Revert "Update V8"

This reverts commit 1c4a5fcab76d1b769a4c0369d40dd0dd7c0e7495

Several of the qtdeclarative tests and examples are dying randomly with messages like this:
> 
> #
> # Fatal error in ../3rdparty/v8/src/objects-inl.h, line 2169
> # CHECK(object->IsJSFunction()) failed
> #
> 
> 
> ==== Stack trace ============================================
> 
> 
> ==== Details ================================================
> 
> ==== Key         ============================================
> 
> =====================
> 
> Aborted (core dumped)

Change-Id: Iebaa2497a6f6ef616ef4c3576c217d2a8a2c1ea5
Reviewed-by: Kent Hansen <kent.hansen@nokia.com>

1 files changed, 1856 insertions, 0 deletions

diff --git a/src/v8/0005-Introduce-a-QML-compilation-mode.patch b/src/v8/0005-Introduce-a-QML-compilation-mode.patch
new file mode 100644
index 0000000000..c5c36a1f95
--- /dev/null
+++ b/src/v8/0005-Introduce-a-QML-compilation-mode.patch
@@ -0,0 +1,1856 @@
+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
+