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 *asynchronous = "ASYNCHRONOUS";
374 static const char *threadprivate = "THREADPRIVATE";
380 where = &gfc_current_locus;
382 if (attr->pointer && attr->intent != INTENT_UNKNOWN)
386 standard = GFC_STD_F2003;
390 /* Check for attributes not allowed in a BLOCK DATA. */
391 if (gfc_current_state () == COMP_BLOCK_DATA)
395 if (attr->in_namelist)
397 if (attr->allocatable)
403 if (attr->access == ACCESS_PRIVATE)
405 if (attr->access == ACCESS_PUBLIC)
407 if (attr->intent != INTENT_UNKNOWN)
413 ("%s attribute not allowed in BLOCK DATA program unit at %L",
419 if (attr->save == SAVE_EXPLICIT)
422 conf (in_common, save);
425 switch (attr->flavor)
433 a1 = gfc_code2string (flavors, attr->flavor);
438 /* Conflicts between SAVE and PROCEDURE will be checked at
439 resolution stage, see "resolve_fl_procedure". */
448 conf (dummy, intrinsic);
449 conf (dummy, threadprivate);
450 conf (pointer, target);
451 conf (pointer, intrinsic);
452 conf (pointer, elemental);
453 conf (allocatable, elemental);
455 conf (target, external);
456 conf (target, intrinsic);
458 if (!attr->if_source)
459 conf (external, dimension); /* See Fortran 95's R504. */
461 conf (external, intrinsic);
462 conf (entry, intrinsic);
464 if ((attr->if_source == IFSRC_DECL && !attr->procedure) || attr->contained)
465 conf (external, subroutine);
467 if (attr->proc_pointer && gfc_notify_std (GFC_STD_F2003,
468 "Fortran 2003: Procedure pointer at %C") == FAILURE)
471 conf (allocatable, pointer);
472 conf_std (allocatable, dummy, GFC_STD_F2003);
473 conf_std (allocatable, function, GFC_STD_F2003);
474 conf_std (allocatable, result, GFC_STD_F2003);
475 conf (elemental, recursive);
477 conf (in_common, dummy);
478 conf (in_common, allocatable);
479 conf (in_common, result);
481 conf (dummy, result);
483 conf (in_equivalence, use_assoc);
484 conf (in_equivalence, dummy);
485 conf (in_equivalence, target);
486 conf (in_equivalence, pointer);
487 conf (in_equivalence, function);
488 conf (in_equivalence, result);
489 conf (in_equivalence, entry);
490 conf (in_equivalence, allocatable);
491 conf (in_equivalence, threadprivate);
493 conf (in_namelist, pointer);
494 conf (in_namelist, allocatable);
496 conf (entry, result);
498 conf (function, subroutine);
500 if (!function && !subroutine)
501 conf (is_bind_c, dummy);
503 conf (is_bind_c, cray_pointer);
504 conf (is_bind_c, cray_pointee);
505 conf (is_bind_c, allocatable);
506 conf (is_bind_c, elemental);
508 /* Need to also get volatile attr, according to 5.1 of F2003 draft.
509 Parameter conflict caught below. Also, value cannot be specified
510 for a dummy procedure. */
512 /* Cray pointer/pointee conflicts. */
513 conf (cray_pointer, cray_pointee);
514 conf (cray_pointer, dimension);
515 conf (cray_pointer, pointer);
516 conf (cray_pointer, target);
517 conf (cray_pointer, allocatable);
518 conf (cray_pointer, external);
519 conf (cray_pointer, intrinsic);
520 conf (cray_pointer, in_namelist);
521 conf (cray_pointer, function);
522 conf (cray_pointer, subroutine);
523 conf (cray_pointer, entry);
525 conf (cray_pointee, allocatable);
526 conf (cray_pointee, intent);
527 conf (cray_pointee, optional);
528 conf (cray_pointee, dummy);
529 conf (cray_pointee, target);
530 conf (cray_pointee, intrinsic);
531 conf (cray_pointee, pointer);
532 conf (cray_pointee, entry);
533 conf (cray_pointee, in_common);
534 conf (cray_pointee, in_equivalence);
535 conf (cray_pointee, threadprivate);
538 conf (data, function);
540 conf (data, allocatable);
541 conf (data, use_assoc);
543 conf (value, pointer)
544 conf (value, allocatable)
545 conf (value, subroutine)
546 conf (value, function)
547 conf (value, volatile_)
548 conf (value, dimension)
549 conf (value, external)
552 && (attr->intent == INTENT_OUT || attr->intent == INTENT_INOUT))
555 a2 = attr->intent == INTENT_OUT ? intent_out : intent_inout;
559 conf (is_protected, intrinsic)
560 conf (is_protected, external)
561 conf (is_protected, in_common)
563 conf (asynchronous, intrinsic)
564 conf (asynchronous, external)
566 conf (volatile_, intrinsic)
567 conf (volatile_, external)
569 if (attr->volatile_ && attr->intent == INTENT_IN)
576 conf (procedure, allocatable)
577 conf (procedure, dimension)
578 conf (procedure, intrinsic)
579 conf (procedure, is_protected)
580 conf (procedure, target)
581 conf (procedure, value)
582 conf (procedure, volatile_)
583 conf (procedure, asynchronous)
584 conf (procedure, entry)
586 a1 = gfc_code2string (flavors, attr->flavor);
588 if (attr->in_namelist
589 && attr->flavor != FL_VARIABLE
590 && attr->flavor != FL_PROCEDURE
591 && attr->flavor != FL_UNKNOWN)
597 switch (attr->flavor)
606 conf2 (asynchronous);
608 conf2 (is_protected);
618 conf2 (threadprivate);
620 if (attr->access == ACCESS_PUBLIC || attr->access == ACCESS_PRIVATE)
622 a2 = attr->access == ACCESS_PUBLIC ? publik : privat;
623 gfc_error ("%s attribute applied to %s %s at %L", a2, a1,
630 gfc_error_now ("BIND(C) applied to %s %s at %L", a1, name, where);
644 /* Conflicts with INTENT, SAVE and RESULT will be checked
645 at resolution stage, see "resolve_fl_procedure". */
647 if (attr->subroutine)
653 conf2 (asynchronous);
657 conf2 (threadprivate);
660 if (!attr->proc_pointer)
665 case PROC_ST_FUNCTION:
675 conf2 (threadprivate);
695 conf2 (threadprivate);
698 if (attr->intent != INTENT_UNKNOWN)
714 conf2 (is_protected);
720 conf2 (asynchronous);
721 conf2 (threadprivate);
735 gfc_error ("%s attribute conflicts with %s attribute at %L",
738 gfc_error ("%s attribute conflicts with %s attribute in '%s' at %L",
739 a1, a2, name, where);
746 return gfc_notify_std (standard, "Fortran 2003: %s attribute "
747 "with %s attribute at %L", a1, a2,
752 return gfc_notify_std (standard, "Fortran 2003: %s attribute "
753 "with %s attribute in '%s' at %L",
754 a1, a2, name, where);
763 /* Mark a symbol as referenced. */
766 gfc_set_sym_referenced (gfc_symbol *sym)
769 if (sym->attr.referenced)
772 sym->attr.referenced = 1;
774 /* Remember which order dummy variables are accessed in. */
776 sym->dummy_order = next_dummy_order++;
780 /* Common subroutine called by attribute changing subroutines in order
781 to prevent them from changing a symbol that has been
782 use-associated. Returns zero if it is OK to change the symbol,
786 check_used (symbol_attribute *attr, const char *name, locus *where)
789 if (attr->use_assoc == 0)
793 where = &gfc_current_locus;
796 gfc_error ("Cannot change attributes of USE-associated symbol at %L",
799 gfc_error ("Cannot change attributes of USE-associated symbol %s at %L",
806 /* Generate an error because of a duplicate attribute. */
809 duplicate_attr (const char *attr, locus *where)
813 where = &gfc_current_locus;
815 gfc_error ("Duplicate %s attribute specified at %L", attr, where);
820 gfc_add_ext_attribute (symbol_attribute *attr, ext_attr_id_t ext_attr,
821 locus *where ATTRIBUTE_UNUSED)
823 attr->ext_attr |= 1 << ext_attr;
828 /* Called from decl.c (attr_decl1) to check attributes, when declared
832 gfc_add_attribute (symbol_attribute *attr, locus *where)
834 if (check_used (attr, NULL, where))
837 return check_conflict (attr, NULL, where);
842 gfc_add_allocatable (symbol_attribute *attr, locus *where)
845 if (check_used (attr, NULL, where))
848 if (attr->allocatable)
850 duplicate_attr ("ALLOCATABLE", where);
854 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
855 && gfc_find_state (COMP_INTERFACE) == FAILURE)
857 gfc_error ("ALLOCATABLE specified outside of INTERFACE body at %L",
862 attr->allocatable = 1;
863 return check_conflict (attr, NULL, where);
868 gfc_add_dimension (symbol_attribute *attr, const char *name, locus *where)
871 if (check_used (attr, name, where))
876 duplicate_attr ("DIMENSION", where);
880 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
881 && gfc_find_state (COMP_INTERFACE) == FAILURE)
883 gfc_error ("DIMENSION specified for '%s' outside its INTERFACE body "
884 "at %L", name, where);
889 return check_conflict (attr, name, where);
894 gfc_add_external (symbol_attribute *attr, locus *where)
897 if (check_used (attr, NULL, where))
902 duplicate_attr ("EXTERNAL", where);
906 if (attr->pointer && attr->if_source != IFSRC_IFBODY)
909 attr->proc_pointer = 1;
914 return check_conflict (attr, NULL, where);
919 gfc_add_intrinsic (symbol_attribute *attr, locus *where)
922 if (check_used (attr, NULL, where))
927 duplicate_attr ("INTRINSIC", where);
933 return check_conflict (attr, NULL, where);
938 gfc_add_optional (symbol_attribute *attr, locus *where)
941 if (check_used (attr, NULL, where))
946 duplicate_attr ("OPTIONAL", where);
951 return check_conflict (attr, NULL, where);
956 gfc_add_pointer (symbol_attribute *attr, locus *where)
959 if (check_used (attr, NULL, where))
962 if (attr->pointer && !(attr->if_source == IFSRC_IFBODY
963 && gfc_find_state (COMP_INTERFACE) == FAILURE))
965 duplicate_attr ("POINTER", where);
969 if (attr->procedure || (attr->external && attr->if_source != IFSRC_IFBODY)
970 || (attr->if_source == IFSRC_IFBODY
971 && gfc_find_state (COMP_INTERFACE) == FAILURE))
972 attr->proc_pointer = 1;
976 return check_conflict (attr, NULL, where);
981 gfc_add_cray_pointer (symbol_attribute *attr, locus *where)
984 if (check_used (attr, NULL, where))
987 attr->cray_pointer = 1;
988 return check_conflict (attr, NULL, where);
993 gfc_add_cray_pointee (symbol_attribute *attr, locus *where)
996 if (check_used (attr, NULL, where))
999 if (attr->cray_pointee)
1001 gfc_error ("Cray Pointee at %L appears in multiple pointer()"
1002 " statements", where);
1006 attr->cray_pointee = 1;
1007 return check_conflict (attr, NULL, where);
1012 gfc_add_protected (symbol_attribute *attr, const char *name, locus *where)
1014 if (check_used (attr, name, where))
1017 if (attr->is_protected)
1019 if (gfc_notify_std (GFC_STD_LEGACY,
1020 "Duplicate PROTECTED attribute specified at %L",
1026 attr->is_protected = 1;
1027 return check_conflict (attr, name, where);
1032 gfc_add_result (symbol_attribute *attr, const char *name, locus *where)
1035 if (check_used (attr, name, where))
1039 return check_conflict (attr, name, where);
1044 gfc_add_save (symbol_attribute *attr, const char *name, locus *where)
1047 if (check_used (attr, name, where))
1050 if (gfc_pure (NULL))
1053 ("SAVE attribute at %L cannot be specified in a PURE procedure",
1058 if (attr->save == SAVE_EXPLICIT && !attr->vtab)
1060 if (gfc_notify_std (GFC_STD_LEGACY,
1061 "Duplicate SAVE attribute specified at %L",
1067 attr->save = SAVE_EXPLICIT;
1068 return check_conflict (attr, name, where);
1073 gfc_add_value (symbol_attribute *attr, const char *name, locus *where)
1076 if (check_used (attr, name, where))
1081 if (gfc_notify_std (GFC_STD_LEGACY,
1082 "Duplicate VALUE attribute specified at %L",
1089 return check_conflict (attr, name, where);
1094 gfc_add_volatile (symbol_attribute *attr, const char *name, locus *where)
1096 /* No check_used needed as 11.2.1 of the F2003 standard allows
1097 that the local identifier made accessible by a use statement can be
1098 given a VOLATILE attribute. */
1100 if (attr->volatile_ && attr->volatile_ns == gfc_current_ns)
1101 if (gfc_notify_std (GFC_STD_LEGACY,
1102 "Duplicate VOLATILE attribute specified at %L", where)
1106 attr->volatile_ = 1;
1107 attr->volatile_ns = gfc_current_ns;
1108 return check_conflict (attr, name, where);
1113 gfc_add_asynchronous (symbol_attribute *attr, const char *name, locus *where)
1115 /* No check_used needed as 11.2.1 of the F2003 standard allows
1116 that the local identifier made accessible by a use statement can be
1117 given a ASYNCHRONOUS attribute. */
1119 if (attr->asynchronous && attr->asynchronous_ns == gfc_current_ns)
1120 if (gfc_notify_std (GFC_STD_LEGACY,
1121 "Duplicate ASYNCHRONOUS attribute specified at %L",
1125 attr->asynchronous = 1;
1126 attr->asynchronous_ns = gfc_current_ns;
1127 return check_conflict (attr, name, where);
1132 gfc_add_threadprivate (symbol_attribute *attr, const char *name, locus *where)
1135 if (check_used (attr, name, where))
1138 if (attr->threadprivate)
1140 duplicate_attr ("THREADPRIVATE", where);
1144 attr->threadprivate = 1;
1145 return check_conflict (attr, name, where);
1150 gfc_add_target (symbol_attribute *attr, locus *where)
1153 if (check_used (attr, NULL, where))
1158 duplicate_attr ("TARGET", where);
1163 return check_conflict (attr, NULL, where);
1168 gfc_add_dummy (symbol_attribute *attr, const char *name, locus *where)
1171 if (check_used (attr, name, where))
1174 /* Duplicate dummy arguments are allowed due to ENTRY statements. */
1176 return check_conflict (attr, name, where);
1181 gfc_add_in_common (symbol_attribute *attr, const char *name, locus *where)
1184 if (check_used (attr, name, where))
1187 /* Duplicate attribute already checked for. */
1188 attr->in_common = 1;
1189 return check_conflict (attr, name, where);
1194 gfc_add_in_equivalence (symbol_attribute *attr, const char *name, locus *where)
1197 /* Duplicate attribute already checked for. */
1198 attr->in_equivalence = 1;
1199 if (check_conflict (attr, name, where) == FAILURE)
1202 if (attr->flavor == FL_VARIABLE)
1205 return gfc_add_flavor (attr, FL_VARIABLE, name, where);
1210 gfc_add_data (symbol_attribute *attr, const char *name, locus *where)
1213 if (check_used (attr, name, where))
1217 return check_conflict (attr, name, where);
1222 gfc_add_in_namelist (symbol_attribute *attr, const char *name, locus *where)
1225 attr->in_namelist = 1;
1226 return check_conflict (attr, name, where);
1231 gfc_add_sequence (symbol_attribute *attr, const char *name, locus *where)
1234 if (check_used (attr, name, where))
1238 return check_conflict (attr, name, where);
1243 gfc_add_elemental (symbol_attribute *attr, locus *where)
1246 if (check_used (attr, NULL, where))
1249 if (attr->elemental)
1251 duplicate_attr ("ELEMENTAL", where);
1255 attr->elemental = 1;
1256 return check_conflict (attr, NULL, where);
1261 gfc_add_pure (symbol_attribute *attr, locus *where)
1264 if (check_used (attr, NULL, where))
1269 duplicate_attr ("PURE", where);
1274 return check_conflict (attr, NULL, where);
1279 gfc_add_recursive (symbol_attribute *attr, locus *where)
1282 if (check_used (attr, NULL, where))
1285 if (attr->recursive)
1287 duplicate_attr ("RECURSIVE", where);
1291 attr->recursive = 1;
1292 return check_conflict (attr, NULL, where);
1297 gfc_add_entry (symbol_attribute *attr, const char *name, locus *where)
1300 if (check_used (attr, name, where))
1305 duplicate_attr ("ENTRY", where);
1310 return check_conflict (attr, name, where);
1315 gfc_add_function (symbol_attribute *attr, const char *name, locus *where)
1318 if (attr->flavor != FL_PROCEDURE
1319 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1323 return check_conflict (attr, name, where);
1328 gfc_add_subroutine (symbol_attribute *attr, const char *name, locus *where)
1331 if (attr->flavor != FL_PROCEDURE
1332 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1335 attr->subroutine = 1;
1336 return check_conflict (attr, name, where);
1341 gfc_add_generic (symbol_attribute *attr, const char *name, locus *where)
1344 if (attr->flavor != FL_PROCEDURE
1345 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1349 return check_conflict (attr, name, where);
1354 gfc_add_proc (symbol_attribute *attr, const char *name, locus *where)
1357 if (check_used (attr, NULL, where))
1360 if (attr->flavor != FL_PROCEDURE
1361 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1364 if (attr->procedure)
1366 duplicate_attr ("PROCEDURE", where);
1370 attr->procedure = 1;
1372 return check_conflict (attr, NULL, where);
1377 gfc_add_abstract (symbol_attribute* attr, locus* where)
1381 duplicate_attr ("ABSTRACT", where);
1390 /* Flavors are special because some flavors are not what Fortran
1391 considers attributes and can be reaffirmed multiple times. */
1394 gfc_add_flavor (symbol_attribute *attr, sym_flavor f, const char *name,
1398 if ((f == FL_PROGRAM || f == FL_BLOCK_DATA || f == FL_MODULE
1399 || f == FL_PARAMETER || f == FL_LABEL || f == FL_DERIVED
1400 || f == FL_NAMELIST) && check_used (attr, name, where))
1403 if (attr->flavor == f && f == FL_VARIABLE)
1406 if (attr->flavor != FL_UNKNOWN)
1409 where = &gfc_current_locus;
1412 gfc_error ("%s attribute of '%s' conflicts with %s attribute at %L",
1413 gfc_code2string (flavors, attr->flavor), name,
1414 gfc_code2string (flavors, f), where);
1416 gfc_error ("%s attribute conflicts with %s attribute at %L",
1417 gfc_code2string (flavors, attr->flavor),
1418 gfc_code2string (flavors, f), where);
1425 return check_conflict (attr, name, where);
1430 gfc_add_procedure (symbol_attribute *attr, procedure_type t,
1431 const char *name, locus *where)
1434 if (check_used (attr, name, where))
1437 if (attr->flavor != FL_PROCEDURE
1438 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1442 where = &gfc_current_locus;
1444 if (attr->proc != PROC_UNKNOWN)
1446 gfc_error ("%s procedure at %L is already declared as %s procedure",
1447 gfc_code2string (procedures, t), where,
1448 gfc_code2string (procedures, attr->proc));
1455 /* Statement functions are always scalar and functions. */
1456 if (t == PROC_ST_FUNCTION
1457 && ((!attr->function && gfc_add_function (attr, name, where) == FAILURE)
1458 || attr->dimension))
1461 return check_conflict (attr, name, where);
1466 gfc_add_intent (symbol_attribute *attr, sym_intent intent, locus *where)
1469 if (check_used (attr, NULL, where))
1472 if (attr->intent == INTENT_UNKNOWN)
1474 attr->intent = intent;
1475 return check_conflict (attr, NULL, where);
1479 where = &gfc_current_locus;
1481 gfc_error ("INTENT (%s) conflicts with INTENT(%s) at %L",
1482 gfc_intent_string (attr->intent),
1483 gfc_intent_string (intent), where);
1489 /* No checks for use-association in public and private statements. */
1492 gfc_add_access (symbol_attribute *attr, gfc_access access,
1493 const char *name, locus *where)
1496 if (attr->access == ACCESS_UNKNOWN
1497 || (attr->use_assoc && attr->access != ACCESS_PRIVATE))
1499 attr->access = access;
1500 return check_conflict (attr, name, where);
1504 where = &gfc_current_locus;
1505 gfc_error ("ACCESS specification at %L was already specified", where);
1511 /* Set the is_bind_c field for the given symbol_attribute. */
1514 gfc_add_is_bind_c (symbol_attribute *attr, const char *name, locus *where,
1515 int is_proc_lang_bind_spec)
1518 if (is_proc_lang_bind_spec == 0 && attr->flavor == FL_PROCEDURE)
1519 gfc_error_now ("BIND(C) attribute at %L can only be used for "
1520 "variables or common blocks", where);
1521 else if (attr->is_bind_c)
1522 gfc_error_now ("Duplicate BIND attribute specified at %L", where);
1524 attr->is_bind_c = 1;
1527 where = &gfc_current_locus;
1529 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BIND(C) at %L", where)
1533 return check_conflict (attr, name, where);
1537 /* Set the extension field for the given symbol_attribute. */
1540 gfc_add_extension (symbol_attribute *attr, locus *where)
1543 where = &gfc_current_locus;
1545 if (attr->extension)
1546 gfc_error_now ("Duplicate EXTENDS attribute specified at %L", where);
1548 attr->extension = 1;
1550 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: EXTENDS at %L", where)
1559 gfc_add_explicit_interface (gfc_symbol *sym, ifsrc source,
1560 gfc_formal_arglist * formal, locus *where)
1563 if (check_used (&sym->attr, sym->name, where))
1567 where = &gfc_current_locus;
1569 if (sym->attr.if_source != IFSRC_UNKNOWN
1570 && sym->attr.if_source != IFSRC_DECL)
1572 gfc_error ("Symbol '%s' at %L already has an explicit interface",
1577 if (source == IFSRC_IFBODY && (sym->attr.dimension || sym->attr.allocatable))
1579 gfc_error ("'%s' at %L has attributes specified outside its INTERFACE "
1580 "body", sym->name, where);
1584 sym->formal = formal;
1585 sym->attr.if_source = source;
1591 /* Add a type to a symbol. */
1594 gfc_add_type (gfc_symbol *sym, gfc_typespec *ts, locus *where)
1600 where = &gfc_current_locus;
1603 type = sym->result->ts.type;
1605 type = sym->ts.type;
1607 if (sym->attr.result && type == BT_UNKNOWN && sym->ns->proc_name)
1608 type = sym->ns->proc_name->ts.type;
1610 if (type != BT_UNKNOWN && !(sym->attr.function && sym->attr.implicit_type))
1612 gfc_error ("Symbol '%s' at %L already has basic type of %s", sym->name,
1613 where, gfc_basic_typename (type));
1617 if (sym->attr.procedure && sym->ts.interface)
1619 gfc_error ("Procedure '%s' at %L may not have basic type of %s",
1620 sym->name, where, gfc_basic_typename (ts->type));
1624 flavor = sym->attr.flavor;
1626 if (flavor == FL_PROGRAM || flavor == FL_BLOCK_DATA || flavor == FL_MODULE
1627 || flavor == FL_LABEL
1628 || (flavor == FL_PROCEDURE && sym->attr.subroutine)
1629 || flavor == FL_DERIVED || flavor == FL_NAMELIST)
1631 gfc_error ("Symbol '%s' at %L cannot have a type", sym->name, where);
1640 /* Clears all attributes. */
1643 gfc_clear_attr (symbol_attribute *attr)
1645 memset (attr, 0, sizeof (symbol_attribute));
1649 /* Check for missing attributes in the new symbol. Currently does
1650 nothing, but it's not clear that it is unnecessary yet. */
1653 gfc_missing_attr (symbol_attribute *attr ATTRIBUTE_UNUSED,
1654 locus *where ATTRIBUTE_UNUSED)
1661 /* Copy an attribute to a symbol attribute, bit by bit. Some
1662 attributes have a lot of side-effects but cannot be present given
1663 where we are called from, so we ignore some bits. */
1666 gfc_copy_attr (symbol_attribute *dest, symbol_attribute *src, locus *where)
1668 int is_proc_lang_bind_spec;
1670 /* In line with the other attributes, we only add bits but do not remove
1671 them; cf. also PR 41034. */
1672 dest->ext_attr |= src->ext_attr;
1674 if (src->allocatable && gfc_add_allocatable (dest, where) == FAILURE)
1677 if (src->dimension && gfc_add_dimension (dest, NULL, where) == FAILURE)
1679 if (src->optional && gfc_add_optional (dest, where) == FAILURE)
1681 if (src->pointer && gfc_add_pointer (dest, where) == FAILURE)
1683 if (src->is_protected && gfc_add_protected (dest, NULL, where) == FAILURE)
1685 if (src->save && gfc_add_save (dest, NULL, where) == FAILURE)
1687 if (src->value && gfc_add_value (dest, NULL, where) == FAILURE)
1689 if (src->volatile_ && gfc_add_volatile (dest, NULL, where) == FAILURE)
1691 if (src->asynchronous && gfc_add_asynchronous (dest, NULL, where) == FAILURE)
1693 if (src->threadprivate
1694 && gfc_add_threadprivate (dest, NULL, where) == FAILURE)
1696 if (src->target && gfc_add_target (dest, where) == FAILURE)
1698 if (src->dummy && gfc_add_dummy (dest, NULL, where) == FAILURE)
1700 if (src->result && gfc_add_result (dest, NULL, where) == FAILURE)
1705 if (src->in_namelist && gfc_add_in_namelist (dest, NULL, where) == FAILURE)
1708 if (src->in_common && gfc_add_in_common (dest, NULL, where) == FAILURE)
1711 if (src->generic && gfc_add_generic (dest, NULL, where) == FAILURE)
1713 if (src->function && gfc_add_function (dest, NULL, where) == FAILURE)
1715 if (src->subroutine && gfc_add_subroutine (dest, NULL, where) == FAILURE)
1718 if (src->sequence && gfc_add_sequence (dest, NULL, where) == FAILURE)
1720 if (src->elemental && gfc_add_elemental (dest, where) == FAILURE)
1722 if (src->pure && gfc_add_pure (dest, where) == FAILURE)
1724 if (src->recursive && gfc_add_recursive (dest, where) == FAILURE)
1727 if (src->flavor != FL_UNKNOWN
1728 && gfc_add_flavor (dest, src->flavor, NULL, where) == FAILURE)
1731 if (src->intent != INTENT_UNKNOWN
1732 && gfc_add_intent (dest, src->intent, where) == FAILURE)
1735 if (src->access != ACCESS_UNKNOWN
1736 && gfc_add_access (dest, src->access, NULL, where) == FAILURE)
1739 if (gfc_missing_attr (dest, where) == FAILURE)
1742 if (src->cray_pointer && gfc_add_cray_pointer (dest, where) == FAILURE)
1744 if (src->cray_pointee && gfc_add_cray_pointee (dest, where) == FAILURE)
1747 is_proc_lang_bind_spec = (src->flavor == FL_PROCEDURE ? 1 : 0);
1749 && gfc_add_is_bind_c (dest, NULL, where, is_proc_lang_bind_spec)
1753 if (src->is_c_interop)
1754 dest->is_c_interop = 1;
1758 if (src->external && gfc_add_external (dest, where) == FAILURE)
1760 if (src->intrinsic && gfc_add_intrinsic (dest, where) == FAILURE)
1762 if (src->proc_pointer)
1763 dest->proc_pointer = 1;
1772 /************** Component name management ************/
1774 /* Component names of a derived type form their own little namespaces
1775 that are separate from all other spaces. The space is composed of
1776 a singly linked list of gfc_component structures whose head is
1777 located in the parent symbol. */
1780 /* Add a component name to a symbol. The call fails if the name is
1781 already present. On success, the component pointer is modified to
1782 point to the additional component structure. */
1785 gfc_add_component (gfc_symbol *sym, const char *name,
1786 gfc_component **component)
1788 gfc_component *p, *tail;
1792 for (p = sym->components; p; p = p->next)
1794 if (strcmp (p->name, name) == 0)
1796 gfc_error ("Component '%s' at %C already declared at %L",
1804 if (sym->attr.extension
1805 && gfc_find_component (sym->components->ts.u.derived, name, true, true))
1807 gfc_error ("Component '%s' at %C already in the parent type "
1808 "at %L", name, &sym->components->ts.u.derived->declared_at);
1812 /* Allocate a new component. */
1813 p = gfc_get_component ();
1816 sym->components = p;
1820 p->name = gfc_get_string (name);
1821 p->loc = gfc_current_locus;
1822 p->ts.type = BT_UNKNOWN;
1829 /* Recursive function to switch derived types of all symbol in a
1833 switch_types (gfc_symtree *st, gfc_symbol *from, gfc_symbol *to)
1841 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived == from)
1842 sym->ts.u.derived = to;
1844 switch_types (st->left, from, to);
1845 switch_types (st->right, from, to);
1849 /* This subroutine is called when a derived type is used in order to
1850 make the final determination about which version to use. The
1851 standard requires that a type be defined before it is 'used', but
1852 such types can appear in IMPLICIT statements before the actual
1853 definition. 'Using' in this context means declaring a variable to
1854 be that type or using the type constructor.
1856 If a type is used and the components haven't been defined, then we
1857 have to have a derived type in a parent unit. We find the node in
1858 the other namespace and point the symtree node in this namespace to
1859 that node. Further reference to this name point to the correct
1860 node. If we can't find the node in a parent namespace, then we have
1863 This subroutine takes a pointer to a symbol node and returns a
1864 pointer to the translated node or NULL for an error. Usually there
1865 is no translation and we return the node we were passed. */
1868 gfc_use_derived (gfc_symbol *sym)
1875 if (sym->components != NULL || sym->attr.zero_comp)
1876 return sym; /* Already defined. */
1878 if (sym->ns->parent == NULL)
1881 if (gfc_find_symbol (sym->name, sym->ns->parent, 1, &s))
1883 gfc_error ("Symbol '%s' at %C is ambiguous", sym->name);
1887 if (s == NULL || s->attr.flavor != FL_DERIVED)
1890 /* Get rid of symbol sym, translating all references to s. */
1891 for (i = 0; i < GFC_LETTERS; i++)
1893 t = &sym->ns->default_type[i];
1894 if (t->u.derived == sym)
1898 st = gfc_find_symtree (sym->ns->sym_root, sym->name);
1903 /* Unlink from list of modified symbols. */
1904 gfc_commit_symbol (sym);
1906 switch_types (sym->ns->sym_root, sym, s);
1908 /* TODO: Also have to replace sym -> s in other lists like
1909 namelists, common lists and interface lists. */
1910 gfc_free_symbol (sym);
1915 gfc_error ("Derived type '%s' at %C is being used before it is defined",
1921 /* Given a derived type node and a component name, try to locate the
1922 component structure. Returns the NULL pointer if the component is
1923 not found or the components are private. If noaccess is set, no access
1927 gfc_find_component (gfc_symbol *sym, const char *name,
1928 bool noaccess, bool silent)
1935 sym = gfc_use_derived (sym);
1940 for (p = sym->components; p; p = p->next)
1941 if (strcmp (p->name, name) == 0)
1945 && sym->attr.extension
1946 && sym->components->ts.type == BT_DERIVED)
1948 p = gfc_find_component (sym->components->ts.u.derived, name,
1950 /* Do not overwrite the error. */
1955 if (p == NULL && !silent)
1956 gfc_error ("'%s' at %C is not a member of the '%s' structure",
1959 else if (sym->attr.use_assoc && !noaccess)
1961 if (p->attr.access == ACCESS_PRIVATE)
1964 gfc_error ("Component '%s' at %C is a PRIVATE component of '%s'",
1969 /* If there were components given and all components are private, error
1970 out at this place. */
1971 if (p->attr.access != ACCESS_PUBLIC && sym->component_access == ACCESS_PRIVATE)
1974 gfc_error ("All components of '%s' are PRIVATE in structure"
1975 " constructor at %C", sym->name);
1984 /* Given a symbol, free all of the component structures and everything
1988 free_components (gfc_component *p)
1996 gfc_free_array_spec (p->as);
1997 gfc_free_expr (p->initializer);
2004 /******************** Statement label management ********************/
2006 /* Comparison function for statement labels, used for managing the
2010 compare_st_labels (void *a1, void *b1)
2012 int a = ((gfc_st_label *) a1)->value;
2013 int b = ((gfc_st_label *) b1)->value;
2019 /* Free a single gfc_st_label structure, making sure the tree is not
2020 messed up. This function is called only when some parse error
2024 gfc_free_st_label (gfc_st_label *label)
2030 gfc_delete_bbt (&gfc_current_ns->st_labels, label, compare_st_labels);
2032 if (label->format != NULL)
2033 gfc_free_expr (label->format);
2039 /* Free a whole tree of gfc_st_label structures. */
2042 free_st_labels (gfc_st_label *label)
2048 free_st_labels (label->left);
2049 free_st_labels (label->right);
2051 if (label->format != NULL)
2052 gfc_free_expr (label->format);
2057 /* Given a label number, search for and return a pointer to the label
2058 structure, creating it if it does not exist. */
2061 gfc_get_st_label (int labelno)
2066 /* Find the namespace of the scoping unit:
2067 If we're in a BLOCK construct, jump to the parent namespace. */
2068 ns = gfc_current_ns;
2069 while (ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL)
2072 /* First see if the label is already in this namespace. */
2076 if (lp->value == labelno)
2079 if (lp->value < labelno)
2085 lp = XCNEW (gfc_st_label);
2087 lp->value = labelno;
2088 lp->defined = ST_LABEL_UNKNOWN;
2089 lp->referenced = ST_LABEL_UNKNOWN;
2091 gfc_insert_bbt (&ns->st_labels, lp, compare_st_labels);
2097 /* Called when a statement with a statement label is about to be
2098 accepted. We add the label to the list of the current namespace,
2099 making sure it hasn't been defined previously and referenced
2103 gfc_define_st_label (gfc_st_label *lp, gfc_sl_type type, locus *label_locus)
2107 labelno = lp->value;
2109 if (lp->defined != ST_LABEL_UNKNOWN)
2110 gfc_error ("Duplicate statement label %d at %L and %L", labelno,
2111 &lp->where, label_locus);
2114 lp->where = *label_locus;
2118 case ST_LABEL_FORMAT:
2119 if (lp->referenced == ST_LABEL_TARGET)
2120 gfc_error ("Label %d at %C already referenced as branch target",
2123 lp->defined = ST_LABEL_FORMAT;
2127 case ST_LABEL_TARGET:
2128 if (lp->referenced == ST_LABEL_FORMAT)
2129 gfc_error ("Label %d at %C already referenced as a format label",
2132 lp->defined = ST_LABEL_TARGET;
2137 lp->defined = ST_LABEL_BAD_TARGET;
2138 lp->referenced = ST_LABEL_BAD_TARGET;
2144 /* Reference a label. Given a label and its type, see if that
2145 reference is consistent with what is known about that label,
2146 updating the unknown state. Returns FAILURE if something goes
2150 gfc_reference_st_label (gfc_st_label *lp, gfc_sl_type type)
2152 gfc_sl_type label_type;
2159 labelno = lp->value;
2161 if (lp->defined != ST_LABEL_UNKNOWN)
2162 label_type = lp->defined;
2165 label_type = lp->referenced;
2166 lp->where = gfc_current_locus;
2169 if (label_type == ST_LABEL_FORMAT && type == ST_LABEL_TARGET)
2171 gfc_error ("Label %d at %C previously used as a FORMAT label", labelno);
2176 if ((label_type == ST_LABEL_TARGET || label_type == ST_LABEL_BAD_TARGET)
2177 && type == ST_LABEL_FORMAT)
2179 gfc_error ("Label %d at %C previously used as branch target", labelno);
2184 lp->referenced = type;
2192 /*******A helper function for creating new expressions*************/
2196 gfc_lval_expr_from_sym (gfc_symbol *sym)
2199 lval = gfc_get_expr ();
2200 lval->expr_type = EXPR_VARIABLE;
2201 lval->where = sym->declared_at;
2203 lval->symtree = gfc_find_symtree (sym->ns->sym_root, sym->name);
2205 /* It will always be a full array. */
2206 lval->rank = sym->as ? sym->as->rank : 0;
2209 lval->ref = gfc_get_ref ();
2210 lval->ref->type = REF_ARRAY;
2211 lval->ref->u.ar.type = AR_FULL;
2212 lval->ref->u.ar.dimen = lval->rank;
2213 lval->ref->u.ar.where = sym->declared_at;
2214 lval->ref->u.ar.as = sym->as;
2221 /************** Symbol table management subroutines ****************/
2223 /* Basic details: Fortran 95 requires a potentially unlimited number
2224 of distinct namespaces when compiling a program unit. This case
2225 occurs during a compilation of internal subprograms because all of
2226 the internal subprograms must be read before we can start
2227 generating code for the host.
2229 Given the tricky nature of the Fortran grammar, we must be able to
2230 undo changes made to a symbol table if the current interpretation
2231 of a statement is found to be incorrect. Whenever a symbol is
2232 looked up, we make a copy of it and link to it. All of these
2233 symbols are kept in a singly linked list so that we can commit or
2234 undo the changes at a later time.
2236 A symtree may point to a symbol node outside of its namespace. In
2237 this case, that symbol has been used as a host associated variable
2238 at some previous time. */
2240 /* Allocate a new namespace structure. Copies the implicit types from
2241 PARENT if PARENT_TYPES is set. */
2244 gfc_get_namespace (gfc_namespace *parent, int parent_types)
2251 ns = XCNEW (gfc_namespace);
2252 ns->sym_root = NULL;
2253 ns->uop_root = NULL;
2254 ns->tb_sym_root = NULL;
2255 ns->finalizers = NULL;
2256 ns->default_access = ACCESS_UNKNOWN;
2257 ns->parent = parent;
2259 for (in = GFC_INTRINSIC_BEGIN; in != GFC_INTRINSIC_END; in++)
2261 ns->operator_access[in] = ACCESS_UNKNOWN;
2262 ns->tb_op[in] = NULL;
2265 /* Initialize default implicit types. */
2266 for (i = 'a'; i <= 'z'; i++)
2268 ns->set_flag[i - 'a'] = 0;
2269 ts = &ns->default_type[i - 'a'];
2271 if (parent_types && ns->parent != NULL)
2273 /* Copy parent settings. */
2274 *ts = ns->parent->default_type[i - 'a'];
2278 if (gfc_option.flag_implicit_none != 0)
2284 if ('i' <= i && i <= 'n')
2286 ts->type = BT_INTEGER;
2287 ts->kind = gfc_default_integer_kind;
2292 ts->kind = gfc_default_real_kind;
2302 /* Comparison function for symtree nodes. */
2305 compare_symtree (void *_st1, void *_st2)
2307 gfc_symtree *st1, *st2;
2309 st1 = (gfc_symtree *) _st1;
2310 st2 = (gfc_symtree *) _st2;
2312 return strcmp (st1->name, st2->name);
2316 /* Allocate a new symtree node and associate it with the new symbol. */
2319 gfc_new_symtree (gfc_symtree **root, const char *name)
2323 st = XCNEW (gfc_symtree);
2324 st->name = gfc_get_string (name);
2326 gfc_insert_bbt (root, st, compare_symtree);
2331 /* Delete a symbol from the tree. Does not free the symbol itself! */
2334 gfc_delete_symtree (gfc_symtree **root, const char *name)
2336 gfc_symtree st, *st0;
2338 st0 = gfc_find_symtree (*root, name);
2340 st.name = gfc_get_string (name);
2341 gfc_delete_bbt (root, &st, compare_symtree);
2347 /* Given a root symtree node and a name, try to find the symbol within
2348 the namespace. Returns NULL if the symbol is not found. */
2351 gfc_find_symtree (gfc_symtree *st, const char *name)
2357 c = strcmp (name, st->name);
2361 st = (c < 0) ? st->left : st->right;
2368 /* Return a symtree node with a name that is guaranteed to be unique
2369 within the namespace and corresponds to an illegal fortran name. */
2372 gfc_get_unique_symtree (gfc_namespace *ns)
2374 char name[GFC_MAX_SYMBOL_LEN + 1];
2375 static int serial = 0;
2377 sprintf (name, "@%d", serial++);
2378 return gfc_new_symtree (&ns->sym_root, name);
2382 /* Given a name find a user operator node, creating it if it doesn't
2383 exist. These are much simpler than symbols because they can't be
2384 ambiguous with one another. */
2387 gfc_get_uop (const char *name)
2392 st = gfc_find_symtree (gfc_current_ns->uop_root, name);
2396 st = gfc_new_symtree (&gfc_current_ns->uop_root, name);
2398 uop = st->n.uop = XCNEW (gfc_user_op);
2399 uop->name = gfc_get_string (name);
2400 uop->access = ACCESS_UNKNOWN;
2401 uop->ns = gfc_current_ns;
2407 /* Given a name find the user operator node. Returns NULL if it does
2411 gfc_find_uop (const char *name, gfc_namespace *ns)
2416 ns = gfc_current_ns;
2418 st = gfc_find_symtree (ns->uop_root, name);
2419 return (st == NULL) ? NULL : st->n.uop;
2423 /* Remove a gfc_symbol structure and everything it points to. */
2426 gfc_free_symbol (gfc_symbol *sym)
2432 gfc_free_array_spec (sym->as);
2434 free_components (sym->components);
2436 gfc_free_expr (sym->value);
2438 gfc_free_namelist (sym->namelist);
2440 gfc_free_namespace (sym->formal_ns);
2442 if (!sym->attr.generic_copy)
2443 gfc_free_interface (sym->generic);
2445 gfc_free_formal_arglist (sym->formal);
2447 gfc_free_namespace (sym->f2k_derived);
2453 /* Allocate and initialize a new symbol node. */
2456 gfc_new_symbol (const char *name, gfc_namespace *ns)
2460 p = XCNEW (gfc_symbol);
2462 gfc_clear_ts (&p->ts);
2463 gfc_clear_attr (&p->attr);
2466 p->declared_at = gfc_current_locus;
2468 if (strlen (name) > GFC_MAX_SYMBOL_LEN)
2469 gfc_internal_error ("new_symbol(): Symbol name too long");
2471 p->name = gfc_get_string (name);
2473 /* Make sure flags for symbol being C bound are clear initially. */
2474 p->attr.is_bind_c = 0;
2475 p->attr.is_iso_c = 0;
2476 /* Make sure the binding label field has a Nul char to start. */
2477 p->binding_label[0] = '\0';
2479 /* Clear the ptrs we may need. */
2480 p->common_block = NULL;
2481 p->f2k_derived = NULL;
2487 /* Generate an error if a symbol is ambiguous. */
2490 ambiguous_symbol (const char *name, gfc_symtree *st)
2493 if (st->n.sym->module)
2494 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2495 "from module '%s'", name, st->n.sym->name, st->n.sym->module);
2497 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2498 "from current program unit", name, st->n.sym->name);
2502 /* If we're in a SELECT TYPE block, check if the variable 'st' matches any
2503 selector on the stack. If yes, replace it by the corresponding temporary. */
2506 select_type_insert_tmp (gfc_symtree **st)
2508 gfc_select_type_stack *stack = select_type_stack;
2509 for (; stack; stack = stack->prev)
2510 if ((*st)->n.sym == stack->selector && stack->tmp)
2515 /* Search for a symtree starting in the current namespace, resorting to
2516 any parent namespaces if requested by a nonzero parent_flag.
2517 Returns nonzero if the name is ambiguous. */
2520 gfc_find_sym_tree (const char *name, gfc_namespace *ns, int parent_flag,
2521 gfc_symtree **result)
2526 ns = gfc_current_ns;
2530 st = gfc_find_symtree (ns->sym_root, name);
2533 select_type_insert_tmp (&st);
2536 /* Ambiguous generic interfaces are permitted, as long
2537 as the specific interfaces are different. */
2538 if (st->ambiguous && !st->n.sym->attr.generic)
2540 ambiguous_symbol (name, st);
2559 /* Same, but returns the symbol instead. */
2562 gfc_find_symbol (const char *name, gfc_namespace *ns, int parent_flag,
2563 gfc_symbol **result)
2568 i = gfc_find_sym_tree (name, ns, parent_flag, &st);
2573 *result = st->n.sym;
2579 /* Save symbol with the information necessary to back it out. */
2582 save_symbol_data (gfc_symbol *sym)
2585 if (sym->gfc_new || sym->old_symbol != NULL)
2588 sym->old_symbol = XCNEW (gfc_symbol);
2589 *(sym->old_symbol) = *sym;
2591 sym->tlink = changed_syms;
2596 /* Given a name, find a symbol, or create it if it does not exist yet
2597 in the current namespace. If the symbol is found we make sure that
2600 The integer return code indicates
2602 1 The symbol name was ambiguous
2603 2 The name meant to be established was already host associated.
2605 So if the return value is nonzero, then an error was issued. */
2608 gfc_get_sym_tree (const char *name, gfc_namespace *ns, gfc_symtree **result,
2609 bool allow_subroutine)
2614 /* This doesn't usually happen during resolution. */
2616 ns = gfc_current_ns;
2618 /* Try to find the symbol in ns. */
2619 st = gfc_find_symtree (ns->sym_root, name);
2623 /* If not there, create a new symbol. */
2624 p = gfc_new_symbol (name, ns);
2626 /* Add to the list of tentative symbols. */
2627 p->old_symbol = NULL;
2628 p->tlink = changed_syms;
2633 st = gfc_new_symtree (&ns->sym_root, name);
2640 /* Make sure the existing symbol is OK. Ambiguous
2641 generic interfaces are permitted, as long as the
2642 specific interfaces are different. */
2643 if (st->ambiguous && !st->n.sym->attr.generic)
2645 ambiguous_symbol (name, st);
2650 if (p->ns != ns && (!p->attr.function || ns->proc_name != p)
2651 && !(allow_subroutine && p->attr.subroutine)
2652 && !(ns->proc_name && ns->proc_name->attr.if_source == IFSRC_IFBODY
2653 && (ns->has_import_set || p->attr.imported)))
2655 /* Symbol is from another namespace. */
2656 gfc_error ("Symbol '%s' at %C has already been host associated",
2663 /* Copy in case this symbol is changed. */
2664 save_symbol_data (p);
2673 gfc_get_symbol (const char *name, gfc_namespace *ns, gfc_symbol **result)
2678 i = gfc_get_sym_tree (name, ns, &st, false);
2683 *result = st->n.sym;
2690 /* Subroutine that searches for a symbol, creating it if it doesn't
2691 exist, but tries to host-associate the symbol if possible. */
2694 gfc_get_ha_sym_tree (const char *name, gfc_symtree **result)
2699 i = gfc_find_sym_tree (name, gfc_current_ns, 0, &st);
2703 save_symbol_data (st->n.sym);
2708 if (gfc_current_ns->parent != NULL)
2710 i = gfc_find_sym_tree (name, gfc_current_ns->parent, 1, &st);
2721 return gfc_get_sym_tree (name, gfc_current_ns, result, false);
2726 gfc_get_ha_symbol (const char *name, gfc_symbol **result)
2731 i = gfc_get_ha_sym_tree (name, &st);
2734 *result = st->n.sym;
2741 /* Return true if both symbols could refer to the same data object. Does
2742 not take account of aliasing due to equivalence statements. */
2745 gfc_symbols_could_alias (gfc_symbol *lsym, gfc_symbol *rsym)
2747 /* Aliasing isn't possible if the symbols have different base types. */
2748 if (gfc_compare_types (&lsym->ts, &rsym->ts) == 0)
2751 /* Pointers can point to other pointers, target objects and allocatable
2752 objects. Two allocatable objects cannot share the same storage. */
2753 if (lsym->attr.pointer
2754 && (rsym->attr.pointer || rsym->attr.allocatable || rsym->attr.target))
2756 if (lsym->attr.target && rsym->attr.pointer)
2758 if (lsym->attr.allocatable && rsym->attr.pointer)
2765 /* Undoes all the changes made to symbols in the current statement.
2766 This subroutine is made simpler due to the fact that attributes are
2767 never removed once added. */
2770 gfc_undo_symbols (void)
2772 gfc_symbol *p, *q, *old;
2773 tentative_tbp *tbp, *tbq;
2775 for (p = changed_syms; p; p = q)
2781 /* Symbol was new. */
2782 if (p->attr.in_common && p->common_block && p->common_block->head)
2784 /* If the symbol was added to any common block, it
2785 needs to be removed to stop the resolver looking
2786 for a (possibly) dead symbol. */
2788 if (p->common_block->head == p)
2789 p->common_block->head = p->common_next;
2792 gfc_symbol *cparent, *csym;
2794 cparent = p->common_block->head;
2795 csym = cparent->common_next;
2800 csym = csym->common_next;
2803 gcc_assert(cparent->common_next == p);
2805 cparent->common_next = csym->common_next;
2809 gfc_delete_symtree (&p->ns->sym_root, p->name);
2813 gfc_internal_error ("gfc_undo_symbols(): Negative refs");
2815 gfc_free_symbol (p);
2819 /* Restore previous state of symbol. Just copy simple stuff. */
2821 old = p->old_symbol;
2823 p->ts.type = old->ts.type;
2824 p->ts.kind = old->ts.kind;
2826 p->attr = old->attr;
2828 if (p->value != old->value)
2830 gfc_free_expr (old->value);
2834 if (p->as != old->as)
2837 gfc_free_array_spec (p->as);
2841 p->generic = old->generic;
2842 p->component_access = old->component_access;
2844 if (p->namelist != NULL && old->namelist == NULL)
2846 gfc_free_namelist (p->namelist);
2851 if (p->namelist_tail != old->namelist_tail)
2853 gfc_free_namelist (old->namelist_tail);
2854 old->namelist_tail->next = NULL;
2858 p->namelist_tail = old->namelist_tail;
2860 if (p->formal != old->formal)
2862 gfc_free_formal_arglist (p->formal);
2863 p->formal = old->formal;
2866 gfc_free (p->old_symbol);
2867 p->old_symbol = NULL;
2871 changed_syms = NULL;
2873 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
2876 /* Procedure is already marked `error' by default. */
2879 tentative_tbp_list = NULL;
2883 /* Free sym->old_symbol. sym->old_symbol is mostly a shallow copy of sym; the
2884 components of old_symbol that might need deallocation are the "allocatables"
2885 that are restored in gfc_undo_symbols(), with two exceptions: namelist and
2886 namelist_tail. In case these differ between old_symbol and sym, it's just
2887 because sym->namelist has gotten a few more items. */
2890 free_old_symbol (gfc_symbol *sym)
2893 if (sym->old_symbol == NULL)
2896 if (sym->old_symbol->as != sym->as)
2897 gfc_free_array_spec (sym->old_symbol->as);
2899 if (sym->old_symbol->value != sym->value)
2900 gfc_free_expr (sym->old_symbol->value);
2902 if (sym->old_symbol->formal != sym->formal)
2903 gfc_free_formal_arglist (sym->old_symbol->formal);
2905 gfc_free (sym->old_symbol);
2906 sym->old_symbol = NULL;
2910 /* Makes the changes made in the current statement permanent-- gets
2911 rid of undo information. */
2914 gfc_commit_symbols (void)
2917 tentative_tbp *tbp, *tbq;
2919 for (p = changed_syms; p; p = q)
2925 free_old_symbol (p);
2927 changed_syms = NULL;
2929 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
2932 tbp->proc->error = 0;
2935 tentative_tbp_list = NULL;
2939 /* Makes the changes made in one symbol permanent -- gets rid of undo
2943 gfc_commit_symbol (gfc_symbol *sym)
2947 if (changed_syms == sym)
2948 changed_syms = sym->tlink;
2951 for (p = changed_syms; p; p = p->tlink)
2952 if (p->tlink == sym)
2954 p->tlink = sym->tlink;
2963 free_old_symbol (sym);
2967 /* Recursively free trees containing type-bound procedures. */
2970 free_tb_tree (gfc_symtree *t)
2975 free_tb_tree (t->left);
2976 free_tb_tree (t->right);
2978 /* TODO: Free type-bound procedure structs themselves; probably needs some
2979 sort of ref-counting mechanism. */
2985 /* Recursive function that deletes an entire tree and all the common
2986 head structures it points to. */
2989 free_common_tree (gfc_symtree * common_tree)
2991 if (common_tree == NULL)
2994 free_common_tree (common_tree->left);
2995 free_common_tree (common_tree->right);
2997 gfc_free (common_tree);
3001 /* Recursive function that deletes an entire tree and all the user
3002 operator nodes that it contains. */
3005 free_uop_tree (gfc_symtree *uop_tree)
3007 if (uop_tree == NULL)
3010 free_uop_tree (uop_tree->left);
3011 free_uop_tree (uop_tree->right);
3013 gfc_free_interface (uop_tree->n.uop->op);
3014 gfc_free (uop_tree->n.uop);
3015 gfc_free (uop_tree);
3019 /* Recursive function that deletes an entire tree and all the symbols
3020 that it contains. */
3023 free_sym_tree (gfc_symtree *sym_tree)
3028 if (sym_tree == NULL)
3031 free_sym_tree (sym_tree->left);
3032 free_sym_tree (sym_tree->right);
3034 sym = sym_tree->n.sym;
3038 gfc_internal_error ("free_sym_tree(): Negative refs");
3040 if (sym->formal_ns != NULL && sym->refs == 1)
3042 /* As formal_ns contains a reference to sym, delete formal_ns just
3043 before the deletion of sym. */
3044 ns = sym->formal_ns;
3045 sym->formal_ns = NULL;
3046 gfc_free_namespace (ns);
3048 else if (sym->refs == 0)
3050 /* Go ahead and delete the symbol. */
3051 gfc_free_symbol (sym);
3054 gfc_free (sym_tree);
3058 /* Free the derived type list. */
3061 gfc_free_dt_list (void)
3063 gfc_dt_list *dt, *n;
3065 for (dt = gfc_derived_types; dt; dt = n)
3071 gfc_derived_types = NULL;
3075 /* Free the gfc_equiv_info's. */
3078 gfc_free_equiv_infos (gfc_equiv_info *s)
3082 gfc_free_equiv_infos (s->next);
3087 /* Free the gfc_equiv_lists. */
3090 gfc_free_equiv_lists (gfc_equiv_list *l)
3094 gfc_free_equiv_lists (l->next);
3095 gfc_free_equiv_infos (l->equiv);
3100 /* Free a finalizer procedure list. */
3103 gfc_free_finalizer (gfc_finalizer* el)
3109 --el->proc_sym->refs;
3110 if (!el->proc_sym->refs)
3111 gfc_free_symbol (el->proc_sym);
3119 gfc_free_finalizer_list (gfc_finalizer* list)
3123 gfc_finalizer* current = list;
3125 gfc_free_finalizer (current);
3130 /* Create a new gfc_charlen structure and add it to a namespace.
3131 If 'old_cl' is given, the newly created charlen will be a copy of it. */
3134 gfc_new_charlen (gfc_namespace *ns, gfc_charlen *old_cl)
3137 cl = gfc_get_charlen ();
3139 /* Put into namespace. */
3140 cl->next = ns->cl_list;
3146 cl->length = gfc_copy_expr (old_cl->length);
3147 cl->length_from_typespec = old_cl->length_from_typespec;
3148 cl->backend_decl = old_cl->backend_decl;
3149 cl->passed_length = old_cl->passed_length;
3150 cl->resolved = old_cl->resolved;
3157 /* Free the charlen list from cl to end (end is not freed).
3158 Free the whole list if end is NULL. */
3160 void gfc_free_charlen (gfc_charlen *cl, gfc_charlen *end)
3164 for (; cl != end; cl = cl2)
3169 gfc_free_expr (cl->length);
3175 /* Free a namespace structure and everything below it. Interface
3176 lists associated with intrinsic operators are not freed. These are
3177 taken care of when a specific name is freed. */
3180 gfc_free_namespace (gfc_namespace *ns)
3182 gfc_namespace *p, *q;
3191 gcc_assert (ns->refs == 0);
3193 gfc_free_statements (ns->code);
3195 free_sym_tree (ns->sym_root);
3196 free_uop_tree (ns->uop_root);
3197 free_common_tree (ns->common_root);
3198 free_tb_tree (ns->tb_sym_root);
3199 free_tb_tree (ns->tb_uop_root);
3200 gfc_free_finalizer_list (ns->finalizers);
3201 gfc_free_charlen (ns->cl_list, NULL);
3202 free_st_labels (ns->st_labels);
3204 gfc_free_equiv (ns->equiv);
3205 gfc_free_equiv_lists (ns->equiv_lists);
3206 gfc_free_use_stmts (ns->use_stmts);
3208 for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++)
3209 gfc_free_interface (ns->op[i]);
3211 gfc_free_data (ns->data);
3215 /* Recursively free any contained namespaces. */
3220 gfc_free_namespace (q);
3226 gfc_symbol_init_2 (void)
3229 gfc_current_ns = gfc_get_namespace (NULL, 0);
3234 gfc_symbol_done_2 (void)
3237 gfc_free_namespace (gfc_current_ns);
3238 gfc_current_ns = NULL;
3239 gfc_free_dt_list ();
3243 /* Clear mark bits from symbol nodes associated with a symtree node. */
3246 clear_sym_mark (gfc_symtree *st)
3249 st->n.sym->mark = 0;
3253 /* Recursively traverse the symtree nodes. */
3256 gfc_traverse_symtree (gfc_symtree *st, void (*func) (gfc_symtree *))
3261 gfc_traverse_symtree (st->left, func);
3263 gfc_traverse_symtree (st->right, func);
3267 /* Recursive namespace traversal function. */
3270 traverse_ns (gfc_symtree *st, void (*func) (gfc_symbol *))
3276 traverse_ns (st->left, func);
3278 if (st->n.sym->mark == 0)
3279 (*func) (st->n.sym);
3280 st->n.sym->mark = 1;
3282 traverse_ns (st->right, func);
3286 /* Call a given function for all symbols in the namespace. We take
3287 care that each gfc_symbol node is called exactly once. */
3290 gfc_traverse_ns (gfc_namespace *ns, void (*func) (gfc_symbol *))
3293 gfc_traverse_symtree (ns->sym_root, clear_sym_mark);
3295 traverse_ns (ns->sym_root, func);
3299 /* Return TRUE when name is the name of an intrinsic type. */
3302 gfc_is_intrinsic_typename (const char *name)
3304 if (strcmp (name, "integer") == 0
3305 || strcmp (name, "real") == 0
3306 || strcmp (name, "character") == 0
3307 || strcmp (name, "logical") == 0
3308 || strcmp (name, "complex") == 0
3309 || strcmp (name, "doubleprecision") == 0
3310 || strcmp (name, "doublecomplex") == 0)
3317 /* Return TRUE if the symbol is an automatic variable. */
3320 gfc_is_var_automatic (gfc_symbol *sym)
3322 /* Pointer and allocatable variables are never automatic. */
3323 if (sym->attr.pointer || sym->attr.allocatable)
3325 /* Check for arrays with non-constant size. */
3326 if (sym->attr.dimension && sym->as
3327 && !gfc_is_compile_time_shape (sym->as))
3329 /* Check for non-constant length character variables. */
3330 if (sym->ts.type == BT_CHARACTER
3332 && !gfc_is_constant_expr (sym->ts.u.cl->length))
3337 /* Given a symbol, mark it as SAVEd if it is allowed. */
3340 save_symbol (gfc_symbol *sym)
3343 if (sym->attr.use_assoc)
3346 if (sym->attr.in_common
3349 || sym->attr.flavor != FL_VARIABLE)
3351 /* Automatic objects are not saved. */
3352 if (gfc_is_var_automatic (sym))
3354 gfc_add_save (&sym->attr, sym->name, &sym->declared_at);
3358 /* Mark those symbols which can be SAVEd as such. */
3361 gfc_save_all (gfc_namespace *ns)
3363 gfc_traverse_ns (ns, save_symbol);
3368 /* Make sure that no changes to symbols are pending. */
3371 gfc_symbol_state(void) {
3373 if (changed_syms != NULL)
3374 gfc_internal_error("Symbol changes still pending!");
3379 /************** Global symbol handling ************/
3382 /* Search a tree for the global symbol. */
3385 gfc_find_gsymbol (gfc_gsymbol *symbol, const char *name)
3394 c = strcmp (name, symbol->name);
3398 symbol = (c < 0) ? symbol->left : symbol->right;
3405 /* Compare two global symbols. Used for managing the BB tree. */
3408 gsym_compare (void *_s1, void *_s2)
3410 gfc_gsymbol *s1, *s2;
3412 s1 = (gfc_gsymbol *) _s1;
3413 s2 = (gfc_gsymbol *) _s2;
3414 return strcmp (s1->name, s2->name);
3418 /* Get a global symbol, creating it if it doesn't exist. */
3421 gfc_get_gsymbol (const char *name)
3425 s = gfc_find_gsymbol (gfc_gsym_root, name);
3429 s = XCNEW (gfc_gsymbol);
3430 s->type = GSYM_UNKNOWN;
3431 s->name = gfc_get_string (name);
3433 gfc_insert_bbt (&gfc_gsym_root, s, gsym_compare);
3440 get_iso_c_binding_dt (int sym_id)
3442 gfc_dt_list *dt_list;
3444 dt_list = gfc_derived_types;
3446 /* Loop through the derived types in the name list, searching for
3447 the desired symbol from iso_c_binding. Search the parent namespaces
3448 if necessary and requested to (parent_flag). */
3449 while (dt_list != NULL)
3451 if (dt_list->derived->from_intmod != INTMOD_NONE
3452 && dt_list->derived->intmod_sym_id == sym_id)
3453 return dt_list->derived;
3455 dt_list = dt_list->next;
3462 /* Verifies that the given derived type symbol, derived_sym, is interoperable
3463 with C. This is necessary for any derived type that is BIND(C) and for
3464 derived types that are parameters to functions that are BIND(C). All
3465 fields of the derived type are required to be interoperable, and are tested
3466 for such. If an error occurs, the errors are reported here, allowing for
3467 multiple errors to be handled for a single derived type. */
3470 verify_bind_c_derived_type (gfc_symbol *derived_sym)
3472 gfc_component *curr_comp = NULL;
3473 gfc_try is_c_interop = FAILURE;
3474 gfc_try retval = SUCCESS;
3476 if (derived_sym == NULL)
3477 gfc_internal_error ("verify_bind_c_derived_type(): Given symbol is "
3478 "unexpectedly NULL");
3480 /* If we've already looked at this derived symbol, do not look at it again
3481 so we don't repeat warnings/errors. */
3482 if (derived_sym->ts.is_c_interop)
3485 /* The derived type must have the BIND attribute to be interoperable
3486 J3/04-007, Section 15.2.3. */
3487 if (derived_sym->attr.is_bind_c != 1)
3489 derived_sym->ts.is_c_interop = 0;
3490 gfc_error_now ("Derived type '%s' declared at %L must have the BIND "
3491 "attribute to be C interoperable", derived_sym->name,
3492 &(derived_sym->declared_at));
3496 curr_comp = derived_sym->components;
3498 /* TODO: is this really an error? */
3499 if (curr_comp == NULL)
3501 gfc_error ("Derived type '%s' at %L is empty",
3502 derived_sym->name, &(derived_sym->declared_at));
3506 /* Initialize the derived type as being C interoperable.
3507 If we find an error in the components, this will be set false. */
3508 derived_sym->ts.is_c_interop = 1;
3510 /* Loop through the list of components to verify that the kind of
3511 each is a C interoperable type. */
3514 /* The components cannot be pointers (fortran sense).
3515 J3/04-007, Section 15.2.3, C1505. */
3516 if (curr_comp->attr.pointer != 0)
3518 gfc_error ("Component '%s' at %L cannot have the "
3519 "POINTER attribute because it is a member "
3520 "of the BIND(C) derived type '%s' at %L",
3521 curr_comp->name, &(curr_comp->loc),
3522 derived_sym->name, &(derived_sym->declared_at));
3526 if (curr_comp->attr.proc_pointer != 0)
3528 gfc_error ("Procedure pointer component '%s' at %L cannot be a member"
3529 " of the BIND(C) derived type '%s' at %L", curr_comp->name,
3530 &curr_comp->loc, derived_sym->name,
3531 &derived_sym->declared_at);
3535 /* The components cannot be allocatable.
3536 J3/04-007, Section 15.2.3, C1505. */
3537 if (curr_comp->attr.allocatable != 0)
3539 gfc_error ("Component '%s' at %L cannot have the "
3540 "ALLOCATABLE attribute because it is a member "
3541 "of the BIND(C) derived type '%s' at %L",
3542 curr_comp->name, &(curr_comp->loc),
3543 derived_sym->name, &(derived_sym->declared_at));
3547 /* BIND(C) derived types must have interoperable components. */
3548 if (curr_comp->ts.type == BT_DERIVED
3549 && curr_comp->ts.u.derived->ts.is_iso_c != 1
3550 && curr_comp->ts.u.derived != derived_sym)
3552 /* This should be allowed; the draft says a derived-type can not
3553 have type parameters if it is has the BIND attribute. Type
3554 parameters seem to be for making parameterized derived types.
3555 There's no need to verify the type if it is c_ptr/c_funptr. */
3556 retval = verify_bind_c_derived_type (curr_comp->ts.u.derived);
3560 /* Grab the typespec for the given component and test the kind. */
3561 is_c_interop = verify_c_interop (&(curr_comp->ts));
3563 if (is_c_interop != SUCCESS)
3565 /* Report warning and continue since not fatal. The
3566 draft does specify a constraint that requires all fields
3567 to interoperate, but if the user says real(4), etc., it
3568 may interoperate with *something* in C, but the compiler
3569 most likely won't know exactly what. Further, it may not
3570 interoperate with the same data type(s) in C if the user
3571 recompiles with different flags (e.g., -m32 and -m64 on
3572 x86_64 and using integer(4) to claim interop with a
3574 if (derived_sym->attr.is_bind_c == 1)
3575 /* If the derived type is bind(c), all fields must be
3577 gfc_warning ("Component '%s' in derived type '%s' at %L "
3578 "may not be C interoperable, even though "
3579 "derived type '%s' is BIND(C)",
3580 curr_comp->name, derived_sym->name,
3581 &(curr_comp->loc), derived_sym->name);
3583 /* If derived type is param to bind(c) routine, or to one
3584 of the iso_c_binding procs, it must be interoperable, so
3585 all fields must interop too. */
3586 gfc_warning ("Component '%s' in derived type '%s' at %L "
3587 "may not be C interoperable",
3588 curr_comp->name, derived_sym->name,
3593 curr_comp = curr_comp->next;
3594 } while (curr_comp != NULL);
3597 /* Make sure we don't have conflicts with the attributes. */
3598 if (derived_sym->attr.access == ACCESS_PRIVATE)
3600 gfc_error ("Derived type '%s' at %L cannot be declared with both "
3601 "PRIVATE and BIND(C) attributes", derived_sym->name,
3602 &(derived_sym->declared_at));
3606 if (derived_sym->attr.sequence != 0)
3608 gfc_error ("Derived type '%s' at %L cannot have the SEQUENCE "
3609 "attribute because it is BIND(C)", derived_sym->name,
3610 &(derived_sym->declared_at));
3614 /* Mark the derived type as not being C interoperable if we found an
3615 error. If there were only warnings, proceed with the assumption
3616 it's interoperable. */
3617 if (retval == FAILURE)
3618 derived_sym->ts.is_c_interop = 0;
3624 /* Generate symbols for the named constants c_null_ptr and c_null_funptr. */
3627 gen_special_c_interop_ptr (int ptr_id, const char *ptr_name,
3628 const char *module_name)
3630 gfc_symtree *tmp_symtree;
3631 gfc_symbol *tmp_sym;
3633 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, ptr_name);
3635 if (tmp_symtree != NULL)
3636 tmp_sym = tmp_symtree->n.sym;
3640 gfc_internal_error ("gen_special_c_interop_ptr(): Unable to "
3641 "create symbol for %s", ptr_name);
3644 /* Set up the symbol's important fields. Save attr required so we can
3645 initialize the ptr to NULL. */
3646 tmp_sym->attr.save = SAVE_EXPLICIT;
3647 tmp_sym->ts.is_c_interop = 1;
3648 tmp_sym->attr.is_c_interop = 1;
3649 tmp_sym->ts.is_iso_c = 1;
3650 tmp_sym->ts.type = BT_DERIVED;
3652 /* The c_ptr and c_funptr derived types will provide the
3653 definition for c_null_ptr and c_null_funptr, respectively. */
3654 if (ptr_id == ISOCBINDING_NULL_PTR)
3655 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_PTR);
3657 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3658 if (tmp_sym->ts.u.derived == NULL)
3660 /* This can occur if the user forgot to declare c_ptr or
3661 c_funptr and they're trying to use one of the procedures
3662 that has arg(s) of the missing type. In this case, a
3663 regular version of the thing should have been put in the
3665 generate_isocbinding_symbol (module_name, ptr_id == ISOCBINDING_NULL_PTR
3666 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR,
3667 (const char *) (ptr_id == ISOCBINDING_NULL_PTR
3668 ? "_gfortran_iso_c_binding_c_ptr"
3669 : "_gfortran_iso_c_binding_c_funptr"));
3671 tmp_sym->ts.u.derived =
3672 get_iso_c_binding_dt (ptr_id == ISOCBINDING_NULL_PTR
3673 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR);
3676 /* Module name is some mangled version of iso_c_binding. */
3677 tmp_sym->module = gfc_get_string (module_name);
3679 /* Say it's from the iso_c_binding module. */
3680 tmp_sym->attr.is_iso_c = 1;
3682 tmp_sym->attr.use_assoc = 1;
3683 tmp_sym->attr.is_bind_c = 1;
3684 /* Set the binding_label. */
3685 sprintf (tmp_sym->binding_label, "%s_%s", module_name, tmp_sym->name);
3687 /* Set the c_address field of c_null_ptr and c_null_funptr to
3688 the value of NULL. */
3689 tmp_sym->value = gfc_get_expr ();
3690 tmp_sym->value->expr_type = EXPR_STRUCTURE;
3691 tmp_sym->value->ts.type = BT_DERIVED;
3692 tmp_sym->value->ts.u.derived = tmp_sym->ts.u.derived;
3693 /* Create a constructor with no expr, that way we can recognize if the user
3694 tries to call the structure constructor for one of the iso_c_binding
3695 derived types during resolution (resolve_structure_cons). */
3696 tmp_sym->value->value.constructor = gfc_get_constructor ();
3697 /* Must declare c_null_ptr and c_null_funptr as having the
3698 PARAMETER attribute so they can be used in init expressions. */
3699 tmp_sym->attr.flavor = FL_PARAMETER;
3705 /* Add a formal argument, gfc_formal_arglist, to the
3706 end of the given list of arguments. Set the reference to the
3707 provided symbol, param_sym, in the argument. */
3710 add_formal_arg (gfc_formal_arglist **head,
3711 gfc_formal_arglist **tail,
3712 gfc_formal_arglist *formal_arg,
3713 gfc_symbol *param_sym)
3715 /* Put in list, either as first arg or at the tail (curr arg). */
3717 *head = *tail = formal_arg;
3720 (*tail)->next = formal_arg;
3721 (*tail) = formal_arg;
3724 (*tail)->sym = param_sym;
3725 (*tail)->next = NULL;
3731 /* Generates a symbol representing the CPTR argument to an
3732 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3733 CPTR and add it to the provided argument list. */
3736 gen_cptr_param (gfc_formal_arglist **head,
3737 gfc_formal_arglist **tail,
3738 const char *module_name,
3739 gfc_namespace *ns, const char *c_ptr_name,
3742 gfc_symbol *param_sym = NULL;
3743 gfc_symbol *c_ptr_sym = NULL;
3744 gfc_symtree *param_symtree = NULL;
3745 gfc_formal_arglist *formal_arg = NULL;
3746 const char *c_ptr_in;
3747 const char *c_ptr_type = NULL;
3749 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3750 c_ptr_type = "_gfortran_iso_c_binding_c_funptr";
3752 c_ptr_type = "_gfortran_iso_c_binding_c_ptr";
3754 if(c_ptr_name == NULL)
3755 c_ptr_in = "gfc_cptr__";
3757 c_ptr_in = c_ptr_name;
3758 gfc_get_sym_tree (c_ptr_in, ns, ¶m_symtree, false);
3759 if (param_symtree != NULL)
3760 param_sym = param_symtree->n.sym;
3762 gfc_internal_error ("gen_cptr_param(): Unable to "
3763 "create symbol for %s", c_ptr_in);
3765 /* Set up the appropriate fields for the new c_ptr param sym. */
3767 param_sym->attr.flavor = FL_DERIVED;
3768 param_sym->ts.type = BT_DERIVED;
3769 param_sym->attr.intent = INTENT_IN;
3770 param_sym->attr.dummy = 1;
3772 /* This will pass the ptr to the iso_c routines as a (void *). */
3773 param_sym->attr.value = 1;
3774 param_sym->attr.use_assoc = 1;
3776 /* Get the symbol for c_ptr or c_funptr, no matter what it's name is
3778 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3779 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3781 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_PTR);
3782 if (c_ptr_sym == NULL)
3784 /* This can happen if the user did not define c_ptr but they are
3785 trying to use one of the iso_c_binding functions that need it. */
3786 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3787 generate_isocbinding_symbol (module_name, ISOCBINDING_FUNPTR,
3788 (const char *)c_ptr_type);
3790 generate_isocbinding_symbol (module_name, ISOCBINDING_PTR,
3791 (const char *)c_ptr_type);
3793 gfc_get_ha_symbol (c_ptr_type, &(c_ptr_sym));
3796 param_sym->ts.u.derived = c_ptr_sym;
3797 param_sym->module = gfc_get_string (module_name);
3799 /* Make new formal arg. */
3800 formal_arg = gfc_get_formal_arglist ();
3801 /* Add arg to list of formal args (the CPTR arg). */
3802 add_formal_arg (head, tail, formal_arg, param_sym);
3806 /* Generates a symbol representing the FPTR argument to an
3807 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3808 FPTR and add it to the provided argument list. */
3811 gen_fptr_param (gfc_formal_arglist **head,
3812 gfc_formal_arglist **tail,
3813 const char *module_name,
3814 gfc_namespace *ns, const char *f_ptr_name, int proc)
3816 gfc_symbol *param_sym = NULL;
3817 gfc_symtree *param_symtree = NULL;
3818 gfc_formal_arglist *formal_arg = NULL;
3819 const char *f_ptr_out = "gfc_fptr__";
3821 if (f_ptr_name != NULL)
3822 f_ptr_out = f_ptr_name;
3824 gfc_get_sym_tree (f_ptr_out, ns, ¶m_symtree, false);
3825 if (param_symtree != NULL)
3826 param_sym = param_symtree->n.sym;
3828 gfc_internal_error ("generateFPtrParam(): Unable to "
3829 "create symbol for %s", f_ptr_out);
3831 /* Set up the necessary fields for the fptr output param sym. */
3834 param_sym->attr.proc_pointer = 1;
3836 param_sym->attr.pointer = 1;
3837 param_sym->attr.dummy = 1;
3838 param_sym->attr.use_assoc = 1;
3840 /* ISO C Binding type to allow any pointer type as actual param. */
3841 param_sym->ts.type = BT_VOID;
3842 param_sym->module = gfc_get_string (module_name);
3845 formal_arg = gfc_get_formal_arglist ();
3846 /* Add arg to list of formal args. */
3847 add_formal_arg (head, tail, formal_arg, param_sym);
3851 /* Generates a symbol representing the optional SHAPE argument for the
3852 iso_c_binding c_f_pointer() procedure. Also, create a
3853 gfc_formal_arglist for the SHAPE and add it to the provided
3857 gen_shape_param (gfc_formal_arglist **head,
3858 gfc_formal_arglist **tail,
3859 const char *module_name,
3860 gfc_namespace *ns, const char *shape_param_name)
3862 gfc_symbol *param_sym = NULL;
3863 gfc_symtree *param_symtree = NULL;
3864 gfc_formal_arglist *formal_arg = NULL;
3865 const char *shape_param = "gfc_shape_array__";
3868 if (shape_param_name != NULL)
3869 shape_param = shape_param_name;
3871 gfc_get_sym_tree (shape_param, ns, ¶m_symtree, false);
3872 if (param_symtree != NULL)
3873 param_sym = param_symtree->n.sym;
3875 gfc_internal_error ("generateShapeParam(): Unable to "
3876 "create symbol for %s", shape_param);
3878 /* Set up the necessary fields for the shape input param sym. */
3880 param_sym->attr.dummy = 1;
3881 param_sym->attr.use_assoc = 1;
3883 /* Integer array, rank 1, describing the shape of the object. Make it's
3884 type BT_VOID initially so we can accept any type/kind combination of
3885 integer. During gfc_iso_c_sub_interface (resolve.c), we'll make it
3886 of BT_INTEGER type. */
3887 param_sym->ts.type = BT_VOID;
3889 /* Initialize the kind to default integer. However, it will be overridden
3890 during resolution to match the kind of the SHAPE parameter given as
3891 the actual argument (to allow for any valid integer kind). */
3892 param_sym->ts.kind = gfc_default_integer_kind;
3893 param_sym->as = gfc_get_array_spec ();
3895 /* Clear out the dimension info for the array. */
3896 for (i = 0; i < GFC_MAX_DIMENSIONS; i++)
3898 param_sym->as->lower[i] = NULL;
3899 param_sym->as->upper[i] = NULL;
3901 param_sym->as->rank = 1;
3902 param_sym->as->lower[0] = gfc_int_expr (1);
3904 /* The extent is unknown until we get it. The length give us
3905 the rank the incoming pointer. */
3906 param_sym->as->type = AS_ASSUMED_SHAPE;
3908 /* The arg is also optional; it is required iff the second arg
3909 (fptr) is to an array, otherwise, it's ignored. */
3910 param_sym->attr.optional = 1;
3911 param_sym->attr.intent = INTENT_IN;
3912 param_sym->attr.dimension = 1;
3913 param_sym->module = gfc_get_string (module_name);
3916 formal_arg = gfc_get_formal_arglist ();
3917 /* Add arg to list of formal args. */
3918 add_formal_arg (head, tail, formal_arg, param_sym);
3922 /* Add a procedure interface to the given symbol (i.e., store a
3923 reference to the list of formal arguments). */
3926 add_proc_interface (gfc_symbol *sym, ifsrc source,
3927 gfc_formal_arglist *formal)
3930 sym->formal = formal;
3931 sym->attr.if_source = source;
3935 /* Copy the formal args from an existing symbol, src, into a new
3936 symbol, dest. New formal args are created, and the description of
3937 each arg is set according to the existing ones. This function is
3938 used when creating procedure declaration variables from a procedure
3939 declaration statement (see match_proc_decl()) to create the formal
3940 args based on the args of a given named interface. */
3943 gfc_copy_formal_args (gfc_symbol *dest, gfc_symbol *src)
3945 gfc_formal_arglist *head = NULL;
3946 gfc_formal_arglist *tail = NULL;
3947 gfc_formal_arglist *formal_arg = NULL;
3948 gfc_formal_arglist *curr_arg = NULL;
3949 gfc_formal_arglist *formal_prev = NULL;
3950 /* Save current namespace so we can change it for formal args. */
3951 gfc_namespace *parent_ns = gfc_current_ns;
3953 /* Create a new namespace, which will be the formal ns (namespace
3954 of the formal args). */
3955 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
3956 gfc_current_ns->proc_name = dest;
3958 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
3960 formal_arg = gfc_get_formal_arglist ();
3961 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
3963 /* May need to copy more info for the symbol. */
3964 formal_arg->sym->attr = curr_arg->sym->attr;
3965 formal_arg->sym->ts = curr_arg->sym->ts;
3966 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
3967 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
3969 /* If this isn't the first arg, set up the next ptr. For the
3970 last arg built, the formal_arg->next will never get set to
3971 anything other than NULL. */
3972 if (formal_prev != NULL)
3973 formal_prev->next = formal_arg;
3975 formal_arg->next = NULL;
3977 formal_prev = formal_arg;
3979 /* Add arg to list of formal args. */
3980 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
3983 /* Add the interface to the symbol. */
3984 add_proc_interface (dest, IFSRC_DECL, head);
3986 /* Store the formal namespace information. */
3987 if (dest->formal != NULL)
3988 /* The current ns should be that for the dest proc. */
3989 dest->formal_ns = gfc_current_ns;
3990 /* Restore the current namespace to what it was on entry. */
3991 gfc_current_ns = parent_ns;
3996 gfc_copy_formal_args_intr (gfc_symbol *dest, gfc_intrinsic_sym *src)
3998 gfc_formal_arglist *head = NULL;
3999 gfc_formal_arglist *tail = NULL;
4000 gfc_formal_arglist *formal_arg = NULL;
4001 gfc_intrinsic_arg *curr_arg = NULL;
4002 gfc_formal_arglist *formal_prev = NULL;
4003 /* Save current namespace so we can change it for formal args. */
4004 gfc_namespace *parent_ns = gfc_current_ns;
4006 /* Create a new namespace, which will be the formal ns (namespace
4007 of the formal args). */
4008 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4009 gfc_current_ns->proc_name = dest;
4011 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4013 formal_arg = gfc_get_formal_arglist ();
4014 gfc_get_symbol (curr_arg->name, gfc_current_ns, &(formal_arg->sym));
4016 /* May need to copy more info for the symbol. */
4017 formal_arg->sym->ts = curr_arg->ts;
4018 formal_arg->sym->attr.optional = curr_arg->optional;
4019 formal_arg->sym->attr.intent = curr_arg->intent;
4020 formal_arg->sym->attr.flavor = FL_VARIABLE;
4021 formal_arg->sym->attr.dummy = 1;
4023 if (formal_arg->sym->ts.type == BT_CHARACTER)
4024 formal_arg->sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4026 /* If this isn't the first arg, set up the next ptr. For the
4027 last arg built, the formal_arg->next will never get set to
4028 anything other than NULL. */
4029 if (formal_prev != NULL)
4030 formal_prev->next = formal_arg;
4032 formal_arg->next = NULL;
4034 formal_prev = formal_arg;
4036 /* Add arg to list of formal args. */
4037 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4040 /* Add the interface to the symbol. */
4041 add_proc_interface (dest, IFSRC_DECL, head);
4043 /* Store the formal namespace information. */
4044 if (dest->formal != NULL)
4045 /* The current ns should be that for the dest proc. */
4046 dest->formal_ns = gfc_current_ns;
4047 /* Restore the current namespace to what it was on entry. */
4048 gfc_current_ns = parent_ns;
4053 gfc_copy_formal_args_ppc (gfc_component *dest, gfc_symbol *src)
4055 gfc_formal_arglist *head = NULL;
4056 gfc_formal_arglist *tail = NULL;
4057 gfc_formal_arglist *formal_arg = NULL;
4058 gfc_formal_arglist *curr_arg = NULL;
4059 gfc_formal_arglist *formal_prev = NULL;
4060 /* Save current namespace so we can change it for formal args. */
4061 gfc_namespace *parent_ns = gfc_current_ns;
4063 /* Create a new namespace, which will be the formal ns (namespace
4064 of the formal args). */
4065 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4066 /* TODO: gfc_current_ns->proc_name = dest;*/
4068 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4070 formal_arg = gfc_get_formal_arglist ();
4071 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4073 /* May need to copy more info for the symbol. */
4074 formal_arg->sym->attr = curr_arg->sym->attr;
4075 formal_arg->sym->ts = curr_arg->sym->ts;
4076 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4077 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
4079 /* If this isn't the first arg, set up the next ptr. For the
4080 last arg built, the formal_arg->next will never get set to
4081 anything other than NULL. */
4082 if (formal_prev != NULL)
4083 formal_prev->next = formal_arg;
4085 formal_arg->next = NULL;
4087 formal_prev = formal_arg;
4089 /* Add arg to list of formal args. */
4090 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4093 /* Add the interface to the symbol. */
4094 dest->formal = head;
4095 dest->attr.if_source = IFSRC_DECL;
4097 /* Store the formal namespace information. */
4098 if (dest->formal != NULL)
4099 /* The current ns should be that for the dest proc. */
4100 dest->formal_ns = gfc_current_ns;
4101 /* Restore the current namespace to what it was on entry. */
4102 gfc_current_ns = parent_ns;
4106 /* Builds the parameter list for the iso_c_binding procedure
4107 c_f_pointer or c_f_procpointer. The old_sym typically refers to a
4108 generic version of either the c_f_pointer or c_f_procpointer
4109 functions. The new_proc_sym represents a "resolved" version of the
4110 symbol. The functions are resolved to match the types of their
4111 parameters; for example, c_f_pointer(cptr, fptr) would resolve to
4112 something similar to c_f_pointer_i4 if the type of data object fptr
4113 pointed to was a default integer. The actual name of the resolved
4114 procedure symbol is further mangled with the module name, etc., but
4115 the idea holds true. */
4118 build_formal_args (gfc_symbol *new_proc_sym,
4119 gfc_symbol *old_sym, int add_optional_arg)
4121 gfc_formal_arglist *head = NULL, *tail = NULL;
4122 gfc_namespace *parent_ns = NULL;
4124 parent_ns = gfc_current_ns;
4125 /* Create a new namespace, which will be the formal ns (namespace
4126 of the formal args). */
4127 gfc_current_ns = gfc_get_namespace(parent_ns, 0);
4128 gfc_current_ns->proc_name = new_proc_sym;
4130 /* Generate the params. */
4131 if (old_sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER)
4133 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4134 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4135 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4136 gfc_current_ns, "fptr", 1);
4138 else if (old_sym->intmod_sym_id == ISOCBINDING_F_POINTER)
4140 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4141 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4142 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4143 gfc_current_ns, "fptr", 0);
4144 /* If we're dealing with c_f_pointer, it has an optional third arg. */
4145 gen_shape_param (&head, &tail,(const char *) new_proc_sym->module,
4146 gfc_current_ns, "shape");
4149 else if (old_sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
4151 /* c_associated has one required arg and one optional; both
4153 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4154 gfc_current_ns, "c_ptr_1", ISOCBINDING_ASSOCIATED);
4155 if (add_optional_arg)
4157 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4158 gfc_current_ns, "c_ptr_2", ISOCBINDING_ASSOCIATED);
4159 /* The last param is optional so mark it as such. */
4160 tail->sym->attr.optional = 1;
4164 /* Add the interface (store formal args to new_proc_sym). */
4165 add_proc_interface (new_proc_sym, IFSRC_DECL, head);
4167 /* Set up the formal_ns pointer to the one created for the
4168 new procedure so it'll get cleaned up during gfc_free_symbol(). */
4169 new_proc_sym->formal_ns = gfc_current_ns;
4171 gfc_current_ns = parent_ns;
4175 std_for_isocbinding_symbol (int id)
4179 #define NAMED_INTCST(a,b,c,d) \
4182 #include "iso-c-binding.def"
4185 return GFC_STD_F2003;
4189 /* Generate the given set of C interoperable kind objects, or all
4190 interoperable kinds. This function will only be given kind objects
4191 for valid iso_c_binding defined types because this is verified when
4192 the 'use' statement is parsed. If the user gives an 'only' clause,
4193 the specific kinds are looked up; if they don't exist, an error is
4194 reported. If the user does not give an 'only' clause, all
4195 iso_c_binding symbols are generated. If a list of specific kinds
4196 is given, it must have a NULL in the first empty spot to mark the
4201 generate_isocbinding_symbol (const char *mod_name, iso_c_binding_symbol s,
4202 const char *local_name)
4204 const char *const name = (local_name && local_name[0]) ? local_name
4205 : c_interop_kinds_table[s].name;
4206 gfc_symtree *tmp_symtree = NULL;
4207 gfc_symbol *tmp_sym = NULL;
4208 gfc_dt_list **dt_list_ptr = NULL;
4209 gfc_component *tmp_comp = NULL;
4210 char comp_name[(GFC_MAX_SYMBOL_LEN * 2) + 1];
4213 if (gfc_notification_std (std_for_isocbinding_symbol (s)) == ERROR)
4215 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, name);
4217 /* Already exists in this scope so don't re-add it.
4218 TODO: we should probably check that it's really the same symbol. */
4219 if (tmp_symtree != NULL)
4222 /* Create the sym tree in the current ns. */
4223 gfc_get_sym_tree (name, gfc_current_ns, &tmp_symtree, false);
4225 tmp_sym = tmp_symtree->n.sym;
4227 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4230 /* Say what module this symbol belongs to. */
4231 tmp_sym->module = gfc_get_string (mod_name);
4232 tmp_sym->from_intmod = INTMOD_ISO_C_BINDING;
4233 tmp_sym->intmod_sym_id = s;
4238 #define NAMED_INTCST(a,b,c,d) case a :
4239 #define NAMED_REALCST(a,b,c) case a :
4240 #define NAMED_CMPXCST(a,b,c) case a :
4241 #define NAMED_LOGCST(a,b,c) case a :
4242 #define NAMED_CHARKNDCST(a,b,c) case a :
4243 #include "iso-c-binding.def"
4245 tmp_sym->value = gfc_int_expr (c_interop_kinds_table[s].value);
4247 /* Initialize an integer constant expression node. */
4248 tmp_sym->attr.flavor = FL_PARAMETER;
4249 tmp_sym->ts.type = BT_INTEGER;
4250 tmp_sym->ts.kind = gfc_default_integer_kind;
4252 /* Mark this type as a C interoperable one. */
4253 tmp_sym->ts.is_c_interop = 1;
4254 tmp_sym->ts.is_iso_c = 1;
4255 tmp_sym->value->ts.is_c_interop = 1;
4256 tmp_sym->value->ts.is_iso_c = 1;
4257 tmp_sym->attr.is_c_interop = 1;
4259 /* Tell what f90 type this c interop kind is valid. */
4260 tmp_sym->ts.f90_type = c_interop_kinds_table[s].f90_type;
4262 /* Say it's from the iso_c_binding module. */
4263 tmp_sym->attr.is_iso_c = 1;
4265 /* Make it use associated. */
4266 tmp_sym->attr.use_assoc = 1;
4270 #define NAMED_CHARCST(a,b,c) case a :
4271 #include "iso-c-binding.def"
4273 /* Initialize an integer constant expression node for the
4274 length of the character. */
4275 tmp_sym->value = gfc_get_expr ();
4276 tmp_sym->value->expr_type = EXPR_CONSTANT;
4277 tmp_sym->value->ts.type = BT_CHARACTER;
4278 tmp_sym->value->ts.kind = gfc_default_character_kind;
4279 tmp_sym->value->where = gfc_current_locus;
4280 tmp_sym->value->ts.is_c_interop = 1;
4281 tmp_sym->value->ts.is_iso_c = 1;
4282 tmp_sym->value->value.character.length = 1;
4283 tmp_sym->value->value.character.string = gfc_get_wide_string (2);
4284 tmp_sym->value->value.character.string[0]
4285 = (gfc_char_t) c_interop_kinds_table[s].value;
4286 tmp_sym->value->value.character.string[1] = '\0';
4287 tmp_sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4288 tmp_sym->ts.u.cl->length = gfc_int_expr (1);
4290 /* May not need this in both attr and ts, but do need in
4291 attr for writing module file. */
4292 tmp_sym->attr.is_c_interop = 1;
4294 tmp_sym->attr.flavor = FL_PARAMETER;
4295 tmp_sym->ts.type = BT_CHARACTER;
4297 /* Need to set it to the C_CHAR kind. */
4298 tmp_sym->ts.kind = gfc_default_character_kind;
4300 /* Mark this type as a C interoperable one. */
4301 tmp_sym->ts.is_c_interop = 1;
4302 tmp_sym->ts.is_iso_c = 1;
4304 /* Tell what f90 type this c interop kind is valid. */
4305 tmp_sym->ts.f90_type = BT_CHARACTER;
4307 /* Say it's from the iso_c_binding module. */
4308 tmp_sym->attr.is_iso_c = 1;
4310 /* Make it use associated. */
4311 tmp_sym->attr.use_assoc = 1;
4314 case ISOCBINDING_PTR:
4315 case ISOCBINDING_FUNPTR:
4317 /* Initialize an integer constant expression node. */
4318 tmp_sym->attr.flavor = FL_DERIVED;
4319 tmp_sym->ts.is_c_interop = 1;
4320 tmp_sym->attr.is_c_interop = 1;
4321 tmp_sym->attr.is_iso_c = 1;
4322 tmp_sym->ts.is_iso_c = 1;
4323 tmp_sym->ts.type = BT_DERIVED;
4325 /* A derived type must have the bind attribute to be
4326 interoperable (J3/04-007, Section 15.2.3), even though
4327 the binding label is not used. */
4328 tmp_sym->attr.is_bind_c = 1;
4330 tmp_sym->attr.referenced = 1;
4332 tmp_sym->ts.u.derived = tmp_sym;
4334 /* Add the symbol created for the derived type to the current ns. */
4335 dt_list_ptr = &(gfc_derived_types);
4336 while (*dt_list_ptr != NULL && (*dt_list_ptr)->next != NULL)
4337 dt_list_ptr = &((*dt_list_ptr)->next);
4339 /* There is already at least one derived type in the list, so append
4340 the one we're currently building for c_ptr or c_funptr. */
4341 if (*dt_list_ptr != NULL)
4342 dt_list_ptr = &((*dt_list_ptr)->next);
4343 (*dt_list_ptr) = gfc_get_dt_list ();
4344 (*dt_list_ptr)->derived = tmp_sym;
4345 (*dt_list_ptr)->next = NULL;
4347 /* Set up the component of the derived type, which will be
4348 an integer with kind equal to c_ptr_size. Mangle the name of
4349 the field for the c_address to prevent the curious user from
4350 trying to access it from Fortran. */
4351 sprintf (comp_name, "__%s_%s", tmp_sym->name, "c_address");
4352 gfc_add_component (tmp_sym, comp_name, &tmp_comp);
4353 if (tmp_comp == NULL)
4354 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4355 "create component for c_address");
4357 tmp_comp->ts.type = BT_INTEGER;
4359 /* Set this because the module will need to read/write this field. */
4360 tmp_comp->ts.f90_type = BT_INTEGER;
4362 /* The kinds for c_ptr and c_funptr are the same. */
4363 index = get_c_kind ("c_ptr", c_interop_kinds_table);
4364 tmp_comp->ts.kind = c_interop_kinds_table[index].value;
4366 tmp_comp->attr.pointer = 0;
4367 tmp_comp->attr.dimension = 0;
4369 /* Mark the component as C interoperable. */
4370 tmp_comp->ts.is_c_interop = 1;
4372 /* Make it use associated (iso_c_binding module). */
4373 tmp_sym->attr.use_assoc = 1;
4376 case ISOCBINDING_NULL_PTR:
4377 case ISOCBINDING_NULL_FUNPTR:
4378 gen_special_c_interop_ptr (s, name, mod_name);
4381 case ISOCBINDING_F_POINTER:
4382 case ISOCBINDING_ASSOCIATED:
4383 case ISOCBINDING_LOC:
4384 case ISOCBINDING_FUNLOC:
4385 case ISOCBINDING_F_PROCPOINTER:
4387 tmp_sym->attr.proc = PROC_MODULE;
4389 /* Use the procedure's name as it is in the iso_c_binding module for
4390 setting the binding label in case the user renamed the symbol. */
4391 sprintf (tmp_sym->binding_label, "%s_%s", mod_name,
4392 c_interop_kinds_table[s].name);
4393 tmp_sym->attr.is_iso_c = 1;
4394 if (s == ISOCBINDING_F_POINTER || s == ISOCBINDING_F_PROCPOINTER)
4395 tmp_sym->attr.subroutine = 1;
4398 /* TODO! This needs to be finished more for the expr of the
4399 function or something!
4400 This may not need to be here, because trying to do c_loc
4402 if (s == ISOCBINDING_ASSOCIATED)
4404 tmp_sym->attr.function = 1;
4405 tmp_sym->ts.type = BT_LOGICAL;
4406 tmp_sym->ts.kind = gfc_default_logical_kind;
4407 tmp_sym->result = tmp_sym;
4411 /* Here, we're taking the simple approach. We're defining
4412 c_loc as an external identifier so the compiler will put
4413 what we expect on the stack for the address we want the
4415 tmp_sym->ts.type = BT_DERIVED;
4416 if (s == ISOCBINDING_LOC)
4417 tmp_sym->ts.u.derived =
4418 get_iso_c_binding_dt (ISOCBINDING_PTR);
4420 tmp_sym->ts.u.derived =
4421 get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
4423 if (tmp_sym->ts.u.derived == NULL)
4425 /* Create the necessary derived type so we can continue
4426 processing the file. */
4427 generate_isocbinding_symbol
4428 (mod_name, s == ISOCBINDING_FUNLOC
4429 ? ISOCBINDING_FUNPTR : ISOCBINDING_PTR,
4430 (const char *)(s == ISOCBINDING_FUNLOC
4431 ? "_gfortran_iso_c_binding_c_funptr"
4432 : "_gfortran_iso_c_binding_c_ptr"));
4433 tmp_sym->ts.u.derived =
4434 get_iso_c_binding_dt (s == ISOCBINDING_FUNLOC
4435 ? ISOCBINDING_FUNPTR
4439 /* The function result is itself (no result clause). */
4440 tmp_sym->result = tmp_sym;
4441 tmp_sym->attr.external = 1;
4442 tmp_sym->attr.use_assoc = 0;
4443 tmp_sym->attr.pure = 1;
4444 tmp_sym->attr.if_source = IFSRC_UNKNOWN;
4445 tmp_sym->attr.proc = PROC_UNKNOWN;
4449 tmp_sym->attr.flavor = FL_PROCEDURE;
4450 tmp_sym->attr.contained = 0;
4452 /* Try using this builder routine, with the new and old symbols
4453 both being the generic iso_c proc sym being created. This
4454 will create the formal args (and the new namespace for them).
4455 Don't build an arg list for c_loc because we're going to treat
4456 c_loc as an external procedure. */
4457 if (s != ISOCBINDING_LOC && s != ISOCBINDING_FUNLOC)
4458 /* The 1 says to add any optional args, if applicable. */
4459 build_formal_args (tmp_sym, tmp_sym, 1);
4461 /* Set this after setting up the symbol, to prevent error messages. */
4462 tmp_sym->attr.use_assoc = 1;
4464 /* This symbol will not be referenced directly. It will be
4465 resolved to the implementation for the given f90 kind. */
4466 tmp_sym->attr.referenced = 0;
4476 /* Creates a new symbol based off of an old iso_c symbol, with a new
4477 binding label. This function can be used to create a new,
4478 resolved, version of a procedure symbol for c_f_pointer or
4479 c_f_procpointer that is based on the generic symbols. A new
4480 parameter list is created for the new symbol using
4481 build_formal_args(). The add_optional_flag specifies whether the
4482 to add the optional SHAPE argument. The new symbol is
4486 get_iso_c_sym (gfc_symbol *old_sym, char *new_name,
4487 char *new_binding_label, int add_optional_arg)
4489 gfc_symtree *new_symtree = NULL;
4491 /* See if we have a symbol by that name already available, looking
4492 through any parent namespaces. */
4493 gfc_find_sym_tree (new_name, gfc_current_ns, 1, &new_symtree);
4494 if (new_symtree != NULL)
4495 /* Return the existing symbol. */
4496 return new_symtree->n.sym;
4498 /* Create the symtree/symbol, with attempted host association. */
4499 gfc_get_ha_sym_tree (new_name, &new_symtree);
4500 if (new_symtree == NULL)
4501 gfc_internal_error ("get_iso_c_sym(): Unable to create "
4502 "symtree for '%s'", new_name);
4504 /* Now fill in the fields of the resolved symbol with the old sym. */
4505 strcpy (new_symtree->n.sym->binding_label, new_binding_label);
4506 new_symtree->n.sym->attr = old_sym->attr;
4507 new_symtree->n.sym->ts = old_sym->ts;
4508 new_symtree->n.sym->module = gfc_get_string (old_sym->module);
4509 new_symtree->n.sym->from_intmod = old_sym->from_intmod;
4510 new_symtree->n.sym->intmod_sym_id = old_sym->intmod_sym_id;
4511 /* Build the formal arg list. */
4512 build_formal_args (new_symtree->n.sym, old_sym, add_optional_arg);
4514 gfc_commit_symbol (new_symtree->n.sym);
4516 return new_symtree->n.sym;
4520 /* Check that a symbol is already typed. If strict is not set, an untyped
4521 symbol is acceptable for non-standard-conforming mode. */
4524 gfc_check_symbol_typed (gfc_symbol* sym, gfc_namespace* ns,
4525 bool strict, locus where)
4529 if (gfc_matching_prefix)
4532 /* Check for the type and try to give it an implicit one. */
4533 if (sym->ts.type == BT_UNKNOWN
4534 && gfc_set_default_type (sym, 0, ns) == FAILURE)
4538 gfc_error ("Symbol '%s' is used before it is typed at %L",
4543 if (gfc_notify_std (GFC_STD_GNU,
4544 "Extension: Symbol '%s' is used before"
4545 " it is typed at %L", sym->name, &where) == FAILURE)
4549 /* Everything is ok. */
4554 /* Construct a typebound-procedure structure. Those are stored in a tentative
4555 list and marked `error' until symbols are committed. */
4558 gfc_get_typebound_proc (void)
4560 gfc_typebound_proc *result;
4561 tentative_tbp *list_node;
4563 result = XCNEW (gfc_typebound_proc);
4566 list_node = XCNEW (tentative_tbp);
4567 list_node->next = tentative_tbp_list;
4568 list_node->proc = result;
4569 tentative_tbp_list = list_node;
4575 /* Get the super-type of a given derived type. */
4578 gfc_get_derived_super_type (gfc_symbol* derived)
4580 if (!derived->attr.extension)
4583 gcc_assert (derived->components);
4584 gcc_assert (derived->components->ts.type == BT_DERIVED);
4585 gcc_assert (derived->components->ts.u.derived);
4587 return derived->components->ts.u.derived;
4591 /* Get the ultimate super-type of a given derived type. */
4594 gfc_get_ultimate_derived_super_type (gfc_symbol* derived)
4596 if (!derived->attr.extension)
4599 derived = gfc_get_derived_super_type (derived);
4601 if (derived->attr.extension)
4602 return gfc_get_ultimate_derived_super_type (derived);
4608 /* Check if a derived type t2 is an extension of (or equal to) a type t1. */
4611 gfc_type_is_extension_of (gfc_symbol *t1, gfc_symbol *t2)
4613 while (!gfc_compare_derived_types (t1, t2) && t2->attr.extension)
4614 t2 = gfc_get_derived_super_type (t2);
4615 return gfc_compare_derived_types (t1, t2);
4619 /* Check if two typespecs are type compatible (F03:5.1.1.2):
4620 If ts1 is nonpolymorphic, ts2 must be the same type.
4621 If ts1 is polymorphic (CLASS), ts2 must be an extension of ts1. */
4624 gfc_type_compatible (gfc_typespec *ts1, gfc_typespec *ts2)
4626 gfc_component *cmp1, *cmp2;
4628 bool is_class1 = (ts1->type == BT_CLASS);
4629 bool is_class2 = (ts2->type == BT_CLASS);
4630 bool is_derived1 = (ts1->type == BT_DERIVED);
4631 bool is_derived2 = (ts2->type == BT_DERIVED);
4633 if (!is_derived1 && !is_derived2 && !is_class1 && !is_class2)
4634 return (ts1->type == ts2->type);
4636 if (is_derived1 && is_derived2)
4637 return gfc_compare_derived_types (ts1->u.derived, ts2->u.derived);
4643 cmp1 = gfc_find_component (ts1->u.derived, "$data", true, false);
4650 cmp2 = gfc_find_component (ts2->u.derived, "$data", true, false);
4655 if (is_class1 && is_derived2)
4656 return gfc_type_is_extension_of (cmp1->ts.u.derived, ts2->u.derived);
4658 else if (is_class1 && is_class2)
4659 return gfc_type_is_extension_of (cmp1->ts.u.derived, cmp2->ts.u.derived);
4666 /* Build a polymorphic CLASS entity, using the symbol that comes from
4667 build_sym. A CLASS entity is represented by an encapsulating type,
4668 which contains the declared type as '$data' component, plus a pointer
4669 component '$vptr' which determines the dynamic type. */
4672 gfc_build_class_symbol (gfc_typespec *ts, symbol_attribute *attr,
4673 gfc_array_spec **as)
4675 char name[GFC_MAX_SYMBOL_LEN + 5];
4680 /* Determine the name of the encapsulating type. */
4681 if ((*as) && (*as)->rank && attr->allocatable)
4682 sprintf (name, ".class.%s.%d.a", ts->u.derived->name, (*as)->rank);
4683 else if ((*as) && (*as)->rank)
4684 sprintf (name, ".class.%s.%d", ts->u.derived->name, (*as)->rank);
4685 else if (attr->allocatable)
4686 sprintf (name, ".class.%s.a", ts->u.derived->name);
4688 sprintf (name, ".class.%s", ts->u.derived->name);
4690 gfc_find_symbol (name, ts->u.derived->ns, 0, &fclass);
4694 /* If not there, create a new symbol. */
4695 fclass = gfc_new_symbol (name, ts->u.derived->ns);
4696 st = gfc_new_symtree (&ts->u.derived->ns->sym_root, name);
4698 gfc_set_sym_referenced (fclass);
4700 fclass->ts.type = BT_UNKNOWN;
4701 fclass->attr.abstract = ts->u.derived->attr.abstract;
4702 if (ts->u.derived->f2k_derived)
4703 fclass->f2k_derived = gfc_get_namespace (NULL, 0);
4704 if (gfc_add_flavor (&fclass->attr, FL_DERIVED,
4705 NULL, &gfc_current_locus) == FAILURE)
4708 /* Add component '$data'. */
4709 if (gfc_add_component (fclass, "$data", &c) == FAILURE)
4712 c->ts.type = BT_DERIVED;
4713 c->attr.access = ACCESS_PRIVATE;
4714 c->ts.u.derived = ts->u.derived;
4715 c->attr.class_pointer = attr->pointer;
4716 c->attr.pointer = attr->pointer || attr->dummy;
4717 c->attr.allocatable = attr->allocatable;
4718 c->attr.dimension = attr->dimension;
4719 c->attr.abstract = ts->u.derived->attr.abstract;
4721 c->initializer = gfc_get_expr ();
4722 c->initializer->expr_type = EXPR_NULL;
4724 /* Add component '$vptr'. */
4725 if (gfc_add_component (fclass, "$vptr", &c) == FAILURE)
4727 c->ts.type = BT_DERIVED;
4728 vtab = gfc_find_derived_vtab (ts->u.derived);
4730 c->ts.u.derived = vtab->ts.u.derived;
4731 c->attr.pointer = 1;
4732 c->initializer = gfc_get_expr ();
4733 c->initializer->expr_type = EXPR_NULL;
4736 /* Since the extension field is 8 bit wide, we can only have
4737 up to 255 extension levels. */
4738 if (ts->u.derived->attr.extension == 255)
4740 gfc_error ("Maximum extension level reached with type '%s' at %L",
4741 ts->u.derived->name, &ts->u.derived->declared_at);
4745 fclass->attr.extension = ts->u.derived->attr.extension + 1;
4746 fclass->attr.is_class = 1;
4747 ts->u.derived = fclass;
4748 attr->allocatable = attr->pointer = attr->dimension = 0;
4749 (*as) = NULL; /* XXX */
4754 /* Find the symbol for a derived type's vtab. */
4757 gfc_find_derived_vtab (gfc_symbol *derived)
4760 gfc_symbol *vtab = NULL, *vtype = NULL;
4761 char name[2 * GFC_MAX_SYMBOL_LEN + 8];
4763 ns = gfc_current_ns;
4765 for (; ns; ns = ns->parent)
4771 sprintf (name, "vtab$%s", derived->name);
4772 gfc_find_symbol (name, ns, 0, &vtab);
4776 gfc_get_symbol (name, ns, &vtab);
4777 vtab->ts.type = BT_DERIVED;
4778 vtab->attr.flavor = FL_VARIABLE;
4779 vtab->attr.target = 1;
4780 vtab->attr.save = SAVE_EXPLICIT;
4781 vtab->attr.vtab = 1;
4782 vtab->attr.access = ACCESS_PRIVATE;
4784 gfc_set_sym_referenced (vtab);
4785 sprintf (name, "vtype$%s", derived->name);
4787 gfc_find_symbol (name, ns, 0, &vtype);
4791 gfc_symbol *parent = NULL, *parent_vtab = NULL;
4793 gfc_get_symbol (name, ns, &vtype);
4794 if (gfc_add_flavor (&vtype->attr, FL_DERIVED,
4795 NULL, &gfc_current_locus) == FAILURE)
4798 gfc_set_sym_referenced (vtype);
4799 vtype->attr.access = ACCESS_PRIVATE;
4801 /* Add component '$hash'. */
4802 if (gfc_add_component (vtype, "$hash", &c) == FAILURE)
4804 c->ts.type = BT_INTEGER;
4806 c->attr.access = ACCESS_PRIVATE;
4807 c->initializer = gfc_int_expr (derived->hash_value);
4809 /* Add component '$size'. */
4810 if (gfc_add_component (vtype, "$size", &c) == FAILURE)
4812 c->ts.type = BT_INTEGER;
4814 c->attr.access = ACCESS_PRIVATE;
4815 /* Remember the derived type in ts.u.derived,
4816 so that the correct initializer can be set later on
4817 (in gfc_conv_structure). */
4818 c->ts.u.derived = derived;
4819 c->initializer = gfc_int_expr (0);
4821 /* Add component $extends. */
4822 if (gfc_add_component (vtype, "$extends", &c) == FAILURE)
4824 c->attr.pointer = 1;
4825 c->attr.access = ACCESS_PRIVATE;
4826 c->initializer = gfc_get_expr ();
4827 parent = gfc_get_derived_super_type (derived);
4830 parent_vtab = gfc_find_derived_vtab (parent);
4831 c->ts.type = BT_DERIVED;
4832 c->ts.u.derived = parent_vtab->ts.u.derived;
4833 c->initializer->expr_type = EXPR_VARIABLE;
4834 gfc_find_sym_tree (parent_vtab->name, parent_vtab->ns, 0,
4835 &c->initializer->symtree);
4839 c->ts.type = BT_DERIVED;
4840 c->ts.u.derived = vtype;
4841 c->initializer->expr_type = EXPR_NULL;
4844 vtab->ts.u.derived = vtype;
4846 vtab->value = gfc_default_initializer (&vtab->ts);
4854 /* General worker function to find either a type-bound procedure or a
4855 type-bound user operator. */
4858 find_typebound_proc_uop (gfc_symbol* derived, gfc_try* t,
4859 const char* name, bool noaccess, bool uop,
4865 /* Set correct symbol-root. */
4866 gcc_assert (derived->f2k_derived);
4867 root = (uop ? derived->f2k_derived->tb_uop_root
4868 : derived->f2k_derived->tb_sym_root);
4870 /* Set default to failure. */
4874 /* Try to find it in the current type's namespace. */
4875 res = gfc_find_symtree (root, name);
4876 if (res && res->n.tb && !res->n.tb->error)
4882 if (!noaccess && derived->attr.use_assoc
4883 && res->n.tb->access == ACCESS_PRIVATE)
4886 gfc_error ("'%s' of '%s' is PRIVATE at %L",
4887 name, derived->name, where);
4895 /* Otherwise, recurse on parent type if derived is an extension. */
4896 if (derived->attr.extension)
4898 gfc_symbol* super_type;
4899 super_type = gfc_get_derived_super_type (derived);
4900 gcc_assert (super_type);
4902 return find_typebound_proc_uop (super_type, t, name,
4903 noaccess, uop, where);
4906 /* Nothing found. */
4911 /* Find a type-bound procedure or user operator by name for a derived-type
4912 (looking recursively through the super-types). */
4915 gfc_find_typebound_proc (gfc_symbol* derived, gfc_try* t,
4916 const char* name, bool noaccess, locus* where)
4918 return find_typebound_proc_uop (derived, t, name, noaccess, false, where);
4922 gfc_find_typebound_user_op (gfc_symbol* derived, gfc_try* t,
4923 const char* name, bool noaccess, locus* where)
4925 return find_typebound_proc_uop (derived, t, name, noaccess, true, where);
4929 /* Find a type-bound intrinsic operator looking recursively through the
4930 super-type hierarchy. */
4933 gfc_find_typebound_intrinsic_op (gfc_symbol* derived, gfc_try* t,
4934 gfc_intrinsic_op op, bool noaccess,
4937 gfc_typebound_proc* res;
4939 /* Set default to failure. */
4943 /* Try to find it in the current type's namespace. */
4944 if (derived->f2k_derived)
4945 res = derived->f2k_derived->tb_op[op];
4950 if (res && !res->error)
4956 if (!noaccess && derived->attr.use_assoc
4957 && res->access == ACCESS_PRIVATE)
4960 gfc_error ("'%s' of '%s' is PRIVATE at %L",
4961 gfc_op2string (op), derived->name, where);
4969 /* Otherwise, recurse on parent type if derived is an extension. */
4970 if (derived->attr.extension)
4972 gfc_symbol* super_type;
4973 super_type = gfc_get_derived_super_type (derived);
4974 gcc_assert (super_type);
4976 return gfc_find_typebound_intrinsic_op (super_type, t, op,
4980 /* Nothing found. */
4985 /* Get a typebound-procedure symtree or create and insert it if not yet
4986 present. This is like a very simplified version of gfc_get_sym_tree for
4987 tbp-symtrees rather than regular ones. */
4990 gfc_get_tbp_symtree (gfc_symtree **root, const char *name)
4992 gfc_symtree *result;
4994 result = gfc_find_symtree (*root, name);
4997 result = gfc_new_symtree (root, name);
4998 gcc_assert (result);
4999 result->n.tb = NULL;