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OpaqueJSString.cpp
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110 lines (90 loc) · 3.46 KB
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/*
* Copyright (C) 2008-2019 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"
#include "OpaqueJSString.h"
#include "Identifier.h"
#include "IdentifierInlines.h"
#include <wtf/MallocSpan.h>
#include <wtf/text/StringView.h>
using namespace JSC;
RefPtr<OpaqueJSString> OpaqueJSString::tryCreate(const String& string)
{
if (string.isNull())
return nullptr;
return adoptRef(new OpaqueJSString(String { string }));
}
RefPtr<OpaqueJSString> OpaqueJSString::tryCreate(String&& string)
{
if (string.isNull())
return nullptr;
return adoptRef(new OpaqueJSString(WTF::move(string)));
}
OpaqueJSString::~OpaqueJSString()
{
// m_characters is put in a local here to avoid an extra atomic load.
char16_t* characters = m_characters;
if (!characters)
return;
if (!m_string.is8Bit() && m_string.span16().data() == characters)
return;
fastFree(characters);
}
String OpaqueJSString::string() const
{
// Return a copy of the wrapped string, because the caller may make it an Identifier.
return m_string.isolatedCopy();
}
Identifier OpaqueJSString::identifier(VM* vm) const
{
if (m_string.isNull())
return Identifier();
if (m_string.isEmpty())
return Identifier(Identifier::EmptyIdentifierFlag::EmptyIdentifier);
if (m_string.is8Bit())
return Identifier::fromString(*vm, m_string.span8());
return Identifier::fromString(*vm, m_string.span16());
}
const char16_t* OpaqueJSString::characters() LIFETIME_BOUND
{
// m_characters is put in a local here to avoid an extra atomic load.
char16_t* characters = m_characters;
if (characters)
return characters;
if (m_string.isNull())
return nullptr;
auto newCharacters = MallocSpan<char16_t>::malloc(m_string.length() * sizeof(char16_t));
StringView { m_string }.getCharacters(newCharacters.mutableSpan());
if (!m_characters.compare_exchange_strong(characters, newCharacters.mutableSpan().data()))
return characters;
return newCharacters.leakSpan().data();
}
bool OpaqueJSString::equal(const OpaqueJSString* a, const OpaqueJSString* b)
{
if (a == b)
return true;
if (!a || !b)
return false;
return a->m_string == b->m_string;
}