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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
4 */
5
6#include <sys/types.h>
7#include <ctype.h>
8#include <stdlib.h>
9#include <string.h>
10#include <regex.h>
11
12#include "lkc.h"
13
14struct symbol symbol_yes = {
15 .name = "y",
16 .curr = { "y", yes },
17 .flags = SYMBOL_CONST|SYMBOL_VALID,
18};
19
20struct symbol symbol_mod = {
21 .name = "m",
22 .curr = { "m", mod },
23 .flags = SYMBOL_CONST|SYMBOL_VALID,
24};
25
26struct symbol symbol_no = {
27 .name = "n",
28 .curr = { "n", no },
29 .flags = SYMBOL_CONST|SYMBOL_VALID,
30};
31
32static struct symbol symbol_empty = {
33 .name = "",
34 .curr = { "", no },
35 .flags = SYMBOL_VALID,
36};
37
38struct symbol *modules_sym;
39static tristate modules_val;
40
41enum symbol_type sym_get_type(struct symbol *sym)
42{
43 enum symbol_type type = sym->type;
44
45 if (type == S_TRISTATE) {
46 if (sym_is_choice_value(sym) && sym->visible == yes)
47 type = S_BOOLEAN;
48 else if (modules_val == no)
49 type = S_BOOLEAN;
50 }
51 return type;
52}
53
54const char *sym_type_name(enum symbol_type type)
55{
56 switch (type) {
57 case S_BOOLEAN:
58 return "bool";
59 case S_TRISTATE:
60 return "tristate";
61 case S_INT:
62 return "integer";
63 case S_HEX:
64 return "hex";
65 case S_STRING:
66 return "string";
67 case S_UNKNOWN:
68 return "unknown";
69 }
70 return "???";
71}
72
73struct property *sym_get_choice_prop(struct symbol *sym)
74{
75 struct property *prop;
76
77 for_all_choices(sym, prop)
78 return prop;
79 return NULL;
80}
81
82static struct property *sym_get_default_prop(struct symbol *sym)
83{
84 struct property *prop;
85
86 for_all_defaults(sym, prop) {
87 prop->visible.tri = expr_calc_value(prop->visible.expr);
88 if (prop->visible.tri != no)
89 return prop;
90 }
91 return NULL;
92}
93
94struct property *sym_get_range_prop(struct symbol *sym)
95{
96 struct property *prop;
97
98 for_all_properties(sym, prop, P_RANGE) {
99 prop->visible.tri = expr_calc_value(prop->visible.expr);
100 if (prop->visible.tri != no)
101 return prop;
102 }
103 return NULL;
104}
105
106static long long sym_get_range_val(struct symbol *sym, int base)
107{
108 sym_calc_value(sym);
109 switch (sym->type) {
110 case S_INT:
111 base = 10;
112 break;
113 case S_HEX:
114 base = 16;
115 break;
116 default:
117 break;
118 }
119 return strtoll(sym->curr.val, NULL, base);
120}
121
122static void sym_validate_range(struct symbol *sym)
123{
124 struct property *prop;
125 int base;
126 long long val, val2;
127 char str[64];
128
129 switch (sym->type) {
130 case S_INT:
131 base = 10;
132 break;
133 case S_HEX:
134 base = 16;
135 break;
136 default:
137 return;
138 }
139 prop = sym_get_range_prop(sym);
140 if (!prop)
141 return;
142 val = strtoll(sym->curr.val, NULL, base);
143 val2 = sym_get_range_val(prop->expr->left.sym, base);
144 if (val >= val2) {
145 val2 = sym_get_range_val(prop->expr->right.sym, base);
146 if (val <= val2)
147 return;
148 }
149 if (sym->type == S_INT)
150 sprintf(str, "%lld", val2);
151 else
152 sprintf(str, "0x%llx", val2);
153 sym->curr.val = xstrdup(str);
154}
155
156static void sym_set_changed(struct symbol *sym)
157{
158 struct property *prop;
159
160 sym->flags |= SYMBOL_CHANGED;
161 for (prop = sym->prop; prop; prop = prop->next) {
162 if (prop->menu)
163 prop->menu->flags |= MENU_CHANGED;
164 }
165}
166
167static void sym_set_all_changed(void)
168{
169 struct symbol *sym;
170 int i;
171
172 for_all_symbols(i, sym)
173 sym_set_changed(sym);
174}
175
176static void sym_calc_visibility(struct symbol *sym)
177{
178 struct property *prop;
179 struct symbol *choice_sym = NULL;
180 tristate tri;
181
182 /* any prompt visible? */
183 tri = no;
184
185 if (sym_is_choice_value(sym))
186 choice_sym = prop_get_symbol(sym_get_choice_prop(sym));
187
188 for_all_prompts(sym, prop) {
189 prop->visible.tri = expr_calc_value(prop->visible.expr);
190 /*
191 * Tristate choice_values with visibility 'mod' are
192 * not visible if the corresponding choice's value is
193 * 'yes'.
194 */
195 if (choice_sym && sym->type == S_TRISTATE &&
196 prop->visible.tri == mod && choice_sym->curr.tri == yes)
197 prop->visible.tri = no;
198
199 tri = EXPR_OR(tri, prop->visible.tri);
200 }
201 if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
202 tri = yes;
203 if (sym->visible != tri) {
204 sym->visible = tri;
205 sym_set_changed(sym);
206 }
207 if (sym_is_choice_value(sym))
208 return;
209 /* defaulting to "yes" if no explicit "depends on" are given */
210 tri = yes;
211 if (sym->dir_dep.expr)
212 tri = expr_calc_value(sym->dir_dep.expr);
213 if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
214 tri = yes;
215 if (sym->dir_dep.tri != tri) {
216 sym->dir_dep.tri = tri;
217 sym_set_changed(sym);
218 }
219 tri = no;
220 if (sym->rev_dep.expr)
221 tri = expr_calc_value(sym->rev_dep.expr);
222 if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
223 tri = yes;
224 if (sym->rev_dep.tri != tri) {
225 sym->rev_dep.tri = tri;
226 sym_set_changed(sym);
227 }
228 tri = no;
229 if (sym->implied.expr)
230 tri = expr_calc_value(sym->implied.expr);
231 if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
232 tri = yes;
233 if (sym->implied.tri != tri) {
234 sym->implied.tri = tri;
235 sym_set_changed(sym);
236 }
237}
238
239/*
240 * Find the default symbol for a choice.
241 * First try the default values for the choice symbol
242 * Next locate the first visible choice value
243 * Return NULL if none was found
244 */
245struct symbol *sym_choice_default(struct symbol *sym)
246{
247 struct symbol *def_sym;
248 struct property *prop;
249 struct expr *e;
250
251 /* any of the defaults visible? */
252 for_all_defaults(sym, prop) {
253 prop->visible.tri = expr_calc_value(prop->visible.expr);
254 if (prop->visible.tri == no)
255 continue;
256 def_sym = prop_get_symbol(prop);
257 if (def_sym->visible != no)
258 return def_sym;
259 }
260
261 /* just get the first visible value */
262 prop = sym_get_choice_prop(sym);
263 expr_list_for_each_sym(prop->expr, e, def_sym)
264 if (def_sym->visible != no)
265 return def_sym;
266
267 /* failed to locate any defaults */
268 return NULL;
269}
270
271static struct symbol *sym_calc_choice(struct symbol *sym)
272{
273 struct symbol *def_sym;
274 struct property *prop;
275 struct expr *e;
276 int flags;
277
278 /* first calculate all choice values' visibilities */
279 flags = sym->flags;
280 prop = sym_get_choice_prop(sym);
281 expr_list_for_each_sym(prop->expr, e, def_sym) {
282 sym_calc_visibility(def_sym);
283 if (def_sym->visible != no)
284 flags &= def_sym->flags;
285 }
286
287 sym->flags &= flags | ~SYMBOL_DEF_USER;
288
289 /* is the user choice visible? */
290 def_sym = sym->def[S_DEF_USER].val;
291 if (def_sym && def_sym->visible != no)
292 return def_sym;
293
294 def_sym = sym_choice_default(sym);
295
296 if (def_sym == NULL)
297 /* no choice? reset tristate value */
298 sym->curr.tri = no;
299
300 return def_sym;
301}
302
303static void sym_warn_unmet_dep(struct symbol *sym)
304{
305 struct gstr gs = str_new();
306
307 str_printf(&gs,
308 "\nWARNING: unmet direct dependencies detected for %s\n",
309 sym->name);
310 str_printf(&gs,
311 " Depends on [%c]: ",
312 sym->dir_dep.tri == mod ? 'm' : 'n');
313 expr_gstr_print(sym->dir_dep.expr, &gs);
314 str_printf(&gs, "\n");
315
316 expr_gstr_print_revdep(sym->rev_dep.expr, &gs, yes,
317 " Selected by [y]:\n");
318 expr_gstr_print_revdep(sym->rev_dep.expr, &gs, mod,
319 " Selected by [m]:\n");
320
321 fputs(str_get(&gs), stderr);
322}
323
324void sym_calc_value(struct symbol *sym)
325{
326 struct symbol_value newval, oldval;
327 struct property *prop;
328 struct expr *e;
329
330 if (!sym)
331 return;
332
333 if (sym->flags & SYMBOL_VALID)
334 return;
335
336 if (sym_is_choice_value(sym) &&
337 sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES) {
338 sym->flags &= ~SYMBOL_NEED_SET_CHOICE_VALUES;
339 prop = sym_get_choice_prop(sym);
340 sym_calc_value(prop_get_symbol(prop));
341 }
342
343 sym->flags |= SYMBOL_VALID;
344
345 oldval = sym->curr;
346
347 switch (sym->type) {
348 case S_INT:
349 case S_HEX:
350 case S_STRING:
351 newval = symbol_empty.curr;
352 break;
353 case S_BOOLEAN:
354 case S_TRISTATE:
355 newval = symbol_no.curr;
356 break;
357 default:
358 sym->curr.val = sym->name;
359 sym->curr.tri = no;
360 return;
361 }
362 sym->flags &= ~SYMBOL_WRITE;
363
364 sym_calc_visibility(sym);
365
366 if (sym->visible != no)
367 sym->flags |= SYMBOL_WRITE;
368
369 /* set default if recursively called */
370 sym->curr = newval;
371
372 switch (sym_get_type(sym)) {
373 case S_BOOLEAN:
374 case S_TRISTATE:
375 if (sym_is_choice_value(sym) && sym->visible == yes) {
376 prop = sym_get_choice_prop(sym);
377 newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
378 } else {
379 if (sym->visible != no) {
380 /* if the symbol is visible use the user value
381 * if available, otherwise try the default value
382 */
383 if (sym_has_value(sym)) {
384 newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
385 sym->visible);
386 goto calc_newval;
387 }
388 }
389 if (sym->rev_dep.tri != no)
390 sym->flags |= SYMBOL_WRITE;
391 if (!sym_is_choice(sym)) {
392 prop = sym_get_default_prop(sym);
393 if (prop) {
394 newval.tri = EXPR_AND(expr_calc_value(prop->expr),
395 prop->visible.tri);
396 if (newval.tri != no)
397 sym->flags |= SYMBOL_WRITE;
398 }
399 if (sym->implied.tri != no) {
400 sym->flags |= SYMBOL_WRITE;
401 newval.tri = EXPR_OR(newval.tri, sym->implied.tri);
402 newval.tri = EXPR_AND(newval.tri,
403 sym->dir_dep.tri);
404 }
405 }
406 calc_newval:
407 if (sym->dir_dep.tri < sym->rev_dep.tri)
408 sym_warn_unmet_dep(sym);
409 newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
410 }
411 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
412 newval.tri = yes;
413 break;
414 case S_STRING:
415 case S_HEX:
416 case S_INT:
417 if (sym->visible != no && sym_has_value(sym)) {
418 newval.val = sym->def[S_DEF_USER].val;
419 break;
420 }
421 prop = sym_get_default_prop(sym);
422 if (prop) {
423 struct symbol *ds = prop_get_symbol(prop);
424 if (ds) {
425 sym->flags |= SYMBOL_WRITE;
426 sym_calc_value(ds);
427 newval.val = ds->curr.val;
428 }
429 }
430 break;
431 default:
432 ;
433 }
434
435 sym->curr = newval;
436 if (sym_is_choice(sym) && newval.tri == yes)
437 sym->curr.val = sym_calc_choice(sym);
438 sym_validate_range(sym);
439
440 if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
441 sym_set_changed(sym);
442 if (modules_sym == sym) {
443 sym_set_all_changed();
444 modules_val = modules_sym->curr.tri;
445 }
446 }
447
448 if (sym_is_choice(sym)) {
449 struct symbol *choice_sym;
450
451 prop = sym_get_choice_prop(sym);
452 expr_list_for_each_sym(prop->expr, e, choice_sym) {
453 if ((sym->flags & SYMBOL_WRITE) &&
454 choice_sym->visible != no)
455 choice_sym->flags |= SYMBOL_WRITE;
456 if (sym->flags & SYMBOL_CHANGED)
457 sym_set_changed(choice_sym);
458 }
459 }
460
461 if (sym->flags & SYMBOL_NO_WRITE)
462 sym->flags &= ~SYMBOL_WRITE;
463
464 if (sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES)
465 set_all_choice_values(sym);
466}
467
468void sym_clear_all_valid(void)
469{
470 struct symbol *sym;
471 int i;
472
473 for_all_symbols(i, sym)
474 sym->flags &= ~SYMBOL_VALID;
475 conf_set_changed(true);
476 sym_calc_value(modules_sym);
477}
478
479bool sym_tristate_within_range(struct symbol *sym, tristate val)
480{
481 int type = sym_get_type(sym);
482
483 if (sym->visible == no)
484 return false;
485
486 if (type != S_BOOLEAN && type != S_TRISTATE)
487 return false;
488
489 if (type == S_BOOLEAN && val == mod)
490 return false;
491 if (sym->visible <= sym->rev_dep.tri)
492 return false;
493 if (sym_is_choice_value(sym) && sym->visible == yes)
494 return val == yes;
495 return val >= sym->rev_dep.tri && val <= sym->visible;
496}
497
498bool sym_set_tristate_value(struct symbol *sym, tristate val)
499{
500 tristate oldval = sym_get_tristate_value(sym);
501
502 if (oldval != val && !sym_tristate_within_range(sym, val))
503 return false;
504
505 if (!(sym->flags & SYMBOL_DEF_USER)) {
506 sym->flags |= SYMBOL_DEF_USER;
507 sym_set_changed(sym);
508 }
509 /*
510 * setting a choice value also resets the new flag of the choice
511 * symbol and all other choice values.
512 */
513 if (sym_is_choice_value(sym) && val == yes) {
514 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
515 struct property *prop;
516 struct expr *e;
517
518 cs->def[S_DEF_USER].val = sym;
519 cs->flags |= SYMBOL_DEF_USER;
520 prop = sym_get_choice_prop(cs);
521 for (e = prop->expr; e; e = e->left.expr) {
522 if (e->right.sym->visible != no)
523 e->right.sym->flags |= SYMBOL_DEF_USER;
524 }
525 }
526
527 sym->def[S_DEF_USER].tri = val;
528 if (oldval != val)
529 sym_clear_all_valid();
530
531 return true;
532}
533
534tristate sym_toggle_tristate_value(struct symbol *sym)
535{
536 tristate oldval, newval;
537
538 oldval = newval = sym_get_tristate_value(sym);
539 do {
540 switch (newval) {
541 case no:
542 newval = mod;
543 break;
544 case mod:
545 newval = yes;
546 break;
547 case yes:
548 newval = no;
549 break;
550 }
551 if (sym_set_tristate_value(sym, newval))
552 break;
553 } while (oldval != newval);
554 return newval;
555}
556
557bool sym_string_valid(struct symbol *sym, const char *str)
558{
559 signed char ch;
560
561 switch (sym->type) {
562 case S_STRING:
563 return true;
564 case S_INT:
565 ch = *str++;
566 if (ch == '-')
567 ch = *str++;
568 if (!isdigit(ch))
569 return false;
570 if (ch == '0' && *str != 0)
571 return false;
572 while ((ch = *str++)) {
573 if (!isdigit(ch))
574 return false;
575 }
576 return true;
577 case S_HEX:
578 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
579 str += 2;
580 ch = *str++;
581 do {
582 if (!isxdigit(ch))
583 return false;
584 } while ((ch = *str++));
585 return true;
586 case S_BOOLEAN:
587 case S_TRISTATE:
588 switch (str[0]) {
589 case 'y': case 'Y':
590 case 'm': case 'M':
591 case 'n': case 'N':
592 return true;
593 }
594 return false;
595 default:
596 return false;
597 }
598}
599
600bool sym_string_within_range(struct symbol *sym, const char *str)
601{
602 struct property *prop;
603 long long val;
604
605 switch (sym->type) {
606 case S_STRING:
607 return sym_string_valid(sym, str);
608 case S_INT:
609 if (!sym_string_valid(sym, str))
610 return false;
611 prop = sym_get_range_prop(sym);
612 if (!prop)
613 return true;
614 val = strtoll(str, NULL, 10);
615 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
616 val <= sym_get_range_val(prop->expr->right.sym, 10);
617 case S_HEX:
618 if (!sym_string_valid(sym, str))
619 return false;
620 prop = sym_get_range_prop(sym);
621 if (!prop)
622 return true;
623 val = strtoll(str, NULL, 16);
624 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
625 val <= sym_get_range_val(prop->expr->right.sym, 16);
626 case S_BOOLEAN:
627 case S_TRISTATE:
628 switch (str[0]) {
629 case 'y': case 'Y':
630 return sym_tristate_within_range(sym, yes);
631 case 'm': case 'M':
632 return sym_tristate_within_range(sym, mod);
633 case 'n': case 'N':
634 return sym_tristate_within_range(sym, no);
635 }
636 return false;
637 default:
638 return false;
639 }
640}
641
642bool sym_set_string_value(struct symbol *sym, const char *newval)
643{
644 const char *oldval;
645 char *val;
646 int size;
647
648 switch (sym->type) {
649 case S_BOOLEAN:
650 case S_TRISTATE:
651 switch (newval[0]) {
652 case 'y': case 'Y':
653 return sym_set_tristate_value(sym, yes);
654 case 'm': case 'M':
655 return sym_set_tristate_value(sym, mod);
656 case 'n': case 'N':
657 return sym_set_tristate_value(sym, no);
658 }
659 return false;
660 default:
661 ;
662 }
663
664 if (!sym_string_within_range(sym, newval))
665 return false;
666
667 if (!(sym->flags & SYMBOL_DEF_USER)) {
668 sym->flags |= SYMBOL_DEF_USER;
669 sym_set_changed(sym);
670 }
671
672 oldval = sym->def[S_DEF_USER].val;
673 size = strlen(newval) + 1;
674 if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
675 size += 2;
676 sym->def[S_DEF_USER].val = val = xmalloc(size);
677 *val++ = '0';
678 *val++ = 'x';
679 } else if (!oldval || strcmp(oldval, newval))
680 sym->def[S_DEF_USER].val = val = xmalloc(size);
681 else
682 return true;
683
684 strcpy(val, newval);
685 free((void *)oldval);
686 sym_clear_all_valid();
687
688 return true;
689}
690
691/*
692 * Find the default value associated to a symbol.
693 * For tristate symbol handle the modules=n case
694 * in which case "m" becomes "y".
695 * If the symbol does not have any default then fallback
696 * to the fixed default values.
697 */
698const char *sym_get_string_default(struct symbol *sym)
699{
700 struct property *prop;
701 struct symbol *ds;
702 const char *str;
703 tristate val;
704
705 sym_calc_visibility(sym);
706 sym_calc_value(modules_sym);
707 val = symbol_no.curr.tri;
708 str = symbol_empty.curr.val;
709
710 /* If symbol has a default value look it up */
711 prop = sym_get_default_prop(sym);
712 if (prop != NULL) {
713 switch (sym->type) {
714 case S_BOOLEAN:
715 case S_TRISTATE:
716 /* The visibility may limit the value from yes => mod */
717 val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
718 break;
719 default:
720 /*
721 * The following fails to handle the situation
722 * where a default value is further limited by
723 * the valid range.
724 */
725 ds = prop_get_symbol(prop);
726 if (ds != NULL) {
727 sym_calc_value(ds);
728 str = (const char *)ds->curr.val;
729 }
730 }
731 }
732
733 /* Handle select statements */
734 val = EXPR_OR(val, sym->rev_dep.tri);
735
736 /* transpose mod to yes if modules are not enabled */
737 if (val == mod)
738 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
739 val = yes;
740
741 /* transpose mod to yes if type is bool */
742 if (sym->type == S_BOOLEAN && val == mod)
743 val = yes;
744
745 /* adjust the default value if this symbol is implied by another */
746 if (val < sym->implied.tri)
747 val = sym->implied.tri;
748
749 switch (sym->type) {
750 case S_BOOLEAN:
751 case S_TRISTATE:
752 switch (val) {
753 case no: return "n";
754 case mod: return "m";
755 case yes: return "y";
756 }
757 case S_INT:
758 case S_HEX:
759 return str;
760 case S_STRING:
761 return str;
762 case S_UNKNOWN:
763 break;
764 }
765 return "";
766}
767
768const char *sym_get_string_value(struct symbol *sym)
769{
770 tristate val;
771
772 switch (sym->type) {
773 case S_BOOLEAN:
774 case S_TRISTATE:
775 val = sym_get_tristate_value(sym);
776 switch (val) {
777 case no:
778 return "n";
779 case mod:
780 sym_calc_value(modules_sym);
781 return (modules_sym->curr.tri == no) ? "n" : "m";
782 case yes:
783 return "y";
784 }
785 break;
786 default:
787 ;
788 }
789 return (const char *)sym->curr.val;
790}
791
792bool sym_is_changeable(struct symbol *sym)
793{
794 return sym->visible > sym->rev_dep.tri;
795}
796
797static unsigned strhash(const char *s)
798{
799 /* fnv32 hash */
800 unsigned hash = 2166136261U;
801 for (; *s; s++)
802 hash = (hash ^ *s) * 0x01000193;
803 return hash;
804}
805
806struct symbol *sym_lookup(const char *name, int flags)
807{
808 struct symbol *symbol;
809 char *new_name;
810 int hash;
811
812 if (name) {
813 if (name[0] && !name[1]) {
814 switch (name[0]) {
815 case 'y': return &symbol_yes;
816 case 'm': return &symbol_mod;
817 case 'n': return &symbol_no;
818 }
819 }
820 hash = strhash(name) % SYMBOL_HASHSIZE;
821
822 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
823 if (symbol->name &&
824 !strcmp(symbol->name, name) &&
825 (flags ? symbol->flags & flags
826 : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
827 return symbol;
828 }
829 new_name = xstrdup(name);
830 } else {
831 new_name = NULL;
832 hash = 0;
833 }
834
835 symbol = xmalloc(sizeof(*symbol));
836 memset(symbol, 0, sizeof(*symbol));
837 symbol->name = new_name;
838 symbol->type = S_UNKNOWN;
839 symbol->flags = flags;
840
841 symbol->next = symbol_hash[hash];
842 symbol_hash[hash] = symbol;
843
844 return symbol;
845}
846
847struct symbol *sym_find(const char *name)
848{
849 struct symbol *symbol = NULL;
850 int hash = 0;
851
852 if (!name)
853 return NULL;
854
855 if (name[0] && !name[1]) {
856 switch (name[0]) {
857 case 'y': return &symbol_yes;
858 case 'm': return &symbol_mod;
859 case 'n': return &symbol_no;
860 }
861 }
862 hash = strhash(name) % SYMBOL_HASHSIZE;
863
864 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
865 if (symbol->name &&
866 !strcmp(symbol->name, name) &&
867 !(symbol->flags & SYMBOL_CONST))
868 break;
869 }
870
871 return symbol;
872}
873
874const char *sym_escape_string_value(const char *in)
875{
876 const char *p;
877 size_t reslen;
878 char *res;
879 size_t l;
880
881 reslen = strlen(in) + strlen("\"\"") + 1;
882
883 p = in;
884 for (;;) {
885 l = strcspn(p, "\"\\");
886 p += l;
887
888 if (p[0] == '\0')
889 break;
890
891 reslen++;
892 p++;
893 }
894
895 res = xmalloc(reslen);
896 res[0] = '\0';
897
898 strcat(res, "\"");
899
900 p = in;
901 for (;;) {
902 l = strcspn(p, "\"\\");
903 strncat(res, p, l);
904 p += l;
905
906 if (p[0] == '\0')
907 break;
908
909 strcat(res, "\\");
910 strncat(res, p++, 1);
911 }
912
913 strcat(res, "\"");
914 return res;
915}
916
917struct sym_match {
918 struct symbol *sym;
919 off_t so, eo;
920};
921
922/* Compare matched symbols as thus:
923 * - first, symbols that match exactly
924 * - then, alphabetical sort
925 */
926static int sym_rel_comp(const void *sym1, const void *sym2)
927{
928 const struct sym_match *s1 = sym1;
929 const struct sym_match *s2 = sym2;
930 int exact1, exact2;
931
932 /* Exact match:
933 * - if matched length on symbol s1 is the length of that symbol,
934 * then this symbol should come first;
935 * - if matched length on symbol s2 is the length of that symbol,
936 * then this symbol should come first.
937 * Note: since the search can be a regexp, both symbols may match
938 * exactly; if this is the case, we can't decide which comes first,
939 * and we fallback to sorting alphabetically.
940 */
941 exact1 = (s1->eo - s1->so) == strlen(s1->sym->name);
942 exact2 = (s2->eo - s2->so) == strlen(s2->sym->name);
943 if (exact1 && !exact2)
944 return -1;
945 if (!exact1 && exact2)
946 return 1;
947
948 /* As a fallback, sort symbols alphabetically */
949 return strcmp(s1->sym->name, s2->sym->name);
950}
951
952struct symbol **sym_re_search(const char *pattern)
953{
954 struct symbol *sym, **sym_arr = NULL;
955 struct sym_match *sym_match_arr = NULL;
956 int i, cnt, size;
957 regex_t re;
958 regmatch_t match[1];
959
960 cnt = size = 0;
961 /* Skip if empty */
962 if (strlen(pattern) == 0)
963 return NULL;
964 if (regcomp(&re, pattern, REG_EXTENDED|REG_ICASE))
965 return NULL;
966
967 for_all_symbols(i, sym) {
968 if (sym->flags & SYMBOL_CONST || !sym->name)
969 continue;
970 if (regexec(&re, sym->name, 1, match, 0))
971 continue;
972 if (cnt >= size) {
973 void *tmp;
974 size += 16;
975 tmp = realloc(sym_match_arr, size * sizeof(struct sym_match));
976 if (!tmp)
977 goto sym_re_search_free;
978 sym_match_arr = tmp;
979 }
980 sym_calc_value(sym);
981 /* As regexec returned 0, we know we have a match, so
982 * we can use match[0].rm_[se]o without further checks
983 */
984 sym_match_arr[cnt].so = match[0].rm_so;
985 sym_match_arr[cnt].eo = match[0].rm_eo;
986 sym_match_arr[cnt++].sym = sym;
987 }
988 if (sym_match_arr) {
989 qsort(sym_match_arr, cnt, sizeof(struct sym_match), sym_rel_comp);
990 sym_arr = malloc((cnt+1) * sizeof(struct symbol *));
991 if (!sym_arr)
992 goto sym_re_search_free;
993 for (i = 0; i < cnt; i++)
994 sym_arr[i] = sym_match_arr[i].sym;
995 sym_arr[cnt] = NULL;
996 }
997sym_re_search_free:
998 /* sym_match_arr can be NULL if no match, but free(NULL) is OK */
999 free(sym_match_arr);
1000 regfree(&re);
1001
1002 return sym_arr;
1003}
1004
1005/*
1006 * When we check for recursive dependencies we use a stack to save
1007 * current state so we can print out relevant info to user.
1008 * The entries are located on the call stack so no need to free memory.
1009 * Note insert() remove() must always match to properly clear the stack.
1010 */
1011static struct dep_stack {
1012 struct dep_stack *prev, *next;
1013 struct symbol *sym;
1014 struct property *prop;
1015 struct expr **expr;
1016} *check_top;
1017
1018static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
1019{
1020 memset(stack, 0, sizeof(*stack));
1021 if (check_top)
1022 check_top->next = stack;
1023 stack->prev = check_top;
1024 stack->sym = sym;
1025 check_top = stack;
1026}
1027
1028static void dep_stack_remove(void)
1029{
1030 check_top = check_top->prev;
1031 if (check_top)
1032 check_top->next = NULL;
1033}
1034
1035/*
1036 * Called when we have detected a recursive dependency.
1037 * check_top point to the top of the stact so we use
1038 * the ->prev pointer to locate the bottom of the stack.
1039 */
1040static void sym_check_print_recursive(struct symbol *last_sym)
1041{
1042 struct dep_stack *stack;
1043 struct symbol *sym, *next_sym;
1044 struct menu *menu = NULL;
1045 struct property *prop;
1046 struct dep_stack cv_stack;
1047
1048 if (sym_is_choice_value(last_sym)) {
1049 dep_stack_insert(&cv_stack, last_sym);
1050 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
1051 }
1052
1053 for (stack = check_top; stack != NULL; stack = stack->prev)
1054 if (stack->sym == last_sym)
1055 break;
1056 if (!stack) {
1057 fprintf(stderr, "unexpected recursive dependency error\n");
1058 return;
1059 }
1060
1061 for (; stack; stack = stack->next) {
1062 sym = stack->sym;
1063 next_sym = stack->next ? stack->next->sym : last_sym;
1064 prop = stack->prop;
1065 if (prop == NULL)
1066 prop = stack->sym->prop;
1067
1068 /* for choice values find the menu entry (used below) */
1069 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
1070 for (prop = sym->prop; prop; prop = prop->next) {
1071 menu = prop->menu;
1072 if (prop->menu)
1073 break;
1074 }
1075 }
1076 if (stack->sym == last_sym)
1077 fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1078 prop->file->name, prop->lineno);
1079
1080 if (sym_is_choice(sym)) {
1081 fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1082 menu->file->name, menu->lineno,
1083 sym->name ? sym->name : "<choice>",
1084 next_sym->name ? next_sym->name : "<choice>");
1085 } else if (sym_is_choice_value(sym)) {
1086 fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1087 menu->file->name, menu->lineno,
1088 sym->name ? sym->name : "<choice>",
1089 next_sym->name ? next_sym->name : "<choice>");
1090 } else if (stack->expr == &sym->dir_dep.expr) {
1091 fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1092 prop->file->name, prop->lineno,
1093 sym->name ? sym->name : "<choice>",
1094 next_sym->name ? next_sym->name : "<choice>");
1095 } else if (stack->expr == &sym->rev_dep.expr) {
1096 fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1097 prop->file->name, prop->lineno,
1098 sym->name ? sym->name : "<choice>",
1099 next_sym->name ? next_sym->name : "<choice>");
1100 } else if (stack->expr == &sym->implied.expr) {
1101 fprintf(stderr, "%s:%d:\tsymbol %s is implied by %s\n",
1102 prop->file->name, prop->lineno,
1103 sym->name ? sym->name : "<choice>",
1104 next_sym->name ? next_sym->name : "<choice>");
1105 } else if (stack->expr) {
1106 fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1107 prop->file->name, prop->lineno,
1108 sym->name ? sym->name : "<choice>",
1109 prop_get_type_name(prop->type),
1110 next_sym->name ? next_sym->name : "<choice>");
1111 } else {
1112 fprintf(stderr, "%s:%d:\tsymbol %s %s is visible depending on %s\n",
1113 prop->file->name, prop->lineno,
1114 sym->name ? sym->name : "<choice>",
1115 prop_get_type_name(prop->type),
1116 next_sym->name ? next_sym->name : "<choice>");
1117 }
1118 }
1119
1120 fprintf(stderr,
1121 "For a resolution refer to Documentation/kbuild/kconfig-language.rst\n"
1122 "subsection \"Kconfig recursive dependency limitations\"\n"
1123 "\n");
1124
1125 if (check_top == &cv_stack)
1126 dep_stack_remove();
1127}
1128
1129static struct symbol *sym_check_expr_deps(struct expr *e)
1130{
1131 struct symbol *sym;
1132
1133 if (!e)
1134 return NULL;
1135 switch (e->type) {
1136 case E_OR:
1137 case E_AND:
1138 sym = sym_check_expr_deps(e->left.expr);
1139 if (sym)
1140 return sym;
1141 return sym_check_expr_deps(e->right.expr);
1142 case E_NOT:
1143 return sym_check_expr_deps(e->left.expr);
1144 case E_EQUAL:
1145 case E_GEQ:
1146 case E_GTH:
1147 case E_LEQ:
1148 case E_LTH:
1149 case E_UNEQUAL:
1150 sym = sym_check_deps(e->left.sym);
1151 if (sym)
1152 return sym;
1153 return sym_check_deps(e->right.sym);
1154 case E_SYMBOL:
1155 return sym_check_deps(e->left.sym);
1156 default:
1157 break;
1158 }
1159 fprintf(stderr, "Oops! How to check %d?\n", e->type);
1160 return NULL;
1161}
1162
1163/* return NULL when dependencies are OK */
1164static struct symbol *sym_check_sym_deps(struct symbol *sym)
1165{
1166 struct symbol *sym2;
1167 struct property *prop;
1168 struct dep_stack stack;
1169
1170 dep_stack_insert(&stack, sym);
1171
1172 stack.expr = &sym->dir_dep.expr;
1173 sym2 = sym_check_expr_deps(sym->dir_dep.expr);
1174 if (sym2)
1175 goto out;
1176
1177 stack.expr = &sym->rev_dep.expr;
1178 sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1179 if (sym2)
1180 goto out;
1181
1182 stack.expr = &sym->implied.expr;
1183 sym2 = sym_check_expr_deps(sym->implied.expr);
1184 if (sym2)
1185 goto out;
1186
1187 stack.expr = NULL;
1188
1189 for (prop = sym->prop; prop; prop = prop->next) {
1190 if (prop->type == P_CHOICE || prop->type == P_SELECT ||
1191 prop->type == P_IMPLY)
1192 continue;
1193 stack.prop = prop;
1194 sym2 = sym_check_expr_deps(prop->visible.expr);
1195 if (sym2)
1196 break;
1197 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1198 continue;
1199 stack.expr = &prop->expr;
1200 sym2 = sym_check_expr_deps(prop->expr);
1201 if (sym2)
1202 break;
1203 stack.expr = NULL;
1204 }
1205
1206out:
1207 dep_stack_remove();
1208
1209 return sym2;
1210}
1211
1212static struct symbol *sym_check_choice_deps(struct symbol *choice)
1213{
1214 struct symbol *sym, *sym2;
1215 struct property *prop;
1216 struct expr *e;
1217 struct dep_stack stack;
1218
1219 dep_stack_insert(&stack, choice);
1220
1221 prop = sym_get_choice_prop(choice);
1222 expr_list_for_each_sym(prop->expr, e, sym)
1223 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1224
1225 choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1226 sym2 = sym_check_sym_deps(choice);
1227 choice->flags &= ~SYMBOL_CHECK;
1228 if (sym2)
1229 goto out;
1230
1231 expr_list_for_each_sym(prop->expr, e, sym) {
1232 sym2 = sym_check_sym_deps(sym);
1233 if (sym2)
1234 break;
1235 }
1236out:
1237 expr_list_for_each_sym(prop->expr, e, sym)
1238 sym->flags &= ~SYMBOL_CHECK;
1239
1240 if (sym2 && sym_is_choice_value(sym2) &&
1241 prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1242 sym2 = choice;
1243
1244 dep_stack_remove();
1245
1246 return sym2;
1247}
1248
1249struct symbol *sym_check_deps(struct symbol *sym)
1250{
1251 struct symbol *sym2;
1252 struct property *prop;
1253
1254 if (sym->flags & SYMBOL_CHECK) {
1255 sym_check_print_recursive(sym);
1256 return sym;
1257 }
1258 if (sym->flags & SYMBOL_CHECKED)
1259 return NULL;
1260
1261 if (sym_is_choice_value(sym)) {
1262 struct dep_stack stack;
1263
1264 /* for choice groups start the check with main choice symbol */
1265 dep_stack_insert(&stack, sym);
1266 prop = sym_get_choice_prop(sym);
1267 sym2 = sym_check_deps(prop_get_symbol(prop));
1268 dep_stack_remove();
1269 } else if (sym_is_choice(sym)) {
1270 sym2 = sym_check_choice_deps(sym);
1271 } else {
1272 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1273 sym2 = sym_check_sym_deps(sym);
1274 sym->flags &= ~SYMBOL_CHECK;
1275 }
1276
1277 return sym2;
1278}
1279
1280struct symbol *prop_get_symbol(struct property *prop)
1281{
1282 if (prop->expr && (prop->expr->type == E_SYMBOL ||
1283 prop->expr->type == E_LIST))
1284 return prop->expr->left.sym;
1285 return NULL;
1286}
1287
1288const char *prop_get_type_name(enum prop_type type)
1289{
1290 switch (type) {
1291 case P_PROMPT:
1292 return "prompt";
1293 case P_COMMENT:
1294 return "comment";
1295 case P_MENU:
1296 return "menu";
1297 case P_DEFAULT:
1298 return "default";
1299 case P_CHOICE:
1300 return "choice";
1301 case P_SELECT:
1302 return "select";
1303 case P_IMPLY:
1304 return "imply";
1305 case P_RANGE:
1306 return "range";
1307 case P_SYMBOL:
1308 return "symbol";
1309 case P_UNKNOWN:
1310 break;
1311 }
1312 return "unknown";
1313}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
4 */
5
6#include <sys/types.h>
7#include <ctype.h>
8#include <stdlib.h>
9#include <string.h>
10#include <regex.h>
11
12#include "lkc.h"
13
14struct symbol symbol_yes = {
15 .name = "y",
16 .curr = { "y", yes },
17 .flags = SYMBOL_CONST|SYMBOL_VALID,
18};
19
20struct symbol symbol_mod = {
21 .name = "m",
22 .curr = { "m", mod },
23 .flags = SYMBOL_CONST|SYMBOL_VALID,
24};
25
26struct symbol symbol_no = {
27 .name = "n",
28 .curr = { "n", no },
29 .flags = SYMBOL_CONST|SYMBOL_VALID,
30};
31
32struct symbol *modules_sym;
33static tristate modules_val;
34static int sym_warnings;
35
36enum symbol_type sym_get_type(struct symbol *sym)
37{
38 enum symbol_type type = sym->type;
39
40 if (type == S_TRISTATE) {
41 if (sym_is_choice_value(sym) && sym->visible == yes)
42 type = S_BOOLEAN;
43 else if (modules_val == no)
44 type = S_BOOLEAN;
45 }
46 return type;
47}
48
49const char *sym_type_name(enum symbol_type type)
50{
51 switch (type) {
52 case S_BOOLEAN:
53 return "bool";
54 case S_TRISTATE:
55 return "tristate";
56 case S_INT:
57 return "integer";
58 case S_HEX:
59 return "hex";
60 case S_STRING:
61 return "string";
62 case S_UNKNOWN:
63 return "unknown";
64 }
65 return "???";
66}
67
68struct property *sym_get_choice_prop(struct symbol *sym)
69{
70 struct property *prop;
71
72 for_all_choices(sym, prop)
73 return prop;
74 return NULL;
75}
76
77static struct property *sym_get_default_prop(struct symbol *sym)
78{
79 struct property *prop;
80
81 for_all_defaults(sym, prop) {
82 prop->visible.tri = expr_calc_value(prop->visible.expr);
83 if (prop->visible.tri != no)
84 return prop;
85 }
86 return NULL;
87}
88
89struct property *sym_get_range_prop(struct symbol *sym)
90{
91 struct property *prop;
92
93 for_all_properties(sym, prop, P_RANGE) {
94 prop->visible.tri = expr_calc_value(prop->visible.expr);
95 if (prop->visible.tri != no)
96 return prop;
97 }
98 return NULL;
99}
100
101static long long sym_get_range_val(struct symbol *sym, int base)
102{
103 sym_calc_value(sym);
104 switch (sym->type) {
105 case S_INT:
106 base = 10;
107 break;
108 case S_HEX:
109 base = 16;
110 break;
111 default:
112 break;
113 }
114 return strtoll(sym->curr.val, NULL, base);
115}
116
117static void sym_validate_range(struct symbol *sym)
118{
119 struct property *prop;
120 struct symbol *range_sym;
121 int base;
122 long long val, val2;
123
124 switch (sym->type) {
125 case S_INT:
126 base = 10;
127 break;
128 case S_HEX:
129 base = 16;
130 break;
131 default:
132 return;
133 }
134 prop = sym_get_range_prop(sym);
135 if (!prop)
136 return;
137 val = strtoll(sym->curr.val, NULL, base);
138 range_sym = prop->expr->left.sym;
139 val2 = sym_get_range_val(range_sym, base);
140 if (val >= val2) {
141 range_sym = prop->expr->right.sym;
142 val2 = sym_get_range_val(range_sym, base);
143 if (val <= val2)
144 return;
145 }
146 sym->curr.val = range_sym->curr.val;
147}
148
149static void sym_set_changed(struct symbol *sym)
150{
151 struct property *prop;
152
153 sym->flags |= SYMBOL_CHANGED;
154 for (prop = sym->prop; prop; prop = prop->next) {
155 if (prop->menu)
156 prop->menu->flags |= MENU_CHANGED;
157 }
158}
159
160static void sym_set_all_changed(void)
161{
162 struct symbol *sym;
163 int i;
164
165 for_all_symbols(i, sym)
166 sym_set_changed(sym);
167}
168
169static void sym_calc_visibility(struct symbol *sym)
170{
171 struct property *prop;
172 struct symbol *choice_sym = NULL;
173 tristate tri;
174
175 /* any prompt visible? */
176 tri = no;
177
178 if (sym_is_choice_value(sym))
179 choice_sym = prop_get_symbol(sym_get_choice_prop(sym));
180
181 for_all_prompts(sym, prop) {
182 prop->visible.tri = expr_calc_value(prop->visible.expr);
183 /*
184 * Tristate choice_values with visibility 'mod' are
185 * not visible if the corresponding choice's value is
186 * 'yes'.
187 */
188 if (choice_sym && sym->type == S_TRISTATE &&
189 prop->visible.tri == mod && choice_sym->curr.tri == yes)
190 prop->visible.tri = no;
191
192 tri = EXPR_OR(tri, prop->visible.tri);
193 }
194 if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
195 tri = yes;
196 if (sym->visible != tri) {
197 sym->visible = tri;
198 sym_set_changed(sym);
199 }
200 if (sym_is_choice_value(sym))
201 return;
202 /* defaulting to "yes" if no explicit "depends on" are given */
203 tri = yes;
204 if (sym->dir_dep.expr)
205 tri = expr_calc_value(sym->dir_dep.expr);
206 if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
207 tri = yes;
208 if (sym->dir_dep.tri != tri) {
209 sym->dir_dep.tri = tri;
210 sym_set_changed(sym);
211 }
212 tri = no;
213 if (sym->rev_dep.expr)
214 tri = expr_calc_value(sym->rev_dep.expr);
215 if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
216 tri = yes;
217 if (sym->rev_dep.tri != tri) {
218 sym->rev_dep.tri = tri;
219 sym_set_changed(sym);
220 }
221 tri = no;
222 if (sym->implied.expr)
223 tri = expr_calc_value(sym->implied.expr);
224 if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
225 tri = yes;
226 if (sym->implied.tri != tri) {
227 sym->implied.tri = tri;
228 sym_set_changed(sym);
229 }
230}
231
232/*
233 * Find the default symbol for a choice.
234 * First try the default values for the choice symbol
235 * Next locate the first visible choice value
236 * Return NULL if none was found
237 */
238struct symbol *sym_choice_default(struct symbol *sym)
239{
240 struct symbol *def_sym;
241 struct property *prop;
242 struct expr *e;
243
244 /* any of the defaults visible? */
245 for_all_defaults(sym, prop) {
246 prop->visible.tri = expr_calc_value(prop->visible.expr);
247 if (prop->visible.tri == no)
248 continue;
249 def_sym = prop_get_symbol(prop);
250 if (def_sym->visible != no)
251 return def_sym;
252 }
253
254 /* just get the first visible value */
255 prop = sym_get_choice_prop(sym);
256 expr_list_for_each_sym(prop->expr, e, def_sym)
257 if (def_sym->visible != no)
258 return def_sym;
259
260 /* failed to locate any defaults */
261 return NULL;
262}
263
264static struct symbol *sym_calc_choice(struct symbol *sym)
265{
266 struct symbol *def_sym;
267 struct property *prop;
268 struct expr *e;
269 int flags;
270
271 /* first calculate all choice values' visibilities */
272 flags = sym->flags;
273 prop = sym_get_choice_prop(sym);
274 expr_list_for_each_sym(prop->expr, e, def_sym) {
275 sym_calc_visibility(def_sym);
276 if (def_sym->visible != no)
277 flags &= def_sym->flags;
278 }
279
280 sym->flags &= flags | ~SYMBOL_DEF_USER;
281
282 /* is the user choice visible? */
283 def_sym = sym->def[S_DEF_USER].val;
284 if (def_sym && def_sym->visible != no)
285 return def_sym;
286
287 def_sym = sym_choice_default(sym);
288
289 if (def_sym == NULL)
290 /* no choice? reset tristate value */
291 sym->curr.tri = no;
292
293 return def_sym;
294}
295
296static void sym_warn_unmet_dep(struct symbol *sym)
297{
298 struct gstr gs = str_new();
299
300 str_printf(&gs,
301 "\nWARNING: unmet direct dependencies detected for %s\n",
302 sym->name);
303 str_printf(&gs,
304 " Depends on [%c]: ",
305 sym->dir_dep.tri == mod ? 'm' : 'n');
306 expr_gstr_print(sym->dir_dep.expr, &gs);
307 str_printf(&gs, "\n");
308
309 expr_gstr_print_revdep(sym->rev_dep.expr, &gs, yes,
310 " Selected by [y]:\n");
311 expr_gstr_print_revdep(sym->rev_dep.expr, &gs, mod,
312 " Selected by [m]:\n");
313
314 fputs(str_get(&gs), stderr);
315 sym_warnings++;
316}
317
318bool sym_dep_errors(void)
319{
320 if (sym_warnings)
321 return getenv("KCONFIG_WERROR");
322 return false;
323}
324
325void sym_calc_value(struct symbol *sym)
326{
327 struct symbol_value newval, oldval;
328 struct property *prop;
329 struct expr *e;
330
331 if (!sym)
332 return;
333
334 if (sym->flags & SYMBOL_VALID)
335 return;
336
337 if (sym_is_choice_value(sym) &&
338 sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES) {
339 sym->flags &= ~SYMBOL_NEED_SET_CHOICE_VALUES;
340 prop = sym_get_choice_prop(sym);
341 sym_calc_value(prop_get_symbol(prop));
342 }
343
344 sym->flags |= SYMBOL_VALID;
345
346 oldval = sym->curr;
347
348 newval.tri = no;
349
350 switch (sym->type) {
351 case S_INT:
352 newval.val = "0";
353 break;
354 case S_HEX:
355 newval.val = "0x0";
356 break;
357 case S_STRING:
358 newval.val = "";
359 break;
360 case S_BOOLEAN:
361 case S_TRISTATE:
362 newval.val = "n";
363 break;
364 default:
365 sym->curr.val = sym->name;
366 sym->curr.tri = no;
367 return;
368 }
369 sym->flags &= ~SYMBOL_WRITE;
370
371 sym_calc_visibility(sym);
372
373 if (sym->visible != no)
374 sym->flags |= SYMBOL_WRITE;
375
376 /* set default if recursively called */
377 sym->curr = newval;
378
379 switch (sym_get_type(sym)) {
380 case S_BOOLEAN:
381 case S_TRISTATE:
382 if (sym_is_choice_value(sym) && sym->visible == yes) {
383 prop = sym_get_choice_prop(sym);
384 newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
385 } else {
386 if (sym->visible != no) {
387 /* if the symbol is visible use the user value
388 * if available, otherwise try the default value
389 */
390 if (sym_has_value(sym)) {
391 newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
392 sym->visible);
393 goto calc_newval;
394 }
395 }
396 if (sym->rev_dep.tri != no)
397 sym->flags |= SYMBOL_WRITE;
398 if (!sym_is_choice(sym)) {
399 prop = sym_get_default_prop(sym);
400 if (prop) {
401 newval.tri = EXPR_AND(expr_calc_value(prop->expr),
402 prop->visible.tri);
403 if (newval.tri != no)
404 sym->flags |= SYMBOL_WRITE;
405 }
406 if (sym->implied.tri != no) {
407 sym->flags |= SYMBOL_WRITE;
408 newval.tri = EXPR_OR(newval.tri, sym->implied.tri);
409 newval.tri = EXPR_AND(newval.tri,
410 sym->dir_dep.tri);
411 }
412 }
413 calc_newval:
414 if (sym->dir_dep.tri < sym->rev_dep.tri)
415 sym_warn_unmet_dep(sym);
416 newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
417 }
418 if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
419 newval.tri = yes;
420 break;
421 case S_STRING:
422 case S_HEX:
423 case S_INT:
424 if (sym->visible != no && sym_has_value(sym)) {
425 newval.val = sym->def[S_DEF_USER].val;
426 break;
427 }
428 prop = sym_get_default_prop(sym);
429 if (prop) {
430 struct symbol *ds = prop_get_symbol(prop);
431 if (ds) {
432 sym->flags |= SYMBOL_WRITE;
433 sym_calc_value(ds);
434 newval.val = ds->curr.val;
435 }
436 }
437 break;
438 default:
439 ;
440 }
441
442 sym->curr = newval;
443 if (sym_is_choice(sym) && newval.tri == yes)
444 sym->curr.val = sym_calc_choice(sym);
445 sym_validate_range(sym);
446
447 if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
448 sym_set_changed(sym);
449 if (modules_sym == sym) {
450 sym_set_all_changed();
451 modules_val = modules_sym->curr.tri;
452 }
453 }
454
455 if (sym_is_choice(sym)) {
456 struct symbol *choice_sym;
457
458 prop = sym_get_choice_prop(sym);
459 expr_list_for_each_sym(prop->expr, e, choice_sym) {
460 if ((sym->flags & SYMBOL_WRITE) &&
461 choice_sym->visible != no)
462 choice_sym->flags |= SYMBOL_WRITE;
463 if (sym->flags & SYMBOL_CHANGED)
464 sym_set_changed(choice_sym);
465 }
466 }
467
468 if (sym->flags & SYMBOL_NO_WRITE)
469 sym->flags &= ~SYMBOL_WRITE;
470
471 if (sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES)
472 set_all_choice_values(sym);
473}
474
475void sym_clear_all_valid(void)
476{
477 struct symbol *sym;
478 int i;
479
480 for_all_symbols(i, sym)
481 sym->flags &= ~SYMBOL_VALID;
482 conf_set_changed(true);
483 sym_calc_value(modules_sym);
484}
485
486bool sym_tristate_within_range(struct symbol *sym, tristate val)
487{
488 int type = sym_get_type(sym);
489
490 if (sym->visible == no)
491 return false;
492
493 if (type != S_BOOLEAN && type != S_TRISTATE)
494 return false;
495
496 if (type == S_BOOLEAN && val == mod)
497 return false;
498 if (sym->visible <= sym->rev_dep.tri)
499 return false;
500 if (sym_is_choice_value(sym) && sym->visible == yes)
501 return val == yes;
502 return val >= sym->rev_dep.tri && val <= sym->visible;
503}
504
505bool sym_set_tristate_value(struct symbol *sym, tristate val)
506{
507 tristate oldval = sym_get_tristate_value(sym);
508
509 if (oldval != val && !sym_tristate_within_range(sym, val))
510 return false;
511
512 if (!(sym->flags & SYMBOL_DEF_USER)) {
513 sym->flags |= SYMBOL_DEF_USER;
514 sym_set_changed(sym);
515 }
516 /*
517 * setting a choice value also resets the new flag of the choice
518 * symbol and all other choice values.
519 */
520 if (sym_is_choice_value(sym) && val == yes) {
521 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
522 struct property *prop;
523 struct expr *e;
524
525 cs->def[S_DEF_USER].val = sym;
526 cs->flags |= SYMBOL_DEF_USER;
527 prop = sym_get_choice_prop(cs);
528 for (e = prop->expr; e; e = e->left.expr) {
529 if (e->right.sym->visible != no)
530 e->right.sym->flags |= SYMBOL_DEF_USER;
531 }
532 }
533
534 sym->def[S_DEF_USER].tri = val;
535 if (oldval != val)
536 sym_clear_all_valid();
537
538 return true;
539}
540
541tristate sym_toggle_tristate_value(struct symbol *sym)
542{
543 tristate oldval, newval;
544
545 oldval = newval = sym_get_tristate_value(sym);
546 do {
547 switch (newval) {
548 case no:
549 newval = mod;
550 break;
551 case mod:
552 newval = yes;
553 break;
554 case yes:
555 newval = no;
556 break;
557 }
558 if (sym_set_tristate_value(sym, newval))
559 break;
560 } while (oldval != newval);
561 return newval;
562}
563
564bool sym_string_valid(struct symbol *sym, const char *str)
565{
566 signed char ch;
567
568 switch (sym->type) {
569 case S_STRING:
570 return true;
571 case S_INT:
572 ch = *str++;
573 if (ch == '-')
574 ch = *str++;
575 if (!isdigit(ch))
576 return false;
577 if (ch == '0' && *str != 0)
578 return false;
579 while ((ch = *str++)) {
580 if (!isdigit(ch))
581 return false;
582 }
583 return true;
584 case S_HEX:
585 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
586 str += 2;
587 ch = *str++;
588 do {
589 if (!isxdigit(ch))
590 return false;
591 } while ((ch = *str++));
592 return true;
593 case S_BOOLEAN:
594 case S_TRISTATE:
595 switch (str[0]) {
596 case 'y': case 'Y':
597 case 'm': case 'M':
598 case 'n': case 'N':
599 return true;
600 }
601 return false;
602 default:
603 return false;
604 }
605}
606
607bool sym_string_within_range(struct symbol *sym, const char *str)
608{
609 struct property *prop;
610 long long val;
611
612 switch (sym->type) {
613 case S_STRING:
614 return sym_string_valid(sym, str);
615 case S_INT:
616 if (!sym_string_valid(sym, str))
617 return false;
618 prop = sym_get_range_prop(sym);
619 if (!prop)
620 return true;
621 val = strtoll(str, NULL, 10);
622 return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
623 val <= sym_get_range_val(prop->expr->right.sym, 10);
624 case S_HEX:
625 if (!sym_string_valid(sym, str))
626 return false;
627 prop = sym_get_range_prop(sym);
628 if (!prop)
629 return true;
630 val = strtoll(str, NULL, 16);
631 return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
632 val <= sym_get_range_val(prop->expr->right.sym, 16);
633 case S_BOOLEAN:
634 case S_TRISTATE:
635 switch (str[0]) {
636 case 'y': case 'Y':
637 return sym_tristate_within_range(sym, yes);
638 case 'm': case 'M':
639 return sym_tristate_within_range(sym, mod);
640 case 'n': case 'N':
641 return sym_tristate_within_range(sym, no);
642 }
643 return false;
644 default:
645 return false;
646 }
647}
648
649bool sym_set_string_value(struct symbol *sym, const char *newval)
650{
651 const char *oldval;
652 char *val;
653 int size;
654
655 switch (sym->type) {
656 case S_BOOLEAN:
657 case S_TRISTATE:
658 switch (newval[0]) {
659 case 'y': case 'Y':
660 return sym_set_tristate_value(sym, yes);
661 case 'm': case 'M':
662 return sym_set_tristate_value(sym, mod);
663 case 'n': case 'N':
664 return sym_set_tristate_value(sym, no);
665 }
666 return false;
667 default:
668 ;
669 }
670
671 if (!sym_string_within_range(sym, newval))
672 return false;
673
674 if (!(sym->flags & SYMBOL_DEF_USER)) {
675 sym->flags |= SYMBOL_DEF_USER;
676 sym_set_changed(sym);
677 }
678
679 oldval = sym->def[S_DEF_USER].val;
680 size = strlen(newval) + 1;
681 if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
682 size += 2;
683 sym->def[S_DEF_USER].val = val = xmalloc(size);
684 *val++ = '0';
685 *val++ = 'x';
686 } else if (!oldval || strcmp(oldval, newval))
687 sym->def[S_DEF_USER].val = val = xmalloc(size);
688 else
689 return true;
690
691 strcpy(val, newval);
692 free((void *)oldval);
693 sym_clear_all_valid();
694
695 return true;
696}
697
698/*
699 * Find the default value associated to a symbol.
700 * For tristate symbol handle the modules=n case
701 * in which case "m" becomes "y".
702 * If the symbol does not have any default then fallback
703 * to the fixed default values.
704 */
705const char *sym_get_string_default(struct symbol *sym)
706{
707 struct property *prop;
708 struct symbol *ds;
709 const char *str = "";
710 tristate val;
711
712 sym_calc_visibility(sym);
713 sym_calc_value(modules_sym);
714 val = symbol_no.curr.tri;
715
716 /* If symbol has a default value look it up */
717 prop = sym_get_default_prop(sym);
718 if (prop != NULL) {
719 switch (sym->type) {
720 case S_BOOLEAN:
721 case S_TRISTATE:
722 /* The visibility may limit the value from yes => mod */
723 val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
724 break;
725 default:
726 /*
727 * The following fails to handle the situation
728 * where a default value is further limited by
729 * the valid range.
730 */
731 ds = prop_get_symbol(prop);
732 if (ds != NULL) {
733 sym_calc_value(ds);
734 str = (const char *)ds->curr.val;
735 }
736 }
737 }
738
739 /* Handle select statements */
740 val = EXPR_OR(val, sym->rev_dep.tri);
741
742 /* transpose mod to yes if modules are not enabled */
743 if (val == mod)
744 if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)
745 val = yes;
746
747 /* transpose mod to yes if type is bool */
748 if (sym->type == S_BOOLEAN && val == mod)
749 val = yes;
750
751 /* adjust the default value if this symbol is implied by another */
752 if (val < sym->implied.tri)
753 val = sym->implied.tri;
754
755 switch (sym->type) {
756 case S_BOOLEAN:
757 case S_TRISTATE:
758 switch (val) {
759 case no: return "n";
760 case mod: return "m";
761 case yes: return "y";
762 }
763 case S_INT:
764 if (!str[0])
765 str = "0";
766 break;
767 case S_HEX:
768 if (!str[0])
769 str = "0x0";
770 break;
771 default:
772 break;
773 }
774 return str;
775}
776
777const char *sym_get_string_value(struct symbol *sym)
778{
779 tristate val;
780
781 switch (sym->type) {
782 case S_BOOLEAN:
783 case S_TRISTATE:
784 val = sym_get_tristate_value(sym);
785 switch (val) {
786 case no:
787 return "n";
788 case mod:
789 sym_calc_value(modules_sym);
790 return (modules_sym->curr.tri == no) ? "n" : "m";
791 case yes:
792 return "y";
793 }
794 break;
795 default:
796 ;
797 }
798 return (const char *)sym->curr.val;
799}
800
801bool sym_is_changeable(struct symbol *sym)
802{
803 return sym->visible > sym->rev_dep.tri;
804}
805
806static unsigned strhash(const char *s)
807{
808 /* fnv32 hash */
809 unsigned hash = 2166136261U;
810 for (; *s; s++)
811 hash = (hash ^ *s) * 0x01000193;
812 return hash;
813}
814
815struct symbol *sym_lookup(const char *name, int flags)
816{
817 struct symbol *symbol;
818 char *new_name;
819 int hash;
820
821 if (name) {
822 if (name[0] && !name[1]) {
823 switch (name[0]) {
824 case 'y': return &symbol_yes;
825 case 'm': return &symbol_mod;
826 case 'n': return &symbol_no;
827 }
828 }
829 hash = strhash(name) % SYMBOL_HASHSIZE;
830
831 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
832 if (symbol->name &&
833 !strcmp(symbol->name, name) &&
834 (flags ? symbol->flags & flags
835 : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
836 return symbol;
837 }
838 new_name = xstrdup(name);
839 } else {
840 new_name = NULL;
841 hash = 0;
842 }
843
844 symbol = xmalloc(sizeof(*symbol));
845 memset(symbol, 0, sizeof(*symbol));
846 symbol->name = new_name;
847 symbol->type = S_UNKNOWN;
848 symbol->flags = flags;
849
850 symbol->next = symbol_hash[hash];
851 symbol_hash[hash] = symbol;
852
853 return symbol;
854}
855
856struct symbol *sym_find(const char *name)
857{
858 struct symbol *symbol = NULL;
859 int hash = 0;
860
861 if (!name)
862 return NULL;
863
864 if (name[0] && !name[1]) {
865 switch (name[0]) {
866 case 'y': return &symbol_yes;
867 case 'm': return &symbol_mod;
868 case 'n': return &symbol_no;
869 }
870 }
871 hash = strhash(name) % SYMBOL_HASHSIZE;
872
873 for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
874 if (symbol->name &&
875 !strcmp(symbol->name, name) &&
876 !(symbol->flags & SYMBOL_CONST))
877 break;
878 }
879
880 return symbol;
881}
882
883struct sym_match {
884 struct symbol *sym;
885 off_t so, eo;
886};
887
888/* Compare matched symbols as thus:
889 * - first, symbols that match exactly
890 * - then, alphabetical sort
891 */
892static int sym_rel_comp(const void *sym1, const void *sym2)
893{
894 const struct sym_match *s1 = sym1;
895 const struct sym_match *s2 = sym2;
896 int exact1, exact2;
897
898 /* Exact match:
899 * - if matched length on symbol s1 is the length of that symbol,
900 * then this symbol should come first;
901 * - if matched length on symbol s2 is the length of that symbol,
902 * then this symbol should come first.
903 * Note: since the search can be a regexp, both symbols may match
904 * exactly; if this is the case, we can't decide which comes first,
905 * and we fallback to sorting alphabetically.
906 */
907 exact1 = (s1->eo - s1->so) == strlen(s1->sym->name);
908 exact2 = (s2->eo - s2->so) == strlen(s2->sym->name);
909 if (exact1 && !exact2)
910 return -1;
911 if (!exact1 && exact2)
912 return 1;
913
914 /* As a fallback, sort symbols alphabetically */
915 return strcmp(s1->sym->name, s2->sym->name);
916}
917
918struct symbol **sym_re_search(const char *pattern)
919{
920 struct symbol *sym, **sym_arr = NULL;
921 struct sym_match *sym_match_arr = NULL;
922 int i, cnt, size;
923 regex_t re;
924 regmatch_t match[1];
925
926 cnt = size = 0;
927 /* Skip if empty */
928 if (strlen(pattern) == 0)
929 return NULL;
930 if (regcomp(&re, pattern, REG_EXTENDED|REG_ICASE))
931 return NULL;
932
933 for_all_symbols(i, sym) {
934 if (sym->flags & SYMBOL_CONST || !sym->name)
935 continue;
936 if (regexec(&re, sym->name, 1, match, 0))
937 continue;
938 if (cnt >= size) {
939 void *tmp;
940 size += 16;
941 tmp = realloc(sym_match_arr, size * sizeof(struct sym_match));
942 if (!tmp)
943 goto sym_re_search_free;
944 sym_match_arr = tmp;
945 }
946 sym_calc_value(sym);
947 /* As regexec returned 0, we know we have a match, so
948 * we can use match[0].rm_[se]o without further checks
949 */
950 sym_match_arr[cnt].so = match[0].rm_so;
951 sym_match_arr[cnt].eo = match[0].rm_eo;
952 sym_match_arr[cnt++].sym = sym;
953 }
954 if (sym_match_arr) {
955 qsort(sym_match_arr, cnt, sizeof(struct sym_match), sym_rel_comp);
956 sym_arr = malloc((cnt+1) * sizeof(struct symbol *));
957 if (!sym_arr)
958 goto sym_re_search_free;
959 for (i = 0; i < cnt; i++)
960 sym_arr[i] = sym_match_arr[i].sym;
961 sym_arr[cnt] = NULL;
962 }
963sym_re_search_free:
964 /* sym_match_arr can be NULL if no match, but free(NULL) is OK */
965 free(sym_match_arr);
966 regfree(&re);
967
968 return sym_arr;
969}
970
971/*
972 * When we check for recursive dependencies we use a stack to save
973 * current state so we can print out relevant info to user.
974 * The entries are located on the call stack so no need to free memory.
975 * Note insert() remove() must always match to properly clear the stack.
976 */
977static struct dep_stack {
978 struct dep_stack *prev, *next;
979 struct symbol *sym;
980 struct property *prop;
981 struct expr **expr;
982} *check_top;
983
984static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)
985{
986 memset(stack, 0, sizeof(*stack));
987 if (check_top)
988 check_top->next = stack;
989 stack->prev = check_top;
990 stack->sym = sym;
991 check_top = stack;
992}
993
994static void dep_stack_remove(void)
995{
996 check_top = check_top->prev;
997 if (check_top)
998 check_top->next = NULL;
999}
1000
1001/*
1002 * Called when we have detected a recursive dependency.
1003 * check_top point to the top of the stact so we use
1004 * the ->prev pointer to locate the bottom of the stack.
1005 */
1006static void sym_check_print_recursive(struct symbol *last_sym)
1007{
1008 struct dep_stack *stack;
1009 struct symbol *sym, *next_sym;
1010 struct menu *menu = NULL;
1011 struct property *prop;
1012 struct dep_stack cv_stack;
1013
1014 if (sym_is_choice_value(last_sym)) {
1015 dep_stack_insert(&cv_stack, last_sym);
1016 last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));
1017 }
1018
1019 for (stack = check_top; stack != NULL; stack = stack->prev)
1020 if (stack->sym == last_sym)
1021 break;
1022 if (!stack) {
1023 fprintf(stderr, "unexpected recursive dependency error\n");
1024 return;
1025 }
1026
1027 for (; stack; stack = stack->next) {
1028 sym = stack->sym;
1029 next_sym = stack->next ? stack->next->sym : last_sym;
1030 prop = stack->prop;
1031 if (prop == NULL)
1032 prop = stack->sym->prop;
1033
1034 /* for choice values find the menu entry (used below) */
1035 if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
1036 for (prop = sym->prop; prop; prop = prop->next) {
1037 menu = prop->menu;
1038 if (prop->menu)
1039 break;
1040 }
1041 }
1042 if (stack->sym == last_sym)
1043 fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
1044 prop->file->name, prop->lineno);
1045
1046 if (sym_is_choice(sym)) {
1047 fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n",
1048 menu->file->name, menu->lineno,
1049 sym->name ? sym->name : "<choice>",
1050 next_sym->name ? next_sym->name : "<choice>");
1051 } else if (sym_is_choice_value(sym)) {
1052 fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n",
1053 menu->file->name, menu->lineno,
1054 sym->name ? sym->name : "<choice>",
1055 next_sym->name ? next_sym->name : "<choice>");
1056 } else if (stack->expr == &sym->dir_dep.expr) {
1057 fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
1058 prop->file->name, prop->lineno,
1059 sym->name ? sym->name : "<choice>",
1060 next_sym->name ? next_sym->name : "<choice>");
1061 } else if (stack->expr == &sym->rev_dep.expr) {
1062 fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
1063 prop->file->name, prop->lineno,
1064 sym->name ? sym->name : "<choice>",
1065 next_sym->name ? next_sym->name : "<choice>");
1066 } else if (stack->expr == &sym->implied.expr) {
1067 fprintf(stderr, "%s:%d:\tsymbol %s is implied by %s\n",
1068 prop->file->name, prop->lineno,
1069 sym->name ? sym->name : "<choice>",
1070 next_sym->name ? next_sym->name : "<choice>");
1071 } else if (stack->expr) {
1072 fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
1073 prop->file->name, prop->lineno,
1074 sym->name ? sym->name : "<choice>",
1075 prop_get_type_name(prop->type),
1076 next_sym->name ? next_sym->name : "<choice>");
1077 } else {
1078 fprintf(stderr, "%s:%d:\tsymbol %s %s is visible depending on %s\n",
1079 prop->file->name, prop->lineno,
1080 sym->name ? sym->name : "<choice>",
1081 prop_get_type_name(prop->type),
1082 next_sym->name ? next_sym->name : "<choice>");
1083 }
1084 }
1085
1086 fprintf(stderr,
1087 "For a resolution refer to Documentation/kbuild/kconfig-language.rst\n"
1088 "subsection \"Kconfig recursive dependency limitations\"\n"
1089 "\n");
1090
1091 if (check_top == &cv_stack)
1092 dep_stack_remove();
1093}
1094
1095static struct symbol *sym_check_expr_deps(struct expr *e)
1096{
1097 struct symbol *sym;
1098
1099 if (!e)
1100 return NULL;
1101 switch (e->type) {
1102 case E_OR:
1103 case E_AND:
1104 sym = sym_check_expr_deps(e->left.expr);
1105 if (sym)
1106 return sym;
1107 return sym_check_expr_deps(e->right.expr);
1108 case E_NOT:
1109 return sym_check_expr_deps(e->left.expr);
1110 case E_EQUAL:
1111 case E_GEQ:
1112 case E_GTH:
1113 case E_LEQ:
1114 case E_LTH:
1115 case E_UNEQUAL:
1116 sym = sym_check_deps(e->left.sym);
1117 if (sym)
1118 return sym;
1119 return sym_check_deps(e->right.sym);
1120 case E_SYMBOL:
1121 return sym_check_deps(e->left.sym);
1122 default:
1123 break;
1124 }
1125 fprintf(stderr, "Oops! How to check %d?\n", e->type);
1126 return NULL;
1127}
1128
1129/* return NULL when dependencies are OK */
1130static struct symbol *sym_check_sym_deps(struct symbol *sym)
1131{
1132 struct symbol *sym2;
1133 struct property *prop;
1134 struct dep_stack stack;
1135
1136 dep_stack_insert(&stack, sym);
1137
1138 stack.expr = &sym->dir_dep.expr;
1139 sym2 = sym_check_expr_deps(sym->dir_dep.expr);
1140 if (sym2)
1141 goto out;
1142
1143 stack.expr = &sym->rev_dep.expr;
1144 sym2 = sym_check_expr_deps(sym->rev_dep.expr);
1145 if (sym2)
1146 goto out;
1147
1148 stack.expr = &sym->implied.expr;
1149 sym2 = sym_check_expr_deps(sym->implied.expr);
1150 if (sym2)
1151 goto out;
1152
1153 stack.expr = NULL;
1154
1155 for (prop = sym->prop; prop; prop = prop->next) {
1156 if (prop->type == P_CHOICE || prop->type == P_SELECT ||
1157 prop->type == P_IMPLY)
1158 continue;
1159 stack.prop = prop;
1160 sym2 = sym_check_expr_deps(prop->visible.expr);
1161 if (sym2)
1162 break;
1163 if (prop->type != P_DEFAULT || sym_is_choice(sym))
1164 continue;
1165 stack.expr = &prop->expr;
1166 sym2 = sym_check_expr_deps(prop->expr);
1167 if (sym2)
1168 break;
1169 stack.expr = NULL;
1170 }
1171
1172out:
1173 dep_stack_remove();
1174
1175 return sym2;
1176}
1177
1178static struct symbol *sym_check_choice_deps(struct symbol *choice)
1179{
1180 struct symbol *sym, *sym2;
1181 struct property *prop;
1182 struct expr *e;
1183 struct dep_stack stack;
1184
1185 dep_stack_insert(&stack, choice);
1186
1187 prop = sym_get_choice_prop(choice);
1188 expr_list_for_each_sym(prop->expr, e, sym)
1189 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1190
1191 choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1192 sym2 = sym_check_sym_deps(choice);
1193 choice->flags &= ~SYMBOL_CHECK;
1194 if (sym2)
1195 goto out;
1196
1197 expr_list_for_each_sym(prop->expr, e, sym) {
1198 sym2 = sym_check_sym_deps(sym);
1199 if (sym2)
1200 break;
1201 }
1202out:
1203 expr_list_for_each_sym(prop->expr, e, sym)
1204 sym->flags &= ~SYMBOL_CHECK;
1205
1206 if (sym2 && sym_is_choice_value(sym2) &&
1207 prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
1208 sym2 = choice;
1209
1210 dep_stack_remove();
1211
1212 return sym2;
1213}
1214
1215struct symbol *sym_check_deps(struct symbol *sym)
1216{
1217 struct symbol *sym2;
1218 struct property *prop;
1219
1220 if (sym->flags & SYMBOL_CHECK) {
1221 sym_check_print_recursive(sym);
1222 return sym;
1223 }
1224 if (sym->flags & SYMBOL_CHECKED)
1225 return NULL;
1226
1227 if (sym_is_choice_value(sym)) {
1228 struct dep_stack stack;
1229
1230 /* for choice groups start the check with main choice symbol */
1231 dep_stack_insert(&stack, sym);
1232 prop = sym_get_choice_prop(sym);
1233 sym2 = sym_check_deps(prop_get_symbol(prop));
1234 dep_stack_remove();
1235 } else if (sym_is_choice(sym)) {
1236 sym2 = sym_check_choice_deps(sym);
1237 } else {
1238 sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
1239 sym2 = sym_check_sym_deps(sym);
1240 sym->flags &= ~SYMBOL_CHECK;
1241 }
1242
1243 return sym2;
1244}
1245
1246struct symbol *prop_get_symbol(struct property *prop)
1247{
1248 if (prop->expr && (prop->expr->type == E_SYMBOL ||
1249 prop->expr->type == E_LIST))
1250 return prop->expr->left.sym;
1251 return NULL;
1252}
1253
1254const char *prop_get_type_name(enum prop_type type)
1255{
1256 switch (type) {
1257 case P_PROMPT:
1258 return "prompt";
1259 case P_COMMENT:
1260 return "comment";
1261 case P_MENU:
1262 return "menu";
1263 case P_DEFAULT:
1264 return "default";
1265 case P_CHOICE:
1266 return "choice";
1267 case P_SELECT:
1268 return "select";
1269 case P_IMPLY:
1270 return "imply";
1271 case P_RANGE:
1272 return "range";
1273 case P_SYMBOL:
1274 return "symbol";
1275 case P_UNKNOWN:
1276 break;
1277 }
1278 return "unknown";
1279}