1 /* Maintain binary trees of symbols.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
31 /* Strings for all symbol attributes. We use these for dumping the
32 parse tree, in error messages, and also when reading and writing
35 const mstring flavors[] =
37 minit ("UNKNOWN-FL", FL_UNKNOWN), minit ("PROGRAM", FL_PROGRAM),
38 minit ("BLOCK-DATA", FL_BLOCK_DATA), minit ("MODULE", FL_MODULE),
39 minit ("VARIABLE", FL_VARIABLE), minit ("PARAMETER", FL_PARAMETER),
40 minit ("LABEL", FL_LABEL), minit ("PROCEDURE", FL_PROCEDURE),
41 minit ("DERIVED", FL_DERIVED), minit ("NAMELIST", FL_NAMELIST),
45 const mstring procedures[] =
47 minit ("UNKNOWN-PROC", PROC_UNKNOWN),
48 minit ("MODULE-PROC", PROC_MODULE),
49 minit ("INTERNAL-PROC", PROC_INTERNAL),
50 minit ("DUMMY-PROC", PROC_DUMMY),
51 minit ("INTRINSIC-PROC", PROC_INTRINSIC),
52 minit ("EXTERNAL-PROC", PROC_EXTERNAL),
53 minit ("STATEMENT-PROC", PROC_ST_FUNCTION),
57 const mstring intents[] =
59 minit ("UNKNOWN-INTENT", INTENT_UNKNOWN),
60 minit ("IN", INTENT_IN),
61 minit ("OUT", INTENT_OUT),
62 minit ("INOUT", INTENT_INOUT),
66 const mstring access_types[] =
68 minit ("UNKNOWN-ACCESS", ACCESS_UNKNOWN),
69 minit ("PUBLIC", ACCESS_PUBLIC),
70 minit ("PRIVATE", ACCESS_PRIVATE),
74 const mstring ifsrc_types[] =
76 minit ("UNKNOWN", IFSRC_UNKNOWN),
77 minit ("DECL", IFSRC_DECL),
78 minit ("BODY", IFSRC_IFBODY)
81 const mstring save_status[] =
83 minit ("UNKNOWN", SAVE_NONE),
84 minit ("EXPLICIT-SAVE", SAVE_EXPLICIT),
85 minit ("IMPLICIT-SAVE", SAVE_IMPLICIT),
88 /* This is to make sure the backend generates setup code in the correct
91 static int next_dummy_order = 1;
94 gfc_namespace *gfc_current_ns;
95 gfc_namespace *gfc_global_ns_list;
97 gfc_gsymbol *gfc_gsym_root = NULL;
99 static gfc_symbol *changed_syms = NULL;
101 gfc_dt_list *gfc_derived_types;
104 /* List of tentative typebound-procedures. */
106 typedef struct tentative_tbp
108 gfc_typebound_proc *proc;
109 struct tentative_tbp *next;
113 static tentative_tbp *tentative_tbp_list = NULL;
116 /*********** IMPLICIT NONE and IMPLICIT statement handlers ***********/
118 /* The following static variable indicates whether a particular element has
119 been explicitly set or not. */
121 static int new_flag[GFC_LETTERS];
124 /* Handle a correctly parsed IMPLICIT NONE. */
127 gfc_set_implicit_none (void)
131 if (gfc_current_ns->seen_implicit_none)
133 gfc_error ("Duplicate IMPLICIT NONE statement at %C");
137 gfc_current_ns->seen_implicit_none = 1;
139 for (i = 0; i < GFC_LETTERS; i++)
141 gfc_clear_ts (&gfc_current_ns->default_type[i]);
142 gfc_current_ns->set_flag[i] = 1;
147 /* Reset the implicit range flags. */
150 gfc_clear_new_implicit (void)
154 for (i = 0; i < GFC_LETTERS; i++)
159 /* Prepare for a new implicit range. Sets flags in new_flag[]. */
162 gfc_add_new_implicit_range (int c1, int c2)
169 for (i = c1; i <= c2; i++)
173 gfc_error ("Letter '%c' already set in IMPLICIT statement at %C",
185 /* Add a matched implicit range for gfc_set_implicit(). Check if merging
186 the new implicit types back into the existing types will work. */
189 gfc_merge_new_implicit (gfc_typespec *ts)
193 if (gfc_current_ns->seen_implicit_none)
195 gfc_error ("Cannot specify IMPLICIT at %C after IMPLICIT NONE");
199 for (i = 0; i < GFC_LETTERS; i++)
203 if (gfc_current_ns->set_flag[i])
205 gfc_error ("Letter %c already has an IMPLICIT type at %C",
210 gfc_current_ns->default_type[i] = *ts;
211 gfc_current_ns->implicit_loc[i] = gfc_current_locus;
212 gfc_current_ns->set_flag[i] = 1;
219 /* Given a symbol, return a pointer to the typespec for its default type. */
222 gfc_get_default_type (const char *name, gfc_namespace *ns)
228 if (gfc_option.flag_allow_leading_underscore && letter == '_')
229 gfc_internal_error ("Option -fallow-leading-underscore is for use only by "
230 "gfortran developers, and should not be used for "
231 "implicitly typed variables");
233 if (letter < 'a' || letter > 'z')
234 gfc_internal_error ("gfc_get_default_type(): Bad symbol '%s'", name);
239 return &ns->default_type[letter - 'a'];
243 /* Given a pointer to a symbol, set its type according to the first
244 letter of its name. Fails if the letter in question has no default
248 gfc_set_default_type (gfc_symbol *sym, int error_flag, gfc_namespace *ns)
252 if (sym->ts.type != BT_UNKNOWN)
253 gfc_internal_error ("gfc_set_default_type(): symbol already has a type");
255 ts = gfc_get_default_type (sym->name, ns);
257 if (ts->type == BT_UNKNOWN)
259 if (error_flag && !sym->attr.untyped)
261 gfc_error ("Symbol '%s' at %L has no IMPLICIT type",
262 sym->name, &sym->declared_at);
263 sym->attr.untyped = 1; /* Ensure we only give an error once. */
270 sym->attr.implicit_type = 1;
272 if (ts->type == BT_CHARACTER && ts->u.cl)
273 sym->ts.u.cl = gfc_new_charlen (sym->ns, ts->u.cl);
275 if (sym->attr.is_bind_c == 1)
277 /* BIND(C) variables should not be implicitly declared. */
278 gfc_warning_now ("Implicitly declared BIND(C) variable '%s' at %L may "
279 "not be C interoperable", sym->name, &sym->declared_at);
280 sym->ts.f90_type = sym->ts.type;
283 if (sym->attr.dummy != 0)
285 if (sym->ns->proc_name != NULL
286 && (sym->ns->proc_name->attr.subroutine != 0
287 || sym->ns->proc_name->attr.function != 0)
288 && sym->ns->proc_name->attr.is_bind_c != 0)
290 /* Dummy args to a BIND(C) routine may not be interoperable if
291 they are implicitly typed. */
292 gfc_warning_now ("Implicitly declared variable '%s' at %L may not "
293 "be C interoperable but it is a dummy argument to "
294 "the BIND(C) procedure '%s' at %L", sym->name,
295 &(sym->declared_at), sym->ns->proc_name->name,
296 &(sym->ns->proc_name->declared_at));
297 sym->ts.f90_type = sym->ts.type;
305 /* This function is called from parse.c(parse_progunit) to check the
306 type of the function is not implicitly typed in the host namespace
307 and to implicitly type the function result, if necessary. */
310 gfc_check_function_type (gfc_namespace *ns)
312 gfc_symbol *proc = ns->proc_name;
314 if (!proc->attr.contained || proc->result->attr.implicit_type)
317 if (proc->result->ts.type == BT_UNKNOWN && proc->result->ts.interface == NULL)
319 if (gfc_set_default_type (proc->result, 0, gfc_current_ns)
322 if (proc->result != proc)
324 proc->ts = proc->result->ts;
325 proc->as = gfc_copy_array_spec (proc->result->as);
326 proc->attr.dimension = proc->result->attr.dimension;
327 proc->attr.pointer = proc->result->attr.pointer;
328 proc->attr.allocatable = proc->result->attr.allocatable;
331 else if (!proc->result->attr.proc_pointer)
333 gfc_error ("Function result '%s' at %L has no IMPLICIT type",
334 proc->result->name, &proc->result->declared_at);
335 proc->result->attr.untyped = 1;
341 /******************** Symbol attribute stuff *********************/
343 /* This is a generic conflict-checker. We do this to avoid having a
344 single conflict in two places. */
346 #define conf(a, b) if (attr->a && attr->b) { a1 = a; a2 = b; goto conflict; }
347 #define conf2(a) if (attr->a) { a2 = a; goto conflict; }
348 #define conf_std(a, b, std) if (attr->a && attr->b)\
357 check_conflict (symbol_attribute *attr, const char *name, locus *where)
359 static const char *dummy = "DUMMY", *save = "SAVE", *pointer = "POINTER",
360 *target = "TARGET", *external = "EXTERNAL", *intent = "INTENT",
361 *intent_in = "INTENT(IN)", *intrinsic = "INTRINSIC",
362 *intent_out = "INTENT(OUT)", *intent_inout = "INTENT(INOUT)",
363 *allocatable = "ALLOCATABLE", *elemental = "ELEMENTAL",
364 *privat = "PRIVATE", *recursive = "RECURSIVE",
365 *in_common = "COMMON", *result = "RESULT", *in_namelist = "NAMELIST",
366 *publik = "PUBLIC", *optional = "OPTIONAL", *entry = "ENTRY",
367 *function = "FUNCTION", *subroutine = "SUBROUTINE",
368 *dimension = "DIMENSION", *in_equivalence = "EQUIVALENCE",
369 *use_assoc = "USE ASSOCIATED", *cray_pointer = "CRAY POINTER",
370 *cray_pointee = "CRAY POINTEE", *data = "DATA", *value = "VALUE",
371 *volatile_ = "VOLATILE", *is_protected = "PROTECTED",
372 *is_bind_c = "BIND(C)", *procedure = "PROCEDURE";
373 static const char *threadprivate = "THREADPRIVATE";
379 where = &gfc_current_locus;
381 if (attr->pointer && attr->intent != INTENT_UNKNOWN)
385 standard = GFC_STD_F2003;
389 /* Check for attributes not allowed in a BLOCK DATA. */
390 if (gfc_current_state () == COMP_BLOCK_DATA)
394 if (attr->in_namelist)
396 if (attr->allocatable)
402 if (attr->access == ACCESS_PRIVATE)
404 if (attr->access == ACCESS_PUBLIC)
406 if (attr->intent != INTENT_UNKNOWN)
412 ("%s attribute not allowed in BLOCK DATA program unit at %L",
418 if (attr->save == SAVE_EXPLICIT)
421 conf (in_common, save);
424 switch (attr->flavor)
432 a1 = gfc_code2string (flavors, attr->flavor);
437 /* Conflicts between SAVE and PROCEDURE will be checked at
438 resolution stage, see "resolve_fl_procedure". */
447 conf (dummy, intrinsic);
448 conf (dummy, threadprivate);
449 conf (pointer, target);
450 conf (pointer, intrinsic);
451 conf (pointer, elemental);
452 conf (allocatable, elemental);
454 conf (target, external);
455 conf (target, intrinsic);
457 if (!attr->if_source)
458 conf (external, dimension); /* See Fortran 95's R504. */
460 conf (external, intrinsic);
461 conf (entry, intrinsic);
463 if ((attr->if_source == IFSRC_DECL && !attr->procedure) || attr->contained)
464 conf (external, subroutine);
466 if (attr->proc_pointer && gfc_notify_std (GFC_STD_F2003,
467 "Fortran 2003: Procedure pointer at %C") == FAILURE)
470 conf (allocatable, pointer);
471 conf_std (allocatable, dummy, GFC_STD_F2003);
472 conf_std (allocatable, function, GFC_STD_F2003);
473 conf_std (allocatable, result, GFC_STD_F2003);
474 conf (elemental, recursive);
476 conf (in_common, dummy);
477 conf (in_common, allocatable);
478 conf (in_common, result);
480 conf (dummy, result);
482 conf (in_equivalence, use_assoc);
483 conf (in_equivalence, dummy);
484 conf (in_equivalence, target);
485 conf (in_equivalence, pointer);
486 conf (in_equivalence, function);
487 conf (in_equivalence, result);
488 conf (in_equivalence, entry);
489 conf (in_equivalence, allocatable);
490 conf (in_equivalence, threadprivate);
492 conf (in_namelist, pointer);
493 conf (in_namelist, allocatable);
495 conf (entry, result);
497 conf (function, subroutine);
499 if (!function && !subroutine)
500 conf (is_bind_c, dummy);
502 conf (is_bind_c, cray_pointer);
503 conf (is_bind_c, cray_pointee);
504 conf (is_bind_c, allocatable);
505 conf (is_bind_c, elemental);
507 /* Need to also get volatile attr, according to 5.1 of F2003 draft.
508 Parameter conflict caught below. Also, value cannot be specified
509 for a dummy procedure. */
511 /* Cray pointer/pointee conflicts. */
512 conf (cray_pointer, cray_pointee);
513 conf (cray_pointer, dimension);
514 conf (cray_pointer, pointer);
515 conf (cray_pointer, target);
516 conf (cray_pointer, allocatable);
517 conf (cray_pointer, external);
518 conf (cray_pointer, intrinsic);
519 conf (cray_pointer, in_namelist);
520 conf (cray_pointer, function);
521 conf (cray_pointer, subroutine);
522 conf (cray_pointer, entry);
524 conf (cray_pointee, allocatable);
525 conf (cray_pointee, intent);
526 conf (cray_pointee, optional);
527 conf (cray_pointee, dummy);
528 conf (cray_pointee, target);
529 conf (cray_pointee, intrinsic);
530 conf (cray_pointee, pointer);
531 conf (cray_pointee, entry);
532 conf (cray_pointee, in_common);
533 conf (cray_pointee, in_equivalence);
534 conf (cray_pointee, threadprivate);
537 conf (data, function);
539 conf (data, allocatable);
540 conf (data, use_assoc);
542 conf (value, pointer)
543 conf (value, allocatable)
544 conf (value, subroutine)
545 conf (value, function)
546 conf (value, volatile_)
547 conf (value, dimension)
548 conf (value, external)
551 && (attr->intent == INTENT_OUT || attr->intent == INTENT_INOUT))
554 a2 = attr->intent == INTENT_OUT ? intent_out : intent_inout;
558 conf (is_protected, intrinsic)
559 conf (is_protected, external)
560 conf (is_protected, in_common)
562 conf (volatile_, intrinsic)
563 conf (volatile_, external)
565 if (attr->volatile_ && attr->intent == INTENT_IN)
572 conf (procedure, allocatable)
573 conf (procedure, dimension)
574 conf (procedure, intrinsic)
575 conf (procedure, is_protected)
576 conf (procedure, target)
577 conf (procedure, value)
578 conf (procedure, volatile_)
579 conf (procedure, entry)
581 a1 = gfc_code2string (flavors, attr->flavor);
583 if (attr->in_namelist
584 && attr->flavor != FL_VARIABLE
585 && attr->flavor != FL_PROCEDURE
586 && attr->flavor != FL_UNKNOWN)
592 switch (attr->flavor)
602 conf2 (is_protected);
612 conf2 (threadprivate);
614 if (attr->access == ACCESS_PUBLIC || attr->access == ACCESS_PRIVATE)
616 a2 = attr->access == ACCESS_PUBLIC ? publik : privat;
617 gfc_error ("%s attribute applied to %s %s at %L", a2, a1,
624 gfc_error_now ("BIND(C) applied to %s %s at %L", a1, name, where);
638 /* Conflicts with INTENT, SAVE and RESULT will be checked
639 at resolution stage, see "resolve_fl_procedure". */
641 if (attr->subroutine)
648 conf2 (threadprivate);
651 if (!attr->proc_pointer)
656 case PROC_ST_FUNCTION:
666 conf2 (threadprivate);
686 conf2 (threadprivate);
689 if (attr->intent != INTENT_UNKNOWN)
705 conf2 (is_protected);
711 conf2 (threadprivate);
725 gfc_error ("%s attribute conflicts with %s attribute at %L",
728 gfc_error ("%s attribute conflicts with %s attribute in '%s' at %L",
729 a1, a2, name, where);
736 return gfc_notify_std (standard, "Fortran 2003: %s attribute "
737 "with %s attribute at %L", a1, a2,
742 return gfc_notify_std (standard, "Fortran 2003: %s attribute "
743 "with %s attribute in '%s' at %L",
744 a1, a2, name, where);
753 /* Mark a symbol as referenced. */
756 gfc_set_sym_referenced (gfc_symbol *sym)
759 if (sym->attr.referenced)
762 sym->attr.referenced = 1;
764 /* Remember which order dummy variables are accessed in. */
766 sym->dummy_order = next_dummy_order++;
770 /* Common subroutine called by attribute changing subroutines in order
771 to prevent them from changing a symbol that has been
772 use-associated. Returns zero if it is OK to change the symbol,
776 check_used (symbol_attribute *attr, const char *name, locus *where)
779 if (attr->use_assoc == 0)
783 where = &gfc_current_locus;
786 gfc_error ("Cannot change attributes of USE-associated symbol at %L",
789 gfc_error ("Cannot change attributes of USE-associated symbol %s at %L",
796 /* Generate an error because of a duplicate attribute. */
799 duplicate_attr (const char *attr, locus *where)
803 where = &gfc_current_locus;
805 gfc_error ("Duplicate %s attribute specified at %L", attr, where);
810 gfc_add_ext_attribute (symbol_attribute *attr, ext_attr_id_t ext_attr,
811 locus *where ATTRIBUTE_UNUSED)
813 attr->ext_attr |= 1 << ext_attr;
818 /* Called from decl.c (attr_decl1) to check attributes, when declared
822 gfc_add_attribute (symbol_attribute *attr, locus *where)
824 if (check_used (attr, NULL, where))
827 return check_conflict (attr, NULL, where);
832 gfc_add_allocatable (symbol_attribute *attr, locus *where)
835 if (check_used (attr, NULL, where))
838 if (attr->allocatable)
840 duplicate_attr ("ALLOCATABLE", where);
844 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
845 && gfc_find_state (COMP_INTERFACE) == FAILURE)
847 gfc_error ("ALLOCATABLE specified outside of INTERFACE body at %L",
852 attr->allocatable = 1;
853 return check_conflict (attr, NULL, where);
858 gfc_add_dimension (symbol_attribute *attr, const char *name, locus *where)
861 if (check_used (attr, name, where))
866 duplicate_attr ("DIMENSION", where);
870 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
871 && gfc_find_state (COMP_INTERFACE) == FAILURE)
873 gfc_error ("DIMENSION specified for '%s' outside its INTERFACE body "
874 "at %L", name, where);
879 return check_conflict (attr, name, where);
884 gfc_add_external (symbol_attribute *attr, locus *where)
887 if (check_used (attr, NULL, where))
892 duplicate_attr ("EXTERNAL", where);
896 if (attr->pointer && attr->if_source != IFSRC_IFBODY)
899 attr->proc_pointer = 1;
904 return check_conflict (attr, NULL, where);
909 gfc_add_intrinsic (symbol_attribute *attr, locus *where)
912 if (check_used (attr, NULL, where))
917 duplicate_attr ("INTRINSIC", where);
923 return check_conflict (attr, NULL, where);
928 gfc_add_optional (symbol_attribute *attr, locus *where)
931 if (check_used (attr, NULL, where))
936 duplicate_attr ("OPTIONAL", where);
941 return check_conflict (attr, NULL, where);
946 gfc_add_pointer (symbol_attribute *attr, locus *where)
949 if (check_used (attr, NULL, where))
952 if (attr->pointer && !(attr->if_source == IFSRC_IFBODY
953 && gfc_find_state (COMP_INTERFACE) == FAILURE))
955 duplicate_attr ("POINTER", where);
959 if (attr->procedure || (attr->external && attr->if_source != IFSRC_IFBODY)
960 || (attr->if_source == IFSRC_IFBODY
961 && gfc_find_state (COMP_INTERFACE) == FAILURE))
962 attr->proc_pointer = 1;
966 return check_conflict (attr, NULL, where);
971 gfc_add_cray_pointer (symbol_attribute *attr, locus *where)
974 if (check_used (attr, NULL, where))
977 attr->cray_pointer = 1;
978 return check_conflict (attr, NULL, where);
983 gfc_add_cray_pointee (symbol_attribute *attr, locus *where)
986 if (check_used (attr, NULL, where))
989 if (attr->cray_pointee)
991 gfc_error ("Cray Pointee at %L appears in multiple pointer()"
992 " statements", where);
996 attr->cray_pointee = 1;
997 return check_conflict (attr, NULL, where);
1002 gfc_add_protected (symbol_attribute *attr, const char *name, locus *where)
1004 if (check_used (attr, name, where))
1007 if (attr->is_protected)
1009 if (gfc_notify_std (GFC_STD_LEGACY,
1010 "Duplicate PROTECTED attribute specified at %L",
1016 attr->is_protected = 1;
1017 return check_conflict (attr, name, where);
1022 gfc_add_result (symbol_attribute *attr, const char *name, locus *where)
1025 if (check_used (attr, name, where))
1029 return check_conflict (attr, name, where);
1034 gfc_add_save (symbol_attribute *attr, const char *name, locus *where)
1037 if (check_used (attr, name, where))
1040 if (gfc_pure (NULL))
1043 ("SAVE attribute at %L cannot be specified in a PURE procedure",
1048 if (attr->save == SAVE_EXPLICIT)
1050 if (gfc_notify_std (GFC_STD_LEGACY,
1051 "Duplicate SAVE attribute specified at %L",
1057 attr->save = SAVE_EXPLICIT;
1058 return check_conflict (attr, name, where);
1063 gfc_add_value (symbol_attribute *attr, const char *name, locus *where)
1066 if (check_used (attr, name, where))
1071 if (gfc_notify_std (GFC_STD_LEGACY,
1072 "Duplicate VALUE attribute specified at %L",
1079 return check_conflict (attr, name, where);
1084 gfc_add_volatile (symbol_attribute *attr, const char *name, locus *where)
1086 /* No check_used needed as 11.2.1 of the F2003 standard allows
1087 that the local identifier made accessible by a use statement can be
1088 given a VOLATILE attribute. */
1090 if (attr->volatile_ && attr->volatile_ns == gfc_current_ns)
1091 if (gfc_notify_std (GFC_STD_LEGACY,
1092 "Duplicate VOLATILE attribute specified at %L", where)
1096 attr->volatile_ = 1;
1097 attr->volatile_ns = gfc_current_ns;
1098 return check_conflict (attr, name, where);
1103 gfc_add_threadprivate (symbol_attribute *attr, const char *name, locus *where)
1106 if (check_used (attr, name, where))
1109 if (attr->threadprivate)
1111 duplicate_attr ("THREADPRIVATE", where);
1115 attr->threadprivate = 1;
1116 return check_conflict (attr, name, where);
1121 gfc_add_target (symbol_attribute *attr, locus *where)
1124 if (check_used (attr, NULL, where))
1129 duplicate_attr ("TARGET", where);
1134 return check_conflict (attr, NULL, where);
1139 gfc_add_dummy (symbol_attribute *attr, const char *name, locus *where)
1142 if (check_used (attr, name, where))
1145 /* Duplicate dummy arguments are allowed due to ENTRY statements. */
1147 return check_conflict (attr, name, where);
1152 gfc_add_in_common (symbol_attribute *attr, const char *name, locus *where)
1155 if (check_used (attr, name, where))
1158 /* Duplicate attribute already checked for. */
1159 attr->in_common = 1;
1160 return check_conflict (attr, name, where);
1165 gfc_add_in_equivalence (symbol_attribute *attr, const char *name, locus *where)
1168 /* Duplicate attribute already checked for. */
1169 attr->in_equivalence = 1;
1170 if (check_conflict (attr, name, where) == FAILURE)
1173 if (attr->flavor == FL_VARIABLE)
1176 return gfc_add_flavor (attr, FL_VARIABLE, name, where);
1181 gfc_add_data (symbol_attribute *attr, const char *name, locus *where)
1184 if (check_used (attr, name, where))
1188 return check_conflict (attr, name, where);
1193 gfc_add_in_namelist (symbol_attribute *attr, const char *name, locus *where)
1196 attr->in_namelist = 1;
1197 return check_conflict (attr, name, where);
1202 gfc_add_sequence (symbol_attribute *attr, const char *name, locus *where)
1205 if (check_used (attr, name, where))
1209 return check_conflict (attr, name, where);
1214 gfc_add_elemental (symbol_attribute *attr, locus *where)
1217 if (check_used (attr, NULL, where))
1220 if (attr->elemental)
1222 duplicate_attr ("ELEMENTAL", where);
1226 attr->elemental = 1;
1227 return check_conflict (attr, NULL, where);
1232 gfc_add_pure (symbol_attribute *attr, locus *where)
1235 if (check_used (attr, NULL, where))
1240 duplicate_attr ("PURE", where);
1245 return check_conflict (attr, NULL, where);
1250 gfc_add_recursive (symbol_attribute *attr, locus *where)
1253 if (check_used (attr, NULL, where))
1256 if (attr->recursive)
1258 duplicate_attr ("RECURSIVE", where);
1262 attr->recursive = 1;
1263 return check_conflict (attr, NULL, where);
1268 gfc_add_entry (symbol_attribute *attr, const char *name, locus *where)
1271 if (check_used (attr, name, where))
1276 duplicate_attr ("ENTRY", where);
1281 return check_conflict (attr, name, where);
1286 gfc_add_function (symbol_attribute *attr, const char *name, locus *where)
1289 if (attr->flavor != FL_PROCEDURE
1290 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1294 return check_conflict (attr, name, where);
1299 gfc_add_subroutine (symbol_attribute *attr, const char *name, locus *where)
1302 if (attr->flavor != FL_PROCEDURE
1303 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1306 attr->subroutine = 1;
1307 return check_conflict (attr, name, where);
1312 gfc_add_generic (symbol_attribute *attr, const char *name, locus *where)
1315 if (attr->flavor != FL_PROCEDURE
1316 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1320 return check_conflict (attr, name, where);
1325 gfc_add_proc (symbol_attribute *attr, const char *name, locus *where)
1328 if (check_used (attr, NULL, where))
1331 if (attr->flavor != FL_PROCEDURE
1332 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1335 if (attr->procedure)
1337 duplicate_attr ("PROCEDURE", where);
1341 attr->procedure = 1;
1343 return check_conflict (attr, NULL, where);
1348 gfc_add_abstract (symbol_attribute* attr, locus* where)
1352 duplicate_attr ("ABSTRACT", where);
1361 /* Flavors are special because some flavors are not what Fortran
1362 considers attributes and can be reaffirmed multiple times. */
1365 gfc_add_flavor (symbol_attribute *attr, sym_flavor f, const char *name,
1369 if ((f == FL_PROGRAM || f == FL_BLOCK_DATA || f == FL_MODULE
1370 || f == FL_PARAMETER || f == FL_LABEL || f == FL_DERIVED
1371 || f == FL_NAMELIST) && check_used (attr, name, where))
1374 if (attr->flavor == f && f == FL_VARIABLE)
1377 if (attr->flavor != FL_UNKNOWN)
1380 where = &gfc_current_locus;
1383 gfc_error ("%s attribute of '%s' conflicts with %s attribute at %L",
1384 gfc_code2string (flavors, attr->flavor), name,
1385 gfc_code2string (flavors, f), where);
1387 gfc_error ("%s attribute conflicts with %s attribute at %L",
1388 gfc_code2string (flavors, attr->flavor),
1389 gfc_code2string (flavors, f), where);
1396 return check_conflict (attr, name, where);
1401 gfc_add_procedure (symbol_attribute *attr, procedure_type t,
1402 const char *name, locus *where)
1405 if (check_used (attr, name, where))
1408 if (attr->flavor != FL_PROCEDURE
1409 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1413 where = &gfc_current_locus;
1415 if (attr->proc != PROC_UNKNOWN)
1417 gfc_error ("%s procedure at %L is already declared as %s procedure",
1418 gfc_code2string (procedures, t), where,
1419 gfc_code2string (procedures, attr->proc));
1426 /* Statement functions are always scalar and functions. */
1427 if (t == PROC_ST_FUNCTION
1428 && ((!attr->function && gfc_add_function (attr, name, where) == FAILURE)
1429 || attr->dimension))
1432 return check_conflict (attr, name, where);
1437 gfc_add_intent (symbol_attribute *attr, sym_intent intent, locus *where)
1440 if (check_used (attr, NULL, where))
1443 if (attr->intent == INTENT_UNKNOWN)
1445 attr->intent = intent;
1446 return check_conflict (attr, NULL, where);
1450 where = &gfc_current_locus;
1452 gfc_error ("INTENT (%s) conflicts with INTENT(%s) at %L",
1453 gfc_intent_string (attr->intent),
1454 gfc_intent_string (intent), where);
1460 /* No checks for use-association in public and private statements. */
1463 gfc_add_access (symbol_attribute *attr, gfc_access access,
1464 const char *name, locus *where)
1467 if (attr->access == ACCESS_UNKNOWN
1468 || (attr->use_assoc && attr->access != ACCESS_PRIVATE))
1470 attr->access = access;
1471 return check_conflict (attr, name, where);
1475 where = &gfc_current_locus;
1476 gfc_error ("ACCESS specification at %L was already specified", where);
1482 /* Set the is_bind_c field for the given symbol_attribute. */
1485 gfc_add_is_bind_c (symbol_attribute *attr, const char *name, locus *where,
1486 int is_proc_lang_bind_spec)
1489 if (is_proc_lang_bind_spec == 0 && attr->flavor == FL_PROCEDURE)
1490 gfc_error_now ("BIND(C) attribute at %L can only be used for "
1491 "variables or common blocks", where);
1492 else if (attr->is_bind_c)
1493 gfc_error_now ("Duplicate BIND attribute specified at %L", where);
1495 attr->is_bind_c = 1;
1498 where = &gfc_current_locus;
1500 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BIND(C) at %L", where)
1504 return check_conflict (attr, name, where);
1508 /* Set the extension field for the given symbol_attribute. */
1511 gfc_add_extension (symbol_attribute *attr, locus *where)
1514 where = &gfc_current_locus;
1516 if (attr->extension)
1517 gfc_error_now ("Duplicate EXTENDS attribute specified at %L", where);
1519 attr->extension = 1;
1521 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: EXTENDS at %L", where)
1530 gfc_add_explicit_interface (gfc_symbol *sym, ifsrc source,
1531 gfc_formal_arglist * formal, locus *where)
1534 if (check_used (&sym->attr, sym->name, where))
1538 where = &gfc_current_locus;
1540 if (sym->attr.if_source != IFSRC_UNKNOWN
1541 && sym->attr.if_source != IFSRC_DECL)
1543 gfc_error ("Symbol '%s' at %L already has an explicit interface",
1548 if (source == IFSRC_IFBODY && (sym->attr.dimension || sym->attr.allocatable))
1550 gfc_error ("'%s' at %L has attributes specified outside its INTERFACE "
1551 "body", sym->name, where);
1555 sym->formal = formal;
1556 sym->attr.if_source = source;
1562 /* Add a type to a symbol. */
1565 gfc_add_type (gfc_symbol *sym, gfc_typespec *ts, locus *where)
1571 where = &gfc_current_locus;
1574 type = sym->result->ts.type;
1576 type = sym->ts.type;
1578 if (sym->attr.result && type == BT_UNKNOWN && sym->ns->proc_name)
1579 type = sym->ns->proc_name->ts.type;
1581 if (type != BT_UNKNOWN && !(sym->attr.function && sym->attr.implicit_type))
1583 gfc_error ("Symbol '%s' at %L already has basic type of %s", sym->name,
1584 where, gfc_basic_typename (type));
1588 if (sym->attr.procedure && sym->ts.interface)
1590 gfc_error ("Procedure '%s' at %L may not have basic type of %s",
1591 sym->name, where, gfc_basic_typename (ts->type));
1595 flavor = sym->attr.flavor;
1597 if (flavor == FL_PROGRAM || flavor == FL_BLOCK_DATA || flavor == FL_MODULE
1598 || flavor == FL_LABEL
1599 || (flavor == FL_PROCEDURE && sym->attr.subroutine)
1600 || flavor == FL_DERIVED || flavor == FL_NAMELIST)
1602 gfc_error ("Symbol '%s' at %L cannot have a type", sym->name, where);
1611 /* Clears all attributes. */
1614 gfc_clear_attr (symbol_attribute *attr)
1616 memset (attr, 0, sizeof (symbol_attribute));
1620 /* Check for missing attributes in the new symbol. Currently does
1621 nothing, but it's not clear that it is unnecessary yet. */
1624 gfc_missing_attr (symbol_attribute *attr ATTRIBUTE_UNUSED,
1625 locus *where ATTRIBUTE_UNUSED)
1632 /* Copy an attribute to a symbol attribute, bit by bit. Some
1633 attributes have a lot of side-effects but cannot be present given
1634 where we are called from, so we ignore some bits. */
1637 gfc_copy_attr (symbol_attribute *dest, symbol_attribute *src, locus *where)
1639 int is_proc_lang_bind_spec;
1641 /* In line with the other attributes, we only add bits but do not remove
1642 them; cf. also PR 41034. */
1643 dest->ext_attr |= src->ext_attr;
1645 if (src->allocatable && gfc_add_allocatable (dest, where) == FAILURE)
1648 if (src->dimension && gfc_add_dimension (dest, NULL, where) == FAILURE)
1650 if (src->optional && gfc_add_optional (dest, where) == FAILURE)
1652 if (src->pointer && gfc_add_pointer (dest, where) == FAILURE)
1654 if (src->is_protected && gfc_add_protected (dest, NULL, where) == FAILURE)
1656 if (src->save && gfc_add_save (dest, NULL, where) == FAILURE)
1658 if (src->value && gfc_add_value (dest, NULL, where) == FAILURE)
1660 if (src->volatile_ && gfc_add_volatile (dest, NULL, where) == FAILURE)
1662 if (src->threadprivate
1663 && gfc_add_threadprivate (dest, NULL, where) == FAILURE)
1665 if (src->target && gfc_add_target (dest, where) == FAILURE)
1667 if (src->dummy && gfc_add_dummy (dest, NULL, where) == FAILURE)
1669 if (src->result && gfc_add_result (dest, NULL, where) == FAILURE)
1674 if (src->in_namelist && gfc_add_in_namelist (dest, NULL, where) == FAILURE)
1677 if (src->in_common && gfc_add_in_common (dest, NULL, where) == FAILURE)
1680 if (src->generic && gfc_add_generic (dest, NULL, where) == FAILURE)
1682 if (src->function && gfc_add_function (dest, NULL, where) == FAILURE)
1684 if (src->subroutine && gfc_add_subroutine (dest, NULL, where) == FAILURE)
1687 if (src->sequence && gfc_add_sequence (dest, NULL, where) == FAILURE)
1689 if (src->elemental && gfc_add_elemental (dest, where) == FAILURE)
1691 if (src->pure && gfc_add_pure (dest, where) == FAILURE)
1693 if (src->recursive && gfc_add_recursive (dest, where) == FAILURE)
1696 if (src->flavor != FL_UNKNOWN
1697 && gfc_add_flavor (dest, src->flavor, NULL, where) == FAILURE)
1700 if (src->intent != INTENT_UNKNOWN
1701 && gfc_add_intent (dest, src->intent, where) == FAILURE)
1704 if (src->access != ACCESS_UNKNOWN
1705 && gfc_add_access (dest, src->access, NULL, where) == FAILURE)
1708 if (gfc_missing_attr (dest, where) == FAILURE)
1711 if (src->cray_pointer && gfc_add_cray_pointer (dest, where) == FAILURE)
1713 if (src->cray_pointee && gfc_add_cray_pointee (dest, where) == FAILURE)
1716 is_proc_lang_bind_spec = (src->flavor == FL_PROCEDURE ? 1 : 0);
1718 && gfc_add_is_bind_c (dest, NULL, where, is_proc_lang_bind_spec)
1722 if (src->is_c_interop)
1723 dest->is_c_interop = 1;
1727 if (src->external && gfc_add_external (dest, where) == FAILURE)
1729 if (src->intrinsic && gfc_add_intrinsic (dest, where) == FAILURE)
1731 if (src->proc_pointer)
1732 dest->proc_pointer = 1;
1741 /************** Component name management ************/
1743 /* Component names of a derived type form their own little namespaces
1744 that are separate from all other spaces. The space is composed of
1745 a singly linked list of gfc_component structures whose head is
1746 located in the parent symbol. */
1749 /* Add a component name to a symbol. The call fails if the name is
1750 already present. On success, the component pointer is modified to
1751 point to the additional component structure. */
1754 gfc_add_component (gfc_symbol *sym, const char *name,
1755 gfc_component **component)
1757 gfc_component *p, *tail;
1761 for (p = sym->components; p; p = p->next)
1763 if (strcmp (p->name, name) == 0)
1765 gfc_error ("Component '%s' at %C already declared at %L",
1773 if (sym->attr.extension
1774 && gfc_find_component (sym->components->ts.u.derived, name, true, true))
1776 gfc_error ("Component '%s' at %C already in the parent type "
1777 "at %L", name, &sym->components->ts.u.derived->declared_at);
1781 /* Allocate a new component. */
1782 p = gfc_get_component ();
1785 sym->components = p;
1789 p->name = gfc_get_string (name);
1790 p->loc = gfc_current_locus;
1791 p->ts.type = BT_UNKNOWN;
1798 /* Recursive function to switch derived types of all symbol in a
1802 switch_types (gfc_symtree *st, gfc_symbol *from, gfc_symbol *to)
1810 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived == from)
1811 sym->ts.u.derived = to;
1813 switch_types (st->left, from, to);
1814 switch_types (st->right, from, to);
1818 /* This subroutine is called when a derived type is used in order to
1819 make the final determination about which version to use. The
1820 standard requires that a type be defined before it is 'used', but
1821 such types can appear in IMPLICIT statements before the actual
1822 definition. 'Using' in this context means declaring a variable to
1823 be that type or using the type constructor.
1825 If a type is used and the components haven't been defined, then we
1826 have to have a derived type in a parent unit. We find the node in
1827 the other namespace and point the symtree node in this namespace to
1828 that node. Further reference to this name point to the correct
1829 node. If we can't find the node in a parent namespace, then we have
1832 This subroutine takes a pointer to a symbol node and returns a
1833 pointer to the translated node or NULL for an error. Usually there
1834 is no translation and we return the node we were passed. */
1837 gfc_use_derived (gfc_symbol *sym)
1844 if (sym->components != NULL || sym->attr.zero_comp)
1845 return sym; /* Already defined. */
1847 if (sym->ns->parent == NULL)
1850 if (gfc_find_symbol (sym->name, sym->ns->parent, 1, &s))
1852 gfc_error ("Symbol '%s' at %C is ambiguous", sym->name);
1856 if (s == NULL || s->attr.flavor != FL_DERIVED)
1859 /* Get rid of symbol sym, translating all references to s. */
1860 for (i = 0; i < GFC_LETTERS; i++)
1862 t = &sym->ns->default_type[i];
1863 if (t->u.derived == sym)
1867 st = gfc_find_symtree (sym->ns->sym_root, sym->name);
1872 /* Unlink from list of modified symbols. */
1873 gfc_commit_symbol (sym);
1875 switch_types (sym->ns->sym_root, sym, s);
1877 /* TODO: Also have to replace sym -> s in other lists like
1878 namelists, common lists and interface lists. */
1879 gfc_free_symbol (sym);
1884 gfc_error ("Derived type '%s' at %C is being used before it is defined",
1890 /* Given a derived type node and a component name, try to locate the
1891 component structure. Returns the NULL pointer if the component is
1892 not found or the components are private. If noaccess is set, no access
1896 gfc_find_component (gfc_symbol *sym, const char *name,
1897 bool noaccess, bool silent)
1904 sym = gfc_use_derived (sym);
1909 for (p = sym->components; p; p = p->next)
1910 if (strcmp (p->name, name) == 0)
1914 && sym->attr.extension
1915 && sym->components->ts.type == BT_DERIVED)
1917 p = gfc_find_component (sym->components->ts.u.derived, name,
1919 /* Do not overwrite the error. */
1924 if (p == NULL && !silent)
1925 gfc_error ("'%s' at %C is not a member of the '%s' structure",
1928 else if (sym->attr.use_assoc && !noaccess)
1930 if (p->attr.access == ACCESS_PRIVATE)
1933 gfc_error ("Component '%s' at %C is a PRIVATE component of '%s'",
1938 /* If there were components given and all components are private, error
1939 out at this place. */
1940 if (p->attr.access != ACCESS_PUBLIC && sym->component_access == ACCESS_PRIVATE)
1943 gfc_error ("All components of '%s' are PRIVATE in structure"
1944 " constructor at %C", sym->name);
1953 /* Given a symbol, free all of the component structures and everything
1957 free_components (gfc_component *p)
1965 gfc_free_array_spec (p->as);
1966 gfc_free_expr (p->initializer);
1973 /******************** Statement label management ********************/
1975 /* Comparison function for statement labels, used for managing the
1979 compare_st_labels (void *a1, void *b1)
1981 int a = ((gfc_st_label *) a1)->value;
1982 int b = ((gfc_st_label *) b1)->value;
1988 /* Free a single gfc_st_label structure, making sure the tree is not
1989 messed up. This function is called only when some parse error
1993 gfc_free_st_label (gfc_st_label *label)
1999 gfc_delete_bbt (&gfc_current_ns->st_labels, label, compare_st_labels);
2001 if (label->format != NULL)
2002 gfc_free_expr (label->format);
2008 /* Free a whole tree of gfc_st_label structures. */
2011 free_st_labels (gfc_st_label *label)
2017 free_st_labels (label->left);
2018 free_st_labels (label->right);
2020 if (label->format != NULL)
2021 gfc_free_expr (label->format);
2026 /* Given a label number, search for and return a pointer to the label
2027 structure, creating it if it does not exist. */
2030 gfc_get_st_label (int labelno)
2034 /* First see if the label is already in this namespace. */
2035 lp = gfc_current_ns->st_labels;
2038 if (lp->value == labelno)
2041 if (lp->value < labelno)
2047 lp = XCNEW (gfc_st_label);
2049 lp->value = labelno;
2050 lp->defined = ST_LABEL_UNKNOWN;
2051 lp->referenced = ST_LABEL_UNKNOWN;
2053 gfc_insert_bbt (&gfc_current_ns->st_labels, lp, compare_st_labels);
2059 /* Called when a statement with a statement label is about to be
2060 accepted. We add the label to the list of the current namespace,
2061 making sure it hasn't been defined previously and referenced
2065 gfc_define_st_label (gfc_st_label *lp, gfc_sl_type type, locus *label_locus)
2069 labelno = lp->value;
2071 if (lp->defined != ST_LABEL_UNKNOWN)
2072 gfc_error ("Duplicate statement label %d at %L and %L", labelno,
2073 &lp->where, label_locus);
2076 lp->where = *label_locus;
2080 case ST_LABEL_FORMAT:
2081 if (lp->referenced == ST_LABEL_TARGET)
2082 gfc_error ("Label %d at %C already referenced as branch target",
2085 lp->defined = ST_LABEL_FORMAT;
2089 case ST_LABEL_TARGET:
2090 if (lp->referenced == ST_LABEL_FORMAT)
2091 gfc_error ("Label %d at %C already referenced as a format label",
2094 lp->defined = ST_LABEL_TARGET;
2099 lp->defined = ST_LABEL_BAD_TARGET;
2100 lp->referenced = ST_LABEL_BAD_TARGET;
2106 /* Reference a label. Given a label and its type, see if that
2107 reference is consistent with what is known about that label,
2108 updating the unknown state. Returns FAILURE if something goes
2112 gfc_reference_st_label (gfc_st_label *lp, gfc_sl_type type)
2114 gfc_sl_type label_type;
2121 labelno = lp->value;
2123 if (lp->defined != ST_LABEL_UNKNOWN)
2124 label_type = lp->defined;
2127 label_type = lp->referenced;
2128 lp->where = gfc_current_locus;
2131 if (label_type == ST_LABEL_FORMAT && type == ST_LABEL_TARGET)
2133 gfc_error ("Label %d at %C previously used as a FORMAT label", labelno);
2138 if ((label_type == ST_LABEL_TARGET || label_type == ST_LABEL_BAD_TARGET)
2139 && type == ST_LABEL_FORMAT)
2141 gfc_error ("Label %d at %C previously used as branch target", labelno);
2146 lp->referenced = type;
2154 /*******A helper function for creating new expressions*************/
2158 gfc_lval_expr_from_sym (gfc_symbol *sym)
2161 lval = gfc_get_expr ();
2162 lval->expr_type = EXPR_VARIABLE;
2163 lval->where = sym->declared_at;
2165 lval->symtree = gfc_find_symtree (sym->ns->sym_root, sym->name);
2167 /* It will always be a full array. */
2168 lval->rank = sym->as ? sym->as->rank : 0;
2171 lval->ref = gfc_get_ref ();
2172 lval->ref->type = REF_ARRAY;
2173 lval->ref->u.ar.type = AR_FULL;
2174 lval->ref->u.ar.dimen = lval->rank;
2175 lval->ref->u.ar.where = sym->declared_at;
2176 lval->ref->u.ar.as = sym->as;
2183 /************** Symbol table management subroutines ****************/
2185 /* Basic details: Fortran 95 requires a potentially unlimited number
2186 of distinct namespaces when compiling a program unit. This case
2187 occurs during a compilation of internal subprograms because all of
2188 the internal subprograms must be read before we can start
2189 generating code for the host.
2191 Given the tricky nature of the Fortran grammar, we must be able to
2192 undo changes made to a symbol table if the current interpretation
2193 of a statement is found to be incorrect. Whenever a symbol is
2194 looked up, we make a copy of it and link to it. All of these
2195 symbols are kept in a singly linked list so that we can commit or
2196 undo the changes at a later time.
2198 A symtree may point to a symbol node outside of its namespace. In
2199 this case, that symbol has been used as a host associated variable
2200 at some previous time. */
2202 /* Allocate a new namespace structure. Copies the implicit types from
2203 PARENT if PARENT_TYPES is set. */
2206 gfc_get_namespace (gfc_namespace *parent, int parent_types)
2213 ns = XCNEW (gfc_namespace);
2214 ns->sym_root = NULL;
2215 ns->uop_root = NULL;
2216 ns->tb_sym_root = NULL;
2217 ns->finalizers = NULL;
2218 ns->default_access = ACCESS_UNKNOWN;
2219 ns->parent = parent;
2221 for (in = GFC_INTRINSIC_BEGIN; in != GFC_INTRINSIC_END; in++)
2223 ns->operator_access[in] = ACCESS_UNKNOWN;
2224 ns->tb_op[in] = NULL;
2227 /* Initialize default implicit types. */
2228 for (i = 'a'; i <= 'z'; i++)
2230 ns->set_flag[i - 'a'] = 0;
2231 ts = &ns->default_type[i - 'a'];
2233 if (parent_types && ns->parent != NULL)
2235 /* Copy parent settings. */
2236 *ts = ns->parent->default_type[i - 'a'];
2240 if (gfc_option.flag_implicit_none != 0)
2246 if ('i' <= i && i <= 'n')
2248 ts->type = BT_INTEGER;
2249 ts->kind = gfc_default_integer_kind;
2254 ts->kind = gfc_default_real_kind;
2264 /* Comparison function for symtree nodes. */
2267 compare_symtree (void *_st1, void *_st2)
2269 gfc_symtree *st1, *st2;
2271 st1 = (gfc_symtree *) _st1;
2272 st2 = (gfc_symtree *) _st2;
2274 return strcmp (st1->name, st2->name);
2278 /* Allocate a new symtree node and associate it with the new symbol. */
2281 gfc_new_symtree (gfc_symtree **root, const char *name)
2285 st = XCNEW (gfc_symtree);
2286 st->name = gfc_get_string (name);
2288 gfc_insert_bbt (root, st, compare_symtree);
2293 /* Delete a symbol from the tree. Does not free the symbol itself! */
2296 gfc_delete_symtree (gfc_symtree **root, const char *name)
2298 gfc_symtree st, *st0;
2300 st0 = gfc_find_symtree (*root, name);
2302 st.name = gfc_get_string (name);
2303 gfc_delete_bbt (root, &st, compare_symtree);
2309 /* Given a root symtree node and a name, try to find the symbol within
2310 the namespace. Returns NULL if the symbol is not found. */
2313 gfc_find_symtree (gfc_symtree *st, const char *name)
2319 c = strcmp (name, st->name);
2323 st = (c < 0) ? st->left : st->right;
2330 /* Return a symtree node with a name that is guaranteed to be unique
2331 within the namespace and corresponds to an illegal fortran name. */
2334 gfc_get_unique_symtree (gfc_namespace *ns)
2336 char name[GFC_MAX_SYMBOL_LEN + 1];
2337 static int serial = 0;
2339 sprintf (name, "@%d", serial++);
2340 return gfc_new_symtree (&ns->sym_root, name);
2344 /* Given a name find a user operator node, creating it if it doesn't
2345 exist. These are much simpler than symbols because they can't be
2346 ambiguous with one another. */
2349 gfc_get_uop (const char *name)
2354 st = gfc_find_symtree (gfc_current_ns->uop_root, name);
2358 st = gfc_new_symtree (&gfc_current_ns->uop_root, name);
2360 uop = st->n.uop = XCNEW (gfc_user_op);
2361 uop->name = gfc_get_string (name);
2362 uop->access = ACCESS_UNKNOWN;
2363 uop->ns = gfc_current_ns;
2369 /* Given a name find the user operator node. Returns NULL if it does
2373 gfc_find_uop (const char *name, gfc_namespace *ns)
2378 ns = gfc_current_ns;
2380 st = gfc_find_symtree (ns->uop_root, name);
2381 return (st == NULL) ? NULL : st->n.uop;
2385 /* Remove a gfc_symbol structure and everything it points to. */
2388 gfc_free_symbol (gfc_symbol *sym)
2394 gfc_free_array_spec (sym->as);
2396 free_components (sym->components);
2398 gfc_free_expr (sym->value);
2400 gfc_free_namelist (sym->namelist);
2402 gfc_free_namespace (sym->formal_ns);
2404 if (!sym->attr.generic_copy)
2405 gfc_free_interface (sym->generic);
2407 gfc_free_formal_arglist (sym->formal);
2409 gfc_free_namespace (sym->f2k_derived);
2415 /* Allocate and initialize a new symbol node. */
2418 gfc_new_symbol (const char *name, gfc_namespace *ns)
2422 p = XCNEW (gfc_symbol);
2424 gfc_clear_ts (&p->ts);
2425 gfc_clear_attr (&p->attr);
2428 p->declared_at = gfc_current_locus;
2430 if (strlen (name) > GFC_MAX_SYMBOL_LEN)
2431 gfc_internal_error ("new_symbol(): Symbol name too long");
2433 p->name = gfc_get_string (name);
2435 /* Make sure flags for symbol being C bound are clear initially. */
2436 p->attr.is_bind_c = 0;
2437 p->attr.is_iso_c = 0;
2438 /* Make sure the binding label field has a Nul char to start. */
2439 p->binding_label[0] = '\0';
2441 /* Clear the ptrs we may need. */
2442 p->common_block = NULL;
2443 p->f2k_derived = NULL;
2449 /* Generate an error if a symbol is ambiguous. */
2452 ambiguous_symbol (const char *name, gfc_symtree *st)
2455 if (st->n.sym->module)
2456 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2457 "from module '%s'", name, st->n.sym->name, st->n.sym->module);
2459 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2460 "from current program unit", name, st->n.sym->name);
2464 /* Search for a symtree starting in the current namespace, resorting to
2465 any parent namespaces if requested by a nonzero parent_flag.
2466 Returns nonzero if the name is ambiguous. */
2469 gfc_find_sym_tree (const char *name, gfc_namespace *ns, int parent_flag,
2470 gfc_symtree **result)
2475 ns = gfc_current_ns;
2479 st = gfc_find_symtree (ns->sym_root, name);
2483 /* Ambiguous generic interfaces are permitted, as long
2484 as the specific interfaces are different. */
2485 if (st->ambiguous && !st->n.sym->attr.generic)
2487 ambiguous_symbol (name, st);
2506 /* Same, but returns the symbol instead. */
2509 gfc_find_symbol (const char *name, gfc_namespace *ns, int parent_flag,
2510 gfc_symbol **result)
2515 i = gfc_find_sym_tree (name, ns, parent_flag, &st);
2520 *result = st->n.sym;
2526 /* Save symbol with the information necessary to back it out. */
2529 save_symbol_data (gfc_symbol *sym)
2532 if (sym->gfc_new || sym->old_symbol != NULL)
2535 sym->old_symbol = XCNEW (gfc_symbol);
2536 *(sym->old_symbol) = *sym;
2538 sym->tlink = changed_syms;
2543 /* Given a name, find a symbol, or create it if it does not exist yet
2544 in the current namespace. If the symbol is found we make sure that
2547 The integer return code indicates
2549 1 The symbol name was ambiguous
2550 2 The name meant to be established was already host associated.
2552 So if the return value is nonzero, then an error was issued. */
2555 gfc_get_sym_tree (const char *name, gfc_namespace *ns, gfc_symtree **result,
2556 bool allow_subroutine)
2561 /* This doesn't usually happen during resolution. */
2563 ns = gfc_current_ns;
2565 /* Try to find the symbol in ns. */
2566 st = gfc_find_symtree (ns->sym_root, name);
2570 /* If not there, create a new symbol. */
2571 p = gfc_new_symbol (name, ns);
2573 /* Add to the list of tentative symbols. */
2574 p->old_symbol = NULL;
2575 p->tlink = changed_syms;
2580 st = gfc_new_symtree (&ns->sym_root, name);
2587 /* Make sure the existing symbol is OK. Ambiguous
2588 generic interfaces are permitted, as long as the
2589 specific interfaces are different. */
2590 if (st->ambiguous && !st->n.sym->attr.generic)
2592 ambiguous_symbol (name, st);
2597 if (p->ns != ns && (!p->attr.function || ns->proc_name != p)
2598 && !(allow_subroutine && p->attr.subroutine)
2599 && !(ns->proc_name && ns->proc_name->attr.if_source == IFSRC_IFBODY
2600 && (ns->has_import_set || p->attr.imported)))
2602 /* Symbol is from another namespace. */
2603 gfc_error ("Symbol '%s' at %C has already been host associated",
2610 /* Copy in case this symbol is changed. */
2611 save_symbol_data (p);
2620 gfc_get_symbol (const char *name, gfc_namespace *ns, gfc_symbol **result)
2625 i = gfc_get_sym_tree (name, ns, &st, false);
2630 *result = st->n.sym;
2637 /* Subroutine that searches for a symbol, creating it if it doesn't
2638 exist, but tries to host-associate the symbol if possible. */
2641 gfc_get_ha_sym_tree (const char *name, gfc_symtree **result)
2646 i = gfc_find_sym_tree (name, gfc_current_ns, 0, &st);
2648 /* Special case: If we're in a SELECT TYPE block,
2649 replace the selector variable by a temporary. */
2650 if (gfc_current_state () == COMP_SELECT_TYPE
2651 && st && st->n.sym == type_selector)
2652 st = select_type_tmp;
2656 save_symbol_data (st->n.sym);
2661 if (gfc_current_ns->parent != NULL)
2663 i = gfc_find_sym_tree (name, gfc_current_ns->parent, 1, &st);
2674 return gfc_get_sym_tree (name, gfc_current_ns, result, false);
2679 gfc_get_ha_symbol (const char *name, gfc_symbol **result)
2684 i = gfc_get_ha_sym_tree (name, &st);
2687 *result = st->n.sym;
2694 /* Return true if both symbols could refer to the same data object. Does
2695 not take account of aliasing due to equivalence statements. */
2698 gfc_symbols_could_alias (gfc_symbol *lsym, gfc_symbol *rsym)
2700 /* Aliasing isn't possible if the symbols have different base types. */
2701 if (gfc_compare_types (&lsym->ts, &rsym->ts) == 0)
2704 /* Pointers can point to other pointers, target objects and allocatable
2705 objects. Two allocatable objects cannot share the same storage. */
2706 if (lsym->attr.pointer
2707 && (rsym->attr.pointer || rsym->attr.allocatable || rsym->attr.target))
2709 if (lsym->attr.target && rsym->attr.pointer)
2711 if (lsym->attr.allocatable && rsym->attr.pointer)
2718 /* Undoes all the changes made to symbols in the current statement.
2719 This subroutine is made simpler due to the fact that attributes are
2720 never removed once added. */
2723 gfc_undo_symbols (void)
2725 gfc_symbol *p, *q, *old;
2726 tentative_tbp *tbp, *tbq;
2728 for (p = changed_syms; p; p = q)
2734 /* Symbol was new. */
2735 if (p->attr.in_common && p->common_block->head)
2737 /* If the symbol was added to any common block, it
2738 needs to be removed to stop the resolver looking
2739 for a (possibly) dead symbol. */
2741 if (p->common_block->head == p)
2742 p->common_block->head = p->common_next;
2745 gfc_symbol *cparent, *csym;
2747 cparent = p->common_block->head;
2748 csym = cparent->common_next;
2753 csym = csym->common_next;
2756 gcc_assert(cparent->common_next == p);
2758 cparent->common_next = csym->common_next;
2762 gfc_delete_symtree (&p->ns->sym_root, p->name);
2766 gfc_internal_error ("gfc_undo_symbols(): Negative refs");
2768 gfc_free_symbol (p);
2772 /* Restore previous state of symbol. Just copy simple stuff. */
2774 old = p->old_symbol;
2776 p->ts.type = old->ts.type;
2777 p->ts.kind = old->ts.kind;
2779 p->attr = old->attr;
2781 if (p->value != old->value)
2783 gfc_free_expr (old->value);
2787 if (p->as != old->as)
2790 gfc_free_array_spec (p->as);
2794 p->generic = old->generic;
2795 p->component_access = old->component_access;
2797 if (p->namelist != NULL && old->namelist == NULL)
2799 gfc_free_namelist (p->namelist);
2804 if (p->namelist_tail != old->namelist_tail)
2806 gfc_free_namelist (old->namelist_tail);
2807 old->namelist_tail->next = NULL;
2811 p->namelist_tail = old->namelist_tail;
2813 if (p->formal != old->formal)
2815 gfc_free_formal_arglist (p->formal);
2816 p->formal = old->formal;
2819 gfc_free (p->old_symbol);
2820 p->old_symbol = NULL;
2824 changed_syms = NULL;
2826 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
2829 /* Procedure is already marked `error' by default. */
2832 tentative_tbp_list = NULL;
2836 /* Free sym->old_symbol. sym->old_symbol is mostly a shallow copy of sym; the
2837 components of old_symbol that might need deallocation are the "allocatables"
2838 that are restored in gfc_undo_symbols(), with two exceptions: namelist and
2839 namelist_tail. In case these differ between old_symbol and sym, it's just
2840 because sym->namelist has gotten a few more items. */
2843 free_old_symbol (gfc_symbol *sym)
2846 if (sym->old_symbol == NULL)
2849 if (sym->old_symbol->as != sym->as)
2850 gfc_free_array_spec (sym->old_symbol->as);
2852 if (sym->old_symbol->value != sym->value)
2853 gfc_free_expr (sym->old_symbol->value);
2855 if (sym->old_symbol->formal != sym->formal)
2856 gfc_free_formal_arglist (sym->old_symbol->formal);
2858 gfc_free (sym->old_symbol);
2859 sym->old_symbol = NULL;
2863 /* Makes the changes made in the current statement permanent-- gets
2864 rid of undo information. */
2867 gfc_commit_symbols (void)
2870 tentative_tbp *tbp, *tbq;
2872 for (p = changed_syms; p; p = q)
2878 free_old_symbol (p);
2880 changed_syms = NULL;
2882 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
2885 tbp->proc->error = 0;
2888 tentative_tbp_list = NULL;
2892 /* Makes the changes made in one symbol permanent -- gets rid of undo
2896 gfc_commit_symbol (gfc_symbol *sym)
2900 if (changed_syms == sym)
2901 changed_syms = sym->tlink;
2904 for (p = changed_syms; p; p = p->tlink)
2905 if (p->tlink == sym)
2907 p->tlink = sym->tlink;
2916 free_old_symbol (sym);
2920 /* Recursively free trees containing type-bound procedures. */
2923 free_tb_tree (gfc_symtree *t)
2928 free_tb_tree (t->left);
2929 free_tb_tree (t->right);
2931 /* TODO: Free type-bound procedure structs themselves; probably needs some
2932 sort of ref-counting mechanism. */
2938 /* Recursive function that deletes an entire tree and all the common
2939 head structures it points to. */
2942 free_common_tree (gfc_symtree * common_tree)
2944 if (common_tree == NULL)
2947 free_common_tree (common_tree->left);
2948 free_common_tree (common_tree->right);
2950 gfc_free (common_tree);
2954 /* Recursive function that deletes an entire tree and all the user
2955 operator nodes that it contains. */
2958 free_uop_tree (gfc_symtree *uop_tree)
2960 if (uop_tree == NULL)
2963 free_uop_tree (uop_tree->left);
2964 free_uop_tree (uop_tree->right);
2966 gfc_free_interface (uop_tree->n.uop->op);
2967 gfc_free (uop_tree->n.uop);
2968 gfc_free (uop_tree);
2972 /* Recursive function that deletes an entire tree and all the symbols
2973 that it contains. */
2976 free_sym_tree (gfc_symtree *sym_tree)
2981 if (sym_tree == NULL)
2984 free_sym_tree (sym_tree->left);
2985 free_sym_tree (sym_tree->right);
2987 sym = sym_tree->n.sym;
2991 gfc_internal_error ("free_sym_tree(): Negative refs");
2993 if (sym->formal_ns != NULL && sym->refs == 1)
2995 /* As formal_ns contains a reference to sym, delete formal_ns just
2996 before the deletion of sym. */
2997 ns = sym->formal_ns;
2998 sym->formal_ns = NULL;
2999 gfc_free_namespace (ns);
3001 else if (sym->refs == 0)
3003 /* Go ahead and delete the symbol. */
3004 gfc_free_symbol (sym);
3007 gfc_free (sym_tree);
3011 /* Free the derived type list. */
3014 gfc_free_dt_list (void)
3016 gfc_dt_list *dt, *n;
3018 for (dt = gfc_derived_types; dt; dt = n)
3024 gfc_derived_types = NULL;
3028 /* Free the gfc_equiv_info's. */
3031 gfc_free_equiv_infos (gfc_equiv_info *s)
3035 gfc_free_equiv_infos (s->next);
3040 /* Free the gfc_equiv_lists. */
3043 gfc_free_equiv_lists (gfc_equiv_list *l)
3047 gfc_free_equiv_lists (l->next);
3048 gfc_free_equiv_infos (l->equiv);
3053 /* Free a finalizer procedure list. */
3056 gfc_free_finalizer (gfc_finalizer* el)
3062 --el->proc_sym->refs;
3063 if (!el->proc_sym->refs)
3064 gfc_free_symbol (el->proc_sym);
3072 gfc_free_finalizer_list (gfc_finalizer* list)
3076 gfc_finalizer* current = list;
3078 gfc_free_finalizer (current);
3083 /* Create a new gfc_charlen structure and add it to a namespace.
3084 If 'old_cl' is given, the newly created charlen will be a copy of it. */
3087 gfc_new_charlen (gfc_namespace *ns, gfc_charlen *old_cl)
3090 cl = gfc_get_charlen ();
3092 /* Put into namespace. */
3093 cl->next = ns->cl_list;
3099 cl->length = gfc_copy_expr (old_cl->length);
3100 cl->length_from_typespec = old_cl->length_from_typespec;
3101 cl->backend_decl = old_cl->backend_decl;
3102 cl->passed_length = old_cl->passed_length;
3103 cl->resolved = old_cl->resolved;
3110 /* Free the charlen list from cl to end (end is not freed).
3111 Free the whole list if end is NULL. */
3113 void gfc_free_charlen (gfc_charlen *cl, gfc_charlen *end)
3117 for (; cl != end; cl = cl2)
3122 gfc_free_expr (cl->length);
3128 /* Free a namespace structure and everything below it. Interface
3129 lists associated with intrinsic operators are not freed. These are
3130 taken care of when a specific name is freed. */
3133 gfc_free_namespace (gfc_namespace *ns)
3135 gfc_namespace *p, *q;
3144 gcc_assert (ns->refs == 0);
3146 gfc_free_statements (ns->code);
3148 free_sym_tree (ns->sym_root);
3149 free_uop_tree (ns->uop_root);
3150 free_common_tree (ns->common_root);
3151 free_tb_tree (ns->tb_sym_root);
3152 free_tb_tree (ns->tb_uop_root);
3153 gfc_free_finalizer_list (ns->finalizers);
3154 gfc_free_charlen (ns->cl_list, NULL);
3155 free_st_labels (ns->st_labels);
3157 gfc_free_equiv (ns->equiv);
3158 gfc_free_equiv_lists (ns->equiv_lists);
3159 gfc_free_use_stmts (ns->use_stmts);
3161 for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++)
3162 gfc_free_interface (ns->op[i]);
3164 gfc_free_data (ns->data);
3168 /* Recursively free any contained namespaces. */
3173 gfc_free_namespace (q);
3179 gfc_symbol_init_2 (void)
3182 gfc_current_ns = gfc_get_namespace (NULL, 0);
3187 gfc_symbol_done_2 (void)
3190 gfc_free_namespace (gfc_current_ns);
3191 gfc_current_ns = NULL;
3192 gfc_free_dt_list ();
3196 /* Clear mark bits from symbol nodes associated with a symtree node. */
3199 clear_sym_mark (gfc_symtree *st)
3202 st->n.sym->mark = 0;
3206 /* Recursively traverse the symtree nodes. */
3209 gfc_traverse_symtree (gfc_symtree *st, void (*func) (gfc_symtree *))
3214 gfc_traverse_symtree (st->left, func);
3216 gfc_traverse_symtree (st->right, func);
3220 /* Recursive namespace traversal function. */
3223 traverse_ns (gfc_symtree *st, void (*func) (gfc_symbol *))
3229 traverse_ns (st->left, func);
3231 if (st->n.sym->mark == 0)
3232 (*func) (st->n.sym);
3233 st->n.sym->mark = 1;
3235 traverse_ns (st->right, func);
3239 /* Call a given function for all symbols in the namespace. We take
3240 care that each gfc_symbol node is called exactly once. */
3243 gfc_traverse_ns (gfc_namespace *ns, void (*func) (gfc_symbol *))
3246 gfc_traverse_symtree (ns->sym_root, clear_sym_mark);
3248 traverse_ns (ns->sym_root, func);
3252 /* Return TRUE when name is the name of an intrinsic type. */
3255 gfc_is_intrinsic_typename (const char *name)
3257 if (strcmp (name, "integer") == 0
3258 || strcmp (name, "real") == 0
3259 || strcmp (name, "character") == 0
3260 || strcmp (name, "logical") == 0
3261 || strcmp (name, "complex") == 0
3262 || strcmp (name, "doubleprecision") == 0
3263 || strcmp (name, "doublecomplex") == 0)
3270 /* Return TRUE if the symbol is an automatic variable. */
3273 gfc_is_var_automatic (gfc_symbol *sym)
3275 /* Pointer and allocatable variables are never automatic. */
3276 if (sym->attr.pointer || sym->attr.allocatable)
3278 /* Check for arrays with non-constant size. */
3279 if (sym->attr.dimension && sym->as
3280 && !gfc_is_compile_time_shape (sym->as))
3282 /* Check for non-constant length character variables. */
3283 if (sym->ts.type == BT_CHARACTER
3285 && !gfc_is_constant_expr (sym->ts.u.cl->length))
3290 /* Given a symbol, mark it as SAVEd if it is allowed. */
3293 save_symbol (gfc_symbol *sym)
3296 if (sym->attr.use_assoc)
3299 if (sym->attr.in_common
3302 || sym->attr.flavor != FL_VARIABLE)
3304 /* Automatic objects are not saved. */
3305 if (gfc_is_var_automatic (sym))
3307 gfc_add_save (&sym->attr, sym->name, &sym->declared_at);
3311 /* Mark those symbols which can be SAVEd as such. */
3314 gfc_save_all (gfc_namespace *ns)
3316 gfc_traverse_ns (ns, save_symbol);
3321 /* Make sure that no changes to symbols are pending. */
3324 gfc_symbol_state(void) {
3326 if (changed_syms != NULL)
3327 gfc_internal_error("Symbol changes still pending!");
3332 /************** Global symbol handling ************/
3335 /* Search a tree for the global symbol. */
3338 gfc_find_gsymbol (gfc_gsymbol *symbol, const char *name)
3347 c = strcmp (name, symbol->name);
3351 symbol = (c < 0) ? symbol->left : symbol->right;
3358 /* Compare two global symbols. Used for managing the BB tree. */
3361 gsym_compare (void *_s1, void *_s2)
3363 gfc_gsymbol *s1, *s2;
3365 s1 = (gfc_gsymbol *) _s1;
3366 s2 = (gfc_gsymbol *) _s2;
3367 return strcmp (s1->name, s2->name);
3371 /* Get a global symbol, creating it if it doesn't exist. */
3374 gfc_get_gsymbol (const char *name)
3378 s = gfc_find_gsymbol (gfc_gsym_root, name);
3382 s = XCNEW (gfc_gsymbol);
3383 s->type = GSYM_UNKNOWN;
3384 s->name = gfc_get_string (name);
3386 gfc_insert_bbt (&gfc_gsym_root, s, gsym_compare);
3393 get_iso_c_binding_dt (int sym_id)
3395 gfc_dt_list *dt_list;
3397 dt_list = gfc_derived_types;
3399 /* Loop through the derived types in the name list, searching for
3400 the desired symbol from iso_c_binding. Search the parent namespaces
3401 if necessary and requested to (parent_flag). */
3402 while (dt_list != NULL)
3404 if (dt_list->derived->from_intmod != INTMOD_NONE
3405 && dt_list->derived->intmod_sym_id == sym_id)
3406 return dt_list->derived;
3408 dt_list = dt_list->next;
3415 /* Verifies that the given derived type symbol, derived_sym, is interoperable
3416 with C. This is necessary for any derived type that is BIND(C) and for
3417 derived types that are parameters to functions that are BIND(C). All
3418 fields of the derived type are required to be interoperable, and are tested
3419 for such. If an error occurs, the errors are reported here, allowing for
3420 multiple errors to be handled for a single derived type. */
3423 verify_bind_c_derived_type (gfc_symbol *derived_sym)
3425 gfc_component *curr_comp = NULL;
3426 gfc_try is_c_interop = FAILURE;
3427 gfc_try retval = SUCCESS;
3429 if (derived_sym == NULL)
3430 gfc_internal_error ("verify_bind_c_derived_type(): Given symbol is "
3431 "unexpectedly NULL");
3433 /* If we've already looked at this derived symbol, do not look at it again
3434 so we don't repeat warnings/errors. */
3435 if (derived_sym->ts.is_c_interop)
3438 /* The derived type must have the BIND attribute to be interoperable
3439 J3/04-007, Section 15.2.3. */
3440 if (derived_sym->attr.is_bind_c != 1)
3442 derived_sym->ts.is_c_interop = 0;
3443 gfc_error_now ("Derived type '%s' declared at %L must have the BIND "
3444 "attribute to be C interoperable", derived_sym->name,
3445 &(derived_sym->declared_at));
3449 curr_comp = derived_sym->components;
3451 /* TODO: is this really an error? */
3452 if (curr_comp == NULL)
3454 gfc_error ("Derived type '%s' at %L is empty",
3455 derived_sym->name, &(derived_sym->declared_at));
3459 /* Initialize the derived type as being C interoperable.
3460 If we find an error in the components, this will be set false. */
3461 derived_sym->ts.is_c_interop = 1;
3463 /* Loop through the list of components to verify that the kind of
3464 each is a C interoperable type. */
3467 /* The components cannot be pointers (fortran sense).
3468 J3/04-007, Section 15.2.3, C1505. */
3469 if (curr_comp->attr.pointer != 0)
3471 gfc_error ("Component '%s' at %L cannot have the "
3472 "POINTER attribute because it is a member "
3473 "of the BIND(C) derived type '%s' at %L",
3474 curr_comp->name, &(curr_comp->loc),
3475 derived_sym->name, &(derived_sym->declared_at));
3479 if (curr_comp->attr.proc_pointer != 0)
3481 gfc_error ("Procedure pointer component '%s' at %L cannot be a member"
3482 " of the BIND(C) derived type '%s' at %L", curr_comp->name,
3483 &curr_comp->loc, derived_sym->name,
3484 &derived_sym->declared_at);
3488 /* The components cannot be allocatable.
3489 J3/04-007, Section 15.2.3, C1505. */
3490 if (curr_comp->attr.allocatable != 0)
3492 gfc_error ("Component '%s' at %L cannot have the "
3493 "ALLOCATABLE attribute because it is a member "
3494 "of the BIND(C) derived type '%s' at %L",
3495 curr_comp->name, &(curr_comp->loc),
3496 derived_sym->name, &(derived_sym->declared_at));
3500 /* BIND(C) derived types must have interoperable components. */
3501 if (curr_comp->ts.type == BT_DERIVED
3502 && curr_comp->ts.u.derived->ts.is_iso_c != 1
3503 && curr_comp->ts.u.derived != derived_sym)
3505 /* This should be allowed; the draft says a derived-type can not
3506 have type parameters if it is has the BIND attribute. Type
3507 parameters seem to be for making parameterized derived types.
3508 There's no need to verify the type if it is c_ptr/c_funptr. */
3509 retval = verify_bind_c_derived_type (curr_comp->ts.u.derived);
3513 /* Grab the typespec for the given component and test the kind. */
3514 is_c_interop = verify_c_interop (&(curr_comp->ts));
3516 if (is_c_interop != SUCCESS)
3518 /* Report warning and continue since not fatal. The
3519 draft does specify a constraint that requires all fields
3520 to interoperate, but if the user says real(4), etc., it
3521 may interoperate with *something* in C, but the compiler
3522 most likely won't know exactly what. Further, it may not
3523 interoperate with the same data type(s) in C if the user
3524 recompiles with different flags (e.g., -m32 and -m64 on
3525 x86_64 and using integer(4) to claim interop with a
3527 if (derived_sym->attr.is_bind_c == 1)
3528 /* If the derived type is bind(c), all fields must be
3530 gfc_warning ("Component '%s' in derived type '%s' at %L "
3531 "may not be C interoperable, even though "
3532 "derived type '%s' is BIND(C)",
3533 curr_comp->name, derived_sym->name,
3534 &(curr_comp->loc), derived_sym->name);
3536 /* If derived type is param to bind(c) routine, or to one
3537 of the iso_c_binding procs, it must be interoperable, so
3538 all fields must interop too. */
3539 gfc_warning ("Component '%s' in derived type '%s' at %L "
3540 "may not be C interoperable",
3541 curr_comp->name, derived_sym->name,
3546 curr_comp = curr_comp->next;
3547 } while (curr_comp != NULL);
3550 /* Make sure we don't have conflicts with the attributes. */
3551 if (derived_sym->attr.access == ACCESS_PRIVATE)
3553 gfc_error ("Derived type '%s' at %L cannot be declared with both "
3554 "PRIVATE and BIND(C) attributes", derived_sym->name,
3555 &(derived_sym->declared_at));
3559 if (derived_sym->attr.sequence != 0)
3561 gfc_error ("Derived type '%s' at %L cannot have the SEQUENCE "
3562 "attribute because it is BIND(C)", derived_sym->name,
3563 &(derived_sym->declared_at));
3567 /* Mark the derived type as not being C interoperable if we found an
3568 error. If there were only warnings, proceed with the assumption
3569 it's interoperable. */
3570 if (retval == FAILURE)
3571 derived_sym->ts.is_c_interop = 0;
3577 /* Generate symbols for the named constants c_null_ptr and c_null_funptr. */
3580 gen_special_c_interop_ptr (int ptr_id, const char *ptr_name,
3581 const char *module_name)
3583 gfc_symtree *tmp_symtree;
3584 gfc_symbol *tmp_sym;
3586 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, ptr_name);
3588 if (tmp_symtree != NULL)
3589 tmp_sym = tmp_symtree->n.sym;
3593 gfc_internal_error ("gen_special_c_interop_ptr(): Unable to "
3594 "create symbol for %s", ptr_name);
3597 /* Set up the symbol's important fields. Save attr required so we can
3598 initialize the ptr to NULL. */
3599 tmp_sym->attr.save = SAVE_EXPLICIT;
3600 tmp_sym->ts.is_c_interop = 1;
3601 tmp_sym->attr.is_c_interop = 1;
3602 tmp_sym->ts.is_iso_c = 1;
3603 tmp_sym->ts.type = BT_DERIVED;
3605 /* The c_ptr and c_funptr derived types will provide the
3606 definition for c_null_ptr and c_null_funptr, respectively. */
3607 if (ptr_id == ISOCBINDING_NULL_PTR)
3608 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_PTR);
3610 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3611 if (tmp_sym->ts.u.derived == NULL)
3613 /* This can occur if the user forgot to declare c_ptr or
3614 c_funptr and they're trying to use one of the procedures
3615 that has arg(s) of the missing type. In this case, a
3616 regular version of the thing should have been put in the
3618 generate_isocbinding_symbol (module_name, ptr_id == ISOCBINDING_NULL_PTR
3619 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR,
3620 (const char *) (ptr_id == ISOCBINDING_NULL_PTR
3621 ? "_gfortran_iso_c_binding_c_ptr"
3622 : "_gfortran_iso_c_binding_c_funptr"));
3624 tmp_sym->ts.u.derived =
3625 get_iso_c_binding_dt (ptr_id == ISOCBINDING_NULL_PTR
3626 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR);
3629 /* Module name is some mangled version of iso_c_binding. */
3630 tmp_sym->module = gfc_get_string (module_name);
3632 /* Say it's from the iso_c_binding module. */
3633 tmp_sym->attr.is_iso_c = 1;
3635 tmp_sym->attr.use_assoc = 1;
3636 tmp_sym->attr.is_bind_c = 1;
3637 /* Set the binding_label. */
3638 sprintf (tmp_sym->binding_label, "%s_%s", module_name, tmp_sym->name);
3640 /* Set the c_address field of c_null_ptr and c_null_funptr to
3641 the value of NULL. */
3642 tmp_sym->value = gfc_get_expr ();
3643 tmp_sym->value->expr_type = EXPR_STRUCTURE;
3644 tmp_sym->value->ts.type = BT_DERIVED;
3645 tmp_sym->value->ts.u.derived = tmp_sym->ts.u.derived;
3646 /* Create a constructor with no expr, that way we can recognize if the user
3647 tries to call the structure constructor for one of the iso_c_binding
3648 derived types during resolution (resolve_structure_cons). */
3649 tmp_sym->value->value.constructor = gfc_get_constructor ();
3650 /* Must declare c_null_ptr and c_null_funptr as having the
3651 PARAMETER attribute so they can be used in init expressions. */
3652 tmp_sym->attr.flavor = FL_PARAMETER;
3658 /* Add a formal argument, gfc_formal_arglist, to the
3659 end of the given list of arguments. Set the reference to the
3660 provided symbol, param_sym, in the argument. */
3663 add_formal_arg (gfc_formal_arglist **head,
3664 gfc_formal_arglist **tail,
3665 gfc_formal_arglist *formal_arg,
3666 gfc_symbol *param_sym)
3668 /* Put in list, either as first arg or at the tail (curr arg). */
3670 *head = *tail = formal_arg;
3673 (*tail)->next = formal_arg;
3674 (*tail) = formal_arg;
3677 (*tail)->sym = param_sym;
3678 (*tail)->next = NULL;
3684 /* Generates a symbol representing the CPTR argument to an
3685 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3686 CPTR and add it to the provided argument list. */
3689 gen_cptr_param (gfc_formal_arglist **head,
3690 gfc_formal_arglist **tail,
3691 const char *module_name,
3692 gfc_namespace *ns, const char *c_ptr_name,
3695 gfc_symbol *param_sym = NULL;
3696 gfc_symbol *c_ptr_sym = NULL;
3697 gfc_symtree *param_symtree = NULL;
3698 gfc_formal_arglist *formal_arg = NULL;
3699 const char *c_ptr_in;
3700 const char *c_ptr_type = NULL;
3702 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3703 c_ptr_type = "_gfortran_iso_c_binding_c_funptr";
3705 c_ptr_type = "_gfortran_iso_c_binding_c_ptr";
3707 if(c_ptr_name == NULL)
3708 c_ptr_in = "gfc_cptr__";
3710 c_ptr_in = c_ptr_name;
3711 gfc_get_sym_tree (c_ptr_in, ns, ¶m_symtree, false);
3712 if (param_symtree != NULL)
3713 param_sym = param_symtree->n.sym;
3715 gfc_internal_error ("gen_cptr_param(): Unable to "
3716 "create symbol for %s", c_ptr_in);
3718 /* Set up the appropriate fields for the new c_ptr param sym. */
3720 param_sym->attr.flavor = FL_DERIVED;
3721 param_sym->ts.type = BT_DERIVED;
3722 param_sym->attr.intent = INTENT_IN;
3723 param_sym->attr.dummy = 1;
3725 /* This will pass the ptr to the iso_c routines as a (void *). */
3726 param_sym->attr.value = 1;
3727 param_sym->attr.use_assoc = 1;
3729 /* Get the symbol for c_ptr or c_funptr, no matter what it's name is
3731 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3732 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3734 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_PTR);
3735 if (c_ptr_sym == NULL)
3737 /* This can happen if the user did not define c_ptr but they are
3738 trying to use one of the iso_c_binding functions that need it. */
3739 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3740 generate_isocbinding_symbol (module_name, ISOCBINDING_FUNPTR,
3741 (const char *)c_ptr_type);
3743 generate_isocbinding_symbol (module_name, ISOCBINDING_PTR,
3744 (const char *)c_ptr_type);
3746 gfc_get_ha_symbol (c_ptr_type, &(c_ptr_sym));
3749 param_sym->ts.u.derived = c_ptr_sym;
3750 param_sym->module = gfc_get_string (module_name);
3752 /* Make new formal arg. */
3753 formal_arg = gfc_get_formal_arglist ();
3754 /* Add arg to list of formal args (the CPTR arg). */
3755 add_formal_arg (head, tail, formal_arg, param_sym);
3759 /* Generates a symbol representing the FPTR argument to an
3760 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3761 FPTR and add it to the provided argument list. */
3764 gen_fptr_param (gfc_formal_arglist **head,
3765 gfc_formal_arglist **tail,
3766 const char *module_name,
3767 gfc_namespace *ns, const char *f_ptr_name, int proc)
3769 gfc_symbol *param_sym = NULL;
3770 gfc_symtree *param_symtree = NULL;
3771 gfc_formal_arglist *formal_arg = NULL;
3772 const char *f_ptr_out = "gfc_fptr__";
3774 if (f_ptr_name != NULL)
3775 f_ptr_out = f_ptr_name;
3777 gfc_get_sym_tree (f_ptr_out, ns, ¶m_symtree, false);
3778 if (param_symtree != NULL)
3779 param_sym = param_symtree->n.sym;
3781 gfc_internal_error ("generateFPtrParam(): Unable to "
3782 "create symbol for %s", f_ptr_out);
3784 /* Set up the necessary fields for the fptr output param sym. */
3787 param_sym->attr.proc_pointer = 1;
3789 param_sym->attr.pointer = 1;
3790 param_sym->attr.dummy = 1;
3791 param_sym->attr.use_assoc = 1;
3793 /* ISO C Binding type to allow any pointer type as actual param. */
3794 param_sym->ts.type = BT_VOID;
3795 param_sym->module = gfc_get_string (module_name);
3798 formal_arg = gfc_get_formal_arglist ();
3799 /* Add arg to list of formal args. */
3800 add_formal_arg (head, tail, formal_arg, param_sym);
3804 /* Generates a symbol representing the optional SHAPE argument for the
3805 iso_c_binding c_f_pointer() procedure. Also, create a
3806 gfc_formal_arglist for the SHAPE and add it to the provided
3810 gen_shape_param (gfc_formal_arglist **head,
3811 gfc_formal_arglist **tail,
3812 const char *module_name,
3813 gfc_namespace *ns, const char *shape_param_name)
3815 gfc_symbol *param_sym = NULL;
3816 gfc_symtree *param_symtree = NULL;
3817 gfc_formal_arglist *formal_arg = NULL;
3818 const char *shape_param = "gfc_shape_array__";
3821 if (shape_param_name != NULL)
3822 shape_param = shape_param_name;
3824 gfc_get_sym_tree (shape_param, ns, ¶m_symtree, false);
3825 if (param_symtree != NULL)
3826 param_sym = param_symtree->n.sym;
3828 gfc_internal_error ("generateShapeParam(): Unable to "
3829 "create symbol for %s", shape_param);
3831 /* Set up the necessary fields for the shape input param sym. */
3833 param_sym->attr.dummy = 1;
3834 param_sym->attr.use_assoc = 1;
3836 /* Integer array, rank 1, describing the shape of the object. Make it's
3837 type BT_VOID initially so we can accept any type/kind combination of
3838 integer. During gfc_iso_c_sub_interface (resolve.c), we'll make it
3839 of BT_INTEGER type. */
3840 param_sym->ts.type = BT_VOID;
3842 /* Initialize the kind to default integer. However, it will be overridden
3843 during resolution to match the kind of the SHAPE parameter given as
3844 the actual argument (to allow for any valid integer kind). */
3845 param_sym->ts.kind = gfc_default_integer_kind;
3846 param_sym->as = gfc_get_array_spec ();
3848 /* Clear out the dimension info for the array. */
3849 for (i = 0; i < GFC_MAX_DIMENSIONS; i++)
3851 param_sym->as->lower[i] = NULL;
3852 param_sym->as->upper[i] = NULL;
3854 param_sym->as->rank = 1;
3855 param_sym->as->lower[0] = gfc_int_expr (1);
3857 /* The extent is unknown until we get it. The length give us
3858 the rank the incoming pointer. */
3859 param_sym->as->type = AS_ASSUMED_SHAPE;
3861 /* The arg is also optional; it is required iff the second arg
3862 (fptr) is to an array, otherwise, it's ignored. */
3863 param_sym->attr.optional = 1;
3864 param_sym->attr.intent = INTENT_IN;
3865 param_sym->attr.dimension = 1;
3866 param_sym->module = gfc_get_string (module_name);
3869 formal_arg = gfc_get_formal_arglist ();
3870 /* Add arg to list of formal args. */
3871 add_formal_arg (head, tail, formal_arg, param_sym);
3875 /* Add a procedure interface to the given symbol (i.e., store a
3876 reference to the list of formal arguments). */
3879 add_proc_interface (gfc_symbol *sym, ifsrc source,
3880 gfc_formal_arglist *formal)
3883 sym->formal = formal;
3884 sym->attr.if_source = source;
3888 /* Copy the formal args from an existing symbol, src, into a new
3889 symbol, dest. New formal args are created, and the description of
3890 each arg is set according to the existing ones. This function is
3891 used when creating procedure declaration variables from a procedure
3892 declaration statement (see match_proc_decl()) to create the formal
3893 args based on the args of a given named interface. */
3896 gfc_copy_formal_args (gfc_symbol *dest, gfc_symbol *src)
3898 gfc_formal_arglist *head = NULL;
3899 gfc_formal_arglist *tail = NULL;
3900 gfc_formal_arglist *formal_arg = NULL;
3901 gfc_formal_arglist *curr_arg = NULL;
3902 gfc_formal_arglist *formal_prev = NULL;
3903 /* Save current namespace so we can change it for formal args. */
3904 gfc_namespace *parent_ns = gfc_current_ns;
3906 /* Create a new namespace, which will be the formal ns (namespace
3907 of the formal args). */
3908 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
3909 gfc_current_ns->proc_name = dest;
3911 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
3913 formal_arg = gfc_get_formal_arglist ();
3914 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
3916 /* May need to copy more info for the symbol. */
3917 formal_arg->sym->attr = curr_arg->sym->attr;
3918 formal_arg->sym->ts = curr_arg->sym->ts;
3919 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
3920 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
3922 /* If this isn't the first arg, set up the next ptr. For the
3923 last arg built, the formal_arg->next will never get set to
3924 anything other than NULL. */
3925 if (formal_prev != NULL)
3926 formal_prev->next = formal_arg;
3928 formal_arg->next = NULL;
3930 formal_prev = formal_arg;
3932 /* Add arg to list of formal args. */
3933 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
3936 /* Add the interface to the symbol. */
3937 add_proc_interface (dest, IFSRC_DECL, head);
3939 /* Store the formal namespace information. */
3940 if (dest->formal != NULL)
3941 /* The current ns should be that for the dest proc. */
3942 dest->formal_ns = gfc_current_ns;
3943 /* Restore the current namespace to what it was on entry. */
3944 gfc_current_ns = parent_ns;
3949 gfc_copy_formal_args_intr (gfc_symbol *dest, gfc_intrinsic_sym *src)
3951 gfc_formal_arglist *head = NULL;
3952 gfc_formal_arglist *tail = NULL;
3953 gfc_formal_arglist *formal_arg = NULL;
3954 gfc_intrinsic_arg *curr_arg = NULL;
3955 gfc_formal_arglist *formal_prev = NULL;
3956 /* Save current namespace so we can change it for formal args. */
3957 gfc_namespace *parent_ns = gfc_current_ns;
3959 /* Create a new namespace, which will be the formal ns (namespace
3960 of the formal args). */
3961 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
3962 gfc_current_ns->proc_name = dest;
3964 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
3966 formal_arg = gfc_get_formal_arglist ();
3967 gfc_get_symbol (curr_arg->name, gfc_current_ns, &(formal_arg->sym));
3969 /* May need to copy more info for the symbol. */
3970 formal_arg->sym->ts = curr_arg->ts;
3971 formal_arg->sym->attr.optional = curr_arg->optional;
3972 formal_arg->sym->attr.intent = curr_arg->intent;
3973 formal_arg->sym->attr.flavor = FL_VARIABLE;
3974 formal_arg->sym->attr.dummy = 1;
3976 if (formal_arg->sym->ts.type == BT_CHARACTER)
3977 formal_arg->sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
3979 /* If this isn't the first arg, set up the next ptr. For the
3980 last arg built, the formal_arg->next will never get set to
3981 anything other than NULL. */
3982 if (formal_prev != NULL)
3983 formal_prev->next = formal_arg;
3985 formal_arg->next = NULL;
3987 formal_prev = formal_arg;
3989 /* Add arg to list of formal args. */
3990 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
3993 /* Add the interface to the symbol. */
3994 add_proc_interface (dest, IFSRC_DECL, head);
3996 /* Store the formal namespace information. */
3997 if (dest->formal != NULL)
3998 /* The current ns should be that for the dest proc. */
3999 dest->formal_ns = gfc_current_ns;
4000 /* Restore the current namespace to what it was on entry. */
4001 gfc_current_ns = parent_ns;
4006 gfc_copy_formal_args_ppc (gfc_component *dest, gfc_symbol *src)
4008 gfc_formal_arglist *head = NULL;
4009 gfc_formal_arglist *tail = NULL;
4010 gfc_formal_arglist *formal_arg = NULL;
4011 gfc_formal_arglist *curr_arg = NULL;
4012 gfc_formal_arglist *formal_prev = NULL;
4013 /* Save current namespace so we can change it for formal args. */
4014 gfc_namespace *parent_ns = gfc_current_ns;
4016 /* Create a new namespace, which will be the formal ns (namespace
4017 of the formal args). */
4018 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4019 /* TODO: gfc_current_ns->proc_name = dest;*/
4021 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4023 formal_arg = gfc_get_formal_arglist ();
4024 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4026 /* May need to copy more info for the symbol. */
4027 formal_arg->sym->attr = curr_arg->sym->attr;
4028 formal_arg->sym->ts = curr_arg->sym->ts;
4029 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4030 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
4032 /* If this isn't the first arg, set up the next ptr. For the
4033 last arg built, the formal_arg->next will never get set to
4034 anything other than NULL. */
4035 if (formal_prev != NULL)
4036 formal_prev->next = formal_arg;
4038 formal_arg->next = NULL;
4040 formal_prev = formal_arg;
4042 /* Add arg to list of formal args. */
4043 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4046 /* Add the interface to the symbol. */
4047 dest->formal = head;
4048 dest->attr.if_source = IFSRC_DECL;
4050 /* Store the formal namespace information. */
4051 if (dest->formal != NULL)
4052 /* The current ns should be that for the dest proc. */
4053 dest->formal_ns = gfc_current_ns;
4054 /* Restore the current namespace to what it was on entry. */
4055 gfc_current_ns = parent_ns;
4059 /* Builds the parameter list for the iso_c_binding procedure
4060 c_f_pointer or c_f_procpointer. The old_sym typically refers to a
4061 generic version of either the c_f_pointer or c_f_procpointer
4062 functions. The new_proc_sym represents a "resolved" version of the
4063 symbol. The functions are resolved to match the types of their
4064 parameters; for example, c_f_pointer(cptr, fptr) would resolve to
4065 something similar to c_f_pointer_i4 if the type of data object fptr
4066 pointed to was a default integer. The actual name of the resolved
4067 procedure symbol is further mangled with the module name, etc., but
4068 the idea holds true. */
4071 build_formal_args (gfc_symbol *new_proc_sym,
4072 gfc_symbol *old_sym, int add_optional_arg)
4074 gfc_formal_arglist *head = NULL, *tail = NULL;
4075 gfc_namespace *parent_ns = NULL;
4077 parent_ns = gfc_current_ns;
4078 /* Create a new namespace, which will be the formal ns (namespace
4079 of the formal args). */
4080 gfc_current_ns = gfc_get_namespace(parent_ns, 0);
4081 gfc_current_ns->proc_name = new_proc_sym;
4083 /* Generate the params. */
4084 if (old_sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER)
4086 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4087 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4088 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4089 gfc_current_ns, "fptr", 1);
4091 else if (old_sym->intmod_sym_id == ISOCBINDING_F_POINTER)
4093 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4094 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4095 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4096 gfc_current_ns, "fptr", 0);
4097 /* If we're dealing with c_f_pointer, it has an optional third arg. */
4098 gen_shape_param (&head, &tail,(const char *) new_proc_sym->module,
4099 gfc_current_ns, "shape");
4102 else if (old_sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
4104 /* c_associated has one required arg and one optional; both
4106 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4107 gfc_current_ns, "c_ptr_1", ISOCBINDING_ASSOCIATED);
4108 if (add_optional_arg)
4110 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4111 gfc_current_ns, "c_ptr_2", ISOCBINDING_ASSOCIATED);
4112 /* The last param is optional so mark it as such. */
4113 tail->sym->attr.optional = 1;
4117 /* Add the interface (store formal args to new_proc_sym). */
4118 add_proc_interface (new_proc_sym, IFSRC_DECL, head);
4120 /* Set up the formal_ns pointer to the one created for the
4121 new procedure so it'll get cleaned up during gfc_free_symbol(). */
4122 new_proc_sym->formal_ns = gfc_current_ns;
4124 gfc_current_ns = parent_ns;
4128 std_for_isocbinding_symbol (int id)
4132 #define NAMED_INTCST(a,b,c,d) \
4135 #include "iso-c-binding.def"
4138 return GFC_STD_F2003;
4142 /* Generate the given set of C interoperable kind objects, or all
4143 interoperable kinds. This function will only be given kind objects
4144 for valid iso_c_binding defined types because this is verified when
4145 the 'use' statement is parsed. If the user gives an 'only' clause,
4146 the specific kinds are looked up; if they don't exist, an error is
4147 reported. If the user does not give an 'only' clause, all
4148 iso_c_binding symbols are generated. If a list of specific kinds
4149 is given, it must have a NULL in the first empty spot to mark the
4154 generate_isocbinding_symbol (const char *mod_name, iso_c_binding_symbol s,
4155 const char *local_name)
4157 const char *const name = (local_name && local_name[0]) ? local_name
4158 : c_interop_kinds_table[s].name;
4159 gfc_symtree *tmp_symtree = NULL;
4160 gfc_symbol *tmp_sym = NULL;
4161 gfc_dt_list **dt_list_ptr = NULL;
4162 gfc_component *tmp_comp = NULL;
4163 char comp_name[(GFC_MAX_SYMBOL_LEN * 2) + 1];
4166 if (gfc_notification_std (std_for_isocbinding_symbol (s)) == ERROR)
4168 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, name);
4170 /* Already exists in this scope so don't re-add it.
4171 TODO: we should probably check that it's really the same symbol. */
4172 if (tmp_symtree != NULL)
4175 /* Create the sym tree in the current ns. */
4176 gfc_get_sym_tree (name, gfc_current_ns, &tmp_symtree, false);
4178 tmp_sym = tmp_symtree->n.sym;
4180 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4183 /* Say what module this symbol belongs to. */
4184 tmp_sym->module = gfc_get_string (mod_name);
4185 tmp_sym->from_intmod = INTMOD_ISO_C_BINDING;
4186 tmp_sym->intmod_sym_id = s;
4191 #define NAMED_INTCST(a,b,c,d) case a :
4192 #define NAMED_REALCST(a,b,c) case a :
4193 #define NAMED_CMPXCST(a,b,c) case a :
4194 #define NAMED_LOGCST(a,b,c) case a :
4195 #define NAMED_CHARKNDCST(a,b,c) case a :
4196 #include "iso-c-binding.def"
4198 tmp_sym->value = gfc_int_expr (c_interop_kinds_table[s].value);
4200 /* Initialize an integer constant expression node. */
4201 tmp_sym->attr.flavor = FL_PARAMETER;
4202 tmp_sym->ts.type = BT_INTEGER;
4203 tmp_sym->ts.kind = gfc_default_integer_kind;
4205 /* Mark this type as a C interoperable one. */
4206 tmp_sym->ts.is_c_interop = 1;
4207 tmp_sym->ts.is_iso_c = 1;
4208 tmp_sym->value->ts.is_c_interop = 1;
4209 tmp_sym->value->ts.is_iso_c = 1;
4210 tmp_sym->attr.is_c_interop = 1;
4212 /* Tell what f90 type this c interop kind is valid. */
4213 tmp_sym->ts.f90_type = c_interop_kinds_table[s].f90_type;
4215 /* Say it's from the iso_c_binding module. */
4216 tmp_sym->attr.is_iso_c = 1;
4218 /* Make it use associated. */
4219 tmp_sym->attr.use_assoc = 1;
4223 #define NAMED_CHARCST(a,b,c) case a :
4224 #include "iso-c-binding.def"
4226 /* Initialize an integer constant expression node for the
4227 length of the character. */
4228 tmp_sym->value = gfc_get_expr ();
4229 tmp_sym->value->expr_type = EXPR_CONSTANT;
4230 tmp_sym->value->ts.type = BT_CHARACTER;
4231 tmp_sym->value->ts.kind = gfc_default_character_kind;
4232 tmp_sym->value->where = gfc_current_locus;
4233 tmp_sym->value->ts.is_c_interop = 1;
4234 tmp_sym->value->ts.is_iso_c = 1;
4235 tmp_sym->value->value.character.length = 1;
4236 tmp_sym->value->value.character.string = gfc_get_wide_string (2);
4237 tmp_sym->value->value.character.string[0]
4238 = (gfc_char_t) c_interop_kinds_table[s].value;
4239 tmp_sym->value->value.character.string[1] = '\0';
4240 tmp_sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4241 tmp_sym->ts.u.cl->length = gfc_int_expr (1);
4243 /* May not need this in both attr and ts, but do need in
4244 attr for writing module file. */
4245 tmp_sym->attr.is_c_interop = 1;
4247 tmp_sym->attr.flavor = FL_PARAMETER;
4248 tmp_sym->ts.type = BT_CHARACTER;
4250 /* Need to set it to the C_CHAR kind. */
4251 tmp_sym->ts.kind = gfc_default_character_kind;
4253 /* Mark this type as a C interoperable one. */
4254 tmp_sym->ts.is_c_interop = 1;
4255 tmp_sym->ts.is_iso_c = 1;
4257 /* Tell what f90 type this c interop kind is valid. */
4258 tmp_sym->ts.f90_type = BT_CHARACTER;
4260 /* Say it's from the iso_c_binding module. */
4261 tmp_sym->attr.is_iso_c = 1;
4263 /* Make it use associated. */
4264 tmp_sym->attr.use_assoc = 1;
4267 case ISOCBINDING_PTR:
4268 case ISOCBINDING_FUNPTR:
4270 /* Initialize an integer constant expression node. */
4271 tmp_sym->attr.flavor = FL_DERIVED;
4272 tmp_sym->ts.is_c_interop = 1;
4273 tmp_sym->attr.is_c_interop = 1;
4274 tmp_sym->attr.is_iso_c = 1;
4275 tmp_sym->ts.is_iso_c = 1;
4276 tmp_sym->ts.type = BT_DERIVED;
4278 /* A derived type must have the bind attribute to be
4279 interoperable (J3/04-007, Section 15.2.3), even though
4280 the binding label is not used. */
4281 tmp_sym->attr.is_bind_c = 1;
4283 tmp_sym->attr.referenced = 1;
4285 tmp_sym->ts.u.derived = tmp_sym;
4287 /* Add the symbol created for the derived type to the current ns. */
4288 dt_list_ptr = &(gfc_derived_types);
4289 while (*dt_list_ptr != NULL && (*dt_list_ptr)->next != NULL)
4290 dt_list_ptr = &((*dt_list_ptr)->next);
4292 /* There is already at least one derived type in the list, so append
4293 the one we're currently building for c_ptr or c_funptr. */
4294 if (*dt_list_ptr != NULL)
4295 dt_list_ptr = &((*dt_list_ptr)->next);
4296 (*dt_list_ptr) = gfc_get_dt_list ();
4297 (*dt_list_ptr)->derived = tmp_sym;
4298 (*dt_list_ptr)->next = NULL;
4300 /* Set up the component of the derived type, which will be
4301 an integer with kind equal to c_ptr_size. Mangle the name of
4302 the field for the c_address to prevent the curious user from
4303 trying to access it from Fortran. */
4304 sprintf (comp_name, "__%s_%s", tmp_sym->name, "c_address");
4305 gfc_add_component (tmp_sym, comp_name, &tmp_comp);
4306 if (tmp_comp == NULL)
4307 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4308 "create component for c_address");
4310 tmp_comp->ts.type = BT_INTEGER;
4312 /* Set this because the module will need to read/write this field. */
4313 tmp_comp->ts.f90_type = BT_INTEGER;
4315 /* The kinds for c_ptr and c_funptr are the same. */
4316 index = get_c_kind ("c_ptr", c_interop_kinds_table);
4317 tmp_comp->ts.kind = c_interop_kinds_table[index].value;
4319 tmp_comp->attr.pointer = 0;
4320 tmp_comp->attr.dimension = 0;
4322 /* Mark the component as C interoperable. */
4323 tmp_comp->ts.is_c_interop = 1;
4325 /* Make it use associated (iso_c_binding module). */
4326 tmp_sym->attr.use_assoc = 1;
4329 case ISOCBINDING_NULL_PTR:
4330 case ISOCBINDING_NULL_FUNPTR:
4331 gen_special_c_interop_ptr (s, name, mod_name);
4334 case ISOCBINDING_F_POINTER:
4335 case ISOCBINDING_ASSOCIATED:
4336 case ISOCBINDING_LOC:
4337 case ISOCBINDING_FUNLOC:
4338 case ISOCBINDING_F_PROCPOINTER:
4340 tmp_sym->attr.proc = PROC_MODULE;
4342 /* Use the procedure's name as it is in the iso_c_binding module for
4343 setting the binding label in case the user renamed the symbol. */
4344 sprintf (tmp_sym->binding_label, "%s_%s", mod_name,
4345 c_interop_kinds_table[s].name);
4346 tmp_sym->attr.is_iso_c = 1;
4347 if (s == ISOCBINDING_F_POINTER || s == ISOCBINDING_F_PROCPOINTER)
4348 tmp_sym->attr.subroutine = 1;
4351 /* TODO! This needs to be finished more for the expr of the
4352 function or something!
4353 This may not need to be here, because trying to do c_loc
4355 if (s == ISOCBINDING_ASSOCIATED)
4357 tmp_sym->attr.function = 1;
4358 tmp_sym->ts.type = BT_LOGICAL;
4359 tmp_sym->ts.kind = gfc_default_logical_kind;
4360 tmp_sym->result = tmp_sym;
4364 /* Here, we're taking the simple approach. We're defining
4365 c_loc as an external identifier so the compiler will put
4366 what we expect on the stack for the address we want the
4368 tmp_sym->ts.type = BT_DERIVED;
4369 if (s == ISOCBINDING_LOC)
4370 tmp_sym->ts.u.derived =
4371 get_iso_c_binding_dt (ISOCBINDING_PTR);
4373 tmp_sym->ts.u.derived =
4374 get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
4376 if (tmp_sym->ts.u.derived == NULL)
4378 /* Create the necessary derived type so we can continue
4379 processing the file. */
4380 generate_isocbinding_symbol
4381 (mod_name, s == ISOCBINDING_FUNLOC
4382 ? ISOCBINDING_FUNPTR : ISOCBINDING_PTR,
4383 (const char *)(s == ISOCBINDING_FUNLOC
4384 ? "_gfortran_iso_c_binding_c_funptr"
4385 : "_gfortran_iso_c_binding_c_ptr"));
4386 tmp_sym->ts.u.derived =
4387 get_iso_c_binding_dt (s == ISOCBINDING_FUNLOC
4388 ? ISOCBINDING_FUNPTR
4392 /* The function result is itself (no result clause). */
4393 tmp_sym->result = tmp_sym;
4394 tmp_sym->attr.external = 1;
4395 tmp_sym->attr.use_assoc = 0;
4396 tmp_sym->attr.pure = 1;
4397 tmp_sym->attr.if_source = IFSRC_UNKNOWN;
4398 tmp_sym->attr.proc = PROC_UNKNOWN;
4402 tmp_sym->attr.flavor = FL_PROCEDURE;
4403 tmp_sym->attr.contained = 0;
4405 /* Try using this builder routine, with the new and old symbols
4406 both being the generic iso_c proc sym being created. This
4407 will create the formal args (and the new namespace for them).
4408 Don't build an arg list for c_loc because we're going to treat
4409 c_loc as an external procedure. */
4410 if (s != ISOCBINDING_LOC && s != ISOCBINDING_FUNLOC)
4411 /* The 1 says to add any optional args, if applicable. */
4412 build_formal_args (tmp_sym, tmp_sym, 1);
4414 /* Set this after setting up the symbol, to prevent error messages. */
4415 tmp_sym->attr.use_assoc = 1;
4417 /* This symbol will not be referenced directly. It will be
4418 resolved to the implementation for the given f90 kind. */
4419 tmp_sym->attr.referenced = 0;
4429 /* Creates a new symbol based off of an old iso_c symbol, with a new
4430 binding label. This function can be used to create a new,
4431 resolved, version of a procedure symbol for c_f_pointer or
4432 c_f_procpointer that is based on the generic symbols. A new
4433 parameter list is created for the new symbol using
4434 build_formal_args(). The add_optional_flag specifies whether the
4435 to add the optional SHAPE argument. The new symbol is
4439 get_iso_c_sym (gfc_symbol *old_sym, char *new_name,
4440 char *new_binding_label, int add_optional_arg)
4442 gfc_symtree *new_symtree = NULL;
4444 /* See if we have a symbol by that name already available, looking
4445 through any parent namespaces. */
4446 gfc_find_sym_tree (new_name, gfc_current_ns, 1, &new_symtree);
4447 if (new_symtree != NULL)
4448 /* Return the existing symbol. */
4449 return new_symtree->n.sym;
4451 /* Create the symtree/symbol, with attempted host association. */
4452 gfc_get_ha_sym_tree (new_name, &new_symtree);
4453 if (new_symtree == NULL)
4454 gfc_internal_error ("get_iso_c_sym(): Unable to create "
4455 "symtree for '%s'", new_name);
4457 /* Now fill in the fields of the resolved symbol with the old sym. */
4458 strcpy (new_symtree->n.sym->binding_label, new_binding_label);
4459 new_symtree->n.sym->attr = old_sym->attr;
4460 new_symtree->n.sym->ts = old_sym->ts;
4461 new_symtree->n.sym->module = gfc_get_string (old_sym->module);
4462 new_symtree->n.sym->from_intmod = old_sym->from_intmod;
4463 new_symtree->n.sym->intmod_sym_id = old_sym->intmod_sym_id;
4464 /* Build the formal arg list. */
4465 build_formal_args (new_symtree->n.sym, old_sym, add_optional_arg);
4467 gfc_commit_symbol (new_symtree->n.sym);
4469 return new_symtree->n.sym;
4473 /* Check that a symbol is already typed. If strict is not set, an untyped
4474 symbol is acceptable for non-standard-conforming mode. */
4477 gfc_check_symbol_typed (gfc_symbol* sym, gfc_namespace* ns,
4478 bool strict, locus where)
4482 if (gfc_matching_prefix)
4485 /* Check for the type and try to give it an implicit one. */
4486 if (sym->ts.type == BT_UNKNOWN
4487 && gfc_set_default_type (sym, 0, ns) == FAILURE)
4491 gfc_error ("Symbol '%s' is used before it is typed at %L",
4496 if (gfc_notify_std (GFC_STD_GNU,
4497 "Extension: Symbol '%s' is used before"
4498 " it is typed at %L", sym->name, &where) == FAILURE)
4502 /* Everything is ok. */
4507 /* Construct a typebound-procedure structure. Those are stored in a tentative
4508 list and marked `error' until symbols are committed. */
4511 gfc_get_typebound_proc (void)
4513 gfc_typebound_proc *result;
4514 tentative_tbp *list_node;
4516 result = XCNEW (gfc_typebound_proc);
4519 list_node = XCNEW (tentative_tbp);
4520 list_node->next = tentative_tbp_list;
4521 list_node->proc = result;
4522 tentative_tbp_list = list_node;
4528 /* Get the super-type of a given derived type. */
4531 gfc_get_derived_super_type (gfc_symbol* derived)
4533 if (!derived->attr.extension)
4536 gcc_assert (derived->components);
4537 gcc_assert (derived->components->ts.type == BT_DERIVED);
4538 gcc_assert (derived->components->ts.u.derived);
4540 return derived->components->ts.u.derived;
4544 /* Get the ultimate super-type of a given derived type. */
4547 gfc_get_ultimate_derived_super_type (gfc_symbol* derived)
4549 if (!derived->attr.extension)
4552 derived = gfc_get_derived_super_type (derived);
4554 if (derived->attr.extension)
4555 return gfc_get_ultimate_derived_super_type (derived);
4561 /* Check if a derived type t2 is an extension of (or equal to) a type t1. */
4564 gfc_type_is_extension_of (gfc_symbol *t1, gfc_symbol *t2)
4566 while (!gfc_compare_derived_types (t1, t2) && t2->attr.extension)
4567 t2 = gfc_get_derived_super_type (t2);
4568 return gfc_compare_derived_types (t1, t2);
4572 /* Check if two typespecs are type compatible (F03:5.1.1.2):
4573 If ts1 is nonpolymorphic, ts2 must be the same type.
4574 If ts1 is polymorphic (CLASS), ts2 must be an extension of ts1. */
4577 gfc_type_compatible (gfc_typespec *ts1, gfc_typespec *ts2)
4579 if ((ts1->type == BT_DERIVED || ts1->type == BT_CLASS)
4580 && (ts2->type == BT_DERIVED || ts2->type == BT_CLASS))
4582 if (ts1->type == BT_CLASS && ts2->type == BT_DERIVED)
4583 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4585 else if (ts1->type == BT_CLASS && ts2->type == BT_CLASS)
4586 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4587 ts2->u.derived->components->ts.u.derived);
4588 else if (ts2->type != BT_CLASS)
4589 return gfc_compare_derived_types (ts1->u.derived, ts2->u.derived);
4594 return (ts1->type == ts2->type);
4598 /* General worker function to find either a type-bound procedure or a
4599 type-bound user operator. */
4602 find_typebound_proc_uop (gfc_symbol* derived, gfc_try* t,
4603 const char* name, bool noaccess, bool uop,
4609 /* Set correct symbol-root. */
4610 gcc_assert (derived->f2k_derived);
4611 root = (uop ? derived->f2k_derived->tb_uop_root
4612 : derived->f2k_derived->tb_sym_root);
4614 /* Set default to failure. */
4618 /* Try to find it in the current type's namespace. */
4619 res = gfc_find_symtree (root, name);
4620 if (res && res->n.tb && !res->n.tb->error)
4626 if (!noaccess && derived->attr.use_assoc
4627 && res->n.tb->access == ACCESS_PRIVATE)
4630 gfc_error ("'%s' of '%s' is PRIVATE at %L",
4631 name, derived->name, where);
4639 /* Otherwise, recurse on parent type if derived is an extension. */
4640 if (derived->attr.extension)
4642 gfc_symbol* super_type;
4643 super_type = gfc_get_derived_super_type (derived);
4644 gcc_assert (super_type);
4646 return find_typebound_proc_uop (super_type, t, name,
4647 noaccess, uop, where);
4650 /* Nothing found. */
4655 /* Find a type-bound procedure or user operator by name for a derived-type
4656 (looking recursively through the super-types). */
4659 gfc_find_typebound_proc (gfc_symbol* derived, gfc_try* t,
4660 const char* name, bool noaccess, locus* where)
4662 return find_typebound_proc_uop (derived, t, name, noaccess, false, where);
4666 gfc_find_typebound_user_op (gfc_symbol* derived, gfc_try* t,
4667 const char* name, bool noaccess, locus* where)
4669 return find_typebound_proc_uop (derived, t, name, noaccess, true, where);
4673 /* Find a type-bound intrinsic operator looking recursively through the
4674 super-type hierarchy. */
4677 gfc_find_typebound_intrinsic_op (gfc_symbol* derived, gfc_try* t,
4678 gfc_intrinsic_op op, bool noaccess,
4681 gfc_typebound_proc* res;
4683 /* Set default to failure. */
4687 /* Try to find it in the current type's namespace. */
4688 if (derived->f2k_derived)
4689 res = derived->f2k_derived->tb_op[op];
4694 if (res && !res->error)
4700 if (!noaccess && derived->attr.use_assoc
4701 && res->access == ACCESS_PRIVATE)
4704 gfc_error ("'%s' of '%s' is PRIVATE at %L",
4705 gfc_op2string (op), derived->name, where);
4713 /* Otherwise, recurse on parent type if derived is an extension. */
4714 if (derived->attr.extension)
4716 gfc_symbol* super_type;
4717 super_type = gfc_get_derived_super_type (derived);
4718 gcc_assert (super_type);
4720 return gfc_find_typebound_intrinsic_op (super_type, t, op,
4724 /* Nothing found. */
4729 /* Get a typebound-procedure symtree or create and insert it if not yet
4730 present. This is like a very simplified version of gfc_get_sym_tree for
4731 tbp-symtrees rather than regular ones. */
4734 gfc_get_tbp_symtree (gfc_symtree **root, const char *name)
4736 gfc_symtree *result;
4738 result = gfc_find_symtree (*root, name);
4741 result = gfc_new_symtree (root, name);
4742 gcc_assert (result);
4743 result->n.tb = NULL;