[apple/javascriptcore.git] / runtime / SmallStrings.h

/*
 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef SmallStrings_h
#define SmallStrings_h

#include "UString.h"
#include <wtf/OwnPtr.h>

namespace JSC {

    class JSGlobalData;
    class JSString;

    class SmallStringsStorage;

    class SmallStrings : Noncopyable {
    public:
        SmallStrings();
        ~SmallStrings();

        JSString* emptyString(JSGlobalData* globalData)
        {
            if (!m_emptyString)
                createEmptyString(globalData);
            return m_emptyString;
        }
        JSString* singleCharacterString(JSGlobalData* globalData, unsigned char character)
        {
            if (!m_singleCharacterStrings[character])
                createSingleCharacterString(globalData, character);
            return m_singleCharacterStrings[character];
        }

        UString::Rep* singleCharacterStringRep(unsigned char character);

        void mark();

        unsigned count() const;

    private:
        void createEmptyString(JSGlobalData*);
        void createSingleCharacterString(JSGlobalData*, unsigned char);

        JSString* m_emptyString;
        JSString* m_singleCharacterStrings[0x100];
        OwnPtr<SmallStringsStorage> m_storage;
    };

} // namespace JSC

#endif // SmallStrings_h
Commit	Line	Data
9dae56ea A	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 SmallStrings_h
	27	#define SmallStrings_h
	28
	29	#include "UString.h"
	30	#include <wtf/OwnPtr.h>
	31
	32	namespace JSC {
	33
	34	class JSGlobalData;
	35	class JSString;
	36
	37	class SmallStringsStorage;
	38
	39	class SmallStrings : Noncopyable {
	40	public:
	41	SmallStrings();
	42	~SmallStrings();
	43
	44	JSString* emptyString(JSGlobalData* globalData)
	45	{
	46	if (!m_emptyString)
	47	createEmptyString(globalData);
	48	return m_emptyString;
	49	}
	50	JSString* singleCharacterString(JSGlobalData* globalData, unsigned char character)
	51	{
	52	if (!m_singleCharacterStrings[character])
	53	createSingleCharacterString(globalData, character);
	54	return m_singleCharacterStrings[character];
	55	}
	56
	57	UString::Rep* singleCharacterStringRep(unsigned char character);
	58
	59	void mark();
	60
	61	unsigned count() const;
	62
	63	private:
	64	void createEmptyString(JSGlobalData*);
65	void createSingleCharacterString(JSGlobalData*, unsigned char);
66
67	JSString* m_emptyString;
68	JSString* m_singleCharacterStrings[0x100];
69	OwnPtr<SmallStringsStorage> m_storage;
70	};
71
72	} // namespace JSC
73
74	#endif // SmallStrings_h