1 /* Declaration statement matcher
2 Copyright (C) 2002-2013 Free Software Foundation, Inc.
3 Contributed by Andy Vaught
4
5 This file is part of GCC.
6
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 3, or (at your option) any later
10 version.
11
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.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #include "config.h"
22 #include "system.h"
23 #include "coretypes.h"
24 #include "gfortran.h"
25 #include "match.h"
26 #include "parse.h"
27 #include "flags.h"
28 #include "constructor.h"
29 #include "tree.h"
30
31 /* Macros to access allocate memory for gfc_data_variable,
32 gfc_data_value and gfc_data. */
33 #define gfc_get_data_variable() XCNEW (gfc_data_variable)
34 #define gfc_get_data_value() XCNEW (gfc_data_value)
35 #define gfc_get_data() XCNEW (gfc_data)
36
37
38 static gfc_try set_binding_label (const char **, const char *, int);
39
40
41 /* This flag is set if an old-style length selector is matched
42 during a type-declaration statement. */
43
44 static int old_char_selector;
45
46 /* When variables acquire types and attributes from a declaration
47 statement, they get them from the following static variables. The
48 first part of a declaration sets these variables and the second
49 part copies these into symbol structures. */
50
51 static gfc_typespec current_ts;
52
53 static symbol_attribute current_attr;
54 static gfc_array_spec *current_as;
55 static int colon_seen;
56
57 /* The current binding label (if any). */
58 static const char* curr_binding_label;
59 /* Need to know how many identifiers are on the current data declaration
60 line in case we're given the BIND(C) attribute with a NAME= specifier. */
61 static int num_idents_on_line;
62 /* Need to know if a NAME= specifier was found during gfc_match_bind_c so we
63 can supply a name if the curr_binding_label is nil and NAME= was not. */
64 static int has_name_equals = 0;
65
66 /* Initializer of the previous enumerator. */
67
68 static gfc_expr *last_initializer;
69
70 /* History of all the enumerators is maintained, so that
71 kind values of all the enumerators could be updated depending
72 upon the maximum initialized value. */
73
74 typedef struct enumerator_history
75 {
76 gfc_symbol *sym;
77 gfc_expr *initializer;
78 struct enumerator_history *next;
79 }
80 enumerator_history;
81
82 /* Header of enum history chain. */
83
84 static enumerator_history *enum_history = NULL;
85
86 /* Pointer of enum history node containing largest initializer. */
87
88 static enumerator_history *max_enum = NULL;
89
90 /* gfc_new_block points to the symbol of a newly matched block. */
91
92 gfc_symbol *gfc_new_block;
93
94 bool gfc_matching_function;
95
96
97 /********************* DATA statement subroutines *********************/
98
99 static bool in_match_data = false;
100
101 bool
gfc_in_match_data(void)102 gfc_in_match_data (void)
103 {
104 return in_match_data;
105 }
106
107 static void
set_in_match_data(bool set_value)108 set_in_match_data (bool set_value)
109 {
110 in_match_data = set_value;
111 }
112
113 /* Free a gfc_data_variable structure and everything beneath it. */
114
115 static void
free_variable(gfc_data_variable * p)116 free_variable (gfc_data_variable *p)
117 {
118 gfc_data_variable *q;
119
120 for (; p; p = q)
121 {
122 q = p->next;
123 gfc_free_expr (p->expr);
124 gfc_free_iterator (&p->iter, 0);
125 free_variable (p->list);
126 free (p);
127 }
128 }
129
130
131 /* Free a gfc_data_value structure and everything beneath it. */
132
133 static void
free_value(gfc_data_value * p)134 free_value (gfc_data_value *p)
135 {
136 gfc_data_value *q;
137
138 for (; p; p = q)
139 {
140 q = p->next;
141 mpz_clear (p->repeat);
142 gfc_free_expr (p->expr);
143 free (p);
144 }
145 }
146
147
148 /* Free a list of gfc_data structures. */
149
150 void
gfc_free_data(gfc_data * p)151 gfc_free_data (gfc_data *p)
152 {
153 gfc_data *q;
154
155 for (; p; p = q)
156 {
157 q = p->next;
158 free_variable (p->var);
159 free_value (p->value);
160 free (p);
161 }
162 }
163
164
165 /* Free all data in a namespace. */
166
167 static void
gfc_free_data_all(gfc_namespace * ns)168 gfc_free_data_all (gfc_namespace *ns)
169 {
170 gfc_data *d;
171
172 for (;ns->data;)
173 {
174 d = ns->data->next;
175 free (ns->data);
176 ns->data = d;
177 }
178 }
179
180
181 static match var_element (gfc_data_variable *);
182
183 /* Match a list of variables terminated by an iterator and a right
184 parenthesis. */
185
186 static match
var_list(gfc_data_variable * parent)187 var_list (gfc_data_variable *parent)
188 {
189 gfc_data_variable *tail, var;
190 match m;
191
192 m = var_element (&var);
193 if (m == MATCH_ERROR)
194 return MATCH_ERROR;
195 if (m == MATCH_NO)
196 goto syntax;
197
198 tail = gfc_get_data_variable ();
199 *tail = var;
200
201 parent->list = tail;
202
203 for (;;)
204 {
205 if (gfc_match_char (',') != MATCH_YES)
206 goto syntax;
207
208 m = gfc_match_iterator (&parent->iter, 1);
209 if (m == MATCH_YES)
210 break;
211 if (m == MATCH_ERROR)
212 return MATCH_ERROR;
213
214 m = var_element (&var);
215 if (m == MATCH_ERROR)
216 return MATCH_ERROR;
217 if (m == MATCH_NO)
218 goto syntax;
219
220 tail->next = gfc_get_data_variable ();
221 tail = tail->next;
222
223 *tail = var;
224 }
225
226 if (gfc_match_char (')') != MATCH_YES)
227 goto syntax;
228 return MATCH_YES;
229
230 syntax:
231 gfc_syntax_error (ST_DATA);
232 return MATCH_ERROR;
233 }
234
235
236 /* Match a single element in a data variable list, which can be a
237 variable-iterator list. */
238
239 static match
var_element(gfc_data_variable * new_var)240 var_element (gfc_data_variable *new_var)
241 {
242 match m;
243 gfc_symbol *sym;
244
245 memset (new_var, 0, sizeof (gfc_data_variable));
246
247 if (gfc_match_char ('(') == MATCH_YES)
248 return var_list (new_var);
249
250 m = gfc_match_variable (&new_var->expr, 0);
251 if (m != MATCH_YES)
252 return m;
253
254 sym = new_var->expr->symtree->n.sym;
255
256 /* Symbol should already have an associated type. */
257 if (gfc_check_symbol_typed (sym, gfc_current_ns,
258 false, gfc_current_locus) == FAILURE)
259 return MATCH_ERROR;
260
261 if (!sym->attr.function && gfc_current_ns->parent
262 && gfc_current_ns->parent == sym->ns)
263 {
264 gfc_error ("Host associated variable '%s' may not be in the DATA "
265 "statement at %C", sym->name);
266 return MATCH_ERROR;
267 }
268
269 if (gfc_current_state () != COMP_BLOCK_DATA
270 && sym->attr.in_common
271 && gfc_notify_std (GFC_STD_GNU, "initialization of "
272 "common block variable '%s' in DATA statement at %C",
273 sym->name) == FAILURE)
274 return MATCH_ERROR;
275
276 if (gfc_add_data (&sym->attr, sym->name, &new_var->expr->where) == FAILURE)
277 return MATCH_ERROR;
278
279 return MATCH_YES;
280 }
281
282
283 /* Match the top-level list of data variables. */
284
285 static match
top_var_list(gfc_data * d)286 top_var_list (gfc_data *d)
287 {
288 gfc_data_variable var, *tail, *new_var;
289 match m;
290
291 tail = NULL;
292
293 for (;;)
294 {
295 m = var_element (&var);
296 if (m == MATCH_NO)
297 goto syntax;
298 if (m == MATCH_ERROR)
299 return MATCH_ERROR;
300
301 new_var = gfc_get_data_variable ();
302 *new_var = var;
303
304 if (tail == NULL)
305 d->var = new_var;
306 else
307 tail->next = new_var;
308
309 tail = new_var;
310
311 if (gfc_match_char ('/') == MATCH_YES)
312 break;
313 if (gfc_match_char (',') != MATCH_YES)
314 goto syntax;
315 }
316
317 return MATCH_YES;
318
319 syntax:
320 gfc_syntax_error (ST_DATA);
321 gfc_free_data_all (gfc_current_ns);
322 return MATCH_ERROR;
323 }
324
325
326 static match
match_data_constant(gfc_expr ** result)327 match_data_constant (gfc_expr **result)
328 {
329 char name[GFC_MAX_SYMBOL_LEN + 1];
330 gfc_symbol *sym, *dt_sym = NULL;
331 gfc_expr *expr;
332 match m;
333 locus old_loc;
334
335 m = gfc_match_literal_constant (&expr, 1);
336 if (m == MATCH_YES)
337 {
338 *result = expr;
339 return MATCH_YES;
340 }
341
342 if (m == MATCH_ERROR)
343 return MATCH_ERROR;
344
345 m = gfc_match_null (result);
346 if (m != MATCH_NO)
347 return m;
348
349 old_loc = gfc_current_locus;
350
351 /* Should this be a structure component, try to match it
352 before matching a name. */
353 m = gfc_match_rvalue (result);
354 if (m == MATCH_ERROR)
355 return m;
356
357 if (m == MATCH_YES && (*result)->expr_type == EXPR_STRUCTURE)
358 {
359 if (gfc_simplify_expr (*result, 0) == FAILURE)
360 m = MATCH_ERROR;
361 return m;
362 }
363 else if (m == MATCH_YES)
364 gfc_free_expr (*result);
365
366 gfc_current_locus = old_loc;
367
368 m = gfc_match_name (name);
369 if (m != MATCH_YES)
370 return m;
371
372 if (gfc_find_symbol (name, NULL, 1, &sym))
373 return MATCH_ERROR;
374
375 if (sym && sym->attr.generic)
376 dt_sym = gfc_find_dt_in_generic (sym);
377
378 if (sym == NULL
379 || (sym->attr.flavor != FL_PARAMETER
380 && (!dt_sym || dt_sym->attr.flavor != FL_DERIVED)))
381 {
382 gfc_error ("Symbol '%s' must be a PARAMETER in DATA statement at %C",
383 name);
384 return MATCH_ERROR;
385 }
386 else if (dt_sym && dt_sym->attr.flavor == FL_DERIVED)
387 return gfc_match_structure_constructor (dt_sym, result);
388
389 /* Check to see if the value is an initialization array expression. */
390 if (sym->value->expr_type == EXPR_ARRAY)
391 {
392 gfc_current_locus = old_loc;
393
394 m = gfc_match_init_expr (result);
395 if (m == MATCH_ERROR)
396 return m;
397
398 if (m == MATCH_YES)
399 {
400 if (gfc_simplify_expr (*result, 0) == FAILURE)
401 m = MATCH_ERROR;
402
403 if ((*result)->expr_type == EXPR_CONSTANT)
404 return m;
405 else
406 {
407 gfc_error ("Invalid initializer %s in Data statement at %C", name);
408 return MATCH_ERROR;
409 }
410 }
411 }
412
413 *result = gfc_copy_expr (sym->value);
414 return MATCH_YES;
415 }
416
417
418 /* Match a list of values in a DATA statement. The leading '/' has
419 already been seen at this point. */
420
421 static match
top_val_list(gfc_data * data)422 top_val_list (gfc_data *data)
423 {
424 gfc_data_value *new_val, *tail;
425 gfc_expr *expr;
426 match m;
427
428 tail = NULL;
429
430 for (;;)
431 {
432 m = match_data_constant (&expr);
433 if (m == MATCH_NO)
434 goto syntax;
435 if (m == MATCH_ERROR)
436 return MATCH_ERROR;
437
438 new_val = gfc_get_data_value ();
439 mpz_init (new_val->repeat);
440
441 if (tail == NULL)
442 data->value = new_val;
443 else
444 tail->next = new_val;
445
446 tail = new_val;
447
448 if (expr->ts.type != BT_INTEGER || gfc_match_char ('*') != MATCH_YES)
449 {
450 tail->expr = expr;
451 mpz_set_ui (tail->repeat, 1);
452 }
453 else
454 {
455 mpz_set (tail->repeat, expr->value.integer);
456 gfc_free_expr (expr);
457
458 m = match_data_constant (&tail->expr);
459 if (m == MATCH_NO)
460 goto syntax;
461 if (m == MATCH_ERROR)
462 return MATCH_ERROR;
463 }
464
465 if (gfc_match_char ('/') == MATCH_YES)
466 break;
467 if (gfc_match_char (',') == MATCH_NO)
468 goto syntax;
469 }
470
471 return MATCH_YES;
472
473 syntax:
474 gfc_syntax_error (ST_DATA);
475 gfc_free_data_all (gfc_current_ns);
476 return MATCH_ERROR;
477 }
478
479
480 /* Matches an old style initialization. */
481
482 static match
match_old_style_init(const char * name)483 match_old_style_init (const char *name)
484 {
485 match m;
486 gfc_symtree *st;
487 gfc_symbol *sym;
488 gfc_data *newdata;
489
490 /* Set up data structure to hold initializers. */
491 gfc_find_sym_tree (name, NULL, 0, &st);
492 sym = st->n.sym;
493
494 newdata = gfc_get_data ();
495 newdata->var = gfc_get_data_variable ();
496 newdata->var->expr = gfc_get_variable_expr (st);
497 newdata->where = gfc_current_locus;
498
499 /* Match initial value list. This also eats the terminal '/'. */
500 m = top_val_list (newdata);
501 if (m != MATCH_YES)
502 {
503 free (newdata);
504 return m;
505 }
506
507 if (gfc_pure (NULL))
508 {
509 gfc_error ("Initialization at %C is not allowed in a PURE procedure");
510 free (newdata);
511 return MATCH_ERROR;
512 }
513
514 if (gfc_implicit_pure (NULL))
515 gfc_current_ns->proc_name->attr.implicit_pure = 0;
516
517 /* Mark the variable as having appeared in a data statement. */
518 if (gfc_add_data (&sym->attr, sym->name, &sym->declared_at) == FAILURE)
519 {
520 free (newdata);
521 return MATCH_ERROR;
522 }
523
524 /* Chain in namespace list of DATA initializers. */
525 newdata->next = gfc_current_ns->data;
526 gfc_current_ns->data = newdata;
527
528 return m;
529 }
530
531
532 /* Match the stuff following a DATA statement. If ERROR_FLAG is set,
533 we are matching a DATA statement and are therefore issuing an error
534 if we encounter something unexpected, if not, we're trying to match
535 an old-style initialization expression of the form INTEGER I /2/. */
536
537 match
gfc_match_data(void)538 gfc_match_data (void)
539 {
540 gfc_data *new_data;
541 match m;
542
543 set_in_match_data (true);
544
545 for (;;)
546 {
547 new_data = gfc_get_data ();
548 new_data->where = gfc_current_locus;
549
550 m = top_var_list (new_data);
551 if (m != MATCH_YES)
552 goto cleanup;
553
554 m = top_val_list (new_data);
555 if (m != MATCH_YES)
556 goto cleanup;
557
558 new_data->next = gfc_current_ns->data;
559 gfc_current_ns->data = new_data;
560
561 if (gfc_match_eos () == MATCH_YES)
562 break;
563
564 gfc_match_char (','); /* Optional comma */
565 }
566
567 set_in_match_data (false);
568
569 if (gfc_pure (NULL))
570 {
571 gfc_error ("DATA statement at %C is not allowed in a PURE procedure");
572 return MATCH_ERROR;
573 }
574
575 if (gfc_implicit_pure (NULL))
576 gfc_current_ns->proc_name->attr.implicit_pure = 0;
577
578 return MATCH_YES;
579
580 cleanup:
581 set_in_match_data (false);
582 gfc_free_data (new_data);
583 return MATCH_ERROR;
584 }
585
586
587 /************************ Declaration statements *********************/
588
589
590 /* Auxiliary function to merge DIMENSION and CODIMENSION array specs. */
591
592 static gfc_try
merge_array_spec(gfc_array_spec * from,gfc_array_spec * to,bool copy)593 merge_array_spec (gfc_array_spec *from, gfc_array_spec *to, bool copy)
594 {
595 int i;
596
597 if ((from->type == AS_ASSUMED_RANK && to->corank)
598 || (to->type == AS_ASSUMED_RANK && from->corank))
599 {
600 gfc_error ("The assumed-rank array at %C shall not have a codimension");
601 return FAILURE;
602 }
603
604 if (to->rank == 0 && from->rank > 0)
605 {
606 to->rank = from->rank;
607 to->type = from->type;
608 to->cray_pointee = from->cray_pointee;
609 to->cp_was_assumed = from->cp_was_assumed;
610
611 for (i = 0; i < to->corank; i++)
612 {
613 to->lower[from->rank + i] = to->lower[i];
614 to->upper[from->rank + i] = to->upper[i];
615 }
616 for (i = 0; i < from->rank; i++)
617 {
618 if (copy)
619 {
620 to->lower[i] = gfc_copy_expr (from->lower[i]);
621 to->upper[i] = gfc_copy_expr (from->upper[i]);
622 }
623 else
624 {
625 to->lower[i] = from->lower[i];
626 to->upper[i] = from->upper[i];
627 }
628 }
629 }
630 else if (to->corank == 0 && from->corank > 0)
631 {
632 to->corank = from->corank;
633 to->cotype = from->cotype;
634
635 for (i = 0; i < from->corank; i++)
636 {
637 if (copy)
638 {
639 to->lower[to->rank + i] = gfc_copy_expr (from->lower[i]);
640 to->upper[to->rank + i] = gfc_copy_expr (from->upper[i]);
641 }
642 else
643 {
644 to->lower[to->rank + i] = from->lower[i];
645 to->upper[to->rank + i] = from->upper[i];
646 }
647 }
648 }
649
650 return SUCCESS;
651 }
652
653
654 /* Match an intent specification. Since this can only happen after an
655 INTENT word, a legal intent-spec must follow. */
656
657 static sym_intent
match_intent_spec(void)658 match_intent_spec (void)
659 {
660
661 if (gfc_match (" ( in out )") == MATCH_YES)
662 return INTENT_INOUT;
663 if (gfc_match (" ( in )") == MATCH_YES)
664 return INTENT_IN;
665 if (gfc_match (" ( out )") == MATCH_YES)
666 return INTENT_OUT;
667
668 gfc_error ("Bad INTENT specification at %C");
669 return INTENT_UNKNOWN;
670 }
671
672
673 /* Matches a character length specification, which is either a
674 specification expression, '*', or ':'. */
675
676 static match
char_len_param_value(gfc_expr ** expr,bool * deferred)677 char_len_param_value (gfc_expr **expr, bool *deferred)
678 {
679 match m;
680
681 *expr = NULL;
682 *deferred = false;
683
684 if (gfc_match_char ('*') == MATCH_YES)
685 return MATCH_YES;
686
687 if (gfc_match_char (':') == MATCH_YES)
688 {
689 if (gfc_notify_std (GFC_STD_F2003, "deferred type "
690 "parameter at %C") == FAILURE)
691 return MATCH_ERROR;
692
693 *deferred = true;
694
695 return MATCH_YES;
696 }
697
698 m = gfc_match_expr (expr);
699
700 if (m == MATCH_YES
701 && gfc_expr_check_typed (*expr, gfc_current_ns, false) == FAILURE)
702 return MATCH_ERROR;
703
704 if (m == MATCH_YES && (*expr)->expr_type == EXPR_FUNCTION)
705 {
706 if ((*expr)->value.function.actual
707 && (*expr)->value.function.actual->expr->symtree)
708 {
709 gfc_expr *e;
710 e = (*expr)->value.function.actual->expr;
711 if (e->symtree->n.sym->attr.flavor == FL_PROCEDURE
712 && e->expr_type == EXPR_VARIABLE)
713 {
714 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
715 goto syntax;
716 if (e->symtree->n.sym->ts.type == BT_CHARACTER
717 && e->symtree->n.sym->ts.u.cl
718 && e->symtree->n.sym->ts.u.cl->length->ts.type == BT_UNKNOWN)
719 goto syntax;
720 }
721 }
722 }
723 return m;
724
725 syntax:
726 gfc_error ("Conflict in attributes of function argument at %C");
727 return MATCH_ERROR;
728 }
729
730
731 /* A character length is a '*' followed by a literal integer or a
732 char_len_param_value in parenthesis. */
733
734 static match
match_char_length(gfc_expr ** expr,bool * deferred,bool obsolescent_check)735 match_char_length (gfc_expr **expr, bool *deferred, bool obsolescent_check)
736 {
737 int length;
738 match m;
739
740 *deferred = false;
741 m = gfc_match_char ('*');
742 if (m != MATCH_YES)
743 return m;
744
745 m = gfc_match_small_literal_int (&length, NULL);
746 if (m == MATCH_ERROR)
747 return m;
748
749 if (m == MATCH_YES)
750 {
751 if (obsolescent_check
752 && gfc_notify_std (GFC_STD_F95_OBS,
753 "Old-style character length at %C") == FAILURE)
754 return MATCH_ERROR;
755 *expr = gfc_get_int_expr (gfc_default_integer_kind, NULL, length);
756 return m;
757 }
758
759 if (gfc_match_char ('(') == MATCH_NO)
760 goto syntax;
761
762 m = char_len_param_value (expr, deferred);
763 if (m != MATCH_YES && gfc_matching_function)
764 {
765 gfc_undo_symbols ();
766 m = MATCH_YES;
767 }
768
769 if (m == MATCH_ERROR)
770 return m;
771 if (m == MATCH_NO)
772 goto syntax;
773
774 if (gfc_match_char (')') == MATCH_NO)
775 {
776 gfc_free_expr (*expr);
777 *expr = NULL;
778 goto syntax;
779 }
780
781 return MATCH_YES;
782
783 syntax:
784 gfc_error ("Syntax error in character length specification at %C");
785 return MATCH_ERROR;
786 }
787
788
789 /* Special subroutine for finding a symbol. Check if the name is found
790 in the current name space. If not, and we're compiling a function or
791 subroutine and the parent compilation unit is an interface, then check
792 to see if the name we've been given is the name of the interface
793 (located in another namespace). */
794
795 static int
find_special(const char * name,gfc_symbol ** result,bool allow_subroutine)796 find_special (const char *name, gfc_symbol **result, bool allow_subroutine)
797 {
798 gfc_state_data *s;
799 gfc_symtree *st;
800 int i;
801
802 i = gfc_get_sym_tree (name, NULL, &st, allow_subroutine);
803 if (i == 0)
804 {
805 *result = st ? st->n.sym : NULL;
806 goto end;
807 }
808
809 if (gfc_current_state () != COMP_SUBROUTINE
810 && gfc_current_state () != COMP_FUNCTION)
811 goto end;
812
813 s = gfc_state_stack->previous;
814 if (s == NULL)
815 goto end;
816
817 if (s->state != COMP_INTERFACE)
818 goto end;
819 if (s->sym == NULL)
820 goto end; /* Nameless interface. */
821
822 if (strcmp (name, s->sym->name) == 0)
823 {
824 *result = s->sym;
825 return 0;
826 }
827
828 end:
829 return i;
830 }
831
832
833 /* Special subroutine for getting a symbol node associated with a
834 procedure name, used in SUBROUTINE and FUNCTION statements. The
835 symbol is created in the parent using with symtree node in the
836 child unit pointing to the symbol. If the current namespace has no
837 parent, then the symbol is just created in the current unit. */
838
839 static int
get_proc_name(const char * name,gfc_symbol ** result,bool module_fcn_entry)840 get_proc_name (const char *name, gfc_symbol **result, bool module_fcn_entry)
841 {
842 gfc_symtree *st;
843 gfc_symbol *sym;
844 int rc = 0;
845
846 /* Module functions have to be left in their own namespace because
847 they have potentially (almost certainly!) already been referenced.
848 In this sense, they are rather like external functions. This is
849 fixed up in resolve.c(resolve_entries), where the symbol name-
850 space is set to point to the master function, so that the fake
851 result mechanism can work. */
852 if (module_fcn_entry)
853 {
854 /* Present if entry is declared to be a module procedure. */
855 rc = gfc_find_symbol (name, gfc_current_ns->parent, 0, result);
856
857 if (*result == NULL)
858 rc = gfc_get_symbol (name, NULL, result);
859 else if (!gfc_get_symbol (name, NULL, &sym) && sym
860 && (*result)->ts.type == BT_UNKNOWN
861 && sym->attr.flavor == FL_UNKNOWN)
862 /* Pick up the typespec for the entry, if declared in the function
863 body. Note that this symbol is FL_UNKNOWN because it will
864 only have appeared in a type declaration. The local symtree
865 is set to point to the module symbol and a unique symtree
866 to the local version. This latter ensures a correct clearing
867 of the symbols. */
868 {
869 /* If the ENTRY proceeds its specification, we need to ensure
870 that this does not raise a "has no IMPLICIT type" error. */
871 if (sym->ts.type == BT_UNKNOWN)
872 sym->attr.untyped = 1;
873
874 (*result)->ts = sym->ts;
875
876 /* Put the symbol in the procedure namespace so that, should
877 the ENTRY precede its specification, the specification
878 can be applied. */
879 (*result)->ns = gfc_current_ns;
880
881 gfc_find_sym_tree (name, gfc_current_ns, 0, &st);
882 st->n.sym = *result;
883 st = gfc_get_unique_symtree (gfc_current_ns);
884 st->n.sym = sym;
885 }
886 }
887 else
888 rc = gfc_get_symbol (name, gfc_current_ns->parent, result);
889
890 if (rc)
891 return rc;
892
893 sym = *result;
894
895 if (sym && !sym->gfc_new && gfc_current_state () != COMP_INTERFACE)
896 {
897 /* Trap another encompassed procedure with the same name. All
898 these conditions are necessary to avoid picking up an entry
899 whose name clashes with that of the encompassing procedure;
900 this is handled using gsymbols to register unique,globally
901 accessible names. */
902 if (sym->attr.flavor != 0
903 && sym->attr.proc != 0
904 && (sym->attr.subroutine || sym->attr.function)
905 && sym->attr.if_source != IFSRC_UNKNOWN)
906 gfc_error_now ("Procedure '%s' at %C is already defined at %L",
907 name, &sym->declared_at);
908
909 /* Trap a procedure with a name the same as interface in the
910 encompassing scope. */
911 if (sym->attr.generic != 0
912 && (sym->attr.subroutine || sym->attr.function)
913 && !sym->attr.mod_proc)
914 gfc_error_now ("Name '%s' at %C is already defined"
915 " as a generic interface at %L",
916 name, &sym->declared_at);
917
918 /* Trap declarations of attributes in encompassing scope. The
919 signature for this is that ts.kind is set. Legitimate
920 references only set ts.type. */
921 if (sym->ts.kind != 0
922 && !sym->attr.implicit_type
923 && sym->attr.proc == 0
924 && gfc_current_ns->parent != NULL
925 && sym->attr.access == 0
926 && !module_fcn_entry)
927 gfc_error_now ("Procedure '%s' at %C has an explicit interface "
928 "and must not have attributes declared at %L",
929 name, &sym->declared_at);
930 }
931
932 if (gfc_current_ns->parent == NULL || *result == NULL)
933 return rc;
934
935 /* Module function entries will already have a symtree in
936 the current namespace but will need one at module level. */
937 if (module_fcn_entry)
938 {
939 /* Present if entry is declared to be a module procedure. */
940 rc = gfc_find_sym_tree (name, gfc_current_ns->parent, 0, &st);
941 if (st == NULL)
942 st = gfc_new_symtree (&gfc_current_ns->parent->sym_root, name);
943 }
944 else
945 st = gfc_new_symtree (&gfc_current_ns->sym_root, name);
946
947 st->n.sym = sym;
948 sym->refs++;
949
950 /* See if the procedure should be a module procedure. */
951
952 if (((sym->ns->proc_name != NULL
953 && sym->ns->proc_name->attr.flavor == FL_MODULE
954 && sym->attr.proc != PROC_MODULE)
955 || (module_fcn_entry && sym->attr.proc != PROC_MODULE))
956 && gfc_add_procedure (&sym->attr, PROC_MODULE,
957 sym->name, NULL) == FAILURE)
958 rc = 2;
959
960 return rc;
961 }
962
963
964 /* Verify that the given symbol representing a parameter is C
965 interoperable, by checking to see if it was marked as such after
966 its declaration. If the given symbol is not interoperable, a
967 warning is reported, thus removing the need to return the status to
968 the calling function. The standard does not require the user use
969 one of the iso_c_binding named constants to declare an
970 interoperable parameter, but we can't be sure if the param is C
971 interop or not if the user doesn't. For example, integer(4) may be
972 legal Fortran, but doesn't have meaning in C. It may interop with
973 a number of the C types, which causes a problem because the
974 compiler can't know which one. This code is almost certainly not
975 portable, and the user will get what they deserve if the C type
976 across platforms isn't always interoperable with integer(4). If
977 the user had used something like integer(c_int) or integer(c_long),
978 the compiler could have automatically handled the varying sizes
979 across platforms. */
980
981 gfc_try
gfc_verify_c_interop_param(gfc_symbol * sym)982 gfc_verify_c_interop_param (gfc_symbol *sym)
983 {
984 int is_c_interop = 0;
985 gfc_try retval = SUCCESS;
986
987 /* We check implicitly typed variables in symbol.c:gfc_set_default_type().
988 Don't repeat the checks here. */
989 if (sym->attr.implicit_type)
990 return SUCCESS;
991
992 /* For subroutines or functions that are passed to a BIND(C) procedure,
993 they're interoperable if they're BIND(C) and their params are all
994 interoperable. */
995 if (sym->attr.flavor == FL_PROCEDURE)
996 {
997 if (sym->attr.is_bind_c == 0)
998 {
999 gfc_error_now ("Procedure '%s' at %L must have the BIND(C) "
1000 "attribute to be C interoperable", sym->name,
1001 &(sym->declared_at));
1002
1003 return FAILURE;
1004 }
1005 else
1006 {
1007 if (sym->attr.is_c_interop == 1)
1008 /* We've already checked this procedure; don't check it again. */
1009 return SUCCESS;
1010 else
1011 return verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
1012 sym->common_block);
1013 }
1014 }
1015
1016 /* See if we've stored a reference to a procedure that owns sym. */
1017 if (sym->ns != NULL && sym->ns->proc_name != NULL)
1018 {
1019 if (sym->ns->proc_name->attr.is_bind_c == 1)
1020 {
1021 is_c_interop = (gfc_verify_c_interop (&(sym->ts)) == SUCCESS ? 1 : 0);
1022
1023 if (is_c_interop != 1)
1024 {
1025 /* Make personalized messages to give better feedback. */
1026 if (sym->ts.type == BT_DERIVED)
1027 gfc_error ("Variable '%s' at %L is a dummy argument to the "
1028 "BIND(C) procedure '%s' but is not C interoperable "
1029 "because derived type '%s' is not C interoperable",
1030 sym->name, &(sym->declared_at),
1031 sym->ns->proc_name->name,
1032 sym->ts.u.derived->name);
1033 else if (sym->ts.type == BT_CLASS)
1034 gfc_error ("Variable '%s' at %L is a dummy argument to the "
1035 "BIND(C) procedure '%s' but is not C interoperable "
1036 "because it is polymorphic",
1037 sym->name, &(sym->declared_at),
1038 sym->ns->proc_name->name);
1039 else if (gfc_option.warn_c_binding_type)
1040 gfc_warning ("Variable '%s' at %L is a dummy argument of the "
1041 "BIND(C) procedure '%s' but may not be C "
1042 "interoperable",
1043 sym->name, &(sym->declared_at),
1044 sym->ns->proc_name->name);
1045 }
1046
1047 /* Character strings are only C interoperable if they have a
1048 length of 1. */
1049 if (sym->ts.type == BT_CHARACTER)
1050 {
1051 gfc_charlen *cl = sym->ts.u.cl;
1052 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT
1053 || mpz_cmp_si (cl->length->value.integer, 1) != 0)
1054 {
1055 gfc_error ("Character argument '%s' at %L "
1056 "must be length 1 because "
1057 "procedure '%s' is BIND(C)",
1058 sym->name, &sym->declared_at,
1059 sym->ns->proc_name->name);
1060 retval = FAILURE;
1061 }
1062 }
1063
1064 /* We have to make sure that any param to a bind(c) routine does
1065 not have the allocatable, pointer, or optional attributes,
1066 according to J3/04-007, section 5.1. */
1067 if (sym->attr.allocatable == 1)
1068 {
1069 gfc_error ("Variable '%s' at %L cannot have the "
1070 "ALLOCATABLE attribute because procedure '%s'"
1071 " is BIND(C)", sym->name, &(sym->declared_at),
1072 sym->ns->proc_name->name);
1073 retval = FAILURE;
1074 }
1075
1076 if (sym->attr.pointer == 1)
1077 {
1078 gfc_error ("Variable '%s' at %L cannot have the "
1079 "POINTER attribute because procedure '%s'"
1080 " is BIND(C)", sym->name, &(sym->declared_at),
1081 sym->ns->proc_name->name);
1082 retval = FAILURE;
1083 }
1084
1085 if (sym->attr.optional == 1 && sym->attr.value)
1086 {
1087 gfc_error ("Variable '%s' at %L cannot have both the OPTIONAL "
1088 "and the VALUE attribute because procedure '%s' "
1089 "is BIND(C)", sym->name, &(sym->declared_at),
1090 sym->ns->proc_name->name);
1091 retval = FAILURE;
1092 }
1093 else if (sym->attr.optional == 1
1094 && gfc_notify_std (GFC_STD_F2008_TS, "Variable '%s' "
1095 "at %L with OPTIONAL attribute in "
1096 "procedure '%s' which is BIND(C)",
1097 sym->name, &(sym->declared_at),
1098 sym->ns->proc_name->name)
1099 == FAILURE)
1100 retval = FAILURE;
1101
1102 /* Make sure that if it has the dimension attribute, that it is
1103 either assumed size or explicit shape. Deferred shape is already
1104 covered by the pointer/allocatable attribute. */
1105 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SHAPE
1106 && gfc_notify_std (GFC_STD_F2008_TS, "Assumed-shape array '%s' "
1107 "at %L as dummy argument to the BIND(C) "
1108 "procedure '%s' at %L", sym->name,
1109 &(sym->declared_at), sym->ns->proc_name->name,
1110 &(sym->ns->proc_name->declared_at)) == FAILURE)
1111 retval = FAILURE;
1112 }
1113 }
1114
1115 return retval;
1116 }
1117
1118
1119
1120 /* Function called by variable_decl() that adds a name to the symbol table. */
1121
1122 static gfc_try
build_sym(const char * name,gfc_charlen * cl,bool cl_deferred,gfc_array_spec ** as,locus * var_locus)1123 build_sym (const char *name, gfc_charlen *cl, bool cl_deferred,
1124 gfc_array_spec **as, locus *var_locus)
1125 {
1126 symbol_attribute attr;
1127 gfc_symbol *sym;
1128
1129 if (gfc_get_symbol (name, NULL, &sym))
1130 return FAILURE;
1131
1132 /* Start updating the symbol table. Add basic type attribute if present. */
1133 if (current_ts.type != BT_UNKNOWN
1134 && (sym->attr.implicit_type == 0
1135 || !gfc_compare_types (&sym->ts, ¤t_ts))
1136 && gfc_add_type (sym, ¤t_ts, var_locus) == FAILURE)
1137 return FAILURE;
1138
1139 if (sym->ts.type == BT_CHARACTER)
1140 {
1141 sym->ts.u.cl = cl;
1142 sym->ts.deferred = cl_deferred;
1143 }
1144
1145 /* Add dimension attribute if present. */
1146 if (gfc_set_array_spec (sym, *as, var_locus) == FAILURE)
1147 return FAILURE;
1148 *as = NULL;
1149
1150 /* Add attribute to symbol. The copy is so that we can reset the
1151 dimension attribute. */
1152 attr = current_attr;
1153 attr.dimension = 0;
1154 attr.codimension = 0;
1155
1156 if (gfc_copy_attr (&sym->attr, &attr, var_locus) == FAILURE)
1157 return FAILURE;
1158
1159 /* Finish any work that may need to be done for the binding label,
1160 if it's a bind(c). The bind(c) attr is found before the symbol
1161 is made, and before the symbol name (for data decls), so the
1162 current_ts is holding the binding label, or nothing if the
1163 name= attr wasn't given. Therefore, test here if we're dealing
1164 with a bind(c) and make sure the binding label is set correctly. */
1165 if (sym->attr.is_bind_c == 1)
1166 {
1167 if (!sym->binding_label)
1168 {
1169 /* Set the binding label and verify that if a NAME= was specified
1170 then only one identifier was in the entity-decl-list. */
1171 if (set_binding_label (&sym->binding_label, sym->name,
1172 num_idents_on_line) == FAILURE)
1173 return FAILURE;
1174 }
1175 }
1176
1177 /* See if we know we're in a common block, and if it's a bind(c)
1178 common then we need to make sure we're an interoperable type. */
1179 if (sym->attr.in_common == 1)
1180 {
1181 /* Test the common block object. */
1182 if (sym->common_block != NULL && sym->common_block->is_bind_c == 1
1183 && sym->ts.is_c_interop != 1)
1184 {
1185 gfc_error_now ("Variable '%s' in common block '%s' at %C "
1186 "must be declared with a C interoperable "
1187 "kind since common block '%s' is BIND(C)",
1188 sym->name, sym->common_block->name,
1189 sym->common_block->name);
1190 gfc_clear_error ();
1191 }
1192 }
1193
1194 sym->attr.implied_index = 0;
1195
1196 if (sym->ts.type == BT_CLASS)
1197 return gfc_build_class_symbol (&sym->ts, &sym->attr, &sym->as, false);
1198
1199 return SUCCESS;
1200 }
1201
1202
1203 /* Set character constant to the given length. The constant will be padded or
1204 truncated. If we're inside an array constructor without a typespec, we
1205 additionally check that all elements have the same length; check_len -1
1206 means no checking. */
1207
1208 void
gfc_set_constant_character_len(int len,gfc_expr * expr,int check_len)1209 gfc_set_constant_character_len (int len, gfc_expr *expr, int check_len)
1210 {
1211 gfc_char_t *s;
1212 int slen;
1213
1214 gcc_assert (expr->expr_type == EXPR_CONSTANT);
1215 gcc_assert (expr->ts.type == BT_CHARACTER);
1216
1217 slen = expr->value.character.length;
1218 if (len != slen)
1219 {
1220 s = gfc_get_wide_string (len + 1);
1221 memcpy (s, expr->value.character.string,
1222 MIN (len, slen) * sizeof (gfc_char_t));
1223 if (len > slen)
1224 gfc_wide_memset (&s[slen], ' ', len - slen);
1225
1226 if (gfc_option.warn_character_truncation && slen > len)
1227 gfc_warning_now ("CHARACTER expression at %L is being truncated "
1228 "(%d/%d)", &expr->where, slen, len);
1229
1230 /* Apply the standard by 'hand' otherwise it gets cleared for
1231 initializers. */
1232 if (check_len != -1 && slen != check_len
1233 && !(gfc_option.allow_std & GFC_STD_GNU))
1234 gfc_error_now ("The CHARACTER elements of the array constructor "
1235 "at %L must have the same length (%d/%d)",
1236 &expr->where, slen, check_len);
1237
1238 s[len] = '\0';
1239 free (expr->value.character.string);
1240 expr->value.character.string = s;
1241 expr->value.character.length = len;
1242 }
1243 }
1244
1245
1246 /* Function to create and update the enumerator history
1247 using the information passed as arguments.
1248 Pointer "max_enum" is also updated, to point to
1249 enum history node containing largest initializer.
1250
1251 SYM points to the symbol node of enumerator.
1252 INIT points to its enumerator value. */
1253
1254 static void
create_enum_history(gfc_symbol * sym,gfc_expr * init)1255 create_enum_history (gfc_symbol *sym, gfc_expr *init)
1256 {
1257 enumerator_history *new_enum_history;
1258 gcc_assert (sym != NULL && init != NULL);
1259
1260 new_enum_history = XCNEW (enumerator_history);
1261
1262 new_enum_history->sym = sym;
1263 new_enum_history->initializer = init;
1264 new_enum_history->next = NULL;
1265
1266 if (enum_history == NULL)
1267 {
1268 enum_history = new_enum_history;
1269 max_enum = enum_history;
1270 }
1271 else
1272 {
1273 new_enum_history->next = enum_history;
1274 enum_history = new_enum_history;
1275
1276 if (mpz_cmp (max_enum->initializer->value.integer,
1277 new_enum_history->initializer->value.integer) < 0)
1278 max_enum = new_enum_history;
1279 }
1280 }
1281
1282
1283 /* Function to free enum kind history. */
1284
1285 void
gfc_free_enum_history(void)1286 gfc_free_enum_history (void)
1287 {
1288 enumerator_history *current = enum_history;
1289 enumerator_history *next;
1290
1291 while (current != NULL)
1292 {
1293 next = current->next;
1294 free (current);
1295 current = next;
1296 }
1297 max_enum = NULL;
1298 enum_history = NULL;
1299 }
1300
1301
1302 /* Function called by variable_decl() that adds an initialization
1303 expression to a symbol. */
1304
1305 static gfc_try
add_init_expr_to_sym(const char * name,gfc_expr ** initp,locus * var_locus)1306 add_init_expr_to_sym (const char *name, gfc_expr **initp, locus *var_locus)
1307 {
1308 symbol_attribute attr;
1309 gfc_symbol *sym;
1310 gfc_expr *init;
1311
1312 init = *initp;
1313 if (find_special (name, &sym, false))
1314 return FAILURE;
1315
1316 attr = sym->attr;
1317
1318 /* If this symbol is confirming an implicit parameter type,
1319 then an initialization expression is not allowed. */
1320 if (attr.flavor == FL_PARAMETER
1321 && sym->value != NULL
1322 && *initp != NULL)
1323 {
1324 gfc_error ("Initializer not allowed for PARAMETER '%s' at %C",
1325 sym->name);
1326 return FAILURE;
1327 }
1328
1329 if (init == NULL)
1330 {
1331 /* An initializer is required for PARAMETER declarations. */
1332 if (attr.flavor == FL_PARAMETER)
1333 {
1334 gfc_error ("PARAMETER at %L is missing an initializer", var_locus);
1335 return FAILURE;
1336 }
1337 }
1338 else
1339 {
1340 /* If a variable appears in a DATA block, it cannot have an
1341 initializer. */
1342 if (sym->attr.data)
1343 {
1344 gfc_error ("Variable '%s' at %C with an initializer already "
1345 "appears in a DATA statement", sym->name);
1346 return FAILURE;
1347 }
1348
1349 /* Check if the assignment can happen. This has to be put off
1350 until later for derived type variables and procedure pointers. */
1351 if (sym->ts.type != BT_DERIVED && init->ts.type != BT_DERIVED
1352 && sym->ts.type != BT_CLASS && init->ts.type != BT_CLASS
1353 && !sym->attr.proc_pointer
1354 && gfc_check_assign_symbol (sym, NULL, init) == FAILURE)
1355 return FAILURE;
1356
1357 if (sym->ts.type == BT_CHARACTER && sym->ts.u.cl
1358 && init->ts.type == BT_CHARACTER)
1359 {
1360 /* Update symbol character length according initializer. */
1361 if (gfc_check_assign_symbol (sym, NULL, init) == FAILURE)
1362 return FAILURE;
1363
1364 if (sym->ts.u.cl->length == NULL)
1365 {
1366 int clen;
1367 /* If there are multiple CHARACTER variables declared on the
1368 same line, we don't want them to share the same length. */
1369 sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
1370
1371 if (sym->attr.flavor == FL_PARAMETER)
1372 {
1373 if (init->expr_type == EXPR_CONSTANT)
1374 {
1375 clen = init->value.character.length;
1376 sym->ts.u.cl->length
1377 = gfc_get_int_expr (gfc_default_integer_kind,
1378 NULL, clen);
1379 }
1380 else if (init->expr_type == EXPR_ARRAY)
1381 {
1382 gfc_constructor *c;
1383 c = gfc_constructor_first (init->value.constructor);
1384 clen = c->expr->value.character.length;
1385 sym->ts.u.cl->length
1386 = gfc_get_int_expr (gfc_default_integer_kind,
1387 NULL, clen);
1388 }
1389 else if (init->ts.u.cl && init->ts.u.cl->length)
1390 sym->ts.u.cl->length =
1391 gfc_copy_expr (sym->value->ts.u.cl->length);
1392 }
1393 }
1394 /* Update initializer character length according symbol. */
1395 else if (sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
1396 {
1397 int len = mpz_get_si (sym->ts.u.cl->length->value.integer);
1398
1399 if (init->expr_type == EXPR_CONSTANT)
1400 gfc_set_constant_character_len (len, init, -1);
1401 else if (init->expr_type == EXPR_ARRAY)
1402 {
1403 gfc_constructor *c;
1404
1405 /* Build a new charlen to prevent simplification from
1406 deleting the length before it is resolved. */
1407 init->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
1408 init->ts.u.cl->length = gfc_copy_expr (sym->ts.u.cl->length);
1409
1410 for (c = gfc_constructor_first (init->value.constructor);
1411 c; c = gfc_constructor_next (c))
1412 gfc_set_constant_character_len (len, c->expr, -1);
1413 }
1414 }
1415 }
1416
1417 /* If sym is implied-shape, set its upper bounds from init. */
1418 if (sym->attr.flavor == FL_PARAMETER && sym->attr.dimension
1419 && sym->as->type == AS_IMPLIED_SHAPE)
1420 {
1421 int dim;
1422
1423 if (init->rank == 0)
1424 {
1425 gfc_error ("Can't initialize implied-shape array at %L"
1426 " with scalar", &sym->declared_at);
1427 return FAILURE;
1428 }
1429 gcc_assert (sym->as->rank == init->rank);
1430
1431 /* Shape should be present, we get an initialization expression. */
1432 gcc_assert (init->shape);
1433
1434 for (dim = 0; dim < sym->as->rank; ++dim)
1435 {
1436 int k;
1437 gfc_expr* lower;
1438 gfc_expr* e;
1439
1440 lower = sym->as->lower[dim];
1441 if (lower->expr_type != EXPR_CONSTANT)
1442 {
1443 gfc_error ("Non-constant lower bound in implied-shape"
1444 " declaration at %L", &lower->where);
1445 return FAILURE;
1446 }
1447
1448 /* All dimensions must be without upper bound. */
1449 gcc_assert (!sym->as->upper[dim]);
1450
1451 k = lower->ts.kind;
1452 e = gfc_get_constant_expr (BT_INTEGER, k, &sym->declared_at);
1453 mpz_add (e->value.integer,
1454 lower->value.integer, init->shape[dim]);
1455 mpz_sub_ui (e->value.integer, e->value.integer, 1);
1456 sym->as->upper[dim] = e;
1457 }
1458
1459 sym->as->type = AS_EXPLICIT;
1460 }
1461
1462 /* Need to check if the expression we initialized this
1463 to was one of the iso_c_binding named constants. If so,
1464 and we're a parameter (constant), let it be iso_c.
1465 For example:
1466 integer(c_int), parameter :: my_int = c_int
1467 integer(my_int) :: my_int_2
1468 If we mark my_int as iso_c (since we can see it's value
1469 is equal to one of the named constants), then my_int_2
1470 will be considered C interoperable. */
1471 if (sym->ts.type != BT_CHARACTER && sym->ts.type != BT_DERIVED)
1472 {
1473 sym->ts.is_iso_c |= init->ts.is_iso_c;
1474 sym->ts.is_c_interop |= init->ts.is_c_interop;
1475 /* attr bits needed for module files. */
1476 sym->attr.is_iso_c |= init->ts.is_iso_c;
1477 sym->attr.is_c_interop |= init->ts.is_c_interop;
1478 if (init->ts.is_iso_c)
1479 sym->ts.f90_type = init->ts.f90_type;
1480 }
1481
1482 /* Add initializer. Make sure we keep the ranks sane. */
1483 if (sym->attr.dimension && init->rank == 0)
1484 {
1485 mpz_t size;
1486 gfc_expr *array;
1487 int n;
1488 if (sym->attr.flavor == FL_PARAMETER
1489 && init->expr_type == EXPR_CONSTANT
1490 && spec_size (sym->as, &size) == SUCCESS
1491 && mpz_cmp_si (size, 0) > 0)
1492 {
1493 array = gfc_get_array_expr (init->ts.type, init->ts.kind,
1494 &init->where);
1495 for (n = 0; n < (int)mpz_get_si (size); n++)
1496 gfc_constructor_append_expr (&array->value.constructor,
1497 n == 0
1498 ? init
1499 : gfc_copy_expr (init),
1500 &init->where);
1501
1502 array->shape = gfc_get_shape (sym->as->rank);
1503 for (n = 0; n < sym->as->rank; n++)
1504 spec_dimen_size (sym->as, n, &array->shape[n]);
1505
1506 init = array;
1507 mpz_clear (size);
1508 }
1509 init->rank = sym->as->rank;
1510 }
1511
1512 sym->value = init;
1513 if (sym->attr.save == SAVE_NONE)
1514 sym->attr.save = SAVE_IMPLICIT;
1515 *initp = NULL;
1516 }
1517
1518 return SUCCESS;
1519 }
1520
1521
1522 /* Function called by variable_decl() that adds a name to a structure
1523 being built. */
1524
1525 static gfc_try
build_struct(const char * name,gfc_charlen * cl,gfc_expr ** init,gfc_array_spec ** as)1526 build_struct (const char *name, gfc_charlen *cl, gfc_expr **init,
1527 gfc_array_spec **as)
1528 {
1529 gfc_component *c;
1530 gfc_try t = SUCCESS;
1531
1532 /* F03:C438/C439. If the current symbol is of the same derived type that we're
1533 constructing, it must have the pointer attribute. */
1534 if ((current_ts.type == BT_DERIVED || current_ts.type == BT_CLASS)
1535 && current_ts.u.derived == gfc_current_block ()
1536 && current_attr.pointer == 0)
1537 {
1538 gfc_error ("Component at %C must have the POINTER attribute");
1539 return FAILURE;
1540 }
1541
1542 if (gfc_current_block ()->attr.pointer && (*as)->rank != 0)
1543 {
1544 if ((*as)->type != AS_DEFERRED && (*as)->type != AS_EXPLICIT)
1545 {
1546 gfc_error ("Array component of structure at %C must have explicit "
1547 "or deferred shape");
1548 return FAILURE;
1549 }
1550 }
1551
1552 if (gfc_add_component (gfc_current_block (), name, &c) == FAILURE)
1553 return FAILURE;
1554
1555 c->ts = current_ts;
1556 if (c->ts.type == BT_CHARACTER)
1557 c->ts.u.cl = cl;
1558 c->attr = current_attr;
1559
1560 c->initializer = *init;
1561 *init = NULL;
1562
1563 c->as = *as;
1564 if (c->as != NULL)
1565 {
1566 if (c->as->corank)
1567 c->attr.codimension = 1;
1568 if (c->as->rank)
1569 c->attr.dimension = 1;
1570 }
1571 *as = NULL;
1572
1573 /* Should this ever get more complicated, combine with similar section
1574 in add_init_expr_to_sym into a separate function. */
1575 if (c->ts.type == BT_CHARACTER && !c->attr.pointer && c->initializer
1576 && c->ts.u.cl
1577 && c->ts.u.cl->length && c->ts.u.cl->length->expr_type == EXPR_CONSTANT)
1578 {
1579 int len;
1580
1581 gcc_assert (c->ts.u.cl && c->ts.u.cl->length);
1582 gcc_assert (c->ts.u.cl->length->expr_type == EXPR_CONSTANT);
1583 gcc_assert (c->ts.u.cl->length->ts.type == BT_INTEGER);
1584
1585 len = mpz_get_si (c->ts.u.cl->length->value.integer);
1586
1587 if (c->initializer->expr_type == EXPR_CONSTANT)
1588 gfc_set_constant_character_len (len, c->initializer, -1);
1589 else if (mpz_cmp (c->ts.u.cl->length->value.integer,
1590 c->initializer->ts.u.cl->length->value.integer))
1591 {
1592 gfc_constructor *ctor;
1593 ctor = gfc_constructor_first (c->initializer->value.constructor);
1594
1595 if (ctor)
1596 {
1597 int first_len;
1598 bool has_ts = (c->initializer->ts.u.cl
1599 && c->initializer->ts.u.cl->length_from_typespec);
1600
1601 /* Remember the length of the first element for checking
1602 that all elements *in the constructor* have the same
1603 length. This need not be the length of the LHS! */
1604 gcc_assert (ctor->expr->expr_type == EXPR_CONSTANT);
1605 gcc_assert (ctor->expr->ts.type == BT_CHARACTER);
1606 first_len = ctor->expr->value.character.length;
1607
1608 for ( ; ctor; ctor = gfc_constructor_next (ctor))
1609 if (ctor->expr->expr_type == EXPR_CONSTANT)
1610 {
1611 gfc_set_constant_character_len (len, ctor->expr,
1612 has_ts ? -1 : first_len);
1613 ctor->expr->ts.u.cl->length = gfc_copy_expr (c->ts.u.cl->length);
1614 }
1615 }
1616 }
1617 }
1618
1619 /* Check array components. */
1620 if (!c->attr.dimension)
1621 goto scalar;
1622
1623 if (c->attr.pointer)
1624 {
1625 if (c->as->type != AS_DEFERRED)
1626 {
1627 gfc_error ("Pointer array component of structure at %C must have a "
1628 "deferred shape");
1629 t = FAILURE;
1630 }
1631 }
1632 else if (c->attr.allocatable)
1633 {
1634 if (c->as->type != AS_DEFERRED)
1635 {
1636 gfc_error ("Allocatable component of structure at %C must have a "
1637 "deferred shape");
1638 t = FAILURE;
1639 }
1640 }
1641 else
1642 {
1643 if (c->as->type != AS_EXPLICIT)
1644 {
1645 gfc_error ("Array component of structure at %C must have an "
1646 "explicit shape");
1647 t = FAILURE;
1648 }
1649 }
1650
1651 scalar:
1652 if (c->ts.type == BT_CLASS)
1653 {
1654 bool delayed = (gfc_state_stack->sym == c->ts.u.derived)
1655 || (!c->ts.u.derived->components
1656 && !c->ts.u.derived->attr.zero_comp);
1657 gfc_try t2 = gfc_build_class_symbol (&c->ts, &c->attr, &c->as, delayed);
1658
1659 if (t != FAILURE)
1660 t = t2;
1661 }
1662
1663 return t;
1664 }
1665
1666
1667 /* Match a 'NULL()', and possibly take care of some side effects. */
1668
1669 match
gfc_match_null(gfc_expr ** result)1670 gfc_match_null (gfc_expr **result)
1671 {
1672 gfc_symbol *sym;
1673 match m, m2 = MATCH_NO;
1674
1675 if ((m = gfc_match (" null ( )")) == MATCH_ERROR)
1676 return MATCH_ERROR;
1677
1678 if (m == MATCH_NO)
1679 {
1680 locus old_loc;
1681 char name[GFC_MAX_SYMBOL_LEN + 1];
1682
1683 if ((m2 = gfc_match (" null (")) != MATCH_YES)
1684 return m2;
1685
1686 old_loc = gfc_current_locus;
1687 if ((m2 = gfc_match (" %n ) ", name)) == MATCH_ERROR)
1688 return MATCH_ERROR;
1689 if (m2 != MATCH_YES
1690 && ((m2 = gfc_match (" mold = %n )", name)) == MATCH_ERROR))
1691 return MATCH_ERROR;
1692 if (m2 == MATCH_NO)
1693 {
1694 gfc_current_locus = old_loc;
1695 return MATCH_NO;
1696 }
1697 }
1698
1699 /* The NULL symbol now has to be/become an intrinsic function. */
1700 if (gfc_get_symbol ("null", NULL, &sym))
1701 {
1702 gfc_error ("NULL() initialization at %C is ambiguous");
1703 return MATCH_ERROR;
1704 }
1705
1706 gfc_intrinsic_symbol (sym);
1707
1708 if (sym->attr.proc != PROC_INTRINSIC
1709 && (gfc_add_procedure (&sym->attr, PROC_INTRINSIC,
1710 sym->name, NULL) == FAILURE
1711 || gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE))
1712 return MATCH_ERROR;
1713
1714 *result = gfc_get_null_expr (&gfc_current_locus);
1715
1716 /* Invalid per F2008, C512. */
1717 if (m2 == MATCH_YES)
1718 {
1719 gfc_error ("NULL() initialization at %C may not have MOLD");
1720 return MATCH_ERROR;
1721 }
1722
1723 return MATCH_YES;
1724 }
1725
1726
1727 /* Match the initialization expr for a data pointer or procedure pointer. */
1728
1729 static match
match_pointer_init(gfc_expr ** init,int procptr)1730 match_pointer_init (gfc_expr **init, int procptr)
1731 {
1732 match m;
1733
1734 if (gfc_pure (NULL) && gfc_state_stack->state != COMP_DERIVED)
1735 {
1736 gfc_error ("Initialization of pointer at %C is not allowed in "
1737 "a PURE procedure");
1738 return MATCH_ERROR;
1739 }
1740
1741 /* Match NULL() initialization. */
1742 m = gfc_match_null (init);
1743 if (m != MATCH_NO)
1744 return m;
1745
1746 /* Match non-NULL initialization. */
1747 gfc_matching_ptr_assignment = !procptr;
1748 gfc_matching_procptr_assignment = procptr;
1749 m = gfc_match_rvalue (init);
1750 gfc_matching_ptr_assignment = 0;
1751 gfc_matching_procptr_assignment = 0;
1752 if (m == MATCH_ERROR)
1753 return MATCH_ERROR;
1754 else if (m == MATCH_NO)
1755 {
1756 gfc_error ("Error in pointer initialization at %C");
1757 return MATCH_ERROR;
1758 }
1759
1760 if (!procptr)
1761 gfc_resolve_expr (*init);
1762
1763 if (gfc_notify_std (GFC_STD_F2008, "non-NULL pointer "
1764 "initialization at %C") == FAILURE)
1765 return MATCH_ERROR;
1766
1767 return MATCH_YES;
1768 }
1769
1770
1771 static gfc_try
check_function_name(char * name)1772 check_function_name (char *name)
1773 {
1774 /* In functions that have a RESULT variable defined, the function name always
1775 refers to function calls. Therefore, the name is not allowed to appear in
1776 specification statements. When checking this, be careful about
1777 'hidden' procedure pointer results ('ppr@'). */
1778
1779 if (gfc_current_state () == COMP_FUNCTION)
1780 {
1781 gfc_symbol *block = gfc_current_block ();
1782 if (block && block->result && block->result != block
1783 && strcmp (block->result->name, "ppr@") != 0
1784 && strcmp (block->name, name) == 0)
1785 {
1786 gfc_error ("Function name '%s' not allowed at %C", name);
1787 return FAILURE;
1788 }
1789 }
1790
1791 return SUCCESS;
1792 }
1793
1794
1795 /* Match a variable name with an optional initializer. When this
1796 subroutine is called, a variable is expected to be parsed next.
1797 Depending on what is happening at the moment, updates either the
1798 symbol table or the current interface. */
1799
1800 static match
variable_decl(int elem)1801 variable_decl (int elem)
1802 {
1803 char name[GFC_MAX_SYMBOL_LEN + 1];
1804 gfc_expr *initializer, *char_len;
1805 gfc_array_spec *as;
1806 gfc_array_spec *cp_as; /* Extra copy for Cray Pointees. */
1807 gfc_charlen *cl;
1808 bool cl_deferred;
1809 locus var_locus;
1810 match m;
1811 gfc_try t;
1812 gfc_symbol *sym;
1813
1814 initializer = NULL;
1815 as = NULL;
1816 cp_as = NULL;
1817
1818 /* When we get here, we've just matched a list of attributes and
1819 maybe a type and a double colon. The next thing we expect to see
1820 is the name of the symbol. */
1821 m = gfc_match_name (name);
1822 if (m != MATCH_YES)
1823 goto cleanup;
1824
1825 var_locus = gfc_current_locus;
1826
1827 /* Now we could see the optional array spec. or character length. */
1828 m = gfc_match_array_spec (&as, true, true);
1829 if (m == MATCH_ERROR)
1830 goto cleanup;
1831
1832 if (m == MATCH_NO)
1833 as = gfc_copy_array_spec (current_as);
1834 else if (current_as
1835 && merge_array_spec (current_as, as, true) == FAILURE)
1836 {
1837 m = MATCH_ERROR;
1838 goto cleanup;
1839 }
1840
1841 if (gfc_option.flag_cray_pointer)
1842 cp_as = gfc_copy_array_spec (as);
1843
1844 /* At this point, we know for sure if the symbol is PARAMETER and can thus
1845 determine (and check) whether it can be implied-shape. If it
1846 was parsed as assumed-size, change it because PARAMETERs can not
1847 be assumed-size. */
1848 if (as)
1849 {
1850 if (as->type == AS_IMPLIED_SHAPE && current_attr.flavor != FL_PARAMETER)
1851 {
1852 m = MATCH_ERROR;
1853 gfc_error ("Non-PARAMETER symbol '%s' at %L can't be implied-shape",
1854 name, &var_locus);
1855 goto cleanup;
1856 }
1857
1858 if (as->type == AS_ASSUMED_SIZE && as->rank == 1
1859 && current_attr.flavor == FL_PARAMETER)
1860 as->type = AS_IMPLIED_SHAPE;
1861
1862 if (as->type == AS_IMPLIED_SHAPE
1863 && gfc_notify_std (GFC_STD_F2008,
1864 "Implied-shape array at %L",
1865 &var_locus) == FAILURE)
1866 {
1867 m = MATCH_ERROR;
1868 goto cleanup;
1869 }
1870 }
1871
1872 char_len = NULL;
1873 cl = NULL;
1874 cl_deferred = false;
1875
1876 if (current_ts.type == BT_CHARACTER)
1877 {
1878 switch (match_char_length (&char_len, &cl_deferred, false))
1879 {
1880 case MATCH_YES:
1881 cl = gfc_new_charlen (gfc_current_ns, NULL);
1882
1883 cl->length = char_len;
1884 break;
1885
1886 /* Non-constant lengths need to be copied after the first
1887 element. Also copy assumed lengths. */
1888 case MATCH_NO:
1889 if (elem > 1
1890 && (current_ts.u.cl->length == NULL
1891 || current_ts.u.cl->length->expr_type != EXPR_CONSTANT))
1892 {
1893 cl = gfc_new_charlen (gfc_current_ns, NULL);
1894 cl->length = gfc_copy_expr (current_ts.u.cl->length);
1895 }
1896 else
1897 cl = current_ts.u.cl;
1898
1899 cl_deferred = current_ts.deferred;
1900
1901 break;
1902
1903 case MATCH_ERROR:
1904 goto cleanup;
1905 }
1906 }
1907
1908 /* If this symbol has already shown up in a Cray Pointer declaration,
1909 then we want to set the type & bail out. */
1910 if (gfc_option.flag_cray_pointer)
1911 {
1912 gfc_find_symbol (name, gfc_current_ns, 1, &sym);
1913 if (sym != NULL && sym->attr.cray_pointee)
1914 {
1915 sym->ts.type = current_ts.type;
1916 sym->ts.kind = current_ts.kind;
1917 sym->ts.u.cl = cl;
1918 sym->ts.u.derived = current_ts.u.derived;
1919 sym->ts.is_c_interop = current_ts.is_c_interop;
1920 sym->ts.is_iso_c = current_ts.is_iso_c;
1921 m = MATCH_YES;
1922
1923 /* Check to see if we have an array specification. */
1924 if (cp_as != NULL)
1925 {
1926 if (sym->as != NULL)
1927 {
1928 gfc_error ("Duplicate array spec for Cray pointee at %C");
1929 gfc_free_array_spec (cp_as);
1930 m = MATCH_ERROR;
1931 goto cleanup;
1932 }
1933 else
1934 {
1935 if (gfc_set_array_spec (sym, cp_as, &var_locus) == FAILURE)
1936 gfc_internal_error ("Couldn't set pointee array spec.");
1937
1938 /* Fix the array spec. */
1939 m = gfc_mod_pointee_as (sym->as);
1940 if (m == MATCH_ERROR)
1941 goto cleanup;
1942 }
1943 }
1944 goto cleanup;
1945 }
1946 else
1947 {
1948 gfc_free_array_spec (cp_as);
1949 }
1950 }
1951
1952 /* Procedure pointer as function result. */
1953 if (gfc_current_state () == COMP_FUNCTION
1954 && strcmp ("ppr@", gfc_current_block ()->name) == 0
1955 && strcmp (name, gfc_current_block ()->ns->proc_name->name) == 0)
1956 strcpy (name, "ppr@");
1957
1958 if (gfc_current_state () == COMP_FUNCTION
1959 && strcmp (name, gfc_current_block ()->name) == 0
1960 && gfc_current_block ()->result
1961 && strcmp ("ppr@", gfc_current_block ()->result->name) == 0)
1962 strcpy (name, "ppr@");
1963
1964 /* OK, we've successfully matched the declaration. Now put the
1965 symbol in the current namespace, because it might be used in the
1966 optional initialization expression for this symbol, e.g. this is
1967 perfectly legal:
1968
1969 integer, parameter :: i = huge(i)
1970
1971 This is only true for parameters or variables of a basic type.
1972 For components of derived types, it is not true, so we don't
1973 create a symbol for those yet. If we fail to create the symbol,
1974 bail out. */
1975 if (gfc_current_state () != COMP_DERIVED
1976 && build_sym (name, cl, cl_deferred, &as, &var_locus) == FAILURE)
1977 {
1978 m = MATCH_ERROR;
1979 goto cleanup;
1980 }
1981
1982 if (check_function_name (name) == FAILURE)
1983 {
1984 m = MATCH_ERROR;
1985 goto cleanup;
1986 }
1987
1988 /* We allow old-style initializations of the form
1989 integer i /2/, j(4) /3*3, 1/
1990 (if no colon has been seen). These are different from data
1991 statements in that initializers are only allowed to apply to the
1992 variable immediately preceding, i.e.
1993 integer i, j /1, 2/
1994 is not allowed. Therefore we have to do some work manually, that
1995 could otherwise be left to the matchers for DATA statements. */
1996
1997 if (!colon_seen && gfc_match (" /") == MATCH_YES)
1998 {
1999 if (gfc_notify_std (GFC_STD_GNU, "Old-style "
2000 "initialization at %C") == FAILURE)
2001 return MATCH_ERROR;
2002
2003 return match_old_style_init (name);
2004 }
2005
2006 /* The double colon must be present in order to have initializers.
2007 Otherwise the statement is ambiguous with an assignment statement. */
2008 if (colon_seen)
2009 {
2010 if (gfc_match (" =>") == MATCH_YES)
2011 {
2012 if (!current_attr.pointer)
2013 {
2014 gfc_error ("Initialization at %C isn't for a pointer variable");
2015 m = MATCH_ERROR;
2016 goto cleanup;
2017 }
2018
2019 m = match_pointer_init (&initializer, 0);
2020 if (m != MATCH_YES)
2021 goto cleanup;
2022 }
2023 else if (gfc_match_char ('=') == MATCH_YES)
2024 {
2025 if (current_attr.pointer)
2026 {
2027 gfc_error ("Pointer initialization at %C requires '=>', "
2028 "not '='");
2029 m = MATCH_ERROR;
2030 goto cleanup;
2031 }
2032
2033 m = gfc_match_init_expr (&initializer);
2034 if (m == MATCH_NO)
2035 {
2036 gfc_error ("Expected an initialization expression at %C");
2037 m = MATCH_ERROR;
2038 }
2039
2040 if (current_attr.flavor != FL_PARAMETER && gfc_pure (NULL)
2041 && gfc_state_stack->state != COMP_DERIVED)
2042 {
2043 gfc_error ("Initialization of variable at %C is not allowed in "
2044 "a PURE procedure");
2045 m = MATCH_ERROR;
2046 }
2047
2048 if (m != MATCH_YES)
2049 goto cleanup;
2050 }
2051 }
2052
2053 if (initializer != NULL && current_attr.allocatable
2054 && gfc_current_state () == COMP_DERIVED)
2055 {
2056 gfc_error ("Initialization of allocatable component at %C is not "
2057 "allowed");
2058 m = MATCH_ERROR;
2059 goto cleanup;
2060 }
2061
2062 /* Add the initializer. Note that it is fine if initializer is
2063 NULL here, because we sometimes also need to check if a
2064 declaration *must* have an initialization expression. */
2065 if (gfc_current_state () != COMP_DERIVED)
2066 t = add_init_expr_to_sym (name, &initializer, &var_locus);
2067 else
2068 {
2069 if (current_ts.type == BT_DERIVED
2070 && !current_attr.pointer && !initializer)
2071 initializer = gfc_default_initializer (¤t_ts);
2072 t = build_struct (name, cl, &initializer, &as);
2073 }
2074
2075 m = (t == SUCCESS) ? MATCH_YES : MATCH_ERROR;
2076
2077 cleanup:
2078 /* Free stuff up and return. */
2079 gfc_free_expr (initializer);
2080 gfc_free_array_spec (as);
2081
2082 return m;
2083 }
2084
2085
2086 /* Match an extended-f77 "TYPESPEC*bytesize"-style kind specification.
2087 This assumes that the byte size is equal to the kind number for
2088 non-COMPLEX types, and equal to twice the kind number for COMPLEX. */
2089
2090 match
gfc_match_old_kind_spec(gfc_typespec * ts)2091 gfc_match_old_kind_spec (gfc_typespec *ts)
2092 {
2093 match m;
2094 int original_kind;
2095
2096 if (gfc_match_char ('*') != MATCH_YES)
2097 return MATCH_NO;
2098
2099 m = gfc_match_small_literal_int (&ts->kind, NULL);
2100 if (m != MATCH_YES)
2101 return MATCH_ERROR;
2102
2103 original_kind = ts->kind;
2104
2105 /* Massage the kind numbers for complex types. */
2106 if (ts->type == BT_COMPLEX)
2107 {
2108 if (ts->kind % 2)
2109 {
2110 gfc_error ("Old-style type declaration %s*%d not supported at %C",
2111 gfc_basic_typename (ts->type), original_kind);
2112 return MATCH_ERROR;
2113 }
2114 ts->kind /= 2;
2115
2116 }
2117
2118 if (ts->type == BT_INTEGER && ts->kind == 4 && gfc_option.flag_integer4_kind == 8)
2119 ts->kind = 8;
2120
2121 if (ts->type == BT_REAL || ts->type == BT_COMPLEX)
2122 {
2123 if (ts->kind == 4)
2124 {
2125 if (gfc_option.flag_real4_kind == 8)
2126 ts->kind = 8;
2127 if (gfc_option.flag_real4_kind == 10)
2128 ts->kind = 10;
2129 if (gfc_option.flag_real4_kind == 16)
2130 ts->kind = 16;
2131 }
2132
2133 if (ts->kind == 8)
2134 {
2135 if (gfc_option.flag_real8_kind == 4)
2136 ts->kind = 4;
2137 if (gfc_option.flag_real8_kind == 10)
2138 ts->kind = 10;
2139 if (gfc_option.flag_real8_kind == 16)
2140 ts->kind = 16;
2141 }
2142 }
2143
2144 if (gfc_validate_kind (ts->type, ts->kind, true) < 0)
2145 {
2146 gfc_error ("Old-style type declaration %s*%d not supported at %C",
2147 gfc_basic_typename (ts->type), original_kind);
2148 return MATCH_ERROR;
2149 }
2150
2151 if (gfc_notify_std (GFC_STD_GNU, "Nonstandard type declaration %s*%d at %C",
2152 gfc_basic_typename (ts->type), original_kind) == FAILURE)
2153 return MATCH_ERROR;
2154
2155 return MATCH_YES;
2156 }
2157
2158
2159 /* Match a kind specification. Since kinds are generally optional, we
2160 usually return MATCH_NO if something goes wrong. If a "kind="
2161 string is found, then we know we have an error. */
2162
2163 match
gfc_match_kind_spec(gfc_typespec * ts,bool kind_expr_only)2164 gfc_match_kind_spec (gfc_typespec *ts, bool kind_expr_only)
2165 {
2166 locus where, loc;
2167 gfc_expr *e;
2168 match m, n;
2169 char c;
2170 const char *msg;
2171
2172 m = MATCH_NO;
2173 n = MATCH_YES;
2174 e = NULL;
2175
2176 where = loc = gfc_current_locus;
2177
2178 if (kind_expr_only)
2179 goto kind_expr;
2180
2181 if (gfc_match_char ('(') == MATCH_NO)
2182 return MATCH_NO;
2183
2184 /* Also gobbles optional text. */
2185 if (gfc_match (" kind = ") == MATCH_YES)
2186 m = MATCH_ERROR;
2187
2188 loc = gfc_current_locus;
2189
2190 kind_expr:
2191 n = gfc_match_init_expr (&e);
2192
2193 if (n != MATCH_YES)
2194 {
2195 if (gfc_matching_function)
2196 {
2197 /* The function kind expression might include use associated or
2198 imported parameters and try again after the specification
2199 expressions..... */
2200 if (gfc_match_char (')') != MATCH_YES)
2201 {
2202 gfc_error ("Missing right parenthesis at %C");
2203 m = MATCH_ERROR;
2204 goto no_match;
2205 }
2206
2207 gfc_free_expr (e);
2208 gfc_undo_symbols ();
2209 return MATCH_YES;
2210 }
2211 else
2212 {
2213 /* ....or else, the match is real. */
2214 if (n == MATCH_NO)
2215 gfc_error ("Expected initialization expression at %C");
2216 if (n != MATCH_YES)
2217 return MATCH_ERROR;
2218 }
2219 }
2220
2221 if (e->rank != 0)
2222 {
2223 gfc_error ("Expected scalar initialization expression at %C");
2224 m = MATCH_ERROR;
2225 goto no_match;
2226 }
2227
2228 msg = gfc_extract_int (e, &ts->kind);
2229
2230 if (msg != NULL)
2231 {
2232 gfc_error (msg);
2233 m = MATCH_ERROR;
2234 goto no_match;
2235 }
2236
2237 /* Before throwing away the expression, let's see if we had a
2238 C interoperable kind (and store the fact). */
2239 if (e->ts.is_c_interop == 1)
2240 {
2241 /* Mark this as C interoperable if being declared with one
2242 of the named constants from iso_c_binding. */
2243 ts->is_c_interop = e->ts.is_iso_c;
2244 ts->f90_type = e->ts.f90_type;
2245 }
2246
2247 gfc_free_expr (e);
2248 e = NULL;
2249
2250 /* Ignore errors to this point, if we've gotten here. This means
2251 we ignore the m=MATCH_ERROR from above. */
2252 if (gfc_validate_kind (ts->type, ts->kind, true) < 0)
2253 {
2254 gfc_error ("Kind %d not supported for type %s at %C", ts->kind,
2255 gfc_basic_typename (ts->type));
2256 gfc_current_locus = where;
2257 return MATCH_ERROR;
2258 }
2259
2260 /* Warn if, e.g., c_int is used for a REAL variable, but not
2261 if, e.g., c_double is used for COMPLEX as the standard
2262 explicitly says that the kind type parameter for complex and real
2263 variable is the same, i.e. c_float == c_float_complex. */
2264 if (ts->f90_type != BT_UNKNOWN && ts->f90_type != ts->type
2265 && !((ts->f90_type == BT_REAL && ts->type == BT_COMPLEX)
2266 || (ts->f90_type == BT_COMPLEX && ts->type == BT_REAL)))
2267 gfc_warning_now ("C kind type parameter is for type %s but type at %L "
2268 "is %s", gfc_basic_typename (ts->f90_type), &where,
2269 gfc_basic_typename (ts->type));
2270
2271 gfc_gobble_whitespace ();
2272 if ((c = gfc_next_ascii_char ()) != ')'
2273 && (ts->type != BT_CHARACTER || c != ','))
2274 {
2275 if (ts->type == BT_CHARACTER)
2276 gfc_error ("Missing right parenthesis or comma at %C");
2277 else
2278 gfc_error ("Missing right parenthesis at %C");
2279 m = MATCH_ERROR;
2280 }
2281 else
2282 /* All tests passed. */
2283 m = MATCH_YES;
2284
2285 if(m == MATCH_ERROR)
2286 gfc_current_locus = where;
2287
2288 if (ts->type == BT_INTEGER && ts->kind == 4 && gfc_option.flag_integer4_kind == 8)
2289 ts->kind = 8;
2290
2291 if (ts->type == BT_REAL || ts->type == BT_COMPLEX)
2292 {
2293 if (ts->kind == 4)
2294 {
2295 if (gfc_option.flag_real4_kind == 8)
2296 ts->kind = 8;
2297 if (gfc_option.flag_real4_kind == 10)
2298 ts->kind = 10;
2299 if (gfc_option.flag_real4_kind == 16)
2300 ts->kind = 16;
2301 }
2302
2303 if (ts->kind == 8)
2304 {
2305 if (gfc_option.flag_real8_kind == 4)
2306 ts->kind = 4;
2307 if (gfc_option.flag_real8_kind == 10)
2308 ts->kind = 10;
2309 if (gfc_option.flag_real8_kind == 16)
2310 ts->kind = 16;
2311 }
2312 }
2313
2314 /* Return what we know from the test(s). */
2315 return m;
2316
2317 no_match:
2318 gfc_free_expr (e);
2319 gfc_current_locus = where;
2320 return m;
2321 }
2322
2323
2324 static match
match_char_kind(int * kind,int * is_iso_c)2325 match_char_kind (int * kind, int * is_iso_c)
2326 {
2327 locus where;
2328 gfc_expr *e;
2329 match m, n;
2330 const char *msg;
2331
2332 m = MATCH_NO;
2333 e = NULL;
2334 where = gfc_current_locus;
2335
2336 n = gfc_match_init_expr (&e);
2337
2338 if (n != MATCH_YES && gfc_matching_function)
2339 {
2340 /* The expression might include use-associated or imported
2341 parameters and try again after the specification
2342 expressions. */
2343 gfc_free_expr (e);
2344 gfc_undo_symbols ();
2345 return MATCH_YES;
2346 }
2347
2348 if (n == MATCH_NO)
2349 gfc_error ("Expected initialization expression at %C");
2350 if (n != MATCH_YES)
2351 return MATCH_ERROR;
2352
2353 if (e->rank != 0)
2354 {
2355 gfc_error ("Expected scalar initialization expression at %C");
2356 m = MATCH_ERROR;
2357 goto no_match;
2358 }
2359
2360 msg = gfc_extract_int (e, kind);
2361 *is_iso_c = e->ts.is_iso_c;
2362 if (msg != NULL)
2363 {
2364 gfc_error (msg);
2365 m = MATCH_ERROR;
2366 goto no_match;
2367 }
2368
2369 gfc_free_expr (e);
2370
2371 /* Ignore errors to this point, if we've gotten here. This means
2372 we ignore the m=MATCH_ERROR from above. */
2373 if (gfc_validate_kind (BT_CHARACTER, *kind, true) < 0)
2374 {
2375 gfc_error ("Kind %d is not supported for CHARACTER at %C", *kind);
2376 m = MATCH_ERROR;
2377 }
2378 else
2379 /* All tests passed. */
2380 m = MATCH_YES;
2381
2382 if (m == MATCH_ERROR)
2383 gfc_current_locus = where;
2384
2385 /* Return what we know from the test(s). */
2386 return m;
2387
2388 no_match:
2389 gfc_free_expr (e);
2390 gfc_current_locus = where;
2391 return m;
2392 }
2393
2394
2395 /* Match the various kind/length specifications in a CHARACTER
2396 declaration. We don't return MATCH_NO. */
2397
2398 match
gfc_match_char_spec(gfc_typespec * ts)2399 gfc_match_char_spec (gfc_typespec *ts)
2400 {
2401 int kind, seen_length, is_iso_c;
2402 gfc_charlen *cl;
2403 gfc_expr *len;
2404 match m;
2405 bool deferred;
2406
2407 len = NULL;
2408 seen_length = 0;
2409 kind = 0;
2410 is_iso_c = 0;
2411 deferred = false;
2412
2413 /* Try the old-style specification first. */
2414 old_char_selector = 0;
2415
2416 m = match_char_length (&len, &deferred, true);
2417 if (m != MATCH_NO)
2418 {
2419 if (m == MATCH_YES)
2420 old_char_selector = 1;
2421 seen_length = 1;
2422 goto done;
2423 }
2424
2425 m = gfc_match_char ('(');
2426 if (m != MATCH_YES)
2427 {
2428 m = MATCH_YES; /* Character without length is a single char. */
2429 goto done;
2430 }
2431
2432 /* Try the weird case: ( KIND = <int> [ , LEN = <len-param> ] ). */
2433 if (gfc_match (" kind =") == MATCH_YES)
2434 {
2435 m = match_char_kind (&kind, &is_iso_c);
2436
2437 if (m == MATCH_ERROR)
2438 goto done;
2439 if (m == MATCH_NO)
2440 goto syntax;
2441
2442 if (gfc_match (" , len =") == MATCH_NO)
2443 goto rparen;
2444
2445 m = char_len_param_value (&len, &deferred);
2446 if (m == MATCH_NO)
2447 goto syntax;
2448 if (m == MATCH_ERROR)
2449 goto done;
2450 seen_length = 1;
2451
2452 goto rparen;
2453 }
2454
2455 /* Try to match "LEN = <len-param>" or "LEN = <len-param>, KIND = <int>". */
2456 if (gfc_match (" len =") == MATCH_YES)
2457 {
2458 m = char_len_param_value (&len, &deferred);
2459 if (m == MATCH_NO)
2460 goto syntax;
2461 if (m == MATCH_ERROR)
2462 goto done;
2463 seen_length = 1;
2464
2465 if (gfc_match_char (')') == MATCH_YES)
2466 goto done;
2467
2468 if (gfc_match (" , kind =") != MATCH_YES)
2469 goto syntax;
2470
2471 if (match_char_kind (&kind, &is_iso_c) == MATCH_ERROR)
2472 goto done;
2473
2474 goto rparen;
2475 }
2476
2477 /* Try to match ( <len-param> ) or ( <len-param> , [ KIND = ] <int> ). */
2478 m = char_len_param_value (&len, &deferred);
2479 if (m == MATCH_NO)
2480 goto syntax;
2481 if (m == MATCH_ERROR)
2482 goto done;
2483 seen_length = 1;
2484
2485 m = gfc_match_char (')');
2486 if (m == MATCH_YES)
2487 goto done;
2488
2489 if (gfc_match_char (',') != MATCH_YES)
2490 goto syntax;
2491
2492 gfc_match (" kind ="); /* Gobble optional text. */
2493
2494 m = match_char_kind (&kind, &is_iso_c);
2495 if (m == MATCH_ERROR)
2496 goto done;
2497 if (m == MATCH_NO)
2498 goto syntax;
2499
2500 rparen:
2501 /* Require a right-paren at this point. */
2502 m = gfc_match_char (')');
2503 if (m == MATCH_YES)
2504 goto done;
2505
2506 syntax:
2507 gfc_error ("Syntax error in CHARACTER declaration at %C");
2508 m = MATCH_ERROR;
2509 gfc_free_expr (len);
2510 return m;
2511
2512 done:
2513 /* Deal with character functions after USE and IMPORT statements. */
2514 if (gfc_matching_function)
2515 {
2516 gfc_free_expr (len);
2517 gfc_undo_symbols ();
2518 return MATCH_YES;
2519 }
2520
2521 if (m != MATCH_YES)
2522 {
2523 gfc_free_expr (len);
2524 return m;
2525 }
2526
2527 /* Do some final massaging of the length values. */
2528 cl = gfc_new_charlen (gfc_current_ns, NULL);
2529
2530 if (seen_length == 0)
2531 cl->length = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
2532 else
2533 cl->length = len;
2534
2535 ts->u.cl = cl;
2536 ts->kind = kind == 0 ? gfc_default_character_kind : kind;
2537 ts->deferred = deferred;
2538
2539 /* We have to know if it was a C interoperable kind so we can
2540 do accurate type checking of bind(c) procs, etc. */
2541 if (kind != 0)
2542 /* Mark this as C interoperable if being declared with one
2543 of the named constants from iso_c_binding. */
2544 ts->is_c_interop = is_iso_c;
2545 else if (len != NULL)
2546 /* Here, we might have parsed something such as: character(c_char)
2547 In this case, the parsing code above grabs the c_char when
2548 looking for the length (line 1690, roughly). it's the last
2549 testcase for parsing the kind params of a character variable.
2550 However, it's not actually the length. this seems like it
2551 could be an error.
2552 To see if the user used a C interop kind, test the expr
2553 of the so called length, and see if it's C interoperable. */
2554 ts->is_c_interop = len->ts.is_iso_c;
2555
2556 return MATCH_YES;
2557 }
2558
2559
2560 /* Matches a declaration-type-spec (F03:R502). If successful, sets the ts
2561 structure to the matched specification. This is necessary for FUNCTION and
2562 IMPLICIT statements.
2563
2564 If implicit_flag is nonzero, then we don't check for the optional
2565 kind specification. Not doing so is needed for matching an IMPLICIT
2566 statement correctly. */
2567
2568 match
gfc_match_decl_type_spec(gfc_typespec * ts,int implicit_flag)2569 gfc_match_decl_type_spec (gfc_typespec *ts, int implicit_flag)
2570 {
2571 char name[GFC_MAX_SYMBOL_LEN + 1];
2572 gfc_symbol *sym, *dt_sym;
2573 match m;
2574 char c;
2575 bool seen_deferred_kind, matched_type;
2576 const char *dt_name;
2577
2578 /* A belt and braces check that the typespec is correctly being treated
2579 as a deferred characteristic association. */
2580 seen_deferred_kind = (gfc_current_state () == COMP_FUNCTION)
2581 && (gfc_current_block ()->result->ts.kind == -1)
2582 && (ts->kind == -1);
2583 gfc_clear_ts (ts);
2584 if (seen_deferred_kind)
2585 ts->kind = -1;
2586
2587 /* Clear the current binding label, in case one is given. */
2588 curr_binding_label = NULL;
2589
2590 if (gfc_match (" byte") == MATCH_YES)
2591 {
2592 if (gfc_notify_std (GFC_STD_GNU, "BYTE type at %C")
2593 == FAILURE)
2594 return MATCH_ERROR;
2595
2596 if (gfc_validate_kind (BT_INTEGER, 1, true) < 0)
2597 {
2598 gfc_error ("BYTE type used at %C "
2599 "is not available on the target machine");
2600 return MATCH_ERROR;
2601 }
2602
2603 ts->type = BT_INTEGER;
2604 ts->kind = 1;
2605 return MATCH_YES;
2606 }
2607
2608
2609 m = gfc_match (" type (");
2610 matched_type = (m == MATCH_YES);
2611 if (matched_type)
2612 {
2613 gfc_gobble_whitespace ();
2614 if (gfc_peek_ascii_char () == '*')
2615 {
2616 if ((m = gfc_match ("*)")) != MATCH_YES)
2617 return m;
2618 if (gfc_current_state () == COMP_DERIVED)
2619 {
2620 gfc_error ("Assumed type at %C is not allowed for components");
2621 return MATCH_ERROR;
2622 }
2623 if (gfc_notify_std (GFC_STD_F2008_TS, "Assumed type "
2624 "at %C") == FAILURE)
2625 return MATCH_ERROR;
2626 ts->type = BT_ASSUMED;
2627 return MATCH_YES;
2628 }
2629
2630 m = gfc_match ("%n", name);
2631 matched_type = (m == MATCH_YES);
2632 }
2633
2634 if ((matched_type && strcmp ("integer", name) == 0)
2635 || (!matched_type && gfc_match (" integer") == MATCH_YES))
2636 {
2637 ts->type = BT_INTEGER;
2638 ts->kind = gfc_default_integer_kind;
2639 goto get_kind;
2640 }
2641
2642 if ((matched_type && strcmp ("character", name) == 0)
2643 || (!matched_type && gfc_match (" character") == MATCH_YES))
2644 {
2645 if (matched_type
2646 && gfc_notify_std (GFC_STD_F2008, "TYPE with "
2647 "intrinsic-type-spec at %C") == FAILURE)
2648 return MATCH_ERROR;
2649
2650 ts->type = BT_CHARACTER;
2651 if (implicit_flag == 0)
2652 m = gfc_match_char_spec (ts);
2653 else
2654 m = MATCH_YES;
2655
2656 if (matched_type && m == MATCH_YES && gfc_match_char (')') != MATCH_YES)
2657 m = MATCH_ERROR;
2658
2659 return m;
2660 }
2661
2662 if ((matched_type && strcmp ("real", name) == 0)
2663 || (!matched_type && gfc_match (" real") == MATCH_YES))
2664 {
2665 ts->type = BT_REAL;
2666 ts->kind = gfc_default_real_kind;
2667 goto get_kind;
2668 }
2669
2670 if ((matched_type
2671 && (strcmp ("doubleprecision", name) == 0
2672 || (strcmp ("double", name) == 0
2673 && gfc_match (" precision") == MATCH_YES)))
2674 || (!matched_type && gfc_match (" double precision") == MATCH_YES))
2675 {
2676 if (matched_type
2677 && gfc_notify_std (GFC_STD_F2008, "TYPE with "
2678 "intrinsic-type-spec at %C") == FAILURE)
2679 return MATCH_ERROR;
2680 if (matched_type && gfc_match_char (')') != MATCH_YES)
2681 return MATCH_ERROR;
2682
2683 ts->type = BT_REAL;
2684 ts->kind = gfc_default_double_kind;
2685 return MATCH_YES;
2686 }
2687
2688 if ((matched_type && strcmp ("complex", name) == 0)
2689 || (!matched_type && gfc_match (" complex") == MATCH_YES))
2690 {
2691 ts->type = BT_COMPLEX;
2692 ts->kind = gfc_default_complex_kind;
2693 goto get_kind;
2694 }
2695
2696 if ((matched_type
2697 && (strcmp ("doublecomplex", name) == 0
2698 || (strcmp ("double", name) == 0
2699 && gfc_match (" complex") == MATCH_YES)))
2700 || (!matched_type && gfc_match (" double complex") == MATCH_YES))
2701 {
2702 if (gfc_notify_std (GFC_STD_GNU, "DOUBLE COMPLEX at %C")
2703 == FAILURE)
2704 return MATCH_ERROR;
2705
2706 if (matched_type
2707 && gfc_notify_std (GFC_STD_F2008, "TYPE with "
2708 "intrinsic-type-spec at %C") == FAILURE)
2709 return MATCH_ERROR;
2710
2711 if (matched_type && gfc_match_char (')') != MATCH_YES)
2712 return MATCH_ERROR;
2713
2714 ts->type = BT_COMPLEX;
2715 ts->kind = gfc_default_double_kind;
2716 return MATCH_YES;
2717 }
2718
2719 if ((matched_type && strcmp ("logical", name) == 0)
2720 || (!matched_type && gfc_match (" logical") == MATCH_YES))
2721 {
2722 ts->type = BT_LOGICAL;
2723 ts->kind = gfc_default_logical_kind;
2724 goto get_kind;
2725 }
2726
2727 if (matched_type)
2728 m = gfc_match_char (')');
2729
2730 if (m == MATCH_YES)
2731 ts->type = BT_DERIVED;
2732 else
2733 {
2734 /* Match CLASS declarations. */
2735 m = gfc_match (" class ( * )");
2736 if (m == MATCH_ERROR)
2737 return MATCH_ERROR;
2738 else if (m == MATCH_YES)
2739 {
2740 gfc_symbol *upe;
2741 gfc_symtree *st;
2742 ts->type = BT_CLASS;
2743 gfc_find_symbol ("STAR", gfc_current_ns, 1, &upe);
2744 if (upe == NULL)
2745 {
2746 upe = gfc_new_symbol ("STAR", gfc_current_ns);
2747 st = gfc_new_symtree (&gfc_current_ns->sym_root, "STAR");
2748 st->n.sym = upe;
2749 gfc_set_sym_referenced (upe);
2750 upe->refs++;
2751 upe->ts.type = BT_VOID;
2752 upe->attr.unlimited_polymorphic = 1;
2753 /* This is essential to force the construction of
2754 unlimited polymorphic component class containers. */
2755 upe->attr.zero_comp = 1;
2756 if (gfc_add_flavor (&upe->attr, FL_DERIVED,
2757 NULL, &gfc_current_locus) == FAILURE)
2758 return MATCH_ERROR;
2759 }
2760 else
2761 {
2762 st = gfc_find_symtree (gfc_current_ns->sym_root, "STAR");
2763 if (st == NULL)
2764 st = gfc_new_symtree (&gfc_current_ns->sym_root, "STAR");
2765 st->n.sym = upe;
2766 upe->refs++;
2767 }
2768 ts->u.derived = upe;
2769 return m;
2770 }
2771
2772 m = gfc_match (" class ( %n )", name);
2773 if (m != MATCH_YES)
2774 return m;
2775 ts->type = BT_CLASS;
2776
2777 if (gfc_notify_std (GFC_STD_F2003, "CLASS statement at %C")
2778 == FAILURE)
2779 return MATCH_ERROR;
2780 }
2781
2782 /* Defer association of the derived type until the end of the
2783 specification block. However, if the derived type can be
2784 found, add it to the typespec. */
2785 if (gfc_matching_function)
2786 {
2787 ts->u.derived = NULL;
2788 if (gfc_current_state () != COMP_INTERFACE
2789 && !gfc_find_symbol (name, NULL, 1, &sym) && sym)
2790 {
2791 sym = gfc_find_dt_in_generic (sym);
2792 ts->u.derived = sym;
2793 }
2794 return MATCH_YES;
2795 }
2796
2797 /* Search for the name but allow the components to be defined later. If
2798 type = -1, this typespec has been seen in a function declaration but
2799 the type could not be accessed at that point. The actual derived type is
2800 stored in a symtree with the first letter of the name capitalized; the
2801 symtree with the all lower-case name contains the associated
2802 generic function. */
2803 dt_name = gfc_get_string ("%c%s",
2804 (char) TOUPPER ((unsigned char) name[0]),
2805 (const char*)&name[1]);
2806 sym = NULL;
2807 dt_sym = NULL;
2808 if (ts->kind != -1)
2809 {
2810 gfc_get_ha_symbol (name, &sym);
2811 if (sym->generic && gfc_find_symbol (dt_name, NULL, 0, &dt_sym))
2812 {
2813 gfc_error ("Type name '%s' at %C is ambiguous", name);
2814 return MATCH_ERROR;
2815 }
2816 if (sym->generic && !dt_sym)
2817 dt_sym = gfc_find_dt_in_generic (sym);
2818 }
2819 else if (ts->kind == -1)
2820 {
2821 int iface = gfc_state_stack->previous->state != COMP_INTERFACE
2822 || gfc_current_ns->has_import_set;
2823 gfc_find_symbol (name, NULL, iface, &sym);
2824 if (sym && sym->generic && gfc_find_symbol (dt_name, NULL, 1, &dt_sym))
2825 {
2826 gfc_error ("Type name '%s' at %C is ambiguous", name);
2827 return MATCH_ERROR;
2828 }
2829 if (sym && sym->generic && !dt_sym)
2830 dt_sym = gfc_find_dt_in_generic (sym);
2831
2832 ts->kind = 0;
2833 if (sym == NULL)
2834 return MATCH_NO;
2835 }
2836
2837 if ((sym->attr.flavor != FL_UNKNOWN
2838 && !(sym->attr.flavor == FL_PROCEDURE && sym->attr.generic))
2839 || sym->attr.subroutine)
2840 {
2841 gfc_error ("Type name '%s' at %C conflicts with previously declared "
2842 "entity at %L, which has the same name", name,
2843 &sym->declared_at);
2844 return MATCH_ERROR;
2845 }
2846
2847 gfc_set_sym_referenced (sym);
2848 if (!sym->attr.generic
2849 && gfc_add_generic (&sym->attr, sym->name, NULL) == FAILURE)
2850 return MATCH_ERROR;
2851
2852 if (!sym->attr.function
2853 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2854 return MATCH_ERROR;
2855
2856 if (!dt_sym)
2857 {
2858 gfc_interface *intr, *head;
2859
2860 /* Use upper case to save the actual derived-type symbol. */
2861 gfc_get_symbol (dt_name, NULL, &dt_sym);
2862 dt_sym->name = gfc_get_string (sym->name);
2863 head = sym->generic;
2864 intr = gfc_get_interface ();
2865 intr->sym = dt_sym;
2866 intr->where = gfc_current_locus;
2867 intr->next = head;
2868 sym->generic = intr;
2869 sym->attr.if_source = IFSRC_DECL;
2870 }
2871
2872 gfc_set_sym_referenced (dt_sym);
2873
2874 if (dt_sym->attr.flavor != FL_DERIVED
2875 && gfc_add_flavor (&dt_sym->attr, FL_DERIVED, sym->name, NULL)
2876 == FAILURE)
2877 return MATCH_ERROR;
2878
2879 ts->u.derived = dt_sym;
2880
2881 return MATCH_YES;
2882
2883 get_kind:
2884 if (matched_type
2885 && gfc_notify_std (GFC_STD_F2008, "TYPE with "
2886 "intrinsic-type-spec at %C") == FAILURE)
2887 return MATCH_ERROR;
2888
2889 /* For all types except double, derived and character, look for an
2890 optional kind specifier. MATCH_NO is actually OK at this point. */
2891 if (implicit_flag == 1)
2892 {
2893 if (matched_type && gfc_match_char (')') != MATCH_YES)
2894 return MATCH_ERROR;
2895
2896 return MATCH_YES;
2897 }
2898
2899 if (gfc_current_form == FORM_FREE)
2900 {
2901 c = gfc_peek_ascii_char ();
2902 if (!gfc_is_whitespace (c) && c != '*' && c != '('
2903 && c != ':' && c != ',')
2904 {
2905 if (matched_type && c == ')')
2906 {
2907 gfc_next_ascii_char ();
2908 return MATCH_YES;
2909 }
2910 return MATCH_NO;
2911 }
2912 }
2913
2914 m = gfc_match_kind_spec (ts, false);
2915 if (m == MATCH_NO && ts->type != BT_CHARACTER)
2916 m = gfc_match_old_kind_spec (ts);
2917
2918 if (matched_type && gfc_match_char (')') != MATCH_YES)
2919 return MATCH_ERROR;
2920
2921 /* Defer association of the KIND expression of function results
2922 until after USE and IMPORT statements. */
2923 if ((gfc_current_state () == COMP_NONE && gfc_error_flag_test ())
2924 || gfc_matching_function)
2925 return MATCH_YES;
2926
2927 if (m == MATCH_NO)
2928 m = MATCH_YES; /* No kind specifier found. */
2929
2930 return m;
2931 }
2932
2933
2934 /* Match an IMPLICIT NONE statement. Actually, this statement is
2935 already matched in parse.c, or we would not end up here in the
2936 first place. So the only thing we need to check, is if there is
2937 trailing garbage. If not, the match is successful. */
2938
2939 match
gfc_match_implicit_none(void)2940 gfc_match_implicit_none (void)
2941 {
2942 return (gfc_match_eos () == MATCH_YES) ? MATCH_YES : MATCH_NO;
2943 }
2944
2945
2946 /* Match the letter range(s) of an IMPLICIT statement. */
2947
2948 static match
match_implicit_range(void)2949 match_implicit_range (void)
2950 {
2951 char c, c1, c2;
2952 int inner;
2953 locus cur_loc;
2954
2955 cur_loc = gfc_current_locus;
2956
2957 gfc_gobble_whitespace ();
2958 c = gfc_next_ascii_char ();
2959 if (c != '(')
2960 {
2961 gfc_error ("Missing character range in IMPLICIT at %C");
2962 goto bad;
2963 }
2964
2965 inner = 1;
2966 while (inner)
2967 {
2968 gfc_gobble_whitespace ();
2969 c1 = gfc_next_ascii_char ();
2970 if (!ISALPHA (c1))
2971 goto bad;
2972
2973 gfc_gobble_whitespace ();
2974 c = gfc_next_ascii_char ();
2975
2976 switch (c)
2977 {
2978 case ')':
2979 inner = 0; /* Fall through. */
2980
2981 case ',':
2982 c2 = c1;
2983 break;
2984
2985 case '-':
2986 gfc_gobble_whitespace ();
2987 c2 = gfc_next_ascii_char ();
2988 if (!ISALPHA (c2))
2989 goto bad;
2990
2991 gfc_gobble_whitespace ();
2992 c = gfc_next_ascii_char ();
2993
2994 if ((c != ',') && (c != ')'))
2995 goto bad;
2996 if (c == ')')
2997 inner = 0;
2998
2999 break;
3000
3001 default:
3002 goto bad;
3003 }
3004
3005 if (c1 > c2)
3006 {
3007 gfc_error ("Letters must be in alphabetic order in "
3008 "IMPLICIT statement at %C");
3009 goto bad;
3010 }
3011
3012 /* See if we can add the newly matched range to the pending
3013 implicits from this IMPLICIT statement. We do not check for
3014 conflicts with whatever earlier IMPLICIT statements may have
3015 set. This is done when we've successfully finished matching
3016 the current one. */
3017 if (gfc_add_new_implicit_range (c1, c2) != SUCCESS)
3018 goto bad;
3019 }
3020
3021 return MATCH_YES;
3022
3023 bad:
3024 gfc_syntax_error (ST_IMPLICIT);
3025
3026 gfc_current_locus = cur_loc;
3027 return MATCH_ERROR;
3028 }
3029
3030
3031 /* Match an IMPLICIT statement, storing the types for
3032 gfc_set_implicit() if the statement is accepted by the parser.
3033 There is a strange looking, but legal syntactic construction
3034 possible. It looks like:
3035
3036 IMPLICIT INTEGER (a-b) (c-d)
3037
3038 This is legal if "a-b" is a constant expression that happens to
3039 equal one of the legal kinds for integers. The real problem
3040 happens with an implicit specification that looks like:
3041
3042 IMPLICIT INTEGER (a-b)
3043
3044 In this case, a typespec matcher that is "greedy" (as most of the
3045 matchers are) gobbles the character range as a kindspec, leaving
3046 nothing left. We therefore have to go a bit more slowly in the
3047 matching process by inhibiting the kindspec checking during
3048 typespec matching and checking for a kind later. */
3049
3050 match
gfc_match_implicit(void)3051 gfc_match_implicit (void)
3052 {
3053 gfc_typespec ts;
3054 locus cur_loc;
3055 char c;
3056 match m;
3057
3058 gfc_clear_ts (&ts);
3059
3060 /* We don't allow empty implicit statements. */
3061 if (gfc_match_eos () == MATCH_YES)
3062 {
3063 gfc_error ("Empty IMPLICIT statement at %C");
3064 return MATCH_ERROR;
3065 }
3066
3067 do
3068 {
3069 /* First cleanup. */
3070 gfc_clear_new_implicit ();
3071
3072 /* A basic type is mandatory here. */
3073 m = gfc_match_decl_type_spec (&ts, 1);
3074 if (m == MATCH_ERROR)
3075 goto error;
3076 if (m == MATCH_NO)
3077 goto syntax;
3078
3079 cur_loc = gfc_current_locus;
3080 m = match_implicit_range ();
3081
3082 if (m == MATCH_YES)
3083 {
3084 /* We may have <TYPE> (<RANGE>). */
3085 gfc_gobble_whitespace ();
3086 c = gfc_next_ascii_char ();
3087 if ((c == '\n') || (c == ','))
3088 {
3089 /* Check for CHARACTER with no length parameter. */
3090 if (ts.type == BT_CHARACTER && !ts.u.cl)
3091 {
3092 ts.kind = gfc_default_character_kind;
3093 ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
3094 ts.u.cl->length = gfc_get_int_expr (gfc_default_integer_kind,
3095 NULL, 1);
3096 }
3097
3098 /* Record the Successful match. */
3099 if (gfc_merge_new_implicit (&ts) != SUCCESS)
3100 return MATCH_ERROR;
3101 continue;
3102 }
3103
3104 gfc_current_locus = cur_loc;
3105 }
3106
3107 /* Discard the (incorrectly) matched range. */
3108 gfc_clear_new_implicit ();
3109
3110 /* Last chance -- check <TYPE> <SELECTOR> (<RANGE>). */
3111 if (ts.type == BT_CHARACTER)
3112 m = gfc_match_char_spec (&ts);
3113 else
3114 {
3115 m = gfc_match_kind_spec (&ts, false);
3116 if (m == MATCH_NO)
3117 {
3118 m = gfc_match_old_kind_spec (&ts);
3119 if (m == MATCH_ERROR)
3120 goto error;
3121 if (m == MATCH_NO)
3122 goto syntax;
3123 }
3124 }
3125 if (m == MATCH_ERROR)
3126 goto error;
3127
3128 m = match_implicit_range ();
3129 if (m == MATCH_ERROR)
3130 goto error;
3131 if (m == MATCH_NO)
3132 goto syntax;
3133
3134 gfc_gobble_whitespace ();
3135 c = gfc_next_ascii_char ();
3136 if ((c != '\n') && (c != ','))
3137 goto syntax;
3138
3139 if (gfc_merge_new_implicit (&ts) != SUCCESS)
3140 return MATCH_ERROR;
3141 }
3142 while (c == ',');
3143
3144 return MATCH_YES;
3145
3146 syntax:
3147 gfc_syntax_error (ST_IMPLICIT);
3148
3149 error:
3150 return MATCH_ERROR;
3151 }
3152
3153
3154 match
gfc_match_import(void)3155 gfc_match_import (void)
3156 {
3157 char name[GFC_MAX_SYMBOL_LEN + 1];
3158 match m;
3159 gfc_symbol *sym;
3160 gfc_symtree *st;
3161
3162 if (gfc_current_ns->proc_name == NULL
3163 || gfc_current_ns->proc_name->attr.if_source != IFSRC_IFBODY)
3164 {
3165 gfc_error ("IMPORT statement at %C only permitted in "
3166 "an INTERFACE body");
3167 return MATCH_ERROR;
3168 }
3169
3170 if (gfc_notify_std (GFC_STD_F2003, "IMPORT statement at %C")
3171 == FAILURE)
3172 return MATCH_ERROR;
3173
3174 if (gfc_match_eos () == MATCH_YES)
3175 {
3176 /* All host variables should be imported. */
3177 gfc_current_ns->has_import_set = 1;
3178 return MATCH_YES;
3179 }
3180
3181 if (gfc_match (" ::") == MATCH_YES)
3182 {
3183 if (gfc_match_eos () == MATCH_YES)
3184 {
3185 gfc_error ("Expecting list of named entities at %C");
3186 return MATCH_ERROR;
3187 }
3188 }
3189
3190 for(;;)
3191 {
3192 sym = NULL;
3193 m = gfc_match (" %n", name);
3194 switch (m)
3195 {
3196 case MATCH_YES:
3197 if (gfc_current_ns->parent != NULL
3198 && gfc_find_symbol (name, gfc_current_ns->parent, 1, &sym))
3199 {
3200 gfc_error ("Type name '%s' at %C is ambiguous", name);
3201 return MATCH_ERROR;
3202 }
3203 else if (!sym && gfc_current_ns->proc_name->ns->parent != NULL
3204 && gfc_find_symbol (name,
3205 gfc_current_ns->proc_name->ns->parent,
3206 1, &sym))
3207 {
3208 gfc_error ("Type name '%s' at %C is ambiguous", name);
3209 return MATCH_ERROR;
3210 }
3211
3212 if (sym == NULL)
3213 {
3214 gfc_error ("Cannot IMPORT '%s' from host scoping unit "
3215 "at %C - does not exist.", name);
3216 return MATCH_ERROR;
3217 }
3218
3219 if (gfc_find_symtree (gfc_current_ns->sym_root, name))
3220 {
3221 gfc_warning ("'%s' is already IMPORTed from host scoping unit "
3222 "at %C.", name);
3223 goto next_item;
3224 }
3225
3226 st = gfc_new_symtree (&gfc_current_ns->sym_root, name);
3227 st->n.sym = sym;
3228 sym->refs++;
3229 sym->attr.imported = 1;
3230
3231 if (sym->attr.generic && (sym = gfc_find_dt_in_generic (sym)))
3232 {
3233 /* The actual derived type is stored in a symtree with the first
3234 letter of the name capitalized; the symtree with the all
3235 lower-case name contains the associated generic function. */
3236 st = gfc_new_symtree (&gfc_current_ns->sym_root,
3237 gfc_get_string ("%c%s",
3238 (char) TOUPPER ((unsigned char) name[0]),
3239 &name[1]));
3240 st->n.sym = sym;
3241 sym->refs++;
3242 sym->attr.imported = 1;
3243 }
3244
3245 goto next_item;
3246
3247 case MATCH_NO:
3248 break;
3249
3250 case MATCH_ERROR:
3251 return MATCH_ERROR;
3252 }
3253
3254 next_item:
3255 if (gfc_match_eos () == MATCH_YES)
3256 break;
3257 if (gfc_match_char (',') != MATCH_YES)
3258 goto syntax;
3259 }
3260
3261 return MATCH_YES;
3262
3263 syntax:
3264 gfc_error ("Syntax error in IMPORT statement at %C");
3265 return MATCH_ERROR;
3266 }
3267
3268
3269 /* A minimal implementation of gfc_match without whitespace, escape
3270 characters or variable arguments. Returns true if the next
3271 characters match the TARGET template exactly. */
3272
3273 static bool
match_string_p(const char * target)3274 match_string_p (const char *target)
3275 {
3276 const char *p;
3277
3278 for (p = target; *p; p++)
3279 if ((char) gfc_next_ascii_char () != *p)
3280 return false;
3281 return true;
3282 }
3283
3284 /* Matches an attribute specification including array specs. If
3285 successful, leaves the variables current_attr and current_as
3286 holding the specification. Also sets the colon_seen variable for
3287 later use by matchers associated with initializations.
3288
3289 This subroutine is a little tricky in the sense that we don't know
3290 if we really have an attr-spec until we hit the double colon.
3291 Until that time, we can only return MATCH_NO. This forces us to
3292 check for duplicate specification at this level. */
3293
3294 static match
match_attr_spec(void)3295 match_attr_spec (void)
3296 {
3297 /* Modifiers that can exist in a type statement. */
3298 enum
3299 { GFC_DECL_BEGIN = 0,
3300 DECL_ALLOCATABLE = GFC_DECL_BEGIN, DECL_DIMENSION, DECL_EXTERNAL,
3301 DECL_IN, DECL_OUT, DECL_INOUT, DECL_INTRINSIC, DECL_OPTIONAL,
3302 DECL_PARAMETER, DECL_POINTER, DECL_PROTECTED, DECL_PRIVATE,
3303 DECL_PUBLIC, DECL_SAVE, DECL_TARGET, DECL_VALUE, DECL_VOLATILE,
3304 DECL_IS_BIND_C, DECL_CODIMENSION, DECL_ASYNCHRONOUS, DECL_CONTIGUOUS,
3305 DECL_NONE, GFC_DECL_END /* Sentinel */
3306 };
3307
3308 /* GFC_DECL_END is the sentinel, index starts at 0. */
3309 #define NUM_DECL GFC_DECL_END
3310
3311 locus start, seen_at[NUM_DECL];
3312 int seen[NUM_DECL];
3313 unsigned int d;
3314 const char *attr;
3315 match m;
3316 gfc_try t;
3317
3318 gfc_clear_attr (¤t_attr);
3319 start = gfc_current_locus;
3320
3321 current_as = NULL;
3322 colon_seen = 0;
3323
3324 /* See if we get all of the keywords up to the final double colon. */
3325 for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++)
3326 seen[d] = 0;
3327
3328 for (;;)
3329 {
3330 char ch;
3331
3332 d = DECL_NONE;
3333 gfc_gobble_whitespace ();
3334
3335 ch = gfc_next_ascii_char ();
3336 if (ch == ':')
3337 {
3338 /* This is the successful exit condition for the loop. */
3339 if (gfc_next_ascii_char () == ':')
3340 break;
3341 }
3342 else if (ch == ',')
3343 {
3344 gfc_gobble_whitespace ();
3345 switch (gfc_peek_ascii_char ())
3346 {
3347 case 'a':
3348 gfc_next_ascii_char ();
3349 switch (gfc_next_ascii_char ())
3350 {
3351 case 'l':
3352 if (match_string_p ("locatable"))
3353 {
3354 /* Matched "allocatable". */
3355 d = DECL_ALLOCATABLE;
3356 }
3357 break;
3358
3359 case 's':
3360 if (match_string_p ("ynchronous"))
3361 {
3362 /* Matched "asynchronous". */
3363 d = DECL_ASYNCHRONOUS;
3364 }
3365 break;
3366 }
3367 break;
3368
3369 case 'b':
3370 /* Try and match the bind(c). */
3371 m = gfc_match_bind_c (NULL, true);
3372 if (m == MATCH_YES)
3373 d = DECL_IS_BIND_C;
3374 else if (m == MATCH_ERROR)
3375 goto cleanup;
3376 break;
3377
3378 case 'c':
3379 gfc_next_ascii_char ();
3380 if ('o' != gfc_next_ascii_char ())
3381 break;
3382 switch (gfc_next_ascii_char ())
3383 {
3384 case 'd':
3385 if (match_string_p ("imension"))
3386 {
3387 d = DECL_CODIMENSION;
3388 break;
3389 }
3390 case 'n':
3391 if (match_string_p ("tiguous"))
3392 {
3393 d = DECL_CONTIGUOUS;
3394 break;
3395 }
3396 }
3397 break;
3398
3399 case 'd':
3400 if (match_string_p ("dimension"))
3401 d = DECL_DIMENSION;
3402 break;
3403
3404 case 'e':
3405 if (match_string_p ("external"))
3406 d = DECL_EXTERNAL;
3407 break;
3408
3409 case 'i':
3410 if (match_string_p ("int"))
3411 {
3412 ch = gfc_next_ascii_char ();
3413 if (ch == 'e')
3414 {
3415 if (match_string_p ("nt"))
3416 {
3417 /* Matched "intent". */
3418 /* TODO: Call match_intent_spec from here. */
3419 if (gfc_match (" ( in out )") == MATCH_YES)
3420 d = DECL_INOUT;
3421 else if (gfc_match (" ( in )") == MATCH_YES)
3422 d = DECL_IN;
3423 else if (gfc_match (" ( out )") == MATCH_YES)
3424 d = DECL_OUT;
3425 }
3426 }
3427 else if (ch == 'r')
3428 {
3429 if (match_string_p ("insic"))
3430 {
3431 /* Matched "intrinsic". */
3432 d = DECL_INTRINSIC;
3433 }
3434 }
3435 }
3436 break;
3437
3438 case 'o':
3439 if (match_string_p ("optional"))
3440 d = DECL_OPTIONAL;
3441 break;
3442
3443 case 'p':
3444 gfc_next_ascii_char ();
3445 switch (gfc_next_ascii_char ())
3446 {
3447 case 'a':
3448 if (match_string_p ("rameter"))
3449 {
3450 /* Matched "parameter". */
3451 d = DECL_PARAMETER;
3452 }
3453 break;
3454
3455 case 'o':
3456 if (match_string_p ("inter"))
3457 {
3458 /* Matched "pointer". */
3459 d = DECL_POINTER;
3460 }
3461 break;
3462
3463 case 'r':
3464 ch = gfc_next_ascii_char ();
3465 if (ch == 'i')
3466 {
3467 if (match_string_p ("vate"))
3468 {
3469 /* Matched "private". */
3470 d = DECL_PRIVATE;
3471 }
3472 }
3473 else if (ch == 'o')
3474 {
3475 if (match_string_p ("tected"))
3476 {
3477 /* Matched "protected". */
3478 d = DECL_PROTECTED;
3479 }
3480 }
3481 break;
3482
3483 case 'u':
3484 if (match_string_p ("blic"))
3485 {
3486 /* Matched "public". */
3487 d = DECL_PUBLIC;
3488 }
3489 break;
3490 }
3491 break;
3492
3493 case 's':
3494 if (match_string_p ("save"))
3495 d = DECL_SAVE;
3496 break;
3497
3498 case 't':
3499 if (match_string_p ("target"))
3500 d = DECL_TARGET;
3501 break;
3502
3503 case 'v':
3504 gfc_next_ascii_char ();
3505 ch = gfc_next_ascii_char ();
3506 if (ch == 'a')
3507 {
3508 if (match_string_p ("lue"))
3509 {
3510 /* Matched "value". */
3511 d = DECL_VALUE;
3512 }
3513 }
3514 else if (ch == 'o')
3515 {
3516 if (match_string_p ("latile"))
3517 {
3518 /* Matched "volatile". */
3519 d = DECL_VOLATILE;
3520 }
3521 }
3522 break;
3523 }
3524 }
3525
3526 /* No double colon and no recognizable decl_type, so assume that
3527 we've been looking at something else the whole time. */
3528 if (d == DECL_NONE)
3529 {
3530 m = MATCH_NO;
3531 goto cleanup;
3532 }
3533
3534 /* Check to make sure any parens are paired up correctly. */
3535 if (gfc_match_parens () == MATCH_ERROR)
3536 {
3537 m = MATCH_ERROR;
3538 goto cleanup;
3539 }
3540
3541 seen[d]++;
3542 seen_at[d] = gfc_current_locus;
3543
3544 if (d == DECL_DIMENSION || d == DECL_CODIMENSION)
3545 {
3546 gfc_array_spec *as = NULL;
3547
3548 m = gfc_match_array_spec (&as, d == DECL_DIMENSION,
3549 d == DECL_CODIMENSION);
3550
3551 if (current_as == NULL)
3552 current_as = as;
3553 else if (m == MATCH_YES)
3554 {
3555 if (merge_array_spec (as, current_as, false) == FAILURE)
3556 m = MATCH_ERROR;
3557 free (as);
3558 }
3559
3560 if (m == MATCH_NO)
3561 {
3562 if (d == DECL_CODIMENSION)
3563 gfc_error ("Missing codimension specification at %C");
3564 else
3565 gfc_error ("Missing dimension specification at %C");
3566 m = MATCH_ERROR;
3567 }
3568
3569 if (m == MATCH_ERROR)
3570 goto cleanup;
3571 }
3572 }
3573
3574 /* Since we've seen a double colon, we have to be looking at an
3575 attr-spec. This means that we can now issue errors. */
3576 for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++)
3577 if (seen[d] > 1)
3578 {
3579 switch (d)
3580 {
3581 case DECL_ALLOCATABLE:
3582 attr = "ALLOCATABLE";
3583 break;
3584 case DECL_ASYNCHRONOUS:
3585 attr = "ASYNCHRONOUS";
3586 break;
3587 case DECL_CODIMENSION:
3588 attr = "CODIMENSION";
3589 break;
3590 case DECL_CONTIGUOUS:
3591 attr = "CONTIGUOUS";
3592 break;
3593 case DECL_DIMENSION:
3594 attr = "DIMENSION";
3595 break;
3596 case DECL_EXTERNAL:
3597 attr = "EXTERNAL";
3598 break;
3599 case DECL_IN:
3600 attr = "INTENT (IN)";
3601 break;
3602 case DECL_OUT:
3603 attr = "INTENT (OUT)";
3604 break;
3605 case DECL_INOUT:
3606 attr = "INTENT (IN OUT)";
3607 break;
3608 case DECL_INTRINSIC:
3609 attr = "INTRINSIC";
3610 break;
3611 case DECL_OPTIONAL:
3612 attr = "OPTIONAL";
3613 break;
3614 case DECL_PARAMETER:
3615 attr = "PARAMETER";
3616 break;
3617 case DECL_POINTER:
3618 attr = "POINTER";
3619 break;
3620 case DECL_PROTECTED:
3621 attr = "PROTECTED";
3622 break;
3623 case DECL_PRIVATE:
3624 attr = "PRIVATE";
3625 break;
3626 case DECL_PUBLIC:
3627 attr = "PUBLIC";
3628 break;
3629 case DECL_SAVE:
3630 attr = "SAVE";
3631 break;
3632 case DECL_TARGET:
3633 attr = "TARGET";
3634 break;
3635 case DECL_IS_BIND_C:
3636 attr = "IS_BIND_C";
3637 break;
3638 case DECL_VALUE:
3639 attr = "VALUE";
3640 break;
3641 case DECL_VOLATILE:
3642 attr = "VOLATILE";
3643 break;
3644 default:
3645 attr = NULL; /* This shouldn't happen. */
3646 }
3647
3648 gfc_error ("Duplicate %s attribute at %L", attr, &seen_at[d]);
3649 m = MATCH_ERROR;
3650 goto cleanup;
3651 }
3652
3653 /* Now that we've dealt with duplicate attributes, add the attributes
3654 to the current attribute. */
3655 for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++)
3656 {
3657 if (seen[d] == 0)
3658 continue;
3659
3660 if (gfc_current_state () == COMP_DERIVED
3661 && d != DECL_DIMENSION && d != DECL_CODIMENSION
3662 && d != DECL_POINTER && d != DECL_PRIVATE
3663 && d != DECL_PUBLIC && d != DECL_CONTIGUOUS && d != DECL_NONE)
3664 {
3665 if (d == DECL_ALLOCATABLE)
3666 {
3667 if (gfc_notify_std (GFC_STD_F2003, "ALLOCATABLE "
3668 "attribute at %C in a TYPE definition")
3669 == FAILURE)
3670 {
3671 m = MATCH_ERROR;
3672 goto cleanup;
3673 }
3674 }
3675 else
3676 {
3677 gfc_error ("Attribute at %L is not allowed in a TYPE definition",
3678 &seen_at[d]);
3679 m = MATCH_ERROR;
3680 goto cleanup;
3681 }
3682 }
3683
3684 if ((d == DECL_PRIVATE || d == DECL_PUBLIC)
3685 && gfc_current_state () != COMP_MODULE)
3686 {
3687 if (d == DECL_PRIVATE)
3688 attr = "PRIVATE";
3689 else
3690 attr = "PUBLIC";
3691 if (gfc_current_state () == COMP_DERIVED
3692 && gfc_state_stack->previous
3693 && gfc_state_stack->previous->state == COMP_MODULE)
3694 {
3695 if (gfc_notify_std (GFC_STD_F2003, "Attribute %s "
3696 "at %L in a TYPE definition", attr,
3697 &seen_at[d])
3698 == FAILURE)
3699 {
3700 m = MATCH_ERROR;
3701 goto cleanup;
3702 }
3703 }
3704 else
3705 {
3706 gfc_error ("%s attribute at %L is not allowed outside of the "
3707 "specification part of a module", attr, &seen_at[d]);
3708 m = MATCH_ERROR;
3709 goto cleanup;
3710 }
3711 }
3712
3713 switch (d)
3714 {
3715 case DECL_ALLOCATABLE:
3716 t = gfc_add_allocatable (¤t_attr, &seen_at[d]);
3717 break;
3718
3719 case DECL_ASYNCHRONOUS:
3720 if (gfc_notify_std (GFC_STD_F2003,
3721 "ASYNCHRONOUS attribute at %C")
3722 == FAILURE)
3723 t = FAILURE;
3724 else
3725 t = gfc_add_asynchronous (¤t_attr, NULL, &seen_at[d]);
3726 break;
3727
3728 case DECL_CODIMENSION:
3729 t = gfc_add_codimension (¤t_attr, NULL, &seen_at[d]);
3730 break;
3731
3732 case DECL_CONTIGUOUS:
3733 if (gfc_notify_std (GFC_STD_F2008,
3734 "CONTIGUOUS attribute at %C")
3735 == FAILURE)
3736 t = FAILURE;
3737 else
3738 t = gfc_add_contiguous (¤t_attr, NULL, &seen_at[d]);
3739 break;
3740
3741 case DECL_DIMENSION:
3742 t = gfc_add_dimension (¤t_attr, NULL, &seen_at[d]);
3743 break;
3744
3745 case DECL_EXTERNAL:
3746 t = gfc_add_external (¤t_attr, &seen_at[d]);
3747 break;
3748
3749 case DECL_IN:
3750 t = gfc_add_intent (¤t_attr, INTENT_IN, &seen_at[d]);
3751 break;
3752
3753 case DECL_OUT:
3754 t = gfc_add_intent (¤t_attr, INTENT_OUT, &seen_at[d]);
3755 break;
3756
3757 case DECL_INOUT:
3758 t = gfc_add_intent (¤t_attr, INTENT_INOUT, &seen_at[d]);
3759 break;
3760
3761 case DECL_INTRINSIC:
3762 t = gfc_add_intrinsic (¤t_attr, &seen_at[d]);
3763 break;
3764
3765 case DECL_OPTIONAL:
3766 t = gfc_add_optional (¤t_attr, &seen_at[d]);
3767 break;
3768
3769 case DECL_PARAMETER:
3770 t = gfc_add_flavor (¤t_attr, FL_PARAMETER, NULL, &seen_at[d]);
3771 break;
3772
3773 case DECL_POINTER:
3774 t = gfc_add_pointer (¤t_attr, &seen_at[d]);
3775 break;
3776
3777 case DECL_PROTECTED:
3778 if (gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
3779 {
3780 gfc_error ("PROTECTED at %C only allowed in specification "
3781 "part of a module");
3782 t = FAILURE;
3783 break;
3784 }
3785
3786 if (gfc_notify_std (GFC_STD_F2003, "PROTECTED "
3787 "attribute at %C")
3788 == FAILURE)
3789 t = FAILURE;
3790 else
3791 t = gfc_add_protected (¤t_attr, NULL, &seen_at[d]);
3792 break;
3793
3794 case DECL_PRIVATE:
3795 t = gfc_add_access (¤t_attr, ACCESS_PRIVATE, NULL,
3796 &seen_at[d]);
3797 break;
3798
3799 case DECL_PUBLIC:
3800 t = gfc_add_access (¤t_attr, ACCESS_PUBLIC, NULL,
3801 &seen_at[d]);
3802 break;
3803
3804 case DECL_SAVE:
3805 t = gfc_add_save (¤t_attr, SAVE_EXPLICIT, NULL, &seen_at[d]);
3806 break;
3807
3808 case DECL_TARGET:
3809 t = gfc_add_target (¤t_attr, &seen_at[d]);
3810 break;
3811
3812 case DECL_IS_BIND_C:
3813 t = gfc_add_is_bind_c(¤t_attr, NULL, &seen_at[d], 0);
3814 break;
3815
3816 case DECL_VALUE:
3817 if (gfc_notify_std (GFC_STD_F2003, "VALUE attribute "
3818 "at %C")
3819 == FAILURE)
3820 t = FAILURE;
3821 else
3822 t = gfc_add_value (¤t_attr, NULL, &seen_at[d]);
3823 break;
3824
3825 case DECL_VOLATILE:
3826 if (gfc_notify_std (GFC_STD_F2003,
3827 "VOLATILE attribute at %C")
3828 == FAILURE)
3829 t = FAILURE;
3830 else
3831 t = gfc_add_volatile (¤t_attr, NULL, &seen_at[d]);
3832 break;
3833
3834 default:
3835 gfc_internal_error ("match_attr_spec(): Bad attribute");
3836 }
3837
3838 if (t == FAILURE)
3839 {
3840 m = MATCH_ERROR;
3841 goto cleanup;
3842 }
3843 }
3844
3845 /* Since Fortran 2008 module variables implicitly have the SAVE attribute. */
3846 if (gfc_current_state () == COMP_MODULE && !current_attr.save
3847 && (gfc_option.allow_std & GFC_STD_F2008) != 0)
3848 current_attr.save = SAVE_IMPLICIT;
3849
3850 colon_seen = 1;
3851 return MATCH_YES;
3852
3853 cleanup:
3854 gfc_current_locus = start;
3855 gfc_free_array_spec (current_as);
3856 current_as = NULL;
3857 return m;
3858 }
3859
3860
3861 /* Set the binding label, dest_label, either with the binding label
3862 stored in the given gfc_typespec, ts, or if none was provided, it
3863 will be the symbol name in all lower case, as required by the draft
3864 (J3/04-007, section 15.4.1). If a binding label was given and
3865 there is more than one argument (num_idents), it is an error. */
3866
3867 static gfc_try
set_binding_label(const char ** dest_label,const char * sym_name,int num_idents)3868 set_binding_label (const char **dest_label, const char *sym_name,
3869 int num_idents)
3870 {
3871 if (num_idents > 1 && has_name_equals)
3872 {
3873 gfc_error ("Multiple identifiers provided with "
3874 "single NAME= specifier at %C");
3875 return FAILURE;
3876 }
3877
3878 if (curr_binding_label)
3879 /* Binding label given; store in temp holder till have sym. */
3880 *dest_label = curr_binding_label;
3881 else
3882 {
3883 /* No binding label given, and the NAME= specifier did not exist,
3884 which means there was no NAME="". */
3885 if (sym_name != NULL && has_name_equals == 0)
3886 *dest_label = IDENTIFIER_POINTER (get_identifier (sym_name));
3887 }
3888
3889 return SUCCESS;
3890 }
3891
3892
3893 /* Set the status of the given common block as being BIND(C) or not,
3894 depending on the given parameter, is_bind_c. */
3895
3896 void
set_com_block_bind_c(gfc_common_head * com_block,int is_bind_c)3897 set_com_block_bind_c (gfc_common_head *com_block, int is_bind_c)
3898 {
3899 com_block->is_bind_c = is_bind_c;
3900 return;
3901 }
3902
3903
3904 /* Verify that the given gfc_typespec is for a C interoperable type. */
3905
3906 gfc_try
gfc_verify_c_interop(gfc_typespec * ts)3907 gfc_verify_c_interop (gfc_typespec *ts)
3908 {
3909 if (ts->type == BT_DERIVED && ts->u.derived != NULL)
3910 return (ts->u.derived->ts.is_c_interop || ts->u.derived->attr.is_bind_c)
3911 ? SUCCESS : FAILURE;
3912 else if (ts->type == BT_CLASS)
3913 return FAILURE;
3914 else if (ts->is_c_interop != 1 && ts->type != BT_ASSUMED)
3915 return FAILURE;
3916
3917 return SUCCESS;
3918 }
3919
3920
3921 /* Verify that the variables of a given common block, which has been
3922 defined with the attribute specifier bind(c), to be of a C
3923 interoperable type. Errors will be reported here, if
3924 encountered. */
3925
3926 gfc_try
verify_com_block_vars_c_interop(gfc_common_head * com_block)3927 verify_com_block_vars_c_interop (gfc_common_head *com_block)
3928 {
3929 gfc_symbol *curr_sym = NULL;
3930 gfc_try retval = SUCCESS;
3931
3932 curr_sym = com_block->head;
3933
3934 /* Make sure we have at least one symbol. */
3935 if (curr_sym == NULL)
3936 return retval;
3937
3938 /* Here we know we have a symbol, so we'll execute this loop
3939 at least once. */
3940 do
3941 {
3942 /* The second to last param, 1, says this is in a common block. */
3943 retval = verify_bind_c_sym (curr_sym, &(curr_sym->ts), 1, com_block);
3944 curr_sym = curr_sym->common_next;
3945 } while (curr_sym != NULL);
3946
3947 return retval;
3948 }
3949
3950
3951 /* Verify that a given BIND(C) symbol is C interoperable. If it is not,
3952 an appropriate error message is reported. */
3953
3954 gfc_try
verify_bind_c_sym(gfc_symbol * tmp_sym,gfc_typespec * ts,int is_in_common,gfc_common_head * com_block)3955 verify_bind_c_sym (gfc_symbol *tmp_sym, gfc_typespec *ts,
3956 int is_in_common, gfc_common_head *com_block)
3957 {
3958 bool bind_c_function = false;
3959 gfc_try retval = SUCCESS;
3960
3961 if (tmp_sym->attr.function && tmp_sym->attr.is_bind_c)
3962 bind_c_function = true;
3963
3964 if (tmp_sym->attr.function && tmp_sym->result != NULL)
3965 {
3966 tmp_sym = tmp_sym->result;
3967 /* Make sure it wasn't an implicitly typed result. */
3968 if (tmp_sym->attr.implicit_type && gfc_option.warn_c_binding_type)
3969 {
3970 gfc_warning ("Implicitly declared BIND(C) function '%s' at "
3971 "%L may not be C interoperable", tmp_sym->name,
3972 &tmp_sym->declared_at);
3973 tmp_sym->ts.f90_type = tmp_sym->ts.type;
3974 /* Mark it as C interoperable to prevent duplicate warnings. */
3975 tmp_sym->ts.is_c_interop = 1;
3976 tmp_sym->attr.is_c_interop = 1;
3977 }
3978 }
3979
3980 /* Here, we know we have the bind(c) attribute, so if we have
3981 enough type info, then verify that it's a C interop kind.
3982 The info could be in the symbol already, or possibly still in
3983 the given ts (current_ts), so look in both. */
3984 if (tmp_sym->ts.type != BT_UNKNOWN || ts->type != BT_UNKNOWN)
3985 {
3986 if (gfc_verify_c_interop (&(tmp_sym->ts)) != SUCCESS)
3987 {
3988 /* See if we're dealing with a sym in a common block or not. */
3989 if (is_in_common == 1 && gfc_option.warn_c_binding_type)
3990 {
3991 gfc_warning ("Variable '%s' in common block '%s' at %L "
3992 "may not be a C interoperable "
3993 "kind though common block '%s' is BIND(C)",
3994 tmp_sym->name, com_block->name,
3995 &(tmp_sym->declared_at), com_block->name);
3996 }
3997 else
3998 {
3999 if (tmp_sym->ts.type == BT_DERIVED || ts->type == BT_DERIVED)
4000 gfc_error ("Type declaration '%s' at %L is not C "
4001 "interoperable but it is BIND(C)",
4002 tmp_sym->name, &(tmp_sym->declared_at));
4003 else if (gfc_option.warn_c_binding_type)
4004 gfc_warning ("Variable '%s' at %L "
4005 "may not be a C interoperable "
4006 "kind but it is bind(c)",
4007 tmp_sym->name, &(tmp_sym->declared_at));
4008 }
4009 }
4010
4011 /* Variables declared w/in a common block can't be bind(c)
4012 since there's no way for C to see these variables, so there's
4013 semantically no reason for the attribute. */
4014 if (is_in_common == 1 && tmp_sym->attr.is_bind_c == 1)
4015 {
4016 gfc_error ("Variable '%s' in common block '%s' at "
4017 "%L cannot be declared with BIND(C) "
4018 "since it is not a global",
4019 tmp_sym->name, com_block->name,
4020 &(tmp_sym->declared_at));
4021 retval = FAILURE;
4022 }
4023
4024 /* Scalar variables that are bind(c) can not have the pointer
4025 or allocatable attributes. */
4026 if (tmp_sym->attr.is_bind_c == 1)
4027 {
4028 if (tmp_sym->attr.pointer == 1)
4029 {
4030 gfc_error ("Variable '%s' at %L cannot have both the "
4031 "POINTER and BIND(C) attributes",
4032 tmp_sym->name, &(tmp_sym->declared_at));
4033 retval = FAILURE;
4034 }
4035
4036 if (tmp_sym->attr.allocatable == 1)
4037 {
4038 gfc_error ("Variable '%s' at %L cannot have both the "
4039 "ALLOCATABLE and BIND(C) attributes",
4040 tmp_sym->name, &(tmp_sym->declared_at));
4041 retval = FAILURE;
4042 }
4043
4044 }
4045
4046 /* If it is a BIND(C) function, make sure the return value is a
4047 scalar value. The previous tests in this function made sure
4048 the type is interoperable. */
4049 if (bind_c_function && tmp_sym->as != NULL)
4050 gfc_error ("Return type of BIND(C) function '%s' at %L cannot "
4051 "be an array", tmp_sym->name, &(tmp_sym->declared_at));
4052
4053 /* BIND(C) functions can not return a character string. */
4054 if (bind_c_function && tmp_sym->ts.type == BT_CHARACTER)
4055 if (tmp_sym->ts.u.cl == NULL || tmp_sym->ts.u.cl->length == NULL
4056 || tmp_sym->ts.u.cl->length->expr_type != EXPR_CONSTANT
4057 || mpz_cmp_si (tmp_sym->ts.u.cl->length->value.integer, 1) != 0)
4058 gfc_error ("Return type of BIND(C) function '%s' at %L cannot "
4059 "be a character string", tmp_sym->name,
4060 &(tmp_sym->declared_at));
4061 }
4062
4063 /* See if the symbol has been marked as private. If it has, make sure
4064 there is no binding label and warn the user if there is one. */
4065 if (tmp_sym->attr.access == ACCESS_PRIVATE
4066 && tmp_sym->binding_label)
4067 /* Use gfc_warning_now because we won't say that the symbol fails
4068 just because of this. */
4069 gfc_warning_now ("Symbol '%s' at %L is marked PRIVATE but has been "
4070 "given the binding label '%s'", tmp_sym->name,
4071 &(tmp_sym->declared_at), tmp_sym->binding_label);
4072
4073 return retval;
4074 }
4075
4076
4077 /* Set the appropriate fields for a symbol that's been declared as
4078 BIND(C) (the is_bind_c flag and the binding label), and verify that
4079 the type is C interoperable. Errors are reported by the functions
4080 used to set/test these fields. */
4081
4082 gfc_try
set_verify_bind_c_sym(gfc_symbol * tmp_sym,int num_idents)4083 set_verify_bind_c_sym (gfc_symbol *tmp_sym, int num_idents)
4084 {
4085 gfc_try retval = SUCCESS;
4086
4087 /* TODO: Do we need to make sure the vars aren't marked private? */
4088
4089 /* Set the is_bind_c bit in symbol_attribute. */
4090 gfc_add_is_bind_c (&(tmp_sym->attr), tmp_sym->name, &gfc_current_locus, 0);
4091
4092 if (set_binding_label (&tmp_sym->binding_label, tmp_sym->name,
4093 num_idents) != SUCCESS)
4094 return FAILURE;
4095
4096 return retval;
4097 }
4098
4099
4100 /* Set the fields marking the given common block as BIND(C), including
4101 a binding label, and report any errors encountered. */
4102
4103 gfc_try
set_verify_bind_c_com_block(gfc_common_head * com_block,int num_idents)4104 set_verify_bind_c_com_block (gfc_common_head *com_block, int num_idents)
4105 {
4106 gfc_try retval = SUCCESS;
4107
4108 /* destLabel, common name, typespec (which may have binding label). */
4109 if (set_binding_label (&com_block->binding_label, com_block->name,
4110 num_idents)
4111 != SUCCESS)
4112 return FAILURE;
4113
4114 /* Set the given common block (com_block) to being bind(c) (1). */
4115 set_com_block_bind_c (com_block, 1);
4116
4117 return retval;
4118 }
4119
4120
4121 /* Retrieve the list of one or more identifiers that the given bind(c)
4122 attribute applies to. */
4123
4124 gfc_try
get_bind_c_idents(void)4125 get_bind_c_idents (void)
4126 {
4127 char name[GFC_MAX_SYMBOL_LEN + 1];
4128 int num_idents = 0;
4129 gfc_symbol *tmp_sym = NULL;
4130 match found_id;
4131 gfc_common_head *com_block = NULL;
4132
4133 if (gfc_match_name (name) == MATCH_YES)
4134 {
4135 found_id = MATCH_YES;
4136 gfc_get_ha_symbol (name, &tmp_sym);
4137 }
4138 else if (match_common_name (name) == MATCH_YES)
4139 {
4140 found_id = MATCH_YES;
4141 com_block = gfc_get_common (name, 0);
4142 }
4143 else
4144 {
4145 gfc_error ("Need either entity or common block name for "
4146 "attribute specification statement at %C");
4147 return FAILURE;
4148 }
4149
4150 /* Save the current identifier and look for more. */
4151 do
4152 {
4153 /* Increment the number of identifiers found for this spec stmt. */
4154 num_idents++;
4155
4156 /* Make sure we have a sym or com block, and verify that it can
4157 be bind(c). Set the appropriate field(s) and look for more
4158 identifiers. */
4159 if (tmp_sym != NULL || com_block != NULL)
4160 {
4161 if (tmp_sym != NULL)
4162 {
4163 if (set_verify_bind_c_sym (tmp_sym, num_idents)
4164 != SUCCESS)
4165 return FAILURE;
4166 }
4167 else
4168 {
4169 if (set_verify_bind_c_com_block(com_block, num_idents)
4170 != SUCCESS)
4171 return FAILURE;
4172 }
4173
4174 /* Look to see if we have another identifier. */
4175 tmp_sym = NULL;
4176 if (gfc_match_eos () == MATCH_YES)
4177 found_id = MATCH_NO;
4178 else if (gfc_match_char (',') != MATCH_YES)
4179 found_id = MATCH_NO;
4180 else if (gfc_match_name (name) == MATCH_YES)
4181 {
4182 found_id = MATCH_YES;
4183 gfc_get_ha_symbol (name, &tmp_sym);
4184 }
4185 else if (match_common_name (name) == MATCH_YES)
4186 {
4187 found_id = MATCH_YES;
4188 com_block = gfc_get_common (name, 0);
4189 }
4190 else
4191 {
4192 gfc_error ("Missing entity or common block name for "
4193 "attribute specification statement at %C");
4194 return FAILURE;
4195 }
4196 }
4197 else
4198 {
4199 gfc_internal_error ("Missing symbol");
4200 }
4201 } while (found_id == MATCH_YES);
4202
4203 /* if we get here we were successful */
4204 return SUCCESS;
4205 }
4206
4207
4208 /* Try and match a BIND(C) attribute specification statement. */
4209
4210 match
gfc_match_bind_c_stmt(void)4211 gfc_match_bind_c_stmt (void)
4212 {
4213 match found_match = MATCH_NO;
4214 gfc_typespec *ts;
4215
4216 ts = ¤t_ts;
4217
4218 /* This may not be necessary. */
4219 gfc_clear_ts (ts);
4220 /* Clear the temporary binding label holder. */
4221 curr_binding_label = NULL;
4222
4223 /* Look for the bind(c). */
4224 found_match = gfc_match_bind_c (NULL, true);
4225
4226 if (found_match == MATCH_YES)
4227 {
4228 /* Look for the :: now, but it is not required. */
4229 gfc_match (" :: ");
4230
4231 /* Get the identifier(s) that needs to be updated. This may need to
4232 change to hand the flag(s) for the attr specified so all identifiers
4233 found can have all appropriate parts updated (assuming that the same
4234 spec stmt can have multiple attrs, such as both bind(c) and
4235 allocatable...). */
4236 if (get_bind_c_idents () != SUCCESS)
4237 /* Error message should have printed already. */
4238 return MATCH_ERROR;
4239 }
4240
4241 return found_match;
4242 }
4243
4244
4245 /* Match a data declaration statement. */
4246
4247 match
gfc_match_data_decl(void)4248 gfc_match_data_decl (void)
4249 {
4250 gfc_symbol *sym;
4251 match m;
4252 int elem;
4253
4254 num_idents_on_line = 0;
4255
4256 m = gfc_match_decl_type_spec (¤t_ts, 0);
4257 if (m != MATCH_YES)
4258 return m;
4259
4260 if ((current_ts.type == BT_DERIVED || current_ts.type == BT_CLASS)
4261 && gfc_current_state () != COMP_DERIVED)
4262 {
4263 sym = gfc_use_derived (current_ts.u.derived);
4264
4265 if (sym == NULL)
4266 {
4267 m = MATCH_ERROR;
4268 goto cleanup;
4269 }
4270
4271 current_ts.u.derived = sym;
4272 }
4273
4274 m = match_attr_spec ();
4275 if (m == MATCH_ERROR)
4276 {
4277 m = MATCH_NO;
4278 goto cleanup;
4279 }
4280
4281 if (current_ts.type == BT_CLASS
4282 && current_ts.u.derived->attr.unlimited_polymorphic)
4283 goto ok;
4284
4285 if ((current_ts.type == BT_DERIVED || current_ts.type == BT_CLASS)
4286 && current_ts.u.derived->components == NULL
4287 && !current_ts.u.derived->attr.zero_comp)
4288 {
4289
4290 if (current_attr.pointer && gfc_current_state () == COMP_DERIVED)
4291 goto ok;
4292
4293 gfc_find_symbol (current_ts.u.derived->name,
4294 current_ts.u.derived->ns, 1, &sym);
4295
4296 /* Any symbol that we find had better be a type definition
4297 which has its components defined. */
4298 if (sym != NULL && sym->attr.flavor == FL_DERIVED
4299 && (current_ts.u.derived->components != NULL
4300 || current_ts.u.derived->attr.zero_comp))
4301 goto ok;
4302
4303 /* Now we have an error, which we signal, and then fix up
4304 because the knock-on is plain and simple confusing. */
4305 gfc_error_now ("Derived type at %C has not been previously defined "
4306 "and so cannot appear in a derived type definition");
4307 current_attr.pointer = 1;
4308 goto ok;
4309 }
4310
4311 ok:
4312 /* If we have an old-style character declaration, and no new-style
4313 attribute specifications, then there a comma is optional between
4314 the type specification and the variable list. */
4315 if (m == MATCH_NO && current_ts.type == BT_CHARACTER && old_char_selector)
4316 gfc_match_char (',');
4317
4318 /* Give the types/attributes to symbols that follow. Give the element
4319 a number so that repeat character length expressions can be copied. */
4320 elem = 1;
4321 for (;;)
4322 {
4323 num_idents_on_line++;
4324 m = variable_decl (elem++);
4325 if (m == MATCH_ERROR)
4326 goto cleanup;
4327 if (m == MATCH_NO)
4328 break;
4329
4330 if (gfc_match_eos () == MATCH_YES)
4331 goto cleanup;
4332 if (gfc_match_char (',') != MATCH_YES)
4333 break;
4334 }
4335
4336 if (gfc_error_flag_test () == 0)
4337 gfc_error ("Syntax error in data declaration at %C");
4338 m = MATCH_ERROR;
4339
4340 gfc_free_data_all (gfc_current_ns);
4341
4342 cleanup:
4343 gfc_free_array_spec (current_as);
4344 current_as = NULL;
4345 return m;
4346 }
4347
4348
4349 /* Match a prefix associated with a function or subroutine
4350 declaration. If the typespec pointer is nonnull, then a typespec
4351 can be matched. Note that if nothing matches, MATCH_YES is
4352 returned (the null string was matched). */
4353
4354 match
gfc_match_prefix(gfc_typespec * ts)4355 gfc_match_prefix (gfc_typespec *ts)
4356 {
4357 bool seen_type;
4358 bool seen_impure;
4359 bool found_prefix;
4360
4361 gfc_clear_attr (¤t_attr);
4362 seen_type = false;
4363 seen_impure = false;
4364
4365 gcc_assert (!gfc_matching_prefix);
4366 gfc_matching_prefix = true;
4367
4368 do
4369 {
4370 found_prefix = false;
4371
4372 if (!seen_type && ts != NULL
4373 && gfc_match_decl_type_spec (ts, 0) == MATCH_YES
4374 && gfc_match_space () == MATCH_YES)
4375 {
4376
4377 seen_type = true;
4378 found_prefix = true;
4379 }
4380
4381 if (gfc_match ("elemental% ") == MATCH_YES)
4382 {
4383 if (gfc_add_elemental (¤t_attr, NULL) == FAILURE)
4384 goto error;
4385
4386 found_prefix = true;
4387 }
4388
4389 if (gfc_match ("pure% ") == MATCH_YES)
4390 {
4391 if (gfc_add_pure (¤t_attr, NULL) == FAILURE)
4392 goto error;
4393
4394 found_prefix = true;
4395 }
4396
4397 if (gfc_match ("recursive% ") == MATCH_YES)
4398 {
4399 if (gfc_add_recursive (¤t_attr, NULL) == FAILURE)
4400 goto error;
4401
4402 found_prefix = true;
4403 }
4404
4405 /* IMPURE is a somewhat special case, as it needs not set an actual
4406 attribute but rather only prevents ELEMENTAL routines from being
4407 automatically PURE. */
4408 if (gfc_match ("impure% ") == MATCH_YES)
4409 {
4410 if (gfc_notify_std (GFC_STD_F2008,
4411 "IMPURE procedure at %C")
4412 == FAILURE)
4413 goto error;
4414
4415 seen_impure = true;
4416 found_prefix = true;
4417 }
4418 }
4419 while (found_prefix);
4420
4421 /* IMPURE and PURE must not both appear, of course. */
4422 if (seen_impure && current_attr.pure)
4423 {
4424 gfc_error ("PURE and IMPURE must not appear both at %C");
4425 goto error;
4426 }
4427
4428 /* If IMPURE it not seen but the procedure is ELEMENTAL, mark it as PURE. */
4429 if (!seen_impure && current_attr.elemental && !current_attr.pure)
4430 {
4431 if (gfc_add_pure (¤t_attr, NULL) == FAILURE)
4432 goto error;
4433 }
4434
4435 /* At this point, the next item is not a prefix. */
4436 gcc_assert (gfc_matching_prefix);
4437 gfc_matching_prefix = false;
4438 return MATCH_YES;
4439
4440 error:
4441 gcc_assert (gfc_matching_prefix);
4442 gfc_matching_prefix = false;
4443 return MATCH_ERROR;
4444 }
4445
4446
4447 /* Copy attributes matched by gfc_match_prefix() to attributes on a symbol. */
4448
4449 static gfc_try
copy_prefix(symbol_attribute * dest,locus * where)4450 copy_prefix (symbol_attribute *dest, locus *where)
4451 {
4452 if (current_attr.pure && gfc_add_pure (dest, where) == FAILURE)
4453 return FAILURE;
4454
4455 if (current_attr.elemental && gfc_add_elemental (dest, where) == FAILURE)
4456 return FAILURE;
4457
4458 if (current_attr.recursive && gfc_add_recursive (dest, where) == FAILURE)
4459 return FAILURE;
4460
4461 return SUCCESS;
4462 }
4463
4464
4465 /* Match a formal argument list. */
4466
4467 match
gfc_match_formal_arglist(gfc_symbol * progname,int st_flag,int null_flag)4468 gfc_match_formal_arglist (gfc_symbol *progname, int st_flag, int null_flag)
4469 {
4470 gfc_formal_arglist *head, *tail, *p, *q;
4471 char name[GFC_MAX_SYMBOL_LEN + 1];
4472 gfc_symbol *sym;
4473 match m;
4474
4475 head = tail = NULL;
4476
4477 if (gfc_match_char ('(') != MATCH_YES)
4478 {
4479 if (null_flag)
4480 goto ok;
4481 return MATCH_NO;
4482 }
4483
4484 if (gfc_match_char (')') == MATCH_YES)
4485 goto ok;
4486
4487 for (;;)
4488 {
4489 if (gfc_match_char ('*') == MATCH_YES)
4490 sym = NULL;
4491 else
4492 {
4493 m = gfc_match_name (name);
4494 if (m != MATCH_YES)
4495 goto cleanup;
4496
4497 if (gfc_get_symbol (name, NULL, &sym))
4498 goto cleanup;
4499 }
4500
4501 p = gfc_get_formal_arglist ();
4502
4503 if (head == NULL)
4504 head = tail = p;
4505 else
4506 {
4507 tail->next = p;
4508 tail = p;
4509 }
4510
4511 tail->sym = sym;
4512
4513 /* We don't add the VARIABLE flavor because the name could be a
4514 dummy procedure. We don't apply these attributes to formal
4515 arguments of statement functions. */
4516 if (sym != NULL && !st_flag
4517 && (gfc_add_dummy (&sym->attr, sym->name, NULL) == FAILURE
4518 || gfc_missing_attr (&sym->attr, NULL) == FAILURE))
4519 {
4520 m = MATCH_ERROR;
4521 goto cleanup;
4522 }
4523
4524 /* The name of a program unit can be in a different namespace,
4525 so check for it explicitly. After the statement is accepted,
4526 the name is checked for especially in gfc_get_symbol(). */
4527 if (gfc_new_block != NULL && sym != NULL
4528 && strcmp (sym->name, gfc_new_block->name) == 0)
4529 {
4530 gfc_error ("Name '%s' at %C is the name of the procedure",
4531 sym->name);
4532 m = MATCH_ERROR;
4533 goto cleanup;
4534 }
4535
4536 if (gfc_match_char (')') == MATCH_YES)
4537 goto ok;
4538
4539 m = gfc_match_char (',');
4540 if (m != MATCH_YES)
4541 {
4542 gfc_error ("Unexpected junk in formal argument list at %C");
4543 goto cleanup;
4544 }
4545 }
4546
4547 ok:
4548 /* Check for duplicate symbols in the formal argument list. */
4549 if (head != NULL)
4550 {
4551 for (p = head; p->next; p = p->next)
4552 {
4553 if (p->sym == NULL)
4554 continue;
4555
4556 for (q = p->next; q; q = q->next)
4557 if (p->sym == q->sym)
4558 {
4559 gfc_error ("Duplicate symbol '%s' in formal argument list "
4560 "at %C", p->sym->name);
4561
4562 m = MATCH_ERROR;
4563 goto cleanup;
4564 }
4565 }
4566 }
4567
4568 if (gfc_add_explicit_interface (progname, IFSRC_DECL, head, NULL)
4569 == FAILURE)
4570 {
4571 m = MATCH_ERROR;
4572 goto cleanup;
4573 }
4574
4575 return MATCH_YES;
4576
4577 cleanup:
4578 gfc_free_formal_arglist (head);
4579 return m;
4580 }
4581
4582
4583 /* Match a RESULT specification following a function declaration or
4584 ENTRY statement. Also matches the end-of-statement. */
4585
4586 static match
match_result(gfc_symbol * function,gfc_symbol ** result)4587 match_result (gfc_symbol *function, gfc_symbol **result)
4588 {
4589 char name[GFC_MAX_SYMBOL_LEN + 1];
4590 gfc_symbol *r;
4591 match m;
4592
4593 if (gfc_match (" result (") != MATCH_YES)
4594 return MATCH_NO;
4595
4596 m = gfc_match_name (name);
4597 if (m != MATCH_YES)
4598 return m;
4599
4600 /* Get the right paren, and that's it because there could be the
4601 bind(c) attribute after the result clause. */
4602 if (gfc_match_char(')') != MATCH_YES)
4603 {
4604 /* TODO: should report the missing right paren here. */
4605 return MATCH_ERROR;
4606 }
4607
4608 if (strcmp (function->name, name) == 0)
4609 {
4610 gfc_error ("RESULT variable at %C must be different than function name");
4611 return MATCH_ERROR;
4612 }
4613
4614 if (gfc_get_symbol (name, NULL, &r))
4615 return MATCH_ERROR;
4616
4617 if (gfc_add_result (&r->attr, r->name, NULL) == FAILURE)
4618 return MATCH_ERROR;
4619
4620 *result = r;
4621
4622 return MATCH_YES;
4623 }
4624
4625
4626 /* Match a function suffix, which could be a combination of a result
4627 clause and BIND(C), either one, or neither. The draft does not
4628 require them to come in a specific order. */
4629
4630 match
gfc_match_suffix(gfc_symbol * sym,gfc_symbol ** result)4631 gfc_match_suffix (gfc_symbol *sym, gfc_symbol **result)
4632 {
4633 match is_bind_c; /* Found bind(c). */
4634 match is_result; /* Found result clause. */
4635 match found_match; /* Status of whether we've found a good match. */
4636 char peek_char; /* Character we're going to peek at. */
4637 bool allow_binding_name;
4638
4639 /* Initialize to having found nothing. */
4640 found_match = MATCH_NO;
4641 is_bind_c = MATCH_NO;
4642 is_result = MATCH_NO;
4643
4644 /* Get the next char to narrow between result and bind(c). */
4645 gfc_gobble_whitespace ();
4646 peek_char = gfc_peek_ascii_char ();
4647
4648 /* C binding names are not allowed for internal procedures. */
4649 if (gfc_current_state () == COMP_CONTAINS
4650 && sym->ns->proc_name->attr.flavor != FL_MODULE)
4651 allow_binding_name = false;
4652 else
4653 allow_binding_name = true;
4654
4655 switch (peek_char)
4656 {
4657 case 'r':
4658 /* Look for result clause. */
4659 is_result = match_result (sym, result);
4660 if (is_result == MATCH_YES)
4661 {
4662 /* Now see if there is a bind(c) after it. */
4663 is_bind_c = gfc_match_bind_c (sym, allow_binding_name);
4664 /* We've found the result clause and possibly bind(c). */
4665 found_match = MATCH_YES;
4666 }
4667 else
4668 /* This should only be MATCH_ERROR. */
4669 found_match = is_result;
4670 break;
4671 case 'b':
4672 /* Look for bind(c) first. */
4673 is_bind_c = gfc_match_bind_c (sym, allow_binding_name);
4674 if (is_bind_c == MATCH_YES)
4675 {
4676 /* Now see if a result clause followed it. */
4677 is_result = match_result (sym, result);
4678 found_match = MATCH_YES;
4679 }
4680 else
4681 {
4682 /* Should only be a MATCH_ERROR if we get here after seeing 'b'. */
4683 found_match = MATCH_ERROR;
4684 }
4685 break;
4686 default:
4687 gfc_error ("Unexpected junk after function declaration at %C");
4688 found_match = MATCH_ERROR;
4689 break;
4690 }
4691
4692 if (is_bind_c == MATCH_YES)
4693 {
4694 /* Fortran 2008 draft allows BIND(C) for internal procedures. */
4695 if (gfc_current_state () == COMP_CONTAINS
4696 && sym->ns->proc_name->attr.flavor != FL_MODULE
4697 && gfc_notify_std (GFC_STD_F2008, "BIND(C) attribute "
4698 "at %L may not be specified for an internal "
4699 "procedure", &gfc_current_locus)
4700 == FAILURE)
4701 return MATCH_ERROR;
4702
4703 if (gfc_add_is_bind_c (&(sym->attr), sym->name, &gfc_current_locus, 1)
4704 == FAILURE)
4705 return MATCH_ERROR;
4706 }
4707
4708 return found_match;
4709 }
4710
4711
4712 /* Procedure pointer return value without RESULT statement:
4713 Add "hidden" result variable named "ppr@". */
4714
4715 static gfc_try
add_hidden_procptr_result(gfc_symbol * sym)4716 add_hidden_procptr_result (gfc_symbol *sym)
4717 {
4718 bool case1,case2;
4719
4720 if (gfc_notification_std (GFC_STD_F2003) == ERROR)
4721 return FAILURE;
4722
4723 /* First usage case: PROCEDURE and EXTERNAL statements. */
4724 case1 = gfc_current_state () == COMP_FUNCTION && gfc_current_block ()
4725 && strcmp (gfc_current_block ()->name, sym->name) == 0
4726 && sym->attr.external;
4727 /* Second usage case: INTERFACE statements. */
4728 case2 = gfc_current_state () == COMP_INTERFACE && gfc_state_stack->previous
4729 && gfc_state_stack->previous->state == COMP_FUNCTION
4730 && strcmp (gfc_state_stack->previous->sym->name, sym->name) == 0;
4731
4732 if (case1 || case2)
4733 {
4734 gfc_symtree *stree;
4735 if (case1)
4736 gfc_get_sym_tree ("ppr@", gfc_current_ns, &stree, false);
4737 else if (case2)
4738 {
4739 gfc_symtree *st2;
4740 gfc_get_sym_tree ("ppr@", gfc_current_ns->parent, &stree, false);
4741 st2 = gfc_new_symtree (&gfc_current_ns->sym_root, "ppr@");
4742 st2->n.sym = stree->n.sym;
4743 }
4744 sym->result = stree->n.sym;
4745
4746 sym->result->attr.proc_pointer = sym->attr.proc_pointer;
4747 sym->result->attr.pointer = sym->attr.pointer;
4748 sym->result->attr.external = sym->attr.external;
4749 sym->result->attr.referenced = sym->attr.referenced;
4750 sym->result->ts = sym->ts;
4751 sym->attr.proc_pointer = 0;
4752 sym->attr.pointer = 0;
4753 sym->attr.external = 0;
4754 if (sym->result->attr.external && sym->result->attr.pointer)
4755 {
4756 sym->result->attr.pointer = 0;
4757 sym->result->attr.proc_pointer = 1;
4758 }
4759
4760 return gfc_add_result (&sym->result->attr, sym->result->name, NULL);
4761 }
4762 /* POINTER after PROCEDURE/EXTERNAL/INTERFACE statement. */
4763 else if (sym->attr.function && !sym->attr.external && sym->attr.pointer
4764 && sym->result && sym->result != sym && sym->result->attr.external
4765 && sym == gfc_current_ns->proc_name
4766 && sym == sym->result->ns->proc_name
4767 && strcmp ("ppr@", sym->result->name) == 0)
4768 {
4769 sym->result->attr.proc_pointer = 1;
4770 sym->attr.pointer = 0;
4771 return SUCCESS;
4772 }
4773 else
4774 return FAILURE;
4775 }
4776
4777
4778 /* Match the interface for a PROCEDURE declaration,
4779 including brackets (R1212). */
4780
4781 static match
match_procedure_interface(gfc_symbol ** proc_if)4782 match_procedure_interface (gfc_symbol **proc_if)
4783 {
4784 match m;
4785 gfc_symtree *st;
4786 locus old_loc, entry_loc;
4787 gfc_namespace *old_ns = gfc_current_ns;
4788 char name[GFC_MAX_SYMBOL_LEN + 1];
4789
4790 old_loc = entry_loc = gfc_current_locus;
4791 gfc_clear_ts (¤t_ts);
4792
4793 if (gfc_match (" (") != MATCH_YES)
4794 {
4795 gfc_current_locus = entry_loc;
4796 return MATCH_NO;
4797 }
4798
4799 /* Get the type spec. for the procedure interface. */
4800 old_loc = gfc_current_locus;
4801 m = gfc_match_decl_type_spec (¤t_ts, 0);
4802 gfc_gobble_whitespace ();
4803 if (m == MATCH_YES || (m == MATCH_NO && gfc_peek_ascii_char () == ')'))
4804 goto got_ts;
4805
4806 if (m == MATCH_ERROR)
4807 return m;
4808
4809 /* Procedure interface is itself a procedure. */
4810 gfc_current_locus = old_loc;
4811 m = gfc_match_name (name);
4812
4813 /* First look to see if it is already accessible in the current
4814 namespace because it is use associated or contained. */
4815 st = NULL;
4816 if (gfc_find_sym_tree (name, NULL, 0, &st))
4817 return MATCH_ERROR;
4818
4819 /* If it is still not found, then try the parent namespace, if it
4820 exists and create the symbol there if it is still not found. */
4821 if (gfc_current_ns->parent)
4822 gfc_current_ns = gfc_current_ns->parent;
4823 if (st == NULL && gfc_get_ha_sym_tree (name, &st))
4824 return MATCH_ERROR;
4825
4826 gfc_current_ns = old_ns;
4827 *proc_if = st->n.sym;
4828
4829 if (*proc_if)
4830 {
4831 (*proc_if)->refs++;
4832 /* Resolve interface if possible. That way, attr.procedure is only set
4833 if it is declared by a later procedure-declaration-stmt, which is
4834 invalid per F08:C1216 (cf. resolve_procedure_interface). */
4835 while ((*proc_if)->ts.interface)
4836 *proc_if = (*proc_if)->ts.interface;
4837
4838 if ((*proc_if)->attr.flavor == FL_UNKNOWN
4839 && (*proc_if)->ts.type == BT_UNKNOWN
4840 && gfc_add_flavor (&(*proc_if)->attr, FL_PROCEDURE,
4841 (*proc_if)->name, NULL) == FAILURE)
4842 return MATCH_ERROR;
4843 }
4844
4845 got_ts:
4846 if (gfc_match (" )") != MATCH_YES)
4847 {
4848 gfc_current_locus = entry_loc;
4849 return MATCH_NO;
4850 }
4851
4852 return MATCH_YES;
4853 }
4854
4855
4856 /* Match a PROCEDURE declaration (R1211). */
4857
4858 static match
match_procedure_decl(void)4859 match_procedure_decl (void)
4860 {
4861 match m;
4862 gfc_symbol *sym, *proc_if = NULL;
4863 int num;
4864 gfc_expr *initializer = NULL;
4865
4866 /* Parse interface (with brackets). */
4867 m = match_procedure_interface (&proc_if);
4868 if (m != MATCH_YES)
4869 return m;
4870
4871 /* Parse attributes (with colons). */
4872 m = match_attr_spec();
4873 if (m == MATCH_ERROR)
4874 return MATCH_ERROR;
4875
4876 if (proc_if && proc_if->attr.is_bind_c && !current_attr.is_bind_c)
4877 {
4878 current_attr.is_bind_c = 1;
4879 has_name_equals = 0;
4880 curr_binding_label = NULL;
4881 }
4882
4883 /* Get procedure symbols. */
4884 for(num=1;;num++)
4885 {
4886 m = gfc_match_symbol (&sym, 0);
4887 if (m == MATCH_NO)
4888 goto syntax;
4889 else if (m == MATCH_ERROR)
4890 return m;
4891
4892 /* Add current_attr to the symbol attributes. */
4893 if (gfc_copy_attr (&sym->attr, ¤t_attr, NULL) == FAILURE)
4894 return MATCH_ERROR;
4895
4896 if (sym->attr.is_bind_c)
4897 {
4898 /* Check for C1218. */
4899 if (!proc_if || !proc_if->attr.is_bind_c)
4900 {
4901 gfc_error ("BIND(C) attribute at %C requires "
4902 "an interface with BIND(C)");
4903 return MATCH_ERROR;
4904 }
4905 /* Check for C1217. */
4906 if (has_name_equals && sym->attr.pointer)
4907 {
4908 gfc_error ("BIND(C) procedure with NAME may not have "
4909 "POINTER attribute at %C");
4910 return MATCH_ERROR;
4911 }
4912 if (has_name_equals && sym->attr.dummy)
4913 {
4914 gfc_error ("Dummy procedure at %C may not have "
4915 "BIND(C) attribute with NAME");
4916 return MATCH_ERROR;
4917 }
4918 /* Set binding label for BIND(C). */
4919 if (set_binding_label (&sym->binding_label, sym->name, num)
4920 != SUCCESS)
4921 return MATCH_ERROR;
4922 }
4923
4924 if (gfc_add_external (&sym->attr, NULL) == FAILURE)
4925 return MATCH_ERROR;
4926
4927 if (add_hidden_procptr_result (sym) == SUCCESS)
4928 sym = sym->result;
4929
4930 if (gfc_add_proc (&sym->attr, sym->name, NULL) == FAILURE)
4931 return MATCH_ERROR;
4932
4933 /* Set interface. */
4934 if (proc_if != NULL)
4935 {
4936 if (sym->ts.type != BT_UNKNOWN)
4937 {
4938 gfc_error ("Procedure '%s' at %L already has basic type of %s",
4939 sym->name, &gfc_current_locus,
4940 gfc_basic_typename (sym->ts.type));
4941 return MATCH_ERROR;
4942 }
4943 sym->ts.interface = proc_if;
4944 sym->attr.untyped = 1;
4945 sym->attr.if_source = IFSRC_IFBODY;
4946 }
4947 else if (current_ts.type != BT_UNKNOWN)
4948 {
4949 if (gfc_add_type (sym, ¤t_ts, &gfc_current_locus) == FAILURE)
4950 return MATCH_ERROR;
4951 sym->ts.interface = gfc_new_symbol ("", gfc_current_ns);
4952 sym->ts.interface->ts = current_ts;
4953 sym->ts.interface->attr.flavor = FL_PROCEDURE;
4954 sym->ts.interface->attr.function = 1;
4955 sym->attr.function = 1;
4956 sym->attr.if_source = IFSRC_UNKNOWN;
4957 }
4958
4959 if (gfc_match (" =>") == MATCH_YES)
4960 {
4961 if (!current_attr.pointer)
4962 {
4963 gfc_error ("Initialization at %C isn't for a pointer variable");
4964 m = MATCH_ERROR;
4965 goto cleanup;
4966 }
4967
4968 m = match_pointer_init (&initializer, 1);
4969 if (m != MATCH_YES)
4970 goto cleanup;
4971
4972 if (add_init_expr_to_sym (sym->name, &initializer, &gfc_current_locus)
4973 != SUCCESS)
4974 goto cleanup;
4975
4976 }
4977
4978 if (gfc_match_eos () == MATCH_YES)
4979 return MATCH_YES;
4980 if (gfc_match_char (',') != MATCH_YES)
4981 goto syntax;
4982 }
4983
4984 syntax:
4985 gfc_error ("Syntax error in PROCEDURE statement at %C");
4986 return MATCH_ERROR;
4987
4988 cleanup:
4989 /* Free stuff up and return. */
4990 gfc_free_expr (initializer);
4991 return m;
4992 }
4993
4994
4995 static match
4996 match_binding_attributes (gfc_typebound_proc* ba, bool generic, bool ppc);
4997
4998
4999 /* Match a procedure pointer component declaration (R445). */
5000
5001 static match
match_ppc_decl(void)5002 match_ppc_decl (void)
5003 {
5004 match m;
5005 gfc_symbol *proc_if = NULL;
5006 gfc_typespec ts;
5007 int num;
5008 gfc_component *c;
5009 gfc_expr *initializer = NULL;
5010 gfc_typebound_proc* tb;
5011 char name[GFC_MAX_SYMBOL_LEN + 1];
5012
5013 /* Parse interface (with brackets). */
5014 m = match_procedure_interface (&proc_if);
5015 if (m != MATCH_YES)
5016 goto syntax;
5017
5018 /* Parse attributes. */
5019 tb = XCNEW (gfc_typebound_proc);
5020 tb->where = gfc_current_locus;
5021 m = match_binding_attributes (tb, false, true);
5022 if (m == MATCH_ERROR)
5023 return m;
5024
5025 gfc_clear_attr (¤t_attr);
5026 current_attr.procedure = 1;
5027 current_attr.proc_pointer = 1;
5028 current_attr.access = tb->access;
5029 current_attr.flavor = FL_PROCEDURE;
5030
5031 /* Match the colons (required). */
5032 if (gfc_match (" ::") != MATCH_YES)
5033 {
5034 gfc_error ("Expected '::' after binding-attributes at %C");
5035 return MATCH_ERROR;
5036 }
5037
5038 /* Check for C450. */
5039 if (!tb->nopass && proc_if == NULL)
5040 {
5041 gfc_error("NOPASS or explicit interface required at %C");
5042 return MATCH_ERROR;
5043 }
5044
5045 if (gfc_notify_std (GFC_STD_F2003, "Procedure pointer "
5046 "component at %C") == FAILURE)
5047 return MATCH_ERROR;
5048
5049 /* Match PPC names. */
5050 ts = current_ts;
5051 for(num=1;;num++)
5052 {
5053 m = gfc_match_name (name);
5054 if (m == MATCH_NO)
5055 goto syntax;
5056 else if (m == MATCH_ERROR)
5057 return m;
5058
5059 if (gfc_add_component (gfc_current_block (), name, &c) == FAILURE)
5060 return MATCH_ERROR;
5061
5062 /* Add current_attr to the symbol attributes. */
5063 if (gfc_copy_attr (&c->attr, ¤t_attr, NULL) == FAILURE)
5064 return MATCH_ERROR;
5065
5066 if (gfc_add_external (&c->attr, NULL) == FAILURE)
5067 return MATCH_ERROR;
5068
5069 if (gfc_add_proc (&c->attr, name, NULL) == FAILURE)
5070 return MATCH_ERROR;
5071
5072 c->tb = tb;
5073
5074 /* Set interface. */
5075 if (proc_if != NULL)
5076 {
5077 c->ts.interface = proc_if;
5078 c->attr.untyped = 1;
5079 c->attr.if_source = IFSRC_IFBODY;
5080 }
5081 else if (ts.type != BT_UNKNOWN)
5082 {
5083 c->ts = ts;
5084 c->ts.interface = gfc_new_symbol ("", gfc_current_ns);
5085 c->ts.interface->result = c->ts.interface;
5086 c->ts.interface->ts = ts;
5087 c->ts.interface->attr.flavor = FL_PROCEDURE;
5088 c->ts.interface->attr.function = 1;
5089 c->attr.function = 1;
5090 c->attr.if_source = IFSRC_UNKNOWN;
5091 }
5092
5093 if (gfc_match (" =>") == MATCH_YES)
5094 {
5095 m = match_pointer_init (&initializer, 1);
5096 if (m != MATCH_YES)
5097 {
5098 gfc_free_expr (initializer);
5099 return m;
5100 }
5101 c->initializer = initializer;
5102 }
5103
5104 if (gfc_match_eos () == MATCH_YES)
5105 return MATCH_YES;
5106 if (gfc_match_char (',') != MATCH_YES)
5107 goto syntax;
5108 }
5109
5110 syntax:
5111 gfc_error ("Syntax error in procedure pointer component at %C");
5112 return MATCH_ERROR;
5113 }
5114
5115
5116 /* Match a PROCEDURE declaration inside an interface (R1206). */
5117
5118 static match
match_procedure_in_interface(void)5119 match_procedure_in_interface (void)
5120 {
5121 match m;
5122 gfc_symbol *sym;
5123 char name[GFC_MAX_SYMBOL_LEN + 1];
5124 locus old_locus;
5125
5126 if (current_interface.type == INTERFACE_NAMELESS
5127 || current_interface.type == INTERFACE_ABSTRACT)
5128 {
5129 gfc_error ("PROCEDURE at %C must be in a generic interface");
5130 return MATCH_ERROR;
5131 }
5132
5133 /* Check if the F2008 optional double colon appears. */
5134 gfc_gobble_whitespace ();
5135 old_locus = gfc_current_locus;
5136 if (gfc_match ("::") == MATCH_YES)
5137 {
5138 if (gfc_notify_std (GFC_STD_F2008, "double colon in "
5139 "MODULE PROCEDURE statement at %L", &old_locus)
5140 == FAILURE)
5141 return MATCH_ERROR;
5142 }
5143 else
5144 gfc_current_locus = old_locus;
5145
5146 for(;;)
5147 {
5148 m = gfc_match_name (name);
5149 if (m == MATCH_NO)
5150 goto syntax;
5151 else if (m == MATCH_ERROR)
5152 return m;
5153 if (gfc_get_symbol (name, gfc_current_ns->parent, &sym))
5154 return MATCH_ERROR;
5155
5156 if (gfc_add_interface (sym) == FAILURE)
5157 return MATCH_ERROR;
5158
5159 if (gfc_match_eos () == MATCH_YES)
5160 break;
5161 if (gfc_match_char (',') != MATCH_YES)
5162 goto syntax;
5163 }
5164
5165 return MATCH_YES;
5166
5167 syntax:
5168 gfc_error ("Syntax error in PROCEDURE statement at %C");
5169 return MATCH_ERROR;
5170 }
5171
5172
5173 /* General matcher for PROCEDURE declarations. */
5174
5175 static match match_procedure_in_type (void);
5176
5177 match
gfc_match_procedure(void)5178 gfc_match_procedure (void)
5179 {
5180 match m;
5181
5182 switch (gfc_current_state ())
5183 {
5184 case COMP_NONE:
5185 case COMP_PROGRAM:
5186 case COMP_MODULE:
5187 case COMP_SUBROUTINE:
5188 case COMP_FUNCTION:
5189 case COMP_BLOCK:
5190 m = match_procedure_decl ();
5191 break;
5192 case COMP_INTERFACE:
5193 m = match_procedure_in_interface ();
5194 break;
5195 case COMP_DERIVED:
5196 m = match_ppc_decl ();
5197 break;
5198 case COMP_DERIVED_CONTAINS:
5199 m = match_procedure_in_type ();
5200 break;
5201 default:
5202 return MATCH_NO;
5203 }
5204
5205 if (m != MATCH_YES)
5206 return m;
5207
5208 if (gfc_notify_std (GFC_STD_F2003, "PROCEDURE statement at %C")
5209 == FAILURE)
5210 return MATCH_ERROR;
5211
5212 return m;
5213 }
5214
5215
5216 /* Warn if a matched procedure has the same name as an intrinsic; this is
5217 simply a wrapper around gfc_warn_intrinsic_shadow that interprets the current
5218 parser-state-stack to find out whether we're in a module. */
5219
5220 static void
warn_intrinsic_shadow(const gfc_symbol * sym,bool func)5221 warn_intrinsic_shadow (const gfc_symbol* sym, bool func)
5222 {
5223 bool in_module;
5224
5225 in_module = (gfc_state_stack->previous
5226 && gfc_state_stack->previous->state == COMP_MODULE);
5227
5228 gfc_warn_intrinsic_shadow (sym, in_module, func);
5229 }
5230
5231
5232 /* Match a function declaration. */
5233
5234 match
gfc_match_function_decl(void)5235 gfc_match_function_decl (void)
5236 {
5237 char name[GFC_MAX_SYMBOL_LEN + 1];
5238 gfc_symbol *sym, *result;
5239 locus old_loc;
5240 match m;
5241 match suffix_match;
5242 match found_match; /* Status returned by match func. */
5243
5244 if (gfc_current_state () != COMP_NONE
5245 && gfc_current_state () != COMP_INTERFACE
5246 && gfc_current_state () != COMP_CONTAINS)
5247 return MATCH_NO;
5248
5249 gfc_clear_ts (¤t_ts);
5250
5251 old_loc = gfc_current_locus;
5252
5253 m = gfc_match_prefix (¤t_ts);
5254 if (m != MATCH_YES)
5255 {
5256 gfc_current_locus = old_loc;
5257 return m;
5258 }
5259
5260 if (gfc_match ("function% %n", name) != MATCH_YES)
5261 {
5262 gfc_current_locus = old_loc;
5263 return MATCH_NO;
5264 }
5265 if (get_proc_name (name, &sym, false))
5266 return MATCH_ERROR;
5267
5268 if (add_hidden_procptr_result (sym) == SUCCESS)
5269 sym = sym->result;
5270
5271 gfc_new_block = sym;
5272
5273 m = gfc_match_formal_arglist (sym, 0, 0);
5274 if (m == MATCH_NO)
5275 {
5276 gfc_error ("Expected formal argument list in function "
5277 "definition at %C");
5278 m = MATCH_ERROR;
5279 goto cleanup;
5280 }
5281 else if (m == MATCH_ERROR)
5282 goto cleanup;
5283
5284 result = NULL;
5285
5286 /* According to the draft, the bind(c) and result clause can
5287 come in either order after the formal_arg_list (i.e., either
5288 can be first, both can exist together or by themselves or neither
5289 one). Therefore, the match_result can't match the end of the
5290 string, and check for the bind(c) or result clause in either order. */
5291 found_match = gfc_match_eos ();
5292
5293 /* Make sure that it isn't already declared as BIND(C). If it is, it
5294 must have been marked BIND(C) with a BIND(C) attribute and that is
5295 not allowed for procedures. */
5296 if (sym->attr.is_bind_c == 1)
5297 {
5298 sym->attr.is_bind_c = 0;
5299 if (sym->old_symbol != NULL)
5300 gfc_error_now ("BIND(C) attribute at %L can only be used for "
5301 "variables or common blocks",
5302 &(sym->old_symbol->declared_at));
5303 else
5304 gfc_error_now ("BIND(C) attribute at %L can only be used for "
5305 "variables or common blocks", &gfc_current_locus);
5306 }
5307
5308 if (found_match != MATCH_YES)
5309 {
5310 /* If we haven't found the end-of-statement, look for a suffix. */
5311 suffix_match = gfc_match_suffix (sym, &result);
5312 if (suffix_match == MATCH_YES)
5313 /* Need to get the eos now. */
5314 found_match = gfc_match_eos ();
5315 else
5316 found_match = suffix_match;
5317 }
5318
5319 if(found_match != MATCH_YES)
5320 m = MATCH_ERROR;
5321 else
5322 {
5323 /* Make changes to the symbol. */
5324 m = MATCH_ERROR;
5325
5326 if (gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
5327 goto cleanup;
5328
5329 if (gfc_missing_attr (&sym->attr, NULL) == FAILURE
5330 || copy_prefix (&sym->attr, &sym->declared_at) == FAILURE)
5331 goto cleanup;
5332
5333 /* Delay matching the function characteristics until after the
5334 specification block by signalling kind=-1. */
5335 sym->declared_at = old_loc;
5336 if (current_ts.type != BT_UNKNOWN)
5337 current_ts.kind = -1;
5338 else
5339 current_ts.kind = 0;
5340
5341 if (result == NULL)
5342 {
5343 if (current_ts.type != BT_UNKNOWN
5344 && gfc_add_type (sym, ¤t_ts, &gfc_current_locus) == FAILURE)
5345 goto cleanup;
5346 sym->result = sym;
5347 }
5348 else
5349 {
5350 if (current_ts.type != BT_UNKNOWN
5351 && gfc_add_type (result, ¤t_ts, &gfc_current_locus)
5352 == FAILURE)
5353 goto cleanup;
5354 sym->result = result;
5355 }
5356
5357 /* Warn if this procedure has the same name as an intrinsic. */
5358 warn_intrinsic_shadow (sym, true);
5359
5360 return MATCH_YES;
5361 }
5362
5363 cleanup:
5364 gfc_current_locus = old_loc;
5365 return m;
5366 }
5367
5368
5369 /* This is mostly a copy of parse.c(add_global_procedure) but modified to
5370 pass the name of the entry, rather than the gfc_current_block name, and
5371 to return false upon finding an existing global entry. */
5372
5373 static bool
add_global_entry(const char * name,int sub)5374 add_global_entry (const char *name, int sub)
5375 {
5376 gfc_gsymbol *s;
5377 enum gfc_symbol_type type;
5378
5379 s = gfc_get_gsymbol(name);
5380 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
5381
5382 if (s->defined
5383 || (s->type != GSYM_UNKNOWN
5384 && s->type != type))
5385 gfc_global_used(s, NULL);
5386 else
5387 {
5388 s->type = type;
5389 s->where = gfc_current_locus;
5390 s->defined = 1;
5391 s->ns = gfc_current_ns;
5392 return true;
5393 }
5394 return false;
5395 }
5396
5397
5398 /* Match an ENTRY statement. */
5399
5400 match
gfc_match_entry(void)5401 gfc_match_entry (void)
5402 {
5403 gfc_symbol *proc;
5404 gfc_symbol *result;
5405 gfc_symbol *entry;
5406 char name[GFC_MAX_SYMBOL_LEN + 1];
5407 gfc_compile_state state;
5408 match m;
5409 gfc_entry_list *el;
5410 locus old_loc;
5411 bool module_procedure;
5412 char peek_char;
5413 match is_bind_c;
5414
5415 m = gfc_match_name (name);
5416 if (m != MATCH_YES)
5417 return m;
5418
5419 if (gfc_notify_std (GFC_STD_F2008_OBS,
5420 "ENTRY statement at %C") == FAILURE)
5421 return MATCH_ERROR;
5422
5423 state = gfc_current_state ();
5424 if (state != COMP_SUBROUTINE && state != COMP_FUNCTION)
5425 {
5426 switch (state)
5427 {
5428 case COMP_PROGRAM:
5429 gfc_error ("ENTRY statement at %C cannot appear within a PROGRAM");
5430 break;
5431 case COMP_MODULE:
5432 gfc_error ("ENTRY statement at %C cannot appear within a MODULE");
5433 break;
5434 case COMP_BLOCK_DATA:
5435 gfc_error ("ENTRY statement at %C cannot appear within "
5436 "a BLOCK DATA");
5437 break;
5438 case COMP_INTERFACE:
5439 gfc_error ("ENTRY statement at %C cannot appear within "
5440 "an INTERFACE");
5441 break;
5442 case COMP_DERIVED:
5443 gfc_error ("ENTRY statement at %C cannot appear within "
5444 "a DERIVED TYPE block");
5445 break;
5446 case COMP_IF:
5447 gfc_error ("ENTRY statement at %C cannot appear within "
5448 "an IF-THEN block");
5449 break;
5450 case COMP_DO:
5451 case COMP_DO_CONCURRENT:
5452 gfc_error ("ENTRY statement at %C cannot appear within "
5453 "a DO block");
5454 break;
5455 case COMP_SELECT:
5456 gfc_error ("ENTRY statement at %C cannot appear within "
5457 "a SELECT block");
5458 break;
5459 case COMP_FORALL:
5460 gfc_error ("ENTRY statement at %C cannot appear within "
5461 "a FORALL block");
5462 break;
5463 case COMP_WHERE:
5464 gfc_error ("ENTRY statement at %C cannot appear within "
5465 "a WHERE block");
5466 break;
5467 case COMP_CONTAINS:
5468 gfc_error ("ENTRY statement at %C cannot appear within "
5469 "a contained subprogram");
5470 break;
5471 default:
5472 gfc_internal_error ("gfc_match_entry(): Bad state");
5473 }
5474 return MATCH_ERROR;
5475 }
5476
5477 module_procedure = gfc_current_ns->parent != NULL
5478 && gfc_current_ns->parent->proc_name
5479 && gfc_current_ns->parent->proc_name->attr.flavor
5480 == FL_MODULE;
5481
5482 if (gfc_current_ns->parent != NULL
5483 && gfc_current_ns->parent->proc_name
5484 && !module_procedure)
5485 {
5486 gfc_error("ENTRY statement at %C cannot appear in a "
5487 "contained procedure");
5488 return MATCH_ERROR;
5489 }
5490
5491 /* Module function entries need special care in get_proc_name
5492 because previous references within the function will have
5493 created symbols attached to the current namespace. */
5494 if (get_proc_name (name, &entry,
5495 gfc_current_ns->parent != NULL
5496 && module_procedure))
5497 return MATCH_ERROR;
5498
5499 proc = gfc_current_block ();
5500
5501 /* Make sure that it isn't already declared as BIND(C). If it is, it
5502 must have been marked BIND(C) with a BIND(C) attribute and that is
5503 not allowed for procedures. */
5504 if (entry->attr.is_bind_c == 1)
5505 {
5506 entry->attr.is_bind_c = 0;
5507 if (entry->old_symbol != NULL)
5508 gfc_error_now ("BIND(C) attribute at %L can only be used for "
5509 "variables or common blocks",
5510 &(entry->old_symbol->declared_at));
5511 else
5512 gfc_error_now ("BIND(C) attribute at %L can only be used for "
5513 "variables or common blocks", &gfc_current_locus);
5514 }
5515
5516 /* Check what next non-whitespace character is so we can tell if there
5517 is the required parens if we have a BIND(C). */
5518 gfc_gobble_whitespace ();
5519 peek_char = gfc_peek_ascii_char ();
5520
5521 if (state == COMP_SUBROUTINE)
5522 {
5523 /* An entry in a subroutine. */
5524 if (!gfc_current_ns->parent && !add_global_entry (name, 1))
5525 return MATCH_ERROR;
5526
5527 m = gfc_match_formal_arglist (entry, 0, 1);
5528 if (m != MATCH_YES)
5529 return MATCH_ERROR;
5530
5531 /* Call gfc_match_bind_c with allow_binding_name = true as ENTRY can
5532 never be an internal procedure. */
5533 is_bind_c = gfc_match_bind_c (entry, true);
5534 if (is_bind_c == MATCH_ERROR)
5535 return MATCH_ERROR;
5536 if (is_bind_c == MATCH_YES)
5537 {
5538 if (peek_char != '(')
5539 {
5540 gfc_error ("Missing required parentheses before BIND(C) at %C");
5541 return MATCH_ERROR;
5542 }
5543 if (gfc_add_is_bind_c (&(entry->attr), entry->name, &(entry->declared_at), 1)
5544 == FAILURE)
5545 return MATCH_ERROR;
5546 }
5547
5548 if (gfc_add_entry (&entry->attr, entry->name, NULL) == FAILURE
5549 || gfc_add_subroutine (&entry->attr, entry->name, NULL) == FAILURE)
5550 return MATCH_ERROR;
5551 }
5552 else
5553 {
5554 /* An entry in a function.
5555 We need to take special care because writing
5556 ENTRY f()
5557 as
5558 ENTRY f
5559 is allowed, whereas
5560 ENTRY f() RESULT (r)
5561 can't be written as
5562 ENTRY f RESULT (r). */
5563 if (!gfc_current_ns->parent && !add_global_entry (name, 0))
5564 return MATCH_ERROR;
5565
5566 old_loc = gfc_current_locus;
5567 if (gfc_match_eos () == MATCH_YES)
5568 {
5569 gfc_current_locus = old_loc;
5570 /* Match the empty argument list, and add the interface to
5571 the symbol. */
5572 m = gfc_match_formal_arglist (entry, 0, 1);
5573 }
5574 else
5575 m = gfc_match_formal_arglist (entry, 0, 0);
5576
5577 if (m != MATCH_YES)
5578 return MATCH_ERROR;
5579
5580 result = NULL;
5581
5582 if (gfc_match_eos () == MATCH_YES)
5583 {
5584 if (gfc_add_entry (&entry->attr, entry->name, NULL) == FAILURE
5585 || gfc_add_function (&entry->attr, entry->name, NULL) == FAILURE)
5586 return MATCH_ERROR;
5587
5588 entry->result = entry;
5589 }
5590 else
5591 {
5592 m = gfc_match_suffix (entry, &result);
5593 if (m == MATCH_NO)
5594 gfc_syntax_error (ST_ENTRY);
5595 if (m != MATCH_YES)
5596 return MATCH_ERROR;
5597
5598 if (result)
5599 {
5600 if (gfc_add_result (&result->attr, result->name, NULL) == FAILURE
5601 || gfc_add_entry (&entry->attr, result->name, NULL) == FAILURE
5602 || gfc_add_function (&entry->attr, result->name, NULL)
5603 == FAILURE)
5604 return MATCH_ERROR;
5605 entry->result = result;
5606 }
5607 else
5608 {
5609 if (gfc_add_entry (&entry->attr, entry->name, NULL) == FAILURE
5610 || gfc_add_function (&entry->attr, entry->name, NULL) == FAILURE)
5611 return MATCH_ERROR;
5612 entry->result = entry;
5613 }
5614 }
5615 }
5616
5617 if (gfc_match_eos () != MATCH_YES)
5618 {
5619 gfc_syntax_error (ST_ENTRY);
5620 return MATCH_ERROR;
5621 }
5622
5623 entry->attr.recursive = proc->attr.recursive;
5624 entry->attr.elemental = proc->attr.elemental;
5625 entry->attr.pure = proc->attr.pure;
5626
5627 el = gfc_get_entry_list ();
5628 el->sym = entry;
5629 el->next = gfc_current_ns->entries;
5630 gfc_current_ns->entries = el;
5631 if (el->next)
5632 el->id = el->next->id + 1;
5633 else
5634 el->id = 1;
5635
5636 new_st.op = EXEC_ENTRY;
5637 new_st.ext.entry = el;
5638
5639 return MATCH_YES;
5640 }
5641
5642
5643 /* Match a subroutine statement, including optional prefixes. */
5644
5645 match
gfc_match_subroutine(void)5646 gfc_match_subroutine (void)
5647 {
5648 char name[GFC_MAX_SYMBOL_LEN + 1];
5649 gfc_symbol *sym;
5650 match m;
5651 match is_bind_c;
5652 char peek_char;
5653 bool allow_binding_name;
5654
5655 if (gfc_current_state () != COMP_NONE
5656 && gfc_current_state () != COMP_INTERFACE
5657 && gfc_current_state () != COMP_CONTAINS)
5658 return MATCH_NO;
5659
5660 m = gfc_match_prefix (NULL);
5661 if (m != MATCH_YES)
5662 return m;
5663
5664 m = gfc_match ("subroutine% %n", name);
5665 if (m != MATCH_YES)
5666 return m;
5667
5668 if (get_proc_name (name, &sym, false))
5669 return MATCH_ERROR;
5670
5671 /* Set declared_at as it might point to, e.g., a PUBLIC statement, if
5672 the symbol existed before. */
5673 sym->declared_at = gfc_current_locus;
5674
5675 if (add_hidden_procptr_result (sym) == SUCCESS)
5676 sym = sym->result;
5677
5678 gfc_new_block = sym;
5679
5680 /* Check what next non-whitespace character is so we can tell if there
5681 is the required parens if we have a BIND(C). */
5682 gfc_gobble_whitespace ();
5683 peek_char = gfc_peek_ascii_char ();
5684
5685 if (gfc_add_subroutine (&sym->attr, sym->name, NULL) == FAILURE)
5686 return MATCH_ERROR;
5687
5688 if (gfc_match_formal_arglist (sym, 0, 1) != MATCH_YES)
5689 return MATCH_ERROR;
5690
5691 /* Make sure that it isn't already declared as BIND(C). If it is, it
5692 must have been marked BIND(C) with a BIND(C) attribute and that is
5693 not allowed for procedures. */
5694 if (sym->attr.is_bind_c == 1)
5695 {
5696 sym->attr.is_bind_c = 0;
5697 if (sym->old_symbol != NULL)
5698 gfc_error_now ("BIND(C) attribute at %L can only be used for "
5699 "variables or common blocks",
5700 &(sym->old_symbol->declared_at));
5701 else
5702 gfc_error_now ("BIND(C) attribute at %L can only be used for "
5703 "variables or common blocks", &gfc_current_locus);
5704 }
5705
5706 /* C binding names are not allowed for internal procedures. */
5707 if (gfc_current_state () == COMP_CONTAINS
5708 && sym->ns->proc_name->attr.flavor != FL_MODULE)
5709 allow_binding_name = false;
5710 else
5711 allow_binding_name = true;
5712
5713 /* Here, we are just checking if it has the bind(c) attribute, and if
5714 so, then we need to make sure it's all correct. If it doesn't,
5715 we still need to continue matching the rest of the subroutine line. */
5716 is_bind_c = gfc_match_bind_c (sym, allow_binding_name);
5717 if (is_bind_c == MATCH_ERROR)
5718 {
5719 /* There was an attempt at the bind(c), but it was wrong. An
5720 error message should have been printed w/in the gfc_match_bind_c
5721 so here we'll just return the MATCH_ERROR. */
5722 return MATCH_ERROR;
5723 }
5724
5725 if (is_bind_c == MATCH_YES)
5726 {
5727 /* The following is allowed in the Fortran 2008 draft. */
5728 if (gfc_current_state () == COMP_CONTAINS
5729 && sym->ns->proc_name->attr.flavor != FL_MODULE
5730 && gfc_notify_std (GFC_STD_F2008, "BIND(C) attribute "
5731 "at %L may not be specified for an internal "
5732 "procedure", &gfc_current_locus)
5733 == FAILURE)
5734 return MATCH_ERROR;
5735
5736 if (peek_char != '(')
5737 {
5738 gfc_error ("Missing required parentheses before BIND(C) at %C");
5739 return MATCH_ERROR;
5740 }
5741 if (gfc_add_is_bind_c (&(sym->attr), sym->name, &(sym->declared_at), 1)
5742 == FAILURE)
5743 return MATCH_ERROR;
5744 }
5745
5746 if (gfc_match_eos () != MATCH_YES)
5747 {
5748 gfc_syntax_error (ST_SUBROUTINE);
5749 return MATCH_ERROR;
5750 }
5751
5752 if (copy_prefix (&sym->attr, &sym->declared_at) == FAILURE)
5753 return MATCH_ERROR;
5754
5755 /* Warn if it has the same name as an intrinsic. */
5756 warn_intrinsic_shadow (sym, false);
5757
5758 return MATCH_YES;
5759 }
5760
5761
5762 /* Match a BIND(C) specifier, with the optional 'name=' specifier if
5763 given, and set the binding label in either the given symbol (if not
5764 NULL), or in the current_ts. The symbol may be NULL because we may
5765 encounter the BIND(C) before the declaration itself. Return
5766 MATCH_NO if what we're looking at isn't a BIND(C) specifier,
5767 MATCH_ERROR if it is a BIND(C) clause but an error was encountered,
5768 or MATCH_YES if the specifier was correct and the binding label and
5769 bind(c) fields were set correctly for the given symbol or the
5770 current_ts. If allow_binding_name is false, no binding name may be
5771 given. */
5772
5773 match
gfc_match_bind_c(gfc_symbol * sym,bool allow_binding_name)5774 gfc_match_bind_c (gfc_symbol *sym, bool allow_binding_name)
5775 {
5776 /* binding label, if exists */
5777 const char* binding_label = NULL;
5778 match double_quote;
5779 match single_quote;
5780
5781 /* Initialize the flag that specifies whether we encountered a NAME=
5782 specifier or not. */
5783 has_name_equals = 0;
5784
5785 /* This much we have to be able to match, in this order, if
5786 there is a bind(c) label. */
5787 if (gfc_match (" bind ( c ") != MATCH_YES)
5788 return MATCH_NO;
5789
5790 /* Now see if there is a binding label, or if we've reached the
5791 end of the bind(c) attribute without one. */
5792 if (gfc_match_char (',') == MATCH_YES)
5793 {
5794 if (gfc_match (" name = ") != MATCH_YES)
5795 {
5796 gfc_error ("Syntax error in NAME= specifier for binding label "
5797 "at %C");
5798 /* should give an error message here */
5799 return MATCH_ERROR;
5800 }
5801
5802 has_name_equals = 1;
5803
5804 /* Get the opening quote. */
5805 double_quote = MATCH_YES;
5806 single_quote = MATCH_YES;
5807 double_quote = gfc_match_char ('"');
5808 if (double_quote != MATCH_YES)
5809 single_quote = gfc_match_char ('\'');
5810 if (double_quote != MATCH_YES && single_quote != MATCH_YES)
5811 {
5812 gfc_error ("Syntax error in NAME= specifier for binding label "
5813 "at %C");
5814 return MATCH_ERROR;
5815 }
5816
5817 /* Grab the binding label, using functions that will not lower
5818 case the names automatically. */
5819 if (gfc_match_name_C (&binding_label) != MATCH_YES)
5820 return MATCH_ERROR;
5821
5822 /* Get the closing quotation. */
5823 if (double_quote == MATCH_YES)
5824 {
5825 if (gfc_match_char ('"') != MATCH_YES)
5826 {
5827 gfc_error ("Missing closing quote '\"' for binding label at %C");
5828 /* User started string with '"' so looked to match it. */
5829 return MATCH_ERROR;
5830 }
5831 }
5832 else
5833 {
5834 if (gfc_match_char ('\'') != MATCH_YES)
5835 {
5836 gfc_error ("Missing closing quote '\'' for binding label at %C");
5837 /* User started string with "'" char. */
5838 return MATCH_ERROR;
5839 }
5840 }
5841 }
5842
5843 /* Get the required right paren. */
5844 if (gfc_match_char (')') != MATCH_YES)
5845 {
5846 gfc_error ("Missing closing paren for binding label at %C");
5847 return MATCH_ERROR;
5848 }
5849
5850 if (has_name_equals && !allow_binding_name)
5851 {
5852 gfc_error ("No binding name is allowed in BIND(C) at %C");
5853 return MATCH_ERROR;
5854 }
5855
5856 if (has_name_equals && sym != NULL && sym->attr.dummy)
5857 {
5858 gfc_error ("For dummy procedure %s, no binding name is "
5859 "allowed in BIND(C) at %C", sym->name);
5860 return MATCH_ERROR;
5861 }
5862
5863
5864 /* Save the binding label to the symbol. If sym is null, we're
5865 probably matching the typespec attributes of a declaration and
5866 haven't gotten the name yet, and therefore, no symbol yet. */
5867 if (binding_label)
5868 {
5869 if (sym != NULL)
5870 sym->binding_label = binding_label;
5871 else
5872 curr_binding_label = binding_label;
5873 }
5874 else if (allow_binding_name)
5875 {
5876 /* No binding label, but if symbol isn't null, we
5877 can set the label for it here.
5878 If name="" or allow_binding_name is false, no C binding name is
5879 created. */
5880 if (sym != NULL && sym->name != NULL && has_name_equals == 0)
5881 sym->binding_label = IDENTIFIER_POINTER (get_identifier (sym->name));
5882 }
5883
5884 if (has_name_equals && gfc_current_state () == COMP_INTERFACE
5885 && current_interface.type == INTERFACE_ABSTRACT)
5886 {
5887 gfc_error ("NAME not allowed on BIND(C) for ABSTRACT INTERFACE at %C");
5888 return MATCH_ERROR;
5889 }
5890
5891 return MATCH_YES;
5892 }
5893
5894
5895 /* Return nonzero if we're currently compiling a contained procedure. */
5896
5897 static int
contained_procedure(void)5898 contained_procedure (void)
5899 {
5900 gfc_state_data *s = gfc_state_stack;
5901
5902 if ((s->state == COMP_SUBROUTINE || s->state == COMP_FUNCTION)
5903 && s->previous != NULL && s->previous->state == COMP_CONTAINS)
5904 return 1;
5905
5906 return 0;
5907 }
5908
5909 /* Set the kind of each enumerator. The kind is selected such that it is
5910 interoperable with the corresponding C enumeration type, making
5911 sure that -fshort-enums is honored. */
5912
5913 static void
set_enum_kind(void)5914 set_enum_kind(void)
5915 {
5916 enumerator_history *current_history = NULL;
5917 int kind;
5918 int i;
5919
5920 if (max_enum == NULL || enum_history == NULL)
5921 return;
5922
5923 if (!flag_short_enums)
5924 return;
5925
5926 i = 0;
5927 do
5928 {
5929 kind = gfc_integer_kinds[i++].kind;
5930 }
5931 while (kind < gfc_c_int_kind
5932 && gfc_check_integer_range (max_enum->initializer->value.integer,
5933 kind) != ARITH_OK);
5934
5935 current_history = enum_history;
5936 while (current_history != NULL)
5937 {
5938 current_history->sym->ts.kind = kind;
5939 current_history = current_history->next;
5940 }
5941 }
5942
5943
5944 /* Match any of the various end-block statements. Returns the type of
5945 END to the caller. The END INTERFACE, END IF, END DO, END SELECT
5946 and END BLOCK statements cannot be replaced by a single END statement. */
5947
5948 match
gfc_match_end(gfc_statement * st)5949 gfc_match_end (gfc_statement *st)
5950 {
5951 char name[GFC_MAX_SYMBOL_LEN + 1];
5952 gfc_compile_state state;
5953 locus old_loc;
5954 const char *block_name;
5955 const char *target;
5956 int eos_ok;
5957 match m;
5958 gfc_namespace *parent_ns, *ns, *prev_ns;
5959 gfc_namespace **nsp;
5960
5961 old_loc = gfc_current_locus;
5962 if (gfc_match ("end") != MATCH_YES)
5963 return MATCH_NO;
5964
5965 state = gfc_current_state ();
5966 block_name = gfc_current_block () == NULL
5967 ? NULL : gfc_current_block ()->name;
5968
5969 switch (state)
5970 {
5971 case COMP_ASSOCIATE:
5972 case COMP_BLOCK:
5973 if (!strncmp (block_name, "block@", strlen("block@")))
5974 block_name = NULL;
5975 break;
5976
5977 case COMP_CONTAINS:
5978 case COMP_DERIVED_CONTAINS:
5979 state = gfc_state_stack->previous->state;
5980 block_name = gfc_state_stack->previous->sym == NULL
5981 ? NULL : gfc_state_stack->previous->sym->name;
5982 break;
5983
5984 default:
5985 break;
5986 }
5987
5988 switch (state)
5989 {
5990 case COMP_NONE:
5991 case COMP_PROGRAM:
5992 *st = ST_END_PROGRAM;
5993 target = " program";
5994 eos_ok = 1;
5995 break;
5996
5997 case COMP_SUBROUTINE:
5998 *st = ST_END_SUBROUTINE;
5999 target = " subroutine";
6000 eos_ok = !contained_procedure ();
6001 break;
6002
6003 case COMP_FUNCTION:
6004 *st = ST_END_FUNCTION;
6005 target = " function";
6006 eos_ok = !contained_procedure ();
6007 break;
6008
6009 case COMP_BLOCK_DATA:
6010 *st = ST_END_BLOCK_DATA;
6011 target = " block data";
6012 eos_ok = 1;
6013 break;
6014
6015 case COMP_MODULE:
6016 *st = ST_END_MODULE;
6017 target = " module";
6018 eos_ok = 1;
6019 break;
6020
6021 case COMP_INTERFACE:
6022 *st = ST_END_INTERFACE;
6023 target = " interface";
6024 eos_ok = 0;
6025 break;
6026
6027 case COMP_DERIVED:
6028 case COMP_DERIVED_CONTAINS:
6029 *st = ST_END_TYPE;
6030 target = " type";
6031 eos_ok = 0;
6032 break;
6033
6034 case COMP_ASSOCIATE:
6035 *st = ST_END_ASSOCIATE;
6036 target = " associate";
6037 eos_ok = 0;
6038 break;
6039
6040 case COMP_BLOCK:
6041 *st = ST_END_BLOCK;
6042 target = " block";
6043 eos_ok = 0;
6044 break;
6045
6046 case COMP_IF:
6047 *st = ST_ENDIF;
6048 target = " if";
6049 eos_ok = 0;
6050 break;
6051
6052 case COMP_DO:
6053 case COMP_DO_CONCURRENT:
6054 *st = ST_ENDDO;
6055 target = " do";
6056 eos_ok = 0;
6057 break;
6058
6059 case COMP_CRITICAL:
6060 *st = ST_END_CRITICAL;
6061 target = " critical";
6062 eos_ok = 0;
6063 break;
6064
6065 case COMP_SELECT:
6066 case COMP_SELECT_TYPE:
6067 *st = ST_END_SELECT;
6068 target = " select";
6069 eos_ok = 0;
6070 break;
6071
6072 case COMP_FORALL:
6073 *st = ST_END_FORALL;
6074 target = " forall";
6075 eos_ok = 0;
6076 break;
6077
6078 case COMP_WHERE:
6079 *st = ST_END_WHERE;
6080 target = " where";
6081 eos_ok = 0;
6082 break;
6083
6084 case COMP_ENUM:
6085 *st = ST_END_ENUM;
6086 target = " enum";
6087 eos_ok = 0;
6088 last_initializer = NULL;
6089 set_enum_kind ();
6090 gfc_free_enum_history ();
6091 break;
6092
6093 default:
6094 gfc_error ("Unexpected END statement at %C");
6095 goto cleanup;
6096 }
6097
6098 if (gfc_match_eos () == MATCH_YES)
6099 {
6100 if (!eos_ok && (*st == ST_END_SUBROUTINE || *st == ST_END_FUNCTION))
6101 {
6102 if (gfc_notify_std (GFC_STD_F2008, "END statement "
6103 "instead of %s statement at %L",
6104 gfc_ascii_statement (*st), &old_loc) == FAILURE)
6105 goto cleanup;
6106 }
6107 else if (!eos_ok)
6108 {
6109 /* We would have required END [something]. */
6110 gfc_error ("%s statement expected at %L",
6111 gfc_ascii_statement (*st), &old_loc);
6112 goto cleanup;
6113 }
6114
6115 return MATCH_YES;
6116 }
6117
6118 /* Verify that we've got the sort of end-block that we're expecting. */
6119 if (gfc_match (target) != MATCH_YES)
6120 {
6121 gfc_error ("Expecting %s statement at %C", gfc_ascii_statement (*st));
6122 goto cleanup;
6123 }
6124
6125 /* If we're at the end, make sure a block name wasn't required. */
6126 if (gfc_match_eos () == MATCH_YES)
6127 {
6128
6129 if (*st != ST_ENDDO && *st != ST_ENDIF && *st != ST_END_SELECT
6130 && *st != ST_END_FORALL && *st != ST_END_WHERE && *st != ST_END_BLOCK
6131 && *st != ST_END_ASSOCIATE && *st != ST_END_CRITICAL)
6132 return MATCH_YES;
6133
6134 if (!block_name)
6135 return MATCH_YES;
6136
6137 gfc_error ("Expected block name of '%s' in %s statement at %C",
6138 block_name, gfc_ascii_statement (*st));
6139
6140 return MATCH_ERROR;
6141 }
6142
6143 /* END INTERFACE has a special handler for its several possible endings. */
6144 if (*st == ST_END_INTERFACE)
6145 return gfc_match_end_interface ();
6146
6147 /* We haven't hit the end of statement, so what is left must be an
6148 end-name. */
6149 m = gfc_match_space ();
6150 if (m == MATCH_YES)
6151 m = gfc_match_name (name);
6152
6153 if (m == MATCH_NO)
6154 gfc_error ("Expected terminating name at %C");
6155 if (m != MATCH_YES)
6156 goto cleanup;
6157
6158 if (block_name == NULL)
6159 goto syntax;
6160
6161 if (strcmp (name, block_name) != 0 && strcmp (block_name, "ppr@") != 0)
6162 {
6163 gfc_error ("Expected label '%s' for %s statement at %C", block_name,
6164 gfc_ascii_statement (*st));
6165 goto cleanup;
6166 }
6167 /* Procedure pointer as function result. */
6168 else if (strcmp (block_name, "ppr@") == 0
6169 && strcmp (name, gfc_current_block ()->ns->proc_name->name) != 0)
6170 {
6171 gfc_error ("Expected label '%s' for %s statement at %C",
6172 gfc_current_block ()->ns->proc_name->name,
6173 gfc_ascii_statement (*st));
6174 goto cleanup;
6175 }
6176
6177 if (gfc_match_eos () == MATCH_YES)
6178 return MATCH_YES;
6179
6180 syntax:
6181 gfc_syntax_error (*st);
6182
6183 cleanup:
6184 gfc_current_locus = old_loc;
6185
6186 /* If we are missing an END BLOCK, we created a half-ready namespace.
6187 Remove it from the parent namespace's sibling list. */
6188
6189 if (state == COMP_BLOCK)
6190 {
6191 parent_ns = gfc_current_ns->parent;
6192
6193 nsp = &(gfc_state_stack->previous->tail->ext.block.ns);
6194
6195 prev_ns = NULL;
6196 ns = *nsp;
6197 while (ns)
6198 {
6199 if (ns == gfc_current_ns)
6200 {
6201 if (prev_ns == NULL)
6202 *nsp = NULL;
6203 else
6204 prev_ns->sibling = ns->sibling;
6205 }
6206 prev_ns = ns;
6207 ns = ns->sibling;
6208 }
6209
6210 gfc_free_namespace (gfc_current_ns);
6211 gfc_current_ns = parent_ns;
6212 }
6213
6214 return MATCH_ERROR;
6215 }
6216
6217
6218
6219 /***************** Attribute declaration statements ****************/
6220
6221 /* Set the attribute of a single variable. */
6222
6223 static match
attr_decl1(void)6224 attr_decl1 (void)
6225 {
6226 char name[GFC_MAX_SYMBOL_LEN + 1];
6227 gfc_array_spec *as;
6228 gfc_symbol *sym;
6229 locus var_locus;
6230 match m;
6231
6232 as = NULL;
6233
6234 m = gfc_match_name (name);
6235 if (m != MATCH_YES)
6236 goto cleanup;
6237
6238 if (find_special (name, &sym, false))
6239 return MATCH_ERROR;
6240
6241 if (check_function_name (name) == FAILURE)
6242 {
6243 m = MATCH_ERROR;
6244 goto cleanup;
6245 }
6246
6247 var_locus = gfc_current_locus;
6248
6249 /* Deal with possible array specification for certain attributes. */
6250 if (current_attr.dimension
6251 || current_attr.codimension
6252 || current_attr.allocatable
6253 || current_attr.pointer
6254 || current_attr.target)
6255 {
6256 m = gfc_match_array_spec (&as, !current_attr.codimension,
6257 !current_attr.dimension
6258 && !current_attr.pointer
6259 && !current_attr.target);
6260 if (m == MATCH_ERROR)
6261 goto cleanup;
6262
6263 if (current_attr.dimension && m == MATCH_NO)
6264 {
6265 gfc_error ("Missing array specification at %L in DIMENSION "
6266 "statement", &var_locus);
6267 m = MATCH_ERROR;
6268 goto cleanup;
6269 }
6270
6271 if (current_attr.dimension && sym->value)
6272 {
6273 gfc_error ("Dimensions specified for %s at %L after its "
6274 "initialisation", sym->name, &var_locus);
6275 m = MATCH_ERROR;
6276 goto cleanup;
6277 }
6278
6279 if (current_attr.codimension && m == MATCH_NO)
6280 {
6281 gfc_error ("Missing array specification at %L in CODIMENSION "
6282 "statement", &var_locus);
6283 m = MATCH_ERROR;
6284 goto cleanup;
6285 }
6286
6287 if ((current_attr.allocatable || current_attr.pointer)
6288 && (m == MATCH_YES) && (as->type != AS_DEFERRED))
6289 {
6290 gfc_error ("Array specification must be deferred at %L", &var_locus);
6291 m = MATCH_ERROR;
6292 goto cleanup;
6293 }
6294 }
6295
6296 /* Update symbol table. DIMENSION attribute is set in
6297 gfc_set_array_spec(). For CLASS variables, this must be applied
6298 to the first component, or '_data' field. */
6299 if (sym->ts.type == BT_CLASS && sym->ts.u.derived->attr.is_class)
6300 {
6301 if (gfc_copy_attr (&CLASS_DATA (sym)->attr, ¤t_attr, &var_locus)
6302 == FAILURE)
6303 {
6304 m = MATCH_ERROR;
6305 goto cleanup;
6306 }
6307 }
6308 else
6309 {
6310 if (current_attr.dimension == 0 && current_attr.codimension == 0
6311 && gfc_copy_attr (&sym->attr, ¤t_attr, &var_locus) == FAILURE)
6312 {
6313 m = MATCH_ERROR;
6314 goto cleanup;
6315 }
6316 }
6317
6318 if (sym->ts.type == BT_CLASS
6319 && gfc_build_class_symbol (&sym->ts, &sym->attr, &sym->as, false) == FAILURE)
6320 {
6321 m = MATCH_ERROR;
6322 goto cleanup;
6323 }
6324
6325 if (gfc_set_array_spec (sym, as, &var_locus) == FAILURE)
6326 {
6327 m = MATCH_ERROR;
6328 goto cleanup;
6329 }
6330
6331 if (sym->attr.cray_pointee && sym->as != NULL)
6332 {
6333 /* Fix the array spec. */
6334 m = gfc_mod_pointee_as (sym->as);
6335 if (m == MATCH_ERROR)
6336 goto cleanup;
6337 }
6338
6339 if (gfc_add_attribute (&sym->attr, &var_locus) == FAILURE)
6340 {
6341 m = MATCH_ERROR;
6342 goto cleanup;
6343 }
6344
6345 if ((current_attr.external || current_attr.intrinsic)
6346 && sym->attr.flavor != FL_PROCEDURE
6347 && gfc_add_flavor (&sym->attr, FL_PROCEDURE, sym->name, NULL) == FAILURE)
6348 {
6349 m = MATCH_ERROR;
6350 goto cleanup;
6351 }
6352
6353 add_hidden_procptr_result (sym);
6354
6355 return MATCH_YES;
6356
6357 cleanup:
6358 gfc_free_array_spec (as);
6359 return m;
6360 }
6361
6362
6363 /* Generic attribute declaration subroutine. Used for attributes that
6364 just have a list of names. */
6365
6366 static match
attr_decl(void)6367 attr_decl (void)
6368 {
6369 match m;
6370
6371 /* Gobble the optional double colon, by simply ignoring the result
6372 of gfc_match(). */
6373 gfc_match (" ::");
6374
6375 for (;;)
6376 {
6377 m = attr_decl1 ();
6378 if (m != MATCH_YES)
6379 break;
6380
6381 if (gfc_match_eos () == MATCH_YES)
6382 {
6383 m = MATCH_YES;
6384 break;
6385 }
6386
6387 if (gfc_match_char (',') != MATCH_YES)
6388 {
6389 gfc_error ("Unexpected character in variable list at %C");
6390 m = MATCH_ERROR;
6391 break;
6392 }
6393 }
6394
6395 return m;
6396 }
6397
6398
6399 /* This routine matches Cray Pointer declarations of the form:
6400 pointer ( <pointer>, <pointee> )
6401 or
6402 pointer ( <pointer1>, <pointee1> ), ( <pointer2>, <pointee2> ), ...
6403 The pointer, if already declared, should be an integer. Otherwise, we
6404 set it as BT_INTEGER with kind gfc_index_integer_kind. The pointee may
6405 be either a scalar, or an array declaration. No space is allocated for
6406 the pointee. For the statement
6407 pointer (ipt, ar(10))
6408 any subsequent uses of ar will be translated (in C-notation) as
6409 ar(i) => ((<type> *) ipt)(i)
6410 After gimplification, pointee variable will disappear in the code. */
6411
6412 static match
cray_pointer_decl(void)6413 cray_pointer_decl (void)
6414 {
6415 match m;
6416 gfc_array_spec *as = NULL;
6417 gfc_symbol *cptr; /* Pointer symbol. */
6418 gfc_symbol *cpte; /* Pointee symbol. */
6419 locus var_locus;
6420 bool done = false;
6421
6422 while (!done)
6423 {
6424 if (gfc_match_char ('(') != MATCH_YES)
6425 {
6426 gfc_error ("Expected '(' at %C");
6427 return MATCH_ERROR;
6428 }
6429
6430 /* Match pointer. */
6431 var_locus = gfc_current_locus;
6432 gfc_clear_attr (¤t_attr);
6433 gfc_add_cray_pointer (¤t_attr, &var_locus);
6434 current_ts.type = BT_INTEGER;
6435 current_ts.kind = gfc_index_integer_kind;
6436
6437 m = gfc_match_symbol (&cptr, 0);
6438 if (m != MATCH_YES)
6439 {
6440 gfc_error ("Expected variable name at %C");
6441 return m;
6442 }
6443
6444 if (gfc_add_cray_pointer (&cptr->attr, &var_locus) == FAILURE)
6445 return MATCH_ERROR;
6446
6447 gfc_set_sym_referenced (cptr);
6448
6449 if (cptr->ts.type == BT_UNKNOWN) /* Override the type, if necessary. */
6450 {
6451 cptr->ts.type = BT_INTEGER;
6452 cptr->ts.kind = gfc_index_integer_kind;
6453 }
6454 else if (cptr->ts.type != BT_INTEGER)
6455 {
6456 gfc_error ("Cray pointer at %C must be an integer");
6457 return MATCH_ERROR;
6458 }
6459 else if (cptr->ts.kind < gfc_index_integer_kind)
6460 gfc_warning ("Cray pointer at %C has %d bytes of precision;"
6461 " memory addresses require %d bytes",
6462 cptr->ts.kind, gfc_index_integer_kind);
6463
6464 if (gfc_match_char (',') != MATCH_YES)
6465 {
6466 gfc_error ("Expected \",\" at %C");
6467 return MATCH_ERROR;
6468 }
6469
6470 /* Match Pointee. */
6471 var_locus = gfc_current_locus;
6472 gfc_clear_attr (¤t_attr);
6473 gfc_add_cray_pointee (¤t_attr, &var_locus);
6474 current_ts.type = BT_UNKNOWN;
6475 current_ts.kind = 0;
6476
6477 m = gfc_match_symbol (&cpte, 0);
6478 if (m != MATCH_YES)
6479 {
6480 gfc_error ("Expected variable name at %C");
6481 return m;
6482 }
6483
6484 /* Check for an optional array spec. */
6485 m = gfc_match_array_spec (&as, true, false);
6486 if (m == MATCH_ERROR)
6487 {
6488 gfc_free_array_spec (as);
6489 return m;
6490 }
6491 else if (m == MATCH_NO)
6492 {
6493 gfc_free_array_spec (as);
6494 as = NULL;
6495 }
6496
6497 if (gfc_add_cray_pointee (&cpte->attr, &var_locus) == FAILURE)
6498 return MATCH_ERROR;
6499
6500 gfc_set_sym_referenced (cpte);
6501
6502 if (cpte->as == NULL)
6503 {
6504 if (gfc_set_array_spec (cpte, as, &var_locus) == FAILURE)
6505 gfc_internal_error ("Couldn't set Cray pointee array spec.");
6506 }
6507 else if (as != NULL)
6508 {
6509 gfc_error ("Duplicate array spec for Cray pointee at %C");
6510 gfc_free_array_spec (as);
6511 return MATCH_ERROR;
6512 }
6513
6514 as = NULL;
6515
6516 if (cpte->as != NULL)
6517 {
6518 /* Fix array spec. */
6519 m = gfc_mod_pointee_as (cpte->as);
6520 if (m == MATCH_ERROR)
6521 return m;
6522 }
6523
6524 /* Point the Pointee at the Pointer. */
6525 cpte->cp_pointer = cptr;
6526
6527 if (gfc_match_char (')') != MATCH_YES)
6528 {
6529 gfc_error ("Expected \")\" at %C");
6530 return MATCH_ERROR;
6531 }
6532 m = gfc_match_char (',');
6533 if (m != MATCH_YES)
6534 done = true; /* Stop searching for more declarations. */
6535
6536 }
6537
6538 if (m == MATCH_ERROR /* Failed when trying to find ',' above. */
6539 || gfc_match_eos () != MATCH_YES)
6540 {
6541 gfc_error ("Expected \",\" or end of statement at %C");
6542 return MATCH_ERROR;
6543 }
6544 return MATCH_YES;
6545 }
6546
6547
6548 match
gfc_match_external(void)6549 gfc_match_external (void)
6550 {
6551
6552 gfc_clear_attr (¤t_attr);
6553 current_attr.external = 1;
6554
6555 return attr_decl ();
6556 }
6557
6558
6559 match
gfc_match_intent(void)6560 gfc_match_intent (void)
6561 {
6562 sym_intent intent;
6563
6564 /* This is not allowed within a BLOCK construct! */
6565 if (gfc_current_state () == COMP_BLOCK)
6566 {
6567 gfc_error ("INTENT is not allowed inside of BLOCK at %C");
6568 return MATCH_ERROR;
6569 }
6570
6571 intent = match_intent_spec ();
6572 if (intent == INTENT_UNKNOWN)
6573 return MATCH_ERROR;
6574
6575 gfc_clear_attr (¤t_attr);
6576 current_attr.intent = intent;
6577
6578 return attr_decl ();
6579 }
6580
6581
6582 match
gfc_match_intrinsic(void)6583 gfc_match_intrinsic (void)
6584 {
6585
6586 gfc_clear_attr (¤t_attr);
6587 current_attr.intrinsic = 1;
6588
6589 return attr_decl ();
6590 }
6591
6592
6593 match
gfc_match_optional(void)6594 gfc_match_optional (void)
6595 {
6596 /* This is not allowed within a BLOCK construct! */
6597 if (gfc_current_state () == COMP_BLOCK)
6598 {
6599 gfc_error ("OPTIONAL is not allowed inside of BLOCK at %C");
6600 return MATCH_ERROR;
6601 }
6602
6603 gfc_clear_attr (¤t_attr);
6604 current_attr.optional = 1;
6605
6606 return attr_decl ();
6607 }
6608
6609
6610 match
gfc_match_pointer(void)6611 gfc_match_pointer (void)
6612 {
6613 gfc_gobble_whitespace ();
6614 if (gfc_peek_ascii_char () == '(')
6615 {
6616 if (!gfc_option.flag_cray_pointer)
6617 {
6618 gfc_error ("Cray pointer declaration at %C requires -fcray-pointer "
6619 "flag");
6620 return MATCH_ERROR;
6621 }
6622 return cray_pointer_decl ();
6623 }
6624 else
6625 {
6626 gfc_clear_attr (¤t_attr);
6627 current_attr.pointer = 1;
6628
6629 return attr_decl ();
6630 }
6631 }
6632
6633
6634 match
gfc_match_allocatable(void)6635 gfc_match_allocatable (void)
6636 {
6637 gfc_clear_attr (¤t_attr);
6638 current_attr.allocatable = 1;
6639
6640 return attr_decl ();
6641 }
6642
6643
6644 match
gfc_match_codimension(void)6645 gfc_match_codimension (void)
6646 {
6647 gfc_clear_attr (¤t_attr);
6648 current_attr.codimension = 1;
6649
6650 return attr_decl ();
6651 }
6652
6653
6654 match
gfc_match_contiguous(void)6655 gfc_match_contiguous (void)
6656 {
6657 if (gfc_notify_std (GFC_STD_F2008, "CONTIGUOUS statement at %C")
6658 == FAILURE)
6659 return MATCH_ERROR;
6660
6661 gfc_clear_attr (¤t_attr);
6662 current_attr.contiguous = 1;
6663
6664 return attr_decl ();
6665 }
6666
6667
6668 match
gfc_match_dimension(void)6669 gfc_match_dimension (void)
6670 {
6671 gfc_clear_attr (¤t_attr);
6672 current_attr.dimension = 1;
6673
6674 return attr_decl ();
6675 }
6676
6677
6678 match
gfc_match_target(void)6679 gfc_match_target (void)
6680 {
6681 gfc_clear_attr (¤t_attr);
6682 current_attr.target = 1;
6683
6684 return attr_decl ();
6685 }
6686
6687
6688 /* Match the list of entities being specified in a PUBLIC or PRIVATE
6689 statement. */
6690
6691 static match
access_attr_decl(gfc_statement st)6692 access_attr_decl (gfc_statement st)
6693 {
6694 char name[GFC_MAX_SYMBOL_LEN + 1];
6695 interface_type type;
6696 gfc_user_op *uop;
6697 gfc_symbol *sym, *dt_sym;
6698 gfc_intrinsic_op op;
6699 match m;
6700
6701 if (gfc_match (" ::") == MATCH_NO && gfc_match_space () == MATCH_NO)
6702 goto done;
6703
6704 for (;;)
6705 {
6706 m = gfc_match_generic_spec (&type, name, &op);
6707 if (m == MATCH_NO)
6708 goto syntax;
6709 if (m == MATCH_ERROR)
6710 return MATCH_ERROR;
6711
6712 switch (type)
6713 {
6714 case INTERFACE_NAMELESS:
6715 case INTERFACE_ABSTRACT:
6716 goto syntax;
6717
6718 case INTERFACE_GENERIC:
6719 if (gfc_get_symbol (name, NULL, &sym))
6720 goto done;
6721
6722 if (gfc_add_access (&sym->attr, (st == ST_PUBLIC)
6723 ? ACCESS_PUBLIC : ACCESS_PRIVATE,
6724 sym->name, NULL) == FAILURE)
6725 return MATCH_ERROR;
6726
6727 if (sym->attr.generic && (dt_sym = gfc_find_dt_in_generic (sym))
6728 && gfc_add_access (&dt_sym->attr,
6729 (st == ST_PUBLIC) ? ACCESS_PUBLIC
6730 : ACCESS_PRIVATE,
6731 sym->name, NULL) == FAILURE)
6732 return MATCH_ERROR;
6733
6734 break;
6735
6736 case INTERFACE_INTRINSIC_OP:
6737 if (gfc_current_ns->operator_access[op] == ACCESS_UNKNOWN)
6738 {
6739 gfc_intrinsic_op other_op;
6740
6741 gfc_current_ns->operator_access[op] =
6742 (st == ST_PUBLIC) ? ACCESS_PUBLIC : ACCESS_PRIVATE;
6743
6744 /* Handle the case if there is another op with the same
6745 function, for INTRINSIC_EQ vs. INTRINSIC_EQ_OS and so on. */
6746 other_op = gfc_equivalent_op (op);
6747
6748 if (other_op != INTRINSIC_NONE)
6749 gfc_current_ns->operator_access[other_op] =
6750 (st == ST_PUBLIC) ? ACCESS_PUBLIC : ACCESS_PRIVATE;
6751
6752 }
6753 else
6754 {
6755 gfc_error ("Access specification of the %s operator at %C has "
6756 "already been specified", gfc_op2string (op));
6757 goto done;
6758 }
6759
6760 break;
6761
6762 case INTERFACE_USER_OP:
6763 uop = gfc_get_uop (name);
6764
6765 if (uop->access == ACCESS_UNKNOWN)
6766 {
6767 uop->access = (st == ST_PUBLIC)
6768 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
6769 }
6770 else
6771 {
6772 gfc_error ("Access specification of the .%s. operator at %C "
6773 "has already been specified", sym->name);
6774 goto done;
6775 }
6776
6777 break;
6778 }
6779
6780 if (gfc_match_char (',') == MATCH_NO)
6781 break;
6782 }
6783
6784 if (gfc_match_eos () != MATCH_YES)
6785 goto syntax;
6786 return MATCH_YES;
6787
6788 syntax:
6789 gfc_syntax_error (st);
6790
6791 done:
6792 return MATCH_ERROR;
6793 }
6794
6795
6796 match
gfc_match_protected(void)6797 gfc_match_protected (void)
6798 {
6799 gfc_symbol *sym;
6800 match m;
6801
6802 if (gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
6803 {
6804 gfc_error ("PROTECTED at %C only allowed in specification "
6805 "part of a module");
6806 return MATCH_ERROR;
6807
6808 }
6809
6810 if (gfc_notify_std (GFC_STD_F2003, "PROTECTED statement at %C")
6811 == FAILURE)
6812 return MATCH_ERROR;
6813
6814 if (gfc_match (" ::") == MATCH_NO && gfc_match_space () == MATCH_NO)
6815 {
6816 return MATCH_ERROR;
6817 }
6818
6819 if (gfc_match_eos () == MATCH_YES)
6820 goto syntax;
6821
6822 for(;;)
6823 {
6824 m = gfc_match_symbol (&sym, 0);
6825 switch (m)
6826 {
6827 case MATCH_YES:
6828 if (gfc_add_protected (&sym->attr, sym->name, &gfc_current_locus)
6829 == FAILURE)
6830 return MATCH_ERROR;
6831 goto next_item;
6832
6833 case MATCH_NO:
6834 break;
6835
6836 case MATCH_ERROR:
6837 return MATCH_ERROR;
6838 }
6839
6840 next_item:
6841 if (gfc_match_eos () == MATCH_YES)
6842 break;
6843 if (gfc_match_char (',') != MATCH_YES)
6844 goto syntax;
6845 }
6846
6847 return MATCH_YES;
6848
6849 syntax:
6850 gfc_error ("Syntax error in PROTECTED statement at %C");
6851 return MATCH_ERROR;
6852 }
6853
6854
6855 /* The PRIVATE statement is a bit weird in that it can be an attribute
6856 declaration, but also works as a standalone statement inside of a
6857 type declaration or a module. */
6858
6859 match
gfc_match_private(gfc_statement * st)6860 gfc_match_private (gfc_statement *st)
6861 {
6862
6863 if (gfc_match ("private") != MATCH_YES)
6864 return MATCH_NO;
6865
6866 if (gfc_current_state () != COMP_MODULE
6867 && !(gfc_current_state () == COMP_DERIVED
6868 && gfc_state_stack->previous
6869 && gfc_state_stack->previous->state == COMP_MODULE)
6870 && !(gfc_current_state () == COMP_DERIVED_CONTAINS
6871 && gfc_state_stack->previous && gfc_state_stack->previous->previous
6872 && gfc_state_stack->previous->previous->state == COMP_MODULE))
6873 {
6874 gfc_error ("PRIVATE statement at %C is only allowed in the "
6875 "specification part of a module");
6876 return MATCH_ERROR;
6877 }
6878
6879 if (gfc_current_state () == COMP_DERIVED)
6880 {
6881 if (gfc_match_eos () == MATCH_YES)
6882 {
6883 *st = ST_PRIVATE;
6884 return MATCH_YES;
6885 }
6886
6887 gfc_syntax_error (ST_PRIVATE);
6888 return MATCH_ERROR;
6889 }
6890
6891 if (gfc_match_eos () == MATCH_YES)
6892 {
6893 *st = ST_PRIVATE;
6894 return MATCH_YES;
6895 }
6896
6897 *st = ST_ATTR_DECL;
6898 return access_attr_decl (ST_PRIVATE);
6899 }
6900
6901
6902 match
gfc_match_public(gfc_statement * st)6903 gfc_match_public (gfc_statement *st)
6904 {
6905
6906 if (gfc_match ("public") != MATCH_YES)
6907 return MATCH_NO;
6908
6909 if (gfc_current_state () != COMP_MODULE)
6910 {
6911 gfc_error ("PUBLIC statement at %C is only allowed in the "
6912 "specification part of a module");
6913 return MATCH_ERROR;
6914 }
6915
6916 if (gfc_match_eos () == MATCH_YES)
6917 {
6918 *st = ST_PUBLIC;
6919 return MATCH_YES;
6920 }
6921
6922 *st = ST_ATTR_DECL;
6923 return access_attr_decl (ST_PUBLIC);
6924 }
6925
6926
6927 /* Workhorse for gfc_match_parameter. */
6928
6929 static match
do_parm(void)6930 do_parm (void)
6931 {
6932 gfc_symbol *sym;
6933 gfc_expr *init;
6934 match m;
6935 gfc_try t;
6936
6937 m = gfc_match_symbol (&sym, 0);
6938 if (m == MATCH_NO)
6939 gfc_error ("Expected variable name at %C in PARAMETER statement");
6940
6941 if (m != MATCH_YES)
6942 return m;
6943
6944 if (gfc_match_char ('=') == MATCH_NO)
6945 {
6946 gfc_error ("Expected = sign in PARAMETER statement at %C");
6947 return MATCH_ERROR;
6948 }
6949
6950 m = gfc_match_init_expr (&init);
6951 if (m == MATCH_NO)
6952 gfc_error ("Expected expression at %C in PARAMETER statement");
6953 if (m != MATCH_YES)
6954 return m;
6955
6956 if (sym->ts.type == BT_UNKNOWN
6957 && gfc_set_default_type (sym, 1, NULL) == FAILURE)
6958 {
6959 m = MATCH_ERROR;
6960 goto cleanup;
6961 }
6962
6963 if (gfc_check_assign_symbol (sym, NULL, init) == FAILURE
6964 || gfc_add_flavor (&sym->attr, FL_PARAMETER, sym->name, NULL) == FAILURE)
6965 {
6966 m = MATCH_ERROR;
6967 goto cleanup;
6968 }
6969
6970 if (sym->value)
6971 {
6972 gfc_error ("Initializing already initialized variable at %C");
6973 m = MATCH_ERROR;
6974 goto cleanup;
6975 }
6976
6977 t = add_init_expr_to_sym (sym->name, &init, &gfc_current_locus);
6978 return (t == SUCCESS) ? MATCH_YES : MATCH_ERROR;
6979
6980 cleanup:
6981 gfc_free_expr (init);
6982 return m;
6983 }
6984
6985
6986 /* Match a parameter statement, with the weird syntax that these have. */
6987
6988 match
gfc_match_parameter(void)6989 gfc_match_parameter (void)
6990 {
6991 match m;
6992
6993 if (gfc_match_char ('(') == MATCH_NO)
6994 return MATCH_NO;
6995
6996 for (;;)
6997 {
6998 m = do_parm ();
6999 if (m != MATCH_YES)
7000 break;
7001
7002 if (gfc_match (" )%t") == MATCH_YES)
7003 break;
7004
7005 if (gfc_match_char (',') != MATCH_YES)
7006 {
7007 gfc_error ("Unexpected characters in PARAMETER statement at %C");
7008 m = MATCH_ERROR;
7009 break;
7010 }
7011 }
7012
7013 return m;
7014 }
7015
7016
7017 /* Save statements have a special syntax. */
7018
7019 match
gfc_match_save(void)7020 gfc_match_save (void)
7021 {
7022 char n[GFC_MAX_SYMBOL_LEN+1];
7023 gfc_common_head *c;
7024 gfc_symbol *sym;
7025 match m;
7026
7027 if (gfc_match_eos () == MATCH_YES)
7028 {
7029 if (gfc_current_ns->seen_save)
7030 {
7031 if (gfc_notify_std (GFC_STD_LEGACY, "Blanket SAVE statement at %C "
7032 "follows previous SAVE statement")
7033 == FAILURE)
7034 return MATCH_ERROR;
7035 }
7036
7037 gfc_current_ns->save_all = gfc_current_ns->seen_save = 1;
7038 return MATCH_YES;
7039 }
7040
7041 if (gfc_current_ns->save_all)
7042 {
7043 if (gfc_notify_std (GFC_STD_LEGACY, "SAVE statement at %C follows "
7044 "blanket SAVE statement")
7045 == FAILURE)
7046 return MATCH_ERROR;
7047 }
7048
7049 gfc_match (" ::");
7050
7051 for (;;)
7052 {
7053 m = gfc_match_symbol (&sym, 0);
7054 switch (m)
7055 {
7056 case MATCH_YES:
7057 if (gfc_add_save (&sym->attr, SAVE_EXPLICIT, sym->name,
7058 &gfc_current_locus) == FAILURE)
7059 return MATCH_ERROR;
7060 goto next_item;
7061
7062 case MATCH_NO:
7063 break;
7064
7065 case MATCH_ERROR:
7066 return MATCH_ERROR;
7067 }
7068
7069 m = gfc_match (" / %n /", &n);
7070 if (m == MATCH_ERROR)
7071 return MATCH_ERROR;
7072 if (m == MATCH_NO)
7073 goto syntax;
7074
7075 c = gfc_get_common (n, 0);
7076 c->saved = 1;
7077
7078 gfc_current_ns->seen_save = 1;
7079
7080 next_item:
7081 if (gfc_match_eos () == MATCH_YES)
7082 break;
7083 if (gfc_match_char (',') != MATCH_YES)
7084 goto syntax;
7085 }
7086
7087 return MATCH_YES;
7088
7089 syntax:
7090 gfc_error ("Syntax error in SAVE statement at %C");
7091 return MATCH_ERROR;
7092 }
7093
7094
7095 match
gfc_match_value(void)7096 gfc_match_value (void)
7097 {
7098 gfc_symbol *sym;
7099 match m;
7100
7101 /* This is not allowed within a BLOCK construct! */
7102 if (gfc_current_state () == COMP_BLOCK)
7103 {
7104 gfc_error ("VALUE is not allowed inside of BLOCK at %C");
7105 return MATCH_ERROR;
7106 }
7107
7108 if (gfc_notify_std (GFC_STD_F2003, "VALUE statement at %C")
7109 == FAILURE)
7110 return MATCH_ERROR;
7111
7112 if (gfc_match (" ::") == MATCH_NO && gfc_match_space () == MATCH_NO)
7113 {
7114 return MATCH_ERROR;
7115 }
7116
7117 if (gfc_match_eos () == MATCH_YES)
7118 goto syntax;
7119
7120 for(;;)
7121 {
7122 m = gfc_match_symbol (&sym, 0);
7123 switch (m)
7124 {
7125 case MATCH_YES:
7126 if (gfc_add_value (&sym->attr, sym->name, &gfc_current_locus)
7127 == FAILURE)
7128 return MATCH_ERROR;
7129 goto next_item;
7130
7131 case MATCH_NO:
7132 break;
7133
7134 case MATCH_ERROR:
7135 return MATCH_ERROR;
7136 }
7137
7138 next_item:
7139 if (gfc_match_eos () == MATCH_YES)
7140 break;
7141 if (gfc_match_char (',') != MATCH_YES)
7142 goto syntax;
7143 }
7144
7145 return MATCH_YES;
7146
7147 syntax:
7148 gfc_error ("Syntax error in VALUE statement at %C");
7149 return MATCH_ERROR;
7150 }
7151
7152
7153 match
gfc_match_volatile(void)7154 gfc_match_volatile (void)
7155 {
7156 gfc_symbol *sym;
7157 match m;
7158
7159 if (gfc_notify_std (GFC_STD_F2003, "VOLATILE statement at %C")
7160 == FAILURE)
7161 return MATCH_ERROR;
7162
7163 if (gfc_match (" ::") == MATCH_NO && gfc_match_space () == MATCH_NO)
7164 {
7165 return MATCH_ERROR;
7166 }
7167
7168 if (gfc_match_eos () == MATCH_YES)
7169 goto syntax;
7170
7171 for(;;)
7172 {
7173 /* VOLATILE is special because it can be added to host-associated
7174 symbols locally. Except for coarrays. */
7175 m = gfc_match_symbol (&sym, 1);
7176 switch (m)
7177 {
7178 case MATCH_YES:
7179 /* F2008, C560+C561. VOLATILE for host-/use-associated variable or
7180 for variable in a BLOCK which is defined outside of the BLOCK. */
7181 if (sym->ns != gfc_current_ns && sym->attr.codimension)
7182 {
7183 gfc_error ("Specifying VOLATILE for coarray variable '%s' at "
7184 "%C, which is use-/host-associated", sym->name);
7185 return MATCH_ERROR;
7186 }
7187 if (gfc_add_volatile (&sym->attr, sym->name, &gfc_current_locus)
7188 == FAILURE)
7189 return MATCH_ERROR;
7190 goto next_item;
7191
7192 case MATCH_NO:
7193 break;
7194
7195 case MATCH_ERROR:
7196 return MATCH_ERROR;
7197 }
7198
7199 next_item:
7200 if (gfc_match_eos () == MATCH_YES)
7201 break;
7202 if (gfc_match_char (',') != MATCH_YES)
7203 goto syntax;
7204 }
7205
7206 return MATCH_YES;
7207
7208 syntax:
7209 gfc_error ("Syntax error in VOLATILE statement at %C");
7210 return MATCH_ERROR;
7211 }
7212
7213
7214 match
gfc_match_asynchronous(void)7215 gfc_match_asynchronous (void)
7216 {
7217 gfc_symbol *sym;
7218 match m;
7219
7220 if (gfc_notify_std (GFC_STD_F2003, "ASYNCHRONOUS statement at %C")
7221 == FAILURE)
7222 return MATCH_ERROR;
7223
7224 if (gfc_match (" ::") == MATCH_NO && gfc_match_space () == MATCH_NO)
7225 {
7226 return MATCH_ERROR;
7227 }
7228
7229 if (gfc_match_eos () == MATCH_YES)
7230 goto syntax;
7231
7232 for(;;)
7233 {
7234 /* ASYNCHRONOUS is special because it can be added to host-associated
7235 symbols locally. */
7236 m = gfc_match_symbol (&sym, 1);
7237 switch (m)
7238 {
7239 case MATCH_YES:
7240 if (gfc_add_asynchronous (&sym->attr, sym->name, &gfc_current_locus)
7241 == FAILURE)
7242 return MATCH_ERROR;
7243 goto next_item;
7244
7245 case MATCH_NO:
7246 break;
7247
7248 case MATCH_ERROR:
7249 return MATCH_ERROR;
7250 }
7251
7252 next_item:
7253 if (gfc_match_eos () == MATCH_YES)
7254 break;
7255 if (gfc_match_char (',') != MATCH_YES)
7256 goto syntax;
7257 }
7258
7259 return MATCH_YES;
7260
7261 syntax:
7262 gfc_error ("Syntax error in ASYNCHRONOUS statement at %C");
7263 return MATCH_ERROR;
7264 }
7265
7266
7267 /* Match a module procedure statement. Note that we have to modify
7268 symbols in the parent's namespace because the current one was there
7269 to receive symbols that are in an interface's formal argument list. */
7270
7271 match
gfc_match_modproc(void)7272 gfc_match_modproc (void)
7273 {
7274 char name[GFC_MAX_SYMBOL_LEN + 1];
7275 gfc_symbol *sym;
7276 match m;
7277 locus old_locus;
7278 gfc_namespace *module_ns;
7279 gfc_interface *old_interface_head, *interface;
7280
7281 if (gfc_state_stack->state != COMP_INTERFACE
7282 || gfc_state_stack->previous == NULL
7283 || current_interface.type == INTERFACE_NAMELESS
7284 || current_interface.type == INTERFACE_ABSTRACT)
7285 {
7286 gfc_error ("MODULE PROCEDURE at %C must be in a generic module "
7287 "interface");
7288 return MATCH_ERROR;
7289 }
7290
7291 module_ns = gfc_current_ns->parent;
7292 for (; module_ns; module_ns = module_ns->parent)
7293 if (module_ns->proc_name->attr.flavor == FL_MODULE
7294 || module_ns->proc_name->attr.flavor == FL_PROGRAM
7295 || (module_ns->proc_name->attr.flavor == FL_PROCEDURE
7296 && !module_ns->proc_name->attr.contained))
7297 break;
7298
7299 if (module_ns == NULL)
7300 return MATCH_ERROR;
7301
7302 /* Store the current state of the interface. We will need it if we
7303 end up with a syntax error and need to recover. */
7304 old_interface_head = gfc_current_interface_head ();
7305
7306 /* Check if the F2008 optional double colon appears. */
7307 gfc_gobble_whitespace ();
7308 old_locus = gfc_current_locus;
7309 if (gfc_match ("::") == MATCH_YES)
7310 {
7311 if (gfc_notify_std (GFC_STD_F2008, "double colon in "
7312 "MODULE PROCEDURE statement at %L", &old_locus)
7313 == FAILURE)
7314 return MATCH_ERROR;
7315 }
7316 else
7317 gfc_current_locus = old_locus;
7318
7319 for (;;)
7320 {
7321 bool last = false;
7322 old_locus = gfc_current_locus;
7323
7324 m = gfc_match_name (name);
7325 if (m == MATCH_NO)
7326 goto syntax;
7327 if (m != MATCH_YES)
7328 return MATCH_ERROR;
7329
7330 /* Check for syntax error before starting to add symbols to the
7331 current namespace. */
7332 if (gfc_match_eos () == MATCH_YES)
7333 last = true;
7334
7335 if (!last && gfc_match_char (',') != MATCH_YES)
7336 goto syntax;
7337
7338 /* Now we're sure the syntax is valid, we process this item
7339 further. */
7340 if (gfc_get_symbol (name, module_ns, &sym))
7341 return MATCH_ERROR;
7342
7343 if (sym->attr.intrinsic)
7344 {
7345 gfc_error ("Intrinsic procedure at %L cannot be a MODULE "
7346 "PROCEDURE", &old_locus);
7347 return MATCH_ERROR;
7348 }
7349
7350 if (sym->attr.proc != PROC_MODULE
7351 && gfc_add_procedure (&sym->attr, PROC_MODULE,
7352 sym->name, NULL) == FAILURE)
7353 return MATCH_ERROR;
7354
7355 if (gfc_add_interface (sym) == FAILURE)
7356 return MATCH_ERROR;
7357
7358 sym->attr.mod_proc = 1;
7359 sym->declared_at = old_locus;
7360
7361 if (last)
7362 break;
7363 }
7364
7365 return MATCH_YES;
7366
7367 syntax:
7368 /* Restore the previous state of the interface. */
7369 interface = gfc_current_interface_head ();
7370 gfc_set_current_interface_head (old_interface_head);
7371
7372 /* Free the new interfaces. */
7373 while (interface != old_interface_head)
7374 {
7375 gfc_interface *i = interface->next;
7376 free (interface);
7377 interface = i;
7378 }
7379
7380 /* And issue a syntax error. */
7381 gfc_syntax_error (ST_MODULE_PROC);
7382 return MATCH_ERROR;
7383 }
7384
7385
7386 /* Check a derived type that is being extended. */
7387 static gfc_symbol*
check_extended_derived_type(char * name)7388 check_extended_derived_type (char *name)
7389 {
7390 gfc_symbol *extended;
7391
7392 if (gfc_find_symbol (name, gfc_current_ns, 1, &extended))
7393 {
7394 gfc_error ("Ambiguous symbol in TYPE definition at %C");
7395 return NULL;
7396 }
7397
7398 if (!extended)
7399 {
7400 gfc_error ("No such symbol in TYPE definition at %C");
7401 return NULL;
7402 }
7403
7404 extended = gfc_find_dt_in_generic (extended);
7405
7406 if (extended->attr.flavor != FL_DERIVED)
7407 {
7408 gfc_error ("'%s' in EXTENDS expression at %C is not a "
7409 "derived type", name);
7410 return NULL;
7411 }
7412
7413 if (extended->attr.is_bind_c)
7414 {
7415 gfc_error ("'%s' cannot be extended at %C because it "
7416 "is BIND(C)", extended->name);
7417 return NULL;
7418 }
7419
7420 if (extended->attr.sequence)
7421 {
7422 gfc_error ("'%s' cannot be extended at %C because it "
7423 "is a SEQUENCE type", extended->name);
7424 return NULL;
7425 }
7426
7427 return extended;
7428 }
7429
7430
7431 /* Match the optional attribute specifiers for a type declaration.
7432 Return MATCH_ERROR if an error is encountered in one of the handled
7433 attributes (public, private, bind(c)), MATCH_NO if what's found is
7434 not a handled attribute, and MATCH_YES otherwise. TODO: More error
7435 checking on attribute conflicts needs to be done. */
7436
7437 match
gfc_get_type_attr_spec(symbol_attribute * attr,char * name)7438 gfc_get_type_attr_spec (symbol_attribute *attr, char *name)
7439 {
7440 /* See if the derived type is marked as private. */
7441 if (gfc_match (" , private") == MATCH_YES)
7442 {
7443 if (gfc_current_state () != COMP_MODULE)
7444 {
7445 gfc_error ("Derived type at %C can only be PRIVATE in the "
7446 "specification part of a module");
7447 return MATCH_ERROR;
7448 }
7449
7450 if (gfc_add_access (attr, ACCESS_PRIVATE, NULL, NULL) == FAILURE)
7451 return MATCH_ERROR;
7452 }
7453 else if (gfc_match (" , public") == MATCH_YES)
7454 {
7455 if (gfc_current_state () != COMP_MODULE)
7456 {
7457 gfc_error ("Derived type at %C can only be PUBLIC in the "
7458 "specification part of a module");
7459 return MATCH_ERROR;
7460 }
7461
7462 if (gfc_add_access (attr, ACCESS_PUBLIC, NULL, NULL) == FAILURE)
7463 return MATCH_ERROR;
7464 }
7465 else if (gfc_match (" , bind ( c )") == MATCH_YES)
7466 {
7467 /* If the type is defined to be bind(c) it then needs to make
7468 sure that all fields are interoperable. This will
7469 need to be a semantic check on the finished derived type.
7470 See 15.2.3 (lines 9-12) of F2003 draft. */
7471 if (gfc_add_is_bind_c (attr, NULL, &gfc_current_locus, 0) != SUCCESS)
7472 return MATCH_ERROR;
7473
7474 /* TODO: attr conflicts need to be checked, probably in symbol.c. */
7475 }
7476 else if (gfc_match (" , abstract") == MATCH_YES)
7477 {
7478 if (gfc_notify_std (GFC_STD_F2003, "ABSTRACT type at %C")
7479 == FAILURE)
7480 return MATCH_ERROR;
7481
7482 if (gfc_add_abstract (attr, &gfc_current_locus) == FAILURE)
7483 return MATCH_ERROR;
7484 }
7485 else if (name && gfc_match(" , extends ( %n )", name) == MATCH_YES)
7486 {
7487 if (gfc_add_extension (attr, &gfc_current_locus) == FAILURE)
7488 return MATCH_ERROR;
7489 }
7490 else
7491 return MATCH_NO;
7492
7493 /* If we get here, something matched. */
7494 return MATCH_YES;
7495 }
7496
7497
7498 /* Match the beginning of a derived type declaration. If a type name
7499 was the result of a function, then it is possible to have a symbol
7500 already to be known as a derived type yet have no components. */
7501
7502 match
gfc_match_derived_decl(void)7503 gfc_match_derived_decl (void)
7504 {
7505 char name[GFC_MAX_SYMBOL_LEN + 1];
7506 char parent[GFC_MAX_SYMBOL_LEN + 1];
7507 symbol_attribute attr;
7508 gfc_symbol *sym, *gensym;
7509 gfc_symbol *extended;
7510 match m;
7511 match is_type_attr_spec = MATCH_NO;
7512 bool seen_attr = false;
7513 gfc_interface *intr = NULL, *head;
7514
7515 if (gfc_current_state () == COMP_DERIVED)
7516 return MATCH_NO;
7517
7518 name[0] = '\0';
7519 parent[0] = '\0';
7520 gfc_clear_attr (&attr);
7521 extended = NULL;
7522
7523 do
7524 {
7525 is_type_attr_spec = gfc_get_type_attr_spec (&attr, parent);
7526 if (is_type_attr_spec == MATCH_ERROR)
7527 return MATCH_ERROR;
7528 if (is_type_attr_spec == MATCH_YES)
7529 seen_attr = true;
7530 } while (is_type_attr_spec == MATCH_YES);
7531
7532 /* Deal with derived type extensions. The extension attribute has
7533 been added to 'attr' but now the parent type must be found and
7534 checked. */
7535 if (parent[0])
7536 extended = check_extended_derived_type (parent);
7537
7538 if (parent[0] && !extended)
7539 return MATCH_ERROR;
7540
7541 if (gfc_match (" ::") != MATCH_YES && seen_attr)
7542 {
7543 gfc_error ("Expected :: in TYPE definition at %C");
7544 return MATCH_ERROR;
7545 }
7546
7547 m = gfc_match (" %n%t", name);
7548 if (m != MATCH_YES)
7549 return m;
7550
7551 /* Make sure the name is not the name of an intrinsic type. */
7552 if (gfc_is_intrinsic_typename (name))
7553 {
7554 gfc_error ("Type name '%s' at %C cannot be the same as an intrinsic "
7555 "type", name);
7556 return MATCH_ERROR;
7557 }
7558
7559 if (gfc_get_symbol (name, NULL, &gensym))
7560 return MATCH_ERROR;
7561
7562 if (!gensym->attr.generic && gensym->ts.type != BT_UNKNOWN)
7563 {
7564 gfc_error ("Derived type name '%s' at %C already has a basic type "
7565 "of %s", gensym->name, gfc_typename (&gensym->ts));
7566 return MATCH_ERROR;
7567 }
7568
7569 if (!gensym->attr.generic
7570 && gfc_add_generic (&gensym->attr, gensym->name, NULL) == FAILURE)
7571 return MATCH_ERROR;
7572
7573 if (!gensym->attr.function
7574 && gfc_add_function (&gensym->attr, gensym->name, NULL) == FAILURE)
7575 return MATCH_ERROR;
7576
7577 sym = gfc_find_dt_in_generic (gensym);
7578
7579 if (sym && (sym->components != NULL || sym->attr.zero_comp))
7580 {
7581 gfc_error ("Derived type definition of '%s' at %C has already been "
7582 "defined", sym->name);
7583 return MATCH_ERROR;
7584 }
7585
7586 if (!sym)
7587 {
7588 /* Use upper case to save the actual derived-type symbol. */
7589 gfc_get_symbol (gfc_get_string ("%c%s",
7590 (char) TOUPPER ((unsigned char) gensym->name[0]),
7591 &gensym->name[1]), NULL, &sym);
7592 sym->name = gfc_get_string (gensym->name);
7593 head = gensym->generic;
7594 intr = gfc_get_interface ();
7595 intr->sym = sym;
7596 intr->where = gfc_current_locus;
7597 intr->sym->declared_at = gfc_current_locus;
7598 intr->next = head;
7599 gensym->generic = intr;
7600 gensym->attr.if_source = IFSRC_DECL;
7601 }
7602
7603 /* The symbol may already have the derived attribute without the
7604 components. The ways this can happen is via a function
7605 definition, an INTRINSIC statement or a subtype in another
7606 derived type that is a pointer. The first part of the AND clause
7607 is true if the symbol is not the return value of a function. */
7608 if (sym->attr.flavor != FL_DERIVED
7609 && gfc_add_flavor (&sym->attr, FL_DERIVED, sym->name, NULL) == FAILURE)
7610 return MATCH_ERROR;
7611
7612 if (attr.access != ACCESS_UNKNOWN
7613 && gfc_add_access (&sym->attr, attr.access, sym->name, NULL) == FAILURE)
7614 return MATCH_ERROR;
7615 else if (sym->attr.access == ACCESS_UNKNOWN
7616 && gensym->attr.access != ACCESS_UNKNOWN
7617 && gfc_add_access (&sym->attr, gensym->attr.access, sym->name, NULL)
7618 == FAILURE)
7619 return MATCH_ERROR;
7620
7621 if (sym->attr.access != ACCESS_UNKNOWN
7622 && gensym->attr.access == ACCESS_UNKNOWN)
7623 gensym->attr.access = sym->attr.access;
7624
7625 /* See if the derived type was labeled as bind(c). */
7626 if (attr.is_bind_c != 0)
7627 sym->attr.is_bind_c = attr.is_bind_c;
7628
7629 /* Construct the f2k_derived namespace if it is not yet there. */
7630 if (!sym->f2k_derived)
7631 sym->f2k_derived = gfc_get_namespace (NULL, 0);
7632
7633 if (extended && !sym->components)
7634 {
7635 gfc_component *p;
7636 gfc_symtree *st;
7637
7638 /* Add the extended derived type as the first component. */
7639 gfc_add_component (sym, parent, &p);
7640 extended->refs++;
7641 gfc_set_sym_referenced (extended);
7642
7643 p->ts.type = BT_DERIVED;
7644 p->ts.u.derived = extended;
7645 p->initializer = gfc_default_initializer (&p->ts);
7646
7647 /* Set extension level. */
7648 if (extended->attr.extension == 255)
7649 {
7650 /* Since the extension field is 8 bit wide, we can only have
7651 up to 255 extension levels. */
7652 gfc_error ("Maximum extension level reached with type '%s' at %L",
7653 extended->name, &extended->declared_at);
7654 return MATCH_ERROR;
7655 }
7656 sym->attr.extension = extended->attr.extension + 1;
7657
7658 /* Provide the links between the extended type and its extension. */
7659 if (!extended->f2k_derived)
7660 extended->f2k_derived = gfc_get_namespace (NULL, 0);
7661 st = gfc_new_symtree (&extended->f2k_derived->sym_root, sym->name);
7662 st->n.sym = sym;
7663 }
7664
7665 if (!sym->hash_value)
7666 /* Set the hash for the compound name for this type. */
7667 sym->hash_value = gfc_hash_value (sym);
7668
7669 /* Take over the ABSTRACT attribute. */
7670 sym->attr.abstract = attr.abstract;
7671
7672 gfc_new_block = sym;
7673
7674 return MATCH_YES;
7675 }
7676
7677
7678 /* Cray Pointees can be declared as:
7679 pointer (ipt, a (n,m,...,*)) */
7680
7681 match
gfc_mod_pointee_as(gfc_array_spec * as)7682 gfc_mod_pointee_as (gfc_array_spec *as)
7683 {
7684 as->cray_pointee = true; /* This will be useful to know later. */
7685 if (as->type == AS_ASSUMED_SIZE)
7686 as->cp_was_assumed = true;
7687 else if (as->type == AS_ASSUMED_SHAPE)
7688 {
7689 gfc_error ("Cray Pointee at %C cannot be assumed shape array");
7690 return MATCH_ERROR;
7691 }
7692 return MATCH_YES;
7693 }
7694
7695
7696 /* Match the enum definition statement, here we are trying to match
7697 the first line of enum definition statement.
7698 Returns MATCH_YES if match is found. */
7699
7700 match
gfc_match_enum(void)7701 gfc_match_enum (void)
7702 {
7703 match m;
7704
7705 m = gfc_match_eos ();
7706 if (m != MATCH_YES)
7707 return m;
7708
7709 if (gfc_notify_std (GFC_STD_F2003, "ENUM and ENUMERATOR at %C")
7710 == FAILURE)
7711 return MATCH_ERROR;
7712
7713 return MATCH_YES;
7714 }
7715
7716
7717 /* Returns an initializer whose value is one higher than the value of the
7718 LAST_INITIALIZER argument. If the argument is NULL, the
7719 initializers value will be set to zero. The initializer's kind
7720 will be set to gfc_c_int_kind.
7721
7722 If -fshort-enums is given, the appropriate kind will be selected
7723 later after all enumerators have been parsed. A warning is issued
7724 here if an initializer exceeds gfc_c_int_kind. */
7725
7726 static gfc_expr *
enum_initializer(gfc_expr * last_initializer,locus where)7727 enum_initializer (gfc_expr *last_initializer, locus where)
7728 {
7729 gfc_expr *result;
7730 result = gfc_get_constant_expr (BT_INTEGER, gfc_c_int_kind, &where);
7731
7732 mpz_init (result->value.integer);
7733
7734 if (last_initializer != NULL)
7735 {
7736 mpz_add_ui (result->value.integer, last_initializer->value.integer, 1);
7737 result->where = last_initializer->where;
7738
7739 if (gfc_check_integer_range (result->value.integer,
7740 gfc_c_int_kind) != ARITH_OK)
7741 {
7742 gfc_error ("Enumerator exceeds the C integer type at %C");
7743 return NULL;
7744 }
7745 }
7746 else
7747 {
7748 /* Control comes here, if it's the very first enumerator and no
7749 initializer has been given. It will be initialized to zero. */
7750 mpz_set_si (result->value.integer, 0);
7751 }
7752
7753 return result;
7754 }
7755
7756
7757 /* Match a variable name with an optional initializer. When this
7758 subroutine is called, a variable is expected to be parsed next.
7759 Depending on what is happening at the moment, updates either the
7760 symbol table or the current interface. */
7761
7762 static match
enumerator_decl(void)7763 enumerator_decl (void)
7764 {
7765 char name[GFC_MAX_SYMBOL_LEN + 1];
7766 gfc_expr *initializer;
7767 gfc_array_spec *as = NULL;
7768 gfc_symbol *sym;
7769 locus var_locus;
7770 match m;
7771 gfc_try t;
7772 locus old_locus;
7773
7774 initializer = NULL;
7775 old_locus = gfc_current_locus;
7776
7777 /* When we get here, we've just matched a list of attributes and
7778 maybe a type and a double colon. The next thing we expect to see
7779 is the name of the symbol. */
7780 m = gfc_match_name (name);
7781 if (m != MATCH_YES)
7782 goto cleanup;
7783
7784 var_locus = gfc_current_locus;
7785
7786 /* OK, we've successfully matched the declaration. Now put the
7787 symbol in the current namespace. If we fail to create the symbol,
7788 bail out. */
7789 if (build_sym (name, NULL, false, &as, &var_locus) == FAILURE)
7790 {
7791 m = MATCH_ERROR;
7792 goto cleanup;
7793 }
7794
7795 /* The double colon must be present in order to have initializers.
7796 Otherwise the statement is ambiguous with an assignment statement. */
7797 if (colon_seen)
7798 {
7799 if (gfc_match_char ('=') == MATCH_YES)
7800 {
7801 m = gfc_match_init_expr (&initializer);
7802 if (m == MATCH_NO)
7803 {
7804 gfc_error ("Expected an initialization expression at %C");
7805 m = MATCH_ERROR;
7806 }
7807
7808 if (m != MATCH_YES)
7809 goto cleanup;
7810 }
7811 }
7812
7813 /* If we do not have an initializer, the initialization value of the
7814 previous enumerator (stored in last_initializer) is incremented
7815 by 1 and is used to initialize the current enumerator. */
7816 if (initializer == NULL)
7817 initializer = enum_initializer (last_initializer, old_locus);
7818
7819 if (initializer == NULL || initializer->ts.type != BT_INTEGER)
7820 {
7821 gfc_error ("ENUMERATOR %L not initialized with integer expression",
7822 &var_locus);
7823 m = MATCH_ERROR;
7824 goto cleanup;
7825 }
7826
7827 /* Store this current initializer, for the next enumerator variable
7828 to be parsed. add_init_expr_to_sym() zeros initializer, so we
7829 use last_initializer below. */
7830 last_initializer = initializer;
7831 t = add_init_expr_to_sym (name, &initializer, &var_locus);
7832
7833 /* Maintain enumerator history. */
7834 gfc_find_symbol (name, NULL, 0, &sym);
7835 create_enum_history (sym, last_initializer);
7836
7837 return (t == SUCCESS) ? MATCH_YES : MATCH_ERROR;
7838
7839 cleanup:
7840 /* Free stuff up and return. */
7841 gfc_free_expr (initializer);
7842
7843 return m;
7844 }
7845
7846
7847 /* Match the enumerator definition statement. */
7848
7849 match
gfc_match_enumerator_def(void)7850 gfc_match_enumerator_def (void)
7851 {
7852 match m;
7853 gfc_try t;
7854
7855 gfc_clear_ts (¤t_ts);
7856
7857 m = gfc_match (" enumerator");
7858 if (m != MATCH_YES)
7859 return m;
7860
7861 m = gfc_match (" :: ");
7862 if (m == MATCH_ERROR)
7863 return m;
7864
7865 colon_seen = (m == MATCH_YES);
7866
7867 if (gfc_current_state () != COMP_ENUM)
7868 {
7869 gfc_error ("ENUM definition statement expected before %C");
7870 gfc_free_enum_history ();
7871 return MATCH_ERROR;
7872 }
7873
7874 (¤t_ts)->type = BT_INTEGER;
7875 (¤t_ts)->kind = gfc_c_int_kind;
7876
7877 gfc_clear_attr (¤t_attr);
7878 t = gfc_add_flavor (¤t_attr, FL_PARAMETER, NULL, NULL);
7879 if (t == FAILURE)
7880 {
7881 m = MATCH_ERROR;
7882 goto cleanup;
7883 }
7884
7885 for (;;)
7886 {
7887 m = enumerator_decl ();
7888 if (m == MATCH_ERROR)
7889 {
7890 gfc_free_enum_history ();
7891 goto cleanup;
7892 }
7893 if (m == MATCH_NO)
7894 break;
7895
7896 if (gfc_match_eos () == MATCH_YES)
7897 goto cleanup;
7898 if (gfc_match_char (',') != MATCH_YES)
7899 break;
7900 }
7901
7902 if (gfc_current_state () == COMP_ENUM)
7903 {
7904 gfc_free_enum_history ();
7905 gfc_error ("Syntax error in ENUMERATOR definition at %C");
7906 m = MATCH_ERROR;
7907 }
7908
7909 cleanup:
7910 gfc_free_array_spec (current_as);
7911 current_as = NULL;
7912 return m;
7913
7914 }
7915
7916
7917 /* Match binding attributes. */
7918
7919 static match
match_binding_attributes(gfc_typebound_proc * ba,bool generic,bool ppc)7920 match_binding_attributes (gfc_typebound_proc* ba, bool generic, bool ppc)
7921 {
7922 bool found_passing = false;
7923 bool seen_ptr = false;
7924 match m = MATCH_YES;
7925
7926 /* Initialize to defaults. Do so even before the MATCH_NO check so that in
7927 this case the defaults are in there. */
7928 ba->access = ACCESS_UNKNOWN;
7929 ba->pass_arg = NULL;
7930 ba->pass_arg_num = 0;
7931 ba->nopass = 0;
7932 ba->non_overridable = 0;
7933 ba->deferred = 0;
7934 ba->ppc = ppc;
7935
7936 /* If we find a comma, we believe there are binding attributes. */
7937 m = gfc_match_char (',');
7938 if (m == MATCH_NO)
7939 goto done;
7940
7941 do
7942 {
7943 /* Access specifier. */
7944
7945 m = gfc_match (" public");
7946 if (m == MATCH_ERROR)
7947 goto error;
7948 if (m == MATCH_YES)
7949 {
7950 if (ba->access != ACCESS_UNKNOWN)
7951 {
7952 gfc_error ("Duplicate access-specifier at %C");
7953 goto error;
7954 }
7955
7956 ba->access = ACCESS_PUBLIC;
7957 continue;
7958 }
7959
7960 m = gfc_match (" private");
7961 if (m == MATCH_ERROR)
7962 goto error;
7963 if (m == MATCH_YES)
7964 {
7965 if (ba->access != ACCESS_UNKNOWN)
7966 {
7967 gfc_error ("Duplicate access-specifier at %C");
7968 goto error;
7969 }
7970
7971 ba->access = ACCESS_PRIVATE;
7972 continue;
7973 }
7974
7975 /* If inside GENERIC, the following is not allowed. */
7976 if (!generic)
7977 {
7978
7979 /* NOPASS flag. */
7980 m = gfc_match (" nopass");
7981 if (m == MATCH_ERROR)
7982 goto error;
7983 if (m == MATCH_YES)
7984 {
7985 if (found_passing)
7986 {
7987 gfc_error ("Binding attributes already specify passing,"
7988 " illegal NOPASS at %C");
7989 goto error;
7990 }
7991
7992 found_passing = true;
7993 ba->nopass = 1;
7994 continue;
7995 }
7996
7997 /* PASS possibly including argument. */
7998 m = gfc_match (" pass");
7999 if (m == MATCH_ERROR)
8000 goto error;
8001 if (m == MATCH_YES)
8002 {
8003 char arg[GFC_MAX_SYMBOL_LEN + 1];
8004
8005 if (found_passing)
8006 {
8007 gfc_error ("Binding attributes already specify passing,"
8008 " illegal PASS at %C");
8009 goto error;
8010 }
8011
8012 m = gfc_match (" ( %n )", arg);
8013 if (m == MATCH_ERROR)
8014 goto error;
8015 if (m == MATCH_YES)
8016 ba->pass_arg = gfc_get_string (arg);
8017 gcc_assert ((m == MATCH_YES) == (ba->pass_arg != NULL));
8018
8019 found_passing = true;
8020 ba->nopass = 0;
8021 continue;
8022 }
8023
8024 if (ppc)
8025 {
8026 /* POINTER flag. */
8027 m = gfc_match (" pointer");
8028 if (m == MATCH_ERROR)
8029 goto error;
8030 if (m == MATCH_YES)
8031 {
8032 if (seen_ptr)
8033 {
8034 gfc_error ("Duplicate POINTER attribute at %C");
8035 goto error;
8036 }
8037
8038 seen_ptr = true;
8039 continue;
8040 }
8041 }
8042 else
8043 {
8044 /* NON_OVERRIDABLE flag. */
8045 m = gfc_match (" non_overridable");
8046 if (m == MATCH_ERROR)
8047 goto error;
8048 if (m == MATCH_YES)
8049 {
8050 if (ba->non_overridable)
8051 {
8052 gfc_error ("Duplicate NON_OVERRIDABLE at %C");
8053 goto error;
8054 }
8055
8056 ba->non_overridable = 1;
8057 continue;
8058 }
8059
8060 /* DEFERRED flag. */
8061 m = gfc_match (" deferred");
8062 if (m == MATCH_ERROR)
8063 goto error;
8064 if (m == MATCH_YES)
8065 {
8066 if (ba->deferred)
8067 {
8068 gfc_error ("Duplicate DEFERRED at %C");
8069 goto error;
8070 }
8071
8072 ba->deferred = 1;
8073 continue;
8074 }
8075 }
8076
8077 }
8078
8079 /* Nothing matching found. */
8080 if (generic)
8081 gfc_error ("Expected access-specifier at %C");
8082 else
8083 gfc_error ("Expected binding attribute at %C");
8084 goto error;
8085 }
8086 while (gfc_match_char (',') == MATCH_YES);
8087
8088 /* NON_OVERRIDABLE and DEFERRED exclude themselves. */
8089 if (ba->non_overridable && ba->deferred)
8090 {
8091 gfc_error ("NON_OVERRIDABLE and DEFERRED can't both appear at %C");
8092 goto error;
8093 }
8094
8095 m = MATCH_YES;
8096
8097 done:
8098 if (ba->access == ACCESS_UNKNOWN)
8099 ba->access = gfc_typebound_default_access;
8100
8101 if (ppc && !seen_ptr)
8102 {
8103 gfc_error ("POINTER attribute is required for procedure pointer component"
8104 " at %C");
8105 goto error;
8106 }
8107
8108 return m;
8109
8110 error:
8111 return MATCH_ERROR;
8112 }
8113
8114
8115 /* Match a PROCEDURE specific binding inside a derived type. */
8116
8117 static match
match_procedure_in_type(void)8118 match_procedure_in_type (void)
8119 {
8120 char name[GFC_MAX_SYMBOL_LEN + 1];
8121 char target_buf[GFC_MAX_SYMBOL_LEN + 1];
8122 char* target = NULL, *ifc = NULL;
8123 gfc_typebound_proc tb;
8124 bool seen_colons;
8125 bool seen_attrs;
8126 match m;
8127 gfc_symtree* stree;
8128 gfc_namespace* ns;
8129 gfc_symbol* block;
8130 int num;
8131
8132 /* Check current state. */
8133 gcc_assert (gfc_state_stack->state == COMP_DERIVED_CONTAINS);
8134 block = gfc_state_stack->previous->sym;
8135 gcc_assert (block);
8136
8137 /* Try to match PROCEDURE(interface). */
8138 if (gfc_match (" (") == MATCH_YES)
8139 {
8140 m = gfc_match_name (target_buf);
8141 if (m == MATCH_ERROR)
8142 return m;
8143 if (m != MATCH_YES)
8144 {
8145 gfc_error ("Interface-name expected after '(' at %C");
8146 return MATCH_ERROR;
8147 }
8148
8149 if (gfc_match (" )") != MATCH_YES)
8150 {
8151 gfc_error ("')' expected at %C");
8152 return MATCH_ERROR;
8153 }
8154
8155 ifc = target_buf;
8156 }
8157
8158 /* Construct the data structure. */
8159 memset (&tb, 0, sizeof (tb));
8160 tb.where = gfc_current_locus;
8161
8162 /* Match binding attributes. */
8163 m = match_binding_attributes (&tb, false, false);
8164 if (m == MATCH_ERROR)
8165 return m;
8166 seen_attrs = (m == MATCH_YES);
8167
8168 /* Check that attribute DEFERRED is given if an interface is specified. */
8169 if (tb.deferred && !ifc)
8170 {
8171 gfc_error ("Interface must be specified for DEFERRED binding at %C");
8172 return MATCH_ERROR;
8173 }
8174 if (ifc && !tb.deferred)
8175 {
8176 gfc_error ("PROCEDURE(interface) at %C should be declared DEFERRED");
8177 return MATCH_ERROR;
8178 }
8179
8180 /* Match the colons. */
8181 m = gfc_match (" ::");
8182 if (m == MATCH_ERROR)
8183 return m;
8184 seen_colons = (m == MATCH_YES);
8185 if (seen_attrs && !seen_colons)
8186 {
8187 gfc_error ("Expected '::' after binding-attributes at %C");
8188 return MATCH_ERROR;
8189 }
8190
8191 /* Match the binding names. */
8192 for(num=1;;num++)
8193 {
8194 m = gfc_match_name (name);
8195 if (m == MATCH_ERROR)
8196 return m;
8197 if (m == MATCH_NO)
8198 {
8199 gfc_error ("Expected binding name at %C");
8200 return MATCH_ERROR;
8201 }
8202
8203 if (num>1 && gfc_notify_std (GFC_STD_F2008, "PROCEDURE list"
8204 " at %C") == FAILURE)
8205 return MATCH_ERROR;
8206
8207 /* Try to match the '=> target', if it's there. */
8208 target = ifc;
8209 m = gfc_match (" =>");
8210 if (m == MATCH_ERROR)
8211 return m;
8212 if (m == MATCH_YES)
8213 {
8214 if (tb.deferred)
8215 {
8216 gfc_error ("'=> target' is invalid for DEFERRED binding at %C");
8217 return MATCH_ERROR;
8218 }
8219
8220 if (!seen_colons)
8221 {
8222 gfc_error ("'::' needed in PROCEDURE binding with explicit target"
8223 " at %C");
8224 return MATCH_ERROR;
8225 }
8226
8227 m = gfc_match_name (target_buf);
8228 if (m == MATCH_ERROR)
8229 return m;
8230 if (m == MATCH_NO)
8231 {
8232 gfc_error ("Expected binding target after '=>' at %C");
8233 return MATCH_ERROR;
8234 }
8235 target = target_buf;
8236 }
8237
8238 /* If no target was found, it has the same name as the binding. */
8239 if (!target)
8240 target = name;
8241
8242 /* Get the namespace to insert the symbols into. */
8243 ns = block->f2k_derived;
8244 gcc_assert (ns);
8245
8246 /* If the binding is DEFERRED, check that the containing type is ABSTRACT. */
8247 if (tb.deferred && !block->attr.abstract)
8248 {
8249 gfc_error ("Type '%s' containing DEFERRED binding at %C "
8250 "is not ABSTRACT", block->name);
8251 return MATCH_ERROR;
8252 }
8253
8254 /* See if we already have a binding with this name in the symtree which
8255 would be an error. If a GENERIC already targetted this binding, it may
8256 be already there but then typebound is still NULL. */
8257 stree = gfc_find_symtree (ns->tb_sym_root, name);
8258 if (stree && stree->n.tb)
8259 {
8260 gfc_error ("There is already a procedure with binding name '%s' for "
8261 "the derived type '%s' at %C", name, block->name);
8262 return MATCH_ERROR;
8263 }
8264
8265 /* Insert it and set attributes. */
8266
8267 if (!stree)
8268 {
8269 stree = gfc_new_symtree (&ns->tb_sym_root, name);
8270 gcc_assert (stree);
8271 }
8272 stree->n.tb = gfc_get_typebound_proc (&tb);
8273
8274 if (gfc_get_sym_tree (target, gfc_current_ns, &stree->n.tb->u.specific,
8275 false))
8276 return MATCH_ERROR;
8277 gfc_set_sym_referenced (stree->n.tb->u.specific->n.sym);
8278
8279 if (gfc_match_eos () == MATCH_YES)
8280 return MATCH_YES;
8281 if (gfc_match_char (',') != MATCH_YES)
8282 goto syntax;
8283 }
8284
8285 syntax:
8286 gfc_error ("Syntax error in PROCEDURE statement at %C");
8287 return MATCH_ERROR;
8288 }
8289
8290
8291 /* Match a GENERIC procedure binding inside a derived type. */
8292
8293 match
gfc_match_generic(void)8294 gfc_match_generic (void)
8295 {
8296 char name[GFC_MAX_SYMBOL_LEN + 1];
8297 char bind_name[GFC_MAX_SYMBOL_LEN + 16]; /* Allow space for OPERATOR(...). */
8298 gfc_symbol* block;
8299 gfc_typebound_proc tbattr; /* Used for match_binding_attributes. */
8300 gfc_typebound_proc* tb;
8301 gfc_namespace* ns;
8302 interface_type op_type;
8303 gfc_intrinsic_op op;
8304 match m;
8305
8306 /* Check current state. */
8307 if (gfc_current_state () == COMP_DERIVED)
8308 {
8309 gfc_error ("GENERIC at %C must be inside a derived-type CONTAINS");
8310 return MATCH_ERROR;
8311 }
8312 if (gfc_current_state () != COMP_DERIVED_CONTAINS)
8313 return MATCH_NO;
8314 block = gfc_state_stack->previous->sym;
8315 ns = block->f2k_derived;
8316 gcc_assert (block && ns);
8317
8318 memset (&tbattr, 0, sizeof (tbattr));
8319 tbattr.where = gfc_current_locus;
8320
8321 /* See if we get an access-specifier. */
8322 m = match_binding_attributes (&tbattr, true, false);
8323 if (m == MATCH_ERROR)
8324 goto error;
8325
8326 /* Now the colons, those are required. */
8327 if (gfc_match (" ::") != MATCH_YES)
8328 {
8329 gfc_error ("Expected '::' at %C");
8330 goto error;
8331 }
8332
8333 /* Match the binding name; depending on type (operator / generic) format
8334 it for future error messages into bind_name. */
8335
8336 m = gfc_match_generic_spec (&op_type, name, &op);
8337 if (m == MATCH_ERROR)
8338 return MATCH_ERROR;
8339 if (m == MATCH_NO)
8340 {
8341 gfc_error ("Expected generic name or operator descriptor at %C");
8342 goto error;
8343 }
8344
8345 switch (op_type)
8346 {
8347 case INTERFACE_GENERIC:
8348 snprintf (bind_name, sizeof (bind_name), "%s", name);
8349 break;
8350
8351 case INTERFACE_USER_OP:
8352 snprintf (bind_name, sizeof (bind_name), "OPERATOR(.%s.)", name);
8353 break;
8354
8355 case INTERFACE_INTRINSIC_OP:
8356 snprintf (bind_name, sizeof (bind_name), "OPERATOR(%s)",
8357 gfc_op2string (op));
8358 break;
8359
8360 default:
8361 gcc_unreachable ();
8362 }
8363
8364 /* Match the required =>. */
8365 if (gfc_match (" =>") != MATCH_YES)
8366 {
8367 gfc_error ("Expected '=>' at %C");
8368 goto error;
8369 }
8370
8371 /* Try to find existing GENERIC binding with this name / for this operator;
8372 if there is something, check that it is another GENERIC and then extend
8373 it rather than building a new node. Otherwise, create it and put it
8374 at the right position. */
8375
8376 switch (op_type)
8377 {
8378 case INTERFACE_USER_OP:
8379 case INTERFACE_GENERIC:
8380 {
8381 const bool is_op = (op_type == INTERFACE_USER_OP);
8382 gfc_symtree* st;
8383
8384 st = gfc_find_symtree (is_op ? ns->tb_uop_root : ns->tb_sym_root, name);
8385 if (st)
8386 {
8387 tb = st->n.tb;
8388 gcc_assert (tb);
8389 }
8390 else
8391 tb = NULL;
8392
8393 break;
8394 }
8395
8396 case INTERFACE_INTRINSIC_OP:
8397 tb = ns->tb_op[op];
8398 break;
8399
8400 default:
8401 gcc_unreachable ();
8402 }
8403
8404 if (tb)
8405 {
8406 if (!tb->is_generic)
8407 {
8408 gcc_assert (op_type == INTERFACE_GENERIC);
8409 gfc_error ("There's already a non-generic procedure with binding name"
8410 " '%s' for the derived type '%s' at %C",
8411 bind_name, block->name);
8412 goto error;
8413 }
8414
8415 if (tb->access != tbattr.access)
8416 {
8417 gfc_error ("Binding at %C must have the same access as already"
8418 " defined binding '%s'", bind_name);
8419 goto error;
8420 }
8421 }
8422 else
8423 {
8424 tb = gfc_get_typebound_proc (NULL);
8425 tb->where = gfc_current_locus;
8426 tb->access = tbattr.access;
8427 tb->is_generic = 1;
8428 tb->u.generic = NULL;
8429
8430 switch (op_type)
8431 {
8432 case INTERFACE_GENERIC:
8433 case INTERFACE_USER_OP:
8434 {
8435 const bool is_op = (op_type == INTERFACE_USER_OP);
8436 gfc_symtree* st;
8437
8438 st = gfc_new_symtree (is_op ? &ns->tb_uop_root : &ns->tb_sym_root,
8439 name);
8440 gcc_assert (st);
8441 st->n.tb = tb;
8442
8443 break;
8444 }
8445
8446 case INTERFACE_INTRINSIC_OP:
8447 ns->tb_op[op] = tb;
8448 break;
8449
8450 default:
8451 gcc_unreachable ();
8452 }
8453 }
8454
8455 /* Now, match all following names as specific targets. */
8456 do
8457 {
8458 gfc_symtree* target_st;
8459 gfc_tbp_generic* target;
8460
8461 m = gfc_match_name (name);
8462 if (m == MATCH_ERROR)
8463 goto error;
8464 if (m == MATCH_NO)
8465 {
8466 gfc_error ("Expected specific binding name at %C");
8467 goto error;
8468 }
8469
8470 target_st = gfc_get_tbp_symtree (&ns->tb_sym_root, name);
8471
8472 /* See if this is a duplicate specification. */
8473 for (target = tb->u.generic; target; target = target->next)
8474 if (target_st == target->specific_st)
8475 {
8476 gfc_error ("'%s' already defined as specific binding for the"
8477 " generic '%s' at %C", name, bind_name);
8478 goto error;
8479 }
8480
8481 target = gfc_get_tbp_generic ();
8482 target->specific_st = target_st;
8483 target->specific = NULL;
8484 target->next = tb->u.generic;
8485 target->is_operator = ((op_type == INTERFACE_USER_OP)
8486 || (op_type == INTERFACE_INTRINSIC_OP));
8487 tb->u.generic = target;
8488 }
8489 while (gfc_match (" ,") == MATCH_YES);
8490
8491 /* Here should be the end. */
8492 if (gfc_match_eos () != MATCH_YES)
8493 {
8494 gfc_error ("Junk after GENERIC binding at %C");
8495 goto error;
8496 }
8497
8498 return MATCH_YES;
8499
8500 error:
8501 return MATCH_ERROR;
8502 }
8503
8504
8505 /* Match a FINAL declaration inside a derived type. */
8506
8507 match
gfc_match_final_decl(void)8508 gfc_match_final_decl (void)
8509 {
8510 char name[GFC_MAX_SYMBOL_LEN + 1];
8511 gfc_symbol* sym;
8512 match m;
8513 gfc_namespace* module_ns;
8514 bool first, last;
8515 gfc_symbol* block;
8516
8517 if (gfc_current_form == FORM_FREE)
8518 {
8519 char c = gfc_peek_ascii_char ();
8520 if (!gfc_is_whitespace (c) && c != ':')
8521 return MATCH_NO;
8522 }
8523
8524 if (gfc_state_stack->state != COMP_DERIVED_CONTAINS)
8525 {
8526 if (gfc_current_form == FORM_FIXED)
8527 return MATCH_NO;
8528
8529 gfc_error ("FINAL declaration at %C must be inside a derived type "
8530 "CONTAINS section");
8531 return MATCH_ERROR;
8532 }
8533
8534 block = gfc_state_stack->previous->sym;
8535 gcc_assert (block);
8536
8537 if (!gfc_state_stack->previous || !gfc_state_stack->previous->previous
8538 || gfc_state_stack->previous->previous->state != COMP_MODULE)
8539 {
8540 gfc_error ("Derived type declaration with FINAL at %C must be in the"
8541 " specification part of a MODULE");
8542 return MATCH_ERROR;
8543 }
8544
8545 module_ns = gfc_current_ns;
8546 gcc_assert (module_ns);
8547 gcc_assert (module_ns->proc_name->attr.flavor == FL_MODULE);
8548
8549 /* Match optional ::, don't care about MATCH_YES or MATCH_NO. */
8550 if (gfc_match (" ::") == MATCH_ERROR)
8551 return MATCH_ERROR;
8552
8553 /* Match the sequence of procedure names. */
8554 first = true;
8555 last = false;
8556 do
8557 {
8558 gfc_finalizer* f;
8559
8560 if (first && gfc_match_eos () == MATCH_YES)
8561 {
8562 gfc_error ("Empty FINAL at %C");
8563 return MATCH_ERROR;
8564 }
8565
8566 m = gfc_match_name (name);
8567 if (m == MATCH_NO)
8568 {
8569 gfc_error ("Expected module procedure name at %C");
8570 return MATCH_ERROR;
8571 }
8572 else if (m != MATCH_YES)
8573 return MATCH_ERROR;
8574
8575 if (gfc_match_eos () == MATCH_YES)
8576 last = true;
8577 if (!last && gfc_match_char (',') != MATCH_YES)
8578 {
8579 gfc_error ("Expected ',' at %C");
8580 return MATCH_ERROR;
8581 }
8582
8583 if (gfc_get_symbol (name, module_ns, &sym))
8584 {
8585 gfc_error ("Unknown procedure name \"%s\" at %C", name);
8586 return MATCH_ERROR;
8587 }
8588
8589 /* Mark the symbol as module procedure. */
8590 if (sym->attr.proc != PROC_MODULE
8591 && gfc_add_procedure (&sym->attr, PROC_MODULE,
8592 sym->name, NULL) == FAILURE)
8593 return MATCH_ERROR;
8594
8595 /* Check if we already have this symbol in the list, this is an error. */
8596 for (f = block->f2k_derived->finalizers; f; f = f->next)
8597 if (f->proc_sym == sym)
8598 {
8599 gfc_error ("'%s' at %C is already defined as FINAL procedure!",
8600 name);
8601 return MATCH_ERROR;
8602 }
8603
8604 /* Add this symbol to the list of finalizers. */
8605 gcc_assert (block->f2k_derived);
8606 ++sym->refs;
8607 f = XCNEW (gfc_finalizer);
8608 f->proc_sym = sym;
8609 f->proc_tree = NULL;
8610 f->where = gfc_current_locus;
8611 f->next = block->f2k_derived->finalizers;
8612 block->f2k_derived->finalizers = f;
8613
8614 first = false;
8615 }
8616 while (!last);
8617
8618 return MATCH_YES;
8619 }
8620
8621
8622 const ext_attr_t ext_attr_list[] = {
8623 { "dllimport", EXT_ATTR_DLLIMPORT, "dllimport" },
8624 { "dllexport", EXT_ATTR_DLLEXPORT, "dllexport" },
8625 { "cdecl", EXT_ATTR_CDECL, "cdecl" },
8626 { "stdcall", EXT_ATTR_STDCALL, "stdcall" },
8627 { "fastcall", EXT_ATTR_FASTCALL, "fastcall" },
8628 { NULL, EXT_ATTR_LAST, NULL }
8629 };
8630
8631 /* Match a !GCC$ ATTRIBUTES statement of the form:
8632 !GCC$ ATTRIBUTES attribute-list :: var-name [, var-name] ...
8633 When we come here, we have already matched the !GCC$ ATTRIBUTES string.
8634
8635 TODO: We should support all GCC attributes using the same syntax for
8636 the attribute list, i.e. the list in C
8637 __attributes(( attribute-list ))
8638 matches then
8639 !GCC$ ATTRIBUTES attribute-list ::
8640 Cf. c-parser.c's c_parser_attributes; the data can then directly be
8641 saved into a TREE.
8642
8643 As there is absolutely no risk of confusion, we should never return
8644 MATCH_NO. */
8645 match
gfc_match_gcc_attributes(void)8646 gfc_match_gcc_attributes (void)
8647 {
8648 symbol_attribute attr;
8649 char name[GFC_MAX_SYMBOL_LEN + 1];
8650 unsigned id;
8651 gfc_symbol *sym;
8652 match m;
8653
8654 gfc_clear_attr (&attr);
8655 for(;;)
8656 {
8657 char ch;
8658
8659 if (gfc_match_name (name) != MATCH_YES)
8660 return MATCH_ERROR;
8661
8662 for (id = 0; id < EXT_ATTR_LAST; id++)
8663 if (strcmp (name, ext_attr_list[id].name) == 0)
8664 break;
8665
8666 if (id == EXT_ATTR_LAST)
8667 {
8668 gfc_error ("Unknown attribute in !GCC$ ATTRIBUTES statement at %C");
8669 return MATCH_ERROR;
8670 }
8671
8672 if (gfc_add_ext_attribute (&attr, (ext_attr_id_t) id, &gfc_current_locus)
8673 == FAILURE)
8674 return MATCH_ERROR;
8675
8676 gfc_gobble_whitespace ();
8677 ch = gfc_next_ascii_char ();
8678 if (ch == ':')
8679 {
8680 /* This is the successful exit condition for the loop. */
8681 if (gfc_next_ascii_char () == ':')
8682 break;
8683 }
8684
8685 if (ch == ',')
8686 continue;
8687
8688 goto syntax;
8689 }
8690
8691 if (gfc_match_eos () == MATCH_YES)
8692 goto syntax;
8693
8694 for(;;)
8695 {
8696 m = gfc_match_name (name);
8697 if (m != MATCH_YES)
8698 return m;
8699
8700 if (find_special (name, &sym, true))
8701 return MATCH_ERROR;
8702
8703 sym->attr.ext_attr |= attr.ext_attr;
8704
8705 if (gfc_match_eos () == MATCH_YES)
8706 break;
8707
8708 if (gfc_match_char (',') != MATCH_YES)
8709 goto syntax;
8710 }
8711
8712 return MATCH_YES;
8713
8714 syntax:
8715 gfc_error ("Syntax error in !GCC$ ATTRIBUTES statement at %C");
8716 return MATCH_ERROR;
8717 }
8718