int main (int argc, char ** argv) {
int i, * p, n, oldn, red, nonred, res, round, printed, len;
const char * err;
const int * q;
char * cmd;
Cls * c;
#ifndef NDEBUG
int tmp;
#endif
start = picosat_time_stamp ();
for (i = 1; i < argc; i++) {
if (!strcmp (argv[i], "-h")) {
fputs (USAGE, stdout);
exit (0);
} else if (!strcmp (argv[i], "-v")) {
if (verbose < 0) die ("'-v' option after '-q'");
verbose++;
} else if (!strcmp (argv[i], "-q")) {
if (verbose < 0) die ("two '-q' options");
if (verbose > 0) die ("'-q' option after '-v'");
verbose = -1;
} else if (!strcmp (argv[i], "-n")) nowitness = 1;
else if (argv[i][0] == '-' && argv[i][1])
die ("invalid command line option '%s'", argv[i]);
else if (output_name) die ("too many arguments");
else if (!input_name) input_name = argv[i];
else output_name = argv[i];
}
if (!output_name) warn ("no output file given");
if (input_name && strcmp (input_name, "-")) {
len = strlen (input_name);
if (len >= 3 && !strcmp (input_name + len - 3, ".gz")) {
cmd = malloc (len + 20);
sprintf (cmd, "gunzip -c %s 2>/dev/null", input_name);
input_file = popen (cmd, "r");
pclose_input = 1;
free (cmd);
} else input_file = fopen (input_name, "r"), fclose_input = 1;
if (!input_file) die ("can not read '%s'", input_name);
} else input_file = stdin, input_name = "-";
if ((err = parse ())) {
fprintf (stdout, "%s:%d: %s\n", input_name, lineno, err);
fflush (stdout);
exit (1);
}
if (fclose_input) fclose (input_file);
if (pclose_input) pclose (input_file);
ps = picosat_init ();
picosat_set_prefix (ps, "c [picosat] ");
picosat_set_output (ps, stdout);
if (verbose > 1) picosat_set_verbosity (ps, verbose - 1);
printed = 0;
if (!picosat_enable_trace_generation (ps))
warn ("PicoSAT compiled without trace generation"),
warn ("core extraction disabled");
else {
n = nclauses;
nonred = 0;
for (round = 1; round <= MAXCOREROUNDS; round++) {
if (verbose > 1)
msg (1, "starting core extraction round %d", round);
picosat_set_seed (ps, round);
for (i = 0; i < nclauses; i++) {
c = clauses + i;
if (c->red) {
picosat_add (ps, 1);
picosat_add (ps, -1);
} else {
for (p = c->lits; *p; p++)
picosat_add (ps, *p);
}
#ifndef NDEBUG
tmp =
#endif
picosat_add (ps, 0);
assert (tmp == i);
}
res = picosat_sat (ps, -1);
if (res == 10) { assert (round == 1); goto SAT; }
assert (res == 20);
if (!printed) {
assert (round == 1);
printed = 1;
if (verbose >= 0)
printf ("s UNSATISFIABLE\n"),
fflush (stdout);
}
for (i = 0; i < nclauses; i++) {
c = clauses + i;
if (c->red) { assert (!picosat_coreclause (ps, i)); continue; }
if (picosat_coreclause (ps, i)) continue;
c->red = 1;
}
oldn = n;
n = 0;
for (i = 0; i < nclauses; i++) if (!clauses[i].red) n++;
msg (1, "extracted core %d of size %d = %0.f%% out of %d after %.1f sec",
round, n, percent (n, nclauses), nclauses,
picosat_time_stamp () - start);
assert (oldn >= n);
picosat_reset (ps);
ps = picosat_init ();
picosat_set_prefix (ps, "c [picosat] ");
picosat_set_output (ps, stdout);
if (round >= MINCOREROUNDS) {
red = oldn - n;
if (red < 10 && (100*red + 99)/oldn < 2) {
nonred++;
if (nonred > MAXNONREDROUNDS) break;
}
}
if (round < MAXCOREROUNDS) picosat_enable_trace_generation (ps);
}
}
for (i = 0; i < nclauses; i++) {
c = clauses + i;
if (c->red) {
picosat_add (ps, 1);
picosat_add (ps, -1);
#ifndef NDEBUG
tmp =
#endif
picosat_add (ps, 0);
assert (tmp == i);
continue;
}
c->lit = nvars + i + 1;
picosat_add (ps, -c->lit);
for (p = c->lits; *p; p++)
(void) picosat_add (ps, *p);
#ifndef NDEBUG
tmp =
#endif
picosat_add (ps, 0);
assert (tmp == i);
}
for (i = 0; i < nclauses; i++) {
c = clauses + i;
if (c->red) continue;
picosat_assume (ps, c->lit);
}
res = picosat_sat (ps, -1);
if (res == 20) {
if (!printed && verbose >= 0)
printf ("s UNSATISFIABLE\n"), fflush (stdout);
for (i = 0; i < nclauses; i++) clauses[i].red = 1;
q = picosat_mus_assumptions (ps, 0, callback, 1);
while ((i = *q++)) {
i -= nvars + 1;
assert (0 <= i && i < nclauses);
clauses[i].red = 0;
}
} else {
SAT:
assert (res == 10);
if (!printed && verbose >= 0)
printf ("s SATISFIABLE\n"), fflush (stdout);
if (!nowitness && verbose >= 0) {
for (i = 1; i <= nvars; i++)
printf ("v %d\n", ((picosat_deref (ps, i) < 0) ? -1 : 1) * i);
printf ("v 0\n");
}
}
if (verbose > 0) picosat_stats (ps);
picosat_reset (ps);
n = 0;
for (i = 0; i < nclauses; i++) if (!clauses[i].red) n++;
red = nclauses - n;
msg (1, "found %d redundant clauses %.0f%%", red, percent (red, nclauses));
if (res == 20)
msg (0, "computed MUS of size %d out of %d (%.0f%%)",
n, nclauses, percent (n, nclauses));
if (output_name && strcmp (output_name, "-")) {
output_file = fopen (output_name, "w");
if (!output_file) die ("can not write '%s'", output_name);
close_output = 1;
} else if (output_name && !strcmp (output_name, "-")) output_file = stdout;
if (output_file) {
fprintf (output_file, "p cnf %d %d\n", nvars, n);
for (i = 0; i < nclauses; i++)
if (!clauses[i].red) {
for (p = clauses[i].lits; *p; p++) fprintf (output_file, "%d ", *p);
fprintf (output_file, "0\n");
}
if (close_output) fclose (output_file);
}
if (res == 20) {
if (!nowitness && verbose >= 0) {
for (i = 0; i < nclauses; i++)
if (!clauses[i].red) printf ("v %d\n", i+1);
printf ("v 0\n");
}
}
msg (1, "%s %d irredundant clauses %.0f%%",
output_file ? "printed" : "computed", n, percent (n, nclauses));
for (i = 0; i < nclauses; i++) free (clauses[i].lits);
free (clauses);
free (lits);
msg (1, "%d reductions in %.1f seconds",
reductions, picosat_time_stamp () - start);
return res;
}
int main (int argc, char ** argv) {
int ch, nvars, sclauses, nclauses, sign, lit, group, res;
const int * mus, * p;
FILE * file;
if (argc != 2) die ("usage: picogcnf <gcnf-file>");
if (!(file = fopen (argv[1], "r"))) die ("can not read '%s'", argv[1]);
picosat_init ();
HEADER:
ch = getc (file);
if (ch == 'c') {
while ((ch = getc (file)) != '\n')
if (ch == EOF) die ("unexpected EOF");
goto HEADER;
}
if (ch != 'p' ||
getc (file) != ' ' ||
fscanf (file, "gcnf %d %d %d", &nvars, &sclauses, &ngroups) != 3)
die ("invalid header");
nclauses = lit = 0;
group = INT_MAX;
LOG ("p gcnf %d %d %d\n", nvars, sclauses, ngroups);
LIT:
ch = getc (file);
if (ch == EOF) {
if (lit) die ("zero missing");
if (nclauses < sclauses) die ("clauses missing");
goto DONE;
}
if (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r') goto LIT;
if (lit) {
if (ch == '-') {
sign = -1;
ch = getc (file);
} else sign = 1;
lit = ch - '0';
while (isdigit (ch = getc (file)))
lit = 10 * lit + ch - '0';
if (lit > nvars) die ("maximum variable exceeded");
lit *= sign;
if (lit) {
LOG ("%d ", lit);
} else {
LOG ("0\n");
group = INT_MAX;
nclauses++;
}
picosat_add (lit);
} else if (ch == '{') {
if (nclauses == sclauses) die ("too many clauses");
if (group < INT_MAX) die ("multiple groups per clause");
GROUP:
ch = getc (file);
if (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r') goto GROUP;
if (!isdigit (ch)) die ("group does not start with digit");
group = ch - '0';
while (isdigit (ch = getc (file)))
group = 10 * group + (ch - '0');
if (group > ngroups) die ("maximal group exceeded");
while (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r')
ch = getc (file);
if (ch != '}') die ("expected '}'");
LOG ("{%d} ", group);
if (group) picosat_add (-(nvars + group));
lit = INT_MAX;
} else die ("expected '{'");
goto LIT;
DONE:
fclose (file);
for (lit = nvars + 1; lit <= nvars + ngroups; lit++) picosat_assume (lit);
res = picosat_sat (-1);
msg ("first call to SAT solver returned");
if (res == 10) printf ("s SATISFIABLE\n");
else if (res == 20) printf ("s UNSATISFIABLE\n");
else printf ("s UNKNOWN\n");
fflush (stdout);
if (res == 20) {
mus = picosat_mus_assumptions (0, callback, 1);
assert (mus);
printf ("v");
for (p = mus; (lit = *p); p++) {
assert (nvars + 1 <= lit && lit <= nvars + ngroups);
printf (" %d", lit - nvars);
}
printf (" 0\n");
fflush (stdout);
}
msg ("max memory %.1f MB",
picosat_max_bytes_allocated () / (double)(1<<20));
picosat_reset ();
msg ("%d reductions", reductions);
return res;
}
