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