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 "UString.h"

    30 #include <wtf/FixedArray.h>

    31 #include <wtf/OwnPtr.h>

    32 

    33 namespace JSC {

    34 

    35     class JSGlobalData;

    36     class JSString;

    37     class MarkStack;

    38     class SmallStringsStorage;

    39 

    40     class SmallStrings : public Noncopyable {

    41     public:

    42         SmallStrings();

    43         ~SmallStrings();

    44 

    45         JSString* emptyString(JSGlobalData* globalData)

    46         {

    47             if (!m_emptyString)

    48                 createEmptyString(globalData);

    49             return m_emptyString;

    50         }

    51         JSString* singleCharacterString(JSGlobalData* globalData, unsigned char character)

    52         {

    53             if (!m_singleCharacterStrings[character])

    54                 createSingleCharacterString(globalData, character);

    55             return m_singleCharacterStrings[character];

    56         }

    57 

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

    59 

    60         void markChildren(MarkStack&);

    61         void clear();

    62 

    63         unsigned count() const;

    64 #if ENABLE(JIT)

    65         JSString** singleCharacterStrings() { return m_singleCharacterStrings.data(); }

    66 #endif

    67     private:

    68         void createEmptyString(JSGlobalData*);

    69         void createSingleCharacterString(JSGlobalData*, unsigned char);

    70 

    71         JSString* m_emptyString;

    72         FixedArray<JSString*, 0x100> m_singleCharacterStrings;

    73         OwnPtr<SmallStringsStorage> m_storage;

    74     };

    75 

    76 } // namespace JSC

    77 

    78 #endif // SmallStrings_h