ref: a8d00e5d56b261376410c3c87c46327362763bd8
dir: /sys/src/cmd/spin/vars.c/
/***** spin: vars.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 "y.tab.h"
extern Ordered *all_names;
extern RunList *X, *LastX;
extern Symbol *Fname;
extern char Buf[];
extern int lineno, depth, verbose, xspin, limited_vis;
extern int analyze, jumpsteps, nproc, nstop, columns;
extern short no_arrays, Have_claim;
extern void sr_mesg(FILE *, int, int);
extern void sr_buf(int, int);
static int getglobal(Lextok *);
static int setglobal(Lextok *, int);
static int maxcolnr = 1;
int
getval(Lextok *sn)
{ Symbol *s = sn->sym;
if (strcmp(s->name, "_") == 0)
{ non_fatal("attempt to read value of '_'", 0);
return 0;
}
if (strcmp(s->name, "_last") == 0)
return (LastX)?LastX->pid:0;
if (strcmp(s->name, "_p") == 0)
return (X && X->pc)?X->pc->seqno:0;
if (strcmp(s->name, "_pid") == 0)
{ if (!X) return 0;
return X->pid - Have_claim;
}
if (strcmp(s->name, "_nr_pr") == 0)
return nproc-nstop; /* new 3.3.10 */
if (s->context && s->type)
return getlocal(sn);
if (!s->type) /* not declared locally */
{ s = lookup(s->name); /* try global */
sn->sym = s; /* fix it */
}
return getglobal(sn);
}
int
setval(Lextok *v, int n)
{
if (v->sym->context && v->sym->type)
return setlocal(v, n);
if (!v->sym->type)
v->sym = lookup(v->sym->name);
return setglobal(v, n);
}
void
rm_selfrefs(Symbol *s, Lextok *i)
{
if (!i) return;
if (i->ntyp == NAME
&& strcmp(i->sym->name, s->name) == 0
&& ( (!i->sym->context && !s->context)
|| ( i->sym->context && s->context
&& strcmp(i->sym->context->name, s->context->name) == 0)))
{ lineno = i->ln;
Fname = i->fn;
non_fatal("self-reference initializing '%s'", s->name);
i->ntyp = CONST;
i->val = 0;
} else
{ rm_selfrefs(s, i->lft);
rm_selfrefs(s, i->rgt);
}
}
int
checkvar(Symbol *s, int n)
{ int i, oln = lineno; /* calls on eval() change it */
Symbol *ofnm = Fname;
if (!in_bound(s, n))
return 0;
if (s->type == 0)
{ non_fatal("undecl var %s (assuming int)", s->name);
s->type = INT;
}
/* not a STRUCT */
if (s->val == (int *) 0) /* uninitialized */
{ s->val = (int *) emalloc(s->nel*sizeof(int));
for (i = 0; i < s->nel; i++)
{ if (s->type != CHAN)
{ rm_selfrefs(s, s->ini);
s->val[i] = eval(s->ini);
} else if (!analyze)
s->val[i] = qmake(s);
} }
lineno = oln;
Fname = ofnm;
return 1;
}
static int
getglobal(Lextok *sn)
{ Symbol *s = sn->sym;
int i, n = eval(sn->lft);
if (s->type == 0 && X && (i = find_lab(s, X->n, 0)))
{ printf("findlab through getglobal on %s\n", s->name);
return i; /* can this happen? */
}
if (s->type == STRUCT)
return Rval_struct(sn, s, 1); /* 1 = check init */
if (checkvar(s, n))
return cast_val(s->type, s->val[n], s->nbits);
return 0;
}
int
cast_val(int t, int v, int w)
{ int i=0; short s=0; unsigned int u=0;
if (t == PREDEF || t == INT || t == CHAN) i = v; /* predef means _ */
else if (t == SHORT) s = (short) v;
else if (t == BYTE || t == MTYPE) u = (unsigned char)v;
else if (t == BIT) u = (unsigned char)(v&1);
else if (t == UNSIGNED)
{ if (w == 0)
fatal("cannot happen, cast_val", (char *)0);
/* u = (unsigned)(v& ((1<<w)-1)); problem when w=32 */
u = (unsigned)(v& (~0u>>(8*sizeof(unsigned)-w))); /* doug */
}
if (v != i+s+ (int) u)
{ char buf[32]; sprintf(buf, "%d->%d (%d)", v, i+s+u, t);
non_fatal("value (%s) truncated in assignment", buf);
}
return (int)(i+s+u);
}
static int
setglobal(Lextok *v, int m)
{
if (v->sym->type == STRUCT)
(void) Lval_struct(v, v->sym, 1, m);
else
{ int n = eval(v->lft);
if (checkvar(v->sym, n))
{ v->sym->val[n] = cast_val(v->sym->type, m, v->sym->nbits);
v->sym->setat = depth;
} }
return 1;
}
void
dumpclaims(FILE *fd, int pid, char *s)
{ extern Lextok *Xu_List; extern int Pid;
extern short terse;
Lextok *m; int cnt = 0; int oPid = Pid;
for (m = Xu_List; m; m = m->rgt)
if (strcmp(m->sym->name, s) == 0)
{ cnt=1;
break;
}
if (cnt == 0) return;
Pid = pid;
fprintf(fd, "#ifndef XUSAFE\n");
for (m = Xu_List; m; m = m->rgt)
{ if (strcmp(m->sym->name, s) != 0)
continue;
no_arrays = 1;
putname(fd, "\t\tsetq_claim(", m->lft, 0, "");
no_arrays = 0;
fprintf(fd, ", %d, ", m->val);
terse = 1;
putname(fd, "\"", m->lft, 0, "\", h, ");
terse = 0;
fprintf(fd, "\"%s\");\n", s);
}
fprintf(fd, "#endif\n");
Pid = oPid;
}
void
dumpglobals(void)
{ Ordered *walk;
static Lextok *dummy = ZN;
Symbol *sp;
int j;
if (!dummy)
dummy = nn(ZN, NAME, nn(ZN,CONST,ZN,ZN), ZN);
for (walk = all_names; walk; walk = walk->next)
{ sp = walk->entry;
if (!sp->type || sp->context || sp->owner
|| sp->type == PROCTYPE || sp->type == PREDEF
|| sp->type == CODE_FRAG || sp->type == CODE_DECL
|| (sp->type == MTYPE && ismtype(sp->name)))
continue;
if (sp->type == STRUCT)
{ dump_struct(sp, sp->name, 0);
continue;
}
for (j = 0; j < sp->nel; j++)
{ int prefetch;
if (sp->type == CHAN)
{ doq(sp, j, 0);
continue;
}
if ((verbose&4) && !(verbose&64)
&& (sp->setat < depth
&& jumpsteps != depth))
continue;
dummy->sym = sp;
dummy->lft->val = j;
/* in case of cast_val warnings, do this first: */
prefetch = getglobal(dummy);
printf("\t\t%s", sp->name);
if (sp->nel > 1) printf("[%d]", j);
printf(" = ");
sr_mesg(stdout, prefetch,
sp->type == MTYPE);
printf("\n");
if (limited_vis && (sp->hidden&2))
{ int colpos;
Buf[0] = '\0';
if (!xspin)
{ if (columns == 2)
sprintf(Buf, "~G%s = ", sp->name);
else
sprintf(Buf, "%s = ", sp->name);
}
sr_buf(prefetch, sp->type == MTYPE);
if (sp->colnr == 0)
{ sp->colnr = maxcolnr;
maxcolnr = 1+(maxcolnr%10);
}
colpos = nproc+sp->colnr-1;
if (columns == 2)
{ pstext(colpos, Buf);
continue;
}
if (!xspin)
{ printf("\t\t%s\n", Buf);
continue;
}
printf("MSC: ~G %s %s\n", sp->name, Buf);
printf("%3d:\tproc %3d (TRACK) line 1 \"var\" ",
depth, colpos);
printf("(state 0)\t[printf('MSC: globvar\\\\n')]\n");
printf("\t\t%s", sp->name);
if (sp->nel > 1) printf("[%d]", j);
printf(" = %s\n", Buf);
} } }
}
void
dumplocal(RunList *r)
{ static Lextok *dummy = ZN;
Symbol *z, *s;
int i;
if (!r) return;
s = r->symtab;
if (!dummy)
dummy = nn(ZN, NAME, nn(ZN,CONST,ZN,ZN), ZN);
for (z = s; z; z = z->next)
{ if (z->type == STRUCT)
{ dump_struct(z, z->name, r);
continue;
}
for (i = 0; i < z->nel; i++)
{ if (z->type == CHAN)
{ doq(z, i, r);
continue;
}
if ((verbose&4) && !(verbose&64)
&& (z->setat < depth
&& jumpsteps != depth))
continue;
dummy->sym = z;
dummy->lft->val = i;
printf("\t\t%s(%d):%s",
r->n->name, r->pid, z->name);
if (z->nel > 1) printf("[%d]", i);
printf(" = ");
sr_mesg(stdout, getval(dummy), z->type == MTYPE);
printf("\n");
if (limited_vis && (z->hidden&2))
{ int colpos;
Buf[0] = '\0';
if (!xspin)
{ if (columns == 2)
sprintf(Buf, "~G%s(%d):%s = ",
r->n->name, r->pid, z->name);
else
sprintf(Buf, "%s(%d):%s = ",
r->n->name, r->pid, z->name);
}
sr_buf(getval(dummy), z->type==MTYPE);
if (z->colnr == 0)
{ z->colnr = maxcolnr;
maxcolnr = 1+(maxcolnr%10);
}
colpos = nproc+z->colnr-1;
if (columns == 2)
{ pstext(colpos, Buf);
continue;
}
if (!xspin)
{ printf("\t\t%s\n", Buf);
continue;
}
printf("MSC: ~G %s(%d):%s %s\n",
r->n->name, r->pid, z->name, Buf);
printf("%3d:\tproc %3d (TRACK) line 1 \"var\" ",
depth, colpos);
printf("(state 0)\t[printf('MSC: locvar\\\\n')]\n");
printf("\t\t%s(%d):%s",
r->n->name, r->pid, z->name);
if (z->nel > 1) printf("[%d]", i);
printf(" = %s\n", Buf);
} } }
}