1/*
2 * Copyright (C) 2013-2017 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 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 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#pragma once
27
28#include <wtf/Lock.h>
29#include <wtf/MonotonicTime.h>
30#include <wtf/Ref.h>
31#include <wtf/ThreadSafeRefCounted.h>
32#include <wtf/WorkQueue.h>
33
34namespace JSC {
35
36class ExecState;
37class VM;
38
39class Watchdog : public WTF::ThreadSafeRefCounted<Watchdog> {
40 WTF_MAKE_FAST_ALLOCATED;
41public:
42 class Scope;
43
44 Watchdog(VM*);
45 void willDestroyVM(VM*);
46
47 typedef bool (*ShouldTerminateCallback)(ExecState*, void* data1, void* data2);
48 void setTimeLimit(Seconds limit, ShouldTerminateCallback = 0, void* data1 = 0, void* data2 = 0);
49
50 bool shouldTerminate(ExecState*);
51
52 bool hasTimeLimit();
53 void enteredVM();
54 void exitedVM();
55
56 static const Seconds noTimeLimit;
57
58private:
59 void startTimer(Seconds timeLimit);
60 void stopTimer();
61
62 bool m_hasEnteredVM { false };
63
64 Lock m_lock; // Guards access to m_vm.
65 VM* m_vm;
66
67 Seconds m_timeLimit;
68
69 Seconds m_cpuDeadline;
70 MonotonicTime m_deadline;
71
72 ShouldTerminateCallback m_callback;
73 void* m_callbackData1;
74 void* m_callbackData2;
75
76 Ref<WorkQueue> m_timerQueue;
77
78 friend class LLIntOffsetsExtractor;
79};
80
81} // namespace JSC
82