mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-05 16:31:37 +00:00
116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
/*
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* Copyright (C) 2008-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "OpaqueJSString.h"
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#include "Identifier.h"
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#include "IdentifierInlines.h"
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#include <wtf/text/StringView.h>
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using namespace JSC;
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RefPtr<OpaqueJSString> OpaqueJSString::tryCreate(const String& string)
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{
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if (string.isNull())
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return nullptr;
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return adoptRef(new OpaqueJSString(string));
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}
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RefPtr<OpaqueJSString> OpaqueJSString::tryCreate(String&& string)
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{
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if (string.isNull())
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return nullptr;
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return adoptRef(new OpaqueJSString(WTFMove(string)));
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}
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OpaqueJSString::~OpaqueJSString()
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{
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// m_characters is put in a local here to avoid an extra atomic load.
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UChar* characters = m_characters;
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if (!characters)
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return;
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if (!m_string.is8Bit() && m_string.characters16() == characters)
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return;
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fastFree(characters);
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}
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String OpaqueJSString::string() const
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{
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// Return a copy of the wrapped string, because the caller may make it an Identifier.
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return m_string.isolatedCopy();
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}
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Identifier OpaqueJSString::identifier(VM* vm) const
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{
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if (m_string.isNull())
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return Identifier();
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if (m_string.isEmpty())
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return Identifier(Identifier::EmptyIdentifier);
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if (m_string.is8Bit())
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return Identifier::fromString(*vm, m_string.characters8(), m_string.length());
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return Identifier::fromString(*vm, m_string.characters16(), m_string.length());
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}
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const UChar* OpaqueJSString::characters()
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{
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// m_characters is put in a local here to avoid an extra atomic load.
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UChar* characters = m_characters;
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if (characters)
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return characters;
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if (m_string.isNull())
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return nullptr;
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unsigned length = m_string.length();
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UChar* newCharacters = static_cast<UChar*>(fastMalloc(length * sizeof(UChar)));
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StringView(m_string).getCharactersWithUpconvert(newCharacters);
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if (!m_characters.compare_exchange_strong(characters, newCharacters)) {
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fastFree(newCharacters);
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return characters;
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}
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return newCharacters;
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}
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bool OpaqueJSString::equal(const OpaqueJSString* a, const OpaqueJSString* b)
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{
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if (a == b)
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return true;
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if (!a || !b)
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return false;
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return a->m_string == b->m_string;
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}
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