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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 Computer, 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.
*/
#ifndef LabelScope_h
#define LabelScope_h
#include <wtf/PassRefPtr.h>
#include "Label.h"
namespace JSC {
class Identifier;
class LabelScope {
public:
enum Type { Loop, Switch, NamedLabel };
LabelScope(Type type, const Identifier* name, int scopeDepth, PassRefPtr<Label> breakTarget, PassRefPtr<Label> continueTarget)
: m_refCount(0)
, m_type(type)
, m_name(name)
, m_scopeDepth(scopeDepth)
, m_breakTarget(breakTarget)
, m_continueTarget(continueTarget)
{
}
int refCount() const { return m_refCount; }
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; }
private:
friend class LabelScopePtr;
void ref() { ++m_refCount; }
void deref()
{
--m_refCount;
ASSERT(m_refCount >= 0);
}
int m_refCount;
Type m_type;
const Identifier* m_name;
int m_scopeDepth;
RefPtr<Label> m_breakTarget;
RefPtr<Label> m_continueTarget;
};
typedef Vector<LabelScope, 8> LabelScopeStore;
class LabelScopePtr {
public:
LabelScopePtr()
: m_owner(0)
, m_index(0)
{
}
LabelScopePtr(LabelScopeStore* owner, size_t index)
: m_owner(owner)
, m_index(index)
{
m_owner->at(index).ref();
}
LabelScopePtr(const LabelScopePtr& other)
: m_owner(other.m_owner)
, m_index(other.m_index)
{
if (m_owner)
m_owner->at(m_index).ref();
}
const LabelScopePtr& operator=(const LabelScopePtr& other)
{
if (other.m_owner)
other.m_owner->at(other.m_index).ref();
if (m_owner)
m_owner->at(m_index).deref();
m_owner = other.m_owner;
m_index = other.m_index;
return *this;
}
~LabelScopePtr()
{
if (m_owner)
m_owner->at(m_index).deref();
}
LabelScope& operator*() { ASSERT(m_owner); return m_owner->at(m_index); }
LabelScope* operator->() { ASSERT(m_owner); return &m_owner->at(m_index); }
const LabelScope& operator*() const { ASSERT(m_owner); return m_owner->at(m_index); }
const LabelScope* operator->() const { ASSERT(m_owner); return &m_owner->at(m_index); }
private:
LabelScopeStore* m_owner;
size_t m_index;
};
} // namespace JSC
#endif // LabelScope_h
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