1/* 2 * Copyright (C) 2013 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 HandleBlock_h 27#define HandleBlock_h 28 29#include "HeapBlock.h" 30 31namespace JSC { 32 33class DeadBlock; 34class HandleSet; 35class HandleNode; 36 37class HandleBlock : public HeapBlock<HandleBlock> { 38public: 39 static HandleBlock* create(DeadBlock*, HandleSet*); 40 static HandleBlock* blockFor(HandleNode*); 41 42 static const size_t blockSize = 4 * KB; 43 44 HandleSet* handleSet(); 45 46 HandleNode* nodes(); 47 HandleNode* nodeAtIndex(unsigned); 48 unsigned nodeCapacity(); 49 50private: 51 HandleBlock(Region*, HandleSet*); 52 53 char* payload(); 54 char* payloadEnd(); 55 56 static const size_t s_blockMask = ~(blockSize - 1); 57 58 HandleSet* m_handleSet; 59}; 60 61inline HandleBlock* HandleBlock::blockFor(HandleNode* node) 62{ 63 return reinterpret_cast<HandleBlock*>(reinterpret_cast<size_t>(node) & s_blockMask); 64} 65 66inline HandleSet* HandleBlock::handleSet() 67{ 68 return m_handleSet; 69} 70 71} // namespace JSC 72 73#endif // HandleBlock_h 74