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/*
* Copyright (C) 2012-2023 Apple Inc. All rights reserved.
* Copyright (C) 2015-2016 Yusuke Suzuki <utatane.tea@gmail.com>.
*
* 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. AND ITS CONTRIBUTORS ``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 ITS 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 "ErrorType.h"
#include "JSString.h"
#include "PrivateName.h"
#include <wtf/Expected.h>
namespace JSC {
class Symbol final : public JSCell {
public:
typedef JSCell Base;
static constexpr unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal | OverridesPut;
DECLARE_EXPORT_INFO;
static constexpr DestructionMode needsDestruction = NeedsDestruction;
template<typename CellType, SubspaceAccess mode>
static GCClient::IsoSubspace* subspaceFor(VM& vm)
{
return vm.symbolSpace<mode>();
}
inline static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
static Symbol* create(VM&);
static Symbol* createWithDescription(VM&, const String&);
JS_EXPORT_PRIVATE static Symbol* create(VM&, SymbolImpl& uid);
SymbolImpl& uid() const { return m_privateName.uid(); }
PrivateName privateName() const { return m_privateName; }
String descriptiveString() const;
String description() const;
Expected<String, ErrorTypeWithExtension> tryGetDescriptiveString() const;
JSValue toPrimitive(JSGlobalObject*, PreferredPrimitiveType) const;
JSObject* toObject(JSGlobalObject*) const;
double toNumber(JSGlobalObject*) const;
static constexpr ptrdiff_t offsetOfSymbolImpl()
{
// PrivateName is just a Ref<SymbolImpl> which can just be used as a SymbolImpl*.
return OBJECT_OFFSETOF(Symbol, m_privateName);
}
private:
static void destroy(JSCell*);
Symbol(VM&);
Symbol(VM&, const String&);
Symbol(VM&, SymbolImpl& uid);
void finishCreation(VM&);
PrivateName m_privateName;
};
Symbol* asSymbol(JSValue);
inline Symbol* asSymbol(JSValue value)
{
ASSERT(value.asCell()->isSymbol());
return jsCast<Symbol*>(value.asCell());
}
} // namespace JSC
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