1/* 2 * Copyright (C) 2011, 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 * 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#ifndef WTF_MetaAllocatorHandle_h 30#define WTF_MetaAllocatorHandle_h 31 32#include <wtf/Assertions.h> 33#include <wtf/RedBlackTree.h> 34#include <wtf/ThreadSafeRefCounted.h> 35#include <wtf/RefPtr.h> 36 37namespace WTF { 38 39class MetaAllocator; 40 41class MetaAllocatorHandle : public ThreadSafeRefCounted<MetaAllocatorHandle>, public RedBlackTree<MetaAllocatorHandle, void*>::Node { 42private: 43 MetaAllocatorHandle(MetaAllocator*, void* start, size_t sizeInBytes, void* ownerUID); 44 45public: 46 WTF_EXPORT_PRIVATE ~MetaAllocatorHandle(); 47 48 void* start() const 49 { 50 return m_start; 51 } 52 53 void* end() const 54 { 55 return reinterpret_cast<void*>(endAsInteger()); 56 } 57 58 uintptr_t startAsInteger() const 59 { 60 return reinterpret_cast<uintptr_t>(m_start); 61 } 62 63 uintptr_t endAsInteger() const 64 { 65 return startAsInteger() + m_sizeInBytes; 66 } 67 68 size_t sizeInBytes() const 69 { 70 return m_sizeInBytes; 71 } 72 73 bool containsIntegerAddress(uintptr_t address) const 74 { 75 return address - startAsInteger() < sizeInBytes(); 76 } 77 78 bool contains(void* address) const 79 { 80 return containsIntegerAddress(reinterpret_cast<uintptr_t>(address)); 81 } 82 83 WTF_EXPORT_PRIVATE void shrink(size_t newSizeInBytes); 84 85 bool isManaged() 86 { 87 return !!m_allocator; 88 } 89 90 MetaAllocator* allocator() 91 { 92 ASSERT(m_allocator); 93 return m_allocator; 94 } 95 96 void* ownerUID() 97 { 98 return m_ownerUID; 99 } 100 101 void* key() 102 { 103 return m_start; 104 } 105 106private: 107 friend class MetaAllocator; 108 109 MetaAllocator* m_allocator; 110 void* m_start; 111 size_t m_sizeInBytes; 112 void* m_ownerUID; 113}; 114 115} 116 117#endif 118