ltl2ba-nix/trans.c

176 lines
5.1 KiB
C

/***** ltl2ba : trans.c *****/
/* Written by Denis Oddoux, LIAFA, France */
/* Copyright (c) 2001 Denis Oddoux */
/* Modified by Paul Gastin, LSV, France */
/* Copyright (c) 2007 Paul Gastin */
/* */
/* This program is free software; you can redistribute it and/or modify */
/* it 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*/
/* */
/* Based on the translation algorithm by Gastin and Oddoux, */
/* presented at the 13th International Conference on Computer Aided */
/* Verification, CAV 2001, Paris, France. */
/* Proceedings - LNCS 2102, pp. 53-65 */
/* */
/* Send bug-reports and/or questions to Paul Gastin */
/* http://www.lsv.ens-cachan.fr/~gastin */
/* */
/* Some of the code in this file was taken from the Spin software */
/* Written by Gerard J. Holzmann, Bell Laboratories, U.S.A. */
#include "ltl2ba.h"
extern int tl_verbose, tl_terse, tl_errs;
extern FILE *tl_out;
int Stack_mx=0, Max_Red=0, Total=0;
static char dumpbuf[2048];
#ifdef NXT
int
only_nxt(Node *n)
{
switch (n->ntyp) {
case NEXT:
return 1;
case OR:
case AND:
return only_nxt(n->rgt) && only_nxt(n->lft);
default:
return 0;
}
}
#endif
int
dump_cond(Node *pp, Node *r, int first)
{ Node *q;
int frst = first;
if (!pp) return frst;
q = dupnode(pp);
q = rewrite(q);
if (q->ntyp == PREDICATE
|| q->ntyp == NOT
#ifndef NXT
|| q->ntyp == OR
#endif
|| q->ntyp == FALSE)
{ if (!frst) fprintf(tl_out, " && ");
dump(q);
frst = 0;
#ifdef NXT
} else if (q->ntyp == OR)
{ if (!frst) fprintf(tl_out, " && ");
fprintf(tl_out, "((");
frst = dump_cond(q->lft, r, 1);
if (!frst)
fprintf(tl_out, ") || (");
else
{ if (only_nxt(q->lft))
{ fprintf(tl_out, "1))");
return 0;
}
}
frst = dump_cond(q->rgt, r, 1);
if (frst)
{ if (only_nxt(q->rgt))
fprintf(tl_out, "1");
else
fprintf(tl_out, "0");
frst = 0;
}
fprintf(tl_out, "))");
#endif
} else if (q->ntyp == V_OPER
&& !anywhere(AND, q->rgt, r))
{ frst = dump_cond(q->rgt, r, frst);
} else if (q->ntyp == AND)
{
frst = dump_cond(q->lft, r, frst);
frst = dump_cond(q->rgt, r, frst);
}
return frst;
}
static void
sdump(Node *n)
{
switch (n->ntyp) {
case PREDICATE: strcat(dumpbuf, n->sym->name);
break;
case U_OPER: strcat(dumpbuf, "U");
goto common2;
case V_OPER: strcat(dumpbuf, "V");
goto common2;
case OR: strcat(dumpbuf, "|");
goto common2;
case AND: strcat(dumpbuf, "&");
common2: sdump(n->rgt);
common1: sdump(n->lft);
break;
#ifdef NXT
case NEXT: strcat(dumpbuf, "X");
goto common1;
#endif
case NOT: strcat(dumpbuf, "!");
goto common1;
case TRUE: strcat(dumpbuf, "T");
break;
case FALSE: strcat(dumpbuf, "F");
break;
default: strcat(dumpbuf, "?");
break;
}
}
Symbol *
DoDump(Node *n)
{
if (!n) return ZS;
if (n->ntyp == PREDICATE)
return n->sym;
dumpbuf[0] = '\0';
sdump(n);
return tl_lookup(dumpbuf);
}
void trans(Node *p)
{
if (!p || tl_errs) return;
if (tl_verbose || tl_terse) {
fprintf(tl_out, "\t/* Normlzd: ");
dump(p);
fprintf(tl_out, " */\n");
}
if (tl_terse)
return;
mk_alternating(p);
mk_generalized();
mk_buchi();
}