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6de9cd9a DN |
1 | /* Declaration statement matcher |
2 | Copyright (C) 2002 Free Software Foundation, Inc. | |
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 | ||
51 | /* Match an intent specification. Since this can only happen after an | |
52 | INTENT word, a legal intent-spec must follow. */ | |
53 | ||
54 | static sym_intent | |
55 | match_intent_spec (void) | |
56 | { | |
57 | ||
58 | if (gfc_match (" ( in out )") == MATCH_YES) | |
59 | return INTENT_INOUT; | |
60 | if (gfc_match (" ( in )") == MATCH_YES) | |
61 | return INTENT_IN; | |
62 | if (gfc_match (" ( out )") == MATCH_YES) | |
63 | return INTENT_OUT; | |
64 | ||
65 | gfc_error ("Bad INTENT specification at %C"); | |
66 | return INTENT_UNKNOWN; | |
67 | } | |
68 | ||
69 | ||
70 | /* Matches a character length specification, which is either a | |
71 | specification expression or a '*'. */ | |
72 | ||
73 | static match | |
74 | char_len_param_value (gfc_expr ** expr) | |
75 | { | |
76 | ||
77 | if (gfc_match_char ('*') == MATCH_YES) | |
78 | { | |
79 | *expr = NULL; | |
80 | return MATCH_YES; | |
81 | } | |
82 | ||
83 | return gfc_match_expr (expr); | |
84 | } | |
85 | ||
86 | ||
87 | /* A character length is a '*' followed by a literal integer or a | |
88 | char_len_param_value in parenthesis. */ | |
89 | ||
90 | static match | |
91 | match_char_length (gfc_expr ** expr) | |
92 | { | |
93 | int length; | |
94 | match m; | |
95 | ||
96 | m = gfc_match_char ('*'); | |
97 | if (m != MATCH_YES) | |
98 | return m; | |
99 | ||
100 | m = gfc_match_small_literal_int (&length); | |
101 | if (m == MATCH_ERROR) | |
102 | return m; | |
103 | ||
104 | if (m == MATCH_YES) | |
105 | { | |
106 | *expr = gfc_int_expr (length); | |
107 | return m; | |
108 | } | |
109 | ||
110 | if (gfc_match_char ('(') == MATCH_NO) | |
111 | goto syntax; | |
112 | ||
113 | m = char_len_param_value (expr); | |
114 | if (m == MATCH_ERROR) | |
115 | return m; | |
116 | if (m == MATCH_NO) | |
117 | goto syntax; | |
118 | ||
119 | if (gfc_match_char (')') == MATCH_NO) | |
120 | { | |
121 | gfc_free_expr (*expr); | |
122 | *expr = NULL; | |
123 | goto syntax; | |
124 | } | |
125 | ||
126 | return MATCH_YES; | |
127 | ||
128 | syntax: | |
129 | gfc_error ("Syntax error in character length specification at %C"); | |
130 | return MATCH_ERROR; | |
131 | } | |
132 | ||
133 | ||
134 | /* Special subroutine for finding a symbol. If we're compiling a | |
135 | function or subroutine and the parent compilation unit is an | |
136 | interface, then check to see if the name we've been given is the | |
137 | name of the interface (located in another namespace). If so, | |
138 | return that symbol. If not, use gfc_get_symbol(). */ | |
139 | ||
140 | static int | |
141 | find_special (const char *name, gfc_symbol ** result) | |
142 | { | |
143 | gfc_state_data *s; | |
144 | ||
145 | if (gfc_current_state () != COMP_SUBROUTINE | |
146 | && gfc_current_state () != COMP_FUNCTION) | |
147 | goto normal; | |
148 | ||
149 | s = gfc_state_stack->previous; | |
150 | if (s == NULL) | |
151 | goto normal; | |
152 | ||
153 | if (s->state != COMP_INTERFACE) | |
154 | goto normal; | |
155 | if (s->sym == NULL) | |
156 | goto normal; /* Nameless interface */ | |
157 | ||
158 | if (strcmp (name, s->sym->name) == 0) | |
159 | { | |
160 | *result = s->sym; | |
161 | return 0; | |
162 | } | |
163 | ||
164 | normal: | |
165 | return gfc_get_symbol (name, NULL, result); | |
166 | } | |
167 | ||
168 | ||
169 | /* Special subroutine for getting a symbol node associated with a | |
170 | procedure name, used in SUBROUTINE and FUNCTION statements. The | |
171 | symbol is created in the parent using with symtree node in the | |
172 | child unit pointing to the symbol. If the current namespace has no | |
173 | parent, then the symbol is just created in the current unit. */ | |
174 | ||
175 | static int | |
176 | get_proc_name (const char *name, gfc_symbol ** result) | |
177 | { | |
178 | gfc_symtree *st; | |
179 | gfc_symbol *sym; | |
180 | int rc; | |
181 | ||
182 | if (gfc_current_ns->parent == NULL) | |
183 | return gfc_get_symbol (name, NULL, result); | |
184 | ||
185 | rc = gfc_get_symbol (name, gfc_current_ns->parent, result); | |
186 | if (*result == NULL) | |
187 | return rc; | |
188 | ||
189 | /* Deal with ENTRY problem */ | |
190 | ||
191 | st = gfc_new_symtree (&gfc_current_ns->sym_root, name); | |
192 | ||
193 | sym = *result; | |
194 | st->n.sym = sym; | |
195 | sym->refs++; | |
196 | ||
197 | /* See if the procedure should be a module procedure */ | |
198 | ||
199 | if (sym->ns->proc_name != NULL | |
200 | && sym->ns->proc_name->attr.flavor == FL_MODULE | |
201 | && sym->attr.proc != PROC_MODULE | |
202 | && gfc_add_procedure (&sym->attr, PROC_MODULE, NULL) == FAILURE) | |
203 | rc = 2; | |
204 | ||
205 | return rc; | |
206 | } | |
207 | ||
208 | ||
209 | /* Function called by variable_decl() that adds a name to the symbol | |
210 | table. */ | |
211 | ||
212 | static try | |
213 | build_sym (const char *name, gfc_charlen * cl, | |
214 | gfc_array_spec ** as, locus * var_locus) | |
215 | { | |
216 | symbol_attribute attr; | |
217 | gfc_symbol *sym; | |
218 | ||
219 | if (find_special (name, &sym)) | |
220 | return FAILURE; | |
221 | ||
222 | /* Start updating the symbol table. Add basic type attribute | |
223 | if present. */ | |
224 | if (current_ts.type != BT_UNKNOWN | |
225 | &&(sym->attr.implicit_type == 0 | |
226 | || !gfc_compare_types (&sym->ts, ¤t_ts)) | |
227 | && gfc_add_type (sym, ¤t_ts, var_locus) == FAILURE) | |
228 | return FAILURE; | |
229 | ||
230 | if (sym->ts.type == BT_CHARACTER) | |
231 | sym->ts.cl = cl; | |
232 | ||
233 | /* Add dimension attribute if present. */ | |
234 | if (gfc_set_array_spec (sym, *as, var_locus) == FAILURE) | |
235 | return FAILURE; | |
236 | *as = NULL; | |
237 | ||
238 | /* Add attribute to symbol. The copy is so that we can reset the | |
239 | dimension attribute. */ | |
240 | attr = current_attr; | |
241 | attr.dimension = 0; | |
242 | ||
243 | if (gfc_copy_attr (&sym->attr, &attr, var_locus) == FAILURE) | |
244 | return FAILURE; | |
245 | ||
246 | return SUCCESS; | |
247 | } | |
248 | ||
249 | ||
250 | /* Function called by variable_decl() that adds an initialization | |
251 | expression to a symbol. */ | |
252 | ||
253 | static try | |
254 | add_init_expr_to_sym (const char *name, gfc_expr ** initp, | |
255 | locus * var_locus) | |
256 | { | |
257 | symbol_attribute attr; | |
258 | gfc_symbol *sym; | |
259 | gfc_expr *init; | |
260 | ||
261 | init = *initp; | |
262 | if (find_special (name, &sym)) | |
263 | return FAILURE; | |
264 | ||
265 | attr = sym->attr; | |
266 | ||
267 | /* If this symbol is confirming an implicit parameter type, | |
268 | then an initialization expression is not allowed. */ | |
269 | if (attr.flavor == FL_PARAMETER | |
270 | && sym->value != NULL | |
271 | && *initp != NULL) | |
272 | { | |
273 | gfc_error ("Initializer not allowed for PARAMETER '%s' at %C", | |
274 | sym->name); | |
275 | return FAILURE; | |
276 | } | |
277 | ||
c8e20bd0 TS |
278 | if (attr.in_common |
279 | && !attr.data | |
280 | && *initp != NULL) | |
281 | { | |
282 | gfc_error ("Initializer not allowed for COMMON variable '%s' at %C", | |
283 | sym->name); | |
284 | return FAILURE; | |
285 | } | |
286 | ||
6de9cd9a DN |
287 | if (init == NULL) |
288 | { | |
289 | /* An initializer is required for PARAMETER declarations. */ | |
290 | if (attr.flavor == FL_PARAMETER) | |
291 | { | |
292 | gfc_error ("PARAMETER at %L is missing an initializer", var_locus); | |
293 | return FAILURE; | |
294 | } | |
295 | } | |
296 | else | |
297 | { | |
298 | /* If a variable appears in a DATA block, it cannot have an | |
1de8a836 | 299 | initializer. */ |
6de9cd9a DN |
300 | if (sym->attr.data) |
301 | { | |
302 | gfc_error | |
303 | ("Variable '%s' at %C with an initializer already appears " | |
304 | "in a DATA statement", sym->name); | |
305 | return FAILURE; | |
306 | } | |
307 | ||
308 | /* Checking a derived type parameter has to be put off until later. */ | |
309 | if (sym->ts.type != BT_DERIVED && init->ts.type != BT_DERIVED | |
310 | && gfc_check_assign_symbol (sym, init) == FAILURE) | |
311 | return FAILURE; | |
312 | ||
313 | /* Add initializer. Make sure we keep the ranks sane. */ | |
314 | if (sym->attr.dimension && init->rank == 0) | |
315 | init->rank = sym->as->rank; | |
316 | ||
317 | sym->value = init; | |
318 | *initp = NULL; | |
319 | } | |
320 | ||
321 | return SUCCESS; | |
322 | } | |
323 | ||
324 | ||
325 | /* Function called by variable_decl() that adds a name to a structure | |
326 | being built. */ | |
327 | ||
328 | static try | |
329 | build_struct (const char *name, gfc_charlen * cl, gfc_expr ** init, | |
330 | gfc_array_spec ** as) | |
331 | { | |
332 | gfc_component *c; | |
333 | ||
334 | /* If the current symbol is of the same derived type that we're | |
335 | constructing, it must have the pointer attribute. */ | |
336 | if (current_ts.type == BT_DERIVED | |
337 | && current_ts.derived == gfc_current_block () | |
338 | && current_attr.pointer == 0) | |
339 | { | |
340 | gfc_error ("Component at %C must have the POINTER attribute"); | |
341 | return FAILURE; | |
342 | } | |
343 | ||
344 | if (gfc_current_block ()->attr.pointer | |
345 | && (*as)->rank != 0) | |
346 | { | |
347 | if ((*as)->type != AS_DEFERRED && (*as)->type != AS_EXPLICIT) | |
348 | { | |
349 | gfc_error ("Array component of structure at %C must have explicit " | |
350 | "or deferred shape"); | |
351 | return FAILURE; | |
352 | } | |
353 | } | |
354 | ||
355 | if (gfc_add_component (gfc_current_block (), name, &c) == FAILURE) | |
356 | return FAILURE; | |
357 | ||
358 | c->ts = current_ts; | |
359 | c->ts.cl = cl; | |
360 | gfc_set_component_attr (c, ¤t_attr); | |
361 | ||
362 | c->initializer = *init; | |
363 | *init = NULL; | |
364 | ||
365 | c->as = *as; | |
366 | if (c->as != NULL) | |
367 | c->dimension = 1; | |
368 | *as = NULL; | |
369 | ||
370 | /* Check array components. */ | |
371 | if (!c->dimension) | |
372 | return SUCCESS; | |
373 | ||
374 | if (c->pointer) | |
375 | { | |
376 | if (c->as->type != AS_DEFERRED) | |
377 | { | |
378 | gfc_error ("Pointer array component of structure at %C " | |
379 | "must have a deferred shape"); | |
380 | return FAILURE; | |
381 | } | |
382 | } | |
383 | else | |
384 | { | |
385 | if (c->as->type != AS_EXPLICIT) | |
386 | { | |
387 | gfc_error | |
388 | ("Array component of structure at %C must have an explicit " | |
389 | "shape"); | |
390 | return FAILURE; | |
391 | } | |
392 | } | |
393 | ||
394 | return SUCCESS; | |
395 | } | |
396 | ||
397 | ||
398 | /* Match a 'NULL()', and possibly take care of some side effects. */ | |
399 | ||
400 | match | |
401 | gfc_match_null (gfc_expr ** result) | |
402 | { | |
403 | gfc_symbol *sym; | |
404 | gfc_expr *e; | |
405 | match m; | |
406 | ||
407 | m = gfc_match (" null ( )"); | |
408 | if (m != MATCH_YES) | |
409 | return m; | |
410 | ||
411 | /* The NULL symbol now has to be/become an intrinsic function. */ | |
412 | if (gfc_get_symbol ("null", NULL, &sym)) | |
413 | { | |
414 | gfc_error ("NULL() initialization at %C is ambiguous"); | |
415 | return MATCH_ERROR; | |
416 | } | |
417 | ||
418 | gfc_intrinsic_symbol (sym); | |
419 | ||
420 | if (sym->attr.proc != PROC_INTRINSIC | |
421 | && (gfc_add_procedure (&sym->attr, PROC_INTRINSIC, NULL) == FAILURE | |
422 | || gfc_add_function (&sym->attr, NULL) == FAILURE)) | |
423 | return MATCH_ERROR; | |
424 | ||
425 | e = gfc_get_expr (); | |
63645982 | 426 | e->where = gfc_current_locus; |
6de9cd9a DN |
427 | e->expr_type = EXPR_NULL; |
428 | e->ts.type = BT_UNKNOWN; | |
429 | ||
430 | *result = e; | |
431 | ||
432 | return MATCH_YES; | |
433 | } | |
434 | ||
435 | ||
6de9cd9a DN |
436 | /* Match a variable name with an optional initializer. When this |
437 | subroutine is called, a variable is expected to be parsed next. | |
438 | Depending on what is happening at the moment, updates either the | |
439 | symbol table or the current interface. */ | |
440 | ||
441 | static match | |
442 | variable_decl (void) | |
443 | { | |
444 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
445 | gfc_expr *initializer, *char_len; | |
446 | gfc_array_spec *as; | |
447 | gfc_charlen *cl; | |
448 | locus var_locus; | |
449 | match m; | |
450 | try t; | |
451 | ||
452 | initializer = NULL; | |
453 | as = NULL; | |
454 | ||
455 | /* When we get here, we've just matched a list of attributes and | |
456 | maybe a type and a double colon. The next thing we expect to see | |
457 | is the name of the symbol. */ | |
458 | m = gfc_match_name (name); | |
459 | if (m != MATCH_YES) | |
460 | goto cleanup; | |
461 | ||
63645982 | 462 | var_locus = gfc_current_locus; |
6de9cd9a DN |
463 | |
464 | /* Now we could see the optional array spec. or character length. */ | |
465 | m = gfc_match_array_spec (&as); | |
466 | if (m == MATCH_ERROR) | |
467 | goto cleanup; | |
468 | if (m == MATCH_NO) | |
469 | as = gfc_copy_array_spec (current_as); | |
470 | ||
471 | char_len = NULL; | |
472 | cl = NULL; | |
473 | ||
474 | if (current_ts.type == BT_CHARACTER) | |
475 | { | |
476 | switch (match_char_length (&char_len)) | |
477 | { | |
478 | case MATCH_YES: | |
479 | cl = gfc_get_charlen (); | |
480 | cl->next = gfc_current_ns->cl_list; | |
481 | gfc_current_ns->cl_list = cl; | |
482 | ||
483 | cl->length = char_len; | |
484 | break; | |
485 | ||
486 | case MATCH_NO: | |
487 | cl = current_ts.cl; | |
488 | break; | |
489 | ||
490 | case MATCH_ERROR: | |
491 | goto cleanup; | |
492 | } | |
493 | } | |
494 | ||
495 | /* OK, we've successfully matched the declaration. Now put the | |
496 | symbol in the current namespace, because it might be used in the | |
497 | optional intialization expression for this symbol, e.g. this is | |
498 | perfectly legal: | |
499 | ||
500 | integer, parameter :: i = huge(i) | |
501 | ||
502 | This is only true for parameters or variables of a basic type. | |
503 | For components of derived types, it is not true, so we don't | |
504 | create a symbol for those yet. If we fail to create the symbol, | |
505 | bail out. */ | |
506 | if (gfc_current_state () != COMP_DERIVED | |
507 | && build_sym (name, cl, &as, &var_locus) == FAILURE) | |
508 | { | |
509 | m = MATCH_ERROR; | |
510 | goto cleanup; | |
511 | } | |
512 | ||
513 | /* In functions that have a RESULT variable defined, the function | |
514 | name always refers to function calls. Therefore, the name is | |
515 | not allowed to appear in specification statements. */ | |
516 | if (gfc_current_state () == COMP_FUNCTION | |
517 | && gfc_current_block () != NULL | |
518 | && gfc_current_block ()->result != NULL | |
519 | && gfc_current_block ()->result != gfc_current_block () | |
520 | && strcmp (gfc_current_block ()->name, name) == 0) | |
521 | { | |
522 | gfc_error ("Function name '%s' not allowed at %C", name); | |
523 | m = MATCH_ERROR; | |
524 | goto cleanup; | |
525 | } | |
526 | ||
527 | /* The double colon must be present in order to have initializers. | |
528 | Otherwise the statement is ambiguous with an assignment statement. */ | |
529 | if (colon_seen) | |
530 | { | |
531 | if (gfc_match (" =>") == MATCH_YES) | |
532 | { | |
533 | ||
534 | if (!current_attr.pointer) | |
535 | { | |
536 | gfc_error ("Initialization at %C isn't for a pointer variable"); | |
537 | m = MATCH_ERROR; | |
538 | goto cleanup; | |
539 | } | |
540 | ||
541 | m = gfc_match_null (&initializer); | |
542 | if (m == MATCH_NO) | |
543 | { | |
544 | gfc_error ("Pointer initialization requires a NULL at %C"); | |
545 | m = MATCH_ERROR; | |
546 | } | |
547 | ||
548 | if (gfc_pure (NULL)) | |
549 | { | |
550 | gfc_error | |
551 | ("Initialization of pointer at %C is not allowed in a " | |
552 | "PURE procedure"); | |
553 | m = MATCH_ERROR; | |
554 | } | |
555 | ||
556 | if (m != MATCH_YES) | |
557 | goto cleanup; | |
558 | ||
559 | initializer->ts = current_ts; | |
560 | ||
561 | } | |
562 | else if (gfc_match_char ('=') == MATCH_YES) | |
563 | { | |
564 | if (current_attr.pointer) | |
565 | { | |
566 | gfc_error | |
567 | ("Pointer initialization at %C requires '=>', not '='"); | |
568 | m = MATCH_ERROR; | |
569 | goto cleanup; | |
570 | } | |
571 | ||
572 | m = gfc_match_init_expr (&initializer); | |
573 | if (m == MATCH_NO) | |
574 | { | |
575 | gfc_error ("Expected an initialization expression at %C"); | |
576 | m = MATCH_ERROR; | |
577 | } | |
578 | ||
579 | if (current_attr.flavor != FL_PARAMETER && gfc_pure (NULL)) | |
580 | { | |
581 | gfc_error | |
582 | ("Initialization of variable at %C is not allowed in a " | |
583 | "PURE procedure"); | |
584 | m = MATCH_ERROR; | |
585 | } | |
586 | ||
587 | if (m != MATCH_YES) | |
588 | goto cleanup; | |
589 | } | |
cb44ab82 VL |
590 | } |
591 | ||
54b4ba60 | 592 | /* Add the initializer. Note that it is fine if initializer is |
6de9cd9a DN |
593 | NULL here, because we sometimes also need to check if a |
594 | declaration *must* have an initialization expression. */ | |
595 | if (gfc_current_state () != COMP_DERIVED) | |
596 | t = add_init_expr_to_sym (name, &initializer, &var_locus); | |
597 | else | |
54b4ba60 PB |
598 | { |
599 | if (current_ts.type == BT_DERIVED && !initializer) | |
600 | initializer = gfc_default_initializer (¤t_ts); | |
601 | t = build_struct (name, cl, &initializer, &as); | |
602 | } | |
6de9cd9a DN |
603 | |
604 | m = (t == SUCCESS) ? MATCH_YES : MATCH_ERROR; | |
605 | ||
606 | cleanup: | |
607 | /* Free stuff up and return. */ | |
608 | gfc_free_expr (initializer); | |
609 | gfc_free_array_spec (as); | |
610 | ||
611 | return m; | |
612 | } | |
613 | ||
614 | ||
615 | /* Match an extended-f77 kind specification. */ | |
616 | ||
617 | match | |
618 | gfc_match_old_kind_spec (gfc_typespec * ts) | |
619 | { | |
620 | match m; | |
621 | ||
622 | if (gfc_match_char ('*') != MATCH_YES) | |
623 | return MATCH_NO; | |
624 | ||
625 | m = gfc_match_small_literal_int (&ts->kind); | |
626 | if (m != MATCH_YES) | |
627 | return MATCH_ERROR; | |
628 | ||
629 | /* Massage the kind numbers for complex types. */ | |
630 | if (ts->type == BT_COMPLEX && ts->kind == 8) | |
631 | ts->kind = 4; | |
632 | if (ts->type == BT_COMPLEX && ts->kind == 16) | |
633 | ts->kind = 8; | |
634 | ||
635 | if (gfc_validate_kind (ts->type, ts->kind) == -1) | |
636 | { | |
637 | gfc_error ("Old-style kind %d not supported for type %s at %C", | |
638 | ts->kind, gfc_basic_typename (ts->type)); | |
639 | ||
640 | return MATCH_ERROR; | |
641 | } | |
642 | ||
643 | return MATCH_YES; | |
644 | } | |
645 | ||
646 | ||
647 | /* Match a kind specification. Since kinds are generally optional, we | |
648 | usually return MATCH_NO if something goes wrong. If a "kind=" | |
649 | string is found, then we know we have an error. */ | |
650 | ||
651 | match | |
652 | gfc_match_kind_spec (gfc_typespec * ts) | |
653 | { | |
654 | locus where; | |
655 | gfc_expr *e; | |
656 | match m, n; | |
657 | const char *msg; | |
658 | ||
659 | m = MATCH_NO; | |
660 | e = NULL; | |
661 | ||
63645982 | 662 | where = gfc_current_locus; |
6de9cd9a DN |
663 | |
664 | if (gfc_match_char ('(') == MATCH_NO) | |
665 | return MATCH_NO; | |
666 | ||
667 | /* Also gobbles optional text. */ | |
668 | if (gfc_match (" kind = ") == MATCH_YES) | |
669 | m = MATCH_ERROR; | |
670 | ||
671 | n = gfc_match_init_expr (&e); | |
672 | if (n == MATCH_NO) | |
673 | gfc_error ("Expected initialization expression at %C"); | |
674 | if (n != MATCH_YES) | |
675 | return MATCH_ERROR; | |
676 | ||
677 | if (e->rank != 0) | |
678 | { | |
679 | gfc_error ("Expected scalar initialization expression at %C"); | |
680 | m = MATCH_ERROR; | |
681 | goto no_match; | |
682 | } | |
683 | ||
684 | msg = gfc_extract_int (e, &ts->kind); | |
685 | if (msg != NULL) | |
686 | { | |
687 | gfc_error (msg); | |
688 | m = MATCH_ERROR; | |
689 | goto no_match; | |
690 | } | |
691 | ||
692 | gfc_free_expr (e); | |
693 | e = NULL; | |
694 | ||
695 | if (gfc_validate_kind (ts->type, ts->kind) == -1) | |
696 | { | |
697 | gfc_error ("Kind %d not supported for type %s at %C", ts->kind, | |
698 | gfc_basic_typename (ts->type)); | |
699 | ||
700 | m = MATCH_ERROR; | |
701 | goto no_match; | |
702 | } | |
703 | ||
704 | if (gfc_match_char (')') != MATCH_YES) | |
705 | { | |
706 | gfc_error ("Missing right paren at %C"); | |
707 | goto no_match; | |
708 | } | |
709 | ||
710 | return MATCH_YES; | |
711 | ||
712 | no_match: | |
713 | gfc_free_expr (e); | |
63645982 | 714 | gfc_current_locus = where; |
6de9cd9a DN |
715 | return m; |
716 | } | |
717 | ||
718 | ||
719 | /* Match the various kind/length specifications in a CHARACTER | |
720 | declaration. We don't return MATCH_NO. */ | |
721 | ||
722 | static match | |
723 | match_char_spec (gfc_typespec * ts) | |
724 | { | |
725 | int i, kind, seen_length; | |
726 | gfc_charlen *cl; | |
727 | gfc_expr *len; | |
728 | match m; | |
729 | ||
730 | kind = gfc_default_character_kind (); | |
731 | len = NULL; | |
732 | seen_length = 0; | |
733 | ||
734 | /* Try the old-style specification first. */ | |
735 | old_char_selector = 0; | |
736 | ||
737 | m = match_char_length (&len); | |
738 | if (m != MATCH_NO) | |
739 | { | |
740 | if (m == MATCH_YES) | |
741 | old_char_selector = 1; | |
742 | seen_length = 1; | |
743 | goto done; | |
744 | } | |
745 | ||
746 | m = gfc_match_char ('('); | |
747 | if (m != MATCH_YES) | |
748 | { | |
749 | m = MATCH_YES; /* character without length is a single char */ | |
750 | goto done; | |
751 | } | |
752 | ||
753 | /* Try the weird case: ( KIND = <int> [ , LEN = <len-param> ] ) */ | |
754 | if (gfc_match (" kind =") == MATCH_YES) | |
755 | { | |
756 | m = gfc_match_small_int (&kind); | |
757 | if (m == MATCH_ERROR) | |
758 | goto done; | |
759 | if (m == MATCH_NO) | |
760 | goto syntax; | |
761 | ||
762 | if (gfc_match (" , len =") == MATCH_NO) | |
763 | goto rparen; | |
764 | ||
765 | m = char_len_param_value (&len); | |
766 | if (m == MATCH_NO) | |
767 | goto syntax; | |
768 | if (m == MATCH_ERROR) | |
769 | goto done; | |
770 | seen_length = 1; | |
771 | ||
772 | goto rparen; | |
773 | } | |
774 | ||
775 | /* Try to match ( LEN = <len-param> ) or ( LEN = <len-param>, KIND = <int> ) */ | |
776 | if (gfc_match (" len =") == MATCH_YES) | |
777 | { | |
778 | m = char_len_param_value (&len); | |
779 | if (m == MATCH_NO) | |
780 | goto syntax; | |
781 | if (m == MATCH_ERROR) | |
782 | goto done; | |
783 | seen_length = 1; | |
784 | ||
785 | if (gfc_match_char (')') == MATCH_YES) | |
786 | goto done; | |
787 | ||
788 | if (gfc_match (" , kind =") != MATCH_YES) | |
789 | goto syntax; | |
790 | ||
791 | gfc_match_small_int (&kind); | |
792 | ||
793 | if (gfc_validate_kind (BT_CHARACTER, kind) == -1) | |
794 | { | |
795 | gfc_error ("Kind %d is not a CHARACTER kind at %C", kind); | |
796 | return MATCH_YES; | |
797 | } | |
798 | ||
799 | goto rparen; | |
800 | } | |
801 | ||
802 | /* Try to match ( <len-param> ) or ( <len-param> , [ KIND = ] <int> ) */ | |
803 | m = char_len_param_value (&len); | |
804 | if (m == MATCH_NO) | |
805 | goto syntax; | |
806 | if (m == MATCH_ERROR) | |
807 | goto done; | |
808 | seen_length = 1; | |
809 | ||
810 | m = gfc_match_char (')'); | |
811 | if (m == MATCH_YES) | |
812 | goto done; | |
813 | ||
814 | if (gfc_match_char (',') != MATCH_YES) | |
815 | goto syntax; | |
816 | ||
817 | gfc_match (" kind ="); /* Gobble optional text */ | |
818 | ||
819 | m = gfc_match_small_int (&kind); | |
820 | if (m == MATCH_ERROR) | |
821 | goto done; | |
822 | if (m == MATCH_NO) | |
823 | goto syntax; | |
824 | ||
825 | rparen: | |
826 | /* Require a right-paren at this point. */ | |
827 | m = gfc_match_char (')'); | |
828 | if (m == MATCH_YES) | |
829 | goto done; | |
830 | ||
831 | syntax: | |
832 | gfc_error ("Syntax error in CHARACTER declaration at %C"); | |
833 | m = MATCH_ERROR; | |
834 | ||
835 | done: | |
836 | if (m == MATCH_YES && gfc_validate_kind (BT_CHARACTER, kind) == -1) | |
837 | { | |
838 | gfc_error ("Kind %d is not a CHARACTER kind at %C", kind); | |
839 | m = MATCH_ERROR; | |
840 | } | |
841 | ||
842 | if (m != MATCH_YES) | |
843 | { | |
844 | gfc_free_expr (len); | |
845 | return m; | |
846 | } | |
847 | ||
848 | /* Do some final massaging of the length values. */ | |
849 | cl = gfc_get_charlen (); | |
850 | cl->next = gfc_current_ns->cl_list; | |
851 | gfc_current_ns->cl_list = cl; | |
852 | ||
853 | if (seen_length == 0) | |
854 | cl->length = gfc_int_expr (1); | |
855 | else | |
856 | { | |
857 | if (len == NULL || gfc_extract_int (len, &i) != NULL || i >= 0) | |
858 | cl->length = len; | |
859 | else | |
860 | { | |
861 | gfc_free_expr (len); | |
862 | cl->length = gfc_int_expr (0); | |
863 | } | |
864 | } | |
865 | ||
866 | ts->cl = cl; | |
867 | ts->kind = kind; | |
868 | ||
869 | return MATCH_YES; | |
870 | } | |
871 | ||
872 | ||
873 | /* Matches a type specification. If successful, sets the ts structure | |
874 | to the matched specification. This is necessary for FUNCTION and | |
875 | IMPLICIT statements. | |
876 | ||
877 | If kind_flag is nonzero, then we check for the optional kind | |
878 | specification. Not doing so is needed for matching an IMPLICIT | |
879 | statement correctly. */ | |
880 | ||
881 | match | |
882 | gfc_match_type_spec (gfc_typespec * ts, int kind_flag) | |
883 | { | |
884 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
885 | gfc_symbol *sym; | |
886 | match m; | |
887 | ||
888 | gfc_clear_ts (ts); | |
889 | ||
890 | if (gfc_match (" integer") == MATCH_YES) | |
891 | { | |
892 | ts->type = BT_INTEGER; | |
893 | ts->kind = gfc_default_integer_kind (); | |
894 | goto get_kind; | |
895 | } | |
896 | ||
897 | if (gfc_match (" character") == MATCH_YES) | |
898 | { | |
899 | ts->type = BT_CHARACTER; | |
900 | return match_char_spec (ts); | |
901 | } | |
902 | ||
903 | if (gfc_match (" real") == MATCH_YES) | |
904 | { | |
905 | ts->type = BT_REAL; | |
906 | ts->kind = gfc_default_real_kind (); | |
907 | goto get_kind; | |
908 | } | |
909 | ||
910 | if (gfc_match (" double precision") == MATCH_YES) | |
911 | { | |
912 | ts->type = BT_REAL; | |
913 | ts->kind = gfc_default_double_kind (); | |
914 | return MATCH_YES; | |
915 | } | |
916 | ||
917 | if (gfc_match (" complex") == MATCH_YES) | |
918 | { | |
919 | ts->type = BT_COMPLEX; | |
920 | ts->kind = gfc_default_complex_kind (); | |
921 | goto get_kind; | |
922 | } | |
923 | ||
924 | if (gfc_match (" double complex") == MATCH_YES) | |
925 | { | |
926 | ts->type = BT_COMPLEX; | |
927 | ts->kind = gfc_default_double_kind (); | |
928 | return MATCH_YES; | |
929 | } | |
930 | ||
931 | if (gfc_match (" logical") == MATCH_YES) | |
932 | { | |
933 | ts->type = BT_LOGICAL; | |
934 | ts->kind = gfc_default_logical_kind (); | |
935 | goto get_kind; | |
936 | } | |
937 | ||
938 | m = gfc_match (" type ( %n )", name); | |
939 | if (m != MATCH_YES) | |
940 | return m; | |
941 | ||
942 | /* Search for the name but allow the components to be defined later. */ | |
943 | if (gfc_get_ha_symbol (name, &sym)) | |
944 | { | |
945 | gfc_error ("Type name '%s' at %C is ambiguous", name); | |
946 | return MATCH_ERROR; | |
947 | } | |
948 | ||
949 | if (sym->attr.flavor != FL_DERIVED | |
950 | && gfc_add_flavor (&sym->attr, FL_DERIVED, NULL) == FAILURE) | |
951 | return MATCH_ERROR; | |
952 | ||
953 | ts->type = BT_DERIVED; | |
954 | ts->kind = 0; | |
955 | ts->derived = sym; | |
956 | ||
957 | return MATCH_YES; | |
958 | ||
959 | get_kind: | |
960 | /* For all types except double, derived and character, look for an | |
961 | optional kind specifier. MATCH_NO is actually OK at this point. */ | |
962 | if (kind_flag == 0) | |
963 | return MATCH_YES; | |
964 | ||
965 | m = gfc_match_kind_spec (ts); | |
966 | if (m == MATCH_NO && ts->type != BT_CHARACTER) | |
967 | m = gfc_match_old_kind_spec (ts); | |
968 | ||
969 | if (m == MATCH_NO) | |
970 | m = MATCH_YES; /* No kind specifier found. */ | |
971 | ||
972 | return m; | |
973 | } | |
974 | ||
975 | ||
976 | /* Matches an attribute specification including array specs. If | |
977 | successful, leaves the variables current_attr and current_as | |
978 | holding the specification. Also sets the colon_seen variable for | |
979 | later use by matchers associated with initializations. | |
980 | ||
981 | This subroutine is a little tricky in the sense that we don't know | |
982 | if we really have an attr-spec until we hit the double colon. | |
983 | Until that time, we can only return MATCH_NO. This forces us to | |
984 | check for duplicate specification at this level. */ | |
985 | ||
986 | static match | |
987 | match_attr_spec (void) | |
988 | { | |
989 | ||
990 | /* Modifiers that can exist in a type statement. */ | |
991 | typedef enum | |
992 | { GFC_DECL_BEGIN = 0, | |
993 | DECL_ALLOCATABLE = GFC_DECL_BEGIN, DECL_DIMENSION, DECL_EXTERNAL, | |
994 | DECL_IN, DECL_OUT, DECL_INOUT, DECL_INTRINSIC, DECL_OPTIONAL, | |
995 | DECL_PARAMETER, DECL_POINTER, DECL_PRIVATE, DECL_PUBLIC, DECL_SAVE, | |
996 | DECL_TARGET, DECL_COLON, DECL_NONE, | |
997 | GFC_DECL_END /* Sentinel */ | |
998 | } | |
999 | decl_types; | |
1000 | ||
1001 | /* GFC_DECL_END is the sentinel, index starts at 0. */ | |
1002 | #define NUM_DECL GFC_DECL_END | |
1003 | ||
1004 | static mstring decls[] = { | |
1005 | minit (", allocatable", DECL_ALLOCATABLE), | |
1006 | minit (", dimension", DECL_DIMENSION), | |
1007 | minit (", external", DECL_EXTERNAL), | |
1008 | minit (", intent ( in )", DECL_IN), | |
1009 | minit (", intent ( out )", DECL_OUT), | |
1010 | minit (", intent ( in out )", DECL_INOUT), | |
1011 | minit (", intrinsic", DECL_INTRINSIC), | |
1012 | minit (", optional", DECL_OPTIONAL), | |
1013 | minit (", parameter", DECL_PARAMETER), | |
1014 | minit (", pointer", DECL_POINTER), | |
1015 | minit (", private", DECL_PRIVATE), | |
1016 | minit (", public", DECL_PUBLIC), | |
1017 | minit (", save", DECL_SAVE), | |
1018 | minit (", target", DECL_TARGET), | |
1019 | minit ("::", DECL_COLON), | |
1020 | minit (NULL, DECL_NONE) | |
1021 | }; | |
1022 | ||
1023 | locus start, seen_at[NUM_DECL]; | |
1024 | int seen[NUM_DECL]; | |
1025 | decl_types d; | |
1026 | const char *attr; | |
1027 | match m; | |
1028 | try t; | |
1029 | ||
1030 | gfc_clear_attr (¤t_attr); | |
63645982 | 1031 | start = gfc_current_locus; |
6de9cd9a DN |
1032 | |
1033 | current_as = NULL; | |
1034 | colon_seen = 0; | |
1035 | ||
1036 | /* See if we get all of the keywords up to the final double colon. */ | |
1037 | for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++) | |
1038 | seen[d] = 0; | |
1039 | ||
1040 | for (;;) | |
1041 | { | |
1042 | d = (decl_types) gfc_match_strings (decls); | |
1043 | if (d == DECL_NONE || d == DECL_COLON) | |
1044 | break; | |
1045 | ||
1046 | seen[d]++; | |
63645982 | 1047 | seen_at[d] = gfc_current_locus; |
6de9cd9a DN |
1048 | |
1049 | if (d == DECL_DIMENSION) | |
1050 | { | |
1051 | m = gfc_match_array_spec (¤t_as); | |
1052 | ||
1053 | if (m == MATCH_NO) | |
1054 | { | |
1055 | gfc_error ("Missing dimension specification at %C"); | |
1056 | m = MATCH_ERROR; | |
1057 | } | |
1058 | ||
1059 | if (m == MATCH_ERROR) | |
1060 | goto cleanup; | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | /* No double colon, so assume that we've been looking at something | |
1065 | else the whole time. */ | |
1066 | if (d == DECL_NONE) | |
1067 | { | |
1068 | m = MATCH_NO; | |
1069 | goto cleanup; | |
1070 | } | |
1071 | ||
1072 | /* Since we've seen a double colon, we have to be looking at an | |
1073 | attr-spec. This means that we can now issue errors. */ | |
1074 | for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++) | |
1075 | if (seen[d] > 1) | |
1076 | { | |
1077 | switch (d) | |
1078 | { | |
1079 | case DECL_ALLOCATABLE: | |
1080 | attr = "ALLOCATABLE"; | |
1081 | break; | |
1082 | case DECL_DIMENSION: | |
1083 | attr = "DIMENSION"; | |
1084 | break; | |
1085 | case DECL_EXTERNAL: | |
1086 | attr = "EXTERNAL"; | |
1087 | break; | |
1088 | case DECL_IN: | |
1089 | attr = "INTENT (IN)"; | |
1090 | break; | |
1091 | case DECL_OUT: | |
1092 | attr = "INTENT (OUT)"; | |
1093 | break; | |
1094 | case DECL_INOUT: | |
1095 | attr = "INTENT (IN OUT)"; | |
1096 | break; | |
1097 | case DECL_INTRINSIC: | |
1098 | attr = "INTRINSIC"; | |
1099 | break; | |
1100 | case DECL_OPTIONAL: | |
1101 | attr = "OPTIONAL"; | |
1102 | break; | |
1103 | case DECL_PARAMETER: | |
1104 | attr = "PARAMETER"; | |
1105 | break; | |
1106 | case DECL_POINTER: | |
1107 | attr = "POINTER"; | |
1108 | break; | |
1109 | case DECL_PRIVATE: | |
1110 | attr = "PRIVATE"; | |
1111 | break; | |
1112 | case DECL_PUBLIC: | |
1113 | attr = "PUBLIC"; | |
1114 | break; | |
1115 | case DECL_SAVE: | |
1116 | attr = "SAVE"; | |
1117 | break; | |
1118 | case DECL_TARGET: | |
1119 | attr = "TARGET"; | |
1120 | break; | |
1121 | default: | |
1122 | attr = NULL; /* This shouldn't happen */ | |
1123 | } | |
1124 | ||
1125 | gfc_error ("Duplicate %s attribute at %L", attr, &seen_at[d]); | |
1126 | m = MATCH_ERROR; | |
1127 | goto cleanup; | |
1128 | } | |
1129 | ||
1130 | /* Now that we've dealt with duplicate attributes, add the attributes | |
1131 | to the current attribute. */ | |
1132 | for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++) | |
1133 | { | |
1134 | if (seen[d] == 0) | |
1135 | continue; | |
1136 | ||
1137 | if (gfc_current_state () == COMP_DERIVED | |
1138 | && d != DECL_DIMENSION && d != DECL_POINTER | |
1139 | && d != DECL_COLON && d != DECL_NONE) | |
1140 | { | |
1141 | ||
1142 | gfc_error ("Attribute at %L is not allowed in a TYPE definition", | |
1143 | &seen_at[d]); | |
1144 | m = MATCH_ERROR; | |
1145 | goto cleanup; | |
1146 | } | |
1147 | ||
1148 | switch (d) | |
1149 | { | |
1150 | case DECL_ALLOCATABLE: | |
1151 | t = gfc_add_allocatable (¤t_attr, &seen_at[d]); | |
1152 | break; | |
1153 | ||
1154 | case DECL_DIMENSION: | |
1155 | t = gfc_add_dimension (¤t_attr, &seen_at[d]); | |
1156 | break; | |
1157 | ||
1158 | case DECL_EXTERNAL: | |
1159 | t = gfc_add_external (¤t_attr, &seen_at[d]); | |
1160 | break; | |
1161 | ||
1162 | case DECL_IN: | |
1163 | t = gfc_add_intent (¤t_attr, INTENT_IN, &seen_at[d]); | |
1164 | break; | |
1165 | ||
1166 | case DECL_OUT: | |
1167 | t = gfc_add_intent (¤t_attr, INTENT_OUT, &seen_at[d]); | |
1168 | break; | |
1169 | ||
1170 | case DECL_INOUT: | |
1171 | t = gfc_add_intent (¤t_attr, INTENT_INOUT, &seen_at[d]); | |
1172 | break; | |
1173 | ||
1174 | case DECL_INTRINSIC: | |
1175 | t = gfc_add_intrinsic (¤t_attr, &seen_at[d]); | |
1176 | break; | |
1177 | ||
1178 | case DECL_OPTIONAL: | |
1179 | t = gfc_add_optional (¤t_attr, &seen_at[d]); | |
1180 | break; | |
1181 | ||
1182 | case DECL_PARAMETER: | |
1183 | t = gfc_add_flavor (¤t_attr, FL_PARAMETER, &seen_at[d]); | |
1184 | break; | |
1185 | ||
1186 | case DECL_POINTER: | |
1187 | t = gfc_add_pointer (¤t_attr, &seen_at[d]); | |
1188 | break; | |
1189 | ||
1190 | case DECL_PRIVATE: | |
1191 | t = gfc_add_access (¤t_attr, ACCESS_PRIVATE, &seen_at[d]); | |
1192 | break; | |
1193 | ||
1194 | case DECL_PUBLIC: | |
1195 | t = gfc_add_access (¤t_attr, ACCESS_PUBLIC, &seen_at[d]); | |
1196 | break; | |
1197 | ||
1198 | case DECL_SAVE: | |
1199 | t = gfc_add_save (¤t_attr, &seen_at[d]); | |
1200 | break; | |
1201 | ||
1202 | case DECL_TARGET: | |
1203 | t = gfc_add_target (¤t_attr, &seen_at[d]); | |
1204 | break; | |
1205 | ||
1206 | default: | |
1207 | gfc_internal_error ("match_attr_spec(): Bad attribute"); | |
1208 | } | |
1209 | ||
1210 | if (t == FAILURE) | |
1211 | { | |
1212 | m = MATCH_ERROR; | |
1213 | goto cleanup; | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | colon_seen = 1; | |
1218 | return MATCH_YES; | |
1219 | ||
1220 | cleanup: | |
63645982 | 1221 | gfc_current_locus = start; |
6de9cd9a DN |
1222 | gfc_free_array_spec (current_as); |
1223 | current_as = NULL; | |
1224 | return m; | |
1225 | } | |
1226 | ||
1227 | ||
1228 | /* Match a data declaration statement. */ | |
1229 | ||
1230 | match | |
1231 | gfc_match_data_decl (void) | |
1232 | { | |
1233 | gfc_symbol *sym; | |
1234 | match m; | |
1235 | ||
1236 | m = gfc_match_type_spec (¤t_ts, 1); | |
1237 | if (m != MATCH_YES) | |
1238 | return m; | |
1239 | ||
1240 | if (current_ts.type == BT_DERIVED && gfc_current_state () != COMP_DERIVED) | |
1241 | { | |
1242 | sym = gfc_use_derived (current_ts.derived); | |
1243 | ||
1244 | if (sym == NULL) | |
1245 | { | |
1246 | m = MATCH_ERROR; | |
1247 | goto cleanup; | |
1248 | } | |
1249 | ||
1250 | current_ts.derived = sym; | |
1251 | } | |
1252 | ||
1253 | m = match_attr_spec (); | |
1254 | if (m == MATCH_ERROR) | |
1255 | { | |
1256 | m = MATCH_NO; | |
1257 | goto cleanup; | |
1258 | } | |
1259 | ||
1260 | if (current_ts.type == BT_DERIVED && current_ts.derived->components == NULL) | |
1261 | { | |
1262 | ||
1263 | if (current_attr.pointer && gfc_current_state () == COMP_DERIVED) | |
1264 | goto ok; | |
1265 | ||
1266 | if (gfc_find_symbol (current_ts.derived->name, | |
1267 | current_ts.derived->ns->parent, 1, &sym) == 0) | |
1268 | goto ok; | |
1269 | ||
1270 | /* Hope that an ambiguous symbol is itself masked by a type definition. */ | |
1271 | if (sym != NULL && sym->attr.flavor == FL_DERIVED) | |
1272 | goto ok; | |
1273 | ||
1274 | gfc_error ("Derived type at %C has not been previously defined"); | |
1275 | m = MATCH_ERROR; | |
1276 | goto cleanup; | |
1277 | } | |
1278 | ||
1279 | ok: | |
1280 | /* If we have an old-style character declaration, and no new-style | |
1281 | attribute specifications, then there a comma is optional between | |
1282 | the type specification and the variable list. */ | |
1283 | if (m == MATCH_NO && current_ts.type == BT_CHARACTER && old_char_selector) | |
1284 | gfc_match_char (','); | |
1285 | ||
1286 | /* Give the types/attributes to symbols that follow. */ | |
1287 | for (;;) | |
1288 | { | |
1289 | m = variable_decl (); | |
1290 | if (m == MATCH_ERROR) | |
1291 | goto cleanup; | |
1292 | if (m == MATCH_NO) | |
1293 | break; | |
1294 | ||
1295 | if (gfc_match_eos () == MATCH_YES) | |
1296 | goto cleanup; | |
1297 | if (gfc_match_char (',') != MATCH_YES) | |
1298 | break; | |
1299 | } | |
1300 | ||
1301 | gfc_error ("Syntax error in data declaration at %C"); | |
1302 | m = MATCH_ERROR; | |
1303 | ||
1304 | cleanup: | |
1305 | gfc_free_array_spec (current_as); | |
1306 | current_as = NULL; | |
1307 | return m; | |
1308 | } | |
1309 | ||
1310 | ||
1311 | /* Match a prefix associated with a function or subroutine | |
1312 | declaration. If the typespec pointer is nonnull, then a typespec | |
1313 | can be matched. Note that if nothing matches, MATCH_YES is | |
1314 | returned (the null string was matched). */ | |
1315 | ||
1316 | static match | |
1317 | match_prefix (gfc_typespec * ts) | |
1318 | { | |
1319 | int seen_type; | |
1320 | ||
1321 | gfc_clear_attr (¤t_attr); | |
1322 | seen_type = 0; | |
1323 | ||
1324 | loop: | |
1325 | if (!seen_type && ts != NULL | |
1326 | && gfc_match_type_spec (ts, 1) == MATCH_YES | |
1327 | && gfc_match_space () == MATCH_YES) | |
1328 | { | |
1329 | ||
1330 | seen_type = 1; | |
1331 | goto loop; | |
1332 | } | |
1333 | ||
1334 | if (gfc_match ("elemental% ") == MATCH_YES) | |
1335 | { | |
1336 | if (gfc_add_elemental (¤t_attr, NULL) == FAILURE) | |
1337 | return MATCH_ERROR; | |
1338 | ||
1339 | goto loop; | |
1340 | } | |
1341 | ||
1342 | if (gfc_match ("pure% ") == MATCH_YES) | |
1343 | { | |
1344 | if (gfc_add_pure (¤t_attr, NULL) == FAILURE) | |
1345 | return MATCH_ERROR; | |
1346 | ||
1347 | goto loop; | |
1348 | } | |
1349 | ||
1350 | if (gfc_match ("recursive% ") == MATCH_YES) | |
1351 | { | |
1352 | if (gfc_add_recursive (¤t_attr, NULL) == FAILURE) | |
1353 | return MATCH_ERROR; | |
1354 | ||
1355 | goto loop; | |
1356 | } | |
1357 | ||
1358 | /* At this point, the next item is not a prefix. */ | |
1359 | return MATCH_YES; | |
1360 | } | |
1361 | ||
1362 | ||
1363 | /* Copy attributes matched by match_prefix() to attributes on a symbol. */ | |
1364 | ||
1365 | static try | |
1366 | copy_prefix (symbol_attribute * dest, locus * where) | |
1367 | { | |
1368 | ||
1369 | if (current_attr.pure && gfc_add_pure (dest, where) == FAILURE) | |
1370 | return FAILURE; | |
1371 | ||
1372 | if (current_attr.elemental && gfc_add_elemental (dest, where) == FAILURE) | |
1373 | return FAILURE; | |
1374 | ||
1375 | if (current_attr.recursive && gfc_add_recursive (dest, where) == FAILURE) | |
1376 | return FAILURE; | |
1377 | ||
1378 | return SUCCESS; | |
1379 | } | |
1380 | ||
1381 | ||
1382 | /* Match a formal argument list. */ | |
1383 | ||
1384 | match | |
1385 | gfc_match_formal_arglist (gfc_symbol * progname, int st_flag, int null_flag) | |
1386 | { | |
1387 | gfc_formal_arglist *head, *tail, *p, *q; | |
1388 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
1389 | gfc_symbol *sym; | |
1390 | match m; | |
1391 | ||
1392 | head = tail = NULL; | |
1393 | ||
1394 | if (gfc_match_char ('(') != MATCH_YES) | |
1395 | { | |
1396 | if (null_flag) | |
1397 | goto ok; | |
1398 | return MATCH_NO; | |
1399 | } | |
1400 | ||
1401 | if (gfc_match_char (')') == MATCH_YES) | |
1402 | goto ok; | |
1403 | ||
1404 | for (;;) | |
1405 | { | |
1406 | if (gfc_match_char ('*') == MATCH_YES) | |
1407 | sym = NULL; | |
1408 | else | |
1409 | { | |
1410 | m = gfc_match_name (name); | |
1411 | if (m != MATCH_YES) | |
1412 | goto cleanup; | |
1413 | ||
1414 | if (gfc_get_symbol (name, NULL, &sym)) | |
1415 | goto cleanup; | |
1416 | } | |
1417 | ||
1418 | p = gfc_get_formal_arglist (); | |
1419 | ||
1420 | if (head == NULL) | |
1421 | head = tail = p; | |
1422 | else | |
1423 | { | |
1424 | tail->next = p; | |
1425 | tail = p; | |
1426 | } | |
1427 | ||
1428 | tail->sym = sym; | |
1429 | ||
1430 | /* We don't add the VARIABLE flavor because the name could be a | |
1431 | dummy procedure. We don't apply these attributes to formal | |
1432 | arguments of statement functions. */ | |
1433 | if (sym != NULL && !st_flag | |
1434 | && (gfc_add_dummy (&sym->attr, NULL) == FAILURE | |
1435 | || gfc_missing_attr (&sym->attr, NULL) == FAILURE)) | |
1436 | { | |
1437 | m = MATCH_ERROR; | |
1438 | goto cleanup; | |
1439 | } | |
1440 | ||
1441 | /* The name of a program unit can be in a different namespace, | |
1442 | so check for it explicitly. After the statement is accepted, | |
1443 | the name is checked for especially in gfc_get_symbol(). */ | |
1444 | if (gfc_new_block != NULL && sym != NULL | |
1445 | && strcmp (sym->name, gfc_new_block->name) == 0) | |
1446 | { | |
1447 | gfc_error ("Name '%s' at %C is the name of the procedure", | |
1448 | sym->name); | |
1449 | m = MATCH_ERROR; | |
1450 | goto cleanup; | |
1451 | } | |
1452 | ||
1453 | if (gfc_match_char (')') == MATCH_YES) | |
1454 | goto ok; | |
1455 | ||
1456 | m = gfc_match_char (','); | |
1457 | if (m != MATCH_YES) | |
1458 | { | |
1459 | gfc_error ("Unexpected junk in formal argument list at %C"); | |
1460 | goto cleanup; | |
1461 | } | |
1462 | } | |
1463 | ||
1464 | ok: | |
1465 | /* Check for duplicate symbols in the formal argument list. */ | |
1466 | if (head != NULL) | |
1467 | { | |
1468 | for (p = head; p->next; p = p->next) | |
1469 | { | |
1470 | if (p->sym == NULL) | |
1471 | continue; | |
1472 | ||
1473 | for (q = p->next; q; q = q->next) | |
1474 | if (p->sym == q->sym) | |
1475 | { | |
1476 | gfc_error | |
1477 | ("Duplicate symbol '%s' in formal argument list at %C", | |
1478 | p->sym->name); | |
1479 | ||
1480 | m = MATCH_ERROR; | |
1481 | goto cleanup; | |
1482 | } | |
1483 | } | |
1484 | } | |
1485 | ||
1486 | if (gfc_add_explicit_interface (progname, IFSRC_DECL, head, NULL) == | |
1487 | FAILURE) | |
1488 | { | |
1489 | m = MATCH_ERROR; | |
1490 | goto cleanup; | |
1491 | } | |
1492 | ||
1493 | return MATCH_YES; | |
1494 | ||
1495 | cleanup: | |
1496 | gfc_free_formal_arglist (head); | |
1497 | return m; | |
1498 | } | |
1499 | ||
1500 | ||
1501 | /* Match a RESULT specification following a function declaration or | |
1502 | ENTRY statement. Also matches the end-of-statement. */ | |
1503 | ||
1504 | static match | |
1505 | match_result (gfc_symbol * function, gfc_symbol ** result) | |
1506 | { | |
1507 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
1508 | gfc_symbol *r; | |
1509 | match m; | |
1510 | ||
1511 | if (gfc_match (" result (") != MATCH_YES) | |
1512 | return MATCH_NO; | |
1513 | ||
1514 | m = gfc_match_name (name); | |
1515 | if (m != MATCH_YES) | |
1516 | return m; | |
1517 | ||
1518 | if (gfc_match (" )%t") != MATCH_YES) | |
1519 | { | |
1520 | gfc_error ("Unexpected junk following RESULT variable at %C"); | |
1521 | return MATCH_ERROR; | |
1522 | } | |
1523 | ||
1524 | if (strcmp (function->name, name) == 0) | |
1525 | { | |
1526 | gfc_error | |
1527 | ("RESULT variable at %C must be different than function name"); | |
1528 | return MATCH_ERROR; | |
1529 | } | |
1530 | ||
1531 | if (gfc_get_symbol (name, NULL, &r)) | |
1532 | return MATCH_ERROR; | |
1533 | ||
1534 | if (gfc_add_flavor (&r->attr, FL_VARIABLE, NULL) == FAILURE | |
1535 | || gfc_add_result (&r->attr, NULL) == FAILURE) | |
1536 | return MATCH_ERROR; | |
1537 | ||
1538 | *result = r; | |
1539 | ||
1540 | return MATCH_YES; | |
1541 | } | |
1542 | ||
1543 | ||
1544 | /* Match a function declaration. */ | |
1545 | ||
1546 | match | |
1547 | gfc_match_function_decl (void) | |
1548 | { | |
1549 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
1550 | gfc_symbol *sym, *result; | |
1551 | locus old_loc; | |
1552 | match m; | |
1553 | ||
1554 | if (gfc_current_state () != COMP_NONE | |
1555 | && gfc_current_state () != COMP_INTERFACE | |
1556 | && gfc_current_state () != COMP_CONTAINS) | |
1557 | return MATCH_NO; | |
1558 | ||
1559 | gfc_clear_ts (¤t_ts); | |
1560 | ||
63645982 | 1561 | old_loc = gfc_current_locus; |
6de9cd9a DN |
1562 | |
1563 | m = match_prefix (¤t_ts); | |
1564 | if (m != MATCH_YES) | |
1565 | { | |
63645982 | 1566 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1567 | return m; |
1568 | } | |
1569 | ||
1570 | if (gfc_match ("function% %n", name) != MATCH_YES) | |
1571 | { | |
63645982 | 1572 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1573 | return MATCH_NO; |
1574 | } | |
1575 | ||
1576 | if (get_proc_name (name, &sym)) | |
1577 | return MATCH_ERROR; | |
1578 | gfc_new_block = sym; | |
1579 | ||
1580 | m = gfc_match_formal_arglist (sym, 0, 0); | |
1581 | if (m == MATCH_NO) | |
1582 | gfc_error ("Expected formal argument list in function definition at %C"); | |
1583 | else if (m == MATCH_ERROR) | |
1584 | goto cleanup; | |
1585 | ||
1586 | result = NULL; | |
1587 | ||
1588 | if (gfc_match_eos () != MATCH_YES) | |
1589 | { | |
1590 | /* See if a result variable is present. */ | |
1591 | m = match_result (sym, &result); | |
1592 | if (m == MATCH_NO) | |
1593 | gfc_error ("Unexpected junk after function declaration at %C"); | |
1594 | ||
1595 | if (m != MATCH_YES) | |
1596 | { | |
1597 | m = MATCH_ERROR; | |
1598 | goto cleanup; | |
1599 | } | |
1600 | } | |
1601 | ||
1602 | /* Make changes to the symbol. */ | |
1603 | m = MATCH_ERROR; | |
1604 | ||
1605 | if (gfc_add_function (&sym->attr, NULL) == FAILURE) | |
1606 | goto cleanup; | |
1607 | ||
1608 | if (gfc_missing_attr (&sym->attr, NULL) == FAILURE | |
1609 | || copy_prefix (&sym->attr, &sym->declared_at) == FAILURE) | |
1610 | goto cleanup; | |
1611 | ||
1612 | if (current_ts.type != BT_UNKNOWN && sym->ts.type != BT_UNKNOWN) | |
1613 | { | |
1614 | gfc_error ("Function '%s' at %C already has a type of %s", name, | |
1615 | gfc_basic_typename (sym->ts.type)); | |
1616 | goto cleanup; | |
1617 | } | |
1618 | ||
1619 | if (result == NULL) | |
1620 | { | |
1621 | sym->ts = current_ts; | |
1622 | sym->result = sym; | |
1623 | } | |
1624 | else | |
1625 | { | |
1626 | result->ts = current_ts; | |
1627 | sym->result = result; | |
1628 | } | |
1629 | ||
1630 | return MATCH_YES; | |
1631 | ||
1632 | cleanup: | |
63645982 | 1633 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1634 | return m; |
1635 | } | |
1636 | ||
1637 | ||
1638 | /* Match an ENTRY statement. */ | |
1639 | ||
1640 | match | |
1641 | gfc_match_entry (void) | |
1642 | { | |
1643 | gfc_symbol *function, *result, *entry; | |
1644 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
1645 | gfc_compile_state state; | |
1646 | match m; | |
1647 | ||
1648 | m = gfc_match_name (name); | |
1649 | if (m != MATCH_YES) | |
1650 | return m; | |
1651 | ||
1652 | if (get_proc_name (name, &entry)) | |
1653 | return MATCH_ERROR; | |
1654 | ||
1655 | gfc_enclosing_unit (&state); | |
1656 | switch (state) | |
1657 | { | |
1658 | case COMP_SUBROUTINE: | |
1659 | m = gfc_match_formal_arglist (entry, 0, 1); | |
1660 | if (m != MATCH_YES) | |
1661 | return MATCH_ERROR; | |
1662 | ||
1663 | if (gfc_current_state () != COMP_SUBROUTINE) | |
1664 | goto exec_construct; | |
1665 | ||
1666 | if (gfc_add_entry (&entry->attr, NULL) == FAILURE | |
1667 | || gfc_add_subroutine (&entry->attr, NULL) == FAILURE) | |
1668 | return MATCH_ERROR; | |
1669 | ||
1670 | break; | |
1671 | ||
1672 | case COMP_FUNCTION: | |
1673 | m = gfc_match_formal_arglist (entry, 0, 0); | |
1674 | if (m != MATCH_YES) | |
1675 | return MATCH_ERROR; | |
1676 | ||
1677 | if (gfc_current_state () != COMP_FUNCTION) | |
1678 | goto exec_construct; | |
1679 | function = gfc_state_stack->sym; | |
1680 | ||
1681 | result = NULL; | |
1682 | ||
1683 | if (gfc_match_eos () == MATCH_YES) | |
1684 | { | |
1685 | if (gfc_add_entry (&entry->attr, NULL) == FAILURE | |
1686 | || gfc_add_function (&entry->attr, NULL) == FAILURE) | |
1687 | return MATCH_ERROR; | |
1688 | ||
1689 | entry->result = function->result; | |
1690 | ||
1691 | } | |
1692 | else | |
1693 | { | |
1694 | m = match_result (function, &result); | |
1695 | if (m == MATCH_NO) | |
1696 | gfc_syntax_error (ST_ENTRY); | |
1697 | if (m != MATCH_YES) | |
1698 | return MATCH_ERROR; | |
1699 | ||
1700 | if (gfc_add_result (&result->attr, NULL) == FAILURE | |
1701 | || gfc_add_entry (&entry->attr, NULL) == FAILURE | |
1702 | || gfc_add_function (&entry->attr, NULL) == FAILURE) | |
1703 | return MATCH_ERROR; | |
1704 | } | |
1705 | ||
1706 | if (function->attr.recursive && result == NULL) | |
1707 | { | |
1708 | gfc_error ("RESULT attribute required in ENTRY statement at %C"); | |
1709 | return MATCH_ERROR; | |
1710 | } | |
1711 | ||
1712 | break; | |
1713 | ||
1714 | default: | |
1715 | goto exec_construct; | |
1716 | } | |
1717 | ||
1718 | if (gfc_match_eos () != MATCH_YES) | |
1719 | { | |
1720 | gfc_syntax_error (ST_ENTRY); | |
1721 | return MATCH_ERROR; | |
1722 | } | |
1723 | ||
1724 | return MATCH_YES; | |
1725 | ||
1726 | exec_construct: | |
1727 | gfc_error ("ENTRY statement at %C cannot appear within %s", | |
1728 | gfc_state_name (gfc_current_state ())); | |
1729 | ||
1730 | return MATCH_ERROR; | |
1731 | } | |
1732 | ||
1733 | ||
1734 | /* Match a subroutine statement, including optional prefixes. */ | |
1735 | ||
1736 | match | |
1737 | gfc_match_subroutine (void) | |
1738 | { | |
1739 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
1740 | gfc_symbol *sym; | |
1741 | match m; | |
1742 | ||
1743 | if (gfc_current_state () != COMP_NONE | |
1744 | && gfc_current_state () != COMP_INTERFACE | |
1745 | && gfc_current_state () != COMP_CONTAINS) | |
1746 | return MATCH_NO; | |
1747 | ||
1748 | m = match_prefix (NULL); | |
1749 | if (m != MATCH_YES) | |
1750 | return m; | |
1751 | ||
1752 | m = gfc_match ("subroutine% %n", name); | |
1753 | if (m != MATCH_YES) | |
1754 | return m; | |
1755 | ||
1756 | if (get_proc_name (name, &sym)) | |
1757 | return MATCH_ERROR; | |
1758 | gfc_new_block = sym; | |
1759 | ||
1760 | if (gfc_add_subroutine (&sym->attr, NULL) == FAILURE) | |
1761 | return MATCH_ERROR; | |
1762 | ||
1763 | if (gfc_match_formal_arglist (sym, 0, 1) != MATCH_YES) | |
1764 | return MATCH_ERROR; | |
1765 | ||
1766 | if (gfc_match_eos () != MATCH_YES) | |
1767 | { | |
1768 | gfc_syntax_error (ST_SUBROUTINE); | |
1769 | return MATCH_ERROR; | |
1770 | } | |
1771 | ||
1772 | if (copy_prefix (&sym->attr, &sym->declared_at) == FAILURE) | |
1773 | return MATCH_ERROR; | |
1774 | ||
1775 | return MATCH_YES; | |
1776 | } | |
1777 | ||
1778 | ||
1779 | /* Match any of the various end-block statements. Returns the type of | |
1780 | END to the caller. The END INTERFACE, END IF, END DO and END | |
1781 | SELECT statements cannot be replaced by a single END statement. */ | |
1782 | ||
1783 | match | |
1784 | gfc_match_end (gfc_statement * st) | |
1785 | { | |
1786 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
1787 | gfc_compile_state state; | |
1788 | locus old_loc; | |
1789 | const char *block_name; | |
1790 | const char *target; | |
1791 | match m; | |
1792 | ||
63645982 | 1793 | old_loc = gfc_current_locus; |
6de9cd9a DN |
1794 | if (gfc_match ("end") != MATCH_YES) |
1795 | return MATCH_NO; | |
1796 | ||
1797 | state = gfc_current_state (); | |
1798 | block_name = | |
1799 | gfc_current_block () == NULL ? NULL : gfc_current_block ()->name; | |
1800 | ||
1801 | if (state == COMP_CONTAINS) | |
1802 | { | |
1803 | state = gfc_state_stack->previous->state; | |
1804 | block_name = gfc_state_stack->previous->sym == NULL ? NULL | |
1805 | : gfc_state_stack->previous->sym->name; | |
1806 | } | |
1807 | ||
1808 | switch (state) | |
1809 | { | |
1810 | case COMP_NONE: | |
1811 | case COMP_PROGRAM: | |
1812 | *st = ST_END_PROGRAM; | |
1813 | target = " program"; | |
1814 | break; | |
1815 | ||
1816 | case COMP_SUBROUTINE: | |
1817 | *st = ST_END_SUBROUTINE; | |
1818 | target = " subroutine"; | |
1819 | break; | |
1820 | ||
1821 | case COMP_FUNCTION: | |
1822 | *st = ST_END_FUNCTION; | |
1823 | target = " function"; | |
1824 | break; | |
1825 | ||
1826 | case COMP_BLOCK_DATA: | |
1827 | *st = ST_END_BLOCK_DATA; | |
1828 | target = " block data"; | |
1829 | break; | |
1830 | ||
1831 | case COMP_MODULE: | |
1832 | *st = ST_END_MODULE; | |
1833 | target = " module"; | |
1834 | break; | |
1835 | ||
1836 | case COMP_INTERFACE: | |
1837 | *st = ST_END_INTERFACE; | |
1838 | target = " interface"; | |
1839 | break; | |
1840 | ||
1841 | case COMP_DERIVED: | |
1842 | *st = ST_END_TYPE; | |
1843 | target = " type"; | |
1844 | break; | |
1845 | ||
1846 | case COMP_IF: | |
1847 | *st = ST_ENDIF; | |
1848 | target = " if"; | |
1849 | break; | |
1850 | ||
1851 | case COMP_DO: | |
1852 | *st = ST_ENDDO; | |
1853 | target = " do"; | |
1854 | break; | |
1855 | ||
1856 | case COMP_SELECT: | |
1857 | *st = ST_END_SELECT; | |
1858 | target = " select"; | |
1859 | break; | |
1860 | ||
1861 | case COMP_FORALL: | |
1862 | *st = ST_END_FORALL; | |
1863 | target = " forall"; | |
1864 | break; | |
1865 | ||
1866 | case COMP_WHERE: | |
1867 | *st = ST_END_WHERE; | |
1868 | target = " where"; | |
1869 | break; | |
1870 | ||
1871 | default: | |
1872 | gfc_error ("Unexpected END statement at %C"); | |
1873 | goto cleanup; | |
1874 | } | |
1875 | ||
1876 | if (gfc_match_eos () == MATCH_YES) | |
1877 | { | |
c52eae8d | 1878 | state = gfc_current_state (); |
6de9cd9a DN |
1879 | |
1880 | if (*st == ST_ENDIF || *st == ST_ENDDO || *st == ST_END_SELECT | |
1881 | || *st == ST_END_INTERFACE || *st == ST_END_FORALL | |
c52eae8d TS |
1882 | || *st == ST_END_WHERE |
1883 | || /* A contained procedure requires END FUNCTION/SUBROUTINE. */ | |
1884 | ((state == COMP_FUNCTION || state == COMP_SUBROUTINE) | |
1885 | && gfc_state_stack->previous != NULL | |
1886 | && gfc_state_stack->previous->state == COMP_CONTAINS)) | |
6de9cd9a DN |
1887 | { |
1888 | ||
1889 | gfc_error ("%s statement expected at %C", | |
1890 | gfc_ascii_statement (*st)); | |
1891 | goto cleanup; | |
1892 | } | |
1893 | ||
1894 | return MATCH_YES; | |
1895 | } | |
1896 | ||
1897 | /* Verify that we've got the sort of end-block that we're expecting. */ | |
1898 | if (gfc_match (target) != MATCH_YES) | |
1899 | { | |
1900 | gfc_error ("Expecting %s statement at %C", gfc_ascii_statement (*st)); | |
1901 | goto cleanup; | |
1902 | } | |
1903 | ||
1904 | /* If we're at the end, make sure a block name wasn't required. */ | |
1905 | if (gfc_match_eos () == MATCH_YES) | |
1906 | { | |
1907 | ||
1908 | if (*st != ST_ENDDO && *st != ST_ENDIF && *st != ST_END_SELECT) | |
1909 | return MATCH_YES; | |
1910 | ||
1911 | if (gfc_current_block () == NULL) | |
1912 | return MATCH_YES; | |
1913 | ||
1914 | gfc_error ("Expected block name of '%s' in %s statement at %C", | |
1915 | block_name, gfc_ascii_statement (*st)); | |
1916 | ||
1917 | return MATCH_ERROR; | |
1918 | } | |
1919 | ||
1920 | /* END INTERFACE has a special handler for its several possible endings. */ | |
1921 | if (*st == ST_END_INTERFACE) | |
1922 | return gfc_match_end_interface (); | |
1923 | ||
1924 | /* We haven't hit the end of statement, so what is left must be an end-name. */ | |
1925 | m = gfc_match_space (); | |
1926 | if (m == MATCH_YES) | |
1927 | m = gfc_match_name (name); | |
1928 | ||
1929 | if (m == MATCH_NO) | |
1930 | gfc_error ("Expected terminating name at %C"); | |
1931 | if (m != MATCH_YES) | |
1932 | goto cleanup; | |
1933 | ||
1934 | if (block_name == NULL) | |
1935 | goto syntax; | |
1936 | ||
1937 | if (strcmp (name, block_name) != 0) | |
1938 | { | |
1939 | gfc_error ("Expected label '%s' for %s statement at %C", block_name, | |
1940 | gfc_ascii_statement (*st)); | |
1941 | goto cleanup; | |
1942 | } | |
1943 | ||
1944 | if (gfc_match_eos () == MATCH_YES) | |
1945 | return MATCH_YES; | |
1946 | ||
1947 | syntax: | |
1948 | gfc_syntax_error (*st); | |
1949 | ||
1950 | cleanup: | |
63645982 | 1951 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1952 | return MATCH_ERROR; |
1953 | } | |
1954 | ||
1955 | ||
1956 | ||
1957 | /***************** Attribute declaration statements ****************/ | |
1958 | ||
1959 | /* Set the attribute of a single variable. */ | |
1960 | ||
1961 | static match | |
1962 | attr_decl1 (void) | |
1963 | { | |
1964 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
1965 | gfc_array_spec *as; | |
1966 | gfc_symbol *sym; | |
1967 | locus var_locus; | |
1968 | match m; | |
1969 | ||
1970 | as = NULL; | |
1971 | ||
1972 | m = gfc_match_name (name); | |
1973 | if (m != MATCH_YES) | |
1974 | goto cleanup; | |
1975 | ||
1976 | if (find_special (name, &sym)) | |
1977 | return MATCH_ERROR; | |
1978 | ||
63645982 | 1979 | var_locus = gfc_current_locus; |
6de9cd9a DN |
1980 | |
1981 | /* Deal with possible array specification for certain attributes. */ | |
1982 | if (current_attr.dimension | |
1983 | || current_attr.allocatable | |
1984 | || current_attr.pointer | |
1985 | || current_attr.target) | |
1986 | { | |
1987 | m = gfc_match_array_spec (&as); | |
1988 | if (m == MATCH_ERROR) | |
1989 | goto cleanup; | |
1990 | ||
1991 | if (current_attr.dimension && m == MATCH_NO) | |
1992 | { | |
1993 | gfc_error | |
1994 | ("Missing array specification at %L in DIMENSION statement", | |
1995 | &var_locus); | |
1996 | m = MATCH_ERROR; | |
1997 | goto cleanup; | |
1998 | } | |
1999 | ||
2000 | if ((current_attr.allocatable || current_attr.pointer) | |
2001 | && (m == MATCH_YES) && (as->type != AS_DEFERRED)) | |
2002 | { | |
2003 | gfc_error ("Array specification must be deferred at %L", | |
2004 | &var_locus); | |
2005 | m = MATCH_ERROR; | |
2006 | goto cleanup; | |
2007 | } | |
2008 | } | |
2009 | ||
2010 | /* Update symbol table. DIMENSION attribute is set in gfc_set_array_spec(). */ | |
2011 | if (current_attr.dimension == 0 | |
2012 | && gfc_copy_attr (&sym->attr, ¤t_attr, NULL) == FAILURE) | |
2013 | { | |
2014 | m = MATCH_ERROR; | |
2015 | goto cleanup; | |
2016 | } | |
2017 | ||
2018 | if (gfc_set_array_spec (sym, as, &var_locus) == FAILURE) | |
2019 | { | |
2020 | m = MATCH_ERROR; | |
2021 | goto cleanup; | |
2022 | } | |
2023 | ||
2024 | if ((current_attr.external || current_attr.intrinsic) | |
2025 | && sym->attr.flavor != FL_PROCEDURE | |
2026 | && gfc_add_flavor (&sym->attr, FL_PROCEDURE, NULL) == FAILURE) | |
2027 | { | |
2028 | m = MATCH_ERROR; | |
2029 | goto cleanup; | |
2030 | } | |
2031 | ||
2032 | return MATCH_YES; | |
2033 | ||
2034 | cleanup: | |
2035 | gfc_free_array_spec (as); | |
2036 | return m; | |
2037 | } | |
2038 | ||
2039 | ||
2040 | /* Generic attribute declaration subroutine. Used for attributes that | |
2041 | just have a list of names. */ | |
2042 | ||
2043 | static match | |
2044 | attr_decl (void) | |
2045 | { | |
2046 | match m; | |
2047 | ||
2048 | /* Gobble the optional double colon, by simply ignoring the result | |
2049 | of gfc_match(). */ | |
2050 | gfc_match (" ::"); | |
2051 | ||
2052 | for (;;) | |
2053 | { | |
2054 | m = attr_decl1 (); | |
2055 | if (m != MATCH_YES) | |
2056 | break; | |
2057 | ||
2058 | if (gfc_match_eos () == MATCH_YES) | |
2059 | { | |
2060 | m = MATCH_YES; | |
2061 | break; | |
2062 | } | |
2063 | ||
2064 | if (gfc_match_char (',') != MATCH_YES) | |
2065 | { | |
2066 | gfc_error ("Unexpected character in variable list at %C"); | |
2067 | m = MATCH_ERROR; | |
2068 | break; | |
2069 | } | |
2070 | } | |
2071 | ||
2072 | return m; | |
2073 | } | |
2074 | ||
2075 | ||
2076 | match | |
2077 | gfc_match_external (void) | |
2078 | { | |
2079 | ||
2080 | gfc_clear_attr (¤t_attr); | |
2081 | gfc_add_external (¤t_attr, NULL); | |
2082 | ||
2083 | return attr_decl (); | |
2084 | } | |
2085 | ||
2086 | ||
2087 | ||
2088 | match | |
2089 | gfc_match_intent (void) | |
2090 | { | |
2091 | sym_intent intent; | |
2092 | ||
2093 | intent = match_intent_spec (); | |
2094 | if (intent == INTENT_UNKNOWN) | |
2095 | return MATCH_ERROR; | |
2096 | ||
2097 | gfc_clear_attr (¤t_attr); | |
2098 | gfc_add_intent (¤t_attr, intent, NULL); /* Can't fail */ | |
2099 | ||
2100 | return attr_decl (); | |
2101 | } | |
2102 | ||
2103 | ||
2104 | match | |
2105 | gfc_match_intrinsic (void) | |
2106 | { | |
2107 | ||
2108 | gfc_clear_attr (¤t_attr); | |
2109 | gfc_add_intrinsic (¤t_attr, NULL); | |
2110 | ||
2111 | return attr_decl (); | |
2112 | } | |
2113 | ||
2114 | ||
2115 | match | |
2116 | gfc_match_optional (void) | |
2117 | { | |
2118 | ||
2119 | gfc_clear_attr (¤t_attr); | |
2120 | gfc_add_optional (¤t_attr, NULL); | |
2121 | ||
2122 | return attr_decl (); | |
2123 | } | |
2124 | ||
2125 | ||
2126 | match | |
2127 | gfc_match_pointer (void) | |
2128 | { | |
2129 | ||
2130 | gfc_clear_attr (¤t_attr); | |
2131 | gfc_add_pointer (¤t_attr, NULL); | |
2132 | ||
2133 | return attr_decl (); | |
2134 | } | |
2135 | ||
2136 | ||
2137 | match | |
2138 | gfc_match_allocatable (void) | |
2139 | { | |
2140 | ||
2141 | gfc_clear_attr (¤t_attr); | |
2142 | gfc_add_allocatable (¤t_attr, NULL); | |
2143 | ||
2144 | return attr_decl (); | |
2145 | } | |
2146 | ||
2147 | ||
2148 | match | |
2149 | gfc_match_dimension (void) | |
2150 | { | |
2151 | ||
2152 | gfc_clear_attr (¤t_attr); | |
2153 | gfc_add_dimension (¤t_attr, NULL); | |
2154 | ||
2155 | return attr_decl (); | |
2156 | } | |
2157 | ||
2158 | ||
2159 | match | |
2160 | gfc_match_target (void) | |
2161 | { | |
2162 | ||
2163 | gfc_clear_attr (¤t_attr); | |
2164 | gfc_add_target (¤t_attr, NULL); | |
2165 | ||
2166 | return attr_decl (); | |
2167 | } | |
2168 | ||
2169 | ||
2170 | /* Match the list of entities being specified in a PUBLIC or PRIVATE | |
2171 | statement. */ | |
2172 | ||
2173 | static match | |
2174 | access_attr_decl (gfc_statement st) | |
2175 | { | |
2176 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
2177 | interface_type type; | |
2178 | gfc_user_op *uop; | |
2179 | gfc_symbol *sym; | |
2180 | gfc_intrinsic_op operator; | |
2181 | match m; | |
2182 | ||
2183 | if (gfc_match (" ::") == MATCH_NO && gfc_match_space () == MATCH_NO) | |
2184 | goto done; | |
2185 | ||
2186 | for (;;) | |
2187 | { | |
2188 | m = gfc_match_generic_spec (&type, name, &operator); | |
2189 | if (m == MATCH_NO) | |
2190 | goto syntax; | |
2191 | if (m == MATCH_ERROR) | |
2192 | return MATCH_ERROR; | |
2193 | ||
2194 | switch (type) | |
2195 | { | |
2196 | case INTERFACE_NAMELESS: | |
2197 | goto syntax; | |
2198 | ||
2199 | case INTERFACE_GENERIC: | |
2200 | if (gfc_get_symbol (name, NULL, &sym)) | |
2201 | goto done; | |
2202 | ||
2203 | if (gfc_add_access (&sym->attr, | |
2204 | (st == | |
2205 | ST_PUBLIC) ? ACCESS_PUBLIC : ACCESS_PRIVATE, | |
2206 | NULL) == FAILURE) | |
2207 | return MATCH_ERROR; | |
2208 | ||
2209 | break; | |
2210 | ||
2211 | case INTERFACE_INTRINSIC_OP: | |
2212 | if (gfc_current_ns->operator_access[operator] == ACCESS_UNKNOWN) | |
2213 | { | |
2214 | gfc_current_ns->operator_access[operator] = | |
2215 | (st == ST_PUBLIC) ? ACCESS_PUBLIC : ACCESS_PRIVATE; | |
2216 | } | |
2217 | else | |
2218 | { | |
2219 | gfc_error ("Access specification of the %s operator at %C has " | |
2220 | "already been specified", gfc_op2string (operator)); | |
2221 | goto done; | |
2222 | } | |
2223 | ||
2224 | break; | |
2225 | ||
2226 | case INTERFACE_USER_OP: | |
2227 | uop = gfc_get_uop (name); | |
2228 | ||
2229 | if (uop->access == ACCESS_UNKNOWN) | |
2230 | { | |
2231 | uop->access = | |
2232 | (st == ST_PUBLIC) ? ACCESS_PUBLIC : ACCESS_PRIVATE; | |
2233 | } | |
2234 | else | |
2235 | { | |
2236 | gfc_error | |
2237 | ("Access specification of the .%s. operator at %C has " | |
2238 | "already been specified", sym->name); | |
2239 | goto done; | |
2240 | } | |
2241 | ||
2242 | break; | |
2243 | } | |
2244 | ||
2245 | if (gfc_match_char (',') == MATCH_NO) | |
2246 | break; | |
2247 | } | |
2248 | ||
2249 | if (gfc_match_eos () != MATCH_YES) | |
2250 | goto syntax; | |
2251 | return MATCH_YES; | |
2252 | ||
2253 | syntax: | |
2254 | gfc_syntax_error (st); | |
2255 | ||
2256 | done: | |
2257 | return MATCH_ERROR; | |
2258 | } | |
2259 | ||
2260 | ||
2261 | /* The PRIVATE statement is a bit weird in that it can be a attribute | |
2262 | declaration, but also works as a standlone statement inside of a | |
2263 | type declaration or a module. */ | |
2264 | ||
2265 | match | |
2266 | gfc_match_private (gfc_statement * st) | |
2267 | { | |
2268 | ||
2269 | if (gfc_match ("private") != MATCH_YES) | |
2270 | return MATCH_NO; | |
2271 | ||
2272 | if (gfc_current_state () == COMP_DERIVED) | |
2273 | { | |
2274 | if (gfc_match_eos () == MATCH_YES) | |
2275 | { | |
2276 | *st = ST_PRIVATE; | |
2277 | return MATCH_YES; | |
2278 | } | |
2279 | ||
2280 | gfc_syntax_error (ST_PRIVATE); | |
2281 | return MATCH_ERROR; | |
2282 | } | |
2283 | ||
2284 | if (gfc_match_eos () == MATCH_YES) | |
2285 | { | |
2286 | *st = ST_PRIVATE; | |
2287 | return MATCH_YES; | |
2288 | } | |
2289 | ||
2290 | *st = ST_ATTR_DECL; | |
2291 | return access_attr_decl (ST_PRIVATE); | |
2292 | } | |
2293 | ||
2294 | ||
2295 | match | |
2296 | gfc_match_public (gfc_statement * st) | |
2297 | { | |
2298 | ||
2299 | if (gfc_match ("public") != MATCH_YES) | |
2300 | return MATCH_NO; | |
2301 | ||
2302 | if (gfc_match_eos () == MATCH_YES) | |
2303 | { | |
2304 | *st = ST_PUBLIC; | |
2305 | return MATCH_YES; | |
2306 | } | |
2307 | ||
2308 | *st = ST_ATTR_DECL; | |
2309 | return access_attr_decl (ST_PUBLIC); | |
2310 | } | |
2311 | ||
2312 | ||
2313 | /* Workhorse for gfc_match_parameter. */ | |
2314 | ||
2315 | static match | |
2316 | do_parm (void) | |
2317 | { | |
2318 | gfc_symbol *sym; | |
2319 | gfc_expr *init; | |
2320 | match m; | |
2321 | ||
2322 | m = gfc_match_symbol (&sym, 0); | |
2323 | if (m == MATCH_NO) | |
2324 | gfc_error ("Expected variable name at %C in PARAMETER statement"); | |
2325 | ||
2326 | if (m != MATCH_YES) | |
2327 | return m; | |
2328 | ||
2329 | if (gfc_match_char ('=') == MATCH_NO) | |
2330 | { | |
2331 | gfc_error ("Expected = sign in PARAMETER statement at %C"); | |
2332 | return MATCH_ERROR; | |
2333 | } | |
2334 | ||
2335 | m = gfc_match_init_expr (&init); | |
2336 | if (m == MATCH_NO) | |
2337 | gfc_error ("Expected expression at %C in PARAMETER statement"); | |
2338 | if (m != MATCH_YES) | |
2339 | return m; | |
2340 | ||
2341 | if (sym->ts.type == BT_UNKNOWN | |
2342 | && gfc_set_default_type (sym, 1, NULL) == FAILURE) | |
2343 | { | |
2344 | m = MATCH_ERROR; | |
2345 | goto cleanup; | |
2346 | } | |
2347 | ||
2348 | if (gfc_check_assign_symbol (sym, init) == FAILURE | |
2349 | || gfc_add_flavor (&sym->attr, FL_PARAMETER, NULL) == FAILURE) | |
2350 | { | |
2351 | m = MATCH_ERROR; | |
2352 | goto cleanup; | |
2353 | } | |
2354 | ||
2355 | sym->value = init; | |
2356 | return MATCH_YES; | |
2357 | ||
2358 | cleanup: | |
2359 | gfc_free_expr (init); | |
2360 | return m; | |
2361 | } | |
2362 | ||
2363 | ||
2364 | /* Match a parameter statement, with the weird syntax that these have. */ | |
2365 | ||
2366 | match | |
2367 | gfc_match_parameter (void) | |
2368 | { | |
2369 | match m; | |
2370 | ||
2371 | if (gfc_match_char ('(') == MATCH_NO) | |
2372 | return MATCH_NO; | |
2373 | ||
2374 | for (;;) | |
2375 | { | |
2376 | m = do_parm (); | |
2377 | if (m != MATCH_YES) | |
2378 | break; | |
2379 | ||
2380 | if (gfc_match (" )%t") == MATCH_YES) | |
2381 | break; | |
2382 | ||
2383 | if (gfc_match_char (',') != MATCH_YES) | |
2384 | { | |
2385 | gfc_error ("Unexpected characters in PARAMETER statement at %C"); | |
2386 | m = MATCH_ERROR; | |
2387 | break; | |
2388 | } | |
2389 | } | |
2390 | ||
2391 | return m; | |
2392 | } | |
2393 | ||
2394 | ||
2395 | /* Save statements have a special syntax. */ | |
2396 | ||
2397 | match | |
2398 | gfc_match_save (void) | |
2399 | { | |
2400 | gfc_symbol *sym; | |
2401 | match m; | |
2402 | ||
2403 | if (gfc_match_eos () == MATCH_YES) | |
2404 | { | |
2405 | if (gfc_current_ns->seen_save) | |
2406 | { | |
2407 | gfc_error ("Blanket SAVE statement at %C follows previous " | |
2408 | "SAVE statement"); | |
2409 | ||
2410 | return MATCH_ERROR; | |
2411 | } | |
2412 | ||
2413 | gfc_current_ns->save_all = gfc_current_ns->seen_save = 1; | |
2414 | return MATCH_YES; | |
2415 | } | |
2416 | ||
2417 | if (gfc_current_ns->save_all) | |
2418 | { | |
2419 | gfc_error ("SAVE statement at %C follows blanket SAVE statement"); | |
2420 | return MATCH_ERROR; | |
2421 | } | |
2422 | ||
2423 | gfc_match (" ::"); | |
2424 | ||
2425 | for (;;) | |
2426 | { | |
2427 | m = gfc_match_symbol (&sym, 0); | |
2428 | switch (m) | |
2429 | { | |
2430 | case MATCH_YES: | |
63645982 | 2431 | if (gfc_add_save (&sym->attr, &gfc_current_locus) == FAILURE) |
6de9cd9a DN |
2432 | return MATCH_ERROR; |
2433 | goto next_item; | |
2434 | ||
2435 | case MATCH_NO: | |
2436 | break; | |
2437 | ||
2438 | case MATCH_ERROR: | |
2439 | return MATCH_ERROR; | |
2440 | } | |
2441 | ||
2442 | m = gfc_match (" / %s /", &sym); | |
2443 | if (m == MATCH_ERROR) | |
2444 | return MATCH_ERROR; | |
2445 | if (m == MATCH_NO) | |
2446 | goto syntax; | |
2447 | ||
2448 | if (gfc_add_saved_common (&sym->attr, NULL) == FAILURE) | |
2449 | return MATCH_ERROR; | |
2450 | gfc_current_ns->seen_save = 1; | |
2451 | ||
2452 | next_item: | |
2453 | if (gfc_match_eos () == MATCH_YES) | |
2454 | break; | |
2455 | if (gfc_match_char (',') != MATCH_YES) | |
2456 | goto syntax; | |
2457 | } | |
2458 | ||
2459 | return MATCH_YES; | |
2460 | ||
2461 | syntax: | |
2462 | gfc_error ("Syntax error in SAVE statement at %C"); | |
2463 | return MATCH_ERROR; | |
2464 | } | |
2465 | ||
2466 | ||
2467 | /* Match a module procedure statement. Note that we have to modify | |
2468 | symbols in the parent's namespace because the current one was there | |
2469 | to receive symbols that are in a interface's formal argument list. */ | |
2470 | ||
2471 | match | |
2472 | gfc_match_modproc (void) | |
2473 | { | |
2474 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
2475 | gfc_symbol *sym; | |
2476 | match m; | |
2477 | ||
2478 | if (gfc_state_stack->state != COMP_INTERFACE | |
2479 | || gfc_state_stack->previous == NULL | |
2480 | || current_interface.type == INTERFACE_NAMELESS) | |
2481 | { | |
2482 | gfc_error | |
2483 | ("MODULE PROCEDURE at %C must be in a generic module interface"); | |
2484 | return MATCH_ERROR; | |
2485 | } | |
2486 | ||
2487 | for (;;) | |
2488 | { | |
2489 | m = gfc_match_name (name); | |
2490 | if (m == MATCH_NO) | |
2491 | goto syntax; | |
2492 | if (m != MATCH_YES) | |
2493 | return MATCH_ERROR; | |
2494 | ||
2495 | if (gfc_get_symbol (name, gfc_current_ns->parent, &sym)) | |
2496 | return MATCH_ERROR; | |
2497 | ||
2498 | if (sym->attr.proc != PROC_MODULE | |
2499 | && gfc_add_procedure (&sym->attr, PROC_MODULE, NULL) == FAILURE) | |
2500 | return MATCH_ERROR; | |
2501 | ||
2502 | if (gfc_add_interface (sym) == FAILURE) | |
2503 | return MATCH_ERROR; | |
2504 | ||
2505 | if (gfc_match_eos () == MATCH_YES) | |
2506 | break; | |
2507 | if (gfc_match_char (',') != MATCH_YES) | |
2508 | goto syntax; | |
2509 | } | |
2510 | ||
2511 | return MATCH_YES; | |
2512 | ||
2513 | syntax: | |
2514 | gfc_syntax_error (ST_MODULE_PROC); | |
2515 | return MATCH_ERROR; | |
2516 | } | |
2517 | ||
2518 | ||
2519 | /* Match the beginning of a derived type declaration. If a type name | |
2520 | was the result of a function, then it is possible to have a symbol | |
2521 | already to be known as a derived type yet have no components. */ | |
2522 | ||
2523 | match | |
2524 | gfc_match_derived_decl (void) | |
2525 | { | |
2526 | char name[GFC_MAX_SYMBOL_LEN + 1]; | |
2527 | symbol_attribute attr; | |
2528 | gfc_symbol *sym; | |
2529 | match m; | |
2530 | ||
2531 | if (gfc_current_state () == COMP_DERIVED) | |
2532 | return MATCH_NO; | |
2533 | ||
2534 | gfc_clear_attr (&attr); | |
2535 | ||
2536 | loop: | |
2537 | if (gfc_match (" , private") == MATCH_YES) | |
2538 | { | |
2539 | if (gfc_find_state (COMP_MODULE) == FAILURE) | |
2540 | { | |
2541 | gfc_error | |
2542 | ("Derived type at %C can only be PRIVATE within a MODULE"); | |
2543 | return MATCH_ERROR; | |
2544 | } | |
2545 | ||
2546 | if (gfc_add_access (&attr, ACCESS_PRIVATE, NULL) == FAILURE) | |
2547 | return MATCH_ERROR; | |
2548 | goto loop; | |
2549 | } | |
2550 | ||
2551 | if (gfc_match (" , public") == MATCH_YES) | |
2552 | { | |
2553 | if (gfc_find_state (COMP_MODULE) == FAILURE) | |
2554 | { | |
2555 | gfc_error ("Derived type at %C can only be PUBLIC within a MODULE"); | |
2556 | return MATCH_ERROR; | |
2557 | } | |
2558 | ||
2559 | if (gfc_add_access (&attr, ACCESS_PUBLIC, NULL) == FAILURE) | |
2560 | return MATCH_ERROR; | |
2561 | goto loop; | |
2562 | } | |
2563 | ||
2564 | if (gfc_match (" ::") != MATCH_YES && attr.access != ACCESS_UNKNOWN) | |
2565 | { | |
2566 | gfc_error ("Expected :: in TYPE definition at %C"); | |
2567 | return MATCH_ERROR; | |
2568 | } | |
2569 | ||
2570 | m = gfc_match (" %n%t", name); | |
2571 | if (m != MATCH_YES) | |
2572 | return m; | |
2573 | ||
2574 | /* Make sure the name isn't the name of an intrinsic type. The | |
2575 | 'double precision' type doesn't get past the name matcher. */ | |
2576 | if (strcmp (name, "integer") == 0 | |
2577 | || strcmp (name, "real") == 0 | |
2578 | || strcmp (name, "character") == 0 | |
2579 | || strcmp (name, "logical") == 0 | |
2580 | || strcmp (name, "complex") == 0) | |
2581 | { | |
2582 | gfc_error | |
2583 | ("Type name '%s' at %C cannot be the same as an intrinsic type", | |
2584 | name); | |
2585 | return MATCH_ERROR; | |
2586 | } | |
2587 | ||
2588 | if (gfc_get_symbol (name, NULL, &sym)) | |
2589 | return MATCH_ERROR; | |
2590 | ||
2591 | if (sym->ts.type != BT_UNKNOWN) | |
2592 | { | |
2593 | gfc_error ("Derived type name '%s' at %C already has a basic type " | |
2594 | "of %s", sym->name, gfc_typename (&sym->ts)); | |
2595 | return MATCH_ERROR; | |
2596 | } | |
2597 | ||
2598 | /* The symbol may already have the derived attribute without the | |
2599 | components. The ways this can happen is via a function | |
2600 | definition, an INTRINSIC statement or a subtype in another | |
2601 | derived type that is a pointer. The first part of the AND clause | |
2602 | is true if a the symbol is not the return value of a function. */ | |
2603 | if (sym->attr.flavor != FL_DERIVED | |
2604 | && gfc_add_flavor (&sym->attr, FL_DERIVED, NULL) == FAILURE) | |
2605 | return MATCH_ERROR; | |
2606 | ||
2607 | if (sym->components != NULL) | |
2608 | { | |
2609 | gfc_error | |
2610 | ("Derived type definition of '%s' at %C has already been defined", | |
2611 | sym->name); | |
2612 | return MATCH_ERROR; | |
2613 | } | |
2614 | ||
2615 | if (attr.access != ACCESS_UNKNOWN | |
2616 | && gfc_add_access (&sym->attr, attr.access, NULL) == FAILURE) | |
2617 | return MATCH_ERROR; | |
2618 | ||
2619 | gfc_new_block = sym; | |
2620 | ||
2621 | return MATCH_YES; | |
2622 | } |