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 <runtime/JSObject.h>
37 #include <wtf/Threading.h>
38 
39 namespace WebCore {
40 
41 // We have to clean up this data on the context thread because unprotecting a
42 // JSObject on the wrong thread without synchronization would corrupt the heap
43 // (and synchronization would be slow).
44 
45 class JSCallbackData {
46 public:
47     static void deleteData(void*);
48 
JSCallbackData(JSC::JSObject * callback,JSDOMGlobalObject * globalObject)49     JSCallbackData(JSC::JSObject* callback, JSDOMGlobalObject* globalObject)
50         : m_callback(globalObject->globalData(), callback)
51         , m_globalObject(globalObject->globalData(), globalObject)
52 #ifndef NDEBUG
53         , m_thread(currentThread())
54 #endif
55     {
56     }
57 
~JSCallbackData()58     ~JSCallbackData()
59     {
60         ASSERT(m_thread == currentThread());
61     }
62 
callback()63     JSC::JSObject* callback() { return m_callback.get(); }
globalObject()64     JSDOMGlobalObject* globalObject() { return m_globalObject.get(); }
65 
66     JSC::JSValue invokeCallback(JSC::MarkedArgumentBuffer&, bool* raisedException = 0);
67 
68 private:
69     JSC::Strong<JSC::JSObject> m_callback;
70     JSC::Strong<JSDOMGlobalObject> m_globalObject;
71 #ifndef NDEBUG
72     ThreadIdentifier m_thread;
73 #endif
74 };
75 
76 class DeleteCallbackDataTask : public ScriptExecutionContext::Task {
77 public:
create(JSCallbackData * data)78     static PassOwnPtr<DeleteCallbackDataTask> create(JSCallbackData* data)
79     {
80         return adoptPtr(new DeleteCallbackDataTask(data));
81     }
82 
performTask(ScriptExecutionContext *)83     virtual void performTask(ScriptExecutionContext*)
84     {
85         delete m_data;
86     }
isCleanupTask()87     virtual bool isCleanupTask() const { return true; }
88 private:
89 
DeleteCallbackDataTask(JSCallbackData * data)90     DeleteCallbackDataTask(JSCallbackData* data) : m_data(data) {}
91 
92     JSCallbackData* m_data;
93 };
94 
95 } // namespace WebCore
96 
97 #endif // JSCallbackData_h
98