1 /* Maintain binary trees of symbols.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
26 #include "coretypes.h"
31 #include "constructor.h"
34 /* Strings for all symbol attributes. We use these for dumping the
35 parse tree, in error messages, and also when reading and writing
38 const mstring flavors[] =
40 minit ("UNKNOWN-FL", FL_UNKNOWN), minit ("PROGRAM", FL_PROGRAM),
41 minit ("BLOCK-DATA", FL_BLOCK_DATA), minit ("MODULE", FL_MODULE),
42 minit ("VARIABLE", FL_VARIABLE), minit ("PARAMETER", FL_PARAMETER),
43 minit ("LABEL", FL_LABEL), minit ("PROCEDURE", FL_PROCEDURE),
44 minit ("DERIVED", FL_DERIVED), minit ("NAMELIST", FL_NAMELIST),
48 const mstring procedures[] =
50 minit ("UNKNOWN-PROC", PROC_UNKNOWN),
51 minit ("MODULE-PROC", PROC_MODULE),
52 minit ("INTERNAL-PROC", PROC_INTERNAL),
53 minit ("DUMMY-PROC", PROC_DUMMY),
54 minit ("INTRINSIC-PROC", PROC_INTRINSIC),
55 minit ("EXTERNAL-PROC", PROC_EXTERNAL),
56 minit ("STATEMENT-PROC", PROC_ST_FUNCTION),
60 const mstring intents[] =
62 minit ("UNKNOWN-INTENT", INTENT_UNKNOWN),
63 minit ("IN", INTENT_IN),
64 minit ("OUT", INTENT_OUT),
65 minit ("INOUT", INTENT_INOUT),
69 const mstring access_types[] =
71 minit ("UNKNOWN-ACCESS", ACCESS_UNKNOWN),
72 minit ("PUBLIC", ACCESS_PUBLIC),
73 minit ("PRIVATE", ACCESS_PRIVATE),
77 const mstring ifsrc_types[] =
79 minit ("UNKNOWN", IFSRC_UNKNOWN),
80 minit ("DECL", IFSRC_DECL),
81 minit ("BODY", IFSRC_IFBODY)
84 const mstring save_status[] =
86 minit ("UNKNOWN", SAVE_NONE),
87 minit ("EXPLICIT-SAVE", SAVE_EXPLICIT),
88 minit ("IMPLICIT-SAVE", SAVE_IMPLICIT),
91 /* This is to make sure the backend generates setup code in the correct
94 static int next_dummy_order = 1;
97 gfc_namespace *gfc_current_ns;
98 gfc_namespace *gfc_global_ns_list;
100 gfc_gsymbol *gfc_gsym_root = NULL;
102 static gfc_symbol *changed_syms = NULL;
104 gfc_dt_list *gfc_derived_types;
107 /* List of tentative typebound-procedures. */
109 typedef struct tentative_tbp
111 gfc_typebound_proc *proc;
112 struct tentative_tbp *next;
116 static tentative_tbp *tentative_tbp_list = NULL;
119 /*********** IMPLICIT NONE and IMPLICIT statement handlers ***********/
121 /* The following static variable indicates whether a particular element has
122 been explicitly set or not. */
124 static int new_flag[GFC_LETTERS];
127 /* Handle a correctly parsed IMPLICIT NONE. */
130 gfc_set_implicit_none (void)
134 if (gfc_current_ns->seen_implicit_none)
136 gfc_error ("Duplicate IMPLICIT NONE statement at %C");
140 gfc_current_ns->seen_implicit_none = 1;
142 for (i = 0; i < GFC_LETTERS; i++)
144 gfc_clear_ts (&gfc_current_ns->default_type[i]);
145 gfc_current_ns->set_flag[i] = 1;
150 /* Reset the implicit range flags. */
153 gfc_clear_new_implicit (void)
157 for (i = 0; i < GFC_LETTERS; i++)
162 /* Prepare for a new implicit range. Sets flags in new_flag[]. */
165 gfc_add_new_implicit_range (int c1, int c2)
172 for (i = c1; i <= c2; i++)
176 gfc_error ("Letter '%c' already set in IMPLICIT statement at %C",
188 /* Add a matched implicit range for gfc_set_implicit(). Check if merging
189 the new implicit types back into the existing types will work. */
192 gfc_merge_new_implicit (gfc_typespec *ts)
196 if (gfc_current_ns->seen_implicit_none)
198 gfc_error ("Cannot specify IMPLICIT at %C after IMPLICIT NONE");
202 for (i = 0; i < GFC_LETTERS; i++)
206 if (gfc_current_ns->set_flag[i])
208 gfc_error ("Letter %c already has an IMPLICIT type at %C",
213 gfc_current_ns->default_type[i] = *ts;
214 gfc_current_ns->implicit_loc[i] = gfc_current_locus;
215 gfc_current_ns->set_flag[i] = 1;
222 /* Given a symbol, return a pointer to the typespec for its default type. */
225 gfc_get_default_type (const char *name, gfc_namespace *ns)
231 if (gfc_option.flag_allow_leading_underscore && letter == '_')
232 gfc_internal_error ("Option -fallow-leading-underscore is for use only by "
233 "gfortran developers, and should not be used for "
234 "implicitly typed variables");
236 if (letter < 'a' || letter > 'z')
237 gfc_internal_error ("gfc_get_default_type(): Bad symbol '%s'", name);
242 return &ns->default_type[letter - 'a'];
246 /* Given a pointer to a symbol, set its type according to the first
247 letter of its name. Fails if the letter in question has no default
251 gfc_set_default_type (gfc_symbol *sym, int error_flag, gfc_namespace *ns)
255 if (sym->ts.type != BT_UNKNOWN)
256 gfc_internal_error ("gfc_set_default_type(): symbol already has a type");
258 ts = gfc_get_default_type (sym->name, ns);
260 if (ts->type == BT_UNKNOWN)
262 if (error_flag && !sym->attr.untyped)
264 gfc_error ("Symbol '%s' at %L has no IMPLICIT type",
265 sym->name, &sym->declared_at);
266 sym->attr.untyped = 1; /* Ensure we only give an error once. */
273 sym->attr.implicit_type = 1;
275 if (ts->type == BT_CHARACTER && ts->u.cl)
276 sym->ts.u.cl = gfc_new_charlen (sym->ns, ts->u.cl);
278 if (sym->attr.is_bind_c == 1 && gfc_option.warn_c_binding_type)
280 /* BIND(C) variables should not be implicitly declared. */
281 gfc_warning_now ("Implicitly declared BIND(C) variable '%s' at %L may "
282 "not be C interoperable", sym->name, &sym->declared_at);
283 sym->ts.f90_type = sym->ts.type;
286 if (sym->attr.dummy != 0)
288 if (sym->ns->proc_name != NULL
289 && (sym->ns->proc_name->attr.subroutine != 0
290 || sym->ns->proc_name->attr.function != 0)
291 && sym->ns->proc_name->attr.is_bind_c != 0
292 && gfc_option.warn_c_binding_type)
294 /* Dummy args to a BIND(C) routine may not be interoperable if
295 they are implicitly typed. */
296 gfc_warning_now ("Implicitly declared variable '%s' at %L may not "
297 "be C interoperable but it is a dummy argument to "
298 "the BIND(C) procedure '%s' at %L", sym->name,
299 &(sym->declared_at), sym->ns->proc_name->name,
300 &(sym->ns->proc_name->declared_at));
301 sym->ts.f90_type = sym->ts.type;
309 /* This function is called from parse.c(parse_progunit) to check the
310 type of the function is not implicitly typed in the host namespace
311 and to implicitly type the function result, if necessary. */
314 gfc_check_function_type (gfc_namespace *ns)
316 gfc_symbol *proc = ns->proc_name;
318 if (!proc->attr.contained || proc->result->attr.implicit_type)
321 if (proc->result->ts.type == BT_UNKNOWN && proc->result->ts.interface == NULL)
323 if (gfc_set_default_type (proc->result, 0, gfc_current_ns)
326 if (proc->result != proc)
328 proc->ts = proc->result->ts;
329 proc->as = gfc_copy_array_spec (proc->result->as);
330 proc->attr.dimension = proc->result->attr.dimension;
331 proc->attr.pointer = proc->result->attr.pointer;
332 proc->attr.allocatable = proc->result->attr.allocatable;
335 else if (!proc->result->attr.proc_pointer)
337 gfc_error ("Function result '%s' at %L has no IMPLICIT type",
338 proc->result->name, &proc->result->declared_at);
339 proc->result->attr.untyped = 1;
345 /******************** Symbol attribute stuff *********************/
347 /* This is a generic conflict-checker. We do this to avoid having a
348 single conflict in two places. */
350 #define conf(a, b) if (attr->a && attr->b) { a1 = a; a2 = b; goto conflict; }
351 #define conf2(a) if (attr->a) { a2 = a; goto conflict; }
352 #define conf_std(a, b, std) if (attr->a && attr->b)\
361 check_conflict (symbol_attribute *attr, const char *name, locus *where)
363 static const char *dummy = "DUMMY", *save = "SAVE", *pointer = "POINTER",
364 *target = "TARGET", *external = "EXTERNAL", *intent = "INTENT",
365 *intent_in = "INTENT(IN)", *intrinsic = "INTRINSIC",
366 *intent_out = "INTENT(OUT)", *intent_inout = "INTENT(INOUT)",
367 *allocatable = "ALLOCATABLE", *elemental = "ELEMENTAL",
368 *privat = "PRIVATE", *recursive = "RECURSIVE",
369 *in_common = "COMMON", *result = "RESULT", *in_namelist = "NAMELIST",
370 *publik = "PUBLIC", *optional = "OPTIONAL", *entry = "ENTRY",
371 *function = "FUNCTION", *subroutine = "SUBROUTINE",
372 *dimension = "DIMENSION", *in_equivalence = "EQUIVALENCE",
373 *use_assoc = "USE ASSOCIATED", *cray_pointer = "CRAY POINTER",
374 *cray_pointee = "CRAY POINTEE", *data = "DATA", *value = "VALUE",
375 *volatile_ = "VOLATILE", *is_protected = "PROTECTED",
376 *is_bind_c = "BIND(C)", *procedure = "PROCEDURE",
377 *asynchronous = "ASYNCHRONOUS", *codimension = "CODIMENSION",
378 *contiguous = "CONTIGUOUS", *generic = "GENERIC";
379 static const char *threadprivate = "THREADPRIVATE";
385 where = &gfc_current_locus;
387 if (attr->pointer && attr->intent != INTENT_UNKNOWN)
391 standard = GFC_STD_F2003;
395 if (attr->in_namelist && (attr->allocatable || attr->pointer))
398 a2 = attr->allocatable ? allocatable : pointer;
399 standard = GFC_STD_F2003;
403 /* Check for attributes not allowed in a BLOCK DATA. */
404 if (gfc_current_state () == COMP_BLOCK_DATA)
408 if (attr->in_namelist)
410 if (attr->allocatable)
416 if (attr->access == ACCESS_PRIVATE)
418 if (attr->access == ACCESS_PUBLIC)
420 if (attr->intent != INTENT_UNKNOWN)
426 ("%s attribute not allowed in BLOCK DATA program unit at %L",
432 if (attr->save == SAVE_EXPLICIT)
435 conf (in_common, save);
438 switch (attr->flavor)
446 a1 = gfc_code2string (flavors, attr->flavor);
450 gfc_error ("Namelist group name at %L cannot have the "
451 "SAVE attribute", where);
455 /* Conflicts between SAVE and PROCEDURE will be checked at
456 resolution stage, see "resolve_fl_procedure". */
464 conf (dummy, intrinsic);
465 conf (dummy, threadprivate);
466 conf (pointer, target);
467 conf (pointer, intrinsic);
468 conf (pointer, elemental);
469 conf (allocatable, elemental);
471 conf (target, external);
472 conf (target, intrinsic);
474 if (!attr->if_source)
475 conf (external, dimension); /* See Fortran 95's R504. */
477 conf (external, intrinsic);
478 conf (entry, intrinsic);
480 if ((attr->if_source == IFSRC_DECL && !attr->procedure) || attr->contained)
481 conf (external, subroutine);
483 if (attr->proc_pointer && gfc_notify_std (GFC_STD_F2003,
484 "Fortran 2003: Procedure pointer at %C") == FAILURE)
487 conf (allocatable, pointer);
488 conf_std (allocatable, dummy, GFC_STD_F2003);
489 conf_std (allocatable, function, GFC_STD_F2003);
490 conf_std (allocatable, result, GFC_STD_F2003);
491 conf (elemental, recursive);
493 conf (in_common, dummy);
494 conf (in_common, allocatable);
495 conf (in_common, codimension);
496 conf (in_common, result);
498 conf (in_equivalence, use_assoc);
499 conf (in_equivalence, codimension);
500 conf (in_equivalence, dummy);
501 conf (in_equivalence, target);
502 conf (in_equivalence, pointer);
503 conf (in_equivalence, function);
504 conf (in_equivalence, result);
505 conf (in_equivalence, entry);
506 conf (in_equivalence, allocatable);
507 conf (in_equivalence, threadprivate);
509 conf (dummy, result);
510 conf (entry, result);
511 conf (generic, result);
513 conf (function, subroutine);
515 if (!function && !subroutine)
516 conf (is_bind_c, dummy);
518 conf (is_bind_c, cray_pointer);
519 conf (is_bind_c, cray_pointee);
520 conf (is_bind_c, codimension);
521 conf (is_bind_c, allocatable);
522 conf (is_bind_c, elemental);
524 /* Need to also get volatile attr, according to 5.1 of F2003 draft.
525 Parameter conflict caught below. Also, value cannot be specified
526 for a dummy procedure. */
528 /* Cray pointer/pointee conflicts. */
529 conf (cray_pointer, cray_pointee);
530 conf (cray_pointer, dimension);
531 conf (cray_pointer, codimension);
532 conf (cray_pointer, contiguous);
533 conf (cray_pointer, pointer);
534 conf (cray_pointer, target);
535 conf (cray_pointer, allocatable);
536 conf (cray_pointer, external);
537 conf (cray_pointer, intrinsic);
538 conf (cray_pointer, in_namelist);
539 conf (cray_pointer, function);
540 conf (cray_pointer, subroutine);
541 conf (cray_pointer, entry);
543 conf (cray_pointee, allocatable);
544 conf (cray_pointer, contiguous);
545 conf (cray_pointer, codimension);
546 conf (cray_pointee, intent);
547 conf (cray_pointee, optional);
548 conf (cray_pointee, dummy);
549 conf (cray_pointee, target);
550 conf (cray_pointee, intrinsic);
551 conf (cray_pointee, pointer);
552 conf (cray_pointee, entry);
553 conf (cray_pointee, in_common);
554 conf (cray_pointee, in_equivalence);
555 conf (cray_pointee, threadprivate);
558 conf (data, function);
560 conf (data, allocatable);
562 conf (value, pointer)
563 conf (value, allocatable)
564 conf (value, subroutine)
565 conf (value, function)
566 conf (value, volatile_)
567 conf (value, dimension)
568 conf (value, codimension)
569 conf (value, external)
571 conf (codimension, result)
574 && (attr->intent == INTENT_OUT || attr->intent == INTENT_INOUT))
577 a2 = attr->intent == INTENT_OUT ? intent_out : intent_inout;
581 conf (is_protected, intrinsic)
582 conf (is_protected, in_common)
584 conf (asynchronous, intrinsic)
585 conf (asynchronous, external)
587 conf (volatile_, intrinsic)
588 conf (volatile_, external)
590 if (attr->volatile_ && attr->intent == INTENT_IN)
597 conf (procedure, allocatable)
598 conf (procedure, dimension)
599 conf (procedure, codimension)
600 conf (procedure, intrinsic)
601 conf (procedure, target)
602 conf (procedure, value)
603 conf (procedure, volatile_)
604 conf (procedure, asynchronous)
605 conf (procedure, entry)
607 a1 = gfc_code2string (flavors, attr->flavor);
609 if (attr->in_namelist
610 && attr->flavor != FL_VARIABLE
611 && attr->flavor != FL_PROCEDURE
612 && attr->flavor != FL_UNKNOWN)
618 switch (attr->flavor)
628 conf2 (asynchronous);
631 conf2 (is_protected);
641 conf2 (threadprivate);
643 if (attr->access == ACCESS_PUBLIC || attr->access == ACCESS_PRIVATE)
645 a2 = attr->access == ACCESS_PUBLIC ? publik : privat;
646 gfc_error ("%s attribute applied to %s %s at %L", a2, a1,
653 gfc_error_now ("BIND(C) applied to %s %s at %L", a1, name, where);
667 /* Conflicts with INTENT, SAVE and RESULT will be checked
668 at resolution stage, see "resolve_fl_procedure". */
670 if (attr->subroutine)
676 conf2 (asynchronous);
681 if (!attr->proc_pointer)
682 conf2 (threadprivate);
685 if (!attr->proc_pointer)
690 case PROC_ST_FUNCTION:
701 conf2 (threadprivate);
721 conf2 (threadprivate);
724 if (attr->intent != INTENT_UNKNOWN)
741 conf2 (is_protected);
747 conf2 (asynchronous);
748 conf2 (threadprivate);
764 gfc_error ("%s attribute conflicts with %s attribute at %L",
767 gfc_error ("%s attribute conflicts with %s attribute in '%s' at %L",
768 a1, a2, name, where);
775 return gfc_notify_std (standard, "Fortran 2003: %s attribute "
776 "with %s attribute at %L", a1, a2,
781 return gfc_notify_std (standard, "Fortran 2003: %s attribute "
782 "with %s attribute in '%s' at %L",
783 a1, a2, name, where);
792 /* Mark a symbol as referenced. */
795 gfc_set_sym_referenced (gfc_symbol *sym)
798 if (sym->attr.referenced)
801 sym->attr.referenced = 1;
803 /* Remember which order dummy variables are accessed in. */
805 sym->dummy_order = next_dummy_order++;
809 /* Common subroutine called by attribute changing subroutines in order
810 to prevent them from changing a symbol that has been
811 use-associated. Returns zero if it is OK to change the symbol,
815 check_used (symbol_attribute *attr, const char *name, locus *where)
818 if (attr->use_assoc == 0)
822 where = &gfc_current_locus;
825 gfc_error ("Cannot change attributes of USE-associated symbol at %L",
828 gfc_error ("Cannot change attributes of USE-associated symbol %s at %L",
835 /* Generate an error because of a duplicate attribute. */
838 duplicate_attr (const char *attr, locus *where)
842 where = &gfc_current_locus;
844 gfc_error ("Duplicate %s attribute specified at %L", attr, where);
849 gfc_add_ext_attribute (symbol_attribute *attr, ext_attr_id_t ext_attr,
850 locus *where ATTRIBUTE_UNUSED)
852 attr->ext_attr |= 1 << ext_attr;
857 /* Called from decl.c (attr_decl1) to check attributes, when declared
861 gfc_add_attribute (symbol_attribute *attr, locus *where)
863 if (check_used (attr, NULL, where))
866 return check_conflict (attr, NULL, where);
871 gfc_add_allocatable (symbol_attribute *attr, locus *where)
874 if (check_used (attr, NULL, where))
877 if (attr->allocatable)
879 duplicate_attr ("ALLOCATABLE", where);
883 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
884 && gfc_find_state (COMP_INTERFACE) == FAILURE)
886 gfc_error ("ALLOCATABLE specified outside of INTERFACE body at %L",
891 attr->allocatable = 1;
892 return check_conflict (attr, NULL, where);
897 gfc_add_codimension (symbol_attribute *attr, const char *name, locus *where)
900 if (check_used (attr, name, where))
903 if (attr->codimension)
905 duplicate_attr ("CODIMENSION", where);
909 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
910 && gfc_find_state (COMP_INTERFACE) == FAILURE)
912 gfc_error ("CODIMENSION specified for '%s' outside its INTERFACE body "
913 "at %L", name, where);
917 attr->codimension = 1;
918 return check_conflict (attr, name, where);
923 gfc_add_dimension (symbol_attribute *attr, const char *name, locus *where)
926 if (check_used (attr, name, where))
931 duplicate_attr ("DIMENSION", where);
935 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
936 && gfc_find_state (COMP_INTERFACE) == FAILURE)
938 gfc_error ("DIMENSION specified for '%s' outside its INTERFACE body "
939 "at %L", name, where);
944 return check_conflict (attr, name, where);
949 gfc_add_contiguous (symbol_attribute *attr, const char *name, locus *where)
952 if (check_used (attr, name, where))
955 attr->contiguous = 1;
956 return check_conflict (attr, name, where);
961 gfc_add_external (symbol_attribute *attr, locus *where)
964 if (check_used (attr, NULL, where))
969 duplicate_attr ("EXTERNAL", where);
973 if (attr->pointer && attr->if_source != IFSRC_IFBODY)
976 attr->proc_pointer = 1;
981 return check_conflict (attr, NULL, where);
986 gfc_add_intrinsic (symbol_attribute *attr, locus *where)
989 if (check_used (attr, NULL, where))
994 duplicate_attr ("INTRINSIC", where);
1000 return check_conflict (attr, NULL, where);
1005 gfc_add_optional (symbol_attribute *attr, locus *where)
1008 if (check_used (attr, NULL, where))
1013 duplicate_attr ("OPTIONAL", where);
1018 return check_conflict (attr, NULL, where);
1023 gfc_add_pointer (symbol_attribute *attr, locus *where)
1026 if (check_used (attr, NULL, where))
1029 if (attr->pointer && !(attr->if_source == IFSRC_IFBODY
1030 && gfc_find_state (COMP_INTERFACE) == FAILURE))
1032 duplicate_attr ("POINTER", where);
1036 if (attr->procedure || (attr->external && attr->if_source != IFSRC_IFBODY)
1037 || (attr->if_source == IFSRC_IFBODY
1038 && gfc_find_state (COMP_INTERFACE) == FAILURE))
1039 attr->proc_pointer = 1;
1043 return check_conflict (attr, NULL, where);
1048 gfc_add_cray_pointer (symbol_attribute *attr, locus *where)
1051 if (check_used (attr, NULL, where))
1054 attr->cray_pointer = 1;
1055 return check_conflict (attr, NULL, where);
1060 gfc_add_cray_pointee (symbol_attribute *attr, locus *where)
1063 if (check_used (attr, NULL, where))
1066 if (attr->cray_pointee)
1068 gfc_error ("Cray Pointee at %L appears in multiple pointer()"
1069 " statements", where);
1073 attr->cray_pointee = 1;
1074 return check_conflict (attr, NULL, where);
1079 gfc_add_protected (symbol_attribute *attr, const char *name, locus *where)
1081 if (check_used (attr, name, where))
1084 if (attr->is_protected)
1086 if (gfc_notify_std (GFC_STD_LEGACY,
1087 "Duplicate PROTECTED attribute specified at %L",
1093 attr->is_protected = 1;
1094 return check_conflict (attr, name, where);
1099 gfc_add_result (symbol_attribute *attr, const char *name, locus *where)
1102 if (check_used (attr, name, where))
1106 return check_conflict (attr, name, where);
1111 gfc_add_save (symbol_attribute *attr, save_state s, const char *name,
1115 if (check_used (attr, name, where))
1118 if (s == SAVE_EXPLICIT && gfc_pure (NULL))
1121 ("SAVE attribute at %L cannot be specified in a PURE procedure",
1126 if (s == SAVE_EXPLICIT && gfc_implicit_pure (NULL))
1127 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1129 if (s == SAVE_EXPLICIT && attr->save == SAVE_EXPLICIT)
1131 if (gfc_notify_std (GFC_STD_LEGACY,
1132 "Duplicate SAVE attribute specified at %L",
1139 return check_conflict (attr, name, where);
1144 gfc_add_value (symbol_attribute *attr, const char *name, locus *where)
1147 if (check_used (attr, name, where))
1152 if (gfc_notify_std (GFC_STD_LEGACY,
1153 "Duplicate VALUE attribute specified at %L",
1160 return check_conflict (attr, name, where);
1165 gfc_add_volatile (symbol_attribute *attr, const char *name, locus *where)
1167 /* No check_used needed as 11.2.1 of the F2003 standard allows
1168 that the local identifier made accessible by a use statement can be
1169 given a VOLATILE attribute - unless it is a coarray (F2008, C560). */
1171 if (attr->volatile_ && attr->volatile_ns == gfc_current_ns)
1172 if (gfc_notify_std (GFC_STD_LEGACY,
1173 "Duplicate VOLATILE attribute specified at %L", where)
1177 attr->volatile_ = 1;
1178 attr->volatile_ns = gfc_current_ns;
1179 return check_conflict (attr, name, where);
1184 gfc_add_asynchronous (symbol_attribute *attr, const char *name, locus *where)
1186 /* No check_used needed as 11.2.1 of the F2003 standard allows
1187 that the local identifier made accessible by a use statement can be
1188 given a ASYNCHRONOUS attribute. */
1190 if (attr->asynchronous && attr->asynchronous_ns == gfc_current_ns)
1191 if (gfc_notify_std (GFC_STD_LEGACY,
1192 "Duplicate ASYNCHRONOUS attribute specified at %L",
1196 attr->asynchronous = 1;
1197 attr->asynchronous_ns = gfc_current_ns;
1198 return check_conflict (attr, name, where);
1203 gfc_add_threadprivate (symbol_attribute *attr, const char *name, locus *where)
1206 if (check_used (attr, name, where))
1209 if (attr->threadprivate)
1211 duplicate_attr ("THREADPRIVATE", where);
1215 attr->threadprivate = 1;
1216 return check_conflict (attr, name, where);
1221 gfc_add_target (symbol_attribute *attr, locus *where)
1224 if (check_used (attr, NULL, where))
1229 duplicate_attr ("TARGET", where);
1234 return check_conflict (attr, NULL, where);
1239 gfc_add_dummy (symbol_attribute *attr, const char *name, locus *where)
1242 if (check_used (attr, name, where))
1245 /* Duplicate dummy arguments are allowed due to ENTRY statements. */
1247 return check_conflict (attr, name, where);
1252 gfc_add_in_common (symbol_attribute *attr, const char *name, locus *where)
1255 if (check_used (attr, name, where))
1258 /* Duplicate attribute already checked for. */
1259 attr->in_common = 1;
1260 return check_conflict (attr, name, where);
1265 gfc_add_in_equivalence (symbol_attribute *attr, const char *name, locus *where)
1268 /* Duplicate attribute already checked for. */
1269 attr->in_equivalence = 1;
1270 if (check_conflict (attr, name, where) == FAILURE)
1273 if (attr->flavor == FL_VARIABLE)
1276 return gfc_add_flavor (attr, FL_VARIABLE, name, where);
1281 gfc_add_data (symbol_attribute *attr, const char *name, locus *where)
1284 if (check_used (attr, name, where))
1288 return check_conflict (attr, name, where);
1293 gfc_add_in_namelist (symbol_attribute *attr, const char *name, locus *where)
1296 attr->in_namelist = 1;
1297 return check_conflict (attr, name, where);
1302 gfc_add_sequence (symbol_attribute *attr, const char *name, locus *where)
1305 if (check_used (attr, name, where))
1309 return check_conflict (attr, name, where);
1314 gfc_add_elemental (symbol_attribute *attr, locus *where)
1317 if (check_used (attr, NULL, where))
1320 if (attr->elemental)
1322 duplicate_attr ("ELEMENTAL", where);
1326 attr->elemental = 1;
1327 return check_conflict (attr, NULL, where);
1332 gfc_add_pure (symbol_attribute *attr, locus *where)
1335 if (check_used (attr, NULL, where))
1340 duplicate_attr ("PURE", where);
1345 return check_conflict (attr, NULL, where);
1350 gfc_add_recursive (symbol_attribute *attr, locus *where)
1353 if (check_used (attr, NULL, where))
1356 if (attr->recursive)
1358 duplicate_attr ("RECURSIVE", where);
1362 attr->recursive = 1;
1363 return check_conflict (attr, NULL, where);
1368 gfc_add_entry (symbol_attribute *attr, const char *name, locus *where)
1371 if (check_used (attr, name, where))
1376 duplicate_attr ("ENTRY", where);
1381 return check_conflict (attr, name, where);
1386 gfc_add_function (symbol_attribute *attr, const char *name, locus *where)
1389 if (attr->flavor != FL_PROCEDURE
1390 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1394 return check_conflict (attr, name, where);
1399 gfc_add_subroutine (symbol_attribute *attr, const char *name, locus *where)
1402 if (attr->flavor != FL_PROCEDURE
1403 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1406 attr->subroutine = 1;
1407 return check_conflict (attr, name, where);
1412 gfc_add_generic (symbol_attribute *attr, const char *name, locus *where)
1415 if (attr->flavor != FL_PROCEDURE
1416 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1420 return check_conflict (attr, name, where);
1425 gfc_add_proc (symbol_attribute *attr, const char *name, locus *where)
1428 if (check_used (attr, NULL, where))
1431 if (attr->flavor != FL_PROCEDURE
1432 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1435 if (attr->procedure)
1437 duplicate_attr ("PROCEDURE", where);
1441 attr->procedure = 1;
1443 return check_conflict (attr, NULL, where);
1448 gfc_add_abstract (symbol_attribute* attr, locus* where)
1452 duplicate_attr ("ABSTRACT", where);
1461 /* Flavors are special because some flavors are not what Fortran
1462 considers attributes and can be reaffirmed multiple times. */
1465 gfc_add_flavor (symbol_attribute *attr, sym_flavor f, const char *name,
1469 if ((f == FL_PROGRAM || f == FL_BLOCK_DATA || f == FL_MODULE
1470 || f == FL_PARAMETER || f == FL_LABEL || f == FL_DERIVED
1471 || f == FL_NAMELIST) && check_used (attr, name, where))
1474 if (attr->flavor == f && f == FL_VARIABLE)
1477 if (attr->flavor != FL_UNKNOWN)
1480 where = &gfc_current_locus;
1483 gfc_error ("%s attribute of '%s' conflicts with %s attribute at %L",
1484 gfc_code2string (flavors, attr->flavor), name,
1485 gfc_code2string (flavors, f), where);
1487 gfc_error ("%s attribute conflicts with %s attribute at %L",
1488 gfc_code2string (flavors, attr->flavor),
1489 gfc_code2string (flavors, f), where);
1496 return check_conflict (attr, name, where);
1501 gfc_add_procedure (symbol_attribute *attr, procedure_type t,
1502 const char *name, locus *where)
1505 if (check_used (attr, name, where))
1508 if (attr->flavor != FL_PROCEDURE
1509 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1513 where = &gfc_current_locus;
1515 if (attr->proc != PROC_UNKNOWN)
1517 gfc_error ("%s procedure at %L is already declared as %s procedure",
1518 gfc_code2string (procedures, t), where,
1519 gfc_code2string (procedures, attr->proc));
1526 /* Statement functions are always scalar and functions. */
1527 if (t == PROC_ST_FUNCTION
1528 && ((!attr->function && gfc_add_function (attr, name, where) == FAILURE)
1529 || attr->dimension))
1532 return check_conflict (attr, name, where);
1537 gfc_add_intent (symbol_attribute *attr, sym_intent intent, locus *where)
1540 if (check_used (attr, NULL, where))
1543 if (attr->intent == INTENT_UNKNOWN)
1545 attr->intent = intent;
1546 return check_conflict (attr, NULL, where);
1550 where = &gfc_current_locus;
1552 gfc_error ("INTENT (%s) conflicts with INTENT(%s) at %L",
1553 gfc_intent_string (attr->intent),
1554 gfc_intent_string (intent), where);
1560 /* No checks for use-association in public and private statements. */
1563 gfc_add_access (symbol_attribute *attr, gfc_access access,
1564 const char *name, locus *where)
1567 if (attr->access == ACCESS_UNKNOWN
1568 || (attr->use_assoc && attr->access != ACCESS_PRIVATE))
1570 attr->access = access;
1571 return check_conflict (attr, name, where);
1575 where = &gfc_current_locus;
1576 gfc_error ("ACCESS specification at %L was already specified", where);
1582 /* Set the is_bind_c field for the given symbol_attribute. */
1585 gfc_add_is_bind_c (symbol_attribute *attr, const char *name, locus *where,
1586 int is_proc_lang_bind_spec)
1589 if (is_proc_lang_bind_spec == 0 && attr->flavor == FL_PROCEDURE)
1590 gfc_error_now ("BIND(C) attribute at %L can only be used for "
1591 "variables or common blocks", where);
1592 else if (attr->is_bind_c)
1593 gfc_error_now ("Duplicate BIND attribute specified at %L", where);
1595 attr->is_bind_c = 1;
1598 where = &gfc_current_locus;
1600 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BIND(C) at %L", where)
1604 return check_conflict (attr, name, where);
1608 /* Set the extension field for the given symbol_attribute. */
1611 gfc_add_extension (symbol_attribute *attr, locus *where)
1614 where = &gfc_current_locus;
1616 if (attr->extension)
1617 gfc_error_now ("Duplicate EXTENDS attribute specified at %L", where);
1619 attr->extension = 1;
1621 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: EXTENDS at %L", where)
1630 gfc_add_explicit_interface (gfc_symbol *sym, ifsrc source,
1631 gfc_formal_arglist * formal, locus *where)
1634 if (check_used (&sym->attr, sym->name, where))
1638 where = &gfc_current_locus;
1640 if (sym->attr.if_source != IFSRC_UNKNOWN
1641 && sym->attr.if_source != IFSRC_DECL)
1643 gfc_error ("Symbol '%s' at %L already has an explicit interface",
1648 if (source == IFSRC_IFBODY && (sym->attr.dimension || sym->attr.allocatable))
1650 gfc_error ("'%s' at %L has attributes specified outside its INTERFACE "
1651 "body", sym->name, where);
1655 sym->formal = formal;
1656 sym->attr.if_source = source;
1662 /* Add a type to a symbol. */
1665 gfc_add_type (gfc_symbol *sym, gfc_typespec *ts, locus *where)
1671 where = &gfc_current_locus;
1674 type = sym->result->ts.type;
1676 type = sym->ts.type;
1678 if (sym->attr.result && type == BT_UNKNOWN && sym->ns->proc_name)
1679 type = sym->ns->proc_name->ts.type;
1681 if (type != BT_UNKNOWN && !(sym->attr.function && sym->attr.implicit_type))
1683 if (sym->attr.use_assoc)
1684 gfc_error ("Symbol '%s' at %L conflicts with symbol from module '%s', "
1685 "use-associated at %L", sym->name, where, sym->module,
1688 gfc_error ("Symbol '%s' at %L already has basic type of %s", sym->name,
1689 where, gfc_basic_typename (type));
1693 if (sym->attr.procedure && sym->ts.interface)
1695 gfc_error ("Procedure '%s' at %L may not have basic type of %s",
1696 sym->name, where, gfc_basic_typename (ts->type));
1700 flavor = sym->attr.flavor;
1702 if (flavor == FL_PROGRAM || flavor == FL_BLOCK_DATA || flavor == FL_MODULE
1703 || flavor == FL_LABEL
1704 || (flavor == FL_PROCEDURE && sym->attr.subroutine)
1705 || flavor == FL_DERIVED || flavor == FL_NAMELIST)
1707 gfc_error ("Symbol '%s' at %L cannot have a type", sym->name, where);
1716 /* Clears all attributes. */
1719 gfc_clear_attr (symbol_attribute *attr)
1721 memset (attr, 0, sizeof (symbol_attribute));
1725 /* Check for missing attributes in the new symbol. Currently does
1726 nothing, but it's not clear that it is unnecessary yet. */
1729 gfc_missing_attr (symbol_attribute *attr ATTRIBUTE_UNUSED,
1730 locus *where ATTRIBUTE_UNUSED)
1737 /* Copy an attribute to a symbol attribute, bit by bit. Some
1738 attributes have a lot of side-effects but cannot be present given
1739 where we are called from, so we ignore some bits. */
1742 gfc_copy_attr (symbol_attribute *dest, symbol_attribute *src, locus *where)
1744 int is_proc_lang_bind_spec;
1746 /* In line with the other attributes, we only add bits but do not remove
1747 them; cf. also PR 41034. */
1748 dest->ext_attr |= src->ext_attr;
1750 if (src->allocatable && gfc_add_allocatable (dest, where) == FAILURE)
1753 if (src->dimension && gfc_add_dimension (dest, NULL, where) == FAILURE)
1755 if (src->codimension && gfc_add_codimension (dest, NULL, where) == FAILURE)
1757 if (src->contiguous && gfc_add_contiguous (dest, NULL, where) == FAILURE)
1759 if (src->optional && gfc_add_optional (dest, where) == FAILURE)
1761 if (src->pointer && gfc_add_pointer (dest, where) == FAILURE)
1763 if (src->is_protected && gfc_add_protected (dest, NULL, where) == FAILURE)
1765 if (src->save && gfc_add_save (dest, src->save, NULL, where) == FAILURE)
1767 if (src->value && gfc_add_value (dest, NULL, where) == FAILURE)
1769 if (src->volatile_ && gfc_add_volatile (dest, NULL, where) == FAILURE)
1771 if (src->asynchronous && gfc_add_asynchronous (dest, NULL, where) == FAILURE)
1773 if (src->threadprivate
1774 && gfc_add_threadprivate (dest, NULL, where) == FAILURE)
1776 if (src->target && gfc_add_target (dest, where) == FAILURE)
1778 if (src->dummy && gfc_add_dummy (dest, NULL, where) == FAILURE)
1780 if (src->result && gfc_add_result (dest, NULL, where) == FAILURE)
1785 if (src->in_namelist && gfc_add_in_namelist (dest, NULL, where) == FAILURE)
1788 if (src->in_common && gfc_add_in_common (dest, NULL, where) == FAILURE)
1791 if (src->generic && gfc_add_generic (dest, NULL, where) == FAILURE)
1793 if (src->function && gfc_add_function (dest, NULL, where) == FAILURE)
1795 if (src->subroutine && gfc_add_subroutine (dest, NULL, where) == FAILURE)
1798 if (src->sequence && gfc_add_sequence (dest, NULL, where) == FAILURE)
1800 if (src->elemental && gfc_add_elemental (dest, where) == FAILURE)
1802 if (src->pure && gfc_add_pure (dest, where) == FAILURE)
1804 if (src->recursive && gfc_add_recursive (dest, where) == FAILURE)
1807 if (src->flavor != FL_UNKNOWN
1808 && gfc_add_flavor (dest, src->flavor, NULL, where) == FAILURE)
1811 if (src->intent != INTENT_UNKNOWN
1812 && gfc_add_intent (dest, src->intent, where) == FAILURE)
1815 if (src->access != ACCESS_UNKNOWN
1816 && gfc_add_access (dest, src->access, NULL, where) == FAILURE)
1819 if (gfc_missing_attr (dest, where) == FAILURE)
1822 if (src->cray_pointer && gfc_add_cray_pointer (dest, where) == FAILURE)
1824 if (src->cray_pointee && gfc_add_cray_pointee (dest, where) == FAILURE)
1827 is_proc_lang_bind_spec = (src->flavor == FL_PROCEDURE ? 1 : 0);
1829 && gfc_add_is_bind_c (dest, NULL, where, is_proc_lang_bind_spec)
1833 if (src->is_c_interop)
1834 dest->is_c_interop = 1;
1838 if (src->external && gfc_add_external (dest, where) == FAILURE)
1840 if (src->intrinsic && gfc_add_intrinsic (dest, where) == FAILURE)
1842 if (src->proc_pointer)
1843 dest->proc_pointer = 1;
1852 /************** Component name management ************/
1854 /* Component names of a derived type form their own little namespaces
1855 that are separate from all other spaces. The space is composed of
1856 a singly linked list of gfc_component structures whose head is
1857 located in the parent symbol. */
1860 /* Add a component name to a symbol. The call fails if the name is
1861 already present. On success, the component pointer is modified to
1862 point to the additional component structure. */
1865 gfc_add_component (gfc_symbol *sym, const char *name,
1866 gfc_component **component)
1868 gfc_component *p, *tail;
1872 for (p = sym->components; p; p = p->next)
1874 if (strcmp (p->name, name) == 0)
1876 gfc_error ("Component '%s' at %C already declared at %L",
1884 if (sym->attr.extension
1885 && gfc_find_component (sym->components->ts.u.derived, name, true, true))
1887 gfc_error ("Component '%s' at %C already in the parent type "
1888 "at %L", name, &sym->components->ts.u.derived->declared_at);
1892 /* Allocate a new component. */
1893 p = gfc_get_component ();
1896 sym->components = p;
1900 p->name = gfc_get_string (name);
1901 p->loc = gfc_current_locus;
1902 p->ts.type = BT_UNKNOWN;
1909 /* Recursive function to switch derived types of all symbol in a
1913 switch_types (gfc_symtree *st, gfc_symbol *from, gfc_symbol *to)
1921 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived == from)
1922 sym->ts.u.derived = to;
1924 switch_types (st->left, from, to);
1925 switch_types (st->right, from, to);
1929 /* This subroutine is called when a derived type is used in order to
1930 make the final determination about which version to use. The
1931 standard requires that a type be defined before it is 'used', but
1932 such types can appear in IMPLICIT statements before the actual
1933 definition. 'Using' in this context means declaring a variable to
1934 be that type or using the type constructor.
1936 If a type is used and the components haven't been defined, then we
1937 have to have a derived type in a parent unit. We find the node in
1938 the other namespace and point the symtree node in this namespace to
1939 that node. Further reference to this name point to the correct
1940 node. If we can't find the node in a parent namespace, then we have
1943 This subroutine takes a pointer to a symbol node and returns a
1944 pointer to the translated node or NULL for an error. Usually there
1945 is no translation and we return the node we were passed. */
1948 gfc_use_derived (gfc_symbol *sym)
1958 if (sym->attr.generic)
1959 sym = gfc_find_dt_in_generic (sym);
1961 if (sym->components != NULL || sym->attr.zero_comp)
1962 return sym; /* Already defined. */
1964 if (sym->ns->parent == NULL)
1967 if (gfc_find_symbol (sym->name, sym->ns->parent, 1, &s))
1969 gfc_error ("Symbol '%s' at %C is ambiguous", sym->name);
1973 if (s == NULL || s->attr.flavor != FL_DERIVED)
1976 /* Get rid of symbol sym, translating all references to s. */
1977 for (i = 0; i < GFC_LETTERS; i++)
1979 t = &sym->ns->default_type[i];
1980 if (t->u.derived == sym)
1984 st = gfc_find_symtree (sym->ns->sym_root, sym->name);
1989 /* Unlink from list of modified symbols. */
1990 gfc_commit_symbol (sym);
1992 switch_types (sym->ns->sym_root, sym, s);
1994 /* TODO: Also have to replace sym -> s in other lists like
1995 namelists, common lists and interface lists. */
1996 gfc_free_symbol (sym);
2001 gfc_error ("Derived type '%s' at %C is being used before it is defined",
2007 /* Given a derived type node and a component name, try to locate the
2008 component structure. Returns the NULL pointer if the component is
2009 not found or the components are private. If noaccess is set, no access
2013 gfc_find_component (gfc_symbol *sym, const char *name,
2014 bool noaccess, bool silent)
2018 if (name == NULL || sym == NULL)
2021 sym = gfc_use_derived (sym);
2026 for (p = sym->components; p; p = p->next)
2027 if (strcmp (p->name, name) == 0)
2030 if (p && sym->attr.use_assoc && !noaccess)
2032 bool is_parent_comp = sym->attr.extension && (p == sym->components);
2033 if (p->attr.access == ACCESS_PRIVATE ||
2034 (p->attr.access != ACCESS_PUBLIC
2035 && sym->component_access == ACCESS_PRIVATE
2036 && !is_parent_comp))
2039 gfc_error ("Component '%s' at %C is a PRIVATE component of '%s'",
2046 && sym->attr.extension
2047 && sym->components->ts.type == BT_DERIVED)
2049 p = gfc_find_component (sym->components->ts.u.derived, name,
2051 /* Do not overwrite the error. */
2056 if (p == NULL && !silent)
2057 gfc_error ("'%s' at %C is not a member of the '%s' structure",
2064 /* Given a symbol, free all of the component structures and everything
2068 free_components (gfc_component *p)
2076 gfc_free_array_spec (p->as);
2077 gfc_free_expr (p->initializer);
2079 gfc_free_formal_arglist (p->formal);
2080 gfc_free_namespace (p->formal_ns);
2087 /******************** Statement label management ********************/
2089 /* Comparison function for statement labels, used for managing the
2093 compare_st_labels (void *a1, void *b1)
2095 int a = ((gfc_st_label *) a1)->value;
2096 int b = ((gfc_st_label *) b1)->value;
2102 /* Free a single gfc_st_label structure, making sure the tree is not
2103 messed up. This function is called only when some parse error
2107 gfc_free_st_label (gfc_st_label *label)
2113 gfc_delete_bbt (&gfc_current_ns->st_labels, label, compare_st_labels);
2115 if (label->format != NULL)
2116 gfc_free_expr (label->format);
2122 /* Free a whole tree of gfc_st_label structures. */
2125 free_st_labels (gfc_st_label *label)
2131 free_st_labels (label->left);
2132 free_st_labels (label->right);
2134 if (label->format != NULL)
2135 gfc_free_expr (label->format);
2140 /* Given a label number, search for and return a pointer to the label
2141 structure, creating it if it does not exist. */
2144 gfc_get_st_label (int labelno)
2149 if (gfc_current_state () == COMP_DERIVED)
2150 ns = gfc_current_block ()->f2k_derived;
2153 /* Find the namespace of the scoping unit:
2154 If we're in a BLOCK construct, jump to the parent namespace. */
2155 ns = gfc_current_ns;
2156 while (ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL)
2160 /* First see if the label is already in this namespace. */
2164 if (lp->value == labelno)
2167 if (lp->value < labelno)
2173 lp = XCNEW (gfc_st_label);
2175 lp->value = labelno;
2176 lp->defined = ST_LABEL_UNKNOWN;
2177 lp->referenced = ST_LABEL_UNKNOWN;
2179 gfc_insert_bbt (&ns->st_labels, lp, compare_st_labels);
2185 /* Called when a statement with a statement label is about to be
2186 accepted. We add the label to the list of the current namespace,
2187 making sure it hasn't been defined previously and referenced
2191 gfc_define_st_label (gfc_st_label *lp, gfc_sl_type type, locus *label_locus)
2195 labelno = lp->value;
2197 if (lp->defined != ST_LABEL_UNKNOWN)
2198 gfc_error ("Duplicate statement label %d at %L and %L", labelno,
2199 &lp->where, label_locus);
2202 lp->where = *label_locus;
2206 case ST_LABEL_FORMAT:
2207 if (lp->referenced == ST_LABEL_TARGET)
2208 gfc_error ("Label %d at %C already referenced as branch target",
2211 lp->defined = ST_LABEL_FORMAT;
2215 case ST_LABEL_TARGET:
2216 if (lp->referenced == ST_LABEL_FORMAT)
2217 gfc_error ("Label %d at %C already referenced as a format label",
2220 lp->defined = ST_LABEL_TARGET;
2225 lp->defined = ST_LABEL_BAD_TARGET;
2226 lp->referenced = ST_LABEL_BAD_TARGET;
2232 /* Reference a label. Given a label and its type, see if that
2233 reference is consistent with what is known about that label,
2234 updating the unknown state. Returns FAILURE if something goes
2238 gfc_reference_st_label (gfc_st_label *lp, gfc_sl_type type)
2240 gfc_sl_type label_type;
2247 labelno = lp->value;
2249 if (lp->defined != ST_LABEL_UNKNOWN)
2250 label_type = lp->defined;
2253 label_type = lp->referenced;
2254 lp->where = gfc_current_locus;
2257 if (label_type == ST_LABEL_FORMAT && type == ST_LABEL_TARGET)
2259 gfc_error ("Label %d at %C previously used as a FORMAT label", labelno);
2264 if ((label_type == ST_LABEL_TARGET || label_type == ST_LABEL_BAD_TARGET)
2265 && type == ST_LABEL_FORMAT)
2267 gfc_error ("Label %d at %C previously used as branch target", labelno);
2272 lp->referenced = type;
2280 /************** Symbol table management subroutines ****************/
2282 /* Basic details: Fortran 95 requires a potentially unlimited number
2283 of distinct namespaces when compiling a program unit. This case
2284 occurs during a compilation of internal subprograms because all of
2285 the internal subprograms must be read before we can start
2286 generating code for the host.
2288 Given the tricky nature of the Fortran grammar, we must be able to
2289 undo changes made to a symbol table if the current interpretation
2290 of a statement is found to be incorrect. Whenever a symbol is
2291 looked up, we make a copy of it and link to it. All of these
2292 symbols are kept in a singly linked list so that we can commit or
2293 undo the changes at a later time.
2295 A symtree may point to a symbol node outside of its namespace. In
2296 this case, that symbol has been used as a host associated variable
2297 at some previous time. */
2299 /* Allocate a new namespace structure. Copies the implicit types from
2300 PARENT if PARENT_TYPES is set. */
2303 gfc_get_namespace (gfc_namespace *parent, int parent_types)
2310 ns = XCNEW (gfc_namespace);
2311 ns->sym_root = NULL;
2312 ns->uop_root = NULL;
2313 ns->tb_sym_root = NULL;
2314 ns->finalizers = NULL;
2315 ns->default_access = ACCESS_UNKNOWN;
2316 ns->parent = parent;
2318 for (in = GFC_INTRINSIC_BEGIN; in != GFC_INTRINSIC_END; in++)
2320 ns->operator_access[in] = ACCESS_UNKNOWN;
2321 ns->tb_op[in] = NULL;
2324 /* Initialize default implicit types. */
2325 for (i = 'a'; i <= 'z'; i++)
2327 ns->set_flag[i - 'a'] = 0;
2328 ts = &ns->default_type[i - 'a'];
2330 if (parent_types && ns->parent != NULL)
2332 /* Copy parent settings. */
2333 *ts = ns->parent->default_type[i - 'a'];
2337 if (gfc_option.flag_implicit_none != 0)
2343 if ('i' <= i && i <= 'n')
2345 ts->type = BT_INTEGER;
2346 ts->kind = gfc_default_integer_kind;
2351 ts->kind = gfc_default_real_kind;
2361 /* Comparison function for symtree nodes. */
2364 compare_symtree (void *_st1, void *_st2)
2366 gfc_symtree *st1, *st2;
2368 st1 = (gfc_symtree *) _st1;
2369 st2 = (gfc_symtree *) _st2;
2371 return strcmp (st1->name, st2->name);
2375 /* Allocate a new symtree node and associate it with the new symbol. */
2378 gfc_new_symtree (gfc_symtree **root, const char *name)
2382 st = XCNEW (gfc_symtree);
2383 st->name = gfc_get_string (name);
2385 gfc_insert_bbt (root, st, compare_symtree);
2390 /* Delete a symbol from the tree. Does not free the symbol itself! */
2393 gfc_delete_symtree (gfc_symtree **root, const char *name)
2395 gfc_symtree st, *st0;
2397 st0 = gfc_find_symtree (*root, name);
2399 st.name = gfc_get_string (name);
2400 gfc_delete_bbt (root, &st, compare_symtree);
2406 /* Given a root symtree node and a name, try to find the symbol within
2407 the namespace. Returns NULL if the symbol is not found. */
2410 gfc_find_symtree (gfc_symtree *st, const char *name)
2416 c = strcmp (name, st->name);
2420 st = (c < 0) ? st->left : st->right;
2427 /* Return a symtree node with a name that is guaranteed to be unique
2428 within the namespace and corresponds to an illegal fortran name. */
2431 gfc_get_unique_symtree (gfc_namespace *ns)
2433 char name[GFC_MAX_SYMBOL_LEN + 1];
2434 static int serial = 0;
2436 sprintf (name, "@%d", serial++);
2437 return gfc_new_symtree (&ns->sym_root, name);
2441 /* Given a name find a user operator node, creating it if it doesn't
2442 exist. These are much simpler than symbols because they can't be
2443 ambiguous with one another. */
2446 gfc_get_uop (const char *name)
2451 st = gfc_find_symtree (gfc_current_ns->uop_root, name);
2455 st = gfc_new_symtree (&gfc_current_ns->uop_root, name);
2457 uop = st->n.uop = XCNEW (gfc_user_op);
2458 uop->name = gfc_get_string (name);
2459 uop->access = ACCESS_UNKNOWN;
2460 uop->ns = gfc_current_ns;
2466 /* Given a name find the user operator node. Returns NULL if it does
2470 gfc_find_uop (const char *name, gfc_namespace *ns)
2475 ns = gfc_current_ns;
2477 st = gfc_find_symtree (ns->uop_root, name);
2478 return (st == NULL) ? NULL : st->n.uop;
2482 /* Remove a gfc_symbol structure and everything it points to. */
2485 gfc_free_symbol (gfc_symbol *sym)
2491 gfc_free_array_spec (sym->as);
2493 free_components (sym->components);
2495 gfc_free_expr (sym->value);
2497 gfc_free_namelist (sym->namelist);
2499 gfc_free_namespace (sym->formal_ns);
2501 if (!sym->attr.generic_copy)
2502 gfc_free_interface (sym->generic);
2504 gfc_free_formal_arglist (sym->formal);
2506 gfc_free_namespace (sym->f2k_derived);
2512 /* Decrease the reference counter and free memory when we reach zero. */
2515 gfc_release_symbol (gfc_symbol *sym)
2520 if (sym->formal_ns != NULL && sym->refs == 2)
2522 /* As formal_ns contains a reference to sym, delete formal_ns just
2523 before the deletion of sym. */
2524 gfc_namespace *ns = sym->formal_ns;
2525 sym->formal_ns = NULL;
2526 gfc_free_namespace (ns);
2533 gcc_assert (sym->refs == 0);
2534 gfc_free_symbol (sym);
2538 /* Allocate and initialize a new symbol node. */
2541 gfc_new_symbol (const char *name, gfc_namespace *ns)
2545 p = XCNEW (gfc_symbol);
2547 gfc_clear_ts (&p->ts);
2548 gfc_clear_attr (&p->attr);
2551 p->declared_at = gfc_current_locus;
2553 if (strlen (name) > GFC_MAX_SYMBOL_LEN)
2554 gfc_internal_error ("new_symbol(): Symbol name too long");
2556 p->name = gfc_get_string (name);
2558 /* Make sure flags for symbol being C bound are clear initially. */
2559 p->attr.is_bind_c = 0;
2560 p->attr.is_iso_c = 0;
2562 /* Clear the ptrs we may need. */
2563 p->common_block = NULL;
2564 p->f2k_derived = NULL;
2571 /* Generate an error if a symbol is ambiguous. */
2574 ambiguous_symbol (const char *name, gfc_symtree *st)
2577 if (st->n.sym->module)
2578 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2579 "from module '%s'", name, st->n.sym->name, st->n.sym->module);
2581 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2582 "from current program unit", name, st->n.sym->name);
2586 /* If we're in a SELECT TYPE block, check if the variable 'st' matches any
2587 selector on the stack. If yes, replace it by the corresponding temporary. */
2590 select_type_insert_tmp (gfc_symtree **st)
2592 gfc_select_type_stack *stack = select_type_stack;
2593 for (; stack; stack = stack->prev)
2594 if ((*st)->n.sym == stack->selector && stack->tmp)
2599 /* Look for a symtree in the current procedure -- that is, go up to
2600 parent namespaces but only if inside a BLOCK. Returns NULL if not found. */
2603 gfc_find_symtree_in_proc (const char* name, gfc_namespace* ns)
2607 gfc_symtree* st = gfc_find_symtree (ns->sym_root, name);
2611 if (!ns->construct_entities)
2620 /* Search for a symtree starting in the current namespace, resorting to
2621 any parent namespaces if requested by a nonzero parent_flag.
2622 Returns nonzero if the name is ambiguous. */
2625 gfc_find_sym_tree (const char *name, gfc_namespace *ns, int parent_flag,
2626 gfc_symtree **result)
2631 ns = gfc_current_ns;
2635 st = gfc_find_symtree (ns->sym_root, name);
2638 select_type_insert_tmp (&st);
2641 /* Ambiguous generic interfaces are permitted, as long
2642 as the specific interfaces are different. */
2643 if (st->ambiguous && !st->n.sym->attr.generic)
2645 ambiguous_symbol (name, st);
2664 /* Same, but returns the symbol instead. */
2667 gfc_find_symbol (const char *name, gfc_namespace *ns, int parent_flag,
2668 gfc_symbol **result)
2673 i = gfc_find_sym_tree (name, ns, parent_flag, &st);
2678 *result = st->n.sym;
2684 /* Save symbol with the information necessary to back it out. */
2687 save_symbol_data (gfc_symbol *sym)
2690 if (sym->gfc_new || sym->old_symbol != NULL)
2693 sym->old_symbol = XCNEW (gfc_symbol);
2694 *(sym->old_symbol) = *sym;
2696 sym->tlink = changed_syms;
2701 /* Given a name, find a symbol, or create it if it does not exist yet
2702 in the current namespace. If the symbol is found we make sure that
2705 The integer return code indicates
2707 1 The symbol name was ambiguous
2708 2 The name meant to be established was already host associated.
2710 So if the return value is nonzero, then an error was issued. */
2713 gfc_get_sym_tree (const char *name, gfc_namespace *ns, gfc_symtree **result,
2714 bool allow_subroutine)
2719 /* This doesn't usually happen during resolution. */
2721 ns = gfc_current_ns;
2723 /* Try to find the symbol in ns. */
2724 st = gfc_find_symtree (ns->sym_root, name);
2728 /* If not there, create a new symbol. */
2729 p = gfc_new_symbol (name, ns);
2731 /* Add to the list of tentative symbols. */
2732 p->old_symbol = NULL;
2733 p->tlink = changed_syms;
2738 st = gfc_new_symtree (&ns->sym_root, name);
2745 /* Make sure the existing symbol is OK. Ambiguous
2746 generic interfaces are permitted, as long as the
2747 specific interfaces are different. */
2748 if (st->ambiguous && !st->n.sym->attr.generic)
2750 ambiguous_symbol (name, st);
2755 if (p->ns != ns && (!p->attr.function || ns->proc_name != p)
2756 && !(allow_subroutine && p->attr.subroutine)
2757 && !(ns->proc_name && ns->proc_name->attr.if_source == IFSRC_IFBODY
2758 && (ns->has_import_set || p->attr.imported)))
2760 /* Symbol is from another namespace. */
2761 gfc_error ("Symbol '%s' at %C has already been host associated",
2768 /* Copy in case this symbol is changed. */
2769 save_symbol_data (p);
2778 gfc_get_symbol (const char *name, gfc_namespace *ns, gfc_symbol **result)
2783 i = gfc_get_sym_tree (name, ns, &st, false);
2788 *result = st->n.sym;
2795 /* Subroutine that searches for a symbol, creating it if it doesn't
2796 exist, but tries to host-associate the symbol if possible. */
2799 gfc_get_ha_sym_tree (const char *name, gfc_symtree **result)
2804 i = gfc_find_sym_tree (name, gfc_current_ns, 0, &st);
2808 save_symbol_data (st->n.sym);
2813 if (gfc_current_ns->parent != NULL)
2815 i = gfc_find_sym_tree (name, gfc_current_ns->parent, 1, &st);
2826 return gfc_get_sym_tree (name, gfc_current_ns, result, false);
2831 gfc_get_ha_symbol (const char *name, gfc_symbol **result)
2836 i = gfc_get_ha_sym_tree (name, &st);
2839 *result = st->n.sym;
2846 /* Undoes all the changes made to symbols in the current statement.
2847 This subroutine is made simpler due to the fact that attributes are
2848 never removed once added. */
2851 gfc_undo_symbols (void)
2853 gfc_symbol *p, *q, *old;
2854 tentative_tbp *tbp, *tbq;
2856 for (p = changed_syms; p; p = q)
2862 /* Symbol was new. */
2863 if (p->attr.in_common && p->common_block && p->common_block->head)
2865 /* If the symbol was added to any common block, it
2866 needs to be removed to stop the resolver looking
2867 for a (possibly) dead symbol. */
2869 if (p->common_block->head == p)
2870 p->common_block->head = p->common_next;
2873 gfc_symbol *cparent, *csym;
2875 cparent = p->common_block->head;
2876 csym = cparent->common_next;
2881 csym = csym->common_next;
2884 gcc_assert(cparent->common_next == p);
2886 cparent->common_next = csym->common_next;
2890 /* The derived type is saved in the symtree with the first
2891 letter capitalized; the all lower-case version to the
2892 derived type contains its associated generic function. */
2893 if (p->attr.flavor == FL_DERIVED)
2894 gfc_delete_symtree (&p->ns->sym_root, gfc_get_string ("%c%s",
2895 (char) TOUPPER ((unsigned char) p->name[0]),
2898 gfc_delete_symtree (&p->ns->sym_root, p->name);
2900 gfc_release_symbol (p);
2904 /* Restore previous state of symbol. Just copy simple stuff. */
2906 old = p->old_symbol;
2908 p->ts.type = old->ts.type;
2909 p->ts.kind = old->ts.kind;
2911 p->attr = old->attr;
2913 if (p->value != old->value)
2915 gfc_free_expr (old->value);
2919 if (p->as != old->as)
2922 gfc_free_array_spec (p->as);
2926 p->generic = old->generic;
2927 p->component_access = old->component_access;
2929 if (p->namelist != NULL && old->namelist == NULL)
2931 gfc_free_namelist (p->namelist);
2936 if (p->namelist_tail != old->namelist_tail)
2938 gfc_free_namelist (old->namelist_tail);
2939 old->namelist_tail->next = NULL;
2943 p->namelist_tail = old->namelist_tail;
2945 if (p->formal != old->formal)
2947 gfc_free_formal_arglist (p->formal);
2948 p->formal = old->formal;
2951 free (p->old_symbol);
2952 p->old_symbol = NULL;
2956 changed_syms = NULL;
2958 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
2961 /* Procedure is already marked `error' by default. */
2964 tentative_tbp_list = NULL;
2968 /* Free sym->old_symbol. sym->old_symbol is mostly a shallow copy of sym; the
2969 components of old_symbol that might need deallocation are the "allocatables"
2970 that are restored in gfc_undo_symbols(), with two exceptions: namelist and
2971 namelist_tail. In case these differ between old_symbol and sym, it's just
2972 because sym->namelist has gotten a few more items. */
2975 free_old_symbol (gfc_symbol *sym)
2978 if (sym->old_symbol == NULL)
2981 if (sym->old_symbol->as != sym->as)
2982 gfc_free_array_spec (sym->old_symbol->as);
2984 if (sym->old_symbol->value != sym->value)
2985 gfc_free_expr (sym->old_symbol->value);
2987 if (sym->old_symbol->formal != sym->formal)
2988 gfc_free_formal_arglist (sym->old_symbol->formal);
2990 free (sym->old_symbol);
2991 sym->old_symbol = NULL;
2995 /* Makes the changes made in the current statement permanent-- gets
2996 rid of undo information. */
2999 gfc_commit_symbols (void)
3002 tentative_tbp *tbp, *tbq;
3004 for (p = changed_syms; p; p = q)
3010 free_old_symbol (p);
3012 changed_syms = NULL;
3014 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
3017 tbp->proc->error = 0;
3020 tentative_tbp_list = NULL;
3024 /* Makes the changes made in one symbol permanent -- gets rid of undo
3028 gfc_commit_symbol (gfc_symbol *sym)
3032 if (changed_syms == sym)
3033 changed_syms = sym->tlink;
3036 for (p = changed_syms; p; p = p->tlink)
3037 if (p->tlink == sym)
3039 p->tlink = sym->tlink;
3048 free_old_symbol (sym);
3052 /* Recursively free trees containing type-bound procedures. */
3055 free_tb_tree (gfc_symtree *t)
3060 free_tb_tree (t->left);
3061 free_tb_tree (t->right);
3063 /* TODO: Free type-bound procedure structs themselves; probably needs some
3064 sort of ref-counting mechanism. */
3070 /* Recursive function that deletes an entire tree and all the common
3071 head structures it points to. */
3074 free_common_tree (gfc_symtree * common_tree)
3076 if (common_tree == NULL)
3079 free_common_tree (common_tree->left);
3080 free_common_tree (common_tree->right);
3086 /* Recursive function that deletes an entire tree and all the user
3087 operator nodes that it contains. */
3090 free_uop_tree (gfc_symtree *uop_tree)
3092 if (uop_tree == NULL)
3095 free_uop_tree (uop_tree->left);
3096 free_uop_tree (uop_tree->right);
3098 gfc_free_interface (uop_tree->n.uop->op);
3099 free (uop_tree->n.uop);
3104 /* Recursive function that deletes an entire tree and all the symbols
3105 that it contains. */
3108 free_sym_tree (gfc_symtree *sym_tree)
3110 if (sym_tree == NULL)
3113 free_sym_tree (sym_tree->left);
3114 free_sym_tree (sym_tree->right);
3116 gfc_release_symbol (sym_tree->n.sym);
3121 /* Free the derived type list. */
3124 gfc_free_dt_list (void)
3126 gfc_dt_list *dt, *n;
3128 for (dt = gfc_derived_types; dt; dt = n)
3134 gfc_derived_types = NULL;
3138 /* Free the gfc_equiv_info's. */
3141 gfc_free_equiv_infos (gfc_equiv_info *s)
3145 gfc_free_equiv_infos (s->next);
3150 /* Free the gfc_equiv_lists. */
3153 gfc_free_equiv_lists (gfc_equiv_list *l)
3157 gfc_free_equiv_lists (l->next);
3158 gfc_free_equiv_infos (l->equiv);
3163 /* Free a finalizer procedure list. */
3166 gfc_free_finalizer (gfc_finalizer* el)
3170 gfc_release_symbol (el->proc_sym);
3176 gfc_free_finalizer_list (gfc_finalizer* list)
3180 gfc_finalizer* current = list;
3182 gfc_free_finalizer (current);
3187 /* Create a new gfc_charlen structure and add it to a namespace.
3188 If 'old_cl' is given, the newly created charlen will be a copy of it. */
3191 gfc_new_charlen (gfc_namespace *ns, gfc_charlen *old_cl)
3194 cl = gfc_get_charlen ();
3199 /* Put into namespace, but don't allow reject_statement
3200 to free it if old_cl is given. */
3201 gfc_charlen **prev = &ns->cl_list;
3202 cl->next = ns->old_cl_list;
3203 while (*prev != ns->old_cl_list)
3204 prev = &(*prev)->next;
3206 ns->old_cl_list = cl;
3207 cl->length = gfc_copy_expr (old_cl->length);
3208 cl->length_from_typespec = old_cl->length_from_typespec;
3209 cl->backend_decl = old_cl->backend_decl;
3210 cl->passed_length = old_cl->passed_length;
3211 cl->resolved = old_cl->resolved;
3215 /* Put into namespace. */
3216 cl->next = ns->cl_list;
3224 /* Free the charlen list from cl to end (end is not freed).
3225 Free the whole list if end is NULL. */
3228 gfc_free_charlen (gfc_charlen *cl, gfc_charlen *end)
3232 for (; cl != end; cl = cl2)
3237 gfc_free_expr (cl->length);
3243 /* Free entry list structs. */
3246 free_entry_list (gfc_entry_list *el)
3248 gfc_entry_list *next;
3255 free_entry_list (next);
3259 /* Free a namespace structure and everything below it. Interface
3260 lists associated with intrinsic operators are not freed. These are
3261 taken care of when a specific name is freed. */
3264 gfc_free_namespace (gfc_namespace *ns)
3266 gfc_namespace *p, *q;
3275 gcc_assert (ns->refs == 0);
3277 gfc_free_statements (ns->code);
3279 free_sym_tree (ns->sym_root);
3280 free_uop_tree (ns->uop_root);
3281 free_common_tree (ns->common_root);
3282 free_tb_tree (ns->tb_sym_root);
3283 free_tb_tree (ns->tb_uop_root);
3284 gfc_free_finalizer_list (ns->finalizers);
3285 gfc_free_charlen (ns->cl_list, NULL);
3286 free_st_labels (ns->st_labels);
3288 free_entry_list (ns->entries);
3289 gfc_free_equiv (ns->equiv);
3290 gfc_free_equiv_lists (ns->equiv_lists);
3291 gfc_free_use_stmts (ns->use_stmts);
3293 for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++)
3294 gfc_free_interface (ns->op[i]);
3296 gfc_free_data (ns->data);
3300 /* Recursively free any contained namespaces. */
3305 gfc_free_namespace (q);
3311 gfc_symbol_init_2 (void)
3314 gfc_current_ns = gfc_get_namespace (NULL, 0);
3319 gfc_symbol_done_2 (void)
3322 gfc_free_namespace (gfc_current_ns);
3323 gfc_current_ns = NULL;
3324 gfc_free_dt_list ();
3328 /* Count how many nodes a symtree has. */
3331 count_st_nodes (const gfc_symtree *st)
3337 nodes = count_st_nodes (st->left);
3339 nodes += count_st_nodes (st->right);
3345 /* Convert symtree tree into symtree vector. */
3348 fill_st_vector (gfc_symtree *st, gfc_symtree **st_vec, unsigned node_cntr)
3353 node_cntr = fill_st_vector (st->left, st_vec, node_cntr);
3354 st_vec[node_cntr++] = st;
3355 node_cntr = fill_st_vector (st->right, st_vec, node_cntr);
3361 /* Traverse namespace. As the functions might modify the symtree, we store the
3362 symtree as a vector and operate on this vector. Note: We assume that
3363 sym_func or st_func never deletes nodes from the symtree - only adding is
3364 allowed. Additionally, newly added nodes are not traversed. */
3367 do_traverse_symtree (gfc_symtree *st, void (*st_func) (gfc_symtree *),
3368 void (*sym_func) (gfc_symbol *))
3370 gfc_symtree **st_vec;
3371 unsigned nodes, i, node_cntr;
3373 gcc_assert ((st_func && !sym_func) || (!st_func && sym_func));
3374 nodes = count_st_nodes (st);
3375 st_vec = XALLOCAVEC (gfc_symtree *, nodes);
3377 fill_st_vector (st, st_vec, node_cntr);
3382 for (i = 0; i < nodes; i++)
3383 st_vec[i]->n.sym->mark = 0;
3384 for (i = 0; i < nodes; i++)
3385 if (!st_vec[i]->n.sym->mark)
3387 (*sym_func) (st_vec[i]->n.sym);
3388 st_vec[i]->n.sym->mark = 1;
3392 for (i = 0; i < nodes; i++)
3393 (*st_func) (st_vec[i]);
3397 /* Recursively traverse the symtree nodes. */
3400 gfc_traverse_symtree (gfc_symtree *st, void (*st_func) (gfc_symtree *))
3402 do_traverse_symtree (st, st_func, NULL);
3406 /* Call a given function for all symbols in the namespace. We take
3407 care that each gfc_symbol node is called exactly once. */
3410 gfc_traverse_ns (gfc_namespace *ns, void (*sym_func) (gfc_symbol *))
3412 do_traverse_symtree (ns->sym_root, NULL, sym_func);
3416 /* Return TRUE when name is the name of an intrinsic type. */
3419 gfc_is_intrinsic_typename (const char *name)
3421 if (strcmp (name, "integer") == 0
3422 || strcmp (name, "real") == 0
3423 || strcmp (name, "character") == 0
3424 || strcmp (name, "logical") == 0
3425 || strcmp (name, "complex") == 0
3426 || strcmp (name, "doubleprecision") == 0
3427 || strcmp (name, "doublecomplex") == 0)
3434 /* Return TRUE if the symbol is an automatic variable. */
3437 gfc_is_var_automatic (gfc_symbol *sym)
3439 /* Pointer and allocatable variables are never automatic. */
3440 if (sym->attr.pointer || sym->attr.allocatable)
3442 /* Check for arrays with non-constant size. */
3443 if (sym->attr.dimension && sym->as
3444 && !gfc_is_compile_time_shape (sym->as))
3446 /* Check for non-constant length character variables. */
3447 if (sym->ts.type == BT_CHARACTER
3449 && !gfc_is_constant_expr (sym->ts.u.cl->length))
3454 /* Given a symbol, mark it as SAVEd if it is allowed. */
3457 save_symbol (gfc_symbol *sym)
3460 if (sym->attr.use_assoc)
3463 if (sym->attr.in_common
3466 || sym->attr.flavor != FL_VARIABLE)
3468 /* Automatic objects are not saved. */
3469 if (gfc_is_var_automatic (sym))
3471 gfc_add_save (&sym->attr, SAVE_EXPLICIT, sym->name, &sym->declared_at);
3475 /* Mark those symbols which can be SAVEd as such. */
3478 gfc_save_all (gfc_namespace *ns)
3480 gfc_traverse_ns (ns, save_symbol);
3484 /* Make sure that no changes to symbols are pending. */
3487 gfc_enforce_clean_symbol_state(void)
3489 gcc_assert (changed_syms == NULL);
3493 /************** Global symbol handling ************/
3496 /* Search a tree for the global symbol. */
3499 gfc_find_gsymbol (gfc_gsymbol *symbol, const char *name)
3508 c = strcmp (name, symbol->name);
3512 symbol = (c < 0) ? symbol->left : symbol->right;
3519 /* Compare two global symbols. Used for managing the BB tree. */
3522 gsym_compare (void *_s1, void *_s2)
3524 gfc_gsymbol *s1, *s2;
3526 s1 = (gfc_gsymbol *) _s1;
3527 s2 = (gfc_gsymbol *) _s2;
3528 return strcmp (s1->name, s2->name);
3532 /* Get a global symbol, creating it if it doesn't exist. */
3535 gfc_get_gsymbol (const char *name)
3539 s = gfc_find_gsymbol (gfc_gsym_root, name);
3543 s = XCNEW (gfc_gsymbol);
3544 s->type = GSYM_UNKNOWN;
3545 s->name = gfc_get_string (name);
3547 gfc_insert_bbt (&gfc_gsym_root, s, gsym_compare);
3554 get_iso_c_binding_dt (int sym_id)
3556 gfc_dt_list *dt_list;
3558 dt_list = gfc_derived_types;
3560 /* Loop through the derived types in the name list, searching for
3561 the desired symbol from iso_c_binding. Search the parent namespaces
3562 if necessary and requested to (parent_flag). */
3563 while (dt_list != NULL)
3565 if (dt_list->derived->from_intmod != INTMOD_NONE
3566 && dt_list->derived->intmod_sym_id == sym_id)
3567 return dt_list->derived;
3569 dt_list = dt_list->next;
3576 /* Verifies that the given derived type symbol, derived_sym, is interoperable
3577 with C. This is necessary for any derived type that is BIND(C) and for
3578 derived types that are parameters to functions that are BIND(C). All
3579 fields of the derived type are required to be interoperable, and are tested
3580 for such. If an error occurs, the errors are reported here, allowing for
3581 multiple errors to be handled for a single derived type. */
3584 verify_bind_c_derived_type (gfc_symbol *derived_sym)
3586 gfc_component *curr_comp = NULL;
3587 gfc_try is_c_interop = FAILURE;
3588 gfc_try retval = SUCCESS;
3590 if (derived_sym == NULL)
3591 gfc_internal_error ("verify_bind_c_derived_type(): Given symbol is "
3592 "unexpectedly NULL");
3594 /* If we've already looked at this derived symbol, do not look at it again
3595 so we don't repeat warnings/errors. */
3596 if (derived_sym->ts.is_c_interop)
3599 /* The derived type must have the BIND attribute to be interoperable
3600 J3/04-007, Section 15.2.3. */
3601 if (derived_sym->attr.is_bind_c != 1)
3603 derived_sym->ts.is_c_interop = 0;
3604 gfc_error_now ("Derived type '%s' declared at %L must have the BIND "
3605 "attribute to be C interoperable", derived_sym->name,
3606 &(derived_sym->declared_at));
3610 curr_comp = derived_sym->components;
3612 /* Fortran 2003 allows an empty derived type. C99 appears to disallow an
3613 empty struct. Section 15.2 in Fortran 2003 states: "The following
3614 subclauses define the conditions under which a Fortran entity is
3615 interoperable. If a Fortran entity is interoperable, an equivalent
3616 entity may be defined by means of C and the Fortran entity is said
3617 to be interoperable with the C entity. There does not have to be such
3618 an interoperating C entity."
3620 if (curr_comp == NULL)
3622 gfc_warning ("Derived type '%s' with BIND(C) attribute at %L is empty, "
3623 "and may be inaccessible by the C companion processor",
3624 derived_sym->name, &(derived_sym->declared_at));
3625 derived_sym->ts.is_c_interop = 1;
3626 derived_sym->attr.is_bind_c = 1;
3631 /* Initialize the derived type as being C interoperable.
3632 If we find an error in the components, this will be set false. */
3633 derived_sym->ts.is_c_interop = 1;
3635 /* Loop through the list of components to verify that the kind of
3636 each is a C interoperable type. */
3639 /* The components cannot be pointers (fortran sense).
3640 J3/04-007, Section 15.2.3, C1505. */
3641 if (curr_comp->attr.pointer != 0)
3643 gfc_error ("Component '%s' at %L cannot have the "
3644 "POINTER attribute because it is a member "
3645 "of the BIND(C) derived type '%s' at %L",
3646 curr_comp->name, &(curr_comp->loc),
3647 derived_sym->name, &(derived_sym->declared_at));
3651 if (curr_comp->attr.proc_pointer != 0)
3653 gfc_error ("Procedure pointer component '%s' at %L cannot be a member"
3654 " of the BIND(C) derived type '%s' at %L", curr_comp->name,
3655 &curr_comp->loc, derived_sym->name,
3656 &derived_sym->declared_at);
3660 /* The components cannot be allocatable.
3661 J3/04-007, Section 15.2.3, C1505. */
3662 if (curr_comp->attr.allocatable != 0)
3664 gfc_error ("Component '%s' at %L cannot have the "
3665 "ALLOCATABLE attribute because it is a member "
3666 "of the BIND(C) derived type '%s' at %L",
3667 curr_comp->name, &(curr_comp->loc),
3668 derived_sym->name, &(derived_sym->declared_at));
3672 /* BIND(C) derived types must have interoperable components. */
3673 if (curr_comp->ts.type == BT_DERIVED
3674 && curr_comp->ts.u.derived->ts.is_iso_c != 1
3675 && curr_comp->ts.u.derived != derived_sym)
3677 /* This should be allowed; the draft says a derived-type can not
3678 have type parameters if it is has the BIND attribute. Type
3679 parameters seem to be for making parameterized derived types.
3680 There's no need to verify the type if it is c_ptr/c_funptr. */
3681 retval = verify_bind_c_derived_type (curr_comp->ts.u.derived);
3685 /* Grab the typespec for the given component and test the kind. */
3686 is_c_interop = gfc_verify_c_interop (&(curr_comp->ts));
3688 if (is_c_interop != SUCCESS)
3690 /* Report warning and continue since not fatal. The
3691 draft does specify a constraint that requires all fields
3692 to interoperate, but if the user says real(4), etc., it
3693 may interoperate with *something* in C, but the compiler
3694 most likely won't know exactly what. Further, it may not
3695 interoperate with the same data type(s) in C if the user
3696 recompiles with different flags (e.g., -m32 and -m64 on
3697 x86_64 and using integer(4) to claim interop with a
3699 if (derived_sym->attr.is_bind_c == 1
3700 && gfc_option.warn_c_binding_type)
3701 /* If the derived type is bind(c), all fields must be
3703 gfc_warning ("Component '%s' in derived type '%s' at %L "
3704 "may not be C interoperable, even though "
3705 "derived type '%s' is BIND(C)",
3706 curr_comp->name, derived_sym->name,
3707 &(curr_comp->loc), derived_sym->name);
3708 else if (gfc_option.warn_c_binding_type)
3709 /* If derived type is param to bind(c) routine, or to one
3710 of the iso_c_binding procs, it must be interoperable, so
3711 all fields must interop too. */
3712 gfc_warning ("Component '%s' in derived type '%s' at %L "
3713 "may not be C interoperable",
3714 curr_comp->name, derived_sym->name,
3719 curr_comp = curr_comp->next;
3720 } while (curr_comp != NULL);
3723 /* Make sure we don't have conflicts with the attributes. */
3724 if (derived_sym->attr.access == ACCESS_PRIVATE)
3726 gfc_error ("Derived type '%s' at %L cannot be declared with both "
3727 "PRIVATE and BIND(C) attributes", derived_sym->name,
3728 &(derived_sym->declared_at));
3732 if (derived_sym->attr.sequence != 0)
3734 gfc_error ("Derived type '%s' at %L cannot have the SEQUENCE "
3735 "attribute because it is BIND(C)", derived_sym->name,
3736 &(derived_sym->declared_at));
3740 /* Mark the derived type as not being C interoperable if we found an
3741 error. If there were only warnings, proceed with the assumption
3742 it's interoperable. */
3743 if (retval == FAILURE)
3744 derived_sym->ts.is_c_interop = 0;
3750 /* Generate symbols for the named constants c_null_ptr and c_null_funptr. */
3753 gen_special_c_interop_ptr (int ptr_id, const char *ptr_name,
3754 const char *module_name)
3756 gfc_symtree *tmp_symtree;
3757 gfc_symbol *tmp_sym;
3760 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, ptr_name);
3762 if (tmp_symtree != NULL)
3763 tmp_sym = tmp_symtree->n.sym;
3767 gfc_internal_error ("gen_special_c_interop_ptr(): Unable to "
3768 "create symbol for %s", ptr_name);
3771 tmp_sym->ts.is_c_interop = 1;
3772 tmp_sym->attr.is_c_interop = 1;
3773 tmp_sym->ts.is_iso_c = 1;
3774 tmp_sym->ts.type = BT_DERIVED;
3775 tmp_sym->attr.flavor = FL_PARAMETER;
3777 /* The c_ptr and c_funptr derived types will provide the
3778 definition for c_null_ptr and c_null_funptr, respectively. */
3779 if (ptr_id == ISOCBINDING_NULL_PTR)
3780 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_PTR);
3782 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3783 if (tmp_sym->ts.u.derived == NULL)
3785 /* This can occur if the user forgot to declare c_ptr or
3786 c_funptr and they're trying to use one of the procedures
3787 that has arg(s) of the missing type. In this case, a
3788 regular version of the thing should have been put in the
3791 generate_isocbinding_symbol (module_name, ptr_id == ISOCBINDING_NULL_PTR
3792 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR,
3793 (const char *) (ptr_id == ISOCBINDING_NULL_PTR
3796 tmp_sym->ts.u.derived =
3797 get_iso_c_binding_dt (ptr_id == ISOCBINDING_NULL_PTR
3798 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR);
3801 /* Module name is some mangled version of iso_c_binding. */
3802 tmp_sym->module = gfc_get_string (module_name);
3804 /* Say it's from the iso_c_binding module. */
3805 tmp_sym->attr.is_iso_c = 1;
3807 tmp_sym->attr.use_assoc = 1;
3808 tmp_sym->attr.is_bind_c = 1;
3809 /* Since we never generate a call to this symbol, don't set the
3812 /* Set the c_address field of c_null_ptr and c_null_funptr to
3813 the value of NULL. */
3814 tmp_sym->value = gfc_get_expr ();
3815 tmp_sym->value->expr_type = EXPR_STRUCTURE;
3816 tmp_sym->value->ts.type = BT_DERIVED;
3817 tmp_sym->value->ts.u.derived = tmp_sym->ts.u.derived;
3818 gfc_constructor_append_expr (&tmp_sym->value->value.constructor, NULL, NULL);
3819 c = gfc_constructor_first (tmp_sym->value->value.constructor);
3820 c->expr = gfc_get_expr ();
3821 c->expr->expr_type = EXPR_NULL;
3822 c->expr->ts.is_iso_c = 1;
3828 /* Add a formal argument, gfc_formal_arglist, to the
3829 end of the given list of arguments. Set the reference to the
3830 provided symbol, param_sym, in the argument. */
3833 add_formal_arg (gfc_formal_arglist **head,
3834 gfc_formal_arglist **tail,
3835 gfc_formal_arglist *formal_arg,
3836 gfc_symbol *param_sym)
3838 /* Put in list, either as first arg or at the tail (curr arg). */
3840 *head = *tail = formal_arg;
3843 (*tail)->next = formal_arg;
3844 (*tail) = formal_arg;
3847 (*tail)->sym = param_sym;
3848 (*tail)->next = NULL;
3854 /* Generates a symbol representing the CPTR argument to an
3855 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3856 CPTR and add it to the provided argument list. */
3859 gen_cptr_param (gfc_formal_arglist **head,
3860 gfc_formal_arglist **tail,
3861 const char *module_name,
3862 gfc_namespace *ns, const char *c_ptr_name,
3865 gfc_symbol *param_sym = NULL;
3866 gfc_symbol *c_ptr_sym = NULL;
3867 gfc_symtree *param_symtree = NULL;
3868 gfc_formal_arglist *formal_arg = NULL;
3869 const char *c_ptr_in;
3870 const char *c_ptr_type = NULL;
3872 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3873 c_ptr_type = "c_funptr";
3875 c_ptr_type = "c_ptr";
3877 if(c_ptr_name == NULL)
3878 c_ptr_in = "gfc_cptr__";
3880 c_ptr_in = c_ptr_name;
3881 gfc_get_sym_tree (c_ptr_in, ns, ¶m_symtree, false);
3882 if (param_symtree != NULL)
3883 param_sym = param_symtree->n.sym;
3885 gfc_internal_error ("gen_cptr_param(): Unable to "
3886 "create symbol for %s", c_ptr_in);
3888 /* Set up the appropriate fields for the new c_ptr param sym. */
3890 param_sym->attr.flavor = FL_DERIVED;
3891 param_sym->ts.type = BT_DERIVED;
3892 param_sym->attr.intent = INTENT_IN;
3893 param_sym->attr.dummy = 1;
3895 /* This will pass the ptr to the iso_c routines as a (void *). */
3896 param_sym->attr.value = 1;
3897 param_sym->attr.use_assoc = 1;
3899 /* Get the symbol for c_ptr or c_funptr, no matter what it's name is
3901 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3902 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3904 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_PTR);
3905 if (c_ptr_sym == NULL)
3907 /* This can happen if the user did not define c_ptr but they are
3908 trying to use one of the iso_c_binding functions that need it. */
3909 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3910 generate_isocbinding_symbol (module_name, ISOCBINDING_FUNPTR,
3911 (const char *)c_ptr_type);
3913 generate_isocbinding_symbol (module_name, ISOCBINDING_PTR,
3914 (const char *)c_ptr_type);
3916 gfc_get_ha_symbol (c_ptr_type, &(c_ptr_sym));
3919 param_sym->ts.u.derived = c_ptr_sym;
3920 param_sym->module = gfc_get_string (module_name);
3922 /* Make new formal arg. */
3923 formal_arg = gfc_get_formal_arglist ();
3924 /* Add arg to list of formal args (the CPTR arg). */
3925 add_formal_arg (head, tail, formal_arg, param_sym);
3927 /* Validate changes. */
3928 gfc_commit_symbol (param_sym);
3932 /* Generates a symbol representing the FPTR argument to an
3933 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3934 FPTR and add it to the provided argument list. */
3937 gen_fptr_param (gfc_formal_arglist **head,
3938 gfc_formal_arglist **tail,
3939 const char *module_name,
3940 gfc_namespace *ns, const char *f_ptr_name, int proc)
3942 gfc_symbol *param_sym = NULL;
3943 gfc_symtree *param_symtree = NULL;
3944 gfc_formal_arglist *formal_arg = NULL;
3945 const char *f_ptr_out = "gfc_fptr__";
3947 if (f_ptr_name != NULL)
3948 f_ptr_out = f_ptr_name;
3950 gfc_get_sym_tree (f_ptr_out, ns, ¶m_symtree, false);
3951 if (param_symtree != NULL)
3952 param_sym = param_symtree->n.sym;
3954 gfc_internal_error ("generateFPtrParam(): Unable to "
3955 "create symbol for %s", f_ptr_out);
3957 /* Set up the necessary fields for the fptr output param sym. */
3960 param_sym->attr.proc_pointer = 1;
3962 param_sym->attr.pointer = 1;
3963 param_sym->attr.dummy = 1;
3964 param_sym->attr.use_assoc = 1;
3966 /* ISO C Binding type to allow any pointer type as actual param. */
3967 param_sym->ts.type = BT_VOID;
3968 param_sym->module = gfc_get_string (module_name);
3971 formal_arg = gfc_get_formal_arglist ();
3972 /* Add arg to list of formal args. */
3973 add_formal_arg (head, tail, formal_arg, param_sym);
3975 /* Validate changes. */
3976 gfc_commit_symbol (param_sym);
3980 /* Generates a symbol representing the optional SHAPE argument for the
3981 iso_c_binding c_f_pointer() procedure. Also, create a
3982 gfc_formal_arglist for the SHAPE and add it to the provided
3986 gen_shape_param (gfc_formal_arglist **head,
3987 gfc_formal_arglist **tail,
3988 const char *module_name,
3989 gfc_namespace *ns, const char *shape_param_name)
3991 gfc_symbol *param_sym = NULL;
3992 gfc_symtree *param_symtree = NULL;
3993 gfc_formal_arglist *formal_arg = NULL;
3994 const char *shape_param = "gfc_shape_array__";
3996 if (shape_param_name != NULL)
3997 shape_param = shape_param_name;
3999 gfc_get_sym_tree (shape_param, ns, ¶m_symtree, false);
4000 if (param_symtree != NULL)
4001 param_sym = param_symtree->n.sym;
4003 gfc_internal_error ("generateShapeParam(): Unable to "
4004 "create symbol for %s", shape_param);
4006 /* Set up the necessary fields for the shape input param sym. */
4008 param_sym->attr.dummy = 1;
4009 param_sym->attr.use_assoc = 1;
4011 /* Integer array, rank 1, describing the shape of the object. Make it's
4012 type BT_VOID initially so we can accept any type/kind combination of
4013 integer. During gfc_iso_c_sub_interface (resolve.c), we'll make it
4014 of BT_INTEGER type. */
4015 param_sym->ts.type = BT_VOID;
4017 /* Initialize the kind to default integer. However, it will be overridden
4018 during resolution to match the kind of the SHAPE parameter given as
4019 the actual argument (to allow for any valid integer kind). */
4020 param_sym->ts.kind = gfc_default_integer_kind;
4021 param_sym->as = gfc_get_array_spec ();
4023 param_sym->as->rank = 1;
4024 param_sym->as->lower[0] = gfc_get_int_expr (gfc_default_integer_kind,
4027 /* The extent is unknown until we get it. The length give us
4028 the rank the incoming pointer. */
4029 param_sym->as->type = AS_ASSUMED_SHAPE;
4031 /* The arg is also optional; it is required iff the second arg
4032 (fptr) is to an array, otherwise, it's ignored. */
4033 param_sym->attr.optional = 1;
4034 param_sym->attr.intent = INTENT_IN;
4035 param_sym->attr.dimension = 1;
4036 param_sym->module = gfc_get_string (module_name);
4039 formal_arg = gfc_get_formal_arglist ();
4040 /* Add arg to list of formal args. */
4041 add_formal_arg (head, tail, formal_arg, param_sym);
4043 /* Validate changes. */
4044 gfc_commit_symbol (param_sym);
4048 /* Add a procedure interface to the given symbol (i.e., store a
4049 reference to the list of formal arguments). */
4052 add_proc_interface (gfc_symbol *sym, ifsrc source,
4053 gfc_formal_arglist *formal)
4056 sym->formal = formal;
4057 sym->attr.if_source = source;
4061 /* Copy the formal args from an existing symbol, src, into a new
4062 symbol, dest. New formal args are created, and the description of
4063 each arg is set according to the existing ones. This function is
4064 used when creating procedure declaration variables from a procedure
4065 declaration statement (see match_proc_decl()) to create the formal
4066 args based on the args of a given named interface. */
4069 gfc_copy_formal_args (gfc_symbol *dest, gfc_symbol *src)
4071 gfc_formal_arglist *head = NULL;
4072 gfc_formal_arglist *tail = NULL;
4073 gfc_formal_arglist *formal_arg = NULL;
4074 gfc_formal_arglist *curr_arg = NULL;
4075 gfc_formal_arglist *formal_prev = NULL;
4076 /* Save current namespace so we can change it for formal args. */
4077 gfc_namespace *parent_ns = gfc_current_ns;
4079 /* Create a new namespace, which will be the formal ns (namespace
4080 of the formal args). */
4081 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4082 gfc_current_ns->proc_name = dest;
4084 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4086 formal_arg = gfc_get_formal_arglist ();
4087 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4089 /* May need to copy more info for the symbol. */
4090 formal_arg->sym->attr = curr_arg->sym->attr;
4091 formal_arg->sym->ts = curr_arg->sym->ts;
4092 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4093 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
4095 /* If this isn't the first arg, set up the next ptr. For the
4096 last arg built, the formal_arg->next will never get set to
4097 anything other than NULL. */
4098 if (formal_prev != NULL)
4099 formal_prev->next = formal_arg;
4101 formal_arg->next = NULL;
4103 formal_prev = formal_arg;
4105 /* Add arg to list of formal args. */
4106 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4108 /* Validate changes. */
4109 gfc_commit_symbol (formal_arg->sym);
4112 /* Add the interface to the symbol. */
4113 add_proc_interface (dest, IFSRC_DECL, head);
4115 /* Store the formal namespace information. */
4116 if (dest->formal != NULL)
4117 /* The current ns should be that for the dest proc. */
4118 dest->formal_ns = gfc_current_ns;
4119 /* Restore the current namespace to what it was on entry. */
4120 gfc_current_ns = parent_ns;
4125 gfc_copy_formal_args_intr (gfc_symbol *dest, gfc_intrinsic_sym *src)
4127 gfc_formal_arglist *head = NULL;
4128 gfc_formal_arglist *tail = NULL;
4129 gfc_formal_arglist *formal_arg = NULL;
4130 gfc_intrinsic_arg *curr_arg = NULL;
4131 gfc_formal_arglist *formal_prev = NULL;
4132 /* Save current namespace so we can change it for formal args. */
4133 gfc_namespace *parent_ns = gfc_current_ns;
4135 /* Create a new namespace, which will be the formal ns (namespace
4136 of the formal args). */
4137 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4138 gfc_current_ns->proc_name = dest;
4140 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4142 formal_arg = gfc_get_formal_arglist ();
4143 gfc_get_symbol (curr_arg->name, gfc_current_ns, &(formal_arg->sym));
4145 /* May need to copy more info for the symbol. */
4146 formal_arg->sym->ts = curr_arg->ts;
4147 formal_arg->sym->attr.optional = curr_arg->optional;
4148 formal_arg->sym->attr.value = curr_arg->value;
4149 formal_arg->sym->attr.intent = curr_arg->intent;
4150 formal_arg->sym->attr.flavor = FL_VARIABLE;
4151 formal_arg->sym->attr.dummy = 1;
4153 if (formal_arg->sym->ts.type == BT_CHARACTER)
4154 formal_arg->sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4156 /* If this isn't the first arg, set up the next ptr. For the
4157 last arg built, the formal_arg->next will never get set to
4158 anything other than NULL. */
4159 if (formal_prev != NULL)
4160 formal_prev->next = formal_arg;
4162 formal_arg->next = NULL;
4164 formal_prev = formal_arg;
4166 /* Add arg to list of formal args. */
4167 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4169 /* Validate changes. */
4170 gfc_commit_symbol (formal_arg->sym);
4173 /* Add the interface to the symbol. */
4174 add_proc_interface (dest, IFSRC_DECL, head);
4176 /* Store the formal namespace information. */
4177 if (dest->formal != NULL)
4178 /* The current ns should be that for the dest proc. */
4179 dest->formal_ns = gfc_current_ns;
4180 /* Restore the current namespace to what it was on entry. */
4181 gfc_current_ns = parent_ns;
4186 gfc_copy_formal_args_ppc (gfc_component *dest, gfc_symbol *src)
4188 gfc_formal_arglist *head = NULL;
4189 gfc_formal_arglist *tail = NULL;
4190 gfc_formal_arglist *formal_arg = NULL;
4191 gfc_formal_arglist *curr_arg = NULL;
4192 gfc_formal_arglist *formal_prev = NULL;
4193 /* Save current namespace so we can change it for formal args. */
4194 gfc_namespace *parent_ns = gfc_current_ns;
4196 /* Create a new namespace, which will be the formal ns (namespace
4197 of the formal args). */
4198 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4199 /* TODO: gfc_current_ns->proc_name = dest;*/
4201 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4203 formal_arg = gfc_get_formal_arglist ();
4204 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4206 /* May need to copy more info for the symbol. */
4207 formal_arg->sym->attr = curr_arg->sym->attr;
4208 formal_arg->sym->ts = curr_arg->sym->ts;
4209 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4210 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
4212 /* If this isn't the first arg, set up the next ptr. For the
4213 last arg built, the formal_arg->next will never get set to
4214 anything other than NULL. */
4215 if (formal_prev != NULL)
4216 formal_prev->next = formal_arg;
4218 formal_arg->next = NULL;
4220 formal_prev = formal_arg;
4222 /* Add arg to list of formal args. */
4223 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4225 /* Validate changes. */
4226 gfc_commit_symbol (formal_arg->sym);
4229 /* Add the interface to the symbol. */
4230 gfc_free_formal_arglist (dest->formal);
4231 dest->formal = head;
4232 dest->attr.if_source = IFSRC_DECL;
4234 /* Store the formal namespace information. */
4235 if (dest->formal != NULL)
4236 /* The current ns should be that for the dest proc. */
4237 dest->formal_ns = gfc_current_ns;
4238 /* Restore the current namespace to what it was on entry. */
4239 gfc_current_ns = parent_ns;
4243 /* Builds the parameter list for the iso_c_binding procedure
4244 c_f_pointer or c_f_procpointer. The old_sym typically refers to a
4245 generic version of either the c_f_pointer or c_f_procpointer
4246 functions. The new_proc_sym represents a "resolved" version of the
4247 symbol. The functions are resolved to match the types of their
4248 parameters; for example, c_f_pointer(cptr, fptr) would resolve to
4249 something similar to c_f_pointer_i4 if the type of data object fptr
4250 pointed to was a default integer. The actual name of the resolved
4251 procedure symbol is further mangled with the module name, etc., but
4252 the idea holds true. */
4255 build_formal_args (gfc_symbol *new_proc_sym,
4256 gfc_symbol *old_sym, int add_optional_arg)
4258 gfc_formal_arglist *head = NULL, *tail = NULL;
4259 gfc_namespace *parent_ns = NULL;
4261 parent_ns = gfc_current_ns;
4262 /* Create a new namespace, which will be the formal ns (namespace
4263 of the formal args). */
4264 gfc_current_ns = gfc_get_namespace(parent_ns, 0);
4265 gfc_current_ns->proc_name = new_proc_sym;
4267 /* Generate the params. */
4268 if (old_sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER)
4270 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4271 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4272 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4273 gfc_current_ns, "fptr", 1);
4275 else if (old_sym->intmod_sym_id == ISOCBINDING_F_POINTER)
4277 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4278 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4279 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4280 gfc_current_ns, "fptr", 0);
4281 /* If we're dealing with c_f_pointer, it has an optional third arg. */
4282 gen_shape_param (&head, &tail,(const char *) new_proc_sym->module,
4283 gfc_current_ns, "shape");
4286 else if (old_sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
4288 /* c_associated has one required arg and one optional; both
4290 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4291 gfc_current_ns, "c_ptr_1", ISOCBINDING_ASSOCIATED);
4292 if (add_optional_arg)
4294 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4295 gfc_current_ns, "c_ptr_2", ISOCBINDING_ASSOCIATED);
4296 /* The last param is optional so mark it as such. */
4297 tail->sym->attr.optional = 1;
4301 /* Add the interface (store formal args to new_proc_sym). */
4302 add_proc_interface (new_proc_sym, IFSRC_DECL, head);
4304 /* Set up the formal_ns pointer to the one created for the
4305 new procedure so it'll get cleaned up during gfc_free_symbol(). */
4306 new_proc_sym->formal_ns = gfc_current_ns;
4308 gfc_current_ns = parent_ns;
4312 std_for_isocbinding_symbol (int id)
4316 #define NAMED_INTCST(a,b,c,d) \
4319 #include "iso-c-binding.def"
4322 #define NAMED_FUNCTION(a,b,c,d) \
4325 #include "iso-c-binding.def"
4326 #undef NAMED_FUNCTION
4329 return GFC_STD_F2003;
4333 /* Generate the given set of C interoperable kind objects, or all
4334 interoperable kinds. This function will only be given kind objects
4335 for valid iso_c_binding defined types because this is verified when
4336 the 'use' statement is parsed. If the user gives an 'only' clause,
4337 the specific kinds are looked up; if they don't exist, an error is
4338 reported. If the user does not give an 'only' clause, all
4339 iso_c_binding symbols are generated. If a list of specific kinds
4340 is given, it must have a NULL in the first empty spot to mark the
4345 generate_isocbinding_symbol (const char *mod_name, iso_c_binding_symbol s,
4346 const char *local_name)
4348 const char *const name = (local_name && local_name[0]) ? local_name
4349 : c_interop_kinds_table[s].name;
4350 gfc_symtree *tmp_symtree = NULL;
4351 gfc_symbol *tmp_sym = NULL;
4354 if (gfc_notification_std (std_for_isocbinding_symbol (s)) == ERROR)
4357 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, name);
4359 /* Already exists in this scope so don't re-add it. */
4360 if (tmp_symtree != NULL && (tmp_sym = tmp_symtree->n.sym) != NULL
4361 && (!tmp_sym->attr.generic
4362 || (tmp_sym = gfc_find_dt_in_generic (tmp_sym)) != NULL)
4363 && tmp_sym->from_intmod == INTMOD_ISO_C_BINDING)
4365 if (tmp_sym->attr.flavor == FL_DERIVED
4366 && !get_iso_c_binding_dt (tmp_sym->intmod_sym_id))
4368 gfc_dt_list *dt_list;
4369 dt_list = gfc_get_dt_list ();
4370 dt_list->derived = tmp_sym;
4371 dt_list->next = gfc_derived_types;
4372 gfc_derived_types = dt_list;
4378 /* Create the sym tree in the current ns. */
4379 gfc_get_sym_tree (name, gfc_current_ns, &tmp_symtree, false);
4381 tmp_sym = tmp_symtree->n.sym;
4383 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4386 /* Say what module this symbol belongs to. */
4387 tmp_sym->module = gfc_get_string (mod_name);
4388 tmp_sym->from_intmod = INTMOD_ISO_C_BINDING;
4389 tmp_sym->intmod_sym_id = s;
4394 #define NAMED_INTCST(a,b,c,d) case a :
4395 #define NAMED_REALCST(a,b,c,d) case a :
4396 #define NAMED_CMPXCST(a,b,c,d) case a :
4397 #define NAMED_LOGCST(a,b,c) case a :
4398 #define NAMED_CHARKNDCST(a,b,c) case a :
4399 #include "iso-c-binding.def"
4401 tmp_sym->value = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4402 c_interop_kinds_table[s].value);
4404 /* Initialize an integer constant expression node. */
4405 tmp_sym->attr.flavor = FL_PARAMETER;
4406 tmp_sym->ts.type = BT_INTEGER;
4407 tmp_sym->ts.kind = gfc_default_integer_kind;
4409 /* Mark this type as a C interoperable one. */
4410 tmp_sym->ts.is_c_interop = 1;
4411 tmp_sym->ts.is_iso_c = 1;
4412 tmp_sym->value->ts.is_c_interop = 1;
4413 tmp_sym->value->ts.is_iso_c = 1;
4414 tmp_sym->attr.is_c_interop = 1;
4416 /* Tell what f90 type this c interop kind is valid. */
4417 tmp_sym->ts.f90_type = c_interop_kinds_table[s].f90_type;
4419 /* Say it's from the iso_c_binding module. */
4420 tmp_sym->attr.is_iso_c = 1;
4422 /* Make it use associated. */
4423 tmp_sym->attr.use_assoc = 1;
4427 #define NAMED_CHARCST(a,b,c) case a :
4428 #include "iso-c-binding.def"
4430 /* Initialize an integer constant expression node for the
4431 length of the character. */
4432 tmp_sym->value = gfc_get_character_expr (gfc_default_character_kind,
4433 &gfc_current_locus, NULL, 1);
4434 tmp_sym->value->ts.is_c_interop = 1;
4435 tmp_sym->value->ts.is_iso_c = 1;
4436 tmp_sym->value->value.character.length = 1;
4437 tmp_sym->value->value.character.string[0]
4438 = (gfc_char_t) c_interop_kinds_table[s].value;
4439 tmp_sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4440 tmp_sym->ts.u.cl->length = gfc_get_int_expr (gfc_default_integer_kind,
4443 /* May not need this in both attr and ts, but do need in
4444 attr for writing module file. */
4445 tmp_sym->attr.is_c_interop = 1;
4447 tmp_sym->attr.flavor = FL_PARAMETER;
4448 tmp_sym->ts.type = BT_CHARACTER;
4450 /* Need to set it to the C_CHAR kind. */
4451 tmp_sym->ts.kind = gfc_default_character_kind;
4453 /* Mark this type as a C interoperable one. */
4454 tmp_sym->ts.is_c_interop = 1;
4455 tmp_sym->ts.is_iso_c = 1;
4457 /* Tell what f90 type this c interop kind is valid. */
4458 tmp_sym->ts.f90_type = BT_CHARACTER;
4460 /* Say it's from the iso_c_binding module. */
4461 tmp_sym->attr.is_iso_c = 1;
4463 /* Make it use associated. */
4464 tmp_sym->attr.use_assoc = 1;
4467 case ISOCBINDING_PTR:
4468 case ISOCBINDING_FUNPTR:
4470 gfc_interface *intr, *head;
4472 const char *hidden_name;
4473 gfc_dt_list **dt_list_ptr = NULL;
4474 gfc_component *tmp_comp = NULL;
4475 char comp_name[(GFC_MAX_SYMBOL_LEN * 2) + 1];
4477 hidden_name = gfc_get_string ("%c%s",
4478 (char) TOUPPER ((unsigned char) tmp_sym->name[0]),
4481 /* Generate real derived type. */
4482 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
4485 if (tmp_symtree != NULL)
4487 gfc_get_sym_tree (hidden_name, gfc_current_ns, &tmp_symtree, false);
4489 dt_sym = tmp_symtree->n.sym;
4493 /* Generate an artificial generic function. */
4494 dt_sym->name = gfc_get_string (tmp_sym->name);
4495 head = tmp_sym->generic;
4496 intr = gfc_get_interface ();
4498 intr->where = gfc_current_locus;
4500 tmp_sym->generic = intr;
4502 if (!tmp_sym->attr.generic
4503 && gfc_add_generic (&tmp_sym->attr, tmp_sym->name, NULL)
4507 if (!tmp_sym->attr.function
4508 && gfc_add_function (&tmp_sym->attr, tmp_sym->name, NULL)
4512 /* Say what module this symbol belongs to. */
4513 dt_sym->module = gfc_get_string (mod_name);
4514 dt_sym->from_intmod = INTMOD_ISO_C_BINDING;
4515 dt_sym->intmod_sym_id = s;
4517 /* Initialize an integer constant expression node. */
4518 dt_sym->attr.flavor = FL_DERIVED;
4519 dt_sym->ts.is_c_interop = 1;
4520 dt_sym->attr.is_c_interop = 1;
4521 dt_sym->attr.is_iso_c = 1;
4522 dt_sym->ts.is_iso_c = 1;
4523 dt_sym->ts.type = BT_DERIVED;
4525 /* A derived type must have the bind attribute to be
4526 interoperable (J3/04-007, Section 15.2.3), even though
4527 the binding label is not used. */
4528 dt_sym->attr.is_bind_c = 1;
4530 dt_sym->attr.referenced = 1;
4531 dt_sym->ts.u.derived = dt_sym;
4533 /* Add the symbol created for the derived type to the current ns. */
4534 dt_list_ptr = &(gfc_derived_types);
4535 while (*dt_list_ptr != NULL && (*dt_list_ptr)->next != NULL)
4536 dt_list_ptr = &((*dt_list_ptr)->next);
4538 /* There is already at least one derived type in the list, so append
4539 the one we're currently building for c_ptr or c_funptr. */
4540 if (*dt_list_ptr != NULL)
4541 dt_list_ptr = &((*dt_list_ptr)->next);
4542 (*dt_list_ptr) = gfc_get_dt_list ();
4543 (*dt_list_ptr)->derived = dt_sym;
4544 (*dt_list_ptr)->next = NULL;
4546 /* Set up the component of the derived type, which will be
4547 an integer with kind equal to c_ptr_size. Mangle the name of
4548 the field for the c_address to prevent the curious user from
4549 trying to access it from Fortran. */
4550 sprintf (comp_name, "__%s_%s", dt_sym->name, "c_address");
4551 gfc_add_component (dt_sym, comp_name, &tmp_comp);
4552 if (tmp_comp == NULL)
4553 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4554 "create component for c_address");
4556 tmp_comp->ts.type = BT_INTEGER;
4558 /* Set this because the module will need to read/write this field. */
4559 tmp_comp->ts.f90_type = BT_INTEGER;
4561 /* The kinds for c_ptr and c_funptr are the same. */
4562 index = get_c_kind ("c_ptr", c_interop_kinds_table);
4563 tmp_comp->ts.kind = c_interop_kinds_table[index].value;
4565 tmp_comp->attr.pointer = 0;
4566 tmp_comp->attr.dimension = 0;
4568 /* Mark the component as C interoperable. */
4569 tmp_comp->ts.is_c_interop = 1;
4571 /* Make it use associated (iso_c_binding module). */
4572 dt_sym->attr.use_assoc = 1;
4577 case ISOCBINDING_NULL_PTR:
4578 case ISOCBINDING_NULL_FUNPTR:
4579 gen_special_c_interop_ptr (s, name, mod_name);
4582 case ISOCBINDING_F_POINTER:
4583 case ISOCBINDING_ASSOCIATED:
4584 case ISOCBINDING_LOC:
4585 case ISOCBINDING_FUNLOC:
4586 case ISOCBINDING_F_PROCPOINTER:
4588 tmp_sym->attr.proc = PROC_MODULE;
4590 /* Use the procedure's name as it is in the iso_c_binding module for
4591 setting the binding label in case the user renamed the symbol. */
4592 tmp_sym->binding_label =
4593 gfc_get_string ("%s_%s", mod_name,
4594 c_interop_kinds_table[s].name);
4595 tmp_sym->attr.is_iso_c = 1;
4596 if (s == ISOCBINDING_F_POINTER || s == ISOCBINDING_F_PROCPOINTER)
4597 tmp_sym->attr.subroutine = 1;
4600 /* TODO! This needs to be finished more for the expr of the
4601 function or something!
4602 This may not need to be here, because trying to do c_loc
4604 if (s == ISOCBINDING_ASSOCIATED)
4606 tmp_sym->attr.function = 1;
4607 tmp_sym->ts.type = BT_LOGICAL;
4608 tmp_sym->ts.kind = gfc_default_logical_kind;
4609 tmp_sym->result = tmp_sym;
4613 /* Here, we're taking the simple approach. We're defining
4614 c_loc as an external identifier so the compiler will put
4615 what we expect on the stack for the address we want the
4617 tmp_sym->ts.type = BT_DERIVED;
4618 if (s == ISOCBINDING_LOC)
4619 tmp_sym->ts.u.derived =
4620 get_iso_c_binding_dt (ISOCBINDING_PTR);
4622 tmp_sym->ts.u.derived =
4623 get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
4625 if (tmp_sym->ts.u.derived == NULL)
4627 /* Create the necessary derived type so we can continue
4628 processing the file. */
4629 generate_isocbinding_symbol
4630 (mod_name, s == ISOCBINDING_FUNLOC
4631 ? ISOCBINDING_FUNPTR : ISOCBINDING_PTR,
4632 (const char *)(s == ISOCBINDING_FUNLOC
4633 ? "c_funptr" : "c_ptr"));
4634 tmp_sym->ts.u.derived =
4635 get_iso_c_binding_dt (s == ISOCBINDING_FUNLOC
4636 ? ISOCBINDING_FUNPTR
4640 /* The function result is itself (no result clause). */
4641 tmp_sym->result = tmp_sym;
4642 tmp_sym->attr.external = 1;
4643 tmp_sym->attr.use_assoc = 0;
4644 tmp_sym->attr.pure = 1;
4645 tmp_sym->attr.if_source = IFSRC_UNKNOWN;
4646 tmp_sym->attr.proc = PROC_UNKNOWN;
4650 tmp_sym->attr.flavor = FL_PROCEDURE;
4651 tmp_sym->attr.contained = 0;
4653 /* Try using this builder routine, with the new and old symbols
4654 both being the generic iso_c proc sym being created. This
4655 will create the formal args (and the new namespace for them).
4656 Don't build an arg list for c_loc because we're going to treat
4657 c_loc as an external procedure. */
4658 if (s != ISOCBINDING_LOC && s != ISOCBINDING_FUNLOC)
4659 /* The 1 says to add any optional args, if applicable. */
4660 build_formal_args (tmp_sym, tmp_sym, 1);
4662 /* Set this after setting up the symbol, to prevent error messages. */
4663 tmp_sym->attr.use_assoc = 1;
4665 /* This symbol will not be referenced directly. It will be
4666 resolved to the implementation for the given f90 kind. */
4667 tmp_sym->attr.referenced = 0;
4674 gfc_commit_symbol (tmp_sym);
4678 /* Creates a new symbol based off of an old iso_c symbol, with a new
4679 binding label. This function can be used to create a new,
4680 resolved, version of a procedure symbol for c_f_pointer or
4681 c_f_procpointer that is based on the generic symbols. A new
4682 parameter list is created for the new symbol using
4683 build_formal_args(). The add_optional_flag specifies whether the
4684 to add the optional SHAPE argument. The new symbol is
4688 get_iso_c_sym (gfc_symbol *old_sym, char *new_name,
4689 const char *new_binding_label, int add_optional_arg)
4691 gfc_symtree *new_symtree = NULL;
4693 /* See if we have a symbol by that name already available, looking
4694 through any parent namespaces. */
4695 gfc_find_sym_tree (new_name, gfc_current_ns, 1, &new_symtree);
4696 if (new_symtree != NULL)
4697 /* Return the existing symbol. */
4698 return new_symtree->n.sym;
4700 /* Create the symtree/symbol, with attempted host association. */
4701 gfc_get_ha_sym_tree (new_name, &new_symtree);
4702 if (new_symtree == NULL)
4703 gfc_internal_error ("get_iso_c_sym(): Unable to create "
4704 "symtree for '%s'", new_name);
4706 /* Now fill in the fields of the resolved symbol with the old sym. */
4707 new_symtree->n.sym->binding_label = new_binding_label;
4708 new_symtree->n.sym->attr = old_sym->attr;
4709 new_symtree->n.sym->ts = old_sym->ts;
4710 new_symtree->n.sym->module = gfc_get_string (old_sym->module);
4711 new_symtree->n.sym->from_intmod = old_sym->from_intmod;
4712 new_symtree->n.sym->intmod_sym_id = old_sym->intmod_sym_id;
4713 if (old_sym->attr.function)
4714 new_symtree->n.sym->result = new_symtree->n.sym;
4715 /* Build the formal arg list. */
4716 build_formal_args (new_symtree->n.sym, old_sym, add_optional_arg);
4718 gfc_commit_symbol (new_symtree->n.sym);
4720 return new_symtree->n.sym;
4724 /* Check that a symbol is already typed. If strict is not set, an untyped
4725 symbol is acceptable for non-standard-conforming mode. */
4728 gfc_check_symbol_typed (gfc_symbol* sym, gfc_namespace* ns,
4729 bool strict, locus where)
4733 if (gfc_matching_prefix)
4736 /* Check for the type and try to give it an implicit one. */
4737 if (sym->ts.type == BT_UNKNOWN
4738 && gfc_set_default_type (sym, 0, ns) == FAILURE)
4742 gfc_error ("Symbol '%s' is used before it is typed at %L",
4747 if (gfc_notify_std (GFC_STD_GNU,
4748 "Extension: Symbol '%s' is used before"
4749 " it is typed at %L", sym->name, &where) == FAILURE)
4753 /* Everything is ok. */
4758 /* Construct a typebound-procedure structure. Those are stored in a tentative
4759 list and marked `error' until symbols are committed. */
4762 gfc_get_typebound_proc (gfc_typebound_proc *tb0)
4764 gfc_typebound_proc *result;
4765 tentative_tbp *list_node;
4767 result = XCNEW (gfc_typebound_proc);
4772 list_node = XCNEW (tentative_tbp);
4773 list_node->next = tentative_tbp_list;
4774 list_node->proc = result;
4775 tentative_tbp_list = list_node;
4781 /* Get the super-type of a given derived type. */
4784 gfc_get_derived_super_type (gfc_symbol* derived)
4786 if (derived && derived->attr.generic)
4787 derived = gfc_find_dt_in_generic (derived);
4789 if (!derived->attr.extension)
4792 gcc_assert (derived->components);
4793 gcc_assert (derived->components->ts.type == BT_DERIVED);
4794 gcc_assert (derived->components->ts.u.derived);
4796 if (derived->components->ts.u.derived->attr.generic)
4797 return gfc_find_dt_in_generic (derived->components->ts.u.derived);
4799 return derived->components->ts.u.derived;
4803 /* Get the ultimate super-type of a given derived type. */
4806 gfc_get_ultimate_derived_super_type (gfc_symbol* derived)
4808 if (!derived->attr.extension)
4811 derived = gfc_get_derived_super_type (derived);
4813 if (derived->attr.extension)
4814 return gfc_get_ultimate_derived_super_type (derived);
4820 /* Check if a derived type t2 is an extension of (or equal to) a type t1. */
4823 gfc_type_is_extension_of (gfc_symbol *t1, gfc_symbol *t2)
4825 while (!gfc_compare_derived_types (t1, t2) && t2->attr.extension)
4826 t2 = gfc_get_derived_super_type (t2);
4827 return gfc_compare_derived_types (t1, t2);
4831 /* Check if two typespecs are type compatible (F03:5.1.1.2):
4832 If ts1 is nonpolymorphic, ts2 must be the same type.
4833 If ts1 is polymorphic (CLASS), ts2 must be an extension of ts1. */
4836 gfc_type_compatible (gfc_typespec *ts1, gfc_typespec *ts2)
4838 bool is_class1 = (ts1->type == BT_CLASS);
4839 bool is_class2 = (ts2->type == BT_CLASS);
4840 bool is_derived1 = (ts1->type == BT_DERIVED);
4841 bool is_derived2 = (ts2->type == BT_DERIVED);
4843 if (!is_derived1 && !is_derived2 && !is_class1 && !is_class2)
4844 return (ts1->type == ts2->type);
4846 if (is_derived1 && is_derived2)
4847 return gfc_compare_derived_types (ts1->u.derived, ts2->u.derived);
4849 if (is_class1 && is_derived2)
4850 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4852 else if (is_class1 && is_class2)
4853 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4854 ts2->u.derived->components->ts.u.derived);
4860 /* Find the parent-namespace of the current function. If we're inside
4861 BLOCK constructs, it may not be the current one. */
4864 gfc_find_proc_namespace (gfc_namespace* ns)
4866 while (ns->construct_entities)
4876 /* Check if an associate-variable should be translated as an `implicit' pointer
4877 internally (if it is associated to a variable and not an array with
4881 gfc_is_associate_pointer (gfc_symbol* sym)
4886 if (sym->ts.type == BT_CLASS)
4889 if (!sym->assoc->variable)
4892 if (sym->attr.dimension && sym->as->type != AS_EXPLICIT)
4900 gfc_find_dt_in_generic (gfc_symbol *sym)
4902 gfc_interface *intr = NULL;
4904 if (!sym || sym->attr.flavor == FL_DERIVED)
4907 if (sym->attr.generic)
4908 for (intr = (sym ? sym->generic : NULL); intr; intr = intr->next)
4909 if (intr->sym->attr.flavor == FL_DERIVED)
4911 return intr ? intr->sym : NULL;