+++ /dev/null
-/***** spin: sym.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: bugs@spinroot.com */
-
-#include "spin.h"
-#include "y.tab.h"
-
-extern Symbol *Fname, *owner;
-extern int lineno, depth, verbose, NamesNotAdded, deadvar, has_hidden;
-extern short has_xu;
-
-Symbol *context = ZS;
-Ordered *all_names = (Ordered *)0;
-int Nid = 0;
-
-Lextok *Mtype = (Lextok *) 0;
-
-static Ordered *last_name = (Ordered *)0;
-static Symbol *symtab[Nhash+1];
-static Lextok *runstmnts = ZN;
-
-static int
-samename(Symbol *a, Symbol *b)
-{
- if (!a && !b) return 1;
- if (!a || !b) return 0;
- return !strcmp(a->name, b->name);
-}
-
-int
-hash(char *s)
-{ int h=0;
-
- while (*s)
- { h += *s++;
- h <<= 1;
- if (h&(Nhash+1))
- h |= 1;
- }
- return h&Nhash;
-}
-
-Symbol *
-lookup(char *s)
-{ Symbol *sp; Ordered *no;
- int h = hash(s);
-
- for (sp = symtab[h]; sp; sp = sp->next)
- if (strcmp(sp->name, s) == 0
- && samename(sp->context, context)
- && samename(sp->owner, owner))
- return sp; /* found */
-
- if (context) /* in proctype */
- for (sp = symtab[h]; sp; sp = sp->next)
- if (strcmp(sp->name, s) == 0
- && !sp->context
- && samename(sp->owner, owner))
- return sp; /* global */
-
- sp = (Symbol *) emalloc(sizeof(Symbol));
- sp->name = (char *) emalloc(strlen(s) + 1);
- strcpy(sp->name, s);
- sp->nel = 1;
- sp->setat = depth;
- sp->context = context;
- sp->owner = owner; /* if fld in struct */
-
- if (NamesNotAdded == 0)
- { sp->next = symtab[h];
- symtab[h] = sp;
- no = (Ordered *) emalloc(sizeof(Ordered));
- no->entry = sp;
- if (!last_name)
- last_name = all_names = no;
- else
- { last_name->next = no;
- last_name = no;
- } }
-
- return sp;
-}
-
-void
-trackvar(Lextok *n, Lextok *m)
-{ Symbol *sp = n->sym;
-
- if (!sp) return; /* a structure list */
- switch (m->ntyp) {
- case NAME:
- if (m->sym->type != BIT)
- { sp->hidden |= 4;
- if (m->sym->type != BYTE)
- sp->hidden |= 8;
- }
- break;
- case CONST:
- if (m->val != 0 && m->val != 1)
- sp->hidden |= 4;
- if (m->val < 0 || m->val > 256)
- sp->hidden |= 8; /* ditto byte-equiv */
- break;
- default: /* unknown */
- sp->hidden |= (4|8); /* not known bit-equiv */
- }
-}
-
-void
-trackrun(Lextok *n)
-{
- runstmnts = nn(ZN, 0, n, runstmnts);
-}
-
-void
-checkrun(Symbol *parnm, int posno)
-{ Lextok *n, *now, *v; int i, m;
- int res = 0; char buf[16], buf2[16];
-
- for (n = runstmnts; n; n = n->rgt)
- { now = n->lft;
- if (now->sym != parnm->context)
- continue;
- for (v = now->lft, i = 0; v; v = v->rgt, i++)
- if (i == posno)
- { m = v->lft->ntyp;
- if (m == CONST)
- { m = v->lft->val;
- if (m != 0 && m != 1)
- res |= 4;
- if (m < 0 || m > 256)
- res |= 8;
- } else if (m == NAME)
- { m = v->lft->sym->type;
- if (m != BIT)
- { res |= 4;
- if (m != BYTE)
- res |= 8;
- }
- } else
- res |= (4|8); /* unknown */
- break;
- } }
- if (!(res&4) || !(res&8))
- { if (!(verbose&32)) return;
- strcpy(buf2, (!(res&4))?"bit":"byte");
- sputtype(buf, parnm->type);
- i = (int) strlen(buf);
- while (i > 0 && buf[--i] == ' ') buf[i] = '\0';
- if (i == 0 || strcmp(buf, buf2) == 0) return;
- prehint(parnm);
- printf("proctype %s, '%s %s' could be declared",
- parnm->context?parnm->context->name:"", buf, parnm->name);
- printf(" '%s %s'\n", buf2, parnm->name);
- }
-}
-
-void
-trackchanuse(Lextok *m, Lextok *w, int t)
-{ Lextok *n = m; int cnt = 1;
- while (n)
- { if (n->lft
- && n->lft->sym
- && n->lft->sym->type == CHAN)
- setaccess(n->lft->sym, w?w->sym:ZS, cnt, t);
- n = n->rgt; cnt++;
- }
-}
-
-void
-setptype(Lextok *n, int t, Lextok *vis) /* predefined types */
-{ int oln = lineno, cnt = 1; extern int Expand_Ok;
-
- while (n)
- { if (n->sym->type && !(n->sym->hidden&32))
- { lineno = n->ln; Fname = n->fn;
- non_fatal("redeclaration of '%s'", n->sym->name);
- lineno = oln;
- }
- n->sym->type = (short) t;
-
- if (Expand_Ok)
- { n->sym->hidden |= (4|8|16); /* formal par */
- if (t == CHAN)
- setaccess(n->sym, ZS, cnt, 'F');
- }
- if (t == UNSIGNED)
- { if (n->sym->nbits < 0 || n->sym->nbits >= 32)
- fatal("(%s) has invalid width-field", n->sym->name);
- if (n->sym->nbits == 0)
- { n->sym->nbits = 16;
- non_fatal("unsigned without width-field", 0);
- }
- } else if (n->sym->nbits > 0)
- { non_fatal("(%s) only an unsigned can have width-field",
- n->sym->name);
- }
- if (vis)
- { if (strncmp(vis->sym->name, ":hide:", (size_t) 6) == 0)
- { n->sym->hidden |= 1;
- has_hidden++;
- if (t == BIT)
- fatal("bit variable (%s) cannot be hidden",
- n->sym->name);
- } else if (strncmp(vis->sym->name, ":show:", (size_t) 6) == 0)
- { n->sym->hidden |= 2;
- } else if (strncmp(vis->sym->name, ":local:", (size_t) 7) == 0)
- { n->sym->hidden |= 64;
- }
- }
- if (t == CHAN)
- n->sym->Nid = ++Nid;
- else
- { n->sym->Nid = 0;
- if (n->sym->ini
- && n->sym->ini->ntyp == CHAN)
- { Fname = n->fn;
- lineno = n->ln;
- fatal("chan initializer for non-channel %s",
- n->sym->name);
- }
- }
- if (n->sym->nel <= 0)
- { lineno = n->ln; Fname = n->fn;
- non_fatal("bad array size for '%s'", n->sym->name);
- lineno = oln;
- }
- n = n->rgt; cnt++;
- }
-}
-
-static void
-setonexu(Symbol *sp, int t)
-{
- sp->xu |= t;
- if (t == XR || t == XS)
- { if (sp->xup[t-1]
- && strcmp(sp->xup[t-1]->name, context->name))
- { printf("error: x[rs] claims from %s and %s\n",
- sp->xup[t-1]->name, context->name);
- non_fatal("conflicting claims on chan '%s'",
- sp->name);
- }
- sp->xup[t-1] = context;
- }
-}
-
-static void
-setallxu(Lextok *n, int t)
-{ Lextok *fp, *tl;
-
- for (fp = n; fp; fp = fp->rgt)
- for (tl = fp->lft; tl; tl = tl->rgt)
- { if (tl->sym->type == STRUCT)
- setallxu(tl->sym->Slst, t);
- else if (tl->sym->type == CHAN)
- setonexu(tl->sym, t);
- }
-}
-
-Lextok *Xu_List = (Lextok *) 0;
-
-void
-setxus(Lextok *p, int t)
-{ Lextok *m, *n;
-
- has_xu = 1;
- if (!context)
- { lineno = p->ln;
- Fname = p->fn;
- fatal("non-local x[rs] assertion", (char *)0);
- }
- for (m = p; m; m = m->rgt)
- { Lextok *Xu_new = (Lextok *) emalloc(sizeof(Lextok));
- Xu_new->val = t;
- Xu_new->lft = m->lft;
- Xu_new->sym = context;
- Xu_new->rgt = Xu_List;
- Xu_List = Xu_new;
-
- n = m->lft;
- if (n->sym->type == STRUCT)
- setallxu(n->sym->Slst, t);
- else if (n->sym->type == CHAN)
- setonexu(n->sym, t);
- else
- { int oln = lineno;
- lineno = n->ln; Fname = n->fn;
- non_fatal("xr or xs of non-chan '%s'",
- n->sym->name);
- lineno = oln;
- }
- }
-}
-
-void
-setmtype(Lextok *m)
-{ Lextok *n;
- int cnt, oln = lineno;
-
- if (m) { lineno = m->ln; Fname = m->fn; }
-
- if (!Mtype)
- Mtype = m;
- else
- { for (n = Mtype; n->rgt; n = n->rgt)
- ;
- n->rgt = m; /* concatenate */
- }
-
- for (n = Mtype, cnt = 1; n; n = n->rgt, cnt++) /* syntax check */
- { if (!n->lft || !n->lft->sym
- || n->lft->ntyp != NAME
- || n->lft->lft) /* indexed variable */
- fatal("bad mtype definition", (char *)0);
-
- /* label the name */
- if (n->lft->sym->type != MTYPE)
- { n->lft->sym->hidden |= 128; /* is used */
- n->lft->sym->type = MTYPE;
- n->lft->sym->ini = nn(ZN,CONST,ZN,ZN);
- n->lft->sym->ini->val = cnt;
- } else if (n->lft->sym->ini->val != cnt)
- non_fatal("name %s appears twice in mtype declaration",
- n->lft->sym->name);
- }
- lineno = oln;
- if (cnt > 256)
- fatal("too many mtype elements (>255)", (char *)0);
-}
-
-int
-ismtype(char *str) /* name to number */
-{ Lextok *n;
- int cnt = 1;
-
- for (n = Mtype; n; n = n->rgt)
- { if (strcmp(str, n->lft->sym->name) == 0)
- return cnt;
- cnt++;
- }
- return 0;
-}
-
-int
-sputtype(char *foo, int m)
-{
- switch (m) {
- case UNSIGNED: strcpy(foo, "unsigned "); break;
- case BIT: strcpy(foo, "bit "); break;
- case BYTE: strcpy(foo, "byte "); break;
- case CHAN: strcpy(foo, "chan "); break;
- case SHORT: strcpy(foo, "short "); break;
- case INT: strcpy(foo, "int "); break;
- case MTYPE: strcpy(foo, "mtype "); break;
- case STRUCT: strcpy(foo, "struct"); break;
- case PROCTYPE: strcpy(foo, "proctype"); break;
- case LABEL: strcpy(foo, "label "); return 0;
- default: strcpy(foo, "value "); return 0;
- }
- return 1;
-}
-
-
-static int
-puttype(int m)
-{ char buf[128];
-
- if (sputtype(buf, m))
- { printf("%s", buf);
- return 1;
- }
- return 0;
-}
-
-void
-symvar(Symbol *sp)
-{ Lextok *m;
-
- if (!puttype(sp->type))
- return;
-
- printf("\t");
- if (sp->owner) printf("%s.", sp->owner->name);
- printf("%s", sp->name);
- if (sp->nel > 1) printf("[%d]", sp->nel);
-
- if (sp->type == CHAN)
- printf("\t%d", (sp->ini)?sp->ini->val:0);
- else if (sp->type == STRUCT) /* Frank Weil, 2.9.8 */
- printf("\t%s", sp->Snm->name);
- else
- printf("\t%d", eval(sp->ini));
-
- if (sp->owner)
- printf("\t<:struct-field:>");
- else
- if (!sp->context)
- printf("\t<:global:>");
- else
- printf("\t<%s>", sp->context->name);
-
- if (sp->Nid < 0) /* formal parameter */
- printf("\t<parameter %d>", -(sp->Nid));
- else
- printf("\t<variable>");
- if (sp->type == CHAN && sp->ini)
- { int i;
- for (m = sp->ini->rgt, i = 0; m; m = m->rgt)
- i++;
- printf("\t%d\t", i);
- for (m = sp->ini->rgt; m; m = m->rgt)
- { if (m->ntyp == STRUCT)
- printf("struct %s", m->sym->name);
- else
- (void) puttype(m->ntyp);
- if (m->rgt) printf("\t");
- }
- }
- printf("\n");
-}
-
-void
-symdump(void)
-{ Ordered *walk;
-
- for (walk = all_names; walk; walk = walk->next)
- symvar(walk->entry);
-}
-
-void
-chname(Symbol *sp)
-{ printf("chan ");
- if (sp->context) printf("%s-", sp->context->name);
- if (sp->owner) printf("%s.", sp->owner->name);
- printf("%s", sp->name);
- if (sp->nel > 1) printf("[%d]", sp->nel);
- printf("\t");
-}
-
-static struct X {
- int typ; char *nm;
-} xx[] = {
- { 'A', "exported as run parameter" },
- { 'F', "imported as proctype parameter" },
- { 'L', "used as l-value in asgnmnt" },
- { 'V', "used as r-value in asgnmnt" },
- { 'P', "polled in receive stmnt" },
- { 'R', "used as parameter in receive stmnt" },
- { 'S', "used as parameter in send stmnt" },
- { 'r', "received from" },
- { 's', "sent to" },
-};
-
-static void
-chan_check(Symbol *sp)
-{ Access *a; int i, b=0, d;
-
- if (verbose&1) goto report; /* -C -g */
-
- for (a = sp->access; a; a = a->lnk)
- if (a->typ == 'r')
- b |= 1;
- else if (a->typ == 's')
- b |= 2;
- if (b == 3 || (sp->hidden&16)) /* balanced or formal par */
- return;
-report:
- chname(sp);
- for (i = d = 0; i < (int) (sizeof(xx)/sizeof(struct X)); i++)
- { b = 0;
- for (a = sp->access; a; a = a->lnk)
- if (a->typ == xx[i].typ) b++;
- if (b == 0) continue; d++;
- printf("\n\t%s by: ", xx[i].nm);
- for (a = sp->access; a; a = a->lnk)
- if (a->typ == xx[i].typ)
- { printf("%s", a->who->name);
- if (a->what) printf(" to %s", a->what->name);
- if (a->cnt) printf(" par %d", a->cnt);
- if (--b > 0) printf(", ");
- }
- }
- printf("%s\n", (!d)?"\n\tnever used under this name":"");
-}
-
-void
-chanaccess(void)
-{ Ordered *walk;
- char buf[128];
- extern int Caccess, separate;
- extern short has_code;
-
- for (walk = all_names; walk; walk = walk->next)
- { if (!walk->entry->owner)
- switch (walk->entry->type) {
- case CHAN:
- if (Caccess) chan_check(walk->entry);
- break;
- case MTYPE:
- case BIT:
- case BYTE:
- case SHORT:
- case INT:
- case UNSIGNED:
- if ((walk->entry->hidden&128)) /* was: 32 */
- continue;
-
- if (!separate
- && !walk->entry->context
- && !has_code
- && deadvar)
- walk->entry->hidden |= 1; /* auto-hide */
-
- if (!(verbose&32) || has_code) continue;
-
- printf("spin: warning, %s, ", Fname->name);
- sputtype(buf, walk->entry->type);
- if (walk->entry->context)
- printf("proctype %s",
- walk->entry->context->name);
- else
- printf("global");
- printf(", '%s%s' variable is never used\n",
- buf, walk->entry->name);
- } }
-}
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