1/* 2 * Copyright (C) 2009, 2011 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#ifndef GCThreadSharedData_h 27#define GCThreadSharedData_h 28 29#include "ListableHandler.h" 30#include "MarkStack.h" 31#include "MarkedBlock.h" 32#include "UnconditionalFinalizer.h" 33#include "WeakReferenceHarvester.h" 34#include <condition_variable> 35#include <wtf/HashSet.h> 36#include <wtf/TCSpinLock.h> 37#include <wtf/Vector.h> 38 39namespace JSC { 40 41class GCThread; 42class VM; 43class CopiedSpace; 44class CopyVisitor; 45 46enum GCPhase { 47 NoPhase, 48 Mark, 49 Copy, 50 Exit 51}; 52 53class GCThreadSharedData { 54 WTF_MAKE_FAST_ALLOCATED; 55public: 56 GCThreadSharedData(VM*); 57 ~GCThreadSharedData(); 58 59 void reset(); 60 61 void didStartMarking(); 62 void didFinishMarking(); 63 void didStartCopying(); 64 void didFinishCopying(); 65 66#if ENABLE(PARALLEL_GC) 67 void resetChildren(); 68 size_t childVisitCount(); 69 size_t childBytesVisited(); 70 size_t childBytesCopied(); 71 size_t childDupStrings(); 72#endif 73 74private: 75 friend class GCThread; 76 friend class SlotVisitor; 77 friend class CopyVisitor; 78 79 void getNextBlocksToCopy(size_t&, size_t&); 80 void startNextPhase(GCPhase); 81 void endCurrentPhase(); 82 83 VM* m_vm; 84 CopiedSpace* m_copiedSpace; 85 86 bool m_shouldHashCons; 87 88 Vector<GCThread*> m_gcThreads; 89 90 std::mutex m_markingMutex; 91 std::condition_variable m_markingConditionVariable; 92 MarkStackArray m_sharedMarkStack; 93 unsigned m_numberOfActiveParallelMarkers; 94 bool m_parallelMarkersShouldExit; 95 96 std::mutex m_opaqueRootsMutex; 97 HashSet<void*> m_opaqueRoots; 98 99 SpinLock m_copyLock; 100 Vector<CopiedBlock*> m_blocksToCopy; 101 size_t m_copyIndex; 102 static const size_t s_blockFragmentLength = 32; 103 104 std::mutex m_phaseMutex; 105 std::condition_variable m_phaseConditionVariable; 106 std::condition_variable m_activityConditionVariable; 107 unsigned m_numberOfActiveGCThreads; 108 bool m_gcThreadsShouldWait; 109 GCPhase m_currentPhase; 110 111 ListableHandler<WeakReferenceHarvester>::List m_weakReferenceHarvesters; 112 ListableHandler<UnconditionalFinalizer>::List m_unconditionalFinalizers; 113}; 114 115inline void GCThreadSharedData::getNextBlocksToCopy(size_t& start, size_t& end) 116{ 117 SpinLockHolder locker(&m_copyLock); 118 start = m_copyIndex; 119 end = std::min(m_blocksToCopy.size(), m_copyIndex + s_blockFragmentLength); 120 m_copyIndex = end; 121} 122 123} // namespace JSC 124 125#endif 126