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/*
* Copyright (C) 2020 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.
*/
#pragma once
#include "CacheableIdentifier.h"
#include "Identifier.h"
#include "JSCJSValueInlines.h"
#include "JSCell.h"
#include "VM.h"
#include <wtf/text/UniquedStringImpl.h>
namespace JSC {
inline CacheableIdentifier CacheableIdentifier::createFromIdentifierOwnedByCodeBlock(CodeBlock* codeBlock, const Identifier& i)
{
return createFromIdentifierOwnedByCodeBlock(codeBlock, i.impl());
}
inline CacheableIdentifier CacheableIdentifier::createFromIdentifierOwnedByCodeBlock(CodeBlock* codeBlock, UniquedStringImpl* uid)
{
UNUSED_PARAM(codeBlock);
#if ASSERT_ENABLED
bool found = false;
for (unsigned index = 0; index < codeBlock->numberOfIdentifiers(); ++index) {
const Identifier& identifier = codeBlock->identifier(index);
if (identifier.impl() == uid) {
found = true;
break;
}
}
ASSERT(found);
#endif
return CacheableIdentifier(uid);
}
inline CacheableIdentifier CacheableIdentifier::createFromImmortalIdentifier(UniquedStringImpl* uid)
{
return CacheableIdentifier(uid);
}
inline CacheableIdentifier CacheableIdentifier::createFromCell(JSCell* i)
{
return CacheableIdentifier(i);
}
inline CacheableIdentifier::CacheableIdentifier(UniquedStringImpl* uid)
{
setUidBits(uid);
}
inline CacheableIdentifier::CacheableIdentifier(JSCell* identifier)
{
ASSERT(isCacheableIdentifierCell(identifier));
setCellBits(identifier);
}
inline JSCell* CacheableIdentifier::cell() const
{
ASSERT(isCell());
return bitwise_cast<JSCell*>(m_bits);
}
inline UniquedStringImpl* CacheableIdentifier::uid() const
{
if (!m_bits)
return nullptr;
if (isUid())
return bitwise_cast<UniquedStringImpl*>(m_bits & ~s_uidTag);
if (isSymbolCell())
return &jsCast<Symbol*>(cell())->uid();
ASSERT(isStringCell());
JSString* string = jsCast<JSString*>(cell());
return bitwise_cast<UniquedStringImpl*>(string->getValueImpl());
}
inline bool CacheableIdentifier::isCacheableIdentifierCell(JSCell* cell)
{
if (cell->isSymbol())
return true;
if (!cell->isString())
return false;
JSString* string = jsCast<JSString*>(cell);
if (const StringImpl* impl = string->tryGetValueImpl())
return impl->isAtom();
return false;
}
inline bool CacheableIdentifier::isCacheableIdentifierCell(JSValue value)
{
if (!value.isCell())
return false;
return isCacheableIdentifierCell(value.asCell());
}
inline bool CacheableIdentifier::isSymbolCell() const
{
return isCell() && cell()->isSymbol();
}
inline bool CacheableIdentifier::isStringCell() const
{
return isCell() && cell()->isString();
}
inline void CacheableIdentifier::setCellBits(JSCell* cell)
{
RELEASE_ASSERT(isCacheableIdentifierCell(cell));
m_bits = bitwise_cast<uintptr_t>(cell);
}
inline void CacheableIdentifier::setUidBits(UniquedStringImpl* uid)
{
m_bits = bitwise_cast<uintptr_t>(uid) | s_uidTag;
}
inline void CacheableIdentifier::visitAggregate(SlotVisitor& visitor) const
{
if (m_bits && isCell())
visitor.appendUnbarriered(cell());
}
inline bool CacheableIdentifier::operator==(const CacheableIdentifier& other) const
{
return uid() == other.uid();
}
inline bool CacheableIdentifier::operator!=(const CacheableIdentifier& other) const
{
return uid() != other.uid();
}
inline bool CacheableIdentifier::operator==(const Identifier& other) const
{
return uid() == other.impl();
}
} // namespace JSC