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      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 
     39 namespace WTF {
     40 
     41 StringImpl* 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 
     48 WTF_EXPORT DEFINE_GLOBAL(AtomicString, nullAtom)
     49 WTF_EXPORT DEFINE_GLOBAL(AtomicString, emptyAtom)
     50 WTF_EXPORT DEFINE_GLOBAL(AtomicString, starAtom)
     51 WTF_EXPORT DEFINE_GLOBAL(AtomicString, xmlAtom)
     52 WTF_EXPORT DEFINE_GLOBAL(AtomicString, xmlnsAtom)
     53 WTF_EXPORT DEFINE_GLOBAL(AtomicString, xlinkAtom)
     54 
     55 NEVER_INLINE unsigned StringImpl::hashSlowCase() const
     56 {
     57     if (is8Bit())
     58         setHash(StringHasher::computeHashAndMaskTop8Bits(characters8(), m_length));
     59     else
     60         setHash(StringHasher::computeHashAndMaskTop8Bits(characters16(), m_length));
     61     return existingHash();
     62 }
     63 
     64 void AtomicString::init()
     65 {
     66     ASSERT(isMainThread());
     67 
     68     new (NotNull, (void*)&nullAtom) AtomicString;
     69     new (NotNull, (void*)&emptyAtom) AtomicString("");
     70 }
     71 
     72 void StringStatics::init()
     73 {
     74     ASSERT(isMainThread());
     75 
     76     // FIXME: These should be allocated at compile time.
     77     new (NotNull, (void*)&starAtom) AtomicString("*", AtomicString::ConstructFromLiteral);
     78     new (NotNull, (void*)&xmlAtom) AtomicString("xml", AtomicString::ConstructFromLiteral);
     79     new (NotNull, (void*)&xmlnsAtom) AtomicString("xmlns", AtomicString::ConstructFromLiteral);
     80     new (NotNull, (void*)&xlinkAtom) AtomicString("xlink", AtomicString::ConstructFromLiteral);
     81 }
     82 
     83 }
     84