1/*
2 * Copyright (C) 2016 Yusuke Suzuki <utatane.tea@gmail.com>.
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. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include <wtf/text/SymbolImpl.h>
28
29namespace WTF {
30
31// In addition to the normal hash value, store specialized hash value for
32// symbolized StringImpl*. And don't use the normal hash value for symbolized
33// StringImpl* when they are treated as Identifiers. Unique nature of these
34// symbolized StringImpl* keys means that we don't need them to match any other
35// string (in fact, that's exactly the oposite of what we want!), and the
36// normal hash would lead to lots of conflicts.
37unsigned SymbolImpl::nextHashForSymbol()
38{
39 static unsigned s_nextHashForSymbol = 0;
40 s_nextHashForSymbol += 1 << s_flagCount;
41 s_nextHashForSymbol |= 1 << 31;
42 return s_nextHashForSymbol;
43}
44
45Ref<SymbolImpl> SymbolImpl::create(StringImpl& rep)
46{
47 auto* ownerRep = (rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep;
48 ASSERT(ownerRep->bufferOwnership() != BufferSubstring);
49 if (rep.is8Bit())
50 return adoptRef(*new SymbolImpl(rep.m_data8, rep.length(), *ownerRep));
51 return adoptRef(*new SymbolImpl(rep.m_data16, rep.length(), *ownerRep));
52}
53
54Ref<SymbolImpl> SymbolImpl::createNullSymbol()
55{
56 return adoptRef(*new SymbolImpl);
57}
58
59Ref<PrivateSymbolImpl> PrivateSymbolImpl::create(StringImpl& rep)
60{
61 auto* ownerRep = (rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep;
62 ASSERT(ownerRep->bufferOwnership() != BufferSubstring);
63 if (rep.is8Bit())
64 return adoptRef(*new PrivateSymbolImpl(rep.m_data8, rep.length(), *ownerRep));
65 return adoptRef(*new PrivateSymbolImpl(rep.m_data16, rep.length(), *ownerRep));
66}
67
68Ref<PrivateSymbolImpl> PrivateSymbolImpl::createNullSymbol()
69{
70 return adoptRef(*new PrivateSymbolImpl);
71}
72
73Ref<RegisteredSymbolImpl> RegisteredSymbolImpl::create(StringImpl& rep, SymbolRegistry& symbolRegistry)
74{
75 auto* ownerRep = (rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep;
76 ASSERT(ownerRep->bufferOwnership() != BufferSubstring);
77 if (rep.is8Bit())
78 return adoptRef(*new RegisteredSymbolImpl(rep.m_data8, rep.length(), *ownerRep, symbolRegistry));
79 return adoptRef(*new RegisteredSymbolImpl(rep.m_data16, rep.length(), *ownerRep, symbolRegistry));
80}
81
82} // namespace WTF
83