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 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 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 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 74 void AtomicString::init() 75 { 76 ASSERT(isMainThread()); 77 78 new (NotNull, (void*)&nullAtom) AtomicString; 79 new (NotNull, (void*)&emptyAtom) AtomicString(""); 80 } 81 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