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6de9cd9a | 1 | /* Declaration statement matcher |
ef558756 | 2 | Copyright (C) 2002, 2004 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 TS |
18 | along with GCC; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
6de9cd9a DN |
21 | |
22 | ||
23 | #include "config.h" | |
24 | #include "gfortran.h" | |
25 | #include "match.h" | |
26 | #include "parse.h" | |
27 | #include <string.h> | |
28 | ||
29 | ||
30 | /* This flag is set if a an old-style length selector is matched | |
31 | during a type-declaration statement. */ | |
32 | ||
33 | static int old_char_selector; | |
34 | ||
35 | /* When variables aquire types and attributes from a declaration | |
36 | statement, they get them from the following static variables. The | |
37 | first part of a declaration sets these variables and the second | |
38 | part copies these into symbol structures. */ | |
39 | ||
40 | static gfc_typespec current_ts; | |
41 | ||
42 | static symbol_attribute current_attr; | |
43 | static gfc_array_spec *current_as; | |
44 | static int colon_seen; | |
45 | ||
46 | /* gfc_new_block points to the symbol of a newly matched block. */ | |
47 | ||
48 | gfc_symbol *gfc_new_block; | |
49 | ||
50 | ||
294fbfc8 TS |
51 | /********************* DATA statement subroutines *********************/ |
52 | ||
53 | /* Free a gfc_data_variable structure and everything beneath it. */ | |
54 | ||
55 | static void | |
56 | free_variable (gfc_data_variable * p) | |
57 | { | |
58 | gfc_data_variable *q; | |
59 | ||
60 | for (; p; p = q) | |
61 | { | |
62 | q = p->next; | |
63 | gfc_free_expr (p->expr); | |
64 | gfc_free_iterator (&p->iter, 0); | |
65 | free_variable (p->list); | |
66 | ||
67 | gfc_free (p); | |
68 | } | |
69 | } | |
70 | ||
71 | ||
72 | /* Free a gfc_data_value structure and everything beneath it. */ | |
73 | ||
74 | static void | |
75 | free_value (gfc_data_value * p) | |
76 | { | |
77 | gfc_data_value *q; | |
78 | ||
79 | for (; p; p = q) | |
80 | { | |
81 | q = p->next; | |
82 | gfc_free_expr (p->expr); | |
83 | gfc_free (p); | |
84 | } | |
85 | } | |
86 | ||
87 | ||
88 | /* Free a list of gfc_data structures. */ | |
89 | ||
90 | void | |
91 | gfc_free_data (gfc_data * p) | |
92 | { | |
93 | gfc_data *q; | |
94 | ||
95 | for (; p; p = q) | |
96 | { | |
97 | q = p->next; | |
98 | ||
99 | free_variable (p->var); | |
100 | free_value (p->value); | |
101 | ||
102 | gfc_free (p); | |
103 | } | |
104 | } | |
105 | ||
106 | ||
107 | static match var_element (gfc_data_variable *); | |
108 | ||
109 | /* Match a list of variables terminated by an iterator and a right | |
110 | parenthesis. */ | |
111 | ||
112 | static match | |
113 | var_list (gfc_data_variable * parent) | |
114 | { | |
115 | gfc_data_variable *tail, var; | |
116 | match m; | |
117 | ||
118 | m = var_element (&var); | |
119 | if (m == MATCH_ERROR) | |
120 | return MATCH_ERROR; | |
121 | if (m == MATCH_NO) | |
122 | goto syntax; | |
123 | ||
124 | tail = gfc_get_data_variable (); | |
125 | *tail = var; | |
126 | ||
127 | parent->list = tail; | |
128 | ||
129 | for (;;) | |
130 | { | |
131 | if (gfc_match_char (',') != MATCH_YES) | |
132 | goto syntax; | |
133 | ||
134 | m = gfc_match_iterator (&parent->iter, 1); | |
135 | if (m == MATCH_YES) | |
136 | break; | |
137 | if (m == MATCH_ERROR) | |
138 | return MATCH_ERROR; | |
139 | ||
140 | m = var_element (&var); | |
141 | if (m == MATCH_ERROR) | |
142 | return MATCH_ERROR; | |
143 | if (m == MATCH_NO) | |
144 | goto syntax; | |
145 | ||
146 | tail->next = gfc_get_data_variable (); | |
147 | tail = tail->next; | |
148 | ||
149 | *tail = var; | |
150 | } | |
151 | ||
152 | if (gfc_match_char (')') != MATCH_YES) | |
153 | goto syntax; | |
154 | return MATCH_YES; | |
155 | ||
156 | syntax: | |
157 | gfc_syntax_error (ST_DATA); | |
158 | return MATCH_ERROR; | |
159 | } | |
160 | ||
161 | ||
162 | /* Match a single element in a data variable list, which can be a | |
163 | variable-iterator list. */ | |
164 | ||
165 | static match | |
166 | var_element (gfc_data_variable * new) | |
167 | { | |
168 | match m; | |
169 | gfc_symbol *sym; | |
170 | ||
171 | memset (new, 0, sizeof (gfc_data_variable)); | |
172 | ||
173 | if (gfc_match_char ('(') == MATCH_YES) | |
174 | return var_list (new); | |
175 | ||
176 | m = gfc_match_variable (&new->expr, 0); | |
177 | if (m != MATCH_YES) | |
178 | return m; | |
179 | ||
180 | sym = new->expr->symtree->n.sym; | |
181 | ||
182 | if(sym->value != NULL) | |
183 | { | |
184 | gfc_error ("Variable '%s' at %C already has an initialization", | |
185 | sym->name); | |
186 | return MATCH_ERROR; | |
187 | } | |
188 | ||
189 | #if 0 // TODO: Find out where to move this message | |
190 | if (sym->attr.in_common) | |
191 | /* See if sym is in the blank common block. */ | |
192 | for (t = &sym->ns->blank_common; t; t = t->common_next) | |
193 | if (sym == t->head) | |
194 | { | |
195 | gfc_error ("DATA statement at %C may not initialize variable " | |
196 | "'%s' from blank COMMON", sym->name); | |
197 | return MATCH_ERROR; | |
198 | } | |
199 | #endif | |
200 | ||
201 | if (gfc_add_data (&sym->attr, &new->expr->where) == FAILURE) | |
202 | return MATCH_ERROR; | |
203 | ||
204 | return MATCH_YES; | |
205 | } | |
206 | ||
207 | ||
208 | /* Match the top-level list of data variables. */ | |
209 | ||
210 | static match | |
211 | top_var_list (gfc_data * d) | |
212 | { | |
213 | gfc_data_variable var, *tail, *new; | |
214 | match m; | |
215 | ||
216 | tail = NULL; | |
217 | ||
218 | for (;;) | |
219 | { | |
220 | m = var_element (&var); | |
221 | if (m == MATCH_NO) | |
222 | goto syntax; | |
223 | if (m == MATCH_ERROR) | |
224 | return MATCH_ERROR; | |
225 | ||
226 | new = gfc_get_data_variable (); | |
227 | *new = var; | |
228 | ||
229 | if (tail == NULL) | |
230 | d->var = new; | |
231 | else | |
232 | tail->next = new; | |
233 | ||
234 | tail = new; | |
235 | ||
236 | if (gfc_match_char ('/') == MATCH_YES) | |
237 | break; | |
238 | if (gfc_match_char (',') != MATCH_YES) | |
239 | goto syntax; | |
240 | } | |
241 | ||
242 | return MATCH_YES; | |
243 | ||
244 | syntax: | |
245 | gfc_syntax_error (ST_DATA); | |
246 | return MATCH_ERROR; | |
247 | } | |
248 | ||
249 | ||
250 | static match | |
251 | match_data_constant (gfc_expr ** result) | |
252 | { | |
253 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
254 | gfc_symbol *sym; | |
255 | gfc_expr *expr; | |
256 | match m; | |
257 | ||
258 | m = gfc_match_literal_constant (&expr, 1); | |
259 | if (m == MATCH_YES) | |
260 | { | |
261 | *result = expr; | |
262 | return MATCH_YES; | |
263 | } | |
264 | ||
265 | if (m == MATCH_ERROR) | |
266 | return MATCH_ERROR; | |
267 | ||
268 | m = gfc_match_null (result); | |
269 | if (m != MATCH_NO) | |
270 | return m; | |
271 | ||
272 | m = gfc_match_name (name); | |
273 | if (m != MATCH_YES) | |
274 | return m; | |
275 | ||
276 | if (gfc_find_symbol (name, NULL, 1, &sym)) | |
277 | return MATCH_ERROR; | |
278 | ||
279 | if (sym == NULL | |
280 | || (sym->attr.flavor != FL_PARAMETER && sym->attr.flavor != FL_DERIVED)) | |
281 | { | |
282 | gfc_error ("Symbol '%s' must be a PARAMETER in DATA statement at %C", | |
283 | name); | |
284 | return MATCH_ERROR; | |
285 | } | |
286 | else if (sym->attr.flavor == FL_DERIVED) | |
287 | return gfc_match_structure_constructor (sym, result); | |
288 | ||
289 | *result = gfc_copy_expr (sym->value); | |
290 | return MATCH_YES; | |
291 | } | |
292 | ||
293 | ||
294 | /* Match a list of values in a DATA statement. The leading '/' has | |
295 | already been seen at this point. */ | |
296 | ||
297 | static match | |
298 | top_val_list (gfc_data * data) | |
299 | { | |
300 | gfc_data_value *new, *tail; | |
301 | gfc_expr *expr; | |
302 | const char *msg; | |
303 | match m; | |
304 | ||
305 | tail = NULL; | |
306 | ||
307 | for (;;) | |
308 | { | |
309 | m = match_data_constant (&expr); | |
310 | if (m == MATCH_NO) | |
311 | goto syntax; | |
312 | if (m == MATCH_ERROR) | |
313 | return MATCH_ERROR; | |
314 | ||
315 | new = gfc_get_data_value (); | |
316 | ||
317 | if (tail == NULL) | |
318 | data->value = new; | |
319 | else | |
320 | tail->next = new; | |
321 | ||
322 | tail = new; | |
323 | ||
324 | if (expr->ts.type != BT_INTEGER || gfc_match_char ('*') != MATCH_YES) | |
325 | { | |
326 | tail->expr = expr; | |
327 | tail->repeat = 1; | |
328 | } | |
329 | else | |
330 | { | |
331 | signed int tmp; | |
332 | msg = gfc_extract_int (expr, &tmp); | |
333 | gfc_free_expr (expr); | |
334 | if (msg != NULL) | |
335 | { | |
336 | gfc_error (msg); | |
337 | return MATCH_ERROR; | |
338 | } | |
339 | tail->repeat = tmp; | |
340 | ||
341 | m = match_data_constant (&tail->expr); | |
342 | if (m == MATCH_NO) | |
343 | goto syntax; | |
344 | if (m == MATCH_ERROR) | |
345 | return MATCH_ERROR; | |
346 | } | |
347 | ||
348 | if (gfc_match_char ('/') == MATCH_YES) | |
349 | break; | |
350 | if (gfc_match_char (',') == MATCH_NO) | |
351 | goto syntax; | |
352 | } | |
353 | ||
354 | return MATCH_YES; | |
355 | ||
356 | syntax: | |
357 | gfc_syntax_error (ST_DATA); | |
358 | return MATCH_ERROR; | |
359 | } | |
360 | ||
361 | ||
362 | /* Matches an old style initialization. */ | |
363 | ||
364 | static match | |
365 | match_old_style_init (const char *name) | |
366 | { | |
367 | match m; | |
368 | gfc_symtree *st; | |
369 | gfc_data *newdata; | |
370 | ||
371 | /* Set up data structure to hold initializers. */ | |
372 | gfc_find_sym_tree (name, NULL, 0, &st); | |
373 | ||
374 | newdata = gfc_get_data (); | |
375 | newdata->var = gfc_get_data_variable (); | |
376 | newdata->var->expr = gfc_get_variable_expr (st); | |
377 | ||
378 | /* Match initial value list. This also eats the terminal | |
379 | '/'. */ | |
380 | m = top_val_list (newdata); | |
381 | if (m != MATCH_YES) | |
382 | { | |
383 | gfc_free (newdata); | |
384 | return m; | |
385 | } | |
386 | ||
387 | if (gfc_pure (NULL)) | |
388 | { | |
389 | gfc_error ("Initialization at %C is not allowed in a PURE procedure"); | |
390 | gfc_free (newdata); | |
391 | return MATCH_ERROR; | |
392 | } | |
393 | ||
394 | /* Chain in namespace list of DATA initializers. */ | |
395 | newdata->next = gfc_current_ns->data; | |
396 | gfc_current_ns->data = newdata; | |
397 | ||
398 | return m; | |
399 | } | |
400 | ||
401 | /* Match the stuff following a DATA statement. If ERROR_FLAG is set, | |
13795658 | 402 | we are matching a DATA statement and are therefore issuing an error |
294fbfc8 | 403 | if we encounter something unexpected, if not, we're trying to match |
f7b529fa | 404 | an old-style intialization expression of the form INTEGER I /2/. */ |
294fbfc8 TS |
405 | |
406 | match | |
407 | gfc_match_data (void) | |
408 | { | |
409 | gfc_data *new; | |
410 | match m; | |
411 | ||
412 | for (;;) | |
413 | { | |
414 | new = gfc_get_data (); | |
415 | new->where = gfc_current_locus; | |
416 | ||
417 | m = top_var_list (new); | |
418 | if (m != MATCH_YES) | |
419 | goto cleanup; | |
420 | ||
421 | m = top_val_list (new); | |
422 | if (m != MATCH_YES) | |
423 | goto cleanup; | |
424 | ||
425 | new->next = gfc_current_ns->data; | |
426 | gfc_current_ns->data = new; | |
427 | ||
428 | if (gfc_match_eos () == MATCH_YES) | |
429 | break; | |
430 | ||
431 | gfc_match_char (','); /* Optional comma */ | |
432 | } | |
433 | ||
434 | if (gfc_pure (NULL)) | |
435 | { | |
436 | gfc_error ("DATA statement at %C is not allowed in a PURE procedure"); | |
437 | return MATCH_ERROR; | |
438 | } | |
439 | ||
440 | return MATCH_YES; | |
441 | ||
442 | cleanup: | |
443 | gfc_free_data (new); | |
444 | return MATCH_ERROR; | |
445 | } | |
446 | ||
447 | ||
448 | /************************ Declaration statements *********************/ | |
449 | ||
6de9cd9a DN |
450 | /* Match an intent specification. Since this can only happen after an |
451 | INTENT word, a legal intent-spec must follow. */ | |
452 | ||
453 | static sym_intent | |
454 | match_intent_spec (void) | |
455 | { | |
456 | ||
457 | if (gfc_match (" ( in out )") == MATCH_YES) | |
458 | return INTENT_INOUT; | |
459 | if (gfc_match (" ( in )") == MATCH_YES) | |
460 | return INTENT_IN; | |
461 | if (gfc_match (" ( out )") == MATCH_YES) | |
462 | return INTENT_OUT; | |
463 | ||
464 | gfc_error ("Bad INTENT specification at %C"); | |
465 | return INTENT_UNKNOWN; | |
466 | } | |
467 | ||
468 | ||
469 | /* Matches a character length specification, which is either a | |
470 | specification expression or a '*'. */ | |
471 | ||
472 | static match | |
473 | char_len_param_value (gfc_expr ** expr) | |
474 | { | |
475 | ||
476 | if (gfc_match_char ('*') == MATCH_YES) | |
477 | { | |
478 | *expr = NULL; | |
479 | return MATCH_YES; | |
480 | } | |
481 | ||
482 | return gfc_match_expr (expr); | |
483 | } | |
484 | ||
485 | ||
486 | /* A character length is a '*' followed by a literal integer or a | |
487 | char_len_param_value in parenthesis. */ | |
488 | ||
489 | static match | |
490 | match_char_length (gfc_expr ** expr) | |
491 | { | |
492 | int length; | |
493 | match m; | |
494 | ||
495 | m = gfc_match_char ('*'); | |
496 | if (m != MATCH_YES) | |
497 | return m; | |
498 | ||
499 | m = gfc_match_small_literal_int (&length); | |
500 | if (m == MATCH_ERROR) | |
501 | return m; | |
502 | ||
503 | if (m == MATCH_YES) | |
504 | { | |
505 | *expr = gfc_int_expr (length); | |
506 | return m; | |
507 | } | |
508 | ||
509 | if (gfc_match_char ('(') == MATCH_NO) | |
510 | goto syntax; | |
511 | ||
512 | m = char_len_param_value (expr); | |
513 | if (m == MATCH_ERROR) | |
514 | return m; | |
515 | if (m == MATCH_NO) | |
516 | goto syntax; | |
517 | ||
518 | if (gfc_match_char (')') == MATCH_NO) | |
519 | { | |
520 | gfc_free_expr (*expr); | |
521 | *expr = NULL; | |
522 | goto syntax; | |
523 | } | |
524 | ||
525 | return MATCH_YES; | |
526 | ||
527 | syntax: | |
528 | gfc_error ("Syntax error in character length specification at %C"); | |
529 | return MATCH_ERROR; | |
530 | } | |
531 | ||
532 | ||
533 | /* Special subroutine for finding a symbol. If we're compiling a | |
534 | function or subroutine and the parent compilation unit is an | |
535 | interface, then check to see if the name we've been given is the | |
536 | name of the interface (located in another namespace). If so, | |
537 | return that symbol. If not, use gfc_get_symbol(). */ | |
538 | ||
539 | static int | |
540 | find_special (const char *name, gfc_symbol ** result) | |
541 | { | |
542 | gfc_state_data *s; | |
543 | ||
544 | if (gfc_current_state () != COMP_SUBROUTINE | |
545 | && gfc_current_state () != COMP_FUNCTION) | |
546 | goto normal; | |
547 | ||
548 | s = gfc_state_stack->previous; | |
549 | if (s == NULL) | |
550 | goto normal; | |
551 | ||
552 | if (s->state != COMP_INTERFACE) | |
553 | goto normal; | |
554 | if (s->sym == NULL) | |
555 | goto normal; /* Nameless interface */ | |
556 | ||
557 | if (strcmp (name, s->sym->name) == 0) | |
558 | { | |
559 | *result = s->sym; | |
560 | return 0; | |
561 | } | |
562 | ||
563 | normal: | |
564 | return gfc_get_symbol (name, NULL, result); | |
565 | } | |
566 | ||
567 | ||
568 | /* Special subroutine for getting a symbol node associated with a | |
569 | procedure name, used in SUBROUTINE and FUNCTION statements. The | |
570 | symbol is created in the parent using with symtree node in the | |
571 | child unit pointing to the symbol. If the current namespace has no | |
572 | parent, then the symbol is just created in the current unit. */ | |
573 | ||
574 | static int | |
575 | get_proc_name (const char *name, gfc_symbol ** result) | |
576 | { | |
577 | gfc_symtree *st; | |
578 | gfc_symbol *sym; | |
579 | int rc; | |
580 | ||
581 | if (gfc_current_ns->parent == NULL) | |
582 | return gfc_get_symbol (name, NULL, result); | |
583 | ||
584 | rc = gfc_get_symbol (name, gfc_current_ns->parent, result); | |
585 | if (*result == NULL) | |
586 | return rc; | |
587 | ||
3d79abbd | 588 | /* ??? Deal with ENTRY problem */ |
6de9cd9a DN |
589 | |
590 | st = gfc_new_symtree (&gfc_current_ns->sym_root, name); | |
591 | ||
592 | sym = *result; | |
593 | st->n.sym = sym; | |
594 | sym->refs++; | |
595 | ||
596 | /* See if the procedure should be a module procedure */ | |
597 | ||
598 | if (sym->ns->proc_name != NULL | |
599 | && sym->ns->proc_name->attr.flavor == FL_MODULE | |
600 | && sym->attr.proc != PROC_MODULE | |
601 | && gfc_add_procedure (&sym->attr, PROC_MODULE, NULL) == FAILURE) | |
602 | rc = 2; | |
603 | ||
604 | return rc; | |
605 | } | |
606 | ||
607 | ||
608 | /* Function called by variable_decl() that adds a name to the symbol | |
609 | table. */ | |
610 | ||
611 | static try | |
612 | build_sym (const char *name, gfc_charlen * cl, | |
613 | gfc_array_spec ** as, locus * var_locus) | |
614 | { | |
615 | symbol_attribute attr; | |
616 | gfc_symbol *sym; | |
617 | ||
618 | if (find_special (name, &sym)) | |
619 | return FAILURE; | |
620 | ||
621 | /* Start updating the symbol table. Add basic type attribute | |
622 | if present. */ | |
623 | if (current_ts.type != BT_UNKNOWN | |
624 | &&(sym->attr.implicit_type == 0 | |
625 | || !gfc_compare_types (&sym->ts, ¤t_ts)) | |
626 | && gfc_add_type (sym, ¤t_ts, var_locus) == FAILURE) | |
627 | return FAILURE; | |
628 | ||
629 | if (sym->ts.type == BT_CHARACTER) | |
630 | sym->ts.cl = cl; | |
631 | ||
632 | /* Add dimension attribute if present. */ | |
633 | if (gfc_set_array_spec (sym, *as, var_locus) == FAILURE) | |
634 | return FAILURE; | |
635 | *as = NULL; | |
636 | ||
637 | /* Add attribute to symbol. The copy is so that we can reset the | |
638 | dimension attribute. */ | |
639 | attr = current_attr; | |
640 | attr.dimension = 0; | |
641 | ||
642 | if (gfc_copy_attr (&sym->attr, &attr, var_locus) == FAILURE) | |
643 | return FAILURE; | |
644 | ||
645 | return SUCCESS; | |
646 | } | |
647 | ||
648 | ||
649 | /* Function called by variable_decl() that adds an initialization | |
650 | expression to a symbol. */ | |
651 | ||
652 | static try | |
653 | add_init_expr_to_sym (const char *name, gfc_expr ** initp, | |
654 | locus * var_locus) | |
655 | { | |
656 | symbol_attribute attr; | |
657 | gfc_symbol *sym; | |
658 | gfc_expr *init; | |
659 | ||
660 | init = *initp; | |
661 | if (find_special (name, &sym)) | |
662 | return FAILURE; | |
663 | ||
664 | attr = sym->attr; | |
665 | ||
666 | /* If this symbol is confirming an implicit parameter type, | |
667 | then an initialization expression is not allowed. */ | |
668 | if (attr.flavor == FL_PARAMETER | |
669 | && sym->value != NULL | |
670 | && *initp != NULL) | |
671 | { | |
672 | gfc_error ("Initializer not allowed for PARAMETER '%s' at %C", | |
673 | sym->name); | |
674 | return FAILURE; | |
675 | } | |
676 | ||
c8e20bd0 TS |
677 | if (attr.in_common |
678 | && !attr.data | |
679 | && *initp != NULL) | |
680 | { | |
681 | gfc_error ("Initializer not allowed for COMMON variable '%s' at %C", | |
682 | sym->name); | |
683 | return FAILURE; | |
684 | } | |
685 | ||
6de9cd9a DN |
686 | if (init == NULL) |
687 | { | |
688 | /* An initializer is required for PARAMETER declarations. */ | |
689 | if (attr.flavor == FL_PARAMETER) | |
690 | { | |
691 | gfc_error ("PARAMETER at %L is missing an initializer", var_locus); | |
692 | return FAILURE; | |
693 | } | |
694 | } | |
695 | else | |
696 | { | |
697 | /* If a variable appears in a DATA block, it cannot have an | |
1de8a836 | 698 | initializer. */ |
6de9cd9a DN |
699 | if (sym->attr.data) |
700 | { | |
701 | gfc_error | |
702 | ("Variable '%s' at %C with an initializer already appears " | |
703 | "in a DATA statement", sym->name); | |
704 | return FAILURE; | |
705 | } | |
706 | ||
75d17889 TS |
707 | /* Check if the assignment can happen. This has to be put off |
708 | until later for a derived type variable. */ | |
6de9cd9a DN |
709 | if (sym->ts.type != BT_DERIVED && init->ts.type != BT_DERIVED |
710 | && gfc_check_assign_symbol (sym, init) == FAILURE) | |
711 | return FAILURE; | |
712 | ||
713 | /* Add initializer. Make sure we keep the ranks sane. */ | |
714 | if (sym->attr.dimension && init->rank == 0) | |
715 | init->rank = sym->as->rank; | |
716 | ||
717 | sym->value = init; | |
718 | *initp = NULL; | |
719 | } | |
720 | ||
721 | return SUCCESS; | |
722 | } | |
723 | ||
724 | ||
725 | /* Function called by variable_decl() that adds a name to a structure | |
726 | being built. */ | |
727 | ||
728 | static try | |
729 | build_struct (const char *name, gfc_charlen * cl, gfc_expr ** init, | |
730 | gfc_array_spec ** as) | |
731 | { | |
732 | gfc_component *c; | |
733 | ||
734 | /* If the current symbol is of the same derived type that we're | |
735 | constructing, it must have the pointer attribute. */ | |
736 | if (current_ts.type == BT_DERIVED | |
737 | && current_ts.derived == gfc_current_block () | |
738 | && current_attr.pointer == 0) | |
739 | { | |
740 | gfc_error ("Component at %C must have the POINTER attribute"); | |
741 | return FAILURE; | |
742 | } | |
743 | ||
744 | if (gfc_current_block ()->attr.pointer | |
745 | && (*as)->rank != 0) | |
746 | { | |
747 | if ((*as)->type != AS_DEFERRED && (*as)->type != AS_EXPLICIT) | |
748 | { | |
749 | gfc_error ("Array component of structure at %C must have explicit " | |
750 | "or deferred shape"); | |
751 | return FAILURE; | |
752 | } | |
753 | } | |
754 | ||
755 | if (gfc_add_component (gfc_current_block (), name, &c) == FAILURE) | |
756 | return FAILURE; | |
757 | ||
758 | c->ts = current_ts; | |
759 | c->ts.cl = cl; | |
760 | gfc_set_component_attr (c, ¤t_attr); | |
761 | ||
762 | c->initializer = *init; | |
763 | *init = NULL; | |
764 | ||
765 | c->as = *as; | |
766 | if (c->as != NULL) | |
767 | c->dimension = 1; | |
768 | *as = NULL; | |
769 | ||
770 | /* Check array components. */ | |
771 | if (!c->dimension) | |
772 | return SUCCESS; | |
773 | ||
774 | if (c->pointer) | |
775 | { | |
776 | if (c->as->type != AS_DEFERRED) | |
777 | { | |
778 | gfc_error ("Pointer array component of structure at %C " | |
779 | "must have a deferred shape"); | |
780 | return FAILURE; | |
781 | } | |
782 | } | |
783 | else | |
784 | { | |
785 | if (c->as->type != AS_EXPLICIT) | |
786 | { | |
787 | gfc_error | |
788 | ("Array component of structure at %C must have an explicit " | |
789 | "shape"); | |
790 | return FAILURE; | |
791 | } | |
792 | } | |
793 | ||
794 | return SUCCESS; | |
795 | } | |
796 | ||
797 | ||
798 | /* Match a 'NULL()', and possibly take care of some side effects. */ | |
799 | ||
800 | match | |
801 | gfc_match_null (gfc_expr ** result) | |
802 | { | |
803 | gfc_symbol *sym; | |
804 | gfc_expr *e; | |
805 | match m; | |
806 | ||
807 | m = gfc_match (" null ( )"); | |
808 | if (m != MATCH_YES) | |
809 | return m; | |
810 | ||
811 | /* The NULL symbol now has to be/become an intrinsic function. */ | |
812 | if (gfc_get_symbol ("null", NULL, &sym)) | |
813 | { | |
814 | gfc_error ("NULL() initialization at %C is ambiguous"); | |
815 | return MATCH_ERROR; | |
816 | } | |
817 | ||
818 | gfc_intrinsic_symbol (sym); | |
819 | ||
820 | if (sym->attr.proc != PROC_INTRINSIC | |
821 | && (gfc_add_procedure (&sym->attr, PROC_INTRINSIC, NULL) == FAILURE | |
822 | || gfc_add_function (&sym->attr, NULL) == FAILURE)) | |
823 | return MATCH_ERROR; | |
824 | ||
825 | e = gfc_get_expr (); | |
63645982 | 826 | e->where = gfc_current_locus; |
6de9cd9a DN |
827 | e->expr_type = EXPR_NULL; |
828 | e->ts.type = BT_UNKNOWN; | |
829 | ||
830 | *result = e; | |
831 | ||
832 | return MATCH_YES; | |
833 | } | |
834 | ||
835 | ||
6de9cd9a DN |
836 | /* Match a variable name with an optional initializer. When this |
837 | subroutine is called, a variable is expected to be parsed next. | |
838 | Depending on what is happening at the moment, updates either the | |
839 | symbol table or the current interface. */ | |
840 | ||
841 | static match | |
842 | variable_decl (void) | |
843 | { | |
844 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
845 | gfc_expr *initializer, *char_len; | |
846 | gfc_array_spec *as; | |
847 | gfc_charlen *cl; | |
848 | locus var_locus; | |
849 | match m; | |
850 | try t; | |
851 | ||
852 | initializer = NULL; | |
853 | as = NULL; | |
854 | ||
855 | /* When we get here, we've just matched a list of attributes and | |
856 | maybe a type and a double colon. The next thing we expect to see | |
857 | is the name of the symbol. */ | |
858 | m = gfc_match_name (name); | |
859 | if (m != MATCH_YES) | |
860 | goto cleanup; | |
861 | ||
63645982 | 862 | var_locus = gfc_current_locus; |
6de9cd9a DN |
863 | |
864 | /* Now we could see the optional array spec. or character length. */ | |
865 | m = gfc_match_array_spec (&as); | |
866 | if (m == MATCH_ERROR) | |
867 | goto cleanup; | |
868 | if (m == MATCH_NO) | |
869 | as = gfc_copy_array_spec (current_as); | |
870 | ||
871 | char_len = NULL; | |
872 | cl = NULL; | |
873 | ||
874 | if (current_ts.type == BT_CHARACTER) | |
875 | { | |
876 | switch (match_char_length (&char_len)) | |
877 | { | |
878 | case MATCH_YES: | |
879 | cl = gfc_get_charlen (); | |
880 | cl->next = gfc_current_ns->cl_list; | |
881 | gfc_current_ns->cl_list = cl; | |
882 | ||
883 | cl->length = char_len; | |
884 | break; | |
885 | ||
886 | case MATCH_NO: | |
887 | cl = current_ts.cl; | |
888 | break; | |
889 | ||
890 | case MATCH_ERROR: | |
891 | goto cleanup; | |
892 | } | |
893 | } | |
894 | ||
895 | /* OK, we've successfully matched the declaration. Now put the | |
896 | symbol in the current namespace, because it might be used in the | |
897 | optional intialization expression for this symbol, e.g. this is | |
898 | perfectly legal: | |
899 | ||
900 | integer, parameter :: i = huge(i) | |
901 | ||
902 | This is only true for parameters or variables of a basic type. | |
903 | For components of derived types, it is not true, so we don't | |
904 | create a symbol for those yet. If we fail to create the symbol, | |
905 | bail out. */ | |
906 | if (gfc_current_state () != COMP_DERIVED | |
907 | && build_sym (name, cl, &as, &var_locus) == FAILURE) | |
908 | { | |
909 | m = MATCH_ERROR; | |
910 | goto cleanup; | |
911 | } | |
912 | ||
913 | /* In functions that have a RESULT variable defined, the function | |
914 | name always refers to function calls. Therefore, the name is | |
915 | not allowed to appear in specification statements. */ | |
916 | if (gfc_current_state () == COMP_FUNCTION | |
917 | && gfc_current_block () != NULL | |
918 | && gfc_current_block ()->result != NULL | |
919 | && gfc_current_block ()->result != gfc_current_block () | |
920 | && strcmp (gfc_current_block ()->name, name) == 0) | |
921 | { | |
922 | gfc_error ("Function name '%s' not allowed at %C", name); | |
923 | m = MATCH_ERROR; | |
924 | goto cleanup; | |
925 | } | |
926 | ||
294fbfc8 TS |
927 | /* We allow old-style initializations of the form |
928 | integer i /2/, j(4) /3*3, 1/ | |
929 | (if no colon has been seen). These are different from data | |
930 | statements in that initializers are only allowed to apply to the | |
931 | variable immediately preceding, i.e. | |
932 | integer i, j /1, 2/ | |
933 | is not allowed. Therefore we have to do some work manually, that | |
75d17889 | 934 | could otherwise be left to the matchers for DATA statements. */ |
294fbfc8 TS |
935 | |
936 | if (!colon_seen && gfc_match (" /") == MATCH_YES) | |
937 | { | |
938 | if (gfc_notify_std (GFC_STD_GNU, "Extension: Old-style " | |
939 | "initialization at %C") == FAILURE) | |
940 | return MATCH_ERROR; | |
941 | ||
942 | return match_old_style_init (name); | |
943 | } | |
944 | ||
6de9cd9a DN |
945 | /* The double colon must be present in order to have initializers. |
946 | Otherwise the statement is ambiguous with an assignment statement. */ | |
947 | if (colon_seen) | |
948 | { | |
949 | if (gfc_match (" =>") == MATCH_YES) | |
950 | { | |
951 | ||
952 | if (!current_attr.pointer) | |
953 | { | |
954 | gfc_error ("Initialization at %C isn't for a pointer variable"); | |
955 | m = MATCH_ERROR; | |
956 | goto cleanup; | |
957 | } | |
958 | ||
959 | m = gfc_match_null (&initializer); | |
960 | if (m == MATCH_NO) | |
961 | { | |
962 | gfc_error ("Pointer initialization requires a NULL at %C"); | |
963 | m = MATCH_ERROR; | |
964 | } | |
965 | ||
966 | if (gfc_pure (NULL)) | |
967 | { | |
968 | gfc_error | |
969 | ("Initialization of pointer at %C is not allowed in a " | |
970 | "PURE procedure"); | |
971 | m = MATCH_ERROR; | |
972 | } | |
973 | ||
974 | if (m != MATCH_YES) | |
975 | goto cleanup; | |
976 | ||
977 | initializer->ts = current_ts; | |
978 | ||
979 | } | |
980 | else if (gfc_match_char ('=') == MATCH_YES) | |
981 | { | |
982 | if (current_attr.pointer) | |
983 | { | |
984 | gfc_error | |
985 | ("Pointer initialization at %C requires '=>', not '='"); | |
986 | m = MATCH_ERROR; | |
987 | goto cleanup; | |
988 | } | |
989 | ||
990 | m = gfc_match_init_expr (&initializer); | |
991 | if (m == MATCH_NO) | |
992 | { | |
993 | gfc_error ("Expected an initialization expression at %C"); | |
994 | m = MATCH_ERROR; | |
995 | } | |
996 | ||
997 | if (current_attr.flavor != FL_PARAMETER && gfc_pure (NULL)) | |
998 | { | |
999 | gfc_error | |
1000 | ("Initialization of variable at %C is not allowed in a " | |
1001 | "PURE procedure"); | |
1002 | m = MATCH_ERROR; | |
1003 | } | |
1004 | ||
1005 | if (m != MATCH_YES) | |
1006 | goto cleanup; | |
1007 | } | |
cb44ab82 VL |
1008 | } |
1009 | ||
54b4ba60 | 1010 | /* Add the initializer. Note that it is fine if initializer is |
6de9cd9a DN |
1011 | NULL here, because we sometimes also need to check if a |
1012 | declaration *must* have an initialization expression. */ | |
1013 | if (gfc_current_state () != COMP_DERIVED) | |
1014 | t = add_init_expr_to_sym (name, &initializer, &var_locus); | |
1015 | else | |
54b4ba60 PB |
1016 | { |
1017 | if (current_ts.type == BT_DERIVED && !initializer) | |
1018 | initializer = gfc_default_initializer (¤t_ts); | |
1019 | t = build_struct (name, cl, &initializer, &as); | |
1020 | } | |
6de9cd9a DN |
1021 | |
1022 | m = (t == SUCCESS) ? MATCH_YES : MATCH_ERROR; | |
1023 | ||
1024 | cleanup: | |
1025 | /* Free stuff up and return. */ | |
1026 | gfc_free_expr (initializer); | |
1027 | gfc_free_array_spec (as); | |
1028 | ||
1029 | return m; | |
1030 | } | |
1031 | ||
1032 | ||
1033 | /* Match an extended-f77 kind specification. */ | |
1034 | ||
1035 | match | |
1036 | gfc_match_old_kind_spec (gfc_typespec * ts) | |
1037 | { | |
1038 | match m; | |
1039 | ||
1040 | if (gfc_match_char ('*') != MATCH_YES) | |
1041 | return MATCH_NO; | |
1042 | ||
1043 | m = gfc_match_small_literal_int (&ts->kind); | |
1044 | if (m != MATCH_YES) | |
1045 | return MATCH_ERROR; | |
1046 | ||
1047 | /* Massage the kind numbers for complex types. */ | |
1048 | if (ts->type == BT_COMPLEX && ts->kind == 8) | |
1049 | ts->kind = 4; | |
1050 | if (ts->type == BT_COMPLEX && ts->kind == 16) | |
1051 | ts->kind = 8; | |
1052 | ||
e7a2d5fb | 1053 | if (gfc_validate_kind (ts->type, ts->kind, true) < 0) |
6de9cd9a DN |
1054 | { |
1055 | gfc_error ("Old-style kind %d not supported for type %s at %C", | |
1056 | ts->kind, gfc_basic_typename (ts->type)); | |
1057 | ||
1058 | return MATCH_ERROR; | |
1059 | } | |
1060 | ||
1061 | return MATCH_YES; | |
1062 | } | |
1063 | ||
1064 | ||
1065 | /* Match a kind specification. Since kinds are generally optional, we | |
1066 | usually return MATCH_NO if something goes wrong. If a "kind=" | |
1067 | string is found, then we know we have an error. */ | |
1068 | ||
1069 | match | |
1070 | gfc_match_kind_spec (gfc_typespec * ts) | |
1071 | { | |
1072 | locus where; | |
1073 | gfc_expr *e; | |
1074 | match m, n; | |
1075 | const char *msg; | |
1076 | ||
1077 | m = MATCH_NO; | |
1078 | e = NULL; | |
1079 | ||
63645982 | 1080 | where = gfc_current_locus; |
6de9cd9a DN |
1081 | |
1082 | if (gfc_match_char ('(') == MATCH_NO) | |
1083 | return MATCH_NO; | |
1084 | ||
1085 | /* Also gobbles optional text. */ | |
1086 | if (gfc_match (" kind = ") == MATCH_YES) | |
1087 | m = MATCH_ERROR; | |
1088 | ||
1089 | n = gfc_match_init_expr (&e); | |
1090 | if (n == MATCH_NO) | |
1091 | gfc_error ("Expected initialization expression at %C"); | |
1092 | if (n != MATCH_YES) | |
1093 | return MATCH_ERROR; | |
1094 | ||
1095 | if (e->rank != 0) | |
1096 | { | |
1097 | gfc_error ("Expected scalar initialization expression at %C"); | |
1098 | m = MATCH_ERROR; | |
1099 | goto no_match; | |
1100 | } | |
1101 | ||
1102 | msg = gfc_extract_int (e, &ts->kind); | |
1103 | if (msg != NULL) | |
1104 | { | |
1105 | gfc_error (msg); | |
1106 | m = MATCH_ERROR; | |
1107 | goto no_match; | |
1108 | } | |
1109 | ||
1110 | gfc_free_expr (e); | |
1111 | e = NULL; | |
1112 | ||
e7a2d5fb | 1113 | if (gfc_validate_kind (ts->type, ts->kind, true) < 0) |
6de9cd9a DN |
1114 | { |
1115 | gfc_error ("Kind %d not supported for type %s at %C", ts->kind, | |
1116 | gfc_basic_typename (ts->type)); | |
1117 | ||
1118 | m = MATCH_ERROR; | |
1119 | goto no_match; | |
1120 | } | |
1121 | ||
1122 | if (gfc_match_char (')') != MATCH_YES) | |
1123 | { | |
1124 | gfc_error ("Missing right paren at %C"); | |
1125 | goto no_match; | |
1126 | } | |
1127 | ||
1128 | return MATCH_YES; | |
1129 | ||
1130 | no_match: | |
1131 | gfc_free_expr (e); | |
63645982 | 1132 | gfc_current_locus = where; |
6de9cd9a DN |
1133 | return m; |
1134 | } | |
1135 | ||
1136 | ||
1137 | /* Match the various kind/length specifications in a CHARACTER | |
1138 | declaration. We don't return MATCH_NO. */ | |
1139 | ||
1140 | static match | |
1141 | match_char_spec (gfc_typespec * ts) | |
1142 | { | |
1143 | int i, kind, seen_length; | |
1144 | gfc_charlen *cl; | |
1145 | gfc_expr *len; | |
1146 | match m; | |
1147 | ||
9d64df18 | 1148 | kind = gfc_default_character_kind; |
6de9cd9a DN |
1149 | len = NULL; |
1150 | seen_length = 0; | |
1151 | ||
1152 | /* Try the old-style specification first. */ | |
1153 | old_char_selector = 0; | |
1154 | ||
1155 | m = match_char_length (&len); | |
1156 | if (m != MATCH_NO) | |
1157 | { | |
1158 | if (m == MATCH_YES) | |
1159 | old_char_selector = 1; | |
1160 | seen_length = 1; | |
1161 | goto done; | |
1162 | } | |
1163 | ||
1164 | m = gfc_match_char ('('); | |
1165 | if (m != MATCH_YES) | |
1166 | { | |
1167 | m = MATCH_YES; /* character without length is a single char */ | |
1168 | goto done; | |
1169 | } | |
1170 | ||
1171 | /* Try the weird case: ( KIND = <int> [ , LEN = <len-param> ] ) */ | |
1172 | if (gfc_match (" kind =") == MATCH_YES) | |
1173 | { | |
1174 | m = gfc_match_small_int (&kind); | |
1175 | if (m == MATCH_ERROR) | |
1176 | goto done; | |
1177 | if (m == MATCH_NO) | |
1178 | goto syntax; | |
1179 | ||
1180 | if (gfc_match (" , len =") == MATCH_NO) | |
1181 | goto rparen; | |
1182 | ||
1183 | m = char_len_param_value (&len); | |
1184 | if (m == MATCH_NO) | |
1185 | goto syntax; | |
1186 | if (m == MATCH_ERROR) | |
1187 | goto done; | |
1188 | seen_length = 1; | |
1189 | ||
1190 | goto rparen; | |
1191 | } | |
1192 | ||
1193 | /* Try to match ( LEN = <len-param> ) or ( LEN = <len-param>, KIND = <int> ) */ | |
1194 | if (gfc_match (" len =") == MATCH_YES) | |
1195 | { | |
1196 | m = char_len_param_value (&len); | |
1197 | if (m == MATCH_NO) | |
1198 | goto syntax; | |
1199 | if (m == MATCH_ERROR) | |
1200 | goto done; | |
1201 | seen_length = 1; | |
1202 | ||
1203 | if (gfc_match_char (')') == MATCH_YES) | |
1204 | goto done; | |
1205 | ||
1206 | if (gfc_match (" , kind =") != MATCH_YES) | |
1207 | goto syntax; | |
1208 | ||
1209 | gfc_match_small_int (&kind); | |
1210 | ||
e7a2d5fb | 1211 | if (gfc_validate_kind (BT_CHARACTER, kind, true) < 0) |
6de9cd9a DN |
1212 | { |
1213 | gfc_error ("Kind %d is not a CHARACTER kind at %C", kind); | |
1214 | return MATCH_YES; | |
1215 | } | |
1216 | ||
1217 | goto rparen; | |
1218 | } | |
1219 | ||
1220 | /* Try to match ( <len-param> ) or ( <len-param> , [ KIND = ] <int> ) */ | |
1221 | m = char_len_param_value (&len); | |
1222 | if (m == MATCH_NO) | |
1223 | goto syntax; | |
1224 | if (m == MATCH_ERROR) | |
1225 | goto done; | |
1226 | seen_length = 1; | |
1227 | ||
1228 | m = gfc_match_char (')'); | |
1229 | if (m == MATCH_YES) | |
1230 | goto done; | |
1231 | ||
1232 | if (gfc_match_char (',') != MATCH_YES) | |
1233 | goto syntax; | |
1234 | ||
1235 | gfc_match (" kind ="); /* Gobble optional text */ | |
1236 | ||
1237 | m = gfc_match_small_int (&kind); | |
1238 | if (m == MATCH_ERROR) | |
1239 | goto done; | |
1240 | if (m == MATCH_NO) | |
1241 | goto syntax; | |
1242 | ||
1243 | rparen: | |
1244 | /* Require a right-paren at this point. */ | |
1245 | m = gfc_match_char (')'); | |
1246 | if (m == MATCH_YES) | |
1247 | goto done; | |
1248 | ||
1249 | syntax: | |
1250 | gfc_error ("Syntax error in CHARACTER declaration at %C"); | |
1251 | m = MATCH_ERROR; | |
1252 | ||
1253 | done: | |
e7a2d5fb | 1254 | if (m == MATCH_YES && gfc_validate_kind (BT_CHARACTER, kind, true) < 0) |
6de9cd9a DN |
1255 | { |
1256 | gfc_error ("Kind %d is not a CHARACTER kind at %C", kind); | |
1257 | m = MATCH_ERROR; | |
1258 | } | |
1259 | ||
1260 | if (m != MATCH_YES) | |
1261 | { | |
1262 | gfc_free_expr (len); | |
1263 | return m; | |
1264 | } | |
1265 | ||
1266 | /* Do some final massaging of the length values. */ | |
1267 | cl = gfc_get_charlen (); | |
1268 | cl->next = gfc_current_ns->cl_list; | |
1269 | gfc_current_ns->cl_list = cl; | |
1270 | ||
1271 | if (seen_length == 0) | |
1272 | cl->length = gfc_int_expr (1); | |
1273 | else | |
1274 | { | |
1275 | if (len == NULL || gfc_extract_int (len, &i) != NULL || i >= 0) | |
1276 | cl->length = len; | |
1277 | else | |
1278 | { | |
1279 | gfc_free_expr (len); | |
1280 | cl->length = gfc_int_expr (0); | |
1281 | } | |
1282 | } | |
1283 | ||
1284 | ts->cl = cl; | |
1285 | ts->kind = kind; | |
1286 | ||
1287 | return MATCH_YES; | |
1288 | } | |
1289 | ||
1290 | ||
1291 | /* Matches a type specification. If successful, sets the ts structure | |
1292 | to the matched specification. This is necessary for FUNCTION and | |
1293 | IMPLICIT statements. | |
1294 | ||
e5ddaa24 TS |
1295 | If implicit_flag is nonzero, then we don't check for the optional |
1296 | kind specification. Not doing so is needed for matching an IMPLICIT | |
6de9cd9a DN |
1297 | statement correctly. */ |
1298 | ||
e5ddaa24 TS |
1299 | static match |
1300 | match_type_spec (gfc_typespec * ts, int implicit_flag) | |
6de9cd9a DN |
1301 | { |
1302 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
1303 | gfc_symbol *sym; | |
1304 | match m; | |
0ff0dfbf | 1305 | int c; |
6de9cd9a DN |
1306 | |
1307 | gfc_clear_ts (ts); | |
1308 | ||
1309 | if (gfc_match (" integer") == MATCH_YES) | |
1310 | { | |
1311 | ts->type = BT_INTEGER; | |
9d64df18 | 1312 | ts->kind = gfc_default_integer_kind; |
6de9cd9a DN |
1313 | goto get_kind; |
1314 | } | |
1315 | ||
1316 | if (gfc_match (" character") == MATCH_YES) | |
1317 | { | |
1318 | ts->type = BT_CHARACTER; | |
e5ddaa24 TS |
1319 | if (implicit_flag == 0) |
1320 | return match_char_spec (ts); | |
1321 | else | |
1322 | return MATCH_YES; | |
6de9cd9a DN |
1323 | } |
1324 | ||
1325 | if (gfc_match (" real") == MATCH_YES) | |
1326 | { | |
1327 | ts->type = BT_REAL; | |
9d64df18 | 1328 | ts->kind = gfc_default_real_kind; |
6de9cd9a DN |
1329 | goto get_kind; |
1330 | } | |
1331 | ||
1332 | if (gfc_match (" double precision") == MATCH_YES) | |
1333 | { | |
1334 | ts->type = BT_REAL; | |
9d64df18 | 1335 | ts->kind = gfc_default_double_kind; |
6de9cd9a DN |
1336 | return MATCH_YES; |
1337 | } | |
1338 | ||
1339 | if (gfc_match (" complex") == MATCH_YES) | |
1340 | { | |
1341 | ts->type = BT_COMPLEX; | |
9d64df18 | 1342 | ts->kind = gfc_default_complex_kind; |
6de9cd9a DN |
1343 | goto get_kind; |
1344 | } | |
1345 | ||
1346 | if (gfc_match (" double complex") == MATCH_YES) | |
1347 | { | |
1348 | ts->type = BT_COMPLEX; | |
9d64df18 | 1349 | ts->kind = gfc_default_double_kind; |
6de9cd9a DN |
1350 | return MATCH_YES; |
1351 | } | |
1352 | ||
1353 | if (gfc_match (" logical") == MATCH_YES) | |
1354 | { | |
1355 | ts->type = BT_LOGICAL; | |
9d64df18 | 1356 | ts->kind = gfc_default_logical_kind; |
6de9cd9a DN |
1357 | goto get_kind; |
1358 | } | |
1359 | ||
1360 | m = gfc_match (" type ( %n )", name); | |
1361 | if (m != MATCH_YES) | |
1362 | return m; | |
1363 | ||
1364 | /* Search for the name but allow the components to be defined later. */ | |
1365 | if (gfc_get_ha_symbol (name, &sym)) | |
1366 | { | |
1367 | gfc_error ("Type name '%s' at %C is ambiguous", name); | |
1368 | return MATCH_ERROR; | |
1369 | } | |
1370 | ||
1371 | if (sym->attr.flavor != FL_DERIVED | |
1372 | && gfc_add_flavor (&sym->attr, FL_DERIVED, NULL) == FAILURE) | |
1373 | return MATCH_ERROR; | |
1374 | ||
1375 | ts->type = BT_DERIVED; | |
1376 | ts->kind = 0; | |
1377 | ts->derived = sym; | |
1378 | ||
1379 | return MATCH_YES; | |
1380 | ||
1381 | get_kind: | |
1382 | /* For all types except double, derived and character, look for an | |
1383 | optional kind specifier. MATCH_NO is actually OK at this point. */ | |
e5ddaa24 | 1384 | if (implicit_flag == 1) |
6de9cd9a DN |
1385 | return MATCH_YES; |
1386 | ||
0ff0dfbf TS |
1387 | if (gfc_current_form == FORM_FREE) |
1388 | { | |
1389 | c = gfc_peek_char(); | |
1390 | if (!gfc_is_whitespace(c) && c != '*' && c != '(' | |
1391 | && c != ':' && c != ',') | |
1392 | return MATCH_NO; | |
1393 | } | |
1394 | ||
6de9cd9a DN |
1395 | m = gfc_match_kind_spec (ts); |
1396 | if (m == MATCH_NO && ts->type != BT_CHARACTER) | |
1397 | m = gfc_match_old_kind_spec (ts); | |
1398 | ||
1399 | if (m == MATCH_NO) | |
1400 | m = MATCH_YES; /* No kind specifier found. */ | |
1401 | ||
1402 | return m; | |
1403 | } | |
1404 | ||
1405 | ||
e5ddaa24 TS |
1406 | /* Match an IMPLICIT NONE statement. Actually, this statement is |
1407 | already matched in parse.c, or we would not end up here in the | |
1408 | first place. So the only thing we need to check, is if there is | |
1409 | trailing garbage. If not, the match is successful. */ | |
1410 | ||
1411 | match | |
1412 | gfc_match_implicit_none (void) | |
1413 | { | |
1414 | ||
1415 | return (gfc_match_eos () == MATCH_YES) ? MATCH_YES : MATCH_NO; | |
1416 | } | |
1417 | ||
1418 | ||
1419 | /* Match the letter range(s) of an IMPLICIT statement. */ | |
1420 | ||
1421 | static match | |
1107b970 | 1422 | match_implicit_range (void) |
e5ddaa24 TS |
1423 | { |
1424 | int c, c1, c2, inner; | |
1425 | locus cur_loc; | |
1426 | ||
1427 | cur_loc = gfc_current_locus; | |
1428 | ||
1429 | gfc_gobble_whitespace (); | |
1430 | c = gfc_next_char (); | |
1431 | if (c != '(') | |
1432 | { | |
1433 | gfc_error ("Missing character range in IMPLICIT at %C"); | |
1434 | goto bad; | |
1435 | } | |
1436 | ||
1437 | inner = 1; | |
1438 | while (inner) | |
1439 | { | |
1440 | gfc_gobble_whitespace (); | |
1441 | c1 = gfc_next_char (); | |
1442 | if (!ISALPHA (c1)) | |
1443 | goto bad; | |
1444 | ||
1445 | gfc_gobble_whitespace (); | |
1446 | c = gfc_next_char (); | |
1447 | ||
1448 | switch (c) | |
1449 | { | |
1450 | case ')': | |
1451 | inner = 0; /* Fall through */ | |
1452 | ||
1453 | case ',': | |
1454 | c2 = c1; | |
1455 | break; | |
1456 | ||
1457 | case '-': | |
1458 | gfc_gobble_whitespace (); | |
1459 | c2 = gfc_next_char (); | |
1460 | if (!ISALPHA (c2)) | |
1461 | goto bad; | |
1462 | ||
1463 | gfc_gobble_whitespace (); | |
1464 | c = gfc_next_char (); | |
1465 | ||
1466 | if ((c != ',') && (c != ')')) | |
1467 | goto bad; | |
1468 | if (c == ')') | |
1469 | inner = 0; | |
1470 | ||
1471 | break; | |
1472 | ||
1473 | default: | |
1474 | goto bad; | |
1475 | } | |
1476 | ||
1477 | if (c1 > c2) | |
1478 | { | |
1479 | gfc_error ("Letters must be in alphabetic order in " | |
1480 | "IMPLICIT statement at %C"); | |
1481 | goto bad; | |
1482 | } | |
1483 | ||
1484 | /* See if we can add the newly matched range to the pending | |
1485 | implicits from this IMPLICIT statement. We do not check for | |
1486 | conflicts with whatever earlier IMPLICIT statements may have | |
1487 | set. This is done when we've successfully finished matching | |
1488 | the current one. */ | |
1107b970 | 1489 | if (gfc_add_new_implicit_range (c1, c2) != SUCCESS) |
e5ddaa24 TS |
1490 | goto bad; |
1491 | } | |
1492 | ||
1493 | return MATCH_YES; | |
1494 | ||
1495 | bad: | |
1496 | gfc_syntax_error (ST_IMPLICIT); | |
1497 | ||
1498 | gfc_current_locus = cur_loc; | |
1499 | return MATCH_ERROR; | |
1500 | } | |
1501 | ||
1502 | ||
1503 | /* Match an IMPLICIT statement, storing the types for | |
1504 | gfc_set_implicit() if the statement is accepted by the parser. | |
1505 | There is a strange looking, but legal syntactic construction | |
1506 | possible. It looks like: | |
1507 | ||
1508 | IMPLICIT INTEGER (a-b) (c-d) | |
1509 | ||
1510 | This is legal if "a-b" is a constant expression that happens to | |
1511 | equal one of the legal kinds for integers. The real problem | |
1512 | happens with an implicit specification that looks like: | |
1513 | ||
1514 | IMPLICIT INTEGER (a-b) | |
1515 | ||
1516 | In this case, a typespec matcher that is "greedy" (as most of the | |
1517 | matchers are) gobbles the character range as a kindspec, leaving | |
1518 | nothing left. We therefore have to go a bit more slowly in the | |
1519 | matching process by inhibiting the kindspec checking during | |
1520 | typespec matching and checking for a kind later. */ | |
1521 | ||
1522 | match | |
1523 | gfc_match_implicit (void) | |
1524 | { | |
1525 | gfc_typespec ts; | |
1526 | locus cur_loc; | |
1527 | int c; | |
1528 | match m; | |
1529 | ||
1530 | /* We don't allow empty implicit statements. */ | |
1531 | if (gfc_match_eos () == MATCH_YES) | |
1532 | { | |
1533 | gfc_error ("Empty IMPLICIT statement at %C"); | |
1534 | return MATCH_ERROR; | |
1535 | } | |
1536 | ||
e5ddaa24 TS |
1537 | do |
1538 | { | |
1107b970 PB |
1539 | /* First cleanup. */ |
1540 | gfc_clear_new_implicit (); | |
1541 | ||
e5ddaa24 TS |
1542 | /* A basic type is mandatory here. */ |
1543 | m = match_type_spec (&ts, 1); | |
1544 | if (m == MATCH_ERROR) | |
1545 | goto error; | |
1546 | if (m == MATCH_NO) | |
1547 | goto syntax; | |
1548 | ||
1549 | cur_loc = gfc_current_locus; | |
1107b970 | 1550 | m = match_implicit_range (); |
e5ddaa24 TS |
1551 | |
1552 | if (m == MATCH_YES) | |
1553 | { | |
1107b970 | 1554 | /* We may have <TYPE> (<RANGE>). */ |
e5ddaa24 TS |
1555 | gfc_gobble_whitespace (); |
1556 | c = gfc_next_char (); | |
1557 | if ((c == '\n') || (c == ',')) | |
1107b970 PB |
1558 | { |
1559 | /* Check for CHARACTER with no length parameter. */ | |
1560 | if (ts.type == BT_CHARACTER && !ts.cl) | |
1561 | { | |
9d64df18 | 1562 | ts.kind = gfc_default_character_kind; |
1107b970 PB |
1563 | ts.cl = gfc_get_charlen (); |
1564 | ts.cl->next = gfc_current_ns->cl_list; | |
1565 | gfc_current_ns->cl_list = ts.cl; | |
1566 | ts.cl->length = gfc_int_expr (1); | |
1567 | } | |
1568 | ||
1569 | /* Record the Successful match. */ | |
1570 | if (gfc_merge_new_implicit (&ts) != SUCCESS) | |
1571 | return MATCH_ERROR; | |
1572 | continue; | |
1573 | } | |
e5ddaa24 TS |
1574 | |
1575 | gfc_current_locus = cur_loc; | |
1576 | } | |
1577 | ||
1107b970 PB |
1578 | /* Discard the (incorrectly) matched range. */ |
1579 | gfc_clear_new_implicit (); | |
1580 | ||
1581 | /* Last chance -- check <TYPE> <SELECTOR> (<RANGE>). */ | |
1582 | if (ts.type == BT_CHARACTER) | |
1583 | m = match_char_spec (&ts); | |
1584 | else | |
e5ddaa24 | 1585 | { |
1107b970 | 1586 | m = gfc_match_kind_spec (&ts); |
e5ddaa24 | 1587 | if (m == MATCH_NO) |
1107b970 PB |
1588 | { |
1589 | m = gfc_match_old_kind_spec (&ts); | |
1590 | if (m == MATCH_ERROR) | |
1591 | goto error; | |
1592 | if (m == MATCH_NO) | |
1593 | goto syntax; | |
1594 | } | |
e5ddaa24 | 1595 | } |
1107b970 PB |
1596 | if (m == MATCH_ERROR) |
1597 | goto error; | |
e5ddaa24 | 1598 | |
1107b970 | 1599 | m = match_implicit_range (); |
e5ddaa24 TS |
1600 | if (m == MATCH_ERROR) |
1601 | goto error; | |
1602 | if (m == MATCH_NO) | |
1603 | goto syntax; | |
1604 | ||
1605 | gfc_gobble_whitespace (); | |
1606 | c = gfc_next_char (); | |
1607 | if ((c != '\n') && (c != ',')) | |
1608 | goto syntax; | |
1609 | ||
1107b970 PB |
1610 | if (gfc_merge_new_implicit (&ts) != SUCCESS) |
1611 | return MATCH_ERROR; | |
e5ddaa24 TS |
1612 | } |
1613 | while (c == ','); | |
1614 | ||
1107b970 | 1615 | return MATCH_YES; |
e5ddaa24 TS |
1616 | |
1617 | syntax: | |
1618 | gfc_syntax_error (ST_IMPLICIT); | |
1619 | ||
1620 | error: | |
1621 | return MATCH_ERROR; | |
1622 | } | |
1623 | ||
1624 | ||
6de9cd9a DN |
1625 | /* Matches an attribute specification including array specs. If |
1626 | successful, leaves the variables current_attr and current_as | |
1627 | holding the specification. Also sets the colon_seen variable for | |
1628 | later use by matchers associated with initializations. | |
1629 | ||
1630 | This subroutine is a little tricky in the sense that we don't know | |
1631 | if we really have an attr-spec until we hit the double colon. | |
1632 | Until that time, we can only return MATCH_NO. This forces us to | |
1633 | check for duplicate specification at this level. */ | |
1634 | ||
1635 | static match | |
1636 | match_attr_spec (void) | |
1637 | { | |
1638 | ||
1639 | /* Modifiers that can exist in a type statement. */ | |
1640 | typedef enum | |
1641 | { GFC_DECL_BEGIN = 0, | |
1642 | DECL_ALLOCATABLE = GFC_DECL_BEGIN, DECL_DIMENSION, DECL_EXTERNAL, | |
1643 | DECL_IN, DECL_OUT, DECL_INOUT, DECL_INTRINSIC, DECL_OPTIONAL, | |
1644 | DECL_PARAMETER, DECL_POINTER, DECL_PRIVATE, DECL_PUBLIC, DECL_SAVE, | |
1645 | DECL_TARGET, DECL_COLON, DECL_NONE, | |
1646 | GFC_DECL_END /* Sentinel */ | |
1647 | } | |
1648 | decl_types; | |
1649 | ||
1650 | /* GFC_DECL_END is the sentinel, index starts at 0. */ | |
1651 | #define NUM_DECL GFC_DECL_END | |
1652 | ||
1653 | static mstring decls[] = { | |
1654 | minit (", allocatable", DECL_ALLOCATABLE), | |
1655 | minit (", dimension", DECL_DIMENSION), | |
1656 | minit (", external", DECL_EXTERNAL), | |
1657 | minit (", intent ( in )", DECL_IN), | |
1658 | minit (", intent ( out )", DECL_OUT), | |
1659 | minit (", intent ( in out )", DECL_INOUT), | |
1660 | minit (", intrinsic", DECL_INTRINSIC), | |
1661 | minit (", optional", DECL_OPTIONAL), | |
1662 | minit (", parameter", DECL_PARAMETER), | |
1663 | minit (", pointer", DECL_POINTER), | |
1664 | minit (", private", DECL_PRIVATE), | |
1665 | minit (", public", DECL_PUBLIC), | |
1666 | minit (", save", DECL_SAVE), | |
1667 | minit (", target", DECL_TARGET), | |
1668 | minit ("::", DECL_COLON), | |
1669 | minit (NULL, DECL_NONE) | |
1670 | }; | |
1671 | ||
1672 | locus start, seen_at[NUM_DECL]; | |
1673 | int seen[NUM_DECL]; | |
1674 | decl_types d; | |
1675 | const char *attr; | |
1676 | match m; | |
1677 | try t; | |
1678 | ||
1679 | gfc_clear_attr (¤t_attr); | |
63645982 | 1680 | start = gfc_current_locus; |
6de9cd9a DN |
1681 | |
1682 | current_as = NULL; | |
1683 | colon_seen = 0; | |
1684 | ||
1685 | /* See if we get all of the keywords up to the final double colon. */ | |
1686 | for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++) | |
1687 | seen[d] = 0; | |
1688 | ||
1689 | for (;;) | |
1690 | { | |
1691 | d = (decl_types) gfc_match_strings (decls); | |
1692 | if (d == DECL_NONE || d == DECL_COLON) | |
1693 | break; | |
1694 | ||
1695 | seen[d]++; | |
63645982 | 1696 | seen_at[d] = gfc_current_locus; |
6de9cd9a DN |
1697 | |
1698 | if (d == DECL_DIMENSION) | |
1699 | { | |
1700 | m = gfc_match_array_spec (¤t_as); | |
1701 | ||
1702 | if (m == MATCH_NO) | |
1703 | { | |
1704 | gfc_error ("Missing dimension specification at %C"); | |
1705 | m = MATCH_ERROR; | |
1706 | } | |
1707 | ||
1708 | if (m == MATCH_ERROR) | |
1709 | goto cleanup; | |
1710 | } | |
1711 | } | |
1712 | ||
1713 | /* No double colon, so assume that we've been looking at something | |
1714 | else the whole time. */ | |
1715 | if (d == DECL_NONE) | |
1716 | { | |
1717 | m = MATCH_NO; | |
1718 | goto cleanup; | |
1719 | } | |
1720 | ||
1721 | /* Since we've seen a double colon, we have to be looking at an | |
1722 | attr-spec. This means that we can now issue errors. */ | |
1723 | for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++) | |
1724 | if (seen[d] > 1) | |
1725 | { | |
1726 | switch (d) | |
1727 | { | |
1728 | case DECL_ALLOCATABLE: | |
1729 | attr = "ALLOCATABLE"; | |
1730 | break; | |
1731 | case DECL_DIMENSION: | |
1732 | attr = "DIMENSION"; | |
1733 | break; | |
1734 | case DECL_EXTERNAL: | |
1735 | attr = "EXTERNAL"; | |
1736 | break; | |
1737 | case DECL_IN: | |
1738 | attr = "INTENT (IN)"; | |
1739 | break; | |
1740 | case DECL_OUT: | |
1741 | attr = "INTENT (OUT)"; | |
1742 | break; | |
1743 | case DECL_INOUT: | |
1744 | attr = "INTENT (IN OUT)"; | |
1745 | break; | |
1746 | case DECL_INTRINSIC: | |
1747 | attr = "INTRINSIC"; | |
1748 | break; | |
1749 | case DECL_OPTIONAL: | |
1750 | attr = "OPTIONAL"; | |
1751 | break; | |
1752 | case DECL_PARAMETER: | |
1753 | attr = "PARAMETER"; | |
1754 | break; | |
1755 | case DECL_POINTER: | |
1756 | attr = "POINTER"; | |
1757 | break; | |
1758 | case DECL_PRIVATE: | |
1759 | attr = "PRIVATE"; | |
1760 | break; | |
1761 | case DECL_PUBLIC: | |
1762 | attr = "PUBLIC"; | |
1763 | break; | |
1764 | case DECL_SAVE: | |
1765 | attr = "SAVE"; | |
1766 | break; | |
1767 | case DECL_TARGET: | |
1768 | attr = "TARGET"; | |
1769 | break; | |
1770 | default: | |
1771 | attr = NULL; /* This shouldn't happen */ | |
1772 | } | |
1773 | ||
1774 | gfc_error ("Duplicate %s attribute at %L", attr, &seen_at[d]); | |
1775 | m = MATCH_ERROR; | |
1776 | goto cleanup; | |
1777 | } | |
1778 | ||
1779 | /* Now that we've dealt with duplicate attributes, add the attributes | |
1780 | to the current attribute. */ | |
1781 | for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++) | |
1782 | { | |
1783 | if (seen[d] == 0) | |
1784 | continue; | |
1785 | ||
1786 | if (gfc_current_state () == COMP_DERIVED | |
1787 | && d != DECL_DIMENSION && d != DECL_POINTER | |
1788 | && d != DECL_COLON && d != DECL_NONE) | |
1789 | { | |
1790 | ||
1791 | gfc_error ("Attribute at %L is not allowed in a TYPE definition", | |
1792 | &seen_at[d]); | |
1793 | m = MATCH_ERROR; | |
1794 | goto cleanup; | |
1795 | } | |
1796 | ||
1797 | switch (d) | |
1798 | { | |
1799 | case DECL_ALLOCATABLE: | |
1800 | t = gfc_add_allocatable (¤t_attr, &seen_at[d]); | |
1801 | break; | |
1802 | ||
1803 | case DECL_DIMENSION: | |
1804 | t = gfc_add_dimension (¤t_attr, &seen_at[d]); | |
1805 | break; | |
1806 | ||
1807 | case DECL_EXTERNAL: | |
1808 | t = gfc_add_external (¤t_attr, &seen_at[d]); | |
1809 | break; | |
1810 | ||
1811 | case DECL_IN: | |
1812 | t = gfc_add_intent (¤t_attr, INTENT_IN, &seen_at[d]); | |
1813 | break; | |
1814 | ||
1815 | case DECL_OUT: | |
1816 | t = gfc_add_intent (¤t_attr, INTENT_OUT, &seen_at[d]); | |
1817 | break; | |
1818 | ||
1819 | case DECL_INOUT: | |
1820 | t = gfc_add_intent (¤t_attr, INTENT_INOUT, &seen_at[d]); | |
1821 | break; | |
1822 | ||
1823 | case DECL_INTRINSIC: | |
1824 | t = gfc_add_intrinsic (¤t_attr, &seen_at[d]); | |
1825 | break; | |
1826 | ||
1827 | case DECL_OPTIONAL: | |
1828 | t = gfc_add_optional (¤t_attr, &seen_at[d]); | |
1829 | break; | |
1830 | ||
1831 | case DECL_PARAMETER: | |
1832 | t = gfc_add_flavor (¤t_attr, FL_PARAMETER, &seen_at[d]); | |
1833 | break; | |
1834 | ||
1835 | case DECL_POINTER: | |
1836 | t = gfc_add_pointer (¤t_attr, &seen_at[d]); | |
1837 | break; | |
1838 | ||
1839 | case DECL_PRIVATE: | |
1840 | t = gfc_add_access (¤t_attr, ACCESS_PRIVATE, &seen_at[d]); | |
1841 | break; | |
1842 | ||
1843 | case DECL_PUBLIC: | |
1844 | t = gfc_add_access (¤t_attr, ACCESS_PUBLIC, &seen_at[d]); | |
1845 | break; | |
1846 | ||
1847 | case DECL_SAVE: | |
1848 | t = gfc_add_save (¤t_attr, &seen_at[d]); | |
1849 | break; | |
1850 | ||
1851 | case DECL_TARGET: | |
1852 | t = gfc_add_target (¤t_attr, &seen_at[d]); | |
1853 | break; | |
1854 | ||
1855 | default: | |
1856 | gfc_internal_error ("match_attr_spec(): Bad attribute"); | |
1857 | } | |
1858 | ||
1859 | if (t == FAILURE) | |
1860 | { | |
1861 | m = MATCH_ERROR; | |
1862 | goto cleanup; | |
1863 | } | |
1864 | } | |
1865 | ||
1866 | colon_seen = 1; | |
1867 | return MATCH_YES; | |
1868 | ||
1869 | cleanup: | |
63645982 | 1870 | gfc_current_locus = start; |
6de9cd9a DN |
1871 | gfc_free_array_spec (current_as); |
1872 | current_as = NULL; | |
1873 | return m; | |
1874 | } | |
1875 | ||
1876 | ||
1877 | /* Match a data declaration statement. */ | |
1878 | ||
1879 | match | |
1880 | gfc_match_data_decl (void) | |
1881 | { | |
1882 | gfc_symbol *sym; | |
1883 | match m; | |
1884 | ||
e5ddaa24 | 1885 | m = match_type_spec (¤t_ts, 0); |
6de9cd9a DN |
1886 | if (m != MATCH_YES) |
1887 | return m; | |
1888 | ||
1889 | if (current_ts.type == BT_DERIVED && gfc_current_state () != COMP_DERIVED) | |
1890 | { | |
1891 | sym = gfc_use_derived (current_ts.derived); | |
1892 | ||
1893 | if (sym == NULL) | |
1894 | { | |
1895 | m = MATCH_ERROR; | |
1896 | goto cleanup; | |
1897 | } | |
1898 | ||
1899 | current_ts.derived = sym; | |
1900 | } | |
1901 | ||
1902 | m = match_attr_spec (); | |
1903 | if (m == MATCH_ERROR) | |
1904 | { | |
1905 | m = MATCH_NO; | |
1906 | goto cleanup; | |
1907 | } | |
1908 | ||
1909 | if (current_ts.type == BT_DERIVED && current_ts.derived->components == NULL) | |
1910 | { | |
1911 | ||
1912 | if (current_attr.pointer && gfc_current_state () == COMP_DERIVED) | |
1913 | goto ok; | |
1914 | ||
1915 | if (gfc_find_symbol (current_ts.derived->name, | |
1916 | current_ts.derived->ns->parent, 1, &sym) == 0) | |
1917 | goto ok; | |
1918 | ||
1919 | /* Hope that an ambiguous symbol is itself masked by a type definition. */ | |
1920 | if (sym != NULL && sym->attr.flavor == FL_DERIVED) | |
1921 | goto ok; | |
1922 | ||
1923 | gfc_error ("Derived type at %C has not been previously defined"); | |
1924 | m = MATCH_ERROR; | |
1925 | goto cleanup; | |
1926 | } | |
1927 | ||
1928 | ok: | |
1929 | /* If we have an old-style character declaration, and no new-style | |
1930 | attribute specifications, then there a comma is optional between | |
1931 | the type specification and the variable list. */ | |
1932 | if (m == MATCH_NO && current_ts.type == BT_CHARACTER && old_char_selector) | |
1933 | gfc_match_char (','); | |
1934 | ||
1935 | /* Give the types/attributes to symbols that follow. */ | |
1936 | for (;;) | |
1937 | { | |
1938 | m = variable_decl (); | |
1939 | if (m == MATCH_ERROR) | |
1940 | goto cleanup; | |
1941 | if (m == MATCH_NO) | |
1942 | break; | |
1943 | ||
1944 | if (gfc_match_eos () == MATCH_YES) | |
1945 | goto cleanup; | |
1946 | if (gfc_match_char (',') != MATCH_YES) | |
1947 | break; | |
1948 | } | |
1949 | ||
1950 | gfc_error ("Syntax error in data declaration at %C"); | |
1951 | m = MATCH_ERROR; | |
1952 | ||
1953 | cleanup: | |
1954 | gfc_free_array_spec (current_as); | |
1955 | current_as = NULL; | |
1956 | return m; | |
1957 | } | |
1958 | ||
1959 | ||
1960 | /* Match a prefix associated with a function or subroutine | |
1961 | declaration. If the typespec pointer is nonnull, then a typespec | |
1962 | can be matched. Note that if nothing matches, MATCH_YES is | |
1963 | returned (the null string was matched). */ | |
1964 | ||
1965 | static match | |
1966 | match_prefix (gfc_typespec * ts) | |
1967 | { | |
1968 | int seen_type; | |
1969 | ||
1970 | gfc_clear_attr (¤t_attr); | |
1971 | seen_type = 0; | |
1972 | ||
1973 | loop: | |
1974 | if (!seen_type && ts != NULL | |
e5ddaa24 | 1975 | && match_type_spec (ts, 0) == MATCH_YES |
6de9cd9a DN |
1976 | && gfc_match_space () == MATCH_YES) |
1977 | { | |
1978 | ||
1979 | seen_type = 1; | |
1980 | goto loop; | |
1981 | } | |
1982 | ||
1983 | if (gfc_match ("elemental% ") == MATCH_YES) | |
1984 | { | |
1985 | if (gfc_add_elemental (¤t_attr, NULL) == FAILURE) | |
1986 | return MATCH_ERROR; | |
1987 | ||
1988 | goto loop; | |
1989 | } | |
1990 | ||
1991 | if (gfc_match ("pure% ") == MATCH_YES) | |
1992 | { | |
1993 | if (gfc_add_pure (¤t_attr, NULL) == FAILURE) | |
1994 | return MATCH_ERROR; | |
1995 | ||
1996 | goto loop; | |
1997 | } | |
1998 | ||
1999 | if (gfc_match ("recursive% ") == MATCH_YES) | |
2000 | { | |
2001 | if (gfc_add_recursive (¤t_attr, NULL) == FAILURE) | |
2002 | return MATCH_ERROR; | |
2003 | ||
2004 | goto loop; | |
2005 | } | |
2006 | ||
2007 | /* At this point, the next item is not a prefix. */ | |
2008 | return MATCH_YES; | |
2009 | } | |
2010 | ||
2011 | ||
2012 | /* Copy attributes matched by match_prefix() to attributes on a symbol. */ | |
2013 | ||
2014 | static try | |
2015 | copy_prefix (symbol_attribute * dest, locus * where) | |
2016 | { | |
2017 | ||
2018 | if (current_attr.pure && gfc_add_pure (dest, where) == FAILURE) | |
2019 | return FAILURE; | |
2020 | ||
2021 | if (current_attr.elemental && gfc_add_elemental (dest, where) == FAILURE) | |
2022 | return FAILURE; | |
2023 | ||
2024 | if (current_attr.recursive && gfc_add_recursive (dest, where) == FAILURE) | |
2025 | return FAILURE; | |
2026 | ||
2027 | return SUCCESS; | |
2028 | } | |
2029 | ||
2030 | ||
2031 | /* Match a formal argument list. */ | |
2032 | ||
2033 | match | |
2034 | gfc_match_formal_arglist (gfc_symbol * progname, int st_flag, int null_flag) | |
2035 | { | |
2036 | gfc_formal_arglist *head, *tail, *p, *q; | |
2037 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
2038 | gfc_symbol *sym; | |
2039 | match m; | |
2040 | ||
2041 | head = tail = NULL; | |
2042 | ||
2043 | if (gfc_match_char ('(') != MATCH_YES) | |
2044 | { | |
2045 | if (null_flag) | |
2046 | goto ok; | |
2047 | return MATCH_NO; | |
2048 | } | |
2049 | ||
2050 | if (gfc_match_char (')') == MATCH_YES) | |
2051 | goto ok; | |
2052 | ||
2053 | for (;;) | |
2054 | { | |
2055 | if (gfc_match_char ('*') == MATCH_YES) | |
2056 | sym = NULL; | |
2057 | else | |
2058 | { | |
2059 | m = gfc_match_name (name); | |
2060 | if (m != MATCH_YES) | |
2061 | goto cleanup; | |
2062 | ||
2063 | if (gfc_get_symbol (name, NULL, &sym)) | |
2064 | goto cleanup; | |
2065 | } | |
2066 | ||
2067 | p = gfc_get_formal_arglist (); | |
2068 | ||
2069 | if (head == NULL) | |
2070 | head = tail = p; | |
2071 | else | |
2072 | { | |
2073 | tail->next = p; | |
2074 | tail = p; | |
2075 | } | |
2076 | ||
2077 | tail->sym = sym; | |
2078 | ||
2079 | /* We don't add the VARIABLE flavor because the name could be a | |
2080 | dummy procedure. We don't apply these attributes to formal | |
2081 | arguments of statement functions. */ | |
2082 | if (sym != NULL && !st_flag | |
2083 | && (gfc_add_dummy (&sym->attr, NULL) == FAILURE | |
2084 | || gfc_missing_attr (&sym->attr, NULL) == FAILURE)) | |
2085 | { | |
2086 | m = MATCH_ERROR; | |
2087 | goto cleanup; | |
2088 | } | |
2089 | ||
2090 | /* The name of a program unit can be in a different namespace, | |
2091 | so check for it explicitly. After the statement is accepted, | |
2092 | the name is checked for especially in gfc_get_symbol(). */ | |
2093 | if (gfc_new_block != NULL && sym != NULL | |
2094 | && strcmp (sym->name, gfc_new_block->name) == 0) | |
2095 | { | |
2096 | gfc_error ("Name '%s' at %C is the name of the procedure", | |
2097 | sym->name); | |
2098 | m = MATCH_ERROR; | |
2099 | goto cleanup; | |
2100 | } | |
2101 | ||
2102 | if (gfc_match_char (')') == MATCH_YES) | |
2103 | goto ok; | |
2104 | ||
2105 | m = gfc_match_char (','); | |
2106 | if (m != MATCH_YES) | |
2107 | { | |
2108 | gfc_error ("Unexpected junk in formal argument list at %C"); | |
2109 | goto cleanup; | |
2110 | } | |
2111 | } | |
2112 | ||
2113 | ok: | |
2114 | /* Check for duplicate symbols in the formal argument list. */ | |
2115 | if (head != NULL) | |
2116 | { | |
2117 | for (p = head; p->next; p = p->next) | |
2118 | { | |
2119 | if (p->sym == NULL) | |
2120 | continue; | |
2121 | ||
2122 | for (q = p->next; q; q = q->next) | |
2123 | if (p->sym == q->sym) | |
2124 | { | |
2125 | gfc_error | |
2126 | ("Duplicate symbol '%s' in formal argument list at %C", | |
2127 | p->sym->name); | |
2128 | ||
2129 | m = MATCH_ERROR; | |
2130 | goto cleanup; | |
2131 | } | |
2132 | } | |
2133 | } | |
2134 | ||
2135 | if (gfc_add_explicit_interface (progname, IFSRC_DECL, head, NULL) == | |
2136 | FAILURE) | |
2137 | { | |
2138 | m = MATCH_ERROR; | |
2139 | goto cleanup; | |
2140 | } | |
2141 | ||
2142 | return MATCH_YES; | |
2143 | ||
2144 | cleanup: | |
2145 | gfc_free_formal_arglist (head); | |
2146 | return m; | |
2147 | } | |
2148 | ||
2149 | ||
2150 | /* Match a RESULT specification following a function declaration or | |
2151 | ENTRY statement. Also matches the end-of-statement. */ | |
2152 | ||
2153 | static match | |
2154 | match_result (gfc_symbol * function, gfc_symbol ** result) | |
2155 | { | |
2156 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
2157 | gfc_symbol *r; | |
2158 | match m; | |
2159 | ||
2160 | if (gfc_match (" result (") != MATCH_YES) | |
2161 | return MATCH_NO; | |
2162 | ||
2163 | m = gfc_match_name (name); | |
2164 | if (m != MATCH_YES) | |
2165 | return m; | |
2166 | ||
2167 | if (gfc_match (" )%t") != MATCH_YES) | |
2168 | { | |
2169 | gfc_error ("Unexpected junk following RESULT variable at %C"); | |
2170 | return MATCH_ERROR; | |
2171 | } | |
2172 | ||
2173 | if (strcmp (function->name, name) == 0) | |
2174 | { | |
2175 | gfc_error | |
2176 | ("RESULT variable at %C must be different than function name"); | |
2177 | return MATCH_ERROR; | |
2178 | } | |
2179 | ||
2180 | if (gfc_get_symbol (name, NULL, &r)) | |
2181 | return MATCH_ERROR; | |
2182 | ||
2183 | if (gfc_add_flavor (&r->attr, FL_VARIABLE, NULL) == FAILURE | |
2184 | || gfc_add_result (&r->attr, NULL) == FAILURE) | |
2185 | return MATCH_ERROR; | |
2186 | ||
2187 | *result = r; | |
2188 | ||
2189 | return MATCH_YES; | |
2190 | } | |
2191 | ||
2192 | ||
2193 | /* Match a function declaration. */ | |
2194 | ||
2195 | match | |
2196 | gfc_match_function_decl (void) | |
2197 | { | |
2198 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
2199 | gfc_symbol *sym, *result; | |
2200 | locus old_loc; | |
2201 | match m; | |
2202 | ||
2203 | if (gfc_current_state () != COMP_NONE | |
2204 | && gfc_current_state () != COMP_INTERFACE | |
2205 | && gfc_current_state () != COMP_CONTAINS) | |
2206 | return MATCH_NO; | |
2207 | ||
2208 | gfc_clear_ts (¤t_ts); | |
2209 | ||
63645982 | 2210 | old_loc = gfc_current_locus; |
6de9cd9a DN |
2211 | |
2212 | m = match_prefix (¤t_ts); | |
2213 | if (m != MATCH_YES) | |
2214 | { | |
63645982 | 2215 | gfc_current_locus = old_loc; |
6de9cd9a DN |
2216 | return m; |
2217 | } | |
2218 | ||
2219 | if (gfc_match ("function% %n", name) != MATCH_YES) | |
2220 | { | |
63645982 | 2221 | gfc_current_locus = old_loc; |
6de9cd9a DN |
2222 | return MATCH_NO; |
2223 | } | |
2224 | ||
2225 | if (get_proc_name (name, &sym)) | |
2226 | return MATCH_ERROR; | |
2227 | gfc_new_block = sym; | |
2228 | ||
2229 | m = gfc_match_formal_arglist (sym, 0, 0); | |
2230 | if (m == MATCH_NO) | |
2231 | gfc_error ("Expected formal argument list in function definition at %C"); | |
2232 | else if (m == MATCH_ERROR) | |
2233 | goto cleanup; | |
2234 | ||
2235 | result = NULL; | |
2236 | ||
2237 | if (gfc_match_eos () != MATCH_YES) | |
2238 | { | |
2239 | /* See if a result variable is present. */ | |
2240 | m = match_result (sym, &result); | |
2241 | if (m == MATCH_NO) | |
2242 | gfc_error ("Unexpected junk after function declaration at %C"); | |
2243 | ||
2244 | if (m != MATCH_YES) | |
2245 | { | |
2246 | m = MATCH_ERROR; | |
2247 | goto cleanup; | |
2248 | } | |
2249 | } | |
2250 | ||
2251 | /* Make changes to the symbol. */ | |
2252 | m = MATCH_ERROR; | |
2253 | ||
2254 | if (gfc_add_function (&sym->attr, NULL) == FAILURE) | |
2255 | goto cleanup; | |
2256 | ||
2257 | if (gfc_missing_attr (&sym->attr, NULL) == FAILURE | |
2258 | || copy_prefix (&sym->attr, &sym->declared_at) == FAILURE) | |
2259 | goto cleanup; | |
2260 | ||
2261 | if (current_ts.type != BT_UNKNOWN && sym->ts.type != BT_UNKNOWN) | |
2262 | { | |
2263 | gfc_error ("Function '%s' at %C already has a type of %s", name, | |
2264 | gfc_basic_typename (sym->ts.type)); | |
2265 | goto cleanup; | |
2266 | } | |
2267 | ||
2268 | if (result == NULL) | |
2269 | { | |
2270 | sym->ts = current_ts; | |
2271 | sym->result = sym; | |
2272 | } | |
2273 | else | |
2274 | { | |
2275 | result->ts = current_ts; | |
2276 | sym->result = result; | |
2277 | } | |
2278 | ||
2279 | return MATCH_YES; | |
2280 | ||
2281 | cleanup: | |
63645982 | 2282 | gfc_current_locus = old_loc; |
6de9cd9a DN |
2283 | return m; |
2284 | } | |
2285 | ||
2286 | ||
2287 | /* Match an ENTRY statement. */ | |
2288 | ||
2289 | match | |
2290 | gfc_match_entry (void) | |
2291 | { | |
3d79abbd PB |
2292 | gfc_symbol *proc; |
2293 | gfc_symbol *result; | |
2294 | gfc_symbol *entry; | |
6de9cd9a DN |
2295 | char name[GFC_MAX_SYMBOL_LEN + 1]; |
2296 | gfc_compile_state state; | |
2297 | match m; | |
3d79abbd | 2298 | gfc_entry_list *el; |
6de9cd9a DN |
2299 | |
2300 | m = gfc_match_name (name); | |
2301 | if (m != MATCH_YES) | |
2302 | return m; | |
2303 | ||
3d79abbd PB |
2304 | state = gfc_current_state (); |
2305 | if (state != COMP_SUBROUTINE | |
2306 | && state != COMP_FUNCTION) | |
2307 | { | |
2308 | gfc_error ("ENTRY statement at %C cannot appear within %s", | |
2309 | gfc_state_name (gfc_current_state ())); | |
2310 | return MATCH_ERROR; | |
2311 | } | |
2312 | ||
2313 | if (gfc_current_ns->parent != NULL | |
2314 | && gfc_current_ns->parent->proc_name | |
2315 | && gfc_current_ns->parent->proc_name->attr.flavor != FL_MODULE) | |
2316 | { | |
2317 | gfc_error("ENTRY statement at %C cannot appear in a " | |
2318 | "contained procedure"); | |
2319 | return MATCH_ERROR; | |
2320 | } | |
2321 | ||
6de9cd9a DN |
2322 | if (get_proc_name (name, &entry)) |
2323 | return MATCH_ERROR; | |
2324 | ||
3d79abbd PB |
2325 | proc = gfc_current_block (); |
2326 | ||
2327 | if (state == COMP_SUBROUTINE) | |
6de9cd9a | 2328 | { |
3d79abbd | 2329 | /* And entry in a subroutine. */ |
6de9cd9a DN |
2330 | m = gfc_match_formal_arglist (entry, 0, 1); |
2331 | if (m != MATCH_YES) | |
2332 | return MATCH_ERROR; | |
2333 | ||
6de9cd9a DN |
2334 | if (gfc_add_entry (&entry->attr, NULL) == FAILURE |
2335 | || gfc_add_subroutine (&entry->attr, NULL) == FAILURE) | |
2336 | return MATCH_ERROR; | |
3d79abbd PB |
2337 | } |
2338 | else | |
2339 | { | |
2340 | /* An entry in a function. */ | |
6de9cd9a DN |
2341 | m = gfc_match_formal_arglist (entry, 0, 0); |
2342 | if (m != MATCH_YES) | |
2343 | return MATCH_ERROR; | |
2344 | ||
6de9cd9a DN |
2345 | result = NULL; |
2346 | ||
2347 | if (gfc_match_eos () == MATCH_YES) | |
2348 | { | |
2349 | if (gfc_add_entry (&entry->attr, NULL) == FAILURE | |
2350 | || gfc_add_function (&entry->attr, NULL) == FAILURE) | |
2351 | return MATCH_ERROR; | |
2352 | ||
3d79abbd | 2353 | entry->result = proc->result; |
6de9cd9a DN |
2354 | |
2355 | } | |
2356 | else | |
2357 | { | |
3d79abbd | 2358 | m = match_result (proc, &result); |
6de9cd9a DN |
2359 | if (m == MATCH_NO) |
2360 | gfc_syntax_error (ST_ENTRY); | |
2361 | if (m != MATCH_YES) | |
2362 | return MATCH_ERROR; | |
2363 | ||
2364 | if (gfc_add_result (&result->attr, NULL) == FAILURE | |
2365 | || gfc_add_entry (&entry->attr, NULL) == FAILURE | |
2366 | || gfc_add_function (&entry->attr, NULL) == FAILURE) | |
2367 | return MATCH_ERROR; | |
2368 | } | |
2369 | ||
3d79abbd | 2370 | if (proc->attr.recursive && result == NULL) |
6de9cd9a DN |
2371 | { |
2372 | gfc_error ("RESULT attribute required in ENTRY statement at %C"); | |
2373 | return MATCH_ERROR; | |
2374 | } | |
6de9cd9a DN |
2375 | } |
2376 | ||
2377 | if (gfc_match_eos () != MATCH_YES) | |
2378 | { | |
2379 | gfc_syntax_error (ST_ENTRY); | |
2380 | return MATCH_ERROR; | |
2381 | } | |
2382 | ||
3d79abbd PB |
2383 | entry->attr.recursive = proc->attr.recursive; |
2384 | entry->attr.elemental = proc->attr.elemental; | |
2385 | entry->attr.pure = proc->attr.pure; | |
6de9cd9a | 2386 | |
3d79abbd PB |
2387 | el = gfc_get_entry_list (); |
2388 | el->sym = entry; | |
2389 | el->next = gfc_current_ns->entries; | |
2390 | gfc_current_ns->entries = el; | |
2391 | if (el->next) | |
2392 | el->id = el->next->id + 1; | |
2393 | else | |
2394 | el->id = 1; | |
6de9cd9a | 2395 | |
3d79abbd PB |
2396 | new_st.op = EXEC_ENTRY; |
2397 | new_st.ext.entry = el; | |
2398 | ||
2399 | return MATCH_YES; | |
6de9cd9a DN |
2400 | } |
2401 | ||
2402 | ||
2403 | /* Match a subroutine statement, including optional prefixes. */ | |
2404 | ||
2405 | match | |
2406 | gfc_match_subroutine (void) | |
2407 | { | |
2408 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
2409 | gfc_symbol *sym; | |
2410 | match m; | |
2411 | ||
2412 | if (gfc_current_state () != COMP_NONE | |
2413 | && gfc_current_state () != COMP_INTERFACE | |
2414 | && gfc_current_state () != COMP_CONTAINS) | |
2415 | return MATCH_NO; | |
2416 | ||
2417 | m = match_prefix (NULL); | |
2418 | if (m != MATCH_YES) | |
2419 | return m; | |
2420 | ||
2421 | m = gfc_match ("subroutine% %n", name); | |
2422 | if (m != MATCH_YES) | |
2423 | return m; | |
2424 | ||
2425 | if (get_proc_name (name, &sym)) | |
2426 | return MATCH_ERROR; | |
2427 | gfc_new_block = sym; | |
2428 | ||
2429 | if (gfc_add_subroutine (&sym->attr, NULL) == FAILURE) | |
2430 | return MATCH_ERROR; | |
2431 | ||
2432 | if (gfc_match_formal_arglist (sym, 0, 1) != MATCH_YES) | |
2433 | return MATCH_ERROR; | |
2434 | ||
2435 | if (gfc_match_eos () != MATCH_YES) | |
2436 | { | |
2437 | gfc_syntax_error (ST_SUBROUTINE); | |
2438 | return MATCH_ERROR; | |
2439 | } | |
2440 | ||
2441 | if (copy_prefix (&sym->attr, &sym->declared_at) == FAILURE) | |
2442 | return MATCH_ERROR; | |
2443 | ||
2444 | return MATCH_YES; | |
2445 | } | |
2446 | ||
2447 | ||
1f2959f0 | 2448 | /* Return nonzero if we're currently compiling a contained procedure. */ |
ddc9ce91 TS |
2449 | |
2450 | static int | |
2451 | contained_procedure (void) | |
2452 | { | |
2453 | gfc_state_data *s; | |
2454 | ||
2455 | for (s=gfc_state_stack; s; s=s->previous) | |
2456 | if ((s->state == COMP_SUBROUTINE || s->state == COMP_FUNCTION) | |
2457 | && s->previous != NULL | |
2458 | && s->previous->state == COMP_CONTAINS) | |
2459 | return 1; | |
2460 | ||
2461 | return 0; | |
2462 | } | |
2463 | ||
6de9cd9a DN |
2464 | /* Match any of the various end-block statements. Returns the type of |
2465 | END to the caller. The END INTERFACE, END IF, END DO and END | |
2466 | SELECT statements cannot be replaced by a single END statement. */ | |
2467 | ||
2468 | match | |
2469 | gfc_match_end (gfc_statement * st) | |
2470 | { | |
2471 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
2472 | gfc_compile_state state; | |
2473 | locus old_loc; | |
2474 | const char *block_name; | |
2475 | const char *target; | |
ddc9ce91 | 2476 | int eos_ok; |
6de9cd9a DN |
2477 | match m; |
2478 | ||
63645982 | 2479 | old_loc = gfc_current_locus; |
6de9cd9a DN |
2480 | if (gfc_match ("end") != MATCH_YES) |
2481 | return MATCH_NO; | |
2482 | ||
2483 | state = gfc_current_state (); | |
2484 | block_name = | |
2485 | gfc_current_block () == NULL ? NULL : gfc_current_block ()->name; | |
2486 | ||
2487 | if (state == COMP_CONTAINS) | |
2488 | { | |
2489 | state = gfc_state_stack->previous->state; | |
2490 | block_name = gfc_state_stack->previous->sym == NULL ? NULL | |
2491 | : gfc_state_stack->previous->sym->name; | |
2492 | } | |
2493 | ||
2494 | switch (state) | |
2495 | { | |
2496 | case COMP_NONE: | |
2497 | case COMP_PROGRAM: | |
2498 | *st = ST_END_PROGRAM; | |
2499 | target = " program"; | |
ddc9ce91 | 2500 | eos_ok = 1; |
6de9cd9a DN |
2501 | break; |
2502 | ||
2503 | case COMP_SUBROUTINE: | |
2504 | *st = ST_END_SUBROUTINE; | |
2505 | target = " subroutine"; | |
ddc9ce91 | 2506 | eos_ok = !contained_procedure (); |
6de9cd9a DN |
2507 | break; |
2508 | ||
2509 | case COMP_FUNCTION: | |
2510 | *st = ST_END_FUNCTION; | |
2511 | target = " function"; | |
ddc9ce91 | 2512 | eos_ok = !contained_procedure (); |
6de9cd9a DN |
2513 | break; |
2514 | ||
2515 | case COMP_BLOCK_DATA: | |
2516 | *st = ST_END_BLOCK_DATA; | |
2517 | target = " block data"; | |
ddc9ce91 | 2518 | eos_ok = 1; |
6de9cd9a DN |
2519 | break; |
2520 | ||
2521 | case COMP_MODULE: | |
2522 | *st = ST_END_MODULE; | |
2523 | target = " module"; | |
ddc9ce91 | 2524 | eos_ok = 1; |
6de9cd9a DN |
2525 | break; |
2526 | ||
2527 | case COMP_INTERFACE: | |
2528 | *st = ST_END_INTERFACE; | |
2529 | target = " interface"; | |
ddc9ce91 | 2530 | eos_ok = 0; |
6de9cd9a DN |
2531 | break; |
2532 | ||
2533 | case COMP_DERIVED: | |
2534 | *st = ST_END_TYPE; | |
2535 | target = " type"; | |
ddc9ce91 | 2536 | eos_ok = 0; |
6de9cd9a DN |
2537 | break; |
2538 | ||
2539 | case COMP_IF: | |
2540 | *st = ST_ENDIF; | |
2541 | target = " if"; | |
ddc9ce91 | 2542 | eos_ok = 0; |
6de9cd9a DN |
2543 | break; |
2544 | ||
2545 | case COMP_DO: | |
2546 | *st = ST_ENDDO; | |
2547 | target = " do"; | |
ddc9ce91 | 2548 | eos_ok = 0; |
6de9cd9a DN |
2549 | break; |
2550 | ||
2551 | case COMP_SELECT: | |
2552 | *st = ST_END_SELECT; | |
2553 | target = " select"; | |
ddc9ce91 | 2554 | eos_ok = 0; |
6de9cd9a DN |
2555 | break; |
2556 | ||
2557 | case COMP_FORALL: | |
2558 | *st = ST_END_FORALL; | |
2559 | target = " forall"; | |
ddc9ce91 | 2560 | eos_ok = 0; |
6de9cd9a DN |
2561 | break; |
2562 | ||
2563 | case COMP_WHERE: | |
2564 | *st = ST_END_WHERE; | |
2565 | target = " where"; | |
ddc9ce91 | 2566 | eos_ok = 0; |
6de9cd9a DN |
2567 | break; |
2568 | ||
2569 | default: | |
2570 | gfc_error ("Unexpected END statement at %C"); | |
2571 | goto cleanup; | |
2572 | } | |
2573 | ||
2574 | if (gfc_match_eos () == MATCH_YES) | |
2575 | { | |
ddc9ce91 | 2576 | if (!eos_ok) |
6de9cd9a | 2577 | { |
ddc9ce91 | 2578 | /* We would have required END [something] */ |
59ce85b5 TS |
2579 | gfc_error ("%s statement expected at %L", |
2580 | gfc_ascii_statement (*st), &old_loc); | |
6de9cd9a DN |
2581 | goto cleanup; |
2582 | } | |
2583 | ||
2584 | return MATCH_YES; | |
2585 | } | |
2586 | ||
2587 | /* Verify that we've got the sort of end-block that we're expecting. */ | |
2588 | if (gfc_match (target) != MATCH_YES) | |
2589 | { | |
2590 | gfc_error ("Expecting %s statement at %C", gfc_ascii_statement (*st)); | |
2591 | goto cleanup; | |
2592 | } | |
2593 | ||
2594 | /* If we're at the end, make sure a block name wasn't required. */ | |
2595 | if (gfc_match_eos () == MATCH_YES) | |
2596 | { | |
2597 | ||
2598 | if (*st != ST_ENDDO && *st != ST_ENDIF && *st != ST_END_SELECT) | |
2599 | return MATCH_YES; | |
2600 | ||
2601 | if (gfc_current_block () == NULL) | |
2602 | return MATCH_YES; | |
2603 | ||
2604 | gfc_error ("Expected block name of '%s' in %s statement at %C", | |
2605 | block_name, gfc_ascii_statement (*st)); | |
2606 | ||
2607 | return MATCH_ERROR; | |
2608 | } | |
2609 | ||
2610 | /* END INTERFACE has a special handler for its several possible endings. */ | |
2611 | if (*st == ST_END_INTERFACE) | |
2612 | return gfc_match_end_interface (); | |
2613 | ||
2614 | /* We haven't hit the end of statement, so what is left must be an end-name. */ | |
2615 | m = gfc_match_space (); | |
2616 | if (m == MATCH_YES) | |
2617 | m = gfc_match_name (name); | |
2618 | ||
2619 | if (m == MATCH_NO) | |
2620 | gfc_error ("Expected terminating name at %C"); | |
2621 | if (m != MATCH_YES) | |
2622 | goto cleanup; | |
2623 | ||
2624 | if (block_name == NULL) | |
2625 | goto syntax; | |
2626 | ||
2627 | if (strcmp (name, block_name) != 0) | |
2628 | { | |
2629 | gfc_error ("Expected label '%s' for %s statement at %C", block_name, | |
2630 | gfc_ascii_statement (*st)); | |
2631 | goto cleanup; | |
2632 | } | |
2633 | ||
2634 | if (gfc_match_eos () == MATCH_YES) | |
2635 | return MATCH_YES; | |
2636 | ||
2637 | syntax: | |
2638 | gfc_syntax_error (*st); | |
2639 | ||
2640 | cleanup: | |
63645982 | 2641 | gfc_current_locus = old_loc; |
6de9cd9a DN |
2642 | return MATCH_ERROR; |
2643 | } | |
2644 | ||
2645 | ||
2646 | ||
2647 | /***************** Attribute declaration statements ****************/ | |
2648 | ||
2649 | /* Set the attribute of a single variable. */ | |
2650 | ||
2651 | static match | |
2652 | attr_decl1 (void) | |
2653 | { | |
2654 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
2655 | gfc_array_spec *as; | |
2656 | gfc_symbol *sym; | |
2657 | locus var_locus; | |
2658 | match m; | |
2659 | ||
2660 | as = NULL; | |
2661 | ||
2662 | m = gfc_match_name (name); | |
2663 | if (m != MATCH_YES) | |
2664 | goto cleanup; | |
2665 | ||
2666 | if (find_special (name, &sym)) | |
2667 | return MATCH_ERROR; | |
2668 | ||
63645982 | 2669 | var_locus = gfc_current_locus; |
6de9cd9a DN |
2670 | |
2671 | /* Deal with possible array specification for certain attributes. */ | |
2672 | if (current_attr.dimension | |
2673 | || current_attr.allocatable | |
2674 | || current_attr.pointer | |
2675 | || current_attr.target) | |
2676 | { | |
2677 | m = gfc_match_array_spec (&as); | |
2678 | if (m == MATCH_ERROR) | |
2679 | goto cleanup; | |
2680 | ||
2681 | if (current_attr.dimension && m == MATCH_NO) | |
2682 | { | |
2683 | gfc_error | |
2684 | ("Missing array specification at %L in DIMENSION statement", | |
2685 | &var_locus); | |
2686 | m = MATCH_ERROR; | |
2687 | goto cleanup; | |
2688 | } | |
2689 | ||
2690 | if ((current_attr.allocatable || current_attr.pointer) | |
2691 | && (m == MATCH_YES) && (as->type != AS_DEFERRED)) | |
2692 | { | |
2693 | gfc_error ("Array specification must be deferred at %L", | |
2694 | &var_locus); | |
2695 | m = MATCH_ERROR; | |
2696 | goto cleanup; | |
2697 | } | |
2698 | } | |
2699 | ||
2700 | /* Update symbol table. DIMENSION attribute is set in gfc_set_array_spec(). */ | |
2701 | if (current_attr.dimension == 0 | |
2702 | && gfc_copy_attr (&sym->attr, ¤t_attr, NULL) == FAILURE) | |
2703 | { | |
2704 | m = MATCH_ERROR; | |
2705 | goto cleanup; | |
2706 | } | |
2707 | ||
2708 | if (gfc_set_array_spec (sym, as, &var_locus) == FAILURE) | |
2709 | { | |
2710 | m = MATCH_ERROR; | |
2711 | goto cleanup; | |
2712 | } | |
2713 | ||
2714 | if ((current_attr.external || current_attr.intrinsic) | |
2715 | && sym->attr.flavor != FL_PROCEDURE | |
2716 | && gfc_add_flavor (&sym->attr, FL_PROCEDURE, NULL) == FAILURE) | |
2717 | { | |
2718 | m = MATCH_ERROR; | |
2719 | goto cleanup; | |
2720 | } | |
2721 | ||
2722 | return MATCH_YES; | |
2723 | ||
2724 | cleanup: | |
2725 | gfc_free_array_spec (as); | |
2726 | return m; | |
2727 | } | |
2728 | ||
2729 | ||
2730 | /* Generic attribute declaration subroutine. Used for attributes that | |
2731 | just have a list of names. */ | |
2732 | ||
2733 | static match | |
2734 | attr_decl (void) | |
2735 | { | |
2736 | match m; | |
2737 | ||
2738 | /* Gobble the optional double colon, by simply ignoring the result | |
2739 | of gfc_match(). */ | |
2740 | gfc_match (" ::"); | |
2741 | ||
2742 | for (;;) | |
2743 | { | |
2744 | m = attr_decl1 (); | |
2745 | if (m != MATCH_YES) | |
2746 | break; | |
2747 | ||
2748 | if (gfc_match_eos () == MATCH_YES) | |
2749 | { | |
2750 | m = MATCH_YES; | |
2751 | break; | |
2752 | } | |
2753 | ||
2754 | if (gfc_match_char (',') != MATCH_YES) | |
2755 | { | |
2756 | gfc_error ("Unexpected character in variable list at %C"); | |
2757 | m = MATCH_ERROR; | |
2758 | break; | |
2759 | } | |
2760 | } | |
2761 | ||
2762 | return m; | |
2763 | } | |
2764 | ||
2765 | ||
2766 | match | |
2767 | gfc_match_external (void) | |
2768 | { | |
2769 | ||
2770 | gfc_clear_attr (¤t_attr); | |
2771 | gfc_add_external (¤t_attr, NULL); | |
2772 | ||
2773 | return attr_decl (); | |
2774 | } | |
2775 | ||
2776 | ||
2777 | ||
2778 | match | |
2779 | gfc_match_intent (void) | |
2780 | { | |
2781 | sym_intent intent; | |
2782 | ||
2783 | intent = match_intent_spec (); | |
2784 | if (intent == INTENT_UNKNOWN) | |
2785 | return MATCH_ERROR; | |
2786 | ||
2787 | gfc_clear_attr (¤t_attr); | |
2788 | gfc_add_intent (¤t_attr, intent, NULL); /* Can't fail */ | |
2789 | ||
2790 | return attr_decl (); | |
2791 | } | |
2792 | ||
2793 | ||
2794 | match | |
2795 | gfc_match_intrinsic (void) | |
2796 | { | |
2797 | ||
2798 | gfc_clear_attr (¤t_attr); | |
2799 | gfc_add_intrinsic (¤t_attr, NULL); | |
2800 | ||
2801 | return attr_decl (); | |
2802 | } | |
2803 | ||
2804 | ||
2805 | match | |
2806 | gfc_match_optional (void) | |
2807 | { | |
2808 | ||
2809 | gfc_clear_attr (¤t_attr); | |
2810 | gfc_add_optional (¤t_attr, NULL); | |
2811 | ||
2812 | return attr_decl (); | |
2813 | } | |
2814 | ||
2815 | ||
2816 | match | |
2817 | gfc_match_pointer (void) | |
2818 | { | |
2819 | ||
2820 | gfc_clear_attr (¤t_attr); | |
2821 | gfc_add_pointer (¤t_attr, NULL); | |
2822 | ||
2823 | return attr_decl (); | |
2824 | } | |
2825 | ||
2826 | ||
2827 | match | |
2828 | gfc_match_allocatable (void) | |
2829 | { | |
2830 | ||
2831 | gfc_clear_attr (¤t_attr); | |
2832 | gfc_add_allocatable (¤t_attr, NULL); | |
2833 | ||
2834 | return attr_decl (); | |
2835 | } | |
2836 | ||
2837 | ||
2838 | match | |
2839 | gfc_match_dimension (void) | |
2840 | { | |
2841 | ||
2842 | gfc_clear_attr (¤t_attr); | |
2843 | gfc_add_dimension (¤t_attr, NULL); | |
2844 | ||
2845 | return attr_decl (); | |
2846 | } | |
2847 | ||
2848 | ||
2849 | match | |
2850 | gfc_match_target (void) | |
2851 | { | |
2852 | ||
2853 | gfc_clear_attr (¤t_attr); | |
2854 | gfc_add_target (¤t_attr, NULL); | |
2855 | ||
2856 | return attr_decl (); | |
2857 | } | |
2858 | ||
2859 | ||
2860 | /* Match the list of entities being specified in a PUBLIC or PRIVATE | |
2861 | statement. */ | |
2862 | ||
2863 | static match | |
2864 | access_attr_decl (gfc_statement st) | |
2865 | { | |
2866 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
2867 | interface_type type; | |
2868 | gfc_user_op *uop; | |
2869 | gfc_symbol *sym; | |
2870 | gfc_intrinsic_op operator; | |
2871 | match m; | |
2872 | ||
2873 | if (gfc_match (" ::") == MATCH_NO && gfc_match_space () == MATCH_NO) | |
2874 | goto done; | |
2875 | ||
2876 | for (;;) | |
2877 | { | |
2878 | m = gfc_match_generic_spec (&type, name, &operator); | |
2879 | if (m == MATCH_NO) | |
2880 | goto syntax; | |
2881 | if (m == MATCH_ERROR) | |
2882 | return MATCH_ERROR; | |
2883 | ||
2884 | switch (type) | |
2885 | { | |
2886 | case INTERFACE_NAMELESS: | |
2887 | goto syntax; | |
2888 | ||
2889 | case INTERFACE_GENERIC: | |
2890 | if (gfc_get_symbol (name, NULL, &sym)) | |
2891 | goto done; | |
2892 | ||
2893 | if (gfc_add_access (&sym->attr, | |
2894 | (st == | |
2895 | ST_PUBLIC) ? ACCESS_PUBLIC : ACCESS_PRIVATE, | |
2896 | NULL) == FAILURE) | |
2897 | return MATCH_ERROR; | |
2898 | ||
2899 | break; | |
2900 | ||
2901 | case INTERFACE_INTRINSIC_OP: | |
2902 | if (gfc_current_ns->operator_access[operator] == ACCESS_UNKNOWN) | |
2903 | { | |
2904 | gfc_current_ns->operator_access[operator] = | |
2905 | (st == ST_PUBLIC) ? ACCESS_PUBLIC : ACCESS_PRIVATE; | |
2906 | } | |
2907 | else | |
2908 | { | |
2909 | gfc_error ("Access specification of the %s operator at %C has " | |
2910 | "already been specified", gfc_op2string (operator)); | |
2911 | goto done; | |
2912 | } | |
2913 | ||
2914 | break; | |
2915 | ||
2916 | case INTERFACE_USER_OP: | |
2917 | uop = gfc_get_uop (name); | |
2918 | ||
2919 | if (uop->access == ACCESS_UNKNOWN) | |
2920 | { | |
2921 | uop->access = | |
2922 | (st == ST_PUBLIC) ? ACCESS_PUBLIC : ACCESS_PRIVATE; | |
2923 | } | |
2924 | else | |
2925 | { | |
2926 | gfc_error | |
2927 | ("Access specification of the .%s. operator at %C has " | |
2928 | "already been specified", sym->name); | |
2929 | goto done; | |
2930 | } | |
2931 | ||
2932 | break; | |
2933 | } | |
2934 | ||
2935 | if (gfc_match_char (',') == MATCH_NO) | |
2936 | break; | |
2937 | } | |
2938 | ||
2939 | if (gfc_match_eos () != MATCH_YES) | |
2940 | goto syntax; | |
2941 | return MATCH_YES; | |
2942 | ||
2943 | syntax: | |
2944 | gfc_syntax_error (st); | |
2945 | ||
2946 | done: | |
2947 | return MATCH_ERROR; | |
2948 | } | |
2949 | ||
2950 | ||
2951 | /* The PRIVATE statement is a bit weird in that it can be a attribute | |
2952 | declaration, but also works as a standlone statement inside of a | |
2953 | type declaration or a module. */ | |
2954 | ||
2955 | match | |
2956 | gfc_match_private (gfc_statement * st) | |
2957 | { | |
2958 | ||
2959 | if (gfc_match ("private") != MATCH_YES) | |
2960 | return MATCH_NO; | |
2961 | ||
2962 | if (gfc_current_state () == COMP_DERIVED) | |
2963 | { | |
2964 | if (gfc_match_eos () == MATCH_YES) | |
2965 | { | |
2966 | *st = ST_PRIVATE; | |
2967 | return MATCH_YES; | |
2968 | } | |
2969 | ||
2970 | gfc_syntax_error (ST_PRIVATE); | |
2971 | return MATCH_ERROR; | |
2972 | } | |
2973 | ||
2974 | if (gfc_match_eos () == MATCH_YES) | |
2975 | { | |
2976 | *st = ST_PRIVATE; | |
2977 | return MATCH_YES; | |
2978 | } | |
2979 | ||
2980 | *st = ST_ATTR_DECL; | |
2981 | return access_attr_decl (ST_PRIVATE); | |
2982 | } | |
2983 | ||
2984 | ||
2985 | match | |
2986 | gfc_match_public (gfc_statement * st) | |
2987 | { | |
2988 | ||
2989 | if (gfc_match ("public") != MATCH_YES) | |
2990 | return MATCH_NO; | |
2991 | ||
2992 | if (gfc_match_eos () == MATCH_YES) | |
2993 | { | |
2994 | *st = ST_PUBLIC; | |
2995 | return MATCH_YES; | |
2996 | } | |
2997 | ||
2998 | *st = ST_ATTR_DECL; | |
2999 | return access_attr_decl (ST_PUBLIC); | |
3000 | } | |
3001 | ||
3002 | ||
3003 | /* Workhorse for gfc_match_parameter. */ | |
3004 | ||
3005 | static match | |
3006 | do_parm (void) | |
3007 | { | |
3008 | gfc_symbol *sym; | |
3009 | gfc_expr *init; | |
3010 | match m; | |
3011 | ||
3012 | m = gfc_match_symbol (&sym, 0); | |
3013 | if (m == MATCH_NO) | |
3014 | gfc_error ("Expected variable name at %C in PARAMETER statement"); | |
3015 | ||
3016 | if (m != MATCH_YES) | |
3017 | return m; | |
3018 | ||
3019 | if (gfc_match_char ('=') == MATCH_NO) | |
3020 | { | |
3021 | gfc_error ("Expected = sign in PARAMETER statement at %C"); | |
3022 | return MATCH_ERROR; | |
3023 | } | |
3024 | ||
3025 | m = gfc_match_init_expr (&init); | |
3026 | if (m == MATCH_NO) | |
3027 | gfc_error ("Expected expression at %C in PARAMETER statement"); | |
3028 | if (m != MATCH_YES) | |
3029 | return m; | |
3030 | ||
3031 | if (sym->ts.type == BT_UNKNOWN | |
3032 | && gfc_set_default_type (sym, 1, NULL) == FAILURE) | |
3033 | { | |
3034 | m = MATCH_ERROR; | |
3035 | goto cleanup; | |
3036 | } | |
3037 | ||
3038 | if (gfc_check_assign_symbol (sym, init) == FAILURE | |
3039 | || gfc_add_flavor (&sym->attr, FL_PARAMETER, NULL) == FAILURE) | |
3040 | { | |
3041 | m = MATCH_ERROR; | |
3042 | goto cleanup; | |
3043 | } | |
3044 | ||
3045 | sym->value = init; | |
3046 | return MATCH_YES; | |
3047 | ||
3048 | cleanup: | |
3049 | gfc_free_expr (init); | |
3050 | return m; | |
3051 | } | |
3052 | ||
3053 | ||
3054 | /* Match a parameter statement, with the weird syntax that these have. */ | |
3055 | ||
3056 | match | |
3057 | gfc_match_parameter (void) | |
3058 | { | |
3059 | match m; | |
3060 | ||
3061 | if (gfc_match_char ('(') == MATCH_NO) | |
3062 | return MATCH_NO; | |
3063 | ||
3064 | for (;;) | |
3065 | { | |
3066 | m = do_parm (); | |
3067 | if (m != MATCH_YES) | |
3068 | break; | |
3069 | ||
3070 | if (gfc_match (" )%t") == MATCH_YES) | |
3071 | break; | |
3072 | ||
3073 | if (gfc_match_char (',') != MATCH_YES) | |
3074 | { | |
3075 | gfc_error ("Unexpected characters in PARAMETER statement at %C"); | |
3076 | m = MATCH_ERROR; | |
3077 | break; | |
3078 | } | |
3079 | } | |
3080 | ||
3081 | return m; | |
3082 | } | |
3083 | ||
3084 | ||
3085 | /* Save statements have a special syntax. */ | |
3086 | ||
3087 | match | |
3088 | gfc_match_save (void) | |
3089 | { | |
9056bd70 TS |
3090 | char n[GFC_MAX_SYMBOL_LEN+1]; |
3091 | gfc_common_head *c; | |
6de9cd9a DN |
3092 | gfc_symbol *sym; |
3093 | match m; | |
3094 | ||
3095 | if (gfc_match_eos () == MATCH_YES) | |
3096 | { | |
3097 | if (gfc_current_ns->seen_save) | |
3098 | { | |
3099 | gfc_error ("Blanket SAVE statement at %C follows previous " | |
3100 | "SAVE statement"); | |
3101 | ||
3102 | return MATCH_ERROR; | |
3103 | } | |
3104 | ||
3105 | gfc_current_ns->save_all = gfc_current_ns->seen_save = 1; | |
3106 | return MATCH_YES; | |
3107 | } | |
3108 | ||
3109 | if (gfc_current_ns->save_all) | |
3110 | { | |
3111 | gfc_error ("SAVE statement at %C follows blanket SAVE statement"); | |
3112 | return MATCH_ERROR; | |
3113 | } | |
3114 | ||
3115 | gfc_match (" ::"); | |
3116 | ||
3117 | for (;;) | |
3118 | { | |
3119 | m = gfc_match_symbol (&sym, 0); | |
3120 | switch (m) | |
3121 | { | |
3122 | case MATCH_YES: | |
63645982 | 3123 | if (gfc_add_save (&sym->attr, &gfc_current_locus) == FAILURE) |
6de9cd9a DN |
3124 | return MATCH_ERROR; |
3125 | goto next_item; | |
3126 | ||
3127 | case MATCH_NO: | |
3128 | break; | |
3129 | ||
3130 | case MATCH_ERROR: | |
3131 | return MATCH_ERROR; | |
3132 | } | |
3133 | ||
9056bd70 | 3134 | m = gfc_match (" / %n /", &n); |
6de9cd9a DN |
3135 | if (m == MATCH_ERROR) |
3136 | return MATCH_ERROR; | |
3137 | if (m == MATCH_NO) | |
3138 | goto syntax; | |
3139 | ||
53814b8f | 3140 | c = gfc_get_common (n, 0); |
9056bd70 TS |
3141 | c->saved = 1; |
3142 | ||
6de9cd9a DN |
3143 | gfc_current_ns->seen_save = 1; |
3144 | ||
3145 | next_item: | |
3146 | if (gfc_match_eos () == MATCH_YES) | |
3147 | break; | |
3148 | if (gfc_match_char (',') != MATCH_YES) | |
3149 | goto syntax; | |
3150 | } | |
3151 | ||
3152 | return MATCH_YES; | |
3153 | ||
3154 | syntax: | |
3155 | gfc_error ("Syntax error in SAVE statement at %C"); | |
3156 | return MATCH_ERROR; | |
3157 | } | |
3158 | ||
3159 | ||
3160 | /* Match a module procedure statement. Note that we have to modify | |
3161 | symbols in the parent's namespace because the current one was there | |
3162 | to receive symbols that are in a interface's formal argument list. */ | |
3163 | ||
3164 | match | |
3165 | gfc_match_modproc (void) | |
3166 | { | |
3167 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
3168 | gfc_symbol *sym; | |
3169 | match m; | |
3170 | ||
3171 | if (gfc_state_stack->state != COMP_INTERFACE | |
3172 | || gfc_state_stack->previous == NULL | |
3173 | || current_interface.type == INTERFACE_NAMELESS) | |
3174 | { | |
3175 | gfc_error | |
3176 | ("MODULE PROCEDURE at %C must be in a generic module interface"); | |
3177 | return MATCH_ERROR; | |
3178 | } | |
3179 | ||
3180 | for (;;) | |
3181 | { | |
3182 | m = gfc_match_name (name); | |
3183 | if (m == MATCH_NO) | |
3184 | goto syntax; | |
3185 | if (m != MATCH_YES) | |
3186 | return MATCH_ERROR; | |
3187 | ||
3188 | if (gfc_get_symbol (name, gfc_current_ns->parent, &sym)) | |
3189 | return MATCH_ERROR; | |
3190 | ||
3191 | if (sym->attr.proc != PROC_MODULE | |
3192 | && gfc_add_procedure (&sym->attr, PROC_MODULE, NULL) == FAILURE) | |
3193 | return MATCH_ERROR; | |
3194 | ||
3195 | if (gfc_add_interface (sym) == FAILURE) | |
3196 | return MATCH_ERROR; | |
3197 | ||
3198 | if (gfc_match_eos () == MATCH_YES) | |
3199 | break; | |
3200 | if (gfc_match_char (',') != MATCH_YES) | |
3201 | goto syntax; | |
3202 | } | |
3203 | ||
3204 | return MATCH_YES; | |
3205 | ||
3206 | syntax: | |
3207 | gfc_syntax_error (ST_MODULE_PROC); | |
3208 | return MATCH_ERROR; | |
3209 | } | |
3210 | ||
3211 | ||
3212 | /* Match the beginning of a derived type declaration. If a type name | |
3213 | was the result of a function, then it is possible to have a symbol | |
3214 | already to be known as a derived type yet have no components. */ | |
3215 | ||
3216 | match | |
3217 | gfc_match_derived_decl (void) | |
3218 | { | |
3219 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
3220 | symbol_attribute attr; | |
3221 | gfc_symbol *sym; | |
3222 | match m; | |
3223 | ||
3224 | if (gfc_current_state () == COMP_DERIVED) | |
3225 | return MATCH_NO; | |
3226 | ||
3227 | gfc_clear_attr (&attr); | |
3228 | ||
3229 | loop: | |
3230 | if (gfc_match (" , private") == MATCH_YES) | |
3231 | { | |
3232 | if (gfc_find_state (COMP_MODULE) == FAILURE) | |
3233 | { | |
3234 | gfc_error | |
3235 | ("Derived type at %C can only be PRIVATE within a MODULE"); | |
3236 | return MATCH_ERROR; | |
3237 | } | |
3238 | ||
3239 | if (gfc_add_access (&attr, ACCESS_PRIVATE, NULL) == FAILURE) | |
3240 | return MATCH_ERROR; | |
3241 | goto loop; | |
3242 | } | |
3243 | ||
3244 | if (gfc_match (" , public") == MATCH_YES) | |
3245 | { | |
3246 | if (gfc_find_state (COMP_MODULE) == FAILURE) | |
3247 | { | |
3248 | gfc_error ("Derived type at %C can only be PUBLIC within a MODULE"); | |
3249 | return MATCH_ERROR; | |
3250 | } | |
3251 | ||
3252 | if (gfc_add_access (&attr, ACCESS_PUBLIC, NULL) == FAILURE) | |
3253 | return MATCH_ERROR; | |
3254 | goto loop; | |
3255 | } | |
3256 | ||
3257 | if (gfc_match (" ::") != MATCH_YES && attr.access != ACCESS_UNKNOWN) | |
3258 | { | |
3259 | gfc_error ("Expected :: in TYPE definition at %C"); | |
3260 | return MATCH_ERROR; | |
3261 | } | |
3262 | ||
3263 | m = gfc_match (" %n%t", name); | |
3264 | if (m != MATCH_YES) | |
3265 | return m; | |
3266 | ||
3267 | /* Make sure the name isn't the name of an intrinsic type. The | |
3268 | 'double precision' type doesn't get past the name matcher. */ | |
3269 | if (strcmp (name, "integer") == 0 | |
3270 | || strcmp (name, "real") == 0 | |
3271 | || strcmp (name, "character") == 0 | |
3272 | || strcmp (name, "logical") == 0 | |
3273 | || strcmp (name, "complex") == 0) | |
3274 | { | |
3275 | gfc_error | |
3276 | ("Type name '%s' at %C cannot be the same as an intrinsic type", | |
3277 | name); | |
3278 | return MATCH_ERROR; | |
3279 | } | |
3280 | ||
3281 | if (gfc_get_symbol (name, NULL, &sym)) | |
3282 | return MATCH_ERROR; | |
3283 | ||
3284 | if (sym->ts.type != BT_UNKNOWN) | |
3285 | { | |
3286 | gfc_error ("Derived type name '%s' at %C already has a basic type " | |
3287 | "of %s", sym->name, gfc_typename (&sym->ts)); | |
3288 | return MATCH_ERROR; | |
3289 | } | |
3290 | ||
3291 | /* The symbol may already have the derived attribute without the | |
3292 | components. The ways this can happen is via a function | |
3293 | definition, an INTRINSIC statement or a subtype in another | |
3294 | derived type that is a pointer. The first part of the AND clause | |
f7b529fa | 3295 | is true if a the symbol is not the return value of a function. */ |
6de9cd9a DN |
3296 | if (sym->attr.flavor != FL_DERIVED |
3297 | && gfc_add_flavor (&sym->attr, FL_DERIVED, NULL) == FAILURE) | |
3298 | return MATCH_ERROR; | |
3299 | ||
3300 | if (sym->components != NULL) | |
3301 | { | |
3302 | gfc_error | |
3303 | ("Derived type definition of '%s' at %C has already been defined", | |
3304 | sym->name); | |
3305 | return MATCH_ERROR; | |
3306 | } | |
3307 | ||
3308 | if (attr.access != ACCESS_UNKNOWN | |
3309 | && gfc_add_access (&sym->attr, attr.access, NULL) == FAILURE) | |
3310 | return MATCH_ERROR; | |
3311 | ||
3312 | gfc_new_block = sym; | |
3313 | ||
3314 | return MATCH_YES; | |
3315 | } |