[strong] Implement strong property access semantics

src/code-stubs.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/code-stubs.h"
 
 #include <sstream>
 
 #include "src/bootstrapper.h"
 #include "src/cpu-profiler.h"
@@ skipping 105 matching lines @@
     masm.set_generating_stub(true);
     // TODO(yangguo): remove this once we can serialize IC stubs.
     masm.enable_serializer();
     NoCurrentFrameScope scope(&masm);
     Generate(&masm);
   }
 
   // Create the code object.
   CodeDesc desc;
   masm.GetCode(&desc);
-
   // Copy the generated code into a heap object.
   Code::Flags flags = Code::ComputeFlags(
       GetCodeKind(),
       GetICState(),
       GetExtraICState(),
       GetStubType());
   Handle<Code> new_object = factory->NewCode(
       desc, flags, masm.CodeObject(), NeedsImmovableCode());
   return new_object;
 }
@@ skipping 484 matching lines @@
 
 void LoadDictionaryElementStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   descriptor->Initialize(FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure));
 }
 
 
 void KeyedLoadGenericStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   descriptor->Initialize(
-      Runtime::FunctionForId(Runtime::kKeyedGetProperty)->entry);
+      Runtime::FunctionForId(is_strong(language_mode())
+                                 ? Runtime::kKeyedGetPropertyStrong
+                                 : Runtime::kKeyedGetProperty)->entry);
 }
 
 
 void HandlerStub::InitializeDescriptor(CodeStubDescriptor* descriptor) {
   if (kind() == Code::STORE_IC) {
     descriptor->Initialize(FUNCTION_ADDR(StoreIC_MissFromStubFailure));
   } else if (kind() == Code::KEYED_LOAD_IC) {
     descriptor->Initialize(FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure));
   } else if (kind() == Code::KEYED_STORE_IC) {
     descriptor->Initialize(FUNCTION_ADDR(KeyedStoreIC_MissFromStubFailure));
@@ skipping 416 matching lines @@
 
   if (type->Is(Type::UntaggedPointer())) {
     return Representation::External();
   }
 
   DCHECK(!type->Is(Type::Untagged()));
   return Representation::Tagged();
 }
 }  // namespace internal
 }  // namespace v8