dfg/DFGCompilationKey.h

   1 /*
   2  * Copyright (C) 2013, 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 DFGCompilationKey_h
  27 #define DFGCompilationKey_h
  28
  29 #include "DFGCompilationMode.h"
  30 #include <wtf/HashMap.h>
  31
  32 namespace JSC {
  33
  34 class CodeBlock;
  35 class CodeBlockSet;
  36
  37 namespace DFG {
  38
  39 class CompilationKey {
  40 public:
  41     CompilationKey()
  42         : m_profiledBlock(0)
  43         , m_mode(InvalidCompilationMode)
  44     {
  45     }
  46
  47     CompilationKey(WTF::HashTableDeletedValueType)
  48         : m_profiledBlock(0)
  49         , m_mode(DFGMode)
  50     {
  51     }
  52
  53     CompilationKey(CodeBlock* profiledBlock, CompilationMode mode)
  54         : m_profiledBlock(profiledBlock)
  55         , m_mode(mode)
  56     {
  57     }
  58
  59     bool operator!() const
  60     {
  61         return !m_profiledBlock && m_mode == InvalidCompilationMode;
  62     }
  63
  64     bool isHashTableDeletedValue() const
  65     {
  66         return !m_profiledBlock && m_mode != InvalidCompilationMode;
  67     }
  68
  69     CodeBlock* profiledBlock() const { return m_profiledBlock; }
  70     CompilationMode mode() const { return m_mode; }
  71
  72     bool operator==(const CompilationKey& other) const
  73     {
  74         return m_profiledBlock == other.m_profiledBlock
  75             && m_mode == other.m_mode;
  76     }
  77
  78     unsigned hash() const
  79     {
  80         return WTF::pairIntHash(WTF::PtrHash<CodeBlock*>::hash(m_profiledBlock), m_mode);
  81     }
  82
  83     void dump(PrintStream&) const;
  84
  85 private:
  86     CodeBlock* m_profiledBlock;
  87     CompilationMode m_mode;
  88 };
  89
  90 struct CompilationKeyHash {
  91     static unsigned hash(const CompilationKey& key) { return key.hash(); }
  92     static bool equal(const CompilationKey& a, const CompilationKey& b) { return a == b; }
  93     static const bool safeToCompareToEmptyOrDeleted = true;
  94 };
  95
  96 } } // namespace JSC::DFG
  97
  98 namespace WTF {
  99
 100 template<typename T> struct DefaultHash;
 101 template<> struct DefaultHash<JSC::DFG::CompilationKey> {
 102     typedef JSC::DFG::CompilationKeyHash Hash;
 103 };
 104
 105 template<typename T> struct HashTraits;
 106 template<> struct HashTraits<JSC::DFG::CompilationKey> : SimpleClassHashTraits<JSC::DFG::CompilationKey> { };
 107
 108 } // namespace WTF
 109
 110 #endif // DFGCompilationKey_h
 111