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#ifdef SKIP_STATIC_CONSTRUCTORS_ON_GCC
30#define ATOMICSTRING_HIDE_GLOBALS 1
31#endif
32
33#include "AtomicString.h"
34#include "StringImpl.h"
35#include "wtf/DynamicAnnotations.h"
36#include "wtf/MainThread.h"
37#include "wtf/StaticConstructors.h"
38
39namespace WTF {
40
41StringImpl* StringImpl::empty()
42{
43    DEFINE_STATIC_LOCAL(StringImpl, emptyString, (ConstructEmptyString));
44    WTF_ANNOTATE_BENIGN_RACE(&emptyString, "Benign race on StringImpl::emptyString reference counter");
45    return &emptyString;
46}
47
48WTF_EXPORT DEFINE_GLOBAL(AtomicString, nullAtom)
49WTF_EXPORT DEFINE_GLOBAL(AtomicString, emptyAtom)
50WTF_EXPORT DEFINE_GLOBAL(AtomicString, textAtom)
51WTF_EXPORT DEFINE_GLOBAL(AtomicString, commentAtom)
52WTF_EXPORT DEFINE_GLOBAL(AtomicString, starAtom)
53WTF_EXPORT DEFINE_GLOBAL(AtomicString, xmlAtom)
54WTF_EXPORT DEFINE_GLOBAL(AtomicString, xmlnsAtom)
55WTF_EXPORT DEFINE_GLOBAL(AtomicString, xlinkAtom)
56
57NEVER_INLINE unsigned StringImpl::hashSlowCase() const
58{
59    if (is8Bit())
60        setHash(StringHasher::computeHashAndMaskTop8Bits(characters8(), m_length));
61    else
62        setHash(StringHasher::computeHashAndMaskTop8Bits(characters16(), m_length));
63    return existingHash();
64}
65
66void AtomicString::init()
67{
68    ASSERT(isMainThread());
69
70    new (NotNull, (void*)&nullAtom) AtomicString;
71    new (NotNull, (void*)&emptyAtom) AtomicString("");
72}
73
74void StringStatics::init()
75{
76    ASSERT(isMainThread());
77
78    // FIXME: These should be allocated at compile time.
79    new (NotNull, (void*)&textAtom) AtomicString("#text", AtomicString::ConstructFromLiteral);
80    new (NotNull, (void*)&commentAtom) AtomicString("#comment", AtomicString::ConstructFromLiteral);
81    new (NotNull, (void*)&starAtom) AtomicString("*", AtomicString::ConstructFromLiteral);
82    new (NotNull, (void*)&xmlAtom) AtomicString("xml", AtomicString::ConstructFromLiteral);
83    new (NotNull, (void*)&xmlnsAtom) AtomicString("xmlns", AtomicString::ConstructFromLiteral);
84    new (NotNull, (void*)&xlinkAtom) AtomicString("xlink", AtomicString::ConstructFromLiteral);
85}
86
87}
88