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/*
* Copyright (C) 2008 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE 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 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 "Label.h"
namespace JSC {
class Identifier;
class LabelScope {
WTF_MAKE_NONCOPYABLE(LabelScope);
public:
enum Type { Loop, Switch, NamedLabel };
LabelScope(Type type, const Identifier* name, int scopeDepth, Ref<Label>&& breakTarget, RefPtr<Label>&& continueTarget)
: m_refCount(0)
, m_type(type)
, m_name(name)
, m_scopeDepth(scopeDepth)
, m_breakTarget(WTFMove(breakTarget))
, m_continueTarget(WTFMove(continueTarget))
{
}
Label& breakTarget() const { return m_breakTarget.get(); }
Label* continueTarget() const { return m_continueTarget.get(); }
Type type() const { return m_type; }
const Identifier* name() const { return m_name; }
int scopeDepth() const { return m_scopeDepth; }
void ref() { ++m_refCount; }
void deref()
{
--m_refCount;
ASSERT(m_refCount >= 0);
}
int refCount() const { return m_refCount; }
bool hasOneRef() const { return m_refCount == 1; }
bool breakTargetMayBeBound() const
{
if (!hasOneRef())
return true;
if (!m_breakTarget->hasOneRef())
return true;
return m_breakTarget->isBound();
}
private:
int m_refCount;
Type m_type;
const Identifier* m_name;
int m_scopeDepth;
Ref<Label> m_breakTarget;
RefPtr<Label> m_continueTarget;
};
} // namespace JSC
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