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      1 /*
      2  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
      3  * Copyright (C) 2008 Cameron Zwarich <cwzwarich (at) 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.
     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 
     98 TimeoutChecker::TimeoutChecker()
     99     : m_timeoutInterval(0)
    100     , m_startCount(0)
    101 {
    102     reset();
    103 }
    104 
    105 void TimeoutChecker::reset()
    106 {
    107     m_ticksUntilNextCheck = ticksUntilFirstCheck;
    108     m_timeAtLastCheck = 0;
    109     m_timeExecuting = 0;
    110 }
    111 
    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