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
32namespace JSC {
33
34class CodeBlock;
35class CodeBlockSet;
36
37namespace DFG {
38
39class CompilationKey {
40public:
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
85private:
86    CodeBlock* m_profiledBlock;
87    CompilationMode m_mode;
88};
89
90struct 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
98namespace WTF {
99
100template<typename T> struct DefaultHash;
101template<> struct DefaultHash<JSC::DFG::CompilationKey> {
102    typedef JSC::DFG::CompilationKeyHash Hash;
103};
104
105template<typename T> struct HashTraits;
106template<> struct HashTraits<JSC::DFG::CompilationKey> : SimpleClassHashTraits<JSC::DFG::CompilationKey> { };
107
108} // namespace WTF
109
110#endif // DFGCompilationKey_h
111
112