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 <runtime/JSObject.h>

    36 #include <runtime/Protect.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(callback)

    51         , m_globalObject(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::ProtectedPtr<JSC::JSObject> m_callback;

    70     JSC::ProtectedPtr<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