webkit/src/WebCore/bindings/js/JSCallbackData.h

/*
 * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
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 * 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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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#ifndef JSCallbackData_h
#define JSCallbackData_h

#include "JSDOMBinding.h"
#include "JSDOMGlobalObject.h"
#include <runtime/JSObject.h>
#include <runtime/Protect.h>
#include <wtf/Threading.h>

namespace WebCore {

// We have to clean up this data on the main thread because unprotecting a
// JSObject on a non-main thread without synchronization would corrupt the heap
// (and synchronization would be slow).

class JSCallbackData {
public:
    static void deleteData(void*);

    JSCallbackData(JSC::JSObject* callback, JSDOMGlobalObject* globalObject)
        : m_callback(callback)
        , m_globalObject(globalObject)
        , m_isolatedWorld(currentWorld(globalObject->globalExec()))
    {
    }
    
    ~JSCallbackData()
    {
        ASSERT(isMainThread());
    }

    JSC::JSObject* callback() { return m_callback.get(); }
    JSDOMGlobalObject* globalObject() { return m_globalObject.get(); }
    
    JSC::JSValue invokeCallback(JSC::MarkedArgumentBuffer&, bool* raisedException = 0);

private:
    JSC::ProtectedPtr<JSC::JSObject> m_callback;
    JSC::ProtectedPtr<JSDOMGlobalObject> m_globalObject;
    RefPtr<DOMWrapperWorld> m_isolatedWorld;
};

} // namespace WebCore

#endif // JSCallbackData_h