1 /* Maintain binary trees of symbols.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
26 #include "coretypes.h"
31 #include "constructor.h"
34 /* Strings for all symbol attributes. We use these for dumping the
35 parse tree, in error messages, and also when reading and writing
38 const mstring flavors[] =
40 minit ("UNKNOWN-FL", FL_UNKNOWN), minit ("PROGRAM", FL_PROGRAM),
41 minit ("BLOCK-DATA", FL_BLOCK_DATA), minit ("MODULE", FL_MODULE),
42 minit ("VARIABLE", FL_VARIABLE), minit ("PARAMETER", FL_PARAMETER),
43 minit ("LABEL", FL_LABEL), minit ("PROCEDURE", FL_PROCEDURE),
44 minit ("DERIVED", FL_DERIVED), minit ("NAMELIST", FL_NAMELIST),
48 const mstring procedures[] =
50 minit ("UNKNOWN-PROC", PROC_UNKNOWN),
51 minit ("MODULE-PROC", PROC_MODULE),
52 minit ("INTERNAL-PROC", PROC_INTERNAL),
53 minit ("DUMMY-PROC", PROC_DUMMY),
54 minit ("INTRINSIC-PROC", PROC_INTRINSIC),
55 minit ("EXTERNAL-PROC", PROC_EXTERNAL),
56 minit ("STATEMENT-PROC", PROC_ST_FUNCTION),
60 const mstring intents[] =
62 minit ("UNKNOWN-INTENT", INTENT_UNKNOWN),
63 minit ("IN", INTENT_IN),
64 minit ("OUT", INTENT_OUT),
65 minit ("INOUT", INTENT_INOUT),
69 const mstring access_types[] =
71 minit ("UNKNOWN-ACCESS", ACCESS_UNKNOWN),
72 minit ("PUBLIC", ACCESS_PUBLIC),
73 minit ("PRIVATE", ACCESS_PRIVATE),
77 const mstring ifsrc_types[] =
79 minit ("UNKNOWN", IFSRC_UNKNOWN),
80 minit ("DECL", IFSRC_DECL),
81 minit ("BODY", IFSRC_IFBODY)
84 const mstring save_status[] =
86 minit ("UNKNOWN", SAVE_NONE),
87 minit ("EXPLICIT-SAVE", SAVE_EXPLICIT),
88 minit ("IMPLICIT-SAVE", SAVE_IMPLICIT),
91 /* This is to make sure the backend generates setup code in the correct
94 static int next_dummy_order = 1;
97 gfc_namespace *gfc_current_ns;
98 gfc_namespace *gfc_global_ns_list;
100 gfc_gsymbol *gfc_gsym_root = NULL;
102 static gfc_symbol *changed_syms = NULL;
104 gfc_dt_list *gfc_derived_types;
107 /* List of tentative typebound-procedures. */
109 typedef struct tentative_tbp
111 gfc_typebound_proc *proc;
112 struct tentative_tbp *next;
116 static tentative_tbp *tentative_tbp_list = NULL;
119 /*********** IMPLICIT NONE and IMPLICIT statement handlers ***********/
121 /* The following static variable indicates whether a particular element has
122 been explicitly set or not. */
124 static int new_flag[GFC_LETTERS];
127 /* Handle a correctly parsed IMPLICIT NONE. */
130 gfc_set_implicit_none (void)
134 if (gfc_current_ns->seen_implicit_none)
136 gfc_error ("Duplicate IMPLICIT NONE statement at %C");
140 gfc_current_ns->seen_implicit_none = 1;
142 for (i = 0; i < GFC_LETTERS; i++)
144 gfc_clear_ts (&gfc_current_ns->default_type[i]);
145 gfc_current_ns->set_flag[i] = 1;
150 /* Reset the implicit range flags. */
153 gfc_clear_new_implicit (void)
157 for (i = 0; i < GFC_LETTERS; i++)
162 /* Prepare for a new implicit range. Sets flags in new_flag[]. */
165 gfc_add_new_implicit_range (int c1, int c2)
172 for (i = c1; i <= c2; i++)
176 gfc_error ("Letter '%c' already set in IMPLICIT statement at %C",
188 /* Add a matched implicit range for gfc_set_implicit(). Check if merging
189 the new implicit types back into the existing types will work. */
192 gfc_merge_new_implicit (gfc_typespec *ts)
196 if (gfc_current_ns->seen_implicit_none)
198 gfc_error ("Cannot specify IMPLICIT at %C after IMPLICIT NONE");
202 for (i = 0; i < GFC_LETTERS; i++)
206 if (gfc_current_ns->set_flag[i])
208 gfc_error ("Letter %c already has an IMPLICIT type at %C",
213 gfc_current_ns->default_type[i] = *ts;
214 gfc_current_ns->implicit_loc[i] = gfc_current_locus;
215 gfc_current_ns->set_flag[i] = 1;
222 /* Given a symbol, return a pointer to the typespec for its default type. */
225 gfc_get_default_type (const char *name, gfc_namespace *ns)
231 if (gfc_option.flag_allow_leading_underscore && letter == '_')
232 gfc_internal_error ("Option -fallow-leading-underscore is for use only by "
233 "gfortran developers, and should not be used for "
234 "implicitly typed variables");
236 if (letter < 'a' || letter > 'z')
237 gfc_internal_error ("gfc_get_default_type(): Bad symbol '%s'", name);
242 return &ns->default_type[letter - 'a'];
246 /* Given a pointer to a symbol, set its type according to the first
247 letter of its name. Fails if the letter in question has no default
251 gfc_set_default_type (gfc_symbol *sym, int error_flag, gfc_namespace *ns)
255 if (sym->ts.type != BT_UNKNOWN)
256 gfc_internal_error ("gfc_set_default_type(): symbol already has a type");
258 ts = gfc_get_default_type (sym->name, ns);
260 if (ts->type == BT_UNKNOWN)
262 if (error_flag && !sym->attr.untyped)
264 gfc_error ("Symbol '%s' at %L has no IMPLICIT type",
265 sym->name, &sym->declared_at);
266 sym->attr.untyped = 1; /* Ensure we only give an error once. */
273 sym->attr.implicit_type = 1;
275 if (ts->type == BT_CHARACTER && ts->u.cl)
276 sym->ts.u.cl = gfc_new_charlen (sym->ns, ts->u.cl);
278 if (sym->attr.is_bind_c == 1 && gfc_option.warn_c_binding_type)
280 /* BIND(C) variables should not be implicitly declared. */
281 gfc_warning_now ("Implicitly declared BIND(C) variable '%s' at %L may "
282 "not be C interoperable", sym->name, &sym->declared_at);
283 sym->ts.f90_type = sym->ts.type;
286 if (sym->attr.dummy != 0)
288 if (sym->ns->proc_name != NULL
289 && (sym->ns->proc_name->attr.subroutine != 0
290 || sym->ns->proc_name->attr.function != 0)
291 && sym->ns->proc_name->attr.is_bind_c != 0
292 && gfc_option.warn_c_binding_type)
294 /* Dummy args to a BIND(C) routine may not be interoperable if
295 they are implicitly typed. */
296 gfc_warning_now ("Implicitly declared variable '%s' at %L may not "
297 "be C interoperable but it is a dummy argument to "
298 "the BIND(C) procedure '%s' at %L", sym->name,
299 &(sym->declared_at), sym->ns->proc_name->name,
300 &(sym->ns->proc_name->declared_at));
301 sym->ts.f90_type = sym->ts.type;
309 /* This function is called from parse.c(parse_progunit) to check the
310 type of the function is not implicitly typed in the host namespace
311 and to implicitly type the function result, if necessary. */
314 gfc_check_function_type (gfc_namespace *ns)
316 gfc_symbol *proc = ns->proc_name;
318 if (!proc->attr.contained || proc->result->attr.implicit_type)
321 if (proc->result->ts.type == BT_UNKNOWN && proc->result->ts.interface == NULL)
323 if (gfc_set_default_type (proc->result, 0, gfc_current_ns)
326 if (proc->result != proc)
328 proc->ts = proc->result->ts;
329 proc->as = gfc_copy_array_spec (proc->result->as);
330 proc->attr.dimension = proc->result->attr.dimension;
331 proc->attr.pointer = proc->result->attr.pointer;
332 proc->attr.allocatable = proc->result->attr.allocatable;
335 else if (!proc->result->attr.proc_pointer)
337 gfc_error ("Function result '%s' at %L has no IMPLICIT type",
338 proc->result->name, &proc->result->declared_at);
339 proc->result->attr.untyped = 1;
345 /******************** Symbol attribute stuff *********************/
347 /* This is a generic conflict-checker. We do this to avoid having a
348 single conflict in two places. */
350 #define conf(a, b) if (attr->a && attr->b) { a1 = a; a2 = b; goto conflict; }
351 #define conf2(a) if (attr->a) { a2 = a; goto conflict; }
352 #define conf_std(a, b, std) if (attr->a && attr->b)\
361 check_conflict (symbol_attribute *attr, const char *name, locus *where)
363 static const char *dummy = "DUMMY", *save = "SAVE", *pointer = "POINTER",
364 *target = "TARGET", *external = "EXTERNAL", *intent = "INTENT",
365 *intent_in = "INTENT(IN)", *intrinsic = "INTRINSIC",
366 *intent_out = "INTENT(OUT)", *intent_inout = "INTENT(INOUT)",
367 *allocatable = "ALLOCATABLE", *elemental = "ELEMENTAL",
368 *privat = "PRIVATE", *recursive = "RECURSIVE",
369 *in_common = "COMMON", *result = "RESULT", *in_namelist = "NAMELIST",
370 *publik = "PUBLIC", *optional = "OPTIONAL", *entry = "ENTRY",
371 *function = "FUNCTION", *subroutine = "SUBROUTINE",
372 *dimension = "DIMENSION", *in_equivalence = "EQUIVALENCE",
373 *use_assoc = "USE ASSOCIATED", *cray_pointer = "CRAY POINTER",
374 *cray_pointee = "CRAY POINTEE", *data = "DATA", *value = "VALUE",
375 *volatile_ = "VOLATILE", *is_protected = "PROTECTED",
376 *is_bind_c = "BIND(C)", *procedure = "PROCEDURE",
377 *asynchronous = "ASYNCHRONOUS", *codimension = "CODIMENSION",
378 *contiguous = "CONTIGUOUS", *generic = "GENERIC";
379 static const char *threadprivate = "THREADPRIVATE";
385 where = &gfc_current_locus;
387 if (attr->pointer && attr->intent != INTENT_UNKNOWN)
391 standard = GFC_STD_F2003;
395 if (attr->in_namelist && (attr->allocatable || attr->pointer))
398 a2 = attr->allocatable ? allocatable : pointer;
399 standard = GFC_STD_F2003;
403 /* Check for attributes not allowed in a BLOCK DATA. */
404 if (gfc_current_state () == COMP_BLOCK_DATA)
408 if (attr->in_namelist)
410 if (attr->allocatable)
416 if (attr->access == ACCESS_PRIVATE)
418 if (attr->access == ACCESS_PUBLIC)
420 if (attr->intent != INTENT_UNKNOWN)
426 ("%s attribute not allowed in BLOCK DATA program unit at %L",
432 if (attr->save == SAVE_EXPLICIT)
435 conf (in_common, save);
438 switch (attr->flavor)
446 a1 = gfc_code2string (flavors, attr->flavor);
450 gfc_error ("Namelist group name at %L cannot have the "
451 "SAVE attribute", where);
455 /* Conflicts between SAVE and PROCEDURE will be checked at
456 resolution stage, see "resolve_fl_procedure". */
464 conf (dummy, intrinsic);
465 conf (dummy, threadprivate);
466 conf (pointer, target);
467 conf (pointer, intrinsic);
468 conf (pointer, elemental);
469 conf (allocatable, elemental);
471 conf (target, external);
472 conf (target, intrinsic);
474 if (!attr->if_source)
475 conf (external, dimension); /* See Fortran 95's R504. */
477 conf (external, intrinsic);
478 conf (entry, intrinsic);
480 if ((attr->if_source == IFSRC_DECL && !attr->procedure) || attr->contained)
481 conf (external, subroutine);
483 if (attr->proc_pointer && gfc_notify_std (GFC_STD_F2003,
484 "Procedure pointer at %C") == FAILURE)
487 conf (allocatable, pointer);
488 conf_std (allocatable, dummy, GFC_STD_F2003);
489 conf_std (allocatable, function, GFC_STD_F2003);
490 conf_std (allocatable, result, GFC_STD_F2003);
491 conf (elemental, recursive);
493 conf (in_common, dummy);
494 conf (in_common, allocatable);
495 conf (in_common, codimension);
496 conf (in_common, result);
498 conf (in_equivalence, use_assoc);
499 conf (in_equivalence, codimension);
500 conf (in_equivalence, dummy);
501 conf (in_equivalence, target);
502 conf (in_equivalence, pointer);
503 conf (in_equivalence, function);
504 conf (in_equivalence, result);
505 conf (in_equivalence, entry);
506 conf (in_equivalence, allocatable);
507 conf (in_equivalence, threadprivate);
509 conf (dummy, result);
510 conf (entry, result);
511 conf (generic, result);
513 conf (function, subroutine);
515 if (!function && !subroutine)
516 conf (is_bind_c, dummy);
518 conf (is_bind_c, cray_pointer);
519 conf (is_bind_c, cray_pointee);
520 conf (is_bind_c, codimension);
521 conf (is_bind_c, allocatable);
522 conf (is_bind_c, elemental);
524 /* Need to also get volatile attr, according to 5.1 of F2003 draft.
525 Parameter conflict caught below. Also, value cannot be specified
526 for a dummy procedure. */
528 /* Cray pointer/pointee conflicts. */
529 conf (cray_pointer, cray_pointee);
530 conf (cray_pointer, dimension);
531 conf (cray_pointer, codimension);
532 conf (cray_pointer, contiguous);
533 conf (cray_pointer, pointer);
534 conf (cray_pointer, target);
535 conf (cray_pointer, allocatable);
536 conf (cray_pointer, external);
537 conf (cray_pointer, intrinsic);
538 conf (cray_pointer, in_namelist);
539 conf (cray_pointer, function);
540 conf (cray_pointer, subroutine);
541 conf (cray_pointer, entry);
543 conf (cray_pointee, allocatable);
544 conf (cray_pointer, contiguous);
545 conf (cray_pointer, codimension);
546 conf (cray_pointee, intent);
547 conf (cray_pointee, optional);
548 conf (cray_pointee, dummy);
549 conf (cray_pointee, target);
550 conf (cray_pointee, intrinsic);
551 conf (cray_pointee, pointer);
552 conf (cray_pointee, entry);
553 conf (cray_pointee, in_common);
554 conf (cray_pointee, in_equivalence);
555 conf (cray_pointee, threadprivate);
558 conf (data, function);
560 conf (data, allocatable);
562 conf (value, pointer)
563 conf (value, allocatable)
564 conf (value, subroutine)
565 conf (value, function)
566 conf (value, volatile_)
567 conf (value, dimension)
568 conf (value, codimension)
569 conf (value, external)
571 conf (codimension, result)
574 && (attr->intent == INTENT_OUT || attr->intent == INTENT_INOUT))
577 a2 = attr->intent == INTENT_OUT ? intent_out : intent_inout;
581 conf (is_protected, intrinsic)
582 conf (is_protected, in_common)
584 conf (asynchronous, intrinsic)
585 conf (asynchronous, external)
587 conf (volatile_, intrinsic)
588 conf (volatile_, external)
590 if (attr->volatile_ && attr->intent == INTENT_IN)
597 conf (procedure, allocatable)
598 conf (procedure, dimension)
599 conf (procedure, codimension)
600 conf (procedure, intrinsic)
601 conf (procedure, target)
602 conf (procedure, value)
603 conf (procedure, volatile_)
604 conf (procedure, asynchronous)
605 conf (procedure, entry)
607 a1 = gfc_code2string (flavors, attr->flavor);
609 if (attr->in_namelist
610 && attr->flavor != FL_VARIABLE
611 && attr->flavor != FL_PROCEDURE
612 && attr->flavor != FL_UNKNOWN)
618 switch (attr->flavor)
628 conf2 (asynchronous);
631 conf2 (is_protected);
641 conf2 (threadprivate);
643 if (attr->access == ACCESS_PUBLIC || attr->access == ACCESS_PRIVATE)
645 a2 = attr->access == ACCESS_PUBLIC ? publik : privat;
646 gfc_error ("%s attribute applied to %s %s at %L", a2, a1,
653 gfc_error_now ("BIND(C) applied to %s %s at %L", a1, name, where);
667 /* Conflicts with INTENT, SAVE and RESULT will be checked
668 at resolution stage, see "resolve_fl_procedure". */
670 if (attr->subroutine)
676 conf2 (asynchronous);
681 if (!attr->proc_pointer)
682 conf2 (threadprivate);
685 if (!attr->proc_pointer)
690 case PROC_ST_FUNCTION:
701 conf2 (threadprivate);
721 conf2 (threadprivate);
724 if (attr->intent != INTENT_UNKNOWN)
741 conf2 (is_protected);
747 conf2 (asynchronous);
748 conf2 (threadprivate);
764 gfc_error ("%s attribute conflicts with %s attribute at %L",
767 gfc_error ("%s attribute conflicts with %s attribute in '%s' at %L",
768 a1, a2, name, where);
775 return gfc_notify_std (standard, "%s attribute "
776 "with %s attribute at %L", a1, a2,
781 return gfc_notify_std (standard, "%s attribute "
782 "with %s attribute in '%s' at %L",
783 a1, a2, name, where);
792 /* Mark a symbol as referenced. */
795 gfc_set_sym_referenced (gfc_symbol *sym)
798 if (sym->attr.referenced)
801 sym->attr.referenced = 1;
803 /* Remember which order dummy variables are accessed in. */
805 sym->dummy_order = next_dummy_order++;
809 /* Common subroutine called by attribute changing subroutines in order
810 to prevent them from changing a symbol that has been
811 use-associated. Returns zero if it is OK to change the symbol,
815 check_used (symbol_attribute *attr, const char *name, locus *where)
818 if (attr->use_assoc == 0)
822 where = &gfc_current_locus;
825 gfc_error ("Cannot change attributes of USE-associated symbol at %L",
828 gfc_error ("Cannot change attributes of USE-associated symbol %s at %L",
835 /* Generate an error because of a duplicate attribute. */
838 duplicate_attr (const char *attr, locus *where)
842 where = &gfc_current_locus;
844 gfc_error ("Duplicate %s attribute specified at %L", attr, where);
849 gfc_add_ext_attribute (symbol_attribute *attr, ext_attr_id_t ext_attr,
850 locus *where ATTRIBUTE_UNUSED)
852 attr->ext_attr |= 1 << ext_attr;
857 /* Called from decl.c (attr_decl1) to check attributes, when declared
861 gfc_add_attribute (symbol_attribute *attr, locus *where)
863 if (check_used (attr, NULL, where))
866 return check_conflict (attr, NULL, where);
871 gfc_add_allocatable (symbol_attribute *attr, locus *where)
874 if (check_used (attr, NULL, where))
877 if (attr->allocatable)
879 duplicate_attr ("ALLOCATABLE", where);
883 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
884 && gfc_find_state (COMP_INTERFACE) == FAILURE)
886 gfc_error ("ALLOCATABLE specified outside of INTERFACE body at %L",
891 attr->allocatable = 1;
892 return check_conflict (attr, NULL, where);
897 gfc_add_codimension (symbol_attribute *attr, const char *name, locus *where)
900 if (check_used (attr, name, where))
903 if (attr->codimension)
905 duplicate_attr ("CODIMENSION", where);
909 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
910 && gfc_find_state (COMP_INTERFACE) == FAILURE)
912 gfc_error ("CODIMENSION specified for '%s' outside its INTERFACE body "
913 "at %L", name, where);
917 attr->codimension = 1;
918 return check_conflict (attr, name, where);
923 gfc_add_dimension (symbol_attribute *attr, const char *name, locus *where)
926 if (check_used (attr, name, where))
931 duplicate_attr ("DIMENSION", where);
935 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
936 && gfc_find_state (COMP_INTERFACE) == FAILURE)
938 gfc_error ("DIMENSION specified for '%s' outside its INTERFACE body "
939 "at %L", name, where);
944 return check_conflict (attr, name, where);
949 gfc_add_contiguous (symbol_attribute *attr, const char *name, locus *where)
952 if (check_used (attr, name, where))
955 attr->contiguous = 1;
956 return check_conflict (attr, name, where);
961 gfc_add_external (symbol_attribute *attr, locus *where)
964 if (check_used (attr, NULL, where))
969 duplicate_attr ("EXTERNAL", where);
973 if (attr->pointer && attr->if_source != IFSRC_IFBODY)
976 attr->proc_pointer = 1;
981 return check_conflict (attr, NULL, where);
986 gfc_add_intrinsic (symbol_attribute *attr, locus *where)
989 if (check_used (attr, NULL, where))
994 duplicate_attr ("INTRINSIC", where);
1000 return check_conflict (attr, NULL, where);
1005 gfc_add_optional (symbol_attribute *attr, locus *where)
1008 if (check_used (attr, NULL, where))
1013 duplicate_attr ("OPTIONAL", where);
1018 return check_conflict (attr, NULL, where);
1023 gfc_add_pointer (symbol_attribute *attr, locus *where)
1026 if (check_used (attr, NULL, where))
1029 if (attr->pointer && !(attr->if_source == IFSRC_IFBODY
1030 && gfc_find_state (COMP_INTERFACE) == FAILURE))
1032 duplicate_attr ("POINTER", where);
1036 if (attr->procedure || (attr->external && attr->if_source != IFSRC_IFBODY)
1037 || (attr->if_source == IFSRC_IFBODY
1038 && gfc_find_state (COMP_INTERFACE) == FAILURE))
1039 attr->proc_pointer = 1;
1043 return check_conflict (attr, NULL, where);
1048 gfc_add_cray_pointer (symbol_attribute *attr, locus *where)
1051 if (check_used (attr, NULL, where))
1054 attr->cray_pointer = 1;
1055 return check_conflict (attr, NULL, where);
1060 gfc_add_cray_pointee (symbol_attribute *attr, locus *where)
1063 if (check_used (attr, NULL, where))
1066 if (attr->cray_pointee)
1068 gfc_error ("Cray Pointee at %L appears in multiple pointer()"
1069 " statements", where);
1073 attr->cray_pointee = 1;
1074 return check_conflict (attr, NULL, where);
1079 gfc_add_protected (symbol_attribute *attr, const char *name, locus *where)
1081 if (check_used (attr, name, where))
1084 if (attr->is_protected)
1086 if (gfc_notify_std (GFC_STD_LEGACY,
1087 "Duplicate PROTECTED attribute specified at %L",
1093 attr->is_protected = 1;
1094 return check_conflict (attr, name, where);
1099 gfc_add_result (symbol_attribute *attr, const char *name, locus *where)
1102 if (check_used (attr, name, where))
1106 return check_conflict (attr, name, where);
1111 gfc_add_save (symbol_attribute *attr, save_state s, const char *name,
1115 if (check_used (attr, name, where))
1118 if (s == SAVE_EXPLICIT && gfc_pure (NULL))
1121 ("SAVE attribute at %L cannot be specified in a PURE procedure",
1126 if (s == SAVE_EXPLICIT && gfc_implicit_pure (NULL))
1127 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1129 if (s == SAVE_EXPLICIT && attr->save == SAVE_EXPLICIT)
1131 if (gfc_notify_std (GFC_STD_LEGACY,
1132 "Duplicate SAVE attribute specified at %L",
1139 return check_conflict (attr, name, where);
1144 gfc_add_value (symbol_attribute *attr, const char *name, locus *where)
1147 if (check_used (attr, name, where))
1152 if (gfc_notify_std (GFC_STD_LEGACY,
1153 "Duplicate VALUE attribute specified at %L",
1160 return check_conflict (attr, name, where);
1165 gfc_add_volatile (symbol_attribute *attr, const char *name, locus *where)
1167 /* No check_used needed as 11.2.1 of the F2003 standard allows
1168 that the local identifier made accessible by a use statement can be
1169 given a VOLATILE attribute - unless it is a coarray (F2008, C560). */
1171 if (attr->volatile_ && attr->volatile_ns == gfc_current_ns)
1172 if (gfc_notify_std (GFC_STD_LEGACY,
1173 "Duplicate VOLATILE attribute specified at %L", where)
1177 attr->volatile_ = 1;
1178 attr->volatile_ns = gfc_current_ns;
1179 return check_conflict (attr, name, where);
1184 gfc_add_asynchronous (symbol_attribute *attr, const char *name, locus *where)
1186 /* No check_used needed as 11.2.1 of the F2003 standard allows
1187 that the local identifier made accessible by a use statement can be
1188 given a ASYNCHRONOUS attribute. */
1190 if (attr->asynchronous && attr->asynchronous_ns == gfc_current_ns)
1191 if (gfc_notify_std (GFC_STD_LEGACY,
1192 "Duplicate ASYNCHRONOUS attribute specified at %L",
1196 attr->asynchronous = 1;
1197 attr->asynchronous_ns = gfc_current_ns;
1198 return check_conflict (attr, name, where);
1203 gfc_add_threadprivate (symbol_attribute *attr, const char *name, locus *where)
1206 if (check_used (attr, name, where))
1209 if (attr->threadprivate)
1211 duplicate_attr ("THREADPRIVATE", where);
1215 attr->threadprivate = 1;
1216 return check_conflict (attr, name, where);
1221 gfc_add_target (symbol_attribute *attr, locus *where)
1224 if (check_used (attr, NULL, where))
1229 duplicate_attr ("TARGET", where);
1234 return check_conflict (attr, NULL, where);
1239 gfc_add_dummy (symbol_attribute *attr, const char *name, locus *where)
1242 if (check_used (attr, name, where))
1245 /* Duplicate dummy arguments are allowed due to ENTRY statements. */
1247 return check_conflict (attr, name, where);
1252 gfc_add_in_common (symbol_attribute *attr, const char *name, locus *where)
1255 if (check_used (attr, name, where))
1258 /* Duplicate attribute already checked for. */
1259 attr->in_common = 1;
1260 return check_conflict (attr, name, where);
1265 gfc_add_in_equivalence (symbol_attribute *attr, const char *name, locus *where)
1268 /* Duplicate attribute already checked for. */
1269 attr->in_equivalence = 1;
1270 if (check_conflict (attr, name, where) == FAILURE)
1273 if (attr->flavor == FL_VARIABLE)
1276 return gfc_add_flavor (attr, FL_VARIABLE, name, where);
1281 gfc_add_data (symbol_attribute *attr, const char *name, locus *where)
1284 if (check_used (attr, name, where))
1288 return check_conflict (attr, name, where);
1293 gfc_add_in_namelist (symbol_attribute *attr, const char *name, locus *where)
1296 attr->in_namelist = 1;
1297 return check_conflict (attr, name, where);
1302 gfc_add_sequence (symbol_attribute *attr, const char *name, locus *where)
1305 if (check_used (attr, name, where))
1309 return check_conflict (attr, name, where);
1314 gfc_add_elemental (symbol_attribute *attr, locus *where)
1317 if (check_used (attr, NULL, where))
1320 if (attr->elemental)
1322 duplicate_attr ("ELEMENTAL", where);
1326 attr->elemental = 1;
1327 return check_conflict (attr, NULL, where);
1332 gfc_add_pure (symbol_attribute *attr, locus *where)
1335 if (check_used (attr, NULL, where))
1340 duplicate_attr ("PURE", where);
1345 return check_conflict (attr, NULL, where);
1350 gfc_add_recursive (symbol_attribute *attr, locus *where)
1353 if (check_used (attr, NULL, where))
1356 if (attr->recursive)
1358 duplicate_attr ("RECURSIVE", where);
1362 attr->recursive = 1;
1363 return check_conflict (attr, NULL, where);
1368 gfc_add_entry (symbol_attribute *attr, const char *name, locus *where)
1371 if (check_used (attr, name, where))
1376 duplicate_attr ("ENTRY", where);
1381 return check_conflict (attr, name, where);
1386 gfc_add_function (symbol_attribute *attr, const char *name, locus *where)
1389 if (attr->flavor != FL_PROCEDURE
1390 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1394 return check_conflict (attr, name, where);
1399 gfc_add_subroutine (symbol_attribute *attr, const char *name, locus *where)
1402 if (attr->flavor != FL_PROCEDURE
1403 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1406 attr->subroutine = 1;
1407 return check_conflict (attr, name, where);
1412 gfc_add_generic (symbol_attribute *attr, const char *name, locus *where)
1415 if (attr->flavor != FL_PROCEDURE
1416 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1420 return check_conflict (attr, name, where);
1425 gfc_add_proc (symbol_attribute *attr, const char *name, locus *where)
1428 if (check_used (attr, NULL, where))
1431 if (attr->flavor != FL_PROCEDURE
1432 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1435 if (attr->procedure)
1437 duplicate_attr ("PROCEDURE", where);
1441 attr->procedure = 1;
1443 return check_conflict (attr, NULL, where);
1448 gfc_add_abstract (symbol_attribute* attr, locus* where)
1452 duplicate_attr ("ABSTRACT", where);
1461 /* Flavors are special because some flavors are not what Fortran
1462 considers attributes and can be reaffirmed multiple times. */
1465 gfc_add_flavor (symbol_attribute *attr, sym_flavor f, const char *name,
1469 if ((f == FL_PROGRAM || f == FL_BLOCK_DATA || f == FL_MODULE
1470 || f == FL_PARAMETER || f == FL_LABEL || f == FL_DERIVED
1471 || f == FL_NAMELIST) && check_used (attr, name, where))
1474 if (attr->flavor == f && f == FL_VARIABLE)
1477 if (attr->flavor != FL_UNKNOWN)
1480 where = &gfc_current_locus;
1483 gfc_error ("%s attribute of '%s' conflicts with %s attribute at %L",
1484 gfc_code2string (flavors, attr->flavor), name,
1485 gfc_code2string (flavors, f), where);
1487 gfc_error ("%s attribute conflicts with %s attribute at %L",
1488 gfc_code2string (flavors, attr->flavor),
1489 gfc_code2string (flavors, f), where);
1496 return check_conflict (attr, name, where);
1501 gfc_add_procedure (symbol_attribute *attr, procedure_type t,
1502 const char *name, locus *where)
1505 if (check_used (attr, name, where))
1508 if (attr->flavor != FL_PROCEDURE
1509 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1513 where = &gfc_current_locus;
1515 if (attr->proc != PROC_UNKNOWN)
1517 gfc_error ("%s procedure at %L is already declared as %s procedure",
1518 gfc_code2string (procedures, t), where,
1519 gfc_code2string (procedures, attr->proc));
1526 /* Statement functions are always scalar and functions. */
1527 if (t == PROC_ST_FUNCTION
1528 && ((!attr->function && gfc_add_function (attr, name, where) == FAILURE)
1529 || attr->dimension))
1532 return check_conflict (attr, name, where);
1537 gfc_add_intent (symbol_attribute *attr, sym_intent intent, locus *where)
1540 if (check_used (attr, NULL, where))
1543 if (attr->intent == INTENT_UNKNOWN)
1545 attr->intent = intent;
1546 return check_conflict (attr, NULL, where);
1550 where = &gfc_current_locus;
1552 gfc_error ("INTENT (%s) conflicts with INTENT(%s) at %L",
1553 gfc_intent_string (attr->intent),
1554 gfc_intent_string (intent), where);
1560 /* No checks for use-association in public and private statements. */
1563 gfc_add_access (symbol_attribute *attr, gfc_access access,
1564 const char *name, locus *where)
1567 if (attr->access == ACCESS_UNKNOWN
1568 || (attr->use_assoc && attr->access != ACCESS_PRIVATE))
1570 attr->access = access;
1571 return check_conflict (attr, name, where);
1575 where = &gfc_current_locus;
1576 gfc_error ("ACCESS specification at %L was already specified", where);
1582 /* Set the is_bind_c field for the given symbol_attribute. */
1585 gfc_add_is_bind_c (symbol_attribute *attr, const char *name, locus *where,
1586 int is_proc_lang_bind_spec)
1589 if (is_proc_lang_bind_spec == 0 && attr->flavor == FL_PROCEDURE)
1590 gfc_error_now ("BIND(C) attribute at %L can only be used for "
1591 "variables or common blocks", where);
1592 else if (attr->is_bind_c)
1593 gfc_error_now ("Duplicate BIND attribute specified at %L", where);
1595 attr->is_bind_c = 1;
1598 where = &gfc_current_locus;
1600 if (gfc_notify_std (GFC_STD_F2003, "BIND(C) at %L", where)
1604 return check_conflict (attr, name, where);
1608 /* Set the extension field for the given symbol_attribute. */
1611 gfc_add_extension (symbol_attribute *attr, locus *where)
1614 where = &gfc_current_locus;
1616 if (attr->extension)
1617 gfc_error_now ("Duplicate EXTENDS attribute specified at %L", where);
1619 attr->extension = 1;
1621 if (gfc_notify_std (GFC_STD_F2003, "EXTENDS at %L", where)
1630 gfc_add_explicit_interface (gfc_symbol *sym, ifsrc source,
1631 gfc_formal_arglist * formal, locus *where)
1634 if (check_used (&sym->attr, sym->name, where))
1638 where = &gfc_current_locus;
1640 if (sym->attr.if_source != IFSRC_UNKNOWN
1641 && sym->attr.if_source != IFSRC_DECL)
1643 gfc_error ("Symbol '%s' at %L already has an explicit interface",
1648 if (source == IFSRC_IFBODY && (sym->attr.dimension || sym->attr.allocatable))
1650 gfc_error ("'%s' at %L has attributes specified outside its INTERFACE "
1651 "body", sym->name, where);
1655 sym->formal = formal;
1656 sym->attr.if_source = source;
1662 /* Add a type to a symbol. */
1665 gfc_add_type (gfc_symbol *sym, gfc_typespec *ts, locus *where)
1671 where = &gfc_current_locus;
1674 type = sym->result->ts.type;
1676 type = sym->ts.type;
1678 if (sym->attr.result && type == BT_UNKNOWN && sym->ns->proc_name)
1679 type = sym->ns->proc_name->ts.type;
1681 if (type != BT_UNKNOWN && !(sym->attr.function && sym->attr.implicit_type))
1683 if (sym->attr.use_assoc)
1684 gfc_error ("Symbol '%s' at %L conflicts with symbol from module '%s', "
1685 "use-associated at %L", sym->name, where, sym->module,
1688 gfc_error ("Symbol '%s' at %L already has basic type of %s", sym->name,
1689 where, gfc_basic_typename (type));
1693 if (sym->attr.procedure && sym->ts.interface)
1695 gfc_error ("Procedure '%s' at %L may not have basic type of %s",
1696 sym->name, where, gfc_basic_typename (ts->type));
1700 flavor = sym->attr.flavor;
1702 if (flavor == FL_PROGRAM || flavor == FL_BLOCK_DATA || flavor == FL_MODULE
1703 || flavor == FL_LABEL
1704 || (flavor == FL_PROCEDURE && sym->attr.subroutine)
1705 || flavor == FL_DERIVED || flavor == FL_NAMELIST)
1707 gfc_error ("Symbol '%s' at %L cannot have a type", sym->name, where);
1716 /* Clears all attributes. */
1719 gfc_clear_attr (symbol_attribute *attr)
1721 memset (attr, 0, sizeof (symbol_attribute));
1725 /* Check for missing attributes in the new symbol. Currently does
1726 nothing, but it's not clear that it is unnecessary yet. */
1729 gfc_missing_attr (symbol_attribute *attr ATTRIBUTE_UNUSED,
1730 locus *where ATTRIBUTE_UNUSED)
1737 /* Copy an attribute to a symbol attribute, bit by bit. Some
1738 attributes have a lot of side-effects but cannot be present given
1739 where we are called from, so we ignore some bits. */
1742 gfc_copy_attr (symbol_attribute *dest, symbol_attribute *src, locus *where)
1744 int is_proc_lang_bind_spec;
1746 /* In line with the other attributes, we only add bits but do not remove
1747 them; cf. also PR 41034. */
1748 dest->ext_attr |= src->ext_attr;
1750 if (src->allocatable && gfc_add_allocatable (dest, where) == FAILURE)
1753 if (src->dimension && gfc_add_dimension (dest, NULL, where) == FAILURE)
1755 if (src->codimension && gfc_add_codimension (dest, NULL, where) == FAILURE)
1757 if (src->contiguous && gfc_add_contiguous (dest, NULL, where) == FAILURE)
1759 if (src->optional && gfc_add_optional (dest, where) == FAILURE)
1761 if (src->pointer && gfc_add_pointer (dest, where) == FAILURE)
1763 if (src->is_protected && gfc_add_protected (dest, NULL, where) == FAILURE)
1765 if (src->save && gfc_add_save (dest, src->save, NULL, where) == FAILURE)
1767 if (src->value && gfc_add_value (dest, NULL, where) == FAILURE)
1769 if (src->volatile_ && gfc_add_volatile (dest, NULL, where) == FAILURE)
1771 if (src->asynchronous && gfc_add_asynchronous (dest, NULL, where) == FAILURE)
1773 if (src->threadprivate
1774 && gfc_add_threadprivate (dest, NULL, where) == FAILURE)
1776 if (src->target && gfc_add_target (dest, where) == FAILURE)
1778 if (src->dummy && gfc_add_dummy (dest, NULL, where) == FAILURE)
1780 if (src->result && gfc_add_result (dest, NULL, where) == FAILURE)
1785 if (src->in_namelist && gfc_add_in_namelist (dest, NULL, where) == FAILURE)
1788 if (src->in_common && gfc_add_in_common (dest, NULL, where) == FAILURE)
1791 if (src->generic && gfc_add_generic (dest, NULL, where) == FAILURE)
1793 if (src->function && gfc_add_function (dest, NULL, where) == FAILURE)
1795 if (src->subroutine && gfc_add_subroutine (dest, NULL, where) == FAILURE)
1798 if (src->sequence && gfc_add_sequence (dest, NULL, where) == FAILURE)
1800 if (src->elemental && gfc_add_elemental (dest, where) == FAILURE)
1802 if (src->pure && gfc_add_pure (dest, where) == FAILURE)
1804 if (src->recursive && gfc_add_recursive (dest, where) == FAILURE)
1807 if (src->flavor != FL_UNKNOWN
1808 && gfc_add_flavor (dest, src->flavor, NULL, where) == FAILURE)
1811 if (src->intent != INTENT_UNKNOWN
1812 && gfc_add_intent (dest, src->intent, where) == FAILURE)
1815 if (src->access != ACCESS_UNKNOWN
1816 && gfc_add_access (dest, src->access, NULL, where) == FAILURE)
1819 if (gfc_missing_attr (dest, where) == FAILURE)
1822 if (src->cray_pointer && gfc_add_cray_pointer (dest, where) == FAILURE)
1824 if (src->cray_pointee && gfc_add_cray_pointee (dest, where) == FAILURE)
1827 is_proc_lang_bind_spec = (src->flavor == FL_PROCEDURE ? 1 : 0);
1829 && gfc_add_is_bind_c (dest, NULL, where, is_proc_lang_bind_spec)
1833 if (src->is_c_interop)
1834 dest->is_c_interop = 1;
1838 if (src->external && gfc_add_external (dest, where) == FAILURE)
1840 if (src->intrinsic && gfc_add_intrinsic (dest, where) == FAILURE)
1842 if (src->proc_pointer)
1843 dest->proc_pointer = 1;
1852 /************** Component name management ************/
1854 /* Component names of a derived type form their own little namespaces
1855 that are separate from all other spaces. The space is composed of
1856 a singly linked list of gfc_component structures whose head is
1857 located in the parent symbol. */
1860 /* Add a component name to a symbol. The call fails if the name is
1861 already present. On success, the component pointer is modified to
1862 point to the additional component structure. */
1865 gfc_add_component (gfc_symbol *sym, const char *name,
1866 gfc_component **component)
1868 gfc_component *p, *tail;
1872 for (p = sym->components; p; p = p->next)
1874 if (strcmp (p->name, name) == 0)
1876 gfc_error ("Component '%s' at %C already declared at %L",
1884 if (sym->attr.extension
1885 && gfc_find_component (sym->components->ts.u.derived, name, true, true))
1887 gfc_error ("Component '%s' at %C already in the parent type "
1888 "at %L", name, &sym->components->ts.u.derived->declared_at);
1892 /* Allocate a new component. */
1893 p = gfc_get_component ();
1896 sym->components = p;
1900 p->name = gfc_get_string (name);
1901 p->loc = gfc_current_locus;
1902 p->ts.type = BT_UNKNOWN;
1909 /* Recursive function to switch derived types of all symbol in a
1913 switch_types (gfc_symtree *st, gfc_symbol *from, gfc_symbol *to)
1921 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived == from)
1922 sym->ts.u.derived = to;
1924 switch_types (st->left, from, to);
1925 switch_types (st->right, from, to);
1929 /* This subroutine is called when a derived type is used in order to
1930 make the final determination about which version to use. The
1931 standard requires that a type be defined before it is 'used', but
1932 such types can appear in IMPLICIT statements before the actual
1933 definition. 'Using' in this context means declaring a variable to
1934 be that type or using the type constructor.
1936 If a type is used and the components haven't been defined, then we
1937 have to have a derived type in a parent unit. We find the node in
1938 the other namespace and point the symtree node in this namespace to
1939 that node. Further reference to this name point to the correct
1940 node. If we can't find the node in a parent namespace, then we have
1943 This subroutine takes a pointer to a symbol node and returns a
1944 pointer to the translated node or NULL for an error. Usually there
1945 is no translation and we return the node we were passed. */
1948 gfc_use_derived (gfc_symbol *sym)
1958 if (sym->attr.generic)
1959 sym = gfc_find_dt_in_generic (sym);
1961 if (sym->components != NULL || sym->attr.zero_comp)
1962 return sym; /* Already defined. */
1964 if (sym->ns->parent == NULL)
1967 if (gfc_find_symbol (sym->name, sym->ns->parent, 1, &s))
1969 gfc_error ("Symbol '%s' at %C is ambiguous", sym->name);
1973 if (s == NULL || s->attr.flavor != FL_DERIVED)
1976 /* Get rid of symbol sym, translating all references to s. */
1977 for (i = 0; i < GFC_LETTERS; i++)
1979 t = &sym->ns->default_type[i];
1980 if (t->u.derived == sym)
1984 st = gfc_find_symtree (sym->ns->sym_root, sym->name);
1989 /* Unlink from list of modified symbols. */
1990 gfc_commit_symbol (sym);
1992 switch_types (sym->ns->sym_root, sym, s);
1994 /* TODO: Also have to replace sym -> s in other lists like
1995 namelists, common lists and interface lists. */
1996 gfc_free_symbol (sym);
2001 gfc_error ("Derived type '%s' at %C is being used before it is defined",
2007 /* Given a derived type node and a component name, try to locate the
2008 component structure. Returns the NULL pointer if the component is
2009 not found or the components are private. If noaccess is set, no access
2013 gfc_find_component (gfc_symbol *sym, const char *name,
2014 bool noaccess, bool silent)
2018 if (name == NULL || sym == NULL)
2021 sym = gfc_use_derived (sym);
2026 for (p = sym->components; p; p = p->next)
2027 if (strcmp (p->name, name) == 0)
2030 if (p && sym->attr.use_assoc && !noaccess)
2032 bool is_parent_comp = sym->attr.extension && (p == sym->components);
2033 if (p->attr.access == ACCESS_PRIVATE ||
2034 (p->attr.access != ACCESS_PUBLIC
2035 && sym->component_access == ACCESS_PRIVATE
2036 && !is_parent_comp))
2039 gfc_error ("Component '%s' at %C is a PRIVATE component of '%s'",
2046 && sym->attr.extension
2047 && sym->components->ts.type == BT_DERIVED)
2049 p = gfc_find_component (sym->components->ts.u.derived, name,
2051 /* Do not overwrite the error. */
2056 if (p == NULL && !silent)
2057 gfc_error ("'%s' at %C is not a member of the '%s' structure",
2064 /* Given a symbol, free all of the component structures and everything
2068 free_components (gfc_component *p)
2076 gfc_free_array_spec (p->as);
2077 gfc_free_expr (p->initializer);
2079 gfc_free_formal_arglist (p->formal);
2080 gfc_free_namespace (p->formal_ns);
2087 /******************** Statement label management ********************/
2089 /* Comparison function for statement labels, used for managing the
2093 compare_st_labels (void *a1, void *b1)
2095 int a = ((gfc_st_label *) a1)->value;
2096 int b = ((gfc_st_label *) b1)->value;
2102 /* Free a single gfc_st_label structure, making sure the tree is not
2103 messed up. This function is called only when some parse error
2107 gfc_free_st_label (gfc_st_label *label)
2113 gfc_delete_bbt (&gfc_current_ns->st_labels, label, compare_st_labels);
2115 if (label->format != NULL)
2116 gfc_free_expr (label->format);
2122 /* Free a whole tree of gfc_st_label structures. */
2125 free_st_labels (gfc_st_label *label)
2131 free_st_labels (label->left);
2132 free_st_labels (label->right);
2134 if (label->format != NULL)
2135 gfc_free_expr (label->format);
2140 /* Given a label number, search for and return a pointer to the label
2141 structure, creating it if it does not exist. */
2144 gfc_get_st_label (int labelno)
2149 if (gfc_current_state () == COMP_DERIVED)
2150 ns = gfc_current_block ()->f2k_derived;
2153 /* Find the namespace of the scoping unit:
2154 If we're in a BLOCK construct, jump to the parent namespace. */
2155 ns = gfc_current_ns;
2156 while (ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL)
2160 /* First see if the label is already in this namespace. */
2164 if (lp->value == labelno)
2167 if (lp->value < labelno)
2173 lp = XCNEW (gfc_st_label);
2175 lp->value = labelno;
2176 lp->defined = ST_LABEL_UNKNOWN;
2177 lp->referenced = ST_LABEL_UNKNOWN;
2179 gfc_insert_bbt (&ns->st_labels, lp, compare_st_labels);
2185 /* Called when a statement with a statement label is about to be
2186 accepted. We add the label to the list of the current namespace,
2187 making sure it hasn't been defined previously and referenced
2191 gfc_define_st_label (gfc_st_label *lp, gfc_sl_type type, locus *label_locus)
2195 labelno = lp->value;
2197 if (lp->defined != ST_LABEL_UNKNOWN)
2198 gfc_error ("Duplicate statement label %d at %L and %L", labelno,
2199 &lp->where, label_locus);
2202 lp->where = *label_locus;
2206 case ST_LABEL_FORMAT:
2207 if (lp->referenced == ST_LABEL_TARGET
2208 || lp->referenced == ST_LABEL_DO_TARGET)
2209 gfc_error ("Label %d at %C already referenced as branch target",
2212 lp->defined = ST_LABEL_FORMAT;
2216 case ST_LABEL_TARGET:
2217 case ST_LABEL_DO_TARGET:
2218 if (lp->referenced == ST_LABEL_FORMAT)
2219 gfc_error ("Label %d at %C already referenced as a format label",
2224 if (lp->referenced == ST_LABEL_DO_TARGET && type != ST_LABEL_DO_TARGET
2225 && gfc_notify_std (GFC_STD_F95_OBS, "DO termination statement "
2226 "which is not END DO or CONTINUE with label "
2227 "%d at %C", labelno) == FAILURE)
2232 lp->defined = ST_LABEL_BAD_TARGET;
2233 lp->referenced = ST_LABEL_BAD_TARGET;
2239 /* Reference a label. Given a label and its type, see if that
2240 reference is consistent with what is known about that label,
2241 updating the unknown state. Returns FAILURE if something goes
2245 gfc_reference_st_label (gfc_st_label *lp, gfc_sl_type type)
2247 gfc_sl_type label_type;
2254 labelno = lp->value;
2256 if (lp->defined != ST_LABEL_UNKNOWN)
2257 label_type = lp->defined;
2260 label_type = lp->referenced;
2261 lp->where = gfc_current_locus;
2264 if (label_type == ST_LABEL_FORMAT
2265 && (type == ST_LABEL_TARGET || type == ST_LABEL_DO_TARGET))
2267 gfc_error ("Label %d at %C previously used as a FORMAT label", labelno);
2272 if ((label_type == ST_LABEL_TARGET || label_type == ST_LABEL_DO_TARGET
2273 || label_type == ST_LABEL_BAD_TARGET)
2274 && type == ST_LABEL_FORMAT)
2276 gfc_error ("Label %d at %C previously used as branch target", labelno);
2281 if (lp->referenced == ST_LABEL_DO_TARGET && type == ST_LABEL_DO_TARGET
2282 && gfc_notify_std (GFC_STD_F95_OBS, "Shared DO termination label %d "
2283 "at %C", labelno) == FAILURE)
2286 if (lp->referenced != ST_LABEL_DO_TARGET)
2287 lp->referenced = type;
2295 /************** Symbol table management subroutines ****************/
2297 /* Basic details: Fortran 95 requires a potentially unlimited number
2298 of distinct namespaces when compiling a program unit. This case
2299 occurs during a compilation of internal subprograms because all of
2300 the internal subprograms must be read before we can start
2301 generating code for the host.
2303 Given the tricky nature of the Fortran grammar, we must be able to
2304 undo changes made to a symbol table if the current interpretation
2305 of a statement is found to be incorrect. Whenever a symbol is
2306 looked up, we make a copy of it and link to it. All of these
2307 symbols are kept in a singly linked list so that we can commit or
2308 undo the changes at a later time.
2310 A symtree may point to a symbol node outside of its namespace. In
2311 this case, that symbol has been used as a host associated variable
2312 at some previous time. */
2314 /* Allocate a new namespace structure. Copies the implicit types from
2315 PARENT if PARENT_TYPES is set. */
2318 gfc_get_namespace (gfc_namespace *parent, int parent_types)
2325 ns = XCNEW (gfc_namespace);
2326 ns->sym_root = NULL;
2327 ns->uop_root = NULL;
2328 ns->tb_sym_root = NULL;
2329 ns->finalizers = NULL;
2330 ns->default_access = ACCESS_UNKNOWN;
2331 ns->parent = parent;
2333 for (in = GFC_INTRINSIC_BEGIN; in != GFC_INTRINSIC_END; in++)
2335 ns->operator_access[in] = ACCESS_UNKNOWN;
2336 ns->tb_op[in] = NULL;
2339 /* Initialize default implicit types. */
2340 for (i = 'a'; i <= 'z'; i++)
2342 ns->set_flag[i - 'a'] = 0;
2343 ts = &ns->default_type[i - 'a'];
2345 if (parent_types && ns->parent != NULL)
2347 /* Copy parent settings. */
2348 *ts = ns->parent->default_type[i - 'a'];
2352 if (gfc_option.flag_implicit_none != 0)
2358 if ('i' <= i && i <= 'n')
2360 ts->type = BT_INTEGER;
2361 ts->kind = gfc_default_integer_kind;
2366 ts->kind = gfc_default_real_kind;
2376 /* Comparison function for symtree nodes. */
2379 compare_symtree (void *_st1, void *_st2)
2381 gfc_symtree *st1, *st2;
2383 st1 = (gfc_symtree *) _st1;
2384 st2 = (gfc_symtree *) _st2;
2386 return strcmp (st1->name, st2->name);
2390 /* Allocate a new symtree node and associate it with the new symbol. */
2393 gfc_new_symtree (gfc_symtree **root, const char *name)
2397 st = XCNEW (gfc_symtree);
2398 st->name = gfc_get_string (name);
2400 gfc_insert_bbt (root, st, compare_symtree);
2405 /* Delete a symbol from the tree. Does not free the symbol itself! */
2408 gfc_delete_symtree (gfc_symtree **root, const char *name)
2410 gfc_symtree st, *st0;
2412 st0 = gfc_find_symtree (*root, name);
2414 st.name = gfc_get_string (name);
2415 gfc_delete_bbt (root, &st, compare_symtree);
2421 /* Given a root symtree node and a name, try to find the symbol within
2422 the namespace. Returns NULL if the symbol is not found. */
2425 gfc_find_symtree (gfc_symtree *st, const char *name)
2431 c = strcmp (name, st->name);
2435 st = (c < 0) ? st->left : st->right;
2442 /* Return a symtree node with a name that is guaranteed to be unique
2443 within the namespace and corresponds to an illegal fortran name. */
2446 gfc_get_unique_symtree (gfc_namespace *ns)
2448 char name[GFC_MAX_SYMBOL_LEN + 1];
2449 static int serial = 0;
2451 sprintf (name, "@%d", serial++);
2452 return gfc_new_symtree (&ns->sym_root, name);
2456 /* Given a name find a user operator node, creating it if it doesn't
2457 exist. These are much simpler than symbols because they can't be
2458 ambiguous with one another. */
2461 gfc_get_uop (const char *name)
2466 st = gfc_find_symtree (gfc_current_ns->uop_root, name);
2470 st = gfc_new_symtree (&gfc_current_ns->uop_root, name);
2472 uop = st->n.uop = XCNEW (gfc_user_op);
2473 uop->name = gfc_get_string (name);
2474 uop->access = ACCESS_UNKNOWN;
2475 uop->ns = gfc_current_ns;
2481 /* Given a name find the user operator node. Returns NULL if it does
2485 gfc_find_uop (const char *name, gfc_namespace *ns)
2490 ns = gfc_current_ns;
2492 st = gfc_find_symtree (ns->uop_root, name);
2493 return (st == NULL) ? NULL : st->n.uop;
2497 /* Remove a gfc_symbol structure and everything it points to. */
2500 gfc_free_symbol (gfc_symbol *sym)
2506 gfc_free_array_spec (sym->as);
2508 free_components (sym->components);
2510 gfc_free_expr (sym->value);
2512 gfc_free_namelist (sym->namelist);
2514 gfc_free_namespace (sym->formal_ns);
2516 if (!sym->attr.generic_copy)
2517 gfc_free_interface (sym->generic);
2519 gfc_free_formal_arglist (sym->formal);
2521 gfc_free_namespace (sym->f2k_derived);
2527 /* Decrease the reference counter and free memory when we reach zero. */
2530 gfc_release_symbol (gfc_symbol *sym)
2535 if (sym->formal_ns != NULL && sym->refs == 2)
2537 /* As formal_ns contains a reference to sym, delete formal_ns just
2538 before the deletion of sym. */
2539 gfc_namespace *ns = sym->formal_ns;
2540 sym->formal_ns = NULL;
2541 gfc_free_namespace (ns);
2548 gcc_assert (sym->refs == 0);
2549 gfc_free_symbol (sym);
2553 /* Allocate and initialize a new symbol node. */
2556 gfc_new_symbol (const char *name, gfc_namespace *ns)
2560 p = XCNEW (gfc_symbol);
2562 gfc_clear_ts (&p->ts);
2563 gfc_clear_attr (&p->attr);
2566 p->declared_at = gfc_current_locus;
2568 if (strlen (name) > GFC_MAX_SYMBOL_LEN)
2569 gfc_internal_error ("new_symbol(): Symbol name too long");
2571 p->name = gfc_get_string (name);
2573 /* Make sure flags for symbol being C bound are clear initially. */
2574 p->attr.is_bind_c = 0;
2575 p->attr.is_iso_c = 0;
2577 /* Clear the ptrs we may need. */
2578 p->common_block = NULL;
2579 p->f2k_derived = NULL;
2586 /* Generate an error if a symbol is ambiguous. */
2589 ambiguous_symbol (const char *name, gfc_symtree *st)
2592 if (st->n.sym->module)
2593 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2594 "from module '%s'", name, st->n.sym->name, st->n.sym->module);
2596 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2597 "from current program unit", name, st->n.sym->name);
2601 /* If we're in a SELECT TYPE block, check if the variable 'st' matches any
2602 selector on the stack. If yes, replace it by the corresponding temporary. */
2605 select_type_insert_tmp (gfc_symtree **st)
2607 gfc_select_type_stack *stack = select_type_stack;
2608 for (; stack; stack = stack->prev)
2609 if ((*st)->n.sym == stack->selector && stack->tmp)
2614 /* Look for a symtree in the current procedure -- that is, go up to
2615 parent namespaces but only if inside a BLOCK. Returns NULL if not found. */
2618 gfc_find_symtree_in_proc (const char* name, gfc_namespace* ns)
2622 gfc_symtree* st = gfc_find_symtree (ns->sym_root, name);
2626 if (!ns->construct_entities)
2635 /* Search for a symtree starting in the current namespace, resorting to
2636 any parent namespaces if requested by a nonzero parent_flag.
2637 Returns nonzero if the name is ambiguous. */
2640 gfc_find_sym_tree (const char *name, gfc_namespace *ns, int parent_flag,
2641 gfc_symtree **result)
2646 ns = gfc_current_ns;
2650 st = gfc_find_symtree (ns->sym_root, name);
2653 select_type_insert_tmp (&st);
2656 /* Ambiguous generic interfaces are permitted, as long
2657 as the specific interfaces are different. */
2658 if (st->ambiguous && !st->n.sym->attr.generic)
2660 ambiguous_symbol (name, st);
2679 /* Same, but returns the symbol instead. */
2682 gfc_find_symbol (const char *name, gfc_namespace *ns, int parent_flag,
2683 gfc_symbol **result)
2688 i = gfc_find_sym_tree (name, ns, parent_flag, &st);
2693 *result = st->n.sym;
2699 /* Save symbol with the information necessary to back it out. */
2702 save_symbol_data (gfc_symbol *sym)
2705 if (sym->gfc_new || sym->old_symbol != NULL)
2708 sym->old_symbol = XCNEW (gfc_symbol);
2709 *(sym->old_symbol) = *sym;
2711 sym->tlink = changed_syms;
2716 /* Given a name, find a symbol, or create it if it does not exist yet
2717 in the current namespace. If the symbol is found we make sure that
2720 The integer return code indicates
2722 1 The symbol name was ambiguous
2723 2 The name meant to be established was already host associated.
2725 So if the return value is nonzero, then an error was issued. */
2728 gfc_get_sym_tree (const char *name, gfc_namespace *ns, gfc_symtree **result,
2729 bool allow_subroutine)
2734 /* This doesn't usually happen during resolution. */
2736 ns = gfc_current_ns;
2738 /* Try to find the symbol in ns. */
2739 st = gfc_find_symtree (ns->sym_root, name);
2743 /* If not there, create a new symbol. */
2744 p = gfc_new_symbol (name, ns);
2746 /* Add to the list of tentative symbols. */
2747 p->old_symbol = NULL;
2748 p->tlink = changed_syms;
2753 st = gfc_new_symtree (&ns->sym_root, name);
2760 /* Make sure the existing symbol is OK. Ambiguous
2761 generic interfaces are permitted, as long as the
2762 specific interfaces are different. */
2763 if (st->ambiguous && !st->n.sym->attr.generic)
2765 ambiguous_symbol (name, st);
2770 if (p->ns != ns && (!p->attr.function || ns->proc_name != p)
2771 && !(allow_subroutine && p->attr.subroutine)
2772 && !(ns->proc_name && ns->proc_name->attr.if_source == IFSRC_IFBODY
2773 && (ns->has_import_set || p->attr.imported)))
2775 /* Symbol is from another namespace. */
2776 gfc_error ("Symbol '%s' at %C has already been host associated",
2783 /* Copy in case this symbol is changed. */
2784 save_symbol_data (p);
2793 gfc_get_symbol (const char *name, gfc_namespace *ns, gfc_symbol **result)
2798 i = gfc_get_sym_tree (name, ns, &st, false);
2803 *result = st->n.sym;
2810 /* Subroutine that searches for a symbol, creating it if it doesn't
2811 exist, but tries to host-associate the symbol if possible. */
2814 gfc_get_ha_sym_tree (const char *name, gfc_symtree **result)
2819 i = gfc_find_sym_tree (name, gfc_current_ns, 0, &st);
2823 save_symbol_data (st->n.sym);
2828 if (gfc_current_ns->parent != NULL)
2830 i = gfc_find_sym_tree (name, gfc_current_ns->parent, 1, &st);
2841 return gfc_get_sym_tree (name, gfc_current_ns, result, false);
2846 gfc_get_ha_symbol (const char *name, gfc_symbol **result)
2851 i = gfc_get_ha_sym_tree (name, &st);
2854 *result = st->n.sym;
2861 /* Undoes all the changes made to symbols in the current statement.
2862 This subroutine is made simpler due to the fact that attributes are
2863 never removed once added. */
2866 gfc_undo_symbols (void)
2868 gfc_symbol *p, *q, *old;
2869 tentative_tbp *tbp, *tbq;
2871 for (p = changed_syms; p; p = q)
2877 /* Symbol was new. */
2878 if (p->attr.in_common && p->common_block && p->common_block->head)
2880 /* If the symbol was added to any common block, it
2881 needs to be removed to stop the resolver looking
2882 for a (possibly) dead symbol. */
2884 if (p->common_block->head == p)
2885 p->common_block->head = p->common_next;
2888 gfc_symbol *cparent, *csym;
2890 cparent = p->common_block->head;
2891 csym = cparent->common_next;
2896 csym = csym->common_next;
2899 gcc_assert(cparent->common_next == p);
2901 cparent->common_next = csym->common_next;
2905 /* The derived type is saved in the symtree with the first
2906 letter capitalized; the all lower-case version to the
2907 derived type contains its associated generic function. */
2908 if (p->attr.flavor == FL_DERIVED)
2909 gfc_delete_symtree (&p->ns->sym_root, gfc_get_string ("%c%s",
2910 (char) TOUPPER ((unsigned char) p->name[0]),
2913 gfc_delete_symtree (&p->ns->sym_root, p->name);
2915 gfc_release_symbol (p);
2919 /* Restore previous state of symbol. Just copy simple stuff. */
2921 old = p->old_symbol;
2923 p->ts.type = old->ts.type;
2924 p->ts.kind = old->ts.kind;
2926 p->attr = old->attr;
2928 if (p->value != old->value)
2930 gfc_free_expr (old->value);
2934 if (p->as != old->as)
2937 gfc_free_array_spec (p->as);
2941 p->generic = old->generic;
2942 p->component_access = old->component_access;
2944 if (p->namelist != NULL && old->namelist == NULL)
2946 gfc_free_namelist (p->namelist);
2951 if (p->namelist_tail != old->namelist_tail)
2953 gfc_free_namelist (old->namelist_tail);
2954 old->namelist_tail->next = NULL;
2958 p->namelist_tail = old->namelist_tail;
2960 if (p->formal != old->formal)
2962 gfc_free_formal_arglist (p->formal);
2963 p->formal = old->formal;
2966 free (p->old_symbol);
2967 p->old_symbol = NULL;
2971 changed_syms = NULL;
2973 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
2976 /* Procedure is already marked `error' by default. */
2979 tentative_tbp_list = NULL;
2983 /* Free sym->old_symbol. sym->old_symbol is mostly a shallow copy of sym; the
2984 components of old_symbol that might need deallocation are the "allocatables"
2985 that are restored in gfc_undo_symbols(), with two exceptions: namelist and
2986 namelist_tail. In case these differ between old_symbol and sym, it's just
2987 because sym->namelist has gotten a few more items. */
2990 free_old_symbol (gfc_symbol *sym)
2993 if (sym->old_symbol == NULL)
2996 if (sym->old_symbol->as != sym->as)
2997 gfc_free_array_spec (sym->old_symbol->as);
2999 if (sym->old_symbol->value != sym->value)
3000 gfc_free_expr (sym->old_symbol->value);
3002 if (sym->old_symbol->formal != sym->formal)
3003 gfc_free_formal_arglist (sym->old_symbol->formal);
3005 free (sym->old_symbol);
3006 sym->old_symbol = NULL;
3010 /* Makes the changes made in the current statement permanent-- gets
3011 rid of undo information. */
3014 gfc_commit_symbols (void)
3017 tentative_tbp *tbp, *tbq;
3019 for (p = changed_syms; p; p = q)
3025 free_old_symbol (p);
3027 changed_syms = NULL;
3029 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
3032 tbp->proc->error = 0;
3035 tentative_tbp_list = NULL;
3039 /* Makes the changes made in one symbol permanent -- gets rid of undo
3043 gfc_commit_symbol (gfc_symbol *sym)
3047 if (changed_syms == sym)
3048 changed_syms = sym->tlink;
3051 for (p = changed_syms; p; p = p->tlink)
3052 if (p->tlink == sym)
3054 p->tlink = sym->tlink;
3063 free_old_symbol (sym);
3067 /* Recursively free trees containing type-bound procedures. */
3070 free_tb_tree (gfc_symtree *t)
3075 free_tb_tree (t->left);
3076 free_tb_tree (t->right);
3078 /* TODO: Free type-bound procedure structs themselves; probably needs some
3079 sort of ref-counting mechanism. */
3085 /* Recursive function that deletes an entire tree and all the common
3086 head structures it points to. */
3089 free_common_tree (gfc_symtree * common_tree)
3091 if (common_tree == NULL)
3094 free_common_tree (common_tree->left);
3095 free_common_tree (common_tree->right);
3101 /* Recursive function that deletes an entire tree and all the user
3102 operator nodes that it contains. */
3105 free_uop_tree (gfc_symtree *uop_tree)
3107 if (uop_tree == NULL)
3110 free_uop_tree (uop_tree->left);
3111 free_uop_tree (uop_tree->right);
3113 gfc_free_interface (uop_tree->n.uop->op);
3114 free (uop_tree->n.uop);
3119 /* Recursive function that deletes an entire tree and all the symbols
3120 that it contains. */
3123 free_sym_tree (gfc_symtree *sym_tree)
3125 if (sym_tree == NULL)
3128 free_sym_tree (sym_tree->left);
3129 free_sym_tree (sym_tree->right);
3131 gfc_release_symbol (sym_tree->n.sym);
3136 /* Free the derived type list. */
3139 gfc_free_dt_list (void)
3141 gfc_dt_list *dt, *n;
3143 for (dt = gfc_derived_types; dt; dt = n)
3149 gfc_derived_types = NULL;
3153 /* Free the gfc_equiv_info's. */
3156 gfc_free_equiv_infos (gfc_equiv_info *s)
3160 gfc_free_equiv_infos (s->next);
3165 /* Free the gfc_equiv_lists. */
3168 gfc_free_equiv_lists (gfc_equiv_list *l)
3172 gfc_free_equiv_lists (l->next);
3173 gfc_free_equiv_infos (l->equiv);
3178 /* Free a finalizer procedure list. */
3181 gfc_free_finalizer (gfc_finalizer* el)
3185 gfc_release_symbol (el->proc_sym);
3191 gfc_free_finalizer_list (gfc_finalizer* list)
3195 gfc_finalizer* current = list;
3197 gfc_free_finalizer (current);
3202 /* Create a new gfc_charlen structure and add it to a namespace.
3203 If 'old_cl' is given, the newly created charlen will be a copy of it. */
3206 gfc_new_charlen (gfc_namespace *ns, gfc_charlen *old_cl)
3209 cl = gfc_get_charlen ();
3214 /* Put into namespace, but don't allow reject_statement
3215 to free it if old_cl is given. */
3216 gfc_charlen **prev = &ns->cl_list;
3217 cl->next = ns->old_cl_list;
3218 while (*prev != ns->old_cl_list)
3219 prev = &(*prev)->next;
3221 ns->old_cl_list = cl;
3222 cl->length = gfc_copy_expr (old_cl->length);
3223 cl->length_from_typespec = old_cl->length_from_typespec;
3224 cl->backend_decl = old_cl->backend_decl;
3225 cl->passed_length = old_cl->passed_length;
3226 cl->resolved = old_cl->resolved;
3230 /* Put into namespace. */
3231 cl->next = ns->cl_list;
3239 /* Free the charlen list from cl to end (end is not freed).
3240 Free the whole list if end is NULL. */
3243 gfc_free_charlen (gfc_charlen *cl, gfc_charlen *end)
3247 for (; cl != end; cl = cl2)
3252 gfc_free_expr (cl->length);
3258 /* Free entry list structs. */
3261 free_entry_list (gfc_entry_list *el)
3263 gfc_entry_list *next;
3270 free_entry_list (next);
3274 /* Free a namespace structure and everything below it. Interface
3275 lists associated with intrinsic operators are not freed. These are
3276 taken care of when a specific name is freed. */
3279 gfc_free_namespace (gfc_namespace *ns)
3281 gfc_namespace *p, *q;
3290 gcc_assert (ns->refs == 0);
3292 gfc_free_statements (ns->code);
3294 free_sym_tree (ns->sym_root);
3295 free_uop_tree (ns->uop_root);
3296 free_common_tree (ns->common_root);
3297 free_tb_tree (ns->tb_sym_root);
3298 free_tb_tree (ns->tb_uop_root);
3299 gfc_free_finalizer_list (ns->finalizers);
3300 gfc_free_charlen (ns->cl_list, NULL);
3301 free_st_labels (ns->st_labels);
3303 free_entry_list (ns->entries);
3304 gfc_free_equiv (ns->equiv);
3305 gfc_free_equiv_lists (ns->equiv_lists);
3306 gfc_free_use_stmts (ns->use_stmts);
3308 for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++)
3309 gfc_free_interface (ns->op[i]);
3311 gfc_free_data (ns->data);
3315 /* Recursively free any contained namespaces. */
3320 gfc_free_namespace (q);
3326 gfc_symbol_init_2 (void)
3329 gfc_current_ns = gfc_get_namespace (NULL, 0);
3334 gfc_symbol_done_2 (void)
3337 gfc_free_namespace (gfc_current_ns);
3338 gfc_current_ns = NULL;
3339 gfc_free_dt_list ();
3343 /* Count how many nodes a symtree has. */
3346 count_st_nodes (const gfc_symtree *st)
3352 nodes = count_st_nodes (st->left);
3354 nodes += count_st_nodes (st->right);
3360 /* Convert symtree tree into symtree vector. */
3363 fill_st_vector (gfc_symtree *st, gfc_symtree **st_vec, unsigned node_cntr)
3368 node_cntr = fill_st_vector (st->left, st_vec, node_cntr);
3369 st_vec[node_cntr++] = st;
3370 node_cntr = fill_st_vector (st->right, st_vec, node_cntr);
3376 /* Traverse namespace. As the functions might modify the symtree, we store the
3377 symtree as a vector and operate on this vector. Note: We assume that
3378 sym_func or st_func never deletes nodes from the symtree - only adding is
3379 allowed. Additionally, newly added nodes are not traversed. */
3382 do_traverse_symtree (gfc_symtree *st, void (*st_func) (gfc_symtree *),
3383 void (*sym_func) (gfc_symbol *))
3385 gfc_symtree **st_vec;
3386 unsigned nodes, i, node_cntr;
3388 gcc_assert ((st_func && !sym_func) || (!st_func && sym_func));
3389 nodes = count_st_nodes (st);
3390 st_vec = XALLOCAVEC (gfc_symtree *, nodes);
3392 fill_st_vector (st, st_vec, node_cntr);
3397 for (i = 0; i < nodes; i++)
3398 st_vec[i]->n.sym->mark = 0;
3399 for (i = 0; i < nodes; i++)
3400 if (!st_vec[i]->n.sym->mark)
3402 (*sym_func) (st_vec[i]->n.sym);
3403 st_vec[i]->n.sym->mark = 1;
3407 for (i = 0; i < nodes; i++)
3408 (*st_func) (st_vec[i]);
3412 /* Recursively traverse the symtree nodes. */
3415 gfc_traverse_symtree (gfc_symtree *st, void (*st_func) (gfc_symtree *))
3417 do_traverse_symtree (st, st_func, NULL);
3421 /* Call a given function for all symbols in the namespace. We take
3422 care that each gfc_symbol node is called exactly once. */
3425 gfc_traverse_ns (gfc_namespace *ns, void (*sym_func) (gfc_symbol *))
3427 do_traverse_symtree (ns->sym_root, NULL, sym_func);
3431 /* Return TRUE when name is the name of an intrinsic type. */
3434 gfc_is_intrinsic_typename (const char *name)
3436 if (strcmp (name, "integer") == 0
3437 || strcmp (name, "real") == 0
3438 || strcmp (name, "character") == 0
3439 || strcmp (name, "logical") == 0
3440 || strcmp (name, "complex") == 0
3441 || strcmp (name, "doubleprecision") == 0
3442 || strcmp (name, "doublecomplex") == 0)
3449 /* Return TRUE if the symbol is an automatic variable. */
3452 gfc_is_var_automatic (gfc_symbol *sym)
3454 /* Pointer and allocatable variables are never automatic. */
3455 if (sym->attr.pointer || sym->attr.allocatable)
3457 /* Check for arrays with non-constant size. */
3458 if (sym->attr.dimension && sym->as
3459 && !gfc_is_compile_time_shape (sym->as))
3461 /* Check for non-constant length character variables. */
3462 if (sym->ts.type == BT_CHARACTER
3464 && !gfc_is_constant_expr (sym->ts.u.cl->length))
3469 /* Given a symbol, mark it as SAVEd if it is allowed. */
3472 save_symbol (gfc_symbol *sym)
3475 if (sym->attr.use_assoc)
3478 if (sym->attr.in_common
3481 || sym->attr.flavor != FL_VARIABLE)
3483 /* Automatic objects are not saved. */
3484 if (gfc_is_var_automatic (sym))
3486 gfc_add_save (&sym->attr, SAVE_EXPLICIT, sym->name, &sym->declared_at);
3490 /* Mark those symbols which can be SAVEd as such. */
3493 gfc_save_all (gfc_namespace *ns)
3495 gfc_traverse_ns (ns, save_symbol);
3499 /* Make sure that no changes to symbols are pending. */
3502 gfc_enforce_clean_symbol_state(void)
3504 gcc_assert (changed_syms == NULL);
3508 /************** Global symbol handling ************/
3511 /* Search a tree for the global symbol. */
3514 gfc_find_gsymbol (gfc_gsymbol *symbol, const char *name)
3523 c = strcmp (name, symbol->name);
3527 symbol = (c < 0) ? symbol->left : symbol->right;
3534 /* Compare two global symbols. Used for managing the BB tree. */
3537 gsym_compare (void *_s1, void *_s2)
3539 gfc_gsymbol *s1, *s2;
3541 s1 = (gfc_gsymbol *) _s1;
3542 s2 = (gfc_gsymbol *) _s2;
3543 return strcmp (s1->name, s2->name);
3547 /* Get a global symbol, creating it if it doesn't exist. */
3550 gfc_get_gsymbol (const char *name)
3554 s = gfc_find_gsymbol (gfc_gsym_root, name);
3558 s = XCNEW (gfc_gsymbol);
3559 s->type = GSYM_UNKNOWN;
3560 s->name = gfc_get_string (name);
3562 gfc_insert_bbt (&gfc_gsym_root, s, gsym_compare);
3569 get_iso_c_binding_dt (int sym_id)
3571 gfc_dt_list *dt_list;
3573 dt_list = gfc_derived_types;
3575 /* Loop through the derived types in the name list, searching for
3576 the desired symbol from iso_c_binding. Search the parent namespaces
3577 if necessary and requested to (parent_flag). */
3578 while (dt_list != NULL)
3580 if (dt_list->derived->from_intmod != INTMOD_NONE
3581 && dt_list->derived->intmod_sym_id == sym_id)
3582 return dt_list->derived;
3584 dt_list = dt_list->next;
3591 /* Verifies that the given derived type symbol, derived_sym, is interoperable
3592 with C. This is necessary for any derived type that is BIND(C) and for
3593 derived types that are parameters to functions that are BIND(C). All
3594 fields of the derived type are required to be interoperable, and are tested
3595 for such. If an error occurs, the errors are reported here, allowing for
3596 multiple errors to be handled for a single derived type. */
3599 verify_bind_c_derived_type (gfc_symbol *derived_sym)
3601 gfc_component *curr_comp = NULL;
3602 gfc_try is_c_interop = FAILURE;
3603 gfc_try retval = SUCCESS;
3605 if (derived_sym == NULL)
3606 gfc_internal_error ("verify_bind_c_derived_type(): Given symbol is "
3607 "unexpectedly NULL");
3609 /* If we've already looked at this derived symbol, do not look at it again
3610 so we don't repeat warnings/errors. */
3611 if (derived_sym->ts.is_c_interop)
3614 /* The derived type must have the BIND attribute to be interoperable
3615 J3/04-007, Section 15.2.3. */
3616 if (derived_sym->attr.is_bind_c != 1)
3618 derived_sym->ts.is_c_interop = 0;
3619 gfc_error_now ("Derived type '%s' declared at %L must have the BIND "
3620 "attribute to be C interoperable", derived_sym->name,
3621 &(derived_sym->declared_at));
3625 curr_comp = derived_sym->components;
3627 /* Fortran 2003 allows an empty derived type. C99 appears to disallow an
3628 empty struct. Section 15.2 in Fortran 2003 states: "The following
3629 subclauses define the conditions under which a Fortran entity is
3630 interoperable. If a Fortran entity is interoperable, an equivalent
3631 entity may be defined by means of C and the Fortran entity is said
3632 to be interoperable with the C entity. There does not have to be such
3633 an interoperating C entity."
3635 if (curr_comp == NULL)
3637 gfc_warning ("Derived type '%s' with BIND(C) attribute at %L is empty, "
3638 "and may be inaccessible by the C companion processor",
3639 derived_sym->name, &(derived_sym->declared_at));
3640 derived_sym->ts.is_c_interop = 1;
3641 derived_sym->attr.is_bind_c = 1;
3646 /* Initialize the derived type as being C interoperable.
3647 If we find an error in the components, this will be set false. */
3648 derived_sym->ts.is_c_interop = 1;
3650 /* Loop through the list of components to verify that the kind of
3651 each is a C interoperable type. */
3654 /* The components cannot be pointers (fortran sense).
3655 J3/04-007, Section 15.2.3, C1505. */
3656 if (curr_comp->attr.pointer != 0)
3658 gfc_error ("Component '%s' at %L cannot have the "
3659 "POINTER attribute because it is a member "
3660 "of the BIND(C) derived type '%s' at %L",
3661 curr_comp->name, &(curr_comp->loc),
3662 derived_sym->name, &(derived_sym->declared_at));
3666 if (curr_comp->attr.proc_pointer != 0)
3668 gfc_error ("Procedure pointer component '%s' at %L cannot be a member"
3669 " of the BIND(C) derived type '%s' at %L", curr_comp->name,
3670 &curr_comp->loc, derived_sym->name,
3671 &derived_sym->declared_at);
3675 /* The components cannot be allocatable.
3676 J3/04-007, Section 15.2.3, C1505. */
3677 if (curr_comp->attr.allocatable != 0)
3679 gfc_error ("Component '%s' at %L cannot have the "
3680 "ALLOCATABLE attribute because it is a member "
3681 "of the BIND(C) derived type '%s' at %L",
3682 curr_comp->name, &(curr_comp->loc),
3683 derived_sym->name, &(derived_sym->declared_at));
3687 /* BIND(C) derived types must have interoperable components. */
3688 if (curr_comp->ts.type == BT_DERIVED
3689 && curr_comp->ts.u.derived->ts.is_iso_c != 1
3690 && curr_comp->ts.u.derived != derived_sym)
3692 /* This should be allowed; the draft says a derived-type can not
3693 have type parameters if it is has the BIND attribute. Type
3694 parameters seem to be for making parameterized derived types.
3695 There's no need to verify the type if it is c_ptr/c_funptr. */
3696 retval = verify_bind_c_derived_type (curr_comp->ts.u.derived);
3700 /* Grab the typespec for the given component and test the kind. */
3701 is_c_interop = gfc_verify_c_interop (&(curr_comp->ts));
3703 if (is_c_interop != SUCCESS)
3705 /* Report warning and continue since not fatal. The
3706 draft does specify a constraint that requires all fields
3707 to interoperate, but if the user says real(4), etc., it
3708 may interoperate with *something* in C, but the compiler
3709 most likely won't know exactly what. Further, it may not
3710 interoperate with the same data type(s) in C if the user
3711 recompiles with different flags (e.g., -m32 and -m64 on
3712 x86_64 and using integer(4) to claim interop with a
3714 if (derived_sym->attr.is_bind_c == 1
3715 && gfc_option.warn_c_binding_type)
3716 /* If the derived type is bind(c), all fields must be
3718 gfc_warning ("Component '%s' in derived type '%s' at %L "
3719 "may not be C interoperable, even though "
3720 "derived type '%s' is BIND(C)",
3721 curr_comp->name, derived_sym->name,
3722 &(curr_comp->loc), derived_sym->name);
3723 else if (gfc_option.warn_c_binding_type)
3724 /* If derived type is param to bind(c) routine, or to one
3725 of the iso_c_binding procs, it must be interoperable, so
3726 all fields must interop too. */
3727 gfc_warning ("Component '%s' in derived type '%s' at %L "
3728 "may not be C interoperable",
3729 curr_comp->name, derived_sym->name,
3734 curr_comp = curr_comp->next;
3735 } while (curr_comp != NULL);
3738 /* Make sure we don't have conflicts with the attributes. */
3739 if (derived_sym->attr.access == ACCESS_PRIVATE)
3741 gfc_error ("Derived type '%s' at %L cannot be declared with both "
3742 "PRIVATE and BIND(C) attributes", derived_sym->name,
3743 &(derived_sym->declared_at));
3747 if (derived_sym->attr.sequence != 0)
3749 gfc_error ("Derived type '%s' at %L cannot have the SEQUENCE "
3750 "attribute because it is BIND(C)", derived_sym->name,
3751 &(derived_sym->declared_at));
3755 /* Mark the derived type as not being C interoperable if we found an
3756 error. If there were only warnings, proceed with the assumption
3757 it's interoperable. */
3758 if (retval == FAILURE)
3759 derived_sym->ts.is_c_interop = 0;
3765 /* Generate symbols for the named constants c_null_ptr and c_null_funptr. */
3768 gen_special_c_interop_ptr (int ptr_id, const char *ptr_name,
3769 const char *module_name)
3771 gfc_symtree *tmp_symtree;
3772 gfc_symbol *tmp_sym;
3775 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, ptr_name);
3777 if (tmp_symtree != NULL)
3778 tmp_sym = tmp_symtree->n.sym;
3782 gfc_internal_error ("gen_special_c_interop_ptr(): Unable to "
3783 "create symbol for %s", ptr_name);
3786 tmp_sym->ts.is_c_interop = 1;
3787 tmp_sym->attr.is_c_interop = 1;
3788 tmp_sym->ts.is_iso_c = 1;
3789 tmp_sym->ts.type = BT_DERIVED;
3790 tmp_sym->attr.flavor = FL_PARAMETER;
3792 /* The c_ptr and c_funptr derived types will provide the
3793 definition for c_null_ptr and c_null_funptr, respectively. */
3794 if (ptr_id == ISOCBINDING_NULL_PTR)
3795 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_PTR);
3797 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3798 if (tmp_sym->ts.u.derived == NULL)
3800 /* This can occur if the user forgot to declare c_ptr or
3801 c_funptr and they're trying to use one of the procedures
3802 that has arg(s) of the missing type. In this case, a
3803 regular version of the thing should have been put in the
3806 generate_isocbinding_symbol (module_name, ptr_id == ISOCBINDING_NULL_PTR
3807 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR,
3808 (const char *) (ptr_id == ISOCBINDING_NULL_PTR
3811 tmp_sym->ts.u.derived =
3812 get_iso_c_binding_dt (ptr_id == ISOCBINDING_NULL_PTR
3813 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR);
3816 /* Module name is some mangled version of iso_c_binding. */
3817 tmp_sym->module = gfc_get_string (module_name);
3819 /* Say it's from the iso_c_binding module. */
3820 tmp_sym->attr.is_iso_c = 1;
3822 tmp_sym->attr.use_assoc = 1;
3823 tmp_sym->attr.is_bind_c = 1;
3824 /* Since we never generate a call to this symbol, don't set the
3827 /* Set the c_address field of c_null_ptr and c_null_funptr to
3828 the value of NULL. */
3829 tmp_sym->value = gfc_get_expr ();
3830 tmp_sym->value->expr_type = EXPR_STRUCTURE;
3831 tmp_sym->value->ts.type = BT_DERIVED;
3832 tmp_sym->value->ts.u.derived = tmp_sym->ts.u.derived;
3833 gfc_constructor_append_expr (&tmp_sym->value->value.constructor, NULL, NULL);
3834 c = gfc_constructor_first (tmp_sym->value->value.constructor);
3835 c->expr = gfc_get_expr ();
3836 c->expr->expr_type = EXPR_NULL;
3837 c->expr->ts.is_iso_c = 1;
3843 /* Add a formal argument, gfc_formal_arglist, to the
3844 end of the given list of arguments. Set the reference to the
3845 provided symbol, param_sym, in the argument. */
3848 add_formal_arg (gfc_formal_arglist **head,
3849 gfc_formal_arglist **tail,
3850 gfc_formal_arglist *formal_arg,
3851 gfc_symbol *param_sym)
3853 /* Put in list, either as first arg or at the tail (curr arg). */
3855 *head = *tail = formal_arg;
3858 (*tail)->next = formal_arg;
3859 (*tail) = formal_arg;
3862 (*tail)->sym = param_sym;
3863 (*tail)->next = NULL;
3869 /* Generates a symbol representing the CPTR argument to an
3870 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3871 CPTR and add it to the provided argument list. */
3874 gen_cptr_param (gfc_formal_arglist **head,
3875 gfc_formal_arglist **tail,
3876 const char *module_name,
3877 gfc_namespace *ns, const char *c_ptr_name,
3880 gfc_symbol *param_sym = NULL;
3881 gfc_symbol *c_ptr_sym = NULL;
3882 gfc_symtree *param_symtree = NULL;
3883 gfc_formal_arglist *formal_arg = NULL;
3884 const char *c_ptr_in;
3885 const char *c_ptr_type = NULL;
3887 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3888 c_ptr_type = "c_funptr";
3890 c_ptr_type = "c_ptr";
3892 if(c_ptr_name == NULL)
3893 c_ptr_in = "gfc_cptr__";
3895 c_ptr_in = c_ptr_name;
3896 gfc_get_sym_tree (c_ptr_in, ns, ¶m_symtree, false);
3897 if (param_symtree != NULL)
3898 param_sym = param_symtree->n.sym;
3900 gfc_internal_error ("gen_cptr_param(): Unable to "
3901 "create symbol for %s", c_ptr_in);
3903 /* Set up the appropriate fields for the new c_ptr param sym. */
3905 param_sym->attr.flavor = FL_DERIVED;
3906 param_sym->ts.type = BT_DERIVED;
3907 param_sym->attr.intent = INTENT_IN;
3908 param_sym->attr.dummy = 1;
3910 /* This will pass the ptr to the iso_c routines as a (void *). */
3911 param_sym->attr.value = 1;
3912 param_sym->attr.use_assoc = 1;
3914 /* Get the symbol for c_ptr or c_funptr, no matter what it's name is
3916 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3917 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3919 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_PTR);
3920 if (c_ptr_sym == NULL)
3922 /* This can happen if the user did not define c_ptr but they are
3923 trying to use one of the iso_c_binding functions that need it. */
3924 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3925 generate_isocbinding_symbol (module_name, ISOCBINDING_FUNPTR,
3926 (const char *)c_ptr_type);
3928 generate_isocbinding_symbol (module_name, ISOCBINDING_PTR,
3929 (const char *)c_ptr_type);
3931 gfc_get_ha_symbol (c_ptr_type, &(c_ptr_sym));
3934 param_sym->ts.u.derived = c_ptr_sym;
3935 param_sym->module = gfc_get_string (module_name);
3937 /* Make new formal arg. */
3938 formal_arg = gfc_get_formal_arglist ();
3939 /* Add arg to list of formal args (the CPTR arg). */
3940 add_formal_arg (head, tail, formal_arg, param_sym);
3942 /* Validate changes. */
3943 gfc_commit_symbol (param_sym);
3947 /* Generates a symbol representing the FPTR argument to an
3948 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3949 FPTR and add it to the provided argument list. */
3952 gen_fptr_param (gfc_formal_arglist **head,
3953 gfc_formal_arglist **tail,
3954 const char *module_name,
3955 gfc_namespace *ns, const char *f_ptr_name, int proc)
3957 gfc_symbol *param_sym = NULL;
3958 gfc_symtree *param_symtree = NULL;
3959 gfc_formal_arglist *formal_arg = NULL;
3960 const char *f_ptr_out = "gfc_fptr__";
3962 if (f_ptr_name != NULL)
3963 f_ptr_out = f_ptr_name;
3965 gfc_get_sym_tree (f_ptr_out, ns, ¶m_symtree, false);
3966 if (param_symtree != NULL)
3967 param_sym = param_symtree->n.sym;
3969 gfc_internal_error ("generateFPtrParam(): Unable to "
3970 "create symbol for %s", f_ptr_out);
3972 /* Set up the necessary fields for the fptr output param sym. */
3975 param_sym->attr.proc_pointer = 1;
3977 param_sym->attr.pointer = 1;
3978 param_sym->attr.dummy = 1;
3979 param_sym->attr.use_assoc = 1;
3981 /* ISO C Binding type to allow any pointer type as actual param. */
3982 param_sym->ts.type = BT_VOID;
3983 param_sym->module = gfc_get_string (module_name);
3986 formal_arg = gfc_get_formal_arglist ();
3987 /* Add arg to list of formal args. */
3988 add_formal_arg (head, tail, formal_arg, param_sym);
3990 /* Validate changes. */
3991 gfc_commit_symbol (param_sym);
3995 /* Generates a symbol representing the optional SHAPE argument for the
3996 iso_c_binding c_f_pointer() procedure. Also, create a
3997 gfc_formal_arglist for the SHAPE and add it to the provided
4001 gen_shape_param (gfc_formal_arglist **head,
4002 gfc_formal_arglist **tail,
4003 const char *module_name,
4004 gfc_namespace *ns, const char *shape_param_name)
4006 gfc_symbol *param_sym = NULL;
4007 gfc_symtree *param_symtree = NULL;
4008 gfc_formal_arglist *formal_arg = NULL;
4009 const char *shape_param = "gfc_shape_array__";
4011 if (shape_param_name != NULL)
4012 shape_param = shape_param_name;
4014 gfc_get_sym_tree (shape_param, ns, ¶m_symtree, false);
4015 if (param_symtree != NULL)
4016 param_sym = param_symtree->n.sym;
4018 gfc_internal_error ("generateShapeParam(): Unable to "
4019 "create symbol for %s", shape_param);
4021 /* Set up the necessary fields for the shape input param sym. */
4023 param_sym->attr.dummy = 1;
4024 param_sym->attr.use_assoc = 1;
4026 /* Integer array, rank 1, describing the shape of the object. Make it's
4027 type BT_VOID initially so we can accept any type/kind combination of
4028 integer. During gfc_iso_c_sub_interface (resolve.c), we'll make it
4029 of BT_INTEGER type. */
4030 param_sym->ts.type = BT_VOID;
4032 /* Initialize the kind to default integer. However, it will be overridden
4033 during resolution to match the kind of the SHAPE parameter given as
4034 the actual argument (to allow for any valid integer kind). */
4035 param_sym->ts.kind = gfc_default_integer_kind;
4036 param_sym->as = gfc_get_array_spec ();
4038 param_sym->as->rank = 1;
4039 param_sym->as->lower[0] = gfc_get_int_expr (gfc_default_integer_kind,
4042 /* The extent is unknown until we get it. The length give us
4043 the rank the incoming pointer. */
4044 param_sym->as->type = AS_ASSUMED_SHAPE;
4046 /* The arg is also optional; it is required iff the second arg
4047 (fptr) is to an array, otherwise, it's ignored. */
4048 param_sym->attr.optional = 1;
4049 param_sym->attr.intent = INTENT_IN;
4050 param_sym->attr.dimension = 1;
4051 param_sym->module = gfc_get_string (module_name);
4054 formal_arg = gfc_get_formal_arglist ();
4055 /* Add arg to list of formal args. */
4056 add_formal_arg (head, tail, formal_arg, param_sym);
4058 /* Validate changes. */
4059 gfc_commit_symbol (param_sym);
4063 /* Add a procedure interface to the given symbol (i.e., store a
4064 reference to the list of formal arguments). */
4067 add_proc_interface (gfc_symbol *sym, ifsrc source, gfc_formal_arglist *formal)
4070 sym->formal = formal;
4071 sym->attr.if_source = source;
4075 /* Copy the formal args from an existing symbol, src, into a new
4076 symbol, dest. New formal args are created, and the description of
4077 each arg is set according to the existing ones. This function is
4078 used when creating procedure declaration variables from a procedure
4079 declaration statement (see match_proc_decl()) to create the formal
4080 args based on the args of a given named interface. */
4083 gfc_copy_formal_args (gfc_symbol *dest, gfc_symbol *src, ifsrc if_src)
4085 gfc_formal_arglist *head = NULL;
4086 gfc_formal_arglist *tail = NULL;
4087 gfc_formal_arglist *formal_arg = NULL;
4088 gfc_formal_arglist *curr_arg = NULL;
4089 gfc_formal_arglist *formal_prev = NULL;
4090 /* Save current namespace so we can change it for formal args. */
4091 gfc_namespace *parent_ns = gfc_current_ns;
4093 /* Create a new namespace, which will be the formal ns (namespace
4094 of the formal args). */
4095 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4096 gfc_current_ns->proc_name = dest;
4098 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4100 formal_arg = gfc_get_formal_arglist ();
4101 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4103 /* May need to copy more info for the symbol. */
4104 formal_arg->sym->attr = curr_arg->sym->attr;
4105 formal_arg->sym->ts = curr_arg->sym->ts;
4106 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4107 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym,
4108 curr_arg->sym->attr.if_source);
4110 /* If this isn't the first arg, set up the next ptr. For the
4111 last arg built, the formal_arg->next will never get set to
4112 anything other than NULL. */
4113 if (formal_prev != NULL)
4114 formal_prev->next = formal_arg;
4116 formal_arg->next = NULL;
4118 formal_prev = formal_arg;
4120 /* Add arg to list of formal args. */
4121 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4123 /* Validate changes. */
4124 gfc_commit_symbol (formal_arg->sym);
4127 /* Add the interface to the symbol. */
4128 add_proc_interface (dest, if_src, head);
4130 /* Store the formal namespace information. */
4131 if (dest->formal != NULL)
4132 /* The current ns should be that for the dest proc. */
4133 dest->formal_ns = gfc_current_ns;
4134 /* Restore the current namespace to what it was on entry. */
4135 gfc_current_ns = parent_ns;
4140 gfc_copy_formal_args_intr (gfc_symbol *dest, gfc_intrinsic_sym *src)
4142 gfc_formal_arglist *head = NULL;
4143 gfc_formal_arglist *tail = NULL;
4144 gfc_formal_arglist *formal_arg = NULL;
4145 gfc_intrinsic_arg *curr_arg = NULL;
4146 gfc_formal_arglist *formal_prev = NULL;
4147 /* Save current namespace so we can change it for formal args. */
4148 gfc_namespace *parent_ns = gfc_current_ns;
4150 /* Create a new namespace, which will be the formal ns (namespace
4151 of the formal args). */
4152 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4153 gfc_current_ns->proc_name = dest;
4155 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4157 formal_arg = gfc_get_formal_arglist ();
4158 gfc_get_symbol (curr_arg->name, gfc_current_ns, &(formal_arg->sym));
4160 /* May need to copy more info for the symbol. */
4161 formal_arg->sym->ts = curr_arg->ts;
4162 formal_arg->sym->attr.optional = curr_arg->optional;
4163 formal_arg->sym->attr.value = curr_arg->value;
4164 formal_arg->sym->attr.intent = curr_arg->intent;
4165 formal_arg->sym->attr.flavor = FL_VARIABLE;
4166 formal_arg->sym->attr.dummy = 1;
4168 if (formal_arg->sym->ts.type == BT_CHARACTER)
4169 formal_arg->sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4171 /* If this isn't the first arg, set up the next ptr. For the
4172 last arg built, the formal_arg->next will never get set to
4173 anything other than NULL. */
4174 if (formal_prev != NULL)
4175 formal_prev->next = formal_arg;
4177 formal_arg->next = NULL;
4179 formal_prev = formal_arg;
4181 /* Add arg to list of formal args. */
4182 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4184 /* Validate changes. */
4185 gfc_commit_symbol (formal_arg->sym);
4188 /* Add the interface to the symbol. */
4189 add_proc_interface (dest, IFSRC_DECL, head);
4191 /* Store the formal namespace information. */
4192 if (dest->formal != NULL)
4193 /* The current ns should be that for the dest proc. */
4194 dest->formal_ns = gfc_current_ns;
4195 /* Restore the current namespace to what it was on entry. */
4196 gfc_current_ns = parent_ns;
4201 gfc_copy_formal_args_ppc (gfc_component *dest, gfc_symbol *src, ifsrc if_src)
4203 gfc_formal_arglist *head = NULL;
4204 gfc_formal_arglist *tail = NULL;
4205 gfc_formal_arglist *formal_arg = NULL;
4206 gfc_formal_arglist *curr_arg = NULL;
4207 gfc_formal_arglist *formal_prev = NULL;
4208 /* Save current namespace so we can change it for formal args. */
4209 gfc_namespace *parent_ns = gfc_current_ns;
4211 /* Create a new namespace, which will be the formal ns (namespace
4212 of the formal args). */
4213 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4214 /* TODO: gfc_current_ns->proc_name = dest;*/
4216 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4218 formal_arg = gfc_get_formal_arglist ();
4219 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4221 /* May need to copy more info for the symbol. */
4222 formal_arg->sym->attr = curr_arg->sym->attr;
4223 formal_arg->sym->ts = curr_arg->sym->ts;
4224 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4225 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym,
4226 curr_arg->sym->attr.if_source);
4228 /* If this isn't the first arg, set up the next ptr. For the
4229 last arg built, the formal_arg->next will never get set to
4230 anything other than NULL. */
4231 if (formal_prev != NULL)
4232 formal_prev->next = formal_arg;
4234 formal_arg->next = NULL;
4236 formal_prev = formal_arg;
4238 /* Add arg to list of formal args. */
4239 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4241 /* Validate changes. */
4242 gfc_commit_symbol (formal_arg->sym);
4245 /* Add the interface to the symbol. */
4246 gfc_free_formal_arglist (dest->formal);
4247 dest->formal = head;
4248 dest->attr.if_source = if_src;
4250 /* Store the formal namespace information. */
4251 if (dest->formal != NULL)
4252 /* The current ns should be that for the dest proc. */
4253 dest->formal_ns = gfc_current_ns;
4254 /* Restore the current namespace to what it was on entry. */
4255 gfc_current_ns = parent_ns;
4259 /* Builds the parameter list for the iso_c_binding procedure
4260 c_f_pointer or c_f_procpointer. The old_sym typically refers to a
4261 generic version of either the c_f_pointer or c_f_procpointer
4262 functions. The new_proc_sym represents a "resolved" version of the
4263 symbol. The functions are resolved to match the types of their
4264 parameters; for example, c_f_pointer(cptr, fptr) would resolve to
4265 something similar to c_f_pointer_i4 if the type of data object fptr
4266 pointed to was a default integer. The actual name of the resolved
4267 procedure symbol is further mangled with the module name, etc., but
4268 the idea holds true. */
4271 build_formal_args (gfc_symbol *new_proc_sym,
4272 gfc_symbol *old_sym, int add_optional_arg)
4274 gfc_formal_arglist *head = NULL, *tail = NULL;
4275 gfc_namespace *parent_ns = NULL;
4277 parent_ns = gfc_current_ns;
4278 /* Create a new namespace, which will be the formal ns (namespace
4279 of the formal args). */
4280 gfc_current_ns = gfc_get_namespace(parent_ns, 0);
4281 gfc_current_ns->proc_name = new_proc_sym;
4283 /* Generate the params. */
4284 if (old_sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER)
4286 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4287 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4288 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4289 gfc_current_ns, "fptr", 1);
4291 else if (old_sym->intmod_sym_id == ISOCBINDING_F_POINTER)
4293 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4294 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4295 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4296 gfc_current_ns, "fptr", 0);
4297 /* If we're dealing with c_f_pointer, it has an optional third arg. */
4298 gen_shape_param (&head, &tail,(const char *) new_proc_sym->module,
4299 gfc_current_ns, "shape");
4302 else if (old_sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
4304 /* c_associated has one required arg and one optional; both
4306 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4307 gfc_current_ns, "c_ptr_1", ISOCBINDING_ASSOCIATED);
4308 if (add_optional_arg)
4310 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4311 gfc_current_ns, "c_ptr_2", ISOCBINDING_ASSOCIATED);
4312 /* The last param is optional so mark it as such. */
4313 tail->sym->attr.optional = 1;
4317 /* Add the interface (store formal args to new_proc_sym). */
4318 add_proc_interface (new_proc_sym, IFSRC_DECL, head);
4320 /* Set up the formal_ns pointer to the one created for the
4321 new procedure so it'll get cleaned up during gfc_free_symbol(). */
4322 new_proc_sym->formal_ns = gfc_current_ns;
4324 gfc_current_ns = parent_ns;
4328 std_for_isocbinding_symbol (int id)
4332 #define NAMED_INTCST(a,b,c,d) \
4335 #include "iso-c-binding.def"
4338 #define NAMED_FUNCTION(a,b,c,d) \
4341 #include "iso-c-binding.def"
4342 #undef NAMED_FUNCTION
4345 return GFC_STD_F2003;
4349 /* Generate the given set of C interoperable kind objects, or all
4350 interoperable kinds. This function will only be given kind objects
4351 for valid iso_c_binding defined types because this is verified when
4352 the 'use' statement is parsed. If the user gives an 'only' clause,
4353 the specific kinds are looked up; if they don't exist, an error is
4354 reported. If the user does not give an 'only' clause, all
4355 iso_c_binding symbols are generated. If a list of specific kinds
4356 is given, it must have a NULL in the first empty spot to mark the
4361 generate_isocbinding_symbol (const char *mod_name, iso_c_binding_symbol s,
4362 const char *local_name)
4364 const char *const name = (local_name && local_name[0]) ? local_name
4365 : c_interop_kinds_table[s].name;
4366 gfc_symtree *tmp_symtree = NULL;
4367 gfc_symbol *tmp_sym = NULL;
4370 if (gfc_notification_std (std_for_isocbinding_symbol (s)) == ERROR)
4373 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, name);
4375 /* Already exists in this scope so don't re-add it. */
4376 if (tmp_symtree != NULL && (tmp_sym = tmp_symtree->n.sym) != NULL
4377 && (!tmp_sym->attr.generic
4378 || (tmp_sym = gfc_find_dt_in_generic (tmp_sym)) != NULL)
4379 && tmp_sym->from_intmod == INTMOD_ISO_C_BINDING)
4381 if (tmp_sym->attr.flavor == FL_DERIVED
4382 && !get_iso_c_binding_dt (tmp_sym->intmod_sym_id))
4384 gfc_dt_list *dt_list;
4385 dt_list = gfc_get_dt_list ();
4386 dt_list->derived = tmp_sym;
4387 dt_list->next = gfc_derived_types;
4388 gfc_derived_types = dt_list;
4394 /* Create the sym tree in the current ns. */
4395 gfc_get_sym_tree (name, gfc_current_ns, &tmp_symtree, false);
4397 tmp_sym = tmp_symtree->n.sym;
4399 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4402 /* Say what module this symbol belongs to. */
4403 tmp_sym->module = gfc_get_string (mod_name);
4404 tmp_sym->from_intmod = INTMOD_ISO_C_BINDING;
4405 tmp_sym->intmod_sym_id = s;
4410 #define NAMED_INTCST(a,b,c,d) case a :
4411 #define NAMED_REALCST(a,b,c,d) case a :
4412 #define NAMED_CMPXCST(a,b,c,d) case a :
4413 #define NAMED_LOGCST(a,b,c) case a :
4414 #define NAMED_CHARKNDCST(a,b,c) case a :
4415 #include "iso-c-binding.def"
4417 tmp_sym->value = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4418 c_interop_kinds_table[s].value);
4420 /* Initialize an integer constant expression node. */
4421 tmp_sym->attr.flavor = FL_PARAMETER;
4422 tmp_sym->ts.type = BT_INTEGER;
4423 tmp_sym->ts.kind = gfc_default_integer_kind;
4425 /* Mark this type as a C interoperable one. */
4426 tmp_sym->ts.is_c_interop = 1;
4427 tmp_sym->ts.is_iso_c = 1;
4428 tmp_sym->value->ts.is_c_interop = 1;
4429 tmp_sym->value->ts.is_iso_c = 1;
4430 tmp_sym->attr.is_c_interop = 1;
4432 /* Tell what f90 type this c interop kind is valid. */
4433 tmp_sym->ts.f90_type = c_interop_kinds_table[s].f90_type;
4435 /* Say it's from the iso_c_binding module. */
4436 tmp_sym->attr.is_iso_c = 1;
4438 /* Make it use associated. */
4439 tmp_sym->attr.use_assoc = 1;
4443 #define NAMED_CHARCST(a,b,c) case a :
4444 #include "iso-c-binding.def"
4446 /* Initialize an integer constant expression node for the
4447 length of the character. */
4448 tmp_sym->value = gfc_get_character_expr (gfc_default_character_kind,
4449 &gfc_current_locus, NULL, 1);
4450 tmp_sym->value->ts.is_c_interop = 1;
4451 tmp_sym->value->ts.is_iso_c = 1;
4452 tmp_sym->value->value.character.length = 1;
4453 tmp_sym->value->value.character.string[0]
4454 = (gfc_char_t) c_interop_kinds_table[s].value;
4455 tmp_sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4456 tmp_sym->ts.u.cl->length = gfc_get_int_expr (gfc_default_integer_kind,
4459 /* May not need this in both attr and ts, but do need in
4460 attr for writing module file. */
4461 tmp_sym->attr.is_c_interop = 1;
4463 tmp_sym->attr.flavor = FL_PARAMETER;
4464 tmp_sym->ts.type = BT_CHARACTER;
4466 /* Need to set it to the C_CHAR kind. */
4467 tmp_sym->ts.kind = gfc_default_character_kind;
4469 /* Mark this type as a C interoperable one. */
4470 tmp_sym->ts.is_c_interop = 1;
4471 tmp_sym->ts.is_iso_c = 1;
4473 /* Tell what f90 type this c interop kind is valid. */
4474 tmp_sym->ts.f90_type = BT_CHARACTER;
4476 /* Say it's from the iso_c_binding module. */
4477 tmp_sym->attr.is_iso_c = 1;
4479 /* Make it use associated. */
4480 tmp_sym->attr.use_assoc = 1;
4483 case ISOCBINDING_PTR:
4484 case ISOCBINDING_FUNPTR:
4486 gfc_interface *intr, *head;
4488 const char *hidden_name;
4489 gfc_dt_list **dt_list_ptr = NULL;
4490 gfc_component *tmp_comp = NULL;
4491 char comp_name[(GFC_MAX_SYMBOL_LEN * 2) + 1];
4493 hidden_name = gfc_get_string ("%c%s",
4494 (char) TOUPPER ((unsigned char) tmp_sym->name[0]),
4497 /* Generate real derived type. */
4498 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
4501 if (tmp_symtree != NULL)
4503 gfc_get_sym_tree (hidden_name, gfc_current_ns, &tmp_symtree, false);
4505 dt_sym = tmp_symtree->n.sym;
4509 /* Generate an artificial generic function. */
4510 dt_sym->name = gfc_get_string (tmp_sym->name);
4511 head = tmp_sym->generic;
4512 intr = gfc_get_interface ();
4514 intr->where = gfc_current_locus;
4516 tmp_sym->generic = intr;
4518 if (!tmp_sym->attr.generic
4519 && gfc_add_generic (&tmp_sym->attr, tmp_sym->name, NULL)
4523 if (!tmp_sym->attr.function
4524 && gfc_add_function (&tmp_sym->attr, tmp_sym->name, NULL)
4528 /* Say what module this symbol belongs to. */
4529 dt_sym->module = gfc_get_string (mod_name);
4530 dt_sym->from_intmod = INTMOD_ISO_C_BINDING;
4531 dt_sym->intmod_sym_id = s;
4533 /* Initialize an integer constant expression node. */
4534 dt_sym->attr.flavor = FL_DERIVED;
4535 dt_sym->ts.is_c_interop = 1;
4536 dt_sym->attr.is_c_interop = 1;
4537 dt_sym->attr.is_iso_c = 1;
4538 dt_sym->ts.is_iso_c = 1;
4539 dt_sym->ts.type = BT_DERIVED;
4541 /* A derived type must have the bind attribute to be
4542 interoperable (J3/04-007, Section 15.2.3), even though
4543 the binding label is not used. */
4544 dt_sym->attr.is_bind_c = 1;
4546 dt_sym->attr.referenced = 1;
4547 dt_sym->ts.u.derived = dt_sym;
4549 /* Add the symbol created for the derived type to the current ns. */
4550 dt_list_ptr = &(gfc_derived_types);
4551 while (*dt_list_ptr != NULL && (*dt_list_ptr)->next != NULL)
4552 dt_list_ptr = &((*dt_list_ptr)->next);
4554 /* There is already at least one derived type in the list, so append
4555 the one we're currently building for c_ptr or c_funptr. */
4556 if (*dt_list_ptr != NULL)
4557 dt_list_ptr = &((*dt_list_ptr)->next);
4558 (*dt_list_ptr) = gfc_get_dt_list ();
4559 (*dt_list_ptr)->derived = dt_sym;
4560 (*dt_list_ptr)->next = NULL;
4562 /* Set up the component of the derived type, which will be
4563 an integer with kind equal to c_ptr_size. Mangle the name of
4564 the field for the c_address to prevent the curious user from
4565 trying to access it from Fortran. */
4566 sprintf (comp_name, "__%s_%s", dt_sym->name, "c_address");
4567 gfc_add_component (dt_sym, comp_name, &tmp_comp);
4568 if (tmp_comp == NULL)
4569 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4570 "create component for c_address");
4572 tmp_comp->ts.type = BT_INTEGER;
4574 /* Set this because the module will need to read/write this field. */
4575 tmp_comp->ts.f90_type = BT_INTEGER;
4577 /* The kinds for c_ptr and c_funptr are the same. */
4578 index = get_c_kind ("c_ptr", c_interop_kinds_table);
4579 tmp_comp->ts.kind = c_interop_kinds_table[index].value;
4581 tmp_comp->attr.pointer = 0;
4582 tmp_comp->attr.dimension = 0;
4584 /* Mark the component as C interoperable. */
4585 tmp_comp->ts.is_c_interop = 1;
4587 /* Make it use associated (iso_c_binding module). */
4588 dt_sym->attr.use_assoc = 1;
4593 case ISOCBINDING_NULL_PTR:
4594 case ISOCBINDING_NULL_FUNPTR:
4595 gen_special_c_interop_ptr (s, name, mod_name);
4598 case ISOCBINDING_F_POINTER:
4599 case ISOCBINDING_ASSOCIATED:
4600 case ISOCBINDING_LOC:
4601 case ISOCBINDING_FUNLOC:
4602 case ISOCBINDING_F_PROCPOINTER:
4604 tmp_sym->attr.proc = PROC_MODULE;
4606 /* Use the procedure's name as it is in the iso_c_binding module for
4607 setting the binding label in case the user renamed the symbol. */
4608 tmp_sym->binding_label =
4609 gfc_get_string ("%s_%s", mod_name,
4610 c_interop_kinds_table[s].name);
4611 tmp_sym->attr.is_iso_c = 1;
4612 if (s == ISOCBINDING_F_POINTER || s == ISOCBINDING_F_PROCPOINTER)
4613 tmp_sym->attr.subroutine = 1;
4616 /* TODO! This needs to be finished more for the expr of the
4617 function or something!
4618 This may not need to be here, because trying to do c_loc
4620 if (s == ISOCBINDING_ASSOCIATED)
4622 tmp_sym->attr.function = 1;
4623 tmp_sym->ts.type = BT_LOGICAL;
4624 tmp_sym->ts.kind = gfc_default_logical_kind;
4625 tmp_sym->result = tmp_sym;
4629 /* Here, we're taking the simple approach. We're defining
4630 c_loc as an external identifier so the compiler will put
4631 what we expect on the stack for the address we want the
4633 tmp_sym->ts.type = BT_DERIVED;
4634 if (s == ISOCBINDING_LOC)
4635 tmp_sym->ts.u.derived =
4636 get_iso_c_binding_dt (ISOCBINDING_PTR);
4638 tmp_sym->ts.u.derived =
4639 get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
4641 if (tmp_sym->ts.u.derived == NULL)
4643 /* Create the necessary derived type so we can continue
4644 processing the file. */
4645 generate_isocbinding_symbol
4646 (mod_name, s == ISOCBINDING_FUNLOC
4647 ? ISOCBINDING_FUNPTR : ISOCBINDING_PTR,
4648 (const char *)(s == ISOCBINDING_FUNLOC
4649 ? "c_funptr" : "c_ptr"));
4650 tmp_sym->ts.u.derived =
4651 get_iso_c_binding_dt (s == ISOCBINDING_FUNLOC
4652 ? ISOCBINDING_FUNPTR
4656 /* The function result is itself (no result clause). */
4657 tmp_sym->result = tmp_sym;
4658 tmp_sym->attr.external = 1;
4659 tmp_sym->attr.use_assoc = 0;
4660 tmp_sym->attr.pure = 1;
4661 tmp_sym->attr.if_source = IFSRC_UNKNOWN;
4662 tmp_sym->attr.proc = PROC_UNKNOWN;
4666 tmp_sym->attr.flavor = FL_PROCEDURE;
4667 tmp_sym->attr.contained = 0;
4669 /* Try using this builder routine, with the new and old symbols
4670 both being the generic iso_c proc sym being created. This
4671 will create the formal args (and the new namespace for them).
4672 Don't build an arg list for c_loc because we're going to treat
4673 c_loc as an external procedure. */
4674 if (s != ISOCBINDING_LOC && s != ISOCBINDING_FUNLOC)
4675 /* The 1 says to add any optional args, if applicable. */
4676 build_formal_args (tmp_sym, tmp_sym, 1);
4678 /* Set this after setting up the symbol, to prevent error messages. */
4679 tmp_sym->attr.use_assoc = 1;
4681 /* This symbol will not be referenced directly. It will be
4682 resolved to the implementation for the given f90 kind. */
4683 tmp_sym->attr.referenced = 0;
4690 gfc_commit_symbol (tmp_sym);
4694 /* Creates a new symbol based off of an old iso_c symbol, with a new
4695 binding label. This function can be used to create a new,
4696 resolved, version of a procedure symbol for c_f_pointer or
4697 c_f_procpointer that is based on the generic symbols. A new
4698 parameter list is created for the new symbol using
4699 build_formal_args(). The add_optional_flag specifies whether the
4700 to add the optional SHAPE argument. The new symbol is
4704 get_iso_c_sym (gfc_symbol *old_sym, char *new_name,
4705 const char *new_binding_label, int add_optional_arg)
4707 gfc_symtree *new_symtree = NULL;
4709 /* See if we have a symbol by that name already available, looking
4710 through any parent namespaces. */
4711 gfc_find_sym_tree (new_name, gfc_current_ns, 1, &new_symtree);
4712 if (new_symtree != NULL)
4713 /* Return the existing symbol. */
4714 return new_symtree->n.sym;
4716 /* Create the symtree/symbol, with attempted host association. */
4717 gfc_get_ha_sym_tree (new_name, &new_symtree);
4718 if (new_symtree == NULL)
4719 gfc_internal_error ("get_iso_c_sym(): Unable to create "
4720 "symtree for '%s'", new_name);
4722 /* Now fill in the fields of the resolved symbol with the old sym. */
4723 new_symtree->n.sym->binding_label = new_binding_label;
4724 new_symtree->n.sym->attr = old_sym->attr;
4725 new_symtree->n.sym->ts = old_sym->ts;
4726 new_symtree->n.sym->module = gfc_get_string (old_sym->module);
4727 new_symtree->n.sym->from_intmod = old_sym->from_intmod;
4728 new_symtree->n.sym->intmod_sym_id = old_sym->intmod_sym_id;
4729 if (old_sym->attr.function)
4730 new_symtree->n.sym->result = new_symtree->n.sym;
4731 /* Build the formal arg list. */
4732 build_formal_args (new_symtree->n.sym, old_sym, add_optional_arg);
4734 gfc_commit_symbol (new_symtree->n.sym);
4736 return new_symtree->n.sym;
4740 /* Check that a symbol is already typed. If strict is not set, an untyped
4741 symbol is acceptable for non-standard-conforming mode. */
4744 gfc_check_symbol_typed (gfc_symbol* sym, gfc_namespace* ns,
4745 bool strict, locus where)
4749 if (gfc_matching_prefix)
4752 /* Check for the type and try to give it an implicit one. */
4753 if (sym->ts.type == BT_UNKNOWN
4754 && gfc_set_default_type (sym, 0, ns) == FAILURE)
4758 gfc_error ("Symbol '%s' is used before it is typed at %L",
4763 if (gfc_notify_std (GFC_STD_GNU,
4764 "Symbol '%s' is used before"
4765 " it is typed at %L", sym->name, &where) == FAILURE)
4769 /* Everything is ok. */
4774 /* Construct a typebound-procedure structure. Those are stored in a tentative
4775 list and marked `error' until symbols are committed. */
4778 gfc_get_typebound_proc (gfc_typebound_proc *tb0)
4780 gfc_typebound_proc *result;
4781 tentative_tbp *list_node;
4783 result = XCNEW (gfc_typebound_proc);
4788 list_node = XCNEW (tentative_tbp);
4789 list_node->next = tentative_tbp_list;
4790 list_node->proc = result;
4791 tentative_tbp_list = list_node;
4797 /* Get the super-type of a given derived type. */
4800 gfc_get_derived_super_type (gfc_symbol* derived)
4802 if (derived && derived->attr.generic)
4803 derived = gfc_find_dt_in_generic (derived);
4805 if (!derived->attr.extension)
4808 gcc_assert (derived->components);
4809 gcc_assert (derived->components->ts.type == BT_DERIVED);
4810 gcc_assert (derived->components->ts.u.derived);
4812 if (derived->components->ts.u.derived->attr.generic)
4813 return gfc_find_dt_in_generic (derived->components->ts.u.derived);
4815 return derived->components->ts.u.derived;
4819 /* Get the ultimate super-type of a given derived type. */
4822 gfc_get_ultimate_derived_super_type (gfc_symbol* derived)
4824 if (!derived->attr.extension)
4827 derived = gfc_get_derived_super_type (derived);
4829 if (derived->attr.extension)
4830 return gfc_get_ultimate_derived_super_type (derived);
4836 /* Check if a derived type t2 is an extension of (or equal to) a type t1. */
4839 gfc_type_is_extension_of (gfc_symbol *t1, gfc_symbol *t2)
4841 while (!gfc_compare_derived_types (t1, t2) && t2->attr.extension)
4842 t2 = gfc_get_derived_super_type (t2);
4843 return gfc_compare_derived_types (t1, t2);
4847 /* Check if two typespecs are type compatible (F03:5.1.1.2):
4848 If ts1 is nonpolymorphic, ts2 must be the same type.
4849 If ts1 is polymorphic (CLASS), ts2 must be an extension of ts1. */
4852 gfc_type_compatible (gfc_typespec *ts1, gfc_typespec *ts2)
4854 bool is_class1 = (ts1->type == BT_CLASS);
4855 bool is_class2 = (ts2->type == BT_CLASS);
4856 bool is_derived1 = (ts1->type == BT_DERIVED);
4857 bool is_derived2 = (ts2->type == BT_DERIVED);
4859 if (!is_derived1 && !is_derived2 && !is_class1 && !is_class2)
4860 return (ts1->type == ts2->type);
4862 if (is_derived1 && is_derived2)
4863 return gfc_compare_derived_types (ts1->u.derived, ts2->u.derived);
4865 if (is_class1 && is_derived2)
4866 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4868 else if (is_class1 && is_class2)
4869 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4870 ts2->u.derived->components->ts.u.derived);
4876 /* Find the parent-namespace of the current function. If we're inside
4877 BLOCK constructs, it may not be the current one. */
4880 gfc_find_proc_namespace (gfc_namespace* ns)
4882 while (ns->construct_entities)
4892 /* Check if an associate-variable should be translated as an `implicit' pointer
4893 internally (if it is associated to a variable and not an array with
4897 gfc_is_associate_pointer (gfc_symbol* sym)
4902 if (sym->ts.type == BT_CLASS)
4905 if (!sym->assoc->variable)
4908 if (sym->attr.dimension && sym->as->type != AS_EXPLICIT)
4916 gfc_find_dt_in_generic (gfc_symbol *sym)
4918 gfc_interface *intr = NULL;
4920 if (!sym || sym->attr.flavor == FL_DERIVED)
4923 if (sym->attr.generic)
4924 for (intr = (sym ? sym->generic : NULL); intr; intr = intr->next)
4925 if (intr->sym->attr.flavor == FL_DERIVED)
4927 return intr ? intr->sym : NULL;