/*

 * Copyright (C) 2010 Apple Inc. All Rights Reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "config.h"

#ifdef SKIP_STATIC_CONSTRUCTORS_ON_GCC

#define ATOMICSTRING_HIDE_GLOBALS 1

#endif

#include "AtomicString.h"

#include "StaticConstructors.h"

#include "StringImpl.h"

namespace WebCore {

StringImpl* StringImpl::empty()

{

    // FIXME: This works around a bug in our port of PCRE, that a regular expression

    // run on the empty string may still perform a read from the first element, and

    // as such we need this to be a valid pointer. No code should ever be reading

    // from a zero length string, so this should be able to be a non-null pointer

    // into the zero-page.

    // Replace this with 'reinterpret_cast<UChar*>(static_cast<intptr_t>(1))' once

    // PCRE goes away.

    static UChar emptyUCharData = 0;

    DEFINE_STATIC_LOCAL(StringImpl, emptyString, (&emptyUCharData, 0, ConstructStaticString));

    return &emptyString;

}

/*

JS_EXPORTDATA DEFINE_GLOBAL(AtomicString, nullAtom)

JS_EXPORTDATA DEFINE_GLOBAL(AtomicString, emptyAtom, "")

JS_EXPORTDATA DEFINE_GLOBAL(AtomicString, textAtom, "#text")

JS_EXPORTDATA DEFINE_GLOBAL(AtomicString, commentAtom, "#comment")

JS_EXPORTDATA DEFINE_GLOBAL(AtomicString, starAtom, "*")

JS_EXPORTDATA DEFINE_GLOBAL(AtomicString, xmlAtom, "xml")

JS_EXPORTDATA DEFINE_GLOBAL(AtomicString, xmlnsAtom, "xmlns")

*/

AtomicString nullAtom1;

AtomicString emptyAtom1;

AtomicString textAtom1;

AtomicString commentAtom1;

AtomicString starAtom1;

AtomicString xmlAtom1;

AtomicString xmlnsAtom1;

void AtomicString::init()

{

    static bool initialized;

    if (!initialized) {

        // Initialization is not thread safe, so this function must be called from the main thread first.

        ASSERT(isMainThread());

        // Use placement new to initialize the globals.

        new ((void*)&nullAtom1) AtomicString;

        new ((void*)&emptyAtom1) AtomicString("");

        new ((void*)&textAtom1) AtomicString("#text");

        new ((void*)&commentAtom1) AtomicString("#comment");

        new ((void*)&starAtom1) AtomicString("*");

        new ((void*)&xmlAtom1) AtomicString("xml");

        new ((void*)&xmlnsAtom1) AtomicString("xmlns");

        initialized = true;

    }

}

const AtomicString& AtomicString::nullAtom2() { return nullAtom1;}

const AtomicString& AtomicString::emptyAtom2() { return emptyAtom1;}

const AtomicString& AtomicString::textAtom2() { return textAtom1;}

const AtomicString& AtomicString::commentAtom2() { return commentAtom1;}

const AtomicString& AtomicString::starAtom2() { return starAtom1;}

const AtomicString& AtomicString::xmlAtom2() { return xmlAtom1;}

const AtomicString& AtomicString::xmlnsAtom2() { return xmlnsAtom1;}

}