1/* 2 * Copyright (C) 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 HeapBlock_h 27#define HeapBlock_h 28 29#include <wtf/DoublyLinkedList.h> 30#include <wtf/StdLibExtras.h> 31 32namespace JSC { 33 34enum AllocationEffort { AllocationCanFail, AllocationMustSucceed }; 35 36class Region; 37 38template<typename T> 39class HeapBlock : public DoublyLinkedListNode<T> { 40 friend class WTF::DoublyLinkedListNode<T>; 41public: 42 static HeapBlock* destroy(HeapBlock* block) WARN_UNUSED_RETURN 43 { 44 static_cast<T*>(block)->~T(); 45 return block; 46 } 47 48 HeapBlock(Region* region) 49 : DoublyLinkedListNode<T>() 50 , m_region(region) 51 , m_prev(0) 52 , m_next(0) 53 { 54 ASSERT(m_region); 55 } 56 57 Region* region() const { return m_region; } 58 59private: 60 Region* m_region; 61 T* m_prev; 62 T* m_next; 63}; 64 65} // namespace JSC 66 67#endif 68