scc

rules.c (9625B)

---

 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "make.h"
 
 #define TABSIZ 128
 #define FORCE   1
 #define NOFORCE 0
 
 static Target *htab[TABSIZ], *deftarget;
 
 void
 dumprules(void)
 {
 	int i;
 	Target **pp, **q, *p;
 
 	for (pp = htab; pp < &htab[TABSIZ]; ++pp) {
 		for (p = *pp; p; p = p->next) {
 			if (!p->defined)
 				continue;
 			printf("%s:", p->name);
 			for (q = p->deps; q && *q; ++q)
 				printf(" %s", (*q)->name);
 			putchar('\n');
 			for (i = 0; i < p->nactions; i++)
 				printf("\t%s\n", p->actions[i].line);
 			putchar('\n');
 		}
 	}
 }
 
 static Target *
 lookup(char *name)
 {
 	Target *tp;
 	int h = hash(name) & TABSIZ-1;
 
 	for (tp = htab[h]; tp && strcmp(tp->name, name); tp = tp->next)
 		;
 
 	if (tp)
 		return tp;
 
 	tp = emalloc(sizeof(*tp));
 	tp->name = estrdup(name);
 	tp->target = tp->name;
 	tp->req = NULL;
 	tp->ndeps = 0;
 	tp->deps = NULL;
 	tp->actions = NULL;
 	tp->nactions = 0;
 	tp->next = htab[h];
 	tp->defined = 0;
 	htab[h] = tp;
 
 	return tp;
 }
 
 static void
 cleanup(Target *tp)
 {
 	int sig, precious;
 	Target *p, **q;
 
 	sig = stop;
 	printf("make: signal %d arrived\n", sig);
 
 	precious = 0;
 	p = lookup(".PRECIOUS");
 	for (q = p->deps; q && *q; q++) {
 		if (strcmp((*q)->name, tp->name) == 0) {
 			precious = 1;
 			break;
 		}
 	}
 
 	if (!precious && !nflag && !qflag && !is_dir(tp->name)) {
 		printf("make: trying to remove target %s\n", tp->name);
 		remove(tp->name);
 	}
 
 	signal(sig, SIG_DFL);
 	raise(sig);
 }
 
 static int
 depends(char *target, char *dep)
 {
 	int i;
 	Target **p, *tp = lookup(target);
 
 	for (p = tp->deps; p && *p; ++p) {
 		if (strcmp((*p)->name, target) == 0)
 			return 1;
 	}
 
 	return 0;
 }
 
 static int
 is_suffix(char *s)
 {
 	int n;
 
 	if (s[0] != '.')
 		return 0;
 
 	for (n = 0; s = strchr(s, '.'); n++)
 		s++;
 
 	return n == 2;
 }
 
 void
 addtarget(char *target, int ndeps)
 {
 	Target *tp = lookup(target);
 
 	tp->defined = 1;
 	if (!deftarget && target[0] != '.') {
 		deftarget = tp;
 		return;
 	}
 
 	if (strcmp(target, ".SUFFIXES") == 0 && ndeps == 0) {
 		free(tp->deps);
 		tp->deps = NULL;
 		tp->ndeps = 0;
 		return;
 	}
 
 	if (strcmp(target, ".DEFAULT") == 0) {
 		if (ndeps > 0)
 			error("DEFAULT rule with prerequisites");
 		return;
 	}
 
 	if (strcmp(target, ".SILENT") == 0 && ndeps == 0) {
 		sflag = 1;
 		return;
 	}
 
 	if (strcmp(target, ".IGNORE") == 0 && ndeps == 0) {
 		iflag = 1;
 		return;
 	}
 }
 
 void
 adddep(char *target, char *dep)
 {
 	int i;
 	size_t siz;
 	Target **p, *tp = lookup(target);
 
 	if (depends(dep, target)) {
 		warning("circular dependency %s <- %s dropped", target, dep);
 		return;
 	}
 
 	for (p = tp->deps; p && *p; ++p) {
 		if (strcmp((*p)->name, dep) == 0)
 			return;
 	}
 
 	tp->ndeps++;
 	siz = (tp->ndeps + 1) * sizeof(Target *);
 	tp->deps = erealloc(tp->deps, siz);
 	tp->deps[tp->ndeps-1] = lookup(dep);
 	tp->deps[tp->ndeps] = NULL;
 
 	debug("adding dependency %s <- %s", target, dep);
 }
 
 static void
 freeaction(struct action *act)
 {
 	free(act->line);
 	freeloc(&act->loc);
 }
 
 void
 addrule(char *target, struct action  *acts, int n)
 {
 	int i;
 	struct action *v;
 	Target *tp = lookup(target);
 
 	debug("adding actions for target %s", target);
 
 	if (tp->actions) {
 		debug("overring actions of target %s", target);
 		for (i = 0; i < tp->nactions; i++)
 			freeaction(&tp->actions[i]);
 		free(tp->actions);
 	}
 
 	v = emalloc(n * sizeof(*v));
 	for (i = 0; i < n; i++) {
 		v[i].line = estrdup(acts[i].line);
 		v[i].loc.lineno = acts[i].loc.lineno;
 		v[i].loc.fname = estrdup(acts[i].loc.fname);
 	}
 
 	tp->nactions = n;
 	tp->actions = v;
 }
 
 static int
 execline(Target *tp, char *line, int ignore, int silence)
 {
 	char *s, *t;
 	Target *p, **q;
 	int r, at, plus, minus, l;
 
 	debug("executing '%s'", line);
 
 	at = plus = minus = 0;
 	for (s = line; ; s++) {
 		switch (*s) {
 		case '@':
 			at = 1;
 			break;
 		case '-':
 			minus = 1;
 			break;
 		case '+':
 			plus = 1;
 			break;
 		default:
 			goto out_loop;
 		}
 	}
 
 out_loop:
 	/* unescape $$ */
 	for (l = strlen(s)+1, t = s; *t; --l, ++t) {
 		if (t[0] == '$' && t[1] == '$') {
 			memmove(t+1, t+2, l-2);
 			l--;
 		}
 	}
 
 	if (tflag && !plus)
 		return 0;
 
 	if (sflag || silence || (qflag && !plus))
 		at = 1;
 	if (nflag)
 		at = 0;
 	if (!at) {
 		puts(s);
 		fflush(stdout);
 	}
 
 	if ((nflag || qflag) && !plus) {
 		if (qflag)
 			exitstatus = 1;
 		return 0;
 	}
 
 	if (minus || iflag || ignore)
 		ignore = 1;
 
 	r = launch(s, ignore);
 	if (ignore)
 		return 0;
 
 	return r;
 }
 
 static int
 touch(char *name, int ignore, int silence)
 {
 	char *cmd;
 	int r, n;
 
 	n = snprintf(NULL, 0, "touch %s", name) + 1;
 	cmd = emalloc(n);
 	snprintf(cmd, n, "touch %s", name);
 
 	if (!sflag && !silence)
 		puts(cmd);
 
 	r = system(cmd);
 	free(cmd);
 
 	if (ignore || iflag)
 		return 0;
 
 	return r;
 }
 
 static int
 touchdeps(Target *tp, int ignore, int silent)
 {
 	int r;
 	Target **p;
 
 	if (tp->req) {
 		r = touch(tp->req, silent, ignore);
 		if (r)
 			return r;
 	}
 
 	for (p = tp->deps; p && *p; ++p) {
 		r = touch((*p)->name, silent, ignore);
 		if (r)
 			return r;
 	}
 
 	return 0;
 }
 
 static int
 run(Target *tp)
 {
 	int r, i, ignore, silent;
 	char *s;
 	Target *p, **q;
 
 	silent = 0;
 	p = lookup(".SILENT");
 	for (q = p->deps; q && *q; ++q) {
 		if (strcmp((*q)->name, tp->name) == 0) {
 			debug("target %s error silent by .SILENT", tp->name);
 			silent = 1;
 		}
 	}
 
 	ignore = 0;
 	p = lookup(".IGNORE");
 	for (q = p->deps; q && *q; ++q) {
 		if (strcmp((*q)->name, tp->name) == 0) {
 			debug("target %s error ignored by .IGNORE", tp->name);
 			ignore = 1;
 		}
 	}
 
 	if (tflag) {
 		r = touchdeps(tp, ignore, silent);
 		if (r)
 			return r;
 	}
 
 	for (i = 0; i < tp->nactions; i++) {
 		struct action *p;
 
 		if (stop)
 			cleanup(tp);
 
 		p = &tp->actions[i];
 		debug("executing action '%s'", p->line);
 		s = expandstring(p->line, tp, &p->loc);
 		r = execline(tp, s, ignore, silent);
 		free(s);
 
 		if (r)
 			return r;
 	}
 
 	if (tflag) {
 		r = touch(tp->target, ignore, silent);
 		if (r)
 			return r;
 	}
 
 	return 0;
 }
 
 static int
 enabled(char *suffix)
 {
 	Target **p, *tp = lookup(".SUFFIXES");
 
 	for (p = tp->deps; p && *p; ++p) {
 		if (strcmp(suffix, (*p)->name) == 0)
 			return 1;
 	}
 
 	return 0;
 }
 
 static Target *
 inference(Target *tp, int force)
 {
 	time_t t;
 	int tolen, r;
 	char *to, *from;
 	Target *q, **p, *suffixes;
 	char buf[FILENAME_MAX], fname[FILENAME_MAX];
 
 	debug("searching an inference rule for %s", tp->name);
 
 	to = strrchr(tp->name, '.');
 	if (to && !enabled(to))
 		return NULL;
 	tolen = to ? to - tp->name : strlen(tp->name);
 
 	if (!to)
 		to = "";
 
 	suffixes = lookup(".SUFFIXES");
 	for (p = suffixes->deps; p && *p; ++p) {
 		from = (*p)->name;
 		debug("trying suffix %s", from);
 
 		r = snprintf(buf,
 		             sizeof(buf),
 		             "%s%s",
 		             from, to);
 
 		if (r < 0 || r >= sizeof(buf))
 			error("suffixes too long %s %s", from, to);
 
 		q = lookup(buf);
 		if (!q->actions)
 			continue;
 
 		r = snprintf(fname,
 		             sizeof(fname),
 		             "%*.*s%s",
 		             tolen, tolen, tp->name, from);
 
 		if (r < 0 || r >= sizeof(fname)) {
 			error("prerequisite name too long %s %s",
 			      tp->name, from);
 		}
 
 		debug("\tsearching prerequisite %s", fname);
 
 		t = stamp(fname);
 		if (t == -1) {
 			debug("\tprerequisite %s not found", fname);
 			continue;
 		}
 
 		if (!force && t <= tp->stamp) {
 			debug("\tdiscarded because is newer");
 			debug("\t%s: %s", tp->name, ctime(&tp->stamp));
 			debug("\t%s: %s", fname, ctime(&t));
 			continue;
 		}
 
 		free(q->req);
 		q->req = estrdup(fname);
 		q->deps = tp->deps;
 		q->target = tp->name;
 		q->stamp = tp->stamp;
 
 		debug("using inference rule %s with %s", q->name, fname);
 		return q;
 	}
 
 	return NULL;
 }
 
 static int
 update(Target *tp)
 {
 	Target *p;
 
 	debug("%s needs to be updated", tp->name);
 
 	if (tp->actions) {
 		debug("using target rule to build %s", tp->name);
 		return run(tp);
 	}
 
 	if ((p = inference(tp, FORCE)) != NULL) {
 		debug("using inference rule %s", p->name);
 		return run(p);
 	}
 
 	p = lookup(".DEFAULT");
 	if (p->defined) {
 		debug("using default rule");
 		return run(p);
 	}
 
 	debug("not rule found to update %s", tp->name);
 
 	if (!tp->defined)
 		error("don't know how to make %s", tp->name);
 
 	return 0;
 }
 
 static int 
 rebuild(Target *tp, int *buildp)
 {
 	Target **p, *q;;
 	int r, need, build, err, def;
 
 	debug("checking rebuild of %s", tp->name);
 
 	tp->stamp = stamp(tp->name);
 
 	def = err = need = 0;
 	for (p = tp->deps; p && *p; ++p) {
 		if (stop)
 			cleanup(tp);
 
 		q = *p;
 		debug("checking dependency %s", q->name);
 
 		if (strcmp(q->name, tp->name) == 0 && q->actions)
 			def = 1;
 
 		build = 0;
 		if (rebuild(q, &build) != 0) {
 			err = 1;
 			continue;
 		}
 
 		if (build) {
 			debug("rebuild of %s forces rebuild of %s",
 			       q->name, tp->name);
 			need = 1;
 		} else if (q->stamp > tp->stamp) {
 			debug("dependency %s is newer than %s",
 			      q->name, tp->name);
 			need = 1;
 		}
 	}
 
 	if (tp->stamp == -1) {
 		need = 1;
 	} else if (!def)  {
 		debug("no action found for %s, looking a inference rule",
 		      tp->name);
 		if (inference(tp, NOFORCE))
 			need = 1;
 	}
 
 	if (err) {
 		warning("target %s not remade because of errors", tp->name);
 		return 1;
 	} else if (need) {
 		*buildp = 1;
 
 		debug("target %s needs updating", tp->name);
 		r = update(tp);
 		if (r == 0)
 			return 0;
 
 		if (stop)
 			cleanup(tp);
 
 		exitstatus = 1;
 
 		if (!kflag)
 			error("target %s: error %d", tp->name, r);
 		else
 			warning("target %s: error %d", tp->name, r);
 		return r;
 	}
 
 	return 0;
 }
 
 int
 build(char *name)
 {
 	int build, r;
 
 	if (!name) {
 		if (!deftarget) {
 			printf("make: no target to make\n");
 			return 0;
 		}
 		name = deftarget->name;
 	}
 
 	debug("checking target %s", name);
 
 	build = 0;
 	return rebuild(lookup(name), &build);
 }