JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / wtf / text / StringImplBase.h

diff --git a/wtf/text/StringImplBase.h b/wtf/text/StringImplBase.h
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--- a/wtf/text/StringImplBase.h
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-/*
- * Copyright (C) 2010 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 StringImplBase_h
-#define StringImplBase_h
-
-#include <wtf/unicode/Unicode.h>
-
-namespace WTF {
-
-class StringImplBase {
-    WTF_MAKE_NONCOPYABLE(StringImplBase); WTF_MAKE_FAST_ALLOCATED;
-public:
-    bool isStringImpl() { return (m_refCountAndFlags & s_refCountInvalidForStringImpl) != s_refCountInvalidForStringImpl; }
-    unsigned length() const { return m_length; }
-    void ref() { m_refCountAndFlags += s_refCountIncrement; }
-
-protected:
-    enum BufferOwnership {
-        BufferInternal,
-        BufferOwned,
-        BufferSubstring,
-        BufferShared,
-    };
-
-    // For SmallStringStorage, which allocates an array and uses an in-place new.
-    StringImplBase() { }
-
-    StringImplBase(unsigned length, BufferOwnership ownership)
-        : m_refCountAndFlags(s_refCountIncrement | s_refCountFlagShouldReportedCost | ownership)
-        , m_length(length)
-    {
-        ASSERT(isStringImpl());
-    }
-
-    enum StaticStringConstructType { ConstructStaticString };
-    StringImplBase(unsigned length, StaticStringConstructType)
-        : m_refCountAndFlags(s_refCountFlagStatic | s_refCountFlagIsIdentifier | BufferOwned)
-        , m_length(length)
-    {
-        ASSERT(isStringImpl());
-    }
-
-    // This constructor is not used when creating StringImpl objects,
-    // and sets the flags into a state marking the object as such.
-    enum NonStringImplConstructType { ConstructNonStringImpl };
-    StringImplBase(NonStringImplConstructType)
-        : m_refCountAndFlags(s_refCountIncrement | s_refCountInvalidForStringImpl)
-        , m_length(0)
-    {
-        ASSERT(!isStringImpl());
-    }
-
-    // The bottom 7 bits hold flags, the top 25 bits hold the ref count.
-    // When dereferencing StringImpls we check for the ref count AND the
-    // static bit both being zero - static strings are never deleted.
-    static const unsigned s_refCountMask = 0xFFFFFF80;
-    static const unsigned s_refCountIncrement = 0x80;
-    static const unsigned s_refCountFlagStatic = 0x40;
-    static const unsigned s_refCountFlagHasTerminatingNullCharacter = 0x20;
-    static const unsigned s_refCountFlagIsAtomic = 0x10;
-    static const unsigned s_refCountFlagShouldReportedCost = 0x8;
-    static const unsigned s_refCountFlagIsIdentifier = 0x4;
-    static const unsigned s_refCountMaskBufferOwnership = 0x3;
-    // An invalid permutation of flags (static & shouldReportedCost - static strings do not
-    // set shouldReportedCost in the constructor, and this bit is only ever cleared, not set).
-    // Used by "ConstructNonStringImpl" constructor, above.
-    static const unsigned s_refCountInvalidForStringImpl = s_refCountFlagStatic | s_refCountFlagShouldReportedCost;
-
-    unsigned m_refCountAndFlags;
-    unsigned m_length;
-};
-
-} // namespace WTF
-
-using WTF::StringImplBase;
-
-#endif