A64: Synchronize with r16918.

src/api.cc

 // Copyright 2012 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 59 matching lines @@
 
 #define LOG_API(isolate, expr) LOG(isolate, ApiEntryCall(expr))
 
 #define ENTER_V8(isolate)                                          \
   ASSERT((isolate)->IsInitialized());                              \
   i::VMState<i::OTHER> __state__((isolate))
 
 namespace v8 {
 
 #define ON_BAILOUT(isolate, location, code)                        \
-  if (IsDeadCheck(isolate, location) ||                            \
-      IsExecutionTerminatingCheck(isolate)) {                      \
+  if (IsExecutionTerminatingCheck(isolate)) {                      \
     code;                                                          \
     UNREACHABLE();                                                 \
   }
 
 
 #define EXCEPTION_PREAMBLE(isolate)                                         \
   (isolate)->handle_scope_implementer()->IncrementCallDepth();              \
   ASSERT(!(isolate)->external_caught_exception());                          \
   bool has_pending_exception = false
 
@@ skipping 154 matching lines @@
 }
 
 
 static inline bool ApiCheck(bool condition,
                             const char* location,
                             const char* message) {
   return condition ? true : Utils::ReportApiFailure(location, message);
 }
 
 
-static bool ReportV8Dead(const char* location) {
-  FatalErrorCallback callback = GetFatalErrorHandler();
-  callback(location, "V8 is no longer usable");
-  return true;
-}
-
-
 static bool ReportEmptyHandle(const char* location) {
   FatalErrorCallback callback = GetFatalErrorHandler();
   callback(location, "Reading from empty handle");
   return true;
 }
 
 
-/**
- * IsDeadCheck checks that the vm is usable.  If, for instance, the vm has been
- * out of memory at some point this check will fail.  It should be called on
- * entry to all methods that touch anything in the heap, except destructors
- * which you sometimes can't avoid calling after the vm has crashed.  Functions
- * that call EnsureInitialized or ON_BAILOUT don't have to also call
- * IsDeadCheck.  ON_BAILOUT has the advantage over EnsureInitialized that you
- * can arrange to return if the VM is dead.  This is needed to ensure that no VM
- * heap allocations are attempted on a dead VM.  EnsureInitialized has the
- * advantage over ON_BAILOUT that it actually initializes the VM if this has not
- * yet been done.
- */
-static inline bool IsDeadCheck(i::Isolate* isolate, const char* location) {
-  return !isolate->IsInitialized()
-      && isolate->IsDead() ? ReportV8Dead(location) : false;
-}
-
-
 static inline bool IsExecutionTerminatingCheck(i::Isolate* isolate) {
   if (!isolate->IsInitialized()) return false;
   if (isolate->has_scheduled_exception()) {
     return isolate->scheduled_exception() ==
         isolate->heap()->termination_exception();
   }
   return false;
 }
 
 
@@ skipping 16 matching lines @@
   if (isolate == NULL || isolate->function_entry_hook() == NULL) {
     if (i::Snapshot::Initialize())
       return true;
   }
   return i::V8::Initialize(NULL);
 }
 
 
 static inline bool EnsureInitializedForIsolate(i::Isolate* isolate,
                                                const char* location) {
-  if (IsDeadCheck(isolate, location)) return false;
   if (isolate != NULL) {
     if (isolate->IsInitialized()) return true;
   }
   ASSERT(isolate == i::Isolate::Current());
   return ApiCheck(InitializeHelper(isolate), location, "Error initializing V8");
 }
 
 
 // Some initializing API functions are called early and may be
 // called on a thread different from static initializer thread.
@@ skipping 159 matching lines @@
 }
 
 
 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(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(isolate->heap()->undefined_value());
   } else {
     isolate->ScheduleThrow(*Utils::OpenHandle(*value));
   }
   return v8::Undefined();
 }
@@ skipping 110 matching lines @@
   if (constraints->is_memory_constrained().has_value &&
       !i::FLAG_force_memory_constrained.has_value) {
     isolate->set_is_memory_constrained(
         constraints->is_memory_constrained().value);
   }
   return true;
 }
 
 
 i::Object** V8::GlobalizeReference(i::Isolate* isolate, i::Object** obj) {
-  if (IsDeadCheck(isolate, "V8::Persistent::New")) return NULL;
   LOG_API(isolate, "Persistent::New");
   i::Handle<i::Object> result = isolate->global_handles()->Create(*obj);
 #ifdef DEBUG
   (*obj)->Verify();
 #endif  // DEBUG
   return result.location();
 }
 
 
 i::Object** V8::CopyPersistent(i::Object** obj) {
@@ skipping 95 matching lines @@
 i::Object** HandleScope::CreateHandle(i::HeapObject* value) {
   ASSERT(value->IsHeapObject());
   return reinterpret_cast<i::Object**>(
       i::HandleScope::CreateHandle(value->GetIsolate(), value));
 }
 
 
 void Context::Enter() {
   i::Handle<i::Context> env = Utils::OpenHandle(this);
   i::Isolate* isolate = env->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::Context::Enter()")) return;
   ENTER_V8(isolate);
-
   isolate->handle_scope_implementer()->EnterContext(env);
-
   isolate->handle_scope_implementer()->SaveContext(isolate->context());
   isolate->set_context(*env);
 }
 
 
 void Context::Exit() {
-  // Exit is essentially a static function and doesn't use the
-  // receiver, so we have to get the current isolate from the thread
-  // local.
+  // TODO(dcarney): fix this once chrome is fixed.
   i::Isolate* isolate = i::Isolate::Current();
-  if (!isolate->IsInitialized()) return;
-
-  if (!ApiCheck(isolate->handle_scope_implementer()->LeaveLastContext(),
+  i::Handle<i::Context> context = i::Handle<i::Context>::null();
+  ENTER_V8(isolate);
+  if (!ApiCheck(isolate->handle_scope_implementer()->LeaveContext(context),
                 "v8::Context::Exit()",
                 "Cannot exit non-entered context")) {
     return;
   }
-
   // Content of 'last_context' could be NULL.
   i::Context* last_context =
       isolate->handle_scope_implementer()->RestoreContext();
   isolate->set_context(last_context);
 }
 
 
 static void* DecodeSmiToAligned(i::Object* value, const char* location) {
   ApiCheck(value->IsSmi(), location, "Not a Smi");
   return reinterpret_cast<void*>(value);
 }
 
 
 static i::Smi* EncodeAlignedAsSmi(void* value, const char* location) {
   i::Smi* smi = reinterpret_cast<i::Smi*>(value);
   ApiCheck(smi->IsSmi(), location, "Pointer is not aligned");
   return smi;
 }
 
 
 static i::Handle<i::FixedArray> EmbedderDataFor(Context* context,
                                                 int index,
                                                 bool can_grow,
                                                 const char* location) {
   i::Handle<i::Context> env = Utils::OpenHandle(context);
-  bool ok = !IsDeadCheck(env->GetIsolate(), location) &&
+  bool ok =
       ApiCheck(env->IsNativeContext(), location, "Not a native context") &&
       ApiCheck(index >= 0, location, "Negative index");
   if (!ok) return i::Handle<i::FixedArray>();
   i::Handle<i::FixedArray> data(env->embedder_data());
   if (index < data->length()) return data;
   if (!can_grow) {
     Utils::ReportApiFailure(location, "Index too large");
     return i::Handle<i::FixedArray>();
   }
   int new_size = i::Max(index, data->length() << 1) + 1;
@@ skipping 156 matching lines @@
         Utils::OpenHandle(*data[i]);
     array.add(value);
   }
 }
 
 
 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(isolate);
   i::HandleScope scope(isolate);
   const int kSize = 3;
   v8::Handle<v8::Data> data[kSize] = {
       name,
       value,
       v8::Integer::New(attribute)};
   TemplateSet(isolate, this, kSize, data);
 }
 
 
 void Template::SetAccessorProperty(
     v8::Local<v8::String> name,
     v8::Local<FunctionTemplate> getter,
     v8::Local<FunctionTemplate> setter,
     v8::PropertyAttribute attribute,
     v8::AccessControl access_control) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::Template::SetAccessor()")) return;
   ENTER_V8(isolate);
   ASSERT(!name.IsEmpty());
   ASSERT(!getter.IsEmpty() || !setter.IsEmpty());
   i::HandleScope scope(isolate);
   const int kSize = 5;
   v8::Handle<v8::Data> data[kSize] = {
       name,
       getter,
       setter,
       v8::Integer::New(attribute),
       v8::Integer::New(access_control)};
   TemplateSet(isolate, this, kSize, data);
 }
 
 
 // --- 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 = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::FunctionTemplate::PrototypeTemplate()")) {
-    return Local<ObjectTemplate>();
-  }
   ENTER_V8(isolate);
   i::Handle<i::Object> result(Utils::OpenHandle(this)->prototype_template(),
                               isolate);
   if (result->IsUndefined()) {
     result = Utils::OpenHandle(*ObjectTemplate::New());
     Utils::OpenHandle(this)->set_prototype_template(*result);
   }
   return ToApiHandle<ObjectTemplate>(result);
 }
 
 
 void FunctionTemplate::Inherit(v8::Handle<FunctionTemplate> value) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::FunctionTemplate::Inherit()")) return;
   ENTER_V8(isolate);
   Utils::OpenHandle(this)->set_parent_template(*Utils::OpenHandle(*value));
 }
 
 
 static Local<FunctionTemplate> FunctionTemplateNew(
     i::Isolate* isolate,
     FunctionCallback callback,
     v8::Handle<Value> data,
     v8::Handle<Signature> signature,
@@ skipping 222 matching lines @@
 
 #define SET_FIELD_WRAPPED(obj, setter, cdata) do {    \
     i::Handle<i::Object> foreign = FromCData(obj->GetIsolate(), cdata);  \
     (obj)->setter(*foreign);                          \
   } while (false)
 
 
 void FunctionTemplate::SetCallHandler(FunctionCallback callback,
                                       v8::Handle<Value> data) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::FunctionTemplate::SetCallHandler()")) return;
   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_call_code(*obj);
@@ skipping 50 matching lines @@
   if (descriptor.IsEmpty()) return i::Handle<i::DeclaredAccessorInfo>();
   i::Handle<i::DeclaredAccessorInfo> obj =
       isolate->factory()->NewDeclaredAccessorInfo();
   obj->set_descriptor(*Utils::OpenHandle(*descriptor));
   return SetAccessorInfoProperties(obj, name, settings, attributes, signature);
 }
 
 
 Local<ObjectTemplate> FunctionTemplate::InstanceTemplate() {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::FunctionTemplate::InstanceTemplate()")
-      || EmptyCheck("v8::FunctionTemplate::InstanceTemplate()", this))
+  if (EmptyCheck("v8::FunctionTemplate::InstanceTemplate()", this))
     return Local<ObjectTemplate>();
   ENTER_V8(isolate);
   i::Handle<i::FunctionTemplateInfo> handle = Utils::OpenHandle(this);
   if (handle->instance_template()->IsUndefined()) {
     Local<ObjectTemplate> templ =
         ObjectTemplate::New(ToApiHandle<FunctionTemplate>(handle));
     handle->set_instance_template(*Utils::OpenHandle(*templ));
   }
   i::Handle<i::ObjectTemplateInfo> result(
       i::ObjectTemplateInfo::cast(handle->instance_template()));
   return Utils::ToLocal(result);
 }
 
 
 void FunctionTemplate::SetLength(int length) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::FunctionTemplate::SetLength()")) return;
   ENTER_V8(isolate);
   Utils::OpenHandle(this)->set_length(length);
 }
 
 
 void FunctionTemplate::SetClassName(Handle<String> name) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::FunctionTemplate::SetClassName()")) return;
   ENTER_V8(isolate);
   Utils::OpenHandle(this)->set_class_name(*Utils::OpenHandle(*name));
 }
 
 
 void FunctionTemplate::SetHiddenPrototype(bool value) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::FunctionTemplate::SetHiddenPrototype()")) {
-    return;
-  }
   ENTER_V8(isolate);
   Utils::OpenHandle(this)->set_hidden_prototype(value);
 }
 
 
 void FunctionTemplate::ReadOnlyPrototype() {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::FunctionTemplate::ReadOnlyPrototype()")) {
-    return;
-  }
   ENTER_V8(isolate);
   Utils::OpenHandle(this)->set_read_only_prototype(true);
 }
 
 
 void FunctionTemplate::RemovePrototype() {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::FunctionTemplate::RemovePrototype()")) {
-    return;
-  }
   ENTER_V8(isolate);
   Utils::OpenHandle(this)->set_remove_prototype(true);
 }
 
 
 // --- 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(isolate);
   i::Handle<i::Struct> struct_obj =
       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));
@@ skipping 50 matching lines @@
 static bool TemplateSetAccessor(
     Template* template_obj,
     v8::Local<String> name,
     Getter getter,
     Setter setter,
     Data data,
     AccessControl settings,
     PropertyAttribute attribute,
     v8::Local<AccessorSignature> signature) {
   i::Isolate* isolate = Utils::OpenHandle(template_obj)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetAccessor()")) return false;
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::AccessorInfo> obj = MakeAccessorInfo(
       name, getter, setter, data, settings, attribute, signature);
   if (obj.is_null()) return false;
   i::Handle<i::TemplateInfo> info = GetTemplateInfo(template_obj);
   AddPropertyToTemplate(info, obj);
   return true;
 }
 
@@ skipping 35 matching lines @@
 
 
 void ObjectTemplate::SetNamedPropertyHandler(
     NamedPropertyGetterCallback getter,
     NamedPropertySetterCallback setter,
     NamedPropertyQueryCallback query,
     NamedPropertyDeleterCallback remover,
     NamedPropertyEnumeratorCallback enumerator,
     Handle<Value> data) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetNamedPropertyHandler()")) {
-    return;
-  }
   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);
   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));
   cons->set_named_property_handler(*obj);
 }
 
 
 void ObjectTemplate::MarkAsUndetectable() {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::ObjectTemplate::MarkAsUndetectable()")) return;
   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 = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetAccessCheckCallbacks()")) {
-    return;
-  }
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   EnsureConstructor(this);
 
   i::Handle<i::Struct> struct_info =
       isolate->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);
@@ skipping 11 matching lines @@
 
 
 void ObjectTemplate::SetIndexedPropertyHandler(
       IndexedPropertyGetterCallback getter,
       IndexedPropertySetterCallback setter,
       IndexedPropertyQueryCallback query,
       IndexedPropertyDeleterCallback remover,
       IndexedPropertyEnumeratorCallback enumerator,
       Handle<Value> data) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetIndexedPropertyHandler()")) {
-    return;
-  }
   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);
   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));
   cons->set_indexed_property_handler(*obj);
 }
 
 
 void ObjectTemplate::SetCallAsFunctionHandler(FunctionCallback callback,
                                               Handle<Value> data) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate,
-                  "v8::ObjectTemplate::SetCallAsFunctionHandler()")) {
-    return;
-  }
   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);
   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));
   cons->set_instance_call_handler(*obj);
 }
 
 
 int ObjectTemplate::InternalFieldCount() {
-  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 = 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(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.
@@ skipping 402 matching lines @@
   HandleScope scope(reinterpret_cast<Isolate*>(isolate));
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::String> raw_result = i::MessageHandler::GetMessage(isolate, obj);
   Local<String> result = Utils::ToLocal(raw_result);
   return scope.Close(result);
 }
 
 
 v8::Handle<Value> Message::GetScriptResourceName() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::Message::GetScriptResourceName()")) {
-    return Local<String>();
-  }
   ENTER_V8(isolate);
   HandleScope scope(reinterpret_cast<Isolate*>(isolate));
   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(),
                                                        isolate));
   i::Handle<i::Object> resource_name(i::Script::cast(script->value())->name(),
                                      isolate);
   return scope.Close(Utils::ToLocal(resource_name));
 }
 
 
 v8::Handle<Value> Message::GetScriptData() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::Message::GetScriptResourceData()")) {
-    return Local<Value>();
-  }
   ENTER_V8(isolate);
   HandleScope scope(reinterpret_cast<Isolate*>(isolate));
   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(),
                                                        isolate));
   i::Handle<i::Object> data(i::Script::cast(script->value())->data(), isolate);
   return scope.Close(Utils::ToLocal(data));
 }
 
 
 v8::Handle<v8::StackTrace> Message::GetStackTrace() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::Message::GetStackTrace()")) {
-    return Local<v8::StackTrace>();
-  }
   ENTER_V8(isolate);
   HandleScope scope(reinterpret_cast<Isolate*>(isolate));
   i::Handle<i::JSMessageObject> message =
       i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
   i::Handle<i::Object> stackFramesObj(message->stack_frames(), isolate);
   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 39 matching lines @@
   i::Handle<i::Object> result = CallV8HeapFunction("GetLineNumber",
                                                    Utils::OpenHandle(this),
                                                    &has_pending_exception);
   EXCEPTION_BAILOUT_CHECK(isolate, 0);
   return static_cast<int>(result->Number());
 }
 
 
 int Message::GetStartPosition() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::Message::GetStartPosition()")) return 0;
   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 = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::Message::GetEndPosition()")) return 0;
   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 = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::Message::GetStartColumn()")) {
-    return kNoColumnInfo;
-  }
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> data_obj = Utils::OpenHandle(this);
   EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> start_col_obj = CallV8HeapFunction(
       "GetPositionInLine",
       data_obj,
       &has_pending_exception);
   EXCEPTION_BAILOUT_CHECK(isolate, 0);
   return static_cast<int>(start_col_obj->Number());
 }
 
 
 int Message::GetEndColumn() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::Message::GetEndColumn()")) return kNoColumnInfo;
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> data_obj = Utils::OpenHandle(this);
   EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> start_col_obj = CallV8HeapFunction(
       "GetPositionInLine",
       data_obj,
       &has_pending_exception);
   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);
 }
 
 
 bool Message::IsSharedCrossOrigin() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::Message::IsSharedCrossOrigin()")) return 0;
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSMessageObject> message =
       i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
   i::Handle<i::JSValue> script =
       i::Handle<i::JSValue>::cast(i::Handle<i::Object>(message->script(),
                                                        isolate));
   return i::Script::cast(script->value())->is_shared_cross_origin();
 }
 
@@ skipping 11 matching lines @@
   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(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 = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::StackTrace::GetFrame()")) {
-    return Local<StackFrame>();
-  }
   ENTER_V8(isolate);
   HandleScope scope(reinterpret_cast<Isolate*>(isolate));
   i::Handle<i::JSArray> self = Utils::OpenHandle(this);
   i::Object* raw_object = self->GetElementNoExceptionThrown(isolate, index);
   i::Handle<i::JSObject> obj(i::JSObject::cast(raw_object));
   return scope.Close(Utils::StackFrameToLocal(obj));
 }
 
 
 int StackTrace::GetFrameCount() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::StackTrace::GetFrameCount()")) return -1;
   ENTER_V8(isolate);
   return i::Smi::cast(Utils::OpenHandle(this)->length())->value();
 }
 
 
 Local<Array> StackTrace::AsArray() {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::StackTrace::AsArray()")) Local<Array>();
   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(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 = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::StackFrame::GetLineNumber()")) {
-    return Message::kNoLineNumberInfo;
-  }
   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 = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::StackFrame::GetColumn()")) {
-    return Message::kNoColumnInfo;
-  }
   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();
 }
 
 
 int StackFrame::GetScriptId() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::StackFrame::GetScriptId()")) {
-    return Message::kNoScriptIdInfo;
-  }
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> scriptId = GetProperty(self, "scriptId");
   if (!scriptId->IsSmi()) {
     return Message::kNoScriptIdInfo;
   }
   return i::Smi::cast(*scriptId)->value();
 }
 
 
 Local<String> StackFrame::GetScriptName() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::StackFrame::GetScriptName()")) {
-    return Local<String>();
-  }
   ENTER_V8(isolate);
   HandleScope scope(reinterpret_cast<Isolate*>(isolate));
   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 = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::StackFrame::GetScriptNameOrSourceURL()")) {
-    return Local<String>();
-  }
   ENTER_V8(isolate);
   HandleScope scope(reinterpret_cast<Isolate*>(isolate));
   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 = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::StackFrame::GetFunctionName()")) {
-    return Local<String>();
-  }
   ENTER_V8(isolate);
   HandleScope scope(reinterpret_cast<Isolate*>(isolate));
   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 = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::StackFrame::IsEval()")) return false;
   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 = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::StackFrame::IsConstructor()")) return false;
   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();
 }
 
 
 // --- J S O N ---
 
@@ skipping 14 matching lines @@
   has_pending_exception = result.is_null();
   EXCEPTION_BAILOUT_CHECK(isolate, Local<Object>());
   return Utils::ToLocal(
       i::Handle<i::Object>::cast(scope.CloseAndEscape(result)));
 }
 
 
 // --- D a t a ---
 
 bool Value::FullIsUndefined() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsUndefined()")) {
-    return false;
-  }
   bool result = Utils::OpenHandle(this)->IsUndefined();
   ASSERT_EQ(result, QuickIsUndefined());
   return result;
 }
 
 
 bool Value::FullIsNull() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsNull()")) return false;
   bool result = Utils::OpenHandle(this)->IsNull();
   ASSERT_EQ(result, QuickIsNull());
   return result;
 }
 
 
 bool Value::IsTrue() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsTrue()")) return false;
   return Utils::OpenHandle(this)->IsTrue();
 }
 
 
 bool Value::IsFalse() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsFalse()")) return false;
   return Utils::OpenHandle(this)->IsFalse();
 }
 
 
 bool Value::IsFunction() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsFunction()")) {
-    return false;
-  }
   return Utils::OpenHandle(this)->IsJSFunction();
 }
 
 
 bool Value::FullIsString() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsString()")) return false;
   bool result = Utils::OpenHandle(this)->IsString();
   ASSERT_EQ(result, QuickIsString());
   return result;
 }
 
 
 bool Value::IsSymbol() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsSymbol()")) return false;
   return Utils::OpenHandle(this)->IsSymbol();
 }
 
 
 bool Value::IsArray() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsArray()")) return false;
   return Utils::OpenHandle(this)->IsJSArray();
 }
 
 
 bool Value::IsArrayBuffer() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsArrayBuffer()"))
-    return false;
   return Utils::OpenHandle(this)->IsJSArrayBuffer();
 }
 
 
 bool Value::IsArrayBufferView() const {
   return Utils::OpenHandle(this)->IsJSArrayBufferView();
 }
 
 
 bool Value::IsTypedArray() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsArrayBuffer()"))
-    return false;
   return Utils::OpenHandle(this)->IsJSTypedArray();
 }
 
 
 #define TYPED_ARRAY_LIST(F) \
 F(Uint8Array, kExternalUnsignedByteArray) \
 F(Int8Array, kExternalByteArray) \
 F(Uint16Array, kExternalUnsignedShortArray) \
 F(Int16Array, kExternalShortArray) \
 F(Uint32Array, kExternalUnsignedIntArray) \
 F(Int32Array, kExternalIntArray) \
 F(Float32Array, kExternalFloatArray) \
 F(Float64Array, kExternalDoubleArray) \
 F(Uint8ClampedArray, kExternalPixelArray)
 
 
 #define VALUE_IS_TYPED_ARRAY(TypedArray, type_const)                          \
   bool Value::Is##TypedArray() const {                                        \
-    if (IsDeadCheck(i::Isolate::Current(), "v8::Value::Is" #TypedArray "()")) \
-      return false;                                                           \
     i::Handle<i::Object> obj = Utils::OpenHandle(this);                       \
     if (!obj->IsJSTypedArray()) return false;                                 \
     return i::JSTypedArray::cast(*obj)->type() == type_const;                 \
   }
 
 TYPED_ARRAY_LIST(VALUE_IS_TYPED_ARRAY)
 
 #undef VALUE_IS_TYPED_ARRAY
 
 
 bool Value::IsDataView() const {
   return Utils::OpenHandle(this)->IsJSDataView();
 }
 
 
 bool Value::IsObject() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsObject()")) return false;
   return Utils::OpenHandle(this)->IsJSObject();
 }
 
 
 bool Value::IsNumber() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsNumber()")) return false;
   return Utils::OpenHandle(this)->IsNumber();
 }
 
 
 bool Value::IsBoolean() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsBoolean()")) {
-    return false;
-  }
   return Utils::OpenHandle(this)->IsBoolean();
 }
 
 
 bool Value::IsExternal() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsExternal()")) {
-    return false;
-  }
   return Utils::OpenHandle(this)->IsExternal();
 }
 
 
 bool Value::IsInt32() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsInt32()")) return false;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsSmi()) return true;
   if (obj->IsNumber()) {
     double value = obj->Number();
     static const i::DoubleRepresentation minus_zero(-0.0);
     i::DoubleRepresentation rep(value);
     if (rep.bits == minus_zero.bits) {
       return false;
     }
     return i::FastI2D(i::FastD2I(value)) == value;
   }
   return false;
 }
 
 
 bool Value::IsUint32() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Value::IsUint32()")) return false;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsSmi()) return i::Smi::cast(*obj)->value() >= 0;
   if (obj->IsNumber()) {
     double value = obj->Number();
     static const i::DoubleRepresentation minus_zero(-0.0);
     i::DoubleRepresentation rep(value);
     if (rep.bits == minus_zero.bits) {
       return false;
     }
     return i::FastUI2D(i::FastD2UI(value)) == value;
   }
   return false;
 }
 
 
 bool Value::IsDate() const {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::IsDate()")) return false;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   return obj->HasSpecificClassOf(isolate->heap()->Date_string());
 }
 
 
 bool Value::IsStringObject() const {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::IsStringObject()")) return false;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   return obj->HasSpecificClassOf(isolate->heap()->String_string());
 }
 
 
 bool Value::IsSymbolObject() const {
   // TODO(svenpanne): these and other test functions should be written such
   // that they do not use Isolate::Current().
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::IsSymbolObject()")) return false;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   return obj->HasSpecificClassOf(isolate->heap()->Symbol_string());
 }
 
 
 bool Value::IsNumberObject() const {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::IsNumberObject()")) return false;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   return obj->HasSpecificClassOf(isolate->heap()->Number_string());
 }
 
 
 static i::Object* LookupBuiltin(i::Isolate* isolate,
                                 const char* builtin_name) {
   i::Handle<i::String> string =
       isolate->factory()->InternalizeUtf8String(builtin_name);
   i::Handle<i::JSBuiltinsObject> builtins = isolate->js_builtins_object();
   return builtins->GetPropertyNoExceptionThrown(*string);
 }
 
 
 static bool CheckConstructor(i::Isolate* isolate,
                              i::Handle<i::JSObject> obj,
                              const char* class_name) {
   i::Object* constr = obj->map()->constructor();
   if (!constr->IsJSFunction()) return false;
   i::JSFunction* func = i::JSFunction::cast(constr);
   return func->shared()->native() &&
          constr == LookupBuiltin(isolate, class_name);
 }
 
 
 bool Value::IsNativeError() const {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::IsNativeError()")) return false;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsJSObject()) {
     i::Handle<i::JSObject> js_obj(i::JSObject::cast(*obj));
     return CheckConstructor(isolate, js_obj, "$Error") ||
         CheckConstructor(isolate, js_obj, "$EvalError") ||
         CheckConstructor(isolate, js_obj, "$RangeError") ||
         CheckConstructor(isolate, js_obj, "$ReferenceError") ||
         CheckConstructor(isolate, js_obj, "$SyntaxError") ||
         CheckConstructor(isolate, js_obj, "$TypeError") ||
         CheckConstructor(isolate, js_obj, "$URIError");
   } else {
     return false;
   }
 }
 
 
 bool Value::IsBooleanObject() const {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Value::IsBooleanObject()")) return false;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   return obj->HasSpecificClassOf(isolate->heap()->Boolean_string());
 }
 
 
 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::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> str;
   if (obj->IsString()) {
     str = obj;
   } else {
     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(isolate, obj, &has_pending_exception);
     EXCEPTION_BAILOUT_CHECK(isolate, Local<String>());
   }
   return ToApiHandle<String>(str);
 }
 
 
 Local<String> Value::ToDetailString() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> str;
   if (obj->IsString()) {
     str = obj;
   } else {
     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(isolate, obj, &has_pending_exception);
     EXCEPTION_BAILOUT_CHECK(isolate, Local<String>());
   }
   return ToApiHandle<String>(str);
 }
 
 
 Local<v8::Object> Value::ToObject() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> val;
   if (obj->IsJSObject()) {
     val = obj;
   } else {
     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(isolate, obj, &has_pending_exception);
     EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Object>());
   }
   return ToApiHandle<Object>(val);
 }
 
 
 Local<Boolean> Value::ToBoolean() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsBoolean()) {
     return ToApiHandle<Boolean>(obj);
   } else {
     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 =
         isolate->factory()->ToBoolean(obj->BooleanValue());
     return ToApiHandle<Boolean>(val);
   }
 }
 
 
 Local<Number> Value::ToNumber() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsNumber()) {
     num = obj;
   } else {
     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(isolate, obj, &has_pending_exception);
     EXCEPTION_BAILOUT_CHECK(isolate, Local<Number>());
   }
   return ToApiHandle<Number>(num);
 }
 
 
 Local<Integer> Value::ToInteger() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsSmi()) {
     num = obj;
   } else {
     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(isolate, obj, &has_pending_exception);
     EXCEPTION_BAILOUT_CHECK(isolate, Local<Integer>());
   }
   return ToApiHandle<Integer>(num);
 }
 
 
 void i::Internals::CheckInitializedImpl(v8::Isolate* external_isolate) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(external_isolate);
   ApiCheck(isolate != NULL && isolate->IsInitialized() && !isolate->IsDead(),
            "v8::internal::Internals::CheckInitialized()",
            "Isolate is not initialized or V8 has died");
 }
 
 
 void External::CheckCast(v8::Value* that) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::External::Cast()")) return;
   ApiCheck(Utils::OpenHandle(that)->IsExternal(),
            "v8::External::Cast()",
            "Could not convert to external");
 }
 
 
 void v8::Object::CheckCast(Value* that) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Object::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsJSObject(),
            "v8::Object::Cast()",
            "Could not convert to object");
 }
 
 
 void v8::Function::CheckCast(Value* that) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Function::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsJSFunction(),
            "v8::Function::Cast()",
            "Could not convert to function");
 }
 
 
 void v8::String::CheckCast(v8::Value* that) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::String::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsString(),
            "v8::String::Cast()",
            "Could not convert to string");
 }
 
 
 void v8::Symbol::CheckCast(v8::Value* that) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Symbol::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsSymbol(),
            "v8::Symbol::Cast()",
            "Could not convert to symbol");
 }
 
 
 void v8::Number::CheckCast(v8::Value* that) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Number::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsNumber(),
            "v8::Number::Cast()",
            "Could not convert to number");
 }
 
 
 void v8::Integer::CheckCast(v8::Value* that) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Integer::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsNumber(),
            "v8::Integer::Cast()",
            "Could not convert to number");
 }
 
 
 void v8::Array::CheckCast(Value* that) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Array::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsJSArray(),
            "v8::Array::Cast()",
            "Could not convert to array");
 }
 
 
 void v8::ArrayBuffer::CheckCast(Value* that) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::ArrayBuffer::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsJSArrayBuffer(),
            "v8::ArrayBuffer::Cast()",
            "Could not convert to ArrayBuffer");
 }
 
 
 void v8::ArrayBufferView::CheckCast(Value* that) {
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsJSArrayBufferView(),
            "v8::ArrayBufferView::Cast()",
            "Could not convert to ArrayBufferView");
 }
 
 
 void v8::TypedArray::CheckCast(Value* that) {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::TypedArray::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsJSTypedArray(),
            "v8::TypedArray::Cast()",
            "Could not convert to TypedArray");
 }
 
 
 #define CHECK_TYPED_ARRAY_CAST(ApiClass, typeConst)                         \
   void v8::ApiClass::CheckCast(Value* that) {                               \
-    if (IsDeadCheck(i::Isolate::Current(), "v8::" #ApiClass "::Cast()"))    \
-      return;                                                               \
     i::Handle<i::Object> obj = Utils::OpenHandle(that);                     \
     ApiCheck(obj->IsJSTypedArray() &&                                       \
              i::JSTypedArray::cast(*obj)->type() == typeConst,              \
              "v8::" #ApiClass "::Cast()",                                   \
              "Could not convert to " #ApiClass);                            \
   }
 
 
 TYPED_ARRAY_LIST(CHECK_TYPED_ARRAY_CAST)
 
 #undef CHECK_TYPED_ARRAY_CAST
 
 
 void v8::DataView::CheckCast(Value* that) {
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsJSDataView(),
            "v8::DataView::Cast()",
            "Could not convert to DataView");
 }
 
 
 void v8::Date::CheckCast(v8::Value* that) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Date::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->HasSpecificClassOf(isolate->heap()->Date_string()),
            "v8::Date::Cast()",
            "Could not convert to date");
 }
 
 
 void v8::StringObject::CheckCast(v8::Value* that) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::StringObject::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->HasSpecificClassOf(isolate->heap()->String_string()),
            "v8::StringObject::Cast()",
            "Could not convert to StringObject");
 }
 
 
 void v8::SymbolObject::CheckCast(v8::Value* that) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::SymbolObject::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->HasSpecificClassOf(isolate->heap()->Symbol_string()),
            "v8::SymbolObject::Cast()",
            "Could not convert to SymbolObject");
 }
 
 
 void v8::NumberObject::CheckCast(v8::Value* that) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::NumberObject::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->HasSpecificClassOf(isolate->heap()->Number_string()),
            "v8::NumberObject::Cast()",
            "Could not convert to NumberObject");
 }
 
 
 void v8::BooleanObject::CheckCast(v8::Value* that) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::BooleanObject::Cast()")) return;
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->HasSpecificClassOf(isolate->heap()->Boolean_string()),
            "v8::BooleanObject::Cast()",
            "Could not convert to BooleanObject");
 }
 
 
 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 {
   return Utils::OpenHandle(this)->BooleanValue();
 }
 
 
 double Value::NumberValue() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsNumber()) {
     num = obj;
   } else {
     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(isolate, obj, &has_pending_exception);
     EXCEPTION_BAILOUT_CHECK(isolate, i::OS::nan_value());
   }
   return num->Number();
 }
 
 
 int64_t Value::IntegerValue() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsNumber()) {
     num = obj;
   } else {
     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(isolate, obj, &has_pending_exception);
     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::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsSmi()) {
     num = obj;
   } else {
     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(isolate, obj, &has_pending_exception);
     EXCEPTION_BAILOUT_CHECK(isolate, Local<Int32>());
   }
   return ToApiHandle<Int32>(num);
 }
 
 
 Local<Uint32> Value::ToUint32() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> num;
   if (obj->IsSmi()) {
     num = obj;
   } else {
     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(isolate, obj, &has_pending_exception);
     EXCEPTION_BAILOUT_CHECK(isolate, Local<Uint32>());
   }
   return ToApiHandle<Uint32>(num);
 }
 
 
 Local<Uint32> Value::ToArrayIndex() const {
   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>();
   }
   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(isolate, obj, &has_pending_exception);
   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), isolate);
     } else {
       value = isolate->factory()->NewNumber(index);
     }
     return Utils::Uint32ToLocal(value);
   }
   return Local<Uint32>();
 }
 
 
 int32_t Value::Int32Value() const {
   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(isolate);
     EXCEPTION_PREAMBLE(isolate);
     i::Handle<i::Object> num =
         i::Execution::ToInt32(isolate, obj, &has_pending_exception);
     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)) {
+  if (EmptyCheck("v8::Value::Equals()", this) ||
+      EmptyCheck("v8::Value::Equals()", that)) {
     return false;
   }
   LOG_API(isolate, "Equals");
   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::Handle<i::Object> args[] = { other };
   EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> result =
       CallV8HeapFunction("EQUALS", obj, ARRAY_SIZE(args), args,
                          &has_pending_exception);
   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)) {
+  if (EmptyCheck("v8::Value::StrictEquals()", this) ||
+      EmptyCheck("v8::Value::StrictEquals()", that)) {
     return false;
   }
   LOG_API(isolate, "StrictEquals");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> other = Utils::OpenHandle(*that);
   // Must check HeapNumber first, since NaN !== NaN.
   if (obj->IsHeapNumber()) {
     if (!other->IsNumber()) return false;
     double x = obj->Number();
     double y = other->Number();
@@ skipping 13 matching lines @@
   }
 }
 
 
 uint32_t Value::Uint32Value() const {
   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::Uint32Value()")) return 0;
     LOG_API(isolate, "Uint32Value");
     ENTER_V8(isolate);
     EXCEPTION_PREAMBLE(isolate);
     i::Handle<i::Object> num =
         i::Execution::ToUint32(isolate, obj, &has_pending_exception);
     EXCEPTION_BAILOUT_CHECK(isolate, 0);
     if (num->IsSmi()) {
       return i::Smi::cast(*num)->value();
     } else {
       return static_cast<uint32_t>(num->Number());
@@ skipping 1045 matching lines @@
 int Function::ScriptId() const {
   i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
   if (!func->shared()->script()->IsScript()) return v8::Script::kNoScriptId;
   i::Handle<i::Script> script(i::Script::cast(func->shared()->script()));
   return script->id()->value();
 }
 
 
 int String::Length() const {
   i::Handle<i::String> str = Utils::OpenHandle(this);
-  if (IsDeadCheck(str->GetIsolate(), "v8::String::Length()")) return 0;
   return str->length();
 }
 
 
 bool String::IsOneByte() const {
   i::Handle<i::String> str = Utils::OpenHandle(this);
-  if (IsDeadCheck(str->GetIsolate(), "v8::String::IsOneByte()")) {
-    return false;
-  }
   return str->HasOnlyOneByteChars();
 }
 
 
 // Helpers for ContainsOnlyOneByteHelper
 template<size_t size> struct OneByteMask;
 template<> struct OneByteMask<4> {
   static const uint32_t value = 0xFF00FF00;
 };
 template<> struct OneByteMask<8> {
@@ skipping 95 matching lines @@
     }
     return is_one_byte_;
   }
   bool is_one_byte_;
   DISALLOW_COPY_AND_ASSIGN(ContainsOnlyOneByteHelper);
 };
 
 
 bool String::ContainsOnlyOneByte() const {
   i::Handle<i::String> str = Utils::OpenHandle(this);
-  if (IsDeadCheck(str->GetIsolate(),
-                  "v8::String::ContainsOnlyOneByte()")) {
-    return false;
-  }
   if (str->HasOnlyOneByteChars()) return true;
   ContainsOnlyOneByteHelper helper;
   return helper.Check(*str);
 }
 
 
 class Utf8LengthHelper : public i::AllStatic {
  public:
   enum State {
     kEndsWithLeadingSurrogate = 1 << 0,
@@ skipping 183 matching lines @@
   i::ConsString* cons_string =
       Utf8LengthHelper::Visitor::VisitFlat(str, &length, &state);
   if (cons_string == NULL) return length;
   return Utf8LengthHelper::Calculate(cons_string);
 }
 
 
 int String::Utf8Length() const {
   i::Handle<i::String> str = Utils::OpenHandle(this);
   i::Isolate* isolate = str->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::String::Utf8Length()")) return 0;
   return v8::Utf8Length(*str, isolate);
 }
 
 
 class Utf8WriterVisitor {
  public:
   Utf8WriterVisitor(
       char* buffer, int capacity, bool skip_capacity_check)
     : early_termination_(false),
       last_character_(unibrow::Utf16::kNoPreviousCharacter),
@@ skipping 165 matching lines @@
   }
   return true;
 }
 
 
 int String::WriteUtf8(char* buffer,
                       int capacity,
                       int* nchars_ref,
                       int options) const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::String::WriteUtf8()")) return 0;
   LOG_API(isolate, "String::WriteUtf8");
   ENTER_V8(isolate);
   i::Handle<i::String> str = Utils::OpenHandle(this);
   if (options & HINT_MANY_WRITES_EXPECTED) {
     FlattenString(str);  // Flatten the string for efficiency.
   }
   const int string_length = str->length();
   bool write_null = !(options & NO_NULL_TERMINATION);
   // First check if we can just write the string without checking capacity.
   if (capacity == -1 || capacity / 3 >= string_length) {
@@ skipping 29 matching lines @@
   i::String::VisitFlat(&writer, *str);
   return writer.CompleteWrite(write_null, nchars_ref);
 }
 
 
 int String::WriteAscii(char* buffer,
                        int start,
                        int length,
                        int options) const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::String::WriteAscii()")) return 0;
   LOG_API(isolate, "String::WriteAscii");
   ENTER_V8(isolate);
   ASSERT(start >= 0 && length >= -1);
   i::Handle<i::String> str = Utils::OpenHandle(this);
   isolate->string_tracker()->RecordWrite(str);
   if (options & HINT_MANY_WRITES_EXPECTED) {
     FlattenString(str);  // Flatten the string for efficiency.
   }
 
   int end = length;
@@ skipping 15 matching lines @@
 }
 
 
 template<typename CharType>
 static inline int WriteHelper(const String* string,
                               CharType* buffer,
                               int start,
                               int length,
                               int options) {
   i::Isolate* isolate = Utils::OpenHandle(string)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::String::Write()")) return 0;
   LOG_API(isolate, "String::Write");
   ENTER_V8(isolate);
   ASSERT(start >= 0 && length >= -1);
   i::Handle<i::String> str = Utils::OpenHandle(string);
   isolate->string_tracker()->RecordWrite(str);
   if (options & String::HINT_MANY_WRITES_EXPECTED) {
     // Flatten the string for efficiency.  This applies whether we are
     // using StringCharacterStream or Get(i) to access the characters.
     FlattenString(str);
   }
@@ skipping 21 matching lines @@
 int String::Write(uint16_t* buffer,
                   int start,
                   int length,
                   int options) const {
   return WriteHelper(this, buffer, start, length, options);
 }
 
 
 bool v8::String::IsExternal() const {
   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 {
   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);
   const v8::String::ExternalStringResource* expected;
   if (i::StringShape(*str).IsExternalTwoByte()) {
     const void* resource =
@@ skipping 25 matching lines @@
     expectedEncoding = str->IsOneByteRepresentation() ? ASCII_ENCODING
                                                     : TWO_BYTE_ENCODING;
   }
   CHECK_EQ(expected, value);
   CHECK_EQ(expectedEncoding, encoding);
 }
 
 const v8::String::ExternalAsciiStringResource*
       v8::String::GetExternalAsciiStringResource() const {
   i::Handle<i::String> str = Utils::OpenHandle(this);
-  if (IsDeadCheck(str->GetIsolate(),
-                  "v8::String::GetExternalAsciiStringResource()")) {
-    return NULL;
-  }
   if (i::StringShape(*str).IsExternalAscii()) {
     const void* resource =
         i::Handle<i::ExternalAsciiString>::cast(str)->resource();
     return reinterpret_cast<const ExternalAsciiStringResource*>(resource);
   } else {
     return NULL;
   }
 }
 
 
 Local<Value> Symbol::Name() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Symbol::Name()"))
-    return Local<Value>();
   i::Handle<i::Symbol> sym = Utils::OpenHandle(this);
   i::Handle<i::Object> name(sym->name(), sym->GetIsolate());
   return Utils::ToLocal(name);
 }
 
 
 double Number::Value() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Number::Value()")) return 0;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   return obj->Number();
 }
 
 
 bool Boolean::Value() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Boolean::Value()")) return false;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   return obj->IsTrue();
 }
 
 
 int64_t Integer::Value() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Integer::Value()")) return 0;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsSmi()) {
     return i::Smi::cast(*obj)->value();
   } else {
     return static_cast<int64_t>(obj->Number());
   }
 }
 
 
 int32_t Int32::Value() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Int32::Value()")) return 0;
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsSmi()) {
     return i::Smi::cast(*obj)->value();
   } else {
     return static_cast<int32_t>(obj->Number());
   }
 }
 
 
 uint32_t Uint32::Value() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Uint32::Value()")) return 0;
   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() {
   i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
-  if (IsDeadCheck(obj->GetIsolate(), "v8::Object::InternalFieldCount()")) {
-    return 0;
-  }
   return obj->GetInternalFieldCount();
 }
 
 
 static bool InternalFieldOK(i::Handle<i::JSObject> obj,
                             int index,
                             const char* location) {
-  return !IsDeadCheck(obj->GetIsolate(), location) &&
-      ApiCheck(index < obj->GetInternalFieldCount(),
-               location,
-               "Internal field out of bounds");
+  return ApiCheck(index < obj->GetInternalFieldCount(),
+                  location,
+                  "Internal field out of bounds");
 }
 
 
 Local<Value> v8::Object::SlowGetInternalField(int index) {
   i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
   const char* location = "v8::Object::GetInternalField()";
   if (!InternalFieldOK(obj, index, location)) return Local<Value>();
   i::Handle<i::Object> value(obj->GetInternalField(index), obj->GetIsolate());
   return Utils::ToLocal(value);
 }
@@ skipping 133 matching lines @@
     heap_statistics->heap_size_limit_ = 0;
     return;
   }
   Isolate* ext_isolate = reinterpret_cast<Isolate*>(isolate);
   return ext_isolate->GetHeapStatistics(heap_statistics);
 }
 
 
 void v8::V8::VisitExternalResources(ExternalResourceVisitor* visitor) {
   i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::V8::VisitExternalResources");
   isolate->heap()->VisitExternalResources(visitor);
 }
 
 
 class VisitorAdapter : public i::ObjectVisitor {
  public:
   explicit VisitorAdapter(PersistentHandleVisitor* visitor)
       : visitor_(visitor) {}
   virtual void VisitPointers(i::Object** start, i::Object** end) {
     UNREACHABLE();
   }
   virtual void VisitEmbedderReference(i::Object** p, uint16_t class_id) {
     Value* value = ToApi<Value>(i::Handle<i::Object>(p));
     visitor_->VisitPersistentHandle(
         reinterpret_cast<Persistent<Value>*>(&value), class_id);
   }
  private:
   PersistentHandleVisitor* visitor_;
 };
 
 
 void v8::V8::VisitHandlesWithClassIds(PersistentHandleVisitor* visitor) {
   i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::V8::VisitHandlesWithClassId");
-
   i::DisallowHeapAllocation no_allocation;
 
   VisitorAdapter visitor_adapter(visitor);
   isolate->global_handles()->IterateAllRootsWithClassIds(&visitor_adapter);
 }
 
 
 void v8::V8::VisitHandlesForPartialDependence(
     Isolate* exported_isolate, PersistentHandleVisitor* visitor) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(exported_isolate);
   ASSERT(isolate == i::Isolate::Current());
-  IsDeadCheck(isolate, "v8::V8::VisitHandlesForPartialDependence");
-
   i::DisallowHeapAllocation no_allocation;
 
   VisitorAdapter visitor_adapter(visitor);
   isolate->global_handles()->IterateAllRootsInNewSpaceWithClassIds(
       &visitor_adapter);
 }
 
 
 bool v8::V8::IdleNotification(int hint) {
   // Returning true tells the caller that it need not
@@ skipping 104 matching lines @@
   i::HandleScope scope(isolate);
   i::Handle<i::Context> env =
       CreateEnvironment(isolate, extensions, global_template, global_object);
   if (env.is_null()) return Local<Context>();
   return Utils::ToLocal(scope.CloseAndEscape(env));
 }
 
 
 void v8::Context::SetSecurityToken(Handle<Value> token) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Context::SetSecurityToken()")) {
-    return;
-  }
   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() {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate,
-                  "v8::Context::UseDefaultSecurityToken()")) {
-    return;
-  }
   ENTER_V8(isolate);
   i::Handle<i::Context> env = Utils::OpenHandle(this);
   env->set_security_token(env->global_object());
 }
 
 
 Handle<Value> 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, isolate);
   return Utils::ToLocal(token_handle);
 }
 
 
 bool Context::HasOutOfMemoryException() {
   i::Handle<i::Context> env = Utils::OpenHandle(this);
   return env->has_out_of_memory();
 }
 
 
 bool Context::InContext() {
   return i::Isolate::Current()->context() != NULL;
 }
 
 
 v8::Isolate* Context::GetIsolate() {
   i::Handle<i::Context> env = Utils::OpenHandle(this);
   return reinterpret_cast<Isolate*>(env->GetIsolate());
 }
 
 
 v8::Local<v8::Context> Context::GetEntered() {
   i::Isolate* isolate = i::Isolate::Current();
   if (!EnsureInitializedForIsolate(isolate, "v8::Context::GetEntered()")) {
     return Local<Context>();
   }
-  i::Handle<i::Object> last =
-      isolate->handle_scope_implementer()->LastEnteredContext();
-  if (last.is_null()) return Local<Context>();
-  i::Handle<i::Context> context = i::Handle<i::Context>::cast(last);
-  return Utils::ToLocal(context);
+  return reinterpret_cast<Isolate*>(isolate)->GetEnteredContext();
 }
 
 
 v8::Local<v8::Context> Context::GetCurrent() {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Context::GetCurrent()")) {
-    return Local<Context>();
-  }
   return reinterpret_cast<Isolate*>(isolate)->GetCurrentContext();
 }
 
 
 v8::Local<v8::Context> Context::GetCalling() {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Context::GetCalling()")) {
-    return Local<Context>();
-  }
-  i::Handle<i::Object> calling =
-      isolate->GetCallingNativeContext();
-  if (calling.is_null()) return Local<Context>();
-  i::Handle<i::Context> context = i::Handle<i::Context>::cast(calling);
-  return Utils::ToLocal(context);
+  return reinterpret_cast<Isolate*>(isolate)->GetCallingContext();
 }
 
 
 v8::Local<v8::Object> Context::Global() {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Context::Global()")) {
-    return Local<v8::Object>();
-  }
-  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::Context> context = Utils::OpenHandle(this);
+  i::Isolate* isolate = context->GetIsolate();
   i::Handle<i::Object> global(context->global_proxy(), isolate);
   return Utils::ToLocal(i::Handle<i::JSObject>::cast(global));
 }
 
 
 void Context::DetachGlobal() {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Context::DetachGlobal()")) return;
+  i::Handle<i::Context> context = Utils::OpenHandle(this);
+  i::Isolate* isolate = context->GetIsolate();
   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()->DetachGlobal(context);
 }
 
 
 void Context::ReattachGlobal(Handle<Object> global_object) {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Context::ReattachGlobal()")) return;
+  i::Handle<i::Context> context = Utils::OpenHandle(this);
+  i::Isolate* isolate = context->GetIsolate();
   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::Handle<i::JSGlobalProxy> global_proxy =
       i::Handle<i::JSGlobalProxy>::cast(Utils::OpenHandle(*global_object));
   isolate->bootstrapper()->ReattachGlobal(context, global_proxy);
 }
 
 
 void Context::AllowCodeGenerationFromStrings(bool allow) {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::Context::AllowCodeGenerationFromStrings()")) {
-    return;
-  }
+  i::Handle<i::Context> context = Utils::OpenHandle(this);
+  i::Isolate* isolate = context->GetIsolate();
   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));
   context->set_allow_code_gen_from_strings(
       allow ? isolate->heap()->true_value() : isolate->heap()->false_value());
 }
 
 
 bool Context::IsCodeGenerationFromStringsAllowed() {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate,
-                  "v8::Context::IsCodeGenerationFromStringsAllowed()")) {
-    return false;
-  }
-  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::Handle<i::Context> context = Utils::OpenHandle(this);
   return !context->allow_code_gen_from_strings()->IsFalse();
 }
 
 
 void Context::SetErrorMessageForCodeGenerationFromStrings(
     Handle<String> error) {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate,
-      "v8::Context::SetErrorMessageForCodeGenerationFromStrings()")) {
-    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::Handle<i::Context> context = Utils::OpenHandle(this);
   i::Handle<i::String> error_handle = Utils::OpenHandle(*error);
   context->set_error_message_for_code_gen_from_strings(*error_handle);
 }
 
 
 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");
@@ skipping 35 matching lines @@
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::External::New()");
   LOG_API(isolate, "External::New");
   ENTER_V8(isolate);
   i::Handle<i::JSObject> external = isolate->factory()->NewExternal(value);
   return Utils::ExternalToLocal(external);
 }
 
 
 void* External::Value() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::External::Value()")) return NULL;
   return ExternalValue(*Utils::OpenHandle(this));
 }
 
 
 Local<String> v8::String::Empty() {
   i::Isolate* isolate = i::Isolate::Current();
   if (!EnsureInitializedForIsolate(isolate, "v8::String::Empty()")) {
     return v8::Local<String>();
   }
   LOG_API(isolate, "String::Empty()");
@@ skipping 172 matching lines @@
   CHECK(resource && resource->data());
   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 (i::StringShape(*obj).IsExternalTwoByte()) {
     return false;  // Already an external string.
   }
   ENTER_V8(isolate);
   if (isolate->string_tracker()->IsFreshUnusedString(obj)) {
     return false;
   }
   if (isolate->heap()->IsInGCPostProcessing()) {
     return false;
   }
@@ skipping 30 matching lines @@
   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 (i::StringShape(*obj).IsExternalTwoByte()) {
     return false;  // Already an external string.
   }
   ENTER_V8(isolate);
   if (isolate->string_tracker()->IsFreshUnusedString(obj)) {
     return false;
   }
   if (isolate->heap()->IsInGCPostProcessing()) {
     return false;
   }
@@ skipping 17 matching lines @@
     isolate->heap()->external_string_table()->AddString(*external);
   }
   return result;
 }
 
 
 bool v8::String::CanMakeExternal() {
   if (!internal::FLAG_clever_optimizations) return false;
   i::Handle<i::String> obj = Utils::OpenHandle(this);
   i::Isolate* isolate = obj->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::String::CanMakeExternal()")) return false;
   if (isolate->string_tracker()->IsFreshUnusedString(obj)) return false;
   int size = obj->Size();  // Byte size of the original string.
   if (size < i::ExternalString::kShortSize) return false;
   i::StringShape shape(*obj);
   return !shape.IsExternal();
 }
 
 
 Local<v8::Object> v8::Object::New() {
   i::Isolate* isolate = i::Isolate::Current();
@@ skipping 12 matching lines @@
   LOG_API(isolate, "NumberObject::New");
   ENTER_V8(isolate);
   i::Handle<i::Object> number = isolate->factory()->NewNumber(value);
   i::Handle<i::Object> obj = isolate->factory()->ToObject(number);
   return Utils::ToLocal(obj);
 }
 
 
 double v8::NumberObject::ValueOf() const {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::NumberObject::NumberValue()")) return 0;
   LOG_API(isolate, "NumberObject::NumberValue");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
   return jsvalue->value()->Number();
 }
 
 
 Local<v8::Value> v8::BooleanObject::New(bool value) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::BooleanObject::New()");
   LOG_API(isolate, "BooleanObject::New");
   ENTER_V8(isolate);
   i::Handle<i::Object> boolean(value
                                ? isolate->heap()->true_value()
                                : isolate->heap()->false_value(),
                                isolate);
   i::Handle<i::Object> obj = isolate->factory()->ToObject(boolean);
   return Utils::ToLocal(obj);
 }
 
 
 bool v8::BooleanObject::ValueOf() const {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::BooleanObject::BooleanValue()")) return 0;
   LOG_API(isolate, "BooleanObject::BooleanValue");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
   return jsvalue->value()->IsTrue();
 }
 
 
 Local<v8::Value> v8::StringObject::New(Handle<String> value) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::StringObject::New()");
   LOG_API(isolate, "StringObject::New");
   ENTER_V8(isolate);
   i::Handle<i::Object> obj =
       isolate->factory()->ToObject(Utils::OpenHandle(*value));
   return Utils::ToLocal(obj);
 }
 
 
 Local<v8::String> v8::StringObject::ValueOf() const {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::StringObject::StringValue()")) {
-    return Local<v8::String>();
-  }
   LOG_API(isolate, "StringObject::StringValue");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
   return Utils::ToLocal(
       i::Handle<i::String>(i::String::cast(jsvalue->value())));
 }
 
 
 Local<v8::Value> v8::SymbolObject::New(Isolate* isolate, Handle<Symbol> value) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   EnsureInitializedForIsolate(i_isolate, "v8::SymbolObject::New()");
   LOG_API(i_isolate, "SymbolObject::New");
   ENTER_V8(i_isolate);
   i::Handle<i::Object> obj =
       i_isolate->factory()->ToObject(Utils::OpenHandle(*value));
   return Utils::ToLocal(obj);
 }
 
 
 Local<v8::Symbol> v8::SymbolObject::ValueOf() const {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::SymbolObject::SymbolValue()"))
-    return Local<v8::Symbol>();
   LOG_API(isolate, "SymbolObject::SymbolValue");
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
   return Utils::ToLocal(
       i::Handle<i::Symbol>(i::Symbol::cast(jsvalue->value())));
 }
 
 
 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 (std::isnan(time)) {
     // Introduce only canonical NaN value into the VM, to avoid signaling NaNs.
     time = i::OS::nan_value();
   }
   ENTER_V8(isolate);
   EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> obj =
       i::Execution::NewDate(isolate, time, &has_pending_exception);
   EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Value>());
   return Utils::ToLocal(obj);
 }
 
 
 double v8::Date::ValueOf() 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::JSDate> jsdate = i::Handle<i::JSDate>::cast(obj);
   return jsdate->value()->Number();
 }
 
 
 void v8::Date::DateTimeConfigurationChangeNotification() {
   i::Isolate* isolate = i::Isolate::Current();
   ON_BAILOUT(isolate, "v8::Date::DateTimeConfigurationChangeNotification()",
@@ skipping 53 matching lines @@
   i::Handle<i::JSRegExp> obj = i::Execution::NewJSRegExp(
       Utils::OpenHandle(*pattern),
       RegExpFlagsToString(flags),
       &has_pending_exception);
   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 = 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)        \
   STATIC_ASSERT(static_cast<int>(v8::RegExp::api_flag) ==     \
                 static_cast<int>(i::JSRegExp::internal_flag))
 REGEXP_FLAG_ASSERT_EQ(kNone, NONE);
 REGEXP_FLAG_ASSERT_EQ(kGlobal, GLOBAL);
 REGEXP_FLAG_ASSERT_EQ(kIgnoreCase, IGNORE_CASE);
 REGEXP_FLAG_ASSERT_EQ(kMultiline, MULTILINE);
 #undef REGEXP_FLAG_ASSERT_EQ
 
 v8::RegExp::Flags v8::RegExp::GetFlags() const {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::RegExp::GetFlags()")) {
-    return v8::RegExp::kNone;
-  }
   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(isolate);
   int real_length = length > 0 ? length : 0;
   i::Handle<i::JSArray> obj = isolate->factory()->NewJSArray(real_length);
   i::Handle<i::Object> length_obj =
       isolate->factory()->NewNumberFromInt(real_length);
   obj->set_length(*length_obj);
   return Utils::ToLocal(obj);
 }
 
 
 uint32_t v8::Array::Length() const {
-  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());
   }
 }
 
 
@@ skipping 57 matching lines @@
     } else {
       UNREACHABLE();
     }
     view_obj = i::handle(view->weak_next(), isolate);
   }
   obj->Neuter();
 }
 
 
 size_t v8::ArrayBuffer::ByteLength() const {
-  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::ArrayBuffer::ByteLength()")) return 0;
   i::Handle<i::JSArrayBuffer> obj = Utils::OpenHandle(this);
   return static_cast<size_t>(obj->byte_length()->Number());
 }
 
 
 Local<ArrayBuffer> v8::ArrayBuffer::New(size_t byte_length) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::ArrayBuffer::New(size_t)");
   LOG_API(isolate, "v8::ArrayBuffer::New(size_t)");
   ENTER_V8(isolate);
@@ skipping 39 matching lines @@
 void* v8::ArrayBufferView::BaseAddress() {
   i::Handle<i::JSArrayBufferView> obj = Utils::OpenHandle(this);
   i::Handle<i::JSArrayBuffer> buffer(i::JSArrayBuffer::cast(obj->buffer()));
   void* buffer_data = buffer->backing_store();
   size_t byte_offset = static_cast<size_t>(obj->byte_offset()->Number());
   return static_cast<uint8_t*>(buffer_data) + byte_offset;
 }
 
 
 size_t v8::TypedArray::Length() {
-  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::TypedArray::Length()")) return 0;
   i::Handle<i::JSTypedArray> obj = Utils::OpenHandle(this);
   return static_cast<size_t>(obj->length()->Number());
 }
 
 
 static inline void SetupArrayBufferView(
     i::Isolate* isolate,
     i::Handle<i::JSArrayBufferView> obj,
     i::Handle<i::JSArrayBuffer> buffer,
     size_t byte_offset,
@@ skipping 237 matching lines @@
       StackTrace::StackTraceOptions options) {
   i::Isolate::Current()->SetCaptureStackTraceForUncaughtExceptions(
       capture,
       frame_limit,
       options);
 }
 
 
 void V8::SetCounterFunction(CounterLookupCallback callback) {
   i::Isolate* isolate = EnterIsolateIfNeeded();
-  if (IsDeadCheck(isolate, "v8::V8::SetCounterFunction()")) return;
   isolate->stats_table()->SetCounterFunction(callback);
 }
 
 
 void V8::SetCreateHistogramFunction(CreateHistogramCallback callback) {
   i::Isolate* isolate = EnterIsolateIfNeeded();
-  if (IsDeadCheck(isolate, "v8::V8::SetCreateHistogramFunction()")) return;
   isolate->stats_table()->SetCreateHistogramFunction(callback);
   isolate->InitializeLoggingAndCounters();
   isolate->counters()->ResetHistograms();
 }
 
 
 void V8::SetAddHistogramSampleFunction(AddHistogramSampleCallback callback) {
   i::Isolate* isolate = EnterIsolateIfNeeded();
-  if (IsDeadCheck(isolate, "v8::V8::SetAddHistogramSampleFunction()")) return;
   isolate->stats_table()->
       SetAddHistogramSampleFunction(callback);
 }
 
 void V8::SetFailedAccessCheckCallbackFunction(
       FailedAccessCheckCallback callback) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::V8::SetFailedAccessCheckCallbackFunction()")) {
-    return;
-  }
   isolate->SetFailedAccessCheckCallback(callback);
 }
 
 
 intptr_t Isolate::AdjustAmountOfExternalAllocatedMemory(
     intptr_t change_in_bytes) {
   i::Heap* heap = reinterpret_cast<i::Isolate*>(this)->heap();
   return heap->AdjustAmountOfExternalAllocatedMemory(change_in_bytes);
 }
 
 
 intptr_t V8::AdjustAmountOfExternalAllocatedMemory(intptr_t change_in_bytes) {
   i::Isolate* isolate = i::Isolate::UncheckedCurrent();
-  if (isolate == NULL || !isolate->IsInitialized() ||
-      IsDeadCheck(isolate, "v8::V8::AdjustAmountOfExternalAllocatedMemory()")) {
+  if (isolate == NULL || !isolate->IsInitialized()) {
     return 0;
   }
   Isolate* isolate_ext = reinterpret_cast<Isolate*>(isolate);
   return isolate_ext->AdjustAmountOfExternalAllocatedMemory(change_in_bytes);
 }
 
 
 HeapProfiler* Isolate::GetHeapProfiler() {
   i::HeapProfiler* heap_profiler =
       reinterpret_cast<i::Isolate*>(this)->heap_profiler();
   return reinterpret_cast<HeapProfiler*>(heap_profiler);
 }
 
 
 CpuProfiler* Isolate::GetCpuProfiler() {
   i::CpuProfiler* cpu_profiler =
       reinterpret_cast<i::Isolate*>(this)->cpu_profiler();
   return reinterpret_cast<CpuProfiler*>(cpu_profiler);
 }
 
 
+bool Isolate::InContext() {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  return isolate->context() != NULL;
+}
+
+
 v8::Local<v8::Context> Isolate::GetCurrentContext() {
-  i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(this);
-  i::Context* context = internal_isolate->context();
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  i::Context* context = isolate->context();
   if (context == NULL) return Local<Context>();
   i::Context* native_context = context->global_object()->native_context();
   if (native_context == NULL) return Local<Context>();
   return Utils::ToLocal(i::Handle<i::Context>(native_context));
 }
 
 
+v8::Local<v8::Context> Isolate::GetCallingContext() {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  i::Handle<i::Object> calling = isolate->GetCallingNativeContext();
+  if (calling.is_null()) return Local<Context>();
+  return Utils::ToLocal(i::Handle<i::Context>::cast(calling));
+}
+
+
+v8::Local<v8::Context> Isolate::GetEnteredContext() {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  i::Handle<i::Object> last =
+      isolate->handle_scope_implementer()->LastEnteredContext();
+  if (last.is_null()) return Local<Context>();
+  return Utils::ToLocal(i::Handle<i::Context>::cast(last));
+}
+
+
 void Isolate::SetObjectGroupId(const Persistent<Value>& object,
                                UniqueId id) {
   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(this);
   internal_isolate->global_handles()->SetObjectGroupId(
       Utils::OpenPersistent(object).location(),
       id);
 }
 
 
 void Isolate::SetReferenceFromGroup(UniqueId id,
@@ skipping 36 matching lines @@
 
 
 void Isolate::RemoveGCEpilogueCallback(GCEpilogueCallback callback) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   isolate->heap()->RemoveGCEpilogueCallback(callback);
 }
 
 
 void V8::AddGCPrologueCallback(GCPrologueCallback callback, GCType gc_type) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::V8::AddGCPrologueCallback()")) return;
   isolate->heap()->AddGCPrologueCallback(
       reinterpret_cast<v8::Isolate::GCPrologueCallback>(callback),
       gc_type,
       false);
 }
 
 
 void V8::RemoveGCPrologueCallback(GCPrologueCallback callback) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::V8::RemoveGCPrologueCallback()")) return;
   isolate->heap()->RemoveGCPrologueCallback(
       reinterpret_cast<v8::Isolate::GCPrologueCallback>(callback));
 }
 
 
 void V8::AddGCEpilogueCallback(GCEpilogueCallback callback, GCType gc_type) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::V8::AddGCEpilogueCallback()")) return;
   isolate->heap()->AddGCEpilogueCallback(
       reinterpret_cast<v8::Isolate::GCEpilogueCallback>(callback),
       gc_type,
       false);
 }
 
 
 void V8::RemoveGCEpilogueCallback(GCEpilogueCallback callback) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::V8::RemoveGCEpilogueCallback()")) return;
   isolate->heap()->RemoveGCEpilogueCallback(
       reinterpret_cast<v8::Isolate::GCEpilogueCallback>(callback));
 }
 
 
 void V8::AddMemoryAllocationCallback(MemoryAllocationCallback callback,
                                      ObjectSpace space,
                                      AllocationAction action) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::V8::AddMemoryAllocationCallback()")) return;
   isolate->memory_allocator()->AddMemoryAllocationCallback(
       callback, space, action);
 }
 
 
 void V8::RemoveMemoryAllocationCallback(MemoryAllocationCallback callback) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::V8::RemoveMemoryAllocationCallback()")) return;
   isolate->memory_allocator()->RemoveMemoryAllocationCallback(
       callback);
 }
 
 
 void V8::AddCallCompletedCallback(CallCompletedCallback callback) {
   if (callback == NULL) return;
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::V8::AddLeaveScriptCallback()")) return;
   i::V8::AddCallCompletedCallback(callback);
 }
 
 
 void V8::RemoveCallCompletedCallback(CallCompletedCallback callback) {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::V8::RemoveLeaveScriptCallback()")) return;
   i::V8::RemoveCallCompletedCallback(callback);
 }
 
 
 void V8::TerminateExecution(Isolate* isolate) {
   // If no isolate is supplied, use the default isolate.
   if (isolate != NULL) {
     reinterpret_cast<i::Isolate*>(isolate)->stack_guard()->TerminateExecution();
   } else {
     i::Isolate::GetDefaultIsolateStackGuard()->TerminateExecution();
@@ skipping 65 matching lines @@
       heap->CommittedMemoryExecutable();
   heap_statistics->total_physical_size_ = heap->CommittedPhysicalMemory();
   heap_statistics->used_heap_size_ = heap->SizeOfObjects();
   heap_statistics->heap_size_limit_ = heap->MaxReserved();
 }
 
 
 String::Utf8Value::Utf8Value(v8::Handle<v8::Value> obj)
     : str_(NULL), length_(0) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::String::Utf8Value::Utf8Value()")) return;
   if (obj.IsEmpty()) return;
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   TryCatch try_catch;
   Handle<String> str = obj->ToString();
   if (str.IsEmpty()) return;
   i::Handle<i::String> i_str = Utils::OpenHandle(*str);
   length_ = v8::Utf8Length(*i_str, isolate);
   str_ = i::NewArray<char>(length_ + 1);
   str->WriteUtf8(str_);
 }
 
 
 String::Utf8Value::~Utf8Value() {
   i::DeleteArray(str_);
 }
 
 
 String::AsciiValue::AsciiValue(v8::Handle<v8::Value> obj)
     : str_(NULL), length_(0) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::String::AsciiValue::AsciiValue()")) return;
   if (obj.IsEmpty()) return;
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   TryCatch try_catch;
   Handle<String> str = obj->ToString();
   if (str.IsEmpty()) return;
   length_ = str->Utf8Length();
   str_ = i::NewArray<char>(length_ + 1);
   str->WriteUtf8(str_);
   ASSERT(i::String::NonAsciiStart(str_, length_) >= length_);
 }
 
 
 String::AsciiValue::~AsciiValue() {
   i::DeleteArray(str_);
 }
 
 
 String::Value::Value(v8::Handle<v8::Value> obj)
     : str_(NULL), length_(0) {
   i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::String::Value::Value()")) return;
   if (obj.IsEmpty()) return;
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   TryCatch try_catch;
   Handle<String> str = obj->ToString();
   if (str.IsEmpty()) return;
   length_ = str->Length();
   str_ = i::NewArray<uint16_t>(length_ + 1);
   str->Write(str_);
 }
@@ skipping 289 matching lines @@
   }
   debugger->set_live_edit_enabled(enable);
 }
 
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 Handle<String> CpuProfileNode::GetFunctionName() const {
   i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::CpuProfileNode::GetFunctionName");
   const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
   const i::CodeEntry* entry = node->entry();
   if (!entry->has_name_prefix()) {
     return ToApiHandle<String>(
         isolate->factory()->InternalizeUtf8String(entry->name()));
   } else {
     return ToApiHandle<String>(isolate->factory()->NewConsString(
         isolate->factory()->InternalizeUtf8String(entry->name_prefix()),
         isolate->factory()->InternalizeUtf8String(entry->name())));
   }
 }
 
 
 int CpuProfileNode::GetScriptId() const {
   const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
   const i::CodeEntry* entry = node->entry();
   return entry->script_id();
 }
 
 
 Handle<String> CpuProfileNode::GetScriptResourceName() const {
   i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::CpuProfileNode::GetScriptResourceName");
   const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
   return ToApiHandle<String>(isolate->factory()->InternalizeUtf8String(
       node->entry()->resource_name()));
 }
 
 
 int CpuProfileNode::GetLineNumber() const {
   return reinterpret_cast<const i::ProfileNode*>(this)->entry()->line_number();
 }
 
 
 const char* CpuProfileNode::GetBailoutReason() const {
   const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
   return node->entry()->bailout_reason();
 }
 
 
 double CpuProfileNode::GetSelfSamplesCount() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::CpuProfileNode::GetSelfSamplesCount");
   return reinterpret_cast<const i::ProfileNode*>(this)->self_ticks();
 }
 
 
 unsigned CpuProfileNode::GetHitCount() const {
   return reinterpret_cast<const i::ProfileNode*>(this)->self_ticks();
 }
 
 
 unsigned CpuProfileNode::GetCallUid() const {
@@ skipping 13 matching lines @@
 
 const CpuProfileNode* CpuProfileNode::GetChild(int index) const {
   const i::ProfileNode* child =
       reinterpret_cast<const i::ProfileNode*>(this)->children()->at(index);
   return reinterpret_cast<const CpuProfileNode*>(child);
 }
 
 
 void CpuProfile::Delete() {
   i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::CpuProfile::Delete");
   i::CpuProfiler* profiler = isolate->cpu_profiler();
   ASSERT(profiler != NULL);
   profiler->DeleteProfile(reinterpret_cast<i::CpuProfile*>(this));
   if (profiler->GetProfilesCount() == 0) {
     // If this was the last profile, clean up all accessory data as well.
     profiler->DeleteAllProfiles();
   }
 }
 
 
 unsigned CpuProfile::GetUid() const {
   return reinterpret_cast<const i::CpuProfile*>(this)->uid();
 }
 
 
 Handle<String> CpuProfile::GetTitle() const {
   i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::CpuProfile::GetTitle");
   const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
   return ToApiHandle<String>(isolate->factory()->InternalizeUtf8String(
       profile->title()));
 }
 
 
 const CpuProfileNode* CpuProfile::GetTopDownRoot() const {
   const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
   return reinterpret_cast<const CpuProfileNode*>(profile->top_down()->root());
 }
@@ skipping 71 matching lines @@
 }
 
 
 static i::HeapGraphEdge* ToInternal(const HeapGraphEdge* edge) {
   return const_cast<i::HeapGraphEdge*>(
       reinterpret_cast<const i::HeapGraphEdge*>(edge));
 }
 
 
 HeapGraphEdge::Type HeapGraphEdge::GetType() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapGraphEdge::GetType");
   return static_cast<HeapGraphEdge::Type>(ToInternal(this)->type());
 }
 
 
 Handle<Value> HeapGraphEdge::GetName() const {
   i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapGraphEdge::GetName");
   i::HeapGraphEdge* edge = ToInternal(this);
   switch (edge->type()) {
     case i::HeapGraphEdge::kContextVariable:
     case i::HeapGraphEdge::kInternal:
     case i::HeapGraphEdge::kProperty:
     case i::HeapGraphEdge::kShortcut:
       return ToApiHandle<String>(
           isolate->factory()->InternalizeUtf8String(edge->name()));
     case i::HeapGraphEdge::kElement:
     case i::HeapGraphEdge::kHidden:
     case i::HeapGraphEdge::kWeak:
       return ToApiHandle<Number>(
           isolate->factory()->NewNumberFromInt(edge->index()));
     default: UNREACHABLE();
   }
   return v8::Undefined();
 }
 
 
 const HeapGraphNode* HeapGraphEdge::GetFromNode() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapGraphEdge::GetFromNode");
   const i::HeapEntry* from = ToInternal(this)->from();
   return reinterpret_cast<const HeapGraphNode*>(from);
 }
 
 
 const HeapGraphNode* HeapGraphEdge::GetToNode() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapGraphEdge::GetToNode");
   const i::HeapEntry* to = ToInternal(this)->to();
   return reinterpret_cast<const HeapGraphNode*>(to);
 }
 
 
 static i::HeapEntry* ToInternal(const HeapGraphNode* entry) {
   return const_cast<i::HeapEntry*>(
       reinterpret_cast<const i::HeapEntry*>(entry));
 }
 
 
 HeapGraphNode::Type HeapGraphNode::GetType() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapGraphNode::GetType");
   return static_cast<HeapGraphNode::Type>(ToInternal(this)->type());
 }
 
 
 Handle<String> HeapGraphNode::GetName() const {
   i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapGraphNode::GetName");
   return ToApiHandle<String>(
       isolate->factory()->InternalizeUtf8String(ToInternal(this)->name()));
 }
 
 
 SnapshotObjectId HeapGraphNode::GetId() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapGraphNode::GetId");
   return ToInternal(this)->id();
 }
 
 
 int HeapGraphNode::GetSelfSize() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapGraphNode::GetSelfSize");
   return ToInternal(this)->self_size();
 }
 
 
 int HeapGraphNode::GetChildrenCount() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapSnapshot::GetChildrenCount");
   return ToInternal(this)->children().length();
 }
 
 
 const HeapGraphEdge* HeapGraphNode::GetChild(int index) const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapSnapshot::GetChild");
   return reinterpret_cast<const HeapGraphEdge*>(
       ToInternal(this)->children()[index]);
 }
 
 
 v8::Handle<v8::Value> HeapGraphNode::GetHeapValue() const {
   i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapGraphNode::GetHeapValue");
   i::Handle<i::HeapObject> object = ToInternal(this)->GetHeapObject();
   return !object.is_null() ?
       ToApiHandle<Value>(object) :
       ToApiHandle<Value>(isolate->factory()->undefined_value());
 }
 
 
 static i::HeapSnapshot* ToInternal(const HeapSnapshot* snapshot) {
   return const_cast<i::HeapSnapshot*>(
       reinterpret_cast<const i::HeapSnapshot*>(snapshot));
 }
 
 
 void HeapSnapshot::Delete() {
   i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapSnapshot::Delete");
   if (isolate->heap_profiler()->GetSnapshotsCount() > 1) {
     ToInternal(this)->Delete();
   } else {
     // If this is the last snapshot, clean up all accessory data as well.
     isolate->heap_profiler()->DeleteAllSnapshots();
   }
 }
 
 
 unsigned HeapSnapshot::GetUid() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapSnapshot::GetUid");
   return ToInternal(this)->uid();
 }
 
 
 Handle<String> HeapSnapshot::GetTitle() const {
   i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapSnapshot::GetTitle");
   return ToApiHandle<String>(
       isolate->factory()->InternalizeUtf8String(ToInternal(this)->title()));
 }
 
 
 const HeapGraphNode* HeapSnapshot::GetRoot() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapSnapshot::GetHead");
   return reinterpret_cast<const HeapGraphNode*>(ToInternal(this)->root());
 }
 
 
 const HeapGraphNode* HeapSnapshot::GetNodeById(SnapshotObjectId id) const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapSnapshot::GetNodeById");
   return reinterpret_cast<const HeapGraphNode*>(
       ToInternal(this)->GetEntryById(id));
 }
 
 
 int HeapSnapshot::GetNodesCount() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapSnapshot::GetNodesCount");
   return ToInternal(this)->entries().length();
 }
 
 
 const HeapGraphNode* HeapSnapshot::GetNode(int index) const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapSnapshot::GetNode");
   return reinterpret_cast<const HeapGraphNode*>(
       &ToInternal(this)->entries().at(index));
 }
 
 
 SnapshotObjectId HeapSnapshot::GetMaxSnapshotJSObjectId() const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapSnapshot::GetMaxSnapshotJSObjectId");
   return ToInternal(this)->max_snapshot_js_object_id();
 }
 
 
 void HeapSnapshot::Serialize(OutputStream* stream,
                              HeapSnapshot::SerializationFormat format) const {
-  i::Isolate* isolate = i::Isolate::Current();
-  IsDeadCheck(isolate, "v8::HeapSnapshot::Serialize");
   ApiCheck(format == kJSON,
            "v8::HeapSnapshot::Serialize",
            "Unknown serialization format");
   ApiCheck(stream->GetOutputEncoding() == OutputStream::kAscii,
            "v8::HeapSnapshot::Serialize",
            "Unsupported output encoding");
   ApiCheck(stream->GetChunkSize() > 0,
            "v8::HeapSnapshot::Serialize",
            "Invalid stream chunk size");
   i::HeapSnapshotJSONSerializer serializer(ToInternal(this));
@@ skipping 190 matching lines @@
   }
 
   ASSERT(last_handle_before_deferred_block_ == NULL ||
          found_block_before_deferred);
 
   // Iterate over live handles in the last block (if any).
   if (!blocks()->is_empty()) {
     v->VisitPointers(blocks()->last(), handle_scope_data_.next);
   }
 
-  if (!saved_contexts_.is_empty()) {
-    Object** start = reinterpret_cast<Object**>(&saved_contexts_.first());
-    v->VisitPointers(start, start + saved_contexts_.length());
+  List<Context*>* context_lists[2] = { &saved_contexts_, &entered_contexts_};
+  for (unsigned i = 0; i < ARRAY_SIZE(context_lists); i++) {
+    if (context_lists[i]->is_empty()) continue;
+    Object** start = reinterpret_cast<Object**>(&context_lists[i]->first());
+    v->VisitPointers(start, start + context_lists[i]->length());
   }
 }
 
 
 void HandleScopeImplementer::Iterate(ObjectVisitor* v) {
   v8::ImplementationUtilities::HandleScopeData* current =
       isolate_->handle_scope_data();
   handle_scope_data_ = *current;
   IterateThis(v);
 }
@@ skipping 86 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal