main.c

对软件进行可达性测试的软件

			{	printf("spin: cannot open %s\n",
					*nvr_file);
				alldone(1);
			}
			tl_out = cpyfile(argv[1], out2);
			while (fgets(buf, 1024, fd))
				fprintf(tl_out, "%s", buf);
			fclose(tl_out);
			fclose(fd);
			preprocess(out2, out1, 1);
		} else
			preprocess(argv[1], out1, 0);

		if (preprocessonly)
			alldone(0);

		if (!(yyin = fopen(out1, "r")))
		{	printf("spin: cannot open %s\n", out1);
			alldone(1);
		}

		if (strncmp(argv[1], "progress", (size_t) 8) == 0
		||  strncmp(argv[1], "accept", (size_t) 6) == 0)
			sprintf(cmd, "_%s", argv[1]);
		else
			strcpy(cmd, argv[1]);
		oFname = Fname = lookup(cmd);
		if (oFname->name[0] == '\"')
		{	int i = (int) strlen(oFname->name);
			oFname->name[i-1] = '\0';
			oFname = lookup(&oFname->name[1]);
		}
	} else
	{	oFname = Fname = lookup("<stdin>");
		if (add_ltl)
		{	if (argc > 0)
				exit(tl_main(2, add_ltl));
			printf("spin: missing argument to -f\n");
			alldone(1);
		}
		printf("%s\n", SpinVersion);
		printf("reading input from stdin:\n");
		fflush(stdout);
	}
	if (columns == 2)
	{	extern void putprelude(void);
		if (xspin || verbose&(1|4|8|16|32))
		{	printf("spin: -c precludes all flags except -t\n");
			alldone(1);
		}
		putprelude();
	}
	if (columns && !(verbose&8) && !(verbose&16))
		verbose += (8+16);
	if (columns == 2 && limited_vis)
		verbose += (1+4);
	Srand((unsigned int) T);	/* defined in run.c */
	SeedUsed = T;
	s = lookup("_");	s->type = PREDEF; /* write-only global var */
	s = lookup("_p");	s->type = PREDEF;
	s = lookup("_pid");	s->type = PREDEF;
	s = lookup("_last");	s->type = PREDEF;
	s = lookup("_nr_pr");	s->type = PREDEF; /* new 3.3.10 */

	yyparse();
	fclose(yyin);
	loose_ends();

	if (inlineonly)
	{	repro_src();
		return 0;
	}

	chanaccess();
	if (!Caccess)
	{	if (!s_trail && (dataflow || merger))
			ana_src(dataflow, merger);
		sched();
		alldone(nr_errs);
	}
	return 0;
}

int
yywrap(void)	/* dummy routine */
{
	return 1;
}

void
non_fatal(char *s1, char *s2)
{	extern int yychar; extern char yytext[];

	printf("spin: line %3d %s, Error: ",
		lineno, Fname?Fname->name:"nofilename");
	if (s2)
		printf(s1, s2);
	else
		printf(s1);
	if (yychar != -1 && yychar != 0)
	{	printf("	saw '");
		explain(yychar);
		printf("'");
	}
	if (strlen(yytext)>1)
		printf(" near '%s'", yytext);
	printf("\n");
	nr_errs++;
}

void
fatal(char *s1, char *s2)
{
	non_fatal(s1, s2);
	alldone(1);
}

char *
emalloc(size_t n)
{	char *tmp;

	if (n == 0)
		return NULL;	/* robert shelton 10/20/06 */

	if (!(tmp = (char *) malloc(n)))
		fatal("not enough memory", (char *)0);
	memset(tmp, 0, n);
	return tmp;
}

void
trapwonly(Lextok *n /* , char *unused */)
{	extern int realread;
	short i = (n->sym)?n->sym->type:0;

	if (i != MTYPE
	&&  i != BIT
	&&  i != BYTE
	&&  i != SHORT
	&&  i != INT
	&&  i != UNSIGNED)
		return;

	if (realread)
	n->sym->hidden |= 128;	/* var is read at least once */
}

void
setaccess(Symbol *sp, Symbol *what, int cnt, int t)
{	Access *a;

	for (a = sp->access; a; a = a->lnk)
		if (a->who == context
		&&  a->what == what
		&&  a->cnt == cnt
		&&  a->typ == t)
			return;

	a = (Access *) emalloc(sizeof(Access));
	a->who = context;
	a->what = what;
	a->cnt = cnt;
	a->typ = t;
	a->lnk = sp->access;
	sp->access = a;
}

Lextok *
nn(Lextok *s, int t, Lextok *ll, Lextok *rl)
{	Lextok *n = (Lextok *) emalloc(sizeof(Lextok));
	static int warn_nn = 0;

	n->ntyp = (short) t;
	if (s && s->fn)
	{	n->ln = s->ln;
		n->fn = s->fn;
	} else if (rl && rl->fn)
	{	n->ln = rl->ln;
		n->fn = rl->fn;
	} else if (ll && ll->fn)
	{	n->ln = ll->ln;
		n->fn = ll->fn;
	} else
	{	n->ln = lineno;
		n->fn = Fname;
	}
	if (s) n->sym  = s->sym;
	n->lft  = ll;
	n->rgt  = rl;
	n->indstep = DstepStart;

	if (t == TIMEOUT) Etimeouts++;

	if (!context) return n;

	if (t == 'r' || t == 's')
		setaccess(n->sym, ZS, 0, t);
	if (t == 'R')
		setaccess(n->sym, ZS, 0, 'P');

	if (context->name == claimproc)
	{	int forbidden = separate;
		switch (t) {
		case ASGN:
			printf("spin: Warning, never claim has side-effect\n");
			break;
		case 'r': case 's':
			non_fatal("never claim contains i/o stmnts",(char *)0);
			break;
		case TIMEOUT:
			/* never claim polls timeout */
			if (Ntimeouts && Etimeouts)
				forbidden = 0;
			Ntimeouts++; Etimeouts--;
			break;
		case LEN: case EMPTY: case FULL:
		case 'R': case NFULL: case NEMPTY:
			/* status becomes non-exclusive */
			if (n->sym && !(n->sym->xu&XX))
			{	n->sym->xu |= XX;
				if (separate == 2) {
				printf("spin: warning, make sure that the S1 model\n");
				printf("      also polls channel '%s' in its claim\n",
				n->sym->name); 
			}	}
			forbidden = 0;
			break;
		case 'c':
			AST_track(n, 0);	/* register as a slice criterion */
			/* fall thru */
		default:
			forbidden = 0;
			break;
		}
		if (forbidden)
		{	printf("spin: never, saw "); explain(t); printf("\n");
			fatal("incompatible with separate compilation",(char *)0);
		}
	} else if ((t == ENABLED || t == PC_VAL) && !(warn_nn&t))
	{	printf("spin: Warning, using %s outside never claim\n",
			(t == ENABLED)?"enabled()":"pc_value()");
		warn_nn |= t;
	} else if (t == NONPROGRESS)
	{	fatal("spin: Error, using np_ outside never claim\n", (char *)0);
	}
	return n;
}

Lextok *
rem_lab(Symbol *a, Lextok *b, Symbol *c)	/* proctype name, pid, label name */
{	Lextok *tmp1, *tmp2, *tmp3;

	has_remote++;
	c->type = LABEL;	/* refered to in global context here */
	fix_dest(c, a);		/* in case target of rem_lab is jump */
	tmp1 = nn(ZN, '?',   b, ZN); tmp1->sym = a;
	tmp1 = nn(ZN, 'p', tmp1, ZN);
	tmp1->sym = lookup("_p");
	tmp2 = nn(ZN, NAME,  ZN, ZN); tmp2->sym = a;
	tmp3 = nn(ZN, 'q', tmp2, ZN); tmp3->sym = c;
	return nn(ZN, EQ, tmp1, tmp3);
#if 0
	      .---------------EQ-------.
	     /                          \
	   'p' -sym-> _p               'q' -sym-> c (label name)
	   /                           /
	 '?' -sym-> a (proctype)     NAME -sym-> a (proctype name)
	 / 
	b (pid expr)
#endif
}

Lextok *
rem_var(Symbol *a, Lextok *b, Symbol *c, Lextok *ndx)
{	Lextok *tmp1;

	has_remote++;
	has_remvar++;
	dataflow = 0;	/* turn off dead variable resets 4.2.5 */
	tmp1 = nn(ZN, '?', b, ZN); tmp1->sym = a;
	tmp1 = nn(ZN, 'p', tmp1, ndx);
	tmp1->sym = c;
	return tmp1;
#if 0
	cannot refer to struct elements
	only to scalars and arrays

	    'p' -sym-> c (variable name)
	    / \______  possible arrayindex on c
	   /
	 '?' -sym-> a (proctype)
	 / 
	b (pid expr)
#endif
}

static void
explain(int n)
{	FILE *fd = stdout;
	switch (n) {
	default:	if (n > 0 && n < 256)
				fprintf(fd, "'%c' = '", n);
			fprintf(fd, "%d'", n);
			break;
	case '\b':	fprintf(fd, "\\b"); break;
	case '\t':	fprintf(fd, "\\t"); break;
	case '\f':	fprintf(fd, "\\f"); break;
	case '\n':	fprintf(fd, "\\n"); break;
	case '\r':	fprintf(fd, "\\r"); break;
	case 'c':	fprintf(fd, "condition"); break;
	case 's':	fprintf(fd, "send"); break;
	case 'r':	fprintf(fd, "recv"); break;
	case 'R':	fprintf(fd, "recv poll %s", Operator); break;
	case '@':	fprintf(fd, "@"); break;
	case '?':	fprintf(fd, "(x->y:z)"); break;
	case ACTIVE:	fprintf(fd, "%sactive",	Keyword); break;
	case AND:	fprintf(fd, "%s&&",	Operator); break;
	case ASGN:	fprintf(fd, "%s=",	Operator); break;
	case ASSERT:	fprintf(fd, "%sassert",	Function); break;
	case ATOMIC:	fprintf(fd, "%satomic",	Keyword); break;
	case BREAK:	fprintf(fd, "%sbreak",	Keyword); break;
	case C_CODE:	fprintf(fd, "%sc_code",	Keyword); break;
	case C_DECL:	fprintf(fd, "%sc_decl",	Keyword); break;
	case C_EXPR:	fprintf(fd, "%sc_expr",	Keyword); break;
	case C_STATE:	fprintf(fd, "%sc_state",Keyword); break;
	case C_TRACK:	fprintf(fd, "%sc_track",Keyword); break;
	case CLAIM:	fprintf(fd, "%snever",	Keyword); break;
	case CONST:	fprintf(fd, "a constant"); break;
	case DECR:	fprintf(fd, "%s--",	Operator); break;
	case D_STEP:	fprintf(fd, "%sd_step",	Keyword); break;
	case D_PROCTYPE: fprintf(fd, "%sd_proctype", Keyword); break;
	case DO:	fprintf(fd, "%sdo",	Keyword); break;
	case DOT:	fprintf(fd, "."); break;
	case ELSE:	fprintf(fd, "%selse",	Keyword); break;
	case EMPTY:	fprintf(fd, "%sempty",	Function); break;
	case ENABLED:	fprintf(fd, "%senabled",Function); break;
	case EQ:	fprintf(fd, "%s==",	Operator); break;
	case EVAL:	fprintf(fd, "%seval",	Function); break;
	case FI:	fprintf(fd, "%sfi",	Keyword); break;
	case FULL:	fprintf(fd, "%sfull",	Function); break;
	case GE:	fprintf(fd, "%s>=",	Operator); break;
	case GOTO:	fprintf(fd, "%sgoto",	Keyword); break;
	case GT:	fprintf(fd, "%s>",	Operator); break;
	case HIDDEN:	fprintf(fd, "%shidden",	Keyword); break;
	case IF:	fprintf(fd, "%sif",	Keyword); break;
	case INCR:	fprintf(fd, "%s++",	Operator); break;
	case INAME:	fprintf(fd, "inline name"); break;
	case INLINE:	fprintf(fd, "%sinline",	Keyword); break;
	case INIT:	fprintf(fd, "%sinit",	Keyword); break;
	case ISLOCAL:	fprintf(fd, "%slocal",  Keyword); break;
	case LABEL:	fprintf(fd, "a label-name"); break;
	case LE:	fprintf(fd, "%s<=",	Operator); break;
	case LEN:	fprintf(fd, "%slen",	Function); break;
	case LSHIFT:	fprintf(fd, "%s<<",	Operator); break;
	case LT:	fprintf(fd, "%s<",	Operator); break;
	case MTYPE:	fprintf(fd, "%smtype",	Keyword); break;
	case NAME:	fprintf(fd, "an identifier"); break;
	case NE:	fprintf(fd, "%s!=",	Operator); break;
	case NEG:	fprintf(fd, "%s! (not)",Operator); break;
	case NEMPTY:	fprintf(fd, "%snempty",	Function); break;
	case NFULL:	fprintf(fd, "%snfull",	Function); break;
	case NON_ATOMIC: fprintf(fd, "sub-sequence"); break;
	case NONPROGRESS: fprintf(fd, "%snp_",	Function); break;
	case OD:	fprintf(fd, "%sod",	Keyword); break;
	case OF:	fprintf(fd, "%sof",	Keyword); break;
	case OR:	fprintf(fd, "%s||",	Operator); break;
	case O_SND:	fprintf(fd, "%s!!",	Operator); break;
	case PC_VAL:	fprintf(fd, "%spc_value",Function); break;
	case PNAME:	fprintf(fd, "process name"); break;
	case PRINT:	fprintf(fd, "%sprintf",	Function); break;
	case PRINTM:	fprintf(fd, "%sprintm",	Function); break;
	case PRIORITY:	fprintf(fd, "%spriority", Keyword); break;
	case PROCTYPE:	fprintf(fd, "%sproctype",Keyword); break;
	case PROVIDED:	fprintf(fd, "%sprovided",Keyword); break;
	case RCV:	fprintf(fd, "%s?",	Operator); break;
	case R_RCV:	fprintf(fd, "%s??",	Operator); break;
	case RSHIFT:	fprintf(fd, "%s>>",	Operator); break;
	case RUN:	fprintf(fd, "%srun",	Operator); break;
	case SEP:	fprintf(fd, "token: ::"); break;
	case SEMI:	fprintf(fd, ";"); break;
	case SHOW:	fprintf(fd, "%sshow", Keyword); break;
	case SND:	fprintf(fd, "%s!",	Operator); break;
	case STRING:	fprintf(fd, "a string"); break;
	case TRACE:	fprintf(fd, "%strace", Keyword); break;
	case TIMEOUT:	fprintf(fd, "%stimeout",Keyword); break;
	case TYPE:	fprintf(fd, "data typename"); break;
	case TYPEDEF:	fprintf(fd, "%stypedef",Keyword); break;
	case XU:	fprintf(fd, "%sx[rs]",	Keyword); break;
	case UMIN:	fprintf(fd, "%s- (unary minus)", Operator); break;
	case UNAME:	fprintf(fd, "a typename"); break;
	case UNLESS:	fprintf(fd, "%sunless",	Keyword); break;
	}
}