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 const ClassInfo JSPropertyNameIterator::s_info = { "JSPropertyNameIterator", 0, 0, 0 };
39
JSPropertyNameIterator(ExecState * exec,PropertyNameArrayData * propertyNameArrayData,size_t numCacheableSlots)40 inline JSPropertyNameIterator::JSPropertyNameIterator(ExecState* exec, PropertyNameArrayData* propertyNameArrayData, size_t numCacheableSlots)
41 : JSCell(exec->globalData(), exec->globalData().propertyNameIteratorStructure.get())
42 , m_numCacheableSlots(numCacheableSlots)
43 , m_jsStringsSize(propertyNameArrayData->propertyNameVector().size())
44 , m_jsStrings(adoptArrayPtr(new WriteBarrier<Unknown>[m_jsStringsSize]))
45 {
46 PropertyNameArrayData::PropertyNameVector& propertyNameVector = propertyNameArrayData->propertyNameVector();
47 for (size_t i = 0; i < m_jsStringsSize; ++i)
48 m_jsStrings[i].set(exec->globalData(), this, jsOwnedString(exec, propertyNameVector[i].ustring()));
49 }
50
create(ExecState * exec,JSObject * o)51 JSPropertyNameIterator* JSPropertyNameIterator::create(ExecState* exec, JSObject* o)
52 {
53 ASSERT(!o->structure()->enumerationCache() ||
54 o->structure()->enumerationCache()->cachedStructure() != o->structure() ||
55 o->structure()->enumerationCache()->cachedPrototypeChain() != o->structure()->prototypeChain(exec));
56
57 PropertyNameArray propertyNames(exec);
58 o->getPropertyNames(exec, propertyNames);
59 size_t numCacheableSlots = 0;
60 if (!o->structure()->hasNonEnumerableProperties() && !o->structure()->hasAnonymousSlots() &&
61 !o->structure()->hasGetterSetterProperties() && !o->structure()->isUncacheableDictionary() &&
62 !o->structure()->typeInfo().overridesGetPropertyNames())
63 numCacheableSlots = o->structure()->propertyStorageSize();
64
65 JSPropertyNameIterator* jsPropertyNameIterator = new (exec) JSPropertyNameIterator(exec, propertyNames.data(), numCacheableSlots);
66
67 if (o->structure()->isDictionary())
68 return jsPropertyNameIterator;
69
70 if (o->structure()->typeInfo().overridesGetPropertyNames())
71 return jsPropertyNameIterator;
72
73 size_t count = normalizePrototypeChain(exec, o);
74 StructureChain* structureChain = o->structure()->prototypeChain(exec);
75 WriteBarrier<Structure>* structure = structureChain->head();
76 for (size_t i = 0; i < count; ++i) {
77 if (structure[i]->typeInfo().overridesGetPropertyNames())
78 return jsPropertyNameIterator;
79 }
80
81 jsPropertyNameIterator->setCachedPrototypeChain(exec->globalData(), structureChain);
82 jsPropertyNameIterator->setCachedStructure(exec->globalData(), o->structure());
83 o->structure()->setEnumerationCache(exec->globalData(), jsPropertyNameIterator);
84 return jsPropertyNameIterator;
85 }
86
get(ExecState * exec,JSObject * base,size_t i)87 JSValue JSPropertyNameIterator::get(ExecState* exec, JSObject* base, size_t i)
88 {
89 JSValue identifier = m_jsStrings[i].get();
90 if (m_cachedStructure.get() == base->structure() && m_cachedPrototypeChain.get() == base->structure()->prototypeChain(exec))
91 return identifier;
92
93 if (!base->hasProperty(exec, Identifier(exec, asString(identifier)->value(exec))))
94 return JSValue();
95 return identifier;
96 }
97
markChildren(MarkStack & markStack)98 void JSPropertyNameIterator::markChildren(MarkStack& markStack)
99 {
100 markStack.appendValues(m_jsStrings.get(), m_jsStringsSize, MayContainNullValues);
101 if (m_cachedPrototypeChain)
102 markStack.append(&m_cachedPrototypeChain);
103 }
104
105 } // namespace JSC
106