1/*
2 * Copyright (C) 2012 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. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "Identifier.h"
29#include "JSGlobalObjectFunctions.h"
30#include "PrivateName.h"
31#include <wtf/Optional.h>
32#include <wtf/dtoa.h>
33
34namespace JSC {
35
36class PropertyName {
37public:
38 PropertyName(UniquedStringImpl* propertyName)
39 : m_impl(propertyName)
40 {
41 }
42
43 PropertyName(const Identifier& propertyName)
44 : PropertyName(propertyName.impl())
45 {
46 }
47
48 PropertyName(const PrivateName& propertyName)
49 : m_impl(&propertyName.uid())
50 {
51 ASSERT(m_impl);
52 ASSERT(m_impl->isSymbol());
53 }
54
55 bool isNull() const { return !m_impl; }
56
57 bool isSymbol() const
58 {
59 return m_impl && m_impl->isSymbol();
60 }
61
62 bool isPrivateName() const
63 {
64 return isSymbol() && static_cast<const SymbolImpl*>(m_impl)->isPrivate();
65 }
66
67 UniquedStringImpl* uid() const
68 {
69 return m_impl;
70 }
71
72 AtomicStringImpl* publicName() const
73 {
74 return (!m_impl || m_impl->isSymbol()) ? nullptr : static_cast<AtomicStringImpl*>(m_impl);
75 }
76
77 void dump(PrintStream& out) const
78 {
79 if (m_impl)
80 out.print(m_impl);
81 else
82 out.print("<null property name>");
83 }
84
85private:
86 UniquedStringImpl* m_impl;
87};
88static_assert(sizeof(PropertyName) == sizeof(UniquedStringImpl*), "UniquedStringImpl* and PropertyName should be compatible to invoke easily from JIT code.");
89
90inline bool operator==(PropertyName a, const Identifier& b)
91{
92 return a.uid() == b.impl();
93}
94
95inline bool operator==(const Identifier& a, PropertyName b)
96{
97 return a.impl() == b.uid();
98}
99
100inline bool operator==(PropertyName a, PropertyName b)
101{
102 return a.uid() == b.uid();
103}
104
105inline bool operator==(PropertyName a, const char* b)
106{
107 return equal(a.uid(), b);
108}
109
110inline bool operator!=(PropertyName a, const Identifier& b)
111{
112 return a.uid() != b.impl();
113}
114
115inline bool operator!=(const Identifier& a, PropertyName b)
116{
117 return a.impl() != b.uid();
118}
119
120inline bool operator!=(PropertyName a, PropertyName b)
121{
122 return a.uid() != b.uid();
123}
124
125ALWAYS_INLINE Optional<uint32_t> parseIndex(PropertyName propertyName)
126{
127 auto uid = propertyName.uid();
128 if (!uid)
129 return WTF::nullopt;
130 if (uid->isSymbol())
131 return WTF::nullopt;
132 return parseIndex(*uid);
133}
134
135// https://www.ecma-international.org/ecma-262/9.0/index.html#sec-canonicalnumericindexstring
136ALWAYS_INLINE bool isCanonicalNumericIndexString(const PropertyName& propertyName)
137{
138 StringImpl* property = propertyName.uid();
139 if (!property)
140 return false;
141 if (property->isSymbol())
142 return false;
143 if (equal(property, "-0"))
144 return true;
145 double index = jsToNumber(property);
146 NumberToStringBuffer buffer;
147 const char* indexString = WTF::numberToString(index, buffer);
148 if (!equal(property, indexString))
149 return false;
150 return true;
151}
152
153} // namespace JSC
154