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 /* If we're in a SELECT TYPE block, check if the variable 'st' matches any
2465 selector on the stack. If yes, replace it by the corresponding temporary. */
2468 select_type_insert_tmp (gfc_symtree **st)
2470 gfc_select_type_stack *stack = select_type_stack;
2471 for (; stack; stack = stack->prev)
2472 if ((*st)->n.sym == stack->selector)
2477 /* Search for a symtree starting in the current namespace, resorting to
2478 any parent namespaces if requested by a nonzero parent_flag.
2479 Returns nonzero if the name is ambiguous. */
2482 gfc_find_sym_tree (const char *name, gfc_namespace *ns, int parent_flag,
2483 gfc_symtree **result)
2488 ns = gfc_current_ns;
2492 st = gfc_find_symtree (ns->sym_root, name);
2495 select_type_insert_tmp (&st);
2498 /* Ambiguous generic interfaces are permitted, as long
2499 as the specific interfaces are different. */
2500 if (st->ambiguous && !st->n.sym->attr.generic)
2502 ambiguous_symbol (name, st);
2521 /* Same, but returns the symbol instead. */
2524 gfc_find_symbol (const char *name, gfc_namespace *ns, int parent_flag,
2525 gfc_symbol **result)
2530 i = gfc_find_sym_tree (name, ns, parent_flag, &st);
2535 *result = st->n.sym;
2541 /* Save symbol with the information necessary to back it out. */
2544 save_symbol_data (gfc_symbol *sym)
2547 if (sym->gfc_new || sym->old_symbol != NULL)
2550 sym->old_symbol = XCNEW (gfc_symbol);
2551 *(sym->old_symbol) = *sym;
2553 sym->tlink = changed_syms;
2558 /* Given a name, find a symbol, or create it if it does not exist yet
2559 in the current namespace. If the symbol is found we make sure that
2562 The integer return code indicates
2564 1 The symbol name was ambiguous
2565 2 The name meant to be established was already host associated.
2567 So if the return value is nonzero, then an error was issued. */
2570 gfc_get_sym_tree (const char *name, gfc_namespace *ns, gfc_symtree **result,
2571 bool allow_subroutine)
2576 /* This doesn't usually happen during resolution. */
2578 ns = gfc_current_ns;
2580 /* Try to find the symbol in ns. */
2581 st = gfc_find_symtree (ns->sym_root, name);
2585 /* If not there, create a new symbol. */
2586 p = gfc_new_symbol (name, ns);
2588 /* Add to the list of tentative symbols. */
2589 p->old_symbol = NULL;
2590 p->tlink = changed_syms;
2595 st = gfc_new_symtree (&ns->sym_root, name);
2602 /* Make sure the existing symbol is OK. Ambiguous
2603 generic interfaces are permitted, as long as the
2604 specific interfaces are different. */
2605 if (st->ambiguous && !st->n.sym->attr.generic)
2607 ambiguous_symbol (name, st);
2612 if (p->ns != ns && (!p->attr.function || ns->proc_name != p)
2613 && !(allow_subroutine && p->attr.subroutine)
2614 && !(ns->proc_name && ns->proc_name->attr.if_source == IFSRC_IFBODY
2615 && (ns->has_import_set || p->attr.imported)))
2617 /* Symbol is from another namespace. */
2618 gfc_error ("Symbol '%s' at %C has already been host associated",
2625 /* Copy in case this symbol is changed. */
2626 save_symbol_data (p);
2635 gfc_get_symbol (const char *name, gfc_namespace *ns, gfc_symbol **result)
2640 i = gfc_get_sym_tree (name, ns, &st, false);
2645 *result = st->n.sym;
2652 /* Subroutine that searches for a symbol, creating it if it doesn't
2653 exist, but tries to host-associate the symbol if possible. */
2656 gfc_get_ha_sym_tree (const char *name, gfc_symtree **result)
2661 i = gfc_find_sym_tree (name, gfc_current_ns, 0, &st);
2665 save_symbol_data (st->n.sym);
2670 if (gfc_current_ns->parent != NULL)
2672 i = gfc_find_sym_tree (name, gfc_current_ns->parent, 1, &st);
2683 return gfc_get_sym_tree (name, gfc_current_ns, result, false);
2688 gfc_get_ha_symbol (const char *name, gfc_symbol **result)
2693 i = gfc_get_ha_sym_tree (name, &st);
2696 *result = st->n.sym;
2703 /* Return true if both symbols could refer to the same data object. Does
2704 not take account of aliasing due to equivalence statements. */
2707 gfc_symbols_could_alias (gfc_symbol *lsym, gfc_symbol *rsym)
2709 /* Aliasing isn't possible if the symbols have different base types. */
2710 if (gfc_compare_types (&lsym->ts, &rsym->ts) == 0)
2713 /* Pointers can point to other pointers, target objects and allocatable
2714 objects. Two allocatable objects cannot share the same storage. */
2715 if (lsym->attr.pointer
2716 && (rsym->attr.pointer || rsym->attr.allocatable || rsym->attr.target))
2718 if (lsym->attr.target && rsym->attr.pointer)
2720 if (lsym->attr.allocatable && rsym->attr.pointer)
2727 /* Undoes all the changes made to symbols in the current statement.
2728 This subroutine is made simpler due to the fact that attributes are
2729 never removed once added. */
2732 gfc_undo_symbols (void)
2734 gfc_symbol *p, *q, *old;
2735 tentative_tbp *tbp, *tbq;
2737 for (p = changed_syms; p; p = q)
2743 /* Symbol was new. */
2744 if (p->attr.in_common && p->common_block->head)
2746 /* If the symbol was added to any common block, it
2747 needs to be removed to stop the resolver looking
2748 for a (possibly) dead symbol. */
2750 if (p->common_block->head == p)
2751 p->common_block->head = p->common_next;
2754 gfc_symbol *cparent, *csym;
2756 cparent = p->common_block->head;
2757 csym = cparent->common_next;
2762 csym = csym->common_next;
2765 gcc_assert(cparent->common_next == p);
2767 cparent->common_next = csym->common_next;
2771 gfc_delete_symtree (&p->ns->sym_root, p->name);
2775 gfc_internal_error ("gfc_undo_symbols(): Negative refs");
2777 gfc_free_symbol (p);
2781 /* Restore previous state of symbol. Just copy simple stuff. */
2783 old = p->old_symbol;
2785 p->ts.type = old->ts.type;
2786 p->ts.kind = old->ts.kind;
2788 p->attr = old->attr;
2790 if (p->value != old->value)
2792 gfc_free_expr (old->value);
2796 if (p->as != old->as)
2799 gfc_free_array_spec (p->as);
2803 p->generic = old->generic;
2804 p->component_access = old->component_access;
2806 if (p->namelist != NULL && old->namelist == NULL)
2808 gfc_free_namelist (p->namelist);
2813 if (p->namelist_tail != old->namelist_tail)
2815 gfc_free_namelist (old->namelist_tail);
2816 old->namelist_tail->next = NULL;
2820 p->namelist_tail = old->namelist_tail;
2822 if (p->formal != old->formal)
2824 gfc_free_formal_arglist (p->formal);
2825 p->formal = old->formal;
2828 gfc_free (p->old_symbol);
2829 p->old_symbol = NULL;
2833 changed_syms = NULL;
2835 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
2838 /* Procedure is already marked `error' by default. */
2841 tentative_tbp_list = NULL;
2845 /* Free sym->old_symbol. sym->old_symbol is mostly a shallow copy of sym; the
2846 components of old_symbol that might need deallocation are the "allocatables"
2847 that are restored in gfc_undo_symbols(), with two exceptions: namelist and
2848 namelist_tail. In case these differ between old_symbol and sym, it's just
2849 because sym->namelist has gotten a few more items. */
2852 free_old_symbol (gfc_symbol *sym)
2855 if (sym->old_symbol == NULL)
2858 if (sym->old_symbol->as != sym->as)
2859 gfc_free_array_spec (sym->old_symbol->as);
2861 if (sym->old_symbol->value != sym->value)
2862 gfc_free_expr (sym->old_symbol->value);
2864 if (sym->old_symbol->formal != sym->formal)
2865 gfc_free_formal_arglist (sym->old_symbol->formal);
2867 gfc_free (sym->old_symbol);
2868 sym->old_symbol = NULL;
2872 /* Makes the changes made in the current statement permanent-- gets
2873 rid of undo information. */
2876 gfc_commit_symbols (void)
2879 tentative_tbp *tbp, *tbq;
2881 for (p = changed_syms; p; p = q)
2887 free_old_symbol (p);
2889 changed_syms = NULL;
2891 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
2894 tbp->proc->error = 0;
2897 tentative_tbp_list = NULL;
2901 /* Makes the changes made in one symbol permanent -- gets rid of undo
2905 gfc_commit_symbol (gfc_symbol *sym)
2909 if (changed_syms == sym)
2910 changed_syms = sym->tlink;
2913 for (p = changed_syms; p; p = p->tlink)
2914 if (p->tlink == sym)
2916 p->tlink = sym->tlink;
2925 free_old_symbol (sym);
2929 /* Recursively free trees containing type-bound procedures. */
2932 free_tb_tree (gfc_symtree *t)
2937 free_tb_tree (t->left);
2938 free_tb_tree (t->right);
2940 /* TODO: Free type-bound procedure structs themselves; probably needs some
2941 sort of ref-counting mechanism. */
2947 /* Recursive function that deletes an entire tree and all the common
2948 head structures it points to. */
2951 free_common_tree (gfc_symtree * common_tree)
2953 if (common_tree == NULL)
2956 free_common_tree (common_tree->left);
2957 free_common_tree (common_tree->right);
2959 gfc_free (common_tree);
2963 /* Recursive function that deletes an entire tree and all the user
2964 operator nodes that it contains. */
2967 free_uop_tree (gfc_symtree *uop_tree)
2969 if (uop_tree == NULL)
2972 free_uop_tree (uop_tree->left);
2973 free_uop_tree (uop_tree->right);
2975 gfc_free_interface (uop_tree->n.uop->op);
2976 gfc_free (uop_tree->n.uop);
2977 gfc_free (uop_tree);
2981 /* Recursive function that deletes an entire tree and all the symbols
2982 that it contains. */
2985 free_sym_tree (gfc_symtree *sym_tree)
2990 if (sym_tree == NULL)
2993 free_sym_tree (sym_tree->left);
2994 free_sym_tree (sym_tree->right);
2996 sym = sym_tree->n.sym;
3000 gfc_internal_error ("free_sym_tree(): Negative refs");
3002 if (sym->formal_ns != NULL && sym->refs == 1)
3004 /* As formal_ns contains a reference to sym, delete formal_ns just
3005 before the deletion of sym. */
3006 ns = sym->formal_ns;
3007 sym->formal_ns = NULL;
3008 gfc_free_namespace (ns);
3010 else if (sym->refs == 0)
3012 /* Go ahead and delete the symbol. */
3013 gfc_free_symbol (sym);
3016 gfc_free (sym_tree);
3020 /* Free the derived type list. */
3023 gfc_free_dt_list (void)
3025 gfc_dt_list *dt, *n;
3027 for (dt = gfc_derived_types; dt; dt = n)
3033 gfc_derived_types = NULL;
3037 /* Free the gfc_equiv_info's. */
3040 gfc_free_equiv_infos (gfc_equiv_info *s)
3044 gfc_free_equiv_infos (s->next);
3049 /* Free the gfc_equiv_lists. */
3052 gfc_free_equiv_lists (gfc_equiv_list *l)
3056 gfc_free_equiv_lists (l->next);
3057 gfc_free_equiv_infos (l->equiv);
3062 /* Free a finalizer procedure list. */
3065 gfc_free_finalizer (gfc_finalizer* el)
3071 --el->proc_sym->refs;
3072 if (!el->proc_sym->refs)
3073 gfc_free_symbol (el->proc_sym);
3081 gfc_free_finalizer_list (gfc_finalizer* list)
3085 gfc_finalizer* current = list;
3087 gfc_free_finalizer (current);
3092 /* Create a new gfc_charlen structure and add it to a namespace.
3093 If 'old_cl' is given, the newly created charlen will be a copy of it. */
3096 gfc_new_charlen (gfc_namespace *ns, gfc_charlen *old_cl)
3099 cl = gfc_get_charlen ();
3101 /* Put into namespace. */
3102 cl->next = ns->cl_list;
3108 cl->length = gfc_copy_expr (old_cl->length);
3109 cl->length_from_typespec = old_cl->length_from_typespec;
3110 cl->backend_decl = old_cl->backend_decl;
3111 cl->passed_length = old_cl->passed_length;
3112 cl->resolved = old_cl->resolved;
3119 /* Free the charlen list from cl to end (end is not freed).
3120 Free the whole list if end is NULL. */
3122 void gfc_free_charlen (gfc_charlen *cl, gfc_charlen *end)
3126 for (; cl != end; cl = cl2)
3131 gfc_free_expr (cl->length);
3137 /* Free a namespace structure and everything below it. Interface
3138 lists associated with intrinsic operators are not freed. These are
3139 taken care of when a specific name is freed. */
3142 gfc_free_namespace (gfc_namespace *ns)
3144 gfc_namespace *p, *q;
3153 gcc_assert (ns->refs == 0);
3155 gfc_free_statements (ns->code);
3157 free_sym_tree (ns->sym_root);
3158 free_uop_tree (ns->uop_root);
3159 free_common_tree (ns->common_root);
3160 free_tb_tree (ns->tb_sym_root);
3161 free_tb_tree (ns->tb_uop_root);
3162 gfc_free_finalizer_list (ns->finalizers);
3163 gfc_free_charlen (ns->cl_list, NULL);
3164 free_st_labels (ns->st_labels);
3166 gfc_free_equiv (ns->equiv);
3167 gfc_free_equiv_lists (ns->equiv_lists);
3168 gfc_free_use_stmts (ns->use_stmts);
3170 for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++)
3171 gfc_free_interface (ns->op[i]);
3173 gfc_free_data (ns->data);
3177 /* Recursively free any contained namespaces. */
3182 gfc_free_namespace (q);
3188 gfc_symbol_init_2 (void)
3191 gfc_current_ns = gfc_get_namespace (NULL, 0);
3196 gfc_symbol_done_2 (void)
3199 gfc_free_namespace (gfc_current_ns);
3200 gfc_current_ns = NULL;
3201 gfc_free_dt_list ();
3205 /* Clear mark bits from symbol nodes associated with a symtree node. */
3208 clear_sym_mark (gfc_symtree *st)
3211 st->n.sym->mark = 0;
3215 /* Recursively traverse the symtree nodes. */
3218 gfc_traverse_symtree (gfc_symtree *st, void (*func) (gfc_symtree *))
3223 gfc_traverse_symtree (st->left, func);
3225 gfc_traverse_symtree (st->right, func);
3229 /* Recursive namespace traversal function. */
3232 traverse_ns (gfc_symtree *st, void (*func) (gfc_symbol *))
3238 traverse_ns (st->left, func);
3240 if (st->n.sym->mark == 0)
3241 (*func) (st->n.sym);
3242 st->n.sym->mark = 1;
3244 traverse_ns (st->right, func);
3248 /* Call a given function for all symbols in the namespace. We take
3249 care that each gfc_symbol node is called exactly once. */
3252 gfc_traverse_ns (gfc_namespace *ns, void (*func) (gfc_symbol *))
3255 gfc_traverse_symtree (ns->sym_root, clear_sym_mark);
3257 traverse_ns (ns->sym_root, func);
3261 /* Return TRUE when name is the name of an intrinsic type. */
3264 gfc_is_intrinsic_typename (const char *name)
3266 if (strcmp (name, "integer") == 0
3267 || strcmp (name, "real") == 0
3268 || strcmp (name, "character") == 0
3269 || strcmp (name, "logical") == 0
3270 || strcmp (name, "complex") == 0
3271 || strcmp (name, "doubleprecision") == 0
3272 || strcmp (name, "doublecomplex") == 0)
3279 /* Return TRUE if the symbol is an automatic variable. */
3282 gfc_is_var_automatic (gfc_symbol *sym)
3284 /* Pointer and allocatable variables are never automatic. */
3285 if (sym->attr.pointer || sym->attr.allocatable)
3287 /* Check for arrays with non-constant size. */
3288 if (sym->attr.dimension && sym->as
3289 && !gfc_is_compile_time_shape (sym->as))
3291 /* Check for non-constant length character variables. */
3292 if (sym->ts.type == BT_CHARACTER
3294 && !gfc_is_constant_expr (sym->ts.u.cl->length))
3299 /* Given a symbol, mark it as SAVEd if it is allowed. */
3302 save_symbol (gfc_symbol *sym)
3305 if (sym->attr.use_assoc)
3308 if (sym->attr.in_common
3311 || sym->attr.flavor != FL_VARIABLE)
3313 /* Automatic objects are not saved. */
3314 if (gfc_is_var_automatic (sym))
3316 gfc_add_save (&sym->attr, sym->name, &sym->declared_at);
3320 /* Mark those symbols which can be SAVEd as such. */
3323 gfc_save_all (gfc_namespace *ns)
3325 gfc_traverse_ns (ns, save_symbol);
3330 /* Make sure that no changes to symbols are pending. */
3333 gfc_symbol_state(void) {
3335 if (changed_syms != NULL)
3336 gfc_internal_error("Symbol changes still pending!");
3341 /************** Global symbol handling ************/
3344 /* Search a tree for the global symbol. */
3347 gfc_find_gsymbol (gfc_gsymbol *symbol, const char *name)
3356 c = strcmp (name, symbol->name);
3360 symbol = (c < 0) ? symbol->left : symbol->right;
3367 /* Compare two global symbols. Used for managing the BB tree. */
3370 gsym_compare (void *_s1, void *_s2)
3372 gfc_gsymbol *s1, *s2;
3374 s1 = (gfc_gsymbol *) _s1;
3375 s2 = (gfc_gsymbol *) _s2;
3376 return strcmp (s1->name, s2->name);
3380 /* Get a global symbol, creating it if it doesn't exist. */
3383 gfc_get_gsymbol (const char *name)
3387 s = gfc_find_gsymbol (gfc_gsym_root, name);
3391 s = XCNEW (gfc_gsymbol);
3392 s->type = GSYM_UNKNOWN;
3393 s->name = gfc_get_string (name);
3395 gfc_insert_bbt (&gfc_gsym_root, s, gsym_compare);
3402 get_iso_c_binding_dt (int sym_id)
3404 gfc_dt_list *dt_list;
3406 dt_list = gfc_derived_types;
3408 /* Loop through the derived types in the name list, searching for
3409 the desired symbol from iso_c_binding. Search the parent namespaces
3410 if necessary and requested to (parent_flag). */
3411 while (dt_list != NULL)
3413 if (dt_list->derived->from_intmod != INTMOD_NONE
3414 && dt_list->derived->intmod_sym_id == sym_id)
3415 return dt_list->derived;
3417 dt_list = dt_list->next;
3424 /* Verifies that the given derived type symbol, derived_sym, is interoperable
3425 with C. This is necessary for any derived type that is BIND(C) and for
3426 derived types that are parameters to functions that are BIND(C). All
3427 fields of the derived type are required to be interoperable, and are tested
3428 for such. If an error occurs, the errors are reported here, allowing for
3429 multiple errors to be handled for a single derived type. */
3432 verify_bind_c_derived_type (gfc_symbol *derived_sym)
3434 gfc_component *curr_comp = NULL;
3435 gfc_try is_c_interop = FAILURE;
3436 gfc_try retval = SUCCESS;
3438 if (derived_sym == NULL)
3439 gfc_internal_error ("verify_bind_c_derived_type(): Given symbol is "
3440 "unexpectedly NULL");
3442 /* If we've already looked at this derived symbol, do not look at it again
3443 so we don't repeat warnings/errors. */
3444 if (derived_sym->ts.is_c_interop)
3447 /* The derived type must have the BIND attribute to be interoperable
3448 J3/04-007, Section 15.2.3. */
3449 if (derived_sym->attr.is_bind_c != 1)
3451 derived_sym->ts.is_c_interop = 0;
3452 gfc_error_now ("Derived type '%s' declared at %L must have the BIND "
3453 "attribute to be C interoperable", derived_sym->name,
3454 &(derived_sym->declared_at));
3458 curr_comp = derived_sym->components;
3460 /* TODO: is this really an error? */
3461 if (curr_comp == NULL)
3463 gfc_error ("Derived type '%s' at %L is empty",
3464 derived_sym->name, &(derived_sym->declared_at));
3468 /* Initialize the derived type as being C interoperable.
3469 If we find an error in the components, this will be set false. */
3470 derived_sym->ts.is_c_interop = 1;
3472 /* Loop through the list of components to verify that the kind of
3473 each is a C interoperable type. */
3476 /* The components cannot be pointers (fortran sense).
3477 J3/04-007, Section 15.2.3, C1505. */
3478 if (curr_comp->attr.pointer != 0)
3480 gfc_error ("Component '%s' at %L cannot have the "
3481 "POINTER attribute because it is a member "
3482 "of the BIND(C) derived type '%s' at %L",
3483 curr_comp->name, &(curr_comp->loc),
3484 derived_sym->name, &(derived_sym->declared_at));
3488 if (curr_comp->attr.proc_pointer != 0)
3490 gfc_error ("Procedure pointer component '%s' at %L cannot be a member"
3491 " of the BIND(C) derived type '%s' at %L", curr_comp->name,
3492 &curr_comp->loc, derived_sym->name,
3493 &derived_sym->declared_at);
3497 /* The components cannot be allocatable.
3498 J3/04-007, Section 15.2.3, C1505. */
3499 if (curr_comp->attr.allocatable != 0)
3501 gfc_error ("Component '%s' at %L cannot have the "
3502 "ALLOCATABLE attribute because it is a member "
3503 "of the BIND(C) derived type '%s' at %L",
3504 curr_comp->name, &(curr_comp->loc),
3505 derived_sym->name, &(derived_sym->declared_at));
3509 /* BIND(C) derived types must have interoperable components. */
3510 if (curr_comp->ts.type == BT_DERIVED
3511 && curr_comp->ts.u.derived->ts.is_iso_c != 1
3512 && curr_comp->ts.u.derived != derived_sym)
3514 /* This should be allowed; the draft says a derived-type can not
3515 have type parameters if it is has the BIND attribute. Type
3516 parameters seem to be for making parameterized derived types.
3517 There's no need to verify the type if it is c_ptr/c_funptr. */
3518 retval = verify_bind_c_derived_type (curr_comp->ts.u.derived);
3522 /* Grab the typespec for the given component and test the kind. */
3523 is_c_interop = verify_c_interop (&(curr_comp->ts));
3525 if (is_c_interop != SUCCESS)
3527 /* Report warning and continue since not fatal. The
3528 draft does specify a constraint that requires all fields
3529 to interoperate, but if the user says real(4), etc., it
3530 may interoperate with *something* in C, but the compiler
3531 most likely won't know exactly what. Further, it may not
3532 interoperate with the same data type(s) in C if the user
3533 recompiles with different flags (e.g., -m32 and -m64 on
3534 x86_64 and using integer(4) to claim interop with a
3536 if (derived_sym->attr.is_bind_c == 1)
3537 /* If the derived type is bind(c), all fields must be
3539 gfc_warning ("Component '%s' in derived type '%s' at %L "
3540 "may not be C interoperable, even though "
3541 "derived type '%s' is BIND(C)",
3542 curr_comp->name, derived_sym->name,
3543 &(curr_comp->loc), derived_sym->name);
3545 /* If derived type is param to bind(c) routine, or to one
3546 of the iso_c_binding procs, it must be interoperable, so
3547 all fields must interop too. */
3548 gfc_warning ("Component '%s' in derived type '%s' at %L "
3549 "may not be C interoperable",
3550 curr_comp->name, derived_sym->name,
3555 curr_comp = curr_comp->next;
3556 } while (curr_comp != NULL);
3559 /* Make sure we don't have conflicts with the attributes. */
3560 if (derived_sym->attr.access == ACCESS_PRIVATE)
3562 gfc_error ("Derived type '%s' at %L cannot be declared with both "
3563 "PRIVATE and BIND(C) attributes", derived_sym->name,
3564 &(derived_sym->declared_at));
3568 if (derived_sym->attr.sequence != 0)
3570 gfc_error ("Derived type '%s' at %L cannot have the SEQUENCE "
3571 "attribute because it is BIND(C)", derived_sym->name,
3572 &(derived_sym->declared_at));
3576 /* Mark the derived type as not being C interoperable if we found an
3577 error. If there were only warnings, proceed with the assumption
3578 it's interoperable. */
3579 if (retval == FAILURE)
3580 derived_sym->ts.is_c_interop = 0;
3586 /* Generate symbols for the named constants c_null_ptr and c_null_funptr. */
3589 gen_special_c_interop_ptr (int ptr_id, const char *ptr_name,
3590 const char *module_name)
3592 gfc_symtree *tmp_symtree;
3593 gfc_symbol *tmp_sym;
3595 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, ptr_name);
3597 if (tmp_symtree != NULL)
3598 tmp_sym = tmp_symtree->n.sym;
3602 gfc_internal_error ("gen_special_c_interop_ptr(): Unable to "
3603 "create symbol for %s", ptr_name);
3606 /* Set up the symbol's important fields. Save attr required so we can
3607 initialize the ptr to NULL. */
3608 tmp_sym->attr.save = SAVE_EXPLICIT;
3609 tmp_sym->ts.is_c_interop = 1;
3610 tmp_sym->attr.is_c_interop = 1;
3611 tmp_sym->ts.is_iso_c = 1;
3612 tmp_sym->ts.type = BT_DERIVED;
3614 /* The c_ptr and c_funptr derived types will provide the
3615 definition for c_null_ptr and c_null_funptr, respectively. */
3616 if (ptr_id == ISOCBINDING_NULL_PTR)
3617 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_PTR);
3619 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3620 if (tmp_sym->ts.u.derived == NULL)
3622 /* This can occur if the user forgot to declare c_ptr or
3623 c_funptr and they're trying to use one of the procedures
3624 that has arg(s) of the missing type. In this case, a
3625 regular version of the thing should have been put in the
3627 generate_isocbinding_symbol (module_name, ptr_id == ISOCBINDING_NULL_PTR
3628 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR,
3629 (const char *) (ptr_id == ISOCBINDING_NULL_PTR
3630 ? "_gfortran_iso_c_binding_c_ptr"
3631 : "_gfortran_iso_c_binding_c_funptr"));
3633 tmp_sym->ts.u.derived =
3634 get_iso_c_binding_dt (ptr_id == ISOCBINDING_NULL_PTR
3635 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR);
3638 /* Module name is some mangled version of iso_c_binding. */
3639 tmp_sym->module = gfc_get_string (module_name);
3641 /* Say it's from the iso_c_binding module. */
3642 tmp_sym->attr.is_iso_c = 1;
3644 tmp_sym->attr.use_assoc = 1;
3645 tmp_sym->attr.is_bind_c = 1;
3646 /* Set the binding_label. */
3647 sprintf (tmp_sym->binding_label, "%s_%s", module_name, tmp_sym->name);
3649 /* Set the c_address field of c_null_ptr and c_null_funptr to
3650 the value of NULL. */
3651 tmp_sym->value = gfc_get_expr ();
3652 tmp_sym->value->expr_type = EXPR_STRUCTURE;
3653 tmp_sym->value->ts.type = BT_DERIVED;
3654 tmp_sym->value->ts.u.derived = tmp_sym->ts.u.derived;
3655 /* Create a constructor with no expr, that way we can recognize if the user
3656 tries to call the structure constructor for one of the iso_c_binding
3657 derived types during resolution (resolve_structure_cons). */
3658 tmp_sym->value->value.constructor = gfc_get_constructor ();
3659 /* Must declare c_null_ptr and c_null_funptr as having the
3660 PARAMETER attribute so they can be used in init expressions. */
3661 tmp_sym->attr.flavor = FL_PARAMETER;
3667 /* Add a formal argument, gfc_formal_arglist, to the
3668 end of the given list of arguments. Set the reference to the
3669 provided symbol, param_sym, in the argument. */
3672 add_formal_arg (gfc_formal_arglist **head,
3673 gfc_formal_arglist **tail,
3674 gfc_formal_arglist *formal_arg,
3675 gfc_symbol *param_sym)
3677 /* Put in list, either as first arg or at the tail (curr arg). */
3679 *head = *tail = formal_arg;
3682 (*tail)->next = formal_arg;
3683 (*tail) = formal_arg;
3686 (*tail)->sym = param_sym;
3687 (*tail)->next = NULL;
3693 /* Generates a symbol representing the CPTR argument to an
3694 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3695 CPTR and add it to the provided argument list. */
3698 gen_cptr_param (gfc_formal_arglist **head,
3699 gfc_formal_arglist **tail,
3700 const char *module_name,
3701 gfc_namespace *ns, const char *c_ptr_name,
3704 gfc_symbol *param_sym = NULL;
3705 gfc_symbol *c_ptr_sym = NULL;
3706 gfc_symtree *param_symtree = NULL;
3707 gfc_formal_arglist *formal_arg = NULL;
3708 const char *c_ptr_in;
3709 const char *c_ptr_type = NULL;
3711 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3712 c_ptr_type = "_gfortran_iso_c_binding_c_funptr";
3714 c_ptr_type = "_gfortran_iso_c_binding_c_ptr";
3716 if(c_ptr_name == NULL)
3717 c_ptr_in = "gfc_cptr__";
3719 c_ptr_in = c_ptr_name;
3720 gfc_get_sym_tree (c_ptr_in, ns, ¶m_symtree, false);
3721 if (param_symtree != NULL)
3722 param_sym = param_symtree->n.sym;
3724 gfc_internal_error ("gen_cptr_param(): Unable to "
3725 "create symbol for %s", c_ptr_in);
3727 /* Set up the appropriate fields for the new c_ptr param sym. */
3729 param_sym->attr.flavor = FL_DERIVED;
3730 param_sym->ts.type = BT_DERIVED;
3731 param_sym->attr.intent = INTENT_IN;
3732 param_sym->attr.dummy = 1;
3734 /* This will pass the ptr to the iso_c routines as a (void *). */
3735 param_sym->attr.value = 1;
3736 param_sym->attr.use_assoc = 1;
3738 /* Get the symbol for c_ptr or c_funptr, no matter what it's name is
3740 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3741 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3743 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_PTR);
3744 if (c_ptr_sym == NULL)
3746 /* This can happen if the user did not define c_ptr but they are
3747 trying to use one of the iso_c_binding functions that need it. */
3748 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3749 generate_isocbinding_symbol (module_name, ISOCBINDING_FUNPTR,
3750 (const char *)c_ptr_type);
3752 generate_isocbinding_symbol (module_name, ISOCBINDING_PTR,
3753 (const char *)c_ptr_type);
3755 gfc_get_ha_symbol (c_ptr_type, &(c_ptr_sym));
3758 param_sym->ts.u.derived = c_ptr_sym;
3759 param_sym->module = gfc_get_string (module_name);
3761 /* Make new formal arg. */
3762 formal_arg = gfc_get_formal_arglist ();
3763 /* Add arg to list of formal args (the CPTR arg). */
3764 add_formal_arg (head, tail, formal_arg, param_sym);
3768 /* Generates a symbol representing the FPTR argument to an
3769 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3770 FPTR and add it to the provided argument list. */
3773 gen_fptr_param (gfc_formal_arglist **head,
3774 gfc_formal_arglist **tail,
3775 const char *module_name,
3776 gfc_namespace *ns, const char *f_ptr_name, int proc)
3778 gfc_symbol *param_sym = NULL;
3779 gfc_symtree *param_symtree = NULL;
3780 gfc_formal_arglist *formal_arg = NULL;
3781 const char *f_ptr_out = "gfc_fptr__";
3783 if (f_ptr_name != NULL)
3784 f_ptr_out = f_ptr_name;
3786 gfc_get_sym_tree (f_ptr_out, ns, ¶m_symtree, false);
3787 if (param_symtree != NULL)
3788 param_sym = param_symtree->n.sym;
3790 gfc_internal_error ("generateFPtrParam(): Unable to "
3791 "create symbol for %s", f_ptr_out);
3793 /* Set up the necessary fields for the fptr output param sym. */
3796 param_sym->attr.proc_pointer = 1;
3798 param_sym->attr.pointer = 1;
3799 param_sym->attr.dummy = 1;
3800 param_sym->attr.use_assoc = 1;
3802 /* ISO C Binding type to allow any pointer type as actual param. */
3803 param_sym->ts.type = BT_VOID;
3804 param_sym->module = gfc_get_string (module_name);
3807 formal_arg = gfc_get_formal_arglist ();
3808 /* Add arg to list of formal args. */
3809 add_formal_arg (head, tail, formal_arg, param_sym);
3813 /* Generates a symbol representing the optional SHAPE argument for the
3814 iso_c_binding c_f_pointer() procedure. Also, create a
3815 gfc_formal_arglist for the SHAPE and add it to the provided
3819 gen_shape_param (gfc_formal_arglist **head,
3820 gfc_formal_arglist **tail,
3821 const char *module_name,
3822 gfc_namespace *ns, const char *shape_param_name)
3824 gfc_symbol *param_sym = NULL;
3825 gfc_symtree *param_symtree = NULL;
3826 gfc_formal_arglist *formal_arg = NULL;
3827 const char *shape_param = "gfc_shape_array__";
3830 if (shape_param_name != NULL)
3831 shape_param = shape_param_name;
3833 gfc_get_sym_tree (shape_param, ns, ¶m_symtree, false);
3834 if (param_symtree != NULL)
3835 param_sym = param_symtree->n.sym;
3837 gfc_internal_error ("generateShapeParam(): Unable to "
3838 "create symbol for %s", shape_param);
3840 /* Set up the necessary fields for the shape input param sym. */
3842 param_sym->attr.dummy = 1;
3843 param_sym->attr.use_assoc = 1;
3845 /* Integer array, rank 1, describing the shape of the object. Make it's
3846 type BT_VOID initially so we can accept any type/kind combination of
3847 integer. During gfc_iso_c_sub_interface (resolve.c), we'll make it
3848 of BT_INTEGER type. */
3849 param_sym->ts.type = BT_VOID;
3851 /* Initialize the kind to default integer. However, it will be overridden
3852 during resolution to match the kind of the SHAPE parameter given as
3853 the actual argument (to allow for any valid integer kind). */
3854 param_sym->ts.kind = gfc_default_integer_kind;
3855 param_sym->as = gfc_get_array_spec ();
3857 /* Clear out the dimension info for the array. */
3858 for (i = 0; i < GFC_MAX_DIMENSIONS; i++)
3860 param_sym->as->lower[i] = NULL;
3861 param_sym->as->upper[i] = NULL;
3863 param_sym->as->rank = 1;
3864 param_sym->as->lower[0] = gfc_int_expr (1);
3866 /* The extent is unknown until we get it. The length give us
3867 the rank the incoming pointer. */
3868 param_sym->as->type = AS_ASSUMED_SHAPE;
3870 /* The arg is also optional; it is required iff the second arg
3871 (fptr) is to an array, otherwise, it's ignored. */
3872 param_sym->attr.optional = 1;
3873 param_sym->attr.intent = INTENT_IN;
3874 param_sym->attr.dimension = 1;
3875 param_sym->module = gfc_get_string (module_name);
3878 formal_arg = gfc_get_formal_arglist ();
3879 /* Add arg to list of formal args. */
3880 add_formal_arg (head, tail, formal_arg, param_sym);
3884 /* Add a procedure interface to the given symbol (i.e., store a
3885 reference to the list of formal arguments). */
3888 add_proc_interface (gfc_symbol *sym, ifsrc source,
3889 gfc_formal_arglist *formal)
3892 sym->formal = formal;
3893 sym->attr.if_source = source;
3897 /* Copy the formal args from an existing symbol, src, into a new
3898 symbol, dest. New formal args are created, and the description of
3899 each arg is set according to the existing ones. This function is
3900 used when creating procedure declaration variables from a procedure
3901 declaration statement (see match_proc_decl()) to create the formal
3902 args based on the args of a given named interface. */
3905 gfc_copy_formal_args (gfc_symbol *dest, gfc_symbol *src)
3907 gfc_formal_arglist *head = NULL;
3908 gfc_formal_arglist *tail = NULL;
3909 gfc_formal_arglist *formal_arg = NULL;
3910 gfc_formal_arglist *curr_arg = NULL;
3911 gfc_formal_arglist *formal_prev = NULL;
3912 /* Save current namespace so we can change it for formal args. */
3913 gfc_namespace *parent_ns = gfc_current_ns;
3915 /* Create a new namespace, which will be the formal ns (namespace
3916 of the formal args). */
3917 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
3918 gfc_current_ns->proc_name = dest;
3920 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
3922 formal_arg = gfc_get_formal_arglist ();
3923 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
3925 /* May need to copy more info for the symbol. */
3926 formal_arg->sym->attr = curr_arg->sym->attr;
3927 formal_arg->sym->ts = curr_arg->sym->ts;
3928 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
3929 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
3931 /* If this isn't the first arg, set up the next ptr. For the
3932 last arg built, the formal_arg->next will never get set to
3933 anything other than NULL. */
3934 if (formal_prev != NULL)
3935 formal_prev->next = formal_arg;
3937 formal_arg->next = NULL;
3939 formal_prev = formal_arg;
3941 /* Add arg to list of formal args. */
3942 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
3945 /* Add the interface to the symbol. */
3946 add_proc_interface (dest, IFSRC_DECL, head);
3948 /* Store the formal namespace information. */
3949 if (dest->formal != NULL)
3950 /* The current ns should be that for the dest proc. */
3951 dest->formal_ns = gfc_current_ns;
3952 /* Restore the current namespace to what it was on entry. */
3953 gfc_current_ns = parent_ns;
3958 gfc_copy_formal_args_intr (gfc_symbol *dest, gfc_intrinsic_sym *src)
3960 gfc_formal_arglist *head = NULL;
3961 gfc_formal_arglist *tail = NULL;
3962 gfc_formal_arglist *formal_arg = NULL;
3963 gfc_intrinsic_arg *curr_arg = NULL;
3964 gfc_formal_arglist *formal_prev = NULL;
3965 /* Save current namespace so we can change it for formal args. */
3966 gfc_namespace *parent_ns = gfc_current_ns;
3968 /* Create a new namespace, which will be the formal ns (namespace
3969 of the formal args). */
3970 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
3971 gfc_current_ns->proc_name = dest;
3973 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
3975 formal_arg = gfc_get_formal_arglist ();
3976 gfc_get_symbol (curr_arg->name, gfc_current_ns, &(formal_arg->sym));
3978 /* May need to copy more info for the symbol. */
3979 formal_arg->sym->ts = curr_arg->ts;
3980 formal_arg->sym->attr.optional = curr_arg->optional;
3981 formal_arg->sym->attr.intent = curr_arg->intent;
3982 formal_arg->sym->attr.flavor = FL_VARIABLE;
3983 formal_arg->sym->attr.dummy = 1;
3985 if (formal_arg->sym->ts.type == BT_CHARACTER)
3986 formal_arg->sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
3988 /* If this isn't the first arg, set up the next ptr. For the
3989 last arg built, the formal_arg->next will never get set to
3990 anything other than NULL. */
3991 if (formal_prev != NULL)
3992 formal_prev->next = formal_arg;
3994 formal_arg->next = NULL;
3996 formal_prev = formal_arg;
3998 /* Add arg to list of formal args. */
3999 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4002 /* Add the interface to the symbol. */
4003 add_proc_interface (dest, IFSRC_DECL, head);
4005 /* Store the formal namespace information. */
4006 if (dest->formal != NULL)
4007 /* The current ns should be that for the dest proc. */
4008 dest->formal_ns = gfc_current_ns;
4009 /* Restore the current namespace to what it was on entry. */
4010 gfc_current_ns = parent_ns;
4015 gfc_copy_formal_args_ppc (gfc_component *dest, gfc_symbol *src)
4017 gfc_formal_arglist *head = NULL;
4018 gfc_formal_arglist *tail = NULL;
4019 gfc_formal_arglist *formal_arg = NULL;
4020 gfc_formal_arglist *curr_arg = NULL;
4021 gfc_formal_arglist *formal_prev = NULL;
4022 /* Save current namespace so we can change it for formal args. */
4023 gfc_namespace *parent_ns = gfc_current_ns;
4025 /* Create a new namespace, which will be the formal ns (namespace
4026 of the formal args). */
4027 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4028 /* TODO: gfc_current_ns->proc_name = dest;*/
4030 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4032 formal_arg = gfc_get_formal_arglist ();
4033 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4035 /* May need to copy more info for the symbol. */
4036 formal_arg->sym->attr = curr_arg->sym->attr;
4037 formal_arg->sym->ts = curr_arg->sym->ts;
4038 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4039 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
4041 /* If this isn't the first arg, set up the next ptr. For the
4042 last arg built, the formal_arg->next will never get set to
4043 anything other than NULL. */
4044 if (formal_prev != NULL)
4045 formal_prev->next = formal_arg;
4047 formal_arg->next = NULL;
4049 formal_prev = formal_arg;
4051 /* Add arg to list of formal args. */
4052 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4055 /* Add the interface to the symbol. */
4056 dest->formal = head;
4057 dest->attr.if_source = IFSRC_DECL;
4059 /* Store the formal namespace information. */
4060 if (dest->formal != NULL)
4061 /* The current ns should be that for the dest proc. */
4062 dest->formal_ns = gfc_current_ns;
4063 /* Restore the current namespace to what it was on entry. */
4064 gfc_current_ns = parent_ns;
4068 /* Builds the parameter list for the iso_c_binding procedure
4069 c_f_pointer or c_f_procpointer. The old_sym typically refers to a
4070 generic version of either the c_f_pointer or c_f_procpointer
4071 functions. The new_proc_sym represents a "resolved" version of the
4072 symbol. The functions are resolved to match the types of their
4073 parameters; for example, c_f_pointer(cptr, fptr) would resolve to
4074 something similar to c_f_pointer_i4 if the type of data object fptr
4075 pointed to was a default integer. The actual name of the resolved
4076 procedure symbol is further mangled with the module name, etc., but
4077 the idea holds true. */
4080 build_formal_args (gfc_symbol *new_proc_sym,
4081 gfc_symbol *old_sym, int add_optional_arg)
4083 gfc_formal_arglist *head = NULL, *tail = NULL;
4084 gfc_namespace *parent_ns = NULL;
4086 parent_ns = gfc_current_ns;
4087 /* Create a new namespace, which will be the formal ns (namespace
4088 of the formal args). */
4089 gfc_current_ns = gfc_get_namespace(parent_ns, 0);
4090 gfc_current_ns->proc_name = new_proc_sym;
4092 /* Generate the params. */
4093 if (old_sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER)
4095 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4096 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4097 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4098 gfc_current_ns, "fptr", 1);
4100 else if (old_sym->intmod_sym_id == ISOCBINDING_F_POINTER)
4102 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4103 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4104 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4105 gfc_current_ns, "fptr", 0);
4106 /* If we're dealing with c_f_pointer, it has an optional third arg. */
4107 gen_shape_param (&head, &tail,(const char *) new_proc_sym->module,
4108 gfc_current_ns, "shape");
4111 else if (old_sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
4113 /* c_associated has one required arg and one optional; both
4115 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4116 gfc_current_ns, "c_ptr_1", ISOCBINDING_ASSOCIATED);
4117 if (add_optional_arg)
4119 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4120 gfc_current_ns, "c_ptr_2", ISOCBINDING_ASSOCIATED);
4121 /* The last param is optional so mark it as such. */
4122 tail->sym->attr.optional = 1;
4126 /* Add the interface (store formal args to new_proc_sym). */
4127 add_proc_interface (new_proc_sym, IFSRC_DECL, head);
4129 /* Set up the formal_ns pointer to the one created for the
4130 new procedure so it'll get cleaned up during gfc_free_symbol(). */
4131 new_proc_sym->formal_ns = gfc_current_ns;
4133 gfc_current_ns = parent_ns;
4137 std_for_isocbinding_symbol (int id)
4141 #define NAMED_INTCST(a,b,c,d) \
4144 #include "iso-c-binding.def"
4147 return GFC_STD_F2003;
4151 /* Generate the given set of C interoperable kind objects, or all
4152 interoperable kinds. This function will only be given kind objects
4153 for valid iso_c_binding defined types because this is verified when
4154 the 'use' statement is parsed. If the user gives an 'only' clause,
4155 the specific kinds are looked up; if they don't exist, an error is
4156 reported. If the user does not give an 'only' clause, all
4157 iso_c_binding symbols are generated. If a list of specific kinds
4158 is given, it must have a NULL in the first empty spot to mark the
4163 generate_isocbinding_symbol (const char *mod_name, iso_c_binding_symbol s,
4164 const char *local_name)
4166 const char *const name = (local_name && local_name[0]) ? local_name
4167 : c_interop_kinds_table[s].name;
4168 gfc_symtree *tmp_symtree = NULL;
4169 gfc_symbol *tmp_sym = NULL;
4170 gfc_dt_list **dt_list_ptr = NULL;
4171 gfc_component *tmp_comp = NULL;
4172 char comp_name[(GFC_MAX_SYMBOL_LEN * 2) + 1];
4175 if (gfc_notification_std (std_for_isocbinding_symbol (s)) == ERROR)
4177 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, name);
4179 /* Already exists in this scope so don't re-add it.
4180 TODO: we should probably check that it's really the same symbol. */
4181 if (tmp_symtree != NULL)
4184 /* Create the sym tree in the current ns. */
4185 gfc_get_sym_tree (name, gfc_current_ns, &tmp_symtree, false);
4187 tmp_sym = tmp_symtree->n.sym;
4189 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4192 /* Say what module this symbol belongs to. */
4193 tmp_sym->module = gfc_get_string (mod_name);
4194 tmp_sym->from_intmod = INTMOD_ISO_C_BINDING;
4195 tmp_sym->intmod_sym_id = s;
4200 #define NAMED_INTCST(a,b,c,d) case a :
4201 #define NAMED_REALCST(a,b,c) case a :
4202 #define NAMED_CMPXCST(a,b,c) case a :
4203 #define NAMED_LOGCST(a,b,c) case a :
4204 #define NAMED_CHARKNDCST(a,b,c) case a :
4205 #include "iso-c-binding.def"
4207 tmp_sym->value = gfc_int_expr (c_interop_kinds_table[s].value);
4209 /* Initialize an integer constant expression node. */
4210 tmp_sym->attr.flavor = FL_PARAMETER;
4211 tmp_sym->ts.type = BT_INTEGER;
4212 tmp_sym->ts.kind = gfc_default_integer_kind;
4214 /* Mark this type as a C interoperable one. */
4215 tmp_sym->ts.is_c_interop = 1;
4216 tmp_sym->ts.is_iso_c = 1;
4217 tmp_sym->value->ts.is_c_interop = 1;
4218 tmp_sym->value->ts.is_iso_c = 1;
4219 tmp_sym->attr.is_c_interop = 1;
4221 /* Tell what f90 type this c interop kind is valid. */
4222 tmp_sym->ts.f90_type = c_interop_kinds_table[s].f90_type;
4224 /* Say it's from the iso_c_binding module. */
4225 tmp_sym->attr.is_iso_c = 1;
4227 /* Make it use associated. */
4228 tmp_sym->attr.use_assoc = 1;
4232 #define NAMED_CHARCST(a,b,c) case a :
4233 #include "iso-c-binding.def"
4235 /* Initialize an integer constant expression node for the
4236 length of the character. */
4237 tmp_sym->value = gfc_get_expr ();
4238 tmp_sym->value->expr_type = EXPR_CONSTANT;
4239 tmp_sym->value->ts.type = BT_CHARACTER;
4240 tmp_sym->value->ts.kind = gfc_default_character_kind;
4241 tmp_sym->value->where = gfc_current_locus;
4242 tmp_sym->value->ts.is_c_interop = 1;
4243 tmp_sym->value->ts.is_iso_c = 1;
4244 tmp_sym->value->value.character.length = 1;
4245 tmp_sym->value->value.character.string = gfc_get_wide_string (2);
4246 tmp_sym->value->value.character.string[0]
4247 = (gfc_char_t) c_interop_kinds_table[s].value;
4248 tmp_sym->value->value.character.string[1] = '\0';
4249 tmp_sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4250 tmp_sym->ts.u.cl->length = gfc_int_expr (1);
4252 /* May not need this in both attr and ts, but do need in
4253 attr for writing module file. */
4254 tmp_sym->attr.is_c_interop = 1;
4256 tmp_sym->attr.flavor = FL_PARAMETER;
4257 tmp_sym->ts.type = BT_CHARACTER;
4259 /* Need to set it to the C_CHAR kind. */
4260 tmp_sym->ts.kind = gfc_default_character_kind;
4262 /* Mark this type as a C interoperable one. */
4263 tmp_sym->ts.is_c_interop = 1;
4264 tmp_sym->ts.is_iso_c = 1;
4266 /* Tell what f90 type this c interop kind is valid. */
4267 tmp_sym->ts.f90_type = BT_CHARACTER;
4269 /* Say it's from the iso_c_binding module. */
4270 tmp_sym->attr.is_iso_c = 1;
4272 /* Make it use associated. */
4273 tmp_sym->attr.use_assoc = 1;
4276 case ISOCBINDING_PTR:
4277 case ISOCBINDING_FUNPTR:
4279 /* Initialize an integer constant expression node. */
4280 tmp_sym->attr.flavor = FL_DERIVED;
4281 tmp_sym->ts.is_c_interop = 1;
4282 tmp_sym->attr.is_c_interop = 1;
4283 tmp_sym->attr.is_iso_c = 1;
4284 tmp_sym->ts.is_iso_c = 1;
4285 tmp_sym->ts.type = BT_DERIVED;
4287 /* A derived type must have the bind attribute to be
4288 interoperable (J3/04-007, Section 15.2.3), even though
4289 the binding label is not used. */
4290 tmp_sym->attr.is_bind_c = 1;
4292 tmp_sym->attr.referenced = 1;
4294 tmp_sym->ts.u.derived = tmp_sym;
4296 /* Add the symbol created for the derived type to the current ns. */
4297 dt_list_ptr = &(gfc_derived_types);
4298 while (*dt_list_ptr != NULL && (*dt_list_ptr)->next != NULL)
4299 dt_list_ptr = &((*dt_list_ptr)->next);
4301 /* There is already at least one derived type in the list, so append
4302 the one we're currently building for c_ptr or c_funptr. */
4303 if (*dt_list_ptr != NULL)
4304 dt_list_ptr = &((*dt_list_ptr)->next);
4305 (*dt_list_ptr) = gfc_get_dt_list ();
4306 (*dt_list_ptr)->derived = tmp_sym;
4307 (*dt_list_ptr)->next = NULL;
4309 /* Set up the component of the derived type, which will be
4310 an integer with kind equal to c_ptr_size. Mangle the name of
4311 the field for the c_address to prevent the curious user from
4312 trying to access it from Fortran. */
4313 sprintf (comp_name, "__%s_%s", tmp_sym->name, "c_address");
4314 gfc_add_component (tmp_sym, comp_name, &tmp_comp);
4315 if (tmp_comp == NULL)
4316 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4317 "create component for c_address");
4319 tmp_comp->ts.type = BT_INTEGER;
4321 /* Set this because the module will need to read/write this field. */
4322 tmp_comp->ts.f90_type = BT_INTEGER;
4324 /* The kinds for c_ptr and c_funptr are the same. */
4325 index = get_c_kind ("c_ptr", c_interop_kinds_table);
4326 tmp_comp->ts.kind = c_interop_kinds_table[index].value;
4328 tmp_comp->attr.pointer = 0;
4329 tmp_comp->attr.dimension = 0;
4331 /* Mark the component as C interoperable. */
4332 tmp_comp->ts.is_c_interop = 1;
4334 /* Make it use associated (iso_c_binding module). */
4335 tmp_sym->attr.use_assoc = 1;
4338 case ISOCBINDING_NULL_PTR:
4339 case ISOCBINDING_NULL_FUNPTR:
4340 gen_special_c_interop_ptr (s, name, mod_name);
4343 case ISOCBINDING_F_POINTER:
4344 case ISOCBINDING_ASSOCIATED:
4345 case ISOCBINDING_LOC:
4346 case ISOCBINDING_FUNLOC:
4347 case ISOCBINDING_F_PROCPOINTER:
4349 tmp_sym->attr.proc = PROC_MODULE;
4351 /* Use the procedure's name as it is in the iso_c_binding module for
4352 setting the binding label in case the user renamed the symbol. */
4353 sprintf (tmp_sym->binding_label, "%s_%s", mod_name,
4354 c_interop_kinds_table[s].name);
4355 tmp_sym->attr.is_iso_c = 1;
4356 if (s == ISOCBINDING_F_POINTER || s == ISOCBINDING_F_PROCPOINTER)
4357 tmp_sym->attr.subroutine = 1;
4360 /* TODO! This needs to be finished more for the expr of the
4361 function or something!
4362 This may not need to be here, because trying to do c_loc
4364 if (s == ISOCBINDING_ASSOCIATED)
4366 tmp_sym->attr.function = 1;
4367 tmp_sym->ts.type = BT_LOGICAL;
4368 tmp_sym->ts.kind = gfc_default_logical_kind;
4369 tmp_sym->result = tmp_sym;
4373 /* Here, we're taking the simple approach. We're defining
4374 c_loc as an external identifier so the compiler will put
4375 what we expect on the stack for the address we want the
4377 tmp_sym->ts.type = BT_DERIVED;
4378 if (s == ISOCBINDING_LOC)
4379 tmp_sym->ts.u.derived =
4380 get_iso_c_binding_dt (ISOCBINDING_PTR);
4382 tmp_sym->ts.u.derived =
4383 get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
4385 if (tmp_sym->ts.u.derived == NULL)
4387 /* Create the necessary derived type so we can continue
4388 processing the file. */
4389 generate_isocbinding_symbol
4390 (mod_name, s == ISOCBINDING_FUNLOC
4391 ? ISOCBINDING_FUNPTR : ISOCBINDING_PTR,
4392 (const char *)(s == ISOCBINDING_FUNLOC
4393 ? "_gfortran_iso_c_binding_c_funptr"
4394 : "_gfortran_iso_c_binding_c_ptr"));
4395 tmp_sym->ts.u.derived =
4396 get_iso_c_binding_dt (s == ISOCBINDING_FUNLOC
4397 ? ISOCBINDING_FUNPTR
4401 /* The function result is itself (no result clause). */
4402 tmp_sym->result = tmp_sym;
4403 tmp_sym->attr.external = 1;
4404 tmp_sym->attr.use_assoc = 0;
4405 tmp_sym->attr.pure = 1;
4406 tmp_sym->attr.if_source = IFSRC_UNKNOWN;
4407 tmp_sym->attr.proc = PROC_UNKNOWN;
4411 tmp_sym->attr.flavor = FL_PROCEDURE;
4412 tmp_sym->attr.contained = 0;
4414 /* Try using this builder routine, with the new and old symbols
4415 both being the generic iso_c proc sym being created. This
4416 will create the formal args (and the new namespace for them).
4417 Don't build an arg list for c_loc because we're going to treat
4418 c_loc as an external procedure. */
4419 if (s != ISOCBINDING_LOC && s != ISOCBINDING_FUNLOC)
4420 /* The 1 says to add any optional args, if applicable. */
4421 build_formal_args (tmp_sym, tmp_sym, 1);
4423 /* Set this after setting up the symbol, to prevent error messages. */
4424 tmp_sym->attr.use_assoc = 1;
4426 /* This symbol will not be referenced directly. It will be
4427 resolved to the implementation for the given f90 kind. */
4428 tmp_sym->attr.referenced = 0;
4438 /* Creates a new symbol based off of an old iso_c symbol, with a new
4439 binding label. This function can be used to create a new,
4440 resolved, version of a procedure symbol for c_f_pointer or
4441 c_f_procpointer that is based on the generic symbols. A new
4442 parameter list is created for the new symbol using
4443 build_formal_args(). The add_optional_flag specifies whether the
4444 to add the optional SHAPE argument. The new symbol is
4448 get_iso_c_sym (gfc_symbol *old_sym, char *new_name,
4449 char *new_binding_label, int add_optional_arg)
4451 gfc_symtree *new_symtree = NULL;
4453 /* See if we have a symbol by that name already available, looking
4454 through any parent namespaces. */
4455 gfc_find_sym_tree (new_name, gfc_current_ns, 1, &new_symtree);
4456 if (new_symtree != NULL)
4457 /* Return the existing symbol. */
4458 return new_symtree->n.sym;
4460 /* Create the symtree/symbol, with attempted host association. */
4461 gfc_get_ha_sym_tree (new_name, &new_symtree);
4462 if (new_symtree == NULL)
4463 gfc_internal_error ("get_iso_c_sym(): Unable to create "
4464 "symtree for '%s'", new_name);
4466 /* Now fill in the fields of the resolved symbol with the old sym. */
4467 strcpy (new_symtree->n.sym->binding_label, new_binding_label);
4468 new_symtree->n.sym->attr = old_sym->attr;
4469 new_symtree->n.sym->ts = old_sym->ts;
4470 new_symtree->n.sym->module = gfc_get_string (old_sym->module);
4471 new_symtree->n.sym->from_intmod = old_sym->from_intmod;
4472 new_symtree->n.sym->intmod_sym_id = old_sym->intmod_sym_id;
4473 /* Build the formal arg list. */
4474 build_formal_args (new_symtree->n.sym, old_sym, add_optional_arg);
4476 gfc_commit_symbol (new_symtree->n.sym);
4478 return new_symtree->n.sym;
4482 /* Check that a symbol is already typed. If strict is not set, an untyped
4483 symbol is acceptable for non-standard-conforming mode. */
4486 gfc_check_symbol_typed (gfc_symbol* sym, gfc_namespace* ns,
4487 bool strict, locus where)
4491 if (gfc_matching_prefix)
4494 /* Check for the type and try to give it an implicit one. */
4495 if (sym->ts.type == BT_UNKNOWN
4496 && gfc_set_default_type (sym, 0, ns) == FAILURE)
4500 gfc_error ("Symbol '%s' is used before it is typed at %L",
4505 if (gfc_notify_std (GFC_STD_GNU,
4506 "Extension: Symbol '%s' is used before"
4507 " it is typed at %L", sym->name, &where) == FAILURE)
4511 /* Everything is ok. */
4516 /* Construct a typebound-procedure structure. Those are stored in a tentative
4517 list and marked `error' until symbols are committed. */
4520 gfc_get_typebound_proc (void)
4522 gfc_typebound_proc *result;
4523 tentative_tbp *list_node;
4525 result = XCNEW (gfc_typebound_proc);
4528 list_node = XCNEW (tentative_tbp);
4529 list_node->next = tentative_tbp_list;
4530 list_node->proc = result;
4531 tentative_tbp_list = list_node;
4537 /* Get the super-type of a given derived type. */
4540 gfc_get_derived_super_type (gfc_symbol* derived)
4542 if (!derived->attr.extension)
4545 gcc_assert (derived->components);
4546 gcc_assert (derived->components->ts.type == BT_DERIVED);
4547 gcc_assert (derived->components->ts.u.derived);
4549 return derived->components->ts.u.derived;
4553 /* Get the ultimate super-type of a given derived type. */
4556 gfc_get_ultimate_derived_super_type (gfc_symbol* derived)
4558 if (!derived->attr.extension)
4561 derived = gfc_get_derived_super_type (derived);
4563 if (derived->attr.extension)
4564 return gfc_get_ultimate_derived_super_type (derived);
4570 /* Check if a derived type t2 is an extension of (or equal to) a type t1. */
4573 gfc_type_is_extension_of (gfc_symbol *t1, gfc_symbol *t2)
4575 while (!gfc_compare_derived_types (t1, t2) && t2->attr.extension)
4576 t2 = gfc_get_derived_super_type (t2);
4577 return gfc_compare_derived_types (t1, t2);
4581 /* Check if two typespecs are type compatible (F03:5.1.1.2):
4582 If ts1 is nonpolymorphic, ts2 must be the same type.
4583 If ts1 is polymorphic (CLASS), ts2 must be an extension of ts1. */
4586 gfc_type_compatible (gfc_typespec *ts1, gfc_typespec *ts2)
4588 if ((ts1->type == BT_DERIVED || ts1->type == BT_CLASS)
4589 && (ts2->type == BT_DERIVED || ts2->type == BT_CLASS))
4591 if (ts1->type == BT_CLASS && ts2->type == BT_DERIVED)
4592 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4594 else if (ts1->type == BT_CLASS && ts2->type == BT_CLASS)
4595 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4596 ts2->u.derived->components->ts.u.derived);
4597 else if (ts2->type != BT_CLASS)
4598 return gfc_compare_derived_types (ts1->u.derived, ts2->u.derived);
4603 return (ts1->type == ts2->type);
4607 /* General worker function to find either a type-bound procedure or a
4608 type-bound user operator. */
4611 find_typebound_proc_uop (gfc_symbol* derived, gfc_try* t,
4612 const char* name, bool noaccess, bool uop,
4618 /* Set correct symbol-root. */
4619 gcc_assert (derived->f2k_derived);
4620 root = (uop ? derived->f2k_derived->tb_uop_root
4621 : derived->f2k_derived->tb_sym_root);
4623 /* Set default to failure. */
4627 /* Try to find it in the current type's namespace. */
4628 res = gfc_find_symtree (root, name);
4629 if (res && res->n.tb && !res->n.tb->error)
4635 if (!noaccess && derived->attr.use_assoc
4636 && res->n.tb->access == ACCESS_PRIVATE)
4639 gfc_error ("'%s' of '%s' is PRIVATE at %L",
4640 name, derived->name, where);
4648 /* Otherwise, recurse on parent type if derived is an extension. */
4649 if (derived->attr.extension)
4651 gfc_symbol* super_type;
4652 super_type = gfc_get_derived_super_type (derived);
4653 gcc_assert (super_type);
4655 return find_typebound_proc_uop (super_type, t, name,
4656 noaccess, uop, where);
4659 /* Nothing found. */
4664 /* Find a type-bound procedure or user operator by name for a derived-type
4665 (looking recursively through the super-types). */
4668 gfc_find_typebound_proc (gfc_symbol* derived, gfc_try* t,
4669 const char* name, bool noaccess, locus* where)
4671 return find_typebound_proc_uop (derived, t, name, noaccess, false, where);
4675 gfc_find_typebound_user_op (gfc_symbol* derived, gfc_try* t,
4676 const char* name, bool noaccess, locus* where)
4678 return find_typebound_proc_uop (derived, t, name, noaccess, true, where);
4682 /* Find a type-bound intrinsic operator looking recursively through the
4683 super-type hierarchy. */
4686 gfc_find_typebound_intrinsic_op (gfc_symbol* derived, gfc_try* t,
4687 gfc_intrinsic_op op, bool noaccess,
4690 gfc_typebound_proc* res;
4692 /* Set default to failure. */
4696 /* Try to find it in the current type's namespace. */
4697 if (derived->f2k_derived)
4698 res = derived->f2k_derived->tb_op[op];
4703 if (res && !res->error)
4709 if (!noaccess && derived->attr.use_assoc
4710 && res->access == ACCESS_PRIVATE)
4713 gfc_error ("'%s' of '%s' is PRIVATE at %L",
4714 gfc_op2string (op), derived->name, where);
4722 /* Otherwise, recurse on parent type if derived is an extension. */
4723 if (derived->attr.extension)
4725 gfc_symbol* super_type;
4726 super_type = gfc_get_derived_super_type (derived);
4727 gcc_assert (super_type);
4729 return gfc_find_typebound_intrinsic_op (super_type, t, op,
4733 /* Nothing found. */
4738 /* Get a typebound-procedure symtree or create and insert it if not yet
4739 present. This is like a very simplified version of gfc_get_sym_tree for
4740 tbp-symtrees rather than regular ones. */
4743 gfc_get_tbp_symtree (gfc_symtree **root, const char *name)
4745 gfc_symtree *result;
4747 result = gfc_find_symtree (*root, name);
4750 result = gfc_new_symtree (root, name);
4751 gcc_assert (result);
4752 result->n.tb = NULL;