sky/engine/wtf/text/StringStatics.cpp

/*
 * Copyright (C) 2010 Apple Inc. All Rights Reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
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#include "sky/engine/wtf/text/StringStatics.h"

#include "sky/engine/wtf/DynamicAnnotations.h"
#include "sky/engine/wtf/MainThread.h"
#include "sky/engine/wtf/StaticConstructors.h"
#include "sky/engine/wtf/text/AtomicString.h"
#include "sky/engine/wtf/text/StringImpl.h"

namespace WTF {

StringImpl* StringImpl::empty()
{
    DEFINE_STATIC_LOCAL(StringImpl, emptyString, (ConstructEmptyString));
    WTF_ANNOTATE_BENIGN_RACE(&emptyString, "Benign race on StringImpl::emptyString reference counter");
    return &emptyString;
}

WTF_EXPORT DEFINE_GLOBAL(AtomicString, nullAtom)
WTF_EXPORT DEFINE_GLOBAL(AtomicString, emptyAtom)
WTF_EXPORT DEFINE_GLOBAL(AtomicString, starAtom)

NEVER_INLINE unsigned StringImpl::hashSlowCase() const
{
    if (is8Bit())
        setHash(StringHasher::computeHashAndMaskTop8Bits(characters8(), m_length));
    else
        setHash(StringHasher::computeHashAndMaskTop8Bits(characters16(), m_length));
    return existingHash();
}

void AtomicString::init()
{
    ASSERT(isMainThread());

    new (NotNull, (void*)&nullAtom) AtomicString;
    new (NotNull, (void*)&emptyAtom) AtomicString("");
}

void StringStatics::init()
{
    ASSERT(isMainThread());

    // FIXME: These should be allocated at compile time.
    new (NotNull, (void*)&starAtom) AtomicString("*", AtomicString::ConstructFromLiteral);
}

}