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/>. */
30 #include "constructor.h"
33 /* Strings for all symbol attributes. We use these for dumping the
34 parse tree, in error messages, and also when reading and writing
37 const mstring flavors[] =
39 minit ("UNKNOWN-FL", FL_UNKNOWN), minit ("PROGRAM", FL_PROGRAM),
40 minit ("BLOCK-DATA", FL_BLOCK_DATA), minit ("MODULE", FL_MODULE),
41 minit ("VARIABLE", FL_VARIABLE), minit ("PARAMETER", FL_PARAMETER),
42 minit ("LABEL", FL_LABEL), minit ("PROCEDURE", FL_PROCEDURE),
43 minit ("DERIVED", FL_DERIVED), minit ("NAMELIST", FL_NAMELIST),
47 const mstring procedures[] =
49 minit ("UNKNOWN-PROC", PROC_UNKNOWN),
50 minit ("MODULE-PROC", PROC_MODULE),
51 minit ("INTERNAL-PROC", PROC_INTERNAL),
52 minit ("DUMMY-PROC", PROC_DUMMY),
53 minit ("INTRINSIC-PROC", PROC_INTRINSIC),
54 minit ("EXTERNAL-PROC", PROC_EXTERNAL),
55 minit ("STATEMENT-PROC", PROC_ST_FUNCTION),
59 const mstring intents[] =
61 minit ("UNKNOWN-INTENT", INTENT_UNKNOWN),
62 minit ("IN", INTENT_IN),
63 minit ("OUT", INTENT_OUT),
64 minit ("INOUT", INTENT_INOUT),
68 const mstring access_types[] =
70 minit ("UNKNOWN-ACCESS", ACCESS_UNKNOWN),
71 minit ("PUBLIC", ACCESS_PUBLIC),
72 minit ("PRIVATE", ACCESS_PRIVATE),
76 const mstring ifsrc_types[] =
78 minit ("UNKNOWN", IFSRC_UNKNOWN),
79 minit ("DECL", IFSRC_DECL),
80 minit ("BODY", IFSRC_IFBODY)
83 const mstring save_status[] =
85 minit ("UNKNOWN", SAVE_NONE),
86 minit ("EXPLICIT-SAVE", SAVE_EXPLICIT),
87 minit ("IMPLICIT-SAVE", SAVE_IMPLICIT),
90 /* This is to make sure the backend generates setup code in the correct
93 static int next_dummy_order = 1;
96 gfc_namespace *gfc_current_ns;
97 gfc_namespace *gfc_global_ns_list;
99 gfc_gsymbol *gfc_gsym_root = NULL;
101 static gfc_symbol *changed_syms = NULL;
103 gfc_dt_list *gfc_derived_types;
106 /* List of tentative typebound-procedures. */
108 typedef struct tentative_tbp
110 gfc_typebound_proc *proc;
111 struct tentative_tbp *next;
115 static tentative_tbp *tentative_tbp_list = NULL;
118 /*********** IMPLICIT NONE and IMPLICIT statement handlers ***********/
120 /* The following static variable indicates whether a particular element has
121 been explicitly set or not. */
123 static int new_flag[GFC_LETTERS];
126 /* Handle a correctly parsed IMPLICIT NONE. */
129 gfc_set_implicit_none (void)
133 if (gfc_current_ns->seen_implicit_none)
135 gfc_error ("Duplicate IMPLICIT NONE statement at %C");
139 gfc_current_ns->seen_implicit_none = 1;
141 for (i = 0; i < GFC_LETTERS; i++)
143 gfc_clear_ts (&gfc_current_ns->default_type[i]);
144 gfc_current_ns->set_flag[i] = 1;
149 /* Reset the implicit range flags. */
152 gfc_clear_new_implicit (void)
156 for (i = 0; i < GFC_LETTERS; i++)
161 /* Prepare for a new implicit range. Sets flags in new_flag[]. */
164 gfc_add_new_implicit_range (int c1, int c2)
171 for (i = c1; i <= c2; i++)
175 gfc_error ("Letter '%c' already set in IMPLICIT statement at %C",
187 /* Add a matched implicit range for gfc_set_implicit(). Check if merging
188 the new implicit types back into the existing types will work. */
191 gfc_merge_new_implicit (gfc_typespec *ts)
195 if (gfc_current_ns->seen_implicit_none)
197 gfc_error ("Cannot specify IMPLICIT at %C after IMPLICIT NONE");
201 for (i = 0; i < GFC_LETTERS; i++)
205 if (gfc_current_ns->set_flag[i])
207 gfc_error ("Letter %c already has an IMPLICIT type at %C",
212 gfc_current_ns->default_type[i] = *ts;
213 gfc_current_ns->implicit_loc[i] = gfc_current_locus;
214 gfc_current_ns->set_flag[i] = 1;
221 /* Given a symbol, return a pointer to the typespec for its default type. */
224 gfc_get_default_type (const char *name, gfc_namespace *ns)
230 if (gfc_option.flag_allow_leading_underscore && letter == '_')
231 gfc_internal_error ("Option -fallow-leading-underscore is for use only by "
232 "gfortran developers, and should not be used for "
233 "implicitly typed variables");
235 if (letter < 'a' || letter > 'z')
236 gfc_internal_error ("gfc_get_default_type(): Bad symbol '%s'", name);
241 return &ns->default_type[letter - 'a'];
245 /* Given a pointer to a symbol, set its type according to the first
246 letter of its name. Fails if the letter in question has no default
250 gfc_set_default_type (gfc_symbol *sym, int error_flag, gfc_namespace *ns)
254 if (sym->ts.type != BT_UNKNOWN)
255 gfc_internal_error ("gfc_set_default_type(): symbol already has a type");
257 ts = gfc_get_default_type (sym->name, ns);
259 if (ts->type == BT_UNKNOWN)
261 if (error_flag && !sym->attr.untyped)
263 gfc_error ("Symbol '%s' at %L has no IMPLICIT type",
264 sym->name, &sym->declared_at);
265 sym->attr.untyped = 1; /* Ensure we only give an error once. */
272 sym->attr.implicit_type = 1;
274 if (ts->type == BT_CHARACTER && ts->u.cl)
275 sym->ts.u.cl = gfc_new_charlen (sym->ns, ts->u.cl);
277 if (sym->attr.is_bind_c == 1)
279 /* BIND(C) variables should not be implicitly declared. */
280 gfc_warning_now ("Implicitly declared BIND(C) variable '%s' at %L may "
281 "not be C interoperable", sym->name, &sym->declared_at);
282 sym->ts.f90_type = sym->ts.type;
285 if (sym->attr.dummy != 0)
287 if (sym->ns->proc_name != NULL
288 && (sym->ns->proc_name->attr.subroutine != 0
289 || sym->ns->proc_name->attr.function != 0)
290 && sym->ns->proc_name->attr.is_bind_c != 0)
292 /* Dummy args to a BIND(C) routine may not be interoperable if
293 they are implicitly typed. */
294 gfc_warning_now ("Implicitly declared variable '%s' at %L may not "
295 "be C interoperable but it is a dummy argument to "
296 "the BIND(C) procedure '%s' at %L", sym->name,
297 &(sym->declared_at), sym->ns->proc_name->name,
298 &(sym->ns->proc_name->declared_at));
299 sym->ts.f90_type = sym->ts.type;
307 /* This function is called from parse.c(parse_progunit) to check the
308 type of the function is not implicitly typed in the host namespace
309 and to implicitly type the function result, if necessary. */
312 gfc_check_function_type (gfc_namespace *ns)
314 gfc_symbol *proc = ns->proc_name;
316 if (!proc->attr.contained || proc->result->attr.implicit_type)
319 if (proc->result->ts.type == BT_UNKNOWN && proc->result->ts.interface == NULL)
321 if (gfc_set_default_type (proc->result, 0, gfc_current_ns)
324 if (proc->result != proc)
326 proc->ts = proc->result->ts;
327 proc->as = gfc_copy_array_spec (proc->result->as);
328 proc->attr.dimension = proc->result->attr.dimension;
329 proc->attr.pointer = proc->result->attr.pointer;
330 proc->attr.allocatable = proc->result->attr.allocatable;
333 else if (!proc->result->attr.proc_pointer)
335 gfc_error ("Function result '%s' at %L has no IMPLICIT type",
336 proc->result->name, &proc->result->declared_at);
337 proc->result->attr.untyped = 1;
343 /******************** Symbol attribute stuff *********************/
345 /* This is a generic conflict-checker. We do this to avoid having a
346 single conflict in two places. */
348 #define conf(a, b) if (attr->a && attr->b) { a1 = a; a2 = b; goto conflict; }
349 #define conf2(a) if (attr->a) { a2 = a; goto conflict; }
350 #define conf_std(a, b, std) if (attr->a && attr->b)\
359 check_conflict (symbol_attribute *attr, const char *name, locus *where)
361 static const char *dummy = "DUMMY", *save = "SAVE", *pointer = "POINTER",
362 *target = "TARGET", *external = "EXTERNAL", *intent = "INTENT",
363 *intent_in = "INTENT(IN)", *intrinsic = "INTRINSIC",
364 *intent_out = "INTENT(OUT)", *intent_inout = "INTENT(INOUT)",
365 *allocatable = "ALLOCATABLE", *elemental = "ELEMENTAL",
366 *privat = "PRIVATE", *recursive = "RECURSIVE",
367 *in_common = "COMMON", *result = "RESULT", *in_namelist = "NAMELIST",
368 *publik = "PUBLIC", *optional = "OPTIONAL", *entry = "ENTRY",
369 *function = "FUNCTION", *subroutine = "SUBROUTINE",
370 *dimension = "DIMENSION", *in_equivalence = "EQUIVALENCE",
371 *use_assoc = "USE ASSOCIATED", *cray_pointer = "CRAY POINTER",
372 *cray_pointee = "CRAY POINTEE", *data = "DATA", *value = "VALUE",
373 *volatile_ = "VOLATILE", *is_protected = "PROTECTED",
374 *is_bind_c = "BIND(C)", *procedure = "PROCEDURE",
375 *asynchronous = "ASYNCHRONOUS", *codimension = "CODIMENSION",
376 *contiguous = "CONTIGUOUS", *generic = "GENERIC";
377 static const char *threadprivate = "THREADPRIVATE";
383 where = &gfc_current_locus;
385 if (attr->pointer && attr->intent != INTENT_UNKNOWN)
389 standard = GFC_STD_F2003;
393 if (attr->in_namelist && (attr->allocatable || attr->pointer))
396 a2 = attr->allocatable ? allocatable : pointer;
397 standard = GFC_STD_F2003;
401 /* Check for attributes not allowed in a BLOCK DATA. */
402 if (gfc_current_state () == COMP_BLOCK_DATA)
406 if (attr->in_namelist)
408 if (attr->allocatable)
414 if (attr->access == ACCESS_PRIVATE)
416 if (attr->access == ACCESS_PUBLIC)
418 if (attr->intent != INTENT_UNKNOWN)
424 ("%s attribute not allowed in BLOCK DATA program unit at %L",
430 if (attr->save == SAVE_EXPLICIT)
433 conf (in_common, save);
436 switch (attr->flavor)
444 a1 = gfc_code2string (flavors, attr->flavor);
449 /* Conflicts between SAVE and PROCEDURE will be checked at
450 resolution stage, see "resolve_fl_procedure". */
459 conf (dummy, intrinsic);
460 conf (dummy, threadprivate);
461 conf (pointer, target);
462 conf (pointer, intrinsic);
463 conf (pointer, elemental);
464 conf (allocatable, elemental);
466 conf (target, external);
467 conf (target, intrinsic);
469 if (!attr->if_source)
470 conf (external, dimension); /* See Fortran 95's R504. */
472 conf (external, intrinsic);
473 conf (entry, intrinsic);
475 if ((attr->if_source == IFSRC_DECL && !attr->procedure) || attr->contained)
476 conf (external, subroutine);
478 if (attr->proc_pointer && gfc_notify_std (GFC_STD_F2003,
479 "Fortran 2003: Procedure pointer at %C") == FAILURE)
482 conf (allocatable, pointer);
483 conf_std (allocatable, dummy, GFC_STD_F2003);
484 conf_std (allocatable, function, GFC_STD_F2003);
485 conf_std (allocatable, result, GFC_STD_F2003);
486 conf (elemental, recursive);
488 conf (in_common, dummy);
489 conf (in_common, allocatable);
490 conf (in_common, codimension);
491 conf (in_common, result);
493 conf (in_equivalence, use_assoc);
494 conf (in_equivalence, codimension);
495 conf (in_equivalence, dummy);
496 conf (in_equivalence, target);
497 conf (in_equivalence, pointer);
498 conf (in_equivalence, function);
499 conf (in_equivalence, result);
500 conf (in_equivalence, entry);
501 conf (in_equivalence, allocatable);
502 conf (in_equivalence, threadprivate);
504 conf (dummy, result);
505 conf (entry, result);
506 conf (generic, result);
508 conf (function, subroutine);
510 if (!function && !subroutine)
511 conf (is_bind_c, dummy);
513 conf (is_bind_c, cray_pointer);
514 conf (is_bind_c, cray_pointee);
515 conf (is_bind_c, codimension);
516 conf (is_bind_c, allocatable);
517 conf (is_bind_c, elemental);
519 /* Need to also get volatile attr, according to 5.1 of F2003 draft.
520 Parameter conflict caught below. Also, value cannot be specified
521 for a dummy procedure. */
523 /* Cray pointer/pointee conflicts. */
524 conf (cray_pointer, cray_pointee);
525 conf (cray_pointer, dimension);
526 conf (cray_pointer, codimension);
527 conf (cray_pointer, contiguous);
528 conf (cray_pointer, pointer);
529 conf (cray_pointer, target);
530 conf (cray_pointer, allocatable);
531 conf (cray_pointer, external);
532 conf (cray_pointer, intrinsic);
533 conf (cray_pointer, in_namelist);
534 conf (cray_pointer, function);
535 conf (cray_pointer, subroutine);
536 conf (cray_pointer, entry);
538 conf (cray_pointee, allocatable);
539 conf (cray_pointer, contiguous);
540 conf (cray_pointer, codimension);
541 conf (cray_pointee, intent);
542 conf (cray_pointee, optional);
543 conf (cray_pointee, dummy);
544 conf (cray_pointee, target);
545 conf (cray_pointee, intrinsic);
546 conf (cray_pointee, pointer);
547 conf (cray_pointee, entry);
548 conf (cray_pointee, in_common);
549 conf (cray_pointee, in_equivalence);
550 conf (cray_pointee, threadprivate);
553 conf (data, function);
555 conf (data, allocatable);
557 conf (value, pointer)
558 conf (value, allocatable)
559 conf (value, subroutine)
560 conf (value, function)
561 conf (value, volatile_)
562 conf (value, dimension)
563 conf (value, codimension)
564 conf (value, external)
566 conf (codimension, result)
569 && (attr->intent == INTENT_OUT || attr->intent == INTENT_INOUT))
572 a2 = attr->intent == INTENT_OUT ? intent_out : intent_inout;
576 conf (is_protected, intrinsic)
577 conf (is_protected, in_common)
579 conf (asynchronous, intrinsic)
580 conf (asynchronous, external)
582 conf (volatile_, intrinsic)
583 conf (volatile_, external)
585 if (attr->volatile_ && attr->intent == INTENT_IN)
592 conf (procedure, allocatable)
593 conf (procedure, dimension)
594 conf (procedure, codimension)
595 conf (procedure, intrinsic)
596 conf (procedure, target)
597 conf (procedure, value)
598 conf (procedure, volatile_)
599 conf (procedure, asynchronous)
600 conf (procedure, entry)
602 a1 = gfc_code2string (flavors, attr->flavor);
604 if (attr->in_namelist
605 && attr->flavor != FL_VARIABLE
606 && attr->flavor != FL_PROCEDURE
607 && attr->flavor != FL_UNKNOWN)
613 switch (attr->flavor)
623 conf2 (asynchronous);
626 conf2 (is_protected);
636 conf2 (threadprivate);
638 if (attr->access == ACCESS_PUBLIC || attr->access == ACCESS_PRIVATE)
640 a2 = attr->access == ACCESS_PUBLIC ? publik : privat;
641 gfc_error ("%s attribute applied to %s %s at %L", a2, a1,
648 gfc_error_now ("BIND(C) applied to %s %s at %L", a1, name, where);
662 /* Conflicts with INTENT, SAVE and RESULT will be checked
663 at resolution stage, see "resolve_fl_procedure". */
665 if (attr->subroutine)
671 conf2 (asynchronous);
676 if (!attr->proc_pointer)
677 conf2 (threadprivate);
680 if (!attr->proc_pointer)
685 case PROC_ST_FUNCTION:
695 conf2 (threadprivate);
715 conf2 (threadprivate);
718 if (attr->intent != INTENT_UNKNOWN)
735 conf2 (is_protected);
741 conf2 (asynchronous);
742 conf2 (threadprivate);
757 gfc_error ("%s attribute conflicts with %s attribute at %L",
760 gfc_error ("%s attribute conflicts with %s attribute in '%s' at %L",
761 a1, a2, name, where);
768 return gfc_notify_std (standard, "Fortran 2003: %s attribute "
769 "with %s attribute at %L", a1, a2,
774 return gfc_notify_std (standard, "Fortran 2003: %s attribute "
775 "with %s attribute in '%s' at %L",
776 a1, a2, name, where);
785 /* Mark a symbol as referenced. */
788 gfc_set_sym_referenced (gfc_symbol *sym)
791 if (sym->attr.referenced)
794 sym->attr.referenced = 1;
796 /* Remember which order dummy variables are accessed in. */
798 sym->dummy_order = next_dummy_order++;
802 /* Common subroutine called by attribute changing subroutines in order
803 to prevent them from changing a symbol that has been
804 use-associated. Returns zero if it is OK to change the symbol,
808 check_used (symbol_attribute *attr, const char *name, locus *where)
811 if (attr->use_assoc == 0)
815 where = &gfc_current_locus;
818 gfc_error ("Cannot change attributes of USE-associated symbol at %L",
821 gfc_error ("Cannot change attributes of USE-associated symbol %s at %L",
828 /* Generate an error because of a duplicate attribute. */
831 duplicate_attr (const char *attr, locus *where)
835 where = &gfc_current_locus;
837 gfc_error ("Duplicate %s attribute specified at %L", attr, where);
842 gfc_add_ext_attribute (symbol_attribute *attr, ext_attr_id_t ext_attr,
843 locus *where ATTRIBUTE_UNUSED)
845 attr->ext_attr |= 1 << ext_attr;
850 /* Called from decl.c (attr_decl1) to check attributes, when declared
854 gfc_add_attribute (symbol_attribute *attr, locus *where)
856 if (check_used (attr, NULL, where))
859 return check_conflict (attr, NULL, where);
864 gfc_add_allocatable (symbol_attribute *attr, locus *where)
867 if (check_used (attr, NULL, where))
870 if (attr->allocatable)
872 duplicate_attr ("ALLOCATABLE", where);
876 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
877 && gfc_find_state (COMP_INTERFACE) == FAILURE)
879 gfc_error ("ALLOCATABLE specified outside of INTERFACE body at %L",
884 attr->allocatable = 1;
885 return check_conflict (attr, NULL, where);
890 gfc_add_codimension (symbol_attribute *attr, const char *name, locus *where)
893 if (check_used (attr, name, where))
896 if (attr->codimension)
898 duplicate_attr ("CODIMENSION", where);
902 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
903 && gfc_find_state (COMP_INTERFACE) == FAILURE)
905 gfc_error ("CODIMENSION specified for '%s' outside its INTERFACE body "
906 "at %L", name, where);
910 attr->codimension = 1;
911 return check_conflict (attr, name, where);
916 gfc_add_dimension (symbol_attribute *attr, const char *name, locus *where)
919 if (check_used (attr, name, where))
924 duplicate_attr ("DIMENSION", where);
928 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
929 && gfc_find_state (COMP_INTERFACE) == FAILURE)
931 gfc_error ("DIMENSION specified for '%s' outside its INTERFACE body "
932 "at %L", name, where);
937 return check_conflict (attr, name, where);
942 gfc_add_contiguous (symbol_attribute *attr, const char *name, locus *where)
945 if (check_used (attr, name, where))
948 attr->contiguous = 1;
949 return check_conflict (attr, name, where);
954 gfc_add_external (symbol_attribute *attr, locus *where)
957 if (check_used (attr, NULL, where))
962 duplicate_attr ("EXTERNAL", where);
966 if (attr->pointer && attr->if_source != IFSRC_IFBODY)
969 attr->proc_pointer = 1;
974 return check_conflict (attr, NULL, where);
979 gfc_add_intrinsic (symbol_attribute *attr, locus *where)
982 if (check_used (attr, NULL, where))
987 duplicate_attr ("INTRINSIC", where);
993 return check_conflict (attr, NULL, where);
998 gfc_add_optional (symbol_attribute *attr, locus *where)
1001 if (check_used (attr, NULL, where))
1006 duplicate_attr ("OPTIONAL", where);
1011 return check_conflict (attr, NULL, where);
1016 gfc_add_pointer (symbol_attribute *attr, locus *where)
1019 if (check_used (attr, NULL, where))
1022 if (attr->pointer && !(attr->if_source == IFSRC_IFBODY
1023 && gfc_find_state (COMP_INTERFACE) == FAILURE))
1025 duplicate_attr ("POINTER", where);
1029 if (attr->procedure || (attr->external && attr->if_source != IFSRC_IFBODY)
1030 || (attr->if_source == IFSRC_IFBODY
1031 && gfc_find_state (COMP_INTERFACE) == FAILURE))
1032 attr->proc_pointer = 1;
1036 return check_conflict (attr, NULL, where);
1041 gfc_add_cray_pointer (symbol_attribute *attr, locus *where)
1044 if (check_used (attr, NULL, where))
1047 attr->cray_pointer = 1;
1048 return check_conflict (attr, NULL, where);
1053 gfc_add_cray_pointee (symbol_attribute *attr, locus *where)
1056 if (check_used (attr, NULL, where))
1059 if (attr->cray_pointee)
1061 gfc_error ("Cray Pointee at %L appears in multiple pointer()"
1062 " statements", where);
1066 attr->cray_pointee = 1;
1067 return check_conflict (attr, NULL, where);
1072 gfc_add_protected (symbol_attribute *attr, const char *name, locus *where)
1074 if (check_used (attr, name, where))
1077 if (attr->is_protected)
1079 if (gfc_notify_std (GFC_STD_LEGACY,
1080 "Duplicate PROTECTED attribute specified at %L",
1086 attr->is_protected = 1;
1087 return check_conflict (attr, name, where);
1092 gfc_add_result (symbol_attribute *attr, const char *name, locus *where)
1095 if (check_used (attr, name, where))
1099 return check_conflict (attr, name, where);
1104 gfc_add_save (symbol_attribute *attr, save_state s, const char *name,
1108 if (check_used (attr, name, where))
1111 if (s == SAVE_EXPLICIT && gfc_pure (NULL))
1114 ("SAVE attribute at %L cannot be specified in a PURE procedure",
1119 if (s == SAVE_EXPLICIT && gfc_implicit_pure (NULL))
1120 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1122 if (s == SAVE_EXPLICIT && attr->save == SAVE_EXPLICIT)
1124 if (gfc_notify_std (GFC_STD_LEGACY,
1125 "Duplicate SAVE attribute specified at %L",
1132 return check_conflict (attr, name, where);
1137 gfc_add_value (symbol_attribute *attr, const char *name, locus *where)
1140 if (check_used (attr, name, where))
1145 if (gfc_notify_std (GFC_STD_LEGACY,
1146 "Duplicate VALUE attribute specified at %L",
1153 return check_conflict (attr, name, where);
1158 gfc_add_volatile (symbol_attribute *attr, const char *name, locus *where)
1160 /* No check_used needed as 11.2.1 of the F2003 standard allows
1161 that the local identifier made accessible by a use statement can be
1162 given a VOLATILE attribute - unless it is a coarray (F2008, C560). */
1164 if (attr->volatile_ && attr->volatile_ns == gfc_current_ns)
1165 if (gfc_notify_std (GFC_STD_LEGACY,
1166 "Duplicate VOLATILE attribute specified at %L", where)
1170 attr->volatile_ = 1;
1171 attr->volatile_ns = gfc_current_ns;
1172 return check_conflict (attr, name, where);
1177 gfc_add_asynchronous (symbol_attribute *attr, const char *name, locus *where)
1179 /* No check_used needed as 11.2.1 of the F2003 standard allows
1180 that the local identifier made accessible by a use statement can be
1181 given a ASYNCHRONOUS attribute. */
1183 if (attr->asynchronous && attr->asynchronous_ns == gfc_current_ns)
1184 if (gfc_notify_std (GFC_STD_LEGACY,
1185 "Duplicate ASYNCHRONOUS attribute specified at %L",
1189 attr->asynchronous = 1;
1190 attr->asynchronous_ns = gfc_current_ns;
1191 return check_conflict (attr, name, where);
1196 gfc_add_threadprivate (symbol_attribute *attr, const char *name, locus *where)
1199 if (check_used (attr, name, where))
1202 if (attr->threadprivate)
1204 duplicate_attr ("THREADPRIVATE", where);
1208 attr->threadprivate = 1;
1209 return check_conflict (attr, name, where);
1214 gfc_add_target (symbol_attribute *attr, locus *where)
1217 if (check_used (attr, NULL, where))
1222 duplicate_attr ("TARGET", where);
1227 return check_conflict (attr, NULL, where);
1232 gfc_add_dummy (symbol_attribute *attr, const char *name, locus *where)
1235 if (check_used (attr, name, where))
1238 /* Duplicate dummy arguments are allowed due to ENTRY statements. */
1240 return check_conflict (attr, name, where);
1245 gfc_add_in_common (symbol_attribute *attr, const char *name, locus *where)
1248 if (check_used (attr, name, where))
1251 /* Duplicate attribute already checked for. */
1252 attr->in_common = 1;
1253 return check_conflict (attr, name, where);
1258 gfc_add_in_equivalence (symbol_attribute *attr, const char *name, locus *where)
1261 /* Duplicate attribute already checked for. */
1262 attr->in_equivalence = 1;
1263 if (check_conflict (attr, name, where) == FAILURE)
1266 if (attr->flavor == FL_VARIABLE)
1269 return gfc_add_flavor (attr, FL_VARIABLE, name, where);
1274 gfc_add_data (symbol_attribute *attr, const char *name, locus *where)
1277 if (check_used (attr, name, where))
1281 return check_conflict (attr, name, where);
1286 gfc_add_in_namelist (symbol_attribute *attr, const char *name, locus *where)
1289 attr->in_namelist = 1;
1290 return check_conflict (attr, name, where);
1295 gfc_add_sequence (symbol_attribute *attr, const char *name, locus *where)
1298 if (check_used (attr, name, where))
1302 return check_conflict (attr, name, where);
1307 gfc_add_elemental (symbol_attribute *attr, locus *where)
1310 if (check_used (attr, NULL, where))
1313 if (attr->elemental)
1315 duplicate_attr ("ELEMENTAL", where);
1319 attr->elemental = 1;
1320 return check_conflict (attr, NULL, where);
1325 gfc_add_pure (symbol_attribute *attr, locus *where)
1328 if (check_used (attr, NULL, where))
1333 duplicate_attr ("PURE", where);
1338 return check_conflict (attr, NULL, where);
1343 gfc_add_recursive (symbol_attribute *attr, locus *where)
1346 if (check_used (attr, NULL, where))
1349 if (attr->recursive)
1351 duplicate_attr ("RECURSIVE", where);
1355 attr->recursive = 1;
1356 return check_conflict (attr, NULL, where);
1361 gfc_add_entry (symbol_attribute *attr, const char *name, locus *where)
1364 if (check_used (attr, name, where))
1369 duplicate_attr ("ENTRY", where);
1374 return check_conflict (attr, name, where);
1379 gfc_add_function (symbol_attribute *attr, const char *name, locus *where)
1382 if (attr->flavor != FL_PROCEDURE
1383 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1387 return check_conflict (attr, name, where);
1392 gfc_add_subroutine (symbol_attribute *attr, const char *name, locus *where)
1395 if (attr->flavor != FL_PROCEDURE
1396 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1399 attr->subroutine = 1;
1400 return check_conflict (attr, name, where);
1405 gfc_add_generic (symbol_attribute *attr, const char *name, locus *where)
1408 if (attr->flavor != FL_PROCEDURE
1409 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1413 return check_conflict (attr, name, where);
1418 gfc_add_proc (symbol_attribute *attr, const char *name, locus *where)
1421 if (check_used (attr, NULL, where))
1424 if (attr->flavor != FL_PROCEDURE
1425 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1428 if (attr->procedure)
1430 duplicate_attr ("PROCEDURE", where);
1434 attr->procedure = 1;
1436 return check_conflict (attr, NULL, where);
1441 gfc_add_abstract (symbol_attribute* attr, locus* where)
1445 duplicate_attr ("ABSTRACT", where);
1454 /* Flavors are special because some flavors are not what Fortran
1455 considers attributes and can be reaffirmed multiple times. */
1458 gfc_add_flavor (symbol_attribute *attr, sym_flavor f, const char *name,
1462 if ((f == FL_PROGRAM || f == FL_BLOCK_DATA || f == FL_MODULE
1463 || f == FL_PARAMETER || f == FL_LABEL || f == FL_DERIVED
1464 || f == FL_NAMELIST) && check_used (attr, name, where))
1467 if (attr->flavor == f && f == FL_VARIABLE)
1470 if (attr->flavor != FL_UNKNOWN)
1473 where = &gfc_current_locus;
1476 gfc_error ("%s attribute of '%s' conflicts with %s attribute at %L",
1477 gfc_code2string (flavors, attr->flavor), name,
1478 gfc_code2string (flavors, f), where);
1480 gfc_error ("%s attribute conflicts with %s attribute at %L",
1481 gfc_code2string (flavors, attr->flavor),
1482 gfc_code2string (flavors, f), where);
1489 return check_conflict (attr, name, where);
1494 gfc_add_procedure (symbol_attribute *attr, procedure_type t,
1495 const char *name, locus *where)
1498 if (check_used (attr, name, where))
1501 if (attr->flavor != FL_PROCEDURE
1502 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1506 where = &gfc_current_locus;
1508 if (attr->proc != PROC_UNKNOWN)
1510 gfc_error ("%s procedure at %L is already declared as %s procedure",
1511 gfc_code2string (procedures, t), where,
1512 gfc_code2string (procedures, attr->proc));
1519 /* Statement functions are always scalar and functions. */
1520 if (t == PROC_ST_FUNCTION
1521 && ((!attr->function && gfc_add_function (attr, name, where) == FAILURE)
1522 || attr->dimension))
1525 return check_conflict (attr, name, where);
1530 gfc_add_intent (symbol_attribute *attr, sym_intent intent, locus *where)
1533 if (check_used (attr, NULL, where))
1536 if (attr->intent == INTENT_UNKNOWN)
1538 attr->intent = intent;
1539 return check_conflict (attr, NULL, where);
1543 where = &gfc_current_locus;
1545 gfc_error ("INTENT (%s) conflicts with INTENT(%s) at %L",
1546 gfc_intent_string (attr->intent),
1547 gfc_intent_string (intent), where);
1553 /* No checks for use-association in public and private statements. */
1556 gfc_add_access (symbol_attribute *attr, gfc_access access,
1557 const char *name, locus *where)
1560 if (attr->access == ACCESS_UNKNOWN
1561 || (attr->use_assoc && attr->access != ACCESS_PRIVATE))
1563 attr->access = access;
1564 return check_conflict (attr, name, where);
1568 where = &gfc_current_locus;
1569 gfc_error ("ACCESS specification at %L was already specified", where);
1575 /* Set the is_bind_c field for the given symbol_attribute. */
1578 gfc_add_is_bind_c (symbol_attribute *attr, const char *name, locus *where,
1579 int is_proc_lang_bind_spec)
1582 if (is_proc_lang_bind_spec == 0 && attr->flavor == FL_PROCEDURE)
1583 gfc_error_now ("BIND(C) attribute at %L can only be used for "
1584 "variables or common blocks", where);
1585 else if (attr->is_bind_c)
1586 gfc_error_now ("Duplicate BIND attribute specified at %L", where);
1588 attr->is_bind_c = 1;
1591 where = &gfc_current_locus;
1593 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BIND(C) at %L", where)
1597 return check_conflict (attr, name, where);
1601 /* Set the extension field for the given symbol_attribute. */
1604 gfc_add_extension (symbol_attribute *attr, locus *where)
1607 where = &gfc_current_locus;
1609 if (attr->extension)
1610 gfc_error_now ("Duplicate EXTENDS attribute specified at %L", where);
1612 attr->extension = 1;
1614 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: EXTENDS at %L", where)
1623 gfc_add_explicit_interface (gfc_symbol *sym, ifsrc source,
1624 gfc_formal_arglist * formal, locus *where)
1627 if (check_used (&sym->attr, sym->name, where))
1631 where = &gfc_current_locus;
1633 if (sym->attr.if_source != IFSRC_UNKNOWN
1634 && sym->attr.if_source != IFSRC_DECL)
1636 gfc_error ("Symbol '%s' at %L already has an explicit interface",
1641 if (source == IFSRC_IFBODY && (sym->attr.dimension || sym->attr.allocatable))
1643 gfc_error ("'%s' at %L has attributes specified outside its INTERFACE "
1644 "body", sym->name, where);
1648 sym->formal = formal;
1649 sym->attr.if_source = source;
1655 /* Add a type to a symbol. */
1658 gfc_add_type (gfc_symbol *sym, gfc_typespec *ts, locus *where)
1664 where = &gfc_current_locus;
1667 type = sym->result->ts.type;
1669 type = sym->ts.type;
1671 if (sym->attr.result && type == BT_UNKNOWN && sym->ns->proc_name)
1672 type = sym->ns->proc_name->ts.type;
1674 if (type != BT_UNKNOWN && !(sym->attr.function && sym->attr.implicit_type))
1676 if (sym->attr.use_assoc)
1677 gfc_error ("Symbol '%s' at %L conflicts with symbol from module '%s', "
1678 "use-associated at %L", sym->name, where, sym->module,
1681 gfc_error ("Symbol '%s' at %L already has basic type of %s", sym->name,
1682 where, gfc_basic_typename (type));
1686 if (sym->attr.procedure && sym->ts.interface)
1688 gfc_error ("Procedure '%s' at %L may not have basic type of %s",
1689 sym->name, where, gfc_basic_typename (ts->type));
1693 flavor = sym->attr.flavor;
1695 if (flavor == FL_PROGRAM || flavor == FL_BLOCK_DATA || flavor == FL_MODULE
1696 || flavor == FL_LABEL
1697 || (flavor == FL_PROCEDURE && sym->attr.subroutine)
1698 || flavor == FL_DERIVED || flavor == FL_NAMELIST)
1700 gfc_error ("Symbol '%s' at %L cannot have a type", sym->name, where);
1709 /* Clears all attributes. */
1712 gfc_clear_attr (symbol_attribute *attr)
1714 memset (attr, 0, sizeof (symbol_attribute));
1718 /* Check for missing attributes in the new symbol. Currently does
1719 nothing, but it's not clear that it is unnecessary yet. */
1722 gfc_missing_attr (symbol_attribute *attr ATTRIBUTE_UNUSED,
1723 locus *where ATTRIBUTE_UNUSED)
1730 /* Copy an attribute to a symbol attribute, bit by bit. Some
1731 attributes have a lot of side-effects but cannot be present given
1732 where we are called from, so we ignore some bits. */
1735 gfc_copy_attr (symbol_attribute *dest, symbol_attribute *src, locus *where)
1737 int is_proc_lang_bind_spec;
1739 /* In line with the other attributes, we only add bits but do not remove
1740 them; cf. also PR 41034. */
1741 dest->ext_attr |= src->ext_attr;
1743 if (src->allocatable && gfc_add_allocatable (dest, where) == FAILURE)
1746 if (src->dimension && gfc_add_dimension (dest, NULL, where) == FAILURE)
1748 if (src->codimension && gfc_add_codimension (dest, NULL, where) == FAILURE)
1750 if (src->contiguous && gfc_add_contiguous (dest, NULL, where) == FAILURE)
1752 if (src->optional && gfc_add_optional (dest, where) == FAILURE)
1754 if (src->pointer && gfc_add_pointer (dest, where) == FAILURE)
1756 if (src->is_protected && gfc_add_protected (dest, NULL, where) == FAILURE)
1758 if (src->save && gfc_add_save (dest, src->save, NULL, where) == FAILURE)
1760 if (src->value && gfc_add_value (dest, NULL, where) == FAILURE)
1762 if (src->volatile_ && gfc_add_volatile (dest, NULL, where) == FAILURE)
1764 if (src->asynchronous && gfc_add_asynchronous (dest, NULL, where) == FAILURE)
1766 if (src->threadprivate
1767 && gfc_add_threadprivate (dest, NULL, where) == FAILURE)
1769 if (src->target && gfc_add_target (dest, where) == FAILURE)
1771 if (src->dummy && gfc_add_dummy (dest, NULL, where) == FAILURE)
1773 if (src->result && gfc_add_result (dest, NULL, where) == FAILURE)
1778 if (src->in_namelist && gfc_add_in_namelist (dest, NULL, where) == FAILURE)
1781 if (src->in_common && gfc_add_in_common (dest, NULL, where) == FAILURE)
1784 if (src->generic && gfc_add_generic (dest, NULL, where) == FAILURE)
1786 if (src->function && gfc_add_function (dest, NULL, where) == FAILURE)
1788 if (src->subroutine && gfc_add_subroutine (dest, NULL, where) == FAILURE)
1791 if (src->sequence && gfc_add_sequence (dest, NULL, where) == FAILURE)
1793 if (src->elemental && gfc_add_elemental (dest, where) == FAILURE)
1795 if (src->pure && gfc_add_pure (dest, where) == FAILURE)
1797 if (src->recursive && gfc_add_recursive (dest, where) == FAILURE)
1800 if (src->flavor != FL_UNKNOWN
1801 && gfc_add_flavor (dest, src->flavor, NULL, where) == FAILURE)
1804 if (src->intent != INTENT_UNKNOWN
1805 && gfc_add_intent (dest, src->intent, where) == FAILURE)
1808 if (src->access != ACCESS_UNKNOWN
1809 && gfc_add_access (dest, src->access, NULL, where) == FAILURE)
1812 if (gfc_missing_attr (dest, where) == FAILURE)
1815 if (src->cray_pointer && gfc_add_cray_pointer (dest, where) == FAILURE)
1817 if (src->cray_pointee && gfc_add_cray_pointee (dest, where) == FAILURE)
1820 is_proc_lang_bind_spec = (src->flavor == FL_PROCEDURE ? 1 : 0);
1822 && gfc_add_is_bind_c (dest, NULL, where, is_proc_lang_bind_spec)
1826 if (src->is_c_interop)
1827 dest->is_c_interop = 1;
1831 if (src->external && gfc_add_external (dest, where) == FAILURE)
1833 if (src->intrinsic && gfc_add_intrinsic (dest, where) == FAILURE)
1835 if (src->proc_pointer)
1836 dest->proc_pointer = 1;
1845 /************** Component name management ************/
1847 /* Component names of a derived type form their own little namespaces
1848 that are separate from all other spaces. The space is composed of
1849 a singly linked list of gfc_component structures whose head is
1850 located in the parent symbol. */
1853 /* Add a component name to a symbol. The call fails if the name is
1854 already present. On success, the component pointer is modified to
1855 point to the additional component structure. */
1858 gfc_add_component (gfc_symbol *sym, const char *name,
1859 gfc_component **component)
1861 gfc_component *p, *tail;
1865 for (p = sym->components; p; p = p->next)
1867 if (strcmp (p->name, name) == 0)
1869 gfc_error ("Component '%s' at %C already declared at %L",
1877 if (sym->attr.extension
1878 && gfc_find_component (sym->components->ts.u.derived, name, true, true))
1880 gfc_error ("Component '%s' at %C already in the parent type "
1881 "at %L", name, &sym->components->ts.u.derived->declared_at);
1885 /* Allocate a new component. */
1886 p = gfc_get_component ();
1889 sym->components = p;
1893 p->name = gfc_get_string (name);
1894 p->loc = gfc_current_locus;
1895 p->ts.type = BT_UNKNOWN;
1902 /* Recursive function to switch derived types of all symbol in a
1906 switch_types (gfc_symtree *st, gfc_symbol *from, gfc_symbol *to)
1914 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived == from)
1915 sym->ts.u.derived = to;
1917 switch_types (st->left, from, to);
1918 switch_types (st->right, from, to);
1922 /* This subroutine is called when a derived type is used in order to
1923 make the final determination about which version to use. The
1924 standard requires that a type be defined before it is 'used', but
1925 such types can appear in IMPLICIT statements before the actual
1926 definition. 'Using' in this context means declaring a variable to
1927 be that type or using the type constructor.
1929 If a type is used and the components haven't been defined, then we
1930 have to have a derived type in a parent unit. We find the node in
1931 the other namespace and point the symtree node in this namespace to
1932 that node. Further reference to this name point to the correct
1933 node. If we can't find the node in a parent namespace, then we have
1936 This subroutine takes a pointer to a symbol node and returns a
1937 pointer to the translated node or NULL for an error. Usually there
1938 is no translation and we return the node we were passed. */
1941 gfc_use_derived (gfc_symbol *sym)
1951 if (sym->components != NULL || sym->attr.zero_comp)
1952 return sym; /* Already defined. */
1954 if (sym->ns->parent == NULL)
1957 if (gfc_find_symbol (sym->name, sym->ns->parent, 1, &s))
1959 gfc_error ("Symbol '%s' at %C is ambiguous", sym->name);
1963 if (s == NULL || s->attr.flavor != FL_DERIVED)
1966 /* Get rid of symbol sym, translating all references to s. */
1967 for (i = 0; i < GFC_LETTERS; i++)
1969 t = &sym->ns->default_type[i];
1970 if (t->u.derived == sym)
1974 st = gfc_find_symtree (sym->ns->sym_root, sym->name);
1979 /* Unlink from list of modified symbols. */
1980 gfc_commit_symbol (sym);
1982 switch_types (sym->ns->sym_root, sym, s);
1984 /* TODO: Also have to replace sym -> s in other lists like
1985 namelists, common lists and interface lists. */
1986 gfc_free_symbol (sym);
1991 gfc_error ("Derived type '%s' at %C is being used before it is defined",
1997 /* Given a derived type node and a component name, try to locate the
1998 component structure. Returns the NULL pointer if the component is
1999 not found or the components are private. If noaccess is set, no access
2003 gfc_find_component (gfc_symbol *sym, const char *name,
2004 bool noaccess, bool silent)
2008 if (name == NULL || sym == NULL)
2011 sym = gfc_use_derived (sym);
2016 for (p = sym->components; p; p = p->next)
2017 if (strcmp (p->name, name) == 0)
2021 && sym->attr.extension
2022 && sym->components->ts.type == BT_DERIVED)
2024 p = gfc_find_component (sym->components->ts.u.derived, name,
2026 /* Do not overwrite the error. */
2031 if (p == NULL && !silent)
2032 gfc_error ("'%s' at %C is not a member of the '%s' structure",
2035 else if (sym->attr.use_assoc && !noaccess)
2037 bool is_parent_comp = sym->attr.extension && (p == sym->components);
2038 if (p->attr.access == ACCESS_PRIVATE ||
2039 (p->attr.access != ACCESS_PUBLIC
2040 && sym->component_access == ACCESS_PRIVATE
2041 && !is_parent_comp))
2044 gfc_error ("Component '%s' at %C is a PRIVATE component of '%s'",
2054 /* Given a symbol, free all of the component structures and everything
2058 free_components (gfc_component *p)
2066 gfc_free_array_spec (p->as);
2067 gfc_free_expr (p->initializer);
2069 gfc_free_formal_arglist (p->formal);
2070 gfc_free_namespace (p->formal_ns);
2077 /******************** Statement label management ********************/
2079 /* Comparison function for statement labels, used for managing the
2083 compare_st_labels (void *a1, void *b1)
2085 int a = ((gfc_st_label *) a1)->value;
2086 int b = ((gfc_st_label *) b1)->value;
2092 /* Free a single gfc_st_label structure, making sure the tree is not
2093 messed up. This function is called only when some parse error
2097 gfc_free_st_label (gfc_st_label *label)
2103 gfc_delete_bbt (&gfc_current_ns->st_labels, label, compare_st_labels);
2105 if (label->format != NULL)
2106 gfc_free_expr (label->format);
2112 /* Free a whole tree of gfc_st_label structures. */
2115 free_st_labels (gfc_st_label *label)
2121 free_st_labels (label->left);
2122 free_st_labels (label->right);
2124 if (label->format != NULL)
2125 gfc_free_expr (label->format);
2130 /* Given a label number, search for and return a pointer to the label
2131 structure, creating it if it does not exist. */
2134 gfc_get_st_label (int labelno)
2139 if (gfc_current_state () == COMP_DERIVED)
2140 ns = gfc_current_block ()->f2k_derived;
2143 /* Find the namespace of the scoping unit:
2144 If we're in a BLOCK construct, jump to the parent namespace. */
2145 ns = gfc_current_ns;
2146 while (ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL)
2150 /* First see if the label is already in this namespace. */
2154 if (lp->value == labelno)
2157 if (lp->value < labelno)
2163 lp = XCNEW (gfc_st_label);
2165 lp->value = labelno;
2166 lp->defined = ST_LABEL_UNKNOWN;
2167 lp->referenced = ST_LABEL_UNKNOWN;
2169 gfc_insert_bbt (&ns->st_labels, lp, compare_st_labels);
2175 /* Called when a statement with a statement label is about to be
2176 accepted. We add the label to the list of the current namespace,
2177 making sure it hasn't been defined previously and referenced
2181 gfc_define_st_label (gfc_st_label *lp, gfc_sl_type type, locus *label_locus)
2185 labelno = lp->value;
2187 if (lp->defined != ST_LABEL_UNKNOWN)
2188 gfc_error ("Duplicate statement label %d at %L and %L", labelno,
2189 &lp->where, label_locus);
2192 lp->where = *label_locus;
2196 case ST_LABEL_FORMAT:
2197 if (lp->referenced == ST_LABEL_TARGET)
2198 gfc_error ("Label %d at %C already referenced as branch target",
2201 lp->defined = ST_LABEL_FORMAT;
2205 case ST_LABEL_TARGET:
2206 if (lp->referenced == ST_LABEL_FORMAT)
2207 gfc_error ("Label %d at %C already referenced as a format label",
2210 lp->defined = ST_LABEL_TARGET;
2215 lp->defined = ST_LABEL_BAD_TARGET;
2216 lp->referenced = ST_LABEL_BAD_TARGET;
2222 /* Reference a label. Given a label and its type, see if that
2223 reference is consistent with what is known about that label,
2224 updating the unknown state. Returns FAILURE if something goes
2228 gfc_reference_st_label (gfc_st_label *lp, gfc_sl_type type)
2230 gfc_sl_type label_type;
2237 labelno = lp->value;
2239 if (lp->defined != ST_LABEL_UNKNOWN)
2240 label_type = lp->defined;
2243 label_type = lp->referenced;
2244 lp->where = gfc_current_locus;
2247 if (label_type == ST_LABEL_FORMAT && type == ST_LABEL_TARGET)
2249 gfc_error ("Label %d at %C previously used as a FORMAT label", labelno);
2254 if ((label_type == ST_LABEL_TARGET || label_type == ST_LABEL_BAD_TARGET)
2255 && type == ST_LABEL_FORMAT)
2257 gfc_error ("Label %d at %C previously used as branch target", labelno);
2262 lp->referenced = type;
2270 /************** Symbol table management subroutines ****************/
2272 /* Basic details: Fortran 95 requires a potentially unlimited number
2273 of distinct namespaces when compiling a program unit. This case
2274 occurs during a compilation of internal subprograms because all of
2275 the internal subprograms must be read before we can start
2276 generating code for the host.
2278 Given the tricky nature of the Fortran grammar, we must be able to
2279 undo changes made to a symbol table if the current interpretation
2280 of a statement is found to be incorrect. Whenever a symbol is
2281 looked up, we make a copy of it and link to it. All of these
2282 symbols are kept in a singly linked list so that we can commit or
2283 undo the changes at a later time.
2285 A symtree may point to a symbol node outside of its namespace. In
2286 this case, that symbol has been used as a host associated variable
2287 at some previous time. */
2289 /* Allocate a new namespace structure. Copies the implicit types from
2290 PARENT if PARENT_TYPES is set. */
2293 gfc_get_namespace (gfc_namespace *parent, int parent_types)
2300 ns = XCNEW (gfc_namespace);
2301 ns->sym_root = NULL;
2302 ns->uop_root = NULL;
2303 ns->tb_sym_root = NULL;
2304 ns->finalizers = NULL;
2305 ns->default_access = ACCESS_UNKNOWN;
2306 ns->parent = parent;
2308 for (in = GFC_INTRINSIC_BEGIN; in != GFC_INTRINSIC_END; in++)
2310 ns->operator_access[in] = ACCESS_UNKNOWN;
2311 ns->tb_op[in] = NULL;
2314 /* Initialize default implicit types. */
2315 for (i = 'a'; i <= 'z'; i++)
2317 ns->set_flag[i - 'a'] = 0;
2318 ts = &ns->default_type[i - 'a'];
2320 if (parent_types && ns->parent != NULL)
2322 /* Copy parent settings. */
2323 *ts = ns->parent->default_type[i - 'a'];
2327 if (gfc_option.flag_implicit_none != 0)
2333 if ('i' <= i && i <= 'n')
2335 ts->type = BT_INTEGER;
2336 ts->kind = gfc_default_integer_kind;
2341 ts->kind = gfc_default_real_kind;
2351 /* Comparison function for symtree nodes. */
2354 compare_symtree (void *_st1, void *_st2)
2356 gfc_symtree *st1, *st2;
2358 st1 = (gfc_symtree *) _st1;
2359 st2 = (gfc_symtree *) _st2;
2361 return strcmp (st1->name, st2->name);
2365 /* Allocate a new symtree node and associate it with the new symbol. */
2368 gfc_new_symtree (gfc_symtree **root, const char *name)
2372 st = XCNEW (gfc_symtree);
2373 st->name = gfc_get_string (name);
2375 gfc_insert_bbt (root, st, compare_symtree);
2380 /* Delete a symbol from the tree. Does not free the symbol itself! */
2383 gfc_delete_symtree (gfc_symtree **root, const char *name)
2385 gfc_symtree st, *st0;
2387 st0 = gfc_find_symtree (*root, name);
2389 st.name = gfc_get_string (name);
2390 gfc_delete_bbt (root, &st, compare_symtree);
2396 /* Given a root symtree node and a name, try to find the symbol within
2397 the namespace. Returns NULL if the symbol is not found. */
2400 gfc_find_symtree (gfc_symtree *st, const char *name)
2406 c = strcmp (name, st->name);
2410 st = (c < 0) ? st->left : st->right;
2417 /* Return a symtree node with a name that is guaranteed to be unique
2418 within the namespace and corresponds to an illegal fortran name. */
2421 gfc_get_unique_symtree (gfc_namespace *ns)
2423 char name[GFC_MAX_SYMBOL_LEN + 1];
2424 static int serial = 0;
2426 sprintf (name, "@%d", serial++);
2427 return gfc_new_symtree (&ns->sym_root, name);
2431 /* Given a name find a user operator node, creating it if it doesn't
2432 exist. These are much simpler than symbols because they can't be
2433 ambiguous with one another. */
2436 gfc_get_uop (const char *name)
2441 st = gfc_find_symtree (gfc_current_ns->uop_root, name);
2445 st = gfc_new_symtree (&gfc_current_ns->uop_root, name);
2447 uop = st->n.uop = XCNEW (gfc_user_op);
2448 uop->name = gfc_get_string (name);
2449 uop->access = ACCESS_UNKNOWN;
2450 uop->ns = gfc_current_ns;
2456 /* Given a name find the user operator node. Returns NULL if it does
2460 gfc_find_uop (const char *name, gfc_namespace *ns)
2465 ns = gfc_current_ns;
2467 st = gfc_find_symtree (ns->uop_root, name);
2468 return (st == NULL) ? NULL : st->n.uop;
2472 /* Remove a gfc_symbol structure and everything it points to. */
2475 gfc_free_symbol (gfc_symbol *sym)
2481 gfc_free_array_spec (sym->as);
2483 free_components (sym->components);
2485 gfc_free_expr (sym->value);
2487 gfc_free_namelist (sym->namelist);
2489 gfc_free_namespace (sym->formal_ns);
2491 if (!sym->attr.generic_copy)
2492 gfc_free_interface (sym->generic);
2494 gfc_free_formal_arglist (sym->formal);
2496 gfc_free_namespace (sym->f2k_derived);
2502 /* Decrease the reference counter and free memory when we reach zero. */
2505 gfc_release_symbol (gfc_symbol *sym)
2510 if (sym->formal_ns != NULL && sym->refs == 2)
2512 /* As formal_ns contains a reference to sym, delete formal_ns just
2513 before the deletion of sym. */
2514 gfc_namespace *ns = sym->formal_ns;
2515 sym->formal_ns = NULL;
2516 gfc_free_namespace (ns);
2523 gcc_assert (sym->refs == 0);
2524 gfc_free_symbol (sym);
2528 /* Allocate and initialize a new symbol node. */
2531 gfc_new_symbol (const char *name, gfc_namespace *ns)
2535 p = XCNEW (gfc_symbol);
2537 gfc_clear_ts (&p->ts);
2538 gfc_clear_attr (&p->attr);
2541 p->declared_at = gfc_current_locus;
2543 if (strlen (name) > GFC_MAX_SYMBOL_LEN)
2544 gfc_internal_error ("new_symbol(): Symbol name too long");
2546 p->name = gfc_get_string (name);
2548 /* Make sure flags for symbol being C bound are clear initially. */
2549 p->attr.is_bind_c = 0;
2550 p->attr.is_iso_c = 0;
2551 /* Make sure the binding label field has a Nul char to start. */
2552 p->binding_label[0] = '\0';
2554 /* Clear the ptrs we may need. */
2555 p->common_block = NULL;
2556 p->f2k_derived = NULL;
2563 /* Generate an error if a symbol is ambiguous. */
2566 ambiguous_symbol (const char *name, gfc_symtree *st)
2569 if (st->n.sym->module)
2570 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2571 "from module '%s'", name, st->n.sym->name, st->n.sym->module);
2573 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2574 "from current program unit", name, st->n.sym->name);
2578 /* If we're in a SELECT TYPE block, check if the variable 'st' matches any
2579 selector on the stack. If yes, replace it by the corresponding temporary. */
2582 select_type_insert_tmp (gfc_symtree **st)
2584 gfc_select_type_stack *stack = select_type_stack;
2585 for (; stack; stack = stack->prev)
2586 if ((*st)->n.sym == stack->selector && stack->tmp)
2591 /* Look for a symtree in the current procedure -- that is, go up to
2592 parent namespaces but only if inside a BLOCK. Returns NULL if not found. */
2595 gfc_find_symtree_in_proc (const char* name, gfc_namespace* ns)
2599 gfc_symtree* st = gfc_find_symtree (ns->sym_root, name);
2603 if (!ns->construct_entities)
2612 /* Search for a symtree starting in the current namespace, resorting to
2613 any parent namespaces if requested by a nonzero parent_flag.
2614 Returns nonzero if the name is ambiguous. */
2617 gfc_find_sym_tree (const char *name, gfc_namespace *ns, int parent_flag,
2618 gfc_symtree **result)
2623 ns = gfc_current_ns;
2627 st = gfc_find_symtree (ns->sym_root, name);
2630 select_type_insert_tmp (&st);
2633 /* Ambiguous generic interfaces are permitted, as long
2634 as the specific interfaces are different. */
2635 if (st->ambiguous && !st->n.sym->attr.generic)
2637 ambiguous_symbol (name, st);
2656 /* Same, but returns the symbol instead. */
2659 gfc_find_symbol (const char *name, gfc_namespace *ns, int parent_flag,
2660 gfc_symbol **result)
2665 i = gfc_find_sym_tree (name, ns, parent_flag, &st);
2670 *result = st->n.sym;
2676 /* Save symbol with the information necessary to back it out. */
2679 save_symbol_data (gfc_symbol *sym)
2682 if (sym->gfc_new || sym->old_symbol != NULL)
2685 sym->old_symbol = XCNEW (gfc_symbol);
2686 *(sym->old_symbol) = *sym;
2688 sym->tlink = changed_syms;
2693 /* Given a name, find a symbol, or create it if it does not exist yet
2694 in the current namespace. If the symbol is found we make sure that
2697 The integer return code indicates
2699 1 The symbol name was ambiguous
2700 2 The name meant to be established was already host associated.
2702 So if the return value is nonzero, then an error was issued. */
2705 gfc_get_sym_tree (const char *name, gfc_namespace *ns, gfc_symtree **result,
2706 bool allow_subroutine)
2711 /* This doesn't usually happen during resolution. */
2713 ns = gfc_current_ns;
2715 /* Try to find the symbol in ns. */
2716 st = gfc_find_symtree (ns->sym_root, name);
2720 /* If not there, create a new symbol. */
2721 p = gfc_new_symbol (name, ns);
2723 /* Add to the list of tentative symbols. */
2724 p->old_symbol = NULL;
2725 p->tlink = changed_syms;
2730 st = gfc_new_symtree (&ns->sym_root, name);
2737 /* Make sure the existing symbol is OK. Ambiguous
2738 generic interfaces are permitted, as long as the
2739 specific interfaces are different. */
2740 if (st->ambiguous && !st->n.sym->attr.generic)
2742 ambiguous_symbol (name, st);
2747 if (p->ns != ns && (!p->attr.function || ns->proc_name != p)
2748 && !(allow_subroutine && p->attr.subroutine)
2749 && !(ns->proc_name && ns->proc_name->attr.if_source == IFSRC_IFBODY
2750 && (ns->has_import_set || p->attr.imported)))
2752 /* Symbol is from another namespace. */
2753 gfc_error ("Symbol '%s' at %C has already been host associated",
2760 /* Copy in case this symbol is changed. */
2761 save_symbol_data (p);
2770 gfc_get_symbol (const char *name, gfc_namespace *ns, gfc_symbol **result)
2775 i = gfc_get_sym_tree (name, ns, &st, false);
2780 *result = st->n.sym;
2787 /* Subroutine that searches for a symbol, creating it if it doesn't
2788 exist, but tries to host-associate the symbol if possible. */
2791 gfc_get_ha_sym_tree (const char *name, gfc_symtree **result)
2796 i = gfc_find_sym_tree (name, gfc_current_ns, 0, &st);
2800 save_symbol_data (st->n.sym);
2805 if (gfc_current_ns->parent != NULL)
2807 i = gfc_find_sym_tree (name, gfc_current_ns->parent, 1, &st);
2818 return gfc_get_sym_tree (name, gfc_current_ns, result, false);
2823 gfc_get_ha_symbol (const char *name, gfc_symbol **result)
2828 i = gfc_get_ha_sym_tree (name, &st);
2831 *result = st->n.sym;
2838 /* Undoes all the changes made to symbols in the current statement.
2839 This subroutine is made simpler due to the fact that attributes are
2840 never removed once added. */
2843 gfc_undo_symbols (void)
2845 gfc_symbol *p, *q, *old;
2846 tentative_tbp *tbp, *tbq;
2848 for (p = changed_syms; p; p = q)
2854 /* Symbol was new. */
2855 if (p->attr.in_common && p->common_block && p->common_block->head)
2857 /* If the symbol was added to any common block, it
2858 needs to be removed to stop the resolver looking
2859 for a (possibly) dead symbol. */
2861 if (p->common_block->head == p)
2862 p->common_block->head = p->common_next;
2865 gfc_symbol *cparent, *csym;
2867 cparent = p->common_block->head;
2868 csym = cparent->common_next;
2873 csym = csym->common_next;
2876 gcc_assert(cparent->common_next == p);
2878 cparent->common_next = csym->common_next;
2882 gfc_delete_symtree (&p->ns->sym_root, p->name);
2884 gfc_release_symbol (p);
2888 /* Restore previous state of symbol. Just copy simple stuff. */
2890 old = p->old_symbol;
2892 p->ts.type = old->ts.type;
2893 p->ts.kind = old->ts.kind;
2895 p->attr = old->attr;
2897 if (p->value != old->value)
2899 gfc_free_expr (old->value);
2903 if (p->as != old->as)
2906 gfc_free_array_spec (p->as);
2910 p->generic = old->generic;
2911 p->component_access = old->component_access;
2913 if (p->namelist != NULL && old->namelist == NULL)
2915 gfc_free_namelist (p->namelist);
2920 if (p->namelist_tail != old->namelist_tail)
2922 gfc_free_namelist (old->namelist_tail);
2923 old->namelist_tail->next = NULL;
2927 p->namelist_tail = old->namelist_tail;
2929 if (p->formal != old->formal)
2931 gfc_free_formal_arglist (p->formal);
2932 p->formal = old->formal;
2935 free (p->old_symbol);
2936 p->old_symbol = NULL;
2940 changed_syms = NULL;
2942 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
2945 /* Procedure is already marked `error' by default. */
2948 tentative_tbp_list = NULL;
2952 /* Free sym->old_symbol. sym->old_symbol is mostly a shallow copy of sym; the
2953 components of old_symbol that might need deallocation are the "allocatables"
2954 that are restored in gfc_undo_symbols(), with two exceptions: namelist and
2955 namelist_tail. In case these differ between old_symbol and sym, it's just
2956 because sym->namelist has gotten a few more items. */
2959 free_old_symbol (gfc_symbol *sym)
2962 if (sym->old_symbol == NULL)
2965 if (sym->old_symbol->as != sym->as)
2966 gfc_free_array_spec (sym->old_symbol->as);
2968 if (sym->old_symbol->value != sym->value)
2969 gfc_free_expr (sym->old_symbol->value);
2971 if (sym->old_symbol->formal != sym->formal)
2972 gfc_free_formal_arglist (sym->old_symbol->formal);
2974 free (sym->old_symbol);
2975 sym->old_symbol = NULL;
2979 /* Makes the changes made in the current statement permanent-- gets
2980 rid of undo information. */
2983 gfc_commit_symbols (void)
2986 tentative_tbp *tbp, *tbq;
2988 for (p = changed_syms; p; p = q)
2994 free_old_symbol (p);
2996 changed_syms = NULL;
2998 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
3001 tbp->proc->error = 0;
3004 tentative_tbp_list = NULL;
3008 /* Makes the changes made in one symbol permanent -- gets rid of undo
3012 gfc_commit_symbol (gfc_symbol *sym)
3016 if (changed_syms == sym)
3017 changed_syms = sym->tlink;
3020 for (p = changed_syms; p; p = p->tlink)
3021 if (p->tlink == sym)
3023 p->tlink = sym->tlink;
3032 free_old_symbol (sym);
3036 /* Recursively free trees containing type-bound procedures. */
3039 free_tb_tree (gfc_symtree *t)
3044 free_tb_tree (t->left);
3045 free_tb_tree (t->right);
3047 /* TODO: Free type-bound procedure structs themselves; probably needs some
3048 sort of ref-counting mechanism. */
3054 /* Recursive function that deletes an entire tree and all the common
3055 head structures it points to. */
3058 free_common_tree (gfc_symtree * common_tree)
3060 if (common_tree == NULL)
3063 free_common_tree (common_tree->left);
3064 free_common_tree (common_tree->right);
3070 /* Recursive function that deletes an entire tree and all the user
3071 operator nodes that it contains. */
3074 free_uop_tree (gfc_symtree *uop_tree)
3076 if (uop_tree == NULL)
3079 free_uop_tree (uop_tree->left);
3080 free_uop_tree (uop_tree->right);
3082 gfc_free_interface (uop_tree->n.uop->op);
3083 free (uop_tree->n.uop);
3088 /* Recursive function that deletes an entire tree and all the symbols
3089 that it contains. */
3092 free_sym_tree (gfc_symtree *sym_tree)
3094 if (sym_tree == NULL)
3097 free_sym_tree (sym_tree->left);
3098 free_sym_tree (sym_tree->right);
3100 gfc_release_symbol (sym_tree->n.sym);
3105 /* Free the derived type list. */
3108 gfc_free_dt_list (void)
3110 gfc_dt_list *dt, *n;
3112 for (dt = gfc_derived_types; dt; dt = n)
3118 gfc_derived_types = NULL;
3122 /* Free the gfc_equiv_info's. */
3125 gfc_free_equiv_infos (gfc_equiv_info *s)
3129 gfc_free_equiv_infos (s->next);
3134 /* Free the gfc_equiv_lists. */
3137 gfc_free_equiv_lists (gfc_equiv_list *l)
3141 gfc_free_equiv_lists (l->next);
3142 gfc_free_equiv_infos (l->equiv);
3147 /* Free a finalizer procedure list. */
3150 gfc_free_finalizer (gfc_finalizer* el)
3154 gfc_release_symbol (el->proc_sym);
3160 gfc_free_finalizer_list (gfc_finalizer* list)
3164 gfc_finalizer* current = list;
3166 gfc_free_finalizer (current);
3171 /* Create a new gfc_charlen structure and add it to a namespace.
3172 If 'old_cl' is given, the newly created charlen will be a copy of it. */
3175 gfc_new_charlen (gfc_namespace *ns, gfc_charlen *old_cl)
3178 cl = gfc_get_charlen ();
3183 /* Put into namespace, but don't allow reject_statement
3184 to free it if old_cl is given. */
3185 gfc_charlen **prev = &ns->cl_list;
3186 cl->next = ns->old_cl_list;
3187 while (*prev != ns->old_cl_list)
3188 prev = &(*prev)->next;
3190 ns->old_cl_list = cl;
3191 cl->length = gfc_copy_expr (old_cl->length);
3192 cl->length_from_typespec = old_cl->length_from_typespec;
3193 cl->backend_decl = old_cl->backend_decl;
3194 cl->passed_length = old_cl->passed_length;
3195 cl->resolved = old_cl->resolved;
3199 /* Put into namespace. */
3200 cl->next = ns->cl_list;
3208 /* Free the charlen list from cl to end (end is not freed).
3209 Free the whole list if end is NULL. */
3211 void gfc_free_charlen (gfc_charlen *cl, gfc_charlen *end)
3215 for (; cl != end; cl = cl2)
3220 gfc_free_expr (cl->length);
3226 /* Free entry list structs. */
3229 free_entry_list (gfc_entry_list *el)
3231 gfc_entry_list *next;
3238 free_entry_list (next);
3242 /* Free a namespace structure and everything below it. Interface
3243 lists associated with intrinsic operators are not freed. These are
3244 taken care of when a specific name is freed. */
3247 gfc_free_namespace (gfc_namespace *ns)
3249 gfc_namespace *p, *q;
3258 gcc_assert (ns->refs == 0);
3260 gfc_free_statements (ns->code);
3262 free_sym_tree (ns->sym_root);
3263 free_uop_tree (ns->uop_root);
3264 free_common_tree (ns->common_root);
3265 free_tb_tree (ns->tb_sym_root);
3266 free_tb_tree (ns->tb_uop_root);
3267 gfc_free_finalizer_list (ns->finalizers);
3268 gfc_free_charlen (ns->cl_list, NULL);
3269 free_st_labels (ns->st_labels);
3271 free_entry_list (ns->entries);
3272 gfc_free_equiv (ns->equiv);
3273 gfc_free_equiv_lists (ns->equiv_lists);
3274 gfc_free_use_stmts (ns->use_stmts);
3276 for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++)
3277 gfc_free_interface (ns->op[i]);
3279 gfc_free_data (ns->data);
3283 /* Recursively free any contained namespaces. */
3288 gfc_free_namespace (q);
3294 gfc_symbol_init_2 (void)
3297 gfc_current_ns = gfc_get_namespace (NULL, 0);
3302 gfc_symbol_done_2 (void)
3305 gfc_free_namespace (gfc_current_ns);
3306 gfc_current_ns = NULL;
3307 gfc_free_dt_list ();
3311 /* Clear mark bits from symbol nodes associated with a symtree node. */
3314 clear_sym_mark (gfc_symtree *st)
3317 st->n.sym->mark = 0;
3321 /* Recursively traverse the symtree nodes. */
3324 gfc_traverse_symtree (gfc_symtree *st, void (*func) (gfc_symtree *))
3329 gfc_traverse_symtree (st->left, func);
3331 gfc_traverse_symtree (st->right, func);
3335 /* Recursive namespace traversal function. */
3338 traverse_ns (gfc_symtree *st, void (*func) (gfc_symbol *))
3344 traverse_ns (st->left, func);
3346 if (st->n.sym->mark == 0)
3347 (*func) (st->n.sym);
3348 st->n.sym->mark = 1;
3350 traverse_ns (st->right, func);
3354 /* Call a given function for all symbols in the namespace. We take
3355 care that each gfc_symbol node is called exactly once. */
3358 gfc_traverse_ns (gfc_namespace *ns, void (*func) (gfc_symbol *))
3361 gfc_traverse_symtree (ns->sym_root, clear_sym_mark);
3363 traverse_ns (ns->sym_root, func);
3367 /* Return TRUE when name is the name of an intrinsic type. */
3370 gfc_is_intrinsic_typename (const char *name)
3372 if (strcmp (name, "integer") == 0
3373 || strcmp (name, "real") == 0
3374 || strcmp (name, "character") == 0
3375 || strcmp (name, "logical") == 0
3376 || strcmp (name, "complex") == 0
3377 || strcmp (name, "doubleprecision") == 0
3378 || strcmp (name, "doublecomplex") == 0)
3385 /* Return TRUE if the symbol is an automatic variable. */
3388 gfc_is_var_automatic (gfc_symbol *sym)
3390 /* Pointer and allocatable variables are never automatic. */
3391 if (sym->attr.pointer || sym->attr.allocatable)
3393 /* Check for arrays with non-constant size. */
3394 if (sym->attr.dimension && sym->as
3395 && !gfc_is_compile_time_shape (sym->as))
3397 /* Check for non-constant length character variables. */
3398 if (sym->ts.type == BT_CHARACTER
3400 && !gfc_is_constant_expr (sym->ts.u.cl->length))
3405 /* Given a symbol, mark it as SAVEd if it is allowed. */
3408 save_symbol (gfc_symbol *sym)
3411 if (sym->attr.use_assoc)
3414 if (sym->attr.in_common
3417 || sym->attr.flavor != FL_VARIABLE)
3419 /* Automatic objects are not saved. */
3420 if (gfc_is_var_automatic (sym))
3422 gfc_add_save (&sym->attr, SAVE_EXPLICIT, sym->name, &sym->declared_at);
3426 /* Mark those symbols which can be SAVEd as such. */
3429 gfc_save_all (gfc_namespace *ns)
3431 gfc_traverse_ns (ns, save_symbol);
3435 /* Make sure that no changes to symbols are pending. */
3438 gfc_enforce_clean_symbol_state(void)
3440 gcc_assert (changed_syms == NULL);
3444 /************** Global symbol handling ************/
3447 /* Search a tree for the global symbol. */
3450 gfc_find_gsymbol (gfc_gsymbol *symbol, const char *name)
3459 c = strcmp (name, symbol->name);
3463 symbol = (c < 0) ? symbol->left : symbol->right;
3470 /* Compare two global symbols. Used for managing the BB tree. */
3473 gsym_compare (void *_s1, void *_s2)
3475 gfc_gsymbol *s1, *s2;
3477 s1 = (gfc_gsymbol *) _s1;
3478 s2 = (gfc_gsymbol *) _s2;
3479 return strcmp (s1->name, s2->name);
3483 /* Get a global symbol, creating it if it doesn't exist. */
3486 gfc_get_gsymbol (const char *name)
3490 s = gfc_find_gsymbol (gfc_gsym_root, name);
3494 s = XCNEW (gfc_gsymbol);
3495 s->type = GSYM_UNKNOWN;
3496 s->name = gfc_get_string (name);
3498 gfc_insert_bbt (&gfc_gsym_root, s, gsym_compare);
3505 get_iso_c_binding_dt (int sym_id)
3507 gfc_dt_list *dt_list;
3509 dt_list = gfc_derived_types;
3511 /* Loop through the derived types in the name list, searching for
3512 the desired symbol from iso_c_binding. Search the parent namespaces
3513 if necessary and requested to (parent_flag). */
3514 while (dt_list != NULL)
3516 if (dt_list->derived->from_intmod != INTMOD_NONE
3517 && dt_list->derived->intmod_sym_id == sym_id)
3518 return dt_list->derived;
3520 dt_list = dt_list->next;
3527 /* Verifies that the given derived type symbol, derived_sym, is interoperable
3528 with C. This is necessary for any derived type that is BIND(C) and for
3529 derived types that are parameters to functions that are BIND(C). All
3530 fields of the derived type are required to be interoperable, and are tested
3531 for such. If an error occurs, the errors are reported here, allowing for
3532 multiple errors to be handled for a single derived type. */
3535 verify_bind_c_derived_type (gfc_symbol *derived_sym)
3537 gfc_component *curr_comp = NULL;
3538 gfc_try is_c_interop = FAILURE;
3539 gfc_try retval = SUCCESS;
3541 if (derived_sym == NULL)
3542 gfc_internal_error ("verify_bind_c_derived_type(): Given symbol is "
3543 "unexpectedly NULL");
3545 /* If we've already looked at this derived symbol, do not look at it again
3546 so we don't repeat warnings/errors. */
3547 if (derived_sym->ts.is_c_interop)
3550 /* The derived type must have the BIND attribute to be interoperable
3551 J3/04-007, Section 15.2.3. */
3552 if (derived_sym->attr.is_bind_c != 1)
3554 derived_sym->ts.is_c_interop = 0;
3555 gfc_error_now ("Derived type '%s' declared at %L must have the BIND "
3556 "attribute to be C interoperable", derived_sym->name,
3557 &(derived_sym->declared_at));
3561 curr_comp = derived_sym->components;
3563 /* Fortran 2003 allows an empty derived type. C99 appears to disallow an
3564 empty struct. Section 15.2 in Fortran 2003 states: "The following
3565 subclauses define the conditions under which a Fortran entity is
3566 interoperable. If a Fortran entity is interoperable, an equivalent
3567 entity may be defined by means of C and the Fortran entity is said
3568 to be interoperable with the C entity. There does not have to be such
3569 an interoperating C entity."
3571 if (curr_comp == NULL)
3573 gfc_warning ("Derived type '%s' with BIND(C) attribute at %L is empty, "
3574 "and may be inaccessible by the C companion processor",
3575 derived_sym->name, &(derived_sym->declared_at));
3576 derived_sym->ts.is_c_interop = 1;
3577 derived_sym->attr.is_bind_c = 1;
3582 /* Initialize the derived type as being C interoperable.
3583 If we find an error in the components, this will be set false. */
3584 derived_sym->ts.is_c_interop = 1;
3586 /* Loop through the list of components to verify that the kind of
3587 each is a C interoperable type. */
3590 /* The components cannot be pointers (fortran sense).
3591 J3/04-007, Section 15.2.3, C1505. */
3592 if (curr_comp->attr.pointer != 0)
3594 gfc_error ("Component '%s' at %L cannot have the "
3595 "POINTER attribute because it is a member "
3596 "of the BIND(C) derived type '%s' at %L",
3597 curr_comp->name, &(curr_comp->loc),
3598 derived_sym->name, &(derived_sym->declared_at));
3602 if (curr_comp->attr.proc_pointer != 0)
3604 gfc_error ("Procedure pointer component '%s' at %L cannot be a member"
3605 " of the BIND(C) derived type '%s' at %L", curr_comp->name,
3606 &curr_comp->loc, derived_sym->name,
3607 &derived_sym->declared_at);
3611 /* The components cannot be allocatable.
3612 J3/04-007, Section 15.2.3, C1505. */
3613 if (curr_comp->attr.allocatable != 0)
3615 gfc_error ("Component '%s' at %L cannot have the "
3616 "ALLOCATABLE attribute because it is a member "
3617 "of the BIND(C) derived type '%s' at %L",
3618 curr_comp->name, &(curr_comp->loc),
3619 derived_sym->name, &(derived_sym->declared_at));
3623 /* BIND(C) derived types must have interoperable components. */
3624 if (curr_comp->ts.type == BT_DERIVED
3625 && curr_comp->ts.u.derived->ts.is_iso_c != 1
3626 && curr_comp->ts.u.derived != derived_sym)
3628 /* This should be allowed; the draft says a derived-type can not
3629 have type parameters if it is has the BIND attribute. Type
3630 parameters seem to be for making parameterized derived types.
3631 There's no need to verify the type if it is c_ptr/c_funptr. */
3632 retval = verify_bind_c_derived_type (curr_comp->ts.u.derived);
3636 /* Grab the typespec for the given component and test the kind. */
3637 is_c_interop = verify_c_interop (&(curr_comp->ts));
3639 if (is_c_interop != SUCCESS)
3641 /* Report warning and continue since not fatal. The
3642 draft does specify a constraint that requires all fields
3643 to interoperate, but if the user says real(4), etc., it
3644 may interoperate with *something* in C, but the compiler
3645 most likely won't know exactly what. Further, it may not
3646 interoperate with the same data type(s) in C if the user
3647 recompiles with different flags (e.g., -m32 and -m64 on
3648 x86_64 and using integer(4) to claim interop with a
3650 if (derived_sym->attr.is_bind_c == 1)
3651 /* If the derived type is bind(c), all fields must be
3653 gfc_warning ("Component '%s' in derived type '%s' at %L "
3654 "may not be C interoperable, even though "
3655 "derived type '%s' is BIND(C)",
3656 curr_comp->name, derived_sym->name,
3657 &(curr_comp->loc), derived_sym->name);
3659 /* If derived type is param to bind(c) routine, or to one
3660 of the iso_c_binding procs, it must be interoperable, so
3661 all fields must interop too. */
3662 gfc_warning ("Component '%s' in derived type '%s' at %L "
3663 "may not be C interoperable",
3664 curr_comp->name, derived_sym->name,
3669 curr_comp = curr_comp->next;
3670 } while (curr_comp != NULL);
3673 /* Make sure we don't have conflicts with the attributes. */
3674 if (derived_sym->attr.access == ACCESS_PRIVATE)
3676 gfc_error ("Derived type '%s' at %L cannot be declared with both "
3677 "PRIVATE and BIND(C) attributes", derived_sym->name,
3678 &(derived_sym->declared_at));
3682 if (derived_sym->attr.sequence != 0)
3684 gfc_error ("Derived type '%s' at %L cannot have the SEQUENCE "
3685 "attribute because it is BIND(C)", derived_sym->name,
3686 &(derived_sym->declared_at));
3690 /* Mark the derived type as not being C interoperable if we found an
3691 error. If there were only warnings, proceed with the assumption
3692 it's interoperable. */
3693 if (retval == FAILURE)
3694 derived_sym->ts.is_c_interop = 0;
3700 /* Generate symbols for the named constants c_null_ptr and c_null_funptr. */
3703 gen_special_c_interop_ptr (int ptr_id, const char *ptr_name,
3704 const char *module_name)
3706 gfc_symtree *tmp_symtree;
3707 gfc_symbol *tmp_sym;
3710 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, ptr_name);
3712 if (tmp_symtree != NULL)
3713 tmp_sym = tmp_symtree->n.sym;
3717 gfc_internal_error ("gen_special_c_interop_ptr(): Unable to "
3718 "create symbol for %s", ptr_name);
3721 /* Set up the symbol's important fields. Save attr required so we can
3722 initialize the ptr to NULL. */
3723 tmp_sym->attr.save = SAVE_EXPLICIT;
3724 tmp_sym->ts.is_c_interop = 1;
3725 tmp_sym->attr.is_c_interop = 1;
3726 tmp_sym->ts.is_iso_c = 1;
3727 tmp_sym->ts.type = BT_DERIVED;
3729 /* The c_ptr and c_funptr derived types will provide the
3730 definition for c_null_ptr and c_null_funptr, respectively. */
3731 if (ptr_id == ISOCBINDING_NULL_PTR)
3732 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_PTR);
3734 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3735 if (tmp_sym->ts.u.derived == NULL)
3737 /* This can occur if the user forgot to declare c_ptr or
3738 c_funptr and they're trying to use one of the procedures
3739 that has arg(s) of the missing type. In this case, a
3740 regular version of the thing should have been put in the
3742 generate_isocbinding_symbol (module_name, ptr_id == ISOCBINDING_NULL_PTR
3743 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR,
3744 (const char *) (ptr_id == ISOCBINDING_NULL_PTR
3745 ? "_gfortran_iso_c_binding_c_ptr"
3746 : "_gfortran_iso_c_binding_c_funptr"));
3748 tmp_sym->ts.u.derived =
3749 get_iso_c_binding_dt (ptr_id == ISOCBINDING_NULL_PTR
3750 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR);
3753 /* Module name is some mangled version of iso_c_binding. */
3754 tmp_sym->module = gfc_get_string (module_name);
3756 /* Say it's from the iso_c_binding module. */
3757 tmp_sym->attr.is_iso_c = 1;
3759 tmp_sym->attr.use_assoc = 1;
3760 tmp_sym->attr.is_bind_c = 1;
3761 /* Set the binding_label. */
3762 sprintf (tmp_sym->binding_label, "%s_%s", module_name, tmp_sym->name);
3764 /* Set the c_address field of c_null_ptr and c_null_funptr to
3765 the value of NULL. */
3766 tmp_sym->value = gfc_get_expr ();
3767 tmp_sym->value->expr_type = EXPR_STRUCTURE;
3768 tmp_sym->value->ts.type = BT_DERIVED;
3769 tmp_sym->value->ts.u.derived = tmp_sym->ts.u.derived;
3770 gfc_constructor_append_expr (&tmp_sym->value->value.constructor, NULL, NULL);
3771 c = gfc_constructor_first (tmp_sym->value->value.constructor);
3772 c->expr = gfc_get_expr ();
3773 c->expr->expr_type = EXPR_NULL;
3774 c->expr->ts.is_iso_c = 1;
3775 /* Must declare c_null_ptr and c_null_funptr as having the
3776 PARAMETER attribute so they can be used in init expressions. */
3777 tmp_sym->attr.flavor = FL_PARAMETER;
3783 /* Add a formal argument, gfc_formal_arglist, to the
3784 end of the given list of arguments. Set the reference to the
3785 provided symbol, param_sym, in the argument. */
3788 add_formal_arg (gfc_formal_arglist **head,
3789 gfc_formal_arglist **tail,
3790 gfc_formal_arglist *formal_arg,
3791 gfc_symbol *param_sym)
3793 /* Put in list, either as first arg or at the tail (curr arg). */
3795 *head = *tail = formal_arg;
3798 (*tail)->next = formal_arg;
3799 (*tail) = formal_arg;
3802 (*tail)->sym = param_sym;
3803 (*tail)->next = NULL;
3809 /* Generates a symbol representing the CPTR argument to an
3810 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3811 CPTR and add it to the provided argument list. */
3814 gen_cptr_param (gfc_formal_arglist **head,
3815 gfc_formal_arglist **tail,
3816 const char *module_name,
3817 gfc_namespace *ns, const char *c_ptr_name,
3820 gfc_symbol *param_sym = NULL;
3821 gfc_symbol *c_ptr_sym = NULL;
3822 gfc_symtree *param_symtree = NULL;
3823 gfc_formal_arglist *formal_arg = NULL;
3824 const char *c_ptr_in;
3825 const char *c_ptr_type = NULL;
3827 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3828 c_ptr_type = "_gfortran_iso_c_binding_c_funptr";
3830 c_ptr_type = "_gfortran_iso_c_binding_c_ptr";
3832 if(c_ptr_name == NULL)
3833 c_ptr_in = "gfc_cptr__";
3835 c_ptr_in = c_ptr_name;
3836 gfc_get_sym_tree (c_ptr_in, ns, ¶m_symtree, false);
3837 if (param_symtree != NULL)
3838 param_sym = param_symtree->n.sym;
3840 gfc_internal_error ("gen_cptr_param(): Unable to "
3841 "create symbol for %s", c_ptr_in);
3843 /* Set up the appropriate fields for the new c_ptr param sym. */
3845 param_sym->attr.flavor = FL_DERIVED;
3846 param_sym->ts.type = BT_DERIVED;
3847 param_sym->attr.intent = INTENT_IN;
3848 param_sym->attr.dummy = 1;
3850 /* This will pass the ptr to the iso_c routines as a (void *). */
3851 param_sym->attr.value = 1;
3852 param_sym->attr.use_assoc = 1;
3854 /* Get the symbol for c_ptr or c_funptr, no matter what it's name is
3856 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3857 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3859 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_PTR);
3860 if (c_ptr_sym == NULL)
3862 /* This can happen if the user did not define c_ptr but they are
3863 trying to use one of the iso_c_binding functions that need it. */
3864 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3865 generate_isocbinding_symbol (module_name, ISOCBINDING_FUNPTR,
3866 (const char *)c_ptr_type);
3868 generate_isocbinding_symbol (module_name, ISOCBINDING_PTR,
3869 (const char *)c_ptr_type);
3871 gfc_get_ha_symbol (c_ptr_type, &(c_ptr_sym));
3874 param_sym->ts.u.derived = c_ptr_sym;
3875 param_sym->module = gfc_get_string (module_name);
3877 /* Make new formal arg. */
3878 formal_arg = gfc_get_formal_arglist ();
3879 /* Add arg to list of formal args (the CPTR arg). */
3880 add_formal_arg (head, tail, formal_arg, param_sym);
3882 /* Validate changes. */
3883 gfc_commit_symbol (param_sym);
3887 /* Generates a symbol representing the FPTR argument to an
3888 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3889 FPTR and add it to the provided argument list. */
3892 gen_fptr_param (gfc_formal_arglist **head,
3893 gfc_formal_arglist **tail,
3894 const char *module_name,
3895 gfc_namespace *ns, const char *f_ptr_name, int proc)
3897 gfc_symbol *param_sym = NULL;
3898 gfc_symtree *param_symtree = NULL;
3899 gfc_formal_arglist *formal_arg = NULL;
3900 const char *f_ptr_out = "gfc_fptr__";
3902 if (f_ptr_name != NULL)
3903 f_ptr_out = f_ptr_name;
3905 gfc_get_sym_tree (f_ptr_out, ns, ¶m_symtree, false);
3906 if (param_symtree != NULL)
3907 param_sym = param_symtree->n.sym;
3909 gfc_internal_error ("generateFPtrParam(): Unable to "
3910 "create symbol for %s", f_ptr_out);
3912 /* Set up the necessary fields for the fptr output param sym. */
3915 param_sym->attr.proc_pointer = 1;
3917 param_sym->attr.pointer = 1;
3918 param_sym->attr.dummy = 1;
3919 param_sym->attr.use_assoc = 1;
3921 /* ISO C Binding type to allow any pointer type as actual param. */
3922 param_sym->ts.type = BT_VOID;
3923 param_sym->module = gfc_get_string (module_name);
3926 formal_arg = gfc_get_formal_arglist ();
3927 /* Add arg to list of formal args. */
3928 add_formal_arg (head, tail, formal_arg, param_sym);
3930 /* Validate changes. */
3931 gfc_commit_symbol (param_sym);
3935 /* Generates a symbol representing the optional SHAPE argument for the
3936 iso_c_binding c_f_pointer() procedure. Also, create a
3937 gfc_formal_arglist for the SHAPE and add it to the provided
3941 gen_shape_param (gfc_formal_arglist **head,
3942 gfc_formal_arglist **tail,
3943 const char *module_name,
3944 gfc_namespace *ns, const char *shape_param_name)
3946 gfc_symbol *param_sym = NULL;
3947 gfc_symtree *param_symtree = NULL;
3948 gfc_formal_arglist *formal_arg = NULL;
3949 const char *shape_param = "gfc_shape_array__";
3951 if (shape_param_name != NULL)
3952 shape_param = shape_param_name;
3954 gfc_get_sym_tree (shape_param, ns, ¶m_symtree, false);
3955 if (param_symtree != NULL)
3956 param_sym = param_symtree->n.sym;
3958 gfc_internal_error ("generateShapeParam(): Unable to "
3959 "create symbol for %s", shape_param);
3961 /* Set up the necessary fields for the shape input param sym. */
3963 param_sym->attr.dummy = 1;
3964 param_sym->attr.use_assoc = 1;
3966 /* Integer array, rank 1, describing the shape of the object. Make it's
3967 type BT_VOID initially so we can accept any type/kind combination of
3968 integer. During gfc_iso_c_sub_interface (resolve.c), we'll make it
3969 of BT_INTEGER type. */
3970 param_sym->ts.type = BT_VOID;
3972 /* Initialize the kind to default integer. However, it will be overridden
3973 during resolution to match the kind of the SHAPE parameter given as
3974 the actual argument (to allow for any valid integer kind). */
3975 param_sym->ts.kind = gfc_default_integer_kind;
3976 param_sym->as = gfc_get_array_spec ();
3978 param_sym->as->rank = 1;
3979 param_sym->as->lower[0] = gfc_get_int_expr (gfc_default_integer_kind,
3982 /* The extent is unknown until we get it. The length give us
3983 the rank the incoming pointer. */
3984 param_sym->as->type = AS_ASSUMED_SHAPE;
3986 /* The arg is also optional; it is required iff the second arg
3987 (fptr) is to an array, otherwise, it's ignored. */
3988 param_sym->attr.optional = 1;
3989 param_sym->attr.intent = INTENT_IN;
3990 param_sym->attr.dimension = 1;
3991 param_sym->module = gfc_get_string (module_name);
3994 formal_arg = gfc_get_formal_arglist ();
3995 /* Add arg to list of formal args. */
3996 add_formal_arg (head, tail, formal_arg, param_sym);
3998 /* Validate changes. */
3999 gfc_commit_symbol (param_sym);
4003 /* Add a procedure interface to the given symbol (i.e., store a
4004 reference to the list of formal arguments). */
4007 add_proc_interface (gfc_symbol *sym, ifsrc source,
4008 gfc_formal_arglist *formal)
4011 sym->formal = formal;
4012 sym->attr.if_source = source;
4016 /* Copy the formal args from an existing symbol, src, into a new
4017 symbol, dest. New formal args are created, and the description of
4018 each arg is set according to the existing ones. This function is
4019 used when creating procedure declaration variables from a procedure
4020 declaration statement (see match_proc_decl()) to create the formal
4021 args based on the args of a given named interface. */
4024 gfc_copy_formal_args (gfc_symbol *dest, gfc_symbol *src)
4026 gfc_formal_arglist *head = NULL;
4027 gfc_formal_arglist *tail = NULL;
4028 gfc_formal_arglist *formal_arg = NULL;
4029 gfc_formal_arglist *curr_arg = NULL;
4030 gfc_formal_arglist *formal_prev = NULL;
4031 /* Save current namespace so we can change it for formal args. */
4032 gfc_namespace *parent_ns = gfc_current_ns;
4034 /* Create a new namespace, which will be the formal ns (namespace
4035 of the formal args). */
4036 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4037 gfc_current_ns->proc_name = dest;
4039 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4041 formal_arg = gfc_get_formal_arglist ();
4042 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4044 /* May need to copy more info for the symbol. */
4045 formal_arg->sym->attr = curr_arg->sym->attr;
4046 formal_arg->sym->ts = curr_arg->sym->ts;
4047 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4048 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
4050 /* If this isn't the first arg, set up the next ptr. For the
4051 last arg built, the formal_arg->next will never get set to
4052 anything other than NULL. */
4053 if (formal_prev != NULL)
4054 formal_prev->next = formal_arg;
4056 formal_arg->next = NULL;
4058 formal_prev = formal_arg;
4060 /* Add arg to list of formal args. */
4061 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4063 /* Validate changes. */
4064 gfc_commit_symbol (formal_arg->sym);
4067 /* Add the interface to the symbol. */
4068 add_proc_interface (dest, IFSRC_DECL, head);
4070 /* Store the formal namespace information. */
4071 if (dest->formal != NULL)
4072 /* The current ns should be that for the dest proc. */
4073 dest->formal_ns = gfc_current_ns;
4074 /* Restore the current namespace to what it was on entry. */
4075 gfc_current_ns = parent_ns;
4080 gfc_copy_formal_args_intr (gfc_symbol *dest, gfc_intrinsic_sym *src)
4082 gfc_formal_arglist *head = NULL;
4083 gfc_formal_arglist *tail = NULL;
4084 gfc_formal_arglist *formal_arg = NULL;
4085 gfc_intrinsic_arg *curr_arg = NULL;
4086 gfc_formal_arglist *formal_prev = NULL;
4087 /* Save current namespace so we can change it for formal args. */
4088 gfc_namespace *parent_ns = gfc_current_ns;
4090 /* Create a new namespace, which will be the formal ns (namespace
4091 of the formal args). */
4092 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4093 gfc_current_ns->proc_name = dest;
4095 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4097 formal_arg = gfc_get_formal_arglist ();
4098 gfc_get_symbol (curr_arg->name, gfc_current_ns, &(formal_arg->sym));
4100 /* May need to copy more info for the symbol. */
4101 formal_arg->sym->ts = curr_arg->ts;
4102 formal_arg->sym->attr.optional = curr_arg->optional;
4103 formal_arg->sym->attr.value = curr_arg->value;
4104 formal_arg->sym->attr.intent = curr_arg->intent;
4105 formal_arg->sym->attr.flavor = FL_VARIABLE;
4106 formal_arg->sym->attr.dummy = 1;
4108 if (formal_arg->sym->ts.type == BT_CHARACTER)
4109 formal_arg->sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4111 /* If this isn't the first arg, set up the next ptr. For the
4112 last arg built, the formal_arg->next will never get set to
4113 anything other than NULL. */
4114 if (formal_prev != NULL)
4115 formal_prev->next = formal_arg;
4117 formal_arg->next = NULL;
4119 formal_prev = formal_arg;
4121 /* Add arg to list of formal args. */
4122 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4124 /* Validate changes. */
4125 gfc_commit_symbol (formal_arg->sym);
4128 /* Add the interface to the symbol. */
4129 add_proc_interface (dest, IFSRC_DECL, head);
4131 /* Store the formal namespace information. */
4132 if (dest->formal != NULL)
4133 /* The current ns should be that for the dest proc. */
4134 dest->formal_ns = gfc_current_ns;
4135 /* Restore the current namespace to what it was on entry. */
4136 gfc_current_ns = parent_ns;
4141 gfc_copy_formal_args_ppc (gfc_component *dest, gfc_symbol *src)
4143 gfc_formal_arglist *head = NULL;
4144 gfc_formal_arglist *tail = NULL;
4145 gfc_formal_arglist *formal_arg = NULL;
4146 gfc_formal_arglist *curr_arg = NULL;
4147 gfc_formal_arglist *formal_prev = NULL;
4148 /* Save current namespace so we can change it for formal args. */
4149 gfc_namespace *parent_ns = gfc_current_ns;
4151 /* Create a new namespace, which will be the formal ns (namespace
4152 of the formal args). */
4153 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4154 /* TODO: gfc_current_ns->proc_name = dest;*/
4156 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4158 formal_arg = gfc_get_formal_arglist ();
4159 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4161 /* May need to copy more info for the symbol. */
4162 formal_arg->sym->attr = curr_arg->sym->attr;
4163 formal_arg->sym->ts = curr_arg->sym->ts;
4164 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4165 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
4167 /* If this isn't the first arg, set up the next ptr. For the
4168 last arg built, the formal_arg->next will never get set to
4169 anything other than NULL. */
4170 if (formal_prev != NULL)
4171 formal_prev->next = formal_arg;
4173 formal_arg->next = NULL;
4175 formal_prev = formal_arg;
4177 /* Add arg to list of formal args. */
4178 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4180 /* Validate changes. */
4181 gfc_commit_symbol (formal_arg->sym);
4184 /* Add the interface to the symbol. */
4185 gfc_free_formal_arglist (dest->formal);
4186 dest->formal = head;
4187 dest->attr.if_source = IFSRC_DECL;
4189 /* Store the formal namespace information. */
4190 if (dest->formal != NULL)
4191 /* The current ns should be that for the dest proc. */
4192 dest->formal_ns = gfc_current_ns;
4193 /* Restore the current namespace to what it was on entry. */
4194 gfc_current_ns = parent_ns;
4198 /* Builds the parameter list for the iso_c_binding procedure
4199 c_f_pointer or c_f_procpointer. The old_sym typically refers to a
4200 generic version of either the c_f_pointer or c_f_procpointer
4201 functions. The new_proc_sym represents a "resolved" version of the
4202 symbol. The functions are resolved to match the types of their
4203 parameters; for example, c_f_pointer(cptr, fptr) would resolve to
4204 something similar to c_f_pointer_i4 if the type of data object fptr
4205 pointed to was a default integer. The actual name of the resolved
4206 procedure symbol is further mangled with the module name, etc., but
4207 the idea holds true. */
4210 build_formal_args (gfc_symbol *new_proc_sym,
4211 gfc_symbol *old_sym, int add_optional_arg)
4213 gfc_formal_arglist *head = NULL, *tail = NULL;
4214 gfc_namespace *parent_ns = NULL;
4216 parent_ns = gfc_current_ns;
4217 /* Create a new namespace, which will be the formal ns (namespace
4218 of the formal args). */
4219 gfc_current_ns = gfc_get_namespace(parent_ns, 0);
4220 gfc_current_ns->proc_name = new_proc_sym;
4222 /* Generate the params. */
4223 if (old_sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER)
4225 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4226 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4227 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4228 gfc_current_ns, "fptr", 1);
4230 else if (old_sym->intmod_sym_id == ISOCBINDING_F_POINTER)
4232 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4233 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4234 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4235 gfc_current_ns, "fptr", 0);
4236 /* If we're dealing with c_f_pointer, it has an optional third arg. */
4237 gen_shape_param (&head, &tail,(const char *) new_proc_sym->module,
4238 gfc_current_ns, "shape");
4241 else if (old_sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
4243 /* c_associated has one required arg and one optional; both
4245 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4246 gfc_current_ns, "c_ptr_1", ISOCBINDING_ASSOCIATED);
4247 if (add_optional_arg)
4249 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4250 gfc_current_ns, "c_ptr_2", ISOCBINDING_ASSOCIATED);
4251 /* The last param is optional so mark it as such. */
4252 tail->sym->attr.optional = 1;
4256 /* Add the interface (store formal args to new_proc_sym). */
4257 add_proc_interface (new_proc_sym, IFSRC_DECL, head);
4259 /* Set up the formal_ns pointer to the one created for the
4260 new procedure so it'll get cleaned up during gfc_free_symbol(). */
4261 new_proc_sym->formal_ns = gfc_current_ns;
4263 gfc_current_ns = parent_ns;
4267 std_for_isocbinding_symbol (int id)
4271 #define NAMED_INTCST(a,b,c,d) \
4274 #include "iso-c-binding.def"
4277 #define NAMED_FUNCTION(a,b,c,d) \
4280 #include "iso-c-binding.def"
4281 #undef NAMED_FUNCTION
4284 return GFC_STD_F2003;
4288 /* Generate the given set of C interoperable kind objects, or all
4289 interoperable kinds. This function will only be given kind objects
4290 for valid iso_c_binding defined types because this is verified when
4291 the 'use' statement is parsed. If the user gives an 'only' clause,
4292 the specific kinds are looked up; if they don't exist, an error is
4293 reported. If the user does not give an 'only' clause, all
4294 iso_c_binding symbols are generated. If a list of specific kinds
4295 is given, it must have a NULL in the first empty spot to mark the
4300 generate_isocbinding_symbol (const char *mod_name, iso_c_binding_symbol s,
4301 const char *local_name)
4303 const char *const name = (local_name && local_name[0]) ? local_name
4304 : c_interop_kinds_table[s].name;
4305 gfc_symtree *tmp_symtree = NULL;
4306 gfc_symbol *tmp_sym = NULL;
4307 gfc_dt_list **dt_list_ptr = NULL;
4308 gfc_component *tmp_comp = NULL;
4309 char comp_name[(GFC_MAX_SYMBOL_LEN * 2) + 1];
4312 if (gfc_notification_std (std_for_isocbinding_symbol (s)) == ERROR)
4314 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, name);
4316 /* Already exists in this scope so don't re-add it.
4317 TODO: we should probably check that it's really the same symbol. */
4318 if (tmp_symtree != NULL)
4321 /* Create the sym tree in the current ns. */
4322 gfc_get_sym_tree (name, gfc_current_ns, &tmp_symtree, false);
4324 tmp_sym = tmp_symtree->n.sym;
4326 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4329 /* Say what module this symbol belongs to. */
4330 tmp_sym->module = gfc_get_string (mod_name);
4331 tmp_sym->from_intmod = INTMOD_ISO_C_BINDING;
4332 tmp_sym->intmod_sym_id = s;
4337 #define NAMED_INTCST(a,b,c,d) case a :
4338 #define NAMED_REALCST(a,b,c) case a :
4339 #define NAMED_CMPXCST(a,b,c) case a :
4340 #define NAMED_LOGCST(a,b,c) case a :
4341 #define NAMED_CHARKNDCST(a,b,c) case a :
4342 #include "iso-c-binding.def"
4344 tmp_sym->value = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4345 c_interop_kinds_table[s].value);
4347 /* Initialize an integer constant expression node. */
4348 tmp_sym->attr.flavor = FL_PARAMETER;
4349 tmp_sym->ts.type = BT_INTEGER;
4350 tmp_sym->ts.kind = gfc_default_integer_kind;
4352 /* Mark this type as a C interoperable one. */
4353 tmp_sym->ts.is_c_interop = 1;
4354 tmp_sym->ts.is_iso_c = 1;
4355 tmp_sym->value->ts.is_c_interop = 1;
4356 tmp_sym->value->ts.is_iso_c = 1;
4357 tmp_sym->attr.is_c_interop = 1;
4359 /* Tell what f90 type this c interop kind is valid. */
4360 tmp_sym->ts.f90_type = c_interop_kinds_table[s].f90_type;
4362 /* Say it's from the iso_c_binding module. */
4363 tmp_sym->attr.is_iso_c = 1;
4365 /* Make it use associated. */
4366 tmp_sym->attr.use_assoc = 1;
4370 #define NAMED_CHARCST(a,b,c) case a :
4371 #include "iso-c-binding.def"
4373 /* Initialize an integer constant expression node for the
4374 length of the character. */
4375 tmp_sym->value = gfc_get_character_expr (gfc_default_character_kind,
4376 &gfc_current_locus, NULL, 1);
4377 tmp_sym->value->ts.is_c_interop = 1;
4378 tmp_sym->value->ts.is_iso_c = 1;
4379 tmp_sym->value->value.character.length = 1;
4380 tmp_sym->value->value.character.string[0]
4381 = (gfc_char_t) c_interop_kinds_table[s].value;
4382 tmp_sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4383 tmp_sym->ts.u.cl->length = gfc_get_int_expr (gfc_default_integer_kind,
4386 /* May not need this in both attr and ts, but do need in
4387 attr for writing module file. */
4388 tmp_sym->attr.is_c_interop = 1;
4390 tmp_sym->attr.flavor = FL_PARAMETER;
4391 tmp_sym->ts.type = BT_CHARACTER;
4393 /* Need to set it to the C_CHAR kind. */
4394 tmp_sym->ts.kind = gfc_default_character_kind;
4396 /* Mark this type as a C interoperable one. */
4397 tmp_sym->ts.is_c_interop = 1;
4398 tmp_sym->ts.is_iso_c = 1;
4400 /* Tell what f90 type this c interop kind is valid. */
4401 tmp_sym->ts.f90_type = BT_CHARACTER;
4403 /* Say it's from the iso_c_binding module. */
4404 tmp_sym->attr.is_iso_c = 1;
4406 /* Make it use associated. */
4407 tmp_sym->attr.use_assoc = 1;
4410 case ISOCBINDING_PTR:
4411 case ISOCBINDING_FUNPTR:
4413 /* Initialize an integer constant expression node. */
4414 tmp_sym->attr.flavor = FL_DERIVED;
4415 tmp_sym->ts.is_c_interop = 1;
4416 tmp_sym->attr.is_c_interop = 1;
4417 tmp_sym->attr.is_iso_c = 1;
4418 tmp_sym->ts.is_iso_c = 1;
4419 tmp_sym->ts.type = BT_DERIVED;
4421 /* A derived type must have the bind attribute to be
4422 interoperable (J3/04-007, Section 15.2.3), even though
4423 the binding label is not used. */
4424 tmp_sym->attr.is_bind_c = 1;
4426 tmp_sym->attr.referenced = 1;
4428 tmp_sym->ts.u.derived = tmp_sym;
4430 /* Add the symbol created for the derived type to the current ns. */
4431 dt_list_ptr = &(gfc_derived_types);
4432 while (*dt_list_ptr != NULL && (*dt_list_ptr)->next != NULL)
4433 dt_list_ptr = &((*dt_list_ptr)->next);
4435 /* There is already at least one derived type in the list, so append
4436 the one we're currently building for c_ptr or c_funptr. */
4437 if (*dt_list_ptr != NULL)
4438 dt_list_ptr = &((*dt_list_ptr)->next);
4439 (*dt_list_ptr) = gfc_get_dt_list ();
4440 (*dt_list_ptr)->derived = tmp_sym;
4441 (*dt_list_ptr)->next = NULL;
4443 /* Set up the component of the derived type, which will be
4444 an integer with kind equal to c_ptr_size. Mangle the name of
4445 the field for the c_address to prevent the curious user from
4446 trying to access it from Fortran. */
4447 sprintf (comp_name, "__%s_%s", tmp_sym->name, "c_address");
4448 gfc_add_component (tmp_sym, comp_name, &tmp_comp);
4449 if (tmp_comp == NULL)
4450 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4451 "create component for c_address");
4453 tmp_comp->ts.type = BT_INTEGER;
4455 /* Set this because the module will need to read/write this field. */
4456 tmp_comp->ts.f90_type = BT_INTEGER;
4458 /* The kinds for c_ptr and c_funptr are the same. */
4459 index = get_c_kind ("c_ptr", c_interop_kinds_table);
4460 tmp_comp->ts.kind = c_interop_kinds_table[index].value;
4462 tmp_comp->attr.pointer = 0;
4463 tmp_comp->attr.dimension = 0;
4465 /* Mark the component as C interoperable. */
4466 tmp_comp->ts.is_c_interop = 1;
4468 /* Make it use associated (iso_c_binding module). */
4469 tmp_sym->attr.use_assoc = 1;
4472 case ISOCBINDING_NULL_PTR:
4473 case ISOCBINDING_NULL_FUNPTR:
4474 gen_special_c_interop_ptr (s, name, mod_name);
4477 case ISOCBINDING_F_POINTER:
4478 case ISOCBINDING_ASSOCIATED:
4479 case ISOCBINDING_LOC:
4480 case ISOCBINDING_FUNLOC:
4481 case ISOCBINDING_F_PROCPOINTER:
4483 tmp_sym->attr.proc = PROC_MODULE;
4485 /* Use the procedure's name as it is in the iso_c_binding module for
4486 setting the binding label in case the user renamed the symbol. */
4487 sprintf (tmp_sym->binding_label, "%s_%s", mod_name,
4488 c_interop_kinds_table[s].name);
4489 tmp_sym->attr.is_iso_c = 1;
4490 if (s == ISOCBINDING_F_POINTER || s == ISOCBINDING_F_PROCPOINTER)
4491 tmp_sym->attr.subroutine = 1;
4494 /* TODO! This needs to be finished more for the expr of the
4495 function or something!
4496 This may not need to be here, because trying to do c_loc
4498 if (s == ISOCBINDING_ASSOCIATED)
4500 tmp_sym->attr.function = 1;
4501 tmp_sym->ts.type = BT_LOGICAL;
4502 tmp_sym->ts.kind = gfc_default_logical_kind;
4503 tmp_sym->result = tmp_sym;
4507 /* Here, we're taking the simple approach. We're defining
4508 c_loc as an external identifier so the compiler will put
4509 what we expect on the stack for the address we want the
4511 tmp_sym->ts.type = BT_DERIVED;
4512 if (s == ISOCBINDING_LOC)
4513 tmp_sym->ts.u.derived =
4514 get_iso_c_binding_dt (ISOCBINDING_PTR);
4516 tmp_sym->ts.u.derived =
4517 get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
4519 if (tmp_sym->ts.u.derived == NULL)
4521 /* Create the necessary derived type so we can continue
4522 processing the file. */
4523 generate_isocbinding_symbol
4524 (mod_name, s == ISOCBINDING_FUNLOC
4525 ? ISOCBINDING_FUNPTR : ISOCBINDING_PTR,
4526 (const char *)(s == ISOCBINDING_FUNLOC
4527 ? "_gfortran_iso_c_binding_c_funptr"
4528 : "_gfortran_iso_c_binding_c_ptr"));
4529 tmp_sym->ts.u.derived =
4530 get_iso_c_binding_dt (s == ISOCBINDING_FUNLOC
4531 ? ISOCBINDING_FUNPTR
4535 /* The function result is itself (no result clause). */
4536 tmp_sym->result = tmp_sym;
4537 tmp_sym->attr.external = 1;
4538 tmp_sym->attr.use_assoc = 0;
4539 tmp_sym->attr.pure = 1;
4540 tmp_sym->attr.if_source = IFSRC_UNKNOWN;
4541 tmp_sym->attr.proc = PROC_UNKNOWN;
4545 tmp_sym->attr.flavor = FL_PROCEDURE;
4546 tmp_sym->attr.contained = 0;
4548 /* Try using this builder routine, with the new and old symbols
4549 both being the generic iso_c proc sym being created. This
4550 will create the formal args (and the new namespace for them).
4551 Don't build an arg list for c_loc because we're going to treat
4552 c_loc as an external procedure. */
4553 if (s != ISOCBINDING_LOC && s != ISOCBINDING_FUNLOC)
4554 /* The 1 says to add any optional args, if applicable. */
4555 build_formal_args (tmp_sym, tmp_sym, 1);
4557 /* Set this after setting up the symbol, to prevent error messages. */
4558 tmp_sym->attr.use_assoc = 1;
4560 /* This symbol will not be referenced directly. It will be
4561 resolved to the implementation for the given f90 kind. */
4562 tmp_sym->attr.referenced = 0;
4569 gfc_commit_symbol (tmp_sym);
4573 /* Creates a new symbol based off of an old iso_c symbol, with a new
4574 binding label. This function can be used to create a new,
4575 resolved, version of a procedure symbol for c_f_pointer or
4576 c_f_procpointer that is based on the generic symbols. A new
4577 parameter list is created for the new symbol using
4578 build_formal_args(). The add_optional_flag specifies whether the
4579 to add the optional SHAPE argument. The new symbol is
4583 get_iso_c_sym (gfc_symbol *old_sym, char *new_name,
4584 char *new_binding_label, int add_optional_arg)
4586 gfc_symtree *new_symtree = NULL;
4588 /* See if we have a symbol by that name already available, looking
4589 through any parent namespaces. */
4590 gfc_find_sym_tree (new_name, gfc_current_ns, 1, &new_symtree);
4591 if (new_symtree != NULL)
4592 /* Return the existing symbol. */
4593 return new_symtree->n.sym;
4595 /* Create the symtree/symbol, with attempted host association. */
4596 gfc_get_ha_sym_tree (new_name, &new_symtree);
4597 if (new_symtree == NULL)
4598 gfc_internal_error ("get_iso_c_sym(): Unable to create "
4599 "symtree for '%s'", new_name);
4601 /* Now fill in the fields of the resolved symbol with the old sym. */
4602 strcpy (new_symtree->n.sym->binding_label, new_binding_label);
4603 new_symtree->n.sym->attr = old_sym->attr;
4604 new_symtree->n.sym->ts = old_sym->ts;
4605 new_symtree->n.sym->module = gfc_get_string (old_sym->module);
4606 new_symtree->n.sym->from_intmod = old_sym->from_intmod;
4607 new_symtree->n.sym->intmod_sym_id = old_sym->intmod_sym_id;
4608 if (old_sym->attr.function)
4609 new_symtree->n.sym->result = new_symtree->n.sym;
4610 /* Build the formal arg list. */
4611 build_formal_args (new_symtree->n.sym, old_sym, add_optional_arg);
4613 gfc_commit_symbol (new_symtree->n.sym);
4615 return new_symtree->n.sym;
4619 /* Check that a symbol is already typed. If strict is not set, an untyped
4620 symbol is acceptable for non-standard-conforming mode. */
4623 gfc_check_symbol_typed (gfc_symbol* sym, gfc_namespace* ns,
4624 bool strict, locus where)
4628 if (gfc_matching_prefix)
4631 /* Check for the type and try to give it an implicit one. */
4632 if (sym->ts.type == BT_UNKNOWN
4633 && gfc_set_default_type (sym, 0, ns) == FAILURE)
4637 gfc_error ("Symbol '%s' is used before it is typed at %L",
4642 if (gfc_notify_std (GFC_STD_GNU,
4643 "Extension: Symbol '%s' is used before"
4644 " it is typed at %L", sym->name, &where) == FAILURE)
4648 /* Everything is ok. */
4653 /* Construct a typebound-procedure structure. Those are stored in a tentative
4654 list and marked `error' until symbols are committed. */
4657 gfc_get_typebound_proc (gfc_typebound_proc *tb0)
4659 gfc_typebound_proc *result;
4660 tentative_tbp *list_node;
4662 result = XCNEW (gfc_typebound_proc);
4667 list_node = XCNEW (tentative_tbp);
4668 list_node->next = tentative_tbp_list;
4669 list_node->proc = result;
4670 tentative_tbp_list = list_node;
4676 /* Get the super-type of a given derived type. */
4679 gfc_get_derived_super_type (gfc_symbol* derived)
4681 if (!derived->attr.extension)
4684 gcc_assert (derived->components);
4685 gcc_assert (derived->components->ts.type == BT_DERIVED);
4686 gcc_assert (derived->components->ts.u.derived);
4688 return derived->components->ts.u.derived;
4692 /* Get the ultimate super-type of a given derived type. */
4695 gfc_get_ultimate_derived_super_type (gfc_symbol* derived)
4697 if (!derived->attr.extension)
4700 derived = gfc_get_derived_super_type (derived);
4702 if (derived->attr.extension)
4703 return gfc_get_ultimate_derived_super_type (derived);
4709 /* Check if a derived type t2 is an extension of (or equal to) a type t1. */
4712 gfc_type_is_extension_of (gfc_symbol *t1, gfc_symbol *t2)
4714 while (!gfc_compare_derived_types (t1, t2) && t2->attr.extension)
4715 t2 = gfc_get_derived_super_type (t2);
4716 return gfc_compare_derived_types (t1, t2);
4720 /* Check if two typespecs are type compatible (F03:5.1.1.2):
4721 If ts1 is nonpolymorphic, ts2 must be the same type.
4722 If ts1 is polymorphic (CLASS), ts2 must be an extension of ts1. */
4725 gfc_type_compatible (gfc_typespec *ts1, gfc_typespec *ts2)
4727 bool is_class1 = (ts1->type == BT_CLASS);
4728 bool is_class2 = (ts2->type == BT_CLASS);
4729 bool is_derived1 = (ts1->type == BT_DERIVED);
4730 bool is_derived2 = (ts2->type == BT_DERIVED);
4732 if (!is_derived1 && !is_derived2 && !is_class1 && !is_class2)
4733 return (ts1->type == ts2->type);
4735 if (is_derived1 && is_derived2)
4736 return gfc_compare_derived_types (ts1->u.derived, ts2->u.derived);
4738 if (is_class1 && is_derived2)
4739 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4741 else if (is_class1 && is_class2)
4742 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4743 ts2->u.derived->components->ts.u.derived);
4749 /* Find the parent-namespace of the current function. If we're inside
4750 BLOCK constructs, it may not be the current one. */
4753 gfc_find_proc_namespace (gfc_namespace* ns)
4755 while (ns->construct_entities)
4765 /* Check if an associate-variable should be translated as an `implicit' pointer
4766 internally (if it is associated to a variable and not an array with
4770 gfc_is_associate_pointer (gfc_symbol* sym)
4775 if (!sym->assoc->variable)
4778 if (sym->attr.dimension && sym->as->type != AS_EXPLICIT)