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 if (sym->ns != sym->formal_ns)
2515 gfc_free_namespace (sym->formal_ns);
2517 if (!sym->attr.generic_copy)
2518 gfc_free_interface (sym->generic);
2520 gfc_free_formal_arglist (sym->formal);
2522 gfc_free_namespace (sym->f2k_derived);
2524 if (sym->common_block && sym->common_block->name[0] != '\0')
2526 sym->common_block->refs--;
2527 if (sym->common_block->refs == 0)
2528 free (sym->common_block);
2535 /* Decrease the reference counter and free memory when we reach zero. */
2538 gfc_release_symbol (gfc_symbol *sym)
2543 if (sym->formal_ns != NULL && sym->refs == 2 && sym->formal_ns != sym->ns
2544 && (!sym->attr.entry || !sym->module))
2546 /* As formal_ns contains a reference to sym, delete formal_ns just
2547 before the deletion of sym. */
2548 gfc_namespace *ns = sym->formal_ns;
2549 sym->formal_ns = NULL;
2550 gfc_free_namespace (ns);
2557 gcc_assert (sym->refs == 0);
2558 gfc_free_symbol (sym);
2562 /* Allocate and initialize a new symbol node. */
2565 gfc_new_symbol (const char *name, gfc_namespace *ns)
2569 p = XCNEW (gfc_symbol);
2571 gfc_clear_ts (&p->ts);
2572 gfc_clear_attr (&p->attr);
2575 p->declared_at = gfc_current_locus;
2577 if (strlen (name) > GFC_MAX_SYMBOL_LEN)
2578 gfc_internal_error ("new_symbol(): Symbol name too long");
2580 p->name = gfc_get_string (name);
2582 /* Make sure flags for symbol being C bound are clear initially. */
2583 p->attr.is_bind_c = 0;
2584 p->attr.is_iso_c = 0;
2586 /* Clear the ptrs we may need. */
2587 p->common_block = NULL;
2588 p->f2k_derived = NULL;
2595 /* Generate an error if a symbol is ambiguous. */
2598 ambiguous_symbol (const char *name, gfc_symtree *st)
2601 if (st->n.sym->module)
2602 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2603 "from module '%s'", name, st->n.sym->name, st->n.sym->module);
2605 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2606 "from current program unit", name, st->n.sym->name);
2610 /* If we're in a SELECT TYPE block, check if the variable 'st' matches any
2611 selector on the stack. If yes, replace it by the corresponding temporary. */
2614 select_type_insert_tmp (gfc_symtree **st)
2616 gfc_select_type_stack *stack = select_type_stack;
2617 for (; stack; stack = stack->prev)
2618 if ((*st)->n.sym == stack->selector && stack->tmp)
2623 /* Look for a symtree in the current procedure -- that is, go up to
2624 parent namespaces but only if inside a BLOCK. Returns NULL if not found. */
2627 gfc_find_symtree_in_proc (const char* name, gfc_namespace* ns)
2631 gfc_symtree* st = gfc_find_symtree (ns->sym_root, name);
2635 if (!ns->construct_entities)
2644 /* Search for a symtree starting in the current namespace, resorting to
2645 any parent namespaces if requested by a nonzero parent_flag.
2646 Returns nonzero if the name is ambiguous. */
2649 gfc_find_sym_tree (const char *name, gfc_namespace *ns, int parent_flag,
2650 gfc_symtree **result)
2655 ns = gfc_current_ns;
2659 st = gfc_find_symtree (ns->sym_root, name);
2662 select_type_insert_tmp (&st);
2665 /* Ambiguous generic interfaces are permitted, as long
2666 as the specific interfaces are different. */
2667 if (st->ambiguous && !st->n.sym->attr.generic)
2669 ambiguous_symbol (name, st);
2688 /* Same, but returns the symbol instead. */
2691 gfc_find_symbol (const char *name, gfc_namespace *ns, int parent_flag,
2692 gfc_symbol **result)
2697 i = gfc_find_sym_tree (name, ns, parent_flag, &st);
2702 *result = st->n.sym;
2708 /* Save symbol with the information necessary to back it out. */
2711 save_symbol_data (gfc_symbol *sym)
2714 if (sym->gfc_new || sym->old_symbol != NULL)
2717 sym->old_symbol = XCNEW (gfc_symbol);
2718 *(sym->old_symbol) = *sym;
2720 sym->tlink = changed_syms;
2725 /* Given a name, find a symbol, or create it if it does not exist yet
2726 in the current namespace. If the symbol is found we make sure that
2729 The integer return code indicates
2731 1 The symbol name was ambiguous
2732 2 The name meant to be established was already host associated.
2734 So if the return value is nonzero, then an error was issued. */
2737 gfc_get_sym_tree (const char *name, gfc_namespace *ns, gfc_symtree **result,
2738 bool allow_subroutine)
2743 /* This doesn't usually happen during resolution. */
2745 ns = gfc_current_ns;
2747 /* Try to find the symbol in ns. */
2748 st = gfc_find_symtree (ns->sym_root, name);
2752 /* If not there, create a new symbol. */
2753 p = gfc_new_symbol (name, ns);
2755 /* Add to the list of tentative symbols. */
2756 p->old_symbol = NULL;
2757 p->tlink = changed_syms;
2762 st = gfc_new_symtree (&ns->sym_root, name);
2769 /* Make sure the existing symbol is OK. Ambiguous
2770 generic interfaces are permitted, as long as the
2771 specific interfaces are different. */
2772 if (st->ambiguous && !st->n.sym->attr.generic)
2774 ambiguous_symbol (name, st);
2779 if (p->ns != ns && (!p->attr.function || ns->proc_name != p)
2780 && !(allow_subroutine && p->attr.subroutine)
2781 && !(ns->proc_name && ns->proc_name->attr.if_source == IFSRC_IFBODY
2782 && (ns->has_import_set || p->attr.imported)))
2784 /* Symbol is from another namespace. */
2785 gfc_error ("Symbol '%s' at %C has already been host associated",
2792 /* Copy in case this symbol is changed. */
2793 save_symbol_data (p);
2802 gfc_get_symbol (const char *name, gfc_namespace *ns, gfc_symbol **result)
2807 i = gfc_get_sym_tree (name, ns, &st, false);
2812 *result = st->n.sym;
2819 /* Subroutine that searches for a symbol, creating it if it doesn't
2820 exist, but tries to host-associate the symbol if possible. */
2823 gfc_get_ha_sym_tree (const char *name, gfc_symtree **result)
2828 i = gfc_find_sym_tree (name, gfc_current_ns, 0, &st);
2832 save_symbol_data (st->n.sym);
2837 if (gfc_current_ns->parent != NULL)
2839 i = gfc_find_sym_tree (name, gfc_current_ns->parent, 1, &st);
2850 return gfc_get_sym_tree (name, gfc_current_ns, result, false);
2855 gfc_get_ha_symbol (const char *name, gfc_symbol **result)
2860 i = gfc_get_ha_sym_tree (name, &st);
2863 *result = st->n.sym;
2871 /* Search for the symtree belonging to a gfc_common_head; we cannot use
2872 head->name as the common_root symtree's name might be mangled. */
2874 static gfc_symtree *
2875 find_common_symtree (gfc_symtree *st, gfc_common_head *head)
2878 gfc_symtree *result;
2883 if (st->n.common == head)
2886 result = find_common_symtree (st->left, head);
2888 result = find_common_symtree (st->right, head);
2894 /* Undoes all the changes made to symbols in the current statement.
2895 This subroutine is made simpler due to the fact that attributes are
2896 never removed once added. */
2899 gfc_undo_symbols (void)
2901 gfc_symbol *p, *q, *old;
2902 tentative_tbp *tbp, *tbq;
2904 for (p = changed_syms; p; p = q)
2910 /* Symbol was new. */
2911 if (p->attr.in_common && p->common_block && p->common_block->head)
2913 /* If the symbol was added to any common block, it
2914 needs to be removed to stop the resolver looking
2915 for a (possibly) dead symbol. */
2917 if (p->common_block->head == p && !p->common_next)
2919 gfc_symtree st, *st0;
2920 st0 = find_common_symtree (p->ns->common_root,
2924 st.name = st0->name;
2925 gfc_delete_bbt (&p->ns->common_root, &st, compare_symtree);
2930 if (p->common_block->head == p)
2931 p->common_block->head = p->common_next;
2934 gfc_symbol *cparent, *csym;
2936 cparent = p->common_block->head;
2937 csym = cparent->common_next;
2942 csym = csym->common_next;
2945 gcc_assert(cparent->common_next == p);
2947 cparent->common_next = csym->common_next;
2951 /* The derived type is saved in the symtree with the first
2952 letter capitalized; the all lower-case version to the
2953 derived type contains its associated generic function. */
2954 if (p->attr.flavor == FL_DERIVED)
2955 gfc_delete_symtree (&p->ns->sym_root, gfc_get_string ("%c%s",
2956 (char) TOUPPER ((unsigned char) p->name[0]),
2959 gfc_delete_symtree (&p->ns->sym_root, p->name);
2961 gfc_release_symbol (p);
2965 /* Restore previous state of symbol. Just copy simple stuff. */
2967 old = p->old_symbol;
2969 p->ts.type = old->ts.type;
2970 p->ts.kind = old->ts.kind;
2972 p->attr = old->attr;
2974 if (p->value != old->value)
2976 gfc_free_expr (old->value);
2980 if (p->as != old->as)
2983 gfc_free_array_spec (p->as);
2987 p->generic = old->generic;
2988 p->component_access = old->component_access;
2990 if (p->namelist != NULL && old->namelist == NULL)
2992 gfc_free_namelist (p->namelist);
2997 if (p->namelist_tail != old->namelist_tail)
2999 gfc_free_namelist (old->namelist_tail);
3000 old->namelist_tail->next = NULL;
3004 p->namelist_tail = old->namelist_tail;
3006 if (p->formal != old->formal)
3008 gfc_free_formal_arglist (p->formal);
3009 p->formal = old->formal;
3012 free (p->old_symbol);
3013 p->old_symbol = NULL;
3017 changed_syms = NULL;
3019 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
3022 /* Procedure is already marked `error' by default. */
3025 tentative_tbp_list = NULL;
3029 /* Free sym->old_symbol. sym->old_symbol is mostly a shallow copy of sym; the
3030 components of old_symbol that might need deallocation are the "allocatables"
3031 that are restored in gfc_undo_symbols(), with two exceptions: namelist and
3032 namelist_tail. In case these differ between old_symbol and sym, it's just
3033 because sym->namelist has gotten a few more items. */
3036 free_old_symbol (gfc_symbol *sym)
3039 if (sym->old_symbol == NULL)
3042 if (sym->old_symbol->as != sym->as)
3043 gfc_free_array_spec (sym->old_symbol->as);
3045 if (sym->old_symbol->value != sym->value)
3046 gfc_free_expr (sym->old_symbol->value);
3048 if (sym->old_symbol->formal != sym->formal)
3049 gfc_free_formal_arglist (sym->old_symbol->formal);
3051 free (sym->old_symbol);
3052 sym->old_symbol = NULL;
3056 /* Makes the changes made in the current statement permanent-- gets
3057 rid of undo information. */
3060 gfc_commit_symbols (void)
3063 tentative_tbp *tbp, *tbq;
3065 for (p = changed_syms; p; p = q)
3071 free_old_symbol (p);
3073 changed_syms = NULL;
3075 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
3078 tbp->proc->error = 0;
3081 tentative_tbp_list = NULL;
3085 /* Makes the changes made in one symbol permanent -- gets rid of undo
3089 gfc_commit_symbol (gfc_symbol *sym)
3093 if (changed_syms == sym)
3094 changed_syms = sym->tlink;
3097 for (p = changed_syms; p; p = p->tlink)
3098 if (p->tlink == sym)
3100 p->tlink = sym->tlink;
3109 free_old_symbol (sym);
3113 /* Recursively free trees containing type-bound procedures. */
3116 free_tb_tree (gfc_symtree *t)
3121 free_tb_tree (t->left);
3122 free_tb_tree (t->right);
3124 /* TODO: Free type-bound procedure structs themselves; probably needs some
3125 sort of ref-counting mechanism. */
3131 /* Recursive function that deletes an entire tree and all the common
3132 head structures it points to. */
3135 free_common_tree (gfc_symtree * common_tree)
3137 if (common_tree == NULL)
3140 free_common_tree (common_tree->left);
3141 free_common_tree (common_tree->right);
3147 /* Recursive function that deletes an entire tree and all the user
3148 operator nodes that it contains. */
3151 free_uop_tree (gfc_symtree *uop_tree)
3153 if (uop_tree == NULL)
3156 free_uop_tree (uop_tree->left);
3157 free_uop_tree (uop_tree->right);
3159 gfc_free_interface (uop_tree->n.uop->op);
3160 free (uop_tree->n.uop);
3165 /* Recursive function that deletes an entire tree and all the symbols
3166 that it contains. */
3169 free_sym_tree (gfc_symtree *sym_tree)
3171 if (sym_tree == NULL)
3174 free_sym_tree (sym_tree->left);
3175 free_sym_tree (sym_tree->right);
3177 gfc_release_symbol (sym_tree->n.sym);
3182 /* Free the derived type list. */
3185 gfc_free_dt_list (void)
3187 gfc_dt_list *dt, *n;
3189 for (dt = gfc_derived_types; dt; dt = n)
3195 gfc_derived_types = NULL;
3199 /* Free the gfc_equiv_info's. */
3202 gfc_free_equiv_infos (gfc_equiv_info *s)
3206 gfc_free_equiv_infos (s->next);
3211 /* Free the gfc_equiv_lists. */
3214 gfc_free_equiv_lists (gfc_equiv_list *l)
3218 gfc_free_equiv_lists (l->next);
3219 gfc_free_equiv_infos (l->equiv);
3224 /* Free a finalizer procedure list. */
3227 gfc_free_finalizer (gfc_finalizer* el)
3231 gfc_release_symbol (el->proc_sym);
3237 gfc_free_finalizer_list (gfc_finalizer* list)
3241 gfc_finalizer* current = list;
3243 gfc_free_finalizer (current);
3248 /* Create a new gfc_charlen structure and add it to a namespace.
3249 If 'old_cl' is given, the newly created charlen will be a copy of it. */
3252 gfc_new_charlen (gfc_namespace *ns, gfc_charlen *old_cl)
3255 cl = gfc_get_charlen ();
3260 /* Put into namespace, but don't allow reject_statement
3261 to free it if old_cl is given. */
3262 gfc_charlen **prev = &ns->cl_list;
3263 cl->next = ns->old_cl_list;
3264 while (*prev != ns->old_cl_list)
3265 prev = &(*prev)->next;
3267 ns->old_cl_list = cl;
3268 cl->length = gfc_copy_expr (old_cl->length);
3269 cl->length_from_typespec = old_cl->length_from_typespec;
3270 cl->backend_decl = old_cl->backend_decl;
3271 cl->passed_length = old_cl->passed_length;
3272 cl->resolved = old_cl->resolved;
3276 /* Put into namespace. */
3277 cl->next = ns->cl_list;
3285 /* Free the charlen list from cl to end (end is not freed).
3286 Free the whole list if end is NULL. */
3289 gfc_free_charlen (gfc_charlen *cl, gfc_charlen *end)
3293 for (; cl != end; cl = cl2)
3298 gfc_free_expr (cl->length);
3304 /* Free entry list structs. */
3307 free_entry_list (gfc_entry_list *el)
3309 gfc_entry_list *next;
3316 free_entry_list (next);
3320 /* Free a namespace structure and everything below it. Interface
3321 lists associated with intrinsic operators are not freed. These are
3322 taken care of when a specific name is freed. */
3325 gfc_free_namespace (gfc_namespace *ns)
3327 gfc_namespace *p, *q;
3336 gcc_assert (ns->refs == 0);
3338 gfc_free_statements (ns->code);
3340 free_sym_tree (ns->sym_root);
3341 free_uop_tree (ns->uop_root);
3342 free_common_tree (ns->common_root);
3343 free_tb_tree (ns->tb_sym_root);
3344 free_tb_tree (ns->tb_uop_root);
3345 gfc_free_finalizer_list (ns->finalizers);
3346 gfc_free_charlen (ns->cl_list, NULL);
3347 free_st_labels (ns->st_labels);
3349 free_entry_list (ns->entries);
3350 gfc_free_equiv (ns->equiv);
3351 gfc_free_equiv_lists (ns->equiv_lists);
3352 gfc_free_use_stmts (ns->use_stmts);
3354 for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++)
3355 gfc_free_interface (ns->op[i]);
3357 gfc_free_data (ns->data);
3361 /* Recursively free any contained namespaces. */
3366 gfc_free_namespace (q);
3372 gfc_symbol_init_2 (void)
3375 gfc_current_ns = gfc_get_namespace (NULL, 0);
3380 gfc_symbol_done_2 (void)
3383 gfc_free_namespace (gfc_current_ns);
3384 gfc_current_ns = NULL;
3385 gfc_free_dt_list ();
3389 /* Count how many nodes a symtree has. */
3392 count_st_nodes (const gfc_symtree *st)
3398 nodes = count_st_nodes (st->left);
3400 nodes += count_st_nodes (st->right);
3406 /* Convert symtree tree into symtree vector. */
3409 fill_st_vector (gfc_symtree *st, gfc_symtree **st_vec, unsigned node_cntr)
3414 node_cntr = fill_st_vector (st->left, st_vec, node_cntr);
3415 st_vec[node_cntr++] = st;
3416 node_cntr = fill_st_vector (st->right, st_vec, node_cntr);
3422 /* Traverse namespace. As the functions might modify the symtree, we store the
3423 symtree as a vector and operate on this vector. Note: We assume that
3424 sym_func or st_func never deletes nodes from the symtree - only adding is
3425 allowed. Additionally, newly added nodes are not traversed. */
3428 do_traverse_symtree (gfc_symtree *st, void (*st_func) (gfc_symtree *),
3429 void (*sym_func) (gfc_symbol *))
3431 gfc_symtree **st_vec;
3432 unsigned nodes, i, node_cntr;
3434 gcc_assert ((st_func && !sym_func) || (!st_func && sym_func));
3435 nodes = count_st_nodes (st);
3436 st_vec = XALLOCAVEC (gfc_symtree *, nodes);
3438 fill_st_vector (st, st_vec, node_cntr);
3443 for (i = 0; i < nodes; i++)
3444 st_vec[i]->n.sym->mark = 0;
3445 for (i = 0; i < nodes; i++)
3446 if (!st_vec[i]->n.sym->mark)
3448 (*sym_func) (st_vec[i]->n.sym);
3449 st_vec[i]->n.sym->mark = 1;
3453 for (i = 0; i < nodes; i++)
3454 (*st_func) (st_vec[i]);
3458 /* Recursively traverse the symtree nodes. */
3461 gfc_traverse_symtree (gfc_symtree *st, void (*st_func) (gfc_symtree *))
3463 do_traverse_symtree (st, st_func, NULL);
3467 /* Call a given function for all symbols in the namespace. We take
3468 care that each gfc_symbol node is called exactly once. */
3471 gfc_traverse_ns (gfc_namespace *ns, void (*sym_func) (gfc_symbol *))
3473 do_traverse_symtree (ns->sym_root, NULL, sym_func);
3477 /* Return TRUE when name is the name of an intrinsic type. */
3480 gfc_is_intrinsic_typename (const char *name)
3482 if (strcmp (name, "integer") == 0
3483 || strcmp (name, "real") == 0
3484 || strcmp (name, "character") == 0
3485 || strcmp (name, "logical") == 0
3486 || strcmp (name, "complex") == 0
3487 || strcmp (name, "doubleprecision") == 0
3488 || strcmp (name, "doublecomplex") == 0)
3495 /* Return TRUE if the symbol is an automatic variable. */
3498 gfc_is_var_automatic (gfc_symbol *sym)
3500 /* Pointer and allocatable variables are never automatic. */
3501 if (sym->attr.pointer || sym->attr.allocatable)
3503 /* Check for arrays with non-constant size. */
3504 if (sym->attr.dimension && sym->as
3505 && !gfc_is_compile_time_shape (sym->as))
3507 /* Check for non-constant length character variables. */
3508 if (sym->ts.type == BT_CHARACTER
3510 && !gfc_is_constant_expr (sym->ts.u.cl->length))
3515 /* Given a symbol, mark it as SAVEd if it is allowed. */
3518 save_symbol (gfc_symbol *sym)
3521 if (sym->attr.use_assoc)
3524 if (sym->attr.in_common
3527 || sym->attr.flavor != FL_VARIABLE)
3529 /* Automatic objects are not saved. */
3530 if (gfc_is_var_automatic (sym))
3532 gfc_add_save (&sym->attr, SAVE_EXPLICIT, sym->name, &sym->declared_at);
3536 /* Mark those symbols which can be SAVEd as such. */
3539 gfc_save_all (gfc_namespace *ns)
3541 gfc_traverse_ns (ns, save_symbol);
3545 /* Make sure that no changes to symbols are pending. */
3548 gfc_enforce_clean_symbol_state(void)
3550 gcc_assert (changed_syms == NULL);
3554 /************** Global symbol handling ************/
3557 /* Search a tree for the global symbol. */
3560 gfc_find_gsymbol (gfc_gsymbol *symbol, const char *name)
3569 c = strcmp (name, symbol->name);
3573 symbol = (c < 0) ? symbol->left : symbol->right;
3580 /* Compare two global symbols. Used for managing the BB tree. */
3583 gsym_compare (void *_s1, void *_s2)
3585 gfc_gsymbol *s1, *s2;
3587 s1 = (gfc_gsymbol *) _s1;
3588 s2 = (gfc_gsymbol *) _s2;
3589 return strcmp (s1->name, s2->name);
3593 /* Get a global symbol, creating it if it doesn't exist. */
3596 gfc_get_gsymbol (const char *name)
3600 s = gfc_find_gsymbol (gfc_gsym_root, name);
3604 s = XCNEW (gfc_gsymbol);
3605 s->type = GSYM_UNKNOWN;
3606 s->name = gfc_get_string (name);
3608 gfc_insert_bbt (&gfc_gsym_root, s, gsym_compare);
3615 get_iso_c_binding_dt (int sym_id)
3617 gfc_dt_list *dt_list;
3619 dt_list = gfc_derived_types;
3621 /* Loop through the derived types in the name list, searching for
3622 the desired symbol from iso_c_binding. Search the parent namespaces
3623 if necessary and requested to (parent_flag). */
3624 while (dt_list != NULL)
3626 if (dt_list->derived->from_intmod != INTMOD_NONE
3627 && dt_list->derived->intmod_sym_id == sym_id)
3628 return dt_list->derived;
3630 dt_list = dt_list->next;
3637 /* Verifies that the given derived type symbol, derived_sym, is interoperable
3638 with C. This is necessary for any derived type that is BIND(C) and for
3639 derived types that are parameters to functions that are BIND(C). All
3640 fields of the derived type are required to be interoperable, and are tested
3641 for such. If an error occurs, the errors are reported here, allowing for
3642 multiple errors to be handled for a single derived type. */
3645 verify_bind_c_derived_type (gfc_symbol *derived_sym)
3647 gfc_component *curr_comp = NULL;
3648 gfc_try is_c_interop = FAILURE;
3649 gfc_try retval = SUCCESS;
3651 if (derived_sym == NULL)
3652 gfc_internal_error ("verify_bind_c_derived_type(): Given symbol is "
3653 "unexpectedly NULL");
3655 /* If we've already looked at this derived symbol, do not look at it again
3656 so we don't repeat warnings/errors. */
3657 if (derived_sym->ts.is_c_interop)
3660 /* The derived type must have the BIND attribute to be interoperable
3661 J3/04-007, Section 15.2.3. */
3662 if (derived_sym->attr.is_bind_c != 1)
3664 derived_sym->ts.is_c_interop = 0;
3665 gfc_error_now ("Derived type '%s' declared at %L must have the BIND "
3666 "attribute to be C interoperable", derived_sym->name,
3667 &(derived_sym->declared_at));
3671 curr_comp = derived_sym->components;
3673 /* Fortran 2003 allows an empty derived type. C99 appears to disallow an
3674 empty struct. Section 15.2 in Fortran 2003 states: "The following
3675 subclauses define the conditions under which a Fortran entity is
3676 interoperable. If a Fortran entity is interoperable, an equivalent
3677 entity may be defined by means of C and the Fortran entity is said
3678 to be interoperable with the C entity. There does not have to be such
3679 an interoperating C entity."
3681 if (curr_comp == NULL)
3683 gfc_warning ("Derived type '%s' with BIND(C) attribute at %L is empty, "
3684 "and may be inaccessible by the C companion processor",
3685 derived_sym->name, &(derived_sym->declared_at));
3686 derived_sym->ts.is_c_interop = 1;
3687 derived_sym->attr.is_bind_c = 1;
3692 /* Initialize the derived type as being C interoperable.
3693 If we find an error in the components, this will be set false. */
3694 derived_sym->ts.is_c_interop = 1;
3696 /* Loop through the list of components to verify that the kind of
3697 each is a C interoperable type. */
3700 /* The components cannot be pointers (fortran sense).
3701 J3/04-007, Section 15.2.3, C1505. */
3702 if (curr_comp->attr.pointer != 0)
3704 gfc_error ("Component '%s' at %L cannot have the "
3705 "POINTER attribute because it is a member "
3706 "of the BIND(C) derived type '%s' at %L",
3707 curr_comp->name, &(curr_comp->loc),
3708 derived_sym->name, &(derived_sym->declared_at));
3712 if (curr_comp->attr.proc_pointer != 0)
3714 gfc_error ("Procedure pointer component '%s' at %L cannot be a member"
3715 " of the BIND(C) derived type '%s' at %L", curr_comp->name,
3716 &curr_comp->loc, derived_sym->name,
3717 &derived_sym->declared_at);
3721 /* The components cannot be allocatable.
3722 J3/04-007, Section 15.2.3, C1505. */
3723 if (curr_comp->attr.allocatable != 0)
3725 gfc_error ("Component '%s' at %L cannot have the "
3726 "ALLOCATABLE attribute because it is a member "
3727 "of the BIND(C) derived type '%s' at %L",
3728 curr_comp->name, &(curr_comp->loc),
3729 derived_sym->name, &(derived_sym->declared_at));
3733 /* BIND(C) derived types must have interoperable components. */
3734 if (curr_comp->ts.type == BT_DERIVED
3735 && curr_comp->ts.u.derived->ts.is_iso_c != 1
3736 && curr_comp->ts.u.derived != derived_sym)
3738 /* This should be allowed; the draft says a derived-type can not
3739 have type parameters if it is has the BIND attribute. Type
3740 parameters seem to be for making parameterized derived types.
3741 There's no need to verify the type if it is c_ptr/c_funptr. */
3742 retval = verify_bind_c_derived_type (curr_comp->ts.u.derived);
3746 /* Grab the typespec for the given component and test the kind. */
3747 is_c_interop = gfc_verify_c_interop (&(curr_comp->ts));
3749 if (is_c_interop != SUCCESS)
3751 /* Report warning and continue since not fatal. The
3752 draft does specify a constraint that requires all fields
3753 to interoperate, but if the user says real(4), etc., it
3754 may interoperate with *something* in C, but the compiler
3755 most likely won't know exactly what. Further, it may not
3756 interoperate with the same data type(s) in C if the user
3757 recompiles with different flags (e.g., -m32 and -m64 on
3758 x86_64 and using integer(4) to claim interop with a
3760 if (derived_sym->attr.is_bind_c == 1
3761 && gfc_option.warn_c_binding_type)
3762 /* If the derived type is bind(c), all fields must be
3764 gfc_warning ("Component '%s' in derived type '%s' at %L "
3765 "may not be C interoperable, even though "
3766 "derived type '%s' is BIND(C)",
3767 curr_comp->name, derived_sym->name,
3768 &(curr_comp->loc), derived_sym->name);
3769 else if (gfc_option.warn_c_binding_type)
3770 /* If derived type is param to bind(c) routine, or to one
3771 of the iso_c_binding procs, it must be interoperable, so
3772 all fields must interop too. */
3773 gfc_warning ("Component '%s' in derived type '%s' at %L "
3774 "may not be C interoperable",
3775 curr_comp->name, derived_sym->name,
3780 curr_comp = curr_comp->next;
3781 } while (curr_comp != NULL);
3784 /* Make sure we don't have conflicts with the attributes. */
3785 if (derived_sym->attr.access == ACCESS_PRIVATE)
3787 gfc_error ("Derived type '%s' at %L cannot be declared with both "
3788 "PRIVATE and BIND(C) attributes", derived_sym->name,
3789 &(derived_sym->declared_at));
3793 if (derived_sym->attr.sequence != 0)
3795 gfc_error ("Derived type '%s' at %L cannot have the SEQUENCE "
3796 "attribute because it is BIND(C)", derived_sym->name,
3797 &(derived_sym->declared_at));
3801 /* Mark the derived type as not being C interoperable if we found an
3802 error. If there were only warnings, proceed with the assumption
3803 it's interoperable. */
3804 if (retval == FAILURE)
3805 derived_sym->ts.is_c_interop = 0;
3811 /* Generate symbols for the named constants c_null_ptr and c_null_funptr. */
3814 gen_special_c_interop_ptr (int ptr_id, const char *ptr_name,
3815 const char *module_name)
3817 gfc_symtree *tmp_symtree;
3818 gfc_symbol *tmp_sym;
3821 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, ptr_name);
3823 if (tmp_symtree != NULL)
3824 tmp_sym = tmp_symtree->n.sym;
3828 gfc_internal_error ("gen_special_c_interop_ptr(): Unable to "
3829 "create symbol for %s", ptr_name);
3832 tmp_sym->ts.is_c_interop = 1;
3833 tmp_sym->attr.is_c_interop = 1;
3834 tmp_sym->ts.is_iso_c = 1;
3835 tmp_sym->ts.type = BT_DERIVED;
3836 tmp_sym->attr.flavor = FL_PARAMETER;
3838 /* The c_ptr and c_funptr derived types will provide the
3839 definition for c_null_ptr and c_null_funptr, respectively. */
3840 if (ptr_id == ISOCBINDING_NULL_PTR)
3841 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_PTR);
3843 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3844 if (tmp_sym->ts.u.derived == NULL)
3846 /* This can occur if the user forgot to declare c_ptr or
3847 c_funptr and they're trying to use one of the procedures
3848 that has arg(s) of the missing type. In this case, a
3849 regular version of the thing should have been put in the
3852 generate_isocbinding_symbol (module_name, ptr_id == ISOCBINDING_NULL_PTR
3853 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR,
3854 (const char *) (ptr_id == ISOCBINDING_NULL_PTR
3857 tmp_sym->ts.u.derived =
3858 get_iso_c_binding_dt (ptr_id == ISOCBINDING_NULL_PTR
3859 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR);
3862 /* Module name is some mangled version of iso_c_binding. */
3863 tmp_sym->module = gfc_get_string (module_name);
3865 /* Say it's from the iso_c_binding module. */
3866 tmp_sym->attr.is_iso_c = 1;
3868 tmp_sym->attr.use_assoc = 1;
3869 tmp_sym->attr.is_bind_c = 1;
3870 /* Since we never generate a call to this symbol, don't set the
3873 /* Set the c_address field of c_null_ptr and c_null_funptr to
3874 the value of NULL. */
3875 tmp_sym->value = gfc_get_expr ();
3876 tmp_sym->value->expr_type = EXPR_STRUCTURE;
3877 tmp_sym->value->ts.type = BT_DERIVED;
3878 tmp_sym->value->ts.u.derived = tmp_sym->ts.u.derived;
3879 gfc_constructor_append_expr (&tmp_sym->value->value.constructor, NULL, NULL);
3880 c = gfc_constructor_first (tmp_sym->value->value.constructor);
3881 c->expr = gfc_get_expr ();
3882 c->expr->expr_type = EXPR_NULL;
3883 c->expr->ts.is_iso_c = 1;
3889 /* Add a formal argument, gfc_formal_arglist, to the
3890 end of the given list of arguments. Set the reference to the
3891 provided symbol, param_sym, in the argument. */
3894 add_formal_arg (gfc_formal_arglist **head,
3895 gfc_formal_arglist **tail,
3896 gfc_formal_arglist *formal_arg,
3897 gfc_symbol *param_sym)
3899 /* Put in list, either as first arg or at the tail (curr arg). */
3901 *head = *tail = formal_arg;
3904 (*tail)->next = formal_arg;
3905 (*tail) = formal_arg;
3908 (*tail)->sym = param_sym;
3909 (*tail)->next = NULL;
3915 /* Generates a symbol representing the CPTR argument to an
3916 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3917 CPTR and add it to the provided argument list. */
3920 gen_cptr_param (gfc_formal_arglist **head,
3921 gfc_formal_arglist **tail,
3922 const char *module_name,
3923 gfc_namespace *ns, const char *c_ptr_name,
3926 gfc_symbol *param_sym = NULL;
3927 gfc_symbol *c_ptr_sym = NULL;
3928 gfc_symtree *param_symtree = NULL;
3929 gfc_formal_arglist *formal_arg = NULL;
3930 const char *c_ptr_in;
3931 const char *c_ptr_type = NULL;
3933 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3934 c_ptr_type = "c_funptr";
3936 c_ptr_type = "c_ptr";
3938 if(c_ptr_name == NULL)
3939 c_ptr_in = "gfc_cptr__";
3941 c_ptr_in = c_ptr_name;
3942 gfc_get_sym_tree (c_ptr_in, ns, ¶m_symtree, false);
3943 if (param_symtree != NULL)
3944 param_sym = param_symtree->n.sym;
3946 gfc_internal_error ("gen_cptr_param(): Unable to "
3947 "create symbol for %s", c_ptr_in);
3949 /* Set up the appropriate fields for the new c_ptr param sym. */
3951 param_sym->attr.flavor = FL_DERIVED;
3952 param_sym->ts.type = BT_DERIVED;
3953 param_sym->attr.intent = INTENT_IN;
3954 param_sym->attr.dummy = 1;
3956 /* This will pass the ptr to the iso_c routines as a (void *). */
3957 param_sym->attr.value = 1;
3958 param_sym->attr.use_assoc = 1;
3960 /* Get the symbol for c_ptr or c_funptr, no matter what it's name is
3962 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3963 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3965 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_PTR);
3966 if (c_ptr_sym == NULL)
3968 /* This can happen if the user did not define c_ptr but they are
3969 trying to use one of the iso_c_binding functions that need it. */
3970 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3971 generate_isocbinding_symbol (module_name, ISOCBINDING_FUNPTR,
3972 (const char *)c_ptr_type);
3974 generate_isocbinding_symbol (module_name, ISOCBINDING_PTR,
3975 (const char *)c_ptr_type);
3977 gfc_get_ha_symbol (c_ptr_type, &(c_ptr_sym));
3980 param_sym->ts.u.derived = c_ptr_sym;
3981 param_sym->module = gfc_get_string (module_name);
3983 /* Make new formal arg. */
3984 formal_arg = gfc_get_formal_arglist ();
3985 /* Add arg to list of formal args (the CPTR arg). */
3986 add_formal_arg (head, tail, formal_arg, param_sym);
3988 /* Validate changes. */
3989 gfc_commit_symbol (param_sym);
3993 /* Generates a symbol representing the FPTR argument to an
3994 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3995 FPTR and add it to the provided argument list. */
3998 gen_fptr_param (gfc_formal_arglist **head,
3999 gfc_formal_arglist **tail,
4000 const char *module_name,
4001 gfc_namespace *ns, const char *f_ptr_name, int proc)
4003 gfc_symbol *param_sym = NULL;
4004 gfc_symtree *param_symtree = NULL;
4005 gfc_formal_arglist *formal_arg = NULL;
4006 const char *f_ptr_out = "gfc_fptr__";
4008 if (f_ptr_name != NULL)
4009 f_ptr_out = f_ptr_name;
4011 gfc_get_sym_tree (f_ptr_out, ns, ¶m_symtree, false);
4012 if (param_symtree != NULL)
4013 param_sym = param_symtree->n.sym;
4015 gfc_internal_error ("generateFPtrParam(): Unable to "
4016 "create symbol for %s", f_ptr_out);
4018 /* Set up the necessary fields for the fptr output param sym. */
4021 param_sym->attr.proc_pointer = 1;
4023 param_sym->attr.pointer = 1;
4024 param_sym->attr.dummy = 1;
4025 param_sym->attr.use_assoc = 1;
4027 /* ISO C Binding type to allow any pointer type as actual param. */
4028 param_sym->ts.type = BT_VOID;
4029 param_sym->module = gfc_get_string (module_name);
4032 formal_arg = gfc_get_formal_arglist ();
4033 /* Add arg to list of formal args. */
4034 add_formal_arg (head, tail, formal_arg, param_sym);
4036 /* Validate changes. */
4037 gfc_commit_symbol (param_sym);
4041 /* Generates a symbol representing the optional SHAPE argument for the
4042 iso_c_binding c_f_pointer() procedure. Also, create a
4043 gfc_formal_arglist for the SHAPE and add it to the provided
4047 gen_shape_param (gfc_formal_arglist **head,
4048 gfc_formal_arglist **tail,
4049 const char *module_name,
4050 gfc_namespace *ns, const char *shape_param_name)
4052 gfc_symbol *param_sym = NULL;
4053 gfc_symtree *param_symtree = NULL;
4054 gfc_formal_arglist *formal_arg = NULL;
4055 const char *shape_param = "gfc_shape_array__";
4057 if (shape_param_name != NULL)
4058 shape_param = shape_param_name;
4060 gfc_get_sym_tree (shape_param, ns, ¶m_symtree, false);
4061 if (param_symtree != NULL)
4062 param_sym = param_symtree->n.sym;
4064 gfc_internal_error ("generateShapeParam(): Unable to "
4065 "create symbol for %s", shape_param);
4067 /* Set up the necessary fields for the shape input param sym. */
4069 param_sym->attr.dummy = 1;
4070 param_sym->attr.use_assoc = 1;
4072 /* Integer array, rank 1, describing the shape of the object. Make it's
4073 type BT_VOID initially so we can accept any type/kind combination of
4074 integer. During gfc_iso_c_sub_interface (resolve.c), we'll make it
4075 of BT_INTEGER type. */
4076 param_sym->ts.type = BT_VOID;
4078 /* Initialize the kind to default integer. However, it will be overridden
4079 during resolution to match the kind of the SHAPE parameter given as
4080 the actual argument (to allow for any valid integer kind). */
4081 param_sym->ts.kind = gfc_default_integer_kind;
4082 param_sym->as = gfc_get_array_spec ();
4084 param_sym->as->rank = 1;
4085 param_sym->as->lower[0] = gfc_get_int_expr (gfc_default_integer_kind,
4088 /* The extent is unknown until we get it. The length give us
4089 the rank the incoming pointer. */
4090 param_sym->as->type = AS_ASSUMED_SHAPE;
4092 /* The arg is also optional; it is required iff the second arg
4093 (fptr) is to an array, otherwise, it's ignored. */
4094 param_sym->attr.optional = 1;
4095 param_sym->attr.intent = INTENT_IN;
4096 param_sym->attr.dimension = 1;
4097 param_sym->module = gfc_get_string (module_name);
4100 formal_arg = gfc_get_formal_arglist ();
4101 /* Add arg to list of formal args. */
4102 add_formal_arg (head, tail, formal_arg, param_sym);
4104 /* Validate changes. */
4105 gfc_commit_symbol (param_sym);
4109 /* Add a procedure interface to the given symbol (i.e., store a
4110 reference to the list of formal arguments). */
4113 add_proc_interface (gfc_symbol *sym, ifsrc source, gfc_formal_arglist *formal)
4116 sym->formal = formal;
4117 sym->attr.if_source = source;
4121 /* Copy the formal args from an existing symbol, src, into a new
4122 symbol, dest. New formal args are created, and the description of
4123 each arg is set according to the existing ones. This function is
4124 used when creating procedure declaration variables from a procedure
4125 declaration statement (see match_proc_decl()) to create the formal
4126 args based on the args of a given named interface. */
4129 gfc_copy_formal_args (gfc_symbol *dest, gfc_symbol *src, ifsrc if_src)
4131 gfc_formal_arglist *head = NULL;
4132 gfc_formal_arglist *tail = NULL;
4133 gfc_formal_arglist *formal_arg = NULL;
4134 gfc_formal_arglist *curr_arg = NULL;
4135 gfc_formal_arglist *formal_prev = NULL;
4136 /* Save current namespace so we can change it for formal args. */
4137 gfc_namespace *parent_ns = gfc_current_ns;
4139 /* Create a new namespace, which will be the formal ns (namespace
4140 of the formal args). */
4141 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4142 gfc_current_ns->proc_name = dest;
4143 dest->formal_ns = gfc_current_ns;
4145 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4147 formal_arg = gfc_get_formal_arglist ();
4148 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4150 /* May need to copy more info for the symbol. */
4151 formal_arg->sym->attr = curr_arg->sym->attr;
4152 formal_arg->sym->ts = curr_arg->sym->ts;
4153 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4154 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym,
4155 curr_arg->sym->attr.if_source);
4157 /* If this isn't the first arg, set up the next ptr. For the
4158 last arg built, the formal_arg->next will never get set to
4159 anything other than NULL. */
4160 if (formal_prev != NULL)
4161 formal_prev->next = formal_arg;
4163 formal_arg->next = NULL;
4165 formal_prev = formal_arg;
4167 /* Add arg to list of formal args. */
4168 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4170 /* Validate changes. */
4171 gfc_commit_symbol (formal_arg->sym);
4174 /* Add the interface to the symbol. */
4175 add_proc_interface (dest, if_src, head);
4177 /* Store the formal namespace information. */
4178 if (dest->formal != NULL)
4179 /* The current ns should be that for the dest proc. */
4180 dest->formal_ns = gfc_current_ns;
4181 /* Restore the current namespace to what it was on entry. */
4182 gfc_current_ns = parent_ns;
4187 gfc_copy_formal_args_intr (gfc_symbol *dest, gfc_intrinsic_sym *src)
4189 gfc_formal_arglist *head = NULL;
4190 gfc_formal_arglist *tail = NULL;
4191 gfc_formal_arglist *formal_arg = NULL;
4192 gfc_intrinsic_arg *curr_arg = NULL;
4193 gfc_formal_arglist *formal_prev = NULL;
4194 /* Save current namespace so we can change it for formal args. */
4195 gfc_namespace *parent_ns = gfc_current_ns;
4197 /* Create a new namespace, which will be the formal ns (namespace
4198 of the formal args). */
4199 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4200 gfc_current_ns->proc_name = dest;
4202 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4204 formal_arg = gfc_get_formal_arglist ();
4205 gfc_get_symbol (curr_arg->name, gfc_current_ns, &(formal_arg->sym));
4207 /* May need to copy more info for the symbol. */
4208 formal_arg->sym->ts = curr_arg->ts;
4209 formal_arg->sym->attr.optional = curr_arg->optional;
4210 formal_arg->sym->attr.value = curr_arg->value;
4211 formal_arg->sym->attr.intent = curr_arg->intent;
4212 formal_arg->sym->attr.flavor = FL_VARIABLE;
4213 formal_arg->sym->attr.dummy = 1;
4215 if (formal_arg->sym->ts.type == BT_CHARACTER)
4216 formal_arg->sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4218 /* If this isn't the first arg, set up the next ptr. For the
4219 last arg built, the formal_arg->next will never get set to
4220 anything other than NULL. */
4221 if (formal_prev != NULL)
4222 formal_prev->next = formal_arg;
4224 formal_arg->next = NULL;
4226 formal_prev = formal_arg;
4228 /* Add arg to list of formal args. */
4229 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4231 /* Validate changes. */
4232 gfc_commit_symbol (formal_arg->sym);
4235 /* Add the interface to the symbol. */
4236 add_proc_interface (dest, IFSRC_DECL, head);
4238 /* Store the formal namespace information. */
4239 if (dest->formal != NULL)
4240 /* The current ns should be that for the dest proc. */
4241 dest->formal_ns = gfc_current_ns;
4242 /* Restore the current namespace to what it was on entry. */
4243 gfc_current_ns = parent_ns;
4248 gfc_copy_formal_args_ppc (gfc_component *dest, gfc_symbol *src, ifsrc if_src)
4250 gfc_formal_arglist *head = NULL;
4251 gfc_formal_arglist *tail = NULL;
4252 gfc_formal_arglist *formal_arg = NULL;
4253 gfc_formal_arglist *curr_arg = NULL;
4254 gfc_formal_arglist *formal_prev = NULL;
4255 /* Save current namespace so we can change it for formal args. */
4256 gfc_namespace *parent_ns = gfc_current_ns;
4258 /* Create a new namespace, which will be the formal ns (namespace
4259 of the formal args). */
4260 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4261 /* TODO: gfc_current_ns->proc_name = dest;*/
4263 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4265 formal_arg = gfc_get_formal_arglist ();
4266 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4268 /* May need to copy more info for the symbol. */
4269 formal_arg->sym->attr = curr_arg->sym->attr;
4270 formal_arg->sym->ts = curr_arg->sym->ts;
4271 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4272 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym,
4273 curr_arg->sym->attr.if_source);
4275 /* If this isn't the first arg, set up the next ptr. For the
4276 last arg built, the formal_arg->next will never get set to
4277 anything other than NULL. */
4278 if (formal_prev != NULL)
4279 formal_prev->next = formal_arg;
4281 formal_arg->next = NULL;
4283 formal_prev = formal_arg;
4285 /* Add arg to list of formal args. */
4286 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4288 /* Validate changes. */
4289 gfc_commit_symbol (formal_arg->sym);
4292 /* Add the interface to the symbol. */
4293 gfc_free_formal_arglist (dest->formal);
4294 dest->formal = head;
4295 dest->attr.if_source = if_src;
4297 /* Store the formal namespace information. */
4298 if (dest->formal != NULL)
4299 /* The current ns should be that for the dest proc. */
4300 dest->formal_ns = gfc_current_ns;
4301 /* Restore the current namespace to what it was on entry. */
4302 gfc_current_ns = parent_ns;
4306 /* Builds the parameter list for the iso_c_binding procedure
4307 c_f_pointer or c_f_procpointer. The old_sym typically refers to a
4308 generic version of either the c_f_pointer or c_f_procpointer
4309 functions. The new_proc_sym represents a "resolved" version of the
4310 symbol. The functions are resolved to match the types of their
4311 parameters; for example, c_f_pointer(cptr, fptr) would resolve to
4312 something similar to c_f_pointer_i4 if the type of data object fptr
4313 pointed to was a default integer. The actual name of the resolved
4314 procedure symbol is further mangled with the module name, etc., but
4315 the idea holds true. */
4318 build_formal_args (gfc_symbol *new_proc_sym,
4319 gfc_symbol *old_sym, int add_optional_arg)
4321 gfc_formal_arglist *head = NULL, *tail = NULL;
4322 gfc_namespace *parent_ns = NULL;
4324 parent_ns = gfc_current_ns;
4325 /* Create a new namespace, which will be the formal ns (namespace
4326 of the formal args). */
4327 gfc_current_ns = gfc_get_namespace(parent_ns, 0);
4328 gfc_current_ns->proc_name = new_proc_sym;
4330 /* Generate the params. */
4331 if (old_sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER)
4333 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4334 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4335 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4336 gfc_current_ns, "fptr", 1);
4338 else if (old_sym->intmod_sym_id == ISOCBINDING_F_POINTER)
4340 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4341 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4342 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4343 gfc_current_ns, "fptr", 0);
4344 /* If we're dealing with c_f_pointer, it has an optional third arg. */
4345 gen_shape_param (&head, &tail,(const char *) new_proc_sym->module,
4346 gfc_current_ns, "shape");
4349 else if (old_sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
4351 /* c_associated has one required arg and one optional; both
4353 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4354 gfc_current_ns, "c_ptr_1", ISOCBINDING_ASSOCIATED);
4355 if (add_optional_arg)
4357 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4358 gfc_current_ns, "c_ptr_2", ISOCBINDING_ASSOCIATED);
4359 /* The last param is optional so mark it as such. */
4360 tail->sym->attr.optional = 1;
4364 /* Add the interface (store formal args to new_proc_sym). */
4365 add_proc_interface (new_proc_sym, IFSRC_DECL, head);
4367 /* Set up the formal_ns pointer to the one created for the
4368 new procedure so it'll get cleaned up during gfc_free_symbol(). */
4369 new_proc_sym->formal_ns = gfc_current_ns;
4371 gfc_current_ns = parent_ns;
4375 std_for_isocbinding_symbol (int id)
4379 #define NAMED_INTCST(a,b,c,d) \
4382 #include "iso-c-binding.def"
4385 #define NAMED_FUNCTION(a,b,c,d) \
4388 #include "iso-c-binding.def"
4389 #undef NAMED_FUNCTION
4392 return GFC_STD_F2003;
4396 /* Generate the given set of C interoperable kind objects, or all
4397 interoperable kinds. This function will only be given kind objects
4398 for valid iso_c_binding defined types because this is verified when
4399 the 'use' statement is parsed. If the user gives an 'only' clause,
4400 the specific kinds are looked up; if they don't exist, an error is
4401 reported. If the user does not give an 'only' clause, all
4402 iso_c_binding symbols are generated. If a list of specific kinds
4403 is given, it must have a NULL in the first empty spot to mark the
4408 generate_isocbinding_symbol (const char *mod_name, iso_c_binding_symbol s,
4409 const char *local_name)
4411 const char *const name = (local_name && local_name[0]) ? local_name
4412 : c_interop_kinds_table[s].name;
4413 gfc_symtree *tmp_symtree = NULL;
4414 gfc_symbol *tmp_sym = NULL;
4417 if (gfc_notification_std (std_for_isocbinding_symbol (s)) == ERROR)
4420 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, name);
4422 /* Already exists in this scope so don't re-add it. */
4423 if (tmp_symtree != NULL && (tmp_sym = tmp_symtree->n.sym) != NULL
4424 && (!tmp_sym->attr.generic
4425 || (tmp_sym = gfc_find_dt_in_generic (tmp_sym)) != NULL)
4426 && tmp_sym->from_intmod == INTMOD_ISO_C_BINDING)
4428 if (tmp_sym->attr.flavor == FL_DERIVED
4429 && !get_iso_c_binding_dt (tmp_sym->intmod_sym_id))
4431 gfc_dt_list *dt_list;
4432 dt_list = gfc_get_dt_list ();
4433 dt_list->derived = tmp_sym;
4434 dt_list->next = gfc_derived_types;
4435 gfc_derived_types = dt_list;
4441 /* Create the sym tree in the current ns. */
4442 gfc_get_sym_tree (name, gfc_current_ns, &tmp_symtree, false);
4444 tmp_sym = tmp_symtree->n.sym;
4446 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4449 /* Say what module this symbol belongs to. */
4450 tmp_sym->module = gfc_get_string (mod_name);
4451 tmp_sym->from_intmod = INTMOD_ISO_C_BINDING;
4452 tmp_sym->intmod_sym_id = s;
4457 #define NAMED_INTCST(a,b,c,d) case a :
4458 #define NAMED_REALCST(a,b,c,d) case a :
4459 #define NAMED_CMPXCST(a,b,c,d) case a :
4460 #define NAMED_LOGCST(a,b,c) case a :
4461 #define NAMED_CHARKNDCST(a,b,c) case a :
4462 #include "iso-c-binding.def"
4464 tmp_sym->value = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4465 c_interop_kinds_table[s].value);
4467 /* Initialize an integer constant expression node. */
4468 tmp_sym->attr.flavor = FL_PARAMETER;
4469 tmp_sym->ts.type = BT_INTEGER;
4470 tmp_sym->ts.kind = gfc_default_integer_kind;
4472 /* Mark this type as a C interoperable one. */
4473 tmp_sym->ts.is_c_interop = 1;
4474 tmp_sym->ts.is_iso_c = 1;
4475 tmp_sym->value->ts.is_c_interop = 1;
4476 tmp_sym->value->ts.is_iso_c = 1;
4477 tmp_sym->attr.is_c_interop = 1;
4479 /* Tell what f90 type this c interop kind is valid. */
4480 tmp_sym->ts.f90_type = c_interop_kinds_table[s].f90_type;
4482 /* Say it's from the iso_c_binding module. */
4483 tmp_sym->attr.is_iso_c = 1;
4485 /* Make it use associated. */
4486 tmp_sym->attr.use_assoc = 1;
4490 #define NAMED_CHARCST(a,b,c) case a :
4491 #include "iso-c-binding.def"
4493 /* Initialize an integer constant expression node for the
4494 length of the character. */
4495 tmp_sym->value = gfc_get_character_expr (gfc_default_character_kind,
4496 &gfc_current_locus, NULL, 1);
4497 tmp_sym->value->ts.is_c_interop = 1;
4498 tmp_sym->value->ts.is_iso_c = 1;
4499 tmp_sym->value->value.character.length = 1;
4500 tmp_sym->value->value.character.string[0]
4501 = (gfc_char_t) c_interop_kinds_table[s].value;
4502 tmp_sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4503 tmp_sym->ts.u.cl->length = gfc_get_int_expr (gfc_default_integer_kind,
4506 /* May not need this in both attr and ts, but do need in
4507 attr for writing module file. */
4508 tmp_sym->attr.is_c_interop = 1;
4510 tmp_sym->attr.flavor = FL_PARAMETER;
4511 tmp_sym->ts.type = BT_CHARACTER;
4513 /* Need to set it to the C_CHAR kind. */
4514 tmp_sym->ts.kind = gfc_default_character_kind;
4516 /* Mark this type as a C interoperable one. */
4517 tmp_sym->ts.is_c_interop = 1;
4518 tmp_sym->ts.is_iso_c = 1;
4520 /* Tell what f90 type this c interop kind is valid. */
4521 tmp_sym->ts.f90_type = BT_CHARACTER;
4523 /* Say it's from the iso_c_binding module. */
4524 tmp_sym->attr.is_iso_c = 1;
4526 /* Make it use associated. */
4527 tmp_sym->attr.use_assoc = 1;
4530 case ISOCBINDING_PTR:
4531 case ISOCBINDING_FUNPTR:
4533 gfc_interface *intr, *head;
4535 const char *hidden_name;
4536 gfc_dt_list **dt_list_ptr = NULL;
4537 gfc_component *tmp_comp = NULL;
4538 char comp_name[(GFC_MAX_SYMBOL_LEN * 2) + 1];
4540 hidden_name = gfc_get_string ("%c%s",
4541 (char) TOUPPER ((unsigned char) tmp_sym->name[0]),
4544 /* Generate real derived type. */
4545 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
4548 if (tmp_symtree != NULL)
4550 gfc_get_sym_tree (hidden_name, gfc_current_ns, &tmp_symtree, false);
4552 dt_sym = tmp_symtree->n.sym;
4556 /* Generate an artificial generic function. */
4557 dt_sym->name = gfc_get_string (tmp_sym->name);
4558 head = tmp_sym->generic;
4559 intr = gfc_get_interface ();
4561 intr->where = gfc_current_locus;
4563 tmp_sym->generic = intr;
4565 if (!tmp_sym->attr.generic
4566 && gfc_add_generic (&tmp_sym->attr, tmp_sym->name, NULL)
4570 if (!tmp_sym->attr.function
4571 && gfc_add_function (&tmp_sym->attr, tmp_sym->name, NULL)
4575 /* Say what module this symbol belongs to. */
4576 dt_sym->module = gfc_get_string (mod_name);
4577 dt_sym->from_intmod = INTMOD_ISO_C_BINDING;
4578 dt_sym->intmod_sym_id = s;
4580 /* Initialize an integer constant expression node. */
4581 dt_sym->attr.flavor = FL_DERIVED;
4582 dt_sym->ts.is_c_interop = 1;
4583 dt_sym->attr.is_c_interop = 1;
4584 dt_sym->attr.is_iso_c = 1;
4585 dt_sym->ts.is_iso_c = 1;
4586 dt_sym->ts.type = BT_DERIVED;
4588 /* A derived type must have the bind attribute to be
4589 interoperable (J3/04-007, Section 15.2.3), even though
4590 the binding label is not used. */
4591 dt_sym->attr.is_bind_c = 1;
4593 dt_sym->attr.referenced = 1;
4594 dt_sym->ts.u.derived = dt_sym;
4596 /* Add the symbol created for the derived type to the current ns. */
4597 dt_list_ptr = &(gfc_derived_types);
4598 while (*dt_list_ptr != NULL && (*dt_list_ptr)->next != NULL)
4599 dt_list_ptr = &((*dt_list_ptr)->next);
4601 /* There is already at least one derived type in the list, so append
4602 the one we're currently building for c_ptr or c_funptr. */
4603 if (*dt_list_ptr != NULL)
4604 dt_list_ptr = &((*dt_list_ptr)->next);
4605 (*dt_list_ptr) = gfc_get_dt_list ();
4606 (*dt_list_ptr)->derived = dt_sym;
4607 (*dt_list_ptr)->next = NULL;
4609 /* Set up the component of the derived type, which will be
4610 an integer with kind equal to c_ptr_size. Mangle the name of
4611 the field for the c_address to prevent the curious user from
4612 trying to access it from Fortran. */
4613 sprintf (comp_name, "__%s_%s", dt_sym->name, "c_address");
4614 gfc_add_component (dt_sym, comp_name, &tmp_comp);
4615 if (tmp_comp == NULL)
4616 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4617 "create component for c_address");
4619 tmp_comp->ts.type = BT_INTEGER;
4621 /* Set this because the module will need to read/write this field. */
4622 tmp_comp->ts.f90_type = BT_INTEGER;
4624 /* The kinds for c_ptr and c_funptr are the same. */
4625 index = get_c_kind ("c_ptr", c_interop_kinds_table);
4626 tmp_comp->ts.kind = c_interop_kinds_table[index].value;
4628 tmp_comp->attr.pointer = 0;
4629 tmp_comp->attr.dimension = 0;
4631 /* Mark the component as C interoperable. */
4632 tmp_comp->ts.is_c_interop = 1;
4634 /* Make it use associated (iso_c_binding module). */
4635 dt_sym->attr.use_assoc = 1;
4640 case ISOCBINDING_NULL_PTR:
4641 case ISOCBINDING_NULL_FUNPTR:
4642 gen_special_c_interop_ptr (s, name, mod_name);
4645 case ISOCBINDING_F_POINTER:
4646 case ISOCBINDING_ASSOCIATED:
4647 case ISOCBINDING_LOC:
4648 case ISOCBINDING_FUNLOC:
4649 case ISOCBINDING_F_PROCPOINTER:
4651 tmp_sym->attr.proc = PROC_MODULE;
4653 /* Use the procedure's name as it is in the iso_c_binding module for
4654 setting the binding label in case the user renamed the symbol. */
4655 tmp_sym->binding_label =
4656 gfc_get_string ("%s_%s", mod_name,
4657 c_interop_kinds_table[s].name);
4658 tmp_sym->attr.is_iso_c = 1;
4659 if (s == ISOCBINDING_F_POINTER || s == ISOCBINDING_F_PROCPOINTER)
4660 tmp_sym->attr.subroutine = 1;
4663 /* TODO! This needs to be finished more for the expr of the
4664 function or something!
4665 This may not need to be here, because trying to do c_loc
4667 if (s == ISOCBINDING_ASSOCIATED)
4669 tmp_sym->attr.function = 1;
4670 tmp_sym->ts.type = BT_LOGICAL;
4671 tmp_sym->ts.kind = gfc_default_logical_kind;
4672 tmp_sym->result = tmp_sym;
4676 /* Here, we're taking the simple approach. We're defining
4677 c_loc as an external identifier so the compiler will put
4678 what we expect on the stack for the address we want the
4680 tmp_sym->ts.type = BT_DERIVED;
4681 if (s == ISOCBINDING_LOC)
4682 tmp_sym->ts.u.derived =
4683 get_iso_c_binding_dt (ISOCBINDING_PTR);
4685 tmp_sym->ts.u.derived =
4686 get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
4688 if (tmp_sym->ts.u.derived == NULL)
4690 /* Create the necessary derived type so we can continue
4691 processing the file. */
4692 generate_isocbinding_symbol
4693 (mod_name, s == ISOCBINDING_FUNLOC
4694 ? ISOCBINDING_FUNPTR : ISOCBINDING_PTR,
4695 (const char *)(s == ISOCBINDING_FUNLOC
4696 ? "c_funptr" : "c_ptr"));
4697 tmp_sym->ts.u.derived =
4698 get_iso_c_binding_dt (s == ISOCBINDING_FUNLOC
4699 ? ISOCBINDING_FUNPTR
4703 /* The function result is itself (no result clause). */
4704 tmp_sym->result = tmp_sym;
4705 tmp_sym->attr.external = 1;
4706 tmp_sym->attr.use_assoc = 0;
4707 tmp_sym->attr.pure = 1;
4708 tmp_sym->attr.if_source = IFSRC_UNKNOWN;
4709 tmp_sym->attr.proc = PROC_UNKNOWN;
4713 tmp_sym->attr.flavor = FL_PROCEDURE;
4714 tmp_sym->attr.contained = 0;
4716 /* Try using this builder routine, with the new and old symbols
4717 both being the generic iso_c proc sym being created. This
4718 will create the formal args (and the new namespace for them).
4719 Don't build an arg list for c_loc because we're going to treat
4720 c_loc as an external procedure. */
4721 if (s != ISOCBINDING_LOC && s != ISOCBINDING_FUNLOC)
4722 /* The 1 says to add any optional args, if applicable. */
4723 build_formal_args (tmp_sym, tmp_sym, 1);
4725 /* Set this after setting up the symbol, to prevent error messages. */
4726 tmp_sym->attr.use_assoc = 1;
4728 /* This symbol will not be referenced directly. It will be
4729 resolved to the implementation for the given f90 kind. */
4730 tmp_sym->attr.referenced = 0;
4737 gfc_commit_symbol (tmp_sym);
4741 /* Creates a new symbol based off of an old iso_c symbol, with a new
4742 binding label. This function can be used to create a new,
4743 resolved, version of a procedure symbol for c_f_pointer or
4744 c_f_procpointer that is based on the generic symbols. A new
4745 parameter list is created for the new symbol using
4746 build_formal_args(). The add_optional_flag specifies whether the
4747 to add the optional SHAPE argument. The new symbol is
4751 get_iso_c_sym (gfc_symbol *old_sym, char *new_name,
4752 const char *new_binding_label, int add_optional_arg)
4754 gfc_symtree *new_symtree = NULL;
4756 /* See if we have a symbol by that name already available, looking
4757 through any parent namespaces. */
4758 gfc_find_sym_tree (new_name, gfc_current_ns, 1, &new_symtree);
4759 if (new_symtree != NULL)
4760 /* Return the existing symbol. */
4761 return new_symtree->n.sym;
4763 /* Create the symtree/symbol, with attempted host association. */
4764 gfc_get_ha_sym_tree (new_name, &new_symtree);
4765 if (new_symtree == NULL)
4766 gfc_internal_error ("get_iso_c_sym(): Unable to create "
4767 "symtree for '%s'", new_name);
4769 /* Now fill in the fields of the resolved symbol with the old sym. */
4770 new_symtree->n.sym->binding_label = new_binding_label;
4771 new_symtree->n.sym->attr = old_sym->attr;
4772 new_symtree->n.sym->ts = old_sym->ts;
4773 new_symtree->n.sym->module = gfc_get_string (old_sym->module);
4774 new_symtree->n.sym->from_intmod = old_sym->from_intmod;
4775 new_symtree->n.sym->intmod_sym_id = old_sym->intmod_sym_id;
4776 if (old_sym->attr.function)
4777 new_symtree->n.sym->result = new_symtree->n.sym;
4778 /* Build the formal arg list. */
4779 build_formal_args (new_symtree->n.sym, old_sym, add_optional_arg);
4781 gfc_commit_symbol (new_symtree->n.sym);
4783 return new_symtree->n.sym;
4787 /* Check that a symbol is already typed. If strict is not set, an untyped
4788 symbol is acceptable for non-standard-conforming mode. */
4791 gfc_check_symbol_typed (gfc_symbol* sym, gfc_namespace* ns,
4792 bool strict, locus where)
4796 if (gfc_matching_prefix)
4799 /* Check for the type and try to give it an implicit one. */
4800 if (sym->ts.type == BT_UNKNOWN
4801 && gfc_set_default_type (sym, 0, ns) == FAILURE)
4805 gfc_error ("Symbol '%s' is used before it is typed at %L",
4810 if (gfc_notify_std (GFC_STD_GNU,
4811 "Symbol '%s' is used before"
4812 " it is typed at %L", sym->name, &where) == FAILURE)
4816 /* Everything is ok. */
4821 /* Construct a typebound-procedure structure. Those are stored in a tentative
4822 list and marked `error' until symbols are committed. */
4825 gfc_get_typebound_proc (gfc_typebound_proc *tb0)
4827 gfc_typebound_proc *result;
4828 tentative_tbp *list_node;
4830 result = XCNEW (gfc_typebound_proc);
4835 list_node = XCNEW (tentative_tbp);
4836 list_node->next = tentative_tbp_list;
4837 list_node->proc = result;
4838 tentative_tbp_list = list_node;
4844 /* Get the super-type of a given derived type. */
4847 gfc_get_derived_super_type (gfc_symbol* derived)
4849 gcc_assert (derived);
4851 if (derived->attr.generic)
4852 derived = gfc_find_dt_in_generic (derived);
4854 if (!derived->attr.extension)
4857 gcc_assert (derived->components);
4858 gcc_assert (derived->components->ts.type == BT_DERIVED);
4859 gcc_assert (derived->components->ts.u.derived);
4861 if (derived->components->ts.u.derived->attr.generic)
4862 return gfc_find_dt_in_generic (derived->components->ts.u.derived);
4864 return derived->components->ts.u.derived;
4868 /* Get the ultimate super-type of a given derived type. */
4871 gfc_get_ultimate_derived_super_type (gfc_symbol* derived)
4873 if (!derived->attr.extension)
4876 derived = gfc_get_derived_super_type (derived);
4878 if (derived->attr.extension)
4879 return gfc_get_ultimate_derived_super_type (derived);
4885 /* Check if a derived type t2 is an extension of (or equal to) a type t1. */
4888 gfc_type_is_extension_of (gfc_symbol *t1, gfc_symbol *t2)
4890 while (!gfc_compare_derived_types (t1, t2) && t2->attr.extension)
4891 t2 = gfc_get_derived_super_type (t2);
4892 return gfc_compare_derived_types (t1, t2);
4896 /* Check if two typespecs are type compatible (F03:5.1.1.2):
4897 If ts1 is nonpolymorphic, ts2 must be the same type.
4898 If ts1 is polymorphic (CLASS), ts2 must be an extension of ts1. */
4901 gfc_type_compatible (gfc_typespec *ts1, gfc_typespec *ts2)
4903 bool is_class1 = (ts1->type == BT_CLASS);
4904 bool is_class2 = (ts2->type == BT_CLASS);
4905 bool is_derived1 = (ts1->type == BT_DERIVED);
4906 bool is_derived2 = (ts2->type == BT_DERIVED);
4908 if (!is_derived1 && !is_derived2 && !is_class1 && !is_class2)
4909 return (ts1->type == ts2->type);
4911 if (is_derived1 && is_derived2)
4912 return gfc_compare_derived_types (ts1->u.derived, ts2->u.derived);
4914 if (is_class1 && is_derived2)
4915 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4917 else if (is_class1 && is_class2)
4918 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4919 ts2->u.derived->components->ts.u.derived);
4925 /* Find the parent-namespace of the current function. If we're inside
4926 BLOCK constructs, it may not be the current one. */
4929 gfc_find_proc_namespace (gfc_namespace* ns)
4931 while (ns->construct_entities)
4941 /* Check if an associate-variable should be translated as an `implicit' pointer
4942 internally (if it is associated to a variable and not an array with
4946 gfc_is_associate_pointer (gfc_symbol* sym)
4951 if (sym->ts.type == BT_CLASS)
4954 if (!sym->assoc->variable)
4957 if (sym->attr.dimension && sym->as->type != AS_EXPLICIT)
4965 gfc_find_dt_in_generic (gfc_symbol *sym)
4967 gfc_interface *intr = NULL;
4969 if (!sym || sym->attr.flavor == FL_DERIVED)
4972 if (sym->attr.generic)
4973 for (intr = sym->generic; intr; intr = intr->next)
4974 if (intr->sym->attr.flavor == FL_DERIVED)
4976 return intr ? intr->sym : NULL;