| /* |
| * 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); |
| |
| inline JSPropertyNameIterator::JSPropertyNameIterator(ExecState* exec, PropertyNameArrayData* propertyNameArrayData, size_t numCacheableSlots) |
| : JSCell(exec->globalData().propertyNameIteratorStructure.get()) |
| , m_cachedStructure(0) |
| , m_numCacheableSlots(numCacheableSlots) |
| , m_jsStringsSize(propertyNameArrayData->propertyNameVector().size()) |
| , m_jsStrings(new JSValue[m_jsStringsSize]) |
| { |
| PropertyNameArrayData::PropertyNameVector& propertyNameVector = propertyNameArrayData->propertyNameVector(); |
| for (size_t i = 0; i < m_jsStringsSize; ++i) |
| m_jsStrings[i] = jsOwnedString(exec, propertyNameVector[i].ustring()); |
| } |
| |
| JSPropertyNameIterator::~JSPropertyNameIterator() |
| { |
| if (m_cachedStructure) |
| m_cachedStructure->clearEnumerationCache(this); |
| } |
| |
| 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 |