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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	* 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 SmallStrings_h
	27	#define SmallStrings_h
	28
	29	#include "WriteBarrier.h"
	30
	31	#include <wtf/FixedArray.h>
	32	#include <wtf/Noncopyable.h>
	33	#include <wtf/OwnPtr.h>
	34
	35	#define JSC_COMMON_STRINGS_EACH_NAME(macro) \
	36	macro(boolean) \
	37	macro(false) \
	38	macro(function) \
	39	macro(number) \
	40	macro(null) \
	41	macro(object) \
	42	macro(undefined) \
	43	macro(string) \
	44	macro(true)
	45
	46	namespace WTF {
	47	class StringImpl;
	48	}
	49
	50	namespace JSC {
	51
	52	class HeapRootVisitor;
	53	class VM;
	54	class JSString;
	55	class SmallStringsStorage;
	56	class SlotVisitor;
	57
	58	static const unsigned maxSingleCharacterString = 0xFF;
	59
	60	class SmallStrings {
	61	WTF_MAKE_NONCOPYABLE(SmallStrings);
	62	public:
	63	SmallStrings();
	64	~SmallStrings();
	65
	66	JSString* emptyString()
	67	{
	68	return m_emptyString;
	69	}
	70
	71	JSString* singleCharacterString(VM* vm, unsigned char character)
	72	{
	73	if (!m_singleCharacterStrings[character])
	74	createSingleCharacterString(vm, character);
	75	return m_singleCharacterStrings[character];
	76	}
	77
	78	JS_EXPORT_PRIVATE WTF::StringImpl* singleCharacterStringRep(unsigned char character);
	79
	80	void finalizeSmallStrings();
	81
	82	JSString** singleCharacterStrings() { return &m_singleCharacterStrings[0]; }
	83
	84	void initializeCommonStrings(VM&);
	85	void visitStrongReferences(SlotVisitor&);
	86
	87	#define JSC_COMMON_STRINGS_ACCESSOR_DEFINITION(name) \
	88	JSString* name##String() const \
	89	{ \
	90	return m_##name; \
	91	}
	92	JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ACCESSOR_DEFINITION)
	93	#undef JSC_COMMON_STRINGS_ACCESSOR_DEFINITION
	94
	95	private:
	96	static const unsigned singleCharacterStringCount = maxSingleCharacterString + 1;
	97
	98	JS_EXPORT_PRIVATE void createEmptyString(VM*);
	99	JS_EXPORT_PRIVATE void createSingleCharacterString(VM*, unsigned char);
	100
	101	void initialize(VM* vm, JSString& string, const char value) const;
	102
	103	JSString* m_emptyString;
	104	#define JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION(name) JSString* m_##name;
	105	JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION)
	106	#undef JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION
	107	JSString* m_singleCharacterStrings[singleCharacterStringCount];
	108	OwnPtr<SmallStringsStorage> m_storage;
	109	};
	110
	111	} // namespace JSC
	112
	113	#endif // SmallStrings_h