| /* |
| * 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 "DynamicAnnotations.h" |
| #include "StaticConstructors.h" |
| #include "StringImpl.h" |
| |
| namespace WTF { |
| |
| 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)); |
| WTF_ANNOTATE_BENIGN_RACE(&emptyString, "Benign race on StringImpl::emptyString reference counter"); |
| 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") |
| |
| 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*)&nullAtom) AtomicString; |
| new ((void*)&emptyAtom) AtomicString(""); |
| new ((void*)&textAtom) AtomicString("#text"); |
| new ((void*)&commentAtom) AtomicString("#comment"); |
| new ((void*)&starAtom) AtomicString("*"); |
| new ((void*)&xmlAtom) AtomicString("xml"); |
| new ((void*)&xmlnsAtom) AtomicString("xmlns"); |
| |
| initialized = true; |
| } |
| } |
| |
| } |