API/APIShims.h

   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