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
34namespace JSC {
35
36class APIEntryShimWithoutLock {
37protected:
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
57private:
58    JSGlobalData* m_globalData;
59    IdentifierTable* m_entryIdentifierTable;
60};
61
62class APIEntryShim : public APIEntryShimWithoutLock {
63public:
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
78private:
79    JSLock m_lock;
80};
81
82class APICallbackShim {
83public:
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
97private:
98    JSLock::DropAllLocks m_dropAllLocks;
99    JSGlobalData* m_globalData;
100};
101
102}
103
104#endif
105