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 "GCActivityCallback.h"
  31 #include "JSLock.h"
  32 #include <wtf/WTFThreadData.h>
  33
  34 namespace JSC {
  35
  36 class APIEntryShimWithoutLock {
  37 protected:
  38     APIEntryShimWithoutLock(JSGlobalData* globalData, bool registerThread)
  39         : m_globalData(globalData)
  40         , m_entryIdentifierTable(wtfThreadData().setCurrentIdentifierTable(globalData->identifierTable))
  41     {
  42         UNUSED_PARAM(registerThread);
  43 #if ENABLE(JSC_MULTIPLE_THREADS)
  44         if (registerThread)
  45             globalData->heap.machineThreads().addCurrentThread();
  46 #endif
  47         m_globalData->heap.activityCallback()->synchronize();
  48         m_globalData->timeoutChecker.start();
  49     }
  50
  51     ~APIEntryShimWithoutLock()
  52     {
  53         m_globalData->timeoutChecker.stop();
  54         wtfThreadData().setCurrentIdentifierTable(m_entryIdentifierTable);
  55     }
  56
  57 private:
  58     JSGlobalData* m_globalData;
  59     IdentifierTable* m_entryIdentifierTable;
  60 };
  61
  62 class APIEntryShim : public APIEntryShimWithoutLock {
  63 public:
  64     // Normal API entry
  65     APIEntryShim(ExecState* exec, bool registerThread = true)
  66         : APIEntryShimWithoutLock(&exec->globalData(), registerThread)
  67         , m_lock(exec)
  68     {
  69     }
  70
  71     // JSPropertyNameAccumulator only has a globalData.
  72     APIEntryShim(JSGlobalData* globalData, bool registerThread = true)
  73         : APIEntryShimWithoutLock(globalData, registerThread)
  74         , m_lock(globalData->isSharedInstance() ? LockForReal : SilenceAssertionsOnly)
  75     {
  76     }
  77
  78 private:
  79     JSLock m_lock;
  80 };
  81
  82 class APICallbackShim {
  83 public:
  84     APICallbackShim(ExecState* exec)
  85         : m_dropAllLocks(exec)
  86         , m_globalData(&exec->globalData())
  87     {
  88         wtfThreadData().resetCurrentIdentifierTable();
  89     }
  90
  91     ~APICallbackShim()
  92     {
  93         m_globalData->heap.activityCallback()->synchronize();
  94         wtfThreadData().setCurrentIdentifierTable(m_globalData->identifierTable);
  95     }
  96
  97 private:
  98     JSLock::DropAllLocks m_dropAllLocks;
  99     JSGlobalData* m_globalData;
 100 };
 101
 102 }
 103
 104 #endif