sc_signal.h

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/*****************************************************************************

  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2002 by all Contributors.
  All Rights reserved.

  The contents of this file are subject to the restrictions and limitations
  set forth in the SystemC Open Source License Version 2.3 (the "License");
  You may not use this file except in compliance with such restrictions and
  limitations. You may obtain instructions on how to receive a copy of the
  License at http://www.systemc.org/. Software distributed by Contributors
  under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
  ANY KIND, either express or implied. See the License for the specific
  language governing rights and limitations under the License.

 *****************************************************************************/

/*****************************************************************************

  sc_signal.h -- The sc_signal<T> primitive channel class.

  Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21

 *****************************************************************************/

/*****************************************************************************

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

      Name, Affiliation, Date:
  Description of Modification:
    
 *****************************************************************************/

#ifndef SC_SIGNAL_H
#define SC_SIGNAL_H


#include "systemc/communication/sc_port.h"
#include "systemc/communication/sc_prim_channel.h"
#include "systemc/communication/sc_signal_ifs.h"
#include "systemc/kernel/sc_event.h"
#include "systemc/kernel/sc_process_b.h"
#include "systemc/kernel/sc_simcontext.h"
#include "systemc/datatypes/bit/sc_logic.h"
#include "systemc/tracing/sc_trace.h"
#include "systemc/utils/sc_string.h"
#include <typeinfo>

using sc_dt::sc_logic;
using sc_dt::SC_LOGIC_0;
using sc_dt::SC_LOGIC_1;
using sc_dt::SC_LOGIC_Z;
using sc_dt::SC_LOGIC_X;


// to avoid code bloat in sc_signal<T>

extern
void
sc_signal_invalid_writer( const char* name,
			  const char* kind,
			  const char* first_writer,
			  const char* second_writer );


// ----------------------------------------------------------------------------
//  CLASS : sc_signal<T>
//
//  The sc_signal<T> primitive channel class.
// ----------------------------------------------------------------------------

template <class T>
class sc_signal
: public sc_signal_inout_if<T>,
  public sc_prim_channel
{
public:

    // constructors

    sc_signal()
	: sc_prim_channel( sc_gen_unique_name( "signal" ) ),
          m_output( 0 ), m_cur_val( T() ), m_new_val( T() ),
          m_delta( ~sc_dt::UINT64_ONE ), m_writer( 0 )
	{}

    explicit sc_signal( const char* name_ )
	: sc_prim_channel( name_ ),
          m_output( 0 ), m_cur_val( T() ), m_new_val( T() ),
          m_delta( ~sc_dt::UINT64_ONE ), m_writer( 0 )
	{}


    // destructor (does nothing)

    virtual ~sc_signal()
	{}


    // interface methods

    virtual void register_port( sc_port_base&, const char* );


    // get the default event
    virtual const sc_event& default_event() const
	{ return m_value_changed_event; }


    // get the value changed event
    virtual const sc_event& value_changed_event() const
	{ return m_value_changed_event; }


    // read the current value
    virtual const T& read() const
	{ return m_cur_val; }

    // get a reference to the current value (for tracing)
    virtual const T& get_data_ref() const
        { return m_cur_val; }


    // was there an event?
    virtual bool event() const
        { return ( simcontext()->delta_count() == m_delta + 1 ); }

    // write the new value
    virtual void write( const T& );


    // other methods

    operator const T& () const
	{ return read(); }


    sc_signal<T>& operator = ( const T& a )
	{ write( a ); return *this; }

    sc_signal<T>& operator = ( const sc_signal<T>& a )
	{ write( a.read() ); return *this; }


    const T& get_new_value() const
	{ return m_new_val; }


    void trace( sc_trace_file* tf ) const
#ifdef DEBUG_SYSTEMC
	{ ::sc_trace( tf, get_data_ref(), name() ); }
#else
	{}
#endif


    virtual void print( ostream& ) const;
    virtual void dump( ostream& ) const;


    static const char* const kind_string;

    virtual const char* kind() const
        { return kind_string; }

protected:

    virtual void update();

    void check_writer();

protected:

    sc_port_base* m_output; // used for static design rule checking

    T             m_cur_val;
    T             m_new_val;

    sc_event      m_value_changed_event;

    uint64        m_delta; // delta of last event

    sc_process_b* m_writer; // used for dynamic design rule checking

private:

    // disabled
    sc_signal( const sc_signal<T>& );
};


// IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

template <class T>
const char* const sc_signal<T>::kind_string = "sc_signal";


template <class T>
inline
void
sc_signal<T>::register_port( sc_port_base& port_, const char* if_typename_ )
{
#ifdef DEBUG_SYSTEMC
    sc_string nm( if_typename_ );
    if( nm == typeid( sc_signal_inout_if<T> ).name() ) {
	// an out or inout port; only one can be connected
	if( m_output != 0 ) {
	    sc_signal_invalid_writer( name(), kind(),
				      m_output->name(), port_.name() );
	}
	m_output = &port_;
    }
#endif
}


// write the new value

template <class T>
inline
void
sc_signal<T>::write( const T& value_ )
{
#ifdef DEBUG_SYSTEMC
    check_writer();
#endif
    m_new_val = value_;
    if( !( m_new_val == m_cur_val ) ) {
	request_update();
    }
}


template <class T>
inline
void
sc_signal<T>::print( ostream& os ) const
{
    os << m_cur_val;
}

template <class T>
inline
void
sc_signal<T>::dump( ostream& os ) const
{
    os << "     name = " << name() << endl;
    os << "    value = " << m_cur_val << endl;
    os << "new value = " << m_new_val << endl;
}


template <class T>
inline
void
sc_signal<T>::update()
{
    if( !( m_new_val == m_cur_val ) ) {
	m_cur_val = m_new_val;
	m_value_changed_event.notify_delayed();
	m_delta = simcontext()->delta_count();
    }
}


template <class T>
inline
void
sc_signal<T>::check_writer()
{
    sc_process_b* writer = sc_get_curr_process_handle();
    if( m_writer == 0 ) {
	m_writer = writer;
    } else if( m_writer != writer ) {
	sc_signal_invalid_writer( name(), kind(),
				  m_writer->name(), writer->name() );
    }
}


// ----------------------------------------------------------------------------
//  CLASS : sc_signal<bool>
//
//  Specialization of sc_signal<T> for type bool.
// ----------------------------------------------------------------------------

template <>
class sc_signal<bool>
: public sc_signal_inout_if<bool>,
  public sc_prim_channel
{
public:

    // constructors

    sc_signal()
	: sc_prim_channel( sc_gen_unique_name( "signal" ) ),
          m_output( 0 ),
          m_cur_val( false ),
          m_new_val( false ),
          m_delta( ~sc_dt::UINT64_ONE ),
          m_writer( 0 )
	{}

    explicit sc_signal( const char* name_ )
	: sc_prim_channel( name_ ),
          m_output( 0 ),
          m_cur_val( false ),
          m_new_val( false ),
          m_delta( ~sc_dt::UINT64_ONE ),
          m_writer( 0 )
	{}


    // destructor (does nothing)

    virtual ~sc_signal()
	{}


    // interface methods

    virtual void register_port( sc_port_base&, const char* );


    // get the default event
    virtual const sc_event& default_event() const
	{ return m_value_changed_event; }


    // get the value changed event
    virtual const sc_event& value_changed_event() const
	{ return m_value_changed_event; }

    // get the positive edge event
    virtual const sc_event& posedge_event() const
	{ return m_posedge_event; }

    // get the negative edge event
    virtual const sc_event& negedge_event() const
	{ return m_negedge_event; }


    // read the current value
    virtual const bool& read() const
	{ return m_cur_val; }

    // get a reference to the current value (for tracing)
    virtual const bool& get_data_ref() const
        { return m_cur_val; }


    // was there a value changed event?
    virtual bool event() const
        { return ( simcontext()->delta_count() == m_delta + 1 ); }

    // was there a positive edge event?
    virtual bool posedge() const
	{ return ( event() && m_cur_val ); }

    // was there a negative edge event?
    virtual bool negedge() const
	{ return ( event() && ! m_cur_val ); }


    // write the new value
    virtual void write( const bool& );


    // delayed evaluation
    virtual const sc_signal_bool_deval& delayed() const;


    // other methods

    operator const bool& () const
	{ return read(); }


    sc_signal<bool>& operator = ( const bool& a )
	{ write( a ); return *this; }

    sc_signal<bool>& operator = ( const sc_signal<bool>& a )
	{ write( a.read() ); return *this; }


    const bool& get_new_value() const
	{ return m_new_val; }


    void trace( sc_trace_file* tf ) const
#ifdef DEBUG_SYSTEMC
	{ ::sc_trace( tf, get_data_ref(), name() ); }
#else
	{}
#endif