sc_logic.cpp

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  source code Copyright (c) 1996-2006 by all Contributors.
  All Rights reserved.

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  set forth in the SystemC Open Source License Version 2.4 (the "License");
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/*****************************************************************************

  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
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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

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