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 48using namespace std; 49 50namespace JSC { 51 52// Number of ticks before the first timeout check is done. 53static const int ticksUntilFirstCheck = 1024; 54 55// Number of milliseconds between each timeout check. 56static const int intervalBetweenChecks = 1000; 57 58// Returns the time the current thread has spent executing, in milliseconds. 59static 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 OS(SYMBIAN) 88 RThread current; 89 TTimeIntervalMicroSeconds cpuTime; 90 91 TInt err = current.GetCpuTime(cpuTime); 92 ASSERT_WITH_MESSAGE(err == KErrNone, "GetCpuTime failed with %d", err); 93 return cpuTime.Int64() / 1000; 94#elif PLATFORM(BREWMP) 95 // This function returns a continuously and linearly increasing millisecond 96 // timer from the time the device was powered on. 97 // There is only one thread in BREW, so this is enough. 98 return GETUPTIMEMS(); 99#else 100 // FIXME: We should return the time the current thread has spent executing. 101 102 // use a relative time from first call in order to avoid an overflow 103 static double firstTime = currentTime(); 104 return static_cast<unsigned> ((currentTime() - firstTime) * 1000); 105#endif 106} 107 108TimeoutChecker::TimeoutChecker() 109 : m_timeoutInterval(0) 110 , m_startCount(0) 111{ 112 reset(); 113} 114 115void TimeoutChecker::reset() 116{ 117 m_ticksUntilNextCheck = ticksUntilFirstCheck; 118 m_timeAtLastCheck = 0; 119 m_timeExecuting = 0; 120} 121 122bool TimeoutChecker::didTimeOut(ExecState* exec) 123{ 124 unsigned currentTime = getCPUTime(); 125 126 if (!m_timeAtLastCheck) { 127 // Suspicious amount of looping in a script -- start timing it 128 m_timeAtLastCheck = currentTime; 129 return false; 130 } 131 132 unsigned timeDiff = currentTime - m_timeAtLastCheck; 133 134 if (timeDiff == 0) 135 timeDiff = 1; 136 137 m_timeExecuting += timeDiff; 138 m_timeAtLastCheck = currentTime; 139 140 // Adjust the tick threshold so we get the next checkTimeout call in the 141 // interval specified in intervalBetweenChecks. 142 m_ticksUntilNextCheck = static_cast<unsigned>((static_cast<float>(intervalBetweenChecks) / timeDiff) * m_ticksUntilNextCheck); 143 // If the new threshold is 0 reset it to the default threshold. This can happen if the timeDiff is higher than the 144 // preferred script check time interval. 145 if (m_ticksUntilNextCheck == 0) 146 m_ticksUntilNextCheck = ticksUntilFirstCheck; 147 148 if (m_timeoutInterval && m_timeExecuting > m_timeoutInterval) { 149 if (exec->dynamicGlobalObject()->shouldInterruptScript()) 150 return true; 151 152 reset(); 153 } 154 155 return false; 156} 157 158} // namespace JSC 159