1/*
2 * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef JSCallbackData_h
30#define JSCallbackData_h
31
32#include "JSDOMBinding.h"
33#include "JSDOMGlobalObject.h"
34#include "ScriptExecutionContext.h"
35#include <heap/Strong.h>
36#include <heap/StrongInlines.h>
37#include <runtime/JSObject.h>
38#include <wtf/Threading.h>
39
40namespace WebCore {
41
42// We have to clean up this data on the context thread because unprotecting a
43// JSObject on the wrong thread without synchronization would corrupt the heap
44// (and synchronization would be slow).
45
46class JSCallbackData {
47public:
48    static void deleteData(void*);
49
50    JSCallbackData(JSC::JSObject* callback, JSDOMGlobalObject* globalObject)
51        : m_callback(globalObject->vm(), callback)
52        , m_globalObject(globalObject->vm(), globalObject)
53#ifndef NDEBUG
54        , m_thread(currentThread())
55#endif
56    {
57    }
58
59    ~JSCallbackData()
60    {
61        ASSERT(m_thread == currentThread());
62    }
63
64    JSC::JSObject* callback() { return m_callback.get(); }
65    JSDOMGlobalObject* globalObject() { return m_globalObject.get(); }
66
67    JSC::JSValue invokeCallback(JSC::MarkedArgumentBuffer&, bool* raisedException = 0);
68    JSC::JSValue invokeCallback(JSC::JSValue thisValue, JSC::MarkedArgumentBuffer&, bool* raisedException = 0);
69
70private:
71    JSC::Strong<JSC::JSObject> m_callback;
72    JSC::Strong<JSDOMGlobalObject> m_globalObject;
73#ifndef NDEBUG
74    ThreadIdentifier m_thread;
75#endif
76};
77
78class DeleteCallbackDataTask : public ScriptExecutionContext::Task {
79public:
80    static PassOwnPtr<DeleteCallbackDataTask> create(JSCallbackData* data)
81    {
82        return adoptPtr(new DeleteCallbackDataTask(data));
83    }
84
85    virtual void performTask(ScriptExecutionContext*)
86    {
87        delete m_data;
88    }
89    virtual bool isCleanupTask() const { return true; }
90private:
91
92    DeleteCallbackDataTask(JSCallbackData* data) : m_data(data) {}
93
94    JSCallbackData* m_data;
95};
96
97} // namespace WebCore
98
99#endif // JSCallbackData_h
100