src/api/api.cc

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

#include "src/api/api.h"

#include <algorithm>  // For min
#include <cmath>      // For isnan.
#include <limits>
#include <sstream>
#include <string>
#include <utility>  // For move
#include <vector>

#include "include/v8-callbacks.h"
#include "include/v8-cppgc.h"
#include "include/v8-date.h"
#include "include/v8-embedder-state-scope.h"
#include "include/v8-extension.h"
#include "include/v8-fast-api-calls.h"
#include "include/v8-function.h"
#include "include/v8-json.h"
#include "include/v8-locker.h"
#include "include/v8-primitive-object.h"
#include "include/v8-profiler.h"
#include "include/v8-unwinder-state.h"
#include "include/v8-util.h"
#include "include/v8-wasm.h"
#include "src/api/api-inl.h"
#include "src/api/api-natives.h"
#include "src/base/functional.h"
#include "src/base/logging.h"
#include "src/base/platform/platform.h"
#include "src/base/platform/time.h"
#include "src/base/safe_conversions.h"
#include "src/base/utils/random-number-generator.h"
#include "src/baseline/baseline-batch-compiler.h"
#include "src/builtins/accessors.h"
#include "src/builtins/builtins-utils.h"
#include "src/codegen/compiler.h"
#include "src/codegen/cpu-features.h"
#include "src/codegen/script-details.h"
#include "src/common/assert-scope.h"
#include "src/common/globals.h"
#include "src/compiler-dispatcher/lazy-compile-dispatcher.h"
#include "src/date/date.h"
#include "src/objects/primitive-heap-object.h"
#if V8_ENABLE_WEBASSEMBLY
#include "src/debug/debug-wasm-objects.h"
#endif  // V8_ENABLE_WEBASSEMBLY
#include "src/debug/liveedit.h"
#include "src/deoptimizer/deoptimizer.h"
#include "src/diagnostics/gdb-jit.h"
#include "src/execution/embedder-state.h"
#include "src/execution/execution.h"
#include "src/execution/frames-inl.h"
#include "src/execution/isolate-inl.h"
#include "src/execution/messages.h"
#include "src/execution/microtask-queue.h"
#include "src/execution/simulator.h"
#include "src/execution/v8threads.h"
#include "src/execution/vm-state-inl.h"
#include "src/handles/global-handles.h"
#include "src/handles/persistent-handles.h"
#include "src/heap/embedder-tracing.h"
#include "src/heap/heap-inl.h"
#include "src/heap/heap-write-barrier.h"
#include "src/heap/safepoint.h"
#include "src/init/bootstrapper.h"
#include "src/init/icu_util.h"
#include "src/init/startup-data-util.h"
#include "src/init/v8.h"
#include "src/json/json-parser.h"
#include "src/json/json-stringifier.h"
#include "src/logging/counters-scopes.h"
#include "src/logging/metrics.h"
#include "src/logging/runtime-call-stats-scope.h"
#include "src/logging/tracing-flags.h"
#include "src/numbers/conversions-inl.h"
#include "src/objects/api-callbacks.h"
#include "src/objects/contexts.h"
#include "src/objects/embedder-data-array-inl.h"
#include "src/objects/embedder-data-slot-inl.h"
#include "src/objects/hash-table-inl.h"
#include "src/objects/heap-object.h"
#include "src/objects/js-array-buffer-inl.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/js-collection-inl.h"
#include "src/objects/js-promise-inl.h"
#include "src/objects/js-regexp-inl.h"
#include "src/objects/js-weak-refs-inl.h"
#include "src/objects/module-inl.h"
#include "src/objects/objects-inl.h"
#include "src/objects/oddball.h"
#include "src/objects/ordered-hash-table-inl.h"
#include "src/objects/property-descriptor.h"
#include "src/objects/property-details.h"
#include "src/objects/property.h"
#include "src/objects/prototype.h"
#include "src/objects/shared-function-info.h"
#include "src/objects/slots.h"
#include "src/objects/smi.h"
#include "src/objects/synthetic-module-inl.h"
#include "src/objects/templates.h"
#include "src/objects/value-serializer.h"
#include "src/parsing/parse-info.h"
#include "src/parsing/parser.h"
#include "src/parsing/pending-compilation-error-handler.h"
#include "src/parsing/scanner-character-streams.h"
#include "src/profiler/cpu-profiler.h"
#include "src/profiler/heap-profiler.h"
#include "src/profiler/heap-snapshot-generator-inl.h"
#include "src/profiler/profile-generator-inl.h"
#include "src/profiler/tick-sample.h"
#include "src/regexp/regexp-utils.h"
#include "src/runtime/runtime.h"
#include "src/sandbox/external-pointer.h"
#include "src/sandbox/sandbox.h"
#include "src/snapshot/code-serializer.h"
#include "src/snapshot/embedded/embedded-data.h"
#include "src/snapshot/snapshot.h"
#include "src/snapshot/startup-serializer.h"  // For SerializedHandleChecker.
#include "src/strings/char-predicates-inl.h"
#include "src/strings/string-hasher.h"
#include "src/strings/unicode-inl.h"
#include "src/tracing/trace-event.h"
#include "src/utils/detachable-vector.h"
#include "src/utils/version.h"
#include "src/web-snapshot/web-snapshot.h"

#if V8_ENABLE_WEBASSEMBLY
#include "src/trap-handler/trap-handler.h"
#include "src/wasm/streaming-decoder.h"
#include "src/wasm/value-type.h"
#include "src/wasm/wasm-engine.h"
#include "src/wasm/wasm-js.h"
#include "src/wasm/wasm-objects-inl.h"
#include "src/wasm/wasm-result.h"
#include "src/wasm/wasm-serialization.h"
#endif  // V8_ENABLE_WEBASSEMBLY

#if V8_OS_LINUX || V8_OS_DARWIN || V8_OS_FREEBSD
#include <signal.h>
#include "include/v8-wasm-trap-handler-posix.h"
#include "src/trap-handler/handler-inside-posix.h"
#endif

#if V8_OS_WIN
#include <windows.h>

// This has to come after windows.h.
#include <versionhelpers.h>

#include "include/v8-wasm-trap-handler-win.h"
#include "src/trap-handler/handler-inside-win.h"
#if defined(V8_OS_WIN64)
#include "src/base/platform/wrappers.h"
#include "src/diagnostics/unwinding-info-win64.h"
#endif  // V8_OS_WIN64
#if defined(V8_ENABLE_SYSTEM_INSTRUMENTATION)
#include "src/diagnostics/system-jit-win.h"
#endif
#endif  // V8_OS_WIN

// Has to be the last include (doesn't have include guards):
#include "src/api/api-macros.h"

#define TRACE_BS(...)                                     \
  do {                                                    \
    if (i::FLAG_trace_backing_store) PrintF(__VA_ARGS__); \
  } while (false)

namespace v8 {

static ScriptOrigin GetScriptOriginForScript(i::Isolate* isolate,
                                             i::Handle<i::Script> script) {
  i::Handle<i::Object> scriptName(script->GetNameOrSourceURL(), isolate);
  i::Handle<i::Object> source_map_url(script->source_mapping_url(), isolate);
  i::Handle<i::Object> host_defined_options(script->host_defined_options(),
                                            isolate);
  ScriptOriginOptions options(script->origin_options());
  bool is_wasm = false;
#if V8_ENABLE_WEBASSEMBLY
  is_wasm = script->type() == i::Script::TYPE_WASM;
#endif  // V8_ENABLE_WEBASSEMBLY
  v8::ScriptOrigin origin(
      reinterpret_cast<v8::Isolate*>(isolate), Utils::ToLocal(scriptName),
      script->line_offset(), script->column_offset(),
      options.IsSharedCrossOrigin(), script->id(),
      Utils::ToLocal(source_map_url), options.IsOpaque(), is_wasm,
      options.IsModule(), Utils::ToLocal(host_defined_options));
  return origin;
}

Local<PrimitiveArray> ScriptOrigin::HostDefinedOptions() const {
  // TODO(cbruni, chromium:1244145): remove once migrated to the context.
  Utils::ApiCheck(!host_defined_options_->IsFixedArray(),
                  "ScriptOrigin::HostDefinedOptions",
                  "HostDefinedOptions is not a PrimitiveArray, please use "
                  "ScriptOrigin::GetHostDefinedOptions()");
  i::Handle<i::FixedArray> options =
      Utils::OpenHandle(*host_defined_options_.As<FixedArray>());
  return Utils::PrimitiveArrayToLocal(options);
}

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

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

// When V8 cannot allocate memory FatalProcessOutOfMemory is called. The default
// OOM error handler is called and execution is stopped.
void i::V8::FatalProcessOutOfMemory(i::Isolate* isolate, const char* location,
                                    bool is_heap_oom) {
  char last_few_messages[Heap::kTraceRingBufferSize + 1];
  char js_stacktrace[Heap::kStacktraceBufferSize + 1];
  i::HeapStats heap_stats;

  if (isolate == nullptr) {
    isolate = Isolate::TryGetCurrent();
  }

  if (isolate == nullptr) {
    // If the Isolate is not available for the current thread we cannot retrieve
    // memory information from the Isolate. Write easy-to-recognize values on
    // the stack.
    memset(last_few_messages, 0x0BADC0DE, Heap::kTraceRingBufferSize + 1);
    memset(js_stacktrace, 0x0BADC0DE, Heap::kStacktraceBufferSize + 1);
    memset(&heap_stats, 0xBADC0DE, sizeof(heap_stats));
    // Note that the embedder's oom handler is also not available and therefore
    // won't be called in this case. We just crash.
    FATAL("Fatal process out of memory: %s", location);
    UNREACHABLE();
  }

  memset(last_few_messages, 0, Heap::kTraceRingBufferSize + 1);
  memset(js_stacktrace, 0, Heap::kStacktraceBufferSize + 1);

  intptr_t start_marker;
  heap_stats.start_marker = &start_marker;
  size_t ro_space_size;
  heap_stats.ro_space_size = &ro_space_size;
  size_t ro_space_capacity;
  heap_stats.ro_space_capacity = &ro_space_capacity;
  size_t new_space_size;
  heap_stats.new_space_size = &new_space_size;
  size_t new_space_capacity;
  heap_stats.new_space_capacity = &new_space_capacity;
  size_t old_space_size;
  heap_stats.old_space_size = &old_space_size;
  size_t old_space_capacity;
  heap_stats.old_space_capacity = &old_space_capacity;
  size_t code_space_size;
  heap_stats.code_space_size = &code_space_size;
  size_t code_space_capacity;
  heap_stats.code_space_capacity = &code_space_capacity;
  size_t map_space_size;
  heap_stats.map_space_size = &map_space_size;
  size_t map_space_capacity;
  heap_stats.map_space_capacity = &map_space_capacity;
  size_t lo_space_size;
  heap_stats.lo_space_size = &lo_space_size;
  size_t code_lo_space_size;
  heap_stats.code_lo_space_size = &code_lo_space_size;
  size_t global_handle_count;
  heap_stats.global_handle_count = &global_handle_count;
  size_t weak_global_handle_count;
  heap_stats.weak_global_handle_count = &weak_global_handle_count;
  size_t pending_global_handle_count;
  heap_stats.pending_global_handle_count = &pending_global_handle_count;
  size_t near_death_global_handle_count;
  heap_stats.near_death_global_handle_count = &near_death_global_handle_count;
  size_t free_global_handle_count;
  heap_stats.free_global_handle_count = &free_global_handle_count;
  size_t memory_allocator_size;
  heap_stats.memory_allocator_size = &memory_allocator_size;
  size_t memory_allocator_capacity;
  heap_stats.memory_allocator_capacity = &memory_allocator_capacity;
  size_t malloced_memory;
  heap_stats.malloced_memory = &malloced_memory;
  size_t malloced_peak_memory;
  heap_stats.malloced_peak_memory = &malloced_peak_memory;
  size_t objects_per_type[LAST_TYPE + 1] = {0};
  heap_stats.objects_per_type = objects_per_type;
  size_t size_per_type[LAST_TYPE + 1] = {0};
  heap_stats.size_per_type = size_per_type;
  int os_error;
  heap_stats.os_error = &os_error;
  heap_stats.last_few_messages = last_few_messages;
  heap_stats.js_stacktrace = js_stacktrace;
  intptr_t end_marker;
  heap_stats.end_marker = &end_marker;
  if (isolate->heap()->HasBeenSetUp()) {
    // BUG(1718): Don't use the take_snapshot since we don't support
    // HeapObjectIterator here without doing a special GC.
    isolate->heap()->RecordStats(&heap_stats, false);
    if (!FLAG_correctness_fuzzer_suppressions) {
      char* first_newline = strchr(last_few_messages, '\n');
      if (first_newline == nullptr || first_newline[1] == '\0')
        first_newline = last_few_messages;
      base::OS::PrintError("\n<--- Last few GCs --->\n%s\n", first_newline);
      base::OS::PrintError("\n<--- JS stacktrace --->\n%s\n", js_stacktrace);
    }
  }
  Utils::ReportOOMFailure(isolate, location, is_heap_oom);
  // 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::TryGetCurrent();
  FatalErrorCallback callback = nullptr;
  if (isolate != nullptr) {
    callback = isolate->exception_behavior();
  }
  if (callback == nullptr) {
    base::OS::PrintError("\n#\n# Fatal error in %s\n# %s\n#\n\n", location,
                         message);
    base::OS::Abort();
  } else {
    callback(location, message);
  }
  isolate->SignalFatalError();
}

void Utils::ReportOOMFailure(i::Isolate* isolate, const char* location,
                             bool is_heap_oom) {
  OOMErrorCallback oom_callback = isolate->oom_behavior();
  if (oom_callback == nullptr) {
    // TODO(wfh): Remove this fallback once Blink is setting OOM handler. See
    // crbug.com/614440.
    FatalErrorCallback fatal_callback = isolate->exception_behavior();
    if (fatal_callback == nullptr) {
      base::OS::PrintError("\n#\n# Fatal %s OOM in %s\n#\n\n",
                           is_heap_oom ? "javascript" : "process", location);
#ifdef V8_FUZZILLI
      exit(0);
#else
      base::OS::Abort();
#endif  // V8_FUZZILLI
    } else {
      fatal_callback(location,
                     is_heap_oom
                         ? "Allocation failed - JavaScript heap out of memory"
                         : "Allocation failed - process out of memory");
    }
  } else {
    oom_callback(location, is_heap_oom);
  }
  isolate->SignalFatalError();
}

void V8::SetSnapshotDataBlob(StartupData* snapshot_blob) {
  i::V8::SetSnapshotBlob(snapshot_blob);
}

namespace {

#ifdef V8_SANDBOXED_POINTERS
// ArrayBufferAllocator to use when sandboxed pointers are used in which case
// all ArrayBuffer backing stores need to be allocated inside the sandbox.
// Note, the current implementation is extremely inefficient as it uses the
// BoundedPageAllocator. In the future, we'll need a proper allocator
// implementation.
class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
 public:
  ArrayBufferAllocator() { CHECK(page_allocator_); }

  void* Allocate(size_t length) override {
    return page_allocator_->AllocatePages(nullptr, RoundUp(length, page_size_),
                                          page_size_,
                                          PageAllocator::kReadWrite);
  }

  void* AllocateUninitialized(size_t length) override {
    return Allocate(length);
  }

  void Free(void* data, size_t length) override {
    page_allocator_->FreePages(data, RoundUp(length, page_size_));
  }

 private:
  PageAllocator* page_allocator_ = internal::GetArrayBufferPageAllocator();
  const size_t page_size_ = page_allocator_->AllocatePageSize();
};

#else

class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
 public:
  void* Allocate(size_t length) override {
#if V8_OS_AIX && _LINUX_SOURCE_COMPAT
    // Work around for GCC bug on AIX
    // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79839
    void* data = __linux_calloc(length, 1);
#else
    void* data = base::Calloc(length, 1);
#endif
    return data;
  }

  void* AllocateUninitialized(size_t length) override {
#if V8_OS_AIX && _LINUX_SOURCE_COMPAT
    // Work around for GCC bug on AIX
    // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79839
    void* data = __linux_malloc(length);
#else
    void* data = base::Malloc(length);
#endif
    return data;
  }

  void Free(void* data, size_t) override { base::Free(data); }

  void* Reallocate(void* data, size_t old_length, size_t new_length) override {
#if V8_OS_AIX && _LINUX_SOURCE_COMPAT
    // Work around for GCC bug on AIX
    // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79839
    void* new_data = __linux_realloc(data, new_length);
#else
    void* new_data = base::Realloc(data, new_length);
#endif
    if (new_length > old_length) {
      memset(reinterpret_cast<uint8_t*>(new_data) + old_length, 0,
             new_length - old_length);
    }
    return new_data;
  }
};
#endif  // V8_SANDBOXED_POINTERS

struct SnapshotCreatorData {
  explicit SnapshotCreatorData(Isolate* isolate)
      : isolate_(isolate),
        default_context_(),
        contexts_(isolate),
        created_(false) {}

  static SnapshotCreatorData* cast(void* data) {
    return reinterpret_cast<SnapshotCreatorData*>(data);
  }

  ArrayBufferAllocator allocator_;
  Isolate* isolate_;
  Persistent<Context> default_context_;
  SerializeInternalFieldsCallback default_embedder_fields_serializer_;
  PersistentValueVector<Context> contexts_;
  std::vector<SerializeInternalFieldsCallback> embedder_fields_serializers_;
  bool created_;
};

}  // namespace

SnapshotCreator::SnapshotCreator(Isolate* isolate,
                                 const intptr_t* external_references,
                                 StartupData* existing_snapshot) {
  SnapshotCreatorData* data = new SnapshotCreatorData(isolate);
  i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
  internal_isolate->set_array_buffer_allocator(&data->allocator_);
  internal_isolate->set_api_external_references(external_references);
  internal_isolate->enable_serializer();
  isolate->Enter();
  const StartupData* blob = existing_snapshot
                                ? existing_snapshot
                                : i::Snapshot::DefaultSnapshotBlob();
  if (blob && blob->raw_size > 0) {
    internal_isolate->set_snapshot_blob(blob);
    i::Snapshot::Initialize(internal_isolate);
  } else {
    internal_isolate->InitWithoutSnapshot();
  }
  data_ = data;
  // Disable batch compilation during snapshot creation.
  internal_isolate->baseline_batch_compiler()->set_enabled(false);
}

SnapshotCreator::SnapshotCreator(const intptr_t* external_references,
                                 StartupData* existing_snapshot)
    : SnapshotCreator(Isolate::Allocate(), external_references,
                      existing_snapshot) {}

SnapshotCreator::~SnapshotCreator() {
  SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
  DCHECK(data->created_);
  Isolate* isolate = data->isolate_;
  isolate->Exit();
  isolate->Dispose();
  delete data;
}

Isolate* SnapshotCreator::GetIsolate() {
  return SnapshotCreatorData::cast(data_)->isolate_;
}

void SnapshotCreator::SetDefaultContext(
    Local<Context> context, SerializeInternalFieldsCallback callback) {
  DCHECK(!context.IsEmpty());
  SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
  DCHECK(!data->created_);
  DCHECK(data->default_context_.IsEmpty());
  Isolate* isolate = data->isolate_;
  CHECK_EQ(isolate, context->GetIsolate());
  data->default_context_.Reset(isolate, context);
  data->default_embedder_fields_serializer_ = callback;
}

size_t SnapshotCreator::AddContext(Local<Context> context,
                                   SerializeInternalFieldsCallback callback) {
  DCHECK(!context.IsEmpty());
  SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
  DCHECK(!data->created_);
  Isolate* isolate = data->isolate_;
  CHECK_EQ(isolate, context->GetIsolate());
  size_t index = data->contexts_.Size();
  data->contexts_.Append(context);
  data->embedder_fields_serializers_.push_back(callback);
  return index;
}

size_t SnapshotCreator::AddData(i::Address object) {
  DCHECK_NE(object, i::kNullAddress);
  SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
  DCHECK(!data->created_);
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(data->isolate_);
  i::HandleScope scope(isolate);
  i::Handle<i::Object> obj(i::Object(object), isolate);
  i::Handle<i::ArrayList> list;
  if (!isolate->heap()->serialized_objects().IsArrayList()) {
    list = i::ArrayList::New(isolate, 1);
  } else {
    list = i::Handle<i::ArrayList>(
        i::ArrayList::cast(isolate->heap()->serialized_objects()), isolate);
  }
  size_t index = static_cast<size_t>(list->Length());
  list = i::ArrayList::Add(isolate, list, obj);
  isolate->heap()->SetSerializedObjects(*list);
  return index;
}

size_t SnapshotCreator::AddData(Local<Context> context, i::Address object) {
  DCHECK_NE(object, i::kNullAddress);
  DCHECK(!SnapshotCreatorData::cast(data_)->created_);
  i::Handle<i::Context> ctx = Utils::OpenHandle(*context);
  i::Isolate* isolate = ctx->GetIsolate();
  i::HandleScope scope(isolate);
  i::Handle<i::Object> obj(i::Object(object), isolate);
  i::Handle<i::ArrayList> list;
  if (!ctx->serialized_objects().IsArrayList()) {
    list = i::ArrayList::New(isolate, 1);
  } else {
    list = i::Handle<i::ArrayList>(
        i::ArrayList::cast(ctx->serialized_objects()), isolate);
  }
  size_t index = static_cast<size_t>(list->Length());
  list = i::ArrayList::Add(isolate, list, obj);
  ctx->set_serialized_objects(*list);
  return index;
}

namespace {
void ConvertSerializedObjectsToFixedArray(Local<Context> context) {
  i::Handle<i::Context> ctx = Utils::OpenHandle(*context);
  i::Isolate* isolate = ctx->GetIsolate();
  if (!ctx->serialized_objects().IsArrayList()) {
    ctx->set_serialized_objects(i::ReadOnlyRoots(isolate).empty_fixed_array());
  } else {
    i::Handle<i::ArrayList> list(i::ArrayList::cast(ctx->serialized_objects()),
                                 isolate);
    i::Handle<i::FixedArray> elements = i::ArrayList::Elements(isolate, list);
    ctx->set_serialized_objects(*elements);
  }
}

void ConvertSerializedObjectsToFixedArray(i::Isolate* isolate) {
  if (!isolate->heap()->serialized_objects().IsArrayList()) {
    isolate->heap()->SetSerializedObjects(
        i::ReadOnlyRoots(isolate).empty_fixed_array());
  } else {
    i::Handle<i::ArrayList> list(
        i::ArrayList::cast(isolate->heap()->serialized_objects()), isolate);
    i::Handle<i::FixedArray> elements = i::ArrayList::Elements(isolate, list);
    isolate->heap()->SetSerializedObjects(*elements);
  }
}
}  // anonymous namespace

StartupData SnapshotCreator::CreateBlob(
    SnapshotCreator::FunctionCodeHandling function_code_handling) {
  SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(data->isolate_);
  DCHECK(!data->created_);
  DCHECK(!data->default_context_.IsEmpty());

  const int num_additional_contexts = static_cast<int>(data->contexts_.Size());
  const int num_contexts = num_additional_contexts + 1;  // The default context.

  // Create and store lists of embedder-provided data needed during
  // serialization.
  {
    i::HandleScope scope(isolate);
    // Convert list of context-independent data to FixedArray.
    ConvertSerializedObjectsToFixedArray(isolate);

    // Convert lists of context-dependent data to FixedArray.
    ConvertSerializedObjectsToFixedArray(
        data->default_context_.Get(data->isolate_));
    for (int i = 0; i < num_additional_contexts; i++) {
      ConvertSerializedObjectsToFixedArray(data->contexts_.Get(i));
    }

    // We need to store the global proxy size upfront in case we need the
    // bootstrapper to create a global proxy before we deserialize the context.
    i::Handle<i::FixedArray> global_proxy_sizes =
        isolate->factory()->NewFixedArray(num_additional_contexts,
                                          i::AllocationType::kOld);
    for (int i = 0; i < num_additional_contexts; i++) {
      i::Handle<i::Context> context =
          v8::Utils::OpenHandle(*data->contexts_.Get(i));
      global_proxy_sizes->set(i,
                              i::Smi::FromInt(context->global_proxy().Size()));
    }
    isolate->heap()->SetSerializedGlobalProxySizes(*global_proxy_sizes);
  }

  // We might rehash strings and re-sort descriptors. Clear the lookup cache.
  isolate->descriptor_lookup_cache()->Clear();

  // If we don't do this then we end up with a stray root pointing at the
  // context even after we have disposed of the context.
  isolate->heap()->CollectAllAvailableGarbage(
      i::GarbageCollectionReason::kSnapshotCreator);
  {
    i::HandleScope scope(isolate);
    isolate->heap()->CompactWeakArrayLists();
  }

  i::Snapshot::ClearReconstructableDataForSerialization(
      isolate, function_code_handling == FunctionCodeHandling::kClear);

  i::GlobalSafepointScope global_safepoint(isolate);
  i::DisallowGarbageCollection no_gc_from_here_on;

  // Create a vector with all contexts and clear associated Persistent fields.
  // Note these contexts may be dead after calling Clear(), but will not be
  // collected until serialization completes and the DisallowGarbageCollection
  // scope above goes out of scope.
  std::vector<i::Context> contexts;
  contexts.reserve(num_contexts);
  {
    i::HandleScope scope(isolate);
    contexts.push_back(
        *v8::Utils::OpenHandle(*data->default_context_.Get(data->isolate_)));
    data->default_context_.Reset();
    for (int i = 0; i < num_additional_contexts; i++) {
      i::Handle<i::Context> context =
          v8::Utils::OpenHandle(*data->contexts_.Get(i));
      contexts.push_back(*context);
    }
    data->contexts_.Clear();
  }

  // Check that values referenced by global/eternal handles are accounted for.
  i::SerializedHandleChecker handle_checker(isolate, &contexts);
  CHECK(handle_checker.CheckGlobalAndEternalHandles());

  // Create a vector with all embedder fields serializers.
  std::vector<SerializeInternalFieldsCallback> embedder_fields_serializers;
  embedder_fields_serializers.reserve(num_contexts);
  embedder_fields_serializers.push_back(
      data->default_embedder_fields_serializer_);
  for (int i = 0; i < num_additional_contexts; i++) {
    embedder_fields_serializers.push_back(
        data->embedder_fields_serializers_[i]);
  }

  data->created_ = true;
  return i::Snapshot::Create(isolate, &contexts, embedder_fields_serializers,
                             global_safepoint, no_gc_from_here_on);
}

bool StartupData::CanBeRehashed() const {
  DCHECK(i::Snapshot::VerifyChecksum(this));
  return i::Snapshot::ExtractRehashability(this);
}

bool StartupData::IsValid() const { return i::Snapshot::VersionIsValid(this); }

void V8::SetDcheckErrorHandler(DcheckErrorCallback that) {
  v8::base::SetDcheckFunction(that);
}

void V8::SetFlagsFromString(const char* str) {
  SetFlagsFromString(str, strlen(str));
}

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

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

RegisteredExtension* RegisteredExtension::first_extension_ = nullptr;

RegisteredExtension::RegisteredExtension(std::unique_ptr<Extension> extension)
    : extension_(std::move(extension)) {}

// static
void RegisteredExtension::Register(std::unique_ptr<Extension> extension) {
  RegisteredExtension* new_extension =
      new RegisteredExtension(std::move(extension));
  new_extension->next_ = first_extension_;
  first_extension_ = new_extension;
}

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

namespace {
class ExtensionResource : public String::ExternalOneByteStringResource {
 public:
  ExtensionResource() : data_(nullptr), length_(0) {}
  ExtensionResource(const char* data, size_t length)
      : data_(data), length_(length) {}
  const char* data() const override { return data_; }
  size_t length() const override { return length_; }
  void Dispose() override {}

 private:
  const char* data_;
  size_t length_;
};
}  // anonymous namespace

void RegisterExtension(std::unique_ptr<Extension> extension) {
  RegisteredExtension::Register(std::move(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)),
      dep_count_(dep_count),
      deps_(deps),
      auto_enable_(false) {
  source_ = new ExtensionResource(source, source_length_);
  CHECK(source != nullptr || source_length_ == 0);
}

void ResourceConstraints::ConfigureDefaultsFromHeapSize(
    size_t initial_heap_size_in_bytes, size_t maximum_heap_size_in_bytes) {
  CHECK_LE(initial_heap_size_in_bytes, maximum_heap_size_in_bytes);
  if (maximum_heap_size_in_bytes == 0) {
    return;
  }
  size_t young_generation, old_generation;
  i::Heap::GenerationSizesFromHeapSize(maximum_heap_size_in_bytes,
                                       &young_generation, &old_generation);
  set_max_young_generation_size_in_bytes(
      std::max(young_generation, i::Heap::MinYoungGenerationSize()));
  set_max_old_generation_size_in_bytes(
      std::max(old_generation, i::Heap::MinOldGenerationSize()));
  if (initial_heap_size_in_bytes > 0) {
    i::Heap::GenerationSizesFromHeapSize(initial_heap_size_in_bytes,
                                         &young_generation, &old_generation);
    // We do not set lower bounds for the initial sizes.
    set_initial_young_generation_size_in_bytes(young_generation);
    set_initial_old_generation_size_in_bytes(old_generation);
  }
  if (i::kPlatformRequiresCodeRange) {
    set_code_range_size_in_bytes(
        std::min(i::kMaximalCodeRangeSize, maximum_heap_size_in_bytes));
  }
}

void ResourceConstraints::ConfigureDefaults(uint64_t physical_memory,
                                            uint64_t virtual_memory_limit) {
  size_t heap_size = i::Heap::HeapSizeFromPhysicalMemory(physical_memory);
  size_t young_generation, old_generation;
  i::Heap::GenerationSizesFromHeapSize(heap_size, &young_generation,
                                       &old_generation);
  set_max_young_generation_size_in_bytes(young_generation);
  set_max_old_generation_size_in_bytes(old_generation);

  if (virtual_memory_limit > 0 && i::kPlatformRequiresCodeRange) {
    set_code_range_size_in_bytes(
        std::min(i::kMaximalCodeRangeSize,
                 static_cast<size_t>(virtual_memory_limit / 8)));
  }
}

namespace internal {

i::Address* GlobalizeTracedReference(
    i::Isolate* isolate, i::Address* obj, internal::Address* slot,
    GlobalHandleDestructionMode destruction_mode,
    GlobalHandleStoreMode store_mode) {
  LOG_API(isolate, TracedGlobal, New);
#ifdef DEBUG
  Utils::ApiCheck((slot != nullptr), "v8::GlobalizeTracedReference",
                  "the address slot must be not null");
#endif
  i::Handle<i::Object> result = isolate->global_handles()->CreateTraced(
      *obj, slot, destruction_mode, store_mode);
#ifdef VERIFY_HEAP
  if (i::FLAG_verify_heap) {
    i::Object(*obj).ObjectVerify(isolate);
  }
#endif  // VERIFY_HEAP
  return result.location();
}

void MoveTracedGlobalReference(internal::Address** from,
                               internal::Address** to) {
  GlobalHandles::MoveTracedGlobal(from, to);
}

void CopyTracedGlobalReference(const internal::Address* const* from,
                               internal::Address** to) {
  GlobalHandles::CopyTracedGlobal(from, to);
}

void DisposeTracedGlobal(internal::Address* location) {
  GlobalHandles::DestroyTraced(location);
}

void SetFinalizationCallbackTraced(internal::Address* location, void* parameter,
                                   WeakCallbackInfo<void>::Callback callback) {
  GlobalHandles::SetFinalizationCallbackForTraced(location, parameter,
                                                  callback);
}

}  // namespace internal

namespace api_internal {

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

i::Address* CopyGlobalReference(i::Address* from) {
  i::Handle<i::Object> result = i::GlobalHandles::CopyGlobal(from);
  return result.location();
}

void MoveGlobalReference(internal::Address** from, internal::Address** to) {
  i::GlobalHandles::MoveGlobal(from, to);
}

void MakeWeak(i::Address* location, void* parameter,
              WeakCallbackInfo<void>::Callback weak_callback,
              WeakCallbackType type) {
  i::GlobalHandles::MakeWeak(location, parameter, weak_callback, type);
}

void MakeWeak(i::Address** location_addr) {
  i::GlobalHandles::MakeWeak(location_addr);
}

void* ClearWeak(i::Address* location) {
  return i::GlobalHandles::ClearWeakness(location);
}

void AnnotateStrongRetainer(i::Address* location, const char* label) {
  i::GlobalHandles::AnnotateStrongRetainer(location, label);
}

void DisposeGlobal(i::Address* location) {
  i::GlobalHandles::Destroy(location);
}

Value* Eternalize(Isolate* v8_isolate, Value* value) {
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  i::Object object = *Utils::OpenHandle(value);
  int index = -1;
  isolate->eternal_handles()->Create(isolate, object, &index);
  return reinterpret_cast<Value*>(
      isolate->eternal_handles()->Get(index).location());
}

void FromJustIsNothing() {
  Utils::ApiCheck(false, "v8::FromJust", "Maybe value is Nothing.");
}

void ToLocalEmpty() {
  Utils::ApiCheck(false, "v8::ToLocalChecked", "Empty MaybeLocal.");
}

void InternalFieldOutOfBounds(int index) {
  Utils::ApiCheck(0 <= index && index < kInternalFieldsInWeakCallback,
                  "WeakCallbackInfo::GetInternalField",
                  "Internal field out of bounds.");
}

}  // namespace api_internal

// --- 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.
  // We make an exception if the serializer is enabled, which means that the
  // Isolate is exclusively used to create a snapshot.
  Utils::ApiCheck(
      !internal_isolate->was_locker_ever_used() ||
          internal_isolate->thread_manager()->IsLockedByCurrentThread() ||
          internal_isolate->serializer_enabled(),
      "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_);
}

void* HandleScope::operator new(size_t) { base::OS::Abort(); }
void* HandleScope::operator new[](size_t) { base::OS::Abort(); }
void HandleScope::operator delete(void*, size_t) { base::OS::Abort(); }
void HandleScope::operator delete[](void*, size_t) { base::OS::Abort(); }

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

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

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

i::Address* EscapableHandleScope::Escape(i::Address* escape_value) {
  i::Heap* heap = reinterpret_cast<i::Isolate*>(GetIsolate())->heap();
  Utils::ApiCheck(i::Object(*escape_slot_).IsTheHole(heap->isolate()),
                  "EscapableHandleScope::Escape", "Escape value set twice");
  if (escape_value == nullptr) {
    *escape_slot_ = i::ReadOnlyRoots(heap).undefined_value().ptr();
    return nullptr;
  }
  *escape_slot_ = *escape_value;
  return escape_slot_;
}

void* EscapableHandleScope::operator new(size_t) { base::OS::Abort(); }
void* EscapableHandleScope::operator new[](size_t) { base::OS::Abort(); }
void EscapableHandleScope::operator delete(void*, size_t) { base::OS::Abort(); }
void EscapableHandleScope::operator delete[](void*, size_t) {
  base::OS::Abort();
}

SealHandleScope::SealHandleScope(Isolate* isolate)
    : isolate_(reinterpret_cast<i::Isolate*>(isolate)) {
  i::HandleScopeData* current = isolate_->handle_scope_data();
  prev_limit_ = current->limit;
  current->limit = current->next;
  prev_sealed_level_ = current->sealed_level;
  current->sealed_level = current->level;
}

SealHandleScope::~SealHandleScope() {
  i::HandleScopeData* current = isolate_->handle_scope_data();
  DCHECK_EQ(current->next, current->limit);
  current->limit = prev_limit_;
  DCHECK_EQ(current->level, current->sealed_level);
  current->sealed_level = prev_sealed_level_;
}

void* SealHandleScope::operator new(size_t) { base::OS::Abort(); }
void* SealHandleScope::operator new[](size_t) { base::OS::Abort(); }
void SealHandleScope::operator delete(void*, size_t) { base::OS::Abort(); }
void SealHandleScope::operator delete[](void*, size_t) { base::OS::Abort(); }

bool Data::IsModule() const { return Utils::OpenHandle(this)->IsModule(); }
bool Data::IsFixedArray() const {
  return Utils::OpenHandle(this)->IsFixedArray();
}

bool Data::IsValue() const {
  i::DisallowGarbageCollection no_gc;
  i::Object self = *Utils::OpenHandle(this);
  if (self.IsSmi()) return true;
  i::HeapObject heap_object = i::HeapObject::cast(self);
  DCHECK(!heap_object.IsTheHole());
  if (heap_object.IsSymbol()) {
    return !i::Symbol::cast(heap_object).is_private();
  }
  return heap_object.IsPrimitiveHeapObject() || heap_object.IsJSReceiver();
}

bool Data::IsPrivate() const {
  return Utils::OpenHandle(this)->IsPrivateSymbol();
}

bool Data::IsObjectTemplate() const {
  return Utils::OpenHandle(this)->IsObjectTemplateInfo();
}

bool Data::IsFunctionTemplate() const {
  return Utils::OpenHandle(this)->IsFunctionTemplateInfo();
}

bool Data::IsContext() const { return Utils::OpenHandle(this)->IsContext(); }

void Context::Enter() {
  i::Handle<i::Context> env = Utils::OpenHandle(this);
  i::Isolate* isolate = env->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(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_NO_SCRIPT_NO_EXCEPTION(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());
}

Context::BackupIncumbentScope::BackupIncumbentScope(
    Local<Context> backup_incumbent_context)
    : backup_incumbent_context_(backup_incumbent_context) {
  DCHECK(!backup_incumbent_context_.IsEmpty());

  i::Handle<i::Context> env = Utils::OpenHandle(*backup_incumbent_context_);
  i::Isolate* isolate = env->GetIsolate();

  js_stack_comparable_address_ =
      i::SimulatorStack::RegisterJSStackComparableAddress(isolate);

  prev_ = isolate->top_backup_incumbent_scope();
  isolate->set_top_backup_incumbent_scope(this);
}

Context::BackupIncumbentScope::~BackupIncumbentScope() {
  i::Handle<i::Context> env = Utils::OpenHandle(*backup_incumbent_context_);
  i::Isolate* isolate = env->GetIsolate();

  i::SimulatorStack::UnregisterJSStackComparableAddress(isolate);

  isolate->set_top_backup_incumbent_scope(prev_);
}

STATIC_ASSERT(i::Internals::kEmbedderDataSlotSize == i::kEmbedderDataSlotSize);

static i::Handle<i::EmbedderDataArray> EmbedderDataFor(Context* context,
                                                       int index, bool can_grow,
                                                       const char* location) {
  i::Handle<i::Context> env = Utils::OpenHandle(context);
  i::Isolate* isolate = env->GetIsolate();
  ASSERT_NO_SCRIPT_NO_EXCEPTION(isolate);
  bool ok = Utils::ApiCheck(env->IsNativeContext(), location,
                            "Not a native context") &&
            Utils::ApiCheck(index >= 0, location, "Negative index");
  if (!ok) return i::Handle<i::EmbedderDataArray>();
  // TODO(ishell): remove cast once embedder_data slot has a proper type.
  i::Handle<i::EmbedderDataArray> data(
      i::EmbedderDataArray::cast(env->embedder_data()), isolate);
  if (index < data->length()) return data;
  if (!Utils::ApiCheck(can_grow && index < i::EmbedderDataArray::kMaxLength,
                       location, "Index too large")) {
    return i::Handle<i::EmbedderDataArray>();
  }
  data = i::EmbedderDataArray::EnsureCapacity(isolate, data, index);
  env->set_embedder_data(*data);
  return data;
}

uint32_t Context::GetNumberOfEmbedderDataFields() {
  i::Handle<i::Context> context = Utils::OpenHandle(this);
  ASSERT_NO_SCRIPT_NO_EXCEPTION(context->GetIsolate());
  Utils::ApiCheck(context->IsNativeContext(),
                  "Context::GetNumberOfEmbedderDataFields",
                  "Not a native context");
  // TODO(ishell): remove cast once embedder_data slot has a proper type.
  return static_cast<uint32_t>(
      i::EmbedderDataArray::cast(context->embedder_data()).length());
}

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

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

void* Context::SlowGetAlignedPointerFromEmbedderData(int index) {
  const char* location = "v8::Context::GetAlignedPointerFromEmbedderData()";
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  i::HandleScope handle_scope(isolate);
  i::Handle<i::EmbedderDataArray> data =
      EmbedderDataFor(this, index, false, location);
  if (data.is_null()) return nullptr;
  void* result;
  Utils::ApiCheck(
      i::EmbedderDataSlot(*data, index).ToAlignedPointer(isolate, &result),
      location, "Pointer is not aligned");
  return result;
}

void Context::SetAlignedPointerInEmbedderData(int index, void* value) {
  const char* location = "v8::Context::SetAlignedPointerInEmbedderData()";
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  i::Handle<i::EmbedderDataArray> data =
      EmbedderDataFor(this, index, true, location);
  bool ok =
      i::EmbedderDataSlot(*data, index).store_aligned_pointer(isolate, value);
  Utils::ApiCheck(ok, location, "Pointer is not aligned");
  DCHECK_EQ(value, GetAlignedPointerFromEmbedderData(index));
}

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

static void InitializeTemplate(i::TemplateInfo that, int type,
                               bool do_not_cache) {
  that.set_number_of_properties(0);
  that.set_tag(type);
  int serial_number =
      do_not_cache ? i::TemplateInfo::kDoNotCache : i::TemplateInfo::kUncached;
  that.set_serial_number(serial_number);
}

void Template::Set(v8::Local<Name> name, v8::Local<Data> value,
                   v8::PropertyAttribute attribute) {
  auto templ = Utils::OpenHandle(this);
  i::Isolate* isolate = templ->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::HandleScope scope(isolate);
  auto value_obj = Utils::OpenHandle(*value);

  Utils::ApiCheck(!value_obj->IsJSReceiver() || value_obj->IsTemplateInfo(),
                  "v8::Template::Set",
                  "Invalid value, must be a primitive or a Template");

  // The template cache only performs shallow clones, if we set an
  // ObjectTemplate as a property value then we can not cache the receiver
  // template.
  if (value_obj->IsObjectTemplateInfo()) {
    templ->set_serial_number(i::TemplateInfo::kDoNotCache);
  }

  i::ApiNatives::AddDataProperty(isolate, templ, Utils::OpenHandle(*name),
                                 value_obj,
                                 static_cast<i::PropertyAttributes>(attribute));
}

void Template::SetPrivate(v8::Local<Private> name, v8::Local<Data> value,
                          v8::PropertyAttribute attribute) {
  Set(Utils::ToLocal(Utils::OpenHandle(reinterpret_cast<Name*>(*name))), value,
      attribute);
}

void Template::SetAccessorProperty(v8::Local<v8::Name> name,
                                   v8::Local<FunctionTemplate> getter,
                                   v8::Local<FunctionTemplate> setter,
                                   v8::PropertyAttribute attribute,
                                   v8::AccessControl access_control) {
  // TODO(verwaest): Remove |access_control|.
  DCHECK_EQ(v8::DEFAULT, access_control);
  auto templ = Utils::OpenHandle(this);
  auto isolate = templ->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  DCHECK(!name.IsEmpty());
  DCHECK(!getter.IsEmpty() || !setter.IsEmpty());
  i::HandleScope scope(isolate);
  i::ApiNatives::AddAccessorProperty(
      isolate, templ, Utils::OpenHandle(*name),
      Utils::OpenHandle(*getter, true), Utils::OpenHandle(*setter, true),
      static_cast<i::PropertyAttributes>(attribute));
}

// --- F u n c t i o n   T e m p l a t e ---
static void InitializeFunctionTemplate(i::FunctionTemplateInfo info,
                                       bool do_not_cache) {
  InitializeTemplate(info, Consts::FUNCTION_TEMPLATE, do_not_cache);
  info.set_flag(0);
}

static Local<ObjectTemplate> ObjectTemplateNew(
    i::Isolate* isolate, v8::Local<FunctionTemplate> constructor,
    bool do_not_cache);

Local<ObjectTemplate> FunctionTemplate::PrototypeTemplate() {
  auto self = Utils::OpenHandle(this);
  i::Isolate* i_isolate = self->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
  i::Handle<i::HeapObject> result(self->GetPrototypeTemplate(), i_isolate);
  if (result->IsUndefined(i_isolate)) {
    // Do not cache prototype objects.
    result = Utils::OpenHandle(
        *ObjectTemplateNew(i_isolate, Local<FunctionTemplate>(), true));
    i::FunctionTemplateInfo::SetPrototypeTemplate(i_isolate, self, result);
  }
  return ToApiHandle<ObjectTemplate>(result);
}

void FunctionTemplate::SetPrototypeProviderTemplate(
    Local<FunctionTemplate> prototype_provider) {
  auto self = Utils::OpenHandle(this);
  i::Isolate* i_isolate = self->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
  i::Handle<i::FunctionTemplateInfo> result =
      Utils::OpenHandle(*prototype_provider);
  Utils::ApiCheck(self->GetPrototypeTemplate().IsUndefined(i_isolate),
                  "v8::FunctionTemplate::SetPrototypeProviderTemplate",
                  "Protoype must be undefined");
  Utils::ApiCheck(self->GetParentTemplate().IsUndefined(i_isolate),
                  "v8::FunctionTemplate::SetPrototypeProviderTemplate",
                  "Prototype provider must be empty");
  i::FunctionTemplateInfo::SetPrototypeProviderTemplate(i_isolate, self,
                                                        result);
}

static void EnsureNotPublished(i::Handle<i::FunctionTemplateInfo> info,
                               const char* func) {
  DCHECK_IMPLIES(info->instantiated(), info->published());
  Utils::ApiCheck(!info->published(), func,
                  "FunctionTemplate already instantiated");
}

void FunctionTemplate::Inherit(v8::Local<FunctionTemplate> value) {
  auto info = Utils::OpenHandle(this);
  EnsureNotPublished(info, "v8::FunctionTemplate::Inherit");
  i::Isolate* i_isolate = info->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
  Utils::ApiCheck(info->GetPrototypeProviderTemplate().IsUndefined(i_isolate),
                  "v8::FunctionTemplate::Inherit",
                  "Protoype provider must be empty");
  i::FunctionTemplateInfo::SetParentTemplate(i_isolate, info,
                                             Utils::OpenHandle(*value));
}

static Local<FunctionTemplate> FunctionTemplateNew(
    i::Isolate* isolate, FunctionCallback callback, v8::Local<Value> data,
    v8::Local<Signature> signature, int length, ConstructorBehavior behavior,
    bool do_not_cache,
    v8::Local<Private> cached_property_name = v8::Local<Private>(),
    SideEffectType side_effect_type = SideEffectType::kHasSideEffect,
    const MemorySpan<const CFunction>& c_function_overloads = {},
    uint8_t instance_type = 0,
    uint8_t allowed_receiver_instance_type_range_start = 0,
    uint8_t allowed_receiver_instance_type_range_end = 0) {
  i::Handle<i::Struct> struct_obj = isolate->factory()->NewStruct(
      i::FUNCTION_TEMPLATE_INFO_TYPE, i::AllocationType::kOld);
  i::Handle<i::FunctionTemplateInfo> obj =
      i::Handle<i::FunctionTemplateInfo>::cast(struct_obj);
  {
    // Disallow GC until all fields of obj have acceptable types.
    i::DisallowGarbageCollection no_gc;
    i::FunctionTemplateInfo raw = *obj;
    InitializeFunctionTemplate(raw, do_not_cache);
    raw.set_length(length);
    raw.set_undetectable(false);
    raw.set_needs_access_check(false);
    raw.set_accept_any_receiver(true);
    if (!signature.IsEmpty()) {
      raw.set_signature(*Utils::OpenHandle(*signature));
    }
    raw.set_cached_property_name(
        cached_property_name.IsEmpty()
            ? i::ReadOnlyRoots(isolate).the_hole_value()
            : *Utils::OpenHandle(*cached_property_name));
    if (behavior == ConstructorBehavior::kThrow) raw.set_remove_prototype(true);
    raw.SetInstanceType(instance_type);
    raw.set_allowed_receiver_instance_type_range_start(
        allowed_receiver_instance_type_range_start);
    raw.set_allowed_receiver_instance_type_range_end(
        allowed_receiver_instance_type_range_end);
  }
  if (callback != nullptr) {
    Utils::ToLocal(obj)->SetCallHandler(callback, data, side_effect_type,
                                        c_function_overloads);
  }
  return Utils::ToLocal(obj);
}

Local<FunctionTemplate> FunctionTemplate::New(
    Isolate* isolate, FunctionCallback callback, v8::Local<Value> data,
    v8::Local<Signature> signature, int length, ConstructorBehavior behavior,
    SideEffectType side_effect_type, const CFunction* c_function,
    uint16_t instance_type, uint16_t allowed_receiver_instance_type_range_start,
    uint16_t allowed_receiver_instance_type_range_end) {
  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
  // Changes to the environment cannot be captured in the snapshot. Expect no
  // function templates when the isolate is created for serialization.
  LOG_API(i_isolate, FunctionTemplate, New);

  if (!Utils::ApiCheck(
          !c_function || behavior == ConstructorBehavior::kThrow,
          "FunctionTemplate::New",
          "Fast API calls are not supported for constructor functions.")) {
    return Local<FunctionTemplate>();
  }

  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
  return FunctionTemplateNew(
      i_isolate, callback, data, signature, length, behavior, false,
      Local<Private>(), side_effect_type,
      c_function ? MemorySpan<const CFunction>{c_function, 1}
                 : MemorySpan<const CFunction>{},
      instance_type, allowed_receiver_instance_type_range_start,
      allowed_receiver_instance_type_range_end);
}

Local<FunctionTemplate> FunctionTemplate::NewWithCFunctionOverloads(
    Isolate* isolate, FunctionCallback callback, v8::Local<Value> data,
    v8::Local<Signature> signature, int length, ConstructorBehavior behavior,
    SideEffectType side_effect_type,
    const MemorySpan<const CFunction>& c_function_overloads) {
  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
  LOG_API(i_isolate, FunctionTemplate, New);

  if (!Utils::ApiCheck(
          c_function_overloads.size() == 0 ||
              behavior == ConstructorBehavior::kThrow,
          "FunctionTemplate::NewWithCFunctionOverloads",
          "Fast API calls are not supported for constructor functions.")) {
    return Local<FunctionTemplate>();
  }

  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
  return FunctionTemplateNew(i_isolate, callback, data, signature, length,
                             behavior, false, Local<Private>(),
                             side_effect_type, c_function_overloads);
}

Local<FunctionTemplate> FunctionTemplate::NewWithCache(
    Isolate* isolate, FunctionCallback callback, Local<Private> cache_property,
    Local<Value> data, Local<Signature> signature, int length,
    SideEffectType side_effect_type) {
  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
  LOG_API(i_isolate, FunctionTemplate, NewWithCache);
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
  return FunctionTemplateNew(i_isolate, callback, data, signature, length,
                             ConstructorBehavior::kAllow, false, cache_property,
                             side_effect_type);
}

Local<Signature> Signature::New(Isolate* isolate,
                                Local<FunctionTemplate> receiver) {
  return Utils::SignatureToLocal(Utils::OpenHandle(*receiver));
}

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

#define SET_FIELD_WRAPPED(isolate, obj, setter, cdata)        \
  do {                                                        \
    i::Handle<i::Object> foreign = FromCData(isolate, cdata); \
    (obj)->setter(*foreign);                                  \
  } while (false)

void FunctionTemplate::SetCallHandler(
    FunctionCallback callback, v8::Local<Value> data,
    SideEffectType side_effect_type,
    const MemorySpan<const CFunction>& c_function_overloads) {
  auto info = Utils::OpenHandle(this);
  EnsureNotPublished(info, "v8::FunctionTemplate::SetCallHandler");
  i::Isolate* isolate = info->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::CallHandlerInfo> obj = isolate->factory()->NewCallHandlerInfo(
      side_effect_type == SideEffectType::kHasNoSideEffect);
  SET_FIELD_WRAPPED(isolate, obj, set_callback, callback);
  SET_FIELD_WRAPPED(isolate, obj, set_js_callback, obj->redirected_callback());
  if (data.IsEmpty()) {
    data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
  }
  obj->set_data(*Utils::OpenHandle(*data));
  if (c_function_overloads.size() > 0) {
    // Stores the data for a sequence of CFunction overloads into a single
    // FixedArray, as [address_0, signature_0, ... address_n-1, signature_n-1].
    i::Handle<i::FixedArray> function_overloads =
        isolate->factory()->NewFixedArray(static_cast<int>(
            c_function_overloads.size() *
            i::FunctionTemplateInfo::kFunctionOverloadEntrySize));
    int function_count = static_cast<int>(c_function_overloads.size());
    for (int i = 0; i < function_count; i++) {
      const CFunction& c_function = c_function_overloads.data()[i];
      i::Handle<i::Object> address =
          FromCData(isolate, c_function.GetAddress());
      function_overloads->set(
          i::FunctionTemplateInfo::kFunctionOverloadEntrySize * i, *address);
      i::Handle<i::Object> signature =
          FromCData(isolate, c_function.GetTypeInfo());
      function_overloads->set(
          i::FunctionTemplateInfo::kFunctionOverloadEntrySize * i + 1,
          *signature);
    }
    i::FunctionTemplateInfo::SetCFunctionOverloads(isolate, info,
                                                   function_overloads);
  }
  info->set_call_code(*obj, kReleaseStore);
}

namespace {

template <typename Getter, typename Setter>
i::Handle<i::AccessorInfo> MakeAccessorInfo(
    i::Isolate* isolate, v8::Local<Name> name, Getter getter, Setter setter,
    v8::Local<Value> data, v8::AccessControl settings,
    v8::Local<AccessorSignature> signature, bool is_special_data_property,
    bool replace_on_access) {
  i::Handle<i::AccessorInfo> obj = isolate->factory()->NewAccessorInfo();
  SET_FIELD_WRAPPED(isolate, obj, set_getter, getter);
  DCHECK_IMPLIES(replace_on_access,
                 is_special_data_property && setter == nullptr);
  if (is_special_data_property && setter == nullptr) {
    setter = reinterpret_cast<Setter>(&i::Accessors::ReconfigureToDataProperty);
  }
  SET_FIELD_WRAPPED(isolate, obj, set_setter, setter);
  i::Address redirected = obj->redirected_getter();
  if (redirected != i::kNullAddress) {
    SET_FIELD_WRAPPED(isolate, obj, set_js_getter, redirected);
  }

  i::Handle<i::Name> accessor_name = Utils::OpenHandle(*name);
  if (!accessor_name->IsUniqueName()) {
    accessor_name = isolate->factory()->InternalizeString(
        i::Handle<i::String>::cast(accessor_name));
  }
  i::DisallowGarbageCollection no_gc;
  i::AccessorInfo raw_obj = *obj;
  if (data.IsEmpty()) {
    raw_obj.set_data(i::ReadOnlyRoots(isolate).undefined_value());
  } else {
    raw_obj.set_data(*Utils::OpenHandle(*data));
  }
  raw_obj.set_name(*accessor_name);
  raw_obj.set_is_special_data_property(is_special_data_property);
  raw_obj.set_replace_on_access(replace_on_access);
  if (settings & ALL_CAN_READ) raw_obj.set_all_can_read(true);
  if (settings & ALL_CAN_WRITE) raw_obj.set_all_can_write(true);
  raw_obj.set_initial_property_attributes(i::NONE);
  if (!signature.IsEmpty()) {
    raw_obj.set_expected_receiver_type(*Utils::OpenHandle(*signature));
  }
  return obj;
}

}  // namespace

Local<ObjectTemplate> FunctionTemplate::InstanceTemplate() {
  i::Handle<i::FunctionTemplateInfo> handle = Utils::OpenHandle(this, true);
  if (!Utils::ApiCheck(!handle.is_null(),
                       "v8::FunctionTemplate::InstanceTemplate()",
                       "Reading from empty handle")) {
    return Local<ObjectTemplate>();
  }
  i::Isolate* isolate = handle->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  if (handle->GetInstanceTemplate().IsUndefined(isolate)) {
    Local<ObjectTemplate> templ =
        ObjectTemplate::New(isolate, ToApiHandle<FunctionTemplate>(handle));
    i::FunctionTemplateInfo::SetInstanceTemplate(isolate, handle,
                                                 Utils::OpenHandle(*templ));
  }
  i::Handle<i::ObjectTemplateInfo> result(
      i::ObjectTemplateInfo::cast(handle->GetInstanceTemplate()), isolate);
  return Utils::ToLocal(result);
}

void FunctionTemplate::SetLength(int length) {
  auto info = Utils::OpenHandle(this);
  EnsureNotPublished(info, "v8::FunctionTemplate::SetLength");
  auto isolate = info->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  info->set_length(length);
}

void FunctionTemplate::SetClassName(Local<String> name) {
  auto info = Utils::OpenHandle(this);
  EnsureNotPublished(info, "v8::FunctionTemplate::SetClassName");
  auto isolate = info->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  info->set_class_name(*Utils::OpenHandle(*name));
}

void FunctionTemplate::SetAcceptAnyReceiver(bool value) {
  auto info = Utils::OpenHandle(this);
  EnsureNotPublished(info, "v8::FunctionTemplate::SetAcceptAnyReceiver");
  auto isolate = info->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  info->set_accept_any_receiver(value);
}

void FunctionTemplate::ReadOnlyPrototype() {
  auto info = Utils::OpenHandle(this);
  EnsureNotPublished(info, "v8::FunctionTemplate::ReadOnlyPrototype");
  auto isolate = info->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  info->set_read_only_prototype(true);
}

void FunctionTemplate::RemovePrototype() {
  auto info = Utils::OpenHandle(this);
  EnsureNotPublished(info, "v8::FunctionTemplate::RemovePrototype");
  auto isolate = info->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  info->set_remove_prototype(true);
}

// --- O b j e c t T e m p l a t e ---

Local<ObjectTemplate> ObjectTemplate::New(
    Isolate* isolate, v8::Local<FunctionTemplate> constructor) {
  return New(reinterpret_cast<i::Isolate*>(isolate), constructor);
}

static Local<ObjectTemplate> ObjectTemplateNew(
    i::Isolate* isolate, v8::Local<FunctionTemplate> constructor,
    bool do_not_cache) {
  LOG_API(isolate, ObjectTemplate, New);
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::Handle<i::Struct> struct_obj = isolate->factory()->NewStruct(
      i::OBJECT_TEMPLATE_INFO_TYPE, i::AllocationType::kOld);
  i::Handle<i::ObjectTemplateInfo> obj =
      i::Handle<i::ObjectTemplateInfo>::cast(struct_obj);
  {
    // Disallow GC until all fields of obj have acceptable types.
    i::DisallowGarbageCollection no_gc;
    i::ObjectTemplateInfo raw = *obj;
    InitializeTemplate(raw, Consts::OBJECT_TEMPLATE, do_not_cache);
    raw.set_data(0);
    if (!constructor.IsEmpty()) {
      raw.set_constructor(*Utils::OpenHandle(*constructor));
    }
  }
  return Utils::ToLocal(obj);
}

Local<ObjectTemplate> ObjectTemplate::New(
    i::Isolate* isolate, v8::Local<FunctionTemplate> constructor) {
  return ObjectTemplateNew(isolate, constructor, false);
}

// 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(isolate)) {
    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);
  i::FunctionTemplateInfo::SetInstanceTemplate(
      isolate, constructor, Utils::OpenHandle(object_template));
  Utils::OpenHandle(object_template)->set_constructor(*constructor);
  return constructor;
}

template <typename Getter, typename Setter, typename Data, typename Template>
static void TemplateSetAccessor(
    Template* template_obj, v8::Local<Name> name, Getter getter, Setter setter,
    Data data, AccessControl settings, PropertyAttribute attribute,
    v8::Local<AccessorSignature> signature, bool is_special_data_property,
    bool replace_on_access, SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type) {
  auto info = Utils::OpenHandle(template_obj);
  auto isolate = info->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::HandleScope scope(isolate);
  i::Handle<i::AccessorInfo> accessor_info =
      MakeAccessorInfo(isolate, name, getter, setter, data, settings, signature,
                       is_special_data_property, replace_on_access);
  {
    i::DisallowGarbageCollection no_gc;
    i::AccessorInfo raw = *accessor_info;
    raw.set_initial_property_attributes(
        static_cast<i::PropertyAttributes>(attribute));
    raw.set_getter_side_effect_type(getter_side_effect_type);
    raw.set_setter_side_effect_type(setter_side_effect_type);
  }
  i::ApiNatives::AddNativeDataProperty(isolate, info, accessor_info);
}

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

void Template::SetNativeDataProperty(
    v8::Local<Name> name, AccessorNameGetterCallback getter,
    AccessorNameSetterCallback setter, v8::Local<Value> data,
    PropertyAttribute attribute, v8::Local<AccessorSignature> signature,
    AccessControl settings, SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type) {
  TemplateSetAccessor(this, name, getter, setter, data, settings, attribute,
                      signature, true, false, getter_side_effect_type,
                      setter_side_effect_type);
}

void Template::SetLazyDataProperty(v8::Local<Name> name,
                                   AccessorNameGetterCallback getter,
                                   v8::Local<Value> data,
                                   PropertyAttribute attribute,
                                   SideEffectType getter_side_effect_type,
                                   SideEffectType setter_side_effect_type) {
  TemplateSetAccessor(this, name, getter,
                      static_cast<AccessorNameSetterCallback>(nullptr), data,
                      DEFAULT, attribute, Local<AccessorSignature>(), true,
                      true, getter_side_effect_type, setter_side_effect_type);
}

void Template::SetIntrinsicDataProperty(Local<Name> name, Intrinsic intrinsic,
                                        PropertyAttribute attribute) {
  auto templ = Utils::OpenHandle(this);
  i::Isolate* isolate = templ->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::HandleScope scope(isolate);
  i::ApiNatives::AddDataProperty(isolate, templ, Utils::OpenHandle(*name),
                                 intrinsic,
                                 static_cast<i::PropertyAttributes>(attribute));
}

void ObjectTemplate::SetAccessor(v8::Local<String> name,
                                 AccessorGetterCallback getter,
                                 AccessorSetterCallback setter,
                                 v8::Local<Value> data, AccessControl settings,
                                 PropertyAttribute attribute,
                                 v8::Local<AccessorSignature> signature,
                                 SideEffectType getter_side_effect_type,
                                 SideEffectType setter_side_effect_type) {
  TemplateSetAccessor(this, name, getter, setter, data, settings, attribute,
                      signature, i::FLAG_disable_old_api_accessors, false,
                      getter_side_effect_type, setter_side_effect_type);
}

void ObjectTemplate::SetAccessor(v8::Local<Name> name,
                                 AccessorNameGetterCallback getter,
                                 AccessorNameSetterCallback setter,
                                 v8::Local<Value> data, AccessControl settings,
                                 PropertyAttribute attribute,
                                 v8::Local<AccessorSignature> signature,
                                 SideEffectType getter_side_effect_type,
                                 SideEffectType setter_side_effect_type) {
  TemplateSetAccessor(this, name, getter, setter, data, settings, attribute,
                      signature, i::FLAG_disable_old_api_accessors, false,
                      getter_side_effect_type, setter_side_effect_type);
}

template <typename Getter, typename Setter, typename Query, typename Descriptor,
          typename Deleter, typename Enumerator, typename Definer>
static i::Handle<i::InterceptorInfo> CreateInterceptorInfo(
    i::Isolate* isolate, Getter getter, Setter setter, Query query,
    Descriptor descriptor, Deleter remover, Enumerator enumerator,
    Definer definer, Local<Value> data, PropertyHandlerFlags flags) {
  auto obj = i::Handle<i::InterceptorInfo>::cast(isolate->factory()->NewStruct(
      i::INTERCEPTOR_INFO_TYPE, i::AllocationType::kOld));
  obj->set_flags(0);

  if (getter != nullptr) SET_FIELD_WRAPPED(isolate, obj, set_getter, getter);
  if (setter != nullptr) SET_FIELD_WRAPPED(isolate, obj, set_setter, setter);
  if (query != nullptr) SET_FIELD_WRAPPED(isolate, obj, set_query, query);
  if (descriptor != nullptr)
    SET_FIELD_WRAPPED(isolate, obj, set_descriptor, descriptor);
  if (remover != nullptr) SET_FIELD_WRAPPED(isolate, obj, set_deleter, remover);
  if (enumerator != nullptr)
    SET_FIELD_WRAPPED(isolate, obj, set_enumerator, enumerator);
  if (definer != nullptr) SET_FIELD_WRAPPED(isolate, obj, set_definer, definer);
  obj->set_can_intercept_symbols(
      !(static_cast<int>(flags) &
        static_cast<int>(PropertyHandlerFlags::kOnlyInterceptStrings)));
  obj->set_all_can_read(static_cast<int>(flags) &
                        static_cast<int>(PropertyHandlerFlags::kAllCanRead));
  obj->set_non_masking(static_cast<int>(flags) &
                       static_cast<int>(PropertyHandlerFlags::kNonMasking));
  obj->set_has_no_side_effect(
      static_cast<int>(flags) &
      static_cast<int>(PropertyHandlerFlags::kHasNoSideEffect));

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

template <typename Getter, typename Setter, typename Query, typename Descriptor,
          typename Deleter, typename Enumerator, typename Definer>
static i::Handle<i::InterceptorInfo> CreateNamedInterceptorInfo(
    i::Isolate* isolate, Getter getter, Setter setter, Query query,
    Descriptor descriptor, Deleter remover, Enumerator enumerator,
    Definer definer, Local<Value> data, PropertyHandlerFlags flags) {
  auto interceptor =
      CreateInterceptorInfo(isolate, getter, setter, query, descriptor, remover,
                            enumerator, definer, data, flags);
  interceptor->set_is_named(true);
  return interceptor;
}

template <typename Getter, typename Setter, typename Query, typename Descriptor,
          typename Deleter, typename Enumerator, typename Definer>
static i::Handle<i::InterceptorInfo> CreateIndexedInterceptorInfo(
    i::Isolate* isolate, Getter getter, Setter setter, Query query,
    Descriptor descriptor, Deleter remover, Enumerator enumerator,
    Definer definer, Local<Value> data, PropertyHandlerFlags flags) {
  auto interceptor =
      CreateInterceptorInfo(isolate, getter, setter, query, descriptor, remover,
                            enumerator, definer, data, flags);
  interceptor->set_is_named(false);
  return interceptor;
}

template <typename Getter, typename Setter, typename Query, typename Descriptor,
          typename Deleter, typename Enumerator, typename Definer>
static void ObjectTemplateSetNamedPropertyHandler(
    ObjectTemplate* templ, Getter getter, Setter setter, Query query,
    Descriptor descriptor, Deleter remover, Enumerator enumerator,
    Definer definer, Local<Value> data, PropertyHandlerFlags flags) {
  i::Isolate* isolate = Utils::OpenHandle(templ)->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::HandleScope scope(isolate);
  auto cons = EnsureConstructor(isolate, templ);
  EnsureNotPublished(cons, "ObjectTemplateSetNamedPropertyHandler");
  auto obj =
      CreateNamedInterceptorInfo(isolate, getter, setter, query, descriptor,
                                 remover, enumerator, definer, data, flags);
  i::FunctionTemplateInfo::SetNamedPropertyHandler(isolate, cons, obj);
}

void ObjectTemplate::SetHandler(
    const NamedPropertyHandlerConfiguration& config) {
  ObjectTemplateSetNamedPropertyHandler(
      this, config.getter, config.setter, config.query, config.descriptor,
      config.deleter, config.enumerator, config.definer, config.data,
      config.flags);
}

void ObjectTemplate::MarkAsUndetectable() {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::HandleScope scope(isolate);
  auto cons = EnsureConstructor(isolate, this);
  EnsureNotPublished(cons, "v8::ObjectTemplate::MarkAsUndetectable");
  cons->set_undetectable(true);
}

void ObjectTemplate::SetAccessCheckCallback(AccessCheckCallback callback,
                                            Local<Value> data) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::HandleScope scope(isolate);
  auto cons = EnsureConstructor(isolate, this);
  EnsureNotPublished(cons, "v8::ObjectTemplate::SetAccessCheckCallback");

  i::Handle<i::Struct> struct_info = isolate->factory()->NewStruct(
      i::ACCESS_CHECK_INFO_TYPE, i::AllocationType::kOld);
  i::Handle<i::AccessCheckInfo> info =
      i::Handle<i::AccessCheckInfo>::cast(struct_info);

  SET_FIELD_WRAPPED(isolate, info, set_callback, callback);
  info->set_named_interceptor(i::Object());
  info->set_indexed_interceptor(i::Object());

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

  i::FunctionTemplateInfo::SetAccessCheckInfo(isolate, cons, info);
  cons->set_needs_access_check(true);
}

void ObjectTemplate::SetAccessCheckCallbackAndHandler(
    AccessCheckCallback callback,
    const NamedPropertyHandlerConfiguration& named_handler,
    const IndexedPropertyHandlerConfiguration& indexed_handler,
    Local<Value> data) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::HandleScope scope(isolate);
  auto cons = EnsureConstructor(isolate, this);
  EnsureNotPublished(cons,
                     "v8::ObjectTemplate::SetAccessCheckCallbackWithHandler");

  i::Handle<i::Struct> struct_info = isolate->factory()->NewStruct(
      i::ACCESS_CHECK_INFO_TYPE, i::AllocationType::kOld);
  i::Handle<i::AccessCheckInfo> info =
      i::Handle<i::AccessCheckInfo>::cast(struct_info);

  SET_FIELD_WRAPPED(isolate, info, set_callback, callback);
  auto named_interceptor = CreateNamedInterceptorInfo(
      isolate, named_handler.getter, named_handler.setter, named_handler.query,
      named_handler.descriptor, named_handler.deleter, named_handler.enumerator,
      named_handler.definer, named_handler.data, named_handler.flags);
  info->set_named_interceptor(*named_interceptor);
  auto indexed_interceptor = CreateIndexedInterceptorInfo(
      isolate, indexed_handler.getter, indexed_handler.setter,
      indexed_handler.query, indexed_handler.descriptor,
      indexed_handler.deleter, indexed_handler.enumerator,
      indexed_handler.definer, indexed_handler.data, indexed_handler.flags);
  info->set_indexed_interceptor(*indexed_interceptor);

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

  i::FunctionTemplateInfo::SetAccessCheckInfo(isolate, cons, info);
  cons->set_needs_access_check(true);
}

void ObjectTemplate::SetHandler(
    const IndexedPropertyHandlerConfiguration& config) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::HandleScope scope(isolate);
  auto cons = EnsureConstructor(isolate, this);
  EnsureNotPublished(cons, "v8::ObjectTemplate::SetHandler");
  auto obj = CreateIndexedInterceptorInfo(
      isolate, config.getter, config.setter, config.query, config.descriptor,
      config.deleter, config.enumerator, config.definer, config.data,
      config.flags);
  i::FunctionTemplateInfo::SetIndexedPropertyHandler(isolate, cons, obj);
}

void ObjectTemplate::SetCallAsFunctionHandler(FunctionCallback callback,
                                              Local<Value> data) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::HandleScope scope(isolate);
  auto cons = EnsureConstructor(isolate, this);
  EnsureNotPublished(cons, "v8::ObjectTemplate::SetCallAsFunctionHandler");
  i::Handle<i::CallHandlerInfo> obj = isolate->factory()->NewCallHandlerInfo();
  SET_FIELD_WRAPPED(isolate, obj, set_callback, callback);
  SET_FIELD_WRAPPED(isolate, obj, set_js_callback, obj->redirected_callback());
  if (data.IsEmpty()) {
    data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
  }
  obj->set_data(*Utils::OpenHandle(*data));
  i::FunctionTemplateInfo::SetInstanceCallHandler(isolate, cons, obj);
}

int ObjectTemplate::InternalFieldCount() const {
  return Utils::OpenHandle(this)->embedder_field_count();
}

void ObjectTemplate::SetInternalFieldCount(int value) {
  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
  if (!Utils::ApiCheck(i::Smi::IsValid(value),
                       "v8::ObjectTemplate::SetInternalFieldCount()",
                       "Invalid embedder field count")) {
    return;
  }
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  if (value > 0) {
    // The embedder 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_embedder_field_count(value);
}

bool ObjectTemplate::IsImmutableProto() const {
  return Utils::OpenHandle(this)->immutable_proto();
}

void ObjectTemplate::SetImmutableProto() {
  auto self = Utils::OpenHandle(this);
  i::Isolate* isolate = self->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  self->set_immutable_proto(true);
}

bool ObjectTemplate::IsCodeLike() const {
  return Utils::OpenHandle(this)->code_like();
}

void ObjectTemplate::SetCodeLike() {
  auto self = Utils::OpenHandle(this);
  i::Isolate* isolate = self->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  self->set_code_like(true);
}

// --- 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_),
      rejected(false),
      buffer_policy(buffer_policy_) {}

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

ScriptCompiler::StreamedSource::StreamedSource(
    std::unique_ptr<ExternalSourceStream> stream, Encoding encoding)
    : impl_(new i::ScriptStreamingData(std::move(stream), encoding)) {}

ScriptCompiler::StreamedSource::~StreamedSource() = default;

Local<Script> UnboundScript::BindToCurrentContext() {
  auto function_info =
      i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
  i::Isolate* isolate = function_info->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::Handle<i::JSFunction> function =
      i::Factory::JSFunctionBuilder{isolate, function_info,
                                    isolate->native_context()}
          .Build();
  return ToApiHandle<Script>(function);
}

int UnboundScript::GetId() const {
  auto function_info = i::SharedFunctionInfo::cast(*Utils::OpenHandle(this));
  i::Isolate* isolate = function_info.GetIsolate();
  LOG_API(isolate, UnboundScript, GetId);
  return i::Script::cast(function_info.script()).id();
}

int UnboundScript::GetLineNumber(int code_pos) {
  i::Handle<i::SharedFunctionInfo> obj =
      i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
  i::Isolate* isolate = obj->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  LOG_API(isolate, UnboundScript, GetLineNumber);
  if (obj->script().IsScript()) {
    i::Handle<i::Script> script(i::Script::cast(obj->script()), isolate);
    return i::Script::GetLineNumber(script, code_pos);
  } else {
    return -1;
  }
}

Local<Value> UnboundScript::GetScriptName() {
  i::Handle<i::SharedFunctionInfo> obj =
      i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
  i::Isolate* isolate = obj->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  LOG_API(isolate, UnboundScript, GetName);
  if (obj->script().IsScript()) {
    i::Object name = i::Script::cast(obj->script()).name();
    return Utils::ToLocal(i::Handle<i::Object>(name, isolate));
  } else {
    return Local<String>();
  }
}

Local<Value> UnboundScript::GetSourceURL() {
  i::Handle<i::SharedFunctionInfo> obj =
      i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
  i::Isolate* isolate = obj->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  LOG_API(isolate, UnboundScript, GetSourceURL);
  if (obj->script().IsScript()) {
    i::Object url = i::Script::cast(obj->script()).source_url();
    return Utils::ToLocal(i::Handle<i::Object>(url, isolate));
  } else {
    return Local<String>();
  }
}

Local<Value> UnboundScript::GetSourceMappingURL() {
  i::Handle<i::SharedFunctionInfo> obj =
      i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
  i::Isolate* isolate = obj->GetIsolate();
  LOG_API(isolate, UnboundScript, GetSourceMappingURL);
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  if (obj->script().IsScript()) {
    i::Object url = i::Script::cast(obj->script()).source_mapping_url();
    return Utils::ToLocal(i::Handle<i::Object>(url, isolate));
  } else {
    return Local<String>();
  }
}

MaybeLocal<Value> Script::Run(Local<Context> context) {
  return Run(context, Local<Data>());
}

MaybeLocal<Value> Script::Run(Local<Context> context,
                              Local<Data> host_defined_options) {
  auto v8_isolate = context->GetIsolate();
  auto isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.Execute");
  ENTER_V8(isolate, context, Script, Run, MaybeLocal<Value>(),
           InternalEscapableScope);
  i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
  i::NestedTimedHistogramScope execute_timer(isolate->counters()->execute(),
                                             isolate);
  i::AggregatingHistogramTimerScope histogram_timer(
      isolate->counters()->compile_lazy());
  auto fun = i::Handle<i::JSFunction>::cast(Utils::OpenHandle(this));

  // TODO(crbug.com/1193459): remove once ablation study is completed
  base::ElapsedTimer timer;
  base::TimeDelta delta;
  if (i::FLAG_script_delay > 0) {
    delta = v8::base::TimeDelta::FromMillisecondsD(i::FLAG_script_delay);
  }
  if (i::FLAG_script_delay_once > 0 && !isolate->did_run_script_delay()) {
    delta = v8::base::TimeDelta::FromMillisecondsD(i::FLAG_script_delay_once);
    isolate->set_did_run_script_delay(true);
  }
  if (i::FLAG_script_delay_fraction > 0.0) {
    timer.Start();
  } else if (delta.InMicroseconds() > 0) {
    timer.Start();
    while (timer.Elapsed() < delta) {
      // Busy wait.
    }
  }

  if (V8_UNLIKELY(i::FLAG_experimental_web_snapshots)) {
    i::Handle<i::HeapObject> maybe_script =
        handle(fun->shared().script(), isolate);
    if (maybe_script->IsScript() &&
        i::Script::cast(*maybe_script).type() == i::Script::TYPE_WEB_SNAPSHOT) {
      i::WebSnapshotDeserializer deserializer(
          reinterpret_cast<i::Isolate*>(v8_isolate),
          i::Handle<i::Script>::cast(maybe_script));
      deserializer.Deserialize();
      RETURN_ON_FAILED_EXECUTION(Value);
      Local<Value> result = v8::Undefined(v8_isolate);
      RETURN_ESCAPED(result);
    }
  }

  i::Handle<i::Object> receiver = isolate->global_proxy();
  // TODO(cbruni, chromium:1244145): Remove once migrated to the context.
  i::Handle<i::Object> options(
      i::Script::cast(fun->shared().script()).host_defined_options(), isolate);
  Local<Value> result;
  has_pending_exception = !ToLocal<Value>(
      i::Execution::CallScript(isolate, fun, receiver, options), &result);

  if (i::FLAG_script_delay_fraction > 0.0) {
    delta = v8::base::TimeDelta::FromMillisecondsD(
        timer.Elapsed().InMillisecondsF() * i::FLAG_script_delay_fraction);
    timer.Restart();
    while (timer.Elapsed() < delta) {
      // Busy wait.
    }
  }

  RETURN_ON_FAILED_EXECUTION(Value);
  RETURN_ESCAPED(result);
}

Local<Value> ScriptOrModule::GetResourceName() {
  i::Handle<i::ScriptOrModule> obj = Utils::OpenHandle(this);
  i::Isolate* isolate = i::GetIsolateFromWritableObject(*obj);
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::Handle<i::Object> val(obj->resource_name(), isolate);
  return ToApiHandle<Value>(val);
}

Local<PrimitiveArray> ScriptOrModule::GetHostDefinedOptions() {
  return HostDefinedOptions().As<PrimitiveArray>();
}

Local<Data> ScriptOrModule::HostDefinedOptions() {
  i::Handle<i::ScriptOrModule> obj = Utils::OpenHandle(this);
  i::Isolate* isolate = i::GetIsolateFromWritableObject(*obj);
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::Handle<i::Object> val(obj->host_defined_options(), isolate);
  return ToApiHandle<Data>(val);
}

Local<UnboundScript> Script::GetUnboundScript() {
  i::DisallowGarbageCollection no_gc;
  i::Handle<i::JSFunction> obj = Utils::OpenHandle(this);
  i::SharedFunctionInfo sfi = (*obj).shared();
  i::Isolate* isolate = sfi.GetIsolate();
  return ToApiHandle<UnboundScript>(i::handle(sfi, isolate));
}

Local<Value> Script::GetResourceName() {
  i::DisallowGarbageCollection no_gc;
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  i::SharedFunctionInfo sfi = (*func).shared();
  i::Isolate* isolate = func->GetIsolate();
  CHECK(sfi.script().IsScript());
  return ToApiHandle<Value>(
      i::handle(i::Script::cast(sfi.script()).name(), isolate));
}

// static
Local<PrimitiveArray> PrimitiveArray::New(Isolate* v8_isolate, int length) {
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  Utils::ApiCheck(length >= 0, "v8::PrimitiveArray::New",
                  "length must be equal or greater than zero");
  i::Handle<i::FixedArray> array = isolate->factory()->NewFixedArray(length);
  return ToApiHandle<PrimitiveArray>(array);
}

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

void PrimitiveArray::Set(Isolate* v8_isolate, int index,
                         Local<Primitive> item) {
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  i::Handle<i::FixedArray> array = Utils::OpenHandle(this);
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  Utils::ApiCheck(index >= 0 && index < array->length(),
                  "v8::PrimitiveArray::Set",
                  "index must be greater than or equal to 0 and less than the "
                  "array length");
  i::Handle<i::Object> i_item = Utils::OpenHandle(*item);
  array->set(index, *i_item);
}

Local<Primitive> PrimitiveArray::Get(Isolate* v8_isolate, int index) {
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  i::Handle<i::FixedArray> array = Utils::OpenHandle(this);
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  Utils::ApiCheck(index >= 0 && index < array->length(),
                  "v8::PrimitiveArray::Get",
                  "index must be greater than or equal to 0 and less than the "
                  "array length");
  i::Handle<i::Object> i_item(array->get(index), isolate);
  return ToApiHandle<Primitive>(i_item);
}

void v8::PrimitiveArray::CheckCast(v8::Data* that) {
  i::Handle<i::Object> obj = Utils::OpenHandle(that);
  Utils::ApiCheck(
      obj->IsFixedArray(), "v8::PrimitiveArray::Cast",
      "Value is not a PrimitiveArray. This is a temporary issue, v8::Data and "
      "v8::PrimitiveArray will not be compatible in the future.");
}

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

Local<Data> FixedArray::Get(Local<Context> context, int i) const {
  i::Handle<i::FixedArray> self = Utils::OpenHandle(this);
  auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
  CHECK_LT(i, self->length());
  i::Handle<i::Object> entry(self->get(i), isolate);
  return ToApiHandle<Data>(entry);
}

Local<String> ModuleRequest::GetSpecifier() const {
  i::Handle<i::ModuleRequest> self = Utils::OpenHandle(this);
  i::Isolate* isolate = self->GetIsolate();
  return ToApiHandle<String>(i::handle(self->specifier(), isolate));
}

int ModuleRequest::GetSourceOffset() const {
  return Utils::OpenHandle(this)->position();
}

Local<FixedArray> ModuleRequest::GetImportAssertions() const {
  i::Handle<i::ModuleRequest> self = Utils::OpenHandle(this);
  i::Isolate* isolate = self->GetIsolate();
  return ToApiHandle<FixedArray>(i::handle(self->import_assertions(), isolate));
}

Module::Status Module::GetStatus() const {
  i::Handle<i::Module> self = Utils::OpenHandle(this);
  switch (self->status()) {
    case i::Module::kUnlinked:
    case i::Module::kPreLinking:
      return kUninstantiated;
    case i::Module::kLinking:
      return kInstantiating;
    case i::Module::kLinked:
      return kInstantiated;
    case i::Module::kEvaluating:
    case i::Module::kEvaluatingAsync:
      return kEvaluating;
    case i::Module::kEvaluated:
      return kEvaluated;
    case i::Module::kErrored:
      return kErrored;
  }
  UNREACHABLE();
}

Local<Value> Module::GetException() const {
  Utils::ApiCheck(GetStatus() == kErrored, "v8::Module::GetException",
                  "Module status must be kErrored");
  i::Handle<i::Module> self = Utils::OpenHandle(this);
  i::Isolate* isolate = self->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  return ToApiHandle<Value>(i::handle(self->GetException(), isolate));
}

Local<FixedArray> Module::GetModuleRequests() const {
  i::Handle<i::Module> self = Utils::OpenHandle(this);
  if (self->IsSyntheticModule()) {
    // Synthetic modules are leaf nodes in the module graph. They have no
    // ModuleRequests.
    return ToApiHandle<FixedArray>(
        self->GetReadOnlyRoots().empty_fixed_array_handle());
  } else {
    i::Isolate* isolate = self->GetIsolate();
    i::Handle<i::FixedArray> module_requests(
        i::Handle<i::SourceTextModule>::cast(self)->info().module_requests(),
        isolate);
    return ToApiHandle<FixedArray>(module_requests);
  }
}

Location Module::SourceOffsetToLocation(int offset) const {
  i::Handle<i::Module> self = Utils::OpenHandle(this);
  i::Isolate* isolate = self->GetIsolate();
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::HandleScope scope(isolate);
  Utils::ApiCheck(
      self->IsSourceTextModule(), "v8::Module::SourceOffsetToLocation",
      "v8::Module::SourceOffsetToLocation must be used on an SourceTextModule");
  i::Handle<i::Script> script(
      i::Handle<i::SourceTextModule>::cast(self)->GetScript(), isolate);
  i::Script::PositionInfo info;
  i::Script::GetPositionInfo(script, offset, &info, i::Script::WITH_OFFSET);
  return v8::Location(info.line, info.column);
}

Local<Value> Module::GetModuleNamespace() {
  Utils::ApiCheck(
      GetStatus() >= kInstantiated, "v8::Module::GetModuleNamespace",
      "v8::Module::GetModuleNamespace must be used on an instantiated module");
  i::Handle<i::Module> self = Utils::OpenHandle(this);
  auto isolate = self->GetIsolate();
  ASSERT_NO_SCRIPT_NO_EXCEPTION(isolate);
  i::Handle<i::JSModuleNamespace> module_namespace =
      i::Module::GetModuleNamespace(isolate, self);
  return ToApiHandle<Value>(module_namespace);
}

Local<UnboundModuleScript> Module::GetUnboundModuleScript() {
  i::Handle<i::Module> self = Utils::OpenHandle(this);
  Utils::ApiCheck(
      self->IsSourceTextModule(), "v8::Module::GetUnboundModuleScript",
      "v8::Module::GetUnboundModuleScript must be used on an SourceTextModule");
  auto isolate = self->GetIsolate();
  ASSERT_NO_SCRIPT_NO_EXCEPTION(isolate);
  return ToApiHandle<UnboundModuleScript>(i::handle(
      i::Handle<i::SourceTextModule>::cast(self)->GetSharedFunctionInfo(),
      isolate));
}

int Module::ScriptId() const {
  i::Module self = *Utils::OpenHandle(this);
  Utils::ApiCheck(self.IsSourceTextModule(), "v8::Module::ScriptId",
                  "v8::Module::ScriptId must be used on an SourceTextModule");
  ASSERT_NO_SCRIPT_NO_EXCEPTION(self.GetIsolate());
  return i::SourceTextModule::cast(self).GetScript().id();
}

bool Module::IsGraphAsync() const {
  Utils::ApiCheck(
      GetStatus() >= kInstantiated, "v8::Module::IsGraphAsync",
      "v8::Module::IsGraphAsync must be used on an instantiated module");
  i::Module self = *Utils::OpenHandle(this);
  auto isolate = self.GetIsolate();
  ASSERT_NO_SCRIPT_NO_EXCEPTION(isolate);
  return self.IsGraphAsync(isolate);
}

bool Module::IsSourceTextModule() const {
  return Utils::OpenHandle(this)->IsSourceTextModule();
}

bool Module::IsSyntheticModule() const {
  return Utils::OpenHandle(this)->IsSyntheticModule();
}

int Module::GetIdentityHash() const { return Utils::OpenHandle(this)->hash(); }

Maybe<bool> Module::InstantiateModule(Local<Context> context,
                                      Module::ResolveModuleCallback callback) {
  auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
  ENTER_V8(isolate, context, Module, InstantiateModule, Nothing<bool>(),
           i::HandleScope);
  has_pending_exception = !i::Module::Instantiate(
      isolate, Utils::OpenHandle(this), context, callback, nullptr);
  RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
  return Just(true);
}

MaybeLocal<Value> Module::Evaluate(Local<Context> context) {
  auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
  TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.Execute");
  ENTER_V8(isolate, context, Module, Evaluate, MaybeLocal<Value>(),
           InternalEscapableScope);
  i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
  i::NestedTimedHistogramScope execute_timer(isolate->counters()->execute(),
                                             isolate);
  i::AggregatingHistogramTimerScope timer(isolate->counters()->compile_lazy());

  i::Handle<i::Module> self = Utils::OpenHandle(this);
  Utils::ApiCheck(self->status() >= i::Module::kLinked, "Module::Evaluate",
                  "Expected instantiated module");

  Local<Value> result;
  has_pending_exception = !ToLocal(i::Module::Evaluate(isolate, self), &result);
  RETURN_ON_FAILED_EXECUTION(Value);
  RETURN_ESCAPED(result);
}

Local<Module> Module::CreateSyntheticModule(
    Isolate* isolate, Local<String> module_name,
    const std::vector<Local<v8::String>>& export_names,
    v8::Module::SyntheticModuleEvaluationSteps evaluation_steps) {
  auto i_isolate = reinterpret_cast<i::Isolate*>(isolate);
  ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
  i::Handle<i::String> i_module_name = Utils::OpenHandle(*module_name);
  i::Handle<i::FixedArray> i_export_names = i_isolate->factory()->NewFixedArray(
      static_cast<int>(export_names.size()));
  for (int i = 0; i < i_export_names->length(); ++i) {
    i::Handle<i::String> str = i_isolate->factory()->InternalizeString(
        Utils::OpenHandle(*export_names[i]));
    i_export_names->set(i, *str);
  }
  return v8::Utils::ToLocal(
      i::Handle<i::Module>(i_isolate->factory()->NewSyntheticModule(
          i_module_name, i_export_names, evaluation_steps)));
}

Maybe<bool> Module::SetSyntheticModuleExport(Isolate* isolate,
                                             Local<String> export_name,
                                             Local<v8::Value> export_value) {
  auto i_isolate = reinterpret_cast<i::Isolate*>(isolate);
  i::Handle<i::String> i_export_name = Utils::OpenHandle(*export_name);
  i::Handle<i::Object> i_export_value = Utils::OpenHandle(*export_value);
  i::Handle<i::Module> self = Utils::OpenHandle(this);
  Utils::ApiCheck(self->IsSyntheticModule(),
                  "v8::Module::SyntheticModuleSetExport",
                  "v8::Module::SyntheticModuleSetExport must only be called on "
                  "a SyntheticModule");
  ENTER_V8_NO_SCRIPT(i_isolate, isolate->GetCurrentContext(), Module,
                     SetSyntheticModuleExport, Nothing<bool>(), i::HandleScope);
  has_pending_exception =
      i::SyntheticModule::SetExport(i_isolate,
                                    i::Handle<i::SyntheticModule>::cast(self),
                                    i_export_name, i_export_value)
          .IsNothing();
  RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
  return Just(true);
}

namespace {

i::ScriptDetails GetScriptDetails(
    i::Isolate* isolate, Local<Value> resource_name, int resource_line_offset,
    int resource_column_offset, Local<Value> source_map_url,
    Local<Data> host_defined_options, ScriptOriginOptions origin_options) {
  i::ScriptDetails script_details(Utils::OpenHandle(*(resource_name), true),
                                  origin_options);
  script_details.line_offset = resource_line_offset;
  script_details.column_offset = resource_column_offset;
  script_details.host_defined_options =
      host_defined_options.IsEmpty()
          ? isolate->factory()->empty_fixed_array()
          : Utils::OpenHandle(*(host_defined_options));
  if (!source_map_url.IsEmpty()) {
    script_details.source_map_url = Utils::OpenHandle(*(source_map_url));
  }
  return script_details;
}

}  // namespace

MaybeLocal<UnboundScript> ScriptCompiler::CompileUnboundInternal(
    Isolate* v8_isolate, Source* source, CompileOptions options,
    NoCacheReason no_cache_reason) {
  auto isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
  TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.ScriptCompiler");
  ENTER_V8_NO_SCRIPT(isolate, v8_isolate->GetCurrentContext(), ScriptCompiler,
                     CompileUnbound, MaybeLocal<UnboundScript>(),
                     InternalEscapableScope);

  i::Handle<i::String> str = Utils::OpenHandle(*(source->source_string));

  i::Handle<i::SharedFunctionInfo> result;
  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.CompileScript");
  i::ScriptDetails script_details = GetScriptDetails(
      isolate, source->resource_name, source->resource_line_offset,
      source->resource_column_offset, source->source_map_url,
      source->host_defined_options, source->resource_options);

  i::MaybeHandle<i::SharedFunctionInfo> maybe_function_info;
  if (options == kConsumeCodeCache) {
    if (source->consume_cache_task) {
      // Take ownership of the internal deserialization task and clear it off
      // the consume task on the source.
      DCHECK_NOT_NULL(source->consume_cache_task->impl_);
      std::unique_ptr<i::BackgroundDeserializeTask> deserialize_task =
          std::move(source->consume_cache_task->impl_);
      maybe_function_info =
          i::Compiler::GetSharedFunctionInfoForScriptWithDeserializeTask(
              isolate, str, script_details, deserialize_task.get(), options,
              no_cache_reason, i::NOT_NATIVES_CODE);
      source->cached_data->rejected = deserialize_task->rejected();
    } else {
      DCHECK(source->cached_data);
      // AlignedCachedData takes care of pointer-aligning the data.
      auto cached_data = std::make_unique<i::AlignedCachedData>(
          source->cached_data->data, source->cached_data->length);
      maybe_function_info =
          i::Compiler::GetSharedFunctionInfoForScriptWithCachedData(
              isolate, str, script_details, cached_data.get(), options,
              no_cache_reason, i::NOT_NATIVES_CODE);
      source->cached_data->rejected = cached_data->rejected();
    }
  } else {
    // Compile without any cache.
    maybe_function_info = i::Compiler::GetSharedFunctionInfoForScript(
        isolate, str, script_details, options, no_cache_reason,
        i::NOT_NATIVES_CODE);
  }

  has_pending_exception = !maybe_function_info.ToHandle(&result);
  RETURN_ON_FAILED_EXECUTION(UnboundScript);
  RETURN_ESCAPED(ToApiHandle<UnboundScript>(result));
}

MaybeLocal<UnboundScript> ScriptCompiler::CompileUnboundScript(
    Isolate* v8_isolate, Source* source, CompileOptions options,
    NoCacheReason no_cache_reason) {
  Utils::ApiCheck(
      !source->GetResourceOptions().IsModule(),
      "v8::ScriptCompiler::CompileUnboundScript",
      "v8::ScriptCompiler::CompileModule must be used to compile modules");
  return CompileUnboundInternal(v8_isolate, source, options, no_cache_reason);
}

MaybeLocal<Script> ScriptCompiler::Compile(Local<Context> context,
                                           Source* source,
                                           CompileOptions options,
                                           NoCacheReason no_cache_reason) {
  Utils::ApiCheck(
      !source->GetResourceOptions().IsModule(), "v8::ScriptCompiler::Compile",
      "v8::ScriptCompiler::CompileModule must be used to compile modules");
  auto isolate = context->GetIsolate();
  MaybeLocal<UnboundScript> maybe =
      CompileUnboundInternal(isolate, source, options, no_cache_reason);
  Local<UnboundScript> result;
  if (!maybe.ToLocal(&result)) return MaybeLocal<Script>();
  v8::Context::Scope scope(context);
  return result->BindToCurrentContext();
}

MaybeLocal<Module> ScriptCompiler::CompileModule(
    Isolate* isolate, Source* source, CompileOptions options,
    NoCacheReason no_cache_reason) {
  Utils::ApiCheck(options == kNoCompileOptions || options == kConsumeCodeCache,
                  "v8::ScriptCompiler::CompileModule",
                  "Invalid CompileOptions");
  Utils::ApiCheck(source->GetResourceOptions().IsModule(),
                  "v8::ScriptCompiler::CompileModule",
                  "Invalid ScriptOrigin: is_module must be true");
  MaybeLocal<UnboundScript> maybe =
      CompileUnboundInternal(isolate, source, options, no_cache_reason);
  Local<UnboundScript> unbound;
  if (!maybe.ToLocal(&unbound)) return MaybeLocal<Module>();
  i::Handle<i::SharedFunctionInfo> shared = Utils::OpenHandle(*unbound);
  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
  return ToApiHandle<Module>(i_isolate->factory()->NewSourceTextModule(shared));
}

namespace {
bool IsIdentifier(i::Isolate* isolate, i::Handle<i::String> string) {
  string = i::String::Flatten(isolate, string);
  const int length = string->length();
  if (length == 0) return false;
  if (!i::IsIdentifierStart(string->Get(0))) return false;
  i::DisallowGarbageCollection no_gc;
  i::String::FlatContent flat = string->GetFlatContent(no_gc);
  if (flat.IsOneByte()) {
    auto vector = flat.ToOneByteVector();
    for (int i = 1; i < length; i++) {
      if (!i::IsIdentifierPart(vector[i])) return false;
    }
  } else {
    auto vector = flat.ToUC16Vector();
    for (int i = 1; i < length; i++) {
      if (!i::IsIdentifierPart(vector[i])) return false;
    }
  }
  return true;
}
}  // namespace

// static
V8_WARN_UNUSED_RESULT MaybeLocal<Function> ScriptCompiler::CompileFunction(
    Local<Context> context, Source* source, size_t arguments_count,
    Local<String> arguments[], size_t context_extension_count,
    Local<Object> context_extensions[], CompileOptions options,
    NoCacheReason no_cache_reason) {
  return CompileFunctionInternal(context, source, arguments_count, arguments,
                                 context_extension_count, context_extensions,
                                 options, no_cache_reason, nullptr);
}

// static
MaybeLocal<Function> ScriptCompiler::CompileFunctionInContext(
    Local<Context> context, Source* source, size_t arguments_count,
    Local<String> arguments[], size_t context_extension_count,
    Local<Object> context_extensions[], CompileOptions options,
    NoCacheReason no_cache_reason,
    Local<ScriptOrModule>* script_or_module_out) {
  return CompileFunctionInternal(
      context, source, arguments_count, arguments, context_extension_count,
      context_extensions, options, no_cache_reason, script_or_module_out);
}

MaybeLocal<Function> S