1/*
2 * Copyright (C) 2016 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#pragma once
27
28#include "JSCJSValue.h"
29#include <wtf/PrintStream.h>
30
31namespace JSC { namespace Profiler {
32
33class UID {
34public:
35 UID()
36 : m_uid(0)
37 {
38 }
39
40 static UID fromInt(uint64_t value)
41 {
42 UID result;
43 result.m_uid = value;
44 return result;
45 }
46
47 UID(WTF::HashTableDeletedValueType)
48 : m_uid(std::numeric_limits<uint64_t>::max())
49 {
50 }
51
52 static UID create();
53
54 uint64_t toInt() const
55 {
56 return m_uid;
57 }
58
59 bool operator==(const UID& other) const
60 {
61 return m_uid == other.m_uid;
62 }
63
64 bool operator!=(const UID& other) const
65 {
66 return !(*this == other);
67 }
68
69 explicit operator bool() const
70 {
71 return *this != UID();
72 }
73
74 bool isHashTableDeletedValue() const
75 {
76 return *this != UID(WTF::HashTableDeletedValue);
77 }
78
79 unsigned hash() const
80 {
81 return IntHash<uint64_t>::hash(m_uid);
82 }
83
84 void dump(PrintStream&) const;
85 JSValue toJS(ExecState*) const;
86
87private:
88 uint64_t m_uid;
89};
90
91struct UIDHash {
92 static unsigned hash(const UID& key) { return key.hash(); }
93 static bool equal(const UID& a, const UID& b) { return a == b; }
94 static const bool safeToCompareToEmptyOrDeleted = true;
95};
96
97} } // namespace JSC::Profiler
98
99namespace WTF {
100
101template<typename T> struct DefaultHash;
102template<> struct DefaultHash<JSC::Profiler::UID> {
103 typedef JSC::Profiler::UIDHash Hash;
104};
105
106template<typename T> struct HashTraits;
107template<> struct HashTraits<JSC::Profiler::UID> : SimpleClassHashTraits<JSC::Profiler::UID> { };
108
109} // namespace WTF
110