dfg/DFGObjectMaterializationData.h

   1 /*
   2  * Copyright (C) 2014 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 DFGObjectMaterializationData_h
  27 #define DFGObjectMaterializationData_h
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 #include <limits.h>
  32 #include <wtf/MathExtras.h>
  33 #include <wtf/PrintStream.h>
  34 #include <wtf/Vector.h>
  35
  36 namespace JSC { namespace DFG {
  37
  38 struct PhantomPropertyValue {
  39     PhantomPropertyValue()
  40         : m_identifierNumber(UINT_MAX)
  41     {
  42     }
  43
  44     PhantomPropertyValue(unsigned identifierNumber)
  45         : m_identifierNumber(identifierNumber)
  46     {
  47     }
  48
  49     unsigned m_identifierNumber;
  50
  51     bool operator==(const PhantomPropertyValue& other) const
  52     {
  53         return m_identifierNumber == other.m_identifierNumber;
  54     }
  55
  56     void dump(PrintStream&) const;
  57 };
  58
  59 struct ObjectMaterializationData {
  60     // Determines the meaning of the passed nodes.
  61     Vector<PhantomPropertyValue> m_properties;
  62
  63     void dump(PrintStream&) const;
  64
  65     // The fraction of my properties that the other data has.
  66     float oneWaySimilarityScore(const ObjectMaterializationData&) const;
  67
  68     // The minimum of the two possible one-way scores.
  69     float similarityScore(const ObjectMaterializationData&) const;
  70 };
  71
  72 } } // namespace JSC::DFG
  73
  74 #endif // ENABLE(DFG_JIT)
  75
  76 #endif // DFGObjectMaterializationData_h
  77