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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 Computer, 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 "Operations.h"
	35	#include "PropertyNameArray.h"
	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	static JSPropertyNameIterator* create(ExecState* exec, PropertyNameArrayData* propertyNameArrayData, size_t numCacheableSlot)
	51	{
	52	JSPropertyNameIterator* iterator = new (NotNull, allocateCell<JSPropertyNameIterator>(*exec->heap())) JSPropertyNameIterator(exec, propertyNameArrayData, numCacheableSlot);
	53	iterator->finishCreation(exec, propertyNameArrayData);
	54	return iterator;
	55	}
	56
	57	static void destroy(JSCell*);
	58
	59	static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype)
	60	{
	61	return Structure::create(globalData, globalObject, prototype, TypeInfo(CompoundType, OverridesVisitChildren), &s_info);
	62	}
	63
	64	static void visitChildren(JSCell*, SlotVisitor&);
	65
	66	bool getOffset(size_t i, int& offset)
	67	{
	68	if (i >= m_numCacheableSlots)
	69	return false;
	70	offset = i;
	71	return true;
	72	}
	73
	74	JSValue get(ExecState, JSObject, size_t i);
	75	size_t size() { return m_jsStringsSize; }
	76
	77	void setCachedStructure(JSGlobalData& globalData, Structure* structure)
	78	{
	79	ASSERT(!m_cachedStructure);
	80	ASSERT(structure);
	81	m_cachedStructure.set(globalData, this, structure);
	82	}
	83	Structure* cachedStructure() { return m_cachedStructure.get(); }
	84
	85	void setCachedPrototypeChain(JSGlobalData& globalData, StructureChain* cachedPrototypeChain) { m_cachedPrototypeChain.set(globalData, this, cachedPrototypeChain); }
	86	StructureChain* cachedPrototypeChain() { return m_cachedPrototypeChain.get(); }
	87
	88	static const ClassInfo s_info;
	89
	90	protected:
	91	void finishCreation(ExecState* exec, PropertyNameArrayData* propertyNameArrayData)
	92	{
	93	Base::finishCreation(exec->globalData());
	94	PropertyNameArrayData::PropertyNameVector& propertyNameVector = propertyNameArrayData->propertyNameVector();
	95	for (size_t i = 0; i < m_jsStringsSize; ++i)
	96	m_jsStrings[i].set(exec->globalData(), this, jsOwnedString(exec, propertyNameVector[i].ustring()));
	97	}
	98
	99	private:
	100	friend class LLIntOffsetsExtractor;
	101
	102	JSPropertyNameIterator(ExecState, PropertyNameArrayData propertyNameArrayData, size_t numCacheableSlot);
	103
	104	WriteBarrier<Structure> m_cachedStructure;
	105	WriteBarrier<StructureChain> m_cachedPrototypeChain;
	106	uint32_t m_numCacheableSlots;
	107	uint32_t m_jsStringsSize;
	108	OwnArrayPtr<WriteBarrier<Unknown> > m_jsStrings;
	109	};
	110
	111	inline void Structure::setEnumerationCache(JSGlobalData& globalData, JSPropertyNameIterator* enumerationCache)
	112	{
	113	ASSERT(!isDictionary());
	114	m_enumerationCache.set(globalData, this, enumerationCache);
	115	}
	116
	117	inline JSPropertyNameIterator* Structure::enumerationCache()
	118	{
	119	return m_enumerationCache.get();
	120	}
	121
	122	ALWAYS_INLINE JSPropertyNameIterator* Register::propertyNameIterator() const
	123	{
	124	return jsCast<JSPropertyNameIterator*>(jsValue().asCell());
	125	}
	126
	127	} // namespace JSC
	128
	129	#endif // JSPropertyNameIterator_h