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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.
*/
#ifndef RegisterID_h
#define RegisterID_h
#include "VirtualRegister.h"
#include <wtf/Assertions.h>
#include <wtf/VectorTraits.h>
namespace JSC {
class RegisterID {
WTF_MAKE_NONCOPYABLE(RegisterID);
public:
RegisterID()
: m_refCount(0)
, m_isTemporary(false)
#ifndef NDEBUG
, m_didSetIndex(false)
#endif
{
}
RegisterID(VirtualRegister virtualRegister)
: m_refCount(0)
, m_virtualRegister(virtualRegister)
, m_isTemporary(false)
#ifndef NDEBUG
, m_didSetIndex(true)
#endif
{
}
explicit RegisterID(int index)
: m_refCount(0)
, m_virtualRegister(VirtualRegister(index))
, m_isTemporary(false)
#ifndef NDEBUG
, m_didSetIndex(true)
#endif
{
}
void setIndex(int index)
{
#ifndef NDEBUG
m_didSetIndex = true;
#endif
m_virtualRegister = VirtualRegister(index);
}
void setTemporary()
{
m_isTemporary = true;
}
int index() const
{
ASSERT(m_didSetIndex);
return m_virtualRegister.offset();
}
VirtualRegister virtualRegister() const
{
ASSERT(m_virtualRegister.isValid());
return m_virtualRegister;
}
bool isTemporary()
{
return m_isTemporary;
}
void ref()
{
++m_refCount;
}
void deref()
{
--m_refCount;
ASSERT(m_refCount >= 0);
}
int refCount() const
{
return m_refCount;
}
private:
int m_refCount;
VirtualRegister m_virtualRegister;
bool m_isTemporary;
#ifndef NDEBUG
bool m_didSetIndex;
#endif
};
} // namespace JSC
namespace WTF {
template<> struct VectorTraits<JSC::RegisterID> : VectorTraitsBase<true, JSC::RegisterID> {
static const bool needsInitialization = true;
static const bool canInitializeWithMemset = true; // Default initialization just sets everything to 0 or false, so this is safe.
};
} // namespace WTF
#endif // RegisterID_h
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