92 lines
4.1 KiB
C++
92 lines
4.1 KiB
C++
/*
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* Copyright (C) 2016 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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#include "config.h"
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#include <wtf/text/SymbolImpl.h>
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namespace WTF {
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// In addition to the normal hash value, store specialized hash value for
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// symbolized StringImpl*. And don't use the normal hash value for symbolized
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// StringImpl* when they are treated as Identifiers. Unique nature of these
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// symbolized StringImpl* keys means that we don't need them to match any other
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// string (in fact, that's exactly the oposite of what we want!), and the
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// normal hash would lead to lots of conflicts.
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unsigned SymbolImpl::nextHashForSymbol()
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{
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static unsigned s_nextHashForSymbol = 0;
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s_nextHashForSymbol += 1 << s_flagCount;
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s_nextHashForSymbol |= 1 << 31;
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return s_nextHashForSymbol;
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}
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Ref<SymbolImpl> SymbolImpl::create(StringImpl& rep)
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{
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auto* ownerRep = (rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep;
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ASSERT(ownerRep->bufferOwnership() != BufferSubstring);
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if (rep.is8Bit())
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return adoptRef(*new SymbolImpl(rep.m_data8, rep.length(), *ownerRep));
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return adoptRef(*new SymbolImpl(rep.m_data16, rep.length(), *ownerRep));
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}
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Ref<SymbolImpl> SymbolImpl::createNullSymbol()
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{
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return adoptRef(*new SymbolImpl);
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}
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Ref<PrivateSymbolImpl> PrivateSymbolImpl::create(StringImpl& rep)
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{
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auto* ownerRep = (rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep;
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ASSERT(ownerRep->bufferOwnership() != BufferSubstring);
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if (rep.is8Bit())
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return adoptRef(*new PrivateSymbolImpl(rep.m_data8, rep.length(), *ownerRep));
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return adoptRef(*new PrivateSymbolImpl(rep.m_data16, rep.length(), *ownerRep));
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}
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Ref<PrivateSymbolImpl> PrivateSymbolImpl::createNullSymbol()
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{
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return adoptRef(*new PrivateSymbolImpl);
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}
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Ref<RegisteredSymbolImpl> RegisteredSymbolImpl::create(StringImpl& rep, SymbolRegistry& symbolRegistry)
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{
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auto* ownerRep = (rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep;
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ASSERT(ownerRep->bufferOwnership() != BufferSubstring);
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if (rep.is8Bit())
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return adoptRef(*new RegisteredSymbolImpl(rep.m_data8, rep.length(), *ownerRep, symbolRegistry));
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return adoptRef(*new RegisteredSymbolImpl(rep.m_data16, rep.length(), *ownerRep, symbolRegistry));
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}
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Ref<RegisteredSymbolImpl> RegisteredSymbolImpl::createPrivate(StringImpl& rep, SymbolRegistry& symbolRegistry)
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{
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auto* ownerRep = (rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep;
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ASSERT(ownerRep->bufferOwnership() != BufferSubstring);
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if (rep.is8Bit())
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return adoptRef(*new RegisteredSymbolImpl(rep.m_data8, rep.length(), *ownerRep, symbolRegistry, s_flagIsRegistered | s_flagIsPrivate));
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return adoptRef(*new RegisteredSymbolImpl(rep.m_data16, rep.length(), *ownerRep, symbolRegistry, s_flagIsRegistered | s_flagIsPrivate));
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}
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} // namespace WTF
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