api.cc.svn-base

Google浏览器V8内核代码

}


void Context::Enter() {
  if (IsDeadCheck("v8::Context::Enter()")) return;
  i::Handle<i::Context> env = Utils::OpenHandle(this);
  thread_local.EnterContext(env);

  thread_local.SaveContext(i::GlobalHandles::Create(i::Top::context()));
  i::Top::set_context(*env);

  thread_local.SaveSecurityContext(
      i::GlobalHandles::Create(i::Top::security_context()));
  i::Top::set_security_context(*env);
}


void Context::Exit() {
  if (has_shut_down) return;
  if (!ApiCheck(thread_local.LeaveLastContext(),
                "v8::Context::Exit()",
                "Cannot exit non-entered context")) {
    return;
  }

  // Content of 'last_context' and 'last_security_context' could be NULL.
  i::Handle<i::Object> last_context = thread_local.RestoreContext();
  i::Top::set_context(static_cast<i::Context*>(*last_context));
  i::GlobalHandles::Destroy(last_context.location());

  i::Handle<i::Object> last_security_context =
      thread_local.RestoreSecurityContext();
  i::Top::set_security_context(
      static_cast<i::Context*>(*last_security_context));
  i::GlobalHandles::Destroy(last_security_context.location());
}


void v8::HandleScope::DeleteExtensions() {
  ASSERT(current_.extensions != 0);
  thread_local.DeleteExtensions(current_.extensions);
}


void HandleScope::ZapRange(void** start, void** end) {
  if (start == NULL) return;
  for (void** p = start; p < end; p++) {
    *p = reinterpret_cast<void*>(v8::internal::kHandleZapValue);
  }
}


void** v8::HandleScope::RawClose(void** value) {
  if (!ApiCheck(!is_closed_,
                "v8::HandleScope::Close()",
                "Local scope has already been closed")) {
    return 0;
  }
  LOG_API("CloseHandleScope");

  // Read the result before popping the handle block.
  i::Object* result = reinterpret_cast<i::Object*>(*value);
  is_closed_ = true;
  RestorePreviousState();

  // Allocate a new handle on the previous handle block.
  i::Handle<i::Object> handle(result);
  return reinterpret_cast<void**>(handle.location());
}


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


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


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


NeanderArray::NeanderArray() : obj_(2) {
  obj_.set(0, i::Smi::FromInt(0));
}


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


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


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


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


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


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


void Template::Set(v8::Handle<String> name, v8::Handle<Data> value,
                   v8::PropertyAttribute attribute) {
  if (IsDeadCheck("v8::Template::SetProperty()")) return;
  HandleScope scope;
  i::Handle<i::Object> list(Utils::OpenHandle(this)->property_list());
  if (list->IsUndefined()) {
    list = NeanderArray().value();
    Utils::OpenHandle(this)->set_property_list(*list);
  }
  NeanderArray array(list);
  array.add(Utils::OpenHandle(*name));
  array.add(Utils::OpenHandle(*value));
  array.add(Utils::OpenHandle(*v8::Integer::New(attribute)));
}


// --- F u n c t i o n   T e m p l a t e ---
static void InitializeFunctionTemplate(
      i::Handle<i::FunctionTemplateInfo> info) {
  info->set_tag(i::Smi::FromInt(Consts::FUNCTION_TEMPLATE));
  info->set_flag(0);
}


Local<ObjectTemplate> FunctionTemplate::PrototypeTemplate() {
  if (IsDeadCheck("v8::FunctionTemplate::PrototypeTemplate()")) {
    return Local<ObjectTemplate>();
  }
  i::Handle<i::Object> result(Utils::OpenHandle(this)->prototype_template());
  if (result->IsUndefined()) {
    result = Utils::OpenHandle(*ObjectTemplate::New());
    Utils::OpenHandle(this)->set_prototype_template(*result);
  }
  return Local<ObjectTemplate>(ToApi<ObjectTemplate>(result));
}


void FunctionTemplate::Inherit(v8::Handle<FunctionTemplate> value) {
  if (IsDeadCheck("v8::FunctionTemplate::Inherit()")) return;
  Utils::OpenHandle(this)->set_parent_template(*Utils::OpenHandle(*value));
}


// To distinguish the function templates, so that we can find them in the
// function cache of the global context.
static int next_serial_number = 0;


Local<FunctionTemplate> FunctionTemplate::New(InvocationCallback callback,
    v8::Handle<Value> data, v8::Handle<Signature> signature) {
  EnsureInitialized("v8::FunctionTemplate::New()");
  LOG_API("FunctionTemplate::New");
  i::Handle<i::Struct> struct_obj =
      i::Factory::NewStruct(i::FUNCTION_TEMPLATE_INFO_TYPE);
  i::Handle<i::FunctionTemplateInfo> obj =
      i::Handle<i::FunctionTemplateInfo>::cast(struct_obj);
  InitializeFunctionTemplate(obj);
  obj->set_serial_number(i::Smi::FromInt(next_serial_number++));
  if (callback != 0) {
    if (data.IsEmpty()) data = v8::Undefined();
    Utils::ToLocal(obj)->SetCallHandler(callback, data);
  }
  obj->set_undetectable(false);
  obj->set_needs_access_check(false);

  if (!signature.IsEmpty())
    obj->set_signature(*Utils::OpenHandle(*signature));
  return Utils::ToLocal(obj);
}


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


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


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


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


void FunctionTemplate::SetCallHandler(InvocationCallback callback,
                                      v8::Handle<Value> data) {
  if (IsDeadCheck("v8::FunctionTemplate::SetCallHandler()")) return;
  HandleScope scope;
  i::Handle<i::Struct> struct_obj =
      i::Factory::NewStruct(i::CALL_HANDLER_INFO_TYPE);
  i::Handle<i::CallHandlerInfo> obj =
      i::Handle<i::CallHandlerInfo>::cast(struct_obj);
  obj->set_callback(*FromCData(callback));
  if (data.IsEmpty()) data = v8::Undefined();
  obj->set_data(*Utils::OpenHandle(*data));
  Utils::OpenHandle(this)->set_call_code(*obj);
}


void FunctionTemplate::AddInstancePropertyAccessor(
      v8::Handle<String> name,
      AccessorGetter getter,
      AccessorSetter setter,
      v8::Handle<Value> data,
      v8::AccessControl settings,
      v8::PropertyAttribute attributes) {
  if (IsDeadCheck("v8::FunctionTemplate::AddInstancePropertyAccessor()")) {
    return;
  }
  HandleScope scope;
  i::Handle<i::AccessorInfo> obj = i::Factory::NewAccessorInfo();
  ASSERT(getter != NULL);
  obj->set_getter(*FromCData(getter));
  obj->set_setter(*FromCData(setter));
  if (data.IsEmpty()) data = v8::Undefined();
  obj->set_data(*Utils::OpenHandle(*data));
  obj->set_name(*Utils::OpenHandle(*name));
  if (settings & ALL_CAN_READ) obj->set_all_can_read(true);
  if (settings & ALL_CAN_WRITE) obj->set_all_can_write(true);
  obj->set_property_attributes(static_cast<PropertyAttributes>(attributes));

  i::Handle<i::Object> list(Utils::OpenHandle(this)->property_accessors());
  if (list->IsUndefined()) {
    list = NeanderArray().value();
    Utils::OpenHandle(this)->set_property_accessors(*list);
  }
  NeanderArray array(list);
  array.add(obj);
}


Local<ObjectTemplate> FunctionTemplate::InstanceTemplate() {
  if (IsDeadCheck("v8::FunctionTemplate::InstanceTemplate()")
      || EmptyCheck("v8::FunctionTemplate::InstanceTemplate()", this))
    return Local<ObjectTemplate>();
  if (Utils::OpenHandle(this)->instance_template()->IsUndefined()) {
    Local<ObjectTemplate> templ =
        ObjectTemplate::New(v8::Handle<FunctionTemplate>(this));
    Utils::OpenHandle(this)->set_instance_template(*Utils::OpenHandle(*templ));
  }
  i::Handle<i::ObjectTemplateInfo> result(i::ObjectTemplateInfo::cast(
        Utils::OpenHandle(this)->instance_template()));
  return Utils::ToLocal(result);
}


void FunctionTemplate::SetClassName(Handle<String> name) {
  if (IsDeadCheck("v8::FunctionTemplate::SetClassName()")) return;
  Utils::OpenHandle(this)->set_class_name(*Utils::OpenHandle(*name));
}


void FunctionTemplate::SetHiddenPrototype(bool value) {
  if (IsDeadCheck("v8::FunctionTemplate::SetHiddenPrototype()")) return;
  Utils::OpenHandle(this)->set_hidden_prototype(value);
}


void FunctionTemplate::SetNamedInstancePropertyHandler(
      NamedPropertyGetter getter,
      NamedPropertySetter setter,
      NamedPropertyQuery query,
      NamedPropertyDeleter remover,
      NamedPropertyEnumerator enumerator,
      Handle<Value> data) {
  if (IsDeadCheck("v8::FunctionTemplate::SetNamedInstancePropertyHandler()")) {
    return;
  }
  HandleScope scope;
  i::Handle<i::Struct> struct_obj =
      i::Factory::NewStruct(i::INTERCEPTOR_INFO_TYPE);
  i::Handle<i::InterceptorInfo> obj =
      i::Handle<i::InterceptorInfo>::cast(struct_obj);
  if (getter != 0) obj->set_getter(*FromCData(getter));
  if (setter != 0) obj->set_setter(*FromCData(setter));
  if (query != 0) obj->set_query(*FromCData(query));
  if (remover != 0) obj->set_deleter(*FromCData(remover));
  if (enumerator != 0) obj->set_enumerator(*FromCData(enumerator));
  if (data.IsEmpty()) data = v8::Undefined();
  obj->set_data(*Utils::OpenHandle(*data));
  Utils::OpenHandle(this)->set_named_property_handler(*obj);
}


void FunctionTemplate::SetIndexedInstancePropertyHandler(
      IndexedPropertyGetter getter,
      IndexedPropertySetter setter,
      IndexedPropertyQuery query,
      IndexedPropertyDeleter remover,
      IndexedPropertyEnumerator enumerator,
      Handle<Value> data) {
  if (IsDeadCheck(
        "v8::FunctionTemplate::SetIndexedInstancePropertyHandler()")) {
    return;
  }
  HandleScope scope;
  i::Handle<i::Struct> struct_obj =
      i::Factory::NewStruct(i::INTERCEPTOR_INFO_TYPE);
  i::Handle<i::InterceptorInfo> obj =
      i::Handle<i::InterceptorInfo>::cast(struct_obj);
  if (getter != 0) obj->set_getter(*FromCData(getter));
  if (setter != 0) obj->set_setter(*FromCData(setter));
  if (query != 0) obj->set_query(*FromCData(query));
  if (remover != 0) obj->set_deleter(*FromCData(remover));
  if (enumerator != 0) obj->set_enumerator(*FromCData(enumerator));
  if (data.IsEmpty()) data = v8::Undefined();
  obj->set_data(*Utils::OpenHandle(*data));
  Utils::OpenHandle(this)->set_indexed_property_handler(*obj);
}


void FunctionTemplate::SetInstanceCallAsFunctionHandler(
      InvocationCallback callback,
      Handle<Value> data) {
  if (IsDeadCheck("v8::FunctionTemplate::SetInstanceCallAsFunctionHandler()")) {
    return;
  }
  HandleScope scope;
  i::Handle<i::Struct> struct_obj =
      i::Factory::NewStruct(i::CALL_HANDLER_INFO_TYPE);