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6de9cd9a | 1 | /* Array things |
ec378180 | 2 | Copyright (C) 2000, 2001, 2002, 2004, 2005 Free Software Foundation, Inc. |
6de9cd9a DN |
3 | Contributed by Andy Vaught |
4 | ||
9fc4d79b | 5 | This file is part of GCC. |
6de9cd9a | 6 | |
9fc4d79b TS |
7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
6de9cd9a | 11 | |
9fc4d79b TS |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
6de9cd9a DN |
16 | |
17 | You should have received a copy of the GNU General Public License | |
9fc4d79b | 18 | along with GCC; see the file COPYING. If not, write to the Free |
ab57747b KC |
19 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
20 | 02110-1301, USA. */ | |
6de9cd9a DN |
21 | |
22 | #include "config.h" | |
d22e4895 | 23 | #include "system.h" |
6de9cd9a DN |
24 | #include "gfortran.h" |
25 | #include "match.h" | |
26 | ||
6de9cd9a DN |
27 | /* This parameter is the size of the largest array constructor that we |
28 | will expand to an array constructor without iterators. | |
29 | Constructors larger than this will remain in the iterator form. */ | |
30 | ||
31 | #define GFC_MAX_AC_EXPAND 100 | |
32 | ||
33 | ||
34 | /**************** Array reference matching subroutines *****************/ | |
35 | ||
36 | /* Copy an array reference structure. */ | |
37 | ||
38 | gfc_array_ref * | |
39 | gfc_copy_array_ref (gfc_array_ref * src) | |
40 | { | |
41 | gfc_array_ref *dest; | |
42 | int i; | |
43 | ||
44 | if (src == NULL) | |
45 | return NULL; | |
46 | ||
47 | dest = gfc_get_array_ref (); | |
48 | ||
49 | *dest = *src; | |
50 | ||
51 | for (i = 0; i < GFC_MAX_DIMENSIONS; i++) | |
52 | { | |
53 | dest->start[i] = gfc_copy_expr (src->start[i]); | |
54 | dest->end[i] = gfc_copy_expr (src->end[i]); | |
55 | dest->stride[i] = gfc_copy_expr (src->stride[i]); | |
56 | } | |
57 | ||
58 | dest->offset = gfc_copy_expr (src->offset); | |
59 | ||
60 | return dest; | |
61 | } | |
62 | ||
63 | ||
64 | /* Match a single dimension of an array reference. This can be a | |
65 | single element or an array section. Any modifications we've made | |
66 | to the ar structure are cleaned up by the caller. If the init | |
67 | is set, we require the subscript to be a valid initialization | |
68 | expression. */ | |
69 | ||
70 | static match | |
71 | match_subscript (gfc_array_ref * ar, int init) | |
72 | { | |
73 | match m; | |
74 | int i; | |
75 | ||
76 | i = ar->dimen; | |
77 | ||
63645982 | 78 | ar->c_where[i] = gfc_current_locus; |
6de9cd9a DN |
79 | ar->start[i] = ar->end[i] = ar->stride[i] = NULL; |
80 | ||
81 | /* We can't be sure of the difference between DIMEN_ELEMENT and | |
82 | DIMEN_VECTOR until we know the type of the element itself at | |
83 | resolution time. */ | |
84 | ||
85 | ar->dimen_type[i] = DIMEN_UNKNOWN; | |
86 | ||
87 | if (gfc_match_char (':') == MATCH_YES) | |
88 | goto end_element; | |
89 | ||
90 | /* Get start element. */ | |
91 | if (init) | |
92 | m = gfc_match_init_expr (&ar->start[i]); | |
93 | else | |
94 | m = gfc_match_expr (&ar->start[i]); | |
95 | ||
96 | if (m == MATCH_NO) | |
97 | gfc_error ("Expected array subscript at %C"); | |
98 | if (m != MATCH_YES) | |
99 | return MATCH_ERROR; | |
100 | ||
101 | if (gfc_match_char (':') == MATCH_NO) | |
102 | return MATCH_YES; | |
103 | ||
104 | /* Get an optional end element. Because we've seen the colon, we | |
105 | definitely have a range along this dimension. */ | |
106 | end_element: | |
107 | ar->dimen_type[i] = DIMEN_RANGE; | |
108 | ||
109 | if (init) | |
110 | m = gfc_match_init_expr (&ar->end[i]); | |
111 | else | |
112 | m = gfc_match_expr (&ar->end[i]); | |
113 | ||
114 | if (m == MATCH_ERROR) | |
115 | return MATCH_ERROR; | |
116 | ||
117 | /* See if we have an optional stride. */ | |
118 | if (gfc_match_char (':') == MATCH_YES) | |
119 | { | |
120 | m = init ? gfc_match_init_expr (&ar->stride[i]) | |
121 | : gfc_match_expr (&ar->stride[i]); | |
122 | ||
123 | if (m == MATCH_NO) | |
124 | gfc_error ("Expected array subscript stride at %C"); | |
125 | if (m != MATCH_YES) | |
126 | return MATCH_ERROR; | |
127 | } | |
128 | ||
129 | return MATCH_YES; | |
130 | } | |
131 | ||
132 | ||
133 | /* Match an array reference, whether it is the whole array or a | |
134 | particular elements or a section. If init is set, the reference has | |
135 | to consist of init expressions. */ | |
136 | ||
137 | match | |
138 | gfc_match_array_ref (gfc_array_ref * ar, gfc_array_spec * as, int init) | |
139 | { | |
140 | match m; | |
141 | ||
142 | memset (ar, '\0', sizeof (ar)); | |
143 | ||
63645982 | 144 | ar->where = gfc_current_locus; |
6de9cd9a DN |
145 | ar->as = as; |
146 | ||
147 | if (gfc_match_char ('(') != MATCH_YES) | |
148 | { | |
149 | ar->type = AR_FULL; | |
150 | ar->dimen = 0; | |
151 | return MATCH_YES; | |
152 | } | |
153 | ||
154 | ar->type = AR_UNKNOWN; | |
155 | ||
156 | for (ar->dimen = 0; ar->dimen < GFC_MAX_DIMENSIONS; ar->dimen++) | |
157 | { | |
158 | m = match_subscript (ar, init); | |
159 | if (m == MATCH_ERROR) | |
160 | goto error; | |
161 | ||
162 | if (gfc_match_char (')') == MATCH_YES) | |
163 | goto matched; | |
164 | ||
165 | if (gfc_match_char (',') != MATCH_YES) | |
166 | { | |
167 | gfc_error ("Invalid form of array reference at %C"); | |
168 | goto error; | |
169 | } | |
170 | } | |
171 | ||
172 | gfc_error ("Array reference at %C cannot have more than " | |
173 | stringize (GFC_MAX_DIMENSIONS) " dimensions"); | |
174 | ||
175 | error: | |
176 | return MATCH_ERROR; | |
177 | ||
178 | matched: | |
179 | ar->dimen++; | |
180 | ||
181 | return MATCH_YES; | |
182 | } | |
183 | ||
184 | ||
185 | /************** Array specification matching subroutines ***************/ | |
186 | ||
187 | /* Free all of the expressions associated with array bounds | |
188 | specifications. */ | |
189 | ||
190 | void | |
191 | gfc_free_array_spec (gfc_array_spec * as) | |
192 | { | |
193 | int i; | |
194 | ||
195 | if (as == NULL) | |
196 | return; | |
197 | ||
198 | for (i = 0; i < as->rank; i++) | |
199 | { | |
200 | gfc_free_expr (as->lower[i]); | |
201 | gfc_free_expr (as->upper[i]); | |
202 | } | |
203 | ||
204 | gfc_free (as); | |
205 | } | |
206 | ||
207 | ||
208 | /* Take an array bound, resolves the expression, that make up the | |
209 | shape and check associated constraints. */ | |
210 | ||
211 | static try | |
212 | resolve_array_bound (gfc_expr * e, int check_constant) | |
213 | { | |
214 | ||
215 | if (e == NULL) | |
216 | return SUCCESS; | |
217 | ||
218 | if (gfc_resolve_expr (e) == FAILURE | |
219 | || gfc_specification_expr (e) == FAILURE) | |
220 | return FAILURE; | |
221 | ||
222 | if (check_constant && gfc_is_constant_expr (e) == 0) | |
223 | { | |
224 | gfc_error ("Variable '%s' at %L in this context must be constant", | |
225 | e->symtree->n.sym->name, &e->where); | |
226 | return FAILURE; | |
227 | } | |
228 | ||
229 | return SUCCESS; | |
230 | } | |
231 | ||
232 | ||
233 | /* Takes an array specification, resolves the expressions that make up | |
234 | the shape and make sure everything is integral. */ | |
235 | ||
236 | try | |
237 | gfc_resolve_array_spec (gfc_array_spec * as, int check_constant) | |
238 | { | |
239 | gfc_expr *e; | |
240 | int i; | |
241 | ||
242 | if (as == NULL) | |
243 | return SUCCESS; | |
244 | ||
245 | for (i = 0; i < as->rank; i++) | |
246 | { | |
247 | e = as->lower[i]; | |
248 | if (resolve_array_bound (e, check_constant) == FAILURE) | |
249 | return FAILURE; | |
250 | ||
251 | e = as->upper[i]; | |
252 | if (resolve_array_bound (e, check_constant) == FAILURE) | |
253 | return FAILURE; | |
254 | } | |
255 | ||
256 | return SUCCESS; | |
257 | } | |
258 | ||
259 | ||
260 | /* Match a single array element specification. The return values as | |
261 | well as the upper and lower bounds of the array spec are filled | |
262 | in according to what we see on the input. The caller makes sure | |
263 | individual specifications make sense as a whole. | |
264 | ||
265 | ||
266 | Parsed Lower Upper Returned | |
267 | ------------------------------------ | |
268 | : NULL NULL AS_DEFERRED (*) | |
269 | x 1 x AS_EXPLICIT | |
270 | x: x NULL AS_ASSUMED_SHAPE | |
271 | x:y x y AS_EXPLICIT | |
272 | x:* x NULL AS_ASSUMED_SIZE | |
273 | * 1 NULL AS_ASSUMED_SIZE | |
274 | ||
275 | (*) For non-pointer dummy arrays this is AS_ASSUMED_SHAPE. This | |
276 | is fixed during the resolution of formal interfaces. | |
277 | ||
278 | Anything else AS_UNKNOWN. */ | |
279 | ||
280 | static array_type | |
281 | match_array_element_spec (gfc_array_spec * as) | |
282 | { | |
283 | gfc_expr **upper, **lower; | |
284 | match m; | |
285 | ||
286 | lower = &as->lower[as->rank - 1]; | |
287 | upper = &as->upper[as->rank - 1]; | |
288 | ||
289 | if (gfc_match_char ('*') == MATCH_YES) | |
290 | { | |
291 | *lower = gfc_int_expr (1); | |
292 | return AS_ASSUMED_SIZE; | |
293 | } | |
294 | ||
295 | if (gfc_match_char (':') == MATCH_YES) | |
296 | return AS_DEFERRED; | |
297 | ||
298 | m = gfc_match_expr (upper); | |
299 | if (m == MATCH_NO) | |
300 | gfc_error ("Expected expression in array specification at %C"); | |
301 | if (m != MATCH_YES) | |
302 | return AS_UNKNOWN; | |
303 | ||
304 | if (gfc_match_char (':') == MATCH_NO) | |
305 | { | |
306 | *lower = gfc_int_expr (1); | |
307 | return AS_EXPLICIT; | |
308 | } | |
309 | ||
310 | *lower = *upper; | |
311 | *upper = NULL; | |
312 | ||
313 | if (gfc_match_char ('*') == MATCH_YES) | |
314 | return AS_ASSUMED_SIZE; | |
315 | ||
316 | m = gfc_match_expr (upper); | |
317 | if (m == MATCH_ERROR) | |
318 | return AS_UNKNOWN; | |
319 | if (m == MATCH_NO) | |
320 | return AS_ASSUMED_SHAPE; | |
321 | ||
322 | return AS_EXPLICIT; | |
323 | } | |
324 | ||
325 | ||
326 | /* Matches an array specification, incidentally figuring out what sort | |
327 | it is. */ | |
328 | ||
329 | match | |
330 | gfc_match_array_spec (gfc_array_spec ** asp) | |
331 | { | |
332 | array_type current_type; | |
333 | gfc_array_spec *as; | |
334 | int i; | |
335 | ||
336 | if (gfc_match_char ('(') != MATCH_YES) | |
337 | { | |
338 | *asp = NULL; | |
339 | return MATCH_NO; | |
340 | } | |
341 | ||
342 | as = gfc_get_array_spec (); | |
343 | ||
344 | for (i = 0; i < GFC_MAX_DIMENSIONS; i++) | |
345 | { | |
346 | as->lower[i] = NULL; | |
347 | as->upper[i] = NULL; | |
348 | } | |
349 | ||
350 | as->rank = 1; | |
351 | ||
352 | for (;;) | |
353 | { | |
354 | current_type = match_array_element_spec (as); | |
355 | ||
356 | if (as->rank == 1) | |
357 | { | |
358 | if (current_type == AS_UNKNOWN) | |
359 | goto cleanup; | |
360 | as->type = current_type; | |
361 | } | |
362 | else | |
363 | switch (as->type) | |
364 | { /* See how current spec meshes with the existing */ | |
365 | case AS_UNKNOWN: | |
366 | goto cleanup; | |
367 | ||
368 | case AS_EXPLICIT: | |
369 | if (current_type == AS_ASSUMED_SIZE) | |
370 | { | |
371 | as->type = AS_ASSUMED_SIZE; | |
372 | break; | |
373 | } | |
374 | ||
375 | if (current_type == AS_EXPLICIT) | |
376 | break; | |
377 | ||
378 | gfc_error | |
379 | ("Bad array specification for an explicitly shaped array" | |
380 | " at %C"); | |
381 | ||
382 | goto cleanup; | |
383 | ||
384 | case AS_ASSUMED_SHAPE: | |
385 | if ((current_type == AS_ASSUMED_SHAPE) | |
386 | || (current_type == AS_DEFERRED)) | |
387 | break; | |
388 | ||
389 | gfc_error | |
390 | ("Bad array specification for assumed shape array at %C"); | |
391 | goto cleanup; | |
392 | ||
393 | case AS_DEFERRED: | |
394 | if (current_type == AS_DEFERRED) | |
395 | break; | |
396 | ||
397 | if (current_type == AS_ASSUMED_SHAPE) | |
398 | { | |
399 | as->type = AS_ASSUMED_SHAPE; | |
400 | break; | |
401 | } | |
402 | ||
403 | gfc_error ("Bad specification for deferred shape array at %C"); | |
404 | goto cleanup; | |
405 | ||
406 | case AS_ASSUMED_SIZE: | |
407 | gfc_error ("Bad specification for assumed size array at %C"); | |
408 | goto cleanup; | |
409 | } | |
410 | ||
411 | if (gfc_match_char (')') == MATCH_YES) | |
412 | break; | |
413 | ||
414 | if (gfc_match_char (',') != MATCH_YES) | |
415 | { | |
416 | gfc_error ("Expected another dimension in array declaration at %C"); | |
417 | goto cleanup; | |
418 | } | |
419 | ||
420 | if (as->rank >= GFC_MAX_DIMENSIONS) | |
421 | { | |
422 | gfc_error ("Array specification at %C has more than " | |
423 | stringize (GFC_MAX_DIMENSIONS) " dimensions"); | |
424 | goto cleanup; | |
425 | } | |
426 | ||
427 | as->rank++; | |
428 | } | |
429 | ||
430 | /* If a lower bounds of an assumed shape array is blank, put in one. */ | |
431 | if (as->type == AS_ASSUMED_SHAPE) | |
432 | { | |
433 | for (i = 0; i < as->rank; i++) | |
434 | { | |
435 | if (as->lower[i] == NULL) | |
436 | as->lower[i] = gfc_int_expr (1); | |
437 | } | |
438 | } | |
439 | *asp = as; | |
440 | return MATCH_YES; | |
441 | ||
442 | cleanup: | |
443 | /* Something went wrong. */ | |
444 | gfc_free_array_spec (as); | |
445 | return MATCH_ERROR; | |
446 | } | |
447 | ||
448 | ||
449 | /* Given a symbol and an array specification, modify the symbol to | |
450 | have that array specification. The error locus is needed in case | |
451 | something goes wrong. On failure, the caller must free the spec. */ | |
452 | ||
453 | try | |
454 | gfc_set_array_spec (gfc_symbol * sym, gfc_array_spec * as, locus * error_loc) | |
455 | { | |
456 | ||
457 | if (as == NULL) | |
458 | return SUCCESS; | |
459 | ||
231b2fcc | 460 | if (gfc_add_dimension (&sym->attr, sym->name, error_loc) == FAILURE) |
6de9cd9a DN |
461 | return FAILURE; |
462 | ||
463 | sym->as = as; | |
464 | ||
465 | return SUCCESS; | |
466 | } | |
467 | ||
468 | ||
469 | /* Copy an array specification. */ | |
470 | ||
471 | gfc_array_spec * | |
472 | gfc_copy_array_spec (gfc_array_spec * src) | |
473 | { | |
474 | gfc_array_spec *dest; | |
475 | int i; | |
476 | ||
477 | if (src == NULL) | |
478 | return NULL; | |
479 | ||
480 | dest = gfc_get_array_spec (); | |
481 | ||
482 | *dest = *src; | |
483 | ||
484 | for (i = 0; i < dest->rank; i++) | |
485 | { | |
486 | dest->lower[i] = gfc_copy_expr (dest->lower[i]); | |
487 | dest->upper[i] = gfc_copy_expr (dest->upper[i]); | |
488 | } | |
489 | ||
490 | return dest; | |
491 | } | |
492 | ||
493 | /* Returns nonzero if the two expressions are equal. Only handles integer | |
494 | constants. */ | |
495 | ||
496 | static int | |
497 | compare_bounds (gfc_expr * bound1, gfc_expr * bound2) | |
498 | { | |
499 | if (bound1 == NULL || bound2 == NULL | |
500 | || bound1->expr_type != EXPR_CONSTANT | |
501 | || bound2->expr_type != EXPR_CONSTANT | |
502 | || bound1->ts.type != BT_INTEGER | |
503 | || bound2->ts.type != BT_INTEGER) | |
504 | gfc_internal_error ("gfc_compare_array_spec(): Array spec clobbered"); | |
505 | ||
506 | if (mpz_cmp (bound1->value.integer, bound2->value.integer) == 0) | |
507 | return 1; | |
508 | else | |
509 | return 0; | |
510 | } | |
511 | ||
512 | /* Compares two array specifications. They must be constant or deferred | |
513 | shape. */ | |
514 | ||
515 | int | |
516 | gfc_compare_array_spec (gfc_array_spec * as1, gfc_array_spec * as2) | |
517 | { | |
518 | int i; | |
519 | ||
520 | if (as1 == NULL && as2 == NULL) | |
521 | return 1; | |
522 | ||
523 | if (as1 == NULL || as2 == NULL) | |
524 | return 0; | |
525 | ||
526 | if (as1->rank != as2->rank) | |
527 | return 0; | |
528 | ||
529 | if (as1->rank == 0) | |
530 | return 1; | |
531 | ||
532 | if (as1->type != as2->type) | |
533 | return 0; | |
534 | ||
535 | if (as1->type == AS_EXPLICIT) | |
536 | for (i = 0; i < as1->rank; i++) | |
537 | { | |
538 | if (compare_bounds (as1->lower[i], as2->lower[i]) == 0) | |
539 | return 0; | |
540 | ||
541 | if (compare_bounds (as1->upper[i], as2->upper[i]) == 0) | |
542 | return 0; | |
543 | } | |
544 | ||
545 | return 1; | |
546 | } | |
547 | ||
548 | ||
549 | /****************** Array constructor functions ******************/ | |
550 | ||
551 | /* Start an array constructor. The constructor starts with zero | |
552 | elements and should be appended to by gfc_append_constructor(). */ | |
553 | ||
554 | gfc_expr * | |
555 | gfc_start_constructor (bt type, int kind, locus * where) | |
556 | { | |
557 | gfc_expr *result; | |
558 | ||
559 | result = gfc_get_expr (); | |
560 | ||
561 | result->expr_type = EXPR_ARRAY; | |
562 | result->rank = 1; | |
563 | ||
564 | result->ts.type = type; | |
565 | result->ts.kind = kind; | |
566 | result->where = *where; | |
567 | return result; | |
568 | } | |
569 | ||
570 | ||
571 | /* Given an array constructor expression, append the new expression | |
572 | node onto the constructor. */ | |
573 | ||
574 | void | |
575 | gfc_append_constructor (gfc_expr * base, gfc_expr * new) | |
576 | { | |
577 | gfc_constructor *c; | |
578 | ||
579 | if (base->value.constructor == NULL) | |
580 | base->value.constructor = c = gfc_get_constructor (); | |
581 | else | |
582 | { | |
583 | c = base->value.constructor; | |
584 | while (c->next) | |
585 | c = c->next; | |
586 | ||
587 | c->next = gfc_get_constructor (); | |
588 | c = c->next; | |
589 | } | |
590 | ||
591 | c->expr = new; | |
592 | ||
593 | if (new->ts.type != base->ts.type || new->ts.kind != base->ts.kind) | |
594 | gfc_internal_error ("gfc_append_constructor(): New node has wrong kind"); | |
595 | } | |
596 | ||
597 | ||
598 | /* Given an array constructor expression, insert the new expression's | |
599 | constructor onto the base's one according to the offset. */ | |
600 | ||
601 | void | |
602 | gfc_insert_constructor (gfc_expr * base, gfc_constructor * c1) | |
603 | { | |
604 | gfc_constructor *c, *pre; | |
605 | expr_t type; | |
da4f9e3b | 606 | int t; |
6de9cd9a DN |
607 | |
608 | type = base->expr_type; | |
609 | ||
610 | if (base->value.constructor == NULL) | |
611 | base->value.constructor = c1; | |
612 | else | |
613 | { | |
614 | c = pre = base->value.constructor; | |
615 | while (c) | |
616 | { | |
617 | if (type == EXPR_ARRAY) | |
618 | { | |
da4f9e3b TS |
619 | t = mpz_cmp (c->n.offset, c1->n.offset); |
620 | if (t < 0) | |
6de9cd9a DN |
621 | { |
622 | pre = c; | |
623 | c = c->next; | |
624 | } | |
da4f9e3b | 625 | else if (t == 0) |
6de9cd9a DN |
626 | { |
627 | gfc_error ("duplicated initializer"); | |
628 | break; | |
629 | } | |
630 | else | |
631 | break; | |
632 | } | |
633 | else | |
634 | { | |
635 | pre = c; | |
636 | c = c->next; | |
637 | } | |
638 | } | |
639 | ||
640 | if (pre != c) | |
641 | { | |
642 | pre->next = c1; | |
643 | c1->next = c; | |
644 | } | |
645 | else | |
646 | { | |
647 | c1->next = c; | |
648 | base->value.constructor = c1; | |
649 | } | |
650 | } | |
651 | } | |
652 | ||
653 | ||
654 | /* Get a new constructor. */ | |
655 | ||
656 | gfc_constructor * | |
657 | gfc_get_constructor (void) | |
658 | { | |
659 | gfc_constructor *c; | |
660 | ||
661 | c = gfc_getmem (sizeof(gfc_constructor)); | |
662 | c->expr = NULL; | |
663 | c->iterator = NULL; | |
664 | c->next = NULL; | |
665 | mpz_init_set_si (c->n.offset, 0); | |
666 | mpz_init_set_si (c->repeat, 0); | |
667 | return c; | |
668 | } | |
669 | ||
670 | ||
671 | /* Free chains of gfc_constructor structures. */ | |
672 | ||
673 | void | |
674 | gfc_free_constructor (gfc_constructor * p) | |
675 | { | |
676 | gfc_constructor *next; | |
677 | ||
678 | if (p == NULL) | |
679 | return; | |
680 | ||
681 | for (; p; p = next) | |
682 | { | |
683 | next = p->next; | |
684 | ||
685 | if (p->expr) | |
686 | gfc_free_expr (p->expr); | |
687 | if (p->iterator != NULL) | |
688 | gfc_free_iterator (p->iterator, 1); | |
689 | mpz_clear (p->n.offset); | |
690 | mpz_clear (p->repeat); | |
691 | gfc_free (p); | |
692 | } | |
693 | } | |
694 | ||
695 | ||
696 | /* Given an expression node that might be an array constructor and a | |
697 | symbol, make sure that no iterators in this or child constructors | |
698 | use the symbol as an implied-DO iterator. Returns nonzero if a | |
699 | duplicate was found. */ | |
700 | ||
701 | static int | |
702 | check_duplicate_iterator (gfc_constructor * c, gfc_symbol * master) | |
703 | { | |
704 | gfc_expr *e; | |
705 | ||
706 | for (; c; c = c->next) | |
707 | { | |
708 | e = c->expr; | |
709 | ||
710 | if (e->expr_type == EXPR_ARRAY | |
711 | && check_duplicate_iterator (e->value.constructor, master)) | |
712 | return 1; | |
713 | ||
714 | if (c->iterator == NULL) | |
715 | continue; | |
716 | ||
717 | if (c->iterator->var->symtree->n.sym == master) | |
718 | { | |
719 | gfc_error | |
720 | ("DO-iterator '%s' at %L is inside iterator of the same name", | |
721 | master->name, &c->where); | |
722 | ||
723 | return 1; | |
724 | } | |
725 | } | |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
730 | ||
731 | /* Forward declaration because these functions are mutually recursive. */ | |
732 | static match match_array_cons_element (gfc_constructor **); | |
733 | ||
734 | /* Match a list of array elements. */ | |
735 | ||
736 | static match | |
737 | match_array_list (gfc_constructor ** result) | |
738 | { | |
739 | gfc_constructor *p, *head, *tail, *new; | |
740 | gfc_iterator iter; | |
741 | locus old_loc; | |
742 | gfc_expr *e; | |
743 | match m; | |
744 | int n; | |
745 | ||
63645982 | 746 | old_loc = gfc_current_locus; |
6de9cd9a DN |
747 | |
748 | if (gfc_match_char ('(') == MATCH_NO) | |
749 | return MATCH_NO; | |
750 | ||
751 | memset (&iter, '\0', sizeof (gfc_iterator)); | |
752 | head = NULL; | |
753 | ||
754 | m = match_array_cons_element (&head); | |
755 | if (m != MATCH_YES) | |
756 | goto cleanup; | |
757 | ||
758 | tail = head; | |
759 | ||
760 | if (gfc_match_char (',') != MATCH_YES) | |
761 | { | |
762 | m = MATCH_NO; | |
763 | goto cleanup; | |
764 | } | |
765 | ||
766 | for (n = 1;; n++) | |
767 | { | |
768 | m = gfc_match_iterator (&iter, 0); | |
769 | if (m == MATCH_YES) | |
770 | break; | |
771 | if (m == MATCH_ERROR) | |
772 | goto cleanup; | |
773 | ||
774 | m = match_array_cons_element (&new); | |
775 | if (m == MATCH_ERROR) | |
776 | goto cleanup; | |
777 | if (m == MATCH_NO) | |
778 | { | |
779 | if (n > 2) | |
780 | goto syntax; | |
781 | m = MATCH_NO; | |
782 | goto cleanup; /* Could be a complex constant */ | |
783 | } | |
784 | ||
785 | tail->next = new; | |
786 | tail = new; | |
787 | ||
788 | if (gfc_match_char (',') != MATCH_YES) | |
789 | { | |
790 | if (n > 2) | |
791 | goto syntax; | |
792 | m = MATCH_NO; | |
793 | goto cleanup; | |
794 | } | |
795 | } | |
796 | ||
797 | if (gfc_match_char (')') != MATCH_YES) | |
798 | goto syntax; | |
799 | ||
800 | if (check_duplicate_iterator (head, iter.var->symtree->n.sym)) | |
801 | { | |
802 | m = MATCH_ERROR; | |
803 | goto cleanup; | |
804 | } | |
805 | ||
806 | e = gfc_get_expr (); | |
807 | e->expr_type = EXPR_ARRAY; | |
808 | e->where = old_loc; | |
809 | e->value.constructor = head; | |
810 | ||
811 | p = gfc_get_constructor (); | |
63645982 | 812 | p->where = gfc_current_locus; |
6de9cd9a DN |
813 | p->iterator = gfc_get_iterator (); |
814 | *p->iterator = iter; | |
815 | ||
816 | p->expr = e; | |
817 | *result = p; | |
818 | ||
819 | return MATCH_YES; | |
820 | ||
821 | syntax: | |
822 | gfc_error ("Syntax error in array constructor at %C"); | |
823 | m = MATCH_ERROR; | |
824 | ||
825 | cleanup: | |
826 | gfc_free_constructor (head); | |
827 | gfc_free_iterator (&iter, 0); | |
63645982 | 828 | gfc_current_locus = old_loc; |
6de9cd9a DN |
829 | return m; |
830 | } | |
831 | ||
832 | ||
833 | /* Match a single element of an array constructor, which can be a | |
834 | single expression or a list of elements. */ | |
835 | ||
836 | static match | |
837 | match_array_cons_element (gfc_constructor ** result) | |
838 | { | |
839 | gfc_constructor *p; | |
840 | gfc_expr *expr; | |
841 | match m; | |
842 | ||
843 | m = match_array_list (result); | |
844 | if (m != MATCH_NO) | |
845 | return m; | |
846 | ||
847 | m = gfc_match_expr (&expr); | |
848 | if (m != MATCH_YES) | |
849 | return m; | |
850 | ||
851 | p = gfc_get_constructor (); | |
63645982 | 852 | p->where = gfc_current_locus; |
6de9cd9a DN |
853 | p->expr = expr; |
854 | ||
855 | *result = p; | |
856 | return MATCH_YES; | |
857 | } | |
858 | ||
859 | ||
860 | /* Match an array constructor. */ | |
861 | ||
862 | match | |
863 | gfc_match_array_constructor (gfc_expr ** result) | |
864 | { | |
865 | gfc_constructor *head, *tail, *new; | |
866 | gfc_expr *expr; | |
867 | locus where; | |
868 | match m; | |
acc75ae3 | 869 | const char *end_delim; |
6de9cd9a DN |
870 | |
871 | if (gfc_match (" (/") == MATCH_NO) | |
acc75ae3 EE |
872 | { |
873 | if (gfc_match (" [") == MATCH_NO) | |
874 | return MATCH_NO; | |
875 | else | |
876 | { | |
877 | if (gfc_notify_std (GFC_STD_F2003, "New in Fortran 2003: [...] " | |
878 | "style array constructors at %C") == FAILURE) | |
879 | return MATCH_ERROR; | |
880 | end_delim = " ]"; | |
881 | } | |
882 | } | |
883 | else | |
884 | end_delim = " /)"; | |
6de9cd9a | 885 | |
63645982 | 886 | where = gfc_current_locus; |
6de9cd9a DN |
887 | head = tail = NULL; |
888 | ||
acc75ae3 | 889 | if (gfc_match (end_delim) == MATCH_YES) |
ab21e272 TS |
890 | { |
891 | gfc_error ("Empty array constructor at %C is not allowed"); | |
892 | goto cleanup; | |
893 | } | |
6de9cd9a DN |
894 | |
895 | for (;;) | |
896 | { | |
897 | m = match_array_cons_element (&new); | |
898 | if (m == MATCH_ERROR) | |
899 | goto cleanup; | |
900 | if (m == MATCH_NO) | |
901 | goto syntax; | |
902 | ||
903 | if (head == NULL) | |
904 | head = new; | |
905 | else | |
906 | tail->next = new; | |
907 | ||
908 | tail = new; | |
909 | ||
910 | if (gfc_match_char (',') == MATCH_NO) | |
911 | break; | |
912 | } | |
913 | ||
acc75ae3 | 914 | if (gfc_match (end_delim) == MATCH_NO) |
6de9cd9a DN |
915 | goto syntax; |
916 | ||
6de9cd9a DN |
917 | expr = gfc_get_expr (); |
918 | ||
919 | expr->expr_type = EXPR_ARRAY; | |
920 | ||
921 | expr->value.constructor = head; | |
922 | /* Size must be calculated at resolution time. */ | |
923 | ||
924 | expr->where = where; | |
925 | expr->rank = 1; | |
926 | ||
927 | *result = expr; | |
928 | return MATCH_YES; | |
929 | ||
930 | syntax: | |
931 | gfc_error ("Syntax error in array constructor at %C"); | |
932 | ||
933 | cleanup: | |
934 | gfc_free_constructor (head); | |
935 | return MATCH_ERROR; | |
936 | } | |
937 | ||
938 | ||
939 | ||
940 | /************** Check array constructors for correctness **************/ | |
941 | ||
942 | /* Given an expression, compare it's type with the type of the current | |
943 | constructor. Returns nonzero if an error was issued. The | |
944 | cons_state variable keeps track of whether the type of the | |
945 | constructor being read or resolved is known to be good, bad or just | |
946 | starting out. */ | |
947 | ||
948 | static gfc_typespec constructor_ts; | |
949 | static enum | |
950 | { CONS_START, CONS_GOOD, CONS_BAD } | |
951 | cons_state; | |
952 | ||
953 | static int | |
954 | check_element_type (gfc_expr * expr) | |
955 | { | |
956 | ||
957 | if (cons_state == CONS_BAD) | |
1f2959f0 | 958 | return 0; /* Suppress further errors */ |
6de9cd9a DN |
959 | |
960 | if (cons_state == CONS_START) | |
961 | { | |
962 | if (expr->ts.type == BT_UNKNOWN) | |
963 | cons_state = CONS_BAD; | |
964 | else | |
965 | { | |
966 | cons_state = CONS_GOOD; | |
967 | constructor_ts = expr->ts; | |
968 | } | |
969 | ||
970 | return 0; | |
971 | } | |
972 | ||
973 | if (gfc_compare_types (&constructor_ts, &expr->ts)) | |
974 | return 0; | |
975 | ||
976 | gfc_error ("Element in %s array constructor at %L is %s", | |
977 | gfc_typename (&constructor_ts), &expr->where, | |
978 | gfc_typename (&expr->ts)); | |
979 | ||
980 | cons_state = CONS_BAD; | |
981 | return 1; | |
982 | } | |
983 | ||
984 | ||
f7b529fa | 985 | /* Recursive work function for gfc_check_constructor_type(). */ |
6de9cd9a DN |
986 | |
987 | static try | |
988 | check_constructor_type (gfc_constructor * c) | |
989 | { | |
990 | gfc_expr *e; | |
991 | ||
992 | for (; c; c = c->next) | |
993 | { | |
994 | e = c->expr; | |
995 | ||
996 | if (e->expr_type == EXPR_ARRAY) | |
997 | { | |
998 | if (check_constructor_type (e->value.constructor) == FAILURE) | |
999 | return FAILURE; | |
1000 | ||
1001 | continue; | |
1002 | } | |
1003 | ||
1004 | if (check_element_type (e)) | |
1005 | return FAILURE; | |
1006 | } | |
1007 | ||
1008 | return SUCCESS; | |
1009 | } | |
1010 | ||
1011 | ||
1012 | /* Check that all elements of an array constructor are the same type. | |
1013 | On FAILURE, an error has been generated. */ | |
1014 | ||
1015 | try | |
1016 | gfc_check_constructor_type (gfc_expr * e) | |
1017 | { | |
1018 | try t; | |
1019 | ||
1020 | cons_state = CONS_START; | |
1021 | gfc_clear_ts (&constructor_ts); | |
1022 | ||
1023 | t = check_constructor_type (e->value.constructor); | |
1024 | if (t == SUCCESS && e->ts.type == BT_UNKNOWN) | |
1025 | e->ts = constructor_ts; | |
1026 | ||
1027 | return t; | |
1028 | } | |
1029 | ||
1030 | ||
1031 | ||
1032 | typedef struct cons_stack | |
1033 | { | |
1034 | gfc_iterator *iterator; | |
1035 | struct cons_stack *previous; | |
1036 | } | |
1037 | cons_stack; | |
1038 | ||
1039 | static cons_stack *base; | |
1040 | ||
1041 | static try check_constructor (gfc_constructor *, try (*)(gfc_expr *)); | |
1042 | ||
1043 | /* Check an EXPR_VARIABLE expression in a constructor to make sure | |
1044 | that that variable is an iteration variables. */ | |
1045 | ||
1046 | try | |
1047 | gfc_check_iter_variable (gfc_expr * expr) | |
1048 | { | |
1049 | ||
1050 | gfc_symbol *sym; | |
1051 | cons_stack *c; | |
1052 | ||
1053 | sym = expr->symtree->n.sym; | |
1054 | ||
1055 | for (c = base; c; c = c->previous) | |
1056 | if (sym == c->iterator->var->symtree->n.sym) | |
1057 | return SUCCESS; | |
1058 | ||
1059 | return FAILURE; | |
1060 | } | |
1061 | ||
1062 | ||
1063 | /* Recursive work function for gfc_check_constructor(). This amounts | |
1064 | to calling the check function for each expression in the | |
1065 | constructor, giving variables with the names of iterators a pass. */ | |
1066 | ||
1067 | static try | |
1068 | check_constructor (gfc_constructor * c, try (*check_function) (gfc_expr *)) | |
1069 | { | |
1070 | cons_stack element; | |
1071 | gfc_expr *e; | |
1072 | try t; | |
1073 | ||
1074 | for (; c; c = c->next) | |
1075 | { | |
1076 | e = c->expr; | |
1077 | ||
1078 | if (e->expr_type != EXPR_ARRAY) | |
1079 | { | |
1080 | if ((*check_function) (e) == FAILURE) | |
1081 | return FAILURE; | |
1082 | continue; | |
1083 | } | |
1084 | ||
1085 | element.previous = base; | |
1086 | element.iterator = c->iterator; | |
1087 | ||
1088 | base = &element; | |
1089 | t = check_constructor (e->value.constructor, check_function); | |
1090 | base = element.previous; | |
1091 | ||
1092 | if (t == FAILURE) | |
1093 | return FAILURE; | |
1094 | } | |
1095 | ||
1096 | /* Nothing went wrong, so all OK. */ | |
1097 | return SUCCESS; | |
1098 | } | |
1099 | ||
1100 | ||
1101 | /* Checks a constructor to see if it is a particular kind of | |
1102 | expression -- specification, restricted, or initialization as | |
1103 | determined by the check_function. */ | |
1104 | ||
1105 | try | |
1106 | gfc_check_constructor (gfc_expr * expr, try (*check_function) (gfc_expr *)) | |
1107 | { | |
1108 | cons_stack *base_save; | |
1109 | try t; | |
1110 | ||
1111 | base_save = base; | |
1112 | base = NULL; | |
1113 | ||
1114 | t = check_constructor (expr->value.constructor, check_function); | |
1115 | base = base_save; | |
1116 | ||
1117 | return t; | |
1118 | } | |
1119 | ||
1120 | ||
1121 | ||
1122 | /**************** Simplification of array constructors ****************/ | |
1123 | ||
1124 | iterator_stack *iter_stack; | |
1125 | ||
1126 | typedef struct | |
1127 | { | |
1128 | gfc_constructor *new_head, *new_tail; | |
1129 | int extract_count, extract_n; | |
1130 | gfc_expr *extracted; | |
1131 | mpz_t *count; | |
1132 | ||
1133 | mpz_t *offset; | |
1134 | gfc_component *component; | |
1135 | mpz_t *repeat; | |
1136 | ||
1137 | try (*expand_work_function) (gfc_expr *); | |
1138 | } | |
1139 | expand_info; | |
1140 | ||
1141 | static expand_info current_expand; | |
1142 | ||
1143 | static try expand_constructor (gfc_constructor *); | |
1144 | ||
1145 | ||
1146 | /* Work function that counts the number of elements present in a | |
1147 | constructor. */ | |
1148 | ||
1149 | static try | |
1150 | count_elements (gfc_expr * e) | |
1151 | { | |
1152 | mpz_t result; | |
1153 | ||
1154 | if (e->rank == 0) | |
1155 | mpz_add_ui (*current_expand.count, *current_expand.count, 1); | |
1156 | else | |
1157 | { | |
1158 | if (gfc_array_size (e, &result) == FAILURE) | |
1159 | { | |
1160 | gfc_free_expr (e); | |
1161 | return FAILURE; | |
1162 | } | |
1163 | ||
1164 | mpz_add (*current_expand.count, *current_expand.count, result); | |
1165 | mpz_clear (result); | |
1166 | } | |
1167 | ||
1168 | gfc_free_expr (e); | |
1169 | return SUCCESS; | |
1170 | } | |
1171 | ||
1172 | ||
1173 | /* Work function that extracts a particular element from an array | |
1174 | constructor, freeing the rest. */ | |
1175 | ||
1176 | static try | |
1177 | extract_element (gfc_expr * e) | |
1178 | { | |
1179 | ||
1180 | if (e->rank != 0) | |
1181 | { /* Something unextractable */ | |
1182 | gfc_free_expr (e); | |
1183 | return FAILURE; | |
1184 | } | |
1185 | ||
1186 | if (current_expand.extract_count == current_expand.extract_n) | |
1187 | current_expand.extracted = e; | |
1188 | else | |
1189 | gfc_free_expr (e); | |
1190 | ||
1191 | current_expand.extract_count++; | |
1192 | return SUCCESS; | |
1193 | } | |
1194 | ||
1195 | ||
1196 | /* Work function that constructs a new constructor out of the old one, | |
1197 | stringing new elements together. */ | |
1198 | ||
1199 | static try | |
1200 | expand (gfc_expr * e) | |
1201 | { | |
1202 | ||
1203 | if (current_expand.new_head == NULL) | |
1204 | current_expand.new_head = current_expand.new_tail = | |
1205 | gfc_get_constructor (); | |
1206 | else | |
1207 | { | |
1208 | current_expand.new_tail->next = gfc_get_constructor (); | |
1209 | current_expand.new_tail = current_expand.new_tail->next; | |
1210 | } | |
1211 | ||
1212 | current_expand.new_tail->where = e->where; | |
1213 | current_expand.new_tail->expr = e; | |
1214 | ||
1215 | mpz_set (current_expand.new_tail->n.offset, *current_expand.offset); | |
1216 | current_expand.new_tail->n.component = current_expand.component; | |
1217 | mpz_set (current_expand.new_tail->repeat, *current_expand.repeat); | |
1218 | return SUCCESS; | |
1219 | } | |
1220 | ||
1221 | ||
1222 | /* Given an initialization expression that is a variable reference, | |
1223 | substitute the current value of the iteration variable. */ | |
1224 | ||
1225 | void | |
1226 | gfc_simplify_iterator_var (gfc_expr * e) | |
1227 | { | |
1228 | iterator_stack *p; | |
1229 | ||
1230 | for (p = iter_stack; p; p = p->prev) | |
1231 | if (e->symtree == p->variable) | |
1232 | break; | |
1233 | ||
1234 | if (p == NULL) | |
1235 | return; /* Variable not found */ | |
1236 | ||
1237 | gfc_replace_expr (e, gfc_int_expr (0)); | |
1238 | ||
1239 | mpz_set (e->value.integer, p->value); | |
1240 | ||
1241 | return; | |
1242 | } | |
1243 | ||
1244 | ||
1245 | /* Expand an expression with that is inside of a constructor, | |
1246 | recursing into other constructors if present. */ | |
1247 | ||
1248 | static try | |
1249 | expand_expr (gfc_expr * e) | |
1250 | { | |
1251 | ||
1252 | if (e->expr_type == EXPR_ARRAY) | |
1253 | return expand_constructor (e->value.constructor); | |
1254 | ||
1255 | e = gfc_copy_expr (e); | |
1256 | ||
1257 | if (gfc_simplify_expr (e, 1) == FAILURE) | |
1258 | { | |
1259 | gfc_free_expr (e); | |
1260 | return FAILURE; | |
1261 | } | |
1262 | ||
1263 | return current_expand.expand_work_function (e); | |
1264 | } | |
1265 | ||
1266 | ||
1267 | static try | |
1268 | expand_iterator (gfc_constructor * c) | |
1269 | { | |
1270 | gfc_expr *start, *end, *step; | |
1271 | iterator_stack frame; | |
1272 | mpz_t trip; | |
1273 | try t; | |
1274 | ||
1275 | end = step = NULL; | |
1276 | ||
1277 | t = FAILURE; | |
1278 | ||
1279 | mpz_init (trip); | |
1280 | mpz_init (frame.value); | |
1281 | ||
1282 | start = gfc_copy_expr (c->iterator->start); | |
1283 | if (gfc_simplify_expr (start, 1) == FAILURE) | |
1284 | goto cleanup; | |
1285 | ||
1286 | if (start->expr_type != EXPR_CONSTANT || start->ts.type != BT_INTEGER) | |
1287 | goto cleanup; | |
1288 | ||
1289 | end = gfc_copy_expr (c->iterator->end); | |
1290 | if (gfc_simplify_expr (end, 1) == FAILURE) | |
1291 | goto cleanup; | |
1292 | ||
1293 | if (end->expr_type != EXPR_CONSTANT || end->ts.type != BT_INTEGER) | |
1294 | goto cleanup; | |
1295 | ||
1296 | step = gfc_copy_expr (c->iterator->step); | |
1297 | if (gfc_simplify_expr (step, 1) == FAILURE) | |
1298 | goto cleanup; | |
1299 | ||
1300 | if (step->expr_type != EXPR_CONSTANT || step->ts.type != BT_INTEGER) | |
1301 | goto cleanup; | |
1302 | ||
1303 | if (mpz_sgn (step->value.integer) == 0) | |
1304 | { | |
1305 | gfc_error ("Iterator step at %L cannot be zero", &step->where); | |
1306 | goto cleanup; | |
1307 | } | |
1308 | ||
1309 | /* Calculate the trip count of the loop. */ | |
1310 | mpz_sub (trip, end->value.integer, start->value.integer); | |
1311 | mpz_add (trip, trip, step->value.integer); | |
1312 | mpz_tdiv_q (trip, trip, step->value.integer); | |
1313 | ||
1314 | mpz_set (frame.value, start->value.integer); | |
1315 | ||
1316 | frame.prev = iter_stack; | |
1317 | frame.variable = c->iterator->var->symtree; | |
1318 | iter_stack = &frame; | |
1319 | ||
1320 | while (mpz_sgn (trip) > 0) | |
1321 | { | |
1322 | if (expand_expr (c->expr) == FAILURE) | |
1323 | goto cleanup; | |
1324 | ||
1325 | mpz_add (frame.value, frame.value, step->value.integer); | |
1326 | mpz_sub_ui (trip, trip, 1); | |
1327 | } | |
1328 | ||
1329 | t = SUCCESS; | |
1330 | ||
1331 | cleanup: | |
1332 | gfc_free_expr (start); | |
1333 | gfc_free_expr (end); | |
1334 | gfc_free_expr (step); | |
1335 | ||
1336 | mpz_clear (trip); | |
1337 | mpz_clear (frame.value); | |
1338 | ||
1339 | iter_stack = frame.prev; | |
1340 | ||
1341 | return t; | |
1342 | } | |
1343 | ||
1344 | ||
1345 | /* Expand a constructor into constant constructors without any | |
1346 | iterators, calling the work function for each of the expanded | |
1347 | expressions. The work function needs to either save or free the | |
1348 | passed expression. */ | |
1349 | ||
1350 | static try | |
1351 | expand_constructor (gfc_constructor * c) | |
1352 | { | |
1353 | gfc_expr *e; | |
1354 | ||
1355 | for (; c; c = c->next) | |
1356 | { | |
1357 | if (c->iterator != NULL) | |
1358 | { | |
1359 | if (expand_iterator (c) == FAILURE) | |
1360 | return FAILURE; | |
1361 | continue; | |
1362 | } | |
1363 | ||
1364 | e = c->expr; | |
1365 | ||
1366 | if (e->expr_type == EXPR_ARRAY) | |
1367 | { | |
1368 | if (expand_constructor (e->value.constructor) == FAILURE) | |
1369 | return FAILURE; | |
1370 | ||
1371 | continue; | |
1372 | } | |
1373 | ||
1374 | e = gfc_copy_expr (e); | |
1375 | if (gfc_simplify_expr (e, 1) == FAILURE) | |
1376 | { | |
1377 | gfc_free_expr (e); | |
1378 | return FAILURE; | |
1379 | } | |
1380 | current_expand.offset = &c->n.offset; | |
1381 | current_expand.component = c->n.component; | |
1382 | current_expand.repeat = &c->repeat; | |
1383 | if (current_expand.expand_work_function (e) == FAILURE) | |
1384 | return FAILURE; | |
1385 | } | |
1386 | return SUCCESS; | |
1387 | } | |
1388 | ||
1389 | ||
1390 | /* Top level subroutine for expanding constructors. We only expand | |
1391 | constructor if they are small enough. */ | |
1392 | ||
1393 | try | |
1394 | gfc_expand_constructor (gfc_expr * e) | |
1395 | { | |
1396 | expand_info expand_save; | |
1397 | gfc_expr *f; | |
1398 | try rc; | |
1399 | ||
1400 | f = gfc_get_array_element (e, GFC_MAX_AC_EXPAND); | |
1401 | if (f != NULL) | |
1402 | { | |
1403 | gfc_free_expr (f); | |
1404 | return SUCCESS; | |
1405 | } | |
1406 | ||
1407 | expand_save = current_expand; | |
1408 | current_expand.new_head = current_expand.new_tail = NULL; | |
1409 | ||
1410 | iter_stack = NULL; | |
1411 | ||
1412 | current_expand.expand_work_function = expand; | |
1413 | ||
1414 | if (expand_constructor (e->value.constructor) == FAILURE) | |
1415 | { | |
1416 | gfc_free_constructor (current_expand.new_head); | |
1417 | rc = FAILURE; | |
1418 | goto done; | |
1419 | } | |
1420 | ||
1421 | gfc_free_constructor (e->value.constructor); | |
1422 | e->value.constructor = current_expand.new_head; | |
1423 | ||
1424 | rc = SUCCESS; | |
1425 | ||
1426 | done: | |
1427 | current_expand = expand_save; | |
1428 | ||
1429 | return rc; | |
1430 | } | |
1431 | ||
1432 | ||
1433 | /* Work function for checking that an element of a constructor is a | |
1434 | constant, after removal of any iteration variables. We return | |
1435 | FAILURE if not so. */ | |
1436 | ||
1437 | static try | |
1438 | constant_element (gfc_expr * e) | |
1439 | { | |
1440 | int rv; | |
1441 | ||
1442 | rv = gfc_is_constant_expr (e); | |
1443 | gfc_free_expr (e); | |
1444 | ||
1445 | return rv ? SUCCESS : FAILURE; | |
1446 | } | |
1447 | ||
1448 | ||
1449 | /* Given an array constructor, determine if the constructor is | |
1450 | constant or not by expanding it and making sure that all elements | |
1451 | are constants. This is a bit of a hack since something like (/ (i, | |
1452 | i=1,100000000) /) will take a while as* opposed to a more clever | |
1453 | function that traverses the expression tree. FIXME. */ | |
1454 | ||
1455 | int | |
1456 | gfc_constant_ac (gfc_expr * e) | |
1457 | { | |
1458 | expand_info expand_save; | |
1459 | try rc; | |
1460 | ||
1461 | iter_stack = NULL; | |
1462 | expand_save = current_expand; | |
1463 | current_expand.expand_work_function = constant_element; | |
1464 | ||
1465 | rc = expand_constructor (e->value.constructor); | |
1466 | ||
1467 | current_expand = expand_save; | |
1468 | if (rc == FAILURE) | |
1469 | return 0; | |
1470 | ||
1471 | return 1; | |
1472 | } | |
1473 | ||
1474 | ||
1475 | /* Returns nonzero if an array constructor has been completely | |
1476 | expanded (no iterators) and zero if iterators are present. */ | |
1477 | ||
1478 | int | |
1479 | gfc_expanded_ac (gfc_expr * e) | |
1480 | { | |
1481 | gfc_constructor *p; | |
1482 | ||
1483 | if (e->expr_type == EXPR_ARRAY) | |
1484 | for (p = e->value.constructor; p; p = p->next) | |
1485 | if (p->iterator != NULL || !gfc_expanded_ac (p->expr)) | |
1486 | return 0; | |
1487 | ||
1488 | return 1; | |
1489 | } | |
1490 | ||
1491 | ||
1492 | /*************** Type resolution of array constructors ***************/ | |
1493 | ||
1494 | /* Recursive array list resolution function. All of the elements must | |
1495 | be of the same type. */ | |
1496 | ||
1497 | static try | |
1498 | resolve_array_list (gfc_constructor * p) | |
1499 | { | |
1500 | try t; | |
1501 | ||
1502 | t = SUCCESS; | |
1503 | ||
1504 | for (; p; p = p->next) | |
1505 | { | |
1506 | if (p->iterator != NULL | |
8d5cfa27 | 1507 | && gfc_resolve_iterator (p->iterator, false) == FAILURE) |
6de9cd9a DN |
1508 | t = FAILURE; |
1509 | ||
1510 | if (gfc_resolve_expr (p->expr) == FAILURE) | |
1511 | t = FAILURE; | |
1512 | } | |
1513 | ||
1514 | return t; | |
1515 | } | |
1516 | ||
df7cc9b5 FW |
1517 | /* Resolve character array constructor. If it is a constant character array and |
1518 | not specified character length, update character length to the maximum of | |
1519 | its element constructors' length. */ | |
6de9cd9a | 1520 | |
df7cc9b5 FW |
1521 | static void |
1522 | resolve_character_array_constructor (gfc_expr * expr) | |
1523 | { | |
1524 | gfc_constructor * p; | |
1525 | int max_length; | |
1526 | ||
1527 | gcc_assert (expr->expr_type == EXPR_ARRAY); | |
1528 | gcc_assert (expr->ts.type == BT_CHARACTER); | |
1529 | ||
1530 | max_length = -1; | |
1531 | ||
1532 | if (expr->ts.cl == NULL || expr->ts.cl->length == NULL) | |
1533 | { | |
1534 | /* Find the maximum length of the elements. Do nothing for variable array | |
1535 | constructor. */ | |
1536 | for (p = expr->value.constructor; p; p = p->next) | |
1537 | if (p->expr->expr_type == EXPR_CONSTANT) | |
1538 | max_length = MAX (p->expr->value.character.length, max_length); | |
1539 | else | |
1540 | return; | |
1541 | ||
1542 | if (max_length != -1) | |
1543 | { | |
1544 | /* Update the character length of the array constructor. */ | |
1545 | if (expr->ts.cl == NULL) | |
1546 | expr->ts.cl = gfc_get_charlen (); | |
1547 | expr->ts.cl->length = gfc_int_expr (max_length); | |
1548 | /* Update the element constructors. */ | |
1549 | for (p = expr->value.constructor; p; p = p->next) | |
1550 | gfc_set_constant_character_len (max_length, p->expr); | |
1551 | } | |
1552 | } | |
1553 | } | |
1554 | ||
1555 | /* Resolve all of the expressions in an array list. */ | |
6de9cd9a DN |
1556 | |
1557 | try | |
1558 | gfc_resolve_array_constructor (gfc_expr * expr) | |
1559 | { | |
1560 | try t; | |
1561 | ||
1562 | t = resolve_array_list (expr->value.constructor); | |
1563 | if (t == SUCCESS) | |
1564 | t = gfc_check_constructor_type (expr); | |
df7cc9b5 FW |
1565 | if (t == SUCCESS && expr->ts.type == BT_CHARACTER) |
1566 | resolve_character_array_constructor (expr); | |
6de9cd9a DN |
1567 | |
1568 | return t; | |
1569 | } | |
1570 | ||
1571 | ||
1572 | /* Copy an iterator structure. */ | |
1573 | ||
1574 | static gfc_iterator * | |
1575 | copy_iterator (gfc_iterator * src) | |
1576 | { | |
1577 | gfc_iterator *dest; | |
1578 | ||
1579 | if (src == NULL) | |
1580 | return NULL; | |
1581 | ||
1582 | dest = gfc_get_iterator (); | |
1583 | ||
1584 | dest->var = gfc_copy_expr (src->var); | |
1585 | dest->start = gfc_copy_expr (src->start); | |
1586 | dest->end = gfc_copy_expr (src->end); | |
1587 | dest->step = gfc_copy_expr (src->step); | |
1588 | ||
1589 | return dest; | |
1590 | } | |
1591 | ||
1592 | ||
1593 | /* Copy a constructor structure. */ | |
1594 | ||
1595 | gfc_constructor * | |
1596 | gfc_copy_constructor (gfc_constructor * src) | |
1597 | { | |
1598 | gfc_constructor *dest; | |
1599 | gfc_constructor *tail; | |
1600 | ||
1601 | if (src == NULL) | |
1602 | return NULL; | |
1603 | ||
1604 | dest = tail = NULL; | |
1605 | while (src) | |
1606 | { | |
1607 | if (dest == NULL) | |
1608 | dest = tail = gfc_get_constructor (); | |
1609 | else | |
1610 | { | |
1611 | tail->next = gfc_get_constructor (); | |
1612 | tail = tail->next; | |
1613 | } | |
1614 | tail->where = src->where; | |
1615 | tail->expr = gfc_copy_expr (src->expr); | |
1616 | tail->iterator = copy_iterator (src->iterator); | |
1617 | mpz_set (tail->n.offset, src->n.offset); | |
1618 | tail->n.component = src->n.component; | |
1619 | mpz_set (tail->repeat, src->repeat); | |
1620 | src = src->next; | |
1621 | } | |
1622 | ||
1623 | return dest; | |
1624 | } | |
1625 | ||
1626 | ||
1627 | /* Given an array expression and an element number (starting at zero), | |
1628 | return a pointer to the array element. NULL is returned if the | |
1629 | size of the array has been exceeded. The expression node returned | |
1630 | remains a part of the array and should not be freed. Access is not | |
1631 | efficient at all, but this is another place where things do not | |
1632 | have to be particularly fast. */ | |
1633 | ||
1634 | gfc_expr * | |
1635 | gfc_get_array_element (gfc_expr * array, int element) | |
1636 | { | |
1637 | expand_info expand_save; | |
1638 | gfc_expr *e; | |
1639 | try rc; | |
1640 | ||
1641 | expand_save = current_expand; | |
1642 | current_expand.extract_n = element; | |
1643 | current_expand.expand_work_function = extract_element; | |
1644 | current_expand.extracted = NULL; | |
1645 | current_expand.extract_count = 0; | |
1646 | ||
1647 | iter_stack = NULL; | |
1648 | ||
1649 | rc = expand_constructor (array->value.constructor); | |
1650 | e = current_expand.extracted; | |
1651 | current_expand = expand_save; | |
1652 | ||
1653 | if (rc == FAILURE) | |
1654 | return NULL; | |
1655 | ||
1656 | return e; | |
1657 | } | |
1658 | ||
1659 | ||
1660 | /********* Subroutines for determining the size of an array *********/ | |
1661 | ||
1f2959f0 | 1662 | /* These are needed just to accommodate RESHAPE(). There are no |
6de9cd9a | 1663 | diagnostics here, we just return a negative number if something |
f7b529fa | 1664 | goes wrong. */ |
6de9cd9a DN |
1665 | |
1666 | ||
1667 | /* Get the size of single dimension of an array specification. The | |
1668 | array is guaranteed to be one dimensional. */ | |
1669 | ||
1670 | static try | |
1671 | spec_dimen_size (gfc_array_spec * as, int dimen, mpz_t * result) | |
1672 | { | |
1673 | ||
1674 | if (as == NULL) | |
1675 | return FAILURE; | |
1676 | ||
1677 | if (dimen < 0 || dimen > as->rank - 1) | |
1678 | gfc_internal_error ("spec_dimen_size(): Bad dimension"); | |
1679 | ||
1680 | if (as->type != AS_EXPLICIT | |
1681 | || as->lower[dimen]->expr_type != EXPR_CONSTANT | |
1682 | || as->upper[dimen]->expr_type != EXPR_CONSTANT) | |
1683 | return FAILURE; | |
1684 | ||
1685 | mpz_init (*result); | |
1686 | ||
1687 | mpz_sub (*result, as->upper[dimen]->value.integer, | |
1688 | as->lower[dimen]->value.integer); | |
1689 | ||
1690 | mpz_add_ui (*result, *result, 1); | |
1691 | ||
1692 | return SUCCESS; | |
1693 | } | |
1694 | ||
1695 | ||
1696 | try | |
1697 | spec_size (gfc_array_spec * as, mpz_t * result) | |
1698 | { | |
1699 | mpz_t size; | |
1700 | int d; | |
1701 | ||
1702 | mpz_init_set_ui (*result, 1); | |
1703 | ||
1704 | for (d = 0; d < as->rank; d++) | |
1705 | { | |
1706 | if (spec_dimen_size (as, d, &size) == FAILURE) | |
1707 | { | |
1708 | mpz_clear (*result); | |
1709 | return FAILURE; | |
1710 | } | |
1711 | ||
1712 | mpz_mul (*result, *result, size); | |
1713 | mpz_clear (size); | |
1714 | } | |
1715 | ||
1716 | return SUCCESS; | |
1717 | } | |
1718 | ||
1719 | ||
1720 | /* Get the number of elements in an array section. */ | |
1721 | ||
1722 | static try | |
1723 | ref_dimen_size (gfc_array_ref * ar, int dimen, mpz_t * result) | |
1724 | { | |
1725 | mpz_t upper, lower, stride; | |
1726 | try t; | |
1727 | ||
1728 | if (dimen < 0 || ar == NULL || dimen > ar->dimen - 1) | |
1729 | gfc_internal_error ("ref_dimen_size(): Bad dimension"); | |
1730 | ||
1731 | switch (ar->dimen_type[dimen]) | |
1732 | { | |
1733 | case DIMEN_ELEMENT: | |
1734 | mpz_init (*result); | |
1735 | mpz_set_ui (*result, 1); | |
1736 | t = SUCCESS; | |
1737 | break; | |
1738 | ||
1739 | case DIMEN_VECTOR: | |
1740 | t = gfc_array_size (ar->start[dimen], result); /* Recurse! */ | |
1741 | break; | |
1742 | ||
1743 | case DIMEN_RANGE: | |
1744 | mpz_init (upper); | |
1745 | mpz_init (lower); | |
1746 | mpz_init (stride); | |
1747 | t = FAILURE; | |
1748 | ||
1749 | if (ar->start[dimen] == NULL) | |
1750 | { | |
1751 | if (ar->as->lower[dimen] == NULL | |
1752 | || ar->as->lower[dimen]->expr_type != EXPR_CONSTANT) | |
1753 | goto cleanup; | |
1754 | mpz_set (lower, ar->as->lower[dimen]->value.integer); | |
1755 | } | |
1756 | else | |
1757 | { | |
1758 | if (ar->start[dimen]->expr_type != EXPR_CONSTANT) | |
1759 | goto cleanup; | |
1760 | mpz_set (lower, ar->start[dimen]->value.integer); | |
1761 | } | |
1762 | ||
1763 | if (ar->end[dimen] == NULL) | |
1764 | { | |
1765 | if (ar->as->upper[dimen] == NULL | |
1766 | || ar->as->upper[dimen]->expr_type != EXPR_CONSTANT) | |
1767 | goto cleanup; | |
1768 | mpz_set (upper, ar->as->upper[dimen]->value.integer); | |
1769 | } | |
1770 | else | |
1771 | { | |
1772 | if (ar->end[dimen]->expr_type != EXPR_CONSTANT) | |
1773 | goto cleanup; | |
1774 | mpz_set (upper, ar->end[dimen]->value.integer); | |
1775 | } | |
1776 | ||
1777 | if (ar->stride[dimen] == NULL) | |
1778 | mpz_set_ui (stride, 1); | |
1779 | else | |
1780 | { | |
1781 | if (ar->stride[dimen]->expr_type != EXPR_CONSTANT) | |
1782 | goto cleanup; | |
1783 | mpz_set (stride, ar->stride[dimen]->value.integer); | |
1784 | } | |
1785 | ||
1786 | mpz_init (*result); | |
1787 | mpz_sub (*result, upper, lower); | |
1788 | mpz_add (*result, *result, stride); | |
1789 | mpz_div (*result, *result, stride); | |
1790 | ||
1791 | /* Zero stride caught earlier. */ | |
1792 | if (mpz_cmp_ui (*result, 0) < 0) | |
1793 | mpz_set_ui (*result, 0); | |
1794 | t = SUCCESS; | |
1795 | ||
1796 | cleanup: | |
1797 | mpz_clear (upper); | |
1798 | mpz_clear (lower); | |
1799 | mpz_clear (stride); | |
1800 | return t; | |
1801 | ||
1802 | default: | |
1803 | gfc_internal_error ("ref_dimen_size(): Bad dimen_type"); | |
1804 | } | |
1805 | ||
1806 | return t; | |
1807 | } | |
1808 | ||
1809 | ||
1810 | static try | |
1811 | ref_size (gfc_array_ref * ar, mpz_t * result) | |
1812 | { | |
1813 | mpz_t size; | |
1814 | int d; | |
1815 | ||
1816 | mpz_init_set_ui (*result, 1); | |
1817 | ||
1818 | for (d = 0; d < ar->dimen; d++) | |
1819 | { | |
1820 | if (ref_dimen_size (ar, d, &size) == FAILURE) | |
1821 | { | |
1822 | mpz_clear (*result); | |
1823 | return FAILURE; | |
1824 | } | |
1825 | ||
1826 | mpz_mul (*result, *result, size); | |
1827 | mpz_clear (size); | |
1828 | } | |
1829 | ||
1830 | return SUCCESS; | |
1831 | } | |
1832 | ||
1833 | ||
1834 | /* Given an array expression and a dimension, figure out how many | |
1835 | elements it has along that dimension. Returns SUCCESS if we were | |
1836 | able to return a result in the 'result' variable, FAILURE | |
1837 | otherwise. */ | |
1838 | ||
1839 | try | |
1840 | gfc_array_dimen_size (gfc_expr * array, int dimen, mpz_t * result) | |
1841 | { | |
1842 | gfc_ref *ref; | |
1843 | int i; | |
1844 | ||
1845 | if (dimen < 0 || array == NULL || dimen > array->rank - 1) | |
1846 | gfc_internal_error ("gfc_array_dimen_size(): Bad dimension"); | |
1847 | ||
1848 | switch (array->expr_type) | |
1849 | { | |
1850 | case EXPR_VARIABLE: | |
1851 | case EXPR_FUNCTION: | |
1852 | for (ref = array->ref; ref; ref = ref->next) | |
1853 | { | |
1854 | if (ref->type != REF_ARRAY) | |
1855 | continue; | |
1856 | ||
1857 | if (ref->u.ar.type == AR_FULL) | |
1858 | return spec_dimen_size (ref->u.ar.as, dimen, result); | |
1859 | ||
1860 | if (ref->u.ar.type == AR_SECTION) | |
1861 | { | |
1862 | for (i = 0; dimen >= 0; i++) | |
1863 | if (ref->u.ar.dimen_type[i] != DIMEN_ELEMENT) | |
1864 | dimen--; | |
1865 | ||
1866 | return ref_dimen_size (&ref->u.ar, i - 1, result); | |
1867 | } | |
1868 | } | |
1869 | ||
1870 | if (spec_dimen_size (array->symtree->n.sym->as, dimen, result) == FAILURE) | |
1871 | return FAILURE; | |
1872 | ||
1873 | break; | |
1874 | ||
1875 | case EXPR_ARRAY: | |
1876 | if (array->shape == NULL) { | |
1877 | /* Expressions with rank > 1 should have "shape" properly set */ | |
1878 | if ( array->rank != 1 ) | |
1879 | gfc_internal_error ("gfc_array_dimen_size(): Bad EXPR_ARRAY expr"); | |
1880 | return gfc_array_size(array, result); | |
1881 | } | |
1882 | ||
1883 | /* Fall through */ | |
1884 | default: | |
1885 | if (array->shape == NULL) | |
1886 | return FAILURE; | |
1887 | ||
1888 | mpz_init_set (*result, array->shape[dimen]); | |
1889 | ||
1890 | break; | |
1891 | } | |
1892 | ||
1893 | return SUCCESS; | |
1894 | } | |
1895 | ||
1896 | ||
1897 | /* Given an array expression, figure out how many elements are in the | |
1898 | array. Returns SUCCESS if this is possible, and sets the 'result' | |
1899 | variable. Otherwise returns FAILURE. */ | |
1900 | ||
1901 | try | |
1902 | gfc_array_size (gfc_expr * array, mpz_t * result) | |
1903 | { | |
1904 | expand_info expand_save; | |
1905 | gfc_ref *ref; | |
1906 | int i, flag; | |
1907 | try t; | |
1908 | ||
1909 | switch (array->expr_type) | |
1910 | { | |
1911 | case EXPR_ARRAY: | |
1912 | flag = gfc_suppress_error; | |
1913 | gfc_suppress_error = 1; | |
1914 | ||
1915 | expand_save = current_expand; | |
1916 | ||
1917 | current_expand.count = result; | |
1918 | mpz_init_set_ui (*result, 0); | |
1919 | ||
1920 | current_expand.expand_work_function = count_elements; | |
1921 | iter_stack = NULL; | |
1922 | ||
1923 | t = expand_constructor (array->value.constructor); | |
1924 | gfc_suppress_error = flag; | |
1925 | ||
1926 | if (t == FAILURE) | |
1927 | mpz_clear (*result); | |
1928 | current_expand = expand_save; | |
1929 | return t; | |
1930 | ||
1931 | case EXPR_VARIABLE: | |
1932 | for (ref = array->ref; ref; ref = ref->next) | |
1933 | { | |
1934 | if (ref->type != REF_ARRAY) | |
1935 | continue; | |
1936 | ||
1937 | if (ref->u.ar.type == AR_FULL) | |
1938 | return spec_size (ref->u.ar.as, result); | |
1939 | ||
1940 | if (ref->u.ar.type == AR_SECTION) | |
1941 | return ref_size (&ref->u.ar, result); | |
1942 | } | |
1943 | ||
1944 | return spec_size (array->symtree->n.sym->as, result); | |
1945 | ||
1946 | ||
1947 | default: | |
1948 | if (array->rank == 0 || array->shape == NULL) | |
1949 | return FAILURE; | |
1950 | ||
1951 | mpz_init_set_ui (*result, 1); | |
1952 | ||
1953 | for (i = 0; i < array->rank; i++) | |
1954 | mpz_mul (*result, *result, array->shape[i]); | |
1955 | ||
1956 | break; | |
1957 | } | |
1958 | ||
1959 | return SUCCESS; | |
1960 | } | |
1961 | ||
1962 | ||
1963 | /* Given an array reference, return the shape of the reference in an | |
1964 | array of mpz_t integers. */ | |
1965 | ||
1966 | try | |
1967 | gfc_array_ref_shape (gfc_array_ref * ar, mpz_t * shape) | |
1968 | { | |
1969 | int d; | |
1970 | int i; | |
1971 | ||
1972 | d = 0; | |
1973 | ||
1974 | switch (ar->type) | |
1975 | { | |
1976 | case AR_FULL: | |
1977 | for (; d < ar->as->rank; d++) | |
1978 | if (spec_dimen_size (ar->as, d, &shape[d]) == FAILURE) | |
1979 | goto cleanup; | |
1980 | ||
1981 | return SUCCESS; | |
1982 | ||
1983 | case AR_SECTION: | |
1984 | for (i = 0; i < ar->dimen; i++) | |
1985 | { | |
1986 | if (ar->dimen_type[i] != DIMEN_ELEMENT) | |
1987 | { | |
1988 | if (ref_dimen_size (ar, i, &shape[d]) == FAILURE) | |
1989 | goto cleanup; | |
1990 | d++; | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | return SUCCESS; | |
1995 | ||
1996 | default: | |
1997 | break; | |
1998 | } | |
1999 | ||
2000 | cleanup: | |
2001 | for (d--; d >= 0; d--) | |
2002 | mpz_clear (shape[d]); | |
2003 | ||
2004 | return FAILURE; | |
2005 | } | |
2006 | ||
2007 | ||
2008 | /* Given an array expression, find the array reference structure that | |
2009 | characterizes the reference. */ | |
2010 | ||
2011 | gfc_array_ref * | |
2012 | gfc_find_array_ref (gfc_expr * e) | |
2013 | { | |
2014 | gfc_ref *ref; | |
2015 | ||
2016 | for (ref = e->ref; ref; ref = ref->next) | |
2017 | if (ref->type == REF_ARRAY | |
2018 | && (ref->u.ar.type == AR_FULL | |
2019 | || ref->u.ar.type == AR_SECTION)) | |
2020 | break; | |
2021 | ||
2022 | if (ref == NULL) | |
2023 | gfc_internal_error ("gfc_find_array_ref(): No ref found"); | |
2024 | ||
2025 | return &ref->u.ar; | |
2026 | } | |
4077d207 TS |
2027 | |
2028 | ||
2029 | /* Find out if an array shape is known at compile time. */ | |
2030 | ||
2031 | int | |
2032 | gfc_is_compile_time_shape (gfc_array_spec *as) | |
2033 | { | |
2034 | int i; | |
2035 | ||
2036 | if (as->type != AS_EXPLICIT) | |
2037 | return 0; | |
2038 | ||
2039 | for (i = 0; i < as->rank; i++) | |
2040 | if (!gfc_is_constant_expr (as->lower[i]) | |
2041 | || !gfc_is_constant_expr (as->upper[i])) | |
2042 | return 0; | |
2043 | ||
2044 | return 1; | |
2045 | } |