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/*
* Copyright (C) 2013, 2016 Apple Inc. All rights reserved.
* Copyright (C) 2018 Igalia S.L.
*
* 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 "JSCJSValue.h"
#include "Weak.h"
namespace JSC {
class JSObject;
class JSString;
class WeakHandleOwner;
class JSWeakValue {
public:
JSWeakValue() = default;
~JSWeakValue();
void clear();
bool isClear() const;
bool isSet() const { return m_tag != WeakTypeTag::NotSet; }
bool isPrimitive() const { return m_tag == WeakTypeTag::Primitive; }
bool isObject() const { return m_tag == WeakTypeTag::Object; }
bool isString() const { return m_tag == WeakTypeTag::String; }
void setPrimitive(JSValue);
void setObject(JSObject*, WeakHandleOwner&, void* context);
void setString(JSString*, WeakHandleOwner&, void* context);
JSObject* object() const
{
ASSERT(isObject());
return m_value.object.get();
}
JSValue primitive() const
{
ASSERT(isPrimitive());
return m_value.primitive;
}
JSString* string() const
{
ASSERT(isString());
return m_value.string.get();
}
private:
enum class WeakTypeTag { NotSet, Primitive, Object, String };
WeakTypeTag m_tag { WeakTypeTag::NotSet };
union WeakValueUnion {
WeakValueUnion()
: primitive(JSValue())
{
}
~WeakValueUnion()
{
ASSERT(!primitive);
}
JSValue primitive;
Weak<JSObject> object;
Weak<JSString> string;
} m_value;
};
} // namespace JSC
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