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 "IncrementalSweeper.h"
  32 #include "JSLock.h"
  33 #include <wtf/WTFThreadData.h>
  34
  35 namespace JSC {
  36
  37 class APIEntryShimWithoutLock {
  38 protected:
  39     APIEntryShimWithoutLock(VM* vm, bool registerThread)
  40         : m_vm(vm)
  41         , m_entryIdentifierTable(wtfThreadData().setCurrentIdentifierTable(vm->identifierTable))
  42     {
  43         if (registerThread)
  44             vm->heap.machineThreads().addCurrentThread();
  45     }
  46
  47     ~APIEntryShimWithoutLock()
  48     {
  49         wtfThreadData().setCurrentIdentifierTable(m_entryIdentifierTable);
  50     }
  51
  52 protected:
  53     RefPtr<VM> m_vm;
  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->vm(), registerThread)
  62         , m_lockHolder(exec)
  63     {
  64     }
  65
  66     // JSPropertyNameAccumulator only has a vm.
  67     APIEntryShim(VM* vm, bool registerThread = true)
  68         : APIEntryShimWithoutLock(vm, registerThread)
  69         , m_lockHolder(vm)
  70     {
  71     }
  72
  73     ~APIEntryShim()
  74     {
  75         // Destroying our JSLockHolder should also destroy the VM.
  76         m_vm.clear();
  77     }
  78
  79 private:
  80     JSLockHolder m_lockHolder;
  81 };
  82
  83 class APICallbackShim {
  84 public:
  85     APICallbackShim(ExecState* exec)
  86         : m_dropAllLocks(exec)
  87         , m_vm(&exec->vm())
  88     {
  89         wtfThreadData().resetCurrentIdentifierTable();
  90     }
  91
  92     ~APICallbackShim()
  93     {
  94         wtfThreadData().setCurrentIdentifierTable(m_vm->identifierTable);
  95     }
  96
  97 private:
  98     JSLock::DropAllLocks m_dropAllLocks;
  99     VM* m_vm;
 100 };
 101
 102 }
 103
 104 #endif