1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
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/>. */
29 #include "arith.h" /* For gfc_compare_expr(). */
30 #include "dependency.h"
32 #include "target-memory.h" /* for gfc_simplify_transfer */
33 #include "constructor.h"
35 /* Types used in equivalence statements. */
39 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
43 /* Stack to keep track of the nesting of blocks as we move through the
44 code. See resolve_branch() and resolve_code(). */
46 typedef struct code_stack
48 struct gfc_code *head, *current;
49 struct code_stack *prev;
51 /* This bitmap keeps track of the targets valid for a branch from
52 inside this block except for END {IF|SELECT}s of enclosing
54 bitmap reachable_labels;
58 static code_stack *cs_base = NULL;
61 /* Nonzero if we're inside a FORALL block. */
63 static int forall_flag;
65 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
67 static int omp_workshare_flag;
69 /* Nonzero if we are processing a formal arglist. The corresponding function
70 resets the flag each time that it is read. */
71 static int formal_arg_flag = 0;
73 /* True if we are resolving a specification expression. */
74 static int specification_expr = 0;
76 /* The id of the last entry seen. */
77 static int current_entry_id;
79 /* We use bitmaps to determine if a branch target is valid. */
80 static bitmap_obstack labels_obstack;
82 /* True when simplifying a EXPR_VARIABLE argument to an inquiry function. */
83 static bool inquiry_argument = false;
86 gfc_is_formal_arg (void)
88 return formal_arg_flag;
91 /* Is the symbol host associated? */
93 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
95 for (ns = ns->parent; ns; ns = ns->parent)
104 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
105 an ABSTRACT derived-type. If where is not NULL, an error message with that
106 locus is printed, optionally using name. */
109 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
111 if (ts->type == BT_DERIVED && ts->u.derived->attr.abstract)
116 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
117 name, where, ts->u.derived->name);
119 gfc_error ("ABSTRACT type '%s' used at %L",
120 ts->u.derived->name, where);
130 static void resolve_symbol (gfc_symbol *sym);
131 static gfc_try resolve_intrinsic (gfc_symbol *sym, locus *loc);
134 /* Resolve the interface for a PROCEDURE declaration or procedure pointer. */
137 resolve_procedure_interface (gfc_symbol *sym)
139 if (sym->ts.interface == sym)
141 gfc_error ("PROCEDURE '%s' at %L may not be used as its own interface",
142 sym->name, &sym->declared_at);
145 if (sym->ts.interface->attr.procedure)
147 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared "
148 "in a later PROCEDURE statement", sym->ts.interface->name,
149 sym->name, &sym->declared_at);
153 /* Get the attributes from the interface (now resolved). */
154 if (sym->ts.interface->attr.if_source || sym->ts.interface->attr.intrinsic)
156 gfc_symbol *ifc = sym->ts.interface;
157 resolve_symbol (ifc);
159 if (ifc->attr.intrinsic)
160 resolve_intrinsic (ifc, &ifc->declared_at);
164 sym->ts = ifc->result->ts;
169 sym->ts.interface = ifc;
170 sym->attr.function = ifc->attr.function;
171 sym->attr.subroutine = ifc->attr.subroutine;
172 gfc_copy_formal_args (sym, ifc);
174 sym->attr.allocatable = ifc->attr.allocatable;
175 sym->attr.pointer = ifc->attr.pointer;
176 sym->attr.pure = ifc->attr.pure;
177 sym->attr.elemental = ifc->attr.elemental;
178 sym->attr.dimension = ifc->attr.dimension;
179 sym->attr.contiguous = ifc->attr.contiguous;
180 sym->attr.recursive = ifc->attr.recursive;
181 sym->attr.always_explicit = ifc->attr.always_explicit;
182 sym->attr.ext_attr |= ifc->attr.ext_attr;
183 sym->attr.is_bind_c = ifc->attr.is_bind_c;
184 /* Copy array spec. */
185 sym->as = gfc_copy_array_spec (ifc->as);
189 for (i = 0; i < sym->as->rank; i++)
191 gfc_expr_replace_symbols (sym->as->lower[i], sym);
192 gfc_expr_replace_symbols (sym->as->upper[i], sym);
195 /* Copy char length. */
196 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
198 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
199 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
200 if (sym->ts.u.cl->length && !sym->ts.u.cl->resolved
201 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
205 else if (sym->ts.interface->name[0] != '\0')
207 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
208 sym->ts.interface->name, sym->name, &sym->declared_at);
216 /* Resolve types of formal argument lists. These have to be done early so that
217 the formal argument lists of module procedures can be copied to the
218 containing module before the individual procedures are resolved
219 individually. We also resolve argument lists of procedures in interface
220 blocks because they are self-contained scoping units.
222 Since a dummy argument cannot be a non-dummy procedure, the only
223 resort left for untyped names are the IMPLICIT types. */
226 resolve_formal_arglist (gfc_symbol *proc)
228 gfc_formal_arglist *f;
232 if (proc->result != NULL)
237 if (gfc_elemental (proc)
238 || sym->attr.pointer || sym->attr.allocatable
239 || (sym->as && sym->as->rank > 0))
241 proc->attr.always_explicit = 1;
242 sym->attr.always_explicit = 1;
247 for (f = proc->formal; f; f = f->next)
253 /* Alternate return placeholder. */
254 if (gfc_elemental (proc))
255 gfc_error ("Alternate return specifier in elemental subroutine "
256 "'%s' at %L is not allowed", proc->name,
258 if (proc->attr.function)
259 gfc_error ("Alternate return specifier in function "
260 "'%s' at %L is not allowed", proc->name,
264 else if (sym->attr.procedure && sym->ts.interface
265 && sym->attr.if_source != IFSRC_DECL)
266 resolve_procedure_interface (sym);
268 if (sym->attr.if_source != IFSRC_UNKNOWN)
269 resolve_formal_arglist (sym);
271 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
273 if (gfc_pure (proc) && !gfc_pure (sym))
275 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
276 "also be PURE", sym->name, &sym->declared_at);
280 if (proc->attr.implicit_pure && !gfc_pure(sym))
281 proc->attr.implicit_pure = 0;
283 if (gfc_elemental (proc))
285 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
286 "procedure", &sym->declared_at);
290 if (sym->attr.function
291 && sym->ts.type == BT_UNKNOWN
292 && sym->attr.intrinsic)
294 gfc_intrinsic_sym *isym;
295 isym = gfc_find_function (sym->name);
296 if (isym == NULL || !isym->specific)
298 gfc_error ("Unable to find a specific INTRINSIC procedure "
299 "for the reference '%s' at %L", sym->name,
308 if (sym->ts.type == BT_UNKNOWN && !proc->attr.intrinsic
309 && (!sym->attr.function || sym->result == sym))
310 gfc_set_default_type (sym, 1, sym->ns);
312 gfc_resolve_array_spec (sym->as, 0);
314 /* We can't tell if an array with dimension (:) is assumed or deferred
315 shape until we know if it has the pointer or allocatable attributes.
317 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
318 && !(sym->attr.pointer || sym->attr.allocatable))
320 sym->as->type = AS_ASSUMED_SHAPE;
321 for (i = 0; i < sym->as->rank; i++)
322 sym->as->lower[i] = gfc_get_int_expr (gfc_default_integer_kind,
326 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
327 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
328 || sym->attr.optional)
330 proc->attr.always_explicit = 1;
332 proc->result->attr.always_explicit = 1;
335 /* If the flavor is unknown at this point, it has to be a variable.
336 A procedure specification would have already set the type. */
338 if (sym->attr.flavor == FL_UNKNOWN)
339 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
341 if (gfc_pure (proc) && !sym->attr.pointer
342 && sym->attr.flavor != FL_PROCEDURE)
344 if (proc->attr.function && sym->attr.intent != INTENT_IN)
347 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Argument '%s' "
348 "of pure function '%s' at %L with VALUE "
349 "attribute but without INTENT(IN)", sym->name,
350 proc->name, &sym->declared_at);
352 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
353 "INTENT(IN) or VALUE", sym->name, proc->name,
357 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
360 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Argument '%s' "
361 "of pure subroutine '%s' at %L with VALUE "
362 "attribute but without INTENT", sym->name,
363 proc->name, &sym->declared_at);
365 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
366 "have its INTENT specified or have the VALUE "
367 "attribute", sym->name, proc->name, &sym->declared_at);
371 if (proc->attr.implicit_pure && !sym->attr.pointer
372 && sym->attr.flavor != FL_PROCEDURE)
374 if (proc->attr.function && sym->attr.intent != INTENT_IN)
375 proc->attr.implicit_pure = 0;
377 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
378 proc->attr.implicit_pure = 0;
381 if (gfc_elemental (proc))
384 if (sym->attr.codimension)
386 gfc_error ("Coarray dummy argument '%s' at %L to elemental "
387 "procedure", sym->name, &sym->declared_at);
393 gfc_error ("Argument '%s' of elemental procedure at %L must "
394 "be scalar", sym->name, &sym->declared_at);
398 if (sym->attr.allocatable)
400 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
401 "have the ALLOCATABLE attribute", sym->name,
406 if (sym->attr.pointer)
408 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
409 "have the POINTER attribute", sym->name,
414 if (sym->attr.flavor == FL_PROCEDURE)
416 gfc_error ("Dummy procedure '%s' not allowed in elemental "
417 "procedure '%s' at %L", sym->name, proc->name,
422 if (sym->attr.intent == INTENT_UNKNOWN)
424 gfc_error ("Argument '%s' of elemental procedure '%s' at %L must "
425 "have its INTENT specified", sym->name, proc->name,
431 /* Each dummy shall be specified to be scalar. */
432 if (proc->attr.proc == PROC_ST_FUNCTION)
436 gfc_error ("Argument '%s' of statement function at %L must "
437 "be scalar", sym->name, &sym->declared_at);
441 if (sym->ts.type == BT_CHARACTER)
443 gfc_charlen *cl = sym->ts.u.cl;
444 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
446 gfc_error ("Character-valued argument '%s' of statement "
447 "function at %L must have constant length",
448 sym->name, &sym->declared_at);
458 /* Work function called when searching for symbols that have argument lists
459 associated with them. */
462 find_arglists (gfc_symbol *sym)
464 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
467 resolve_formal_arglist (sym);
471 /* Given a namespace, resolve all formal argument lists within the namespace.
475 resolve_formal_arglists (gfc_namespace *ns)
480 gfc_traverse_ns (ns, find_arglists);
485 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
489 /* If this namespace is not a function or an entry master function,
491 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
492 || sym->attr.entry_master)
495 /* Try to find out of what the return type is. */
496 if (sym->result->ts.type == BT_UNKNOWN && sym->result->ts.interface == NULL)
498 t = gfc_set_default_type (sym->result, 0, ns);
500 if (t == FAILURE && !sym->result->attr.untyped)
502 if (sym->result == sym)
503 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
504 sym->name, &sym->declared_at);
505 else if (!sym->result->attr.proc_pointer)
506 gfc_error ("Result '%s' of contained function '%s' at %L has "
507 "no IMPLICIT type", sym->result->name, sym->name,
508 &sym->result->declared_at);
509 sym->result->attr.untyped = 1;
513 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
514 type, lists the only ways a character length value of * can be used:
515 dummy arguments of procedures, named constants, and function results
516 in external functions. Internal function results and results of module
517 procedures are not on this list, ergo, not permitted. */
519 if (sym->result->ts.type == BT_CHARACTER)
521 gfc_charlen *cl = sym->result->ts.u.cl;
522 if ((!cl || !cl->length) && !sym->result->ts.deferred)
524 /* See if this is a module-procedure and adapt error message
527 gcc_assert (ns->parent && ns->parent->proc_name);
528 module_proc = (ns->parent->proc_name->attr.flavor == FL_MODULE);
530 gfc_error ("Character-valued %s '%s' at %L must not be"
532 module_proc ? _("module procedure")
533 : _("internal function"),
534 sym->name, &sym->declared_at);
540 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
541 introduce duplicates. */
544 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
546 gfc_formal_arglist *f, *new_arglist;
549 for (; new_args != NULL; new_args = new_args->next)
551 new_sym = new_args->sym;
552 /* See if this arg is already in the formal argument list. */
553 for (f = proc->formal; f; f = f->next)
555 if (new_sym == f->sym)
562 /* Add a new argument. Argument order is not important. */
563 new_arglist = gfc_get_formal_arglist ();
564 new_arglist->sym = new_sym;
565 new_arglist->next = proc->formal;
566 proc->formal = new_arglist;
571 /* Flag the arguments that are not present in all entries. */
574 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
576 gfc_formal_arglist *f, *head;
579 for (f = proc->formal; f; f = f->next)
584 for (new_args = head; new_args; new_args = new_args->next)
586 if (new_args->sym == f->sym)
593 f->sym->attr.not_always_present = 1;
598 /* Resolve alternate entry points. If a symbol has multiple entry points we
599 create a new master symbol for the main routine, and turn the existing
600 symbol into an entry point. */
603 resolve_entries (gfc_namespace *ns)
605 gfc_namespace *old_ns;
609 char name[GFC_MAX_SYMBOL_LEN + 1];
610 static int master_count = 0;
612 if (ns->proc_name == NULL)
615 /* No need to do anything if this procedure doesn't have alternate entry
620 /* We may already have resolved alternate entry points. */
621 if (ns->proc_name->attr.entry_master)
624 /* If this isn't a procedure something has gone horribly wrong. */
625 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
627 /* Remember the current namespace. */
628 old_ns = gfc_current_ns;
632 /* Add the main entry point to the list of entry points. */
633 el = gfc_get_entry_list ();
634 el->sym = ns->proc_name;
636 el->next = ns->entries;
638 ns->proc_name->attr.entry = 1;
640 /* If it is a module function, it needs to be in the right namespace
641 so that gfc_get_fake_result_decl can gather up the results. The
642 need for this arose in get_proc_name, where these beasts were
643 left in their own namespace, to keep prior references linked to
644 the entry declaration.*/
645 if (ns->proc_name->attr.function
646 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
649 /* Do the same for entries where the master is not a module
650 procedure. These are retained in the module namespace because
651 of the module procedure declaration. */
652 for (el = el->next; el; el = el->next)
653 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
654 && el->sym->attr.mod_proc)
658 /* Add an entry statement for it. */
665 /* Create a new symbol for the master function. */
666 /* Give the internal function a unique name (within this file).
667 Also include the function name so the user has some hope of figuring
668 out what is going on. */
669 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
670 master_count++, ns->proc_name->name);
671 gfc_get_ha_symbol (name, &proc);
672 gcc_assert (proc != NULL);
674 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
675 if (ns->proc_name->attr.subroutine)
676 gfc_add_subroutine (&proc->attr, proc->name, NULL);
680 gfc_typespec *ts, *fts;
681 gfc_array_spec *as, *fas;
682 gfc_add_function (&proc->attr, proc->name, NULL);
684 fas = ns->entries->sym->as;
685 fas = fas ? fas : ns->entries->sym->result->as;
686 fts = &ns->entries->sym->result->ts;
687 if (fts->type == BT_UNKNOWN)
688 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
689 for (el = ns->entries->next; el; el = el->next)
691 ts = &el->sym->result->ts;
693 as = as ? as : el->sym->result->as;
694 if (ts->type == BT_UNKNOWN)
695 ts = gfc_get_default_type (el->sym->result->name, NULL);
697 if (! gfc_compare_types (ts, fts)
698 || (el->sym->result->attr.dimension
699 != ns->entries->sym->result->attr.dimension)
700 || (el->sym->result->attr.pointer
701 != ns->entries->sym->result->attr.pointer))
703 else if (as && fas && ns->entries->sym->result != el->sym->result
704 && gfc_compare_array_spec (as, fas) == 0)
705 gfc_error ("Function %s at %L has entries with mismatched "
706 "array specifications", ns->entries->sym->name,
707 &ns->entries->sym->declared_at);
708 /* The characteristics need to match and thus both need to have
709 the same string length, i.e. both len=*, or both len=4.
710 Having both len=<variable> is also possible, but difficult to
711 check at compile time. */
712 else if (ts->type == BT_CHARACTER && ts->u.cl && fts->u.cl
713 && (((ts->u.cl->length && !fts->u.cl->length)
714 ||(!ts->u.cl->length && fts->u.cl->length))
716 && ts->u.cl->length->expr_type
717 != fts->u.cl->length->expr_type)
719 && ts->u.cl->length->expr_type == EXPR_CONSTANT
720 && mpz_cmp (ts->u.cl->length->value.integer,
721 fts->u.cl->length->value.integer) != 0)))
722 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
723 "entries returning variables of different "
724 "string lengths", ns->entries->sym->name,
725 &ns->entries->sym->declared_at);
730 sym = ns->entries->sym->result;
731 /* All result types the same. */
733 if (sym->attr.dimension)
734 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
735 if (sym->attr.pointer)
736 gfc_add_pointer (&proc->attr, NULL);
740 /* Otherwise the result will be passed through a union by
742 proc->attr.mixed_entry_master = 1;
743 for (el = ns->entries; el; el = el->next)
745 sym = el->sym->result;
746 if (sym->attr.dimension)
748 if (el == ns->entries)
749 gfc_error ("FUNCTION result %s can't be an array in "
750 "FUNCTION %s at %L", sym->name,
751 ns->entries->sym->name, &sym->declared_at);
753 gfc_error ("ENTRY result %s can't be an array in "
754 "FUNCTION %s at %L", sym->name,
755 ns->entries->sym->name, &sym->declared_at);
757 else if (sym->attr.pointer)
759 if (el == ns->entries)
760 gfc_error ("FUNCTION result %s can't be a POINTER in "
761 "FUNCTION %s at %L", sym->name,
762 ns->entries->sym->name, &sym->declared_at);
764 gfc_error ("ENTRY result %s can't be a POINTER in "
765 "FUNCTION %s at %L", sym->name,
766 ns->entries->sym->name, &sym->declared_at);
771 if (ts->type == BT_UNKNOWN)
772 ts = gfc_get_default_type (sym->name, NULL);
776 if (ts->kind == gfc_default_integer_kind)
780 if (ts->kind == gfc_default_real_kind
781 || ts->kind == gfc_default_double_kind)
785 if (ts->kind == gfc_default_complex_kind)
789 if (ts->kind == gfc_default_logical_kind)
793 /* We will issue error elsewhere. */
801 if (el == ns->entries)
802 gfc_error ("FUNCTION result %s can't be of type %s "
803 "in FUNCTION %s at %L", sym->name,
804 gfc_typename (ts), ns->entries->sym->name,
807 gfc_error ("ENTRY result %s can't be of type %s "
808 "in FUNCTION %s at %L", sym->name,
809 gfc_typename (ts), ns->entries->sym->name,
816 proc->attr.access = ACCESS_PRIVATE;
817 proc->attr.entry_master = 1;
819 /* Merge all the entry point arguments. */
820 for (el = ns->entries; el; el = el->next)
821 merge_argument_lists (proc, el->sym->formal);
823 /* Check the master formal arguments for any that are not
824 present in all entry points. */
825 for (el = ns->entries; el; el = el->next)
826 check_argument_lists (proc, el->sym->formal);
828 /* Use the master function for the function body. */
829 ns->proc_name = proc;
831 /* Finalize the new symbols. */
832 gfc_commit_symbols ();
834 /* Restore the original namespace. */
835 gfc_current_ns = old_ns;
839 /* Resolve common variables. */
841 resolve_common_vars (gfc_symbol *sym, bool named_common)
843 gfc_symbol *csym = sym;
845 for (; csym; csym = csym->common_next)
847 if (csym->value || csym->attr.data)
849 if (!csym->ns->is_block_data)
850 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
851 "but only in BLOCK DATA initialization is "
852 "allowed", csym->name, &csym->declared_at);
853 else if (!named_common)
854 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
855 "in a blank COMMON but initialization is only "
856 "allowed in named common blocks", csym->name,
860 if (csym->ts.type != BT_DERIVED)
863 if (!(csym->ts.u.derived->attr.sequence
864 || csym->ts.u.derived->attr.is_bind_c))
865 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
866 "has neither the SEQUENCE nor the BIND(C) "
867 "attribute", csym->name, &csym->declared_at);
868 if (csym->ts.u.derived->attr.alloc_comp)
869 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
870 "has an ultimate component that is "
871 "allocatable", csym->name, &csym->declared_at);
872 if (gfc_has_default_initializer (csym->ts.u.derived))
873 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
874 "may not have default initializer", csym->name,
877 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
878 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
882 /* Resolve common blocks. */
884 resolve_common_blocks (gfc_symtree *common_root)
888 if (common_root == NULL)
891 if (common_root->left)
892 resolve_common_blocks (common_root->left);
893 if (common_root->right)
894 resolve_common_blocks (common_root->right);
896 resolve_common_vars (common_root->n.common->head, true);
898 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
902 if (sym->attr.flavor == FL_PARAMETER)
903 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
904 sym->name, &common_root->n.common->where, &sym->declared_at);
906 if (sym->attr.intrinsic)
907 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
908 sym->name, &common_root->n.common->where);
909 else if (sym->attr.result
910 || gfc_is_function_return_value (sym, gfc_current_ns))
911 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
912 "that is also a function result", sym->name,
913 &common_root->n.common->where);
914 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
915 && sym->attr.proc != PROC_ST_FUNCTION)
916 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
917 "that is also a global procedure", sym->name,
918 &common_root->n.common->where);
922 /* Resolve contained function types. Because contained functions can call one
923 another, they have to be worked out before any of the contained procedures
926 The good news is that if a function doesn't already have a type, the only
927 way it can get one is through an IMPLICIT type or a RESULT variable, because
928 by definition contained functions are contained namespace they're contained
929 in, not in a sibling or parent namespace. */
932 resolve_contained_functions (gfc_namespace *ns)
934 gfc_namespace *child;
937 resolve_formal_arglists (ns);
939 for (child = ns->contained; child; child = child->sibling)
941 /* Resolve alternate entry points first. */
942 resolve_entries (child);
944 /* Then check function return types. */
945 resolve_contained_fntype (child->proc_name, child);
946 for (el = child->entries; el; el = el->next)
947 resolve_contained_fntype (el->sym, child);
952 /* Resolve all of the elements of a structure constructor and make sure that
953 the types are correct. The 'init' flag indicates that the given
954 constructor is an initializer. */
957 resolve_structure_cons (gfc_expr *expr, int init)
959 gfc_constructor *cons;
966 if (expr->ts.type == BT_DERIVED)
967 resolve_symbol (expr->ts.u.derived);
969 cons = gfc_constructor_first (expr->value.constructor);
970 /* A constructor may have references if it is the result of substituting a
971 parameter variable. In this case we just pull out the component we
974 comp = expr->ref->u.c.sym->components;
976 comp = expr->ts.u.derived->components;
978 /* See if the user is trying to invoke a structure constructor for one of
979 the iso_c_binding derived types. */
980 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
981 && expr->ts.u.derived->ts.is_iso_c && cons
982 && (cons->expr == NULL || cons->expr->expr_type != EXPR_NULL))
984 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
985 expr->ts.u.derived->name, &(expr->where));
989 /* Return if structure constructor is c_null_(fun)prt. */
990 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
991 && expr->ts.u.derived->ts.is_iso_c && cons
992 && cons->expr && cons->expr->expr_type == EXPR_NULL)
995 for (; comp && cons; comp = comp->next, cons = gfc_constructor_next (cons))
1002 if (gfc_resolve_expr (cons->expr) == FAILURE)
1008 rank = comp->as ? comp->as->rank : 0;
1009 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
1010 && (comp->attr.allocatable || cons->expr->rank))
1012 gfc_error ("The rank of the element in the derived type "
1013 "constructor at %L does not match that of the "
1014 "component (%d/%d)", &cons->expr->where,
1015 cons->expr->rank, rank);
1019 /* If we don't have the right type, try to convert it. */
1021 if (!comp->attr.proc_pointer &&
1022 !gfc_compare_types (&cons->expr->ts, &comp->ts))
1025 if (strcmp (comp->name, "_extends") == 0)
1027 /* Can afford to be brutal with the _extends initializer.
1028 The derived type can get lost because it is PRIVATE
1029 but it is not usage constrained by the standard. */
1030 cons->expr->ts = comp->ts;
1033 else if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
1034 gfc_error ("The element in the derived type constructor at %L, "
1035 "for pointer component '%s', is %s but should be %s",
1036 &cons->expr->where, comp->name,
1037 gfc_basic_typename (cons->expr->ts.type),
1038 gfc_basic_typename (comp->ts.type));
1040 t = gfc_convert_type (cons->expr, &comp->ts, 1);
1043 /* For strings, the length of the constructor should be the same as
1044 the one of the structure, ensure this if the lengths are known at
1045 compile time and when we are dealing with PARAMETER or structure
1047 if (cons->expr->ts.type == BT_CHARACTER && comp->ts.u.cl
1048 && comp->ts.u.cl->length
1049 && comp->ts.u.cl->length->expr_type == EXPR_CONSTANT
1050 && cons->expr->ts.u.cl && cons->expr->ts.u.cl->length
1051 && cons->expr->ts.u.cl->length->expr_type == EXPR_CONSTANT
1052 && mpz_cmp (cons->expr->ts.u.cl->length->value.integer,
1053 comp->ts.u.cl->length->value.integer) != 0)
1055 if (cons->expr->expr_type == EXPR_VARIABLE
1056 && cons->expr->symtree->n.sym->attr.flavor == FL_PARAMETER)
1058 /* Wrap the parameter in an array constructor (EXPR_ARRAY)
1059 to make use of the gfc_resolve_character_array_constructor
1060 machinery. The expression is later simplified away to
1061 an array of string literals. */
1062 gfc_expr *para = cons->expr;
1063 cons->expr = gfc_get_expr ();
1064 cons->expr->ts = para->ts;
1065 cons->expr->where = para->where;
1066 cons->expr->expr_type = EXPR_ARRAY;
1067 cons->expr->rank = para->rank;
1068 cons->expr->shape = gfc_copy_shape (para->shape, para->rank);
1069 gfc_constructor_append_expr (&cons->expr->value.constructor,
1070 para, &cons->expr->where);
1072 if (cons->expr->expr_type == EXPR_ARRAY)
1075 p = gfc_constructor_first (cons->expr->value.constructor);
1076 if (cons->expr->ts.u.cl != p->expr->ts.u.cl)
1078 gfc_charlen *cl, *cl2;
1081 for (cl = gfc_current_ns->cl_list; cl; cl = cl->next)
1083 if (cl == cons->expr->ts.u.cl)
1091 cl2->next = cl->next;
1093 gfc_free_expr (cl->length);
1097 cons->expr->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
1098 cons->expr->ts.u.cl->length_from_typespec = true;
1099 cons->expr->ts.u.cl->length = gfc_copy_expr (comp->ts.u.cl->length);
1100 gfc_resolve_character_array_constructor (cons->expr);
1104 if (cons->expr->expr_type == EXPR_NULL
1105 && !(comp->attr.pointer || comp->attr.allocatable
1106 || comp->attr.proc_pointer
1107 || (comp->ts.type == BT_CLASS
1108 && (CLASS_DATA (comp)->attr.class_pointer
1109 || CLASS_DATA (comp)->attr.allocatable))))
1112 gfc_error ("The NULL in the derived type constructor at %L is "
1113 "being applied to component '%s', which is neither "
1114 "a POINTER nor ALLOCATABLE", &cons->expr->where,
1118 if (!comp->attr.pointer || comp->attr.proc_pointer
1119 || cons->expr->expr_type == EXPR_NULL)
1122 a = gfc_expr_attr (cons->expr);
1124 if (!a.pointer && !a.target)
1127 gfc_error ("The element in the derived type constructor at %L, "
1128 "for pointer component '%s' should be a POINTER or "
1129 "a TARGET", &cons->expr->where, comp->name);
1134 /* F08:C461. Additional checks for pointer initialization. */
1138 gfc_error ("Pointer initialization target at %L "
1139 "must not be ALLOCATABLE ", &cons->expr->where);
1144 gfc_error ("Pointer initialization target at %L "
1145 "must have the SAVE attribute", &cons->expr->where);
1149 /* F2003, C1272 (3). */
1150 if (gfc_pure (NULL) && cons->expr->expr_type == EXPR_VARIABLE
1151 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1152 || gfc_is_coindexed (cons->expr)))
1155 gfc_error ("Invalid expression in the derived type constructor for "
1156 "pointer component '%s' at %L in PURE procedure",
1157 comp->name, &cons->expr->where);
1160 if (gfc_implicit_pure (NULL)
1161 && cons->expr->expr_type == EXPR_VARIABLE
1162 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1163 || gfc_is_coindexed (cons->expr)))
1164 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1172 /****************** Expression name resolution ******************/
1174 /* Returns 0 if a symbol was not declared with a type or
1175 attribute declaration statement, nonzero otherwise. */
1178 was_declared (gfc_symbol *sym)
1184 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
1187 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
1188 || a.optional || a.pointer || a.save || a.target || a.volatile_
1189 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
1190 || a.asynchronous || a.codimension)
1197 /* Determine if a symbol is generic or not. */
1200 generic_sym (gfc_symbol *sym)
1204 if (sym->attr.generic ||
1205 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
1208 if (was_declared (sym) || sym->ns->parent == NULL)
1211 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1218 return generic_sym (s);
1225 /* Determine if a symbol is specific or not. */
1228 specific_sym (gfc_symbol *sym)
1232 if (sym->attr.if_source == IFSRC_IFBODY
1233 || sym->attr.proc == PROC_MODULE
1234 || sym->attr.proc == PROC_INTERNAL
1235 || sym->attr.proc == PROC_ST_FUNCTION
1236 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
1237 || sym->attr.external)
1240 if (was_declared (sym) || sym->ns->parent == NULL)
1243 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1245 return (s == NULL) ? 0 : specific_sym (s);
1249 /* Figure out if the procedure is specific, generic or unknown. */
1252 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1256 procedure_kind (gfc_symbol *sym)
1258 if (generic_sym (sym))
1259 return PTYPE_GENERIC;
1261 if (specific_sym (sym))
1262 return PTYPE_SPECIFIC;
1264 return PTYPE_UNKNOWN;
1267 /* Check references to assumed size arrays. The flag need_full_assumed_size
1268 is nonzero when matching actual arguments. */
1270 static int need_full_assumed_size = 0;
1273 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1275 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1278 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1279 What should it be? */
1280 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1281 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1282 && (e->ref->u.ar.type == AR_FULL))
1284 gfc_error ("The upper bound in the last dimension must "
1285 "appear in the reference to the assumed size "
1286 "array '%s' at %L", sym->name, &e->where);
1293 /* Look for bad assumed size array references in argument expressions
1294 of elemental and array valued intrinsic procedures. Since this is
1295 called from procedure resolution functions, it only recurses at
1299 resolve_assumed_size_actual (gfc_expr *e)
1304 switch (e->expr_type)
1307 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1312 if (resolve_assumed_size_actual (e->value.op.op1)
1313 || resolve_assumed_size_actual (e->value.op.op2))
1324 /* Check a generic procedure, passed as an actual argument, to see if
1325 there is a matching specific name. If none, it is an error, and if
1326 more than one, the reference is ambiguous. */
1328 count_specific_procs (gfc_expr *e)
1335 sym = e->symtree->n.sym;
1337 for (p = sym->generic; p; p = p->next)
1338 if (strcmp (sym->name, p->sym->name) == 0)
1340 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1346 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1350 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1351 "argument at %L", sym->name, &e->where);
1357 /* See if a call to sym could possibly be a not allowed RECURSION because of
1358 a missing RECURIVE declaration. This means that either sym is the current
1359 context itself, or sym is the parent of a contained procedure calling its
1360 non-RECURSIVE containing procedure.
1361 This also works if sym is an ENTRY. */
1364 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1366 gfc_symbol* proc_sym;
1367 gfc_symbol* context_proc;
1368 gfc_namespace* real_context;
1370 if (sym->attr.flavor == FL_PROGRAM)
1373 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1375 /* If we've got an ENTRY, find real procedure. */
1376 if (sym->attr.entry && sym->ns->entries)
1377 proc_sym = sym->ns->entries->sym;
1381 /* If sym is RECURSIVE, all is well of course. */
1382 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1385 /* Find the context procedure's "real" symbol if it has entries.
1386 We look for a procedure symbol, so recurse on the parents if we don't
1387 find one (like in case of a BLOCK construct). */
1388 for (real_context = context; ; real_context = real_context->parent)
1390 /* We should find something, eventually! */
1391 gcc_assert (real_context);
1393 context_proc = (real_context->entries ? real_context->entries->sym
1394 : real_context->proc_name);
1396 /* In some special cases, there may not be a proc_name, like for this
1398 real(bad_kind()) function foo () ...
1399 when checking the call to bad_kind ().
1400 In these cases, we simply return here and assume that the
1405 if (context_proc->attr.flavor != FL_LABEL)
1409 /* A call from sym's body to itself is recursion, of course. */
1410 if (context_proc == proc_sym)
1413 /* The same is true if context is a contained procedure and sym the
1415 if (context_proc->attr.contained)
1417 gfc_symbol* parent_proc;
1419 gcc_assert (context->parent);
1420 parent_proc = (context->parent->entries ? context->parent->entries->sym
1421 : context->parent->proc_name);
1423 if (parent_proc == proc_sym)
1431 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1432 its typespec and formal argument list. */
1435 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1437 gfc_intrinsic_sym* isym = NULL;
1443 /* We already know this one is an intrinsic, so we don't call
1444 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1445 gfc_find_subroutine directly to check whether it is a function or
1448 if (sym->intmod_sym_id)
1449 isym = gfc_intrinsic_function_by_id ((gfc_isym_id) sym->intmod_sym_id);
1451 isym = gfc_find_function (sym->name);
1455 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1456 && !sym->attr.implicit_type)
1457 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1458 " ignored", sym->name, &sym->declared_at);
1460 if (!sym->attr.function &&
1461 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1466 else if ((isym = gfc_find_subroutine (sym->name)))
1468 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1470 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1471 " specifier", sym->name, &sym->declared_at);
1475 if (!sym->attr.subroutine &&
1476 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1481 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1486 gfc_copy_formal_args_intr (sym, isym);
1488 /* Check it is actually available in the standard settings. */
1489 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1492 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1493 " available in the current standard settings but %s. Use"
1494 " an appropriate -std=* option or enable -fall-intrinsics"
1495 " in order to use it.",
1496 sym->name, &sym->declared_at, symstd);
1504 /* Resolve a procedure expression, like passing it to a called procedure or as
1505 RHS for a procedure pointer assignment. */
1508 resolve_procedure_expression (gfc_expr* expr)
1512 if (expr->expr_type != EXPR_VARIABLE)
1514 gcc_assert (expr->symtree);
1516 sym = expr->symtree->n.sym;
1518 if (sym->attr.intrinsic)
1519 resolve_intrinsic (sym, &expr->where);
1521 if (sym->attr.flavor != FL_PROCEDURE
1522 || (sym->attr.function && sym->result == sym))
1525 /* A non-RECURSIVE procedure that is used as procedure expression within its
1526 own body is in danger of being called recursively. */
1527 if (is_illegal_recursion (sym, gfc_current_ns))
1528 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1529 " itself recursively. Declare it RECURSIVE or use"
1530 " -frecursive", sym->name, &expr->where);
1536 /* Resolve an actual argument list. Most of the time, this is just
1537 resolving the expressions in the list.
1538 The exception is that we sometimes have to decide whether arguments
1539 that look like procedure arguments are really simple variable
1543 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1544 bool no_formal_args)
1547 gfc_symtree *parent_st;
1549 int save_need_full_assumed_size;
1551 for (; arg; arg = arg->next)
1556 /* Check the label is a valid branching target. */
1559 if (arg->label->defined == ST_LABEL_UNKNOWN)
1561 gfc_error ("Label %d referenced at %L is never defined",
1562 arg->label->value, &arg->label->where);
1569 if (e->expr_type == EXPR_VARIABLE
1570 && e->symtree->n.sym->attr.generic
1572 && count_specific_procs (e) != 1)
1575 if (e->ts.type != BT_PROCEDURE)
1577 save_need_full_assumed_size = need_full_assumed_size;
1578 if (e->expr_type != EXPR_VARIABLE)
1579 need_full_assumed_size = 0;
1580 if (gfc_resolve_expr (e) != SUCCESS)
1582 need_full_assumed_size = save_need_full_assumed_size;
1586 /* See if the expression node should really be a variable reference. */
1588 sym = e->symtree->n.sym;
1590 if (sym->attr.flavor == FL_PROCEDURE
1591 || sym->attr.intrinsic
1592 || sym->attr.external)
1596 /* If a procedure is not already determined to be something else
1597 check if it is intrinsic. */
1598 if (!sym->attr.intrinsic
1599 && !(sym->attr.external || sym->attr.use_assoc
1600 || sym->attr.if_source == IFSRC_IFBODY)
1601 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1602 sym->attr.intrinsic = 1;
1604 if (sym->attr.proc == PROC_ST_FUNCTION)
1606 gfc_error ("Statement function '%s' at %L is not allowed as an "
1607 "actual argument", sym->name, &e->where);
1610 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1611 sym->attr.subroutine);
1612 if (sym->attr.intrinsic && actual_ok == 0)
1614 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1615 "actual argument", sym->name, &e->where);
1618 if (sym->attr.contained && !sym->attr.use_assoc
1619 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1621 if (gfc_notify_std (GFC_STD_F2008,
1622 "Fortran 2008: Internal procedure '%s' is"
1623 " used as actual argument at %L",
1624 sym->name, &e->where) == FAILURE)
1628 if (sym->attr.elemental && !sym->attr.intrinsic)
1630 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1631 "allowed as an actual argument at %L", sym->name,
1635 /* Check if a generic interface has a specific procedure
1636 with the same name before emitting an error. */
1637 if (sym->attr.generic && count_specific_procs (e) != 1)
1640 /* Just in case a specific was found for the expression. */
1641 sym = e->symtree->n.sym;
1643 /* If the symbol is the function that names the current (or
1644 parent) scope, then we really have a variable reference. */
1646 if (gfc_is_function_return_value (sym, sym->ns))
1649 /* If all else fails, see if we have a specific intrinsic. */
1650 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1652 gfc_intrinsic_sym *isym;
1654 isym = gfc_find_function (sym->name);
1655 if (isym == NULL || !isym->specific)
1657 gfc_error ("Unable to find a specific INTRINSIC procedure "
1658 "for the reference '%s' at %L", sym->name,
1663 sym->attr.intrinsic = 1;
1664 sym->attr.function = 1;
1667 if (gfc_resolve_expr (e) == FAILURE)
1672 /* See if the name is a module procedure in a parent unit. */
1674 if (was_declared (sym) || sym->ns->parent == NULL)
1677 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1679 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1683 if (parent_st == NULL)
1686 sym = parent_st->n.sym;
1687 e->symtree = parent_st; /* Point to the right thing. */
1689 if (sym->attr.flavor == FL_PROCEDURE
1690 || sym->attr.intrinsic
1691 || sym->attr.external)
1693 if (gfc_resolve_expr (e) == FAILURE)
1699 e->expr_type = EXPR_VARIABLE;
1701 if (sym->as != NULL)
1703 e->rank = sym->as->rank;
1704 e->ref = gfc_get_ref ();
1705 e->ref->type = REF_ARRAY;
1706 e->ref->u.ar.type = AR_FULL;
1707 e->ref->u.ar.as = sym->as;
1710 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1711 primary.c (match_actual_arg). If above code determines that it
1712 is a variable instead, it needs to be resolved as it was not
1713 done at the beginning of this function. */
1714 save_need_full_assumed_size = need_full_assumed_size;
1715 if (e->expr_type != EXPR_VARIABLE)
1716 need_full_assumed_size = 0;
1717 if (gfc_resolve_expr (e) != SUCCESS)
1719 need_full_assumed_size = save_need_full_assumed_size;
1722 /* Check argument list functions %VAL, %LOC and %REF. There is
1723 nothing to do for %REF. */
1724 if (arg->name && arg->name[0] == '%')
1726 if (strncmp ("%VAL", arg->name, 4) == 0)
1728 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1730 gfc_error ("By-value argument at %L is not of numeric "
1737 gfc_error ("By-value argument at %L cannot be an array or "
1738 "an array section", &e->where);
1742 /* Intrinsics are still PROC_UNKNOWN here. However,
1743 since same file external procedures are not resolvable
1744 in gfortran, it is a good deal easier to leave them to
1746 if (ptype != PROC_UNKNOWN
1747 && ptype != PROC_DUMMY
1748 && ptype != PROC_EXTERNAL
1749 && ptype != PROC_MODULE)
1751 gfc_error ("By-value argument at %L is not allowed "
1752 "in this context", &e->where);
1757 /* Statement functions have already been excluded above. */
1758 else if (strncmp ("%LOC", arg->name, 4) == 0
1759 && e->ts.type == BT_PROCEDURE)
1761 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1763 gfc_error ("Passing internal procedure at %L by location "
1764 "not allowed", &e->where);
1770 /* Fortran 2008, C1237. */
1771 if (e->expr_type == EXPR_VARIABLE && gfc_is_coindexed (e)
1772 && gfc_has_ultimate_pointer (e))
1774 gfc_error ("Coindexed actual argument at %L with ultimate pointer "
1775 "component", &e->where);
1784 /* Do the checks of the actual argument list that are specific to elemental
1785 procedures. If called with c == NULL, we have a function, otherwise if
1786 expr == NULL, we have a subroutine. */
1789 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1791 gfc_actual_arglist *arg0;
1792 gfc_actual_arglist *arg;
1793 gfc_symbol *esym = NULL;
1794 gfc_intrinsic_sym *isym = NULL;
1796 gfc_intrinsic_arg *iformal = NULL;
1797 gfc_formal_arglist *eformal = NULL;
1798 bool formal_optional = false;
1799 bool set_by_optional = false;
1803 /* Is this an elemental procedure? */
1804 if (expr && expr->value.function.actual != NULL)
1806 if (expr->value.function.esym != NULL
1807 && expr->value.function.esym->attr.elemental)
1809 arg0 = expr->value.function.actual;
1810 esym = expr->value.function.esym;
1812 else if (expr->value.function.isym != NULL
1813 && expr->value.function.isym->elemental)
1815 arg0 = expr->value.function.actual;
1816 isym = expr->value.function.isym;
1821 else if (c && c->ext.actual != NULL)
1823 arg0 = c->ext.actual;
1825 if (c->resolved_sym)
1826 esym = c->resolved_sym;
1828 esym = c->symtree->n.sym;
1831 if (!esym->attr.elemental)
1837 /* The rank of an elemental is the rank of its array argument(s). */
1838 for (arg = arg0; arg; arg = arg->next)
1840 if (arg->expr != NULL && arg->expr->rank > 0)
1842 rank = arg->expr->rank;
1843 if (arg->expr->expr_type == EXPR_VARIABLE
1844 && arg->expr->symtree->n.sym->attr.optional)
1845 set_by_optional = true;
1847 /* Function specific; set the result rank and shape. */
1851 if (!expr->shape && arg->expr->shape)
1853 expr->shape = gfc_get_shape (rank);
1854 for (i = 0; i < rank; i++)
1855 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1862 /* If it is an array, it shall not be supplied as an actual argument
1863 to an elemental procedure unless an array of the same rank is supplied
1864 as an actual argument corresponding to a nonoptional dummy argument of
1865 that elemental procedure(12.4.1.5). */
1866 formal_optional = false;
1868 iformal = isym->formal;
1870 eformal = esym->formal;
1872 for (arg = arg0; arg; arg = arg->next)
1876 if (eformal->sym && eformal->sym->attr.optional)
1877 formal_optional = true;
1878 eformal = eformal->next;
1880 else if (isym && iformal)
1882 if (iformal->optional)
1883 formal_optional = true;
1884 iformal = iformal->next;
1887 formal_optional = true;
1889 if (pedantic && arg->expr != NULL
1890 && arg->expr->expr_type == EXPR_VARIABLE
1891 && arg->expr->symtree->n.sym->attr.optional
1894 && (set_by_optional || arg->expr->rank != rank)
1895 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1897 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1898 "MISSING, it cannot be the actual argument of an "
1899 "ELEMENTAL procedure unless there is a non-optional "
1900 "argument with the same rank (12.4.1.5)",
1901 arg->expr->symtree->n.sym->name, &arg->expr->where);
1906 for (arg = arg0; arg; arg = arg->next)
1908 if (arg->expr == NULL || arg->expr->rank == 0)
1911 /* Being elemental, the last upper bound of an assumed size array
1912 argument must be present. */
1913 if (resolve_assumed_size_actual (arg->expr))
1916 /* Elemental procedure's array actual arguments must conform. */
1919 if (gfc_check_conformance (arg->expr, e,
1920 "elemental procedure") == FAILURE)
1927 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1928 is an array, the intent inout/out variable needs to be also an array. */
1929 if (rank > 0 && esym && expr == NULL)
1930 for (eformal = esym->formal, arg = arg0; arg && eformal;
1931 arg = arg->next, eformal = eformal->next)
1932 if ((eformal->sym->attr.intent == INTENT_OUT
1933 || eformal->sym->attr.intent == INTENT_INOUT)
1934 && arg->expr && arg->expr->rank == 0)
1936 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1937 "ELEMENTAL subroutine '%s' is a scalar, but another "
1938 "actual argument is an array", &arg->expr->where,
1939 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1940 : "INOUT", eformal->sym->name, esym->name);
1947 /* This function does the checking of references to global procedures
1948 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1949 77 and 95 standards. It checks for a gsymbol for the name, making
1950 one if it does not already exist. If it already exists, then the
1951 reference being resolved must correspond to the type of gsymbol.
1952 Otherwise, the new symbol is equipped with the attributes of the
1953 reference. The corresponding code that is called in creating
1954 global entities is parse.c.
1956 In addition, for all but -std=legacy, the gsymbols are used to
1957 check the interfaces of external procedures from the same file.
1958 The namespace of the gsymbol is resolved and then, once this is
1959 done the interface is checked. */
1963 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1965 if (!gsym_ns->proc_name->attr.recursive)
1968 if (sym->ns == gsym_ns)
1971 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1978 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1980 if (gsym_ns->entries)
1982 gfc_entry_list *entry = gsym_ns->entries;
1984 for (; entry; entry = entry->next)
1986 if (strcmp (sym->name, entry->sym->name) == 0)
1988 if (strcmp (gsym_ns->proc_name->name,
1989 sym->ns->proc_name->name) == 0)
1993 && strcmp (gsym_ns->proc_name->name,
1994 sym->ns->parent->proc_name->name) == 0)
2003 resolve_global_procedure (gfc_symbol *sym, locus *where,
2004 gfc_actual_arglist **actual, int sub)
2008 enum gfc_symbol_type type;
2010 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
2012 gsym = gfc_get_gsymbol (sym->name);
2014 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
2015 gfc_global_used (gsym, where);
2017 if (gfc_option.flag_whole_file
2018 && (sym->attr.if_source == IFSRC_UNKNOWN
2019 || sym->attr.if_source == IFSRC_IFBODY)
2020 && gsym->type != GSYM_UNKNOWN
2022 && gsym->ns->resolved != -1
2023 && gsym->ns->proc_name
2024 && not_in_recursive (sym, gsym->ns)
2025 && not_entry_self_reference (sym, gsym->ns))
2027 gfc_symbol *def_sym;
2029 /* Resolve the gsymbol namespace if needed. */
2030 if (!gsym->ns->resolved)
2032 gfc_dt_list *old_dt_list;
2033 struct gfc_omp_saved_state old_omp_state;
2035 /* Stash away derived types so that the backend_decls do not
2037 old_dt_list = gfc_derived_types;
2038 gfc_derived_types = NULL;
2039 /* And stash away openmp state. */
2040 gfc_omp_save_and_clear_state (&old_omp_state);
2042 gfc_resolve (gsym->ns);
2044 /* Store the new derived types with the global namespace. */
2045 if (gfc_derived_types)
2046 gsym->ns->derived_types = gfc_derived_types;
2048 /* Restore the derived types of this namespace. */
2049 gfc_derived_types = old_dt_list;
2050 /* And openmp state. */
2051 gfc_omp_restore_state (&old_omp_state);
2054 /* Make sure that translation for the gsymbol occurs before
2055 the procedure currently being resolved. */
2056 ns = gfc_global_ns_list;
2057 for (; ns && ns != gsym->ns; ns = ns->sibling)
2059 if (ns->sibling == gsym->ns)
2061 ns->sibling = gsym->ns->sibling;
2062 gsym->ns->sibling = gfc_global_ns_list;
2063 gfc_global_ns_list = gsym->ns;
2068 def_sym = gsym->ns->proc_name;
2069 if (def_sym->attr.entry_master)
2071 gfc_entry_list *entry;
2072 for (entry = gsym->ns->entries; entry; entry = entry->next)
2073 if (strcmp (entry->sym->name, sym->name) == 0)
2075 def_sym = entry->sym;
2080 /* Differences in constant character lengths. */
2081 if (sym->attr.function && sym->ts.type == BT_CHARACTER)
2083 long int l1 = 0, l2 = 0;
2084 gfc_charlen *cl1 = sym->ts.u.cl;
2085 gfc_charlen *cl2 = def_sym->ts.u.cl;
2088 && cl1->length != NULL
2089 && cl1->length->expr_type == EXPR_CONSTANT)
2090 l1 = mpz_get_si (cl1->length->value.integer);
2093 && cl2->length != NULL
2094 && cl2->length->expr_type == EXPR_CONSTANT)
2095 l2 = mpz_get_si (cl2->length->value.integer);
2097 if (l1 && l2 && l1 != l2)
2098 gfc_error ("Character length mismatch in return type of "
2099 "function '%s' at %L (%ld/%ld)", sym->name,
2100 &sym->declared_at, l1, l2);
2103 /* Type mismatch of function return type and expected type. */
2104 if (sym->attr.function
2105 && !gfc_compare_types (&sym->ts, &def_sym->ts))
2106 gfc_error ("Return type mismatch of function '%s' at %L (%s/%s)",
2107 sym->name, &sym->declared_at, gfc_typename (&sym->ts),
2108 gfc_typename (&def_sym->ts));
2110 if (def_sym->formal && sym->attr.if_source != IFSRC_IFBODY)
2112 gfc_formal_arglist *arg = def_sym->formal;
2113 for ( ; arg; arg = arg->next)
2116 /* F2003, 12.3.1.1 (2a); F2008, 12.4.2.2 (2a) */
2117 else if (arg->sym->attr.allocatable
2118 || arg->sym->attr.asynchronous
2119 || arg->sym->attr.optional
2120 || arg->sym->attr.pointer
2121 || arg->sym->attr.target
2122 || arg->sym->attr.value
2123 || arg->sym->attr.volatile_)
2125 gfc_error ("Dummy argument '%s' of procedure '%s' at %L "
2126 "has an attribute that requires an explicit "
2127 "interface for this procedure", arg->sym->name,
2128 sym->name, &sym->declared_at);
2131 /* F2003, 12.3.1.1 (2b); F2008, 12.4.2.2 (2b) */
2132 else if (arg->sym && arg->sym->as
2133 && arg->sym->as->type == AS_ASSUMED_SHAPE)
2135 gfc_error ("Procedure '%s' at %L with assumed-shape dummy "
2136 "argument '%s' must have an explicit interface",
2137 sym->name, &sym->declared_at, arg->sym->name);
2140 /* F2008, 12.4.2.2 (2c) */
2141 else if (arg->sym->attr.codimension)
2143 gfc_error ("Procedure '%s' at %L with coarray dummy argument "
2144 "'%s' must have an explicit interface",
2145 sym->name, &sym->declared_at, arg->sym->name);
2148 /* F2003, 12.3.1.1 (2c); F2008, 12.4.2.2 (2d) */
2149 else if (false) /* TODO: is a parametrized derived type */
2151 gfc_error ("Procedure '%s' at %L with parametrized derived "
2152 "type argument '%s' must have an explicit "
2153 "interface", sym->name, &sym->declared_at,
2157 /* F2003, 12.3.1.1 (2d); F2008, 12.4.2.2 (2e) */
2158 else if (arg->sym->ts.type == BT_CLASS)
2160 gfc_error ("Procedure '%s' at %L with polymorphic dummy "
2161 "argument '%s' must have an explicit interface",
2162 sym->name, &sym->declared_at, arg->sym->name);
2167 if (def_sym->attr.function)
2169 /* F2003, 12.3.1.1 (3a); F2008, 12.4.2.2 (3a) */
2170 if (def_sym->as && def_sym->as->rank
2171 && (!sym->as || sym->as->rank != def_sym->as->rank))
2172 gfc_error ("The reference to function '%s' at %L either needs an "
2173 "explicit INTERFACE or the rank is incorrect", sym->name,
2176 /* F2003, 12.3.1.1 (3b); F2008, 12.4.2.2 (3b) */
2177 if ((def_sym->result->attr.pointer
2178 || def_sym->result->attr.allocatable)
2179 && (sym->attr.if_source != IFSRC_IFBODY
2180 || def_sym->result->attr.pointer
2181 != sym->result->attr.pointer
2182 || def_sym->result->attr.allocatable
2183 != sym->result->attr.allocatable))
2184 gfc_error ("Function '%s' at %L with a POINTER or ALLOCATABLE "
2185 "result must have an explicit interface", sym->name,
2188 /* F2003, 12.3.1.1 (3c); F2008, 12.4.2.2 (3c) */
2189 if (sym->ts.type == BT_CHARACTER && sym->attr.if_source != IFSRC_IFBODY
2190 && def_sym->ts.u.cl->length != NULL)
2192 gfc_charlen *cl = sym->ts.u.cl;
2194 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
2195 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
2197 gfc_error ("Nonconstant character-length function '%s' at %L "
2198 "must have an explicit interface", sym->name,
2204 /* F2003, 12.3.1.1 (4); F2008, 12.4.2.2 (4) */
2205 if (def_sym->attr.elemental && !sym->attr.elemental)
2207 gfc_error ("ELEMENTAL procedure '%s' at %L must have an explicit "
2208 "interface", sym->name, &sym->declared_at);
2211 /* F2003, 12.3.1.1 (5); F2008, 12.4.2.2 (5) */
2212 if (def_sym->attr.is_bind_c && !sym->attr.is_bind_c)
2214 gfc_error ("Procedure '%s' at %L with BIND(C) attribute must have "
2215 "an explicit interface", sym->name, &sym->declared_at);
2218 if (gfc_option.flag_whole_file == 1
2219 || ((gfc_option.warn_std & GFC_STD_LEGACY)
2220 && !(gfc_option.warn_std & GFC_STD_GNU)))
2221 gfc_errors_to_warnings (1);
2223 if (sym->attr.if_source != IFSRC_IFBODY)
2224 gfc_procedure_use (def_sym, actual, where);
2226 gfc_errors_to_warnings (0);
2229 if (gsym->type == GSYM_UNKNOWN)
2232 gsym->where = *where;
2239 /************* Function resolution *************/
2241 /* Resolve a function call known to be generic.
2242 Section 14.1.2.4.1. */
2245 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
2249 if (sym->attr.generic)
2251 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
2254 expr->value.function.name = s->name;
2255 expr->value.function.esym = s;
2257 if (s->ts.type != BT_UNKNOWN)
2259 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
2260 expr->ts = s->result->ts;
2263 expr->rank = s->as->rank;
2264 else if (s->result != NULL && s->result->as != NULL)
2265 expr->rank = s->result->as->rank;
2267 gfc_set_sym_referenced (expr->value.function.esym);
2272 /* TODO: Need to search for elemental references in generic
2276 if (sym->attr.intrinsic)
2277 return gfc_intrinsic_func_interface (expr, 0);
2284 resolve_generic_f (gfc_expr *expr)
2289 sym = expr->symtree->n.sym;
2293 m = resolve_generic_f0 (expr, sym);
2296 else if (m == MATCH_ERROR)
2300 if (sym->ns->parent == NULL)
2302 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2306 if (!generic_sym (sym))
2310 /* Last ditch attempt. See if the reference is to an intrinsic
2311 that possesses a matching interface. 14.1.2.4 */
2312 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
2314 gfc_error ("There is no specific function for the generic '%s' at %L",
2315 expr->symtree->n.sym->name, &expr->where);
2319 m = gfc_intrinsic_func_interface (expr, 0);
2323 gfc_error ("Generic function '%s' at %L is not consistent with a "
2324 "specific intrinsic interface", expr->symtree->n.sym->name,
2331 /* Resolve a function call known to be specific. */
2334 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
2338 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2340 if (sym->attr.dummy)
2342 sym->attr.proc = PROC_DUMMY;
2346 sym->attr.proc = PROC_EXTERNAL;
2350 if (sym->attr.proc == PROC_MODULE
2351 || sym->attr.proc == PROC_ST_FUNCTION
2352 || sym->attr.proc == PROC_INTERNAL)
2355 if (sym->attr.intrinsic)
2357 m = gfc_intrinsic_func_interface (expr, 1);
2361 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2362 "with an intrinsic", sym->name, &expr->where);
2370 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2373 expr->ts = sym->result->ts;
2376 expr->value.function.name = sym->name;
2377 expr->value.function.esym = sym;
2378 if (sym->as != NULL)
2379 expr->rank = sym->as->rank;
2386 resolve_specific_f (gfc_expr *expr)
2391 sym = expr->symtree->n.sym;
2395 m = resolve_specific_f0 (sym, expr);
2398 if (m == MATCH_ERROR)
2401 if (sym->ns->parent == NULL)
2404 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2410 gfc_error ("Unable to resolve the specific function '%s' at %L",
2411 expr->symtree->n.sym->name, &expr->where);
2417 /* Resolve a procedure call not known to be generic nor specific. */
2420 resolve_unknown_f (gfc_expr *expr)
2425 sym = expr->symtree->n.sym;
2427 if (sym->attr.dummy)
2429 sym->attr.proc = PROC_DUMMY;
2430 expr->value.function.name = sym->name;
2434 /* See if we have an intrinsic function reference. */
2436 if (gfc_is_intrinsic (sym, 0, expr->where))
2438 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2443 /* The reference is to an external name. */
2445 sym->attr.proc = PROC_EXTERNAL;
2446 expr->value.function.name = sym->name;
2447 expr->value.function.esym = expr->symtree->n.sym;
2449 if (sym->as != NULL)
2450 expr->rank = sym->as->rank;
2452 /* Type of the expression is either the type of the symbol or the
2453 default type of the symbol. */
2456 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2458 if (sym->ts.type != BT_UNKNOWN)
2462 ts = gfc_get_default_type (sym->name, sym->ns);
2464 if (ts->type == BT_UNKNOWN)
2466 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2467 sym->name, &expr->where);
2478 /* Return true, if the symbol is an external procedure. */
2480 is_external_proc (gfc_symbol *sym)
2482 if (!sym->attr.dummy && !sym->attr.contained
2483 && !(sym->attr.intrinsic
2484 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2485 && sym->attr.proc != PROC_ST_FUNCTION
2486 && !sym->attr.proc_pointer
2487 && !sym->attr.use_assoc
2495 /* Figure out if a function reference is pure or not. Also set the name
2496 of the function for a potential error message. Return nonzero if the
2497 function is PURE, zero if not. */
2499 pure_stmt_function (gfc_expr *, gfc_symbol *);
2502 pure_function (gfc_expr *e, const char **name)
2508 if (e->symtree != NULL
2509 && e->symtree->n.sym != NULL
2510 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2511 return pure_stmt_function (e, e->symtree->n.sym);
2513 if (e->value.function.esym)
2515 pure = gfc_pure (e->value.function.esym);
2516 *name = e->value.function.esym->name;
2518 else if (e->value.function.isym)
2520 pure = e->value.function.isym->pure
2521 || e->value.function.isym->elemental;
2522 *name = e->value.function.isym->name;
2526 /* Implicit functions are not pure. */
2528 *name = e->value.function.name;
2536 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2537 int *f ATTRIBUTE_UNUSED)
2541 /* Don't bother recursing into other statement functions
2542 since they will be checked individually for purity. */
2543 if (e->expr_type != EXPR_FUNCTION
2545 || e->symtree->n.sym == sym
2546 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2549 return pure_function (e, &name) ? false : true;
2554 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2556 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2561 is_scalar_expr_ptr (gfc_expr *expr)
2563 gfc_try retval = SUCCESS;
2568 /* See if we have a gfc_ref, which means we have a substring, array
2569 reference, or a component. */
2570 if (expr->ref != NULL)
2573 while (ref->next != NULL)
2579 if (ref->u.ss.start == NULL || ref->u.ss.end == NULL
2580 || gfc_dep_compare_expr (ref->u.ss.start, ref->u.ss.end) != 0)
2585 if (ref->u.ar.type == AR_ELEMENT)
2587 else if (ref->u.ar.type == AR_FULL)
2589 /* The user can give a full array if the array is of size 1. */
2590 if (ref->u.ar.as != NULL
2591 && ref->u.ar.as->rank == 1
2592 && ref->u.ar.as->type == AS_EXPLICIT
2593 && ref->u.ar.as->lower[0] != NULL
2594 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2595 && ref->u.ar.as->upper[0] != NULL
2596 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2598 /* If we have a character string, we need to check if
2599 its length is one. */
2600 if (expr->ts.type == BT_CHARACTER)
2602 if (expr->ts.u.cl == NULL
2603 || expr->ts.u.cl->length == NULL
2604 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2610 /* We have constant lower and upper bounds. If the
2611 difference between is 1, it can be considered a
2613 FIXME: Use gfc_dep_compare_expr instead. */
2614 start = (int) mpz_get_si
2615 (ref->u.ar.as->lower[0]->value.integer);
2616 end = (int) mpz_get_si
2617 (ref->u.ar.as->upper[0]->value.integer);
2618 if (end - start + 1 != 1)
2633 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2635 /* Character string. Make sure it's of length 1. */
2636 if (expr->ts.u.cl == NULL
2637 || expr->ts.u.cl->length == NULL
2638 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2641 else if (expr->rank != 0)
2648 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2649 and, in the case of c_associated, set the binding label based on
2653 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2654 gfc_symbol **new_sym)
2656 char name[GFC_MAX_SYMBOL_LEN + 1];
2657 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2658 int optional_arg = 0;
2659 gfc_try retval = SUCCESS;
2660 gfc_symbol *args_sym;
2661 gfc_typespec *arg_ts;
2662 symbol_attribute arg_attr;
2664 if (args->expr->expr_type == EXPR_CONSTANT
2665 || args->expr->expr_type == EXPR_OP
2666 || args->expr->expr_type == EXPR_NULL)
2668 gfc_error ("Argument to '%s' at %L is not a variable",
2669 sym->name, &(args->expr->where));
2673 args_sym = args->expr->symtree->n.sym;
2675 /* The typespec for the actual arg should be that stored in the expr
2676 and not necessarily that of the expr symbol (args_sym), because
2677 the actual expression could be a part-ref of the expr symbol. */
2678 arg_ts = &(args->expr->ts);
2679 arg_attr = gfc_expr_attr (args->expr);
2681 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2683 /* If the user gave two args then they are providing something for
2684 the optional arg (the second cptr). Therefore, set the name and
2685 binding label to the c_associated for two cptrs. Otherwise,
2686 set c_associated to expect one cptr. */
2690 sprintf (name, "%s_2", sym->name);
2691 sprintf (binding_label, "%s_2", sym->binding_label);
2697 sprintf (name, "%s_1", sym->name);
2698 sprintf (binding_label, "%s_1", sym->binding_label);
2702 /* Get a new symbol for the version of c_associated that
2704 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2706 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2707 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2709 sprintf (name, "%s", sym->name);
2710 sprintf (binding_label, "%s", sym->binding_label);
2712 /* Error check the call. */
2713 if (args->next != NULL)
2715 gfc_error_now ("More actual than formal arguments in '%s' "
2716 "call at %L", name, &(args->expr->where));
2719 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2724 /* Make sure we have either the target or pointer attribute. */
2725 if (!arg_attr.target && !arg_attr.pointer)
2727 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2728 "a TARGET or an associated pointer",
2730 sym->name, &(args->expr->where));
2734 if (gfc_is_coindexed (args->expr))
2736 gfc_error_now ("Coindexed argument not permitted"
2737 " in '%s' call at %L", name,
2738 &(args->expr->where));
2742 /* Follow references to make sure there are no array
2744 seen_section = false;
2746 for (ref=args->expr->ref; ref; ref = ref->next)
2748 if (ref->type == REF_ARRAY)
2750 if (ref->u.ar.type == AR_SECTION)
2751 seen_section = true;
2753 if (ref->u.ar.type != AR_ELEMENT)
2756 for (r = ref->next; r; r=r->next)
2757 if (r->type == REF_COMPONENT)
2759 gfc_error_now ("Array section not permitted"
2760 " in '%s' call at %L", name,
2761 &(args->expr->where));
2769 if (seen_section && retval == SUCCESS)
2770 gfc_warning ("Array section in '%s' call at %L", name,
2771 &(args->expr->where));
2773 /* See if we have interoperable type and type param. */
2774 if (verify_c_interop (arg_ts) == SUCCESS
2775 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2777 if (args_sym->attr.target == 1)
2779 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2780 has the target attribute and is interoperable. */
2781 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2782 allocatable variable that has the TARGET attribute and
2783 is not an array of zero size. */
2784 if (args_sym->attr.allocatable == 1)
2786 if (args_sym->attr.dimension != 0
2787 && (args_sym->as && args_sym->as->rank == 0))
2789 gfc_error_now ("Allocatable variable '%s' used as a "
2790 "parameter to '%s' at %L must not be "
2791 "an array of zero size",
2792 args_sym->name, sym->name,
2793 &(args->expr->where));
2799 /* A non-allocatable target variable with C
2800 interoperable type and type parameters must be
2802 if (args_sym && args_sym->attr.dimension)
2804 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2806 gfc_error ("Assumed-shape array '%s' at %L "
2807 "cannot be an argument to the "
2808 "procedure '%s' because "
2809 "it is not C interoperable",
2811 &(args->expr->where), sym->name);
2814 else if (args_sym->as->type == AS_DEFERRED)
2816 gfc_error ("Deferred-shape array '%s' at %L "
2817 "cannot be an argument to the "
2818 "procedure '%s' because "
2819 "it is not C interoperable",
2821 &(args->expr->where), sym->name);
2826 /* Make sure it's not a character string. Arrays of
2827 any type should be ok if the variable is of a C
2828 interoperable type. */
2829 if (arg_ts->type == BT_CHARACTER)
2830 if (arg_ts->u.cl != NULL
2831 && (arg_ts->u.cl->length == NULL
2832 || arg_ts->u.cl->length->expr_type
2835 (arg_ts->u.cl->length->value.integer, 1)
2837 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2839 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2840 "at %L must have a length of 1",
2841 args_sym->name, sym->name,
2842 &(args->expr->where));
2847 else if (arg_attr.pointer
2848 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2850 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2852 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2853 "associated scalar POINTER", args_sym->name,
2854 sym->name, &(args->expr->where));
2860 /* The parameter is not required to be C interoperable. If it
2861 is not C interoperable, it must be a nonpolymorphic scalar
2862 with no length type parameters. It still must have either
2863 the pointer or target attribute, and it can be
2864 allocatable (but must be allocated when c_loc is called). */
2865 if (args->expr->rank != 0
2866 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2868 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2869 "scalar", args_sym->name, sym->name,
2870 &(args->expr->where));
2873 else if (arg_ts->type == BT_CHARACTER
2874 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2876 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2877 "%L must have a length of 1",
2878 args_sym->name, sym->name,
2879 &(args->expr->where));
2882 else if (arg_ts->type == BT_CLASS)
2884 gfc_error_now ("Parameter '%s' to '%s' at %L must not be "
2885 "polymorphic", args_sym->name, sym->name,
2886 &(args->expr->where));
2891 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2893 if (args_sym->attr.flavor != FL_PROCEDURE)
2895 /* TODO: Update this error message to allow for procedure
2896 pointers once they are implemented. */
2897 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2899 args_sym->name, sym->name,
2900 &(args->expr->where));
2903 else if (args_sym->attr.is_bind_c != 1)
2905 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2907 args_sym->name, sym->name,
2908 &(args->expr->where));
2913 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2918 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2919 "iso_c_binding function: '%s'!\n", sym->name);
2926 /* Resolve a function call, which means resolving the arguments, then figuring
2927 out which entity the name refers to. */
2930 resolve_function (gfc_expr *expr)
2932 gfc_actual_arglist *arg;
2937 procedure_type p = PROC_INTRINSIC;
2938 bool no_formal_args;
2942 sym = expr->symtree->n.sym;
2944 /* If this is a procedure pointer component, it has already been resolved. */
2945 if (gfc_is_proc_ptr_comp (expr, NULL))
2948 if (sym && sym->attr.intrinsic
2949 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2952 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2954 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2958 /* If this ia a deferred TBP with an abstract interface (which may
2959 of course be referenced), expr->value.function.esym will be set. */
2960 if (sym && sym->attr.abstract && !expr->value.function.esym)
2962 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2963 sym->name, &expr->where);
2967 /* Switch off assumed size checking and do this again for certain kinds
2968 of procedure, once the procedure itself is resolved. */
2969 need_full_assumed_size++;
2971 if (expr->symtree && expr->symtree->n.sym)
2972 p = expr->symtree->n.sym->attr.proc;
2974 if (expr->value.function.isym && expr->value.function.isym->inquiry)
2975 inquiry_argument = true;
2976 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2978 if (resolve_actual_arglist (expr->value.function.actual,
2979 p, no_formal_args) == FAILURE)
2981 inquiry_argument = false;
2985 inquiry_argument = false;
2987 /* Need to setup the call to the correct c_associated, depending on
2988 the number of cptrs to user gives to compare. */
2989 if (sym && sym->attr.is_iso_c == 1)
2991 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2995 /* Get the symtree for the new symbol (resolved func).
2996 the old one will be freed later, when it's no longer used. */
2997 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
3000 /* Resume assumed_size checking. */
3001 need_full_assumed_size--;
3003 /* If the procedure is external, check for usage. */
3004 if (sym && is_external_proc (sym))
3005 resolve_global_procedure (sym, &expr->where,
3006 &expr->value.function.actual, 0);
3008 if (sym && sym->ts.type == BT_CHARACTER
3010 && sym->ts.u.cl->length == NULL
3012 && !sym->ts.deferred
3013 && expr->value.function.esym == NULL
3014 && !sym->attr.contained)
3016 /* Internal procedures are taken care of in resolve_contained_fntype. */
3017 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
3018 "be used at %L since it is not a dummy argument",
3019 sym->name, &expr->where);
3023 /* See if function is already resolved. */
3025 if (expr->value.function.name != NULL)
3027 if (expr->ts.type == BT_UNKNOWN)
3033 /* Apply the rules of section 14.1.2. */
3035 switch (procedure_kind (sym))
3038 t = resolve_generic_f (expr);
3041 case PTYPE_SPECIFIC:
3042 t = resolve_specific_f (expr);
3046 t = resolve_unknown_f (expr);
3050 gfc_internal_error ("resolve_function(): bad function type");
3054 /* If the expression is still a function (it might have simplified),
3055 then we check to see if we are calling an elemental function. */
3057 if (expr->expr_type != EXPR_FUNCTION)
3060 temp = need_full_assumed_size;
3061 need_full_assumed_size = 0;
3063 if (resolve_elemental_actual (expr, NULL) == FAILURE)
3066 if (omp_workshare_flag
3067 && expr->value.function.esym
3068 && ! gfc_elemental (expr->value.function.esym))
3070 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
3071 "in WORKSHARE construct", expr->value.function.esym->name,
3076 #define GENERIC_ID expr->value.function.isym->id
3077 else if (expr->value.function.actual != NULL
3078 && expr->value.function.isym != NULL
3079 && GENERIC_ID != GFC_ISYM_LBOUND
3080 && GENERIC_ID != GFC_ISYM_LEN
3081 && GENERIC_ID != GFC_ISYM_LOC
3082 && GENERIC_ID != GFC_ISYM_PRESENT)
3084 /* Array intrinsics must also have the last upper bound of an
3085 assumed size array argument. UBOUND and SIZE have to be
3086 excluded from the check if the second argument is anything
3089 for (arg = expr->value.function.actual; arg; arg = arg->next)
3091 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
3092 && arg->next != NULL && arg->next->expr)
3094 if (arg->next->expr->expr_type != EXPR_CONSTANT)
3097 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
3100 if ((int)mpz_get_si (arg->next->expr->value.integer)
3105 if (arg->expr != NULL
3106 && arg->expr->rank > 0
3107 && resolve_assumed_size_actual (arg->expr))
3113 need_full_assumed_size = temp;
3116 if (!pure_function (expr, &name) && name)
3120 gfc_error ("reference to non-PURE function '%s' at %L inside a "
3121 "FORALL %s", name, &expr->where,
3122 forall_flag == 2 ? "mask" : "block");
3125 else if (gfc_pure (NULL))
3127 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
3128 "procedure within a PURE procedure", name, &expr->where);
3133 if (!pure_function (expr, &name) && name && gfc_implicit_pure (NULL))
3134 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3136 /* Functions without the RECURSIVE attribution are not allowed to
3137 * call themselves. */
3138 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
3141 esym = expr->value.function.esym;
3143 if (is_illegal_recursion (esym, gfc_current_ns))
3145 if (esym->attr.entry && esym->ns->entries)
3146 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3147 " function '%s' is not RECURSIVE",
3148 esym->name, &expr->where, esym->ns->entries->sym->name);
3150 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
3151 " is not RECURSIVE", esym->name, &expr->where);
3157 /* Character lengths of use associated functions may contains references to
3158 symbols not referenced from the current program unit otherwise. Make sure
3159 those symbols are marked as referenced. */
3161 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
3162 && expr->value.function.esym->attr.use_assoc)
3164 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
3167 /* Make sure that the expression has a typespec that works. */
3168 if (expr->ts.type == BT_UNKNOWN)
3170 if (expr->symtree->n.sym->result
3171 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
3172 && !expr->symtree->n.sym->result->attr.proc_pointer)
3173 expr->ts = expr->symtree->n.sym->result->ts;
3180 /************* Subroutine resolution *************/
3183 pure_subroutine (gfc_code *c, gfc_symbol *sym)
3189 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
3190 sym->name, &c->loc);
3191 else if (gfc_pure (NULL))
3192 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
3198 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
3202 if (sym->attr.generic)
3204 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
3207 c->resolved_sym = s;
3208 pure_subroutine (c, s);
3212 /* TODO: Need to search for elemental references in generic interface. */
3215 if (sym->attr.intrinsic)
3216 return gfc_intrinsic_sub_interface (c, 0);
3223 resolve_generic_s (gfc_code *c)
3228 sym = c->symtree->n.sym;
3232 m = resolve_generic_s0 (c, sym);
3235 else if (m == MATCH_ERROR)
3239 if (sym->ns->parent == NULL)
3241 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3245 if (!generic_sym (sym))
3249 /* Last ditch attempt. See if the reference is to an intrinsic
3250 that possesses a matching interface. 14.1.2.4 */
3251 sym = c->symtree->n.sym;
3253 if (!gfc_is_intrinsic (sym, 1, c->loc))
3255 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
3256 sym->name, &c->loc);
3260 m = gfc_intrinsic_sub_interface (c, 0);
3264 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
3265 "intrinsic subroutine interface", sym->name, &c->loc);
3271 /* Set the name and binding label of the subroutine symbol in the call
3272 expression represented by 'c' to include the type and kind of the
3273 second parameter. This function is for resolving the appropriate
3274 version of c_f_pointer() and c_f_procpointer(). For example, a
3275 call to c_f_pointer() for a default integer pointer could have a
3276 name of c_f_pointer_i4. If no second arg exists, which is an error
3277 for these two functions, it defaults to the generic symbol's name
3278 and binding label. */
3281 set_name_and_label (gfc_code *c, gfc_symbol *sym,
3282 char *name, char *binding_label)
3284 gfc_expr *arg = NULL;
3288 /* The second arg of c_f_pointer and c_f_procpointer determines
3289 the type and kind for the procedure name. */
3290 arg = c->ext.actual->next->expr;
3294 /* Set up the name to have the given symbol's name,
3295 plus the type and kind. */
3296 /* a derived type is marked with the type letter 'u' */
3297 if (arg->ts.type == BT_DERIVED)
3300 kind = 0; /* set the kind as 0 for now */
3304 type = gfc_type_letter (arg->ts.type);
3305 kind = arg->ts.kind;
3308 if (arg->ts.type == BT_CHARACTER)
3309 /* Kind info for character strings not needed. */
3312 sprintf (name, "%s_%c%d", sym->name, type, kind);
3313 /* Set up the binding label as the given symbol's label plus
3314 the type and kind. */
3315 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
3319 /* If the second arg is missing, set the name and label as
3320 was, cause it should at least be found, and the missing
3321 arg error will be caught by compare_parameters(). */
3322 sprintf (name, "%s", sym->name);
3323 sprintf (binding_label, "%s", sym->binding_label);
3330 /* Resolve a generic version of the iso_c_binding procedure given
3331 (sym) to the specific one based on the type and kind of the
3332 argument(s). Currently, this function resolves c_f_pointer() and
3333 c_f_procpointer based on the type and kind of the second argument
3334 (FPTR). Other iso_c_binding procedures aren't specially handled.
3335 Upon successfully exiting, c->resolved_sym will hold the resolved
3336 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
3340 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
3342 gfc_symbol *new_sym;
3343 /* this is fine, since we know the names won't use the max */
3344 char name[GFC_MAX_SYMBOL_LEN + 1];
3345 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
3346 /* default to success; will override if find error */
3347 match m = MATCH_YES;
3349 /* Make sure the actual arguments are in the necessary order (based on the
3350 formal args) before resolving. */
3351 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
3353 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
3354 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
3356 set_name_and_label (c, sym, name, binding_label);
3358 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
3360 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3362 /* Make sure we got a third arg if the second arg has non-zero
3363 rank. We must also check that the type and rank are
3364 correct since we short-circuit this check in
3365 gfc_procedure_use() (called above to sort actual args). */
3366 if (c->ext.actual->next->expr->rank != 0)
3368 if(c->ext.actual->next->next == NULL
3369 || c->ext.actual->next->next->expr == NULL)
3372 gfc_error ("Missing SHAPE parameter for call to %s "
3373 "at %L", sym->name, &(c->loc));
3375 else if (c->ext.actual->next->next->expr->ts.type
3377 || c->ext.actual->next->next->expr->rank != 1)
3380 gfc_error ("SHAPE parameter for call to %s at %L must "
3381 "be a rank 1 INTEGER array", sym->name,
3388 if (m != MATCH_ERROR)
3390 /* the 1 means to add the optional arg to formal list */
3391 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3393 /* for error reporting, say it's declared where the original was */
3394 new_sym->declared_at = sym->declared_at;
3399 /* no differences for c_loc or c_funloc */
3403 /* set the resolved symbol */
3404 if (m != MATCH_ERROR)
3405 c->resolved_sym = new_sym;
3407 c->resolved_sym = sym;
3413 /* Resolve a subroutine call known to be specific. */
3416 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3420 if(sym->attr.is_iso_c)
3422 m = gfc_iso_c_sub_interface (c,sym);
3426 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3428 if (sym->attr.dummy)
3430 sym->attr.proc = PROC_DUMMY;
3434 sym->attr.proc = PROC_EXTERNAL;
3438 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3441 if (sym->attr.intrinsic)
3443 m = gfc_intrinsic_sub_interface (c, 1);
3447 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3448 "with an intrinsic", sym->name, &c->loc);
3456 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3458 c->resolved_sym = sym;
3459 pure_subroutine (c, sym);
3466 resolve_specific_s (gfc_code *c)
3471 sym = c->symtree->n.sym;
3475 m = resolve_specific_s0 (c, sym);
3478 if (m == MATCH_ERROR)
3481 if (sym->ns->parent == NULL)
3484 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3490 sym = c->symtree->n.sym;
3491 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3492 sym->name, &c->loc);
3498 /* Resolve a subroutine call not known to be generic nor specific. */
3501 resolve_unknown_s (gfc_code *c)
3505 sym = c->symtree->n.sym;
3507 if (sym->attr.dummy)
3509 sym->attr.proc = PROC_DUMMY;
3513 /* See if we have an intrinsic function reference. */
3515 if (gfc_is_intrinsic (sym, 1, c->loc))
3517 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3522 /* The reference is to an external name. */
3525 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3527 c->resolved_sym = sym;
3529 pure_subroutine (c, sym);
3535 /* Resolve a subroutine call. Although it was tempting to use the same code
3536 for functions, subroutines and functions are stored differently and this
3537 makes things awkward. */
3540 resolve_call (gfc_code *c)
3543 procedure_type ptype = PROC_INTRINSIC;
3544 gfc_symbol *csym, *sym;
3545 bool no_formal_args;
3547 csym = c->symtree ? c->symtree->n.sym : NULL;
3549 if (csym && csym->ts.type != BT_UNKNOWN)
3551 gfc_error ("'%s' at %L has a type, which is not consistent with "
3552 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3556 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3559 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3560 sym = st ? st->n.sym : NULL;
3561 if (sym && csym != sym
3562 && sym->ns == gfc_current_ns
3563 && sym->attr.flavor == FL_PROCEDURE
3564 && sym->attr.contained)
3567 if (csym->attr.generic)
3568 c->symtree->n.sym = sym;
3571 csym = c->symtree->n.sym;
3575 /* If this ia a deferred TBP with an abstract interface
3576 (which may of course be referenced), c->expr1 will be set. */
3577 if (csym && csym->attr.abstract && !c->expr1)
3579 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3580 csym->name, &c->loc);
3584 /* Subroutines without the RECURSIVE attribution are not allowed to
3585 * call themselves. */
3586 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3588 if (csym->attr.entry && csym->ns->entries)
3589 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3590 " subroutine '%s' is not RECURSIVE",
3591 csym->name, &c->loc, csym->ns->entries->sym->name);
3593 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3594 " is not RECURSIVE", csym->name, &c->loc);
3599 /* Switch off assumed size checking and do this again for certain kinds
3600 of procedure, once the procedure itself is resolved. */
3601 need_full_assumed_size++;
3604 ptype = csym->attr.proc;
3606 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3607 if (resolve_actual_arglist (c->ext.actual, ptype,
3608 no_formal_args) == FAILURE)
3611 /* Resume assumed_size checking. */
3612 need_full_assumed_size--;
3614 /* If external, check for usage. */
3615 if (csym && is_external_proc (csym))
3616 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3619 if (c->resolved_sym == NULL)
3621 c->resolved_isym = NULL;
3622 switch (procedure_kind (csym))
3625 t = resolve_generic_s (c);
3628 case PTYPE_SPECIFIC:
3629 t = resolve_specific_s (c);
3633 t = resolve_unknown_s (c);
3637 gfc_internal_error ("resolve_subroutine(): bad function type");
3641 /* Some checks of elemental subroutine actual arguments. */
3642 if (resolve_elemental_actual (NULL, c) == FAILURE)
3649 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3650 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3651 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3652 if their shapes do not match. If either op1->shape or op2->shape is
3653 NULL, return SUCCESS. */
3656 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3663 if (op1->shape != NULL && op2->shape != NULL)
3665 for (i = 0; i < op1->rank; i++)
3667 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3669 gfc_error ("Shapes for operands at %L and %L are not conformable",
3670 &op1->where, &op2->where);
3681 /* Resolve an operator expression node. This can involve replacing the
3682 operation with a user defined function call. */
3685 resolve_operator (gfc_expr *e)
3687 gfc_expr *op1, *op2;
3689 bool dual_locus_error;
3692 /* Resolve all subnodes-- give them types. */
3694 switch (e->value.op.op)
3697 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3700 /* Fall through... */
3703 case INTRINSIC_UPLUS:
3704 case INTRINSIC_UMINUS:
3705 case INTRINSIC_PARENTHESES:
3706 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3711 /* Typecheck the new node. */
3713 op1 = e->value.op.op1;
3714 op2 = e->value.op.op2;
3715 dual_locus_error = false;
3717 if ((op1 && op1->expr_type == EXPR_NULL)
3718 || (op2 && op2->expr_type == EXPR_NULL))
3720 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3724 switch (e->value.op.op)
3726 case INTRINSIC_UPLUS:
3727 case INTRINSIC_UMINUS:
3728 if (op1->ts.type == BT_INTEGER
3729 || op1->ts.type == BT_REAL
3730 || op1->ts.type == BT_COMPLEX)
3736 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3737 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3740 case INTRINSIC_PLUS:
3741 case INTRINSIC_MINUS:
3742 case INTRINSIC_TIMES:
3743 case INTRINSIC_DIVIDE:
3744 case INTRINSIC_POWER:
3745 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3747 gfc_type_convert_binary (e, 1);
3752 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3753 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3754 gfc_typename (&op2->ts));
3757 case INTRINSIC_CONCAT:
3758 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3759 && op1->ts.kind == op2->ts.kind)
3761 e->ts.type = BT_CHARACTER;
3762 e->ts.kind = op1->ts.kind;
3767 _("Operands of string concatenation operator at %%L are %s/%s"),
3768 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3774 case INTRINSIC_NEQV:
3775 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3777 e->ts.type = BT_LOGICAL;
3778 e->ts.kind = gfc_kind_max (op1, op2);
3779 if (op1->ts.kind < e->ts.kind)
3780 gfc_convert_type (op1, &e->ts, 2);
3781 else if (op2->ts.kind < e->ts.kind)
3782 gfc_convert_type (op2, &e->ts, 2);
3786 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3787 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3788 gfc_typename (&op2->ts));
3793 if (op1->ts.type == BT_LOGICAL)
3795 e->ts.type = BT_LOGICAL;
3796 e->ts.kind = op1->ts.kind;
3800 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3801 gfc_typename (&op1->ts));
3805 case INTRINSIC_GT_OS:
3807 case INTRINSIC_GE_OS:
3809 case INTRINSIC_LT_OS:
3811 case INTRINSIC_LE_OS:
3812 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3814 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3818 /* Fall through... */
3821 case INTRINSIC_EQ_OS:
3823 case INTRINSIC_NE_OS:
3824 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3825 && op1->ts.kind == op2->ts.kind)
3827 e->ts.type = BT_LOGICAL;
3828 e->ts.kind = gfc_default_logical_kind;
3832 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3834 gfc_type_convert_binary (e, 1);
3836 e->ts.type = BT_LOGICAL;
3837 e->ts.kind = gfc_default_logical_kind;
3841 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3843 _("Logicals at %%L must be compared with %s instead of %s"),
3844 (e->value.op.op == INTRINSIC_EQ
3845 || e->value.op.op == INTRINSIC_EQ_OS)
3846 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3849 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3850 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3851 gfc_typename (&op2->ts));
3855 case INTRINSIC_USER:
3856 if (e->value.op.uop->op == NULL)
3857 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3858 else if (op2 == NULL)
3859 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3860 e->value.op.uop->name, gfc_typename (&op1->ts));
3863 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3864 e->value.op.uop->name, gfc_typename (&op1->ts),
3865 gfc_typename (&op2->ts));
3866 e->value.op.uop->op->sym->attr.referenced = 1;
3871 case INTRINSIC_PARENTHESES:
3873 if (e->ts.type == BT_CHARACTER)
3874 e->ts.u.cl = op1->ts.u.cl;
3878 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3881 /* Deal with arrayness of an operand through an operator. */
3885 switch (e->value.op.op)
3887 case INTRINSIC_PLUS:
3888 case INTRINSIC_MINUS:
3889 case INTRINSIC_TIMES:
3890 case INTRINSIC_DIVIDE:
3891 case INTRINSIC_POWER:
3892 case INTRINSIC_CONCAT:
3896 case INTRINSIC_NEQV:
3898 case INTRINSIC_EQ_OS:
3900 case INTRINSIC_NE_OS:
3902 case INTRINSIC_GT_OS:
3904 case INTRINSIC_GE_OS:
3906 case INTRINSIC_LT_OS:
3908 case INTRINSIC_LE_OS:
3910 if (op1->rank == 0 && op2->rank == 0)
3913 if (op1->rank == 0 && op2->rank != 0)
3915 e->rank = op2->rank;
3917 if (e->shape == NULL)
3918 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3921 if (op1->rank != 0 && op2->rank == 0)
3923 e->rank = op1->rank;
3925 if (e->shape == NULL)
3926 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3929 if (op1->rank != 0 && op2->rank != 0)
3931 if (op1->rank == op2->rank)
3933 e->rank = op1->rank;
3934 if (e->shape == NULL)
3936 t = compare_shapes (op1, op2);
3940 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3945 /* Allow higher level expressions to work. */
3948 /* Try user-defined operators, and otherwise throw an error. */
3949 dual_locus_error = true;
3951 _("Inconsistent ranks for operator at %%L and %%L"));
3958 case INTRINSIC_PARENTHESES:
3960 case INTRINSIC_UPLUS:
3961 case INTRINSIC_UMINUS:
3962 /* Simply copy arrayness attribute */
3963 e->rank = op1->rank;
3965 if (e->shape == NULL)
3966 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3974 /* Attempt to simplify the expression. */
3977 t = gfc_simplify_expr (e, 0);
3978 /* Some calls do not succeed in simplification and return FAILURE
3979 even though there is no error; e.g. variable references to
3980 PARAMETER arrays. */
3981 if (!gfc_is_constant_expr (e))
3990 if (gfc_extend_expr (e, &real_error) == SUCCESS)
3997 if (dual_locus_error)
3998 gfc_error (msg, &op1->where, &op2->where);
4000 gfc_error (msg, &e->where);
4006 /************** Array resolution subroutines **************/
4009 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
4012 /* Compare two integer expressions. */
4015 compare_bound (gfc_expr *a, gfc_expr *b)
4019 if (a == NULL || a->expr_type != EXPR_CONSTANT
4020 || b == NULL || b->expr_type != EXPR_CONSTANT)
4023 /* If either of the types isn't INTEGER, we must have
4024 raised an error earlier. */
4026 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
4029 i = mpz_cmp (a->value.integer, b->value.integer);
4039 /* Compare an integer expression with an integer. */
4042 compare_bound_int (gfc_expr *a, int b)
4046 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4049 if (a->ts.type != BT_INTEGER)
4050 gfc_internal_error ("compare_bound_int(): Bad expression");
4052 i = mpz_cmp_si (a->value.integer, b);
4062 /* Compare an integer expression with a mpz_t. */
4065 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
4069 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4072 if (a->ts.type != BT_INTEGER)
4073 gfc_internal_error ("compare_bound_int(): Bad expression");
4075 i = mpz_cmp (a->value.integer, b);
4085 /* Compute the last value of a sequence given by a triplet.
4086 Return 0 if it wasn't able to compute the last value, or if the
4087 sequence if empty, and 1 otherwise. */
4090 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
4091 gfc_expr *stride, mpz_t last)
4095 if (start == NULL || start->expr_type != EXPR_CONSTANT
4096 || end == NULL || end->expr_type != EXPR_CONSTANT
4097 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
4100 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
4101 || (stride != NULL && stride->ts.type != BT_INTEGER))
4104 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
4106 if (compare_bound (start, end) == CMP_GT)
4108 mpz_set (last, end->value.integer);
4112 if (compare_bound_int (stride, 0) == CMP_GT)
4114 /* Stride is positive */
4115 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
4120 /* Stride is negative */
4121 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
4126 mpz_sub (rem, end->value.integer, start->value.integer);
4127 mpz_tdiv_r (rem, rem, stride->value.integer);
4128 mpz_sub (last, end->value.integer, rem);
4135 /* Compare a single dimension of an array reference to the array
4139 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
4143 if (ar->dimen_type[i] == DIMEN_STAR)
4145 gcc_assert (ar->stride[i] == NULL);
4146 /* This implies [*] as [*:] and [*:3] are not possible. */
4147 if (ar->start[i] == NULL)
4149 gcc_assert (ar->end[i] == NULL);
4154 /* Given start, end and stride values, calculate the minimum and
4155 maximum referenced indexes. */
4157 switch (ar->dimen_type[i])
4160 case DIMEN_THIS_IMAGE:
4165 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
4168 gfc_warning ("Array reference at %L is out of bounds "
4169 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4170 mpz_get_si (ar->start[i]->value.integer),
4171 mpz_get_si (as->lower[i]->value.integer), i+1);
4173 gfc_warning ("Array reference at %L is out of bounds "
4174 "(%ld < %ld) in codimension %d", &ar->c_where[i],
4175 mpz_get_si (ar->start[i]->value.integer),
4176 mpz_get_si (as->lower[i]->value.integer),
4180 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
4183 gfc_warning ("Array reference at %L is out of bounds "
4184 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4185 mpz_get_si (ar->start[i]->value.integer),
4186 mpz_get_si (as->upper[i]->value.integer), i+1);
4188 gfc_warning ("Array reference at %L is out of bounds "
4189 "(%ld > %ld) in codimension %d", &ar->c_where[i],
4190 mpz_get_si (ar->start[i]->value.integer),
4191 mpz_get_si (as->upper[i]->value.integer),
4200 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
4201 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
4203 comparison comp_start_end = compare_bound (AR_START, AR_END);
4205 /* Check for zero stride, which is not allowed. */
4206 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
4208 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
4212 /* if start == len || (stride > 0 && start < len)
4213 || (stride < 0 && start > len),
4214 then the array section contains at least one element. In this
4215 case, there is an out-of-bounds access if
4216 (start < lower || start > upper). */
4217 if (compare_bound (AR_START, AR_END) == CMP_EQ
4218 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
4219 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
4220 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
4221 && comp_start_end == CMP_GT))
4223 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
4225 gfc_warning ("Lower array reference at %L is out of bounds "
4226 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4227 mpz_get_si (AR_START->value.integer),
4228 mpz_get_si (as->lower[i]->value.integer), i+1);
4231 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
4233 gfc_warning ("Lower array reference at %L is out of bounds "
4234 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4235 mpz_get_si (AR_START->value.integer),
4236 mpz_get_si (as->upper[i]->value.integer), i+1);
4241 /* If we can compute the highest index of the array section,
4242 then it also has to be between lower and upper. */
4243 mpz_init (last_value);
4244 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
4247 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
4249 gfc_warning ("Upper array reference at %L is out of bounds "
4250 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4251 mpz_get_si (last_value),
4252 mpz_get_si (as->lower[i]->value.integer), i+1);
4253 mpz_clear (last_value);
4256 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
4258 gfc_warning ("Upper array reference at %L is out of bounds "
4259 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4260 mpz_get_si (last_value),
4261 mpz_get_si (as->upper[i]->value.integer), i+1);
4262 mpz_clear (last_value);
4266 mpz_clear (last_value);
4274 gfc_internal_error ("check_dimension(): Bad array reference");
4281 /* Compare an array reference with an array specification. */
4284 compare_spec_to_ref (gfc_array_ref *ar)
4291 /* TODO: Full array sections are only allowed as actual parameters. */
4292 if (as->type == AS_ASSUMED_SIZE
4293 && (/*ar->type == AR_FULL
4294 ||*/ (ar->type == AR_SECTION
4295 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
4297 gfc_error ("Rightmost upper bound of assumed size array section "
4298 "not specified at %L", &ar->where);
4302 if (ar->type == AR_FULL)
4305 if (as->rank != ar->dimen)
4307 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
4308 &ar->where, ar->dimen, as->rank);
4312 /* ar->codimen == 0 is a local array. */
4313 if (as->corank != ar->codimen && ar->codimen != 0)
4315 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
4316 &ar->where, ar->codimen, as->corank);
4320 for (i = 0; i < as->rank; i++)
4321 if (check_dimension (i, ar, as) == FAILURE)
4324 /* Local access has no coarray spec. */
4325 if (ar->codimen != 0)
4326 for (i = as->rank; i < as->rank + as->corank; i++)
4328 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate
4329 && ar->dimen_type[i] != DIMEN_THIS_IMAGE)
4331 gfc_error ("Coindex of codimension %d must be a scalar at %L",
4332 i + 1 - as->rank, &ar->where);
4335 if (check_dimension (i, ar, as) == FAILURE)
4339 if (as->corank && ar->codimen == 0)
4342 ar->codimen = as->corank;
4343 for (n = ar->dimen; n < ar->dimen + ar->codimen; n++)
4344 ar->dimen_type[n] = DIMEN_THIS_IMAGE;
4351 /* Resolve one part of an array index. */
4354 gfc_resolve_index_1 (gfc_expr *index, int check_scalar,
4355 int force_index_integer_kind)
4362 if (gfc_resolve_expr (index) == FAILURE)
4365 if (check_scalar && index->rank != 0)
4367 gfc_error ("Array index at %L must be scalar", &index->where);
4371 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4373 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4374 &index->where, gfc_basic_typename (index->ts.type));
4378 if (index->ts.type == BT_REAL)
4379 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4380 &index->where) == FAILURE)
4383 if ((index->ts.kind != gfc_index_integer_kind
4384 && force_index_integer_kind)
4385 || index->ts.type != BT_INTEGER)
4388 ts.type = BT_INTEGER;
4389 ts.kind = gfc_index_integer_kind;
4391 gfc_convert_type_warn (index, &ts, 2, 0);
4397 /* Resolve one part of an array index. */
4400 gfc_resolve_index (gfc_expr *index, int check_scalar)
4402 return gfc_resolve_index_1 (index, check_scalar, 1);
4405 /* Resolve a dim argument to an intrinsic function. */
4408 gfc_resolve_dim_arg (gfc_expr *dim)
4413 if (gfc_resolve_expr (dim) == FAILURE)
4418 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4423 if (dim->ts.type != BT_INTEGER)
4425 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4429 if (dim->ts.kind != gfc_index_integer_kind)
4434 ts.type = BT_INTEGER;
4435 ts.kind = gfc_index_integer_kind;
4437 gfc_convert_type_warn (dim, &ts, 2, 0);
4443 /* Given an expression that contains array references, update those array
4444 references to point to the right array specifications. While this is
4445 filled in during matching, this information is difficult to save and load
4446 in a module, so we take care of it here.
4448 The idea here is that the original array reference comes from the
4449 base symbol. We traverse the list of reference structures, setting
4450 the stored reference to references. Component references can
4451 provide an additional array specification. */
4454 find_array_spec (gfc_expr *e)
4458 gfc_symbol *derived;
4461 if (e->symtree->n.sym->ts.type == BT_CLASS)
4462 as = CLASS_DATA (e->symtree->n.sym)->as;
4464 as = e->symtree->n.sym->as;
4467 for (ref = e->ref; ref; ref = ref->next)
4472 gfc_internal_error ("find_array_spec(): Missing spec");
4479 if (derived == NULL)
4480 derived = e->symtree->n.sym->ts.u.derived;
4482 if (derived->attr.is_class)
4483 derived = derived->components->ts.u.derived;
4485 c = derived->components;
4487 for (; c; c = c->next)
4488 if (c == ref->u.c.component)
4490 /* Track the sequence of component references. */
4491 if (c->ts.type == BT_DERIVED)
4492 derived = c->ts.u.derived;
4497 gfc_internal_error ("find_array_spec(): Component not found");
4499 if (c->attr.dimension)
4502 gfc_internal_error ("find_array_spec(): unused as(1)");
4513 gfc_internal_error ("find_array_spec(): unused as(2)");
4517 /* Resolve an array reference. */
4520 resolve_array_ref (gfc_array_ref *ar)
4522 int i, check_scalar;
4525 for (i = 0; i < ar->dimen + ar->codimen; i++)
4527 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4529 /* Do not force gfc_index_integer_kind for the start. We can
4530 do fine with any integer kind. This avoids temporary arrays
4531 created for indexing with a vector. */
4532 if (gfc_resolve_index_1 (ar->start[i], check_scalar, 0) == FAILURE)
4534 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4536 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4541 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4545 ar->dimen_type[i] = DIMEN_ELEMENT;
4549 ar->dimen_type[i] = DIMEN_VECTOR;
4550 if (e->expr_type == EXPR_VARIABLE
4551 && e->symtree->n.sym->ts.type == BT_DERIVED)
4552 ar->start[i] = gfc_get_parentheses (e);
4556 gfc_error ("Array index at %L is an array of rank %d",
4557 &ar->c_where[i], e->rank);
4561 /* Fill in the upper bound, which may be lower than the
4562 specified one for something like a(2:10:5), which is
4563 identical to a(2:7:5). Only relevant for strides not equal
4565 if (ar->dimen_type[i] == DIMEN_RANGE
4566 && ar->stride[i] != NULL && ar->stride[i]->expr_type == EXPR_CONSTANT
4567 && mpz_cmp_si (ar->stride[i]->value.integer, 1L) != 0)
4571 if (gfc_ref_dimen_size (ar, i, &size, &end) == SUCCESS)
4573 if (ar->end[i] == NULL)
4576 gfc_get_constant_expr (BT_INTEGER, gfc_index_integer_kind,
4578 mpz_set (ar->end[i]->value.integer, end);
4580 else if (ar->end[i]->ts.type == BT_INTEGER
4581 && ar->end[i]->expr_type == EXPR_CONSTANT)
4583 mpz_set (ar->end[i]->value.integer, end);
4594 if (ar->type == AR_FULL && ar->as->rank == 0)
4595 ar->type = AR_ELEMENT;
4597 /* If the reference type is unknown, figure out what kind it is. */
4599 if (ar->type == AR_UNKNOWN)
4601 ar->type = AR_ELEMENT;
4602 for (i = 0; i < ar->dimen; i++)
4603 if (ar->dimen_type[i] == DIMEN_RANGE
4604 || ar->dimen_type[i] == DIMEN_VECTOR)
4606 ar->type = AR_SECTION;
4611 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4619 resolve_substring (gfc_ref *ref)
4621 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4623 if (ref->u.ss.start != NULL)
4625 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4628 if (ref->u.ss.start->ts.type != BT_INTEGER)
4630 gfc_error ("Substring start index at %L must be of type INTEGER",
4631 &ref->u.ss.start->where);
4635 if (ref->u.ss.start->rank != 0)
4637 gfc_error ("Substring start index at %L must be scalar",
4638 &ref->u.ss.start->where);
4642 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4643 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4644 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4646 gfc_error ("Substring start index at %L is less than one",
4647 &ref->u.ss.start->where);
4652 if (ref->u.ss.end != NULL)
4654 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4657 if (ref->u.ss.end->ts.type != BT_INTEGER)
4659 gfc_error ("Substring end index at %L must be of type INTEGER",
4660 &ref->u.ss.end->where);
4664 if (ref->u.ss.end->rank != 0)
4666 gfc_error ("Substring end index at %L must be scalar",
4667 &ref->u.ss.end->where);
4671 if (ref->u.ss.length != NULL
4672 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4673 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4674 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4676 gfc_error ("Substring end index at %L exceeds the string length",
4677 &ref->u.ss.start->where);
4681 if (compare_bound_mpz_t (ref->u.ss.end,
4682 gfc_integer_kinds[k].huge) == CMP_GT
4683 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4684 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4686 gfc_error ("Substring end index at %L is too large",
4687 &ref->u.ss.end->where);
4696 /* This function supplies missing substring charlens. */
4699 gfc_resolve_substring_charlen (gfc_expr *e)
4702 gfc_expr *start, *end;
4704 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4705 if (char_ref->type == REF_SUBSTRING)
4711 gcc_assert (char_ref->next == NULL);
4715 if (e->ts.u.cl->length)
4716 gfc_free_expr (e->ts.u.cl->length);
4717 else if (e->expr_type == EXPR_VARIABLE
4718 && e->symtree->n.sym->attr.dummy)
4722 e->ts.type = BT_CHARACTER;
4723 e->ts.kind = gfc_default_character_kind;
4726 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4728 if (char_ref->u.ss.start)
4729 start = gfc_copy_expr (char_ref->u.ss.start);
4731 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4733 if (char_ref->u.ss.end)
4734 end = gfc_copy_expr (char_ref->u.ss.end);
4735 else if (e->expr_type == EXPR_VARIABLE)
4736 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4743 /* Length = (end - start +1). */
4744 e->ts.u.cl->length = gfc_subtract (end, start);
4745 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4746 gfc_get_int_expr (gfc_default_integer_kind,
4749 e->ts.u.cl->length->ts.type = BT_INTEGER;
4750 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4752 /* Make sure that the length is simplified. */
4753 gfc_simplify_expr (e->ts.u.cl->length, 1);
4754 gfc_resolve_expr (e->ts.u.cl->length);
4758 /* Resolve subtype references. */
4761 resolve_ref (gfc_expr *expr)
4763 int current_part_dimension, n_components, seen_part_dimension;
4766 for (ref = expr->ref; ref; ref = ref->next)
4767 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4769 find_array_spec (expr);
4773 for (ref = expr->ref; ref; ref = ref->next)
4777 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4785 resolve_substring (ref);
4789 /* Check constraints on part references. */
4791 current_part_dimension = 0;
4792 seen_part_dimension = 0;
4795 for (ref = expr->ref; ref; ref = ref->next)
4800 switch (ref->u.ar.type)
4803 /* Coarray scalar. */
4804 if (ref->u.ar.as->rank == 0)
4806 current_part_dimension = 0;
4811 current_part_dimension = 1;
4815 current_part_dimension = 0;
4819 gfc_internal_error ("resolve_ref(): Bad array reference");
4825 if (current_part_dimension || seen_part_dimension)
4828 if (ref->u.c.component->attr.pointer
4829 || ref->u.c.component->attr.proc_pointer)
4831 gfc_error ("Component to the right of a part reference "
4832 "with nonzero rank must not have the POINTER "
4833 "attribute at %L", &expr->where);
4836 else if (ref->u.c.component->attr.allocatable)
4838 gfc_error ("Component to the right of a part reference "
4839 "with nonzero rank must not have the ALLOCATABLE "
4840 "attribute at %L", &expr->where);
4852 if (((ref->type == REF_COMPONENT && n_components > 1)
4853 || ref->next == NULL)
4854 && current_part_dimension
4855 && seen_part_dimension)
4857 gfc_error ("Two or more part references with nonzero rank must "
4858 "not be specified at %L", &expr->where);
4862 if (ref->type == REF_COMPONENT)
4864 if (current_part_dimension)
4865 seen_part_dimension = 1;
4867 /* reset to make sure */
4868 current_part_dimension = 0;
4876 /* Given an expression, determine its shape. This is easier than it sounds.
4877 Leaves the shape array NULL if it is not possible to determine the shape. */
4880 expression_shape (gfc_expr *e)
4882 mpz_t array[GFC_MAX_DIMENSIONS];
4885 if (e->rank == 0 || e->shape != NULL)
4888 for (i = 0; i < e->rank; i++)
4889 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4892 e->shape = gfc_get_shape (e->rank);
4894 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4899 for (i--; i >= 0; i--)
4900 mpz_clear (array[i]);
4904 /* Given a variable expression node, compute the rank of the expression by
4905 examining the base symbol and any reference structures it may have. */
4908 expression_rank (gfc_expr *e)
4913 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4914 could lead to serious confusion... */
4915 gcc_assert (e->expr_type != EXPR_COMPCALL);
4919 if (e->expr_type == EXPR_ARRAY)
4921 /* Constructors can have a rank different from one via RESHAPE(). */
4923 if (e->symtree == NULL)
4929 e->rank = (e->symtree->n.sym->as == NULL)
4930 ? 0 : e->symtree->n.sym->as->rank;
4936 for (ref = e->ref; ref; ref = ref->next)
4938 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.proc_pointer
4939 && ref->u.c.component->attr.function && !ref->next)
4940 rank = ref->u.c.component->as ? ref->u.c.component->as->rank : 0;
4942 if (ref->type != REF_ARRAY)
4945 if (ref->u.ar.type == AR_FULL)
4947 rank = ref->u.ar.as->rank;
4951 if (ref->u.ar.type == AR_SECTION)
4953 /* Figure out the rank of the section. */
4955 gfc_internal_error ("expression_rank(): Two array specs");
4957 for (i = 0; i < ref->u.ar.dimen; i++)
4958 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4959 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4969 expression_shape (e);
4973 /* Resolve a variable expression. */
4976 resolve_variable (gfc_expr *e)
4983 if (e->symtree == NULL)
4985 sym = e->symtree->n.sym;
4987 /* If this is an associate-name, it may be parsed with an array reference
4988 in error even though the target is scalar. Fail directly in this case. */
4989 if (sym->assoc && !sym->attr.dimension && e->ref && e->ref->type == REF_ARRAY)
4992 /* On the other hand, the parser may not have known this is an array;
4993 in this case, we have to add a FULL reference. */
4994 if (sym->assoc && sym->attr.dimension && !e->ref)
4996 e->ref = gfc_get_ref ();
4997 e->ref->type = REF_ARRAY;
4998 e->ref->u.ar.type = AR_FULL;
4999 e->ref->u.ar.dimen = 0;
5002 if (e->ref && resolve_ref (e) == FAILURE)
5005 if (sym->attr.flavor == FL_PROCEDURE
5006 && (!sym->attr.function
5007 || (sym->attr.function && sym->result
5008 && sym->result->attr.proc_pointer
5009 && !sym->result->attr.function)))
5011 e->ts.type = BT_PROCEDURE;
5012 goto resolve_procedure;
5015 if (sym->ts.type != BT_UNKNOWN)
5016 gfc_variable_attr (e, &e->ts);
5019 /* Must be a simple variable reference. */
5020 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
5025 if (check_assumed_size_reference (sym, e))
5028 /* Deal with forward references to entries during resolve_code, to
5029 satisfy, at least partially, 12.5.2.5. */
5030 if (gfc_current_ns->entries
5031 && current_entry_id == sym->entry_id
5034 && cs_base->current->op != EXEC_ENTRY)
5036 gfc_entry_list *entry;
5037 gfc_formal_arglist *formal;
5041 /* If the symbol is a dummy... */
5042 if (sym->attr.dummy && sym->ns == gfc_current_ns)
5044 entry = gfc_current_ns->entries;
5047 /* ...test if the symbol is a parameter of previous entries. */
5048 for (; entry && entry->id <= current_entry_id; entry = entry->next)
5049 for (formal = entry->sym->formal; formal; formal = formal->next)
5051 if (formal->sym && sym->name == formal->sym->name)
5055 /* If it has not been seen as a dummy, this is an error. */
5058 if (specification_expr)
5059 gfc_error ("Variable '%s', used in a specification expression"
5060 ", is referenced at %L before the ENTRY statement "
5061 "in which it is a parameter",
5062 sym->name, &cs_base->current->loc);
5064 gfc_error ("Variable '%s' is used at %L before the ENTRY "
5065 "statement in which it is a parameter",
5066 sym->name, &cs_base->current->loc);
5071 /* Now do the same check on the specification expressions. */
5072 specification_expr = 1;
5073 if (sym->ts.type == BT_CHARACTER
5074 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
5078 for (n = 0; n < sym->as->rank; n++)
5080 specification_expr = 1;
5081 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
5083 specification_expr = 1;
5084 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
5087 specification_expr = 0;
5090 /* Update the symbol's entry level. */
5091 sym->entry_id = current_entry_id + 1;
5094 /* If a symbol has been host_associated mark it. This is used latter,
5095 to identify if aliasing is possible via host association. */
5096 if (sym->attr.flavor == FL_VARIABLE
5097 && gfc_current_ns->parent
5098 && (gfc_current_ns->parent == sym->ns
5099 || (gfc_current_ns->parent->parent
5100 && gfc_current_ns->parent->parent == sym->ns)))
5101 sym->attr.host_assoc = 1;
5104 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
5107 /* F2008, C617 and C1229. */
5108 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
5109 && gfc_is_coindexed (e))
5111 gfc_ref *ref, *ref2 = NULL;
5113 for (ref = e->ref; ref; ref = ref->next)
5115 if (ref->type == REF_COMPONENT)
5117 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
5121 for ( ; ref; ref = ref->next)
5122 if (ref->type == REF_COMPONENT)
5125 /* Expression itself is not coindexed object. */
5126 if (ref && e->ts.type == BT_CLASS)
5128 gfc_error ("Polymorphic subobject of coindexed object at %L",
5133 /* Expression itself is coindexed object. */
5137 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
5138 for ( ; c; c = c->next)
5139 if (c->attr.allocatable && c->ts.type == BT_CLASS)
5141 gfc_error ("Coindexed object with polymorphic allocatable "
5142 "subcomponent at %L", &e->where);
5153 /* Checks to see that the correct symbol has been host associated.
5154 The only situation where this arises is that in which a twice
5155 contained function is parsed after the host association is made.
5156 Therefore, on detecting this, change the symbol in the expression
5157 and convert the array reference into an actual arglist if the old
5158 symbol is a variable. */
5160 check_host_association (gfc_expr *e)
5162 gfc_symbol *sym, *old_sym;
5166 gfc_actual_arglist *arg, *tail = NULL;
5167 bool retval = e->expr_type == EXPR_FUNCTION;
5169 /* If the expression is the result of substitution in
5170 interface.c(gfc_extend_expr) because there is no way in
5171 which the host association can be wrong. */
5172 if (e->symtree == NULL
5173 || e->symtree->n.sym == NULL
5174 || e->user_operator)
5177 old_sym = e->symtree->n.sym;
5179 if (gfc_current_ns->parent
5180 && old_sym->ns != gfc_current_ns)
5182 /* Use the 'USE' name so that renamed module symbols are
5183 correctly handled. */
5184 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
5186 if (sym && old_sym != sym
5187 && sym->ts.type == old_sym->ts.type
5188 && sym->attr.flavor == FL_PROCEDURE
5189 && sym->attr.contained)
5191 /* Clear the shape, since it might not be valid. */
5192 if (e->shape != NULL)
5194 for (n = 0; n < e->rank; n++)
5195 mpz_clear (e->shape[n]);
5197 gfc_free (e->shape);
5200 /* Give the expression the right symtree! */
5201 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
5202 gcc_assert (st != NULL);
5204 if (old_sym->attr.flavor == FL_PROCEDURE
5205 || e->expr_type == EXPR_FUNCTION)
5207 /* Original was function so point to the new symbol, since
5208 the actual argument list is already attached to the
5210 e->value.function.esym = NULL;
5215 /* Original was variable so convert array references into
5216 an actual arglist. This does not need any checking now
5217 since gfc_resolve_function will take care of it. */
5218 e->value.function.actual = NULL;
5219 e->expr_type = EXPR_FUNCTION;
5222 /* Ambiguity will not arise if the array reference is not
5223 the last reference. */
5224 for (ref = e->ref; ref; ref = ref->next)
5225 if (ref->type == REF_ARRAY && ref->next == NULL)
5228 gcc_assert (ref->type == REF_ARRAY);
5230 /* Grab the start expressions from the array ref and
5231 copy them into actual arguments. */
5232 for (n = 0; n < ref->u.ar.dimen; n++)
5234 arg = gfc_get_actual_arglist ();
5235 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
5236 if (e->value.function.actual == NULL)
5237 tail = e->value.function.actual = arg;
5245 /* Dump the reference list and set the rank. */
5246 gfc_free_ref_list (e->ref);
5248 e->rank = sym->as ? sym->as->rank : 0;
5251 gfc_resolve_expr (e);
5255 /* This might have changed! */
5256 return e->expr_type == EXPR_FUNCTION;
5261 gfc_resolve_character_operator (gfc_expr *e)
5263 gfc_expr *op1 = e->value.op.op1;
5264 gfc_expr *op2 = e->value.op.op2;
5265 gfc_expr *e1 = NULL;
5266 gfc_expr *e2 = NULL;
5268 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
5270 if (op1->ts.u.cl && op1->ts.u.cl->length)
5271 e1 = gfc_copy_expr (op1->ts.u.cl->length);
5272 else if (op1->expr_type == EXPR_CONSTANT)
5273 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5274 op1->value.character.length);
5276 if (op2->ts.u.cl && op2->ts.u.cl->length)
5277 e2 = gfc_copy_expr (op2->ts.u.cl->length);
5278 else if (op2->expr_type == EXPR_CONSTANT)
5279 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5280 op2->value.character.length);
5282 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5287 e->ts.u.cl->length = gfc_add (e1, e2);
5288 e->ts.u.cl->length->ts.type = BT_INTEGER;
5289 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
5290 gfc_simplify_expr (e->ts.u.cl->length, 0);
5291 gfc_resolve_expr (e->ts.u.cl->length);
5297 /* Ensure that an character expression has a charlen and, if possible, a
5298 length expression. */
5301 fixup_charlen (gfc_expr *e)
5303 /* The cases fall through so that changes in expression type and the need
5304 for multiple fixes are picked up. In all circumstances, a charlen should
5305 be available for the middle end to hang a backend_decl on. */
5306 switch (e->expr_type)
5309 gfc_resolve_character_operator (e);
5312 if (e->expr_type == EXPR_ARRAY)
5313 gfc_resolve_character_array_constructor (e);
5315 case EXPR_SUBSTRING:
5316 if (!e->ts.u.cl && e->ref)
5317 gfc_resolve_substring_charlen (e);
5321 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5328 /* Update an actual argument to include the passed-object for type-bound
5329 procedures at the right position. */
5331 static gfc_actual_arglist*
5332 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
5335 gcc_assert (argpos > 0);
5339 gfc_actual_arglist* result;
5341 result = gfc_get_actual_arglist ();
5345 result->name = name;
5351 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
5353 lst = update_arglist_pass (NULL, po, argpos - 1, name);
5358 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
5361 extract_compcall_passed_object (gfc_expr* e)
5365 gcc_assert (e->expr_type == EXPR_COMPCALL);
5367 if (e->value.compcall.base_object)
5368 po = gfc_copy_expr (e->value.compcall.base_object);
5371 po = gfc_get_expr ();
5372 po->expr_type = EXPR_VARIABLE;
5373 po->symtree = e->symtree;
5374 po->ref = gfc_copy_ref (e->ref);
5375 po->where = e->where;
5378 if (gfc_resolve_expr (po) == FAILURE)
5385 /* Update the arglist of an EXPR_COMPCALL expression to include the
5389 update_compcall_arglist (gfc_expr* e)
5392 gfc_typebound_proc* tbp;
5394 tbp = e->value.compcall.tbp;
5399 po = extract_compcall_passed_object (e);
5403 if (tbp->nopass || e->value.compcall.ignore_pass)
5409 gcc_assert (tbp->pass_arg_num > 0);
5410 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5418 /* Extract the passed object from a PPC call (a copy of it). */
5421 extract_ppc_passed_object (gfc_expr *e)
5426 po = gfc_get_expr ();
5427 po->expr_type = EXPR_VARIABLE;
5428 po->symtree = e->symtree;
5429 po->ref = gfc_copy_ref (e->ref);
5430 po->where = e->where;
5432 /* Remove PPC reference. */
5434 while ((*ref)->next)
5435 ref = &(*ref)->next;
5436 gfc_free_ref_list (*ref);
5439 if (gfc_resolve_expr (po) == FAILURE)
5446 /* Update the actual arglist of a procedure pointer component to include the
5450 update_ppc_arglist (gfc_expr* e)
5454 gfc_typebound_proc* tb;
5456 if (!gfc_is_proc_ptr_comp (e, &ppc))
5463 else if (tb->nopass)
5466 po = extract_ppc_passed_object (e);
5473 gfc_error ("Passed-object at %L must be scalar", &e->where);
5478 if (po->ts.type == BT_DERIVED && po->ts.u.derived->attr.abstract)
5480 gfc_error ("Base object for procedure-pointer component call at %L is of"
5481 " ABSTRACT type '%s'", &e->where, po->ts.u.derived->name);
5485 gcc_assert (tb->pass_arg_num > 0);
5486 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5494 /* Check that the object a TBP is called on is valid, i.e. it must not be
5495 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5498 check_typebound_baseobject (gfc_expr* e)
5501 gfc_try return_value = FAILURE;
5503 base = extract_compcall_passed_object (e);
5507 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5510 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5512 gfc_error ("Base object for type-bound procedure call at %L is of"
5513 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5517 /* F08:C1230. If the procedure called is NOPASS,
5518 the base object must be scalar. */
5519 if (e->value.compcall.tbp->nopass && base->rank > 0)
5521 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5522 " be scalar", &e->where);
5526 /* FIXME: Remove once PR 43214 is fixed (TBP with non-scalar PASS). */
5529 gfc_error ("Non-scalar base object at %L currently not implemented",
5534 return_value = SUCCESS;
5537 gfc_free_expr (base);
5538 return return_value;
5542 /* Resolve a call to a type-bound procedure, either function or subroutine,
5543 statically from the data in an EXPR_COMPCALL expression. The adapted
5544 arglist and the target-procedure symtree are returned. */
5547 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5548 gfc_actual_arglist** actual)
5550 gcc_assert (e->expr_type == EXPR_COMPCALL);
5551 gcc_assert (!e->value.compcall.tbp->is_generic);
5553 /* Update the actual arglist for PASS. */
5554 if (update_compcall_arglist (e) == FAILURE)
5557 *actual = e->value.compcall.actual;
5558 *target = e->value.compcall.tbp->u.specific;
5560 gfc_free_ref_list (e->ref);
5562 e->value.compcall.actual = NULL;
5568 /* Get the ultimate declared type from an expression. In addition,
5569 return the last class/derived type reference and the copy of the
5572 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5575 gfc_symbol *declared;
5582 *new_ref = gfc_copy_ref (e->ref);
5584 for (ref = e->ref; ref; ref = ref->next)
5586 if (ref->type != REF_COMPONENT)
5589 if (ref->u.c.component->ts.type == BT_CLASS
5590 || ref->u.c.component->ts.type == BT_DERIVED)
5592 declared = ref->u.c.component->ts.u.derived;
5598 if (declared == NULL)
5599 declared = e->symtree->n.sym->ts.u.derived;
5605 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5606 which of the specific bindings (if any) matches the arglist and transform
5607 the expression into a call of that binding. */
5610 resolve_typebound_generic_call (gfc_expr* e, const char **name)
5612 gfc_typebound_proc* genproc;
5613 const char* genname;
5615 gfc_symbol *derived;
5617 gcc_assert (e->expr_type == EXPR_COMPCALL);
5618 genname = e->value.compcall.name;
5619 genproc = e->value.compcall.tbp;
5621 if (!genproc->is_generic)
5624 /* Try the bindings on this type and in the inheritance hierarchy. */
5625 for (; genproc; genproc = genproc->overridden)
5629 gcc_assert (genproc->is_generic);
5630 for (g = genproc->u.generic; g; g = g->next)
5633 gfc_actual_arglist* args;
5636 gcc_assert (g->specific);
5638 if (g->specific->error)
5641 target = g->specific->u.specific->n.sym;
5643 /* Get the right arglist by handling PASS/NOPASS. */
5644 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5645 if (!g->specific->nopass)
5648 po = extract_compcall_passed_object (e);
5652 gcc_assert (g->specific->pass_arg_num > 0);
5653 gcc_assert (!g->specific->error);
5654 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5655 g->specific->pass_arg);
5657 resolve_actual_arglist (args, target->attr.proc,
5658 is_external_proc (target) && !target->formal);
5660 /* Check if this arglist matches the formal. */
5661 matches = gfc_arglist_matches_symbol (&args, target);
5663 /* Clean up and break out of the loop if we've found it. */
5664 gfc_free_actual_arglist (args);
5667 e->value.compcall.tbp = g->specific;
5668 genname = g->specific_st->name;
5669 /* Pass along the name for CLASS methods, where the vtab
5670 procedure pointer component has to be referenced. */
5678 /* Nothing matching found! */
5679 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5680 " '%s' at %L", genname, &e->where);
5684 /* Make sure that we have the right specific instance for the name. */
5685 derived = get_declared_from_expr (NULL, NULL, e);
5687 st = gfc_find_typebound_proc (derived, NULL, genname, false, &e->where);
5689 e->value.compcall.tbp = st->n.tb;
5695 /* Resolve a call to a type-bound subroutine. */
5698 resolve_typebound_call (gfc_code* c, const char **name)
5700 gfc_actual_arglist* newactual;
5701 gfc_symtree* target;
5703 /* Check that's really a SUBROUTINE. */
5704 if (!c->expr1->value.compcall.tbp->subroutine)
5706 gfc_error ("'%s' at %L should be a SUBROUTINE",
5707 c->expr1->value.compcall.name, &c->loc);
5711 if (check_typebound_baseobject (c->expr1) == FAILURE)
5714 /* Pass along the name for CLASS methods, where the vtab
5715 procedure pointer component has to be referenced. */
5717 *name = c->expr1->value.compcall.name;
5719 if (resolve_typebound_generic_call (c->expr1, name) == FAILURE)
5722 /* Transform into an ordinary EXEC_CALL for now. */
5724 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5727 c->ext.actual = newactual;
5728 c->symtree = target;
5729 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5731 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5733 gfc_free_expr (c->expr1);
5734 c->expr1 = gfc_get_expr ();
5735 c->expr1->expr_type = EXPR_FUNCTION;
5736 c->expr1->symtree = target;
5737 c->expr1->where = c->loc;
5739 return resolve_call (c);
5743 /* Resolve a component-call expression. */
5745 resolve_compcall (gfc_expr* e, const char **name)
5747 gfc_actual_arglist* newactual;
5748 gfc_symtree* target;
5750 /* Check that's really a FUNCTION. */
5751 if (!e->value.compcall.tbp->function)
5753 gfc_error ("'%s' at %L should be a FUNCTION",
5754 e->value.compcall.name, &e->where);
5758 /* These must not be assign-calls! */
5759 gcc_assert (!e->value.compcall.assign);
5761 if (check_typebound_baseobject (e) == FAILURE)
5764 /* Pass along the name for CLASS methods, where the vtab
5765 procedure pointer component has to be referenced. */
5767 *name = e->value.compcall.name;
5769 if (resolve_typebound_generic_call (e, name) == FAILURE)
5771 gcc_assert (!e->value.compcall.tbp->is_generic);
5773 /* Take the rank from the function's symbol. */
5774 if (e->value.compcall.tbp->u.specific->n.sym->as)
5775 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5777 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5778 arglist to the TBP's binding target. */
5780 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5783 e->value.function.actual = newactual;
5784 e->value.function.name = NULL;
5785 e->value.function.esym = target->n.sym;
5786 e->value.function.isym = NULL;
5787 e->symtree = target;
5788 e->ts = target->n.sym->ts;
5789 e->expr_type = EXPR_FUNCTION;
5791 /* Resolution is not necessary if this is a class subroutine; this
5792 function only has to identify the specific proc. Resolution of
5793 the call will be done next in resolve_typebound_call. */
5794 return gfc_resolve_expr (e);
5799 /* Resolve a typebound function, or 'method'. First separate all
5800 the non-CLASS references by calling resolve_compcall directly. */
5803 resolve_typebound_function (gfc_expr* e)
5805 gfc_symbol *declared;
5816 /* Deal with typebound operators for CLASS objects. */
5817 expr = e->value.compcall.base_object;
5818 if (expr && expr->ts.type == BT_CLASS && e->value.compcall.name)
5820 /* Since the typebound operators are generic, we have to ensure
5821 that any delays in resolution are corrected and that the vtab
5824 declared = ts.u.derived;
5825 c = gfc_find_component (declared, "_vptr", true, true);
5826 if (c->ts.u.derived == NULL)
5827 c->ts.u.derived = gfc_find_derived_vtab (declared);
5829 if (resolve_compcall (e, &name) == FAILURE)
5832 /* Use the generic name if it is there. */
5833 name = name ? name : e->value.function.esym->name;
5834 e->symtree = expr->symtree;
5835 e->ref = gfc_copy_ref (expr->ref);
5836 gfc_add_vptr_component (e);
5837 gfc_add_component_ref (e, name);
5838 e->value.function.esym = NULL;
5843 return resolve_compcall (e, NULL);
5845 if (resolve_ref (e) == FAILURE)
5848 /* Get the CLASS declared type. */
5849 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5851 /* Weed out cases of the ultimate component being a derived type. */
5852 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5853 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5855 gfc_free_ref_list (new_ref);
5856 return resolve_compcall (e, NULL);
5859 c = gfc_find_component (declared, "_data", true, true);
5860 declared = c->ts.u.derived;
5862 /* Treat the call as if it is a typebound procedure, in order to roll
5863 out the correct name for the specific function. */
5864 if (resolve_compcall (e, &name) == FAILURE)
5868 /* Then convert the expression to a procedure pointer component call. */
5869 e->value.function.esym = NULL;
5875 /* '_vptr' points to the vtab, which contains the procedure pointers. */
5876 gfc_add_vptr_component (e);
5877 gfc_add_component_ref (e, name);
5879 /* Recover the typespec for the expression. This is really only
5880 necessary for generic procedures, where the additional call
5881 to gfc_add_component_ref seems to throw the collection of the
5882 correct typespec. */
5887 /* Resolve a typebound subroutine, or 'method'. First separate all
5888 the non-CLASS references by calling resolve_typebound_call
5892 resolve_typebound_subroutine (gfc_code *code)
5894 gfc_symbol *declared;
5903 st = code->expr1->symtree;
5905 /* Deal with typebound operators for CLASS objects. */
5906 expr = code->expr1->value.compcall.base_object;
5907 if (expr && expr->ts.type == BT_CLASS && code->expr1->value.compcall.name)
5909 /* Since the typebound operators are generic, we have to ensure
5910 that any delays in resolution are corrected and that the vtab
5912 declared = expr->ts.u.derived;
5913 c = gfc_find_component (declared, "_vptr", true, true);
5914 if (c->ts.u.derived == NULL)
5915 c->ts.u.derived = gfc_find_derived_vtab (declared);
5917 if (resolve_typebound_call (code, &name) == FAILURE)
5920 /* Use the generic name if it is there. */
5921 name = name ? name : code->expr1->value.function.esym->name;
5922 code->expr1->symtree = expr->symtree;
5923 code->expr1->ref = gfc_copy_ref (expr->ref);
5924 gfc_add_vptr_component (code->expr1);
5925 gfc_add_component_ref (code->expr1, name);
5926 code->expr1->value.function.esym = NULL;
5931 return resolve_typebound_call (code, NULL);
5933 if (resolve_ref (code->expr1) == FAILURE)
5936 /* Get the CLASS declared type. */
5937 get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5939 /* Weed out cases of the ultimate component being a derived type. */
5940 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5941 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5943 gfc_free_ref_list (new_ref);
5944 return resolve_typebound_call (code, NULL);
5947 if (resolve_typebound_call (code, &name) == FAILURE)
5949 ts = code->expr1->ts;
5951 /* Then convert the expression to a procedure pointer component call. */
5952 code->expr1->value.function.esym = NULL;
5953 code->expr1->symtree = st;
5956 code->expr1->ref = new_ref;
5958 /* '_vptr' points to the vtab, which contains the procedure pointers. */
5959 gfc_add_vptr_component (code->expr1);
5960 gfc_add_component_ref (code->expr1, name);
5962 /* Recover the typespec for the expression. This is really only
5963 necessary for generic procedures, where the additional call
5964 to gfc_add_component_ref seems to throw the collection of the
5965 correct typespec. */
5966 code->expr1->ts = ts;
5971 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5974 resolve_ppc_call (gfc_code* c)
5976 gfc_component *comp;
5979 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5982 c->resolved_sym = c->expr1->symtree->n.sym;
5983 c->expr1->expr_type = EXPR_VARIABLE;
5985 if (!comp->attr.subroutine)
5986 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5988 if (resolve_ref (c->expr1) == FAILURE)
5991 if (update_ppc_arglist (c->expr1) == FAILURE)
5994 c->ext.actual = c->expr1->value.compcall.actual;
5996 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5997 comp->formal == NULL) == FAILURE)
6000 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
6006 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
6009 resolve_expr_ppc (gfc_expr* e)
6011 gfc_component *comp;
6014 b = gfc_is_proc_ptr_comp (e, &comp);
6017 /* Convert to EXPR_FUNCTION. */
6018 e->expr_type = EXPR_FUNCTION;
6019 e->value.function.isym = NULL;
6020 e->value.function.actual = e->value.compcall.actual;
6022 if (comp->as != NULL)
6023 e->rank = comp->as->rank;
6025 if (!comp->attr.function)
6026 gfc_add_function (&comp->attr, comp->name, &e->where);
6028 if (resolve_ref (e) == FAILURE)
6031 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
6032 comp->formal == NULL) == FAILURE)
6035 if (update_ppc_arglist (e) == FAILURE)
6038 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
6045 gfc_is_expandable_expr (gfc_expr *e)
6047 gfc_constructor *con;
6049 if (e->expr_type == EXPR_ARRAY)
6051 /* Traverse the constructor looking for variables that are flavor
6052 parameter. Parameters must be expanded since they are fully used at
6054 con = gfc_constructor_first (e->value.constructor);
6055 for (; con; con = gfc_constructor_next (con))
6057 if (con->expr->expr_type == EXPR_VARIABLE
6058 && con->expr->symtree
6059 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
6060 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
6062 if (con->expr->expr_type == EXPR_ARRAY
6063 && gfc_is_expandable_expr (con->expr))
6071 /* Resolve an expression. That is, make sure that types of operands agree
6072 with their operators, intrinsic operators are converted to function calls
6073 for overloaded types and unresolved function references are resolved. */
6076 gfc_resolve_expr (gfc_expr *e)
6084 /* inquiry_argument only applies to variables. */
6085 inquiry_save = inquiry_argument;
6086 if (e->expr_type != EXPR_VARIABLE)
6087 inquiry_argument = false;
6089 switch (e->expr_type)
6092 t = resolve_operator (e);
6098 if (check_host_association (e))
6099 t = resolve_function (e);
6102 t = resolve_variable (e);
6104 expression_rank (e);
6107 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
6108 && e->ref->type != REF_SUBSTRING)
6109 gfc_resolve_substring_charlen (e);
6114 t = resolve_typebound_function (e);
6117 case EXPR_SUBSTRING:
6118 t = resolve_ref (e);
6127 t = resolve_expr_ppc (e);
6132 if (resolve_ref (e) == FAILURE)
6135 t = gfc_resolve_array_constructor (e);
6136 /* Also try to expand a constructor. */
6139 expression_rank (e);
6140 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
6141 gfc_expand_constructor (e, false);
6144 /* This provides the opportunity for the length of constructors with
6145 character valued function elements to propagate the string length
6146 to the expression. */
6147 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
6149 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
6150 here rather then add a duplicate test for it above. */
6151 gfc_expand_constructor (e, false);
6152 t = gfc_resolve_character_array_constructor (e);
6157 case EXPR_STRUCTURE:
6158 t = resolve_ref (e);
6162 t = resolve_structure_cons (e, 0);
6166 t = gfc_simplify_expr (e, 0);
6170 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
6173 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
6176 inquiry_argument = inquiry_save;
6182 /* Resolve an expression from an iterator. They must be scalar and have
6183 INTEGER or (optionally) REAL type. */
6186 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
6187 const char *name_msgid)
6189 if (gfc_resolve_expr (expr) == FAILURE)
6192 if (expr->rank != 0)
6194 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
6198 if (expr->ts.type != BT_INTEGER)
6200 if (expr->ts.type == BT_REAL)
6203 return gfc_notify_std (GFC_STD_F95_DEL,
6204 "Deleted feature: %s at %L must be integer",
6205 _(name_msgid), &expr->where);
6208 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
6215 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
6223 /* Resolve the expressions in an iterator structure. If REAL_OK is
6224 false allow only INTEGER type iterators, otherwise allow REAL types. */
6227 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
6229 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
6233 if (gfc_check_vardef_context (iter->var, false, _("iterator variable"))
6237 if (gfc_resolve_iterator_expr (iter->start, real_ok,
6238 "Start expression in DO loop") == FAILURE)
6241 if (gfc_resolve_iterator_expr (iter->end, real_ok,
6242 "End expression in DO loop") == FAILURE)
6245 if (gfc_resolve_iterator_expr (iter->step, real_ok,
6246 "Step expression in DO loop") == FAILURE)
6249 if (iter->step->expr_type == EXPR_CONSTANT)
6251 if ((iter->step->ts.type == BT_INTEGER
6252 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
6253 || (iter->step->ts.type == BT_REAL
6254 && mpfr_sgn (iter->step->value.real) == 0))
6256 gfc_error ("Step expression in DO loop at %L cannot be zero",
6257 &iter->step->where);
6262 /* Convert start, end, and step to the same type as var. */
6263 if (iter->start->ts.kind != iter->var->ts.kind
6264 || iter->start->ts.type != iter->var->ts.type)
6265 gfc_convert_type (iter->start, &iter->var->ts, 2);
6267 if (iter->end->ts.kind != iter->var->ts.kind
6268 || iter->end->ts.type != iter->var->ts.type)
6269 gfc_convert_type (iter->end, &iter->var->ts, 2);
6271 if (iter->step->ts.kind != iter->var->ts.kind
6272 || iter->step->ts.type != iter->var->ts.type)
6273 gfc_convert_type (iter->step, &iter->var->ts, 2);
6275 if (iter->start->expr_type == EXPR_CONSTANT
6276 && iter->end->expr_type == EXPR_CONSTANT
6277 && iter->step->expr_type == EXPR_CONSTANT)
6280 if (iter->start->ts.type == BT_INTEGER)
6282 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
6283 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
6287 sgn = mpfr_sgn (iter->step->value.real);
6288 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
6290 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
6291 gfc_warning ("DO loop at %L will be executed zero times",
6292 &iter->step->where);
6299 /* Traversal function for find_forall_index. f == 2 signals that
6300 that variable itself is not to be checked - only the references. */
6303 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
6305 if (expr->expr_type != EXPR_VARIABLE)
6308 /* A scalar assignment */
6309 if (!expr->ref || *f == 1)
6311 if (expr->symtree->n.sym == sym)
6323 /* Check whether the FORALL index appears in the expression or not.
6324 Returns SUCCESS if SYM is found in EXPR. */
6327 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
6329 if (gfc_traverse_expr (expr, sym, forall_index, f))
6336 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
6337 to be a scalar INTEGER variable. The subscripts and stride are scalar
6338 INTEGERs, and if stride is a constant it must be nonzero.
6339 Furthermore "A subscript or stride in a forall-triplet-spec shall
6340 not contain a reference to any index-name in the
6341 forall-triplet-spec-list in which it appears." (7.5.4.1) */
6344 resolve_forall_iterators (gfc_forall_iterator *it)
6346 gfc_forall_iterator *iter, *iter2;
6348 for (iter = it; iter; iter = iter->next)
6350 if (gfc_resolve_expr (iter->var) == SUCCESS
6351 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
6352 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
6355 if (gfc_resolve_expr (iter->start) == SUCCESS
6356 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
6357 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
6358 &iter->start->where);
6359 if (iter->var->ts.kind != iter->start->ts.kind)
6360 gfc_convert_type (iter->start, &iter->var->ts, 2);
6362 if (gfc_resolve_expr (iter->end) == SUCCESS
6363 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
6364 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
6366 if (iter->var->ts.kind != iter->end->ts.kind)
6367 gfc_convert_type (iter->end, &iter->var->ts, 2);
6369 if (gfc_resolve_expr (iter->stride) == SUCCESS)
6371 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
6372 gfc_error ("FORALL stride expression at %L must be a scalar %s",
6373 &iter->stride->where, "INTEGER");
6375 if (iter->stride->expr_type == EXPR_CONSTANT
6376 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
6377 gfc_error ("FORALL stride expression at %L cannot be zero",
6378 &iter->stride->where);
6380 if (iter->var->ts.kind != iter->stride->ts.kind)
6381 gfc_convert_type (iter->stride, &iter->var->ts, 2);
6384 for (iter = it; iter; iter = iter->next)
6385 for (iter2 = iter; iter2; iter2 = iter2->next)
6387 if (find_forall_index (iter2->start,
6388 iter->var->symtree->n.sym, 0) == SUCCESS
6389 || find_forall_index (iter2->end,
6390 iter->var->symtree->n.sym, 0) == SUCCESS
6391 || find_forall_index (iter2->stride,
6392 iter->var->symtree->n.sym, 0) == SUCCESS)
6393 gfc_error ("FORALL index '%s' may not appear in triplet "
6394 "specification at %L", iter->var->symtree->name,
6395 &iter2->start->where);
6400 /* Given a pointer to a symbol that is a derived type, see if it's
6401 inaccessible, i.e. if it's defined in another module and the components are
6402 PRIVATE. The search is recursive if necessary. Returns zero if no
6403 inaccessible components are found, nonzero otherwise. */
6406 derived_inaccessible (gfc_symbol *sym)
6410 if (sym->attr.use_assoc && sym->attr.private_comp)
6413 for (c = sym->components; c; c = c->next)
6415 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
6423 /* Resolve the argument of a deallocate expression. The expression must be
6424 a pointer or a full array. */
6427 resolve_deallocate_expr (gfc_expr *e)
6429 symbol_attribute attr;
6430 int allocatable, pointer;
6435 if (gfc_resolve_expr (e) == FAILURE)
6438 if (e->expr_type != EXPR_VARIABLE)
6441 sym = e->symtree->n.sym;
6443 if (sym->ts.type == BT_CLASS)
6445 allocatable = CLASS_DATA (sym)->attr.allocatable;
6446 pointer = CLASS_DATA (sym)->attr.class_pointer;
6450 allocatable = sym->attr.allocatable;
6451 pointer = sym->attr.pointer;
6453 for (ref = e->ref; ref; ref = ref->next)
6458 if (ref->u.ar.type != AR_FULL)
6463 c = ref->u.c.component;
6464 if (c->ts.type == BT_CLASS)
6466 allocatable = CLASS_DATA (c)->attr.allocatable;
6467 pointer = CLASS_DATA (c)->attr.class_pointer;
6471 allocatable = c->attr.allocatable;
6472 pointer = c->attr.pointer;
6482 attr = gfc_expr_attr (e);
6484 if (allocatable == 0 && attr.pointer == 0)
6487 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6493 && gfc_check_vardef_context (e, true, _("DEALLOCATE object")) == FAILURE)
6495 if (gfc_check_vardef_context (e, false, _("DEALLOCATE object")) == FAILURE)
6502 /* Returns true if the expression e contains a reference to the symbol sym. */
6504 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6506 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6513 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6515 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6519 /* Given the expression node e for an allocatable/pointer of derived type to be
6520 allocated, get the expression node to be initialized afterwards (needed for
6521 derived types with default initializers, and derived types with allocatable
6522 components that need nullification.) */
6525 gfc_expr_to_initialize (gfc_expr *e)
6531 result = gfc_copy_expr (e);
6533 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6534 for (ref = result->ref; ref; ref = ref->next)
6535 if (ref->type == REF_ARRAY && ref->next == NULL)
6537 ref->u.ar.type = AR_FULL;
6539 for (i = 0; i < ref->u.ar.dimen; i++)
6540 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6542 result->rank = ref->u.ar.dimen;
6550 /* If the last ref of an expression is an array ref, return a copy of the
6551 expression with that one removed. Otherwise, a copy of the original
6552 expression. This is used for allocate-expressions and pointer assignment
6553 LHS, where there may be an array specification that needs to be stripped
6554 off when using gfc_check_vardef_context. */
6557 remove_last_array_ref (gfc_expr* e)
6562 e2 = gfc_copy_expr (e);
6563 for (r = &e2->ref; *r; r = &(*r)->next)
6564 if ((*r)->type == REF_ARRAY && !(*r)->next)
6566 gfc_free_ref_list (*r);
6575 /* Used in resolve_allocate_expr to check that a allocation-object and
6576 a source-expr are conformable. This does not catch all possible
6577 cases; in particular a runtime checking is needed. */
6580 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6583 for (tail = e2->ref; tail && tail->next; tail = tail->next);
6585 /* First compare rank. */
6586 if (tail && e1->rank != tail->u.ar.as->rank)
6588 gfc_error ("Source-expr at %L must be scalar or have the "
6589 "same rank as the allocate-object at %L",
6590 &e1->where, &e2->where);
6601 for (i = 0; i < e1->rank; i++)
6603 if (tail->u.ar.end[i])
6605 mpz_set (s, tail->u.ar.end[i]->value.integer);
6606 mpz_sub (s, s, tail->u.ar.start[i]->value.integer);
6607 mpz_add_ui (s, s, 1);
6611 mpz_set (s, tail->u.ar.start[i]->value.integer);
6614 if (mpz_cmp (e1->shape[i], s) != 0)
6616 gfc_error ("Source-expr at %L and allocate-object at %L must "
6617 "have the same shape", &e1->where, &e2->where);
6630 /* Resolve the expression in an ALLOCATE statement, doing the additional
6631 checks to see whether the expression is OK or not. The expression must
6632 have a trailing array reference that gives the size of the array. */
6635 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6637 int i, pointer, allocatable, dimension, is_abstract;
6639 symbol_attribute attr;
6640 gfc_ref *ref, *ref2;
6643 gfc_symbol *sym = NULL;
6648 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6649 checking of coarrays. */
6650 for (ref = e->ref; ref; ref = ref->next)
6651 if (ref->next == NULL)
6654 if (ref && ref->type == REF_ARRAY)
6655 ref->u.ar.in_allocate = true;
6657 if (gfc_resolve_expr (e) == FAILURE)
6660 /* Make sure the expression is allocatable or a pointer. If it is
6661 pointer, the next-to-last reference must be a pointer. */
6665 sym = e->symtree->n.sym;
6667 /* Check whether ultimate component is abstract and CLASS. */
6670 if (e->expr_type != EXPR_VARIABLE)
6673 attr = gfc_expr_attr (e);
6674 pointer = attr.pointer;
6675 dimension = attr.dimension;
6676 codimension = attr.codimension;
6680 if (sym->ts.type == BT_CLASS)
6682 allocatable = CLASS_DATA (sym)->attr.allocatable;
6683 pointer = CLASS_DATA (sym)->attr.class_pointer;
6684 dimension = CLASS_DATA (sym)->attr.dimension;
6685 codimension = CLASS_DATA (sym)->attr.codimension;
6686 is_abstract = CLASS_DATA (sym)->attr.abstract;
6690 allocatable = sym->attr.allocatable;
6691 pointer = sym->attr.pointer;
6692 dimension = sym->attr.dimension;
6693 codimension = sym->attr.codimension;
6696 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6701 if (ref->next != NULL)
6707 if (gfc_is_coindexed (e))
6709 gfc_error ("Coindexed allocatable object at %L",
6714 c = ref->u.c.component;
6715 if (c->ts.type == BT_CLASS)
6717 allocatable = CLASS_DATA (c)->attr.allocatable;
6718 pointer = CLASS_DATA (c)->attr.class_pointer;
6719 dimension = CLASS_DATA (c)->attr.dimension;
6720 codimension = CLASS_DATA (c)->attr.codimension;
6721 is_abstract = CLASS_DATA (c)->attr.abstract;
6725 allocatable = c->attr.allocatable;
6726 pointer = c->attr.pointer;
6727 dimension = c->attr.dimension;
6728 codimension = c->attr.codimension;
6729 is_abstract = c->attr.abstract;
6741 if (allocatable == 0 && pointer == 0)
6743 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6748 /* Some checks for the SOURCE tag. */
6751 /* Check F03:C631. */
6752 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6754 gfc_error ("Type of entity at %L is type incompatible with "
6755 "source-expr at %L", &e->where, &code->expr3->where);
6759 /* Check F03:C632 and restriction following Note 6.18. */
6760 if (code->expr3->rank > 0
6761 && conformable_arrays (code->expr3, e) == FAILURE)
6764 /* Check F03:C633. */
6765 if (code->expr3->ts.kind != e->ts.kind)
6767 gfc_error ("The allocate-object at %L and the source-expr at %L "
6768 "shall have the same kind type parameter",
6769 &e->where, &code->expr3->where);
6774 /* Check F08:C629. */
6775 if (is_abstract && code->ext.alloc.ts.type == BT_UNKNOWN
6778 gcc_assert (e->ts.type == BT_CLASS);
6779 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6780 "type-spec or source-expr", sym->name, &e->where);
6784 /* In the variable definition context checks, gfc_expr_attr is used
6785 on the expression. This is fooled by the array specification
6786 present in e, thus we have to eliminate that one temporarily. */
6787 e2 = remove_last_array_ref (e);
6789 if (t == SUCCESS && pointer)
6790 t = gfc_check_vardef_context (e2, true, _("ALLOCATE object"));
6792 t = gfc_check_vardef_context (e2, false, _("ALLOCATE object"));
6799 /* Set up default initializer if needed. */
6803 if (code->ext.alloc.ts.type == BT_DERIVED)
6804 ts = code->ext.alloc.ts;
6808 if (ts.type == BT_CLASS)
6809 ts = ts.u.derived->components->ts;
6811 if (ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&ts)))
6813 gfc_code *init_st = gfc_get_code ();
6814 init_st->loc = code->loc;
6815 init_st->op = EXEC_INIT_ASSIGN;
6816 init_st->expr1 = gfc_expr_to_initialize (e);
6817 init_st->expr2 = init_e;
6818 init_st->next = code->next;
6819 code->next = init_st;
6822 else if (code->expr3->mold && code->expr3->ts.type == BT_DERIVED)
6824 /* Default initialization via MOLD (non-polymorphic). */
6825 gfc_expr *rhs = gfc_default_initializer (&code->expr3->ts);
6826 gfc_resolve_expr (rhs);
6827 gfc_free_expr (code->expr3);
6831 if (e->ts.type == BT_CLASS)
6833 /* Make sure the vtab symbol is present when
6834 the module variables are generated. */
6835 gfc_typespec ts = e->ts;
6837 ts = code->expr3->ts;
6838 else if (code->ext.alloc.ts.type == BT_DERIVED)
6839 ts = code->ext.alloc.ts;
6840 gfc_find_derived_vtab (ts.u.derived);
6843 if (pointer || (dimension == 0 && codimension == 0))
6846 /* Make sure the last reference node is an array specifiction. */
6848 if (!ref2 || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6849 || (dimension && ref2->u.ar.dimen == 0))
6851 gfc_error ("Array specification required in ALLOCATE statement "
6852 "at %L", &e->where);
6856 /* Make sure that the array section reference makes sense in the
6857 context of an ALLOCATE specification. */
6862 for (i = ar->dimen; i < ar->dimen + ar->codimen; i++)
6863 if (ar->dimen_type[i] == DIMEN_THIS_IMAGE)
6865 gfc_error ("Coarray specification required in ALLOCATE statement "
6866 "at %L", &e->where);
6870 for (i = 0; i < ar->dimen; i++)
6872 if (ref2->u.ar.type == AR_ELEMENT)
6875 switch (ar->dimen_type[i])
6881 if (ar->start[i] != NULL
6882 && ar->end[i] != NULL
6883 && ar->stride[i] == NULL)
6886 /* Fall Through... */
6891 case DIMEN_THIS_IMAGE:
6892 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6898 for (a = code->ext.alloc.list; a; a = a->next)
6900 sym = a->expr->symtree->n.sym;
6902 /* TODO - check derived type components. */
6903 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6906 if ((ar->start[i] != NULL
6907 && gfc_find_sym_in_expr (sym, ar->start[i]))
6908 || (ar->end[i] != NULL
6909 && gfc_find_sym_in_expr (sym, ar->end[i])))
6911 gfc_error ("'%s' must not appear in the array specification at "
6912 "%L in the same ALLOCATE statement where it is "
6913 "itself allocated", sym->name, &ar->where);
6919 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6921 if (ar->dimen_type[i] == DIMEN_ELEMENT
6922 || ar->dimen_type[i] == DIMEN_RANGE)
6924 if (i == (ar->dimen + ar->codimen - 1))
6926 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6927 "statement at %L", &e->where);
6933 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6934 && ar->stride[i] == NULL)
6937 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6942 if (codimension && ar->as->rank == 0)
6944 gfc_error ("Sorry, allocatable scalar coarrays are not yet supported "
6945 "at %L", &e->where);
6957 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6959 gfc_expr *stat, *errmsg, *pe, *qe;
6960 gfc_alloc *a, *p, *q;
6963 errmsg = code->expr2;
6965 /* Check the stat variable. */
6968 gfc_check_vardef_context (stat, false, _("STAT variable"));
6970 if ((stat->ts.type != BT_INTEGER
6971 && !(stat->ref && (stat->ref->type == REF_ARRAY
6972 || stat->ref->type == REF_COMPONENT)))
6974 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6975 "variable", &stat->where);
6977 for (p = code->ext.alloc.list; p; p = p->next)
6978 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6980 gfc_ref *ref1, *ref2;
6983 for (ref1 = p->expr->ref, ref2 = stat->ref; ref1 && ref2;
6984 ref1 = ref1->next, ref2 = ref2->next)
6986 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
6988 if (ref1->u.c.component->name != ref2->u.c.component->name)
6997 gfc_error ("Stat-variable at %L shall not be %sd within "
6998 "the same %s statement", &stat->where, fcn, fcn);
7004 /* Check the errmsg variable. */
7008 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
7011 gfc_check_vardef_context (errmsg, false, _("ERRMSG variable"));
7013 if ((errmsg->ts.type != BT_CHARACTER
7015 && (errmsg->ref->type == REF_ARRAY
7016 || errmsg->ref->type == REF_COMPONENT)))
7017 || errmsg->rank > 0 )
7018 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
7019 "variable", &errmsg->where);
7021 for (p = code->ext.alloc.list; p; p = p->next)
7022 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
7024 gfc_ref *ref1, *ref2;
7027 for (ref1 = p->expr->ref, ref2 = errmsg->ref; ref1 && ref2;
7028 ref1 = ref1->next, ref2 = ref2->next)
7030 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
7032 if (ref1->u.c.component->name != ref2->u.c.component->name)
7041 gfc_error ("Errmsg-variable at %L shall not be %sd within "
7042 "the same %s statement", &errmsg->where, fcn, fcn);
7048 /* Check that an allocate-object appears only once in the statement.
7049 FIXME: Checking derived types is disabled. */
7050 for (p = code->ext.alloc.list; p; p = p->next)
7053 for (q = p->next; q; q = q->next)
7056 if (pe->symtree->n.sym->name == qe->symtree->n.sym->name)
7058 /* This is a potential collision. */
7059 gfc_ref *pr = pe->ref;
7060 gfc_ref *qr = qe->ref;
7062 /* Follow the references until
7063 a) They start to differ, in which case there is no error;
7064 you can deallocate a%b and a%c in a single statement
7065 b) Both of them stop, which is an error
7066 c) One of them stops, which is also an error. */
7069 if (pr == NULL && qr == NULL)
7071 gfc_error ("Allocate-object at %L also appears at %L",
7072 &pe->where, &qe->where);
7075 else if (pr != NULL && qr == NULL)
7077 gfc_error ("Allocate-object at %L is subobject of"
7078 " object at %L", &pe->where, &qe->where);
7081 else if (pr == NULL && qr != NULL)
7083 gfc_error ("Allocate-object at %L is subobject of"
7084 " object at %L", &qe->where, &pe->where);
7087 /* Here, pr != NULL && qr != NULL */
7088 gcc_assert(pr->type == qr->type);
7089 if (pr->type == REF_ARRAY)
7091 /* Handle cases like allocate(v(3)%x(3), v(2)%x(3)),
7093 gcc_assert (qr->type == REF_ARRAY);
7095 if (pr->next && qr->next)
7097 gfc_array_ref *par = &(pr->u.ar);
7098 gfc_array_ref *qar = &(qr->u.ar);
7099 if (gfc_dep_compare_expr (par->start[0],
7100 qar->start[0]) != 0)
7106 if (pr->u.c.component->name != qr->u.c.component->name)
7117 if (strcmp (fcn, "ALLOCATE") == 0)
7119 for (a = code->ext.alloc.list; a; a = a->next)
7120 resolve_allocate_expr (a->expr, code);
7124 for (a = code->ext.alloc.list; a; a = a->next)
7125 resolve_deallocate_expr (a->expr);
7130 /************ SELECT CASE resolution subroutines ************/
7132 /* Callback function for our mergesort variant. Determines interval
7133 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
7134 op1 > op2. Assumes we're not dealing with the default case.
7135 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
7136 There are nine situations to check. */
7139 compare_cases (const gfc_case *op1, const gfc_case *op2)
7143 if (op1->low == NULL) /* op1 = (:L) */
7145 /* op2 = (:N), so overlap. */
7147 /* op2 = (M:) or (M:N), L < M */
7148 if (op2->low != NULL
7149 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7152 else if (op1->high == NULL) /* op1 = (K:) */
7154 /* op2 = (M:), so overlap. */
7156 /* op2 = (:N) or (M:N), K > N */
7157 if (op2->high != NULL
7158 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7161 else /* op1 = (K:L) */
7163 if (op2->low == NULL) /* op2 = (:N), K > N */
7164 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7166 else if (op2->high == NULL) /* op2 = (M:), L < M */
7167 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7169 else /* op2 = (M:N) */
7173 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7176 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7185 /* Merge-sort a double linked case list, detecting overlap in the
7186 process. LIST is the head of the double linked case list before it
7187 is sorted. Returns the head of the sorted list if we don't see any
7188 overlap, or NULL otherwise. */
7191 check_case_overlap (gfc_case *list)
7193 gfc_case *p, *q, *e, *tail;
7194 int insize, nmerges, psize, qsize, cmp, overlap_seen;
7196 /* If the passed list was empty, return immediately. */
7203 /* Loop unconditionally. The only exit from this loop is a return
7204 statement, when we've finished sorting the case list. */
7211 /* Count the number of merges we do in this pass. */
7214 /* Loop while there exists a merge to be done. */
7219 /* Count this merge. */
7222 /* Cut the list in two pieces by stepping INSIZE places
7223 forward in the list, starting from P. */
7226 for (i = 0; i < insize; i++)
7235 /* Now we have two lists. Merge them! */
7236 while (psize > 0 || (qsize > 0 && q != NULL))
7238 /* See from which the next case to merge comes from. */
7241 /* P is empty so the next case must come from Q. */
7246 else if (qsize == 0 || q == NULL)
7255 cmp = compare_cases (p, q);
7258 /* The whole case range for P is less than the
7266 /* The whole case range for Q is greater than
7267 the case range for P. */
7274 /* The cases overlap, or they are the same
7275 element in the list. Either way, we must
7276 issue an error and get the next case from P. */
7277 /* FIXME: Sort P and Q by line number. */
7278 gfc_error ("CASE label at %L overlaps with CASE "
7279 "label at %L", &p->where, &q->where);
7287 /* Add the next element to the merged list. */
7296 /* P has now stepped INSIZE places along, and so has Q. So
7297 they're the same. */
7302 /* If we have done only one merge or none at all, we've
7303 finished sorting the cases. */
7312 /* Otherwise repeat, merging lists twice the size. */
7318 /* Check to see if an expression is suitable for use in a CASE statement.
7319 Makes sure that all case expressions are scalar constants of the same
7320 type. Return FAILURE if anything is wrong. */
7323 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
7325 if (e == NULL) return SUCCESS;
7327 if (e->ts.type != case_expr->ts.type)
7329 gfc_error ("Expression in CASE statement at %L must be of type %s",
7330 &e->where, gfc_basic_typename (case_expr->ts.type));
7334 /* C805 (R808) For a given case-construct, each case-value shall be of
7335 the same type as case-expr. For character type, length differences
7336 are allowed, but the kind type parameters shall be the same. */
7338 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
7340 gfc_error ("Expression in CASE statement at %L must be of kind %d",
7341 &e->where, case_expr->ts.kind);
7345 /* Convert the case value kind to that of case expression kind,
7348 if (e->ts.kind != case_expr->ts.kind)
7349 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
7353 gfc_error ("Expression in CASE statement at %L must be scalar",
7362 /* Given a completely parsed select statement, we:
7364 - Validate all expressions and code within the SELECT.
7365 - Make sure that the selection expression is not of the wrong type.
7366 - Make sure that no case ranges overlap.
7367 - Eliminate unreachable cases and unreachable code resulting from
7368 removing case labels.
7370 The standard does allow unreachable cases, e.g. CASE (5:3). But
7371 they are a hassle for code generation, and to prevent that, we just
7372 cut them out here. This is not necessary for overlapping cases
7373 because they are illegal and we never even try to generate code.
7375 We have the additional caveat that a SELECT construct could have
7376 been a computed GOTO in the source code. Fortunately we can fairly
7377 easily work around that here: The case_expr for a "real" SELECT CASE
7378 is in code->expr1, but for a computed GOTO it is in code->expr2. All
7379 we have to do is make sure that the case_expr is a scalar integer
7383 resolve_select (gfc_code *code)
7386 gfc_expr *case_expr;
7387 gfc_case *cp, *default_case, *tail, *head;
7388 int seen_unreachable;
7394 if (code->expr1 == NULL)
7396 /* This was actually a computed GOTO statement. */
7397 case_expr = code->expr2;
7398 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
7399 gfc_error ("Selection expression in computed GOTO statement "
7400 "at %L must be a scalar integer expression",
7403 /* Further checking is not necessary because this SELECT was built
7404 by the compiler, so it should always be OK. Just move the
7405 case_expr from expr2 to expr so that we can handle computed
7406 GOTOs as normal SELECTs from here on. */
7407 code->expr1 = code->expr2;
7412 case_expr = code->expr1;
7414 type = case_expr->ts.type;
7415 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
7417 gfc_error ("Argument of SELECT statement at %L cannot be %s",
7418 &case_expr->where, gfc_typename (&case_expr->ts));
7420 /* Punt. Going on here just produce more garbage error messages. */
7424 if (case_expr->rank != 0)
7426 gfc_error ("Argument of SELECT statement at %L must be a scalar "
7427 "expression", &case_expr->where);
7434 /* Raise a warning if an INTEGER case value exceeds the range of
7435 the case-expr. Later, all expressions will be promoted to the
7436 largest kind of all case-labels. */
7438 if (type == BT_INTEGER)
7439 for (body = code->block; body; body = body->block)
7440 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7443 && gfc_check_integer_range (cp->low->value.integer,
7444 case_expr->ts.kind) != ARITH_OK)
7445 gfc_warning ("Expression in CASE statement at %L is "
7446 "not in the range of %s", &cp->low->where,
7447 gfc_typename (&case_expr->ts));
7450 && cp->low != cp->high
7451 && gfc_check_integer_range (cp->high->value.integer,
7452 case_expr->ts.kind) != ARITH_OK)
7453 gfc_warning ("Expression in CASE statement at %L is "
7454 "not in the range of %s", &cp->high->where,
7455 gfc_typename (&case_expr->ts));
7458 /* PR 19168 has a long discussion concerning a mismatch of the kinds
7459 of the SELECT CASE expression and its CASE values. Walk the lists
7460 of case values, and if we find a mismatch, promote case_expr to
7461 the appropriate kind. */
7463 if (type == BT_LOGICAL || type == BT_INTEGER)
7465 for (body = code->block; body; body = body->block)
7467 /* Walk the case label list. */
7468 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7470 /* Intercept the DEFAULT case. It does not have a kind. */
7471 if (cp->low == NULL && cp->high == NULL)
7474 /* Unreachable case ranges are discarded, so ignore. */
7475 if (cp->low != NULL && cp->high != NULL
7476 && cp->low != cp->high
7477 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7481 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
7482 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
7484 if (cp->high != NULL
7485 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
7486 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
7491 /* Assume there is no DEFAULT case. */
7492 default_case = NULL;
7497 for (body = code->block; body; body = body->block)
7499 /* Assume the CASE list is OK, and all CASE labels can be matched. */
7501 seen_unreachable = 0;
7503 /* Walk the case label list, making sure that all case labels
7505 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7507 /* Count the number of cases in the whole construct. */
7510 /* Intercept the DEFAULT case. */
7511 if (cp->low == NULL && cp->high == NULL)
7513 if (default_case != NULL)
7515 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7516 "by a second DEFAULT CASE at %L",
7517 &default_case->where, &cp->where);
7528 /* Deal with single value cases and case ranges. Errors are
7529 issued from the validation function. */
7530 if (validate_case_label_expr (cp->low, case_expr) != SUCCESS
7531 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7537 if (type == BT_LOGICAL
7538 && ((cp->low == NULL || cp->high == NULL)
7539 || cp->low != cp->high))
7541 gfc_error ("Logical range in CASE statement at %L is not "
7542 "allowed", &cp->low->where);
7547 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7550 value = cp->low->value.logical == 0 ? 2 : 1;
7551 if (value & seen_logical)
7553 gfc_error ("Constant logical value in CASE statement "
7554 "is repeated at %L",
7559 seen_logical |= value;
7562 if (cp->low != NULL && cp->high != NULL
7563 && cp->low != cp->high
7564 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7566 if (gfc_option.warn_surprising)
7567 gfc_warning ("Range specification at %L can never "
7568 "be matched", &cp->where);
7570 cp->unreachable = 1;
7571 seen_unreachable = 1;
7575 /* If the case range can be matched, it can also overlap with
7576 other cases. To make sure it does not, we put it in a
7577 double linked list here. We sort that with a merge sort
7578 later on to detect any overlapping cases. */
7582 head->right = head->left = NULL;
7587 tail->right->left = tail;
7594 /* It there was a failure in the previous case label, give up
7595 for this case label list. Continue with the next block. */
7599 /* See if any case labels that are unreachable have been seen.
7600 If so, we eliminate them. This is a bit of a kludge because
7601 the case lists for a single case statement (label) is a
7602 single forward linked lists. */
7603 if (seen_unreachable)
7605 /* Advance until the first case in the list is reachable. */
7606 while (body->ext.block.case_list != NULL
7607 && body->ext.block.case_list->unreachable)
7609 gfc_case *n = body->ext.block.case_list;
7610 body->ext.block.case_list = body->ext.block.case_list->next;
7612 gfc_free_case_list (n);
7615 /* Strip all other unreachable cases. */
7616 if (body->ext.block.case_list)
7618 for (cp = body->ext.block.case_list; cp->next; cp = cp->next)
7620 if (cp->next->unreachable)
7622 gfc_case *n = cp->next;
7623 cp->next = cp->next->next;
7625 gfc_free_case_list (n);
7632 /* See if there were overlapping cases. If the check returns NULL,
7633 there was overlap. In that case we don't do anything. If head
7634 is non-NULL, we prepend the DEFAULT case. The sorted list can
7635 then used during code generation for SELECT CASE constructs with
7636 a case expression of a CHARACTER type. */
7639 head = check_case_overlap (head);
7641 /* Prepend the default_case if it is there. */
7642 if (head != NULL && default_case)
7644 default_case->left = NULL;
7645 default_case->right = head;
7646 head->left = default_case;
7650 /* Eliminate dead blocks that may be the result if we've seen
7651 unreachable case labels for a block. */
7652 for (body = code; body && body->block; body = body->block)
7654 if (body->block->ext.block.case_list == NULL)
7656 /* Cut the unreachable block from the code chain. */
7657 gfc_code *c = body->block;
7658 body->block = c->block;
7660 /* Kill the dead block, but not the blocks below it. */
7662 gfc_free_statements (c);
7666 /* More than two cases is legal but insane for logical selects.
7667 Issue a warning for it. */
7668 if (gfc_option.warn_surprising && type == BT_LOGICAL
7670 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7675 /* Check if a derived type is extensible. */
7678 gfc_type_is_extensible (gfc_symbol *sym)
7680 return !(sym->attr.is_bind_c || sym->attr.sequence);
7684 /* Resolve an associate name: Resolve target and ensure the type-spec is
7685 correct as well as possibly the array-spec. */
7688 resolve_assoc_var (gfc_symbol* sym, bool resolve_target)
7692 gcc_assert (sym->assoc);
7693 gcc_assert (sym->attr.flavor == FL_VARIABLE);
7695 /* If this is for SELECT TYPE, the target may not yet be set. In that
7696 case, return. Resolution will be called later manually again when
7698 target = sym->assoc->target;
7701 gcc_assert (!sym->assoc->dangling);
7703 if (resolve_target && gfc_resolve_expr (target) != SUCCESS)
7706 /* For variable targets, we get some attributes from the target. */
7707 if (target->expr_type == EXPR_VARIABLE)
7711 gcc_assert (target->symtree);
7712 tsym = target->symtree->n.sym;
7714 sym->attr.asynchronous = tsym->attr.asynchronous;
7715 sym->attr.volatile_ = tsym->attr.volatile_;
7717 sym->attr.target = (tsym->attr.target || tsym->attr.pointer);
7720 /* Get type if this was not already set. Note that it can be
7721 some other type than the target in case this is a SELECT TYPE
7722 selector! So we must not update when the type is already there. */
7723 if (sym->ts.type == BT_UNKNOWN)
7724 sym->ts = target->ts;
7725 gcc_assert (sym->ts.type != BT_UNKNOWN);
7727 /* See if this is a valid association-to-variable. */
7728 sym->assoc->variable = (target->expr_type == EXPR_VARIABLE
7729 && !gfc_has_vector_subscript (target));
7731 /* Finally resolve if this is an array or not. */
7732 if (sym->attr.dimension && target->rank == 0)
7734 gfc_error ("Associate-name '%s' at %L is used as array",
7735 sym->name, &sym->declared_at);
7736 sym->attr.dimension = 0;
7739 if (target->rank > 0)
7740 sym->attr.dimension = 1;
7742 if (sym->attr.dimension)
7744 sym->as = gfc_get_array_spec ();
7745 sym->as->rank = target->rank;
7746 sym->as->type = AS_DEFERRED;
7748 /* Target must not be coindexed, thus the associate-variable
7750 sym->as->corank = 0;
7755 /* Resolve a SELECT TYPE statement. */
7758 resolve_select_type (gfc_code *code, gfc_namespace *old_ns)
7760 gfc_symbol *selector_type;
7761 gfc_code *body, *new_st, *if_st, *tail;
7762 gfc_code *class_is = NULL, *default_case = NULL;
7765 char name[GFC_MAX_SYMBOL_LEN];
7769 ns = code->ext.block.ns;
7772 /* Check for F03:C813. */
7773 if (code->expr1->ts.type != BT_CLASS
7774 && !(code->expr2 && code->expr2->ts.type == BT_CLASS))
7776 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
7777 "at %L", &code->loc);
7783 if (code->expr1->symtree->n.sym->attr.untyped)
7784 code->expr1->symtree->n.sym->ts = code->expr2->ts;
7785 selector_type = CLASS_DATA (code->expr2)->ts.u.derived;
7788 selector_type = CLASS_DATA (code->expr1)->ts.u.derived;
7790 /* Loop over TYPE IS / CLASS IS cases. */
7791 for (body = code->block; body; body = body->block)
7793 c = body->ext.block.case_list;
7795 /* Check F03:C815. */
7796 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7797 && !gfc_type_is_extensible (c->ts.u.derived))
7799 gfc_error ("Derived type '%s' at %L must be extensible",
7800 c->ts.u.derived->name, &c->where);
7805 /* Check F03:C816. */
7806 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7807 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7809 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7810 c->ts.u.derived->name, &c->where, selector_type->name);
7815 /* Intercept the DEFAULT case. */
7816 if (c->ts.type == BT_UNKNOWN)
7818 /* Check F03:C818. */
7821 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7822 "by a second DEFAULT CASE at %L",
7823 &default_case->ext.block.case_list->where, &c->where);
7828 default_case = body;
7835 /* Transform SELECT TYPE statement to BLOCK and associate selector to
7836 target if present. If there are any EXIT statements referring to the
7837 SELECT TYPE construct, this is no problem because the gfc_code
7838 reference stays the same and EXIT is equally possible from the BLOCK
7839 it is changed to. */
7840 code->op = EXEC_BLOCK;
7843 gfc_association_list* assoc;
7845 assoc = gfc_get_association_list ();
7846 assoc->st = code->expr1->symtree;
7847 assoc->target = gfc_copy_expr (code->expr2);
7848 /* assoc->variable will be set by resolve_assoc_var. */
7850 code->ext.block.assoc = assoc;
7851 code->expr1->symtree->n.sym->assoc = assoc;
7853 resolve_assoc_var (code->expr1->symtree->n.sym, false);
7856 code->ext.block.assoc = NULL;
7858 /* Add EXEC_SELECT to switch on type. */
7859 new_st = gfc_get_code ();
7860 new_st->op = code->op;
7861 new_st->expr1 = code->expr1;
7862 new_st->expr2 = code->expr2;
7863 new_st->block = code->block;
7864 code->expr1 = code->expr2 = NULL;
7869 ns->code->next = new_st;
7871 code->op = EXEC_SELECT;
7872 gfc_add_vptr_component (code->expr1);
7873 gfc_add_hash_component (code->expr1);
7875 /* Loop over TYPE IS / CLASS IS cases. */
7876 for (body = code->block; body; body = body->block)
7878 c = body->ext.block.case_list;
7880 if (c->ts.type == BT_DERIVED)
7881 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7882 c->ts.u.derived->hash_value);
7884 else if (c->ts.type == BT_UNKNOWN)
7887 /* Associate temporary to selector. This should only be done
7888 when this case is actually true, so build a new ASSOCIATE
7889 that does precisely this here (instead of using the
7892 if (c->ts.type == BT_CLASS)
7893 sprintf (name, "__tmp_class_%s", c->ts.u.derived->name);
7895 sprintf (name, "__tmp_type_%s", c->ts.u.derived->name);
7896 st = gfc_find_symtree (ns->sym_root, name);
7897 gcc_assert (st->n.sym->assoc);
7898 st->n.sym->assoc->target = gfc_get_variable_expr (code->expr1->symtree);
7899 if (c->ts.type == BT_DERIVED)
7900 gfc_add_data_component (st->n.sym->assoc->target);
7902 new_st = gfc_get_code ();
7903 new_st->op = EXEC_BLOCK;
7904 new_st->ext.block.ns = gfc_build_block_ns (ns);
7905 new_st->ext.block.ns->code = body->next;
7906 body->next = new_st;
7908 /* Chain in the new list only if it is marked as dangling. Otherwise
7909 there is a CASE label overlap and this is already used. Just ignore,
7910 the error is diagonsed elsewhere. */
7911 if (st->n.sym->assoc->dangling)
7913 new_st->ext.block.assoc = st->n.sym->assoc;
7914 st->n.sym->assoc->dangling = 0;
7917 resolve_assoc_var (st->n.sym, false);
7920 /* Take out CLASS IS cases for separate treatment. */
7922 while (body && body->block)
7924 if (body->block->ext.block.case_list->ts.type == BT_CLASS)
7926 /* Add to class_is list. */
7927 if (class_is == NULL)
7929 class_is = body->block;
7934 for (tail = class_is; tail->block; tail = tail->block) ;
7935 tail->block = body->block;
7938 /* Remove from EXEC_SELECT list. */
7939 body->block = body->block->block;
7952 /* Add a default case to hold the CLASS IS cases. */
7953 for (tail = code; tail->block; tail = tail->block) ;
7954 tail->block = gfc_get_code ();
7956 tail->op = EXEC_SELECT_TYPE;
7957 tail->ext.block.case_list = gfc_get_case ();
7958 tail->ext.block.case_list->ts.type = BT_UNKNOWN;
7960 default_case = tail;
7963 /* More than one CLASS IS block? */
7964 if (class_is->block)
7968 /* Sort CLASS IS blocks by extension level. */
7972 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7975 /* F03:C817 (check for doubles). */
7976 if ((*c1)->ext.block.case_list->ts.u.derived->hash_value
7977 == c2->ext.block.case_list->ts.u.derived->hash_value)
7979 gfc_error ("Double CLASS IS block in SELECT TYPE "
7981 &c2->ext.block.case_list->where);
7984 if ((*c1)->ext.block.case_list->ts.u.derived->attr.extension
7985 < c2->ext.block.case_list->ts.u.derived->attr.extension)
7988 (*c1)->block = c2->block;
7998 /* Generate IF chain. */
7999 if_st = gfc_get_code ();
8000 if_st->op = EXEC_IF;
8002 for (body = class_is; body; body = body->block)
8004 new_st->block = gfc_get_code ();
8005 new_st = new_st->block;
8006 new_st->op = EXEC_IF;
8007 /* Set up IF condition: Call _gfortran_is_extension_of. */
8008 new_st->expr1 = gfc_get_expr ();
8009 new_st->expr1->expr_type = EXPR_FUNCTION;
8010 new_st->expr1->ts.type = BT_LOGICAL;
8011 new_st->expr1->ts.kind = 4;
8012 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
8013 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
8014 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
8015 /* Set up arguments. */
8016 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
8017 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
8018 new_st->expr1->value.function.actual->expr->where = code->loc;
8019 gfc_add_vptr_component (new_st->expr1->value.function.actual->expr);
8020 vtab = gfc_find_derived_vtab (body->ext.block.case_list->ts.u.derived);
8021 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
8022 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
8023 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
8024 new_st->next = body->next;
8026 if (default_case->next)
8028 new_st->block = gfc_get_code ();
8029 new_st = new_st->block;
8030 new_st->op = EXEC_IF;
8031 new_st->next = default_case->next;
8034 /* Replace CLASS DEFAULT code by the IF chain. */
8035 default_case->next = if_st;
8038 /* Resolve the internal code. This can not be done earlier because
8039 it requires that the sym->assoc of selectors is set already. */
8040 gfc_current_ns = ns;
8041 gfc_resolve_blocks (code->block, gfc_current_ns);
8042 gfc_current_ns = old_ns;
8044 resolve_select (code);
8048 /* Resolve a transfer statement. This is making sure that:
8049 -- a derived type being transferred has only non-pointer components
8050 -- a derived type being transferred doesn't have private components, unless
8051 it's being transferred from the module where the type was defined
8052 -- we're not trying to transfer a whole assumed size array. */
8055 resolve_transfer (gfc_code *code)
8064 while (exp != NULL && exp->expr_type == EXPR_OP
8065 && exp->value.op.op == INTRINSIC_PARENTHESES)
8066 exp = exp->value.op.op1;
8068 if (exp == NULL || (exp->expr_type != EXPR_VARIABLE
8069 && exp->expr_type != EXPR_FUNCTION))
8072 /* If we are reading, the variable will be changed. Note that
8073 code->ext.dt may be NULL if the TRANSFER is related to
8074 an INQUIRE statement -- but in this case, we are not reading, either. */
8075 if (code->ext.dt && code->ext.dt->dt_io_kind->value.iokind == M_READ
8076 && gfc_check_vardef_context (exp, false, _("item in READ")) == FAILURE)
8079 sym = exp->symtree->n.sym;
8082 /* Go to actual component transferred. */
8083 for (ref = exp->ref; ref; ref = ref->next)
8084 if (ref->type == REF_COMPONENT)
8085 ts = &ref->u.c.component->ts;
8087 if (ts->type == BT_CLASS)
8089 /* FIXME: Test for defined input/output. */
8090 gfc_error ("Data transfer element at %L cannot be polymorphic unless "
8091 "it is processed by a defined input/output procedure",
8096 if (ts->type == BT_DERIVED)
8098 /* Check that transferred derived type doesn't contain POINTER
8100 if (ts->u.derived->attr.pointer_comp)
8102 gfc_error ("Data transfer element at %L cannot have "
8103 "POINTER components", &code->loc);
8108 if (ts->u.derived->attr.proc_pointer_comp)
8110 gfc_error ("Data transfer element at %L cannot have "
8111 "procedure pointer components", &code->loc);
8115 if (ts->u.derived->attr.alloc_comp)
8117 gfc_error ("Data transfer element at %L cannot have "
8118 "ALLOCATABLE components", &code->loc);
8122 if (derived_inaccessible (ts->u.derived))
8124 gfc_error ("Data transfer element at %L cannot have "
8125 "PRIVATE components",&code->loc);
8130 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
8131 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
8133 gfc_error ("Data transfer element at %L cannot be a full reference to "
8134 "an assumed-size array", &code->loc);
8140 /*********** Toplevel code resolution subroutines ***********/
8142 /* Find the set of labels that are reachable from this block. We also
8143 record the last statement in each block. */
8146 find_reachable_labels (gfc_code *block)
8153 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
8155 /* Collect labels in this block. We don't keep those corresponding
8156 to END {IF|SELECT}, these are checked in resolve_branch by going
8157 up through the code_stack. */
8158 for (c = block; c; c = c->next)
8160 if (c->here && c->op != EXEC_END_BLOCK)
8161 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
8164 /* Merge with labels from parent block. */
8167 gcc_assert (cs_base->prev->reachable_labels);
8168 bitmap_ior_into (cs_base->reachable_labels,
8169 cs_base->prev->reachable_labels);
8175 resolve_sync (gfc_code *code)
8177 /* Check imageset. The * case matches expr1 == NULL. */
8180 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
8181 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
8182 "INTEGER expression", &code->expr1->where);
8183 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
8184 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
8185 gfc_error ("Imageset argument at %L must between 1 and num_images()",
8186 &code->expr1->where);
8187 else if (code->expr1->expr_type == EXPR_ARRAY
8188 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
8190 gfc_constructor *cons;
8191 cons = gfc_constructor_first (code->expr1->value.constructor);
8192 for (; cons; cons = gfc_constructor_next (cons))
8193 if (cons->expr->expr_type == EXPR_CONSTANT
8194 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
8195 gfc_error ("Imageset argument at %L must between 1 and "
8196 "num_images()", &cons->expr->where);
8202 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
8203 || code->expr2->expr_type != EXPR_VARIABLE))
8204 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
8205 &code->expr2->where);
8209 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
8210 || code->expr3->expr_type != EXPR_VARIABLE))
8211 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
8212 &code->expr3->where);
8216 /* Given a branch to a label, see if the branch is conforming.
8217 The code node describes where the branch is located. */
8220 resolve_branch (gfc_st_label *label, gfc_code *code)
8227 /* Step one: is this a valid branching target? */
8229 if (label->defined == ST_LABEL_UNKNOWN)
8231 gfc_error ("Label %d referenced at %L is never defined", label->value,
8236 if (label->defined != ST_LABEL_TARGET)
8238 gfc_error ("Statement at %L is not a valid branch target statement "
8239 "for the branch statement at %L", &label->where, &code->loc);
8243 /* Step two: make sure this branch is not a branch to itself ;-) */
8245 if (code->here == label)
8247 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
8251 /* Step three: See if the label is in the same block as the
8252 branching statement. The hard work has been done by setting up
8253 the bitmap reachable_labels. */
8255 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
8257 /* Check now whether there is a CRITICAL construct; if so, check
8258 whether the label is still visible outside of the CRITICAL block,
8259 which is invalid. */
8260 for (stack = cs_base; stack; stack = stack->prev)
8261 if (stack->current->op == EXEC_CRITICAL
8262 && bitmap_bit_p (stack->reachable_labels, label->value))
8263 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
8264 " at %L", &code->loc, &label->where);
8269 /* Step four: If we haven't found the label in the bitmap, it may
8270 still be the label of the END of the enclosing block, in which
8271 case we find it by going up the code_stack. */
8273 for (stack = cs_base; stack; stack = stack->prev)
8275 if (stack->current->next && stack->current->next->here == label)
8277 if (stack->current->op == EXEC_CRITICAL)
8279 /* Note: A label at END CRITICAL does not leave the CRITICAL
8280 construct as END CRITICAL is still part of it. */
8281 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
8282 " at %L", &code->loc, &label->where);
8289 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
8293 /* The label is not in an enclosing block, so illegal. This was
8294 allowed in Fortran 66, so we allow it as extension. No
8295 further checks are necessary in this case. */
8296 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
8297 "as the GOTO statement at %L", &label->where,
8303 /* Check whether EXPR1 has the same shape as EXPR2. */
8306 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
8308 mpz_t shape[GFC_MAX_DIMENSIONS];
8309 mpz_t shape2[GFC_MAX_DIMENSIONS];
8310 gfc_try result = FAILURE;
8313 /* Compare the rank. */
8314 if (expr1->rank != expr2->rank)
8317 /* Compare the size of each dimension. */
8318 for (i=0; i<expr1->rank; i++)
8320 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
8323 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
8326 if (mpz_cmp (shape[i], shape2[i]))
8330 /* When either of the two expression is an assumed size array, we
8331 ignore the comparison of dimension sizes. */
8336 for (i--; i >= 0; i--)
8338 mpz_clear (shape[i]);
8339 mpz_clear (shape2[i]);
8345 /* Check whether a WHERE assignment target or a WHERE mask expression
8346 has the same shape as the outmost WHERE mask expression. */
8349 resolve_where (gfc_code *code, gfc_expr *mask)
8355 cblock = code->block;
8357 /* Store the first WHERE mask-expr of the WHERE statement or construct.
8358 In case of nested WHERE, only the outmost one is stored. */
8359 if (mask == NULL) /* outmost WHERE */
8361 else /* inner WHERE */
8368 /* Check if the mask-expr has a consistent shape with the
8369 outmost WHERE mask-expr. */
8370 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
8371 gfc_error ("WHERE mask at %L has inconsistent shape",
8372 &cblock->expr1->where);
8375 /* the assignment statement of a WHERE statement, or the first
8376 statement in where-body-construct of a WHERE construct */
8377 cnext = cblock->next;
8382 /* WHERE assignment statement */
8385 /* Check shape consistent for WHERE assignment target. */
8386 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
8387 gfc_error ("WHERE assignment target at %L has "
8388 "inconsistent shape", &cnext->expr1->where);
8392 case EXEC_ASSIGN_CALL:
8393 resolve_call (cnext);
8394 if (!cnext->resolved_sym->attr.elemental)
8395 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8396 &cnext->ext.actual->expr->where);
8399 /* WHERE or WHERE construct is part of a where-body-construct */
8401 resolve_where (cnext, e);
8405 gfc_error ("Unsupported statement inside WHERE at %L",
8408 /* the next statement within the same where-body-construct */
8409 cnext = cnext->next;
8411 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8412 cblock = cblock->block;
8417 /* Resolve assignment in FORALL construct.
8418 NVAR is the number of FORALL index variables, and VAR_EXPR records the
8419 FORALL index variables. */
8422 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
8426 for (n = 0; n < nvar; n++)
8428 gfc_symbol *forall_index;
8430 forall_index = var_expr[n]->symtree->n.sym;
8432 /* Check whether the assignment target is one of the FORALL index
8434 if ((code->expr1->expr_type == EXPR_VARIABLE)
8435 && (code->expr1->symtree->n.sym == forall_index))
8436 gfc_error ("Assignment to a FORALL index variable at %L",
8437 &code->expr1->where);
8440 /* If one of the FORALL index variables doesn't appear in the
8441 assignment variable, then there could be a many-to-one
8442 assignment. Emit a warning rather than an error because the
8443 mask could be resolving this problem. */
8444 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
8445 gfc_warning ("The FORALL with index '%s' is not used on the "
8446 "left side of the assignment at %L and so might "
8447 "cause multiple assignment to this object",
8448 var_expr[n]->symtree->name, &code->expr1->where);
8454 /* Resolve WHERE statement in FORALL construct. */
8457 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
8458 gfc_expr **var_expr)
8463 cblock = code->block;
8466 /* the assignment statement of a WHERE statement, or the first
8467 statement in where-body-construct of a WHERE construct */
8468 cnext = cblock->next;
8473 /* WHERE assignment statement */
8475 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
8478 /* WHERE operator assignment statement */
8479 case EXEC_ASSIGN_CALL:
8480 resolve_call (cnext);
8481 if (!cnext->resolved_sym->attr.elemental)
8482 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8483 &cnext->ext.actual->expr->where);
8486 /* WHERE or WHERE construct is part of a where-body-construct */
8488 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
8492 gfc_error ("Unsupported statement inside WHERE at %L",
8495 /* the next statement within the same where-body-construct */
8496 cnext = cnext->next;
8498 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8499 cblock = cblock->block;
8504 /* Traverse the FORALL body to check whether the following errors exist:
8505 1. For assignment, check if a many-to-one assignment happens.
8506 2. For WHERE statement, check the WHERE body to see if there is any
8507 many-to-one assignment. */
8510 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
8514 c = code->block->next;
8520 case EXEC_POINTER_ASSIGN:
8521 gfc_resolve_assign_in_forall (c, nvar, var_expr);
8524 case EXEC_ASSIGN_CALL:
8528 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
8529 there is no need to handle it here. */
8533 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
8538 /* The next statement in the FORALL body. */
8544 /* Counts the number of iterators needed inside a forall construct, including
8545 nested forall constructs. This is used to allocate the needed memory
8546 in gfc_resolve_forall. */
8549 gfc_count_forall_iterators (gfc_code *code)
8551 int max_iters, sub_iters, current_iters;
8552 gfc_forall_iterator *fa;
8554 gcc_assert(code->op == EXEC_FORALL);
8558 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8561 code = code->block->next;
8565 if (code->op == EXEC_FORALL)
8567 sub_iters = gfc_count_forall_iterators (code);
8568 if (sub_iters > max_iters)
8569 max_iters = sub_iters;
8574 return current_iters + max_iters;
8578 /* Given a FORALL construct, first resolve the FORALL iterator, then call
8579 gfc_resolve_forall_body to resolve the FORALL body. */
8582 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
8584 static gfc_expr **var_expr;
8585 static int total_var = 0;
8586 static int nvar = 0;
8588 gfc_forall_iterator *fa;
8593 /* Start to resolve a FORALL construct */
8594 if (forall_save == 0)
8596 /* Count the total number of FORALL index in the nested FORALL
8597 construct in order to allocate the VAR_EXPR with proper size. */
8598 total_var = gfc_count_forall_iterators (code);
8600 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
8601 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
8604 /* The information about FORALL iterator, including FORALL index start, end
8605 and stride. The FORALL index can not appear in start, end or stride. */
8606 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8608 /* Check if any outer FORALL index name is the same as the current
8610 for (i = 0; i < nvar; i++)
8612 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
8614 gfc_error ("An outer FORALL construct already has an index "
8615 "with this name %L", &fa->var->where);
8619 /* Record the current FORALL index. */
8620 var_expr[nvar] = gfc_copy_expr (fa->var);
8624 /* No memory leak. */
8625 gcc_assert (nvar <= total_var);
8628 /* Resolve the FORALL body. */
8629 gfc_resolve_forall_body (code, nvar, var_expr);
8631 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
8632 gfc_resolve_blocks (code->block, ns);
8636 /* Free only the VAR_EXPRs allocated in this frame. */
8637 for (i = nvar; i < tmp; i++)
8638 gfc_free_expr (var_expr[i]);
8642 /* We are in the outermost FORALL construct. */
8643 gcc_assert (forall_save == 0);
8645 /* VAR_EXPR is not needed any more. */
8646 gfc_free (var_expr);
8652 /* Resolve a BLOCK construct statement. */
8655 resolve_block_construct (gfc_code* code)
8657 /* Resolve the BLOCK's namespace. */
8658 gfc_resolve (code->ext.block.ns);
8660 /* For an ASSOCIATE block, the associations (and their targets) are already
8661 resolved during resolve_symbol. */
8665 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8668 static void resolve_code (gfc_code *, gfc_namespace *);
8671 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8675 for (; b; b = b->block)
8677 t = gfc_resolve_expr (b->expr1);
8678 if (gfc_resolve_expr (b->expr2) == FAILURE)
8684 if (t == SUCCESS && b->expr1 != NULL
8685 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8686 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8693 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8694 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8699 resolve_branch (b->label1, b);
8703 resolve_block_construct (b);
8707 case EXEC_SELECT_TYPE:
8718 case EXEC_OMP_ATOMIC:
8719 case EXEC_OMP_CRITICAL:
8721 case EXEC_OMP_MASTER:
8722 case EXEC_OMP_ORDERED:
8723 case EXEC_OMP_PARALLEL:
8724 case EXEC_OMP_PARALLEL_DO:
8725 case EXEC_OMP_PARALLEL_SECTIONS:
8726 case EXEC_OMP_PARALLEL_WORKSHARE:
8727 case EXEC_OMP_SECTIONS:
8728 case EXEC_OMP_SINGLE:
8730 case EXEC_OMP_TASKWAIT:
8731 case EXEC_OMP_WORKSHARE:
8735 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8738 resolve_code (b->next, ns);
8743 /* Does everything to resolve an ordinary assignment. Returns true
8744 if this is an interface assignment. */
8746 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8756 if (gfc_extend_assign (code, ns) == SUCCESS)
8760 if (code->op == EXEC_ASSIGN_CALL)
8762 lhs = code->ext.actual->expr;
8763 rhsptr = &code->ext.actual->next->expr;
8767 gfc_actual_arglist* args;
8768 gfc_typebound_proc* tbp;
8770 gcc_assert (code->op == EXEC_COMPCALL);
8772 args = code->expr1->value.compcall.actual;
8774 rhsptr = &args->next->expr;
8776 tbp = code->expr1->value.compcall.tbp;
8777 gcc_assert (!tbp->is_generic);
8780 /* Make a temporary rhs when there is a default initializer
8781 and rhs is the same symbol as the lhs. */
8782 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8783 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8784 && gfc_has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8785 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8786 *rhsptr = gfc_get_parentheses (*rhsptr);
8795 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8796 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8797 &code->loc) == FAILURE)
8800 /* Handle the case of a BOZ literal on the RHS. */
8801 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8804 if (gfc_option.warn_surprising)
8805 gfc_warning ("BOZ literal at %L is bitwise transferred "
8806 "non-integer symbol '%s'", &code->loc,
8807 lhs->symtree->n.sym->name);
8809 if (!gfc_convert_boz (rhs, &lhs->ts))
8811 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8813 if (rc == ARITH_UNDERFLOW)
8814 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8815 ". This check can be disabled with the option "
8816 "-fno-range-check", &rhs->where);
8817 else if (rc == ARITH_OVERFLOW)
8818 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8819 ". This check can be disabled with the option "
8820 "-fno-range-check", &rhs->where);
8821 else if (rc == ARITH_NAN)
8822 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8823 ". This check can be disabled with the option "
8824 "-fno-range-check", &rhs->where);
8829 if (lhs->ts.type == BT_CHARACTER
8830 && gfc_option.warn_character_truncation)
8832 if (lhs->ts.u.cl != NULL
8833 && lhs->ts.u.cl->length != NULL
8834 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8835 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8837 if (rhs->expr_type == EXPR_CONSTANT)
8838 rlen = rhs->value.character.length;
8840 else if (rhs->ts.u.cl != NULL
8841 && rhs->ts.u.cl->length != NULL
8842 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8843 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8845 if (rlen && llen && rlen > llen)
8846 gfc_warning_now ("CHARACTER expression will be truncated "
8847 "in assignment (%d/%d) at %L",
8848 llen, rlen, &code->loc);
8851 /* Ensure that a vector index expression for the lvalue is evaluated
8852 to a temporary if the lvalue symbol is referenced in it. */
8855 for (ref = lhs->ref; ref; ref= ref->next)
8856 if (ref->type == REF_ARRAY)
8858 for (n = 0; n < ref->u.ar.dimen; n++)
8859 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8860 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8861 ref->u.ar.start[n]))
8863 = gfc_get_parentheses (ref->u.ar.start[n]);
8867 if (gfc_pure (NULL))
8869 if (lhs->ts.type == BT_DERIVED
8870 && lhs->expr_type == EXPR_VARIABLE
8871 && lhs->ts.u.derived->attr.pointer_comp
8872 && rhs->expr_type == EXPR_VARIABLE
8873 && (gfc_impure_variable (rhs->symtree->n.sym)
8874 || gfc_is_coindexed (rhs)))
8877 if (gfc_is_coindexed (rhs))
8878 gfc_error ("Coindexed expression at %L is assigned to "
8879 "a derived type variable with a POINTER "
8880 "component in a PURE procedure",
8883 gfc_error ("The impure variable at %L is assigned to "
8884 "a derived type variable with a POINTER "
8885 "component in a PURE procedure (12.6)",
8890 /* Fortran 2008, C1283. */
8891 if (gfc_is_coindexed (lhs))
8893 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8894 "procedure", &rhs->where);
8899 if (gfc_implicit_pure (NULL))
8901 if (lhs->expr_type == EXPR_VARIABLE
8902 && lhs->symtree->n.sym != gfc_current_ns->proc_name
8903 && lhs->symtree->n.sym->ns != gfc_current_ns)
8904 gfc_current_ns->proc_name->attr.implicit_pure = 0;
8906 if (lhs->ts.type == BT_DERIVED
8907 && lhs->expr_type == EXPR_VARIABLE
8908 && lhs->ts.u.derived->attr.pointer_comp
8909 && rhs->expr_type == EXPR_VARIABLE
8910 && (gfc_impure_variable (rhs->symtree->n.sym)
8911 || gfc_is_coindexed (rhs)))
8912 gfc_current_ns->proc_name->attr.implicit_pure = 0;
8914 /* Fortran 2008, C1283. */
8915 if (gfc_is_coindexed (lhs))
8916 gfc_current_ns->proc_name->attr.implicit_pure = 0;
8920 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
8921 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
8922 if (lhs->ts.type == BT_CLASS)
8924 gfc_error ("Variable must not be polymorphic in assignment at %L",
8929 /* F2008, Section 7.2.1.2. */
8930 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
8932 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
8933 "component in assignment at %L", &lhs->where);
8937 gfc_check_assign (lhs, rhs, 1);
8942 /* Given a block of code, recursively resolve everything pointed to by this
8946 resolve_code (gfc_code *code, gfc_namespace *ns)
8948 int omp_workshare_save;
8953 frame.prev = cs_base;
8957 find_reachable_labels (code);
8959 for (; code; code = code->next)
8961 frame.current = code;
8962 forall_save = forall_flag;
8964 if (code->op == EXEC_FORALL)
8967 gfc_resolve_forall (code, ns, forall_save);
8970 else if (code->block)
8972 omp_workshare_save = -1;
8975 case EXEC_OMP_PARALLEL_WORKSHARE:
8976 omp_workshare_save = omp_workshare_flag;
8977 omp_workshare_flag = 1;
8978 gfc_resolve_omp_parallel_blocks (code, ns);
8980 case EXEC_OMP_PARALLEL:
8981 case EXEC_OMP_PARALLEL_DO:
8982 case EXEC_OMP_PARALLEL_SECTIONS:
8984 omp_workshare_save = omp_workshare_flag;
8985 omp_workshare_flag = 0;
8986 gfc_resolve_omp_parallel_blocks (code, ns);
8989 gfc_resolve_omp_do_blocks (code, ns);
8991 case EXEC_SELECT_TYPE:
8992 /* Blocks are handled in resolve_select_type because we have
8993 to transform the SELECT TYPE into ASSOCIATE first. */
8995 case EXEC_OMP_WORKSHARE:
8996 omp_workshare_save = omp_workshare_flag;
8997 omp_workshare_flag = 1;
9000 gfc_resolve_blocks (code->block, ns);
9004 if (omp_workshare_save != -1)
9005 omp_workshare_flag = omp_workshare_save;
9009 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
9010 t = gfc_resolve_expr (code->expr1);
9011 forall_flag = forall_save;
9013 if (gfc_resolve_expr (code->expr2) == FAILURE)
9016 if (code->op == EXEC_ALLOCATE
9017 && gfc_resolve_expr (code->expr3) == FAILURE)
9023 case EXEC_END_BLOCK:
9027 case EXEC_ERROR_STOP:
9031 case EXEC_ASSIGN_CALL:
9036 case EXEC_SYNC_IMAGES:
9037 case EXEC_SYNC_MEMORY:
9038 resolve_sync (code);
9042 /* Keep track of which entry we are up to. */
9043 current_entry_id = code->ext.entry->id;
9047 resolve_where (code, NULL);
9051 if (code->expr1 != NULL)
9053 if (code->expr1->ts.type != BT_INTEGER)
9054 gfc_error ("ASSIGNED GOTO statement at %L requires an "
9055 "INTEGER variable", &code->expr1->where);
9056 else if (code->expr1->symtree->n.sym->attr.assign != 1)
9057 gfc_error ("Variable '%s' has not been assigned a target "
9058 "label at %L", code->expr1->symtree->n.sym->name,
9059 &code->expr1->where);
9062 resolve_branch (code->label1, code);
9066 if (code->expr1 != NULL
9067 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
9068 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
9069 "INTEGER return specifier", &code->expr1->where);
9072 case EXEC_INIT_ASSIGN:
9073 case EXEC_END_PROCEDURE:
9080 if (gfc_check_vardef_context (code->expr1, false, _("assignment"))
9084 if (resolve_ordinary_assign (code, ns))
9086 if (code->op == EXEC_COMPCALL)
9093 case EXEC_LABEL_ASSIGN:
9094 if (code->label1->defined == ST_LABEL_UNKNOWN)
9095 gfc_error ("Label %d referenced at %L is never defined",
9096 code->label1->value, &code->label1->where);
9098 && (code->expr1->expr_type != EXPR_VARIABLE
9099 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
9100 || code->expr1->symtree->n.sym->ts.kind
9101 != gfc_default_integer_kind
9102 || code->expr1->symtree->n.sym->as != NULL))
9103 gfc_error ("ASSIGN statement at %L requires a scalar "
9104 "default INTEGER variable", &code->expr1->where);
9107 case EXEC_POINTER_ASSIGN:
9114 /* This is both a variable definition and pointer assignment
9115 context, so check both of them. For rank remapping, a final
9116 array ref may be present on the LHS and fool gfc_expr_attr
9117 used in gfc_check_vardef_context. Remove it. */
9118 e = remove_last_array_ref (code->expr1);
9119 t = gfc_check_vardef_context (e, true, _("pointer assignment"));
9121 t = gfc_check_vardef_context (e, false, _("pointer assignment"));
9126 gfc_check_pointer_assign (code->expr1, code->expr2);
9130 case EXEC_ARITHMETIC_IF:
9132 && code->expr1->ts.type != BT_INTEGER
9133 && code->expr1->ts.type != BT_REAL)
9134 gfc_error ("Arithmetic IF statement at %L requires a numeric "
9135 "expression", &code->expr1->where);
9137 resolve_branch (code->label1, code);
9138 resolve_branch (code->label2, code);
9139 resolve_branch (code->label3, code);
9143 if (t == SUCCESS && code->expr1 != NULL
9144 && (code->expr1->ts.type != BT_LOGICAL
9145 || code->expr1->rank != 0))
9146 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
9147 &code->expr1->where);
9152 resolve_call (code);
9157 resolve_typebound_subroutine (code);
9161 resolve_ppc_call (code);
9165 /* Select is complicated. Also, a SELECT construct could be
9166 a transformed computed GOTO. */
9167 resolve_select (code);
9170 case EXEC_SELECT_TYPE:
9171 resolve_select_type (code, ns);
9175 resolve_block_construct (code);
9179 if (code->ext.iterator != NULL)
9181 gfc_iterator *iter = code->ext.iterator;
9182 if (gfc_resolve_iterator (iter, true) != FAILURE)
9183 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
9188 if (code->expr1 == NULL)
9189 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
9191 && (code->expr1->rank != 0
9192 || code->expr1->ts.type != BT_LOGICAL))
9193 gfc_error ("Exit condition of DO WHILE loop at %L must be "
9194 "a scalar LOGICAL expression", &code->expr1->where);
9199 resolve_allocate_deallocate (code, "ALLOCATE");
9203 case EXEC_DEALLOCATE:
9205 resolve_allocate_deallocate (code, "DEALLOCATE");
9210 if (gfc_resolve_open (code->ext.open) == FAILURE)
9213 resolve_branch (code->ext.open->err, code);
9217 if (gfc_resolve_close (code->ext.close) == FAILURE)
9220 resolve_branch (code->ext.close->err, code);
9223 case EXEC_BACKSPACE:
9227 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
9230 resolve_branch (code->ext.filepos->err, code);
9234 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9237 resolve_branch (code->ext.inquire->err, code);
9241 gcc_assert (code->ext.inquire != NULL);
9242 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9245 resolve_branch (code->ext.inquire->err, code);
9249 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
9252 resolve_branch (code->ext.wait->err, code);
9253 resolve_branch (code->ext.wait->end, code);
9254 resolve_branch (code->ext.wait->eor, code);
9259 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
9262 resolve_branch (code->ext.dt->err, code);
9263 resolve_branch (code->ext.dt->end, code);
9264 resolve_branch (code->ext.dt->eor, code);
9268 resolve_transfer (code);
9272 resolve_forall_iterators (code->ext.forall_iterator);
9274 if (code->expr1 != NULL
9275 && (code->expr1->ts.type != BT_LOGICAL || code->expr1->rank))
9276 gfc_error ("FORALL mask clause at %L requires a scalar LOGICAL "
9277 "expression", &code->expr1->where);
9280 case EXEC_OMP_ATOMIC:
9281 case EXEC_OMP_BARRIER:
9282 case EXEC_OMP_CRITICAL:
9283 case EXEC_OMP_FLUSH:
9285 case EXEC_OMP_MASTER:
9286 case EXEC_OMP_ORDERED:
9287 case EXEC_OMP_SECTIONS:
9288 case EXEC_OMP_SINGLE:
9289 case EXEC_OMP_TASKWAIT:
9290 case EXEC_OMP_WORKSHARE:
9291 gfc_resolve_omp_directive (code, ns);
9294 case EXEC_OMP_PARALLEL:
9295 case EXEC_OMP_PARALLEL_DO:
9296 case EXEC_OMP_PARALLEL_SECTIONS:
9297 case EXEC_OMP_PARALLEL_WORKSHARE:
9299 omp_workshare_save = omp_workshare_flag;
9300 omp_workshare_flag = 0;
9301 gfc_resolve_omp_directive (code, ns);
9302 omp_workshare_flag = omp_workshare_save;
9306 gfc_internal_error ("resolve_code(): Bad statement code");
9310 cs_base = frame.prev;
9314 /* Resolve initial values and make sure they are compatible with
9318 resolve_values (gfc_symbol *sym)
9322 if (sym->value == NULL)
9325 if (sym->value->expr_type == EXPR_STRUCTURE)
9326 t= resolve_structure_cons (sym->value, 1);
9328 t = gfc_resolve_expr (sym->value);
9333 gfc_check_assign_symbol (sym, sym->value);
9337 /* Verify the binding labels for common blocks that are BIND(C). The label
9338 for a BIND(C) common block must be identical in all scoping units in which
9339 the common block is declared. Further, the binding label can not collide
9340 with any other global entity in the program. */
9343 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
9345 if (comm_block_tree->n.common->is_bind_c == 1)
9347 gfc_gsymbol *binding_label_gsym;
9348 gfc_gsymbol *comm_name_gsym;
9350 /* See if a global symbol exists by the common block's name. It may
9351 be NULL if the common block is use-associated. */
9352 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
9353 comm_block_tree->n.common->name);
9354 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
9355 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
9356 "with the global entity '%s' at %L",
9357 comm_block_tree->n.common->binding_label,
9358 comm_block_tree->n.common->name,
9359 &(comm_block_tree->n.common->where),
9360 comm_name_gsym->name, &(comm_name_gsym->where));
9361 else if (comm_name_gsym != NULL
9362 && strcmp (comm_name_gsym->name,
9363 comm_block_tree->n.common->name) == 0)
9365 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
9367 if (comm_name_gsym->binding_label == NULL)
9368 /* No binding label for common block stored yet; save this one. */
9369 comm_name_gsym->binding_label =
9370 comm_block_tree->n.common->binding_label;
9372 if (strcmp (comm_name_gsym->binding_label,
9373 comm_block_tree->n.common->binding_label) != 0)
9375 /* Common block names match but binding labels do not. */
9376 gfc_error ("Binding label '%s' for common block '%s' at %L "
9377 "does not match the binding label '%s' for common "
9379 comm_block_tree->n.common->binding_label,
9380 comm_block_tree->n.common->name,
9381 &(comm_block_tree->n.common->where),
9382 comm_name_gsym->binding_label,
9383 comm_name_gsym->name,
9384 &(comm_name_gsym->where));
9389 /* There is no binding label (NAME="") so we have nothing further to
9390 check and nothing to add as a global symbol for the label. */
9391 if (comm_block_tree->n.common->binding_label[0] == '\0' )
9394 binding_label_gsym =
9395 gfc_find_gsymbol (gfc_gsym_root,
9396 comm_block_tree->n.common->binding_label);
9397 if (binding_label_gsym == NULL)
9399 /* Need to make a global symbol for the binding label to prevent
9400 it from colliding with another. */
9401 binding_label_gsym =
9402 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
9403 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
9404 binding_label_gsym->type = GSYM_COMMON;
9408 /* If comm_name_gsym is NULL, the name common block is use
9409 associated and the name could be colliding. */
9410 if (binding_label_gsym->type != GSYM_COMMON)
9411 gfc_error ("Binding label '%s' for common block '%s' at %L "
9412 "collides with the global entity '%s' at %L",
9413 comm_block_tree->n.common->binding_label,
9414 comm_block_tree->n.common->name,
9415 &(comm_block_tree->n.common->where),
9416 binding_label_gsym->name,
9417 &(binding_label_gsym->where));
9418 else if (comm_name_gsym != NULL
9419 && (strcmp (binding_label_gsym->name,
9420 comm_name_gsym->binding_label) != 0)
9421 && (strcmp (binding_label_gsym->sym_name,
9422 comm_name_gsym->name) != 0))
9423 gfc_error ("Binding label '%s' for common block '%s' at %L "
9424 "collides with global entity '%s' at %L",
9425 binding_label_gsym->name, binding_label_gsym->sym_name,
9426 &(comm_block_tree->n.common->where),
9427 comm_name_gsym->name, &(comm_name_gsym->where));
9435 /* Verify any BIND(C) derived types in the namespace so we can report errors
9436 for them once, rather than for each variable declared of that type. */
9439 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
9441 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
9442 && derived_sym->attr.is_bind_c == 1)
9443 verify_bind_c_derived_type (derived_sym);
9449 /* Verify that any binding labels used in a given namespace do not collide
9450 with the names or binding labels of any global symbols. */
9453 gfc_verify_binding_labels (gfc_symbol *sym)
9457 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
9458 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
9460 gfc_gsymbol *bind_c_sym;
9462 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
9463 if (bind_c_sym != NULL
9464 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
9466 if (sym->attr.if_source == IFSRC_DECL
9467 && (bind_c_sym->type != GSYM_SUBROUTINE
9468 && bind_c_sym->type != GSYM_FUNCTION)
9469 && ((sym->attr.contained == 1
9470 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
9471 || (sym->attr.use_assoc == 1
9472 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
9474 /* Make sure global procedures don't collide with anything. */
9475 gfc_error ("Binding label '%s' at %L collides with the global "
9476 "entity '%s' at %L", sym->binding_label,
9477 &(sym->declared_at), bind_c_sym->name,
9478 &(bind_c_sym->where));
9481 else if (sym->attr.contained == 0
9482 && (sym->attr.if_source == IFSRC_IFBODY
9483 && sym->attr.flavor == FL_PROCEDURE)
9484 && (bind_c_sym->sym_name != NULL
9485 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
9487 /* Make sure procedures in interface bodies don't collide. */
9488 gfc_error ("Binding label '%s' in interface body at %L collides "
9489 "with the global entity '%s' at %L",
9491 &(sym->declared_at), bind_c_sym->name,
9492 &(bind_c_sym->where));
9495 else if (sym->attr.contained == 0
9496 && sym->attr.if_source == IFSRC_UNKNOWN)
9497 if ((sym->attr.use_assoc && bind_c_sym->mod_name
9498 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
9499 || sym->attr.use_assoc == 0)
9501 gfc_error ("Binding label '%s' at %L collides with global "
9502 "entity '%s' at %L", sym->binding_label,
9503 &(sym->declared_at), bind_c_sym->name,
9504 &(bind_c_sym->where));
9509 /* Clear the binding label to prevent checking multiple times. */
9510 sym->binding_label[0] = '\0';
9512 else if (bind_c_sym == NULL)
9514 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
9515 bind_c_sym->where = sym->declared_at;
9516 bind_c_sym->sym_name = sym->name;
9518 if (sym->attr.use_assoc == 1)
9519 bind_c_sym->mod_name = sym->module;
9521 if (sym->ns->proc_name != NULL)
9522 bind_c_sym->mod_name = sym->ns->proc_name->name;
9524 if (sym->attr.contained == 0)
9526 if (sym->attr.subroutine)
9527 bind_c_sym->type = GSYM_SUBROUTINE;
9528 else if (sym->attr.function)
9529 bind_c_sym->type = GSYM_FUNCTION;
9537 /* Resolve an index expression. */
9540 resolve_index_expr (gfc_expr *e)
9542 if (gfc_resolve_expr (e) == FAILURE)
9545 if (gfc_simplify_expr (e, 0) == FAILURE)
9548 if (gfc_specification_expr (e) == FAILURE)
9555 /* Resolve a charlen structure. */
9558 resolve_charlen (gfc_charlen *cl)
9567 specification_expr = 1;
9569 if (resolve_index_expr (cl->length) == FAILURE)
9571 specification_expr = 0;
9575 /* "If the character length parameter value evaluates to a negative
9576 value, the length of character entities declared is zero." */
9577 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
9579 if (gfc_option.warn_surprising)
9580 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
9581 " the length has been set to zero",
9582 &cl->length->where, i);
9583 gfc_replace_expr (cl->length,
9584 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
9587 /* Check that the character length is not too large. */
9588 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
9589 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
9590 && cl->length->ts.type == BT_INTEGER
9591 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
9593 gfc_error ("String length at %L is too large", &cl->length->where);
9601 /* Test for non-constant shape arrays. */
9604 is_non_constant_shape_array (gfc_symbol *sym)
9610 not_constant = false;
9611 if (sym->as != NULL)
9613 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
9614 has not been simplified; parameter array references. Do the
9615 simplification now. */
9616 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
9618 e = sym->as->lower[i];
9619 if (e && (resolve_index_expr (e) == FAILURE
9620 || !gfc_is_constant_expr (e)))
9621 not_constant = true;
9622 e = sym->as->upper[i];
9623 if (e && (resolve_index_expr (e) == FAILURE
9624 || !gfc_is_constant_expr (e)))
9625 not_constant = true;
9628 return not_constant;
9631 /* Given a symbol and an initialization expression, add code to initialize
9632 the symbol to the function entry. */
9634 build_init_assign (gfc_symbol *sym, gfc_expr *init)
9638 gfc_namespace *ns = sym->ns;
9640 /* Search for the function namespace if this is a contained
9641 function without an explicit result. */
9642 if (sym->attr.function && sym == sym->result
9643 && sym->name != sym->ns->proc_name->name)
9646 for (;ns; ns = ns->sibling)
9647 if (strcmp (ns->proc_name->name, sym->name) == 0)
9653 gfc_free_expr (init);
9657 /* Build an l-value expression for the result. */
9658 lval = gfc_lval_expr_from_sym (sym);
9660 /* Add the code at scope entry. */
9661 init_st = gfc_get_code ();
9662 init_st->next = ns->code;
9665 /* Assign the default initializer to the l-value. */
9666 init_st->loc = sym->declared_at;
9667 init_st->op = EXEC_INIT_ASSIGN;
9668 init_st->expr1 = lval;
9669 init_st->expr2 = init;
9672 /* Assign the default initializer to a derived type variable or result. */
9675 apply_default_init (gfc_symbol *sym)
9677 gfc_expr *init = NULL;
9679 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9682 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
9683 init = gfc_default_initializer (&sym->ts);
9685 if (init == NULL && sym->ts.type != BT_CLASS)
9688 build_init_assign (sym, init);
9689 sym->attr.referenced = 1;
9692 /* Build an initializer for a local integer, real, complex, logical, or
9693 character variable, based on the command line flags finit-local-zero,
9694 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
9695 null if the symbol should not have a default initialization. */
9697 build_default_init_expr (gfc_symbol *sym)
9700 gfc_expr *init_expr;
9703 /* These symbols should never have a default initialization. */
9704 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
9705 || sym->attr.external
9707 || sym->attr.pointer
9708 || sym->attr.in_equivalence
9709 || sym->attr.in_common
9712 || sym->attr.cray_pointee
9713 || sym->attr.cray_pointer)
9716 /* Now we'll try to build an initializer expression. */
9717 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9720 /* We will only initialize integers, reals, complex, logicals, and
9721 characters, and only if the corresponding command-line flags
9722 were set. Otherwise, we free init_expr and return null. */
9723 switch (sym->ts.type)
9726 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9727 mpz_set_si (init_expr->value.integer,
9728 gfc_option.flag_init_integer_value);
9731 gfc_free_expr (init_expr);
9737 switch (gfc_option.flag_init_real)
9739 case GFC_INIT_REAL_SNAN:
9740 init_expr->is_snan = 1;
9742 case GFC_INIT_REAL_NAN:
9743 mpfr_set_nan (init_expr->value.real);
9746 case GFC_INIT_REAL_INF:
9747 mpfr_set_inf (init_expr->value.real, 1);
9750 case GFC_INIT_REAL_NEG_INF:
9751 mpfr_set_inf (init_expr->value.real, -1);
9754 case GFC_INIT_REAL_ZERO:
9755 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9759 gfc_free_expr (init_expr);
9766 switch (gfc_option.flag_init_real)
9768 case GFC_INIT_REAL_SNAN:
9769 init_expr->is_snan = 1;
9771 case GFC_INIT_REAL_NAN:
9772 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9773 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9776 case GFC_INIT_REAL_INF:
9777 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
9778 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
9781 case GFC_INIT_REAL_NEG_INF:
9782 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9783 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9786 case GFC_INIT_REAL_ZERO:
9787 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9791 gfc_free_expr (init_expr);
9798 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9799 init_expr->value.logical = 0;
9800 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9801 init_expr->value.logical = 1;
9804 gfc_free_expr (init_expr);
9810 /* For characters, the length must be constant in order to
9811 create a default initializer. */
9812 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9813 && sym->ts.u.cl->length
9814 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9816 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9817 init_expr->value.character.length = char_len;
9818 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9819 for (i = 0; i < char_len; i++)
9820 init_expr->value.character.string[i]
9821 = (unsigned char) gfc_option.flag_init_character_value;
9825 gfc_free_expr (init_expr);
9831 gfc_free_expr (init_expr);
9837 /* Add an initialization expression to a local variable. */
9839 apply_default_init_local (gfc_symbol *sym)
9841 gfc_expr *init = NULL;
9843 /* The symbol should be a variable or a function return value. */
9844 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9845 || (sym->attr.function && sym->result != sym))
9848 /* Try to build the initializer expression. If we can't initialize
9849 this symbol, then init will be NULL. */
9850 init = build_default_init_expr (sym);
9854 /* For saved variables, we don't want to add an initializer at
9855 function entry, so we just add a static initializer. */
9856 if (sym->attr.save || sym->ns->save_all
9857 || gfc_option.flag_max_stack_var_size == 0)
9859 /* Don't clobber an existing initializer! */
9860 gcc_assert (sym->value == NULL);
9865 build_init_assign (sym, init);
9869 /* Resolution of common features of flavors variable and procedure. */
9872 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9874 /* Constraints on deferred shape variable. */
9875 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9877 if (sym->attr.allocatable)
9879 if (sym->attr.dimension)
9881 gfc_error ("Allocatable array '%s' at %L must have "
9882 "a deferred shape", sym->name, &sym->declared_at);
9885 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9886 "may not be ALLOCATABLE", sym->name,
9887 &sym->declared_at) == FAILURE)
9891 if (sym->attr.pointer && sym->attr.dimension)
9893 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
9894 sym->name, &sym->declared_at);
9900 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
9901 && !sym->attr.dummy && sym->ts.type != BT_CLASS && !sym->assoc)
9903 gfc_error ("Array '%s' at %L cannot have a deferred shape",
9904 sym->name, &sym->declared_at);
9909 /* Constraints on polymorphic variables. */
9910 if (sym->ts.type == BT_CLASS && !(sym->result && sym->result != sym))
9913 if (sym->attr.class_ok
9914 && !gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
9916 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
9917 CLASS_DATA (sym)->ts.u.derived->name, sym->name,
9923 /* Assume that use associated symbols were checked in the module ns.
9924 Class-variables that are associate-names are also something special
9925 and excepted from the test. */
9926 if (!sym->attr.class_ok && !sym->attr.use_assoc && !sym->assoc)
9928 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
9929 "or pointer", sym->name, &sym->declared_at);
9938 /* Additional checks for symbols with flavor variable and derived
9939 type. To be called from resolve_fl_variable. */
9942 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
9944 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
9946 /* Check to see if a derived type is blocked from being host
9947 associated by the presence of another class I symbol in the same
9948 namespace. 14.6.1.3 of the standard and the discussion on
9949 comp.lang.fortran. */
9950 if (sym->ns != sym->ts.u.derived->ns
9951 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
9954 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
9955 if (s && s->attr.flavor != FL_DERIVED)
9957 gfc_error ("The type '%s' cannot be host associated at %L "
9958 "because it is blocked by an incompatible object "
9959 "of the same name declared at %L",
9960 sym->ts.u.derived->name, &sym->declared_at,
9966 /* 4th constraint in section 11.3: "If an object of a type for which
9967 component-initialization is specified (R429) appears in the
9968 specification-part of a module and does not have the ALLOCATABLE
9969 or POINTER attribute, the object shall have the SAVE attribute."
9971 The check for initializers is performed with
9972 gfc_has_default_initializer because gfc_default_initializer generates
9973 a hidden default for allocatable components. */
9974 if (!(sym->value || no_init_flag) && sym->ns->proc_name
9975 && sym->ns->proc_name->attr.flavor == FL_MODULE
9976 && !sym->ns->save_all && !sym->attr.save
9977 && !sym->attr.pointer && !sym->attr.allocatable
9978 && gfc_has_default_initializer (sym->ts.u.derived)
9979 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
9980 "module variable '%s' at %L, needed due to "
9981 "the default initialization", sym->name,
9982 &sym->declared_at) == FAILURE)
9985 /* Assign default initializer. */
9986 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
9987 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
9989 sym->value = gfc_default_initializer (&sym->ts);
9996 /* Resolve symbols with flavor variable. */
9999 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
10001 int no_init_flag, automatic_flag;
10003 const char *auto_save_msg;
10005 auto_save_msg = "Automatic object '%s' at %L cannot have the "
10008 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10011 /* Set this flag to check that variables are parameters of all entries.
10012 This check is effected by the call to gfc_resolve_expr through
10013 is_non_constant_shape_array. */
10014 specification_expr = 1;
10016 if (sym->ns->proc_name
10017 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10018 || sym->ns->proc_name->attr.is_main_program)
10019 && !sym->attr.use_assoc
10020 && !sym->attr.allocatable
10021 && !sym->attr.pointer
10022 && is_non_constant_shape_array (sym))
10024 /* The shape of a main program or module array needs to be
10026 gfc_error ("The module or main program array '%s' at %L must "
10027 "have constant shape", sym->name, &sym->declared_at);
10028 specification_expr = 0;
10032 /* Constraints on deferred type parameter. */
10033 if (sym->ts.deferred && !(sym->attr.pointer || sym->attr.allocatable))
10035 gfc_error ("Entity '%s' at %L has a deferred type parameter and "
10036 "requires either the pointer or allocatable attribute",
10037 sym->name, &sym->declared_at);
10041 if (sym->ts.type == BT_CHARACTER)
10043 /* Make sure that character string variables with assumed length are
10044 dummy arguments. */
10045 e = sym->ts.u.cl->length;
10046 if (e == NULL && !sym->attr.dummy && !sym->attr.result
10047 && !sym->ts.deferred)
10049 gfc_error ("Entity with assumed character length at %L must be a "
10050 "dummy argument or a PARAMETER", &sym->declared_at);
10054 if (e && sym->attr.save == SAVE_EXPLICIT && !gfc_is_constant_expr (e))
10056 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10060 if (!gfc_is_constant_expr (e)
10061 && !(e->expr_type == EXPR_VARIABLE
10062 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
10063 && sym->ns->proc_name
10064 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10065 || sym->ns->proc_name->attr.is_main_program)
10066 && !sym->attr.use_assoc)
10068 gfc_error ("'%s' at %L must have constant character length "
10069 "in this context", sym->name, &sym->declared_at);
10074 if (sym->value == NULL && sym->attr.referenced)
10075 apply_default_init_local (sym); /* Try to apply a default initialization. */
10077 /* Determine if the symbol may not have an initializer. */
10078 no_init_flag = automatic_flag = 0;
10079 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
10080 || sym->attr.intrinsic || sym->attr.result)
10082 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
10083 && is_non_constant_shape_array (sym))
10085 no_init_flag = automatic_flag = 1;
10087 /* Also, they must not have the SAVE attribute.
10088 SAVE_IMPLICIT is checked below. */
10089 if (sym->attr.save == SAVE_EXPLICIT)
10091 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10096 /* Ensure that any initializer is simplified. */
10098 gfc_simplify_expr (sym->value, 1);
10100 /* Reject illegal initializers. */
10101 if (!sym->mark && sym->value)
10103 if (sym->attr.allocatable || (sym->ts.type == BT_CLASS
10104 && CLASS_DATA (sym)->attr.allocatable))
10105 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
10106 sym->name, &sym->declared_at);
10107 else if (sym->attr.external)
10108 gfc_error ("External '%s' at %L cannot have an initializer",
10109 sym->name, &sym->declared_at);
10110 else if (sym->attr.dummy
10111 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
10112 gfc_error ("Dummy '%s' at %L cannot have an initializer",
10113 sym->name, &sym->declared_at);
10114 else if (sym->attr.intrinsic)
10115 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
10116 sym->name, &sym->declared_at);
10117 else if (sym->attr.result)
10118 gfc_error ("Function result '%s' at %L cannot have an initializer",
10119 sym->name, &sym->declared_at);
10120 else if (automatic_flag)
10121 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
10122 sym->name, &sym->declared_at);
10124 goto no_init_error;
10129 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
10130 return resolve_fl_variable_derived (sym, no_init_flag);
10136 /* Resolve a procedure. */
10139 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
10141 gfc_formal_arglist *arg;
10143 if (sym->attr.function
10144 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10147 if (sym->ts.type == BT_CHARACTER)
10149 gfc_charlen *cl = sym->ts.u.cl;
10151 if (cl && cl->length && gfc_is_constant_expr (cl->length)
10152 && resolve_charlen (cl) == FAILURE)
10155 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10156 && sym->attr.proc == PROC_ST_FUNCTION)
10158 gfc_error ("Character-valued statement function '%s' at %L must "
10159 "have constant length", sym->name, &sym->declared_at);
10164 /* Ensure that derived type for are not of a private type. Internal
10165 module procedures are excluded by 2.2.3.3 - i.e., they are not
10166 externally accessible and can access all the objects accessible in
10168 if (!(sym->ns->parent
10169 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
10170 && gfc_check_symbol_access (sym))
10172 gfc_interface *iface;
10174 for (arg = sym->formal; arg; arg = arg->next)
10177 && arg->sym->ts.type == BT_DERIVED
10178 && !arg->sym->ts.u.derived->attr.use_assoc
10179 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10180 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
10181 "PRIVATE type and cannot be a dummy argument"
10182 " of '%s', which is PUBLIC at %L",
10183 arg->sym->name, sym->name, &sym->declared_at)
10186 /* Stop this message from recurring. */
10187 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10192 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10193 PRIVATE to the containing module. */
10194 for (iface = sym->generic; iface; iface = iface->next)
10196 for (arg = iface->sym->formal; arg; arg = arg->next)
10199 && arg->sym->ts.type == BT_DERIVED
10200 && !arg->sym->ts.u.derived->attr.use_assoc
10201 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10202 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10203 "'%s' in PUBLIC interface '%s' at %L "
10204 "takes dummy arguments of '%s' which is "
10205 "PRIVATE", iface->sym->name, sym->name,
10206 &iface->sym->declared_at,
10207 gfc_typename (&arg->sym->ts)) == FAILURE)
10209 /* Stop this message from recurring. */
10210 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10216 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10217 PRIVATE to the containing module. */
10218 for (iface = sym->generic; iface; iface = iface->next)
10220 for (arg = iface->sym->formal; arg; arg = arg->next)
10223 && arg->sym->ts.type == BT_DERIVED
10224 && !arg->sym->ts.u.derived->attr.use_assoc
10225 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10226 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10227 "'%s' in PUBLIC interface '%s' at %L "
10228 "takes dummy arguments of '%s' which is "
10229 "PRIVATE", iface->sym->name, sym->name,
10230 &iface->sym->declared_at,
10231 gfc_typename (&arg->sym->ts)) == FAILURE)
10233 /* Stop this message from recurring. */
10234 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10241 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
10242 && !sym->attr.proc_pointer)
10244 gfc_error ("Function '%s' at %L cannot have an initializer",
10245 sym->name, &sym->declared_at);
10249 /* An external symbol may not have an initializer because it is taken to be
10250 a procedure. Exception: Procedure Pointers. */
10251 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
10253 gfc_error ("External object '%s' at %L may not have an initializer",
10254 sym->name, &sym->declared_at);
10258 /* An elemental function is required to return a scalar 12.7.1 */
10259 if (sym->attr.elemental && sym->attr.function && sym->as)
10261 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
10262 "result", sym->name, &sym->declared_at);
10263 /* Reset so that the error only occurs once. */
10264 sym->attr.elemental = 0;
10268 if (sym->attr.proc == PROC_ST_FUNCTION
10269 && (sym->attr.allocatable || sym->attr.pointer))
10271 gfc_error ("Statement function '%s' at %L may not have pointer or "
10272 "allocatable attribute", sym->name, &sym->declared_at);
10276 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
10277 char-len-param shall not be array-valued, pointer-valued, recursive
10278 or pure. ....snip... A character value of * may only be used in the
10279 following ways: (i) Dummy arg of procedure - dummy associates with
10280 actual length; (ii) To declare a named constant; or (iii) External
10281 function - but length must be declared in calling scoping unit. */
10282 if (sym->attr.function
10283 && sym->ts.type == BT_CHARACTER
10284 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
10286 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
10287 || (sym->attr.recursive) || (sym->attr.pure))
10289 if (sym->as && sym->as->rank)
10290 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10291 "array-valued", sym->name, &sym->declared_at);
10293 if (sym->attr.pointer)
10294 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10295 "pointer-valued", sym->name, &sym->declared_at);
10297 if (sym->attr.pure)
10298 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10299 "pure", sym->name, &sym->declared_at);
10301 if (sym->attr.recursive)
10302 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10303 "recursive", sym->name, &sym->declared_at);
10308 /* Appendix B.2 of the standard. Contained functions give an
10309 error anyway. Fixed-form is likely to be F77/legacy. Deferred
10310 character length is an F2003 feature. */
10311 if (!sym->attr.contained
10312 && gfc_current_form != FORM_FIXED
10313 && !sym->ts.deferred)
10314 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
10315 "CHARACTER(*) function '%s' at %L",
10316 sym->name, &sym->declared_at);
10319 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
10321 gfc_formal_arglist *curr_arg;
10322 int has_non_interop_arg = 0;
10324 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
10325 sym->common_block) == FAILURE)
10327 /* Clear these to prevent looking at them again if there was an
10329 sym->attr.is_bind_c = 0;
10330 sym->attr.is_c_interop = 0;
10331 sym->ts.is_c_interop = 0;
10335 /* So far, no errors have been found. */
10336 sym->attr.is_c_interop = 1;
10337 sym->ts.is_c_interop = 1;
10340 curr_arg = sym->formal;
10341 while (curr_arg != NULL)
10343 /* Skip implicitly typed dummy args here. */
10344 if (curr_arg->sym->attr.implicit_type == 0)
10345 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
10346 /* If something is found to fail, record the fact so we
10347 can mark the symbol for the procedure as not being
10348 BIND(C) to try and prevent multiple errors being
10350 has_non_interop_arg = 1;
10352 curr_arg = curr_arg->next;
10355 /* See if any of the arguments were not interoperable and if so, clear
10356 the procedure symbol to prevent duplicate error messages. */
10357 if (has_non_interop_arg != 0)
10359 sym->attr.is_c_interop = 0;
10360 sym->ts.is_c_interop = 0;
10361 sym->attr.is_bind_c = 0;
10365 if (!sym->attr.proc_pointer)
10367 if (sym->attr.save == SAVE_EXPLICIT)
10369 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
10370 "in '%s' at %L", sym->name, &sym->declared_at);
10373 if (sym->attr.intent)
10375 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
10376 "in '%s' at %L", sym->name, &sym->declared_at);
10379 if (sym->attr.subroutine && sym->attr.result)
10381 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
10382 "in '%s' at %L", sym->name, &sym->declared_at);
10385 if (sym->attr.external && sym->attr.function
10386 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
10387 || sym->attr.contained))
10389 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
10390 "in '%s' at %L", sym->name, &sym->declared_at);
10393 if (strcmp ("ppr@", sym->name) == 0)
10395 gfc_error ("Procedure pointer result '%s' at %L "
10396 "is missing the pointer attribute",
10397 sym->ns->proc_name->name, &sym->declared_at);
10406 /* Resolve a list of finalizer procedures. That is, after they have hopefully
10407 been defined and we now know their defined arguments, check that they fulfill
10408 the requirements of the standard for procedures used as finalizers. */
10411 gfc_resolve_finalizers (gfc_symbol* derived)
10413 gfc_finalizer* list;
10414 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
10415 gfc_try result = SUCCESS;
10416 bool seen_scalar = false;
10418 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
10421 /* Walk over the list of finalizer-procedures, check them, and if any one
10422 does not fit in with the standard's definition, print an error and remove
10423 it from the list. */
10424 prev_link = &derived->f2k_derived->finalizers;
10425 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
10431 /* Skip this finalizer if we already resolved it. */
10432 if (list->proc_tree)
10434 prev_link = &(list->next);
10438 /* Check this exists and is a SUBROUTINE. */
10439 if (!list->proc_sym->attr.subroutine)
10441 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
10442 list->proc_sym->name, &list->where);
10446 /* We should have exactly one argument. */
10447 if (!list->proc_sym->formal || list->proc_sym->formal->next)
10449 gfc_error ("FINAL procedure at %L must have exactly one argument",
10453 arg = list->proc_sym->formal->sym;
10455 /* This argument must be of our type. */
10456 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
10458 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
10459 &arg->declared_at, derived->name);
10463 /* It must neither be a pointer nor allocatable nor optional. */
10464 if (arg->attr.pointer)
10466 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
10467 &arg->declared_at);
10470 if (arg->attr.allocatable)
10472 gfc_error ("Argument of FINAL procedure at %L must not be"
10473 " ALLOCATABLE", &arg->declared_at);
10476 if (arg->attr.optional)
10478 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
10479 &arg->declared_at);
10483 /* It must not be INTENT(OUT). */
10484 if (arg->attr.intent == INTENT_OUT)
10486 gfc_error ("Argument of FINAL procedure at %L must not be"
10487 " INTENT(OUT)", &arg->declared_at);
10491 /* Warn if the procedure is non-scalar and not assumed shape. */
10492 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
10493 && arg->as->type != AS_ASSUMED_SHAPE)
10494 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
10495 " shape argument", &arg->declared_at);
10497 /* Check that it does not match in kind and rank with a FINAL procedure
10498 defined earlier. To really loop over the *earlier* declarations,
10499 we need to walk the tail of the list as new ones were pushed at the
10501 /* TODO: Handle kind parameters once they are implemented. */
10502 my_rank = (arg->as ? arg->as->rank : 0);
10503 for (i = list->next; i; i = i->next)
10505 /* Argument list might be empty; that is an error signalled earlier,
10506 but we nevertheless continued resolving. */
10507 if (i->proc_sym->formal)
10509 gfc_symbol* i_arg = i->proc_sym->formal->sym;
10510 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
10511 if (i_rank == my_rank)
10513 gfc_error ("FINAL procedure '%s' declared at %L has the same"
10514 " rank (%d) as '%s'",
10515 list->proc_sym->name, &list->where, my_rank,
10516 i->proc_sym->name);
10522 /* Is this the/a scalar finalizer procedure? */
10523 if (!arg->as || arg->as->rank == 0)
10524 seen_scalar = true;
10526 /* Find the symtree for this procedure. */
10527 gcc_assert (!list->proc_tree);
10528 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
10530 prev_link = &list->next;
10533 /* Remove wrong nodes immediately from the list so we don't risk any
10534 troubles in the future when they might fail later expectations. */
10538 *prev_link = list->next;
10539 gfc_free_finalizer (i);
10542 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
10543 were nodes in the list, must have been for arrays. It is surely a good
10544 idea to have a scalar version there if there's something to finalize. */
10545 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
10546 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
10547 " defined at %L, suggest also scalar one",
10548 derived->name, &derived->declared_at);
10550 /* TODO: Remove this error when finalization is finished. */
10551 gfc_error ("Finalization at %L is not yet implemented",
10552 &derived->declared_at);
10558 /* Check that it is ok for the typebound procedure proc to override the
10562 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
10565 const gfc_symbol* proc_target;
10566 const gfc_symbol* old_target;
10567 unsigned proc_pass_arg, old_pass_arg, argpos;
10568 gfc_formal_arglist* proc_formal;
10569 gfc_formal_arglist* old_formal;
10571 /* This procedure should only be called for non-GENERIC proc. */
10572 gcc_assert (!proc->n.tb->is_generic);
10574 /* If the overwritten procedure is GENERIC, this is an error. */
10575 if (old->n.tb->is_generic)
10577 gfc_error ("Can't overwrite GENERIC '%s' at %L",
10578 old->name, &proc->n.tb->where);
10582 where = proc->n.tb->where;
10583 proc_target = proc->n.tb->u.specific->n.sym;
10584 old_target = old->n.tb->u.specific->n.sym;
10586 /* Check that overridden binding is not NON_OVERRIDABLE. */
10587 if (old->n.tb->non_overridable)
10589 gfc_error ("'%s' at %L overrides a procedure binding declared"
10590 " NON_OVERRIDABLE", proc->name, &where);
10594 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
10595 if (!old->n.tb->deferred && proc->n.tb->deferred)
10597 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
10598 " non-DEFERRED binding", proc->name, &where);
10602 /* If the overridden binding is PURE, the overriding must be, too. */
10603 if (old_target->attr.pure && !proc_target->attr.pure)
10605 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
10606 proc->name, &where);
10610 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
10611 is not, the overriding must not be either. */
10612 if (old_target->attr.elemental && !proc_target->attr.elemental)
10614 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
10615 " ELEMENTAL", proc->name, &where);
10618 if (!old_target->attr.elemental && proc_target->attr.elemental)
10620 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
10621 " be ELEMENTAL, either", proc->name, &where);
10625 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
10627 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
10629 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
10630 " SUBROUTINE", proc->name, &where);
10634 /* If the overridden binding is a FUNCTION, the overriding must also be a
10635 FUNCTION and have the same characteristics. */
10636 if (old_target->attr.function)
10638 if (!proc_target->attr.function)
10640 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
10641 " FUNCTION", proc->name, &where);
10645 /* FIXME: Do more comprehensive checking (including, for instance, the
10646 rank and array-shape). */
10647 gcc_assert (proc_target->result && old_target->result);
10648 if (!gfc_compare_types (&proc_target->result->ts,
10649 &old_target->result->ts))
10651 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
10652 " matching result types", proc->name, &where);
10657 /* If the overridden binding is PUBLIC, the overriding one must not be
10659 if (old->n.tb->access == ACCESS_PUBLIC
10660 && proc->n.tb->access == ACCESS_PRIVATE)
10662 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
10663 " PRIVATE", proc->name, &where);
10667 /* Compare the formal argument lists of both procedures. This is also abused
10668 to find the position of the passed-object dummy arguments of both
10669 bindings as at least the overridden one might not yet be resolved and we
10670 need those positions in the check below. */
10671 proc_pass_arg = old_pass_arg = 0;
10672 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
10674 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
10677 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
10678 proc_formal && old_formal;
10679 proc_formal = proc_formal->next, old_formal = old_formal->next)
10681 if (proc->n.tb->pass_arg
10682 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
10683 proc_pass_arg = argpos;
10684 if (old->n.tb->pass_arg
10685 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
10686 old_pass_arg = argpos;
10688 /* Check that the names correspond. */
10689 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
10691 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
10692 " to match the corresponding argument of the overridden"
10693 " procedure", proc_formal->sym->name, proc->name, &where,
10694 old_formal->sym->name);
10698 /* Check that the types correspond if neither is the passed-object
10700 /* FIXME: Do more comprehensive testing here. */
10701 if (proc_pass_arg != argpos && old_pass_arg != argpos
10702 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
10704 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
10705 "in respect to the overridden procedure",
10706 proc_formal->sym->name, proc->name, &where);
10712 if (proc_formal || old_formal)
10714 gfc_error ("'%s' at %L must have the same number of formal arguments as"
10715 " the overridden procedure", proc->name, &where);
10719 /* If the overridden binding is NOPASS, the overriding one must also be
10721 if (old->n.tb->nopass && !proc->n.tb->nopass)
10723 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
10724 " NOPASS", proc->name, &where);
10728 /* If the overridden binding is PASS(x), the overriding one must also be
10729 PASS and the passed-object dummy arguments must correspond. */
10730 if (!old->n.tb->nopass)
10732 if (proc->n.tb->nopass)
10734 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
10735 " PASS", proc->name, &where);
10739 if (proc_pass_arg != old_pass_arg)
10741 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
10742 " the same position as the passed-object dummy argument of"
10743 " the overridden procedure", proc->name, &where);
10752 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10755 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10756 const char* generic_name, locus where)
10761 gcc_assert (t1->specific && t2->specific);
10762 gcc_assert (!t1->specific->is_generic);
10763 gcc_assert (!t2->specific->is_generic);
10765 sym1 = t1->specific->u.specific->n.sym;
10766 sym2 = t2->specific->u.specific->n.sym;
10771 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10772 if (sym1->attr.subroutine != sym2->attr.subroutine
10773 || sym1->attr.function != sym2->attr.function)
10775 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10776 " GENERIC '%s' at %L",
10777 sym1->name, sym2->name, generic_name, &where);
10781 /* Compare the interfaces. */
10782 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10784 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10785 sym1->name, sym2->name, generic_name, &where);
10793 /* Worker function for resolving a generic procedure binding; this is used to
10794 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10796 The difference between those cases is finding possible inherited bindings
10797 that are overridden, as one has to look for them in tb_sym_root,
10798 tb_uop_root or tb_op, respectively. Thus the caller must already find
10799 the super-type and set p->overridden correctly. */
10802 resolve_tb_generic_targets (gfc_symbol* super_type,
10803 gfc_typebound_proc* p, const char* name)
10805 gfc_tbp_generic* target;
10806 gfc_symtree* first_target;
10807 gfc_symtree* inherited;
10809 gcc_assert (p && p->is_generic);
10811 /* Try to find the specific bindings for the symtrees in our target-list. */
10812 gcc_assert (p->u.generic);
10813 for (target = p->u.generic; target; target = target->next)
10814 if (!target->specific)
10816 gfc_typebound_proc* overridden_tbp;
10817 gfc_tbp_generic* g;
10818 const char* target_name;
10820 target_name = target->specific_st->name;
10822 /* Defined for this type directly. */
10823 if (target->specific_st->n.tb && !target->specific_st->n.tb->error)
10825 target->specific = target->specific_st->n.tb;
10826 goto specific_found;
10829 /* Look for an inherited specific binding. */
10832 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10837 gcc_assert (inherited->n.tb);
10838 target->specific = inherited->n.tb;
10839 goto specific_found;
10843 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10844 " at %L", target_name, name, &p->where);
10847 /* Once we've found the specific binding, check it is not ambiguous with
10848 other specifics already found or inherited for the same GENERIC. */
10850 gcc_assert (target->specific);
10852 /* This must really be a specific binding! */
10853 if (target->specific->is_generic)
10855 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10856 " '%s' is GENERIC, too", name, &p->where, target_name);
10860 /* Check those already resolved on this type directly. */
10861 for (g = p->u.generic; g; g = g->next)
10862 if (g != target && g->specific
10863 && check_generic_tbp_ambiguity (target, g, name, p->where)
10867 /* Check for ambiguity with inherited specific targets. */
10868 for (overridden_tbp = p->overridden; overridden_tbp;
10869 overridden_tbp = overridden_tbp->overridden)
10870 if (overridden_tbp->is_generic)
10872 for (g = overridden_tbp->u.generic; g; g = g->next)
10874 gcc_assert (g->specific);
10875 if (check_generic_tbp_ambiguity (target, g,
10876 name, p->where) == FAILURE)
10882 /* If we attempt to "overwrite" a specific binding, this is an error. */
10883 if (p->overridden && !p->overridden->is_generic)
10885 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10886 " the same name", name, &p->where);
10890 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10891 all must have the same attributes here. */
10892 first_target = p->u.generic->specific->u.specific;
10893 gcc_assert (first_target);
10894 p->subroutine = first_target->n.sym->attr.subroutine;
10895 p->function = first_target->n.sym->attr.function;
10901 /* Resolve a GENERIC procedure binding for a derived type. */
10904 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10906 gfc_symbol* super_type;
10908 /* Find the overridden binding if any. */
10909 st->n.tb->overridden = NULL;
10910 super_type = gfc_get_derived_super_type (derived);
10913 gfc_symtree* overridden;
10914 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10917 if (overridden && overridden->n.tb)
10918 st->n.tb->overridden = overridden->n.tb;
10921 /* Resolve using worker function. */
10922 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10926 /* Retrieve the target-procedure of an operator binding and do some checks in
10927 common for intrinsic and user-defined type-bound operators. */
10930 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10932 gfc_symbol* target_proc;
10934 gcc_assert (target->specific && !target->specific->is_generic);
10935 target_proc = target->specific->u.specific->n.sym;
10936 gcc_assert (target_proc);
10938 /* All operator bindings must have a passed-object dummy argument. */
10939 if (target->specific->nopass)
10941 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10945 return target_proc;
10949 /* Resolve a type-bound intrinsic operator. */
10952 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10953 gfc_typebound_proc* p)
10955 gfc_symbol* super_type;
10956 gfc_tbp_generic* target;
10958 /* If there's already an error here, do nothing (but don't fail again). */
10962 /* Operators should always be GENERIC bindings. */
10963 gcc_assert (p->is_generic);
10965 /* Look for an overridden binding. */
10966 super_type = gfc_get_derived_super_type (derived);
10967 if (super_type && super_type->f2k_derived)
10968 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
10971 p->overridden = NULL;
10973 /* Resolve general GENERIC properties using worker function. */
10974 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
10977 /* Check the targets to be procedures of correct interface. */
10978 for (target = p->u.generic; target; target = target->next)
10980 gfc_symbol* target_proc;
10982 target_proc = get_checked_tb_operator_target (target, p->where);
10986 if (!gfc_check_operator_interface (target_proc, op, p->where))
10998 /* Resolve a type-bound user operator (tree-walker callback). */
11000 static gfc_symbol* resolve_bindings_derived;
11001 static gfc_try resolve_bindings_result;
11003 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
11006 resolve_typebound_user_op (gfc_symtree* stree)
11008 gfc_symbol* super_type;
11009 gfc_tbp_generic* target;
11011 gcc_assert (stree && stree->n.tb);
11013 if (stree->n.tb->error)
11016 /* Operators should always be GENERIC bindings. */
11017 gcc_assert (stree->n.tb->is_generic);
11019 /* Find overridden procedure, if any. */
11020 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
11021 if (super_type && super_type->f2k_derived)
11023 gfc_symtree* overridden;
11024 overridden = gfc_find_typebound_user_op (super_type, NULL,
11025 stree->name, true, NULL);
11027 if (overridden && overridden->n.tb)
11028 stree->n.tb->overridden = overridden->n.tb;
11031 stree->n.tb->overridden = NULL;
11033 /* Resolve basically using worker function. */
11034 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
11038 /* Check the targets to be functions of correct interface. */
11039 for (target = stree->n.tb->u.generic; target; target = target->next)
11041 gfc_symbol* target_proc;
11043 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
11047 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
11054 resolve_bindings_result = FAILURE;
11055 stree->n.tb->error = 1;
11059 /* Resolve the type-bound procedures for a derived type. */
11062 resolve_typebound_procedure (gfc_symtree* stree)
11066 gfc_symbol* me_arg;
11067 gfc_symbol* super_type;
11068 gfc_component* comp;
11070 gcc_assert (stree);
11072 /* Undefined specific symbol from GENERIC target definition. */
11076 if (stree->n.tb->error)
11079 /* If this is a GENERIC binding, use that routine. */
11080 if (stree->n.tb->is_generic)
11082 if (resolve_typebound_generic (resolve_bindings_derived, stree)
11088 /* Get the target-procedure to check it. */
11089 gcc_assert (!stree->n.tb->is_generic);
11090 gcc_assert (stree->n.tb->u.specific);
11091 proc = stree->n.tb->u.specific->n.sym;
11092 where = stree->n.tb->where;
11094 /* Default access should already be resolved from the parser. */
11095 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
11097 /* It should be a module procedure or an external procedure with explicit
11098 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
11099 if ((!proc->attr.subroutine && !proc->attr.function)
11100 || (proc->attr.proc != PROC_MODULE
11101 && proc->attr.if_source != IFSRC_IFBODY)
11102 || (proc->attr.abstract && !stree->n.tb->deferred))
11104 gfc_error ("'%s' must be a module procedure or an external procedure with"
11105 " an explicit interface at %L", proc->name, &where);
11108 stree->n.tb->subroutine = proc->attr.subroutine;
11109 stree->n.tb->function = proc->attr.function;
11111 /* Find the super-type of the current derived type. We could do this once and
11112 store in a global if speed is needed, but as long as not I believe this is
11113 more readable and clearer. */
11114 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
11116 /* If PASS, resolve and check arguments if not already resolved / loaded
11117 from a .mod file. */
11118 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
11120 if (stree->n.tb->pass_arg)
11122 gfc_formal_arglist* i;
11124 /* If an explicit passing argument name is given, walk the arg-list
11125 and look for it. */
11128 stree->n.tb->pass_arg_num = 1;
11129 for (i = proc->formal; i; i = i->next)
11131 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
11136 ++stree->n.tb->pass_arg_num;
11141 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
11143 proc->name, stree->n.tb->pass_arg, &where,
11144 stree->n.tb->pass_arg);
11150 /* Otherwise, take the first one; there should in fact be at least
11152 stree->n.tb->pass_arg_num = 1;
11155 gfc_error ("Procedure '%s' with PASS at %L must have at"
11156 " least one argument", proc->name, &where);
11159 me_arg = proc->formal->sym;
11162 /* Now check that the argument-type matches and the passed-object
11163 dummy argument is generally fine. */
11165 gcc_assert (me_arg);
11167 if (me_arg->ts.type != BT_CLASS)
11169 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11170 " at %L", proc->name, &where);
11174 if (CLASS_DATA (me_arg)->ts.u.derived
11175 != resolve_bindings_derived)
11177 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11178 " the derived-type '%s'", me_arg->name, proc->name,
11179 me_arg->name, &where, resolve_bindings_derived->name);
11183 gcc_assert (me_arg->ts.type == BT_CLASS);
11184 if (CLASS_DATA (me_arg)->as && CLASS_DATA (me_arg)->as->rank > 0)
11186 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
11187 " scalar", proc->name, &where);
11190 if (CLASS_DATA (me_arg)->attr.allocatable)
11192 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11193 " be ALLOCATABLE", proc->name, &where);
11196 if (CLASS_DATA (me_arg)->attr.class_pointer)
11198 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11199 " be POINTER", proc->name, &where);
11204 /* If we are extending some type, check that we don't override a procedure
11205 flagged NON_OVERRIDABLE. */
11206 stree->n.tb->overridden = NULL;
11209 gfc_symtree* overridden;
11210 overridden = gfc_find_typebound_proc (super_type, NULL,
11211 stree->name, true, NULL);
11213 if (overridden && overridden->n.tb)
11214 stree->n.tb->overridden = overridden->n.tb;
11216 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
11220 /* See if there's a name collision with a component directly in this type. */
11221 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
11222 if (!strcmp (comp->name, stree->name))
11224 gfc_error ("Procedure '%s' at %L has the same name as a component of"
11226 stree->name, &where, resolve_bindings_derived->name);
11230 /* Try to find a name collision with an inherited component. */
11231 if (super_type && gfc_find_component (super_type, stree->name, true, true))
11233 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
11234 " component of '%s'",
11235 stree->name, &where, resolve_bindings_derived->name);
11239 stree->n.tb->error = 0;
11243 resolve_bindings_result = FAILURE;
11244 stree->n.tb->error = 1;
11249 resolve_typebound_procedures (gfc_symbol* derived)
11253 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
11256 resolve_bindings_derived = derived;
11257 resolve_bindings_result = SUCCESS;
11259 /* Make sure the vtab has been generated. */
11260 gfc_find_derived_vtab (derived);
11262 if (derived->f2k_derived->tb_sym_root)
11263 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
11264 &resolve_typebound_procedure);
11266 if (derived->f2k_derived->tb_uop_root)
11267 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
11268 &resolve_typebound_user_op);
11270 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
11272 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
11273 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
11275 resolve_bindings_result = FAILURE;
11278 return resolve_bindings_result;
11282 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
11283 to give all identical derived types the same backend_decl. */
11285 add_dt_to_dt_list (gfc_symbol *derived)
11287 gfc_dt_list *dt_list;
11289 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
11290 if (derived == dt_list->derived)
11293 dt_list = gfc_get_dt_list ();
11294 dt_list->next = gfc_derived_types;
11295 dt_list->derived = derived;
11296 gfc_derived_types = dt_list;
11300 /* Ensure that a derived-type is really not abstract, meaning that every
11301 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
11304 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
11309 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
11311 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
11314 if (st->n.tb && st->n.tb->deferred)
11316 gfc_symtree* overriding;
11317 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
11320 gcc_assert (overriding->n.tb);
11321 if (overriding->n.tb->deferred)
11323 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
11324 " '%s' is DEFERRED and not overridden",
11325 sub->name, &sub->declared_at, st->name);
11334 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
11336 /* The algorithm used here is to recursively travel up the ancestry of sub
11337 and for each ancestor-type, check all bindings. If any of them is
11338 DEFERRED, look it up starting from sub and see if the found (overriding)
11339 binding is not DEFERRED.
11340 This is not the most efficient way to do this, but it should be ok and is
11341 clearer than something sophisticated. */
11343 gcc_assert (ancestor && !sub->attr.abstract);
11345 if (!ancestor->attr.abstract)
11348 /* Walk bindings of this ancestor. */
11349 if (ancestor->f2k_derived)
11352 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
11357 /* Find next ancestor type and recurse on it. */
11358 ancestor = gfc_get_derived_super_type (ancestor);
11360 return ensure_not_abstract (sub, ancestor);
11366 /* Resolve the components of a derived type. */
11369 resolve_fl_derived (gfc_symbol *sym)
11371 gfc_symbol* super_type;
11374 super_type = gfc_get_derived_super_type (sym);
11376 if (sym->attr.is_class && sym->ts.u.derived == NULL)
11378 /* Fix up incomplete CLASS symbols. */
11379 gfc_component *data = gfc_find_component (sym, "_data", true, true);
11380 gfc_component *vptr = gfc_find_component (sym, "_vptr", true, true);
11381 if (vptr->ts.u.derived == NULL)
11383 gfc_symbol *vtab = gfc_find_derived_vtab (data->ts.u.derived);
11385 vptr->ts.u.derived = vtab->ts.u.derived;
11390 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
11392 gfc_error ("As extending type '%s' at %L has a coarray component, "
11393 "parent type '%s' shall also have one", sym->name,
11394 &sym->declared_at, super_type->name);
11398 /* Ensure the extended type gets resolved before we do. */
11399 if (super_type && resolve_fl_derived (super_type) == FAILURE)
11402 /* An ABSTRACT type must be extensible. */
11403 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
11405 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
11406 sym->name, &sym->declared_at);
11410 for (c = sym->components; c != NULL; c = c->next)
11413 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
11414 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
11416 gfc_error ("Coarray component '%s' at %L must be allocatable with "
11417 "deferred shape", c->name, &c->loc);
11422 if (c->attr.codimension && c->ts.type == BT_DERIVED
11423 && c->ts.u.derived->ts.is_iso_c)
11425 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11426 "shall not be a coarray", c->name, &c->loc);
11431 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
11432 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
11433 || c->attr.allocatable))
11435 gfc_error ("Component '%s' at %L with coarray component "
11436 "shall be a nonpointer, nonallocatable scalar",
11442 if (c->attr.contiguous && (!c->attr.dimension || !c->attr.pointer))
11444 gfc_error ("Component '%s' at %L has the CONTIGUOUS attribute but "
11445 "is not an array pointer", c->name, &c->loc);
11449 if (c->attr.proc_pointer && c->ts.interface)
11451 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
11452 gfc_error ("Interface '%s', used by procedure pointer component "
11453 "'%s' at %L, is declared in a later PROCEDURE statement",
11454 c->ts.interface->name, c->name, &c->loc);
11456 /* Get the attributes from the interface (now resolved). */
11457 if (c->ts.interface->attr.if_source
11458 || c->ts.interface->attr.intrinsic)
11460 gfc_symbol *ifc = c->ts.interface;
11462 if (ifc->formal && !ifc->formal_ns)
11463 resolve_symbol (ifc);
11465 if (ifc->attr.intrinsic)
11466 resolve_intrinsic (ifc, &ifc->declared_at);
11470 c->ts = ifc->result->ts;
11471 c->attr.allocatable = ifc->result->attr.allocatable;
11472 c->attr.pointer = ifc->result->attr.pointer;
11473 c->attr.dimension = ifc->result->attr.dimension;
11474 c->as = gfc_copy_array_spec (ifc->result->as);
11479 c->attr.allocatable = ifc->attr.allocatable;
11480 c->attr.pointer = ifc->attr.pointer;
11481 c->attr.dimension = ifc->attr.dimension;
11482 c->as = gfc_copy_array_spec (ifc->as);
11484 c->ts.interface = ifc;
11485 c->attr.function = ifc->attr.function;
11486 c->attr.subroutine = ifc->attr.subroutine;
11487 gfc_copy_formal_args_ppc (c, ifc);
11489 c->attr.pure = ifc->attr.pure;
11490 c->attr.elemental = ifc->attr.elemental;
11491 c->attr.recursive = ifc->attr.recursive;
11492 c->attr.always_explicit = ifc->attr.always_explicit;
11493 c->attr.ext_attr |= ifc->attr.ext_attr;
11494 /* Replace symbols in array spec. */
11498 for (i = 0; i < c->as->rank; i++)
11500 gfc_expr_replace_comp (c->as->lower[i], c);
11501 gfc_expr_replace_comp (c->as->upper[i], c);
11504 /* Copy char length. */
11505 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11507 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11508 gfc_expr_replace_comp (cl->length, c);
11509 if (cl->length && !cl->resolved
11510 && gfc_resolve_expr (cl->length) == FAILURE)
11515 else if (!sym->attr.vtype && c->ts.interface->name[0] != '\0')
11517 gfc_error ("Interface '%s' of procedure pointer component "
11518 "'%s' at %L must be explicit", c->ts.interface->name,
11523 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
11525 /* Since PPCs are not implicitly typed, a PPC without an explicit
11526 interface must be a subroutine. */
11527 gfc_add_subroutine (&c->attr, c->name, &c->loc);
11530 /* Procedure pointer components: Check PASS arg. */
11531 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
11532 && !sym->attr.vtype)
11534 gfc_symbol* me_arg;
11536 if (c->tb->pass_arg)
11538 gfc_formal_arglist* i;
11540 /* If an explicit passing argument name is given, walk the arg-list
11541 and look for it. */
11544 c->tb->pass_arg_num = 1;
11545 for (i = c->formal; i; i = i->next)
11547 if (!strcmp (i->sym->name, c->tb->pass_arg))
11552 c->tb->pass_arg_num++;
11557 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
11558 "at %L has no argument '%s'", c->name,
11559 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
11566 /* Otherwise, take the first one; there should in fact be at least
11568 c->tb->pass_arg_num = 1;
11571 gfc_error ("Procedure pointer component '%s' with PASS at %L "
11572 "must have at least one argument",
11577 me_arg = c->formal->sym;
11580 /* Now check that the argument-type matches. */
11581 gcc_assert (me_arg);
11582 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
11583 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
11584 || (me_arg->ts.type == BT_CLASS
11585 && CLASS_DATA (me_arg)->ts.u.derived != sym))
11587 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11588 " the derived type '%s'", me_arg->name, c->name,
11589 me_arg->name, &c->loc, sym->name);
11594 /* Check for C453. */
11595 if (me_arg->attr.dimension)
11597 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11598 "must be scalar", me_arg->name, c->name, me_arg->name,
11604 if (me_arg->attr.pointer)
11606 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11607 "may not have the POINTER attribute", me_arg->name,
11608 c->name, me_arg->name, &c->loc);
11613 if (me_arg->attr.allocatable)
11615 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11616 "may not be ALLOCATABLE", me_arg->name, c->name,
11617 me_arg->name, &c->loc);
11622 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
11623 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11624 " at %L", c->name, &c->loc);
11628 /* Check type-spec if this is not the parent-type component. */
11629 if ((!sym->attr.extension || c != sym->components) && !sym->attr.vtype
11630 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
11633 /* If this type is an extension, set the accessibility of the parent
11635 if (super_type && c == sym->components
11636 && strcmp (super_type->name, c->name) == 0)
11637 c->attr.access = super_type->attr.access;
11639 /* If this type is an extension, see if this component has the same name
11640 as an inherited type-bound procedure. */
11641 if (super_type && !sym->attr.is_class
11642 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
11644 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
11645 " inherited type-bound procedure",
11646 c->name, sym->name, &c->loc);
11650 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer
11651 && !c->ts.deferred)
11653 if (c->ts.u.cl->length == NULL
11654 || (resolve_charlen (c->ts.u.cl) == FAILURE)
11655 || !gfc_is_constant_expr (c->ts.u.cl->length))
11657 gfc_error ("Character length of component '%s' needs to "
11658 "be a constant specification expression at %L",
11660 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
11665 if (c->ts.type == BT_CHARACTER && c->ts.deferred
11666 && !c->attr.pointer && !c->attr.allocatable)
11668 gfc_error ("Character component '%s' of '%s' at %L with deferred "
11669 "length must be a POINTER or ALLOCATABLE",
11670 c->name, sym->name, &c->loc);
11674 if (c->ts.type == BT_DERIVED
11675 && sym->component_access != ACCESS_PRIVATE
11676 && gfc_check_symbol_access (sym)
11677 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
11678 && !c->ts.u.derived->attr.use_assoc
11679 && !gfc_check_symbol_access (c->ts.u.derived)
11680 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
11681 "is a PRIVATE type and cannot be a component of "
11682 "'%s', which is PUBLIC at %L", c->name,
11683 sym->name, &sym->declared_at) == FAILURE)
11686 if ((sym->attr.sequence || sym->attr.is_bind_c) && c->ts.type == BT_CLASS)
11688 gfc_error ("Polymorphic component %s at %L in SEQUENCE or BIND(C) "
11689 "type %s", c->name, &c->loc, sym->name);
11693 if (sym->attr.sequence)
11695 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
11697 gfc_error ("Component %s of SEQUENCE type declared at %L does "
11698 "not have the SEQUENCE attribute",
11699 c->ts.u.derived->name, &sym->declared_at);
11704 if (!sym->attr.is_class && c->ts.type == BT_DERIVED && !sym->attr.vtype
11705 && c->attr.pointer && c->ts.u.derived->components == NULL
11706 && !c->ts.u.derived->attr.zero_comp)
11708 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11709 "that has not been declared", c->name, sym->name,
11714 if (c->ts.type == BT_CLASS && CLASS_DATA (c)->attr.class_pointer
11715 && CLASS_DATA (c)->ts.u.derived->components == NULL
11716 && !CLASS_DATA (c)->ts.u.derived->attr.zero_comp)
11718 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11719 "that has not been declared", c->name, sym->name,
11725 if (c->ts.type == BT_CLASS
11726 && !(CLASS_DATA (c)->attr.class_pointer
11727 || CLASS_DATA (c)->attr.allocatable))
11729 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
11730 "or pointer", c->name, &c->loc);
11734 /* Ensure that all the derived type components are put on the
11735 derived type list; even in formal namespaces, where derived type
11736 pointer components might not have been declared. */
11737 if (c->ts.type == BT_DERIVED
11739 && c->ts.u.derived->components
11741 && sym != c->ts.u.derived)
11742 add_dt_to_dt_list (c->ts.u.derived);
11744 if (gfc_resolve_array_spec (c->as, !(c->attr.pointer
11745 || c->attr.proc_pointer
11746 || c->attr.allocatable)) == FAILURE)
11750 /* Resolve the type-bound procedures. */
11751 if (resolve_typebound_procedures (sym) == FAILURE)
11754 /* Resolve the finalizer procedures. */
11755 if (gfc_resolve_finalizers (sym) == FAILURE)
11758 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11759 all DEFERRED bindings are overridden. */
11760 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11761 && !sym->attr.is_class
11762 && ensure_not_abstract (sym, super_type) == FAILURE)
11765 /* Add derived type to the derived type list. */
11766 add_dt_to_dt_list (sym);
11773 resolve_fl_namelist (gfc_symbol *sym)
11778 for (nl = sym->namelist; nl; nl = nl->next)
11780 /* Check again, the check in match only works if NAMELIST comes
11782 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SIZE)
11784 gfc_error ("Assumed size array '%s' in namelist '%s' at %L is not "
11785 "allowed", nl->sym->name, sym->name, &sym->declared_at);
11789 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11790 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11791 "object '%s' with assumed shape in namelist "
11792 "'%s' at %L", nl->sym->name, sym->name,
11793 &sym->declared_at) == FAILURE)
11796 if (is_non_constant_shape_array (nl->sym)
11797 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11798 "object '%s' with nonconstant shape in namelist "
11799 "'%s' at %L", nl->sym->name, sym->name,
11800 &sym->declared_at) == FAILURE)
11803 if (nl->sym->ts.type == BT_CHARACTER
11804 && (nl->sym->ts.u.cl->length == NULL
11805 || !gfc_is_constant_expr (nl->sym->ts.u.cl->length))
11806 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11807 "'%s' with nonconstant character length in "
11808 "namelist '%s' at %L", nl->sym->name, sym->name,
11809 &sym->declared_at) == FAILURE)
11812 /* FIXME: Once UDDTIO is implemented, the following can be
11814 if (nl->sym->ts.type == BT_CLASS)
11816 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L is "
11817 "polymorphic and requires a defined input/output "
11818 "procedure", nl->sym->name, sym->name, &sym->declared_at);
11822 if (nl->sym->ts.type == BT_DERIVED
11823 && (nl->sym->ts.u.derived->attr.alloc_comp
11824 || nl->sym->ts.u.derived->attr.pointer_comp))
11826 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11827 "'%s' in namelist '%s' at %L with ALLOCATABLE "
11828 "or POINTER components", nl->sym->name,
11829 sym->name, &sym->declared_at) == FAILURE)
11832 /* FIXME: Once UDDTIO is implemented, the following can be
11834 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L has "
11835 "ALLOCATABLE or POINTER components and thus requires "
11836 "a defined input/output procedure", nl->sym->name,
11837 sym->name, &sym->declared_at);
11842 /* Reject PRIVATE objects in a PUBLIC namelist. */
11843 if (gfc_check_symbol_access (sym))
11845 for (nl = sym->namelist; nl; nl = nl->next)
11847 if (!nl->sym->attr.use_assoc
11848 && !is_sym_host_assoc (nl->sym, sym->ns)
11849 && !gfc_check_symbol_access (nl->sym))
11851 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11852 "cannot be member of PUBLIC namelist '%s' at %L",
11853 nl->sym->name, sym->name, &sym->declared_at);
11857 /* Types with private components that came here by USE-association. */
11858 if (nl->sym->ts.type == BT_DERIVED
11859 && derived_inaccessible (nl->sym->ts.u.derived))
11861 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11862 "components and cannot be member of namelist '%s' at %L",
11863 nl->sym->name, sym->name, &sym->declared_at);
11867 /* Types with private components that are defined in the same module. */
11868 if (nl->sym->ts.type == BT_DERIVED
11869 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11870 && nl->sym->ts.u.derived->attr.private_comp)
11872 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11873 "cannot be a member of PUBLIC namelist '%s' at %L",
11874 nl->sym->name, sym->name, &sym->declared_at);
11881 /* 14.1.2 A module or internal procedure represent local entities
11882 of the same type as a namelist member and so are not allowed. */
11883 for (nl = sym->namelist; nl; nl = nl->next)
11885 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11888 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11889 if ((nl->sym == sym->ns->proc_name)
11891 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11895 if (nl->sym && nl->sym->name)
11896 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11897 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11899 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11900 "attribute in '%s' at %L", nlsym->name,
11901 &sym->declared_at);
11911 resolve_fl_parameter (gfc_symbol *sym)
11913 /* A parameter array's shape needs to be constant. */
11914 if (sym->as != NULL
11915 && (sym->as->type == AS_DEFERRED
11916 || is_non_constant_shape_array (sym)))
11918 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11919 "or of deferred shape", sym->name, &sym->declared_at);
11923 /* Make sure a parameter that has been implicitly typed still
11924 matches the implicit type, since PARAMETER statements can precede
11925 IMPLICIT statements. */
11926 if (sym->attr.implicit_type
11927 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11930 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11931 "later IMPLICIT type", sym->name, &sym->declared_at);
11935 /* Make sure the types of derived parameters are consistent. This
11936 type checking is deferred until resolution because the type may
11937 refer to a derived type from the host. */
11938 if (sym->ts.type == BT_DERIVED
11939 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11941 gfc_error ("Incompatible derived type in PARAMETER at %L",
11942 &sym->value->where);
11949 /* Do anything necessary to resolve a symbol. Right now, we just
11950 assume that an otherwise unknown symbol is a variable. This sort
11951 of thing commonly happens for symbols in module. */
11954 resolve_symbol (gfc_symbol *sym)
11956 int check_constant, mp_flag;
11957 gfc_symtree *symtree;
11958 gfc_symtree *this_symtree;
11962 /* Avoid double resolution of function result symbols. */
11963 if ((sym->result || sym->attr.result) && !sym->attr.dummy
11964 && (sym->ns != gfc_current_ns))
11967 if (sym->attr.flavor == FL_UNKNOWN)
11970 /* If we find that a flavorless symbol is an interface in one of the
11971 parent namespaces, find its symtree in this namespace, free the
11972 symbol and set the symtree to point to the interface symbol. */
11973 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
11975 symtree = gfc_find_symtree (ns->sym_root, sym->name);
11976 if (symtree && (symtree->n.sym->generic ||
11977 (symtree->n.sym->attr.flavor == FL_PROCEDURE
11978 && sym->ns->construct_entities)))
11980 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
11982 gfc_release_symbol (sym);
11983 symtree->n.sym->refs++;
11984 this_symtree->n.sym = symtree->n.sym;
11989 /* Otherwise give it a flavor according to such attributes as
11991 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
11992 sym->attr.flavor = FL_VARIABLE;
11995 sym->attr.flavor = FL_PROCEDURE;
11996 if (sym->attr.dimension)
11997 sym->attr.function = 1;
12001 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
12002 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
12004 if (sym->attr.procedure && sym->ts.interface
12005 && sym->attr.if_source != IFSRC_DECL
12006 && resolve_procedure_interface (sym) == FAILURE)
12009 if (sym->attr.is_protected && !sym->attr.proc_pointer
12010 && (sym->attr.procedure || sym->attr.external))
12012 if (sym->attr.external)
12013 gfc_error ("PROTECTED attribute conflicts with EXTERNAL attribute "
12014 "at %L", &sym->declared_at);
12016 gfc_error ("PROCEDURE attribute conflicts with PROTECTED attribute "
12017 "at %L", &sym->declared_at);
12024 if (sym->attr.contiguous
12025 && (!sym->attr.dimension || (sym->as->type != AS_ASSUMED_SHAPE
12026 && !sym->attr.pointer)))
12028 gfc_error ("'%s' at %L has the CONTIGUOUS attribute but is not an "
12029 "array pointer or an assumed-shape array", sym->name,
12030 &sym->declared_at);
12034 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
12037 /* Symbols that are module procedures with results (functions) have
12038 the types and array specification copied for type checking in
12039 procedures that call them, as well as for saving to a module
12040 file. These symbols can't stand the scrutiny that their results
12042 mp_flag = (sym->result != NULL && sym->result != sym);
12044 /* Make sure that the intrinsic is consistent with its internal
12045 representation. This needs to be done before assigning a default
12046 type to avoid spurious warnings. */
12047 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
12048 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
12051 /* Resolve associate names. */
12053 resolve_assoc_var (sym, true);
12055 /* Assign default type to symbols that need one and don't have one. */
12056 if (sym->ts.type == BT_UNKNOWN)
12058 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
12059 gfc_set_default_type (sym, 1, NULL);
12061 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
12062 && !sym->attr.function && !sym->attr.subroutine
12063 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
12064 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
12066 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
12068 /* The specific case of an external procedure should emit an error
12069 in the case that there is no implicit type. */
12071 gfc_set_default_type (sym, sym->attr.external, NULL);
12074 /* Result may be in another namespace. */
12075 resolve_symbol (sym->result);
12077 if (!sym->result->attr.proc_pointer)
12079 sym->ts = sym->result->ts;
12080 sym->as = gfc_copy_array_spec (sym->result->as);
12081 sym->attr.dimension = sym->result->attr.dimension;
12082 sym->attr.pointer = sym->result->attr.pointer;
12083 sym->attr.allocatable = sym->result->attr.allocatable;
12084 sym->attr.contiguous = sym->result->attr.contiguous;
12090 /* Assumed size arrays and assumed shape arrays must be dummy
12091 arguments. Array-spec's of implied-shape should have been resolved to
12092 AS_EXPLICIT already. */
12096 gcc_assert (sym->as->type != AS_IMPLIED_SHAPE);
12097 if (((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
12098 || sym->as->type == AS_ASSUMED_SHAPE)
12099 && sym->attr.dummy == 0)
12101 if (sym->as->type == AS_ASSUMED_SIZE)
12102 gfc_error ("Assumed size array at %L must be a dummy argument",
12103 &sym->declared_at);
12105 gfc_error ("Assumed shape array at %L must be a dummy argument",
12106 &sym->declared_at);
12111 /* Make sure symbols with known intent or optional are really dummy
12112 variable. Because of ENTRY statement, this has to be deferred
12113 until resolution time. */
12115 if (!sym->attr.dummy
12116 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
12118 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
12122 if (sym->attr.value && !sym->attr.dummy)
12124 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
12125 "it is not a dummy argument", sym->name, &sym->declared_at);
12129 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
12131 gfc_charlen *cl = sym->ts.u.cl;
12132 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
12134 gfc_error ("Character dummy variable '%s' at %L with VALUE "
12135 "attribute must have constant length",
12136 sym->name, &sym->declared_at);
12140 if (sym->ts.is_c_interop
12141 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
12143 gfc_error ("C interoperable character dummy variable '%s' at %L "
12144 "with VALUE attribute must have length one",
12145 sym->name, &sym->declared_at);
12150 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
12151 do this for something that was implicitly typed because that is handled
12152 in gfc_set_default_type. Handle dummy arguments and procedure
12153 definitions separately. Also, anything that is use associated is not
12154 handled here but instead is handled in the module it is declared in.
12155 Finally, derived type definitions are allowed to be BIND(C) since that
12156 only implies that they're interoperable, and they are checked fully for
12157 interoperability when a variable is declared of that type. */
12158 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
12159 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
12160 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
12162 gfc_try t = SUCCESS;
12164 /* First, make sure the variable is declared at the
12165 module-level scope (J3/04-007, Section 15.3). */
12166 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
12167 sym->attr.in_common == 0)
12169 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
12170 "is neither a COMMON block nor declared at the "
12171 "module level scope", sym->name, &(sym->declared_at));
12174 else if (sym->common_head != NULL)
12176 t = verify_com_block_vars_c_interop (sym->common_head);
12180 /* If type() declaration, we need to verify that the components
12181 of the given type are all C interoperable, etc. */
12182 if (sym->ts.type == BT_DERIVED &&
12183 sym->ts.u.derived->attr.is_c_interop != 1)
12185 /* Make sure the user marked the derived type as BIND(C). If
12186 not, call the verify routine. This could print an error
12187 for the derived type more than once if multiple variables
12188 of that type are declared. */
12189 if (sym->ts.u.derived->attr.is_bind_c != 1)
12190 verify_bind_c_derived_type (sym->ts.u.derived);
12194 /* Verify the variable itself as C interoperable if it
12195 is BIND(C). It is not possible for this to succeed if
12196 the verify_bind_c_derived_type failed, so don't have to handle
12197 any error returned by verify_bind_c_derived_type. */
12198 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
12199 sym->common_block);
12204 /* clear the is_bind_c flag to prevent reporting errors more than
12205 once if something failed. */
12206 sym->attr.is_bind_c = 0;
12211 /* If a derived type symbol has reached this point, without its
12212 type being declared, we have an error. Notice that most
12213 conditions that produce undefined derived types have already
12214 been dealt with. However, the likes of:
12215 implicit type(t) (t) ..... call foo (t) will get us here if
12216 the type is not declared in the scope of the implicit
12217 statement. Change the type to BT_UNKNOWN, both because it is so
12218 and to prevent an ICE. */
12219 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
12220 && !sym->ts.u.derived->attr.zero_comp)
12222 gfc_error ("The derived type '%s' at %L is of type '%s', "
12223 "which has not been defined", sym->name,
12224 &sym->declared_at, sym->ts.u.derived->name);
12225 sym->ts.type = BT_UNKNOWN;
12229 /* Make sure that the derived type has been resolved and that the
12230 derived type is visible in the symbol's namespace, if it is a
12231 module function and is not PRIVATE. */
12232 if (sym->ts.type == BT_DERIVED
12233 && sym->ts.u.derived->attr.use_assoc
12234 && sym->ns->proc_name
12235 && sym->ns->proc_name->attr.flavor == FL_MODULE)
12239 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
12242 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
12243 if (!ds && sym->attr.function && gfc_check_symbol_access (sym))
12245 symtree = gfc_new_symtree (&sym->ns->sym_root,
12246 sym->ts.u.derived->name);
12247 symtree->n.sym = sym->ts.u.derived;
12248 sym->ts.u.derived->refs++;
12252 /* Unless the derived-type declaration is use associated, Fortran 95
12253 does not allow public entries of private derived types.
12254 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
12255 161 in 95-006r3. */
12256 if (sym->ts.type == BT_DERIVED
12257 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
12258 && !sym->ts.u.derived->attr.use_assoc
12259 && gfc_check_symbol_access (sym)
12260 && !gfc_check_symbol_access (sym->ts.u.derived)
12261 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
12262 "of PRIVATE derived type '%s'",
12263 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
12264 : "variable", sym->name, &sym->declared_at,
12265 sym->ts.u.derived->name) == FAILURE)
12268 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
12269 default initialization is defined (5.1.2.4.4). */
12270 if (sym->ts.type == BT_DERIVED
12272 && sym->attr.intent == INTENT_OUT
12274 && sym->as->type == AS_ASSUMED_SIZE)
12276 for (c = sym->ts.u.derived->components; c; c = c->next)
12278 if (c->initializer)
12280 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
12281 "ASSUMED SIZE and so cannot have a default initializer",
12282 sym->name, &sym->declared_at);
12289 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12290 || sym->attr.codimension)
12291 && sym->attr.result)
12292 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
12293 "a coarray component", sym->name, &sym->declared_at);
12296 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
12297 && sym->ts.u.derived->ts.is_iso_c)
12298 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
12299 "shall not be a coarray", sym->name, &sym->declared_at);
12302 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
12303 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
12304 || sym->attr.allocatable))
12305 gfc_error ("Variable '%s' at %L with coarray component "
12306 "shall be a nonpointer, nonallocatable scalar",
12307 sym->name, &sym->declared_at);
12309 /* F2008, C526. The function-result case was handled above. */
12310 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12311 || sym->attr.codimension)
12312 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
12313 || sym->ns->proc_name->attr.flavor == FL_MODULE
12314 || sym->ns->proc_name->attr.is_main_program
12315 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
12316 gfc_error ("Variable '%s' at %L is a coarray or has a coarray "
12317 "component and is not ALLOCATABLE, SAVE nor a "
12318 "dummy argument", sym->name, &sym->declared_at);
12319 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
12320 else if (sym->attr.codimension && !sym->attr.allocatable
12321 && sym->as && sym->as->cotype == AS_DEFERRED)
12322 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
12323 "deferred shape", sym->name, &sym->declared_at);
12324 else if (sym->attr.codimension && sym->attr.allocatable
12325 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
12326 gfc_error ("Allocatable coarray variable '%s' at %L must have "
12327 "deferred shape", sym->name, &sym->declared_at);
12331 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12332 || (sym->attr.codimension && sym->attr.allocatable))
12333 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
12334 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
12335 "allocatable coarray or have coarray components",
12336 sym->name, &sym->declared_at);
12338 if (sym->attr.codimension && sym->attr.dummy
12339 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
12340 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
12341 "procedure '%s'", sym->name, &sym->declared_at,
12342 sym->ns->proc_name->name);
12344 switch (sym->attr.flavor)
12347 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
12352 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
12357 if (resolve_fl_namelist (sym) == FAILURE)
12362 if (resolve_fl_parameter (sym) == FAILURE)
12370 /* Resolve array specifier. Check as well some constraints
12371 on COMMON blocks. */
12373 check_constant = sym->attr.in_common && !sym->attr.pointer;
12375 /* Set the formal_arg_flag so that check_conflict will not throw
12376 an error for host associated variables in the specification
12377 expression for an array_valued function. */
12378 if (sym->attr.function && sym->as)
12379 formal_arg_flag = 1;
12381 gfc_resolve_array_spec (sym->as, check_constant);
12383 formal_arg_flag = 0;
12385 /* Resolve formal namespaces. */
12386 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
12387 && !sym->attr.contained && !sym->attr.intrinsic)
12388 gfc_resolve (sym->formal_ns);
12390 /* Make sure the formal namespace is present. */
12391 if (sym->formal && !sym->formal_ns)
12393 gfc_formal_arglist *formal = sym->formal;
12394 while (formal && !formal->sym)
12395 formal = formal->next;
12399 sym->formal_ns = formal->sym->ns;
12400 sym->formal_ns->refs++;
12404 /* Check threadprivate restrictions. */
12405 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
12406 && (!sym->attr.in_common
12407 && sym->module == NULL
12408 && (sym->ns->proc_name == NULL
12409 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
12410 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
12412 /* If we have come this far we can apply default-initializers, as
12413 described in 14.7.5, to those variables that have not already
12414 been assigned one. */
12415 if (sym->ts.type == BT_DERIVED
12416 && sym->ns == gfc_current_ns
12418 && !sym->attr.allocatable
12419 && !sym->attr.alloc_comp)
12421 symbol_attribute *a = &sym->attr;
12423 if ((!a->save && !a->dummy && !a->pointer
12424 && !a->in_common && !a->use_assoc
12425 && (a->referenced || a->result)
12426 && !(a->function && sym != sym->result))
12427 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
12428 apply_default_init (sym);
12431 if (sym->ts.type == BT_CLASS && sym->ns == gfc_current_ns
12432 && sym->attr.dummy && sym->attr.intent == INTENT_OUT
12433 && !CLASS_DATA (sym)->attr.class_pointer
12434 && !CLASS_DATA (sym)->attr.allocatable)
12435 apply_default_init (sym);
12437 /* If this symbol has a type-spec, check it. */
12438 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
12439 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
12440 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
12446 /************* Resolve DATA statements *************/
12450 gfc_data_value *vnode;
12456 /* Advance the values structure to point to the next value in the data list. */
12459 next_data_value (void)
12461 while (mpz_cmp_ui (values.left, 0) == 0)
12464 if (values.vnode->next == NULL)
12467 values.vnode = values.vnode->next;
12468 mpz_set (values.left, values.vnode->repeat);
12476 check_data_variable (gfc_data_variable *var, locus *where)
12482 ar_type mark = AR_UNKNOWN;
12484 mpz_t section_index[GFC_MAX_DIMENSIONS];
12490 if (gfc_resolve_expr (var->expr) == FAILURE)
12494 mpz_init_set_si (offset, 0);
12497 if (e->expr_type != EXPR_VARIABLE)
12498 gfc_internal_error ("check_data_variable(): Bad expression");
12500 sym = e->symtree->n.sym;
12502 if (sym->ns->is_block_data && !sym->attr.in_common)
12504 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
12505 sym->name, &sym->declared_at);
12508 if (e->ref == NULL && sym->as)
12510 gfc_error ("DATA array '%s' at %L must be specified in a previous"
12511 " declaration", sym->name, where);
12515 has_pointer = sym->attr.pointer;
12517 if (gfc_is_coindexed (e))
12519 gfc_error ("DATA element '%s' at %L cannot have a coindex", sym->name,
12524 for (ref = e->ref; ref; ref = ref->next)
12526 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
12530 && ref->type == REF_ARRAY
12531 && ref->u.ar.type != AR_FULL)
12533 gfc_error ("DATA element '%s' at %L is a pointer and so must "
12534 "be a full array", sym->name, where);
12539 if (e->rank == 0 || has_pointer)
12541 mpz_init_set_ui (size, 1);
12548 /* Find the array section reference. */
12549 for (ref = e->ref; ref; ref = ref->next)
12551 if (ref->type != REF_ARRAY)
12553 if (ref->u.ar.type == AR_ELEMENT)
12559 /* Set marks according to the reference pattern. */
12560 switch (ref->u.ar.type)
12568 /* Get the start position of array section. */
12569 gfc_get_section_index (ar, section_index, &offset);
12574 gcc_unreachable ();
12577 if (gfc_array_size (e, &size) == FAILURE)
12579 gfc_error ("Nonconstant array section at %L in DATA statement",
12581 mpz_clear (offset);
12588 while (mpz_cmp_ui (size, 0) > 0)
12590 if (next_data_value () == FAILURE)
12592 gfc_error ("DATA statement at %L has more variables than values",
12598 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
12602 /* If we have more than one element left in the repeat count,
12603 and we have more than one element left in the target variable,
12604 then create a range assignment. */
12605 /* FIXME: Only done for full arrays for now, since array sections
12607 if (mark == AR_FULL && ref && ref->next == NULL
12608 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
12612 if (mpz_cmp (size, values.left) >= 0)
12614 mpz_init_set (range, values.left);
12615 mpz_sub (size, size, values.left);
12616 mpz_set_ui (values.left, 0);
12620 mpz_init_set (range, size);
12621 mpz_sub (values.left, values.left, size);
12622 mpz_set_ui (size, 0);
12625 t = gfc_assign_data_value_range (var->expr, values.vnode->expr,
12628 mpz_add (offset, offset, range);
12635 /* Assign initial value to symbol. */
12638 mpz_sub_ui (values.left, values.left, 1);
12639 mpz_sub_ui (size, size, 1);
12641 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
12645 if (mark == AR_FULL)
12646 mpz_add_ui (offset, offset, 1);
12648 /* Modify the array section indexes and recalculate the offset
12649 for next element. */
12650 else if (mark == AR_SECTION)
12651 gfc_advance_section (section_index, ar, &offset);
12655 if (mark == AR_SECTION)
12657 for (i = 0; i < ar->dimen; i++)
12658 mpz_clear (section_index[i]);
12662 mpz_clear (offset);
12668 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
12670 /* Iterate over a list of elements in a DATA statement. */
12673 traverse_data_list (gfc_data_variable *var, locus *where)
12676 iterator_stack frame;
12677 gfc_expr *e, *start, *end, *step;
12678 gfc_try retval = SUCCESS;
12680 mpz_init (frame.value);
12683 start = gfc_copy_expr (var->iter.start);
12684 end = gfc_copy_expr (var->iter.end);
12685 step = gfc_copy_expr (var->iter.step);
12687 if (gfc_simplify_expr (start, 1) == FAILURE
12688 || start->expr_type != EXPR_CONSTANT)
12690 gfc_error ("start of implied-do loop at %L could not be "
12691 "simplified to a constant value", &start->where);
12695 if (gfc_simplify_expr (end, 1) == FAILURE
12696 || end->expr_type != EXPR_CONSTANT)
12698 gfc_error ("end of implied-do loop at %L could not be "
12699 "simplified to a constant value", &start->where);
12703 if (gfc_simplify_expr (step, 1) == FAILURE
12704 || step->expr_type != EXPR_CONSTANT)
12706 gfc_error ("step of implied-do loop at %L could not be "
12707 "simplified to a constant value", &start->where);
12712 mpz_set (trip, end->value.integer);
12713 mpz_sub (trip, trip, start->value.integer);
12714 mpz_add (trip, trip, step->value.integer);
12716 mpz_div (trip, trip, step->value.integer);
12718 mpz_set (frame.value, start->value.integer);
12720 frame.prev = iter_stack;
12721 frame.variable = var->iter.var->symtree;
12722 iter_stack = &frame;
12724 while (mpz_cmp_ui (trip, 0) > 0)
12726 if (traverse_data_var (var->list, where) == FAILURE)
12732 e = gfc_copy_expr (var->expr);
12733 if (gfc_simplify_expr (e, 1) == FAILURE)
12740 mpz_add (frame.value, frame.value, step->value.integer);
12742 mpz_sub_ui (trip, trip, 1);
12746 mpz_clear (frame.value);
12749 gfc_free_expr (start);
12750 gfc_free_expr (end);
12751 gfc_free_expr (step);
12753 iter_stack = frame.prev;
12758 /* Type resolve variables in the variable list of a DATA statement. */
12761 traverse_data_var (gfc_data_variable *var, locus *where)
12765 for (; var; var = var->next)
12767 if (var->expr == NULL)
12768 t = traverse_data_list (var, where);
12770 t = check_data_variable (var, where);
12780 /* Resolve the expressions and iterators associated with a data statement.
12781 This is separate from the assignment checking because data lists should
12782 only be resolved once. */
12785 resolve_data_variables (gfc_data_variable *d)
12787 for (; d; d = d->next)
12789 if (d->list == NULL)
12791 if (gfc_resolve_expr (d->expr) == FAILURE)
12796 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12799 if (resolve_data_variables (d->list) == FAILURE)
12808 /* Resolve a single DATA statement. We implement this by storing a pointer to
12809 the value list into static variables, and then recursively traversing the
12810 variables list, expanding iterators and such. */
12813 resolve_data (gfc_data *d)
12816 if (resolve_data_variables (d->var) == FAILURE)
12819 values.vnode = d->value;
12820 if (d->value == NULL)
12821 mpz_set_ui (values.left, 0);
12823 mpz_set (values.left, d->value->repeat);
12825 if (traverse_data_var (d->var, &d->where) == FAILURE)
12828 /* At this point, we better not have any values left. */
12830 if (next_data_value () == SUCCESS)
12831 gfc_error ("DATA statement at %L has more values than variables",
12836 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12837 accessed by host or use association, is a dummy argument to a pure function,
12838 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12839 is storage associated with any such variable, shall not be used in the
12840 following contexts: (clients of this function). */
12842 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12843 procedure. Returns zero if assignment is OK, nonzero if there is a
12846 gfc_impure_variable (gfc_symbol *sym)
12851 if (sym->attr.use_assoc || sym->attr.in_common)
12854 /* Check if the symbol's ns is inside the pure procedure. */
12855 for (ns = gfc_current_ns; ns; ns = ns->parent)
12859 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12863 proc = sym->ns->proc_name;
12864 if (sym->attr.dummy && gfc_pure (proc)
12865 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12867 proc->attr.function))
12870 /* TODO: Sort out what can be storage associated, if anything, and include
12871 it here. In principle equivalences should be scanned but it does not
12872 seem to be possible to storage associate an impure variable this way. */
12877 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12878 current namespace is inside a pure procedure. */
12881 gfc_pure (gfc_symbol *sym)
12883 symbol_attribute attr;
12888 /* Check if the current namespace or one of its parents
12889 belongs to a pure procedure. */
12890 for (ns = gfc_current_ns; ns; ns = ns->parent)
12892 sym = ns->proc_name;
12896 if (attr.flavor == FL_PROCEDURE && attr.pure)
12904 return attr.flavor == FL_PROCEDURE && attr.pure;
12908 /* Test whether a symbol is implicitly pure or not. For a NULL pointer,
12909 checks if the current namespace is implicitly pure. Note that this
12910 function returns false for a PURE procedure. */
12913 gfc_implicit_pure (gfc_symbol *sym)
12915 symbol_attribute attr;
12919 /* Check if the current namespace is implicit_pure. */
12920 sym = gfc_current_ns->proc_name;
12924 if (attr.flavor == FL_PROCEDURE
12925 && attr.implicit_pure && !attr.pure)
12932 return attr.flavor == FL_PROCEDURE && attr.implicit_pure && !attr.pure;
12936 /* Test whether the current procedure is elemental or not. */
12939 gfc_elemental (gfc_symbol *sym)
12941 symbol_attribute attr;
12944 sym = gfc_current_ns->proc_name;
12949 return attr.flavor == FL_PROCEDURE && attr.elemental;
12953 /* Warn about unused labels. */
12956 warn_unused_fortran_label (gfc_st_label *label)
12961 warn_unused_fortran_label (label->left);
12963 if (label->defined == ST_LABEL_UNKNOWN)
12966 switch (label->referenced)
12968 case ST_LABEL_UNKNOWN:
12969 gfc_warning ("Label %d at %L defined but not used", label->value,
12973 case ST_LABEL_BAD_TARGET:
12974 gfc_warning ("Label %d at %L defined but cannot be used",
12975 label->value, &label->where);
12982 warn_unused_fortran_label (label->right);
12986 /* Returns the sequence type of a symbol or sequence. */
12989 sequence_type (gfc_typespec ts)
12998 if (ts.u.derived->components == NULL)
12999 return SEQ_NONDEFAULT;
13001 result = sequence_type (ts.u.derived->components->ts);
13002 for (c = ts.u.derived->components->next; c; c = c->next)
13003 if (sequence_type (c->ts) != result)
13009 if (ts.kind != gfc_default_character_kind)
13010 return SEQ_NONDEFAULT;
13012 return SEQ_CHARACTER;
13015 if (ts.kind != gfc_default_integer_kind)
13016 return SEQ_NONDEFAULT;
13018 return SEQ_NUMERIC;
13021 if (!(ts.kind == gfc_default_real_kind
13022 || ts.kind == gfc_default_double_kind))
13023 return SEQ_NONDEFAULT;
13025 return SEQ_NUMERIC;
13028 if (ts.kind != gfc_default_complex_kind)
13029 return SEQ_NONDEFAULT;
13031 return SEQ_NUMERIC;
13034 if (ts.kind != gfc_default_logical_kind)
13035 return SEQ_NONDEFAULT;
13037 return SEQ_NUMERIC;
13040 return SEQ_NONDEFAULT;
13045 /* Resolve derived type EQUIVALENCE object. */
13048 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
13050 gfc_component *c = derived->components;
13055 /* Shall not be an object of nonsequence derived type. */
13056 if (!derived->attr.sequence)
13058 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
13059 "attribute to be an EQUIVALENCE object", sym->name,
13064 /* Shall not have allocatable components. */
13065 if (derived->attr.alloc_comp)
13067 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
13068 "components to be an EQUIVALENCE object",sym->name,
13073 if (sym->attr.in_common && gfc_has_default_initializer (sym->ts.u.derived))
13075 gfc_error ("Derived type variable '%s' at %L with default "
13076 "initialization cannot be in EQUIVALENCE with a variable "
13077 "in COMMON", sym->name, &e->where);
13081 for (; c ; c = c->next)
13083 if (c->ts.type == BT_DERIVED
13084 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
13087 /* Shall not be an object of sequence derived type containing a pointer
13088 in the structure. */
13089 if (c->attr.pointer)
13091 gfc_error ("Derived type variable '%s' at %L with pointer "
13092 "component(s) cannot be an EQUIVALENCE object",
13093 sym->name, &e->where);
13101 /* Resolve equivalence object.
13102 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
13103 an allocatable array, an object of nonsequence derived type, an object of
13104 sequence derived type containing a pointer at any level of component
13105 selection, an automatic object, a function name, an entry name, a result
13106 name, a named constant, a structure component, or a subobject of any of
13107 the preceding objects. A substring shall not have length zero. A
13108 derived type shall not have components with default initialization nor
13109 shall two objects of an equivalence group be initialized.
13110 Either all or none of the objects shall have an protected attribute.
13111 The simple constraints are done in symbol.c(check_conflict) and the rest
13112 are implemented here. */
13115 resolve_equivalence (gfc_equiv *eq)
13118 gfc_symbol *first_sym;
13121 locus *last_where = NULL;
13122 seq_type eq_type, last_eq_type;
13123 gfc_typespec *last_ts;
13124 int object, cnt_protected;
13127 last_ts = &eq->expr->symtree->n.sym->ts;
13129 first_sym = eq->expr->symtree->n.sym;
13133 for (object = 1; eq; eq = eq->eq, object++)
13137 e->ts = e->symtree->n.sym->ts;
13138 /* match_varspec might not know yet if it is seeing
13139 array reference or substring reference, as it doesn't
13141 if (e->ref && e->ref->type == REF_ARRAY)
13143 gfc_ref *ref = e->ref;
13144 sym = e->symtree->n.sym;
13146 if (sym->attr.dimension)
13148 ref->u.ar.as = sym->as;
13152 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
13153 if (e->ts.type == BT_CHARACTER
13155 && ref->type == REF_ARRAY
13156 && ref->u.ar.dimen == 1
13157 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
13158 && ref->u.ar.stride[0] == NULL)
13160 gfc_expr *start = ref->u.ar.start[0];
13161 gfc_expr *end = ref->u.ar.end[0];
13164 /* Optimize away the (:) reference. */
13165 if (start == NULL && end == NULL)
13168 e->ref = ref->next;
13170 e->ref->next = ref->next;
13175 ref->type = REF_SUBSTRING;
13177 start = gfc_get_int_expr (gfc_default_integer_kind,
13179 ref->u.ss.start = start;
13180 if (end == NULL && e->ts.u.cl)
13181 end = gfc_copy_expr (e->ts.u.cl->length);
13182 ref->u.ss.end = end;
13183 ref->u.ss.length = e->ts.u.cl;
13190 /* Any further ref is an error. */
13193 gcc_assert (ref->type == REF_ARRAY);
13194 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
13200 if (gfc_resolve_expr (e) == FAILURE)
13203 sym = e->symtree->n.sym;
13205 if (sym->attr.is_protected)
13207 if (cnt_protected > 0 && cnt_protected != object)
13209 gfc_error ("Either all or none of the objects in the "
13210 "EQUIVALENCE set at %L shall have the "
13211 "PROTECTED attribute",
13216 /* Shall not equivalence common block variables in a PURE procedure. */
13217 if (sym->ns->proc_name
13218 && sym->ns->proc_name->attr.pure
13219 && sym->attr.in_common)
13221 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
13222 "object in the pure procedure '%s'",
13223 sym->name, &e->where, sym->ns->proc_name->name);
13227 /* Shall not be a named constant. */
13228 if (e->expr_type == EXPR_CONSTANT)
13230 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
13231 "object", sym->name, &e->where);
13235 if (e->ts.type == BT_DERIVED
13236 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
13239 /* Check that the types correspond correctly:
13241 A numeric sequence structure may be equivalenced to another sequence
13242 structure, an object of default integer type, default real type, double
13243 precision real type, default logical type such that components of the
13244 structure ultimately only become associated to objects of the same
13245 kind. A character sequence structure may be equivalenced to an object
13246 of default character kind or another character sequence structure.
13247 Other objects may be equivalenced only to objects of the same type and
13248 kind parameters. */
13250 /* Identical types are unconditionally OK. */
13251 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
13252 goto identical_types;
13254 last_eq_type = sequence_type (*last_ts);
13255 eq_type = sequence_type (sym->ts);
13257 /* Since the pair of objects is not of the same type, mixed or
13258 non-default sequences can be rejected. */
13260 msg = "Sequence %s with mixed components in EQUIVALENCE "
13261 "statement at %L with different type objects";
13263 && last_eq_type == SEQ_MIXED
13264 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
13266 || (eq_type == SEQ_MIXED
13267 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13268 &e->where) == FAILURE))
13271 msg = "Non-default type object or sequence %s in EQUIVALENCE "
13272 "statement at %L with objects of different type";
13274 && last_eq_type == SEQ_NONDEFAULT
13275 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
13276 last_where) == FAILURE)
13277 || (eq_type == SEQ_NONDEFAULT
13278 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13279 &e->where) == FAILURE))
13282 msg ="Non-CHARACTER object '%s' in default CHARACTER "
13283 "EQUIVALENCE statement at %L";
13284 if (last_eq_type == SEQ_CHARACTER
13285 && eq_type != SEQ_CHARACTER
13286 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13287 &e->where) == FAILURE)
13290 msg ="Non-NUMERIC object '%s' in default NUMERIC "
13291 "EQUIVALENCE statement at %L";
13292 if (last_eq_type == SEQ_NUMERIC
13293 && eq_type != SEQ_NUMERIC
13294 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13295 &e->where) == FAILURE)
13300 last_where = &e->where;
13305 /* Shall not be an automatic array. */
13306 if (e->ref->type == REF_ARRAY
13307 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
13309 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
13310 "an EQUIVALENCE object", sym->name, &e->where);
13317 /* Shall not be a structure component. */
13318 if (r->type == REF_COMPONENT)
13320 gfc_error ("Structure component '%s' at %L cannot be an "
13321 "EQUIVALENCE object",
13322 r->u.c.component->name, &e->where);
13326 /* A substring shall not have length zero. */
13327 if (r->type == REF_SUBSTRING)
13329 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
13331 gfc_error ("Substring at %L has length zero",
13332 &r->u.ss.start->where);
13342 /* Resolve function and ENTRY types, issue diagnostics if needed. */
13345 resolve_fntype (gfc_namespace *ns)
13347 gfc_entry_list *el;
13350 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
13353 /* If there are any entries, ns->proc_name is the entry master
13354 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
13356 sym = ns->entries->sym;
13358 sym = ns->proc_name;
13359 if (sym->result == sym
13360 && sym->ts.type == BT_UNKNOWN
13361 && gfc_set_default_type (sym, 0, NULL) == FAILURE
13362 && !sym->attr.untyped)
13364 gfc_error ("Function '%s' at %L has no IMPLICIT type",
13365 sym->name, &sym->declared_at);
13366 sym->attr.untyped = 1;
13369 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
13370 && !sym->attr.contained
13371 && !gfc_check_symbol_access (sym->ts.u.derived)
13372 && gfc_check_symbol_access (sym))
13374 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
13375 "%L of PRIVATE type '%s'", sym->name,
13376 &sym->declared_at, sym->ts.u.derived->name);
13380 for (el = ns->entries->next; el; el = el->next)
13382 if (el->sym->result == el->sym
13383 && el->sym->ts.type == BT_UNKNOWN
13384 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
13385 && !el->sym->attr.untyped)
13387 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
13388 el->sym->name, &el->sym->declared_at);
13389 el->sym->attr.untyped = 1;
13395 /* 12.3.2.1.1 Defined operators. */
13398 check_uop_procedure (gfc_symbol *sym, locus where)
13400 gfc_formal_arglist *formal;
13402 if (!sym->attr.function)
13404 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
13405 sym->name, &where);
13409 if (sym->ts.type == BT_CHARACTER
13410 && !(sym->ts.u.cl && sym->ts.u.cl->length)
13411 && !(sym->result && sym->result->ts.u.cl
13412 && sym->result->ts.u.cl->length))
13414 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
13415 "character length", sym->name, &where);
13419 formal = sym->formal;
13420 if (!formal || !formal->sym)
13422 gfc_error ("User operator procedure '%s' at %L must have at least "
13423 "one argument", sym->name, &where);
13427 if (formal->sym->attr.intent != INTENT_IN)
13429 gfc_error ("First argument of operator interface at %L must be "
13430 "INTENT(IN)", &where);
13434 if (formal->sym->attr.optional)
13436 gfc_error ("First argument of operator interface at %L cannot be "
13437 "optional", &where);
13441 formal = formal->next;
13442 if (!formal || !formal->sym)
13445 if (formal->sym->attr.intent != INTENT_IN)
13447 gfc_error ("Second argument of operator interface at %L must be "
13448 "INTENT(IN)", &where);
13452 if (formal->sym->attr.optional)
13454 gfc_error ("Second argument of operator interface at %L cannot be "
13455 "optional", &where);
13461 gfc_error ("Operator interface at %L must have, at most, two "
13462 "arguments", &where);
13470 gfc_resolve_uops (gfc_symtree *symtree)
13472 gfc_interface *itr;
13474 if (symtree == NULL)
13477 gfc_resolve_uops (symtree->left);
13478 gfc_resolve_uops (symtree->right);
13480 for (itr = symtree->n.uop->op; itr; itr = itr->next)
13481 check_uop_procedure (itr->sym, itr->sym->declared_at);
13485 /* Examine all of the expressions associated with a program unit,
13486 assign types to all intermediate expressions, make sure that all
13487 assignments are to compatible types and figure out which names
13488 refer to which functions or subroutines. It doesn't check code
13489 block, which is handled by resolve_code. */
13492 resolve_types (gfc_namespace *ns)
13498 gfc_namespace* old_ns = gfc_current_ns;
13500 /* Check that all IMPLICIT types are ok. */
13501 if (!ns->seen_implicit_none)
13504 for (letter = 0; letter != GFC_LETTERS; ++letter)
13505 if (ns->set_flag[letter]
13506 && resolve_typespec_used (&ns->default_type[letter],
13507 &ns->implicit_loc[letter],
13512 gfc_current_ns = ns;
13514 resolve_entries (ns);
13516 resolve_common_vars (ns->blank_common.head, false);
13517 resolve_common_blocks (ns->common_root);
13519 resolve_contained_functions (ns);
13521 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
13523 for (cl = ns->cl_list; cl; cl = cl->next)
13524 resolve_charlen (cl);
13526 gfc_traverse_ns (ns, resolve_symbol);
13528 resolve_fntype (ns);
13530 for (n = ns->contained; n; n = n->sibling)
13532 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
13533 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
13534 "also be PURE", n->proc_name->name,
13535 &n->proc_name->declared_at);
13541 gfc_check_interfaces (ns);
13543 gfc_traverse_ns (ns, resolve_values);
13549 for (d = ns->data; d; d = d->next)
13553 gfc_traverse_ns (ns, gfc_formalize_init_value);
13555 gfc_traverse_ns (ns, gfc_verify_binding_labels);
13557 if (ns->common_root != NULL)
13558 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
13560 for (eq = ns->equiv; eq; eq = eq->next)
13561 resolve_equivalence (eq);
13563 /* Warn about unused labels. */
13564 if (warn_unused_label)
13565 warn_unused_fortran_label (ns->st_labels);
13567 gfc_resolve_uops (ns->uop_root);
13569 gfc_current_ns = old_ns;
13573 /* Call resolve_code recursively. */
13576 resolve_codes (gfc_namespace *ns)
13579 bitmap_obstack old_obstack;
13581 if (ns->resolved == 1)
13584 for (n = ns->contained; n; n = n->sibling)
13587 gfc_current_ns = ns;
13589 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
13590 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
13593 /* Set to an out of range value. */
13594 current_entry_id = -1;
13596 old_obstack = labels_obstack;
13597 bitmap_obstack_initialize (&labels_obstack);
13599 resolve_code (ns->code, ns);
13601 bitmap_obstack_release (&labels_obstack);
13602 labels_obstack = old_obstack;
13606 /* This function is called after a complete program unit has been compiled.
13607 Its purpose is to examine all of the expressions associated with a program
13608 unit, assign types to all intermediate expressions, make sure that all
13609 assignments are to compatible types and figure out which names refer to
13610 which functions or subroutines. */
13613 gfc_resolve (gfc_namespace *ns)
13615 gfc_namespace *old_ns;
13616 code_stack *old_cs_base;
13622 old_ns = gfc_current_ns;
13623 old_cs_base = cs_base;
13625 resolve_types (ns);
13626 resolve_codes (ns);
13628 gfc_current_ns = old_ns;
13629 cs_base = old_cs_base;
13632 gfc_run_passes (ns);