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
  32 namespace JSC {
  33
  34 class APIEntryShimWithoutLock {
  35 protected:
  36     APIEntryShimWithoutLock(JSGlobalData* globalData, bool registerThread)
  37         : m_globalData(globalData)
  38         , m_entryIdentifierTable(setCurrentIdentifierTable(globalData->identifierTable))
  39     {
  40         if (registerThread)
  41             globalData->heap.registerThread();
  42         m_globalData->timeoutChecker.start();
  43     }
  44
  45     ~APIEntryShimWithoutLock()
  46     {
  47         m_globalData->timeoutChecker.stop();
  48         setCurrentIdentifierTable(m_entryIdentifierTable);
  49     }
  50
  51 private:
  52     JSGlobalData* m_globalData;
  53     IdentifierTable* m_entryIdentifierTable;
  54 };
  55
  56 class APIEntryShim : public APIEntryShimWithoutLock {
  57 public:
  58     // Normal API entry
  59     APIEntryShim(ExecState* exec, bool registerThread = true)
  60         : APIEntryShimWithoutLock(&exec->globalData(), registerThread)
  61         , m_lock(exec)
  62     {
  63     }
  64
  65     // JSPropertyNameAccumulator only has a globalData.
  66     APIEntryShim(JSGlobalData* globalData, bool registerThread = true)
  67         : APIEntryShimWithoutLock(globalData, registerThread)
  68         , m_lock(globalData->isSharedInstance ? LockForReal : SilenceAssertionsOnly)
  69     {
  70     }
  71
  72 private:
  73     JSLock m_lock;
  74 };
  75
  76 class APICallbackShim {
  77 public:
  78     APICallbackShim(ExecState* exec)
  79         : m_dropAllLocks(exec)
  80         , m_globalData(&exec->globalData())
  81     {
  82         resetCurrentIdentifierTable();
  83         m_globalData->timeoutChecker.start();
  84     }
  85
  86     ~APICallbackShim()
  87     {
  88         m_globalData->timeoutChecker.stop();
  89         setCurrentIdentifierTable(m_globalData->identifierTable);
  90     }
  91
  92 private:
  93     JSLock::DropAllLocks m_dropAllLocks;
  94     JSGlobalData* m_globalData;
  95 };
  96
  97 }
  98
  99 #endif