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/*
* Copyright (C) 2016 Yusuke Suzuki <utatane.tea@gmail.com>.
*
* 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. AND ITS CONTRIBUTORS ``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 ITS 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.
*/
#include "config.h"
#include <wtf/text/SymbolImpl.h>
namespace WTF {
// In addition to the normal hash value, store specialized hash value for
// symbolized StringImpl*. And don't use the normal hash value for symbolized
// StringImpl* when they are treated as Identifiers. Unique nature of these
// symbolized StringImpl* keys means that we don't need them to match any other
// string (in fact, that's exactly the oposite of what we want!), and the
// normal hash would lead to lots of conflicts.
unsigned SymbolImpl::nextHashForSymbol()
{
static unsigned s_nextHashForSymbol = 0;
s_nextHashForSymbol += 1 << s_flagCount;
s_nextHashForSymbol |= 1u << 31;
return s_nextHashForSymbol;
}
Ref<SymbolImpl> SymbolImpl::create(StringImpl& rep)
{
auto* ownerRep = (rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep;
ASSERT(ownerRep->bufferOwnership() != BufferSubstring);
if (rep.is8Bit())
return adoptRef(*new SymbolImpl(rep.span8(), *ownerRep));
return adoptRef(*new SymbolImpl(rep.span16(), *ownerRep));
}
Ref<SymbolImpl> SymbolImpl::createNullSymbol()
{
return adoptRef(*new SymbolImpl);
}
Ref<PrivateSymbolImpl> PrivateSymbolImpl::create(StringImpl& rep)
{
auto* ownerRep = (rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep;
ASSERT(ownerRep->bufferOwnership() != BufferSubstring);
if (rep.is8Bit())
return adoptRef(*new PrivateSymbolImpl(rep.span8(), *ownerRep));
return adoptRef(*new PrivateSymbolImpl(rep.span16(), *ownerRep));
}
Ref<RegisteredSymbolImpl> RegisteredSymbolImpl::create(StringImpl& rep, SymbolRegistry& symbolRegistry)
{
auto* ownerRep = (rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep;
ASSERT(ownerRep->bufferOwnership() != BufferSubstring);
if (rep.is8Bit())
return adoptRef(*new RegisteredSymbolImpl(rep.span8(), *ownerRep, symbolRegistry));
return adoptRef(*new RegisteredSymbolImpl(rep.span16(), *ownerRep, symbolRegistry));
}
Ref<RegisteredSymbolImpl> RegisteredSymbolImpl::createPrivate(StringImpl& rep, SymbolRegistry& symbolRegistry)
{
auto* ownerRep = (rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep;
ASSERT(ownerRep->bufferOwnership() != BufferSubstring);
if (rep.is8Bit())
return adoptRef(*new RegisteredSymbolImpl(rep.span8(), *ownerRep, symbolRegistry, s_flagIsRegistered | s_flagIsPrivate));
return adoptRef(*new RegisteredSymbolImpl(rep.span16(), *ownerRep, symbolRegistry, s_flagIsRegistered | s_flagIsPrivate));
}
} // namespace WTF
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