1 /* Maintain binary trees of symbols.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
30 #include "constructor.h"
33 /* Strings for all symbol attributes. We use these for dumping the
34 parse tree, in error messages, and also when reading and writing
37 const mstring flavors[] =
39 minit ("UNKNOWN-FL", FL_UNKNOWN), minit ("PROGRAM", FL_PROGRAM),
40 minit ("BLOCK-DATA", FL_BLOCK_DATA), minit ("MODULE", FL_MODULE),
41 minit ("VARIABLE", FL_VARIABLE), minit ("PARAMETER", FL_PARAMETER),
42 minit ("LABEL", FL_LABEL), minit ("PROCEDURE", FL_PROCEDURE),
43 minit ("DERIVED", FL_DERIVED), minit ("NAMELIST", FL_NAMELIST),
47 const mstring procedures[] =
49 minit ("UNKNOWN-PROC", PROC_UNKNOWN),
50 minit ("MODULE-PROC", PROC_MODULE),
51 minit ("INTERNAL-PROC", PROC_INTERNAL),
52 minit ("DUMMY-PROC", PROC_DUMMY),
53 minit ("INTRINSIC-PROC", PROC_INTRINSIC),
54 minit ("EXTERNAL-PROC", PROC_EXTERNAL),
55 minit ("STATEMENT-PROC", PROC_ST_FUNCTION),
59 const mstring intents[] =
61 minit ("UNKNOWN-INTENT", INTENT_UNKNOWN),
62 minit ("IN", INTENT_IN),
63 minit ("OUT", INTENT_OUT),
64 minit ("INOUT", INTENT_INOUT),
68 const mstring access_types[] =
70 minit ("UNKNOWN-ACCESS", ACCESS_UNKNOWN),
71 minit ("PUBLIC", ACCESS_PUBLIC),
72 minit ("PRIVATE", ACCESS_PRIVATE),
76 const mstring ifsrc_types[] =
78 minit ("UNKNOWN", IFSRC_UNKNOWN),
79 minit ("DECL", IFSRC_DECL),
80 minit ("BODY", IFSRC_IFBODY)
83 const mstring save_status[] =
85 minit ("UNKNOWN", SAVE_NONE),
86 minit ("EXPLICIT-SAVE", SAVE_EXPLICIT),
87 minit ("IMPLICIT-SAVE", SAVE_IMPLICIT),
90 /* This is to make sure the backend generates setup code in the correct
93 static int next_dummy_order = 1;
96 gfc_namespace *gfc_current_ns;
97 gfc_namespace *gfc_global_ns_list;
99 gfc_gsymbol *gfc_gsym_root = NULL;
101 static gfc_symbol *changed_syms = NULL;
103 gfc_dt_list *gfc_derived_types;
106 /* List of tentative typebound-procedures. */
108 typedef struct tentative_tbp
110 gfc_typebound_proc *proc;
111 struct tentative_tbp *next;
115 static tentative_tbp *tentative_tbp_list = NULL;
118 /*********** IMPLICIT NONE and IMPLICIT statement handlers ***********/
120 /* The following static variable indicates whether a particular element has
121 been explicitly set or not. */
123 static int new_flag[GFC_LETTERS];
126 /* Handle a correctly parsed IMPLICIT NONE. */
129 gfc_set_implicit_none (void)
133 if (gfc_current_ns->seen_implicit_none)
135 gfc_error ("Duplicate IMPLICIT NONE statement at %C");
139 gfc_current_ns->seen_implicit_none = 1;
141 for (i = 0; i < GFC_LETTERS; i++)
143 gfc_clear_ts (&gfc_current_ns->default_type[i]);
144 gfc_current_ns->set_flag[i] = 1;
149 /* Reset the implicit range flags. */
152 gfc_clear_new_implicit (void)
156 for (i = 0; i < GFC_LETTERS; i++)
161 /* Prepare for a new implicit range. Sets flags in new_flag[]. */
164 gfc_add_new_implicit_range (int c1, int c2)
171 for (i = c1; i <= c2; i++)
175 gfc_error ("Letter '%c' already set in IMPLICIT statement at %C",
187 /* Add a matched implicit range for gfc_set_implicit(). Check if merging
188 the new implicit types back into the existing types will work. */
191 gfc_merge_new_implicit (gfc_typespec *ts)
195 if (gfc_current_ns->seen_implicit_none)
197 gfc_error ("Cannot specify IMPLICIT at %C after IMPLICIT NONE");
201 for (i = 0; i < GFC_LETTERS; i++)
205 if (gfc_current_ns->set_flag[i])
207 gfc_error ("Letter %c already has an IMPLICIT type at %C",
212 gfc_current_ns->default_type[i] = *ts;
213 gfc_current_ns->implicit_loc[i] = gfc_current_locus;
214 gfc_current_ns->set_flag[i] = 1;
221 /* Given a symbol, return a pointer to the typespec for its default type. */
224 gfc_get_default_type (const char *name, gfc_namespace *ns)
230 if (gfc_option.flag_allow_leading_underscore && letter == '_')
231 gfc_internal_error ("Option -fallow-leading-underscore is for use only by "
232 "gfortran developers, and should not be used for "
233 "implicitly typed variables");
235 if (letter < 'a' || letter > 'z')
236 gfc_internal_error ("gfc_get_default_type(): Bad symbol '%s'", name);
241 return &ns->default_type[letter - 'a'];
245 /* Given a pointer to a symbol, set its type according to the first
246 letter of its name. Fails if the letter in question has no default
250 gfc_set_default_type (gfc_symbol *sym, int error_flag, gfc_namespace *ns)
254 if (sym->ts.type != BT_UNKNOWN)
255 gfc_internal_error ("gfc_set_default_type(): symbol already has a type");
257 ts = gfc_get_default_type (sym->name, ns);
259 if (ts->type == BT_UNKNOWN)
261 if (error_flag && !sym->attr.untyped)
263 gfc_error ("Symbol '%s' at %L has no IMPLICIT type",
264 sym->name, &sym->declared_at);
265 sym->attr.untyped = 1; /* Ensure we only give an error once. */
272 sym->attr.implicit_type = 1;
274 if (ts->type == BT_CHARACTER && ts->u.cl)
275 sym->ts.u.cl = gfc_new_charlen (sym->ns, ts->u.cl);
277 if (sym->attr.is_bind_c == 1)
279 /* BIND(C) variables should not be implicitly declared. */
280 gfc_warning_now ("Implicitly declared BIND(C) variable '%s' at %L may "
281 "not be C interoperable", sym->name, &sym->declared_at);
282 sym->ts.f90_type = sym->ts.type;
285 if (sym->attr.dummy != 0)
287 if (sym->ns->proc_name != NULL
288 && (sym->ns->proc_name->attr.subroutine != 0
289 || sym->ns->proc_name->attr.function != 0)
290 && sym->ns->proc_name->attr.is_bind_c != 0)
292 /* Dummy args to a BIND(C) routine may not be interoperable if
293 they are implicitly typed. */
294 gfc_warning_now ("Implicitly declared variable '%s' at %L may not "
295 "be C interoperable but it is a dummy argument to "
296 "the BIND(C) procedure '%s' at %L", sym->name,
297 &(sym->declared_at), sym->ns->proc_name->name,
298 &(sym->ns->proc_name->declared_at));
299 sym->ts.f90_type = sym->ts.type;
307 /* This function is called from parse.c(parse_progunit) to check the
308 type of the function is not implicitly typed in the host namespace
309 and to implicitly type the function result, if necessary. */
312 gfc_check_function_type (gfc_namespace *ns)
314 gfc_symbol *proc = ns->proc_name;
316 if (!proc->attr.contained || proc->result->attr.implicit_type)
319 if (proc->result->ts.type == BT_UNKNOWN && proc->result->ts.interface == NULL)
321 if (gfc_set_default_type (proc->result, 0, gfc_current_ns)
324 if (proc->result != proc)
326 proc->ts = proc->result->ts;
327 proc->as = gfc_copy_array_spec (proc->result->as);
328 proc->attr.dimension = proc->result->attr.dimension;
329 proc->attr.pointer = proc->result->attr.pointer;
330 proc->attr.allocatable = proc->result->attr.allocatable;
333 else if (!proc->result->attr.proc_pointer)
335 gfc_error ("Function result '%s' at %L has no IMPLICIT type",
336 proc->result->name, &proc->result->declared_at);
337 proc->result->attr.untyped = 1;
343 /******************** Symbol attribute stuff *********************/
345 /* This is a generic conflict-checker. We do this to avoid having a
346 single conflict in two places. */
348 #define conf(a, b) if (attr->a && attr->b) { a1 = a; a2 = b; goto conflict; }
349 #define conf2(a) if (attr->a) { a2 = a; goto conflict; }
350 #define conf_std(a, b, std) if (attr->a && attr->b)\
359 check_conflict (symbol_attribute *attr, const char *name, locus *where)
361 static const char *dummy = "DUMMY", *save = "SAVE", *pointer = "POINTER",
362 *target = "TARGET", *external = "EXTERNAL", *intent = "INTENT",
363 *intent_in = "INTENT(IN)", *intrinsic = "INTRINSIC",
364 *intent_out = "INTENT(OUT)", *intent_inout = "INTENT(INOUT)",
365 *allocatable = "ALLOCATABLE", *elemental = "ELEMENTAL",
366 *privat = "PRIVATE", *recursive = "RECURSIVE",
367 *in_common = "COMMON", *result = "RESULT", *in_namelist = "NAMELIST",
368 *publik = "PUBLIC", *optional = "OPTIONAL", *entry = "ENTRY",
369 *function = "FUNCTION", *subroutine = "SUBROUTINE",
370 *dimension = "DIMENSION", *in_equivalence = "EQUIVALENCE",
371 *use_assoc = "USE ASSOCIATED", *cray_pointer = "CRAY POINTER",
372 *cray_pointee = "CRAY POINTEE", *data = "DATA", *value = "VALUE",
373 *volatile_ = "VOLATILE", *is_protected = "PROTECTED",
374 *is_bind_c = "BIND(C)", *procedure = "PROCEDURE",
375 *asynchronous = "ASYNCHRONOUS", *codimension = "CODIMENSION",
376 *contiguous = "CONTIGUOUS", *generic = "GENERIC";
377 static const char *threadprivate = "THREADPRIVATE";
383 where = &gfc_current_locus;
385 if (attr->pointer && attr->intent != INTENT_UNKNOWN)
389 standard = GFC_STD_F2003;
393 if (attr->in_namelist && (attr->allocatable || attr->pointer))
396 a2 = attr->allocatable ? allocatable : pointer;
397 standard = GFC_STD_F2003;
401 /* Check for attributes not allowed in a BLOCK DATA. */
402 if (gfc_current_state () == COMP_BLOCK_DATA)
406 if (attr->in_namelist)
408 if (attr->allocatable)
414 if (attr->access == ACCESS_PRIVATE)
416 if (attr->access == ACCESS_PUBLIC)
418 if (attr->intent != INTENT_UNKNOWN)
424 ("%s attribute not allowed in BLOCK DATA program unit at %L",
430 if (attr->save == SAVE_EXPLICIT)
433 conf (in_common, save);
436 switch (attr->flavor)
444 a1 = gfc_code2string (flavors, attr->flavor);
449 /* Conflicts between SAVE and PROCEDURE will be checked at
450 resolution stage, see "resolve_fl_procedure". */
459 conf (dummy, intrinsic);
460 conf (dummy, threadprivate);
461 conf (pointer, target);
462 conf (pointer, intrinsic);
463 conf (pointer, elemental);
464 conf (allocatable, elemental);
466 conf (target, external);
467 conf (target, intrinsic);
469 if (!attr->if_source)
470 conf (external, dimension); /* See Fortran 95's R504. */
472 conf (external, intrinsic);
473 conf (entry, intrinsic);
475 if ((attr->if_source == IFSRC_DECL && !attr->procedure) || attr->contained)
476 conf (external, subroutine);
478 if (attr->proc_pointer && gfc_notify_std (GFC_STD_F2003,
479 "Fortran 2003: Procedure pointer at %C") == FAILURE)
482 conf (allocatable, pointer);
483 conf_std (allocatable, dummy, GFC_STD_F2003);
484 conf_std (allocatable, function, GFC_STD_F2003);
485 conf_std (allocatable, result, GFC_STD_F2003);
486 conf (elemental, recursive);
488 conf (in_common, dummy);
489 conf (in_common, allocatable);
490 conf (in_common, codimension);
491 conf (in_common, result);
493 conf (in_equivalence, use_assoc);
494 conf (in_equivalence, codimension);
495 conf (in_equivalence, dummy);
496 conf (in_equivalence, target);
497 conf (in_equivalence, pointer);
498 conf (in_equivalence, function);
499 conf (in_equivalence, result);
500 conf (in_equivalence, entry);
501 conf (in_equivalence, allocatable);
502 conf (in_equivalence, threadprivate);
504 conf (dummy, result);
505 conf (entry, result);
506 conf (generic, result);
508 conf (function, subroutine);
510 if (!function && !subroutine)
511 conf (is_bind_c, dummy);
513 conf (is_bind_c, cray_pointer);
514 conf (is_bind_c, cray_pointee);
515 conf (is_bind_c, codimension);
516 conf (is_bind_c, allocatable);
517 conf (is_bind_c, elemental);
519 /* Need to also get volatile attr, according to 5.1 of F2003 draft.
520 Parameter conflict caught below. Also, value cannot be specified
521 for a dummy procedure. */
523 /* Cray pointer/pointee conflicts. */
524 conf (cray_pointer, cray_pointee);
525 conf (cray_pointer, dimension);
526 conf (cray_pointer, codimension);
527 conf (cray_pointer, contiguous);
528 conf (cray_pointer, pointer);
529 conf (cray_pointer, target);
530 conf (cray_pointer, allocatable);
531 conf (cray_pointer, external);
532 conf (cray_pointer, intrinsic);
533 conf (cray_pointer, in_namelist);
534 conf (cray_pointer, function);
535 conf (cray_pointer, subroutine);
536 conf (cray_pointer, entry);
538 conf (cray_pointee, allocatable);
539 conf (cray_pointer, contiguous);
540 conf (cray_pointer, codimension);
541 conf (cray_pointee, intent);
542 conf (cray_pointee, optional);
543 conf (cray_pointee, dummy);
544 conf (cray_pointee, target);
545 conf (cray_pointee, intrinsic);
546 conf (cray_pointee, pointer);
547 conf (cray_pointee, entry);
548 conf (cray_pointee, in_common);
549 conf (cray_pointee, in_equivalence);
550 conf (cray_pointee, threadprivate);
553 conf (data, function);
555 conf (data, allocatable);
557 conf (value, pointer)
558 conf (value, allocatable)
559 conf (value, subroutine)
560 conf (value, function)
561 conf (value, volatile_)
562 conf (value, dimension)
563 conf (value, codimension)
564 conf (value, external)
566 conf (codimension, result)
569 && (attr->intent == INTENT_OUT || attr->intent == INTENT_INOUT))
572 a2 = attr->intent == INTENT_OUT ? intent_out : intent_inout;
576 conf (is_protected, intrinsic)
577 conf (is_protected, in_common)
579 conf (asynchronous, intrinsic)
580 conf (asynchronous, external)
582 conf (volatile_, intrinsic)
583 conf (volatile_, external)
585 if (attr->volatile_ && attr->intent == INTENT_IN)
592 conf (procedure, allocatable)
593 conf (procedure, dimension)
594 conf (procedure, codimension)
595 conf (procedure, intrinsic)
596 conf (procedure, target)
597 conf (procedure, value)
598 conf (procedure, volatile_)
599 conf (procedure, asynchronous)
600 conf (procedure, entry)
602 a1 = gfc_code2string (flavors, attr->flavor);
604 if (attr->in_namelist
605 && attr->flavor != FL_VARIABLE
606 && attr->flavor != FL_PROCEDURE
607 && attr->flavor != FL_UNKNOWN)
613 switch (attr->flavor)
623 conf2 (asynchronous);
626 conf2 (is_protected);
636 conf2 (threadprivate);
638 if (attr->access == ACCESS_PUBLIC || attr->access == ACCESS_PRIVATE)
640 a2 = attr->access == ACCESS_PUBLIC ? publik : privat;
641 gfc_error ("%s attribute applied to %s %s at %L", a2, a1,
648 gfc_error_now ("BIND(C) applied to %s %s at %L", a1, name, where);
662 /* Conflicts with INTENT, SAVE and RESULT will be checked
663 at resolution stage, see "resolve_fl_procedure". */
665 if (attr->subroutine)
671 conf2 (asynchronous);
676 if (!attr->proc_pointer)
677 conf2 (threadprivate);
680 if (!attr->proc_pointer)
685 case PROC_ST_FUNCTION:
696 conf2 (threadprivate);
716 conf2 (threadprivate);
719 if (attr->intent != INTENT_UNKNOWN)
736 conf2 (is_protected);
742 conf2 (asynchronous);
743 conf2 (threadprivate);
758 gfc_error ("%s attribute conflicts with %s attribute at %L",
761 gfc_error ("%s attribute conflicts with %s attribute in '%s' at %L",
762 a1, a2, name, where);
769 return gfc_notify_std (standard, "Fortran 2003: %s attribute "
770 "with %s attribute at %L", a1, a2,
775 return gfc_notify_std (standard, "Fortran 2003: %s attribute "
776 "with %s attribute in '%s' at %L",
777 a1, a2, name, where);
786 /* Mark a symbol as referenced. */
789 gfc_set_sym_referenced (gfc_symbol *sym)
792 if (sym->attr.referenced)
795 sym->attr.referenced = 1;
797 /* Remember which order dummy variables are accessed in. */
799 sym->dummy_order = next_dummy_order++;
803 /* Common subroutine called by attribute changing subroutines in order
804 to prevent them from changing a symbol that has been
805 use-associated. Returns zero if it is OK to change the symbol,
809 check_used (symbol_attribute *attr, const char *name, locus *where)
812 if (attr->use_assoc == 0)
816 where = &gfc_current_locus;
819 gfc_error ("Cannot change attributes of USE-associated symbol at %L",
822 gfc_error ("Cannot change attributes of USE-associated symbol %s at %L",
829 /* Generate an error because of a duplicate attribute. */
832 duplicate_attr (const char *attr, locus *where)
836 where = &gfc_current_locus;
838 gfc_error ("Duplicate %s attribute specified at %L", attr, where);
843 gfc_add_ext_attribute (symbol_attribute *attr, ext_attr_id_t ext_attr,
844 locus *where ATTRIBUTE_UNUSED)
846 attr->ext_attr |= 1 << ext_attr;
851 /* Called from decl.c (attr_decl1) to check attributes, when declared
855 gfc_add_attribute (symbol_attribute *attr, locus *where)
857 if (check_used (attr, NULL, where))
860 return check_conflict (attr, NULL, where);
865 gfc_add_allocatable (symbol_attribute *attr, locus *where)
868 if (check_used (attr, NULL, where))
871 if (attr->allocatable)
873 duplicate_attr ("ALLOCATABLE", where);
877 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
878 && gfc_find_state (COMP_INTERFACE) == FAILURE)
880 gfc_error ("ALLOCATABLE specified outside of INTERFACE body at %L",
885 attr->allocatable = 1;
886 return check_conflict (attr, NULL, where);
891 gfc_add_codimension (symbol_attribute *attr, const char *name, locus *where)
894 if (check_used (attr, name, where))
897 if (attr->codimension)
899 duplicate_attr ("CODIMENSION", where);
903 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
904 && gfc_find_state (COMP_INTERFACE) == FAILURE)
906 gfc_error ("CODIMENSION specified for '%s' outside its INTERFACE body "
907 "at %L", name, where);
911 attr->codimension = 1;
912 return check_conflict (attr, name, where);
917 gfc_add_dimension (symbol_attribute *attr, const char *name, locus *where)
920 if (check_used (attr, name, where))
925 duplicate_attr ("DIMENSION", where);
929 if (attr->flavor == FL_PROCEDURE && attr->if_source == IFSRC_IFBODY
930 && gfc_find_state (COMP_INTERFACE) == FAILURE)
932 gfc_error ("DIMENSION specified for '%s' outside its INTERFACE body "
933 "at %L", name, where);
938 return check_conflict (attr, name, where);
943 gfc_add_contiguous (symbol_attribute *attr, const char *name, locus *where)
946 if (check_used (attr, name, where))
949 attr->contiguous = 1;
950 return check_conflict (attr, name, where);
955 gfc_add_external (symbol_attribute *attr, locus *where)
958 if (check_used (attr, NULL, where))
963 duplicate_attr ("EXTERNAL", where);
967 if (attr->pointer && attr->if_source != IFSRC_IFBODY)
970 attr->proc_pointer = 1;
975 return check_conflict (attr, NULL, where);
980 gfc_add_intrinsic (symbol_attribute *attr, locus *where)
983 if (check_used (attr, NULL, where))
988 duplicate_attr ("INTRINSIC", where);
994 return check_conflict (attr, NULL, where);
999 gfc_add_optional (symbol_attribute *attr, locus *where)
1002 if (check_used (attr, NULL, where))
1007 duplicate_attr ("OPTIONAL", where);
1012 return check_conflict (attr, NULL, where);
1017 gfc_add_pointer (symbol_attribute *attr, locus *where)
1020 if (check_used (attr, NULL, where))
1023 if (attr->pointer && !(attr->if_source == IFSRC_IFBODY
1024 && gfc_find_state (COMP_INTERFACE) == FAILURE))
1026 duplicate_attr ("POINTER", where);
1030 if (attr->procedure || (attr->external && attr->if_source != IFSRC_IFBODY)
1031 || (attr->if_source == IFSRC_IFBODY
1032 && gfc_find_state (COMP_INTERFACE) == FAILURE))
1033 attr->proc_pointer = 1;
1037 return check_conflict (attr, NULL, where);
1042 gfc_add_cray_pointer (symbol_attribute *attr, locus *where)
1045 if (check_used (attr, NULL, where))
1048 attr->cray_pointer = 1;
1049 return check_conflict (attr, NULL, where);
1054 gfc_add_cray_pointee (symbol_attribute *attr, locus *where)
1057 if (check_used (attr, NULL, where))
1060 if (attr->cray_pointee)
1062 gfc_error ("Cray Pointee at %L appears in multiple pointer()"
1063 " statements", where);
1067 attr->cray_pointee = 1;
1068 return check_conflict (attr, NULL, where);
1073 gfc_add_protected (symbol_attribute *attr, const char *name, locus *where)
1075 if (check_used (attr, name, where))
1078 if (attr->is_protected)
1080 if (gfc_notify_std (GFC_STD_LEGACY,
1081 "Duplicate PROTECTED attribute specified at %L",
1087 attr->is_protected = 1;
1088 return check_conflict (attr, name, where);
1093 gfc_add_result (symbol_attribute *attr, const char *name, locus *where)
1096 if (check_used (attr, name, where))
1100 return check_conflict (attr, name, where);
1105 gfc_add_save (symbol_attribute *attr, save_state s, const char *name,
1109 if (check_used (attr, name, where))
1112 if (s == SAVE_EXPLICIT && gfc_pure (NULL))
1115 ("SAVE attribute at %L cannot be specified in a PURE procedure",
1120 if (s == SAVE_EXPLICIT && gfc_implicit_pure (NULL))
1121 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1123 if (s == SAVE_EXPLICIT && attr->save == SAVE_EXPLICIT)
1125 if (gfc_notify_std (GFC_STD_LEGACY,
1126 "Duplicate SAVE attribute specified at %L",
1133 return check_conflict (attr, name, where);
1138 gfc_add_value (symbol_attribute *attr, const char *name, locus *where)
1141 if (check_used (attr, name, where))
1146 if (gfc_notify_std (GFC_STD_LEGACY,
1147 "Duplicate VALUE attribute specified at %L",
1154 return check_conflict (attr, name, where);
1159 gfc_add_volatile (symbol_attribute *attr, const char *name, locus *where)
1161 /* No check_used needed as 11.2.1 of the F2003 standard allows
1162 that the local identifier made accessible by a use statement can be
1163 given a VOLATILE attribute - unless it is a coarray (F2008, C560). */
1165 if (attr->volatile_ && attr->volatile_ns == gfc_current_ns)
1166 if (gfc_notify_std (GFC_STD_LEGACY,
1167 "Duplicate VOLATILE attribute specified at %L", where)
1171 attr->volatile_ = 1;
1172 attr->volatile_ns = gfc_current_ns;
1173 return check_conflict (attr, name, where);
1178 gfc_add_asynchronous (symbol_attribute *attr, const char *name, locus *where)
1180 /* No check_used needed as 11.2.1 of the F2003 standard allows
1181 that the local identifier made accessible by a use statement can be
1182 given a ASYNCHRONOUS attribute. */
1184 if (attr->asynchronous && attr->asynchronous_ns == gfc_current_ns)
1185 if (gfc_notify_std (GFC_STD_LEGACY,
1186 "Duplicate ASYNCHRONOUS attribute specified at %L",
1190 attr->asynchronous = 1;
1191 attr->asynchronous_ns = gfc_current_ns;
1192 return check_conflict (attr, name, where);
1197 gfc_add_threadprivate (symbol_attribute *attr, const char *name, locus *where)
1200 if (check_used (attr, name, where))
1203 if (attr->threadprivate)
1205 duplicate_attr ("THREADPRIVATE", where);
1209 attr->threadprivate = 1;
1210 return check_conflict (attr, name, where);
1215 gfc_add_target (symbol_attribute *attr, locus *where)
1218 if (check_used (attr, NULL, where))
1223 duplicate_attr ("TARGET", where);
1228 return check_conflict (attr, NULL, where);
1233 gfc_add_dummy (symbol_attribute *attr, const char *name, locus *where)
1236 if (check_used (attr, name, where))
1239 /* Duplicate dummy arguments are allowed due to ENTRY statements. */
1241 return check_conflict (attr, name, where);
1246 gfc_add_in_common (symbol_attribute *attr, const char *name, locus *where)
1249 if (check_used (attr, name, where))
1252 /* Duplicate attribute already checked for. */
1253 attr->in_common = 1;
1254 return check_conflict (attr, name, where);
1259 gfc_add_in_equivalence (symbol_attribute *attr, const char *name, locus *where)
1262 /* Duplicate attribute already checked for. */
1263 attr->in_equivalence = 1;
1264 if (check_conflict (attr, name, where) == FAILURE)
1267 if (attr->flavor == FL_VARIABLE)
1270 return gfc_add_flavor (attr, FL_VARIABLE, name, where);
1275 gfc_add_data (symbol_attribute *attr, const char *name, locus *where)
1278 if (check_used (attr, name, where))
1282 return check_conflict (attr, name, where);
1287 gfc_add_in_namelist (symbol_attribute *attr, const char *name, locus *where)
1290 attr->in_namelist = 1;
1291 return check_conflict (attr, name, where);
1296 gfc_add_sequence (symbol_attribute *attr, const char *name, locus *where)
1299 if (check_used (attr, name, where))
1303 return check_conflict (attr, name, where);
1308 gfc_add_elemental (symbol_attribute *attr, locus *where)
1311 if (check_used (attr, NULL, where))
1314 if (attr->elemental)
1316 duplicate_attr ("ELEMENTAL", where);
1320 attr->elemental = 1;
1321 return check_conflict (attr, NULL, where);
1326 gfc_add_pure (symbol_attribute *attr, locus *where)
1329 if (check_used (attr, NULL, where))
1334 duplicate_attr ("PURE", where);
1339 return check_conflict (attr, NULL, where);
1344 gfc_add_recursive (symbol_attribute *attr, locus *where)
1347 if (check_used (attr, NULL, where))
1350 if (attr->recursive)
1352 duplicate_attr ("RECURSIVE", where);
1356 attr->recursive = 1;
1357 return check_conflict (attr, NULL, where);
1362 gfc_add_entry (symbol_attribute *attr, const char *name, locus *where)
1365 if (check_used (attr, name, where))
1370 duplicate_attr ("ENTRY", where);
1375 return check_conflict (attr, name, where);
1380 gfc_add_function (symbol_attribute *attr, const char *name, locus *where)
1383 if (attr->flavor != FL_PROCEDURE
1384 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1388 return check_conflict (attr, name, where);
1393 gfc_add_subroutine (symbol_attribute *attr, const char *name, locus *where)
1396 if (attr->flavor != FL_PROCEDURE
1397 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1400 attr->subroutine = 1;
1401 return check_conflict (attr, name, where);
1406 gfc_add_generic (symbol_attribute *attr, const char *name, locus *where)
1409 if (attr->flavor != FL_PROCEDURE
1410 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1414 return check_conflict (attr, name, where);
1419 gfc_add_proc (symbol_attribute *attr, const char *name, locus *where)
1422 if (check_used (attr, NULL, where))
1425 if (attr->flavor != FL_PROCEDURE
1426 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1429 if (attr->procedure)
1431 duplicate_attr ("PROCEDURE", where);
1435 attr->procedure = 1;
1437 return check_conflict (attr, NULL, where);
1442 gfc_add_abstract (symbol_attribute* attr, locus* where)
1446 duplicate_attr ("ABSTRACT", where);
1455 /* Flavors are special because some flavors are not what Fortran
1456 considers attributes and can be reaffirmed multiple times. */
1459 gfc_add_flavor (symbol_attribute *attr, sym_flavor f, const char *name,
1463 if ((f == FL_PROGRAM || f == FL_BLOCK_DATA || f == FL_MODULE
1464 || f == FL_PARAMETER || f == FL_LABEL || f == FL_DERIVED
1465 || f == FL_NAMELIST) && check_used (attr, name, where))
1468 if (attr->flavor == f && f == FL_VARIABLE)
1471 if (attr->flavor != FL_UNKNOWN)
1474 where = &gfc_current_locus;
1477 gfc_error ("%s attribute of '%s' conflicts with %s attribute at %L",
1478 gfc_code2string (flavors, attr->flavor), name,
1479 gfc_code2string (flavors, f), where);
1481 gfc_error ("%s attribute conflicts with %s attribute at %L",
1482 gfc_code2string (flavors, attr->flavor),
1483 gfc_code2string (flavors, f), where);
1490 return check_conflict (attr, name, where);
1495 gfc_add_procedure (symbol_attribute *attr, procedure_type t,
1496 const char *name, locus *where)
1499 if (check_used (attr, name, where))
1502 if (attr->flavor != FL_PROCEDURE
1503 && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE)
1507 where = &gfc_current_locus;
1509 if (attr->proc != PROC_UNKNOWN)
1511 gfc_error ("%s procedure at %L is already declared as %s procedure",
1512 gfc_code2string (procedures, t), where,
1513 gfc_code2string (procedures, attr->proc));
1520 /* Statement functions are always scalar and functions. */
1521 if (t == PROC_ST_FUNCTION
1522 && ((!attr->function && gfc_add_function (attr, name, where) == FAILURE)
1523 || attr->dimension))
1526 return check_conflict (attr, name, where);
1531 gfc_add_intent (symbol_attribute *attr, sym_intent intent, locus *where)
1534 if (check_used (attr, NULL, where))
1537 if (attr->intent == INTENT_UNKNOWN)
1539 attr->intent = intent;
1540 return check_conflict (attr, NULL, where);
1544 where = &gfc_current_locus;
1546 gfc_error ("INTENT (%s) conflicts with INTENT(%s) at %L",
1547 gfc_intent_string (attr->intent),
1548 gfc_intent_string (intent), where);
1554 /* No checks for use-association in public and private statements. */
1557 gfc_add_access (symbol_attribute *attr, gfc_access access,
1558 const char *name, locus *where)
1561 if (attr->access == ACCESS_UNKNOWN
1562 || (attr->use_assoc && attr->access != ACCESS_PRIVATE))
1564 attr->access = access;
1565 return check_conflict (attr, name, where);
1569 where = &gfc_current_locus;
1570 gfc_error ("ACCESS specification at %L was already specified", where);
1576 /* Set the is_bind_c field for the given symbol_attribute. */
1579 gfc_add_is_bind_c (symbol_attribute *attr, const char *name, locus *where,
1580 int is_proc_lang_bind_spec)
1583 if (is_proc_lang_bind_spec == 0 && attr->flavor == FL_PROCEDURE)
1584 gfc_error_now ("BIND(C) attribute at %L can only be used for "
1585 "variables or common blocks", where);
1586 else if (attr->is_bind_c)
1587 gfc_error_now ("Duplicate BIND attribute specified at %L", where);
1589 attr->is_bind_c = 1;
1592 where = &gfc_current_locus;
1594 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BIND(C) at %L", where)
1598 return check_conflict (attr, name, where);
1602 /* Set the extension field for the given symbol_attribute. */
1605 gfc_add_extension (symbol_attribute *attr, locus *where)
1608 where = &gfc_current_locus;
1610 if (attr->extension)
1611 gfc_error_now ("Duplicate EXTENDS attribute specified at %L", where);
1613 attr->extension = 1;
1615 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: EXTENDS at %L", where)
1624 gfc_add_explicit_interface (gfc_symbol *sym, ifsrc source,
1625 gfc_formal_arglist * formal, locus *where)
1628 if (check_used (&sym->attr, sym->name, where))
1632 where = &gfc_current_locus;
1634 if (sym->attr.if_source != IFSRC_UNKNOWN
1635 && sym->attr.if_source != IFSRC_DECL)
1637 gfc_error ("Symbol '%s' at %L already has an explicit interface",
1642 if (source == IFSRC_IFBODY && (sym->attr.dimension || sym->attr.allocatable))
1644 gfc_error ("'%s' at %L has attributes specified outside its INTERFACE "
1645 "body", sym->name, where);
1649 sym->formal = formal;
1650 sym->attr.if_source = source;
1656 /* Add a type to a symbol. */
1659 gfc_add_type (gfc_symbol *sym, gfc_typespec *ts, locus *where)
1665 where = &gfc_current_locus;
1668 type = sym->result->ts.type;
1670 type = sym->ts.type;
1672 if (sym->attr.result && type == BT_UNKNOWN && sym->ns->proc_name)
1673 type = sym->ns->proc_name->ts.type;
1675 if (type != BT_UNKNOWN && !(sym->attr.function && sym->attr.implicit_type))
1677 if (sym->attr.use_assoc)
1678 gfc_error ("Symbol '%s' at %L conflicts with symbol from module '%s', "
1679 "use-associated at %L", sym->name, where, sym->module,
1682 gfc_error ("Symbol '%s' at %L already has basic type of %s", sym->name,
1683 where, gfc_basic_typename (type));
1687 if (sym->attr.procedure && sym->ts.interface)
1689 gfc_error ("Procedure '%s' at %L may not have basic type of %s",
1690 sym->name, where, gfc_basic_typename (ts->type));
1694 flavor = sym->attr.flavor;
1696 if (flavor == FL_PROGRAM || flavor == FL_BLOCK_DATA || flavor == FL_MODULE
1697 || flavor == FL_LABEL
1698 || (flavor == FL_PROCEDURE && sym->attr.subroutine)
1699 || flavor == FL_DERIVED || flavor == FL_NAMELIST)
1701 gfc_error ("Symbol '%s' at %L cannot have a type", sym->name, where);
1710 /* Clears all attributes. */
1713 gfc_clear_attr (symbol_attribute *attr)
1715 memset (attr, 0, sizeof (symbol_attribute));
1719 /* Check for missing attributes in the new symbol. Currently does
1720 nothing, but it's not clear that it is unnecessary yet. */
1723 gfc_missing_attr (symbol_attribute *attr ATTRIBUTE_UNUSED,
1724 locus *where ATTRIBUTE_UNUSED)
1731 /* Copy an attribute to a symbol attribute, bit by bit. Some
1732 attributes have a lot of side-effects but cannot be present given
1733 where we are called from, so we ignore some bits. */
1736 gfc_copy_attr (symbol_attribute *dest, symbol_attribute *src, locus *where)
1738 int is_proc_lang_bind_spec;
1740 /* In line with the other attributes, we only add bits but do not remove
1741 them; cf. also PR 41034. */
1742 dest->ext_attr |= src->ext_attr;
1744 if (src->allocatable && gfc_add_allocatable (dest, where) == FAILURE)
1747 if (src->dimension && gfc_add_dimension (dest, NULL, where) == FAILURE)
1749 if (src->codimension && gfc_add_codimension (dest, NULL, where) == FAILURE)
1751 if (src->contiguous && gfc_add_contiguous (dest, NULL, where) == FAILURE)
1753 if (src->optional && gfc_add_optional (dest, where) == FAILURE)
1755 if (src->pointer && gfc_add_pointer (dest, where) == FAILURE)
1757 if (src->is_protected && gfc_add_protected (dest, NULL, where) == FAILURE)
1759 if (src->save && gfc_add_save (dest, src->save, NULL, where) == FAILURE)
1761 if (src->value && gfc_add_value (dest, NULL, where) == FAILURE)
1763 if (src->volatile_ && gfc_add_volatile (dest, NULL, where) == FAILURE)
1765 if (src->asynchronous && gfc_add_asynchronous (dest, NULL, where) == FAILURE)
1767 if (src->threadprivate
1768 && gfc_add_threadprivate (dest, NULL, where) == FAILURE)
1770 if (src->target && gfc_add_target (dest, where) == FAILURE)
1772 if (src->dummy && gfc_add_dummy (dest, NULL, where) == FAILURE)
1774 if (src->result && gfc_add_result (dest, NULL, where) == FAILURE)
1779 if (src->in_namelist && gfc_add_in_namelist (dest, NULL, where) == FAILURE)
1782 if (src->in_common && gfc_add_in_common (dest, NULL, where) == FAILURE)
1785 if (src->generic && gfc_add_generic (dest, NULL, where) == FAILURE)
1787 if (src->function && gfc_add_function (dest, NULL, where) == FAILURE)
1789 if (src->subroutine && gfc_add_subroutine (dest, NULL, where) == FAILURE)
1792 if (src->sequence && gfc_add_sequence (dest, NULL, where) == FAILURE)
1794 if (src->elemental && gfc_add_elemental (dest, where) == FAILURE)
1796 if (src->pure && gfc_add_pure (dest, where) == FAILURE)
1798 if (src->recursive && gfc_add_recursive (dest, where) == FAILURE)
1801 if (src->flavor != FL_UNKNOWN
1802 && gfc_add_flavor (dest, src->flavor, NULL, where) == FAILURE)
1805 if (src->intent != INTENT_UNKNOWN
1806 && gfc_add_intent (dest, src->intent, where) == FAILURE)
1809 if (src->access != ACCESS_UNKNOWN
1810 && gfc_add_access (dest, src->access, NULL, where) == FAILURE)
1813 if (gfc_missing_attr (dest, where) == FAILURE)
1816 if (src->cray_pointer && gfc_add_cray_pointer (dest, where) == FAILURE)
1818 if (src->cray_pointee && gfc_add_cray_pointee (dest, where) == FAILURE)
1821 is_proc_lang_bind_spec = (src->flavor == FL_PROCEDURE ? 1 : 0);
1823 && gfc_add_is_bind_c (dest, NULL, where, is_proc_lang_bind_spec)
1827 if (src->is_c_interop)
1828 dest->is_c_interop = 1;
1832 if (src->external && gfc_add_external (dest, where) == FAILURE)
1834 if (src->intrinsic && gfc_add_intrinsic (dest, where) == FAILURE)
1836 if (src->proc_pointer)
1837 dest->proc_pointer = 1;
1846 /************** Component name management ************/
1848 /* Component names of a derived type form their own little namespaces
1849 that are separate from all other spaces. The space is composed of
1850 a singly linked list of gfc_component structures whose head is
1851 located in the parent symbol. */
1854 /* Add a component name to a symbol. The call fails if the name is
1855 already present. On success, the component pointer is modified to
1856 point to the additional component structure. */
1859 gfc_add_component (gfc_symbol *sym, const char *name,
1860 gfc_component **component)
1862 gfc_component *p, *tail;
1866 for (p = sym->components; p; p = p->next)
1868 if (strcmp (p->name, name) == 0)
1870 gfc_error ("Component '%s' at %C already declared at %L",
1878 if (sym->attr.extension
1879 && gfc_find_component (sym->components->ts.u.derived, name, true, true))
1881 gfc_error ("Component '%s' at %C already in the parent type "
1882 "at %L", name, &sym->components->ts.u.derived->declared_at);
1886 /* Allocate a new component. */
1887 p = gfc_get_component ();
1890 sym->components = p;
1894 p->name = gfc_get_string (name);
1895 p->loc = gfc_current_locus;
1896 p->ts.type = BT_UNKNOWN;
1903 /* Recursive function to switch derived types of all symbol in a
1907 switch_types (gfc_symtree *st, gfc_symbol *from, gfc_symbol *to)
1915 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived == from)
1916 sym->ts.u.derived = to;
1918 switch_types (st->left, from, to);
1919 switch_types (st->right, from, to);
1923 /* This subroutine is called when a derived type is used in order to
1924 make the final determination about which version to use. The
1925 standard requires that a type be defined before it is 'used', but
1926 such types can appear in IMPLICIT statements before the actual
1927 definition. 'Using' in this context means declaring a variable to
1928 be that type or using the type constructor.
1930 If a type is used and the components haven't been defined, then we
1931 have to have a derived type in a parent unit. We find the node in
1932 the other namespace and point the symtree node in this namespace to
1933 that node. Further reference to this name point to the correct
1934 node. If we can't find the node in a parent namespace, then we have
1937 This subroutine takes a pointer to a symbol node and returns a
1938 pointer to the translated node or NULL for an error. Usually there
1939 is no translation and we return the node we were passed. */
1942 gfc_use_derived (gfc_symbol *sym)
1952 if (sym->components != NULL || sym->attr.zero_comp)
1953 return sym; /* Already defined. */
1955 if (sym->ns->parent == NULL)
1958 if (gfc_find_symbol (sym->name, sym->ns->parent, 1, &s))
1960 gfc_error ("Symbol '%s' at %C is ambiguous", sym->name);
1964 if (s == NULL || s->attr.flavor != FL_DERIVED)
1967 /* Get rid of symbol sym, translating all references to s. */
1968 for (i = 0; i < GFC_LETTERS; i++)
1970 t = &sym->ns->default_type[i];
1971 if (t->u.derived == sym)
1975 st = gfc_find_symtree (sym->ns->sym_root, sym->name);
1980 /* Unlink from list of modified symbols. */
1981 gfc_commit_symbol (sym);
1983 switch_types (sym->ns->sym_root, sym, s);
1985 /* TODO: Also have to replace sym -> s in other lists like
1986 namelists, common lists and interface lists. */
1987 gfc_free_symbol (sym);
1992 gfc_error ("Derived type '%s' at %C is being used before it is defined",
1998 /* Given a derived type node and a component name, try to locate the
1999 component structure. Returns the NULL pointer if the component is
2000 not found or the components are private. If noaccess is set, no access
2004 gfc_find_component (gfc_symbol *sym, const char *name,
2005 bool noaccess, bool silent)
2009 if (name == NULL || sym == NULL)
2012 sym = gfc_use_derived (sym);
2017 for (p = sym->components; p; p = p->next)
2018 if (strcmp (p->name, name) == 0)
2022 && sym->attr.extension
2023 && sym->components->ts.type == BT_DERIVED)
2025 p = gfc_find_component (sym->components->ts.u.derived, name,
2027 /* Do not overwrite the error. */
2032 if (p == NULL && !silent)
2033 gfc_error ("'%s' at %C is not a member of the '%s' structure",
2036 else if (sym->attr.use_assoc && !noaccess)
2038 bool is_parent_comp = sym->attr.extension && (p == sym->components);
2039 if (p->attr.access == ACCESS_PRIVATE ||
2040 (p->attr.access != ACCESS_PUBLIC
2041 && sym->component_access == ACCESS_PRIVATE
2042 && !is_parent_comp))
2045 gfc_error ("Component '%s' at %C is a PRIVATE component of '%s'",
2055 /* Given a symbol, free all of the component structures and everything
2059 free_components (gfc_component *p)
2067 gfc_free_array_spec (p->as);
2068 gfc_free_expr (p->initializer);
2070 gfc_free_formal_arglist (p->formal);
2071 gfc_free_namespace (p->formal_ns);
2078 /******************** Statement label management ********************/
2080 /* Comparison function for statement labels, used for managing the
2084 compare_st_labels (void *a1, void *b1)
2086 int a = ((gfc_st_label *) a1)->value;
2087 int b = ((gfc_st_label *) b1)->value;
2093 /* Free a single gfc_st_label structure, making sure the tree is not
2094 messed up. This function is called only when some parse error
2098 gfc_free_st_label (gfc_st_label *label)
2104 gfc_delete_bbt (&gfc_current_ns->st_labels, label, compare_st_labels);
2106 if (label->format != NULL)
2107 gfc_free_expr (label->format);
2113 /* Free a whole tree of gfc_st_label structures. */
2116 free_st_labels (gfc_st_label *label)
2122 free_st_labels (label->left);
2123 free_st_labels (label->right);
2125 if (label->format != NULL)
2126 gfc_free_expr (label->format);
2131 /* Given a label number, search for and return a pointer to the label
2132 structure, creating it if it does not exist. */
2135 gfc_get_st_label (int labelno)
2140 if (gfc_current_state () == COMP_DERIVED)
2141 ns = gfc_current_block ()->f2k_derived;
2144 /* Find the namespace of the scoping unit:
2145 If we're in a BLOCK construct, jump to the parent namespace. */
2146 ns = gfc_current_ns;
2147 while (ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL)
2151 /* First see if the label is already in this namespace. */
2155 if (lp->value == labelno)
2158 if (lp->value < labelno)
2164 lp = XCNEW (gfc_st_label);
2166 lp->value = labelno;
2167 lp->defined = ST_LABEL_UNKNOWN;
2168 lp->referenced = ST_LABEL_UNKNOWN;
2170 gfc_insert_bbt (&ns->st_labels, lp, compare_st_labels);
2176 /* Called when a statement with a statement label is about to be
2177 accepted. We add the label to the list of the current namespace,
2178 making sure it hasn't been defined previously and referenced
2182 gfc_define_st_label (gfc_st_label *lp, gfc_sl_type type, locus *label_locus)
2186 labelno = lp->value;
2188 if (lp->defined != ST_LABEL_UNKNOWN)
2189 gfc_error ("Duplicate statement label %d at %L and %L", labelno,
2190 &lp->where, label_locus);
2193 lp->where = *label_locus;
2197 case ST_LABEL_FORMAT:
2198 if (lp->referenced == ST_LABEL_TARGET)
2199 gfc_error ("Label %d at %C already referenced as branch target",
2202 lp->defined = ST_LABEL_FORMAT;
2206 case ST_LABEL_TARGET:
2207 if (lp->referenced == ST_LABEL_FORMAT)
2208 gfc_error ("Label %d at %C already referenced as a format label",
2211 lp->defined = ST_LABEL_TARGET;
2216 lp->defined = ST_LABEL_BAD_TARGET;
2217 lp->referenced = ST_LABEL_BAD_TARGET;
2223 /* Reference a label. Given a label and its type, see if that
2224 reference is consistent with what is known about that label,
2225 updating the unknown state. Returns FAILURE if something goes
2229 gfc_reference_st_label (gfc_st_label *lp, gfc_sl_type type)
2231 gfc_sl_type label_type;
2238 labelno = lp->value;
2240 if (lp->defined != ST_LABEL_UNKNOWN)
2241 label_type = lp->defined;
2244 label_type = lp->referenced;
2245 lp->where = gfc_current_locus;
2248 if (label_type == ST_LABEL_FORMAT && type == ST_LABEL_TARGET)
2250 gfc_error ("Label %d at %C previously used as a FORMAT label", labelno);
2255 if ((label_type == ST_LABEL_TARGET || label_type == ST_LABEL_BAD_TARGET)
2256 && type == ST_LABEL_FORMAT)
2258 gfc_error ("Label %d at %C previously used as branch target", labelno);
2263 lp->referenced = type;
2271 /************** Symbol table management subroutines ****************/
2273 /* Basic details: Fortran 95 requires a potentially unlimited number
2274 of distinct namespaces when compiling a program unit. This case
2275 occurs during a compilation of internal subprograms because all of
2276 the internal subprograms must be read before we can start
2277 generating code for the host.
2279 Given the tricky nature of the Fortran grammar, we must be able to
2280 undo changes made to a symbol table if the current interpretation
2281 of a statement is found to be incorrect. Whenever a symbol is
2282 looked up, we make a copy of it and link to it. All of these
2283 symbols are kept in a singly linked list so that we can commit or
2284 undo the changes at a later time.
2286 A symtree may point to a symbol node outside of its namespace. In
2287 this case, that symbol has been used as a host associated variable
2288 at some previous time. */
2290 /* Allocate a new namespace structure. Copies the implicit types from
2291 PARENT if PARENT_TYPES is set. */
2294 gfc_get_namespace (gfc_namespace *parent, int parent_types)
2301 ns = XCNEW (gfc_namespace);
2302 ns->sym_root = NULL;
2303 ns->uop_root = NULL;
2304 ns->tb_sym_root = NULL;
2305 ns->finalizers = NULL;
2306 ns->default_access = ACCESS_UNKNOWN;
2307 ns->parent = parent;
2309 for (in = GFC_INTRINSIC_BEGIN; in != GFC_INTRINSIC_END; in++)
2311 ns->operator_access[in] = ACCESS_UNKNOWN;
2312 ns->tb_op[in] = NULL;
2315 /* Initialize default implicit types. */
2316 for (i = 'a'; i <= 'z'; i++)
2318 ns->set_flag[i - 'a'] = 0;
2319 ts = &ns->default_type[i - 'a'];
2321 if (parent_types && ns->parent != NULL)
2323 /* Copy parent settings. */
2324 *ts = ns->parent->default_type[i - 'a'];
2328 if (gfc_option.flag_implicit_none != 0)
2334 if ('i' <= i && i <= 'n')
2336 ts->type = BT_INTEGER;
2337 ts->kind = gfc_default_integer_kind;
2342 ts->kind = gfc_default_real_kind;
2352 /* Comparison function for symtree nodes. */
2355 compare_symtree (void *_st1, void *_st2)
2357 gfc_symtree *st1, *st2;
2359 st1 = (gfc_symtree *) _st1;
2360 st2 = (gfc_symtree *) _st2;
2362 return strcmp (st1->name, st2->name);
2366 /* Allocate a new symtree node and associate it with the new symbol. */
2369 gfc_new_symtree (gfc_symtree **root, const char *name)
2373 st = XCNEW (gfc_symtree);
2374 st->name = gfc_get_string (name);
2376 gfc_insert_bbt (root, st, compare_symtree);
2381 /* Delete a symbol from the tree. Does not free the symbol itself! */
2384 gfc_delete_symtree (gfc_symtree **root, const char *name)
2386 gfc_symtree st, *st0;
2388 st0 = gfc_find_symtree (*root, name);
2390 st.name = gfc_get_string (name);
2391 gfc_delete_bbt (root, &st, compare_symtree);
2397 /* Given a root symtree node and a name, try to find the symbol within
2398 the namespace. Returns NULL if the symbol is not found. */
2401 gfc_find_symtree (gfc_symtree *st, const char *name)
2407 c = strcmp (name, st->name);
2411 st = (c < 0) ? st->left : st->right;
2418 /* Return a symtree node with a name that is guaranteed to be unique
2419 within the namespace and corresponds to an illegal fortran name. */
2422 gfc_get_unique_symtree (gfc_namespace *ns)
2424 char name[GFC_MAX_SYMBOL_LEN + 1];
2425 static int serial = 0;
2427 sprintf (name, "@%d", serial++);
2428 return gfc_new_symtree (&ns->sym_root, name);
2432 /* Given a name find a user operator node, creating it if it doesn't
2433 exist. These are much simpler than symbols because they can't be
2434 ambiguous with one another. */
2437 gfc_get_uop (const char *name)
2442 st = gfc_find_symtree (gfc_current_ns->uop_root, name);
2446 st = gfc_new_symtree (&gfc_current_ns->uop_root, name);
2448 uop = st->n.uop = XCNEW (gfc_user_op);
2449 uop->name = gfc_get_string (name);
2450 uop->access = ACCESS_UNKNOWN;
2451 uop->ns = gfc_current_ns;
2457 /* Given a name find the user operator node. Returns NULL if it does
2461 gfc_find_uop (const char *name, gfc_namespace *ns)
2466 ns = gfc_current_ns;
2468 st = gfc_find_symtree (ns->uop_root, name);
2469 return (st == NULL) ? NULL : st->n.uop;
2473 /* Remove a gfc_symbol structure and everything it points to. */
2476 gfc_free_symbol (gfc_symbol *sym)
2482 gfc_free_array_spec (sym->as);
2484 free_components (sym->components);
2486 gfc_free_expr (sym->value);
2488 gfc_free_namelist (sym->namelist);
2490 gfc_free_namespace (sym->formal_ns);
2492 if (!sym->attr.generic_copy)
2493 gfc_free_interface (sym->generic);
2495 gfc_free_formal_arglist (sym->formal);
2497 gfc_free_namespace (sym->f2k_derived);
2503 /* Decrease the reference counter and free memory when we reach zero. */
2506 gfc_release_symbol (gfc_symbol *sym)
2511 if (sym->formal_ns != NULL && sym->refs == 2)
2513 /* As formal_ns contains a reference to sym, delete formal_ns just
2514 before the deletion of sym. */
2515 gfc_namespace *ns = sym->formal_ns;
2516 sym->formal_ns = NULL;
2517 gfc_free_namespace (ns);
2524 gcc_assert (sym->refs == 0);
2525 gfc_free_symbol (sym);
2529 /* Allocate and initialize a new symbol node. */
2532 gfc_new_symbol (const char *name, gfc_namespace *ns)
2536 p = XCNEW (gfc_symbol);
2538 gfc_clear_ts (&p->ts);
2539 gfc_clear_attr (&p->attr);
2542 p->declared_at = gfc_current_locus;
2544 if (strlen (name) > GFC_MAX_SYMBOL_LEN)
2545 gfc_internal_error ("new_symbol(): Symbol name too long");
2547 p->name = gfc_get_string (name);
2549 /* Make sure flags for symbol being C bound are clear initially. */
2550 p->attr.is_bind_c = 0;
2551 p->attr.is_iso_c = 0;
2552 /* Make sure the binding label field has a Nul char to start. */
2553 p->binding_label[0] = '\0';
2555 /* Clear the ptrs we may need. */
2556 p->common_block = NULL;
2557 p->f2k_derived = NULL;
2564 /* Generate an error if a symbol is ambiguous. */
2567 ambiguous_symbol (const char *name, gfc_symtree *st)
2570 if (st->n.sym->module)
2571 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2572 "from module '%s'", name, st->n.sym->name, st->n.sym->module);
2574 gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' "
2575 "from current program unit", name, st->n.sym->name);
2579 /* If we're in a SELECT TYPE block, check if the variable 'st' matches any
2580 selector on the stack. If yes, replace it by the corresponding temporary. */
2583 select_type_insert_tmp (gfc_symtree **st)
2585 gfc_select_type_stack *stack = select_type_stack;
2586 for (; stack; stack = stack->prev)
2587 if ((*st)->n.sym == stack->selector && stack->tmp)
2592 /* Look for a symtree in the current procedure -- that is, go up to
2593 parent namespaces but only if inside a BLOCK. Returns NULL if not found. */
2596 gfc_find_symtree_in_proc (const char* name, gfc_namespace* ns)
2600 gfc_symtree* st = gfc_find_symtree (ns->sym_root, name);
2604 if (!ns->construct_entities)
2613 /* Search for a symtree starting in the current namespace, resorting to
2614 any parent namespaces if requested by a nonzero parent_flag.
2615 Returns nonzero if the name is ambiguous. */
2618 gfc_find_sym_tree (const char *name, gfc_namespace *ns, int parent_flag,
2619 gfc_symtree **result)
2624 ns = gfc_current_ns;
2628 st = gfc_find_symtree (ns->sym_root, name);
2631 select_type_insert_tmp (&st);
2634 /* Ambiguous generic interfaces are permitted, as long
2635 as the specific interfaces are different. */
2636 if (st->ambiguous && !st->n.sym->attr.generic)
2638 ambiguous_symbol (name, st);
2657 /* Same, but returns the symbol instead. */
2660 gfc_find_symbol (const char *name, gfc_namespace *ns, int parent_flag,
2661 gfc_symbol **result)
2666 i = gfc_find_sym_tree (name, ns, parent_flag, &st);
2671 *result = st->n.sym;
2677 /* Save symbol with the information necessary to back it out. */
2680 save_symbol_data (gfc_symbol *sym)
2683 if (sym->gfc_new || sym->old_symbol != NULL)
2686 sym->old_symbol = XCNEW (gfc_symbol);
2687 *(sym->old_symbol) = *sym;
2689 sym->tlink = changed_syms;
2694 /* Given a name, find a symbol, or create it if it does not exist yet
2695 in the current namespace. If the symbol is found we make sure that
2698 The integer return code indicates
2700 1 The symbol name was ambiguous
2701 2 The name meant to be established was already host associated.
2703 So if the return value is nonzero, then an error was issued. */
2706 gfc_get_sym_tree (const char *name, gfc_namespace *ns, gfc_symtree **result,
2707 bool allow_subroutine)
2712 /* This doesn't usually happen during resolution. */
2714 ns = gfc_current_ns;
2716 /* Try to find the symbol in ns. */
2717 st = gfc_find_symtree (ns->sym_root, name);
2721 /* If not there, create a new symbol. */
2722 p = gfc_new_symbol (name, ns);
2724 /* Add to the list of tentative symbols. */
2725 p->old_symbol = NULL;
2726 p->tlink = changed_syms;
2731 st = gfc_new_symtree (&ns->sym_root, name);
2738 /* Make sure the existing symbol is OK. Ambiguous
2739 generic interfaces are permitted, as long as the
2740 specific interfaces are different. */
2741 if (st->ambiguous && !st->n.sym->attr.generic)
2743 ambiguous_symbol (name, st);
2748 if (p->ns != ns && (!p->attr.function || ns->proc_name != p)
2749 && !(allow_subroutine && p->attr.subroutine)
2750 && !(ns->proc_name && ns->proc_name->attr.if_source == IFSRC_IFBODY
2751 && (ns->has_import_set || p->attr.imported)))
2753 /* Symbol is from another namespace. */
2754 gfc_error ("Symbol '%s' at %C has already been host associated",
2761 /* Copy in case this symbol is changed. */
2762 save_symbol_data (p);
2771 gfc_get_symbol (const char *name, gfc_namespace *ns, gfc_symbol **result)
2776 i = gfc_get_sym_tree (name, ns, &st, false);
2781 *result = st->n.sym;
2788 /* Subroutine that searches for a symbol, creating it if it doesn't
2789 exist, but tries to host-associate the symbol if possible. */
2792 gfc_get_ha_sym_tree (const char *name, gfc_symtree **result)
2797 i = gfc_find_sym_tree (name, gfc_current_ns, 0, &st);
2801 save_symbol_data (st->n.sym);
2806 if (gfc_current_ns->parent != NULL)
2808 i = gfc_find_sym_tree (name, gfc_current_ns->parent, 1, &st);
2819 return gfc_get_sym_tree (name, gfc_current_ns, result, false);
2824 gfc_get_ha_symbol (const char *name, gfc_symbol **result)
2829 i = gfc_get_ha_sym_tree (name, &st);
2832 *result = st->n.sym;
2839 /* Undoes all the changes made to symbols in the current statement.
2840 This subroutine is made simpler due to the fact that attributes are
2841 never removed once added. */
2844 gfc_undo_symbols (void)
2846 gfc_symbol *p, *q, *old;
2847 tentative_tbp *tbp, *tbq;
2849 for (p = changed_syms; p; p = q)
2855 /* Symbol was new. */
2856 if (p->attr.in_common && p->common_block && p->common_block->head)
2858 /* If the symbol was added to any common block, it
2859 needs to be removed to stop the resolver looking
2860 for a (possibly) dead symbol. */
2862 if (p->common_block->head == p)
2863 p->common_block->head = p->common_next;
2866 gfc_symbol *cparent, *csym;
2868 cparent = p->common_block->head;
2869 csym = cparent->common_next;
2874 csym = csym->common_next;
2877 gcc_assert(cparent->common_next == p);
2879 cparent->common_next = csym->common_next;
2883 gfc_delete_symtree (&p->ns->sym_root, p->name);
2885 gfc_release_symbol (p);
2889 /* Restore previous state of symbol. Just copy simple stuff. */
2891 old = p->old_symbol;
2893 p->ts.type = old->ts.type;
2894 p->ts.kind = old->ts.kind;
2896 p->attr = old->attr;
2898 if (p->value != old->value)
2900 gfc_free_expr (old->value);
2904 if (p->as != old->as)
2907 gfc_free_array_spec (p->as);
2911 p->generic = old->generic;
2912 p->component_access = old->component_access;
2914 if (p->namelist != NULL && old->namelist == NULL)
2916 gfc_free_namelist (p->namelist);
2921 if (p->namelist_tail != old->namelist_tail)
2923 gfc_free_namelist (old->namelist_tail);
2924 old->namelist_tail->next = NULL;
2928 p->namelist_tail = old->namelist_tail;
2930 if (p->formal != old->formal)
2932 gfc_free_formal_arglist (p->formal);
2933 p->formal = old->formal;
2936 free (p->old_symbol);
2937 p->old_symbol = NULL;
2941 changed_syms = NULL;
2943 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
2946 /* Procedure is already marked `error' by default. */
2949 tentative_tbp_list = NULL;
2953 /* Free sym->old_symbol. sym->old_symbol is mostly a shallow copy of sym; the
2954 components of old_symbol that might need deallocation are the "allocatables"
2955 that are restored in gfc_undo_symbols(), with two exceptions: namelist and
2956 namelist_tail. In case these differ between old_symbol and sym, it's just
2957 because sym->namelist has gotten a few more items. */
2960 free_old_symbol (gfc_symbol *sym)
2963 if (sym->old_symbol == NULL)
2966 if (sym->old_symbol->as != sym->as)
2967 gfc_free_array_spec (sym->old_symbol->as);
2969 if (sym->old_symbol->value != sym->value)
2970 gfc_free_expr (sym->old_symbol->value);
2972 if (sym->old_symbol->formal != sym->formal)
2973 gfc_free_formal_arglist (sym->old_symbol->formal);
2975 free (sym->old_symbol);
2976 sym->old_symbol = NULL;
2980 /* Makes the changes made in the current statement permanent-- gets
2981 rid of undo information. */
2984 gfc_commit_symbols (void)
2987 tentative_tbp *tbp, *tbq;
2989 for (p = changed_syms; p; p = q)
2995 free_old_symbol (p);
2997 changed_syms = NULL;
2999 for (tbp = tentative_tbp_list; tbp; tbp = tbq)
3002 tbp->proc->error = 0;
3005 tentative_tbp_list = NULL;
3009 /* Makes the changes made in one symbol permanent -- gets rid of undo
3013 gfc_commit_symbol (gfc_symbol *sym)
3017 if (changed_syms == sym)
3018 changed_syms = sym->tlink;
3021 for (p = changed_syms; p; p = p->tlink)
3022 if (p->tlink == sym)
3024 p->tlink = sym->tlink;
3033 free_old_symbol (sym);
3037 /* Recursively free trees containing type-bound procedures. */
3040 free_tb_tree (gfc_symtree *t)
3045 free_tb_tree (t->left);
3046 free_tb_tree (t->right);
3048 /* TODO: Free type-bound procedure structs themselves; probably needs some
3049 sort of ref-counting mechanism. */
3055 /* Recursive function that deletes an entire tree and all the common
3056 head structures it points to. */
3059 free_common_tree (gfc_symtree * common_tree)
3061 if (common_tree == NULL)
3064 free_common_tree (common_tree->left);
3065 free_common_tree (common_tree->right);
3071 /* Recursive function that deletes an entire tree and all the user
3072 operator nodes that it contains. */
3075 free_uop_tree (gfc_symtree *uop_tree)
3077 if (uop_tree == NULL)
3080 free_uop_tree (uop_tree->left);
3081 free_uop_tree (uop_tree->right);
3083 gfc_free_interface (uop_tree->n.uop->op);
3084 free (uop_tree->n.uop);
3089 /* Recursive function that deletes an entire tree and all the symbols
3090 that it contains. */
3093 free_sym_tree (gfc_symtree *sym_tree)
3095 if (sym_tree == NULL)
3098 free_sym_tree (sym_tree->left);
3099 free_sym_tree (sym_tree->right);
3101 gfc_release_symbol (sym_tree->n.sym);
3106 /* Free the derived type list. */
3109 gfc_free_dt_list (void)
3111 gfc_dt_list *dt, *n;
3113 for (dt = gfc_derived_types; dt; dt = n)
3119 gfc_derived_types = NULL;
3123 /* Free the gfc_equiv_info's. */
3126 gfc_free_equiv_infos (gfc_equiv_info *s)
3130 gfc_free_equiv_infos (s->next);
3135 /* Free the gfc_equiv_lists. */
3138 gfc_free_equiv_lists (gfc_equiv_list *l)
3142 gfc_free_equiv_lists (l->next);
3143 gfc_free_equiv_infos (l->equiv);
3148 /* Free a finalizer procedure list. */
3151 gfc_free_finalizer (gfc_finalizer* el)
3155 gfc_release_symbol (el->proc_sym);
3161 gfc_free_finalizer_list (gfc_finalizer* list)
3165 gfc_finalizer* current = list;
3167 gfc_free_finalizer (current);
3172 /* Create a new gfc_charlen structure and add it to a namespace.
3173 If 'old_cl' is given, the newly created charlen will be a copy of it. */
3176 gfc_new_charlen (gfc_namespace *ns, gfc_charlen *old_cl)
3179 cl = gfc_get_charlen ();
3184 /* Put into namespace, but don't allow reject_statement
3185 to free it if old_cl is given. */
3186 gfc_charlen **prev = &ns->cl_list;
3187 cl->next = ns->old_cl_list;
3188 while (*prev != ns->old_cl_list)
3189 prev = &(*prev)->next;
3191 ns->old_cl_list = cl;
3192 cl->length = gfc_copy_expr (old_cl->length);
3193 cl->length_from_typespec = old_cl->length_from_typespec;
3194 cl->backend_decl = old_cl->backend_decl;
3195 cl->passed_length = old_cl->passed_length;
3196 cl->resolved = old_cl->resolved;
3200 /* Put into namespace. */
3201 cl->next = ns->cl_list;
3209 /* Free the charlen list from cl to end (end is not freed).
3210 Free the whole list if end is NULL. */
3213 gfc_free_charlen (gfc_charlen *cl, gfc_charlen *end)
3217 for (; cl != end; cl = cl2)
3222 gfc_free_expr (cl->length);
3228 /* Free entry list structs. */
3231 free_entry_list (gfc_entry_list *el)
3233 gfc_entry_list *next;
3240 free_entry_list (next);
3244 /* Free a namespace structure and everything below it. Interface
3245 lists associated with intrinsic operators are not freed. These are
3246 taken care of when a specific name is freed. */
3249 gfc_free_namespace (gfc_namespace *ns)
3251 gfc_namespace *p, *q;
3260 gcc_assert (ns->refs == 0);
3262 gfc_free_statements (ns->code);
3264 free_sym_tree (ns->sym_root);
3265 free_uop_tree (ns->uop_root);
3266 free_common_tree (ns->common_root);
3267 free_tb_tree (ns->tb_sym_root);
3268 free_tb_tree (ns->tb_uop_root);
3269 gfc_free_finalizer_list (ns->finalizers);
3270 gfc_free_charlen (ns->cl_list, NULL);
3271 free_st_labels (ns->st_labels);
3273 free_entry_list (ns->entries);
3274 gfc_free_equiv (ns->equiv);
3275 gfc_free_equiv_lists (ns->equiv_lists);
3276 gfc_free_use_stmts (ns->use_stmts);
3278 for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++)
3279 gfc_free_interface (ns->op[i]);
3281 gfc_free_data (ns->data);
3285 /* Recursively free any contained namespaces. */
3290 gfc_free_namespace (q);
3296 gfc_symbol_init_2 (void)
3299 gfc_current_ns = gfc_get_namespace (NULL, 0);
3304 gfc_symbol_done_2 (void)
3307 gfc_free_namespace (gfc_current_ns);
3308 gfc_current_ns = NULL;
3309 gfc_free_dt_list ();
3313 /* Clear mark bits from symbol nodes associated with a symtree node. */
3316 clear_sym_mark (gfc_symtree *st)
3319 st->n.sym->mark = 0;
3323 /* Recursively traverse the symtree nodes. */
3326 gfc_traverse_symtree (gfc_symtree *st, void (*func) (gfc_symtree *))
3331 gfc_traverse_symtree (st->left, func);
3333 gfc_traverse_symtree (st->right, func);
3337 /* Recursive namespace traversal function. */
3340 traverse_ns (gfc_symtree *st, void (*func) (gfc_symbol *))
3346 traverse_ns (st->left, func);
3348 if (st->n.sym->mark == 0)
3349 (*func) (st->n.sym);
3350 st->n.sym->mark = 1;
3352 traverse_ns (st->right, func);
3356 /* Call a given function for all symbols in the namespace. We take
3357 care that each gfc_symbol node is called exactly once. */
3360 gfc_traverse_ns (gfc_namespace *ns, void (*func) (gfc_symbol *))
3363 gfc_traverse_symtree (ns->sym_root, clear_sym_mark);
3365 traverse_ns (ns->sym_root, func);
3369 /* Return TRUE when name is the name of an intrinsic type. */
3372 gfc_is_intrinsic_typename (const char *name)
3374 if (strcmp (name, "integer") == 0
3375 || strcmp (name, "real") == 0
3376 || strcmp (name, "character") == 0
3377 || strcmp (name, "logical") == 0
3378 || strcmp (name, "complex") == 0
3379 || strcmp (name, "doubleprecision") == 0
3380 || strcmp (name, "doublecomplex") == 0)
3387 /* Return TRUE if the symbol is an automatic variable. */
3390 gfc_is_var_automatic (gfc_symbol *sym)
3392 /* Pointer and allocatable variables are never automatic. */
3393 if (sym->attr.pointer || sym->attr.allocatable)
3395 /* Check for arrays with non-constant size. */
3396 if (sym->attr.dimension && sym->as
3397 && !gfc_is_compile_time_shape (sym->as))
3399 /* Check for non-constant length character variables. */
3400 if (sym->ts.type == BT_CHARACTER
3402 && !gfc_is_constant_expr (sym->ts.u.cl->length))
3407 /* Given a symbol, mark it as SAVEd if it is allowed. */
3410 save_symbol (gfc_symbol *sym)
3413 if (sym->attr.use_assoc)
3416 if (sym->attr.in_common
3419 || sym->attr.flavor != FL_VARIABLE)
3421 /* Automatic objects are not saved. */
3422 if (gfc_is_var_automatic (sym))
3424 gfc_add_save (&sym->attr, SAVE_EXPLICIT, sym->name, &sym->declared_at);
3428 /* Mark those symbols which can be SAVEd as such. */
3431 gfc_save_all (gfc_namespace *ns)
3433 gfc_traverse_ns (ns, save_symbol);
3437 /* Make sure that no changes to symbols are pending. */
3440 gfc_enforce_clean_symbol_state(void)
3442 gcc_assert (changed_syms == NULL);
3446 /************** Global symbol handling ************/
3449 /* Search a tree for the global symbol. */
3452 gfc_find_gsymbol (gfc_gsymbol *symbol, const char *name)
3461 c = strcmp (name, symbol->name);
3465 symbol = (c < 0) ? symbol->left : symbol->right;
3472 /* Compare two global symbols. Used for managing the BB tree. */
3475 gsym_compare (void *_s1, void *_s2)
3477 gfc_gsymbol *s1, *s2;
3479 s1 = (gfc_gsymbol *) _s1;
3480 s2 = (gfc_gsymbol *) _s2;
3481 return strcmp (s1->name, s2->name);
3485 /* Get a global symbol, creating it if it doesn't exist. */
3488 gfc_get_gsymbol (const char *name)
3492 s = gfc_find_gsymbol (gfc_gsym_root, name);
3496 s = XCNEW (gfc_gsymbol);
3497 s->type = GSYM_UNKNOWN;
3498 s->name = gfc_get_string (name);
3500 gfc_insert_bbt (&gfc_gsym_root, s, gsym_compare);
3507 get_iso_c_binding_dt (int sym_id)
3509 gfc_dt_list *dt_list;
3511 dt_list = gfc_derived_types;
3513 /* Loop through the derived types in the name list, searching for
3514 the desired symbol from iso_c_binding. Search the parent namespaces
3515 if necessary and requested to (parent_flag). */
3516 while (dt_list != NULL)
3518 if (dt_list->derived->from_intmod != INTMOD_NONE
3519 && dt_list->derived->intmod_sym_id == sym_id)
3520 return dt_list->derived;
3522 dt_list = dt_list->next;
3529 /* Verifies that the given derived type symbol, derived_sym, is interoperable
3530 with C. This is necessary for any derived type that is BIND(C) and for
3531 derived types that are parameters to functions that are BIND(C). All
3532 fields of the derived type are required to be interoperable, and are tested
3533 for such. If an error occurs, the errors are reported here, allowing for
3534 multiple errors to be handled for a single derived type. */
3537 verify_bind_c_derived_type (gfc_symbol *derived_sym)
3539 gfc_component *curr_comp = NULL;
3540 gfc_try is_c_interop = FAILURE;
3541 gfc_try retval = SUCCESS;
3543 if (derived_sym == NULL)
3544 gfc_internal_error ("verify_bind_c_derived_type(): Given symbol is "
3545 "unexpectedly NULL");
3547 /* If we've already looked at this derived symbol, do not look at it again
3548 so we don't repeat warnings/errors. */
3549 if (derived_sym->ts.is_c_interop)
3552 /* The derived type must have the BIND attribute to be interoperable
3553 J3/04-007, Section 15.2.3. */
3554 if (derived_sym->attr.is_bind_c != 1)
3556 derived_sym->ts.is_c_interop = 0;
3557 gfc_error_now ("Derived type '%s' declared at %L must have the BIND "
3558 "attribute to be C interoperable", derived_sym->name,
3559 &(derived_sym->declared_at));
3563 curr_comp = derived_sym->components;
3565 /* Fortran 2003 allows an empty derived type. C99 appears to disallow an
3566 empty struct. Section 15.2 in Fortran 2003 states: "The following
3567 subclauses define the conditions under which a Fortran entity is
3568 interoperable. If a Fortran entity is interoperable, an equivalent
3569 entity may be defined by means of C and the Fortran entity is said
3570 to be interoperable with the C entity. There does not have to be such
3571 an interoperating C entity."
3573 if (curr_comp == NULL)
3575 gfc_warning ("Derived type '%s' with BIND(C) attribute at %L is empty, "
3576 "and may be inaccessible by the C companion processor",
3577 derived_sym->name, &(derived_sym->declared_at));
3578 derived_sym->ts.is_c_interop = 1;
3579 derived_sym->attr.is_bind_c = 1;
3584 /* Initialize the derived type as being C interoperable.
3585 If we find an error in the components, this will be set false. */
3586 derived_sym->ts.is_c_interop = 1;
3588 /* Loop through the list of components to verify that the kind of
3589 each is a C interoperable type. */
3592 /* The components cannot be pointers (fortran sense).
3593 J3/04-007, Section 15.2.3, C1505. */
3594 if (curr_comp->attr.pointer != 0)
3596 gfc_error ("Component '%s' at %L cannot have the "
3597 "POINTER attribute because it is a member "
3598 "of the BIND(C) derived type '%s' at %L",
3599 curr_comp->name, &(curr_comp->loc),
3600 derived_sym->name, &(derived_sym->declared_at));
3604 if (curr_comp->attr.proc_pointer != 0)
3606 gfc_error ("Procedure pointer component '%s' at %L cannot be a member"
3607 " of the BIND(C) derived type '%s' at %L", curr_comp->name,
3608 &curr_comp->loc, derived_sym->name,
3609 &derived_sym->declared_at);
3613 /* The components cannot be allocatable.
3614 J3/04-007, Section 15.2.3, C1505. */
3615 if (curr_comp->attr.allocatable != 0)
3617 gfc_error ("Component '%s' at %L cannot have the "
3618 "ALLOCATABLE attribute because it is a member "
3619 "of the BIND(C) derived type '%s' at %L",
3620 curr_comp->name, &(curr_comp->loc),
3621 derived_sym->name, &(derived_sym->declared_at));
3625 /* BIND(C) derived types must have interoperable components. */
3626 if (curr_comp->ts.type == BT_DERIVED
3627 && curr_comp->ts.u.derived->ts.is_iso_c != 1
3628 && curr_comp->ts.u.derived != derived_sym)
3630 /* This should be allowed; the draft says a derived-type can not
3631 have type parameters if it is has the BIND attribute. Type
3632 parameters seem to be for making parameterized derived types.
3633 There's no need to verify the type if it is c_ptr/c_funptr. */
3634 retval = verify_bind_c_derived_type (curr_comp->ts.u.derived);
3638 /* Grab the typespec for the given component and test the kind. */
3639 is_c_interop = gfc_verify_c_interop (&(curr_comp->ts));
3641 if (is_c_interop != SUCCESS)
3643 /* Report warning and continue since not fatal. The
3644 draft does specify a constraint that requires all fields
3645 to interoperate, but if the user says real(4), etc., it
3646 may interoperate with *something* in C, but the compiler
3647 most likely won't know exactly what. Further, it may not
3648 interoperate with the same data type(s) in C if the user
3649 recompiles with different flags (e.g., -m32 and -m64 on
3650 x86_64 and using integer(4) to claim interop with a
3652 if (derived_sym->attr.is_bind_c == 1)
3653 /* If the derived type is bind(c), all fields must be
3655 gfc_warning ("Component '%s' in derived type '%s' at %L "
3656 "may not be C interoperable, even though "
3657 "derived type '%s' is BIND(C)",
3658 curr_comp->name, derived_sym->name,
3659 &(curr_comp->loc), derived_sym->name);
3661 /* If derived type is param to bind(c) routine, or to one
3662 of the iso_c_binding procs, it must be interoperable, so
3663 all fields must interop too. */
3664 gfc_warning ("Component '%s' in derived type '%s' at %L "
3665 "may not be C interoperable",
3666 curr_comp->name, derived_sym->name,
3671 curr_comp = curr_comp->next;
3672 } while (curr_comp != NULL);
3675 /* Make sure we don't have conflicts with the attributes. */
3676 if (derived_sym->attr.access == ACCESS_PRIVATE)
3678 gfc_error ("Derived type '%s' at %L cannot be declared with both "
3679 "PRIVATE and BIND(C) attributes", derived_sym->name,
3680 &(derived_sym->declared_at));
3684 if (derived_sym->attr.sequence != 0)
3686 gfc_error ("Derived type '%s' at %L cannot have the SEQUENCE "
3687 "attribute because it is BIND(C)", derived_sym->name,
3688 &(derived_sym->declared_at));
3692 /* Mark the derived type as not being C interoperable if we found an
3693 error. If there were only warnings, proceed with the assumption
3694 it's interoperable. */
3695 if (retval == FAILURE)
3696 derived_sym->ts.is_c_interop = 0;
3702 /* Generate symbols for the named constants c_null_ptr and c_null_funptr. */
3705 gen_special_c_interop_ptr (int ptr_id, const char *ptr_name,
3706 const char *module_name)
3708 gfc_symtree *tmp_symtree;
3709 gfc_symbol *tmp_sym;
3712 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, ptr_name);
3714 if (tmp_symtree != NULL)
3715 tmp_sym = tmp_symtree->n.sym;
3719 gfc_internal_error ("gen_special_c_interop_ptr(): Unable to "
3720 "create symbol for %s", ptr_name);
3723 /* Set up the symbol's important fields. Save attr required so we can
3724 initialize the ptr to NULL. */
3725 tmp_sym->attr.save = SAVE_EXPLICIT;
3726 tmp_sym->ts.is_c_interop = 1;
3727 tmp_sym->attr.is_c_interop = 1;
3728 tmp_sym->ts.is_iso_c = 1;
3729 tmp_sym->ts.type = BT_DERIVED;
3731 /* The c_ptr and c_funptr derived types will provide the
3732 definition for c_null_ptr and c_null_funptr, respectively. */
3733 if (ptr_id == ISOCBINDING_NULL_PTR)
3734 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_PTR);
3736 tmp_sym->ts.u.derived = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3737 if (tmp_sym->ts.u.derived == NULL)
3739 /* This can occur if the user forgot to declare c_ptr or
3740 c_funptr and they're trying to use one of the procedures
3741 that has arg(s) of the missing type. In this case, a
3742 regular version of the thing should have been put in the
3744 generate_isocbinding_symbol (module_name, ptr_id == ISOCBINDING_NULL_PTR
3745 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR,
3746 (const char *) (ptr_id == ISOCBINDING_NULL_PTR
3747 ? "_gfortran_iso_c_binding_c_ptr"
3748 : "_gfortran_iso_c_binding_c_funptr"));
3750 tmp_sym->ts.u.derived =
3751 get_iso_c_binding_dt (ptr_id == ISOCBINDING_NULL_PTR
3752 ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR);
3755 /* Module name is some mangled version of iso_c_binding. */
3756 tmp_sym->module = gfc_get_string (module_name);
3758 /* Say it's from the iso_c_binding module. */
3759 tmp_sym->attr.is_iso_c = 1;
3761 tmp_sym->attr.use_assoc = 1;
3762 tmp_sym->attr.is_bind_c = 1;
3763 /* Set the binding_label. */
3764 sprintf (tmp_sym->binding_label, "%s_%s", module_name, tmp_sym->name);
3766 /* Set the c_address field of c_null_ptr and c_null_funptr to
3767 the value of NULL. */
3768 tmp_sym->value = gfc_get_expr ();
3769 tmp_sym->value->expr_type = EXPR_STRUCTURE;
3770 tmp_sym->value->ts.type = BT_DERIVED;
3771 tmp_sym->value->ts.u.derived = tmp_sym->ts.u.derived;
3772 gfc_constructor_append_expr (&tmp_sym->value->value.constructor, NULL, NULL);
3773 c = gfc_constructor_first (tmp_sym->value->value.constructor);
3774 c->expr = gfc_get_expr ();
3775 c->expr->expr_type = EXPR_NULL;
3776 c->expr->ts.is_iso_c = 1;
3777 /* Must declare c_null_ptr and c_null_funptr as having the
3778 PARAMETER attribute so they can be used in init expressions. */
3779 tmp_sym->attr.flavor = FL_PARAMETER;
3785 /* Add a formal argument, gfc_formal_arglist, to the
3786 end of the given list of arguments. Set the reference to the
3787 provided symbol, param_sym, in the argument. */
3790 add_formal_arg (gfc_formal_arglist **head,
3791 gfc_formal_arglist **tail,
3792 gfc_formal_arglist *formal_arg,
3793 gfc_symbol *param_sym)
3795 /* Put in list, either as first arg or at the tail (curr arg). */
3797 *head = *tail = formal_arg;
3800 (*tail)->next = formal_arg;
3801 (*tail) = formal_arg;
3804 (*tail)->sym = param_sym;
3805 (*tail)->next = NULL;
3811 /* Generates a symbol representing the CPTR argument to an
3812 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3813 CPTR and add it to the provided argument list. */
3816 gen_cptr_param (gfc_formal_arglist **head,
3817 gfc_formal_arglist **tail,
3818 const char *module_name,
3819 gfc_namespace *ns, const char *c_ptr_name,
3822 gfc_symbol *param_sym = NULL;
3823 gfc_symbol *c_ptr_sym = NULL;
3824 gfc_symtree *param_symtree = NULL;
3825 gfc_formal_arglist *formal_arg = NULL;
3826 const char *c_ptr_in;
3827 const char *c_ptr_type = NULL;
3829 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3830 c_ptr_type = "_gfortran_iso_c_binding_c_funptr";
3832 c_ptr_type = "_gfortran_iso_c_binding_c_ptr";
3834 if(c_ptr_name == NULL)
3835 c_ptr_in = "gfc_cptr__";
3837 c_ptr_in = c_ptr_name;
3838 gfc_get_sym_tree (c_ptr_in, ns, ¶m_symtree, false);
3839 if (param_symtree != NULL)
3840 param_sym = param_symtree->n.sym;
3842 gfc_internal_error ("gen_cptr_param(): Unable to "
3843 "create symbol for %s", c_ptr_in);
3845 /* Set up the appropriate fields for the new c_ptr param sym. */
3847 param_sym->attr.flavor = FL_DERIVED;
3848 param_sym->ts.type = BT_DERIVED;
3849 param_sym->attr.intent = INTENT_IN;
3850 param_sym->attr.dummy = 1;
3852 /* This will pass the ptr to the iso_c routines as a (void *). */
3853 param_sym->attr.value = 1;
3854 param_sym->attr.use_assoc = 1;
3856 /* Get the symbol for c_ptr or c_funptr, no matter what it's name is
3858 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3859 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
3861 c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_PTR);
3862 if (c_ptr_sym == NULL)
3864 /* This can happen if the user did not define c_ptr but they are
3865 trying to use one of the iso_c_binding functions that need it. */
3866 if (iso_c_sym_id == ISOCBINDING_F_PROCPOINTER)
3867 generate_isocbinding_symbol (module_name, ISOCBINDING_FUNPTR,
3868 (const char *)c_ptr_type);
3870 generate_isocbinding_symbol (module_name, ISOCBINDING_PTR,
3871 (const char *)c_ptr_type);
3873 gfc_get_ha_symbol (c_ptr_type, &(c_ptr_sym));
3876 param_sym->ts.u.derived = c_ptr_sym;
3877 param_sym->module = gfc_get_string (module_name);
3879 /* Make new formal arg. */
3880 formal_arg = gfc_get_formal_arglist ();
3881 /* Add arg to list of formal args (the CPTR arg). */
3882 add_formal_arg (head, tail, formal_arg, param_sym);
3884 /* Validate changes. */
3885 gfc_commit_symbol (param_sym);
3889 /* Generates a symbol representing the FPTR argument to an
3890 iso_c_binding procedure. Also, create a gfc_formal_arglist for the
3891 FPTR and add it to the provided argument list. */
3894 gen_fptr_param (gfc_formal_arglist **head,
3895 gfc_formal_arglist **tail,
3896 const char *module_name,
3897 gfc_namespace *ns, const char *f_ptr_name, int proc)
3899 gfc_symbol *param_sym = NULL;
3900 gfc_symtree *param_symtree = NULL;
3901 gfc_formal_arglist *formal_arg = NULL;
3902 const char *f_ptr_out = "gfc_fptr__";
3904 if (f_ptr_name != NULL)
3905 f_ptr_out = f_ptr_name;
3907 gfc_get_sym_tree (f_ptr_out, ns, ¶m_symtree, false);
3908 if (param_symtree != NULL)
3909 param_sym = param_symtree->n.sym;
3911 gfc_internal_error ("generateFPtrParam(): Unable to "
3912 "create symbol for %s", f_ptr_out);
3914 /* Set up the necessary fields for the fptr output param sym. */
3917 param_sym->attr.proc_pointer = 1;
3919 param_sym->attr.pointer = 1;
3920 param_sym->attr.dummy = 1;
3921 param_sym->attr.use_assoc = 1;
3923 /* ISO C Binding type to allow any pointer type as actual param. */
3924 param_sym->ts.type = BT_VOID;
3925 param_sym->module = gfc_get_string (module_name);
3928 formal_arg = gfc_get_formal_arglist ();
3929 /* Add arg to list of formal args. */
3930 add_formal_arg (head, tail, formal_arg, param_sym);
3932 /* Validate changes. */
3933 gfc_commit_symbol (param_sym);
3937 /* Generates a symbol representing the optional SHAPE argument for the
3938 iso_c_binding c_f_pointer() procedure. Also, create a
3939 gfc_formal_arglist for the SHAPE and add it to the provided
3943 gen_shape_param (gfc_formal_arglist **head,
3944 gfc_formal_arglist **tail,
3945 const char *module_name,
3946 gfc_namespace *ns, const char *shape_param_name)
3948 gfc_symbol *param_sym = NULL;
3949 gfc_symtree *param_symtree = NULL;
3950 gfc_formal_arglist *formal_arg = NULL;
3951 const char *shape_param = "gfc_shape_array__";
3953 if (shape_param_name != NULL)
3954 shape_param = shape_param_name;
3956 gfc_get_sym_tree (shape_param, ns, ¶m_symtree, false);
3957 if (param_symtree != NULL)
3958 param_sym = param_symtree->n.sym;
3960 gfc_internal_error ("generateShapeParam(): Unable to "
3961 "create symbol for %s", shape_param);
3963 /* Set up the necessary fields for the shape input param sym. */
3965 param_sym->attr.dummy = 1;
3966 param_sym->attr.use_assoc = 1;
3968 /* Integer array, rank 1, describing the shape of the object. Make it's
3969 type BT_VOID initially so we can accept any type/kind combination of
3970 integer. During gfc_iso_c_sub_interface (resolve.c), we'll make it
3971 of BT_INTEGER type. */
3972 param_sym->ts.type = BT_VOID;
3974 /* Initialize the kind to default integer. However, it will be overridden
3975 during resolution to match the kind of the SHAPE parameter given as
3976 the actual argument (to allow for any valid integer kind). */
3977 param_sym->ts.kind = gfc_default_integer_kind;
3978 param_sym->as = gfc_get_array_spec ();
3980 param_sym->as->rank = 1;
3981 param_sym->as->lower[0] = gfc_get_int_expr (gfc_default_integer_kind,
3984 /* The extent is unknown until we get it. The length give us
3985 the rank the incoming pointer. */
3986 param_sym->as->type = AS_ASSUMED_SHAPE;
3988 /* The arg is also optional; it is required iff the second arg
3989 (fptr) is to an array, otherwise, it's ignored. */
3990 param_sym->attr.optional = 1;
3991 param_sym->attr.intent = INTENT_IN;
3992 param_sym->attr.dimension = 1;
3993 param_sym->module = gfc_get_string (module_name);
3996 formal_arg = gfc_get_formal_arglist ();
3997 /* Add arg to list of formal args. */
3998 add_formal_arg (head, tail, formal_arg, param_sym);
4000 /* Validate changes. */
4001 gfc_commit_symbol (param_sym);
4005 /* Add a procedure interface to the given symbol (i.e., store a
4006 reference to the list of formal arguments). */
4009 add_proc_interface (gfc_symbol *sym, ifsrc source,
4010 gfc_formal_arglist *formal)
4013 sym->formal = formal;
4014 sym->attr.if_source = source;
4018 /* Copy the formal args from an existing symbol, src, into a new
4019 symbol, dest. New formal args are created, and the description of
4020 each arg is set according to the existing ones. This function is
4021 used when creating procedure declaration variables from a procedure
4022 declaration statement (see match_proc_decl()) to create the formal
4023 args based on the args of a given named interface. */
4026 gfc_copy_formal_args (gfc_symbol *dest, gfc_symbol *src)
4028 gfc_formal_arglist *head = NULL;
4029 gfc_formal_arglist *tail = NULL;
4030 gfc_formal_arglist *formal_arg = NULL;
4031 gfc_formal_arglist *curr_arg = NULL;
4032 gfc_formal_arglist *formal_prev = NULL;
4033 /* Save current namespace so we can change it for formal args. */
4034 gfc_namespace *parent_ns = gfc_current_ns;
4036 /* Create a new namespace, which will be the formal ns (namespace
4037 of the formal args). */
4038 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4039 gfc_current_ns->proc_name = dest;
4041 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4043 formal_arg = gfc_get_formal_arglist ();
4044 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4046 /* May need to copy more info for the symbol. */
4047 formal_arg->sym->attr = curr_arg->sym->attr;
4048 formal_arg->sym->ts = curr_arg->sym->ts;
4049 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4050 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
4052 /* If this isn't the first arg, set up the next ptr. For the
4053 last arg built, the formal_arg->next will never get set to
4054 anything other than NULL. */
4055 if (formal_prev != NULL)
4056 formal_prev->next = formal_arg;
4058 formal_arg->next = NULL;
4060 formal_prev = formal_arg;
4062 /* Add arg to list of formal args. */
4063 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4065 /* Validate changes. */
4066 gfc_commit_symbol (formal_arg->sym);
4069 /* Add the interface to the symbol. */
4070 add_proc_interface (dest, IFSRC_DECL, head);
4072 /* Store the formal namespace information. */
4073 if (dest->formal != NULL)
4074 /* The current ns should be that for the dest proc. */
4075 dest->formal_ns = gfc_current_ns;
4076 /* Restore the current namespace to what it was on entry. */
4077 gfc_current_ns = parent_ns;
4082 gfc_copy_formal_args_intr (gfc_symbol *dest, gfc_intrinsic_sym *src)
4084 gfc_formal_arglist *head = NULL;
4085 gfc_formal_arglist *tail = NULL;
4086 gfc_formal_arglist *formal_arg = NULL;
4087 gfc_intrinsic_arg *curr_arg = NULL;
4088 gfc_formal_arglist *formal_prev = NULL;
4089 /* Save current namespace so we can change it for formal args. */
4090 gfc_namespace *parent_ns = gfc_current_ns;
4092 /* Create a new namespace, which will be the formal ns (namespace
4093 of the formal args). */
4094 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4095 gfc_current_ns->proc_name = dest;
4097 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4099 formal_arg = gfc_get_formal_arglist ();
4100 gfc_get_symbol (curr_arg->name, gfc_current_ns, &(formal_arg->sym));
4102 /* May need to copy more info for the symbol. */
4103 formal_arg->sym->ts = curr_arg->ts;
4104 formal_arg->sym->attr.optional = curr_arg->optional;
4105 formal_arg->sym->attr.value = curr_arg->value;
4106 formal_arg->sym->attr.intent = curr_arg->intent;
4107 formal_arg->sym->attr.flavor = FL_VARIABLE;
4108 formal_arg->sym->attr.dummy = 1;
4110 if (formal_arg->sym->ts.type == BT_CHARACTER)
4111 formal_arg->sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4113 /* If this isn't the first arg, set up the next ptr. For the
4114 last arg built, the formal_arg->next will never get set to
4115 anything other than NULL. */
4116 if (formal_prev != NULL)
4117 formal_prev->next = formal_arg;
4119 formal_arg->next = NULL;
4121 formal_prev = formal_arg;
4123 /* Add arg to list of formal args. */
4124 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4126 /* Validate changes. */
4127 gfc_commit_symbol (formal_arg->sym);
4130 /* Add the interface to the symbol. */
4131 add_proc_interface (dest, IFSRC_DECL, head);
4133 /* Store the formal namespace information. */
4134 if (dest->formal != NULL)
4135 /* The current ns should be that for the dest proc. */
4136 dest->formal_ns = gfc_current_ns;
4137 /* Restore the current namespace to what it was on entry. */
4138 gfc_current_ns = parent_ns;
4143 gfc_copy_formal_args_ppc (gfc_component *dest, gfc_symbol *src)
4145 gfc_formal_arglist *head = NULL;
4146 gfc_formal_arglist *tail = NULL;
4147 gfc_formal_arglist *formal_arg = NULL;
4148 gfc_formal_arglist *curr_arg = NULL;
4149 gfc_formal_arglist *formal_prev = NULL;
4150 /* Save current namespace so we can change it for formal args. */
4151 gfc_namespace *parent_ns = gfc_current_ns;
4153 /* Create a new namespace, which will be the formal ns (namespace
4154 of the formal args). */
4155 gfc_current_ns = gfc_get_namespace (parent_ns, 0);
4156 /* TODO: gfc_current_ns->proc_name = dest;*/
4158 for (curr_arg = src->formal; curr_arg; curr_arg = curr_arg->next)
4160 formal_arg = gfc_get_formal_arglist ();
4161 gfc_get_symbol (curr_arg->sym->name, gfc_current_ns, &(formal_arg->sym));
4163 /* May need to copy more info for the symbol. */
4164 formal_arg->sym->attr = curr_arg->sym->attr;
4165 formal_arg->sym->ts = curr_arg->sym->ts;
4166 formal_arg->sym->as = gfc_copy_array_spec (curr_arg->sym->as);
4167 gfc_copy_formal_args (formal_arg->sym, curr_arg->sym);
4169 /* If this isn't the first arg, set up the next ptr. For the
4170 last arg built, the formal_arg->next will never get set to
4171 anything other than NULL. */
4172 if (formal_prev != NULL)
4173 formal_prev->next = formal_arg;
4175 formal_arg->next = NULL;
4177 formal_prev = formal_arg;
4179 /* Add arg to list of formal args. */
4180 add_formal_arg (&head, &tail, formal_arg, formal_arg->sym);
4182 /* Validate changes. */
4183 gfc_commit_symbol (formal_arg->sym);
4186 /* Add the interface to the symbol. */
4187 gfc_free_formal_arglist (dest->formal);
4188 dest->formal = head;
4189 dest->attr.if_source = IFSRC_DECL;
4191 /* Store the formal namespace information. */
4192 if (dest->formal != NULL)
4193 /* The current ns should be that for the dest proc. */
4194 dest->formal_ns = gfc_current_ns;
4195 /* Restore the current namespace to what it was on entry. */
4196 gfc_current_ns = parent_ns;
4200 /* Builds the parameter list for the iso_c_binding procedure
4201 c_f_pointer or c_f_procpointer. The old_sym typically refers to a
4202 generic version of either the c_f_pointer or c_f_procpointer
4203 functions. The new_proc_sym represents a "resolved" version of the
4204 symbol. The functions are resolved to match the types of their
4205 parameters; for example, c_f_pointer(cptr, fptr) would resolve to
4206 something similar to c_f_pointer_i4 if the type of data object fptr
4207 pointed to was a default integer. The actual name of the resolved
4208 procedure symbol is further mangled with the module name, etc., but
4209 the idea holds true. */
4212 build_formal_args (gfc_symbol *new_proc_sym,
4213 gfc_symbol *old_sym, int add_optional_arg)
4215 gfc_formal_arglist *head = NULL, *tail = NULL;
4216 gfc_namespace *parent_ns = NULL;
4218 parent_ns = gfc_current_ns;
4219 /* Create a new namespace, which will be the formal ns (namespace
4220 of the formal args). */
4221 gfc_current_ns = gfc_get_namespace(parent_ns, 0);
4222 gfc_current_ns->proc_name = new_proc_sym;
4224 /* Generate the params. */
4225 if (old_sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER)
4227 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4228 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4229 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4230 gfc_current_ns, "fptr", 1);
4232 else if (old_sym->intmod_sym_id == ISOCBINDING_F_POINTER)
4234 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4235 gfc_current_ns, "cptr", old_sym->intmod_sym_id);
4236 gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module,
4237 gfc_current_ns, "fptr", 0);
4238 /* If we're dealing with c_f_pointer, it has an optional third arg. */
4239 gen_shape_param (&head, &tail,(const char *) new_proc_sym->module,
4240 gfc_current_ns, "shape");
4243 else if (old_sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
4245 /* c_associated has one required arg and one optional; both
4247 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4248 gfc_current_ns, "c_ptr_1", ISOCBINDING_ASSOCIATED);
4249 if (add_optional_arg)
4251 gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module,
4252 gfc_current_ns, "c_ptr_2", ISOCBINDING_ASSOCIATED);
4253 /* The last param is optional so mark it as such. */
4254 tail->sym->attr.optional = 1;
4258 /* Add the interface (store formal args to new_proc_sym). */
4259 add_proc_interface (new_proc_sym, IFSRC_DECL, head);
4261 /* Set up the formal_ns pointer to the one created for the
4262 new procedure so it'll get cleaned up during gfc_free_symbol(). */
4263 new_proc_sym->formal_ns = gfc_current_ns;
4265 gfc_current_ns = parent_ns;
4269 std_for_isocbinding_symbol (int id)
4273 #define NAMED_INTCST(a,b,c,d) \
4276 #include "iso-c-binding.def"
4279 #define NAMED_FUNCTION(a,b,c,d) \
4282 #include "iso-c-binding.def"
4283 #undef NAMED_FUNCTION
4286 return GFC_STD_F2003;
4290 /* Generate the given set of C interoperable kind objects, or all
4291 interoperable kinds. This function will only be given kind objects
4292 for valid iso_c_binding defined types because this is verified when
4293 the 'use' statement is parsed. If the user gives an 'only' clause,
4294 the specific kinds are looked up; if they don't exist, an error is
4295 reported. If the user does not give an 'only' clause, all
4296 iso_c_binding symbols are generated. If a list of specific kinds
4297 is given, it must have a NULL in the first empty spot to mark the
4302 generate_isocbinding_symbol (const char *mod_name, iso_c_binding_symbol s,
4303 const char *local_name)
4305 const char *const name = (local_name && local_name[0]) ? local_name
4306 : c_interop_kinds_table[s].name;
4307 gfc_symtree *tmp_symtree = NULL;
4308 gfc_symbol *tmp_sym = NULL;
4309 gfc_dt_list **dt_list_ptr = NULL;
4310 gfc_component *tmp_comp = NULL;
4311 char comp_name[(GFC_MAX_SYMBOL_LEN * 2) + 1];
4314 if (gfc_notification_std (std_for_isocbinding_symbol (s)) == ERROR)
4316 tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, name);
4318 /* Already exists in this scope so don't re-add it.
4319 TODO: we should probably check that it's really the same symbol. */
4320 if (tmp_symtree != NULL)
4323 /* Create the sym tree in the current ns. */
4324 gfc_get_sym_tree (name, gfc_current_ns, &tmp_symtree, false);
4326 tmp_sym = tmp_symtree->n.sym;
4328 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4331 /* Say what module this symbol belongs to. */
4332 tmp_sym->module = gfc_get_string (mod_name);
4333 tmp_sym->from_intmod = INTMOD_ISO_C_BINDING;
4334 tmp_sym->intmod_sym_id = s;
4339 #define NAMED_INTCST(a,b,c,d) case a :
4340 #define NAMED_REALCST(a,b,c,d) case a :
4341 #define NAMED_CMPXCST(a,b,c,d) case a :
4342 #define NAMED_LOGCST(a,b,c) case a :
4343 #define NAMED_CHARKNDCST(a,b,c) case a :
4344 #include "iso-c-binding.def"
4346 tmp_sym->value = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4347 c_interop_kinds_table[s].value);
4349 /* Initialize an integer constant expression node. */
4350 tmp_sym->attr.flavor = FL_PARAMETER;
4351 tmp_sym->ts.type = BT_INTEGER;
4352 tmp_sym->ts.kind = gfc_default_integer_kind;
4354 /* Mark this type as a C interoperable one. */
4355 tmp_sym->ts.is_c_interop = 1;
4356 tmp_sym->ts.is_iso_c = 1;
4357 tmp_sym->value->ts.is_c_interop = 1;
4358 tmp_sym->value->ts.is_iso_c = 1;
4359 tmp_sym->attr.is_c_interop = 1;
4361 /* Tell what f90 type this c interop kind is valid. */
4362 tmp_sym->ts.f90_type = c_interop_kinds_table[s].f90_type;
4364 /* Say it's from the iso_c_binding module. */
4365 tmp_sym->attr.is_iso_c = 1;
4367 /* Make it use associated. */
4368 tmp_sym->attr.use_assoc = 1;
4372 #define NAMED_CHARCST(a,b,c) case a :
4373 #include "iso-c-binding.def"
4375 /* Initialize an integer constant expression node for the
4376 length of the character. */
4377 tmp_sym->value = gfc_get_character_expr (gfc_default_character_kind,
4378 &gfc_current_locus, NULL, 1);
4379 tmp_sym->value->ts.is_c_interop = 1;
4380 tmp_sym->value->ts.is_iso_c = 1;
4381 tmp_sym->value->value.character.length = 1;
4382 tmp_sym->value->value.character.string[0]
4383 = (gfc_char_t) c_interop_kinds_table[s].value;
4384 tmp_sym->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4385 tmp_sym->ts.u.cl->length = gfc_get_int_expr (gfc_default_integer_kind,
4388 /* May not need this in both attr and ts, but do need in
4389 attr for writing module file. */
4390 tmp_sym->attr.is_c_interop = 1;
4392 tmp_sym->attr.flavor = FL_PARAMETER;
4393 tmp_sym->ts.type = BT_CHARACTER;
4395 /* Need to set it to the C_CHAR kind. */
4396 tmp_sym->ts.kind = gfc_default_character_kind;
4398 /* Mark this type as a C interoperable one. */
4399 tmp_sym->ts.is_c_interop = 1;
4400 tmp_sym->ts.is_iso_c = 1;
4402 /* Tell what f90 type this c interop kind is valid. */
4403 tmp_sym->ts.f90_type = BT_CHARACTER;
4405 /* Say it's from the iso_c_binding module. */
4406 tmp_sym->attr.is_iso_c = 1;
4408 /* Make it use associated. */
4409 tmp_sym->attr.use_assoc = 1;
4412 case ISOCBINDING_PTR:
4413 case ISOCBINDING_FUNPTR:
4415 /* Initialize an integer constant expression node. */
4416 tmp_sym->attr.flavor = FL_DERIVED;
4417 tmp_sym->ts.is_c_interop = 1;
4418 tmp_sym->attr.is_c_interop = 1;
4419 tmp_sym->attr.is_iso_c = 1;
4420 tmp_sym->ts.is_iso_c = 1;
4421 tmp_sym->ts.type = BT_DERIVED;
4423 /* A derived type must have the bind attribute to be
4424 interoperable (J3/04-007, Section 15.2.3), even though
4425 the binding label is not used. */
4426 tmp_sym->attr.is_bind_c = 1;
4428 tmp_sym->attr.referenced = 1;
4430 tmp_sym->ts.u.derived = tmp_sym;
4432 /* Add the symbol created for the derived type to the current ns. */
4433 dt_list_ptr = &(gfc_derived_types);
4434 while (*dt_list_ptr != NULL && (*dt_list_ptr)->next != NULL)
4435 dt_list_ptr = &((*dt_list_ptr)->next);
4437 /* There is already at least one derived type in the list, so append
4438 the one we're currently building for c_ptr or c_funptr. */
4439 if (*dt_list_ptr != NULL)
4440 dt_list_ptr = &((*dt_list_ptr)->next);
4441 (*dt_list_ptr) = gfc_get_dt_list ();
4442 (*dt_list_ptr)->derived = tmp_sym;
4443 (*dt_list_ptr)->next = NULL;
4445 /* Set up the component of the derived type, which will be
4446 an integer with kind equal to c_ptr_size. Mangle the name of
4447 the field for the c_address to prevent the curious user from
4448 trying to access it from Fortran. */
4449 sprintf (comp_name, "__%s_%s", tmp_sym->name, "c_address");
4450 gfc_add_component (tmp_sym, comp_name, &tmp_comp);
4451 if (tmp_comp == NULL)
4452 gfc_internal_error ("generate_isocbinding_symbol(): Unable to "
4453 "create component for c_address");
4455 tmp_comp->ts.type = BT_INTEGER;
4457 /* Set this because the module will need to read/write this field. */
4458 tmp_comp->ts.f90_type = BT_INTEGER;
4460 /* The kinds for c_ptr and c_funptr are the same. */
4461 index = get_c_kind ("c_ptr", c_interop_kinds_table);
4462 tmp_comp->ts.kind = c_interop_kinds_table[index].value;
4464 tmp_comp->attr.pointer = 0;
4465 tmp_comp->attr.dimension = 0;
4467 /* Mark the component as C interoperable. */
4468 tmp_comp->ts.is_c_interop = 1;
4470 /* Make it use associated (iso_c_binding module). */
4471 tmp_sym->attr.use_assoc = 1;
4474 case ISOCBINDING_NULL_PTR:
4475 case ISOCBINDING_NULL_FUNPTR:
4476 gen_special_c_interop_ptr (s, name, mod_name);
4479 case ISOCBINDING_F_POINTER:
4480 case ISOCBINDING_ASSOCIATED:
4481 case ISOCBINDING_LOC:
4482 case ISOCBINDING_FUNLOC:
4483 case ISOCBINDING_F_PROCPOINTER:
4485 tmp_sym->attr.proc = PROC_MODULE;
4487 /* Use the procedure's name as it is in the iso_c_binding module for
4488 setting the binding label in case the user renamed the symbol. */
4489 sprintf (tmp_sym->binding_label, "%s_%s", mod_name,
4490 c_interop_kinds_table[s].name);
4491 tmp_sym->attr.is_iso_c = 1;
4492 if (s == ISOCBINDING_F_POINTER || s == ISOCBINDING_F_PROCPOINTER)
4493 tmp_sym->attr.subroutine = 1;
4496 /* TODO! This needs to be finished more for the expr of the
4497 function or something!
4498 This may not need to be here, because trying to do c_loc
4500 if (s == ISOCBINDING_ASSOCIATED)
4502 tmp_sym->attr.function = 1;
4503 tmp_sym->ts.type = BT_LOGICAL;
4504 tmp_sym->ts.kind = gfc_default_logical_kind;
4505 tmp_sym->result = tmp_sym;
4509 /* Here, we're taking the simple approach. We're defining
4510 c_loc as an external identifier so the compiler will put
4511 what we expect on the stack for the address we want the
4513 tmp_sym->ts.type = BT_DERIVED;
4514 if (s == ISOCBINDING_LOC)
4515 tmp_sym->ts.u.derived =
4516 get_iso_c_binding_dt (ISOCBINDING_PTR);
4518 tmp_sym->ts.u.derived =
4519 get_iso_c_binding_dt (ISOCBINDING_FUNPTR);
4521 if (tmp_sym->ts.u.derived == NULL)
4523 /* Create the necessary derived type so we can continue
4524 processing the file. */
4525 generate_isocbinding_symbol
4526 (mod_name, s == ISOCBINDING_FUNLOC
4527 ? ISOCBINDING_FUNPTR : ISOCBINDING_PTR,
4528 (const char *)(s == ISOCBINDING_FUNLOC
4529 ? "_gfortran_iso_c_binding_c_funptr"
4530 : "_gfortran_iso_c_binding_c_ptr"));
4531 tmp_sym->ts.u.derived =
4532 get_iso_c_binding_dt (s == ISOCBINDING_FUNLOC
4533 ? ISOCBINDING_FUNPTR
4537 /* The function result is itself (no result clause). */
4538 tmp_sym->result = tmp_sym;
4539 tmp_sym->attr.external = 1;
4540 tmp_sym->attr.use_assoc = 0;
4541 tmp_sym->attr.pure = 1;
4542 tmp_sym->attr.if_source = IFSRC_UNKNOWN;
4543 tmp_sym->attr.proc = PROC_UNKNOWN;
4547 tmp_sym->attr.flavor = FL_PROCEDURE;
4548 tmp_sym->attr.contained = 0;
4550 /* Try using this builder routine, with the new and old symbols
4551 both being the generic iso_c proc sym being created. This
4552 will create the formal args (and the new namespace for them).
4553 Don't build an arg list for c_loc because we're going to treat
4554 c_loc as an external procedure. */
4555 if (s != ISOCBINDING_LOC && s != ISOCBINDING_FUNLOC)
4556 /* The 1 says to add any optional args, if applicable. */
4557 build_formal_args (tmp_sym, tmp_sym, 1);
4559 /* Set this after setting up the symbol, to prevent error messages. */
4560 tmp_sym->attr.use_assoc = 1;
4562 /* This symbol will not be referenced directly. It will be
4563 resolved to the implementation for the given f90 kind. */
4564 tmp_sym->attr.referenced = 0;
4571 gfc_commit_symbol (tmp_sym);
4575 /* Creates a new symbol based off of an old iso_c symbol, with a new
4576 binding label. This function can be used to create a new,
4577 resolved, version of a procedure symbol for c_f_pointer or
4578 c_f_procpointer that is based on the generic symbols. A new
4579 parameter list is created for the new symbol using
4580 build_formal_args(). The add_optional_flag specifies whether the
4581 to add the optional SHAPE argument. The new symbol is
4585 get_iso_c_sym (gfc_symbol *old_sym, char *new_name,
4586 char *new_binding_label, int add_optional_arg)
4588 gfc_symtree *new_symtree = NULL;
4590 /* See if we have a symbol by that name already available, looking
4591 through any parent namespaces. */
4592 gfc_find_sym_tree (new_name, gfc_current_ns, 1, &new_symtree);
4593 if (new_symtree != NULL)
4594 /* Return the existing symbol. */
4595 return new_symtree->n.sym;
4597 /* Create the symtree/symbol, with attempted host association. */
4598 gfc_get_ha_sym_tree (new_name, &new_symtree);
4599 if (new_symtree == NULL)
4600 gfc_internal_error ("get_iso_c_sym(): Unable to create "
4601 "symtree for '%s'", new_name);
4603 /* Now fill in the fields of the resolved symbol with the old sym. */
4604 strcpy (new_symtree->n.sym->binding_label, new_binding_label);
4605 new_symtree->n.sym->attr = old_sym->attr;
4606 new_symtree->n.sym->ts = old_sym->ts;
4607 new_symtree->n.sym->module = gfc_get_string (old_sym->module);
4608 new_symtree->n.sym->from_intmod = old_sym->from_intmod;
4609 new_symtree->n.sym->intmod_sym_id = old_sym->intmod_sym_id;
4610 if (old_sym->attr.function)
4611 new_symtree->n.sym->result = new_symtree->n.sym;
4612 /* Build the formal arg list. */
4613 build_formal_args (new_symtree->n.sym, old_sym, add_optional_arg);
4615 gfc_commit_symbol (new_symtree->n.sym);
4617 return new_symtree->n.sym;
4621 /* Check that a symbol is already typed. If strict is not set, an untyped
4622 symbol is acceptable for non-standard-conforming mode. */
4625 gfc_check_symbol_typed (gfc_symbol* sym, gfc_namespace* ns,
4626 bool strict, locus where)
4630 if (gfc_matching_prefix)
4633 /* Check for the type and try to give it an implicit one. */
4634 if (sym->ts.type == BT_UNKNOWN
4635 && gfc_set_default_type (sym, 0, ns) == FAILURE)
4639 gfc_error ("Symbol '%s' is used before it is typed at %L",
4644 if (gfc_notify_std (GFC_STD_GNU,
4645 "Extension: Symbol '%s' is used before"
4646 " it is typed at %L", sym->name, &where) == FAILURE)
4650 /* Everything is ok. */
4655 /* Construct a typebound-procedure structure. Those are stored in a tentative
4656 list and marked `error' until symbols are committed. */
4659 gfc_get_typebound_proc (gfc_typebound_proc *tb0)
4661 gfc_typebound_proc *result;
4662 tentative_tbp *list_node;
4664 result = XCNEW (gfc_typebound_proc);
4669 list_node = XCNEW (tentative_tbp);
4670 list_node->next = tentative_tbp_list;
4671 list_node->proc = result;
4672 tentative_tbp_list = list_node;
4678 /* Get the super-type of a given derived type. */
4681 gfc_get_derived_super_type (gfc_symbol* derived)
4683 if (!derived->attr.extension)
4686 gcc_assert (derived->components);
4687 gcc_assert (derived->components->ts.type == BT_DERIVED);
4688 gcc_assert (derived->components->ts.u.derived);
4690 return derived->components->ts.u.derived;
4694 /* Get the ultimate super-type of a given derived type. */
4697 gfc_get_ultimate_derived_super_type (gfc_symbol* derived)
4699 if (!derived->attr.extension)
4702 derived = gfc_get_derived_super_type (derived);
4704 if (derived->attr.extension)
4705 return gfc_get_ultimate_derived_super_type (derived);
4711 /* Check if a derived type t2 is an extension of (or equal to) a type t1. */
4714 gfc_type_is_extension_of (gfc_symbol *t1, gfc_symbol *t2)
4716 while (!gfc_compare_derived_types (t1, t2) && t2->attr.extension)
4717 t2 = gfc_get_derived_super_type (t2);
4718 return gfc_compare_derived_types (t1, t2);
4722 /* Check if two typespecs are type compatible (F03:5.1.1.2):
4723 If ts1 is nonpolymorphic, ts2 must be the same type.
4724 If ts1 is polymorphic (CLASS), ts2 must be an extension of ts1. */
4727 gfc_type_compatible (gfc_typespec *ts1, gfc_typespec *ts2)
4729 bool is_class1 = (ts1->type == BT_CLASS);
4730 bool is_class2 = (ts2->type == BT_CLASS);
4731 bool is_derived1 = (ts1->type == BT_DERIVED);
4732 bool is_derived2 = (ts2->type == BT_DERIVED);
4734 if (!is_derived1 && !is_derived2 && !is_class1 && !is_class2)
4735 return (ts1->type == ts2->type);
4737 if (is_derived1 && is_derived2)
4738 return gfc_compare_derived_types (ts1->u.derived, ts2->u.derived);
4740 if (is_class1 && is_derived2)
4741 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4743 else if (is_class1 && is_class2)
4744 return gfc_type_is_extension_of (ts1->u.derived->components->ts.u.derived,
4745 ts2->u.derived->components->ts.u.derived);
4751 /* Find the parent-namespace of the current function. If we're inside
4752 BLOCK constructs, it may not be the current one. */
4755 gfc_find_proc_namespace (gfc_namespace* ns)
4757 while (ns->construct_entities)
4767 /* Check if an associate-variable should be translated as an `implicit' pointer
4768 internally (if it is associated to a variable and not an array with
4772 gfc_is_associate_pointer (gfc_symbol* sym)
4777 if (!sym->assoc->variable)
4780 if (sym->attr.dimension && sym->as->type != AS_EXPLICIT)