1 /*
2 * Copyright (C) 2010 Apple Inc. All Rights Reserved.
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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "StringStatics.h"
28
29 #include "AtomicString.h"
30 #include "StringImpl.h"
31 #include "wtf/DynamicAnnotations.h"
32 #include "wtf/MainThread.h"
33 #include "wtf/StaticConstructors.h"
34
35 namespace WTF {
36
empty()37 StringImpl* StringImpl::empty()
38 {
39 DEFINE_STATIC_LOCAL(StringImpl, emptyString, (ConstructEmptyString));
40 WTF_ANNOTATE_BENIGN_RACE(&emptyString,
41 "Benign race on the reference counter of a static string created by StringImpl::empty");
42 return &emptyString;
43 }
44
empty16Bit()45 StringImpl* StringImpl::empty16Bit()
46 {
47 DEFINE_STATIC_LOCAL(StringImpl, emptyString, (ConstructEmptyString16Bit));
48 WTF_ANNOTATE_BENIGN_RACE(&emptyString,
49 "Benign race on the reference counter of a static string created by StringImpl::empty16Bit");
50 return &emptyString;
51 }
52
DEFINE_GLOBAL(AtomicString,nullAtom)53 WTF_EXPORT DEFINE_GLOBAL(AtomicString, nullAtom)
54 WTF_EXPORT DEFINE_GLOBAL(AtomicString, emptyAtom)
55 WTF_EXPORT DEFINE_GLOBAL(AtomicString, starAtom)
56 WTF_EXPORT DEFINE_GLOBAL(AtomicString, xmlAtom)
57 WTF_EXPORT DEFINE_GLOBAL(AtomicString, xmlnsAtom)
58 WTF_EXPORT DEFINE_GLOBAL(AtomicString, xlinkAtom)
59
60 // This is not an AtomicString because it is unlikely to be used as an
61 // event/element/attribute name, so it shouldn't pollute the AtomicString hash
62 // table.
63 WTF_EXPORT DEFINE_GLOBAL(String, xmlnsWithColon)
64
65 NEVER_INLINE unsigned StringImpl::hashSlowCase() const
66 {
67 if (is8Bit())
68 setHash(StringHasher::computeHashAndMaskTop8Bits(characters8(), m_length));
69 else
70 setHash(StringHasher::computeHashAndMaskTop8Bits(characters16(), m_length));
71 return existingHash();
72 }
73
init()74 void AtomicString::init()
75 {
76 ASSERT(isMainThread());
77
78 new (NotNull, (void*)&nullAtom) AtomicString;
79 new (NotNull, (void*)&emptyAtom) AtomicString("");
80 }
81
init()82 void StringStatics::init()
83 {
84 ASSERT(isMainThread());
85
86 // FIXME: These should be allocated at compile time.
87 new (NotNull, (void*)&starAtom) AtomicString("*", AtomicString::ConstructFromLiteral);
88 new (NotNull, (void*)&xmlAtom) AtomicString("xml", AtomicString::ConstructFromLiteral);
89 new (NotNull, (void*)&xmlnsAtom) AtomicString("xmlns", AtomicString::ConstructFromLiteral);
90 new (NotNull, (void*)&xlinkAtom) AtomicString("xlink", AtomicString::ConstructFromLiteral);
91 new (NotNull, (void*)&xmlnsWithColon) String("xmlns:");
92 }
93
94 }
95