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30 #include "JSPropertyNameIterator.h"
32 #include "JSGlobalObject.h"
36 ASSERT_CLASS_FITS_IN_CELL(JSPropertyNameIterator);
38 const ClassInfo JSPropertyNameIterator::s_info = { "JSPropertyNameIterator", 0, 0, 0 };
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]))
48 JSPropertyNameIterator* JSPropertyNameIterator::create(ExecState* exec, JSObject* o)
50 ASSERT(!o->structure()->enumerationCache() ||
51 o->structure()->enumerationCache()->cachedStructure() != o->structure() ||
52 o->structure()->enumerationCache()->cachedPrototypeChain() != o->structure()->prototypeChain(exec));
54 PropertyNameArray propertyNames(exec);
55 o->getPropertyNames(exec, propertyNames);
56 size_t numCacheableSlots = 0;
57 if (!o->structure()->hasNonEnumerableProperties() && !o->structure()->hasGetterSetterProperties()
58 && !o->structure()->isUncacheableDictionary() && !o->structure()->typeInfo().overridesGetPropertyNames())
59 numCacheableSlots = o->structure()->propertyStorageSize();
61 JSPropertyNameIterator* jsPropertyNameIterator = new (allocateCell<JSPropertyNameIterator>(*exec->heap())) JSPropertyNameIterator(exec, propertyNames.data(), numCacheableSlots);
62 jsPropertyNameIterator->finishCreation(exec, propertyNames.data());
64 if (o->structure()->isDictionary())
65 return jsPropertyNameIterator;
67 if (o->structure()->typeInfo().overridesGetPropertyNames())
68 return jsPropertyNameIterator;
70 size_t count = normalizePrototypeChain(exec, o);
71 StructureChain* structureChain = o->structure()->prototypeChain(exec);
72 WriteBarrier<Structure>* structure = structureChain->head();
73 for (size_t i = 0; i < count; ++i) {
74 if (structure[i]->typeInfo().overridesGetPropertyNames())
75 return jsPropertyNameIterator;
78 jsPropertyNameIterator->setCachedPrototypeChain(exec->globalData(), structureChain);
79 jsPropertyNameIterator->setCachedStructure(exec->globalData(), o->structure());
80 o->structure()->setEnumerationCache(exec->globalData(), jsPropertyNameIterator);
81 return jsPropertyNameIterator;
84 JSValue JSPropertyNameIterator::get(ExecState* exec, JSObject* base, size_t i)
86 JSValue identifier = m_jsStrings[i].get();
87 if (m_cachedStructure.get() == base->structure() && m_cachedPrototypeChain.get() == base->structure()->prototypeChain(exec))
90 if (!base->hasProperty(exec, Identifier(exec, asString(identifier)->value(exec))))
95 void JSPropertyNameIterator::visitChildren(SlotVisitor& visitor)
97 ASSERT_GC_OBJECT_INHERITS(this, &s_info);
98 ASSERT(structure()->typeInfo().overridesVisitChildren());
99 visitor.appendValues(m_jsStrings.get(), m_jsStringsSize);
100 if (m_cachedPrototypeChain)
101 visitor.append(&m_cachedPrototypeChain);