third_party/WebKit/Source/platform/bindings/V8ObjectConstructor.cpp

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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#include "platform/bindings/V8ObjectConstructor.h"

#include "platform/bindings/OriginTrialFeatures.h"
#include "platform/bindings/RuntimeCallStats.h"
#include "platform/bindings/V8Binding.h"
#include "platform/bindings/V8PerContextData.h"
#include "platform/bindings/V8ThrowException.h"
#include "platform/instrumentation/tracing/TraceEvent.h"

namespace blink {

v8::MaybeLocal<v8::Object> V8ObjectConstructor::NewInstance(
    v8::Isolate* isolate,
    v8::Local<v8::Function> function,
    int argc,
    v8::Local<v8::Value> argv[]) {
  DCHECK(!function.IsEmpty());
  TRACE_EVENT0("v8", "v8.newInstance");
  RUNTIME_CALL_TIMER_SCOPE(isolate, RuntimeCallStats::CounterId::kV8);
  ConstructorMode constructor_mode(isolate);
  v8::MicrotasksScope microtasks_scope(
      isolate, v8::MicrotasksScope::kDoNotRunMicrotasks);
  v8::MaybeLocal<v8::Object> result =
      function->NewInstance(isolate->GetCurrentContext(), argc, argv);
  CHECK(!isolate->IsDead());
  return result;
}

void V8ObjectConstructor::IsValidConstructorMode(
    const v8::FunctionCallbackInfo<v8::Value>& info) {
  RUNTIME_CALL_TIMER_SCOPE_DISABLED_BY_DEFAULT(info.GetIsolate(),
                                               "Blink_IsValidConstructorMode");
  if (ConstructorMode::Current(info.GetIsolate()) ==
      ConstructorMode::kCreateNewObject) {
    V8ThrowException::ThrowTypeError(info.GetIsolate(), "Illegal constructor");
    return;
  }
  V8SetReturnValue(info, info.Holder());
}

v8::Local<v8::Function> V8ObjectConstructor::CreateInterfaceObject(
    const WrapperTypeInfo* type,
    v8::Local<v8::Context> context,
    const DOMWrapperWorld& world,
    v8::Isolate* isolate,
    v8::Local<v8::Function> parent_interface,
    CreationMode creation_mode) {
  // We shouldn't reach this point for the types that are implemented in v8 such
  // as typed arrays and hence don't have domTemplateFunction.
  DCHECK(type->dom_template_function);
  v8::Local<v8::FunctionTemplate> interface_template =
      type->domTemplate(isolate, world);
  // Getting the function might fail if we're running out of stack or memory.
  v8::Local<v8::Function> interface_object;
  bool get_interface_object =
      interface_template->GetFunction(context).ToLocal(&interface_object);
  CHECK(get_interface_object);

  if (type->parent_class) {
    DCHECK(!parent_interface.IsEmpty());
    bool set_parent_interface =
        interface_object->SetPrototype(context, parent_interface).ToChecked();
    CHECK(set_parent_interface);
  }

  v8::Local<v8::Object> prototype_object;
  if (type->wrapper_type_prototype ==
      WrapperTypeInfo::kWrapperTypeObjectPrototype) {
    v8::Local<v8::Value> prototype_value;
    bool get_prototype_value =
        interface_object->Get(context, V8AtomicString(isolate, "prototype"))
            .ToLocal(&prototype_value);
    CHECK(get_prototype_value);
    CHECK(prototype_value->IsObject());

    prototype_object = prototype_value.As<v8::Object>();
    if (prototype_object->InternalFieldCount() ==
        kV8PrototypeInternalFieldcount) {
      prototype_object->SetAlignedPointerInInternalField(
          kV8PrototypeTypeIndex, const_cast<WrapperTypeInfo*>(type));
    }
  }

  if (creation_mode == CreationMode::kInstallConditionalFeatures) {
    type->InstallConditionalFeatures(context, world, v8::Local<v8::Object>(),
                                     prototype_object, interface_object,
                                     interface_template);
    InstallOriginTrialFeatures(type, ScriptState::From(context),
                               prototype_object, interface_object);
  }

  return interface_object;
}

}  // namespace blink