sc_logic.cpp

system C源码 一种替代verilog的语言

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

  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2006 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 2.4 (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_logic.cpp -- C++ implementation of logic type. Behaves
                  pretty much the same way as HDLs logic type.

  Original Author: Stan Y. Liao, Synopsys, Inc.

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

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

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

      Name, Affiliation, Date:
  Description of Modification:

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// $Log: sc_logic.cpp,v $
// Revision 1.1.1.1  2006/12/15 20:31:36  acg
// SystemC 2.2
//
// Revision 1.3  2006/01/13 18:53:53  acg
// Andy Goodrich: added $Log command so that CVS comments are reproduced in
// the source.
//

#include "sysc/utils/sc_string.h"
#include "sysc/datatypes/bit/sc_bit_ids.h"
#include "sysc/datatypes/bit/sc_logic.h"


namespace sc_dt
{

// ----------------------------------------------------------------------------
//  CLASS : sc_logic
//
//  Four-valued logic type.
// ----------------------------------------------------------------------------

// support methods

void
sc_logic::invalid_value( sc_logic_value_t v )
{
    char msg[BUFSIZ];
    std::sprintf( msg, "sc_logic( %d )", v );
    SC_REPORT_ERROR( sc_core::SC_ID_VALUE_NOT_VALID_, msg );
}

void
sc_logic::invalid_value( char c )
{
    char msg[BUFSIZ];
    std::sprintf( msg, "sc_logic( '%c' )", c );
    SC_REPORT_ERROR( sc_core::SC_ID_VALUE_NOT_VALID_, msg );
}

void
sc_logic::invalid_value( int i )
{
    char msg[BUFSIZ];
    std::sprintf( msg, "sc_logic( %d )", i );
    SC_REPORT_ERROR( sc_core::SC_ID_VALUE_NOT_VALID_, msg );
}


void
sc_logic::invalid_01() const
{
    if( (int) m_val == Log_Z ) {
	SC_REPORT_WARNING( sc_core::SC_ID_LOGIC_Z_TO_BOOL_, 0 );
    } else {
	SC_REPORT_WARNING( sc_core::SC_ID_LOGIC_X_TO_BOOL_, 0 );
    }
}


// conversion tables

const sc_logic_value_t sc_logic::char_to_logic[128] =
{
    Log_0, Log_1, Log_Z, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_0, Log_1, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_Z, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X, Log_X,
    Log_X, Log_X, Log_Z, Log_X, Log_X, Log_X, Log_X, Log_X
};

const char sc_logic::logic_to_char[4] = { '0', '1', 'Z', 'X' };

const sc_logic_value_t sc_logic::and_table[4][4] =
{
    { Log_0, Log_0, Log_0, Log_0 },
    { Log_0, Log_1, Log_X, Log_X },
    { Log_0, Log_X, Log_X, Log_X },
    { Log_0, Log_X, Log_X, Log_X }
};

const sc_logic_value_t sc_logic::or_table[4][4] =
{
    { Log_0, Log_1, Log_X, Log_X },
    { Log_1, Log_1, Log_1, Log_1 },
    { Log_X, Log_1, Log_X, Log_X },
    { Log_X, Log_1, Log_X, Log_X }
};

const sc_logic_value_t sc_logic::xor_table[4][4] =
{
    { Log_0, Log_1, Log_X, Log_X },
    { Log_1, Log_0, Log_X, Log_X },
    { Log_X, Log_X, Log_X, Log_X },
    { Log_X, Log_X, Log_X, Log_X }
};

const sc_logic_value_t sc_logic::not_table[4] =
    { Log_1, Log_0, Log_X, Log_X  };


// other methods

void
sc_logic::scan( ::std::istream& is )
{
    char c;
    is >> c;
    *this = c;
}


// #ifdef SC_DT_DEPRECATED
const sc_logic sc_logic_0( Log_0 );
const sc_logic sc_logic_1( Log_1 );
const sc_logic sc_logic_Z( Log_Z );
const sc_logic sc_logic_X( Log_X );
// #endif

const sc_logic SC_LOGIC_0( Log_0 );
const sc_logic SC_LOGIC_1( Log_1 );
const sc_logic SC_LOGIC_Z( Log_Z );
const sc_logic SC_LOGIC_X( Log_X );

} // namespace sc_dt