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      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/VectorTraits.h>
     34 
     35 namespace JSC {
     36 
     37     class RegisterID {
     38         WTF_MAKE_NONCOPYABLE(RegisterID);
     39     public:
     40         RegisterID()
     41             : m_refCount(0)
     42             , m_isTemporary(false)
     43 #ifndef NDEBUG
     44             , m_didSetIndex(false)
     45 #endif
     46         {
     47         }
     48 
     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 
     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 
     68         void setTemporary()
     69         {
     70             m_isTemporary = true;
     71         }
     72 
     73         int index() const
     74         {
     75             ASSERT(m_didSetIndex);
     76             return m_index;
     77         }
     78 
     79         bool isTemporary()
     80         {
     81             return m_isTemporary;
     82         }
     83 
     84         void ref()
     85         {
     86             ++m_refCount;
     87         }
     88 
     89         void deref()
     90         {
     91             --m_refCount;
     92             ASSERT(m_refCount >= 0);
     93         }
     94 
     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