xref: /gem5/src/systemc/dt/bit/sc_logic.cc

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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
  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 20:20:04  acg
// SystemC 2.3
//
// 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 <sstream>

#include "systemc/ext/dt/bit/messages.hh"
#include "systemc/ext/dt/bit/sc_logic.hh"
#include "systemc/ext/utils/sc_report_handler.hh"

namespace sc_dt
{

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

// support methods
void
sc_logic::invalid_value(sc_logic_value_t v)
{
    invalid_value((int)v);
}

void
sc_logic::invalid_value(char c)
{
    std::stringstream msg;
    msg << "sc_logic('" << c << "')";
    SC_REPORT_ERROR(sc_core::SC_ID_VALUE_NOT_VALID_, msg.str().c_str());
}

void
sc_logic::invalid_value(int i)
{
    std::stringstream msg;
    msg << "sc_logic(" << i << ")";
    SC_REPORT_ERROR(sc_core::SC_ID_VALUE_NOT_VALID_, msg.str().c_str());
}


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