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      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
    105