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->methodTable()->getPropertyNames(o, exec, propertyNames, ExcludeDontEnumProperties); size_t numCacheableSlots = 0; if (!o->structure()->hasNonEnumerableProperties() && !o->structure()->hasGetterSetterProperties() && !o->structure()->isUncacheableDictionary() && !o->structure()->typeInfo().overridesGetPropertyNames()) numCacheableSlots = o->structure()->totalStorageSize(); JSPropertyNameIterator* jsPropertyNameIterator = new (NotNull, allocateCell<JSPropertyNameIterator>(*exec->heap())) JSPropertyNameIterator(exec, propertyNames.data(), numCacheableSlots); jsPropertyNameIterator->finishCreation(exec, propertyNames.data(), o); 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); WriteBarrier<Structure>* structure = structureChain->head(); for (size_t i = 0; i < count; ++i) { if (structure[i]->typeInfo().overridesGetPropertyNames()) return jsPropertyNameIterator; } jsPropertyNameIterator->setCachedPrototypeChain(exec->globalData(), structureChain); jsPropertyNameIterator->setCachedStructure(exec->globalData(), o->structure()); o->structure()->setEnumerationCache(exec->globalData(), jsPropertyNameIterator); return 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()->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; }