1/* 2 * Copyright (C) 2008 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 RegisterID_h 30#define RegisterID_h 31 32#include "VirtualRegister.h" 33 34#include <wtf/Assertions.h> 35#include <wtf/VectorTraits.h> 36 37namespace JSC { 38 39 class RegisterID { 40 WTF_MAKE_NONCOPYABLE(RegisterID); 41 public: 42 RegisterID() 43 : m_refCount(0) 44 , m_isTemporary(false) 45#ifndef NDEBUG 46 , m_didSetIndex(false) 47#endif 48 { 49 } 50 51 RegisterID(VirtualRegister virtualRegister) 52 : m_refCount(0) 53 , m_virtualRegister(virtualRegister) 54 , m_isTemporary(false) 55#ifndef NDEBUG 56 , m_didSetIndex(true) 57#endif 58 { 59 } 60 61 explicit RegisterID(int index) 62 : m_refCount(0) 63 , m_virtualRegister(VirtualRegister(index)) 64 , m_isTemporary(false) 65#ifndef NDEBUG 66 , m_didSetIndex(true) 67#endif 68 { 69 } 70 71 void setIndex(int index) 72 { 73 ASSERT(!m_refCount); 74#ifndef NDEBUG 75 m_didSetIndex = true; 76#endif 77 m_virtualRegister = VirtualRegister(index); 78 } 79 80 void setTemporary() 81 { 82 m_isTemporary = true; 83 } 84 85 int index() const 86 { 87 ASSERT(m_didSetIndex); 88 return m_virtualRegister.offset(); 89 } 90 91 VirtualRegister virtualRegister() const 92 { 93 ASSERT(m_virtualRegister.isValid()); 94 return m_virtualRegister; 95 } 96 97 bool isTemporary() 98 { 99 return m_isTemporary; 100 } 101 102 void ref() 103 { 104 ++m_refCount; 105 } 106 107 void deref() 108 { 109 --m_refCount; 110 ASSERT(m_refCount >= 0); 111 } 112 113 int refCount() const 114 { 115 return m_refCount; 116 } 117 118 private: 119 120 int m_refCount; 121 VirtualRegister m_virtualRegister; 122 bool m_isTemporary; 123#ifndef NDEBUG 124 bool m_didSetIndex; 125#endif 126 }; 127 128} // namespace JSC 129 130namespace WTF { 131 132 template<> struct VectorTraits<JSC::RegisterID> : VectorTraitsBase<true, JSC::RegisterID> { 133 static const bool needsInitialization = true; 134 static const bool canInitializeWithMemset = true; // Default initialization just sets everything to 0 or false, so this is safe. 135 }; 136 137} // namespace WTF 138 139#endif // RegisterID_h 140