/*

 * Copyright (C) 2007, 2008, 2009 Apple 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.

 * 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

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL APPLE 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 SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef JSCallbackData_h

#define JSCallbackData_h

#include "JSDOMBinding.h"

#include "JSDOMGlobalObject.h"

#include "ScriptExecutionContext.h"

#include <runtime/JSObject.h>

#include <runtime/Protect.h>

#include <wtf/Threading.h>

namespace WebCore {

// We have to clean up this data on the context thread because unprotecting a

// JSObject on the wrong 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)

#ifndef NDEBUG

        , m_thread(currentThread())

#endif

    {

    }

    ~JSCallbackData()

    {

        ASSERT(m_thread == currentThread());

    }

    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;

#ifndef NDEBUG

    ThreadIdentifier m_thread;

#endif

};

class DeleteCallbackDataTask : public ScriptExecutionContext::Task {

public:

    static PassOwnPtr<DeleteCallbackDataTask> create(JSCallbackData* data)

    {

        return new DeleteCallbackDataTask(data);

    }

    virtual void performTask(ScriptExecutionContext*)

    {

        delete m_data;

    }

    virtual bool isCleanupTask() const { return true; }

private:

    DeleteCallbackDataTask(JSCallbackData* data) : m_data(data) {}

    JSCallbackData* m_data;

};

} // namespace WebCore

#endif // JSCallbackData_h