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 | |
35 | namespace JSC { |
36 | unsigned PropertyDescriptor::defaultAttributes = (DontDelete << 1) - 1; |
37 | |
38 | bool PropertyDescriptor::writable() const |
39 | { |
40 | ASSERT(!isAccessorDescriptor()); |
41 | return !(m_attributes & ReadOnly); |
42 | } |
43 | |
44 | bool PropertyDescriptor::enumerable() const |
45 | { |
46 | return !(m_attributes & DontEnum); |
47 | } |
48 | |
49 | bool PropertyDescriptor::configurable() const |
50 | { |
51 | return !(m_attributes & DontDelete); |
52 | } |
53 | |
54 | bool PropertyDescriptor::isDataDescriptor() const |
55 | { |
56 | return m_value || (m_seenAttributes & WritablePresent); |
57 | } |
58 | |
59 | bool PropertyDescriptor::isGenericDescriptor() const |
60 | { |
61 | return !isAccessorDescriptor() && !isDataDescriptor(); |
62 | } |
63 | |
64 | bool PropertyDescriptor::isAccessorDescriptor() const |
65 | { |
66 | return m_getter || m_setter; |
67 | } |
68 | |
69 | void PropertyDescriptor::setUndefined() |
70 | { |
71 | m_value = jsUndefined(); |
72 | m_attributes = ReadOnly | DontDelete | DontEnum; |
73 | } |
74 | |
75 | JSValue PropertyDescriptor::getter() const |
76 | { |
77 | ASSERT(isAccessorDescriptor()); |
78 | return m_getter; |
79 | } |
80 | |
81 | JSValue PropertyDescriptor::setter() const |
82 | { |
83 | ASSERT(isAccessorDescriptor()); |
84 | return m_setter; |
85 | } |
86 | |
87 | void 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 | |
104 | void 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 | |
115 | void PropertyDescriptor::setWritable(bool writable) |
116 | { |
117 | if (writable) |
118 | m_attributes &= ~ReadOnly; |
119 | else |
120 | m_attributes |= ReadOnly; |
121 | m_seenAttributes |= WritablePresent; |
122 | } |
123 | |
124 | void PropertyDescriptor::setEnumerable(bool enumerable) |
125 | { |
126 | if (enumerable) |
127 | m_attributes &= ~DontEnum; |
128 | else |
129 | m_attributes |= DontEnum; |
130 | m_seenAttributes |= EnumerablePresent; |
131 | } |
132 | |
133 | void PropertyDescriptor::setConfigurable(bool configurable) |
134 | { |
135 | if (configurable) |
136 | m_attributes &= ~DontDelete; |
137 | else |
138 | m_attributes |= DontDelete; |
139 | m_seenAttributes |= ConfigurablePresent; |
140 | } |
141 | |
142 | void PropertyDescriptor::setSetter(JSValue setter) |
143 | { |
144 | m_setter = setter; |
145 | m_attributes |= Setter; |
146 | m_attributes &= ~ReadOnly; |
147 | } |
148 | |
149 | void PropertyDescriptor::setGetter(JSValue getter) |
150 | { |
151 | m_getter = getter; |
152 | m_attributes |= Getter; |
153 | m_attributes &= ~ReadOnly; |
154 | } |
155 | |
156 | bool 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 | |
168 | bool 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 | |
181 | unsigned 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 | |