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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 "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
    100