iverilog/vvp/logic.cc

/*
 * Copyright (c) 2001 Stephen Williams (steve@icarus.com)
 *
 *    This source code is free software; you can redistribute it
 *    and/or modify it in source code form under the terms of the GNU
 *    General Public License as published by the Free Software
 *    Foundation; either version 2 of the License, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */
#if !defined(WINNT)
#ident "$Id: logic.cc,v 1.5 2001/12/14 02:04:49 steve Exp $"
#endif

# include  "logic.h"
# include  "compile.h"
# include  "bufif.h"
# include  "npmos.h"

# include  <string.h>
# include  <assert.h>
# include  <stdlib.h>
#ifdef HAVE_MALLOC_H
# include  <malloc.h>
#endif

/*
 *   Implementation of the table functor, which provides logic with up
 *   to 4 inputs.
 */

table_functor_s::table_functor_s(truth_t t, unsigned str0, unsigned str1) 
: table(t) 
{
      assert(str0 <= 7);
      assert(str1 <= 7);
      odrive0 = str0;
      odrive1 = str1;
}

table_functor_s::~table_functor_s() 
{}

void table_functor_s::set(vvp_ipoint_t ptr, bool push, unsigned v, unsigned)
{
      put(ptr, v);

	/* Locate the new output value in the table. */
      unsigned char val = table[ival >> 2];
      val >>= 2 * (ival&0x03);
      val &= 0x03;

      put_oval(val, push);
}

/*
 * The parser calls this function to create a logic functor. I allocate a
 * functor, and map the name to the vvp_ipoint_t address for the
 * functor. Also resolve the inputs to the functor.
 */

void compile_functor(char*label, char*type,
		     vvp_delay_t delay, unsigned ostr0, unsigned ostr1,
		     unsigned argc, struct symb_s*argv)
{
      functor_t obj;

      if (strcmp(type, "OR") == 0) {
	    obj = new table_functor_s(ft_OR, ostr0, ostr1);

      } else if (strcmp(type, "AND") == 0) {
	    obj = new table_functor_s(ft_AND, ostr0, ostr1);

      } else if (strcmp(type, "BUF") == 0) {
	    obj = new table_functor_s(ft_BUF, ostr0, ostr1);

      } else if (strcmp(type, "BUFIF0") == 0) {
	    obj = new vvp_bufif0_s;

      } else if (strcmp(type, "BUFIF1") == 0) {
	    obj = new vvp_bufif1_s;

      } else if (strcmp(type, "PMOS") == 0) {
	    obj = new vvp_pmos_s;

      } else if (strcmp(type, "NMOS") == 0) {
	    obj= new vvp_nmos_s;

      } else if (strcmp(type, "RPMOS") == 0) {
	    obj = new vvp_rpmos_s;

      } else if (strcmp(type, "RNMOS") == 0) {
	    obj = new vvp_rnmos_s;

      } else if (strcmp(type, "MUXZ") == 0) {
	    obj = new table_functor_s(ft_MUXZ);

      } else if (strcmp(type, "EEQ") == 0) {
	    obj = new table_functor_s(ft_EEQ);

      } else if (strcmp(type, "NAND") == 0) {
	    obj = new table_functor_s(ft_NAND, ostr0, ostr1);

      } else if (strcmp(type, "NOR") == 0) {
	    obj = new table_functor_s(ft_NOR, ostr0, ostr1);

      } else if (strcmp(type, "NOT") == 0) {
	    obj = new table_functor_s(ft_NOT, ostr0, ostr1);

      } else if (strcmp(type, "XNOR") == 0) {
	    obj = new table_functor_s(ft_XNOR, ostr0, ostr1);

      } else if (strcmp(type, "XOR") == 0) {
	    obj = new table_functor_s(ft_XOR, ostr0, ostr1);

      } else {
	    yyerror("invalid functor type.");
	    free(type);
	    free(argv);
	    free(label);
	    return;
      }

      free(type);

      assert(argc <= 4);
      vvp_ipoint_t fdx = functor_allocate(1);
      functor_define(fdx, obj);
      define_functor_symbol(label, fdx);
      free(label);

      obj->delay = delay;

      inputs_connect(fdx, argc, argv);
      free(argv);
}


/*
 * $Log: logic.cc,v $
 * Revision 1.5  2001/12/14 02:04:49  steve
 *  Support strength syntax on functors.
 *
 * Revision 1.4  2001/12/06 03:31:24  steve
 *  Support functor delays for gates and UDP devices.
 *  (Stephan Boettcher)
 *
 * Revision 1.3  2001/11/16 04:22:27  steve
 *  include stdlib.h for portability.
 *
 * Revision 1.2  2001/11/07 03:34:42  steve
 *  Use functor pointers where vvp_ipoint_t is unneeded.
 *
 * Revision 1.1  2001/11/06 03:07:22  steve
 *  Code rearrange. (Stephan Boettcher)
 *
 */