Merge remote-tracking branch 'origin/5.9' into 5.10

 Conflicts:
	.qmake.conf
	src/qml/compiler/qv4codegen.cpp
	src/qml/compiler/qv4compileddata_p.h
	src/qml/debugger/qqmlprofiler_p.h
	src/qml/jsruntime/qv4engine.cpp
	src/qml/memory/qv4mm.cpp
	src/qml/qml/qqmlcomponent.cpp
	src/qml/qml/qqmlobjectcreator.cpp
	src/qml/qml/qqmlobjectcreator_p.h
	src/qml/types/qqmldelegatemodel.cpp
	src/quick/items/qquickitem_p.h
	src/quick/items/qquickwindow.cpp
	tests/auto/quick/touchmouse/BLACKLIST
	tests/benchmarks/qml/holistic/tst_holistic.cpp

Change-Id: I520f349ab4b048dd337d9647113564fc257865c2

41 files changed, 504 insertions, 377 deletions

diff --git a/src/qml/compiler/qqmlirbuilder.cpp b/src/qml/compiler/qqmlirbuilder.cpp
index 57121e5460..184925f167 100644
--- a/src/qml/compiler/qqmlirbuilder.cpp
+++ b/src/qml/compiler/qqmlirbuilder.cpp
@@ -1647,8 +1647,10 @@ 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,
-                     QQmlJS::AST::UiProgram *qmlRoot, QQmlTypeNameCache *imports, const QV4::Compiler::StringTableGenerator *stringPool)
+JSCodeGen::JSCodeGen(const QString &fileName, const QString &finalUrl, const QString &sourceCode,
+                     QV4::IR::Module *jsModule, QQmlJS::Engine *jsEngine,
+                     QQmlJS::AST::UiProgram *qmlRoot, QQmlTypeNameCache *imports,
+                     const QV4::Compiler::StringTableGenerator *stringPool, const QSet<QString> &globalNames)
     : QQmlJS::Codegen(/*strict mode*/false)
     , sourceCode(sourceCode)
     , jsEngine(jsEngine)
@@ -1660,9 +1662,11 @@ JSCodeGen::JSCodeGen(const QString &fileName, const QString &sourceCode, QV4::IR
     , _scopeObject(0)
     , _qmlContextTemp(-1)
     , _importedScriptsTemp(-1)
+    , m_globalNames(globalNames)
 {
     _module = jsModule;
     _module->setFileName(fileName);
+    _module->setFinalUrl(finalUrl);
     _fileNameIsUrl = true;
 }
 
@@ -2138,6 +2142,9 @@ QV4::IR::Expr *JSCodeGen::fallbackNameLookup(const QString &name, int line, int
         }
     }
 
+    if (m_globalNames.contains(name))
+        return _block->GLOBALNAME(name, line, col, /*forceLookup =*/ true);
+
 #else
     Q_UNUSED(name)
 #endif // V4_BOOTSTRAP
diff --git a/src/qml/compiler/qqmlirbuilder_p.h b/src/qml/compiler/qqmlirbuilder_p.h
index a5b4815745..f4d5901f92 100644
--- a/src/qml/compiler/qqmlirbuilder_p.h
+++ b/src/qml/compiler/qqmlirbuilder_p.h
@@ -608,9 +608,9 @@ struct Q_QML_EXPORT PropertyResolver
 
 struct Q_QML_PRIVATE_EXPORT JSCodeGen : public QQmlJS::Codegen
 {
-    JSCodeGen(const QString &fileName, const QString &sourceCode, QV4::IR::Module *jsModule,
-              QQmlJS::Engine *jsEngine, QQmlJS::AST::UiProgram *qmlRoot, QQmlTypeNameCache *imports,
-              const QV4::Compiler::StringTableGenerator *stringPool);
+    JSCodeGen(const QString &fileName, const QString &finalUrl, const QString &sourceCode,
+              QV4::IR::Module *jsModule, QQmlJS::Engine *jsEngine, QQmlJS::AST::UiProgram *qmlRoot,
+              QQmlTypeNameCache *imports, const QV4::Compiler::StringTableGenerator *stringPool, const QSet<QString> &globalNames);
 
     struct IdMapping
     {
@@ -645,6 +645,7 @@ private:
     QQmlPropertyCache *_scopeObject;
     int _qmlContextTemp;
     int _importedScriptsTemp;
+    QSet<QString> m_globalNames;
 };
 
 struct Q_QML_PRIVATE_EXPORT IRLoader {
diff --git a/src/qml/compiler/qqmltypecompiler.cpp b/src/qml/compiler/qqmltypecompiler.cpp
index 46f0c46b99..c502d410f1 100644
--- a/src/qml/compiler/qqmltypecompiler.cpp
+++ b/src/qml/compiler/qqmltypecompiler.cpp
@@ -140,7 +140,10 @@ QV4::CompiledData::CompilationUnit *QQmlTypeCompiler::compile()
             sss.scan();
         }
 
-        QmlIR::JSCodeGen v4CodeGenerator(typeData->finalUrlString(), document->code, &document->jsModule, &document->jsParserEngine, document->program, typeNameCache, &document->jsGenerator.stringTable);
+        QmlIR::JSCodeGen v4CodeGenerator(typeData->urlString(), typeData->finalUrlString(),
+                                         document->code, &document->jsModule,
+                                         &document->jsParserEngine, document->program,
+                                         typeNameCache, &document->jsGenerator.stringTable, engine->v8engine()->illegalNames());
         QQmlJSCodeGenerator jsCodeGen(this, &v4CodeGenerator);
         if (!jsCodeGen.generateCodeForComponents())
             return nullptr;
@@ -1100,7 +1103,11 @@ QQmlComponentAndAliasResolver::AliasResolutionResult QQmlComponentAndAliasResolv
             alias->flags |= QV4::CompiledData::Alias::AliasPointsToPointerObject;
         } else {
             QQmlPropertyCache *targetCache = propertyCaches.at(targetObjectIndex);
-            Q_ASSERT(targetCache);
+            if (!targetCache) {
+                *error = QQmlCompileError(alias->referenceLocation, tr("Invalid alias target location: %1").arg(property.toString()));
+                break;
+            }
+
             QmlIR::PropertyResolver resolver(targetCache);
 
             QQmlPropertyData *targetProperty = resolver.property(property.toString());
diff --git a/src/qml/compiler/qv4codegen.cpp b/src/qml/compiler/qv4codegen.cpp
index 5b7a7f9050..06f7cce2c7 100644
--- a/src/qml/compiler/qv4codegen.cpp
+++ b/src/qml/compiler/qv4codegen.cpp
@@ -501,6 +501,7 @@ Codegen::Codegen(bool strict)
 }
 
 void Codegen::generateFromProgram(const QString &fileName,
+                                  const QString &finalUrl,
                                   const QString &sourceCode,
                                   Program *node,
                                   QV4::IR::Module *module,
@@ -513,6 +514,7 @@ void Codegen::generateFromProgram(const QString &fileName,
     _variableEnvironment = 0;
 
     _module->setFileName(fileName);
+    _module->setFinalUrl(finalUrl);
 
     ScanFunctions scan(this, sourceCode, mode);
     scan(node);
@@ -523,12 +525,14 @@ void Codegen::generateFromProgram(const QString &fileName,
 }
 
 void Codegen::generateFromFunctionExpression(const QString &fileName,
+                                             const QString &finalUrl,
                                              const QString &sourceCode,
                                              AST::FunctionExpression *ast,
                                              QV4::IR::Module *module)
 {
     _module = module;
     _module->setFileName(fileName);
+    _module->setFinalUrl(finalUrl);
     _variableEnvironment = 0;
 
     ScanFunctions scan(this, sourceCode, GlobalCode);
diff --git a/src/qml/compiler/qv4codegen_p.h b/src/qml/compiler/qv4codegen_p.h
index 31e9cc0f46..f1066b88c5 100644
--- a/src/qml/compiler/qv4codegen_p.h
+++ b/src/qml/compiler/qv4codegen_p.h
@@ -86,15 +86,17 @@ public:
     };
 
     void generateFromProgram(const QString &fileName,
+                             const QString &finalUrl,
                              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);
+                                        const QString &finalUrl,
+                                        const QString &sourceCode,
+                                        AST::FunctionExpression *ast,
+                                        QV4::IR::Module *module);
 
 protected:
     enum Format { ex, cx, nx };
diff --git a/src/qml/compiler/qv4compileddata.cpp b/src/qml/compiler/qv4compileddata.cpp
index 292f5cde45..cacc3752ee 100644
--- a/src/qml/compiler/qv4compileddata.cpp
+++ b/src/qml/compiler/qv4compileddata.cpp
@@ -500,6 +500,7 @@ Unit *CompilationUnit::createUnitData(QmlIR::Document *irDocument)
     if (jsUnit->sourceFileIndex == quint32(0) || jsUnit->stringAt(jsUnit->sourceFileIndex) != irDocument->jsModule.fileName) {
         ensureWritableUnit();
         jsUnit->sourceFileIndex = stringTable.registerString(irDocument->jsModule.fileName);
+        jsUnit->finalUrlIndex = stringTable.registerString(irDocument->jsModule.finalUrl);
     }
 
     // Collect signals that have had a change in signature (from onClicked to onClicked(mouse) for example)
@@ -744,7 +745,7 @@ static QByteArray ownLibraryChecksum()
     // the cache files may end up being re-used. To avoid that we also add the checksum of
     // the QtQml library.
     Dl_info libInfo;
-    if (dladdr(reinterpret_cast<const void *>(&ownLibraryChecksum), &libInfo) != 0) {
+    if (dladdr(reinterpret_cast<void *>(&ownLibraryChecksum), &libInfo) != 0) {
         QFile library(QFile::decodeName(libInfo.dli_fname));
         if (library.open(QIODevice::ReadOnly)) {
             QCryptographicHash hash(QCryptographicHash::Md5);
diff --git a/src/qml/compiler/qv4compileddata_p.h b/src/qml/compiler/qv4compileddata_p.h
index adf6c21cc3..dc18a78681 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 0x14
 
 class QIODevice;
 class QQmlPropertyCache;
@@ -704,6 +704,7 @@ struct Unit
     quint32_le offsetToJSClassTable;
     qint32_le indexOfRootFunction;
     quint32_le sourceFileIndex;
+    quint32_le finalUrlIndex;
 
     /* QML specific fields */
     quint32_le nImports;
@@ -711,6 +712,8 @@ struct Unit
     quint32_le nObjects;
     quint32_le offsetToObjects;
 
+    quint32_le padding;
+
     const Import *importAt(int idx) const {
         return reinterpret_cast<const Import*>((reinterpret_cast<const char *>(this)) + offsetToImports + idx * sizeof(Import));
     }
@@ -775,7 +778,7 @@ struct Unit
     }
 };
 
-static_assert(sizeof(Unit) == 144, "Unit 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(Unit) == 152, "Unit structure needs to have the expected size to be binary compatible on disk when generated by host compiler and loaded by target");
 
 struct TypeReference
 {
@@ -885,14 +888,29 @@ struct Q_QML_PRIVATE_EXPORT CompilationUnit : public CompilationUnitBase, public
     ExecutionEngine *engine;
     QQmlEnginePrivate *qmlEngine; // only used in QML environment for composite types, not in plain QJSEngine case.
 
+    // url() and fileName() shall be used to load the actual QML/JS code or to show errors or
+    // warnings about that code. They include any potential URL interceptions and thus represent the
+    // "physical" location of the code.
+    //
+    // finalUrl() and finalUrlString() shall be used to resolve further URLs referred to in the code
+    // They are _not_ intercepted and thus represent the "logical" name for the code.
+
     QString fileName() const { return data->stringAt(data->sourceFileIndex); }
+    QString finalUrlString() const { return data->stringAt(data->finalUrlIndex); }
     QUrl url() const { if (m_url.isNull) m_url = QUrl(fileName()); return m_url; }
+    QUrl finalUrl() const
+    {
+        if (m_finalUrl.isNull)
+            m_finalUrl = QUrl(finalUrlString());
+        return m_finalUrl;
+    }
 
     QV4::Lookup *runtimeLookups;
     QV4::Value *runtimeRegularExpressions;
     QV4::InternalClass **runtimeClasses;
     QVector<QV4::Function *> runtimeFunctions;
     mutable QQmlNullableValue<QUrl> m_url;
+    mutable QQmlNullableValue<QUrl> m_finalUrl;
 
     // QML specific fields
     QQmlPropertyCacheVector propertyCaches;
diff --git a/src/qml/compiler/qv4compiler.cpp b/src/qml/compiler/qv4compiler.cpp
index f02ee728c9..fc03320a20 100644
--- a/src/qml/compiler/qv4compiler.cpp
+++ b/src/qml/compiler/qv4compiler.cpp
@@ -212,6 +212,7 @@ int QV4::Compiler::JSUnitGenerator::registerJSClass(int count, IR::ExprList *arg
 QV4::CompiledData::Unit *QV4::Compiler::JSUnitGenerator::generateUnit(GeneratorOption option)
 {
     registerString(irModule->fileName);
+    registerString(irModule->finalUrl);
     for (QV4::IR::Function *f : qAsConst(irModule->functions)) {
         registerString(*f->name);
         for (int i = 0; i < f->formals.size(); ++i)
@@ -429,6 +430,7 @@ QV4::CompiledData::Unit QV4::Compiler::JSUnitGenerator::generateHeader(QV4::Comp
     }
     unit.indexOfRootFunction = -1;
     unit.sourceFileIndex = getStringId(irModule->fileName);
+    unit.finalUrlIndex = getStringId(irModule->finalUrl);
     unit.sourceTimeStamp = irModule->sourceTimeStamp.isValid() ? irModule->sourceTimeStamp.toMSecsSinceEpoch() : 0;
     unit.nImports = 0;
     unit.offsetToImports = 0;
diff --git a/src/qml/compiler/qv4isel_moth.cpp b/src/qml/compiler/qv4isel_moth.cpp
index 82f5225f28..c29ffa10c2 100644
--- a/src/qml/compiler/qv4isel_moth.cpp
+++ b/src/qml/compiler/qv4isel_moth.cpp
@@ -386,7 +386,7 @@ void InstructionSelection::constructActivationProperty(IR::Name *func,
                                                        IR::ExprList *args,
                                                        IR::Expr *target)
 {
-    if (useFastLookups && func->global) {
+    if ((useFastLookups || func->forceLookup) && func->global) {
         Instruction::ConstructGlobalLookup call;
         call.index = registerGlobalGetterLookup(*func->id);
         prepareCallArgs(args, call.argc);
@@ -491,7 +491,7 @@ void InstructionSelection::loadRegexp(IR::RegExp *sourceRegexp, IR::Expr *target
 
 void InstructionSelection::getActivationProperty(const IR::Name *name, IR::Expr *target)
 {
-    if (useFastLookups && name->global) {
+    if ((useFastLookups || name->forceLookup) && name->global) {
         Instruction::GetGlobalLookup load;
         load.index = registerGlobalGetterLookup(*name->id);
         load.result = getResultParam(target);
@@ -1015,7 +1015,7 @@ void InstructionSelection::visitRet(IR::Ret *s)
 
 void InstructionSelection::callBuiltinInvalid(IR::Name *func, IR::ExprList *args, IR::Expr *result)
 {
-    if (useFastLookups && func->global) {
+    if ((useFastLookups || func->forceLookup) && func->global) {
         Instruction::CallGlobalLookup call;
         call.index = registerGlobalGetterLookup(*func->id);
         prepareCallArgs(args, call.argc);
diff --git a/src/qml/compiler/qv4jsir.cpp b/src/qml/compiler/qv4jsir.cpp
index 0b0ed391fb..a4038f827a 100644
--- a/src/qml/compiler/qv4jsir.cpp
+++ b/src/qml/compiler/qv4jsir.cpp
@@ -243,11 +243,12 @@ private:
     }
 };
 
-void Name::initGlobal(const QString *id, quint32 line, quint32 column)
+void Name::initGlobal(const QString *id, quint32 line, quint32 column, bool forceLookup)
 {
     this->id = id;
     this->builtin = builtin_invalid;
     this->global = true;
+    this->forceLookup = forceLookup;
     this->qmlSingleton = false;
     this->freeOfSideEffects = false;
     this->line = line;
@@ -259,6 +260,7 @@ void Name::init(const QString *id, quint32 line, quint32 column)
     this->id = id;
     this->builtin = builtin_invalid;
     this->global = false;
+    this->forceLookup = false;
     this->qmlSingleton = false;
     this->freeOfSideEffects = false;
     this->line = line;
@@ -270,6 +272,7 @@ void Name::init(Builtin builtin, quint32 line, quint32 column)
     this->id = 0;
     this->builtin = builtin;
     this->global = false;
+    this->forceLookup = false;
     this->qmlSingleton = false;
     this->freeOfSideEffects = false;
     this->line = line;
@@ -351,6 +354,11 @@ void Module::setFileName(const QString &name)
     fileName = name;
 }
 
+void Module::setFinalUrl(const QString &url)
+{
+    finalUrl = url;
+}
+
 Function::Function(Module *module, Function *outer, const QString &name)
     : module(module)
     , pool(&module->pool)
diff --git a/src/qml/compiler/qv4jsir_p.h b/src/qml/compiler/qv4jsir_p.h
index fb65eb4d8c..8c314a9635 100644
--- a/src/qml/compiler/qv4jsir_p.h
+++ b/src/qml/compiler/qv4jsir_p.h
@@ -480,6 +480,7 @@ struct Name: Expr {
     const QString *id;
     Builtin builtin;
     bool global : 1;
+    bool forceLookup : 1;
     bool qmlSingleton : 1;
     bool freeOfSideEffects : 1;
     quint32 line;
@@ -487,7 +488,7 @@ struct Name: Expr {
 
     Name(): Expr(NameExpr) {}
 
-    void initGlobal(const QString *id, quint32 line, quint32 column);
+    void initGlobal(const QString *id, quint32 line, quint32 column, bool forceLookup = false);
     void init(const QString *id, quint32 line, quint32 column);
     void init(Builtin builtin, quint32 line, quint32 column);
 
@@ -952,6 +953,7 @@ struct Q_QML_PRIVATE_EXPORT Module {
     QVector<Function *> functions;
     Function *rootFunction;
     QString fileName;
+    QString finalUrl;
     QDateTime sourceTimeStamp;
     bool isQmlModule; // implies rootFunction is always 0
     uint unitFlags; // flags merged into CompiledData::Unit::flags
@@ -977,6 +979,7 @@ struct Q_QML_PRIVATE_EXPORT Module {
     ~Module();
 
     void setFileName(const QString &name);
+    void setFinalUrl(const QString &url);
 };
 
 struct BasicBlock {
@@ -1139,7 +1142,7 @@ public:
     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);
+    Name *GLOBALNAME(const QString &id, quint32 line, quint32 column, bool forceLookup = false);
 
     Closure *CLOSURE(int functionInModule);
 
@@ -1607,11 +1610,11 @@ inline Name *BasicBlock::NAME(const QString &id, quint32 line, quint32 column)
     return e;
 }
 
-inline Name *BasicBlock::GLOBALNAME(const QString &id, quint32 line, quint32 column)
+inline Name *BasicBlock::GLOBALNAME(const QString &id, quint32 line, quint32 column, bool forceLookup)
 {
     Q_ASSERT(!isRemoved());
     Name *e = function->New<Name>();
-    e->initGlobal(function->newString(id), line, column);
+    e->initGlobal(function->newString(id), line, column, forceLookup);
     return e;
 }
 
diff --git a/src/qml/debugger/qqmlprofiler_p.h b/src/qml/debugger/qqmlprofiler_p.h
index 6dc9859295..f03657508e 100644
--- a/src/qml/debugger/qqmlprofiler_p.h
+++ b/src/qml/debugger/qqmlprofiler_p.h
@@ -234,9 +234,10 @@ public:
     {
         // Use the QV4::Function as ID, as that is common among different instances of the same
         // component. QQmlBinding is per instance.
-        // Add 1 to the ID, to make it different from the IDs the V4 profiler produces. The +1 makes
-        // the pointer point into the middle of the QV4::Function. Thus it still points to valid
-        // memory but we cannot accidentally create a duplicate key from another object.
+        // Add 1 to the ID, to make it different from the IDs the V4 and signal handling profilers
+        // produce. The +1 makes the pointer point into the middle of the QV4::Function. Thus it
+        // still points to valid memory but we cannot accidentally create a duplicate key from
+        // another object.
         // If there is no function, use a static but valid address: The profiler itself.
         quintptr locationId = function ? id(function) + 1 : id(this);
         m_data.append(QQmlProfilerData(m_timer.nsecsElapsed(),
@@ -268,7 +269,12 @@ public:
 
     void startHandlingSignal(QQmlBoundSignalExpression *expression)
     {
-        quintptr locationId(id(expression));
+        // Use the QV4::Function as ID, as that is common among different instances of the same
+        // component. QQmlBoundSignalExpression is per instance.
+        // Add 2 to the ID, to make it different from the IDs the V4 and binding profilers produce.
+        // The +2 makes the pointer point into the middle of the QV4::Function. Thus it still points
+        // to valid memory but we cannot accidentally create a duplicate key from another object.
+        quintptr locationId(id(expression->function()) + 2);
         m_data.append(QQmlProfilerData(m_timer.nsecsElapsed(),
                                        (1 << RangeStart | 1 << RangeLocation), HandlingSignal,
                                        locationId));
diff --git a/src/qml/doc/src/includes/qqmlcomponent.qdoc b/src/qml/doc/src/includes/qqmlcomponent.qdoc
new file mode 100644
index 0000000000..0eb60ed743
--- /dev/null
+++ b/src/qml/doc/src/includes/qqmlcomponent.qdoc
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [url-note]
+Ensure that the URL provided is full and correct, in particular, use
+\l QUrl::fromLocalFile() when loading a file from the local filesystem.
+
+Relative paths will be resolved against the engine's
+\l {QQmlEngine::baseUrl}{baseUrl()}, which is the current working directory
+unless specified.
+//! [url-note]
diff --git a/src/qml/doc/src/qmllanguageref/syntax/objectattributes.qdoc b/src/qml/doc/src/qmllanguageref/syntax/objectattributes.qdoc
index 207fb53ca0..31650db7c0 100644
--- a/src/qml/doc/src/qmllanguageref/syntax/objectattributes.qdoc
+++ b/src/qml/doc/src/qmllanguageref/syntax/objectattributes.qdoc
@@ -449,13 +449,38 @@ right-hand-side of the property declaration must be a valid alias reference:
 [default] property alias <name>: <alias reference>
 \endcode
 
-Unlike an ordinary property, an alias can only refer to an object, or the
-property of an object, that is within the scope of the \l{QML Object Types}
-{type} within which the alias is declared. It cannot contain arbitrary
-JavaScript expressions and it cannot refer to objects declared outside of
-the scope of its type. Also note the \e {alias reference} is not optional,
-unlike the optional default value for an ordinary property; the alias reference
-must be provided when the alias is first declared.
+Unlike an ordinary property, an alias has the following restrictions:
+
+\list
+\li It can only refer to an object, or the
+    property of an object, that is within the scope of the \l{QML Object Types}
+    {type} within which the alias is declared.
+\li It cannot contain arbitrary
+    JavaScript expressions
+\li It cannot refer to objects declared outside of
+    the scope of its type.
+\li The \e {alias reference} is not optional,
+    unlike the optional default value for an ordinary property; the alias reference
+    must be provided when the alias is first declared.
+\li It cannot refer to grouped properties; the following code will not work:
+    \code
+    property alias color: rectangle.border.color
+
+    Rectangle {
+        id: rectangle
+    }
+    \endcode
+
+    However, aliases to \l {QML Basic Types}{value type} properties do work:
+    \code
+    property alias rectX: object.rectProperty.x
+
+    Item {
+        id: object
+        property rect rectProperty
+    }
+    \endcode
+\endlist
 
 For example, below is a \c Button type with a \c buttonText aliased property
 which is connected to the \c text object of the \l Text child:
diff --git a/src/qml/jit/qv4isel_masm.cpp b/src/qml/jit/qv4isel_masm.cpp
index 7784eb364e..a35b12d51e 100644
--- a/src/qml/jit/qv4isel_masm.cpp
+++ b/src/qml/jit/qv4isel_masm.cpp
@@ -168,7 +168,7 @@ void InstructionSelection<JITAssembler>::callBuiltinInvalid(IR::Name *func, IR::
 {
     prepareCallData(args, 0);
 
-    if (useFastLookups && func->global) {
+    if ((useFastLookups || func->forceLookup) && func->global) {
         uint index = registerGlobalGetterLookup(*func->id);
         generateRuntimeCall(_as, result, callGlobalLookup,
                              JITTargetPlatform::EngineRegister,
@@ -520,7 +520,7 @@ void InstructionSelection<JITAssembler>::loadRegexp(IR::RegExp *sourceRegexp, IR
 template <typename JITAssembler>
 void InstructionSelection<JITAssembler>::getActivationProperty(const IR::Name *name, IR::Expr *target)
 {
-    if (useFastLookups && name->global) {
+    if ((useFastLookups || name->forceLookup) && name->global) {
         uint index = registerGlobalGetterLookup(*name->id);
         generateLookupCall(target, index, offsetof(QV4::Lookup, globalGetter), JITTargetPlatform::EngineRegister, JITAssembler::Void);
         return;
@@ -1136,7 +1136,7 @@ void InstructionSelection<JITAssembler>::constructActivationProperty(IR::Name *f
     Q_ASSERT(func != 0);
     prepareCallData(args, 0);
 
-    if (useFastLookups && func->global) {
+    if ((useFastLookups || func->forceLookup) && func->global) {
         uint index = registerGlobalGetterLookup(*func->id);
         generateRuntimeCall(_as, result, constructGlobalLookup,
                              JITTargetPlatform::EngineRegister,
diff --git a/src/qml/jsruntime/qv4engine.cpp b/src/qml/jsruntime/qv4engine.cpp
index 7b298a302c..f19f134c53 100644
--- a/src/qml/jsruntime/qv4engine.cpp
+++ b/src/qml/jsruntime/qv4engine.cpp
@@ -219,6 +219,7 @@ 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[EngineBase::Class_QmlContext] = internalClasses[EngineBase::Class_ExecutionContext]->changeVTable(QV4::QmlContext::staticVTable());
     internalClasses[Class_SimpleCallContext] = internalClasses[EngineBase::Class_Empty]->changeVTable(QV4::CallContext::staticVTable());
 
     jsStrings[String_Empty] = newIdentifier(QString());
@@ -261,6 +262,7 @@ ExecutionEngine::ExecutionEngine(EvalISelFactory *factory)
     InternalClass *ic = internalClasses[Class_Empty]->changeVTable(QV4::Object::staticVTable());
     jsObjects[ObjectProto] = memoryManager->allocObject<ObjectPrototype>(ic);
     internalClasses[Class_Object] = ic->changePrototype(objectPrototype()->d());
+    internalClasses[EngineBase::Class_QmlContextWrapper] = internalClasses[Class_Object]->changeVTable(QV4::QQmlContextWrapper::staticVTable());
 
     ic = newInternalClass(ArrayPrototype::staticVTable(), objectPrototype());
     Q_ASSERT(ic->prototype);
@@ -912,14 +914,14 @@ QUrl ExecutionEngine::resolvedUrl(const QString &file)
     while (c) {
         SimpleCallContext *callCtx = c->asSimpleCallContext();
         if (callCtx && callCtx->d()->v4Function) {
-            base.setUrl(callCtx->d()->v4Function->sourceFile());
+            base = callCtx->d()->v4Function->finalUrl();
             break;
         }
         c = parentContext(c);
     }
 
     if (base.isEmpty() && globalCode)
-        base.setUrl(globalCode->sourceFile());
+        base = globalCode->finalUrl();
 
     if (base.isEmpty())
         return src;
diff --git a/src/qml/jsruntime/qv4enginebase_p.h b/src/qml/jsruntime/qv4enginebase_p.h
index 88f9dfd85c..8258d644ff 100644
--- a/src/qml/jsruntime/qv4enginebase_p.h
+++ b/src/qml/jsruntime/qv4enginebase_p.h
@@ -106,6 +106,8 @@ struct EngineBase {
         Class_ErrorObject,
         Class_ErrorObjectWithMessage,
         Class_ErrorProto,
+        Class_QmlContextWrapper,
+        Class_QmlContext,
         NClasses
     };
     InternalClass *internalClasses[NClasses];
diff --git a/src/qml/jsruntime/qv4function_p.h b/src/qml/jsruntime/qv4function_p.h
index b11c8af94a..8b2d14a0cf 100644
--- a/src/qml/jsruntime/qv4function_p.h
+++ b/src/qml/jsruntime/qv4function_p.h
@@ -83,6 +83,7 @@ struct Q_QML_EXPORT Function {
         return compilationUnit->runtimeStrings[compiledFunction->nameIndex];
     }
     inline QString sourceFile() const { return compilationUnit->fileName(); }
+    inline QUrl finalUrl() const { return compilationUnit->finalUrl(); }
 
     inline bool usesArgumentsObject() const { return compiledFunction->flags & CompiledData::Function::UsesArgumentsObject; }
     inline bool isStrict() const { return compiledFunction->flags & CompiledData::Function::IsStrict; }
diff --git a/src/qml/jsruntime/qv4functionobject.cpp b/src/qml/jsruntime/qv4functionobject.cpp
index 45fdde98f7..2375aae92b 100644
--- a/src/qml/jsruntime/qv4functionobject.cpp
+++ b/src/qml/jsruntime/qv4functionobject.cpp
@@ -222,7 +222,7 @@ void FunctionCtor::construct(const Managed *that, Scope &scope, CallData *callDa
     IR::Module module(scope.engine->debugger() != 0);
 
     QQmlJS::RuntimeCodegen cg(scope.engine, f->strictMode());
-    cg.generateFromFunctionExpression(QString(), function, fe, &module);
+    cg.generateFromFunctionExpression(QString(), QString(), function, fe, &module);
 
     Compiler::JSUnitGenerator jsGenerator(&module);
     QScopedPointer<EvalInstructionSelection> isel(scope.engine->iselFactory->create(QQmlEnginePrivate::get(scope.engine), scope.engine->executableAllocator, &module, &jsGenerator));
diff --git a/src/qml/jsruntime/qv4global_p.h b/src/qml/jsruntime/qv4global_p.h
index 8769519a59..5cddf2eaa6 100644
--- a/src/qml/jsruntime/qv4global_p.h
+++ b/src/qml/jsruntime/qv4global_p.h
@@ -95,7 +95,7 @@ inline double trunc(double d) { return d > 0 ? floor(d) : ceil(d); }
     && (defined(Q_OS_WIN) || defined(Q_OS_LINUX) || defined(Q_OS_QNX) || defined(Q_OS_FREEBSD))
 #  define V4_ENABLE_JIT
 #elif defined(Q_PROCESSOR_X86_64) && (QT_POINTER_SIZE == 8) \
-    && (defined(Q_OS_WIN) || defined(Q_OS_LINUX) || defined(Q_OS_MAC) || defined(Q_OS_FREEBSD))
+    && (defined(Q_OS_WIN) || defined(Q_OS_LINUX) || defined(Q_OS_QNX) || defined(Q_OS_MAC) || defined(Q_OS_FREEBSD))
 #  define V4_ENABLE_JIT
 #elif defined(Q_PROCESSOR_ARM_32) && (QT_POINTER_SIZE == 4)
 #  if defined(thumb2) || defined(__thumb2__) || ((defined(__thumb) || defined(__thumb__)) && __TARGET_ARCH_THUMB-0 == 4)
@@ -104,7 +104,7 @@ inline double trunc(double d) { return d > 0 ? floor(d) : ceil(d); }
 #    define V4_ENABLE_JIT
 #  endif
 #elif defined(Q_PROCESSOR_ARM_64) && (QT_POINTER_SIZE == 8)
-#  if defined(Q_OS_LINUX)
+#  if defined(Q_OS_LINUX) || defined(Q_OS_QNX)
 #    define V4_ENABLE_JIT
 #  endif
 #elif defined(Q_PROCESSOR_MIPS_32) && defined(Q_OS_LINUX)
diff --git a/src/qml/jsruntime/qv4qmlcontext_p.h b/src/qml/jsruntime/qv4qmlcontext_p.h
index 48c9ee2c36..65bf4c60ce 100644
--- a/src/qml/jsruntime/qv4qmlcontext_p.h
+++ b/src/qml/jsruntime/qv4qmlcontext_p.h
@@ -91,6 +91,7 @@ struct Q_QML_EXPORT QQmlContextWrapper : Object
 {
     V4_OBJECT2(QQmlContextWrapper, Object)
     V4_NEEDS_DESTROY
+    V4_INTERNALCLASS(QmlContextWrapper)
 
     inline QObject *getScopeObject() const { return d()->scopeObject; }
     inline QQmlContextData *getContext() const { return *d()->context; }
@@ -104,6 +105,7 @@ struct Q_QML_EXPORT QQmlContextWrapper : Object
 struct Q_QML_EXPORT QmlContext : public ExecutionContext
 {
     V4_MANAGED(QmlContext, ExecutionContext)
+    V4_INTERNALCLASS(QmlContext)
 
     static Heap::QmlContext *createWorkerContext(QV4::ExecutionContext *parent, const QUrl &source, Value *sendFunction);
     static Heap::QmlContext *create(QV4::ExecutionContext *parent, QQmlContextData *context, QObject *scopeObject);
diff --git a/src/qml/jsruntime/qv4qobjectwrapper.cpp b/src/qml/jsruntime/qv4qobjectwrapper.cpp
index fb3aa47d1b..51a957acc9 100644
--- a/src/qml/jsruntime/qv4qobjectwrapper.cpp
+++ b/src/qml/jsruntime/qv4qobjectwrapper.cpp
@@ -714,6 +714,10 @@ bool QObjectWrapper::put(Managed *m, String *name, const Value &value)
 PropertyAttributes QObjectWrapper::query(const Managed *m, String *name)
 {
     const QObjectWrapper *that = static_cast<const QObjectWrapper*>(m);
+    const QObject *thatObject = that->d()->object();
+    if (QQmlData::wasDeleted(thatObject))
+        return QV4::Object::query(m, name);
+
     ExecutionEngine *engine = that->engine();
     QQmlContextData *qmlContext = engine->callingQmlContext();
     QQmlPropertyData local;
@@ -2083,10 +2087,10 @@ ReturnedValue QMetaObjectWrapper::callOverloadedConstructor(QV4::ExecutionEngine
 
     for (int i = 0; i < numberOfConstructors; i++) {
         const QQmlPropertyData & attempt = d()->constructors[i];
+        QQmlMetaObject::ArgTypeStorage storage;
         int methodArgumentCount = 0;
         int *methodArgTypes = 0;
         if (attempt.hasArguments()) {
-            QQmlMetaObject::ArgTypeStorage storage;
             int *args = object.constructorParameterTypes(attempt.coreIndex(), &storage, 0);
             if (!args) // Must be an unknown argument
                 continue;
diff --git a/src/qml/jsruntime/qv4script.cpp b/src/qml/jsruntime/qv4script.cpp
index 62145f36cc..9d1d5e2589 100644
--- a/src/qml/jsruntime/qv4script.cpp
+++ b/src/qml/jsruntime/qv4script.cpp
@@ -127,7 +127,8 @@ void Script::parse()
         }
 
         RuntimeCodegen cg(v4, strictMode);
-        cg.generateFromProgram(sourceFile, sourceCode, program, &module, QQmlJS::Codegen::EvalCode, inheritedLocals);
+        cg.generateFromProgram(sourceFile, sourceFile, sourceCode, program, &module,
+                               QQmlJS::Codegen::EvalCode, inheritedLocals);
         if (v4->hasException)
             return;
 
@@ -186,7 +187,10 @@ 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(
+        IR::Module *module, Compiler::JSUnitGenerator *unitGenerator, ExecutionEngine *engine,
+        const QString &fileName, const QString &finalUrl, const QString &source,
+        QList<QQmlError> *reportedErrors, QQmlJS::Directives *directivesCollector)
 {
     using namespace QQmlJS;
     using namespace QQmlJS::AST;
@@ -205,12 +209,12 @@ QQmlRefPointer<QV4::CompiledData::CompilationUnit> Script::precompile(IR::Module
     const auto diagnosticMessages = parser.diagnosticMessages();
     for (const QQmlJS::DiagnosticMessage &m : diagnosticMessages) {
         if (m.isWarning()) {
-            qWarning("%s:%d : %s", qPrintable(url.toString()), m.loc.startLine, qPrintable(m.message));
+            qWarning("%s:%d : %s", qPrintable(fileName), m.loc.startLine, qPrintable(m.message));
             continue;
         }
 
         QQmlError error;
-        error.setUrl(url);
+        error.setUrl(QUrl(fileName));
         error.setDescription(m.message);
         error.setLine(m.loc.startLine);
         error.setColumn(m.loc.startColumn);
@@ -231,7 +235,7 @@ QQmlRefPointer<QV4::CompiledData::CompilationUnit> Script::precompile(IR::Module
     }
 
     QQmlJS::Codegen cg(/*strict mode*/false);
-    cg.generateFromProgram(url.toString(), source, program, module, QQmlJS::Codegen::EvalCode);
+    cg.generateFromProgram(fileName, finalUrl, source, program, module, QQmlJS::Codegen::EvalCode);
     errors = cg.qmlErrors();
     if (!errors.isEmpty()) {
         if (reportedErrors)
diff --git a/src/qml/jsruntime/qv4script_p.h b/src/qml/jsruntime/qv4script_p.h
index 4ebe2dd609..55a349b5fc 100644
--- a/src/qml/jsruntime/qv4script_p.h
+++ b/src/qml/jsruntime/qv4script_p.h
@@ -139,8 +139,10 @@ 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,
-                                                                    QList<QQmlError> *reportedErrors = 0, QQmlJS::Directives *directivesCollector = 0);
+    static QQmlRefPointer<CompiledData::CompilationUnit> precompile(
+            IR::Module *module, Compiler::JSUnitGenerator *unitGenerator, ExecutionEngine *engine,
+            const QString &fileName, const QString &finalUrl, 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/memory/qv4mm.cpp b/src/qml/memory/qv4mm.cpp
index 8821d3c921..27b3c756c5 100644
--- a/src/qml/memory/qv4mm.cpp
+++ b/src/qml/memory/qv4mm.cpp
@@ -44,6 +44,7 @@
 #include "qv4qobjectwrapper_p.h"
 #include <QtCore/qalgorithms.h>
 #include <QtCore/private/qnumeric_p.h>
+#include <QtCore/qloggingcategory.h>
 #include <qqmlengine.h>
 #include "PageReservation.h"
 #include "PageAllocation.h"
@@ -91,6 +92,11 @@
 
 #define MIN_UNMANAGED_HEAPSIZE_GC_LIMIT std::size_t(128 * 1024)
 
+Q_LOGGING_CATEGORY(lcGcStats, "qt.qml.gc.statistics")
+Q_DECLARE_LOGGING_CATEGORY(lcGcStats)
+Q_LOGGING_CATEGORY(lcGcAllocatorStats, "qt.qml.gc.allocatorStats")
+Q_DECLARE_LOGGING_CATEGORY(lcGcAllocatorStats)
+
 using namespace WTF;
 
 QT_BEGIN_NAMESPACE
@@ -607,9 +613,9 @@ 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;
-#if MM_DEBUG
-    ++allocations[bin];
-#endif
+
+    if (allocationStats)
+        ++allocationStats[binForSlots(slotsRequired)];
 
     HeapItem **last;
 
@@ -751,37 +757,6 @@ void BlockAllocator::collectGrayItems(MarkStack *markStack)
 
 }
 
-#if MM_DEBUG
-void BlockAllocator::stats() {
-    DEBUG << "MM stats:";
-    QString s;
-    for (int i = 0; i < 10; ++i) {
-        uint c = 0;
-        HeapItem *item = freeBins[i];
-        while (item) {
-            ++c;
-            item = item->freeData.next;
-        }
-        s += QString::number(c) + QLatin1String(", ");
-    }
-    HeapItem *item = freeBins[NumBins - 1];
-    uint c = 0;
-    while (item) {
-        ++c;
-        item = item->freeData.next;
-    }
-    s += QLatin1String("..., ") + QString::number(c);
-    DEBUG << "bins:" << s;
-    QString a;
-    for (int i = 0; i < 10; ++i)
-        a += QString::number(allocations[i]) + QLatin1String(", ");
-    a += QLatin1String("..., ") + QString::number(allocations[NumBins - 1]);
-    DEBUG << "allocs:" << a;
-    memset(allocations, 0, sizeof(allocations));
-}
-#endif
-
-
 HeapItem *HugeItemAllocator::allocate(size_t size) {
     Chunk *c = chunkAllocator->allocate(size);
     chunks.push_back(HugeChunk{c, size});
@@ -858,11 +833,15 @@ MemoryManager::MemoryManager(ExecutionEngine *engine)
     , m_weakValues(new PersistentValueStorage(engine))
     , unmanagedHeapSizeGCLimit(MIN_UNMANAGED_HEAPSIZE_GC_LIMIT)
     , aggressiveGC(!qEnvironmentVariableIsEmpty("QV4_MM_AGGRESSIVE_GC"))
-    , gcStats(!qEnvironmentVariableIsEmpty(QV4_MM_STATS))
+    , gcStats(lcGcStats().isDebugEnabled())
+    , gcCollectorStats(lcGcAllocatorStats().isDebugEnabled())
 {
 #ifdef V4_USE_VALGRIND
     VALGRIND_CREATE_MEMPOOL(this, 0, true);
 #endif
+    memset(statistics.allocations, 0, sizeof(statistics.allocations));
+    if (gcStats)
+        blockAllocator.allocationStats = statistics.allocations;
 }
 
 #ifdef MM_STATS
@@ -922,9 +901,6 @@ Heap::Base *MemoryManager::allocData(std::size_t size)
         runGC();
         didRunGC = true;
     }
-#ifdef DETAILED_MM_STATS
-    willAllocate(size);
-#endif // DETAILED_MM_STATS
 
     Q_ASSERT(size >= Chunk::SlotSize);
     Q_ASSERT(size % Chunk::SlotSize == 0);
@@ -1125,9 +1101,10 @@ bool MemoryManager::shouldRunGC() const
 
 size_t dumpBins(BlockAllocator *b, bool printOutput = true)
 {
+    const QLoggingCategory &stats = lcGcAllocatorStats();
     size_t totalSlotMem = 0;
     if (printOutput)
-        qDebug() << "Slot map:";
+        qDebug(stats) << "Slot map:";
     for (uint i = 0; i < BlockAllocator::NumBins; ++i) {
         uint nEntries = 0;
         HeapItem *h = b->freeBins[i];
@@ -1137,7 +1114,7 @@ size_t dumpBins(BlockAllocator *b, bool printOutput = true)
             h = h->freeData.next;
         }
         if (printOutput)
-            qDebug() << "    number of entries in slot" << i << ":" << nEntries;
+            qDebug(stats) << "    number of entries in slot" << i << ":" << nEntries;
     }
     SDUMP() << "    large slot map";
     HeapItem *h = b->freeBins[BlockAllocator::NumBins - 1];
@@ -1147,7 +1124,7 @@ size_t dumpBins(BlockAllocator *b, bool printOutput = true)
     }
 
     if (printOutput)
-        qDebug() << "  total mem in bins" << totalSlotMem*Chunk::SlotSize;
+        qDebug(stats) << "  total mem in bins" << totalSlotMem*Chunk::SlotSize;
     return totalSlotMem*Chunk::SlotSize;
 }
 
@@ -1161,27 +1138,32 @@ void MemoryManager::runGC()
     QScopedValueRollback<bool> gcBlocker(gcBlocked, true);
 //    qDebug() << "runGC";
 
-    if (!gcStats) {
-//        uint oldUsed = allocator.usedMem();
+    if (gcStats) {
+        statistics.maxReservedMem = qMax(statistics.maxReservedMem, getAllocatedMem());
+        statistics.maxAllocatedMem = qMax(statistics.maxAllocatedMem, getUsedMem() + getLargeItemsMem());
+    }
+
+    if (!gcCollectorStats) {
         mark();
         sweep();
-//        DEBUG << "RUN GC: allocated:" << allocator.allocatedMem() << "used before" << oldUsed << "used now" << allocator.usedMem();
     } else {
         bool triggeredByUnmanagedHeap = (unmanagedHeapSize > unmanagedHeapSizeGCLimit);
         size_t oldUnmanagedSize = unmanagedHeapSize;
+
         const size_t totalMem = getAllocatedMem();
         const size_t usedBefore = getUsedMem();
         const size_t largeItemsBefore = getLargeItemsMem();
 
-        qDebug() << "========== GC ==========";
+        const QLoggingCategory &stats = lcGcAllocatorStats();
+        qDebug(stats) << "========== GC ==========";
 #ifdef MM_STATS
-        qDebug() << "    Triggered by alloc request of" << lastAllocRequestedSlots << "slots.";
-        qDebug() << "    Allocations since last GC" << allocationCount;
+        qDebug(stats) << "    Triggered by alloc request of" << lastAllocRequestedSlots << "slots.";
+        qDebug(stats) << "    Allocations since last GC" << allocationCount;
         allocationCount = 0;
 #endif
         size_t oldChunks = blockAllocator.chunks.size();
-        qDebug() << "Allocated" << totalMem << "bytes in" << oldChunks << "chunks";
-        qDebug() << "Fragmented memory before GC" << (totalMem - usedBefore);
+        qDebug(stats) << "Allocated" << totalMem << "bytes in" << oldChunks << "chunks";
+        qDebug(stats) << "Fragmented memory before GC" << (totalMem - usedBefore);
         dumpBins(&blockAllocator);
 
 #ifdef MM_STATS
@@ -1199,15 +1181,15 @@ void MemoryManager::runGC()
         qint64 sweepTime = t.nsecsElapsed()/1000;
 
         if (triggeredByUnmanagedHeap) {
-            qDebug() << "triggered by unmanaged heap:";
-            qDebug() << "   old unmanaged heap size:" << oldUnmanagedSize;
-            qDebug() << "   new unmanaged heap:" << unmanagedHeapSize;
-            qDebug() << "   unmanaged heap limit:" << unmanagedHeapSizeGCLimit;
+            qDebug(stats) << "triggered by unmanaged heap:";
+            qDebug(stats) << "   old unmanaged heap size:" << oldUnmanagedSize;
+            qDebug(stats) << "   new unmanaged heap:" << unmanagedHeapSize;
+            qDebug(stats) << "   unmanaged heap limit:" << unmanagedHeapSizeGCLimit;
         }
         size_t memInBins = dumpBins(&blockAllocator);
-        qDebug() << "Marked object in" << markTime << "us.";
-        qDebug() << "   " << markStackSize << "objects marked";
-        qDebug() << "Sweeped object in" << sweepTime << "us.";
+        qDebug(stats) << "Marked object in" << markTime << "us.";
+        qDebug(stats) << "   " << markStackSize << "objects marked";
+        qDebug(stats) << "Sweeped object in" << sweepTime << "us.";
 
         // sort our object types by number of freed instances
         MMStatsHash freedObjectStats;
@@ -1222,26 +1204,29 @@ void MemoryManager::runGC()
             return a.second > b.second && strcmp(a.first, b.first) < 0;
         });
 
-        qDebug() << "Used memory before GC:" << usedBefore;
-        qDebug() << "Used memory after GC:" << usedAfter;
-        qDebug() << "Freed up bytes      :" << (usedBefore - usedAfter);
-        qDebug() << "Freed up chunks     :" << (oldChunks - blockAllocator.chunks.size());
+        qDebug(stats) << "Used memory before GC:" << usedBefore;
+        qDebug(stats) << "Used memory after GC:" << usedAfter;
+        qDebug(stats) << "Freed up bytes      :" << (usedBefore - usedAfter);
+        qDebug(stats) << "Freed up chunks     :" << (oldChunks - blockAllocator.chunks.size());
         size_t lost = blockAllocator.allocatedMem() - memInBins - usedAfter;
         if (lost)
-            qDebug() << "!!!!!!!!!!!!!!!!!!!!! LOST MEM:" << lost << "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!";
+            qDebug(stats) << "!!!!!!!!!!!!!!!!!!!!! LOST MEM:" << lost << "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!";
         if (largeItemsBefore || largeItemsAfter) {
-            qDebug() << "Large item memory before GC:" << largeItemsBefore;
-            qDebug() << "Large item memory after GC:" << largeItemsAfter;
-            qDebug() << "Large item memory freed up:" << (largeItemsBefore - largeItemsAfter);
+            qDebug(stats) << "Large item memory before GC:" << largeItemsBefore;
+            qDebug(stats) << "Large item memory after GC:" << largeItemsAfter;
+            qDebug(stats) << "Large item memory freed up:" << (largeItemsBefore - largeItemsAfter);
         }
 
         for (auto it = freedObjectsSorted.cbegin(); it != freedObjectsSorted.cend(); ++it) {
-            qDebug().noquote() << QString::fromLatin1("Freed JS type: %1 (%2 instances)").arg(QString::fromLatin1(it->first), QString::number(it->second));
+            qDebug(stats).noquote() << QString::fromLatin1("Freed JS type: %1 (%2 instances)").arg(QString::fromLatin1(it->first), QString::number(it->second));
         }
 
-        qDebug() << "======== End GC ========";
+        qDebug(stats) << "======== End GC ========";
     }
 
+    if (gcStats)
+        statistics.maxUsedMem = qMax(statistics.maxUsedMem, getUsedMem() + getLargeItemsMem());
+
     if (aggressiveGC) {
         // ensure we don't 'loose' any memory
         Q_ASSERT(blockAllocator.allocatedMem() == getUsedMem() + dumpBins(&blockAllocator, false));
@@ -1273,6 +1258,8 @@ MemoryManager::~MemoryManager()
 {
     delete m_persistentValues;
 
+    dumpStats();
+
     sweep(/*lastSweep*/true);
     blockAllocator.freeAll();
     hugeItemAllocator.freeAll();
@@ -1288,30 +1275,20 @@ MemoryManager::~MemoryManager()
 
 void MemoryManager::dumpStats() const
 {
-#ifdef DETAILED_MM_STATS
-    std::cerr << "=================" << std::endl;
-    std::cerr << "Allocation stats:" << std::endl;
-    std::cerr << "Requests for each chunk size:" << std::endl;
-    for (int i = 0; i < allocSizeCounters.size(); ++i) {
-        if (unsigned count = allocSizeCounters[i]) {
-            std::cerr << "\t" << (i << 4) << " bytes chunks: " << count << std::endl;
-        }
-    }
-#endif // DETAILED_MM_STATS
-}
+    if (!gcStats)
+        return;
 
-#ifdef DETAILED_MM_STATS
-void MemoryManager::willAllocate(std::size_t size)
-{
-    unsigned alignedSize = (size + 15) >> 4;
-    QVector<unsigned> &counters = allocSizeCounters;
-    if ((unsigned) counters.size() < alignedSize + 1)
-        counters.resize(alignedSize + 1);
-    counters[alignedSize]++;
+    const QLoggingCategory &stats = lcGcStats();
+    qDebug(stats) << "Qml GC memory allocation statistics:";
+    qDebug(stats) << "Total memory allocated:" << statistics.maxReservedMem;
+    qDebug(stats) << "Max memory used before a GC run:" << statistics.maxAllocatedMem;
+    qDebug(stats) << "Max memory used after a GC run:" << statistics.maxUsedMem;
+    qDebug(stats) << "Requests for different item sizes:";
+    for (int i = 1; i < BlockAllocator::NumBins - 1; ++i)
+        qDebug(stats) << "     <" << (i << Chunk::SlotSizeShift) << " bytes: " << statistics.allocations[i];
+    qDebug(stats) << "     >=" << ((BlockAllocator::NumBins - 1) << Chunk::SlotSizeShift) << " bytes: " << statistics.allocations[BlockAllocator::NumBins - 1];
 }
 
-#endif // DETAILED_MM_STATS
-
 void MemoryManager::collectFromJSStack(MarkStack *markStack) const
 {
     Value *v = engine->jsStackBase;
diff --git a/src/qml/memory/qv4mm_p.h b/src/qml/memory/qv4mm_p.h
index e16a0ca544..fb21481d5b 100644
--- a/src/qml/memory/qv4mm_p.h
+++ b/src/qml/memory/qv4mm_p.h
@@ -58,8 +58,6 @@
 #include <private/qv4mmdefs_p.h>
 #include <QVector>
 
-//#define DETAILED_MM_STATS
-
 #define QV4_MM_MAXBLOCK_SHIFT "QV4_MM_MAXBLOCK_SHIFT"
 #define QV4_MM_MAX_CHUNK_SIZE "QV4_MM_MAX_CHUNK_SIZE"
 #define QV4_MM_STATS "QV4_MM_STATS"
@@ -122,9 +120,6 @@ struct BlockAllocator {
         : chunkAllocator(chunkAllocator), engine(engine)
     {
         memset(freeBins, 0, sizeof(freeBins));
-#if MM_DEBUG
-        memset(allocations, 0, sizeof(allocations));
-#endif
     }
 
     enum { NumBins = 8 };
@@ -133,10 +128,6 @@ struct BlockAllocator {
         return nSlots >= NumBins ? NumBins - 1 : nSlots;
     }
 
-#if MM_DEBUG
-    void stats();
-#endif
-
     HeapItem *allocate(size_t size, bool forceAllocation = false);
 
     size_t totalSlots() const {
@@ -166,9 +157,7 @@ struct BlockAllocator {
     ChunkAllocator *chunkAllocator;
     ExecutionEngine *engine;
     std::vector<Chunk *> chunks;
-#if MM_DEBUG
-    uint allocations[NumBins];
-#endif
+    uint *allocationStats = nullptr;
 };
 
 struct HugeItemAllocator {
@@ -453,10 +442,6 @@ protected:
     Heap::Base *allocData(std::size_t size);
     Heap::Object *allocObjectWithMemberData(const QV4::VTable *vtable, uint nMembers);
 
-#ifdef DETAILED_MM_STATS
-    void willAllocate(std::size_t size);
-#endif // DETAILED_MM_STATS
-
 private:
     void collectFromJSStack(MarkStack *markStack) const;
     void mark();
@@ -481,6 +466,14 @@ public:
     bool gcBlocked = false;
     bool aggressiveGC = false;
     bool gcStats = false;
+    bool gcCollectorStats = false;
+
+    struct {
+        size_t maxReservedMem = 0;
+        size_t maxAllocatedMem = 0;
+        size_t maxUsedMem = 0;
+        uint allocations[BlockAllocator::NumBins];
+    } statistics;
 };
 
 }
diff --git a/src/qml/qml/qqmlcomponent.cpp b/src/qml/qml/qqmlcomponent.cpp
index 8ec8669c60..e895f1df1b 100644
--- a/src/qml/qml/qqmlcomponent.cpp
+++ b/src/qml/qml/qqmlcomponent.cpp
@@ -496,8 +496,7 @@ QQmlComponent::QQmlComponent(QQmlEngine *engine, QObject *parent)
     Create a QQmlComponent from the given \a url and give it the
     specified \a parent and \a engine.
 
-    Ensure that the URL provided is full and correct, in particular, use
-    \l QUrl::fromLocalFile() when loading a file from the local filesystem.
+    \include qqmlcomponent.qdoc url-note
 
     \sa loadUrl()
 */
@@ -511,8 +510,7 @@ QQmlComponent::QQmlComponent(QQmlEngine *engine, const QUrl &url, QObject *paren
     specified \a parent and \a engine. If \a mode is \l Asynchronous,
     the component will be loaded and compiled asynchronously.
 
-    Ensure that the URL provided is full and correct, in particular, use
-    \l QUrl::fromLocalFile() when loading a file from the local filesystem.
+    \include qqmlcomponent.qdoc url-note
 
     \sa loadUrl()
 */
@@ -548,7 +546,7 @@ QQmlComponent::QQmlComponent(QQmlEngine *engine, const QString &fileName,
     : QQmlComponent(engine, parent)
 {
     Q_D(QQmlComponent);
-    const QUrl url = QDir::isAbsolutePath(fileName) ? QUrl::fromLocalFile(fileName) : d->engine->baseUrl().resolved(QUrl(fileName));
+    const QUrl url = QDir::isAbsolutePath(fileName) ? QUrl::fromLocalFile(fileName) : QUrl(fileName);
     d->loadUrl(url, mode);
 }
 
@@ -561,7 +559,7 @@ QQmlComponent::QQmlComponent(QQmlEngine *engine, QV4::CompiledData::CompilationU
     Q_D(QQmlComponent);
     d->compilationUnit = compilationUnit;
     d->start = start;
-    d->url = compilationUnit->url();
+    d->url = compilationUnit->finalUrl();
     d->progress = 1.0;
 }
 
@@ -608,8 +606,7 @@ QQmlContext *QQmlComponent::creationContext() const
 /*!
     Load the QQmlComponent from the provided \a url.
 
-    Ensure that the URL provided is full and correct, in particular, use
-    \l QUrl::fromLocalFile() when loading a file from the local filesystem.
+    \include qqmlcomponent.qdoc url-note
 */
 void QQmlComponent::loadUrl(const QUrl &url)
 {
@@ -621,8 +618,7 @@ void QQmlComponent::loadUrl(const QUrl &url)
     Load the QQmlComponent from the provided \a url.
     If \a mode is \l Asynchronous, the component will be loaded and compiled asynchronously.
 
-    Ensure that the URL provided is full and correct, in particular, use
-    \l QUrl::fromLocalFile() when loading a file from the local filesystem.
+    \include qqmlcomponent.qdoc url-note
 */
 void QQmlComponent::loadUrl(const QUrl &url, QQmlComponent::CompilationMode mode)
 {
@@ -635,11 +631,21 @@ void QQmlComponentPrivate::loadUrl(const QUrl &newUrl, QQmlComponent::Compilatio
     Q_Q(QQmlComponent);
     clear();
 
-    if ((newUrl.isRelative() && !newUrl.isEmpty())
-    || newUrl.scheme() == QLatin1String("file")) // Workaround QTBUG-11929
-        url = engine->baseUrl().resolved(newUrl);
-    else
+    if (newUrl.isRelative()) {
+        // The new URL is a relative URL like QUrl("main.qml").
+        url = engine->baseUrl().resolved(QUrl(newUrl.toString()));
+    } else if (engine->baseUrl().isLocalFile() && newUrl.isLocalFile() && !QDir::isAbsolutePath(newUrl.toLocalFile())) {
+        // The new URL is a file on disk but it's a relative path; e.g.:
+        // QUrl::fromLocalFile("main.qml") or QUrl("file:main.qml")
+        // We need to remove the scheme so that it becomes a relative URL with a relative path:
+        QUrl fixedUrl(newUrl);
+        fixedUrl.setScheme(QString());
+        // Then, turn it into an absolute URL with an absolute path by resolving it against the engine's baseUrl().
+        // This is a compatibility hack for QTBUG-58837.
+        url = engine->baseUrl().resolved(fixedUrl);
+    } else {
         url = newUrl;
+    }
 
     if (newUrl.isEmpty()) {
         QQmlError error;
@@ -1073,7 +1079,6 @@ void QQmlComponentPrivate::incubateObject(
     QQmlComponentPrivate *componentPriv = QQmlComponentPrivate::get(component);
 
     incubatorPriv->compilationUnit = componentPriv->compilationUnit;
-    incubatorPriv->compilationUnit->addref();
     incubatorPriv->enginePriv = enginePriv;
     incubatorPriv->creator.reset(new QQmlObjectCreator(context, componentPriv->compilationUnit, componentPriv->creationContext));
     incubatorPriv->subComponentToCreate = componentPriv->start;
diff --git a/src/qml/qml/qqmlcontext.cpp b/src/qml/qml/qqmlcontext.cpp
index 37cb328b36..59e2c83a63 100644
--- a/src/qml/qml/qqmlcontext.cpp
+++ b/src/qml/qml/qqmlcontext.cpp
@@ -845,14 +845,14 @@ QV4::IdentifierHash<int> &QQmlContextData::detachedPropertyNames()
 QUrl QQmlContextData::url() const
 {
     if (typeCompilationUnit)
-        return typeCompilationUnit->url();
+        return typeCompilationUnit->finalUrl();
     return baseUrl;
 }
 
 QString QQmlContextData::urlString() const
 {
     if (typeCompilationUnit)
-        return typeCompilationUnit->fileName();
+        return typeCompilationUnit->finalUrlString();
     return baseUrlString;
 }
 
diff --git a/src/qml/qml/qqmldata_p.h b/src/qml/qml/qqmldata_p.h
index 63994a392d..5794e6f0c5 100644
--- a/src/qml/qml/qqmldata_p.h
+++ b/src/qml/qml/qqmldata_p.h
@@ -156,18 +156,21 @@ public:
     quint32 hasInterceptorMetaObject:1;
     quint32 hasVMEMetaObject:1;
     quint32 parentFrozen:1;
-    quint32 dummy:22;
+    quint32 dummy:6;
 
     // When bindingBitsSize < sizeof(ptr), we store the binding bit flags inside
     // bindingBitsValue. When we need more than sizeof(ptr) bits, we allocated
     // sufficient space and use bindingBits to point to it.
-    int bindingBitsSize;
+    quint32 bindingBitsArraySize : 16;
     typedef quintptr BindingBitsType;
+    enum {
+        BitsPerType = sizeof(BindingBitsType) * 8,
+        InlineBindingArraySize = 2
+    };
     union {
         BindingBitsType *bindingBits;
-        BindingBitsType bindingBitsValue;
+        BindingBitsType bindingBitsValue[InlineBindingArraySize];
     };
-    enum { MaxInlineBits = sizeof(BindingBitsType) * 8 };
 
     struct NotifyList {
         quint64 connectionMask;
@@ -259,7 +262,7 @@ public:
     bool hasExtendedData() const { return extendedData != 0; }
     QHash<int, QObject *> *attachedProperties() const;
 
-    static inline bool wasDeleted(QObject *);
+    static inline bool wasDeleted(const QObject *);
 
     static void markAsDeleted(QObject *);
     static void setQueuedForDeletion(QObject *);
@@ -275,6 +278,9 @@ public:
         return createPropertyCache(engine, object);
     }
 
+    Q_ALWAYS_INLINE static uint offsetForBit(int bit) { return static_cast<uint>(bit) / BitsPerType; }
+    Q_ALWAYS_INLINE static BindingBitsType bitFlagForBit(int bit) { return BindingBitsType(1) << (static_cast<uint>(bit) & (BitsPerType - 1)); }
+
 private:
     // For attachedProperties
     mutable QQmlDataExtended *extendedData;
@@ -286,26 +292,25 @@ private:
 
     Q_ALWAYS_INLINE bool hasBitSet(int bit) const
     {
-        if (bindingBitsSize <= bit)
+        uint offset = offsetForBit(bit);
+        if (bindingBitsArraySize <= offset)
             return false;
 
-        if (bindingBitsSize == MaxInlineBits)
-            return bindingBitsValue & (BindingBitsType(1) << bit);
-        else
-            return bindingBits[bit / MaxInlineBits] & (BindingBitsType(1) << (bit % MaxInlineBits));
+        const BindingBitsType *bits = (bindingBitsArraySize == InlineBindingArraySize) ? bindingBitsValue : bindingBits;
+        return bits[offset] & bitFlagForBit(bit);
     }
 };
 
-bool QQmlData::wasDeleted(QObject *object)
+bool QQmlData::wasDeleted(const QObject *object)
 {
     if (!object)
         return true;
 
-    QObjectPrivate *priv = QObjectPrivate::get(object);
+    const QObjectPrivate *priv = QObjectPrivate::get(object);
     if (!priv || priv->wasDeleted)
         return true;
 
-    QQmlData *ddata = QQmlData::get(object);
+    const QQmlData *ddata = QQmlData::get(object);
     return ddata && ddata->isQueuedForDeletion;
 }
 
diff --git a/src/qml/qml/qqmlengine.cpp b/src/qml/qml/qqmlengine.cpp
index 20f9b6439d..d53c94e901 100644
--- a/src/qml/qml/qqmlengine.cpp
+++ b/src/qml/qml/qqmlengine.cpp
@@ -110,7 +110,10 @@ Q_DECLARE_METATYPE(QQmlProperty)
 QT_BEGIN_NAMESPACE
 
 typedef QQmlData::BindingBitsType BindingBitsType;
-enum { MaxInlineBits = QQmlData::MaxInlineBits };
+enum {
+    BitsPerType = QQmlData::BitsPerType,
+    InlineBindingArraySize = QQmlData::InlineBindingArraySize
+};
 
 void qmlRegisterBaseTypes(const char *uri, int versionMajor, int versionMinor)
 {
@@ -747,11 +750,12 @@ QQmlData::QQmlData()
     : ownedByQml1(false), ownMemory(true), indestructible(true), explicitIndestructibleSet(false),
       hasTaintedV4Object(false), isQueuedForDeletion(false), rootObjectInCreation(false),
       hasInterceptorMetaObject(false), hasVMEMetaObject(false), parentFrozen(false),
-      bindingBitsSize(MaxInlineBits), bindingBitsValue(0), notifyList(0),
+      bindingBitsArraySize(InlineBindingArraySize), notifyList(0),
       bindings(0), signalHandlers(0), nextContextObject(0), prevContextObject(0),
       lineNumber(0), columnNumber(0), jsEngineId(0), compilationUnit(0),
       propertyCache(0), guards(0), extendedData(0)
 {
+    memset(bindingBitsValue, 0, sizeof(bindingBitsValue));
     init();
 }
 
@@ -1825,7 +1829,7 @@ void QQmlData::destroyed(QObject *object)
         signalHandler = next;
     }
 
-    if (bindingBitsSize > MaxInlineBits)
+    if (bindingBitsArraySize > InlineBindingArraySize)
         free(bindingBits);
 
     if (propertyCache)
@@ -1874,47 +1878,35 @@ void QQmlData::parentChanged(QObject *object, QObject *parent)
 
 static void QQmlData_setBit(QQmlData *data, QObject *obj, int bit)
 {
-    if (Q_UNLIKELY(data->bindingBitsSize <= bit)) {
+    uint offset = QQmlData::offsetForBit(bit);
+    BindingBitsType *bits = (data->bindingBitsArraySize == InlineBindingArraySize) ? data->bindingBitsValue : data->bindingBits;
+    if (Q_UNLIKELY(data->bindingBitsArraySize <= offset)) {
         int props = QQmlMetaObject(obj).propertyCount();
         Q_ASSERT(bit < 2 * props);
 
-        int arraySize = (2 * props + MaxInlineBits - 1) / MaxInlineBits;
-        Q_ASSERT(arraySize > 1);
-
-        // special handling for 32 here is to make sure we wipe the first byte
-        // when going from bindingBitsValue to bindingBits, and preserve the old
-        // set bits so we can restore them after the allocation
-        int oldArraySize = data->bindingBitsSize > MaxInlineBits ? data->bindingBitsSize / MaxInlineBits : 0;
-        quintptr oldValue = data->bindingBitsSize == MaxInlineBits ? data->bindingBitsValue : 0;
-
-        data->bindingBits = static_cast<BindingBitsType *>(realloc((data->bindingBitsSize == MaxInlineBits) ? 0 : data->bindingBits,
-                                                                   arraySize * sizeof(BindingBitsType)));
-
-        memset(data->bindingBits + oldArraySize,
-               0x00,
-               sizeof(BindingBitsType) * (arraySize - oldArraySize));
+        uint arraySize = (2 * static_cast<uint>(props) + BitsPerType - 1) / BitsPerType;
+        Q_ASSERT(arraySize > InlineBindingArraySize && arraySize > data->bindingBitsArraySize);
 
-        data->bindingBitsSize = arraySize * MaxInlineBits;
+        BindingBitsType *newBits = static_cast<BindingBitsType *>(malloc(arraySize*sizeof(BindingBitsType)));
+        memcpy(newBits, bits, data->bindingBitsArraySize * sizeof(BindingBitsType));
+        memset(newBits + data->bindingBitsArraySize, 0, sizeof(BindingBitsType) * (arraySize - data->bindingBitsArraySize));
 
-        // reinstate bindingBitsValue after we dropped it
-        if (oldValue) {
-            memcpy(data->bindingBits, &oldValue, sizeof(oldValue));
-        }
+        if (data->bindingBitsArraySize > InlineBindingArraySize)
+            free(bits);
+        data->bindingBits = newBits;
+        bits = newBits;
+        data->bindingBitsArraySize = arraySize;
     }
-
-    if (data->bindingBitsSize == MaxInlineBits)
-        data->bindingBitsValue |= BindingBitsType(1) << bit;
-    else
-        data->bindingBits[bit / MaxInlineBits] |= (BindingBitsType(1) << (bit % MaxInlineBits));
+    Q_ASSERT(offset < data->bindingBitsArraySize);
+    bits[offset] |= QQmlData::bitFlagForBit(bit);
 }
 
 static void QQmlData_clearBit(QQmlData *data, int bit)
 {
-    if (data->bindingBitsSize > bit) {
-        if (data->bindingBitsSize == MaxInlineBits)
-            data->bindingBitsValue &= ~(BindingBitsType(1) << (bit % MaxInlineBits));
-        else
-            data->bindingBits[bit / MaxInlineBits] &= ~(BindingBitsType(1) << (bit % MaxInlineBits));
+    uint offset = QQmlData::offsetForBit(bit);
+    if (data->bindingBitsArraySize > offset) {
+        BindingBitsType *bits = (data->bindingBitsArraySize == InlineBindingArraySize) ? data->bindingBitsValue : data->bindingBits;
+        bits[offset] &= ~QQmlData::bitFlagForBit(bit);
     }
 }
 
diff --git a/src/qml/qml/qqmlincubator.cpp b/src/qml/qml/qqmlincubator.cpp
index 6d0e4b915a..9855c27375 100644
--- a/src/qml/qml/qqmlincubator.cpp
+++ b/src/qml/qml/qqmlincubator.cpp
@@ -272,7 +272,7 @@ void QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt &i)
     if (!compilationUnit)
         return;
 
-    QML_MEMORY_SCOPE_URL(compilationUnit->url());
+    QML_MEMORY_SCOPE_URL(compilationUnit->finalUrl());
 
     QExplicitlySharedDataPointer<QQmlIncubatorPrivate> protectThis(this);
 
@@ -377,23 +377,6 @@ finishIncubate:
     }
 }
 
-void QQmlIncubatorPrivate::cancel(QObject *object, QQmlContext *context)
-{
-    if (!context)
-        context = qmlContext(object);
-    if (!context)
-        return;
-
-    QQmlContextData *data = QQmlContextData::get(context);
-    QQmlIncubatorPrivate *p = data->incubator;
-    if (!p)
-        return;
-
-    p->vmeGuard.unguard(object);
-    if (!p->creator.isNull())
-        p->creator->cancel(object);
-}
-
 /*!
 Incubate objects for \a msecs, or until there are no more objects to incubate.
 */
diff --git a/src/qml/qml/qqmlincubator_p.h b/src/qml/qml/qqmlincubator_p.h
index 758e0a29f6..676ba1a29a 100644
--- a/src/qml/qml/qqmlincubator_p.h
+++ b/src/qml/qml/qqmlincubator_p.h
@@ -102,9 +102,6 @@ public:
 
     void forceCompletion(QQmlInstantiationInterrupt &i);
     void incubate(QQmlInstantiationInterrupt &i);
-
-    // used by Qt Quick Controls 2
-    Q_QML_PRIVATE_EXPORT static void cancel(QObject *object, QQmlContext *context = 0);
 };
 
 QT_END_NAMESPACE
diff --git a/src/qml/qml/qqmlobjectcreator.cpp b/src/qml/qml/qqmlobjectcreator.cpp
index 7761eb4677..7caab2a5d3 100644
--- a/src/qml/qml/qqmlobjectcreator.cpp
+++ b/src/qml/qml/qqmlobjectcreator.cpp
@@ -445,7 +445,7 @@ void QQmlObjectCreator::setPropertyValue(const QQmlPropertyData *property, const
         QString string = binding->valueAsString(qmlUnit);
         // Encoded dir-separators defeat QUrl processing - decode them first
         string.replace(QLatin1String("%2f"), QLatin1String("/"), Qt::CaseInsensitive);
-        QUrl value = string.isEmpty() ? QUrl() : compilationUnit->url().resolved(QUrl(string));
+        QUrl value = string.isEmpty() ? QUrl() : compilationUnit->finalUrl().resolved(QUrl(string));
         // Apply URL interceptor
         if (engine->urlInterceptor())
             value = engine->urlInterceptor()->intercept(value, QQmlAbstractUrlInterceptor::UrlString);
@@ -643,7 +643,8 @@ void QQmlObjectCreator::setPropertyValue(const QQmlPropertyData *property, const
         } else if (property->propType() == qMetaTypeId<QList<QUrl> >()) {
             Q_ASSERT(binding->type == QV4::CompiledData::Binding::Type_String);
             QString urlString = binding->valueAsString(qmlUnit);
-            QUrl u = urlString.isEmpty() ? QUrl() : compilationUnit->url().resolved(QUrl(urlString));
+            QUrl u = urlString.isEmpty() ? QUrl()
+                                         : compilationUnit->finalUrl().resolved(QUrl(urlString));
             QList<QUrl> value;
             value.append(u);
             property->writeProperty(_qobject, &value, propertyWriteFlags);
@@ -1103,12 +1104,9 @@ void QQmlObjectCreator::registerObjectWithContextById(const QV4::CompiledData::O
         context->setIdProperty(object->id, instance);
 }
 
-QV4::QmlContext *QQmlObjectCreator::currentQmlContext()
+void QQmlObjectCreator::createQmlContext()
 {
-    if (!_qmlContext->isManaged())
-        _qmlContext->setM(QV4::QmlContext::create(v4->rootContext(), context, _scopeObject));
-
-    return _qmlContext;
+    _qmlContext->setM(QV4::QmlContext::create(v4->rootContext(), context, _scopeObject));
 }
 
 QObject *QQmlObjectCreator::createInstance(int index, QObject *parent, bool isContextObject)
@@ -1349,21 +1347,6 @@ QQmlContextData *QQmlObjectCreator::finalize(QQmlInstantiationInterrupt &interru
     return sharedState->rootContext;
 }
 
-void QQmlObjectCreator::cancel(QObject *object)
-{
-    int last = sharedState->allCreatedObjects.count() - 1;
-    int i = last;
-    while (i >= 0) {
-        if (sharedState->allCreatedObjects.at(i) == object) {
-            if (i < last)
-                qSwap(sharedState->allCreatedObjects[i], sharedState->allCreatedObjects[last]);
-            sharedState->allCreatedObjects.pop();
-            break;
-        }
-        --i;
-    }
-}
-
 void QQmlObjectCreator::clear()
 {
     if (phase == Done || phase == Finalizing || phase == Startup)
diff --git a/src/qml/qml/qqmlobjectcreator_p.h b/src/qml/qml/qqmlobjectcreator_p.h
index 593d89e5d5..f4c03af5b7 100644
--- a/src/qml/qml/qqmlobjectcreator_p.h
+++ b/src/qml/qml/qqmlobjectcreator_p.h
@@ -92,7 +92,6 @@ public:
     bool populateDeferredProperties(QObject *instance, QQmlData::DeferredData *deferredData);
     bool populateDeferredBinding(const QQmlProperty &qmlProperty, QQmlData::DeferredData *deferredData, const QV4::CompiledData::Binding *binding);
     QQmlContextData *finalize(QQmlInstantiationInterrupt &interrupt);
-    void cancel(QObject *object);
     void clear();
 
     QQmlComponentAttached **componentAttachment() const { return &sharedState->componentAttached; }
@@ -124,7 +123,8 @@ private:
 
     void registerObjectWithContextById(const QV4::CompiledData::Object *object, QObject *instance) const;
 
-    QV4::QmlContext *currentQmlContext();
+    inline QV4::QmlContext *currentQmlContext();
+    Q_NEVER_INLINE void createQmlContext();
 
     enum Phase {
         Startup,
@@ -174,6 +174,14 @@ private:
     QRecursionWatcher<QQmlObjectCreatorSharedState, &QQmlObjectCreatorSharedState::recursionNode> watcher;
 };
 
+QV4::QmlContext *QQmlObjectCreator::currentQmlContext()
+{
+    if (!_qmlContext->isManaged())
+        _qmlContext->setM(QV4::QmlContext::create(v4->rootContext(), context, _scopeObject));
+
+    return _qmlContext;
+}
+
 QT_END_NAMESPACE
 
 #endif // QQMLOBJECTCREATOR_P_H
diff --git a/src/qml/qml/qqmlproperty.cpp b/src/qml/qml/qqmlproperty.cpp
index 9a138dcf80..50d9f13049 100644
--- a/src/qml/qml/qqmlproperty.cpp
+++ b/src/qml/qml/qqmlproperty.cpp
@@ -223,6 +223,22 @@ QQmlProperty::QQmlProperty(QObject *obj, const QString &name, QQmlEngine *engine
     if (!isValid()) { d->object = 0; d->context = 0; d->engine = 0; }
 }
 
+QQmlProperty QQmlPropertyPrivate::create(QObject *target, const QString &propertyName, QQmlContextData *context)
+{
+    QQmlProperty result;
+    auto d = new QQmlPropertyPrivate;
+    result.d = d;
+    d->context = context;
+    d->engine = context ? context->engine : nullptr;
+    d->initProperty(target, propertyName);
+    if (!result.isValid()) {
+        d->object = nullptr;
+        d->context = nullptr;
+        d->engine = nullptr;
+    }
+    return result;
+}
+
 QQmlPropertyPrivate::QQmlPropertyPrivate()
 : context(0), engine(0), object(0), isNameCached(false)
 {
@@ -241,89 +257,93 @@ void QQmlPropertyPrivate::initProperty(QObject *obj, const QString &name)
 
     QQmlTypeNameCache *typeNameCache = context?context->imports:0;
 
-    const auto path = name.splitRef(QLatin1Char('.'));
-    if (path.isEmpty()) return;
-
     QObject *currentObject = obj;
-
-    // Everything up to the last property must be an "object type" property
-    for (int ii = 0; ii < path.count() - 1; ++ii) {
-        const QStringRef &pathName = path.at(ii);
-
-        if (typeNameCache) {
-            QQmlTypeNameCache::Result r = typeNameCache->query(pathName);
-            if (r.isValid()) {
-                if (r.type.isValid()) {
-                    QQmlEnginePrivate *enginePrivate = QQmlEnginePrivate::get(engine);
-                    QQmlAttachedPropertiesFunc func = r.type.attachedPropertiesFunction(enginePrivate);
-                    if (!func) return; // Not an attachable type
-
-                    currentObject = qmlAttachedPropertiesObjectById(r.type.attachedPropertiesId(enginePrivate), currentObject);
-                    if (!currentObject) return; // Something is broken with the attachable type
-                } else if (r.importNamespace) {
-                    if ((ii + 1) == path.count()) return; // No type following the namespace
-
-                    ++ii; r = typeNameCache->query(path.at(ii), r.importNamespace);
-                    if (!r.type.isValid()) return; // Invalid type in namespace
-
-                    QQmlEnginePrivate *enginePrivate = QQmlEnginePrivate::get(engine);
-                    QQmlAttachedPropertiesFunc func = r.type.attachedPropertiesFunction(enginePrivate);
-                    if (!func) return; // Not an attachable type
-
-                    currentObject = qmlAttachedPropertiesObjectById(r.type.attachedPropertiesId(enginePrivate), currentObject);
-                    if (!currentObject) return; // Something is broken with the attachable type
-
-                } else if (r.scriptIndex != -1) {
-                    return; // Not a type
-                } else {
-                    Q_ASSERT(!"Unreachable");
+    QVector<QStringRef> path;
+    QStringRef terminal(&name);
+
+    if (name.contains(QLatin1Char('.'))) {
+        path = name.splitRef(QLatin1Char('.'));
+        if (path.isEmpty()) return;
+
+        // Everything up to the last property must be an "object type" property
+        for (int ii = 0; ii < path.count() - 1; ++ii) {
+            const QStringRef &pathName = path.at(ii);
+
+            if (typeNameCache) {
+                QQmlTypeNameCache::Result r = typeNameCache->query(pathName);
+                if (r.isValid()) {
+                    if (r.type.isValid()) {
+                        QQmlEnginePrivate *enginePrivate = QQmlEnginePrivate::get(engine);
+                        QQmlAttachedPropertiesFunc func = r.type.attachedPropertiesFunction(enginePrivate);
+                        if (!func) return; // Not an attachable type
+
+                        currentObject = qmlAttachedPropertiesObjectById(r.type.attachedPropertiesId(enginePrivate), currentObject);
+                        if (!currentObject) return; // Something is broken with the attachable type
+                    } else if (r.importNamespace) {
+                        if ((ii + 1) == path.count()) return; // No type following the namespace
+
+                        ++ii; r = typeNameCache->query(path.at(ii), r.importNamespace);
+                        if (!r.type.isValid()) return; // Invalid type in namespace
+
+                        QQmlEnginePrivate *enginePrivate = QQmlEnginePrivate::get(engine);
+                        QQmlAttachedPropertiesFunc func = r.type.attachedPropertiesFunction(enginePrivate);
+                        if (!func) return; // Not an attachable type
+
+                        currentObject = qmlAttachedPropertiesObjectById(r.type.attachedPropertiesId(enginePrivate), currentObject);
+                        if (!currentObject) return; // Something is broken with the attachable type
+
+                    } else if (r.scriptIndex != -1) {
+                        return; // Not a type
+                    } else {
+                        Q_ASSERT(!"Unreachable");
+                    }
+                    continue;
                 }
-                continue;
+
             }
 
-        }
+            QQmlPropertyData local;
+            QQmlPropertyData *property =
+                    QQmlPropertyCache::property(engine, currentObject, pathName, context, local);
 
-        QQmlPropertyData local;
-        QQmlPropertyData *property =
-            QQmlPropertyCache::property(engine, currentObject, pathName, context, local);
+            if (!property) return; // Not a property
+            if (property->isFunction())
+                return; // Not an object property
 
-        if (!property) return; // Not a property
-        if (property->isFunction())
-            return; // Not an object property
+            if (ii == (path.count() - 2) && QQmlValueTypeFactory::isValueType(property->propType())) {
+                // We're now at a value type property
+                const QMetaObject *valueTypeMetaObject = QQmlValueTypeFactory::metaObjectForMetaType(property->propType());
+                if (!valueTypeMetaObject) return; // Not a value type
 
-        if (ii == (path.count() - 2) && QQmlValueTypeFactory::isValueType(property->propType())) {
-            // We're now at a value type property
-            const QMetaObject *valueTypeMetaObject = QQmlValueTypeFactory::metaObjectForMetaType(property->propType());
-            if (!valueTypeMetaObject) return; // Not a value type
+                int idx = valueTypeMetaObject->indexOfProperty(path.last().toUtf8().constData());
+                if (idx == -1) return; // Value type property does not exist
 
-            int idx = valueTypeMetaObject->indexOfProperty(path.last().toUtf8().constData());
-            if (idx == -1) return; // Value type property does not exist
+                QMetaProperty vtProp = valueTypeMetaObject->property(idx);
 
-            QMetaProperty vtProp = valueTypeMetaObject->property(idx);
+                Q_ASSERT(vtProp.userType() <= 0x0000FFFF);
+                Q_ASSERT(idx <= 0x0000FFFF);
 
-            Q_ASSERT(vtProp.userType() <= 0x0000FFFF);
-            Q_ASSERT(idx <= 0x0000FFFF);
+                object = currentObject;
+                core = *property;
+                valueTypeData.setFlags(QQmlPropertyData::flagsForProperty(vtProp));
+                valueTypeData.setPropType(vtProp.userType());
+                valueTypeData.setCoreIndex(idx);
 
-            object = currentObject;
-            core = *property;
-            valueTypeData.setFlags(QQmlPropertyData::flagsForProperty(vtProp));
-            valueTypeData.setPropType(vtProp.userType());
-            valueTypeData.setCoreIndex(idx);
+                return;
+            } else {
+                if (!property->isQObject())
+                    return; // Not an object property
 
-            return;
-        } else {
-            if (!property->isQObject())
-                return; // Not an object property
+                property->readProperty(currentObject, &currentObject);
+                if (!currentObject) return; // No value
 
-            property->readProperty(currentObject, &currentObject);
-            if (!currentObject) return; // No value
+            }
 
         }
 
+        terminal = path.last();
     }
 
-    const QStringRef &terminal = path.last();
-
     if (terminal.count() >= 3 &&
         terminal.at(0) == QLatin1Char('o') &&
         terminal.at(1) == QLatin1Char('n') &&
diff --git a/src/qml/qml/qqmlproperty_p.h b/src/qml/qml/qqmlproperty_p.h
index 53062a2f13..7a66d8113c 100644
--- a/src/qml/qml/qqmlproperty_p.h
+++ b/src/qml/qml/qqmlproperty_p.h
@@ -144,6 +144,8 @@ public:
     static void flushSignal(const QObject *sender, int signal_index);
 
     static QVariant resolvedUrlSequence(const QVariant &value, QQmlContextData *context);
+    static QQmlProperty create(QObject *target, const QString &propertyName, QQmlContextData *context);
+
 };
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(QQmlPropertyPrivate::BindingFlags)
diff --git a/src/qml/qml/qqmltypeloader.cpp b/src/qml/qml/qqmltypeloader.cpp
index a4db62eebf..4b6e69e617 100644
--- a/src/qml/qml/qqmltypeloader.cpp
+++ b/src/qml/qml/qqmltypeloader.cpp
@@ -356,8 +356,10 @@ qreal QQmlDataBlob::progress() const
 }
 
 /*!
-Returns the blob url passed to the constructor.  If a network redirect
-happens while fetching the data, this url remains the same.
+Returns the physical url of the data.  Initially this is the same as
+finalUrl(), but if a network redirect happens while fetching the data, this url
+is updated to reflect the new location. Also, if a URL interceptor is set, it
+will work on this URL and leave finalUrl() alone.
 
 \sa finalUrl()
 */
@@ -366,16 +368,25 @@ QUrl QQmlDataBlob::url() const
     return m_url;
 }
 
+QString QQmlDataBlob::urlString() const
+{
+    if (m_urlString.isEmpty())
+        m_urlString = m_url.toString();
+
+    return m_urlString;
+}
+
 /*!
-Returns the final url of the data.  Initially this is the same as
-url(), but if a network redirect happens while fetching the data, this url
-is updated to reflect the new location.
+Returns the logical URL to be used for resolving further URLs referred to in
+the code.
 
-May only be called from the load thread, or after the blob isCompleteOrError().
+This is the blob url passed to the constructor.  If a network redirect
+happens while fetching the data, this url remains the same.
+
+\sa url()
 */
 QUrl QQmlDataBlob::finalUrl() const
 {
-    Q_ASSERT(isCompleteOrError() || (m_typeLoader && m_typeLoader->m_thread->isThisThread()));
     return m_finalUrl;
 }
 
@@ -384,7 +395,6 @@ Returns the finalUrl() as a string.
 */
 QString QQmlDataBlob::finalUrlString() const
 {
-    Q_ASSERT(isCompleteOrError() || (m_typeLoader && m_typeLoader->m_thread->isThisThread()));
     if (m_finalUrlString.isEmpty())
         m_finalUrlString = m_finalUrl.toString();
 
@@ -433,7 +443,7 @@ void QQmlDataBlob::setError(const QList<QQmlError> &errors)
     m_data.setStatus(Error);
 
     if (dumpErrors()) {
-        qWarning().nospace() << "Errors for " << m_finalUrl.toString();
+        qWarning().nospace() << "Errors for " << urlString();
         for (int ii = 0; ii < errors.count(); ++ii)
             qWarning().nospace() << "    " << qPrintable(errors.at(ii).toString());
     }
@@ -472,7 +482,7 @@ void QQmlDataBlob::setError(const QString &description)
 {
     QQmlError e;
     e.setDescription(description);
-    e.setUrl(finalUrl());
+    e.setUrl(url());
     setError(e);
 }
 
@@ -537,7 +547,7 @@ void QQmlDataBlob::networkError(QNetworkReply::NetworkError networkError)
     Q_UNUSED(networkError);
 
     QQmlError error;
-    error.setUrl(m_finalUrl);
+    error.setUrl(m_url);
 
     const char *errorString = 0;
     switch (networkError) {
@@ -654,7 +664,7 @@ void QQmlDataBlob::tryDone()
         addref();
 
 #ifdef DATABLOB_DEBUG
-        qWarning("QQmlDataBlob::done() %s", qPrintable(url().toString()));
+        qWarning("QQmlDataBlob::done() %s", qPrintable(urlString()));
 #endif
         done();
 
@@ -893,7 +903,7 @@ void QQmlTypeLoaderThread::callCompletedMain(QQmlDataBlob *b)
 {
     QML_MEMORY_SCOPE_URL(b->url());
 #ifdef DATABLOB_DEBUG
-    qWarning("QQmlTypeLoaderThread: %s completed() callback", qPrintable(b->url().toString()));
+    qWarning("QQmlTypeLoaderThread: %s completed() callback", qPrintable(b->urlString()));
 #endif
     b->completed();
     b->release();
@@ -903,7 +913,7 @@ void QQmlTypeLoaderThread::callDownloadProgressChangedMain(QQmlDataBlob *b, qrea
 {
 #ifdef DATABLOB_DEBUG
     qWarning("QQmlTypeLoaderThread: %s downloadProgressChanged(%f) callback",
-             qPrintable(b->url().toString()), p);
+             qPrintable(b->urlString()), p);
 #endif
     b->downloadProgressChanged(p);
     b->release();
@@ -1037,7 +1047,7 @@ template<typename Loader>
 void QQmlTypeLoader::doLoad(const Loader &loader, QQmlDataBlob *blob, Mode mode)
 {
 #ifdef DATABLOB_DEBUG
-    qWarning("QQmlTypeLoader::doLoad(%s): %s thread", qPrintable(blob->m_url.toString()),
+    qWarning("QQmlTypeLoader::doLoad(%s): %s thread", qPrintable(blob->urlString()),
              m_thread->isThisThread()?"Compile":"Engine");
 #endif
     blob->startLoading();
@@ -1159,7 +1169,7 @@ void QQmlTypeLoader::loadThread(QQmlDataBlob *blob)
         }
 
 #ifdef DATABLOB_DEBUG
-        qWarning("QQmlDataBlob: requested %s", qPrintable(blob->url().toString()));
+        qWarning("QQmlDataBlob: requested %s", qPrintable(blob->urlString()));
 #endif // DATABLOB_DEBUG
 #endif // qml_network
     }
@@ -1185,14 +1195,15 @@ void QQmlTypeLoader::networkReplyFinished(QNetworkReply *reply)
         QVariant redirect = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
         if (redirect.isValid()) {
             QUrl url = reply->url().resolved(redirect.toUrl());
-            blob->m_finalUrl = url;
+            blob->m_url = url;
+            blob->m_urlString.clear();
 
             QNetworkReply *reply = m_thread->networkAccessManager()->get(QNetworkRequest(url));
             QObject *nrp = m_thread->networkReplyProxy();
             QObject::connect(reply, SIGNAL(finished()), nrp, SLOT(finished()));
             m_networkReplies.insert(reply, blob);
 #ifdef DATABLOB_DEBUG
-            qWarning("QQmlDataBlob: redirected to %s", qPrintable(blob->m_finalUrl.toString()));
+            qWarning("QQmlDataBlob: redirected to %s", qPrintable(blob->urlString()));
 #endif
             return;
         }
@@ -1348,7 +1359,7 @@ bool QQmlTypeLoader::Blob::fetchQmldir(const QUrl &url, const QV4::CompiledData:
 
 bool QQmlTypeLoader::Blob::updateQmldir(QQmlQmldirData *data, const QV4::CompiledData::Import *import, QList<QQmlError> *errors)
 {
-    QString qmldirIdentifier = data->url().toString();
+    QString qmldirIdentifier = data->urlString();
     QString qmldirUrl = qmldirIdentifier.left(qmldirIdentifier.lastIndexOf(QLatin1Char('/')) + 1);
 
     typeLoader()->setQmldirContent(qmldirIdentifier, data->content());
@@ -2104,7 +2115,7 @@ bool QQmlTypeData::tryLoadFromDiskCache()
     {
         QString error;
         if (!unit->loadFromDisk(url(), m_backupSourceCode.sourceTimeStamp(), v4->iselFactory.data(), &error)) {
-            qCDebug(DBG_DISK_CACHE) << "Error loading" << url().toString() << "from disk cache:" << error;
+            qCDebug(DBG_DISK_CACHE) << "Error loading" << urlString() << "from disk cache:" << error;
             return false;
         }
     }
@@ -2224,10 +2235,10 @@ void QQmlTypeData::done()
         if (script.script->isError()) {
             QList<QQmlError> errors = script.script->errors();
             QQmlError error;
-            error.setUrl(finalUrl());
+            error.setUrl(url());
             error.setLine(script.location.line);
             error.setColumn(script.location.column);
-            error.setDescription(QQmlTypeLoader::tr("Script %1 unavailable").arg(script.script->url().toString()));
+            error.setDescription(QQmlTypeLoader::tr("Script %1 unavailable").arg(script.script->urlString()));
             errors.prepend(error);
             setError(errors);
             return;
@@ -2244,7 +2255,7 @@ void QQmlTypeData::done()
 
             QList<QQmlError> errors = type.typeData->errors();
             QQmlError error;
-            error.setUrl(finalUrl());
+            error.setUrl(url());
             error.setLine(type.location.line);
             error.setColumn(type.location.column);
             error.setDescription(QQmlTypeLoader::tr("Type %1 unavailable").arg(typeName));
@@ -2263,7 +2274,7 @@ void QQmlTypeData::done()
 
             QList<QQmlError> errors = type.typeData->errors();
             QQmlError error;
-            error.setUrl(finalUrl());
+            error.setUrl(url());
             error.setLine(type.location.line);
             error.setColumn(type.location.column);
             error.setDescription(QQmlTypeLoader::tr("Type %1 unavailable").arg(typeName));
@@ -2293,7 +2304,7 @@ void QQmlTypeData::done()
 
     // verify if any dependencies changed if we're using a cache
     if (m_document.isNull() && !m_compiledData->verifyChecksum(dependencyHasher)) {
-        qCDebug(DBG_DISK_CACHE) << "Checksum mismatch for cached version of" << m_compiledData->url().toString();
+        qCDebug(DBG_DISK_CACHE) << "Checksum mismatch for cached version of" << m_compiledData->fileName();
         if (!loadFromSource())
             return;
         m_backupSourceCode = SourceCodeData();
@@ -2458,7 +2469,7 @@ bool QQmlTypeData::loadFromSource()
         errors.reserve(compiler.errors.count());
         for (const QQmlJS::DiagnosticMessage &msg : qAsConst(compiler.errors)) {
             QQmlError e;
-            e.setUrl(finalUrl());
+            e.setUrl(url());
             e.setLine(msg.loc.startLine);
             e.setColumn(msg.loc.startColumn);
             e.setDescription(msg.message);
@@ -2475,7 +2486,8 @@ 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.setFileName(urlString());
+    m_document->jsModule.setFinalUrl(finalUrlString());
     m_document->javaScriptCompilationUnit = unit;
     continueLoadFromIR();
 }
@@ -2598,7 +2610,7 @@ void QQmlTypeData::compile(const QQmlRefPointer<QQmlTypeNameCache> &typeNameCach
                 // ignore error, keep using the in-memory compilation unit.
             }
         } else {
-            qCDebug(DBG_DISK_CACHE) << "Error saving cached version of" << m_compiledData->url().toString() << "to disk:" << errorString;
+            qCDebug(DBG_DISK_CACHE) << "Error saving cached version of" << m_compiledData->fileName() << "to disk:" << errorString;
         }
     }
 }
@@ -2973,7 +2985,7 @@ void QQmlScriptBlob::dataReceived(const SourceCodeData &data)
             initializeFromCompilationUnit(unit);
             return;
         } else {
-            qCDebug(DBG_DISK_CACHE()) << "Error loading" << url().toString() << "from disk cache:" << error;
+            qCDebug(DBG_DISK_CACHE()) << "Error loading" << urlString() << "from disk cache:" << error;
         }
     }
 
@@ -2991,7 +3003,9 @@ 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, v4, urlString(), finalUrlString(),
+                source, &errors, &collector);
     // No need to addref on unit, it's initial refcount is 1
     source.clear();
     if (!errors.isEmpty()) {
@@ -3015,7 +3029,7 @@ void QQmlScriptBlob::dataReceived(const SourceCodeData &data)
     if (!disableDiskCache() || forceDiskCache()) {
         QString errorString;
         if (!unit->saveToDisk(url(), &errorString)) {
-            qCDebug(DBG_DISK_CACHE()) << "Error saving cached version of" << unit->url().toString() << "to disk:" << errorString;
+            qCDebug(DBG_DISK_CACHE()) << "Error saving cached version of" << unit->fileName() << "to disk:" << errorString;
         }
     }
 
@@ -3039,10 +3053,10 @@ void QQmlScriptBlob::done()
         if (script.script->isError()) {
             QList<QQmlError> errors = script.script->errors();
             QQmlError error;
-            error.setUrl(finalUrl());
+            error.setUrl(url());
             error.setLine(script.location.line);
             error.setColumn(script.location.column);
-            error.setDescription(QQmlTypeLoader::tr("Script %1 unavailable").arg(script.script->url().toString()));
+            error.setDescription(QQmlTypeLoader::tr("Script %1 unavailable").arg(script.script->urlString()));
             errors.prepend(error);
             setError(errors);
             return;
diff --git a/src/qml/qml/qqmltypeloader_p.h b/src/qml/qml/qqmltypeloader_p.h
index 22ac61968f..ab32bac7b2 100644
--- a/src/qml/qml/qqmltypeloader_p.h
+++ b/src/qml/qml/qqmltypeloader_p.h
@@ -129,6 +129,7 @@ public:
     qreal progress() const;
 
     QUrl url() const;
+    QString urlString() const;
     QUrl finalUrl() const;
     QString finalUrlString() const;
 
@@ -207,6 +208,7 @@ private:
 
     QUrl m_url;
     QUrl m_finalUrl;
+    mutable QString m_urlString;
     mutable QString m_finalUrlString;
 
     // List of QQmlDataBlob's that are waiting for me to complete.
diff --git a/src/qml/qml/qqmlvme.cpp b/src/qml/qml/qqmlvme.cpp
index c60f4edc80..72d4ab7e8f 100644
--- a/src/qml/qml/qqmlvme.cpp
+++ b/src/qml/qml/qqmlvme.cpp
@@ -120,18 +120,6 @@ void QQmlVMEGuard::guard(QQmlObjectCreator *creator)
     m_contexts[0] = creator->parentContextData();
 }
 
-void QQmlVMEGuard::unguard(QObject *object)
-{
-    for (int ii = 0; ii < m_objectCount; ++ii) {
-        if (m_objects[ii] == object) {
-            if (ii < m_objectCount - 1)
-                ::memmove((void *) m_objects[ii], (void *) m_objects[ii + 1], sizeof(QPointer<QObject> *));
-            delete m_objects[--m_objectCount];
-            break;
-        }
-    }
-}
-
 void QQmlVMEGuard::clear()
 {
     delete [] m_objects;
diff --git a/src/qml/qml/qqmlvme_p.h b/src/qml/qml/qqmlvme_p.h
index 9585b5b6df..99d63380ad 100644
--- a/src/qml/qml/qqmlvme_p.h
+++ b/src/qml/qml/qqmlvme_p.h
@@ -131,7 +131,6 @@ public:
     ~QQmlVMEGuard();
 
     void guard(QQmlObjectCreator *);
-    void unguard(QObject *);
     void clear();
 
     bool isOK() const;
diff --git a/src/qml/types/qqmldelegatemodel.cpp b/src/qml/types/qqmldelegatemodel.cpp
index dc41a16e3b..7a34bab2f5 100644
--- a/src/qml/types/qqmldelegatemodel.cpp
+++ b/src/qml/types/qqmldelegatemodel.cpp
@@ -864,7 +864,7 @@ void QQmlDelegateModelPrivate::releaseIncubator(QQDMIncubationTask *incubationTa
 
 void QQmlDelegateModelPrivate::removeCacheItem(QQmlDelegateModelItem *cacheItem)
 {
-    int cidx = m_cache.indexOf(cacheItem);
+    int cidx = m_cache.lastIndexOf(cacheItem);
     if (cidx >= 0) {
         m_compositor.clearFlags(Compositor::Cache, cidx, 1, Compositor::CacheFlag);
         m_cache.removeAt(cidx);
@@ -1021,11 +1021,11 @@ QObject *QQmlDelegateModelPrivate::object(Compositor::Group group, int index, QQ
 
 /*
   If asynchronous is true or the component is being loaded asynchronously due
-  to an ancestor being loaded asynchronously, item() may return 0.  In this
-  case createdItem() will be emitted when the item is available.  The item
-  at this stage does not have any references, so item() must be called again
-  to ensure a reference is held.  Any call to item() which returns a valid item
-  must be matched by a call to release() in order to destroy the item.
+  to an ancestor being loaded asynchronously, object() may return 0.  In this
+  case createdItem() will be emitted when the object is available.  The object
+  at this stage does not have any references, so object() must be called again
+  to ensure a reference is held.  Any call to object() which returns a valid object
+  must be matched by a call to release() in order to destroy the object.
 */
 QObject *QQmlDelegateModel::object(int index, QQmlIncubator::IncubationMode incubationMode)
 {