Structure::Structure(JSValue prototype, const TypeInfo& typeInfo, unsigned anonymousSlotCount) : m_typeInfo(typeInfo) , m_prototype(prototype) , m_specificValueInPrevious(0) , m_propertyTable(0) , m_propertyStorageCapacity(typeInfo.isFinal() ? JSFinalObject_inlineStorageCapacity : JSNonFinalObject_inlineStorageCapacity) , m_offset(noOffset) , m_dictionaryKind(NoneDictionaryKind) , m_isPinnedPropertyTable(false) , m_hasGetterSetterProperties(false) , m_hasNonEnumerableProperties(false) , m_attributesInPrevious(0) , m_specificFunctionThrashCount(0) , m_anonymousSlotCount(anonymousSlotCount) , m_isUsingSingleSlot(true) { m_transitions.m_singleTransition = 0; ASSERT(m_prototype); ASSERT(m_prototype->isObject() || m_prototype->isNull()); #ifndef NDEBUG #if ENABLE(JSC_MULTIPLE_THREADS) MutexLocker protect(ignoreSetMutex); #endif if (shouldIgnoreLeaks) ignoreSet.add(this); else structureCounter.increment(); #endif #if DUMP_STRUCTURE_ID_STATISTICS liveStructureSet.add(this); #endif }