Getting rid of more TLS fetches

src/api.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 37 matching lines @@
 #include "version.h"
 #include "vm-state-inl.h"
 
 #include "../include/v8-profiler.h"
 #include "../include/v8-testing.h"
 
 #define LOG_API(isolate, expr) LOG(isolate, ApiEntryCall(expr))
 
 // TODO(isolates): avoid repeated TLS reads in function prologues.
 #ifdef ENABLE_VMSTATE_TRACKING
-#define ENTER_V8                                        \
-  ASSERT(i::Isolate::Current()->IsInitialized());                           \
-  i::VMState __state__(i::Isolate::Current(), i::OTHER)
-#define LEAVE_V8 \
-  i::VMState __state__(i::Isolate::Current(), i::EXTERNAL)
+#define ENTER_V8(isolate)                                        \
+  ASSERT((isolate)->IsInitialized());                           \
+  i::VMState __state__((isolate), i::OTHER)
+#define LEAVE_V8(isolate) \
+  i::VMState __state__((isolate), i::EXTERNAL)
 #else
-#define ENTER_V8 ((void) 0)
-#define LEAVE_V8 ((void) 0)
+#define ENTER_V8(isolate) ((void) 0)
+#define LEAVE_V8(isolate) ((void) 0)
 #endif
 
 namespace v8 {
 
 #define ON_BAILOUT(isolate, location, code)                        \
   if (IsDeadCheck(isolate, location) ||                            \
             v8::V8::IsExecutionTerminating()) {                    \
     code;                                                          \
     UNREACHABLE();                                                 \
   }
 
 
-#define EXCEPTION_PREAMBLE()                                                \
-  i::Isolate::Current()->handle_scope_implementer()->IncrementCallDepth();  \
-  ASSERT(!i::Isolate::Current()->external_caught_exception());              \
+#define EXCEPTION_PREAMBLE(isolate)                                         \
+  (isolate)->handle_scope_implementer()->IncrementCallDepth();              \
+  ASSERT(!(isolate)->external_caught_exception());                          \
   bool has_pending_exception = false
 
 
-#define EXCEPTION_BAILOUT_CHECK(value)                                         \
+#define EXCEPTION_BAILOUT_CHECK(isolate, value)                                \
   do {                                                                         \
     i::HandleScopeImplementer* handle_scope_implementer =                      \
-        isolate->handle_scope_implementer();                                   \
+        (isolate)->handle_scope_implementer();                                 \
     handle_scope_implementer->DecrementCallDepth();                            \
     if (has_pending_exception) {                                               \
       if (handle_scope_implementer->CallDepthIsZero() &&                       \
-          i::Isolate::Current()->is_out_of_memory()) {                         \
+          (isolate)->is_out_of_memory()) {                                     \
         if (!handle_scope_implementer->ignore_out_of_memory())                 \
           i::V8::FatalProcessOutOfMemory(NULL);                                \
       }                                                                        \
       bool call_depth_is_zero = handle_scope_implementer->CallDepthIsZero();   \
-      i::Isolate::Current()->OptionalRescheduleException(call_depth_is_zero);  \
+      (isolate)->OptionalRescheduleException(call_depth_is_zero);              \
       return value;                                                            \
     }                                                                          \
   } while (false)
 
 // TODO(isolates): Add a parameter to this macro for an isolate.
 
 #define API_ENTRY_CHECK(msg)                                                   \
   do {                                                                         \
     if (v8::Locker::IsActive()) {                                              \
       ApiCheck(i::Isolate::Current()->thread_manager()->                       \
@@ skipping 77 matching lines @@
   intptr_t memory_allocator_capacity;
   heap_stats.memory_allocator_capacity = &memory_allocator_capacity;
   int objects_per_type[LAST_TYPE + 1] = {0};
   heap_stats.objects_per_type = objects_per_type;
   int size_per_type[LAST_TYPE + 1] = {0};
   heap_stats.size_per_type = size_per_type;
   int os_error;
   heap_stats.os_error = &os_error;
   int end_marker;
   heap_stats.end_marker = &end_marker;
-  HEAP->RecordStats(&heap_stats, take_snapshot);
+  i::Isolate* isolate = i::Isolate::Current();
+  isolate->heap()->RecordStats(&heap_stats, take_snapshot);
   i::V8::SetFatalError();
   FatalErrorCallback callback = GetFatalErrorHandler();
   {
-    LEAVE_V8;
+    LEAVE_V8(isolate);
     callback(location, "Allocation failed - process out of memory");
   }
   // If the callback returns, we stop execution.
   UNREACHABLE();
 }
 
 
 bool Utils::ReportApiFailure(const char* location, const char* message) {
   FatalErrorCallback callback = GetFatalErrorHandler();
   callback(location, message);
@@ skipping 66 matching lines @@
 
 static inline bool EnsureInitializedForIsolate(i::Isolate* isolate,
                                                const char* location) {
   if (IsDeadCheck(isolate, location)) return false;
   if (isolate != NULL) {
     if (isolate->IsInitialized()) return true;
   }
   return ApiCheck(InitializeHelper(), location, "Error initializing V8");
 }
 
-static inline bool EnsureInitialized(const char* location) {
-  i::Isolate* isolate = i::Isolate::UncheckedCurrent();
-  return EnsureInitializedForIsolate(isolate, location);
-}
-
 // Some initializing API functions are called early and may be
 // called on a thread different from static initializer thread.
 // If Isolate API is used, Isolate::Enter() will initialize TLS so
 // Isolate::Current() works. If it's a legacy case, then the thread
 // may not have TLS initialized yet. However, in initializing APIs it
 // may be too early to call EnsureInitialized() - some pre-init
 // parameters still have to be configured.
 static inline i::Isolate* EnterIsolateIfNeeded() {
   i::Isolate* isolate = i::Isolate::UncheckedCurrent();
   if (isolate != NULL)
@@ skipping 13 matching lines @@
 
 #ifdef DEBUG
 void ImplementationUtilities::ZapHandleRange(i::Object** begin,
                                              i::Object** end) {
   i::HandleScope::ZapRange(begin, end);
 }
 #endif
 
 
 v8::Handle<v8::Primitive> ImplementationUtilities::Undefined() {
-  if (!EnsureInitialized("v8::Undefined()")) return v8::Handle<v8::Primitive>();
-  return v8::Handle<Primitive>(ToApi<Primitive>(FACTORY->undefined_value()));
+  i::Isolate* isolate = i::Isolate::Current();
+  if (!EnsureInitializedForIsolate(isolate, "v8::Undefined()")) {
+    return v8::Handle<v8::Primitive>();
+  }
+  return v8::Handle<Primitive>(ToApi<Primitive>(
+      isolate->factory()->undefined_value()));
 }
 
 
 v8::Handle<v8::Primitive> ImplementationUtilities::Null() {
   i::Isolate* isolate = i::Isolate::UncheckedCurrent();
   if (!EnsureInitializedForIsolate(isolate, "v8::Null()"))
       return v8::Handle<v8::Primitive>();
   return v8::Handle<Primitive>(
       ToApi<Primitive>(isolate->factory()->null_value()));
 }
 
 
 v8::Handle<v8::Boolean> ImplementationUtilities::True() {
-  if (!EnsureInitialized("v8::True()")) return v8::Handle<v8::Boolean>();
-  return v8::Handle<v8::Boolean>(ToApi<Boolean>(FACTORY->true_value()));
+  i::Isolate* isolate = i::Isolate::Current();
+  if (!EnsureInitializedForIsolate(isolate, "v8::True()")) {
+    return v8::Handle<v8::Boolean>();
+  }
+  return v8::Handle<v8::Boolean>(ToApi<Boolean>(
+      isolate->factory()->true_value()));
 }
 
 
 v8::Handle<v8::Boolean> ImplementationUtilities::False() {
-  if (!EnsureInitialized("v8::False()")) return v8::Handle<v8::Boolean>();
-  return v8::Handle<v8::Boolean>(ToApi<Boolean>(FACTORY->false_value()));
+  i::Isolate* isolate = i::Isolate::Current();
+  if (!EnsureInitializedForIsolate(isolate, "v8::False()")) {
+    return v8::Handle<v8::Boolean>();
+  }
+  return v8::Handle<v8::Boolean>(ToApi<Boolean>(
+      isolate->factory()->false_value()));
 }
 
 void V8::SetFlagsFromString(const char* str, int length) {
   i::FlagList::SetFlagsFromString(str, length);
 }
 
 
 void V8::SetFlagsFromCommandLine(int* argc, char** argv, bool remove_flags) {
   i::FlagList::SetFlagsFromCommandLine(argc, argv, remove_flags);
 }
 
 
 v8::Handle<Value> ThrowException(v8::Handle<v8::Value> value) {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::ThrowException()")) {
     return v8::Handle<Value>();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   // If we're passed an empty handle, we throw an undefined exception
   // to deal more gracefully with out of memory situations.
   if (value.IsEmpty()) {
     isolate->ScheduleThrow(HEAP->undefined_value());
   } else {
     isolate->ScheduleThrow(*Utils::OpenHandle(*value));
   }
   return v8::Undefined();
 }
 
@@ skipping 169 matching lines @@
     i::HandleScope::DeleteExtensions(isolate_);
   }
 
 #ifdef DEBUG
   i::HandleScope::ZapRange(prev_next_, prev_limit_);
 #endif
 }
 
 
 int HandleScope::NumberOfHandles() {
-  EnsureInitialized("HandleScope::NumberOfHandles");
+  EnsureInitializedForIsolate(
+      i::Isolate::Current(), "HandleScope::NumberOfHandles");
   return i::HandleScope::NumberOfHandles();
 }
 
 
 i::Object** HandleScope::CreateHandle(i::Object* value) {
   return i::HandleScope::CreateHandle(value, i::Isolate::Current());
 }
 
 
 i::Object** HandleScope::CreateHandle(i::HeapObject* value) {
   ASSERT(value->IsHeapObject());
   return reinterpret_cast<i::Object**>(
       i::HandleScope::CreateHandle(value, value->GetIsolate()));
 }
 
 
 void Context::Enter() {
   // TODO(isolates): Context should have a pointer to isolate.
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::Context::Enter()")) return;
-  ENTER_V8;
+  ENTER_V8(isolate);
+
   i::Handle<i::Context> env = Utils::OpenHandle(this);
   isolate->handle_scope_implementer()->EnterContext(env);
 
   isolate->handle_scope_implementer()->SaveContext(isolate->context());
   isolate->set_context(*env);
 }
 
 
 void Context::Exit() {
   // TODO(isolates): Context should have a pointer to isolate.
@@ skipping 10 matching lines @@
   i::Context* last_context =
       isolate->handle_scope_implementer()->RestoreContext();
   isolate->set_context(last_context);
 }
 
 
 void Context::SetData(v8::Handle<String> data) {
   // TODO(isolates): Context should have a pointer to isolate.
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::Context::SetData()")) return;
-  ENTER_V8;
+  ENTER_V8(isolate);
   {
     i::HandleScope scope(isolate);
     i::Handle<i::Context> env = Utils::OpenHandle(this);
     i::Handle<i::Object> raw_data = Utils::OpenHandle(*data);
     ASSERT(env->IsGlobalContext());
     if (env->IsGlobalContext()) {
       env->set_data(*raw_data);
     }
   }
 }
 
 
 v8::Local<v8::Value> Context::GetData() {
   // TODO(isolates): Context should have a pointer to isolate.
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::Context::GetData()")) {
     return v8::Local<Value>();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Object* raw_result = NULL;
   {
     i::HandleScope scope(isolate);
     i::Handle<i::Context> env = Utils::OpenHandle(this);
     ASSERT(env->IsGlobalContext());
     if (env->IsGlobalContext()) {
       raw_result = env->data();
     } else {
       return Local<Value>();
     }
@@ skipping 31 matching lines @@
 
 // --- N e a n d e r ---
 
 
 // A constructor cannot easily return an error value, therefore it is necessary
 // to check for a dead VM with ON_BAILOUT before constructing any Neander
 // objects.  To remind you about this there is no HandleScope in the
 // NeanderObject constructor.  When you add one to the site calling the
 // constructor you should check that you ensured the VM was not dead first.
 NeanderObject::NeanderObject(int size) {
-  EnsureInitialized("v8::Nowhere");
-  ENTER_V8;
-  value_ = FACTORY->NewNeanderObject();
-  i::Handle<i::FixedArray> elements = FACTORY->NewFixedArray(size);
+  i::Isolate* isolate = i::Isolate::Current();
+  EnsureInitializedForIsolate(isolate, "v8::Nowhere");
+  ENTER_V8(isolate);
+  value_ = isolate->factory()->NewNeanderObject();
+  i::Handle<i::FixedArray> elements = isolate->factory()->NewFixedArray(size);
   value_->set_elements(*elements);
 }
 
 
 int NeanderObject::size() {
   return i::FixedArray::cast(value_->elements())->length();
 }
 
 
 NeanderArray::NeanderArray() : obj_(2) {
@@ skipping 43 matching lines @@
 
 static void InitializeTemplate(i::Handle<i::TemplateInfo> that, int type) {
   that->set_tag(i::Smi::FromInt(type));
 }
 
 
 void Template::Set(v8::Handle<String> name, v8::Handle<Data> value,
                    v8::PropertyAttribute attribute) {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::Template::Set()")) return;
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::Object> list(Utils::OpenHandle(this)->property_list());
   if (list->IsUndefined()) {
     list = NeanderArray().value();
     Utils::OpenHandle(this)->set_property_list(*list);
   }
   NeanderArray array(list);
   array.add(Utils::OpenHandle(*name));
   array.add(Utils::OpenHandle(*value));
   array.add(Utils::OpenHandle(*v8::Integer::New(attribute)));
 }
 
 
 // --- F u n c t i o n   T e m p l a t e ---
 static void InitializeFunctionTemplate(
       i::Handle<i::FunctionTemplateInfo> info) {
   info->set_tag(i::Smi::FromInt(Consts::FUNCTION_TEMPLATE));
   info->set_flag(0);
 }
 
 
 Local<ObjectTemplate> FunctionTemplate::PrototypeTemplate() {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::FunctionTemplate::PrototypeTemplate()")) {
     return Local<ObjectTemplate>();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Object> result(Utils::OpenHandle(this)->prototype_template());
   if (result->IsUndefined()) {
     result = Utils::OpenHandle(*ObjectTemplate::New());
     Utils::OpenHandle(this)->set_prototype_template(*result);
   }
   return Local<ObjectTemplate>(ToApi<ObjectTemplate>(result));
 }
 
 
 void FunctionTemplate::Inherit(v8::Handle<FunctionTemplate> value) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::FunctionTemplate::Inherit()")) return;
-  ENTER_V8;
+  ENTER_V8(isolate);
   Utils::OpenHandle(this)->set_parent_template(*Utils::OpenHandle(*value));
 }
 
 
 Local<FunctionTemplate> FunctionTemplate::New(InvocationCallback callback,
     v8::Handle<Value> data, v8::Handle<Signature> signature) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::FunctionTemplate::New()");
   LOG_API(isolate, "FunctionTemplate::New");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Struct> struct_obj =
-      FACTORY->NewStruct(i::FUNCTION_TEMPLATE_INFO_TYPE);
+      isolate->factory()->NewStruct(i::FUNCTION_TEMPLATE_INFO_TYPE);
   i::Handle<i::FunctionTemplateInfo> obj =
       i::Handle<i::FunctionTemplateInfo>::cast(struct_obj);
   InitializeFunctionTemplate(obj);
   int next_serial_number = isolate->next_serial_number();
   isolate->set_next_serial_number(next_serial_number + 1);
   obj->set_serial_number(i::Smi::FromInt(next_serial_number));
   if (callback != 0) {
     if (data.IsEmpty()) data = v8::Undefined();
     Utils::ToLocal(obj)->SetCallHandler(callback, data);
   }
   obj->set_undetectable(false);
   obj->set_needs_access_check(false);
 
   if (!signature.IsEmpty())
     obj->set_signature(*Utils::OpenHandle(*signature));
   return Utils::ToLocal(obj);
 }
 
 
 Local<Signature> Signature::New(Handle<FunctionTemplate> receiver,
       int argc, Handle<FunctionTemplate> argv[]) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Signature::New()");
   LOG_API(isolate, "Signature::New");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Struct> struct_obj =
       FACTORY->NewStruct(i::SIGNATURE_INFO_TYPE);
   i::Handle<i::SignatureInfo> obj =
       i::Handle<i::SignatureInfo>::cast(struct_obj);
   if (!receiver.IsEmpty()) obj->set_receiver(*Utils::OpenHandle(*receiver));
   if (argc > 0) {
     i::Handle<i::FixedArray> args = FACTORY->NewFixedArray(argc);
     for (int i = 0; i < argc; i++) {
       if (!argv[i].IsEmpty())
         args->set(i, *Utils::OpenHandle(*argv[i]));
     }
     obj->set_args(*args);
   }
   return Utils::ToLocal(obj);
 }
 
 
 Local<TypeSwitch> TypeSwitch::New(Handle<FunctionTemplate> type) {
   Handle<FunctionTemplate> types[1] = { type };
   return TypeSwitch::New(1, types);
 }
 
 
 Local<TypeSwitch> TypeSwitch::New(int argc, Handle<FunctionTemplate> types[]) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::TypeSwitch::New()");
   LOG_API(isolate, "TypeSwitch::New");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::FixedArray> vector = isolate->factory()->NewFixedArray(argc);
   for (int i = 0; i < argc; i++)
     vector->set(i, *Utils::OpenHandle(*types[i]));
   i::Handle<i::Struct> struct_obj =
       isolate->factory()->NewStruct(i::TYPE_SWITCH_INFO_TYPE);
   i::Handle<i::TypeSwitchInfo> obj =
       i::Handle<i::TypeSwitchInfo>::cast(struct_obj);
   obj->set_types(*vector);
   return Utils::ToLocal(obj);
 }
@@ skipping 14 matching lines @@
 
 
 #define SET_FIELD_WRAPPED(obj, setter, cdata) do {  \
     i::Handle<i::Object> proxy = FromCData(cdata);  \
     (obj)->setter(*proxy);                          \
   } while (false)
 
 
 void FunctionTemplate::SetCallHandler(InvocationCallback callback,
                                       v8::Handle<Value> data) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::FunctionTemplate::SetCallHandler()")) return;
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::Struct> struct_obj =
       FACTORY->NewStruct(i::CALL_HANDLER_INFO_TYPE);
   i::Handle<i::CallHandlerInfo> obj =
       i::Handle<i::CallHandlerInfo>::cast(struct_obj);
   SET_FIELD_WRAPPED(obj, set_callback, callback);
   if (data.IsEmpty()) data = v8::Undefined();
   obj->set_data(*Utils::OpenHandle(*data));
   Utils::OpenHandle(this)->set_call_code(*obj);
 }
@@ skipping 21 matching lines @@
 }
 
 
 void FunctionTemplate::AddInstancePropertyAccessor(
       v8::Handle<String> name,
       AccessorGetter getter,
       AccessorSetter setter,
       v8::Handle<Value> data,
       v8::AccessControl settings,
       v8::PropertyAttribute attributes) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate,
                   "v8::FunctionTemplate::AddInstancePropertyAccessor()")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
 
   i::Handle<i::AccessorInfo> obj = MakeAccessorInfo(name,
                                                     getter, setter, data,
                                                     settings, attributes);
   i::Handle<i::Object> list(Utils::OpenHandle(this)->property_accessors());
   if (list->IsUndefined()) {
     list = NeanderArray().value();
     Utils::OpenHandle(this)->set_property_accessors(*list);
   }
   NeanderArray array(list);
   array.add(obj);
 }
 
 
 Local<ObjectTemplate> FunctionTemplate::InstanceTemplate() {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::FunctionTemplate::InstanceTemplate()")
       || EmptyCheck("v8::FunctionTemplate::InstanceTemplate()", this))
     return Local<ObjectTemplate>();
-  ENTER_V8;
+  ENTER_V8(isolate);
   if (Utils::OpenHandle(this)->instance_template()->IsUndefined()) {
     Local<ObjectTemplate> templ =
         ObjectTemplate::New(v8::Handle<FunctionTemplate>(this));
     Utils::OpenHandle(this)->set_instance_template(*Utils::OpenHandle(*templ));
   }
   i::Handle<i::ObjectTemplateInfo> result(i::ObjectTemplateInfo::cast(
         Utils::OpenHandle(this)->instance_template()));
   return Utils::ToLocal(result);
 }
 
 
 void FunctionTemplate::SetClassName(Handle<String> name) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::FunctionTemplate::SetClassName()")) return;
-  ENTER_V8;
+  ENTER_V8(isolate);
   Utils::OpenHandle(this)->set_class_name(*Utils::OpenHandle(*name));
 }
 
 
 void FunctionTemplate::SetHiddenPrototype(bool value) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::FunctionTemplate::SetHiddenPrototype()")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   Utils::OpenHandle(this)->set_hidden_prototype(value);
 }
 
 
 void FunctionTemplate::SetNamedInstancePropertyHandler(
       NamedPropertyGetter getter,
       NamedPropertySetter setter,
       NamedPropertyQuery query,
       NamedPropertyDeleter remover,
       NamedPropertyEnumerator enumerator,
       Handle<Value> data) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate,
                   "v8::FunctionTemplate::SetNamedInstancePropertyHandler()")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::Struct> struct_obj =
       isolate->factory()->NewStruct(i::INTERCEPTOR_INFO_TYPE);
   i::Handle<i::InterceptorInfo> obj =
       i::Handle<i::InterceptorInfo>::cast(struct_obj);
 
   if (getter != 0) SET_FIELD_WRAPPED(obj, set_getter, getter);
   if (setter != 0) SET_FIELD_WRAPPED(obj, set_setter, setter);
   if (query != 0) SET_FIELD_WRAPPED(obj, set_query, query);
   if (remover != 0) SET_FIELD_WRAPPED(obj, set_deleter, remover);
   if (enumerator != 0) SET_FIELD_WRAPPED(obj, set_enumerator, enumerator);
 
   if (data.IsEmpty()) data = v8::Undefined();
   obj->set_data(*Utils::OpenHandle(*data));
   Utils::OpenHandle(this)->set_named_property_handler(*obj);
 }
 
 
 void FunctionTemplate::SetIndexedInstancePropertyHandler(
       IndexedPropertyGetter getter,
       IndexedPropertySetter setter,
       IndexedPropertyQuery query,
       IndexedPropertyDeleter remover,
       IndexedPropertyEnumerator enumerator,
       Handle<Value> data) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate,
         "v8::FunctionTemplate::SetIndexedInstancePropertyHandler()")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::Struct> struct_obj =
       isolate->factory()->NewStruct(i::INTERCEPTOR_INFO_TYPE);
   i::Handle<i::InterceptorInfo> obj =
       i::Handle<i::InterceptorInfo>::cast(struct_obj);
 
   if (getter != 0) SET_FIELD_WRAPPED(obj, set_getter, getter);
   if (setter != 0) SET_FIELD_WRAPPED(obj, set_setter, setter);
   if (query != 0) SET_FIELD_WRAPPED(obj, set_query, query);
   if (remover != 0) SET_FIELD_WRAPPED(obj, set_deleter, remover);
   if (enumerator != 0) SET_FIELD_WRAPPED(obj, set_enumerator, enumerator);
 
   if (data.IsEmpty()) data = v8::Undefined();
   obj->set_data(*Utils::OpenHandle(*data));
   Utils::OpenHandle(this)->set_indexed_property_handler(*obj);
 }
 
 
 void FunctionTemplate::SetInstanceCallAsFunctionHandler(
       InvocationCallback callback,
       Handle<Value> data) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate,
                   "v8::FunctionTemplate::SetInstanceCallAsFunctionHandler()")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::Struct> struct_obj =
       isolate->factory()->NewStruct(i::CALL_HANDLER_INFO_TYPE);
   i::Handle<i::CallHandlerInfo> obj =
       i::Handle<i::CallHandlerInfo>::cast(struct_obj);
   SET_FIELD_WRAPPED(obj, set_callback, callback);
   if (data.IsEmpty()) data = v8::Undefined();
   obj->set_data(*Utils::OpenHandle(*data));
   Utils::OpenHandle(this)->set_instance_call_handler(*obj);
 }
 
 
 // --- O b j e c t T e m p l a t e ---
 
 
 Local<ObjectTemplate> ObjectTemplate::New() {
   return New(Local<FunctionTemplate>());
 }
 
 
 Local<ObjectTemplate> ObjectTemplate::New(
       v8::Handle<FunctionTemplate> constructor) {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::ObjectTemplate::New()")) {
     return Local<ObjectTemplate>();
   }
   EnsureInitializedForIsolate(isolate, "v8::ObjectTemplate::New()");
   LOG_API(isolate, "ObjectTemplate::New");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Struct> struct_obj =
-      FACTORY->NewStruct(i::OBJECT_TEMPLATE_INFO_TYPE);
+      isolate->factory()->NewStruct(i::OBJECT_TEMPLATE_INFO_TYPE);
   i::Handle<i::ObjectTemplateInfo> obj =
       i::Handle<i::ObjectTemplateInfo>::cast(struct_obj);
   InitializeTemplate(obj, Consts::OBJECT_TEMPLATE);
   if (!constructor.IsEmpty())
     obj->set_constructor(*Utils::OpenHandle(*constructor));
   obj->set_internal_field_count(i::Smi::FromInt(0));
   return Utils::ToLocal(obj);
 }
 
 
 // Ensure that the object template has a constructor.  If no
 // constructor is available we create one.
 static void EnsureConstructor(ObjectTemplate* object_template) {
   if (Utils::OpenHandle(object_template)->constructor()->IsUndefined()) {
     Local<FunctionTemplate> templ = FunctionTemplate::New();
     i::Handle<i::FunctionTemplateInfo> constructor = Utils::OpenHandle(*templ);
     constructor->set_instance_template(*Utils::OpenHandle(object_template));
     Utils::OpenHandle(object_template)->set_constructor(*constructor);
   }
 }
 
 
 void ObjectTemplate::SetAccessor(v8::Handle<String> name,
                                  AccessorGetter getter,
                                  AccessorSetter setter,
                                  v8::Handle<Value> data,
                                  AccessControl settings,
                                  PropertyAttribute attribute) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetAccessor()")) return;
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   EnsureConstructor(this);
   i::FunctionTemplateInfo* constructor =
       i::FunctionTemplateInfo::cast(Utils::OpenHandle(this)->constructor());
   i::Handle<i::FunctionTemplateInfo> cons(constructor);
   Utils::ToLocal(cons)->AddInstancePropertyAccessor(name,
                                                     getter,
                                                     setter,
                                                     data,
                                                     settings,
                                                     attribute);
 }
 
 
 void ObjectTemplate::SetNamedPropertyHandler(NamedPropertyGetter getter,
                                              NamedPropertySetter setter,
                                              NamedPropertyQuery query,
                                              NamedPropertyDeleter remover,
                                              NamedPropertyEnumerator enumerator,
                                              Handle<Value> data) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetNamedPropertyHandler()")) {
     return;
   }
-  ENTER_V8;
-  HandleScope scope;
+  ENTER_V8(isolate);
+  i::HandleScope scope(isolate);
   EnsureConstructor(this);
   i::FunctionTemplateInfo* constructor =
       i::FunctionTemplateInfo::cast(Utils::OpenHandle(this)->constructor());
   i::Handle<i::FunctionTemplateInfo> cons(constructor);
   Utils::ToLocal(cons)->SetNamedInstancePropertyHandler(getter,
                                                         setter,
                                                         query,
                                                         remover,
                                                         enumerator,
                                                         data);
 }
 
 
 void ObjectTemplate::MarkAsUndetectable() {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::ObjectTemplate::MarkAsUndetectable()")) return;
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   EnsureConstructor(this);
   i::FunctionTemplateInfo* constructor =
       i::FunctionTemplateInfo::cast(Utils::OpenHandle(this)->constructor());
   i::Handle<i::FunctionTemplateInfo> cons(constructor);
   cons->set_undetectable(true);
 }
 
 
 void ObjectTemplate::SetAccessCheckCallbacks(
       NamedSecurityCallback named_callback,
       IndexedSecurityCallback indexed_callback,
       Handle<Value> data,
       bool turned_on_by_default) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetAccessCheckCallbacks()")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   EnsureConstructor(this);
 
   i::Handle<i::Struct> struct_info =
       FACTORY->NewStruct(i::ACCESS_CHECK_INFO_TYPE);
   i::Handle<i::AccessCheckInfo> info =
       i::Handle<i::AccessCheckInfo>::cast(struct_info);
 
   SET_FIELD_WRAPPED(info, set_named_callback, named_callback);
   SET_FIELD_WRAPPED(info, set_indexed_callback, indexed_callback);
 
   if (data.IsEmpty()) data = v8::Undefined();
   info->set_data(*Utils::OpenHandle(*data));
 
   i::FunctionTemplateInfo* constructor =
       i::FunctionTemplateInfo::cast(Utils::OpenHandle(this)->constructor());
   i::Handle<i::FunctionTemplateInfo> cons(constructor);
   cons->set_access_check_info(*info);
   cons->set_needs_access_check(turned_on_by_default);
 }
 
 
 void ObjectTemplate::SetIndexedPropertyHandler(
       IndexedPropertyGetter getter,
       IndexedPropertySetter setter,
       IndexedPropertyQuery query,
       IndexedPropertyDeleter remover,
       IndexedPropertyEnumerator enumerator,
       Handle<Value> data) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetIndexedPropertyHandler()")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   EnsureConstructor(this);
   i::FunctionTemplateInfo* constructor =
       i::FunctionTemplateInfo::cast(Utils::OpenHandle(this)->constructor());
   i::Handle<i::FunctionTemplateInfo> cons(constructor);
   Utils::ToLocal(cons)->SetIndexedInstancePropertyHandler(getter,
                                                           setter,
                                                           query,
                                                           remover,
                                                           enumerator,
                                                           data);
 }
 
 
 void ObjectTemplate::SetCallAsFunctionHandler(InvocationCallback callback,
                                               Handle<Value> data) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate,
                   "v8::ObjectTemplate::SetCallAsFunctionHandler()")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   EnsureConstructor(this);
   i::FunctionTemplateInfo* constructor =
       i::FunctionTemplateInfo::cast(Utils::OpenHandle(this)->constructor());
   i::Handle<i::FunctionTemplateInfo> cons(constructor);
   Utils::ToLocal(cons)->SetInstanceCallAsFunctionHandler(callback, data);
 }
 
 
 int ObjectTemplate::InternalFieldCount() {
-  if (IsDeadCheck(i::Isolate::Current(),
+  if (IsDeadCheck(Utils::OpenHandle(this)->GetIsolate(),
                   "v8::ObjectTemplate::InternalFieldCount()")) {
     return 0;
   }
   return i::Smi::cast(Utils::OpenHandle(this)->internal_field_count())->value();
 }
 
 
 void ObjectTemplate::SetInternalFieldCount(int value) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetInternalFieldCount()")) {
     return;
   }
   if (!ApiCheck(i::Smi::IsValid(value),
                 "v8::ObjectTemplate::SetInternalFieldCount()",
                 "Invalid internal field count")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   if (value > 0) {
     // The internal field count is set by the constructor function's
     // construct code, so we ensure that there is a constructor
     // function to do the setting.
     EnsureConstructor(this);
   }
   Utils::OpenHandle(this)->set_internal_field_count(i::Smi::FromInt(value));
 }
 
 
@@ skipping 44 matching lines @@
 // --- S c r i p t ---
 
 
 Local<Script> Script::New(v8::Handle<String> source,
                           v8::ScriptOrigin* origin,
                           v8::ScriptData* pre_data,
                           v8::Handle<String> script_data) {
   i::Isolate* isolate = i::Isolate::Current();
   ON_BAILOUT(isolate, "v8::Script::New()", return Local<Script>());
   LOG_API(isolate, "Script::New");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::String> str = Utils::OpenHandle(*source);
   i::Handle<i::Object> name_obj;
   int line_offset = 0;
   int column_offset = 0;
   if (origin != NULL) {
     if (!origin->ResourceName().IsEmpty()) {
       name_obj = Utils::OpenHandle(*origin->ResourceName());
     }
     if (!origin->ResourceLineOffset().IsEmpty()) {
       line_offset = static_cast<int>(origin->ResourceLineOffset()->Value());
     }
     if (!origin->ResourceColumnOffset().IsEmpty()) {
       column_offset = static_cast<int>(origin->ResourceColumnOffset()->Value());
     }
   }
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::ScriptDataImpl* pre_data_impl = static_cast<i::ScriptDataImpl*>(pre_data);
   // We assert that the pre-data is sane, even though we can actually
   // handle it if it turns out not to be in release mode.
   ASSERT(pre_data_impl == NULL || pre_data_impl->SanityCheck());
   // If the pre-data isn't sane we simply ignore it
   if (pre_data_impl != NULL && !pre_data_impl->SanityCheck()) {
     pre_data_impl = NULL;
   }
   i::Handle<i::SharedFunctionInfo> result =
       i::Compiler::Compile(str,
                            name_obj,
                            line_offset,
                            column_offset,
                            NULL,
                            pre_data_impl,
                            Utils::OpenHandle(*script_data),
                            i::NOT_NATIVES_CODE);
   has_pending_exception = result.is_null();
-  EXCEPTION_BAILOUT_CHECK(Local<Script>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<Script>());
   return Local<Script>(ToApi<Script>(result));
 }
 
 
 Local<Script> Script::New(v8::Handle<String> source,
                           v8::Handle<Value> file_name) {
   ScriptOrigin origin(file_name);
   return New(source, &origin);
 }
 
 
 Local<Script> Script::Compile(v8::Handle<String> source,
                               v8::ScriptOrigin* origin,
                               v8::ScriptData* pre_data,
                               v8::Handle<String> script_data) {
   i::Isolate* isolate = i::Isolate::Current();
   ON_BAILOUT(isolate, "v8::Script::Compile()", return Local<Script>());
   LOG_API(isolate, "Script::Compile");
-  ENTER_V8;
+  ENTER_V8(isolate);
   Local<Script> generic = New(source, origin, pre_data, script_data);
   if (generic.IsEmpty())
     return generic;
   i::Handle<i::Object> obj = Utils::OpenHandle(*generic);
   i::Handle<i::SharedFunctionInfo> function =
       i::Handle<i::SharedFunctionInfo>(i::SharedFunctionInfo::cast(*obj));
   i::Handle<i::JSFunction> result =
-      FACTORY->NewFunctionFromSharedFunctionInfo(
+      isolate->factory()->NewFunctionFromSharedFunctionInfo(
           function,
-          i::Isolate::Current()->global_context());
+          isolate->global_context());
   return Local<Script>(ToApi<Script>(result));
 }
 
 
 Local<Script> Script::Compile(v8::Handle<String> source,
                               v8::Handle<Value> file_name,
                               v8::Handle<String> script_data) {
   ScriptOrigin origin(file_name);
   return Compile(source, &origin, 0, script_data);
 }
 
 
 Local<Value> Script::Run() {
   i::Isolate* isolate = i::Isolate::Current();
   ON_BAILOUT(isolate, "v8::Script::Run()", return Local<Value>());
   LOG_API(isolate, "Script::Run");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Object* raw_result = NULL;
   {
     HandleScope scope;
     i::Handle<i::Object> obj = Utils::OpenHandle(this);
     i::Handle<i::JSFunction> fun;
     if (obj->IsSharedFunctionInfo()) {
       i::Handle<i::SharedFunctionInfo>
           function_info(i::SharedFunctionInfo::cast(*obj));
       fun = FACTORY->NewFunctionFromSharedFunctionInfo(
           function_info, i::Isolate::Current()->global_context());
     } else {
       fun = i::Handle<i::JSFunction>(i::JSFunction::cast(*obj));
     }
-    EXCEPTION_PREAMBLE();
+    EXCEPTION_PREAMBLE(isolate);
     i::Handle<i::Object> receiver(
         i::Isolate::Current()->context()->global_proxy());
     i::Handle<i::Object> result =
         i::Execution::Call(fun, receiver, 0, NULL, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(Local<Value>());
+    EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
     raw_result = *result;
   }
   i::Handle<i::Object> result(raw_result);
   return Utils::ToLocal(result);
 }
 
 
 static i::Handle<i::SharedFunctionInfo> OpenScript(Script* script) {
   i::Handle<i::Object> obj = Utils::OpenHandle(script);
   i::Handle<i::SharedFunctionInfo> result;
@@ skipping 133 matching lines @@
 
 void v8::TryCatch::SetCaptureMessage(bool value) {
   capture_message_ = value;
 }
 
 
 // --- M e s s a g e ---
 
 
 Local<String> Message::Get() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Message::Get()", return Local<String>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   HandleScope scope;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::String> raw_result = i::MessageHandler::GetMessage(obj);
   Local<String> result = Utils::ToLocal(raw_result);
   return scope.Close(result);
 }
 
 
 v8::Handle<Value> Message::GetScriptResourceName() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::Message::GetScriptResourceName()")) {
     return Local<String>();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   HandleScope scope;
   i::Handle<i::JSMessageObject> message =
       i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
   // Return this.script.name.
   i::Handle<i::JSValue> script =
       i::Handle<i::JSValue>::cast(i::Handle<i::Object>(message->script()));
   i::Handle<i::Object> resource_name(i::Script::cast(script->value())->name());
   return scope.Close(Utils::ToLocal(resource_name));
 }
 
 
 v8::Handle<Value> Message::GetScriptData() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::Message::GetScriptResourceData()")) {
     return Local<Value>();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   HandleScope scope;
   i::Handle<i::JSMessageObject> message =
       i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
   // Return this.script.data.
   i::Handle<i::JSValue> script =
       i::Handle<i::JSValue>::cast(i::Handle<i::Object>(message->script()));
   i::Handle<i::Object> data(i::Script::cast(script->value())->data());
   return scope.Close(Utils::ToLocal(data));
 }
 
 
 v8::Handle<v8::StackTrace> Message::GetStackTrace() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::Message::GetStackTrace()")) {
     return Local<v8::StackTrace>();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   HandleScope scope;
   i::Handle<i::JSMessageObject> message =
       i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
   i::Handle<i::Object> stackFramesObj(message->stack_frames());
   if (!stackFramesObj->IsJSArray()) return v8::Handle<v8::StackTrace>();
   i::Handle<i::JSArray> stackTrace =
       i::Handle<i::JSArray>::cast(stackFramesObj);
   return scope.Close(Utils::StackTraceToLocal(stackTrace));
 }
 
@@ skipping 21 matching lines @@
   i::Object** argv[1] = { data.location() };
   return CallV8HeapFunction(name,
                             i::Isolate::Current()->js_builtins_object(),
                             1,
                             argv,
                             has_pending_exception);
 }
 
 
 int Message::GetLineNumber() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Message::GetLineNumber()", return kNoLineNumberInfo);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
 
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> result = CallV8HeapFunction("GetLineNumber",
                                                    Utils::OpenHandle(this),
                                                    &has_pending_exception);
-  EXCEPTION_BAILOUT_CHECK(0);
+  EXCEPTION_BAILOUT_CHECK(isolate, 0);
   return static_cast<int>(result->Number());
 }
 
 
 int Message::GetStartPosition() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::Message::GetStartPosition()")) return 0;
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSMessageObject> message =
       i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
   return message->start_position();
 }
 
 
 int Message::GetEndPosition() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::Message::GetEndPosition()")) return 0;
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSMessageObject> message =
       i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
   return message->end_position();
 }
 
 
 int Message::GetStartColumn() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::Message::GetStartColumn()")) {
     return kNoColumnInfo;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> data_obj = Utils::OpenHandle(this);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> start_col_obj = CallV8HeapFunction(
       "GetPositionInLine",
       data_obj,
       &has_pending_exception);
-  EXCEPTION_BAILOUT_CHECK(0);
+  EXCEPTION_BAILOUT_CHECK(isolate, 0);
   return static_cast<int>(start_col_obj->Number());
 }
 
 
 int Message::GetEndColumn() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::Message::GetEndColumn()")) return kNoColumnInfo;
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> data_obj = Utils::OpenHandle(this);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> start_col_obj = CallV8HeapFunction(
       "GetPositionInLine",
       data_obj,
       &has_pending_exception);
-  EXCEPTION_BAILOUT_CHECK(0);
+  EXCEPTION_BAILOUT_CHECK(isolate, 0);
   i::Handle<i::JSMessageObject> message =
       i::Handle<i::JSMessageObject>::cast(data_obj);
   int start = message->start_position();
   int end = message->end_position();
   return static_cast<int>(start_col_obj->Number()) + (end - start);
 }
 
 
 Local<String> Message::GetSourceLine() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Message::GetSourceLine()", return Local<String>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   HandleScope scope;
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> result = CallV8HeapFunction("GetSourceLine",
                                                    Utils::OpenHandle(this),
                                                    &has_pending_exception);
-  EXCEPTION_BAILOUT_CHECK(Local<v8::String>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::String>());
   if (result->IsString()) {
     return scope.Close(Utils::ToLocal(i::Handle<i::String>::cast(result)));
   } else {
     return Local<String>();
   }
 }
 
 
 void Message::PrintCurrentStackTrace(FILE* out) {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::Message::PrintCurrentStackTrace()")) return;
-  ENTER_V8;
+  ENTER_V8(isolate);
   isolate->PrintCurrentStackTrace(out);
 }
 
 
 // --- S t a c k T r a c e ---
 
 Local<StackFrame> StackTrace::GetFrame(uint32_t index) const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::StackTrace::GetFrame()")) {
     return Local<StackFrame>();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   HandleScope scope;
   i::Handle<i::JSArray> self = Utils::OpenHandle(this);
   i::Object* raw_object = self->GetElementNoExceptionThrown(index);
   i::Handle<i::JSObject> obj(i::JSObject::cast(raw_object));
   return scope.Close(Utils::StackFrameToLocal(obj));
 }
 
 
 int StackTrace::GetFrameCount() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::StackTrace::GetFrameCount()")) return -1;
-  ENTER_V8;
+  ENTER_V8(isolate);
   return i::Smi::cast(Utils::OpenHandle(this)->length())->value();
 }
 
 
 Local<Array> StackTrace::AsArray() {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::StackTrace::AsArray()")) Local<Array>();
-  ENTER_V8;
+  ENTER_V8(isolate);
   return Utils::ToLocal(Utils::OpenHandle(this));
 }
 
 
 Local<StackTrace> StackTrace::CurrentStackTrace(int frame_limit,
     StackTraceOptions options) {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::StackTrace::CurrentStackTrace()")) {
     Local<StackTrace>();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::JSArray> stackTrace =
       isolate->CaptureCurrentStackTrace(frame_limit, options);
   return Utils::StackTraceToLocal(stackTrace);
 }
 
 
 // --- S t a c k F r a m e ---
 
 int StackFrame::GetLineNumber() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::StackFrame::GetLineNumber()")) {
     return Message::kNoLineNumberInfo;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> line = GetProperty(self, "lineNumber");
   if (!line->IsSmi()) {
     return Message::kNoLineNumberInfo;
   }
   return i::Smi::cast(*line)->value();
 }
 
 
 int StackFrame::GetColumn() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::StackFrame::GetColumn()")) {
     return Message::kNoColumnInfo;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> column = GetProperty(self, "column");
   if (!column->IsSmi()) {
     return Message::kNoColumnInfo;
   }
   return i::Smi::cast(*column)->value();
 }
 
 
 Local<String> StackFrame::GetScriptName() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::StackFrame::GetScriptName()")) {
     return Local<String>();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   HandleScope scope;
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> name = GetProperty(self, "scriptName");
   if (!name->IsString()) {
     return Local<String>();
   }
   return scope.Close(Local<String>::Cast(Utils::ToLocal(name)));
 }
 
 
 Local<String> StackFrame::GetScriptNameOrSourceURL() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::StackFrame::GetScriptNameOrSourceURL()")) {
     return Local<String>();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   HandleScope scope;
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> name = GetProperty(self, "scriptNameOrSourceURL");
   if (!name->IsString()) {
     return Local<String>();
   }
   return scope.Close(Local<String>::Cast(Utils::ToLocal(name)));
 }
 
 
 Local<String> StackFrame::GetFunctionName() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::StackFrame::GetFunctionName()")) {
     return Local<String>();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   HandleScope scope;
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> name = GetProperty(self, "functionName");
   if (!name->IsString()) {
     return Local<String>();
   }
   return scope.Close(Local<String>::Cast(Utils::ToLocal(name)));
 }
 
 
 bool StackFrame::IsEval() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::StackFrame::IsEval()")) return false;
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> is_eval = GetProperty(self, "isEval");
   return is_eval->IsTrue();
 }
 
 
 bool StackFrame::IsConstructor() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::StackFrame::IsConstructor()")) return false;
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> is_constructor = GetProperty(self, "isConstructor");
   return is_constructor->IsTrue();
 }
 
 
 // --- D a t a ---
 
 bool Value::IsUndefined() const {
@@ skipping 104 matching lines @@
 
 
 bool Value::IsRegExp() const {
   if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsRegExp()")) return false;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   return obj->IsJSRegExp();
 }
 
 
 Local<String> Value::ToString() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::ToString()")) {
-    return Local<String>();
-  }
-  LOG_API(isolate, "ToString");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> str;
   if (obj->IsString()) {
     str = obj;
   } else {
-    ENTER_V8;
-    EXCEPTION_PREAMBLE();
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::ToString()")) {
+      return Local<String>();
+    }
+    LOG_API(isolate, "ToString");
+    ENTER_V8(isolate);
+    EXCEPTION_PREAMBLE(isolate);
     str = i::Execution::ToString(obj, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(Local<String>());
+    EXCEPTION_BAILOUT_CHECK(isolate, Local<String>());
   }
   return Local<String>(ToApi<String>(str));
 }
 
 
 Local<String> Value::ToDetailString() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::ToDetailString()")) {
-    return Local<String>();
-  }
-  LOG_API(isolate, "ToDetailString");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> str;
   if (obj->IsString()) {
     str = obj;
   } else {
-    ENTER_V8;
-    EXCEPTION_PREAMBLE();
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::ToDetailString()")) {
+      return Local<String>();
+    }
+    LOG_API(isolate, "ToDetailString");
+    ENTER_V8(isolate);
+    EXCEPTION_PREAMBLE(isolate);
     str = i::Execution::ToDetailString(obj, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(Local<String>());
+    EXCEPTION_BAILOUT_CHECK(isolate, Local<String>());
   }
   return Local<String>(ToApi<String>(str));
 }
 
 
 Local<v8::Object> Value::ToObject() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::ToObject()")) return Local<v8::Object>();
-  LOG_API(isolate, "ToObject");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> val;
   if (obj->IsJSObject()) {
     val = obj;
   } else {
-    ENTER_V8;
-    EXCEPTION_PREAMBLE();
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::ToObject()")) {
+      return Local<v8::Object>();
+    }
+    LOG_API(isolate, "ToObject");
+    ENTER_V8(isolate);
+    EXCEPTION_PREAMBLE(isolate);
     val = i::Execution::ToObject(obj, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(Local<v8::Object>());
+    EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Object>());
   }
   return Local<v8::Object>(ToApi<Object>(val));
 }
 
 
 Local<Boolean> Value::ToBoolean() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::ToBoolean()")) {
-    return Local<Boolean>();
-  }
-  LOG_API(isolate, "ToBoolean");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsBoolean()) {
     return Local<Boolean>(ToApi<Boolean>(obj));
   } else {
-    ENTER_V8;
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::ToBoolean()")) {
+      return Local<Boolean>();
+    }
+    LOG_API(isolate, "ToBoolean");
+    ENTER_V8(isolate);
     i::Handle<i::Object> val = i::Execution::ToBoolean(obj);
     return Local<Boolean>(ToApi<Boolean>(val));
   }
 }
 
 
 Local<Number> Value::ToNumber() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::ToNumber()")) return Local<Number>();
-  LOG_API(isolate, "ToNumber");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsNumber()) {
     num = obj;
   } else {
-    ENTER_V8;
-    EXCEPTION_PREAMBLE();
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::ToNumber()")) {
+      return Local<Number>();
+    }
+    LOG_API(isolate, "ToNumber");
+    ENTER_V8(isolate);
+    EXCEPTION_PREAMBLE(isolate);
     num = i::Execution::ToNumber(obj, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(Local<Number>());
+    EXCEPTION_BAILOUT_CHECK(isolate, Local<Number>());
   }
   return Local<Number>(ToApi<Number>(num));
 }
 
 
 Local<Integer> Value::ToInteger() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::ToInteger()")) return Local<Integer>();
-  LOG_API(isolate, "ToInteger");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsSmi()) {
     num = obj;
   } else {
-    ENTER_V8;
-    EXCEPTION_PREAMBLE();
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::ToInteger()")) return Local<Integer>();
+    LOG_API(isolate, "ToInteger");
+    ENTER_V8(isolate);
+    EXCEPTION_PREAMBLE(isolate);
     num = i::Execution::ToInteger(obj, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(Local<Integer>());
+    EXCEPTION_BAILOUT_CHECK(isolate, Local<Integer>());
   }
   return Local<Integer>(ToApi<Integer>(num));
 }
 
 
 void External::CheckCast(v8::Value* that) {
   if (IsDeadCheck(i::Isolate::Current(), "v8::External::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsProxy(),
            "v8::External::Cast()",
@@ skipping 67 matching lines @@
 void v8::RegExp::CheckCast(v8::Value* that) {
   if (IsDeadCheck(i::Isolate::Current(), "v8::RegExp::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsJSRegExp(),
            "v8::RegExp::Cast()",
            "Could not convert to regular expression");
 }
 
 
 bool Value::BooleanValue() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::BooleanValue()")) return false;
-  LOG_API(isolate, "BooleanValue");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsBoolean()) {
     return obj->IsTrue();
   } else {
-    ENTER_V8;
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::BooleanValue()")) return false;
+    LOG_API(isolate, "BooleanValue");
+    ENTER_V8(isolate);
     i::Handle<i::Object> value = i::Execution::ToBoolean(obj);
     return value->IsTrue();
   }
 }
 
 
 double Value::NumberValue() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::NumberValue()")) {
-    return i::OS::nan_value();
-  }
-  LOG_API(isolate, "NumberValue");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsNumber()) {
     num = obj;
   } else {
-    ENTER_V8;
-    EXCEPTION_PREAMBLE();
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::NumberValue()")) {
+      return i::OS::nan_value();
+    }
+    LOG_API(isolate, "NumberValue");
+    ENTER_V8(isolate);
+    EXCEPTION_PREAMBLE(isolate);
     num = i::Execution::ToNumber(obj, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(i::OS::nan_value());
+    EXCEPTION_BAILOUT_CHECK(isolate, i::OS::nan_value());
   }
   return num->Number();
 }
 
 
 int64_t Value::IntegerValue() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::IntegerValue()")) return 0;
-  LOG_API(isolate, "IntegerValue");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsNumber()) {
     num = obj;
   } else {
-    ENTER_V8;
-    EXCEPTION_PREAMBLE();
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::IntegerValue()")) return 0;
+    LOG_API(isolate, "IntegerValue");
+    ENTER_V8(isolate);
+    EXCEPTION_PREAMBLE(isolate);
     num = i::Execution::ToInteger(obj, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(0);
+    EXCEPTION_BAILOUT_CHECK(isolate, 0);
   }
   if (num->IsSmi()) {
     return i::Smi::cast(*num)->value();
   } else {
     return static_cast<int64_t>(num->Number());
   }
 }
 
 
 Local<Int32> Value::ToInt32() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::ToInt32()")) return Local<Int32>();
-  LOG_API(isolate, "ToInt32");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsSmi()) {
     num = obj;
   } else {
-    ENTER_V8;
-    EXCEPTION_PREAMBLE();
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::ToInt32()")) return Local<Int32>();
+    LOG_API(isolate, "ToInt32");
+    ENTER_V8(isolate);
+    EXCEPTION_PREAMBLE(isolate);
     num = i::Execution::ToInt32(obj, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(Local<Int32>());
+    EXCEPTION_BAILOUT_CHECK(isolate, Local<Int32>());
   }
   return Local<Int32>(ToApi<Int32>(num));
 }
 
 
 Local<Uint32> Value::ToUint32() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::ToUint32()")) return Local<Uint32>();
-  LOG_API(isolate, "ToUInt32");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsSmi()) {
     num = obj;
   } else {
-    ENTER_V8;
-    EXCEPTION_PREAMBLE();
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::ToUint32()")) return Local<Uint32>();
+    LOG_API(isolate, "ToUInt32");
+    ENTER_V8(isolate);
+    EXCEPTION_PREAMBLE(isolate);
     num = i::Execution::ToUint32(obj, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(Local<Uint32>());
+    EXCEPTION_BAILOUT_CHECK(isolate, Local<Uint32>());
   }
   return Local<Uint32>(ToApi<Uint32>(num));
 }
 
 
 Local<Uint32> Value::ToArrayIndex() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::ToArrayIndex()")) return Local<Uint32>();
-  LOG_API(isolate, "ToArrayIndex");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsSmi()) {
     if (i::Smi::cast(*obj)->value() >= 0) return Utils::Uint32ToLocal(obj);
     return Local<Uint32>();
   }
-  ENTER_V8;
-  EXCEPTION_PREAMBLE();
+  i::Isolate* isolate = i::Isolate::Current();
+  if (IsDeadCheck(isolate, "v8::Value::ToArrayIndex()")) return Local<Uint32>();
+  LOG_API(isolate, "ToArrayIndex");
+  ENTER_V8(isolate);
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> string_obj =
       i::Execution::ToString(obj, &has_pending_exception);
-  EXCEPTION_BAILOUT_CHECK(Local<Uint32>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<Uint32>());
   i::Handle<i::String> str = i::Handle<i::String>::cast(string_obj);
   uint32_t index;
   if (str->AsArrayIndex(&index)) {
     i::Handle<i::Object> value;
     if (index <= static_cast<uint32_t>(i::Smi::kMaxValue)) {
       value = i::Handle<i::Object>(i::Smi::FromInt(index));
     } else {
       value = FACTORY->NewNumber(index);
     }
     return Utils::Uint32ToLocal(value);
   }
   return Local<Uint32>();
 }
 
 
 int32_t Value::Int32Value() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::Int32Value()")) return 0;
-  LOG_API(isolate, "Int32Value");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsSmi()) {
     return i::Smi::cast(*obj)->value();
   } else {
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::Int32Value()")) return 0;
     LOG_API(isolate, "Int32Value (slow)");
-    ENTER_V8;
-    EXCEPTION_PREAMBLE();
+    ENTER_V8(isolate);
+    EXCEPTION_PREAMBLE(isolate);
     i::Handle<i::Object> num =
         i::Execution::ToInt32(obj, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(0);
+    EXCEPTION_BAILOUT_CHECK(isolate, 0);
     if (num->IsSmi()) {
       return i::Smi::cast(*num)->value();
     } else {
       return static_cast<int32_t>(num->Number());
     }
   }
 }
 
 
 bool Value::Equals(Handle<Value> that) const {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::Value::Equals()")
       || EmptyCheck("v8::Value::Equals()", this)
       || EmptyCheck("v8::Value::Equals()", that)) {
     return false;
   }
   LOG_API(isolate, "Equals");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> other = Utils::OpenHandle(*that);
   // If both obj and other are JSObjects, we'd better compare by identity
   // immediately when going into JS builtin.  The reason is Invoke
   // would overwrite global object receiver with global proxy.
   if (obj->IsJSObject() && other->IsJSObject()) {
     return *obj == *other;
   }
   i::Object** args[1] = { other.location() };
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> result =
       CallV8HeapFunction("EQUALS", obj, 1, args, &has_pending_exception);
-  EXCEPTION_BAILOUT_CHECK(false);
+  EXCEPTION_BAILOUT_CHECK(isolate, false);
   return *result == i::Smi::FromInt(i::EQUAL);
 }
 
 
 bool Value::StrictEquals(Handle<Value> that) const {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::Value::StrictEquals()")
       || EmptyCheck("v8::Value::StrictEquals()", this)
       || EmptyCheck("v8::Value::StrictEquals()", that)) {
     return false;
@@ skipping 17 matching lines @@
       i::String::cast(*obj)->Equals(i::String::cast(*other));
   } else if (obj->IsUndefined() || obj->IsUndetectableObject()) {
     return other->IsUndefined() || other->IsUndetectableObject();
   } else {
     return false;
   }
 }
 
 
 uint32_t Value::Uint32Value() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::Uint32Value()")) return 0;
-  LOG_API(isolate, "Uint32Value");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsSmi()) {
     return i::Smi::cast(*obj)->value();
   } else {
-    ENTER_V8;
-    EXCEPTION_PREAMBLE();
+    i::Isolate* isolate = i::Isolate::Current();
+    if (IsDeadCheck(isolate, "v8::Value::Uint32Value()")) return 0;
+    LOG_API(isolate, "Uint32Value");
+    ENTER_V8(isolate);
+    EXCEPTION_PREAMBLE(isolate);
     i::Handle<i::Object> num =
         i::Execution::ToUint32(obj, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(0);
+    EXCEPTION_BAILOUT_CHECK(isolate, 0);
     if (num->IsSmi()) {
       return i::Smi::cast(*num)->value();
     } else {
       return static_cast<uint32_t>(num->Number());
     }
   }
 }
 
 
 bool v8::Object::Set(v8::Handle<Value> key, v8::Handle<Value> value,
                      v8::PropertyAttribute attribs) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::Set()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::Object> self = Utils::OpenHandle(this);
   i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
   i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> obj = i::SetProperty(
       self,
       key_obj,
       value_obj,
       static_cast<PropertyAttributes>(attribs),
       i::kNonStrictMode);
   has_pending_exception = obj.is_null();
-  EXCEPTION_BAILOUT_CHECK(false);
+  EXCEPTION_BAILOUT_CHECK(isolate, false);
   return true;
 }
 
 
 bool v8::Object::Set(uint32_t index, v8::Handle<Value> value) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::Set()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> obj = i::SetElement(
       self,
       index,
       value_obj,
       i::kNonStrictMode);
   has_pending_exception = obj.is_null();
-  EXCEPTION_BAILOUT_CHECK(false);
+  EXCEPTION_BAILOUT_CHECK(isolate, false);
   return true;
 }
 
 
 bool v8::Object::ForceSet(v8::Handle<Value> key,
                           v8::Handle<Value> value,
                           v8::PropertyAttribute attribs) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::ForceSet()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
   i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> obj = i::ForceSetProperty(
       self,
       key_obj,
       value_obj,
       static_cast<PropertyAttributes>(attribs));
   has_pending_exception = obj.is_null();
-  EXCEPTION_BAILOUT_CHECK(false);
+  EXCEPTION_BAILOUT_CHECK(isolate, false);
   return true;
 }
 
 
 bool v8::Object::ForceDelete(v8::Handle<Value> key) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::ForceDelete()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
 
   // When turning on access checks for a global object deoptimize all functions
   // as optimized code does not always handle access checks.
   i::Deoptimizer::DeoptimizeGlobalObject(*self);
 
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> obj = i::ForceDeleteProperty(self, key_obj);
   has_pending_exception = obj.is_null();
-  EXCEPTION_BAILOUT_CHECK(false);
+  EXCEPTION_BAILOUT_CHECK(isolate, false);
   return obj->IsTrue();
 }
 
 
 Local<Value> v8::Object::Get(v8::Handle<Value> key) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::Get()", return Local<v8::Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Object> self = Utils::OpenHandle(this);
   i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> result = i::GetProperty(self, key_obj);
   has_pending_exception = result.is_null();
-  EXCEPTION_BAILOUT_CHECK(Local<Value>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
   return Utils::ToLocal(result);
 }
 
 
 Local<Value> v8::Object::Get(uint32_t index) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::Get()", return Local<v8::Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> result = i::GetElement(self, index);
   has_pending_exception = result.is_null();
-  EXCEPTION_BAILOUT_CHECK(Local<Value>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
   return Utils::ToLocal(result);
 }
 
 
 Local<Value> v8::Object::GetPrototype() {
-  ON_BAILOUT(i::Isolate::Current(), "v8::Object::GetPrototype()",
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::GetPrototype()",
              return Local<v8::Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Object> self = Utils::OpenHandle(this);
   i::Handle<i::Object> result = i::GetPrototype(self);
   return Utils::ToLocal(result);
 }
 
 
 bool v8::Object::SetPrototype(Handle<Value> value) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::SetPrototype()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> result = i::SetPrototype(self, value_obj);
   has_pending_exception = result.is_null();
-  EXCEPTION_BAILOUT_CHECK(false);
+  EXCEPTION_BAILOUT_CHECK(isolate, false);
   return true;
 }
 
 
 Local<Object> v8::Object::FindInstanceInPrototypeChain(
     v8::Handle<FunctionTemplate> tmpl) {
-  ON_BAILOUT(i::Isolate::Current(),
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate,
              "v8::Object::FindInstanceInPrototypeChain()",
              return Local<v8::Object>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::JSObject* object = *Utils::OpenHandle(this);
   i::FunctionTemplateInfo* tmpl_info = *Utils::OpenHandle(*tmpl);
   while (!object->IsInstanceOf(tmpl_info)) {
     i::Object* prototype = object->GetPrototype();
     if (!prototype->IsJSObject()) return Local<Object>();
     object = i::JSObject::cast(prototype);
   }
   return Utils::ToLocal(i::Handle<i::JSObject>(object));
 }
 
 
 Local<Array> v8::Object::GetPropertyNames() {
-  ON_BAILOUT(i::Isolate::Current(), "v8::Object::GetPropertyNames()",
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::GetPropertyNames()",
              return Local<v8::Array>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   v8::HandleScope scope;
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::FixedArray> value =
       i::GetKeysInFixedArrayFor(self, i::INCLUDE_PROTOS);
   // Because we use caching to speed up enumeration it is important
   // to never change the result of the basic enumeration function so
   // we clone the result.
   i::Handle<i::FixedArray> elms = FACTORY->CopyFixedArray(value);
   i::Handle<i::JSArray> result = FACTORY->NewJSArrayWithElements(elms);
   return scope.Close(Utils::ToLocal(result));
 }
 
 
 Local<String> v8::Object::ObjectProtoToString() {
-  ON_BAILOUT(i::Isolate::Current(), "v8::Object::ObjectProtoToString()",
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::ObjectProtoToString()",
              return Local<v8::String>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
 
   i::Handle<i::Object> name(self->class_name());
 
   // Native implementation of Object.prototype.toString (v8natives.js):
   //   var c = %ClassOf(this);
   //   if (c === 'Arguments') c  = 'Object';
   //   return "[object " + c + "]";
 
   if (!name->IsString()) {
@@ skipping 30 matching lines @@
 
       // Copy the buffer into a heap-allocated string and return it.
       Local<String> result = v8::String::New(buf.start(), buf_len);
       return result;
     }
   }
 }
 
 
 Local<String> v8::Object::GetConstructorName() {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::GetConstructorName()",
              return Local<v8::String>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::String> name(self->constructor_name());
   return Utils::ToLocal(name);
 }
 
 
 bool v8::Object::Delete(v8::Handle<String> key) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::Delete()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
   return i::DeleteProperty(self, key_obj)->IsTrue();
 }
 
 
 bool v8::Object::Has(v8::Handle<String> key) {
-  ON_BAILOUT(i::Isolate::Current(), "v8::Object::Has()", return false);
-  ENTER_V8;
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::Has()", return false);
+  ENTER_V8(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
   return self->HasProperty(*key_obj);
 }
 
 
 bool v8::Object::Delete(uint32_t index) {
-  ON_BAILOUT(i::Isolate::Current(), "v8::Object::DeleteProperty()",
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::DeleteProperty()",
              return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   HandleScope scope;
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   return i::DeleteElement(self, index)->IsTrue();
 }
 
 
 bool v8::Object::Has(uint32_t index) {
-  ON_BAILOUT(i::Isolate::Current(), "v8::Object::HasProperty()", return false);
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::HasProperty()", return false);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   return self->HasElement(index);
 }
 
 
 bool Object::SetAccessor(Handle<String> name,
                          AccessorGetter getter,
                          AccessorSetter setter,
                          v8::Handle<Value> data,
                          AccessControl settings,
                          PropertyAttribute attributes) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::SetAccessor()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::AccessorInfo> info = MakeAccessorInfo(name,
                                                      getter, setter, data,
                                                      settings, attributes);
   i::Handle<i::Object> result = i::SetAccessor(Utils::OpenHandle(this), info);
   return !result.is_null() && !result->IsUndefined();
 }
 
 
 bool v8::Object::HasRealNamedProperty(Handle<String> key) {
-  ON_BAILOUT(i::Isolate::Current(), "v8::Object::HasRealNamedProperty()",
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::HasRealNamedProperty()",
              return false);
   return Utils::OpenHandle(this)->HasRealNamedProperty(
       *Utils::OpenHandle(*key));
 }
 
 
 bool v8::Object::HasRealIndexedProperty(uint32_t index) {
-  ON_BAILOUT(i::Isolate::Current(), "v8::Object::HasRealIndexedProperty()",
+  ON_BAILOUT(Utils::OpenHandle(this)->GetIsolate(),
+             "v8::Object::HasRealIndexedProperty()",
              return false);
   return Utils::OpenHandle(this)->HasRealElementProperty(index);
 }
 
 
 bool v8::Object::HasRealNamedCallbackProperty(Handle<String> key) {
-  ON_BAILOUT(i::Isolate::Current(),
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate,
              "v8::Object::HasRealNamedCallbackProperty()",
              return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   return Utils::OpenHandle(this)->HasRealNamedCallbackProperty(
       *Utils::OpenHandle(*key));
 }
 
 
 bool v8::Object::HasNamedLookupInterceptor() {
-  ON_BAILOUT(i::Isolate::Current(), "v8::Object::HasNamedLookupInterceptor()",
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::HasNamedLookupInterceptor()",
              return false);
   return Utils::OpenHandle(this)->HasNamedInterceptor();
 }
 
 
 bool v8::Object::HasIndexedLookupInterceptor() {
-  ON_BAILOUT(i::Isolate::Current(), "v8::Object::HasIndexedLookupInterceptor()",
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::HasIndexedLookupInterceptor()",
              return false);
   return Utils::OpenHandle(this)->HasIndexedInterceptor();
 }
 
 
 Local<Value> v8::Object::GetRealNamedPropertyInPrototypeChain(
       Handle<String> key) {
-  ON_BAILOUT(i::Isolate::Current(),
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate,
              "v8::Object::GetRealNamedPropertyInPrototypeChain()",
              return Local<Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::JSObject> self_obj = Utils::OpenHandle(this);
   i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
   i::LookupResult lookup;
   self_obj->LookupRealNamedPropertyInPrototypes(*key_obj, &lookup);
   if (lookup.IsProperty()) {
     PropertyAttributes attributes;
     i::Object* property =
         self_obj->GetProperty(*self_obj,
                               &lookup,
                               *key_obj,
                               &attributes)->ToObjectUnchecked();
     i::Handle<i::Object> result(property);
     return Utils::ToLocal(result);
   }
   return Local<Value>();  // No real property was found in prototype chain.
 }
 
 
 Local<Value> v8::Object::GetRealNamedProperty(Handle<String> key) {
-  ON_BAILOUT(i::Isolate::Current(), "v8::Object::GetRealNamedProperty()",
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::GetRealNamedProperty()",
              return Local<Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::JSObject> self_obj = Utils::OpenHandle(this);
   i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
   i::LookupResult lookup;
   self_obj->LookupRealNamedProperty(*key_obj, &lookup);
   if (lookup.IsProperty()) {
     PropertyAttributes attributes;
     i::Object* property =
         self_obj->GetProperty(*self_obj,
                               &lookup,
                               *key_obj,
                               &attributes)->ToObjectUnchecked();
     i::Handle<i::Object> result(property);
     return Utils::ToLocal(result);
   }
   return Local<Value>();  // No real property was found in prototype chain.
 }
 
 
 // Turns on access checks by copying the map and setting the check flag.
 // Because the object gets a new map, existing inline cache caching
 // the old map of this object will fail.
 void v8::Object::TurnOnAccessCheck() {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::TurnOnAccessCheck()", return);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
 
   // When turning on access checks for a global object deoptimize all functions
   // as optimized code does not always handle access checks.
   i::Deoptimizer::DeoptimizeGlobalObject(*obj);
 
   i::Handle<i::Map> new_map =
-    FACTORY->CopyMapDropTransitions(i::Handle<i::Map>(obj->map()));
+    isolate->factory()->CopyMapDropTransitions(i::Handle<i::Map>(obj->map()));
   new_map->set_is_access_check_needed(true);
   obj->set_map(*new_map);
 }
 
 
 bool v8::Object::IsDirty() {
   return Utils::OpenHandle(this)->IsDirty();
 }
 
 
 Local<v8::Object> v8::Object::Clone() {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::Clone()", return Local<Object>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::JSObject> result = i::Copy(self);
   has_pending_exception = result.is_null();
-  EXCEPTION_BAILOUT_CHECK(Local<Object>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<Object>());
   return Utils::ToLocal(result);
 }
 
 
 int v8::Object::GetIdentityHash() {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::GetIdentityHash()", return 0);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> hidden_props_obj(i::GetHiddenProperties(self, true));
   if (!hidden_props_obj->IsJSObject()) {
     // We failed to create hidden properties.  That's a detached
     // global proxy.
     ASSERT(hidden_props_obj->IsUndefined());
     return 0;
   }
   i::Handle<i::JSObject> hidden_props =
@@ skipping 20 matching lines @@
           hash_symbol,
           i::Handle<i::Object>(i::Smi::FromInt(hash_value)),
           static_cast<PropertyAttributes>(None)).is_null());
 
   return hash_value;
 }
 
 
 bool v8::Object::SetHiddenValue(v8::Handle<v8::String> key,
                                 v8::Handle<v8::Value> value) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::SetHiddenValue()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> hidden_props(i::GetHiddenProperties(self, true));
   i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
   i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> obj = i::SetProperty(
       hidden_props,
       key_obj,
       value_obj,
       static_cast<PropertyAttributes>(None),
       i::kNonStrictMode);
   has_pending_exception = obj.is_null();
-  EXCEPTION_BAILOUT_CHECK(false);
+  EXCEPTION_BAILOUT_CHECK(isolate, false);
   return true;
 }
 
 
 v8::Local<v8::Value> v8::Object::GetHiddenValue(v8::Handle<v8::String> key) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::GetHiddenValue()",
              return Local<v8::Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> hidden_props(i::GetHiddenProperties(self, false));
   if (hidden_props->IsUndefined()) {
     return v8::Local<v8::Value>();
   }
   i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> result = i::GetProperty(hidden_props, key_obj);
   has_pending_exception = result.is_null();
-  EXCEPTION_BAILOUT_CHECK(v8::Local<v8::Value>());
+  EXCEPTION_BAILOUT_CHECK(isolate, v8::Local<v8::Value>());
   if (result->IsUndefined()) {
     return v8::Local<v8::Value>();
   }
   return Utils::ToLocal(result);
 }
 
 
 bool v8::Object::DeleteHiddenValue(v8::Handle<v8::String> key) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::DeleteHiddenValue()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> hidden_props(i::GetHiddenProperties(self, false));
   if (hidden_props->IsUndefined()) {
     return true;
   }
   i::Handle<i::JSObject> js_obj(i::JSObject::cast(*hidden_props));
   i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
   return i::DeleteProperty(js_obj, key_obj)->IsTrue();
 }
 
 
 namespace {
 
 void PrepareExternalArrayElements(i::Handle<i::JSObject> object,
                                   void* data,
                                   ExternalArrayType array_type,
                                   int length) {
+  i::Isolate* isolate = object->GetIsolate();
   i::Handle<i::ExternalArray> array =
-      FACTORY->NewExternalArray(length, array_type, data);
+      isolate->factory()->NewExternalArray(length, array_type, data);
 
   // If the object already has external elements, create a new, unique
   // map if the element type is now changing, because assumptions about
   // generated code based on the receiver's map will be invalid.
   i::Handle<i::HeapObject> elements(object->elements());
   bool force_unique_map =
       elements->map()->IsUndefined() ||
       !elements->map()->has_external_array_elements() ||
       elements->map() != HEAP->MapForExternalArrayType(array_type);
   if (force_unique_map) {
     i::Handle<i::Map> external_array_map =
-        FACTORY->NewExternalArrayElementsMap(
+        isolate->factory()->NewExternalArrayElementsMap(
             i::Handle<i::Map>(object->map()));
     object->set_map(*external_array_map);
   }
   object->set_elements(*array);
 }
 
 }  // namespace
 
 
 void v8::Object::SetIndexedPropertiesToPixelData(uint8_t* data, int length) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::SetElementsToPixelData()", return);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   if (!ApiCheck(length <= i::ExternalPixelArray::kMaxLength,
                 "v8::Object::SetIndexedPropertiesToPixelData()",
                 "length exceeds max acceptable value")) {
     return;
   }
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   if (!ApiCheck(!self->IsJSArray(),
                 "v8::Object::SetIndexedPropertiesToPixelData()",
                 "JSArray is not supported")) {
     return;
   }
   PrepareExternalArrayElements(self, data, kExternalPixelArray, length);
 }
 
 
 bool v8::Object::HasIndexedPropertiesInPixelData() {
-  ON_BAILOUT(i::Isolate::Current(), "v8::HasIndexedPropertiesInPixelData()",
+  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
+  ON_BAILOUT(self->GetIsolate(), "v8::HasIndexedPropertiesInPixelData()",
              return false);
-  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   return self->HasExternalPixelElements();
 }
 
 
 uint8_t* v8::Object::GetIndexedPropertiesPixelData() {
-  ON_BAILOUT(i::Isolate::Current(), "v8::GetIndexedPropertiesPixelData()",
+  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
+  ON_BAILOUT(self->GetIsolate(), "v8::GetIndexedPropertiesPixelData()",
              return NULL);
-  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   if (self->HasExternalPixelElements()) {
     return i::ExternalPixelArray::cast(self->elements())->
         external_pixel_pointer();
   } else {
     return NULL;
   }
 }
 
 
 int v8::Object::GetIndexedPropertiesPixelDataLength() {
-  ON_BAILOUT(i::Isolate::Current(), "v8::GetIndexedPropertiesPixelDataLength()",
+  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
+  ON_BAILOUT(self->GetIsolate(), "v8::GetIndexedPropertiesPixelDataLength()",
              return -1);
-  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   if (self->HasExternalPixelElements()) {
     return i::ExternalPixelArray::cast(self->elements())->length();
   } else {
     return -1;
   }
 }
 
 void v8::Object::SetIndexedPropertiesToExternalArrayData(
     void* data,
     ExternalArrayType array_type,
     int length) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::SetIndexedPropertiesToExternalArrayData()", return);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   if (!ApiCheck(length <= i::ExternalArray::kMaxLength,
                 "v8::Object::SetIndexedPropertiesToExternalArrayData()",
                 "length exceeds max acceptable value")) {
     return;
   }
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   if (!ApiCheck(!self->IsJSArray(),
                 "v8::Object::SetIndexedPropertiesToExternalArrayData()",
                 "JSArray is not supported")) {
     return;
   }
   PrepareExternalArrayElements(self, data, array_type, length);
 }
 
 
 bool v8::Object::HasIndexedPropertiesInExternalArrayData() {
-  ON_BAILOUT(i::Isolate::Current(),
+  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
+  ON_BAILOUT(self->GetIsolate(),
              "v8::HasIndexedPropertiesInExternalArrayData()",
              return false);
-  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   return self->HasExternalArrayElements();
 }
 
 
 void* v8::Object::GetIndexedPropertiesExternalArrayData() {
-  ON_BAILOUT(i::Isolate::Current(),
+  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
+  ON_BAILOUT(self->GetIsolate(),
              "v8::GetIndexedPropertiesExternalArrayData()",
              return NULL);
-  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   if (self->HasExternalArrayElements()) {
     return i::ExternalArray::cast(self->elements())->external_pointer();
   } else {
     return NULL;
   }
 }
 
 
 ExternalArrayType v8::Object::GetIndexedPropertiesExternalArrayDataType() {
-  ON_BAILOUT(i::Isolate::Current(),
+  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
+  ON_BAILOUT(self->GetIsolate(),
              "v8::GetIndexedPropertiesExternalArrayDataType()",
              return static_cast<ExternalArrayType>(-1));
-  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   switch (self->elements()->map()->instance_type()) {
     case i::EXTERNAL_BYTE_ARRAY_TYPE:
       return kExternalByteArray;
     case i::EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE:
       return kExternalUnsignedByteArray;
     case i::EXTERNAL_SHORT_ARRAY_TYPE:
       return kExternalShortArray;
     case i::EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE:
       return kExternalUnsignedShortArray;
     case i::EXTERNAL_INT_ARRAY_TYPE:
       return kExternalIntArray;
     case i::EXTERNAL_UNSIGNED_INT_ARRAY_TYPE:
       return kExternalUnsignedIntArray;
     case i::EXTERNAL_FLOAT_ARRAY_TYPE:
       return kExternalFloatArray;
     case i::EXTERNAL_PIXEL_ARRAY_TYPE:
       return kExternalPixelArray;
     default:
       return static_cast<ExternalArrayType>(-1);
   }
 }
 
 
 int v8::Object::GetIndexedPropertiesExternalArrayDataLength() {
-  ON_BAILOUT(i::Isolate::Current(),
+  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
+  ON_BAILOUT(self->GetIsolate(),
              "v8::GetIndexedPropertiesExternalArrayDataLength()",
              return 0);
-  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   if (self->HasExternalArrayElements()) {
     return i::ExternalArray::cast(self->elements())->length();
   } else {
     return -1;
   }
 }
 
 
 Local<v8::Object> Function::NewInstance() const {
   return NewInstance(0, NULL);
 }
 
 
 Local<v8::Object> Function::NewInstance(int argc,
                                         v8::Handle<v8::Value> argv[]) const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Function::NewInstance()",
              return Local<v8::Object>());
   LOG_API(isolate, "Function::NewInstance");
-  ENTER_V8;
+  ENTER_V8(isolate);
   HandleScope scope;
   i::Handle<i::JSFunction> function = Utils::OpenHandle(this);
   STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
   i::Object*** args = reinterpret_cast<i::Object***>(argv);
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> returned =
       i::Execution::New(function, argc, args, &has_pending_exception);
-  EXCEPTION_BAILOUT_CHECK(Local<v8::Object>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Object>());
   return scope.Close(Utils::ToLocal(i::Handle<i::JSObject>::cast(returned)));
 }
 
 
 Local<v8::Value> Function::Call(v8::Handle<v8::Object> recv, int argc,
                                 v8::Handle<v8::Value> argv[]) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Function::Call()", return Local<v8::Value>());
   LOG_API(isolate, "Function::Call");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Object* raw_result = NULL;
   {
     i::HandleScope scope(isolate);
     i::Handle<i::JSFunction> fun = Utils::OpenHandle(this);
     i::Handle<i::Object> recv_obj = Utils::OpenHandle(*recv);
     STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
     i::Object*** args = reinterpret_cast<i::Object***>(argv);
-    EXCEPTION_PREAMBLE();
+    EXCEPTION_PREAMBLE(isolate);
     i::Handle<i::Object> returned =
         i::Execution::Call(fun, recv_obj, argc, args, &has_pending_exception);
-    EXCEPTION_BAILOUT_CHECK(Local<Object>());
+    EXCEPTION_BAILOUT_CHECK(isolate, Local<Object>());
     raw_result = *returned;
   }
   i::Handle<i::Object> result(raw_result);
   return Utils::ToLocal(result);
 }
 
 
 void Function::SetName(v8::Handle<v8::String> name) {
-  ENTER_V8;
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ENTER_V8(isolate);
   i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
   func->shared()->set_name(*Utils::OpenHandle(*name));
 }
 
 
 Handle<Value> Function::GetName() const {
   i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
   return Utils::ToLocal(i::Handle<i::Object>(func->shared()->name()));
 }
 
@@ skipping 34 matching lines @@
 int String::Utf8Length() const {
   if (IsDeadCheck(i::Isolate::Current(), "v8::String::Utf8Length()")) return 0;
   return Utils::OpenHandle(this)->Utf8Length();
 }
 
 
 int String::WriteUtf8(char* buffer,
                       int capacity,
                       int* nchars_ref,
                       WriteHints hints) const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::String::WriteUtf8()")) return 0;
   LOG_API(isolate, "String::WriteUtf8");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::StringInputBuffer& write_input_buffer = *isolate->write_input_buffer();
   i::Handle<i::String> str = Utils::OpenHandle(this);
   isolate->string_tracker()->RecordWrite(str);
   if (hints & HINT_MANY_WRITES_EXPECTED) {
     // Flatten the string for efficiency.  This applies whether we are
     // using StringInputBuffer or Get(i) to access the characters.
     str->TryFlatten();
   }
   write_input_buffer.Reset(0, *str);
   int len = str->length();
@@ skipping 33 matching lines @@
   if (i == len && (capacity == -1 || pos < capacity))
     buffer[pos++] = '\0';
   return pos;
 }
 
 
 int String::WriteAscii(char* buffer,
                        int start,
                        int length,
                        WriteHints hints) const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::String::WriteAscii()")) return 0;
   LOG_API(isolate, "String::WriteAscii");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::StringInputBuffer& write_input_buffer = *isolate->write_input_buffer();
   ASSERT(start >= 0 && length >= -1);
   i::Handle<i::String> str = Utils::OpenHandle(this);
   isolate->string_tracker()->RecordWrite(str);
   if (hints & HINT_MANY_WRITES_EXPECTED) {
     // Flatten the string for efficiency.  This applies whether we are
     // using StringInputBuffer or Get(i) to access the characters.
     str->TryFlatten();
   }
   int end = length;
@@ skipping 10 matching lines @@
   if (length == -1 || i < length)
     buffer[i] = '\0';
   return i;
 }
 
 
 int String::Write(uint16_t* buffer,
                   int start,
                   int length,
                   WriteHints hints) const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::String::Write()")) return 0;
   LOG_API(isolate, "String::Write");
-  ENTER_V8;
+  ENTER_V8(isolate);
   ASSERT(start >= 0 && length >= -1);
   i::Handle<i::String> str = Utils::OpenHandle(this);
   isolate->string_tracker()->RecordWrite(str);
   if (hints & HINT_MANY_WRITES_EXPECTED) {
     // Flatten the string for efficiency.  This applies whether we are
     // using StringInputBuffer or Get(i) to access the characters.
     str->TryFlatten();
   }
   int end = start + length;
   if ((length == -1) || (length > str->length() - start) )
     end = str->length();
   if (end < 0) return 0;
   i::String::WriteToFlat(*str, buffer, start, end);
   if (length == -1 || end - start < length) {
     buffer[end - start] = '\0';
   }
   return end - start;
 }
 
 
 bool v8::String::IsExternal() const {
-  EnsureInitialized("v8::String::IsExternal()");
   i::Handle<i::String> str = Utils::OpenHandle(this);
+  if (IsDeadCheck(str->GetIsolate(), "v8::String::IsExternal()")) {
+    return false;
+  }
+  EnsureInitializedForIsolate(str->GetIsolate(), "v8::String::IsExternal()");
   return i::StringShape(*str).IsExternalTwoByte();
 }
 
 
 bool v8::String::IsExternalAscii() const {
-  EnsureInitialized("v8::String::IsExternalAscii()");
   i::Handle<i::String> str = Utils::OpenHandle(this);
+  if (IsDeadCheck(str->GetIsolate(), "v8::String::IsExternalAscii()")) {
+    return false;
+  }
   return i::StringShape(*str).IsExternalAscii();
 }
 
 
 void v8::String::VerifyExternalStringResource(
     v8::String::ExternalStringResource* value) const {
   i::Handle<i::String> str = Utils::OpenHandle(this);
   v8::String::ExternalStringResource* expected;
   if (i::StringShape(*str).IsExternalTwoByte()) {
     void* resource = i::Handle<i::ExternalTwoByteString>::cast(str)->resource();
     expected = reinterpret_cast<ExternalStringResource*>(resource);
   } else {
     expected = NULL;
   }
   CHECK_EQ(expected, value);
 }
 
 
 v8::String::ExternalAsciiStringResource*
       v8::String::GetExternalAsciiStringResource() const {
-  EnsureInitialized("v8::String::GetExternalAsciiStringResource()");
   i::Handle<i::String> str = Utils::OpenHandle(this);
+  if (IsDeadCheck(str->GetIsolate(),
+                  "v8::String::GetExternalAsciiStringResource()")) {
+    return NULL;
+  }
   if (i::StringShape(*str).IsExternalAscii()) {
     void* resource = i::Handle<i::ExternalAsciiString>::cast(str)->resource();
     return reinterpret_cast<ExternalAsciiStringResource*>(resource);
   } else {
     return NULL;
   }
 }
 
 
 double Number::Value() const {
@@ skipping 37 matching lines @@
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsSmi()) {
     return i::Smi::cast(*obj)->value();
   } else {
     return static_cast<uint32_t>(obj->Number());
   }
 }
 
 
 int v8::Object::InternalFieldCount() {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Object::InternalFieldCount()")) {
+  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
+  if (IsDeadCheck(obj->GetIsolate(), "v8::Object::InternalFieldCount()")) {
     return 0;
   }
-  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
   return obj->GetInternalFieldCount();
 }
 
 
 Local<Value> v8::Object::CheckedGetInternalField(int index) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Object::GetInternalField()")) {
+  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
+  if (IsDeadCheck(obj->GetIsolate(), "v8::Object::GetInternalField()")) {
     return Local<Value>();
   }
-  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
   if (!ApiCheck(index < obj->GetInternalFieldCount(),
                 "v8::Object::GetInternalField()",
                 "Reading internal field out of bounds")) {
     return Local<Value>();
   }
   i::Handle<i::Object> value(obj->GetInternalField(index));
   Local<Value> result = Utils::ToLocal(value);
 #ifdef DEBUG
   Local<Value> unchecked = UncheckedGetInternalField(index);
   ASSERT(unchecked.IsEmpty() || (unchecked == result));
 #endif
   return result;
 }
 
 
 void v8::Object::SetInternalField(int index, v8::Handle<Value> value) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Object::SetInternalField()")) {
+  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
+  i::Isolate* isolate = obj->GetIsolate();
+  if (IsDeadCheck(isolate, "v8::Object::SetInternalField()")) {
     return;
   }
-  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
   if (!ApiCheck(index < obj->GetInternalFieldCount(),
                 "v8::Object::SetInternalField()",
                 "Writing internal field out of bounds")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Object> val = Utils::OpenHandle(*value);
   obj->SetInternalField(index, *val);
 }
 
 
 static bool CanBeEncodedAsSmi(void* ptr) {
   const uintptr_t address = reinterpret_cast<uintptr_t>(ptr);
   return ((address & i::kEncodablePointerMask) == 0);
 }
 
 
 static i::Smi* EncodeAsSmi(void* ptr) {
   ASSERT(CanBeEncodedAsSmi(ptr));
   const uintptr_t address = reinterpret_cast<uintptr_t>(ptr);
   i::Smi* result = reinterpret_cast<i::Smi*>(address << i::kPointerToSmiShift);
   ASSERT(i::Internals::HasSmiTag(result));
   ASSERT_EQ(result, i::Smi::FromInt(result->value()));
   ASSERT_EQ(ptr, i::Internals::GetExternalPointerFromSmi(result));
   return result;
 }
 
 
 void v8::Object::SetPointerInInternalField(int index, void* value) {
-  ENTER_V8;
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ENTER_V8(isolate);
   if (CanBeEncodedAsSmi(value)) {
     Utils::OpenHandle(this)->SetInternalField(index, EncodeAsSmi(value));
   } else {
     HandleScope scope;
     i::Handle<i::Proxy> proxy =
-        FACTORY->NewProxy(reinterpret_cast<i::Address>(value), i::TENURED);
+        isolate->factory()->NewProxy(
+            reinterpret_cast<i::Address>(value), i::TENURED);
     if (!proxy.is_null())
         Utils::OpenHandle(this)->SetInternalField(index, *proxy);
   }
   ASSERT_EQ(value, GetPointerFromInternalField(index));
 }
 
 
 // --- E n v i r o n m e n t ---
 
 
@@ skipping 75 matching lines @@
     v8::Handle<ObjectTemplate> global_template,
     v8::Handle<Value> global_object) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Context::New()");
   LOG_API(isolate, "Context::New");
   ON_BAILOUT(isolate, "v8::Context::New()", return Persistent<Context>());
 
   // Enter V8 via an ENTER_V8 scope.
   i::Handle<i::Context> env;
   {
-    ENTER_V8;
+    ENTER_V8(isolate);
     v8::Handle<ObjectTemplate> proxy_template = global_template;
     i::Handle<i::FunctionTemplateInfo> proxy_constructor;
     i::Handle<i::FunctionTemplateInfo> global_constructor;
 
     if (!global_template.IsEmpty()) {
       // Make sure that the global_template has a constructor.
       global_constructor =
           EnsureConstructor(Utils::OpenHandle(*global_template));
 
       // Create a fresh template for the global proxy object.
@@ skipping 38 matching lines @@
   }
   // Leave V8.
 
   if (env.is_null())
     return Persistent<Context>();
   return Persistent<Context>(Utils::ToLocal(env));
 }
 
 
 void v8::Context::SetSecurityToken(Handle<Value> token) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Context::SetSecurityToken()")) {
+  i::Isolate* isolate = i::Isolate::Current();
+  if (IsDeadCheck(isolate, "v8::Context::SetSecurityToken()")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Context> env = Utils::OpenHandle(this);
   i::Handle<i::Object> token_handle = Utils::OpenHandle(*token);
   env->set_security_token(*token_handle);
 }
 
 
 void v8::Context::UseDefaultSecurityToken() {
-  if (IsDeadCheck(i::Isolate::Current(),
+  i::Isolate* isolate = i::Isolate::Current();
+  if (IsDeadCheck(isolate,
                   "v8::Context::UseDefaultSecurityToken()")) {
     return;
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Context> env = Utils::OpenHandle(this);
   env->set_security_token(env->global());
 }
 
 
 Handle<Value> v8::Context::GetSecurityToken() {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Context::GetSecurityToken()")) {
+  i::Isolate* isolate = i::Isolate::Current();
+  if (IsDeadCheck(isolate, "v8::Context::GetSecurityToken()")) {
     return Handle<Value>();
   }
   i::Handle<i::Context> env = Utils::OpenHandle(this);
   i::Object* security_token = env->security_token();
   i::Handle<i::Object> token_handle(security_token);
   return Utils::ToLocal(token_handle);
 }
 
 
 bool Context::HasOutOfMemoryException() {
@@ skipping 48 matching lines @@
   }
   i::Object** ctx = reinterpret_cast<i::Object**>(this);
   i::Handle<i::Context> context =
       i::Handle<i::Context>::cast(i::Handle<i::Object>(ctx));
   i::Handle<i::Object> global(context->global_proxy());
   return Utils::ToLocal(i::Handle<i::JSObject>::cast(global));
 }
 
 
 void Context::DetachGlobal() {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Context::DetachGlobal()")) return;
-  ENTER_V8;
+  i::Isolate* isolate = i::Isolate::Current();
+  if (IsDeadCheck(isolate, "v8::Context::DetachGlobal()")) return;
+  ENTER_V8(isolate);
   i::Object** ctx = reinterpret_cast<i::Object**>(this);
   i::Handle<i::Context> context =
       i::Handle<i::Context>::cast(i::Handle<i::Object>(ctx));
-  i::Isolate::Current()->bootstrapper()->DetachGlobal(context);
+  isolate->bootstrapper()->DetachGlobal(context);
 }
 
 
 void Context::ReattachGlobal(Handle<Object> global_object) {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::Context::ReattachGlobal()")) return;
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Object** ctx = reinterpret_cast<i::Object**>(this);
   i::Handle<i::Context> context =
       i::Handle<i::Context>::cast(i::Handle<i::Object>(ctx));
   isolate->bootstrapper()->ReattachGlobal(
       context,
       Utils::OpenHandle(*global_object));
 }
 
 
 void V8::SetWrapperClassId(i::Object** global_handle, uint16_t class_id) {
   i::GlobalHandles::SetWrapperClassId(global_handle, class_id);
 }
 
 
 Local<v8::Object> ObjectTemplate::NewInstance() {
   i::Isolate* isolate = i::Isolate::Current();
   ON_BAILOUT(isolate, "v8::ObjectTemplate::NewInstance()",
              return Local<v8::Object>());
   LOG_API(isolate, "ObjectTemplate::NewInstance");
-  ENTER_V8;
-  EXCEPTION_PREAMBLE();
+  ENTER_V8(isolate);
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> obj =
       i::Execution::InstantiateObject(Utils::OpenHandle(this),
                                       &has_pending_exception);
-  EXCEPTION_BAILOUT_CHECK(Local<v8::Object>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Object>());
   return Utils::ToLocal(i::Handle<i::JSObject>::cast(obj));
 }
 
 
 Local<v8::Function> FunctionTemplate::GetFunction() {
   i::Isolate* isolate = i::Isolate::Current();
   ON_BAILOUT(isolate, "v8::FunctionTemplate::GetFunction()",
              return Local<v8::Function>());
   LOG_API(isolate, "FunctionTemplate::GetFunction");
-  ENTER_V8;
-  EXCEPTION_PREAMBLE();
+  ENTER_V8(isolate);
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> obj =
       i::Execution::InstantiateFunction(Utils::OpenHandle(this),
                                         &has_pending_exception);
-  EXCEPTION_BAILOUT_CHECK(Local<v8::Function>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Function>());
   return Utils::ToLocal(i::Handle<i::JSFunction>::cast(obj));
 }
 
 
 bool FunctionTemplate::HasInstance(v8::Handle<v8::Value> value) {
   ON_BAILOUT(i::Isolate::Current(), "v8::FunctionTemplate::HasInstanceOf()",
              return false);
   i::Object* obj = *Utils::OpenHandle(*value);
   return obj->IsInstanceOf(*Utils::OpenHandle(this));
 }
 
 
 static Local<External> ExternalNewImpl(void* data) {
   return Utils::ToLocal(FACTORY->NewProxy(static_cast<i::Address>(data)));
 }
 
 static void* ExternalValueImpl(i::Handle<i::Object> obj) {
   return reinterpret_cast<void*>(i::Proxy::cast(*obj)->proxy());
 }
 
 
 Local<Value> v8::External::Wrap(void* data) {
   i::Isolate* isolate = i::Isolate::Current();
   STATIC_ASSERT(sizeof(data) == sizeof(i::Address));
   LOG_API(isolate, "External::Wrap");
   EnsureInitializedForIsolate(isolate, "v8::External::Wrap()");
-  ENTER_V8;
+  ENTER_V8(isolate);
 
   v8::Local<v8::Value> result = CanBeEncodedAsSmi(data)
       ? Utils::ToLocal(i::Handle<i::Object>(EncodeAsSmi(data)))
       : v8::Local<v8::Value>(ExternalNewImpl(data));
 
   ASSERT_EQ(data, Unwrap(result));
   return result;
 }
 
 
@@ skipping 24 matching lines @@
   ASSERT_EQ(result, QuickUnwrap(wrapper));
   return result;
 }
 
 
 Local<External> v8::External::New(void* data) {
   STATIC_ASSERT(sizeof(data) == sizeof(i::Address));
   i::Isolate* isolate = i::Isolate::Current();
   LOG_API(isolate, "External::New");
   EnsureInitializedForIsolate(isolate, "v8::External::New()");
-  ENTER_V8;
+  ENTER_V8(isolate);
   return ExternalNewImpl(data);
 }
 
 
 void* External::Value() const {
   if (IsDeadCheck(i::Isolate::Current(), "v8::External::Value()")) return 0;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   return ExternalValueImpl(obj);
 }
 
 
 Local<String> v8::String::Empty() {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::Empty()");
   LOG_API(isolate, "String::Empty()");
   return Utils::ToLocal(isolate->factory()->empty_symbol());
 }
 
 
 Local<String> v8::String::New(const char* data, int length) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::New()");
   LOG_API(isolate, "String::New(char)");
   if (length == 0) return Empty();
-  ENTER_V8;
+  ENTER_V8(isolate);
   if (length == -1) length = i::StrLength(data);
   i::Handle<i::String> result =
       isolate->factory()->NewStringFromUtf8(
           i::Vector<const char>(data, length));
   return Utils::ToLocal(result);
 }
 
 
 Local<String> v8::String::Concat(Handle<String> left, Handle<String> right) {
   i::Handle<i::String> left_string = Utils::OpenHandle(*left);
   i::Isolate* isolate = left_string->GetIsolate();
-  EnsureInitializedForIsolate(isolate, "v8::String::Concat()");
-  LOG_API(isolate, "String::Concat()");
-  ENTER_V8;
+  EnsureInitializedForIsolate(isolate, "v8::String::New()");
+  LOG_API(isolate, "String::New(char)");
+  ENTER_V8(isolate);
   i::Handle<i::String> right_string = Utils::OpenHandle(*right);
   i::Handle<i::String> result = isolate->factory()->NewConsString(left_string,
                                                                   right_string);
   return Utils::ToLocal(result);
 }
 
 
 Local<String> v8::String::NewUndetectable(const char* data, int length) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::NewUndetectable()");
   LOG_API(isolate, "String::NewUndetectable(char)");
-  ENTER_V8;
+  ENTER_V8(isolate);
   if (length == -1) length = i::StrLength(data);
   i::Handle<i::String> result =
       isolate->factory()->NewStringFromUtf8(
           i::Vector<const char>(data, length));
   result->MarkAsUndetectable();
   return Utils::ToLocal(result);
 }
 
 
 static int TwoByteStringLength(const uint16_t* data) {
   int length = 0;
   while (data[length] != '\0') length++;
   return length;
 }
 
 
 Local<String> v8::String::New(const uint16_t* data, int length) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::New()");
   LOG_API(isolate, "String::New(uint16_)");
   if (length == 0) return Empty();
-  ENTER_V8;
+  ENTER_V8(isolate);
   if (length == -1) length = TwoByteStringLength(data);
   i::Handle<i::String> result =
       isolate->factory()->NewStringFromTwoByte(
           i::Vector<const uint16_t>(data, length));
   return Utils::ToLocal(result);
 }
 
 
 Local<String> v8::String::NewUndetectable(const uint16_t* data, int length) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::NewUndetectable()");
   LOG_API(isolate, "String::NewUndetectable(uint16_)");
-  ENTER_V8;
+  ENTER_V8(isolate);
   if (length == -1) length = TwoByteStringLength(data);
   i::Handle<i::String> result =
       isolate->factory()->NewStringFromTwoByte(
           i::Vector<const uint16_t>(data, length));
   result->MarkAsUndetectable();
   return Utils::ToLocal(result);
 }
 
 
 i::Handle<i::String> NewExternalStringHandle(i::Isolate* isolate,
@@ skipping 10 matching lines @@
       isolate->factory()->NewExternalStringFromAscii(resource);
   return result;
 }
 
 
 Local<String> v8::String::NewExternal(
       v8::String::ExternalStringResource* resource) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::NewExternal()");
   LOG_API(isolate, "String::NewExternal");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::String> result = NewExternalStringHandle(isolate, resource);
   isolate->heap()->external_string_table()->AddString(*result);
   return Utils::ToLocal(result);
 }
 
 
 bool v8::String::MakeExternal(v8::String::ExternalStringResource* resource) {
   i::Handle<i::String> obj = Utils::OpenHandle(this);
   i::Isolate* isolate = obj->GetIsolate();
   if (IsDeadCheck(isolate, "v8::String::MakeExternal()")) return false;
-  if (this->IsExternal()) return false;  // Already an external string.
-  ENTER_V8;
+  if (i::StringShape(*obj).IsExternalTwoByte()) {
+    return false;  // Already an external string.
+  }
+  ENTER_V8(isolate);
   if (isolate->string_tracker()->IsFreshUnusedString(obj)) {
     return false;
   }
   bool result = obj->MakeExternal(resource);
   if (result && !obj->IsSymbol()) {
     isolate->heap()->external_string_table()->AddString(*obj);
   }
   return result;
 }
 
 
 Local<String> v8::String::NewExternal(
       v8::String::ExternalAsciiStringResource* resource) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::NewExternal()");
   LOG_API(isolate, "String::NewExternal");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::String> result = NewExternalAsciiStringHandle(isolate, resource);
   isolate->heap()->external_string_table()->AddString(*result);
   return Utils::ToLocal(result);
 }
 
 
 bool v8::String::MakeExternal(
     v8::String::ExternalAsciiStringResource* resource) {
   i::Handle<i::String> obj = Utils::OpenHandle(this);
   i::Isolate* isolate = obj->GetIsolate();
   if (IsDeadCheck(isolate, "v8::String::MakeExternal()")) return false;
-  if (this->IsExternal()) return false;  // Already an external string.
-  ENTER_V8;
+  if (i::StringShape(*obj).IsExternalTwoByte()) {
+    return false;  // Already an external string.
+  }
+  ENTER_V8(isolate);
   if (isolate->string_tracker()->IsFreshUnusedString(obj)) {
     return false;
   }
   bool result = obj->MakeExternal(resource);
   if (result && !obj->IsSymbol()) {
     isolate->heap()->external_string_table()->AddString(*obj);
   }
   return result;
 }
 
@@ skipping 10 matching lines @@
     return false;
   i::StringShape shape(*obj);
   return !shape.IsExternal();
 }
 
 
 Local<v8::Object> v8::Object::New() {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Object::New()");
   LOG_API(isolate, "Object::New");
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::JSObject> obj =
-      isolate->factory()->NewJSObject(i::Isolate::Current()->object_function());
+      isolate->factory()->NewJSObject(isolate->object_function());
   return Utils::ToLocal(obj);
 }
 
 
 Local<v8::Value> v8::Date::New(double time) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Date::New()");
   LOG_API(isolate, "Date::New");
   if (isnan(time)) {
     // Introduce only canonical NaN value into the VM, to avoid signaling NaNs.
     time = i::OS::nan_value();
   }
-  ENTER_V8;
-  EXCEPTION_PREAMBLE();
+  ENTER_V8(isolate);
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> obj =
       i::Execution::NewDate(time, &has_pending_exception);
-  EXCEPTION_BAILOUT_CHECK(Local<v8::Value>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Value>());
   return Utils::ToLocal(obj);
 }
 
 
 double v8::Date::NumberValue() const {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::Date::NumberValue()")) return 0;
   LOG_API(isolate, "Date::NumberValue");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
   return jsvalue->value()->Number();
 }
 
 
 void v8::Date::DateTimeConfigurationChangeNotification() {
   i::Isolate* isolate = i::Isolate::Current();
   ON_BAILOUT(isolate, "v8::Date::DateTimeConfigurationChangeNotification()",
              return);
   LOG_API(isolate, "Date::DateTimeConfigurationChangeNotification");
-  ENTER_V8;
+  ENTER_V8(isolate);
 
   i::HandleScope scope(isolate);
   // Get the function ResetDateCache (defined in date-delay.js).
   i::Handle<i::String> func_name_str =
       isolate->factory()->LookupAsciiSymbol("ResetDateCache");
   i::MaybeObject* result =
       isolate->js_builtins_object()->GetProperty(*func_name_str);
   i::Object* object_func;
   if (!result->ToObject(&object_func)) {
     return;
@@ skipping 19 matching lines @@
   if ((flags & RegExp::kMultiline) != 0) flags_buf[num_flags++] = 'm';
   if ((flags & RegExp::kIgnoreCase) != 0) flags_buf[num_flags++] = 'i';
   ASSERT(num_flags <= static_cast<int>(ARRAY_SIZE(flags_buf)));
   return FACTORY->LookupSymbol(
       i::Vector<const char>(flags_buf, num_flags));
 }
 
 
 Local<v8::RegExp> v8::RegExp::New(Handle<String> pattern,
                                   Flags flags) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(*pattern)->GetIsolate();
   EnsureInitializedForIsolate(isolate, "v8::RegExp::New()");
   LOG_API(isolate, "RegExp::New");
-  ENTER_V8;
-  EXCEPTION_PREAMBLE();
+  ENTER_V8(isolate);
+  EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::JSRegExp> obj = i::Execution::NewJSRegExp(
       Utils::OpenHandle(*pattern),
       RegExpFlagsToString(flags),
       &has_pending_exception);
-  EXCEPTION_BAILOUT_CHECK(Local<v8::RegExp>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::RegExp>());
   return Utils::ToLocal(i::Handle<i::JSRegExp>::cast(obj));
 }
 
 
 Local<v8::String> v8::RegExp::GetSource() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::RegExp::GetSource()")) {
     return Local<v8::String>();
   }
   i::Handle<i::JSRegExp> obj = Utils::OpenHandle(this);
   return Utils::ToLocal(i::Handle<i::String>(obj->Pattern()));
 }
 
 
 // Assert that the static flags cast in GetFlags is valid.
 #define REGEXP_FLAG_ASSERT_EQ(api_flag, internal_flag)        \
@@ skipping 11 matching lines @@
   }
   i::Handle<i::JSRegExp> obj = Utils::OpenHandle(this);
   return static_cast<RegExp::Flags>(obj->GetFlags().value());
 }
 
 
 Local<v8::Array> v8::Array::New(int length) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Array::New()");
   LOG_API(isolate, "Array::New");
-  ENTER_V8;
+  ENTER_V8(isolate);
   int real_length = length > 0 ? length : 0;
   i::Handle<i::JSArray> obj = isolate->factory()->NewJSArray(real_length);
   obj->set_length(*isolate->factory()->NewNumberFromInt(real_length));
   return Utils::ToLocal(obj);
 }
 
 
 uint32_t v8::Array::Length() const {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::Array::Length()")) return 0;
   i::Handle<i::JSArray> obj = Utils::OpenHandle(this);
   i::Object* length = obj->length();
   if (length->IsSmi()) {
     return i::Smi::cast(length)->value();
   } else {
     return static_cast<uint32_t>(length->Number());
   }
 }
 
 
 Local<Object> Array::CloneElementAt(uint32_t index) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Array::CloneElementAt()", return Local<Object>());
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   if (!self->HasFastElements()) {
     return Local<Object>();
   }
   i::FixedArray* elms = i::FixedArray::cast(self->elements());
   i::Object* paragon = elms->get(index);
   if (!paragon->IsJSObject()) {
     return Local<Object>();
   }
   i::Handle<i::JSObject> paragon_handle(i::JSObject::cast(paragon));
-  EXCEPTION_PREAMBLE();
-  ENTER_V8;
+  EXCEPTION_PREAMBLE(isolate);
+  ENTER_V8(isolate);
   i::Handle<i::JSObject> result = i::Copy(paragon_handle);
   has_pending_exception = result.is_null();
-  EXCEPTION_BAILOUT_CHECK(Local<Object>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<Object>());
   return Utils::ToLocal(result);
 }
 
 
 Local<String> v8::String::NewSymbol(const char* data, int length) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::NewSymbol()");
   LOG_API(isolate, "String::NewSymbol(char)");
-  ENTER_V8;
+  ENTER_V8(isolate);
   if (length == -1) length = i::StrLength(data);
   i::Handle<i::String> result =
-      FACTORY->LookupSymbol(i::Vector<const char>(data, length));
+      isolate->factory()->LookupSymbol(i::Vector<const char>(data, length));
   return Utils::ToLocal(result);
 }
 
 
 Local<Number> v8::Number::New(double value) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Number::New()");
   if (isnan(value)) {
     // Introduce only canonical NaN value into the VM, to avoid signaling NaNs.
     value = i::OS::nan_value();
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Object> result = isolate->factory()->NewNumber(value);
   return Utils::NumberToLocal(result);
 }
 
 
 Local<Integer> v8::Integer::New(int32_t value) {
   i::Isolate* isolate = i::Isolate::UncheckedCurrent();
   EnsureInitializedForIsolate(isolate, "v8::Integer::New()");
   if (i::Smi::IsValid(value)) {
     return Utils::IntegerToLocal(i::Handle<i::Object>(i::Smi::FromInt(value),
                                                       isolate));
   }
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Object> result = isolate->factory()->NewNumber(value);
   return Utils::IntegerToLocal(result);
 }
 
 
 Local<Integer> Integer::NewFromUnsigned(uint32_t value) {
   bool fits_into_int32_t = (value & (1 << 31)) == 0;
   if (fits_into_int32_t) {
     return Integer::New(static_cast<int32_t>(value));
   }
-  ENTER_V8;
-  i::Handle<i::Object> result = FACTORY->NewNumber(value);
+  i::Isolate* isolate = i::Isolate::Current();
+  ENTER_V8(isolate);
+  i::Handle<i::Object> result = isolate->factory()->NewNumber(value);
   return Utils::IntegerToLocal(result);
 }
 
 
 void V8::IgnoreOutOfMemoryException() {
   EnterIsolateIfNeeded()->handle_scope_implementer()->set_ignore_out_of_memory(
       true);
 }
 
 
 bool V8::AddMessageListener(MessageCallback that, Handle<Value> data) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::V8::AddMessageListener()");
   ON_BAILOUT(isolate, "v8::V8::AddMessageListener()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   NeanderArray listeners(isolate->factory()->message_listeners());
   NeanderObject obj(2);
   obj.set(0, *isolate->factory()->NewProxy(FUNCTION_ADDR(that)));
   obj.set(1, data.IsEmpty() ?
              HEAP->undefined_value() :
              *Utils::OpenHandle(*data));
   listeners.add(obj.value());
   return true;
 }
 
 
 void V8::RemoveMessageListeners(MessageCallback that) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::V8::RemoveMessageListener()");
   ON_BAILOUT(isolate, "v8::V8::RemoveMessageListeners()", return);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   NeanderArray listeners(isolate->factory()->message_listeners());
   for (int i = 0; i < listeners.length(); i++) {
     if (listeners.get(i)->IsUndefined()) continue;  // skip deleted ones
 
     NeanderObject listener(i::JSObject::cast(listeners.get(i)));
     i::Handle<i::Proxy> callback_obj(i::Proxy::cast(listener.get(0)));
     if (callback_obj->proxy() == FUNCTION_ADDR(that)) {
       listeners.set(i, HEAP->undefined_value());
     }
@@ skipping 204 matching lines @@
 int V8::GetLogLines(int from_pos, char* dest_buf, int max_size) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   ASSERT(max_size >= kMinimumSizeForLogLinesBuffer);
   return LOGGER->GetLogLines(from_pos, dest_buf, max_size);
 #endif
   return 0;
 }
 
 
 int V8::GetCurrentThreadId() {
+  i::Isolate* isolate = i::Isolate::Current();
   API_ENTRY_CHECK("V8::GetCurrentThreadId()");
-  EnsureInitialized("V8::GetCurrentThreadId()");
-  return i::Isolate::Current()->thread_id();
+  EnsureInitializedForIsolate(isolate, "V8::GetCurrentThreadId()");
+  return isolate->thread_id();
 }
 
 
 void V8::TerminateExecution(int thread_id) {
-  if (!i::Isolate::Current()->IsInitialized()) return;
+  i::Isolate* isolate = i::Isolate::Current();
+  if (!isolate->IsInitialized()) return;
   API_ENTRY_CHECK("V8::GetCurrentThreadId()");
-  i::Isolate* isolate = i::Isolate::Current();
   // If the thread_id identifies the current thread just terminate
   // execution right away.  Otherwise, ask the thread manager to
   // terminate the thread with the given id if any.
   if (thread_id == isolate->thread_id()) {
     isolate->stack_guard()->TerminateExecution();
   } else {
     isolate->thread_manager()->TerminateExecution(thread_id);
   }
 }
 
@@ skipping 47 matching lines @@
 }
 
 
 void Isolate::Exit() {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   isolate->Exit();
 }
 
 
 String::Utf8Value::Utf8Value(v8::Handle<v8::Value> obj) {
-  EnsureInitialized("v8::String::Utf8Value::Utf8Value()");
+  i::Isolate* isolate = i::Isolate::Current();
+  if (IsDeadCheck(isolate, "v8::String::Utf8Value::Utf8Value()")) return;
   if (obj.IsEmpty()) {
     str_ = NULL;
     length_ = 0;
     return;
   }
-  ENTER_V8;
-  HandleScope scope;
+  ENTER_V8(isolate);
+  i::HandleScope scope(isolate);
   TryCatch try_catch;
   Handle<String> str = obj->ToString();
   if (str.IsEmpty()) {
     str_ = NULL;
     length_ = 0;
   } else {
     length_ = str->Utf8Length();
     str_ = i::NewArray<char>(length_ + 1);
     str->WriteUtf8(str_);
   }
 }
 
 
 String::Utf8Value::~Utf8Value() {
   i::DeleteArray(str_);
 }
 
 
 String::AsciiValue::AsciiValue(v8::Handle<v8::Value> obj) {
-  EnsureInitialized("v8::String::AsciiValue::AsciiValue()");
+  i::Isolate* isolate = i::Isolate::Current();
+  if (IsDeadCheck(isolate, "v8::String::AsciiValue::AsciiValue()")) return;
   if (obj.IsEmpty()) {
     str_ = NULL;
     length_ = 0;
     return;
   }
-  ENTER_V8;
-  HandleScope scope;
+  ENTER_V8(isolate);
+  i::HandleScope scope(isolate);
   TryCatch try_catch;
   Handle<String> str = obj->ToString();
   if (str.IsEmpty()) {
     str_ = NULL;
     length_ = 0;
   } else {
     length_ = str->Length();
     str_ = i::NewArray<char>(length_ + 1);
     str->WriteAscii(str_);
   }
 }
 
 
 String::AsciiValue::~AsciiValue() {
   i::DeleteArray(str_);
 }
 
 
 String::Value::Value(v8::Handle<v8::Value> obj) {
-  EnsureInitialized("v8::String::Value::Value()");
+  i::Isolate* isolate = i::Isolate::Current();
+  if (IsDeadCheck(isolate, "v8::String::Value::Value()")) return;
   if (obj.IsEmpty()) {
     str_ = NULL;
     length_ = 0;
     return;
   }
-  ENTER_V8;
-  HandleScope scope;
+  ENTER_V8(isolate);
+  i::HandleScope scope(isolate);
   TryCatch try_catch;
   Handle<String> str = obj->ToString();
   if (str.IsEmpty()) {
     str_ = NULL;
     length_ = 0;
   } else {
     length_ = str->Length();
     str_ = i::NewArray<uint16_t>(length_ + 1);
     str->Write(str_);
   }
 }
 
 
 String::Value::~Value() {
   i::DeleteArray(str_);
 }
 
 Local<Value> Exception::RangeError(v8::Handle<v8::String> raw_message) {
   i::Isolate* isolate = i::Isolate::Current();
   LOG_API(isolate, "RangeError");
   ON_BAILOUT(isolate, "v8::Exception::RangeError()", return Local<Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Object* error;
   {
     i::HandleScope scope(isolate);
     i::Handle<i::String> message = Utils::OpenHandle(*raw_message);
     i::Handle<i::Object> result = FACTORY->NewRangeError(message);
     error = *result;
   }
   i::Handle<i::Object> result(error);
   return Utils::ToLocal(result);
 }
 
 Local<Value> Exception::ReferenceError(v8::Handle<v8::String> raw_message) {
   i::Isolate* isolate = i::Isolate::Current();
   LOG_API(isolate, "ReferenceError");
   ON_BAILOUT(isolate, "v8::Exception::ReferenceError()", return Local<Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Object* error;
   {
     i::HandleScope scope(isolate);
     i::Handle<i::String> message = Utils::OpenHandle(*raw_message);
     i::Handle<i::Object> result = FACTORY->NewReferenceError(message);
     error = *result;
   }
   i::Handle<i::Object> result(error);
   return Utils::ToLocal(result);
 }
 
 Local<Value> Exception::SyntaxError(v8::Handle<v8::String> raw_message) {
   i::Isolate* isolate = i::Isolate::Current();
   LOG_API(isolate, "SyntaxError");
   ON_BAILOUT(isolate, "v8::Exception::SyntaxError()", return Local<Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Object* error;
   {
     i::HandleScope scope(isolate);
     i::Handle<i::String> message = Utils::OpenHandle(*raw_message);
     i::Handle<i::Object> result = FACTORY->NewSyntaxError(message);
     error = *result;
   }
   i::Handle<i::Object> result(error);
   return Utils::ToLocal(result);
 }
 
 Local<Value> Exception::TypeError(v8::Handle<v8::String> raw_message) {
   i::Isolate* isolate = i::Isolate::Current();
   LOG_API(isolate, "TypeError");
   ON_BAILOUT(isolate, "v8::Exception::TypeError()", return Local<Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Object* error;
   {
     i::HandleScope scope(isolate);
     i::Handle<i::String> message = Utils::OpenHandle(*raw_message);
     i::Handle<i::Object> result = FACTORY->NewTypeError(message);
     error = *result;
   }
   i::Handle<i::Object> result(error);
   return Utils::ToLocal(result);
 }
 
 Local<Value> Exception::Error(v8::Handle<v8::String> raw_message) {
   i::Isolate* isolate = i::Isolate::Current();
   LOG_API(isolate, "Error");
   ON_BAILOUT(isolate, "v8::Exception::Error()", return Local<Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Object* error;
   {
     i::HandleScope scope(isolate);
     i::Handle<i::String> message = Utils::OpenHandle(*raw_message);
     i::Handle<i::Object> result = FACTORY->NewError(message);
     error = *result;
   }
   i::Handle<i::Object> result(error);
   return Utils::ToLocal(result);
 }
@@ skipping 11 matching lines @@
                                     event_details.GetEventData(),
                                     event_details.GetCallbackData());
   }
 }
 
 
 bool Debug::SetDebugEventListener(EventCallback that, Handle<Value> data) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Debug::SetDebugEventListener()");
   ON_BAILOUT(isolate, "v8::Debug::SetDebugEventListener()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
 
   isolate->set_debug_event_callback(that);
 
   i::HandleScope scope(isolate);
   i::Handle<i::Object> proxy = isolate->factory()->undefined_value();
   if (that != NULL) {
     proxy = isolate->factory()->NewProxy(FUNCTION_ADDR(EventCallbackWrapper));
   }
   isolate->debugger()->SetEventListener(proxy, Utils::OpenHandle(*data));
   return true;
 }
 
 
 bool Debug::SetDebugEventListener2(EventCallback2 that, Handle<Value> data) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Debug::SetDebugEventListener2()");
   ON_BAILOUT(isolate, "v8::Debug::SetDebugEventListener2()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::Object> proxy = isolate->factory()->undefined_value();
   if (that != NULL) {
     proxy = isolate->factory()->NewProxy(FUNCTION_ADDR(that));
   }
   isolate->debugger()->SetEventListener(proxy,
                                                       Utils::OpenHandle(*data));
   return true;
 }
 
 
 bool Debug::SetDebugEventListener(v8::Handle<v8::Object> that,
                                   Handle<Value> data) {
   i::Isolate* isolate = i::Isolate::Current();
   ON_BAILOUT(isolate, "v8::Debug::SetDebugEventListener()", return false);
-  ENTER_V8;
+  ENTER_V8(isolate);
   isolate->debugger()->SetEventListener(Utils::OpenHandle(*that),
                                                       Utils::OpenHandle(*data));
   return true;
 }
 
 
 void Debug::DebugBreak(Isolate* isolate) {
   // If no isolate is supplied, use the default isolate.
   if (isolate != NULL) {
     reinterpret_cast<i::Isolate*>(isolate)->stack_guard()->DebugBreak();
@@ skipping 29 matching lines @@
   i::Isolate* isolate = i::Isolate::Current();
   if (isolate->message_handler()) {
     v8::String::Value json(message.GetJSON());
     (isolate->message_handler())(*json, json.length(), message.GetClientData());
   }
 }
 
 
 void Debug::SetMessageHandler(v8::Debug::MessageHandler handler,
                               bool message_handler_thread) {
-  EnsureInitialized("v8::Debug::SetMessageHandler");
-  ENTER_V8;
   i::Isolate* isolate = i::Isolate::Current();
+  EnsureInitializedForIsolate(isolate, "v8::Debug::SetMessageHandler");
+  ENTER_V8(isolate);
+
   // Message handler thread not supported any more. Parameter temporally left in
-  // the API for client compatability reasons.
+  // the API for client compatibility reasons.
   CHECK(!message_handler_thread);
 
   // TODO(sgjesse) support the old message handler API through a simple wrapper.
   isolate->set_message_handler(handler);
   if (handler != NULL) {
     i::Isolate::Current()->debugger()->SetMessageHandler(MessageHandlerWrapper);
   } else {
     i::Isolate::Current()->debugger()->SetMessageHandler(NULL);
   }
 }
 
 
 void Debug::SetMessageHandler2(v8::Debug::MessageHandler2 handler) {
-  EnsureInitialized("v8::Debug::SetMessageHandler");
-  ENTER_V8;
-  i::Isolate::Current()->debugger()->SetMessageHandler(handler);
+  i::Isolate* isolate = i::Isolate::Current();
+  EnsureInitializedForIsolate(isolate, "v8::Debug::SetMessageHandler");
+  ENTER_V8(isolate);
+  isolate->debugger()->SetMessageHandler(handler);
 }
 
 
 void Debug::SendCommand(const uint16_t* command, int length,
                         ClientData* client_data,
                         Isolate* isolate) {
   // If no isolate is supplied, use the default isolate.
   if (isolate != NULL) {
     i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
     internal_isolate->debugger()->ProcessCommand(
         i::Vector<const uint16_t>(command, length), client_data);
   } else {
     i::Isolate::GetDefaultIsolateDebugger()->ProcessCommand(
         i::Vector<const uint16_t>(command, length), client_data);
   }
 }
 
 
 void Debug::SetHostDispatchHandler(HostDispatchHandler handler,
                                    int period) {
-  EnsureInitialized("v8::Debug::SetHostDispatchHandler");
-  ENTER_V8;
-  i::Isolate::Current()->debugger()->SetHostDispatchHandler(handler, period);
+  i::Isolate* isolate = i::Isolate::Current();
+  EnsureInitializedForIsolate(isolate, "v8::Debug::SetHostDispatchHandler");
+  ENTER_V8(isolate);
+  isolate->debugger()->SetHostDispatchHandler(handler, period);
 }
 
 
 void Debug::SetDebugMessageDispatchHandler(
     DebugMessageDispatchHandler handler, bool provide_locker) {
-  EnsureInitialized("v8::Debug::SetDebugMessageDispatchHandler");
-  ENTER_V8;
-  i::Isolate::Current()->debugger()->SetDebugMessageDispatchHandler(
+  i::Isolate* isolate = i::Isolate::Current();
+  EnsureInitializedForIsolate(isolate,
+                              "v8::Debug::SetDebugMessageDispatchHandler");
+  ENTER_V8(isolate);
+  isolate->debugger()->SetDebugMessageDispatchHandler(
       handler, provide_locker);
 }
 
 
 Local<Value> Debug::Call(v8::Handle<v8::Function> fun,
                          v8::Handle<v8::Value> data) {
   i::Isolate* isolate = i::Isolate::Current();
   if (!isolate->IsInitialized()) return Local<Value>();
   ON_BAILOUT(isolate, "v8::Debug::Call()", return Local<Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   i::Handle<i::Object> result;
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   if (data.IsEmpty()) {
     result =
-        i::Isolate::Current()->debugger()->Call(Utils::OpenHandle(*fun),
-                                                FACTORY->undefined_value(),
-                                                &has_pending_exception);
+        isolate->debugger()->Call(Utils::OpenHandle(*fun),
+                                  isolate->factory()->undefined_value(),
+                                  &has_pending_exception);
   } else {
-    result = i::Isolate::Current()->debugger()->Call(Utils::OpenHandle(*fun),
-                                                     Utils::OpenHandle(*data),
-                                                     &has_pending_exception);
+    result = isolate->debugger()->Call(Utils::OpenHandle(*fun),
+                                       Utils::OpenHandle(*data),
+                                       &has_pending_exception);
   }
-  EXCEPTION_BAILOUT_CHECK(Local<Value>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
   return Utils::ToLocal(result);
 }
 
 
 Local<Value> Debug::GetMirror(v8::Handle<v8::Value> obj) {
   i::Isolate* isolate = i::Isolate::Current();
   if (!isolate->IsInitialized()) return Local<Value>();
   ON_BAILOUT(isolate, "v8::Debug::GetMirror()", return Local<Value>());
-  ENTER_V8;
+  ENTER_V8(isolate);
   v8::HandleScope scope;
-  i::Debug* isolate_debug = i::Isolate::Current()->debug();
+  i::Debug* isolate_debug = isolate->debug();
   isolate_debug->Load();
   i::Handle<i::JSObject> debug(isolate_debug->debug_context()->global());
   i::Handle<i::String> name = FACTORY->LookupAsciiSymbol("MakeMirror");
   i::Handle<i::Object> fun_obj = i::GetProperty(debug, name);
   i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>::cast(fun_obj);
   v8::Handle<v8::Function> v8_fun = Utils::ToLocal(fun);
   const int kArgc = 1;
   v8::Handle<v8::Value> argv[kArgc] = { obj };
-  EXCEPTION_PREAMBLE();
+  EXCEPTION_PREAMBLE(isolate);
   v8::Handle<v8::Value> result = v8_fun->Call(Utils::ToLocal(debug),
                                               kArgc,
                                               argv);
-  EXCEPTION_BAILOUT_CHECK(Local<Value>());
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
   return scope.Close(result);
 }
 
 
 bool Debug::EnableAgent(const char* name, int port, bool wait_for_connection) {
   return i::Isolate::Current()->debugger()->StartAgent(name, port,
                                                        wait_for_connection);
 }
 
 void Debug::ProcessDebugMessages() {
   i::Execution::ProcessDebugMesssages(true);
 }
 
 Local<Context> Debug::GetDebugContext() {
-  EnsureInitialized("v8::Debug::GetDebugContext()");
-  ENTER_V8;
+  i::Isolate* isolate = i::Isolate::Current();
+  EnsureInitializedForIsolate(isolate, "v8::Debug::GetDebugContext()");
+  ENTER_V8(isolate);
   return Utils::ToLocal(i::Isolate::Current()->debugger()->GetDebugContext());
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 
 Handle<String> CpuProfileNode::GetFunctionName() const {
   i::Isolate* isolate = i::Isolate::Current();
@@ skipping 647 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* thread_local =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   thread_local->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal