/* | |
* Copyright (C) 2008, 2009 Apple Inc. All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions | |
* are met: | |
* | |
* 1. Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* 2. Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | |
* its contributors may be used to endorse or promote products derived | |
* from this software without specific prior written permission. | |
* | |
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | |
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
*/ | |
#include "config.h" | |
#include "JSPropertyNameIterator.h" | |
#include "JSGlobalObject.h" | |
namespace JSC { | |
ASSERT_CLASS_FITS_IN_CELL(JSPropertyNameIterator); | |
JSPropertyNameIterator* JSPropertyNameIterator::create(ExecState* exec, JSObject* o) | |
{ | |
ASSERT(!o->structure()->enumerationCache() || | |
o->structure()->enumerationCache()->cachedStructure() != o->structure() || | |
o->structure()->enumerationCache()->cachedPrototypeChain() != o->structure()->prototypeChain(exec)); | |
PropertyNameArray propertyNames(exec); | |
o->getPropertyNames(exec, propertyNames); | |
size_t numCacheableSlots = 0; | |
if (!o->structure()->hasNonEnumerableProperties() && !o->structure()->hasAnonymousSlots() && | |
!o->structure()->hasGetterSetterProperties() && !o->structure()->isUncacheableDictionary() && | |
!o->structure()->typeInfo().overridesGetPropertyNames()) | |
numCacheableSlots = o->structure()->propertyStorageSize(); | |
JSPropertyNameIterator* jsPropertyNameIterator = new (exec) JSPropertyNameIterator(exec, propertyNames.data(), numCacheableSlots); | |
if (o->structure()->isDictionary()) | |
return jsPropertyNameIterator; | |
if (o->structure()->typeInfo().overridesGetPropertyNames()) | |
return jsPropertyNameIterator; | |
size_t count = normalizePrototypeChain(exec, o); | |
StructureChain* structureChain = o->structure()->prototypeChain(exec); | |
RefPtr<Structure>* structure = structureChain->head(); | |
for (size_t i = 0; i < count; ++i) { | |
if (structure[i]->typeInfo().overridesGetPropertyNames()) | |
return jsPropertyNameIterator; | |
} | |
jsPropertyNameIterator->setCachedPrototypeChain(structureChain); | |
jsPropertyNameIterator->setCachedStructure(o->structure()); | |
o->structure()->setEnumerationCache(jsPropertyNameIterator); | |
return jsPropertyNameIterator; | |
} | |
JSValue JSPropertyNameIterator::get(ExecState* exec, JSObject* base, size_t i) | |
{ | |
JSValue& identifier = m_jsStrings[i]; | |
if (m_cachedStructure == base->structure() && m_cachedPrototypeChain == base->structure()->prototypeChain(exec)) | |
return identifier; | |
if (!base->hasProperty(exec, Identifier(exec, asString(identifier)->value(exec)))) | |
return JSValue(); | |
return identifier; | |
} | |
void JSPropertyNameIterator::markChildren(MarkStack& markStack) | |
{ | |
markStack.appendValues(m_jsStrings.get(), m_jsStringsSize, MayContainNullValues); | |
} | |
} // namespace JSC |