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
34namespace JSC {
35
36ASSERT_CLASS_FITS_IN_CELL(JSPropertyNameIterator);
37
38JSPropertyNameIterator* 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
74JSValue 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
85void JSPropertyNameIterator::markChildren(MarkStack& markStack)
86{
87 markStack.appendValues(values: m_jsStrings.get(), count: m_jsStringsSize, properties: MayContainNullValues);
88}
89
90} // namespace JSC
91

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