1/* 2 * Copyright (C) 2012 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. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef CopyVisitor_h 27#define CopyVisitor_h 28 29#include "CopiedSpace.h" 30 31namespace JSC { 32 33class GCThreadSharedData; 34class JSCell; 35 36class CopyVisitor { 37public: 38 CopyVisitor(GCThreadSharedData&); 39 40 void copyFromShared(); 41 42 void startCopying(); 43 void doneCopying(); 44 45 // Low-level API for copying, appropriate for cases where the object's heap references 46 // are discontiguous or if the object occurs frequently enough that you need to focus on 47 // performance. Use this with care as it is easy to shoot yourself in the foot. 48 bool checkIfShouldCopy(void*); 49 void* allocateNewSpace(size_t); 50 void didCopy(void*, size_t); 51 52private: 53 void* allocateNewSpaceSlow(size_t); 54 void visitItem(CopyWorklistItem); 55 56 GCThreadSharedData& m_shared; 57 CopiedAllocator m_copiedAllocator; 58}; 59 60} // namespace JSC 61 62#endif 63