1 /* Maintain binary trees of symbols.
2 Copyright (C) 2000-2020 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
22 #include "config.h"
23 #include "system.h"
24 #include "coretypes.h"
25 #include "options.h"
26 #include "gfortran.h"
27 #include "parse.h"
28 #include "match.h"
29 #include "constructor.h"
30
31
32 /* Strings for all symbol attributes. We use these for dumping the
33 parse tree, in error messages, and also when reading and writing
34 modules. */
35
36 const mstring flavors[] =
37 {
38 minit ("UNKNOWN-FL", FL_UNKNOWN), minit ("PROGRAM", FL_PROGRAM),
39 minit ("BLOCK-DATA", FL_BLOCK_DATA), minit ("MODULE", FL_MODULE),
40 minit ("VARIABLE", FL_VARIABLE), minit ("PARAMETER", FL_PARAMETER),
41 minit ("LABEL", FL_LABEL), minit ("PROCEDURE", FL_PROCEDURE),
42 minit ("DERIVED", FL_DERIVED), minit ("NAMELIST", FL_NAMELIST),
43 minit ("UNION", FL_UNION), minit ("STRUCTURE", FL_STRUCT),
44 minit (NULL, -1)
45 };
46
47 const mstring procedures[] =
48 {
49 minit ("UNKNOWN-PROC", PROC_UNKNOWN),
50 minit ("MODULE-PROC", PROC_MODULE),
51 minit ("INTERNAL-PROC", PROC_INTERNAL),
52 minit ("DUMMY-PROC", PROC_DUMMY),
53 minit ("INTRINSIC-PROC", PROC_INTRINSIC),
54 minit ("EXTERNAL-PROC", PROC_EXTERNAL),
55 minit ("STATEMENT-PROC", PROC_ST_FUNCTION),
56 minit (NULL, -1)
57 };
58
59 const mstring intents[] =
60 {
61 minit ("UNKNOWN-INTENT", INTENT_UNKNOWN),
62 minit ("IN", INTENT_IN),
63 minit ("OUT", INTENT_OUT),
64 minit ("INOUT", INTENT_INOUT),
65 minit (NULL, -1)
66 };
67
68 const mstring access_types[] =
69 {
70 minit ("UNKNOWN-ACCESS", ACCESS_UNKNOWN),
71 minit ("PUBLIC", ACCESS_PUBLIC),
72 minit ("PRIVATE", ACCESS_PRIVATE),
73 minit (NULL, -1)
74 };
75
76 const mstring ifsrc_types[] =
77 {
78 minit ("UNKNOWN", IFSRC_UNKNOWN),
79 minit ("DECL", IFSRC_DECL),
80 minit ("BODY", IFSRC_IFBODY)
81 };
82
83 const mstring save_status[] =
84 {
85 minit ("UNKNOWN", SAVE_NONE),
86 minit ("EXPLICIT-SAVE", SAVE_EXPLICIT),
87 minit ("IMPLICIT-SAVE", SAVE_IMPLICIT),
88 };
89
90 /* Set the mstrings for DTIO procedure names. */
91 const mstring dtio_procs[] =
92 {
93 minit ("_dtio_formatted_read", DTIO_RF),
94 minit ("_dtio_formatted_write", DTIO_WF),
95 minit ("_dtio_unformatted_read", DTIO_RUF),
96 minit ("_dtio_unformatted_write", DTIO_WUF),
97 };
98
99 /* This is to make sure the backend generates setup code in the correct
100 order. */
101
102 static int next_dummy_order = 1;
103
104
105 gfc_namespace *gfc_current_ns;
106 gfc_namespace *gfc_global_ns_list;
107
108 gfc_gsymbol *gfc_gsym_root = NULL;
109
110 gfc_symbol *gfc_derived_types;
111
112 static gfc_undo_change_set default_undo_chgset_var = { vNULL, vNULL, NULL };
113 static gfc_undo_change_set *latest_undo_chgset = &default_undo_chgset_var;
114
115
116 /*********** IMPLICIT NONE and IMPLICIT statement handlers ***********/
117
118 /* The following static variable indicates whether a particular element has
119 been explicitly set or not. */
120
121 static int new_flag[GFC_LETTERS];
122
123
124 /* Handle a correctly parsed IMPLICIT NONE. */
125
126 void
gfc_set_implicit_none(bool type,bool external,locus * loc)127 gfc_set_implicit_none (bool type, bool external, locus *loc)
128 {
129 int i;
130
131 if (external)
132 gfc_current_ns->has_implicit_none_export = 1;
133
134 if (type)
135 {
136 gfc_current_ns->seen_implicit_none = 1;
137 for (i = 0; i < GFC_LETTERS; i++)
138 {
139 if (gfc_current_ns->set_flag[i])
140 {
141 gfc_error_now ("IMPLICIT NONE (type) statement at %L following an "
142 "IMPLICIT statement", loc);
143 return;
144 }
145 gfc_clear_ts (&gfc_current_ns->default_type[i]);
146 gfc_current_ns->set_flag[i] = 1;
147 }
148 }
149 }
150
151
152 /* Reset the implicit range flags. */
153
154 void
gfc_clear_new_implicit(void)155 gfc_clear_new_implicit (void)
156 {
157 int i;
158
159 for (i = 0; i < GFC_LETTERS; i++)
160 new_flag[i] = 0;
161 }
162
163
164 /* Prepare for a new implicit range. Sets flags in new_flag[]. */
165
166 bool
gfc_add_new_implicit_range(int c1,int c2)167 gfc_add_new_implicit_range (int c1, int c2)
168 {
169 int i;
170
171 c1 -= 'a';
172 c2 -= 'a';
173
174 for (i = c1; i <= c2; i++)
175 {
176 if (new_flag[i])
177 {
178 gfc_error ("Letter %qc already set in IMPLICIT statement at %C",
179 i + 'A');
180 return false;
181 }
182
183 new_flag[i] = 1;
184 }
185
186 return true;
187 }
188
189
190 /* Add a matched implicit range for gfc_set_implicit(). Check if merging
191 the new implicit types back into the existing types will work. */
192
193 bool
gfc_merge_new_implicit(gfc_typespec * ts)194 gfc_merge_new_implicit (gfc_typespec *ts)
195 {
196 int i;
197
198 if (gfc_current_ns->seen_implicit_none)
199 {
200 gfc_error ("Cannot specify IMPLICIT at %C after IMPLICIT NONE");
201 return false;
202 }
203
204 for (i = 0; i < GFC_LETTERS; i++)
205 {
206 if (new_flag[i])
207 {
208 if (gfc_current_ns->set_flag[i])
209 {
210 gfc_error ("Letter %qc already has an IMPLICIT type at %C",
211 i + 'A');
212 return false;
213 }
214
215 gfc_current_ns->default_type[i] = *ts;
216 gfc_current_ns->implicit_loc[i] = gfc_current_locus;
217 gfc_current_ns->set_flag[i] = 1;
218 }
219 }
220 return true;
221 }
222
223
224 /* Given a symbol, return a pointer to the typespec for its default type. */
225
226 gfc_typespec *
gfc_get_default_type(const char * name,gfc_namespace * ns)227 gfc_get_default_type (const char *name, gfc_namespace *ns)
228 {
229 char letter;
230
231 letter = name[0];
232
233 if (flag_allow_leading_underscore && letter == '_')
234 gfc_fatal_error ("Option %<-fallow-leading-underscore%> is for use only by "
235 "gfortran developers, and should not be used for "
236 "implicitly typed variables");
237
238 if (letter < 'a' || letter > 'z')
239 gfc_internal_error ("gfc_get_default_type(): Bad symbol %qs", name);
240
241 if (ns == NULL)
242 ns = gfc_current_ns;
243
244 return &ns->default_type[letter - 'a'];
245 }
246
247
248 /* Recursively append candidate SYM to CANDIDATES. Store the number of
249 candidates in CANDIDATES_LEN. */
250
251 static void
lookup_symbol_fuzzy_find_candidates(gfc_symtree * sym,char ** & candidates,size_t & candidates_len)252 lookup_symbol_fuzzy_find_candidates (gfc_symtree *sym,
253 char **&candidates,
254 size_t &candidates_len)
255 {
256 gfc_symtree *p;
257
258 if (sym == NULL)
259 return;
260
261 if (sym->n.sym->ts.type != BT_UNKNOWN && sym->n.sym->ts.type != BT_PROCEDURE)
262 vec_push (candidates, candidates_len, sym->name);
263 p = sym->left;
264 if (p)
265 lookup_symbol_fuzzy_find_candidates (p, candidates, candidates_len);
266
267 p = sym->right;
268 if (p)
269 lookup_symbol_fuzzy_find_candidates (p, candidates, candidates_len);
270 }
271
272
273 /* Lookup symbol SYM_NAME fuzzily, taking names in SYMBOL into account. */
274
275 static const char*
lookup_symbol_fuzzy(const char * sym_name,gfc_symbol * symbol)276 lookup_symbol_fuzzy (const char *sym_name, gfc_symbol *symbol)
277 {
278 char **candidates = NULL;
279 size_t candidates_len = 0;
280 lookup_symbol_fuzzy_find_candidates (symbol->ns->sym_root, candidates,
281 candidates_len);
282 return gfc_closest_fuzzy_match (sym_name, candidates);
283 }
284
285
286 /* Given a pointer to a symbol, set its type according to the first
287 letter of its name. Fails if the letter in question has no default
288 type. */
289
290 bool
gfc_set_default_type(gfc_symbol * sym,int error_flag,gfc_namespace * ns)291 gfc_set_default_type (gfc_symbol *sym, int error_flag, gfc_namespace *ns)
292 {
293 gfc_typespec *ts;
294
295 if (sym->ts.type != BT_UNKNOWN)
296 gfc_internal_error ("gfc_set_default_type(): symbol already has a type");
297
298 ts = gfc_get_default_type (sym->name, ns);
299
300 if (ts->type == BT_UNKNOWN)
301 {
302 if (error_flag && !sym->attr.untyped)
303 {
304 const char *guessed = lookup_symbol_fuzzy (sym->name, sym);
305 if (guessed)
306 gfc_error ("Symbol %qs at %L has no IMPLICIT type"
307 "; did you mean %qs?",
308 sym->name, &sym->declared_at, guessed);
309 else
310 gfc_error ("Symbol %qs at %L has no IMPLICIT type",
311 sym->name, &sym->declared_at);
312 sym->attr.untyped = 1; /* Ensure we only give an error once. */
313 }
314
315 return false;
316 }
317
318 sym->ts = *ts;
319 sym->attr.implicit_type = 1;
320
321 if (ts->type == BT_CHARACTER && ts->u.cl)
322 sym->ts.u.cl = gfc_new_charlen (sym->ns, ts->u.cl);
323 else if (ts->type == BT_CLASS
324 && !gfc_build_class_symbol (&sym->ts, &sym->attr, &sym->as))
325 return false;
326
327 if (sym->attr.is_bind_c == 1 && warn_c_binding_type)
328 {
329 /* BIND(C) variables should not be implicitly declared. */
330 gfc_warning_now (OPT_Wc_binding_type, "Implicitly declared BIND(C) "
331 "variable %qs at %L may not be C interoperable",
332 sym->name, &sym->declared_at);
333 sym->ts.f90_type = sym->ts.type;
334 }
335
336 if (sym->attr.dummy != 0)
337 {
338 if (sym->ns->proc_name != NULL
339 && (sym->ns->proc_name->attr.subroutine != 0
340 || sym->ns->proc_name->attr.function != 0)
341 && sym->ns->proc_name->attr.is_bind_c != 0
342 && warn_c_binding_type)
343 {
344 /* Dummy args to a BIND(C) routine may not be interoperable if
345 they are implicitly typed. */
346 gfc_warning_now (OPT_Wc_binding_type, "Implicitly declared variable "
347 "%qs at %L may not be C interoperable but it is a "
348 "dummy argument to the BIND(C) procedure %qs at %L",
349 sym->name, &(sym->declared_at),
350 sym->ns->proc_name->name,
351 &(sym->ns->proc_name->declared_at));
352 sym->ts.f90_type = sym->ts.type;
353 }
354 }
355
356 return true;
357 }
358
359
360 /* This function is called from parse.c(parse_progunit) to check the
361 type of the function is not implicitly typed in the host namespace
362 and to implicitly type the function result, if necessary. */
363
364 void
gfc_check_function_type(gfc_namespace * ns)365 gfc_check_function_type (gfc_namespace *ns)
366 {
367 gfc_symbol *proc = ns->proc_name;
368
369 if (!proc->attr.contained || proc->result->attr.implicit_type)
370 return;
371
372 if (proc->result->ts.type == BT_UNKNOWN && proc->result->ts.interface == NULL)
373 {
374 if (gfc_set_default_type (proc->result, 0, gfc_current_ns))
375 {
376 if (proc->result != proc)
377 {
378 proc->ts = proc->result->ts;
379 proc->as = gfc_copy_array_spec (proc->result->as);
380 proc->attr.dimension = proc->result->attr.dimension;
381 proc->attr.pointer = proc->result->attr.pointer;
382 proc->attr.allocatable = proc->result->attr.allocatable;
383 }
384 }
385 else if (!proc->result->attr.proc_pointer)
386 {
387 gfc_error ("Function result %qs at %L has no IMPLICIT type",
388 proc->result->name, &proc->result->declared_at);
389 proc->result->attr.untyped = 1;
390 }
391 }
392 }
393
394
395 /******************** Symbol attribute stuff *********************/
396
397 /* This is a generic conflict-checker. We do this to avoid having a
398 single conflict in two places. */
399
400 #define conf(a, b) if (attr->a && attr->b) { a1 = a; a2 = b; goto conflict; }
401 #define conf2(a) if (attr->a) { a2 = a; goto conflict; }
402 #define conf_std(a, b, std) if (attr->a && attr->b)\
403 {\
404 a1 = a;\
405 a2 = b;\
406 standard = std;\
407 goto conflict_std;\
408 }
409
410 bool
gfc_check_conflict(symbol_attribute * attr,const char * name,locus * where)411 gfc_check_conflict (symbol_attribute *attr, const char *name, locus *where)
412 {
413 static const char *dummy = "DUMMY", *save = "SAVE", *pointer = "POINTER",
414 *target = "TARGET", *external = "EXTERNAL", *intent = "INTENT",
415 *intent_in = "INTENT(IN)", *intrinsic = "INTRINSIC",
416 *intent_out = "INTENT(OUT)", *intent_inout = "INTENT(INOUT)",
417 *allocatable = "ALLOCATABLE", *elemental = "ELEMENTAL",
418 *privat = "PRIVATE", *recursive = "RECURSIVE",
419 *in_common = "COMMON", *result = "RESULT", *in_namelist = "NAMELIST",
420 *publik = "PUBLIC", *optional = "OPTIONAL", *entry = "ENTRY",
421 *function = "FUNCTION", *subroutine = "SUBROUTINE",
422 *dimension = "DIMENSION", *in_equivalence = "EQUIVALENCE",
423 *use_assoc = "USE ASSOCIATED", *cray_pointer = "CRAY POINTER",
424 *cray_pointee = "CRAY POINTEE", *data = "DATA", *value = "VALUE",
425 *volatile_ = "VOLATILE", *is_protected = "PROTECTED",
426 *is_bind_c = "BIND(C)", *procedure = "PROCEDURE",
427 *proc_pointer = "PROCEDURE POINTER", *abstract = "ABSTRACT",
428 *asynchronous = "ASYNCHRONOUS", *codimension = "CODIMENSION",
429 *contiguous = "CONTIGUOUS", *generic = "GENERIC", *automatic = "AUTOMATIC",
430 *pdt_len = "LEN", *pdt_kind = "KIND";
431 static const char *threadprivate = "THREADPRIVATE";
432 static const char *omp_declare_target = "OMP DECLARE TARGET";
433 static const char *omp_declare_target_link = "OMP DECLARE TARGET LINK";
434 static const char *oacc_declare_copyin = "OACC DECLARE COPYIN";
435 static const char *oacc_declare_create = "OACC DECLARE CREATE";
436 static const char *oacc_declare_deviceptr = "OACC DECLARE DEVICEPTR";
437 static const char *oacc_declare_device_resident =
438 "OACC DECLARE DEVICE_RESIDENT";
439
440 const char *a1, *a2;
441 int standard;
442
443 if (attr->artificial)
444 return true;
445
446 if (where == NULL)
447 where = &gfc_current_locus;
448
449 if (attr->pointer && attr->intent != INTENT_UNKNOWN)
450 {
451 a1 = pointer;
452 a2 = intent;
453 standard = GFC_STD_F2003;
454 goto conflict_std;
455 }
456
457 if (attr->in_namelist && (attr->allocatable || attr->pointer))
458 {
459 a1 = in_namelist;
460 a2 = attr->allocatable ? allocatable : pointer;
461 standard = GFC_STD_F2003;
462 goto conflict_std;
463 }
464
465 /* Check for attributes not allowed in a BLOCK DATA. */
466 if (gfc_current_state () == COMP_BLOCK_DATA)
467 {
468 a1 = NULL;
469
470 if (attr->in_namelist)
471 a1 = in_namelist;
472 if (attr->allocatable)
473 a1 = allocatable;
474 if (attr->external)
475 a1 = external;
476 if (attr->optional)
477 a1 = optional;
478 if (attr->access == ACCESS_PRIVATE)
479 a1 = privat;
480 if (attr->access == ACCESS_PUBLIC)
481 a1 = publik;
482 if (attr->intent != INTENT_UNKNOWN)
483 a1 = intent;
484
485 if (a1 != NULL)
486 {
487 gfc_error
488 ("%s attribute not allowed in BLOCK DATA program unit at %L",
489 a1, where);
490 return false;
491 }
492 }
493
494 if (attr->save == SAVE_EXPLICIT)
495 {
496 conf (dummy, save);
497 conf (in_common, save);
498 conf (result, save);
499 conf (automatic, save);
500
501 switch (attr->flavor)
502 {
503 case FL_PROGRAM:
504 case FL_BLOCK_DATA:
505 case FL_MODULE:
506 case FL_LABEL:
507 case_fl_struct:
508 case FL_PARAMETER:
509 a1 = gfc_code2string (flavors, attr->flavor);
510 a2 = save;
511 goto conflict;
512 case FL_NAMELIST:
513 gfc_error ("Namelist group name at %L cannot have the "
514 "SAVE attribute", where);
515 return false;
516 case FL_PROCEDURE:
517 /* Conflicts between SAVE and PROCEDURE will be checked at
518 resolution stage, see "resolve_fl_procedure". */
519 case FL_VARIABLE:
520 default:
521 break;
522 }
523 }
524
525 /* The copying of procedure dummy arguments for module procedures in
526 a submodule occur whilst the current state is COMP_CONTAINS. It
527 is necessary, therefore, to let this through. */
528 if (name && attr->dummy
529 && (attr->function || attr->subroutine)
530 && gfc_current_state () == COMP_CONTAINS
531 && !(gfc_new_block && gfc_new_block->abr_modproc_decl))
532 gfc_error_now ("internal procedure %qs at %L conflicts with "
533 "DUMMY argument", name, where);
534
535 conf (dummy, entry);
536 conf (dummy, intrinsic);
537 conf (dummy, threadprivate);
538 conf (dummy, omp_declare_target);
539 conf (dummy, omp_declare_target_link);
540 conf (pointer, target);
541 conf (pointer, intrinsic);
542 conf (pointer, elemental);
543 conf (pointer, codimension);
544 conf (allocatable, elemental);
545
546 conf (in_common, automatic);
547 conf (result, automatic);
548 conf (use_assoc, automatic);
549 conf (dummy, automatic);
550
551 conf (target, external);
552 conf (target, intrinsic);
553
554 if (!attr->if_source)
555 conf (external, dimension); /* See Fortran 95's R504. */
556
557 conf (external, intrinsic);
558 conf (entry, intrinsic);
559 conf (abstract, intrinsic);
560
561 if ((attr->if_source == IFSRC_DECL && !attr->procedure) || attr->contained)
562 conf (external, subroutine);
563
564 if (attr->proc_pointer && !gfc_notify_std (GFC_STD_F2003,
565 "Procedure pointer at %C"))
566 return false;
567
568 conf (allocatable, pointer);
569 conf_std (allocatable, dummy, GFC_STD_F2003);
570 conf_std (allocatable, function, GFC_STD_F2003);
571 conf_std (allocatable, result, GFC_STD_F2003);
572 conf (elemental, recursive);
573
574 conf (in_common, dummy);
575 conf (in_common, allocatable);
576 conf (in_common, codimension);
577 conf (in_common, result);
578
579 conf (in_equivalence, use_assoc);
580 conf (in_equivalence, codimension);
581 conf (in_equivalence, dummy);
582 conf (in_equivalence, target);
583 conf (in_equivalence, pointer);
584 conf (in_equivalence, function);
585 conf (in_equivalence, result);
586 conf (in_equivalence, entry);
587 conf (in_equivalence, allocatable);
588 conf (in_equivalence, threadprivate);
589 conf (in_equivalence, omp_declare_target);
590 conf (in_equivalence, omp_declare_target_link);
591 conf (in_equivalence, oacc_declare_create);
592 conf (in_equivalence, oacc_declare_copyin);
593 conf (in_equivalence, oacc_declare_deviceptr);
594 conf (in_equivalence, oacc_declare_device_resident);
595 conf (in_equivalence, is_bind_c);
596
597 conf (dummy, result);
598 conf (entry, result);
599 conf (generic, result);
600 conf (generic, omp_declare_target);
601 conf (generic, omp_declare_target_link);
602
603 conf (function, subroutine);
604
605 if (!function && !subroutine)
606 conf (is_bind_c, dummy);
607
608 conf (is_bind_c, cray_pointer);
609 conf (is_bind_c, cray_pointee);
610 conf (is_bind_c, codimension);
611 conf (is_bind_c, allocatable);
612 conf (is_bind_c, elemental);
613
614 /* Need to also get volatile attr, according to 5.1 of F2003 draft.
615 Parameter conflict caught below. Also, value cannot be specified
616 for a dummy procedure. */
617
618 /* Cray pointer/pointee conflicts. */
619 conf (cray_pointer, cray_pointee);
620 conf (cray_pointer, dimension);
621 conf (cray_pointer, codimension);
622 conf (cray_pointer, contiguous);
623 conf (cray_pointer, pointer);
624 conf (cray_pointer, target);
625 conf (cray_pointer, allocatable);
626 conf (cray_pointer, external);
627 conf (cray_pointer, intrinsic);
628 conf (cray_pointer, in_namelist);
629 conf (cray_pointer, function);
630 conf (cray_pointer, subroutine);
631 conf (cray_pointer, entry);
632
633 conf (cray_pointee, allocatable);
634 conf (cray_pointee, contiguous);
635 conf (cray_pointee, codimension);
636 conf (cray_pointee, intent);
637 conf (cray_pointee, optional);
638 conf (cray_pointee, dummy);
639 conf (cray_pointee, target);
640 conf (cray_pointee, intrinsic);
641 conf (cray_pointee, pointer);
642 conf (cray_pointee, entry);
643 conf (cray_pointee, in_common);
644 conf (cray_pointee, in_equivalence);
645 conf (cray_pointee, threadprivate);
646 conf (cray_pointee, omp_declare_target);
647 conf (cray_pointee, omp_declare_target_link);
648 conf (cray_pointee, oacc_declare_create);
649 conf (cray_pointee, oacc_declare_copyin);
650 conf (cray_pointee, oacc_declare_deviceptr);
651 conf (cray_pointee, oacc_declare_device_resident);
652
653 conf (data, dummy);
654 conf (data, function);
655 conf (data, result);
656 conf (data, allocatable);
657
658 conf (value, pointer)
659 conf (value, allocatable)
660 conf (value, subroutine)
661 conf (value, function)
662 conf (value, volatile_)
663 conf (value, dimension)
664 conf (value, codimension)
665 conf (value, external)
666
667 conf (codimension, result)
668
669 if (attr->value
670 && (attr->intent == INTENT_OUT || attr->intent == INTENT_INOUT))
671 {
672 a1 = value;
673 a2 = attr->intent == INTENT_OUT ? intent_out : intent_inout;
674 goto conflict;
675 }
676
677 conf (is_protected, intrinsic)
678 conf (is_protected, in_common)
679
680 conf (asynchronous, intrinsic)
681 conf (asynchronous, external)
682
683 conf (volatile_, intrinsic)
684 conf (volatile_, external)
685
686 if (attr->volatile_ && attr->intent == INTENT_IN)
687 {
688 a1 = volatile_;
689 a2 = intent_in;
690 goto conflict;
691 }
692
693 conf (procedure, allocatable)
694 conf (procedure, dimension)
695 conf (procedure, codimension)
696 conf (procedure, intrinsic)
697 conf (procedure, target)
698 conf (procedure, value)
699 conf (procedure, volatile_)
700 conf (procedure, asynchronous)
701 conf (procedure, entry)
702
703 conf (proc_pointer, abstract)
704 conf (proc_pointer, omp_declare_target)
705 conf (proc_pointer, omp_declare_target_link)
706
707 conf (entry, omp_declare_target)
708 conf (entry, omp_declare_target_link)
709 conf (entry, oacc_declare_create)
710 conf (entry, oacc_declare_copyin)
711 conf (entry, oacc_declare_deviceptr)
712 conf (entry, oacc_declare_device_resident)
713
714 conf (pdt_kind, allocatable)
715 conf (pdt_kind, pointer)
716 conf (pdt_kind, dimension)
717 conf (pdt_kind, codimension)
718
719 conf (pdt_len, allocatable)
720 conf (pdt_len, pointer)
721 conf (pdt_len, dimension)
722 conf (pdt_len, codimension)
723
724 if (attr->access == ACCESS_PRIVATE)
725 {
726 a1 = privat;
727 conf2 (pdt_kind);
728 conf2 (pdt_len);
729 }
730
731 a1 = gfc_code2string (flavors, attr->flavor);
732
733 if (attr->in_namelist
734 && attr->flavor != FL_VARIABLE
735 && attr->flavor != FL_PROCEDURE
736 && attr->flavor != FL_UNKNOWN)
737 {
738 a2 = in_namelist;
739 goto conflict;
740 }
741
742 switch (attr->flavor)
743 {
744 case FL_PROGRAM:
745 case FL_BLOCK_DATA:
746 case FL_MODULE:
747 case FL_LABEL:
748 conf2 (codimension);
749 conf2 (dimension);
750 conf2 (dummy);
751 conf2 (volatile_);
752 conf2 (asynchronous);
753 conf2 (contiguous);
754 conf2 (pointer);
755 conf2 (is_protected);
756 conf2 (target);
757 conf2 (external);
758 conf2 (intrinsic);
759 conf2 (allocatable);
760 conf2 (result);
761 conf2 (in_namelist);
762 conf2 (optional);
763 conf2 (function);
764 conf2 (subroutine);
765 conf2 (threadprivate);
766 conf2 (omp_declare_target);
767 conf2 (omp_declare_target_link);
768 conf2 (oacc_declare_create);
769 conf2 (oacc_declare_copyin);
770 conf2 (oacc_declare_deviceptr);
771 conf2 (oacc_declare_device_resident);
772
773 if (attr->access == ACCESS_PUBLIC || attr->access == ACCESS_PRIVATE)
774 {
775 a2 = attr->access == ACCESS_PUBLIC ? publik : privat;
776 gfc_error ("%s attribute applied to %s %s at %L", a2, a1,
777 name, where);
778 return false;
779 }
780
781 if (attr->is_bind_c)
782 {
783 gfc_error_now ("BIND(C) applied to %s %s at %L", a1, name, where);
784 return false;
785 }
786
787 break;
788
789 case FL_VARIABLE:
790 break;
791
792 case FL_NAMELIST:
793 conf2 (result);
794 break;
795
796 case FL_PROCEDURE:
797 /* Conflicts with INTENT, SAVE and RESULT will be checked
798 at resolution stage, see "resolve_fl_procedure". */
799
800 if (attr->subroutine)
801 {
802 a1 = subroutine;
803 conf2 (target);
804 conf2 (allocatable);
805 conf2 (volatile_);
806 conf2 (asynchronous);
807 conf2 (in_namelist);
808 conf2 (codimension);
809 conf2 (dimension);
810 conf2 (function);
811 if (!attr->proc_pointer)
812 conf2 (threadprivate);
813 }
814
815 /* Procedure pointers in COMMON blocks are allowed in F03,
816 * but forbidden per F08:C5100. */
817 if (!attr->proc_pointer || (gfc_option.allow_std & GFC_STD_F2008))
818 conf2 (in_common);
819
820 conf2 (omp_declare_target_link);
821
822 switch (attr->proc)
823 {
824 case PROC_ST_FUNCTION:
825 conf2 (dummy);
826 conf2 (target);
827 break;
828
829 case PROC_MODULE:
830 conf2 (dummy);
831 break;
832
833 case PROC_DUMMY:
834 conf2 (result);
835 conf2 (threadprivate);
836 break;
837
838 default:
839 break;
840 }
841
842 break;
843
844 case_fl_struct:
845 conf2 (dummy);
846 conf2 (pointer);
847 conf2 (target);
848 conf2 (external);
849 conf2 (intrinsic);
850 conf2 (allocatable);
851 conf2 (optional);
852 conf2 (entry);
853 conf2 (function);
854 conf2 (subroutine);
855 conf2 (threadprivate);
856 conf2 (result);
857 conf2 (omp_declare_target);
858 conf2 (omp_declare_target_link);
859 conf2 (oacc_declare_create);
860 conf2 (oacc_declare_copyin);
861 conf2 (oacc_declare_deviceptr);
862 conf2 (oacc_declare_device_resident);
863
864 if (attr->intent != INTENT_UNKNOWN)
865 {
866 a2 = intent;
867 goto conflict;
868 }
869 break;
870
871 case FL_PARAMETER:
872 conf2 (external);
873 conf2 (intrinsic);
874 conf2 (optional);
875 conf2 (allocatable);
876 conf2 (function);
877 conf2 (subroutine);
878 conf2 (entry);
879 conf2 (contiguous);
880 conf2 (pointer);
881 conf2 (is_protected);
882 conf2 (target);
883 conf2 (dummy);
884 conf2 (in_common);
885 conf2 (value);
886 conf2 (volatile_);
887 conf2 (asynchronous);
888 conf2 (threadprivate);
889 conf2 (value);
890 conf2 (codimension);
891 conf2 (result);
892 if (!attr->is_iso_c)
893 conf2 (is_bind_c);
894 break;
895
896 default:
897 break;
898 }
899
900 return true;
901
902 conflict:
903 if (name == NULL)
904 gfc_error ("%s attribute conflicts with %s attribute at %L",
905 a1, a2, where);
906 else
907 gfc_error ("%s attribute conflicts with %s attribute in %qs at %L",
908 a1, a2, name, where);
909
910 return false;
911
912 conflict_std:
913 if (name == NULL)
914 {
915 return gfc_notify_std (standard, "%s attribute conflicts "
916 "with %s attribute at %L", a1, a2,
917 where);
918 }
919 else
920 {
921 return gfc_notify_std (standard, "%s attribute conflicts "
922 "with %s attribute in %qs at %L",
923 a1, a2, name, where);
924 }
925 }
926
927 #undef conf
928 #undef conf2
929 #undef conf_std
930
931
932 /* Mark a symbol as referenced. */
933
934 void
gfc_set_sym_referenced(gfc_symbol * sym)935 gfc_set_sym_referenced (gfc_symbol *sym)
936 {
937
938 if (sym->attr.referenced)
939 return;
940
941 sym->attr.referenced = 1;
942
943 /* Remember which order dummy variables are accessed in. */
944 if (sym->attr.dummy)
945 sym->dummy_order = next_dummy_order++;
946 }
947
948
949 /* Common subroutine called by attribute changing subroutines in order
950 to prevent them from changing a symbol that has been
951 use-associated. Returns zero if it is OK to change the symbol,
952 nonzero if not. */
953
954 static int
check_used(symbol_attribute * attr,const char * name,locus * where)955 check_used (symbol_attribute *attr, const char *name, locus *where)
956 {
957
958 if (attr->use_assoc == 0)
959 return 0;
960
961 if (where == NULL)
962 where = &gfc_current_locus;
963
964 if (name == NULL)
965 gfc_error ("Cannot change attributes of USE-associated symbol at %L",
966 where);
967 else
968 gfc_error ("Cannot change attributes of USE-associated symbol %s at %L",
969 name, where);
970
971 return 1;
972 }
973
974
975 /* Generate an error because of a duplicate attribute. */
976
977 static void
duplicate_attr(const char * attr,locus * where)978 duplicate_attr (const char *attr, locus *where)
979 {
980
981 if (where == NULL)
982 where = &gfc_current_locus;
983
984 gfc_error ("Duplicate %s attribute specified at %L", attr, where);
985 }
986
987
988 bool
gfc_add_ext_attribute(symbol_attribute * attr,ext_attr_id_t ext_attr,locus * where ATTRIBUTE_UNUSED)989 gfc_add_ext_attribute (symbol_attribute *attr, ext_attr_id_t ext_attr,
990 locus *where ATTRIBUTE_UNUSED)
991 {
992 attr->ext_attr |= 1 << ext_attr;
993 return true;
994 }
995
996
997 /* Called from decl.c (attr_decl1) to check attributes, when declared
998 separately. */
999
1000 bool
gfc_add_attribute(symbol_attribute * attr,locus * where)1001 gfc_add_attribute (symbol_attribute *attr, locus *where)
1002 {
1003 if (check_used (attr, NULL, where))
1004 return false;
1005
1006 return gfc_check_conflict (attr, NULL, where);
1007 }
1008
1009
1010 bool
gfc_add_allocatable(symbol_attribute * attr,locus * where)1011 gfc_add_allocatable (symbol_attribute *attr, locus *where)
1012 {
1013
1014 if (check_used (attr, NULL, where))
1015 return false;
1016
1017 if (attr->allocatable && ! gfc_submodule_procedure(attr))
1018 {
1019 duplicate_attr ("ALLOCATABLE", where);
1020 return false;
1021 }
1022
1023 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
1024 && !gfc_find_state (COMP_INTERFACE))
1025 {
1026 gfc_error ("ALLOCATABLE specified outside of INTERFACE body at %L",
1027 where);
1028 return false;
1029 }
1030
1031 attr->allocatable = 1;
1032 return gfc_check_conflict (attr, NULL, where);
1033 }
1034
1035
1036 bool
gfc_add_automatic(symbol_attribute * attr,const char * name,locus * where)1037 gfc_add_automatic (symbol_attribute *attr, const char *name, locus *where)
1038 {
1039 if (check_used (attr, name, where))
1040 return false;
1041
1042 if (attr->automatic && !gfc_notify_std (GFC_STD_LEGACY,
1043 "Duplicate AUTOMATIC attribute specified at %L", where))
1044 return false;
1045
1046 attr->automatic = 1;
1047 return gfc_check_conflict (attr, name, where);
1048 }
1049
1050
1051 bool
gfc_add_codimension(symbol_attribute * attr,const char * name,locus * where)1052 gfc_add_codimension (symbol_attribute *attr, const char *name, locus *where)
1053 {
1054
1055 if (check_used (attr, name, where))
1056 return false;
1057
1058 if (attr->codimension)
1059 {
1060 duplicate_attr ("CODIMENSION", where);
1061 return false;
1062 }
1063
1064 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
1065 && !gfc_find_state (COMP_INTERFACE))
1066 {
1067 gfc_error ("CODIMENSION specified for %qs outside its INTERFACE body "
1068 "at %L", name, where);
1069 return false;
1070 }
1071
1072 attr->codimension = 1;
1073 return gfc_check_conflict (attr, name, where);
1074 }
1075
1076
1077 bool
gfc_add_dimension(symbol_attribute * attr,const char * name,locus * where)1078 gfc_add_dimension (symbol_attribute *attr, const char *name, locus *where)
1079 {
1080
1081 if (check_used (attr, name, where))
1082 return false;
1083
1084 if (attr->dimension && ! gfc_submodule_procedure(attr))
1085 {
1086 duplicate_attr ("DIMENSION", where);
1087 return false;
1088 }
1089
1090 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
1091 && !gfc_find_state (COMP_INTERFACE))
1092 {
1093 gfc_error ("DIMENSION specified for %qs outside its INTERFACE body "
1094 "at %L", name, where);
1095 return false;
1096 }
1097
1098 attr->dimension = 1;
1099 return gfc_check_conflict (attr, name, where);
1100 }
1101
1102
1103 bool
gfc_add_contiguous(symbol_attribute * attr,const char * name,locus * where)1104 gfc_add_contiguous (symbol_attribute *attr, const char *name, locus *where)
1105 {
1106
1107 if (check_used (attr, name, where))
1108 return false;
1109
1110 attr->contiguous = 1;
1111 return gfc_check_conflict (attr, name, where);
1112 }
1113
1114
1115 bool
gfc_add_external(symbol_attribute * attr,locus * where)1116 gfc_add_external (symbol_attribute *attr, locus *where)
1117 {
1118
1119 if (check_used (attr, NULL, where))
1120 return false;
1121
1122 if (attr->external)
1123 {
1124 duplicate_attr ("EXTERNAL", where);
1125 return false;
1126 }
1127
1128 if (attr->pointer && attr->if_source != IFSRC_IFBODY)
1129 {
1130 attr->pointer = 0;
1131 attr->proc_pointer = 1;
1132 }
1133
1134 attr->external = 1;
1135
1136 return gfc_check_conflict (attr, NULL, where);
1137 }
1138
1139
1140 bool
gfc_add_intrinsic(symbol_attribute * attr,locus * where)1141 gfc_add_intrinsic (symbol_attribute *attr, locus *where)
1142 {
1143
1144 if (check_used (attr, NULL, where))
1145 return false;
1146
1147 if (attr->intrinsic)
1148 {
1149 duplicate_attr ("INTRINSIC", where);
1150 return false;
1151 }
1152
1153 attr->intrinsic = 1;
1154
1155 return gfc_check_conflict (attr, NULL, where);
1156 }
1157
1158
1159 bool
gfc_add_optional(symbol_attribute * attr,locus * where)1160 gfc_add_optional (symbol_attribute *attr, locus *where)
1161 {
1162
1163 if (check_used (attr, NULL, where))
1164 return false;
1165
1166 if (attr->optional)
1167 {
1168 duplicate_attr ("OPTIONAL", where);
1169 return false;
1170 }
1171
1172 attr->optional = 1;
1173 return gfc_check_conflict (attr, NULL, where);
1174 }
1175
1176 bool
gfc_add_kind(symbol_attribute * attr,locus * where)1177 gfc_add_kind (symbol_attribute *attr, locus *where)
1178 {
1179 if (attr->pdt_kind)
1180 {
1181 duplicate_attr ("KIND", where);
1182 return false;
1183 }
1184
1185 attr->pdt_kind = 1;
1186 return gfc_check_conflict (attr, NULL, where);
1187 }
1188
1189 bool
gfc_add_len(symbol_attribute * attr,locus * where)1190 gfc_add_len (symbol_attribute *attr, locus *where)
1191 {
1192 if (attr->pdt_len)
1193 {
1194 duplicate_attr ("LEN", where);
1195 return false;
1196 }
1197
1198 attr->pdt_len = 1;
1199 return gfc_check_conflict (attr, NULL, where);
1200 }
1201
1202
1203 bool
gfc_add_pointer(symbol_attribute * attr,locus * where)1204 gfc_add_pointer (symbol_attribute *attr, locus *where)
1205 {
1206
1207 if (check_used (attr, NULL, where))
1208 return false;
1209
1210 if (attr->pointer && !(attr->if_source == IFSRC_IFBODY
1211 && !gfc_find_state (COMP_INTERFACE))
1212 && ! gfc_submodule_procedure(attr))
1213 {
1214 duplicate_attr ("POINTER", where);
1215 return false;
1216 }
1217
1218 if (attr->procedure || (attr->external && attr->if_source != IFSRC_IFBODY)
1219 || (attr->if_source == IFSRC_IFBODY
1220 && !gfc_find_state (COMP_INTERFACE)))
1221 attr->proc_pointer = 1;
1222 else
1223 attr->pointer = 1;
1224
1225 return gfc_check_conflict (attr, NULL, where);
1226 }
1227
1228
1229 bool
gfc_add_cray_pointer(symbol_attribute * attr,locus * where)1230 gfc_add_cray_pointer (symbol_attribute *attr, locus *where)
1231 {
1232
1233 if (check_used (attr, NULL, where))
1234 return false;
1235
1236 attr->cray_pointer = 1;
1237 return gfc_check_conflict (attr, NULL, where);
1238 }
1239
1240
1241 bool
gfc_add_cray_pointee(symbol_attribute * attr,locus * where)1242 gfc_add_cray_pointee (symbol_attribute *attr, locus *where)
1243 {
1244
1245 if (check_used (attr, NULL, where))
1246 return false;
1247
1248 if (attr->cray_pointee)
1249 {
1250 gfc_error ("Cray Pointee at %L appears in multiple pointer()"
1251 " statements", where);
1252 return false;
1253 }
1254
1255 attr->cray_pointee = 1;
1256 return gfc_check_conflict (attr, NULL, where);
1257 }
1258
1259
1260 bool
gfc_add_protected(symbol_attribute * attr,const char * name,locus * where)1261 gfc_add_protected (symbol_attribute *attr, const char *name, locus *where)
1262 {
1263 if (check_used (attr, name, where))
1264 return false;
1265
1266 if (attr->is_protected)
1267 {
1268 if (!gfc_notify_std (GFC_STD_LEGACY,
1269 "Duplicate PROTECTED attribute specified at %L",
1270 where))
1271 return false;
1272 }
1273
1274 attr->is_protected = 1;
1275 return gfc_check_conflict (attr, name, where);
1276 }
1277
1278
1279 bool
gfc_add_result(symbol_attribute * attr,const char * name,locus * where)1280 gfc_add_result (symbol_attribute *attr, const char *name, locus *where)
1281 {
1282
1283 if (check_used (attr, name, where))
1284 return false;
1285
1286 attr->result = 1;
1287 return gfc_check_conflict (attr, name, where);
1288 }
1289
1290
1291 bool
gfc_add_save(symbol_attribute * attr,save_state s,const char * name,locus * where)1292 gfc_add_save (symbol_attribute *attr, save_state s, const char *name,
1293 locus *where)
1294 {
1295
1296 if (check_used (attr, name, where))
1297 return false;
1298
1299 if (s == SAVE_EXPLICIT && gfc_pure (NULL))
1300 {
1301 gfc_error
1302 ("SAVE attribute at %L cannot be specified in a PURE procedure",
1303 where);
1304 return false;
1305 }
1306
1307 if (s == SAVE_EXPLICIT)
1308 gfc_unset_implicit_pure (NULL);
1309
1310 if (s == SAVE_EXPLICIT && attr->save == SAVE_EXPLICIT
1311 && (flag_automatic || pedantic))
1312 {
1313 if (!gfc_notify_std (GFC_STD_LEGACY,
1314 "Duplicate SAVE attribute specified at %L",
1315 where))
1316 return false;
1317 }
1318
1319 attr->save = s;
1320 return gfc_check_conflict (attr, name, where);
1321 }
1322
1323
1324 bool
gfc_add_value(symbol_attribute * attr,const char * name,locus * where)1325 gfc_add_value (symbol_attribute *attr, const char *name, locus *where)
1326 {
1327
1328 if (check_used (attr, name, where))
1329 return false;
1330
1331 if (attr->value)
1332 {
1333 if (!gfc_notify_std (GFC_STD_LEGACY,
1334 "Duplicate VALUE attribute specified at %L",
1335 where))
1336 return false;
1337 }
1338
1339 attr->value = 1;
1340 return gfc_check_conflict (attr, name, where);
1341 }
1342
1343
1344 bool
gfc_add_volatile(symbol_attribute * attr,const char * name,locus * where)1345 gfc_add_volatile (symbol_attribute *attr, const char *name, locus *where)
1346 {
1347 /* No check_used needed as 11.2.1 of the F2003 standard allows
1348 that the local identifier made accessible by a use statement can be
1349 given a VOLATILE attribute - unless it is a coarray (F2008, C560). */
1350
1351 if (attr->volatile_ && attr->volatile_ns == gfc_current_ns)
1352 if (!gfc_notify_std (GFC_STD_LEGACY,
1353 "Duplicate VOLATILE attribute specified at %L",
1354 where))
1355 return false;
1356
1357 /* F2008: C1282 A designator of a variable with the VOLATILE attribute
1358 shall not appear in a pure subprogram.
1359
1360 F2018: C1588 A local variable of a pure subprogram, or of a BLOCK
1361 construct within a pure subprogram, shall not have the SAVE or
1362 VOLATILE attribute. */
1363 if (gfc_pure (NULL))
1364 {
1365 gfc_error ("VOLATILE attribute at %L cannot be specified in a "
1366 "PURE procedure", where);
1367 return false;
1368 }
1369
1370
1371 attr->volatile_ = 1;
1372 attr->volatile_ns = gfc_current_ns;
1373 return gfc_check_conflict (attr, name, where);
1374 }
1375
1376
1377 bool
gfc_add_asynchronous(symbol_attribute * attr,const char * name,locus * where)1378 gfc_add_asynchronous (symbol_attribute *attr, const char *name, locus *where)
1379 {
1380 /* No check_used needed as 11.2.1 of the F2003 standard allows
1381 that the local identifier made accessible by a use statement can be
1382 given a ASYNCHRONOUS attribute. */
1383
1384 if (attr->asynchronous && attr->asynchronous_ns == gfc_current_ns)
1385 if (!gfc_notify_std (GFC_STD_LEGACY,
1386 "Duplicate ASYNCHRONOUS attribute specified at %L",
1387 where))
1388 return false;
1389
1390 attr->asynchronous = 1;
1391 attr->asynchronous_ns = gfc_current_ns;
1392 return gfc_check_conflict (attr, name, where);
1393 }
1394
1395
1396 bool
gfc_add_threadprivate(symbol_attribute * attr,const char * name,locus * where)1397 gfc_add_threadprivate (symbol_attribute *attr, const char *name, locus *where)
1398 {
1399
1400 if (check_used (attr, name, where))
1401 return false;
1402
1403 if (attr->threadprivate)
1404 {
1405 duplicate_attr ("THREADPRIVATE", where);
1406 return false;
1407 }
1408
1409 attr->threadprivate = 1;
1410 return gfc_check_conflict (attr, name, where);
1411 }
1412
1413
1414 bool
gfc_add_omp_declare_target(symbol_attribute * attr,const char * name,locus * where)1415 gfc_add_omp_declare_target (symbol_attribute *attr, const char *name,
1416 locus *where)
1417 {
1418
1419 if (check_used (attr, name, where))
1420 return false;
1421
1422 if (attr->omp_declare_target)
1423 return true;
1424
1425 attr->omp_declare_target = 1;
1426 return gfc_check_conflict (attr, name, where);
1427 }
1428
1429
1430 bool
gfc_add_omp_declare_target_link(symbol_attribute * attr,const char * name,locus * where)1431 gfc_add_omp_declare_target_link (symbol_attribute *attr, const char *name,
1432 locus *where)
1433 {
1434
1435 if (check_used (attr, name, where))
1436 return false;
1437
1438 if (attr->omp_declare_target_link)
1439 return true;
1440
1441 attr->omp_declare_target_link = 1;
1442 return gfc_check_conflict (attr, name, where);
1443 }
1444
1445
1446 bool
gfc_add_oacc_declare_create(symbol_attribute * attr,const char * name,locus * where)1447 gfc_add_oacc_declare_create (symbol_attribute *attr, const char *name,
1448 locus *where)
1449 {
1450 if (check_used (attr, name, where))
1451 return false;
1452
1453 if (attr->oacc_declare_create)
1454 return true;
1455
1456 attr->oacc_declare_create = 1;
1457 return gfc_check_conflict (attr, name, where);
1458 }
1459
1460
1461 bool
gfc_add_oacc_declare_copyin(symbol_attribute * attr,const char * name,locus * where)1462 gfc_add_oacc_declare_copyin (symbol_attribute *attr, const char *name,
1463 locus *where)
1464 {
1465 if (check_used (attr, name, where))
1466 return false;
1467
1468 if (attr->oacc_declare_copyin)
1469 return true;
1470
1471 attr->oacc_declare_copyin = 1;
1472 return gfc_check_conflict (attr, name, where);
1473 }
1474
1475
1476 bool
gfc_add_oacc_declare_deviceptr(symbol_attribute * attr,const char * name,locus * where)1477 gfc_add_oacc_declare_deviceptr (symbol_attribute *attr, const char *name,
1478 locus *where)
1479 {
1480 if (check_used (attr, name, where))
1481 return false;
1482
1483 if (attr->oacc_declare_deviceptr)
1484 return true;
1485
1486 attr->oacc_declare_deviceptr = 1;
1487 return gfc_check_conflict (attr, name, where);
1488 }
1489
1490
1491 bool
gfc_add_oacc_declare_device_resident(symbol_attribute * attr,const char * name,locus * where)1492 gfc_add_oacc_declare_device_resident (symbol_attribute *attr, const char *name,
1493 locus *where)
1494 {
1495 if (check_used (attr, name, where))
1496 return false;
1497
1498 if (attr->oacc_declare_device_resident)
1499 return true;
1500
1501 attr->oacc_declare_device_resident = 1;
1502 return gfc_check_conflict (attr, name, where);
1503 }
1504
1505
1506 bool
gfc_add_target(symbol_attribute * attr,locus * where)1507 gfc_add_target (symbol_attribute *attr, locus *where)
1508 {
1509
1510 if (check_used (attr, NULL, where))
1511 return false;
1512
1513 if (attr->target)
1514 {
1515 duplicate_attr ("TARGET", where);
1516 return false;
1517 }
1518
1519 attr->target = 1;
1520 return gfc_check_conflict (attr, NULL, where);
1521 }
1522
1523
1524 bool
gfc_add_dummy(symbol_attribute * attr,const char * name,locus * where)1525 gfc_add_dummy (symbol_attribute *attr, const char *name, locus *where)
1526 {
1527
1528 if (check_used (attr, name, where))
1529 return false;
1530
1531 /* Duplicate dummy arguments are allowed due to ENTRY statements. */
1532 attr->dummy = 1;
1533 return gfc_check_conflict (attr, name, where);
1534 }
1535
1536
1537 bool
gfc_add_in_common(symbol_attribute * attr,const char * name,locus * where)1538 gfc_add_in_common (symbol_attribute *attr, const char *name, locus *where)
1539 {
1540
1541 if (check_used (attr, name, where))
1542 return false;
1543
1544 /* Duplicate attribute already checked for. */
1545 attr->in_common = 1;
1546 return gfc_check_conflict (attr, name, where);
1547 }
1548
1549
1550 bool
gfc_add_in_equivalence(symbol_attribute * attr,const char * name,locus * where)1551 gfc_add_in_equivalence (symbol_attribute *attr, const char *name, locus *where)
1552 {
1553
1554 /* Duplicate attribute already checked for. */
1555 attr->in_equivalence = 1;
1556 if (!gfc_check_conflict (attr, name, where))
1557 return false;
1558
1559 if (attr->flavor == FL_VARIABLE)
1560 return true;
1561
1562 return gfc_add_flavor (attr, FL_VARIABLE, name, where);
1563 }
1564
1565
1566 bool
gfc_add_data(symbol_attribute * attr,const char * name,locus * where)1567 gfc_add_data (symbol_attribute *attr, const char *name, locus *where)
1568 {
1569
1570 if (check_used (attr, name, where))
1571 return false;
1572
1573 attr->data = 1;
1574 return gfc_check_conflict (attr, name, where);
1575 }
1576
1577
1578 bool
gfc_add_in_namelist(symbol_attribute * attr,const char * name,locus * where)1579 gfc_add_in_namelist (symbol_attribute *attr, const char *name, locus *where)
1580 {
1581
1582 attr->in_namelist = 1;
1583 return gfc_check_conflict (attr, name, where);
1584 }
1585
1586
1587 bool
gfc_add_sequence(symbol_attribute * attr,const char * name,locus * where)1588 gfc_add_sequence (symbol_attribute *attr, const char *name, locus *where)
1589 {
1590
1591 if (check_used (attr, name, where))
1592 return false;
1593
1594 attr->sequence = 1;
1595 return gfc_check_conflict (attr, name, where);
1596 }
1597
1598
1599 bool
gfc_add_elemental(symbol_attribute * attr,locus * where)1600 gfc_add_elemental (symbol_attribute *attr, locus *where)
1601 {
1602
1603 if (check_used (attr, NULL, where))
1604 return false;
1605
1606 if (attr->elemental)
1607 {
1608 duplicate_attr ("ELEMENTAL", where);
1609 return false;
1610 }
1611
1612 attr->elemental = 1;
1613 return gfc_check_conflict (attr, NULL, where);
1614 }
1615
1616
1617 bool
gfc_add_pure(symbol_attribute * attr,locus * where)1618 gfc_add_pure (symbol_attribute *attr, locus *where)
1619 {
1620
1621 if (check_used (attr, NULL, where))
1622 return false;
1623
1624 if (attr->pure)
1625 {
1626 duplicate_attr ("PURE", where);
1627 return false;
1628 }
1629
1630 attr->pure = 1;
1631 return gfc_check_conflict (attr, NULL, where);
1632 }
1633
1634
1635 bool
gfc_add_recursive(symbol_attribute * attr,locus * where)1636 gfc_add_recursive (symbol_attribute *attr, locus *where)
1637 {
1638
1639 if (check_used (attr, NULL, where))
1640 return false;
1641
1642 if (attr->recursive)
1643 {
1644 duplicate_attr ("RECURSIVE", where);
1645 return false;
1646 }
1647
1648 attr->recursive = 1;
1649 return gfc_check_conflict (attr, NULL, where);
1650 }
1651
1652
1653 bool
gfc_add_entry(symbol_attribute * attr,const char * name,locus * where)1654 gfc_add_entry (symbol_attribute *attr, const char *name, locus *where)
1655 {
1656
1657 if (check_used (attr, name, where))
1658 return false;
1659
1660 if (attr->entry)
1661 {
1662 duplicate_attr ("ENTRY", where);
1663 return false;
1664 }
1665
1666 attr->entry = 1;
1667 return gfc_check_conflict (attr, name, where);
1668 }
1669
1670
1671 bool
gfc_add_function(symbol_attribute * attr,const char * name,locus * where)1672 gfc_add_function (symbol_attribute *attr, const char *name, locus *where)
1673 {
1674
1675 if (attr->flavor != FL_PROCEDURE
1676 && !gfc_add_flavor (attr, FL_PROCEDURE, name, where))
1677 return false;
1678
1679 attr->function = 1;
1680 return gfc_check_conflict (attr, name, where);
1681 }
1682
1683
1684 bool
gfc_add_subroutine(symbol_attribute * attr,const char * name,locus * where)1685 gfc_add_subroutine (symbol_attribute *attr, const char *name, locus *where)
1686 {
1687
1688 if (attr->flavor != FL_PROCEDURE
1689 && !gfc_add_flavor (attr, FL_PROCEDURE, name, where))
1690 return false;
1691
1692 attr->subroutine = 1;
1693
1694 /* If we are looking at a BLOCK DATA statement and we encounter a
1695 name with a leading underscore (which must be
1696 compiler-generated), do not check. See PR 84394. */
1697
1698 if (name && *name != '_' && gfc_current_state () != COMP_BLOCK_DATA)
1699 return gfc_check_conflict (attr, name, where);
1700 else
1701 return true;
1702 }
1703
1704
1705 bool
gfc_add_generic(symbol_attribute * attr,const char * name,locus * where)1706 gfc_add_generic (symbol_attribute *attr, const char *name, locus *where)
1707 {
1708
1709 if (attr->flavor != FL_PROCEDURE
1710 && !gfc_add_flavor (attr, FL_PROCEDURE, name, where))
1711 return false;
1712
1713 attr->generic = 1;
1714 return gfc_check_conflict (attr, name, where);
1715 }
1716
1717
1718 bool
gfc_add_proc(symbol_attribute * attr,const char * name,locus * where)1719 gfc_add_proc (symbol_attribute *attr, const char *name, locus *where)
1720 {
1721
1722 if (check_used (attr, NULL, where))
1723 return false;
1724
1725 if (attr->flavor != FL_PROCEDURE
1726 && !gfc_add_flavor (attr, FL_PROCEDURE, name, where))
1727 return false;
1728
1729 if (attr->procedure)
1730 {
1731 duplicate_attr ("PROCEDURE", where);
1732 return false;
1733 }
1734
1735 attr->procedure = 1;
1736
1737 return gfc_check_conflict (attr, NULL, where);
1738 }
1739
1740
1741 bool
gfc_add_abstract(symbol_attribute * attr,locus * where)1742 gfc_add_abstract (symbol_attribute* attr, locus* where)
1743 {
1744 if (attr->abstract)
1745 {
1746 duplicate_attr ("ABSTRACT", where);
1747 return false;
1748 }
1749
1750 attr->abstract = 1;
1751
1752 return gfc_check_conflict (attr, NULL, where);
1753 }
1754
1755
1756 /* Flavors are special because some flavors are not what Fortran
1757 considers attributes and can be reaffirmed multiple times. */
1758
1759 bool
gfc_add_flavor(symbol_attribute * attr,sym_flavor f,const char * name,locus * where)1760 gfc_add_flavor (symbol_attribute *attr, sym_flavor f, const char *name,
1761 locus *where)
1762 {
1763
1764 if ((f == FL_PROGRAM || f == FL_BLOCK_DATA || f == FL_MODULE
1765 || f == FL_PARAMETER || f == FL_LABEL || gfc_fl_struct(f)
1766 || f == FL_NAMELIST) && check_used (attr, name, where))
1767 return false;
1768
1769 if (attr->flavor == f && f == FL_VARIABLE)
1770 return true;
1771
1772 /* Copying a procedure dummy argument for a module procedure in a
1773 submodule results in the flavor being copied and would result in
1774 an error without this. */
1775 if (gfc_new_block && gfc_new_block->abr_modproc_decl
1776 && attr->flavor == f && f == FL_PROCEDURE)
1777 return true;
1778
1779 if (attr->flavor != FL_UNKNOWN)
1780 {
1781 if (where == NULL)
1782 where = &gfc_current_locus;
1783
1784 if (name)
1785 gfc_error ("%s attribute of %qs conflicts with %s attribute at %L",
1786 gfc_code2string (flavors, attr->flavor), name,
1787 gfc_code2string (flavors, f), where);
1788 else
1789 gfc_error ("%s attribute conflicts with %s attribute at %L",
1790 gfc_code2string (flavors, attr->flavor),
1791 gfc_code2string (flavors, f), where);
1792
1793 return false;
1794 }
1795
1796 attr->flavor = f;
1797
1798 return gfc_check_conflict (attr, name, where);
1799 }
1800
1801
1802 bool
gfc_add_procedure(symbol_attribute * attr,procedure_type t,const char * name,locus * where)1803 gfc_add_procedure (symbol_attribute *attr, procedure_type t,
1804 const char *name, locus *where)
1805 {
1806
1807 if (check_used (attr, name, where))
1808 return false;
1809
1810 if (attr->flavor != FL_PROCEDURE
1811 && !gfc_add_flavor (attr, FL_PROCEDURE, name, where))
1812 return false;
1813
1814 if (where == NULL)
1815 where = &gfc_current_locus;
1816
1817 if (attr->proc != PROC_UNKNOWN && !attr->module_procedure
1818 && attr->access == ACCESS_UNKNOWN)
1819 {
1820 if (attr->proc == PROC_ST_FUNCTION && t == PROC_INTERNAL
1821 && !gfc_notification_std (GFC_STD_F2008))
1822 gfc_error ("%s procedure at %L is already declared as %s "
1823 "procedure. \nF2008: A pointer function assignment "
1824 "is ambiguous if it is the first executable statement "
1825 "after the specification block. Please add any other "
1826 "kind of executable statement before it. FIXME",
1827 gfc_code2string (procedures, t), where,
1828 gfc_code2string (procedures, attr->proc));
1829 else
1830 gfc_error ("%s procedure at %L is already declared as %s "
1831 "procedure", gfc_code2string (procedures, t), where,
1832 gfc_code2string (procedures, attr->proc));
1833
1834 return false;
1835 }
1836
1837 attr->proc = t;
1838
1839 /* Statement functions are always scalar and functions. */
1840 if (t == PROC_ST_FUNCTION
1841 && ((!attr->function && !gfc_add_function (attr, name, where))
1842 || attr->dimension))
1843 return false;
1844
1845 return gfc_check_conflict (attr, name, where);
1846 }
1847
1848
1849 bool
gfc_add_intent(symbol_attribute * attr,sym_intent intent,locus * where)1850 gfc_add_intent (symbol_attribute *attr, sym_intent intent, locus *where)
1851 {
1852
1853 if (check_used (attr, NULL, where))
1854 return false;
1855
1856 if (attr->intent == INTENT_UNKNOWN)
1857 {
1858 attr->intent = intent;
1859 return gfc_check_conflict (attr, NULL, where);
1860 }
1861
1862 if (where == NULL)
1863 where = &gfc_current_locus;
1864
1865 gfc_error ("INTENT (%s) conflicts with INTENT(%s) at %L",
1866 gfc_intent_string (attr->intent),
1867 gfc_intent_string (intent), where);
1868
1869 return false;
1870 }
1871
1872
1873 /* No checks for use-association in public and private statements. */
1874
1875 bool
gfc_add_access(symbol_attribute * attr,gfc_access access,const char * name,locus * where)1876 gfc_add_access (symbol_attribute *attr, gfc_access access,
1877 const char *name, locus *where)
1878 {
1879
1880 if (attr->access == ACCESS_UNKNOWN
1881 || (attr->use_assoc && attr->access != ACCESS_PRIVATE))
1882 {
1883 attr->access = access;
1884 return gfc_check_conflict (attr, name, where);
1885 }
1886
1887 if (where == NULL)
1888 where = &gfc_current_locus;
1889 gfc_error ("ACCESS specification at %L was already specified", where);
1890
1891 return false;
1892 }
1893
1894
1895 /* Set the is_bind_c field for the given symbol_attribute. */
1896
1897 bool
gfc_add_is_bind_c(symbol_attribute * attr,const char * name,locus * where,int is_proc_lang_bind_spec)1898 gfc_add_is_bind_c (symbol_attribute *attr, const char *name, locus *where,
1899 int is_proc_lang_bind_spec)
1900 {
1901
1902 if (is_proc_lang_bind_spec == 0 && attr->flavor == FL_PROCEDURE)
1903 gfc_error_now ("BIND(C) attribute at %L can only be used for "
1904 "variables or common blocks", where);
1905 else if (attr->is_bind_c)
1906 gfc_error_now ("Duplicate BIND attribute specified at %L", where);
1907 else
1908 attr->is_bind_c = 1;
1909
1910 if (where == NULL)
1911 where = &gfc_current_locus;
1912
1913 if (!gfc_notify_std (GFC_STD_F2003, "BIND(C) at %L", where))
1914 return false;
1915
1916 return gfc_check_conflict (attr, name, where);
1917 }
1918
1919
1920 /* Set the extension field for the given symbol_attribute. */
1921
1922 bool
gfc_add_extension(symbol_attribute * attr,locus * where)1923 gfc_add_extension (symbol_attribute *attr, locus *where)
1924 {
1925 if (where == NULL)
1926 where = &gfc_current_locus;
1927
1928 if (attr->extension)
1929 gfc_error_now ("Duplicate EXTENDS attribute specified at %L", where);
1930 else
1931 attr->extension = 1;
1932
1933 if (!gfc_notify_std (GFC_STD_F2003, "EXTENDS at %L", where))
1934 return false;
1935
1936 return true;
1937 }
1938
1939
1940 bool
gfc_add_explicit_interface(gfc_symbol * sym,ifsrc source,gfc_formal_arglist * formal,locus * where)1941 gfc_add_explicit_interface (gfc_symbol *sym, ifsrc source,
1942 gfc_formal_arglist * formal, locus *where)
1943 {
1944 if (check_used (&sym->attr, sym->name, where))
1945 return false;
1946
1947 /* Skip the following checks in the case of a module_procedures in a
1948 submodule since they will manifestly fail. */
1949 if (sym->attr.module_procedure == 1
1950 && source == IFSRC_DECL)
1951 goto finish;
1952
1953 if (where == NULL)
1954 where = &gfc_current_locus;
1955
1956 if (sym->attr.if_source != IFSRC_UNKNOWN
1957 && sym->attr.if_source != IFSRC_DECL)
1958 {
1959 gfc_error ("Symbol %qs at %L already has an explicit interface",
1960 sym->name, where);
1961 return false;
1962 }
1963
1964 if (source == IFSRC_IFBODY && (sym->attr.dimension || sym->attr.allocatable))
1965 {
1966 gfc_error ("%qs at %L has attributes specified outside its INTERFACE "
1967 "body", sym->name, where);
1968 return false;
1969 }
1970
1971 finish:
1972 sym->formal = formal;
1973 sym->attr.if_source = source;
1974
1975 return true;
1976 }
1977
1978
1979 /* Add a type to a symbol. */
1980
1981 bool
gfc_add_type(gfc_symbol * sym,gfc_typespec * ts,locus * where)1982 gfc_add_type (gfc_symbol *sym, gfc_typespec *ts, locus *where)
1983 {
1984 sym_flavor flavor;
1985 bt type;
1986
1987 if (where == NULL)
1988 where = &gfc_current_locus;
1989
1990 if (sym->result)
1991 type = sym->result->ts.type;
1992 else
1993 type = sym->ts.type;
1994
1995 if (sym->attr.result && type == BT_UNKNOWN && sym->ns->proc_name)
1996 type = sym->ns->proc_name->ts.type;
1997
1998 if (type != BT_UNKNOWN && !(sym->attr.function && sym->attr.implicit_type)
1999 && !(gfc_state_stack->previous && gfc_state_stack->previous->previous
2000 && gfc_state_stack->previous->previous->state == COMP_SUBMODULE)
2001 && !sym->attr.module_procedure)
2002 {
2003 if (sym->attr.use_assoc)
2004 gfc_error ("Symbol %qs at %L conflicts with symbol from module %qs, "
2005 "use-associated at %L", sym->name, where, sym->module,
2006 &sym->declared_at);
2007 else if (sym->attr.function && sym->attr.result)
2008 gfc_error ("Symbol %qs at %L already has basic type of %s",
2009 sym->ns->proc_name->name, where, gfc_basic_typename (type));
2010 else
2011 gfc_error ("Symbol %qs at %L already has basic type of %s", sym->name,
2012 where, gfc_basic_typename (type));
2013 return false;
2014 }
2015
2016 if (sym->attr.procedure && sym->ts.interface)
2017 {
2018 gfc_error ("Procedure %qs at %L may not have basic type of %s",
2019 sym->name, where, gfc_basic_typename (ts->type));
2020 return false;
2021 }
2022
2023 flavor = sym->attr.flavor;
2024
2025 if (flavor == FL_PROGRAM || flavor == FL_BLOCK_DATA || flavor == FL_MODULE
2026 || flavor == FL_LABEL
2027 || (flavor == FL_PROCEDURE && sym->attr.subroutine)
2028 || flavor == FL_DERIVED || flavor == FL_NAMELIST)
2029 {
2030 gfc_error ("Symbol %qs at %L cannot have a type",
2031 sym->ns->proc_name ? sym->ns->proc_name->name : sym->name,
2032 where);
2033 return false;
2034 }
2035
2036 sym->ts = *ts;
2037 return true;
2038 }
2039
2040
2041 /* Clears all attributes. */
2042
2043 void
gfc_clear_attr(symbol_attribute * attr)2044 gfc_clear_attr (symbol_attribute *attr)
2045 {
2046 memset (attr, 0, sizeof (symbol_attribute));
2047 }
2048
2049
2050 /* Check for missing attributes in the new symbol. Currently does
2051 nothing, but it's not clear that it is unnecessary yet. */
2052
2053 bool
gfc_missing_attr(symbol_attribute * attr ATTRIBUTE_UNUSED,locus * where ATTRIBUTE_UNUSED)2054 gfc_missing_attr (symbol_attribute *attr ATTRIBUTE_UNUSED,
2055 locus *where ATTRIBUTE_UNUSED)
2056 {
2057
2058 return true;
2059 }
2060
2061
2062 /* Copy an attribute to a symbol attribute, bit by bit. Some
2063 attributes have a lot of side-effects but cannot be present given
2064 where we are called from, so we ignore some bits. */
2065
2066 bool
gfc_copy_attr(symbol_attribute * dest,symbol_attribute * src,locus * where)2067 gfc_copy_attr (symbol_attribute *dest, symbol_attribute *src, locus *where)
2068 {
2069 int is_proc_lang_bind_spec;
2070
2071 /* In line with the other attributes, we only add bits but do not remove
2072 them; cf. also PR 41034. */
2073 dest->ext_attr |= src->ext_attr;
2074
2075 if (src->allocatable && !gfc_add_allocatable (dest, where))
2076 goto fail;
2077
2078 if (src->automatic && !gfc_add_automatic (dest, NULL, where))
2079 goto fail;
2080 if (src->dimension && !gfc_add_dimension (dest, NULL, where))
2081 goto fail;
2082 if (src->codimension && !gfc_add_codimension (dest, NULL, where))
2083 goto fail;
2084 if (src->contiguous && !gfc_add_contiguous (dest, NULL, where))
2085 goto fail;
2086 if (src->optional && !gfc_add_optional (dest, where))
2087 goto fail;
2088 if (src->pointer && !gfc_add_pointer (dest, where))
2089 goto fail;
2090 if (src->is_protected && !gfc_add_protected (dest, NULL, where))
2091 goto fail;
2092 if (src->save && !gfc_add_save (dest, src->save, NULL, where))
2093 goto fail;
2094 if (src->value && !gfc_add_value (dest, NULL, where))
2095 goto fail;
2096 if (src->volatile_ && !gfc_add_volatile (dest, NULL, where))
2097 goto fail;
2098 if (src->asynchronous && !gfc_add_asynchronous (dest, NULL, where))
2099 goto fail;
2100 if (src->threadprivate
2101 && !gfc_add_threadprivate (dest, NULL, where))
2102 goto fail;
2103 if (src->omp_declare_target
2104 && !gfc_add_omp_declare_target (dest, NULL, where))
2105 goto fail;
2106 if (src->omp_declare_target_link
2107 && !gfc_add_omp_declare_target_link (dest, NULL, where))
2108 goto fail;
2109 if (src->oacc_declare_create
2110 && !gfc_add_oacc_declare_create (dest, NULL, where))
2111 goto fail;
2112 if (src->oacc_declare_copyin
2113 && !gfc_add_oacc_declare_copyin (dest, NULL, where))
2114 goto fail;
2115 if (src->oacc_declare_deviceptr
2116 && !gfc_add_oacc_declare_deviceptr (dest, NULL, where))
2117 goto fail;
2118 if (src->oacc_declare_device_resident
2119 && !gfc_add_oacc_declare_device_resident (dest, NULL, where))
2120 goto fail;
2121 if (src->target && !gfc_add_target (dest, where))
2122 goto fail;
2123 if (src->dummy && !gfc_add_dummy (dest, NULL, where))
2124 goto fail;
2125 if (src->result && !gfc_add_result (dest, NULL, where))
2126 goto fail;
2127 if (src->entry)
2128 dest->entry = 1;
2129
2130 if (src->in_namelist && !gfc_add_in_namelist (dest, NULL, where))
2131 goto fail;
2132
2133 if (src->in_common && !gfc_add_in_common (dest, NULL, where))
2134 goto fail;
2135
2136 if (src->generic && !gfc_add_generic (dest, NULL, where))
2137 goto fail;
2138 if (src->function && !gfc_add_function (dest, NULL, where))
2139 goto fail;
2140 if (src->subroutine && !gfc_add_subroutine (dest, NULL, where))
2141 goto fail;
2142
2143 if (src->sequence && !gfc_add_sequence (dest, NULL, where))
2144 goto fail;
2145 if (src->elemental && !gfc_add_elemental (dest, where))
2146 goto fail;
2147 if (src->pure && !gfc_add_pure (dest, where))
2148 goto fail;
2149 if (src->recursive && !gfc_add_recursive (dest, where))
2150 goto fail;
2151
2152 if (src->flavor != FL_UNKNOWN
2153 && !gfc_add_flavor (dest, src->flavor, NULL, where))
2154 goto fail;
2155
2156 if (src->intent != INTENT_UNKNOWN
2157 && !gfc_add_intent (dest, src->intent, where))
2158 goto fail;
2159
2160 if (src->access != ACCESS_UNKNOWN
2161 && !gfc_add_access (dest, src->access, NULL, where))
2162 goto fail;
2163
2164 if (!gfc_missing_attr (dest, where))
2165 goto fail;
2166
2167 if (src->cray_pointer && !gfc_add_cray_pointer (dest, where))
2168 goto fail;
2169 if (src->cray_pointee && !gfc_add_cray_pointee (dest, where))
2170 goto fail;
2171
2172 is_proc_lang_bind_spec = (src->flavor == FL_PROCEDURE ? 1 : 0);
2173 if (src->is_bind_c
2174 && !gfc_add_is_bind_c (dest, NULL, where, is_proc_lang_bind_spec))
2175 return false;
2176
2177 if (src->is_c_interop)
2178 dest->is_c_interop = 1;
2179 if (src->is_iso_c)
2180 dest->is_iso_c = 1;
2181
2182 if (src->external && !gfc_add_external (dest, where))
2183 goto fail;
2184 if (src->intrinsic && !gfc_add_intrinsic (dest, where))
2185 goto fail;
2186 if (src->proc_pointer)
2187 dest->proc_pointer = 1;
2188
2189 return true;
2190
2191 fail:
2192 return false;
2193 }
2194
2195
2196 /* A function to generate a dummy argument symbol using that from the
2197 interface declaration. Can be used for the result symbol as well if
2198 the flag is set. */
2199
2200 int
gfc_copy_dummy_sym(gfc_symbol ** dsym,gfc_symbol * sym,int result)2201 gfc_copy_dummy_sym (gfc_symbol **dsym, gfc_symbol *sym, int result)
2202 {
2203 int rc;
2204
2205 rc = gfc_get_symbol (sym->name, NULL, dsym);
2206 if (rc)
2207 return rc;
2208
2209 if (!gfc_add_type (*dsym, &(sym->ts), &gfc_current_locus))
2210 return 1;
2211
2212 if (!gfc_copy_attr (&(*dsym)->attr, &(sym->attr),
2213 &gfc_current_locus))
2214 return 1;
2215
2216 if ((*dsym)->attr.dimension)
2217 (*dsym)->as = gfc_copy_array_spec (sym->as);
2218
2219 (*dsym)->attr.class_ok = sym->attr.class_ok;
2220
2221 if ((*dsym) != NULL && !result
2222 && (!gfc_add_dummy(&(*dsym)->attr, (*dsym)->name, NULL)
2223 || !gfc_missing_attr (&(*dsym)->attr, NULL)))
2224 return 1;
2225 else if ((*dsym) != NULL && result
2226 && (!gfc_add_result(&(*dsym)->attr, (*dsym)->name, NULL)
2227 || !gfc_missing_attr (&(*dsym)->attr, NULL)))
2228 return 1;
2229
2230 return 0;
2231 }
2232
2233
2234 /************** Component name management ************/
2235
2236 /* Component names of a derived type form their own little namespaces
2237 that are separate from all other spaces. The space is composed of
2238 a singly linked list of gfc_component structures whose head is
2239 located in the parent symbol. */
2240
2241
2242 /* Add a component name to a symbol. The call fails if the name is
2243 already present. On success, the component pointer is modified to
2244 point to the additional component structure. */
2245
2246 bool
gfc_add_component(gfc_symbol * sym,const char * name,gfc_component ** component)2247 gfc_add_component (gfc_symbol *sym, const char *name,
2248 gfc_component **component)
2249 {
2250 gfc_component *p, *tail;
2251
2252 /* Check for existing components with the same name, but not for union
2253 components or containers. Unions and maps are anonymous so they have
2254 unique internal names which will never conflict.
2255 Don't use gfc_find_component here because it calls gfc_use_derived,
2256 but the derived type may not be fully defined yet. */
2257 tail = NULL;
2258
2259 for (p = sym->components; p; p = p->next)
2260 {
2261 if (strcmp (p->name, name) == 0)
2262 {
2263 gfc_error ("Component %qs at %C already declared at %L",
2264 name, &p->loc);
2265 return false;
2266 }
2267
2268 tail = p;
2269 }
2270
2271 if (sym->attr.extension
2272 && gfc_find_component (sym->components->ts.u.derived,
2273 name, true, true, NULL))
2274 {
2275 gfc_error ("Component %qs at %C already in the parent type "
2276 "at %L", name, &sym->components->ts.u.derived->declared_at);
2277 return false;
2278 }
2279
2280 /* Allocate a new component. */
2281 p = gfc_get_component ();
2282
2283 if (tail == NULL)
2284 sym->components = p;
2285 else
2286 tail->next = p;
2287
2288 p->name = gfc_get_string ("%s", name);
2289 p->loc = gfc_current_locus;
2290 p->ts.type = BT_UNKNOWN;
2291
2292 *component = p;
2293 return true;
2294 }
2295
2296
2297 /* Recursive function to switch derived types of all symbol in a
2298 namespace. */
2299
2300 static void
switch_types(gfc_symtree * st,gfc_symbol * from,gfc_symbol * to)2301 switch_types (gfc_symtree *st, gfc_symbol *from, gfc_symbol *to)
2302 {
2303 gfc_symbol *sym;
2304
2305 if (st == NULL)
2306 return;
2307
2308 sym = st->n.sym;
2309 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived == from)
2310 sym->ts.u.derived = to;
2311
2312 switch_types (st->left, from, to);
2313 switch_types (st->right, from, to);
2314 }
2315
2316
2317 /* This subroutine is called when a derived type is used in order to
2318 make the final determination about which version to use. The
2319 standard requires that a type be defined before it is 'used', but
2320 such types can appear in IMPLICIT statements before the actual
2321 definition. 'Using' in this context means declaring a variable to
2322 be that type or using the type constructor.
2323
2324 If a type is used and the components haven't been defined, then we
2325 have to have a derived type in a parent unit. We find the node in
2326 the other namespace and point the symtree node in this namespace to
2327 that node. Further reference to this name point to the correct
2328 node. If we can't find the node in a parent namespace, then we have
2329 an error.
2330
2331 This subroutine takes a pointer to a symbol node and returns a
2332 pointer to the translated node or NULL for an error. Usually there
2333 is no translation and we return the node we were passed. */
2334
2335 gfc_symbol *
gfc_use_derived(gfc_symbol * sym)2336 gfc_use_derived (gfc_symbol *sym)
2337 {
2338 gfc_symbol *s;
2339 gfc_typespec *t;
2340 gfc_symtree *st;
2341 int i;
2342
2343 if (!sym)
2344 return NULL;
2345
2346 if (sym->attr.unlimited_polymorphic)
2347 return sym;
2348
2349 if (sym->attr.generic)
2350 sym = gfc_find_dt_in_generic (sym);
2351
2352 if (sym->components != NULL || sym->attr.zero_comp)
2353 return sym; /* Already defined. */
2354
2355 if (sym->ns->parent == NULL)
2356 goto bad;
2357
2358 if (gfc_find_symbol (sym->name, sym->ns->parent, 1, &s))
2359 {
2360 gfc_error ("Symbol %qs at %C is ambiguous", sym->name);
2361 return NULL;
2362 }
2363
2364 if (s == NULL || !gfc_fl_struct (s->attr.flavor))
2365 goto bad;
2366
2367 /* Get rid of symbol sym, translating all references to s. */
2368 for (i = 0; i < GFC_LETTERS; i++)
2369 {
2370 t = &sym->ns->default_type[i];
2371 if (t->u.derived == sym)
2372 t->u.derived = s;
2373 }
2374
2375 st = gfc_find_symtree (sym->ns->sym_root, sym->name);
2376 st->n.sym = s;
2377
2378 s->refs++;
2379
2380 /* Unlink from list of modified symbols. */
2381 gfc_commit_symbol (sym);
2382
2383 switch_types (sym->ns->sym_root, sym, s);
2384
2385 /* TODO: Also have to replace sym -> s in other lists like
2386 namelists, common lists and interface lists. */
2387 gfc_free_symbol (sym);
2388
2389 return s;
2390
2391 bad:
2392 gfc_error ("Derived type %qs at %C is being used before it is defined",
2393 sym->name);
2394 return NULL;
2395 }
2396
2397
2398 /* Find the component with the given name in the union type symbol.
2399 If ref is not NULL it will be set to the chain of components through which
2400 the component can actually be accessed. This is necessary for unions because
2401 intermediate structures may be maps, nested structures, or other unions,
2402 all of which may (or must) be 'anonymous' to user code. */
2403
2404 static gfc_component *
find_union_component(gfc_symbol * un,const char * name,bool noaccess,gfc_ref ** ref)2405 find_union_component (gfc_symbol *un, const char *name,
2406 bool noaccess, gfc_ref **ref)
2407 {
2408 gfc_component *m, *check;
2409 gfc_ref *sref, *tmp;
2410
2411 for (m = un->components; m; m = m->next)
2412 {
2413 check = gfc_find_component (m->ts.u.derived, name, noaccess, true, &tmp);
2414 if (check == NULL)
2415 continue;
2416
2417 /* Found component somewhere in m; chain the refs together. */
2418 if (ref)
2419 {
2420 /* Map ref. */
2421 sref = gfc_get_ref ();
2422 sref->type = REF_COMPONENT;
2423 sref->u.c.component = m;
2424 sref->u.c.sym = m->ts.u.derived;
2425 sref->next = tmp;
2426
2427 *ref = sref;
2428 }
2429 /* Other checks (such as access) were done in the recursive calls. */
2430 return check;
2431 }
2432 return NULL;
2433 }
2434
2435
2436 /* Recursively append candidate COMPONENT structures to CANDIDATES. Store
2437 the number of total candidates in CANDIDATES_LEN. */
2438
2439 static void
lookup_component_fuzzy_find_candidates(gfc_component * component,char ** & candidates,size_t & candidates_len)2440 lookup_component_fuzzy_find_candidates (gfc_component *component,
2441 char **&candidates,
2442 size_t &candidates_len)
2443 {
2444 for (gfc_component *p = component; p; p = p->next)
2445 vec_push (candidates, candidates_len, p->name);
2446 }
2447
2448
2449 /* Lookup component MEMBER fuzzily, taking names in COMPONENT into account. */
2450
2451 static const char*
lookup_component_fuzzy(const char * member,gfc_component * component)2452 lookup_component_fuzzy (const char *member, gfc_component *component)
2453 {
2454 char **candidates = NULL;
2455 size_t candidates_len = 0;
2456 lookup_component_fuzzy_find_candidates (component, candidates,
2457 candidates_len);
2458 return gfc_closest_fuzzy_match (member, candidates);
2459 }
2460
2461
2462 /* Given a derived type node and a component name, try to locate the
2463 component structure. Returns the NULL pointer if the component is
2464 not found or the components are private. If noaccess is set, no access
2465 checks are done. If silent is set, an error will not be generated if
2466 the component cannot be found or accessed.
2467
2468 If ref is not NULL, *ref is set to represent the chain of components
2469 required to get to the ultimate component.
2470
2471 If the component is simply a direct subcomponent, or is inherited from a
2472 parent derived type in the given derived type, this is a single ref with its
2473 component set to the returned component.
2474
2475 Otherwise, *ref is constructed as a chain of subcomponents. This occurs
2476 when the component is found through an implicit chain of nested union and
2477 map components. Unions and maps are "anonymous" substructures in FORTRAN
2478 which cannot be explicitly referenced, but the reference chain must be
2479 considered as in C for backend translation to correctly compute layouts.
2480 (For example, x.a may refer to x->(UNION)->(MAP)->(UNION)->(MAP)->a). */
2481
2482 gfc_component *
gfc_find_component(gfc_symbol * sym,const char * name,bool noaccess,bool silent,gfc_ref ** ref)2483 gfc_find_component (gfc_symbol *sym, const char *name,
2484 bool noaccess, bool silent, gfc_ref **ref)
2485 {
2486 gfc_component *p, *check;
2487 gfc_ref *sref = NULL, *tmp = NULL;
2488
2489 if (name == NULL || sym == NULL)
2490 return NULL;
2491
2492 if (sym->attr.flavor == FL_DERIVED)
2493 sym = gfc_use_derived (sym);
2494 else
2495 gcc_assert (gfc_fl_struct (sym->attr.flavor));
2496
2497 if (sym == NULL)
2498 return NULL;
2499
2500 /* Handle UNIONs specially - mutually recursive with gfc_find_component. */
2501 if (sym->attr.flavor == FL_UNION)
2502 return find_union_component (sym, name, noaccess, ref);
2503
2504 if (ref) *ref = NULL;
2505 for (p = sym->components; p; p = p->next)
2506 {
2507 /* Nest search into union's maps. */
2508 if (p->ts.type == BT_UNION)
2509 {
2510 check = find_union_component (p->ts.u.derived, name, noaccess, &tmp);
2511 if (check != NULL)
2512 {
2513 /* Union ref. */
2514 if (ref)
2515 {
2516 sref = gfc_get_ref ();
2517 sref->type = REF_COMPONENT;
2518 sref->u.c.component = p;
2519 sref->u.c.sym = p->ts.u.derived;
2520 sref->next = tmp;
2521 *ref = sref;
2522 }
2523 return check;
2524 }
2525 }
2526 else if (strcmp (p->name, name) == 0)
2527 break;
2528
2529 continue;
2530 }
2531
2532 if (p && sym->attr.use_assoc && !noaccess)
2533 {
2534 bool is_parent_comp = sym->attr.extension && (p == sym->components);
2535 if (p->attr.access == ACCESS_PRIVATE ||
2536 (p->attr.access != ACCESS_PUBLIC
2537 && sym->component_access == ACCESS_PRIVATE
2538 && !is_parent_comp))
2539 {
2540 if (!silent)
2541 gfc_error ("Component %qs at %C is a PRIVATE component of %qs",
2542 name, sym->name);
2543 return NULL;
2544 }
2545 }
2546
2547 if (p == NULL
2548 && sym->attr.extension
2549 && sym->components->ts.type == BT_DERIVED)
2550 {
2551 p = gfc_find_component (sym->components->ts.u.derived, name,
2552 noaccess, silent, ref);
2553 /* Do not overwrite the error. */
2554 if (p == NULL)
2555 return p;
2556 }
2557
2558 if (p == NULL && !silent)
2559 {
2560 const char *guessed = lookup_component_fuzzy (name, sym->components);
2561 if (guessed)
2562 gfc_error ("%qs at %C is not a member of the %qs structure"
2563 "; did you mean %qs?",
2564 name, sym->name, guessed);
2565 else
2566 gfc_error ("%qs at %C is not a member of the %qs structure",
2567 name, sym->name);
2568 }
2569
2570 /* Component was found; build the ultimate component reference. */
2571 if (p != NULL && ref)
2572 {
2573 tmp = gfc_get_ref ();
2574 tmp->type = REF_COMPONENT;
2575 tmp->u.c.component = p;
2576 tmp->u.c.sym = sym;
2577 /* Link the final component ref to the end of the chain of subrefs. */
2578 if (sref)
2579 {
2580 *ref = sref;
2581 for (; sref->next; sref = sref->next)
2582 ;
2583 sref->next = tmp;
2584 }
2585 else
2586 *ref = tmp;
2587 }
2588
2589 return p;
2590 }
2591
2592
2593 /* Given a symbol, free all of the component structures and everything
2594 they point to. */
2595
2596 static void
free_components(gfc_component * p)2597 free_components (gfc_component *p)
2598 {
2599 gfc_component *q;
2600
2601 for (; p; p = q)
2602 {
2603 q = p->next;
2604
2605 gfc_free_array_spec (p->as);
2606 gfc_free_expr (p->initializer);
2607 if (p->kind_expr)
2608 gfc_free_expr (p->kind_expr);
2609 if (p->param_list)
2610 gfc_free_actual_arglist (p->param_list);
2611 free (p->tb);
2612
2613 free (p);
2614 }
2615 }
2616
2617
2618 /******************** Statement label management ********************/
2619
2620 /* Comparison function for statement labels, used for managing the
2621 binary tree. */
2622
2623 static int
compare_st_labels(void * a1,void * b1)2624 compare_st_labels (void *a1, void *b1)
2625 {
2626 int a = ((gfc_st_label *) a1)->value;
2627 int b = ((gfc_st_label *) b1)->value;
2628
2629 return (b - a);
2630 }
2631
2632
2633 /* Free a single gfc_st_label structure, making sure the tree is not
2634 messed up. This function is called only when some parse error
2635 occurs. */
2636
2637 void
gfc_free_st_label(gfc_st_label * label)2638 gfc_free_st_label (gfc_st_label *label)
2639 {
2640
2641 if (label == NULL)
2642 return;
2643
2644 gfc_delete_bbt (&label->ns->st_labels, label, compare_st_labels);
2645
2646 if (label->format != NULL)
2647 gfc_free_expr (label->format);
2648
2649 free (label);
2650 }
2651
2652
2653 /* Free a whole tree of gfc_st_label structures. */
2654
2655 static void
free_st_labels(gfc_st_label * label)2656 free_st_labels (gfc_st_label *label)
2657 {
2658
2659 if (label == NULL)
2660 return;
2661
2662 free_st_labels (label->left);
2663 free_st_labels (label->right);
2664
2665 if (label->format != NULL)
2666 gfc_free_expr (label->format);
2667 free (label);
2668 }
2669
2670
2671 /* Given a label number, search for and return a pointer to the label
2672 structure, creating it if it does not exist. */
2673
2674 gfc_st_label *
gfc_get_st_label(int labelno)2675 gfc_get_st_label (int labelno)
2676 {
2677 gfc_st_label *lp;
2678 gfc_namespace *ns;
2679
2680 if (gfc_current_state () == COMP_DERIVED)
2681 ns = gfc_current_block ()->f2k_derived;
2682 else
2683 {
2684 /* Find the namespace of the scoping unit:
2685 If we're in a BLOCK construct, jump to the parent namespace. */
2686 ns = gfc_current_ns;
2687 while (ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL)
2688 ns = ns->parent;
2689 }
2690
2691 /* First see if the label is already in this namespace. */
2692 lp = ns->st_labels;
2693 while (lp)
2694 {
2695 if (lp->value == labelno)
2696 return lp;
2697
2698 if (lp->value < labelno)
2699 lp = lp->left;
2700 else
2701 lp = lp->right;
2702 }
2703
2704 lp = XCNEW (gfc_st_label);
2705
2706 lp->value = labelno;
2707 lp->defined = ST_LABEL_UNKNOWN;
2708 lp->referenced = ST_LABEL_UNKNOWN;
2709 lp->ns = ns;
2710
2711 gfc_insert_bbt (&ns->st_labels, lp, compare_st_labels);
2712
2713 return lp;
2714 }
2715
2716
2717 /* Called when a statement with a statement label is about to be
2718 accepted. We add the label to the list of the current namespace,
2719 making sure it hasn't been defined previously and referenced
2720 correctly. */
2721
2722 void
gfc_define_st_label(gfc_st_label * lp,gfc_sl_type type,locus * label_locus)2723 gfc_define_st_label (gfc_st_label *lp, gfc_sl_type type, locus *label_locus)
2724 {
2725 int labelno;
2726
2727 labelno = lp->value;
2728
2729 if (lp->defined != ST_LABEL_UNKNOWN)
2730 gfc_error ("Duplicate statement label %d at %L and %L", labelno,
2731 &lp->where, label_locus);
2732 else
2733 {
2734 lp->where = *label_locus;
2735
2736 switch (type)
2737 {
2738 case ST_LABEL_FORMAT:
2739 if (lp->referenced == ST_LABEL_TARGET
2740 || lp->referenced == ST_LABEL_DO_TARGET)
2741 gfc_error ("Label %d at %C already referenced as branch target",
2742 labelno);
2743 else
2744 lp->defined = ST_LABEL_FORMAT;
2745
2746 break;
2747
2748 case ST_LABEL_TARGET:
2749 case ST_LABEL_DO_TARGET:
2750 if (lp->referenced == ST_LABEL_FORMAT)
2751 gfc_error ("Label %d at %C already referenced as a format label",
2752 labelno);
2753 else
2754 lp->defined = type;
2755
2756 if (lp->referenced == ST_LABEL_DO_TARGET && type != ST_LABEL_DO_TARGET
2757 && !gfc_notify_std (GFC_STD_F95_OBS | GFC_STD_F2018_DEL,
2758 "DO termination statement which is not END DO"
2759 " or CONTINUE with label %d at %C", labelno))
2760 return;
2761 break;
2762
2763 default:
2764 lp->defined = ST_LABEL_BAD_TARGET;
2765 lp->referenced = ST_LABEL_BAD_TARGET;
2766 }
2767 }
2768 }
2769
2770
2771 /* Reference a label. Given a label and its type, see if that
2772 reference is consistent with what is known about that label,
2773 updating the unknown state. Returns false if something goes
2774 wrong. */
2775
2776 bool
gfc_reference_st_label(gfc_st_label * lp,gfc_sl_type type)2777 gfc_reference_st_label (gfc_st_label *lp, gfc_sl_type type)
2778 {
2779 gfc_sl_type label_type;
2780 int labelno;
2781 bool rc;
2782
2783 if (lp == NULL)
2784 return true;
2785
2786 labelno = lp->value;
2787
2788 if (lp->defined != ST_LABEL_UNKNOWN)
2789 label_type = lp->defined;
2790 else
2791 {
2792 label_type = lp->referenced;
2793 lp->where = gfc_current_locus;
2794 }
2795
2796 if (label_type == ST_LABEL_FORMAT
2797 && (type == ST_LABEL_TARGET || type == ST_LABEL_DO_TARGET))
2798 {
2799 gfc_error ("Label %d at %C previously used as a FORMAT label", labelno);
2800 rc = false;
2801 goto done;
2802 }
2803
2804 if ((label_type == ST_LABEL_TARGET || label_type == ST_LABEL_DO_TARGET
2805 || label_type == ST_LABEL_BAD_TARGET)
2806 && type == ST_LABEL_FORMAT)
2807 {
2808 gfc_error ("Label %d at %C previously used as branch target", labelno);
2809 rc = false;
2810 goto done;
2811 }
2812
2813 if (lp->referenced == ST_LABEL_DO_TARGET && type == ST_LABEL_DO_TARGET
2814 && !gfc_notify_std (GFC_STD_F95_OBS | GFC_STD_F2018_DEL,
2815 "Shared DO termination label %d at %C", labelno))
2816 return false;
2817
2818 if (type == ST_LABEL_DO_TARGET
2819 && !gfc_notify_std (GFC_STD_F2018_OBS, "Labeled DO statement "
2820 "at %L", &gfc_current_locus))
2821 return false;
2822
2823 if (lp->referenced != ST_LABEL_DO_TARGET)
2824 lp->referenced = type;
2825 rc = true;
2826
2827 done:
2828 return rc;
2829 }
2830
2831
2832 /************** Symbol table management subroutines ****************/
2833
2834 /* Basic details: Fortran 95 requires a potentially unlimited number
2835 of distinct namespaces when compiling a program unit. This case
2836 occurs during a compilation of internal subprograms because all of
2837 the internal subprograms must be read before we can start
2838 generating code for the host.
2839
2840 Given the tricky nature of the Fortran grammar, we must be able to
2841 undo changes made to a symbol table if the current interpretation
2842 of a statement is found to be incorrect. Whenever a symbol is
2843 looked up, we make a copy of it and link to it. All of these
2844 symbols are kept in a vector so that we can commit or
2845 undo the changes at a later time.
2846
2847 A symtree may point to a symbol node outside of its namespace. In
2848 this case, that symbol has been used as a host associated variable
2849 at some previous time. */
2850
2851 /* Allocate a new namespace structure. Copies the implicit types from
2852 PARENT if PARENT_TYPES is set. */
2853
2854 gfc_namespace *
gfc_get_namespace(gfc_namespace * parent,int parent_types)2855 gfc_get_namespace (gfc_namespace *parent, int parent_types)
2856 {
2857 gfc_namespace *ns;
2858 gfc_typespec *ts;
2859 int in;
2860 int i;
2861
2862 ns = XCNEW (gfc_namespace);
2863 ns->sym_root = NULL;
2864 ns->uop_root = NULL;
2865 ns->tb_sym_root = NULL;
2866 ns->finalizers = NULL;
2867 ns->default_access = ACCESS_UNKNOWN;
2868 ns->parent = parent;
2869
2870 for (in = GFC_INTRINSIC_BEGIN; in != GFC_INTRINSIC_END; in++)
2871 {
2872 ns->operator_access[in] = ACCESS_UNKNOWN;
2873 ns->tb_op[in] = NULL;
2874 }
2875
2876 /* Initialize default implicit types. */
2877 for (i = 'a'; i <= 'z'; i++)
2878 {
2879 ns->set_flag[i - 'a'] = 0;
2880 ts = &ns->default_type[i - 'a'];
2881
2882 if (parent_types && ns->parent != NULL)
2883 {
2884 /* Copy parent settings. */
2885 *ts = ns->parent->default_type[i - 'a'];
2886 continue;
2887 }
2888
2889 if (flag_implicit_none != 0)
2890 {
2891 gfc_clear_ts (ts);
2892 continue;
2893 }
2894
2895 if ('i' <= i && i <= 'n')
2896 {
2897 ts->type = BT_INTEGER;
2898 ts->kind = gfc_default_integer_kind;
2899 }
2900 else
2901 {
2902 ts->type = BT_REAL;
2903 ts->kind = gfc_default_real_kind;
2904 }
2905 }
2906
2907 ns->refs = 1;
2908
2909 return ns;
2910 }
2911
2912
2913 /* Comparison function for symtree nodes. */
2914
2915 static int
compare_symtree(void * _st1,void * _st2)2916 compare_symtree (void *_st1, void *_st2)
2917 {
2918 gfc_symtree *st1, *st2;
2919
2920 st1 = (gfc_symtree *) _st1;
2921 st2 = (gfc_symtree *) _st2;
2922
2923 return strcmp (st1->name, st2->name);
2924 }
2925
2926
2927 /* Allocate a new symtree node and associate it with the new symbol. */
2928
2929 gfc_symtree *
gfc_new_symtree(gfc_symtree ** root,const char * name)2930 gfc_new_symtree (gfc_symtree **root, const char *name)
2931 {
2932 gfc_symtree *st;
2933
2934 st = XCNEW (gfc_symtree);
2935 st->name = gfc_get_string ("%s", name);
2936
2937 gfc_insert_bbt (root, st, compare_symtree);
2938 return st;
2939 }
2940
2941
2942 /* Delete a symbol from the tree. Does not free the symbol itself! */
2943
2944 void
gfc_delete_symtree(gfc_symtree ** root,const char * name)2945 gfc_delete_symtree (gfc_symtree **root, const char *name)
2946 {
2947 gfc_symtree st, *st0;
2948 const char *p;
2949
2950 /* Submodules are marked as mod.submod. When freeing a submodule
2951 symbol, the symtree only has "submod", so adjust that here. */
2952
2953 p = strrchr(name, '.');
2954 if (p)
2955 p++;
2956 else
2957 p = name;
2958
2959 st0 = gfc_find_symtree (*root, p);
2960
2961 st.name = gfc_get_string ("%s", p);
2962 gfc_delete_bbt (root, &st, compare_symtree);
2963
2964 free (st0);
2965 }
2966
2967
2968 /* Given a root symtree node and a name, try to find the symbol within
2969 the namespace. Returns NULL if the symbol is not found. */
2970
2971 gfc_symtree *
gfc_find_symtree(gfc_symtree * st,const char * name)2972 gfc_find_symtree (gfc_symtree *st, const char *name)
2973 {
2974 int c;
2975
2976 while (st != NULL)
2977 {
2978 c = strcmp (name, st->name);
2979 if (c == 0)
2980 return st;
2981
2982 st = (c < 0) ? st->left : st->right;
2983 }
2984
2985 return NULL;
2986 }
2987
2988
2989 /* Return a symtree node with a name that is guaranteed to be unique
2990 within the namespace and corresponds to an illegal fortran name. */
2991
2992 gfc_symtree *
gfc_get_unique_symtree(gfc_namespace * ns)2993 gfc_get_unique_symtree (gfc_namespace *ns)
2994 {
2995 char name[GFC_MAX_SYMBOL_LEN + 1];
2996 static int serial = 0;
2997
2998 sprintf (name, "@%d", serial++);
2999 return gfc_new_symtree (&ns->sym_root, name);
3000 }
3001
3002
3003 /* Given a name find a user operator node, creating it if it doesn't
3004 exist. These are much simpler than symbols because they can't be
3005 ambiguous with one another. */
3006
3007 gfc_user_op *
gfc_get_uop(const char * name)3008 gfc_get_uop (const char *name)
3009 {
3010 gfc_user_op *uop;
3011 gfc_symtree *st;
3012 gfc_namespace *ns = gfc_current_ns;
3013
3014 if (ns->omp_udr_ns)
3015 ns = ns->parent;
3016 st = gfc_find_symtree (ns->uop_root, name);
3017 if (st != NULL)
3018 return st->n.uop;
3019
3020 st = gfc_new_symtree (&ns->uop_root, name);
3021
3022 uop = st->n.uop = XCNEW (gfc_user_op);
3023 uop->name = gfc_get_string ("%s", name);
3024 uop->access = ACCESS_UNKNOWN;
3025 uop->ns = ns;
3026
3027 return uop;
3028 }
3029
3030
3031 /* Given a name find the user operator node. Returns NULL if it does
3032 not exist. */
3033
3034 gfc_user_op *
gfc_find_uop(const char * name,gfc_namespace * ns)3035 gfc_find_uop (const char *name, gfc_namespace *ns)
3036 {
3037 gfc_symtree *st;
3038
3039 if (ns == NULL)
3040 ns = gfc_current_ns;
3041
3042 st = gfc_find_symtree (ns->uop_root, name);
3043 return (st == NULL) ? NULL : st->n.uop;
3044 }
3045
3046
3047 /* Update a symbol's common_block field, and take care of the associated
3048 memory management. */
3049
3050 static void
set_symbol_common_block(gfc_symbol * sym,gfc_common_head * common_block)3051 set_symbol_common_block (gfc_symbol *sym, gfc_common_head *common_block)
3052 {
3053 if (sym->common_block == common_block)
3054 return;
3055
3056 if (sym->common_block && sym->common_block->name[0] != '\0')
3057 {
3058 sym->common_block->refs--;
3059 if (sym->common_block->refs == 0)
3060 free (sym->common_block);
3061 }
3062 sym->common_block = common_block;
3063 }
3064
3065
3066 /* Remove a gfc_symbol structure and everything it points to. */
3067
3068 void
gfc_free_symbol(gfc_symbol * sym)3069 gfc_free_symbol (gfc_symbol *sym)
3070 {
3071
3072 if (sym == NULL)
3073 return;
3074
3075 gfc_free_array_spec (sym->as);
3076
3077 free_components (sym->components);
3078
3079 gfc_free_expr (sym->value);
3080
3081 gfc_free_namelist (sym->namelist);
3082
3083 if (sym->ns != sym->formal_ns)
3084 gfc_free_namespace (sym->formal_ns);
3085
3086 if (!sym->attr.generic_copy)
3087 gfc_free_interface (sym->generic);
3088
3089 gfc_free_formal_arglist (sym->formal);
3090
3091 gfc_free_namespace (sym->f2k_derived);
3092
3093 set_symbol_common_block (sym, NULL);
3094
3095 if (sym->param_list)
3096 gfc_free_actual_arglist (sym->param_list);
3097
3098 free (sym);
3099 }
3100
3101
3102 /* Decrease the reference counter and free memory when we reach zero. */
3103
3104 void
gfc_release_symbol(gfc_symbol * sym)3105 gfc_release_symbol (gfc_symbol *sym)
3106 {
3107 if (sym == NULL)
3108 return;
3109
3110 if (sym->formal_ns != NULL && sym->refs == 2 && sym->formal_ns != sym->ns
3111 && (!sym->attr.entry || !sym->module))
3112 {
3113 /* As formal_ns contains a reference to sym, delete formal_ns just
3114 before the deletion of sym. */
3115 gfc_namespace *ns = sym->formal_ns;
3116 sym->formal_ns = NULL;
3117 gfc_free_namespace (ns);
3118 }
3119
3120 sym->refs--;
3121 if (sym->refs > 0)
3122 return;
3123
3124 gcc_assert (sym->refs == 0);
3125 gfc_free_symbol (sym);
3126 }
3127
3128
3129 /* Allocate and initialize a new symbol node. */
3130
3131 gfc_symbol *
gfc_new_symbol(const char * name,gfc_namespace * ns)3132 gfc_new_symbol (const char *name, gfc_namespace *ns)
3133 {
3134 gfc_symbol *p;
3135
3136 p = XCNEW (gfc_symbol);
3137
3138 gfc_clear_ts (&p->ts);
3139 gfc_clear_attr (&p->attr);
3140 p->ns = ns;
3141 p->declared_at = gfc_current_locus;
3142 p->name = gfc_get_string ("%s", name);
3143
3144 return p;
3145 }
3146
3147
3148 /* Generate an error if a symbol is ambiguous. */
3149
3150 static void
ambiguous_symbol(const char * name,gfc_symtree * st)3151 ambiguous_symbol (const char *name, gfc_symtree *st)
3152 {
3153
3154 if (st->n.sym->module)
3155 gfc_error ("Name %qs at %C is an ambiguous reference to %qs "
3156 "from module %qs", name, st->n.sym->name, st->n.sym->module);
3157 else
3158 gfc_error ("Name %qs at %C is an ambiguous reference to %qs "
3159 "from current program unit", name, st->n.sym->name);
3160 }
3161
3162
3163 /* If we're in a SELECT TYPE block, check if the variable 'st' matches any
3164 selector on the stack. If yes, replace it by the corresponding temporary. */
3165
3166 static void
select_type_insert_tmp(gfc_symtree ** st)3167 select_type_insert_tmp (gfc_symtree **st)
3168 {
3169 gfc_select_type_stack *stack = select_type_stack;
3170 for (; stack; stack = stack->prev)
3171 if ((*st)->n.sym == stack->selector && stack->tmp)
3172 {
3173 *st = stack->tmp;
3174 select_type_insert_tmp (st);
3175 return;
3176 }
3177 }
3178
3179
3180 /* Look for a symtree in the current procedure -- that is, go up to
3181 parent namespaces but only if inside a BLOCK. Returns NULL if not found. */
3182
3183 gfc_symtree*
gfc_find_symtree_in_proc(const char * name,gfc_namespace * ns)3184 gfc_find_symtree_in_proc (const char* name, gfc_namespace* ns)
3185 {
3186 while (ns)
3187 {
3188 gfc_symtree* st = gfc_find_symtree (ns->sym_root, name);
3189 if (st)
3190 return st;
3191
3192 if (!ns->construct_entities)
3193 break;
3194 ns = ns->parent;
3195 }
3196
3197 return NULL;
3198 }
3199
3200
3201 /* Search for a symtree starting in the current namespace, resorting to
3202 any parent namespaces if requested by a nonzero parent_flag.
3203 Returns nonzero if the name is ambiguous. */
3204
3205 int
gfc_find_sym_tree(const char * name,gfc_namespace * ns,int parent_flag,gfc_symtree ** result)3206 gfc_find_sym_tree (const char *name, gfc_namespace *ns, int parent_flag,
3207 gfc_symtree **result)
3208 {
3209 gfc_symtree *st;
3210
3211 if (ns == NULL)
3212 ns = gfc_current_ns;
3213
3214 do
3215 {
3216 st = gfc_find_symtree (ns->sym_root, name);
3217 if (st != NULL)
3218 {
3219 select_type_insert_tmp (&st);
3220
3221 *result = st;
3222 /* Ambiguous generic interfaces are permitted, as long
3223 as the specific interfaces are different. */
3224 if (st->ambiguous && !st->n.sym->attr.generic)
3225 {
3226 ambiguous_symbol (name, st);
3227 return 1;
3228 }
3229
3230 return 0;
3231 }
3232
3233 if (!parent_flag)
3234 break;
3235
3236 /* Don't escape an interface block. */
3237 if (ns && !ns->has_import_set
3238 && ns->proc_name && ns->proc_name->attr.if_source == IFSRC_IFBODY)
3239 break;
3240
3241 ns = ns->parent;
3242 }
3243 while (ns != NULL);
3244
3245 if (gfc_current_state() == COMP_DERIVED
3246 && gfc_current_block ()->attr.pdt_template)
3247 {
3248 gfc_symbol *der = gfc_current_block ();
3249 for (; der; der = gfc_get_derived_super_type (der))
3250 {
3251 if (der->f2k_derived && der->f2k_derived->sym_root)
3252 {
3253 st = gfc_find_symtree (der->f2k_derived->sym_root, name);
3254 if (st)
3255 break;
3256 }
3257 }
3258 *result = st;
3259 return 0;
3260 }
3261
3262 *result = NULL;
3263
3264 return 0;
3265 }
3266
3267
3268 /* Same, but returns the symbol instead. */
3269
3270 int
gfc_find_symbol(const char * name,gfc_namespace * ns,int parent_flag,gfc_symbol ** result)3271 gfc_find_symbol (const char *name, gfc_namespace *ns, int parent_flag,
3272 gfc_symbol **result)
3273 {
3274 gfc_symtree *st;
3275 int i;
3276
3277 i = gfc_find_sym_tree (name, ns, parent_flag, &st);
3278
3279 if (st == NULL)
3280 *result = NULL;
3281 else
3282 *result = st->n.sym;
3283
3284 return i;
3285 }
3286
3287
3288 /* Tells whether there is only one set of changes in the stack. */
3289
3290 static bool
single_undo_checkpoint_p(void)3291 single_undo_checkpoint_p (void)
3292 {
3293 if (latest_undo_chgset == &default_undo_chgset_var)
3294 {
3295 gcc_assert (latest_undo_chgset->previous == NULL);
3296 return true;
3297 }
3298 else
3299 {
3300 gcc_assert (latest_undo_chgset->previous != NULL);
3301 return false;
3302 }
3303 }
3304
3305 /* Save symbol with the information necessary to back it out. */
3306
3307 void
gfc_save_symbol_data(gfc_symbol * sym)3308 gfc_save_symbol_data (gfc_symbol *sym)
3309 {
3310 gfc_symbol *s;
3311 unsigned i;
3312
3313 if (!single_undo_checkpoint_p ())
3314 {
3315 /* If there is more than one change set, look for the symbol in the
3316 current one. If it is found there, we can reuse it. */
3317 FOR_EACH_VEC_ELT (latest_undo_chgset->syms, i, s)
3318 if (s == sym)
3319 {
3320 gcc_assert (sym->gfc_new || sym->old_symbol != NULL);
3321 return;
3322 }
3323 }
3324 else if (sym->gfc_new || sym->old_symbol != NULL)
3325 return;
3326
3327 s = XCNEW (gfc_symbol);
3328 *s = *sym;
3329 sym->old_symbol = s;
3330 sym->gfc_new = 0;
3331
3332 latest_undo_chgset->syms.safe_push (sym);
3333 }
3334
3335
3336 /* Given a name, find a symbol, or create it if it does not exist yet
3337 in the current namespace. If the symbol is found we make sure that
3338 it's OK.
3339
3340 The integer return code indicates
3341 0 All OK
3342 1 The symbol name was ambiguous
3343 2 The name meant to be established was already host associated.
3344
3345 So if the return value is nonzero, then an error was issued. */
3346
3347 int
gfc_get_sym_tree(const char * name,gfc_namespace * ns,gfc_symtree ** result,bool allow_subroutine)3348 gfc_get_sym_tree (const char *name, gfc_namespace *ns, gfc_symtree **result,
3349 bool allow_subroutine)
3350 {
3351 gfc_symtree *st;
3352 gfc_symbol *p;
3353
3354 /* This doesn't usually happen during resolution. */
3355 if (ns == NULL)
3356 ns = gfc_current_ns;
3357
3358 /* Try to find the symbol in ns. */
3359 st = gfc_find_symtree (ns->sym_root, name);
3360
3361 if (st == NULL && ns->omp_udr_ns)
3362 {
3363 ns = ns->parent;
3364 st = gfc_find_symtree (ns->sym_root, name);
3365 }
3366
3367 if (st == NULL)
3368 {
3369 /* If not there, create a new symbol. */
3370 p = gfc_new_symbol (name, ns);
3371
3372 /* Add to the list of tentative symbols. */
3373 p->old_symbol = NULL;
3374 p->mark = 1;
3375 p->gfc_new = 1;
3376 latest_undo_chgset->syms.safe_push (p);
3377
3378 st = gfc_new_symtree (&ns->sym_root, name);
3379 st->n.sym = p;
3380 p->refs++;
3381
3382 }
3383 else
3384 {
3385 /* Make sure the existing symbol is OK. Ambiguous
3386 generic interfaces are permitted, as long as the
3387 specific interfaces are different. */
3388 if (st->ambiguous && !st->n.sym->attr.generic)
3389 {
3390 ambiguous_symbol (name, st);
3391 return 1;
3392 }
3393
3394 p = st->n.sym;
3395 if (p->ns != ns && (!p->attr.function || ns->proc_name != p)
3396 && !(allow_subroutine && p->attr.subroutine)
3397 && !(ns->proc_name && ns->proc_name->attr.if_source == IFSRC_IFBODY
3398 && (ns->has_import_set || p->attr.imported)))
3399 {
3400 /* Symbol is from another namespace. */
3401 gfc_error ("Symbol %qs at %C has already been host associated",
3402 name);
3403 return 2;
3404 }
3405
3406 p->mark = 1;
3407
3408 /* Copy in case this symbol is changed. */
3409 gfc_save_symbol_data (p);
3410 }
3411
3412 *result = st;
3413 return 0;
3414 }
3415
3416
3417 int
gfc_get_symbol(const char * name,gfc_namespace * ns,gfc_symbol ** result)3418 gfc_get_symbol (const char *name, gfc_namespace *ns, gfc_symbol **result)
3419 {
3420 gfc_symtree *st;
3421 int i;
3422
3423 i = gfc_get_sym_tree (name, ns, &st, false);
3424 if (i != 0)
3425 return i;
3426
3427 if (st)
3428 *result = st->n.sym;
3429 else
3430 *result = NULL;
3431 return i;
3432 }
3433
3434
3435 /* Subroutine that searches for a symbol, creating it if it doesn't
3436 exist, but tries to host-associate the symbol if possible. */
3437
3438 int
gfc_get_ha_sym_tree(const char * name,gfc_symtree ** result)3439 gfc_get_ha_sym_tree (const char *name, gfc_symtree **result)
3440 {
3441 gfc_symtree *st;
3442 int i;
3443
3444 i = gfc_find_sym_tree (name, gfc_current_ns, 0, &st);
3445
3446 if (st != NULL)
3447 {
3448 gfc_save_symbol_data (st->n.sym);
3449 *result = st;
3450 return i;
3451 }
3452
3453 i = gfc_find_sym_tree (name, gfc_current_ns, 1, &st);
3454 if (i)
3455 return i;
3456
3457 if (st != NULL)
3458 {
3459 *result = st;
3460 return 0;
3461 }
3462
3463 return gfc_get_sym_tree (name, gfc_current_ns, result, false);
3464 }
3465
3466
3467 int
gfc_get_ha_symbol(const char * name,gfc_symbol ** result)3468 gfc_get_ha_symbol (const char *name, gfc_symbol **result)
3469 {
3470 int i;
3471 gfc_symtree *st;
3472
3473 i = gfc_get_ha_sym_tree (name, &st);
3474
3475 if (st)
3476 *result = st->n.sym;
3477 else
3478 *result = NULL;
3479
3480 return i;
3481 }
3482
3483
3484 /* Search for the symtree belonging to a gfc_common_head; we cannot use
3485 head->name as the common_root symtree's name might be mangled. */
3486
3487 static gfc_symtree *
find_common_symtree(gfc_symtree * st,gfc_common_head * head)3488 find_common_symtree (gfc_symtree *st, gfc_common_head *head)
3489 {
3490
3491 gfc_symtree *result;
3492
3493 if (st == NULL)
3494 return NULL;
3495
3496 if (st->n.common == head)
3497 return st;
3498
3499 result = find_common_symtree (st->left, head);
3500 if (!result)
3501 result = find_common_symtree (st->right, head);
3502
3503 return result;
3504 }
3505
3506
3507 /* Restore previous state of symbol. Just copy simple stuff. */
3508
3509 static void
restore_old_symbol(gfc_symbol * p)3510 restore_old_symbol (gfc_symbol *p)
3511 {
3512 gfc_symbol *old;
3513
3514 p->mark = 0;
3515 old = p->old_symbol;
3516
3517 p->ts.type = old->ts.type;
3518 p->ts.kind = old->ts.kind;
3519
3520 p->attr = old->attr;
3521
3522 if (p->value != old->value)
3523 {
3524 gcc_checking_assert (old->value == NULL);
3525 gfc_free_expr (p->value);
3526 p->value = NULL;
3527 }
3528
3529 if (p->as != old->as)
3530 {
3531 if (p->as)
3532 gfc_free_array_spec (p->as);
3533 p->as = old->as;
3534 }
3535
3536 p->generic = old->generic;
3537 p->component_access = old->component_access;
3538
3539 if (p->namelist != NULL && old->namelist == NULL)
3540 {
3541 gfc_free_namelist (p->namelist);
3542 p->namelist = NULL;
3543 }
3544 else
3545 {
3546 if (p->namelist_tail != old->namelist_tail)
3547 {
3548 gfc_free_namelist (old->namelist_tail->next);
3549 old->namelist_tail->next = NULL;
3550 }
3551 }
3552
3553 p->namelist_tail = old->namelist_tail;
3554
3555 if (p->formal != old->formal)
3556 {
3557 gfc_free_formal_arglist (p->formal);
3558 p->formal = old->formal;
3559 }
3560
3561 set_symbol_common_block (p, old->common_block);
3562 p->common_head = old->common_head;
3563
3564 p->old_symbol = old->old_symbol;
3565 free (old);
3566 }
3567
3568
3569 /* Frees the internal data of a gfc_undo_change_set structure. Doesn't free
3570 the structure itself. */
3571
3572 static void
free_undo_change_set_data(gfc_undo_change_set & cs)3573 free_undo_change_set_data (gfc_undo_change_set &cs)
3574 {
3575 cs.syms.release ();
3576 cs.tbps.release ();
3577 }
3578
3579
3580 /* Given a change set pointer, free its target's contents and update it with
3581 the address of the previous change set. Note that only the contents are
3582 freed, not the target itself (the contents' container). It is not a problem
3583 as the latter will be a local variable usually. */
3584
3585 static void
pop_undo_change_set(gfc_undo_change_set * & cs)3586 pop_undo_change_set (gfc_undo_change_set *&cs)
3587 {
3588 free_undo_change_set_data (*cs);
3589 cs = cs->previous;
3590 }
3591
3592
3593 static void free_old_symbol (gfc_symbol *sym);
3594
3595
3596 /* Merges the current change set into the previous one. The changes themselves
3597 are left untouched; only one checkpoint is forgotten. */
3598
3599 void
gfc_drop_last_undo_checkpoint(void)3600 gfc_drop_last_undo_checkpoint (void)
3601 {
3602 gfc_symbol *s, *t;
3603 unsigned i, j;
3604
3605 FOR_EACH_VEC_ELT (latest_undo_chgset->syms, i, s)
3606 {
3607 /* No need to loop in this case. */
3608 if (s->old_symbol == NULL)
3609 continue;
3610
3611 /* Remove the duplicate symbols. */
3612 FOR_EACH_VEC_ELT (latest_undo_chgset->previous->syms, j, t)
3613 if (t == s)
3614 {
3615 latest_undo_chgset->previous->syms.unordered_remove (j);
3616
3617 /* S->OLD_SYMBOL is the backup symbol for S as it was at the
3618 last checkpoint. We drop that checkpoint, so S->OLD_SYMBOL
3619 shall contain from now on the backup symbol for S as it was
3620 at the checkpoint before. */
3621 if (s->old_symbol->gfc_new)
3622 {
3623 gcc_assert (s->old_symbol->old_symbol == NULL);
3624 s->gfc_new = s->old_symbol->gfc_new;
3625 free_old_symbol (s);
3626 }
3627 else
3628 restore_old_symbol (s->old_symbol);
3629 break;
3630 }
3631 }
3632
3633 latest_undo_chgset->previous->syms.safe_splice (latest_undo_chgset->syms);
3634 latest_undo_chgset->previous->tbps.safe_splice (latest_undo_chgset->tbps);
3635
3636 pop_undo_change_set (latest_undo_chgset);
3637 }
3638
3639
3640 /* Undoes all the changes made to symbols since the previous checkpoint.
3641 This subroutine is made simpler due to the fact that attributes are
3642 never removed once added. */
3643
3644 void
gfc_restore_last_undo_checkpoint(void)3645 gfc_restore_last_undo_checkpoint (void)
3646 {
3647 gfc_symbol *p;
3648 unsigned i;
3649
3650 FOR_EACH_VEC_ELT (latest_undo_chgset->syms, i, p)
3651 {
3652 /* Symbol in a common block was new. Or was old and just put in common */
3653 if (p->common_block
3654 && (p->gfc_new || !p->old_symbol->common_block))
3655 {
3656 /* If the symbol was added to any common block, it
3657 needs to be removed to stop the resolver looking
3658 for a (possibly) dead symbol. */
3659 if (p->common_block->head == p && !p->common_next)
3660 {
3661 gfc_symtree st, *st0;
3662 st0 = find_common_symtree (p->ns->common_root,
3663 p->common_block);
3664 if (st0)
3665 {
3666 st.name = st0->name;
3667 gfc_delete_bbt (&p->ns->common_root, &st, compare_symtree);
3668 free (st0);
3669 }
3670 }
3671
3672 if (p->common_block->head == p)
3673 p->common_block->head = p->common_next;
3674 else
3675 {
3676 gfc_symbol *cparent, *csym;
3677
3678 cparent = p->common_block->head;
3679 csym = cparent->common_next;
3680
3681 while (csym != p)
3682 {
3683 cparent = csym;
3684 csym = csym->common_next;
3685 }
3686
3687 gcc_assert(cparent->common_next == p);
3688 cparent->common_next = csym->common_next;
3689 }
3690 p->common_next = NULL;
3691 }
3692 if (p->gfc_new)
3693 {
3694 /* The derived type is saved in the symtree with the first
3695 letter capitalized; the all lower-case version to the
3696 derived type contains its associated generic function. */
3697 if (gfc_fl_struct (p->attr.flavor))
3698 gfc_delete_symtree (&p->ns->sym_root,gfc_dt_upper_string (p->name));
3699 else
3700 gfc_delete_symtree (&p->ns->sym_root, p->name);
3701
3702 gfc_release_symbol (p);
3703 }
3704 else
3705 restore_old_symbol (p);
3706 }
3707
3708 latest_undo_chgset->syms.truncate (0);
3709 latest_undo_chgset->tbps.truncate (0);
3710
3711 if (!single_undo_checkpoint_p ())
3712 pop_undo_change_set (latest_undo_chgset);
3713 }
3714
3715
3716 /* Makes sure that there is only one set of changes; in other words we haven't
3717 forgotten to pair a call to gfc_new_checkpoint with a call to either
3718 gfc_drop_last_undo_checkpoint or gfc_restore_last_undo_checkpoint. */
3719
3720 static void
enforce_single_undo_checkpoint(void)3721 enforce_single_undo_checkpoint (void)
3722 {
3723 gcc_checking_assert (single_undo_checkpoint_p ());
3724 }
3725
3726
3727 /* Undoes all the changes made to symbols in the current statement. */
3728
3729 void
gfc_undo_symbols(void)3730 gfc_undo_symbols (void)
3731 {
3732 enforce_single_undo_checkpoint ();
3733 gfc_restore_last_undo_checkpoint ();
3734 }
3735
3736
3737 /* Free sym->old_symbol. sym->old_symbol is mostly a shallow copy of sym; the
3738 components of old_symbol that might need deallocation are the "allocatables"
3739 that are restored in gfc_undo_symbols(), with two exceptions: namelist and
3740 namelist_tail. In case these differ between old_symbol and sym, it's just
3741 because sym->namelist has gotten a few more items. */
3742
3743 static void
free_old_symbol(gfc_symbol * sym)3744 free_old_symbol (gfc_symbol *sym)
3745 {
3746
3747 if (sym->old_symbol == NULL)
3748 return;
3749
3750 if (sym->old_symbol->as != sym->as)
3751 gfc_free_array_spec (sym->old_symbol->as);
3752
3753 if (sym->old_symbol->value != sym->value)
3754 gfc_free_expr (sym->old_symbol->value);
3755
3756 if (sym->old_symbol->formal != sym->formal)
3757 gfc_free_formal_arglist (sym->old_symbol->formal);
3758
3759 free (sym->old_symbol);
3760 sym->old_symbol = NULL;
3761 }
3762
3763
3764 /* Makes the changes made in the current statement permanent-- gets
3765 rid of undo information. */
3766
3767 void
gfc_commit_symbols(void)3768 gfc_commit_symbols (void)
3769 {
3770 gfc_symbol *p;
3771 gfc_typebound_proc *tbp;
3772 unsigned i;
3773
3774 enforce_single_undo_checkpoint ();
3775
3776 FOR_EACH_VEC_ELT (latest_undo_chgset->syms, i, p)
3777 {
3778 p->mark = 0;
3779 p->gfc_new = 0;
3780 free_old_symbol (p);
3781 }
3782 latest_undo_chgset->syms.truncate (0);
3783
3784 FOR_EACH_VEC_ELT (latest_undo_chgset->tbps, i, tbp)
3785 tbp->error = 0;
3786 latest_undo_chgset->tbps.truncate (0);
3787 }
3788
3789
3790 /* Makes the changes made in one symbol permanent -- gets rid of undo
3791 information. */
3792
3793 void
gfc_commit_symbol(gfc_symbol * sym)3794 gfc_commit_symbol (gfc_symbol *sym)
3795 {
3796 gfc_symbol *p;
3797 unsigned i;
3798
3799 enforce_single_undo_checkpoint ();
3800
3801 FOR_EACH_VEC_ELT (latest_undo_chgset->syms, i, p)
3802 if (p == sym)
3803 {
3804 latest_undo_chgset->syms.unordered_remove (i);
3805 break;
3806 }
3807
3808 sym->mark = 0;
3809 sym->gfc_new = 0;
3810
3811 free_old_symbol (sym);
3812 }
3813
3814
3815 /* Recursively free trees containing type-bound procedures. */
3816
3817 static void
free_tb_tree(gfc_symtree * t)3818 free_tb_tree (gfc_symtree *t)
3819 {
3820 if (t == NULL)
3821 return;
3822
3823 free_tb_tree (t->left);
3824 free_tb_tree (t->right);
3825
3826 /* TODO: Free type-bound procedure structs themselves; probably needs some
3827 sort of ref-counting mechanism. */
3828
3829 free (t);
3830 }
3831
3832
3833 /* Recursive function that deletes an entire tree and all the common
3834 head structures it points to. */
3835
3836 static void
free_common_tree(gfc_symtree * common_tree)3837 free_common_tree (gfc_symtree * common_tree)
3838 {
3839 if (common_tree == NULL)
3840 return;
3841
3842 free_common_tree (common_tree->left);
3843 free_common_tree (common_tree->right);
3844
3845 free (common_tree);
3846 }
3847
3848
3849 /* Recursive function that deletes an entire tree and all the common
3850 head structures it points to. */
3851
3852 static void
free_omp_udr_tree(gfc_symtree * omp_udr_tree)3853 free_omp_udr_tree (gfc_symtree * omp_udr_tree)
3854 {
3855 if (omp_udr_tree == NULL)
3856 return;
3857
3858 free_omp_udr_tree (omp_udr_tree->left);
3859 free_omp_udr_tree (omp_udr_tree->right);
3860
3861 gfc_free_omp_udr (omp_udr_tree->n.omp_udr);
3862 free (omp_udr_tree);
3863 }
3864
3865
3866 /* Recursive function that deletes an entire tree and all the user
3867 operator nodes that it contains. */
3868
3869 static void
free_uop_tree(gfc_symtree * uop_tree)3870 free_uop_tree (gfc_symtree *uop_tree)
3871 {
3872 if (uop_tree == NULL)
3873 return;
3874
3875 free_uop_tree (uop_tree->left);
3876 free_uop_tree (uop_tree->right);
3877
3878 gfc_free_interface (uop_tree->n.uop->op);
3879 free (uop_tree->n.uop);
3880 free (uop_tree);
3881 }
3882
3883
3884 /* Recursive function that deletes an entire tree and all the symbols
3885 that it contains. */
3886
3887 static void
free_sym_tree(gfc_symtree * sym_tree)3888 free_sym_tree (gfc_symtree *sym_tree)
3889 {
3890 if (sym_tree == NULL)
3891 return;
3892
3893 free_sym_tree (sym_tree->left);
3894 free_sym_tree (sym_tree->right);
3895
3896 gfc_release_symbol (sym_tree->n.sym);
3897 free (sym_tree);
3898 }
3899
3900
3901 /* Free the gfc_equiv_info's. */
3902
3903 static void
gfc_free_equiv_infos(gfc_equiv_info * s)3904 gfc_free_equiv_infos (gfc_equiv_info *s)
3905 {
3906 if (s == NULL)
3907 return;
3908 gfc_free_equiv_infos (s->next);
3909 free (s);
3910 }
3911
3912
3913 /* Free the gfc_equiv_lists. */
3914
3915 static void
gfc_free_equiv_lists(gfc_equiv_list * l)3916 gfc_free_equiv_lists (gfc_equiv_list *l)
3917 {
3918 if (l == NULL)
3919 return;
3920 gfc_free_equiv_lists (l->next);
3921 gfc_free_equiv_infos (l->equiv);
3922 free (l);
3923 }
3924
3925
3926 /* Free a finalizer procedure list. */
3927
3928 void
gfc_free_finalizer(gfc_finalizer * el)3929 gfc_free_finalizer (gfc_finalizer* el)
3930 {
3931 if (el)
3932 {
3933 gfc_release_symbol (el->proc_sym);
3934 free (el);
3935 }
3936 }
3937
3938 static void
gfc_free_finalizer_list(gfc_finalizer * list)3939 gfc_free_finalizer_list (gfc_finalizer* list)
3940 {
3941 while (list)
3942 {
3943 gfc_finalizer* current = list;
3944 list = list->next;
3945 gfc_free_finalizer (current);
3946 }
3947 }
3948
3949
3950 /* Create a new gfc_charlen structure and add it to a namespace.
3951 If 'old_cl' is given, the newly created charlen will be a copy of it. */
3952
3953 gfc_charlen*
gfc_new_charlen(gfc_namespace * ns,gfc_charlen * old_cl)3954 gfc_new_charlen (gfc_namespace *ns, gfc_charlen *old_cl)
3955 {
3956 gfc_charlen *cl;
3957
3958 cl = gfc_get_charlen ();
3959
3960 /* Copy old_cl. */
3961 if (old_cl)
3962 {
3963 cl->length = gfc_copy_expr (old_cl->length);
3964 cl->length_from_typespec = old_cl->length_from_typespec;
3965 cl->backend_decl = old_cl->backend_decl;
3966 cl->passed_length = old_cl->passed_length;
3967 cl->resolved = old_cl->resolved;
3968 }
3969
3970 /* Put into namespace. */
3971 cl->next = ns->cl_list;
3972 ns->cl_list = cl;
3973
3974 return cl;
3975 }
3976
3977
3978 /* Free the charlen list from cl to end (end is not freed).
3979 Free the whole list if end is NULL. */
3980
3981 void
gfc_free_charlen(gfc_charlen * cl,gfc_charlen * end)3982 gfc_free_charlen (gfc_charlen *cl, gfc_charlen *end)
3983 {
3984 gfc_charlen *cl2;
3985
3986 for (; cl != end; cl = cl2)
3987 {
3988 gcc_assert (cl);
3989
3990 cl2 = cl->next;
3991 gfc_free_expr (cl->length);
3992 free (cl);
3993 }
3994 }
3995
3996
3997 /* Free entry list structs. */
3998
3999 static void
free_entry_list(gfc_entry_list * el)4000 free_entry_list (gfc_entry_list *el)
4001 {
4002 gfc_entry_list *next;
4003
4004 if (el == NULL)
4005 return;
4006
4007 next = el->next;
4008 free (el);
4009 free_entry_list (next);
4010 }
4011
4012
4013 /* Free a namespace structure and everything below it. Interface
4014 lists associated with intrinsic operators are not freed. These are
4015 taken care of when a specific name is freed. */
4016
4017 void
gfc_free_namespace(gfc_namespace * ns)4018 gfc_free_namespace (gfc_namespace *ns)
4019 {
4020 gfc_namespace *p, *q;
4021 int i;
4022 gfc_was_finalized *f;
4023
4024 if (ns == NULL)
4025 return;
4026
4027 ns->refs--;
4028 if (ns->refs > 0)
4029 return;
4030
4031 gcc_assert (ns->refs == 0);
4032
4033 gfc_free_statements (ns->code);
4034
4035 free_sym_tree (ns->sym_root);
4036 free_uop_tree (ns->uop_root);
4037 free_common_tree (ns->common_root);
4038 free_omp_udr_tree (ns->omp_udr_root);
4039 free_tb_tree (ns->tb_sym_root);
4040 free_tb_tree (ns->tb_uop_root);
4041 gfc_free_finalizer_list (ns->finalizers);
4042 gfc_free_omp_declare_simd_list (ns->omp_declare_simd);
4043 gfc_free_charlen (ns->cl_list, NULL);
4044 free_st_labels (ns->st_labels);
4045
4046 free_entry_list (ns->entries);
4047 gfc_free_equiv (ns->equiv);
4048 gfc_free_equiv_lists (ns->equiv_lists);
4049 gfc_free_use_stmts (ns->use_stmts);
4050
4051 for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++)
4052 gfc_free_interface (ns->op[i]);
4053
4054 gfc_free_data (ns->data);
4055
4056 /* Free all the expr + component combinations that have been
4057 finalized. */
4058 f = ns->was_finalized;
4059 while (f)
4060 {
4061 gfc_was_finalized* current = f;
4062 f = f->next;
4063 free (current);
4064 }
4065
4066 p = ns->contained;
4067 free (ns);
4068
4069 /* Recursively free any contained namespaces. */
4070 while (p != NULL)
4071 {
4072 q = p;
4073 p = p->sibling;
4074 gfc_free_namespace (q);
4075 }
4076 }
4077
4078
4079 void
gfc_symbol_init_2(void)4080 gfc_symbol_init_2 (void)
4081 {
4082
4083 gfc_current_ns = gfc_get_namespace (NULL, 0);
4084 }
4085
4086
4087 void
gfc_symbol_done_2(void)4088 gfc_symbol_done_2 (void)
4089 {
4090 if (gfc_current_ns != NULL)
4091 {
4092 /* free everything from the root. */
4093 while (gfc_current_ns->parent != NULL)
4094 gfc_current_ns = gfc_current_ns->parent;
4095 gfc_free_namespace (gfc_current_ns);
4096 gfc_current_ns = NULL;
4097 }
4098 gfc_derived_types = NULL;
4099
4100 enforce_single_undo_checkpoint ();
4101 free_undo_change_set_data (*latest_undo_chgset);
4102 }
4103
4104
4105 /* Count how many nodes a symtree has. */
4106
4107 static unsigned
count_st_nodes(const gfc_symtree * st)4108 count_st_nodes (const gfc_symtree *st)
4109 {
4110 unsigned nodes;
4111 if (!st)
4112 return 0;
4113
4114 nodes = count_st_nodes (st->left);
4115 nodes++;
4116 nodes += count_st_nodes (st->right);
4117
4118 return nodes;
4119 }
4120
4121
4122 /* Convert symtree tree into symtree vector. */
4123
4124 static unsigned
fill_st_vector(gfc_symtree * st,gfc_symtree ** st_vec,unsigned node_cntr)4125 fill_st_vector (gfc_symtree *st, gfc_symtree **st_vec, unsigned node_cntr)
4126 {
4127 if (!st)
4128 return node_cntr;
4129
4130 node_cntr = fill_st_vector (st->left, st_vec, node_cntr);
4131 st_vec[node_cntr++] = st;
4132 node_cntr = fill_st_vector (st->right, st_vec, node_cntr);
4133
4134 return node_cntr;
4135 }
4136
4137
4138 /* Traverse namespace. As the functions might modify the symtree, we store the
4139 symtree as a vector and operate on this vector. Note: We assume that
4140 sym_func or st_func never deletes nodes from the symtree - only adding is
4141 allowed. Additionally, newly added nodes are not traversed. */
4142
4143 static void
do_traverse_symtree(gfc_symtree * st,void (* st_func)(gfc_symtree *),void (* sym_func)(gfc_symbol *))4144 do_traverse_symtree (gfc_symtree *st, void (*st_func) (gfc_symtree *),
4145 void (*sym_func) (gfc_symbol *))
4146 {
4147 gfc_symtree **st_vec;
4148 unsigned nodes, i, node_cntr;
4149
4150 gcc_assert ((st_func && !sym_func) || (!st_func && sym_func));
4151 nodes = count_st_nodes (st);
4152 st_vec = XALLOCAVEC (gfc_symtree *, nodes);
4153 node_cntr = 0;
4154 fill_st_vector (st, st_vec, node_cntr);
4155
4156 if (sym_func)
4157 {
4158 /* Clear marks. */
4159 for (i = 0; i < nodes; i++)
4160 st_vec[i]->n.sym->mark = 0;
4161 for (i = 0; i < nodes; i++)
4162 if (!st_vec[i]->n.sym->mark)
4163 {
4164 (*sym_func) (st_vec[i]->n.sym);
4165 st_vec[i]->n.sym->mark = 1;
4166 }
4167 }
4168 else
4169 for (i = 0; i < nodes; i++)
4170 (*st_func) (st_vec[i]);
4171 }
4172
4173
4174 /* Recursively traverse the symtree nodes. */
4175
4176 void
gfc_traverse_symtree(gfc_symtree * st,void (* st_func)(gfc_symtree *))4177 gfc_traverse_symtree (gfc_symtree *st, void (*st_func) (gfc_symtree *))
4178 {
4179 do_traverse_symtree (st, st_func, NULL);
4180 }
4181
4182
4183 /* Call a given function for all symbols in the namespace. We take
4184 care that each gfc_symbol node is called exactly once. */
4185
4186 void
gfc_traverse_ns(gfc_namespace * ns,void (* sym_func)(gfc_symbol *))4187 gfc_traverse_ns (gfc_namespace *ns, void (*sym_func) (gfc_symbol *))
4188 {
4189 do_traverse_symtree (ns->sym_root, NULL, sym_func);
4190 }
4191
4192
4193 /* Return TRUE when name is the name of an intrinsic type. */
4194
4195 bool
gfc_is_intrinsic_typename(const char * name)4196 gfc_is_intrinsic_typename (const char *name)
4197 {
4198 if (strcmp (name, "integer") == 0
4199 || strcmp (name, "real") == 0
4200 || strcmp (name, "character") == 0
4201 || strcmp (name, "logical") == 0
4202 || strcmp (name, "complex") == 0
4203 || strcmp (name, "doubleprecision") == 0
4204 || strcmp (name, "doublecomplex") == 0)
4205 return true;
4206 else
4207 return false;
4208 }
4209
4210
4211 /* Return TRUE if the symbol is an automatic variable. */
4212
4213 static bool
gfc_is_var_automatic(gfc_symbol * sym)4214 gfc_is_var_automatic (gfc_symbol *sym)
4215 {
4216 /* Pointer and allocatable variables are never automatic. */
4217 if (sym->attr.pointer || sym->attr.allocatable)
4218 return false;
4219 /* Check for arrays with non-constant size. */
4220 if (sym->attr.dimension && sym->as
4221 && !gfc_is_compile_time_shape (sym->as))
4222 return true;
4223 /* Check for non-constant length character variables. */
4224 if (sym->ts.type == BT_CHARACTER
4225 && sym->ts.u.cl
4226 && !gfc_is_constant_expr (sym->ts.u.cl->length))
4227 return true;
4228 /* Variables with explicit AUTOMATIC attribute. */
4229 if (sym->attr.automatic)
4230 return true;
4231
4232 return false;
4233 }
4234
4235 /* Given a symbol, mark it as SAVEd if it is allowed. */
4236
4237 static void
save_symbol(gfc_symbol * sym)4238 save_symbol (gfc_symbol *sym)
4239 {
4240
4241 if (sym->attr.use_assoc)
4242 return;
4243
4244 if (sym->attr.in_common
4245 || sym->attr.in_equivalence
4246 || sym->attr.dummy
4247 || sym->attr.result
4248 || sym->attr.flavor != FL_VARIABLE)
4249 return;
4250 /* Automatic objects are not saved. */
4251 if (gfc_is_var_automatic (sym))
4252 return;
4253 gfc_add_save (&sym->attr, SAVE_EXPLICIT, sym->name, &sym->declared_at);
4254 }
4255
4256
4257 /* Mark those symbols which can be SAVEd as such. */
4258
4259 void
gfc_save_all(gfc_namespace * ns)4260 gfc_save_all (gfc_namespace *ns)
4261 {
4262 gfc_traverse_ns (ns, save_symbol);
4263 }
4264
4265
4266 /* Make sure that no changes to symbols are pending. */
4267
4268 void
gfc_enforce_clean_symbol_state(void)4269 gfc_enforce_clean_symbol_state(void)
4270 {
4271 enforce_single_undo_checkpoint ();
4272 gcc_assert (latest_undo_chgset->syms.is_empty ());
4273 }
4274
4275
4276 /************** Global symbol handling ************/
4277
4278
4279 /* Search a tree for the global symbol. */
4280
4281 gfc_gsymbol *
gfc_find_gsymbol(gfc_gsymbol * symbol,const char * name)4282 gfc_find_gsymbol (gfc_gsymbol *symbol, const char *name)
4283 {
4284 int c;
4285
4286 if (symbol == NULL)
4287 return NULL;
4288
4289 while (symbol)
4290 {
4291 c = strcmp (name, symbol->name);
4292 if (!c)
4293 return symbol;
4294
4295 symbol = (c < 0) ? symbol->left : symbol->right;
4296 }
4297
4298 return NULL;
4299 }
4300
4301
4302 /* Case insensitive search a tree for the global symbol. */
4303
4304 gfc_gsymbol *
gfc_find_case_gsymbol(gfc_gsymbol * symbol,const char * name)4305 gfc_find_case_gsymbol (gfc_gsymbol *symbol, const char *name)
4306 {
4307 int c;
4308
4309 if (symbol == NULL)
4310 return NULL;
4311
4312 while (symbol)
4313 {
4314 c = strcasecmp (name, symbol->name);
4315 if (!c)
4316 return symbol;
4317
4318 symbol = (c < 0) ? symbol->left : symbol->right;
4319 }
4320
4321 return NULL;
4322 }
4323
4324
4325 /* Compare two global symbols. Used for managing the BB tree. */
4326
4327 static int
gsym_compare(void * _s1,void * _s2)4328 gsym_compare (void *_s1, void *_s2)
4329 {
4330 gfc_gsymbol *s1, *s2;
4331
4332 s1 = (gfc_gsymbol *) _s1;
4333 s2 = (gfc_gsymbol *) _s2;
4334 return strcmp (s1->name, s2->name);
4335 }
4336
4337
4338 /* Get a global symbol, creating it if it doesn't exist. */
4339
4340 gfc_gsymbol *
gfc_get_gsymbol(const char * name,bool bind_c)4341 gfc_get_gsymbol (const char *name, bool bind_c)
4342 {
4343 gfc_gsymbol *s;
4344
4345 s = gfc_find_gsymbol (gfc_gsym_root, name);
4346 if (s != NULL)
4347 return s;
4348
4349 s = XCNEW (gfc_gsymbol);
4350 s->type = GSYM_UNKNOWN;
4351 s->name = gfc_get_string ("%s", name);
4352 s->bind_c = bind_c;
4353
4354 gfc_insert_bbt (&gfc_gsym_root, s, gsym_compare);
4355
4356 return s;
4357 }
4358
4359 void
gfc_traverse_gsymbol(gfc_gsymbol * gsym,void (* do_something)(gfc_gsymbol *,void *),void * data)4360 gfc_traverse_gsymbol (gfc_gsymbol *gsym,
4361 void (*do_something) (gfc_gsymbol *, void *),
4362 void *data)
4363 {
4364 if (gsym->left)
4365 gfc_traverse_gsymbol (gsym->left, do_something, data);
4366
4367 (*do_something) (gsym, data);
4368
4369 if (gsym->right)
4370 gfc_traverse_gsymbol (gsym->right, do_something, data);
4371 }
4372
4373 static gfc_symbol *
get_iso_c_binding_dt(int sym_id)4374 get_iso_c_binding_dt (int sym_id)
4375 {
4376 gfc_symbol *dt_list = gfc_derived_types;
4377
4378 /* Loop through the derived types in the name list, searching for
4379 the desired symbol from iso_c_binding. Search the parent namespaces
4380 if necessary and requested to (parent_flag). */
4381 if (dt_list)
4382 {
4383 while (dt_list->dt_next != gfc_derived_types)
4384 {
4385 if (dt_list->from_intmod != INTMOD_NONE
4386 && dt_list->intmod_sym_id == sym_id)
4387 return dt_list;
4388
4389 dt_list = dt_list->dt_next;
4390 }
4391 }
4392
4393 return NULL;
4394 }
4395
4396
4397 /* Verifies that the given derived type symbol, derived_sym, is interoperable
4398 with C. This is necessary for any derived type that is BIND(C) and for
4399 derived types that are parameters to functions that are BIND(C). All
4400 fields of the derived type are required to be interoperable, and are tested
4401 for such. If an error occurs, the errors are reported here, allowing for
4402 multiple errors to be handled for a single derived type. */
4403
4404 bool
verify_bind_c_derived_type(gfc_symbol * derived_sym)4405 verify_bind_c_derived_type (gfc_symbol *derived_sym)
4406 {
4407 gfc_component *curr_comp = NULL;
4408 bool is_c_interop = false;
4409 bool retval = true;
4410
4411 if (derived_sym == NULL)
4412 gfc_internal_error ("verify_bind_c_derived_type(): Given symbol is "
4413 "unexpectedly NULL");
4414
4415 /* If we've already looked at this derived symbol, do not look at it again
4416 so we don't repeat warnings/errors. */
4417 if (derived_sym->ts.is_c_interop)
4418 return true;
4419
4420 /* The derived type must have the BIND attribute to be interoperable
4421 J3/04-007, Section 15.2.3. */
4422 if (derived_sym->attr.is_bind_c != 1)
4423 {
4424 derived_sym->ts.is_c_interop = 0;
4425 gfc_error_now ("Derived type %qs declared at %L must have the BIND "
4426 "attribute to be C interoperable", derived_sym->name,
4427 &(derived_sym->declared_at));
4428 retval = false;
4429 }
4430
4431 curr_comp = derived_sym->components;
4432
4433 /* Fortran 2003 allows an empty derived type. C99 appears to disallow an
4434 empty struct. Section 15.2 in Fortran 2003 states: "The following
4435 subclauses define the conditions under which a Fortran entity is
4436 interoperable. If a Fortran entity is interoperable, an equivalent
4437 entity may be defined by means of C and the Fortran entity is said
4438 to be interoperable with the C entity. There does not have to be such
4439 an interoperating C entity."
4440 */
4441 if (curr_comp == NULL)
4442 {
4443 gfc_warning (0, "Derived type %qs with BIND(C) attribute at %L is empty, "
4444 "and may be inaccessible by the C companion processor",
4445 derived_sym->name, &(derived_sym->declared_at));
4446 derived_sym->ts.is_c_interop = 1;
4447 derived_sym->attr.is_bind_c = 1;
4448 return true;
4449 }
4450
4451
4452 /* Initialize the derived type as being C interoperable.
4453 If we find an error in the components, this will be set false. */
4454 derived_sym->ts.is_c_interop = 1;
4455
4456 /* Loop through the list of components to verify that the kind of
4457 each is a C interoperable type. */
4458 do
4459 {
4460 /* The components cannot be pointers (fortran sense).
4461 J3/04-007, Section 15.2.3, C1505. */
4462 if (curr_comp->attr.pointer != 0)
4463 {
4464 gfc_error ("Component %qs at %L cannot have the "
4465 "POINTER attribute because it is a member "
4466 "of the BIND(C) derived type %qs at %L",
4467 curr_comp->name, &(curr_comp->loc),
4468 derived_sym->name, &(derived_sym->declared_at));
4469 retval = false;
4470 }
4471
4472 if (curr_comp->attr.proc_pointer != 0)
4473 {
4474 gfc_error ("Procedure pointer component %qs at %L cannot be a member"
4475 " of the BIND(C) derived type %qs at %L", curr_comp->name,
4476 &curr_comp->loc, derived_sym->name,
4477 &derived_sym->declared_at);
4478 retval = false;
4479 }
4480
4481 /* The components cannot be allocatable.
4482 J3/04-007, Section 15.2.3, C1505. */
4483 if (curr_comp->attr.allocatable != 0)
4484 {
4485 gfc_error ("Component %qs at %L cannot have the "
4486 "ALLOCATABLE attribute because it is a member "
4487 "of the BIND(C) derived type %qs at %L",
4488 curr_comp->name, &(curr_comp->loc),
4489 derived_sym->name, &(derived_sym->declared_at));
4490 retval = false;
4491 }
4492
4493 /* BIND(C) derived types must have interoperable components. */
4494 if (curr_comp->ts.type == BT_DERIVED
4495 && curr_comp->ts.u.derived->ts.is_iso_c != 1
4496 && curr_comp->ts.u.derived != derived_sym)
4497 {
4498 /* This should be allowed; the draft says a derived-type cannot
4499 have type parameters if it is has the BIND attribute. Type
4500 parameters seem to be for making parameterized derived types.
4501 There's no need to verify the type if it is c_ptr/c_funptr. */
4502 retval = verify_bind_c_derived_type (curr_comp->ts.u.derived);
4503 }
4504 else
4505 {
4506 /* Grab the typespec for the given component and test the kind. */
4507 is_c_interop = gfc_verify_c_interop (&(curr_comp->ts));
4508
4509 if (!is_c_interop)
4510 {
4511 /* Report warning and continue since not fatal. The
4512 draft does specify a constraint that requires all fields
4513 to interoperate, but if the user says real(4), etc., it
4514 may interoperate with *something* in C, but the compiler
4515 most likely won't know exactly what. Further, it may not
4516 interoperate with the same data type(s) in C if the user
4517 recompiles with different flags (e.g., -m32 and -m64 on
4518 x86_64 and using integer(4) to claim interop with a
4519 C_LONG). */
4520 if (derived_sym->attr.is_bind_c == 1 && warn_c_binding_type)
4521 /* If the derived type is bind(c), all fields must be
4522 interop. */
4523 gfc_warning (OPT_Wc_binding_type,
4524 "Component %qs in derived type %qs at %L "
4525 "may not be C interoperable, even though "
4526 "derived type %qs is BIND(C)",
4527 curr_comp->name, derived_sym->name,
4528 &(curr_comp->loc), derived_sym->name);
4529 else if (warn_c_binding_type)
4530 /* If derived type is param to bind(c) routine, or to one
4531 of the iso_c_binding procs, it must be interoperable, so
4532 all fields must interop too. */
4533 gfc_warning (OPT_Wc_binding_type,
4534 "Component %qs in derived type %qs at %L "
4535 "may not be C interoperable",
4536 curr_comp->name, derived_sym->name,
4537 &(curr_comp->loc));
4538 }
4539 }
4540
4541 curr_comp = curr_comp->next;
4542 } while (curr_comp != NULL);
4543
4544 if (derived_sym->attr.sequence != 0)
4545 {
4546 gfc_error ("Derived type %qs at %L cannot have the SEQUENCE "
4547 "attribute because it is BIND(C)", derived_sym->name,
4548 &(derived_sym->declared_at));
4549 retval = false;
4550 }
4551
4552 /* Mark the derived type as not being C interoperable if we found an
4553 error. If there were only warnings, proceed with the assumption
4554 it's interoperable. */
4555 if (!retval)
4556 derived_sym->ts.is_c_interop = 0;
4557
4558 return retval;
4559 }
4560
4561
4562 /* Generate symbols for the named constants c_null_ptr and c_null_funptr. */
4563
4564 static bool
gen_special_c_interop_ptr(gfc_symbol * tmp_sym,gfc_symtree * dt_symtree)4565 gen_special_c_interop_ptr (gfc_symbol *tmp_sym, gfc_symtree *dt_symtree)
4566 {
4567 gfc_constructor *c;
4568
4569 gcc_assert (tmp_sym && dt_symtree && dt_symtree->n.sym);
4570 dt_symtree->n.sym->attr.referenced = 1;
4571
4572 tmp_sym->attr.is_c_interop = 1;
4573 tmp_sym->attr.is_bind_c = 1;
4574 tmp_sym->ts.is_c_interop = 1;
4575 tmp_sym->ts.is_iso_c = 1;
4576 tmp_sym->ts.type = BT_DERIVED;
4577 tmp_sym->ts.f90_type = BT_VOID;
4578 tmp_sym->attr.flavor = FL_PARAMETER;
4579 tmp_sym->ts.u.derived = dt_symtree->n.sym;
4580
4581 /* Set the c_address field of c_null_ptr and c_null_funptr to
4582 the value of NULL. */
4583 tmp_sym->value = gfc_get_expr ();
4584 tmp_sym->value->expr_type = EXPR_STRUCTURE;
4585 tmp_sym->value->ts.type = BT_DERIVED;
4586 tmp_sym->value->ts.f90_type = BT_VOID;
4587 tmp_sym->value->ts.u.derived = tmp_sym->ts.u.derived;
4588 gfc_constructor_append_expr (&tmp_sym->value->value.constructor, NULL, NULL);
4589 c = gfc_constructor_first (tmp_sym->value->value.constructor);
4590 c->expr = gfc_get_int_expr (gfc_index_integer_kind, NULL, 0);
4591 c->expr->ts.is_iso_c = 1;
4592
4593 return true;
4594 }
4595
4596
4597 /* Add a formal argument, gfc_formal_arglist, to the
4598 end of the given list of arguments. Set the reference to the
4599 provided symbol, param_sym, in the argument. */
4600
4601 static void
add_formal_arg(gfc_formal_arglist ** head,gfc_formal_arglist ** tail,gfc_formal_arglist * formal_arg,gfc_symbol * param_sym)4602 add_formal_arg (gfc_formal_arglist **head,
4603 gfc_formal_arglist **tail,
4604 gfc_formal_arglist *formal_arg,
4605 gfc_symbol *param_sym)
4606 {
4607 /* Put in list, either as first arg or at the tail (curr arg). */
4608 if (*head == NULL)
4609 *head = *tail = formal_arg;
4610 else
4611 {
4612 (*tail)->next = formal_arg;
4613 (*tail) = formal_arg;
4614 }
4615
4616 (*tail)->sym = param_sym;
4617 (*tail)->next = NULL;
4618
4619 return;
4620 }
4621
4622
4623 /* Add a procedure interface to the given symbol (i.e., store a
4624 reference to the list of formal arguments). */
4625
4626 static void
add_proc_interface(gfc_symbol * sym,ifsrc source,gfc_formal_arglist * formal)4627 add_proc_interface (gfc_symbol *sym, ifsrc source, gfc_formal_arglist *formal)
4628 {
4629
4630 sym->formal = formal;
4631 sym->attr.if_source = source;
4632 }
4633
4634
4635 /* Copy the formal args from an existing symbol, src, into a new
4636 symbol, dest. New formal args are created, and the description of
4637 each arg is set according to the existing ones. This function is
4638 used when creating procedure declaration variables from a procedure
4639 declaration statement (see match_proc_decl()) to create the formal
4640 args based on the args of a given named interface.
4641
4642 When an actual argument list is provided, skip the absent arguments.
4643 To be used together with gfc_se->ignore_optional. */
4644
4645 void
gfc_copy_formal_args_intr(gfc_symbol * dest,gfc_intrinsic_sym * src,gfc_actual_arglist * actual)4646 gfc_copy_formal_args_intr (gfc_symbol *dest, gfc_intrinsic_sym *src,
4647 gfc_actual_arglist *actual)
4648 {
4649 gfc_formal_arglist *head = NULL;
4650 gfc_formal_arglist *tail = NULL;
4651 gfc_formal_arglist *formal_arg = NULL;
4652 gfc_intrinsic_arg *curr_arg = NULL;
4653 gfc_formal_arglist *formal_prev = NULL;
4654 gfc_actual_arglist *act_arg = actual;
4655 /* Save current namespace so we can change it for formal args. */
4656 gfc_namespace *parent_ns = gfc_current_ns;
4657
4658 /* Create a new namespace, which will be the formal ns (namespace
4659 of the formal args). */
4660 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4661 gfc_current_ns->proc_name = dest;
4662
4663 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4664 {
4665 /* Skip absent arguments. */
4666 if (actual)
4667 {
4668 gcc_assert (act_arg != NULL);
4669 if (act_arg->expr == NULL)
4670 {
4671 act_arg = act_arg->next;
4672 continue;
4673 }
4674 act_arg = act_arg->next;
4675 }
4676 formal_arg = gfc_get_formal_arglist ();
4677 gfc_get_symbol (curr_arg->name, gfc_current_ns, &(formal_arg->sym));
4678
4679 /* May need to copy more info for the symbol. */
4680 formal_arg->sym->ts = curr_arg->ts;
4681 formal_arg->sym->attr.optional = curr_arg->optional;
4682 formal_arg->sym->attr.value = curr_arg->value;
4683 formal_arg->sym->attr.intent = curr_arg->intent;
4684 formal_arg->sym->attr.flavor = FL_VARIABLE;
4685 formal_arg->sym->attr.dummy = 1;
4686
4687 if (formal_arg->sym->ts.type == BT_CHARACTER)
4688 formal_arg->sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4689
4690 /* If this isn't the first arg, set up the next ptr. For the
4691 last arg built, the formal_arg->next will never get set to
4692 anything other than NULL. */
4693 if (formal_prev != NULL)
4694 formal_prev->next = formal_arg;
4695 else
4696 formal_arg->next = NULL;
4697
4698 formal_prev = formal_arg;
4699
4700 /* Add arg to list of formal args. */
4701 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4702
4703 /* Validate changes. */
4704 gfc_commit_symbol (formal_arg->sym);
4705 }
4706
4707 /* Add the interface to the symbol. */
4708 add_proc_interface (dest, IFSRC_DECL, head);
4709
4710 /* Store the formal namespace information. */
4711 if (dest->formal != NULL)
4712 /* The current ns should be that for the dest proc. */
4713 dest->formal_ns = gfc_current_ns;
4714 /* Restore the current namespace to what it was on entry. */
4715 gfc_current_ns = parent_ns;
4716 }
4717
4718
4719 static int
std_for_isocbinding_symbol(int id)4720 std_for_isocbinding_symbol (int id)
4721 {
4722 switch (id)
4723 {
4724 #define NAMED_INTCST(a,b,c,d) \
4725 case a:\
4726 return d;
4727 #include "iso-c-binding.def"
4728 #undef NAMED_INTCST
4729
4730 #define NAMED_FUNCTION(a,b,c,d) \
4731 case a:\
4732 return d;
4733 #define NAMED_SUBROUTINE(a,b,c,d) \
4734 case a:\
4735 return d;
4736 #include "iso-c-binding.def"
4737 #undef NAMED_FUNCTION
4738 #undef NAMED_SUBROUTINE
4739
4740 default:
4741 return GFC_STD_F2003;
4742 }
4743 }
4744
4745 /* Generate the given set of C interoperable kind objects, or all
4746 interoperable kinds. This function will only be given kind objects
4747 for valid iso_c_binding defined types because this is verified when
4748 the 'use' statement is parsed. If the user gives an 'only' clause,
4749 the specific kinds are looked up; if they don't exist, an error is
4750 reported. If the user does not give an 'only' clause, all
4751 iso_c_binding symbols are generated. If a list of specific kinds
4752 is given, it must have a NULL in the first empty spot to mark the
4753 end of the list. For C_null_(fun)ptr, dt_symtree has to be set and
4754 point to the symtree for c_(fun)ptr. */
4755
4756 gfc_symtree *
generate_isocbinding_symbol(const char * mod_name,iso_c_binding_symbol s,const char * local_name,gfc_symtree * dt_symtree,bool hidden)4757 generate_isocbinding_symbol (const char *mod_name, iso_c_binding_symbol s,
4758 const char *local_name, gfc_symtree *dt_symtree,
4759 bool hidden)
4760 {
4761 const char *const name = (local_name && local_name[0])
4762 ? local_name : c_interop_kinds_table[s].name;
4763 gfc_symtree *tmp_symtree;
4764 gfc_symbol *tmp_sym = NULL;
4765 int index;
4766
4767 if (gfc_notification_std (std_for_isocbinding_symbol (s)) == ERROR)
4768 return NULL;
4769
4770 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, name);
4771 if (hidden
4772 && (!tmp_symtree || !tmp_symtree->n.sym
4773 || tmp_symtree->n.sym->from_intmod != INTMOD_ISO_C_BINDING
4774 || tmp_symtree->n.sym->intmod_sym_id != s))
4775 tmp_symtree = NULL;
4776
4777 /* Already exists in this scope so don't re-add it. */
4778 if (tmp_symtree != NULL && (tmp_sym = tmp_symtree->n.sym) != NULL
4779 && (!tmp_sym->attr.generic
4780 || (tmp_sym = gfc_find_dt_in_generic (tmp_sym)) != NULL)
4781 && tmp_sym->from_intmod == INTMOD_ISO_C_BINDING)
4782 {
4783 if (tmp_sym->attr.flavor == FL_DERIVED
4784 && !get_iso_c_binding_dt (tmp_sym->intmod_sym_id))
4785 {
4786 if (gfc_derived_types)
4787 {
4788 tmp_sym->dt_next = gfc_derived_types->dt_next;
4789 gfc_derived_types->dt_next = tmp_sym;
4790 }
4791 else
4792 {
4793 tmp_sym->dt_next = tmp_sym;
4794 }
4795 gfc_derived_types = tmp_sym;
4796 }
4797
4798 return tmp_symtree;
4799 }
4800
4801 /* Create the sym tree in the current ns. */
4802 if (hidden)
4803 {
4804 tmp_symtree = gfc_get_unique_symtree (gfc_current_ns);
4805 tmp_sym = gfc_new_symbol (name, gfc_current_ns);
4806
4807 /* Add to the list of tentative symbols. */
4808 latest_undo_chgset->syms.safe_push (tmp_sym);
4809 tmp_sym->old_symbol = NULL;
4810 tmp_sym->mark = 1;
4811 tmp_sym->gfc_new = 1;
4812
4813 tmp_symtree->n.sym = tmp_sym;
4814 tmp_sym->refs++;
4815 }
4816 else
4817 {
4818 gfc_get_sym_tree (name, gfc_current_ns, &tmp_symtree, false);
4819 gcc_assert (tmp_symtree);
4820 tmp_sym = tmp_symtree->n.sym;
4821 }
4822
4823 /* Say what module this symbol belongs to. */
4824 tmp_sym->module = gfc_get_string ("%s", mod_name);
4825 tmp_sym->from_intmod = INTMOD_ISO_C_BINDING;
4826 tmp_sym->intmod_sym_id = s;
4827 tmp_sym->attr.is_iso_c = 1;
4828 tmp_sym->attr.use_assoc = 1;
4829
4830 gcc_assert (dt_symtree == NULL || s == ISOCBINDING_NULL_FUNPTR
4831 || s == ISOCBINDING_NULL_PTR);
4832
4833 switch (s)
4834 {
4835
4836 #define NAMED_INTCST(a,b,c,d) case a :
4837 #define NAMED_REALCST(a,b,c,d) case a :
4838 #define NAMED_CMPXCST(a,b,c,d) case a :
4839 #define NAMED_LOGCST(a,b,c) case a :
4840 #define NAMED_CHARKNDCST(a,b,c) case a :
4841 #include "iso-c-binding.def"
4842
4843 tmp_sym->value = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4844 c_interop_kinds_table[s].value);
4845
4846 /* Initialize an integer constant expression node. */
4847 tmp_sym->attr.flavor = FL_PARAMETER;
4848 tmp_sym->ts.type = BT_INTEGER;
4849 tmp_sym->ts.kind = gfc_default_integer_kind;
4850
4851 /* Mark this type as a C interoperable one. */
4852 tmp_sym->ts.is_c_interop = 1;
4853 tmp_sym->ts.is_iso_c = 1;
4854 tmp_sym->value->ts.is_c_interop = 1;
4855 tmp_sym->value->ts.is_iso_c = 1;
4856 tmp_sym->attr.is_c_interop = 1;
4857
4858 /* Tell what f90 type this c interop kind is valid. */
4859 tmp_sym->ts.f90_type = c_interop_kinds_table[s].f90_type;
4860
4861 break;
4862
4863
4864 #define NAMED_CHARCST(a,b,c) case a :
4865 #include "iso-c-binding.def"
4866
4867 /* Initialize an integer constant expression node for the
4868 length of the character. */
4869 tmp_sym->value = gfc_get_character_expr (gfc_default_character_kind,
4870 &gfc_current_locus, NULL, 1);
4871 tmp_sym->value->ts.is_c_interop = 1;
4872 tmp_sym->value->ts.is_iso_c = 1;
4873 tmp_sym->value->value.character.length = 1;
4874 tmp_sym->value->value.character.string[0]
4875 = (gfc_char_t) c_interop_kinds_table[s].value;
4876 tmp_sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4877 tmp_sym->ts.u.cl->length = gfc_get_int_expr (gfc_charlen_int_kind,
4878 NULL, 1);
4879
4880 /* May not need this in both attr and ts, but do need in
4881 attr for writing module file. */
4882 tmp_sym->attr.is_c_interop = 1;
4883
4884 tmp_sym->attr.flavor = FL_PARAMETER;
4885 tmp_sym->ts.type = BT_CHARACTER;
4886
4887 /* Need to set it to the C_CHAR kind. */
4888 tmp_sym->ts.kind = gfc_default_character_kind;
4889
4890 /* Mark this type as a C interoperable one. */
4891 tmp_sym->ts.is_c_interop = 1;
4892 tmp_sym->ts.is_iso_c = 1;
4893
4894 /* Tell what f90 type this c interop kind is valid. */
4895 tmp_sym->ts.f90_type = BT_CHARACTER;
4896
4897 break;
4898
4899 case ISOCBINDING_PTR:
4900 case ISOCBINDING_FUNPTR:
4901 {
4902 gfc_symbol *dt_sym;
4903 gfc_component *tmp_comp = NULL;
4904
4905 /* Generate real derived type. */
4906 if (hidden)
4907 dt_sym = tmp_sym;
4908 else
4909 {
4910 const char *hidden_name;
4911 gfc_interface *intr, *head;
4912
4913 hidden_name = gfc_dt_upper_string (tmp_sym->name);
4914 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
4915 hidden_name);
4916 gcc_assert (tmp_symtree == NULL);
4917 gfc_get_sym_tree (hidden_name, gfc_current_ns, &tmp_symtree, false);
4918 dt_sym = tmp_symtree->n.sym;
4919 dt_sym->name = gfc_get_string (s == ISOCBINDING_PTR
4920 ? "c_ptr" : "c_funptr");
4921
4922 /* Generate an artificial generic function. */
4923 head = tmp_sym->generic;
4924 intr = gfc_get_interface ();
4925 intr->sym = dt_sym;
4926 intr->where = gfc_current_locus;
4927 intr->next = head;
4928 tmp_sym->generic = intr;
4929
4930 if (!tmp_sym->attr.generic
4931 && !gfc_add_generic (&tmp_sym->attr, tmp_sym->name, NULL))
4932 return NULL;
4933
4934 if (!tmp_sym->attr.function
4935 && !gfc_add_function (&tmp_sym->attr, tmp_sym->name, NULL))
4936 return NULL;
4937 }
4938
4939 /* Say what module this symbol belongs to. */
4940 dt_sym->module = gfc_get_string ("%s", mod_name);
4941 dt_sym->from_intmod = INTMOD_ISO_C_BINDING;
4942 dt_sym->intmod_sym_id = s;
4943 dt_sym->attr.use_assoc = 1;
4944
4945 /* Initialize an integer constant expression node. */
4946 dt_sym->attr.flavor = FL_DERIVED;
4947 dt_sym->ts.is_c_interop = 1;
4948 dt_sym->attr.is_c_interop = 1;
4949 dt_sym->attr.private_comp = 1;
4950 dt_sym->component_access = ACCESS_PRIVATE;
4951 dt_sym->ts.is_iso_c = 1;
4952 dt_sym->ts.type = BT_DERIVED;
4953 dt_sym->ts.f90_type = BT_VOID;
4954
4955 /* A derived type must have the bind attribute to be
4956 interoperable (J3/04-007, Section 15.2.3), even though
4957 the binding label is not used. */
4958 dt_sym->attr.is_bind_c = 1;
4959
4960 dt_sym->attr.referenced = 1;
4961 dt_sym->ts.u.derived = dt_sym;
4962
4963 /* Add the symbol created for the derived type to the current ns. */
4964 if (gfc_derived_types)
4965 {
4966 dt_sym->dt_next = gfc_derived_types->dt_next;
4967 gfc_derived_types->dt_next = dt_sym;
4968 }
4969 else
4970 {
4971 dt_sym->dt_next = dt_sym;
4972 }
4973 gfc_derived_types = dt_sym;
4974
4975 gfc_add_component (dt_sym, "c_address", &tmp_comp);
4976 if (tmp_comp == NULL)
4977 gcc_unreachable ();
4978
4979 tmp_comp->ts.type = BT_INTEGER;
4980
4981 /* Set this because the module will need to read/write this field. */
4982 tmp_comp->ts.f90_type = BT_INTEGER;
4983
4984 /* The kinds for c_ptr and c_funptr are the same. */
4985 index = get_c_kind ("c_ptr", c_interop_kinds_table);
4986 tmp_comp->ts.kind = c_interop_kinds_table[index].value;
4987 tmp_comp->attr.access = ACCESS_PRIVATE;
4988
4989 /* Mark the component as C interoperable. */
4990 tmp_comp->ts.is_c_interop = 1;
4991 }
4992
4993 break;
4994
4995 case ISOCBINDING_NULL_PTR:
4996 case ISOCBINDING_NULL_FUNPTR:
4997 gen_special_c_interop_ptr (tmp_sym, dt_symtree);
4998 break;
4999
5000 default:
5001 gcc_unreachable ();
5002 }
5003 gfc_commit_symbol (tmp_sym);
5004 return tmp_symtree;
5005 }
5006
5007
5008 /* Check that a symbol is already typed. If strict is not set, an untyped
5009 symbol is acceptable for non-standard-conforming mode. */
5010
5011 bool
gfc_check_symbol_typed(gfc_symbol * sym,gfc_namespace * ns,bool strict,locus where)5012 gfc_check_symbol_typed (gfc_symbol* sym, gfc_namespace* ns,
5013 bool strict, locus where)
5014 {
5015 gcc_assert (sym);
5016
5017 if (gfc_matching_prefix)
5018 return true;
5019
5020 /* Check for the type and try to give it an implicit one. */
5021 if (sym->ts.type == BT_UNKNOWN
5022 && !gfc_set_default_type (sym, 0, ns))
5023 {
5024 if (strict)
5025 {
5026 gfc_error ("Symbol %qs is used before it is typed at %L",
5027 sym->name, &where);
5028 return false;
5029 }
5030
5031 if (!gfc_notify_std (GFC_STD_GNU, "Symbol %qs is used before"
5032 " it is typed at %L", sym->name, &where))
5033 return false;
5034 }
5035
5036 /* Everything is ok. */
5037 return true;
5038 }
5039
5040
5041 /* Construct a typebound-procedure structure. Those are stored in a tentative
5042 list and marked `error' until symbols are committed. */
5043
5044 gfc_typebound_proc*
gfc_get_typebound_proc(gfc_typebound_proc * tb0)5045 gfc_get_typebound_proc (gfc_typebound_proc *tb0)
5046 {
5047 gfc_typebound_proc *result;
5048
5049 result = XCNEW (gfc_typebound_proc);
5050 if (tb0)
5051 *result = *tb0;
5052 result->error = 1;
5053
5054 latest_undo_chgset->tbps.safe_push (result);
5055
5056 return result;
5057 }
5058
5059
5060 /* Get the super-type of a given derived type. */
5061
5062 gfc_symbol*
gfc_get_derived_super_type(gfc_symbol * derived)5063 gfc_get_derived_super_type (gfc_symbol* derived)
5064 {
5065 gcc_assert (derived);
5066
5067 if (derived->attr.generic)
5068 derived = gfc_find_dt_in_generic (derived);
5069
5070 if (!derived->attr.extension)
5071 return NULL;
5072
5073 gcc_assert (derived->components);
5074 gcc_assert (derived->components->ts.type == BT_DERIVED);
5075 gcc_assert (derived->components->ts.u.derived);
5076
5077 if (derived->components->ts.u.derived->attr.generic)
5078 return gfc_find_dt_in_generic (derived->components->ts.u.derived);
5079
5080 return derived->components->ts.u.derived;
5081 }
5082
5083
5084 /* Get the ultimate super-type of a given derived type. */
5085
5086 gfc_symbol*
gfc_get_ultimate_derived_super_type(gfc_symbol * derived)5087 gfc_get_ultimate_derived_super_type (gfc_symbol* derived)
5088 {
5089 if (!derived->attr.extension)
5090 return NULL;
5091
5092 derived = gfc_get_derived_super_type (derived);
5093
5094 if (derived->attr.extension)
5095 return gfc_get_ultimate_derived_super_type (derived);
5096 else
5097 return derived;
5098 }
5099
5100
5101 /* Check if a derived type t2 is an extension of (or equal to) a type t1. */
5102
5103 bool
gfc_type_is_extension_of(gfc_symbol * t1,gfc_symbol * t2)5104 gfc_type_is_extension_of (gfc_symbol *t1, gfc_symbol *t2)
5105 {
5106 while (!gfc_compare_derived_types (t1, t2) && t2->attr.extension)
5107 t2 = gfc_get_derived_super_type (t2);
5108 return gfc_compare_derived_types (t1, t2);
5109 }
5110
5111
5112 /* Check if two typespecs are type compatible (F03:5.1.1.2):
5113 If ts1 is nonpolymorphic, ts2 must be the same type.
5114 If ts1 is polymorphic (CLASS), ts2 must be an extension of ts1. */
5115
5116 bool
gfc_type_compatible(gfc_typespec * ts1,gfc_typespec * ts2)5117 gfc_type_compatible (gfc_typespec *ts1, gfc_typespec *ts2)
5118 {
5119 bool is_class1 = (ts1->type == BT_CLASS);
5120 bool is_class2 = (ts2->type == BT_CLASS);
5121 bool is_derived1 = (ts1->type == BT_DERIVED);
5122 bool is_derived2 = (ts2->type == BT_DERIVED);
5123 bool is_union1 = (ts1->type == BT_UNION);
5124 bool is_union2 = (ts2->type == BT_UNION);
5125
5126 /* A boz-literal-constant has no type. */
5127 if (ts1->type == BT_BOZ || ts2->type == BT_BOZ)
5128 return false;
5129
5130 if (is_class1
5131 && ts1->u.derived->components
5132 && ((ts1->u.derived->attr.is_class
5133 && ts1->u.derived->components->ts.u.derived->attr
5134 .unlimited_polymorphic)
5135 || ts1->u.derived->attr.unlimited_polymorphic))
5136 return 1;
5137
5138 if (!is_derived1 && !is_derived2 && !is_class1 && !is_class2
5139 && !is_union1 && !is_union2)
5140 return (ts1->type == ts2->type);
5141
5142 if ((is_derived1 && is_derived2) || (is_union1 && is_union2))
5143 return gfc_compare_derived_types (ts1->u.derived, ts2->u.derived);
5144
5145 if (is_derived1 && is_class2)
5146 return gfc_compare_derived_types (ts1->u.derived,
5147 ts2->u.derived->attr.is_class ?
5148 ts2->u.derived->components->ts.u.derived
5149 : ts2->u.derived);
5150 if (is_class1 && is_derived2)
5151 return gfc_type_is_extension_of (ts1->u.derived->attr.is_class ?
5152 ts1->u.derived->components->ts.u.derived
5153 : ts1->u.derived,
5154 ts2->u.derived);
5155 else if (is_class1 && is_class2)
5156 return gfc_type_is_extension_of (ts1->u.derived->attr.is_class ?
5157 ts1->u.derived->components->ts.u.derived
5158 : ts1->u.derived,
5159 ts2->u.derived->attr.is_class ?
5160 ts2->u.derived->components->ts.u.derived
5161 : ts2->u.derived);
5162 else
5163 return 0;
5164 }
5165
5166
5167 /* Find the parent-namespace of the current function. If we're inside
5168 BLOCK constructs, it may not be the current one. */
5169
5170 gfc_namespace*
gfc_find_proc_namespace(gfc_namespace * ns)5171 gfc_find_proc_namespace (gfc_namespace* ns)
5172 {
5173 while (ns->construct_entities)
5174 {
5175 ns = ns->parent;
5176 gcc_assert (ns);
5177 }
5178
5179 return ns;
5180 }
5181
5182
5183 /* Check if an associate-variable should be translated as an `implicit' pointer
5184 internally (if it is associated to a variable and not an array with
5185 descriptor). */
5186
5187 bool
gfc_is_associate_pointer(gfc_symbol * sym)5188 gfc_is_associate_pointer (gfc_symbol* sym)
5189 {
5190 if (!sym->assoc)
5191 return false;
5192
5193 if (sym->ts.type == BT_CLASS)
5194 return true;
5195
5196 if (sym->ts.type == BT_CHARACTER
5197 && sym->ts.deferred
5198 && sym->assoc->target
5199 && sym->assoc->target->expr_type == EXPR_FUNCTION)
5200 return true;
5201
5202 if (!sym->assoc->variable)
5203 return false;
5204
5205 if (sym->attr.dimension && sym->as->type != AS_EXPLICIT)
5206 return false;
5207
5208 return true;
5209 }
5210
5211
5212 gfc_symbol *
gfc_find_dt_in_generic(gfc_symbol * sym)5213 gfc_find_dt_in_generic (gfc_symbol *sym)
5214 {
5215 gfc_interface *intr = NULL;
5216
5217 if (!sym || gfc_fl_struct (sym->attr.flavor))
5218 return sym;
5219
5220 if (sym->attr.generic)
5221 for (intr = sym->generic; intr; intr = intr->next)
5222 if (gfc_fl_struct (intr->sym->attr.flavor))
5223 break;
5224 return intr ? intr->sym : NULL;
5225 }
5226
5227
5228 /* Get the dummy arguments from a procedure symbol. If it has been declared
5229 via a PROCEDURE statement with a named interface, ts.interface will be set
5230 and the arguments need to be taken from there. */
5231
5232 gfc_formal_arglist *
gfc_sym_get_dummy_args(gfc_symbol * sym)5233 gfc_sym_get_dummy_args (gfc_symbol *sym)
5234 {
5235 gfc_formal_arglist *dummies;
5236
5237 dummies = sym->formal;
5238 if (dummies == NULL && sym->ts.interface != NULL)
5239 dummies = sym->ts.interface->formal;
5240
5241 return dummies;
5242 }
5243