PortState.hh

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/*
    Copyright (c) 2002-2009 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
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    the rights to use, copy, modify, merge, publish, distribute, sublicense,
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    Software is furnished to do so, subject to the following conditions:
 
    The above copyright notice and this permission notice shall be included in
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    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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/**
 * @file PortState.hh
 *
 * Declaration of PortState class.
 *
 * @author Jussi Nykänen 2004 (nykanen-no.spam-cs.tut.fi)
 * @author Pekka Jääskeläinen 2005 (pjaaskel-no.spam-cs.tut.fi)
 * @note rating: red
 */
 
#ifndef TTA_PORT_STATE_HH
#define TTA_PORT_STATE_HH
 
#include <string>
 
#include "RegisterState.hh"
#include "Application.hh"
 
class FUState;
 
//////////////////////////////////////////////////////////////////////////////
// PortState
//////////////////////////////////////////////////////////////////////////////
 
/**
 * Models port of function unit.
 */
class PortState : public RegisterState {
public:
    PortState(FUState& parent, int width);
    PortState(FUState& parent, SimValue& sharedRegister);
    virtual ~PortState();
 
    virtual FUState& parent() const;
 
protected:
    /// Parent of the port.
    FUState* parent_;
private:
    /// Copying not allowed.
    PortState(const PortState&);
    /// Assignment not allowed.
    PortState& operator=(const PortState&);    
};
 
//////////////////////////////////////////////////////////////////////////////
// NullPortState
//////////////////////////////////////////////////////////////////////////////
 
/**
 * Models non-existing PortState.
 */
class NullPortState : public PortState {
public:
    static NullPortState& instance();
 
    virtual ~NullPortState();
    
    virtual void setValue(const SimValue& value);
    virtual const SimValue& value() const;
    virtual FUState& parent() const;
 
private:
    NullPortState();
    /// Copying not allowed.
    NullPortState(const NullPortState&);
    /// Assignment not allowed.
    NullPortState& operator=(const NullPortState&);
 
    /// Unique instance of NullPortState class.
    static NullPortState* instance_;
};
 
#endif