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:
APIEntryShimWithoutLock(JSGlobalData * globalData,bool registerThread)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 
~APIEntryShimWithoutLock()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)
APIEntryShimWithoutLock(globalData,registerThread)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:
APICallbackShim(ExecState * exec)78     APICallbackShim(ExecState* exec)
79         : m_dropAllLocks(exec)
80         , m_globalData(&exec->globalData())
81     {
82         resetCurrentIdentifierTable();
83         m_globalData->timeoutChecker->start();
84     }
85 
~APICallbackShim()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