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	1	/*
	2	* Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	*
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. Neither the name of Apple Inc. ("Apple") nor the names of
	14	* its contributors may be used to endorse or promote products derived
	15	* from this software without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
	18	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	19	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	20	* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
	21	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	22	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	23	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	24	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	27	*/
	28
	29	#ifndef JSPropertyNameIterator_h
	30	#define JSPropertyNameIterator_h
	31
	32	#include "JSObject.h"
	33	#include "JSString.h"
	34	#include "PropertyNameArray.h"
	35	#include <memory>
	36
	37	namespace JSC {
	38
	39	class Identifier;
	40	class JSObject;
	41	class LLIntOffsetsExtractor;
	42
	43	class JSPropertyNameIterator : public JSCell {
	44	friend class JIT;
	45
	46	public:
	47	typedef JSCell Base;
	48
	49	static JSPropertyNameIterator* create(ExecState, JSObject);
	50
	51	static const bool needsDestruction = true;
	52	static const bool hasImmortalStructure = true;
	53	static void destroy(JSCell*);
	54
	55	static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
	56	{
	57	return Structure::create(vm, globalObject, prototype, TypeInfo(CompoundType, StructureFlags), info());
	58	}
	59
	60	static void visitChildren(JSCell*, SlotVisitor&);
	61
	62	JSValue get(ExecState, JSObject, size_t i);
	63	size_t size() { return m_jsStringsSize; }
	64
	65	void setCachedStructure(VM& vm, Structure* structure)
	66	{
	67	ASSERT(!m_cachedStructure);
	68	ASSERT(structure);
	69	m_cachedStructure.set(vm, this, structure);
	70	}
	71	Structure* cachedStructure() { return m_cachedStructure.get(); }
	72
	73	void setCachedPrototypeChain(VM& vm, StructureChain* cachedPrototypeChain) { m_cachedPrototypeChain.set(vm, this, cachedPrototypeChain); }
	74	StructureChain* cachedPrototypeChain() { return m_cachedPrototypeChain.get(); }
	75
	76	DECLARE_EXPORT_INFO;
	77
	78	protected:
	79	static const unsigned StructureFlags = OverridesVisitChildren \| StructureIsImmortal;
	80
	81	void finishCreation(VM& vm, PropertyNameArrayData* propertyNameArrayData, JSObject* object)
	82	{
	83	Base::finishCreation(vm);
	84	PropertyNameArrayData::PropertyNameVector& propertyNameVector = propertyNameArrayData->propertyNameVector();
	85	for (size_t i = 0; i < m_jsStringsSize; ++i)
	86	m_jsStrings[i].set(vm, this, jsOwnedString(&vm, propertyNameVector[i].string()));
	87	m_cachedStructureInlineCapacity = object->structure()->inlineCapacity();
	88	}
	89
	90	private:
	91	friend class LLIntOffsetsExtractor;
	92
	93	JSPropertyNameIterator(ExecState, PropertyNameArrayData propertyNameArrayData, size_t numCacheableSlot);
	94
	95	WriteBarrier<Structure> m_cachedStructure;
	96	WriteBarrier<StructureChain> m_cachedPrototypeChain;
	97	uint32_t m_numCacheableSlots;
	98	uint32_t m_jsStringsSize;
	99	unsigned m_cachedStructureInlineCapacity;
	100	std::unique_ptr<WriteBarrier<Unknown>[]> m_jsStrings;
	101	};
	102
	103	ALWAYS_INLINE JSPropertyNameIterator* Register::propertyNameIterator() const
	104	{
	105	return jsCast<JSPropertyNameIterator*>(jsValue().asCell());
	106	}
	107
	108	inline JSPropertyNameIterator* StructureRareData::enumerationCache()
	109	{
	110	return m_enumerationCache.get();
	111	}
	112
	113	inline void StructureRareData::setEnumerationCache(VM& vm, JSPropertyNameIterator* value)
	114	{
	115	m_enumerationCache.set(vm, this, value);
	116	}
	117
	118	} // namespace JSC
	119
	120	#endif // JSPropertyNameIterator_h