1 /*
2 * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
3 * Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
15 * its contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "config.h"
31 #include "TimeoutChecker.h"
32
33 #include "CallFrame.h"
34 #include "JSGlobalObject.h"
35
36 #if OS(DARWIN)
37 #include <mach/mach.h>
38 #elif OS(WINDOWS)
39 #include <windows.h>
40 #else
41 #include "CurrentTime.h"
42 #endif
43
44 #if PLATFORM(BREWMP)
45 #include <AEEStdLib.h>
46 #endif
47
48 using namespace std;
49
50 namespace JSC {
51
52 // Number of ticks before the first timeout check is done.
53 static const int ticksUntilFirstCheck = 1024;
54
55 // Number of milliseconds between each timeout check.
56 static const int intervalBetweenChecks = 1000;
57
58 // Returns the time the current thread has spent executing, in milliseconds.
getCPUTime()59 static inline unsigned getCPUTime()
60 {
61 #if OS(DARWIN)
62 mach_msg_type_number_t infoCount = THREAD_BASIC_INFO_COUNT;
63 thread_basic_info_data_t info;
64
65 // Get thread information
66 mach_port_t threadPort = mach_thread_self();
67 thread_info(threadPort, THREAD_BASIC_INFO, reinterpret_cast<thread_info_t>(&info), &infoCount);
68 mach_port_deallocate(mach_task_self(), threadPort);
69
70 unsigned time = info.user_time.seconds * 1000 + info.user_time.microseconds / 1000;
71 time += info.system_time.seconds * 1000 + info.system_time.microseconds / 1000;
72
73 return time;
74 #elif OS(WINDOWS)
75 union {
76 FILETIME fileTime;
77 unsigned long long fileTimeAsLong;
78 } userTime, kernelTime;
79
80 // GetThreadTimes won't accept NULL arguments so we pass these even though
81 // they're not used.
82 FILETIME creationTime, exitTime;
83
84 GetThreadTimes(GetCurrentThread(), &creationTime, &exitTime, &kernelTime.fileTime, &userTime.fileTime);
85
86 return userTime.fileTimeAsLong / 10000 + kernelTime.fileTimeAsLong / 10000;
87 #elif PLATFORM(BREWMP)
88 // This function returns a continuously and linearly increasing millisecond
89 // timer from the time the device was powered on.
90 // There is only one thread in BREW, so this is enough.
91 return GETUPTIMEMS();
92 #else
93 // FIXME: We should return the time the current thread has spent executing.
94 return currentTime() * 1000;
95 #endif
96 }
97
TimeoutChecker()98 TimeoutChecker::TimeoutChecker()
99 : m_timeoutInterval(0)
100 , m_startCount(0)
101 {
102 reset();
103 }
104
reset()105 void TimeoutChecker::reset()
106 {
107 m_ticksUntilNextCheck = ticksUntilFirstCheck;
108 m_timeAtLastCheck = 0;
109 m_timeExecuting = 0;
110 }
111
didTimeOut(ExecState * exec)112 bool TimeoutChecker::didTimeOut(ExecState* exec)
113 {
114 unsigned currentTime = getCPUTime();
115
116 if (!m_timeAtLastCheck) {
117 // Suspicious amount of looping in a script -- start timing it
118 m_timeAtLastCheck = currentTime;
119 return false;
120 }
121
122 unsigned timeDiff = currentTime - m_timeAtLastCheck;
123
124 if (timeDiff == 0)
125 timeDiff = 1;
126
127 m_timeExecuting += timeDiff;
128 m_timeAtLastCheck = currentTime;
129
130 // Adjust the tick threshold so we get the next checkTimeout call in the
131 // interval specified in intervalBetweenChecks.
132 m_ticksUntilNextCheck = static_cast<unsigned>((static_cast<float>(intervalBetweenChecks) / timeDiff) * m_ticksUntilNextCheck);
133 // If the new threshold is 0 reset it to the default threshold. This can happen if the timeDiff is higher than the
134 // preferred script check time interval.
135 if (m_ticksUntilNextCheck == 0)
136 m_ticksUntilNextCheck = ticksUntilFirstCheck;
137
138 if (m_timeoutInterval && m_timeExecuting > m_timeoutInterval) {
139 if (exec->dynamicGlobalObject()->shouldInterruptScript())
140 return true;
141
142 reset();
143 }
144
145 return false;
146 }
147
148 } // namespace JSC
149