xref: /external/chromium_org/v8/src/api.cc

// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/api.h"

#include <string.h>  // For memcpy, strlen.
#ifdef V8_USE_ADDRESS_SANITIZER
#include <sanitizer/asan_interface.h>
#endif  // V8_USE_ADDRESS_SANITIZER
#include <cmath>  // For isnan.
#include "include/v8-debug.h"
#include "include/v8-profiler.h"
#include "include/v8-testing.h"
#include "src/assert-scope.h"
#include "src/bootstrapper.h"
#include "src/code-stubs.h"
#include "src/compiler.h"
#include "src/conversions-inl.h"
#include "src/counters.h"
#include "src/cpu-profiler.h"
#include "src/debug.h"
#include "src/deoptimizer.h"
#include "src/execution.h"
#include "src/global-handles.h"
#include "src/heap-profiler.h"
#include "src/heap-snapshot-generator-inl.h"
#include "src/icu_util.h"
#include "src/json-parser.h"
#include "src/messages.h"
#ifdef COMPRESS_STARTUP_DATA_BZ2
#include "src/natives.h"
#endif
#include "src/parser.h"
#include "src/platform.h"
#include "src/platform/time.h"
#include "src/profile-generator-inl.h"
#include "src/property-details.h"
#include "src/property.h"
#include "src/runtime.h"
#include "src/runtime-profiler.h"
#include "src/scanner-character-streams.h"
#include "src/simulator.h"
#include "src/snapshot.h"
#include "src/unicode-inl.h"
#include "src/utils/random-number-generator.h"
#include "src/v8threads.h"
#include "src/version.h"
#include "src/vm-state-inl.h"


#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 (IsExecutionTerminatingCheck(isolate)) {                      \
    code;                                                          \
    UNREACHABLE();                                                 \
  }


#define EXCEPTION_PREAMBLE(isolate)                                         \
  (isolate)->handle_scope_implementer()->IncrementCallDepth();              \
  ASSERT(!(isolate)->external_caught_exception());                          \
  bool has_pending_exception = false


#define EXCEPTION_BAILOUT_CHECK_GENERIC(isolate, value, do_callback)           \
  do {                                                                         \
    i::HandleScopeImplementer* handle_scope_implementer =                      \
        (isolate)->handle_scope_implementer();                                 \
    handle_scope_implementer->DecrementCallDepth();                            \
    if (has_pending_exception) {                                               \
      bool call_depth_is_zero = handle_scope_implementer->CallDepthIsZero();   \
      (isolate)->OptionalRescheduleException(call_depth_is_zero);              \
      do_callback                                                              \
      return value;                                                            \
    }                                                                          \
    do_callback                                                                \
  } while (false)


#define EXCEPTION_BAILOUT_CHECK_DO_CALLBACK(isolate, value)                    \
  EXCEPTION_BAILOUT_CHECK_GENERIC(                                             \
      isolate, value, isolate->FireCallCompletedCallback();)


#define EXCEPTION_BAILOUT_CHECK(isolate, value)                                \
  EXCEPTION_BAILOUT_CHECK_GENERIC(isolate, value, ;)


// --- E x c e p t i o n   B e h a v i o r ---


void i::FatalProcessOutOfMemory(const char* location) {
  i::V8::FatalProcessOutOfMemory(location, false);
}


// When V8 cannot allocated memory FatalProcessOutOfMemory is called.
// The default fatal error handler is called and execution is stopped.
void i::V8::FatalProcessOutOfMemory(const char* location, bool take_snapshot) {
  i::HeapStats heap_stats;
  int start_marker;
  heap_stats.start_marker = &start_marker;
  int new_space_size;
  heap_stats.new_space_size = &new_space_size;
  int new_space_capacity;
  heap_stats.new_space_capacity = &new_space_capacity;
  intptr_t old_pointer_space_size;
  heap_stats.old_pointer_space_size = &old_pointer_space_size;
  intptr_t old_pointer_space_capacity;
  heap_stats.old_pointer_space_capacity = &old_pointer_space_capacity;
  intptr_t old_data_space_size;
  heap_stats.old_data_space_size = &old_data_space_size;
  intptr_t old_data_space_capacity;
  heap_stats.old_data_space_capacity = &old_data_space_capacity;
  intptr_t code_space_size;
  heap_stats.code_space_size = &code_space_size;
  intptr_t code_space_capacity;
  heap_stats.code_space_capacity = &code_space_capacity;
  intptr_t map_space_size;
  heap_stats.map_space_size = &map_space_size;
  intptr_t map_space_capacity;
  heap_stats.map_space_capacity = &map_space_capacity;
  intptr_t cell_space_size;
  heap_stats.cell_space_size = &cell_space_size;
  intptr_t cell_space_capacity;
  heap_stats.cell_space_capacity = &cell_space_capacity;
  intptr_t property_cell_space_size;
  heap_stats.property_cell_space_size = &property_cell_space_size;
  intptr_t property_cell_space_capacity;
  heap_stats.property_cell_space_capacity = &property_cell_space_capacity;
  intptr_t lo_space_size;
  heap_stats.lo_space_size = &lo_space_size;
  int global_handle_count;
  heap_stats.global_handle_count = &global_handle_count;
  int weak_global_handle_count;
  heap_stats.weak_global_handle_count = &weak_global_handle_count;
  int pending_global_handle_count;
  heap_stats.pending_global_handle_count = &pending_global_handle_count;
  int near_death_global_handle_count;
  heap_stats.near_death_global_handle_count = &near_death_global_handle_count;
  int free_global_handle_count;
  heap_stats.free_global_handle_count = &free_global_handle_count;
  intptr_t memory_allocator_size;
  heap_stats.memory_allocator_size = &memory_allocator_size;
  intptr_t memory_allocator_capacity;
  heap_stats.memory_allocator_capacity = &memory_allocator_capacity;
  int objects_per_type[LAST_TYPE + 1] = {0};
  heap_stats.objects_per_type = objects_per_type;
  int size_per_type[LAST_TYPE + 1] = {0};
  heap_stats.size_per_type = size_per_type;
  int os_error;
  heap_stats.os_error = &os_error;
  int end_marker;
  heap_stats.end_marker = &end_marker;
  i::Isolate* isolate = i::Isolate::Current();
  if (isolate->heap()->HasBeenSetUp()) {
    // BUG(1718): Don't use the take_snapshot since we don't support
    // HeapIterator here without doing a special GC.
    isolate->heap()->RecordStats(&heap_stats, false);
  }
  Utils::ApiCheck(false, location, "Allocation failed - process out of memory");
  // If the fatal error handler returns, we stop execution.
  FATAL("API fatal error handler returned after process out of memory");
}


void Utils::ReportApiFailure(const char* location, const char* message) {
  i::Isolate* isolate = i::Isolate::Current();
  FatalErrorCallback callback = isolate->exception_behavior();
  if (callback == NULL) {
    i::OS::PrintError("\n#\n# Fatal error in %s\n# %s\n#\n\n",
                      location, message);
    i::OS::Abort();
  } else {
    callback(location, message);
  }
  isolate->SignalFatalError();
}


bool V8::IsDead() {
  i::Isolate* isolate = i::Isolate::Current();
  return isolate->IsDead();
}


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;
}


// --- S t a t i c s ---


static bool InitializeHelper(i::Isolate* isolate) {
  // If the isolate has a function entry hook, it needs to re-build all its
  // code stubs with entry hooks embedded, so let's deserialize a snapshot.
  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) {
  return (isolate != NULL && isolate->IsInitialized()) ||
      Utils::ApiCheck(InitializeHelper(isolate),
                      location,
                      "Error initializing V8");
}


StartupDataDecompressor::StartupDataDecompressor()
    : raw_data(i::NewArray<char*>(V8::GetCompressedStartupDataCount())) {
  for (int i = 0; i < V8::GetCompressedStartupDataCount(); ++i) {
    raw_data[i] = NULL;
  }
}


StartupDataDecompressor::~StartupDataDecompressor() {
  for (int i = 0; i < V8::GetCompressedStartupDataCount(); ++i) {
    i::DeleteArray(raw_data[i]);
  }
  i::DeleteArray(raw_data);
}


int StartupDataDecompressor::Decompress() {
  int compressed_data_count = V8::GetCompressedStartupDataCount();
  StartupData* compressed_data =
      i::NewArray<StartupData>(compressed_data_count);
  V8::GetCompressedStartupData(compressed_data);
  for (int i = 0; i < compressed_data_count; ++i) {
    char* decompressed = raw_data[i] =
        i::NewArray<char>(compressed_data[i].raw_size);
    if (compressed_data[i].compressed_size != 0) {
      int result = DecompressData(decompressed,
                                  &compressed_data[i].raw_size,
                                  compressed_data[i].data,
                                  compressed_data[i].compressed_size);
      if (result != 0) return result;
    } else {
      ASSERT_EQ(0, compressed_data[i].raw_size);
    }
    compressed_data[i].data = decompressed;
  }
  V8::SetDecompressedStartupData(compressed_data);
  i::DeleteArray(compressed_data);
  return 0;
}


StartupData::CompressionAlgorithm V8::GetCompressedStartupDataAlgorithm() {
#ifdef COMPRESS_STARTUP_DATA_BZ2
  return StartupData::kBZip2;
#else
  return StartupData::kUncompressed;
#endif
}


enum CompressedStartupDataItems {
  kSnapshot = 0,
  kSnapshotContext,
  kLibraries,
  kExperimentalLibraries,
  kCompressedStartupDataCount
};


int V8::GetCompressedStartupDataCount() {
#ifdef COMPRESS_STARTUP_DATA_BZ2
  return kCompressedStartupDataCount;
#else
  return 0;
#endif
}


void V8::GetCompressedStartupData(StartupData* compressed_data) {
#ifdef COMPRESS_STARTUP_DATA_BZ2
  compressed_data[kSnapshot].data =
      reinterpret_cast<const char*>(i::Snapshot::data());
  compressed_data[kSnapshot].compressed_size = i::Snapshot::size();
  compressed_data[kSnapshot].raw_size = i::Snapshot::raw_size();

  compressed_data[kSnapshotContext].data =
      reinterpret_cast<const char*>(i::Snapshot::context_data());
  compressed_data[kSnapshotContext].compressed_size =
      i::Snapshot::context_size();
  compressed_data[kSnapshotContext].raw_size = i::Snapshot::context_raw_size();

  i::Vector<const i::byte> libraries_source = i::Natives::GetScriptsSource();
  compressed_data[kLibraries].data =
      reinterpret_cast<const char*>(libraries_source.start());
  compressed_data[kLibraries].compressed_size = libraries_source.length();
  compressed_data[kLibraries].raw_size = i::Natives::GetRawScriptsSize();

  i::Vector<const i::byte> exp_libraries_source =
      i::ExperimentalNatives::GetScriptsSource();
  compressed_data[kExperimentalLibraries].data =
      reinterpret_cast<const char*>(exp_libraries_source.start());
  compressed_data[kExperimentalLibraries].compressed_size =
      exp_libraries_source.length();
  compressed_data[kExperimentalLibraries].raw_size =
      i::ExperimentalNatives::GetRawScriptsSize();
#endif
}


void V8::SetDecompressedStartupData(StartupData* decompressed_data) {
#ifdef COMPRESS_STARTUP_DATA_BZ2
  ASSERT_EQ(i::Snapshot::raw_size(), decompressed_data[kSnapshot].raw_size);
  i::Snapshot::set_raw_data(
      reinterpret_cast<const i::byte*>(decompressed_data[kSnapshot].data));

  ASSERT_EQ(i::Snapshot::context_raw_size(),
            decompressed_data[kSnapshotContext].raw_size);
  i::Snapshot::set_context_raw_data(
      reinterpret_cast<const i::byte*>(
          decompressed_data[kSnapshotContext].data));

  ASSERT_EQ(i::Natives::GetRawScriptsSize(),
            decompressed_data[kLibraries].raw_size);
  i::Vector<const char> libraries_source(
      decompressed_data[kLibraries].data,
      decompressed_data[kLibraries].raw_size);
  i::Natives::SetRawScriptsSource(libraries_source);

  ASSERT_EQ(i::ExperimentalNatives::GetRawScriptsSize(),
            decompressed_data[kExperimentalLibraries].raw_size);
  i::Vector<const char> exp_libraries_source(
      decompressed_data[kExperimentalLibraries].data,
      decompressed_data[kExperimentalLibraries].raw_size);
  i::ExperimentalNatives::SetRawScriptsSource(exp_libraries_source);
#endif
}


void V8::SetFatalErrorHandler(FatalErrorCallback that) {
  i::Isolate* isolate = i::Isolate::UncheckedCurrent();
  isolate->set_exception_behavior(that);
}


void V8::SetAllowCodeGenerationFromStringsCallback(
    AllowCodeGenerationFromStringsCallback callback) {
  i::Isolate* isolate = i::Isolate::UncheckedCurrent();
  isolate->set_allow_code_gen_callback(callback);
}


void V8::SetFlagsFromString(const char* str, int length) {
  i::FlagList::SetFlagsFromString(str, length);
}


void V8::SetFlagsFromCommandLine(int* argc, char** argv, bool remove_flags) {
  i::FlagList::SetFlagsFromCommandLine(argc, argv, remove_flags);
}


RegisteredExtension* RegisteredExtension::first_extension_ = NULL;


RegisteredExtension::RegisteredExtension(Extension* extension)
    : extension_(extension) { }


void RegisteredExtension::Register(RegisteredExtension* that) {
  that->next_ = first_extension_;
  first_extension_ = that;
}


void RegisteredExtension::UnregisterAll() {
  RegisteredExtension* re = first_extension_;
  while (re != NULL) {
    RegisteredExtension* next = re->next();
    delete re;
    re = next;
  }
}


void RegisterExtension(Extension* that) {
  RegisteredExtension* extension = new RegisteredExtension(that);
  RegisteredExtension::Register(extension);
}


Extension::Extension(const char* name,
                     const char* source,
                     int dep_count,
                     const char** deps,
                     int source_length)
    : name_(name),
      source_length_(source_length >= 0 ?
                     source_length :
                     (source ? static_cast<int>(strlen(source)) : 0)),
      source_(source, source_length_),
      dep_count_(dep_count),
      deps_(deps),
      auto_enable_(false) {
  CHECK(source != NULL || source_length_ == 0);
}


ResourceConstraints::ResourceConstraints()
    : max_semi_space_size_(0),
      max_old_space_size_(0),
      max_executable_size_(0),
      stack_limit_(NULL),
      max_available_threads_(0),
      code_range_size_(0) { }

void ResourceConstraints::ConfigureDefaults(uint64_t physical_memory,
                                            uint64_t virtual_memory_limit,
                                            uint32_t number_of_processors) {
#if V8_OS_ANDROID
  // Android has higher physical memory requirements before raising the maximum
  // heap size limits since it has no swap space.
  const uint64_t low_limit = 512ul * i::MB;
  const uint64_t medium_limit = 1ul * i::GB;
  const uint64_t high_limit = 2ul * i::GB;
#else
  const uint64_t low_limit = 512ul * i::MB;
  const uint64_t medium_limit = 768ul * i::MB;
  const uint64_t high_limit = 1ul  * i::GB;
#endif

  if (physical_memory <= low_limit) {
    set_max_semi_space_size(i::Heap::kMaxSemiSpaceSizeLowMemoryDevice);
    set_max_old_space_size(i::Heap::kMaxOldSpaceSizeLowMemoryDevice);
    set_max_executable_size(i::Heap::kMaxExecutableSizeLowMemoryDevice);
  } else if (physical_memory <= medium_limit) {
    set_max_semi_space_size(i::Heap::kMaxSemiSpaceSizeMediumMemoryDevice);
    set_max_old_space_size(i::Heap::kMaxOldSpaceSizeMediumMemoryDevice);
    set_max_executable_size(i::Heap::kMaxExecutableSizeMediumMemoryDevice);
  } else if (physical_memory <= high_limit) {
    set_max_semi_space_size(i::Heap::kMaxSemiSpaceSizeHighMemoryDevice);
    set_max_old_space_size(i::Heap::kMaxOldSpaceSizeHighMemoryDevice);
    set_max_executable_size(i::Heap::kMaxExecutableSizeHighMemoryDevice);
  } else {
    set_max_semi_space_size(i::Heap::kMaxSemiSpaceSizeHugeMemoryDevice);
    set_max_old_space_size(i::Heap::kMaxOldSpaceSizeHugeMemoryDevice);
    set_max_executable_size(i::Heap::kMaxExecutableSizeHugeMemoryDevice);
  }

  set_max_available_threads(i::Max(i::Min(number_of_processors, 4u), 1u));

  if (virtual_memory_limit > 0 && i::kRequiresCodeRange) {
    // Reserve no more than 1/8 of the memory for the code range, but at most
    // kMaximalCodeRangeSize.
    set_code_range_size(
        i::Min(i::kMaximalCodeRangeSize / i::MB,
               static_cast<size_t>((virtual_memory_limit >> 3) / i::MB)));
  }
}


bool SetResourceConstraints(Isolate* v8_isolate,
                            ResourceConstraints* constraints) {
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  int semi_space_size = constraints->max_semi_space_size();
  int old_space_size = constraints->max_old_space_size();
  int max_executable_size = constraints->max_executable_size();
  size_t code_range_size = constraints->code_range_size();
  if (semi_space_size != 0 || old_space_size != 0 ||
      max_executable_size != 0 || code_range_size != 0) {
    // After initialization it's too late to change Heap constraints.
    ASSERT(!isolate->IsInitialized());
    bool result = isolate->heap()->ConfigureHeap(semi_space_size,
                                                 old_space_size,
                                                 max_executable_size,
                                                 code_range_size);
    if (!result) return false;
  }
  if (constraints->stack_limit() != NULL) {
    uintptr_t limit = reinterpret_cast<uintptr_t>(constraints->stack_limit());
    isolate->stack_guard()->SetStackLimit(limit);
  }

  isolate->set_max_available_threads(constraints->max_available_threads());
  return true;
}


i::Object** V8::GlobalizeReference(i::Isolate* isolate, i::Object** obj) {
  LOG_API(isolate, "Persistent::New");
  i::Handle<i::Object> result = isolate->global_handles()->Create(*obj);
#ifdef DEBUG
  (*obj)->ObjectVerify();
#endif  // DEBUG
  return result.location();
}


i::Object** V8::CopyPersistent(i::Object** obj) {
  i::Handle<i::Object> result = i::GlobalHandles::CopyGlobal(obj);
#ifdef DEBUG
  (*obj)->ObjectVerify();
#endif  // DEBUG
  return result.location();
}


void V8::MakeWeak(i::Object** object,
                  void* parameters,
                  WeakCallback weak_callback) {
  i::GlobalHandles::MakeWeak(object, parameters, weak_callback);
}


void* V8::ClearWeak(i::Object** obj) {
  return i::GlobalHandles::ClearWeakness(obj);
}


void V8::DisposeGlobal(i::Object** obj) {
  i::GlobalHandles::Destroy(obj);
}


void V8::Eternalize(Isolate* v8_isolate, Value* value, int* index) {
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  i::Object* object = *Utils::OpenHandle(value);
  isolate->eternal_handles()->Create(isolate, object, index);
}


Local<Value> V8::GetEternal(Isolate* v8_isolate, int index) {
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  return Utils::ToLocal(isolate->eternal_handles()->Get(index));
}


// --- H a n d l e s ---


HandleScope::HandleScope(Isolate* isolate) {
  Initialize(isolate);
}


void HandleScope::Initialize(Isolate* isolate) {
  i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
  // We do not want to check the correct usage of the Locker class all over the
  // place, so we do it only here: Without a HandleScope, an embedder can do
  // almost nothing, so it is enough to check in this central place.
  Utils::ApiCheck(!v8::Locker::IsActive() ||
                  internal_isolate->thread_manager()->IsLockedByCurrentThread(),
                  "HandleScope::HandleScope",
                  "Entering the V8 API without proper locking in place");
  i::HandleScopeData* current = internal_isolate->handle_scope_data();
  isolate_ = internal_isolate;
  prev_next_ = current->next;
  prev_limit_ = current->limit;
  current->level++;
}


HandleScope::~HandleScope() {
  i::HandleScope::CloseScope(isolate_, prev_next_, prev_limit_);
}


int HandleScope::NumberOfHandles(Isolate* isolate) {
  return i::HandleScope::NumberOfHandles(
      reinterpret_cast<i::Isolate*>(isolate));
}


i::Object** HandleScope::CreateHandle(i::Isolate* isolate, i::Object* value) {
  return i::HandleScope::CreateHandle(isolate, value);
}


i::Object** HandleScope::CreateHandle(i::HeapObject* heap_object,
                                      i::Object* value) {
  ASSERT(heap_object->IsHeapObject());
  return i::HandleScope::CreateHandle(heap_object->GetIsolate(), value);
}


EscapableHandleScope::EscapableHandleScope(Isolate* v8_isolate) {
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  escape_slot_ = CreateHandle(isolate, isolate->heap()->the_hole_value());
  Initialize(v8_isolate);
}


i::Object** EscapableHandleScope::Escape(i::Object** escape_value) {
  i::Heap* heap = reinterpret_cast<i::Isolate*>(GetIsolate())->heap();
  Utils::ApiCheck(*escape_slot_ == heap->the_hole_value(),
                  "EscapeableHandleScope::Escape",
                  "Escape value set twice");
  if (escape_value == NULL) {
    *escape_slot_ = heap->undefined_value();
    return NULL;
  }
  *escape_slot_ = *escape_value;
  return escape_slot_;
}


void Context::Enter() {
  i::Handle<i::Context> env = Utils::OpenHandle(this);
  i::Isolate* isolate = env->GetIsolate();
  ENTER_V8(isolate);
  i::HandleScopeImplementer* impl = isolate->handle_scope_implementer();
  impl->EnterContext(env);
  impl->SaveContext(isolate->context());
  isolate->set_context(*env);
}


void Context::Exit() {
  i::Handle<i::Context> env = Utils::OpenHandle(this);
  i::Isolate* isolate = env->GetIsolate();
  ENTER_V8(isolate);
  i::HandleScopeImplementer* impl = isolate->handle_scope_implementer();
  if (!Utils::ApiCheck(impl->LastEnteredContextWas(env),
                       "v8::Context::Exit()",
                       "Cannot exit non-entered context")) {
    return;
  }
  impl->LeaveContext();
  isolate->set_context(impl->RestoreContext());
}


static void* DecodeSmiToAligned(i::Object* value, const char* location) {
  Utils::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);
  Utils::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 =
      Utils::ApiCheck(env->IsNativeContext(),
                      location,
                      "Not a native context") &&
      Utils::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 (!Utils::ApiCheck(can_grow, location, "Index too large")) {
    return i::Handle<i::FixedArray>();
  }
  int new_size = i::Max(index, data->length() << 1) + 1;
  data = i::FixedArray::CopySize(data, new_size);
  env->set_embedder_data(*data);
  return data;
}


v8::Local<v8::Value> Context::SlowGetEmbedderData(int index) {
  const char* location = "v8::Context::GetEmbedderData()";
  i::Handle<i::FixedArray> data = EmbedderDataFor(this, index, false, location);
  if (data.is_null()) return Local<Value>();
  i::Handle<i::Object> result(data->get(index), data->GetIsolate());
  return Utils::ToLocal(result);
}


void Context::SetEmbedderData(int index, v8::Handle<Value> value) {
  const char* location = "v8::Context::SetEmbedderData()";
  i::Handle<i::FixedArray> data = EmbedderDataFor(this, index, true, location);
  if (data.is_null()) return;
  i::Handle<i::Object> val = Utils::OpenHandle(*value);
  data->set(index, *val);
  ASSERT_EQ(*Utils::OpenHandle(*value),
            *Utils::OpenHandle(*GetEmbedderData(index)));
}


void* Context::SlowGetAlignedPointerFromEmbedderData(int index) {
  const char* location = "v8::Context::GetAlignedPointerFromEmbedderData()";
  i::Handle<i::FixedArray> data = EmbedderDataFor(this, index, false, location);
  if (data.is_null()) return NULL;
  return DecodeSmiToAligned(data->get(index), location);
}


void Context::SetAlignedPointerInEmbedderData(int index, void* value) {
  const char* location = "v8::Context::SetAlignedPointerInEmbedderData()";
  i::Handle<i::FixedArray> data = EmbedderDataFor(this, index, true, location);
  data->set(index, EncodeAlignedAsSmi(value, location));
  ASSERT_EQ(value, GetAlignedPointerFromEmbedderData(index));
}


// --- N e a n d e r ---


// A constructor cannot easily return an error value, therefore it is necessary
// to check for a dead VM with ON_BAILOUT before constructing any Neander
// objects.  To remind you about this there is no HandleScope in the
// NeanderObject constructor.  When you add one to the site calling the
// constructor you should check that you ensured the VM was not dead first.
NeanderObject::NeanderObject(v8::internal::Isolate* isolate, int size) {
  EnsureInitializedForIsolate(isolate, "v8::Nowhere");
  ENTER_V8(isolate);
  value_ = isolate->factory()->NewNeanderObject();
  i::Handle<i::FixedArray> elements = isolate->factory()->NewFixedArray(size);
  value_->set_elements(*elements);
}


int NeanderObject::size() {
  return i::FixedArray::cast(value_->elements())->length();
}


NeanderArray::NeanderArray(v8::internal::Isolate* isolate) : obj_(isolate, 2) {
  obj_.set(0, i::Smi::FromInt(0));
}


int NeanderArray::length() {
  return i::Smi::cast(obj_.get(0))->value();
}


i::Object* NeanderArray::get(int offset) {
  ASSERT(0 <= offset);
  ASSERT(offset < length());
  return obj_.get(offset + 1);
}


// This method cannot easily return an error value, therefore it is necessary
// to check for a dead VM with ON_BAILOUT before calling it.  To remind you
// about this there is no HandleScope in this method.  When you add one to the
// site calling this method you should check that you ensured the VM was not
// dead first.
void NeanderArray::add(i::Handle<i::Object> value) {
  int length = this->length();
  int size = obj_.size();
  if (length == size - 1) {
    i::Factory* factory = i::Isolate::Current()->factory();
    i::Handle<i::FixedArray> new_elms = factory->NewFixedArray(2 * size);
    for (int i = 0; i < length; i++)
      new_elms->set(i + 1, get(i));
    obj_.value()->set_elements(*new_elms);
  }
  obj_.set(length + 1, *value);
  obj_.set(0, i::Smi::FromInt(length + 1));
}


void NeanderArray::set(int index, i::Object* value) {
  if (index < 0 || index >= this->length()) return;
  obj_.set(index + 1, value);
}


// --- T e m p l a t e ---


static void InitializeTemplate(i::Handle<i::TemplateInfo> that, int type) {
  that->set_tag(i::Smi::FromInt(type));
}


static void TemplateSet(i::Isolate* isolate,
                        v8::Template* templ,
                        int length,
                        v8::Handle<v8::Data>* data) {
  i::Handle<i::Object> list(Utils::OpenHandle(templ)->property_list(), isolate);
  if (list->IsUndefined()) {
    list = NeanderArray(isolate).value();
    Utils::OpenHandle(templ)->set_property_list(*list);
  }
  NeanderArray array(list);
  array.add(isolate->factory()->NewNumberFromInt(length));
  for (int i = 0; i < length; i++) {
    i::Handle<i::Object> value = data[i].IsEmpty() ?
        i::Handle<i::Object>(isolate->factory()->undefined_value()) :
        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();
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  const int kSize = 3;
  v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
  v8::Handle<v8::Data> data[kSize] = {
    name,
    value,
    v8::Integer::New(v8_isolate, 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();
  ENTER_V8(isolate);
  ASSERT(!name.IsEmpty());
  ASSERT(!getter.IsEmpty() || !setter.IsEmpty());
  i::HandleScope scope(isolate);
  const int kSize = 5;
  v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
  v8::Handle<v8::Data> data[kSize] = {
    name,
    getter,
    setter,
    v8::Integer::New(v8_isolate, attribute),
    v8::Integer::New(v8_isolate, 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* i_isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(i_isolate);
  i::Handle<i::Object> result(Utils::OpenHandle(this)->prototype_template(),
                              i_isolate);
  if (result->IsUndefined()) {
    v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(i_isolate);
    result = Utils::OpenHandle(*ObjectTemplate::New(isolate));
    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();
  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,
    int length,
    bool do_not_cache) {
  i::Handle<i::Struct> struct_obj =
      isolate->factory()->NewStruct(i::FUNCTION_TEMPLATE_INFO_TYPE);
  i::Handle<i::FunctionTemplateInfo> obj =
      i::Handle<i::FunctionTemplateInfo>::cast(struct_obj);
  InitializeFunctionTemplate(obj);
  obj->set_do_not_cache(do_not_cache);
  int next_serial_number = 0;
  if (!do_not_cache) {
    next_serial_number = isolate->next_serial_number() + 1;
    isolate->set_next_serial_number(next_serial_number);
  }
  obj->set_serial_number(i::Smi::FromInt(next_serial_number));
  if (callback != 0) {
    if (data.IsEmpty()) {
      data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
    }
    Utils::ToLocal(obj)->SetCallHandler(callback, data);
  }
  obj->set_length(length);
  obj->set_undetectable(false);
  obj->set_needs_access_check(false);
  if (!signature.IsEmpty())
    obj->set_signature(*Utils::OpenHandle(*signature));
  return Utils::ToLocal(obj);
}

Local<FunctionTemplate> FunctionTemplate::New(
    Isolate* isolate,
    FunctionCallback callback,
    v8::Handle<Value> data,
    v8::Handle<Signature> signature,
    int length) {
  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
  EnsureInitializedForIsolate(i_isolate, "v8::FunctionTemplate::New()");
  LOG_API(i_isolate, "FunctionTemplate::New");
  ENTER_V8(i_isolate);
  return FunctionTemplateNew(
      i_isolate, callback, data, signature, length, false);
}


Local<Signature> Signature::New(Isolate* isolate,
                                Handle<FunctionTemplate> receiver, int argc,
                                Handle<FunctionTemplate> argv[]) {
  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
  EnsureInitializedForIsolate(i_isolate, "v8::Signature::New()");
  LOG_API(i_isolate, "Signature::New");
  ENTER_V8(i_isolate);
  i::Handle<i::Struct> struct_obj =
      i_isolate->factory()->NewStruct(i::SIGNATURE_INFO_TYPE);
  i::Handle<i::SignatureInfo> obj =
      i::Handle<i::SignatureInfo>::cast(struct_obj);
  if (!receiver.IsEmpty()) obj->set_receiver(*Utils::OpenHandle(*receiver));
  if (argc > 0) {
    i::Handle<i::FixedArray> args = i_isolate->factory()->NewFixedArray(argc);
    for (int i = 0; i < argc; i++) {
      if (!argv[i].IsEmpty())
        args->set(i, *Utils::OpenHandle(*argv[i]));
    }
    obj->set_args(*args);
  }
  return Utils::ToLocal(obj);
}


Local<AccessorSignature> AccessorSignature::New(
    Isolate* isolate,
    Handle<FunctionTemplate> receiver) {
  return Utils::AccessorSignatureToLocal(Utils::OpenHandle(*receiver));
}


template<typename Operation>
static Local<Operation> NewDescriptor(
    Isolate* isolate,
    const i::DeclaredAccessorDescriptorData& data,
    Data* previous_descriptor) {
  i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
  i::Handle<i::DeclaredAccessorDescriptor> previous =
      i::Handle<i::DeclaredAccessorDescriptor>();
  if (previous_descriptor != NULL) {
    previous = Utils::OpenHandle(
        static_cast<DeclaredAccessorDescriptor*>(previous_descriptor));
  }
  i::Handle<i::DeclaredAccessorDescriptor> descriptor =
      i::DeclaredAccessorDescriptor::Create(internal_isolate, data, previous);
  return Utils::Convert<i::DeclaredAccessorDescriptor, Operation>(descriptor);
}


Local<RawOperationDescriptor>
ObjectOperationDescriptor::NewInternalFieldDereference(
    Isolate* isolate,
    int internal_field) {
  i::DeclaredAccessorDescriptorData data;
  data.type = i::kDescriptorObjectDereference;
  data.object_dereference_descriptor.internal_field = internal_field;
  return NewDescriptor<RawOperationDescriptor>(isolate, data, NULL);
}


Local<RawOperationDescriptor> RawOperationDescriptor::NewRawShift(
    Isolate* isolate,
    int16_t byte_offset) {
  i::DeclaredAccessorDescriptorData data;
  data.type = i::kDescriptorPointerShift;
  data.pointer_shift_descriptor.byte_offset = byte_offset;
  return NewDescriptor<RawOperationDescriptor>(isolate, data, this);
}


Local<DeclaredAccessorDescriptor> RawOperationDescriptor::NewHandleDereference(
    Isolate* isolate) {
  i::DeclaredAccessorDescriptorData data;
  data.type = i::kDescriptorReturnObject;
  return NewDescriptor<DeclaredAccessorDescriptor>(isolate, data, this);
}


Local<RawOperationDescriptor> RawOperationDescriptor::NewRawDereference(
    Isolate* isolate) {
  i::DeclaredAccessorDescriptorData data;
  data.type = i::kDescriptorPointerDereference;
  return NewDescriptor<RawOperationDescriptor>(isolate, data, this);
}


Local<DeclaredAccessorDescriptor> RawOperationDescriptor::NewPointerCompare(
    Isolate* isolate,
    void* compare_value) {
  i::DeclaredAccessorDescriptorData data;
  data.type = i::kDescriptorPointerCompare;
  data.pointer_compare_descriptor.compare_value = compare_value;
  return NewDescriptor<DeclaredAccessorDescriptor>(isolate, data, this);
}


Local<DeclaredAccessorDescriptor> RawOperationDescriptor::NewPrimitiveValue(
    Isolate* isolate,
    DeclaredAccessorDescriptorDataType data_type,
    uint8_t bool_offset) {
  i::DeclaredAccessorDescriptorData data;
  data.type = i::kDescriptorPrimitiveValue;
  data.primitive_value_descriptor.data_type = data_type;
  data.primitive_value_descriptor.bool_offset = bool_offset;
  return NewDescriptor<DeclaredAccessorDescriptor>(isolate, data, this);
}


template<typename T>
static Local<DeclaredAccessorDescriptor> NewBitmaskCompare(
    Isolate* isolate,
    T bitmask,
    T compare_value,
    RawOperationDescriptor* operation) {
  i::DeclaredAccessorDescriptorData data;
  data.type = i::kDescriptorBitmaskCompare;
  data.bitmask_compare_descriptor.bitmask = bitmask;
  data.bitmask_compare_descriptor.compare_value = compare_value;
  data.bitmask_compare_descriptor.size = sizeof(T);
  return NewDescriptor<DeclaredAccessorDescriptor>(isolate, data, operation);
}


Local<DeclaredAccessorDescriptor> RawOperationDescriptor::NewBitmaskCompare8(
    Isolate* isolate,
    uint8_t bitmask,
    uint8_t compare_value) {
  return NewBitmaskCompare(isolate, bitmask, compare_value, this);
}


Local<DeclaredAccessorDescriptor> RawOperationDescriptor::NewBitmaskCompare16(
    Isolate* isolate,
    uint16_t bitmask,
    uint16_t compare_value) {
  return NewBitmaskCompare(isolate, bitmask, compare_value, this);
}


Local<DeclaredAccessorDescriptor> RawOperationDescriptor::NewBitmaskCompare32(
    Isolate* isolate,
    uint32_t bitmask,
    uint32_t compare_value) {
  return NewBitmaskCompare(isolate, bitmask, compare_value, this);
}


Local<TypeSwitch> TypeSwitch::New(Handle<FunctionTemplate> type) {
  Handle<FunctionTemplate> types[1] = { type };
  return TypeSwitch::New(1, types);
}


Local<TypeSwitch> TypeSwitch::New(int argc, Handle<FunctionTemplate> types[]) {
  i::Isolate* isolate = i::Isolate::Current();
  EnsureInitializedForIsolate(isolate, "v8::TypeSwitch::New()");
  LOG_API(isolate, "TypeSwitch::New");
  ENTER_V8(isolate);
  i::Handle<i::FixedArray> vector = isolate->factory()->NewFixedArray(argc);
  for (int i = 0; i < argc; i++)
    vector->set(i, *Utils::OpenHandle(*types[i]));
  i::Handle<i::Struct> struct_obj =
      isolate->factory()->NewStruct(i::TYPE_SWITCH_INFO_TYPE);
  i::Handle<i::TypeSwitchInfo> obj =
      i::Handle<i::TypeSwitchInfo>::cast(struct_obj);
  obj->set_types(*vector);
  return Utils::ToLocal(obj);
}


int TypeSwitch::match(v8::Handle<Value> value) {
  i::Isolate* isolate = i::Isolate::Current();
  LOG_API(isolate, "TypeSwitch::match");
  USE(isolate);
  i::Handle<i::Object> obj = Utils::OpenHandle(*value);
  i::Handle<i::TypeSwitchInfo> info = Utils::OpenHandle(this);
  i::FixedArray* types = i::FixedArray::cast(info->types());
  for (int i = 0; i < types->length(); i++) {
    if (i::FunctionTemplateInfo::cast(types->get(i))->IsTemplateFor(*obj))
      return i + 1;
  }
  return 0;
}


#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();
  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(reinterpret_cast<v8::Isolate*>(isolate));
  }
  obj->set_data(*Utils::OpenHandle(*data));
  Utils::OpenHandle(this)->set_call_code(*obj);
}


static i::Handle<i::AccessorInfo> SetAccessorInfoProperties(
    i::Handle<i::AccessorInfo> obj,
    v8::Handle<String> name,
    v8::AccessControl settings,
    v8::PropertyAttribute attributes,
    v8::Handle<AccessorSignature> signature) {
  obj->set_name(*Utils::OpenHandle(*name));
  if (settings & ALL_CAN_READ) obj->set_all_can_read(true);
  if (settings & ALL_CAN_WRITE) obj->set_all_can_write(true);
  obj->set_property_attributes(static_cast<PropertyAttributes>(attributes));
  if (!signature.IsEmpty()) {
    obj->set_expected_receiver_type(*Utils::OpenHandle(*signature));
  }
  return obj;
}


template<typename Getter, typename Setter>
static i::Handle<i::AccessorInfo> MakeAccessorInfo(
    v8::Handle<String> name,
    Getter getter,
    Setter setter,
    v8::Handle<Value> data,
    v8::AccessControl settings,
    v8::PropertyAttribute attributes,
    v8::Handle<AccessorSignature> signature) {
  i::Isolate* isolate = Utils::OpenHandle(*name)->GetIsolate();
  i::Handle<i::ExecutableAccessorInfo> obj =
      isolate->factory()->NewExecutableAccessorInfo();
  SET_FIELD_WRAPPED(obj, set_getter, getter);
  SET_FIELD_WRAPPED(obj, set_setter, setter);
  if (data.IsEmpty()) {
    data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
  }
  obj->set_data(*Utils::OpenHandle(*data));
  return SetAccessorInfoProperties(obj, name, settings, attributes, signature);
}


static i::Handle<i::AccessorInfo> MakeAccessorInfo(
    v8::Handle<String> name,
    v8::Handle<v8::DeclaredAccessorDescriptor> descriptor,
    void* setter_ignored,
    void* data_ignored,
    v8::AccessControl settings,
    v8::PropertyAttribute attributes,
    v8::Handle<AccessorSignature> signature) {
  i::Isolate* isolate = Utils::OpenHandle(*name)->GetIsolate();
  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::Handle<i::FunctionTemplateInfo> handle = Utils::OpenHandle(this, true);
  if (!Utils::ApiCheck(!handle.is_null(),
                       "v8::FunctionTemplate::InstanceTemplate()",
                       "Reading from empty handle")) {
    return Local<ObjectTemplate>();
  }
  i::Isolate* isolate = handle->GetIsolate();
  ENTER_V8(isolate);
  if (handle->instance_template()->IsUndefined()) {
    Local<ObjectTemplate> templ =
        ObjectTemplate::New(isolate, 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();
  ENTER_V8(isolate);
  Utils::OpenHandle(this)->set_length(length);
}


void FunctionTemplate::SetClassName(Handle<String> name) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  Utils::OpenHandle(this)->set_class_name(*Utils::OpenHandle(*name));
}


void FunctionTemplate::SetHiddenPrototype(bool value) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  Utils::OpenHandle(this)->set_hidden_prototype(value);
}


void FunctionTemplate::ReadOnlyPrototype() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  Utils::OpenHandle(this)->set_read_only_prototype(true);
}


void FunctionTemplate::RemovePrototype() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  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(Isolate* isolate) {
  return New(reinterpret_cast<i::Isolate*>(isolate), Local<FunctionTemplate>());
}


Local<ObjectTemplate> ObjectTemplate::New() {
  return New(i::Isolate::Current(), Local<FunctionTemplate>());
}


Local<ObjectTemplate> ObjectTemplate::New(
    i::Isolate* isolate,
    v8::Handle<FunctionTemplate> constructor) {
  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));
  obj->set_internal_field_count(i::Smi::FromInt(0));
  return Utils::ToLocal(obj);
}


// Ensure that the object template has a constructor.  If no
// constructor is available we create one.
static i::Handle<i::FunctionTemplateInfo> EnsureConstructor(
    i::Isolate* isolate,
    ObjectTemplate* object_template) {
  i::Object* obj = Utils::OpenHandle(object_template)->constructor();
  if (!obj ->IsUndefined()) {
    i::FunctionTemplateInfo* info = i::FunctionTemplateInfo::cast(obj);
    return i::Handle<i::FunctionTemplateInfo>(info, isolate);
  }
  Local<FunctionTemplate> templ =
      FunctionTemplate::New(reinterpret_cast<Isolate*>(isolate));
  i::Handle<i::FunctionTemplateInfo> constructor = Utils::OpenHandle(*templ);
  constructor->set_instance_template(*Utils::OpenHandle(object_template));
  Utils::OpenHandle(object_template)->set_constructor(*constructor);
  return constructor;
}


static inline void AddPropertyToTemplate(
    i::Handle<i::TemplateInfo> info,
    i::Handle<i::AccessorInfo> obj) {
  i::Isolate* isolate = info->GetIsolate();
  i::Handle<i::Object> list(info->property_accessors(), isolate);
  if (list->IsUndefined()) {
    list = NeanderArray(isolate).value();
    info->set_property_accessors(*list);
  }
  NeanderArray array(list);
  array.add(obj);
}


static inline i::Handle<i::TemplateInfo> GetTemplateInfo(
    i::Isolate* isolate,
    Template* template_obj) {
  return Utils::OpenHandle(template_obj);
}


// TODO(dcarney): remove this with ObjectTemplate::SetAccessor
static inline i::Handle<i::TemplateInfo> GetTemplateInfo(
    i::Isolate* isolate,
    ObjectTemplate* object_template) {
  EnsureConstructor(isolate, object_template);
  return Utils::OpenHandle(object_template);
}


template<typename Setter, typename Getter, typename Data, typename Template>
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();
  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(isolate, template_obj);
  AddPropertyToTemplate(info, obj);
  return true;
}


bool Template::SetDeclaredAccessor(
    Local<String> name,
    Local<DeclaredAccessorDescriptor> descriptor,
    PropertyAttribute attribute,
    Local<AccessorSignature> signature,
    AccessControl settings) {
  void* null = NULL;
  return TemplateSetAccessor(
      this, name, descriptor, null, null, settings, attribute, signature);
}


void Template::SetNativeDataProperty(v8::Local<String> name,
                                     AccessorGetterCallback getter,
                                     AccessorSetterCallback setter,
                                     v8::Handle<Value> data,
                                     PropertyAttribute attribute,
                                     v8::Local<AccessorSignature> signature,
                                     AccessControl settings) {
  TemplateSetAccessor(
      this, name, getter, setter, data, settings, attribute, signature);
}


void ObjectTemplate::SetAccessor(v8::Handle<String> name,
                                 AccessorGetterCallback getter,
                                 AccessorSetterCallback setter,
                                 v8::Handle<Value> data,
                                 AccessControl settings,
                                 PropertyAttribute attribute,
                                 v8::Handle<AccessorSignature> signature) {
  TemplateSetAccessor(
      this, name, getter, setter, data, settings, attribute, signature);
}


void ObjectTemplate::SetNamedPropertyHandler(
    NamedPropertyGetterCallback getter,
    NamedPropertySetterCallback setter,
    NamedPropertyQueryCallback query,
    NamedPropertyDeleterCallback remover,
    NamedPropertyEnumeratorCallback enumerator,
    Handle<Value> data) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  EnsureConstructor(isolate, 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(reinterpret_cast<v8::Isolate*>(isolate));
  }
  obj->set_data(*Utils::OpenHandle(*data));
  cons->set_named_property_handler(*obj);
}


void ObjectTemplate::MarkAsUndetectable() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  EnsureConstructor(isolate, 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();
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  EnsureConstructor(isolate, 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);
  SET_FIELD_WRAPPED(info, set_indexed_callback, indexed_callback);

  if (data.IsEmpty()) {
    data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
  }
  info->set_data(*Utils::OpenHandle(*data));

  i::FunctionTemplateInfo* constructor =
      i::FunctionTemplateInfo::cast(Utils::OpenHandle(this)->constructor());
  i::Handle<i::FunctionTemplateInfo> cons(constructor);
  cons->set_access_check_info(*info);
  cons->set_needs_access_check(turned_on_by_default);
}


void ObjectTemplate::SetIndexedPropertyHandler(
    IndexedPropertyGetterCallback getter,
    IndexedPropertySetterCallback setter,
    IndexedPropertyQueryCallback query,
    IndexedPropertyDeleterCallback remover,
    IndexedPropertyEnumeratorCallback enumerator,
    Handle<Value> data) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  EnsureConstructor(isolate, 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(reinterpret_cast<v8::Isolate*>(isolate));
  }
  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();
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  EnsureConstructor(isolate, 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(reinterpret_cast<v8::Isolate*>(isolate));
  }
  obj->set_data(*Utils::OpenHandle(*data));
  cons->set_instance_call_handler(*obj);
}


int ObjectTemplate::InternalFieldCount() {
  return i::Smi::cast(Utils::OpenHandle(this)->internal_field_count())->value();
}


void ObjectTemplate::SetInternalFieldCount(int value) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  if (!Utils::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.
    EnsureConstructor(isolate, this);
  }
  Utils::OpenHandle(this)->set_internal_field_count(i::Smi::FromInt(value));
}


// --- S c r i p t s ---


// Internally, UnboundScript is a SharedFunctionInfo, and Script is a
// JSFunction.

ScriptCompiler::CachedData::CachedData(const uint8_t* data_, int length_,
                                       BufferPolicy buffer_policy_)
    : data(data_), length(length_), buffer_policy(buffer_policy_) {}


ScriptCompiler::CachedData::~CachedData() {
  if (buffer_policy == BufferOwned) {
    delete[] data;
  }
}


Local<Script> UnboundScript::BindToCurrentContext() {
  i::Handle<i::HeapObject> obj =
      i::Handle<i::HeapObject>::cast(Utils::OpenHandle(this));
  i::Handle<i::SharedFunctionInfo>
      function_info(i::SharedFunctionInfo::cast(*obj), obj->GetIsolate());
  i::Handle<i::JSFunction> function =
      obj->GetIsolate()->factory()->NewFunctionFromSharedFunctionInfo(
          function_info, obj->GetIsolate()->global_context());
  return ToApiHandle<Script>(function);
}


int UnboundScript::GetId() {
  i::Handle<i::HeapObject> obj =
      i::Handle<i::HeapObject>::cast(Utils::OpenHandle(this));
  i::Isolate* isolate = obj->GetIsolate();
  ON_BAILOUT(isolate, "v8::UnboundScript::GetId()", return -1);
  LOG_API(isolate, "v8::UnboundScript::GetId");
  {
    i::HandleScope scope(isolate);
    i::Handle<i::SharedFunctionInfo> function_info(
        i::SharedFunctionInfo::cast(*obj));
    i::Handle<i::Script> script(i::Script::cast(function_info->script()));
    return script->id()->value();
  }
}


int UnboundScript::GetLineNumber(int code_pos) {
  i::Handle<i::SharedFunctionInfo> obj =
      i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
  i::Isolate* isolate = obj->GetIsolate();
  ON_BAILOUT(isolate, "v8::UnboundScript::GetLineNumber()", return -1);
  LOG_API(isolate, "UnboundScript::GetLineNumber");
  if (obj->script()->IsScript()) {
    i::Handle<i::Script> script(i::Script::cast(obj->script()));
    return i::Script::GetLineNumber(script, code_pos);
  } else {
    return -1;
  }
}


Handle<Value> UnboundScript::GetScriptName() {
  i::Handle<i::SharedFunctionInfo> obj =
      i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
  i::Isolate* isolate = obj->GetIsolate();
  ON_BAILOUT(isolate, "v8::UnboundScript::GetName()",
             return Handle<String>());
  LOG_API(isolate, "UnboundScript::GetName");
  if (obj->script()->IsScript()) {
    i::Object* name = i::Script::cast(obj->script())->name();
    return Utils::ToLocal(i::Handle<i::Object>(name, isolate));
  } else {
    return Handle<String>();
  }
}


Local<Value> Script::Run() {
  i::Handle<i::Object> obj = Utils::OpenHandle(this, true);
  // If execution is terminating, Compile(..)->Run() requires this
  // check.
  if (obj.is_null()) return Local<Value>();
  i::Isolate* isolate = i::Handle<i::HeapObject>::cast(obj)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Script::Run()", return Local<Value>());
  LOG_API(isolate, "Script::Run");
  ENTER_V8(isolate);
  i::Logger::TimerEventScope timer_scope(
      isolate, i::Logger::TimerEventScope::v8_execute);
  i::HandleScope scope(isolate);
  i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>::cast(obj);
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> receiver(
      isolate->context()->global_proxy(), isolate);
  i::Handle<i::Object> result;
  has_pending_exception = !i::Execution::Call(
      isolate, fun, receiver, 0, NULL).ToHandle(&result);
  EXCEPTION_BAILOUT_CHECK_DO_CALLBACK(isolate, Local<Value>());
  return Utils::ToLocal(scope.CloseAndEscape(result));
}


Local<UnboundScript> Script::GetUnboundScript() {
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  return ToApiHandle<UnboundScript>(
      i::Handle<i::SharedFunctionInfo>(i::JSFunction::cast(*obj)->shared()));
}


Local<UnboundScript> ScriptCompiler::CompileUnbound(
    Isolate* v8_isolate,
    Source* source,
    CompileOptions options) {
  i::ScriptData* script_data_impl = NULL;
  i::CachedDataMode cached_data_mode = i::NO_CACHED_DATA;
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  ON_BAILOUT(isolate, "v8::ScriptCompiler::CompileUnbound()",
             return Local<UnboundScript>());
  if (options & kProduceDataToCache) {
    cached_data_mode = i::PRODUCE_CACHED_DATA;
    ASSERT(source->cached_data == NULL);
    if (source->cached_data) {
      // Asked to produce cached data even though there is some already -> not
      // good. Fail the compilation.
      EXCEPTION_PREAMBLE(isolate);
      i::Handle<i::Object> result = isolate->factory()->NewSyntaxError(
          "invalid_cached_data", isolate->factory()->NewJSArray(0));
      isolate->Throw(*result);
      isolate->ReportPendingMessages();
      has_pending_exception = true;
      EXCEPTION_BAILOUT_CHECK(isolate, Local<UnboundScript>());
    }
  } else if (source->cached_data) {
    cached_data_mode = i::CONSUME_CACHED_DATA;
    // ScriptData takes care of aligning, in case the data is not aligned
    // correctly.
    script_data_impl = i::ScriptData::New(
        reinterpret_cast<const char*>(source->cached_data->data),
        source->cached_data->length);
    // If the cached data is not valid, fail the compilation.
    if (script_data_impl == NULL || !script_data_impl->SanityCheck()) {
      EXCEPTION_PREAMBLE(isolate);
      i::Handle<i::Object> result = isolate->factory()->NewSyntaxError(
          "invalid_cached_data", isolate->factory()->NewJSArray(0));
      isolate->Throw(*result);
      isolate->ReportPendingMessages();
      delete script_data_impl;
      has_pending_exception = true;
      EXCEPTION_BAILOUT_CHECK(isolate, Local<UnboundScript>());
    }
  }

  i::Handle<i::String> str = Utils::OpenHandle(*(source->source_string));
  LOG_API(isolate, "ScriptCompiler::CompileUnbound");
  ENTER_V8(isolate);
  i::SharedFunctionInfo* raw_result = NULL;
  { i::HandleScope scope(isolate);
    i::Handle<i::Object> name_obj;
    int line_offset = 0;
    int column_offset = 0;
    bool is_shared_cross_origin = false;
    if (!source->resource_name.IsEmpty()) {
      name_obj = Utils::OpenHandle(*(source->resource_name));
    }
    if (!source->resource_line_offset.IsEmpty()) {
      line_offset = static_cast<int>(source->resource_line_offset->Value());
    }
    if (!source->resource_column_offset.IsEmpty()) {
      column_offset =
          static_cast<int>(source->resource_column_offset->Value());
    }
    if (!source->resource_is_shared_cross_origin.IsEmpty()) {
      v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
      is_shared_cross_origin =
          source->resource_is_shared_cross_origin == v8::True(v8_isolate);
    }
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::SharedFunctionInfo> result =
        i::Compiler::CompileScript(str,
                                   name_obj,
                                   line_offset,
                                   column_offset,
                                   is_shared_cross_origin,
                                   isolate->global_context(),
                                   NULL,
                                   &script_data_impl,
                                   cached_data_mode,
                                   i::NOT_NATIVES_CODE);
    has_pending_exception = result.is_null();
    if (has_pending_exception && cached_data_mode == i::CONSUME_CACHED_DATA) {
      // This case won't happen during normal operation; we have compiled
      // successfully and produced cached data, and but the second compilation
      // of the same source code fails.
      delete script_data_impl;
      script_data_impl = NULL;
    }
    EXCEPTION_BAILOUT_CHECK(isolate, Local<UnboundScript>());
    raw_result = *result;
    if ((options & kProduceDataToCache) && script_data_impl != NULL) {
      // script_data_impl now contains the data that was generated. source will
      // take the ownership.
      source->cached_data = new CachedData(
          reinterpret_cast<const uint8_t*>(script_data_impl->Data()),
          script_data_impl->Length(), CachedData::BufferOwned);
      script_data_impl->owns_store_ = false;
    }
    delete script_data_impl;
  }
  i::Handle<i::SharedFunctionInfo> result(raw_result, isolate);
  return ToApiHandle<UnboundScript>(result);
}


Local<Script> ScriptCompiler::Compile(
    Isolate* v8_isolate,
    Source* source,
    CompileOptions options) {
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  ON_BAILOUT(isolate, "v8::ScriptCompiler::Compile()", return Local<Script>());
  LOG_API(isolate, "ScriptCompiler::CompiletBound()");
  ENTER_V8(isolate);
  Local<UnboundScript> generic = CompileUnbound(v8_isolate, source, options);
  if (generic.IsEmpty()) return Local<Script>();
  return generic->BindToCurrentContext();
}


Local<Script> Script::Compile(v8::Handle<String> source,
                              v8::ScriptOrigin* origin) {
  i::Handle<i::String> str = Utils::OpenHandle(*source);
  if (origin) {
    ScriptCompiler::Source script_source(source, *origin);
    return ScriptCompiler::Compile(
        reinterpret_cast<v8::Isolate*>(str->GetIsolate()),
        &script_source);
  }
  ScriptCompiler::Source script_source(source);
  return ScriptCompiler::Compile(
      reinterpret_cast<v8::Isolate*>(str->GetIsolate()),
      &script_source);
}


Local<Script> Script::Compile(v8::Handle<String> source,
                              v8::Handle<String> file_name) {
  ScriptOrigin origin(file_name);
  return Compile(source, &origin);
}


// --- E x c e p t i o n s ---


v8::TryCatch::TryCatch()
    : isolate_(i::Isolate::Current()),
      next_(isolate_->try_catch_handler()),
      is_verbose_(false),
      can_continue_(true),
      capture_message_(true),
      rethrow_(false),
      has_terminated_(false) {
  Reset();
  js_stack_comparable_address_ = this;
#ifdef V8_USE_ADDRESS_SANITIZER
  void* asan_fake_stack_handle = __asan_get_current_fake_stack();
  if (asan_fake_stack_handle != NULL) {
    js_stack_comparable_address_ = __asan_addr_is_in_fake_stack(
        asan_fake_stack_handle, js_stack_comparable_address_, NULL, NULL);
    CHECK(js_stack_comparable_address_ != NULL);
  }
#endif
  // Special handling for simulators which have a separate JS stack.
  js_stack_comparable_address_ = reinterpret_cast<void*>(
      v8::internal::SimulatorStack::RegisterCTryCatch(
          reinterpret_cast<uintptr_t>(js_stack_comparable_address_)));
  isolate_->RegisterTryCatchHandler(this);
}


v8::TryCatch::~TryCatch() {
  ASSERT(isolate_ == i::Isolate::Current());
  if (rethrow_) {
    v8::Isolate* isolate = reinterpret_cast<Isolate*>(isolate_);
    v8::HandleScope scope(isolate);
    v8::Local<v8::Value> exc = v8::Local<v8::Value>::New(isolate, Exception());
    if (HasCaught() && capture_message_) {
      // If an exception was caught and rethrow_ is indicated, the saved
      // message, script, and location need to be restored to Isolate TLS
      // for reuse.  capture_message_ needs to be disabled so that DoThrow()
      // does not create a new message.
      isolate_->thread_local_top()->rethrowing_message_ = true;
      isolate_->RestorePendingMessageFromTryCatch(this);
    }
    isolate_->UnregisterTryCatchHandler(this);
    v8::internal::SimulatorStack::UnregisterCTryCatch();
    reinterpret_cast<Isolate*>(isolate_)->ThrowException(exc);
    ASSERT(!isolate_->thread_local_top()->rethrowing_message_);
  } else {
    isolate_->UnregisterTryCatchHandler(this);
    v8::internal::SimulatorStack::UnregisterCTryCatch();
  }
}


bool v8::TryCatch::HasCaught() const {
  return !reinterpret_cast<i::Object*>(exception_)->IsTheHole();
}


bool v8::TryCatch::CanContinue() const {
  return can_continue_;
}


bool v8::TryCatch::HasTerminated() const {
  return has_terminated_;
}


v8::Handle<v8::Value> v8::TryCatch::ReThrow() {
  if (!HasCaught()) return v8::Local<v8::Value>();
  rethrow_ = true;
  return v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate_));
}


v8::Local<Value> v8::TryCatch::Exception() const {
  ASSERT(isolate_ == i::Isolate::Current());
  if (HasCaught()) {
    // Check for out of memory exception.
    i::Object* exception = reinterpret_cast<i::Object*>(exception_);
    return v8::Utils::ToLocal(i::Handle<i::Object>(exception, isolate_));
  } else {
    return v8::Local<Value>();
  }
}


v8::Local<Value> v8::TryCatch::StackTrace() const {
  ASSERT(isolate_ == i::Isolate::Current());
  if (HasCaught()) {
    i::Object* raw_obj = reinterpret_cast<i::Object*>(exception_);
    if (!raw_obj->IsJSObject()) return v8::Local<Value>();
    i::HandleScope scope(isolate_);
    i::Handle<i::JSObject> obj(i::JSObject::cast(raw_obj), isolate_);
    i::Handle<i::String> name = isolate_->factory()->stack_string();
    if (!i::JSReceiver::HasProperty(obj, name)) return v8::Local<Value>();
    i::Handle<i::Object> value;
    if (!i::Object::GetProperty(obj, name).ToHandle(&value)) {
      return v8::Local<Value>();
    }
    return v8::Utils::ToLocal(scope.CloseAndEscape(value));
  } else {
    return v8::Local<Value>();
  }
}


v8::Local<v8::Message> v8::TryCatch::Message() const {
  ASSERT(isolate_ == i::Isolate::Current());
  i::Object* message = reinterpret_cast<i::Object*>(message_obj_);
  ASSERT(message->IsJSMessageObject() || message->IsTheHole());
  if (HasCaught() && !message->IsTheHole()) {
    return v8::Utils::MessageToLocal(i::Handle<i::Object>(message, isolate_));
  } else {
    return v8::Local<v8::Message>();
  }
}


void v8::TryCatch::Reset() {
  ASSERT(isolate_ == i::Isolate::Current());
  i::Object* the_hole = isolate_->heap()->the_hole_value();
  exception_ = the_hole;
  message_obj_ = the_hole;
  message_script_ = the_hole;
  message_start_pos_ = 0;
  message_end_pos_ = 0;
}


void v8::TryCatch::SetVerbose(bool value) {
  is_verbose_ = value;
}


void v8::TryCatch::SetCaptureMessage(bool value) {
  capture_message_ = value;
}


// --- M e s s a g e ---


Local<String> Message::Get() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Message::Get()", return Local<String>());
  ENTER_V8(isolate);
  EscapableHandleScope 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.Escape(result);
}


v8::Handle<Value> Message::GetScriptResourceName() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  EscapableHandleScope 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.Escape(Utils::ToLocal(resource_name));
}


v8::Handle<v8::StackTrace> Message::GetStackTrace() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  EscapableHandleScope 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.Escape(Utils::StackTraceToLocal(stackTrace));
}


MUST_USE_RESULT static i::MaybeHandle<i::Object> CallV8HeapFunction(
    const char* name,
    i::Handle<i::Object> recv,
    int argc,
    i::Handle<i::Object> argv[]) {
  i::Isolate* isolate = i::Isolate::Current();
  i::Handle<i::Object> object_fun =
      i::Object::GetProperty(
          isolate, isolate->js_builtins_object(), name).ToHandleChecked();
  i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>::cast(object_fun);
  return i::Execution::Call(isolate, fun, recv, argc, argv);
}


MUST_USE_RESULT static i::MaybeHandle<i::Object> CallV8HeapFunction(
    const char* name,
    i::Handle<i::Object> data) {
  i::Handle<i::Object> argv[] = { data };
  return CallV8HeapFunction(name,
                            i::Isolate::Current()->js_builtins_object(),
                            ARRAY_SIZE(argv),
                            argv);
}


int Message::GetLineNumber() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Message::GetLineNumber()", return kNoLineNumberInfo);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);

  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> result;
  has_pending_exception = !CallV8HeapFunction(
      "GetLineNumber", Utils::OpenHandle(this)).ToHandle(&result);
  EXCEPTION_BAILOUT_CHECK(isolate, 0);
  return static_cast<int>(result->Number());
}


int Message::GetStartPosition() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  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();
  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();
  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;
  has_pending_exception = !CallV8HeapFunction(
      "GetPositionInLine", data_obj).ToHandle(&start_col_obj);
  EXCEPTION_BAILOUT_CHECK(isolate, 0);
  return static_cast<int>(start_col_obj->Number());
}


int Message::GetEndColumn() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  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;
  has_pending_exception = !CallV8HeapFunction(
      "GetPositionInLine", data_obj).ToHandle(&start_col_obj);
  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();
  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();
}


Local<String> Message::GetSourceLine() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Message::GetSourceLine()", return Local<String>());
  ENTER_V8(isolate);
  EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> result;
  has_pending_exception = !CallV8HeapFunction(
      "GetSourceLine", Utils::OpenHandle(this)).ToHandle(&result);
  EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::String>());
  if (result->IsString()) {
    return scope.Escape(Utils::ToLocal(i::Handle<i::String>::cast(result)));
  } else {
    return Local<String>();
  }
}


void Message::PrintCurrentStackTrace(Isolate* isolate, FILE* out) {
  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
  ENTER_V8(i_isolate);
  i_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();
  ENTER_V8(isolate);
  EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
  i::Handle<i::JSArray> self = Utils::OpenHandle(this);
  i::Handle<i::Object> obj =
      i::Object::GetElement(isolate, self, index).ToHandleChecked();
  i::Handle<i::JSObject> jsobj = i::Handle<i::JSObject>::cast(obj);
  return scope.Escape(Utils::StackFrameToLocal(jsobj));
}


int StackTrace::GetFrameCount() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  return i::Smi::cast(Utils::OpenHandle(this)->length())->value();
}


Local<Array> StackTrace::AsArray() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  return Utils::ToLocal(Utils::OpenHandle(this));
}


Local<StackTrace> StackTrace::CurrentStackTrace(
    Isolate* isolate,
    int frame_limit,
    StackTraceOptions options) {
  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
  ENTER_V8(i_isolate);
  // TODO(dcarney): remove when ScriptDebugServer is fixed.
  options = static_cast<StackTraceOptions>(
      static_cast<int>(options) | kExposeFramesAcrossSecurityOrigins);
  i::Handle<i::JSArray> stackTrace =
      i_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();
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> line = i::Object::GetProperty(
      isolate, self, "lineNumber").ToHandleChecked();
  if (!line->IsSmi()) {
    return Message::kNoLineNumberInfo;
  }
  return i::Smi::cast(*line)->value();
}


int StackFrame::GetColumn() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> column = i::Object::GetProperty(
      isolate, self, "column").ToHandleChecked();
  if (!column->IsSmi()) {
    return Message::kNoColumnInfo;
  }
  return i::Smi::cast(*column)->value();
}


int StackFrame::GetScriptId() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> scriptId = i::Object::GetProperty(
      isolate, self, "scriptId").ToHandleChecked();
  if (!scriptId->IsSmi()) {
    return Message::kNoScriptIdInfo;
  }
  return i::Smi::cast(*scriptId)->value();
}


Local<String> StackFrame::GetScriptName() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> name = i::Object::GetProperty(
      isolate, self, "scriptName").ToHandleChecked();
  if (!name->IsString()) {
    return Local<String>();
  }
  return scope.Escape(Local<String>::Cast(Utils::ToLocal(name)));
}


Local<String> StackFrame::GetScriptNameOrSourceURL() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> name = i::Object::GetProperty(
      isolate, self, "scriptNameOrSourceURL").ToHandleChecked();
  if (!name->IsString()) {
    return Local<String>();
  }
  return scope.Escape(Local<String>::Cast(Utils::ToLocal(name)));
}


Local<String> StackFrame::GetFunctionName() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> name = i::Object::GetProperty(
      isolate, self, "functionName").ToHandleChecked();
  if (!name->IsString()) {
    return Local<String>();
  }
  return scope.Escape(Local<String>::Cast(Utils::ToLocal(name)));
}


bool StackFrame::IsEval() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> is_eval = i::Object::GetProperty(
      isolate, self, "isEval").ToHandleChecked();
  return is_eval->IsTrue();
}


bool StackFrame::IsConstructor() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> is_constructor = i::Object::GetProperty(
      isolate, self, "isConstructor").ToHandleChecked();
  return is_constructor->IsTrue();
}


// --- J S O N ---

Local<Value> JSON::Parse(Local<String> json_string) {
  i::Handle<i::String> string = Utils::OpenHandle(*json_string);
  i::Isolate* isolate = string->GetIsolate();
  EnsureInitializedForIsolate(isolate, "v8::JSON::Parse");
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::String> source = i::String::Flatten(string);
  EXCEPTION_PREAMBLE(isolate);
  i::MaybeHandle<i::Object> maybe_result =
      source->IsSeqOneByteString() ? i::JsonParser<true>::Parse(source)
                                   : i::JsonParser<false>::Parse(source);
  i::Handle<i::Object> result;
  has_pending_exception = !maybe_result.ToHandle(&result);
  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 {
  bool result = Utils::OpenHandle(this)->IsUndefined();
  ASSERT_EQ(result, QuickIsUndefined());
  return result;
}


bool Value::FullIsNull() const {
  bool result = Utils::OpenHandle(this)->IsNull();
  ASSERT_EQ(result, QuickIsNull());
  return result;
}


bool Value::IsTrue() const {
  return Utils::OpenHandle(this)->IsTrue();
}


bool Value::IsFalse() const {
  return Utils::OpenHandle(this)->IsFalse();
}


bool Value::IsFunction() const {
  return Utils::OpenHandle(this)->IsJSFunction();
}


bool Value::FullIsString() const {
  bool result = Utils::OpenHandle(this)->IsString();
  ASSERT_EQ(result, QuickIsString());
  return result;
}


bool Value::IsSymbol() const {
  return Utils::OpenHandle(this)->IsSymbol();
}


bool Value::IsArray() const {
  return Utils::OpenHandle(this)->IsJSArray();
}


bool Value::IsArrayBuffer() const {
  return Utils::OpenHandle(this)->IsJSArrayBuffer();
}


bool Value::IsArrayBufferView() const {
  return Utils::OpenHandle(this)->IsJSArrayBufferView();
}


bool Value::IsTypedArray() const {
  return Utils::OpenHandle(this)->IsJSTypedArray();
}


#define VALUE_IS_TYPED_ARRAY(Type, typeName, TYPE, ctype, size)            \
  bool Value::Is##Type##Array() const {                                    \
    i::Handle<i::Object> obj = Utils::OpenHandle(this);                    \
    return obj->IsJSTypedArray() &&                                        \
           i::JSTypedArray::cast(*obj)->type() == kExternal##Type##Array;  \
  }

TYPED_ARRAYS(VALUE_IS_TYPED_ARRAY)

#undef VALUE_IS_TYPED_ARRAY


bool Value::IsDataView() const {
  return Utils::OpenHandle(this)->IsJSDataView();
}


bool Value::IsObject() const {
  return Utils::OpenHandle(this)->IsJSObject();
}


bool Value::IsNumber() const {
  return Utils::OpenHandle(this)->IsNumber();
}


bool Value::IsBoolean() const {
  return Utils::OpenHandle(this)->IsBoolean();
}


bool Value::IsExternal() const {
  return Utils::OpenHandle(this)->IsExternal();
}


bool Value::IsInt32() const {
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  if (obj->IsSmi()) return true;
  if (obj->IsNumber()) {
    return i::IsInt32Double(obj->Number());
  }
  return false;
}


bool Value::IsUint32() const {
  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();
    return !i::IsMinusZero(value) &&
        value >= 0 &&
        value <= i::kMaxUInt32 &&
        value == i::FastUI2D(i::FastD2UI(value));
  }
  return false;
}


bool Value::IsDate() const {
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  if (!obj->IsHeapObject()) return false;
  i::Isolate* isolate = i::HeapObject::cast(*obj)->GetIsolate();
  return obj->HasSpecificClassOf(isolate->heap()->Date_string());
}


bool Value::IsStringObject() const {
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  if (!obj->IsHeapObject()) return false;
  i::Isolate* isolate = i::HeapObject::cast(*obj)->GetIsolate();
  return obj->HasSpecificClassOf(isolate->heap()->String_string());
}


bool Value::IsSymbolObject() const {
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  if (!obj->IsHeapObject()) return false;
  i::Isolate* isolate = i::HeapObject::cast(*obj)->GetIsolate();
  return obj->HasSpecificClassOf(isolate->heap()->Symbol_string());
}


bool Value::IsNumberObject() const {
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  if (!obj->IsHeapObject()) return false;
  i::Isolate* isolate = i::HeapObject::cast(*obj)->GetIsolate();
  return obj->HasSpecificClassOf(isolate->heap()->Number_string());
}


static bool CheckConstructor(i::Isolate* isolate,
                             i::Handle<i::JSObject> obj,
                             const char* class_name) {
  i::Handle<i::Object> constr(obj->map()->constructor(), isolate);
  if (!constr->IsJSFunction()) return false;
  i::Handle<i::JSFunction> func = i::Handle<i::JSFunction>::cast(constr);
  return func->shared()->native() && constr.is_identical_to(
      i::Object::GetProperty(isolate,
                             isolate->js_builtins_object(),
                             class_name).ToHandleChecked());
}


bool Value::IsNativeError() const {
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  if (obj->IsJSObject()) {
    i::Handle<i::JSObject> js_obj(i::JSObject::cast(*obj));
    i::Isolate* isolate = js_obj->GetIsolate();
    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::Handle<i::Object> obj = Utils::OpenHandle(this);
  if (!obj->IsHeapObject()) return false;
  i::Isolate* isolate = i::HeapObject::cast(*obj)->GetIsolate();
  return obj->HasSpecificClassOf(isolate->heap()->Boolean_string());
}


bool Value::IsRegExp() const {
  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();
    LOG_API(isolate, "ToString");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    has_pending_exception = !i::Execution::ToString(
        isolate, obj).ToHandle(&str);
    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();
    LOG_API(isolate, "ToDetailString");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    has_pending_exception = !i::Execution::ToDetailString(
        isolate, obj).ToHandle(&str);
    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();
    LOG_API(isolate, "ToObject");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    has_pending_exception = !i::Execution::ToObject(
        isolate, obj).ToHandle(&val);
    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();
    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::HeapObject::cast(*obj)->GetIsolate();
    LOG_API(isolate, "ToNumber");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    has_pending_exception = !i::Execution::ToNumber(
        isolate, obj).ToHandle(&num);
    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::HeapObject::cast(*obj)->GetIsolate();
    LOG_API(isolate, "ToInteger");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    has_pending_exception = !i::Execution::ToInteger(
        isolate, obj).ToHandle(&num);
    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);
  Utils::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) {
  Utils::ApiCheck(Utils::OpenHandle(that)->IsExternal(),
                  "v8::External::Cast()",
                  "Could not convert to external");
}


void v8::Object::CheckCast(Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::ApiCheck(obj->IsJSObject(),
                  "v8::Object::Cast()",
                  "Could not convert to object");
}


void v8::Function::CheckCast(Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::ApiCheck(obj->IsJSFunction(),
                  "v8::Function::Cast()",
                  "Could not convert to function");
}


void v8::String::CheckCast(v8::Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::ApiCheck(obj->IsString(),
                  "v8::String::Cast()",
                  "Could not convert to string");
}


void v8::Symbol::CheckCast(v8::Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::ApiCheck(obj->IsSymbol(),
                  "v8::Symbol::Cast()",
                  "Could not convert to symbol");
}


void v8::Number::CheckCast(v8::Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::ApiCheck(obj->IsNumber(),
                  "v8::Number::Cast()",
                  "Could not convert to number");
}


void v8::Integer::CheckCast(v8::Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::ApiCheck(obj->IsNumber(),
                  "v8::Integer::Cast()",
                  "Could not convert to number");
}


void v8::Array::CheckCast(Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::ApiCheck(obj->IsJSArray(),
                  "v8::Array::Cast()",
                  "Could not convert to array");
}


void v8::Promise::CheckCast(Value* that) {
  Utils::ApiCheck(that->IsPromise(),
                  "v8::Promise::Cast()",
                  "Could not convert to promise");
}


void v8::Promise::Resolver::CheckCast(Value* that) {
  Utils::ApiCheck(that->IsPromise(),
                  "v8::Promise::Resolver::Cast()",
                  "Could not convert to promise resolver");
}


void v8::ArrayBuffer::CheckCast(Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::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);
  Utils::ApiCheck(obj->IsJSArrayBufferView(),
                  "v8::ArrayBufferView::Cast()",
                  "Could not convert to ArrayBufferView");
}


void v8::TypedArray::CheckCast(Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::ApiCheck(obj->IsJSTypedArray(),
                  "v8::TypedArray::Cast()",
                  "Could not convert to TypedArray");
}


#define CHECK_TYPED_ARRAY_CAST(Type, typeName, TYPE, ctype, size)             \
  void v8::Type##Array::CheckCast(Value* that) {                              \
    i::Handle<i::Object> obj = Utils::OpenHandle(that);                       \
    Utils::ApiCheck(obj->IsJSTypedArray() &&                                  \
                    i::JSTypedArray::cast(*obj)->type() ==                    \
                        kExternal##Type##Array,                               \
                    "v8::" #Type "Array::Cast()",                             \
                    "Could not convert to " #Type "Array");                   \
  }


TYPED_ARRAYS(CHECK_TYPED_ARRAY_CAST)

#undef CHECK_TYPED_ARRAY_CAST


void v8::DataView::CheckCast(Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::ApiCheck(obj->IsJSDataView(),
                  "v8::DataView::Cast()",
                  "Could not convert to DataView");
}


void v8::Date::CheckCast(v8::Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  i::Isolate* isolate = NULL;
  if (obj->IsHeapObject()) isolate = i::HeapObject::cast(*obj)->GetIsolate();
  Utils::ApiCheck(isolate != NULL &&
                  obj->HasSpecificClassOf(isolate->heap()->Date_string()),
                  "v8::Date::Cast()",
                  "Could not convert to date");
}


void v8::StringObject::CheckCast(v8::Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  i::Isolate* isolate = NULL;
  if (obj->IsHeapObject()) isolate = i::HeapObject::cast(*obj)->GetIsolate();
  Utils::ApiCheck(isolate != NULL &&
                  obj->HasSpecificClassOf(isolate->heap()->String_string()),
                  "v8::StringObject::Cast()",
                  "Could not convert to StringObject");
}


void v8::SymbolObject::CheckCast(v8::Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  i::Isolate* isolate = NULL;
  if (obj->IsHeapObject()) isolate = i::HeapObject::cast(*obj)->GetIsolate();
  Utils::ApiCheck(isolate != NULL &&
                  obj->HasSpecificClassOf(isolate->heap()->Symbol_string()),
                  "v8::SymbolObject::Cast()",
                  "Could not convert to SymbolObject");
}


void v8::NumberObject::CheckCast(v8::Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  i::Isolate* isolate = NULL;
  if (obj->IsHeapObject()) isolate = i::HeapObject::cast(*obj)->GetIsolate();
  Utils::ApiCheck(isolate != NULL &&
                  obj->HasSpecificClassOf(isolate->heap()->Number_string()),
                  "v8::NumberObject::Cast()",
                  "Could not convert to NumberObject");
}


void v8::BooleanObject::CheckCast(v8::Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  i::Isolate* isolate = NULL;
  if (obj->IsHeapObject()) isolate = i::HeapObject::cast(*obj)->GetIsolate();
  Utils::ApiCheck(isolate != NULL &&
                  obj->HasSpecificClassOf(isolate->heap()->Boolean_string()),
                  "v8::BooleanObject::Cast()",
                  "Could not convert to BooleanObject");
}


void v8::RegExp::CheckCast(v8::Value* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::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::HeapObject::cast(*obj)->GetIsolate();
    LOG_API(isolate, "NumberValue");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    has_pending_exception = !i::Execution::ToNumber(
        isolate, obj).ToHandle(&num);
    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::HeapObject::cast(*obj)->GetIsolate();
    LOG_API(isolate, "IntegerValue");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    has_pending_exception = !i::Execution::ToInteger(
        isolate, obj).ToHandle(&num);
    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::HeapObject::cast(*obj)->GetIsolate();
    LOG_API(isolate, "ToInt32");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    has_pending_exception = !i::Execution::ToInt32(isolate, obj).ToHandle(&num);
    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::HeapObject::cast(*obj)->GetIsolate();
    LOG_API(isolate, "ToUInt32");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    has_pending_exception = !i::Execution::ToUint32(
        isolate, obj).ToHandle(&num);
    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::HeapObject::cast(*obj)->GetIsolate();
  LOG_API(isolate, "ToArrayIndex");
  ENTER_V8(isolate);
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> string_obj;
  has_pending_exception = !i::Execution::ToString(
      isolate, obj).ToHandle(&string_obj);
  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::HeapObject::cast(*obj)->GetIsolate();
    LOG_API(isolate, "Int32Value (slow)");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> num;
    has_pending_exception = !i::Execution::ToInt32(isolate, obj).ToHandle(&num);
    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();
  i::Handle<i::Object> obj = Utils::OpenHandle(this, true);
  if (!Utils::ApiCheck(!obj.is_null() && !that.IsEmpty(),
                       "v8::Value::Equals()",
                       "Reading from empty handle")) {
    return false;
  }
  LOG_API(isolate, "Equals");
  ENTER_V8(isolate);
  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;
  has_pending_exception = !CallV8HeapFunction(
      "EQUALS", obj, ARRAY_SIZE(args), args).ToHandle(&result);
  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();
  i::Handle<i::Object> obj = Utils::OpenHandle(this, true);
  if (!Utils::ApiCheck(!obj.is_null() && !that.IsEmpty(),
                       "v8::Value::StrictEquals()",
                       "Reading from empty handle")) {
    return false;
  }
  LOG_API(isolate, "StrictEquals");
  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();
    // Must check explicitly for NaN:s on Windows, but -0 works fine.
    return x == y && !std::isnan(x) && !std::isnan(y);
  } else if (*obj == *other) {  // Also covers Booleans.
    return true;
  } else if (obj->IsSmi()) {
    return other->IsNumber() && obj->Number() == other->Number();
  } else if (obj->IsString()) {
    return other->IsString() &&
        i::String::Equals(i::Handle<i::String>::cast(obj),
                          i::Handle<i::String>::cast(other));
  } else if (obj->IsUndefined() || obj->IsUndetectableObject()) {
    return other->IsUndefined() || other->IsUndetectableObject();
  } else {
    return false;
  }
}


bool Value::SameValue(Handle<Value> that) const {
  i::Handle<i::Object> obj = Utils::OpenHandle(this, true);
  if (!Utils::ApiCheck(!obj.is_null() && !that.IsEmpty(),
                       "v8::Value::SameValue()",
                       "Reading from empty handle")) {
    return false;
  }
  i::Handle<i::Object> other = Utils::OpenHandle(*that);
  return obj->SameValue(*other);
}


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::HeapObject::cast(*obj)->GetIsolate();
    LOG_API(isolate, "Uint32Value");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> num;
    has_pending_exception = !i::Execution::ToUint32(
        isolate, obj).ToHandle(&num);
    EXCEPTION_BAILOUT_CHECK(isolate, 0);
    if (num->IsSmi()) {
      return i::Smi::cast(*num)->value();
    } else {
      return static_cast<uint32_t>(num->Number());
    }
  }
}


bool v8::Object::Set(v8::Handle<Value> key, v8::Handle<Value> value,
                     v8::PropertyAttribute attribs) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::Set()", return false);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::Object> self = Utils::OpenHandle(this);
  i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
  i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
  EXCEPTION_PREAMBLE(isolate);
  has_pending_exception = i::Runtime::SetObjectProperty(
      isolate,
      self,
      key_obj,
      value_obj,
      static_cast<PropertyAttributes>(attribs),
      i::SLOPPY).is_null();
  EXCEPTION_BAILOUT_CHECK(isolate, false);
  return true;
}


bool v8::Object::Set(uint32_t index, v8::Handle<Value> value) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::Set()", return false);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
  EXCEPTION_PREAMBLE(isolate);
  has_pending_exception = i::JSObject::SetElement(
      self, index, value_obj, NONE, i::SLOPPY).is_null();
  EXCEPTION_BAILOUT_CHECK(isolate, false);
  return true;
}


bool v8::Object::ForceSet(v8::Handle<Value> key,
                          v8::Handle<Value> value,
                          v8::PropertyAttribute attribs) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::ForceSet()", return false);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
  i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
  EXCEPTION_PREAMBLE(isolate);
  has_pending_exception = i::Runtime::ForceSetObjectProperty(
      self,
      key_obj,
      value_obj,
      static_cast<PropertyAttributes>(attribs)).is_null();
  EXCEPTION_BAILOUT_CHECK(isolate, false);
  return true;
}


bool v8::Object::SetPrivate(v8::Handle<Private> key, v8::Handle<Value> value) {
  return ForceSet(v8::Handle<Value>(reinterpret_cast<Value*>(*key)),
                  value, DontEnum);
}


bool v8::Object::ForceDelete(v8::Handle<Value> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::ForceDelete()", return false);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);

  // When deleting a property on the global object using ForceDelete
  // deoptimize all functions as optimized code does not check for the hole
  // value with DontDelete properties.  We have to deoptimize all contexts
  // because of possible cross-context inlined functions.
  if (self->IsJSGlobalProxy() || self->IsGlobalObject()) {
    i::Deoptimizer::DeoptimizeAll(isolate);
  }

  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> obj;
  has_pending_exception = !i::Runtime::DeleteObjectProperty(
      isolate, self, key_obj, i::JSReceiver::FORCE_DELETION).ToHandle(&obj);
  EXCEPTION_BAILOUT_CHECK(isolate, false);
  return obj->IsTrue();
}


Local<Value> v8::Object::Get(v8::Handle<Value> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::Get()", return Local<v8::Value>());
  ENTER_V8(isolate);
  i::Handle<i::Object> self = Utils::OpenHandle(this);
  i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> result;
  has_pending_exception =
      !i::Runtime::GetObjectProperty(isolate, self, key_obj).ToHandle(&result);
  EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
  return Utils::ToLocal(result);
}


Local<Value> v8::Object::Get(uint32_t index) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::Get()", return Local<v8::Value>());
  ENTER_V8(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> result;
  has_pending_exception =
      !i::Object::GetElement(isolate, self, index).ToHandle(&result);
  EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
  return Utils::ToLocal(result);
}


Local<Value> v8::Object::GetPrivate(v8::Handle<Private> key) {
  return Get(v8::Handle<Value>(reinterpret_cast<Value*>(*key)));
}


PropertyAttribute v8::Object::GetPropertyAttributes(v8::Handle<Value> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::GetPropertyAttributes()",
             return static_cast<PropertyAttribute>(NONE));
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
  if (!key_obj->IsName()) {
    EXCEPTION_PREAMBLE(isolate);
    has_pending_exception = !i::Execution::ToString(
        isolate, key_obj).ToHandle(&key_obj);
    EXCEPTION_BAILOUT_CHECK(isolate, static_cast<PropertyAttribute>(NONE));
  }
  i::Handle<i::Name> key_name = i::Handle<i::Name>::cast(key_obj);
  PropertyAttributes result =
      i::JSReceiver::GetPropertyAttributes(self, key_name);
  if (result == ABSENT) return static_cast<PropertyAttribute>(NONE);
  return static_cast<PropertyAttribute>(result);
}


Local<Value> v8::Object::GetPrototype() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::GetPrototype()", return Local<v8::Value>());
  ENTER_V8(isolate);
  i::Handle<i::Object> self = Utils::OpenHandle(this);
  i::Handle<i::Object> result(self->GetPrototype(isolate), isolate);
  return Utils::ToLocal(result);
}


bool v8::Object::SetPrototype(Handle<Value> value) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::SetPrototype()", return false);
  ENTER_V8(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
  // We do not allow exceptions thrown while setting the prototype
  // to propagate outside.
  TryCatch try_catch;
  EXCEPTION_PREAMBLE(isolate);
  i::MaybeHandle<i::Object> result = i::JSObject::SetPrototype(
      self, value_obj);
  has_pending_exception = result.is_null();
  EXCEPTION_BAILOUT_CHECK(isolate, false);
  return true;
}


Local<Object> v8::Object::FindInstanceInPrototypeChain(
    v8::Handle<FunctionTemplate> tmpl) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate,
             "v8::Object::FindInstanceInPrototypeChain()",
             return Local<v8::Object>());
  ENTER_V8(isolate);
  i::JSObject* object = *Utils::OpenHandle(this);
  i::FunctionTemplateInfo* tmpl_info = *Utils::OpenHandle(*tmpl);
  while (!tmpl_info->IsTemplateFor(object)) {
    i::Object* prototype = object->GetPrototype();
    if (!prototype->IsJSObject()) return Local<Object>();
    object = i::JSObject::cast(prototype);
  }
  return Utils::ToLocal(i::Handle<i::JSObject>(object));
}


Local<Array> v8::Object::GetPropertyNames() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::GetPropertyNames()",
             return Local<v8::Array>());
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::FixedArray> value;
  has_pending_exception = !i::JSReceiver::GetKeys(
      self, i::JSReceiver::INCLUDE_PROTOS).ToHandle(&value);
  EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Array>());
  // Because we use caching to speed up enumeration it is important
  // to never change the result of the basic enumeration function so
  // we clone the result.
  i::Handle<i::FixedArray> elms = isolate->factory()->CopyFixedArray(value);
  i::Handle<i::JSArray> result =
      isolate->factory()->NewJSArrayWithElements(elms);
  return Utils::ToLocal(scope.CloseAndEscape(result));
}


Local<Array> v8::Object::GetOwnPropertyNames() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::GetOwnPropertyNames()",
             return Local<v8::Array>());
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::FixedArray> value;
  has_pending_exception = !i::JSReceiver::GetKeys(
      self, i::JSReceiver::OWN_ONLY).ToHandle(&value);
  EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Array>());
  // Because we use caching to speed up enumeration it is important
  // to never change the result of the basic enumeration function so
  // we clone the result.
  i::Handle<i::FixedArray> elms = isolate->factory()->CopyFixedArray(value);
  i::Handle<i::JSArray> result =
      isolate->factory()->NewJSArrayWithElements(elms);
  return Utils::ToLocal(scope.CloseAndEscape(result));
}


Local<String> v8::Object::ObjectProtoToString() {
  i::Isolate* i_isolate = Utils::OpenHandle(this)->GetIsolate();
  Isolate* isolate = reinterpret_cast<Isolate*>(i_isolate);
  ON_BAILOUT(i_isolate, "v8::Object::ObjectProtoToString()",
             return Local<v8::String>());
  ENTER_V8(i_isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);

  i::Handle<i::Object> name(self->class_name(), i_isolate);

  // Native implementation of Object.prototype.toString (v8natives.js):
  //   var c = %_ClassOf(this);
  //   if (c === 'Arguments') c  = 'Object';
  //   return "[object " + c + "]";

  if (!name->IsString()) {
    return v8::String::NewFromUtf8(isolate, "[object ]");
  } else {
    i::Handle<i::String> class_name = i::Handle<i::String>::cast(name);
    if (class_name->IsOneByteEqualTo(STATIC_ASCII_VECTOR("Arguments"))) {
      return v8::String::NewFromUtf8(isolate, "[object Object]");
    } else {
      const char* prefix = "[object ";
      Local<String> str = Utils::ToLocal(class_name);
      const char* postfix = "]";

      int prefix_len = i::StrLength(prefix);
      int str_len = str->Utf8Length();
      int postfix_len = i::StrLength(postfix);

      int buf_len = prefix_len + str_len + postfix_len;
      i::ScopedVector<char> buf(buf_len);

      // Write prefix.
      char* ptr = buf.start();
      i::MemCopy(ptr, prefix, prefix_len * v8::internal::kCharSize);
      ptr += prefix_len;

      // Write real content.
      str->WriteUtf8(ptr, str_len);
      ptr += str_len;

      // Write postfix.
      i::MemCopy(ptr, postfix, postfix_len * v8::internal::kCharSize);

      // Copy the buffer into a heap-allocated string and return it.
      Local<String> result = v8::String::NewFromUtf8(
          isolate, buf.start(), String::kNormalString, buf_len);
      return result;
    }
  }
}


Local<Value> v8::Object::GetConstructor() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::GetConstructor()",
             return Local<v8::Function>());
  ENTER_V8(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> constructor(self->GetConstructor(), isolate);
  return Utils::ToLocal(constructor);
}


Local<String> v8::Object::GetConstructorName() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::GetConstructorName()",
             return Local<v8::String>());
  ENTER_V8(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::String> name(self->constructor_name());
  return Utils::ToLocal(name);
}


bool v8::Object::Delete(v8::Handle<Value> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::Delete()", return false);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> obj;
  has_pending_exception = !i::Runtime::DeleteObjectProperty(
      isolate, self, key_obj, i::JSReceiver::NORMAL_DELETION).ToHandle(&obj);
  EXCEPTION_BAILOUT_CHECK(isolate, false);
  return obj->IsTrue();
}


bool v8::Object::DeletePrivate(v8::Handle<Private> key) {
  return Delete(v8::Handle<Value>(reinterpret_cast<Value*>(*key)));
}


bool v8::Object::Has(v8::Handle<Value> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::Has()", return false);
  ENTER_V8(isolate);
  i::Handle<i::JSReceiver> self = Utils::OpenHandle(this);
  i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> obj;
  has_pending_exception = !i::Runtime::HasObjectProperty(
      isolate, self, key_obj).ToHandle(&obj);
  EXCEPTION_BAILOUT_CHECK(isolate, false);
  return obj->IsTrue();
}


bool v8::Object::HasPrivate(v8::Handle<Private> key) {
  // TODO(rossberg): this should use HasOwnProperty, but we'd need to
  // generalise that to a (noy yet existant) Name argument first.
  return Has(v8::Handle<Value>(reinterpret_cast<Value*>(*key)));
}


bool v8::Object::Delete(uint32_t index) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::DeleteProperty()",
             return false);
  ENTER_V8(isolate);
  HandleScope scope(reinterpret_cast<Isolate*>(isolate));
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);

  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> obj;
  has_pending_exception =
      !i::JSReceiver::DeleteElement(self, index).ToHandle(&obj);
  EXCEPTION_BAILOUT_CHECK(isolate, false);
  return obj->IsTrue();
}


bool v8::Object::Has(uint32_t index) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::HasProperty()", return false);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  return i::JSReceiver::HasElement(self, index);
}


template<typename Setter, typename Getter, typename Data>
static inline bool ObjectSetAccessor(Object* obj,
                                     Handle<String> name,
                                     Setter getter,
                                     Getter setter,
                                     Data data,
                                     AccessControl settings,
                                     PropertyAttribute attributes) {
  i::Isolate* isolate = Utils::OpenHandle(obj)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::SetAccessor()", return false);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  v8::Handle<AccessorSignature> signature;
  i::Handle<i::AccessorInfo> info = MakeAccessorInfo(
      name, getter, setter, data, settings, attributes, signature);
  if (info.is_null()) return false;
  bool fast = Utils::OpenHandle(obj)->HasFastProperties();
  i::Handle<i::Object> result;
  ASSIGN_RETURN_ON_EXCEPTION_VALUE(
      isolate, result,
      i::JSObject::SetAccessor(Utils::OpenHandle(obj), info),
      false);
  if (result->IsUndefined()) return false;
  if (fast) i::JSObject::TransformToFastProperties(Utils::OpenHandle(obj), 0);
  return true;
}


bool Object::SetAccessor(Handle<String> name,
                         AccessorGetterCallback getter,
                         AccessorSetterCallback setter,
                         v8::Handle<Value> data,
                         AccessControl settings,
                         PropertyAttribute attributes) {
  return ObjectSetAccessor(
      this, name, getter, setter, data, settings, attributes);
}


bool Object::SetDeclaredAccessor(Local<String> name,
                                 Local<DeclaredAccessorDescriptor> descriptor,
                                 PropertyAttribute attributes,
                                 AccessControl settings) {
  void* null = NULL;
  return ObjectSetAccessor(
      this, name, descriptor, null, null, settings, attributes);
}


void Object::SetAccessorProperty(Local<String> name,
                                 Local<Function> getter,
                                 Handle<Function> setter,
                                 PropertyAttribute attribute,
                                 AccessControl settings) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::SetAccessorProperty()", return);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::Object> getter_i = v8::Utils::OpenHandle(*getter);
  i::Handle<i::Object> setter_i = v8::Utils::OpenHandle(*setter, true);
  if (setter_i.is_null()) setter_i = isolate->factory()->null_value();
  i::JSObject::DefineAccessor(v8::Utils::OpenHandle(this),
                              v8::Utils::OpenHandle(*name),
                              getter_i,
                              setter_i,
                              static_cast<PropertyAttributes>(attribute),
                              settings);
}


bool v8::Object::HasOwnProperty(Handle<String> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::HasOwnProperty()",
             return false);
  return i::JSReceiver::HasOwnProperty(
      Utils::OpenHandle(this), Utils::OpenHandle(*key));
}


bool v8::Object::HasRealNamedProperty(Handle<String> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::HasRealNamedProperty()",
             return false);
  return i::JSObject::HasRealNamedProperty(Utils::OpenHandle(this),
                                           Utils::OpenHandle(*key));
}


bool v8::Object::HasRealIndexedProperty(uint32_t index) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::HasRealIndexedProperty()",
             return false);
  return i::JSObject::HasRealElementProperty(Utils::OpenHandle(this), index);
}


bool v8::Object::HasRealNamedCallbackProperty(Handle<String> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate,
             "v8::Object::HasRealNamedCallbackProperty()",
             return false);
  ENTER_V8(isolate);
  return i::JSObject::HasRealNamedCallbackProperty(Utils::OpenHandle(this),
                                                   Utils::OpenHandle(*key));
}


bool v8::Object::HasNamedLookupInterceptor() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::HasNamedLookupInterceptor()",
             return false);
  return Utils::OpenHandle(this)->HasNamedInterceptor();
}


bool v8::Object::HasIndexedLookupInterceptor() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::HasIndexedLookupInterceptor()",
             return false);
  return Utils::OpenHandle(this)->HasIndexedInterceptor();
}


static Local<Value> GetPropertyByLookup(i::Isolate* isolate,
                                        i::Handle<i::JSObject> receiver,
                                        i::Handle<i::String> name,
                                        i::LookupResult* lookup) {
  if (!lookup->IsProperty()) {
    // No real property was found.
    return Local<Value>();
  }

  // If the property being looked up is a callback, it can throw
  // an exception.
  EXCEPTION_PREAMBLE(isolate);
  i::LookupIterator it(
      receiver, name, i::Handle<i::JSReceiver>(lookup->holder(), isolate),
      i::LookupIterator::SKIP_INTERCEPTOR);
  i::Handle<i::Object> result;
  has_pending_exception = !i::Object::GetProperty(&it).ToHandle(&result);
  EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());

  return Utils::ToLocal(result);
}


Local<Value> v8::Object::GetRealNamedPropertyInPrototypeChain(
    Handle<String> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate,
             "v8::Object::GetRealNamedPropertyInPrototypeChain()",
             return Local<Value>());
  ENTER_V8(isolate);
  i::Handle<i::JSObject> self_obj = Utils::OpenHandle(this);
  i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
  i::LookupResult lookup(isolate);
  self_obj->LookupRealNamedPropertyInPrototypes(key_obj, &lookup);
  return GetPropertyByLookup(isolate, self_obj, key_obj, &lookup);
}


Local<Value> v8::Object::GetRealNamedProperty(Handle<String> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::GetRealNamedProperty()",
             return Local<Value>());
  ENTER_V8(isolate);
  i::Handle<i::JSObject> self_obj = Utils::OpenHandle(this);
  i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
  i::LookupResult lookup(isolate);
  self_obj->LookupRealNamedProperty(key_obj, &lookup);
  return GetPropertyByLookup(isolate, self_obj, key_obj, &lookup);
}


// Turns on access checks by copying the map and setting the check flag.
// Because the object gets a new map, existing inline cache caching
// the old map of this object will fail.
void v8::Object::TurnOnAccessCheck() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::TurnOnAccessCheck()", return);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);

  // When turning on access checks for a global object deoptimize all functions
  // as optimized code does not always handle access checks.
  i::Deoptimizer::DeoptimizeGlobalObject(*obj);

  i::Handle<i::Map> new_map = i::Map::Copy(i::Handle<i::Map>(obj->map()));
  new_map->set_is_access_check_needed(true);
  obj->set_map(*new_map);
}


bool v8::Object::IsDirty() {
  return Utils::OpenHandle(this)->IsDirty();
}


Local<v8::Object> v8::Object::Clone() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::Clone()", return Local<Object>());
  ENTER_V8(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::JSObject> result = isolate->factory()->CopyJSObject(self);
  has_pending_exception = result.is_null();
  EXCEPTION_BAILOUT_CHECK(isolate, Local<Object>());
  return Utils::ToLocal(result);
}


Local<v8::Context> v8::Object::CreationContext() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate,
             "v8::Object::CreationContext()", return Local<v8::Context>());
  ENTER_V8(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Context* context = self->GetCreationContext();
  return Utils::ToLocal(i::Handle<i::Context>(context));
}


int v8::Object::GetIdentityHash() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::GetIdentityHash()", return 0);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  return i::JSReceiver::GetOrCreateIdentityHash(self)->value();
}


bool v8::Object::SetHiddenValue(v8::Handle<v8::String> key,
                                v8::Handle<v8::Value> value) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::SetHiddenValue()", return false);
  if (value.IsEmpty()) return DeleteHiddenValue(key);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
  i::Handle<i::String> key_string =
      isolate->factory()->InternalizeString(key_obj);
  i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
  i::Handle<i::Object> result =
      i::JSObject::SetHiddenProperty(self, key_string, value_obj);
  return *result == *self;
}


v8::Local<v8::Value> v8::Object::GetHiddenValue(v8::Handle<v8::String> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::GetHiddenValue()",
             return Local<v8::Value>());
  ENTER_V8(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
  i::Handle<i::String> key_string =
      isolate->factory()->InternalizeString(key_obj);
  i::Handle<i::Object> result(self->GetHiddenProperty(key_string), isolate);
  if (result->IsTheHole()) return v8::Local<v8::Value>();
  return Utils::ToLocal(result);
}


bool v8::Object::DeleteHiddenValue(v8::Handle<v8::String> key) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::DeleteHiddenValue()", return false);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
  i::Handle<i::String> key_string =
      isolate->factory()->InternalizeString(key_obj);
  i::JSObject::DeleteHiddenProperty(self, key_string);
  return true;
}


namespace {

static i::ElementsKind GetElementsKindFromExternalArrayType(
    ExternalArrayType array_type) {
  switch (array_type) {
#define ARRAY_TYPE_TO_ELEMENTS_KIND(Type, type, TYPE, ctype, size)            \
    case kExternal##Type##Array:                                              \
      return i::EXTERNAL_##TYPE##_ELEMENTS;

    TYPED_ARRAYS(ARRAY_TYPE_TO_ELEMENTS_KIND)
#undef ARRAY_TYPE_TO_ELEMENTS_KIND
  }
  UNREACHABLE();
  return i::DICTIONARY_ELEMENTS;
}


void PrepareExternalArrayElements(i::Handle<i::JSObject> object,
                                  void* data,
                                  ExternalArrayType array_type,
                                  int length) {
  i::Isolate* isolate = object->GetIsolate();
  i::Handle<i::ExternalArray> array =
      isolate->factory()->NewExternalArray(length, array_type, data);

  i::Handle<i::Map> external_array_map =
      i::JSObject::GetElementsTransitionMap(
          object,
          GetElementsKindFromExternalArrayType(array_type));

  i::JSObject::SetMapAndElements(object, external_array_map, array);
}

}  // namespace


void v8::Object::SetIndexedPropertiesToPixelData(uint8_t* data, int length) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::SetElementsToPixelData()", return);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  if (!Utils::ApiCheck(length >= 0 &&
                       length <= i::ExternalUint8ClampedArray::kMaxLength,
                       "v8::Object::SetIndexedPropertiesToPixelData()",
                       "length exceeds max acceptable value")) {
    return;
  }
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  if (!Utils::ApiCheck(!self->IsJSArray(),
                       "v8::Object::SetIndexedPropertiesToPixelData()",
                       "JSArray is not supported")) {
    return;
  }
  PrepareExternalArrayElements(self, data, kExternalUint8ClampedArray, length);
}


bool v8::Object::HasIndexedPropertiesInPixelData() {
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  ON_BAILOUT(self->GetIsolate(), "v8::HasIndexedPropertiesInPixelData()",
             return false);
  return self->HasExternalUint8ClampedElements();
}


uint8_t* v8::Object::GetIndexedPropertiesPixelData() {
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  ON_BAILOUT(self->GetIsolate(), "v8::GetIndexedPropertiesPixelData()",
             return NULL);
  if (self->HasExternalUint8ClampedElements()) {
    return i::ExternalUint8ClampedArray::cast(self->elements())->
        external_uint8_clamped_pointer();
  } else {
    return NULL;
  }
}


int v8::Object::GetIndexedPropertiesPixelDataLength() {
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  ON_BAILOUT(self->GetIsolate(), "v8::GetIndexedPropertiesPixelDataLength()",
             return -1);
  if (self->HasExternalUint8ClampedElements()) {
    return i::ExternalUint8ClampedArray::cast(self->elements())->length();
  } else {
    return -1;
  }
}


void v8::Object::SetIndexedPropertiesToExternalArrayData(
    void* data,
    ExternalArrayType array_type,
    int length) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::SetIndexedPropertiesToExternalArrayData()", return);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  if (!Utils::ApiCheck(length >= 0 && length <= i::ExternalArray::kMaxLength,
                       "v8::Object::SetIndexedPropertiesToExternalArrayData()",
                       "length exceeds max acceptable value")) {
    return;
  }
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  if (!Utils::ApiCheck(!self->IsJSArray(),
                       "v8::Object::SetIndexedPropertiesToExternalArrayData()",
                       "JSArray is not supported")) {
    return;
  }
  PrepareExternalArrayElements(self, data, array_type, length);
}


bool v8::Object::HasIndexedPropertiesInExternalArrayData() {
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  ON_BAILOUT(self->GetIsolate(),
             "v8::HasIndexedPropertiesInExternalArrayData()",
             return false);
  return self->HasExternalArrayElements();
}


void* v8::Object::GetIndexedPropertiesExternalArrayData() {
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  ON_BAILOUT(self->GetIsolate(),
             "v8::GetIndexedPropertiesExternalArrayData()",
             return NULL);
  if (self->HasExternalArrayElements()) {
    return i::ExternalArray::cast(self->elements())->external_pointer();
  } else {
    return NULL;
  }
}


ExternalArrayType v8::Object::GetIndexedPropertiesExternalArrayDataType() {
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  ON_BAILOUT(self->GetIsolate(),
             "v8::GetIndexedPropertiesExternalArrayDataType()",
             return static_cast<ExternalArrayType>(-1));
  switch (self->elements()->map()->instance_type()) {
#define INSTANCE_TYPE_TO_ARRAY_TYPE(Type, type, TYPE, ctype, size)            \
    case i::EXTERNAL_##TYPE##_ARRAY_TYPE:                                     \
      return kExternal##Type##Array;
    TYPED_ARRAYS(INSTANCE_TYPE_TO_ARRAY_TYPE)
#undef INSTANCE_TYPE_TO_ARRAY_TYPE
    default:
      return static_cast<ExternalArrayType>(-1);
  }
}


int v8::Object::GetIndexedPropertiesExternalArrayDataLength() {
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  ON_BAILOUT(self->GetIsolate(),
             "v8::GetIndexedPropertiesExternalArrayDataLength()",
             return 0);
  if (self->HasExternalArrayElements()) {
    return i::ExternalArray::cast(self->elements())->length();
  } else {
    return -1;
  }
}


bool v8::Object::IsCallable() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::IsCallable()", return false);
  ENTER_V8(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
  return obj->IsCallable();
}


Local<v8::Value> Object::CallAsFunction(v8::Handle<v8::Value> recv,
                                        int argc,
                                        v8::Handle<v8::Value> argv[]) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::CallAsFunction()",
             return Local<v8::Value>());
  LOG_API(isolate, "Object::CallAsFunction");
  ENTER_V8(isolate);
  i::Logger::TimerEventScope timer_scope(
      isolate, i::Logger::TimerEventScope::v8_execute);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
  i::Handle<i::Object> recv_obj = Utils::OpenHandle(*recv);
  STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
  i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);
  i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>();
  if (obj->IsJSFunction()) {
    fun = i::Handle<i::JSFunction>::cast(obj);
  } else {
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> delegate;
    has_pending_exception = !i::Execution::TryGetFunctionDelegate(
        isolate, obj).ToHandle(&delegate);
    EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
    fun = i::Handle<i::JSFunction>::cast(delegate);
    recv_obj = obj;
  }
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> returned;
  has_pending_exception = !i::Execution::Call(
      isolate, fun, recv_obj, argc, args, true).ToHandle(&returned);
  EXCEPTION_BAILOUT_CHECK_DO_CALLBACK(isolate, Local<Value>());
  return Utils::ToLocal(scope.CloseAndEscape(returned));
}


Local<v8::Value> Object::CallAsConstructor(int argc,
                                           v8::Handle<v8::Value> argv[]) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Object::CallAsConstructor()",
             return Local<v8::Object>());
  LOG_API(isolate, "Object::CallAsConstructor");
  ENTER_V8(isolate);
  i::Logger::TimerEventScope timer_scope(
      isolate, i::Logger::TimerEventScope::v8_execute);
  i::HandleScope scope(isolate);
  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
  STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
  i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);
  if (obj->IsJSFunction()) {
    i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>::cast(obj);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> returned;
    has_pending_exception = !i::Execution::New(
        fun, argc, args).ToHandle(&returned);
    EXCEPTION_BAILOUT_CHECK_DO_CALLBACK(isolate, Local<v8::Object>());
    return Utils::ToLocal(scope.CloseAndEscape(
        i::Handle<i::JSObject>::cast(returned)));
  }
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> delegate;
  has_pending_exception = !i::Execution::TryGetConstructorDelegate(
      isolate, obj).ToHandle(&delegate);
  EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Object>());
  if (!delegate->IsUndefined()) {
    i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>::cast(delegate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> returned;
    has_pending_exception = !i::Execution::Call(
        isolate, fun, obj, argc, args).ToHandle(&returned);
    EXCEPTION_BAILOUT_CHECK_DO_CALLBACK(isolate, Local<v8::Object>());
    ASSERT(!delegate->IsUndefined());
    return Utils::ToLocal(scope.CloseAndEscape(returned));
  }
  return Local<v8::Object>();
}


Local<Function> Function::New(Isolate* v8_isolate,
                              FunctionCallback callback,
                              Local<Value> data,
                              int length) {
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  LOG_API(isolate, "Function::New");
  ENTER_V8(isolate);
  return FunctionTemplateNew(
      isolate, callback, data, Local<Signature>(), length, true)->
      GetFunction();
}


Local<v8::Object> Function::NewInstance() const {
  return NewInstance(0, NULL);
}


Local<v8::Object> Function::NewInstance(int argc,
                                        v8::Handle<v8::Value> argv[]) const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Function::NewInstance()",
             return Local<v8::Object>());
  LOG_API(isolate, "Function::NewInstance");
  ENTER_V8(isolate);
  i::Logger::TimerEventScope timer_scope(
      isolate, i::Logger::TimerEventScope::v8_execute);
  EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
  i::Handle<i::JSFunction> function = Utils::OpenHandle(this);
  STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
  i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> returned;
  has_pending_exception = !i::Execution::New(
      function, argc, args).ToHandle(&returned);
  EXCEPTION_BAILOUT_CHECK_DO_CALLBACK(isolate, Local<v8::Object>());
  return scope.Escape(Utils::ToLocal(i::Handle<i::JSObject>::cast(returned)));
}


Local<v8::Value> Function::Call(v8::Handle<v8::Value> recv, int argc,
                                v8::Handle<v8::Value> argv[]) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Function::Call()", return Local<v8::Value>());
  LOG_API(isolate, "Function::Call");
  ENTER_V8(isolate);
  i::Logger::TimerEventScope timer_scope(
      isolate, i::Logger::TimerEventScope::v8_execute);
  i::HandleScope scope(isolate);
  i::Handle<i::JSFunction> fun = Utils::OpenHandle(this);
  i::Handle<i::Object> recv_obj = Utils::OpenHandle(*recv);
  STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
  i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);
  EXCEPTION_PREAMBLE(isolate);
  i::Handle<i::Object> returned;
  has_pending_exception = !i::Execution::Call(
      isolate, fun, recv_obj, argc, args, true).ToHandle(&returned);
  EXCEPTION_BAILOUT_CHECK_DO_CALLBACK(isolate, Local<Object>());
  return Utils::ToLocal(scope.CloseAndEscape(returned));
}


void Function::SetName(v8::Handle<v8::String> name) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8(isolate);
  USE(isolate);
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  func->shared()->set_name(*Utils::OpenHandle(*name));
}


Handle<Value> Function::GetName() const {
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  return Utils::ToLocal(i::Handle<i::Object>(func->shared()->name(),
                                             func->GetIsolate()));
}


Handle<Value> Function::GetInferredName() const {
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  return Utils::ToLocal(i::Handle<i::Object>(func->shared()->inferred_name(),
                                             func->GetIsolate()));
}


Handle<Value> Function::GetDisplayName() const {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ON_BAILOUT(isolate, "v8::Function::GetDisplayName()",
             return ToApiHandle<Primitive>(
                 isolate->factory()->undefined_value()));
  ENTER_V8(isolate);
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  i::Handle<i::String> property_name =
      isolate->factory()->InternalizeOneByteString(
          STATIC_ASCII_VECTOR("displayName"));
  i::LookupResult lookup(isolate);
  func->LookupRealNamedProperty(property_name, &lookup);
  if (lookup.IsFound()) {
    i::Object* value = lookup.GetLazyValue();
    if (value && value->IsString()) {
      i::String* name = i::String::cast(value);
      if (name->length() > 0) return Utils::ToLocal(i::Handle<i::String>(name));
    }
  }
  return ToApiHandle<Primitive>(isolate->factory()->undefined_value());
}


ScriptOrigin Function::GetScriptOrigin() const {
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  if (func->shared()->script()->IsScript()) {
    i::Handle<i::Script> script(i::Script::cast(func->shared()->script()));
    i::Handle<i::Object> scriptName = i::Script::GetNameOrSourceURL(script);
    v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(func->GetIsolate());
    v8::ScriptOrigin origin(
        Utils::ToLocal(scriptName),
        v8::Integer::New(isolate, script->line_offset()->value()),
        v8::Integer::New(isolate, script->column_offset()->value()));
    return origin;
  }
  return v8::ScriptOrigin(Handle<Value>());
}


const int Function::kLineOffsetNotFound = -1;


int Function::GetScriptLineNumber() const {
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  if (func->shared()->script()->IsScript()) {
    i::Handle<i::Script> script(i::Script::cast(func->shared()->script()));
    return i::Script::GetLineNumber(script, func->shared()->start_position());
  }
  return kLineOffsetNotFound;
}


int Function::GetScriptColumnNumber() const {
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  if (func->shared()->script()->IsScript()) {
    i::Handle<i::Script> script(i::Script::cast(func->shared()->script()));
    return i::Script::GetColumnNumber(script, func->shared()->start_position());
  }
  return kLineOffsetNotFound;
}


bool Function::IsBuiltin() const {
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  return func->IsBuiltin();
}


int Function::ScriptId() const {
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  if (!func->shared()->script()->IsScript()) {
    return v8::UnboundScript::kNoScriptId;
  }
  i::Handle<i::Script> script(i::Script::cast(func->shared()->script()));
  return script->id()->value();
}


Local<v8::Value> Function::GetBoundFunction() const {
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  if (!func->shared()->bound()) {
    return v8::Undefined(reinterpret_cast<v8::Isolate*>(func->GetIsolate()));
  }
  i::Handle<i::FixedArray> bound_args = i::Handle<i::FixedArray>(
      i::FixedArray::cast(func->function_bindings()));
  i::Handle<i::Object> original(
      bound_args->get(i::JSFunction::kBoundFunctionIndex),
      func->GetIsolate());
  return Utils::ToLocal(i::Handle<i::JSFunction>::cast(original));
}


int String::Length() const {
  i::Handle<i::String> str = Utils::OpenHandle(this);
  return str->length();
}


bool String::IsOneByte() const {
  i::Handle<i::String> str = Utils::OpenHandle(this);
  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> {
  static const uint64_t value = V8_2PART_UINT64_C(0xFF00FF00, FF00FF00);
};
static const uintptr_t kOneByteMask = OneByteMask<sizeof(uintptr_t)>::value;
static const uintptr_t kAlignmentMask = sizeof(uintptr_t) - 1;
static inline bool Unaligned(const uint16_t* chars) {
  return reinterpret_cast<const uintptr_t>(chars) & kAlignmentMask;
}


static inline const uint16_t* Align(const uint16_t* chars) {
  return reinterpret_cast<uint16_t*>(
      reinterpret_cast<uintptr_t>(chars) & ~kAlignmentMask);
}

class ContainsOnlyOneByteHelper {
 public:
  ContainsOnlyOneByteHelper() : is_one_byte_(true) {}
  bool Check(i::String* string) {
    i::ConsString* cons_string = i::String::VisitFlat(this, string, 0);
    if (cons_string == NULL) return is_one_byte_;
    return CheckCons(cons_string);
  }
  void VisitOneByteString(const uint8_t* chars, int length) {
    // Nothing to do.
  }
  void VisitTwoByteString(const uint16_t* chars, int length) {
    // Accumulated bits.
    uintptr_t acc = 0;
    // Align to uintptr_t.
    const uint16_t* end = chars + length;
    while (Unaligned(chars) && chars != end) {
      acc |= *chars++;
    }
    // Read word aligned in blocks,
    // checking the return value at the end of each block.
    const uint16_t* aligned_end = Align(end);
    const int increment = sizeof(uintptr_t)/sizeof(uint16_t);
    const int inner_loops = 16;
    while (chars + inner_loops*increment < aligned_end) {
      for (int i = 0; i < inner_loops; i++) {
        acc |= *reinterpret_cast<const uintptr_t*>(chars);
        chars += increment;
      }
      // Check for early return.
      if ((acc & kOneByteMask) != 0) {
        is_one_byte_ = false;
        return;
      }
    }
    // Read the rest.
    while (chars != end) {
      acc |= *chars++;
    }
    // Check result.
    if ((acc & kOneByteMask) != 0) is_one_byte_ = false;
  }

 private:
  bool CheckCons(i::ConsString* cons_string) {
    while (true) {
      // Check left side if flat.
      i::String* left = cons_string->first();
      i::ConsString* left_as_cons =
          i::String::VisitFlat(this, left, 0);
      if (!is_one_byte_) return false;
      // Check right side if flat.
      i::String* right = cons_string->second();
      i::ConsString* right_as_cons =
          i::String::VisitFlat(this, right, 0);
      if (!is_one_byte_) return false;
      // Standard recurse/iterate trick.
      if (left_as_cons != NULL && right_as_cons != NULL) {
        if (left->length() < right->length()) {
          CheckCons(left_as_cons);
          cons_string = right_as_cons;
        } else {
          CheckCons(right_as_cons);
          cons_string = left_as_cons;
        }
        // Check fast return.
        if (!is_one_byte_) return false;
        continue;
      }
      // Descend left in place.
      if (left_as_cons != NULL) {
        cons_string = left_as_cons;
        continue;
      }
      // Descend right in place.
      if (right_as_cons != NULL) {
        cons_string = right_as_cons;
        continue;
      }
      // Terminate.
      break;
    }
    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 (str->HasOnlyOneByteChars()) return true;
  ContainsOnlyOneByteHelper helper;
  return helper.Check(*str);
}


class Utf8LengthHelper : public i::AllStatic {
 public:
  enum State {
    kEndsWithLeadingSurrogate = 1 << 0,
    kStartsWithTrailingSurrogate = 1 << 1,
    kLeftmostEdgeIsCalculated = 1 << 2,
    kRightmostEdgeIsCalculated = 1 << 3,
    kLeftmostEdgeIsSurrogate = 1 << 4,
    kRightmostEdgeIsSurrogate = 1 << 5
  };

  static const uint8_t kInitialState = 0;

  static inline bool EndsWithSurrogate(uint8_t state) {
    return state & kEndsWithLeadingSurrogate;
  }

  static inline bool StartsWithSurrogate(uint8_t state) {
    return state & kStartsWithTrailingSurrogate;
  }

  class Visitor {
   public:
    inline explicit Visitor()
        : utf8_length_(0),
          state_(kInitialState) {}

    void VisitOneByteString(const uint8_t* chars, int length) {
      int utf8_length = 0;
      // Add in length 1 for each non-ASCII character.
      for (int i = 0; i < length; i++) {
        utf8_length += *chars++ >> 7;
      }
      // Add in length 1 for each character.
      utf8_length_ = utf8_length + length;
      state_ = kInitialState;
    }

    void VisitTwoByteString(const uint16_t* chars, int length) {
      int utf8_length = 0;
      int last_character = unibrow::Utf16::kNoPreviousCharacter;
      for (int i = 0; i < length; i++) {
        uint16_t c = chars[i];
        utf8_length += unibrow::Utf8::Length(c, last_character);
        last_character = c;
      }
      utf8_length_ = utf8_length;
      uint8_t state = 0;
      if (unibrow::Utf16::IsTrailSurrogate(chars[0])) {
        state |= kStartsWithTrailingSurrogate;
      }
      if (unibrow::Utf16::IsLeadSurrogate(chars[length-1])) {
        state |= kEndsWithLeadingSurrogate;
      }
      state_ = state;
    }

    static i::ConsString* VisitFlat(i::String* string,
                                    int* length,
                                    uint8_t* state) {
      Visitor visitor;
      i::ConsString* cons_string = i::String::VisitFlat(&visitor, string);
      *length = visitor.utf8_length_;
      *state = visitor.state_;
      return cons_string;
    }

   private:
    int utf8_length_;
    uint8_t state_;
    DISALLOW_COPY_AND_ASSIGN(Visitor);
  };

  static inline void MergeLeafLeft(int* length,
                                   uint8_t* state,
                                   uint8_t leaf_state) {
    bool edge_surrogate = StartsWithSurrogate(leaf_state);
    if (!(*state & kLeftmostEdgeIsCalculated)) {
      ASSERT(!(*state & kLeftmostEdgeIsSurrogate));
      *state |= kLeftmostEdgeIsCalculated
          | (edge_surrogate ? kLeftmostEdgeIsSurrogate : 0);
    } else if (EndsWithSurrogate(*state) && edge_surrogate) {
      *length -= unibrow::Utf8::kBytesSavedByCombiningSurrogates;
    }
    if (EndsWithSurrogate(leaf_state)) {
      *state |= kEndsWithLeadingSurrogate;
    } else {
      *state &= ~kEndsWithLeadingSurrogate;
    }
  }

  static inline void MergeLeafRight(int* length,
                                    uint8_t* state,
                                    uint8_t leaf_state) {
    bool edge_surrogate = EndsWithSurrogate(leaf_state);
    if (!(*state & kRightmostEdgeIsCalculated)) {
      ASSERT(!(*state & kRightmostEdgeIsSurrogate));
      *state |= (kRightmostEdgeIsCalculated
                 | (edge_surrogate ? kRightmostEdgeIsSurrogate : 0));
    } else if (edge_surrogate && StartsWithSurrogate(*state)) {
      *length -= unibrow::Utf8::kBytesSavedByCombiningSurrogates;
    }
    if (StartsWithSurrogate(leaf_state)) {
      *state |= kStartsWithTrailingSurrogate;
    } else {
      *state &= ~kStartsWithTrailingSurrogate;
    }
  }

  static inline void MergeTerminal(int* length,
                                   uint8_t state,
                                   uint8_t* state_out) {
    ASSERT((state & kLeftmostEdgeIsCalculated) &&
           (state & kRightmostEdgeIsCalculated));
    if (EndsWithSurrogate(state) && StartsWithSurrogate(state)) {
      *length -= unibrow::Utf8::kBytesSavedByCombiningSurrogates;
    }
    *state_out = kInitialState |
        (state & kLeftmostEdgeIsSurrogate ? kStartsWithTrailingSurrogate : 0) |
        (state & kRightmostEdgeIsSurrogate ? kEndsWithLeadingSurrogate : 0);
  }

  static int Calculate(i::ConsString* current, uint8_t* state_out) {
    using namespace internal;
    int total_length = 0;
    uint8_t state = kInitialState;
    while (true) {
      i::String* left = current->first();
      i::String* right = current->second();
      uint8_t right_leaf_state;
      uint8_t left_leaf_state;
      int leaf_length;
      ConsString* left_as_cons =
          Visitor::VisitFlat(left, &leaf_length, &left_leaf_state);
      if (left_as_cons == NULL) {
        total_length += leaf_length;
        MergeLeafLeft(&total_length, &state, left_leaf_state);
      }
      ConsString* right_as_cons =
          Visitor::VisitFlat(right, &leaf_length, &right_leaf_state);
      if (right_as_cons == NULL) {
        total_length += leaf_length;
        MergeLeafRight(&total_length, &state, right_leaf_state);
        if (left_as_cons != NULL) {
          // 1 Leaf node. Descend in place.
          current = left_as_cons;
          continue;
        } else {
          // Terminal node.
          MergeTerminal(&total_length, state, state_out);
          return total_length;
        }
      } else if (left_as_cons == NULL) {
        // 1 Leaf node. Descend in place.
        current = right_as_cons;
        continue;
      }
      // Both strings are ConsStrings.
      // Recurse on smallest.
      if (left->length() < right->length()) {
        total_length += Calculate(left_as_cons, &left_leaf_state);
        MergeLeafLeft(&total_length, &state, left_leaf_state);
        current = right_as_cons;
      } else {
        total_length += Calculate(right_as_cons, &right_leaf_state);
        MergeLeafRight(&total_length, &state, right_leaf_state);
        current = left_as_cons;
      }
    }
    UNREACHABLE();
    return 0;
  }

  static inline int Calculate(i::ConsString* current) {
    uint8_t state = kInitialState;
    return Calculate(current, &state);
  }

 private:
  DISALLOW_IMPLICIT_CONSTRUCTORS(Utf8LengthHelper);
};


static int Utf8Length(i::String* str, i::Isolate* isolate) {
  int length = str->length();
  if (length == 0) return 0;
  uint8_t state;
  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();
  return v8::Utf8Length(*str, isolate);
}


class Utf8WriterVisitor {
 public:
  Utf8WriterVisitor(
      char* buffer,
      int capacity,
      bool skip_capacity_check,
      bool replace_invalid_utf8)
    : early_termination_(false),
      last_character_(unibrow::Utf16::kNoPreviousCharacter),
      buffer_(buffer),
      start_(buffer),
      capacity_(capacity),
      skip_capacity_check_(capacity == -1 || skip_capacity_check),
      replace_invalid_utf8_(replace_invalid_utf8),
      utf16_chars_read_(0) {
  }

  static int WriteEndCharacter(uint16_t character,
                               int last_character,
                               int remaining,
                               char* const buffer,
                               bool replace_invalid_utf8) {
    using namespace unibrow;
    ASSERT(remaining > 0);
    // We can't use a local buffer here because Encode needs to modify
    // previous characters in the stream.  We know, however, that
    // exactly one character will be advanced.
    if (Utf16::IsSurrogatePair(last_character, character)) {
      int written = Utf8::Encode(buffer,
                                 character,
                                 last_character,
                                 replace_invalid_utf8);
      ASSERT(written == 1);
      return written;
    }
    // Use a scratch buffer to check the required characters.
    char temp_buffer[Utf8::kMaxEncodedSize];
    // Can't encode using last_character as gcc has array bounds issues.
    int written = Utf8::Encode(temp_buffer,
                               character,
                               Utf16::kNoPreviousCharacter,
                               replace_invalid_utf8);
    // Won't fit.
    if (written > remaining) return 0;
    // Copy over the character from temp_buffer.
    for (int j = 0; j < written; j++) {
      buffer[j] = temp_buffer[j];
    }
    return written;
  }

  // Visit writes out a group of code units (chars) of a v8::String to the
  // internal buffer_. This is done in two phases. The first phase calculates a
  // pesimistic estimate (writable_length) on how many code units can be safely
  // written without exceeding the buffer capacity and without writing the last
  // code unit (it could be a lead surrogate). The estimated number of code
  // units is then written out in one go, and the reported byte usage is used
  // to correct the estimate. This is repeated until the estimate becomes <= 0
  // or all code units have been written out. The second phase writes out code
  // units until the buffer capacity is reached, would be exceeded by the next
  // unit, or all units have been written out.
  template<typename Char>
  void Visit(const Char* chars, const int length) {
    using namespace unibrow;
    ASSERT(!early_termination_);
    if (length == 0) return;
    // Copy state to stack.
    char* buffer = buffer_;
    int last_character =
        sizeof(Char) == 1 ? Utf16::kNoPreviousCharacter : last_character_;
    int i = 0;
    // Do a fast loop where there is no exit capacity check.
    while (true) {
      int fast_length;
      if (skip_capacity_check_) {
        fast_length = length;
      } else {
        int remaining_capacity = capacity_ - static_cast<int>(buffer - start_);
        // Need enough space to write everything but one character.
        STATIC_ASSERT(Utf16::kMaxExtraUtf8BytesForOneUtf16CodeUnit == 3);
        int max_size_per_char =  sizeof(Char) == 1 ? 2 : 3;
        int writable_length =
            (remaining_capacity - max_size_per_char)/max_size_per_char;
        // Need to drop into slow loop.
        if (writable_length <= 0) break;
        fast_length = i + writable_length;
        if (fast_length > length) fast_length = length;
      }
      // Write the characters to the stream.
      if (sizeof(Char) == 1) {
        for (; i < fast_length; i++) {
          buffer +=
              Utf8::EncodeOneByte(buffer, static_cast<uint8_t>(*chars++));
          ASSERT(capacity_ == -1 || (buffer - start_) <= capacity_);
        }
      } else {
        for (; i < fast_length; i++) {
          uint16_t character = *chars++;
          buffer += Utf8::Encode(buffer,
                                 character,
                                 last_character,
                                 replace_invalid_utf8_);
          last_character = character;
          ASSERT(capacity_ == -1 || (buffer - start_) <= capacity_);
        }
      }
      // Array is fully written. Exit.
      if (fast_length == length) {
        // Write state back out to object.
        last_character_ = last_character;
        buffer_ = buffer;
        utf16_chars_read_ += length;
        return;
      }
    }
    ASSERT(!skip_capacity_check_);
    // Slow loop. Must check capacity on each iteration.
    int remaining_capacity = capacity_ - static_cast<int>(buffer - start_);
    ASSERT(remaining_capacity >= 0);
    for (; i < length && remaining_capacity > 0; i++) {
      uint16_t character = *chars++;
      // remaining_capacity is <= 3 bytes at this point, so we do not write out
      // an umatched lead surrogate.
      if (replace_invalid_utf8_ && Utf16::IsLeadSurrogate(character)) {
        early_termination_ = true;
        break;
      }
      int written = WriteEndCharacter(character,
                                      last_character,
                                      remaining_capacity,
                                      buffer,