObject *object, QQmlP
             if (auto binding = QQmlPropertyPrivate::binding(object, QQmlPropertyIndex(property->coreIndex()))) {
                 Q_ASSERT(!binding->isValueTypeProxy());
                 const auto qmlBinding = static_cast<const QQmlBinding*>(binding);
-                const auto stackFrame = engine->currentStackFrame();
+                const auto stackFrame = engine->currentStackFrame;
                 qCInfo(lcBindingRemoval,
                        "Overwriting binding on %s::%s at %s:%d that was initially bound at %s",
                        object->metaObject()->className(), qPrintable(property->name(object)),
-                       qPrintable(stackFrame.source), stackFrame.line,
+                       qPrintable(stackFrame->source()), stackFrame->lineNumber(),
                        qPrintable(qmlBinding->expressionIdentifier()));
             }
         }
@@ -815,18 +816,18 @@ struct QObjectSlotDispatcher : public QtPrivate::QSlotObjectBase
             QV4::Scope scope(v4);
             QV4::ScopedFunctionObject f(scope, This->function.value());
 
-            QV4::ScopedCallData callData(scope, argCount);
-            callData->thisObject = This->thisObject.isUndefined() ? v4->globalObject->asReturnedValue() : This->thisObject.value();
+            QV4::JSCallData jsCallData(scope, argCount);
+            *jsCallData->thisObject = This->thisObject.isUndefined() ? v4->globalObject->asReturnedValue() : This->thisObject.value();
             for (int ii = 0; ii < argCount; ++ii) {
                 int type = argsTypes[ii + 1];
                 if (type == qMetaTypeId<QVariant>()) {
-                    callData->args[ii] = v4->fromVariant(*((QVariant *)metaArgs[ii + 1]));
+                    jsCallData->args[ii] = v4->fromVariant(*((QVariant *)metaArgs[ii + 1]));
                 } else {
-                    callData->args[ii] = v4->fromVariant(QVariant(type, metaArgs[ii + 1]));
+                    jsCallData->args[ii] = v4->fromVariant(QVariant(type, metaArgs[ii + 1]));
                 }
             }
 
-            f->call(scope, callData);
+            f->call(jsCallData);
             if (scope.hasException()) {
                 QQmlError error = v4->catchExceptionAsQmlError();
                 if (error.description().isEmpty()) {
@@ -899,9 +900,11 @@ struct QObjectSlotDispatcher : public QtPrivate::QSlotObjectBase
 
 } // namespace QV4
 
-void QObjectWrapper::method_connect(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QObjectWrapper::method_connect(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc == 0)
+    QV4::Scope scope(b);
+
+    if (callData->argc() == 0)
         THROW_GENERIC_ERROR("Function.prototype.connect: no arguments given");
 
     QPair<QObject *, int> signalInfo = extractQtSignal(callData->thisObject);
@@ -920,9 +923,9 @@ void QObjectWrapper::method_connect(const BuiltinFunction *, Scope &scope, CallD
     QV4::ScopedFunctionObject f(scope);
     QV4::ScopedValue thisObject (scope, QV4::Encode::undefined());
 
-    if (callData->argc == 1) {
+    if (callData->argc() == 1) {
         f = callData->args[0];
-    } else if (callData->argc >= 2) {
+    } else if (callData->argc() >= 2) {
         thisObject = callData->args[0];
         f = callData->args[1];
     }
@@ -949,9 +952,11 @@ void QObjectWrapper::method_connect(const BuiltinFunction *, Scope &scope, CallD
     RETURN_UNDEFINED();
 }
 
-void QObjectWrapper::method_disconnect(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QObjectWrapper::method_disconnect(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc == 0)
+    QV4::Scope scope(b);
+
+    if (callData->argc() == 0)
         THROW_GENERIC_ERROR("Function.prototype.disconnect: no arguments given");
 
     QPair<QObject *, int> signalInfo = extractQtSignal(callData->thisObject);
@@ -970,9 +975,9 @@ void QObjectWrapper::method_disconnect(const BuiltinFunction *, Scope &scope, Ca
     QV4::ScopedFunctionObject functionValue(scope);
     QV4::ScopedValue functionThisValue(scope, QV4::Encode::undefined());
 
-    if (callData->argc == 1) {
+    if (callData->argc() == 1) {
         functionValue = callData->args[0];
-    } else if (callData->argc >= 2) {
+    } else if (callData->argc() >= 2) {
         functionThisValue = callData->args[0];
         functionValue = callData->args[1];
     }
@@ -1010,9 +1015,9 @@ static void markChildQObjectsRecursively(QObject *parent, QV4::MarkStack *markSt
     }
 }
 
-void QObjectWrapper::markObjects(Heap::Base *that, QV4::MarkStack *markStack)
+void Heap::QObjectWrapper::markObjects(Heap::Base *that, QV4::MarkStack *markStack)
 {
-    QObjectWrapper::Data *This = static_cast<QObjectWrapper::Data *>(that);
+    QObjectWrapper *This = static_cast<QObjectWrapper *>(that);
 
     if (QObject *o = This->object()) {
         QQmlVMEMetaObject *vme = QQmlVMEMetaObject::get(o);
@@ -1027,7 +1032,7 @@ void QObjectWrapper::markObjects(Heap::Base *that, QV4::MarkStack *markStack)
             markChildQObjectsRecursively(o, markStack);
     }
 
-    QV4::Object::markObjects(that, markStack);
+    Object::markObjects(that, markStack);
 }
 
 void QObjectWrapper::destroyObject(bool lastCall)
@@ -1412,7 +1417,7 @@ static QV4::ReturnedValue CallPrecise(const QQmlObjectOrGadget &object, const QQ
                                       + QLatin1String(unknownTypeError));
         }
 
-        if (args[0] > callArgs->argc) {
+        if (args[0] > callArgs->argc()) {
             QString error = QLatin1String("Insufficient arguments");
             return engine->throwError(error);
         }
@@ -1443,7 +1448,7 @@ static QV4::ReturnedValue CallOverloaded(const QQmlObjectOrGadget &object, const
                                          QV4::ExecutionEngine *engine, QV4::CallData *callArgs, const QQmlPropertyCache *propertyCache,
                                          QMetaObject::Call callType = QMetaObject::InvokeMetaMethod)
 {
-    int argumentCount = callArgs->argc;
+    int argumentCount = callArgs->argc();
 
     QQmlPropertyData best;
     int bestParameterScore = INT_MAX;
@@ -1848,7 +1853,7 @@ const QMetaObject *Heap::QObjectMethod::metaObject()
     return object()->metaObject();
 }
 
-QV4::ReturnedValue QObjectMethod::method_toString(QV4::ExecutionContext *ctx) const
+QV4::ReturnedValue QObjectMethod::method_toString(QV4::ExecutionEngine *engine) const
 {
     QString result;
     if (const QMetaObject *metaObject = d()->metaObject()) {
@@ -1867,15 +1872,15 @@ QV4::ReturnedValue QObjectMethod::method_toString(QV4::ExecutionContext *ctx) co
         result = QLatin1String("null");
     }
 
-    return ctx->engine()->newString(result)->asReturnedValue();
+    return engine->newString(result)->asReturnedValue();
 }
 
-QV4::ReturnedValue QObjectMethod::method_destroy(QV4::ExecutionContext *ctx, const Value *args, int argc) const
+QV4::ReturnedValue QObjectMethod::method_destroy(QV4::ExecutionEngine *engine, const Value *args, int argc) const
 {
     if (!d()->object())
         return Encode::undefined();
     if (QQmlData::keepAliveDuringGarbageCollection(d()->object()))
-        return ctx->engine()->throwError(QStringLiteral("Invalid attempt to destroy() an indestructible object"));
+        return engine->throwError(QStringLiteral("Invalid attempt to destroy() an indestructible object"));
 
     int delay = 0;
     if (argc > 0)
@@ -1889,32 +1894,24 @@ QV4::ReturnedValue QObjectMethod::method_destroy(QV4::ExecutionContext *ctx, con
     return Encode::undefined();
 }
 
-void QObjectMethod::call(const Managed *m, Scope &scope, CallData *callData)
+ReturnedValue QObjectMethod::call(const FunctionObject *m, const Value *thisObject, const Value *argv, int argc)
 {
     const QObjectMethod *This = static_cast<const QObjectMethod*>(m);
-    This->callInternal(callData, scope);
+    return This->callInternal(thisObject, argv, argc);
 }
 
-void QObjectMethod::callInternal(CallData *callData, Scope &scope) const
+ReturnedValue QObjectMethod::callInternal(const Value *thisObject, const Value *argv, int argc) const
 {
     ExecutionEngine *v4 = engine();
-    ExecutionContext *context = v4->currentContext;
-    if (d()->index == DestroyMethod) {
-        scope.result = method_destroy(context, callData->args, callData->argc);
-        return;
-    }
-
-    else if (d()->index == ToStringMethod) {
-        scope.result = method_toString(context);
-        return;
-    }
+    if (d()->index == DestroyMethod)
+        return method_destroy(v4, argv, argc);
+    else if (d()->index == ToStringMethod)
+        return method_toString(v4);
 
     QQmlObjectOrGadget object(d()->object());
     if (!d()->object()) {
-        if (!d()->valueTypeWrapper) {
-            scope.result = Encode::undefined();
-            return;
-        }
+        if (!d()->valueTypeWrapper)
+            return Encode::undefined();
 
         object = QQmlObjectOrGadget(d()->propertyCache(), d()->valueTypeWrapper->gadgetPtr);
     }
@@ -1923,20 +1920,16 @@ void QObjectMethod::callInternal(CallData *callData, Scope &scope) const
 
     if (d()->propertyCache()) {
         QQmlPropertyData *data = d()->propertyCache()->method(d()->index);
-        if (!data) {
-            scope.result = QV4::Encode::undefined();
-            return;
-        }
+        if (!data)
+            return QV4::Encode::undefined();
         method = *data;
     } else {
         const QMetaObject *mo = d()->object()->metaObject();
         const QMetaMethod moMethod = mo->method(d()->index);
         method.load(moMethod);
 
-        if (method.coreIndex() == -1) {
-            scope.result = QV4::Encode::undefined();
-            return;
-        }
+        if (method.coreIndex() == -1)
+            return QV4::Encode::undefined();
 
         // Look for overloaded methods
         QByteArray methodName = moMethod.name();
@@ -1951,21 +1944,25 @@ void QObjectMethod::callInternal(CallData *callData, Scope &scope) const
         }
     }
 
+    Scope scope(v4);
+    JSCallData cData(scope, argc, argv, thisObject);
+    CallData *callData = cData.callData();
+
     if (method.isV4Function()) {
-        scope.result = QV4::Encode::undefined();
-        QQmlV4Function func(callData, &scope.result, v4);
+        QV4::ScopedValue rv(scope, QV4::Primitive::undefinedValue());
+        QQmlV4Function func(callData, rv, v4);
         QQmlV4Function *funcptr = &func;
 
         void *args[] = { 0, &funcptr };
         object.metacall(QMetaObject::InvokeMetaMethod, method.coreIndex(), args);
 
-        return;
+        return rv->asReturnedValue();
     }
 
     if (!method.isOverload()) {
-        scope.result = CallPrecise(object, method, v4, callData);
+        return CallPrecise(object, method, v4, callData);
     } else {
-        scope.result = CallOverloaded(object, method, v4, callData, d()->propertyCache());
+        return CallOverloaded(object, method, v4, callData, d()->propertyCache());
     }
 }
 
@@ -2028,13 +2025,14 @@ void QMetaObjectWrapper::init(ExecutionEngine *) {
     }
 }
 
-void QMetaObjectWrapper::construct(const Managed *m, Scope &scope, CallData *callData)
+ReturnedValue QMetaObjectWrapper::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    const QMetaObjectWrapper *This = static_cast<const QMetaObjectWrapper*>(m);
-    scope.result = This->constructInternal(callData);
+    const QMetaObjectWrapper *This = static_cast<const QMetaObjectWrapper*>(f);
+    return This->constructInternal(argv, argc);
 }
 
-ReturnedValue QMetaObjectWrapper::constructInternal(CallData * callData) const {
+ReturnedValue QMetaObjectWrapper::constructInternal(const Value *argv, int argc) const
+{
 
     d()->ensureConstructorsCache();
 
@@ -2047,6 +2045,8 @@ ReturnedValue QMetaObjectWrapper::constructInternal(CallData * callData) const {
 
     Scope scope(v4);
     Scoped<QObjectWrapper> object(scope);
+    JSCallData cData(scope, argc, argv);
+    CallData *callData = cData.callData();
 
     if (d()->constructorCount == 1) {
         object = callConstructor(d()->constructors[0], v4, callData);
@@ -2071,7 +2071,7 @@ ReturnedValue QMetaObjectWrapper::callConstructor(const QQmlPropertyData &data,
 
 ReturnedValue QMetaObjectWrapper::callOverloadedConstructor(QV4::ExecutionEngine *engine, QV4::CallData *callArgs) const {
     const int numberOfConstructors = d()->constructorCount;
-    const int argumentCount = callArgs->argc;
+    const int argumentCount = callArgs->argc();
     const QQmlStaticMetaObject object(d()->metaObject);
 
     QQmlPropertyData best;
diff --git a/src/qml/jsruntime/qv4qobjectwrapper_p.h b/src/qml/jsruntime/qv4qobjectwrapper_p.h
index 018e444f7c..c00e82e4fa 100644
--- a/src/qml/jsruntime/qv4qobjectwrapper_p.h
+++ b/src/qml/jsruntime/qv4qobjectwrapper_p.h
@@ -90,6 +90,7 @@ struct Q_QML_EXPORT QObjectWrapper : Object {
     }
 
     QObject *object() const { return qObj.data(); }
+    static void markObjects(Heap::Base *that, MarkStack *markStack);
 
 private:
     QQmlQPointer<QObject> qObj;
@@ -102,7 +103,7 @@ private:
     Member(class, NoMark, int, index)
 
 DECLARE_HEAP_OBJECT(QObjectMethod, FunctionObject) {
-    DECLARE_MARK_TABLE(QObjectMethod);
+    DECLARE_MARKOBJECTS(QObjectMethod);
 
     void init(QV4::ExecutionContext *scope);
     void destroy()
@@ -196,10 +197,9 @@ protected:
     static bool put(Managed *m, String *name, const Value &value);
     static PropertyAttributes query(const Managed *, String *name);
     static void advanceIterator(Managed *m, ObjectIterator *it, Value *name, uint *index, Property *p, PropertyAttributes *attributes);
-    static void markObjects(Heap::Base *that, QV4::MarkStack *markStack);
 
-    static void method_connect(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_disconnect(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_connect(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_disconnect(const BuiltinFunction *, CallData *callData);
 
 private:
     Q_NEVER_INLINE static ReturnedValue wrap_slowPath(ExecutionEngine *engine, QObject *object);
@@ -234,12 +234,12 @@ struct Q_QML_EXPORT QObjectMethod : public QV4::FunctionObject
     int methodIndex() const { return d()->index; }
     QObject *object() const { return d()->object(); }
 
-    QV4::ReturnedValue method_toString(QV4::ExecutionContext *ctx) const;
-    QV4::ReturnedValue method_destroy(QV4::ExecutionContext *ctx, const Value *args, int argc) const;
+    QV4::ReturnedValue method_toString(QV4::ExecutionEngine *engine) const;
+    QV4::ReturnedValue method_destroy(QV4::ExecutionEngine *ctx, const Value *args, int argc) const;
 
-    static void call(const Managed *, Scope &scope, CallData *callData);
+    static ReturnedValue call(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 
-    void callInternal(CallData *callData, Scope &scope) const;
+    ReturnedValue callInternal(const Value *thisObject, const Value *argv, int argc) const;
 
     static QPair<QObject *, int> extractQtMethod(const QV4::FunctionObject *function);
 };
@@ -251,14 +251,14 @@ struct Q_QML_EXPORT QMetaObjectWrapper : public QV4::FunctionObject
     V4_NEEDS_DESTROY
 
     static ReturnedValue create(ExecutionEngine *engine, const QMetaObject* metaObject);
-    static void construct(const Managed *, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *, const Value *argv, int argc);
     static bool isEqualTo(Managed *a, Managed *b);
 
     const QMetaObject *metaObject() const { return d()->metaObject; }
 
 private:
     void init(ExecutionEngine *engine);
-    ReturnedValue constructInternal(CallData *callData) const;
+    ReturnedValue constructInternal(const Value *argv, int argc) const;
     ReturnedValue callConstructor(const QQmlPropertyData &data, QV4::ExecutionEngine *engine, QV4::CallData *callArgs) const;
     ReturnedValue callOverloadedConstructor(QV4::ExecutionEngine *engine, QV4::CallData *callArgs) const;
 
diff --git a/src/qml/jsruntime/qv4regexp.cpp b/src/qml/jsruntime/qv4regexp.cpp
index 162f0fba57..fb49def317 100644
--- a/src/qml/jsruntime/qv4regexp.cpp
+++ b/src/qml/jsruntime/qv4regexp.cpp
@@ -62,7 +62,7 @@ uint RegExp::match(const QString &string, int start, uint *matchOffsets)
     WTF::String s(string);
 
 #if ENABLE(YARR_JIT)
-    if (!jitCode()->isFallBack() && jitCode()->has16BitCode())
+    if (d()->hasValidJITCode())
         return uint(jitCode()->execute(s.characters16(), start, s.length(), (int*)matchOffsets).start);
 #endif
 
@@ -82,7 +82,7 @@ Heap::RegExp *RegExp::create(ExecutionEngine* engine, const QString& pattern, bo
         return result->d();
 
     Scope scope(engine);
-    Scoped<RegExp> result(scope, engine->memoryManager->alloc<RegExp>(engine, pattern, ignoreCase, multiline, global));
+    Scoped<RegExp> result(scope, engine->memoryManager->alloc<RegExp>(pattern, ignoreCase, multiline, global));
 
     result->d()->cache = cache;
     cachedValue.set(engine, result);
@@ -90,7 +90,7 @@ Heap::RegExp *RegExp::create(ExecutionEngine* engine, const QString& pattern, bo
     return result->d();
 }
 
-void Heap::RegExp::init(ExecutionEngine* engine, const QString &pattern, bool ignoreCase, bool multiline, bool global)
+void Heap::RegExp::init(const QString &pattern, bool ignoreCase, bool multiline, bool global)
 {
     Base::init();
     this->pattern = new QString(pattern);
@@ -98,20 +98,28 @@ void Heap::RegExp::init(ExecutionEngine* engine, const QString &pattern, bool ig
     this->multiLine = multiline;
     this->global = global;
 
+    valid = false;
+
     const char* error = 0;
-    JSC::Yarr::YarrPattern yarrPattern(WTF::String(pattern), ignoreCase, multiline, &error);
+    JSC::Yarr::YarrPattern yarrPattern(WTF::String(pattern), ignoreCase, multiLine, &error);
     if (error)
         return;
     subPatternCount = yarrPattern.m_numSubpatterns;
-    OwnPtr<JSC::Yarr::BytecodePattern> p = JSC::Yarr::byteCompile(yarrPattern, engine->bumperPointerAllocator);
-    byteCode = p.take();
 #if ENABLE(YARR_JIT)
-    jitCode = new JSC::Yarr::YarrCodeBlock;
-    if (!yarrPattern.m_containsBackreferences && engine->iselFactory->jitCompileRegexps()) {
-        JSC::JSGlobalData dummy(engine->regExpAllocator);
+    if (!yarrPattern.m_containsBackreferences) {
+        jitCode = new JSC::Yarr::YarrCodeBlock;
+        JSC::JSGlobalData dummy(internalClass->engine->regExpAllocator);
         JSC::Yarr::jitCompile(yarrPattern, JSC::Yarr::Char16, &dummy, *jitCode);
     }
 #endif
+    if (hasValidJITCode()) {
+        valid = true;
+        return;
+    }
+    OwnPtr<JSC::Yarr::BytecodePattern> p = JSC::Yarr::byteCompile(yarrPattern, internalClass->engine->bumperPointerAllocator);
+    byteCode = p.take();
+    if (byteCode)
+        valid = true;
 }
 
 void Heap::RegExp::destroy()
diff --git a/src/qml/jsruntime/qv4regexp_p.h b/src/qml/jsruntime/qv4regexp_p.h
index 998f6e3da3..498468e165 100644
--- a/src/qml/jsruntime/qv4regexp_p.h
+++ b/src/qml/jsruntime/qv4regexp_p.h
@@ -76,7 +76,7 @@ struct RegExpCacheKey;
 namespace Heap {
 
 struct RegExp : Base {
-    void init(ExecutionEngine* engine, const QString& pattern, bool ignoreCase, bool multiline, bool global);
+    void init(const QString& pattern, bool ignoreCase, bool multiline, bool global);
     void destroy();
 
     QString *pattern;
@@ -84,11 +84,19 @@ struct RegExp : Base {
 #if ENABLE(YARR_JIT)
     JSC::Yarr::YarrCodeBlock *jitCode;
 #endif
+    bool hasValidJITCode() const {
+#if ENABLE(YARR_JIT)
+        return jitCode && !jitCode->isFallBack() && jitCode->has16BitCode();
+#else
+        return false;
+#endif
+    }
     RegExpCache *cache;
     int subPatternCount;
     bool ignoreCase;
     bool multiLine;
     bool global;
+    bool valid;
 
     int captureCount() const { return subPatternCount + 1; }
 };
@@ -116,7 +124,7 @@ struct RegExp : public Managed
 
     static Heap::RegExp *create(ExecutionEngine* engine, const QString& pattern, bool ignoreCase = false, bool multiline = false, bool global = false);
 
-    bool isValid() const { return d()->byteCode; }
+    bool isValid() const { return d()->valid; }
 
     uint match(const QString& string, int start, uint *matchOffsets);
 
diff --git a/src/qml/jsruntime/qv4regexpobject.cpp b/src/qml/jsruntime/qv4regexpobject.cpp
index 83bfe21c67..f95719b25f 100644
--- a/src/qml/jsruntime/qv4regexpobject.cpp
+++ b/src/qml/jsruntime/qv4regexpobject.cpp
@@ -38,20 +38,17 @@
 ****************************************************************************/
 
 #include "qv4regexpobject_p.h"
-#include "qv4jsir_p.h"
-#include "qv4isel_p.h"
 #include "qv4objectproto_p.h"
 #include "qv4regexp_p.h"
 #include "qv4stringobject_p.h"
 #include <private/qv4mm_p.h>
 #include "qv4scopedvalue_p.h"
+#include "qv4jscall_p.h"
 
 #include <private/qqmljsengine_p.h>
 #include <private/qqmljslexer_p.h>
 #include <private/qqmljsparser_p.h>
 #include <private/qqmljsast_p.h>
-#include <qv4jsir_p.h>
-#include <qv4codegen_p.h>
 #include "private/qlocale_tools_p.h"
 
 #include <QtCore/QDebug>
@@ -217,39 +214,33 @@ void Heap::RegExpCtor::clearLastMatch()
     lastMatchEnd = 0;
 }
 
-void RegExpCtor::construct(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue RegExpCtor::callAsConstructor(const FunctionObject *fo, const Value *argv, int argc)
 {
-    ScopedValue r(scope, callData->argument(0));
-    ScopedValue f(scope, callData->argument(1));
+    Scope scope(fo->engine());
+    ScopedValue r(scope, argc ? argv[0] : Primitive::undefinedValue());
+    ScopedValue f(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
     Scoped<RegExpObject> re(scope, r);
     if (re) {
-        if (!f->isUndefined()) {
-            scope.result = scope.engine->throwTypeError();
-            return;
-        }
+        if (!f->isUndefined())
+            return scope.engine->throwTypeError();
 
         Scoped<RegExp> regexp(scope, re->value());
-        scope.result = Encode(scope.engine->newRegExpObject(regexp));
-        return;
+        return Encode(scope.engine->newRegExpObject(regexp));
     }
 
     QString pattern;
     if (!r->isUndefined())
         pattern = r->toQString();
-    if (scope.hasException()) {
-        scope.result = Encode::undefined();
-        return;
-    }
+    if (scope.hasException())
+        return Encode::undefined();
 
     bool global = false;
     bool ignoreCase = false;
     bool multiLine = false;
     if (!f->isUndefined()) {
         ScopedString s(scope, f->toString(scope.engine));
-        if (scope.hasException()) {
-            scope.result = Encode::undefined();
-            return;
-        }
+        if (scope.hasException())
+            return Encode::undefined();
         QString str = s->toQString();
         for (int i = 0; i < str.length(); ++i) {
             if (str.at(i) == QLatin1Char('g') && !global) {
@@ -259,31 +250,27 @@ void RegExpCtor::construct(const Managed *, Scope &scope, CallData *callData)
             } else if (str.at(i) == QLatin1Char('m') && !multiLine) {
                 multiLine = true;
             } else {
-                scope.result = scope.engine->throwSyntaxError(QStringLiteral("Invalid flags supplied to RegExp constructor"));
-                return;
+                return scope.engine->throwSyntaxError(QStringLiteral("Invalid flags supplied to RegExp constructor"));
             }
         }
     }
 
     Scoped<RegExp> regexp(scope, RegExp::create(scope.engine, pattern, ignoreCase, multiLine, global));
     if (!regexp->isValid()) {
-        scope.result = scope.engine->throwSyntaxError(QStringLiteral("Invalid regular expression"));
-        return;
+        return scope.engine->throwSyntaxError(QStringLiteral("Invalid regular expression"));
     }
 
-    scope.result = Encode(scope.engine->newRegExpObject(regexp));
+    return Encode(scope.engine->newRegExpObject(regexp));
 }
 
-void RegExpCtor::call(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue RegExpCtor::call(const FunctionObject *f, const Value *, const Value *argv, int argc)
 {
-    if (callData->argc > 0 && callData->args[0].as<RegExpObject>()) {
-        if (callData->argc == 1 || callData->args[1].isUndefined()) {
-            scope.result = callData->args[0];
-            return;
-        }
+    if (argc > 0 && argv[0].as<RegExpObject>()) {
+        if (argc == 1 || argv[1].isUndefined())
+            return Encode(argv[0]);
     }
 
-    construct(that, scope, callData);
+    return callAsConstructor(f, argv, argc);
 }
 
 void RegExpPrototype::init(ExecutionEngine *engine, Object *constructor)
@@ -323,13 +310,60 @@ void RegExpPrototype::init(ExecutionEngine *engine, Object *constructor)
     defineDefaultProperty(QStringLiteral("compile"), method_compile, 2);
 }
 
-void RegExpPrototype::method_exec(const BuiltinFunction *, Scope &scope, CallData *callData)
+/* used by String.match */
+ReturnedValue RegExpPrototype::execFirstMatch(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
+{
+    Scope scope(b);
+    Scoped<RegExpObject> r(scope, thisObject->as<RegExpObject>());
+    Q_ASSERT(r && r->global());
+
+    ScopedString str(scope, argc ? argv[0] : Primitive::undefinedValue());
+    Q_ASSERT(str);
+    QString s = str->toQString();
+
+    int offset = r->lastIndex();
+    if (offset < 0 || offset > s.length()) {
+        r->setLastIndex(0);
+        RETURN_RESULT(Encode::null());
+    }
+
+    Q_ALLOCA_VAR(uint, matchOffsets, r->value()->captureCount() * 2 * sizeof(uint));
+    const int result = Scoped<RegExp>(scope, r->value())->match(s, offset, matchOffsets);
+
+    RegExpCtor *regExpCtor = static_cast<RegExpCtor *>(scope.engine->regExpCtor());
+    regExpCtor->d()->clearLastMatch();
+
+    if (result == -1) {
+        r->setLastIndex(0);
+        RETURN_RESULT(Encode::null());
+    }
+
+    ReturnedValue retVal = Encode::undefined();
+    // return first match
+    if (r->value()->captureCount()) {
+        int start = matchOffsets[0];
+        int end = matchOffsets[1];
+        retVal = (start != -1) ? scope.engine->newString(s.mid(start, end - start))->asReturnedValue() : Encode::undefined();
+    }
+
+    RegExpCtor::Data *dd = regExpCtor->d();
+    dd->lastInput.set(scope.engine, str->d());
+    dd->lastMatchStart = matchOffsets[0];
+    dd->lastMatchEnd = matchOffsets[1];
+
+    r->setLastIndex(matchOffsets[1]);
+
+    return retVal;
+}
+
+ReturnedValue RegExpPrototype::method_exec(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<RegExpObject> r(scope, callData->thisObject.as<RegExpObject>());
+    Scope scope(b);
+    Scoped<RegExpObject> r(scope, thisObject->as<RegExpObject>());
     if (!r)
-        THROW_TYPE_ERROR();
+        return scope.engine->throwTypeError();
 
-    ScopedValue arg(scope, callData->argument(0));
+    ScopedValue arg(scope, argc ? argv[0]: Primitive::undefinedValue());
     ScopedString str(scope, arg->toString(scope.engine));
     if (scope.hasException())
         RETURN_UNDEFINED();
@@ -344,7 +378,7 @@ void RegExpPrototype::method_exec(const BuiltinFunction *, Scope &scope, CallDat
     Q_ALLOCA_VAR(uint, matchOffsets, r->value()->captureCount() * 2 * sizeof(uint));
     const int result = Scoped<RegExp>(scope, r->value())->match(s, offset, matchOffsets);
 
-    Scoped<RegExpCtor> regExpCtor(scope, scope.engine->regExpCtor());
+    RegExpCtor *regExpCtor = static_cast<RegExpCtor *>(scope.engine->regExpCtor());
     regExpCtor->d()->clearLastMatch();
 
     if (result == -1) {
@@ -376,73 +410,78 @@ void RegExpPrototype::method_exec(const BuiltinFunction *, Scope &scope, CallDat
     if (r->global())
         r->setLastIndex(matchOffsets[1]);
 
-    scope.result = array;
+    return array.asReturnedValue();
 }
 
-void RegExpPrototype::method_test(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue RegExpPrototype::method_test(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    method_exec(b, scope, callData);
-    scope.result = Encode(!scope.result.isNull());
+    Value res = Value::fromReturnedValue(method_exec(b, thisObject, argv, argc));
+    return Encode(!res.isNull());
 }
 
-void RegExpPrototype::method_toString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue RegExpPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Scoped<RegExpObject> r(scope, callData->thisObject.as<RegExpObject>());
+    ExecutionEngine *v4 = b->engine();
+    const RegExpObject *r = thisObject->as<RegExpObject>();
     if (!r)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
-    scope.result = scope.engine->newString(r->toString());
+    return Encode(v4->newString(r->toString()));
 }
 
-void RegExpPrototype::method_compile(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue RegExpPrototype::method_compile(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<RegExpObject> r(scope, callData->thisObject.as<RegExpObject>());
+    Scope scope(b);
+    Scoped<RegExpObject> r(scope, thisObject->as<RegExpObject>());
     if (!r)
-        THROW_TYPE_ERROR();
-
-    ScopedCallData cData(scope, callData->argc);
-    memcpy(cData->args, callData->args, callData->argc*sizeof(Value));
+        return scope.engine->throwTypeError();
 
-    scope.engine->regExpCtor()->as<FunctionObject>()->construct(scope, cData);
-    Scoped<RegExpObject> re(scope, scope.result.asReturnedValue());
+    Scoped<RegExpObject> re(scope, scope.engine->regExpCtor()->callAsConstructor(argv, argc));
 
     r->d()->value.set(scope.engine, re->value());
+    return Encode::undefined();
 }
 
 template <int index>
-void RegExpPrototype::method_get_lastMatch_n(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue RegExpPrototype::method_get_lastMatch_n(const FunctionObject *b, const Value *, const Value *, int)
 {
+    Scope scope(b);
     ScopedArrayObject lastMatch(scope, static_cast<RegExpCtor*>(scope.engine->regExpCtor())->lastMatch());
-    scope.result = lastMatch ? lastMatch->getIndexed(index) : Encode::undefined();
-    if (scope.result.isUndefined())
-        scope.result = scope.engine->newString();
+    ScopedValue res(scope, lastMatch ? lastMatch->getIndexed(index) : Encode::undefined());
+    if (res->isUndefined())
+        res = scope.engine->newString();
+    return res->asReturnedValue();
 }
 
-void RegExpPrototype::method_get_lastParen(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue RegExpPrototype::method_get_lastParen(const FunctionObject *b, const Value *, const Value *, int)
 {
+    Scope scope(b);
     ScopedArrayObject lastMatch(scope, static_cast<RegExpCtor*>(scope.engine->regExpCtor())->lastMatch());
-    scope.result = lastMatch ? lastMatch->getIndexed(lastMatch->getLength() - 1) : Encode::undefined();
-    if (scope.result.isUndefined())
-        scope.result = scope.engine->newString();
+    ScopedValue res(scope, lastMatch ? lastMatch->getIndexed(lastMatch->getLength() - 1) : Encode::undefined());
+    if (res->isUndefined())
+        res = scope.engine->newString();
+    return res->asReturnedValue();
 }
 
-void RegExpPrototype::method_get_input(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue RegExpPrototype::method_get_input(const FunctionObject *b, const Value *, const Value *, int)
 {
-    scope.result = static_cast<RegExpCtor*>(scope.engine->regExpCtor())->lastInput();
+    return static_cast<RegExpCtor*>(b->engine()->regExpCtor())->lastInput()->asReturnedValue();
 }
 
-void RegExpPrototype::method_get_leftContext(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue  RegExpPrototype::method_get_leftContext(const FunctionObject *b, const Value *, const Value *, int)
 {
+    Scope scope(b);
     Scoped<RegExpCtor> regExpCtor(scope, scope.engine->regExpCtor());
     QString lastInput = regExpCtor->lastInput()->toQString();
-    scope.result = scope.engine->newString(lastInput.left(regExpCtor->lastMatchStart()));
+    return Encode(scope.engine->newString(lastInput.left(regExpCtor->lastMatchStart())));
 }
 
-void RegExpPrototype::method_get_rightContext(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue  RegExpPrototype::method_get_rightContext(const FunctionObject *b, const Value *, const Value *, int)
 {
+    Scope scope(b);
     Scoped<RegExpCtor> regExpCtor(scope, scope.engine->regExpCtor());
     QString lastInput = regExpCtor->lastInput()->toQString();
-    scope.result = scope.engine->newString(lastInput.mid(regExpCtor->lastMatchEnd()));
+    return Encode(scope.engine->newString(lastInput.mid(regExpCtor->lastMatchEnd())));
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/jsruntime/qv4regexpobject_p.h b/src/qml/jsruntime/qv4regexpobject_p.h
index 65055ccc81..181628241b 100644
--- a/src/qml/jsruntime/qv4regexpobject_p.h
+++ b/src/qml/jsruntime/qv4regexpobject_p.h
@@ -55,8 +55,6 @@
 #include "qv4context_p.h"
 #include "qv4functionobject_p.h"
 #include "qv4string_p.h"
-#include <qv4codegen_p.h>
-#include <qv4isel_p.h>
 #include "qv4managed_p.h"
 #include "qv4property_p.h"
 #include "qv4objectiterator_p.h"
@@ -78,7 +76,7 @@ namespace Heap {
     Member(class, Pointer, RegExp *, value)
 
 DECLARE_HEAP_OBJECT(RegExpObject, Object) {
-    DECLARE_MARK_TABLE(RegExpObject);
+    DECLARE_MARKOBJECTS(RegExpObject);
 
     void init();
     void init(QV4::RegExp *value);
@@ -92,7 +90,7 @@ DECLARE_HEAP_OBJECT(RegExpObject, Object) {
     Member(class, NoMark, int, lastMatchEnd)
 
 DECLARE_HEAP_OBJECT(RegExpCtor, FunctionObject) {
-    DECLARE_MARK_TABLE(RegExpCtor);
+    DECLARE_MARKOBJECTS(RegExpCtor);
 
     void init(QV4::ExecutionContext *scope);
     void clearLastMatch();
@@ -106,7 +104,7 @@ struct RegExpObject: Object {
     V4_INTERNALCLASS(RegExpObject)
     V4_PROTOTYPE(regExpPrototype)
 
-    // needs to be compatible with the flags in qv4jsir_p.h
+    // needs to be compatible with the flags in qv4compileddata_p.h
     enum Flags {
         RegExp_Global     = 0x01,
         RegExp_IgnoreCase = 0x02,
@@ -123,6 +121,8 @@ struct RegExpObject: Object {
         Index_ArrayInput = Index_ArrayIndex + 1
     };
 
+    enum { NInlineProperties = 5 };
+
     Heap::RegExp *value() const { return d()->value; }
     bool global() const { return d()->value->global; }
 
@@ -152,25 +152,27 @@ struct RegExpCtor: FunctionObject
     int lastMatchStart() { return d()->lastMatchStart; }
     int lastMatchEnd() { return d()->lastMatchEnd; }
 
-    static void construct(const Managed *m, Scope &scope, CallData *callData);
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct RegExpPrototype: RegExpObject
 {
     void init(ExecutionEngine *engine, Object *ctor);
 
-    static void method_exec(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_test(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_compile(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_exec(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_test(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_compile(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 
     template <int index>
-    static void method_get_lastMatch_n(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_lastParen(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_input(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_leftContext(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_rightContext(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_get_lastMatch_n(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_get_lastParen(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_get_input(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_get_leftContext(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_get_rightContext(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+
+    static ReturnedValue execFirstMatch(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc);
 };
 
 }
diff --git a/src/qml/jsruntime/qv4runtime.cpp b/src/qml/jsruntime/qv4runtime.cpp
index 4b952bcbbc..c41b720610 100644
--- a/src/qml/jsruntime/qv4runtime.cpp
+++ b/src/qml/jsruntime/qv4runtime.cpp
@@ -55,6 +55,7 @@
 #include "qv4regexpobject_p.h"
 #include "private/qlocale_tools_p.h"
 #include "qv4scopedvalue_p.h"
+#include "qv4jscall_p.h"
 #include <private/qv4qmlcontext_p.h>
 #include <private/qqmltypewrapper_p.h>
 #include <private/qqmlengine_p.h>
@@ -310,47 +311,47 @@ void RuntimeHelpers::numberToString(QString *result, double num, int radix)
 
 ReturnedValue Runtime::method_closure(ExecutionEngine *engine, int functionId)
 {
-    QV4::Function *clos = static_cast<CompiledData::CompilationUnit*>(engine->current->compilationUnit)->runtimeFunctions[functionId];
+    QV4::Function *clos = static_cast<CompiledData::CompilationUnit*>(engine->currentStackFrame->v4Function->compilationUnit)->runtimeFunctions[functionId];
     Q_ASSERT(clos);
-    return FunctionObject::createScriptFunction(engine->currentContext, clos)->asReturnedValue();
+    ExecutionContext *current = static_cast<ExecutionContext *>(&engine->currentStackFrame->jsFrame->context);
+    return FunctionObject::createScriptFunction(current, clos)->asReturnedValue();
 }
 
-ReturnedValue Runtime::method_deleteElement(ExecutionEngine *engine, const Value &base, const Value &index)
+bool Runtime::method_deleteElement(ExecutionEngine *engine, const Value &base, const Value &index)
 {
     Scope scope(engine);
     ScopedObject o(scope, base);
     if (o) {
         uint n = index.asArrayIndex();
-        if (n < UINT_MAX) {
-            return Encode((bool)o->deleteIndexedProperty(n));
-        }
+        if (n < UINT_MAX)
+            return o->deleteIndexedProperty(n);
     }
 
     ScopedString name(scope, index.toString(engine));
     return method_deleteMemberString(engine, base, name);
 }
 
-ReturnedValue Runtime::method_deleteMember(ExecutionEngine *engine, const Value &base, int nameIndex)
+bool Runtime::method_deleteMember(ExecutionEngine *engine, const Value &base, int nameIndex)
 {
     Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
     return method_deleteMemberString(engine, base, name);
 }
 
-ReturnedValue Runtime::method_deleteMemberString(ExecutionEngine *engine, const Value &base, String *name)
+bool Runtime::method_deleteMemberString(ExecutionEngine *engine, const Value &base, String *name)
 {
     Scope scope(engine);
     ScopedObject obj(scope, base.toObject(engine));
     if (scope.engine->hasException)
         return Encode::undefined();
-    return Encode(obj->deleteProperty(name));
+    return obj->deleteProperty(name);
 }
 
-ReturnedValue Runtime::method_deleteName(ExecutionEngine *engine, int nameIndex)
+bool Runtime::method_deleteName(ExecutionEngine *engine, int nameIndex)
 {
     Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
-    return Encode(engine->currentContext->deleteProperty(name));
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
+    return static_cast<ExecutionContext &>(engine->currentStackFrame->jsFrame->context).deleteProperty(name);
 }
 
 QV4::ReturnedValue Runtime::method_instanceof(ExecutionEngine *engine, const Value &lval, const Value &rval)
@@ -425,14 +426,13 @@ ReturnedValue RuntimeHelpers::objectDefaultValue(const Object *object, int typeH
         qSwap(meth1, meth2);
 
     Scope scope(engine);
-    ScopedCallData callData(scope, 0);
-    callData->thisObject = *object;
-
+    ScopedValue result(scope);
     ScopedValue conv(scope, object->get(meth1));
+
     if (FunctionObject *o = conv->as<FunctionObject>()) {
-        o->call(scope, callData);
-        if (scope.result.isPrimitive())
-            return scope.result.asReturnedValue();
+        result = o->call(object, nullptr, 0);
+        if (result->isPrimitive())
+            return result->asReturnedValue();
     }
 
     if (engine->hasException)
@@ -440,9 +440,9 @@ ReturnedValue RuntimeHelpers::objectDefaultValue(const Object *object, int typeH
 
     conv = object->get(meth2);
     if (FunctionObject *o = conv->as<FunctionObject>()) {
-        o->call(scope, callData);
-        if (scope.result.isPrimitive())
-            return scope.result.asReturnedValue();
+        result = o->call(object, nullptr, 0);
+        if (result->isPrimitive())
+            return result->asReturnedValue();
     }
 
     return engine->throwTypeError();
@@ -469,8 +469,9 @@ Heap::Object *RuntimeHelpers::convertToObject(ExecutionEngine *engine, const Val
     }
 }
 
-Heap::String *RuntimeHelpers::convertToString(ExecutionEngine *engine, const Value &value)
+Heap::String *RuntimeHelpers::convertToString(ExecutionEngine *engine, Value value, TypeHint hint)
 {
+  redo:
     switch (value.type()) {
     case Value::Empty_Type:
         Q_ASSERT(!"empty Value encountered");
@@ -484,15 +485,15 @@ Heap::String *RuntimeHelpers::convertToString(ExecutionEngine *engine, const Val
             return engine->id_true()->d();
         else
             return engine->id_false()->d();
-    case Value::Managed_Type:
-        if (String *s = value.stringValue())
-            return s->d();
-        {
-            Scope scope(engine);
-            ScopedValue prim(scope, RuntimeHelpers::toPrimitive(value, STRING_HINT));
-            Q_ASSERT(!prim->isManaged() || prim->isString());
-            return RuntimeHelpers::convertToString(engine, prim);
-        }
+    case Value::Managed_Type: {
+        if (value.isString())
+            return static_cast<const String &>(value).d();
+        value = Primitive::fromReturnedValue(RuntimeHelpers::toPrimitive(value, hint));
+        Q_ASSERT(value.isPrimitive());
+        if (value.isString())
+            return static_cast<const String &>(value).d();
+        goto redo;
+    }
     case Value::Integer_Type:
         return RuntimeHelpers::stringFromNumber(engine, value.int_32());
     default: // double
@@ -502,34 +503,9 @@ Heap::String *RuntimeHelpers::convertToString(ExecutionEngine *engine, const Val
 
 // This is slightly different from the method above, as
 // the + operator requires a slightly different conversion
-static Heap::String *convert_to_string_add(ExecutionEngine *engine, const Value &value)
+static Heap::String *convert_to_string_add(ExecutionEngine *engine, Value value)
 {
-    switch (value.type()) {
-    case Value::Empty_Type:
-        Q_ASSERT(!"empty Value encountered");
-        Q_UNREACHABLE();
-    case Value::Undefined_Type:
-        return engine->id_undefined()->d();
-    case Value::Null_Type:
-        return engine->id_null()->d();
-    case Value::Boolean_Type:
-        if (value.booleanValue())
-            return engine->id_true()->d();
-        else
-            return engine->id_false()->d();
-    case Value::Managed_Type:
-        if (String *s = value.stringValue())
-            return s->d();
-        {
-            Scope scope(engine);
-            ScopedValue prim(scope, RuntimeHelpers::toPrimitive(value, PREFERREDTYPE_HINT));
-            return RuntimeHelpers::convertToString(engine, prim);
-        }
-    case Value::Integer_Type:
-        return RuntimeHelpers::stringFromNumber(engine, value.int_32());
-    default: // double
-        return RuntimeHelpers::stringFromNumber(engine, value.doubleValue());
-    } // switch
+    return RuntimeHelpers::convertToString(engine, value, PREFERREDTYPE_HINT);
 }
 
 QV4::ReturnedValue RuntimeHelpers::addHelper(ExecutionEngine *engine, const Value &left, const Value &right)
@@ -549,7 +525,7 @@ QV4::ReturnedValue RuntimeHelpers::addHelper(ExecutionEngine *engine, const Valu
             pright = convert_to_string_add(engine, pright);
             sright = static_cast<String *>(pright.ptr);
         }
-        if (scope.engine->hasException)
+        if (engine->hasException)
             return Encode::undefined();
         if (!sleft->d()->length())
             return sright->asReturnedValue();
@@ -563,42 +539,14 @@ QV4::ReturnedValue RuntimeHelpers::addHelper(ExecutionEngine *engine, const Valu
     return Encode(x + y);
 }
 
-QV4::ReturnedValue Runtime::method_addString(ExecutionEngine *engine, const Value &left, const Value &right)
+bool Runtime::method_storeProperty(ExecutionEngine *engine, const Value &object, int nameIndex, const Value &value)
 {
-    Q_ASSERT(left.isString() || right.isString());
-
     Scope scope(engine);
-    ScopedValue pleft(scope, left);
-    ScopedValue pright(scope, right);
-    String *sleft = pleft->stringValue();
-    String *sright = pright->stringValue();
-
-    if (!sleft) {
-        pleft = convert_to_string_add(engine, pleft);
-        sleft = static_cast<String *>(pleft.ptr);
-    }
-    if (!sright) {
-        pright = convert_to_string_add(engine, pright);
-        sright = static_cast<String *>(pright.ptr);
-    }
-    if (scope.engine->hasException)
-        return Encode::undefined();
-    if (!sleft->d()->length())
-        return pright->asReturnedValue();
-    if (!sright->d()->length())
-        return pleft->asReturnedValue();
-    MemoryManager *mm = engine->memoryManager;
-    return (mm->alloc<String>(sleft->d(), sright->d()))->asReturnedValue();
-}
-
-void Runtime::method_setProperty(ExecutionEngine *engine, const Value &object, int nameIndex, const Value &value)
-{
-    Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
     ScopedObject o(scope, object.toObject(engine));
     if (!o)
-        return;
-    o->put(name, value);
+        return false;
+    return o->put(name, value);
 }
 
 static Q_NEVER_INLINE ReturnedValue getElementIntFallback(ExecutionEngine *engine, const Value &object, uint idx)
@@ -656,7 +604,7 @@ static Q_NEVER_INLINE ReturnedValue getElementFallback(ExecutionEngine *engine,
     return o->get(name);
 }
 
-ReturnedValue Runtime::method_getElement(ExecutionEngine *engine, const Value &object, const Value &index)
+ReturnedValue Runtime::method_loadElement(ExecutionEngine *engine, const Value &object, const Value &index)
 {
     uint idx;
     if (index.asArrayIndex(idx)) {
@@ -677,12 +625,12 @@ ReturnedValue Runtime::method_getElement(ExecutionEngine *engine, const Value &o
     return getElementFallback(engine, object, index);
 }
 
-static Q_NEVER_INLINE void setElementFallback(ExecutionEngine *engine, const Value &object, const Value &index, const Value &value)
+static Q_NEVER_INLINE bool setElementFallback(ExecutionEngine *engine, const Value &object, const Value &index, const Value &value)
 {
     Scope scope(engine);
     ScopedObject o(scope, object.toObject(engine));
     if (engine->hasException)
-        return;
+        return false;
 
     uint idx;
     if (index.asArrayIndex(idx)) {
@@ -690,18 +638,17 @@ static Q_NEVER_INLINE void setElementFallback(ExecutionEngine *engine, const Val
             Heap::SimpleArrayData *s = o->d()->arrayData.cast<Heap::SimpleArrayData>();
             if (idx < s->values.size) {
                 s->setData(engine, idx, value);
-                return;
+                return true;
             }
         }
-        o->putIndexed(idx, value);
-        return;
+        return o->putIndexed(idx, value);
     }
 
     ScopedString name(scope, index.toString(engine));
-    o->put(name, value);
+    return o->put(name, value);
 }
 
-void Runtime::method_setElement(ExecutionEngine *engine, const Value &object, const Value &index, const Value &value)
+bool Runtime::method_storeElement(ExecutionEngine *engine, const Value &object, const Value &index, const Value &value)
 {
     uint idx;
     if (index.asArrayIndex(idx)) {
@@ -712,7 +659,7 @@ void Runtime::method_setElement(ExecutionEngine *engine, const Value &object, co
                     Heap::SimpleArrayData *s = o->arrayData.cast<Heap::SimpleArrayData>();
                     if (idx < s->values.size) {
                         s->setData(engine, idx, value);
-                        return;
+                        return true;
                     }
                 }
             }
@@ -742,17 +689,31 @@ ReturnedValue Runtime::method_foreachNextPropertyName(const Value &foreach_itera
 }
 
 
-void Runtime::method_setActivationProperty(ExecutionEngine *engine, int nameIndex, const Value &value)
+void Runtime::method_storeNameSloppy(ExecutionEngine *engine, int nameIndex, const Value &value)
+{
+    Scope scope(engine);
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
+    ExecutionContext::Error e = static_cast<ExecutionContext &>(engine->currentStackFrame->jsFrame->context).setProperty(name, value);
+
+    if (e == ExecutionContext::RangeError)
+        engine->globalObject->put(name, value);
+}
+
+void Runtime::method_storeNameStrict(ExecutionEngine *engine, int nameIndex, const Value &value)
 {
     Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
-    engine->currentContext->setProperty(name, value);
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
+    ExecutionContext::Error e = static_cast<ExecutionContext &>(engine->currentStackFrame->jsFrame->context).setProperty(name, value);
+    if (e == ExecutionContext::TypeError)
+        engine->throwTypeError();
+    else if (e == ExecutionContext::RangeError)
+        engine->throwReferenceError(name);
 }
 
-ReturnedValue Runtime::method_getProperty(ExecutionEngine *engine, const Value &object, int nameIndex)
+ReturnedValue Runtime::method_loadProperty(ExecutionEngine *engine, const Value &object, int nameIndex)
 {
     Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
 
     ScopedObject o(scope, object);
     if (o)
@@ -769,11 +730,11 @@ ReturnedValue Runtime::method_getProperty(ExecutionEngine *engine, const Value &
     return o->get(name);
 }
 
-ReturnedValue Runtime::method_getActivationProperty(ExecutionEngine *engine, int nameIndex)
+ReturnedValue Runtime::method_loadName(ExecutionEngine *engine, int nameIndex)
 {
     Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
-    return engine->currentContext->getProperty(name);
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
+    return static_cast<ExecutionContext &>(engine->currentStackFrame->jsFrame->context).getProperty(name);
 }
 
 #endif // V4_BOOTSTRAP
@@ -1002,233 +963,142 @@ uint Runtime::method_compareIn(ExecutionEngine *engine, const Value &left, const
 }
 
 
-ReturnedValue Runtime::method_callGlobalLookup(ExecutionEngine *engine, uint index, CallData *callData)
+ReturnedValue Runtime::method_callGlobalLookup(ExecutionEngine *engine, uint index, Value *argv, int argc)
 {
-    Scope scope(engine);
-    Q_ASSERT(callData->thisObject.isUndefined());
-
-    Lookup *l = engine->current->lookups + index;
-    ScopedFunctionObject o(scope, l->globalGetter(l, engine));
-    if (!o)
+    Lookup *l = engine->currentStackFrame->v4Function->compilationUnit->runtimeLookups + index;
+    Value function = Value::fromReturnedValue(l->globalGetter(l, engine));
+    if (!function.isFunctionObject())
         return engine->throwTypeError();
 
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[l->nameIndex]);
-    if (o->d() == scope.engine->evalFunction()->d() && name->equals(scope.engine->id_eval())) {
-        static_cast<EvalFunction *>(o.getPointer())->evalCall(scope, callData, true);
-    } else {
-        o->call(scope, callData);
-    }
-
-    return scope.result.asReturnedValue();
+    Value thisObject = Primitive::undefinedValue();
+    return static_cast<FunctionObject &>(function).call(&thisObject, argv, argc);
 }
 
-
-ReturnedValue Runtime::method_callActivationProperty(ExecutionEngine *engine, int nameIndex, CallData *callData)
+ReturnedValue Runtime::method_callPossiblyDirectEval(ExecutionEngine *engine, Value *argv, int argc)
 {
-    Q_ASSERT(callData->thisObject.isUndefined());
     Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
+    ScopedValue thisObject(scope);
 
-    ScopedObject base(scope);
-    ScopedValue func(scope, engine->currentContext->getPropertyAndBase(name, base.getRef()));
-    if (scope.engine->hasException)
+    ExecutionContext &ctx = static_cast<ExecutionContext &>(engine->currentStackFrame->jsFrame->context);
+    ScopedFunctionObject function(scope, ctx.getPropertyAndBase(engine->id_eval(), thisObject));
+    if (engine->hasException)
         return Encode::undefined();
 
-    if (base)
-        callData->thisObject = base;
-
-    FunctionObject *o = func->as<FunctionObject>();
-    if (!o) {
+    if (!function) {
         QString objectAsString = QStringLiteral("[null]");
-        if (base)
-            objectAsString = ScopedValue(scope, base.asReturnedValue())->toQStringNoThrow();
-        QString msg = QStringLiteral("Property '%1' of object %2 is not a function").arg(name->toQString()).arg(objectAsString);
+        if (!thisObject->isUndefined())
+            objectAsString = thisObject->toQStringNoThrow();
+        QString msg = QStringLiteral("Property 'eval' of object %2 is not a function").arg(objectAsString);
         return engine->throwTypeError(msg);
     }
 
-    if (o->d() == scope.engine->evalFunction()->d() && name->equals(scope.engine->id_eval())) {
-        static_cast<EvalFunction *>(o)->evalCall(scope, callData, true);
-    } else {
-        o->call(scope, callData);
-    }
+    if (function->d() == engine->evalFunction()->d())
+        return static_cast<EvalFunction *>(function.getPointer())->evalCall(thisObject, argv, argc, true);
 
-    return scope.result.asReturnedValue();
+    return function->call(thisObject, argv, argc);
 }
 
-ReturnedValue Runtime::method_callQmlScopeObjectProperty(ExecutionEngine *engine, int propertyIndex, CallData *callData)
+ReturnedValue Runtime::method_callName(ExecutionEngine *engine, int nameIndex, Value *argv, int argc)
 {
     Scope scope(engine);
-    ScopedFunctionObject o(scope, method_getQmlScopeObjectProperty(engine, callData->thisObject, propertyIndex, /*captureRequired*/true));
-    if (!o) {
-        QString error = QStringLiteral("Property '%1' of scope object is not a function").arg(propertyIndex);
-        return engine->throwTypeError(error);
-    }
+    ScopedValue thisObject(scope);
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
 
-    o->call(scope, callData);
-    return scope.result.asReturnedValue();
-}
+    ExecutionContext &ctx = static_cast<ExecutionContext &>(engine->currentStackFrame->jsFrame->context);
+    ScopedFunctionObject f(scope, ctx.getPropertyAndBase(name, thisObject));
+    if (engine->hasException)
+        return Encode::undefined();
 
-ReturnedValue Runtime::method_callQmlContextObjectProperty(ExecutionEngine *engine, int propertyIndex, CallData *callData)
-{
-    Scope scope(engine);
-    ScopedFunctionObject o(scope, method_getQmlContextObjectProperty(engine, callData->thisObject, propertyIndex, /*captureRequired*/true));
-    if (!o) {
-        QString error = QStringLiteral("Property '%1' of context object is not a function").arg(propertyIndex);
-        return engine->throwTypeError(error);
+    if (!f) {
+        QString objectAsString = QStringLiteral("[null]");
+        if (!thisObject->isUndefined())
+            objectAsString = thisObject->toQStringNoThrow();
+        QString msg = QStringLiteral("Property '%1' of object %2 is not a function")
+                .arg(engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]->toQString(),
+                     objectAsString);
+        return engine->throwTypeError(msg);
     }
 
-    o->call(scope, callData);
-    return scope.result.asReturnedValue();
+    return f->call(thisObject, argv, argc);
 }
 
-ReturnedValue Runtime::method_callProperty(ExecutionEngine *engine, int nameIndex, CallData *callData)
+ReturnedValue Runtime::method_callProperty(ExecutionEngine *engine, Value *base, int nameIndex, Value *argv, int argc)
 {
     Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
-    ScopedObject baseObject(scope, callData->thisObject);
-    if (!baseObject) {
-        Q_ASSERT(!callData->thisObject.isEmpty());
-        if (callData->thisObject.isNullOrUndefined()) {
-            QString message = QStringLiteral("Cannot call method '%1' of %2").arg(name->toQString()).arg(callData->thisObject.toQStringNoThrow());
+
+    if (!base->isObject()) {
+        Q_ASSERT(!base->isEmpty());
+        if (base->isNullOrUndefined()) {
+            QString message = QStringLiteral("Cannot call method '%1' of %2")
+                    .arg(engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]->toQString(),
+                         base->toQStringNoThrow());
             return engine->throwTypeError(message);
         }
 
-        baseObject = RuntimeHelpers::convertToObject(scope.engine, callData->thisObject);
-        if (!baseObject) // type error
+        ScopedValue thisObject(scope, RuntimeHelpers::convertToObject(engine, *base));
+        if (engine->hasException) // type error
             return Encode::undefined();
-        callData->thisObject = baseObject.asReturnedValue();
+        base = thisObject;
     }
 
-    ScopedFunctionObject o(scope, baseObject->get(name));
-    if (o) {
-        o->call(scope, callData);
-        return scope.result.asReturnedValue();
-    } else {
-        QString error = QStringLiteral("Property '%1' of object %2 is not a function").arg(name->toQString(), callData->thisObject.toQStringNoThrow());
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
+    ScopedFunctionObject f(scope, static_cast<Object *>(base)->get(name));
+
+    if (!f) {
+        QString error = QStringLiteral("Property '%1' of object %2 is not a function")
+                .arg(engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]->toQString(),
+                     base->toQStringNoThrow());
         return engine->throwTypeError(error);
     }
 
+    return f->call(base, argv, argc);
 }
 
-ReturnedValue Runtime::method_callPropertyLookup(ExecutionEngine *engine, uint index, CallData *callData)
-{
-    Lookup *l = engine->current->lookups + index;
-    Value v;
-    v = l->getter(l, engine, callData->thisObject);
-    Object *o = v.objectValue();
-    if (Q_LIKELY(o)) {
-        Scope scope(engine);
-        o->call(scope, callData);
-        return scope.result.asReturnedValue();
-    }
-    return engine->throwTypeError();
-}
-
-ReturnedValue Runtime::method_callElement(ExecutionEngine *engine, const Value &index, CallData *callData)
+ReturnedValue Runtime::method_callPropertyLookup(ExecutionEngine *engine, Value *base, uint index, Value *argv, int argc)
 {
-    Scope scope(engine);
-    ScopedObject baseObject(scope, callData->thisObject.toObject(engine));
-    ScopedString s(scope, index.toString(engine));
-
-    if (scope.engine->hasException)
-        return Encode::undefined();
-    callData->thisObject = baseObject;
+    Lookup *l = engine->currentStackFrame->v4Function->compilationUnit->runtimeLookups + index;
+    // ok to have the value on the stack here
+    Value f = Value::fromReturnedValue(l->getter(l, engine, *base));
 
-    ScopedObject o(scope, baseObject->get(s));
-    if (!o)
+    if (!f.isFunctionObject())
         return engine->throwTypeError();
 
-    o->call(scope, callData);
-    return scope.result.asReturnedValue();
-}
-
-ReturnedValue Runtime::method_callValue(ExecutionEngine *engine, const Value &func, CallData *callData)
-{
-    if (Object *o = func.objectValue()) {
-        Scope scope(engine);
-        o->call(scope, callData);
-        return scope.result.asReturnedValue();
-    }
-    return engine->throwTypeError(QStringLiteral("%1 is not a function").arg(func.toQStringNoThrow()));
+    return static_cast<FunctionObject &>(f).call(base, argv, argc);
 }
 
-
-ReturnedValue Runtime::method_constructGlobalLookup(ExecutionEngine *engine, uint index, CallData *callData)
+ReturnedValue Runtime::method_callElement(ExecutionEngine *engine, Value *base, const Value &index, Value *argv, int argc)
 {
     Scope scope(engine);
-    Q_ASSERT(callData->thisObject.isUndefined());
-
-    Lookup *l = engine->current->lookups + index;
-    ScopedObject f(scope, l->globalGetter(l, engine));
-    if (f) {
-        f->construct(scope, callData);
-        return scope.result.asReturnedValue();
-    } else {
-        return engine->throwTypeError();
-    }
-}
-
+    ScopedValue thisObject(scope, base->toObject(engine));
+    base = thisObject;
 
-ReturnedValue Runtime::method_constructActivationProperty(ExecutionEngine *engine, int nameIndex, CallData *callData)
-{
-    Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
-    ScopedValue func(scope, engine->currentContext->getProperty(name));
-    if (scope.engine->hasException)
+    ScopedString str(scope, index.toString(engine));
+    if (engine->hasException)
         return Encode::undefined();
 
-    Object *f = func->as<Object>();
+    ScopedFunctionObject f(scope, static_cast<Object *>(base)->get(str));
     if (!f)
         return engine->throwTypeError();
 
-    f->construct(scope, callData);
-    return scope.result.asReturnedValue();
+    return f->call(base, argv, argc);
 }
 
-ReturnedValue Runtime::method_constructValue(ExecutionEngine *engine, const Value &func, CallData *callData)
+ReturnedValue Runtime::method_callValue(ExecutionEngine *engine, const Value &func, Value *argv, int argc)
 {
-    const Object *f = func.as<Object>();
-    if (!f)
-        return engine->throwTypeError();
-
-    Scope scope(engine);
-    f->construct(scope, callData);
-    return scope.result.asReturnedValue();
+    if (!func.isFunctionObject())
+        return engine->throwTypeError(QStringLiteral("%1 is not a function").arg(func.toQStringNoThrow()));
+    return static_cast<const FunctionObject &>(func).call(nullptr, argv, argc);
 }
 
-ReturnedValue Runtime::method_constructProperty(ExecutionEngine *engine, int nameIndex, CallData *callData)
-{
-    Scope scope(engine);
-    ScopedObject thisObject(scope, callData->thisObject.toObject(engine));
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
-    if (scope.engine->hasException)
-        return Encode::undefined();
 
-    ScopedObject f(scope, thisObject->get(name));
-    if (f) {
-        Scope scope(engine);
-        f->construct(scope, callData);
-        return scope.result.asReturnedValue();
-    } else {
+ReturnedValue Runtime::method_construct(ExecutionEngine *engine, const Value &function, Value *argv, int argc)
+{
+    if (!function.isFunctionObject())
         return engine->throwTypeError();
-    }
-}
 
-ReturnedValue Runtime::method_constructPropertyLookup(ExecutionEngine *engine, uint index, CallData *callData)
-{
-    Lookup *l = engine->current->lookups + index;
-    Value v;
-    v = l->getter(l, engine, callData->thisObject);
-    Object *o = v.objectValue();
-    if (Q_LIKELY(o)) {
-        Scope scope(engine);
-        o->construct(scope, callData);
-        return scope.result.asReturnedValue();
-    }
-    return engine->throwTypeError();
+    return static_cast<const FunctionObject &>(function).callAsConstructor(argv, argc);
 }
 
-
 void Runtime::method_throwException(ExecutionEngine *engine, const Value &value)
 {
     if (!value.isEmpty())
@@ -1267,96 +1137,37 @@ ReturnedValue Runtime::method_typeofValue(ExecutionEngine *engine, const Value &
 QV4::ReturnedValue Runtime::method_typeofName(ExecutionEngine *engine, int nameIndex)
 {
     Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
-    ScopedValue prop(scope, engine->currentContext->getProperty(name));
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
+    ScopedValue prop(scope, static_cast<ExecutionContext &>(engine->currentStackFrame->jsFrame->context).getProperty(name));
     // typeof doesn't throw. clear any possible exception
     scope.engine->hasException = false;
     return method_typeofValue(engine, prop);
 }
 
-#ifndef V4_BOOTSTRAP
-ReturnedValue Runtime::method_typeofScopeObjectProperty(ExecutionEngine *engine, const Value &context, int propertyIndex)
-{
-    Scope scope(engine);
-    ScopedValue prop(scope, method_getQmlScopeObjectProperty(engine, context, propertyIndex, /*captureRequired*/true));
-    if (scope.engine->hasException)
-        return Encode::undefined();
-    return method_typeofValue(engine, prop);
-}
-
-ReturnedValue Runtime::method_typeofContextObjectProperty(ExecutionEngine *engine, const Value &context, int propertyIndex)
-{
-    Scope scope(engine);
-    ScopedValue prop(scope, method_getQmlContextObjectProperty(engine, context, propertyIndex, /*captureRequired*/true));
-    if (scope.engine->hasException)
-        return Encode::undefined();
-    return method_typeofValue(engine, prop);
-}
-#endif // V4_BOOTSTRAP
-
-QV4::ReturnedValue Runtime::method_typeofMember(ExecutionEngine *engine, const Value &base, int nameIndex)
-{
-    Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
-    ScopedObject obj(scope, base.toObject(engine));
-    if (scope.engine->hasException)
-        return Encode::undefined();
-    ScopedValue prop(scope, obj->get(name));
-    return method_typeofValue(engine, prop);
-}
-
-QV4::ReturnedValue Runtime::method_typeofElement(ExecutionEngine *engine, const Value &base, const Value &index)
-{
-    Scope scope(engine);
-    ScopedString name(scope, index.toString(engine));
-    ScopedObject obj(scope, base.toObject(engine));
-    if (scope.engine->hasException)
-        return Encode::undefined();
-    ScopedValue prop(scope, obj->get(name));
-    return method_typeofValue(engine, prop);
-}
-
-ReturnedValue Runtime::method_unwindException(ExecutionEngine *engine)
-{
-    if (!engine->hasException)
-        return Primitive::emptyValue().asReturnedValue();
-    return engine->catchException(0);
-}
-
 /* The next three methods are a bit tricky. They can't open up a Scope, as that
  * would mess up the pushing of the context.
  *
  * Instead the push/pop pair acts as a non local scope.
  */
-void Runtime::method_pushWithScope(const Value &o, NoThrowEngine *engine)
-{
-    QV4::Value *v = engine->jsAlloca(1);
-    Heap::Object *withObject = o.toObject(engine);
-    *v = withObject;
-    engine->pushContext(engine->currentContext->newWithContext(withObject));
-    Q_ASSERT(engine->jsStackTop == engine->currentContext + 2);
-}
-
-void Runtime::method_pushCatchScope(NoThrowEngine *engine, int exceptionVarNameIndex)
+ReturnedValue Runtime::method_createWithContext(ExecutionContext *parent, const Value &o)
 {
-    engine->jsAlloca(1); // keep this symmetric with pushWithScope
-    ExecutionContext *c = engine->currentContext;
-    engine->pushContext(c->newCatchContext(c->d()->compilationUnit->runtimeStrings[exceptionVarNameIndex], engine->catchException(0)));
-    Q_ASSERT(engine->jsStackTop == engine->currentContext + 2);
+    Q_ASSERT(o.isObject());
+    const Object &obj = static_cast<const Object &>(o);
+    return parent->newWithContext(obj.d())->asReturnedValue();
 }
 
-void Runtime::method_popScope(NoThrowEngine *engine)
+ReturnedValue Runtime::method_createCatchContext(ExecutionContext *parent, int exceptionVarNameIndex)
 {
-    Q_ASSERT(engine->jsStackTop == engine->currentContext + 2);
-    engine->popContext();
-    engine->jsStackTop -= 3;
+    ExecutionEngine *e = parent->engine();
+    return parent->newCatchContext(e->currentStackFrame->v4Function->compilationUnit->runtimeStrings[exceptionVarNameIndex],
+                                   e->catchException(0))->asReturnedValue();
 }
 
 void Runtime::method_declareVar(ExecutionEngine *engine, bool deletable, int nameIndex)
 {
     Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
-    engine->currentContext->createMutableBinding(name, deletable);
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
+    static_cast<ExecutionContext &>(engine->currentStackFrame->jsFrame->context).createMutableBinding(name, deletable);
 }
 
 ReturnedValue Runtime::method_arrayLiteral(ExecutionEngine *engine, Value *values, uint length)
@@ -1367,7 +1178,7 @@ ReturnedValue Runtime::method_arrayLiteral(ExecutionEngine *engine, Value *value
 ReturnedValue Runtime::method_objectLiteral(ExecutionEngine *engine, const QV4::Value *args, int classId, int arrayValueCount, int arrayGetterSetterCountAndFlags)
 {
     Scope scope(engine);
-    QV4::InternalClass *klass = static_cast<CompiledData::CompilationUnit*>(engine->current->compilationUnit)->runtimeClasses[classId];
+    QV4::InternalClass *klass = static_cast<CompiledData::CompilationUnit*>(engine->currentStackFrame->v4Function->compilationUnit)->runtimeClasses[classId];
     ScopedObject o(scope, engine->newObject(klass, engine->objectPrototype()));
 
     {
@@ -1406,134 +1217,46 @@ ReturnedValue Runtime::method_objectLiteral(ExecutionEngine *engine, const QV4::
     return o.asReturnedValue();
 }
 
-QV4::ReturnedValue Runtime::method_setupArgumentsObject(ExecutionEngine *engine)
+QV4::ReturnedValue Runtime::method_createMappedArgumentsObject(ExecutionEngine *engine)
 {
-    Q_ASSERT(engine->current->type == Heap::ExecutionContext::Type_CallContext);
-    QV4::CallContext *c = static_cast<QV4::CallContext *>(engine->currentContext);
-    QV4::InternalClass *ic = engine->internalClasses[c->d()->strictMode ? EngineBase::Class_StrictArgumentsObject : EngineBase::Class_ArgumentsObject];
-    return engine->memoryManager->allocObject<ArgumentsObject>(ic, engine->objectPrototype(), c)->asReturnedValue();
+    Q_ASSERT(engine->currentContext()->d()->type == Heap::ExecutionContext::Type_CallContext);
+    QV4::InternalClass *ic = engine->internalClasses[EngineBase::Class_ArgumentsObject];
+    return engine->memoryManager->allocObject<ArgumentsObject>(ic, engine->objectPrototype(), engine->currentStackFrame)->asReturnedValue();
 }
 
-#endif // V4_BOOTSTRAP
-
-QV4::ReturnedValue Runtime::method_increment(const Value &value)
+QV4::ReturnedValue Runtime::method_createUnmappedArgumentsObject(ExecutionEngine *engine)
 {
-    TRACE1(value);
-
-    if (value.isInteger() && value.integerValue() < INT_MAX)
-        return Encode(value.integerValue() + 1);
-    else {
-        double d = value.toNumber();
-        return Encode(d + 1.);
-    }
-}
-
-QV4::ReturnedValue Runtime::method_decrement(const Value &value)
-{
-    TRACE1(value);
-
-    if (value.isInteger() && value.integerValue() > INT_MIN)
-        return Encode(value.integerValue() - 1);
-    else {
-        double d = value.toNumber();
-        return Encode(d - 1.);
-    }
-}
-
-ReturnedValue Runtime::method_toDouble(const Value &value)
-{
-    TRACE1(value);
-    return Encode(value.toNumber());
-}
-
-int Runtime::method_toInt(const Value &value)
-{
-    TRACE1(value);
-    return value.toInt32();
-}
-
-int Runtime::method_doubleToInt(const double &d)
-{
-    TRACE0();
-    return Primitive::toInt32(d);
-}
-
-unsigned Runtime::method_toUInt(const Value &value)
-{
-    TRACE1(value);
-    return value.toUInt32();
-}
-
-unsigned Runtime::method_doubleToUInt(const double &d)
-{
-    TRACE0();
-    return Primitive::toUInt32(d);
+    QV4::InternalClass *ic = engine->internalClasses[EngineBase::Class_StrictArgumentsObject];
+    return engine->memoryManager->allocObject<StrictArgumentsObject>(ic, engine->objectPrototype(), engine->currentStackFrame)->asReturnedValue();
 }
 
-#ifndef V4_BOOTSTRAP
-
-ReturnedValue Runtime::method_getQmlContext(NoThrowEngine *engine)
+ReturnedValue Runtime::method_loadQmlContext(NoThrowEngine *engine)
 {
     return engine->qmlContext()->asReturnedValue();
 }
 
 ReturnedValue Runtime::method_regexpLiteral(ExecutionEngine *engine, int id)
 {
-    Heap::RegExpObject *ro = engine->newRegExpObject(
-            static_cast<CompiledData::CompilationUnit*>(engine->current->compilationUnit)
-                    ->runtimeRegularExpressions[id].as<RegExp>());
+    Heap::RegExpObject *ro = engine->newRegExpObject(engine->currentStackFrame->v4Function->compilationUnit->runtimeRegularExpressions[id].as<RegExp>());
     return ro->asReturnedValue();
 }
 
-ReturnedValue Runtime::method_getQmlQObjectProperty(ExecutionEngine *engine, const Value &object, int propertyIndex, bool captureRequired)
-{
-    Scope scope(engine);
-    QV4::Scoped<QObjectWrapper> wrapper(scope, object);
-    if (!wrapper) {
-        engine->throwTypeError(QStringLiteral("Cannot read property of null"));
-        return Encode::undefined();
-    }
-    return QV4::QObjectWrapper::getProperty(scope.engine, wrapper->object(), propertyIndex, captureRequired);
-}
-
-QV4::ReturnedValue Runtime::method_getQmlAttachedProperty(ExecutionEngine *engine, int attachedPropertiesId, int propertyIndex)
-{
-    QObject *scopeObject = engine->qmlScopeObject();
-    QObject *attachedObject = qmlAttachedPropertiesObjectById(attachedPropertiesId, scopeObject);
-
-    QJSEngine *jsEngine = engine->jsEngine();
-    QQmlData::ensurePropertyCache(jsEngine, attachedObject);
-    return QV4::QObjectWrapper::getProperty(engine, attachedObject, propertyIndex, /*captureRequired*/true);
-}
-
-ReturnedValue Runtime::method_getQmlScopeObjectProperty(ExecutionEngine *engine, const Value &context, int propertyIndex, bool captureRequired)
+ReturnedValue Runtime::method_loadQmlScopeObjectProperty(ExecutionEngine *engine, const Value &context, int propertyIndex, bool captureRequired)
 {
     const QmlContext &c = static_cast<const QmlContext &>(context);
-    return QV4::QObjectWrapper::getProperty(engine, c.d()->qml->scopeObject, propertyIndex, captureRequired);
+    return QV4::QObjectWrapper::getProperty(engine, c.d()->qml()->scopeObject, propertyIndex, captureRequired);
 }
 
-ReturnedValue Runtime::method_getQmlContextObjectProperty(ExecutionEngine *engine, const Value &context, int propertyIndex, bool captureRequired)
+ReturnedValue Runtime::method_loadQmlContextObjectProperty(ExecutionEngine *engine, const Value &context, int propertyIndex, bool captureRequired)
 {
     const QmlContext &c = static_cast<const QmlContext &>(context);
-    return QV4::QObjectWrapper::getProperty(engine, (*c.d()->qml->context)->contextObject, propertyIndex, captureRequired);
-}
-
-ReturnedValue Runtime::method_getQmlSingletonQObjectProperty(ExecutionEngine *engine, const Value &object, int propertyIndex, bool captureRequired)
-{
-    Scope scope(engine);
-    QV4::Scoped<QQmlTypeWrapper> wrapper(scope, object);
-    if (!wrapper) {
-        scope.engine->throwTypeError(QStringLiteral("Cannot read property of null"));
-        return Encode::undefined();
-    }
-    return QV4::QObjectWrapper::getProperty(scope.engine, wrapper->singletonObject(), propertyIndex, captureRequired);
+    return QV4::QObjectWrapper::getProperty(engine, (*c.d()->qml()->context)->contextObject, propertyIndex, captureRequired);
 }
 
-ReturnedValue Runtime::method_getQmlIdObject(ExecutionEngine *engine, const Value &c, uint index)
+ReturnedValue Runtime::method_loadQmlIdObject(ExecutionEngine *engine, const Value &c, uint index)
 {
-    Scope scope(engine);
     const QmlContext &qmlContext = static_cast<const QmlContext &>(c);
-    QQmlContextData *context = *qmlContext.d()->qml->context;
+    QQmlContextData *context = *qmlContext.d()->qml()->context;
     if (!context || index >= (uint)context->idValueCount)
         return Encode::undefined();
 
@@ -1544,30 +1267,19 @@ ReturnedValue Runtime::method_getQmlIdObject(ExecutionEngine *engine, const Valu
     return QObjectWrapper::wrap(engine, context->idValues[index].data());
 }
 
-void Runtime::method_setQmlScopeObjectProperty(ExecutionEngine *engine, const Value &context, int propertyIndex, const Value &value)
+void Runtime::method_storeQmlScopeObjectProperty(ExecutionEngine *engine, const Value &context, int propertyIndex, const Value &value)
 {
     const QmlContext &c = static_cast<const QmlContext &>(context);
-    return QV4::QObjectWrapper::setProperty(engine, c.d()->qml->scopeObject, propertyIndex, value);
+    return QV4::QObjectWrapper::setProperty(engine, c.d()->qml()->scopeObject, propertyIndex, value);
 }
 
-void Runtime::method_setQmlContextObjectProperty(ExecutionEngine *engine, const Value &context, int propertyIndex, const Value &value)
+void Runtime::method_storeQmlContextObjectProperty(ExecutionEngine *engine, const Value &context, int propertyIndex, const Value &value)
 {
     const QmlContext &c = static_cast<const QmlContext &>(context);
-    return QV4::QObjectWrapper::setProperty(engine, (*c.d()->qml->context)->contextObject, propertyIndex, value);
+    return QV4::QObjectWrapper::setProperty(engine, (*c.d()->qml()->context)->contextObject, propertyIndex, value);
 }
 
-void Runtime::method_setQmlQObjectProperty(ExecutionEngine *engine, const Value &object, int propertyIndex, const Value &value)
-{
-    Scope scope(engine);
-    QV4::Scoped<QObjectWrapper> wrapper(scope, object);
-    if (!wrapper) {
-        engine->throwTypeError(QStringLiteral("Cannot write property of null"));
-        return;
-    }
-    wrapper->setProperty(engine, propertyIndex, value);
-}
-
-ReturnedValue Runtime::method_getQmlImportedScripts(NoThrowEngine *engine)
+ReturnedValue Runtime::method_loadQmlImportedScripts(NoThrowEngine *engine)
 {
     QQmlContextData *context = engine->callingQmlContext();
     if (!context)
@@ -1575,44 +1287,20 @@ ReturnedValue Runtime::method_getQmlImportedScripts(NoThrowEngine *engine)
     return context->importedScripts.value();
 }
 
-QV4::ReturnedValue Runtime::method_getQmlSingleton(QV4::NoThrowEngine *engine, int nameIndex)
+QV4::ReturnedValue Runtime::method_loadQmlSingleton(QV4::NoThrowEngine *engine, int nameIndex)
 {
     Scope scope(engine);
-    ScopedString name(scope, engine->current->compilationUnit->runtimeStrings[nameIndex]);
+    ScopedString name(scope, engine->currentStackFrame->v4Function->compilationUnit->runtimeStrings[nameIndex]);
     return engine->qmlSingletonWrapper(name);
 }
 
-void Runtime::method_convertThisToObject(ExecutionEngine *engine)
-{
-    Value *t = &engine->current->callData->thisObject;
-    if (t->isObject())
-        return;
-    if (t->isNullOrUndefined()) {
-        *t = engine->globalObject->asReturnedValue();
-    } else {
-        *t = t->toObject(engine)->asReturnedValue();
-    }
-}
-
-ReturnedValue Runtime::method_uPlus(const Value &value)
-{
-    TRACE1(value);
-
-    if (value.isNumber())
-        return value.asReturnedValue();
-    if (value.integerCompatible())
-        return Encode(value.int_32());
-
-    double n = value.toNumberImpl();
-    return Encode(n);
-}
-
 ReturnedValue Runtime::method_uMinus(const Value &value)
 {
     TRACE1(value);
 
     // +0 != -0, so we need to convert to double when negating 0
-    if (value.isInteger() && value.integerValue())
+    if (value.isInteger() && value.integerValue() &&
+            value.integerValue() != std::numeric_limits<int>::min())
         return Encode(-value.integerValue());
     else {
         double n = RuntimeHelpers::toNumber(value);
@@ -1620,56 +1308,14 @@ ReturnedValue Runtime::method_uMinus(const Value &value)
     }
 }
 
-ReturnedValue Runtime::method_complement(const Value &value)
-{
-    TRACE1(value);
-
-    int n = value.toInt32();
-    return Encode((int)~n);
-}
-
-ReturnedValue Runtime::method_uNot(const Value &value)
-{
-    TRACE1(value);
-
-    bool b = value.toBoolean();
-    return Encode(!b);
-}
-
 // binary operators
-ReturnedValue Runtime::method_bitOr(const Value &left, const Value &right)
-{
-    TRACE2(left, right);
-
-    int lval = left.toInt32();
-    int rval = right.toInt32();
-    return Encode(lval | rval);
-}
-
-ReturnedValue Runtime::method_bitXor(const Value &left, const Value &right)
-{
-    TRACE2(left, right);
-
-    int lval = left.toInt32();
-    int rval = right.toInt32();
-    return Encode(lval ^ rval);
-}
-
-ReturnedValue Runtime::method_bitAnd(const Value &left, const Value &right)
-{
-    TRACE2(left, right);
-
-    int lval = left.toInt32();
-    int rval = right.toInt32();
-    return Encode(lval & rval);
-}
 
 #ifndef V4_BOOTSTRAP
 ReturnedValue Runtime::method_add(ExecutionEngine *engine, const Value &left, const Value &right)
 {
     TRACE2(left, right);
 
-    if (Q_LIKELY(left.isInteger() && right.isInteger()))
+    if (Q_LIKELY(left.integerCompatible() && right.integerCompatible()))
         return add_int32(left.integerValue(), right.integerValue());
     if (left.isNumber() && right.isNumber())
         return Primitive::fromDouble(left.asDouble() + right.asDouble()).asReturnedValue();
@@ -1682,7 +1328,7 @@ ReturnedValue Runtime::method_sub(const Value &left, const Value &right)
 {
     TRACE2(left, right);
 
-    if (Q_LIKELY(left.isInteger() && right.isInteger()))
+    if (Q_LIKELY(left.integerCompatible() && right.integerCompatible()))
         return sub_int32(left.integerValue(), right.integerValue());
 
     double lval = left.isNumber() ? left.asDouble() : left.toNumberImpl();
@@ -1695,7 +1341,7 @@ ReturnedValue Runtime::method_mul(const Value &left, const Value &right)
 {
     TRACE2(left, right);
 
-    if (Q_LIKELY(left.isInteger() && right.isInteger()))
+    if (Q_LIKELY(left.integerCompatible() && right.integerCompatible()))
         return mul_int32(left.integerValue(), right.integerValue());
 
     double lval = left.isNumber() ? left.asDouble() : left.toNumberImpl();
@@ -1878,11 +1524,6 @@ Bool Runtime::method_compareStrictNotEqual(const Value &left, const Value &right
     return ! RuntimeHelpers::strictEqual(left, right);
 }
 
-Bool Runtime::method_toBoolean(const Value &value)
-{
-    return value.toBoolean();
-}
-
 } // namespace QV4
 
 QT_END_NAMESPACE
diff --git a/src/qml/jsruntime/qv4runtime_p.h b/src/qml/jsruntime/qv4runtime_p.h
index 0d787714cf..3a26c23990 100644
--- a/src/qml/jsruntime/qv4runtime_p.h
+++ b/src/qml/jsruntime/qv4runtime_p.h
@@ -83,8 +83,8 @@ private:
 };
 
 #  define TRACE0() RuntimeCounters::instance->count(Q_FUNC_INFO);
-#  define TRACE1(x) RuntimeCounters::instance->count(Q_FUNC_INFO, x->type());
-#  define TRACE2(x, y) RuntimeCounters::instance->count(Q_FUNC_INFO, x->type(), y->type());
+#  define TRACE1(x) RuntimeCounters::instance->count(Q_FUNC_INFO, x.type());
+#  define TRACE2(x, y) RuntimeCounters::instance->count(Q_FUNC_INFO, x.type(), y.type());
 #else
 #  define TRACE0()
 #  define TRACE1(x)
@@ -99,14 +99,14 @@ enum TypeHint {
 
 struct Q_QML_PRIVATE_EXPORT RuntimeHelpers {
     static ReturnedValue objectDefaultValue(const Object *object, int typeHint);
-    static ReturnedValue toPrimitive(const Value &value, int typeHint);
+    static ReturnedValue toPrimitive(const Value &value, TypeHint typeHint);
 
     static double stringToNumber(const QString &s);
     static Heap::String *stringFromNumber(ExecutionEngine *engine, double number);
     static double toNumber(const Value &value);
     static void numberToString(QString *result, double num, int radix = 10);
 
-    static Heap::String *convertToString(ExecutionEngine *engine, const Value &value);
+    static Heap::String *convertToString(ExecutionEngine *engine, Value value, TypeHint = STRING_HINT);
     static Heap::Object *convertToObject(ExecutionEngine *engine, const Value &value);
 
     static Bool equalHelper(const Value &x, const Value &y);
@@ -118,12 +118,11 @@ struct Q_QML_PRIVATE_EXPORT RuntimeHelpers {
 
 // type conversion and testing
 #ifndef V4_BOOTSTRAP
-inline ReturnedValue RuntimeHelpers::toPrimitive(const Value &value, int typeHint)
+inline ReturnedValue RuntimeHelpers::toPrimitive(const Value &value, TypeHint typeHint)
 {
-    const Object *o = value.as<Object>();
-    if (!o)
+    if (!value.isObject())
         return value.asReturnedValue();
-    return RuntimeHelpers::objectDefaultValue(o, typeHint);
+    return RuntimeHelpers::objectDefaultValue(&reinterpret_cast<const Object &>(value), typeHint);
 }
 #endif
 
diff --git a/src/qml/jsruntime/qv4runtimeapi_p.h b/src/qml/jsruntime/qv4runtimeapi_p.h
index 302facba06..ea31dfd08b 100644
--- a/src/qml/jsruntime/qv4runtimeapi_p.h
+++ b/src/qml/jsruntime/qv4runtimeapi_p.h
@@ -58,7 +58,6 @@ namespace QV4 {
 
 typedef uint Bool;
 struct NoThrowEngine;
-
 namespace {
 template <typename T>
 struct ExceptionCheck {
@@ -93,84 +92,64 @@ struct ExceptionCheck<void (*)(QV4::NoThrowEngine *, A, B, C)> {
 
 #define FOR_EACH_RUNTIME_METHOD(F) \
     /* call */ \
-    F(ReturnedValue, callGlobalLookup, (ExecutionEngine *engine, uint index, CallData *callData)) \
-    F(ReturnedValue, callActivationProperty, (ExecutionEngine *engine, int nameIndex, CallData *callData)) \
-    F(ReturnedValue, callQmlScopeObjectProperty, (ExecutionEngine *engine, int propertyIndex, CallData *callData)) \
-    F(ReturnedValue, callQmlContextObjectProperty, (ExecutionEngine *engine, int propertyIndex, CallData *callData)) \
-    F(ReturnedValue, callProperty, (ExecutionEngine *engine, int nameIndex, CallData *callData)) \
-    F(ReturnedValue, callPropertyLookup, (ExecutionEngine *engine, uint index, CallData *callData)) \
-    F(ReturnedValue, callElement, (ExecutionEngine *engine, const Value &index, CallData *callData)) \
-    F(ReturnedValue, callValue, (ExecutionEngine *engine, const Value &func, CallData *callData)) \
+    F(ReturnedValue, callGlobalLookup, (ExecutionEngine *engine, uint index, Value *argv, int argc)) \
+    F(ReturnedValue, callName, (ExecutionEngine *engine, int nameIndex, Value *argv, int argc)) \
+    F(ReturnedValue, callProperty, (ExecutionEngine *engine, Value *base, int nameIndex, Value *argv, int argc)) \
+    F(ReturnedValue, callPropertyLookup, (ExecutionEngine *engine, Value *base, uint index, Value *argv, int argc)) \
+    F(ReturnedValue, callElement, (ExecutionEngine *engine, Value *base, const Value &index, Value *argv, int argc)) \
+    F(ReturnedValue, callValue, (ExecutionEngine *engine, const Value &func, Value *argv, int argc)) \
+    F(ReturnedValue, callPossiblyDirectEval, (ExecutionEngine *engine, Value *argv, int argc)) \
     \
     /* construct */ \
-    F(ReturnedValue, constructGlobalLookup, (ExecutionEngine *engine, uint index, CallData *callData)) \
-    F(ReturnedValue, constructActivationProperty, (ExecutionEngine *engine, int nameIndex, CallData *callData)) \
-    F(ReturnedValue, constructProperty, (ExecutionEngine *engine, int nameIndex, CallData *callData)) \
-    F(ReturnedValue, constructPropertyLookup, (ExecutionEngine *engine, uint index, CallData *callData)) \
-    F(ReturnedValue, constructValue, (ExecutionEngine *engine, const Value &func, CallData *callData)) \
+    F(ReturnedValue, construct, (ExecutionEngine *engine, const Value &func, Value *argv, int argc)) \
     \
-    /* set & get */ \
-    F(void, setActivationProperty, (ExecutionEngine *engine, int nameIndex, const Value &value)) \
-    F(void, setProperty, (ExecutionEngine *engine, const Value &object, int nameIndex, const Value &value)) \
-    F(void, setElement, (ExecutionEngine *engine, const Value &object, const Value &index, const Value &value)) \
-    F(ReturnedValue, getProperty, (ExecutionEngine *engine, const Value &object, int nameIndex)) \
-    F(ReturnedValue, getActivationProperty, (ExecutionEngine *engine, int nameIndex)) \
-    F(ReturnedValue, getElement, (ExecutionEngine *engine, const Value &object, const Value &index)) \
+    /* load & store */ \
+    F(void, storeNameStrict, (ExecutionEngine *engine, int nameIndex, const Value &value)) \
+    F(void, storeNameSloppy, (ExecutionEngine *engine, int nameIndex, const Value &value)) \
+    F(bool, storeProperty, (ExecutionEngine *engine, const Value &object, int nameIndex, const Value &value)) \
+    F(bool, storeElement, (ExecutionEngine *engine, const Value &object, const Value &index, const Value &value)) \
+    F(ReturnedValue, loadProperty, (ExecutionEngine *engine, const Value &object, int nameIndex)) \
+    F(ReturnedValue, loadName, (ExecutionEngine *engine, int nameIndex)) \
+    F(ReturnedValue, loadElement, (ExecutionEngine *engine, const Value &object, const Value &index)) \
     \
     /* typeof */  \
     F(ReturnedValue, typeofValue, (ExecutionEngine *engine, const Value &val)) \
     F(ReturnedValue, typeofName, (ExecutionEngine *engine, int nameIndex)) \
-    F(ReturnedValue, typeofScopeObjectProperty, (ExecutionEngine *engine, const Value &context, int propertyIndex)) \
-    F(ReturnedValue, typeofContextObjectProperty, (ExecutionEngine *engine, const Value &context, int propertyIndex)) \
-    F(ReturnedValue, typeofMember, (ExecutionEngine *engine, const Value &base, int nameIndex)) \
-    F(ReturnedValue, typeofElement, (ExecutionEngine *engine, const Value &base, const Value &index)) \
     \
     /* delete */ \
-    F(ReturnedValue, deleteElement, (ExecutionEngine *engine, const Value &base, const Value &index)) \
-    F(ReturnedValue, deleteMember, (ExecutionEngine *engine, const Value &base, int nameIndex)) \
-    F(ReturnedValue, deleteMemberString, (ExecutionEngine *engine, const Value &base, String *name)) \
-    F(ReturnedValue, deleteName, (ExecutionEngine *engine, int nameIndex)) \
+    F(bool, deleteElement, (ExecutionEngine *engine, const Value &base, const Value &index)) \
+    F(bool, deleteMember, (ExecutionEngine *engine, const Value &base, int nameIndex)) \
+    F(bool, deleteMemberString, (ExecutionEngine *engine, const Value &base, String *name)) \
+    F(bool, deleteName, (ExecutionEngine *engine, int nameIndex)) \
     \
     /* exceptions & scopes */ \
     F(void, throwException, (ExecutionEngine *engine, const Value &value)) \
-    F(ReturnedValue, unwindException, (ExecutionEngine *engine)) \
-    F(void, pushWithScope, (const Value &o, NoThrowEngine *engine)) \
-    F(void, pushCatchScope, (NoThrowEngine *engine, int exceptionVarNameIndex)) \
-    F(void, popScope, (NoThrowEngine *engine)) \
+    F(ReturnedValue, createWithContext, (ExecutionContext *parent, const Value &o)) \
+    F(ReturnedValue, createCatchContext, (ExecutionContext *parent, int exceptionVarNameIndex)) \
     \
     /* closures */ \
     F(ReturnedValue, closure, (ExecutionEngine *engine, int functionId)) \
     \
     /* function header */ \
     F(void, declareVar, (ExecutionEngine *engine, bool deletable, int nameIndex)) \
-    F(ReturnedValue, setupArgumentsObject, (ExecutionEngine *engine)) \
-    F(void, convertThisToObject, (ExecutionEngine *engine)) \
+    F(ReturnedValue, createMappedArgumentsObject, (ExecutionEngine *engine)) \
+    F(ReturnedValue, createUnmappedArgumentsObject, (ExecutionEngine *engine)) \
     \
     /* literals */ \
     F(ReturnedValue, arrayLiteral, (ExecutionEngine *engine, Value *values, uint length)) \
     F(ReturnedValue, objectLiteral, (ExecutionEngine *engine, const Value *args, int classId, int arrayValueCount, int arrayGetterSetterCountAndFlags)) \
-    F(ReturnedValue, regexpLiteral, (ExecutionEngine *engine, int id)) \
     \
     /* foreach */ \
     F(ReturnedValue, foreachIterator, (ExecutionEngine *engine, const Value &in)) \
     F(ReturnedValue, foreachNextPropertyName, (const Value &foreach_iterator)) \
     \
     /* unary operators */ \
-    F(ReturnedValue, uPlus, (const Value &value)) \
     F(ReturnedValue, uMinus, (const Value &value)) \
-    F(ReturnedValue, uNot, (const Value &value)) \
-    F(ReturnedValue, complement, (const Value &value)) \
-    F(ReturnedValue, increment, (const Value &value)) \
-    F(ReturnedValue, decrement, (const Value &value)) \
     \
     /* binary operators */ \
     F(ReturnedValue, instanceof, (ExecutionEngine *engine, const Value &left, const Value &right)) \
     F(ReturnedValue, in, (ExecutionEngine *engine, const Value &left, const Value &right)) \
     F(ReturnedValue, add, (ExecutionEngine *engine, const Value &left, const Value &right)) \
-    F(ReturnedValue, addString, (ExecutionEngine *engine, const Value &left, const Value &right)) \
-    F(ReturnedValue, bitOr, (const Value &left, const Value &right)) \
-    F(ReturnedValue, bitXor, (const Value &left, const Value &right)) \
-    F(ReturnedValue, bitAnd, (const Value &left, const Value &right)) \
     F(ReturnedValue, sub, (const Value &left, const Value &right)) \
     F(ReturnedValue, mul, (const Value &left, const Value &right)) \
     F(ReturnedValue, div, (const Value &left, const Value &right)) \
@@ -200,28 +179,18 @@ struct ExceptionCheck<void (*)(QV4::NoThrowEngine *, A, B, C)> {
     F(Bool, compareInstanceof, (ExecutionEngine *engine, const Value &left, const Value &right)) \
     F(Bool, compareIn, (ExecutionEngine *engine, const Value &left, const Value &right)) \
     \
-    /* conversions */ \
-    F(Bool, toBoolean, (const Value &value)) \
-    F(ReturnedValue, toDouble, (const Value &value)) \
-    F(int, toInt, (const Value &value)) \
-    F(int, doubleToInt, (const double &d)) \
-    F(unsigned, toUInt, (const Value &value)) \
-    F(unsigned, doubleToUInt, (const double &d)) \
+    F(ReturnedValue, regexpLiteral, (ExecutionEngine *engine, int id)) \
     \
     /* qml */ \
-    F(ReturnedValue, getQmlContext, (NoThrowEngine *engine)) \
-    F(ReturnedValue, getQmlImportedScripts, (NoThrowEngine *engine)) \
-    F(ReturnedValue, getQmlSingleton, (NoThrowEngine *engine, int nameIndex)) \
-    F(ReturnedValue, getQmlAttachedProperty, (ExecutionEngine *engine, int attachedPropertiesId, int propertyIndex)) \
-    F(ReturnedValue, getQmlScopeObjectProperty, (ExecutionEngine *engine, const Value &context, int propertyIndex, bool captureRequired)) \
-    F(ReturnedValue, getQmlContextObjectProperty, (ExecutionEngine *engine, const Value &context, int propertyIndex, bool captureRequired)) \
-    F(ReturnedValue, getQmlQObjectProperty, (ExecutionEngine *engine, const Value &object, int propertyIndex, bool captureRequired)) \
-    F(ReturnedValue, getQmlSingletonQObjectProperty, (ExecutionEngine *engine, const Value &object, int propertyIndex, bool captureRequired)) \
-    F(ReturnedValue, getQmlIdObject, (ExecutionEngine *engine, const Value &context, uint index)) \
-    \
-    F(void, setQmlScopeObjectProperty, (ExecutionEngine *engine, const Value &context, int propertyIndex, const Value &value)) \
-    F(void, setQmlContextObjectProperty, (ExecutionEngine *engine, const Value &context, int propertyIndex, const Value &value)) \
-    F(void, setQmlQObjectProperty, (ExecutionEngine *engine, const Value &object, int propertyIndex, const Value &value))
+    F(ReturnedValue, loadQmlContext, (NoThrowEngine *engine)) \
+    F(ReturnedValue, loadQmlImportedScripts, (NoThrowEngine *engine)) \
+    F(ReturnedValue, loadQmlSingleton, (NoThrowEngine *engine, int nameIndex)) \
+    F(ReturnedValue, loadQmlScopeObjectProperty, (ExecutionEngine *engine, const Value &context, int propertyIndex, bool captureRequired)) \
+    F(ReturnedValue, loadQmlContextObjectProperty, (ExecutionEngine *engine, const Value &context, int propertyIndex, bool captureRequired)) \
+    F(ReturnedValue, loadQmlIdObject, (ExecutionEngine *engine, const Value &context, uint index)) \
+    \
+    F(void, storeQmlScopeObjectProperty, (ExecutionEngine *engine, const Value &context, int propertyIndex, const Value &value)) \
+    F(void, storeQmlContextObjectProperty, (ExecutionEngine *engine, const Value &context, int propertyIndex, const Value &value)) \
 
 struct Q_QML_PRIVATE_EXPORT Runtime {
     Runtime();
diff --git a/src/qml/jsruntime/qv4runtimecodegen.cpp b/src/qml/jsruntime/qv4runtimecodegen.cpp
new file mode 100644
index 0000000000..9c115099b5
--- /dev/null
+++ b/src/qml/jsruntime/qv4runtimecodegen.cpp
@@ -0,0 +1,79 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qv4runtimecodegen_p.h"
+#include "qv4compilerscanfunctions_p.h"
+
+using namespace QV4;
+
+void RuntimeCodegen::generateFromFunctionExpression(const QString &fileName,
+                                                    const QString &sourceCode,
+                                                    AST::FunctionExpression *ast,
+                                                    Compiler::Module *module)
+{
+    _module = module;
+    _module->fileName = fileName;
+    _context = 0;
+
+    Compiler::ScanFunctions scan(this, sourceCode, Compiler::GlobalCode);
+    // fake a global environment
+    scan.enterEnvironment(0, Compiler::FunctionCode);
+    scan(ast);
+    scan.leaveEnvironment();
+
+    int index = defineFunction(ast->name.toString(), ast, ast->formals, ast->body ? ast->body->elements : 0);
+    _module->rootContext = _module->functions.at(index);
+}
+
+void RuntimeCodegen::throwSyntaxError(const AST::SourceLocation &loc, const QString &detail)
+{
+    if (hasError)
+        return;
+    hasError = true;
+    engine->throwSyntaxError(detail, _module->fileName, loc.startLine, loc.startColumn);
+}
+
+void RuntimeCodegen::throwReferenceError(const AST::SourceLocation &loc, const QString &detail)
+{
+    if (hasError)
+        return;
+    hasError = true;
+    engine->throwReferenceError(detail, _module->fileName, loc.startLine, loc.startColumn);
+}
+
diff --git a/src/qml/jit/qv4unop_p.h b/src/qml/jsruntime/qv4runtimecodegen_p.h
index fb68f80eec..be66dc57ca 100644
--- a/src/qml/jit/qv4unop_p.h
+++ b/src/qml/jsruntime/qv4runtimecodegen_p.h
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtQml module of the Qt Toolkit.
@@ -36,8 +36,8 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
-#ifndef QV4UNOP_P_H
-#define QV4UNOP_P_H
+#ifndef QV4RUNTIMECODEGEN_P_H
+#define QV4RUNTIMECODEGEN_P_H
 
 //
 //  W A R N I N G
@@ -50,43 +50,33 @@
 // We mean it.
 //
 
-#include <qv4jsir_p.h>
-#include <qv4isel_masm_p.h>
+#include <private/qv4codegen_p.h>
 
 QT_BEGIN_NAMESPACE
 
-#if ENABLE(ASSEMBLER)
-
 namespace QV4 {
-namespace JIT {
 
-template <typename JITAssembler>
-struct Unop {
-    Unop(JITAssembler *assembler, IR::AluOp operation)
-        : _as(assembler)
-        , op(operation)
+class RuntimeCodegen : public Compiler::Codegen
+{
+public:
+    RuntimeCodegen(ExecutionEngine *engine, Compiler::JSUnitGenerator *jsUnitGenerator, bool strict)
+        : Codegen(jsUnitGenerator, strict)
+        , engine(engine)
     {}
 
-    using RelationalCondition = typename JITAssembler::RelationalCondition;
-    using PointerToValue = typename JITAssembler::PointerToValue;
-    using RuntimeCall = typename JITAssembler::RuntimeCall;
-    using TrustedImm32 = typename JITAssembler::TrustedImm32;
-
-    void generate(IR::Expr *source, IR::Expr *target);
-
-    void generateUMinus(IR::Expr *source, IR::Expr *target);
-    void generateNot(IR::Expr *source, IR::Expr *target);
-    void generateCompl(IR::Expr *source, IR::Expr *target);
+    void generateFromFunctionExpression(const QString &fileName,
+                                        const QString &sourceCode,
+                                        AST::FunctionExpression *ast,
+                                        Compiler::Module *module);
 
-    JITAssembler *_as;
-    IR::AluOp op;
+    void throwSyntaxError(const AST::SourceLocation &loc, const QString &detail) override;
+    void throwReferenceError(const AST::SourceLocation &loc, const QString &detail) override;
+private:
+    ExecutionEngine *engine;
 };
 
 }
-}
-
-#endif
 
 QT_END_NAMESPACE
 
-#endif
+#endif // QV4CODEGEN_P_H
diff --git a/src/qml/jsruntime/qv4scopedvalue_p.h b/src/qml/jsruntime/qv4scopedvalue_p.h
index 04a0c74133..afb5c21d36 100644
--- a/src/qml/jsruntime/qv4scopedvalue_p.h
+++ b/src/qml/jsruntime/qv4scopedvalue_p.h
@@ -52,7 +52,6 @@
 
 #include "qv4engine_p.h"
 #include "qv4value_p.h"
-#include "qv4persistent_p.h"
 #include "qv4property_p.h"
 
 #ifdef V4_USE_VALGRIND
@@ -71,56 +70,45 @@ struct ScopedValue;
 #define CHECK_EXCEPTION() \
     do { \
         if (scope.hasException()) { \
-            scope.result = QV4::Encode::undefined(); \
-            return; \
+            return QV4::Encode::undefined(); \
         } \
     } while (false)
 
 #define RETURN_UNDEFINED() \
-    do { \
-        scope.result = QV4::Encode::undefined(); \
-        return; \
-    } while (false)
+    return QV4::Encode::undefined()
 
 #define RETURN_RESULT(r) \
-    do { \
-        scope.result = r; \
-        return; \
-    } while (false)
+    return QV4::Encode(r)
 
 #define THROW_TYPE_ERROR() \
-    do { \
-        scope.result = scope.engine->throwTypeError(); \
-        return; \
-    } while (false)
+    return scope.engine->throwTypeError()
 
 #define THROW_GENERIC_ERROR(str) \
-    do { \
-        scope.result = scope.engine->throwError(QString::fromUtf8(str)); \
-        return; \
-    } while (false)
+    return scope.engine->throwError(QString::fromUtf8(str))
 
 struct Scope {
-    inline Scope(ExecutionContext *ctx)
+    explicit Scope(ExecutionContext *ctx)
         : engine(ctx->engine())
         , mark(engine->jsStackTop)
-        , result(*engine->jsAlloca(1))
     {
-        result = Encode::undefined();
     }
 
     explicit Scope(ExecutionEngine *e)
         : engine(e)
         , mark(engine->jsStackTop)
-        , result(*engine->jsAlloca(1))
     {
-        result = Encode::undefined();
+    }
+
+    explicit Scope(const Managed *m)
+        : engine(m->engine())
+        , mark(engine->jsStackTop)
+    {
     }
 
     ~Scope() {
 #ifndef QT_NO_DEBUG
         Q_ASSERT(engine->jsStackTop >= mark);
-        Q_ASSERT(engine->currentContext < mark);
+//        Q_ASSERT(engine->currentContext < mark);
         memset(mark, 0, (engine->jsStackTop - mark)*sizeof(Value));
 #endif
 #ifdef V4_USE_VALGRIND
@@ -139,7 +127,6 @@ struct Scope {
 
     ExecutionEngine *engine;
     Value *mark;
-    Value &result;
 
 private:
     Q_DISABLE_COPY(Scope)
@@ -363,27 +350,6 @@ struct Scoped
     Value *ptr;
 };
 
-struct ScopedCallData {
-    ScopedCallData(const Scope &scope, int argc = 0)
-    {
-        int size = int(offsetof(QV4::CallData, args)/sizeof(QV4::Value)) + qMax(argc , int(QV4::Global::ReservedArgumentCount));
-        ptr = reinterpret_cast<CallData *>(scope.alloc(size));
-        ptr->tag = quint32(QV4::Value::ValueTypeInternal::Integer);
-        ptr->argc = argc;
-    }
-
-    CallData *operator->() {
-        return ptr;
-    }
-
-    operator CallData *() const {
-        return ptr;
-    }
-
-    CallData *ptr;
-};
-
-
 inline Value &Value::operator =(const ScopedValue &v)
 {
     _val = v.ptr->rawValue();
@@ -411,25 +377,6 @@ struct ScopedProperty
     Property *property;
 };
 
-struct ExecutionContextSaver
-{
-    Scope scope; // this makes sure that a reference to context on the JS stack goes out of scope as soon as the context is not used anymore.
-    ExecutionContext *savedContext;
-
-    ExecutionContextSaver(const Scope &scope)
-        : scope(scope.engine)
-    {
-        savedContext = scope.engine->currentContext;
-    }
-    ~ExecutionContextSaver()
-    {
-        Q_ASSERT(scope.engine->jsStackTop > scope.engine->currentContext);
-        scope.engine->currentContext = savedContext;
-        scope.engine->current = savedContext->d();
-    }
-};
-
-
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/jsruntime/qv4script.cpp b/src/qml/jsruntime/qv4script.cpp
index 62145f36cc..901f2574da 100644
--- a/src/qml/jsruntime/qv4script.cpp
+++ b/src/qml/jsruntime/qv4script.cpp
@@ -45,6 +45,7 @@
 #include "qv4debugging_p.h"
 #include "qv4profiling_p.h"
 #include "qv4scopedvalue_p.h"
+#include "qv4jscall_p.h"
 
 #include <private/qqmljsengine_p.h>
 #include <private/qqmljslexer_p.h>
@@ -52,8 +53,7 @@
 #include <private/qqmljsast_p.h>
 #include <private/qqmlengine_p.h>
 #include <private/qv4profiling_p.h>
-#include <qv4jsir_p.h>
-#include <qv4codegen_p.h>
+#include <qv4runtimecodegen_p.h>
 
 #include <QtCore/QDebug>
 #include <QtCore/QString>
@@ -61,7 +61,7 @@
 using namespace QV4;
 
 Script::Script(ExecutionEngine *v4, QmlContext *qml, CompiledData::CompilationUnit *compilationUnit)
-    : line(0), column(0), scope(v4->rootContext()), strictMode(false), inheritContext(true), parsed(false)
+    : line(1), column(0), context(v4->rootContext()), strictMode(false), inheritContext(true), parsed(false)
     , compilationUnit(compilationUnit), vmFunction(0), parseAsBinding(true)
 {
     if (qml)
@@ -81,16 +81,16 @@ void Script::parse()
     if (parsed)
         return;
 
-    using namespace QQmlJS;
+    using namespace QV4::Compiler;
 
     parsed = true;
 
-    ExecutionEngine *v4 = scope->engine();
+    ExecutionEngine *v4 = context->engine();
     Scope valueScope(v4);
 
-    IR::Module module(v4->debugger() != 0);
+    Module module(v4->debugger() != 0);
 
-    QQmlJS::Engine ee, *engine = &ee;
+    Engine ee, *engine = &ee;
     Lexer lexer(engine);
     lexer.setCode(sourceCode, line, parseAsBinding);
     Parser parser(engine);
@@ -98,7 +98,7 @@ void Script::parse()
     const bool parsed = parser.parseProgram();
 
     const auto diagnosticMessages = parser.diagnosticMessages();
-    for (const QQmlJS::DiagnosticMessage &m : diagnosticMessages) {
+    for (const DiagnosticMessage &m : diagnosticMessages) {
         if (m.isError()) {
             valueScope.engine->throwSyntaxError(m.message, sourceFile, m.loc.startLine, m.loc.startColumn);
             return;
@@ -117,25 +117,15 @@ void Script::parse()
             return;
         }
 
-        QStringList inheritedLocals;
-        if (inheritContext) {
-            Scoped<CallContext> ctx(valueScope, scope);
-            if (ctx) {
-                for (Identifier * const *i = ctx->variables(), * const *ei = i + ctx->variableCount(); i < ei; ++i)
-                    inheritedLocals.append(*i ? (*i)->string : QString());
-            }
-        }
-
-        RuntimeCodegen cg(v4, strictMode);
-        cg.generateFromProgram(sourceFile, sourceCode, program, &module, QQmlJS::Codegen::EvalCode, inheritedLocals);
+        QV4::Compiler::JSUnitGenerator jsGenerator(&module);
+        RuntimeCodegen cg(v4, &jsGenerator, strictMode);
+        if (inheritContext)
+            cg.setUseFastLookups(false);
+        cg.generateFromProgram(sourceFile, sourceCode, program, &module, compilationMode);
         if (v4->hasException)
             return;
 
-        QV4::Compiler::JSUnitGenerator jsGenerator(&module);
-        QScopedPointer<EvalInstructionSelection> isel(v4->iselFactory->create(QQmlEnginePrivate::get(v4), v4->executableAllocator, &module, &jsGenerator));
-        if (inheritContext)
-            isel->setUseFastLookups(false);
-        compilationUnit = isel->compile();
+        compilationUnit = cg.generateCompilationUnit();
         vmFunction = compilationUnit->linkToEngine(v4);
     }
 
@@ -153,29 +143,16 @@ ReturnedValue Script::run()
     if (!vmFunction)
         return Encode::undefined();
 
-    QV4::ExecutionEngine *engine = scope->engine();
+    QV4::ExecutionEngine *engine = context->engine();
     QV4::Scope valueScope(engine);
 
     if (qmlContext.isUndefined()) {
         TemporaryAssignment<Function*> savedGlobalCode(engine->globalCode, vmFunction);
 
-        ExecutionContextSaver ctxSaver(valueScope);
-        ContextStateSaver stateSaver(valueScope, scope);
-        scope->d()->strictMode = vmFunction->isStrict();
-        scope->d()->lookups = vmFunction->compilationUnit->runtimeLookups;
-        scope->d()->constantTable = vmFunction->compilationUnit->constants;
-        scope->d()->compilationUnit = vmFunction->compilationUnit;
-
-        return Q_V4_PROFILE(engine, vmFunction);
+        return vmFunction->call(engine->globalObject, 0, 0, context);
     } else {
         Scoped<QmlContext> qml(valueScope, qmlContext.value());
-        ScopedCallData callData(valueScope);
-        callData->thisObject = Primitive::undefinedValue();
-        if (vmFunction->canUseSimpleFunction())
-            qml->simpleCall(valueScope, callData, vmFunction);
-        else
-            qml->call(valueScope, callData, vmFunction);
-        return valueScope.result.asReturnedValue();
+        return vmFunction->call(0, 0, 0, qml);
     }
 }
 
@@ -186,24 +163,26 @@ Function *Script::function()
     return vmFunction;
 }
 
-QQmlRefPointer<QV4::CompiledData::CompilationUnit> Script::precompile(IR::Module *module, Compiler::JSUnitGenerator *unitGenerator, ExecutionEngine *engine, const QUrl &url, const QString &source, QList<QQmlError> *reportedErrors, QQmlJS::Directives *directivesCollector)
+QQmlRefPointer<QV4::CompiledData::CompilationUnit> Script::precompile(QV4::Compiler::Module *module, Compiler::JSUnitGenerator *unitGenerator,
+                                                                      const QUrl &url, const QString &source, QList<QQmlError> *reportedErrors,
+                                                                      Directives *directivesCollector)
 {
-    using namespace QQmlJS;
+    using namespace QV4::Compiler;
     using namespace QQmlJS::AST;
 
-    QQmlJS::Engine ee;
+    Engine ee;
     if (directivesCollector)
         ee.setDirectives(directivesCollector);
-    QQmlJS::Lexer lexer(&ee);
+    Lexer lexer(&ee);
     lexer.setCode(source, /*line*/1, /*qml mode*/false);
-    QQmlJS::Parser parser(&ee);
+    Parser parser(&ee);
 
     parser.parseProgram();
 
     QList<QQmlError> errors;
 
     const auto diagnosticMessages = parser.diagnosticMessages();
-    for (const QQmlJS::DiagnosticMessage &m : diagnosticMessages) {
+    for (const DiagnosticMessage &m : diagnosticMessages) {
         if (m.isWarning()) {
             qWarning("%s:%d : %s", qPrintable(url.toString()), m.loc.startLine, qPrintable(m.message));
             continue;
@@ -230,8 +209,9 @@ QQmlRefPointer<QV4::CompiledData::CompilationUnit> Script::precompile(IR::Module
         return 0;
     }
 
-    QQmlJS::Codegen cg(/*strict mode*/false);
-    cg.generateFromProgram(url.toString(), source, program, module, QQmlJS::Codegen::EvalCode);
+    Codegen cg(unitGenerator, /*strict mode*/false);
+    cg.setUseFastLookups(false);
+    cg.generateFromProgram(url.toString(), source, program, module, GlobalCode);
     errors = cg.qmlErrors();
     if (!errors.isEmpty()) {
         if (reportedErrors)
@@ -239,9 +219,7 @@ QQmlRefPointer<QV4::CompiledData::CompilationUnit> Script::precompile(IR::Module
         return 0;
     }
 
-    QScopedPointer<EvalInstructionSelection> isel(engine->iselFactory->create(QQmlEnginePrivate::get(engine), engine->executableAllocator, module, unitGenerator));
-    isel->setUseFastLookups(false);
-    return isel->compile(/*generate unit data*/false);
+    return cg.generateCompilationUnit(/*generate unit data*/false);
 }
 
 QV4::ReturnedValue Script::evaluate(ExecutionEngine *engine, const QString &script, QmlContext *qmlContext)
diff --git a/src/qml/jsruntime/qv4script_p.h b/src/qml/jsruntime/qv4script_p.h
index 4ebe2dd609..158d21c69d 100644
--- a/src/qml/jsruntime/qv4script_p.h
+++ b/src/qml/jsruntime/qv4script_p.h
@@ -54,6 +54,7 @@
 #include "qv4engine_p.h"
 #include "qv4functionobject_p.h"
 #include "qv4qmlcontext_p.h"
+#include "private/qv4compilercontext_p.h"
 
 #include <QQmlError>
 
@@ -61,60 +62,16 @@ QT_BEGIN_NAMESPACE
 
 class QQmlContextData;
 
-namespace QQmlJS {
-class Directives;
-}
-
 namespace QV4 {
 
-struct ContextStateSaver {
-    Value *savedContext;
-    bool strictMode;
-    Lookup *lookups;
-    const QV4::Value *constantTable;
-    CompiledData::CompilationUnitBase *compilationUnit;
-    int lineNumber;
-
-    ContextStateSaver(const Scope &scope, ExecutionContext *context)
-        : savedContext(scope.alloc(1))
-        , strictMode(context->d()->strictMode)
-        , lookups(context->d()->lookups)
-        , constantTable(context->d()->constantTable)
-        , compilationUnit(context->d()->compilationUnit)
-        , lineNumber(context->d()->lineNumber)
-    {
-        savedContext->setM(context->d());
-    }
-    ContextStateSaver(const Scope &scope, Heap::ExecutionContext *context)
-        : savedContext(scope.alloc(1))
-        , strictMode(context->strictMode)
-        , lookups(context->lookups)
-        , constantTable(context->constantTable)
-        , compilationUnit(context->compilationUnit)
-        , lineNumber(context->lineNumber)
-    {
-        savedContext->setM(context);
-    }
-
-    ~ContextStateSaver()
-    {
-        Heap::ExecutionContext *ctx = static_cast<Heap::ExecutionContext *>(savedContext->m());
-        ctx->strictMode = strictMode;
-        ctx->lookups = lookups;
-        ctx->constantTable = constantTable;
-        ctx->compilationUnit = compilationUnit;
-        ctx->lineNumber = lineNumber;
-    }
-};
-
 struct Q_QML_EXPORT Script {
-    Script(ExecutionContext *scope, const QString &sourceCode, const QString &source = QString(), int line = 1, int column = 0)
+    Script(ExecutionContext *scope, QV4::Compiler::CompilationMode mode, const QString &sourceCode, const QString &source = QString(), int line = 1, int column = 0)
         : sourceFile(source), line(line), column(column), sourceCode(sourceCode)
-        , scope(scope), strictMode(false), inheritContext(false), parsed(false)
+        , context(scope), strictMode(false), inheritContext(false), parsed(false), compilationMode(mode)
         , vmFunction(0), parseAsBinding(false) {}
     Script(ExecutionEngine *engine, QmlContext *qml, const QString &sourceCode, const QString &source = QString(), int line = 1, int column = 0)
         : sourceFile(source), line(line), column(column), sourceCode(sourceCode)
-        , scope(engine->rootContext()), strictMode(false), inheritContext(true), parsed(false)
+        , context(engine->rootContext()), strictMode(false), inheritContext(true), parsed(false)
         , vmFunction(0), parseAsBinding(true) {
         if (qml)
             qmlContext.set(engine, *qml);
@@ -125,10 +82,11 @@ struct Q_QML_EXPORT Script {
     int line;
     int column;
     QString sourceCode;
-    ExecutionContext *scope;
+    ExecutionContext *context;
     bool strictMode;
     bool inheritContext;
     bool parsed;
+    QV4::Compiler::CompilationMode compilationMode = QV4::Compiler::EvalCode;
     QV4::PersistentValue qmlContext;
     QQmlRefPointer<CompiledData::CompilationUnit> compilationUnit;
     Function *vmFunction;
@@ -139,7 +97,7 @@ struct Q_QML_EXPORT Script {
 
     Function *function();
 
-    static QQmlRefPointer<CompiledData::CompilationUnit> precompile(IR::Module *module, Compiler::JSUnitGenerator *unitGenerator, ExecutionEngine *engine, const QUrl &url, const QString &source,
+    static QQmlRefPointer<CompiledData::CompilationUnit> precompile(QV4::Compiler::Module *module, Compiler::JSUnitGenerator *unitGenerator, const QUrl &url, const QString &source,
                                                                     QList<QQmlError> *reportedErrors = 0, QQmlJS::Directives *directivesCollector = 0);
 
     static ReturnedValue evaluate(ExecutionEngine *engine, const QString &script, QmlContext *qmlContext);
diff --git a/src/qml/jsruntime/qv4sequenceobject.cpp b/src/qml/jsruntime/qv4sequenceobject.cpp
index 8afc672aa2..78cd7529d8 100644
--- a/src/qml/jsruntime/qv4sequenceobject.cpp
+++ b/src/qml/jsruntime/qv4sequenceobject.cpp
@@ -45,6 +45,7 @@
 #include <private/qv4arrayobject_p.h>
 #include <private/qqmlengine_p.h>
 #include <private/qv4scopedvalue_p.h>
+#include <private/qv4jscall_p.h>
 #include "qv4runtime_p.h"
 #include "qv4objectiterator_p.h"
 #include <private/qqmlvaluetypewrapper_p.h>
@@ -66,10 +67,10 @@ static void generateWarning(QV4::ExecutionEngine *v4, const QString& description
     QQmlError retn;
     retn.setDescription(description);
 
-    QV4::StackFrame frame = v4->currentStackFrame();
+    QV4::CppStackFrame *stackFrame = v4->currentStackFrame;
 
-    retn.setLine(frame.line);
-    retn.setUrl(QUrl(frame.source));
+    retn.setLine(stackFrame->lineNumber());
+    retn.setUrl(QUrl(stackFrame->source()));
     QQmlEnginePrivate::warning(engine, retn);
 }
 
@@ -416,13 +417,15 @@ public:
         bool operator()(typename Container::value_type lhs, typename Container::value_type rhs)
         {
             QV4::Scope scope(m_v4);
-            ScopedObject compare(scope, m_compareFn);
-            ScopedCallData callData(scope, 2);
-            callData->args[0] = convertElementToValue(m_v4, lhs);
-            callData->args[1] = convertElementToValue(m_v4, rhs);
-            callData->thisObject = m_v4->globalObject;
-            compare->call(scope, callData);
-            return scope.result.toNumber() < 0;
+            ScopedFunctionObject compare(scope, m_compareFn);
+            if (!compare)
+                return m_v4->throwTypeError();
+            JSCallData jsCallData(scope, 2);
+            jsCallData->args[0] = convertElementToValue(m_v4, lhs);
+            jsCallData->args[1] = convertElementToValue(m_v4, rhs);
+            *jsCallData->thisObject = m_v4->globalObject;
+            QV4::ScopedValue result(scope, compare->call(jsCallData));
+            return result->toNumber() < 0;
         }
 
     private:
@@ -438,7 +441,7 @@ public:
             loadReference();
         }
 
-        if (callData->argc == 1 && callData->args[0].as<FunctionObject>()) {
+        if (callData->argc() == 1 && callData->args[0].as<FunctionObject>()) {
             CompareFunctor cf(scope.engine, callData->args[0]);
             std::sort(d()->container->begin(), d()->container->end(), cf);
         } else {
@@ -450,8 +453,9 @@ public:
             storeReference();
     }
 
-    static void method_get_length(const BuiltinFunction *, Scope &scope, CallData *callData)
+    static QV4::ReturnedValue method_get_length(const BuiltinFunction *b, CallData *callData)
     {
+        QV4::Scope scope(b);
         QV4::Scoped<QQmlSequence<Container> > This(scope, callData->thisObject.as<QQmlSequence<Container> >());
         if (!This)
             THROW_TYPE_ERROR();
@@ -464,8 +468,9 @@ public:
         RETURN_RESULT(Encode(qint32(This->d()->container->size())));
     }
 
-    static void method_set_length(const BuiltinFunction *, Scope &scope, CallData *callData)
+    static QV4::ReturnedValue method_set_length(const BuiltinFunction *b, CallData *callData)
     {
+        QV4::Scope scope(b);
         QV4::Scoped<QQmlSequence<Container> > This(scope, callData->thisObject.as<QQmlSequence<Container> >());
         if (!This)
             THROW_TYPE_ERROR();
@@ -647,14 +652,20 @@ void SequencePrototype::init()
 }
 #undef REGISTER_QML_SEQUENCE_METATYPE
 
-void SequencePrototype::method_sort(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue SequencePrototype::method_valueOf(const BuiltinFunction *f, CallData *callData)
 {
+    return Encode(callData->thisObject.toString(f->engine()));
+}
+
+ReturnedValue SequencePrototype::method_sort(const BuiltinFunction *b, CallData *callData)
+{
+    Scope scope(b);
     QV4::ScopedObject o(scope, callData->thisObject);
     if (!o || !o->isListType())
         THROW_TYPE_ERROR();
 
-    if (callData->argc >= 2)
-        RETURN_RESULT(o);
+    if (callData->argc() >= 2)
+        return o.asReturnedValue();
 
 #define CALL_SORT(SequenceElementType, SequenceElementTypeName, SequenceType, DefaultValue) \
         if (QQml##SequenceElementTypeName##List *s = o->as<QQml##SequenceElementTypeName##List>()) { \
@@ -665,7 +676,7 @@ void SequencePrototype::method_sort(const BuiltinFunction *b, Scope &scope, Call
 
 #undef CALL_SORT
         {}
-    RETURN_RESULT(o);
+    return o.asReturnedValue();
 }
 
 #define IS_SEQUENCE(unused1, unused2, SequenceType, unused3) \
diff --git a/src/qml/jsruntime/qv4sequenceobject_p.h b/src/qml/jsruntime/qv4sequenceobject_p.h
index 2b8d1ea716..169a48c2f9 100644
--- a/src/qml/jsruntime/qv4sequenceobject_p.h
+++ b/src/qml/jsruntime/qv4sequenceobject_p.h
@@ -68,12 +68,8 @@ struct SequencePrototype : public QV4::Object
     V4_PROTOTYPE(arrayPrototype)
     void init();
 
-    static void method_valueOf(const BuiltinFunction *, Scope &scope, CallData *callData)
-    {
-        scope.result = callData->thisObject.toString(scope.engine);
-    }
-
-    static void method_sort(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_valueOf(const BuiltinFunction *f, CallData *callData);
+    static ReturnedValue method_sort(const BuiltinFunction *, CallData *callData);
 
     static bool isSequenceType(int sequenceTypeId);
     static ReturnedValue newSequence(QV4::ExecutionEngine *engine, int sequenceTypeId, QObject *object, int propertyIndex, bool *succeeded);
diff --git a/src/qml/jsruntime/qv4string.cpp b/src/qml/jsruntime/qv4string.cpp
index c0183a46a7..b38b01c9f7 100644
--- a/src/qml/jsruntime/qv4string.cpp
+++ b/src/qml/jsruntime/qv4string.cpp
@@ -52,17 +52,18 @@ using namespace QV4;
 
 #ifndef V4_BOOTSTRAP
 
-DEFINE_MANAGED_VTABLE(String);
-
-void String::markObjects(Heap::Base *that, MarkStack *markStack)
+void Heap::String::markObjects(Heap::Base *that, MarkStack *markStack)
 {
-    String::Data *s = static_cast<String::Data *>(that);
+    String *s = static_cast<String *>(that);
     if (s->largestSubLength) {
         s->left->mark(markStack);
         s->right->mark(markStack);
     }
 }
 
+DEFINE_MANAGED_VTABLE(String);
+
+
 bool String::isEqualTo(Managed *t, Managed *o)
 {
     if (t == o)
diff --git a/src/qml/jsruntime/qv4string_p.h b/src/qml/jsruntime/qv4string_p.h
index 2f34dd6139..85345aca4d 100644
--- a/src/qml/jsruntime/qv4string_p.h
+++ b/src/qml/jsruntime/qv4string_p.h
@@ -65,6 +65,7 @@ struct Identifier;
 namespace Heap {
 
 struct Q_QML_PRIVATE_EXPORT String : Base {
+    static void markObjects(Heap::Base *that, MarkStack *markStack);
     enum StringType {
         StringType_Unknown,
         StringType_Regular,
@@ -181,7 +182,8 @@ struct Q_QML_PRIVATE_EXPORT String : public Managed {
         makeIdentifierImpl();
     }
 
-    void makeIdentifierImpl() const;
+    // slow path
+    Q_NEVER_INLINE void makeIdentifierImpl() const;
 
     static uint createHashValue(const QChar *ch, int length, uint *subtype)
     {
@@ -205,7 +207,6 @@ struct Q_QML_PRIVATE_EXPORT String : public Managed {
     Identifier *identifier() const { return d()->identifier; }
 
 protected:
-    static void markObjects(Heap::Base *that, MarkStack *markStack);
     static bool isEqualTo(Managed *that, Managed *o);
     static uint getLength(const Managed *m);
 #endif
diff --git a/src/qml/jsruntime/qv4stringobject.cpp b/src/qml/jsruntime/qv4stringobject.cpp
index 7c65c97d73..efab51ec53 100644
--- a/src/qml/jsruntime/qv4stringobject.cpp
+++ b/src/qml/jsruntime/qv4stringobject.cpp
@@ -45,17 +45,11 @@
 #include <private/qv4mm_p.h>
 #include "qv4scopedvalue_p.h"
 #include "qv4alloca_p.h"
+#include "qv4jscall_p.h"
 #include <QtCore/QDateTime>
 #include <QtCore/QDebug>
 #include <QtCore/QStringList>
 
-#include <private/qqmljsengine_p.h>
-#include <private/qqmljslexer_p.h>
-#include <private/qqmljsparser_p.h>
-#include <private/qqmljsast_p.h>
-#include <qv4jsir_p.h>
-#include <qv4codegen_p.h>
-
 #include <cassert>
 
 #ifndef Q_OS_WIN
@@ -108,11 +102,8 @@ bool StringObject::deleteIndexedProperty(Managed *m, uint index)
     Scoped<StringObject> o(scope, m->as<StringObject>());
     Q_ASSERT(!!o);
 
-    if (index < static_cast<uint>(o->d()->string->toQString().length())) {
-        if (v4->current->strictMode)
-            v4->throwTypeError();
+    if (index < static_cast<uint>(o->d()->string->toQString().length()))
         return false;
-    }
     return true;
 }
 
@@ -152,24 +143,25 @@ void Heap::StringCtor::init(QV4::ExecutionContext *scope)
     Heap::FunctionObject::init(scope, QStringLiteral("String"));
 }
 
-void StringCtor::construct(const Managed *m, Scope &scope, CallData *callData)
+ReturnedValue StringCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    ExecutionEngine *v4 = static_cast<const Object *>(m)->engine();
+    ExecutionEngine *v4 = static_cast<const Object *>(f)->engine();
+    Scope scope(v4);
     ScopedString value(scope);
-    if (callData->argc)
-        value = callData->args[0].toString(v4);
+    if (argc)
+        value = argv[0].toString(v4);
     else
         value = v4->newString();
-    scope.result = Encode(v4->newStringObject(value));
+    return Encode(v4->newStringObject(value));
 }
 
-void StringCtor::call(const Managed *, Scope &scope, CallData *callData)
+ReturnedValue StringCtor::call(const FunctionObject *m, const Value *, const Value *argv, int argc)
 {
-    ExecutionEngine *v4 = scope.engine;
-    if (callData->argc)
-        scope.result = callData->args[0].toString(v4);
+    ExecutionEngine *v4 = m->engine();
+    if (argc)
+        return argv[0].toString(v4)->asReturnedValue();
     else
-        scope.result = v4->newString();
+        return v4->newString()->asReturnedValue();
 }
 
 void StringPrototype::init(ExecutionEngine *engine, Object *ctor)
@@ -208,140 +200,154 @@ void StringPrototype::init(ExecutionEngine *engine, Object *ctor)
     defineDefaultProperty(QStringLiteral("trim"), method_trim);
 }
 
-static QString getThisString(Scope &scope, CallData *callData)
+static QString getThisString(ExecutionEngine *v4, const Value *thisObject)
 {
-    ScopedValue t(scope, callData->thisObject);
-    if (String *s = t->stringValue())
+    if (String *s = thisObject->stringValue())
         return s->toQString();
-    if (StringObject *thisString = t->as<StringObject>())
+    if (const StringObject *thisString = thisObject->as<StringObject>())
         return thisString->d()->string->toQString();
-    if (t->isUndefined() || t->isNull()) {
-        scope.engine->throwTypeError();
+    if (thisObject->isUndefined() || thisObject->isNull()) {
+        v4->throwTypeError();
         return QString();
     }
-    return t->toQString();
+    return thisObject->toQString();
 }
 
-void StringPrototype::method_toString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    if (callData->thisObject.isString())
-        RETURN_RESULT(callData->thisObject);
+    if (thisObject->isString())
+        return thisObject->asReturnedValue();
 
-    StringObject *o = callData->thisObject.as<StringObject>();
+    ExecutionEngine *v4 = b->engine();
+    const StringObject *o = thisObject->as<StringObject>();
     if (!o)
-        THROW_TYPE_ERROR();
-    scope.result = o->d()->string;
+        return v4->throwTypeError();
+    return o->d()->string->asReturnedValue();
 }
 
-void StringPrototype::method_charAt(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_charAt(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    const QString str = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString str = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     int pos = 0;
-    if (callData->argc > 0)
-        pos = (int) callData->args[0].toInteger();
+    if (argc > 0)
+        pos = (int) argv[0].toInteger();
 
     QString result;
     if (pos >= 0 && pos < str.length())
         result += str.at(pos);
 
-    scope.result = scope.engine->newString(result);
+    return Encode(v4->newString(result));
 }
 
-void StringPrototype::method_charCodeAt(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_charCodeAt(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    const QString str = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString str = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     int pos = 0;
-    if (callData->argc > 0)
-        pos = (int) callData->args[0].toInteger();
+    if (argc > 0)
+        pos = (int) argv[0].toInteger();
 
 
     if (pos >= 0 && pos < str.length())
         RETURN_RESULT(Encode(str.at(pos).unicode()));
 
-    scope.result = Encode(qt_qnan());
+    return Encode(qt_qnan());
 }
 
-void StringPrototype::method_concat(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_concat(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
+    Scope scope(v4);
     ScopedString s(scope);
-    for (int i = 0; i < callData->argc; ++i) {
-        s = callData->args[i].toString(scope.engine);
-        CHECK_EXCEPTION();
+    for (int i = 0; i < argc; ++i) {
+        s = argv[i].toString(scope.engine);
+        if (v4->hasException)
+            return QV4::Encode::undefined();
 
         Q_ASSERT(s->isString());
         value += s->toQString();
     }
 
-    scope.result = scope.engine->newString(value);
+    return Encode(v4->newString(value));
 }
 
-void StringPrototype::method_endsWith(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_endsWith(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     QString searchString;
-    if (callData->argc) {
-        if (callData->args[0].as<RegExpObject>())
-            THROW_TYPE_ERROR();
-        searchString = callData->args[0].toQString();
+    if (argc) {
+        if (argv[0].as<RegExpObject>())
+            return v4->throwTypeError();
+        searchString = argv[0].toQString();
     }
 
     int pos = value.length();
-    if (callData->argc > 1)
-        pos = (int) callData->args[1].toInteger();
+    if (argc > 1)
+        pos = (int) argv[1].toInteger();
 
     if (pos == value.length())
         RETURN_RESULT(Encode(value.endsWith(searchString)));
 
     QStringRef stringToSearch = value.leftRef(pos);
-    scope.result = Encode(stringToSearch.endsWith(searchString));
+    return Encode(stringToSearch.endsWith(searchString));
 }
 
-void StringPrototype::method_indexOf(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_indexOf(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     QString searchString;
-    if (callData->argc)
-        searchString = callData->args[0].toQString();
+    if (argc)
+        searchString = argv[0].toQString();
 
     int pos = 0;
-    if (callData->argc > 1)
-        pos = (int) callData->args[1].toInteger();
+    if (argc > 1)
+        pos = (int) argv[1].toInteger();
 
     int index = -1;
     if (! value.isEmpty())
         index = value.indexOf(searchString, qMin(qMax(pos, 0), value.length()));
 
-    scope.result = Encode(index);
+    return Encode(index);
 }
 
-void StringPrototype::method_includes(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_includes(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     QString searchString;
-    if (callData->argc) {
-        if (callData->args[0].as<RegExpObject>())
-            THROW_TYPE_ERROR();
-        searchString = callData->args[0].toQString();
+    if (argc) {
+        if (argv[0].as<RegExpObject>())
+            return v4->throwTypeError();
+        searchString = argv[0].toQString();
     }
 
     int pos = 0;
-    if (callData->argc > 1) {
-        ScopedValue posArg(scope, callData->argument(1));
-        pos = (int) posArg->toInteger();
-        if (!posArg->isInteger() && posArg->isNumber() && qIsInf(posArg->toNumber()))
+    if (argc > 1) {
+        const Value &posArg = argv[1];
+        pos = (int) posArg.toInteger();
+        if (!posArg.isInteger() && posArg.isNumber() && qIsInf(posArg.toNumber()))
             pos = value.length();
     }
 
@@ -349,20 +355,21 @@ void StringPrototype::method_includes(const BuiltinFunction *, Scope &scope, Cal
         RETURN_RESULT(Encode(value.contains(searchString)));
 
     QStringRef stringToSearch = value.midRef(pos);
-    scope.result = Encode(stringToSearch.contains(searchString));
+    return Encode(stringToSearch.contains(searchString));
 }
 
-void StringPrototype::method_lastIndexOf(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_lastIndexOf(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    const QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     QString searchString;
-    if (callData->argc)
-        searchString = callData->args[0].toQString();
+    if (argc)
+        searchString = argv[0].toQString();
 
-    ScopedValue posArg(scope, callData->argument(1));
-    double position = RuntimeHelpers::toNumber(posArg);
+    double position = argc > 1 ? RuntimeHelpers::toNumber(argv[1]) : +qInf();
     if (std::isnan(position))
         position = +qInf();
     else
@@ -374,97 +381,84 @@ void StringPrototype::method_lastIndexOf(const BuiltinFunction *, Scope &scope,
     if (searchString.isNull() && pos == 0)
         RETURN_RESULT(Encode(-1));
     int index = value.lastIndexOf(searchString, pos);
-    scope.result = Encode(index);
+    return Encode(index);
 }
 
-void StringPrototype::method_localeCompare(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_localeCompare(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    const QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
-    ScopedValue v(scope, callData->argument(0));
-    const QString that = v->toQString();
-    scope.result = Encode(QString::localeAwareCompare(value, that));
+    const QString that = (argc ? argv[0] : Primitive::undefinedValue()).toQString();
+    return Encode(QString::localeAwareCompare(value, that));
 }
 
-void StringPrototype::method_match(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_match(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    if (callData->thisObject.isUndefined() || callData->thisObject.isNull())
-        THROW_TYPE_ERROR();
+    ExecutionEngine *v4 = b->engine();
+    if (thisObject->isNullOrUndefined())
+        return v4->throwTypeError();
 
-    ScopedString s(scope, callData->thisObject.toString(scope.engine));
-
-    ScopedValue regexp(scope, callData->argument(0));
-    Scoped<RegExpObject> rx(scope, regexp);
-    if (!rx) {
-        ScopedCallData callData(scope, 1);
-        callData->args[0] = regexp;
-        scope.engine->regExpCtor()->construct(scope, callData);
-        rx = scope.result.asReturnedValue();
+    Scope scope(v4);
+    ScopedString s(scope, thisObject->toString(v4));
+    if (v4->hasException)
+        return Encode::undefined();
+
+    Scoped<RegExpObject> that(scope, argc ? argv[0] : Primitive::undefinedValue());
+    if (!that) {
+        // convert args[0] to a regexp
+        that = RegExpCtor::callAsConstructor(b, argv, argc);
+        if (v4->hasException)
+            return Encode::undefined();
     }
+    Q_ASSERT(!!that);
 
-    if (!rx)
-        // ### CHECK
-        THROW_TYPE_ERROR();
-
-    bool global = rx->global();
+    bool global = that->global();
 
-    // ### use the standard builtin function, not the one that might be redefined in the proto
-    ScopedString execString(scope, scope.engine->newString(QStringLiteral("exec")));
-    ScopedFunctionObject exec(scope, scope.engine->regExpPrototype()->get(execString));
+    if (!global)
+        return RegExpPrototype::method_exec(b, that, s, 1);
 
-    ScopedCallData cData(scope, 1);
-    cData->thisObject = rx;
-    cData->args[0] = s;
-    if (!global) {
-        exec->call(scope, cData);
-        return;
-    }
-
-    ScopedString lastIndex(scope, scope.engine->newString(QStringLiteral("lastIndex")));
-    rx->put(lastIndex, ScopedValue(scope, Primitive::fromInt32(0)));
+    // rx is now in thisObject
+    that->setLastIndex(0);
     ScopedArrayObject a(scope, scope.engine->newArrayObject());
 
-    double previousLastIndex = 0;
+    int previousLastIndex = 0;
     uint n = 0;
-    ScopedValue matchStr(scope);
-    ScopedValue index(scope);
     while (1) {
-        exec->call(scope, cData);
-        if (scope.result.isNull())
+        Value result = Primitive::fromReturnedValue(RegExpPrototype::execFirstMatch(b, that, s, 1));
+        if (result.isNull())
             break;
-        assert(scope.result.isObject());
-        index = rx->get(lastIndex, 0);
-        double thisIndex = index->toInteger();
-        if (previousLastIndex == thisIndex) {
-            previousLastIndex = thisIndex + 1;
-            rx->put(lastIndex, ScopedValue(scope, Primitive::fromDouble(previousLastIndex)));
+        int index = that->lastIndex();
+        if (previousLastIndex == index) {
+            previousLastIndex = index + 1;
+            that->setLastIndex(previousLastIndex);
         } else {
-            previousLastIndex = thisIndex;
+            previousLastIndex = index;
         }
-        matchStr = scope.result.objectValue()->getIndexed(0);
-        a->arraySet(n, matchStr);
+        a->arraySet(n, result);
         ++n;
     }
     if (!n)
-        scope.result = Encode::null();
+        return Encode::null();
     else
-        scope.result = a;
+        return a.asReturnedValue();
 }
 
-void StringPrototype::method_repeat(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_repeat(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
-    double repeats = callData->args[0].toInteger();
+    double repeats = (argc ? argv[0] : Primitive::undefinedValue()).toInteger();
 
-    if (repeats < 0 || qIsInf(repeats)) {
-        scope.result = scope.engine->throwRangeError(QLatin1String("Invalid count value"));
-        return;
-    }
+    if (repeats < 0 || qIsInf(repeats))
+        return v4->throwRangeError(QLatin1String("Invalid count value"));
 
-    scope.result = scope.engine->newString(value.repeated(int(repeats)));
+    return Encode(v4->newString(value.repeated(int(repeats))));
 }
 
 static void appendReplacementString(QString *result, const QString &input, const QString& replaceValue, uint* matchOffsets, int captureCount)
@@ -513,13 +507,13 @@ static void appendReplacementString(QString *result, const QString &input, const
     }
 }
 
-void StringPrototype::method_replace(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_replace(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
     QString string;
-    if (StringObject *thisString = callData->thisObject.as<StringObject>())
+    if (const StringObject *thisString = thisObject->as<StringObject>())
         string = thisString->d()->string->toQString();
     else
-        string = callData->thisObject.toQString();
+        string = thisObject->toQString();
 
     int numCaptures = 0;
     int numStringMatches = 0;
@@ -528,7 +522,8 @@ void StringPrototype::method_replace(const BuiltinFunction *, Scope &scope, Call
     uint _matchOffsets[64];
     uint *matchOffsets = _matchOffsets;
 
-    ScopedValue searchValue(scope, callData->argument(0));
+    Scope scope(b);
+    ScopedValue searchValue(scope, argc ? argv[0] : Primitive::undefinedValue());
     Scoped<RegExpObject> regExp(scope, searchValue);
     if (regExp) {
         uint offset = 0;
@@ -571,14 +566,14 @@ void StringPrototype::method_replace(const BuiltinFunction *, Scope &scope, Call
     }
 
     QString result;
-    ScopedValue replaceValue(scope, callData->argument(1));
+    ScopedValue replacement(scope);
+    ScopedValue replaceValue(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
     ScopedFunctionObject searchCallback(scope, replaceValue);
     if (!!searchCallback) {
         result.reserve(string.length() + 10*numStringMatches);
-        ScopedCallData callData(scope, numCaptures + 2);
-        callData->thisObject = Primitive::undefinedValue();
-        int lastEnd = 0;
         ScopedValue entry(scope);
+        Value *arguments = scope.alloc(numCaptures + 2);
+        int lastEnd = 0;
         for (int i = 0; i < numStringMatches; ++i) {
             for (int k = 0; k < numCaptures; ++k) {
                 int idx = (i * numCaptures + k) * 2;
@@ -587,17 +582,18 @@ void StringPrototype::method_replace(const BuiltinFunction *, Scope &scope, Call
                 entry = Primitive::undefinedValue();
                 if (start != JSC::Yarr::offsetNoMatch && end != JSC::Yarr::offsetNoMatch)
                     entry = scope.engine->newString(string.mid(start, end - start));
-                callData->args[k] = entry;
+                arguments[k] = entry;
             }
             uint matchStart = matchOffsets[i * numCaptures * 2];
             Q_ASSERT(matchStart >= static_cast<uint>(lastEnd));
             uint matchEnd = matchOffsets[i * numCaptures * 2 + 1];
-            callData->args[numCaptures] = Primitive::fromUInt32(matchStart);
-            callData->args[numCaptures + 1] = scope.engine->newString(string);
+            arguments[numCaptures] = Primitive::fromUInt32(matchStart);
+            arguments[numCaptures + 1] = scope.engine->newString(string);
 
-            searchCallback->call(scope, callData);
+            Value that = Primitive::undefinedValue();
+            replacement = searchCallback->call(&that, arguments, numCaptures + 2);
             result += string.midRef(lastEnd, matchStart - lastEnd);
-            result += scope.result.toQString();
+            result += replacement->toQString();
             lastEnd = matchEnd;
         }
         result += string.midRef(lastEnd);
@@ -623,44 +619,45 @@ void StringPrototype::method_replace(const BuiltinFunction *, Scope &scope, Call
     if (matchOffsets != _matchOffsets)
         free(matchOffsets);
 
-    scope.result = scope.engine->newString(result);
+    return Encode(scope.engine->newString(result));
 }
 
-void StringPrototype::method_search(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_search(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    QString string = getThisString(scope, callData);
-    scope.result = callData->argument(0);
-    CHECK_EXCEPTION();
+    Scope scope(b);
+    QString string = getThisString(scope.engine, thisObject);
+    if (scope.engine->hasException)
+        return QV4::Encode::undefined();
 
-    Scoped<RegExpObject> regExp(scope, scope.result.as<RegExpObject>());
+    Scoped<RegExpObject> regExp(scope, argc ? argv[0] : Primitive::undefinedValue());
     if (!regExp) {
-        ScopedCallData callData(scope, 1);
-        callData->args[0] = scope.result;
-        scope.engine->regExpCtor()->construct(scope, callData);
-        CHECK_EXCEPTION();
+        regExp = scope.engine->regExpCtor()->callAsConstructor(argv, 1);
+        if (scope.engine->hasException)
+            return QV4::Encode::undefined();
 
-        regExp = scope.result.as<RegExpObject>();
         Q_ASSERT(regExp);
     }
     Scoped<RegExp> re(scope, regExp->value());
     Q_ALLOCA_VAR(uint, matchOffsets, regExp->value()->captureCount() * 2 * sizeof(uint));
     uint result = re->match(string, /*offset*/0, matchOffsets);
     if (result == JSC::Yarr::offsetNoMatch)
-        scope.result = Encode(-1);
+        return Encode(-1);
     else
-        scope.result = Encode(result);
+        return Encode(result);
 }
 
-void StringPrototype::method_slice(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_slice(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    const QString text = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString text = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     const double length = text.length();
 
-    double start = callData->argc ? callData->args[0].toInteger() : 0;
-    double end = (callData->argc < 2 || callData->args[1].isUndefined())
-            ? length : callData->args[1].toInteger();
+    double start = argc ? argv[0].toInteger() : 0;
+    double end = (argc < 2 || argv[1].isUndefined())
+            ? length : argv[1].toInteger();
 
     if (start < 0)
         start = qMax(length + start, 0.);
@@ -676,16 +673,19 @@ void StringPrototype::method_slice(const BuiltinFunction *, Scope &scope, CallDa
     const int intEnd = int(end);
 
     int count = qMax(0, intEnd - intStart);
-    scope.result = scope.engine->newString(text.mid(intStart, count));
+    return Encode(v4->newString(text.mid(intStart, count)));
 }
 
-void StringPrototype::method_split(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_split(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    QString text = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    QString text = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
-    ScopedValue separatorValue(scope, callData->argument(0));
-    ScopedValue limitValue(scope, callData->argument(1));
+    Scope scope(v4);
+    ScopedValue separatorValue(scope, argc ? argv[0] : Primitive::undefinedValue());
+    ScopedValue limitValue(scope, argc > 1 ? argv[1] : Primitive::undefinedValue());
 
     ScopedArrayObject array(scope, scope.engine->newArrayObject());
 
@@ -693,7 +693,7 @@ void StringPrototype::method_split(const BuiltinFunction *, Scope &scope, CallDa
         if (limitValue->isUndefined()) {
             ScopedString s(scope, scope.engine->newString(text));
             array->push_back(s);
-            RETURN_RESULT(array);
+            return array.asReturnedValue();
         }
         RETURN_RESULT(scope.engine->newString(text.left(limitValue->toInteger())));
     }
@@ -701,7 +701,7 @@ void StringPrototype::method_split(const BuiltinFunction *, Scope &scope, CallDa
     uint limit = limitValue->isUndefined() ? UINT_MAX : limitValue->toUInt32();
 
     if (limit == 0)
-        RETURN_RESULT(array);
+        return array.asReturnedValue();
 
     Scoped<RegExpObject> re(scope, separatorValue);
     if (re) {
@@ -742,7 +742,7 @@ void StringPrototype::method_split(const BuiltinFunction *, Scope &scope, CallDa
         if (separator.isEmpty()) {
             for (uint i = 0; i < qMin(limit, uint(text.length())); ++i)
                 array->push_back((s = scope.engine->newString(text.mid(i, 1))));
-            RETURN_RESULT(array);
+            return array.asReturnedValue();
         }
 
         int start = 0;
@@ -756,44 +756,48 @@ void StringPrototype::method_split(const BuiltinFunction *, Scope &scope, CallDa
         if (array->getLength() < limit && start != -1)
             array->push_back((s = scope.engine->newString(text.mid(start))));
     }
-    RETURN_RESULT(array);
+    return array.asReturnedValue();
 }
 
-void StringPrototype::method_startsWith(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_startsWith(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     QString searchString;
-    if (callData->argc) {
-        if (callData->args[0].as<RegExpObject>())
-            THROW_TYPE_ERROR();
-        searchString = callData->args[0].toQString();
+    if (argc) {
+        if (argv[0].as<RegExpObject>())
+            return v4->throwTypeError();
+        searchString = argv[0].toQString();
     }
 
     int pos = 0;
-    if (callData->argc > 1)
-        pos = (int) callData->args[1].toInteger();
+    if (argc > 1)
+        pos = (int) argv[1].toInteger();
 
     if (pos == 0)
-        RETURN_RESULT(Encode(value.startsWith(searchString)));
+        return Encode(value.startsWith(searchString));
 
     QStringRef stringToSearch = value.midRef(pos);
     RETURN_RESULT(Encode(stringToSearch.startsWith(searchString)));
 }
 
-void StringPrototype::method_substr(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_substr(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    const QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     double start = 0;
-    if (callData->argc > 0)
-        start = callData->args[0].toInteger();
+    if (argc > 0)
+        start = argv[0].toInteger();
 
     double length = +qInf();
-    if (callData->argc > 1)
-        length = callData->args[1].toInteger();
+    if (argc > 1)
+        length = argv[1].toInteger();
 
     double count = value.length();
     if (start < 0)
@@ -803,25 +807,26 @@ void StringPrototype::method_substr(const BuiltinFunction *, Scope &scope, CallD
 
     qint32 x = Primitive::toInt32(start);
     qint32 y = Primitive::toInt32(length);
-    scope.result = scope.engine->newString(value.mid(x, y));
+    return Encode(v4->newString(value.mid(x, y)));
 }
 
-void StringPrototype::method_substring(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_substring(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     int length = value.length();
 
     double start = 0;
     double end = length;
 
-    if (callData->argc > 0)
-        start = callData->args[0].toInteger();
+    if (argc > 0)
+        start = argv[0].toInteger();
 
-    ScopedValue endValue(scope, callData->argument(1));
-    if (!endValue->isUndefined())
-        end = endValue->toInteger();
+    if (argc > 1 && !argv[1].isUndefined())
+        end = argv[1].toInteger();
 
     if (std::isnan(start) || start < 0)
         start = 0;
@@ -843,50 +848,56 @@ void StringPrototype::method_substring(const BuiltinFunction *, Scope &scope, Ca
 
     qint32 x = (int)start;
     qint32 y = (int)(end - start);
-    scope.result = scope.engine->newString(value.mid(x, y));
+    return Encode(v4->newString(value.mid(x, y)));
 }
 
-void StringPrototype::method_toLowerCase(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_toLowerCase(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
-    scope.result = scope.engine->newString(value.toLower());
+    return Encode(v4->newString(value.toLower()));
 }
 
-void StringPrototype::method_toLocaleLowerCase(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_toLocaleLowerCase(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    method_toLowerCase(b, scope, callData);
+    return method_toLowerCase(b, thisObject, argv, argc);
 }
 
-void StringPrototype::method_toUpperCase(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_toUpperCase(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    QString value = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    const QString value = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
-    scope.result = scope.engine->newString(value.toUpper());
+    return Encode(v4->newString(value.toUpper()));
 }
 
-void StringPrototype::method_toLocaleUpperCase(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_toLocaleUpperCase(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    return method_toUpperCase(b, scope, callData);
+    return method_toUpperCase(b, thisObject, argv, argc);
 }
 
-void StringPrototype::method_fromCharCode(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_fromCharCode(const FunctionObject *b, const Value *, const Value *argv, int argc)
 {
-    QString str(callData->argc, Qt::Uninitialized);
+    QString str(argc, Qt::Uninitialized);
     QChar *ch = str.data();
-    for (int i = 0; i < callData->argc; ++i) {
-        *ch = QChar(callData->args[i].toUInt16());
+    for (int i = 0, ei = argc; i < ei; ++i) {
+        *ch = QChar(argv[i].toUInt16());
         ++ch;
     }
-    scope.result = scope.engine->newString(str);
+    return Encode(b->engine()->newString(str));
 }
 
-void StringPrototype::method_trim(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue StringPrototype::method_trim(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    QString s = getThisString(scope, callData);
-    CHECK_EXCEPTION();
+    ExecutionEngine *v4 = b->engine();
+    QString s = getThisString(v4, thisObject);
+    if (v4->hasException)
+        return QV4::Encode::undefined();
 
     const QChar *chars = s.constData();
     int start, end;
@@ -899,5 +910,5 @@ void StringPrototype::method_trim(const BuiltinFunction *, Scope &scope, CallDat
             break;
     }
 
-    scope.result = scope.engine->newString(QString(chars + start, end - start + 1));
+    return Encode(v4->newString(QString(chars + start, end - start + 1)));
 }
diff --git a/src/qml/jsruntime/qv4stringobject_p.h b/src/qml/jsruntime/qv4stringobject_p.h
index ce046f4844..7d25678b61 100644
--- a/src/qml/jsruntime/qv4stringobject_p.h
+++ b/src/qml/jsruntime/qv4stringobject_p.h
@@ -64,7 +64,7 @@ namespace Heap {
     Member(class, Pointer, String *, string)
 
 DECLARE_HEAP_OBJECT(StringObject, Object) {
-    DECLARE_MARK_TABLE(StringObject);
+    DECLARE_MARKOBJECTS(StringObject);
 
     enum {
         LengthPropertyIndex = 0
@@ -106,8 +106,8 @@ struct StringCtor: FunctionObject
 {
     V4_OBJECT2(StringCtor, FunctionObject)
 
-    static void construct(const Managed *m, Scope &scope, CallData *callData);
-    static void call(const Managed *, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 struct StringPrototype: StringObject
@@ -115,30 +115,30 @@ struct StringPrototype: StringObject
     V4_PROTOTYPE(objectPrototype)
     void init(ExecutionEngine *engine, Object *ctor);
 
-    static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_charAt(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_charCodeAt(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_concat(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_endsWith(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_indexOf(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_includes(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_lastIndexOf(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_localeCompare(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_match(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_repeat(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_replace(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_search(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_slice(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_split(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_startsWith(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_substr(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_substring(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toLowerCase(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toLocaleLowerCase(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toUpperCase(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toLocaleUpperCase(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_fromCharCode(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_trim(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_charAt(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_charCodeAt(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_concat(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_endsWith(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_indexOf(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_includes(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_lastIndexOf(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_localeCompare(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_match(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_repeat(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_replace(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_search(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_slice(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_split(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_startsWith(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_substr(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_substring(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toLowerCase(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toLocaleLowerCase(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toUpperCase(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_toLocaleUpperCase(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_fromCharCode(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_trim(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 }
diff --git a/src/qml/jsruntime/qv4typedarray.cpp b/src/qml/jsruntime/qv4typedarray.cpp
index fe27d7c2d2..4ba31f9b6e 100644
--- a/src/qml/jsruntime/qv4typedarray.cpp
+++ b/src/qml/jsruntime/qv4typedarray.cpp
@@ -39,6 +39,7 @@
 #include "qv4typedarray_p.h"
 #include "qv4arraybuffer_p.h"
 #include "qv4string_p.h"
+#include "qv4jscall_p.h"
 
 #include <cmath>
 
@@ -208,36 +209,32 @@ void Heap::TypedArrayCtor::init(QV4::ExecutionContext *scope, TypedArray::Type t
     type = t;
 }
 
-void TypedArrayCtor::construct(const Managed *m, Scope &scope, CallData *callData)
+ReturnedValue TypedArrayCtor::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
 {
-    Scoped<TypedArrayCtor> that(scope, static_cast<const TypedArrayCtor *>(m));
+    Scope scope(f->engine());
+    const TypedArrayCtor *that = static_cast<const TypedArrayCtor *>(f);
 
-    if (!callData->argc || !callData->args[0].isObject()) {
+    if (!argc || !argv[0].isObject()) {
         // ECMA 6 22.2.1.1
-        double l = callData->argc ? callData->args[0].toNumber() : 0;
-        if (scope.engine->hasException) {
-            scope.result = Encode::undefined();
-            return;
-        }
+        double l = argc ? argv[0].toNumber() : 0;
+        if (scope.engine->hasException)
+            return Encode::undefined();
         uint len = (uint)l;
         if (l != len)
             scope.engine->throwRangeError(QStringLiteral("Non integer length for typed array."));
         uint byteLength = len * operations[that->d()->type].bytesPerElement;
         Scoped<ArrayBuffer> buffer(scope, scope.engine->newArrayBuffer(byteLength));
-        if (scope.engine->hasException) {
-            scope.result = Encode::undefined();
-            return;
-        }
+        if (scope.engine->hasException)
+            return Encode::undefined();
 
         Scoped<TypedArray> array(scope, TypedArray::create(scope.engine, that->d()->type));
         array->d()->buffer.set(scope.engine, buffer->d());
         array->d()->byteLength = byteLength;
         array->d()->byteOffset = 0;
 
-        scope.result = array.asReturnedValue();
-        return;
+        return array.asReturnedValue();
     }
-    Scoped<TypedArray> typedArray(scope, callData->argument(0));
+    Scoped<TypedArray> typedArray(scope, argc ? argv[0] : Primitive::undefinedValue());
     if (!!typedArray) {
         // ECMA 6 22.2.1.2
         Scoped<ArrayBuffer> buffer(scope, typedArray->d()->buffer);
@@ -247,10 +244,8 @@ void TypedArrayCtor::construct(const Managed *m, Scope &scope, CallData *callDat
         uint destByteLength = byteLength*destElementSize/srcElementSize;
 
         Scoped<ArrayBuffer> newBuffer(scope, scope.engine->newArrayBuffer(destByteLength));
-        if (scope.engine->hasException) {
-            scope.result = Encode::undefined();
-            return;
-        }
+        if (scope.engine->hasException)
+            return Encode::undefined();
 
         Scoped<TypedArray> array(scope, TypedArray::create(scope.engine, that->d()->type));
         array->d()->buffer.set(scope.engine, newBuffer->d());
@@ -275,39 +270,30 @@ void TypedArrayCtor::construct(const Managed *m, Scope &scope, CallData *callDat
             }
         }
 
-        scope.result =  array.asReturnedValue();
-        return;
+        return array.asReturnedValue();
     }
-    Scoped<ArrayBuffer> buffer(scope, callData->argument(0));
+    Scoped<ArrayBuffer> buffer(scope, argc ? argv[0] : Primitive::undefinedValue());
     if (!!buffer) {
         // ECMA 6 22.2.1.4
 
-        double dbyteOffset = callData->argc > 1 ? callData->args[1].toInteger() : 0;
+        double dbyteOffset = argc > 1 ? argv[1].toInteger() : 0;
         uint byteOffset = (uint)dbyteOffset;
         uint elementSize = operations[that->d()->type].bytesPerElement;
-        if (dbyteOffset < 0 || (byteOffset % elementSize) || dbyteOffset > buffer->byteLength()) {
-            scope.result = scope.engine->throwRangeError(QStringLiteral("new TypedArray: invalid byteOffset"));
-            return;
-        }
+        if (dbyteOffset < 0 || (byteOffset % elementSize) || dbyteOffset > buffer->byteLength())
+            return scope.engine->throwRangeError(QStringLiteral("new TypedArray: invalid byteOffset"));
 
         uint byteLength;
-        if (callData->argc < 3 || callData->args[2].isUndefined()) {
+        if (argc < 3 || argv[2].isUndefined()) {
             byteLength = buffer->byteLength() - byteOffset;
-            if (buffer->byteLength() < byteOffset || byteLength % elementSize) {
-                scope.result = scope.engine->throwRangeError(QStringLiteral("new TypedArray: invalid length"));
-                return;
-            }
+            if (buffer->byteLength() < byteOffset || byteLength % elementSize)
+                return scope.engine->throwRangeError(QStringLiteral("new TypedArray: invalid length"));
         } else {
-            double l = qBound(0., callData->args[2].toInteger(), (double)UINT_MAX);
-            if (scope.engine->hasException) {
-                scope.result = Encode::undefined();
-                return;
-            }
+            double l = qBound(0., argv[2].toInteger(), (double)UINT_MAX);
+            if (scope.engine->hasException)
+                return Encode::undefined();
             l *= elementSize;
-            if (buffer->byteLength() - byteOffset < l) {
-                scope.result = scope.engine->throwRangeError(QStringLiteral("new TypedArray: invalid length"));
-                return;
-            }
+            if (buffer->byteLength() - byteOffset < l)
+                return scope.engine->throwRangeError(QStringLiteral("new TypedArray: invalid length"));
             byteLength = (uint)l;
         }
 
@@ -315,25 +301,20 @@ void TypedArrayCtor::construct(const Managed *m, Scope &scope, CallData *callDat
         array->d()->buffer.set(scope.engine, buffer->d());
         array->d()->byteLength = byteLength;
         array->d()->byteOffset = byteOffset;
-        scope.result = array.asReturnedValue();
-        return;
+        return array.asReturnedValue();
     }
 
     // ECMA 6 22.2.1.3
 
-    ScopedObject o(scope, callData->argument(0));
+    ScopedObject o(scope, argc ? argv[0] : Primitive::undefinedValue());
     uint l = (uint) qBound(0., ScopedValue(scope, o->get(scope.engine->id_length()))->toInteger(), (double)UINT_MAX);
-    if (scope.engine->hasException) {
-        scope.result = scope.engine->throwTypeError();
-        return;
-    }
+    if (scope.engine->hasException)
+        return scope.engine->throwTypeError();
 
     uint elementSize = operations[that->d()->type].bytesPerElement;
     Scoped<ArrayBuffer> newBuffer(scope, scope.engine->newArrayBuffer(l * elementSize));
-    if (scope.engine->hasException) {
-        scope.result = Encode::undefined();
-        return;
-    }
+    if (scope.engine->hasException)
+        return Encode::undefined();
 
     Scoped<TypedArray> array(scope, TypedArray::create(scope.engine, that->d()->type));
     array->d()->buffer.set(scope.engine, newBuffer->d());
@@ -346,21 +327,19 @@ void TypedArrayCtor::construct(const Managed *m, Scope &scope, CallData *callDat
     while (idx < l) {
         val = o->getIndexed(idx);
         array->d()->type->write(scope.engine, b, 0, val);
-        if (scope.engine->hasException) {
-            scope.result = Encode::undefined();
-            return;
-        }
+        if (scope.engine->hasException)
+            return Encode::undefined();
         ++idx;
         b += elementSize;
     }
 
 
-    scope.result = array.asReturnedValue();
+    return array.asReturnedValue();
 }
 
-void TypedArrayCtor::call(const Managed *that, Scope &scope, CallData *callData)
+ReturnedValue TypedArrayCtor::call(const FunctionObject *f, const Value *, const Value *argv, int argc)
 {
-    construct(that, scope, callData);
+    return callAsConstructor(f, argv, argc);
 }
 
 void Heap::TypedArray::init(Type t)
@@ -406,15 +385,10 @@ bool TypedArray::putIndexed(Managed *m, uint index, const Value &value)
     uint bytesPerElement = a->d()->type->bytesPerElement;
     uint byteOffset = a->d()->byteOffset + index * bytesPerElement;
     if (byteOffset + bytesPerElement > (uint)a->d()->buffer->byteLength())
-        goto reject;
+        return false;
 
     a->d()->type->write(scope.engine, a->d()->buffer->data->data(), byteOffset, value);
     return true;
-
-reject:
-  if (scope.engine->current->strictMode)
-      scope.engine->throwTypeError();
-  return false;
 }
 
 void TypedArrayPrototype::init(ExecutionEngine *engine, TypedArrayCtor *ctor)
@@ -435,52 +409,57 @@ void TypedArrayPrototype::init(ExecutionEngine *engine, TypedArrayCtor *ctor)
     defineDefaultProperty(QStringLiteral("subarray"), method_subarray, 0);
 }
 
-void TypedArrayPrototype::method_get_buffer(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue TypedArrayPrototype::method_get_buffer(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Scoped<TypedArray> v(scope, callData->thisObject);
+    ExecutionEngine *v4 = b->engine();
+    const TypedArray *v = thisObject->as<TypedArray>();
     if (!v)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
-    scope.result = v->d()->buffer;
+    return v->d()->buffer->asReturnedValue();
 }
 
-void TypedArrayPrototype::method_get_byteLength(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue TypedArrayPrototype::method_get_byteLength(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Scoped<TypedArray> v(scope, callData->thisObject);
+    ExecutionEngine *v4 = b->engine();
+    const TypedArray *v = thisObject->as<TypedArray>();
     if (!v)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
-    scope.result = Encode(v->d()->byteLength);
+    return Encode(v->d()->byteLength);
 }
 
-void TypedArrayPrototype::method_get_byteOffset(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue TypedArrayPrototype::method_get_byteOffset(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Scoped<TypedArray> v(scope, callData->thisObject);
+    ExecutionEngine *v4 = b->engine();
+    const TypedArray *v = thisObject->as<TypedArray>();
     if (!v)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
-    scope.result = Encode(v->d()->byteOffset);
+    return Encode(v->d()->byteOffset);
 }
 
-void TypedArrayPrototype::method_get_length(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue TypedArrayPrototype::method_get_length(const FunctionObject *b, const Value *thisObject, const Value *, int)
 {
-    Scoped<TypedArray> v(scope, callData->thisObject);
+    ExecutionEngine *v4 = b->engine();
+    const TypedArray *v = thisObject->as<TypedArray>();
     if (!v)
-        THROW_TYPE_ERROR();
+        return v4->throwTypeError();
 
-    scope.result = Encode(v->d()->byteLength/v->d()->type->bytesPerElement);
+    return Encode(v->d()->byteLength/v->d()->type->bytesPerElement);
 }
 
-void TypedArrayPrototype::method_set(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue TypedArrayPrototype::method_set(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<TypedArray> a(scope, callData->thisObject);
+    Scope scope(b);
+    Scoped<TypedArray> a(scope, *thisObject);
     if (!a)
-        THROW_TYPE_ERROR();
+        return scope.engine->throwTypeError();
     Scoped<ArrayBuffer> buffer(scope, a->d()->buffer);
     if (!buffer)
         scope.engine->throwTypeError();
 
-    double doffset = callData->argc >= 2 ? callData->args[1].toInteger() : 0;
+    double doffset = argc >= 2 ? argv[1].toInteger() : 0;
     if (scope.engine->hasException)
         RETURN_UNDEFINED();
 
@@ -489,17 +468,17 @@ void TypedArrayPrototype::method_set(const BuiltinFunction *, Scope &scope, Call
     uint offset = (uint)doffset;
     uint elementSize = a->d()->type->bytesPerElement;
 
-    Scoped<TypedArray> srcTypedArray(scope, callData->args[0]);
+    Scoped<TypedArray> srcTypedArray(scope, argv[0]);
     if (!srcTypedArray) {
         // src is a regular object
-        ScopedObject o(scope, callData->args[0].toObject(scope.engine));
+        ScopedObject o(scope, argv[0].toObject(scope.engine));
         if (scope.engine->hasException || !o)
-            THROW_TYPE_ERROR();
+            return scope.engine->throwTypeError();
 
         double len = ScopedValue(scope, o->get(scope.engine->id_length()))->toNumber();
         uint l = (uint)len;
         if (scope.engine->hasException || l != len)
-            THROW_TYPE_ERROR();
+            return scope.engine->throwTypeError();
 
         if (offset + l > a->length())
             RETURN_RESULT(scope.engine->throwRangeError(QStringLiteral("TypedArray.set: out of range")));
@@ -521,7 +500,7 @@ void TypedArrayPrototype::method_set(const BuiltinFunction *, Scope &scope, Call
     // src is a typed array
     Scoped<ArrayBuffer> srcBuffer(scope, srcTypedArray->d()->buffer);
     if (!srcBuffer)
-        THROW_TYPE_ERROR();
+        return scope.engine->throwTypeError();
 
     uint l = srcTypedArray->length();
     if (offset + l > a->length())
@@ -559,24 +538,25 @@ void TypedArrayPrototype::method_set(const BuiltinFunction *, Scope &scope, Call
     RETURN_UNDEFINED();
 }
 
-void TypedArrayPrototype::method_subarray(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue TypedArrayPrototype::method_subarray(const FunctionObject *builtin, const Value *thisObject, const Value *argv, int argc)
 {
-    Scoped<TypedArray> a(scope, callData->thisObject);
+    Scope scope(builtin);
+    Scoped<TypedArray> a(scope, *thisObject);
 
     if (!a)
-        THROW_TYPE_ERROR();
+        return scope.engine->throwTypeError();
 
     Scoped<ArrayBuffer> buffer(scope, a->d()->buffer);
     if (!buffer)
-        THROW_TYPE_ERROR();
+        return scope.engine->throwTypeError();
 
     int len = a->length();
-    double b = callData->argc > 0 ? callData->args[0].toInteger() : 0;
+    double b = argc > 0 ? argv[0].toInteger() : 0;
     if (b < 0)
         b = len + b;
     uint begin = (uint)qBound(0., b, (double)len);
 
-    double e = callData->argc < 2 || callData->args[1].isUndefined() ? len : callData->args[1].toInteger();
+    double e = argc < 2 || argv[1].isUndefined() ? len : argv[1].toInteger();
     if (e < 0)
         e = len + e;
     uint end = (uint)qBound(0., e, (double)len);
@@ -590,11 +570,11 @@ void TypedArrayPrototype::method_subarray(const BuiltinFunction *, Scope &scope,
 
     ScopedFunctionObject constructor(scope, a->get(scope.engine->id_constructor()));
     if (!constructor)
-        THROW_TYPE_ERROR();
+        return scope.engine->throwTypeError();
 
-    ScopedCallData cData(scope, 3);
-    cData->args[0] = buffer;
-    cData->args[1] = Encode(a->d()->byteOffset + begin*a->d()->type->bytesPerElement);
-    cData->args[2] = Encode(newLen);
-    constructor->construct(scope, cData);
+    Value *arguments = scope.alloc(3);
+    arguments[0] = buffer;
+    arguments[1] = Encode(a->d()->byteOffset + begin*a->d()->type->bytesPerElement);
+    arguments[2] = Encode(newLen);
+    return constructor->callAsConstructor(arguments, 3);
 }
diff --git a/src/qml/jsruntime/qv4typedarray_p.h b/src/qml/jsruntime/qv4typedarray_p.h
index a472dfa607..129c662c97 100644
--- a/src/qml/jsruntime/qv4typedarray_p.h
+++ b/src/qml/jsruntime/qv4typedarray_p.h
@@ -80,7 +80,7 @@ namespace Heap {
     Member(class, NoMark, uint, arrayType)
 
 DECLARE_HEAP_OBJECT(TypedArray, Object) {
-    DECLARE_MARK_TABLE(TypedArray);
+    DECLARE_MARKOBJECTS(TypedArray);
     enum Type {
         Int8Array,
         UInt8Array,
@@ -141,8 +141,8 @@ struct TypedArrayCtor: FunctionObject
 {
     V4_OBJECT2(TypedArrayCtor, FunctionObject)
 
-    static void construct(const Managed *m, Scope &scope, CallData *callData);
-    static void call(const Managed *that, Scope &scope, CallData *callData);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
 };
 
 
@@ -153,13 +153,13 @@ struct TypedArrayPrototype : Object
 
     void init(ExecutionEngine *engine, TypedArrayCtor *ctor);
 
-    static void method_get_buffer(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_byteLength(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_byteOffset(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_length(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_get_buffer(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_get_byteLength(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_get_byteOffset(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_get_length(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 
-    static void method_set(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_subarray(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_set(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_subarray(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
 };
 
 inline void
diff --git a/src/qml/jsruntime/qv4value.cpp b/src/qml/jsruntime/qv4value.cpp
index f41442df7a..0d4711df3c 100644
--- a/src/qml/jsruntime/qv4value.cpp
+++ b/src/qml/jsruntime/qv4value.cpp
@@ -75,39 +75,29 @@ int Value::toUInt16() const
     return (unsigned short)number;
 }
 
-bool Value::toBoolean() const
+bool Value::toBooleanImpl(Value val)
 {
-    if (isInteger() || isBoolean())
-        return static_cast<bool>(int_32());
-
-    if (isUndefined() || isNull())
-        return false;
-
-    if (isManaged()) {
+    if (val.isManagedOrUndefined()) {
+        Heap::Base *b = val.m();
+        if (!b)
+            return false;
 #ifdef V4_BOOTSTRAP
         Q_UNIMPLEMENTED();
 #else
-        if (String *s = stringValue())
-            return s->toQString().length() > 0;
+        if (b->vtable()->isString)
+            return static_cast<Heap::String *>(b)->length() > 0;
 #endif
         return true;
     }
 
     // double
-    return doubleValue() && !std::isnan(doubleValue());
+    double d = val.doubleValue();
+    return d && !std::isnan(d);
 }
 
-double Value::toInteger() const
+double Value::toNumberImpl(Value val)
 {
-    if (integerCompatible())
-        return int_32();
-
-    return Primitive::toInteger(toNumber());
-}
-
-double Value::toNumberImpl() const
-{
-    switch (type()) {
+    switch (val.type()) {
     case QV4::Value::Undefined_Type:
         return std::numeric_limits<double>::quiet_NaN();
     case QV4::Value::Managed_Type:
@@ -115,12 +105,13 @@ double Value::toNumberImpl() const
         Q_UNIMPLEMENTED();
         Q_FALLTHROUGH();
 #else
-        if (String *s = stringValue())
+        if (String *s = val.stringValue())
             return RuntimeHelpers::stringToNumber(s->toQString());
     {
-        Q_ASSERT(isObject());
-        Scope scope(objectValue()->engine());
-        ScopedValue prim(scope, RuntimeHelpers::toPrimitive(*this, NUMBER_HINT));
+        Q_ASSERT(val.isObject());
+        Scope scope(val.objectValue()->engine());
+        ScopedValue protectThis(scope, val);
+        ScopedValue prim(scope, RuntimeHelpers::toPrimitive(val, NUMBER_HINT));
             if (scope.engine->hasException)
                 return 0;
             return prim->toNumber();
@@ -129,7 +120,7 @@ double Value::toNumberImpl() const
     case QV4::Value::Null_Type:
     case QV4::Value::Boolean_Type:
     case QV4::Value::Integer_Type:
-        return int_32();
+        return val.int_32();
     default: // double
         Q_UNREACHABLE();
     }
@@ -236,83 +227,23 @@ bool Value::sameValue(Value other) const {
     if (s && os)
         return s->isEqualTo(os);
     if (isInteger() && other.isDouble())
-        return int_32() ? (double(int_32()) == other.doubleValue()) : (other._val == 0);
+        return int_32() ? (double(int_32()) == other.doubleValue())
+                        : (other.doubleValue() == 0 && !std::signbit(other.doubleValue()));
     if (isDouble() && other.isInteger())
-        return other.int_32() ? (doubleValue() == double(other.int_32())) : (_val == 0);
+        return other.int_32() ? (doubleValue() == double(other.int_32()))
+                              : (doubleValue() == 0 && !std::signbit(doubleValue()));
     return false;
 }
 
-
-int Primitive::toInt32(double number)
-{
-    const double D32 = 4294967296.0;
-    const double D31 = D32 / 2.0;
-
-    if ((number >= -D31 && number < D31))
-        return static_cast<int>(number);
-
-
-    if (!std::isfinite(number))
-        return 0;
-
-    double d = ::floor(::fabs(number));
-    if (std::signbit(number))
-        d = -d;
-
-    number = ::fmod(d , D32);
-
-    if (number < -D31)
-        number += D32;
-    else if (number >= D31)
-        number -= D32;
-
-    return int(number);
-}
-
-unsigned int Primitive::toUInt32(double number)
-{
-    const double D32 = 4294967296.0;
-    if ((number >= 0 && number < D32))
-        return static_cast<uint>(number);
-
-    if (!std::isfinite(number))
-        return +0;
-
-    double d = ::floor(::fabs(number));
-    if (std::signbit(number))
-        d = -d;
-
-    number = ::fmod(d , D32);
-
-    if (number < 0)
-        number += D32;
-
-    return unsigned(number);
-}
-
-double Primitive::toInteger(double number)
-{
-    if (std::isnan(number))
-        return +0;
-    else if (! number || std::isinf(number))
-        return number;
-    const double v = floor(fabs(number));
-    return std::signbit(number) ? -v : v;
-}
-
 #ifndef V4_BOOTSTRAP
-Heap::String *Value::toString(ExecutionEngine *e) const
+Heap::String *Value::toString(ExecutionEngine *e, Value val)
 {
-    if (String *s = stringValue())
-        return s->d();
-    return RuntimeHelpers::convertToString(e, *this);
+    return RuntimeHelpers::convertToString(e, val);
 }
 
-Heap::Object *Value::toObject(ExecutionEngine *e) const
+Heap::Object *Value::toObject(ExecutionEngine *e, Value val)
 {
-    if (Object *o = objectValue())
-        return o->d();
-    return RuntimeHelpers::convertToObject(e, *this);
+    return RuntimeHelpers::convertToObject(e, val);
 }
 
 uint Value::asArrayLength(bool *ok) const
diff --git a/src/qml/jsruntime/qv4value_p.h b/src/qml/jsruntime/qv4value_p.h
index 17d0c32853..52d9f23afd 100644
--- a/src/qml/jsruntime/qv4value_p.h
+++ b/src/qml/jsruntime/qv4value_p.h
@@ -51,15 +51,12 @@
 //
 
 #include <limits.h>
+#include <cmath>
 
 #include <QtCore/QString>
 #include "qv4global_p.h"
 #include <private/qv4heap_p.h>
 
-#if QT_POINTER_SIZE == 8
-#define QV4_USE_64_BIT_VALUE_ENCODING
-#endif
-
 QT_BEGIN_NAMESPACE
 
 namespace QV4 {
@@ -72,9 +69,7 @@ struct Q_QML_PRIVATE_EXPORT Value
 {
 private:
     /*
-        We use two different ways of encoding JS values. One for 32bit and one for 64bit systems.
-
-        In both cases, we use 8 bytes for a value and a different variant of NaN boxing. A Double
+        We use 8 bytes for a value and a different variant of NaN boxing. A Double
         NaN (actually -qNaN) is indicated by a number that has the top 13 bits set, and for a
         signalling NaN it is the top 14 bits. The other values are usually set to 0 by the
         processor, and are thus free for us to store other data. We keep pointers in there for
@@ -83,18 +78,14 @@ private:
         only have 48 bits of addressable memory. (Note: we do leave the lower 49 bits available for
         pointers.)
 
-        On 32bit, we store doubles as doubles. All other values, have the high 32bits set to a value
-        that will make the number a NaN. The Masks below are used for encoding the other types.
-
-        On 64 bit, we xor Doubles with (0xffff8000 << 32). That has the effect that no doubles will
+        We xor Doubles with (0xffff8000 << 32). That has the effect that no doubles will
         get encoded with bits 63-49 all set to 0. We then use bit 48 to distinguish between
         managed/undefined (0), or Null/Int/Bool/Empty (1). So, storing a 49 bit pointer will leave
         the top 15 bits 0, which is exactly the 'natural' representation of pointers. If bit 49 is
         set, bit 48 indicates Empty (0) or integer-convertible (1). Then the 3 bit below that are
         used to encode Null/Int/Bool.
 
-        On both 32bit and 64bit, Undefined is encoded as a managed pointer with value 0. This is
-        the same as a nullptr.
+        Undefined is encoded as a managed pointer with value 0. This is the same as a nullptr.
 
         Specific bit-sequences:
         0 = always 0
@@ -102,8 +93,6 @@ private:
         x = stored value
         a,b,c,d = specific bit values, see notes
 
-        64bit:
-
         32109876 54321098 76543210 98765432 10987654 32109876 54321098 76543210 |
         66665555 55555544 44444444 33333333 33222222 22221111 11111100 00000000 | JS Value
         ------------------------------------------------------------------------+--------------
@@ -112,9 +101,9 @@ private:
         a0000000 0000bc00 00000000 00000000 00000000 00000000 00000000 00000000 | NaN/Inf
         dddddddd ddddddxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx | double
         00000000 00000010 00000000 00000000 00000000 00000000 00000000 00000000 | empty (non-sparse array hole)
-        00000000 00000011 10000000 00000000 00000000 00000000 00000000 00000000 | Null
-        00000000 00000011 01000000 00000000 00000000 00000000 00000000 0000000x | Bool
-        00000000 00000011 00100000 00000000 xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx | Int
+        00000000 00000010 10000000 00000000 00000000 00000000 00000000 00000000 | Null
+        00000000 00000011 00000000 00000000 00000000 00000000 00000000 0000000x | Bool
+        00000000 00000011 10000000 00000000 xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx | Int
 
         Notes:
         - a: xor-ed signbit, always 1 for NaN
@@ -128,31 +117,8 @@ private:
         - Null, Bool, and Int have bit 48 set, indicating integer-convertible
         - xoring _val with NaNEncodeMask will convert to a double in "natural" representation, where
           any non double results in a NaN
-
-        32bit:
-
-        32109876 54321098 76543210 98765432 10987654 32109876 54321098 76543210 |
-        66665555 55555544 44444444 33333333 33222222 22221111 11111100 00000000 | JS Value
-        ------------------------------------------------------------------------+--------------
-        01111111 11111100 00000000 00000000 00000000 00000000 00000000 00000000 | Undefined
-        01111111 11111100 00000000 00000000 xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx | Managed (heap pointer)
-        a1111111 1111bc00 00000000 00000000 00000000 00000000 00000000 00000000 | NaN/Inf
-        xddddddd ddddddxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx | double
-        01111111 11111110 00000000 00000000 00000000 00000000 00000000 00000000 | empty (non-sparse array hole)
-        01111111 11111111 10000000 00000000 00000000 00000000 00000000 00000000 | Null
-        01111111 11111111 01000000 00000000 00000000 00000000 00000000 0000000x | Bool
-        01111111 11111111 00100000 00000000 xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx | Int
-
-        Notes:
-        - the upper 32 bits are the tag, the lower 32 bits the value
-        - Undefined has a nullptr in the value, Managed has a non-nullptr stored in the value
-        - a: sign bit, always 0 for NaN
-        - b,c: 00=inf, 01 = sNaN, 10 = qNaN, 11 = boxed value
-        - d: stored double value, as long as not *all* of them are 1, because that's a boxed value
-          (see above)
-        - empty, Null, Bool, and Int have bit 63 set to 0, bits 62-50 set to 1 (same as undefined
-          and managed), and bit 49 set to 1 (where undefined and managed have it set to 0)
-        - Null, Bool, and Int have bit 48 set, indicating integer-convertible
+        - on 32bit we can use the fact that addresses are 32bits wide, so the tag part (bits 32 to
+          63) are zero. No need to shift.
     */
 
     quint64 _val;
@@ -172,8 +138,9 @@ public:
     QML_NEARLY_ALWAYS_INLINE void setTagValue(quint32 tag, quint32 value) { _val = quint64(tag) << 32 | value; }
     QML_NEARLY_ALWAYS_INLINE quint32 value() const { return _val & quint64(~quint32(0)); }
     QML_NEARLY_ALWAYS_INLINE quint32 tag() const { return _val >> 32; }
+    QML_NEARLY_ALWAYS_INLINE void setTag(quint32 tag) { setTagValue(tag, value()); }
 
-#if defined(QV4_USE_64_BIT_VALUE_ENCODING)
+#if QT_POINTER_SIZE == 8
     QML_NEARLY_ALWAYS_INLINE Heap::Base *m() const
     {
         Heap::Base *b;
@@ -184,7 +151,7 @@ public:
     {
         memcpy(&_val, &b, 8);
     }
-#else // !QV4_USE_64_BIT_VALUE_ENCODING
+#elif QT_POINTER_SIZE == 4
     QML_NEARLY_ALWAYS_INLINE Heap::Base *m() const
     {
         Q_STATIC_ASSERT(sizeof(Heap::Base*) == sizeof(quint32));
@@ -199,6 +166,8 @@ public:
         memcpy(&v, &b, 4);
         setTagValue(Managed_Type_Internal, v);
     }
+#else
+#  error "unsupported pointer size"
 #endif
 
     QML_NEARLY_ALWAYS_INLINE int int_32() const
@@ -232,24 +201,37 @@ public:
         return quint32(value());
     }
 
+    // ### Fix for 32 bit (easiest solution is to set highest bit to 1 for mananged/undefined/integercompatible
+    // and use negative numbers here
+    enum QuickType {
+        QT_ManagedOrUndefined = 0,
+        QT_ManagedOrUndefined1 = 1,
+        QT_ManagedOrUndefined2 = 2,
+        QT_ManagedOrUndefined3 = 3,
+        QT_Empty = 4,
+        QT_Null = 5,
+        QT_Bool = 6,
+        QT_Int = 7
+        // all other values are doubles
+    };
+
     enum Type {
-        Undefined_Type,
-        Managed_Type,
-        Empty_Type,
-        Integer_Type,
-        Boolean_Type,
-        Null_Type,
-        Double_Type
+        Undefined_Type = 0,
+        Managed_Type = 1,
+        Empty_Type = 4,
+        Null_Type = 5,
+        Boolean_Type = 6,
+        Integer_Type = 7,
+        Double_Type = 8
     };
 
     inline Type type() const {
-        if (isUndefined()) return Undefined_Type;
-        if (isManaged()) return Managed_Type;
-        if (isEmpty()) return Empty_Type;
-        if (isInteger()) return Integer_Type;
-        if (isBoolean()) return Boolean_Type;
-        if (isNull()) return Null_Type;
-        Q_ASSERT(isDouble()); return Double_Type;
+        int t = quickType();
+        if (t < QT_Empty)
+            return _val ? Managed_Type : Undefined_Type;
+        if (t > QT_Int)
+            return Double_Type;
+        return static_cast<Type>(t);
     }
 
     // Shared between 32-bit and 64-bit encoding
@@ -262,19 +244,18 @@ public:
     enum {
         IsDouble_Shift = 64-14,
         IsManagedOrUndefined_Shift = 64-15,
-        IsIntegerConvertible_Shift = 64-16,
-        IsDoubleTag_Shift = IsDouble_Shift - Tag_Shift,
-        Managed_Type_Internal_64 = 0
+        IsIntegerConvertible_Shift = 64-15,
+        IsIntegerOrBool_Shift = 64-16,
+        QuickType_Shift = 64 - 17
     };
 
     static const quint64 Immediate_Mask_64 = 0x00020000u; // bit 49
 
     enum class ValueTypeInternal_64 {
-        Empty            = Immediate_Mask_64| 0,
-        ConvertibleToInt = Immediate_Mask_64| 0x10000u, // bit 48
-        Null             = ConvertibleToInt | 0x08000u,
-        Boolean          = ConvertibleToInt | 0x04000u,
-        Integer          = ConvertibleToInt | 0x02000u
+        Empty            = Immediate_Mask_64 | 0,
+        Null             = Immediate_Mask_64 | 0x08000u,
+        Boolean          = Immediate_Mask_64 | 0x10000u,
+        Integer          = Immediate_Mask_64 | 0x18000u
     };
 
     // Used only by 32-bit encoding
@@ -285,50 +266,44 @@ public:
     static const quint64 Immediate_Mask_32 = NotDouble_Mask | 0x00020000u | SilentNaNBit;
 
     enum class ValueTypeInternal_32 {
-        Empty            = Immediate_Mask_32| 0,
-        ConvertibleToInt = Immediate_Mask_32| 0x10000u, // bit 48
-        Null             = ConvertibleToInt | 0x08000u,
-        Boolean          = ConvertibleToInt | 0x04000u,
-        Integer          = ConvertibleToInt | 0x02000u
+        Empty            = Immediate_Mask_32 | 0,
+        Null             = Immediate_Mask_32 | 0x08000u,
+        Boolean          = Immediate_Mask_32 | 0x10000u,
+        Integer          = Immediate_Mask_32 | 0x18000u
     };
 
     enum {
-        Managed_Type_Internal_32  = NotDouble_Mask
+        Managed_Type_Internal = 0
     };
 
-#ifdef QV4_USE_64_BIT_VALUE_ENCODING
-    enum {
-        Managed_Type_Internal  = Managed_Type_Internal_64
-    };
-    static const quint64 Immediate_Mask = Immediate_Mask_64;
     using ValueTypeInternal = ValueTypeInternal_64;
-#else
-    enum {
-        Managed_Type_Internal  = Managed_Type_Internal_32
-    };
-    static const quint64 Immediate_Mask = Immediate_Mask_32;
-    using ValueTypeInternal = ValueTypeInternal_32;
-#endif
+
     enum {
         NaN_Mask = 0x7ff80000,
     };
 
+    inline quint64 quickType() const { return (_val >> QuickType_Shift); }
+
     // used internally in property
     inline bool isEmpty() const { return tag() == quint32(ValueTypeInternal::Empty); }
     inline bool isNull() const { return tag() == quint32(ValueTypeInternal::Null); }
     inline bool isBoolean() const { return tag() == quint32(ValueTypeInternal::Boolean); }
     inline bool isInteger() const { return tag() == quint32(ValueTypeInternal::Integer); }
     inline bool isNullOrUndefined() const { return isNull() || isUndefined(); }
-    inline bool isNumber() const { return isDouble() || isInteger(); }
+    inline bool isNumber() const { return quickType() >= QT_Int; }
 
-#ifdef QV4_USE_64_BIT_VALUE_ENCODING
     inline bool isUndefined() const { return _val == 0; }
     inline bool isDouble() const { return (_val >> IsDouble_Shift); }
-    inline bool isManaged() const { return !isUndefined() && ((_val >> IsManagedOrUndefined_Shift) == 0); }
+    inline bool isManaged() const { return _val && ((_val >> IsManagedOrUndefined_Shift) == 0); }
     inline bool isManagedOrUndefined() const { return ((_val >> IsManagedOrUndefined_Shift) == 0); }
 
+    inline bool isIntOrBool() const {
+        return (_val >> IsIntegerOrBool_Shift) == 3;
+    }
+
     inline bool integerCompatible() const {
-        return (_val >> IsIntegerConvertible_Shift) == 3;
+        Q_ASSERT(!isEmpty());
+        return (_val >> IsIntegerConvertible_Shift) == 1;
     }
     static inline bool integerCompatible(Value a, Value b) {
         return a.integerCompatible() && b.integerCompatible();
@@ -337,39 +312,23 @@ public:
         return a.isDouble() && b.isDouble();
     }
     inline bool isNaN() const { return (tag() & 0x7ffc0000  ) == 0x00040000; }
-#else
-    inline bool isUndefined() const { return tag() == Managed_Type_Internal && value() == 0; }
-    inline bool isDouble() const { return (tag() & NotDouble_Mask) != NotDouble_Mask; }
-    inline bool isManaged() const { return tag() == Managed_Type_Internal && !isUndefined(); }
-    inline bool isManagedOrUndefined() const { return tag() == Managed_Type_Internal; }
-    inline bool integerCompatible() const { return (tag() & quint32(ValueTypeInternal::ConvertibleToInt)) == quint32(ValueTypeInternal::ConvertibleToInt); }
-    static inline bool integerCompatible(Value a, Value b) {
-        return ((a.tag() & b.tag()) & quint32(ValueTypeInternal::ConvertibleToInt)) == quint32(ValueTypeInternal::ConvertibleToInt);
-    }
-    static inline bool bothDouble(Value a, Value b) {
-        return ((a.tag() | b.tag()) & NotDouble_Mask) != NotDouble_Mask;
-    }
-    inline bool isNaN() const { return (tag() & QV4::Value::NotDouble_Mask) == QV4::Value::NaN_Mask; }
-#endif
+
     QML_NEARLY_ALWAYS_INLINE double doubleValue() const {
         Q_ASSERT(isDouble());
         double d;
-        quint64 v = _val;
-#ifdef QV4_USE_64_BIT_VALUE_ENCODING
-        v ^= NaNEncodeMask;
-#endif
-        memcpy(&d, &v, 8);
+        Value v = *this;
+        v._val ^= NaNEncodeMask;
+        memcpy(&d, &v._val, 8);
         return d;
     }
     QML_NEARLY_ALWAYS_INLINE void setDouble(double d) {
         memcpy(&_val, &d, 8);
-#ifdef QV4_USE_64_BIT_VALUE_ENCODING
         _val ^= NaNEncodeMask;
-#endif
         Q_ASSERT(isDouble());
     }
     inline bool isString() const;
     inline bool isObject() const;
+    inline bool isFunctionObject() const;
     inline bool isInt32() {
         if (tag() == quint32(ValueTypeInternal::Integer))
             return true;
@@ -426,14 +385,31 @@ public:
     inline int toInt32() const;
     inline unsigned int toUInt32() const;
 
-    bool toBoolean() const;
+    bool toBoolean() const {
+        if (integerCompatible())
+            return static_cast<bool>(int_32());
+
+        return toBooleanImpl(*this);
+    }
+    static bool toBooleanImpl(Value val);
     double toInteger() const;
     inline double toNumber() const;
-    double toNumberImpl() const;
+    static double toNumberImpl(Value v);
+    double toNumberImpl() const { return toNumberImpl(*this); }
     QString toQStringNoThrow() const;
     QString toQString() const;
-    Heap::String *toString(ExecutionEngine *e) const;
-    Heap::Object *toObject(ExecutionEngine *e) const;
+    Heap::String *toString(ExecutionEngine *e) const {
+        if (isString())
+            return reinterpret_cast<Heap::String *>(m());
+        return toString(e, *this);
+    }
+    static Heap::String *toString(ExecutionEngine *e, Value val);
+    Heap::Object *toObject(ExecutionEngine *e) const {
+        if (isObject())
+            return reinterpret_cast<Heap::Object *>(m());
+        return toObject(e, *this);
+    }
+    static Heap::Object *toObject(ExecutionEngine *e, Value val);
 
     inline bool isPrimitive() const;
     inline bool tryIntegerConversion() {
@@ -509,6 +485,13 @@ public:
 };
 V4_ASSERT_IS_TRIVIAL(Value)
 
+inline void Value::mark(MarkStack *markStack)
+{
+    Heap::Base *o = heapObject();
+    if (o)
+        o->mark(markStack);
+}
+
 inline bool Value::isString() const
 {
     Heap::Base *b = heapObject();
@@ -520,6 +503,12 @@ inline bool Value::isObject() const
     return b && b->vtable()->isObject;
 }
 
+inline bool Value::isFunctionObject() const
+{
+    Heap::Base *b = heapObject();
+    return b && b->vtable()->isFunctionObject;
+}
+
 inline bool Value::isPrimitive() const
 {
     return !isObject();
@@ -538,7 +527,7 @@ inline double Value::toNumber() const
 #ifndef V4_BOOTSTRAP
 inline uint Value::asArrayIndex() const
 {
-#ifdef QV4_USE_64_BIT_VALUE_ENCODING
+#if QT_POINTER_SIZE == 8
     if (!isNumber())
         return UINT_MAX;
     if (isInteger())
@@ -558,8 +547,8 @@ inline uint Value::asArrayIndex() const
 
 inline bool Value::asArrayIndex(uint &idx) const
 {
-    if (!isDouble()) {
-        if (isInteger() && int_32() >= 0) {
+    if (Q_LIKELY(!isDouble())) {
+        if (Q_LIKELY(isInteger() && int_32() >= 0)) {
             idx = (uint)int_32();
             return true;
         }
@@ -593,9 +582,9 @@ struct Q_QML_PRIVATE_EXPORT Primitive : public Value
     using Value::toInt32;
     using Value::toUInt32;
 
-    static double toInteger(double fromNumber);
-    static int toInt32(double value);
-    static unsigned int toUInt32(double value);
+    static double toInteger(double d);
+    static int toInt32(double d);
+    static unsigned int toUInt32(double d);
 };
 
 inline Primitive Primitive::undefinedValue()
@@ -658,6 +647,72 @@ inline Primitive Primitive::fromUInt32(uint i)
     return v;
 }
 
+struct Double {
+    quint64 d;
+
+    Double(double dbl) {
+        memcpy(&d, &dbl, sizeof(double));
+    }
+
+    int sign() const {
+        return (d >> 63) ? -1 : 1;
+    }
+
+    bool isDenormal() const {
+        return static_cast<int>((d << 1) >> 53) == 0;
+    }
+
+    int exponent() const {
+        return static_cast<int>((d << 1) >> 53) - 1023;
+    }
+
+    quint64 significant() const {
+        quint64 m = (d << 12) >> 12;
+        if (!isDenormal())
+            m |= (static_cast<quint64>(1) << 52);
+        return m;
+    }
+
+    static int toInt32(double d) {
+        int i = static_cast<int>(d);
+        if (i == d)
+                return i;
+        return Double(d).toInt32();
+    }
+
+    int toInt32() {
+        int e = exponent() - 52;
+        if (e < 0) {
+            if (e <= -53)
+                return 0;
+            return sign() * static_cast<int>(significant() >> -e);
+        } else {
+            if (e > 31)
+                return 0;
+            return sign() * (static_cast<int>(significant()) << e);
+        }
+    }
+};
+
+inline double Primitive::toInteger(double d)
+{
+    if (std::isnan(d))
+        return +0;
+    else if (!d || std::isinf(d))
+        return d;
+    return d >= 0 ? std::floor(d) : std::ceil(d);
+}
+
+inline int Primitive::toInt32(double value)
+{
+    return Double::toInt32(value);
+}
+
+inline unsigned int Primitive::toUInt32(double d)
+{
+    return static_cast<uint>(toInt32(d));
+}
+
 struct Encode {
     static ReturnedValue undefined() {
         return Primitive::undefinedValue().rawValue();
@@ -666,33 +721,47 @@ struct Encode {
         return Primitive::nullValue().rawValue();
     }
 
-    Encode(bool b) {
+    explicit Encode(bool b) {
         val = Primitive::fromBoolean(b).rawValue();
     }
-    Encode(double d) {
+    explicit Encode(double d) {
         val = Primitive::fromDouble(d).rawValue();
     }
-    Encode(int i) {
+    explicit Encode(int i) {
         val = Primitive::fromInt32(i).rawValue();
     }
-    Encode(uint i) {
+    explicit Encode(uint i) {
         val = Primitive::fromUInt32(i).rawValue();
     }
-    Encode(ReturnedValue v) {
+    explicit Encode(ReturnedValue v) {
         val = v;
     }
+    Encode(Value v) {
+        val = v.rawValue();
+    }
 
-    Encode(Heap::Base *o) {
-        Q_ASSERT(o);
+    explicit Encode(Heap::Base *o) {
         val = Value::fromHeapObject(o).asReturnedValue();
     }
 
+    explicit Encode(Value *o) {
+        Q_ASSERT(o);
+        val = o->asReturnedValue();
+    }
+
+    static ReturnedValue smallestNumber(double d) {
+        if (static_cast<int>(d) == d && !(d == 0. && std::signbit(d)))
+            return Encode(static_cast<int>(d));
+        else
+            return Encode(d);
+    }
+
     operator ReturnedValue() const {
         return val;
     }
     quint64 val;
 private:
-    Encode(void *);
+    explicit Encode(void *);
 };
 
 template<typename T>
@@ -700,24 +769,29 @@ ReturnedValue value_convert(ExecutionEngine *e, const Value &v);
 
 inline int Value::toInt32() const
 {
-    if (isInteger())
+    if (Q_LIKELY(integerCompatible()))
         return int_32();
-    double d = isNumber() ? doubleValue() : toNumberImpl();
-
-    const double D32 = 4294967296.0;
-    const double D31 = D32 / 2.0;
 
-    if ((d >= -D31 && d < D31))
-        return static_cast<int>(d);
+    if (Q_LIKELY(isDouble()))
+        return Double::toInt32(doubleValue());
 
-    return Primitive::toInt32(d);
+    return Double::toInt32(toNumberImpl());
 }
 
 inline unsigned int Value::toUInt32() const
 {
-    return (unsigned int)toInt32();
+    return static_cast<unsigned int>(toInt32());
 }
 
+inline double Value::toInteger() const
+{
+    if (integerCompatible())
+        return int_32();
+
+    return Primitive::toInteger(isDouble() ? doubleValue() : toNumberImpl());
+}
+
+
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/jsruntime/qv4variantobject.cpp b/src/qml/jsruntime/qv4variantobject.cpp
index f2ff5d307e..00be90b3c2 100644
--- a/src/qml/jsruntime/qv4variantobject.cpp
+++ b/src/qml/jsruntime/qv4variantobject.cpp
@@ -113,17 +113,17 @@ void VariantPrototype::init()
     defineDefaultProperty(engine()->id_toString(), method_toString, 0);
 }
 
-void VariantPrototype::method_preserve(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue VariantPrototype::method_preserve(const BuiltinFunction *, CallData *callData)
 {
-    Scoped<VariantObject> o(scope, callData->thisObject.as<QV4::VariantObject>());
+    VariantObject *o = callData->thisObject.as<QV4::VariantObject>();
     if (o && o->d()->isScarce())
         o->d()->addVmePropertyReference();
     RETURN_UNDEFINED();
 }
 
-void VariantPrototype::method_destroy(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue VariantPrototype::method_destroy(const BuiltinFunction *, CallData *callData)
 {
-    Scoped<VariantObject> o(scope, callData->thisObject.as<QV4::VariantObject>());
+    VariantObject *o = callData->thisObject.as<QV4::VariantObject>();
     if (o) {
         if (o->d()->isScarce())
             o->d()->addVmePropertyReference();
@@ -132,9 +132,10 @@ void VariantPrototype::method_destroy(const BuiltinFunction *, Scope &scope, Cal
     RETURN_UNDEFINED();
 }
 
-void VariantPrototype::method_toString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue VariantPrototype::method_toString(const BuiltinFunction *b, CallData *callData)
 {
-    Scoped<VariantObject> o(scope, callData->thisObject.as<QV4::VariantObject>());
+    ExecutionEngine *v4 = b->engine();
+    VariantObject *o = callData->thisObject.as<QV4::VariantObject>();
     if (!o)
         RETURN_UNDEFINED();
     QString result = o->d()->data().toString();
@@ -143,38 +144,33 @@ void VariantPrototype::method_toString(const BuiltinFunction *, Scope &scope, Ca
                  + QLatin1String(o->d()->data().typeName())
                  + QLatin1Char(')');
     }
-    scope.result = scope.engine->newString(result);
+    return Encode(v4->newString(result));
 }
 
-void VariantPrototype::method_valueOf(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue VariantPrototype::method_valueOf(const BuiltinFunction *b, CallData *callData)
 {
-    Scoped<VariantObject> o(scope, callData->thisObject.as<QV4::VariantObject>());
+    VariantObject *o = callData->thisObject.as<QV4::VariantObject>();
     if (o) {
         QVariant v = o->d()->data();
         switch (v.type()) {
         case QVariant::Invalid:
-            scope.result = Encode::undefined();
-            return;
+            return Encode::undefined();
         case QVariant::String:
-            scope.result = scope.engine->newString(v.toString());
-            return;
+            return Encode(b->engine()->newString(v.toString()));
         case QVariant::Int:
-            scope.result = Encode(v.toInt());
-            return;
+            return Encode(v.toInt());
         case QVariant::Double:
         case QVariant::UInt:
-            scope.result = Encode(v.toDouble());
-            return;
+            return Encode(v.toDouble());
         case QVariant::Bool:
-            scope.result = Encode(v.toBool());
-            return;
+            return Encode(v.toBool());
         default:
             if (QMetaType::typeFlags(v.userType()) & QMetaType::IsEnumeration)
                 RETURN_RESULT(Encode(v.toInt()));
             break;
         }
     }
-    scope.result = callData->thisObject;
+    return callData->thisObject.asReturnedValue();
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/jsruntime/qv4variantobject_p.h b/src/qml/jsruntime/qv4variantobject_p.h
index a7c6fa320c..07b3310e91 100644
--- a/src/qml/jsruntime/qv4variantobject_p.h
+++ b/src/qml/jsruntime/qv4variantobject_p.h
@@ -108,10 +108,10 @@ public:
     V4_PROTOTYPE(objectPrototype)
     void init();
 
-    static void method_preserve(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_destroy(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_valueOf(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_preserve(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_destroy(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_toString(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_valueOf(const BuiltinFunction *, CallData *callData);
 };
 
 }
diff --git a/src/qml/jsruntime/qv4vme_moth.cpp b/src/qml/jsruntime/qv4vme_moth.cpp
index fdf47e772e..adf43812cf 100644
--- a/src/qml/jsruntime/qv4vme_moth.cpp
+++ b/src/qml/jsruntime/qv4vme_moth.cpp
@@ -53,19 +53,16 @@
 #include <private/qv4regexp_p.h>
 #include <private/qv4regexpobject_p.h>
 #include <private/qv4string_p.h>
+#include <private/qv4profiling_p.h>
+#include <private/qv4jscall_p.h>
+#include <private/qqmljavascriptexpression_p.h>
 #include <iostream>
 
 #include "qv4alloca_p.h"
 
-#undef DO_TRACE_INSTR // define to enable instruction tracing
+#include <private/qv4jit_p.h>
 
-#ifdef DO_TRACE_INSTR
-#  define TRACE_INSTR(I) qDebug("executing a %s\n", #I);
-#  define TRACE(n, str, ...) { char buf[4096]; snprintf(buf, 4096, str, __VA_ARGS__); qDebug("    %s : %s", #n, buf); }
-#else
-#  define TRACE_INSTR(I)
-#  define TRACE(n, str, ...)
-#endif // DO_TRACE_INSTR
+#undef COUNT_INSTRUCTIONS
 
 extern "C" {
 
@@ -146,7 +143,7 @@ Q_QML_EXPORT int qt_v4DebuggerHook(const char *json);
 
 #if QT_CONFIG(qml_debug)
 static int qt_v4BreakpointCount = 0;
-static bool qt_v4IsDebugging = true;
+static bool qt_v4IsDebugging = false;
 static bool qt_v4IsStepping = false;
 
 class Breakpoint
@@ -169,14 +166,6 @@ public:
 static QVector<Breakpoint> qt_v4Breakpoints;
 static Breakpoint qt_v4LastStop;
 
-static QV4::Function *qt_v4ExtractFunction(QV4::ExecutionContext *context)
-{
-    if (QV4::Function *function = context->getFunction())
-        return function;
-    else
-        return context->engine()->globalCode;
-}
-
 static void qt_v4TriggerBreakpoint(const Breakpoint &bp, QV4::Function *function)
 {
     qt_v4LastStop = bp;
@@ -223,6 +212,7 @@ int qt_v4DebuggerHook(const char *json)
         bp.fullName = ob.value(QLatin1String("fullName")).toString();
         bp.condition = ob.value(QLatin1String("condition")).toString();
         qt_v4Breakpoints.append(bp);
+        qt_v4IsDebugging = true;
         return bp.bpNumber;
     }
 
@@ -231,6 +221,7 @@ int qt_v4DebuggerHook(const char *json)
         QString fullName = ob.value(QLatin1String("fullName")).toString();
         if (qt_v4Breakpoints.last().matches(fullName, lineNumber)) {
             qt_v4Breakpoints.removeLast();
+            qt_v4IsDebugging = !qt_v4Breakpoints.isEmpty();
             return Success;
         }
         for (int i = 0; i + 1 < qt_v4Breakpoints.size(); ++i) {
@@ -251,13 +242,13 @@ int qt_v4DebuggerHook(const char *json)
     return -NoSuchCommand; // Failure.
 }
 
-static void qt_v4CheckForBreak(QV4::ExecutionContext *context)
+Q_NEVER_INLINE static void qt_v4CheckForBreak(QV4::CppStackFrame *frame)
 {
     if (!qt_v4IsStepping && !qt_v4Breakpoints.size())
         return;
 
-    const int lineNumber = context->d()->lineNumber;
-    QV4::Function *function = qt_v4ExtractFunction(context);
+    const int lineNumber = frame->lineNumber();
+    QV4::Function *function = frame->v4Function;
     QString engineName = function->sourceFile();
 
     if (engineName.isEmpty())
@@ -287,74 +278,64 @@ static void qt_v4CheckForBreak(QV4::ExecutionContext *context)
     }
 }
 
+Q_NEVER_INLINE static void debug_slowPath(QV4::ExecutionEngine *engine)
+{
+    QV4::Debugging::Debugger *debugger = engine->debugger();
+    if (debugger && debugger->pauseAtNextOpportunity())
+        debugger->maybeBreakAtInstruction();
+    if (qt_v4IsDebugging)
+        qt_v4CheckForBreak(engine->currentStackFrame);
+}
+
 #endif // QT_CONFIG(qml_debug)
 // End of debugger interface
 
 using namespace QV4;
 using namespace QV4::Moth;
 
-#define MOTH_BEGIN_INSTR_COMMON(I) { \
-    const InstrMeta<(int)Instr::I>::DataType &instr = InstrMeta<(int)Instr::I>::data(*genericInstr); \
-    code += InstrMeta<(int)Instr::I>::Size; \
-    Q_UNUSED(instr); \
-    TRACE_INSTR(I)
-
-#ifdef MOTH_THREADED_INTERPRETER
-
-#  define MOTH_BEGIN_INSTR(I) op_##I: \
-    MOTH_BEGIN_INSTR_COMMON(I)
-
-#  define MOTH_END_INSTR(I) } \
-    genericInstr = reinterpret_cast<const Instr *>(code); \
-    goto *jumpTable[genericInstr->common.instructionType]; \
-
-#else
-
-#  define MOTH_BEGIN_INSTR(I) \
-    case Instr::I: \
-    MOTH_BEGIN_INSTR_COMMON(I)
-
-#  define MOTH_END_INSTR(I) } \
-    continue;
-
-#endif
-
-#ifdef DO_TRACE_INSTR
-Param traceParam(const Param &param)
-{
-    if (param.isConstant()) {
-        qDebug("    constant\n");
-    } else if (param.isArgument()) {
-        qDebug("    argument %d@%d\n", param.index, param.scope);
-    } else if (param.isLocal()) {
-        qDebug("    local %d\n", param.index);
-    } else if (param.isTemp()) {
-        qDebug("    temp %d\n", param.index);
-    } else if (param.isScopedLocal()) {
-        qDebug("    temp %d@%d\n", param.index, param.scope);
-    } else {
-        Q_ASSERT(!"INVALID");
+#ifdef COUNT_INSTRUCTIONS
+static struct InstrCount {
+    InstrCount() {
+        fprintf(stderr, "Counting instructions...\n");
+        for (int i = 0; i < MOTH_NUM_INSTRUCTIONS(); ++i)
+            hits[i] = 0;
+    }
+    ~InstrCount() {
+        fprintf(stderr, "Instruction count:\n");
+#define BLAH(I) \
+        fprintf(stderr, "%llu : %s\n", hits[int(Instr::Type::I)], #I);
+        FOR_EACH_MOTH_INSTR(BLAH)
+        #undef BLAH
+    }
+    quint64 hits[MOTH_NUM_INSTRUCTIONS()];
+    void hit(Instr::Type i) { hits[int(i)]++; }
+} instrCount;
+#endif // COUNT_INSTRUCTIONS
+
+#define MOTH_BEGIN_INSTR_COMMON(instr) \
+    { \
+        INSTR_##instr(MOTH_DECODE)
+
+#ifdef COUNT_INSTRUCTIONS
+#  define MOTH_BEGIN_INSTR(instr) \
+    MOTH_BEGIN_INSTR_COMMON(instr) \
+    instrCount.hit(Instr::Type::instr);
+#else // !COUNT_INSTRUCTIONS
+#  define MOTH_BEGIN_INSTR(instr) \
+    MOTH_BEGIN_INSTR_COMMON(instr)
+#endif // COUNT_INSTRUCTIONS
+
+#ifdef MOTH_COMPUTED_GOTO
+#define MOTH_END_INSTR(instr) \
+        MOTH_DISPATCH() \
+    }
+#else // !MOTH_COMPUTED_GOTO
+#define MOTH_END_INSTR(instr) \
+        continue; \
     }
-    return param;
-}
-# define VALUE(param) (*VALUEPTR(param))
-# define VALUEPTR(param) (scopes[traceParam(param).scope].values + param.index)
-#else
-# define VALUE(param) (*VALUEPTR(param))
-# define VALUEPTR(param) (scopes[param.scope].values + param.index)
 #endif
 
-// ### add write barrier here
-#define STOREVALUE(param, value) { \
-    QV4::ReturnedValue tmp = (value); \
-    if (engine->hasException) \
-        goto catchException; \
-    if (Q_LIKELY(!engine->writeBarrierActive || !scopes[param.scope].base)) { \
-        VALUE(param) = tmp; \
-    } else { \
-        QV4::WriteBarrier::write(engine, scopes[param.scope].base, VALUEPTR(param), QV4::Value::fromReturnedValue(tmp)); \
-    } \
-}
+#define STACK_VALUE(temp) stack[temp]
 
 // qv4scopedvalue_p.h also defines a CHECK_EXCEPTION macro
 #ifdef CHECK_EXCEPTION
@@ -364,617 +345,1038 @@ Param traceParam(const Param &param)
     if (engine->hasException) \
         goto catchException
 
-QV4::ReturnedValue VME::run(ExecutionEngine *engine, const uchar *code)
+static inline Heap::CallContext *getScope(Value *stack, int level)
 {
-#ifdef DO_TRACE_INSTR
-    qDebug("Starting VME with context=%p and code=%p", context, code);
-#endif // DO_TRACE_INSTR
+    Heap::ExecutionContext *scope = static_cast<ExecutionContext &>(stack[CallData::Context]).d();
+    while (level > 0) {
+        --level;
+        scope = scope->outer;
+    }
+    Q_ASSERT(scope);
+    return static_cast<Heap::CallContext *>(scope);
+}
 
-    qt_v4ResolvePendingBreakpointsHook();
+static inline const QV4::Value &constant(Function *function, int index)
+{
+    return function->compilationUnit->constants[index];
+}
 
-#ifdef MOTH_THREADED_INTERPRETER
-#define MOTH_INSTR_ADDR(I, FMT) &&op_##I,
-    static void *jumpTable[] = {
-        FOR_EACH_MOTH_INSTR(MOTH_INSTR_ADDR)
-    };
-#undef MOTH_INSTR_ADDR
-#endif
 
-    QV4::Value *stack = 0;
-    unsigned stackSize = 0;
+static bool compareEqual(Value lhs, Value rhs)
+{
+  redo:
+    if (lhs.asReturnedValue() == rhs.asReturnedValue())
+        return !lhs.isNaN();
+
+    int lt = lhs.quickType();
+    int rt = rhs.quickType();
+    if (rt < lt) {
+        qSwap(lhs, rhs);
+        qSwap(lt, rt);
+    }
 
-    const uchar *exceptionHandler = 0;
+    switch (lt) {
+    case Value::QT_ManagedOrUndefined:
+        if (lhs.isUndefined())
+            return rhs.isNullOrUndefined();
+        Q_FALLTHROUGH();
+    case Value::QT_ManagedOrUndefined1:
+    case Value::QT_ManagedOrUndefined2:
+    case Value::QT_ManagedOrUndefined3:
+        // LHS: Managed
+        switch (rt) {
+        case Value::QT_ManagedOrUndefined:
+            if (rhs.isUndefined())
+                return false;
+            Q_FALLTHROUGH();
+        case Value::QT_ManagedOrUndefined1:
+        case Value::QT_ManagedOrUndefined2:
+        case Value::QT_ManagedOrUndefined3: {
+            // RHS: Managed
+            Heap::Base *l = lhs.m();
+            Heap::Base *r = rhs.m();
+            Q_ASSERT(l);
+            Q_ASSERT(r);
+            if (l->vtable()->isString == r->vtable()->isString)
+                return static_cast<QV4::Managed &>(lhs).isEqualTo(&static_cast<QV4::Managed &>(rhs));
+            if (l->vtable()->isString) {
+                rhs = Primitive::fromReturnedValue(RuntimeHelpers::objectDefaultValue(&static_cast<QV4::Object &>(rhs), PREFERREDTYPE_HINT));
+                break;
+            } else {
+                Q_ASSERT(r->vtable()->isString);
+                lhs = Primitive::fromReturnedValue(RuntimeHelpers::objectDefaultValue(&static_cast<QV4::Object &>(lhs), PREFERREDTYPE_HINT));
+                break;
+            }
+            return false;
+        }
+        case Value::QT_Empty:
+            Q_UNREACHABLE();
+        case Value::QT_Null:
+            return false;
+        case Value::QT_Bool:
+        case Value::QT_Int:
+            rhs = Primitive::fromDouble(rhs.int_32());
+            // fall through
+        default: // double
+            if (lhs.m()->vtable()->isString)
+                return RuntimeHelpers::toNumber(lhs) == rhs.doubleValue();
+            else
+                lhs = Primitive::fromReturnedValue(RuntimeHelpers::objectDefaultValue(&static_cast<QV4::Object &>(lhs), PREFERREDTYPE_HINT));
+        }
+        goto redo;
+    case Value::QT_Empty:
+        Q_UNREACHABLE();
+    case Value::QT_Null:
+        return rhs.isNull();
+    case Value::QT_Bool:
+    case Value::QT_Int:
+        switch (rt) {
+        case Value::QT_ManagedOrUndefined:
+        case Value::QT_ManagedOrUndefined1:
+        case Value::QT_ManagedOrUndefined2:
+        case Value::QT_ManagedOrUndefined3:
+        case Value::QT_Empty:
+        case Value::QT_Null:
+            Q_UNREACHABLE();
+        case Value::QT_Bool:
+        case Value::QT_Int:
+            return lhs.int_32() == rhs.int_32();
+        default: // double
+            return lhs.int_32() == rhs.doubleValue();
+        }
+    default: // double
+        Q_ASSERT(rhs.isDouble());
+        return lhs.doubleValue() == rhs.doubleValue();
+    }
+}
 
-    QV4::Scope scope(engine);
-    engine->current->lineNumber = -1;
+static bool compareEqualInt(Value &accumulator, Value lhs, int rhs)
+{
+  redo:
+    switch (lhs.quickType()) {
+    case Value::QT_ManagedOrUndefined:
+        if (lhs.isUndefined())
+            return false;
+        Q_FALLTHROUGH();
+    case Value::QT_ManagedOrUndefined1:
+    case Value::QT_ManagedOrUndefined2:
+    case Value::QT_ManagedOrUndefined3:
+        // LHS: Managed
+        if (lhs.m()->vtable()->isString)
+            return RuntimeHelpers::stringToNumber(static_cast<String &>(lhs).toQString()) == rhs;
+        accumulator = lhs;
+        lhs = Primitive::fromReturnedValue(RuntimeHelpers::objectDefaultValue(&static_cast<QV4::Object &>(accumulator), PREFERREDTYPE_HINT));
+        goto redo;
+    case Value::QT_Empty:
+        Q_UNREACHABLE();
+    case Value::QT_Null:
+        return false;
+    case Value::QT_Bool:
+    case Value::QT_Int:
+        return lhs.int_32() == rhs;
+    default: // double
+        return lhs.doubleValue() == rhs;
+    }
+}
 
-#ifdef DO_TRACE_INSTR
-    qDebug("Starting VME with context=%p and code=%p", context, code);
-#endif // DO_TRACE_INSTR
+#define STORE_IP() frame.instructionPointer = int(code - codeStart);
+#define STORE_ACC() accumulator = acc;
+#define ACC Primitive::fromReturnedValue(acc)
+#define VALUE_TO_INT(i, val) \
+    int i; \
+    do { \
+        if (Q_LIKELY(val.integerCompatible())) { \
+            i = val.int_32(); \
+        } else { \
+            double d; \
+            if (val.isDouble()) \
+                d = val.doubleValue(); \
+            else { \
+                d = val.toNumberImpl(); \
+                CHECK_EXCEPTION; \
+            } \
+            i = Double::toInt32(d); \
+        } \
+    } while (false)
+
+QV4::ReturnedValue VME::exec(const FunctionObject *fo, const Value *thisObject, const Value *argv, int argc)
+{
+    qt_v4ResolvePendingBreakpointsHook();
+    ExecutionEngine *engine;
+    Value *stack;
+    CppStackFrame frame;
+    frame.originalArguments = argv;
+    frame.originalArgumentsCount = argc;
+    Function *function;
 
-    // setup lookup scopes
-    int scopeDepth = 0;
     {
-        QV4::Heap::ExecutionContext *scope = engine->current;
-        while (scope) {
-            ++scopeDepth;
-            scope = scope->outer;
+        Heap::ExecutionContext *scope;
+
+        quintptr d = reinterpret_cast<quintptr>(fo);
+        if (d & 0x1) {
+            // we don't have a FunctionObject, but a ExecData
+            ExecData *data = reinterpret_cast<ExecData *>(d - 1);
+            function = data->function;
+            scope = data->scope->d();
+            fo = nullptr;
+        } else {
+            function = fo->function();
+            scope = fo->scope();
         }
+
+        engine = function->internalClass->engine;
+
+        stack = engine->jsStackTop;
+        CallData *callData = reinterpret_cast<CallData *>(stack);
+        callData->function = fo ? fo->asReturnedValue() : Encode::undefined();
+        callData->context = scope;
+        callData->accumulator = Encode::undefined();
+        callData->thisObject = thisObject ? *thisObject : Primitive::undefinedValue();
+        if (argc > int(function->nFormals))
+            argc = int(function->nFormals);
+        callData->setArgc(argc);
+
+        int jsStackFrameSize = offsetof(CallData, args)/sizeof(Value) + function->compiledFunction->nRegisters;
+        engine->jsStackTop += jsStackFrameSize;
+        memcpy(callData->args, argv, argc*sizeof(Value));
+        for (Value *v = callData->args + argc; v < engine->jsStackTop; ++v)
+            *v = Encode::undefined();
+
+        frame.parent = engine->currentStackFrame;
+        frame.v4Function = function;
+        frame.instructionPointer = 0;
+        frame.jsFrame = callData;
+        engine->currentStackFrame = &frame;
     }
+    CHECK_STACK_LIMITS(engine);
 
-    struct Scopes {
-        QV4::Value *values;
-        QV4::Heap::Base *base; // non 0 if a write barrier is required
-    };
-    Q_ALLOCA_VAR(Scopes, scopes, sizeof(Scopes)*(2 + 2*scopeDepth));
-    {
-        scopes[0] = { const_cast<QV4::Value *>(static_cast<CompiledData::CompilationUnit*>(engine->current->compilationUnit)->constants), 0 };
-        // stack gets setup in push instruction
-        scopes[1] = { 0, 0 };
-        QV4::Heap::ExecutionContext *scope = engine->current;
-        int i = 0;
-        while (scope) {
-            if (scope->type == QV4::Heap::ExecutionContext::Type_SimpleCallContext) {
-                QV4::Heap::SimpleCallContext *cc = static_cast<QV4::Heap::SimpleCallContext *>(scope);
-                scopes[2*i + 2] = { cc->callData->args, 0 };
-                scopes[2*i + 3] = { 0, 0 };
-            } else if (scope->type == QV4::Heap::ExecutionContext::Type_CallContext) {
-                QV4::Heap::CallContext *cc = static_cast<QV4::Heap::CallContext *>(scope);
-                scopes[2*i + 2] = { cc->callData->args, cc };
-                scopes[2*i + 3] = { cc->locals.values, cc };
-            } else {
-                scopes[2*i + 2] = { 0, 0 };
-                scopes[2*i + 3] = { 0, 0 };
-            }
-            ++i;
-            scope = scope->outer;
-        }
+    Profiling::FunctionCallProfiler profiler(engine, function); // start execution profiling
+    QV4::Debugging::Debugger *debugger = engine->debugger();
+
+    const uchar *exceptionHandler = 0;
+
+    QV4::Value &accumulator = frame.jsFrame->accumulator;
+    QV4::ReturnedValue acc = Encode::undefined();
+
+#ifdef V4_ENABLE_JIT
+    static const bool forceInterpreter = qEnvironmentVariableIsSet("QV4_FORCE_INTERPRETER");
+    if (function->jittedCode == nullptr) {
+        if (ExecutionEngine::canJIT() && debugger == nullptr && !forceInterpreter)
+            QV4::JIT::BaselineJIT(function).generate();
     }
+#endif // V4_ENABLE_JIT
+
+    if (debugger)
+        debugger->enteringFunction();
 
+    if (function->jittedCode != nullptr && debugger == nullptr) {
+        acc = function->jittedCode(&frame, engine);
+    } else {
+    // interpreter
+    const uchar *code = function->codeData;
+    const uchar *codeStart = code;
+
+    MOTH_JUMP_TABLE;
 
     for (;;) {
-        const Instr *genericInstr = reinterpret_cast<const Instr *>(code);
-#ifdef MOTH_THREADED_INTERPRETER
-        goto *jumpTable[genericInstr->common.instructionType];
-#else
-        switch (genericInstr->common.instructionType) {
-#endif
+    MOTH_DISPATCH()
+    Q_UNREACHABLE(); // only reached when the dispatch doesn't jump somewhere
+
+    MOTH_BEGIN_INSTR(LoadConst)
+        acc = constant(function, index).asReturnedValue();
+    MOTH_END_INSTR(LoadConst)
+
+    MOTH_BEGIN_INSTR(LoadNull)
+        acc = Encode::null();
+    MOTH_END_INSTR(LoadNull)
+
+    MOTH_BEGIN_INSTR(LoadZero)
+        acc = Encode(static_cast<int>(0));
+    MOTH_END_INSTR(LoadZero)
 
-    MOTH_BEGIN_INSTR(Move)
-        VALUE(instr.result) = VALUE(instr.source);
-    MOTH_END_INSTR(Move)
+    MOTH_BEGIN_INSTR(LoadTrue)
+        acc = Encode(true);
+    MOTH_END_INSTR(LoadTrue)
+
+    MOTH_BEGIN_INSTR(LoadFalse)
+        acc = Encode(false);
+    MOTH_END_INSTR(LoadFalse)
+
+    MOTH_BEGIN_INSTR(LoadUndefined)
+        acc = Encode::undefined();
+    MOTH_END_INSTR(LoadUndefined)
+
+    MOTH_BEGIN_INSTR(LoadInt)
+        acc = Encode(value);
+    MOTH_END_INSTR(LoadInt)
 
     MOTH_BEGIN_INSTR(MoveConst)
-        VALUE(instr.result) = instr.source;
+        STACK_VALUE(destTemp) = constant(function, constIndex);
     MOTH_END_INSTR(MoveConst)
 
-    MOTH_BEGIN_INSTR(SwapTemps)
-        qSwap(VALUE(instr.left),  VALUE(instr.right));
-    MOTH_END_INSTR(MoveTemp)
+    MOTH_BEGIN_INSTR(LoadReg)
+        acc = STACK_VALUE(reg).asReturnedValue();
+    MOTH_END_INSTR(LoadReg)
+
+    MOTH_BEGIN_INSTR(StoreReg)
+        STACK_VALUE(reg) = acc;
+    MOTH_END_INSTR(StoreReg)
+
+    MOTH_BEGIN_INSTR(MoveReg)
+        STACK_VALUE(destReg) = STACK_VALUE(srcReg);
+    MOTH_END_INSTR(MoveReg)
+
+    MOTH_BEGIN_INSTR(LoadLocal)
+        auto cc = static_cast<Heap::CallContext *>(stack[CallData::Context].m());
+        acc = cc->locals[index].asReturnedValue();
+    MOTH_END_INSTR(LoadLocal)
+
+    MOTH_BEGIN_INSTR(StoreLocal)
+        CHECK_EXCEPTION;
+        auto cc = static_cast<Heap::CallContext *>(stack[CallData::Context].m());
+        QV4::WriteBarrier::write(engine, cc, cc->locals.values + index, ACC);
+    MOTH_END_INSTR(StoreLocal)
+
+    MOTH_BEGIN_INSTR(LoadScopedLocal)
+        auto cc = getScope(stack, scope);
+        acc = cc->locals[index].asReturnedValue();
+    MOTH_END_INSTR(LoadScopedLocal)
+
+    MOTH_BEGIN_INSTR(StoreScopedLocal)
+        CHECK_EXCEPTION;
+        auto cc = getScope(stack, scope);
+        QV4::WriteBarrier::write(engine, cc, cc->locals.values + index, ACC);
+    MOTH_END_INSTR(StoreScopedLocal)
 
     MOTH_BEGIN_INSTR(LoadRuntimeString)
-//        TRACE(value, "%s", instr.value.toString(context)->toQString().toUtf8().constData());
-        VALUE(instr.result) = engine->current->compilationUnit->runtimeStrings[instr.stringId];
+        acc = function->compilationUnit->runtimeStrings[stringId]->asReturnedValue();
     MOTH_END_INSTR(LoadRuntimeString)
 
     MOTH_BEGIN_INSTR(LoadRegExp)
-//        TRACE(value, "%s", instr.value.toString(context)->toQString().toUtf8().constData());
-        Heap::RegExpObject *ro = engine->newRegExpObject(
-                static_cast<CompiledData::CompilationUnit*>(engine->current->compilationUnit)
-                        ->runtimeRegularExpressions[instr.regExpId].as<RegExp>());
-        VALUE(instr.result) = ro;
+        acc = Runtime::method_regexpLiteral(engine, regExpId);
     MOTH_END_INSTR(LoadRegExp)
 
     MOTH_BEGIN_INSTR(LoadClosure)
-        STOREVALUE(instr.result, Runtime::method_closure(engine, instr.value));
+        acc = Runtime::method_closure(engine, value);
     MOTH_END_INSTR(LoadClosure)
 
     MOTH_BEGIN_INSTR(LoadName)
-        TRACE(inline, "property name = %s", runtimeStrings[instr.name]->toQString().toUtf8().constData());
-        STOREVALUE(instr.result, Runtime::method_getActivationProperty(engine, instr.name));
+        STORE_IP();
+        acc = Runtime::method_loadName(engine, name);
+        CHECK_EXCEPTION;
     MOTH_END_INSTR(LoadName)
 
-    MOTH_BEGIN_INSTR(GetGlobalLookup)
-        QV4::Lookup *l = engine->current->lookups + instr.index;
-        STOREVALUE(instr.result, l->globalGetter(l, engine));
-    MOTH_END_INSTR(GetGlobalLookup)
+    MOTH_BEGIN_INSTR(LoadGlobalLookup)
+        QV4::Lookup *l = function->compilationUnit->runtimeLookups + index;
+        acc = l->globalGetter(l, engine);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(LoadGlobalLookup)
+
+    MOTH_BEGIN_INSTR(StoreNameStrict)
+        STORE_IP();
+        STORE_ACC();
+        Runtime::method_storeNameStrict(engine, name, accumulator);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(StoreNameStrict)
 
-    MOTH_BEGIN_INSTR(StoreName)
-        TRACE(inline, "property name = %s", runtimeStrings[instr.name]->toQString().toUtf8().constData());
-        Runtime::method_setActivationProperty(engine, instr.name, VALUE(instr.source));
+    MOTH_BEGIN_INSTR(StoreNameSloppy)
+        STORE_IP();
+        STORE_ACC();
+        Runtime::method_storeNameSloppy(engine, name, accumulator);
         CHECK_EXCEPTION;
-    MOTH_END_INSTR(StoreName)
+    MOTH_END_INSTR(StoreNameSloppy)
 
     MOTH_BEGIN_INSTR(LoadElement)
-        STOREVALUE(instr.result, Runtime::method_getElement(engine, VALUE(instr.base), VALUE(instr.index)));
+        STORE_IP();
+        acc = Runtime::method_loadElement(engine, STACK_VALUE(base), STACK_VALUE(index));
+        CHECK_EXCEPTION;
     MOTH_END_INSTR(LoadElement)
 
-    MOTH_BEGIN_INSTR(LoadElementLookup)
-        QV4::Lookup *l = engine->current->lookups + instr.lookup;
-        STOREVALUE(instr.result, l->indexedGetter(l, engine, VALUE(instr.base), VALUE(instr.index)));
-    MOTH_END_INSTR(LoadElementLookup)
+    MOTH_BEGIN_INSTR(LoadElementA)
+        STORE_IP();
+        STORE_ACC();
+        acc = Runtime::method_loadElement(engine, STACK_VALUE(base), accumulator);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(LoadElementA)
 
     MOTH_BEGIN_INSTR(StoreElement)
-        Runtime::method_setElement(engine, VALUE(instr.base), VALUE(instr.index), VALUE(instr.source));
+        STORE_IP();
+        STORE_ACC();
+        if (!Runtime::method_storeElement(engine, STACK_VALUE(base), STACK_VALUE(index), accumulator) && function->isStrict())
+            engine->throwTypeError();
         CHECK_EXCEPTION;
     MOTH_END_INSTR(StoreElement)
 
-    MOTH_BEGIN_INSTR(StoreElementLookup)
-        QV4::Lookup *l = engine->current->lookups + instr.lookup;
-        l->indexedSetter(l, engine, VALUE(instr.base), VALUE(instr.index), VALUE(instr.source));
-        CHECK_EXCEPTION;
-    MOTH_END_INSTR(StoreElementLookup)
-
     MOTH_BEGIN_INSTR(LoadProperty)
-        STOREVALUE(instr.result, Runtime::method_getProperty(engine, VALUE(instr.base), instr.name));
+        STORE_IP();
+        acc = Runtime::method_loadProperty(engine, STACK_VALUE(base), name);
+        CHECK_EXCEPTION;
     MOTH_END_INSTR(LoadProperty)
 
+    MOTH_BEGIN_INSTR(LoadPropertyA)
+        STORE_IP();
+        STORE_ACC();
+        acc = Runtime::method_loadProperty(engine, accumulator, name);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(LoadPropertyA)
+
     MOTH_BEGIN_INSTR(GetLookup)
-        QV4::Lookup *l = engine->current->lookups + instr.index;
-        STOREVALUE(instr.result, l->getter(l, engine, VALUE(instr.base)));
+        STORE_IP();
+        QV4::Lookup *l = function->compilationUnit->runtimeLookups + index;
+        acc = l->getter(l, engine, STACK_VALUE(base));
+        CHECK_EXCEPTION;
     MOTH_END_INSTR(GetLookup)
 
+    MOTH_BEGIN_INSTR(GetLookupA)
+        STORE_IP();
+        STORE_ACC();
+        QV4::Lookup *l = function->compilationUnit->runtimeLookups + index;
+        acc = l->getter(l, engine, accumulator);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(GetLookupA)
+
     MOTH_BEGIN_INSTR(StoreProperty)
-        Runtime::method_setProperty(engine, VALUE(instr.base), instr.name, VALUE(instr.source));
+        STORE_IP();
+        STORE_ACC();
+        if (!Runtime::method_storeProperty(engine, STACK_VALUE(base), name, accumulator) && function->isStrict())
+            engine->throwTypeError();
         CHECK_EXCEPTION;
     MOTH_END_INSTR(StoreProperty)
 
     MOTH_BEGIN_INSTR(SetLookup)
-        QV4::Lookup *l = engine->current->lookups + instr.index;
-        l->setter(l, engine, VALUE(instr.base), VALUE(instr.source));
+        STORE_IP();
+        STORE_ACC();
+        QV4::Lookup *l = function->compilationUnit->runtimeLookups + index;
+        if (!l->setter(l, engine, STACK_VALUE(base), accumulator) && function->isStrict())
+            engine->throwTypeError();
         CHECK_EXCEPTION;
     MOTH_END_INSTR(SetLookup)
 
-    MOTH_BEGIN_INSTR(StoreQObjectProperty)
-        Runtime::method_setQmlQObjectProperty(engine, VALUE(instr.base), instr.propertyIndex, VALUE(instr.source));
-        CHECK_EXCEPTION;
-    MOTH_END_INSTR(StoreQObjectProperty)
-
-    MOTH_BEGIN_INSTR(LoadQObjectProperty)
-        STOREVALUE(instr.result, Runtime::method_getQmlQObjectProperty(engine, VALUE(instr.base), instr.propertyIndex, instr.captureRequired));
-    MOTH_END_INSTR(LoadQObjectProperty)
-
     MOTH_BEGIN_INSTR(StoreScopeObjectProperty)
-        Runtime::method_setQmlScopeObjectProperty(engine, VALUE(instr.base), instr.propertyIndex, VALUE(instr.source));
+        STORE_ACC();
+        Runtime::method_storeQmlScopeObjectProperty(engine, STACK_VALUE(base), propertyIndex, accumulator);
         CHECK_EXCEPTION;
     MOTH_END_INSTR(StoreScopeObjectProperty)
 
     MOTH_BEGIN_INSTR(LoadScopeObjectProperty)
-        STOREVALUE(instr.result, Runtime::method_getQmlScopeObjectProperty(engine, VALUE(instr.base), instr.propertyIndex, instr.captureRequired));
+        STORE_IP();
+        acc = Runtime::method_loadQmlScopeObjectProperty(engine, STACK_VALUE(base), propertyIndex, captureRequired);
+        CHECK_EXCEPTION;
     MOTH_END_INSTR(LoadScopeObjectProperty)
 
     MOTH_BEGIN_INSTR(StoreContextObjectProperty)
-        Runtime::method_setQmlContextObjectProperty(engine, VALUE(instr.base), instr.propertyIndex, VALUE(instr.source));
+        STORE_IP();
+        STORE_ACC();
+        Runtime::method_storeQmlContextObjectProperty(engine, STACK_VALUE(base), propertyIndex, accumulator);
         CHECK_EXCEPTION;
     MOTH_END_INSTR(StoreContextObjectProperty)
 
     MOTH_BEGIN_INSTR(LoadContextObjectProperty)
-        STOREVALUE(instr.result, Runtime::method_getQmlContextObjectProperty(engine, VALUE(instr.base), instr.propertyIndex, instr.captureRequired));
+        STORE_IP();
+        acc = Runtime::method_loadQmlContextObjectProperty(engine, STACK_VALUE(base), propertyIndex, captureRequired);
+        CHECK_EXCEPTION;
     MOTH_END_INSTR(LoadContextObjectProperty)
 
     MOTH_BEGIN_INSTR(LoadIdObject)
-        STOREVALUE(instr.result, Runtime::method_getQmlIdObject(engine, VALUE(instr.base), instr.index));
+        STORE_IP();
+        acc = Runtime::method_loadQmlIdObject(engine, STACK_VALUE(base), index);
+        CHECK_EXCEPTION;
     MOTH_END_INSTR(LoadIdObject)
 
-    MOTH_BEGIN_INSTR(LoadAttachedQObjectProperty)
-        STOREVALUE(instr.result, Runtime::method_getQmlAttachedProperty(engine, instr.attachedPropertiesId, instr.propertyIndex));
-    MOTH_END_INSTR(LoadAttachedQObjectProperty)
-
-    MOTH_BEGIN_INSTR(LoadSingletonQObjectProperty)
-        STOREVALUE(instr.result, Runtime::method_getQmlSingletonQObjectProperty(engine, VALUE(instr.base), instr.propertyIndex, instr.captureRequired));
-    MOTH_END_INSTR(LoadSingletonQObjectProperty)
-
-    MOTH_BEGIN_INSTR(Push)
-        TRACE(inline, "stack size: %u", instr.value);
-        stackSize = instr.value;
-        stack = scope.alloc(stackSize);
-        scopes[1].values = stack;
-    MOTH_END_INSTR(Push)
-
     MOTH_BEGIN_INSTR(CallValue)
-#if 0 //def DO_TRACE_INSTR
-        if (Debugging::Debugger *debugger = context->engine()->debugger) {
-            if (QV4::FunctionObject *o = (VALUE(instr.dest)).asFunctionObject()) {
-                if (Debugging::FunctionDebugInfo *info = debugger->debugInfo(o)) {
-                    QString n = debugger->name(o);
-                    std::cerr << "*** Call to \"" << (n.isNull() ? "<no name>" : qPrintable(n)) << "\" defined @" << info->startLine << ":" << info->startColumn << std::endl;
-                }
-            }
+        STORE_IP();
+        STORE_ACC();
+        Value func = Value::fromReturnedValue(acc);
+        if (Q_UNLIKELY(!func.isFunctionObject())) {
+            acc = engine->throwTypeError(QStringLiteral("%1 is not a function").arg(func.toQStringNoThrow()));
+            goto catchException;
         }
-#endif // DO_TRACE_INSTR
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = QV4::Primitive::undefinedValue();
-        STOREVALUE(instr.result, Runtime::method_callValue(engine, VALUE(instr.dest), callData));
+        acc = static_cast<const FunctionObject &>(func).call(nullptr, stack + argv, argc);
+        CHECK_EXCEPTION;
     MOTH_END_INSTR(CallValue)
 
     MOTH_BEGIN_INSTR(CallProperty)
-        TRACE(property name, "%s, args=%u, argc=%u, this=%s", qPrintable(runtimeStrings[instr.name]->toQString()), instr.callData, instr.argc, (VALUE(instr.base)).toString(engine)->toQString().toUtf8().constData());
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = VALUE(instr.base);
-        STOREVALUE(instr.result, Runtime::method_callProperty(engine, instr.name, callData));
+        STORE_IP();
+        acc = Runtime::method_callProperty(engine, stack + base, name, stack + argv, argc);
+        CHECK_EXCEPTION;
     MOTH_END_INSTR(CallProperty)
 
     MOTH_BEGIN_INSTR(CallPropertyLookup)
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = VALUE(instr.base);
-        STOREVALUE(instr.result, Runtime::method_callPropertyLookup(engine, instr.lookupIndex, callData));
-    MOTH_END_INSTR(CallPropertyLookup)
+        STORE_IP();
+        Lookup *l = function->compilationUnit->runtimeLookups + lookupIndex;
+        // ok to have the value on the stack here
+        Value f = Value::fromReturnedValue(l->getter(l, engine, stack[base]));
+
+        if (Q_UNLIKELY(!f.isFunctionObject())) {
+            acc = engine->throwTypeError();
+            goto catchException;
+        }
 
-    MOTH_BEGIN_INSTR(CallScopeObjectProperty)
-        TRACE(property name, "%s, args=%u, argc=%u, this=%s", qPrintable(runtimeStrings[instr.name]->toQString()), instr.callData, instr.argc, (VALUE(instr.base)).toString(engine)->toQString().toUtf8().constData());
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = VALUE(instr.base);
-        STOREVALUE(instr.result, Runtime::method_callQmlScopeObjectProperty(engine, instr.index, callData));
-    MOTH_END_INSTR(CallScopeObjectProperty)
-
-    MOTH_BEGIN_INSTR(CallContextObjectProperty)
-        TRACE(property name, "%s, args=%u, argc=%u, this=%s", qPrintable(runtimeStrings[instr.name]->toQString()), instr.callData, instr.argc, (VALUE(instr.base)).toString(engine)->toQString().toUtf8().constData());
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = VALUE(instr.base);
-        STOREVALUE(instr.result, Runtime::method_callQmlContextObjectProperty(engine, instr.index, callData));
-    MOTH_END_INSTR(CallContextObjectProperty)
+        acc = static_cast<FunctionObject &>(f).call(stack + base, stack + argv, argc);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(CallPropertyLookup)
 
     MOTH_BEGIN_INSTR(CallElement)
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = VALUE(instr.base);
-        STOREVALUE(instr.result, Runtime::method_callElement(engine, VALUE(instr.index), callData));
+        STORE_IP();
+        acc = Runtime::method_callElement(engine, stack + base, STACK_VALUE(index), stack + argv, argc);
+        CHECK_EXCEPTION;
     MOTH_END_INSTR(CallElement)
 
-    MOTH_BEGIN_INSTR(CallActivationProperty)
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = QV4::Primitive::undefinedValue();
-        STOREVALUE(instr.result, Runtime::method_callActivationProperty(engine, instr.name, callData));
-    MOTH_END_INSTR(CallActivationProperty)
+    MOTH_BEGIN_INSTR(CallName)
+        STORE_IP();
+        acc = Runtime::method_callName(engine, name, stack + argv, argc);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(CallName)
+
+    MOTH_BEGIN_INSTR(CallPossiblyDirectEval)
+        STORE_IP();
+        acc = Runtime::method_callPossiblyDirectEval(engine, stack + argv, argc);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(CallPossiblyDirectEval)
 
     MOTH_BEGIN_INSTR(CallGlobalLookup)
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = QV4::Primitive::undefinedValue();
-        STOREVALUE(instr.result, Runtime::method_callGlobalLookup(engine, instr.index, callData));
+        STORE_IP();
+        acc = Runtime::method_callGlobalLookup(engine, index, stack + argv, argc);
+        CHECK_EXCEPTION;
     MOTH_END_INSTR(CallGlobalLookup)
 
     MOTH_BEGIN_INSTR(SetExceptionHandler)
-        exceptionHandler = instr.offset ? ((const uchar *)&instr.offset) + instr.offset : 0;
+        exceptionHandler = offset ? code + offset : nullptr;
     MOTH_END_INSTR(SetExceptionHandler)
 
-    MOTH_BEGIN_INSTR(CallBuiltinThrow)
-        Runtime::method_throwException(engine, VALUE(instr.arg));
+    MOTH_BEGIN_INSTR(ThrowException)
+        STORE_IP();
+        STORE_ACC();
+        Runtime::method_throwException(engine, accumulator);
+        goto catchException;
+    MOTH_END_INSTR(ThrowException)
+
+    MOTH_BEGIN_INSTR(GetException)
+        acc = engine->hasException ? engine->exceptionValue->asReturnedValue()
+                                   : Primitive::emptyValue().asReturnedValue();
+        engine->hasException = false;
+    MOTH_END_INSTR(HasException)
+
+    MOTH_BEGIN_INSTR(SetException)
+        *engine->exceptionValue = acc;
+        engine->hasException = true;
+    MOTH_END_INSTR(SetException)
+
+    MOTH_BEGIN_INSTR(PushCatchContext)
+        STACK_VALUE(reg) = STACK_VALUE(CallData::Context);
+        ExecutionContext *c = static_cast<ExecutionContext *>(stack + CallData::Context);
+        STACK_VALUE(CallData::Context) = Runtime::method_createCatchContext(c, name);
+    MOTH_END_INSTR(PushCatchContext)
+
+    MOTH_BEGIN_INSTR(CreateCallContext)
+        stack[CallData::Context] = ExecutionContext::newCallContext(&frame);
+    MOTH_END_INSTR(CreateCallContext)
+
+    MOTH_BEGIN_INSTR(PushWithContext)
+        STORE_IP();
+        STORE_ACC();
+        accumulator = accumulator.toObject(engine);
+        CHECK_EXCEPTION;
+        STACK_VALUE(reg) = STACK_VALUE(CallData::Context);
+        ExecutionContext *c = static_cast<ExecutionContext *>(stack + CallData::Context);
+        STACK_VALUE(CallData::Context) = Runtime::method_createWithContext(c, accumulator);
+    MOTH_END_INSTR(PushWithContext)
+
+    MOTH_BEGIN_INSTR(PopContext)
+        STACK_VALUE(CallData::Context) = STACK_VALUE(reg);
+    MOTH_END_INSTR(PopContext)
+
+    MOTH_BEGIN_INSTR(ForeachIteratorObject)
+        STORE_ACC();
+        acc = Runtime::method_foreachIterator(engine, accumulator);
         CHECK_EXCEPTION;
-    MOTH_END_INSTR(CallBuiltinThrow)
+    MOTH_END_INSTR(ForeachIteratorObject)
 
-    MOTH_BEGIN_INSTR(CallBuiltinUnwindException)
-        STOREVALUE(instr.result, Runtime::method_unwindException(engine));
-    MOTH_END_INSTR(CallBuiltinUnwindException)
+    MOTH_BEGIN_INSTR(ForeachNextPropertyName)
+        STORE_ACC();
+        acc = Runtime::method_foreachNextPropertyName(accumulator);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(ForeachNextPropertyName)
+
+    MOTH_BEGIN_INSTR(DeleteMember)
+        if (!Runtime::method_deleteMember(engine, STACK_VALUE(base), member)) {
+            if (function->isStrict()) {
+                STORE_IP();
+                engine->throwTypeError();
+                goto catchException;
+            }
+            acc = Encode(false);
+        } else {
+            acc = Encode(true);
+        }
+    MOTH_END_INSTR(DeleteMember)
+
+    MOTH_BEGIN_INSTR(DeleteSubscript)
+        if (!Runtime::method_deleteElement(engine, STACK_VALUE(base), STACK_VALUE(index))) {
+            if (function->isStrict()) {
+                STORE_IP();
+                engine->throwTypeError();
+                goto catchException;
+            }
+            acc = Encode(false);
+        } else {
+            acc = Encode(true);
+        }
+    MOTH_END_INSTR(DeleteSubscript)
+
+    MOTH_BEGIN_INSTR(DeleteName)
+        if (!Runtime::method_deleteName(engine, name)) {
+            if (function->isStrict()) {
+                STORE_IP();
+                QString n = function->compilationUnit->runtimeStrings[name]->toQString();
+                engine->throwSyntaxError(QStringLiteral("Can't delete property %1").arg(n));
+                goto catchException;
+            }
+            acc = Encode(false);
+        } else {
+            acc = Encode(true);
+        }
+    MOTH_END_INSTR(DeleteName)
+
+    MOTH_BEGIN_INSTR(TypeofName)
+        acc = Runtime::method_typeofName(engine, name);
+    MOTH_END_INSTR(TypeofName)
+
+    MOTH_BEGIN_INSTR(TypeofValue)
+        STORE_ACC();
+        acc = Runtime::method_typeofValue(engine, accumulator);
+    MOTH_END_INSTR(TypeofValue)
+
+    MOTH_BEGIN_INSTR(DeclareVar)
+        Runtime::method_declareVar(engine, isDeletable, varName);
+    MOTH_END_INSTR(DeclareVar)
+
+    MOTH_BEGIN_INSTR(DefineArray)
+        QV4::Value *arguments = stack + args;
+        acc = Runtime::method_arrayLiteral(engine, arguments, argc);
+    MOTH_END_INSTR(DefineArray)
+
+    MOTH_BEGIN_INSTR(DefineObjectLiteral)
+        QV4::Value *arguments = stack + args;
+        acc = Runtime::method_objectLiteral(engine, arguments, internalClassId, arrayValueCount, arrayGetterSetterCountAndFlags);
+    MOTH_END_INSTR(DefineObjectLiteral)
+
+    MOTH_BEGIN_INSTR(CreateMappedArgumentsObject)
+        acc = Runtime::method_createMappedArgumentsObject(engine);
+    MOTH_END_INSTR(CreateMappedArgumentsObject)
+
+    MOTH_BEGIN_INSTR(CreateUnmappedArgumentsObject)
+        acc = Runtime::method_createUnmappedArgumentsObject(engine);
+    MOTH_END_INSTR(CreateUnmappedArgumentsObject)
+
+    MOTH_BEGIN_INSTR(ConvertThisToObject)
+        Value *t = &stack[CallData::This];
+        if (!t->isObject()) {
+            if (t->isNullOrUndefined()) {
+                *t = engine->globalObject->asReturnedValue();
+            } else {
+                *t = t->toObject(engine)->asReturnedValue();
+                CHECK_EXCEPTION;
+            }
+        }
+    MOTH_END_INSTR(ConvertThisToObject)
 
-    MOTH_BEGIN_INSTR(CallBuiltinPushCatchScope)
-        Runtime::method_pushCatchScope(static_cast<QV4::NoThrowEngine*>(engine), instr.name);
-    MOTH_END_INSTR(CallBuiltinPushCatchScope)
-
-    MOTH_BEGIN_INSTR(CallBuiltinPushScope)
-        Runtime::method_pushWithScope(VALUE(instr.arg), static_cast<QV4::NoThrowEngine*>(engine));
-        CHECK_EXCEPTION;
-    MOTH_END_INSTR(CallBuiltinPushScope)
-
-    MOTH_BEGIN_INSTR(CallBuiltinPopScope)
-        Runtime::method_popScope(static_cast<QV4::NoThrowEngine*>(engine));
-    MOTH_END_INSTR(CallBuiltinPopScope)
-
-    MOTH_BEGIN_INSTR(CallBuiltinForeachIteratorObject)
-        STOREVALUE(instr.result, Runtime::method_foreachIterator(engine, VALUE(instr.arg)));
-    MOTH_END_INSTR(CallBuiltinForeachIteratorObject)
-
-    MOTH_BEGIN_INSTR(CallBuiltinForeachNextPropertyName)
-        STOREVALUE(instr.result, Runtime::method_foreachNextPropertyName(VALUE(instr.arg)));
-    MOTH_END_INSTR(CallBuiltinForeachNextPropertyName)
-
-    MOTH_BEGIN_INSTR(CallBuiltinDeleteMember)
-        STOREVALUE(instr.result, Runtime::method_deleteMember(engine, VALUE(instr.base), instr.member));
-    MOTH_END_INSTR(CallBuiltinDeleteMember)
-
-    MOTH_BEGIN_INSTR(CallBuiltinDeleteSubscript)
-        STOREVALUE(instr.result, Runtime::method_deleteElement(engine, VALUE(instr.base), VALUE(instr.index)));
-    MOTH_END_INSTR(CallBuiltinDeleteSubscript)
-
-    MOTH_BEGIN_INSTR(CallBuiltinDeleteName)
-        STOREVALUE(instr.result, Runtime::method_deleteName(engine, instr.name));
-    MOTH_END_INSTR(CallBuiltinDeleteName)
-
-    MOTH_BEGIN_INSTR(CallBuiltinTypeofScopeObjectProperty)
-        STOREVALUE(instr.result, Runtime::method_typeofScopeObjectProperty(engine, VALUE(instr.base), instr.index));
-    MOTH_END_INSTR(CallBuiltinTypeofMember)
-
-    MOTH_BEGIN_INSTR(CallBuiltinTypeofContextObjectProperty)
-        STOREVALUE(instr.result, Runtime::method_typeofContextObjectProperty(engine, VALUE(instr.base), instr.index));
-    MOTH_END_INSTR(CallBuiltinTypeofMember)
-
-    MOTH_BEGIN_INSTR(CallBuiltinTypeofMember)
-        STOREVALUE(instr.result, Runtime::method_typeofMember(engine, VALUE(instr.base), instr.member));
-    MOTH_END_INSTR(CallBuiltinTypeofMember)
-
-    MOTH_BEGIN_INSTR(CallBuiltinTypeofSubscript)
-        STOREVALUE(instr.result, Runtime::method_typeofElement(engine, VALUE(instr.base), VALUE(instr.index)));
-    MOTH_END_INSTR(CallBuiltinTypeofSubscript)
-
-    MOTH_BEGIN_INSTR(CallBuiltinTypeofName)
-        STOREVALUE(instr.result, Runtime::method_typeofName(engine, instr.name));
-    MOTH_END_INSTR(CallBuiltinTypeofName)
-
-    MOTH_BEGIN_INSTR(CallBuiltinTypeofValue)
-        STOREVALUE(instr.result, Runtime::method_typeofValue(engine, VALUE(instr.value)));
-    MOTH_END_INSTR(CallBuiltinTypeofValue)
-
-    MOTH_BEGIN_INSTR(CallBuiltinDeclareVar)
-        Runtime::method_declareVar(engine, instr.isDeletable, instr.varName);
-    MOTH_END_INSTR(CallBuiltinDeclareVar)
-
-    MOTH_BEGIN_INSTR(CallBuiltinDefineArray)
-        Q_ASSERT(instr.args + instr.argc <= stackSize);
-        QV4::Value *args = stack + instr.args;
-        STOREVALUE(instr.result, Runtime::method_arrayLiteral(engine, args, instr.argc));
-    MOTH_END_INSTR(CallBuiltinDefineArray)
-
-    MOTH_BEGIN_INSTR(CallBuiltinDefineObjectLiteral)
-        QV4::Value *args = stack + instr.args;
-    STOREVALUE(instr.result, Runtime::method_objectLiteral(engine, args, instr.internalClassId, instr.arrayValueCount, instr.arrayGetterSetterCountAndFlags));
-    MOTH_END_INSTR(CallBuiltinDefineObjectLiteral)
-
-    MOTH_BEGIN_INSTR(CallBuiltinSetupArgumentsObject)
-        STOREVALUE(instr.result, Runtime::method_setupArgumentsObject(engine));
-    MOTH_END_INSTR(CallBuiltinSetupArgumentsObject)
-
-    MOTH_BEGIN_INSTR(CallBuiltinConvertThisToObject)
-        Runtime::method_convertThisToObject(engine);
-        CHECK_EXCEPTION;
-    MOTH_END_INSTR(CallBuiltinConvertThisToObject)
-
-    MOTH_BEGIN_INSTR(CreateValue)
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = QV4::Primitive::undefinedValue();
-        STOREVALUE(instr.result, Runtime::method_constructValue(engine, VALUE(instr.func), callData));
-    MOTH_END_INSTR(CreateValue)
-
-    MOTH_BEGIN_INSTR(CreateProperty)
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = VALUE(instr.base);
-        STOREVALUE(instr.result, Runtime::method_constructProperty(engine, instr.name, callData));
-    MOTH_END_INSTR(CreateProperty)
-
-    MOTH_BEGIN_INSTR(ConstructPropertyLookup)
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = VALUE(instr.base);
-        STOREVALUE(instr.result, Runtime::method_constructPropertyLookup(engine, instr.index, callData));
-    MOTH_END_INSTR(ConstructPropertyLookup)
-
-    MOTH_BEGIN_INSTR(CreateActivationProperty)
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = QV4::Primitive::undefinedValue();
-        STOREVALUE(instr.result, Runtime::method_constructActivationProperty(engine, instr.name, callData));
-    MOTH_END_INSTR(CreateActivationProperty)
-
-    MOTH_BEGIN_INSTR(ConstructGlobalLookup)
-        Q_ASSERT(instr.callData + instr.argc + offsetof(QV4::CallData, args)/sizeof(QV4::Value) <= stackSize);
-        QV4::CallData *callData = reinterpret_cast<QV4::CallData *>(stack + instr.callData);
-        callData->tag = quint32(Value::ValueTypeInternal::Integer);
-        callData->argc = instr.argc;
-        callData->thisObject = QV4::Primitive::undefinedValue();
-        STOREVALUE(instr.result, Runtime::method_constructGlobalLookup(engine, instr.index, callData));
-    MOTH_END_INSTR(ConstructGlobalLookup)
+    MOTH_BEGIN_INSTR(Construct)
+        STORE_IP();
+        acc = Runtime::method_construct(engine, STACK_VALUE(func), stack + argv, argc);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(Construct)
 
     MOTH_BEGIN_INSTR(Jump)
-        code = ((const uchar *)&instr.offset) + instr.offset;
+        code += offset;
     MOTH_END_INSTR(Jump)
 
-    MOTH_BEGIN_INSTR(JumpEq)
-        bool cond = VALUEPTR(instr.condition)->toBoolean();
-        TRACE(condition, "%s", cond ? "TRUE" : "FALSE");
-        if (cond)
-            code = ((const uchar *)&instr.offset) + instr.offset;
-    MOTH_END_INSTR(JumpEq)
+    MOTH_BEGIN_INSTR(JumpTrue)
+        if (Q_LIKELY(ACC.integerCompatible())) {
+            if (ACC.int_32())
+                code += offset;
+        } else {
+            if (ACC.toBoolean())
+                code += offset;
+        }
+    MOTH_END_INSTR(JumpTrue)
+
+    MOTH_BEGIN_INSTR(JumpFalse)
+        if (Q_LIKELY(ACC.integerCompatible())) {
+            if (!ACC.int_32())
+                code += offset;
+        } else {
+            if (!ACC.toBoolean())
+                code += offset;
+        }
+    MOTH_END_INSTR(JumpFalse)
+
+    MOTH_BEGIN_INSTR(CmpEqNull)
+        acc = Encode(ACC.isNullOrUndefined());
+    MOTH_END_INSTR(CmpEqNull)
+
+    MOTH_BEGIN_INSTR(CmpNeNull)
+        acc = Encode(!ACC.isNullOrUndefined());
+    MOTH_END_INSTR(CmpNeNull)
+
+    MOTH_BEGIN_INSTR(CmpEqInt)
+        if (ACC.isIntOrBool()) {
+            acc = Encode(ACC.int_32() == lhs);
+        } else {
+            STORE_ACC();
+            acc = Encode(compareEqualInt(accumulator, ACC, lhs));
+            CHECK_EXCEPTION;
+        }
+    MOTH_END_INSTR(CmpEqInt)
+
+    MOTH_BEGIN_INSTR(CmpNeInt)
+        if (ACC.isIntOrBool()) {
+            acc = Encode(bool(ACC.int_32() != lhs));
+        } else {
+            STORE_ACC();
+            acc = Encode(!compareEqualInt(accumulator, ACC, lhs));
+            CHECK_EXCEPTION;
+        }
+    MOTH_END_INSTR(CmpNeInt)
+
+    MOTH_BEGIN_INSTR(CmpEq)
+        const Value left = STACK_VALUE(lhs);
+        if (Q_LIKELY(left.asReturnedValue() == ACC.asReturnedValue())) {
+            acc = Encode(!ACC.isNaN());
+        } else if (Q_LIKELY(left.isInteger() && ACC.isInteger())) {
+            acc = Encode(left.int_32() == ACC.int_32());
+        } else {
+            STORE_ACC();
+            acc = Encode(compareEqual(left, accumulator));
+            CHECK_EXCEPTION;
+        }
+    MOTH_END_INSTR(CmpEq)
+
+    MOTH_BEGIN_INSTR(CmpNe)
+        const Value left = STACK_VALUE(lhs);
+        if (Q_LIKELY(left.isInteger() && ACC.isInteger())) {
+            acc = Encode(bool(left.int_32() != ACC.int_32()));
+        } else {
+            STORE_ACC();
+            acc = Encode(!compareEqual(left, accumulator));
+            CHECK_EXCEPTION;
+        }
+    MOTH_END_INSTR(CmpNe)
+
+    MOTH_BEGIN_INSTR(CmpGt)
+        const Value left = STACK_VALUE(lhs);
+        if (Q_LIKELY(left.isInteger() && ACC.isInteger())) {
+            acc = Encode(left.int_32() > ACC.int_32());
+        } else if (left.isNumber() && ACC.isNumber()) {
+            acc = Encode(left.asDouble() > ACC.asDouble());
+        } else {
+            STORE_ACC();
+            acc = Encode(bool(Runtime::method_compareGreaterThan(left, accumulator)));
+            CHECK_EXCEPTION;
+        }
+    MOTH_END_INSTR(CmpGt)
+
+    MOTH_BEGIN_INSTR(CmpGe)
+        const Value left = STACK_VALUE(lhs);
+        if (Q_LIKELY(left.isInteger() && ACC.isInteger())) {
+            acc = Encode(left.int_32() >= ACC.int_32());
+        } else if (left.isNumber() && ACC.isNumber()) {
+            acc = Encode(left.asDouble() >= ACC.asDouble());
+        } else {
+            STORE_ACC();
+            acc = Encode(bool(Runtime::method_compareGreaterEqual(left, accumulator)));
+            CHECK_EXCEPTION;
+        }
+    MOTH_END_INSTR(CmpGe)
+
+    MOTH_BEGIN_INSTR(CmpLt)
+        const Value left = STACK_VALUE(lhs);
+        if (Q_LIKELY(left.isInteger() && ACC.isInteger())) {
+            acc = Encode(left.int_32() < ACC.int_32());
+        } else if (left.isNumber() && ACC.isNumber()) {
+            acc = Encode(left.asDouble() < ACC.asDouble());
+        } else {
+            STORE_ACC();
+            acc = Encode(bool(Runtime::method_compareLessThan(left, accumulator)));
+            CHECK_EXCEPTION;
+        }
+    MOTH_END_INSTR(CmpLt)
+
+    MOTH_BEGIN_INSTR(CmpLe)
+        const Value left = STACK_VALUE(lhs);
+        if (Q_LIKELY(left.isInteger() && ACC.isInteger())) {
+            acc = Encode(left.int_32() <= ACC.int_32());
+        } else if (left.isNumber() && ACC.isNumber()) {
+            acc = Encode(left.asDouble() <= ACC.asDouble());
+        } else {
+            STORE_ACC();
+            acc = Encode(bool(Runtime::method_compareLessEqual(left, accumulator)));
+            CHECK_EXCEPTION;
+        }
+    MOTH_END_INSTR(CmpLe)
+
+    MOTH_BEGIN_INSTR(CmpStrictEqual)
+        if (STACK_VALUE(lhs).rawValue() == ACC.rawValue() && !ACC.isNaN()) {
+            acc = Encode(true);
+        } else {
+            STORE_ACC();
+            acc = Encode(bool(RuntimeHelpers::strictEqual(STACK_VALUE(lhs), accumulator)));
+            CHECK_EXCEPTION;
+        }
+    MOTH_END_INSTR(CmpStrictEqual)
+
+    MOTH_BEGIN_INSTR(CmpStrictNotEqual)
+        if (STACK_VALUE(lhs).rawValue() != ACC.rawValue() || ACC.isNaN()) {
+            STORE_ACC();
+            acc = Encode(!RuntimeHelpers::strictEqual(STACK_VALUE(lhs), accumulator));
+            CHECK_EXCEPTION;
+        } else {
+            acc = Encode(false);
+        }
+    MOTH_END_INSTR(CmpStrictNotEqual)
+
+    MOTH_BEGIN_INSTR(CmpIn)
+        STORE_ACC();
+        acc = Runtime::method_in(engine, STACK_VALUE(lhs), accumulator);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(CmpIn)
+
+    MOTH_BEGIN_INSTR(CmpInstanceOf)
+        // 11.8.6, 5: rval must be an Object
+        const Object *rhs = Primitive::fromReturnedValue(acc).as<Object>();
+        if (Q_UNLIKELY(!rhs)) {
+           acc = engine->throwTypeError();
+           goto catchException;
+        }
+
+        // 11.8.6, 7: call "HasInstance", which we term instanceOf, and return the result.
+        acc = rhs->instanceOf(STACK_VALUE(lhs));
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(CmpInstanceOf)
+
+    MOTH_BEGIN_INSTR(JumpStrictNotEqualStackSlotInt)
+        if (STACK_VALUE(lhs).int_32() != rhs || STACK_VALUE(lhs).isUndefined())
+            code += offset;
+    MOTH_END_INSTR(JumpStrictNotEqualStackSlotInt)
 
-    MOTH_BEGIN_INSTR(JumpNe)
-        bool cond = VALUEPTR(instr.condition)->toBoolean();
-        TRACE(condition, "%s", cond ? "TRUE" : "FALSE");
-        if (!cond)
-            code = ((const uchar *)&instr.offset) + instr.offset;
-    MOTH_END_INSTR(JumpNe)
+    MOTH_BEGIN_INSTR(JumpStrictEqualStackSlotInt)
+        if (STACK_VALUE(lhs).int_32() == rhs && !STACK_VALUE(lhs).isUndefined())
+            code += offset;
+    MOTH_END_INSTR(JumpStrictNotEqualStackSlotInt)
 
     MOTH_BEGIN_INSTR(UNot)
-        STOREVALUE(instr.result, Runtime::method_uNot(VALUE(instr.source)));
+        if (ACC.integerCompatible()) {
+            acc = Encode(!static_cast<bool>(ACC.int_32()));
+        } else {
+            acc = Encode(!Value::toBooleanImpl(ACC));
+        }
     MOTH_END_INSTR(UNot)
 
-    MOTH_BEGIN_INSTR(UNotBool)
-        bool b = VALUE(instr.source).booleanValue();
-        VALUE(instr.result) = QV4::Encode(!b);
-    MOTH_END_INSTR(UNotBool)
-
     MOTH_BEGIN_INSTR(UPlus)
-        STOREVALUE(instr.result, Runtime::method_uPlus(VALUE(instr.source)));
+        if (Q_UNLIKELY(!ACC.isNumber())) {
+            acc = Encode(ACC.toNumberImpl());
+            CHECK_EXCEPTION;
+        }
     MOTH_END_INSTR(UPlus)
 
     MOTH_BEGIN_INSTR(UMinus)
-        STOREVALUE(instr.result, Runtime::method_uMinus(VALUE(instr.source)));
+        if (Q_LIKELY(ACC.integerCompatible())) {
+            int a = ACC.int_32();
+            if (a == 0 || a == std::numeric_limits<int>::min()) {
+                acc = Encode(-static_cast<double>(a));
+            } else {
+                acc = sub_int32(0, ACC.int_32());
+            }
+        } else if (ACC.isDouble()) {
+            acc ^= (1ull << 63); // simply flip sign bit
+        } else {
+            acc = Encode(-ACC.toNumberImpl());
+            CHECK_EXCEPTION;
+        }
     MOTH_END_INSTR(UMinus)
 
     MOTH_BEGIN_INSTR(UCompl)
-        STOREVALUE(instr.result, Runtime::method_complement(VALUE(instr.source)));
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(~a);
     MOTH_END_INSTR(UCompl)
 
-    MOTH_BEGIN_INSTR(UComplInt)
-        VALUE(instr.result) = QV4::Encode((int)~VALUE(instr.source).integerValue());
-    MOTH_END_INSTR(UComplInt)
-
     MOTH_BEGIN_INSTR(Increment)
-        STOREVALUE(instr.result, Runtime::method_increment(VALUE(instr.source)));
+        if (Q_LIKELY(ACC.integerCompatible())) {
+            acc = add_int32(ACC.int_32(), 1);
+        } else if (ACC.isDouble()) {
+            acc = QV4::Encode(ACC.doubleValue() + 1.);
+        } else {
+            acc = Encode(ACC.toNumberImpl() + 1.);
+            CHECK_EXCEPTION;
+        }
     MOTH_END_INSTR(Increment)
 
     MOTH_BEGIN_INSTR(Decrement)
-        STOREVALUE(instr.result, Runtime::method_decrement(VALUE(instr.source)));
+        if (Q_LIKELY(ACC.integerCompatible())) {
+            acc = sub_int32(ACC.int_32(), 1);
+        } else if (ACC.isDouble()) {
+            acc = QV4::Encode(ACC.doubleValue() - 1.);
+        } else {
+            acc = Encode(ACC.toNumberImpl() - 1.);
+            CHECK_EXCEPTION;
+        }
     MOTH_END_INSTR(Decrement)
 
-    MOTH_BEGIN_INSTR(Binop)
-        QV4::Runtime::BinaryOperation op = *reinterpret_cast<QV4::Runtime::BinaryOperation *>(reinterpret_cast<char *>(&engine->runtime.runtimeMethods[instr.alu]));
-        STOREVALUE(instr.result, op(VALUE(instr.lhs), VALUE(instr.rhs)));
-    MOTH_END_INSTR(Binop)
-
     MOTH_BEGIN_INSTR(Add)
-        STOREVALUE(instr.result, Runtime::method_add(engine, VALUE(instr.lhs), VALUE(instr.rhs)));
+        const Value left = STACK_VALUE(lhs);
+        if (Q_LIKELY(Value::integerCompatible(left, ACC))) {
+            acc = add_int32(left.int_32(), ACC.int_32());
+        } else if (left.isNumber() && ACC.isNumber()) {
+            acc = Encode(left.asDouble() + ACC.asDouble());
+        } else {
+            STORE_ACC();
+            acc = Runtime::method_add(engine, left, accumulator);
+            CHECK_EXCEPTION;
+        }
     MOTH_END_INSTR(Add)
 
+    MOTH_BEGIN_INSTR(Sub)
+        const Value left = STACK_VALUE(lhs);
+        if (Q_LIKELY(Value::integerCompatible(left, ACC))) {
+            acc = sub_int32(left.int_32(), ACC.int_32());
+        } else if (left.isNumber() && ACC.isNumber()) {
+            acc = Encode(left.asDouble() - ACC.asDouble());
+        } else {
+            STORE_ACC();
+            acc = Runtime::method_sub(left, accumulator);
+            CHECK_EXCEPTION;
+        }
+    MOTH_END_INSTR(Sub)
+
+    MOTH_BEGIN_INSTR(Mul)
+        const Value left = STACK_VALUE(lhs);
+        if (Q_LIKELY(Value::integerCompatible(left, ACC))) {
+            acc = mul_int32(left.int_32(), ACC.int_32());
+        } else if (left.isNumber() && ACC.isNumber()) {
+            acc = Encode(left.asDouble() * ACC.asDouble());
+        } else {
+            STORE_ACC();
+            acc = Runtime::method_mul(left, accumulator);
+            CHECK_EXCEPTION;
+        }
+    MOTH_END_INSTR(Mul)
+
+    MOTH_BEGIN_INSTR(Div)
+        STORE_ACC();
+        acc = Runtime::method_div(STACK_VALUE(lhs), accumulator);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(Div)
+
+    MOTH_BEGIN_INSTR(Mod)
+        STORE_ACC();
+        acc = Runtime::method_mod(STACK_VALUE(lhs), accumulator);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(Mod)
+
     MOTH_BEGIN_INSTR(BitAnd)
-        STOREVALUE(instr.result, Runtime::method_bitAnd(VALUE(instr.lhs), VALUE(instr.rhs)));
+        VALUE_TO_INT(l, STACK_VALUE(lhs));
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(l & a);
     MOTH_END_INSTR(BitAnd)
 
     MOTH_BEGIN_INSTR(BitOr)
-        STOREVALUE(instr.result, Runtime::method_bitOr(VALUE(instr.lhs), VALUE(instr.rhs)));
+        VALUE_TO_INT(l, STACK_VALUE(lhs));
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(l | a);
     MOTH_END_INSTR(BitOr)
 
     MOTH_BEGIN_INSTR(BitXor)
-        STOREVALUE(instr.result, Runtime::method_bitXor(VALUE(instr.lhs), VALUE(instr.rhs)));
+        VALUE_TO_INT(l, STACK_VALUE(lhs));
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(l ^ a);
     MOTH_END_INSTR(BitXor)
 
+    MOTH_BEGIN_INSTR(UShr)
+        uint l = STACK_VALUE(lhs).toUInt32();
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(l >> uint(a & 0x1f));
+    MOTH_END_INSTR(UShr)
+
     MOTH_BEGIN_INSTR(Shr)
-        STOREVALUE(instr.result, QV4::Encode((int)(VALUEPTR(instr.lhs)->toInt32() >> (VALUEPTR(instr.rhs)->toInt32() & 0x1f))));
+        VALUE_TO_INT(l, STACK_VALUE(lhs));
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(l >> (a & 0x1f));
     MOTH_END_INSTR(Shr)
 
     MOTH_BEGIN_INSTR(Shl)
-        STOREVALUE(instr.result, QV4::Encode((int)(VALUEPTR(instr.lhs)->toInt32() << (VALUEPTR(instr.rhs)->toInt32() & 0x1f))));
+        VALUE_TO_INT(l, STACK_VALUE(lhs));
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(l << (a & 0x1f));
     MOTH_END_INSTR(Shl)
 
     MOTH_BEGIN_INSTR(BitAndConst)
-        int lhs = VALUEPTR(instr.lhs)->toInt32();
-        STOREVALUE(instr.result, QV4::Encode((int)(lhs & instr.rhs)));
-    MOTH_END_INSTR(BitAnd)
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(a & rhs);
+        CHECK_EXCEPTION;
+    MOTH_END_INSTR(BitAndConst)
 
     MOTH_BEGIN_INSTR(BitOrConst)
-        int lhs = VALUEPTR(instr.lhs)->toInt32();
-        STOREVALUE(instr.result, QV4::Encode((int)(lhs | instr.rhs)));
-    MOTH_END_INSTR(BitOr)
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(a | rhs);
+    MOTH_END_INSTR(BitOrConst)
 
     MOTH_BEGIN_INSTR(BitXorConst)
-        int lhs = VALUEPTR(instr.lhs)->toInt32();
-        STOREVALUE(instr.result, QV4::Encode((int)(lhs ^ instr.rhs)));
-    MOTH_END_INSTR(BitXor)
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(a ^ rhs);
+    MOTH_END_INSTR(BitXorConst)
+
+    MOTH_BEGIN_INSTR(UShrConst)
+        acc = Encode(ACC.toUInt32() >> uint(rhs));
+    MOTH_END_INSTR(UShrConst)
 
     MOTH_BEGIN_INSTR(ShrConst)
-        STOREVALUE(instr.result, QV4::Encode((int)(VALUEPTR(instr.lhs)->toInt32() >> instr.rhs)));
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(a >> rhs);
     MOTH_END_INSTR(ShrConst)
 
     MOTH_BEGIN_INSTR(ShlConst)
-        STOREVALUE(instr.result, QV4::Encode((int)(VALUEPTR(instr.lhs)->toInt32() << instr.rhs)));
+        VALUE_TO_INT(a, ACC);
+        acc = Encode(a << rhs);
     MOTH_END_INSTR(ShlConst)
 
-    MOTH_BEGIN_INSTR(Mul)
-        STOREVALUE(instr.result, Runtime::method_mul(VALUE(instr.lhs), VALUE(instr.rhs)));
-    MOTH_END_INSTR(Mul)
-
-    MOTH_BEGIN_INSTR(Sub)
-        STOREVALUE(instr.result, Runtime::method_sub(VALUE(instr.lhs), VALUE(instr.rhs)));
-    MOTH_END_INSTR(Sub)
-
-    MOTH_BEGIN_INSTR(BinopContext)
-        QV4::Runtime::BinaryOperationContext op = *reinterpret_cast<QV4::Runtime::BinaryOperationContext *>(reinterpret_cast<char *>(&engine->runtime.runtimeMethods[instr.alu]));
-        STOREVALUE(instr.result, op(engine, VALUE(instr.lhs), VALUE(instr.rhs)));
-    MOTH_END_INSTR(BinopContext)
-
     MOTH_BEGIN_INSTR(Ret)
-//        TRACE(Ret, "returning value %s", result.toString(context)->toQString().toUtf8().constData());
-        return VALUE(instr.result).asReturnedValue();
+        goto functionExit;
     MOTH_END_INSTR(Ret)
 
 #if QT_CONFIG(qml_debug)
     MOTH_BEGIN_INSTR(Debug)
-        engine->current->lineNumber = instr.lineNumber;
-        QV4::Debugging::Debugger *debugger = engine->debugger();
-        if (debugger && debugger->pauseAtNextOpportunity())
-            debugger->maybeBreakAtInstruction();
-        if (qt_v4IsDebugging)
-            qt_v4CheckForBreak(engine->currentContext);
+        STORE_IP();
+        debug_slowPath(engine);
     MOTH_END_INSTR(Debug)
-
-    MOTH_BEGIN_INSTR(Line)
-        engine->current->lineNumber = instr.lineNumber;
-        if (qt_v4IsDebugging)
-            qt_v4CheckForBreak(engine->currentContext);
-    MOTH_END_INSTR(Line)
 #endif // QT_CONFIG(qml_debug)
 
-    MOTH_BEGIN_INSTR(LoadThis)
-        VALUE(instr.result) = engine->currentContext->thisObject();
-    MOTH_END_INSTR(LoadThis)
-
     MOTH_BEGIN_INSTR(LoadQmlContext)
-        VALUE(instr.result) = Runtime::method_getQmlContext(static_cast<QV4::NoThrowEngine*>(engine));
+        STACK_VALUE(result) = Runtime::method_loadQmlContext(static_cast<QV4::NoThrowEngine*>(engine));
     MOTH_END_INSTR(LoadQmlContext)
 
     MOTH_BEGIN_INSTR(LoadQmlImportedScripts)
-        VALUE(instr.result) = Runtime::method_getQmlImportedScripts(static_cast<QV4::NoThrowEngine*>(engine));
+        STACK_VALUE(result) = Runtime::method_loadQmlImportedScripts(static_cast<QV4::NoThrowEngine*>(engine));
     MOTH_END_INSTR(LoadQmlImportedScripts)
 
     MOTH_BEGIN_INSTR(LoadQmlSingleton)
-        VALUE(instr.result) = Runtime::method_getQmlSingleton(static_cast<QV4::NoThrowEngine*>(engine), instr.name);
+        acc = Runtime::method_loadQmlSingleton(static_cast<QV4::NoThrowEngine*>(engine), name);
     MOTH_END_INSTR(LoadQmlSingleton)
 
-#ifdef MOTH_THREADED_INTERPRETER
-    // nothing to do
-#else
-        default:
-            qFatal("QQmlJS::Moth::VME: Internal error - unknown instruction %d", genericInstr->common.instructionType);
-            break;
-        }
-#endif
-
-        Q_ASSERT(false);
     catchException:
         Q_ASSERT(engine->hasException);
-        if (!exceptionHandler)
-            return QV4::Encode::undefined();
+        if (!exceptionHandler) {
+            acc = Encode::undefined();
+            goto functionExit;
+        }
         code = exceptionHandler;
     }
-}
+    }
 
-QV4::ReturnedValue VME::exec(ExecutionEngine *engine, const uchar *code)
-{
-    VME vme;
-    QV4::Debugging::Debugger *debugger = engine->debugger();
-    if (debugger)
-        debugger->enteringFunction();
-    QV4::ReturnedValue retVal = vme.run(engine, code);
-    if (debugger)
-        debugger->leavingFunction(retVal);
-    return retVal;
+functionExit:
+    if (QV4::Debugging::Debugger *debugger = engine->debugger())
+        debugger->leavingFunction(ACC.asReturnedValue());
+    engine->currentStackFrame = frame.parent;
+    engine->jsStackTop = stack;
+
+    return acc;
 }
diff --git a/src/qml/jsruntime/qv4vme_moth_p.h b/src/qml/jsruntime/qv4vme_moth_p.h
index 8d46207f2b..dbf9ed3550 100644
--- a/src/qml/jsruntime/qv4vme_moth_p.h
+++ b/src/qml/jsruntime/qv4vme_moth_p.h
@@ -52,8 +52,6 @@
 //
 
 #include <private/qv4global_p.h>
-#include <private/qv4runtime_p.h>
-#include <private/qv4instr_moth_p.h>
 
 QT_REQUIRE_CONFIG(qml_interpreter);
 
@@ -65,10 +63,17 @@ namespace Moth {
 class VME
 {
 public:
-    static QV4::ReturnedValue exec(QV4::ExecutionEngine *, const uchar *);
-
-private:
-    QV4::ReturnedValue run(QV4::ExecutionEngine *, const uchar *code);
+    struct ExecData {
+        QV4::Function *function;
+        const QV4::ExecutionContext *scope;
+    };
+    static inline
+    QV4::ReturnedValue exec(Function *v4Function, const Value *thisObject, const Value *argv, int argc, const ExecutionContext *context) {
+        ExecData data{v4Function, context};
+        quintptr d = reinterpret_cast<quintptr>(&data) | 0x1;
+        return exec(reinterpret_cast<const FunctionObject *>(d), thisObject, argv, argc);
+    }
+    static QV4::ReturnedValue exec(const FunctionObject *fo, const Value *thisObject, const Value *argv, int argc);
 };
 
 } // namespace Moth
diff --git a/src/qml/memory/qv4heap_p.h b/src/qml/memory/qv4heap_p.h
index f00ce4283c..363e891d5c 100644
--- a/src/qml/memory/qv4heap_p.h
+++ b/src/qml/memory/qv4heap_p.h
@@ -75,7 +75,6 @@ struct InternalClass;
 struct VTable
 {
     const VTable * const parent;
-    const quint64 markTable;
     uint inlinePropertyOffset : 16;
     uint nInlineProperties : 16;
     uint isExecutionContext : 1;
@@ -97,7 +96,7 @@ namespace Heap {
 struct Q_QML_EXPORT Base {
     void *operator new(size_t) = delete;
 
-    static Q_CONSTEXPR quint64 markTable = 0;
+    static void markObjects(Heap::Base *, MarkStack *) {}
 
     InternalClass *internalClass;
 
@@ -131,7 +130,9 @@ struct Q_QML_EXPORT Base {
         return Chunk::testBit(c->objectBitmap, h - c->realBase());
     }
 
-    inline void markChildren(MarkStack *markStack);
+    inline void markChildren(MarkStack *markStack) {
+        vtable()->markObjects(this, markStack);
+    }
 
     void *operator new(size_t, Managed *m) { return m; }
     void *operator new(size_t, Heap::Base *m) { return m; }
@@ -184,6 +185,22 @@ Q_STATIC_ASSERT(sizeof(Base) == QT_POINTER_SIZE);
 
 }
 
+inline
+void Heap::Base::mark(QV4::MarkStack *markStack)
+{
+    Q_ASSERT(inUse());
+    const HeapItem *h = reinterpret_cast<const HeapItem *>(this);
+    Chunk *c = h->chunk();
+    size_t index = h - c->realBase();
+    Q_ASSERT(!Chunk::testBit(c->extendsBitmap, index));
+    quintptr *bitmap = c->blackBitmap + Chunk::bitmapIndex(index);
+    quintptr bit = Chunk::bitForIndex(index);
+    if (!(*bitmap & bit)) {
+        *bitmap |= bit;
+        markStack->push(this);
+    }
+}
+
 #ifdef QT_NO_QOBJECT
 template <class T>
 struct QQmlQPointer {
diff --git a/src/qml/memory/qv4mm.cpp b/src/qml/memory/qv4mm.cpp
index de97918fb0..3ea7908e9d 100644
--- a/src/qml/memory/qv4mm.cpp
+++ b/src/qml/memory/qv4mm.cpp
@@ -279,64 +279,6 @@ QString binary(quintptr) { return QString(); }
 #define SDUMP if (1) ; else qDebug
 #endif
 
-void Heap::Base::markChildren(MarkStack *markStack)
-{
-    if (vtable()->markObjects)
-        vtable()->markObjects(this, markStack);
-    if (quint64 m = vtable()->markTable) {
-//            qDebug() << "using mark table:" << hex << m << "for" << h;
-        void **mem = reinterpret_cast<void **>(this);
-        while (m) {
-            MarkFlags mark = static_cast<MarkFlags>(m & 3);
-            switch (mark) {
-            case Mark_NoMark:
-                break;
-            case Mark_Value:
-//                    qDebug() << "marking value at " << mem;
-                reinterpret_cast<Value *>(mem)->mark(markStack);
-                break;
-            case Mark_Pointer: {
-//                    qDebug() << "marking pointer at " << mem;
-                Heap::Base *p = *reinterpret_cast<Heap::Base **>(mem);
-                if (p)
-                    p->mark(markStack);
-                break;
-            }
-            case Mark_ValueArray: {
-                Q_ASSERT(m == Mark_ValueArray);
-//                    qDebug() << "marking Value Array at offset" << hex << (mem - reinterpret_cast<void **>(h));
-                ValueArray<0> *a = reinterpret_cast<ValueArray<0> *>(mem);
-                Value *v = a->values;
-                const Value *end = v + a->alloc;
-                if (a->alloc > 32*1024) {
-                    // drain from time to time to avoid overflows in the js stack
-                    Heap::Base **currentBase = markStack->top;
-                    while (v < end) {
-                        v->mark(markStack);
-                        ++v;
-                        if (markStack->top >= currentBase + 32*1024) {
-                            Heap::Base **oldBase = markStack->base;
-                            markStack->base = currentBase;
-                            markStack->drain();
-                            markStack->base = oldBase;
-                        }
-                    }
-                } else {
-                    while (v < end) {
-                        v->mark(markStack);
-                        ++v;
-                    }
-                }
-                break;
-            }
-            }
-
-            m >>= 2;
-            ++mem;
-        }
-    }
-}
-
 // Stores a classname -> freed count mapping.
 typedef QHash<const char*, int> MMStatsHash;
 Q_GLOBAL_STATIC(MMStatsHash, freedObjectStatsGlobal)
@@ -553,51 +495,6 @@ void Chunk::sortIntoBins(HeapItem **bins, uint nBins)
 #endif
 }
 
-
-template<typename T>
-StackAllocator<T>::StackAllocator(ChunkAllocator *chunkAlloc)
-    : chunkAllocator(chunkAlloc)
-{
-    chunks.push_back(chunkAllocator->allocate());
-    firstInChunk = chunks.back()->first();
-    nextFree = firstInChunk;
-    lastInChunk = firstInChunk + (Chunk::AvailableSlots - 1)/requiredSlots*requiredSlots;
-}
-
-template<typename T>
-void StackAllocator<T>::freeAll()
-{
-    for (auto c : chunks)
-        chunkAllocator->free(c);
-}
-
-template<typename T>
-void StackAllocator<T>::nextChunk() {
-    Q_ASSERT(nextFree == lastInChunk);
-    ++currentChunk;
-    if (currentChunk >= chunks.size()) {
-        Chunk *newChunk = chunkAllocator->allocate();
-        chunks.push_back(newChunk);
-    }
-    firstInChunk = chunks.at(currentChunk)->first();
-    nextFree = firstInChunk;
-    lastInChunk = firstInChunk + (Chunk::AvailableSlots - 1)/requiredSlots*requiredSlots;
-}
-
-template<typename T>
-void QV4::StackAllocator<T>::prevChunk() {
-    Q_ASSERT(nextFree == firstInChunk);
-    Q_ASSERT(chunks.at(currentChunk) == nextFree->chunk());
-    Q_ASSERT(currentChunk > 0);
-    --currentChunk;
-    firstInChunk = chunks.at(currentChunk)->first();
-    lastInChunk = firstInChunk + (Chunk::AvailableSlots - 1)/requiredSlots*requiredSlots;
-    nextFree = lastInChunk;
-}
-
-template struct StackAllocator<Heap::CallContext>;
-
-
 HeapItem *BlockAllocator::allocate(size_t size, bool forceAllocation) {
     Q_ASSERT((size % Chunk::SlotSize) == 0);
     size_t slotsRequired = size >> Chunk::SlotSizeShift;
@@ -836,7 +733,6 @@ void HugeItemAllocator::freeAll()
 MemoryManager::MemoryManager(ExecutionEngine *engine)
     : engine(engine)
     , chunkAllocator(new ChunkAllocator)
-    , stackAllocator(chunkAllocator)
     , blockAllocator(chunkAllocator)
     , hugeItemAllocator(chunkAllocator)
     , m_persistentValues(new PersistentValueStorage(engine))
@@ -1261,7 +1157,6 @@ MemoryManager::~MemoryManager()
     sweep(/*lastSweep*/true);
     blockAllocator.freeAll();
     hugeItemAllocator.freeAll();
-    stackAllocator.freeAll();
 
     delete m_weakValues;
 #ifdef V4_USE_VALGRIND
@@ -1303,9 +1198,11 @@ void MemoryManager::collectFromJSStack(MarkStack *markStack) const
     Value *top = engine->jsStackTop;
     while (v < top) {
         Managed *m = v->managed();
-        if (m && m->inUse())
+        if (m) {
+            Q_ASSERT(m->inUse());
             // Skip pointers to already freed objects, they are bogus as well
             m->mark(markStack);
+        }
         ++v;
     }
 }
diff --git a/src/qml/memory/qv4mm_p.h b/src/qml/memory/qv4mm_p.h
index 17957d0cd6..921fea3956 100644
--- a/src/qml/memory/qv4mm_p.h
+++ b/src/qml/memory/qv4mm_p.h
@@ -72,51 +72,6 @@ namespace QV4 {
 
 struct ChunkAllocator;
 
-template<typename T>
-struct StackAllocator {
-    Q_STATIC_ASSERT(sizeof(T) < Chunk::DataSize);
-    static const uint requiredSlots = (sizeof(T) + sizeof(HeapItem) - 1)/sizeof(HeapItem);
-
-    StackAllocator(ChunkAllocator *chunkAlloc);
-
-    T *allocate() {
-        HeapItem *m = nextFree;
-        if (Q_UNLIKELY(nextFree == lastInChunk)) {
-            nextChunk();
-        } else {
-            nextFree += requiredSlots;
-        }
-#if MM_DEBUG || !defined(QT_NO_DEBUG) || defined(QT_FORCE_ASSERTS)
-        Chunk *c = m->chunk();
-        Chunk::setBit(c->objectBitmap, m - c->realBase());
-#endif
-        return m->as<T>();
-    }
-    void free() {
-        if (Q_UNLIKELY(nextFree == firstInChunk)) {
-            prevChunk();
-        } else {
-            nextFree -= requiredSlots;
-        }
-#if MM_DEBUG || !defined(QT_NO_DEBUG) || defined(QT_FORCE_ASSERTS)
-        Chunk *c = nextFree->chunk();
-        Chunk::clearBit(c->objectBitmap, nextFree - c->realBase());
-#endif
-    }
-
-    void nextChunk();
-    void prevChunk();
-
-    void freeAll();
-
-    ChunkAllocator *chunkAllocator;
-    HeapItem *nextFree = 0;
-    HeapItem *firstInChunk = 0;
-    HeapItem *lastInChunk = 0;
-    std::vector<Chunk *> chunks;
-    uint currentChunk = 0;
-};
-
 struct BlockAllocator {
     BlockAllocator(ChunkAllocator *chunkAllocator)
         : chunkAllocator(chunkAllocator)
@@ -211,19 +166,6 @@ public:
     Q_DECL_CONSTEXPR static inline std::size_t align(std::size_t size)
     { return (size + Chunk::SlotSize - 1) & ~(Chunk::SlotSize - 1); }
 
-    QV4::Heap::CallContext *allocSimpleCallContext()
-    {
-        Heap::CallContext *ctxt = stackAllocator.allocate();
-        memset(ctxt, 0, sizeof(Heap::SimpleCallContext));
-        ctxt->internalClass = SimpleCallContext::defaultInternalClass(engine);
-        Q_ASSERT(ctxt->internalClass && ctxt->internalClass->vtable);
-        ctxt->init();
-        return ctxt;
-
-    }
-    void freeSimpleCallContext()
-    { stackAllocator.free(); }
-
     template<typename ManagedType>
     inline typename ManagedType::Data *allocManaged(std::size_t size)
     {
@@ -237,6 +179,18 @@ public:
         return static_cast<typename ManagedType::Data *>(o);
     }
 
+    template<typename ManagedType>
+    inline typename ManagedType::Data *allocManaged(std::size_t size, InternalClass *ic)
+    {
+        V4_ASSERT_IS_TRIVIAL(typename ManagedType::Data)
+        size = align(size);
+        Heap::Base *o = allocData(size);
+        o->internalClass = ic;
+        Q_ASSERT(o->internalClass && o->internalClass->vtable);
+        Q_ASSERT(ic->vtable == ManagedType::staticVTable());
+        return static_cast<typename ManagedType::Data *>(o);
+    }
+
     template <typename ObjectType>
     typename ObjectType::Data *allocateObject(InternalClass *ic)
     {
@@ -465,7 +419,6 @@ private:
 public:
     QV4::ExecutionEngine *engine;
     ChunkAllocator *chunkAllocator;
-    StackAllocator<Heap::CallContext> stackAllocator;
     BlockAllocator blockAllocator;
     HugeItemAllocator hugeItemAllocator;
     PersistentValueStorage *m_persistentValues;
diff --git a/src/qml/memory/qv4mmdefs_p.h b/src/qml/memory/qv4mmdefs_p.h
index 328797fb5e..6d911e69f6 100644
--- a/src/qml/memory/qv4mmdefs_p.h
+++ b/src/qml/memory/qv4mmdefs_p.h
@@ -287,32 +287,8 @@ struct MarkStack {
 
 };
 
-// Some helper classes and macros to automate the generation of our
-// tables used for marking objects
-
-enum MarkFlags {
-    Mark_NoMark = 0,
-    Mark_Value = 1,
-    Mark_Pointer = 2,
-    Mark_ValueArray = 3
-};
-
-template <typename T>
-struct MarkFlagEvaluator {
-    static Q_CONSTEXPR quint64 value = 0;
-};
-template <typename T, size_t o>
-struct MarkFlagEvaluator<Heap::Pointer<T, o>> {
-    static Q_CONSTEXPR quint64 value = static_cast<quint64>(Mark_Pointer) << (2*o / sizeof(quintptr));
-};
-template <size_t o>
-struct MarkFlagEvaluator<ValueArray<o>> {
-    static Q_CONSTEXPR quint64 value = static_cast<quint64>(Mark_ValueArray) << (2*o / sizeof(quintptr));
-};
-template <size_t o>
-struct MarkFlagEvaluator<HeapValue<o>> {
-    static Q_CONSTEXPR quint64 value = static_cast<quint64>(Mark_Value) << (2 *o / sizeof(quintptr));
-};
+// Some helper to automate the generation of our
+// functions used for marking objects
 
 #define HEAP_OBJECT_OFFSET_MEMBER_EXPANSION(c, gcType, type, name) \
     HEAP_OBJECT_OFFSET_MEMBER_EXPANSION_##gcType(c, type, name)
@@ -334,25 +310,42 @@ struct MarkFlagEvaluator<HeapValue<o>> {
 #define HEAP_OBJECT_MEMBER_EXPANSION_ValueArray(c, type, name) \
     type<offsetof(c##OffsetStruct, name) + baseOffset> name;
 
-#define HEAP_OBJECT_MARK_EXPANSION(class, gcType, type, name) \
-    MarkFlagEvaluator<decltype(class::name)>::value |
+#define HEAP_OBJECT_MARKOBJECTS_EXPANSION(c, gcType, type, name) \
+    HEAP_OBJECT_MARKOBJECTS_EXPANSION_##gcType(c, type, name)
+#define HEAP_OBJECT_MARKOBJECTS_EXPANSION_Pointer(c, type, name) \
+    if (o->name) o->name.heapObject()->mark(stack);
+#define HEAP_OBJECT_MARKOBJECTS_EXPANSION_NoMark(c, type, name)
+#define HEAP_OBJECT_MARKOBJECTS_EXPANSION_HeapValue(c, type, name) \
+    o->name.mark(stack);
+#define HEAP_OBJECT_MARKOBJECTS_EXPANSION_ValueArray(c, type, name) \
+    o->name.mark(stack);
 
-#define DECLARE_HEAP_OBJECT(name, base) \
+
+#define DECLARE_HEAP_OBJECT_BASE(name, base) \
 struct name##OffsetStruct { \
     name##Members(name, HEAP_OBJECT_OFFSET_MEMBER_EXPANSION) \
 }; \
 struct name##SizeStruct : base, name##OffsetStruct {}; \
 struct name##Data { \
+    typedef base SuperClass; \
     static Q_CONSTEXPR size_t baseOffset = sizeof(name##SizeStruct) - sizeof(name##OffsetStruct); \
     name##Members(name, HEAP_OBJECT_MEMBER_EXPANSION) \
 }; \
 Q_STATIC_ASSERT(sizeof(name##SizeStruct) == sizeof(name##Data) + name##Data::baseOffset); \
-static Q_CONSTEXPR quint64 name##_markTable = \
-    (name##Members(name##Data, HEAP_OBJECT_MARK_EXPANSION) 0) | QV4::Heap::base::markTable; \
-    \
-struct name : base, name##Data
 
-#define DECLARE_MARK_TABLE(class) static Q_CONSTEXPR quint64 markTable = class##_markTable
+#define DECLARE_HEAP_OBJECT(name, base) \
+DECLARE_HEAP_OBJECT_BASE(name, base) \
+struct name : base, name##Data
+#define DECLARE_EXPORTED_HEAP_OBJECT(name, base) \
+DECLARE_HEAP_OBJECT_BASE(name, base) \
+struct Q_QML_EXPORT name : base, name##Data
+
+#define DECLARE_MARKOBJECTS(class) \
+    static void markObjects(Heap::Base *b, MarkStack *stack) { \
+        class *o = static_cast<class *>(b); \
+        class##Data::SuperClass::markObjects(o, stack); \
+        class##Members(class, HEAP_OBJECT_MARKOBJECTS_EXPANSION) \
+    }
 
 }
 
diff --git a/src/qml/memory/qv4writebarrier_p.h b/src/qml/memory/qv4writebarrier_p.h
index 86fd28000d..4ec224cc36 100644
--- a/src/qml/memory/qv4writebarrier_p.h
+++ b/src/qml/memory/qv4writebarrier_p.h
@@ -114,8 +114,8 @@ namespace Heap {
 template <typename T, size_t o>
 struct Pointer {
     static Q_CONSTEXPR size_t offset = o;
-    T operator->() const { return ptr; }
-    operator T () const { return ptr; }
+    T operator->() const { return get(); }
+    operator T () const { return get(); }
 
     Heap::Base *base() {
         Heap::Base *base = reinterpret_cast<Heap::Base *>(this) - (offset/sizeof(Heap::Base));
@@ -124,14 +124,18 @@ struct Pointer {
     }
 
     void set(EngineBase *e, T newVal) {
-        WriteBarrier::write(e, base(), reinterpret_cast<Heap::Base **>(&ptr), reinterpret_cast<Heap::Base *>(newVal));
+        WriteBarrier::write(e, base(), &ptr, reinterpret_cast<Heap::Base *>(newVal));
     }
 
+    T get() const { return reinterpret_cast<T>(ptr); }
+
     template <typename Type>
     Type *cast() { return static_cast<Type *>(ptr); }
 
+    Heap::Base *heapObject() const { return ptr; }
+
 private:
-    T ptr;
+    Heap::Base *ptr;
 };
 typedef Pointer<char *, 0> V4PointerCheck;
 V4_ASSERT_IS_TRIVIAL(V4PointerCheck)
@@ -192,6 +196,30 @@ struct ValueArray {
             values[i] = values[i + n];
         }
     }
+
+    void mark(MarkStack *markStack) {
+        Value *v = values;
+        const Value *end = v + alloc;
+        if (alloc > 32*1024) {
+            // drain from time to time to avoid overflows in the js stack
+            Heap::Base **currentBase = markStack->top;
+            while (v < end) {
+                v->mark(markStack);
+                ++v;
+                if (markStack->top >= currentBase + 32*1024) {
+                    Heap::Base **oldBase = markStack->base;
+                    markStack->base = currentBase;
+                    markStack->drain();
+                    markStack->base = oldBase;
+                }
+            }
+        } else {
+            while (v < end) {
+                v->mark(markStack);
+                ++v;
+            }
+        }
+    }
 };
 
 // It's really important that the offset of values in this structure is
diff --git a/src/qml/parser/qqmljsast_p.h b/src/qml/parser/qqmljsast_p.h
index aa48accfe0..7291cf0d3d 100644
--- a/src/qml/parser/qqmljsast_p.h
+++ b/src/qml/parser/qqmljsast_p.h
@@ -100,7 +100,8 @@ enum Op {
     Sub,
     URShift,
     InplaceURightShift,
-    InplaceXor
+    InplaceXor,
+    Invalid
 };
 
 } // namespace QSOperator
diff --git a/src/qml/qml.pro b/src/qml/qml.pro
index e9d7dcbd2d..c13227d8fe 100644
--- a/src/qml/qml.pro
+++ b/src/qml/qml.pro
@@ -57,14 +57,16 @@ include(memory/memory.pri)
 include(parser/parser.pri)
 include(compiler/compiler.pri)
 include(jsapi/jsapi.pri)
-include(jit/jit.pri)
 include(jsruntime/jsruntime.pri)
+include(jit/jit.pri)
 include(qml/qml.pri)
 include(debugger/debugger.pri)
 qtConfig(animation) {
     include(animations/animations.pri)
 }
 include(types/types.pri)
+include(../3rdparty/masm/masm-defs.pri)
+include(../3rdparty/masm/masm.pri)
 
 MODULE_PLUGIN_TYPES = \
     qmltooling
diff --git a/src/qml/qml/qqmlbinding.cpp b/src/qml/qml/qqmlbinding.cpp
index 43ab74138c..56ab259229 100644
--- a/src/qml/qml/qqmlbinding.cpp
+++ b/src/qml/qml/qqmlbinding.cpp
@@ -203,12 +203,11 @@ protected:
 
         bool isUndefined = false;
 
-        QV4::ScopedCallData callData(scope);
-        QQmlJavaScriptExpression::evaluate(callData, &isUndefined, scope);
+        QV4::ScopedValue result(scope, QQmlJavaScriptExpression::evaluate(&isUndefined));
 
         bool error = false;
         if (!watcher.wasDeleted() && isAddedToObject() && !hasError())
-            error = !write(scope.result, isUndefined, flags);
+            error = !write(result, isUndefined, flags);
 
         if (!watcher.wasDeleted()) {
 
@@ -457,12 +456,11 @@ QVariant QQmlBinding::evaluate()
     bool isUndefined = false;
 
     QV4::Scope scope(ep->v4engine());
-    QV4::ScopedCallData callData(scope);
-    QQmlJavaScriptExpression::evaluate(callData, &isUndefined, scope);
+    QV4::ScopedValue result(scope, QQmlJavaScriptExpression::evaluate(&isUndefined));
 
     ep->dereferenceScarceResources();
 
-    return scope.engine->toVariant(scope.result, qMetaTypeId<QList<QObject*> >());
+    return scope.engine->toVariant(result, qMetaTypeId<QList<QObject*> >());
 }
 
 QString QQmlBinding::expressionIdentifier() const
diff --git a/src/qml/qml/qqmlboundsignal.cpp b/src/qml/qml/qqmlboundsignal.cpp
index 19ece44beb..1d7a37fc99 100644
--- a/src/qml/qml/qqmlboundsignal.cpp
+++ b/src/qml/qml/qqmlboundsignal.cpp
@@ -55,6 +55,7 @@
 
 #include <private/qjsvalue_p.h>
 #include <private/qv4value_p.h>
+#include <private/qv4jscall_p.h>
 #include <private/qv4qobjectwrapper_p.h>
 
 #include <QtCore/qdebug.h>
@@ -192,35 +193,35 @@ void QQmlBoundSignalExpression::evaluate(void **a)
     int *argsTypes = QQmlMetaObject(m_target).methodParameterTypes(methodIndex, &storage, 0);
     int argCount = argsTypes ? *argsTypes : 0;
 
-    QV4::ScopedCallData callData(scope, argCount);
+    QV4::JSCallData jsCall(scope, argCount);
     for (int ii = 0; ii < argCount; ++ii) {
         int type = argsTypes[ii + 1];
         //### ideally we would use metaTypeToJS, however it currently gives different results
         //    for several cases (such as QVariant type and QObject-derived types)
         //args[ii] = engine->metaTypeToJS(type, a[ii + 1]);
         if (type == qMetaTypeId<QJSValue>()) {
-            if (QV4::Value *v4Value = QJSValuePrivate::valueForData(reinterpret_cast<QJSValue *>(a[ii + 1]), &callData->args[ii]))
-                callData->args[ii] = *v4Value;
+            if (QV4::Value *v4Value = QJSValuePrivate::valueForData(reinterpret_cast<QJSValue *>(a[ii + 1]), &jsCall->args[ii]))
+                jsCall->args[ii] = *v4Value;
             else
-                callData->args[ii] = QV4::Encode::undefined();
+                jsCall->args[ii] = QV4::Encode::undefined();
         } else if (type == QMetaType::QVariant) {
-            callData->args[ii] = scope.engine->fromVariant(*((QVariant *)a[ii + 1]));
+            jsCall->args[ii] = scope.engine->fromVariant(*((QVariant *)a[ii + 1]));
         } else if (type == QMetaType::Int) {
             //### optimization. Can go away if we switch to metaTypeToJS, or be expanded otherwise
-            callData->args[ii] = QV4::Primitive::fromInt32(*reinterpret_cast<const int*>(a[ii + 1]));
+            jsCall->args[ii] = QV4::Primitive::fromInt32(*reinterpret_cast<const int*>(a[ii + 1]));
         } else if (type == qMetaTypeId<QQmlV4Handle>()) {
-            callData->args[ii] = *reinterpret_cast<QQmlV4Handle *>(a[ii + 1]);
+            jsCall->args[ii] = *reinterpret_cast<QQmlV4Handle *>(a[ii + 1]);
         } else if (ep->isQObject(type)) {
             if (!*reinterpret_cast<void* const *>(a[ii + 1]))
-                callData->args[ii] = QV4::Primitive::nullValue();
+                jsCall->args[ii] = QV4::Primitive::nullValue();
             else
-                callData->args[ii] = QV4::QObjectWrapper::wrap(ep->v4engine(), *reinterpret_cast<QObject* const *>(a[ii + 1]));
+                jsCall->args[ii] = QV4::QObjectWrapper::wrap(ep->v4engine(), *reinterpret_cast<QObject* const *>(a[ii + 1]));
         } else {
-            callData->args[ii] = scope.engine->fromVariant(QVariant(type, a[ii + 1]));
+            jsCall->args[ii] = scope.engine->fromVariant(QVariant(type, a[ii + 1]));
         }
     }
 
-    QQmlJavaScriptExpression::evaluate(callData, 0, scope);
+    QQmlJavaScriptExpression::evaluate(jsCall.callData(), 0);
 
     ep->dereferenceScarceResources(); // "release" scarce resources if top-level expression evaluation is complete.
 }
@@ -237,12 +238,12 @@ void QQmlBoundSignalExpression::evaluate(const QList<QVariant> &args)
 
     ep->referenceScarceResources(); // "hold" scarce resources in memory during evaluation.
 
-    QV4::ScopedCallData callData(scope, args.count());
+    QV4::JSCallData jsCall(scope, args.count());
     for (int ii = 0; ii < args.count(); ++ii) {
-        callData->args[ii] = scope.engine->fromVariant(args[ii]);
+        jsCall->args[ii] = scope.engine->fromVariant(args[ii]);
     }
 
-    QQmlJavaScriptExpression::evaluate(callData, 0, scope);
+    QQmlJavaScriptExpression::evaluate(jsCall.callData(), 0);
 
     ep->dereferenceScarceResources(); // "release" scarce resources if top-level expression evaluation is complete.
 }
diff --git a/src/qml/qml/qqmlcomponent.cpp b/src/qml/qml/qqmlcomponent.cpp
index 8ec8669c60..5a03f2dd93 100644
--- a/src/qml/qml/qqmlcomponent.cpp
+++ b/src/qml/qml/qqmlcomponent.cpp
@@ -58,6 +58,7 @@
 #include <private/qv4scopedvalue_p.h>
 #include <private/qv4objectiterator_p.h>
 #include <private/qv4qobjectwrapper_p.h>
+#include <private/qv4jscall_p.h>
 
 #include <QDir>
 #include <QStack>
@@ -1097,7 +1098,7 @@ namespace Heap {
     Member(class, NoMark, QQmlQPointer<QObject>, parent)
 
 DECLARE_HEAP_OBJECT(QmlIncubatorObject, Object) {
-    DECLARE_MARK_TABLE(QmlIncubatorObject);
+    DECLARE_MARKOBJECTS(QmlIncubatorObject);
 
     void init(QQmlIncubator::IncubationMode = QQmlIncubator::Asynchronous);
     inline void destroy();
@@ -1110,11 +1111,11 @@ struct QmlIncubatorObject : public QV4::Object
     V4_OBJECT2(QmlIncubatorObject, Object)
     V4_NEEDS_DESTROY
 
-    static void method_get_statusChanged(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_set_statusChanged(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_status(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_object(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_forceCompletion(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_get_statusChanged(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_set_statusChanged(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_get_status(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_get_object(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_forceCompletion(const BuiltinFunction *, CallData *callData);
 
     void statusChanged(QQmlIncubator::Status);
     void setInitialState(QObject *);
@@ -1224,8 +1225,7 @@ void QQmlComponentPrivate::setInitialProperties(QV4::ExecutionEngine *engine, QV
     if (engine->hasException)
         return;
 
-    QV4::ExecutionContextSaver saver(scope);
-    engine->pushContext(qmlContext);
+    QV4::ScopedStackFrame frame(scope, qmlContext->d());
 
     while (1) {
         name = it.nextPropertyNameAsString(val);
@@ -1460,17 +1460,19 @@ QQmlComponentExtension::QQmlComponentExtension(QV4::ExecutionEngine *v4)
     incubationProto.set(v4, proto);
 }
 
-void QV4::QmlIncubatorObject::method_get_object(const BuiltinFunction *, Scope &scope, CallData *callData)
+QV4::ReturnedValue QV4::QmlIncubatorObject::method_get_object(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QV4::Scoped<QmlIncubatorObject> o(scope, callData->thisObject.as<QmlIncubatorObject>());
     if (!o)
         THROW_TYPE_ERROR();
 
-    scope.result = QV4::QObjectWrapper::wrap(scope.engine, o->d()->incubator->object());
+    return QV4::QObjectWrapper::wrap(scope.engine, o->d()->incubator->object());
 }
 
-void QV4::QmlIncubatorObject::method_forceCompletion(const BuiltinFunction *, Scope &scope, CallData *callData)
+QV4::ReturnedValue QV4::QmlIncubatorObject::method_forceCompletion(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QV4::Scoped<QmlIncubatorObject> o(scope, callData->thisObject.as<QmlIncubatorObject>());
     if (!o)
         THROW_TYPE_ERROR();
@@ -1480,28 +1482,31 @@ void QV4::QmlIncubatorObject::method_forceCompletion(const BuiltinFunction *, Sc
     RETURN_UNDEFINED();
 }
 
-void QV4::QmlIncubatorObject::method_get_status(const BuiltinFunction *, Scope &scope, CallData *callData)
+QV4::ReturnedValue QV4::QmlIncubatorObject::method_get_status(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QV4::Scoped<QmlIncubatorObject> o(scope, callData->thisObject.as<QmlIncubatorObject>());
     if (!o)
         THROW_TYPE_ERROR();
 
-    scope.result = QV4::Encode(o->d()->incubator->status());
+    return QV4::Encode(o->d()->incubator->status());
 }
 
-void QV4::QmlIncubatorObject::method_get_statusChanged(const BuiltinFunction *, Scope &scope, CallData *callData)
+QV4::ReturnedValue QV4::QmlIncubatorObject::method_get_statusChanged(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QV4::Scoped<QmlIncubatorObject> o(scope, callData->thisObject.as<QmlIncubatorObject>());
     if (!o)
         THROW_TYPE_ERROR();
 
-    scope.result = o->d()->statusChanged;
+    return QV4::Encode(o->d()->statusChanged);
 }
 
-void QV4::QmlIncubatorObject::method_set_statusChanged(const BuiltinFunction *, Scope &scope, CallData *callData)
+QV4::ReturnedValue QV4::QmlIncubatorObject::method_set_statusChanged(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QV4::Scoped<QmlIncubatorObject> o(scope, callData->thisObject.as<QmlIncubatorObject>());
-    if (!o || callData->argc < 1)
+    if (!o || callData->argc() < 1)
         THROW_TYPE_ERROR();
 
     o->d()->statusChanged.set(scope.engine, callData->args[0]);
@@ -1556,10 +1561,10 @@ void QV4::QmlIncubatorObject::statusChanged(QQmlIncubator::Status s)
 
     QV4::ScopedFunctionObject f(scope, d()->statusChanged);
     if (f) {
-        QV4::ScopedCallData callData(scope, 1);
-        callData->thisObject = this;
-        callData->args[0] = QV4::Primitive::fromUInt32(s);
-        f->call(scope, callData);
+        QV4::JSCallData jsCallData(scope, 1);
+        *jsCallData->thisObject = this;
+        jsCallData->args[0] = QV4::Primitive::fromUInt32(s);
+        f->call(jsCallData);
         if (scope.hasException()) {
             QQmlError error = scope.engine->catchExceptionAsQmlError();
             QQmlEnginePrivate::warning(QQmlEnginePrivate::get(scope.engine->qmlEngine()), error);
diff --git a/src/qml/qml/qqmldelayedcallqueue.cpp b/src/qml/qml/qqmldelayedcallqueue.cpp
index 13e62ec696..df4030e522 100644
--- a/src/qml/qml/qqmldelayedcallqueue.cpp
+++ b/src/qml/qml/qqmldelayedcallqueue.cpp
@@ -42,6 +42,7 @@
 #include <private/qqmlengine_p.h>
 #include <private/qqmljavascriptexpression_p.h>
 #include <private/qv4value_p.h>
+#include <private/qv4jscall_p.h>
 #include <private/qv4qobjectwrapper_p.h>
 
 #include <QQmlError>
@@ -63,17 +64,17 @@ void QQmlDelayedCallQueue::DelayedFunctionCall::execute(QV4::ExecutionEngine *en
         QV4::Scope scope(engine);
 
         QV4::ArrayObject *array = m_args.as<QV4::ArrayObject>();
+        const QV4::FunctionObject *callback = m_function.as<QV4::FunctionObject>();
+        Q_ASSERT(callback);
         const int argCount = array ? array->getLength() : 0;
-        QV4::ScopedCallData callData(scope, argCount);
-        callData->thisObject = QV4::Encode::undefined();
+        QV4::JSCallData jsCallData(scope, argCount);
+        *jsCallData->thisObject = QV4::Encode::undefined();
 
         for (int i = 0; i < argCount; i++) {
-            callData->args[i] = array->getIndexed(i);
+            jsCallData->args[i] = array->getIndexed(i);
         }
 
-        const QV4::FunctionObject *callback = m_function.as<QV4::FunctionObject>();
-        Q_ASSERT(callback);
-        callback->call(scope, callData);
+        callback->call(jsCallData);
 
         if (scope.engine->hasException) {
             QQmlError error = scope.engine->catchExceptionAsQmlError();
@@ -105,9 +106,10 @@ void QQmlDelayedCallQueue::init(QV4::ExecutionEngine* engine)
     m_tickedMethod = metaObject.method(methodIndex);
 }
 
-void QQmlDelayedCallQueue::addUniquelyAndExecuteLater(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+QV4::ReturnedValue QQmlDelayedCallQueue::addUniquelyAndExecuteLater(const QV4::BuiltinFunction *b, QV4::CallData *callData)
 {
-    if (callData->argc == 0)
+    QV4::Scope scope(b);
+    if (callData->argc() == 0)
         THROW_GENERIC_ERROR("Qt.callLater: no arguments given");
 
     const QV4::FunctionObject *func = callData->args[0].as<QV4::FunctionObject>();
@@ -158,8 +160,8 @@ void QQmlDelayedCallQueue::addUniquelyAndExecuteLater(const QV4::BuiltinFunction
             dfc.m_guarded = true;
         } else if (func->scope()->type == QV4::Heap::ExecutionContext::Type_QmlContext) {
             QV4::QmlContext::Data *g = static_cast<QV4::QmlContext::Data *>(func->scope());
-            Q_ASSERT(g->qml->scopeObject);
-            dfc.m_objectGuard = QQmlGuard<QObject>(g->qml->scopeObject);
+            Q_ASSERT(g->qml()->scopeObject);
+            dfc.m_objectGuard = QQmlGuard<QObject>(g->qml()->scopeObject);
             dfc.m_guarded = true;
         }
     }
@@ -169,22 +171,21 @@ void QQmlDelayedCallQueue::addUniquelyAndExecuteLater(const QV4::BuiltinFunction
         m_tickedMethod.invoke(this, Qt::QueuedConnection);
         m_callbackOutstanding = true;
     }
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
 void QQmlDelayedCallQueue::storeAnyArguments(DelayedFunctionCall &dfc, const QV4::CallData *callData, int offset, QV4::ExecutionEngine *engine)
 {
-    const int length = callData->argc - offset;
+    const int length = callData->argc() - offset;
     if (length == 0) {
         dfc.m_args.clear();
         return;
     }
     QV4::Scope scope(engine);
     QV4::ScopedArrayObject array(scope, engine->newArrayObject(length));
-    int i = 0;
-    for (int j = offset; j < callData->argc; ++i, ++j) {
+    uint i = 0;
+    for (int j = offset, ej = callData->argc(); j < ej; ++i, ++j)
         array->putIndexed(i, callData->args[j]);
-    }
     dfc.m_args.set(engine, array);
 }
 
diff --git a/src/qml/qml/qqmldelayedcallqueue_p.h b/src/qml/qml/qqmldelayedcallqueue_p.h
index cffde4f0c0..5b3043cfed 100644
--- a/src/qml/qml/qqmldelayedcallqueue_p.h
+++ b/src/qml/qml/qqmldelayedcallqueue_p.h
@@ -70,7 +70,7 @@ public:
 
     void init(QV4::ExecutionEngine *);
 
-    void addUniquelyAndExecuteLater(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    QV4::ReturnedValue addUniquelyAndExecuteLater(const QV4::BuiltinFunction *, QV4::CallData *callData);
 
 public Q_SLOTS:
     void ticked();
diff --git a/src/qml/qml/qqmlexpression.cpp b/src/qml/qml/qqmlexpression.cpp
index 1e1fbcf448..35dbaccbbe 100644
--- a/src/qml/qml/qqmlexpression.cpp
+++ b/src/qml/qml/qqmlexpression.cpp
@@ -247,15 +247,14 @@ void QQmlExpression::setExpression(const QString &expression)
 }
 
 // Must be called with a valid handle scope
-void QQmlExpressionPrivate::v4value(bool *isUndefined, QV4::Scope &scope)
+QV4::ReturnedValue QQmlExpressionPrivate::v4value(bool *isUndefined)
 {
     if (!expressionFunctionValid) {
         createQmlBinding(context(), scopeObject(), expression, url, line);
         expressionFunctionValid = true;
     }
 
-    QV4::ScopedCallData callData(scope);
-    evaluate(callData, isUndefined, scope);
+    return evaluate(isUndefined);
 }
 
 QVariant QQmlExpressionPrivate::value(bool *isUndefined)
@@ -274,9 +273,9 @@ QVariant QQmlExpressionPrivate::value(bool *isUndefined)
 
     {
         QV4::Scope scope(QV8Engine::getV4(ep->v8engine()));
-        v4value(isUndefined, scope);
+        QV4::ScopedValue result(scope, v4value(isUndefined));
         if (!hasError())
-            rv = scope.engine->toVariant(scope.result, -1);
+            rv = scope.engine->toVariant(result, -1);
     }
 
     ep->dereferenceScarceResources(); // "release" scarce resources if top-level expression evaluation is complete.
diff --git a/src/qml/qml/qqmlexpression_p.h b/src/qml/qml/qqmlexpression_p.h
index 44342a957b..a94ca0fc2d 100644
--- a/src/qml/qml/qqmlexpression_p.h
+++ b/src/qml/qml/qqmlexpression_p.h
@@ -75,7 +75,7 @@ public:
 
     QVariant value(bool *isUndefined = 0);
 
-    void v4value(bool *isUndefined, QV4::Scope &scope);
+    QV4::ReturnedValue v4value(bool *isUndefined = 0);
 
     static inline QQmlExpressionPrivate *get(QQmlExpression *expr);
     static inline QQmlExpression *get(QQmlExpressionPrivate *expr);
diff --git a/src/qml/qml/qqmljavascriptexpression.cpp b/src/qml/qml/qqmljavascriptexpression.cpp
index 31c277d283..006611e089 100644
--- a/src/qml/qml/qqmljavascriptexpression.cpp
+++ b/src/qml/qml/qqmljavascriptexpression.cpp
@@ -46,6 +46,7 @@
 #include <private/qv4script_p.h>
 #include <private/qv4errorobject_p.h>
 #include <private/qv4scopedvalue_p.h>
+#include <private/qv4jscall_p.h>
 #include <private/qqmlglobal_p.h>
 #include <private/qv4qobjectwrapper_p.h>
 #include <private/qqmlbuiltinfunctions_p.h>
@@ -180,9 +181,16 @@ void QQmlJavaScriptExpression::refresh()
 {
 }
 
+QV4::ReturnedValue QQmlJavaScriptExpression::evaluate(bool *isUndefined)
+{
+    QV4::ExecutionEngine *v4 = QV8Engine::getV4(m_context->engine);
+    QV4::Scope scope(v4);
+    QV4::JSCallData jsCall(scope);
 
+    return evaluate(jsCall.callData(), isUndefined);
+}
 
-void QQmlJavaScriptExpression::evaluate(QV4::CallData *callData, bool *isUndefined, QV4::Scope &scope)
+QV4::ReturnedValue QQmlJavaScriptExpression::evaluate(QV4::CallData *callData, bool *isUndefined)
 {
     Q_ASSERT(m_context && m_context->engine);
 
@@ -190,7 +198,7 @@ void QQmlJavaScriptExpression::evaluate(QV4::CallData *callData, bool *isUndefin
     if (!v4Function) {
         if (isUndefined)
             *isUndefined = true;
-        return;
+        return QV4::Encode::undefined();
     }
 
     QQmlEnginePrivate *ep = QQmlEnginePrivate::get(m_context->engine);
@@ -210,19 +218,20 @@ void QQmlJavaScriptExpression::evaluate(QV4::CallData *callData, bool *isUndefin
         capture.guards.copyAndClearPrepend(activeGuards);
 
     QV4::ExecutionEngine *v4 = QV8Engine::getV4(ep->v8engine());
-    scope.result = QV4::Primitive::undefinedValue();
     callData->thisObject = v4->globalObject;
     if (scopeObject()) {
-        QV4::ScopedValue value(scope, QV4::QObjectWrapper::wrap(v4, scopeObject()));
-        if (value->isObject())
-            callData->thisObject = value;
+         QV4::ReturnedValue scope = QV4::QObjectWrapper::wrap(v4, scopeObject());
+        if (QV4::Value::fromReturnedValue(scope).isObject())
+            callData->thisObject = scope;
     }
 
-    QV4::ExecutionContext *outer = static_cast<QV4::ExecutionContext *>(m_qmlScope.valueRef());
-    if (v4Function->canUseSimpleFunction()) {
-        outer->simpleCall(scope, callData, v4Function);
-    } else {
-        outer->call(scope, callData, v4Function);
+    Q_ASSERT(m_qmlScope.valueRef());
+    QV4::ReturnedValue res = v4Function->call(&callData->thisObject, callData->args, callData->argc(), static_cast<QV4::ExecutionContext *>(m_qmlScope.valueRef()));
+    QV4::Scope scope(v4);
+    QV4::ScopedValue result(scope, res);
+    if (v4Function->hasQmlDependencies) {
+        QV4::Heap::QmlContext *qc = m_qmlScope.as<QV4::QmlContext>()->d();
+        QQmlPropertyCapture::registerQmlDependencies(qc, v4, v4Function->compiledFunction);
     }
 
     if (scope.hasException()) {
@@ -234,7 +243,7 @@ void QQmlJavaScriptExpression::evaluate(QV4::CallData *callData, bool *isUndefin
             *isUndefined = true;
     } else {
         if (isUndefined)
-            *isUndefined = scope.result.isUndefined();
+            *isUndefined = result->isUndefined();
 
         if (!watcher.wasDeleted() && hasDelayedError())
             delayedError()->clearError();
@@ -251,6 +260,8 @@ void QQmlJavaScriptExpression::evaluate(QV4::CallData *callData, bool *isUndefin
         g->Delete();
 
     ep->propertyCapture = lastPropertyCapture;
+
+    return result->asReturnedValue();
 }
 
 void QQmlPropertyCapture::captureProperty(QQmlNotifier *n, Duration duration)
@@ -329,12 +340,11 @@ void QQmlPropertyCapture::captureProperty(QObject *o, int c, int n, Duration dur
     }
 }
 
-void QQmlPropertyCapture::registerQmlDependencies(const QV4::CompiledData::Function *compiledFunction, const QV4::Scope &scope)
+void QQmlPropertyCapture::registerQmlDependencies(QV4::Heap::QmlContext *context, const QV4::ExecutionEngine *engine, const QV4::CompiledData::Function *compiledFunction)
 {
     // Let the caller check and avoid the function call :)
     Q_ASSERT(compiledFunction->hasQmlDependencies());
 
-    QV4::ExecutionEngine *engine = scope.engine;
     QQmlEnginePrivate *ep = QQmlEnginePrivate::get(engine->qmlEngine());
     if (!ep)
         return;
@@ -347,8 +357,8 @@ void QQmlPropertyCapture::registerQmlDependencies(const QV4::CompiledData::Funct
 
     capture->expression->m_permanentDependenciesRegistered = true;
 
-    QV4::Scoped<QV4::QmlContext> context(scope, engine->qmlContext());
-    QQmlContextData *qmlContext = context->qmlContext();
+    QV4::Heap::QQmlContextWrapper *wrapper = context->qml();
+    QQmlContextData *qmlContext = wrapper->context->contextData();
 
     const quint32_le *idObjectDependency = compiledFunction->qmlIdObjectDependencyTable();
     const int idObjectDependencyCount = compiledFunction->nDependingIdObjects;
@@ -368,7 +378,7 @@ void QQmlPropertyCapture::registerQmlDependencies(const QV4::CompiledData::Funct
                                  QQmlPropertyCapture::Permanently);
     }
 
-    QObject *scopeObject = context->qmlScope();
+    QObject *scopeObject = wrapper->scopeObject;
     const quint32_le *scopePropertyDependency = compiledFunction->qmlScopePropertiesDependencyTable();
     const int scopePropertyDependencyCount = compiledFunction->nDependingScopeProperties;
     for (int i = 0; i < scopePropertyDependencyCount; ++i) {
diff --git a/src/qml/qml/qqmljavascriptexpression_p.h b/src/qml/qml/qqmljavascriptexpression_p.h
index e9a9f4feee..1cb6d7bfd1 100644
--- a/src/qml/qml/qqmljavascriptexpression_p.h
+++ b/src/qml/qml/qqmljavascriptexpression_p.h
@@ -103,7 +103,8 @@ public:
     virtual QString expressionIdentifier() const = 0;
     virtual void expressionChanged() = 0;
 
-    void evaluate(QV4::CallData *callData, bool *isUndefined, QV4::Scope &scope);
+    QV4::ReturnedValue evaluate(bool *isUndefined);
+    QV4::ReturnedValue evaluate(QV4::CallData *callData, bool *isUndefined);
 
     inline bool notifyOnValueChanged() const;
 
@@ -204,7 +205,7 @@ public:
         Permanently
     };
 
-    static void registerQmlDependencies(const QV4::CompiledData::Function *compiledFunction, const QV4::Scope &scope);
+    static void registerQmlDependencies(QV4::Heap::QmlContext *context, const QV4::ExecutionEngine *engine, const QV4::CompiledData::Function *compiledFunction);
     void captureProperty(QQmlNotifier *, Duration duration = OnlyOnce);
     void captureProperty(QObject *, int, int, Duration duration = OnlyOnce, bool doNotify = true);
 
diff --git a/src/qml/qml/qqmllistwrapper.cpp b/src/qml/qml/qqmllistwrapper.cpp
index 43677e0d78..b4be83a156 100644
--- a/src/qml/qml/qqmllistwrapper.cpp
+++ b/src/qml/qml/qqmllistwrapper.cpp
@@ -171,8 +171,9 @@ void PropertyListPrototype::init(ExecutionEngine *)
     defineDefaultProperty(QStringLiteral("push"), method_push, 1);
 }
 
-void PropertyListPrototype::method_push(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue PropertyListPrototype::method_push(const BuiltinFunction *b, CallData *callData)
 {
+    Scope scope(b);
     ScopedObject instance(scope, callData->thisObject.toObject(scope.engine));
     if (!instance)
         RETURN_UNDEFINED();
@@ -183,12 +184,13 @@ void PropertyListPrototype::method_push(const BuiltinFunction *, Scope &scope, C
         THROW_GENERIC_ERROR("List doesn't define an Append function");
 
     QV4::ScopedObject so(scope);
-    for (int i = 0; i < callData->argc; ++i)
+    for (int i = 0, ei = callData->argc(); i < ei; ++i)
     {
         so = callData->args[i].toObject(scope.engine);
         if (QV4::QObjectWrapper *wrapper = so->as<QV4::QObjectWrapper>())
             w->d()->property().append(&w->d()->property(), wrapper->object() );
     }
+    return Encode::undefined();
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/qml/qqmllistwrapper_p.h b/src/qml/qml/qqmllistwrapper_p.h
index 84dadba01a..0b53395d2b 100644
--- a/src/qml/qml/qqmllistwrapper_p.h
+++ b/src/qml/qml/qqmllistwrapper_p.h
@@ -103,7 +103,7 @@ struct PropertyListPrototype : Object
 {
     void init(ExecutionEngine *engine);
 
-    static void method_push(const BuiltinFunction *, Scope &, CallData *callData);
+    static ReturnedValue method_push(const BuiltinFunction *, CallData *callData);
 };
 
 }
diff --git a/src/qml/qml/qqmllocale.cpp b/src/qml/qml/qqmllocale.cpp
index 326b36c5cd..3f2a373966 100644
--- a/src/qml/qml/qqmllocale.cpp
+++ b/src/qml/qml/qqmllocale.cpp
@@ -58,8 +58,7 @@ DEFINE_OBJECT_VTABLE(QQmlLocaleData);
 
 #define THROW_ERROR(string) \
     do { \
-        scope.result = scope.engine->throwError(QString::fromUtf8(string)); \
-        return; \
+        return scope.engine->throwError(QString::fromUtf8(string)); \
     } while (false)
 
 
@@ -87,37 +86,32 @@ void QQmlDateExtension::registerExtension(QV4::ExecutionEngine *engine)
     engine->dateCtor()->defineDefaultProperty(QStringLiteral("timeZoneUpdated"), method_timeZoneUpdated);
 }
 
-void QQmlDateExtension::method_toLocaleString(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue QQmlDateExtension::method_toLocaleString(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc > 2) {
-        QV4::DatePrototype::method_toLocaleString(b, scope, callData);
-        return;
-    }
+    Scope scope(b);
+    if (callData->argc() > 2)
+        return QV4::DatePrototype::method_toLocaleString(b, &callData->thisObject, callData->args, callData->argc());
 
     QV4::DateObject *date = callData->thisObject.as<DateObject>();
-    if (!date) {
-        QV4::DatePrototype::method_toLocaleString(b, scope, callData);
-        return;
-    }
+    if (!date)
+        return QV4::DatePrototype::method_toLocaleString(b, &callData->thisObject, callData->args, callData->argc());
 
     QDateTime dt = date->toQDateTime();
 
-    if (callData->argc == 0) {
+    if (callData->argc() == 0) {
         // Use QLocale for standard toLocaleString() function
         QLocale locale;
         RETURN_RESULT(scope.engine->newString(locale.toString(dt)));
     }
 
-    if (!isLocaleObject(callData->args[0])) {
-        QV4::DatePrototype::method_toLocaleString(b, scope, callData); // Use the default Date toLocaleString()
-        return;
-    }
+    if (!isLocaleObject(callData->args[0]))
+        return QV4::DatePrototype::method_toLocaleString(b, &callData->thisObject, callData->args, callData->argc()); // Use the default Date toLocaleString()
 
     GET_LOCALE_DATA_RESOURCE(callData->args[0]);
 
     QLocale::FormatType enumFormat = QLocale::LongFormat;
     QString formattedDt;
-    if (callData->argc == 2) {
+    if (callData->argc() == 2) {
         if (String *s = callData->args[1].stringValue()) {
             QString format = s->toQString();
             formattedDt = r->d()->locale->toString(dt, format);
@@ -132,39 +126,36 @@ void QQmlDateExtension::method_toLocaleString(const BuiltinFunction *b, Scope &s
          formattedDt = r->d()->locale->toString(dt, enumFormat);
     }
 
-    scope.result = scope.engine->newString(formattedDt);
+    RETURN_RESULT(scope.engine->newString(formattedDt));
 }
 
-void QQmlDateExtension::method_toLocaleTimeString(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue QQmlDateExtension::method_toLocaleTimeString(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc > 2) {
-        QV4::DatePrototype::method_toLocaleTimeString(b, scope, callData);
-        return;
-    }
+    Scope scope(b);
+    if (callData->argc() > 2)
+        return QV4::DatePrototype::method_toLocaleTimeString(b, &callData->thisObject, callData->args, callData->argc());
 
     QV4::DateObject *date = callData->thisObject.as<DateObject>();
-    if (!date) {
-        QV4::DatePrototype::method_toLocaleTimeString(b, scope, callData);
-        return;
-    }
+    if (!date)
+        return QV4::DatePrototype::method_toLocaleTimeString(b, &callData->thisObject, callData->args, callData->argc());
 
     QDateTime dt = date->toQDateTime();
     QTime time = dt.time();
 
-    if (callData->argc == 0) {
+    if (callData->argc() == 0) {
         // Use QLocale for standard toLocaleString() function
         QLocale locale;
         RETURN_RESULT(scope.engine->newString(locale.toString(time)));
     }
 
     if (!isLocaleObject(callData->args[0]))
-        return QV4::DatePrototype::method_toLocaleTimeString(b, scope, callData); // Use the default Date toLocaleTimeString()
+        return QV4::DatePrototype::method_toLocaleTimeString(b, &callData->thisObject, callData->args, callData->argc()); // Use the default Date toLocaleTimeString()
 
     GET_LOCALE_DATA_RESOURCE(callData->args[0]);
 
     QLocale::FormatType enumFormat = QLocale::LongFormat;
     QString formattedTime;
-    if (callData->argc == 2) {
+    if (callData->argc() == 2) {
         if (String *s = callData->args[1].stringValue()) {
             QString format = s->toQString();
             formattedTime = r->d()->locale->toString(time, format);
@@ -179,39 +170,36 @@ void QQmlDateExtension::method_toLocaleTimeString(const BuiltinFunction *b, Scop
          formattedTime = r->d()->locale->toString(time, enumFormat);
     }
 
-    scope.result = scope.engine->newString(formattedTime);
+    RETURN_RESULT(scope.engine->newString(formattedTime));
 }
 
-void QQmlDateExtension::method_toLocaleDateString(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue QQmlDateExtension::method_toLocaleDateString(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc > 2) {
-        QV4::DatePrototype::method_toLocaleDateString(b, scope, callData);
-        return;
-    }
+    Scope scope(b);
+    if (callData->argc() > 2)
+        return QV4::DatePrototype::method_toLocaleDateString(b, &callData->thisObject, callData->args, callData->argc());
 
     QV4::DateObject *dateObj = callData->thisObject.as<DateObject>();
-    if (!dateObj) {
-        QV4::DatePrototype::method_toLocaleDateString(b, scope, callData);
-        return;
-    }
+    if (!dateObj)
+        return QV4::DatePrototype::method_toLocaleDateString(b, &callData->thisObject, callData->args, callData->argc());
 
     QDateTime dt = dateObj->toQDateTime();
     QDate date = dt.date();
 
-    if (callData->argc == 0) {
+    if (callData->argc() == 0) {
         // Use QLocale for standard toLocaleString() function
         QLocale locale;
         RETURN_RESULT(scope.engine->newString(locale.toString(date)));
     }
 
     if (!isLocaleObject(callData->args[0]))
-        return QV4::DatePrototype::method_toLocaleDateString(b, scope, callData); // Use the default Date toLocaleDateString()
+        return QV4::DatePrototype::method_toLocaleDateString(b, &callData->thisObject, callData->args, callData->argc()); // Use the default Date toLocaleDateString()
 
     GET_LOCALE_DATA_RESOURCE(callData->args[0]);
 
     QLocale::FormatType enumFormat = QLocale::LongFormat;
     QString formattedDate;
-    if (callData->argc == 2) {
+    if (callData->argc() == 2) {
         if (String *s = callData->args[1].stringValue()) {
             QString format = s->toQString();
             formattedDate = r->d()->locale->toString(date, format);
@@ -226,13 +214,14 @@ void QQmlDateExtension::method_toLocaleDateString(const BuiltinFunction *b, Scop
          formattedDate = r->d()->locale->toString(date, enumFormat);
     }
 
-    scope.result = scope.engine->newString(formattedDate);
+    RETURN_RESULT(scope.engine->newString(formattedDate));
 }
 
-void QQmlDateExtension::method_fromLocaleString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlDateExtension::method_fromLocaleString(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QV4::ExecutionEngine * const engine = scope.engine;
-    if (callData->argc == 1) {
+    if (callData->argc() == 1) {
         if (String *s = callData->args[0].stringValue()) {
             QLocale locale;
             QString dateString = s->toQString();
@@ -241,7 +230,7 @@ void QQmlDateExtension::method_fromLocaleString(const BuiltinFunction *, Scope &
         }
     }
 
-    if (callData->argc < 1 || callData->argc > 3 || !isLocaleObject(callData->args[0]))
+    if (callData->argc() < 1 || callData->argc() > 3 || !isLocaleObject(callData->args[0]))
         THROW_ERROR("Locale: Date.fromLocaleString(): Invalid arguments");
 
     GET_LOCALE_DATA_RESOURCE(callData->args[0]);
@@ -249,7 +238,7 @@ void QQmlDateExtension::method_fromLocaleString(const BuiltinFunction *, Scope &
     QLocale::FormatType enumFormat = QLocale::LongFormat;
     QDateTime dt;
     QString dateString = callData->args[1].toQStringNoThrow();
-    if (callData->argc == 3) {
+    if (callData->argc() == 3) {
         if (String *s = callData->args[2].stringValue()) {
             QString format = s->toQString();
             dt = r->d()->locale->toDateTime(dateString, format);
@@ -264,14 +253,15 @@ void QQmlDateExtension::method_fromLocaleString(const BuiltinFunction *, Scope &
         dt = r->d()->locale->toDateTime(dateString, enumFormat);
     }
 
-    scope.result = engine->newDateObject(dt);
+    RETURN_RESULT(engine->newDateObject(dt));
 }
 
-void QQmlDateExtension::method_fromLocaleTimeString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlDateExtension::method_fromLocaleTimeString(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QV4::ExecutionEngine * const engine = scope.engine;
 
-    if (callData->argc == 1) {
+    if (callData->argc() == 1) {
         if (String *s = callData->args[0].stringValue()) {
             QLocale locale;
             QString timeString = s->toQString();
@@ -282,7 +272,7 @@ void QQmlDateExtension::method_fromLocaleTimeString(const BuiltinFunction *, Sco
         }
     }
 
-    if (callData->argc < 1 || callData->argc > 3 || !isLocaleObject(callData->args[0]))
+    if (callData->argc() < 1 || callData->argc() > 3 || !isLocaleObject(callData->args[0]))
         THROW_ERROR("Locale: Date.fromLocaleTimeString(): Invalid arguments");
 
     GET_LOCALE_DATA_RESOURCE(callData->args[0]);
@@ -290,7 +280,7 @@ void QQmlDateExtension::method_fromLocaleTimeString(const BuiltinFunction *, Sco
     QLocale::FormatType enumFormat = QLocale::LongFormat;
     QTime tm;
     QString dateString = callData->args[1].toQStringNoThrow();
-    if (callData->argc == 3) {
+    if (callData->argc() == 3) {
         if (String *s = callData->args[2].stringValue()) {
             QString format = s->toQString();
             tm = r->d()->locale->toTime(dateString, format);
@@ -314,11 +304,12 @@ void QQmlDateExtension::method_fromLocaleTimeString(const BuiltinFunction *, Sco
     RETURN_RESULT(engine->newDateObject(dt));
 }
 
-void QQmlDateExtension::method_fromLocaleDateString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlDateExtension::method_fromLocaleDateString(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QV4::ExecutionEngine * const engine = scope.engine;
 
-    if (callData->argc == 1) {
+    if (callData->argc() == 1) {
         if (String *s = callData->args[0].stringValue()) {
             QLocale locale;
             QString dateString = s->toQString();
@@ -327,7 +318,7 @@ void QQmlDateExtension::method_fromLocaleDateString(const BuiltinFunction *, Sco
         }
     }
 
-    if (callData->argc < 1 || callData->argc > 3 || !isLocaleObject(callData->args[0]))
+    if (callData->argc() < 1 || callData->argc() > 3 || !isLocaleObject(callData->args[0]))
         THROW_ERROR("Locale: Date.fromLocaleDateString(): Invalid arguments");
 
     GET_LOCALE_DATA_RESOURCE(callData->args[0]);
@@ -335,7 +326,7 @@ void QQmlDateExtension::method_fromLocaleDateString(const BuiltinFunction *, Sco
     QLocale::FormatType enumFormat = QLocale::LongFormat;
     QDate dt;
     QString dateString = callData->args[1].toQStringNoThrow();
-    if (callData->argc == 3) {
+    if (callData->argc() == 3) {
         if (String *s = callData->args[2].stringValue()) {
             QString format = s->toQString();
             dt = r->d()->locale->toDate(dateString, format);
@@ -353,9 +344,10 @@ void QQmlDateExtension::method_fromLocaleDateString(const BuiltinFunction *, Sco
     RETURN_RESULT(engine->newDateObject(QDateTime(dt)));
 }
 
-void QQmlDateExtension::method_timeZoneUpdated(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlDateExtension::method_timeZoneUpdated(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 0)
+    QV4::Scope scope(b);
+    if (callData->argc() != 0)
         THROW_ERROR("Locale: Date.timeZoneUpdated(): Invalid arguments");
 
     QV4::DatePrototype::timezoneUpdated();
@@ -373,28 +365,27 @@ void QQmlNumberExtension::registerExtension(QV4::ExecutionEngine *engine)
     engine->numberCtor()->defineDefaultProperty(QStringLiteral("fromLocaleString"), method_fromLocaleString);
 }
 
-void QQmlNumberExtension::method_toLocaleString(const BuiltinFunction *b, Scope &scope, CallData *callData)
+QV4::ReturnedValue QQmlNumberExtension::method_toLocaleString(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc > 3)
+    QV4::Scope scope(b);
+    if (callData->argc() > 3)
         THROW_ERROR("Locale: Number.toLocaleString(): Invalid arguments");
 
     double number = callData->thisObject.toNumber();
 
-    if (callData->argc == 0) {
+    if (callData->argc() == 0) {
         // Use QLocale for standard toLocaleString() function
         QLocale locale;
         RETURN_RESULT(scope.engine->newString(locale.toString(number)));
     }
 
-    if (!isLocaleObject(callData->args[0])) {
-        QV4::NumberPrototype::method_toLocaleString(b, scope, callData); // Use the default Number toLocaleString()
-        return;
-    }
+    if (!isLocaleObject(callData->args[0]))
+        return QV4::NumberPrototype::method_toLocaleString(b, &callData->thisObject, callData->args, callData->argc()); // Use the default Number toLocaleString()
 
     GET_LOCALE_DATA_RESOURCE(callData->args[0]);
 
     quint16 format = 'f';
-    if (callData->argc > 1) {
+    if (callData->argc() > 1) {
         if (!callData->args[1].isString())
             THROW_ERROR("Locale: Number.toLocaleString(): Invalid arguments");
         QString fs = callData->args[1].toQString();
@@ -402,23 +393,24 @@ void QQmlNumberExtension::method_toLocaleString(const BuiltinFunction *b, Scope
             format = fs.at(0).unicode();
     }
     int prec = 2;
-    if (callData->argc > 2) {
+    if (callData->argc() > 2) {
         if (!callData->args[2].isNumber())
             THROW_ERROR("Locale: Number.toLocaleString(): Invalid arguments");
          prec = callData->args[2].toInt32();
     }
 
-    scope.result = scope.engine->newString(r->d()->locale->toString(number, (char)format, prec));
+    RETURN_RESULT(scope.engine->newString(r->d()->locale->toString(number, (char)format, prec)));
 }
 
-void QQmlNumberExtension::method_toLocaleCurrencyString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlNumberExtension::method_toLocaleCurrencyString(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc > 2)
+    QV4::Scope scope(b);
+    if (callData->argc() > 2)
         THROW_ERROR("Locale: Number.toLocaleCurrencyString(): Invalid arguments");
 
     double number = callData->thisObject.toNumber();
 
-    if (callData->argc == 0) {
+    if (callData->argc() == 0) {
         // Use QLocale for standard toLocaleString() function
         QLocale locale;
         RETURN_RESULT(scope.engine->newString(locale.toString(number)));
@@ -430,7 +422,7 @@ void QQmlNumberExtension::method_toLocaleCurrencyString(const BuiltinFunction *,
     GET_LOCALE_DATA_RESOURCE(callData->args[0]);
 
     QString symbol;
-    if (callData->argc > 1) {
+    if (callData->argc() > 1) {
         if (!callData->args[1].isString())
             THROW_ERROR("Locale: Number.toLocaleString(): Invalid arguments");
         symbol = callData->args[1].toQStringNoThrow();
@@ -439,15 +431,16 @@ void QQmlNumberExtension::method_toLocaleCurrencyString(const BuiltinFunction *,
     RETURN_RESULT(scope.engine->newString(r->d()->locale->toCurrencyString(number, symbol)));
 }
 
-void QQmlNumberExtension::method_fromLocaleString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlNumberExtension::method_fromLocaleString(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc < 1 || callData->argc > 2)
+    QV4::Scope scope(b);
+    if (callData->argc() < 1 || callData->argc() > 2)
         THROW_ERROR("Locale: Number.fromLocaleString(): Invalid arguments");
 
     int numberIdx = 0;
     QLocale locale;
 
-    if (callData->argc == 2) {
+    if (callData->argc() == 2) {
         if (!isLocaleObject(callData->args[0]))
             THROW_ERROR("Locale: Number.fromLocaleString(): Invalid arguments");
 
@@ -467,45 +460,49 @@ void QQmlNumberExtension::method_fromLocaleString(const BuiltinFunction *, Scope
     if (!ok)
         THROW_ERROR("Locale: Number.fromLocaleString(): Invalid format");
 
-    scope.result = QV4::Encode(val);
+    RETURN_RESULT(QV4::Encode(val));
 }
 
 //--------------
 // Locale object
 
-void QQmlLocaleData::method_get_firstDayOfWeek(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlLocaleData::method_get_firstDayOfWeek(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QLocale *locale = getThisLocale(scope, callData);
     if (!locale)
-        return;
+        return Encode::undefined();
     int fdow = int(locale->firstDayOfWeek());
     if (fdow == 7)
         fdow = 0; // Qt::Sunday = 7, but Sunday is 0 in JS Date
-    scope.result = QV4::Encode(fdow);
+    RETURN_RESULT(fdow);
 }
 
-void QQmlLocaleData::method_get_measurementSystem(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlLocaleData::method_get_measurementSystem(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QLocale *locale = getThisLocale(scope, callData);
     if (!locale)
-        return;
-    scope.result = QV4::Encode(locale->measurementSystem());
+        return Encode::undefined();
+    return QV4::Encode(locale->measurementSystem());
 }
 
-void QQmlLocaleData::method_get_textDirection(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlLocaleData::method_get_textDirection(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QLocale *locale = getThisLocale(scope, callData);
     if (!locale)
-        return;
+        return Encode::undefined();
 
-    scope.result = QV4::Encode(locale->textDirection());
+    return QV4::Encode(locale->textDirection());
 }
 
-void QQmlLocaleData::method_get_weekDays(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlLocaleData::method_get_weekDays(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QLocale *locale = getThisLocale(scope, callData);
     if (!locale)
-        return;
+        return Encode::undefined();
 
     QList<Qt::DayOfWeek> days = locale->weekdays();
 
@@ -519,14 +516,15 @@ void QQmlLocaleData::method_get_weekDays(const BuiltinFunction *, Scope &scope,
     }
     result->setArrayLengthUnchecked(days.size());
 
-    scope.result = result.asReturnedValue();
+    return result.asReturnedValue();
 }
 
-void QQmlLocaleData::method_get_uiLanguages(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlLocaleData::method_get_uiLanguages(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QLocale *locale = getThisLocale(scope, callData);
     if (!locale)
-        return;
+        return Encode::undefined();
 
     QStringList langs = locale->uiLanguages();
     QV4::ScopedArrayObject result(scope, scope.engine->newArrayObject());
@@ -537,40 +535,42 @@ void QQmlLocaleData::method_get_uiLanguages(const BuiltinFunction *, Scope &scop
 
     result->setArrayLengthUnchecked(langs.size());
 
-    scope.result = result.asReturnedValue();
+    return result.asReturnedValue();
 }
 
-void QQmlLocaleData::method_currencySymbol(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlLocaleData::method_currencySymbol(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QLocale *locale = getThisLocale(scope, callData);
     if (!locale)
-        return;
+        return Encode::undefined();
 
-    if (callData->argc > 1)
+    if (callData->argc() > 1)
         THROW_ERROR("Locale: currencySymbol(): Invalid arguments");
 
     QLocale::CurrencySymbolFormat format = QLocale::CurrencySymbol;
-    if (callData->argc == 1) {
+    if (callData->argc() == 1) {
         quint32 intFormat = callData->args[0].toNumber();
         format = QLocale::CurrencySymbolFormat(intFormat);
     }
 
-    scope.result = scope.engine->newString(locale->currencySymbol(format));
+    RETURN_RESULT(scope.engine->newString(locale->currencySymbol(format)));
 }
 
 #define LOCALE_FORMAT(FUNC) \
-void QQmlLocaleData::method_ ##FUNC (const BuiltinFunction *, Scope &scope, CallData *callData) { \
+ReturnedValue QQmlLocaleData::method_ ##FUNC (const BuiltinFunction *b, CallData *callData) { \
+    QV4::Scope scope(b); \
     QLocale *locale = getThisLocale(scope, callData); \
     if (!locale) \
-        return; \
-    if (callData->argc > 1) \
+        return Encode::undefined(); \
+    if (callData->argc() > 1) \
         THROW_ERROR("Locale: " #FUNC "(): Invalid arguments"); \
     QLocale::FormatType format = QLocale::LongFormat;\
-    if (callData->argc == 1) { \
+    if (callData->argc() == 1) { \
         quint32 intFormat = callData->args[0].toUInt32(); \
         format = QLocale::FormatType(intFormat); \
     } \
-    scope.result = scope.engine->newString(locale-> FUNC (format)); \
+    RETURN_RESULT(scope.engine->newString(locale-> FUNC (format))); \
 }
 
 LOCALE_FORMAT(dateTimeFormat)
@@ -579,18 +579,19 @@ LOCALE_FORMAT(dateFormat)
 
 // +1 added to idx because JS is 0-based, whereas QLocale months begin at 1.
 #define LOCALE_FORMATTED_MONTHNAME(VARIABLE) \
-void QQmlLocaleData::method_ ## VARIABLE (const BuiltinFunction *, Scope &scope, CallData *callData) {\
+ReturnedValue QQmlLocaleData::method_ ## VARIABLE (const BuiltinFunction *b, CallData *callData) {\
+    Scope scope(b); \
     QLocale *locale = getThisLocale(scope, callData); \
     if (!locale) \
-        return; \
-    if (callData->argc < 1 || callData->argc > 2) \
+        return Encode::undefined(); \
+    if (callData->argc() < 1 || callData->argc() > 2) \
         THROW_ERROR("Locale: " #VARIABLE "(): Invalid arguments"); \
     QLocale::FormatType enumFormat = QLocale::LongFormat; \
     int idx = callData->args[0].toInt32() + 1; \
     if (idx < 1 || idx > 12) \
         THROW_ERROR("Locale: Invalid month"); \
     QString name; \
-    if (callData->argc == 2) { \
+    if (callData->argc() == 2) { \
         if (callData->args[1].isNumber()) { \
             quint32 intFormat = callData->args[1].toUInt32(); \
             QLocale::FormatType format = QLocale::FormatType(intFormat); \
@@ -601,16 +602,17 @@ void QQmlLocaleData::method_ ## VARIABLE (const BuiltinFunction *, Scope &scope,
     } else { \
         name = locale-> VARIABLE(idx, enumFormat); \
     } \
-    scope.result = scope.engine->newString(name); \
+    RETURN_RESULT(scope.engine->newString(name)); \
 }
 
 // 0 -> 7 as Qt::Sunday is 7, but Sunday is 0 in JS Date
 #define LOCALE_FORMATTED_DAYNAME(VARIABLE) \
-void QQmlLocaleData::method_ ## VARIABLE (const BuiltinFunction *, Scope &scope, CallData *callData) {\
+ReturnedValue QQmlLocaleData::method_ ## VARIABLE (const BuiltinFunction *b, CallData *callData) {\
+    Scope scope(b); \
     QLocale *locale = getThisLocale(scope, callData); \
     if (!locale) \
-        return; \
-    if (callData->argc < 1 || callData->argc > 2) \
+        return Encode::undefined(); \
+    if (callData->argc() < 1 || callData->argc() > 2) \
         THROW_ERROR("Locale: " #VARIABLE "(): Invalid arguments"); \
     QLocale::FormatType enumFormat = QLocale::LongFormat; \
     int idx = callData->args[0].toInt32(); \
@@ -618,7 +620,7 @@ void QQmlLocaleData::method_ ## VARIABLE (const BuiltinFunction *, Scope &scope,
         THROW_ERROR("Locale: Invalid day"); \
     if (idx == 0) idx = 7; \
     QString name; \
-    if (callData->argc == 2) { \
+    if (callData->argc() == 2) { \
         if (callData->args[1].isNumber()) { \
             quint32 intFormat = callData->args[1].toUInt32(); \
             QLocale::FormatType format = QLocale::FormatType(intFormat); \
@@ -629,7 +631,7 @@ void QQmlLocaleData::method_ ## VARIABLE (const BuiltinFunction *, Scope &scope,
     } else { \
         name = locale-> VARIABLE(idx, enumFormat); \
     } \
-    scope.result = scope.engine->newString(name); \
+    RETURN_RESULT(scope.engine->newString(name)); \
 }
 
 LOCALE_FORMATTED_MONTHNAME(monthName)
@@ -637,12 +639,14 @@ LOCALE_FORMATTED_MONTHNAME(standaloneMonthName)
 LOCALE_FORMATTED_DAYNAME(dayName)
 LOCALE_FORMATTED_DAYNAME(standaloneDayName)
 
-#define LOCALE_STRING_PROPERTY(VARIABLE) void QQmlLocaleData::method_get_ ## VARIABLE (const BuiltinFunction *, Scope &scope, CallData *callData) \
+#define LOCALE_STRING_PROPERTY(VARIABLE) \
+ReturnedValue QQmlLocaleData::method_get_ ## VARIABLE (const BuiltinFunction *b, CallData *callData) \
 { \
+    Scope scope(b); \
     QLocale *locale = getThisLocale(scope, callData); \
     if (!locale) \
-        return; \
-    scope.result = scope.engine->newString(locale-> VARIABLE());\
+        return Encode::undefined(); \
+    RETURN_RESULT(scope.engine->newString(locale-> VARIABLE()));\
 }
 
 LOCALE_STRING_PROPERTY(name)
@@ -833,22 +837,18 @@ void QQmlLocale::registerStringLocaleCompare(QV4::ExecutionEngine *engine)
     engine->stringPrototype()->defineDefaultProperty(QStringLiteral("localeCompare"), method_localeCompare);
 }
 
-void QQmlLocale::method_localeCompare(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue QQmlLocale::method_localeCompare(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1 || (!callData->args[0].isString() && !callData->args[0].as<StringObject>())) {
-        QV4::StringPrototype::method_localeCompare(b, scope, callData);
-        return;
-    }
+    if (callData->argc() != 1 || (!callData->args[0].isString() && !callData->args[0].as<StringObject>()))
+        return QV4::StringPrototype::method_localeCompare(b, &callData->thisObject, callData->args, callData->argc());
 
-    if (!callData->thisObject.isString() && !callData->thisObject.as<StringObject>()) {
-        QV4::StringPrototype::method_localeCompare(b, scope, callData);
-        return;
-    }
+    if (!callData->thisObject.isString() && !callData->thisObject.as<StringObject>())
+        return QV4::StringPrototype::method_localeCompare(b, &callData->thisObject, callData->args, callData->argc());
 
     QString thisString = callData->thisObject.toQStringNoThrow();
     QString thatString = callData->args[0].toQStringNoThrow();
 
-    scope.result = QV4::Encode(QString::localeAwareCompare(thisString, thatString));
+    return QV4::Encode(QString::localeAwareCompare(thisString, thatString));
 }
 
 /*!
diff --git a/src/qml/qml/qqmllocale_p.h b/src/qml/qml/qqmllocale_p.h
index 1a2ffc72b0..a81fe07b8e 100644
--- a/src/qml/qml/qqmllocale_p.h
+++ b/src/qml/qml/qqmllocale_p.h
@@ -67,13 +67,13 @@ public:
     static void registerExtension(QV4::ExecutionEngine *engine);
 
 private:
-    static void method_toLocaleString(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_toLocaleTimeString(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_toLocaleDateString(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_fromLocaleString(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_fromLocaleTimeString(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_fromLocaleDateString(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_timeZoneUpdated(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static QV4::ReturnedValue method_toLocaleString(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_toLocaleTimeString(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_toLocaleDateString(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_fromLocaleString(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_fromLocaleTimeString(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_fromLocaleDateString(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_timeZoneUpdated(const QV4::BuiltinFunction *, QV4::CallData *callData);
 };
 
 
@@ -83,9 +83,9 @@ public:
     static void registerExtension(QV4::ExecutionEngine *engine);
 
 private:
-    static void method_toLocaleString(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_fromLocaleString(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_toLocaleCurrencyString(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static QV4::ReturnedValue method_toLocaleString(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_fromLocaleString(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_toLocaleCurrencyString(const QV4::BuiltinFunction *, QV4::CallData *callData);
 };
 
 
@@ -135,7 +135,7 @@ public:
 private:
     QQmlLocale();
 
-    static void method_localeCompare(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static QV4::ReturnedValue method_localeCompare(const QV4::BuiltinFunction *, QV4::CallData *callData);
 };
 
 namespace QV4 {
@@ -168,33 +168,33 @@ struct QQmlLocaleData : public QV4::Object
         return thisObject->d()->locale;
     }
 
-    static void method_currencySymbol(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_dateTimeFormat(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_timeFormat(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_dateFormat(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_monthName(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_standaloneMonthName(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_dayName(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_standaloneDayName(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-
-    static void method_get_firstDayOfWeek(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_measurementSystem(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_textDirection(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_weekDays(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_uiLanguages(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-
-    static void method_get_name(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_nativeLanguageName(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_nativeCountryName(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_decimalPoint(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_groupSeparator(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_percent(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_zeroDigit(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_negativeSign(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_positiveSign(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_exponential(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_amText(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_pmText(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static QV4::ReturnedValue method_currencySymbol(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_dateTimeFormat(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_timeFormat(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_dateFormat(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_monthName(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_standaloneMonthName(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_dayName(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_standaloneDayName(const QV4::BuiltinFunction *, QV4::CallData *callData);
+
+    static QV4::ReturnedValue method_get_firstDayOfWeek(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_measurementSystem(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_textDirection(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_weekDays(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_uiLanguages(const QV4::BuiltinFunction *, QV4::CallData *callData);
+
+    static QV4::ReturnedValue method_get_name(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_nativeLanguageName(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_nativeCountryName(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_decimalPoint(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_groupSeparator(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_percent(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_zeroDigit(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_negativeSign(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_positiveSign(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_exponential(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_amText(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue method_get_pmText(const QV4::BuiltinFunction *, QV4::CallData *callData);
 };
 
 }
diff --git a/src/qml/qml/qqmlmetatype.cpp b/src/qml/qml/qqmlmetatype.cpp
index 4f69017ff0..5836c85666 100644
--- a/src/qml/qml/qqmlmetatype.cpp
+++ b/src/qml/qml/qqmlmetatype.cpp
@@ -260,8 +260,6 @@ void QQmlMetaTypeData::registerType(QQmlTypePrivate *priv)
 
 void QQmlType::SingletonInstanceInfo::init(QQmlEngine *e)
 {
-    QV4::ExecutionEngine *v4 = QV8Engine::getV4(e->handle());
-    v4->pushGlobalContext();
     if (scriptCallback && scriptApi(e).isUndefined()) {
         setScriptApi(e, scriptCallback(e, e));
     } else if (qobjectCallback && !qobjectApi(e)) {
@@ -277,7 +275,6 @@ void QQmlType::SingletonInstanceInfo::init(QQmlEngine *e)
         QObject *o = component.create();
         setQObjectApi(e, o);
     }
-    v4->popContext();
 }
 
 void QQmlType::SingletonInstanceInfo::destroy(QQmlEngine *e)
diff --git a/src/qml/qml/qqmltypeloader.cpp b/src/qml/qml/qqmltypeloader.cpp
index 494b3d30bc..55e05afdaa 100644
--- a/src/qml/qml/qqmltypeloader.cpp
+++ b/src/qml/qml/qqmltypeloader.cpp
@@ -44,6 +44,7 @@
 #include <private/qqmlengine_p.h>
 #include <private/qqmlglobal_p.h>
 #include <private/qqmlthread_p.h>
+#include <private/qv4codegen_p.h>
 #include <private/qqmlcomponent_p.h>
 #include <private/qqmlprofiler_p.h>
 #include <private/qqmlmemoryprofiler_p.h>
@@ -2080,10 +2081,10 @@ bool QQmlTypeData::tryLoadFromDiskCache()
     if (!v4)
         return false;
 
-    QQmlRefPointer<QV4::CompiledData::CompilationUnit> unit = v4->iselFactory->createUnitForLoading();
+    QQmlRefPointer<QV4::CompiledData::CompilationUnit> unit = QV4::Compiler::Codegen::createUnitForLoading();
     {
         QString error;
-        if (!unit->loadFromDisk(url(), m_backupSourceCode.sourceTimeStamp(), v4->iselFactory.data(), &error)) {
+        if (!unit->loadFromDisk(url(), m_backupSourceCode.sourceTimeStamp(), &error)) {
             qCDebug(DBG_DISK_CACHE) << "Error loading" << url().toString() << "from disk cache:" << error;
             return false;
         }
@@ -2447,7 +2448,7 @@ void QQmlTypeData::restoreIR(QQmlRefPointer<QV4::CompiledData::CompilationUnit>
     m_document.reset(new QmlIR::Document(isDebugging()));
     QmlIR::IRLoader loader(unit->data, m_document.data());
     loader.load();
-    m_document->jsModule.setFileName(finalUrlString());
+    m_document->jsModule.fileName = finalUrlString();
     m_document->javaScriptCompilationUnit = unit;
     continueLoadFromIR();
 }
@@ -2564,7 +2565,7 @@ void QQmlTypeData::compile(const QQmlRefPointer<QQmlTypeNameCache> &typeNameCach
         QString errorString;
         if (m_compiledData->saveToDisk(url(), &errorString)) {
             QString error;
-            if (!m_compiledData->loadFromDisk(url(), m_backupSourceCode.sourceTimeStamp(), enginePrivate->v4engine()->iselFactory.data(), &error)) {
+            if (!m_compiledData->loadFromDisk(url(), m_backupSourceCode.sourceTimeStamp(), &error)) {
                 // ignore error, keep using the in-memory compilation unit.
             }
         } else {
@@ -2881,7 +2882,7 @@ QV4::ReturnedValue QQmlScriptData::scriptValueForContext(QQmlContextData *parent
             ep->warning(error);
     }
 
-    QV4::ScopedValue retval(scope, qmlContext->d()->qml);
+    QV4::ScopedValue retval(scope, qmlContext->d()->qml());
     if (shared) {
         m_value.set(scope.engine, retval);
         m_loaded = true;
@@ -2923,19 +2924,12 @@ QQmlScriptData *QQmlScriptBlob::scriptData() const
     return m_scriptData;
 }
 
-struct EmptyCompilationUnit : public QV4::CompiledData::CompilationUnit
-{
-    void linkBackendToEngine(QV4::ExecutionEngine *) override {}
-};
-
 void QQmlScriptBlob::dataReceived(const SourceCodeData &data)
 {
-    QV4::ExecutionEngine *v4 = QV8Engine::getV4(m_typeLoader->engine());
-
     if (!disableDiskCache() || forceDiskCache()) {
-        QQmlRefPointer<QV4::CompiledData::CompilationUnit> unit = v4->iselFactory->createUnitForLoading();
+        QQmlRefPointer<QV4::CompiledData::CompilationUnit> unit = QV4::Compiler::Codegen::createUnitForLoading();
         QString error;
-        if (unit->loadFromDisk(url(), data.sourceTimeStamp(), v4->iselFactory.data(), &error)) {
+        if (unit->loadFromDisk(url(), data.sourceTimeStamp(), &error)) {
             initializeFromCompilationUnit(unit);
             return;
         } else {
@@ -2957,7 +2951,7 @@ void QQmlScriptBlob::dataReceived(const SourceCodeData &data)
     QmlIR::ScriptDirectivesCollector collector(&irUnit.jsParserEngine, &irUnit.jsGenerator);
 
     QList<QQmlError> errors;
-    QQmlRefPointer<QV4::CompiledData::CompilationUnit> unit = QV4::Script::precompile(&irUnit.jsModule, &irUnit.jsGenerator, v4, finalUrl(), source, &errors, &collector);
+    QQmlRefPointer<QV4::CompiledData::CompilationUnit> unit = QV4::Script::precompile(&irUnit.jsModule, &irUnit.jsGenerator, finalUrl(), source, &errors, &collector);
     // No need to addref on unit, it's initial refcount is 1
     source.clear();
     if (!errors.isEmpty()) {
@@ -2965,7 +2959,7 @@ void QQmlScriptBlob::dataReceived(const SourceCodeData &data)
         return;
     }
     if (!unit) {
-        unit.adopt(new EmptyCompilationUnit);
+        unit.adopt(new QV4::CompiledData::CompilationUnit);
     }
     irUnit.javaScriptCompilationUnit = unit;
     irUnit.imports = collector.imports;
diff --git a/src/qml/qml/qqmltypewrapper_p.h b/src/qml/qml/qqmltypewrapper_p.h
index bb65093163..25ff7ba7c8 100644
--- a/src/qml/qml/qqmltypewrapper_p.h
+++ b/src/qml/qml/qqmltypewrapper_p.h
@@ -60,6 +60,9 @@
 QT_BEGIN_NAMESPACE
 
 class QQmlTypeNameCache;
+class QQmlType;
+class QQmlTypePrivate;
+struct QQmlImportRef;
 
 namespace QV4 {
 
diff --git a/src/qml/qml/qqmlvaluetypewrapper.cpp b/src/qml/qml/qqmlvaluetypewrapper.cpp
index a5cdccc97a..90ca08537c 100644
--- a/src/qml/qml/qqmlvaluetypewrapper.cpp
+++ b/src/qml/qml/qqmlvaluetypewrapper.cpp
@@ -316,8 +316,9 @@ bool QQmlValueTypeWrapper::write(QObject *target, int propertyIndex) const
     return true;
 }
 
-void QQmlValueTypeWrapper::method_toString(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QQmlValueTypeWrapper::method_toString(const BuiltinFunction *b, CallData *callData)
 {
+    Scope scope(b);
     Object *o = callData->thisObject.as<Object>();
     if (!o)
         THROW_TYPE_ERROR();
@@ -350,7 +351,7 @@ void QQmlValueTypeWrapper::method_toString(const BuiltinFunction *, Scope &scope
         }
         result += QLatin1Char(')');
     }
-    scope.result = scope.engine->newString(result);
+    return Encode(scope.engine->newString(result));
 }
 
 ReturnedValue QQmlValueTypeWrapper::get(const Managed *m, String *name, bool *hasProperty)
@@ -472,13 +473,13 @@ bool QQmlValueTypeWrapper::put(Managed *m, String *name, const Value &value)
                 if (auto binding = QQmlPropertyPrivate::binding(referenceObject, QQmlPropertyIndex(referencePropertyIndex, pd->coreIndex()))) {
                     Q_ASSERT(!binding->isValueTypeProxy());
                     const auto qmlBinding = static_cast<const QQmlBinding*>(binding);
-                    const auto stackFrame = v4->currentStackFrame();
+                    const auto stackFrame = v4->currentStackFrame;
                     qCInfo(lcBindingRemoval,
                            "Overwriting binding on %s::%s which was initially bound at %s by setting \"%s\" at %s:%d",
                            referenceObject->metaObject()->className(), referenceObject->metaObject()->property(referencePropertyIndex).name(),
                            qPrintable(qmlBinding->expressionIdentifier()),
                            metaObject->property(pd->coreIndex()).name(),
-                           qPrintable(stackFrame.source), stackFrame.line);
+                           qPrintable(stackFrame->source()), stackFrame->lineNumber());
                 }
             }
             QQmlPropertyPrivate::removeBinding(referenceObject, QQmlPropertyIndex(referencePropertyIndex, pd->coreIndex()));
diff --git a/src/qml/qml/qqmlvaluetypewrapper_p.h b/src/qml/qml/qqmlvaluetypewrapper_p.h
index c8aac719ab..da03af6dbc 100644
--- a/src/qml/qml/qqmlvaluetypewrapper_p.h
+++ b/src/qml/qml/qqmlvaluetypewrapper_p.h
@@ -56,6 +56,7 @@
 
 #include <private/qv4value_p.h>
 #include <private/qv4object_p.h>
+#include <private/qqmlpropertycache_p.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -111,7 +112,7 @@ public:
     static PropertyAttributes query(const Managed *, String *name);
     static void advanceIterator(Managed *m, ObjectIterator *it, Value *name, uint *index, Property *p, PropertyAttributes *attributes);
 
-    static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_toString(const BuiltinFunction *, CallData *callData);
 
     static void initProto(ExecutionEngine *v4);
 };
diff --git a/src/qml/qml/qqmlvmemetaobject.cpp b/src/qml/qml/qqmlvmemetaobject.cpp
index dde8784eb1..281d64ac79 100644
--- a/src/qml/qml/qqmlvmemetaobject.cpp
+++ b/src/qml/qml/qqmlvmemetaobject.cpp
@@ -55,6 +55,7 @@
 #include <private/qv4variantobject_p.h>
 #include <private/qv4functionobject_p.h>
 #include <private/qv4scopedvalue_p.h>
+#include <private/qv4jscall_p.h>
 #include <private/qv4qobjectwrapper_p.h>
 
 QT_BEGIN_NAMESPACE
@@ -949,20 +950,20 @@ int QQmlVMEMetaObject::metaCall(QObject *o, QMetaObject::Call c, int _id, void *
                 }
 
                 const unsigned int parameterCount = function->formalParameterCount();
-                QV4::ScopedCallData callData(scope, parameterCount);
-                callData->thisObject = ep->v8engine()->global();
+                QV4::JSCallData jsCallData(scope, parameterCount);
+                *jsCallData->thisObject = ep->v8engine()->global();
 
                 for (uint ii = 0; ii < parameterCount; ++ii)
-                    callData->args[ii] = scope.engine->fromVariant(*(QVariant *)a[ii + 1]);
+                    jsCallData->args[ii] = scope.engine->fromVariant(*(QVariant *)a[ii + 1]);
 
-                function->call(scope, callData);
+                QV4::ScopedValue result(scope, function->call(jsCallData));
                 if (scope.hasException()) {
                     QQmlError error = scope.engine->catchExceptionAsQmlError();
                     if (error.isValid())
                         ep->warning(error);
                     if (a[0]) *(QVariant *)a[0] = QVariant();
                 } else {
-                    if (a[0]) *(QVariant *)a[0] = scope.engine->toVariant(scope.result, 0);
+                    if (a[0]) *(QVariant *)a[0] = scope.engine->toVariant(result, 0);
                 }
 
                 ep->dereferenceScarceResources(); // "release" scarce resources if top-level expression evaluation is complete.
diff --git a/src/qml/qml/qqmlxmlhttprequest.cpp b/src/qml/qml/qqmlxmlhttprequest.cpp
index 08f3d35e46..08842e714c 100644
--- a/src/qml/qml/qqmlxmlhttprequest.cpp
+++ b/src/qml/qml/qqmlxmlhttprequest.cpp
@@ -51,6 +51,7 @@
 #include <private/qv4engine_p.h>
 #include <private/qv4functionobject_p.h>
 #include <private/qv4scopedvalue_p.h>
+#include <private/qv4jscall_p.h>
 
 #include <QtCore/qobject.h>
 #include <QtQml/qjsvalue.h>
@@ -74,8 +75,7 @@ using namespace QV4;
 #define V4THROW_REFERENCE(string) \
     do { \
         ScopedObject error(scope, scope.engine->newReferenceErrorObject(QStringLiteral(string))); \
-        scope.result = scope.engine->throwError(error); \
-        return; \
+        return scope.engine->throwError(error); \
     } while (false)
 
 QT_BEGIN_NAMESPACE
@@ -276,25 +276,25 @@ public:
     static void initClass(ExecutionEngine *engine);
 
     // JS API
-    static void method_get_nodeName(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_nodeValue(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_nodeType(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_namespaceUri(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-
-    static void method_get_parentNode(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_childNodes(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_firstChild(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_lastChild(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_previousSibling(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_nextSibling(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_attributes(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-
-    //static void ownerDocument(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    //static void namespaceURI(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    //static void prefix(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    //static void localName(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    //static void baseURI(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    //static void textContent(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static ReturnedValue method_get_nodeName(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_nodeValue(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_nodeType(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_namespaceUri(const BuiltinFunction *b, QV4::CallData *callData);
+
+    static ReturnedValue method_get_parentNode(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_childNodes(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_firstChild(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_lastChild(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_previousSibling(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_nextSibling(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_attributes(const BuiltinFunction *b, QV4::CallData *callData);
+
+    //static ReturnedValue ownerDocument(const BuiltinFunction *b, QV4::CallData *callData);
+    //static ReturnedValue namespaceURI(const BuiltinFunction *b, QV4::CallData *callData);
+    //static ReturnedValue prefix(const BuiltinFunction *b, QV4::CallData *callData);
+    //static ReturnedValue localName(const BuiltinFunction *b, QV4::CallData *callData);
+    //static ReturnedValue baseURI(const BuiltinFunction *b, QV4::CallData *callData);
+    //static ReturnedValue textContent(const BuiltinFunction *b, QV4::CallData *callData);
 
     static ReturnedValue getProto(ExecutionEngine *v4);
 
@@ -355,10 +355,10 @@ class Attr : public Node
 {
 public:
     // JS API
-    static void method_name(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static ReturnedValue method_name(const BuiltinFunction *b, QV4::CallData *callData);
 //    static void specified(CallContext *);
-    static void method_value(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_ownerElement(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static ReturnedValue method_value(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_ownerElement(const BuiltinFunction *b, QV4::CallData *callData);
 //    static void schemaTypeInfo(CallContext *);
 //    static void isId(CallContext *c);
 
@@ -370,7 +370,7 @@ class CharacterData : public Node
 {
 public:
     // JS API
-    static void method_length(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static ReturnedValue method_length(const BuiltinFunction *b, QV4::CallData *callData);
 
     // C++ API
     static ReturnedValue prototype(ExecutionEngine *v4);
@@ -380,8 +380,8 @@ class Text : public CharacterData
 {
 public:
     // JS API
-    static void method_isElementContentWhitespace(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_wholeText(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static ReturnedValue method_isElementContentWhitespace(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_wholeText(const BuiltinFunction *b, QV4::CallData *callData);
 
     // C++ API
     static ReturnedValue prototype(ExecutionEngine *);
@@ -398,10 +398,10 @@ class Document : public Node
 {
 public:
     // JS API
-    static void method_xmlVersion(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_xmlEncoding(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_xmlStandalone(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_documentElement(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static ReturnedValue method_xmlVersion(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_xmlEncoding(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_xmlStandalone(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_documentElement(const BuiltinFunction *b, QV4::CallData *callData);
 
     // C++ API
     static ReturnedValue prototype(ExecutionEngine *);
@@ -420,8 +420,9 @@ void NodeImpl::release()
     document->release();
 }
 
-void NodePrototype::method_get_nodeName(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue NodePrototype::method_get_nodeName(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         THROW_TYPE_ERROR();
@@ -441,11 +442,12 @@ void NodePrototype::method_get_nodeName(const QV4::BuiltinFunction *, QV4::Scope
         name = r->d()->d->name;
         break;
     }
-    scope.result = Encode(scope.engine->newString(name));
+    return Encode(scope.engine->newString(name));
 }
 
-void NodePrototype::method_get_nodeValue(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue NodePrototype::method_get_nodeValue(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         THROW_TYPE_ERROR();
@@ -459,74 +461,81 @@ void NodePrototype::method_get_nodeValue(const QV4::BuiltinFunction *, QV4::Scop
         r->d()->d->type == NodeImpl::Notation)
         RETURN_RESULT(Encode::null());
 
-    scope.result = Encode(scope.engine->newString(r->d()->d->data));
+    return Encode(scope.engine->newString(r->d()->d->data));
 }
 
-void NodePrototype::method_get_nodeType(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue NodePrototype::method_get_nodeType(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         THROW_TYPE_ERROR();
 
-    scope.result = Encode(r->d()->d->type);
+    return Encode(r->d()->d->type);
 }
 
-void NodePrototype::method_get_namespaceUri(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue NodePrototype::method_get_namespaceUri(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         THROW_TYPE_ERROR();
 
-    scope.result = Encode(scope.engine->newString(r->d()->d->namespaceUri));
+    return Encode(scope.engine->newString(r->d()->d->namespaceUri));
 }
 
-void NodePrototype::method_get_parentNode(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue NodePrototype::method_get_parentNode(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         THROW_TYPE_ERROR();
 
     if (r->d()->d->parent)
-        scope.result = Node::create(scope.engine, r->d()->d->parent);
+        return Node::create(scope.engine, r->d()->d->parent);
     else
-        scope.result = Encode::null();
+        return Encode::null();
 }
 
-void NodePrototype::method_get_childNodes(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue NodePrototype::method_get_childNodes(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         THROW_TYPE_ERROR();
 
-    scope.result = NodeList::create(scope.engine, r->d()->d);
+    return NodeList::create(scope.engine, r->d()->d);
 }
 
-void NodePrototype::method_get_firstChild(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue NodePrototype::method_get_firstChild(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         THROW_TYPE_ERROR();
 
     if (r->d()->d->children.isEmpty())
-        scope.result = Encode::null();
+        return Encode::null();
     else
-        scope.result = Node::create(scope.engine, r->d()->d->children.constFirst());
+        return Node::create(scope.engine, r->d()->d->children.constFirst());
 }
 
-void NodePrototype::method_get_lastChild(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue NodePrototype::method_get_lastChild(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         THROW_TYPE_ERROR();
 
     if (r->d()->d->children.isEmpty())
-        scope.result = Encode::null();
+        return Encode::null();
     else
-        scope.result = Node::create(scope.engine, r->d()->d->children.constLast());
+        return Node::create(scope.engine, r->d()->d->children.constLast());
 }
 
-void NodePrototype::method_get_previousSibling(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue NodePrototype::method_get_previousSibling(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         THROW_TYPE_ERROR();
@@ -537,18 +546,18 @@ void NodePrototype::method_get_previousSibling(const QV4::BuiltinFunction *, QV4
     for (int ii = 0; ii < r->d()->d->parent->children.count(); ++ii) {
         if (r->d()->d->parent->children.at(ii) == r->d()->d) {
             if (ii == 0)
-                scope.result = Encode::null();
+                return Encode::null();
             else
-                scope.result = Node::create(scope.engine, r->d()->d->parent->children.at(ii - 1));
-            return;
+                return Node::create(scope.engine, r->d()->d->parent->children.at(ii - 1));
         }
     }
 
-    scope.result = Encode::null();
+    return Encode::null();
 }
 
-void NodePrototype::method_get_nextSibling(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue NodePrototype::method_get_nextSibling(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         THROW_TYPE_ERROR();
@@ -559,26 +568,26 @@ void NodePrototype::method_get_nextSibling(const QV4::BuiltinFunction *, QV4::Sc
     for (int ii = 0; ii < r->d()->d->parent->children.count(); ++ii) {
         if (r->d()->d->parent->children.at(ii) == r->d()->d) {
             if ((ii + 1) == r->d()->d->parent->children.count())
-                scope.result = Encode::null();
+                return Encode::null();
             else
-                scope.result = Node::create(scope.engine, r->d()->d->parent->children.at(ii + 1));
-            return;
+                return Node::create(scope.engine, r->d()->d->parent->children.at(ii + 1));
         }
     }
 
-    scope.result = Encode::null();
+    return Encode::null();
 }
 
-void NodePrototype::method_get_attributes(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue NodePrototype::method_get_attributes(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         THROW_TYPE_ERROR();
 
     if (r->d()->d->type != NodeImpl::Element)
-        scope.result = Encode::null();
+        return Encode::null();
     else
-        scope.result = NamedNodeMap::create(scope.engine, r->d()->d, r->d()->d->attributes);
+        return NamedNodeMap::create(scope.engine, r->d()->d, r->d()->d->attributes);
 }
 
 ReturnedValue NodePrototype::getProto(ExecutionEngine *v4)
@@ -659,40 +668,44 @@ ReturnedValue Attr::prototype(ExecutionEngine *engine)
     return d->attrPrototype.value();
 }
 
-void Attr::method_name(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue Attr::method_name(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         RETURN_UNDEFINED();
 
-    scope.result = scope.engine->newString(r->d()->d->name);
+    return Encode(scope.engine->newString(r->d()->d->name));
 }
 
-void Attr::method_value(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue Attr::method_value(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         RETURN_UNDEFINED();
 
-    scope.result = scope.engine->newString(r->d()->d->data);
+    return Encode(scope.engine->newString(r->d()->d->data));
 }
 
-void Attr::method_ownerElement(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue Attr::method_ownerElement(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         RETURN_UNDEFINED();
 
-    scope.result = Node::create(scope.engine, r->d()->d->parent);
+    return Node::create(scope.engine, r->d()->d->parent);
 }
 
-void CharacterData::method_length(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue CharacterData::method_length(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         RETURN_UNDEFINED();
 
-    scope.result = Encode(r->d()->d->data.length());
+    return Encode(r->d()->d->data.length());
 }
 
 ReturnedValue CharacterData::prototype(ExecutionEngine *v4)
@@ -711,22 +724,24 @@ ReturnedValue CharacterData::prototype(ExecutionEngine *v4)
     return d->characterDataPrototype.value();
 }
 
-void Text::method_isElementContentWhitespace(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue Text::method_isElementContentWhitespace(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         RETURN_UNDEFINED();
 
-    scope.result = Encode(QStringRef(&r->d()->d->data).trimmed().isEmpty());
+    return Encode(QStringRef(&r->d()->d->data).trimmed().isEmpty());
 }
 
-void Text::method_wholeText(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue Text::method_wholeText(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r)
         RETURN_UNDEFINED();
 
-    scope.result = scope.engine->newString(r->d()->d->data);
+    return Encode(scope.engine->newString(r->d()->d->data));
 }
 
 ReturnedValue Text::prototype(ExecutionEngine *v4)
@@ -952,40 +967,44 @@ ReturnedValue NodeList::create(ExecutionEngine *v4, NodeImpl *data)
     return (v4->memoryManager->allocObject<NodeList>(data))->asReturnedValue();
 }
 
-void Document::method_documentElement(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue Document::method_documentElement(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r || r->d()->d->type != NodeImpl::Document)
         RETURN_UNDEFINED();
 
-    scope.result = Node::create(scope.engine, static_cast<DocumentImpl *>(r->d()->d)->root);
+    return Node::create(scope.engine, static_cast<DocumentImpl *>(r->d()->d)->root);
 }
 
-void Document::method_xmlStandalone(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue Document::method_xmlStandalone(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r || r->d()->d->type != NodeImpl::Document)
         RETURN_UNDEFINED();
 
-    scope.result = Encode(static_cast<DocumentImpl *>(r->d()->d)->isStandalone);
+    return Encode(static_cast<DocumentImpl *>(r->d()->d)->isStandalone);
 }
 
-void Document::method_xmlVersion(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue Document::method_xmlVersion(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r || r->d()->d->type != NodeImpl::Document)
         RETURN_UNDEFINED();
 
-    scope.result = scope.engine->newString(static_cast<DocumentImpl *>(r->d()->d)->version);
+    return Encode(scope.engine->newString(static_cast<DocumentImpl *>(r->d()->d)->version));
 }
 
-void Document::method_xmlEncoding(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue Document::method_xmlEncoding(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<Node> r(scope, callData->thisObject.as<Node>());
     if (!r || r->d()->d->type != NodeImpl::Document)
         RETURN_UNDEFINED();
 
-    scope.result = scope.engine->newString(static_cast<DocumentImpl *>(r->d()->d)->encoding);
+    return Encode(scope.engine->newString(static_cast<DocumentImpl *>(r->d()->d)->encoding));
 }
 
 class QQmlXMLHttpRequest : public QObject
@@ -1557,9 +1576,8 @@ void QQmlXMLHttpRequest::dispatchCallback(Object *thisObj, QQmlContextData *cont
         return;
     }
 
-    QV4::ScopedCallData callData(scope);
-    callData->thisObject = Encode::undefined();
-    callback->call(scope, callData);
+    QV4::JSCallData jsCallData(scope);
+    callback->call(jsCallData);
 
     if (scope.engine->hasException) {
         QQmlError error = scope.engine->catchExceptionAsQmlError();
@@ -1601,7 +1619,7 @@ struct QQmlXMLHttpRequestWrapper : Object {
     Member(class, Pointer, Object *, proto)
 
 DECLARE_HEAP_OBJECT(QQmlXMLHttpRequestCtor, FunctionObject) {
-    DECLARE_MARK_TABLE(QQmlXMLHttpRequestCtor);
+    DECLARE_MARKOBJECTS(QQmlXMLHttpRequestCtor);
     void init(ExecutionEngine *engine);
 };
 
@@ -1617,42 +1635,39 @@ struct QQmlXMLHttpRequestCtor : public FunctionObject
 {
     V4_OBJECT2(QQmlXMLHttpRequestCtor, FunctionObject)
 
-    static void construct(const Managed *that, Scope &scope, QV4::CallData *)
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *, int)
     {
-        Scoped<QQmlXMLHttpRequestCtor> ctor(scope, that->as<QQmlXMLHttpRequestCtor>());
-        if (!ctor) {
-            scope.result = scope.engine->throwTypeError();
-            return;
-        }
+        Scope scope(f->engine());
+        const QQmlXMLHttpRequestCtor *ctor = static_cast<const QQmlXMLHttpRequestCtor *>(f);
 
         QQmlXMLHttpRequest *r = new QQmlXMLHttpRequest(scope.engine->v8Engine->networkAccessManager());
         Scoped<QQmlXMLHttpRequestWrapper> w(scope, scope.engine->memoryManager->allocObject<QQmlXMLHttpRequestWrapper>(r));
         ScopedObject proto(scope, ctor->d()->proto);
         w->setPrototype(proto);
-        scope.result = w.asReturnedValue();
+        return w.asReturnedValue();
     }
 
-    static void call(const Managed *, Scope &scope, QV4::CallData *) {
-        scope.result = Primitive::undefinedValue();
+    static ReturnedValue call(const FunctionObject *, const Value *, const Value *, int) {
+        return Encode::undefined();
     }
 
     void setupProto();
 
-    static void method_open(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_setRequestHeader(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_send(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_abort(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_getResponseHeader(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_getAllResponseHeaders(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-
-    static void method_get_readyState(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_status(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_statusText(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_responseText(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_responseXML(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_response(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_get_responseType(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void method_set_responseType(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static ReturnedValue method_open(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_setRequestHeader(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_send(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_abort(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_getResponseHeader(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_getAllResponseHeaders(const BuiltinFunction *b, QV4::CallData *callData);
+
+    static ReturnedValue method_get_readyState(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_status(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_statusText(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_responseText(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_responseXML(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_response(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_get_responseType(const BuiltinFunction *b, QV4::CallData *callData);
+    static ReturnedValue method_set_responseType(const BuiltinFunction *b, QV4::CallData *callData);
 };
 
 }
@@ -1714,14 +1729,15 @@ void QQmlXMLHttpRequestCtor::setupProto()
 
 
 // XMLHttpRequest methods
-void QQmlXMLHttpRequestCtor::method_open(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_open(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
     QQmlXMLHttpRequest *r = w->d()->request;
 
-    if (callData->argc < 2 || callData->argc > 5)
+    if (callData->argc() < 2 || callData->argc() > 5)
         THROW_DOM(DOMEXCEPTION_SYNTAX_ERR, "Incorrect argument count");
 
     // Argument 0 - Method
@@ -1744,15 +1760,15 @@ void QQmlXMLHttpRequestCtor::method_open(const QV4::BuiltinFunction *, QV4::Scop
 
     bool async = true;
     // Argument 2 - async (optional)
-    if (callData->argc > 2) {
+    if (callData->argc() > 2) {
         async = callData->args[2].booleanValue();
     }
 
     // Argument 3/4 - user/pass (optional)
     QString username, password;
-    if (callData->argc > 3)
+    if (callData->argc() > 3)
         username = callData->args[3].toQStringNoThrow();
-    if (callData->argc > 4)
+    if (callData->argc() > 4)
         password = callData->args[4].toQStringNoThrow();
 
     // Clear the fragment (if any)
@@ -1762,17 +1778,18 @@ void QQmlXMLHttpRequestCtor::method_open(const QV4::BuiltinFunction *, QV4::Scop
     if (!username.isNull()) url.setUserName(username);
     if (!password.isNull()) url.setPassword(password);
 
-    scope.result = r->open(w, scope.engine->callingQmlContext(), method, url, async ? QQmlXMLHttpRequest::AsynchronousLoad : QQmlXMLHttpRequest::SynchronousLoad);
+    return r->open(w, scope.engine->callingQmlContext(), method, url, async ? QQmlXMLHttpRequest::AsynchronousLoad : QQmlXMLHttpRequest::SynchronousLoad);
 }
 
-void QQmlXMLHttpRequestCtor::method_setRequestHeader(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_setRequestHeader(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
     QQmlXMLHttpRequest *r = w->d()->request;
 
-    if (callData->argc != 2)
+    if (callData->argc() != 2)
         THROW_DOM(DOMEXCEPTION_SYNTAX_ERR, "Incorrect argument count");
 
     if (r->readyState() != QQmlXMLHttpRequest::Opened || r->sendFlag())
@@ -1811,8 +1828,9 @@ void QQmlXMLHttpRequestCtor::method_setRequestHeader(const QV4::BuiltinFunction
     RETURN_UNDEFINED();
 }
 
-void QQmlXMLHttpRequestCtor::method_send(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_send(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
@@ -1823,7 +1841,7 @@ void QQmlXMLHttpRequestCtor::method_send(const QV4::BuiltinFunction *, QV4::Scop
         THROW_DOM(DOMEXCEPTION_INVALID_STATE_ERR, "Invalid state");
 
     QByteArray data;
-    if (callData->argc > 0) {
+    if (callData->argc() > 0) {
         if (const ArrayBuffer *buffer = callData->args[0].as<ArrayBuffer>()) {
             data = buffer->asByteArray();
         } else {
@@ -1831,27 +1849,29 @@ void QQmlXMLHttpRequestCtor::method_send(const QV4::BuiltinFunction *, QV4::Scop
         }
     }
 
-    scope.result = r->send(w, scope.engine->callingQmlContext(), data);
+    return r->send(w, scope.engine->callingQmlContext(), data);
 }
 
-void QQmlXMLHttpRequestCtor::method_abort(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_abort(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
     QQmlXMLHttpRequest *r = w->d()->request;
 
-    scope.result = r->abort(w, scope.engine->callingQmlContext());
+    return r->abort(w, scope.engine->callingQmlContext());
 }
 
-void QQmlXMLHttpRequestCtor::method_getResponseHeader(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_getResponseHeader(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
     QQmlXMLHttpRequest *r = w->d()->request;
 
-    if (callData->argc != 1)
+    if (callData->argc() != 1)
         THROW_DOM(DOMEXCEPTION_SYNTAX_ERR, "Incorrect argument count");
 
     if (r->readyState() != QQmlXMLHttpRequest::Loading &&
@@ -1859,17 +1879,18 @@ void QQmlXMLHttpRequestCtor::method_getResponseHeader(const QV4::BuiltinFunction
         r->readyState() != QQmlXMLHttpRequest::HeadersReceived)
         THROW_DOM(DOMEXCEPTION_INVALID_STATE_ERR, "Invalid state");
 
-    scope.result = scope.engine->newString(r->header(callData->args[0].toQStringNoThrow()));
+    return Encode(scope.engine->newString(r->header(callData->args[0].toQStringNoThrow())));
 }
 
-void QQmlXMLHttpRequestCtor::method_getAllResponseHeaders(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_getAllResponseHeaders(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
     QQmlXMLHttpRequest *r = w->d()->request;
 
-    if (callData->argc != 0)
+    if (callData->argc() != 0)
         THROW_DOM(DOMEXCEPTION_SYNTAX_ERR, "Incorrect argument count");
 
     if (r->readyState() != QQmlXMLHttpRequest::Loading &&
@@ -1877,22 +1898,24 @@ void QQmlXMLHttpRequestCtor::method_getAllResponseHeaders(const QV4::BuiltinFunc
         r->readyState() != QQmlXMLHttpRequest::HeadersReceived)
         THROW_DOM(DOMEXCEPTION_INVALID_STATE_ERR, "Invalid state");
 
-    scope.result = scope.engine->newString(r->headers());
+    return Encode(scope.engine->newString(r->headers()));
 }
 
 // XMLHttpRequest properties
-void QQmlXMLHttpRequestCtor::method_get_readyState(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_get_readyState(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
     QQmlXMLHttpRequest *r = w->d()->request;
 
-    scope.result = Encode(r->readyState());
+    return Encode(r->readyState());
 }
 
-void QQmlXMLHttpRequestCtor::method_get_status(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_get_status(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
@@ -1903,13 +1926,14 @@ void QQmlXMLHttpRequestCtor::method_get_status(const QV4::BuiltinFunction *, QV4
         THROW_DOM(DOMEXCEPTION_INVALID_STATE_ERR, "Invalid state");
 
     if (r->errorFlag())
-        scope.result = Encode(0);
+        return Encode(0);
     else
-        scope.result = Encode(r->replyStatus());
+        return Encode(r->replyStatus());
 }
 
-void QQmlXMLHttpRequestCtor::method_get_statusText(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_get_statusText(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
@@ -1920,13 +1944,14 @@ void QQmlXMLHttpRequestCtor::method_get_statusText(const QV4::BuiltinFunction *,
         THROW_DOM(DOMEXCEPTION_INVALID_STATE_ERR, "Invalid state");
 
     if (r->errorFlag())
-        scope.result = scope.engine->newString(QString());
+        return Encode(scope.engine->newString(QString()));
     else
-        scope.result = scope.engine->newString(r->replyStatusText());
+        return Encode(scope.engine->newString(r->replyStatusText()));
 }
 
-void QQmlXMLHttpRequestCtor::method_get_responseText(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_get_responseText(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
@@ -1934,13 +1959,14 @@ void QQmlXMLHttpRequestCtor::method_get_responseText(const QV4::BuiltinFunction
 
     if (r->readyState() != QQmlXMLHttpRequest::Loading &&
         r->readyState() != QQmlXMLHttpRequest::Done)
-        scope.result = scope.engine->newString(QString());
+        return Encode(scope.engine->newString(QString()));
     else
-        scope.result = scope.engine->newString(r->responseBody());
+        return Encode(scope.engine->newString(r->responseBody()));
 }
 
-void QQmlXMLHttpRequestCtor::method_get_responseXML(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_get_responseXML(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
@@ -1949,16 +1975,17 @@ void QQmlXMLHttpRequestCtor::method_get_responseXML(const QV4::BuiltinFunction *
     if (!r->receivedXml() ||
         (r->readyState() != QQmlXMLHttpRequest::Loading &&
          r->readyState() != QQmlXMLHttpRequest::Done)) {
-        scope.result = Encode::null();
+        return Encode::null();
     } else {
         if (r->responseType().isEmpty())
             r->setResponseType(QLatin1String("document"));
-        scope.result = r->xmlResponseBody(scope.engine);
+        return r->xmlResponseBody(scope.engine);
     }
 }
 
-void QQmlXMLHttpRequestCtor::method_get_response(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_get_response(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
@@ -1983,29 +2010,31 @@ void QQmlXMLHttpRequestCtor::method_get_response(const QV4::BuiltinFunction *, Q
 }
 
 
-void QQmlXMLHttpRequestCtor::method_get_responseType(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_get_responseType(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
     QQmlXMLHttpRequest *r = w->d()->request;
-    scope.result = scope.engine->newString(r->responseType());
+    return Encode(scope.engine->newString(r->responseType()));
 }
 
-void QQmlXMLHttpRequestCtor::method_set_responseType(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+ReturnedValue QQmlXMLHttpRequestCtor::method_set_responseType(const BuiltinFunction *b, QV4::CallData *callData)
 {
+    Scope scope(b);
     Scoped<QQmlXMLHttpRequestWrapper> w(scope, callData->thisObject.as<QQmlXMLHttpRequestWrapper>());
     if (!w)
         V4THROW_REFERENCE("Not an XMLHttpRequest object");
     QQmlXMLHttpRequest *r = w->d()->request;
 
-    if (callData->argc < 1)
+    if (callData->argc() < 1)
         THROW_DOM(DOMEXCEPTION_SYNTAX_ERR, "Incorrect argument count");
 
     // Argument 0 - response type
     r->setResponseType(callData->args[0].toQStringNoThrow());
 
-    scope.result = Encode::undefined();
+    return Encode::undefined();
 }
 
 void qt_rem_qmlxmlhttprequest(ExecutionEngine * /* engine */, void *d)
diff --git a/src/qml/qml/v8/qqmlbuiltinfunctions.cpp b/src/qml/qml/v8/qqmlbuiltinfunctions.cpp
index 25d99e0c87..3627f29cb2 100644
--- a/src/qml/qml/v8/qqmlbuiltinfunctions.cpp
+++ b/src/qml/qml/v8/qqmlbuiltinfunctions.cpp
@@ -87,8 +87,7 @@ DEFINE_OBJECT_VTABLE(QtObject);
 
 #define THROW_TYPE_ERROR_WITH_MESSAGE(msg) \
     do { \
-        scope.result = scope.engine->throwTypeError(QString::fromUtf8(msg)); \
-        return; \
+        return scope.engine->throwTypeError(QString::fromUtf8(msg)); \
     } while (false)
 
 struct StaticQtMetaObject : public QObject
@@ -229,12 +228,12 @@ void QtObject::advanceIterator(Managed *m, ObjectIterator *it, Value *name, uint
 \qmlmethod bool Qt::isQtObject(object)
 Returns true if \c object is a valid reference to a Qt or QML object, otherwise false.
 */
-void QtObject::method_isQtObject(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_isQtObject(const BuiltinFunction *, CallData *callData)
 {
-    if (callData->argc == 0)
+    if (callData->argc() == 0)
         RETURN_RESULT(QV4::Encode(false));
 
-    scope.result = QV4::Encode(callData->args[0].as<QV4::QObjectWrapper>() != 0);
+    return QV4::Encode(callData->args[0].as<QV4::QObjectWrapper>() != 0);
 }
 
 /*!
@@ -243,9 +242,10 @@ void QtObject::method_isQtObject(const BuiltinFunction *, Scope &scope, CallData
 Returns a color with the specified \c red, \c green, \c blue and \c alpha components.
 All components should be in the range 0-1 inclusive.
 */
-void QtObject::method_rgba(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_rgba(const BuiltinFunction *builtin, CallData *callData)
 {
-    int argCount = callData->argc;
+    QV4::Scope scope(builtin);
+    int argCount = callData->argc();
     if (argCount < 3 || argCount > 4)
         THROW_GENERIC_ERROR("Qt.rgba(): Invalid arguments");
 
@@ -263,7 +263,7 @@ void QtObject::method_rgba(const BuiltinFunction *, Scope &scope, CallData *call
     if (a < 0.0) a=0.0;
     if (a > 1.0) a=1.0;
 
-    scope.result = scope.engine->fromVariant(QQml_colorProvider()->fromRgbF(r, g, b, a));
+    return scope.engine->fromVariant(QQml_colorProvider()->fromRgbF(r, g, b, a));
 }
 
 /*!
@@ -272,9 +272,10 @@ void QtObject::method_rgba(const BuiltinFunction *, Scope &scope, CallData *call
 Returns a color with the specified \c hue, \c saturation, \c lightness and \c alpha components.
 All components should be in the range 0-1 inclusive.
 */
-void QtObject::method_hsla(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_hsla(const BuiltinFunction *b, CallData *callData)
 {
-    int argCount = callData->argc;
+    QV4::Scope scope(b);
+    int argCount = callData->argc();
     if (argCount < 3 || argCount > 4)
         THROW_GENERIC_ERROR("Qt.hsla(): Invalid arguments");
 
@@ -292,7 +293,7 @@ void QtObject::method_hsla(const BuiltinFunction *, Scope &scope, CallData *call
     if (a < 0.0) a=0.0;
     if (a > 1.0) a=1.0;
 
-    scope.result = scope.engine->fromVariant(QQml_colorProvider()->fromHslF(h, s, l, a));
+    return scope.engine->fromVariant(QQml_colorProvider()->fromHslF(h, s, l, a));
 }
 
 /*!
@@ -303,9 +304,10 @@ All components should be in the range 0-1 inclusive.
 
 \since 5.5
 */
-void QtObject::method_hsva(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_hsva(const BuiltinFunction *b, CallData *callData)
 {
-    int argCount = callData->argc;
+    QV4::Scope scope(b);
+    int argCount = callData->argc();
     if (argCount < 3 || argCount > 4)
         THROW_GENERIC_ERROR("Qt.hsva(): Invalid arguments");
 
@@ -319,7 +321,7 @@ void QtObject::method_hsva(const BuiltinFunction *, Scope &scope, CallData *call
     v = qBound(0.0, v, 1.0);
     a = qBound(0.0, a, 1.0);
 
-    scope.result = scope.engine->fromVariant(QQml_colorProvider()->fromHsvF(h, s, v, a));
+    return scope.engine->fromVariant(QQml_colorProvider()->fromHsvF(h, s, v, a));
 }
 
 /*!
@@ -330,9 +332,10 @@ may be either color values or string values.  If a string value is supplied it
 must be convertible to a color, as described for the \l{colorbasictypedocs}{color}
 basic type.
 */
-void QtObject::method_colorEqual(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_colorEqual(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 2)
+    QV4::Scope scope(b);
+    if (callData->argc() != 2)
         THROW_GENERIC_ERROR("Qt.colorEqual(): Invalid arguments");
 
     bool ok = false;
@@ -358,7 +361,7 @@ void QtObject::method_colorEqual(const BuiltinFunction *, Scope &scope, CallData
     }
 
     bool equal = (lhs == rhs);
-    scope.result = QV4::Encode(equal);
+    return QV4::Encode(equal);
 }
 
 /*!
@@ -368,9 +371,10 @@ Returns a \c rect with the top-left corner at \c x, \c y and the specified \c wi
 
 The returned object has \c x, \c y, \c width and \c height attributes with the given values.
 */
-void QtObject::method_rect(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_rect(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 4)
+    QV4::Scope scope(b);
+    if (callData->argc() != 4)
         THROW_GENERIC_ERROR("Qt.rect(): Invalid arguments");
 
     double x = callData->args[0].toNumber();
@@ -378,37 +382,39 @@ void QtObject::method_rect(const BuiltinFunction *, Scope &scope, CallData *call
     double w = callData->args[2].toNumber();
     double h = callData->args[3].toNumber();
 
-    scope.result = scope.engine->fromVariant(QVariant::fromValue(QRectF(x, y, w, h)));
+    return scope.engine->fromVariant(QVariant::fromValue(QRectF(x, y, w, h)));
 }
 
 /*!
 \qmlmethod point Qt::point(int x, int y)
 Returns a Point with the specified \c x and \c y coordinates.
 */
-void QtObject::method_point(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_point(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 2)
+    QV4::Scope scope(b);
+    if (callData->argc() != 2)
         THROW_GENERIC_ERROR("Qt.point(): Invalid arguments");
 
     double x = callData->args[0].toNumber();
     double y = callData->args[1].toNumber();
 
-    scope.result = scope.engine->fromVariant(QVariant::fromValue(QPointF(x, y)));
+    return scope.engine->fromVariant(QVariant::fromValue(QPointF(x, y)));
 }
 
 /*!
 \qmlmethod Qt::size(int width, int height)
 Returns a Size with the specified \c width and \c height.
 */
-void QtObject::method_size(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_size(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 2)
+    QV4::Scope scope(b);
+    if (callData->argc() != 2)
         THROW_GENERIC_ERROR("Qt.size(): Invalid arguments");
 
     double w = callData->args[0].toNumber();
     double h = callData->args[1].toNumber();
 
-    scope.result = scope.engine->fromVariant(QVariant::fromValue(QSizeF(w, h)));
+    return scope.engine->fromVariant(QVariant::fromValue(QSizeF(w, h)));
 }
 
 /*!
@@ -419,9 +425,10 @@ key-value pairs where valid keys are the \l{fontbasictypedocs}{font} type's
 subproperty names, and the values are valid values for each subproperty.
 Invalid keys will be ignored.
 */
-void QtObject::method_font(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_font(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1 || !callData->args[0].isObject())
+    QV4::Scope scope(b);
+    if (callData->argc() != 1 || !callData->args[0].isObject())
         THROW_GENERIC_ERROR("Qt.font(): Invalid arguments");
 
     QV4::ExecutionEngine *v4 = scope.engine;
@@ -429,7 +436,7 @@ void QtObject::method_font(const BuiltinFunction *, Scope &scope, CallData *call
     QVariant v = QQml_valueTypeProvider()->createVariantFromJsObject(QMetaType::QFont, QQmlV4Handle(callData->args[0]), v4, &ok);
     if (!ok)
         THROW_GENERIC_ERROR("Qt.font(): Invalid argument: no valid font subproperties specified");
-    scope.result = scope.engine->fromVariant(v);
+    return scope.engine->fromVariant(v);
 }
 
 
@@ -438,9 +445,10 @@ void QtObject::method_font(const BuiltinFunction *, Scope &scope, CallData *call
 \qmlmethod Qt::vector2d(real x, real y)
 Returns a Vector2D with the specified \c x and \c y.
 */
-void QtObject::method_vector2d(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_vector2d(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 2)
+    QV4::Scope scope(b);
+    if (callData->argc() != 2)
         THROW_GENERIC_ERROR("Qt.vector2d(): Invalid arguments");
 
     float xy[3]; // qvector2d uses float internally
@@ -448,16 +456,17 @@ void QtObject::method_vector2d(const BuiltinFunction *, Scope &scope, CallData *
     xy[1] = callData->args[1].toNumber();
 
     const void *params[] = { xy };
-    scope.result = scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QVector2D, 1, params));
+    return scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QVector2D, 1, params));
 }
 
 /*!
 \qmlmethod Qt::vector3d(real x, real y, real z)
 Returns a Vector3D with the specified \c x, \c y and \c z.
 */
-void QtObject::method_vector3d(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_vector3d(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 3)
+    QV4::Scope scope(b);
+    if (callData->argc() != 3)
         THROW_GENERIC_ERROR("Qt.vector3d(): Invalid arguments");
 
     float xyz[3]; // qvector3d uses float internally
@@ -466,16 +475,17 @@ void QtObject::method_vector3d(const BuiltinFunction *, Scope &scope, CallData *
     xyz[2] = callData->args[2].toNumber();
 
     const void *params[] = { xyz };
-    scope.result = scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QVector3D, 1, params));
+    return scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QVector3D, 1, params));
 }
 
 /*!
 \qmlmethod Qt::vector4d(real x, real y, real z, real w)
 Returns a Vector4D with the specified \c x, \c y, \c z and \c w.
 */
-void QtObject::method_vector4d(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_vector4d(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 4)
+    QV4::Scope scope(b);
+    if (callData->argc() != 4)
         THROW_GENERIC_ERROR("Qt.vector4d(): Invalid arguments");
 
     float xyzw[4]; // qvector4d uses float internally
@@ -485,16 +495,17 @@ void QtObject::method_vector4d(const BuiltinFunction *, Scope &scope, CallData *
     xyzw[3] = callData->args[3].toNumber();
 
     const void *params[] = { xyzw };
-    scope.result = scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QVector4D, 1, params));
+    return scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QVector4D, 1, params));
 }
 
 /*!
 \qmlmethod Qt::quaternion(real scalar, real x, real y, real z)
 Returns a Quaternion with the specified \c scalar, \c x, \c y, and \c z.
 */
-void QtObject::method_quaternion(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_quaternion(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 4)
+    QV4::Scope scope(b);
+    if (callData->argc() != 4)
         THROW_GENERIC_ERROR("Qt.quaternion(): Invalid arguments");
 
     qreal sxyz[4]; // qquaternion uses qreal internally
@@ -504,7 +515,7 @@ void QtObject::method_quaternion(const BuiltinFunction *, Scope &scope, CallData
     sxyz[3] = callData->args[3].toNumber();
 
     const void *params[] = { sxyz };
-    scope.result = scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QQuaternion, 1, params));
+    return scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QQuaternion, 1, params));
 }
 
 /*!
@@ -516,25 +527,23 @@ matrix values.
 Finally, the function may be called with no arguments and the resulting
 matrix will be the identity matrix.
 */
-void QtObject::method_matrix4x4(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_matrix4x4(const BuiltinFunction *b, CallData *callData)
 {
-    QV4::ExecutionEngine *v4 = scope.engine;
+    QV4::Scope scope(b);
 
-    if (callData->argc == 0) {
-        scope.result = scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QMatrix4x4, 0, nullptr));
-        return;
+    if (callData->argc() == 0) {
+        return scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QMatrix4x4, 0, nullptr));
     }
 
-    if (callData->argc == 1 && callData->args[0].isObject()) {
+    if (callData->argc() == 1 && callData->args[0].isObject()) {
         bool ok = false;
-        QVariant v = QQml_valueTypeProvider()->createVariantFromJsObject(QMetaType::QMatrix4x4, QQmlV4Handle(callData->args[0]), v4, &ok);
+        QVariant v = QQml_valueTypeProvider()->createVariantFromJsObject(QMetaType::QMatrix4x4, QQmlV4Handle(callData->args[0]), scope.engine, &ok);
         if (!ok)
             THROW_GENERIC_ERROR("Qt.matrix4x4(): Invalid argument: not a valid matrix4x4 values array");
-        scope.result = scope.engine->fromVariant(v);
-        return;
+        return scope.engine->fromVariant(v);
     }
 
-    if (callData->argc != 16)
+    if (callData->argc() != 16)
         THROW_GENERIC_ERROR("Qt.matrix4x4(): Invalid arguments");
 
     qreal vals[16]; // qmatrix4x4 uses qreal internally
@@ -556,7 +565,7 @@ void QtObject::method_matrix4x4(const BuiltinFunction *, Scope &scope, CallData
     vals[15] = callData->args[15].toNumber();
 
     const void *params[] = { vals };
-    scope.result = scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QMatrix4x4, 1, params));
+    return scope.engine->fromVariant(QQml_valueTypeProvider()->createValueType(QMetaType::QMatrix4x4, 1, params));
 }
 
 /*!
@@ -573,9 +582,10 @@ by factor and converts the color back to RGB.
 
 If \c factor is not supplied, returns a color 50% lighter than \c baseColor (factor 1.5).
 */
-void QtObject::method_lighter(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_lighter(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1 && callData->argc != 2)
+    QV4::Scope scope(b);
+    if (callData->argc() != 1 && callData->argc() != 2)
         THROW_GENERIC_ERROR("Qt.lighter(): Invalid arguments");
 
     QVariant v = scope.engine->toVariant(callData->args[0], -1);
@@ -583,19 +593,17 @@ void QtObject::method_lighter(const BuiltinFunction *, Scope &scope, CallData *c
         bool ok = false;
         v = QQmlStringConverters::colorFromString(v.toString(), &ok);
         if (!ok) {
-            scope.result = QV4::Encode::null();
-            return;
+            return QV4::Encode::null();
         }
     } else if (v.userType() != QVariant::Color) {
-        scope.result = QV4::Encode::null();
-        return;
+        return QV4::Encode::null();
     }
 
     qreal factor = 1.5;
-    if (callData->argc == 2)
+    if (callData->argc() == 2)
         factor = callData->args[1].toNumber();
 
-    scope.result = scope.engine->fromVariant(QQml_colorProvider()->lighter(v, factor));
+    return scope.engine->fromVariant(QQml_colorProvider()->lighter(v, factor));
 }
 
 /*!
@@ -613,9 +621,10 @@ by factor and converts the color back to RGB.
 
 If \c factor is not supplied, returns a color 50% darker than \c baseColor (factor 2.0).
 */
-void QtObject::method_darker(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_darker(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1 && callData->argc != 2)
+    QV4::Scope scope(b);
+    if (callData->argc() != 1 && callData->argc() != 2)
         THROW_GENERIC_ERROR("Qt.darker(): Invalid arguments");
 
     QVariant v = scope.engine->toVariant(callData->args[0], -1);
@@ -623,19 +632,17 @@ void QtObject::method_darker(const BuiltinFunction *, Scope &scope, CallData *ca
         bool ok = false;
         v = QQmlStringConverters::colorFromString(v.toString(), &ok);
         if (!ok) {
-            scope.result = QV4::Encode::null();
-            return;
+            return QV4::Encode::null();
         }
     } else if (v.userType() != QVariant::Color) {
-        scope.result = QV4::Encode::null();
-        return;
+        return QV4::Encode::null();
     }
 
     qreal factor = 2.0;
-    if (callData->argc == 2)
+    if (callData->argc() == 2)
         factor = callData->args[1].toNumber();
 
-    scope.result = scope.engine->fromVariant(QQml_colorProvider()->darker(v, factor));
+    return scope.engine->fromVariant(QQml_colorProvider()->darker(v, factor));
 }
 
 /*!
@@ -662,9 +669,10 @@ void QtObject::method_darker(const BuiltinFunction *, Scope &scope, CallData *ca
 
     Tint is most useful when a subtle change is intended to be conveyed due to some event; you can then use tinting to more effectively tune the visible color.
 */
-void QtObject::method_tint(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_tint(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 2)
+    QV4::Scope scope(b);
+    if (callData->argc() != 2)
         THROW_GENERIC_ERROR("Qt.tint(): Invalid arguments");
 
     // base color
@@ -673,12 +681,10 @@ void QtObject::method_tint(const BuiltinFunction *, Scope &scope, CallData *call
         bool ok = false;
         v1 = QQmlStringConverters::colorFromString(v1.toString(), &ok);
         if (!ok) {
-            scope.result = QV4::Encode::null();
-            return;
+            return QV4::Encode::null();
         }
     } else if (v1.userType() != QVariant::Color) {
-        scope.result = QV4::Encode::null();
-        return;
+        return QV4::Encode::null();
     }
 
     // tint color
@@ -687,15 +693,13 @@ void QtObject::method_tint(const BuiltinFunction *, Scope &scope, CallData *call
         bool ok = false;
         v2 = QQmlStringConverters::colorFromString(v2.toString(), &ok);
         if (!ok) {
-            scope.result = QV4::Encode::null();
-            return;
+            return QV4::Encode::null();
         }
     } else if (v2.userType() != QVariant::Color) {
-        scope.result = QV4::Encode::null();
-        return;
+        return QV4::Encode::null();
     }
 
-    scope.result = scope.engine->fromVariant(QQml_colorProvider()->tint(v1, v2));
+    return scope.engine->fromVariant(QQml_colorProvider()->tint(v1, v2));
 }
 
 /*!
@@ -714,15 +718,16 @@ If \a format is not specified, \a date is formatted using
 
 \sa Locale
 */
-void QtObject::method_formatDate(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_formatDate(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc < 1 || callData->argc > 2)
+    QV4::Scope scope(b);
+    if (callData->argc() < 1 || callData->argc() > 2)
         THROW_GENERIC_ERROR("Qt.formatDate(): Invalid arguments");
 
     Qt::DateFormat enumFormat = Qt::DefaultLocaleShortDate;
     QDate date = scope.engine->toVariant(callData->args[0], -1).toDateTime().date();
     QString formattedDate;
-    if (callData->argc == 2) {
+    if (callData->argc() == 2) {
         QV4::ScopedString s(scope, callData->args[1]);
         if (s) {
             QString format = s->toQString();
@@ -738,7 +743,7 @@ void QtObject::method_formatDate(const BuiltinFunction *, Scope &scope, CallData
          formattedDate = date.toString(enumFormat);
     }
 
-    scope.result = scope.engine->newString(formattedDate);
+    return Encode(scope.engine->newString(formattedDate));
 }
 
 /*!
@@ -756,9 +761,10 @@ If \a format is not specified, \a time is formatted using
 
 \sa Locale
 */
-void QtObject::method_formatTime(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_formatTime(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc < 1 || callData->argc > 2)
+    QV4::Scope scope(b);
+    if (callData->argc() < 1 || callData->argc() > 2)
         THROW_GENERIC_ERROR("Qt.formatTime(): Invalid arguments");
 
     QVariant argVariant = scope.engine->toVariant(callData->args[0], -1);
@@ -770,7 +776,7 @@ void QtObject::method_formatTime(const BuiltinFunction *, Scope &scope, CallData
 
     Qt::DateFormat enumFormat = Qt::DefaultLocaleShortDate;
     QString formattedTime;
-    if (callData->argc == 2) {
+    if (callData->argc() == 2) {
         QV4::ScopedString s(scope, callData->args[1]);
         if (s) {
             QString format = s->toQString();
@@ -786,7 +792,7 @@ void QtObject::method_formatTime(const BuiltinFunction *, Scope &scope, CallData
          formattedTime = time.toString(enumFormat);
     }
 
-    scope.result = scope.engine->newString(formattedTime);
+    return Encode(scope.engine->newString(formattedTime));
 }
 
 /*!
@@ -881,15 +887,16 @@ with the \a format values below to produce the following results:
 
     \sa Locale
 */
-void QtObject::method_formatDateTime(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_formatDateTime(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc < 1 || callData->argc > 2)
+    QV4::Scope scope(b);
+    if (callData->argc() < 1 || callData->argc() > 2)
         THROW_GENERIC_ERROR("Qt.formatDateTime(): Invalid arguments");
 
     Qt::DateFormat enumFormat = Qt::DefaultLocaleShortDate;
     QDateTime dt = scope.engine->toVariant(callData->args[0], -1).toDateTime();
     QString formattedDt;
-    if (callData->argc == 2) {
+    if (callData->argc() == 2) {
         QV4::ScopedString s(scope, callData->args[1]);
         if (s) {
             QString format = s->toQString();
@@ -905,7 +912,7 @@ void QtObject::method_formatDateTime(const BuiltinFunction *, Scope &scope, Call
          formattedDt = dt.toString(enumFormat);
     }
 
-    scope.result = scope.engine->newString(formattedDt);
+    return Encode(scope.engine->newString(formattedDt));
 }
 
 /*!
@@ -919,94 +926,97 @@ void QtObject::method_formatDateTime(const BuiltinFunction *, Scope &scope, Call
     still fail to launch or fail to open the requested URL. This result will not be reported back
     to the application.
 */
-void QtObject::method_openUrlExternally(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_openUrlExternally(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1) {
-        scope.result = QV4::Encode(false);
-        return;
+    QV4::Scope scope(b);
+    if (callData->argc() != 1) {
+        return QV4::Encode(false);
     }
 
-    method_resolvedUrl(b, scope, callData);
-    QUrl url(scope.result.toQStringNoThrow());
-    scope.result = scope.engine->fromVariant(QQml_guiProvider()->openUrlExternally(url));
+    ScopedValue result(scope, method_resolvedUrl(b, callData));
+    QUrl url(result->toQStringNoThrow());
+    return scope.engine->fromVariant(QQml_guiProvider()->openUrlExternally(url));
 }
 
 /*!
   \qmlmethod url Qt::resolvedUrl(url url)
   Returns \a url resolved relative to the URL of the caller.
 */
-void QtObject::method_resolvedUrl(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_resolvedUrl(const BuiltinFunction *b, CallData *callData)
 {
-    ExecutionEngine *v4 = scope.engine;
+    QV4::Scope scope(b);
 
-    QUrl url = v4->toVariant(callData->args[0], -1).toUrl();
-    QQmlEngine *e = v4->qmlEngine();
+    QUrl url = scope.engine->toVariant(callData->args[0], -1).toUrl();
+    QQmlEngine *e = scope.engine->qmlEngine();
     QQmlEnginePrivate *p = 0;
     if (e) p = QQmlEnginePrivate::get(e);
     if (p) {
-        QQmlContextData *ctxt = v4->callingQmlContext();
+        QQmlContextData *ctxt = scope.engine->callingQmlContext();
         if (ctxt)
-            scope.result = v4->newString(ctxt->resolvedUrl(url).toString());
+            return Encode(scope.engine->newString(ctxt->resolvedUrl(url).toString()));
         else
-            scope.result = v4->newString(url.toString());
-        return;
+            return Encode(scope.engine->newString(url.toString()));
     }
 
-    scope.result = v4->newString(e->baseUrl().resolved(url).toString());
+    return Encode(scope.engine->newString(e->baseUrl().resolved(url).toString()));
 }
 
 /*!
 \qmlmethod list<string> Qt::fontFamilies()
 Returns a list of the font families available to the application.
 */
-void QtObject::method_fontFamilies(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_fontFamilies(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 0)
+    QV4::Scope scope(b);
+    if (callData->argc() != 0)
         THROW_GENERIC_ERROR("Qt.fontFamilies(): Invalid arguments");
 
-    scope.result = scope.engine->fromVariant(QVariant(QQml_guiProvider()->fontFamilies()));
+    return scope.engine->fromVariant(QVariant(QQml_guiProvider()->fontFamilies()));
 }
 
 /*!
 \qmlmethod string Qt::md5(data)
 Returns a hex string of the md5 hash of \c data.
 */
-void QtObject::method_md5(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_md5(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1)
+    QV4::Scope scope(b);
+    if (callData->argc() != 1)
         THROW_GENERIC_ERROR("Qt.md5(): Invalid arguments");
 
     QByteArray data = callData->args[0].toQStringNoThrow().toUtf8();
     QByteArray result = QCryptographicHash::hash(data, QCryptographicHash::Md5);
-    scope.result = scope.engine->newString(QLatin1String(result.toHex()));
+    return Encode(scope.engine->newString(QLatin1String(result.toHex())));
 }
 
 /*!
 \qmlmethod string Qt::btoa(data)
 Binary to ASCII - this function returns a base64 encoding of \c data.
 */
-void QtObject::method_btoa(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_btoa(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1)
+    QV4::Scope scope(b);
+    if (callData->argc() != 1)
         THROW_GENERIC_ERROR("Qt.btoa(): Invalid arguments");
 
     QByteArray data = callData->args[0].toQStringNoThrow().toUtf8();
 
-    scope.result = scope.engine->newString(QLatin1String(data.toBase64()));
+    return Encode(scope.engine->newString(QLatin1String(data.toBase64())));
 }
 
 /*!
 \qmlmethod string Qt::atob(data)
 ASCII to binary - this function decodes the base64 encoded \a data string and returns it.
 */
-void QtObject::method_atob(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_atob(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1)
+    QV4::Scope scope(b);
+    if (callData->argc() != 1)
         THROW_GENERIC_ERROR("Qt.atob(): Invalid arguments");
 
     QByteArray data = callData->args[0].toQStringNoThrow().toLatin1();
 
-    scope.result = scope.engine->newString(QString::fromUtf8(QByteArray::fromBase64(data)));
+    return Encode(scope.engine->newString(QString::fromUtf8(QByteArray::fromBase64(data))));
 }
 
 /*!
@@ -1018,10 +1028,10 @@ QQmlEngine::quit() signal to the QCoreApplication::quit() slot.
 
 \sa exit()
 */
-void QtObject::method_quit(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue QtObject::method_quit(const BuiltinFunction *b, CallData *)
 {
-    QQmlEnginePrivate::get(scope.engine->qmlEngine())->sendQuit();
-    scope.result = Encode::undefined();
+    QQmlEnginePrivate::get(b->engine()->qmlEngine())->sendQuit();
+    return Encode::undefined();
 }
 
 /*!
@@ -1035,15 +1045,16 @@ void QtObject::method_quit(const BuiltinFunction *, Scope &scope, CallData *)
 
     \sa quit()
 */
-void QtObject::method_exit(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_exit(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1)
+    QV4::Scope scope(b);
+    if (callData->argc() != 1)
         THROW_GENERIC_ERROR("Qt.exit(): Invalid arguments");
 
     int retCode = callData->args[0].toNumber();
 
     QQmlEnginePrivate::get(scope.engine->qmlEngine())->sendExit(retCode);
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
 /*!
@@ -1070,9 +1081,10 @@ If this is the case, consider using \l{QtQml::Qt::createComponent()}{Qt.createCo
 
 See \l {Dynamic QML Object Creation from JavaScript} for more information on using this function.
 */
-void QtObject::method_createQmlObject(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_createQmlObject(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc < 2 || callData->argc > 3)
+    QV4::Scope scope(b);
+    if (callData->argc() < 2 || callData->argc() > 3)
         THROW_GENERIC_ERROR("Qt.createQmlObject(): Invalid arguments");
 
     struct Error {
@@ -1121,7 +1133,7 @@ void QtObject::method_createQmlObject(const BuiltinFunction *, Scope &scope, Cal
         RETURN_RESULT(Encode::null());
 
     QUrl url;
-    if (callData->argc > 2)
+    if (callData->argc() > 2)
         url = QUrl(callData->args[2].toQStringNoThrow());
     else
         url = QUrl(QLatin1String("inline"));
@@ -1174,13 +1186,12 @@ void QtObject::method_createQmlObject(const BuiltinFunction *, Scope &scope, Cal
 
     if (component.isError()) {
         ScopedValue v(scope, Error::create(scope.engine, component.errors()));
-        scope.result = scope.engine->throwError(v);
-        return;
+        return scope.engine->throwError(v);
     }
 
     Q_ASSERT(obj);
 
-    scope.result = QV4::QObjectWrapper::wrap(scope.engine, obj);
+    return QV4::QObjectWrapper::wrap(scope.engine, obj);
 }
 
 /*!
@@ -1227,9 +1238,10 @@ See \l {Dynamic QML Object Creation from JavaScript} for more information on usi
 To create a QML object from an arbitrary string of QML (instead of a file),
 use \l{QtQml::Qt::createQmlObject()}{Qt.createQmlObject()}.
 */
-void QtObject::method_createComponent(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_createComponent(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc < 1 || callData->argc > 3)
+    QV4::Scope scope(b);
+    if (callData->argc() < 1 || callData->argc() > 3)
         THROW_GENERIC_ERROR("Qt.createComponent(): Invalid arguments");
 
     QV8Engine *v8engine = scope.engine->v8Engine;
@@ -1249,8 +1261,8 @@ void QtObject::method_createComponent(const BuiltinFunction *, Scope &scope, Cal
     QObject *parentArg = 0;
 
     int consumedCount = 1;
-    if (callData->argc > 1) {
-        ScopedValue lastArg(scope, callData->args[callData->argc-1]);
+    if (callData->argc() > 1) {
+        ScopedValue lastArg(scope, callData->args[callData->argc()-1]);
 
         // The second argument could be the mode enum
         if (callData->args[1].isInteger()) {
@@ -1261,11 +1273,11 @@ void QtObject::method_createComponent(const BuiltinFunction *, Scope &scope, Cal
             consumedCount += 1;
         } else {
             // The second argument could be the parent only if there are exactly two args
-            if ((callData->argc != 2) || !(lastArg->isObject() || lastArg->isNull()))
+            if ((callData->argc() != 2) || !(lastArg->isObject() || lastArg->isNull()))
                 THROW_GENERIC_ERROR("Qt.createComponent(): Invalid arguments");
         }
 
-        if (consumedCount < callData->argc) {
+        if (consumedCount < callData->argc()) {
             if (lastArg->isObject()) {
                 Scoped<QObjectWrapper> qobjectWrapper(scope, lastArg);
                 if (qobjectWrapper)
@@ -1286,7 +1298,7 @@ void QtObject::method_createComponent(const BuiltinFunction *, Scope &scope, Cal
     QQmlData::get(c, true)->explicitIndestructibleSet = false;
     QQmlData::get(c)->indestructible = false;
 
-    scope.result = QV4::QObjectWrapper::wrap(scope.engine, c);
+    return QV4::QObjectWrapper::wrap(scope.engine, c);
 }
 
 /*!
@@ -1309,18 +1321,19 @@ void QtObject::method_createComponent(const BuiltinFunction *, Scope &scope, Cal
 
     \sa Locale
 */
-void QtObject::method_locale(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_locale(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     QString code;
-    if (callData->argc > 1)
+    if (callData->argc() > 1)
         THROW_GENERIC_ERROR("locale() requires 0 or 1 argument");
-    if (callData->argc == 1 && !callData->args[0].isString())
+    if (callData->argc() == 1 && !callData->args[0].isString())
         THROW_TYPE_ERROR_WITH_MESSAGE("locale(): argument (locale code) must be a string");
 
-    if (callData->argc == 1)
+    if (callData->argc() == 1)
         code = callData->args[0].toQStringNoThrow();
 
-    scope.result = QQmlLocale::locale(scope.engine, code);
+    return QQmlLocale::locale(scope.engine, code);
 }
 
 void Heap::QQmlBindingFunction::init(const QV4::FunctionObject *originalFunction)
@@ -1332,8 +1345,8 @@ void Heap::QQmlBindingFunction::init(const QV4::FunctionObject *originalFunction
 
 QQmlSourceLocation QQmlBindingFunction::currentLocation() const
 {
-    QV4::StackFrame frame = engine()->currentStackFrame();
-    return QQmlSourceLocation(frame.source, frame.line, 0);
+    QV4::CppStackFrame *frame = engine()->currentStackFrame;
+    return QQmlSourceLocation(frame->source(), frame->lineNumber(), 0);
 }
 
 DEFINE_OBJECT_VTABLE(QQmlBindingFunction);
@@ -1382,20 +1395,22 @@ DEFINE_OBJECT_VTABLE(QQmlBindingFunction);
 
     \since 5.0
 */
-void QtObject::method_binding(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_binding(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1)
+    QV4::Scope scope(b);
+    if (callData->argc() != 1)
         THROW_GENERIC_ERROR("binding() requires 1 argument");
     const QV4::FunctionObject *f = callData->args[0].as<FunctionObject>();
     if (!f)
         THROW_TYPE_ERROR_WITH_MESSAGE("binding(): argument (binding expression) must be a function");
 
-    scope.result = scope.engine->memoryManager->allocObject<QQmlBindingFunction>(f);
+    return Encode(scope.engine->memoryManager->allocObject<QQmlBindingFunction>(f));
 }
 
 
-void QtObject::method_get_platform(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_get_platform(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     // ### inefficient. Should be just a value based getter
     Object *o = callData->thisObject.as<Object>();
     if (!o)
@@ -1408,11 +1423,12 @@ void QtObject::method_get_platform(const BuiltinFunction *, Scope &scope, CallDa
         // Only allocate a platform object once
         qt->d()->platform = new QQmlPlatform(scope.engine->jsEngine());
 
-    scope.result = QV4::QObjectWrapper::wrap(scope.engine, qt->d()->platform);
+    return QV4::QObjectWrapper::wrap(scope.engine, qt->d()->platform);
 }
 
-void QtObject::method_get_application(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_get_application(const BuiltinFunction *b, CallData *callData)
 {
+    QV4::Scope scope(b);
     // ### inefficient. Should be just a value based getter
     Object *o = callData->thisObject.as<Object>();
     if (!o)
@@ -1425,19 +1441,19 @@ void QtObject::method_get_application(const BuiltinFunction *, Scope &scope, Cal
         // Only allocate an application object once
         qt->d()->application = QQml_guiProvider()->application(scope.engine->jsEngine());
 
-    scope.result = QV4::QObjectWrapper::wrap(scope.engine, qt->d()->application);
+    return QV4::QObjectWrapper::wrap(scope.engine, qt->d()->application);
 }
 
-void QtObject::method_get_inputMethod(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue QtObject::method_get_inputMethod(const BuiltinFunction *b, CallData *)
 {
     QObject *o = QQml_guiProvider()->inputMethod();
-    scope.result = QV4::QObjectWrapper::wrap(scope.engine, o);
+    return QV4::QObjectWrapper::wrap(b->engine(), o);
 }
 
-void QtObject::method_get_styleHints(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue QtObject::method_get_styleHints(const BuiltinFunction *b, CallData *)
 {
     QObject *o = QQml_guiProvider()->styleHints();
-    scope.result = QV4::QObjectWrapper::wrap(scope.engine, o);
+    return QV4::QObjectWrapper::wrap(b->engine(), o);
 }
 
 
@@ -1497,15 +1513,16 @@ static QString jsStack(QV4::ExecutionEngine *engine) {
     return stack;
 }
 
-static void writeToConsole(const BuiltinFunction *, Scope &scope, CallData *callData,
-                                         ConsoleLogTypes logType, bool printStack = false)
+static ReturnedValue writeToConsole(const BuiltinFunction *b, CallData *callData,
+                                    ConsoleLogTypes logType, bool printStack = false)
 {
     QLoggingCategory *loggingCategory = 0;
     QString result;
+    QV4::Scope scope(b);
     QV4::ExecutionEngine *v4 = scope.engine;
 
     int start = 0;
-    if (callData->argc > 0) {
+    if (callData->argc() > 0) {
         if (const QObjectWrapper* wrapper = callData->args[0].as<QObjectWrapper>()) {
             if (QQmlLoggingCategory* category = qobject_cast<QQmlLoggingCategory*>(wrapper->object())) {
                 if (category->category())
@@ -1518,7 +1535,7 @@ static void writeToConsole(const BuiltinFunction *, Scope &scope, CallData *call
     }
 
 
-    for (int i = start; i < callData->argc; ++i) {
+    for (int i = start, ei = callData->argc(); i < ei; ++i) {
         if (i != start)
             result.append(QLatin1Char(' '));
 
@@ -1536,10 +1553,10 @@ static void writeToConsole(const BuiltinFunction *, Scope &scope, CallData *call
 
     if (!loggingCategory)
         loggingCategory = v4->qmlEngine() ? &qmlLoggingCategory : &jsLoggingCategory;
-    QV4::StackFrame frame = v4->currentStackFrame();
-    const QByteArray baSource = frame.source.toUtf8();
-    const QByteArray baFunction = frame.function.toUtf8();
-    QMessageLogger logger(baSource.constData(), frame.line, baFunction.constData(), loggingCategory->categoryName());
+    QV4::CppStackFrame *frame = v4->currentStackFrame;
+    const QByteArray baSource = frame->source().toUtf8();
+    const QByteArray baFunction = frame->function().toUtf8();
+    QMessageLogger logger(baSource.constData(), frame->lineNumber(), baFunction.constData(), loggingCategory->categoryName());
 
     switch (logType) {
     case Log:
@@ -1562,37 +1579,38 @@ static void writeToConsole(const BuiltinFunction *, Scope &scope, CallData *call
         break;
     }
 
-    scope.result = QV4::Encode::undefined();
+    return Encode::undefined();
 }
 
 DEFINE_OBJECT_VTABLE(ConsoleObject);
 
-void ConsoleObject::method_error(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue ConsoleObject::method_error(const BuiltinFunction *b, CallData *callData)
 {
-    writeToConsole(b, scope, callData, Error);
+    return writeToConsole(b, callData, Error);
 }
 
-void ConsoleObject::method_log(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue ConsoleObject::method_log(const BuiltinFunction *b, CallData *callData)
 {
     //console.log
     //console.debug
     //print
-    writeToConsole(b, scope, callData, Log);
+    return writeToConsole(b, callData, Log);
 }
 
-void ConsoleObject::method_info(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue ConsoleObject::method_info(const BuiltinFunction *b, CallData *callData)
 {
-    writeToConsole(b, scope, callData, Info);
+    return writeToConsole(b, callData, Info);
 }
 
-void ConsoleObject::method_profile(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue ConsoleObject::method_profile(const BuiltinFunction *b, CallData *)
 {
+    QV4::Scope scope(b);
     QV4::ExecutionEngine *v4 = scope.engine;
 
-    QV4::StackFrame frame = v4->currentStackFrame();
-    const QByteArray baSource = frame.source.toUtf8();
-    const QByteArray baFunction = frame.function.toUtf8();
-    QMessageLogger logger(baSource.constData(), frame.line, baFunction.constData());
+    QV4::CppStackFrame *frame = v4->currentStackFrame;
+    const QByteArray baSource = frame->source().toUtf8();
+    const QByteArray baFunction = frame->function().toUtf8();
+    QMessageLogger logger(baSource.constData(), frame->lineNumber(), baFunction.constData());
     QQmlProfilerService *service = QQmlDebugConnector::service<QQmlProfilerService>();
     if (!service) {
         logger.warning("Cannot start profiling because debug service is disabled. Start with -qmljsdebugger=port:XXXXX.");
@@ -1601,17 +1619,18 @@ void ConsoleObject::method_profile(const BuiltinFunction *, Scope &scope, CallDa
         logger.debug("Profiling started.");
     }
 
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
-void ConsoleObject::method_profileEnd(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue ConsoleObject::method_profileEnd(const BuiltinFunction *b, CallData *)
 {
+    QV4::Scope scope(b);
     QV4::ExecutionEngine *v4 = scope.engine;
 
-    QV4::StackFrame frame = v4->currentStackFrame();
-    const QByteArray baSource = frame.source.toUtf8();
-    const QByteArray baFunction = frame.function.toUtf8();
-    QMessageLogger logger(baSource.constData(), frame.line, baFunction.constData());
+    QV4::CppStackFrame *frame = v4->currentStackFrame;
+    const QByteArray baSource = frame->source().toUtf8();
+    const QByteArray baFunction = frame->function().toUtf8();
+    QMessageLogger logger(baSource.constData(), frame->lineNumber(), baFunction.constData());
 
     QQmlProfilerService *service = QQmlDebugConnector::service<QQmlProfilerService>();
     if (!service) {
@@ -1621,24 +1640,26 @@ void ConsoleObject::method_profileEnd(const BuiltinFunction *, Scope &scope, Cal
         logger.debug("Profiling ended.");
     }
 
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
-void ConsoleObject::method_time(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ConsoleObject::method_time(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1)
+    QV4::Scope scope(b);
+    if (callData->argc() != 1)
         THROW_GENERIC_ERROR("console.time(): Invalid arguments");
 
     QV8Engine *v8engine = scope.engine->v8Engine;
 
     QString name = callData->args[0].toQStringNoThrow();
     v8engine->startTimer(name);
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
-void ConsoleObject::method_timeEnd(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ConsoleObject::method_timeEnd(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1)
+    QV4::Scope scope(b);
+    if (callData->argc() != 1)
         THROW_GENERIC_ERROR("console.timeEnd(): Invalid arguments");
 
     QV8Engine *v8engine = scope.engine->v8Engine;
@@ -1649,65 +1670,68 @@ void ConsoleObject::method_timeEnd(const BuiltinFunction *, Scope &scope, CallDa
     if (wasRunning) {
         qDebug("%s: %llims", qPrintable(name), elapsed);
     }
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
-void ConsoleObject::method_count(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ConsoleObject::method_count(const BuiltinFunction *b, CallData *callData)
 {
     // first argument: name to print. Ignore any additional arguments
     QString name;
-    if (callData->argc > 0)
+    if (callData->argc() > 0)
         name = callData->args[0].toQStringNoThrow();
 
+    Scope scope(b);
     QV4::ExecutionEngine *v4 = scope.engine;
     QV8Engine *v8engine = scope.engine->v8Engine;
 
-    QV4::StackFrame frame = v4->currentStackFrame();
+    QV4::CppStackFrame *frame = v4->currentStackFrame;
 
-    QString scriptName = frame.source;
+    QString scriptName = frame->source();
 
-    int value = v8engine->consoleCountHelper(scriptName, frame.line, frame.column);
+    int value = v8engine->consoleCountHelper(scriptName, frame->lineNumber(), -1);
     QString message = name + QLatin1String(": ") + QString::number(value);
 
-    QMessageLogger(qPrintable(scriptName), frame.line,
-                   qPrintable(frame.function))
+    QMessageLogger(qPrintable(scriptName), frame->lineNumber(),
+                   qPrintable(frame->function()))
         .debug("%s", qPrintable(message));
 
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
-void ConsoleObject::method_trace(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ConsoleObject::method_trace(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 0)
+    QV4::Scope scope(b);
+    if (callData->argc() != 0)
         THROW_GENERIC_ERROR("console.trace(): Invalid arguments");
 
     QV4::ExecutionEngine *v4 = scope.engine;
 
     QString stack = jsStack(v4);
 
-    QV4::StackFrame frame = v4->currentStackFrame();
-    QMessageLogger(frame.source.toUtf8().constData(), frame.line,
-                   frame.function.toUtf8().constData())
+    QV4::CppStackFrame *frame = v4->currentStackFrame;
+    QMessageLogger(frame->source().toUtf8().constData(), frame->lineNumber(),
+                   frame->function().toUtf8().constData())
         .debug("%s", qPrintable(stack));
 
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
-void ConsoleObject::method_warn(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue ConsoleObject::method_warn(const BuiltinFunction *b, CallData *callData)
 {
-    return writeToConsole(b, scope, callData, Warn);
+    return writeToConsole(b, callData, Warn);
 }
 
-void ConsoleObject::method_assert(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue ConsoleObject::method_assert(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc == 0)
+    QV4::Scope scope(b);
+    if (callData->argc() == 0)
         THROW_GENERIC_ERROR("console.assert(): Missing argument");
 
     QV4::ExecutionEngine *v4 = scope.engine;
 
     if (!callData->args[0].toBoolean()) {
         QString message;
-        for (int i = 1; i < callData->argc; ++i) {
+        for (int i = 1, ei = callData->argc(); i < ei; ++i) {
             if (i != 1)
                 message.append(QLatin1Char(' '));
 
@@ -1716,23 +1740,22 @@ void ConsoleObject::method_assert(const BuiltinFunction *, Scope &scope, CallDat
 
         QString stack = jsStack(v4);
 
-        QV4::StackFrame frame = v4->currentStackFrame();
-        QMessageLogger(frame.source.toUtf8().constData(), frame.line,
-                       frame.function.toUtf8().constData())
+        QV4::CppStackFrame *frame = v4->currentStackFrame;
+        QMessageLogger(frame->source().toUtf8().constData(), frame->lineNumber(),
+                       frame->function().toUtf8().constData())
             .critical("%s\n%s",qPrintable(message), qPrintable(stack));
 
     }
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
-void ConsoleObject::method_exception(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue ConsoleObject::method_exception(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc == 0)
+    QV4::Scope scope(b);
+    if (callData->argc() == 0)
         THROW_GENERIC_ERROR("console.exception(): Missing argument");
 
-    writeToConsole(b, scope, callData, Error, true);
-
-    scope.result = QV4::Encode::undefined();
+    return writeToConsole(b, callData, Error, true);
 }
 
 
@@ -1788,30 +1811,31 @@ void QV4::GlobalExtensions::init(Object *globalObject, QJSEngine::Extensions ext
 
     \sa {Internationalization and Localization with Qt Quick}
 */
-void GlobalExtensions::method_qsTranslate(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalExtensions::method_qsTranslate(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc < 2)
+    QV4::Scope scope(b);
+    if (callData->argc() < 2)
         THROW_GENERIC_ERROR("qsTranslate() requires at least two arguments");
     if (!callData->args[0].isString())
         THROW_GENERIC_ERROR("qsTranslate(): first argument (context) must be a string");
     if (!callData->args[1].isString())
         THROW_GENERIC_ERROR("qsTranslate(): second argument (sourceText) must be a string");
-    if ((callData->argc > 2) && !callData->args[2].isString())
+    if ((callData->argc() > 2) && !callData->args[2].isString())
         THROW_GENERIC_ERROR("qsTranslate(): third argument (disambiguation) must be a string");
 
     QString context = callData->args[0].toQStringNoThrow();
     QString text = callData->args[1].toQStringNoThrow();
     QString comment;
-    if (callData->argc > 2) comment = callData->args[2].toQStringNoThrow();
+    if (callData->argc() > 2) comment = callData->args[2].toQStringNoThrow();
 
     int i = 3;
-    if (callData->argc > i && callData->args[i].isString()) {
+    if (callData->argc() > i && callData->args[i].isString()) {
         qWarning("qsTranslate(): specifying the encoding as fourth argument is deprecated");
         ++i;
     }
 
     int n = -1;
-    if (callData->argc > i)
+    if (callData->argc() > i)
         n = callData->args[i].toInt32();
 
     QString result = QCoreApplication::translate(context.toUtf8().constData(),
@@ -1819,7 +1843,7 @@ void GlobalExtensions::method_qsTranslate(const BuiltinFunction *, Scope &scope,
                                                  comment.toUtf8().constData(),
                                                  n);
 
-    scope.result = scope.engine->newString(result);
+    return Encode(scope.engine->newString(result));
 }
 
 /*!
@@ -1844,12 +1868,13 @@ void GlobalExtensions::method_qsTranslate(const BuiltinFunction *, Scope &scope,
 
     \sa {Internationalization and Localization with Qt Quick}
 */
-void GlobalExtensions::method_qsTranslateNoOp(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalExtensions::method_qsTranslateNoOp(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc < 2)
-        scope.result = QV4::Encode::undefined();
+    QV4::Scope scope(b);
+    if (callData->argc() < 2)
+        return QV4::Encode::undefined();
     else
-        scope.result = callData->args[1];
+        return callData->args[1].asReturnedValue();
 }
 
 /*!
@@ -1869,15 +1894,16 @@ void GlobalExtensions::method_qsTranslateNoOp(const BuiltinFunction *, Scope &sc
 
     \sa {Internationalization and Localization with Qt Quick}
 */
-void GlobalExtensions::method_qsTr(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalExtensions::method_qsTr(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc < 1)
+    QV4::Scope scope(b);
+    if (callData->argc() < 1)
         THROW_GENERIC_ERROR("qsTr() requires at least one argument");
     if (!callData->args[0].isString())
         THROW_GENERIC_ERROR("qsTr(): first argument (sourceText) must be a string");
-    if ((callData->argc > 1) && !callData->args[1].isString())
+    if ((callData->argc() > 1) && !callData->args[1].isString())
         THROW_GENERIC_ERROR("qsTr(): second argument (disambiguation) must be a string");
-    if ((callData->argc > 2) && !callData->args[2].isNumber())
+    if ((callData->argc() > 2) && !callData->args[2].isNumber())
         THROW_GENERIC_ERROR("qsTr(): third argument (n) must be a number");
 
     QString context;
@@ -1888,10 +1914,10 @@ void GlobalExtensions::method_qsTr(const BuiltinFunction *, Scope &scope, CallDa
         int length = lastDot - (lastSlash + 1);
         context = (lastSlash > -1) ? path.mid(lastSlash + 1, (length > -1) ? length : -1) : QString();
     } else {
-        ExecutionContext *parentCtx = scope.engine->currentContext;
+        CppStackFrame *frame = scope.engine->currentStackFrame;
         // The first non-empty source URL in the call stack determines the translation context.
-        while (!!parentCtx && context.isEmpty()) {
-            if (CompiledData::CompilationUnit *unit = static_cast<CompiledData::CompilationUnit*>(parentCtx->d()->compilationUnit)) {
+        while (frame && context.isEmpty()) {
+            if (CompiledData::CompilationUnit *unit = frame->v4Function->compilationUnit) {
                 QString fileName = unit->fileName();
                 QUrl url(unit->fileName());
                 if (url.isValid() && url.isRelative()) {
@@ -1903,22 +1929,22 @@ void GlobalExtensions::method_qsTr(const BuiltinFunction *, Scope &scope, CallDa
                 }
                 context = QFileInfo(context).baseName();
             }
-            parentCtx = scope.engine->parentContext(parentCtx);
+            frame = frame->parent;
         }
     }
 
     QString text = callData->args[0].toQStringNoThrow();
     QString comment;
-    if (callData->argc > 1)
+    if (callData->argc() > 1)
         comment = callData->args[1].toQStringNoThrow();
     int n = -1;
-    if (callData->argc > 2)
+    if (callData->argc() > 2)
         n = callData->args[2].toInt32();
 
     QString result = QCoreApplication::translate(context.toUtf8().constData(), text.toUtf8().constData(),
                                                  comment.toUtf8().constData(), n);
 
-    scope.result = scope.engine->newString(result);
+    return Encode(scope.engine->newString(result));
 }
 
 /*!
@@ -1943,12 +1969,12 @@ void GlobalExtensions::method_qsTr(const BuiltinFunction *, Scope &scope, CallDa
 
     \sa {Internationalization and Localization with Qt Quick}
 */
-void GlobalExtensions::method_qsTrNoOp(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalExtensions::method_qsTrNoOp(const BuiltinFunction *, CallData *callData)
 {
-    if (callData->argc < 1)
-        scope.result = QV4::Encode::undefined();
+    if (callData->argc() < 1)
+        return QV4::Encode::undefined();
     else
-        scope.result = callData->args[0];
+        return callData->args[0].asReturnedValue();
 }
 
 /*!
@@ -1981,20 +2007,21 @@ void GlobalExtensions::method_qsTrNoOp(const BuiltinFunction *, Scope &scope, Ca
 
     \sa QT_TRID_NOOP(), {Internationalization and Localization with Qt Quick}
 */
-void GlobalExtensions::method_qsTrId(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalExtensions::method_qsTrId(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc < 1)
+    QV4::Scope scope(b);
+    if (callData->argc() < 1)
         THROW_GENERIC_ERROR("qsTrId() requires at least one argument");
     if (!callData->args[0].isString())
         THROW_TYPE_ERROR_WITH_MESSAGE("qsTrId(): first argument (id) must be a string");
-    if (callData->argc > 1 && !callData->args[1].isNumber())
+    if (callData->argc() > 1 && !callData->args[1].isNumber())
         THROW_TYPE_ERROR_WITH_MESSAGE("qsTrId(): second argument (n) must be a number");
 
     int n = -1;
-    if (callData->argc > 1)
+    if (callData->argc() > 1)
         n = callData->args[1].toInt32();
 
-    scope.result = scope.engine->newString(qtTrId(callData->args[0].toQStringNoThrow().toUtf8().constData(), n));
+    return Encode(scope.engine->newString(qtTrId(callData->args[0].toQStringNoThrow().toUtf8().constData(), n)));
 }
 
 /*!
@@ -2013,28 +2040,29 @@ void GlobalExtensions::method_qsTrId(const BuiltinFunction *, Scope &scope, Call
 
     \sa qsTrId(), {Internationalization and Localization with Qt Quick}
 */
-void GlobalExtensions::method_qsTrIdNoOp(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalExtensions::method_qsTrIdNoOp(const BuiltinFunction *, CallData *callData)
 {
-    if (callData->argc < 1)
-        scope.result = QV4::Encode::undefined();
+    if (callData->argc() < 1)
+        return QV4::Encode::undefined();
     else
-        scope.result = callData->args[0];
+        return callData->args[0].asReturnedValue();
 }
 #endif // translation
 
 
-void GlobalExtensions::method_gc(const BuiltinFunction *, Scope &scope, CallData *)
+ReturnedValue GlobalExtensions::method_gc(const BuiltinFunction *b, CallData *)
 {
-    scope.engine->memoryManager->runGC();
+    b->engine()->memoryManager->runGC();
 
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
 
 
-void GlobalExtensions::method_string_arg(const BuiltinFunction *, Scope &scope, CallData *callData)
+ReturnedValue GlobalExtensions::method_string_arg(const BuiltinFunction *b, CallData *callData)
 {
-    if (callData->argc != 1)
+    QV4::Scope scope(b);
+    if (callData->argc() != 1)
         THROW_GENERIC_ERROR("String.arg(): Invalid arguments");
 
     QString value = callData->thisObject.toQString();
@@ -2070,10 +2098,10 @@ be passed on to the function invoked. Note that if redundant calls
 are eliminated, then only the last set of arguments will be passed to the
 function.
 */
-void QtObject::method_callLater(const BuiltinFunction *b, Scope &scope, CallData *callData)
+ReturnedValue QtObject::method_callLater(const BuiltinFunction *b, CallData *callData)
 {
-    QV8Engine *v8engine = scope.engine->v8Engine;
-    v8engine->delayedCallQueue()->addUniquelyAndExecuteLater(b, scope, callData);
+    QV8Engine *v8engine = b->engine()->v8Engine;
+    return v8engine->delayedCallQueue()->addUniquelyAndExecuteLater(b, callData);
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/qml/v8/qqmlbuiltinfunctions_p.h b/src/qml/qml/v8/qqmlbuiltinfunctions_p.h
index 21613b7c10..7d61aa0ada 100644
--- a/src/qml/qml/v8/qqmlbuiltinfunctions_p.h
+++ b/src/qml/qml/v8/qqmlbuiltinfunctions_p.h
@@ -93,45 +93,45 @@ struct QtObject : Object
     static ReturnedValue get(const Managed *m, String *name, bool *hasProperty);
     static void advanceIterator(Managed *m, ObjectIterator *it, Value *name, uint *index, Property *p, PropertyAttributes *attributes);
 
-    static void method_isQtObject(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_rgba(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_hsla(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_hsva(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_colorEqual(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_font(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_rect(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_point(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_size(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_vector2d(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_vector3d(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_vector4d(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_quaternion(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_matrix4x4(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_lighter(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_darker(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_tint(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_formatDate(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_formatTime(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_formatDateTime(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_openUrlExternally(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_fontFamilies(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_md5(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_btoa(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_atob(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_quit(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_exit(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_resolvedUrl(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_createQmlObject(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_createComponent(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_locale(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_binding(const BuiltinFunction *, Scope &scope, CallData *callData);
-
-    static void method_get_platform(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_application(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_inputMethod(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_get_styleHints(const BuiltinFunction *, Scope &scope, CallData *callData);
-
-    static void method_callLater(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_isQtObject(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_rgba(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_hsla(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_hsva(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_colorEqual(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_font(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_rect(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_point(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_size(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_vector2d(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_vector3d(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_vector4d(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_quaternion(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_matrix4x4(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_lighter(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_darker(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_tint(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_formatDate(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_formatTime(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_formatDateTime(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_openUrlExternally(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_fontFamilies(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_md5(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_btoa(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_atob(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_quit(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_exit(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_resolvedUrl(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_createQmlObject(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_createComponent(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_locale(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_binding(const BuiltinFunction *, CallData *callData);
+
+    static ReturnedValue method_get_platform(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_get_application(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_get_inputMethod(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_get_styleHints(const BuiltinFunction *, CallData *callData);
+
+    static ReturnedValue method_callLater(const BuiltinFunction *, CallData *callData);
 
 private:
     void addAll();
@@ -142,18 +142,18 @@ struct ConsoleObject : Object
 {
     V4_OBJECT2(ConsoleObject, Object)
 
-    static void method_error(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_log(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_info(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_profile(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_profileEnd(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_time(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_timeEnd(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_count(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_trace(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_warn(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_assert(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_exception(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_error(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_log(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_info(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_profile(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_profileEnd(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_time(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_timeEnd(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_count(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_trace(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_warn(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_assert(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_exception(const BuiltinFunction *, CallData *callData);
 
 };
 
@@ -161,17 +161,17 @@ struct Q_QML_PRIVATE_EXPORT GlobalExtensions {
     static void init(Object *globalObject, QJSEngine::Extensions extensions);
 
 #if QT_CONFIG(translation)
-    static void method_qsTranslate(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_qsTranslateNoOp(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_qsTr(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_qsTrNoOp(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_qsTrId(const BuiltinFunction *, Scope &scope, CallData *callData);
-    static void method_qsTrIdNoOp(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_qsTranslate(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_qsTranslateNoOp(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_qsTr(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_qsTrNoOp(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_qsTrId(const BuiltinFunction *, CallData *callData);
+    static ReturnedValue method_qsTrIdNoOp(const BuiltinFunction *, CallData *callData);
 #endif
-    static void method_gc(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_gc(const BuiltinFunction *, CallData *callData);
 
     // on String:prototype
-    static void method_string_arg(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static ReturnedValue method_string_arg(const BuiltinFunction *, CallData *callData);
 
 };
 
diff --git a/src/qml/qml/v8/qv4domerrors_p.h b/src/qml/qml/v8/qv4domerrors_p.h
index a9bdbe01ae..06a70a13e9 100644
--- a/src/qml/qml/v8/qv4domerrors_p.h
+++ b/src/qml/qml/v8/qv4domerrors_p.h
@@ -78,8 +78,7 @@ QT_BEGIN_NAMESPACE
     QV4::ScopedValue v(scope, scope.engine->newString(QStringLiteral(string))); \
     QV4::ScopedObject ex(scope, scope.engine->newErrorObject(v)); \
     ex->put(QV4::ScopedString(scope, scope.engine->newIdentifier(QStringLiteral("code"))), QV4::ScopedValue(scope, QV4::Primitive::fromInt32(error))); \
-    scope.result = scope.engine->throwError(ex); \
-    return; \
+    return scope.engine->throwError(ex); \
 }
 
 namespace QV4 {
diff --git a/src/qml/qml/v8/qv8engine_p.h b/src/qml/qml/v8/qv8engine_p.h
index 3bd3517968..a430fba0e6 100644
--- a/src/qml/qml/v8/qv8engine_p.h
+++ b/src/qml/qml/v8/qv8engine_p.h
@@ -116,8 +116,8 @@ namespace QV4 {
 class QQmlV4Function
 {
 public:
-    int length() const { return callData->argc; }
-    QV4::ReturnedValue operator[](int idx) const { return (idx < callData->argc ? callData->args[idx].asReturnedValue() : QV4::Encode::undefined()); }
+    int length() const { return callData->argc(); }
+    QV4::ReturnedValue operator[](int idx) const { return (idx < callData->argc() ? callData->args[idx].asReturnedValue() : QV4::Encode::undefined()); }
     void setReturnValue(QV4::ReturnedValue rv) { *retVal = rv; }
     QV4::ExecutionEngine *v4engine() const { return e; }
 private:
diff --git a/src/qml/types/qqmldelegatemodel.cpp b/src/qml/types/qqmldelegatemodel.cpp
index 4d2a9746c3..967f89971d 100644
--- a/src/qml/types/qqmldelegatemodel.cpp
+++ b/src/qml/types/qqmldelegatemodel.cpp
@@ -96,17 +96,16 @@ struct DelegateModelGroupFunction : QV4::FunctionObject
         return scope->engine()->memoryManager->allocObject<DelegateModelGroupFunction>(scope, flag, code);
     }
 
-    static void call(const QV4::Managed *that, QV4::Scope &scope, QV4::CallData *callData)
+    static ReturnedValue call(const QV4::FunctionObject *that, const Value *thisObject, const Value *argv, int argc)
     {
+        QV4::Scope scope(that->engine());
         QV4::Scoped<DelegateModelGroupFunction> f(scope, static_cast<const DelegateModelGroupFunction *>(that));
-        QV4::Scoped<QQmlDelegateModelItemObject> o(scope, callData->thisObject);
-        if (!o) {
-            scope.result = scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object"));
-            return;
-        }
+        QV4::Scoped<QQmlDelegateModelItemObject> o(scope, thisObject);
+        if (!o)
+            return scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object"));
 
-        QV4::ScopedValue v(scope, callData->argument(0));
-        scope.result = f->d()->code(o->d()->item, f->d()->flag, v);
+        QV4::ScopedValue v(scope, argc ? argv[0] : Primitive::undefinedValue());
+        return f->d()->code(o->d()->item, f->d()->flag, v);
     }
 };
 
@@ -1807,26 +1806,24 @@ int QQmlDelegateModelItemMetaType::parseGroups(const QV4::Value &groups) const
     return groupFlags;
 }
 
-void QQmlDelegateModelItem::get_model(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+QV4::ReturnedValue QQmlDelegateModelItem::get_model(const QV4::BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     QV4::Scoped<QQmlDelegateModelItemObject> o(scope, callData->thisObject.as<QQmlDelegateModelItemObject>());
-    if (!o) {
-        scope.result = scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object"));
-        return;
-    }
+    if (!o)
+        return b->engine()->throwTypeError(QStringLiteral("Not a valid VisualData object"));
     if (!o->d()->item->metaType->model)
         RETURN_UNDEFINED();
 
-    scope.result = o->d()->item->get();
+    return o->d()->item->get();
 }
 
-void QQmlDelegateModelItem::get_groups(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+QV4::ReturnedValue QQmlDelegateModelItem::get_groups(const QV4::BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     QV4::Scoped<QQmlDelegateModelItemObject> o(scope, callData->thisObject.as<QQmlDelegateModelItemObject>());
-    if (!o) {
-        scope.result = scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object"));
-        return;
-    }
+    if (!o)
+        return scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object"));
 
     QStringList groups;
     for (int i = 1; i < o->d()->item->metaType->groupCount; ++i) {
@@ -1834,18 +1831,17 @@ void QQmlDelegateModelItem::get_groups(const QV4::BuiltinFunction *, QV4::Scope
             groups.append(o->d()->item->metaType->groupNames.at(i - 1));
     }
 
-    scope.result = scope.engine->fromVariant(groups);
+    return scope.engine->fromVariant(groups);
 }
 
-void QQmlDelegateModelItem::set_groups(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+QV4::ReturnedValue QQmlDelegateModelItem::set_groups(const QV4::BuiltinFunction *b, QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     QV4::Scoped<QQmlDelegateModelItemObject> o(scope, callData->thisObject.as<QQmlDelegateModelItemObject>());
-    if (!o) {
-        scope.result = scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object"));
-        return;
-    }
+    if (!o)
+        return scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object"));
 
-    if (!callData->argc)
+    if (!callData->argc())
         THROW_TYPE_ERROR();
 
     if (!o->d()->item->metaType->model)
@@ -1856,7 +1852,7 @@ void QQmlDelegateModelItem::set_groups(const QV4::BuiltinFunction *, QV4::Scope
     const int cacheIndex = model->m_cache.indexOf(o->d()->item);
     Compositor::iterator it = model->m_compositor.find(Compositor::Cache, cacheIndex);
     model->setGroups(it, 1, Compositor::Cache, groupFlags);
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
 QV4::ReturnedValue QQmlDelegateModelItem::get_member(QQmlDelegateModelItem *thisItem, uint flag, const QV4::Value &)
@@ -3226,25 +3222,28 @@ struct QQmlDelegateModelGroupChange : QV4::Object
         return e->memoryManager->allocObject<QQmlDelegateModelGroupChange>();
     }
 
-    static void method_get_index(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData) {
+    static QV4::ReturnedValue method_get_index(const QV4::BuiltinFunction *b, QV4::CallData *callData) {
+        QV4::Scope scope(b);
         QV4::Scoped<QQmlDelegateModelGroupChange> that(scope, callData->thisObject.as<QQmlDelegateModelGroupChange>());
         if (!that)
             THROW_TYPE_ERROR();
-        scope.result = QV4::Encode(that->d()->change.index);
+        return QV4::Encode(that->d()->change.index);
     }
-    static void method_get_count(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData) {
+    static QV4::ReturnedValue method_get_count(const QV4::BuiltinFunction *b, QV4::CallData *callData) {
+        QV4::Scope scope(b);
         QV4::Scoped<QQmlDelegateModelGroupChange> that(scope, callData->thisObject.as<QQmlDelegateModelGroupChange>());
         if (!that)
             THROW_TYPE_ERROR();
-        scope.result = QV4::Encode(that->d()->change.count);
+        return QV4::Encode(that->d()->change.count);
     }
-    static void method_get_moveId(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData) {
+    static QV4::ReturnedValue method_get_moveId(const QV4::BuiltinFunction *b, QV4::CallData *callData) {
+        QV4::Scope scope(b);
         QV4::Scoped<QQmlDelegateModelGroupChange> that(scope, callData->thisObject.as<QQmlDelegateModelGroupChange>());
         if (!that)
             THROW_TYPE_ERROR();
         if (that->d()->change.moveId < 0)
             RETURN_UNDEFINED();
-        scope.result = QV4::Encode(that->d()->change.moveId);
+        return QV4::Encode(that->d()->change.moveId);
     }
 };
 
diff --git a/src/qml/types/qqmldelegatemodel_p_p.h b/src/qml/types/qqmldelegatemodel_p_p.h
index 3759fe8667..e0416e93ee 100644
--- a/src/qml/types/qqmldelegatemodel_p_p.h
+++ b/src/qml/types/qqmldelegatemodel_p_p.h
@@ -126,9 +126,9 @@ public:
     virtual void setValue(const QString &role, const QVariant &value) { Q_UNUSED(role); Q_UNUSED(value); }
     virtual bool resolveIndex(const QQmlAdaptorModel &, int) { return false; }
 
-    static void get_model(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void get_groups(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
-    static void set_groups(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static QV4::ReturnedValue get_model(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue get_groups(const QV4::BuiltinFunction *, QV4::CallData *callData);
+    static QV4::ReturnedValue set_groups(const QV4::BuiltinFunction *, QV4::CallData *callData);
     static QV4::ReturnedValue get_member(QQmlDelegateModelItem *thisItem, uint flag, const QV4::Value &);
     static QV4::ReturnedValue set_member(QQmlDelegateModelItem *thisItem, uint flag, const QV4::Value &arg);
     static QV4::ReturnedValue get_index(QQmlDelegateModelItem *thisItem, uint flag, const QV4::Value &arg);
diff --git a/src/qml/types/qqmllistmodel.cpp b/src/qml/types/qqmllistmodel.cpp
index c8f8a0fc70..e32e0c75f3 100644
--- a/src/qml/types/qqmllistmodel.cpp
+++ b/src/qml/types/qqmllistmodel.cpp
@@ -2591,14 +2591,10 @@ bool QQmlListModelParser::applyProperty(QV4::CompiledData::CompilationUnit *comp
                 QV4::ScopedContext context(scope, QV4::QmlContext::create(v4->rootContext(), QQmlContextData::get(qmlContext(model->m_modelCache)), nullptr));
                 QV4::ScopedFunctionObject function(scope, QV4::FunctionObject::createScriptFunction(context, compilationUnit->runtimeFunctions[id]));
 
-                // ### we need the inner function declaration (at this point the function has been wrapped)
-                const unsigned int parameterCount = function->formalParameterCount();
-                QV4::ScopedCallData callData(scope, parameterCount);
-                callData->thisObject = v4->globalObject;
-                function->call(scope, callData);
+                QV4::ReturnedValue result = function->call(v4->globalObject, nullptr, 0);
 
                 QJSValue v;
-                QJSValuePrivate::setValue(&v, v4, scope.result);
+                QJSValuePrivate::setValue(&v, v4, result);
                 value.setValue<QJSValue>(v);
             } else {
                 QByteArray script = scriptStr.toUtf8();
diff --git a/src/qml/types/qquickworkerscript.cpp b/src/qml/types/qquickworkerscript.cpp
index 6159355afc..346f2e6a61 100644
--- a/src/qml/types/qquickworkerscript.cpp
+++ b/src/qml/types/qquickworkerscript.cpp
@@ -65,6 +65,7 @@
 #include <private/qv4functionobject_p.h>
 #include <private/qv4script_p.h>
 #include <private/qv4scopedvalue_p.h>
+#include <private/qv4jscall_p.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -185,7 +186,7 @@ public:
 
     int m_nextId;
 
-    static void method_sendMessage(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData);
+    static QV4::ReturnedValue method_sendMessage(const QV4::BuiltinFunction *, QV4::CallData *callData);
 
 signals:
     void stopThread();
@@ -239,19 +240,18 @@ void QQuickWorkerScriptEnginePrivate::WorkerEngine::init()
 
     QV4::Scope scope(m_v4Engine);
     QV4::ExecutionContext *globalContext = scope.engine->rootContext();
-    onmessage.set(scope.engine, QV4::Script(globalContext, QString::fromUtf8(CALL_ONMESSAGE_SCRIPT)).run()); // do not use QStringLiteral here, MSVC2012 cannot apply this cleanly to the macro
+    onmessage.set(scope.engine, QV4::Script(globalContext, QV4::Compiler::GlobalCode, QString::fromUtf8(CALL_ONMESSAGE_SCRIPT)).run()); // do not use QStringLiteral here, MSVC2012 cannot apply this cleanly to the macro
     Q_ASSERT(!scope.engine->hasException);
-    QV4::Script createsendscript(globalContext, QString::fromUtf8(SEND_MESSAGE_CREATE_SCRIPT)); // do not use QStringLiteral here, MSVC2012 cannot apply this cleanly to the macro
+    QV4::Script createsendscript(globalContext, QV4::Compiler::GlobalCode, QString::fromUtf8(SEND_MESSAGE_CREATE_SCRIPT)); // do not use QStringLiteral here, MSVC2012 cannot apply this cleanly to the macro
     QV4::ScopedFunctionObject createsendconstructor(scope, createsendscript.run());
     Q_ASSERT(!scope.engine->hasException);
     QV4::ScopedString name(scope, m_v4Engine->newString(QStringLiteral("sendMessage")));
     QV4::ScopedValue function(scope, QV4::BuiltinFunction::create(globalContext, name,
-                                                                    QQuickWorkerScriptEnginePrivate::method_sendMessage));
-    QV4::ScopedCallData callData(scope, 1);
-    callData->args[0] = function;
-    callData->thisObject = global();
-    createsendconstructor->call(scope, callData);
-    createsend.set(scope.engine, scope.result.asReturnedValue());
+                                                                  QQuickWorkerScriptEnginePrivate::method_sendMessage));
+    QV4::JSCallData jsCallData(scope, 1);
+    jsCallData->args[0] = function;
+    *jsCallData->thisObject = global();
+    createsend.set(scope.engine, createsendconstructor->call(jsCallData));
 }
 
 // Requires handle and context scope
@@ -264,13 +264,14 @@ QV4::ReturnedValue QQuickWorkerScriptEnginePrivate::WorkerEngine::sendFunction(i
     QV4::Scope scope(v4);
     QV4::ScopedFunctionObject f(scope, createsend.value());
 
-    QV4::ScopedCallData callData(scope, 1);
-    callData->args[0] = QV4::Primitive::fromInt32(id);
-    callData->thisObject = global();
-    f->call(scope, callData);
+    QV4::ScopedValue v(scope);
+    QV4::JSCallData jsCallData(scope, 1);
+    jsCallData->args[0] = QV4::Primitive::fromInt32(id);
+    *jsCallData->thisObject = global();
+    v = f->call(jsCallData);
     if (scope.hasException())
-        scope.result = scope.engine->catchException();
-    return scope.result.asReturnedValue();
+        v = scope.engine->catchException();
+    return v->asReturnedValue();
 }
 
 #if QT_CONFIG(qml_network)
@@ -292,11 +293,13 @@ QQuickWorkerScriptEnginePrivate::QQuickWorkerScriptEnginePrivate(QQmlEngine *eng
 {
 }
 
-void QQuickWorkerScriptEnginePrivate::method_sendMessage(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+QV4::ReturnedValue QQuickWorkerScriptEnginePrivate::method_sendMessage(const QV4::BuiltinFunction *b,
+                                                                       QV4::CallData *callData)
 {
+    QV4::Scope scope(b);
     WorkerEngine *engine = (WorkerEngine*)scope.engine->v8Engine;
 
-    int id = callData->argc > 1 ? callData->args[1].toInt32() : 0;
+    int id = callData->argc() > 1 ? callData->args[1].toInt32() : 0;
 
     QV4::ScopedValue v(scope, callData->argument(2));
     QByteArray data = QV4::Serialize::serialize(v, scope.engine);
@@ -306,7 +309,7 @@ void QQuickWorkerScriptEnginePrivate::method_sendMessage(const QV4::BuiltinFunct
     if (script && script->owner)
         QCoreApplication::postEvent(script->owner, new WorkerDataEvent(0, data));
 
-    scope.result = QV4::Encode::undefined();
+    return QV4::Encode::undefined();
 }
 
 QV4::ReturnedValue QQuickWorkerScriptEnginePrivate::getWorker(WorkerScript *script)
@@ -363,11 +366,11 @@ void QQuickWorkerScriptEnginePrivate::processMessage(int id, const QByteArray &d
     QV4::Scoped<QV4::QmlContext> qmlContext(scope, script->qmlContext.value());
     Q_ASSERT(!!qmlContext);
 
-    QV4::ScopedCallData callData(scope, 2);
-    callData->thisObject = workerEngine->global();
-    callData->args[0] = qmlContext->d()->qml; // ###
-    callData->args[1] = value;
-    f->call(scope, callData);
+    QV4::JSCallData jsCallData(scope, 2);
+    *jsCallData->thisObject = workerEngine->global();
+    jsCallData->args[0] = qmlContext->d()->qml(); // ###
+    jsCallData->args[1] = value;
+    f->call(jsCallData);
     if (scope.hasException()) {
         QQmlError error = scope.engine->catchExceptionAsQmlError();
         reportScriptException(script, error);
diff --git a/src/qml/util/qqmladaptormodel.cpp b/src/qml/util/qqmladaptormodel.cpp
index 11fed281b7..d5b38f6d3e 100644
--- a/src/qml/util/qqmladaptormodel.cpp
+++ b/src/qml/util/qqmladaptormodel.cpp
@@ -61,8 +61,9 @@ public:
 
 V4_DEFINE_EXTENSION(QQmlAdaptorModelEngineData, engineData)
 
-static void get_index(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+static QV4::ReturnedValue get_index(const QV4::BuiltinFunction *f, QV4::CallData *callData)
 {
+    QV4::Scope scope(f);
     QV4::Scoped<QQmlDelegateModelItemObject> o(scope, callData->thisObject.as<QQmlDelegateModelItemObject>());
     if (!o)
         RETURN_RESULT(scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object")));
@@ -105,8 +106,8 @@ public:
     void setValue(const QString &role, const QVariant &value) override;
     bool resolveIndex(const QQmlAdaptorModel &model, int idx) override;
 
-    static QV4::ReturnedValue get_property(QV4::CallContext *ctx, uint propertyId);
-    static QV4::ReturnedValue set_property(QV4::CallContext *ctx, uint propertyId);
+    static QV4::ReturnedValue get_property(const QV4::BuiltinFunction *, QV4::CallData *);
+    static QV4::ReturnedValue set_property(const QV4::BuiltinFunction *, QV4::CallData *);
 
     VDMModelDelegateDataType *type;
     QVector<QVariant> cachedData;
@@ -194,8 +195,9 @@ public:
         dataType->watchedRoles += newRoles;
     }
 
-    static void get_hasModelChildren(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+    static QV4::ReturnedValue get_hasModelChildren(const QV4::BuiltinFunction *b, QV4::CallData *callData)
     {
+        QV4::Scope scope(b);
         QV4::Scoped<QQmlDelegateModelItemObject> o(scope, callData->thisObject.as<QQmlDelegateModelItemObject>());
         if (!o)
             RETURN_RESULT(scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object")));
@@ -341,12 +343,14 @@ bool QQmlDMCachedModelData::resolveIndex(const QQmlAdaptorModel &, int idx)
     }
 }
 
-QV4::ReturnedValue QQmlDMCachedModelData::get_property(QV4::CallContext *ctx, uint propertyId)
+QV4::ReturnedValue QQmlDMCachedModelData::get_property(const QV4::BuiltinFunction *b, QV4::CallData *callData)
 {
-    QV4::Scope scope(ctx);
-    QV4::Scoped<QQmlDelegateModelItemObject> o(scope, ctx->thisObject().as<QQmlDelegateModelItemObject>());
+    QV4::Scope scope(b);
+    QV4::Scoped<QQmlDelegateModelItemObject> o(scope, callData->thisObject.as<QQmlDelegateModelItemObject>());
     if (!o)
-        return ctx->engine()->throwTypeError(QStringLiteral("Not a valid VisualData object"));
+        return scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object"));
+
+    uint propertyId = static_cast<const QV4::IndexedBuiltinFunction *>(b)->d()->index;
 
     QQmlDMCachedModelData *modelData = static_cast<QQmlDMCachedModelData *>(o->d()->item);
     if (o->d()->item->index == -1) {
@@ -361,23 +365,25 @@ QV4::ReturnedValue QQmlDMCachedModelData::get_property(QV4::CallContext *ctx, ui
     return QV4::Encode::undefined();
 }
 
-QV4::ReturnedValue QQmlDMCachedModelData::set_property(QV4::CallContext *ctx, uint propertyId)
+QV4::ReturnedValue QQmlDMCachedModelData::set_property(const QV4::BuiltinFunction *b, QV4::CallData *callData)
 {
-    QV4::Scope scope(ctx);
-    QV4::Scoped<QQmlDelegateModelItemObject> o(scope, ctx->thisObject().as<QQmlDelegateModelItemObject>());
+    QV4::Scope scope(b);
+    QV4::Scoped<QQmlDelegateModelItemObject> o(scope, callData->thisObject.as<QQmlDelegateModelItemObject>());
     if (!o)
-        return ctx->engine()->throwTypeError(QStringLiteral("Not a valid VisualData object"));
-    if (!ctx->argc())
-        return ctx->engine()->throwTypeError();
+        return scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object"));
+    if (!callData->argc())
+        return scope.engine->throwTypeError();
+
+    uint propertyId = static_cast<const QV4::IndexedBuiltinFunction *>(b)->d()->index;
 
     if (o->d()->item->index == -1) {
         QQmlDMCachedModelData *modelData = static_cast<QQmlDMCachedModelData *>(o->d()->item);
         if (!modelData->cachedData.isEmpty()) {
             if (modelData->cachedData.count() > 1) {
-                modelData->cachedData[propertyId] = scope.engine->toVariant(ctx->args()[0], QVariant::Invalid);
+                modelData->cachedData[propertyId] = scope.engine->toVariant(callData->args[0], QVariant::Invalid);
                 QMetaObject::activate(o->d()->item, o->d()->item->metaObject(), propertyId, 0);
             } else if (modelData->cachedData.count() == 1) {
-                modelData->cachedData[0] = scope.engine->toVariant(ctx->args()[0], QVariant::Invalid);
+                modelData->cachedData[0] = scope.engine->toVariant(callData->args[0], QVariant::Invalid);
                 QMetaObject::activate(o->d()->item, o->d()->item->metaObject(), 0, 0);
                 QMetaObject::activate(o->d()->item, o->d()->item->metaObject(), 1, 0);
             }
@@ -580,25 +586,27 @@ public:
         }
     }
 
-    static void get_modelData(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+    static QV4::ReturnedValue get_modelData(const QV4::BuiltinFunction *b, QV4::CallData *callData)
     {
-        QV4::Scoped<QQmlDelegateModelItemObject> o(scope, callData->thisObject.as<QQmlDelegateModelItemObject>());
+        QV4::ExecutionEngine *v4 = b->engine();
+        QQmlDelegateModelItemObject *o = callData->thisObject.as<QQmlDelegateModelItemObject>();
         if (!o)
-            RETURN_RESULT(scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object")));
+            return v4->throwTypeError(QStringLiteral("Not a valid VisualData object"));
 
-        RETURN_RESULT(scope.engine->fromVariant(static_cast<QQmlDMListAccessorData *>(o->d()->item)->cachedData));
+        return v4->fromVariant(static_cast<QQmlDMListAccessorData *>(o->d()->item)->cachedData);
     }
 
-    static void set_modelData(const QV4::BuiltinFunction *, QV4::Scope &scope, QV4::CallData *callData)
+    static QV4::ReturnedValue set_modelData(const QV4::BuiltinFunction *b, QV4::CallData *callData)
     {
-        QV4::Scoped<QQmlDelegateModelItemObject> o(scope, callData->thisObject.as<QQmlDelegateModelItemObject>());
+        QV4::ExecutionEngine *v4 = b->engine();
+        QQmlDelegateModelItemObject *o = callData->thisObject.as<QQmlDelegateModelItemObject>();
         if (!o)
-            RETURN_RESULT(scope.engine->throwTypeError(QStringLiteral("Not a valid VisualData object")));
-        if (!callData->argc)
-            RETURN_RESULT(scope.engine->throwTypeError());
+            return v4->throwTypeError(QStringLiteral("Not a valid VisualData object"));
+        if (!callData->argc())
+            return v4->throwTypeError();
 
-        static_cast<QQmlDMListAccessorData *>(o->d()->item)->setModelData(scope.engine->toVariant(callData->args[0], QVariant::Invalid));
-        RETURN_RESULT(QV4::Encode::undefined());
+        static_cast<QQmlDMListAccessorData *>(o->d()->item)->setModelData(v4->toVariant(callData->args[0], QVariant::Invalid));
+        return QV4::Encode::undefined();
     }
 
     QV4::ReturnedValue get() override