ref: c3867623ae93eca77ba6e4f3d851240442f02caf
dir: /sys/src/cmd/spin/guided.c/
/***** spin: guided.c *****/
/* Copyright (c) 1989-2003 by Lucent Technologies, Bell Laboratories. */
/* All Rights Reserved. This software is for educational purposes only. */
/* No guarantee whatsoever is expressed or implied by the distribution of */
/* this code. Permission is given to distribute this code provided that */
/* this introductory message is not removed and no monies are exchanged. */
/* Software written by Gerard J. Holzmann. For tool documentation see: */
/* http://spinroot.com/ */
/* Send all bug-reports and/or questions to: [email protected] */
#include "spin.h"
#include <sys/types.h>
#include <sys/stat.h>
#include "y.tab.h"
extern RunList *run, *X;
extern Element *Al_El;
extern Symbol *Fname, *oFname;
extern int verbose, lineno, xspin, jumpsteps, depth, merger, cutoff;
extern int nproc, nstop, Tval, ntrail, columns;
extern short Have_claim, Skip_claim;
extern void ana_src(int, int);
int TstOnly = 0, pno;
static int lastclaim = -1;
static FILE *fd;
static void lost_trail(void);
static void
whichproc(int p)
{ RunList *oX;
for (oX = run; oX; oX = oX->nxt)
if (oX->pid == p)
{ printf("(%s) ", oX->n->name);
break;
}
}
static int
newer(char *f1, char *f2)
{
#if defined(WIN32) || defined(WIN64)
struct _stat x, y;
#else
struct stat x, y;
#endif
if (stat(f1, (struct stat *)&x) < 0) return 0;
if (stat(f2, (struct stat *)&y) < 0) return 1;
if (x.st_mtime < y.st_mtime) return 0;
return 1;
}
void
hookup(void)
{ Element *e;
for (e = Al_El; e; e = e->Nxt)
if (e->n
&& (e->n->ntyp == ATOMIC
|| e->n->ntyp == NON_ATOMIC
|| e->n->ntyp == D_STEP))
(void) huntstart(e);
}
int
not_claim(void)
{
return (!Have_claim || !X || X->pid != 0);
}
void
match_trail(void)
{ int i, a, nst;
Element *dothis;
char snap[512], *q;
/*
* if source model name is leader.pml
* look for the trail file under these names:
* leader.pml.trail
* leader.pml.tra
* leader.trail
* leader.tra
*/
if (ntrail)
sprintf(snap, "%s%d.trail", oFname->name, ntrail);
else
sprintf(snap, "%s.trail", oFname->name);
if ((fd = fopen(snap, "r")) == NULL)
{ snap[strlen(snap)-2] = '\0'; /* .tra */
if ((fd = fopen(snap, "r")) == NULL)
{ if ((q = strchr(oFname->name, '.')) != NULL)
{ *q = '\0';
if (ntrail)
sprintf(snap, "%s%d.trail",
oFname->name, ntrail);
else
sprintf(snap, "%s.trail",
oFname->name);
*q = '.';
if ((fd = fopen(snap, "r")) != NULL)
goto okay;
snap[strlen(snap)-2] = '\0'; /* last try */
if ((fd = fopen(snap, "r")) != NULL)
goto okay;
}
printf("spin: cannot find trail file\n");
alldone(1);
} }
okay:
if (xspin == 0 && newer(oFname->name, snap))
printf("spin: warning, \"%s\" is newer than %s\n",
oFname->name, snap);
Tval = 1;
/*
* sets Tval because timeouts may be part of trail
* this used to also set m_loss to 1, but that is
* better handled with the runtime -m flag
*/
hookup();
while (fscanf(fd, "%d:%d:%d\n", &depth, &pno, &nst) == 3)
{ if (depth == -2) { start_claim(pno); continue; }
if (depth == -4) { merger = 1; ana_src(0, 1); continue; }
if (depth == -1)
{ if (verbose)
{ if (columns == 2)
dotag(stdout, " CYCLE>\n");
else
dotag(stdout, "<<<<<START OF CYCLE>>>>>\n");
}
continue;
}
if (cutoff > 0 && depth >= cutoff)
{ printf("-------------\n");
printf("depth-limit (-u%d steps) reached\n", cutoff);
break;
}
if (Skip_claim && pno == 0) continue;
for (dothis = Al_El; dothis; dothis = dothis->Nxt)
{ if (dothis->Seqno == nst)
break;
}
if (!dothis)
{ printf("%3d: proc %d, no matching stmnt %d\n",
depth, pno - Have_claim, nst);
lost_trail();
}
i = nproc - nstop + Skip_claim;
if (dothis->n->ntyp == '@')
{ if (pno == i-1)
{ run = run->nxt;
nstop++;
if (verbose&4)
{ if (columns == 2)
{ dotag(stdout, "<end>\n");
continue;
}
if (Have_claim && pno == 0)
printf("%3d: claim terminates\n",
depth);
else
printf("%3d: proc %d terminates\n",
depth, pno - Have_claim);
}
continue;
}
if (pno <= 1) continue; /* init dies before never */
printf("%3d: stop error, ", depth);
printf("proc %d (i=%d) trans %d, %c\n",
pno - Have_claim, i, nst, dothis->n->ntyp);
lost_trail();
}
for (X = run; X; X = X->nxt)
{ if (--i == pno)
break;
}
if (!X)
{ printf("%3d: no process %d ", depth, pno - Have_claim);
printf("(state %d)\n", nst);
lost_trail();
}
X->pc = dothis;
lineno = dothis->n->ln;
Fname = dothis->n->fn;
if (dothis->n->ntyp == D_STEP)
{ Element *g, *og = dothis;
do {
g = eval_sub(og);
if (g && depth >= jumpsteps
&& ((verbose&32) || ((verbose&4) && not_claim())))
{ if (columns != 2)
{ p_talk(og, 1);
if (og->n->ntyp == D_STEP)
og = og->n->sl->this->frst;
printf("\t[");
comment(stdout, og->n, 0);
printf("]\n");
}
if (verbose&1) dumpglobals();
if (verbose&2) dumplocal(X);
if (xspin) printf("\n");
}
og = g;
} while (g && g != dothis->nxt);
if (X != NULL)
{ X->pc = g?huntele(g, 0, -1):g;
}
} else
{
keepgoing: if (dothis->merge_start)
a = dothis->merge_start;
else
a = dothis->merge;
if (X != NULL)
{ X->pc = eval_sub(dothis);
if (X->pc) X->pc = huntele(X->pc, 0, a);
}
if (depth >= jumpsteps
&& ((verbose&32) || ((verbose&4) && not_claim()))) /* -v or -p */
{ if (columns != 2)
{ p_talk(dothis, 1);
if (dothis->n->ntyp == D_STEP)
dothis = dothis->n->sl->this->frst;
printf("\t[");
comment(stdout, dothis->n, 0);
printf("]");
if (a && (verbose&32))
printf("\t<merge %d now @%d>",
dothis->merge,
(X && X->pc)?X->pc->seqno:-1);
printf("\n");
}
if (verbose&1) dumpglobals();
if (verbose&2) dumplocal(X);
if (xspin) printf("\n");
if (X && !X->pc)
{ X->pc = dothis;
printf("\ttransition failed\n");
a = 0; /* avoid inf loop */
}
}
if (a && X && X->pc && X->pc->seqno != a)
{ dothis = X->pc;
goto keepgoing;
} }
if (Have_claim && X && X->pid == 0
&& dothis && dothis->n
&& lastclaim != dothis->n->ln)
{ lastclaim = dothis->n->ln;
if (columns == 2)
{ char t[128];
sprintf(t, "#%d", lastclaim);
pstext(0, t);
} else
{
printf("Never claim moves to line %d\t[", lastclaim);
comment(stdout, dothis->n, 0);
printf("]\n");
} } }
printf("spin: trail ends after %d steps\n", depth);
wrapup(0);
}
static void
lost_trail(void)
{ int d, p, n, l;
while (fscanf(fd, "%d:%d:%d:%d\n", &d, &p, &n, &l) == 4)
{ printf("step %d: proc %d ", d, p); whichproc(p);
printf("(state %d) - d %d\n", n, l);
}
wrapup(1); /* no return */
}
int
pc_value(Lextok *n)
{ int i = nproc - nstop;
int pid = eval(n);
RunList *Y;
for (Y = run; Y; Y = Y->nxt)
{ if (--i == pid)
return Y->pc->seqno;
}
return 0;
}