1 /*

     2  * Copyright (C) 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  * 1. Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

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

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

    24  */

    25 

    26 #ifndef APIShims_h

    27 #define APIShims_h

    28 

    29 #include "CallFrame.h"

    30 #include "JSLock.h"

    31 #include <wtf/WTFThreadData.h>

    32 

    33 namespace JSC {

    34 

    35 class APIEntryShimWithoutLock {

    36 protected:

    37     APIEntryShimWithoutLock(JSGlobalData* globalData, bool registerThread)

    38         : m_globalData(globalData)

    39         , m_entryIdentifierTable(wtfThreadData().setCurrentIdentifierTable(globalData->identifierTable))

    40     {

    41         if (registerThread)

    42             globalData->heap.registerThread();

    43         m_globalData->timeoutChecker.start();

    44     }

    45 

    46     ~APIEntryShimWithoutLock()

    47     {

    48         m_globalData->timeoutChecker.stop();

    49         wtfThreadData().setCurrentIdentifierTable(m_entryIdentifierTable);

    50     }

    51 

    52 private:

    53     JSGlobalData* m_globalData;

    54     IdentifierTable* m_entryIdentifierTable;

    55 };

    56 

    57 class APIEntryShim : public APIEntryShimWithoutLock {

    58 public:

    59     // Normal API entry

    60     APIEntryShim(ExecState* exec, bool registerThread = true)

    61         : APIEntryShimWithoutLock(&exec->globalData(), registerThread)

    62         , m_lock(exec)

    63     {

    64     }

    65 

    66     // JSPropertyNameAccumulator only has a globalData.

    67     APIEntryShim(JSGlobalData* globalData, bool registerThread = true)

    68         : APIEntryShimWithoutLock(globalData, registerThread)

    69         , m_lock(globalData->isSharedInstance() ? LockForReal : SilenceAssertionsOnly)

    70     {

    71     }

    72 

    73 private:

    74     JSLock m_lock;

    75 };

    76 

    77 class APICallbackShim {

    78 public:

    79     APICallbackShim(ExecState* exec)

    80         : m_dropAllLocks(exec)

    81         , m_globalData(&exec->globalData())

    82     {

    83         wtfThreadData().resetCurrentIdentifierTable();

    84     }

    85 

    86     ~APICallbackShim()

    87     {

    88         wtfThreadData().setCurrentIdentifierTable(m_globalData->identifierTable);

    89     }

    90 

    91 private:

    92     JSLock::DropAllLocks m_dropAllLocks;

    93     JSGlobalData* m_globalData;

    94 };

    95 

    96 }

    97 

    98 #endif