1/* 2 * Copyright (C) 2010 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 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include "config.h" 30#include "GCActivityCallback.h" 31 32#include "Heap.h" 33#include "JSLock.h" 34#include "JSObject.h" 35#include "VM.h" 36 37#include <wtf/RetainPtr.h> 38#include <wtf/WTFThreadData.h> 39 40#if PLATFORM(EFL) 41#include <wtf/MainThread.h> 42#endif 43 44namespace JSC { 45 46bool GCActivityCallback::s_shouldCreateGCTimer = true; 47 48#if USE(CF) || PLATFORM(EFL) 49 50const double timerSlop = 2.0; // Fudge factor to avoid performance cost of resetting timer. 51 52#if USE(CF) 53GCActivityCallback::GCActivityCallback(Heap* heap) 54 : GCActivityCallback(heap->vm(), CFRunLoopGetCurrent()) 55{ 56} 57 58GCActivityCallback::GCActivityCallback(Heap* heap, CFRunLoopRef runLoop) 59 : GCActivityCallback(heap->vm(), runLoop) 60{ 61} 62#elif PLATFORM(EFL) 63GCActivityCallback::GCActivityCallback(Heap* heap) 64 : GCActivityCallback(heap->vm(), WTF::isMainThread()) 65{ 66} 67#endif 68 69void GCActivityCallback::doWork() 70{ 71 Heap* heap = &m_vm->heap; 72 if (!isEnabled()) 73 return; 74 75 JSLockHolder locker(m_vm); 76 if (heap->isDeferred()) { 77 scheduleTimer(0); 78 return; 79 } 80 81 doCollection(); 82} 83 84#if USE(CF) 85void GCActivityCallback::scheduleTimer(double newDelay) 86{ 87 if (newDelay * timerSlop > m_delay) 88 return; 89 double delta = m_delay - newDelay; 90 m_delay = newDelay; 91 CFRunLoopTimerSetNextFireDate(m_timer.get(), CFRunLoopTimerGetNextFireDate(m_timer.get()) - delta); 92} 93 94void GCActivityCallback::cancelTimer() 95{ 96 m_delay = s_decade; 97 CFRunLoopTimerSetNextFireDate(m_timer.get(), CFAbsoluteTimeGetCurrent() + s_decade); 98} 99#elif PLATFORM(EFL) 100void GCActivityCallback::scheduleTimer(double newDelay) 101{ 102 if (newDelay * timerSlop > m_delay) 103 return; 104 105 stop(); 106 m_delay = newDelay; 107 108 ASSERT(!m_timer); 109 m_timer = add(newDelay, this); 110} 111 112void GCActivityCallback::cancelTimer() 113{ 114 m_delay = s_hour; 115 stop(); 116} 117#endif 118 119void GCActivityCallback::didAllocate(size_t bytes) 120{ 121#if PLATFORM(EFL) 122 if (!isEnabled()) 123 return; 124 125 ASSERT(WTF::isMainThread()); 126#endif 127 128 // The first byte allocated in an allocation cycle will report 0 bytes to didAllocate. 129 // We pretend it's one byte so that we don't ignore this allocation entirely. 130 if (!bytes) 131 bytes = 1; 132 double bytesExpectedToReclaim = static_cast<double>(bytes) * deathRate(); 133 double newDelay = lastGCLength() / gcTimeSlice(bytesExpectedToReclaim); 134 scheduleTimer(newDelay); 135} 136 137void GCActivityCallback::willCollect() 138{ 139 cancelTimer(); 140} 141 142void GCActivityCallback::cancel() 143{ 144 cancelTimer(); 145} 146 147#else 148 149GCActivityCallback::GCActivityCallback(Heap* heap) 150 : GCActivityCallback(heap->vm()) 151{ 152} 153 154void GCActivityCallback::doWork() 155{ 156} 157 158void GCActivityCallback::didAllocate(size_t) 159{ 160} 161 162void GCActivityCallback::willCollect() 163{ 164} 165 166void GCActivityCallback::cancel() 167{ 168} 169 170#endif 171 172} 173 174