63 lines
2.6 KiB
C++
63 lines
2.6 KiB
C++
/*
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* Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/text/StringImpl.h>
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namespace WTF {
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// It represents that the string impl is uniqued in some ways.
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// When the given 2 string impls are both uniqued string impls, we can compare it just using pointer comparison.
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class UniquedStringImpl : public StringImpl {
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private:
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UniquedStringImpl() = delete;
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protected:
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UniquedStringImpl(CreateSymbolTag, const LChar* characters, unsigned length) : StringImpl(CreateSymbol, characters, length) { }
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UniquedStringImpl(CreateSymbolTag, const UChar* characters, unsigned length) : StringImpl(CreateSymbol, characters, length) { }
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UniquedStringImpl(CreateSymbolTag) : StringImpl(CreateSymbol) { }
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};
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#if ASSERT_ENABLED
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// UniquedStringImpls created from StaticStringImpl will ASSERT
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// in the generic ValueCheck<T>::checkConsistency
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// as they are not allocated by fastMalloc.
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// We don't currently have any way to detect that case
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// so we ignore the consistency check for all UniquedStringImpls*.
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template<> struct
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ValueCheck<UniquedStringImpl*> {
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static void checkConsistency(const UniquedStringImpl*) { }
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};
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template<> struct
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ValueCheck<const UniquedStringImpl*> {
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static void checkConsistency(const UniquedStringImpl*) { }
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};
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#endif // ASSERT_ENABLED
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} // namespace WTF
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using WTF::UniquedStringImpl;
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