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 #define STRING_HIDE_GLOBALS 1 32 #endif 33 34 #include "AtomicString.h" 35 #include "StringImpl.h" 36 #include "wtf/DynamicAnnotations.h" 37 #include "wtf/MainThread.h" 38 #include "wtf/StaticConstructors.h" 39 40 namespace WTF { 41 42 StringImpl* StringImpl::empty() 43 { 44 DEFINE_STATIC_LOCAL(StringImpl, emptyString, (ConstructEmptyString)); 45 WTF_ANNOTATE_BENIGN_RACE(&emptyString, "Benign race on StringImpl::emptyString reference counter"); 46 return &emptyString; 47 } 48 49 WTF_EXPORT DEFINE_GLOBAL(AtomicString, nullAtom) 50 WTF_EXPORT DEFINE_GLOBAL(AtomicString, emptyAtom) 51 WTF_EXPORT DEFINE_GLOBAL(AtomicString, starAtom) 52 WTF_EXPORT DEFINE_GLOBAL(AtomicString, xmlAtom) 53 WTF_EXPORT DEFINE_GLOBAL(AtomicString, xmlnsAtom) 54 WTF_EXPORT DEFINE_GLOBAL(AtomicString, xlinkAtom) 55 56 // This is not an AtomicString because it is unlikely to be used as an 57 // event/element/attribute name, so it shouldn't pollute the AtomicString hash 58 // table. 59 WTF_EXPORT DEFINE_GLOBAL(String, xmlnsWithColon) 60 61 NEVER_INLINE unsigned StringImpl::hashSlowCase() const 62 { 63 if (is8Bit()) 64 setHash(StringHasher::computeHashAndMaskTop8Bits(characters8(), m_length)); 65 else 66 setHash(StringHasher::computeHashAndMaskTop8Bits(characters16(), m_length)); 67 return existingHash(); 68 } 69 70 void AtomicString::init() 71 { 72 ASSERT(isMainThread()); 73 74 new (NotNull, (void*)&nullAtom) AtomicString; 75 new (NotNull, (void*)&emptyAtom) AtomicString(""); 76 } 77 78 void StringStatics::init() 79 { 80 ASSERT(isMainThread()); 81 82 // FIXME: These should be allocated at compile time. 83 new (NotNull, (void*)&starAtom) AtomicString("*", AtomicString::ConstructFromLiteral); 84 new (NotNull, (void*)&xmlAtom) AtomicString("xml", AtomicString::ConstructFromLiteral); 85 new (NotNull, (void*)&xmlnsAtom) AtomicString("xmlns", AtomicString::ConstructFromLiteral); 86 new (NotNull, (void*)&xlinkAtom) AtomicString("xlink", AtomicString::ConstructFromLiteral); 87 new (NotNull, (void*)&xmlnsWithColon) String("xmlns:"); 88 } 89 90 } 91