v8messagechannelconstructor.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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#include "config.h"
#include "MessageChannel.h"

#include "Document.h"
#include "Frame.h"

#include "V8Binding.h"
#include "V8Proxy.h"

#include <wtf/RefPtr.h>

namespace WebCore {

CALLBACK_FUNC_DECL(MessageChannelConstructor)
{
    INC_STATS("DOM.MessageChannel.Constructor");
    // FIXME: The logic here is almost exact duplicate of V8::ConstructDOMObject.
    // Consider refactoring to reduce duplication.
    if (!args.IsConstructCall())
        return throwError("DOM object constructor cannot be called as a function.");

    // Get the document.
    Frame* frame = V8Proxy::retrieveFrame();
    if (!frame)
        return v8::Undefined();

    Document* document = frame->document();

    // Note: it's OK to let this RefPtr go out of scope because we also call
    // SetDOMWrapper(), which effectively holds a reference to obj.
    RefPtr<MessageChannel> obj = MessageChannel::create(document);

    v8::Local<v8::Object> messageChannel = args.Holder();

    // Create references from the MessageChannel wrapper to the two
    // MessagePort wrappers to make sure that the MessagePort wrappers
    // stay alive as long as the MessageChannel wrapper is around.
    messageChannel->SetInternalField(kMessageChannelPort1Index, V8Proxy::ToV8Object(V8ClassIndex::MESSAGEPORT, obj->port1()));
    messageChannel->SetInternalField(kMessageChannelPort2Index, V8Proxy::ToV8Object(V8ClassIndex::MESSAGEPORT, obj->port2()));

    // Setup the standard wrapper object internal fields.
    V8Proxy::SetDOMWrapper(messageChannel, V8ClassIndex::MESSAGECHANNEL, obj.get());
    return toV8(obj.release(), messageChannel);
}


} // namespace WebCore