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
35namespace WTF {
36
37StringImpl* 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
45StringImpl* 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
53WTF_EXPORT DEFINE_GLOBAL(AtomicString, nullAtom)
54WTF_EXPORT DEFINE_GLOBAL(AtomicString, emptyAtom)
55WTF_EXPORT DEFINE_GLOBAL(AtomicString, starAtom)
56WTF_EXPORT DEFINE_GLOBAL(AtomicString, xmlAtom)
57WTF_EXPORT DEFINE_GLOBAL(AtomicString, xmlnsAtom)
58WTF_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.
63WTF_EXPORT DEFINE_GLOBAL(String, xmlnsWithColon)
64
65NEVER_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
74void AtomicString::init()
75{
76    ASSERT(isMainThread());
77
78    new (NotNull, (void*)&nullAtom) AtomicString;
79    new (NotNull, (void*)&emptyAtom) AtomicString("");
80}
81
82void 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