1/*
2 * Copyright (C) 2009 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
27#include "config.h"
28
29#include "PropertyDescriptor.h"
30
31#include "GetterSetter.h"
32#include "JSObject.h"
33#include "Operations.h"
34
35namespace JSC {
36unsigned PropertyDescriptor::defaultAttributes = (DontDelete << 1) - 1;
37
38bool PropertyDescriptor::writable() const
39{
40 ASSERT(!isAccessorDescriptor());
41 return !(m_attributes & ReadOnly);
42}
43
44bool PropertyDescriptor::enumerable() const
45{
46 return !(m_attributes & DontEnum);
47}
48
49bool PropertyDescriptor::configurable() const
50{
51 return !(m_attributes & DontDelete);
52}
53
54bool PropertyDescriptor::isDataDescriptor() const
55{
56 return m_value || (m_seenAttributes & WritablePresent);
57}
58
59bool PropertyDescriptor::isGenericDescriptor() const
60{
61 return !isAccessorDescriptor() && !isDataDescriptor();
62}
63
64bool PropertyDescriptor::isAccessorDescriptor() const
65{
66 return m_getter || m_setter;
67}
68
69void PropertyDescriptor::setUndefined()
70{
71 m_value = jsUndefined();
72 m_attributes = ReadOnly | DontDelete | DontEnum;
73}
74
75JSValue PropertyDescriptor::getter() const
76{
77 ASSERT(isAccessorDescriptor());
78 return m_getter;
79}
80
81JSValue PropertyDescriptor::setter() const
82{
83 ASSERT(isAccessorDescriptor());
84 return m_setter;
85}
86
87void PropertyDescriptor::setDescriptor(JSValue value, unsigned attributes)
88{
89 ASSERT(value);
90 m_attributes = attributes;
91 if (attributes & (Getter | Setter)) {
92 GetterSetter* accessor = asGetterSetter(value);
93 m_getter = accessor->getter();
94 m_setter = accessor->setter();
95 ASSERT(m_getter || m_setter);
96 m_seenAttributes = EnumerablePresent | ConfigurablePresent;
97 m_attributes &= ~ReadOnly;
98 } else {
99 m_value = value;
100 m_seenAttributes = EnumerablePresent | ConfigurablePresent | WritablePresent;
101 }
102}
103
104void PropertyDescriptor::setAccessorDescriptor(JSValue getter, JSValue setter, unsigned attributes)
105{
106 ASSERT(attributes & (Getter | Setter));
107 ASSERT(getter || setter);
108 m_attributes = attributes;
109 m_getter = getter;
110 m_setter = setter;
111 m_attributes &= ~ReadOnly;
112 m_seenAttributes = EnumerablePresent | ConfigurablePresent;
113}
114
115void PropertyDescriptor::setWritable(bool writable)
116{
117 if (writable)
118 m_attributes &= ~ReadOnly;
119 else
120 m_attributes |= ReadOnly;
121 m_seenAttributes |= WritablePresent;
122}
123
124void PropertyDescriptor::setEnumerable(bool enumerable)
125{
126 if (enumerable)
127 m_attributes &= ~DontEnum;
128 else
129 m_attributes |= DontEnum;
130 m_seenAttributes |= EnumerablePresent;
131}
132
133void PropertyDescriptor::setConfigurable(bool configurable)
134{
135 if (configurable)
136 m_attributes &= ~DontDelete;
137 else
138 m_attributes |= DontDelete;
139 m_seenAttributes |= ConfigurablePresent;
140}
141
142void PropertyDescriptor::setSetter(JSValue setter)
143{
144 m_setter = setter;
145 m_attributes |= Setter;
146 m_attributes &= ~ReadOnly;
147}
148
149void PropertyDescriptor::setGetter(JSValue getter)
150{
151 m_getter = getter;
152 m_attributes |= Getter;
153 m_attributes &= ~ReadOnly;
154}
155
156bool PropertyDescriptor::equalTo(ExecState* exec, const PropertyDescriptor& other) const
157{
158 if (!other.m_value == m_value ||
159 !other.m_getter == m_getter ||
160 !other.m_setter == m_setter)
161 return false;
162 return (!m_value || JSValue::strictEqual(exec, v1: other.m_value, v2: m_value)) &&
163 (!m_getter || JSValue::strictEqual(exec, v1: other.m_getter, v2: m_getter)) &&
164 (!m_setter || JSValue::strictEqual(exec, v1: other.m_setter, v2: m_setter)) &&
165 attributesEqual(other);
166}
167
168bool PropertyDescriptor::attributesEqual(const PropertyDescriptor& other) const
169{
170 unsigned mismatch = other.m_attributes ^ m_attributes;
171 unsigned sharedSeen = other.m_seenAttributes & m_seenAttributes;
172 if (sharedSeen & WritablePresent && mismatch & ReadOnly)
173 return false;
174 if (sharedSeen & ConfigurablePresent && mismatch & DontDelete)
175 return false;
176 if (sharedSeen & EnumerablePresent && mismatch & DontEnum)
177 return false;
178 return true;
179}
180
181unsigned PropertyDescriptor::attributesWithOverride(const PropertyDescriptor& other) const
182{
183 unsigned mismatch = other.m_attributes ^ m_attributes;
184 unsigned sharedSeen = other.m_seenAttributes & m_seenAttributes;
185 unsigned newAttributes = m_attributes & defaultAttributes;
186 if (sharedSeen & WritablePresent && mismatch & ReadOnly)
187 newAttributes ^= ReadOnly;
188 if (sharedSeen & ConfigurablePresent && mismatch & DontDelete)
189 newAttributes ^= DontDelete;
190 if (sharedSeen & EnumerablePresent && mismatch & DontEnum)
191 newAttributes ^= DontEnum;
192 return newAttributes;
193}
194
195}
196

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/runtime/PropertyDescriptor.cpp