Update V8

Change-Id: I7a9da7dbb2116a441788407d60ed10155cded941
Reviewed-by: Kent Hansen <kent.hansen@nokia.com>

1 files changed, 0 insertions, 1856 deletions

diff --git a/src/v8/0005-Introduce-a-QML-compilation-mode.patch b/src/v8/0005-Introduce-a-QML-compilation-mode.patch
deleted file mode 100644
index c5c36a1f95..0000000000
--- a/src/v8/0005-Introduce-a-QML-compilation-mode.patch
+++ /dev/null
@@ -1,1856 +0,0 @@
-From 60c1a26bf89d3b06bcdd8408fcee89a018120f32 Mon Sep 17 00:00:00 2001
-From: Aaron Kennedy <aaron.kennedy@nokia.com>
-Date: Mon, 23 May 2011 18:26:19 +1000
-Subject: [PATCH 05/16] Introduce a QML compilation mode
-
-In QML mode, there is a second global object - known as the QML
-global object.  During property resolution, if a property is not
-present on the JS global object, it is resolve on the QML global
-object.
-
-This global object behavior is only enabled if a script is being
-compiled in QML mode.  The object to use as the QML global object
-is passed as a parameter to the Script::Run() method.  Any function
-closures etc. created during the run will retain a reference to this
-object, so different objects can be passed in different script
-runs.
----
- include/v8.h                     |   18 +++++++--
- src/api.cc                       |   52 ++++++++++++++++++++++-----
- src/arm/code-stubs-arm.cc        |    4 ++
- src/arm/full-codegen-arm.cc      |   26 ++++++++------
- src/arm/lithium-arm.cc           |    2 +-
- src/arm/lithium-arm.h            |    6 +++-
- src/arm/lithium-codegen-arm.cc   |    7 ++--
- src/arm/macro-assembler-arm.h    |    5 +++
- src/ast-inl.h                    |    5 +++
- src/ast.h                        |    1 +
- src/code-stubs.h                 |    2 +-
- src/compiler.cc                  |   15 +++++++-
- src/compiler.h                   |   22 +++++++++--
- src/contexts.cc                  |   35 ++++++++++++++++++
- src/contexts.h                   |    4 ++
- src/execution.cc                 |   28 ++++++++++++--
- src/execution.h                  |    6 +++
- src/full-codegen.cc              |    3 +-
- src/full-codegen.h               |    1 +
- src/heap.cc                      |    2 +
- src/hydrogen-instructions.h      |   10 ++++-
- src/hydrogen.cc                  |    2 +
- src/ia32/code-stubs-ia32.cc      |    7 ++++
- src/ia32/full-codegen-ia32.cc    |   26 ++++++++------
- src/ia32/lithium-codegen-ia32.cc |    7 ++--
- src/ia32/lithium-ia32.cc         |    2 +-
- src/ia32/lithium-ia32.h          |    6 +++-
- src/ia32/macro-assembler-ia32.h  |    5 +++
- src/objects-inl.h                |   12 ++++++
- src/objects.h                    |    5 +++
- src/parser.cc                    |   27 ++++++++++++--
- src/parser.h                     |    4 ++-
- src/prettyprinter.cc             |    3 ++
- src/runtime.cc                   |   72 ++++++++++++++++++++++++-------------
- src/runtime.h                    |    8 ++--
- src/scopes.cc                    |   59 +++++++++++++++++++++++++++++++
- src/scopes.h                     |    7 ++++
- src/variables.cc                 |    3 +-
- src/variables.h                  |    5 +++
- src/x64/code-stubs-x64.cc        |    4 ++
- src/x64/full-codegen-x64.cc      |   26 ++++++++------
- src/x64/lithium-codegen-x64.cc   |    7 ++--
- src/x64/lithium-x64.cc           |    2 +-
- src/x64/lithium-x64.h            |    6 +++
- src/x64/macro-assembler-x64.h    |    5 +++
- 45 files changed, 455 insertions(+), 109 deletions(-)
-
-diff --git a/include/v8.h b/include/v8.h
-index 205e856..d78ab1f 100644
---- a/include/v8.h
-+++ b/include/v8.h
-@@ -577,6 +577,10 @@ class ScriptOrigin {
-  */
- class V8EXPORT Script {
-  public:
-+  enum CompileFlags {
-+      Default = 0x00,
-+      QmlMode = 0x01
-+  };
- 
-   /**
-    * Compiles the specified script (context-independent).
-@@ -596,7 +600,8 @@ class V8EXPORT Script {
-   static Local<Script> New(Handle<String> source,
-                            ScriptOrigin* origin = NULL,
-                            ScriptData* pre_data = NULL,
--                           Handle<String> script_data = Handle<String>());
-+                           Handle<String> script_data = Handle<String>(),
-+                           CompileFlags = Default);
- 
-   /**
-    * Compiles the specified script using the specified file name
-@@ -609,7 +614,8 @@ class V8EXPORT Script {
-    *   will use the currently entered context).
-    */
-   static Local<Script> New(Handle<String> source,
--                           Handle<Value> file_name);
-+                           Handle<Value> file_name,
-+                           CompileFlags = Default);
- 
-   /**
-    * Compiles the specified script (bound to current context).
-@@ -630,7 +636,8 @@ class V8EXPORT Script {
-   static Local<Script> Compile(Handle<String> source,
-                                ScriptOrigin* origin = NULL,
-                                ScriptData* pre_data = NULL,
--                               Handle<String> script_data = Handle<String>());
-+                               Handle<String> script_data = Handle<String>(),
-+                               CompileFlags = Default);
- 
-   /**
-    * Compiles the specified script using the specified file name
-@@ -647,7 +654,8 @@ class V8EXPORT Script {
-    */
-   static Local<Script> Compile(Handle<String> source,
-                                Handle<Value> file_name,
--                               Handle<String> script_data = Handle<String>());
-+                               Handle<String> script_data = Handle<String>(),
-+                               CompileFlags = Default);
- 
-   /**
-    * Runs the script returning the resulting value.  If the script is
-@@ -657,6 +665,7 @@ class V8EXPORT Script {
-    * compiled.
-    */
-   Local<Value> Run();
-+  Local<Value> Run(Handle<Object> qml);
- 
-   /**
-    * Returns the script id value.
-@@ -3327,6 +3336,7 @@ class V8EXPORT Context {
-    * JavaScript frames an empty handle is returned.
-    */
-   static Local<Context> GetCalling();
-+  static Local<Object> GetCallingQmlGlobal();
- 
-   /**
-    * Sets the security token for the context.  To access an object in
-diff --git a/src/api.cc b/src/api.cc
-index 1a6fbbb..39767f4 100644
---- a/src/api.cc
-+++ b/src/api.cc
-@@ -1372,7 +1372,8 @@ ScriptData* ScriptData::New(const char* data, int length) {
- Local<Script> Script::New(v8::Handle<String> source,
-                           v8::ScriptOrigin* origin,
-                           v8::ScriptData* pre_data,
--                          v8::Handle<String> script_data) {
-+                          v8::Handle<String> script_data,
-+                          v8::Script::CompileFlags compile_flags) {
-   i::Isolate* isolate = i::Isolate::Current();
-   ON_BAILOUT(isolate, "v8::Script::New()", return Local<Script>());
-   LOG_API(isolate, "Script::New");
-@@ -1409,7 +1410,8 @@ Local<Script> Script::New(v8::Handle<String> source,
-                            NULL,
-                            pre_data_impl,
-                            Utils::OpenHandle(*script_data),
--                           i::NOT_NATIVES_CODE);
-+                           i::NOT_NATIVES_CODE,
-+                           compile_flags);
-   has_pending_exception = result.is_null();
-   EXCEPTION_BAILOUT_CHECK(isolate, Local<Script>());
-   return Local<Script>(ToApi<Script>(result));
-@@ -1417,21 +1419,23 @@ Local<Script> Script::New(v8::Handle<String> source,
- 
- 
- Local<Script> Script::New(v8::Handle<String> source,
--                          v8::Handle<Value> file_name) {
-+                          v8::Handle<Value> file_name, 
-+                          v8::Script::CompileFlags compile_flags) {
-   ScriptOrigin origin(file_name);
--  return New(source, &origin);
-+  return New(source, &origin, 0, Handle<String>(), compile_flags);
- }
- 
- 
- Local<Script> Script::Compile(v8::Handle<String> source,
-                               v8::ScriptOrigin* origin,
-                               v8::ScriptData* pre_data,
--                              v8::Handle<String> script_data) {
-+                              v8::Handle<String> script_data,
-+                              v8::Script::CompileFlags compile_flags) {
-   i::Isolate* isolate = i::Isolate::Current();
-   ON_BAILOUT(isolate, "v8::Script::Compile()", return Local<Script>());
-   LOG_API(isolate, "Script::Compile");
-   ENTER_V8(isolate);
--  Local<Script> generic = New(source, origin, pre_data, script_data);
-+  Local<Script> generic = New(source, origin, pre_data, script_data, compile_flags);
-   if (generic.IsEmpty())
-     return generic;
-   i::Handle<i::Object> obj = Utils::OpenHandle(*generic);
-@@ -1447,13 +1451,18 @@ Local<Script> Script::Compile(v8::Handle<String> source,
- 
- Local<Script> Script::Compile(v8::Handle<String> source,
-                               v8::Handle<Value> file_name,
--                              v8::Handle<String> script_data) {
-+                              v8::Handle<String> script_data,
-+                              v8::Script::CompileFlags compile_flags) {
-   ScriptOrigin origin(file_name);
--  return Compile(source, &origin, 0, script_data);
-+  return Compile(source, &origin, 0, script_data, compile_flags);
- }
- 
- 
- Local<Value> Script::Run() {
-+    return Run(Handle<Object>());
-+}
-+
-+Local<Value> Script::Run(Handle<Object> qml) {
-   i::Isolate* isolate = i::Isolate::Current();
-   ON_BAILOUT(isolate, "v8::Script::Run()", return Local<Value>());
-   LOG_API(isolate, "Script::Run");
-@@ -1472,10 +1481,11 @@ Local<Value> Script::Run() {
-       fun = i::Handle<i::JSFunction>(i::JSFunction::cast(*obj), isolate);
-     }
-     EXCEPTION_PREAMBLE(isolate);
-+    i::Handle<i::Object> qmlglobal = Utils::OpenHandle(*qml);
-     i::Handle<i::Object> receiver(
-         isolate->context()->global_proxy(), isolate);
-     i::Handle<i::Object> result =
--        i::Execution::Call(fun, receiver, 0, NULL, &has_pending_exception);
-+        i::Execution::Call(fun, receiver, 0, NULL, &has_pending_exception, qmlglobal);
-     EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
-     raw_result = *result;
-   }
-@@ -3943,6 +3953,30 @@ v8::Local<v8::Context> Context::GetCalling() {
- }
- 
- 
-+v8::Local<v8::Object> Context::GetCallingQmlGlobal() {
-+  i::Isolate* isolate = i::Isolate::Current();
-+  if (IsDeadCheck(isolate, "v8::Context::GetCallingQmlGlobal()")) {
-+    return Local<Object>();
-+  }
-+
-+  i::Context *context = isolate->context();
-+  if (!context->qml_global()->IsUndefined()) {
-+    i::Handle<i::Object> qmlglobal(context->qml_global());
-+    return Utils::ToLocal(i::Handle<i::JSObject>::cast(qmlglobal));
-+  }
-+
-+  i::JavaScriptFrameIterator it;
-+  if (it.done()) return Local<Object>();
-+  context = i::Context::cast(it.frame()->context());
-+  if (!context->qml_global()->IsUndefined()) {
-+    i::Handle<i::Object> qmlglobal(context->qml_global());
-+    return Utils::ToLocal(i::Handle<i::JSObject>::cast(qmlglobal));
-+  } else {
-+      return Local<Object>();
-+  }
-+}
-+
-+
- v8::Local<v8::Object> Context::Global() {
-   if (IsDeadCheck(i::Isolate::Current(), "v8::Context::Global()")) {
-     return Local<v8::Object>();
-diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
-index 8c147f9..a2626bf 100644
---- a/src/arm/code-stubs-arm.cc
-+++ b/src/arm/code-stubs-arm.cc
-@@ -166,6 +166,10 @@ void FastNewContextStub::Generate(MacroAssembler* masm) {
-   __ ldr(r1, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
-   __ str(r1, MemOperand(r0, Context::SlotOffset(Context::GLOBAL_INDEX)));
- 
-+  // Copy the qml global object from the surrounding context.
-+  __ ldr(r1, MemOperand(cp, Context::SlotOffset(Context::QML_GLOBAL_INDEX)));
-+  __ str(r1, MemOperand(r0, Context::SlotOffset(Context::QML_GLOBAL_INDEX)));
-+
-   // Initialize the rest of the slots to undefined.
-   __ LoadRoot(r1, Heap::kUndefinedValueRootIndex);
-   for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) {
-diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
-index 871b453..a69f10d 100644
---- a/src/arm/full-codegen-arm.cc
-+++ b/src/arm/full-codegen-arm.cc
-@@ -154,12 +154,13 @@ void FullCodeGenerator::Generate(CompilationInfo* info) {
- 
-   // Possibly allocate a local context.
-   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
--  if (heap_slots > 0) {
-+  if (heap_slots > 0 ||
-+      (scope()->is_qml_mode() && scope()->is_global_scope())) {
-     Comment cmnt(masm_, "[ Allocate local context");
-     // Argument to NewContext is the function, which is in r1.
-     __ push(r1);
-     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
--      FastNewContextStub stub(heap_slots);
-+      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
-       __ CallStub(&stub);
-     } else {
-       __ CallRuntime(Runtime::kNewContext, 1);
-@@ -1247,9 +1248,9 @@ void FullCodeGenerator::EmitLoadGlobalSlotCheckExtensions(
-     __ bind(&fast);
-   }
- 
--  __ ldr(r0, GlobalObjectOperand());
-+  __ ldr(r0, slot->var()->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
-   __ mov(r2, Operand(slot->var()->name()));
--  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF)
-+  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF || slot->var()->is_qml_global())
-       ? RelocInfo::CODE_TARGET
-       : RelocInfo::CODE_TARGET_CONTEXT;
-   Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
-@@ -1268,10 +1269,10 @@ void FullCodeGenerator::EmitVariableLoad(Variable* var) {
-     Comment cmnt(masm_, "Global variable");
-     // Use inline caching. Variable name is passed in r2 and the global
-     // object (receiver) in r0.
--    __ ldr(r0, GlobalObjectOperand());
-+    __ ldr(r0, var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
-     __ mov(r2, Operand(var->name()));
-     Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
--    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
-+    EmitCallIC(ic, var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
-     context()->Plug(r0);
- 
-   } else if (slot != NULL && slot->type() == Slot::LOOKUP) {
-@@ -1893,11 +1894,11 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
-     // assignment.  Right-hand-side value is passed in r0, variable name in
-     // r2, and the global object in r1.
-     __ mov(r2, Operand(var->name()));
--    __ ldr(r1, GlobalObjectOperand());
-+    __ ldr(r1, var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
-     Handle<Code> ic = is_strict_mode()
-         ? isolate()->builtins()->StoreIC_Initialize_Strict()
-         : isolate()->builtins()->StoreIC_Initialize();
--    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
-+    EmitCallIC(ic, var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
- 
-   } else if (op == Token::INIT_CONST) {
-     // Like var declarations, const declarations are hoisted to function
-@@ -2184,10 +2185,13 @@ void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
-   // Push the strict mode flag.
-   __ mov(r1, Operand(Smi::FromInt(strict_mode_flag())));
-   __ push(r1);
-+  // Push the qml mode flag.
-+  __ mov(r1, Operand(Smi::FromInt(is_qml_mode())));
-+  __ push(r1);
- 
-   __ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
-                  ? Runtime::kResolvePossiblyDirectEvalNoLookup
--                 : Runtime::kResolvePossiblyDirectEval, 4);
-+                 : Runtime::kResolvePossiblyDirectEval, 5);
- }
- 
- 
-@@ -2263,9 +2267,9 @@ void FullCodeGenerator::VisitCall(Call* expr) {
-     context()->DropAndPlug(1, r0);
-   } else if (var != NULL && !var->is_this() && var->is_global()) {
-     // Push global object as receiver for the call IC.
--    __ ldr(r0, GlobalObjectOperand());
-+    __ ldr(r0, var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
-     __ push(r0);
--    EmitCallWithIC(expr, var->name(), RelocInfo::CODE_TARGET_CONTEXT);
-+    EmitCallWithIC(expr, var->name(), var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
-   } else if (var != NULL && var->AsSlot() != NULL &&
-              var->AsSlot()->type() == Slot::LOOKUP) {
-     // Call to a lookup slot (dynamically introduced variable).
-diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
-index 3f1d15b..8406a96 100644
---- a/src/arm/lithium-arm.cc
-+++ b/src/arm/lithium-arm.cc
-@@ -1195,7 +1195,7 @@ LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
- 
- LInstruction* LChunkBuilder::DoGlobalObject(HGlobalObject* instr) {
-   LOperand* context = UseRegisterAtStart(instr->value());
--  return DefineAsRegister(new LGlobalObject(context));
-+  return DefineAsRegister(new LGlobalObject(context, instr->qml_global()));
- }
- 
- 
-diff --git a/src/arm/lithium-arm.h b/src/arm/lithium-arm.h
-index 6da7c86..10b901f 100644
---- a/src/arm/lithium-arm.h
-+++ b/src/arm/lithium-arm.h
-@@ -1378,13 +1378,17 @@ class LOuterContext: public LTemplateInstruction<1, 1, 0> {
- 
- class LGlobalObject: public LTemplateInstruction<1, 1, 0> {
-  public:
--  explicit LGlobalObject(LOperand* context) {
-+  explicit LGlobalObject(LOperand* context, bool qml_global) {
-     inputs_[0] = context;
-+    qml_global_ = qml_global;
-   }
- 
-   DECLARE_CONCRETE_INSTRUCTION(GlobalObject, "global-object")
- 
-   LOperand* context() { return InputAt(0); }
-+  bool qml_global() { return qml_global_; }
-+ private:
-+  bool qml_global_;
- };
- 
- 
-diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
-index 4912449..db114ea 100644
---- a/src/arm/lithium-codegen-arm.cc
-+++ b/src/arm/lithium-codegen-arm.cc
-@@ -166,12 +166,13 @@ bool LCodeGen::GeneratePrologue() {
- 
-   // Possibly allocate a local context.
-   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
--  if (heap_slots > 0) {
-+  if (heap_slots > 0 ||
-+      (scope()->is_qml_mode() && scope()->is_global_scope())) {
-     Comment(";;; Allocate local context");
-     // Argument to NewContext is the function, which is in r1.
-     __ push(r1);
-     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
--      FastNewContextStub stub(heap_slots);
-+      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
-       __ CallStub(&stub);
-     } else {
-       __ CallRuntime(Runtime::kNewContext, 1);
-@@ -2664,7 +2665,7 @@ void LCodeGen::DoOuterContext(LOuterContext* instr) {
- void LCodeGen::DoGlobalObject(LGlobalObject* instr) {
-   Register context = ToRegister(instr->context());
-   Register result = ToRegister(instr->result());
--  __ ldr(result, ContextOperand(cp, Context::GLOBAL_INDEX));
-+  __ ldr(result, ContextOperand(cp, instr->qml_global()?Context::QML_GLOBAL_INDEX:Context::GLOBAL_INDEX));
- }
- 
- 
-diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
-index ab5efb0..d40cdbc 100644
---- a/src/arm/macro-assembler-arm.h
-+++ b/src/arm/macro-assembler-arm.h
-@@ -1056,6 +1056,11 @@ static inline MemOperand GlobalObjectOperand()  {
- }
- 
- 
-+static inline MemOperand QmlGlobalObjectOperand()  {
-+  return ContextOperand(cp, Context::QML_GLOBAL_INDEX);
-+}
-+
-+
- #ifdef GENERATED_CODE_COVERAGE
- #define CODE_COVERAGE_STRINGIFY(x) #x
- #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
-diff --git a/src/ast-inl.h b/src/ast-inl.h
-index d80684a..adc5a1f 100644
---- a/src/ast-inl.h
-+++ b/src/ast-inl.h
-@@ -106,6 +106,11 @@ bool FunctionLiteral::strict_mode() const {
- }
- 
- 
-+bool FunctionLiteral::qml_mode() const {
-+  return scope()->is_qml_mode();
-+}
-+
-+
- } }  // namespace v8::internal
- 
- #endif  // V8_AST_INL_H_
-diff --git a/src/ast.h b/src/ast.h
-index 65a25a9..f790dc0 100644
---- a/src/ast.h
-+++ b/src/ast.h
-@@ -1712,6 +1712,7 @@ class FunctionLiteral: public Expression {
-   int end_position() const { return end_position_; }
-   bool is_expression() const { return is_expression_; }
-   bool strict_mode() const;
-+  bool qml_mode() const;
- 
-   int materialized_literal_count() { return materialized_literal_count_; }
-   int expected_property_count() { return expected_property_count_; }
-diff --git a/src/code-stubs.h b/src/code-stubs.h
-index 56ef072..37e5383 100644
---- a/src/code-stubs.h
-+++ b/src/code-stubs.h
-@@ -303,7 +303,7 @@ class FastNewContextStub : public CodeStub {
-   static const int kMaximumSlots = 64;
- 
-   explicit FastNewContextStub(int slots) : slots_(slots) {
--    ASSERT(slots_ > 0 && slots <= kMaximumSlots);
-+    ASSERT(slots_ >= 0 && slots <= kMaximumSlots);
-   }
- 
-   void Generate(MacroAssembler* masm);
-diff --git a/src/compiler.cc b/src/compiler.cc
-index 86d5de3..d2191b9 100755
---- a/src/compiler.cc
-+++ b/src/compiler.cc
-@@ -462,7 +462,8 @@ Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source,
-                                              v8::Extension* extension,
-                                              ScriptDataImpl* input_pre_data,
-                                              Handle<Object> script_data,
--                                             NativesFlag natives) {
-+                                             NativesFlag natives,
-+                                             v8::Script::CompileFlags compile_flags) {
-   Isolate* isolate = source->GetIsolate();
-   int source_length = source->length();
-   isolate->counters()->total_load_size()->Increment(source_length);
-@@ -523,6 +524,7 @@ Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source,
-     info.MarkAsGlobal();
-     info.SetExtension(extension);
-     info.SetPreParseData(pre_data);
-+    if (compile_flags & v8::Script::QmlMode) info.MarkAsQmlMode();
-     if (natives == NATIVES_CODE) info.MarkAsAllowingNativesSyntax();
-     result = MakeFunctionInfo(&info);
-     if (extension == NULL && !result.is_null()) {
-@@ -543,7 +545,8 @@ Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source,
- Handle<SharedFunctionInfo> Compiler::CompileEval(Handle<String> source,
-                                                  Handle<Context> context,
-                                                  bool is_global,
--                                                 StrictModeFlag strict_mode) {
-+                                                 StrictModeFlag strict_mode,
-+                                                 bool qml_mode) {
-   Isolate* isolate = source->GetIsolate();
-   int source_length = source->length();
-   isolate->counters()->total_eval_size()->Increment(source_length);
-@@ -567,6 +570,7 @@ Handle<SharedFunctionInfo> Compiler::CompileEval(Handle<String> source,
-     CompilationInfo info(script);
-     info.MarkAsEval();
-     if (is_global) info.MarkAsGlobal();
-+    if (qml_mode) info.MarkAsQmlMode();
-     if (strict_mode == kStrictMode) info.MarkAsStrictMode();
-     info.SetCallingContext(context);
-     result = MakeFunctionInfo(&info);
-@@ -610,6 +614,12 @@ bool Compiler::CompileLazy(CompilationInfo* info) {
-       info->MarkAsStrictMode();
-     }
- 
-+    // After parsing we know function's qml mode. Remember it.
-+    if (info->function()->qml_mode()) {
-+      shared->set_qml_mode(true);
-+      info->MarkAsQmlMode();
-+    }
-+
-     // Compile the code.
-     if (!MakeCode(info)) {
-       if (!isolate->has_pending_exception()) {
-@@ -755,6 +765,7 @@ void Compiler::SetFunctionInfo(Handle<SharedFunctionInfo> function_info,
-       *lit->this_property_assignments());
-   function_info->set_allows_lazy_compilation(lit->AllowsLazyCompilation());
-   function_info->set_strict_mode(lit->strict_mode());
-+  function_info->set_qml_mode(lit->qml_mode());
- }
- 
- 
-diff --git a/src/compiler.h b/src/compiler.h
-index e75e869..17cd369 100644
---- a/src/compiler.h
-+++ b/src/compiler.h
-@@ -54,6 +54,7 @@ class CompilationInfo BASE_EMBEDDED {
-   bool is_global() const { return (flags_ & IsGlobal::mask()) != 0; }
-   bool is_strict_mode() const { return (flags_ & IsStrictMode::mask()) != 0; }
-   bool is_in_loop() const { return (flags_ & IsInLoop::mask()) != 0; }
-+  bool is_qml_mode() const { return (flags_ & IsQmlMode::mask()) != 0; }
-   FunctionLiteral* function() const { return function_; }
-   Scope* scope() const { return scope_; }
-   Handle<Code> code() const { return code_; }
-@@ -83,6 +84,9 @@ class CompilationInfo BASE_EMBEDDED {
-     ASSERT(is_lazy());
-     flags_ |= IsInLoop::encode(true);
-   }
-+  void MarkAsQmlMode() {
-+    flags_ |= IsQmlMode::encode(true);
-+  }
-   void MarkAsAllowingNativesSyntax() {
-     flags_ |= IsNativesSyntaxAllowed::encode(true);
-   }
-@@ -141,6 +145,7 @@ class CompilationInfo BASE_EMBEDDED {
- 
-   // Determine whether or not we can adaptively optimize.
-   bool AllowOptimize() {
-+    // XXX - fix qml mode optimizations
-     return V8::UseCrankshaft() && !closure_.is_null();
-   }
- 
-@@ -163,8 +168,13 @@ class CompilationInfo BASE_EMBEDDED {
- 
-   void Initialize(Mode mode) {
-     mode_ = V8::UseCrankshaft() ? mode : NONOPT;
--    if (!shared_info_.is_null() && shared_info_->strict_mode()) {
--      MarkAsStrictMode();
-+    if (!shared_info_.is_null()) {
-+      if (shared_info_->strict_mode()) {
-+        MarkAsStrictMode();
-+      }
-+      if (shared_info_->qml_mode()) {
-+        MarkAsQmlMode();
-+      }
-     }
-   }
- 
-@@ -187,6 +197,8 @@ class CompilationInfo BASE_EMBEDDED {
-   class IsStrictMode: public BitField<bool, 4, 1> {};
-   // Native syntax (%-stuff) allowed?
-   class IsNativesSyntaxAllowed: public BitField<bool, 5, 1> {};
-+  // Qml mode
-+  class IsQmlMode: public BitField<bool, 6, 1> {};
- 
-   unsigned flags_;
- 
-@@ -252,13 +264,15 @@ class Compiler : public AllStatic {
-                                             v8::Extension* extension,
-                                             ScriptDataImpl* pre_data,
-                                             Handle<Object> script_data,
--                                            NativesFlag is_natives_code);
-+                                            NativesFlag is_natives_code,
-+                                            v8::Script::CompileFlags compile_flags = v8::Script::Default);
- 
-   // Compile a String source within a context for Eval.
-   static Handle<SharedFunctionInfo> CompileEval(Handle<String> source,
-                                                 Handle<Context> context,
-                                                 bool is_global,
--                                                StrictModeFlag strict_mode);
-+                                                StrictModeFlag strict_mode,
-+                                                bool qml_mode);
- 
-   // Compile from function info (used for lazy compilation). Returns true on
-   // success and false if the compilation resulted in a stack overflow.
-diff --git a/src/contexts.cc b/src/contexts.cc
-index 520f3dd..035ac3b 100644
---- a/src/contexts.cc
-+++ b/src/contexts.cc
-@@ -89,6 +89,9 @@ Handle<Object> Context::Lookup(Handle<String> name, ContextLookupFlags flags,
-     PrintF(")\n");
-   }
- 
-+  Handle<JSObject> qml_global;
-+  Handle<JSObject> qml_global_global;
-+
-   do {
-     if (FLAG_trace_contexts) {
-       PrintF(" - looking in context %p", reinterpret_cast<void*>(*context));
-@@ -119,6 +122,11 @@ Handle<Object> Context::Lookup(Handle<String> name, ContextLookupFlags flags,
-       }
-     }
- 
-+    if (qml_global.is_null() && !context->qml_global()->IsUndefined()) {
-+      qml_global = Handle<JSObject>(context->qml_global(), isolate);
-+      qml_global_global = Handle<JSObject>(context->global(), isolate);
-+    }
-+
-     if (context->is_function_context()) {
-       // we have context-local slots
- 
-@@ -198,6 +206,33 @@ Handle<Object> Context::Lookup(Handle<String> name, ContextLookupFlags flags,
-     }
-   } while (follow_context_chain);
- 
-+  if (!qml_global.is_null()) {
-+    if ((flags & FOLLOW_PROTOTYPE_CHAIN) == 0) {
-+      *attributes = qml_global_global->GetLocalPropertyAttribute(*name);
-+    } else {
-+      *attributes = qml_global_global->GetPropertyAttribute(*name);
-+    }
-+
-+    if (*attributes != ABSENT) {
-+      *attributes = ABSENT;
-+    } else {
-+      if ((flags & FOLLOW_PROTOTYPE_CHAIN) == 0) {
-+        *attributes = qml_global->GetLocalPropertyAttribute(*name);
-+      } else {
-+        *attributes = qml_global->GetPropertyAttribute(*name);
-+      }
-+
-+      if (*attributes != ABSENT) {
-+        // property found
-+        if (FLAG_trace_contexts) {
-+          PrintF("=> found property in qml global object %p\n",
-+                 reinterpret_cast<void*>(*qml_global));
-+        }
-+        return qml_global;
-+      }
-+    }
-+  }
-+
-   // slot not found
-   if (FLAG_trace_contexts) {
-     PrintF("=> no property/slot found\n");
-diff --git a/src/contexts.h b/src/contexts.h
-index e46619e..57d8e7b 100644
---- a/src/contexts.h
-+++ b/src/contexts.h
-@@ -182,6 +182,7 @@ class Context: public FixedArray {
-     FCONTEXT_INDEX,
-     PREVIOUS_INDEX,
-     EXTENSION_INDEX,
-+    QML_GLOBAL_INDEX,
-     GLOBAL_INDEX,
-     MIN_CONTEXT_SLOTS,
- 
-@@ -273,6 +274,9 @@ class Context: public FixedArray {
-   }
-   void set_global(GlobalObject* global) { set(GLOBAL_INDEX, global); }
- 
-+  JSObject *qml_global() { return reinterpret_cast<JSObject *>(get(QML_GLOBAL_INDEX)); }
-+  void set_qml_global(JSObject *qml_global) { set(QML_GLOBAL_INDEX, qml_global); }
-+
-   // Returns a JSGlobalProxy object or null.
-   JSObject* global_proxy();
-   void set_global_proxy(JSObject* global);
-diff --git a/src/execution.cc b/src/execution.cc
-index eb26438..1632076 100644
---- a/src/execution.cc
-+++ b/src/execution.cc
-@@ -70,7 +70,8 @@ static Handle<Object> Invoke(bool construct,
-                              Handle<Object> receiver,
-                              int argc,
-                              Object*** args,
--                             bool* has_pending_exception) {
-+                             bool* has_pending_exception,
-+                             Handle<Object> qml) {
-   Isolate* isolate = func->GetIsolate();
- 
-   // Entering JavaScript.
-@@ -107,6 +108,12 @@ static Handle<Object> Invoke(bool construct,
-   // make the current one is indeed a global object.
-   ASSERT(func->context()->global()->IsGlobalObject());
- 
-+  Handle<JSObject> oldqml;
-+  if (!qml.is_null()) {
-+    oldqml = Handle<JSObject>(func->context()->qml_global());
-+    func->context()->set_qml_global(JSObject::cast(*qml));
-+  }
-+
-   {
-     // Save and restore context around invocation and block the
-     // allocation of handles without explicit handle scopes.
-@@ -122,6 +129,9 @@ static Handle<Object> Invoke(bool construct,
-                                 receiver_pointer, argc, args);
-   }
- 
-+  if (!qml.is_null()) 
-+    func->context()->set_qml_global(*oldqml);
-+
- #ifdef DEBUG
-   value->Verify();
- #endif
-@@ -150,14 +160,24 @@ Handle<Object> Execution::Call(Handle<JSFunction> func,
-                                int argc,
-                                Object*** args,
-                                bool* pending_exception) {
--  return Invoke(false, func, receiver, argc, args, pending_exception);
-+  return Invoke(false, func, receiver, argc, args, pending_exception, Handle<Object>());
-+}
-+
-+
-+Handle<Object> Execution::Call(Handle<JSFunction> func,
-+                               Handle<Object> receiver,
-+                               int argc,
-+                               Object*** args,
-+                               bool* pending_exception,
-+                               Handle<Object> qml) {
-+  return Invoke(false, func, receiver, argc, args, pending_exception, qml);
- }
- 
- 
- Handle<Object> Execution::New(Handle<JSFunction> func, int argc,
-                               Object*** args, bool* pending_exception) {
-   return Invoke(true, func, Isolate::Current()->global(), argc, args,
--                pending_exception);
-+                pending_exception, Handle<Object>());
- }
- 
- 
-@@ -175,7 +195,7 @@ Handle<Object> Execution::TryCall(Handle<JSFunction> func,
-   catcher.SetCaptureMessage(false);
- 
-   Handle<Object> result = Invoke(false, func, receiver, argc, args,
--                                 caught_exception);
-+                                 caught_exception, Handle<Object>());
- 
-   if (*caught_exception) {
-     ASSERT(catcher.HasCaught());
-diff --git a/src/execution.h b/src/execution.h
-index d4b80d2..a476eb4 100644
---- a/src/execution.h
-+++ b/src/execution.h
-@@ -56,6 +56,12 @@ class Execution : public AllStatic {
-                              int argc,
-                              Object*** args,
-                              bool* pending_exception);
-+  static Handle<Object> Call(Handle<JSFunction> func,
-+                             Handle<Object> receiver,
-+                             int argc,
-+                             Object*** args,
-+                             bool* pending_exception,
-+                             Handle<Object> qml);
- 
-   // Construct object from function, the caller supplies an array of
-   // arguments. Arguments are Object* type. After function returns,
-diff --git a/src/full-codegen.cc b/src/full-codegen.cc
-index d6ba56e..2eaef0f 100644
---- a/src/full-codegen.cc
-+++ b/src/full-codegen.cc
-@@ -542,7 +542,7 @@ void FullCodeGenerator::VisitDeclarations(
-   // Do nothing in case of no declared global functions or variables.
-   if (globals > 0) {
-     Handle<FixedArray> array =
--        isolate()->factory()->NewFixedArray(2 * globals, TENURED);
-+        isolate()->factory()->NewFixedArray(3 * globals, TENURED);
-     for (int j = 0, i = 0; i < length; i++) {
-       Declaration* decl = declarations->at(i);
-       Variable* var = decl->proxy()->var();
-@@ -567,6 +567,7 @@ void FullCodeGenerator::VisitDeclarations(
-           }
-           array->set(j++, *function);
-         }
-+        array->set(j++, Smi::FromInt(var->is_qml_global()));
-       }
-     }
-     // Invoke the platform-dependent code generator to do the actual
-diff --git a/src/full-codegen.h b/src/full-codegen.h
-index d6ed1b9..e3241aa 100644
---- a/src/full-codegen.h
-+++ b/src/full-codegen.h
-@@ -505,6 +505,7 @@ class FullCodeGenerator: public AstVisitor {
-   StrictModeFlag strict_mode_flag() {
-     return is_strict_mode() ? kStrictMode : kNonStrictMode;
-   }
-+  bool is_qml_mode() { return function()->qml_mode(); }
-   FunctionLiteral* function() { return info_->function(); }
-   Scope* scope() { return info_->scope(); }
- 
-diff --git a/src/heap.cc b/src/heap.cc
-index bf2940e..da958c2 100644
---- a/src/heap.cc
-+++ b/src/heap.cc
-@@ -3795,6 +3795,7 @@ MaybeObject* Heap::AllocateFunctionContext(int length, JSFunction* function) {
-   context->set_previous(NULL);
-   context->set_extension(NULL);
-   context->set_global(function->context()->global());
-+  context->set_qml_global(function->context()->qml_global());
-   ASSERT(!context->IsGlobalContext());
-   ASSERT(context->is_function_context());
-   ASSERT(result->IsContext());
-@@ -3817,6 +3818,7 @@ MaybeObject* Heap::AllocateWithContext(Context* previous,
-   context->set_previous(previous);
-   context->set_extension(extension);
-   context->set_global(previous->global());
-+  context->set_qml_global(previous->qml_global());
-   ASSERT(!context->IsGlobalContext());
-   ASSERT(!context->is_function_context());
-   ASSERT(result->IsContext());
-diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
-index a623775..52455bc 100644
---- a/src/hydrogen-instructions.h
-+++ b/src/hydrogen-instructions.h
-@@ -1148,7 +1148,7 @@ class HOuterContext: public HUnaryOperation {
- 
- class HGlobalObject: public HUnaryOperation {
-  public:
--  explicit HGlobalObject(HValue* context) : HUnaryOperation(context) {
-+  explicit HGlobalObject(HValue* context) : HUnaryOperation(context), qml_global_(false) {
-     set_representation(Representation::Tagged());
-     SetFlag(kUseGVN);
-   }
-@@ -1159,8 +1159,14 @@ class HGlobalObject: public HUnaryOperation {
-     return Representation::Tagged();
-   }
- 
-+  bool qml_global() { return qml_global_; }
-+  void set_qml_global(bool v) { qml_global_ = v; }
-+
-  protected:
-   virtual bool DataEquals(HValue* other) { return true; }
-+
-+ private:
-+  bool qml_global_;
- };
- 
- 
-@@ -1177,7 +1183,7 @@ class HGlobalReceiver: public HUnaryOperation {
-   virtual Representation RequiredInputRepresentation(int index) const {
-     return Representation::Tagged();
-   }
--
-+  
-  protected:
-   virtual bool DataEquals(HValue* other) { return true; }
- };
-diff --git a/src/hydrogen.cc b/src/hydrogen.cc
-index 73ea97d..d17e304 100644
---- a/src/hydrogen.cc
-+++ b/src/hydrogen.cc
-@@ -2918,6 +2918,7 @@ void HGraphBuilder::VisitVariableProxy(VariableProxy* expr) {
-       HContext* context = new(zone()) HContext;
-       AddInstruction(context);
-       HGlobalObject* global_object = new(zone()) HGlobalObject(context);
-+      if (variable->is_qml_global()) global_object->set_qml_global(true);
-       AddInstruction(global_object);
-       HLoadGlobalGeneric* instr =
-           new(zone()) HLoadGlobalGeneric(context,
-@@ -3307,6 +3308,7 @@ void HGraphBuilder::HandleGlobalVariableAssignment(Variable* var,
-     HContext* context = new(zone()) HContext;
-     AddInstruction(context);
-     HGlobalObject* global_object = new(zone()) HGlobalObject(context);
-+    if (var->is_qml_global()) global_object->set_qml_global(true);
-     AddInstruction(global_object);
-     HStoreGlobalGeneric* instr =
-         new(zone()) HStoreGlobalGeneric(context,
-diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
-index 5d32095..afa599e 100644
---- a/src/ia32/code-stubs-ia32.cc
-+++ b/src/ia32/code-stubs-ia32.cc
-@@ -147,6 +147,13 @@ void FastNewContextStub::Generate(MacroAssembler* masm) {
-   __ mov(ebx, Operand(ebx, Context::SlotOffset(Context::GLOBAL_INDEX)));
-   __ mov(Operand(eax, Context::SlotOffset(Context::GLOBAL_INDEX)), ebx);
- 
-+  // Copy the qml global object from the surrounding context. We go through the
-+  // context in the function (ecx) to match the allocation behavior we have
-+  // in the runtime system (see Heap::AllocateFunctionContext).
-+  __ mov(ebx, FieldOperand(ecx, JSFunction::kContextOffset));
-+  __ mov(ebx, Operand(ebx, Context::SlotOffset(Context::QML_GLOBAL_INDEX)));
-+  __ mov(Operand(eax, Context::SlotOffset(Context::QML_GLOBAL_INDEX)), ebx);
-+
-   // Initialize the rest of the slots to undefined.
-   __ mov(ebx, factory->undefined_value());
-   for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) {
-diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
-index 5d153a8..0ddcde2 100644
---- a/src/ia32/full-codegen-ia32.cc
-+++ b/src/ia32/full-codegen-ia32.cc
-@@ -142,12 +142,13 @@ void FullCodeGenerator::Generate(CompilationInfo* info) {
- 
-   // Possibly allocate a local context.
-   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
--  if (heap_slots > 0) {
-+  if (heap_slots > 0 ||
-+      (scope()->is_qml_mode() && scope()->is_global_scope())) {
-     Comment cmnt(masm_, "[ Allocate local context");
-     // Argument to NewContext is the function, which is still in edi.
-     __ push(edi);
-     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
--      FastNewContextStub stub(heap_slots);
-+      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
-       __ CallStub(&stub);
-     } else {
-       __ CallRuntime(Runtime::kNewContext, 1);
-@@ -1107,10 +1108,10 @@ void FullCodeGenerator::EmitLoadGlobalSlotCheckExtensions(
- 
-   // All extension objects were empty and it is safe to use a global
-   // load IC call.
--  __ mov(eax, GlobalObjectOperand());
-+  __ mov(eax, slot->var()->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
-   __ mov(ecx, slot->var()->name());
-   Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
--  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF)
-+  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF || slot->var()->is_qml_global())
-       ? RelocInfo::CODE_TARGET
-       : RelocInfo::CODE_TARGET_CONTEXT;
-   EmitCallIC(ic, mode);
-@@ -1214,10 +1215,10 @@ void FullCodeGenerator::EmitVariableLoad(Variable* var) {
-     Comment cmnt(masm_, "Global variable");
-     // Use inline caching. Variable name is passed in ecx and the global
-     // object on the stack.
--    __ mov(eax, GlobalObjectOperand());
-+    __ mov(eax, var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
-     __ mov(ecx, var->name());
-     Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
--    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
-+    EmitCallIC(ic, var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
-     context()->Plug(eax);
- 
-   } else if (slot != NULL && slot->type() == Slot::LOOKUP) {
-@@ -1837,11 +1838,11 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
-     // assignment.  Right-hand-side value is passed in eax, variable name in
-     // ecx, and the global object on the stack.
-     __ mov(ecx, var->name());
--    __ mov(edx, GlobalObjectOperand());
-+    __ mov(edx, var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
-     Handle<Code> ic = is_strict_mode()
-         ? isolate()->builtins()->StoreIC_Initialize_Strict()
-         : isolate()->builtins()->StoreIC_Initialize();
--    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
-+    EmitCallIC(ic, var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
- 
-   } else if (op == Token::INIT_CONST) {
-     // Like var declarations, const declarations are hoisted to function
-@@ -2113,9 +2114,12 @@ void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
-   // Push the strict mode flag.
-   __ push(Immediate(Smi::FromInt(strict_mode_flag())));
- 
-+  // Push the qml mode flag
-+  __ push(Immediate(Smi::FromInt(is_qml_mode())));
-+
-   __ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
-                  ? Runtime::kResolvePossiblyDirectEvalNoLookup
--                 : Runtime::kResolvePossiblyDirectEval, 4);
-+                 : Runtime::kResolvePossiblyDirectEval, 5);
- }
- 
- 
-@@ -2188,8 +2192,8 @@ void FullCodeGenerator::VisitCall(Call* expr) {
-     context()->DropAndPlug(1, eax);
-   } else if (var != NULL && !var->is_this() && var->is_global()) {
-     // Push global object as receiver for the call IC.
--    __ push(GlobalObjectOperand());
--    EmitCallWithIC(expr, var->name(), RelocInfo::CODE_TARGET_CONTEXT);
-+    __ push(var->is_qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
-+    EmitCallWithIC(expr, var->name(), var->is_qml_global()?RelocInfo::CODE_TARGET:RelocInfo::CODE_TARGET_CONTEXT);
-   } else if (var != NULL && var->AsSlot() != NULL &&
-              var->AsSlot()->type() == Slot::LOOKUP) {
-     // Call to a lookup slot (dynamically introduced variable).
-diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
-index 0f96f78..c1da075 100644
---- a/src/ia32/lithium-codegen-ia32.cc
-+++ b/src/ia32/lithium-codegen-ia32.cc
-@@ -159,12 +159,13 @@ bool LCodeGen::GeneratePrologue() {
- 
-   // Possibly allocate a local context.
-   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
--  if (heap_slots > 0) {
-+  if (heap_slots > 0 ||
-+      (scope()->is_qml_mode() && scope()->is_global_scope())) {
-     Comment(";;; Allocate local context");
-     // Argument to NewContext is the function, which is still in edi.
-     __ push(edi);
-     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
--      FastNewContextStub stub(heap_slots);
-+      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
-       __ CallStub(&stub);
-     } else {
-       __ CallRuntime(Runtime::kNewContext, 1);
-@@ -2525,7 +2526,7 @@ void LCodeGen::DoOuterContext(LOuterContext* instr) {
- void LCodeGen::DoGlobalObject(LGlobalObject* instr) {
-   Register context = ToRegister(instr->context());
-   Register result = ToRegister(instr->result());
--  __ mov(result, Operand(context, Context::SlotOffset(Context::GLOBAL_INDEX)));
-+  __ mov(result, Operand(context, Context::SlotOffset(instr->qml_global()?Context::QML_GLOBAL_INDEX:Context::GLOBAL_INDEX)));
- }
- 
- 
-diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
-index 9ccd189..8e98b73 100644
---- a/src/ia32/lithium-ia32.cc
-+++ b/src/ia32/lithium-ia32.cc
-@@ -1205,7 +1205,7 @@ LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
- 
- LInstruction* LChunkBuilder::DoGlobalObject(HGlobalObject* instr) {
-   LOperand* context = UseRegisterAtStart(instr->value());
--  return DefineAsRegister(new LGlobalObject(context));
-+  return DefineAsRegister(new LGlobalObject(context, instr->qml_global()));
- }
- 
- 
-diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
-index 9ace8f8..95ed001 100644
---- a/src/ia32/lithium-ia32.h
-+++ b/src/ia32/lithium-ia32.h
-@@ -1416,13 +1416,17 @@ class LOuterContext: public LTemplateInstruction<1, 1, 0> {
- 
- class LGlobalObject: public LTemplateInstruction<1, 1, 0> {
-  public:
--  explicit LGlobalObject(LOperand* context) {
-+  explicit LGlobalObject(LOperand* context, bool qml_global) {
-     inputs_[0] = context;
-+    qml_global_ = qml_global;
-   }
- 
-   DECLARE_CONCRETE_INSTRUCTION(GlobalObject, "global-object")
- 
-   LOperand* context() { return InputAt(0); }
-+  bool qml_global() { return qml_global_; }
-+ private:
-+  bool qml_global_;
- };
- 
- 
-diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
-index b986264..f8479ae 100644
---- a/src/ia32/macro-assembler-ia32.h
-+++ b/src/ia32/macro-assembler-ia32.h
-@@ -778,6 +778,11 @@ static inline Operand GlobalObjectOperand() {
- }
- 
- 
-+static inline Operand QmlGlobalObjectOperand() {
-+  return ContextOperand(esi, Context::QML_GLOBAL_INDEX);
-+}
-+
-+
- // Generates an Operand for saving parameters after PrepareCallApiFunction.
- Operand ApiParameterOperand(int index);
- 
-diff --git a/src/objects-inl.h b/src/objects-inl.h
-index 231b835..1c7f83e 100644
---- a/src/objects-inl.h
-+++ b/src/objects-inl.h
-@@ -3242,6 +3242,18 @@ void SharedFunctionInfo::set_strict_mode(bool value) {
- }
- 
- 
-+bool SharedFunctionInfo::qml_mode() {
-+  return BooleanBit::get(compiler_hints(), kQmlModeFunction);
-+}
-+
-+
-+void SharedFunctionInfo::set_qml_mode(bool value) {
-+  set_compiler_hints(BooleanBit::set(compiler_hints(),
-+                                     kQmlModeFunction,
-+                                     value));
-+}
-+
-+
- ACCESSORS(CodeCache, default_cache, FixedArray, kDefaultCacheOffset)
- ACCESSORS(CodeCache, normal_type_cache, Object, kNormalTypeCacheOffset)
- 
-diff --git a/src/objects.h b/src/objects.h
-index 1bdb5c7..edbc47a 100644
---- a/src/objects.h
-+++ b/src/objects.h
-@@ -4331,6 +4331,10 @@ class SharedFunctionInfo: public HeapObject {
-   inline bool strict_mode();
-   inline void set_strict_mode(bool value);
- 
-+  // Indicates whether the function is a qml mode function
-+  inline bool qml_mode();
-+  inline void set_qml_mode(bool value);
-+
-   // Indicates whether or not the code in the shared function support
-   // deoptimization.
-   inline bool has_deoptimization_support();
-@@ -4511,6 +4515,7 @@ class SharedFunctionInfo: public HeapObject {
-   static const int kCodeAgeMask = 0x7;
-   static const int kOptimizationDisabled = 6;
-   static const int kStrictModeFunction = 7;
-+  static const int kQmlModeFunction = 8;
- 
-  private:
- #if V8_HOST_ARCH_32_BIT
-diff --git a/src/parser.cc b/src/parser.cc
-index a84ec6f..7f5c361 100644
---- a/src/parser.cc
-+++ b/src/parser.cc
-@@ -593,7 +593,8 @@ Parser::Parser(Handle<Script> script,
- 
- FunctionLiteral* Parser::ParseProgram(Handle<String> source,
-                                       bool in_global_context,
--                                      StrictModeFlag strict_mode) {
-+                                      StrictModeFlag strict_mode,
-+                                      bool qml_mode) {
-   CompilationZoneScope zone_scope(DONT_DELETE_ON_EXIT);
- 
-   HistogramTimerScope timer(isolate()->counters()->parse());
-@@ -609,11 +610,11 @@ FunctionLiteral* Parser::ParseProgram(Handle<String> source,
-     ExternalTwoByteStringUC16CharacterStream stream(
-         Handle<ExternalTwoByteString>::cast(source), 0, source->length());
-     scanner_.Initialize(&stream);
--    return DoParseProgram(source, in_global_context, strict_mode, &zone_scope);
-+    return DoParseProgram(source, in_global_context, strict_mode, qml_mode, &zone_scope);
-   } else {
-     GenericStringUC16CharacterStream stream(source, 0, source->length());
-     scanner_.Initialize(&stream);
--    return DoParseProgram(source, in_global_context, strict_mode, &zone_scope);
-+    return DoParseProgram(source, in_global_context, strict_mode, qml_mode, &zone_scope);
-   }
- }
- 
-@@ -621,6 +622,7 @@ FunctionLiteral* Parser::ParseProgram(Handle<String> source,
- FunctionLiteral* Parser::DoParseProgram(Handle<String> source,
-                                         bool in_global_context,
-                                         StrictModeFlag strict_mode,
-+                                        bool qml_mode,
-                                         ZoneScope* zone_scope) {
-   ASSERT(target_stack_ == NULL);
-   if (pre_data_ != NULL) pre_data_->Initialize();
-@@ -641,6 +643,9 @@ FunctionLiteral* Parser::DoParseProgram(Handle<String> source,
-     if (strict_mode == kStrictMode) {
-       top_scope_->EnableStrictMode();
-     }
-+    if (qml_mode) {
-+      scope->EnableQmlMode();
-+    }
-     ZoneList<Statement*>* body = new ZoneList<Statement*>(16);
-     bool ok = true;
-     int beg_loc = scanner().location().beg_pos;
-@@ -729,6 +734,9 @@ FunctionLiteral* Parser::ParseLazy(CompilationInfo* info,
-     if (shared_info->strict_mode()) {
-       top_scope_->EnableStrictMode();
-     }
-+    if (shared_info->qml_mode()) {
-+      top_scope_->EnableQmlMode();
-+    }
- 
-     FunctionLiteralType type =
-         shared_info->is_expression() ? EXPRESSION : DECLARATION;
-@@ -1661,6 +1669,11 @@ Block* Parser::ParseVariableDeclarations(bool accept_IN,
-         arguments->Add(value);
-         value = NULL;  // zap the value to avoid the unnecessary assignment
- 
-+        int qml_mode = 0;
-+        if (top_scope_->is_qml_mode() && !Isolate::Current()->global()->HasProperty(*name)) 
-+          qml_mode = 1;
-+        arguments->Add(NewNumberLiteral(qml_mode));
-+
-         // Construct the call to Runtime_InitializeConstGlobal
-         // and add it to the initialization statement block.
-         // Note that the function does different things depending on
-@@ -1676,6 +1689,11 @@ Block* Parser::ParseVariableDeclarations(bool accept_IN,
-         arguments->Add(NewNumberLiteral(
-             top_scope_->is_strict_mode() ? kStrictMode : kNonStrictMode));
- 
-+        int qml_mode = 0;
-+        if (top_scope_->is_qml_mode() && !Isolate::Current()->global()->HasProperty(*name)) 
-+          qml_mode = 1;
-+        arguments->Add(NewNumberLiteral(qml_mode));
-+
-         // Be careful not to assign a value to the global variable if
-         // we're in a with. The initialization value should not
-         // necessarily be stored in the global object in that case,
-@@ -5157,7 +5175,8 @@ bool ParserApi::Parse(CompilationInfo* info) {
-       Handle<String> source = Handle<String>(String::cast(script->source()));
-       result = parser.ParseProgram(source,
-                                    info->is_global(),
--                                   info->StrictMode());
-+                                   info->StrictMode(),
-+                                   info->is_qml_mode());
-     }
-   }
- 
-diff --git a/src/parser.h b/src/parser.h
-index 64f1303..4d45e45 100644
---- a/src/parser.h
-+++ b/src/parser.h
-@@ -431,7 +431,8 @@ class Parser {
-   // Returns NULL if parsing failed.
-   FunctionLiteral* ParseProgram(Handle<String> source,
-                                 bool in_global_context,
--                                StrictModeFlag strict_mode);
-+                                StrictModeFlag strict_mode,
-+                                bool qml_mode);
- 
-   FunctionLiteral* ParseLazy(CompilationInfo* info);
- 
-@@ -464,6 +465,7 @@ class Parser {
-   FunctionLiteral* DoParseProgram(Handle<String> source,
-                                   bool in_global_context,
-                                   StrictModeFlag strict_mode,
-+                                  bool qml_mode,
-                                   ZoneScope* zone_scope);
- 
-   // Report syntax error
-diff --git a/src/prettyprinter.cc b/src/prettyprinter.cc
-index c777ab4..1964e02 100644
---- a/src/prettyprinter.cc
-+++ b/src/prettyprinter.cc
-@@ -656,6 +656,9 @@ void AstPrinter::PrintLiteralWithModeIndented(const char* info,
-     EmbeddedVector<char, 256> buf;
-     int pos = OS::SNPrintF(buf, "%s (mode = %s", info,
-                            Variable::Mode2String(var->mode()));
-+    if (var->is_qml_global()) {
-+      pos += OS::SNPrintF(buf + pos, ":QML");
-+    }
-     OS::SNPrintF(buf + pos, ")");
-     PrintLiteralIndented(buf.start(), value, true);
-   }
-diff --git a/src/runtime.cc b/src/runtime.cc
-index 660352c..c13f92d 100644
---- a/src/runtime.cc
-+++ b/src/runtime.cc
-@@ -1065,8 +1065,6 @@ static Failure* ThrowRedeclarationError(Isolate* isolate,
- RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
-   ASSERT(args.length() == 4);
-   HandleScope scope(isolate);
--  Handle<GlobalObject> global = Handle<GlobalObject>(
--      isolate->context()->global());
- 
-   Handle<Context> context = args.at<Context>(0);
-   CONVERT_ARG_CHECKED(FixedArray, pairs, 1);
-@@ -1075,6 +1073,9 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
-       static_cast<StrictModeFlag>(Smi::cast(args[3])->value());
-   ASSERT(strict_mode == kStrictMode || strict_mode == kNonStrictMode);
- 
-+  Handle<JSObject> js_global = Handle<JSObject>(isolate->context()->global());
-+  Handle<JSObject> qml_global = Handle<JSObject>(isolate->context()->qml_global());
-+
-   // Compute the property attributes. According to ECMA-262, section
-   // 13, page 71, the property must be read-only and
-   // non-deletable. However, neither SpiderMonkey nor KJS creates the
-@@ -1083,10 +1084,13 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
- 
-   // Traverse the name/value pairs and set the properties.
-   int length = pairs->length();
--  for (int i = 0; i < length; i += 2) {
-+  for (int i = 0; i < length; i += 3) {
-     HandleScope scope(isolate);
-     Handle<String> name(String::cast(pairs->get(i)));
-     Handle<Object> value(pairs->get(i + 1), isolate);
-+    Handle<Smi> is_qml_global(Smi::cast(pairs->get(i + 2)));
-+
-+    Handle<JSObject> global = is_qml_global->value()?qml_global:js_global;
- 
-     // We have to declare a global const property. To capture we only
-     // assign to it when evaluating the assignment for "const x =
-@@ -1316,20 +1320,25 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
-   NoHandleAllocation nha;
-   // args[0] == name
-   // args[1] == strict_mode
--  // args[2] == value (optional)
-+  // args[2] == qml_mode
-+  // args[3] == value (optional)
- 
-   // Determine if we need to assign to the variable if it already
-   // exists (based on the number of arguments).
--  RUNTIME_ASSERT(args.length() == 2 || args.length() == 3);
--  bool assign = args.length() == 3;
-+  RUNTIME_ASSERT(args.length() == 3 || args.length() == 4);
-+  bool assign = args.length() == 4;
- 
-   CONVERT_ARG_CHECKED(String, name, 0);
--  GlobalObject* global = isolate->context()->global();
-   RUNTIME_ASSERT(args[1]->IsSmi());
-   StrictModeFlag strict_mode =
-       static_cast<StrictModeFlag>(Smi::cast(args[1])->value());
-   ASSERT(strict_mode == kStrictMode || strict_mode == kNonStrictMode);
- 
-+  RUNTIME_ASSERT(args[2]->IsSmi());
-+  int qml_mode = Smi::cast(args[2])->value();
-+
-+  JSObject* global = qml_mode?isolate->context()->qml_global():isolate->context()->global();
-+
-   // According to ECMA-262, section 12.2, page 62, the property must
-   // not be deletable.
-   PropertyAttributes attributes = DONT_DELETE;
-@@ -1350,7 +1359,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
-       if (lookup.IsReadOnly()) {
-         // If we found readonly property on one of hidden prototypes,
-         // just shadow it.
--        if (real_holder != isolate->context()->global()) break;
-+        if (real_holder != global) break;
-         return ThrowRedeclarationError(isolate, "const", name);
-       }
- 
-@@ -1372,7 +1381,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
-           // overwrite it with a variable declaration we must throw a
-           // re-declaration error.  However if we found readonly property
-           // on one of hidden prototypes, just shadow it.
--          if (real_holder != isolate->context()->global()) break;
-+          if (real_holder != global) break;
-           return ThrowRedeclarationError(isolate, "const", name);
-         }
-       }
-@@ -1384,7 +1393,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
-       }
- 
-       // Assign the value (or undefined) to the property.
--      Object* value = (assign) ? args[2] : isolate->heap()->undefined_value();
-+      Object* value = (assign) ? args[3] : isolate->heap()->undefined_value();
-       return real_holder->SetProperty(
-           &lookup, *name, value, attributes, strict_mode);
-     }
-@@ -1399,9 +1408,9 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
-     real_holder = JSObject::cast(proto);
-   }
- 
--  global = isolate->context()->global();
-+  global = qml_mode?isolate->context()->qml_global():isolate->context()->global();
-   if (assign) {
--    return global->SetProperty(*name, args[2], attributes, strict_mode, true);
-+    return global->SetProperty(*name, args[3], attributes, strict_mode, true);
-   }
-   return isolate->heap()->undefined_value();
- }
-@@ -1411,12 +1420,15 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeConstGlobal) {
-   // All constants are declared with an initial value. The name
-   // of the constant is the first argument and the initial value
-   // is the second.
--  RUNTIME_ASSERT(args.length() == 2);
-+  RUNTIME_ASSERT(args.length() == 3);
-   CONVERT_ARG_CHECKED(String, name, 0);
-   Handle<Object> value = args.at<Object>(1);
- 
-+  RUNTIME_ASSERT(args[2]->IsSmi());
-+  int qml_mode = Smi::cast(args[2])->value();
-+
-   // Get the current global object from top.
--  GlobalObject* global = isolate->context()->global();
-+  JSObject* global = qml_mode?isolate->context()->qml_global():isolate->context()->global();
- 
-   // According to ECMA-262, section 12.2, page 62, the property must
-   // not be deletable. Since it's a const, it must be READ_ONLY too.
-@@ -1456,7 +1468,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeConstGlobal) {
-     // with setting the value because the property is either absent or
-     // read-only. We also have to do redo the lookup.
-     HandleScope handle_scope(isolate);
--    Handle<GlobalObject> global(isolate->context()->global());
-+    Handle<JSObject> global(qml_mode?isolate->context()->qml_global():isolate->context()->global());
- 
-     // BUG 1213575: Handle the case where we have to set a read-only
-     // property through an interceptor and only do it if it's
-@@ -8160,7 +8172,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileString) {
-   Handle<SharedFunctionInfo> shared = Compiler::CompileEval(source,
-                                                             context,
-                                                             true,
--                                                            kNonStrictMode);
-+                                                            kNonStrictMode,
-+                                                            false);
-   if (shared.is_null()) return Failure::Exception();
-   Handle<JSFunction> fun =
-       isolate->factory()->NewFunctionFromSharedFunctionInfo(shared,
-@@ -8173,14 +8186,16 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileString) {
- static ObjectPair CompileGlobalEval(Isolate* isolate,
-                                     Handle<String> source,
-                                     Handle<Object> receiver,
--                                    StrictModeFlag strict_mode) {
-+                                    StrictModeFlag strict_mode,
-+                                    bool qml_mode) {
-   // Deal with a normal eval call with a string argument. Compile it
-   // and return the compiled function bound in the local context.
-   Handle<SharedFunctionInfo> shared = Compiler::CompileEval(
-       source,
-       Handle<Context>(isolate->context()),
-       isolate->context()->IsGlobalContext(),
--      strict_mode);
-+      strict_mode,
-+      qml_mode); 
-   if (shared.is_null()) return MakePair(Failure::Exception(), NULL);
-   Handle<JSFunction> compiled =
-       isolate->factory()->NewFunctionFromSharedFunctionInfo(
-@@ -8190,7 +8205,7 @@ static ObjectPair CompileGlobalEval(Isolate* isolate,
- 
- 
- RUNTIME_FUNCTION(ObjectPair, Runtime_ResolvePossiblyDirectEval) {
--  ASSERT(args.length() == 4);
-+  ASSERT(args.length() == 5);
- 
-   HandleScope scope(isolate);
-   Handle<Object> callee = args.at<Object>(0);
-@@ -8257,16 +8272,18 @@ RUNTIME_FUNCTION(ObjectPair, Runtime_ResolvePossiblyDirectEval) {
-   }
- 
-   ASSERT(args[3]->IsSmi());
-+  ASSERT(args[4]->IsSmi());
-   return CompileGlobalEval(isolate,
-                            args.at<String>(1),
-                            args.at<Object>(2),
-                            static_cast<StrictModeFlag>(
--                                Smi::cast(args[3])->value()));
-+                                Smi::cast(args[3])->value()),
-+                           Smi::cast(args[4])->value());
- }
- 
- 
- RUNTIME_FUNCTION(ObjectPair, Runtime_ResolvePossiblyDirectEvalNoLookup) {
--  ASSERT(args.length() == 4);
-+  ASSERT(args.length() == 5);
- 
-   HandleScope scope(isolate);
-   Handle<Object> callee = args.at<Object>(0);
-@@ -8280,11 +8297,13 @@ RUNTIME_FUNCTION(ObjectPair, Runtime_ResolvePossiblyDirectEvalNoLookup) {
-   }
- 
-   ASSERT(args[3]->IsSmi());
-+  ASSERT(args[4]->IsSmi());
-   return CompileGlobalEval(isolate,
-                            args.at<String>(1),
-                            args.at<Object>(2),
-                            static_cast<StrictModeFlag>(
--                                Smi::cast(args[3])->value()));
-+                                Smi::cast(args[3])->value()),
-+                           Smi::cast(args[4])->value());
- }
- 
- 
-@@ -10570,6 +10589,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugEvaluate) {
-   Handle<JSFunction> function(JSFunction::cast(frame->function()));
-   Handle<SerializedScopeInfo> scope_info(function->shared()->scope_info());
-   ScopeInfo<> sinfo(*scope_info);
-+  bool qml_mode = function->shared()->qml_mode();
- 
-   // Traverse the saved contexts chain to find the active context for the
-   // selected frame.
-@@ -10633,7 +10653,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugEvaluate) {
-       Compiler::CompileEval(function_source,
-                             context,
-                             context->IsGlobalContext(),
--                            kNonStrictMode);
-+                            kNonStrictMode,
-+                            qml_mode);
-   if (shared.is_null()) return Failure::Exception();
-   Handle<JSFunction> compiled_function =
-       isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context);
-@@ -10656,7 +10677,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugEvaluate) {
-                           Handle<Object>::cast(source).location() };
-   Handle<Object> result =
-       Execution::Call(Handle<JSFunction>::cast(evaluation_function), receiver,
--                      argc, argv, &has_pending_exception);
-+                      argc, argv, &has_pending_exception,
-+                      Handle<Object>(function->context()->qml_global()));
-   if (has_pending_exception) return Failure::Exception();
- 
-   // Skip the global proxy as it has no properties and always delegates to the
-@@ -10722,7 +10744,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugEvaluateGlobal) {
-   // Currently, the eval code will be executed in non-strict mode,
-   // even in the strict code context.
-   Handle<SharedFunctionInfo> shared =
--      Compiler::CompileEval(source, context, is_global, kNonStrictMode);
-+      Compiler::CompileEval(source, context, is_global, kNonStrictMode, false);
-   if (shared.is_null()) return Failure::Exception();
-   Handle<JSFunction> compiled_function =
-       Handle<JSFunction>(
-diff --git a/src/runtime.h b/src/runtime.h
-index bf1ba68..5e97173 100644
---- a/src/runtime.h
-+++ b/src/runtime.h
-@@ -241,8 +241,8 @@ namespace internal {
-   \
-   /* Eval */ \
-   F(GlobalReceiver, 1, 1) \
--  F(ResolvePossiblyDirectEval, 4, 2) \
--  F(ResolvePossiblyDirectEvalNoLookup, 4, 2) \
-+  F(ResolvePossiblyDirectEval, 5, 2) \
-+  F(ResolvePossiblyDirectEvalNoLookup, 5, 2) \
-   \
-   F(SetProperty, -1 /* 4 or 5 */, 1) \
-   F(DefineOrRedefineDataProperty, 4, 1) \
-@@ -296,8 +296,8 @@ namespace internal {
-   /* Declarations and initialization */ \
-   F(DeclareGlobals, 4, 1) \
-   F(DeclareContextSlot, 4, 1) \
--  F(InitializeVarGlobal, -1 /* 2 or 3 */, 1) \
--  F(InitializeConstGlobal, 2, 1) \
-+  F(InitializeVarGlobal, -1 /* 3 or 4 */, 1) \
-+  F(InitializeConstGlobal, 3, 1) \
-   F(InitializeConstContextSlot, 3, 1) \
-   F(OptimizeObjectForAddingMultipleProperties, 2, 1) \
-   \
-diff --git a/src/scopes.cc b/src/scopes.cc
-index 8df93c5..b5d7ff3 100644
---- a/src/scopes.cc
-+++ b/src/scopes.cc
-@@ -198,6 +198,7 @@ void Scope::SetDefaults(Type type,
-   scope_calls_eval_ = false;
-   // Inherit the strict mode from the parent scope.
-   strict_mode_ = (outer_scope != NULL) && outer_scope->strict_mode_;
-+  qml_mode_ = (outer_scope != NULL) && outer_scope->qml_mode_;
-   outer_scope_calls_eval_ = false;
-   inner_scope_calls_eval_ = false;
-   outer_scope_is_eval_scope_ = false;
-@@ -796,6 +797,25 @@ void Scope::ResolveVariable(Scope* global_scope,
-         ASSERT(global_scope != NULL);
-         var = global_scope->DeclareGlobal(proxy->name());
- 
-+        if (qml_mode_) {
-+          Handle<GlobalObject> global = Isolate::Current()->global();
-+
-+#ifdef ENABLE_DEBUGGER_SUPPORT
-+          if (Isolate::Current()->debug()->IsLoaded() && Isolate::Current()->debug()->InDebugger()) {
-+            //Get the context before the debugger was entered.
-+            SaveContext *save = Isolate::Current()->save_context();
-+            while (save != NULL && *save->context() == *Isolate::Current()->debug()->debug_context())
-+              save = save->prev();
-+
-+            global = Handle<GlobalObject>(save->context()->global());
-+          }
-+#endif
-+
-+          if (!global->HasProperty(*(proxy->name()))) {
-+            var->set_is_qml_global(true);
-+          }
-+        }
-+
-       } else if (scope_inside_with_) {
-         // If we are inside a with statement we give up and look up
-         // the variable at runtime.
-@@ -817,6 +837,25 @@ void Scope::ResolveVariable(Scope* global_scope,
-         if (context->GlobalIfNotShadowedByEval(proxy->name())) {
-           var = NonLocal(proxy->name(), Variable::DYNAMIC_GLOBAL);
- 
-+          if (qml_mode_) {
-+            Handle<GlobalObject> global = Isolate::Current()->global();
-+
-+#ifdef ENABLE_DEBUGGER_SUPPORT
-+            if (Isolate::Current()->debug()->IsLoaded() && Isolate::Current()->debug()->InDebugger()) {
-+              //Get the context before the debugger was entered.
-+              SaveContext *save = Isolate::Current()->save_context();
-+              while (save != NULL && *save->context() == *Isolate::Current()->debug()->debug_context())
-+                save = save->prev();
-+
-+              global = Handle<GlobalObject>(save->context()->global());
-+            }
-+#endif
-+
-+            if (qml_mode_ && !global->HasProperty(*(proxy->name()))) {
-+              var->set_is_qml_global(true);
-+            }
-+          }
-+
-         } else {
-           var = NonLocal(proxy->name(), Variable::DYNAMIC);
-         }
-@@ -827,6 +866,26 @@ void Scope::ResolveVariable(Scope* global_scope,
-         // variable is global unless it is shadowed by eval-introduced
-         // variables.
-         var = NonLocal(proxy->name(), Variable::DYNAMIC_GLOBAL);
-+
-+        if (qml_mode_) {
-+          Handle<GlobalObject> global = Isolate::Current()->global();
-+
-+#ifdef ENABLE_DEBUGGER_SUPPORT
-+          if (Isolate::Current()->debug()->IsLoaded() && Isolate::Current()->debug()->InDebugger()) {
-+            //Get the context before the debugger was entered.
-+            SaveContext *save = Isolate::Current()->save_context();
-+            while (save != NULL && *save->context() == *Isolate::Current()->debug()->debug_context())
-+              save = save->prev();
-+
-+            global = Handle<GlobalObject>(save->context()->global());
-+          }
-+#endif
-+
-+          if (qml_mode_ && !global->HasProperty(*(proxy->name()))) {
-+            var->set_is_qml_global(true);
-+          }
-+        }
-+
-       }
-     }
-   }
-diff --git a/src/scopes.h b/src/scopes.h
-index a0e56a4..6dd3f65 100644
---- a/src/scopes.h
-+++ b/src/scopes.h
-@@ -210,6 +210,11 @@ class Scope: public ZoneObject {
-     strict_mode_ = FLAG_strict_mode;
-   }
- 
-+  // Enable qml mode for this scope
-+  void EnableQmlMode() {
-+    qml_mode_ = true;
-+  }
-+
-   // ---------------------------------------------------------------------------
-   // Predicates.
- 
-@@ -218,6 +223,7 @@ class Scope: public ZoneObject {
-   bool is_function_scope() const { return type_ == FUNCTION_SCOPE; }
-   bool is_global_scope() const { return type_ == GLOBAL_SCOPE; }
-   bool is_strict_mode() const { return strict_mode_; }
-+  bool is_qml_mode() const { return qml_mode_; }
- 
-   // Information about which scopes calls eval.
-   bool calls_eval() const { return scope_calls_eval_; }
-@@ -376,6 +382,7 @@ class Scope: public ZoneObject {
-   bool scope_contains_with_;  // this scope contains a 'with' statement
-   bool scope_calls_eval_;  // this scope contains an 'eval' call
-   bool strict_mode_;  // this scope is a strict mode scope
-+  bool qml_mode_; // this scope is a qml mode scope
- 
-   // Computed via PropagateScopeInfo.
-   bool outer_scope_calls_eval_;
-diff --git a/src/variables.cc b/src/variables.cc
-index 0502722..190baf6 100644
---- a/src/variables.cc
-+++ b/src/variables.cc
-@@ -99,7 +99,8 @@ Variable::Variable(Scope* scope,
-     rewrite_(NULL),
-     is_valid_LHS_(is_valid_LHS),
-     is_accessed_from_inner_scope_(false),
--    is_used_(false) {
-+    is_used_(false),
-+    is_qml_global_(false) {
-   // names must be canonicalized for fast equality checks
-   ASSERT(name->IsSymbol());
- }
-diff --git a/src/variables.h b/src/variables.h
-index b1ff0db..0b31d1a 100644
---- a/src/variables.h
-+++ b/src/variables.h
-@@ -141,6 +141,8 @@ class Variable: public ZoneObject {
-   Expression* rewrite() const { return rewrite_; }
-   void set_rewrite(Expression* expr) { rewrite_ = expr; }
- 
-+  bool is_qml_global() const { return is_qml_global_; }
-+  void set_is_qml_global(bool is_qml_global) { is_qml_global_ = is_qml_global; }
-  private:
-   Scope* scope_;
-   Handle<String> name_;
-@@ -159,6 +161,9 @@ class Variable: public ZoneObject {
-   // Usage info.
-   bool is_accessed_from_inner_scope_;  // set by variable resolver
-   bool is_used_;
-+
-+  // QML info
-+  bool is_qml_global_;
- };
- 
- 
-diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
-index c365385..d923494 100644
---- a/src/x64/code-stubs-x64.cc
-+++ b/src/x64/code-stubs-x64.cc
-@@ -140,6 +140,10 @@ void FastNewContextStub::Generate(MacroAssembler* masm) {
-   __ movq(rbx, Operand(rsi, Context::SlotOffset(Context::GLOBAL_INDEX)));
-   __ movq(Operand(rax, Context::SlotOffset(Context::GLOBAL_INDEX)), rbx);
- 
-+  // Copy the qml global object from the surrounding context.
-+  __ movq(rbx, Operand(rsi, Context::SlotOffset(Context::QML_GLOBAL_INDEX)));
-+  __ movq(Operand(rax, Context::SlotOffset(Context::QML_GLOBAL_INDEX)), rbx);
-+
-   // Initialize the rest of the slots to undefined.
-   __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
-   for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) {
-diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
-index 97168cd..c45cdb6 100644
---- a/src/x64/full-codegen-x64.cc
-+++ b/src/x64/full-codegen-x64.cc
-@@ -141,12 +141,13 @@ void FullCodeGenerator::Generate(CompilationInfo* info) {
- 
-   // Possibly allocate a local context.
-   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
--  if (heap_slots > 0) {
-+  if (heap_slots > 0 || 
-+      (scope()->is_qml_mode() && scope()->is_global_scope())) {
-     Comment cmnt(masm_, "[ Allocate local context");
-     // Argument to NewContext is the function, which is still in rdi.
-     __ push(rdi);
-     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
--      FastNewContextStub stub(heap_slots);
-+      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
-       __ CallStub(&stub);
-     } else {
-       __ CallRuntime(Runtime::kNewContext, 1);
-@@ -1119,10 +1120,10 @@ void FullCodeGenerator::EmitLoadGlobalSlotCheckExtensions(
- 
-   // All extension objects were empty and it is safe to use a global
-   // load IC call.
--  __ movq(rax, GlobalObjectOperand());
-+  __ movq(rax, slot->var()->is_qml_global() ? QmlGlobalObjectOperand() : GlobalObjectOperand());
-   __ Move(rcx, slot->var()->name());
-   Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
--  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF)
-+  RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF || slot->var()->is_qml_global())
-       ? RelocInfo::CODE_TARGET
-       : RelocInfo::CODE_TARGET_CONTEXT;
-   EmitCallIC(ic, mode);
-@@ -1227,9 +1228,9 @@ void FullCodeGenerator::EmitVariableLoad(Variable* var) {
-     // Use inline caching. Variable name is passed in rcx and the global
-     // object on the stack.
-     __ Move(rcx, var->name());
--    __ movq(rax, GlobalObjectOperand());
-+    __ movq(rax, var->is_qml_global() ? QmlGlobalObjectOperand() : GlobalObjectOperand());
-     Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
--    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
-+    EmitCallIC(ic, var->is_qml_global() ? RelocInfo::CODE_TARGET : RelocInfo::CODE_TARGET_CONTEXT);
-     context()->Plug(rax);
- 
-   } else if (slot != NULL && slot->type() == Slot::LOOKUP) {
-@@ -1806,11 +1807,11 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
-     // assignment.  Right-hand-side value is passed in rax, variable name in
-     // rcx, and the global object on the stack.
-     __ Move(rcx, var->name());
--    __ movq(rdx, GlobalObjectOperand());
-+    __ movq(rdx, var->is_qml_global() ? QmlGlobalObjectOperand() : GlobalObjectOperand());
-     Handle<Code> ic = is_strict_mode()
-         ? isolate()->builtins()->StoreIC_Initialize_Strict()
-         : isolate()->builtins()->StoreIC_Initialize();
--    EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
-+    EmitCallIC(ic, var->is_qml_global() ? RelocInfo::CODE_TARGET : RelocInfo::CODE_TARGET_CONTEXT);
- 
-   } else if (op == Token::INIT_CONST) {
-     // Like var declarations, const declarations are hoisted to function
-@@ -2085,9 +2086,12 @@ void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
-   // Push the strict mode flag.
-   __ Push(Smi::FromInt(strict_mode_flag()));
- 
-+  // Push the qml mode flag
-+  __ Push(Smi::FromInt(is_qml_mode()));
-+
-   __ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
-                  ? Runtime::kResolvePossiblyDirectEvalNoLookup
--                 : Runtime::kResolvePossiblyDirectEval, 4);
-+                 : Runtime::kResolvePossiblyDirectEval, 5);
- }
- 
- 
-@@ -2160,8 +2164,8 @@ void FullCodeGenerator::VisitCall(Call* expr) {
-   } else if (var != NULL && !var->is_this() && var->is_global()) {
-     // Call to a global variable.
-     // Push global object as receiver for the call IC lookup.
--    __ push(GlobalObjectOperand());
--    EmitCallWithIC(expr, var->name(), RelocInfo::CODE_TARGET_CONTEXT);
-+    __ push(var->is_qml_global() ? QmlGlobalObjectOperand() : GlobalObjectOperand());
-+    EmitCallWithIC(expr, var->name(), var->is_qml_global() ? RelocInfo::CODE_TARGET : RelocInfo::CODE_TARGET_CONTEXT);
-   } else if (var != NULL && var->AsSlot() != NULL &&
-              var->AsSlot()->type() == Slot::LOOKUP) {
-     // Call to a lookup slot (dynamically introduced variable).
-diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
-index 202e7a2..45acbdf 100644
---- a/src/x64/lithium-codegen-x64.cc
-+++ b/src/x64/lithium-codegen-x64.cc
-@@ -174,12 +174,13 @@ bool LCodeGen::GeneratePrologue() {
- 
-   // Possibly allocate a local context.
-   int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
--  if (heap_slots > 0) {
-+  if (heap_slots > 0 ||
-+      (scope()->is_qml_mode() && scope()->is_global_scope())) {
-     Comment(";;; Allocate local context");
-     // Argument to NewContext is the function, which is still in rdi.
-     __ push(rdi);
-     if (heap_slots <= FastNewContextStub::kMaximumSlots) {
--      FastNewContextStub stub(heap_slots);
-+      FastNewContextStub stub((heap_slots < 0)?0:heap_slots);
-       __ CallStub(&stub);
-     } else {
-       __ CallRuntime(Runtime::kNewContext, 1);
-@@ -2540,7 +2541,7 @@ void LCodeGen::DoOuterContext(LOuterContext* instr) {
- 
- void LCodeGen::DoGlobalObject(LGlobalObject* instr) {
-   Register result = ToRegister(instr->result());
--  __ movq(result, GlobalObjectOperand());
-+  __ movq(result, instr->qml_global()?QmlGlobalObjectOperand():GlobalObjectOperand());
- }
- 
- 
-diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
-index 07ca3a5..00feeac 100644
---- a/src/x64/lithium-x64.cc
-+++ b/src/x64/lithium-x64.cc
-@@ -1194,7 +1194,7 @@ LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
- 
- 
- LInstruction* LChunkBuilder::DoGlobalObject(HGlobalObject* instr) {
--  return DefineAsRegister(new LGlobalObject);
-+  return DefineAsRegister(new LGlobalObject(instr->qml_global()));
- }
- 
- 
-diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
-index 15bb894..16f754c 100644
---- a/src/x64/lithium-x64.h
-+++ b/src/x64/lithium-x64.h
-@@ -1365,7 +1365,13 @@ class LOuterContext: public LTemplateInstruction<1, 1, 0> {
- 
- class LGlobalObject: public LTemplateInstruction<1, 0, 0> {
-  public:
-+  explicit LGlobalObject(bool qml_global) : qml_global_(qml_global) {}
-+
-   DECLARE_CONCRETE_INSTRUCTION(GlobalObject, "global-object")
-+  
-+  bool qml_global() { return qml_global_; }
-+ private:
-+  bool qml_global_;
- };
- 
- 
-diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
-index 4c17720..aa284ed 100644
---- a/src/x64/macro-assembler-x64.h
-+++ b/src/x64/macro-assembler-x64.h
-@@ -1233,6 +1233,11 @@ static inline Operand GlobalObjectOperand() {
- }
- 
- 
-+static inline Operand QmlGlobalObjectOperand() {
-+  return ContextOperand(rsi, Context::QML_GLOBAL_INDEX);
-+}
-+
-+
- // Provides access to exit frame stack space (not GCed).
- static inline Operand StackSpaceOperand(int index) {
- #ifdef _WIN64
--- 
-1.7.4.4
-