bytecompiler/StaticPropertyAnalysis.h

   1 /*
   2  * Copyright (C) 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  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef StaticPropertyAnalysis_h
  27 #define StaticPropertyAnalysis_h
  28
  29 #include "Executable.h"
  30 #include "JSGlobalObject.h"
  31 #include <wtf/HashSet.h>
  32
  33 namespace JSC {
  34
  35 // Reference count indicates number of live registers that alias this object.
  36 class StaticPropertyAnalysis : public RefCounted<StaticPropertyAnalysis> {
  37 public:
  38     static Ref<StaticPropertyAnalysis> create(Vector<UnlinkedInstruction, 0, UnsafeVectorOverflow>* instructions, unsigned target)
  39     {
  40         return adoptRef(*new StaticPropertyAnalysis(instructions, target));
  41     }
  42
  43     void addPropertyIndex(unsigned propertyIndex) { m_propertyIndexes.add(propertyIndex); }
  44
  45     void record()
  46     {
  47         (*m_instructions)[m_target] = m_propertyIndexes.size();
  48     }
  49
  50     int propertyIndexCount() { return m_propertyIndexes.size(); }
  51
  52 private:
  53     StaticPropertyAnalysis(Vector<UnlinkedInstruction, 0, UnsafeVectorOverflow>* instructions, unsigned target)
  54         : m_instructions(instructions)
  55         , m_target(target)
  56     {
  57     }
  58
  59     Vector<UnlinkedInstruction, 0, UnsafeVectorOverflow>* m_instructions;
  60     unsigned m_target;
  61     typedef HashSet<unsigned, WTF::IntHash<unsigned>, WTF::UnsignedWithZeroKeyHashTraits<unsigned>> PropertyIndexSet;
  62     PropertyIndexSet m_propertyIndexes;
  63 };
  64
  65 } // namespace JSC
  66
  67 #endif // StaticPropertyAnalysis_h