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/*
* Copyright (c) 2004-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* 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;
* neither the name of the copyright holders 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER 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.
*/
#ifndef __SIM_VPTR_HH__
#define __SIM_VPTR_HH__
#include "mem/port_proxy.hh"
class ThreadContext;
template <class T>
class VPtr
{
public:
typedef T Type;
protected:
ThreadContext *tc;
Addr ptr;
Addr buffer[(sizeof(T)-1)/sizeof(Addr) + 1];
public:
explicit VPtr(ThreadContext *_tc, Addr p = 0)
: tc(_tc), ptr(p)
{
refresh();
}
template <class U>
VPtr(const VPtr<U> &vp)
: tc(vp.tc), ptr(vp.ptr)
{
refresh();
}
~VPtr()
{}
void
refresh()
{
if (!ptr)
return;
PortProxy &proxy = tc->getVirtProxy();
proxy.readBlob(ptr, buffer, sizeof(T));
}
bool
operator!() const
{
return ptr == 0;
}
VPtr<T>
operator+(int offset)
{
return VPtr<T>(tc, ptr + offset);
}
const VPtr<T> &
operator+=(int offset)
{
ptr += offset;
refresh();
return *this;
}
const VPtr<T> &
operator=(Addr p)
{
ptr = p;
refresh();
return *this;
}
template <class U>
const VPtr<T> &
operator=(const VPtr<U> &vp)
{
tc = vp.tc;
ptr = vp.ptr;
refresh();
return *this;
}
operator T *()
{
return (T *)buffer;
}
T *
operator->()
{
return (T *)buffer;
}
T &
operator*()
{
return *(T *)buffer;
}
};
#endif // __SIM_VPTR_HH__