text: // Copyright 2012 the V8 project authors. All rights reserved.
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  //       copyright notice, this list of conditions and the following
  //       disclaimer in the documentation and/or other materials provided
  //       with the distribution.
  //     * Neither the name of Google Inc. nor the names of its
  //       contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #include "api.h"
  
  #include <string.h>  // For memcpy, strlen.
  #include <cmath>  // For isnan.
  #include "../include/v8-debug.h"
  #include "../include/v8-profiler.h"
  #include "../include/v8-testing.h"
  #include "assert-scope.h"
  #include "bootstrapper.h"
  #include "code-stubs.h"
  #include "compiler.h"
  #include "conversions-inl.h"
  #include "counters.h"
  #include "cpu-profiler.h"
  #include "debug.h"
  #include "deoptimizer.h"
  #include "execution.h"
  #include "global-handles.h"
  #include "heap-profiler.h"
  #include "heap-snapshot-generator-inl.h"
  #include "icu_util.h"
  #include "json-parser.h"
  #include "messages.h"
  #ifdef COMPRESS_STARTUP_DATA_BZ2
  #include "natives.h"
  #endif
  #include "parser.h"
  #include "platform.h"
  #include "platform/time.h"
  #include "profile-generator-inl.h"
  #include "property-details.h"
  #include "property.h"
  #include "runtime.h"
  #include "runtime-profiler.h"
  #include "scanner-character-streams.h"
  #include "snapshot.h"
  #include "unicode-inl.h"
  #include "utils/random-number-generator.h"
  #include "v8threads.h"
  #include "version.h"
  #include "vm-state-inl.h"
  
  // Disable error about "this" never being NULL in well
  // defined C++ code (Clang 3.5)
  // See SERVER-15306
  #pragma clang diagnostic push
  #pragma clang diagnostic ignored "-Wtautological-undefined-compare"
  
  #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, i::V8::FireCallCompletedCallback(isolate);)
  
  
  #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");
  }
  
  
  // Some initializing API functions are called early and may be
  // called on a thread different from static initializer thread.
  // If Isolate API is used, Isolate::Enter() will initialize TLS so
  // Isolate::Current() works. If it's a legacy case, then the thread
  // may not have TLS initialized yet. However, in initializing APIs it
  // may be too early to call EnsureInitialized() - some pre-init
  // parameters still have to be configured.
  static inline i::Isolate* EnterIsolateIfNeeded() {
    i::Isolate* isolate = i::Isolate::UncheckedCurrent();
    if (isolate != NULL)
      return isolate;
  
    i::Isolate::EnterDefaultIsolate();
    isolate = i::Isolate::Current();
    return isolate;
  }
  
  
  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 = EnterIsolateIfNeeded();
    isolate->set_exception_behavior(that);
  }
  
  
  void V8::SetAllowCodeGenerationFromStringsCallback(
      AllowCodeGenerationFromStringsCallback callback) {
    i::Isolate* isolate = EnterIsolateIfNeeded();
    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_young_space_size_(0),
        max_old_space_size_(0),
        max_executable_size_(0),
        stack_limit_(NULL),
        max_available_threads_(0) { }
  
  void ResourceConstraints::ConfigureDefaults(uint64_t physical_memory,
                                              uint32_t number_of_processors) {
    const int lump_of_memory = (i::kPointerSize / 4) * i::MB;
  #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
  
    // The young_space_size should be a power of 2 and old_generation_size should
    // be a multiple of Page::kPageSize.
    if (physical_memory <= low_limit) {
      set_max_young_space_size(2 * lump_of_memory);
      set_max_old_space_size(128 * lump_of_memory);
      set_max_executable_size(96 * lump_of_memory);
    } else if (physical_memory <= medium_limit) {
      set_max_young_space_size(8 * lump_of_memory);
      set_max_old_space_size(256 * lump_of_memory);
      set_max_executable_size(192 * lump_of_memory);
    } else if (physical_memory <= high_limit) {
      set_max_young_space_size(16 * lump_of_memory);
      set_max_old_space_size(512 * lump_of_memory);
      set_max_executable_size(256 * lump_of_memory);
    } else {
      set_max_young_space_size(16 * lump_of_memory);
      set_max_old_space_size(700 * lump_of_memory);
      set_max_executable_size(256 * lump_of_memory);
    }
  
    set_max_available_threads(i::Max(i::Min(number_of_processors, 4u), 1u));
  }
  
  
  bool SetResourceConstraints(Isolate* v8_isolate,
                              ResourceConstraints* constraints) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    int young_space_size = constraints->max_young_space_size();
    int old_gen_size = constraints->max_old_space_size();
    int max_executable_size = constraints->max_executable_size();
    if (young_space_size != 0 || old_gen_size != 0 || max_executable_size != 0) {
      // After initialization it's too late to change Heap constraints.
      ASSERT(!isolate->IsInitialized());
      bool result = isolate->heap()->ConfigureHeap(young_space_size / 2,
                                                   old_gen_size,
                                                   max_executable_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)->Verify();
  #endif  // DEBUG
    return result.location();
  }
  
  
  i::Object** V8::CopyPersistent(i::Object** obj) {
    i::Handle<i::Object> result = i::GlobalHandles::CopyGlobal(obj);
  #ifdef DEBUG
    (*obj)->Verify();
  #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 = env->GetIsolate()->factory()->CopySizeFixedArray(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);
    if (settings & PROHIBITS_OVERWRITING) obj->set_prohibits_overwriting(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::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    if (!Utils::ApiCheck(this != NULL,
                         "v8::FunctionTemplate::InstanceTemplate()",
                         "Reading from empty handle")) {
      return Local<ObjectTemplate>();
    }
    ENTER_V8(isolate);
    i::Handle<i::FunctionTemplateInfo> handle = Utils::OpenHandle(this);
    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 D a t a ---
  
  
  ScriptData* ScriptData::PreCompile(v8::Handle<String> source) {
    i::Handle<i::String> str = Utils::OpenHandle(*source);
    i::Isolate* isolate = str->GetIsolate();
    if (str->IsExternalTwoByteString()) {
      i::ExternalTwoByteStringUtf16CharacterStream stream(
          i::Handle<i::ExternalTwoByteString>::cast(str), 0, str->length());
      return i::PreParserApi::PreParse(isolate, &stream);
    } else {
      i::GenericStringUtf16CharacterStream stream(str, 0, str->length());
      return i::PreParserApi::PreParse(isolate, &stream);
    }
  }
  
  
  ScriptData* ScriptData::New(const char* data, int length) {
    // Return an empty ScriptData if the length is obviously invalid.
    if (length % sizeof(unsigned) != 0) {
      return new i::ScriptDataImpl();
    }
  
    // Copy the data to ensure it is properly aligned.
    int deserialized_data_length = length / sizeof(unsigned);
    // If aligned, don't create a copy of the data.
    if (reinterpret_cast<intptr_t>(data) % sizeof(unsigned) == 0) {
      return new i::ScriptDataImpl(data, length);
    }
    // Copy the data to align it.
    unsigned* deserialized_data = i::NewArray<unsigned>(deserialized_data_length);
    i::CopyBytes(reinterpret_cast<char*>(deserialized_data),
                 data, static_cast<size_t>(length));
  
    return new i::ScriptDataImpl(
        i::Vector<unsigned>(deserialized_data, deserialized_data_length));
  }
  
  
  // --- 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::HeapObject> obj =
        i::Handle<i::HeapObject>::cast(Utils::OpenHandle(this));
    i::Isolate* isolate = obj->GetIsolate();
    ON_BAILOUT(isolate, "v8::UnboundScript::GetLineNumber()", return -1);
    LOG_API(isolate, "UnboundScript::GetLineNumber");
    if (obj->IsScript()) {
      i::Handle<i::Script> script(i::Script::cast(*obj));
      return i::GetScriptLineNumber(script, code_pos);
    } else {
      return -1;
    }
  }
  
  
  Handle<Value> UnboundScript::GetScriptName() {
    i::Handle<i::HeapObject> obj =
        i::Handle<i::HeapObject>::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->IsScript()) {
      i::Object* name = i::Script::cast(*obj)->name();
      return Utils::ToLocal(i::Handle<i::Object>(name, isolate));
    } else {
      return Handle<String>();
    }
  }
  
  
  Local<Value> Script::Run() {
    // If execution is terminating, Compile(..)->Run() requires this
    // check.
    if (this == NULL) return Local<Value>();
    i::Handle<i::HeapObject> obj =
        i::Handle<i::HeapObject>::cast(Utils::OpenHandle(this));
    i::Isolate* isolate = 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::Object* raw_result = NULL;
    {
      i::HandleScope scope(isolate);
      i::Handle<i::JSFunction> fun =
          i::Handle<i::JSFunction>(i::JSFunction::cast(*obj), isolate);
      EXCEPTION_PREAMBLE(isolate);
      i::Handle<i::Object> receiver(
          isolate->context()->global_proxy(), isolate);
      i::Handle<i::Object> result = i::Execution::Call(
          isolate, fun, receiver, 0, NULL, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK_DO_CALLBACK(isolate, Local<Value>());
      raw_result = *result;
    }
    i::Handle<i::Object> result(raw_result, isolate);
    return Utils::ToLocal(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::ScriptDataImpl* script_data_impl = NULL;
    i::CachedDataMode cached_data_mode = i::NO_CACHED_DATA;
    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. In release mode, try to do the right thing: Just regenerate the
        // data.
        delete source->cached_data;
        source->cached_data = NULL;
      }
    } else if (source->cached_data) {
      // FIXME(marja): Make compiler use CachedData directly. Aligning needs to be
      // taken care of.
      script_data_impl = static_cast<i::ScriptDataImpl*>(ScriptData::New(
          reinterpret_cast<const char*>(source->cached_data->data),
          source->cached_data->length));
      // We assert that the pre-data is sane, even though we can actually
      // handle it if it turns out not to be in release mode.
      ASSERT(script_data_impl->SanityCheck());
      if (script_data_impl->SanityCheck()) {
        cached_data_mode = i::CONSUME_CACHED_DATA;
      } else {
        // If the pre-data isn't sane we simply ignore it.
        delete script_data_impl;
        script_data_impl = NULL;
        delete source->cached_data;
        source->cached_data = NULL;
      }
    }
  
    i::Handle<i::String> str = Utils::OpenHandle(*(source->source_string));
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ON_BAILOUT(isolate, "v8::ScriptCompiler::CompileUnbound()",
               return Local<UnboundScript>());
    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();
      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,
                                ScriptData* script_data) {
    i::Handle<i::String> str = Utils::OpenHandle(*source);
    ScriptCompiler::CachedData* cached_data = NULL;
    if (script_data) {
      cached_data = new ScriptCompiler::CachedData(
          reinterpret_cast<const uint8_t*>(script_data->Data()),
          script_data->Length());
    }
    if (origin) {
      ScriptCompiler::Source script_source(source, *origin, cached_data);
      return ScriptCompiler::Compile(
          reinterpret_cast<v8::Isolate*>(str->GetIsolate()),
          &script_source);
    }
    ScriptCompiler::Source script_source(source, cached_data);
    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_address()),
        is_verbose_(false),
        can_continue_(true),
        capture_message_(true),
        rethrow_(false),
        has_terminated_(false) {
    Reset();
    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);
      reinterpret_cast<Isolate*>(isolate_)->ThrowException(exc);
      ASSERT(!isolate_->thread_local_top()->rethrowing_message_);
    } else {
      isolate_->UnregisterTryCatchHandler(this);
    }
  }
  
  
  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 = i::GetProperty(isolate_, obj, name);
      if (value.is_null()) 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));
  }
  
  
  static i::Handle<i::Object> CallV8HeapFunction(const char* name,
                                                 i::Handle<i::Object> recv,
                                                 int argc,
                                                 i::Handle<i::Object> argv[],
                                                 bool* has_pending_exception) {
    i::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::String> fmt_str =
        isolate->factory()->InternalizeUtf8String(name);
    i::Object* object_fun =
        isolate->js_builtins_object()->GetPropertyNoExceptionThrown(*fmt_str);
    i::Handle<i::JSFunction> fun =
        i::Handle<i::JSFunction>(i::JSFunction::cast(object_fun));
    i::Handle<i::Object> value = i::Execution::Call(
        isolate, fun, recv, argc, argv, has_pending_exception);
    return value;
  }
  
  
  static i::Handle<i::Object> CallV8HeapFunction(const char* name,
                                                 i::Handle<i::Object> data,
                                                 bool* has_pending_exception) {
    i::Handle<i::Object> argv[] = { data };
    return CallV8HeapFunction(name,
                              i::Isolate::Current()->js_builtins_object(),
                              ARRAY_SIZE(argv),
                              argv,
                              has_pending_exception);
  }
  
  
  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 = CallV8HeapFunction("GetLineNumber",
                                                     Utils::OpenHandle(this),
                                                     &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(isolate, 0);
    return static_cast<int>(result->Number());
  }
  
  
  int Message::GetStartPosition() const {
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    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 = CallV8HeapFunction(
        "GetPositionInLine",
        data_obj,
        &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(isolate, 0);
    return static_cast<int>(start_col_obj->Number());
  }
  
  
  int Message::GetEndColumn() const {
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8(isolate);
    i::HandleScope scope(isolate);
    i::Handle<i::JSObject> data_obj = Utils::OpenHandle(this);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> start_col_obj = CallV8HeapFunction(
        "GetPositionInLine",
        data_obj,
        &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(isolate, 0);
    i::Handle<i::JSMessageObject> message =
        i::Handle<i::JSMessageObject>::cast(data_obj);
    int start = message->start_position();
    int end = message->end_position();
    return static_cast<int>(start_col_obj->Number()) + (end - start);
  }
  
  
  bool Message::IsSharedCrossOrigin() const {
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    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 = CallV8HeapFunction("GetSourceLine",
                                                     Utils::OpenHandle(this),
                                                     &has_pending_exception);
    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::GetElementNoExceptionThrown(isolate, self, index);
    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);
    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 = GetProperty(self, "lineNumber");
    if (!line->IsSmi()) {
      return Message::kNoLineNumberInfo;
    }
    return i::Smi::cast(*line)->value();
  }
  
  
  int StackFrame::GetColumn() const {
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8(isolate);
    i::HandleScope scope(isolate);
    i::Handle<i::JSObject> self = Utils::OpenHandle(this);
    i::Handle<i::Object> column = GetProperty(self, "column");
    if (!column->IsSmi()) {
      return Message::kNoColumnInfo;
    }
    return i::Smi::cast(*column)->value();
  }
  
  
  int StackFrame::GetScriptId() const {
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8(isolate);
    i::HandleScope scope(isolate);
    i::Handle<i::JSObject> self = Utils::OpenHandle(this);
    i::Handle<i::Object> scriptId = GetProperty(self, "scriptId");
    if (!scriptId->IsSmi()) {
      return Message::kNoScriptIdInfo;
    }
    return i::Smi::cast(*scriptId)->value();
  }
  
  
  Local<String> StackFrame::GetScriptName() const {
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8(isolate);
    EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
    i::Handle<i::JSObject> self = Utils::OpenHandle(this);
    i::Handle<i::Object> name = GetProperty(self, "scriptName");
    if (!name->IsString()) {
      return Local<String>();
    }
    return scope.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 = GetProperty(self, "scriptNameOrSourceURL");
    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 = GetProperty(self, "functionName");
    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 = GetProperty(self, "isEval");
    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 = GetProperty(self, "isConstructor");
    return is_constructor->IsTrue();
  }
  
  
  // --- J S O N ---
  
  Local<Value> JSON::Parse(Local<String> json_string) {
    i::Isolate* isolate = i::Isolate::Current();
    EnsureInitializedForIsolate(isolate, "v8::JSON::Parse");
    ENTER_V8(isolate);
    i::HandleScope scope(isolate);
    i::Handle<i::String> source = i::Handle<i::String>(
        FlattenGetString(Utils::OpenHandle(*json_string)));
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> result;
    if (source->IsSeqOneByteString()) {
      result = i::JsonParser<true>::Parse(source);
    } else {
      result = i::JsonParser<false>::Parse(source);
    }
    has_pending_exception = result.is_null();
    EXCEPTION_BAILOUT_CHECK(isolate, Local<Object>());
    return Utils::ToLocal(
        i::Handle<i::Object>::cast(scope.CloseAndEscape(result)));
  }
  
  
  // --- D a t a ---
  
  bool Value::FullIsUndefined() const {
    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::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    return obj->HasSpecificClassOf(isolate->heap()->Date_string());
  }
  
  
  bool Value::IsStringObject() const {
    i::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    return obj->HasSpecificClassOf(isolate->heap()->String_string());
  }
  
  
  bool Value::IsSymbolObject() const {
    // TODO(svenpanne): these and other test functions should be written such
    // that they do not use Isolate::Current().
    i::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    return obj->HasSpecificClassOf(isolate->heap()->Symbol_string());
  }
  
  
  bool Value::IsNumberObject() const {
    i::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    return obj->HasSpecificClassOf(isolate->heap()->Number_string());
  }
  
  
  static i::Object* LookupBuiltin(i::Isolate* isolate,
                                  const char* builtin_name) {
    i::Handle<i::String> string =
        isolate->factory()->InternalizeUtf8String(builtin_name);
    i::Handle<i::JSBuiltinsObject> builtins = isolate->js_builtins_object();
    return builtins->GetPropertyNoExceptionThrown(*string);
  }
  
  
  static bool CheckConstructor(i::Isolate* isolate,
                               i::Handle<i::JSObject> obj,
                               const char* class_name) {
    i::Object* constr = obj->map()->constructor();
    if (!constr->IsJSFunction()) return false;
    i::JSFunction* func = i::JSFunction::cast(constr);
    return func->shared()->native() &&
        constr == LookupBuiltin(isolate, class_name);
  }
  
  
  bool Value::IsNativeError() const {
    i::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsJSObject()) {
      i::Handle<i::JSObject> js_obj(i::JSObject::cast(*obj));
      return CheckConstructor(isolate, js_obj, "$Error") ||
          CheckConstructor(isolate, js_obj, "$EvalError") ||
          CheckConstructor(isolate, js_obj, "$RangeError") ||
          CheckConstructor(isolate, js_obj, "$ReferenceError") ||
          CheckConstructor(isolate, js_obj, "$SyntaxError") ||
          CheckConstructor(isolate, js_obj, "$TypeError") ||
          CheckConstructor(isolate, js_obj, "$URIError");
    } else {
      return false;
    }
  }
  
  
  bool Value::IsBooleanObject() const {
    i::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    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);
      str = i::Execution::ToString(isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, Local<String>());
    }
    return ToApiHandle<String>(str);
  }
  
  
  Local<String> Value::ToDetailString() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::Object> str;
    if (obj->IsString()) {
      str = obj;
    } else {
      i::Isolate* isolate = i::Isolate::Current();
      LOG_API(isolate, "ToDetailString");
      ENTER_V8(isolate);
      EXCEPTION_PREAMBLE(isolate);
      str = i::Execution::ToDetailString(isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, Local<String>());
    }
    return ToApiHandle<String>(str);
  }
  
  
  Local<v8::Object> Value::ToObject() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::Object> val;
    if (obj->IsJSObject()) {
      val = obj;
    } else {
      i::Isolate* isolate = i::Isolate::Current();
      LOG_API(isolate, "ToObject");
      ENTER_V8(isolate);
      EXCEPTION_PREAMBLE(isolate);
      val = i::Execution::ToObject(isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Object>());
    }
    return ToApiHandle<Object>(val);
  }
  
  
  Local<Boolean> Value::ToBoolean() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsBoolean()) {
      return ToApiHandle<Boolean>(obj);
    } else {
      i::Isolate* isolate = i::Isolate::Current();
      LOG_API(isolate, "ToBoolean");
      ENTER_V8(isolate);
      i::Handle<i::Object> val =
          isolate->factory()->ToBoolean(obj->BooleanValue());
      return ToApiHandle<Boolean>(val);
    }
  }
  
  
  Local<Number> Value::ToNumber() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::Object> num;
    if (obj->IsNumber()) {
      num = obj;
    } else {
      i::Isolate* isolate = i::Isolate::Current();
      LOG_API(isolate, "ToNumber");
      ENTER_V8(isolate);
      EXCEPTION_PREAMBLE(isolate);
      num = i::Execution::ToNumber(isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, Local<Number>());
    }
    return ToApiHandle<Number>(num);
  }
  
  
  Local<Integer> Value::ToInteger() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::Object> num;
    if (obj->IsSmi()) {
      num = obj;
    } else {
      i::Isolate* isolate = i::Isolate::Current();
      LOG_API(isolate, "ToInteger");
      ENTER_V8(isolate);
      EXCEPTION_PREAMBLE(isolate);
      num = i::Execution::ToInteger(isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, Local<Integer>());
    }
    return ToApiHandle<Integer>(num);
  }
  
  
  void i::Internals::CheckInitializedImpl(v8::Isolate* external_isolate) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(external_isolate);
    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::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->HasSpecificClassOf(isolate->heap()->Date_string()),
                    "v8::Date::Cast()",
                    "Could not convert to date");
  }
  
  
  void v8::StringObject::CheckCast(v8::Value* that) {
    i::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->HasSpecificClassOf(isolate->heap()->String_string()),
                    "v8::StringObject::Cast()",
                    "Could not convert to StringObject");
  }
  
  
  void v8::SymbolObject::CheckCast(v8::Value* that) {
    i::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->HasSpecificClassOf(isolate->heap()->Symbol_string()),
                    "v8::SymbolObject::Cast()",
                    "Could not convert to SymbolObject");
  }
  
  
  void v8::NumberObject::CheckCast(v8::Value* that) {
    i::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->HasSpecificClassOf(isolate->heap()->Number_string()),
                    "v8::NumberObject::Cast()",
                    "Could not convert to NumberObject");
  }
  
  
  void v8::BooleanObject::CheckCast(v8::Value* that) {
    i::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(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::Isolate::Current();
      LOG_API(isolate, "NumberValue");
      ENTER_V8(isolate);
      EXCEPTION_PREAMBLE(isolate);
      num = i::Execution::ToNumber(isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, i::OS::nan_value());
    }
    return num->Number();
  }
  
  
  int64_t Value::IntegerValue() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::Object> num;
    if (obj->IsNumber()) {
      num = obj;
    } else {
      i::Isolate* isolate = i::Isolate::Current();
      LOG_API(isolate, "IntegerValue");
      ENTER_V8(isolate);
      EXCEPTION_PREAMBLE(isolate);
      num = i::Execution::ToInteger(isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, 0);
    }
    if (num->IsSmi()) {
      return i::Smi::cast(*num)->value();
    } else {
      return static_cast<int64_t>(num->Number());
    }
  }
  
  
  Local<Int32> Value::ToInt32() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::Object> num;
    if (obj->IsSmi()) {
      num = obj;
    } else {
      i::Isolate* isolate = i::Isolate::Current();
      LOG_API(isolate, "ToInt32");
      ENTER_V8(isolate);
      EXCEPTION_PREAMBLE(isolate);
      num = i::Execution::ToInt32(isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, Local<Int32>());
    }
    return ToApiHandle<Int32>(num);
  }
  
  
  Local<Uint32> Value::ToUint32() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::Object> num;
    if (obj->IsSmi()) {
      num = obj;
    } else {
      i::Isolate* isolate = i::Isolate::Current();
      LOG_API(isolate, "ToUInt32");
      ENTER_V8(isolate);
      EXCEPTION_PREAMBLE(isolate);
      num = i::Execution::ToUint32(isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, Local<Uint32>());
    }
    return ToApiHandle<Uint32>(num);
  }
  
  
  Local<Uint32> Value::ToArrayIndex() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsSmi()) {
      if (i::Smi::cast(*obj)->value() >= 0) return Utils::Uint32ToLocal(obj);
      return Local<Uint32>();
    }
    i::Isolate* isolate = i::Isolate::Current();
    LOG_API(isolate, "ToArrayIndex");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> string_obj =
        i::Execution::ToString(isolate, obj, &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(isolate, Local<Uint32>());
    i::Handle<i::String> str = i::Handle<i::String>::cast(string_obj);
    uint32_t index;
    if (str->AsArrayIndex(&index)) {
      i::Handle<i::Object> value;
      if (index <= static_cast<uint32_t>(i::Smi::kMaxValue)) {
        value = i::Handle<i::Object>(i::Smi::FromInt(index), isolate);
      } else {
        value = isolate->factory()->NewNumber(index);
      }
      return Utils::Uint32ToLocal(value);
    }
    return Local<Uint32>();
  }
  
  
  int32_t Value::Int32Value() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsSmi()) {
      return i::Smi::cast(*obj)->value();
    } else {
      i::Isolate* isolate = i::Isolate::Current();
      LOG_API(isolate, "Int32Value (slow)");
      ENTER_V8(isolate);
      EXCEPTION_PREAMBLE(isolate);
      i::Handle<i::Object> num =
          i::Execution::ToInt32(isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, 0);
      if (num->IsSmi()) {
        return i::Smi::cast(*num)->value();
      } else {
        return static_cast<int32_t>(num->Number());
      }
    }
  }
  
  
  bool Value::Equals(Handle<Value> that) const {
    i::Isolate* isolate = i::Isolate::Current();
    if (!Utils::ApiCheck(this != NULL && !that.IsEmpty(),
                         "v8::Value::Equals()",
                         "Reading from empty handle")) {
      return false;
    }
    LOG_API(isolate, "Equals");
    ENTER_V8(isolate);
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::Object> other = Utils::OpenHandle(*that);
    // If both obj and other are JSObjects, we'd better compare by identity
    // immediately when going into JS builtin.  The reason is Invoke
    // would overwrite global object receiver with global proxy.
    if (obj->IsJSObject() && other->IsJSObject()) {
      return *obj == *other;
    }
    i::Handle<i::Object> args[] = { other };
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> result =
        CallV8HeapFunction("EQUALS", obj, ARRAY_SIZE(args), args,
                           &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(isolate, false);
    return *result == i::Smi::FromInt(i::EQUAL);
  }
  
  
  bool Value::StrictEquals(Handle<Value> that) const {
    i::Isolate* isolate = i::Isolate::Current();
    if (!Utils::ApiCheck(this != NULL && !that.IsEmpty(),
                         "v8::Value::StrictEquals()",
                         "Reading from empty handle")) {
      return false;
    }
    LOG_API(isolate, "StrictEquals");
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::Object> other = Utils::OpenHandle(*that);
    // Must check HeapNumber first, since NaN !== NaN.
    if (obj->IsHeapNumber()) {
      if (!other->IsNumber()) return false;
      double x = obj->Number();
      double y = other->Number();
      // 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::cast(*obj)->Equals(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::Isolate* isolate = i::Isolate::Current();
    if (!Utils::ApiCheck(this != NULL && !that.IsEmpty(),
                         "v8::Value::SameValue()",
                         "Reading from empty handle")) {
      return false;
    }
    LOG_API(isolate, "SameValue");
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    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::Isolate::Current();
      LOG_API(isolate, "Uint32Value");
      ENTER_V8(isolate);
      EXCEPTION_PREAMBLE(isolate);
      i::Handle<i::Object> num =
          i::Execution::ToUint32(isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, 0);
      if (num->IsSmi()) {
        return i::Smi::cast(*num)->value();
      } else {
        return static_cast<uint32_t>(num->Number());
      }
    }
  }
  
  
  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);
    i::Handle<i::Object> obj = i::Runtime::SetObjectProperty(
        isolate,
        self,
        key_obj,
        value_obj,
        static_cast<PropertyAttributes>(attribs),
        i::SLOPPY);
    has_pending_exception = obj.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);
    i::Handle<i::Object> obj = i::JSObject::SetElement(
        self,
        index,
        value_obj,
        NONE,
        i::SLOPPY);
    has_pending_exception = obj.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);
    i::Handle<i::Object> obj = i::ForceSetProperty(
        self,
        key_obj,
        value_obj,
        static_cast<PropertyAttributes>(attribs));
    has_pending_exception = obj.is_null();
    EXCEPTION_BAILOUT_CHECK(isolate, false);
    return true;
  }
  
  
  bool v8::Object::SetPrivate(v8::Handle<Private> key, v8::Handle<Value> value) {
    return Set(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 = i::ForceDeleteProperty(self, key_obj);
    has_pending_exception = obj.is_null();
    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 = i::GetProperty(isolate, self, key_obj);
    has_pending_exception = result.is_null();
    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 = i::Object::GetElement(isolate, self, index);
    has_pending_exception = result.is_null();
    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::GetPropertyAttribute()",
               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);
      key_obj = i::Execution::ToString(isolate, key_obj, &has_pending_exception);
      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::GetPropertyAttribute(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::Handle<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);
    bool threw = false;
    i::Handle<i::FixedArray> value =
        i::GetKeysInFixedArrayFor(self, i::INCLUDE_PROTOS, &threw);
    if (threw) return 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);
    bool threw = false;
    i::Handle<i::FixedArray> value =
        i::GetKeysInFixedArrayFor(self, i::LOCAL_ONLY, &threw);
    if (threw) return 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::OS::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::OS::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 = i::DeleteProperty(self, key_obj);
    has_pending_exception = obj.is_null();
    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 = i::HasProperty(self, key_obj);
    has_pending_exception = obj.is_null();
    EXCEPTION_BAILOUT_CHECK(isolate, false);
    return obj->IsTrue();
  }
  
  
  bool v8::Object::HasPrivate(v8::Handle<Private> key) {
    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);
    return i::JSReceiver::DeleteElement(self, index)->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 =
        i::JSObject::SetAccessor(Utils::OpenHandle(obj), info);
    if (result.is_null() || 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::HasLocalProperty(
        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);
    PropertyAttributes ignored;
    i::Handle<i::Object> result =
        i::Object::GetProperty(receiver, receiver, lookup, name,
                               &ignored);
    has_pending_exception = result.is_null();
    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 =
        isolate->factory()->CopyMap(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 = i::JSObject::Copy(self);
    has_pending_exception = result.is_null();
    EXCEPTION_BAILOUT_CHECK(isolate, Local<Object>());
    return Utils::ToLocal(result);
  }
  
  
  static i::Context* GetCreationContext(i::JSObject* object) {
    i::Object* constructor = object->map()->constructor();
    i::JSFunction* function;
    if (!constructor->IsJSFunction()) {
      // Functions have null as a constructor,
      // but any JSFunction knows its context immediately.
      ASSERT(object->IsJSFunction());
      function = i::JSFunction::cast(object);
    } else {
      function = i::JSFunction::cast(constructor);
    }
    return function->context()->native_context();
  }
  
  
  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 = GetCreationContext(*self);
    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::Handle<i::Smi>::cast(
        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));
  
    object->set_map(*external_array_map);
    object->set_elements(*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 = i::Execution::TryGetFunctionDelegate(
          isolate, obj, &has_pending_exception);
      EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
      fun = i::Handle<i::JSFunction>::cast(delegate);
      recv_obj = obj;
    }
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> returned = i::Execution::Call(
        isolate, fun, recv_obj, argc, args, &has_pending_exception, true);
    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 =
          i::Execution::New(fun, argc, args, &has_pending_exception);
      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 = i::Execution::TryGetConstructorDelegate(
        isolate, obj, &has_pending_exception);
    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 = i::Execution::Call(
          isolate, fun, obj, argc, args, &has_pending_exception);
      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 =
        i::Execution::New(function, argc, args, &has_pending_exception);
    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::Object* raw_result = NULL;
    {
      i::HandleScope scope(isolate);
      i::Handle<i::JSFunction> fun = Utils::OpenHandle(this);
      i::Handle<i::Object> recv_obj = Utils::OpenHandle(*recv);
      STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
      i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);
      EXCEPTION_PREAMBLE(isolate);
      i::Handle<i::Object> returned = i::Execution::Call(
          isolate, fun, recv_obj, argc, args, &has_pending_exception, true);
      EXCEPTION_BAILOUT_CHECK_DO_CALLBACK(isolate, Local<Object>());
      raw_result = *returned;
    }
    i::Handle<i::Object> result(raw_result, isolate);
    return Utils::ToLocal(result);
  }
  
  
  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 = GetScriptNameOrSourceURL(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::GetScriptLineNumber(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::GetScriptColumnNumber(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,
                                        replace_invalid_utf8_);
        if (written == 0) {
          early_termination_ = true;
          break;
        }
        buffer += written;
        remaining_capacity -= written;
        last_character = character;
      }
      // Write state back out to object.
      last_character_ = last_character;
      buffer_ = buffer;
      utf16_chars_read_ += i;
    }
  
    inline bool IsDone() {
      return early_termination_;
    }
  
    inline void VisitOneByteString(const uint8_t* chars, int length) {
      Visit(chars, length);
    }
  
    inline void VisitTwoByteString(const uint16_t* chars, int length) {
      Visit(chars, length);
    }
  
    int CompleteWrite(bool write_null, int* utf16_chars_read_out) {
      // Write out number of utf16 characters written to the stream.
      if (utf16_chars_read_out != NULL) {
        *utf16_chars_read_out = utf16_chars_read_;
      }
      // Only null terminate if all of the string was written and there's space.
      if (write_null &&
          !early_termination_ &&
          (capacity_ == -1 || (buffer_ - start_) < capacity_)) {
        *buffer_++ = '\0';
      }
      return static_cast<int>(buffer_ - start_);
    }
  
   private:
    bool early_termination_;
    int last_character_;
    char* buffer_;
    char* const start_;
    int capacity_;
    bool const skip_capacity_check_;
    bool const replace_invalid_utf8_;
    int utf16_chars_read_;
    DISALLOW_IMPLICIT_CONSTRUCTORS(Utf8WriterVisitor);
  };
  
  
  static bool RecursivelySerializeToUtf8(i::String* current,
                                         Utf8WriterVisitor* writer,
                                         int recursion_budget) {
    while (!writer->IsDone()) {
      i::ConsString* cons_string = i::String::VisitFlat(writer, current);
      if (cons_string == NULL) return true;  // Leaf node.
      if (recursion_budget <= 0) return false;
      // Must write the left branch first.
      i::String* first = cons_string->first();
      bool success = RecursivelySerializeToUtf8(first,
                                                writer,
                                                recursion_budget - 1);
      if (!success) return false;
      // Inline tail recurse for right branch.
      current = cons_string->second();
    }
    return true;
  }
  
  
  int String::WriteUtf8(char* buffer,
                        int capacity,
                        int* nchars_ref,
                        int options) const {
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    LOG_API(isolate, "String::WriteUtf8");
    ENTER_V8(isolate);
    i::Handle<i::String> str = Utils::OpenHandle(this);
    if (options & HINT_MANY_WRITES_EXPECTED) {
      FlattenString(str);  // Flatten the string for efficiency.
    }
    const int string_length = str->length();
    bool write_null = !(options & NO_NULL_TERMINATION);
    bool replace_invalid_utf8 = (options & REPLACE_INVALID_UTF8);
    int max16BitCodeUnitSize = unibrow::Utf8::kMax16BitCodeUnitSize;
    // First check if we can just write the string without checking capacity.
    if (capacity == -1 || capacity / max16BitCodeUnitSize >= string_length) {
      Utf8WriterVisitor writer(buffer, capacity, true, replace_invalid_utf8);
      const int kMaxRecursion = 100;
      bool success = RecursivelySerializeToUtf8(*str, &writer, kMaxRecursion);
      if (success) return writer.CompleteWrite(write_null, nchars_ref);
    } else if (capacity >= string_length) {
      // First check that the buffer is large enough.
      int utf8_bytes = v8::Utf8Length(*str, str->GetIsolate());
      if (utf8_bytes <= capacity) {
        // ASCII fast path.
        if (utf8_bytes == string_length) {
          WriteOneByte(reinterpret_cast<uint8_t*>(buffer), 0, capacity, options);
          if (nchars_ref != NULL) *nchars_ref = string_length;
          if (write_null && (utf8_bytes+1 <= capacity)) {
            return string_length + 1;
          }
          return string_length;
        }
        if (write_null && (utf8_bytes+1 > capacity)) {
          options |= NO_NULL_TERMINATION;
        }
        // Recurse once without a capacity limit.
        // This will get into the first branch above.
        // TODO(dcarney) Check max left rec. in Utf8Length and fall through.
        return WriteUtf8(buffer, -1, nchars_ref, options);
      }
    }
    // Recursive slow path can potentially be unreasonable slow. Flatten.
    str = FlattenGetString(str);
    Utf8WriterVisitor writer(buffer, capacity, false, replace_invalid_utf8);
    i::String::VisitFlat(&writer, *str);
    return writer.CompleteWrite(write_null, nchars_ref);
  }
  
  
  template<typename CharType>
  static inline int WriteHelper(const String* string,
                                CharType* buffer,
                                int start,
                                int length,
                                int options) {
    i::Isolate* isolate = Utils::OpenHandle(string)->GetIsolate();
    LOG_API(isolate, "String::Write");
    ENTER_V8(isolate);
    ASSERT(start >= 0 && length >= -1);
    i::Handle<i::String> str = Utils::OpenHandle(string);
    isolate->string_tracker()->RecordWrite(str);
    if (options & String::HINT_MANY_WRITES_EXPECTED) {
      // Flatten the string for efficiency.  This applies whether we are
      // using StringCharacterStream or Get(i) to access the characters.
      FlattenString(str);
    }
    int end = start + length;
    if ((length == -1) || (length > str->length() - start) )
      end = str->length();
    if (end < 0) return 0;
    i::String::WriteToFlat(*str, buffer, start, end);
    if (!(options & String::NO_NULL_TERMINATION) &&
        (length == -1 || end - start < length)) {
      buffer[end - start] = '\0';
    }
    return end - start;
  }
  
  
  int String::WriteOneByte(uint8_t* buffer,
                           int start,
                           int length,
                           int options) const {
    return WriteHelper(this, buffer, start, length, options);
  }
  
  
  int String::Write(uint16_t* buffer,
                    int start,
                    int length,
                    int options) const {
    return WriteHelper(this, buffer, start, length, options);
  }
  
  
  bool v8::String::IsExternal() const {
    i::Handle<i::String> str = Utils::OpenHandle(this);
    EnsureInitializedForIsolate(str->GetIsolate(), "v8::String::IsExternal()");
    return i::StringShape(*str).IsExternalTwoByte();
  }
  
  
  bool v8::String::IsExternalAscii() const {
    i::Handle<i::String> str = Utils::OpenHandle(this);
    return i::StringShape(*str).IsExternalAscii();
  }
  
  
  void v8::String::VerifyExternalStringResource(
      v8::String::ExternalStringResource* value) const {
    i::Handle<i::String> str = Utils::OpenHandle(this);
    const v8::String::ExternalStringResource* expected;
    if (i::StringShape(*str).IsExternalTwoByte()) {
      const void* resource =
          i::Handle<i::ExternalTwoByteString>::cast(str)->resource();
      expected = reinterpret_cast<const ExternalStringResource*>(resource);
    } else {
      expected = NULL;
    }
    CHECK_EQ(expected, value);
  }
  
  void v8::String::VerifyExternalStringResourceBase(
      v8::String::ExternalStringResourceBase* value, Encoding encoding) const {
    i::Handle<i::String> str = Utils::OpenHandle(this);
    const v8::String::ExternalStringResourceBase* expected;
    Encoding expectedEncoding;
    if (i::StringShape(*str).IsExternalAscii()) {
      const void* resource =
          i::Handle<i::ExternalAsciiString>::cast(str)->resource();
      expected = reinterpret_cast<const ExternalStringResourceBase*>(resource);
      expectedEncoding = ASCII_ENCODING;
    } else if (i::StringShape(*str).IsExternalTwoByte()) {
      const void* resource =
          i::Handle<i::ExternalTwoByteString>::cast(str)->resource();
      expected = reinterpret_cast<const ExternalStringResourceBase*>(resource);
      expectedEncoding = TWO_BYTE_ENCODING;
    } else {
      expected = NULL;
      expectedEncoding = str->IsOneByteRepresentation() ? ASCII_ENCODING
          : TWO_BYTE_ENCODING;
    }
    CHECK_EQ(expected, value);
    CHECK_EQ(expectedEncoding, encoding);
  }
  
  const v8::String::ExternalAsciiStringResource*
  v8::String::GetExternalAsciiStringResource() const {
    i::Handle<i::String> str = Utils::OpenHandle(this);
    if (i::StringShape(*str).IsExternalAscii()) {
      const void* resource =
          i::Handle<i::ExternalAsciiString>::cast(str)->resource();
      return reinterpret_cast<const ExternalAsciiStringResource*>(resource);
    } else {
      return NULL;
    }
  }
  
  
  Local<Value> Symbol::Name() const {
    i::Handle<i::Symbol> sym = Utils::OpenHandle(this);
    i::Handle<i::Object> name(sym->name(), sym->GetIsolate());
    return Utils::ToLocal(name);
  }
  
  
  Local<Value> Private::Name() const {
    return reinterpret_cast<const Symbol*>(this)->Name();
  }
  
  
  double Number::Value() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    return obj->Number();
  }
  
  
  bool Boolean::Value() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    return obj->IsTrue();
  }
  
  
  int64_t Integer::Value() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsSmi()) {
      return i::Smi::cast(*obj)->value();
    } else {
      return static_cast<int64_t>(obj->Number());
    }
  }
  
  
  int32_t Int32::Value() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsSmi()) {
      return i::Smi::cast(*obj)->value();
    } else {
      return static_cast<int32_t>(obj->Number());
    }
  }
  
  
  uint32_t Uint32::Value() const {
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsSmi()) {
      return i::Smi::cast(*obj)->value();
    } else {
      return static_cast<uint32_t>(obj->Number());
    }
  }
  
  
  int v8::Object::InternalFieldCount() {
    i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
    return obj->GetInternalFieldCount();
  }
  
  
  static bool InternalFieldOK(i::Handle<i::JSObject> obj,
                              int index,
                              const char* location) {
    return Utils::ApiCheck(index < obj->GetInternalFieldCount(),
                           location,
                           "Internal field out of bounds");
  }
  
  
  Local<Value> v8::Object::SlowGetInternalField(int index) {
    i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
    const char* location = "v8::Object::GetInternalField()";
    if (!InternalFieldOK(obj, index, location)) return Local<Value>();
    i::Handle<i::Object> value(obj->GetInternalField(index), obj->GetIsolate());
    return Utils::ToLocal(value);
  }
  
  
  void v8::Object::SetInternalField(int index, v8::Handle<Value> value) {
    i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
    const char* location = "v8::Object::SetInternalField()";
    if (!InternalFieldOK(obj, index, location)) return;
    i::Handle<i::Object> val = Utils::OpenHandle(*value);
    obj->SetInternalField(index, *val);
    ASSERT_EQ(value, GetInternalField(index));
  }
  
  
  void* v8::Object::SlowGetAlignedPointerFromInternalField(int index) {
    i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
    const char* location = "v8::Object::GetAlignedPointerFromInternalField()";
    if (!InternalFieldOK(obj, index, location)) return NULL;
    return DecodeSmiToAligned(obj->GetInternalField(index), location);
  }
  
  
  void v8::Object::SetAlignedPointerInInternalField(int index, void* value) {
    i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
    const char* location = "v8::Object::SetAlignedPointerInInternalField()";
    if (!InternalFieldOK(obj, index, location)) return;
    obj->SetInternalField(index, EncodeAlignedAsSmi(value, location));
    ASSERT_EQ(value, GetAlignedPointerFromInternalField(index));
  }
  
  
  static void* ExternalValue(i::Object* obj) {
    // Obscure semantics for undefined, but somehow checked in our unit tests...
    if (obj->IsUndefined()) return NULL;
    i::Object* foreign = i::JSObject::cast(obj)->GetInternalField(0);
    return i::Foreign::cast(foreign)->foreign_address();
  }
  
  
  // --- E n v i r o n m e n t ---
  
  
  void v8::V8::InitializePlatform(Platform* platform) {
  #ifdef V8_USE_DEFAULT_PLATFORM
    FATAL("Can't override v8::Platform when using default implementation");
  #else
    i::V8::InitializePlatform(platform);
  #endif
  }
  
  
  void v8::V8::ShutdownPlatform() {
  #ifdef V8_USE_DEFAULT_PLATFORM
    FATAL("Can't override v8::Platform when using default implementation");
  #else
    i::V8::ShutdownPlatform();
  #endif
  }
  
  
  bool v8::V8::Initialize() {
    i::Isolate* isolate = i::Isolate::UncheckedCurrent();
    if (isolate != NULL && isolate->IsInitialized()) {
      return true;
    }
    return InitializeHelper(isolate);
  }
  
  
  void v8::V8::SetEntropySource(EntropySource entropy_source) {
    i::RandomNumberGenerator::SetEntropySource(entropy_source);
  }
  
  
  void v8::V8::SetReturnAddressLocationResolver(
      ReturnAddressLocationResolver return_address_resolver) {
    i::V8::SetReturnAddressLocationResolver(return_address_resolver);
  }
  
  
  bool v8::V8::SetFunctionEntryHook(Isolate* ext_isolate,
                                    FunctionEntryHook entry_hook) {
    ASSERT(ext_isolate != NULL);
    ASSERT(entry_hook != NULL);
  
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(ext_isolate);
  
    // The entry hook can only be set before the Isolate is initialized, as
    // otherwise the Isolate's code stubs generated at initialization won't
    // contain entry hooks.
    if (isolate->IsInitialized())
      return false;
  
    // Setting an entry hook is a one-way operation, once set, it cannot be
    // changed or unset.
    if (isolate->function_entry_hook() != NULL)
      return false;
  
    isolate->set_function_entry_hook(entry_hook);
    return true;
  }
  
  
  void v8::V8::SetJitCodeEventHandler(
      JitCodeEventOptions options, JitCodeEventHandler event_handler) {
    i::Isolate* isolate = i::Isolate::Current();
    // Ensure that logging is initialized for our isolate.
    isolate->InitializeLoggingAndCounters();
    isolate->logger()->SetCodeEventHandler(options, event_handler);
  }
  
  void v8::V8::SetArrayBufferAllocator(
      ArrayBuffer::Allocator* allocator) {
    if (!Utils::ApiCheck(i::V8::ArrayBufferAllocator() == NULL,
                         "v8::V8::SetArrayBufferAllocator",
                         "ArrayBufferAllocator might only be set once"))
      return;
    i::V8::SetArrayBufferAllocator(allocator);
  }
  
  
  bool v8::V8::Dispose() {
    i::Isolate* isolate = i::Isolate::Current();
    if (!Utils::ApiCheck(isolate != NULL && isolate->IsDefaultIsolate(),
                         "v8::V8::Dispose()",
                         "Use v8::Isolate::Dispose() for non-default isolate.")) {
      return false;
    }
    i::V8::TearDown();
    return true;
  }
  
  
  HeapStatistics::HeapStatistics(): total_heap_size_(0),
                                    total_heap_size_executable_(0),
                                    total_physical_size_(0),
                                    used_heap_size_(0),
                                    heap_size_limit_(0) { }
  
  
  void v8::V8::VisitExternalResources(ExternalResourceVisitor* visitor) {
    i::Isolate* isolate = i::Isolate::Current();
    isolate->heap()->VisitExternalResources(visitor);
  }
  
  
  class VisitorAdapter : public i::ObjectVisitor {
   public:
    explicit VisitorAdapter(PersistentHandleVisitor* visitor)
        : visitor_(visitor) {}
    virtual void VisitPointers(i::Object** start, i::Object** end) {
      UNREACHABLE();
    }
    virtual void VisitEmbedderReference(i::Object** p, uint16_t class_id) {
      Value* value = ToApi<Value>(i::Handle<i::Object>(p));
      visitor_->VisitPersistentHandle(
          reinterpret_cast<Persistent<Value>*>(&value), class_id);
    }
   private:
    PersistentHandleVisitor* visitor_;
  };
  
  
  void v8::V8::VisitHandlesWithClassIds(PersistentHandleVisitor* visitor) {
    i::Isolate* isolate = i::Isolate::Current();
    i::DisallowHeapAllocation no_allocation;
  
    VisitorAdapter visitor_adapter(visitor);
    isolate->global_handles()->IterateAllRootsWithClassIds(&visitor_adapter);
  }
  
  
  void v8::V8::VisitHandlesForPartialDependence(
      Isolate* exported_isolate, PersistentHandleVisitor* visitor) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(exported_isolate);
    ASSERT(isolate == i::Isolate::Current());
    i::DisallowHeapAllocation no_allocation;
  
    VisitorAdapter visitor_adapter(visitor);
    isolate->global_handles()->IterateAllRootsInNewSpaceWithClassIds(
        &visitor_adapter);
  }
  
  
  bool v8::V8::IdleNotification(int hint) {
    // Returning true tells the caller that it need not
    // continue to call IdleNotification.
    i::Isolate* isolate = i::Isolate::Current();
    if (isolate == NULL || !isolate->IsInitialized()) return true;
    if (!i::FLAG_use_idle_notification) return true;
    return isolate->heap()->IdleNotification(hint);
  }
  
  
  void v8::V8::LowMemoryNotification() {
    i::Isolate* isolate = i::Isolate::Current();
    if (isolate == NULL || !isolate->IsInitialized()) return;
    isolate->heap()->CollectAllAvailableGarbage("low memory notification");
  }
  
  
  int v8::V8::ContextDisposedNotification() {
    i::Isolate* isolate = i::Isolate::Current();
    if (!isolate->IsInitialized()) return 0;
    return isolate->heap()->NotifyContextDisposed();
  }
  
  
  bool v8::V8::InitializeICU(const char* icu_data_file) {
    return i::InitializeICU(icu_data_file);
  }
  
  
  const char* v8::V8::GetVersion() {
    return i::Version::GetVersion();
  }
  
  
  static i::Handle<i::Context> CreateEnvironment(
      i::Isolate* isolate,
      v8::ExtensionConfiguration* extensions,
      v8::Handle<ObjectTemplate> global_template,
      v8::Handle<Value> global_object) {
    i::Handle<i::Context> env;
  
    // Enter V8 via an ENTER_V8 scope.
    {
      ENTER_V8(isolate);
      v8::Handle<ObjectTemplate> proxy_template = global_template;
      i::Handle<i::FunctionTemplateInfo> proxy_constructor;
      i::Handle<i::FunctionTemplateInfo> global_constructor;
  
      if (!global_template.IsEmpty()) {
        // Make sure that the global_template has a constructor.
        global_constructor = EnsureConstructor(isolate, *global_template);
  
        // Create a fresh template for the global proxy object.
        proxy_template = ObjectTemplate::New(
            reinterpret_cast<v8::Isolate*>(isolate));
        proxy_constructor = EnsureConstructor(isolate, *proxy_template);
  
        // Set the global template to be the prototype template of
        // global proxy template.
        proxy_constructor->set_prototype_template(
            *Utils::OpenHandle(*global_template));
  
        // Migrate security handlers from global_template to
        // proxy_template.  Temporarily removing access check
        // information from the global template.
        if (!global_constructor->access_check_info()->IsUndefined()) {
          proxy_constructor->set_access_check_info(
              global_constructor->access_check_info());
          proxy_constructor->set_needs_access_check(
              global_constructor->needs_access_check());
          global_constructor->set_needs_access_check(false);
          global_constructor->set_access_check_info(
              isolate->heap()->undefined_value());
        }
      }
  
      // Create the environment.
      env = isolate->bootstrapper()->CreateEnvironment(
          Utils::OpenHandle(*global_object, true),
          proxy_template,
          extensions);
  
      // Restore the access check info on the global template.
      if (!global_template.IsEmpty()) {
        ASSERT(!global_constructor.is_null());
        ASSERT(!proxy_constructor.is_null());
        global_constructor->set_access_check_info(
            proxy_constructor->access_check_info());
        global_constructor->set_needs_access_check(
            proxy_constructor->needs_access_check());
      }
    }
    // Leave V8.
  
    return env;
  }
  
  Local<Context> v8::Context::New(
      v8::Isolate* external_isolate,
      v8::ExtensionConfiguration* extensions,
      v8::Handle<ObjectTemplate> global_template,
      v8::Handle<Value> global_object) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(external_isolate);
    EnsureInitializedForIsolate(isolate, "v8::Context::New()");
    LOG_API(isolate, "Context::New");
    ON_BAILOUT(isolate, "v8::Context::New()", return Local<Context>());
    i::HandleScope scope(isolate);
    ExtensionConfiguration no_extensions;
    if (extensions == NULL) extensions = &no_extensions;
    i::Handle<i::Context> env =
        CreateEnvironment(isolate, extensions, global_template, global_object);
    if (env.is_null()) return Local<Context>();
    return Utils::ToLocal(scope.CloseAndEscape(env));
  }
  
  
  void v8::Context::SetSecurityToken(Handle<Value> token) {
    i::Isolate* isolate = i::Isolate::Current();
    ENTER_V8(isolate);
    i::Handle<i::Context> env = Utils::OpenHandle(this);
    i::Handle<i::Object> token_handle = Utils::OpenHandle(*token);
    env->set_security_token(*token_handle);
  }
  
  
  void v8::Context::UseDefaultSecurityToken() {
    i::Isolate* isolate = i::Isolate::Current();
    ENTER_V8(isolate);
    i::Handle<i::Context> env = Utils::OpenHandle(this);
    env->set_security_token(env->global_object());
  }
  
  
  Handle<Value> v8::Context::GetSecurityToken() {
    i::Isolate* isolate = i::Isolate::Current();
    i::Handle<i::Context> env = Utils::OpenHandle(this);
    i::Object* security_token = env->security_token();
    i::Handle<i::Object> token_handle(security_token, isolate);
    return Utils::ToLocal(token_handle);
  }
  
  
  v8::Isolate* Context::GetIsolate() {
    i::Handle<i::Context> env = Utils::OpenHandle(this);
    return reinterpret_cast<Isolate*>(env->GetIsolate());
  }
  
  
  v8::Local<v8::Object> Context::Global() {
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    i::Isolate* isolate = context->GetIsolate();
    i::Handle<i::Object> global(context->global_proxy(), isolate);
    // TODO(dcarney): This should always return the global proxy
    // but can't presently as calls to GetProtoype will return the wrong result.
    if (i::Handle<i::JSGlobalProxy>::cast(
            global)->IsDetachedFrom(context->global_object())) {
      global = i::Handle<i::Object>(context->global_object(), isolate);
    }
    return Utils::ToLocal(i::Handle<i::JSObject>::cast(global));
  }
  
  
  void Context::DetachGlobal() {
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    i::Isolate* isolate = context->GetIsolate();
    ENTER_V8(isolate);
    isolate->bootstrapper()->DetachGlobal(context);
  }
  
  
  void Context::AllowCodeGenerationFromStrings(bool allow) {
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    i::Isolate* isolate = context->GetIsolate();
    ENTER_V8(isolate);
    context->set_allow_code_gen_from_strings(
        allow ? isolate->heap()->true_value() : isolate->heap()->false_value());
  }
  
  
  bool Context::IsCodeGenerationFromStringsAllowed() {
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    return !context->allow_code_gen_from_strings()->IsFalse();
  }
  
  
  void Context::SetErrorMessageForCodeGenerationFromStrings(
      Handle<String> error) {
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    i::Handle<i::String> error_handle = Utils::OpenHandle(*error);
    context->set_error_message_for_code_gen_from_strings(*error_handle);
  }
  
  
  Local<v8::Object> ObjectTemplate::NewInstance() {
    i::Isolate* isolate = i::Isolate::Current();
    ON_BAILOUT(isolate, "v8::ObjectTemplate::NewInstance()",
               return Local<v8::Object>());
    LOG_API(isolate, "ObjectTemplate::NewInstance");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> obj =
        i::Execution::InstantiateObject(Utils::OpenHandle(this),
                                        &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Object>());
    return Utils::ToLocal(i::Handle<i::JSObject>::cast(obj));
  }
  
  
  Local<v8::Function> FunctionTemplate::GetFunction() {
    i::Isolate* isolate = i::Isolate::Current();
    ON_BAILOUT(isolate, "v8::FunctionTemplate::GetFunction()",
               return Local<v8::Function>());
    LOG_API(isolate, "FunctionTemplate::GetFunction");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> obj =
        i::Execution::InstantiateFunction(Utils::OpenHandle(this),
                                          &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::Function>());
    return Utils::ToLocal(i::Handle<i::JSFunction>::cast(obj));
  }
  
  
  bool FunctionTemplate::HasInstance(v8::Handle<v8::Value> value) {
    ON_BAILOUT(i::Isolate::Current(), "v8::FunctionTemplate::HasInstanceOf()",
               return false);
    i::Object* obj = *Utils::OpenHandle(*value);
    return Utils::OpenHandle(this)->IsTemplateFor(obj);
  }
  
  
  Local<External> v8::External::New(Isolate* isolate, void* value) {
    STATIC_ASSERT(sizeof(value) == sizeof(i::Address));
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::External::New()");
    LOG_API(i_isolate, "External::New");
    ENTER_V8(i_isolate);
    i::Handle<i::JSObject> external = i_isolate->factory()->NewExternal(value);
    return Utils::ExternalToLocal(external);
  }
  
  
  void* External::Value() const {
    return ExternalValue(*Utils::OpenHandle(this));
  }
  
  
  // anonymous namespace for string creation helper functions
  namespace {
  
  inline int StringLength(const char* string) {
    return i::StrLength(string);
  }
  
  
  inline int StringLength(const uint8_t* string) {
    return i::StrLength(reinterpret_cast<const char*>(string));
  }
  
  
  inline int StringLength(const uint16_t* string) {
    int length = 0;
    while (string[length] != '\0')
      length++;
    return length;
  }
  
  
  inline i::Handle<i::String> NewString(i::Factory* factory,
                                        String::NewStringType type,
                                        i::Vector<const char> string) {
    if (type ==String::kInternalizedString) {
      return factory->InternalizeUtf8String(string);
    }
    return factory->NewStringFromUtf8(string);
  }
  
  
  inline i::Handle<i::String> NewString(i::Factory* factory,
                                        String::NewStringType type,
                                        i::Vector<const uint8_t> string) {
    if (type == String::kInternalizedString) {
      return factory->InternalizeOneByteString(string);
    }
    return factory->NewStringFromOneByte(string);
  }
  
  
  inline i::Handle<i::String> NewString(i::Factory* factory,
                                        String::NewStringType type,
                                        i::Vector<const uint16_t> string) {
    if (type == String::kInternalizedString) {
      return factory->InternalizeTwoByteString(string);
    }
    return factory->NewStringFromTwoByte(string);
  }
  
  
  template<typename Char>
  inline Local<String> NewString(Isolate* v8_isolate,
                                 const char* location,
                                 const char* env,
                                 const Char* data,
                                 String::NewStringType type,
                                 int length) {
    i::Isolate* isolate = reinterpret_cast<internal::Isolate*>(v8_isolate);
    EnsureInitializedForIsolate(isolate, location);
    LOG_API(isolate, env);
    if (length == 0 && type != String::kUndetectableString) {
      return String::Empty(v8_isolate);
    }
    ENTER_V8(isolate);
    if (length == -1) length = StringLength(data);
    i::Handle<i::String> result = NewString(
        isolate->factory(), type, i::Vector<const Char>(data, length));
    // We do not expect this to fail. Change this if it does.
    CHECK(!result.is_null());
    if (type == String::kUndetectableString) {
      result->MarkAsUndetectable();
    }
    return Utils::ToLocal(result);
  }
  
  }  // anonymous namespace
  
  
  Local<String> String::NewFromUtf8(Isolate* isolate,
                                    const char* data,
                                    NewStringType type,
                                    int length) {
    return NewString(isolate,
                     "v8::String::NewFromUtf8()",
                     "String::NewFromUtf8",
                     data,
                     type,
                     length);
  }
  
  
  Local<String> String::NewFromOneByte(Isolate* isolate,
                                       const uint8_t* data,
                                       NewStringType type,
                                       int length) {
    return NewString(isolate,
                     "v8::String::NewFromOneByte()",
                     "String::NewFromOneByte",
                     data,
                     type,
                     length);
  }
  
  
  Local<String> String::NewFromTwoByte(Isolate* isolate,
                                       const uint16_t* data,
                                       NewStringType type,
                                       int length) {
    return NewString(isolate,
                     "v8::String::NewFromTwoByte()",
                     "String::NewFromTwoByte",
                     data,
                     type,
                     length);
  }
  
  
  Local<String> v8::String::Concat(Handle<String> left, Handle<String> right) {
    i::Handle<i::String> left_string = Utils::OpenHandle(*left);
    i::Isolate* isolate = left_string->GetIsolate();
    EnsureInitializedForIsolate(isolate, "v8::String::New()");
    LOG_API(isolate, "String::New(char)");
    ENTER_V8(isolate);
    i::Handle<i::String> right_string = Utils::OpenHandle(*right);
    i::Handle<i::String> result = isolate->factory()->NewConsString(left_string,
                                                                    right_string);
    // We do not expect this to fail. Change this if it does.
    CHECK(!result.is_null());
    return Utils::ToLocal(result);
  }
  
  
  static i::Handle<i::String> NewExternalStringHandle(
      i::Isolate* isolate,
      v8::String::ExternalStringResource* resource) {
    i::Handle<i::String> result =
        isolate->factory()->NewExternalStringFromTwoByte(resource);
    // We do not expect this to fail. Change this if it does.
    CHECK(!result.is_null());
    return result;
  }
  
  
  static i::Handle<i::String> NewExternalAsciiStringHandle(
      i::Isolate* isolate,
      v8::String::ExternalAsciiStringResource* resource) {
    i::Handle<i::String> result =
        isolate->factory()->NewExternalStringFromAscii(resource);
    // We do not expect this to fail. Change this if it does.
    CHECK(!result.is_null());
    return result;
  }
  
  
  Local<String> v8::String::NewExternal(
      Isolate* isolate,
      v8::String::ExternalStringResource* resource) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::String::NewExternal()");
    LOG_API(i_isolate, "String::NewExternal");
    ENTER_V8(i_isolate);
    CHECK(resource && resource->data());
    i::Handle<i::String> result = NewExternalStringHandle(i_isolate, resource);
    i_isolate->heap()->external_string_table()->AddString(*result);
    return Utils::ToLocal(result);
  }
  
  
  bool v8::String::MakeExternal(v8::String::ExternalStringResource* resource) {
    i::Handle<i::String> obj = Utils::OpenHandle(this);
    i::Isolate* isolate = obj->GetIsolate();
    if (i::StringShape(*obj).IsExternalTwoByte()) {
      return false;  // Already an external string.
    }
    ENTER_V8(isolate);
    if (isolate->string_tracker()->IsFreshUnusedString(obj)) {
      return false;
    }
    if (isolate->heap()->IsInGCPostProcessing()) {
      return false;
    }
    CHECK(resource && resource->data());
  
    bool result = obj->MakeExternal(resource);
    if (result) {
      ASSERT(obj->IsExternalString());
      isolate->heap()->external_string_table()->AddString(*obj);
    }
    return result;
  }
  
  
  Local<String> v8::String::NewExternal(
      Isolate* isolate,
      v8::String::ExternalAsciiStringResource* resource) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::String::NewExternal()");
    LOG_API(i_isolate, "String::NewExternal");
    ENTER_V8(i_isolate);
    CHECK(resource && resource->data());
    i::Handle<i::String> result =
        NewExternalAsciiStringHandle(i_isolate, resource);
    i_isolate->heap()->external_string_table()->AddString(*result);
    return Utils::ToLocal(result);
  }
  
  
  bool v8::String::MakeExternal(
      v8::String::ExternalAsciiStringResource* resource) {
    i::Handle<i::String> obj = Utils::OpenHandle(this);
    i::Isolate* isolate = obj->GetIsolate();
    if (i::StringShape(*obj).IsExternalTwoByte()) {
      return false;  // Already an external string.
    }
    ENTER_V8(isolate);
    if (isolate->string_tracker()->IsFreshUnusedString(obj)) {
      return false;
    }
    if (isolate->heap()->IsInGCPostProcessing()) {
      return false;
    }
    CHECK(resource && resource->data());
  
    bool result = obj->MakeExternal(resource);
    if (result) {
      ASSERT(obj->IsExternalString());
      isolate->heap()->external_string_table()->AddString(*obj);
    }
    return result;
  }
  
  
  bool v8::String::CanMakeExternal() {
    if (!internal::FLAG_clever_optimizations) return false;
    i::Handle<i::String> obj = Utils::OpenHandle(this);
    i::Isolate* isolate = obj->GetIsolate();
  
    // TODO(yangguo): Externalizing sliced/cons strings allocates.
    // This rule can be removed when all code that can
    // trigger an access check is handlified and therefore GC safe.
    if (isolate->heap()->old_pointer_space()->Contains(*obj)) return false;
  
    if (isolate->string_tracker()->IsFreshUnusedString(obj)) return false;
    int size = obj->Size();  // Byte size of the original string.
    if (size < i::ExternalString::kShortSize) return false;
    i::StringShape shape(*obj);
    return !shape.IsExternal();
  }
  
  
  Local<v8::Object> v8::Object::New(Isolate* isolate) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::Object::New()");
    LOG_API(i_isolate, "Object::New");
    ENTER_V8(i_isolate);
    i::Handle<i::JSObject> obj =
        i_isolate->factory()->NewJSObject(i_isolate->object_function());
    return Utils::ToLocal(obj);
  }
  
  
  Local<v8::Value> v8::NumberObject::New(Isolate* isolate, double value) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::NumberObject::New()");
    LOG_API(i_isolate, "NumberObject::New");
    ENTER_V8(i_isolate);
    i::Handle<i::Object> number = i_isolate->factory()->NewNumber(value);
    i::Handle<i::Object> obj = i_isolate->factory()->ToObject(number);
    return Utils::ToLocal(obj);
  }
  
  
  double v8::NumberObject::ValueOf() const {
    i::Isolate* isolate = i::Isolate::Current();
    LOG_API(isolate, "NumberObject::NumberValue");
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
    return jsvalue->value()->Number();
  }
  
  
  Local<v8::Value> v8::BooleanObject::New(bool value) {
    i::Isolate* isolate = i::Isolate::Current();
    EnsureInitializedForIsolate(isolate, "v8::BooleanObject::New()");
    LOG_API(isolate, "BooleanObject::New");
    ENTER_V8(isolate);
    i::Handle<i::Object> boolean(value
                                 ? isolate->heap()->true_value()
                                 : isolate->heap()->false_value(),
                                 isolate);
    i::Handle<i::Object> obj = isolate->factory()->ToObject(boolean);
    return Utils::ToLocal(obj);
  }
  
  
  bool v8::BooleanObject::ValueOf() const {
    i::Isolate* isolate = i::Isolate::Current();
    LOG_API(isolate, "BooleanObject::BooleanValue");
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
    return jsvalue->value()->IsTrue();
  }
  
  
  Local<v8::Value> v8::StringObject::New(Handle<String> value) {
    i::Isolate* isolate = i::Isolate::Current();
    EnsureInitializedForIsolate(isolate, "v8::StringObject::New()");
    LOG_API(isolate, "StringObject::New");
    ENTER_V8(isolate);
    i::Handle<i::Object> obj =
        isolate->factory()->ToObject(Utils::OpenHandle(*value));
    return Utils::ToLocal(obj);
  }
  
  
  Local<v8::String> v8::StringObject::ValueOf() const {
    i::Isolate* isolate = i::Isolate::Current();
    LOG_API(isolate, "StringObject::StringValue");
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
    return Utils::ToLocal(
        i::Handle<i::String>(i::String::cast(jsvalue->value())));
  }
  
  
  Local<v8::Value> v8::SymbolObject::New(Isolate* isolate, Handle<Symbol> value) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::SymbolObject::New()");
    LOG_API(i_isolate, "SymbolObject::New");
    ENTER_V8(i_isolate);
    i::Handle<i::Object> obj =
        i_isolate->factory()->ToObject(Utils::OpenHandle(*value));
    return Utils::ToLocal(obj);
  }
  
  
  Local<v8::Symbol> v8::SymbolObject::ValueOf() const {
    i::Isolate* isolate = i::Isolate::Current();
    LOG_API(isolate, "SymbolObject::SymbolValue");
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
    return Utils::ToLocal(
        i::Handle<i::Symbol>(i::Symbol::cast(jsvalue->value())));
  }
  
  
  Local<v8::Value> v8::Date::New(Isolate* isolate, double time) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::Date::New()");
    LOG_API(i_isolate, "Date::New");
    if (std::isnan(time)) {
      // Introduce only canonical NaN value into the VM, to avoid signaling NaNs.
      time = i::OS::nan_value();
    }
    ENTER_V8(i_isolate);
    EXCEPTION_PREAMBLE(i_isolate);
    i::Handle<i::Object> obj =
        i::Execution::NewDate(i_isolate, time, &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(i_isolate, Local<v8::Value>());
    return Utils::ToLocal(obj);
  }
  
  
  double v8::Date::ValueOf() const {
    i::Isolate* isolate = i::Isolate::Current();
    LOG_API(isolate, "Date::NumberValue");
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::JSDate> jsdate = i::Handle<i::JSDate>::cast(obj);
    return jsdate->value()->Number();
  }
  
  
  void v8::Date::DateTimeConfigurationChangeNotification(Isolate* isolate) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    if (!i_isolate->IsInitialized()) return;
    ON_BAILOUT(i_isolate, "v8::Date::DateTimeConfigurationChangeNotification()",
               return);
    LOG_API(i_isolate, "Date::DateTimeConfigurationChangeNotification");
    ENTER_V8(i_isolate);
  
    i_isolate->date_cache()->ResetDateCache();
  
    if (!i_isolate->eternal_handles()->Exists(
            i::EternalHandles::DATE_CACHE_VERSION)) {
      return;
    }
    i::Handle<i::FixedArray> date_cache_version =
        i::Handle<i::FixedArray>::cast(i_isolate->eternal_handles()->GetSingleton(
            i::EternalHandles::DATE_CACHE_VERSION));
    ASSERT_EQ(1, date_cache_version->length());
    CHECK(date_cache_version->get(0)->IsSmi());
    date_cache_version->set(
        0,
        i::Smi::FromInt(i::Smi::cast(date_cache_version->get(0))->value() + 1));
  }
  
  
  static i::Handle<i::String> RegExpFlagsToString(RegExp::Flags flags) {
    i::Isolate* isolate = i::Isolate::Current();
    uint8_t flags_buf[3];
    int num_flags = 0;
    if ((flags & RegExp::kGlobal) != 0) flags_buf[num_flags++] = 'g';
    if ((flags & RegExp::kMultiline) != 0) flags_buf[num_flags++] = 'm';
    if ((flags & RegExp::kIgnoreCase) != 0) flags_buf[num_flags++] = 'i';
    ASSERT(num_flags <= static_cast<int>(ARRAY_SIZE(flags_buf)));
    return isolate->factory()->InternalizeOneByteString(
        i::Vector<const uint8_t>(flags_buf, num_flags));
  }
  
  
  Local<v8::RegExp> v8::RegExp::New(Handle<String> pattern,
                                    Flags flags) {
    i::Isolate* isolate = Utils::OpenHandle(*pattern)->GetIsolate();
    EnsureInitializedForIsolate(isolate, "v8::RegExp::New()");
    LOG_API(isolate, "RegExp::New");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::JSRegExp> obj = i::Execution::NewJSRegExp(
        Utils::OpenHandle(*pattern),
        RegExpFlagsToString(flags),
        &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(isolate, Local<v8::RegExp>());
    return Utils::ToLocal(i::Handle<i::JSRegExp>::cast(obj));
  }
  
  
  Local<v8::String> v8::RegExp::GetSource() const {
    i::Handle<i::JSRegExp> obj = Utils::OpenHandle(this);
    return Utils::ToLocal(i::Handle<i::String>(obj->Pattern()));
  }
  
  
  // Assert that the static flags cast in GetFlags is valid.
  #define REGEXP_FLAG_ASSERT_EQ(api_flag, internal_flag)          \
    STATIC_ASSERT(static_cast<int>(v8::RegExp::api_flag) ==       \
                  static_cast<int>(i::JSRegExp::internal_flag))
  REGEXP_FLAG_ASSERT_EQ(kNone, NONE);
  REGEXP_FLAG_ASSERT_EQ(kGlobal, GLOBAL);
  REGEXP_FLAG_ASSERT_EQ(kIgnoreCase, IGNORE_CASE);
  REGEXP_FLAG_ASSERT_EQ(kMultiline, MULTILINE);
  #undef REGEXP_FLAG_ASSERT_EQ
  
  v8::RegExp::Flags v8::RegExp::GetFlags() const {
    i::Handle<i::JSRegExp> obj = Utils::OpenHandle(this);
    return static_cast<RegExp::Flags>(obj->GetFlags().value());
  }
  
  
  Local<v8::Array> v8::Array::New(Isolate* isolate, int length) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::Array::New()");
    LOG_API(i_isolate, "Array::New");
    ENTER_V8(i_isolate);
    int real_length = length > 0 ? length : 0;
    i::Handle<i::JSArray> obj = i_isolate->factory()->NewJSArray(real_length);
    i::Handle<i::Object> length_obj =
        i_isolate->factory()->NewNumberFromInt(real_length);
    obj->set_length(*length_obj);
    return Utils::ToLocal(obj);
  }
  
  
  uint32_t v8::Array::Length() const {
    i::Handle<i::JSArray> obj = Utils::OpenHandle(this);
    i::Object* length = obj->length();
    if (length->IsSmi()) {
      return i::Smi::cast(length)->value();
    } else {
      return static_cast<uint32_t>(length->Number());
    }
  }
  
  
  Local<Object> Array::CloneElementAt(uint32_t index) {
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ON_BAILOUT(isolate, "v8::Array::CloneElementAt()", return Local<Object>());
    i::Handle<i::JSObject> self = Utils::OpenHandle(this);
    if (!self->HasFastObjectElements()) {
      return Local<Object>();
    }
    i::FixedArray* elms = i::FixedArray::cast(self->elements());
    i::Object* paragon = elms->get(index);
    if (!paragon->IsJSObject()) {
      return Local<Object>();
    }
    i::Handle<i::JSObject> paragon_handle(i::JSObject::cast(paragon));
    EXCEPTION_PREAMBLE(isolate);
    ENTER_V8(isolate);
    i::Handle<i::JSObject> result = i::JSObject::Copy(paragon_handle);
    has_pending_exception = result.is_null();
    EXCEPTION_BAILOUT_CHECK(isolate, Local<Object>());
    return Utils::ToLocal(result);
  }
  
  
  bool Value::IsPromise() const {
    i::Handle<i::Object> val = Utils::OpenHandle(this);
    if (!i::FLAG_harmony_promises || !val->IsJSObject()) return false;
    i::Handle<i::JSObject> obj = i::Handle<i::JSObject>::cast(val);
    i::Isolate* isolate = obj->GetIsolate();
    LOG_API(isolate, "IsPromise");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> argv[] = { obj };
    i::Handle<i::Object> b = i::Execution::Call(
        isolate,
        handle(
            isolate->context()->global_object()->native_context()->is_promise()),
        isolate->factory()->undefined_value(),
        ARRAY_SIZE(argv), argv,
        &has_pending_exception,
        false);
    EXCEPTION_BAILOUT_CHECK(isolate, false);
    return b->BooleanValue();
  }
  
  
  Local<Promise::Resolver> Promise::Resolver::New(Isolate* v8_isolate) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    LOG_API(isolate, "Promise::Resolver::New");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> result = i::Execution::Call(
        isolate,
        handle(isolate->context()->global_object()->native_context()->
               promise_create()),
        isolate->factory()->undefined_value(),
        0, NULL,
        &has_pending_exception,
        false);
    EXCEPTION_BAILOUT_CHECK(isolate, Local<Promise::Resolver>());
    return Local<Promise::Resolver>::Cast(Utils::ToLocal(result));
  }
  
  
  Local<Promise> Promise::Resolver::GetPromise() {
    i::Handle<i::JSObject> promise = Utils::OpenHandle(this);
    return Local<Promise>::Cast(Utils::ToLocal(promise));
  }
  
  
  void Promise::Resolver::Resolve(Handle<Value> value) {
    i::Handle<i::JSObject> promise = Utils::OpenHandle(this);
    i::Isolate* isolate = promise->GetIsolate();
    LOG_API(isolate, "Promise::Resolver::Resolve");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> argv[] = { promise, Utils::OpenHandle(*value) };
    i::Execution::Call(
        isolate,
        handle(isolate->context()->global_object()->native_context()->
               promise_resolve()),
        isolate->factory()->undefined_value(),
        ARRAY_SIZE(argv), argv,
        &has_pending_exception,
        false);
    EXCEPTION_BAILOUT_CHECK(isolate, /* void */ ;);
  }
  
  
  void Promise::Resolver::Reject(Handle<Value> value) {
    i::Handle<i::JSObject> promise = Utils::OpenHandle(this);
    i::Isolate* isolate = promise->GetIsolate();
    LOG_API(isolate, "Promise::Resolver::Reject");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> argv[] = { promise, Utils::OpenHandle(*value) };
    i::Execution::Call(
        isolate,
        handle(isolate->context()->global_object()->native_context()->
               promise_reject()),
        isolate->factory()->undefined_value(),
        ARRAY_SIZE(argv), argv,
        &has_pending_exception,
        false);
    EXCEPTION_BAILOUT_CHECK(isolate, /* void */ ;);
  }
  
  
  Local<Promise> Promise::Chain(Handle<Function> handler) {
    i::Handle<i::JSObject> promise = Utils::OpenHandle(this);
    i::Isolate* isolate = promise->GetIsolate();
    LOG_API(isolate, "Promise::Chain");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*handler) };
    i::Handle<i::Object> result = i::Execution::Call(
        isolate,
        handle(isolate->context()->global_object()->native_context()->
               promise_chain()),
        promise,
        ARRAY_SIZE(argv), argv,
        &has_pending_exception,
        false);
    EXCEPTION_BAILOUT_CHECK(isolate, Local<Promise>());
    return Local<Promise>::Cast(Utils::ToLocal(result));
  }
  
  
  Local<Promise> Promise::Catch(Handle<Function> handler) {
    i::Handle<i::JSObject> promise = Utils::OpenHandle(this);
    i::Isolate* isolate = promise->GetIsolate();
    LOG_API(isolate, "Promise::Catch");
    ENTER_V8(isolate);
    EXCEPTION_PREAMBLE(isolate);
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*handler) };
    i::Handle<i::Object> result = i::Execution::Call(
        isolate,
        handle(isolate->context()->global_object()->native_context()->
               promise_catch()),
        promise,
        ARRAY_SIZE(argv), argv,
        &has_pending_exception,
        false);
    EXCEPTION_BAILOUT_CHECK(isolate, Local<Promise>());
    return Local<Promise>::Cast(Utils::ToLocal(result));
  }
  
  
  bool v8::ArrayBuffer::IsExternal() const {
    return Utils::OpenHandle(this)->is_external();
  }
  
  
  v8::ArrayBuffer::Contents v8::ArrayBuffer::Externalize() {
    i::Handle<i::JSArrayBuffer> obj = Utils::OpenHandle(this);
    Utils::ApiCheck(!obj->is_external(),
                    "v8::ArrayBuffer::Externalize",
                    "ArrayBuffer already externalized");
    obj->set_is_external(true);
    size_t byte_length = static_cast<size_t>(obj->byte_length()->Number());
    Contents contents;
    contents.data_ = obj->backing_store();
    contents.byte_length_ = byte_length;
    return contents;
  }
  
  
  void v8::ArrayBuffer::Neuter() {
    i::Handle<i::JSArrayBuffer> obj = Utils::OpenHandle(this);
    i::Isolate* isolate = obj->GetIsolate();
    Utils::ApiCheck(obj->is_external(),
                    "v8::ArrayBuffer::Neuter",
                    "Only externalized ArrayBuffers can be neutered");
    LOG_API(obj->GetIsolate(), "v8::ArrayBuffer::Neuter()");
    ENTER_V8(isolate);
    i::Runtime::NeuterArrayBuffer(obj);
  }
  
  
  size_t v8::ArrayBuffer::ByteLength() const {
    i::Handle<i::JSArrayBuffer> obj = Utils::OpenHandle(this);
    return static_cast<size_t>(obj->byte_length()->Number());
  }
  
  
  Local<ArrayBuffer> v8::ArrayBuffer::New(Isolate* isolate, size_t byte_length) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::ArrayBuffer::New(size_t)");
    LOG_API(i_isolate, "v8::ArrayBuffer::New(size_t)");
    ENTER_V8(i_isolate);
    i::Handle<i::JSArrayBuffer> obj =
        i_isolate->factory()->NewJSArrayBuffer();
    i::Runtime::SetupArrayBufferAllocatingData(i_isolate, obj, byte_length);
    return Utils::ToLocal(obj);
  }
  
  
  Local<ArrayBuffer> v8::ArrayBuffer::New(Isolate* isolate, void* data,
                                          size_t byte_length) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::ArrayBuffer::New(void*, size_t)");
    LOG_API(i_isolate, "v8::ArrayBuffer::New(void*, size_t)");
    ENTER_V8(i_isolate);
    i::Handle<i::JSArrayBuffer> obj =
        i_isolate->factory()->NewJSArrayBuffer();
    i::Runtime::SetupArrayBuffer(i_isolate, obj, true, data, byte_length);
    return Utils::ToLocal(obj);
  }
  
  
  Local<ArrayBuffer> v8::ArrayBufferView::Buffer() {
    i::Handle<i::JSArrayBufferView> obj = Utils::OpenHandle(this);
    i::Handle<i::JSArrayBuffer> buffer;
    if (obj->IsJSDataView()) {
      i::Handle<i::JSDataView> data_view(i::JSDataView::cast(*obj));
      ASSERT(data_view->buffer()->IsJSArrayBuffer());
      buffer = i::handle(i::JSArrayBuffer::cast(data_view->buffer()));
    } else {
      ASSERT(obj->IsJSTypedArray());
      buffer = i::JSTypedArray::cast(*obj)->GetBuffer();
    }
    return Utils::ToLocal(buffer);
  }
  
  
  size_t v8::ArrayBufferView::ByteOffset() {
    i::Handle<i::JSArrayBufferView> obj = Utils::OpenHandle(this);
    return static_cast<size_t>(obj->byte_offset()->Number());
  }
  
  
  size_t v8::ArrayBufferView::ByteLength() {
    i::Handle<i::JSArrayBufferView> obj = Utils::OpenHandle(this);
    return static_cast<size_t>(obj->byte_length()->Number());
  }
  
  
  size_t v8::TypedArray::Length() {
    i::Handle<i::JSTypedArray> obj = Utils::OpenHandle(this);
    return static_cast<size_t>(obj->length()->Number());
  }
  
  
  static inline void SetupArrayBufferView(
      i::Isolate* isolate,
      i::Handle<i::JSArrayBufferView> obj,
      i::Handle<i::JSArrayBuffer> buffer,
      size_t byte_offset,
      size_t byte_length) {
    ASSERT(byte_offset + byte_length <=
           static_cast<size_t>(buffer->byte_length()->Number()));
  
    obj->set_buffer(*buffer);
  
    obj->set_weak_next(buffer->weak_first_view());
    buffer->set_weak_first_view(*obj);
  
    i::Handle<i::Object> byte_offset_object =
        isolate->factory()->NewNumberFromSize(byte_offset);
    obj->set_byte_offset(*byte_offset_object);
  
    i::Handle<i::Object> byte_length_object =
        isolate->factory()->NewNumberFromSize(byte_length);
    obj->set_byte_length(*byte_length_object);
  }
  
  template<typename ElementType,
           ExternalArrayType array_type,
           i::ElementsKind elements_kind>
  i::Handle<i::JSTypedArray> NewTypedArray(
      i::Isolate* isolate,
      Handle<ArrayBuffer> array_buffer, size_t byte_offset, size_t length) {
    i::Handle<i::JSTypedArray> obj =
        isolate->factory()->NewJSTypedArray(array_type);
    i::Handle<i::JSArrayBuffer> buffer = Utils::OpenHandle(*array_buffer);
  
    ASSERT(byte_offset % sizeof(ElementType) == 0);
  
    CHECK(length <= (std::numeric_limits<size_t>::max() / sizeof(ElementType)));
    size_t byte_length = length * sizeof(ElementType);
    SetupArrayBufferView(
        isolate, obj, buffer, byte_offset, byte_length);
  
    i::Handle<i::Object> length_object =
        isolate->factory()->NewNumberFromSize(length);
    obj->set_length(*length_object);
  
    i::Handle<i::ExternalArray> elements =
        isolate->factory()->NewExternalArray(
            static_cast<int>(length), array_type,
            static_cast<uint8_t*>(buffer->backing_store()) + byte_offset);
    i::Handle<i::Map> map =
        i::JSObject::GetElementsTransitionMap(obj, elements_kind);
    obj->set_map_and_elements(*map, *elements);
    return obj;
  }
  
  
  #define TYPED_ARRAY_NEW(Type, type, TYPE, ctype, size)                       \
    Local<Type##Array> Type##Array::New(Handle<ArrayBuffer> array_buffer,      \
                                      size_t byte_offset, size_t length) {     \
      i::Isolate* isolate = i::Isolate::Current();                             \
      EnsureInitializedForIsolate(isolate,                                     \
          "v8::" #Type "Array::New(Handle<ArrayBuffer>, size_t, size_t)");     \
      LOG_API(isolate,                                                         \
          "v8::" #Type "Array::New(Handle<ArrayBuffer>, size_t, size_t)");     \
      ENTER_V8(isolate);                                                       \
      i::Handle<i::JSTypedArray> obj =                                         \
          NewTypedArray<ctype, v8::kExternal##Type##Array,                     \
                        i::EXTERNAL_##TYPE##_ELEMENTS>(                        \
              isolate, array_buffer, byte_offset, length);                     \
      return Utils::ToLocal##Type##Array(obj);                                 \
    }
  
  
  TYPED_ARRAYS(TYPED_ARRAY_NEW)
  #undef TYPED_ARRAY_NEW
  
  Local<DataView> DataView::New(Handle<ArrayBuffer> array_buffer,
                                size_t byte_offset, size_t byte_length) {
    i::Isolate* isolate = i::Isolate::Current();
    EnsureInitializedForIsolate(
        isolate, "v8::DataView::New(void*, size_t, size_t)");
    LOG_API(isolate, "v8::DataView::New(void*, size_t, size_t)");
    ENTER_V8(isolate);
    i::Handle<i::JSDataView> obj = isolate->factory()->NewJSDataView();
    i::Handle<i::JSArrayBuffer> buffer = Utils::OpenHandle(*array_buffer);
    SetupArrayBufferView(
        isolate, obj, buffer, byte_offset, byte_length);
    return Utils::ToLocal(obj);
  }
  
  
  Local<Symbol> v8::Symbol::New(Isolate* isolate, Local<String> name) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::Symbol::New()");
    LOG_API(i_isolate, "Symbol::New()");
    ENTER_V8(i_isolate);
    i::Handle<i::Symbol> result = i_isolate->factory()->NewSymbol();
    if (!name.IsEmpty()) result->set_name(*Utils::OpenHandle(*name));
    return Utils::ToLocal(result);
  }
  
  
  Local<Symbol> v8::Symbol::For(Isolate* isolate, Local<String> name) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::Handle<i::String> i_name = Utils::OpenHandle(*name);
    i::Handle<i::JSObject> registry = i_isolate->GetSymbolRegistry();
    i::Handle<i::String> part = i_isolate->factory()->for_string();
    i::Handle<i::JSObject> symbols =
        i::Handle<i::JSObject>::cast(i::JSObject::GetProperty(registry, part));
    i::Handle<i::Object> symbol = i::JSObject::GetProperty(symbols, i_name);
    if (!symbol->IsSymbol()) {
      ASSERT(symbol->IsUndefined());
      symbol = i_isolate->factory()->NewSymbol();
      i::Handle<i::Symbol>::cast(symbol)->set_name(*i_name);
      i::JSObject::SetProperty(symbols, i_name, symbol, NONE, i::STRICT);
    }
    return Utils::ToLocal(i::Handle<i::Symbol>::cast(symbol));
  }
  
  
  Local<Symbol> v8::Symbol::ForApi(Isolate* isolate, Local<String> name) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::Handle<i::String> i_name = Utils::OpenHandle(*name);
    i::Handle<i::JSObject> registry = i_isolate->GetSymbolRegistry();
    i::Handle<i::String> part = i_isolate->factory()->for_api_string();
    i::Handle<i::JSObject> symbols =
        i::Handle<i::JSObject>::cast(i::JSObject::GetProperty(registry, part));
    i::Handle<i::Object> symbol = i::JSObject::GetProperty(symbols, i_name);
    if (!symbol->IsSymbol()) {
      ASSERT(symbol->IsUndefined());
      symbol = i_isolate->factory()->NewSymbol();
      i::Handle<i::Symbol>::cast(symbol)->set_name(*i_name);
      i::JSObject::SetProperty(symbols, i_name, symbol, NONE, i::STRICT);
    }
    return Utils::ToLocal(i::Handle<i::Symbol>::cast(symbol));
  }
  
  
  Local<Private> v8::Private::New(Isolate* isolate, Local<String> name) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    EnsureInitializedForIsolate(i_isolate, "v8::Private::New()");
    LOG_API(i_isolate, "Private::New()");
    ENTER_V8(i_isolate);
    i::Handle<i::Symbol> symbol = i_isolate->factory()->NewPrivateSymbol();
    if (!name.IsEmpty()) symbol->set_name(*Utils::OpenHandle(*name));
    Local<Symbol> result = Utils::ToLocal(symbol);
    return v8::Handle<Private>(reinterpret_cast<Private*>(*result));
  }
  
  
  Local<Private> v8::Private::ForApi(Isolate* isolate, Local<String> name) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::Handle<i::String> i_name = Utils::OpenHandle(*name);
    i::Handle<i::JSObject> registry = i_isolate->GetSymbolRegistry();
    i::Handle<i::String> part = i_isolate->factory()->private_api_string();
    i::Handle<i::JSObject> privates =
        i::Handle<i::JSObject>::cast(i::JSObject::GetProperty(registry, part));
    i::Handle<i::Object> symbol = i::JSObject::GetProperty(privates, i_name);
    if (!symbol->IsSymbol()) {
      ASSERT(symbol->IsUndefined());
      symbol = i_isolate->factory()->NewPrivateSymbol();
      i::Handle<i::Symbol>::cast(symbol)->set_name(*i_name);
      i::JSObject::SetProperty(privates, i_name, symbol, NONE, i::STRICT);
    }
    Local<Symbol> result = Utils::ToLocal(i::Handle<i::Symbol>::cast(symbol));
    return v8::Handle<Private>(reinterpret_cast<Private*>(*result));
  }
  
  
  Local<Number> v8::Number::New(Isolate* isolate, double value) {
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ASSERT(internal_isolate->IsInitialized());
    if (std::isnan(value)) {
      // Introduce only canonical NaN value into the VM, to avoid signaling NaNs.
      value = i::OS::nan_value();
    }
    ENTER_V8(internal_isolate);
    i::Handle<i::Object> result = internal_isolate->factory()->NewNumber(value);
    return Utils::NumberToLocal(result);
  }
  
  
  Local<Integer> v8::Integer::New(Isolate* isolate, int32_t value) {
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ASSERT(internal_isolate->IsInitialized());
    if (i::Smi::IsValid(value)) {
      return Utils::IntegerToLocal(i::Handle<i::Object>(i::Smi::FromInt(value),
                                                        internal_isolate));
    }
    ENTER_V8(internal_isolate);
    i::Handle<i::Object> result = internal_isolate->factory()->NewNumber(value);
    return Utils::IntegerToLocal(result);
  }
  
  
  Local<Integer> v8::Integer::NewFromUnsigned(Isolate* isolate, uint32_t value) {
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ASSERT(internal_isolate->IsInitialized());
    bool fits_into_int32_t = (value & (1 << 31)) == 0;
    if (fits_into_int32_t) {
      return Integer::New(isolate, static_cast<int32_t>(value));
    }
    ENTER_V8(internal_isolate);
    i::Handle<i::Object> result = internal_isolate->factory()->NewNumber(value);
    return Utils::IntegerToLocal(result);
  }
  
  
  bool V8::AddMessageListener(MessageCallback that, Handle<Value> data) {
    i::Isolate* isolate = i::Isolate::Current();
    EnsureInitializedForIsolate(isolate, "v8::V8::AddMessageListener()");
    ON_BAILOUT(isolate, "v8::V8::AddMessageListener()", return false);
    ENTER_V8(isolate);
    i::HandleScope scope(isolate);
    NeanderArray listeners(isolate->factory()->message_listeners());
    NeanderObject obj(isolate, 2);
    obj.set(0, *isolate->factory()->NewForeign(FUNCTION_ADDR(that)));
    obj.set(1, data.IsEmpty() ? isolate->heap()->undefined_value()
            : *Utils::OpenHandle(*data));
    listeners.add(obj.value());
    return true;
  }
  
  
  void V8::RemoveMessageListeners(MessageCallback that) {
    i::Isolate* isolate = i::Isolate::Current();
    EnsureInitializedForIsolate(isolate, "v8::V8::RemoveMessageListener()");
    ON_BAILOUT(isolate, "v8::V8::RemoveMessageListeners()", return);
    ENTER_V8(isolate);
    i::HandleScope scope(isolate);
    NeanderArray listeners(isolate->factory()->message_listeners());
    for (int i = 0; i < listeners.length(); i++) {
      if (listeners.get(i)->IsUndefined()) continue;  // skip deleted ones
  
      NeanderObject listener(i::JSObject::cast(listeners.get(i)));
      i::Handle<i::Foreign> callback_obj(i::Foreign::cast(listener.get(0)));
      if (callback_obj->foreign_address() == FUNCTION_ADDR(that)) {
        listeners.set(i, isolate->heap()->undefined_value());
      }
    }
  }
  
  
  void V8::SetCaptureStackTraceForUncaughtExceptions(
      bool capture,
      int frame_limit,
      StackTrace::StackTraceOptions options) {
    i::Isolate::Current()->SetCaptureStackTraceForUncaughtExceptions(
        capture,
        frame_limit,
        options);
  }
  
  
  void V8::SetCounterFunction(CounterLookupCallback callback) {
    i::Isolate* isolate = EnterIsolateIfNeeded();
    isolate->stats_table()->SetCounterFunction(callback);
  }
  
  
  void V8::SetCreateHistogramFunction(CreateHistogramCallback callback) {
    i::Isolate* isolate = EnterIsolateIfNeeded();
    isolate->stats_table()->SetCreateHistogramFunction(callback);
    isolate->InitializeLoggingAndCounters();
    isolate->counters()->ResetHistograms();
  }
  
  
  void V8::SetAddHistogramSampleFunction(AddHistogramSampleCallback callback) {
    i::Isolate* isolate = EnterIsolateIfNeeded();
    isolate->stats_table()->
        SetAddHistogramSampleFunction(callback);
  }
  
  void V8::SetFailedAccessCheckCallbackFunction(
      FailedAccessCheckCallback callback) {
    i::Isolate* isolate = i::Isolate::Current();
    isolate->SetFailedAccessCheckCallback(callback);
  }
  
  
  int64_t Isolate::AdjustAmountOfExternalAllocatedMemory(
      int64_t change_in_bytes) {
    i::Heap* heap = reinterpret_cast<i::Isolate*>(this)->heap();
    return heap->AdjustAmountOfExternalAllocatedMemory(change_in_bytes);
  }
  
  
  HeapProfiler* Isolate::GetHeapProfiler() {
    i::HeapProfiler* heap_profiler =
        reinterpret_cast<i::Isolate*>(this)->heap_profiler();
    return reinterpret_cast<HeapProfiler*>(heap_profiler);
  }
  
  
  CpuProfiler* Isolate::GetCpuProfiler() {
    i::CpuProfiler* cpu_profiler =
        reinterpret_cast<i::Isolate*>(this)->cpu_profiler();
    return reinterpret_cast<CpuProfiler*>(cpu_profiler);
  }
  
  
  bool Isolate::InContext() {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    return isolate->context() != NULL;
  }
  
  
  v8::Local<v8::Context> Isolate::GetCurrentContext() {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Context* context = isolate->context();
    if (context == NULL) return Local<Context>();
    i::Context* native_context = context->global_object()->native_context();
    if (native_context == NULL) return Local<Context>();
    return Utils::ToLocal(i::Handle<i::Context>(native_context));
  }
  
  
  v8::Local<v8::Context> Isolate::GetCallingContext() {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Handle<i::Object> calling = isolate->GetCallingNativeContext();
    if (calling.is_null()) return Local<Context>();
    return Utils::ToLocal(i::Handle<i::Context>::cast(calling));
  }
  
  
  v8::Local<v8::Context> Isolate::GetEnteredContext() {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Handle<i::Object> last =
        isolate->handle_scope_implementer()->LastEnteredContext();
    if (last.is_null()) return Local<Context>();
    return Utils::ToLocal(i::Handle<i::Context>::cast(last));
  }
  
  
  v8::Local<Value> Isolate::ThrowException(v8::Local<v8::Value> value) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    ENTER_V8(isolate);
    // If we're passed an empty handle, we throw an undefined exception
    // to deal more gracefully with out of memory situations.
    if (value.IsEmpty()) {
      isolate->ScheduleThrow(isolate->heap()->undefined_value());
    } else {
      isolate->ScheduleThrow(*Utils::OpenHandle(*value));
    }
    return v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
  }
  
  
  void Isolate::SetObjectGroupId(internal::Object** object, UniqueId id) {
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(this);
    internal_isolate->global_handles()->SetObjectGroupId(
        v8::internal::Handle<v8::internal::Object>(object).location(),
        id);
  }
  
  
  void Isolate::SetReferenceFromGroup(UniqueId id, internal::Object** object) {
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(this);
    internal_isolate->global_handles()->SetReferenceFromGroup(
        id,
        v8::internal::Handle<v8::internal::Object>(object).location());
  }
  
  
  void Isolate::SetReference(internal::Object** parent,
                             internal::Object** child) {
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(this);
    i::Object** parent_location =
        v8::internal::Handle<v8::internal::Object>(parent).location();
    internal_isolate->global_handles()->SetReference(
        reinterpret_cast<i::HeapObject**>(parent_location),
        v8::internal::Handle<v8::internal::Object>(child).location());
  }
  
  
  void Isolate::AddGCPrologueCallback(GCPrologueCallback callback,
                                      GCType gc_type) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->AddGCPrologueCallback(callback, gc_type);
  }
  
  
  void Isolate::RemoveGCPrologueCallback(GCPrologueCallback callback) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->RemoveGCPrologueCallback(callback);
  }
  
  
  void Isolate::AddGCEpilogueCallback(GCEpilogueCallback callback,
                                      GCType gc_type) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->AddGCEpilogueCallback(callback, gc_type);
  }
  
  
  void Isolate::RemoveGCEpilogueCallback(GCEpilogueCallback callback) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->RemoveGCEpilogueCallback(callback);
  }
  
  
  void V8::AddGCPrologueCallback(GCPrologueCallback callback, GCType gc_type) {
    i::Isolate* isolate = i::Isolate::Current();
    isolate->heap()->AddGCPrologueCallback(
        reinterpret_cast<v8::Isolate::GCPrologueCallback>(callback),
        gc_type,
        false);
  }
  
  
  void V8::RemoveGCPrologueCallback(GCPrologueCallback callback) {
    i::Isolate* isolate = i::Isolate::Current();
    isolate->heap()->RemoveGCPrologueCallback(
        reinterpret_cast<v8::Isolate::GCPrologueCallback>(callback));
  }
  
  
  void V8::AddGCEpilogueCallback(GCEpilogueCallback callback, GCType gc_type) {
    i::Isolate* isolate = i::Isolate::Current();
    isolate->heap()->AddGCEpilogueCallback(
        reinterpret_cast<v8::Isolate::GCEpilogueCallback>(callback),
        gc_type,
        false);
  }
  
  
  void V8::RemoveGCEpilogueCallback(GCEpilogueCallback callback) {
    i::Isolate* isolate = i::Isolate::Current();
    isolate->heap()->RemoveGCEpilogueCallback(
        reinterpret_cast<v8::Isolate::GCEpilogueCallback>(callback));
  }
  
  
  void V8::AddMemoryAllocationCallback(MemoryAllocationCallback callback,
                                       ObjectSpace space,
                                       AllocationAction action) {
    i::Isolate* isolate = i::Isolate::Current();
    isolate->memory_allocator()->AddMemoryAllocationCallback(
        callback, space, action);
  }
  
  
  void V8::RemoveMemoryAllocationCallback(MemoryAllocationCallback callback) {
    i::Isolate* isolate = i::Isolate::Current();
    isolate->memory_allocator()->RemoveMemoryAllocationCallback(
        callback);
  }
  
  
  void V8::AddCallCompletedCallback(CallCompletedCallback callback) {
    if (callback == NULL) return;
    i::V8::AddCallCompletedCallback(callback);
  }
  
  
  void V8::RunMicrotasks(Isolate* isolate) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::HandleScope scope(i_isolate);
    i::V8::RunMicrotasks(i_isolate);
  }
  
  
  void V8::EnqueueMicrotask(Isolate* isolate, Handle<Function> microtask) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ENTER_V8(i_isolate);
    i::Execution::EnqueueMicrotask(i_isolate, Utils::OpenHandle(*microtask));
  }
  
  
  void V8::SetAutorunMicrotasks(Isolate* isolate, bool autorun) {
    reinterpret_cast<i::Isolate*>(isolate)->set_autorun_microtasks(autorun);
  }
  
  
  void V8::RemoveCallCompletedCallback(CallCompletedCallback callback) {
    i::V8::RemoveCallCompletedCallback(callback);
  }
  
  
  void V8::TerminateExecution(Isolate* isolate) {
    // If no isolate is supplied, use the default isolate.
    if (isolate != NULL) {
      reinterpret_cast<i::Isolate*>(isolate)->stack_guard()->TerminateExecution();
    } else {
      i::Isolate::GetDefaultIsolateStackGuard()->TerminateExecution();
    }
  }
  
  
  bool V8::IsExecutionTerminating(Isolate* isolate) {
    i::Isolate* i_isolate = isolate != NULL ?
        reinterpret_cast<i::Isolate*>(isolate) : i::Isolate::Current();
    return IsExecutionTerminatingCheck(i_isolate);
  }
  
  
  void V8::CancelTerminateExecution(Isolate* isolate) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i_isolate->stack_guard()->CancelTerminateExecution();
  }
  
  
  void Isolate::RequestInterrupt(InterruptCallback callback, void* data) {
    reinterpret_cast<i::Isolate*>(this)->stack_guard()->RequestInterrupt(
        callback, data);
  }
  
  
  void Isolate::ClearInterrupt() {
    reinterpret_cast<i::Isolate*>(this)->stack_guard()->ClearInterrupt();
  }
  
  
  void Isolate::RequestGarbageCollectionForTesting(GarbageCollectionType type) {
    CHECK(i::FLAG_expose_gc);
    if (type == kMinorGarbageCollection) {
      reinterpret_cast<i::Isolate*>(this)->heap()->CollectGarbage(
          i::NEW_SPACE, "Isolate::RequestGarbageCollection",
          kGCCallbackFlagForced);
    } else {
      ASSERT_EQ(kFullGarbageCollection, type);
      reinterpret_cast<i::Isolate*>(this)->heap()->CollectAllGarbage(
          i::Heap::kAbortIncrementalMarkingMask,
          "Isolate::RequestGarbageCollection", kGCCallbackFlagForced);
    }
  }
  
  
  Isolate* Isolate::GetCurrent() {
    i::Isolate* isolate = i::Isolate::UncheckedCurrent();
    return reinterpret_cast<Isolate*>(isolate);
  }
  
  
  Isolate* Isolate::New() {
    i::Isolate* isolate = new i::Isolate();
    return reinterpret_cast<Isolate*>(isolate);
  }
  
  
  void Isolate::Dispose() {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    if (!Utils::ApiCheck(!isolate->IsInUse(),
                         "v8::Isolate::Dispose()",
                         "Disposing the isolate that is entered by a thread.")) {
      return;
    }
    isolate->TearDown();
  }
  
  
  void Isolate::Enter() {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->Enter();
  }
  
  
  void Isolate::Exit() {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->Exit();
  }
  
  
  Isolate::DisallowJavascriptExecutionScope::DisallowJavascriptExecutionScope(
      Isolate* isolate,
      Isolate::DisallowJavascriptExecutionScope::OnFailure on_failure)
      : on_failure_(on_failure) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    if (on_failure_ == CRASH_ON_FAILURE) {
      internal_ = reinterpret_cast<void*>(
          new i::DisallowJavascriptExecution(i_isolate));
    } else {
      ASSERT_EQ(THROW_ON_FAILURE, on_failure);
      internal_ = reinterpret_cast<void*>(
          new i::ThrowOnJavascriptExecution(i_isolate));
    }
  }
  
  
  Isolate::DisallowJavascriptExecutionScope::~DisallowJavascriptExecutionScope() {
    if (on_failure_ == CRASH_ON_FAILURE) {
      delete reinterpret_cast<i::DisallowJavascriptExecution*>(internal_);
    } else {
      delete reinterpret_cast<i::ThrowOnJavascriptExecution*>(internal_);
    }
  }
  
  
  Isolate::AllowJavascriptExecutionScope::AllowJavascriptExecutionScope(
      Isolate* isolate) {
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    internal_assert_ = reinterpret_cast<void*>(
        new i::AllowJavascriptExecution(i_isolate));
    internal_throws_ = reinterpret_cast<void*>(
        new i::NoThrowOnJavascriptExecution(i_isolate));
  }
  
  
  Isolate::AllowJavascriptExecutionScope::~AllowJavascriptExecutionScope() {
    delete reinterpret_cast<i::AllowJavascriptExecution*>(internal_assert_);
    delete reinterpret_cast<i::NoThrowOnJavascriptExecution*>(internal_throws_);
  }
  
  
  void Isolate::GetHeapStatistics(HeapStatistics* heap_statistics) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    if (!isolate->IsInitialized()) {
      heap_statistics->total_heap_size_ = 0;
      heap_statistics->total_heap_size_executable_ = 0;
      heap_statistics->total_physical_size_ = 0;
      heap_statistics->used_heap_size_ = 0;
      heap_statistics->heap_size_limit_ = 0;
      return;
    }
    i::Heap* heap = isolate->heap();
    heap_statistics->total_heap_size_ = heap->CommittedMemory();
    heap_statistics->total_heap_size_executable_ =
        heap->CommittedMemoryExecutable();
    heap_statistics->total_physical_size_ = heap->CommittedPhysicalMemory();
    heap_statistics->used_heap_size_ = heap->SizeOfObjects();
    heap_statistics->heap_size_limit_ = heap->MaxReserved();
  }
  
  
  void Isolate::SetEventLogger(LogEventCallback that) {
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->set_event_logger(that);
  }
  
  String::Utf8Value::Utf8Value(v8::Handle<v8::Value> obj)
      : str_(NULL), length_(0) {
    i::Isolate* isolate = i::Isolate::Current();
    if (obj.IsEmpty()) return;
    ENTER_V8(isolate);
    i::HandleScope scope(isolate);
    TryCatch try_catch;
    Handle<String> str = obj->ToString();
    if (str.IsEmpty()) return;
    i::Handle<i::String> i_str = Utils::OpenHandle(*str);
    length_ = v8::Utf8Length(*i_str, isolate);
    str_ = i::NewArray<char>(length_ + 1);
    str->WriteUtf8(str_);
  }
  
  
  String::Utf8Value::~Utf8Value() {
    i::DeleteArray(str_);
  }
  
  
  String::Value::Value(v8::Handle<v8::Value> obj)
      : str_(NULL), length_(0) {
    i::Isolate* isolate = i::Isolate::Current();
    if (obj.IsEmpty()) return;
    ENTER_V8(isolate);
    i::HandleScope scope(isolate);
    TryCatch try_catch;
    Handle<String> str = obj->ToString();
    if (str.IsEmpty()) return;
    length_ = str->Length();
    str_ = i::NewArray<uint16_t>(length_ + 1);
    str->Write(str_);
  }
  
  
  String::Value::~Value() {
    i::DeleteArray(str_);
  }
  
  
  Local<Value> Exception::RangeError(v8::Handle<v8::String> raw_message) {
    i::Isolate* isolate = i::Isolate::Current();
    LOG_API(isolate, "RangeError");
    ON_BAILOUT(isolate, "v8::Exception::RangeError()", return Local<Value>());
    ENTER_V8(isolate);
    i::Object* error;
    {
      i::HandleScope scope(isolate);
      i::Handle<i::String> message = Utils::OpenHandle(*raw_message);
      i::Handle<i::Object> result = isolate->factory()->NewRangeError(message);
      error = *result;
    }
    i::Handle<i::Object> result(error, isolate);
    return Utils::ToLocal(result);
  }
  
  
  Local<Value> Exception::ReferenceError(v8::Handle<v8::String> raw_message) {
    i::Isolate* isolate = i::Isolate::Current();
    LOG_API(isolate, "ReferenceError");
    ON_BAILOUT(isolate, "v8::Exception::ReferenceError()", return Local<Value>());
    ENTER_V8(isolate);
    i::Object* error;
    {
      i::HandleScope scope(isolate);
      i::Handle<i::String> message = Utils::OpenHandle(*raw_message);
      i::Handle<i::Object> result =
          isolate->factory()->NewReferenceError(message);
      error = *result;
    }
    i::Handle<i::Object> result(error, isolate);
    return Utils::ToLocal(result);
  }
  
  
  Local<Value> Exception::SyntaxError(v8::Handle<v8::String> raw_message) {
    i::Isolate* isolate = i::Isolate::Current();
    LOG_API(isolate, "SyntaxError");
    ON_BAILOUT(isolate, "v8::Exception::SyntaxError()", return Local<Value>());
    ENTER_V8(isolate);
    i::Object* error;
    {
      i::HandleScope scope(isolate);
      i::Handle<i::String> message = Utils::OpenHandle(*raw_message);
      i::Handle<i::Object> result = isolate->factory()->NewSyntaxError(message);
      error = *result;
    }
    i::Handle<i::Object> result(error, isolate);
    return Utils::ToLocal(result);
  }
  
  
  Local<Value> Exception::TypeError(v8::Handle<v8::String> raw_message) {
    i::Isolate* isolate = i::Isolate::Current();
    LOG_API(isolate, "TypeError");
    ON_BAILOUT(isolate, "v8::Exception::TypeError()", return Local<Value>());
    ENTER_V8(isolate);
    i::Object* error;
    {
      i::HandleScope scope(isolate);
      i::Handle<i::String> message = Utils::OpenHandle(*raw_message);
      i::Handle<i::Object> result = isolate->factory()->NewTypeError(message);
      error = *result;
    }
    i::Handle<i::Object> result(error, isolate);
    return Utils::ToLocal(result);
  }
  
  
  Local<Value> Exception::Error(v8::Handle<v8::String> raw_message) {
    i::Isolate* isolate = i::Isolate::Current();
    LOG_API(isolate, "Error");
    ON_BAILOUT(isolate, "v8::Exception::Error()", return Local<Value>());
    ENTER_V8(isolate);
    i::Object* error;
    {
      i::HandleScope scope(isolate);
      i::Handle<i::String> message = Utils::OpenHandle(*raw_message);
      i::Handle<i::Object> result = isolate->factory()->NewError(message);
      error = *result;
    }
    i::Handle<i::Object> result(error, isolate);
    return Utils::ToLocal(result);
  }
  
  
  // --- D e b u g   S u p p o r t ---
  
  #ifdef ENABLE_DEBUGGER_SUPPORT
  
  bool Debug::SetDebugEventListener2(EventCallback2 that, Handle<Value> data) {
    i::Isolate* isolate = i::Isolate::Current();
    EnsureInitializedForIsolate(isolate, "v8::Debug::SetDebugEventListener2()");
    ON_BAILOUT(isolate, "v8::Debug::SetDebugEventListener2()", return false);
    ENTER_V8(isolate);
    i::HandleScope scope(isolate);
    i::Handle<i::Object> foreign = isolate->factory()->undefined_value();
    if (that != NULL) {
      foreign = isolate->factory()->NewForeign(FUNCTION_ADDR(that));
    }
    isolate->debugger()->SetEventListener(foreign,
                                          Utils::OpenHandle(*data, true));
    return true;
  }
  
  
  bool Debug::SetDebugEventListener(v8::Handle<v8::Object> that,
                                    Handle<Value> data) {
    i::Isolate* isolate = i::Isolate::Current();
    ON_BAILOUT(isolate, "v8::Debug::SetDebugEventListener()", return false);
    ENTER_V8(isolate);
    isolate->debugger()->SetEventListener(Utils::OpenHandle(*that),
                                          Utils::OpenHandle(*data, true));
    return true;
  }
  
  
  void Debug::DebugBreak(Isolate* isolate) {
    // If no isolate is supplied, use the default isolate.
    if (isolate != NULL) {
      reinterpret_cast<i::Isolate*>(isolate)->stack_guard()->DebugBreak();
    } else {
      i::Isolate::GetDefaultIsolateStackGuard()->DebugBreak();
    }
  }
  
  
  void Debug::CancelDebugBreak(Isolate* isolate) {
    // If no isolate is supplied, use the default isolate.
    if (isolate != NULL) {
      i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
      internal_isolate->stack_guard()->Continue(i::DEBUGBREAK);
    } else {
      i::Isolate::GetDefaultIsolateStackGuard()->Continue(i::DEBUGBREAK);
    }
  }
  
  
  void Debug::DebugBreakForCommand(ClientData* data, Isolate* isolate) {
    // If no isolate is supplied, use the default isolate.
    if (isolate != NULL) {
      i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
      internal_isolate->debugger()->EnqueueDebugCommand(data);
    } else {
      i::Isolate::GetDefaultIsolateDebugger()->EnqueueDebugCommand(data);
    }
  }
  
  
  void Debug::SetMessageHandler2(v8::Debug::MessageHandler2 handler) {
    i::Isolate* isolate = i::Isolate::Current();
    EnsureInitializedForIsolate(isolate, "v8::Debug::SetMessageHandler");
    ENTER_V8(isolate);
    isolate->debugger()->SetMessageHandler(handler);
  }
  
  
  void Debug::SendCommand(Isolate* isolate,
                          const uint16_t* command,
                          int length,
                          ClientData* client_data) {
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    internal_isolate->debugger()->ProcessCommand(
        i::Vector<const uint16_t>(command, length), client_data);
  }
  
  
  void Debug::SendCommand(const uint16_t* command, int length,
                          ClientData* client_data,
                          Isolate* isolate) {
    // If no isolate is supplied, use the default isolate.
    if (isolate != NULL) {
      i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
      internal_isolate->debugger()->ProcessCommand(
          i::Vector<const uint16_t>(command, length), client_data);
    } else {
      i::Isolate::GetDefaultIsolateDebugger()->ProcessCommand(
          i::Vector<const uint16_t>(command, length), client_data);
    }
  }
  
  
  void Debug::SetHostDispatchHandler(HostDispatchHandler handler,
                                     int period) {
    i::Isolate* isolate = i::Isolate::Current();
    EnsureInitializedForIsolate(isolate, "v8::Debug::SetHostDispatchHandler");
    ENTER_V8(isolate);
    isolate->debugger()->SetHostDispatchHandler(
        handler, i::TimeDelta::FromMilliseconds(period));
  }
  
  
  void Debug::SetDebugMessageDispatchHandler(
      DebugMessageDispatchHandler handler, bool provide_locker) {
    i::Isolate* isolate = i::Isolate::Current();
    EnsureInitializedForIsolate(isolate,
                                "v8::Debug::SetDebugMessageDispatchHandler");
    ENTER_V8(isolate);
    isolate->debugger()->SetDebugMessageDispatchHandler(
        handler, provide_locker);
  }
  
  
  Local<Value> Debug::Call(v8::Handle<v8::Function> fun,
                           v8::Handle<v8::Value> data) {
    i::Isolate* isolate = i::Isolate::Current();
    if (!isolate->IsInitialized()) return Local<Value>();
    ON_BAILOUT(isolate, "v8::Debug::Call()", return Local<Value>());
    ENTER_V8(isolate);
    i::Handle<i::Object> result;
    EXCEPTION_PREAMBLE(isolate);
    if (data.IsEmpty()) {
      result = isolate->debugger()->Call(Utils::OpenHandle(*fun),
                                         isolate->factory()->undefined_value(),
                                         &has_pending_exception);
    } else {
      result = isolate->debugger()->Call(Utils::OpenHandle(*fun),
                                         Utils::OpenHandle(*data),
                                         &has_pending_exception);
    }
    EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
    return Utils::ToLocal(result);
  }
  
  
  Local<Value> Debug::GetMirror(v8::Handle<v8::Value> obj) {
    i::Isolate* isolate = i::Isolate::Current();
    if (!isolate->IsInitialized()) return Local<Value>();
    ON_BAILOUT(isolate, "v8::Debug::GetMirror()", return Local<Value>());
    ENTER_V8(isolate);
    v8::EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
    i::Debug* isolate_debug = isolate->debug();
    isolate_debug->Load();
    i::Handle<i::JSObject> debug(isolate_debug->debug_context()->global_object());
    i::Handle<i::String> name = isolate->factory()->InternalizeOneByteString(
        STATIC_ASCII_VECTOR("MakeMirror"));
    i::Handle<i::Object> fun_obj = i::GetProperty(isolate, debug, name);
    i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>::cast(fun_obj);
    v8::Handle<v8::Function> v8_fun = Utils::ToLocal(fun);
    const int kArgc = 1;
    v8::Handle<v8::Value> argv[kArgc] = { obj };
    EXCEPTION_PREAMBLE(isolate);
    v8::Local<v8::Value> result =
        v8_fun->Call(Utils::ToLocal(debug), kArgc, argv);
    EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
    return scope.Escape(result);
  }
  
  
  bool Debug::EnableAgent(const char* name, int port, bool wait_for_connection) {
    return i::Isolate::Current()->debugger()->StartAgent(name, port,
                                                         wait_for_connection);
  }
  
  
  void Debug::DisableAgent() {
    return i::Isolate::Current()->debugger()->StopAgent();
  }
  
  
  void Debug::ProcessDebugMessages() {
    i::Execution::ProcessDebugMessages(i::Isolate::Current(), true);
  }
  
  
  Local<Context> Debug::GetDebugContext() {
    i::Isolate* isolate = i::Isolate::Current();
    EnsureInitializedForIsolate(isolate, "v8::Debug::GetDebugContext()");
    ENTER_V8(isolate);
    return Utils::ToLocal(i::Isolate::Current()->debugger()->GetDebugContext());
  }
  
  
  void Debug::SetLiveEditEnabled(bool enable, Isolate* isolate) {
    // If no isolate is supplied, use the default isolate.
    i::Debugger* debugger;
    if (isolate != NULL) {
      i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
      debugger = internal_isolate->debugger();
    } else {
      debugger = i::Isolate::GetDefaultIsolateDebugger();
    }
    debugger->set_live_edit_enabled(enable);
  }
  
  
  #endif  // ENABLE_DEBUGGER_SUPPORT
  
  
  Handle<String> CpuProfileNode::GetFunctionName() const {
    i::Isolate* isolate = i::Isolate::Current();
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    const i::CodeEntry* entry = node->entry();
    if (!entry->has_name_prefix()) {
      return ToApiHandle<String>(
          isolate->factory()->InternalizeUtf8String(entry->name()));
    } else {
      i::Handle<i::String> cons = isolate->factory()->NewConsString(
          isolate->factory()->InternalizeUtf8String(entry->name_prefix()),
          isolate->factory()->InternalizeUtf8String(entry->name()));
      // We do not expect this to fail. Change this if it does.
      CHECK(!cons.is_null());
      return ToApiHandle<String>(cons);
    }
  }
  
  
  int CpuProfileNode::GetScriptId() const {
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    const i::CodeEntry* entry = node->entry();
    return entry->script_id();
  }
  
  
  Handle<String> CpuProfileNode::GetScriptResourceName() const {
    i::Isolate* isolate = i::Isolate::Current();
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    return ToApiHandle<String>(isolate->factory()->InternalizeUtf8String(
        node->entry()->resource_name()));
  }
  
  
  int CpuProfileNode::GetLineNumber() const {
    return reinterpret_cast<const i::ProfileNode*>(this)->entry()->line_number();
  }
  
  
  int CpuProfileNode::GetColumnNumber() const {
    return reinterpret_cast<const i::ProfileNode*>(this)->
        entry()->column_number();
  }
  
  
  const char* CpuProfileNode::GetBailoutReason() const {
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    return node->entry()->bailout_reason();
  }
  
  
  unsigned CpuProfileNode::GetHitCount() const {
    return reinterpret_cast<const i::ProfileNode*>(this)->self_ticks();
  }
  
  
  unsigned CpuProfileNode::GetCallUid() const {
    return reinterpret_cast<const i::ProfileNode*>(this)->entry()->GetCallUid();
  }
  
  
  unsigned CpuProfileNode::GetNodeId() const {
    return reinterpret_cast<const i::ProfileNode*>(this)->id();
  }
  
  
  int CpuProfileNode::GetChildrenCount() const {
    return reinterpret_cast<const i::ProfileNode*>(this)->children()->length();
  }
  
  
  const CpuProfileNode* CpuProfileNode::GetChild(int index) const {
    const i::ProfileNode* child =
        reinterpret_cast<const i::ProfileNode*>(this)->children()->at(index);
    return reinterpret_cast<const CpuProfileNode*>(child);
  }
  
  
  void CpuProfile::Delete() {
    i::Isolate* isolate = i::Isolate::Current();
    i::CpuProfiler* profiler = isolate->cpu_profiler();
    ASSERT(profiler != NULL);
    profiler->DeleteProfile(reinterpret_cast<i::CpuProfile*>(this));
  }
  
  
  Handle<String> CpuProfile::GetTitle() const {
    i::Isolate* isolate = i::Isolate::Current();
    const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
    return ToApiHandle<String>(isolate->factory()->InternalizeUtf8String(
        profile->title()));
  }
  
  
  const CpuProfileNode* CpuProfile::GetTopDownRoot() const {
    const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
    return reinterpret_cast<const CpuProfileNode*>(profile->top_down()->root());
  }
  
  
  const CpuProfileNode* CpuProfile::GetSample(int index) const {
    const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
    return reinterpret_cast<const CpuProfileNode*>(profile->sample(index));
  }
  
  
  int64_t CpuProfile::GetStartTime() const {
    const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
    return (profile->start_time() - i::Time::UnixEpoch()).InMicroseconds();
  }
  
  
  int64_t CpuProfile::GetEndTime() const {
    const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
    return (profile->end_time() - i::Time::UnixEpoch()).InMicroseconds();
  }
  
  
  int CpuProfile::GetSamplesCount() const {
    return reinterpret_cast<const i::CpuProfile*>(this)->samples_count();
  }
  
  
  void CpuProfiler::SetSamplingInterval(int us) {
    ASSERT(us >= 0);
    return reinterpret_cast<i::CpuProfiler*>(this)->set_sampling_interval(
        i::TimeDelta::FromMicroseconds(us));
  }
  
  
  void CpuProfiler::StartProfiling(Handle<String> title, bool record_samples) {
    reinterpret_cast<i::CpuProfiler*>(this)->StartProfiling(
        *Utils::OpenHandle(*title), record_samples);
  }
  
  
  void CpuProfiler::StartCpuProfiling(Handle<String> title, bool record_samples) {
    StartProfiling(title, record_samples);
  }
  
  
  CpuProfile* CpuProfiler::StopProfiling(Handle<String> title) {
    return reinterpret_cast<CpuProfile*>(
        reinterpret_cast<i::CpuProfiler*>(this)->StopProfiling(
            *Utils::OpenHandle(*title)));
  }
  
  
  const CpuProfile* CpuProfiler::StopCpuProfiling(Handle<String> title) {
    return StopProfiling(title);
  }
  
  
  void CpuProfiler::SetIdle(bool is_idle) {
    i::Isolate* isolate = reinterpret_cast<i::CpuProfiler*>(this)->isolate();
    i::StateTag state = isolate->current_vm_state();
    ASSERT(state == i::EXTERNAL || state == i::IDLE);
    if (isolate->js_entry_sp() != NULL) return;
    if (is_idle) {
      isolate->set_current_vm_state(i::IDLE);
    } else if (state == i::IDLE) {
      isolate->set_current_vm_state(i::EXTERNAL);
    }
  }
  
  
  static i::HeapGraphEdge* ToInternal(const HeapGraphEdge* edge) {
    return const_cast<i::HeapGraphEdge*>(
        reinterpret_cast<const i::HeapGraphEdge*>(edge));
  }
  
  
  HeapGraphEdge::Type HeapGraphEdge::GetType() const {
    return static_cast<HeapGraphEdge::Type>(ToInternal(this)->type());
  }
  
  
  Handle<Value> HeapGraphEdge::GetName() const {
    i::Isolate* isolate = i::Isolate::Current();
    i::HeapGraphEdge* edge = ToInternal(this);
    switch (edge->type()) {
      case i::HeapGraphEdge::kContextVariable:
      case i::HeapGraphEdge::kInternal:
      case i::HeapGraphEdge::kProperty:
      case i::HeapGraphEdge::kShortcut:
      case i::HeapGraphEdge::kWeak:
        return ToApiHandle<String>(
            isolate->factory()->InternalizeUtf8String(edge->name()));
      case i::HeapGraphEdge::kElement:
      case i::HeapGraphEdge::kHidden:
        return ToApiHandle<Number>(
            isolate->factory()->NewNumberFromInt(edge->index()));
      default: UNREACHABLE();
    }
    return v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
  }
  
  
  const HeapGraphNode* HeapGraphEdge::GetFromNode() const {
    const i::HeapEntry* from = ToInternal(this)->from();
    return reinterpret_cast<const HeapGraphNode*>(from);
  }
  
  
  const HeapGraphNode* HeapGraphEdge::GetToNode() const {
    const i::HeapEntry* to = ToInternal(this)->to();
    return reinterpret_cast<const HeapGraphNode*>(to);
  }
  
  
  static i::HeapEntry* ToInternal(const HeapGraphNode* entry) {
    return const_cast<i::HeapEntry*>(
        reinterpret_cast<const i::HeapEntry*>(entry));
  }
  
  
  HeapGraphNode::Type HeapGraphNode::GetType() const {
    return static_cast<HeapGraphNode::Type>(ToInternal(this)->type());
  }
  
  
  Handle<String> HeapGraphNode::GetName() const {
    i::Isolate* isolate = i::Isolate::Current();
    return ToApiHandle<String>(
        isolate->factory()->InternalizeUtf8String(ToInternal(this)->name()));
  }
  
  
  SnapshotObjectId HeapGraphNode::GetId() const {
    return ToInternal(this)->id();
  }
  
  
  int HeapGraphNode::GetSelfSize() const {
    size_t size = ToInternal(this)->self_size();
    CHECK(size <= static_cast<size_t>(internal::kMaxInt));
    return static_cast<int>(size);
  }
  
  
  size_t HeapGraphNode::GetShallowSize() const {
    return ToInternal(this)->self_size();
  }
  
  
  int HeapGraphNode::GetChildrenCount() const {
    return ToInternal(this)->children().length();
  }
  
  
  const HeapGraphEdge* HeapGraphNode::GetChild(int index) const {
    return reinterpret_cast<const HeapGraphEdge*>(
        ToInternal(this)->children()[index]);
  }
  
  
  static i::HeapSnapshot* ToInternal(const HeapSnapshot* snapshot) {
    return const_cast<i::HeapSnapshot*>(
        reinterpret_cast<const i::HeapSnapshot*>(snapshot));
  }
  
  
  void HeapSnapshot::Delete() {
    i::Isolate* isolate = i::Isolate::Current();
    if (isolate->heap_profiler()->GetSnapshotsCount() > 1) {
      ToInternal(this)->Delete();
    } else {
      // If this is the last snapshot, clean up all accessory data as well.
      isolate->heap_profiler()->DeleteAllSnapshots();
    }
  }
  
  
  unsigned HeapSnapshot::GetUid() const {
    return ToInternal(this)->uid();
  }
  
  
  Handle<String> HeapSnapshot::GetTitle() const {
    i::Isolate* isolate = i::Isolate::Current();
    return ToApiHandle<String>(
        isolate->factory()->InternalizeUtf8String(ToInternal(this)->title()));
  }
  
  
  const HeapGraphNode* HeapSnapshot::GetRoot() const {
    return reinterpret_cast<const HeapGraphNode*>(ToInternal(this)->root());
  }
  
  
  const HeapGraphNode* HeapSnapshot::GetNodeById(SnapshotObjectId id) const {
    return reinterpret_cast<const HeapGraphNode*>(
        ToInternal(this)->GetEntryById(id));
  }
  
  
  int HeapSnapshot::GetNodesCount() const {
    return ToInternal(this)->entries().length();
  }
  
  
  const HeapGraphNode* HeapSnapshot::GetNode(int index) const {
    return reinterpret_cast<const HeapGraphNode*>(
        &ToInternal(this)->entries().at(index));
  }
  
  
  SnapshotObjectId HeapSnapshot::GetMaxSnapshotJSObjectId() const {
    return ToInternal(this)->max_snapshot_js_object_id();
  }
  
  
  void HeapSnapshot::Serialize(OutputStream* stream,
                               HeapSnapshot::SerializationFormat format) const {
    Utils::ApiCheck(format == kJSON,
                    "v8::HeapSnapshot::Serialize",
                    "Unknown serialization format");
    Utils::ApiCheck(stream->GetChunkSize() > 0,
                    "v8::HeapSnapshot::Serialize",
                    "Invalid stream chunk size");
    i::HeapSnapshotJSONSerializer serializer(ToInternal(this));
    serializer.Serialize(stream);
  }
  
  
  int HeapProfiler::GetSnapshotCount() {
    return reinterpret_cast<i::HeapProfiler*>(this)->GetSnapshotsCount();
  }
  
  
  const HeapSnapshot* HeapProfiler::GetHeapSnapshot(int index) {
    return reinterpret_cast<const HeapSnapshot*>(
        reinterpret_cast<i::HeapProfiler*>(this)->GetSnapshot(index));
  }
  
  
  SnapshotObjectId HeapProfiler::GetObjectId(Handle<Value> value) {
    i::Handle<i::Object> obj = Utils::OpenHandle(*value);
    return reinterpret_cast<i::HeapProfiler*>(this)->GetSnapshotObjectId(obj);
  }
  
  
  Handle<Value> HeapProfiler::FindObjectById(SnapshotObjectId id) {
    i::Handle<i::Object> obj =
        reinterpret_cast<i::HeapProfiler*>(this)->FindHeapObjectById(id);
    if (obj.is_null()) return Local<Value>();
    return Utils::ToLocal(obj);
  }
  
  
  void HeapProfiler::ClearObjectIds() {
    reinterpret_cast<i::HeapProfiler*>(this)->ClearHeapObjectMap();
  }
  
  
  const HeapSnapshot* HeapProfiler::TakeHeapSnapshot(
      Handle<String> title,
      ActivityControl* control,
      ObjectNameResolver* resolver) {
    return reinterpret_cast<const HeapSnapshot*>(
        reinterpret_cast<i::HeapProfiler*>(this)->TakeSnapshot(
            *Utils::OpenHandle(*title), control, resolver));
  }
  
  
  void HeapProfiler::StartTrackingHeapObjects(bool track_allocations) {
    reinterpret_cast<i::HeapProfiler*>(this)->StartHeapObjectsTracking(
        track_allocations);
  }
  
  
  void HeapProfiler::StopTrackingHeapObjects() {
    reinterpret_cast<i::HeapProfiler*>(this)->StopHeapObjectsTracking();
  }
  
  
  SnapshotObjectId HeapProfiler::GetHeapStats(OutputStream* stream) {
    return reinterpret_cast<i::HeapProfiler*>(this)->PushHeapObjectsStats(stream);
  }
  
  
  void HeapProfiler::DeleteAllHeapSnapshots() {
    reinterpret_cast<i::HeapProfiler*>(this)->DeleteAllSnapshots();
  }
  
  
  void HeapProfiler::SetWrapperClassInfoProvider(uint16_t class_id,
                                                 WrapperInfoCallback callback) {
    reinterpret_cast<i::HeapProfiler*>(this)->DefineWrapperClass(class_id,
                                                                 callback);
  }
  
  
  size_t HeapProfiler::GetProfilerMemorySize() {
    return reinterpret_cast<i::HeapProfiler*>(this)->
        GetMemorySizeUsedByProfiler();
  }
  
  
  void HeapProfiler::SetRetainedObjectInfo(UniqueId id,
                                           RetainedObjectInfo* info) {
    reinterpret_cast<i::HeapProfiler*>(this)->SetRetainedObjectInfo(id, info);
  }
  
  
  v8::Testing::StressType internal::Testing::stress_type_ =
      v8::Testing::kStressTypeOpt;
  
  
  void Testing::SetStressRunType(Testing::StressType type) {
    internal::Testing::set_stress_type(type);
  }
  
  
  int Testing::GetStressRuns() {
    if (internal::FLAG_stress_runs != 0) return internal::FLAG_stress_runs;
  #ifdef DEBUG
    // In debug mode the code runs much slower so stressing will only make two
    // runs.
    return 2;
  #else
    return 5;
  #endif
  }
  
  
  static void SetFlagsFromString(const char* flags) {
    V8::SetFlagsFromString(flags, i::StrLength(flags));
  }
  
  
  void Testing::PrepareStressRun(int run) {
    static const char* kLazyOptimizations =
        "--prepare-always-opt "
        "--max-inlined-source-size=999999 "
        "--max-inlined-nodes=999999 "
        "--max-inlined-nodes-cumulative=999999 "
        "--noalways-opt";
    static const char* kForcedOptimizations = "--always-opt";
  
    // If deoptimization stressed turn on frequent deoptimization. If no value
    // is spefified through --deopt-every-n-times use a default default value.
    static const char* kDeoptEvery13Times = "--deopt-every-n-times=13";
    if (internal::Testing::stress_type() == Testing::kStressTypeDeopt &&
        internal::FLAG_deopt_every_n_times == 0) {
      SetFlagsFromString(kDeoptEvery13Times);
    }
  
  #ifdef DEBUG
    // As stressing in debug mode only make two runs skip the deopt stressing
    // here.
    if (run == GetStressRuns() - 1) {
      SetFlagsFromString(kForcedOptimizations);
    } else {
      SetFlagsFromString(kLazyOptimizations);
    }
  #else
    if (run == GetStressRuns() - 1) {
      SetFlagsFromString(kForcedOptimizations);
    } else if (run != GetStressRuns() - 2) {
      SetFlagsFromString(kLazyOptimizations);
    }
  #endif
  }
  
  
  // TODO(svenpanne) Deprecate this.
  void Testing::DeoptimizeAll() {
    i::Isolate* isolate = i::Isolate::Current();
    i::HandleScope scope(isolate);
    internal::Deoptimizer::DeoptimizeAll(isolate);
  }
  
  
  namespace internal {
  
  
  void HandleScopeImplementer::FreeThreadResources() {
    Free();
  }
  
  
  char* HandleScopeImplementer::ArchiveThread(char* storage) {
    HandleScopeData* current = isolate_->handle_scope_data();
    handle_scope_data_ = *current;
    OS::MemCopy(storage, this, sizeof(*this));
  
    ResetAfterArchive();
    current->Initialize();
  
    return storage + ArchiveSpacePerThread();
  }
  
  
  int HandleScopeImplementer::ArchiveSpacePerThread() {
    return sizeof(HandleScopeImplementer);
  }
  
  
  char* HandleScopeImplementer::RestoreThread(char* storage) {
    OS::MemCopy(this, storage, sizeof(*this));
    *isolate_->handle_scope_data() = handle_scope_data_;
    return storage + ArchiveSpacePerThread();
  }
  
  
  void HandleScopeImplementer::IterateThis(ObjectVisitor* v) {
  #ifdef DEBUG
    bool found_block_before_deferred = false;
  #endif
    // Iterate over all handles in the blocks except for the last.
    for (int i = blocks()->length() - 2; i >= 0; --i) {
      Object** block = blocks()->at(i);
      if (last_handle_before_deferred_block_ != NULL &&
          (last_handle_before_deferred_block_ <= &block[kHandleBlockSize]) &&
          (last_handle_before_deferred_block_ >= block)) {
        v->VisitPointers(block, last_handle_before_deferred_block_);
        ASSERT(!found_block_before_deferred);
  #ifdef DEBUG
        found_block_before_deferred = true;
  #endif
      } else {
        v->VisitPointers(block, &block[kHandleBlockSize]);
      }
    }
  
    ASSERT(last_handle_before_deferred_block_ == NULL ||
           found_block_before_deferred);
  
    // Iterate over live handles in the last block (if any).
    if (!blocks()->is_empty()) {
      v->VisitPointers(blocks()->last(), handle_scope_data_.next);
    }
  
    List<Context*>* context_lists[2] = { &saved_contexts_, &entered_contexts_};
    for (unsigned i = 0; i < ARRAY_SIZE(context_lists); i++) {
      if (context_lists[i]->is_empty()) continue;
      Object** start = reinterpret_cast<Object**>(&context_lists[i]->first());
      v->VisitPointers(start, start + context_lists[i]->length());
    }
  }
  
  
  void HandleScopeImplementer::Iterate(ObjectVisitor* v) {
    HandleScopeData* current = isolate_->handle_scope_data();
    handle_scope_data_ = *current;
    IterateThis(v);
  }
  
  
  char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
    HandleScopeImplementer* scope_implementer =
        reinterpret_cast<HandleScopeImplementer*>(storage);
    scope_implementer->IterateThis(v);
    return storage + ArchiveSpacePerThread();
  }
  
  
  DeferredHandles* HandleScopeImplementer::Detach(Object** prev_limit) {
    DeferredHandles* deferred =
        new DeferredHandles(isolate()->handle_scope_data()->next, isolate());
  
    while (!blocks_.is_empty()) {
      Object** block_start = blocks_.last();
      Object** block_limit = &block_start[kHandleBlockSize];
      // We should not need to check for SealHandleScope here. Assert this.
      ASSERT(prev_limit == block_limit ||
             !(block_start <= prev_limit && prev_limit <= block_limit));
      if (prev_limit == block_limit) break;
      deferred->blocks_.Add(blocks_.last());
      blocks_.RemoveLast();
    }
  
    // deferred->blocks_ now contains the blocks installed on the
    // HandleScope stack since BeginDeferredScope was called, but in
    // reverse order.
  
    ASSERT(prev_limit == NULL || !blocks_.is_empty());
  
    ASSERT(!blocks_.is_empty() && prev_limit != NULL);
    ASSERT(last_handle_before_deferred_block_ != NULL);
    last_handle_before_deferred_block_ = NULL;
    return deferred;
  }
  
  
  void HandleScopeImplementer::BeginDeferredScope() {
    ASSERT(last_handle_before_deferred_block_ == NULL);
    last_handle_before_deferred_block_ = isolate()->handle_scope_data()->next;
  }
  
  
  DeferredHandles::~DeferredHandles() {
    isolate_->UnlinkDeferredHandles(this);
  
    for (int i = 0; i < blocks_.length(); i++) {
  #ifdef ENABLE_HANDLE_ZAPPING
      HandleScope::ZapRange(blocks_[i], &blocks_[i][kHandleBlockSize]);
  #endif
      isolate_->handle_scope_implementer()->ReturnBlock(blocks_[i]);
    }
  }
  
  
  void DeferredHandles::Iterate(ObjectVisitor* v) {
    ASSERT(!blocks_.is_empty());
  
    ASSERT((first_block_limit_ >= blocks_.first()) &&
           (first_block_limit_ <= &(blocks_.first())[kHandleBlockSize]));
  
    v->VisitPointers(blocks_.first(), first_block_limit_);
  
    for (int i = 1; i < blocks_.length(); i++) {
      v->VisitPointers(blocks_[i], &blocks_[i][kHandleBlockSize]);
    }
  }
  
  
  void InvokeAccessorGetterCallback(
      v8::Local<v8::String> property,
      const v8::PropertyCallbackInfo<v8::Value>& info,
      v8::AccessorGetterCallback getter) {
    // Leaving JavaScript.
    Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
    Address getter_address = reinterpret_cast<Address>(reinterpret_cast<intptr_t>(
        getter));
    VMState<EXTERNAL> state(isolate);
    ExternalCallbackScope call_scope(isolate, getter_address);
    getter(property, info);
  }
  
  
  void InvokeFunctionCallback(const v8::FunctionCallbackInfo<v8::Value>& info,
                              v8::FunctionCallback callback) {
    Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
    Address callback_address =
        reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
    VMState<EXTERNAL> state(isolate);
    ExternalCallbackScope call_scope(isolate, callback_address);
    callback(info);
  }
  
  
  } }  // namespace v8::internal
  
  #pragma clang diagnostic pop
  