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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 #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