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1 /* |
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2 * Copyright (C) 2008 Apple Inc. All rights reserved. |
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3 * |
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4 * Redistribution and use in source and binary forms, with or without |
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5 * modification, are permitted provided that the following conditions |
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6 * are met: |
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7 * |
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8 * 1. Redistributions of source code must retain the above copyright |
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9 * notice, this list of conditions and the following disclaimer. |
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10 * 2. Redistributions in binary form must reproduce the above copyright |
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11 * notice, this list of conditions and the following disclaimer in the |
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12 * documentation and/or other materials provided with the distribution. |
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13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
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14 * its contributors may be used to endorse or promote products derived |
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15 * from this software without specific prior written permission. |
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16 * |
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17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
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18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
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21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 */ |
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28 |
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29 #ifndef RegisterID_h |
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30 #define RegisterID_h |
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31 |
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32 #include <wtf/Assertions.h> |
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33 #include <wtf/Noncopyable.h> |
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34 #include <wtf/VectorTraits.h> |
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35 |
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36 namespace JSC { |
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37 |
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38 class RegisterID : public Noncopyable { |
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39 public: |
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40 RegisterID() |
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41 : m_refCount(0) |
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42 , m_isTemporary(false) |
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43 #ifndef NDEBUG |
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44 , m_didSetIndex(false) |
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45 #endif |
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46 { |
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47 } |
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48 |
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49 explicit RegisterID(int index) |
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50 : m_refCount(0) |
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51 , m_index(index) |
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52 , m_isTemporary(false) |
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53 #ifndef NDEBUG |
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54 , m_didSetIndex(true) |
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55 #endif |
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56 { |
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57 } |
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58 |
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59 void setIndex(int index) |
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60 { |
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61 ASSERT(!m_refCount); |
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62 #ifndef NDEBUG |
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63 m_didSetIndex = true; |
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64 #endif |
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65 m_index = index; |
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66 } |
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67 |
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68 void setTemporary() |
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69 { |
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70 m_isTemporary = true; |
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71 } |
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72 |
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73 int index() const |
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74 { |
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75 ASSERT(m_didSetIndex); |
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76 return m_index; |
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77 } |
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78 |
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79 bool isTemporary() |
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80 { |
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81 return m_isTemporary; |
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82 } |
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83 |
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84 void ref() |
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85 { |
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86 ++m_refCount; |
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87 } |
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88 |
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89 void deref() |
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90 { |
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91 --m_refCount; |
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92 ASSERT(m_refCount >= 0); |
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93 } |
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94 |
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95 int refCount() const |
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96 { |
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97 return m_refCount; |
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98 } |
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99 |
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100 private: |
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101 |
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102 int m_refCount; |
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103 int m_index; |
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104 bool m_isTemporary; |
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105 #ifndef NDEBUG |
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106 bool m_didSetIndex; |
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107 #endif |
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108 }; |
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109 |
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110 } // namespace JSC |
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111 |
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112 namespace WTF { |
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113 |
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114 template<> struct VectorTraits<JSC::RegisterID> : VectorTraitsBase<true, JSC::RegisterID> { |
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115 static const bool needsInitialization = true; |
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116 static const bool canInitializeWithMemset = true; // Default initialization just sets everything to 0 or false, so this is safe. |
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117 }; |
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118 |
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119 } // namespace WTF |
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120 |
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121 #endif // RegisterID_h |