git.saurik.com Git - apple/javascriptcore.git/blame_incremental

... / ...

Commit	Line	Data
	1	/*
	2	* Copyright (C) 2008 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	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	14	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	15	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	16	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	17	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	18	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	19	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	20	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	21	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	23	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#ifndef StructureChain_h
	27	#define StructureChain_h
	28
	29	#include "JSCell.h"
	30	#include "JSObject.h"
	31	#include "Structure.h"
	32
	33	#include <wtf/PassRefPtr.h>
	34	#include <wtf/RefCounted.h>
	35	#include <wtf/RefPtr.h>
	36	#include <wtf/StdLibExtras.h>
	37
	38	namespace JSC {
	39
	40	class LLIntOffsetsExtractor;
	41	class Structure;
	42
	43	class StructureChain final : public JSCell {
	44	friend class JIT;
	45
	46	public:
	47	typedef JSCell Base;
	48	static const unsigned StructureFlags = Base::StructureFlags \| StructureIsImmortal;
	49
	50	static StructureChain* create(VM& vm, Structure* head)
	51	{
	52	StructureChain* chain = new (NotNull, allocateCell<StructureChain>(vm.heap)) StructureChain(vm, vm.structureChainStructure.get());
	53	chain->finishCreation(vm, head);
	54	return chain;
	55	}
	56	WriteBarrier<Structure>* head() { return m_vector.get(); }
	57	static void visitChildren(JSCell*, SlotVisitor&);
	58
	59	static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
	60	{
	61	return Structure::create(vm, globalObject, prototype, TypeInfo(CellType, StructureFlags), info());
	62	}
	63
	64	DECLARE_INFO;
	65
	66	static const bool needsDestruction = true;
	67	static void destroy(JSCell*);
	68
	69	protected:
	70	void finishCreation(VM& vm, Structure* head)
	71	{
	72	Base::finishCreation(vm);
	73	size_t size = 0;
	74	for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
	75	++size;
	76
	77	m_vector = std::make_unique<WriteBarrier<Structure>[]>(size + 1);
	78
	79	size_t i = 0;
	80	for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
	81	m_vector[i++].set(vm, this, current);
	82	}
	83
	84	private:
	85	friend class LLIntOffsetsExtractor;
	86
	87	StructureChain(VM&, Structure*);
	88	std::unique_ptr<WriteBarrier<Structure>[]> m_vector;
	89	};
	90
	91	} // namespace JSC
	92
	93	#endif // StructureChain_h