1 | /* |
2 | * Copyright (C) 2008, 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 | * |
8 | * 1. Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
13 | * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
14 | * its contributors may be used to endorse or promote products derived |
15 | * from this software without specific prior written permission. |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
18 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
19 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
20 | * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
21 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
22 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
23 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
24 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
28 | |
29 | #include "config.h" |
30 | #include "JSPropertyNameIterator.h" |
31 | |
32 | #include "JSGlobalObject.h" |
33 | |
34 | namespace JSC { |
35 | |
36 | ASSERT_CLASS_FITS_IN_CELL(JSPropertyNameIterator); |
37 | |
38 | JSPropertyNameIterator* JSPropertyNameIterator::create(ExecState* exec, JSObject* o) |
39 | { |
40 | ASSERT(!o->structure()->enumerationCache() || |
41 | o->structure()->enumerationCache()->cachedStructure() != o->structure() || |
42 | o->structure()->enumerationCache()->cachedPrototypeChain() != o->structure()->prototypeChain(exec)); |
43 | |
44 | PropertyNameArray propertyNames(exec); |
45 | o->getPropertyNames(exec, propertyNames); |
46 | size_t numCacheableSlots = 0; |
47 | if (!o->structure()->hasNonEnumerableProperties() && !o->structure()->hasAnonymousSlots() && |
48 | !o->structure()->hasGetterSetterProperties() && !o->structure()->isUncacheableDictionary() && |
49 | !o->structure()->typeInfo().overridesGetPropertyNames()) |
50 | numCacheableSlots = o->structure()->propertyStorageSize(); |
51 | |
52 | JSPropertyNameIterator* jsPropertyNameIterator = new (exec) JSPropertyNameIterator(exec, propertyNames.data(), numCacheableSlots); |
53 | |
54 | if (o->structure()->isDictionary()) |
55 | return jsPropertyNameIterator; |
56 | |
57 | if (o->structure()->typeInfo().overridesGetPropertyNames()) |
58 | return jsPropertyNameIterator; |
59 | |
60 | size_t count = normalizePrototypeChain(callFrame: exec, base: o); |
61 | StructureChain* structureChain = o->structure()->prototypeChain(exec); |
62 | RefPtr<Structure>* structure = structureChain->head(); |
63 | for (size_t i = 0; i < count; ++i) { |
64 | if (structure[i]->typeInfo().overridesGetPropertyNames()) |
65 | return jsPropertyNameIterator; |
66 | } |
67 | |
68 | jsPropertyNameIterator->setCachedPrototypeChain(structureChain); |
69 | jsPropertyNameIterator->setCachedStructure(o->structure()); |
70 | o->structure()->setEnumerationCache(jsPropertyNameIterator); |
71 | return jsPropertyNameIterator; |
72 | } |
73 | |
74 | JSValue JSPropertyNameIterator::get(ExecState* exec, JSObject* base, size_t i) |
75 | { |
76 | JSValue& identifier = m_jsStrings[i]; |
77 | if (m_cachedStructure == base->structure() && m_cachedPrototypeChain == base->structure()->prototypeChain(exec)) |
78 | return identifier; |
79 | |
80 | if (!base->hasProperty(exec, propertyName: Identifier(exec, asString(value: identifier)->value(exec)))) |
81 | return JSValue(); |
82 | return identifier; |
83 | } |
84 | |
85 | void JSPropertyNameIterator::markChildren(MarkStack& markStack) |
86 | { |
87 | markStack.appendValues(values: m_jsStrings.get(), count: m_jsStringsSize, properties: MayContainNullValues); |
88 | } |
89 | |
90 | } // namespace JSC |
91 | |