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      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 
     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 
     58     ~JSCallbackData()
     59     {
     60         ASSERT(m_thread == currentThread());
     61     }
     62 
     63     JSC::JSObject* callback() { return m_callback.get(); }
     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:
     78     static PassOwnPtr<DeleteCallbackDataTask> create(JSCallbackData* data)
     79     {
     80         return new DeleteCallbackDataTask(data);
     81     }
     82 
     83     virtual void performTask(ScriptExecutionContext*)
     84     {
     85         delete m_data;
     86     }
     87     virtual bool isCleanupTask() const { return true; }
     88 private:
     89 
     90     DeleteCallbackDataTask(JSCallbackData* data) : m_data(data) {}
     91 
     92     JSCallbackData* m_data;
     93 };
     94 
     95 } // namespace WebCore
     96 
     97 #endif // JSCallbackData_h
     98