1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
28 #include "arith.h" /* For gfc_compare_expr(). */
29 #include "dependency.h"
31 #include "target-memory.h" /* for gfc_simplify_transfer */
32 #include "constructor.h"
34 /* Types used in equivalence statements. */
38 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
42 /* Stack to keep track of the nesting of blocks as we move through the
43 code. See resolve_branch() and resolve_code(). */
45 typedef struct code_stack
47 struct gfc_code *head, *current;
48 struct code_stack *prev;
50 /* This bitmap keeps track of the targets valid for a branch from
51 inside this block except for END {IF|SELECT}s of enclosing
53 bitmap reachable_labels;
57 static code_stack *cs_base = NULL;
60 /* Nonzero if we're inside a FORALL block. */
62 static int forall_flag;
64 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
66 static int omp_workshare_flag;
68 /* Nonzero if we are processing a formal arglist. The corresponding function
69 resets the flag each time that it is read. */
70 static int formal_arg_flag = 0;
72 /* True if we are resolving a specification expression. */
73 static int specification_expr = 0;
75 /* The id of the last entry seen. */
76 static int current_entry_id;
78 /* We use bitmaps to determine if a branch target is valid. */
79 static bitmap_obstack labels_obstack;
81 /* True when simplifying a EXPR_VARIABLE argument to an inquiry function. */
82 static bool inquiry_argument = false;
85 gfc_is_formal_arg (void)
87 return formal_arg_flag;
90 /* Is the symbol host associated? */
92 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
94 for (ns = ns->parent; ns; ns = ns->parent)
103 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
104 an ABSTRACT derived-type. If where is not NULL, an error message with that
105 locus is printed, optionally using name. */
108 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
110 if (ts->type == BT_DERIVED && ts->u.derived->attr.abstract)
115 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
116 name, where, ts->u.derived->name);
118 gfc_error ("ABSTRACT type '%s' used at %L",
119 ts->u.derived->name, where);
129 /* Resolve types of formal argument lists. These have to be done early so that
130 the formal argument lists of module procedures can be copied to the
131 containing module before the individual procedures are resolved
132 individually. We also resolve argument lists of procedures in interface
133 blocks because they are self-contained scoping units.
135 Since a dummy argument cannot be a non-dummy procedure, the only
136 resort left for untyped names are the IMPLICIT types. */
139 resolve_formal_arglist (gfc_symbol *proc)
141 gfc_formal_arglist *f;
145 if (proc->result != NULL)
150 if (gfc_elemental (proc)
151 || sym->attr.pointer || sym->attr.allocatable
152 || (sym->as && sym->as->rank > 0))
154 proc->attr.always_explicit = 1;
155 sym->attr.always_explicit = 1;
160 for (f = proc->formal; f; f = f->next)
166 /* Alternate return placeholder. */
167 if (gfc_elemental (proc))
168 gfc_error ("Alternate return specifier in elemental subroutine "
169 "'%s' at %L is not allowed", proc->name,
171 if (proc->attr.function)
172 gfc_error ("Alternate return specifier in function "
173 "'%s' at %L is not allowed", proc->name,
178 if (sym->attr.if_source != IFSRC_UNKNOWN)
179 resolve_formal_arglist (sym);
181 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
183 if (gfc_pure (proc) && !gfc_pure (sym))
185 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
186 "also be PURE", sym->name, &sym->declared_at);
190 if (gfc_elemental (proc))
192 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
193 "procedure", &sym->declared_at);
197 if (sym->attr.function
198 && sym->ts.type == BT_UNKNOWN
199 && sym->attr.intrinsic)
201 gfc_intrinsic_sym *isym;
202 isym = gfc_find_function (sym->name);
203 if (isym == NULL || !isym->specific)
205 gfc_error ("Unable to find a specific INTRINSIC procedure "
206 "for the reference '%s' at %L", sym->name,
215 if (sym->ts.type == BT_UNKNOWN)
217 if (!sym->attr.function || sym->result == sym)
218 gfc_set_default_type (sym, 1, sym->ns);
221 gfc_resolve_array_spec (sym->as, 0);
223 /* We can't tell if an array with dimension (:) is assumed or deferred
224 shape until we know if it has the pointer or allocatable attributes.
226 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
227 && !(sym->attr.pointer || sym->attr.allocatable))
229 sym->as->type = AS_ASSUMED_SHAPE;
230 for (i = 0; i < sym->as->rank; i++)
231 sym->as->lower[i] = gfc_get_int_expr (gfc_default_integer_kind,
235 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
236 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
237 || sym->attr.optional)
239 proc->attr.always_explicit = 1;
241 proc->result->attr.always_explicit = 1;
244 /* If the flavor is unknown at this point, it has to be a variable.
245 A procedure specification would have already set the type. */
247 if (sym->attr.flavor == FL_UNKNOWN)
248 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
250 if (gfc_pure (proc) && !sym->attr.pointer
251 && sym->attr.flavor != FL_PROCEDURE)
253 if (proc->attr.function && sym->attr.intent != INTENT_IN)
254 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
255 "INTENT(IN)", sym->name, proc->name,
258 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
259 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
260 "have its INTENT specified", sym->name, proc->name,
264 if (gfc_elemental (proc))
267 if (sym->attr.codimension)
269 gfc_error ("Coarray dummy argument '%s' at %L to elemental "
270 "procedure", sym->name, &sym->declared_at);
276 gfc_error ("Argument '%s' of elemental procedure at %L must "
277 "be scalar", sym->name, &sym->declared_at);
281 if (sym->attr.pointer)
283 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
284 "have the POINTER attribute", sym->name,
289 if (sym->attr.flavor == FL_PROCEDURE)
291 gfc_error ("Dummy procedure '%s' not allowed in elemental "
292 "procedure '%s' at %L", sym->name, proc->name,
298 /* Each dummy shall be specified to be scalar. */
299 if (proc->attr.proc == PROC_ST_FUNCTION)
303 gfc_error ("Argument '%s' of statement function at %L must "
304 "be scalar", sym->name, &sym->declared_at);
308 if (sym->ts.type == BT_CHARACTER)
310 gfc_charlen *cl = sym->ts.u.cl;
311 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
313 gfc_error ("Character-valued argument '%s' of statement "
314 "function at %L must have constant length",
315 sym->name, &sym->declared_at);
325 /* Work function called when searching for symbols that have argument lists
326 associated with them. */
329 find_arglists (gfc_symbol *sym)
331 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
334 resolve_formal_arglist (sym);
338 /* Given a namespace, resolve all formal argument lists within the namespace.
342 resolve_formal_arglists (gfc_namespace *ns)
347 gfc_traverse_ns (ns, find_arglists);
352 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
356 /* If this namespace is not a function or an entry master function,
358 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
359 || sym->attr.entry_master)
362 /* Try to find out of what the return type is. */
363 if (sym->result->ts.type == BT_UNKNOWN && sym->result->ts.interface == NULL)
365 t = gfc_set_default_type (sym->result, 0, ns);
367 if (t == FAILURE && !sym->result->attr.untyped)
369 if (sym->result == sym)
370 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
371 sym->name, &sym->declared_at);
372 else if (!sym->result->attr.proc_pointer)
373 gfc_error ("Result '%s' of contained function '%s' at %L has "
374 "no IMPLICIT type", sym->result->name, sym->name,
375 &sym->result->declared_at);
376 sym->result->attr.untyped = 1;
380 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
381 type, lists the only ways a character length value of * can be used:
382 dummy arguments of procedures, named constants, and function results
383 in external functions. Internal function results and results of module
384 procedures are not on this list, ergo, not permitted. */
386 if (sym->result->ts.type == BT_CHARACTER)
388 gfc_charlen *cl = sym->result->ts.u.cl;
389 if (!cl || !cl->length)
391 /* See if this is a module-procedure and adapt error message
394 gcc_assert (ns->parent && ns->parent->proc_name);
395 module_proc = (ns->parent->proc_name->attr.flavor == FL_MODULE);
397 gfc_error ("Character-valued %s '%s' at %L must not be"
399 module_proc ? _("module procedure")
400 : _("internal function"),
401 sym->name, &sym->declared_at);
407 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
408 introduce duplicates. */
411 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
413 gfc_formal_arglist *f, *new_arglist;
416 for (; new_args != NULL; new_args = new_args->next)
418 new_sym = new_args->sym;
419 /* See if this arg is already in the formal argument list. */
420 for (f = proc->formal; f; f = f->next)
422 if (new_sym == f->sym)
429 /* Add a new argument. Argument order is not important. */
430 new_arglist = gfc_get_formal_arglist ();
431 new_arglist->sym = new_sym;
432 new_arglist->next = proc->formal;
433 proc->formal = new_arglist;
438 /* Flag the arguments that are not present in all entries. */
441 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
443 gfc_formal_arglist *f, *head;
446 for (f = proc->formal; f; f = f->next)
451 for (new_args = head; new_args; new_args = new_args->next)
453 if (new_args->sym == f->sym)
460 f->sym->attr.not_always_present = 1;
465 /* Resolve alternate entry points. If a symbol has multiple entry points we
466 create a new master symbol for the main routine, and turn the existing
467 symbol into an entry point. */
470 resolve_entries (gfc_namespace *ns)
472 gfc_namespace *old_ns;
476 char name[GFC_MAX_SYMBOL_LEN + 1];
477 static int master_count = 0;
479 if (ns->proc_name == NULL)
482 /* No need to do anything if this procedure doesn't have alternate entry
487 /* We may already have resolved alternate entry points. */
488 if (ns->proc_name->attr.entry_master)
491 /* If this isn't a procedure something has gone horribly wrong. */
492 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
494 /* Remember the current namespace. */
495 old_ns = gfc_current_ns;
499 /* Add the main entry point to the list of entry points. */
500 el = gfc_get_entry_list ();
501 el->sym = ns->proc_name;
503 el->next = ns->entries;
505 ns->proc_name->attr.entry = 1;
507 /* If it is a module function, it needs to be in the right namespace
508 so that gfc_get_fake_result_decl can gather up the results. The
509 need for this arose in get_proc_name, where these beasts were
510 left in their own namespace, to keep prior references linked to
511 the entry declaration.*/
512 if (ns->proc_name->attr.function
513 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
516 /* Do the same for entries where the master is not a module
517 procedure. These are retained in the module namespace because
518 of the module procedure declaration. */
519 for (el = el->next; el; el = el->next)
520 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
521 && el->sym->attr.mod_proc)
525 /* Add an entry statement for it. */
532 /* Create a new symbol for the master function. */
533 /* Give the internal function a unique name (within this file).
534 Also include the function name so the user has some hope of figuring
535 out what is going on. */
536 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
537 master_count++, ns->proc_name->name);
538 gfc_get_ha_symbol (name, &proc);
539 gcc_assert (proc != NULL);
541 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
542 if (ns->proc_name->attr.subroutine)
543 gfc_add_subroutine (&proc->attr, proc->name, NULL);
547 gfc_typespec *ts, *fts;
548 gfc_array_spec *as, *fas;
549 gfc_add_function (&proc->attr, proc->name, NULL);
551 fas = ns->entries->sym->as;
552 fas = fas ? fas : ns->entries->sym->result->as;
553 fts = &ns->entries->sym->result->ts;
554 if (fts->type == BT_UNKNOWN)
555 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
556 for (el = ns->entries->next; el; el = el->next)
558 ts = &el->sym->result->ts;
560 as = as ? as : el->sym->result->as;
561 if (ts->type == BT_UNKNOWN)
562 ts = gfc_get_default_type (el->sym->result->name, NULL);
564 if (! gfc_compare_types (ts, fts)
565 || (el->sym->result->attr.dimension
566 != ns->entries->sym->result->attr.dimension)
567 || (el->sym->result->attr.pointer
568 != ns->entries->sym->result->attr.pointer))
570 else if (as && fas && ns->entries->sym->result != el->sym->result
571 && gfc_compare_array_spec (as, fas) == 0)
572 gfc_error ("Function %s at %L has entries with mismatched "
573 "array specifications", ns->entries->sym->name,
574 &ns->entries->sym->declared_at);
575 /* The characteristics need to match and thus both need to have
576 the same string length, i.e. both len=*, or both len=4.
577 Having both len=<variable> is also possible, but difficult to
578 check at compile time. */
579 else if (ts->type == BT_CHARACTER && ts->u.cl && fts->u.cl
580 && (((ts->u.cl->length && !fts->u.cl->length)
581 ||(!ts->u.cl->length && fts->u.cl->length))
583 && ts->u.cl->length->expr_type
584 != fts->u.cl->length->expr_type)
586 && ts->u.cl->length->expr_type == EXPR_CONSTANT
587 && mpz_cmp (ts->u.cl->length->value.integer,
588 fts->u.cl->length->value.integer) != 0)))
589 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
590 "entries returning variables of different "
591 "string lengths", ns->entries->sym->name,
592 &ns->entries->sym->declared_at);
597 sym = ns->entries->sym->result;
598 /* All result types the same. */
600 if (sym->attr.dimension)
601 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
602 if (sym->attr.pointer)
603 gfc_add_pointer (&proc->attr, NULL);
607 /* Otherwise the result will be passed through a union by
609 proc->attr.mixed_entry_master = 1;
610 for (el = ns->entries; el; el = el->next)
612 sym = el->sym->result;
613 if (sym->attr.dimension)
615 if (el == ns->entries)
616 gfc_error ("FUNCTION result %s can't be an array in "
617 "FUNCTION %s at %L", sym->name,
618 ns->entries->sym->name, &sym->declared_at);
620 gfc_error ("ENTRY result %s can't be an array in "
621 "FUNCTION %s at %L", sym->name,
622 ns->entries->sym->name, &sym->declared_at);
624 else if (sym->attr.pointer)
626 if (el == ns->entries)
627 gfc_error ("FUNCTION result %s can't be a POINTER in "
628 "FUNCTION %s at %L", sym->name,
629 ns->entries->sym->name, &sym->declared_at);
631 gfc_error ("ENTRY result %s can't be a POINTER in "
632 "FUNCTION %s at %L", sym->name,
633 ns->entries->sym->name, &sym->declared_at);
638 if (ts->type == BT_UNKNOWN)
639 ts = gfc_get_default_type (sym->name, NULL);
643 if (ts->kind == gfc_default_integer_kind)
647 if (ts->kind == gfc_default_real_kind
648 || ts->kind == gfc_default_double_kind)
652 if (ts->kind == gfc_default_complex_kind)
656 if (ts->kind == gfc_default_logical_kind)
660 /* We will issue error elsewhere. */
668 if (el == ns->entries)
669 gfc_error ("FUNCTION result %s can't be of type %s "
670 "in FUNCTION %s at %L", sym->name,
671 gfc_typename (ts), ns->entries->sym->name,
674 gfc_error ("ENTRY result %s can't be of type %s "
675 "in FUNCTION %s at %L", sym->name,
676 gfc_typename (ts), ns->entries->sym->name,
683 proc->attr.access = ACCESS_PRIVATE;
684 proc->attr.entry_master = 1;
686 /* Merge all the entry point arguments. */
687 for (el = ns->entries; el; el = el->next)
688 merge_argument_lists (proc, el->sym->formal);
690 /* Check the master formal arguments for any that are not
691 present in all entry points. */
692 for (el = ns->entries; el; el = el->next)
693 check_argument_lists (proc, el->sym->formal);
695 /* Use the master function for the function body. */
696 ns->proc_name = proc;
698 /* Finalize the new symbols. */
699 gfc_commit_symbols ();
701 /* Restore the original namespace. */
702 gfc_current_ns = old_ns;
707 has_default_initializer (gfc_symbol *der)
711 gcc_assert (der->attr.flavor == FL_DERIVED);
712 for (c = der->components; c; c = c->next)
713 if ((c->ts.type != BT_DERIVED && c->initializer)
714 || (c->ts.type == BT_DERIVED
715 && (!c->attr.pointer && has_default_initializer (c->ts.u.derived))))
721 /* Resolve common variables. */
723 resolve_common_vars (gfc_symbol *sym, bool named_common)
725 gfc_symbol *csym = sym;
727 for (; csym; csym = csym->common_next)
729 if (csym->value || csym->attr.data)
731 if (!csym->ns->is_block_data)
732 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
733 "but only in BLOCK DATA initialization is "
734 "allowed", csym->name, &csym->declared_at);
735 else if (!named_common)
736 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
737 "in a blank COMMON but initialization is only "
738 "allowed in named common blocks", csym->name,
742 if (csym->ts.type != BT_DERIVED)
745 if (!(csym->ts.u.derived->attr.sequence
746 || csym->ts.u.derived->attr.is_bind_c))
747 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
748 "has neither the SEQUENCE nor the BIND(C) "
749 "attribute", csym->name, &csym->declared_at);
750 if (csym->ts.u.derived->attr.alloc_comp)
751 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
752 "has an ultimate component that is "
753 "allocatable", csym->name, &csym->declared_at);
754 if (has_default_initializer (csym->ts.u.derived))
755 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
756 "may not have default initializer", csym->name,
759 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
760 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
764 /* Resolve common blocks. */
766 resolve_common_blocks (gfc_symtree *common_root)
770 if (common_root == NULL)
773 if (common_root->left)
774 resolve_common_blocks (common_root->left);
775 if (common_root->right)
776 resolve_common_blocks (common_root->right);
778 resolve_common_vars (common_root->n.common->head, true);
780 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
784 if (sym->attr.flavor == FL_PARAMETER)
785 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
786 sym->name, &common_root->n.common->where, &sym->declared_at);
788 if (sym->attr.intrinsic)
789 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
790 sym->name, &common_root->n.common->where);
791 else if (sym->attr.result
792 || gfc_is_function_return_value (sym, gfc_current_ns))
793 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
794 "that is also a function result", sym->name,
795 &common_root->n.common->where);
796 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
797 && sym->attr.proc != PROC_ST_FUNCTION)
798 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
799 "that is also a global procedure", sym->name,
800 &common_root->n.common->where);
804 /* Resolve contained function types. Because contained functions can call one
805 another, they have to be worked out before any of the contained procedures
808 The good news is that if a function doesn't already have a type, the only
809 way it can get one is through an IMPLICIT type or a RESULT variable, because
810 by definition contained functions are contained namespace they're contained
811 in, not in a sibling or parent namespace. */
814 resolve_contained_functions (gfc_namespace *ns)
816 gfc_namespace *child;
819 resolve_formal_arglists (ns);
821 for (child = ns->contained; child; child = child->sibling)
823 /* Resolve alternate entry points first. */
824 resolve_entries (child);
826 /* Then check function return types. */
827 resolve_contained_fntype (child->proc_name, child);
828 for (el = child->entries; el; el = el->next)
829 resolve_contained_fntype (el->sym, child);
834 /* Resolve all of the elements of a structure constructor and make sure that
835 the types are correct. */
838 resolve_structure_cons (gfc_expr *expr)
840 gfc_constructor *cons;
846 cons = gfc_constructor_first (expr->value.constructor);
847 /* A constructor may have references if it is the result of substituting a
848 parameter variable. In this case we just pull out the component we
851 comp = expr->ref->u.c.sym->components;
853 comp = expr->ts.u.derived->components;
855 /* See if the user is trying to invoke a structure constructor for one of
856 the iso_c_binding derived types. */
857 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
858 && expr->ts.u.derived->ts.is_iso_c && cons
859 && (cons->expr == NULL || cons->expr->expr_type != EXPR_NULL))
861 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
862 expr->ts.u.derived->name, &(expr->where));
866 /* Return if structure constructor is c_null_(fun)prt. */
867 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
868 && expr->ts.u.derived->ts.is_iso_c && cons
869 && cons->expr && cons->expr->expr_type == EXPR_NULL)
872 for (; comp && cons; comp = comp->next, cons = gfc_constructor_next (cons))
879 if (gfc_resolve_expr (cons->expr) == FAILURE)
885 rank = comp->as ? comp->as->rank : 0;
886 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
887 && (comp->attr.allocatable || cons->expr->rank))
889 gfc_error ("The rank of the element in the derived type "
890 "constructor at %L does not match that of the "
891 "component (%d/%d)", &cons->expr->where,
892 cons->expr->rank, rank);
896 /* If we don't have the right type, try to convert it. */
898 if (!gfc_compare_types (&cons->expr->ts, &comp->ts))
901 if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
902 gfc_error ("The element in the derived type constructor at %L, "
903 "for pointer component '%s', is %s but should be %s",
904 &cons->expr->where, comp->name,
905 gfc_basic_typename (cons->expr->ts.type),
906 gfc_basic_typename (comp->ts.type));
908 t = gfc_convert_type (cons->expr, &comp->ts, 1);
911 if (cons->expr->expr_type == EXPR_NULL
912 && !(comp->attr.pointer || comp->attr.allocatable
913 || comp->attr.proc_pointer
914 || (comp->ts.type == BT_CLASS
915 && (comp->ts.u.derived->components->attr.pointer
916 || comp->ts.u.derived->components->attr.allocatable))))
919 gfc_error ("The NULL in the derived type constructor at %L is "
920 "being applied to component '%s', which is neither "
921 "a POINTER nor ALLOCATABLE", &cons->expr->where,
925 if (!comp->attr.pointer || cons->expr->expr_type == EXPR_NULL)
928 a = gfc_expr_attr (cons->expr);
930 if (!a.pointer && !a.target)
933 gfc_error ("The element in the derived type constructor at %L, "
934 "for pointer component '%s' should be a POINTER or "
935 "a TARGET", &cons->expr->where, comp->name);
938 /* F2003, C1272 (3). */
939 if (gfc_pure (NULL) && cons->expr->expr_type == EXPR_VARIABLE
940 && (gfc_impure_variable (cons->expr->symtree->n.sym)
941 || gfc_is_coindexed (cons->expr)))
944 gfc_error ("Invalid expression in the derived type constructor for "
945 "pointer component '%s' at %L in PURE procedure",
946 comp->name, &cons->expr->where);
954 /****************** Expression name resolution ******************/
956 /* Returns 0 if a symbol was not declared with a type or
957 attribute declaration statement, nonzero otherwise. */
960 was_declared (gfc_symbol *sym)
966 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
969 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
970 || a.optional || a.pointer || a.save || a.target || a.volatile_
971 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
972 || a.asynchronous || a.codimension)
979 /* Determine if a symbol is generic or not. */
982 generic_sym (gfc_symbol *sym)
986 if (sym->attr.generic ||
987 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
990 if (was_declared (sym) || sym->ns->parent == NULL)
993 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1000 return generic_sym (s);
1007 /* Determine if a symbol is specific or not. */
1010 specific_sym (gfc_symbol *sym)
1014 if (sym->attr.if_source == IFSRC_IFBODY
1015 || sym->attr.proc == PROC_MODULE
1016 || sym->attr.proc == PROC_INTERNAL
1017 || sym->attr.proc == PROC_ST_FUNCTION
1018 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
1019 || sym->attr.external)
1022 if (was_declared (sym) || sym->ns->parent == NULL)
1025 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1027 return (s == NULL) ? 0 : specific_sym (s);
1031 /* Figure out if the procedure is specific, generic or unknown. */
1034 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1038 procedure_kind (gfc_symbol *sym)
1040 if (generic_sym (sym))
1041 return PTYPE_GENERIC;
1043 if (specific_sym (sym))
1044 return PTYPE_SPECIFIC;
1046 return PTYPE_UNKNOWN;
1049 /* Check references to assumed size arrays. The flag need_full_assumed_size
1050 is nonzero when matching actual arguments. */
1052 static int need_full_assumed_size = 0;
1055 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1057 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1060 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1061 What should it be? */
1062 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1063 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1064 && (e->ref->u.ar.type == AR_FULL))
1066 gfc_error ("The upper bound in the last dimension must "
1067 "appear in the reference to the assumed size "
1068 "array '%s' at %L", sym->name, &e->where);
1075 /* Look for bad assumed size array references in argument expressions
1076 of elemental and array valued intrinsic procedures. Since this is
1077 called from procedure resolution functions, it only recurses at
1081 resolve_assumed_size_actual (gfc_expr *e)
1086 switch (e->expr_type)
1089 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1094 if (resolve_assumed_size_actual (e->value.op.op1)
1095 || resolve_assumed_size_actual (e->value.op.op2))
1106 /* Check a generic procedure, passed as an actual argument, to see if
1107 there is a matching specific name. If none, it is an error, and if
1108 more than one, the reference is ambiguous. */
1110 count_specific_procs (gfc_expr *e)
1117 sym = e->symtree->n.sym;
1119 for (p = sym->generic; p; p = p->next)
1120 if (strcmp (sym->name, p->sym->name) == 0)
1122 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1128 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1132 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1133 "argument at %L", sym->name, &e->where);
1139 /* See if a call to sym could possibly be a not allowed RECURSION because of
1140 a missing RECURIVE declaration. This means that either sym is the current
1141 context itself, or sym is the parent of a contained procedure calling its
1142 non-RECURSIVE containing procedure.
1143 This also works if sym is an ENTRY. */
1146 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1148 gfc_symbol* proc_sym;
1149 gfc_symbol* context_proc;
1150 gfc_namespace* real_context;
1152 if (sym->attr.flavor == FL_PROGRAM)
1155 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1157 /* If we've got an ENTRY, find real procedure. */
1158 if (sym->attr.entry && sym->ns->entries)
1159 proc_sym = sym->ns->entries->sym;
1163 /* If sym is RECURSIVE, all is well of course. */
1164 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1167 /* Find the context procedure's "real" symbol if it has entries.
1168 We look for a procedure symbol, so recurse on the parents if we don't
1169 find one (like in case of a BLOCK construct). */
1170 for (real_context = context; ; real_context = real_context->parent)
1172 /* We should find something, eventually! */
1173 gcc_assert (real_context);
1175 context_proc = (real_context->entries ? real_context->entries->sym
1176 : real_context->proc_name);
1178 /* In some special cases, there may not be a proc_name, like for this
1180 real(bad_kind()) function foo () ...
1181 when checking the call to bad_kind ().
1182 In these cases, we simply return here and assume that the
1187 if (context_proc->attr.flavor != FL_LABEL)
1191 /* A call from sym's body to itself is recursion, of course. */
1192 if (context_proc == proc_sym)
1195 /* The same is true if context is a contained procedure and sym the
1197 if (context_proc->attr.contained)
1199 gfc_symbol* parent_proc;
1201 gcc_assert (context->parent);
1202 parent_proc = (context->parent->entries ? context->parent->entries->sym
1203 : context->parent->proc_name);
1205 if (parent_proc == proc_sym)
1213 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1214 its typespec and formal argument list. */
1217 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1219 gfc_intrinsic_sym* isym;
1225 /* We already know this one is an intrinsic, so we don't call
1226 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1227 gfc_find_subroutine directly to check whether it is a function or
1230 if ((isym = gfc_find_function (sym->name)))
1232 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1233 && !sym->attr.implicit_type)
1234 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1235 " ignored", sym->name, &sym->declared_at);
1237 if (!sym->attr.function &&
1238 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1243 else if ((isym = gfc_find_subroutine (sym->name)))
1245 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1247 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1248 " specifier", sym->name, &sym->declared_at);
1252 if (!sym->attr.subroutine &&
1253 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1258 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1263 gfc_copy_formal_args_intr (sym, isym);
1265 /* Check it is actually available in the standard settings. */
1266 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1269 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1270 " available in the current standard settings but %s. Use"
1271 " an appropriate -std=* option or enable -fall-intrinsics"
1272 " in order to use it.",
1273 sym->name, &sym->declared_at, symstd);
1281 /* Resolve a procedure expression, like passing it to a called procedure or as
1282 RHS for a procedure pointer assignment. */
1285 resolve_procedure_expression (gfc_expr* expr)
1289 if (expr->expr_type != EXPR_VARIABLE)
1291 gcc_assert (expr->symtree);
1293 sym = expr->symtree->n.sym;
1295 if (sym->attr.intrinsic)
1296 resolve_intrinsic (sym, &expr->where);
1298 if (sym->attr.flavor != FL_PROCEDURE
1299 || (sym->attr.function && sym->result == sym))
1302 /* A non-RECURSIVE procedure that is used as procedure expression within its
1303 own body is in danger of being called recursively. */
1304 if (is_illegal_recursion (sym, gfc_current_ns))
1305 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1306 " itself recursively. Declare it RECURSIVE or use"
1307 " -frecursive", sym->name, &expr->where);
1313 /* Resolve an actual argument list. Most of the time, this is just
1314 resolving the expressions in the list.
1315 The exception is that we sometimes have to decide whether arguments
1316 that look like procedure arguments are really simple variable
1320 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1321 bool no_formal_args)
1324 gfc_symtree *parent_st;
1326 int save_need_full_assumed_size;
1327 gfc_component *comp;
1329 for (; arg; arg = arg->next)
1334 /* Check the label is a valid branching target. */
1337 if (arg->label->defined == ST_LABEL_UNKNOWN)
1339 gfc_error ("Label %d referenced at %L is never defined",
1340 arg->label->value, &arg->label->where);
1347 if (gfc_is_proc_ptr_comp (e, &comp))
1350 if (e->expr_type == EXPR_PPC)
1352 if (comp->as != NULL)
1353 e->rank = comp->as->rank;
1354 e->expr_type = EXPR_FUNCTION;
1356 if (gfc_resolve_expr (e) == FAILURE)
1361 if (e->expr_type == EXPR_VARIABLE
1362 && e->symtree->n.sym->attr.generic
1364 && count_specific_procs (e) != 1)
1367 if (e->ts.type != BT_PROCEDURE)
1369 save_need_full_assumed_size = need_full_assumed_size;
1370 if (e->expr_type != EXPR_VARIABLE)
1371 need_full_assumed_size = 0;
1372 if (gfc_resolve_expr (e) != SUCCESS)
1374 need_full_assumed_size = save_need_full_assumed_size;
1378 /* See if the expression node should really be a variable reference. */
1380 sym = e->symtree->n.sym;
1382 if (sym->attr.flavor == FL_PROCEDURE
1383 || sym->attr.intrinsic
1384 || sym->attr.external)
1388 /* If a procedure is not already determined to be something else
1389 check if it is intrinsic. */
1390 if (!sym->attr.intrinsic
1391 && !(sym->attr.external || sym->attr.use_assoc
1392 || sym->attr.if_source == IFSRC_IFBODY)
1393 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1394 sym->attr.intrinsic = 1;
1396 if (sym->attr.proc == PROC_ST_FUNCTION)
1398 gfc_error ("Statement function '%s' at %L is not allowed as an "
1399 "actual argument", sym->name, &e->where);
1402 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1403 sym->attr.subroutine);
1404 if (sym->attr.intrinsic && actual_ok == 0)
1406 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1407 "actual argument", sym->name, &e->where);
1410 if (sym->attr.contained && !sym->attr.use_assoc
1411 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1413 gfc_error ("Internal procedure '%s' is not allowed as an "
1414 "actual argument at %L", sym->name, &e->where);
1417 if (sym->attr.elemental && !sym->attr.intrinsic)
1419 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1420 "allowed as an actual argument at %L", sym->name,
1424 /* Check if a generic interface has a specific procedure
1425 with the same name before emitting an error. */
1426 if (sym->attr.generic && count_specific_procs (e) != 1)
1429 /* Just in case a specific was found for the expression. */
1430 sym = e->symtree->n.sym;
1432 /* If the symbol is the function that names the current (or
1433 parent) scope, then we really have a variable reference. */
1435 if (gfc_is_function_return_value (sym, sym->ns))
1438 /* If all else fails, see if we have a specific intrinsic. */
1439 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1441 gfc_intrinsic_sym *isym;
1443 isym = gfc_find_function (sym->name);
1444 if (isym == NULL || !isym->specific)
1446 gfc_error ("Unable to find a specific INTRINSIC procedure "
1447 "for the reference '%s' at %L", sym->name,
1452 sym->attr.intrinsic = 1;
1453 sym->attr.function = 1;
1456 if (gfc_resolve_expr (e) == FAILURE)
1461 /* See if the name is a module procedure in a parent unit. */
1463 if (was_declared (sym) || sym->ns->parent == NULL)
1466 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1468 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1472 if (parent_st == NULL)
1475 sym = parent_st->n.sym;
1476 e->symtree = parent_st; /* Point to the right thing. */
1478 if (sym->attr.flavor == FL_PROCEDURE
1479 || sym->attr.intrinsic
1480 || sym->attr.external)
1482 if (gfc_resolve_expr (e) == FAILURE)
1488 e->expr_type = EXPR_VARIABLE;
1490 if (sym->as != NULL)
1492 e->rank = sym->as->rank;
1493 e->ref = gfc_get_ref ();
1494 e->ref->type = REF_ARRAY;
1495 e->ref->u.ar.type = AR_FULL;
1496 e->ref->u.ar.as = sym->as;
1499 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1500 primary.c (match_actual_arg). If above code determines that it
1501 is a variable instead, it needs to be resolved as it was not
1502 done at the beginning of this function. */
1503 save_need_full_assumed_size = need_full_assumed_size;
1504 if (e->expr_type != EXPR_VARIABLE)
1505 need_full_assumed_size = 0;
1506 if (gfc_resolve_expr (e) != SUCCESS)
1508 need_full_assumed_size = save_need_full_assumed_size;
1511 /* Check argument list functions %VAL, %LOC and %REF. There is
1512 nothing to do for %REF. */
1513 if (arg->name && arg->name[0] == '%')
1515 if (strncmp ("%VAL", arg->name, 4) == 0)
1517 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1519 gfc_error ("By-value argument at %L is not of numeric "
1526 gfc_error ("By-value argument at %L cannot be an array or "
1527 "an array section", &e->where);
1531 /* Intrinsics are still PROC_UNKNOWN here. However,
1532 since same file external procedures are not resolvable
1533 in gfortran, it is a good deal easier to leave them to
1535 if (ptype != PROC_UNKNOWN
1536 && ptype != PROC_DUMMY
1537 && ptype != PROC_EXTERNAL
1538 && ptype != PROC_MODULE)
1540 gfc_error ("By-value argument at %L is not allowed "
1541 "in this context", &e->where);
1546 /* Statement functions have already been excluded above. */
1547 else if (strncmp ("%LOC", arg->name, 4) == 0
1548 && e->ts.type == BT_PROCEDURE)
1550 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1552 gfc_error ("Passing internal procedure at %L by location "
1553 "not allowed", &e->where);
1559 /* Fortran 2008, C1237. */
1560 if (e->expr_type == EXPR_VARIABLE && gfc_is_coindexed (e)
1561 && gfc_has_ultimate_pointer (e))
1563 gfc_error ("Coindexed actual argument at %L with ultimate pointer "
1564 "component", &e->where);
1573 /* Do the checks of the actual argument list that are specific to elemental
1574 procedures. If called with c == NULL, we have a function, otherwise if
1575 expr == NULL, we have a subroutine. */
1578 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1580 gfc_actual_arglist *arg0;
1581 gfc_actual_arglist *arg;
1582 gfc_symbol *esym = NULL;
1583 gfc_intrinsic_sym *isym = NULL;
1585 gfc_intrinsic_arg *iformal = NULL;
1586 gfc_formal_arglist *eformal = NULL;
1587 bool formal_optional = false;
1588 bool set_by_optional = false;
1592 /* Is this an elemental procedure? */
1593 if (expr && expr->value.function.actual != NULL)
1595 if (expr->value.function.esym != NULL
1596 && expr->value.function.esym->attr.elemental)
1598 arg0 = expr->value.function.actual;
1599 esym = expr->value.function.esym;
1601 else if (expr->value.function.isym != NULL
1602 && expr->value.function.isym->elemental)
1604 arg0 = expr->value.function.actual;
1605 isym = expr->value.function.isym;
1610 else if (c && c->ext.actual != NULL)
1612 arg0 = c->ext.actual;
1614 if (c->resolved_sym)
1615 esym = c->resolved_sym;
1617 esym = c->symtree->n.sym;
1620 if (!esym->attr.elemental)
1626 /* The rank of an elemental is the rank of its array argument(s). */
1627 for (arg = arg0; arg; arg = arg->next)
1629 if (arg->expr != NULL && arg->expr->rank > 0)
1631 rank = arg->expr->rank;
1632 if (arg->expr->expr_type == EXPR_VARIABLE
1633 && arg->expr->symtree->n.sym->attr.optional)
1634 set_by_optional = true;
1636 /* Function specific; set the result rank and shape. */
1640 if (!expr->shape && arg->expr->shape)
1642 expr->shape = gfc_get_shape (rank);
1643 for (i = 0; i < rank; i++)
1644 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1651 /* If it is an array, it shall not be supplied as an actual argument
1652 to an elemental procedure unless an array of the same rank is supplied
1653 as an actual argument corresponding to a nonoptional dummy argument of
1654 that elemental procedure(12.4.1.5). */
1655 formal_optional = false;
1657 iformal = isym->formal;
1659 eformal = esym->formal;
1661 for (arg = arg0; arg; arg = arg->next)
1665 if (eformal->sym && eformal->sym->attr.optional)
1666 formal_optional = true;
1667 eformal = eformal->next;
1669 else if (isym && iformal)
1671 if (iformal->optional)
1672 formal_optional = true;
1673 iformal = iformal->next;
1676 formal_optional = true;
1678 if (pedantic && arg->expr != NULL
1679 && arg->expr->expr_type == EXPR_VARIABLE
1680 && arg->expr->symtree->n.sym->attr.optional
1683 && (set_by_optional || arg->expr->rank != rank)
1684 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1686 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1687 "MISSING, it cannot be the actual argument of an "
1688 "ELEMENTAL procedure unless there is a non-optional "
1689 "argument with the same rank (12.4.1.5)",
1690 arg->expr->symtree->n.sym->name, &arg->expr->where);
1695 for (arg = arg0; arg; arg = arg->next)
1697 if (arg->expr == NULL || arg->expr->rank == 0)
1700 /* Being elemental, the last upper bound of an assumed size array
1701 argument must be present. */
1702 if (resolve_assumed_size_actual (arg->expr))
1705 /* Elemental procedure's array actual arguments must conform. */
1708 if (gfc_check_conformance (arg->expr, e,
1709 "elemental procedure") == FAILURE)
1716 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1717 is an array, the intent inout/out variable needs to be also an array. */
1718 if (rank > 0 && esym && expr == NULL)
1719 for (eformal = esym->formal, arg = arg0; arg && eformal;
1720 arg = arg->next, eformal = eformal->next)
1721 if ((eformal->sym->attr.intent == INTENT_OUT
1722 || eformal->sym->attr.intent == INTENT_INOUT)
1723 && arg->expr && arg->expr->rank == 0)
1725 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1726 "ELEMENTAL subroutine '%s' is a scalar, but another "
1727 "actual argument is an array", &arg->expr->where,
1728 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1729 : "INOUT", eformal->sym->name, esym->name);
1736 /* Go through each actual argument in ACTUAL and see if it can be
1737 implemented as an inlined, non-copying intrinsic. FNSYM is the
1738 function being called, or NULL if not known. */
1741 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1743 gfc_actual_arglist *ap;
1746 for (ap = actual; ap; ap = ap->next)
1748 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1749 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1751 ap->expr->inline_noncopying_intrinsic = 1;
1755 /* This function does the checking of references to global procedures
1756 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1757 77 and 95 standards. It checks for a gsymbol for the name, making
1758 one if it does not already exist. If it already exists, then the
1759 reference being resolved must correspond to the type of gsymbol.
1760 Otherwise, the new symbol is equipped with the attributes of the
1761 reference. The corresponding code that is called in creating
1762 global entities is parse.c.
1764 In addition, for all but -std=legacy, the gsymbols are used to
1765 check the interfaces of external procedures from the same file.
1766 The namespace of the gsymbol is resolved and then, once this is
1767 done the interface is checked. */
1771 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1773 if (!gsym_ns->proc_name->attr.recursive)
1776 if (sym->ns == gsym_ns)
1779 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1786 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1788 if (gsym_ns->entries)
1790 gfc_entry_list *entry = gsym_ns->entries;
1792 for (; entry; entry = entry->next)
1794 if (strcmp (sym->name, entry->sym->name) == 0)
1796 if (strcmp (gsym_ns->proc_name->name,
1797 sym->ns->proc_name->name) == 0)
1801 && strcmp (gsym_ns->proc_name->name,
1802 sym->ns->parent->proc_name->name) == 0)
1811 resolve_global_procedure (gfc_symbol *sym, locus *where,
1812 gfc_actual_arglist **actual, int sub)
1816 enum gfc_symbol_type type;
1818 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1820 gsym = gfc_get_gsymbol (sym->name);
1822 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1823 gfc_global_used (gsym, where);
1825 if (gfc_option.flag_whole_file
1826 && sym->attr.if_source == IFSRC_UNKNOWN
1827 && gsym->type != GSYM_UNKNOWN
1829 && gsym->ns->resolved != -1
1830 && gsym->ns->proc_name
1831 && not_in_recursive (sym, gsym->ns)
1832 && not_entry_self_reference (sym, gsym->ns))
1834 /* Make sure that translation for the gsymbol occurs before
1835 the procedure currently being resolved. */
1836 ns = gsym->ns->resolved ? NULL : gfc_global_ns_list;
1837 for (; ns && ns != gsym->ns; ns = ns->sibling)
1839 if (ns->sibling == gsym->ns)
1841 ns->sibling = gsym->ns->sibling;
1842 gsym->ns->sibling = gfc_global_ns_list;
1843 gfc_global_ns_list = gsym->ns;
1848 if (!gsym->ns->resolved)
1850 gfc_dt_list *old_dt_list;
1852 /* Stash away derived types so that the backend_decls do not
1854 old_dt_list = gfc_derived_types;
1855 gfc_derived_types = NULL;
1857 gfc_resolve (gsym->ns);
1859 /* Store the new derived types with the global namespace. */
1860 if (gfc_derived_types)
1861 gsym->ns->derived_types = gfc_derived_types;
1863 /* Restore the derived types of this namespace. */
1864 gfc_derived_types = old_dt_list;
1867 if (gsym->ns->proc_name->attr.function
1868 && gsym->ns->proc_name->as
1869 && gsym->ns->proc_name->as->rank
1870 && (!sym->as || sym->as->rank != gsym->ns->proc_name->as->rank))
1871 gfc_error ("The reference to function '%s' at %L either needs an "
1872 "explicit INTERFACE or the rank is incorrect", sym->name,
1875 /* Non-assumed length character functions. */
1876 if (sym->attr.function && sym->ts.type == BT_CHARACTER
1877 && gsym->ns->proc_name->ts.u.cl != NULL
1878 && gsym->ns->proc_name->ts.u.cl->length != NULL)
1880 gfc_charlen *cl = sym->ts.u.cl;
1882 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
1883 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
1885 gfc_error ("Nonconstant character-length function '%s' at %L "
1886 "must have an explicit interface", sym->name,
1891 if (gfc_option.flag_whole_file == 1
1892 || ((gfc_option.warn_std & GFC_STD_LEGACY)
1894 !(gfc_option.warn_std & GFC_STD_GNU)))
1895 gfc_errors_to_warnings (1);
1897 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1899 gfc_errors_to_warnings (0);
1902 if (gsym->type == GSYM_UNKNOWN)
1905 gsym->where = *where;
1912 /************* Function resolution *************/
1914 /* Resolve a function call known to be generic.
1915 Section 14.1.2.4.1. */
1918 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1922 if (sym->attr.generic)
1924 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1927 expr->value.function.name = s->name;
1928 expr->value.function.esym = s;
1930 if (s->ts.type != BT_UNKNOWN)
1932 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1933 expr->ts = s->result->ts;
1936 expr->rank = s->as->rank;
1937 else if (s->result != NULL && s->result->as != NULL)
1938 expr->rank = s->result->as->rank;
1940 gfc_set_sym_referenced (expr->value.function.esym);
1945 /* TODO: Need to search for elemental references in generic
1949 if (sym->attr.intrinsic)
1950 return gfc_intrinsic_func_interface (expr, 0);
1957 resolve_generic_f (gfc_expr *expr)
1962 sym = expr->symtree->n.sym;
1966 m = resolve_generic_f0 (expr, sym);
1969 else if (m == MATCH_ERROR)
1973 if (sym->ns->parent == NULL)
1975 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1979 if (!generic_sym (sym))
1983 /* Last ditch attempt. See if the reference is to an intrinsic
1984 that possesses a matching interface. 14.1.2.4 */
1985 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
1987 gfc_error ("There is no specific function for the generic '%s' at %L",
1988 expr->symtree->n.sym->name, &expr->where);
1992 m = gfc_intrinsic_func_interface (expr, 0);
1996 gfc_error ("Generic function '%s' at %L is not consistent with a "
1997 "specific intrinsic interface", expr->symtree->n.sym->name,
2004 /* Resolve a function call known to be specific. */
2007 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
2011 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2013 if (sym->attr.dummy)
2015 sym->attr.proc = PROC_DUMMY;
2019 sym->attr.proc = PROC_EXTERNAL;
2023 if (sym->attr.proc == PROC_MODULE
2024 || sym->attr.proc == PROC_ST_FUNCTION
2025 || sym->attr.proc == PROC_INTERNAL)
2028 if (sym->attr.intrinsic)
2030 m = gfc_intrinsic_func_interface (expr, 1);
2034 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2035 "with an intrinsic", sym->name, &expr->where);
2043 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2046 expr->ts = sym->result->ts;
2049 expr->value.function.name = sym->name;
2050 expr->value.function.esym = sym;
2051 if (sym->as != NULL)
2052 expr->rank = sym->as->rank;
2059 resolve_specific_f (gfc_expr *expr)
2064 sym = expr->symtree->n.sym;
2068 m = resolve_specific_f0 (sym, expr);
2071 if (m == MATCH_ERROR)
2074 if (sym->ns->parent == NULL)
2077 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2083 gfc_error ("Unable to resolve the specific function '%s' at %L",
2084 expr->symtree->n.sym->name, &expr->where);
2090 /* Resolve a procedure call not known to be generic nor specific. */
2093 resolve_unknown_f (gfc_expr *expr)
2098 sym = expr->symtree->n.sym;
2100 if (sym->attr.dummy)
2102 sym->attr.proc = PROC_DUMMY;
2103 expr->value.function.name = sym->name;
2107 /* See if we have an intrinsic function reference. */
2109 if (gfc_is_intrinsic (sym, 0, expr->where))
2111 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2116 /* The reference is to an external name. */
2118 sym->attr.proc = PROC_EXTERNAL;
2119 expr->value.function.name = sym->name;
2120 expr->value.function.esym = expr->symtree->n.sym;
2122 if (sym->as != NULL)
2123 expr->rank = sym->as->rank;
2125 /* Type of the expression is either the type of the symbol or the
2126 default type of the symbol. */
2129 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2131 if (sym->ts.type != BT_UNKNOWN)
2135 ts = gfc_get_default_type (sym->name, sym->ns);
2137 if (ts->type == BT_UNKNOWN)
2139 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2140 sym->name, &expr->where);
2151 /* Return true, if the symbol is an external procedure. */
2153 is_external_proc (gfc_symbol *sym)
2155 if (!sym->attr.dummy && !sym->attr.contained
2156 && !(sym->attr.intrinsic
2157 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2158 && sym->attr.proc != PROC_ST_FUNCTION
2159 && !sym->attr.use_assoc
2167 /* Figure out if a function reference is pure or not. Also set the name
2168 of the function for a potential error message. Return nonzero if the
2169 function is PURE, zero if not. */
2171 pure_stmt_function (gfc_expr *, gfc_symbol *);
2174 pure_function (gfc_expr *e, const char **name)
2180 if (e->symtree != NULL
2181 && e->symtree->n.sym != NULL
2182 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2183 return pure_stmt_function (e, e->symtree->n.sym);
2185 if (e->value.function.esym)
2187 pure = gfc_pure (e->value.function.esym);
2188 *name = e->value.function.esym->name;
2190 else if (e->value.function.isym)
2192 pure = e->value.function.isym->pure
2193 || e->value.function.isym->elemental;
2194 *name = e->value.function.isym->name;
2198 /* Implicit functions are not pure. */
2200 *name = e->value.function.name;
2208 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2209 int *f ATTRIBUTE_UNUSED)
2213 /* Don't bother recursing into other statement functions
2214 since they will be checked individually for purity. */
2215 if (e->expr_type != EXPR_FUNCTION
2217 || e->symtree->n.sym == sym
2218 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2221 return pure_function (e, &name) ? false : true;
2226 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2228 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2233 is_scalar_expr_ptr (gfc_expr *expr)
2235 gfc_try retval = SUCCESS;
2240 /* See if we have a gfc_ref, which means we have a substring, array
2241 reference, or a component. */
2242 if (expr->ref != NULL)
2245 while (ref->next != NULL)
2251 if (ref->u.ss.length != NULL
2252 && ref->u.ss.length->length != NULL
2254 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2256 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2258 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2259 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2260 if (end - start + 1 != 1)
2267 if (ref->u.ar.type == AR_ELEMENT)
2269 else if (ref->u.ar.type == AR_FULL)
2271 /* The user can give a full array if the array is of size 1. */
2272 if (ref->u.ar.as != NULL
2273 && ref->u.ar.as->rank == 1
2274 && ref->u.ar.as->type == AS_EXPLICIT
2275 && ref->u.ar.as->lower[0] != NULL
2276 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2277 && ref->u.ar.as->upper[0] != NULL
2278 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2280 /* If we have a character string, we need to check if
2281 its length is one. */
2282 if (expr->ts.type == BT_CHARACTER)
2284 if (expr->ts.u.cl == NULL
2285 || expr->ts.u.cl->length == NULL
2286 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2292 /* We have constant lower and upper bounds. If the
2293 difference between is 1, it can be considered a
2295 start = (int) mpz_get_si
2296 (ref->u.ar.as->lower[0]->value.integer);
2297 end = (int) mpz_get_si
2298 (ref->u.ar.as->upper[0]->value.integer);
2299 if (end - start + 1 != 1)
2314 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2316 /* Character string. Make sure it's of length 1. */
2317 if (expr->ts.u.cl == NULL
2318 || expr->ts.u.cl->length == NULL
2319 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2322 else if (expr->rank != 0)
2329 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2330 and, in the case of c_associated, set the binding label based on
2334 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2335 gfc_symbol **new_sym)
2337 char name[GFC_MAX_SYMBOL_LEN + 1];
2338 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2339 int optional_arg = 0, is_pointer = 0;
2340 gfc_try retval = SUCCESS;
2341 gfc_symbol *args_sym;
2342 gfc_typespec *arg_ts;
2344 if (args->expr->expr_type == EXPR_CONSTANT
2345 || args->expr->expr_type == EXPR_OP
2346 || args->expr->expr_type == EXPR_NULL)
2348 gfc_error ("Argument to '%s' at %L is not a variable",
2349 sym->name, &(args->expr->where));
2353 args_sym = args->expr->symtree->n.sym;
2355 /* The typespec for the actual arg should be that stored in the expr
2356 and not necessarily that of the expr symbol (args_sym), because
2357 the actual expression could be a part-ref of the expr symbol. */
2358 arg_ts = &(args->expr->ts);
2360 is_pointer = gfc_is_data_pointer (args->expr);
2362 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2364 /* If the user gave two args then they are providing something for
2365 the optional arg (the second cptr). Therefore, set the name and
2366 binding label to the c_associated for two cptrs. Otherwise,
2367 set c_associated to expect one cptr. */
2371 sprintf (name, "%s_2", sym->name);
2372 sprintf (binding_label, "%s_2", sym->binding_label);
2378 sprintf (name, "%s_1", sym->name);
2379 sprintf (binding_label, "%s_1", sym->binding_label);
2383 /* Get a new symbol for the version of c_associated that
2385 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2387 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2388 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2390 sprintf (name, "%s", sym->name);
2391 sprintf (binding_label, "%s", sym->binding_label);
2393 /* Error check the call. */
2394 if (args->next != NULL)
2396 gfc_error_now ("More actual than formal arguments in '%s' "
2397 "call at %L", name, &(args->expr->where));
2400 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2402 /* Make sure we have either the target or pointer attribute. */
2403 if (!args_sym->attr.target && !is_pointer)
2405 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2406 "a TARGET or an associated pointer",
2408 sym->name, &(args->expr->where));
2412 /* See if we have interoperable type and type param. */
2413 if (verify_c_interop (arg_ts) == SUCCESS
2414 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2416 if (args_sym->attr.target == 1)
2418 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2419 has the target attribute and is interoperable. */
2420 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2421 allocatable variable that has the TARGET attribute and
2422 is not an array of zero size. */
2423 if (args_sym->attr.allocatable == 1)
2425 if (args_sym->attr.dimension != 0
2426 && (args_sym->as && args_sym->as->rank == 0))
2428 gfc_error_now ("Allocatable variable '%s' used as a "
2429 "parameter to '%s' at %L must not be "
2430 "an array of zero size",
2431 args_sym->name, sym->name,
2432 &(args->expr->where));
2438 /* A non-allocatable target variable with C
2439 interoperable type and type parameters must be
2441 if (args_sym && args_sym->attr.dimension)
2443 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2445 gfc_error ("Assumed-shape array '%s' at %L "
2446 "cannot be an argument to the "
2447 "procedure '%s' because "
2448 "it is not C interoperable",
2450 &(args->expr->where), sym->name);
2453 else if (args_sym->as->type == AS_DEFERRED)
2455 gfc_error ("Deferred-shape array '%s' at %L "
2456 "cannot be an argument to the "
2457 "procedure '%s' because "
2458 "it is not C interoperable",
2460 &(args->expr->where), sym->name);
2465 /* Make sure it's not a character string. Arrays of
2466 any type should be ok if the variable is of a C
2467 interoperable type. */
2468 if (arg_ts->type == BT_CHARACTER)
2469 if (arg_ts->u.cl != NULL
2470 && (arg_ts->u.cl->length == NULL
2471 || arg_ts->u.cl->length->expr_type
2474 (arg_ts->u.cl->length->value.integer, 1)
2476 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2478 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2479 "at %L must have a length of 1",
2480 args_sym->name, sym->name,
2481 &(args->expr->where));
2487 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2489 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2491 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2492 "associated scalar POINTER", args_sym->name,
2493 sym->name, &(args->expr->where));
2499 /* The parameter is not required to be C interoperable. If it
2500 is not C interoperable, it must be a nonpolymorphic scalar
2501 with no length type parameters. It still must have either
2502 the pointer or target attribute, and it can be
2503 allocatable (but must be allocated when c_loc is called). */
2504 if (args->expr->rank != 0
2505 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2507 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2508 "scalar", args_sym->name, sym->name,
2509 &(args->expr->where));
2512 else if (arg_ts->type == BT_CHARACTER
2513 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2515 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2516 "%L must have a length of 1",
2517 args_sym->name, sym->name,
2518 &(args->expr->where));
2523 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2525 if (args_sym->attr.flavor != FL_PROCEDURE)
2527 /* TODO: Update this error message to allow for procedure
2528 pointers once they are implemented. */
2529 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2531 args_sym->name, sym->name,
2532 &(args->expr->where));
2535 else if (args_sym->attr.is_bind_c != 1)
2537 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2539 args_sym->name, sym->name,
2540 &(args->expr->where));
2545 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2550 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2551 "iso_c_binding function: '%s'!\n", sym->name);
2558 /* Resolve a function call, which means resolving the arguments, then figuring
2559 out which entity the name refers to. */
2560 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2561 to INTENT(OUT) or INTENT(INOUT). */
2564 resolve_function (gfc_expr *expr)
2566 gfc_actual_arglist *arg;
2571 procedure_type p = PROC_INTRINSIC;
2572 bool no_formal_args;
2576 sym = expr->symtree->n.sym;
2578 /* If this is a procedure pointer component, it has already been resolved. */
2579 if (gfc_is_proc_ptr_comp (expr, NULL))
2582 if (sym && sym->attr.intrinsic
2583 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2586 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2588 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2592 /* If this ia a deferred TBP with an abstract interface (which may
2593 of course be referenced), expr->value.function.esym will be set. */
2594 if (sym && sym->attr.abstract && !expr->value.function.esym)
2596 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2597 sym->name, &expr->where);
2601 /* Switch off assumed size checking and do this again for certain kinds
2602 of procedure, once the procedure itself is resolved. */
2603 need_full_assumed_size++;
2605 if (expr->symtree && expr->symtree->n.sym)
2606 p = expr->symtree->n.sym->attr.proc;
2608 if (expr->value.function.isym && expr->value.function.isym->inquiry)
2609 inquiry_argument = true;
2610 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2612 if (resolve_actual_arglist (expr->value.function.actual,
2613 p, no_formal_args) == FAILURE)
2615 inquiry_argument = false;
2619 inquiry_argument = false;
2621 /* Need to setup the call to the correct c_associated, depending on
2622 the number of cptrs to user gives to compare. */
2623 if (sym && sym->attr.is_iso_c == 1)
2625 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2629 /* Get the symtree for the new symbol (resolved func).
2630 the old one will be freed later, when it's no longer used. */
2631 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2634 /* Resume assumed_size checking. */
2635 need_full_assumed_size--;
2637 /* If the procedure is external, check for usage. */
2638 if (sym && is_external_proc (sym))
2639 resolve_global_procedure (sym, &expr->where,
2640 &expr->value.function.actual, 0);
2642 if (sym && sym->ts.type == BT_CHARACTER
2644 && sym->ts.u.cl->length == NULL
2646 && expr->value.function.esym == NULL
2647 && !sym->attr.contained)
2649 /* Internal procedures are taken care of in resolve_contained_fntype. */
2650 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2651 "be used at %L since it is not a dummy argument",
2652 sym->name, &expr->where);
2656 /* See if function is already resolved. */
2658 if (expr->value.function.name != NULL)
2660 if (expr->ts.type == BT_UNKNOWN)
2666 /* Apply the rules of section 14.1.2. */
2668 switch (procedure_kind (sym))
2671 t = resolve_generic_f (expr);
2674 case PTYPE_SPECIFIC:
2675 t = resolve_specific_f (expr);
2679 t = resolve_unknown_f (expr);
2683 gfc_internal_error ("resolve_function(): bad function type");
2687 /* If the expression is still a function (it might have simplified),
2688 then we check to see if we are calling an elemental function. */
2690 if (expr->expr_type != EXPR_FUNCTION)
2693 temp = need_full_assumed_size;
2694 need_full_assumed_size = 0;
2696 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2699 if (omp_workshare_flag
2700 && expr->value.function.esym
2701 && ! gfc_elemental (expr->value.function.esym))
2703 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2704 "in WORKSHARE construct", expr->value.function.esym->name,
2709 #define GENERIC_ID expr->value.function.isym->id
2710 else if (expr->value.function.actual != NULL
2711 && expr->value.function.isym != NULL
2712 && GENERIC_ID != GFC_ISYM_LBOUND
2713 && GENERIC_ID != GFC_ISYM_LEN
2714 && GENERIC_ID != GFC_ISYM_LOC
2715 && GENERIC_ID != GFC_ISYM_PRESENT)
2717 /* Array intrinsics must also have the last upper bound of an
2718 assumed size array argument. UBOUND and SIZE have to be
2719 excluded from the check if the second argument is anything
2722 for (arg = expr->value.function.actual; arg; arg = arg->next)
2724 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2725 && arg->next != NULL && arg->next->expr)
2727 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2730 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2733 if ((int)mpz_get_si (arg->next->expr->value.integer)
2738 if (arg->expr != NULL
2739 && arg->expr->rank > 0
2740 && resolve_assumed_size_actual (arg->expr))
2746 need_full_assumed_size = temp;
2749 if (!pure_function (expr, &name) && name)
2753 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2754 "FORALL %s", name, &expr->where,
2755 forall_flag == 2 ? "mask" : "block");
2758 else if (gfc_pure (NULL))
2760 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2761 "procedure within a PURE procedure", name, &expr->where);
2766 /* Functions without the RECURSIVE attribution are not allowed to
2767 * call themselves. */
2768 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2771 esym = expr->value.function.esym;
2773 if (is_illegal_recursion (esym, gfc_current_ns))
2775 if (esym->attr.entry && esym->ns->entries)
2776 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2777 " function '%s' is not RECURSIVE",
2778 esym->name, &expr->where, esym->ns->entries->sym->name);
2780 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2781 " is not RECURSIVE", esym->name, &expr->where);
2787 /* Character lengths of use associated functions may contains references to
2788 symbols not referenced from the current program unit otherwise. Make sure
2789 those symbols are marked as referenced. */
2791 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2792 && expr->value.function.esym->attr.use_assoc)
2794 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
2798 && !((expr->value.function.esym
2799 && expr->value.function.esym->attr.elemental)
2801 (expr->value.function.isym
2802 && expr->value.function.isym->elemental)))
2803 find_noncopying_intrinsics (expr->value.function.esym,
2804 expr->value.function.actual);
2806 /* Make sure that the expression has a typespec that works. */
2807 if (expr->ts.type == BT_UNKNOWN)
2809 if (expr->symtree->n.sym->result
2810 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2811 && !expr->symtree->n.sym->result->attr.proc_pointer)
2812 expr->ts = expr->symtree->n.sym->result->ts;
2819 /************* Subroutine resolution *************/
2822 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2828 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2829 sym->name, &c->loc);
2830 else if (gfc_pure (NULL))
2831 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2837 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2841 if (sym->attr.generic)
2843 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2846 c->resolved_sym = s;
2847 pure_subroutine (c, s);
2851 /* TODO: Need to search for elemental references in generic interface. */
2854 if (sym->attr.intrinsic)
2855 return gfc_intrinsic_sub_interface (c, 0);
2862 resolve_generic_s (gfc_code *c)
2867 sym = c->symtree->n.sym;
2871 m = resolve_generic_s0 (c, sym);
2874 else if (m == MATCH_ERROR)
2878 if (sym->ns->parent == NULL)
2880 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2884 if (!generic_sym (sym))
2888 /* Last ditch attempt. See if the reference is to an intrinsic
2889 that possesses a matching interface. 14.1.2.4 */
2890 sym = c->symtree->n.sym;
2892 if (!gfc_is_intrinsic (sym, 1, c->loc))
2894 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2895 sym->name, &c->loc);
2899 m = gfc_intrinsic_sub_interface (c, 0);
2903 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2904 "intrinsic subroutine interface", sym->name, &c->loc);
2910 /* Set the name and binding label of the subroutine symbol in the call
2911 expression represented by 'c' to include the type and kind of the
2912 second parameter. This function is for resolving the appropriate
2913 version of c_f_pointer() and c_f_procpointer(). For example, a
2914 call to c_f_pointer() for a default integer pointer could have a
2915 name of c_f_pointer_i4. If no second arg exists, which is an error
2916 for these two functions, it defaults to the generic symbol's name
2917 and binding label. */
2920 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2921 char *name, char *binding_label)
2923 gfc_expr *arg = NULL;
2927 /* The second arg of c_f_pointer and c_f_procpointer determines
2928 the type and kind for the procedure name. */
2929 arg = c->ext.actual->next->expr;
2933 /* Set up the name to have the given symbol's name,
2934 plus the type and kind. */
2935 /* a derived type is marked with the type letter 'u' */
2936 if (arg->ts.type == BT_DERIVED)
2939 kind = 0; /* set the kind as 0 for now */
2943 type = gfc_type_letter (arg->ts.type);
2944 kind = arg->ts.kind;
2947 if (arg->ts.type == BT_CHARACTER)
2948 /* Kind info for character strings not needed. */
2951 sprintf (name, "%s_%c%d", sym->name, type, kind);
2952 /* Set up the binding label as the given symbol's label plus
2953 the type and kind. */
2954 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2958 /* If the second arg is missing, set the name and label as
2959 was, cause it should at least be found, and the missing
2960 arg error will be caught by compare_parameters(). */
2961 sprintf (name, "%s", sym->name);
2962 sprintf (binding_label, "%s", sym->binding_label);
2969 /* Resolve a generic version of the iso_c_binding procedure given
2970 (sym) to the specific one based on the type and kind of the
2971 argument(s). Currently, this function resolves c_f_pointer() and
2972 c_f_procpointer based on the type and kind of the second argument
2973 (FPTR). Other iso_c_binding procedures aren't specially handled.
2974 Upon successfully exiting, c->resolved_sym will hold the resolved
2975 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2979 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2981 gfc_symbol *new_sym;
2982 /* this is fine, since we know the names won't use the max */
2983 char name[GFC_MAX_SYMBOL_LEN + 1];
2984 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2985 /* default to success; will override if find error */
2986 match m = MATCH_YES;
2988 /* Make sure the actual arguments are in the necessary order (based on the
2989 formal args) before resolving. */
2990 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2992 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2993 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2995 set_name_and_label (c, sym, name, binding_label);
2997 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2999 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3001 /* Make sure we got a third arg if the second arg has non-zero
3002 rank. We must also check that the type and rank are
3003 correct since we short-circuit this check in
3004 gfc_procedure_use() (called above to sort actual args). */
3005 if (c->ext.actual->next->expr->rank != 0)
3007 if(c->ext.actual->next->next == NULL
3008 || c->ext.actual->next->next->expr == NULL)
3011 gfc_error ("Missing SHAPE parameter for call to %s "
3012 "at %L", sym->name, &(c->loc));
3014 else if (c->ext.actual->next->next->expr->ts.type
3016 || c->ext.actual->next->next->expr->rank != 1)
3019 gfc_error ("SHAPE parameter for call to %s at %L must "
3020 "be a rank 1 INTEGER array", sym->name,
3027 if (m != MATCH_ERROR)
3029 /* the 1 means to add the optional arg to formal list */
3030 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3032 /* for error reporting, say it's declared where the original was */
3033 new_sym->declared_at = sym->declared_at;
3038 /* no differences for c_loc or c_funloc */
3042 /* set the resolved symbol */
3043 if (m != MATCH_ERROR)
3044 c->resolved_sym = new_sym;
3046 c->resolved_sym = sym;
3052 /* Resolve a subroutine call known to be specific. */
3055 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3059 if(sym->attr.is_iso_c)
3061 m = gfc_iso_c_sub_interface (c,sym);
3065 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3067 if (sym->attr.dummy)
3069 sym->attr.proc = PROC_DUMMY;
3073 sym->attr.proc = PROC_EXTERNAL;
3077 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3080 if (sym->attr.intrinsic)
3082 m = gfc_intrinsic_sub_interface (c, 1);
3086 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3087 "with an intrinsic", sym->name, &c->loc);
3095 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3097 c->resolved_sym = sym;
3098 pure_subroutine (c, sym);
3105 resolve_specific_s (gfc_code *c)
3110 sym = c->symtree->n.sym;
3114 m = resolve_specific_s0 (c, sym);
3117 if (m == MATCH_ERROR)
3120 if (sym->ns->parent == NULL)
3123 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3129 sym = c->symtree->n.sym;
3130 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3131 sym->name, &c->loc);
3137 /* Resolve a subroutine call not known to be generic nor specific. */
3140 resolve_unknown_s (gfc_code *c)
3144 sym = c->symtree->n.sym;
3146 if (sym->attr.dummy)
3148 sym->attr.proc = PROC_DUMMY;
3152 /* See if we have an intrinsic function reference. */
3154 if (gfc_is_intrinsic (sym, 1, c->loc))
3156 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3161 /* The reference is to an external name. */
3164 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3166 c->resolved_sym = sym;
3168 pure_subroutine (c, sym);
3174 /* Resolve a subroutine call. Although it was tempting to use the same code
3175 for functions, subroutines and functions are stored differently and this
3176 makes things awkward. */
3179 resolve_call (gfc_code *c)
3182 procedure_type ptype = PROC_INTRINSIC;
3183 gfc_symbol *csym, *sym;
3184 bool no_formal_args;
3186 csym = c->symtree ? c->symtree->n.sym : NULL;
3188 if (csym && csym->ts.type != BT_UNKNOWN)
3190 gfc_error ("'%s' at %L has a type, which is not consistent with "
3191 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3195 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3198 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3199 sym = st ? st->n.sym : NULL;
3200 if (sym && csym != sym
3201 && sym->ns == gfc_current_ns
3202 && sym->attr.flavor == FL_PROCEDURE
3203 && sym->attr.contained)
3206 if (csym->attr.generic)
3207 c->symtree->n.sym = sym;
3210 csym = c->symtree->n.sym;
3214 /* If this ia a deferred TBP with an abstract interface
3215 (which may of course be referenced), c->expr1 will be set. */
3216 if (csym && csym->attr.abstract && !c->expr1)
3218 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3219 csym->name, &c->loc);
3223 /* Subroutines without the RECURSIVE attribution are not allowed to
3224 * call themselves. */
3225 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3227 if (csym->attr.entry && csym->ns->entries)
3228 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3229 " subroutine '%s' is not RECURSIVE",
3230 csym->name, &c->loc, csym->ns->entries->sym->name);
3232 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3233 " is not RECURSIVE", csym->name, &c->loc);
3238 /* Switch off assumed size checking and do this again for certain kinds
3239 of procedure, once the procedure itself is resolved. */
3240 need_full_assumed_size++;
3243 ptype = csym->attr.proc;
3245 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3246 if (resolve_actual_arglist (c->ext.actual, ptype,
3247 no_formal_args) == FAILURE)
3250 /* Resume assumed_size checking. */
3251 need_full_assumed_size--;
3253 /* If external, check for usage. */
3254 if (csym && is_external_proc (csym))
3255 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3258 if (c->resolved_sym == NULL)
3260 c->resolved_isym = NULL;
3261 switch (procedure_kind (csym))
3264 t = resolve_generic_s (c);
3267 case PTYPE_SPECIFIC:
3268 t = resolve_specific_s (c);
3272 t = resolve_unknown_s (c);
3276 gfc_internal_error ("resolve_subroutine(): bad function type");
3280 /* Some checks of elemental subroutine actual arguments. */
3281 if (resolve_elemental_actual (NULL, c) == FAILURE)
3284 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3285 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3290 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3291 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3292 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3293 if their shapes do not match. If either op1->shape or op2->shape is
3294 NULL, return SUCCESS. */
3297 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3304 if (op1->shape != NULL && op2->shape != NULL)
3306 for (i = 0; i < op1->rank; i++)
3308 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3310 gfc_error ("Shapes for operands at %L and %L are not conformable",
3311 &op1->where, &op2->where);
3322 /* Resolve an operator expression node. This can involve replacing the
3323 operation with a user defined function call. */
3326 resolve_operator (gfc_expr *e)
3328 gfc_expr *op1, *op2;
3330 bool dual_locus_error;
3333 /* Resolve all subnodes-- give them types. */
3335 switch (e->value.op.op)
3338 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3341 /* Fall through... */
3344 case INTRINSIC_UPLUS:
3345 case INTRINSIC_UMINUS:
3346 case INTRINSIC_PARENTHESES:
3347 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3352 /* Typecheck the new node. */
3354 op1 = e->value.op.op1;
3355 op2 = e->value.op.op2;
3356 dual_locus_error = false;
3358 if ((op1 && op1->expr_type == EXPR_NULL)
3359 || (op2 && op2->expr_type == EXPR_NULL))
3361 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3365 switch (e->value.op.op)
3367 case INTRINSIC_UPLUS:
3368 case INTRINSIC_UMINUS:
3369 if (op1->ts.type == BT_INTEGER
3370 || op1->ts.type == BT_REAL
3371 || op1->ts.type == BT_COMPLEX)
3377 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3378 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3381 case INTRINSIC_PLUS:
3382 case INTRINSIC_MINUS:
3383 case INTRINSIC_TIMES:
3384 case INTRINSIC_DIVIDE:
3385 case INTRINSIC_POWER:
3386 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3388 gfc_type_convert_binary (e, 1);
3393 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3394 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3395 gfc_typename (&op2->ts));
3398 case INTRINSIC_CONCAT:
3399 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3400 && op1->ts.kind == op2->ts.kind)
3402 e->ts.type = BT_CHARACTER;
3403 e->ts.kind = op1->ts.kind;
3408 _("Operands of string concatenation operator at %%L are %s/%s"),
3409 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3415 case INTRINSIC_NEQV:
3416 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3418 e->ts.type = BT_LOGICAL;
3419 e->ts.kind = gfc_kind_max (op1, op2);
3420 if (op1->ts.kind < e->ts.kind)
3421 gfc_convert_type (op1, &e->ts, 2);
3422 else if (op2->ts.kind < e->ts.kind)
3423 gfc_convert_type (op2, &e->ts, 2);
3427 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3428 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3429 gfc_typename (&op2->ts));
3434 if (op1->ts.type == BT_LOGICAL)
3436 e->ts.type = BT_LOGICAL;
3437 e->ts.kind = op1->ts.kind;
3441 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3442 gfc_typename (&op1->ts));
3446 case INTRINSIC_GT_OS:
3448 case INTRINSIC_GE_OS:
3450 case INTRINSIC_LT_OS:
3452 case INTRINSIC_LE_OS:
3453 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3455 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3459 /* Fall through... */
3462 case INTRINSIC_EQ_OS:
3464 case INTRINSIC_NE_OS:
3465 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3466 && op1->ts.kind == op2->ts.kind)
3468 e->ts.type = BT_LOGICAL;
3469 e->ts.kind = gfc_default_logical_kind;
3473 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3475 gfc_type_convert_binary (e, 1);
3477 e->ts.type = BT_LOGICAL;
3478 e->ts.kind = gfc_default_logical_kind;
3482 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3484 _("Logicals at %%L must be compared with %s instead of %s"),
3485 (e->value.op.op == INTRINSIC_EQ
3486 || e->value.op.op == INTRINSIC_EQ_OS)
3487 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3490 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3491 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3492 gfc_typename (&op2->ts));
3496 case INTRINSIC_USER:
3497 if (e->value.op.uop->op == NULL)
3498 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3499 else if (op2 == NULL)
3500 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3501 e->value.op.uop->name, gfc_typename (&op1->ts));
3503 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3504 e->value.op.uop->name, gfc_typename (&op1->ts),
3505 gfc_typename (&op2->ts));
3509 case INTRINSIC_PARENTHESES:
3511 if (e->ts.type == BT_CHARACTER)
3512 e->ts.u.cl = op1->ts.u.cl;
3516 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3519 /* Deal with arrayness of an operand through an operator. */
3523 switch (e->value.op.op)
3525 case INTRINSIC_PLUS:
3526 case INTRINSIC_MINUS:
3527 case INTRINSIC_TIMES:
3528 case INTRINSIC_DIVIDE:
3529 case INTRINSIC_POWER:
3530 case INTRINSIC_CONCAT:
3534 case INTRINSIC_NEQV:
3536 case INTRINSIC_EQ_OS:
3538 case INTRINSIC_NE_OS:
3540 case INTRINSIC_GT_OS:
3542 case INTRINSIC_GE_OS:
3544 case INTRINSIC_LT_OS:
3546 case INTRINSIC_LE_OS:
3548 if (op1->rank == 0 && op2->rank == 0)
3551 if (op1->rank == 0 && op2->rank != 0)
3553 e->rank = op2->rank;
3555 if (e->shape == NULL)
3556 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3559 if (op1->rank != 0 && op2->rank == 0)
3561 e->rank = op1->rank;
3563 if (e->shape == NULL)
3564 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3567 if (op1->rank != 0 && op2->rank != 0)
3569 if (op1->rank == op2->rank)
3571 e->rank = op1->rank;
3572 if (e->shape == NULL)
3574 t = compare_shapes(op1, op2);
3578 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3583 /* Allow higher level expressions to work. */
3586 /* Try user-defined operators, and otherwise throw an error. */
3587 dual_locus_error = true;
3589 _("Inconsistent ranks for operator at %%L and %%L"));
3596 case INTRINSIC_PARENTHESES:
3598 case INTRINSIC_UPLUS:
3599 case INTRINSIC_UMINUS:
3600 /* Simply copy arrayness attribute */
3601 e->rank = op1->rank;
3603 if (e->shape == NULL)
3604 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3612 /* Attempt to simplify the expression. */
3615 t = gfc_simplify_expr (e, 0);
3616 /* Some calls do not succeed in simplification and return FAILURE
3617 even though there is no error; e.g. variable references to
3618 PARAMETER arrays. */
3619 if (!gfc_is_constant_expr (e))
3628 if (gfc_extend_expr (e, &real_error) == SUCCESS)
3635 if (dual_locus_error)
3636 gfc_error (msg, &op1->where, &op2->where);
3638 gfc_error (msg, &e->where);
3644 /************** Array resolution subroutines **************/
3647 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3650 /* Compare two integer expressions. */
3653 compare_bound (gfc_expr *a, gfc_expr *b)
3657 if (a == NULL || a->expr_type != EXPR_CONSTANT
3658 || b == NULL || b->expr_type != EXPR_CONSTANT)
3661 /* If either of the types isn't INTEGER, we must have
3662 raised an error earlier. */
3664 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3667 i = mpz_cmp (a->value.integer, b->value.integer);
3677 /* Compare an integer expression with an integer. */
3680 compare_bound_int (gfc_expr *a, int b)
3684 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3687 if (a->ts.type != BT_INTEGER)
3688 gfc_internal_error ("compare_bound_int(): Bad expression");
3690 i = mpz_cmp_si (a->value.integer, b);
3700 /* Compare an integer expression with a mpz_t. */
3703 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3707 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3710 if (a->ts.type != BT_INTEGER)
3711 gfc_internal_error ("compare_bound_int(): Bad expression");
3713 i = mpz_cmp (a->value.integer, b);
3723 /* Compute the last value of a sequence given by a triplet.
3724 Return 0 if it wasn't able to compute the last value, or if the
3725 sequence if empty, and 1 otherwise. */
3728 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3729 gfc_expr *stride, mpz_t last)
3733 if (start == NULL || start->expr_type != EXPR_CONSTANT
3734 || end == NULL || end->expr_type != EXPR_CONSTANT
3735 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3738 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3739 || (stride != NULL && stride->ts.type != BT_INTEGER))
3742 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3744 if (compare_bound (start, end) == CMP_GT)
3746 mpz_set (last, end->value.integer);
3750 if (compare_bound_int (stride, 0) == CMP_GT)
3752 /* Stride is positive */
3753 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3758 /* Stride is negative */
3759 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3764 mpz_sub (rem, end->value.integer, start->value.integer);
3765 mpz_tdiv_r (rem, rem, stride->value.integer);
3766 mpz_sub (last, end->value.integer, rem);
3773 /* Compare a single dimension of an array reference to the array
3777 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3781 if (ar->dimen_type[i] == DIMEN_STAR)
3783 gcc_assert (ar->stride[i] == NULL);
3784 /* This implies [*] as [*:] and [*:3] are not possible. */
3785 if (ar->start[i] == NULL)
3787 gcc_assert (ar->end[i] == NULL);
3792 /* Given start, end and stride values, calculate the minimum and
3793 maximum referenced indexes. */
3795 switch (ar->dimen_type[i])
3802 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3805 gfc_warning ("Array reference at %L is out of bounds "
3806 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3807 mpz_get_si (ar->start[i]->value.integer),
3808 mpz_get_si (as->lower[i]->value.integer), i+1);
3810 gfc_warning ("Array reference at %L is out of bounds "
3811 "(%ld < %ld) in codimension %d", &ar->c_where[i],
3812 mpz_get_si (ar->start[i]->value.integer),
3813 mpz_get_si (as->lower[i]->value.integer),
3817 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3820 gfc_warning ("Array reference at %L is out of bounds "
3821 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3822 mpz_get_si (ar->start[i]->value.integer),
3823 mpz_get_si (as->upper[i]->value.integer), i+1);
3825 gfc_warning ("Array reference at %L is out of bounds "
3826 "(%ld > %ld) in codimension %d", &ar->c_where[i],
3827 mpz_get_si (ar->start[i]->value.integer),
3828 mpz_get_si (as->upper[i]->value.integer),
3837 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3838 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3840 comparison comp_start_end = compare_bound (AR_START, AR_END);
3842 /* Check for zero stride, which is not allowed. */
3843 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3845 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3849 /* if start == len || (stride > 0 && start < len)
3850 || (stride < 0 && start > len),
3851 then the array section contains at least one element. In this
3852 case, there is an out-of-bounds access if
3853 (start < lower || start > upper). */
3854 if (compare_bound (AR_START, AR_END) == CMP_EQ
3855 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3856 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3857 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3858 && comp_start_end == CMP_GT))
3860 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3862 gfc_warning ("Lower array reference at %L is out of bounds "
3863 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3864 mpz_get_si (AR_START->value.integer),
3865 mpz_get_si (as->lower[i]->value.integer), i+1);
3868 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3870 gfc_warning ("Lower array reference at %L is out of bounds "
3871 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3872 mpz_get_si (AR_START->value.integer),
3873 mpz_get_si (as->upper[i]->value.integer), i+1);
3878 /* If we can compute the highest index of the array section,
3879 then it also has to be between lower and upper. */
3880 mpz_init (last_value);
3881 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3884 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3886 gfc_warning ("Upper array reference at %L is out of bounds "
3887 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3888 mpz_get_si (last_value),
3889 mpz_get_si (as->lower[i]->value.integer), i+1);
3890 mpz_clear (last_value);
3893 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3895 gfc_warning ("Upper array reference at %L is out of bounds "
3896 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3897 mpz_get_si (last_value),
3898 mpz_get_si (as->upper[i]->value.integer), i+1);
3899 mpz_clear (last_value);
3903 mpz_clear (last_value);
3911 gfc_internal_error ("check_dimension(): Bad array reference");
3918 /* Compare an array reference with an array specification. */
3921 compare_spec_to_ref (gfc_array_ref *ar)
3928 /* TODO: Full array sections are only allowed as actual parameters. */
3929 if (as->type == AS_ASSUMED_SIZE
3930 && (/*ar->type == AR_FULL
3931 ||*/ (ar->type == AR_SECTION
3932 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3934 gfc_error ("Rightmost upper bound of assumed size array section "
3935 "not specified at %L", &ar->where);
3939 if (ar->type == AR_FULL)
3942 if (as->rank != ar->dimen)
3944 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3945 &ar->where, ar->dimen, as->rank);
3949 /* ar->codimen == 0 is a local array. */
3950 if (as->corank != ar->codimen && ar->codimen != 0)
3952 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
3953 &ar->where, ar->codimen, as->corank);
3957 for (i = 0; i < as->rank; i++)
3958 if (check_dimension (i, ar, as) == FAILURE)
3961 /* Local access has no coarray spec. */
3962 if (ar->codimen != 0)
3963 for (i = as->rank; i < as->rank + as->corank; i++)
3965 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate)
3967 gfc_error ("Coindex of codimension %d must be a scalar at %L",
3968 i + 1 - as->rank, &ar->where);
3971 if (check_dimension (i, ar, as) == FAILURE)
3979 /* Resolve one part of an array index. */
3982 gfc_resolve_index (gfc_expr *index, int check_scalar)
3989 if (gfc_resolve_expr (index) == FAILURE)
3992 if (check_scalar && index->rank != 0)
3994 gfc_error ("Array index at %L must be scalar", &index->where);
3998 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4000 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4001 &index->where, gfc_basic_typename (index->ts.type));
4005 if (index->ts.type == BT_REAL)
4006 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4007 &index->where) == FAILURE)
4010 if (index->ts.kind != gfc_index_integer_kind
4011 || index->ts.type != BT_INTEGER)
4014 ts.type = BT_INTEGER;
4015 ts.kind = gfc_index_integer_kind;
4017 gfc_convert_type_warn (index, &ts, 2, 0);
4023 /* Resolve a dim argument to an intrinsic function. */
4026 gfc_resolve_dim_arg (gfc_expr *dim)
4031 if (gfc_resolve_expr (dim) == FAILURE)
4036 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4041 if (dim->ts.type != BT_INTEGER)
4043 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4047 if (dim->ts.kind != gfc_index_integer_kind)
4052 ts.type = BT_INTEGER;
4053 ts.kind = gfc_index_integer_kind;
4055 gfc_convert_type_warn (dim, &ts, 2, 0);
4061 /* Given an expression that contains array references, update those array
4062 references to point to the right array specifications. While this is
4063 filled in during matching, this information is difficult to save and load
4064 in a module, so we take care of it here.
4066 The idea here is that the original array reference comes from the
4067 base symbol. We traverse the list of reference structures, setting
4068 the stored reference to references. Component references can
4069 provide an additional array specification. */
4072 find_array_spec (gfc_expr *e)
4076 gfc_symbol *derived;
4079 if (e->symtree->n.sym->ts.type == BT_CLASS)
4080 as = e->symtree->n.sym->ts.u.derived->components->as;
4082 as = e->symtree->n.sym->as;
4085 for (ref = e->ref; ref; ref = ref->next)
4090 gfc_internal_error ("find_array_spec(): Missing spec");
4097 if (derived == NULL)
4098 derived = e->symtree->n.sym->ts.u.derived;
4100 if (derived->attr.is_class)
4101 derived = derived->components->ts.u.derived;
4103 c = derived->components;
4105 for (; c; c = c->next)
4106 if (c == ref->u.c.component)
4108 /* Track the sequence of component references. */
4109 if (c->ts.type == BT_DERIVED)
4110 derived = c->ts.u.derived;
4115 gfc_internal_error ("find_array_spec(): Component not found");
4117 if (c->attr.dimension)
4120 gfc_internal_error ("find_array_spec(): unused as(1)");
4131 gfc_internal_error ("find_array_spec(): unused as(2)");
4135 /* Resolve an array reference. */
4138 resolve_array_ref (gfc_array_ref *ar)
4140 int i, check_scalar;
4143 for (i = 0; i < ar->dimen + ar->codimen; i++)
4145 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4147 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
4149 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4151 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4156 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4160 ar->dimen_type[i] = DIMEN_ELEMENT;
4164 ar->dimen_type[i] = DIMEN_VECTOR;
4165 if (e->expr_type == EXPR_VARIABLE
4166 && e->symtree->n.sym->ts.type == BT_DERIVED)
4167 ar->start[i] = gfc_get_parentheses (e);
4171 gfc_error ("Array index at %L is an array of rank %d",
4172 &ar->c_where[i], e->rank);
4177 if (ar->type == AR_FULL && ar->as->rank == 0)
4178 ar->type = AR_ELEMENT;
4180 /* If the reference type is unknown, figure out what kind it is. */
4182 if (ar->type == AR_UNKNOWN)
4184 ar->type = AR_ELEMENT;
4185 for (i = 0; i < ar->dimen; i++)
4186 if (ar->dimen_type[i] == DIMEN_RANGE
4187 || ar->dimen_type[i] == DIMEN_VECTOR)
4189 ar->type = AR_SECTION;
4194 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4202 resolve_substring (gfc_ref *ref)
4204 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4206 if (ref->u.ss.start != NULL)
4208 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4211 if (ref->u.ss.start->ts.type != BT_INTEGER)
4213 gfc_error ("Substring start index at %L must be of type INTEGER",
4214 &ref->u.ss.start->where);
4218 if (ref->u.ss.start->rank != 0)
4220 gfc_error ("Substring start index at %L must be scalar",
4221 &ref->u.ss.start->where);
4225 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4226 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4227 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4229 gfc_error ("Substring start index at %L is less than one",
4230 &ref->u.ss.start->where);
4235 if (ref->u.ss.end != NULL)
4237 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4240 if (ref->u.ss.end->ts.type != BT_INTEGER)
4242 gfc_error ("Substring end index at %L must be of type INTEGER",
4243 &ref->u.ss.end->where);
4247 if (ref->u.ss.end->rank != 0)
4249 gfc_error ("Substring end index at %L must be scalar",
4250 &ref->u.ss.end->where);
4254 if (ref->u.ss.length != NULL
4255 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4256 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4257 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4259 gfc_error ("Substring end index at %L exceeds the string length",
4260 &ref->u.ss.start->where);
4264 if (compare_bound_mpz_t (ref->u.ss.end,
4265 gfc_integer_kinds[k].huge) == CMP_GT
4266 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4267 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4269 gfc_error ("Substring end index at %L is too large",
4270 &ref->u.ss.end->where);
4279 /* This function supplies missing substring charlens. */
4282 gfc_resolve_substring_charlen (gfc_expr *e)
4285 gfc_expr *start, *end;
4287 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4288 if (char_ref->type == REF_SUBSTRING)
4294 gcc_assert (char_ref->next == NULL);
4298 if (e->ts.u.cl->length)
4299 gfc_free_expr (e->ts.u.cl->length);
4300 else if (e->expr_type == EXPR_VARIABLE
4301 && e->symtree->n.sym->attr.dummy)
4305 e->ts.type = BT_CHARACTER;
4306 e->ts.kind = gfc_default_character_kind;
4309 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4311 if (char_ref->u.ss.start)
4312 start = gfc_copy_expr (char_ref->u.ss.start);
4314 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4316 if (char_ref->u.ss.end)
4317 end = gfc_copy_expr (char_ref->u.ss.end);
4318 else if (e->expr_type == EXPR_VARIABLE)
4319 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4326 /* Length = (end - start +1). */
4327 e->ts.u.cl->length = gfc_subtract (end, start);
4328 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4329 gfc_get_int_expr (gfc_default_integer_kind,
4332 e->ts.u.cl->length->ts.type = BT_INTEGER;
4333 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4335 /* Make sure that the length is simplified. */
4336 gfc_simplify_expr (e->ts.u.cl->length, 1);
4337 gfc_resolve_expr (e->ts.u.cl->length);
4341 /* Resolve subtype references. */
4344 resolve_ref (gfc_expr *expr)
4346 int current_part_dimension, n_components, seen_part_dimension;
4349 for (ref = expr->ref; ref; ref = ref->next)
4350 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4352 find_array_spec (expr);
4356 for (ref = expr->ref; ref; ref = ref->next)
4360 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4368 resolve_substring (ref);
4372 /* Check constraints on part references. */
4374 current_part_dimension = 0;
4375 seen_part_dimension = 0;
4378 for (ref = expr->ref; ref; ref = ref->next)
4383 switch (ref->u.ar.type)
4386 /* Coarray scalar. */
4387 if (ref->u.ar.as->rank == 0)
4389 current_part_dimension = 0;
4394 current_part_dimension = 1;
4398 current_part_dimension = 0;
4402 gfc_internal_error ("resolve_ref(): Bad array reference");
4408 if (current_part_dimension || seen_part_dimension)
4411 if (ref->u.c.component->attr.pointer
4412 || ref->u.c.component->attr.proc_pointer)
4414 gfc_error ("Component to the right of a part reference "
4415 "with nonzero rank must not have the POINTER "
4416 "attribute at %L", &expr->where);
4419 else if (ref->u.c.component->attr.allocatable)
4421 gfc_error ("Component to the right of a part reference "
4422 "with nonzero rank must not have the ALLOCATABLE "
4423 "attribute at %L", &expr->where);
4435 if (((ref->type == REF_COMPONENT && n_components > 1)
4436 || ref->next == NULL)
4437 && current_part_dimension
4438 && seen_part_dimension)
4440 gfc_error ("Two or more part references with nonzero rank must "
4441 "not be specified at %L", &expr->where);
4445 if (ref->type == REF_COMPONENT)
4447 if (current_part_dimension)
4448 seen_part_dimension = 1;
4450 /* reset to make sure */
4451 current_part_dimension = 0;
4459 /* Given an expression, determine its shape. This is easier than it sounds.
4460 Leaves the shape array NULL if it is not possible to determine the shape. */
4463 expression_shape (gfc_expr *e)
4465 mpz_t array[GFC_MAX_DIMENSIONS];
4468 if (e->rank == 0 || e->shape != NULL)
4471 for (i = 0; i < e->rank; i++)
4472 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4475 e->shape = gfc_get_shape (e->rank);
4477 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4482 for (i--; i >= 0; i--)
4483 mpz_clear (array[i]);
4487 /* Given a variable expression node, compute the rank of the expression by
4488 examining the base symbol and any reference structures it may have. */
4491 expression_rank (gfc_expr *e)
4496 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4497 could lead to serious confusion... */
4498 gcc_assert (e->expr_type != EXPR_COMPCALL);
4502 if (e->expr_type == EXPR_ARRAY)
4504 /* Constructors can have a rank different from one via RESHAPE(). */
4506 if (e->symtree == NULL)
4512 e->rank = (e->symtree->n.sym->as == NULL)
4513 ? 0 : e->symtree->n.sym->as->rank;
4519 for (ref = e->ref; ref; ref = ref->next)
4521 if (ref->type != REF_ARRAY)
4524 if (ref->u.ar.type == AR_FULL)
4526 rank = ref->u.ar.as->rank;
4530 if (ref->u.ar.type == AR_SECTION)
4532 /* Figure out the rank of the section. */
4534 gfc_internal_error ("expression_rank(): Two array specs");
4536 for (i = 0; i < ref->u.ar.dimen; i++)
4537 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4538 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4548 expression_shape (e);
4552 /* Resolve a variable expression. */
4555 resolve_variable (gfc_expr *e)
4562 if (e->symtree == NULL)
4565 if (e->ref && resolve_ref (e) == FAILURE)
4568 sym = e->symtree->n.sym;
4569 if (sym->attr.flavor == FL_PROCEDURE
4570 && (!sym->attr.function
4571 || (sym->attr.function && sym->result
4572 && sym->result->attr.proc_pointer
4573 && !sym->result->attr.function)))
4575 e->ts.type = BT_PROCEDURE;
4576 goto resolve_procedure;
4579 if (sym->ts.type != BT_UNKNOWN)
4580 gfc_variable_attr (e, &e->ts);
4583 /* Must be a simple variable reference. */
4584 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4589 if (check_assumed_size_reference (sym, e))
4592 /* Deal with forward references to entries during resolve_code, to
4593 satisfy, at least partially, 12.5.2.5. */
4594 if (gfc_current_ns->entries
4595 && current_entry_id == sym->entry_id
4598 && cs_base->current->op != EXEC_ENTRY)
4600 gfc_entry_list *entry;
4601 gfc_formal_arglist *formal;
4605 /* If the symbol is a dummy... */
4606 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4608 entry = gfc_current_ns->entries;
4611 /* ...test if the symbol is a parameter of previous entries. */
4612 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4613 for (formal = entry->sym->formal; formal; formal = formal->next)
4615 if (formal->sym && sym->name == formal->sym->name)
4619 /* If it has not been seen as a dummy, this is an error. */
4622 if (specification_expr)
4623 gfc_error ("Variable '%s', used in a specification expression"
4624 ", is referenced at %L before the ENTRY statement "
4625 "in which it is a parameter",
4626 sym->name, &cs_base->current->loc);
4628 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4629 "statement in which it is a parameter",
4630 sym->name, &cs_base->current->loc);
4635 /* Now do the same check on the specification expressions. */
4636 specification_expr = 1;
4637 if (sym->ts.type == BT_CHARACTER
4638 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4642 for (n = 0; n < sym->as->rank; n++)
4644 specification_expr = 1;
4645 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4647 specification_expr = 1;
4648 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4651 specification_expr = 0;
4654 /* Update the symbol's entry level. */
4655 sym->entry_id = current_entry_id + 1;
4659 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4662 /* F2008, C617 and C1229. */
4663 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
4664 && gfc_is_coindexed (e))
4666 gfc_ref *ref, *ref2 = NULL;
4668 if (e->ts.type == BT_CLASS)
4670 gfc_error ("Polymorphic subobject of coindexed object at %L",
4675 for (ref = e->ref; ref; ref = ref->next)
4677 if (ref->type == REF_COMPONENT)
4679 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
4683 for ( ; ref; ref = ref->next)
4684 if (ref->type == REF_COMPONENT)
4687 /* Expression itself is coindexed object. */
4691 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
4692 for ( ; c; c = c->next)
4693 if (c->attr.allocatable && c->ts.type == BT_CLASS)
4695 gfc_error ("Coindexed object with polymorphic allocatable "
4696 "subcomponent at %L", &e->where);
4707 /* Checks to see that the correct symbol has been host associated.
4708 The only situation where this arises is that in which a twice
4709 contained function is parsed after the host association is made.
4710 Therefore, on detecting this, change the symbol in the expression
4711 and convert the array reference into an actual arglist if the old
4712 symbol is a variable. */
4714 check_host_association (gfc_expr *e)
4716 gfc_symbol *sym, *old_sym;
4720 gfc_actual_arglist *arg, *tail = NULL;
4721 bool retval = e->expr_type == EXPR_FUNCTION;
4723 /* If the expression is the result of substitution in
4724 interface.c(gfc_extend_expr) because there is no way in
4725 which the host association can be wrong. */
4726 if (e->symtree == NULL
4727 || e->symtree->n.sym == NULL
4728 || e->user_operator)
4731 old_sym = e->symtree->n.sym;
4733 if (gfc_current_ns->parent
4734 && old_sym->ns != gfc_current_ns)
4736 /* Use the 'USE' name so that renamed module symbols are
4737 correctly handled. */
4738 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4740 if (sym && old_sym != sym
4741 && sym->ts.type == old_sym->ts.type
4742 && sym->attr.flavor == FL_PROCEDURE
4743 && sym->attr.contained)
4745 /* Clear the shape, since it might not be valid. */
4746 if (e->shape != NULL)
4748 for (n = 0; n < e->rank; n++)
4749 mpz_clear (e->shape[n]);
4751 gfc_free (e->shape);
4754 /* Give the expression the right symtree! */
4755 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4756 gcc_assert (st != NULL);
4758 if (old_sym->attr.flavor == FL_PROCEDURE
4759 || e->expr_type == EXPR_FUNCTION)
4761 /* Original was function so point to the new symbol, since
4762 the actual argument list is already attached to the
4764 e->value.function.esym = NULL;
4769 /* Original was variable so convert array references into
4770 an actual arglist. This does not need any checking now
4771 since gfc_resolve_function will take care of it. */
4772 e->value.function.actual = NULL;
4773 e->expr_type = EXPR_FUNCTION;
4776 /* Ambiguity will not arise if the array reference is not
4777 the last reference. */
4778 for (ref = e->ref; ref; ref = ref->next)
4779 if (ref->type == REF_ARRAY && ref->next == NULL)
4782 gcc_assert (ref->type == REF_ARRAY);
4784 /* Grab the start expressions from the array ref and
4785 copy them into actual arguments. */
4786 for (n = 0; n < ref->u.ar.dimen; n++)
4788 arg = gfc_get_actual_arglist ();
4789 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4790 if (e->value.function.actual == NULL)
4791 tail = e->value.function.actual = arg;
4799 /* Dump the reference list and set the rank. */
4800 gfc_free_ref_list (e->ref);
4802 e->rank = sym->as ? sym->as->rank : 0;
4805 gfc_resolve_expr (e);
4809 /* This might have changed! */
4810 return e->expr_type == EXPR_FUNCTION;
4815 gfc_resolve_character_operator (gfc_expr *e)
4817 gfc_expr *op1 = e->value.op.op1;
4818 gfc_expr *op2 = e->value.op.op2;
4819 gfc_expr *e1 = NULL;
4820 gfc_expr *e2 = NULL;
4822 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4824 if (op1->ts.u.cl && op1->ts.u.cl->length)
4825 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4826 else if (op1->expr_type == EXPR_CONSTANT)
4827 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4828 op1->value.character.length);
4830 if (op2->ts.u.cl && op2->ts.u.cl->length)
4831 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4832 else if (op2->expr_type == EXPR_CONSTANT)
4833 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4834 op2->value.character.length);
4836 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4841 e->ts.u.cl->length = gfc_add (e1, e2);
4842 e->ts.u.cl->length->ts.type = BT_INTEGER;
4843 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4844 gfc_simplify_expr (e->ts.u.cl->length, 0);
4845 gfc_resolve_expr (e->ts.u.cl->length);
4851 /* Ensure that an character expression has a charlen and, if possible, a
4852 length expression. */
4855 fixup_charlen (gfc_expr *e)
4857 /* The cases fall through so that changes in expression type and the need
4858 for multiple fixes are picked up. In all circumstances, a charlen should
4859 be available for the middle end to hang a backend_decl on. */
4860 switch (e->expr_type)
4863 gfc_resolve_character_operator (e);
4866 if (e->expr_type == EXPR_ARRAY)
4867 gfc_resolve_character_array_constructor (e);
4869 case EXPR_SUBSTRING:
4870 if (!e->ts.u.cl && e->ref)
4871 gfc_resolve_substring_charlen (e);
4875 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4882 /* Update an actual argument to include the passed-object for type-bound
4883 procedures at the right position. */
4885 static gfc_actual_arglist*
4886 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
4889 gcc_assert (argpos > 0);
4893 gfc_actual_arglist* result;
4895 result = gfc_get_actual_arglist ();
4899 result->name = name;
4905 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
4907 lst = update_arglist_pass (NULL, po, argpos - 1, name);
4912 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4915 extract_compcall_passed_object (gfc_expr* e)
4919 gcc_assert (e->expr_type == EXPR_COMPCALL);
4921 if (e->value.compcall.base_object)
4922 po = gfc_copy_expr (e->value.compcall.base_object);
4925 po = gfc_get_expr ();
4926 po->expr_type = EXPR_VARIABLE;
4927 po->symtree = e->symtree;
4928 po->ref = gfc_copy_ref (e->ref);
4929 po->where = e->where;
4932 if (gfc_resolve_expr (po) == FAILURE)
4939 /* Update the arglist of an EXPR_COMPCALL expression to include the
4943 update_compcall_arglist (gfc_expr* e)
4946 gfc_typebound_proc* tbp;
4948 tbp = e->value.compcall.tbp;
4953 po = extract_compcall_passed_object (e);
4957 if (tbp->nopass || e->value.compcall.ignore_pass)
4963 gcc_assert (tbp->pass_arg_num > 0);
4964 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4972 /* Extract the passed object from a PPC call (a copy of it). */
4975 extract_ppc_passed_object (gfc_expr *e)
4980 po = gfc_get_expr ();
4981 po->expr_type = EXPR_VARIABLE;
4982 po->symtree = e->symtree;
4983 po->ref = gfc_copy_ref (e->ref);
4984 po->where = e->where;
4986 /* Remove PPC reference. */
4988 while ((*ref)->next)
4989 ref = &(*ref)->next;
4990 gfc_free_ref_list (*ref);
4993 if (gfc_resolve_expr (po) == FAILURE)
5000 /* Update the actual arglist of a procedure pointer component to include the
5004 update_ppc_arglist (gfc_expr* e)
5008 gfc_typebound_proc* tb;
5010 if (!gfc_is_proc_ptr_comp (e, &ppc))
5017 else if (tb->nopass)
5020 po = extract_ppc_passed_object (e);
5026 gfc_error ("Passed-object at %L must be scalar", &e->where);
5030 gcc_assert (tb->pass_arg_num > 0);
5031 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5039 /* Check that the object a TBP is called on is valid, i.e. it must not be
5040 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5043 check_typebound_baseobject (gfc_expr* e)
5047 base = extract_compcall_passed_object (e);
5051 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5053 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5055 gfc_error ("Base object for type-bound procedure call at %L is of"
5056 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5060 /* If the procedure called is NOPASS, the base object must be scalar. */
5061 if (e->value.compcall.tbp->nopass && base->rank > 0)
5063 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5064 " be scalar", &e->where);
5068 /* FIXME: Remove once PR 41177 (this problem) is fixed completely. */
5071 gfc_error ("Non-scalar base object at %L currently not implemented",
5080 /* Resolve a call to a type-bound procedure, either function or subroutine,
5081 statically from the data in an EXPR_COMPCALL expression. The adapted
5082 arglist and the target-procedure symtree are returned. */
5085 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5086 gfc_actual_arglist** actual)
5088 gcc_assert (e->expr_type == EXPR_COMPCALL);
5089 gcc_assert (!e->value.compcall.tbp->is_generic);
5091 /* Update the actual arglist for PASS. */
5092 if (update_compcall_arglist (e) == FAILURE)
5095 *actual = e->value.compcall.actual;
5096 *target = e->value.compcall.tbp->u.specific;
5098 gfc_free_ref_list (e->ref);
5100 e->value.compcall.actual = NULL;
5106 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5107 which of the specific bindings (if any) matches the arglist and transform
5108 the expression into a call of that binding. */
5111 resolve_typebound_generic_call (gfc_expr* e)
5113 gfc_typebound_proc* genproc;
5114 const char* genname;
5116 gcc_assert (e->expr_type == EXPR_COMPCALL);
5117 genname = e->value.compcall.name;
5118 genproc = e->value.compcall.tbp;
5120 if (!genproc->is_generic)
5123 /* Try the bindings on this type and in the inheritance hierarchy. */
5124 for (; genproc; genproc = genproc->overridden)
5128 gcc_assert (genproc->is_generic);
5129 for (g = genproc->u.generic; g; g = g->next)
5132 gfc_actual_arglist* args;
5135 gcc_assert (g->specific);
5137 if (g->specific->error)
5140 target = g->specific->u.specific->n.sym;
5142 /* Get the right arglist by handling PASS/NOPASS. */
5143 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5144 if (!g->specific->nopass)
5147 po = extract_compcall_passed_object (e);
5151 gcc_assert (g->specific->pass_arg_num > 0);
5152 gcc_assert (!g->specific->error);
5153 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5154 g->specific->pass_arg);
5156 resolve_actual_arglist (args, target->attr.proc,
5157 is_external_proc (target) && !target->formal);
5159 /* Check if this arglist matches the formal. */
5160 matches = gfc_arglist_matches_symbol (&args, target);
5162 /* Clean up and break out of the loop if we've found it. */
5163 gfc_free_actual_arglist (args);
5166 e->value.compcall.tbp = g->specific;
5172 /* Nothing matching found! */
5173 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5174 " '%s' at %L", genname, &e->where);
5182 /* Resolve a call to a type-bound subroutine. */
5185 resolve_typebound_call (gfc_code* c)
5187 gfc_actual_arglist* newactual;
5188 gfc_symtree* target;
5190 /* Check that's really a SUBROUTINE. */
5191 if (!c->expr1->value.compcall.tbp->subroutine)
5193 gfc_error ("'%s' at %L should be a SUBROUTINE",
5194 c->expr1->value.compcall.name, &c->loc);
5198 if (check_typebound_baseobject (c->expr1) == FAILURE)
5201 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
5204 /* Transform into an ordinary EXEC_CALL for now. */
5206 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5209 c->ext.actual = newactual;
5210 c->symtree = target;
5211 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5213 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5215 gfc_free_expr (c->expr1);
5216 c->expr1 = gfc_get_expr ();
5217 c->expr1->expr_type = EXPR_FUNCTION;
5218 c->expr1->symtree = target;
5219 c->expr1->where = c->loc;
5221 return resolve_call (c);
5225 /* Resolve a component-call expression. This originally was intended
5226 only to see functions. However, it is convenient to use it in
5227 resolving subroutine class methods, since we do not have to add a
5228 gfc_code each time. */
5230 resolve_compcall (gfc_expr* e, bool fcn, bool class_members)
5232 gfc_actual_arglist* newactual;
5233 gfc_symtree* target;
5235 /* Check that's really a FUNCTION. */
5236 if (fcn && !e->value.compcall.tbp->function)
5238 gfc_error ("'%s' at %L should be a FUNCTION",
5239 e->value.compcall.name, &e->where);
5242 else if (!fcn && !e->value.compcall.tbp->subroutine)
5244 /* To resolve class member calls, we borrow this bit
5245 of code to select the specific procedures. */
5246 gfc_error ("'%s' at %L should be a SUBROUTINE",
5247 e->value.compcall.name, &e->where);
5251 /* These must not be assign-calls! */
5252 gcc_assert (!e->value.compcall.assign);
5254 if (check_typebound_baseobject (e) == FAILURE)
5257 if (resolve_typebound_generic_call (e) == FAILURE)
5259 gcc_assert (!e->value.compcall.tbp->is_generic);
5261 /* Take the rank from the function's symbol. */
5262 if (e->value.compcall.tbp->u.specific->n.sym->as)
5263 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5265 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5266 arglist to the TBP's binding target. */
5268 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5271 e->value.function.actual = newactual;
5272 e->value.function.name = NULL;
5273 e->value.function.esym = target->n.sym;
5274 e->value.function.class_esym = NULL;
5275 e->value.function.isym = NULL;
5276 e->symtree = target;
5277 e->ts = target->n.sym->ts;
5278 e->expr_type = EXPR_FUNCTION;
5280 /* Resolution is not necessary when constructing component calls
5281 for class members, since this must only be done for the
5282 declared type, which is done afterwards. */
5283 return !class_members ? gfc_resolve_expr (e) : SUCCESS;
5287 /* Resolve a typebound call for the members in a class. This group of
5288 functions implements dynamic dispatch in the provisional version
5289 of f03 OOP. As soon as vtables are in place and contain pointers
5290 to methods, this will no longer be necessary. */
5291 static gfc_expr *list_e;
5292 static gfc_try check_class_members (gfc_symbol *);
5293 static gfc_try class_try;
5294 static bool fcn_flag;
5298 check_members (gfc_symbol *derived)
5300 if (derived->attr.flavor == FL_DERIVED)
5301 (void) check_class_members (derived);
5306 check_class_members (gfc_symbol *derived)
5310 gfc_class_esym_list *etmp;
5312 e = gfc_copy_expr (list_e);
5314 tbp = gfc_find_typebound_proc (derived, &class_try,
5315 e->value.compcall.name,
5320 gfc_error ("no typebound available procedure named '%s' at %L",
5321 e->value.compcall.name, &e->where);
5325 /* If we have to match a passed class member, force the actual
5326 expression to have the correct type. */
5327 if (!tbp->n.tb->nopass)
5329 if (e->value.compcall.base_object == NULL)
5330 e->value.compcall.base_object = extract_compcall_passed_object (e);
5332 if (e->value.compcall.base_object == NULL)
5335 if (!derived->attr.abstract)
5337 e->value.compcall.base_object->ts.type = BT_DERIVED;
5338 e->value.compcall.base_object->ts.u.derived = derived;
5342 e->value.compcall.tbp = tbp->n.tb;
5343 e->value.compcall.name = tbp->name;
5345 /* Let the original expresssion catch the assertion in
5346 resolve_compcall, since this flag does not appear to be reset or
5347 copied in some systems. */
5348 e->value.compcall.assign = 0;
5350 /* Do the renaming, PASSing, generic => specific and other
5351 good things for each class member. */
5352 class_try = (resolve_compcall (e, fcn_flag, true) == SUCCESS)
5353 ? class_try : FAILURE;
5355 /* Now transfer the found symbol to the esym list. */
5356 if (class_try == SUCCESS)
5358 etmp = list_e->value.function.class_esym;
5359 list_e->value.function.class_esym
5360 = gfc_get_class_esym_list();
5361 list_e->value.function.class_esym->next = etmp;
5362 list_e->value.function.class_esym->derived = derived;
5363 list_e->value.function.class_esym->esym
5364 = e->value.function.esym;
5369 /* Burrow down into grandchildren types. */
5370 if (derived->f2k_derived)
5371 gfc_traverse_ns (derived->f2k_derived, check_members);
5377 /* Eliminate esym_lists where all the members point to the
5378 typebound procedure of the declared type; ie. one where
5379 type selection has no effect.. */
5381 resolve_class_esym (gfc_expr *e)
5383 gfc_class_esym_list *p, *q;
5386 gcc_assert (e && e->expr_type == EXPR_FUNCTION);
5388 p = e->value.function.class_esym;
5392 for (; p; p = p->next)
5393 empty = empty && (e->value.function.esym == p->esym);
5397 p = e->value.function.class_esym;
5403 e->value.function.class_esym = NULL;
5408 /* Generate an expression for the hash value, given the reference to
5409 the class of the final expression (class_ref), the base of the
5410 full reference list (new_ref), the declared type and the class
5413 hash_value_expr (gfc_ref *class_ref, gfc_ref *new_ref, gfc_symtree *st)
5415 gfc_expr *hash_value;
5417 /* Build an expression for the correct hash_value; ie. that of the last
5421 class_ref->next = NULL;
5425 gfc_free_ref_list (new_ref);
5428 hash_value = gfc_get_expr ();
5429 hash_value->expr_type = EXPR_VARIABLE;
5430 hash_value->symtree = st;
5431 hash_value->symtree->n.sym->refs++;
5432 hash_value->ref = new_ref;
5433 gfc_add_component_ref (hash_value, "$vptr");
5434 gfc_add_component_ref (hash_value, "$hash");
5440 /* Get the ultimate declared type from an expression. In addition,
5441 return the last class/derived type reference and the copy of the
5444 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5447 gfc_symbol *declared;
5452 *new_ref = gfc_copy_ref (e->ref);
5453 for (ref = *new_ref; ref; ref = ref->next)
5455 if (ref->type != REF_COMPONENT)
5458 if (ref->u.c.component->ts.type == BT_CLASS
5459 || ref->u.c.component->ts.type == BT_DERIVED)
5461 declared = ref->u.c.component->ts.u.derived;
5466 if (declared == NULL)
5467 declared = e->symtree->n.sym->ts.u.derived;
5473 /* Resolve the argument expressions so that any arguments expressions
5474 that include class methods are resolved before the current call.
5475 This is necessary because of the static variables used in CLASS
5476 method resolution. */
5478 resolve_arg_exprs (gfc_actual_arglist *arg)
5480 /* Resolve the actual arglist expressions. */
5481 for (; arg; arg = arg->next)
5484 gfc_resolve_expr (arg->expr);
5489 /* Resolve a typebound function, or 'method'. First separate all
5490 the non-CLASS references by calling resolve_compcall directly.
5491 Then treat the CLASS references by resolving for each of the class
5495 resolve_typebound_function (gfc_expr* e)
5497 gfc_symbol *derived, *declared;
5504 return resolve_compcall (e, true, false);
5506 /* Get the CLASS declared type. */
5507 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5509 /* Weed out cases of the ultimate component being a derived type. */
5510 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5511 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5513 gfc_free_ref_list (new_ref);
5514 return resolve_compcall (e, true, false);
5517 /* Resolve the argument expressions, */
5518 resolve_arg_exprs (e->value.function.actual);
5520 /* Get the data component, which is of the declared type. */
5521 derived = declared->components->ts.u.derived;
5523 /* Resolve the function call for each member of the class. */
5524 class_try = SUCCESS;
5526 list_e = gfc_copy_expr (e);
5528 if (check_class_members (derived) == FAILURE)
5531 class_try = (resolve_compcall (e, true, false) == SUCCESS)
5532 ? class_try : FAILURE;
5534 /* Transfer the class list to the original expression. Note that
5535 the class_esym list is cleaned up in trans-expr.c, as the calls
5537 e->value.function.class_esym = list_e->value.function.class_esym;
5538 list_e->value.function.class_esym = NULL;
5539 gfc_free_expr (list_e);
5541 resolve_class_esym (e);
5543 /* More than one typebound procedure so transmit an expression for
5544 the hash_value as the selector. */
5545 if (e->value.function.class_esym != NULL)
5546 e->value.function.class_esym->hash_value
5547 = hash_value_expr (class_ref, new_ref, st);
5552 /* Resolve a typebound subroutine, or 'method'. First separate all
5553 the non-CLASS references by calling resolve_typebound_call directly.
5554 Then treat the CLASS references by resolving for each of the class
5558 resolve_typebound_subroutine (gfc_code *code)
5560 gfc_symbol *derived, *declared;
5565 st = code->expr1->symtree;
5567 return resolve_typebound_call (code);
5569 /* Get the CLASS declared type. */
5570 declared = get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5572 /* Weed out cases of the ultimate component being a derived type. */
5573 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5574 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5576 gfc_free_ref_list (new_ref);
5577 return resolve_typebound_call (code);
5580 /* Resolve the argument expressions, */
5581 resolve_arg_exprs (code->expr1->value.compcall.actual);
5583 /* Get the data component, which is of the declared type. */
5584 derived = declared->components->ts.u.derived;
5586 class_try = SUCCESS;
5588 list_e = gfc_copy_expr (code->expr1);
5590 if (check_class_members (derived) == FAILURE)
5593 class_try = (resolve_typebound_call (code) == SUCCESS)
5594 ? class_try : FAILURE;
5596 /* Transfer the class list to the original expression. Note that
5597 the class_esym list is cleaned up in trans-expr.c, as the calls
5599 code->expr1->value.function.class_esym
5600 = list_e->value.function.class_esym;
5601 list_e->value.function.class_esym = NULL;
5602 gfc_free_expr (list_e);
5604 resolve_class_esym (code->expr1);
5606 /* More than one typebound procedure so transmit an expression for
5607 the hash_value as the selector. */
5608 if (code->expr1->value.function.class_esym != NULL)
5609 code->expr1->value.function.class_esym->hash_value
5610 = hash_value_expr (class_ref, new_ref, st);
5616 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5619 resolve_ppc_call (gfc_code* c)
5621 gfc_component *comp;
5624 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5627 c->resolved_sym = c->expr1->symtree->n.sym;
5628 c->expr1->expr_type = EXPR_VARIABLE;
5630 if (!comp->attr.subroutine)
5631 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5633 if (resolve_ref (c->expr1) == FAILURE)
5636 if (update_ppc_arglist (c->expr1) == FAILURE)
5639 c->ext.actual = c->expr1->value.compcall.actual;
5641 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5642 comp->formal == NULL) == FAILURE)
5645 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5651 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5654 resolve_expr_ppc (gfc_expr* e)
5656 gfc_component *comp;
5659 b = gfc_is_proc_ptr_comp (e, &comp);
5662 /* Convert to EXPR_FUNCTION. */
5663 e->expr_type = EXPR_FUNCTION;
5664 e->value.function.isym = NULL;
5665 e->value.function.actual = e->value.compcall.actual;
5667 if (comp->as != NULL)
5668 e->rank = comp->as->rank;
5670 if (!comp->attr.function)
5671 gfc_add_function (&comp->attr, comp->name, &e->where);
5673 if (resolve_ref (e) == FAILURE)
5676 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5677 comp->formal == NULL) == FAILURE)
5680 if (update_ppc_arglist (e) == FAILURE)
5683 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5690 gfc_is_expandable_expr (gfc_expr *e)
5692 gfc_constructor *con;
5694 if (e->expr_type == EXPR_ARRAY)
5696 /* Traverse the constructor looking for variables that are flavor
5697 parameter. Parameters must be expanded since they are fully used at
5699 con = gfc_constructor_first (e->value.constructor);
5700 for (; con; con = gfc_constructor_next (con))
5702 if (con->expr->expr_type == EXPR_VARIABLE
5703 && con->expr->symtree
5704 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
5705 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
5707 if (con->expr->expr_type == EXPR_ARRAY
5708 && gfc_is_expandable_expr (con->expr))
5716 /* Resolve an expression. That is, make sure that types of operands agree
5717 with their operators, intrinsic operators are converted to function calls
5718 for overloaded types and unresolved function references are resolved. */
5721 gfc_resolve_expr (gfc_expr *e)
5729 /* inquiry_argument only applies to variables. */
5730 inquiry_save = inquiry_argument;
5731 if (e->expr_type != EXPR_VARIABLE)
5732 inquiry_argument = false;
5734 switch (e->expr_type)
5737 t = resolve_operator (e);
5743 if (check_host_association (e))
5744 t = resolve_function (e);
5747 t = resolve_variable (e);
5749 expression_rank (e);
5752 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5753 && e->ref->type != REF_SUBSTRING)
5754 gfc_resolve_substring_charlen (e);
5759 t = resolve_typebound_function (e);
5762 case EXPR_SUBSTRING:
5763 t = resolve_ref (e);
5772 t = resolve_expr_ppc (e);
5777 if (resolve_ref (e) == FAILURE)
5780 t = gfc_resolve_array_constructor (e);
5781 /* Also try to expand a constructor. */
5784 expression_rank (e);
5785 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
5786 gfc_expand_constructor (e);
5789 /* This provides the opportunity for the length of constructors with
5790 character valued function elements to propagate the string length
5791 to the expression. */
5792 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5794 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
5795 here rather then add a duplicate test for it above. */
5796 gfc_expand_constructor (e);
5797 t = gfc_resolve_character_array_constructor (e);
5802 case EXPR_STRUCTURE:
5803 t = resolve_ref (e);
5807 t = resolve_structure_cons (e);
5811 t = gfc_simplify_expr (e, 0);
5815 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5818 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5821 inquiry_argument = inquiry_save;
5827 /* Resolve an expression from an iterator. They must be scalar and have
5828 INTEGER or (optionally) REAL type. */
5831 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5832 const char *name_msgid)
5834 if (gfc_resolve_expr (expr) == FAILURE)
5837 if (expr->rank != 0)
5839 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5843 if (expr->ts.type != BT_INTEGER)
5845 if (expr->ts.type == BT_REAL)
5848 return gfc_notify_std (GFC_STD_F95_DEL,
5849 "Deleted feature: %s at %L must be integer",
5850 _(name_msgid), &expr->where);
5853 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5860 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5868 /* Resolve the expressions in an iterator structure. If REAL_OK is
5869 false allow only INTEGER type iterators, otherwise allow REAL types. */
5872 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5874 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5878 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5880 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5885 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5886 "Start expression in DO loop") == FAILURE)
5889 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5890 "End expression in DO loop") == FAILURE)
5893 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5894 "Step expression in DO loop") == FAILURE)
5897 if (iter->step->expr_type == EXPR_CONSTANT)
5899 if ((iter->step->ts.type == BT_INTEGER
5900 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5901 || (iter->step->ts.type == BT_REAL
5902 && mpfr_sgn (iter->step->value.real) == 0))
5904 gfc_error ("Step expression in DO loop at %L cannot be zero",
5905 &iter->step->where);
5910 /* Convert start, end, and step to the same type as var. */
5911 if (iter->start->ts.kind != iter->var->ts.kind
5912 || iter->start->ts.type != iter->var->ts.type)
5913 gfc_convert_type (iter->start, &iter->var->ts, 2);
5915 if (iter->end->ts.kind != iter->var->ts.kind
5916 || iter->end->ts.type != iter->var->ts.type)
5917 gfc_convert_type (iter->end, &iter->var->ts, 2);
5919 if (iter->step->ts.kind != iter->var->ts.kind
5920 || iter->step->ts.type != iter->var->ts.type)
5921 gfc_convert_type (iter->step, &iter->var->ts, 2);
5923 if (iter->start->expr_type == EXPR_CONSTANT
5924 && iter->end->expr_type == EXPR_CONSTANT
5925 && iter->step->expr_type == EXPR_CONSTANT)
5928 if (iter->start->ts.type == BT_INTEGER)
5930 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5931 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5935 sgn = mpfr_sgn (iter->step->value.real);
5936 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5938 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5939 gfc_warning ("DO loop at %L will be executed zero times",
5940 &iter->step->where);
5947 /* Traversal function for find_forall_index. f == 2 signals that
5948 that variable itself is not to be checked - only the references. */
5951 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5953 if (expr->expr_type != EXPR_VARIABLE)
5956 /* A scalar assignment */
5957 if (!expr->ref || *f == 1)
5959 if (expr->symtree->n.sym == sym)
5971 /* Check whether the FORALL index appears in the expression or not.
5972 Returns SUCCESS if SYM is found in EXPR. */
5975 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5977 if (gfc_traverse_expr (expr, sym, forall_index, f))
5984 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5985 to be a scalar INTEGER variable. The subscripts and stride are scalar
5986 INTEGERs, and if stride is a constant it must be nonzero.
5987 Furthermore "A subscript or stride in a forall-triplet-spec shall
5988 not contain a reference to any index-name in the
5989 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5992 resolve_forall_iterators (gfc_forall_iterator *it)
5994 gfc_forall_iterator *iter, *iter2;
5996 for (iter = it; iter; iter = iter->next)
5998 if (gfc_resolve_expr (iter->var) == SUCCESS
5999 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
6000 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
6003 if (gfc_resolve_expr (iter->start) == SUCCESS
6004 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
6005 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
6006 &iter->start->where);
6007 if (iter->var->ts.kind != iter->start->ts.kind)
6008 gfc_convert_type (iter->start, &iter->var->ts, 2);
6010 if (gfc_resolve_expr (iter->end) == SUCCESS
6011 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
6012 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
6014 if (iter->var->ts.kind != iter->end->ts.kind)
6015 gfc_convert_type (iter->end, &iter->var->ts, 2);
6017 if (gfc_resolve_expr (iter->stride) == SUCCESS)
6019 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
6020 gfc_error ("FORALL stride expression at %L must be a scalar %s",
6021 &iter->stride->where, "INTEGER");
6023 if (iter->stride->expr_type == EXPR_CONSTANT
6024 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
6025 gfc_error ("FORALL stride expression at %L cannot be zero",
6026 &iter->stride->where);
6028 if (iter->var->ts.kind != iter->stride->ts.kind)
6029 gfc_convert_type (iter->stride, &iter->var->ts, 2);
6032 for (iter = it; iter; iter = iter->next)
6033 for (iter2 = iter; iter2; iter2 = iter2->next)
6035 if (find_forall_index (iter2->start,
6036 iter->var->symtree->n.sym, 0) == SUCCESS
6037 || find_forall_index (iter2->end,
6038 iter->var->symtree->n.sym, 0) == SUCCESS
6039 || find_forall_index (iter2->stride,
6040 iter->var->symtree->n.sym, 0) == SUCCESS)
6041 gfc_error ("FORALL index '%s' may not appear in triplet "
6042 "specification at %L", iter->var->symtree->name,
6043 &iter2->start->where);
6048 /* Given a pointer to a symbol that is a derived type, see if it's
6049 inaccessible, i.e. if it's defined in another module and the components are
6050 PRIVATE. The search is recursive if necessary. Returns zero if no
6051 inaccessible components are found, nonzero otherwise. */
6054 derived_inaccessible (gfc_symbol *sym)
6058 if (sym->attr.use_assoc && sym->attr.private_comp)
6061 for (c = sym->components; c; c = c->next)
6063 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
6071 /* Resolve the argument of a deallocate expression. The expression must be
6072 a pointer or a full array. */
6075 resolve_deallocate_expr (gfc_expr *e)
6077 symbol_attribute attr;
6078 int allocatable, pointer, check_intent_in;
6083 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6084 check_intent_in = 1;
6086 if (gfc_resolve_expr (e) == FAILURE)
6089 if (e->expr_type != EXPR_VARIABLE)
6092 sym = e->symtree->n.sym;
6094 if (sym->ts.type == BT_CLASS)
6096 allocatable = sym->ts.u.derived->components->attr.allocatable;
6097 pointer = sym->ts.u.derived->components->attr.pointer;
6101 allocatable = sym->attr.allocatable;
6102 pointer = sym->attr.pointer;
6104 for (ref = e->ref; ref; ref = ref->next)
6107 check_intent_in = 0;
6112 if (ref->u.ar.type != AR_FULL)
6117 c = ref->u.c.component;
6118 if (c->ts.type == BT_CLASS)
6120 allocatable = c->ts.u.derived->components->attr.allocatable;
6121 pointer = c->ts.u.derived->components->attr.pointer;
6125 allocatable = c->attr.allocatable;
6126 pointer = c->attr.pointer;
6136 attr = gfc_expr_attr (e);
6138 if (allocatable == 0 && attr.pointer == 0)
6141 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6145 if (check_intent_in && sym->attr.intent == INTENT_IN)
6147 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
6148 sym->name, &e->where);
6152 if (e->ts.type == BT_CLASS)
6154 /* Only deallocate the DATA component. */
6155 gfc_add_component_ref (e, "$data");
6162 /* Returns true if the expression e contains a reference to the symbol sym. */
6164 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6166 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6173 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6175 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6179 /* Given the expression node e for an allocatable/pointer of derived type to be
6180 allocated, get the expression node to be initialized afterwards (needed for
6181 derived types with default initializers, and derived types with allocatable
6182 components that need nullification.) */
6185 gfc_expr_to_initialize (gfc_expr *e)
6191 result = gfc_copy_expr (e);
6193 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6194 for (ref = result->ref; ref; ref = ref->next)
6195 if (ref->type == REF_ARRAY && ref->next == NULL)
6197 ref->u.ar.type = AR_FULL;
6199 for (i = 0; i < ref->u.ar.dimen; i++)
6200 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6202 result->rank = ref->u.ar.dimen;
6210 /* Used in resolve_allocate_expr to check that a allocation-object and
6211 a source-expr are conformable. This does not catch all possible
6212 cases; in particular a runtime checking is needed. */
6215 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6217 /* First compare rank. */
6218 if (e2->ref && e1->rank != e2->ref->u.ar.as->rank)
6220 gfc_error ("Source-expr at %L must be scalar or have the "
6221 "same rank as the allocate-object at %L",
6222 &e1->where, &e2->where);
6233 for (i = 0; i < e1->rank; i++)
6235 if (e2->ref->u.ar.end[i])
6237 mpz_set (s, e2->ref->u.ar.end[i]->value.integer);
6238 mpz_sub (s, s, e2->ref->u.ar.start[i]->value.integer);
6239 mpz_add_ui (s, s, 1);
6243 mpz_set (s, e2->ref->u.ar.start[i]->value.integer);
6246 if (mpz_cmp (e1->shape[i], s) != 0)
6248 gfc_error ("Source-expr at %L and allocate-object at %L must "
6249 "have the same shape", &e1->where, &e2->where);
6262 /* Resolve the expression in an ALLOCATE statement, doing the additional
6263 checks to see whether the expression is OK or not. The expression must
6264 have a trailing array reference that gives the size of the array. */
6267 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6269 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6271 symbol_attribute attr;
6272 gfc_ref *ref, *ref2;
6279 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6280 check_intent_in = 1;
6282 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6283 checking of coarrays. */
6284 for (ref = e->ref; ref; ref = ref->next)
6285 if (ref->next == NULL)
6288 if (ref && ref->type == REF_ARRAY)
6289 ref->u.ar.in_allocate = true;
6291 if (gfc_resolve_expr (e) == FAILURE)
6294 /* Make sure the expression is allocatable or a pointer. If it is
6295 pointer, the next-to-last reference must be a pointer. */
6299 sym = e->symtree->n.sym;
6301 /* Check whether ultimate component is abstract and CLASS. */
6304 if (e->expr_type != EXPR_VARIABLE)
6307 attr = gfc_expr_attr (e);
6308 pointer = attr.pointer;
6309 dimension = attr.dimension;
6310 codimension = attr.codimension;
6314 if (sym->ts.type == BT_CLASS)
6316 allocatable = sym->ts.u.derived->components->attr.allocatable;
6317 pointer = sym->ts.u.derived->components->attr.pointer;
6318 dimension = sym->ts.u.derived->components->attr.dimension;
6319 codimension = sym->ts.u.derived->components->attr.codimension;
6320 is_abstract = sym->ts.u.derived->components->attr.abstract;
6324 allocatable = sym->attr.allocatable;
6325 pointer = sym->attr.pointer;
6326 dimension = sym->attr.dimension;
6327 codimension = sym->attr.codimension;
6330 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6333 check_intent_in = 0;
6338 if (ref->next != NULL)
6344 if (gfc_is_coindexed (e))
6346 gfc_error ("Coindexed allocatable object at %L",
6351 c = ref->u.c.component;
6352 if (c->ts.type == BT_CLASS)
6354 allocatable = c->ts.u.derived->components->attr.allocatable;
6355 pointer = c->ts.u.derived->components->attr.pointer;
6356 dimension = c->ts.u.derived->components->attr.dimension;
6357 codimension = c->ts.u.derived->components->attr.codimension;
6358 is_abstract = c->ts.u.derived->components->attr.abstract;
6362 allocatable = c->attr.allocatable;
6363 pointer = c->attr.pointer;
6364 dimension = c->attr.dimension;
6365 codimension = c->attr.codimension;
6366 is_abstract = c->attr.abstract;
6378 if (allocatable == 0 && pointer == 0)
6380 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6385 /* Some checks for the SOURCE tag. */
6388 /* Check F03:C631. */
6389 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6391 gfc_error ("Type of entity at %L is type incompatible with "
6392 "source-expr at %L", &e->where, &code->expr3->where);
6396 /* Check F03:C632 and restriction following Note 6.18. */
6397 if (code->expr3->rank > 0
6398 && conformable_arrays (code->expr3, e) == FAILURE)
6401 /* Check F03:C633. */
6402 if (code->expr3->ts.kind != e->ts.kind)
6404 gfc_error ("The allocate-object at %L and the source-expr at %L "
6405 "shall have the same kind type parameter",
6406 &e->where, &code->expr3->where);
6410 else if (is_abstract&& code->ext.alloc.ts.type == BT_UNKNOWN)
6412 gcc_assert (e->ts.type == BT_CLASS);
6413 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6414 "type-spec or SOURCE=", sym->name, &e->where);
6418 if (check_intent_in && sym->attr.intent == INTENT_IN)
6420 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6421 sym->name, &e->where);
6427 /* Add default initializer for those derived types that need them. */
6428 if (e->ts.type == BT_DERIVED
6429 && (init_e = gfc_default_initializer (&e->ts)))
6431 gfc_code *init_st = gfc_get_code ();
6432 init_st->loc = code->loc;
6433 init_st->op = EXEC_INIT_ASSIGN;
6434 init_st->expr1 = gfc_expr_to_initialize (e);
6435 init_st->expr2 = init_e;
6436 init_st->next = code->next;
6437 code->next = init_st;
6439 else if (e->ts.type == BT_CLASS
6440 && ((code->ext.alloc.ts.type == BT_UNKNOWN
6441 && (init_e = gfc_default_initializer (&e->ts.u.derived->components->ts)))
6442 || (code->ext.alloc.ts.type == BT_DERIVED
6443 && (init_e = gfc_default_initializer (&code->ext.alloc.ts)))))
6445 gfc_code *init_st = gfc_get_code ();
6446 init_st->loc = code->loc;
6447 init_st->op = EXEC_INIT_ASSIGN;
6448 init_st->expr1 = gfc_expr_to_initialize (e);
6449 init_st->expr2 = init_e;
6450 init_st->next = code->next;
6451 code->next = init_st;
6455 if (pointer || (dimension == 0 && codimension == 0))
6458 /* Make sure the next-to-last reference node is an array specification. */
6460 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6461 || (dimension && ref2->u.ar.dimen == 0))
6463 gfc_error ("Array specification required in ALLOCATE statement "
6464 "at %L", &e->where);
6468 /* Make sure that the array section reference makes sense in the
6469 context of an ALLOCATE specification. */
6473 if (codimension && ar->codimen == 0)
6475 gfc_error ("Coarray specification required in ALLOCATE statement "
6476 "at %L", &e->where);
6480 for (i = 0; i < ar->dimen; i++)
6482 if (ref2->u.ar.type == AR_ELEMENT)
6485 switch (ar->dimen_type[i])
6491 if (ar->start[i] != NULL
6492 && ar->end[i] != NULL
6493 && ar->stride[i] == NULL)
6496 /* Fall Through... */
6501 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6507 for (a = code->ext.alloc.list; a; a = a->next)
6509 sym = a->expr->symtree->n.sym;
6511 /* TODO - check derived type components. */
6512 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6515 if ((ar->start[i] != NULL
6516 && gfc_find_sym_in_expr (sym, ar->start[i]))
6517 || (ar->end[i] != NULL
6518 && gfc_find_sym_in_expr (sym, ar->end[i])))
6520 gfc_error ("'%s' must not appear in the array specification at "
6521 "%L in the same ALLOCATE statement where it is "
6522 "itself allocated", sym->name, &ar->where);
6528 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6530 if (ar->dimen_type[i] == DIMEN_ELEMENT
6531 || ar->dimen_type[i] == DIMEN_RANGE)
6533 if (i == (ar->dimen + ar->codimen - 1))
6535 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6536 "statement at %L", &e->where);
6542 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6543 && ar->stride[i] == NULL)
6546 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6553 gfc_error ("Sorry, allocatable coarrays are no yet supported coarray "
6554 "at %L", &e->where);
6566 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6568 gfc_expr *stat, *errmsg, *pe, *qe;
6569 gfc_alloc *a, *p, *q;
6571 stat = code->expr1 ? code->expr1 : NULL;
6573 errmsg = code->expr2 ? code->expr2 : NULL;
6575 /* Check the stat variable. */
6578 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6579 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6580 stat->symtree->n.sym->name, &stat->where);
6582 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6583 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6586 if ((stat->ts.type != BT_INTEGER
6587 && !(stat->ref && (stat->ref->type == REF_ARRAY
6588 || stat->ref->type == REF_COMPONENT)))
6590 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6591 "variable", &stat->where);
6593 for (p = code->ext.alloc.list; p; p = p->next)
6594 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6595 gfc_error ("Stat-variable at %L shall not be %sd within "
6596 "the same %s statement", &stat->where, fcn, fcn);
6599 /* Check the errmsg variable. */
6603 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6606 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6607 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6608 errmsg->symtree->n.sym->name, &errmsg->where);
6610 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6611 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6614 if ((errmsg->ts.type != BT_CHARACTER
6616 && (errmsg->ref->type == REF_ARRAY
6617 || errmsg->ref->type == REF_COMPONENT)))
6618 || errmsg->rank > 0 )
6619 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6620 "variable", &errmsg->where);
6622 for (p = code->ext.alloc.list; p; p = p->next)
6623 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6624 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6625 "the same %s statement", &errmsg->where, fcn, fcn);
6628 /* Check that an allocate-object appears only once in the statement.
6629 FIXME: Checking derived types is disabled. */
6630 for (p = code->ext.alloc.list; p; p = p->next)
6633 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6634 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6636 for (q = p->next; q; q = q->next)
6639 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6640 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6641 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6642 gfc_error ("Allocate-object at %L also appears at %L",
6643 &pe->where, &qe->where);
6648 if (strcmp (fcn, "ALLOCATE") == 0)
6650 for (a = code->ext.alloc.list; a; a = a->next)
6651 resolve_allocate_expr (a->expr, code);
6655 for (a = code->ext.alloc.list; a; a = a->next)
6656 resolve_deallocate_expr (a->expr);
6661 /************ SELECT CASE resolution subroutines ************/
6663 /* Callback function for our mergesort variant. Determines interval
6664 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6665 op1 > op2. Assumes we're not dealing with the default case.
6666 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6667 There are nine situations to check. */
6670 compare_cases (const gfc_case *op1, const gfc_case *op2)
6674 if (op1->low == NULL) /* op1 = (:L) */
6676 /* op2 = (:N), so overlap. */
6678 /* op2 = (M:) or (M:N), L < M */
6679 if (op2->low != NULL
6680 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6683 else if (op1->high == NULL) /* op1 = (K:) */
6685 /* op2 = (M:), so overlap. */
6687 /* op2 = (:N) or (M:N), K > N */
6688 if (op2->high != NULL
6689 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6692 else /* op1 = (K:L) */
6694 if (op2->low == NULL) /* op2 = (:N), K > N */
6695 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6697 else if (op2->high == NULL) /* op2 = (M:), L < M */
6698 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6700 else /* op2 = (M:N) */
6704 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6707 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6716 /* Merge-sort a double linked case list, detecting overlap in the
6717 process. LIST is the head of the double linked case list before it
6718 is sorted. Returns the head of the sorted list if we don't see any
6719 overlap, or NULL otherwise. */
6722 check_case_overlap (gfc_case *list)
6724 gfc_case *p, *q, *e, *tail;
6725 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6727 /* If the passed list was empty, return immediately. */
6734 /* Loop unconditionally. The only exit from this loop is a return
6735 statement, when we've finished sorting the case list. */
6742 /* Count the number of merges we do in this pass. */
6745 /* Loop while there exists a merge to be done. */
6750 /* Count this merge. */
6753 /* Cut the list in two pieces by stepping INSIZE places
6754 forward in the list, starting from P. */
6757 for (i = 0; i < insize; i++)
6766 /* Now we have two lists. Merge them! */
6767 while (psize > 0 || (qsize > 0 && q != NULL))
6769 /* See from which the next case to merge comes from. */
6772 /* P is empty so the next case must come from Q. */
6777 else if (qsize == 0 || q == NULL)
6786 cmp = compare_cases (p, q);
6789 /* The whole case range for P is less than the
6797 /* The whole case range for Q is greater than
6798 the case range for P. */
6805 /* The cases overlap, or they are the same
6806 element in the list. Either way, we must
6807 issue an error and get the next case from P. */
6808 /* FIXME: Sort P and Q by line number. */
6809 gfc_error ("CASE label at %L overlaps with CASE "
6810 "label at %L", &p->where, &q->where);
6818 /* Add the next element to the merged list. */
6827 /* P has now stepped INSIZE places along, and so has Q. So
6828 they're the same. */
6833 /* If we have done only one merge or none at all, we've
6834 finished sorting the cases. */
6843 /* Otherwise repeat, merging lists twice the size. */
6849 /* Check to see if an expression is suitable for use in a CASE statement.
6850 Makes sure that all case expressions are scalar constants of the same
6851 type. Return FAILURE if anything is wrong. */
6854 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6856 if (e == NULL) return SUCCESS;
6858 if (e->ts.type != case_expr->ts.type)
6860 gfc_error ("Expression in CASE statement at %L must be of type %s",
6861 &e->where, gfc_basic_typename (case_expr->ts.type));
6865 /* C805 (R808) For a given case-construct, each case-value shall be of
6866 the same type as case-expr. For character type, length differences
6867 are allowed, but the kind type parameters shall be the same. */
6869 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6871 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6872 &e->where, case_expr->ts.kind);
6876 /* Convert the case value kind to that of case expression kind, if needed.
6877 FIXME: Should a warning be issued? */
6878 if (e->ts.kind != case_expr->ts.kind)
6879 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6883 gfc_error ("Expression in CASE statement at %L must be scalar",
6892 /* Given a completely parsed select statement, we:
6894 - Validate all expressions and code within the SELECT.
6895 - Make sure that the selection expression is not of the wrong type.
6896 - Make sure that no case ranges overlap.
6897 - Eliminate unreachable cases and unreachable code resulting from
6898 removing case labels.
6900 The standard does allow unreachable cases, e.g. CASE (5:3). But
6901 they are a hassle for code generation, and to prevent that, we just
6902 cut them out here. This is not necessary for overlapping cases
6903 because they are illegal and we never even try to generate code.
6905 We have the additional caveat that a SELECT construct could have
6906 been a computed GOTO in the source code. Fortunately we can fairly
6907 easily work around that here: The case_expr for a "real" SELECT CASE
6908 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6909 we have to do is make sure that the case_expr is a scalar integer
6913 resolve_select (gfc_code *code)
6916 gfc_expr *case_expr;
6917 gfc_case *cp, *default_case, *tail, *head;
6918 int seen_unreachable;
6924 if (code->expr1 == NULL)
6926 /* This was actually a computed GOTO statement. */
6927 case_expr = code->expr2;
6928 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6929 gfc_error ("Selection expression in computed GOTO statement "
6930 "at %L must be a scalar integer expression",
6933 /* Further checking is not necessary because this SELECT was built
6934 by the compiler, so it should always be OK. Just move the
6935 case_expr from expr2 to expr so that we can handle computed
6936 GOTOs as normal SELECTs from here on. */
6937 code->expr1 = code->expr2;
6942 case_expr = code->expr1;
6944 type = case_expr->ts.type;
6945 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6947 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6948 &case_expr->where, gfc_typename (&case_expr->ts));
6950 /* Punt. Going on here just produce more garbage error messages. */
6954 if (case_expr->rank != 0)
6956 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6957 "expression", &case_expr->where);
6963 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6964 of the SELECT CASE expression and its CASE values. Walk the lists
6965 of case values, and if we find a mismatch, promote case_expr to
6966 the appropriate kind. */
6968 if (type == BT_LOGICAL || type == BT_INTEGER)
6970 for (body = code->block; body; body = body->block)
6972 /* Walk the case label list. */
6973 for (cp = body->ext.case_list; cp; cp = cp->next)
6975 /* Intercept the DEFAULT case. It does not have a kind. */
6976 if (cp->low == NULL && cp->high == NULL)
6979 /* Unreachable case ranges are discarded, so ignore. */
6980 if (cp->low != NULL && cp->high != NULL
6981 && cp->low != cp->high
6982 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6985 /* FIXME: Should a warning be issued? */
6987 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6988 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6990 if (cp->high != NULL
6991 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6992 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6997 /* Assume there is no DEFAULT case. */
6998 default_case = NULL;
7003 for (body = code->block; body; body = body->block)
7005 /* Assume the CASE list is OK, and all CASE labels can be matched. */
7007 seen_unreachable = 0;
7009 /* Walk the case label list, making sure that all case labels
7011 for (cp = body->ext.case_list; cp; cp = cp->next)
7013 /* Count the number of cases in the whole construct. */
7016 /* Intercept the DEFAULT case. */
7017 if (cp->low == NULL && cp->high == NULL)
7019 if (default_case != NULL)
7021 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7022 "by a second DEFAULT CASE at %L",
7023 &default_case->where, &cp->where);
7034 /* Deal with single value cases and case ranges. Errors are
7035 issued from the validation function. */
7036 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
7037 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7043 if (type == BT_LOGICAL
7044 && ((cp->low == NULL || cp->high == NULL)
7045 || cp->low != cp->high))
7047 gfc_error ("Logical range in CASE statement at %L is not "
7048 "allowed", &cp->low->where);
7053 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7056 value = cp->low->value.logical == 0 ? 2 : 1;
7057 if (value & seen_logical)
7059 gfc_error ("constant logical value in CASE statement "
7060 "is repeated at %L",
7065 seen_logical |= value;
7068 if (cp->low != NULL && cp->high != NULL
7069 && cp->low != cp->high
7070 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7072 if (gfc_option.warn_surprising)
7073 gfc_warning ("Range specification at %L can never "
7074 "be matched", &cp->where);
7076 cp->unreachable = 1;
7077 seen_unreachable = 1;
7081 /* If the case range can be matched, it can also overlap with
7082 other cases. To make sure it does not, we put it in a
7083 double linked list here. We sort that with a merge sort
7084 later on to detect any overlapping cases. */
7088 head->right = head->left = NULL;
7093 tail->right->left = tail;
7100 /* It there was a failure in the previous case label, give up
7101 for this case label list. Continue with the next block. */
7105 /* See if any case labels that are unreachable have been seen.
7106 If so, we eliminate them. This is a bit of a kludge because
7107 the case lists for a single case statement (label) is a
7108 single forward linked lists. */
7109 if (seen_unreachable)
7111 /* Advance until the first case in the list is reachable. */
7112 while (body->ext.case_list != NULL
7113 && body->ext.case_list->unreachable)
7115 gfc_case *n = body->ext.case_list;
7116 body->ext.case_list = body->ext.case_list->next;
7118 gfc_free_case_list (n);
7121 /* Strip all other unreachable cases. */
7122 if (body->ext.case_list)
7124 for (cp = body->ext.case_list; cp->next; cp = cp->next)
7126 if (cp->next->unreachable)
7128 gfc_case *n = cp->next;
7129 cp->next = cp->next->next;
7131 gfc_free_case_list (n);
7138 /* See if there were overlapping cases. If the check returns NULL,
7139 there was overlap. In that case we don't do anything. If head
7140 is non-NULL, we prepend the DEFAULT case. The sorted list can
7141 then used during code generation for SELECT CASE constructs with
7142 a case expression of a CHARACTER type. */
7145 head = check_case_overlap (head);
7147 /* Prepend the default_case if it is there. */
7148 if (head != NULL && default_case)
7150 default_case->left = NULL;
7151 default_case->right = head;
7152 head->left = default_case;
7156 /* Eliminate dead blocks that may be the result if we've seen
7157 unreachable case labels for a block. */
7158 for (body = code; body && body->block; body = body->block)
7160 if (body->block->ext.case_list == NULL)
7162 /* Cut the unreachable block from the code chain. */
7163 gfc_code *c = body->block;
7164 body->block = c->block;
7166 /* Kill the dead block, but not the blocks below it. */
7168 gfc_free_statements (c);
7172 /* More than two cases is legal but insane for logical selects.
7173 Issue a warning for it. */
7174 if (gfc_option.warn_surprising && type == BT_LOGICAL
7176 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7181 /* Check if a derived type is extensible. */
7184 gfc_type_is_extensible (gfc_symbol *sym)
7186 return !(sym->attr.is_bind_c || sym->attr.sequence);
7190 /* Resolve a SELECT TYPE statement. */
7193 resolve_select_type (gfc_code *code)
7195 gfc_symbol *selector_type;
7196 gfc_code *body, *new_st, *if_st, *tail;
7197 gfc_code *class_is = NULL, *default_case = NULL;
7200 char name[GFC_MAX_SYMBOL_LEN];
7208 selector_type = code->expr2->ts.u.derived->components->ts.u.derived;
7210 selector_type = code->expr1->ts.u.derived->components->ts.u.derived;
7212 /* Loop over TYPE IS / CLASS IS cases. */
7213 for (body = code->block; body; body = body->block)
7215 c = body->ext.case_list;
7217 /* Check F03:C815. */
7218 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7219 && !gfc_type_is_extensible (c->ts.u.derived))
7221 gfc_error ("Derived type '%s' at %L must be extensible",
7222 c->ts.u.derived->name, &c->where);
7227 /* Check F03:C816. */
7228 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7229 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7231 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7232 c->ts.u.derived->name, &c->where, selector_type->name);
7237 /* Intercept the DEFAULT case. */
7238 if (c->ts.type == BT_UNKNOWN)
7240 /* Check F03:C818. */
7243 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7244 "by a second DEFAULT CASE at %L",
7245 &default_case->ext.case_list->where, &c->where);
7250 default_case = body;
7259 /* Insert assignment for selector variable. */
7260 new_st = gfc_get_code ();
7261 new_st->op = EXEC_ASSIGN;
7262 new_st->expr1 = gfc_copy_expr (code->expr1);
7263 new_st->expr2 = gfc_copy_expr (code->expr2);
7267 /* Put SELECT TYPE statement inside a BLOCK. */
7268 new_st = gfc_get_code ();
7269 new_st->op = code->op;
7270 new_st->expr1 = code->expr1;
7271 new_st->expr2 = code->expr2;
7272 new_st->block = code->block;
7276 ns->code->next = new_st;
7277 code->op = EXEC_BLOCK;
7278 code->expr1 = code->expr2 = NULL;
7283 /* Transform to EXEC_SELECT. */
7284 code->op = EXEC_SELECT;
7285 gfc_add_component_ref (code->expr1, "$vptr");
7286 gfc_add_component_ref (code->expr1, "$hash");
7288 /* Loop over TYPE IS / CLASS IS cases. */
7289 for (body = code->block; body; body = body->block)
7291 c = body->ext.case_list;
7293 if (c->ts.type == BT_DERIVED)
7294 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7295 c->ts.u.derived->hash_value);
7297 else if (c->ts.type == BT_UNKNOWN)
7300 /* Assign temporary to selector. */
7301 if (c->ts.type == BT_CLASS)
7302 sprintf (name, "tmp$class$%s", c->ts.u.derived->name);
7304 sprintf (name, "tmp$type$%s", c->ts.u.derived->name);
7305 st = gfc_find_symtree (ns->sym_root, name);
7306 new_st = gfc_get_code ();
7307 new_st->expr1 = gfc_get_variable_expr (st);
7308 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
7309 if (c->ts.type == BT_DERIVED)
7311 new_st->op = EXEC_POINTER_ASSIGN;
7312 gfc_add_component_ref (new_st->expr2, "$data");
7315 new_st->op = EXEC_POINTER_ASSIGN;
7316 new_st->next = body->next;
7317 body->next = new_st;
7320 /* Take out CLASS IS cases for separate treatment. */
7322 while (body && body->block)
7324 if (body->block->ext.case_list->ts.type == BT_CLASS)
7326 /* Add to class_is list. */
7327 if (class_is == NULL)
7329 class_is = body->block;
7334 for (tail = class_is; tail->block; tail = tail->block) ;
7335 tail->block = body->block;
7338 /* Remove from EXEC_SELECT list. */
7339 body->block = body->block->block;
7352 /* Add a default case to hold the CLASS IS cases. */
7353 for (tail = code; tail->block; tail = tail->block) ;
7354 tail->block = gfc_get_code ();
7356 tail->op = EXEC_SELECT_TYPE;
7357 tail->ext.case_list = gfc_get_case ();
7358 tail->ext.case_list->ts.type = BT_UNKNOWN;
7360 default_case = tail;
7363 /* More than one CLASS IS block? */
7364 if (class_is->block)
7368 /* Sort CLASS IS blocks by extension level. */
7372 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7375 /* F03:C817 (check for doubles). */
7376 if ((*c1)->ext.case_list->ts.u.derived->hash_value
7377 == c2->ext.case_list->ts.u.derived->hash_value)
7379 gfc_error ("Double CLASS IS block in SELECT TYPE "
7380 "statement at %L", &c2->ext.case_list->where);
7383 if ((*c1)->ext.case_list->ts.u.derived->attr.extension
7384 < c2->ext.case_list->ts.u.derived->attr.extension)
7387 (*c1)->block = c2->block;
7397 /* Generate IF chain. */
7398 if_st = gfc_get_code ();
7399 if_st->op = EXEC_IF;
7401 for (body = class_is; body; body = body->block)
7403 new_st->block = gfc_get_code ();
7404 new_st = new_st->block;
7405 new_st->op = EXEC_IF;
7406 /* Set up IF condition: Call _gfortran_is_extension_of. */
7407 new_st->expr1 = gfc_get_expr ();
7408 new_st->expr1->expr_type = EXPR_FUNCTION;
7409 new_st->expr1->ts.type = BT_LOGICAL;
7410 new_st->expr1->ts.kind = 4;
7411 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
7412 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
7413 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
7414 /* Set up arguments. */
7415 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
7416 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
7417 gfc_add_component_ref (new_st->expr1->value.function.actual->expr, "$vptr");
7418 vtab = gfc_find_derived_vtab (body->ext.case_list->ts.u.derived);
7419 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
7420 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
7421 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
7422 new_st->next = body->next;
7424 if (default_case->next)
7426 new_st->block = gfc_get_code ();
7427 new_st = new_st->block;
7428 new_st->op = EXEC_IF;
7429 new_st->next = default_case->next;
7432 /* Replace CLASS DEFAULT code by the IF chain. */
7433 default_case->next = if_st;
7436 resolve_select (code);
7441 /* Resolve a transfer statement. This is making sure that:
7442 -- a derived type being transferred has only non-pointer components
7443 -- a derived type being transferred doesn't have private components, unless
7444 it's being transferred from the module where the type was defined
7445 -- we're not trying to transfer a whole assumed size array. */
7448 resolve_transfer (gfc_code *code)
7457 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
7460 sym = exp->symtree->n.sym;
7463 /* Go to actual component transferred. */
7464 for (ref = code->expr1->ref; ref; ref = ref->next)
7465 if (ref->type == REF_COMPONENT)
7466 ts = &ref->u.c.component->ts;
7468 if (ts->type == BT_DERIVED)
7470 /* Check that transferred derived type doesn't contain POINTER
7472 if (ts->u.derived->attr.pointer_comp)
7474 gfc_error ("Data transfer element at %L cannot have "
7475 "POINTER components", &code->loc);
7479 if (ts->u.derived->attr.alloc_comp)
7481 gfc_error ("Data transfer element at %L cannot have "
7482 "ALLOCATABLE components", &code->loc);
7486 if (derived_inaccessible (ts->u.derived))
7488 gfc_error ("Data transfer element at %L cannot have "
7489 "PRIVATE components",&code->loc);
7494 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7495 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7497 gfc_error ("Data transfer element at %L cannot be a full reference to "
7498 "an assumed-size array", &code->loc);
7504 /*********** Toplevel code resolution subroutines ***********/
7506 /* Find the set of labels that are reachable from this block. We also
7507 record the last statement in each block. */
7510 find_reachable_labels (gfc_code *block)
7517 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7519 /* Collect labels in this block. We don't keep those corresponding
7520 to END {IF|SELECT}, these are checked in resolve_branch by going
7521 up through the code_stack. */
7522 for (c = block; c; c = c->next)
7524 if (c->here && c->op != EXEC_END_BLOCK)
7525 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7528 /* Merge with labels from parent block. */
7531 gcc_assert (cs_base->prev->reachable_labels);
7532 bitmap_ior_into (cs_base->reachable_labels,
7533 cs_base->prev->reachable_labels);
7539 resolve_sync (gfc_code *code)
7541 /* Check imageset. The * case matches expr1 == NULL. */
7544 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
7545 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
7546 "INTEGER expression", &code->expr1->where);
7547 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
7548 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
7549 gfc_error ("Imageset argument at %L must between 1 and num_images()",
7550 &code->expr1->where);
7551 else if (code->expr1->expr_type == EXPR_ARRAY
7552 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
7554 gfc_constructor *cons;
7555 cons = gfc_constructor_first (code->expr1->value.constructor);
7556 for (; cons; cons = gfc_constructor_next (cons))
7557 if (cons->expr->expr_type == EXPR_CONSTANT
7558 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
7559 gfc_error ("Imageset argument at %L must between 1 and "
7560 "num_images()", &cons->expr->where);
7566 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
7567 || code->expr2->expr_type != EXPR_VARIABLE))
7568 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
7569 &code->expr2->where);
7573 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
7574 || code->expr3->expr_type != EXPR_VARIABLE))
7575 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
7576 &code->expr3->where);
7580 /* Given a branch to a label, see if the branch is conforming.
7581 The code node describes where the branch is located. */
7584 resolve_branch (gfc_st_label *label, gfc_code *code)
7591 /* Step one: is this a valid branching target? */
7593 if (label->defined == ST_LABEL_UNKNOWN)
7595 gfc_error ("Label %d referenced at %L is never defined", label->value,
7600 if (label->defined != ST_LABEL_TARGET)
7602 gfc_error ("Statement at %L is not a valid branch target statement "
7603 "for the branch statement at %L", &label->where, &code->loc);
7607 /* Step two: make sure this branch is not a branch to itself ;-) */
7609 if (code->here == label)
7611 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7615 /* Step three: See if the label is in the same block as the
7616 branching statement. The hard work has been done by setting up
7617 the bitmap reachable_labels. */
7619 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7621 /* Check now whether there is a CRITICAL construct; if so, check
7622 whether the label is still visible outside of the CRITICAL block,
7623 which is invalid. */
7624 for (stack = cs_base; stack; stack = stack->prev)
7625 if (stack->current->op == EXEC_CRITICAL
7626 && bitmap_bit_p (stack->reachable_labels, label->value))
7627 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7628 " at %L", &code->loc, &label->where);
7633 /* Step four: If we haven't found the label in the bitmap, it may
7634 still be the label of the END of the enclosing block, in which
7635 case we find it by going up the code_stack. */
7637 for (stack = cs_base; stack; stack = stack->prev)
7639 if (stack->current->next && stack->current->next->here == label)
7641 if (stack->current->op == EXEC_CRITICAL)
7643 /* Note: A label at END CRITICAL does not leave the CRITICAL
7644 construct as END CRITICAL is still part of it. */
7645 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7646 " at %L", &code->loc, &label->where);
7653 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7657 /* The label is not in an enclosing block, so illegal. This was
7658 allowed in Fortran 66, so we allow it as extension. No
7659 further checks are necessary in this case. */
7660 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7661 "as the GOTO statement at %L", &label->where,
7667 /* Check whether EXPR1 has the same shape as EXPR2. */
7670 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7672 mpz_t shape[GFC_MAX_DIMENSIONS];
7673 mpz_t shape2[GFC_MAX_DIMENSIONS];
7674 gfc_try result = FAILURE;
7677 /* Compare the rank. */
7678 if (expr1->rank != expr2->rank)
7681 /* Compare the size of each dimension. */
7682 for (i=0; i<expr1->rank; i++)
7684 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7687 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7690 if (mpz_cmp (shape[i], shape2[i]))
7694 /* When either of the two expression is an assumed size array, we
7695 ignore the comparison of dimension sizes. */
7700 for (i--; i >= 0; i--)
7702 mpz_clear (shape[i]);
7703 mpz_clear (shape2[i]);
7709 /* Check whether a WHERE assignment target or a WHERE mask expression
7710 has the same shape as the outmost WHERE mask expression. */
7713 resolve_where (gfc_code *code, gfc_expr *mask)
7719 cblock = code->block;
7721 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7722 In case of nested WHERE, only the outmost one is stored. */
7723 if (mask == NULL) /* outmost WHERE */
7725 else /* inner WHERE */
7732 /* Check if the mask-expr has a consistent shape with the
7733 outmost WHERE mask-expr. */
7734 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7735 gfc_error ("WHERE mask at %L has inconsistent shape",
7736 &cblock->expr1->where);
7739 /* the assignment statement of a WHERE statement, or the first
7740 statement in where-body-construct of a WHERE construct */
7741 cnext = cblock->next;
7746 /* WHERE assignment statement */
7749 /* Check shape consistent for WHERE assignment target. */
7750 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7751 gfc_error ("WHERE assignment target at %L has "
7752 "inconsistent shape", &cnext->expr1->where);
7756 case EXEC_ASSIGN_CALL:
7757 resolve_call (cnext);
7758 if (!cnext->resolved_sym->attr.elemental)
7759 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7760 &cnext->ext.actual->expr->where);
7763 /* WHERE or WHERE construct is part of a where-body-construct */
7765 resolve_where (cnext, e);
7769 gfc_error ("Unsupported statement inside WHERE at %L",
7772 /* the next statement within the same where-body-construct */
7773 cnext = cnext->next;
7775 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7776 cblock = cblock->block;
7781 /* Resolve assignment in FORALL construct.
7782 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7783 FORALL index variables. */
7786 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7790 for (n = 0; n < nvar; n++)
7792 gfc_symbol *forall_index;
7794 forall_index = var_expr[n]->symtree->n.sym;
7796 /* Check whether the assignment target is one of the FORALL index
7798 if ((code->expr1->expr_type == EXPR_VARIABLE)
7799 && (code->expr1->symtree->n.sym == forall_index))
7800 gfc_error ("Assignment to a FORALL index variable at %L",
7801 &code->expr1->where);
7804 /* If one of the FORALL index variables doesn't appear in the
7805 assignment variable, then there could be a many-to-one
7806 assignment. Emit a warning rather than an error because the
7807 mask could be resolving this problem. */
7808 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7809 gfc_warning ("The FORALL with index '%s' is not used on the "
7810 "left side of the assignment at %L and so might "
7811 "cause multiple assignment to this object",
7812 var_expr[n]->symtree->name, &code->expr1->where);
7818 /* Resolve WHERE statement in FORALL construct. */
7821 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7822 gfc_expr **var_expr)
7827 cblock = code->block;
7830 /* the assignment statement of a WHERE statement, or the first
7831 statement in where-body-construct of a WHERE construct */
7832 cnext = cblock->next;
7837 /* WHERE assignment statement */
7839 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7842 /* WHERE operator assignment statement */
7843 case EXEC_ASSIGN_CALL:
7844 resolve_call (cnext);
7845 if (!cnext->resolved_sym->attr.elemental)
7846 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7847 &cnext->ext.actual->expr->where);
7850 /* WHERE or WHERE construct is part of a where-body-construct */
7852 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7856 gfc_error ("Unsupported statement inside WHERE at %L",
7859 /* the next statement within the same where-body-construct */
7860 cnext = cnext->next;
7862 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7863 cblock = cblock->block;
7868 /* Traverse the FORALL body to check whether the following errors exist:
7869 1. For assignment, check if a many-to-one assignment happens.
7870 2. For WHERE statement, check the WHERE body to see if there is any
7871 many-to-one assignment. */
7874 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7878 c = code->block->next;
7884 case EXEC_POINTER_ASSIGN:
7885 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7888 case EXEC_ASSIGN_CALL:
7892 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7893 there is no need to handle it here. */
7897 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7902 /* The next statement in the FORALL body. */
7908 /* Counts the number of iterators needed inside a forall construct, including
7909 nested forall constructs. This is used to allocate the needed memory
7910 in gfc_resolve_forall. */
7913 gfc_count_forall_iterators (gfc_code *code)
7915 int max_iters, sub_iters, current_iters;
7916 gfc_forall_iterator *fa;
7918 gcc_assert(code->op == EXEC_FORALL);
7922 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7925 code = code->block->next;
7929 if (code->op == EXEC_FORALL)
7931 sub_iters = gfc_count_forall_iterators (code);
7932 if (sub_iters > max_iters)
7933 max_iters = sub_iters;
7938 return current_iters + max_iters;
7942 /* Given a FORALL construct, first resolve the FORALL iterator, then call
7943 gfc_resolve_forall_body to resolve the FORALL body. */
7946 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
7948 static gfc_expr **var_expr;
7949 static int total_var = 0;
7950 static int nvar = 0;
7952 gfc_forall_iterator *fa;
7957 /* Start to resolve a FORALL construct */
7958 if (forall_save == 0)
7960 /* Count the total number of FORALL index in the nested FORALL
7961 construct in order to allocate the VAR_EXPR with proper size. */
7962 total_var = gfc_count_forall_iterators (code);
7964 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
7965 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
7968 /* The information about FORALL iterator, including FORALL index start, end
7969 and stride. The FORALL index can not appear in start, end or stride. */
7970 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7972 /* Check if any outer FORALL index name is the same as the current
7974 for (i = 0; i < nvar; i++)
7976 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
7978 gfc_error ("An outer FORALL construct already has an index "
7979 "with this name %L", &fa->var->where);
7983 /* Record the current FORALL index. */
7984 var_expr[nvar] = gfc_copy_expr (fa->var);
7988 /* No memory leak. */
7989 gcc_assert (nvar <= total_var);
7992 /* Resolve the FORALL body. */
7993 gfc_resolve_forall_body (code, nvar, var_expr);
7995 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
7996 gfc_resolve_blocks (code->block, ns);
8000 /* Free only the VAR_EXPRs allocated in this frame. */
8001 for (i = nvar; i < tmp; i++)
8002 gfc_free_expr (var_expr[i]);
8006 /* We are in the outermost FORALL construct. */
8007 gcc_assert (forall_save == 0);
8009 /* VAR_EXPR is not needed any more. */
8010 gfc_free (var_expr);
8016 /* Resolve a BLOCK construct statement. */
8019 resolve_block_construct (gfc_code* code)
8021 /* Eventually, we may want to do some checks here or handle special stuff.
8022 But so far the only thing we can do is resolving the local namespace. */
8024 gfc_resolve (code->ext.ns);
8028 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8031 static void resolve_code (gfc_code *, gfc_namespace *);
8034 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8038 for (; b; b = b->block)
8040 t = gfc_resolve_expr (b->expr1);
8041 if (gfc_resolve_expr (b->expr2) == FAILURE)
8047 if (t == SUCCESS && b->expr1 != NULL
8048 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8049 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8056 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8057 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8062 resolve_branch (b->label1, b);
8066 resolve_block_construct (b);
8070 case EXEC_SELECT_TYPE:
8081 case EXEC_OMP_ATOMIC:
8082 case EXEC_OMP_CRITICAL:
8084 case EXEC_OMP_MASTER:
8085 case EXEC_OMP_ORDERED:
8086 case EXEC_OMP_PARALLEL:
8087 case EXEC_OMP_PARALLEL_DO:
8088 case EXEC_OMP_PARALLEL_SECTIONS:
8089 case EXEC_OMP_PARALLEL_WORKSHARE:
8090 case EXEC_OMP_SECTIONS:
8091 case EXEC_OMP_SINGLE:
8093 case EXEC_OMP_TASKWAIT:
8094 case EXEC_OMP_WORKSHARE:
8098 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8101 resolve_code (b->next, ns);
8106 /* Does everything to resolve an ordinary assignment. Returns true
8107 if this is an interface assignment. */
8109 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8119 if (gfc_extend_assign (code, ns) == SUCCESS)
8123 if (code->op == EXEC_ASSIGN_CALL)
8125 lhs = code->ext.actual->expr;
8126 rhsptr = &code->ext.actual->next->expr;
8130 gfc_actual_arglist* args;
8131 gfc_typebound_proc* tbp;
8133 gcc_assert (code->op == EXEC_COMPCALL);
8135 args = code->expr1->value.compcall.actual;
8137 rhsptr = &args->next->expr;
8139 tbp = code->expr1->value.compcall.tbp;
8140 gcc_assert (!tbp->is_generic);
8143 /* Make a temporary rhs when there is a default initializer
8144 and rhs is the same symbol as the lhs. */
8145 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8146 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8147 && has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8148 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8149 *rhsptr = gfc_get_parentheses (*rhsptr);
8158 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8159 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8160 &code->loc) == FAILURE)
8163 /* Handle the case of a BOZ literal on the RHS. */
8164 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8167 if (gfc_option.warn_surprising)
8168 gfc_warning ("BOZ literal at %L is bitwise transferred "
8169 "non-integer symbol '%s'", &code->loc,
8170 lhs->symtree->n.sym->name);
8172 if (!gfc_convert_boz (rhs, &lhs->ts))
8174 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8176 if (rc == ARITH_UNDERFLOW)
8177 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8178 ". This check can be disabled with the option "
8179 "-fno-range-check", &rhs->where);
8180 else if (rc == ARITH_OVERFLOW)
8181 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8182 ". This check can be disabled with the option "
8183 "-fno-range-check", &rhs->where);
8184 else if (rc == ARITH_NAN)
8185 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8186 ". This check can be disabled with the option "
8187 "-fno-range-check", &rhs->where);
8193 if (lhs->ts.type == BT_CHARACTER
8194 && gfc_option.warn_character_truncation)
8196 if (lhs->ts.u.cl != NULL
8197 && lhs->ts.u.cl->length != NULL
8198 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8199 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8201 if (rhs->expr_type == EXPR_CONSTANT)
8202 rlen = rhs->value.character.length;
8204 else if (rhs->ts.u.cl != NULL
8205 && rhs->ts.u.cl->length != NULL
8206 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8207 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8209 if (rlen && llen && rlen > llen)
8210 gfc_warning_now ("CHARACTER expression will be truncated "
8211 "in assignment (%d/%d) at %L",
8212 llen, rlen, &code->loc);
8215 /* Ensure that a vector index expression for the lvalue is evaluated
8216 to a temporary if the lvalue symbol is referenced in it. */
8219 for (ref = lhs->ref; ref; ref= ref->next)
8220 if (ref->type == REF_ARRAY)
8222 for (n = 0; n < ref->u.ar.dimen; n++)
8223 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8224 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8225 ref->u.ar.start[n]))
8227 = gfc_get_parentheses (ref->u.ar.start[n]);
8231 if (gfc_pure (NULL))
8233 if (gfc_impure_variable (lhs->symtree->n.sym))
8235 gfc_error ("Cannot assign to variable '%s' in PURE "
8237 lhs->symtree->n.sym->name,
8242 if (lhs->ts.type == BT_DERIVED
8243 && lhs->expr_type == EXPR_VARIABLE
8244 && lhs->ts.u.derived->attr.pointer_comp
8245 && rhs->expr_type == EXPR_VARIABLE
8246 && (gfc_impure_variable (rhs->symtree->n.sym)
8247 || gfc_is_coindexed (rhs)))
8250 if (gfc_is_coindexed (rhs))
8251 gfc_error ("Coindexed expression at %L is assigned to "
8252 "a derived type variable with a POINTER "
8253 "component in a PURE procedure",
8256 gfc_error ("The impure variable at %L is assigned to "
8257 "a derived type variable with a POINTER "
8258 "component in a PURE procedure (12.6)",
8263 /* Fortran 2008, C1283. */
8264 if (gfc_is_coindexed (lhs))
8266 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8267 "procedure", &rhs->where);
8273 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
8274 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
8275 if (lhs->ts.type == BT_CLASS)
8277 gfc_error ("Variable must not be polymorphic in assignment at %L",
8282 /* F2008, Section 7.2.1.2. */
8283 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
8285 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
8286 "component in assignment at %L", &lhs->where);
8290 gfc_check_assign (lhs, rhs, 1);
8295 /* Given a block of code, recursively resolve everything pointed to by this
8299 resolve_code (gfc_code *code, gfc_namespace *ns)
8301 int omp_workshare_save;
8306 frame.prev = cs_base;
8310 find_reachable_labels (code);
8312 for (; code; code = code->next)
8314 frame.current = code;
8315 forall_save = forall_flag;
8317 if (code->op == EXEC_FORALL)
8320 gfc_resolve_forall (code, ns, forall_save);
8323 else if (code->block)
8325 omp_workshare_save = -1;
8328 case EXEC_OMP_PARALLEL_WORKSHARE:
8329 omp_workshare_save = omp_workshare_flag;
8330 omp_workshare_flag = 1;
8331 gfc_resolve_omp_parallel_blocks (code, ns);
8333 case EXEC_OMP_PARALLEL:
8334 case EXEC_OMP_PARALLEL_DO:
8335 case EXEC_OMP_PARALLEL_SECTIONS:
8337 omp_workshare_save = omp_workshare_flag;
8338 omp_workshare_flag = 0;
8339 gfc_resolve_omp_parallel_blocks (code, ns);
8342 gfc_resolve_omp_do_blocks (code, ns);
8344 case EXEC_SELECT_TYPE:
8345 gfc_current_ns = code->ext.ns;
8346 gfc_resolve_blocks (code->block, gfc_current_ns);
8347 gfc_current_ns = ns;
8349 case EXEC_OMP_WORKSHARE:
8350 omp_workshare_save = omp_workshare_flag;
8351 omp_workshare_flag = 1;
8354 gfc_resolve_blocks (code->block, ns);
8358 if (omp_workshare_save != -1)
8359 omp_workshare_flag = omp_workshare_save;
8363 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
8364 t = gfc_resolve_expr (code->expr1);
8365 forall_flag = forall_save;
8367 if (gfc_resolve_expr (code->expr2) == FAILURE)
8370 if (code->op == EXEC_ALLOCATE
8371 && gfc_resolve_expr (code->expr3) == FAILURE)
8377 case EXEC_END_BLOCK:
8381 case EXEC_ERROR_STOP:
8385 case EXEC_ASSIGN_CALL:
8390 case EXEC_SYNC_IMAGES:
8391 case EXEC_SYNC_MEMORY:
8392 resolve_sync (code);
8396 /* Keep track of which entry we are up to. */
8397 current_entry_id = code->ext.entry->id;
8401 resolve_where (code, NULL);
8405 if (code->expr1 != NULL)
8407 if (code->expr1->ts.type != BT_INTEGER)
8408 gfc_error ("ASSIGNED GOTO statement at %L requires an "
8409 "INTEGER variable", &code->expr1->where);
8410 else if (code->expr1->symtree->n.sym->attr.assign != 1)
8411 gfc_error ("Variable '%s' has not been assigned a target "
8412 "label at %L", code->expr1->symtree->n.sym->name,
8413 &code->expr1->where);
8416 resolve_branch (code->label1, code);
8420 if (code->expr1 != NULL
8421 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
8422 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
8423 "INTEGER return specifier", &code->expr1->where);
8426 case EXEC_INIT_ASSIGN:
8427 case EXEC_END_PROCEDURE:
8434 if (resolve_ordinary_assign (code, ns))
8436 if (code->op == EXEC_COMPCALL)
8443 case EXEC_LABEL_ASSIGN:
8444 if (code->label1->defined == ST_LABEL_UNKNOWN)
8445 gfc_error ("Label %d referenced at %L is never defined",
8446 code->label1->value, &code->label1->where);
8448 && (code->expr1->expr_type != EXPR_VARIABLE
8449 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
8450 || code->expr1->symtree->n.sym->ts.kind
8451 != gfc_default_integer_kind
8452 || code->expr1->symtree->n.sym->as != NULL))
8453 gfc_error ("ASSIGN statement at %L requires a scalar "
8454 "default INTEGER variable", &code->expr1->where);
8457 case EXEC_POINTER_ASSIGN:
8461 gfc_check_pointer_assign (code->expr1, code->expr2);
8464 case EXEC_ARITHMETIC_IF:
8466 && code->expr1->ts.type != BT_INTEGER
8467 && code->expr1->ts.type != BT_REAL)
8468 gfc_error ("Arithmetic IF statement at %L requires a numeric "
8469 "expression", &code->expr1->where);
8471 resolve_branch (code->label1, code);
8472 resolve_branch (code->label2, code);
8473 resolve_branch (code->label3, code);
8477 if (t == SUCCESS && code->expr1 != NULL
8478 && (code->expr1->ts.type != BT_LOGICAL
8479 || code->expr1->rank != 0))
8480 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8481 &code->expr1->where);
8486 resolve_call (code);
8491 resolve_typebound_subroutine (code);
8495 resolve_ppc_call (code);
8499 /* Select is complicated. Also, a SELECT construct could be
8500 a transformed computed GOTO. */
8501 resolve_select (code);
8504 case EXEC_SELECT_TYPE:
8505 resolve_select_type (code);
8509 gfc_resolve (code->ext.ns);
8513 if (code->ext.iterator != NULL)
8515 gfc_iterator *iter = code->ext.iterator;
8516 if (gfc_resolve_iterator (iter, true) != FAILURE)
8517 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
8522 if (code->expr1 == NULL)
8523 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
8525 && (code->expr1->rank != 0
8526 || code->expr1->ts.type != BT_LOGICAL))
8527 gfc_error ("Exit condition of DO WHILE loop at %L must be "
8528 "a scalar LOGICAL expression", &code->expr1->where);
8533 resolve_allocate_deallocate (code, "ALLOCATE");
8537 case EXEC_DEALLOCATE:
8539 resolve_allocate_deallocate (code, "DEALLOCATE");
8544 if (gfc_resolve_open (code->ext.open) == FAILURE)
8547 resolve_branch (code->ext.open->err, code);
8551 if (gfc_resolve_close (code->ext.close) == FAILURE)
8554 resolve_branch (code->ext.close->err, code);
8557 case EXEC_BACKSPACE:
8561 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8564 resolve_branch (code->ext.filepos->err, code);
8568 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8571 resolve_branch (code->ext.inquire->err, code);
8575 gcc_assert (code->ext.inquire != NULL);
8576 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8579 resolve_branch (code->ext.inquire->err, code);
8583 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8586 resolve_branch (code->ext.wait->err, code);
8587 resolve_branch (code->ext.wait->end, code);
8588 resolve_branch (code->ext.wait->eor, code);
8593 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8596 resolve_branch (code->ext.dt->err, code);
8597 resolve_branch (code->ext.dt->end, code);
8598 resolve_branch (code->ext.dt->eor, code);
8602 resolve_transfer (code);
8606 resolve_forall_iterators (code->ext.forall_iterator);
8608 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8609 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8610 "expression", &code->expr1->where);
8613 case EXEC_OMP_ATOMIC:
8614 case EXEC_OMP_BARRIER:
8615 case EXEC_OMP_CRITICAL:
8616 case EXEC_OMP_FLUSH:
8618 case EXEC_OMP_MASTER:
8619 case EXEC_OMP_ORDERED:
8620 case EXEC_OMP_SECTIONS:
8621 case EXEC_OMP_SINGLE:
8622 case EXEC_OMP_TASKWAIT:
8623 case EXEC_OMP_WORKSHARE:
8624 gfc_resolve_omp_directive (code, ns);
8627 case EXEC_OMP_PARALLEL:
8628 case EXEC_OMP_PARALLEL_DO:
8629 case EXEC_OMP_PARALLEL_SECTIONS:
8630 case EXEC_OMP_PARALLEL_WORKSHARE:
8632 omp_workshare_save = omp_workshare_flag;
8633 omp_workshare_flag = 0;
8634 gfc_resolve_omp_directive (code, ns);
8635 omp_workshare_flag = omp_workshare_save;
8639 gfc_internal_error ("resolve_code(): Bad statement code");
8643 cs_base = frame.prev;
8647 /* Resolve initial values and make sure they are compatible with
8651 resolve_values (gfc_symbol *sym)
8653 if (sym->value == NULL)
8656 if (gfc_resolve_expr (sym->value) == FAILURE)
8659 gfc_check_assign_symbol (sym, sym->value);
8663 /* Verify the binding labels for common blocks that are BIND(C). The label
8664 for a BIND(C) common block must be identical in all scoping units in which
8665 the common block is declared. Further, the binding label can not collide
8666 with any other global entity in the program. */
8669 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8671 if (comm_block_tree->n.common->is_bind_c == 1)
8673 gfc_gsymbol *binding_label_gsym;
8674 gfc_gsymbol *comm_name_gsym;
8676 /* See if a global symbol exists by the common block's name. It may
8677 be NULL if the common block is use-associated. */
8678 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8679 comm_block_tree->n.common->name);
8680 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8681 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8682 "with the global entity '%s' at %L",
8683 comm_block_tree->n.common->binding_label,
8684 comm_block_tree->n.common->name,
8685 &(comm_block_tree->n.common->where),
8686 comm_name_gsym->name, &(comm_name_gsym->where));
8687 else if (comm_name_gsym != NULL
8688 && strcmp (comm_name_gsym->name,
8689 comm_block_tree->n.common->name) == 0)
8691 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8693 if (comm_name_gsym->binding_label == NULL)
8694 /* No binding label for common block stored yet; save this one. */
8695 comm_name_gsym->binding_label =
8696 comm_block_tree->n.common->binding_label;
8698 if (strcmp (comm_name_gsym->binding_label,
8699 comm_block_tree->n.common->binding_label) != 0)
8701 /* Common block names match but binding labels do not. */
8702 gfc_error ("Binding label '%s' for common block '%s' at %L "
8703 "does not match the binding label '%s' for common "
8705 comm_block_tree->n.common->binding_label,
8706 comm_block_tree->n.common->name,
8707 &(comm_block_tree->n.common->where),
8708 comm_name_gsym->binding_label,
8709 comm_name_gsym->name,
8710 &(comm_name_gsym->where));
8715 /* There is no binding label (NAME="") so we have nothing further to
8716 check and nothing to add as a global symbol for the label. */
8717 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8720 binding_label_gsym =
8721 gfc_find_gsymbol (gfc_gsym_root,
8722 comm_block_tree->n.common->binding_label);
8723 if (binding_label_gsym == NULL)
8725 /* Need to make a global symbol for the binding label to prevent
8726 it from colliding with another. */
8727 binding_label_gsym =
8728 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8729 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8730 binding_label_gsym->type = GSYM_COMMON;
8734 /* If comm_name_gsym is NULL, the name common block is use
8735 associated and the name could be colliding. */
8736 if (binding_label_gsym->type != GSYM_COMMON)
8737 gfc_error ("Binding label '%s' for common block '%s' at %L "
8738 "collides with the global entity '%s' at %L",
8739 comm_block_tree->n.common->binding_label,
8740 comm_block_tree->n.common->name,
8741 &(comm_block_tree->n.common->where),
8742 binding_label_gsym->name,
8743 &(binding_label_gsym->where));
8744 else if (comm_name_gsym != NULL
8745 && (strcmp (binding_label_gsym->name,
8746 comm_name_gsym->binding_label) != 0)
8747 && (strcmp (binding_label_gsym->sym_name,
8748 comm_name_gsym->name) != 0))
8749 gfc_error ("Binding label '%s' for common block '%s' at %L "
8750 "collides with global entity '%s' at %L",
8751 binding_label_gsym->name, binding_label_gsym->sym_name,
8752 &(comm_block_tree->n.common->where),
8753 comm_name_gsym->name, &(comm_name_gsym->where));
8761 /* Verify any BIND(C) derived types in the namespace so we can report errors
8762 for them once, rather than for each variable declared of that type. */
8765 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8767 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8768 && derived_sym->attr.is_bind_c == 1)
8769 verify_bind_c_derived_type (derived_sym);
8775 /* Verify that any binding labels used in a given namespace do not collide
8776 with the names or binding labels of any global symbols. */
8779 gfc_verify_binding_labels (gfc_symbol *sym)
8783 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8784 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8786 gfc_gsymbol *bind_c_sym;
8788 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8789 if (bind_c_sym != NULL
8790 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8792 if (sym->attr.if_source == IFSRC_DECL
8793 && (bind_c_sym->type != GSYM_SUBROUTINE
8794 && bind_c_sym->type != GSYM_FUNCTION)
8795 && ((sym->attr.contained == 1
8796 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8797 || (sym->attr.use_assoc == 1
8798 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8800 /* Make sure global procedures don't collide with anything. */
8801 gfc_error ("Binding label '%s' at %L collides with the global "
8802 "entity '%s' at %L", sym->binding_label,
8803 &(sym->declared_at), bind_c_sym->name,
8804 &(bind_c_sym->where));
8807 else if (sym->attr.contained == 0
8808 && (sym->attr.if_source == IFSRC_IFBODY
8809 && sym->attr.flavor == FL_PROCEDURE)
8810 && (bind_c_sym->sym_name != NULL
8811 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8813 /* Make sure procedures in interface bodies don't collide. */
8814 gfc_error ("Binding label '%s' in interface body at %L collides "
8815 "with the global entity '%s' at %L",
8817 &(sym->declared_at), bind_c_sym->name,
8818 &(bind_c_sym->where));
8821 else if (sym->attr.contained == 0
8822 && sym->attr.if_source == IFSRC_UNKNOWN)
8823 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8824 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8825 || sym->attr.use_assoc == 0)
8827 gfc_error ("Binding label '%s' at %L collides with global "
8828 "entity '%s' at %L", sym->binding_label,
8829 &(sym->declared_at), bind_c_sym->name,
8830 &(bind_c_sym->where));
8835 /* Clear the binding label to prevent checking multiple times. */
8836 sym->binding_label[0] = '\0';
8838 else if (bind_c_sym == NULL)
8840 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8841 bind_c_sym->where = sym->declared_at;
8842 bind_c_sym->sym_name = sym->name;
8844 if (sym->attr.use_assoc == 1)
8845 bind_c_sym->mod_name = sym->module;
8847 if (sym->ns->proc_name != NULL)
8848 bind_c_sym->mod_name = sym->ns->proc_name->name;
8850 if (sym->attr.contained == 0)
8852 if (sym->attr.subroutine)
8853 bind_c_sym->type = GSYM_SUBROUTINE;
8854 else if (sym->attr.function)
8855 bind_c_sym->type = GSYM_FUNCTION;
8863 /* Resolve an index expression. */
8866 resolve_index_expr (gfc_expr *e)
8868 if (gfc_resolve_expr (e) == FAILURE)
8871 if (gfc_simplify_expr (e, 0) == FAILURE)
8874 if (gfc_specification_expr (e) == FAILURE)
8880 /* Resolve a charlen structure. */
8883 resolve_charlen (gfc_charlen *cl)
8892 specification_expr = 1;
8894 if (resolve_index_expr (cl->length) == FAILURE)
8896 specification_expr = 0;
8900 /* "If the character length parameter value evaluates to a negative
8901 value, the length of character entities declared is zero." */
8902 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8904 if (gfc_option.warn_surprising)
8905 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
8906 " the length has been set to zero",
8907 &cl->length->where, i);
8908 gfc_replace_expr (cl->length,
8909 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
8912 /* Check that the character length is not too large. */
8913 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8914 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8915 && cl->length->ts.type == BT_INTEGER
8916 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8918 gfc_error ("String length at %L is too large", &cl->length->where);
8926 /* Test for non-constant shape arrays. */
8929 is_non_constant_shape_array (gfc_symbol *sym)
8935 not_constant = false;
8936 if (sym->as != NULL)
8938 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
8939 has not been simplified; parameter array references. Do the
8940 simplification now. */
8941 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
8943 e = sym->as->lower[i];
8944 if (e && (resolve_index_expr (e) == FAILURE
8945 || !gfc_is_constant_expr (e)))
8946 not_constant = true;
8947 e = sym->as->upper[i];
8948 if (e && (resolve_index_expr (e) == FAILURE
8949 || !gfc_is_constant_expr (e)))
8950 not_constant = true;
8953 return not_constant;
8956 /* Given a symbol and an initialization expression, add code to initialize
8957 the symbol to the function entry. */
8959 build_init_assign (gfc_symbol *sym, gfc_expr *init)
8963 gfc_namespace *ns = sym->ns;
8965 /* Search for the function namespace if this is a contained
8966 function without an explicit result. */
8967 if (sym->attr.function && sym == sym->result
8968 && sym->name != sym->ns->proc_name->name)
8971 for (;ns; ns = ns->sibling)
8972 if (strcmp (ns->proc_name->name, sym->name) == 0)
8978 gfc_free_expr (init);
8982 /* Build an l-value expression for the result. */
8983 lval = gfc_lval_expr_from_sym (sym);
8985 /* Add the code at scope entry. */
8986 init_st = gfc_get_code ();
8987 init_st->next = ns->code;
8990 /* Assign the default initializer to the l-value. */
8991 init_st->loc = sym->declared_at;
8992 init_st->op = EXEC_INIT_ASSIGN;
8993 init_st->expr1 = lval;
8994 init_st->expr2 = init;
8997 /* Assign the default initializer to a derived type variable or result. */
9000 apply_default_init (gfc_symbol *sym)
9002 gfc_expr *init = NULL;
9004 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9007 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
9008 init = gfc_default_initializer (&sym->ts);
9013 build_init_assign (sym, init);
9016 /* Build an initializer for a local integer, real, complex, logical, or
9017 character variable, based on the command line flags finit-local-zero,
9018 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
9019 null if the symbol should not have a default initialization. */
9021 build_default_init_expr (gfc_symbol *sym)
9024 gfc_expr *init_expr;
9027 /* These symbols should never have a default initialization. */
9028 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
9029 || sym->attr.external
9031 || sym->attr.pointer
9032 || sym->attr.in_equivalence
9033 || sym->attr.in_common
9036 || sym->attr.cray_pointee
9037 || sym->attr.cray_pointer)
9040 /* Now we'll try to build an initializer expression. */
9041 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9044 /* We will only initialize integers, reals, complex, logicals, and
9045 characters, and only if the corresponding command-line flags
9046 were set. Otherwise, we free init_expr and return null. */
9047 switch (sym->ts.type)
9050 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9051 mpz_init_set_si (init_expr->value.integer,
9052 gfc_option.flag_init_integer_value);
9055 gfc_free_expr (init_expr);
9061 mpfr_init (init_expr->value.real);
9062 switch (gfc_option.flag_init_real)
9064 case GFC_INIT_REAL_SNAN:
9065 init_expr->is_snan = 1;
9067 case GFC_INIT_REAL_NAN:
9068 mpfr_set_nan (init_expr->value.real);
9071 case GFC_INIT_REAL_INF:
9072 mpfr_set_inf (init_expr->value.real, 1);
9075 case GFC_INIT_REAL_NEG_INF:
9076 mpfr_set_inf (init_expr->value.real, -1);
9079 case GFC_INIT_REAL_ZERO:
9080 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9084 gfc_free_expr (init_expr);
9091 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
9092 switch (gfc_option.flag_init_real)
9094 case GFC_INIT_REAL_SNAN:
9095 init_expr->is_snan = 1;
9097 case GFC_INIT_REAL_NAN:
9098 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9099 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9102 case GFC_INIT_REAL_INF:
9103 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
9104 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
9107 case GFC_INIT_REAL_NEG_INF:
9108 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9109 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9112 case GFC_INIT_REAL_ZERO:
9113 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9117 gfc_free_expr (init_expr);
9124 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9125 init_expr->value.logical = 0;
9126 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9127 init_expr->value.logical = 1;
9130 gfc_free_expr (init_expr);
9136 /* For characters, the length must be constant in order to
9137 create a default initializer. */
9138 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9139 && sym->ts.u.cl->length
9140 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9142 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9143 init_expr->value.character.length = char_len;
9144 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9145 for (i = 0; i < char_len; i++)
9146 init_expr->value.character.string[i]
9147 = (unsigned char) gfc_option.flag_init_character_value;
9151 gfc_free_expr (init_expr);
9157 gfc_free_expr (init_expr);
9163 /* Add an initialization expression to a local variable. */
9165 apply_default_init_local (gfc_symbol *sym)
9167 gfc_expr *init = NULL;
9169 /* The symbol should be a variable or a function return value. */
9170 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9171 || (sym->attr.function && sym->result != sym))
9174 /* Try to build the initializer expression. If we can't initialize
9175 this symbol, then init will be NULL. */
9176 init = build_default_init_expr (sym);
9180 /* For saved variables, we don't want to add an initializer at
9181 function entry, so we just add a static initializer. */
9182 if (sym->attr.save || sym->ns->save_all
9183 || gfc_option.flag_max_stack_var_size == 0)
9185 /* Don't clobber an existing initializer! */
9186 gcc_assert (sym->value == NULL);
9191 build_init_assign (sym, init);
9194 /* Resolution of common features of flavors variable and procedure. */
9197 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9199 /* Constraints on deferred shape variable. */
9200 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9202 if (sym->attr.allocatable)
9204 if (sym->attr.dimension)
9206 gfc_error ("Allocatable array '%s' at %L must have "
9207 "a deferred shape", sym->name, &sym->declared_at);
9210 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9211 "may not be ALLOCATABLE", sym->name,
9212 &sym->declared_at) == FAILURE)
9216 if (sym->attr.pointer && sym->attr.dimension)
9218 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
9219 sym->name, &sym->declared_at);
9226 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
9227 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
9229 gfc_error ("Array '%s' at %L cannot have a deferred shape",
9230 sym->name, &sym->declared_at);
9238 /* Additional checks for symbols with flavor variable and derived
9239 type. To be called from resolve_fl_variable. */
9242 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
9244 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
9246 /* Check to see if a derived type is blocked from being host
9247 associated by the presence of another class I symbol in the same
9248 namespace. 14.6.1.3 of the standard and the discussion on
9249 comp.lang.fortran. */
9250 if (sym->ns != sym->ts.u.derived->ns
9251 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
9254 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
9255 if (s && s->attr.flavor != FL_DERIVED)
9257 gfc_error ("The type '%s' cannot be host associated at %L "
9258 "because it is blocked by an incompatible object "
9259 "of the same name declared at %L",
9260 sym->ts.u.derived->name, &sym->declared_at,
9266 /* 4th constraint in section 11.3: "If an object of a type for which
9267 component-initialization is specified (R429) appears in the
9268 specification-part of a module and does not have the ALLOCATABLE
9269 or POINTER attribute, the object shall have the SAVE attribute."
9271 The check for initializers is performed with
9272 has_default_initializer because gfc_default_initializer generates
9273 a hidden default for allocatable components. */
9274 if (!(sym->value || no_init_flag) && sym->ns->proc_name
9275 && sym->ns->proc_name->attr.flavor == FL_MODULE
9276 && !sym->ns->save_all && !sym->attr.save
9277 && !sym->attr.pointer && !sym->attr.allocatable
9278 && has_default_initializer (sym->ts.u.derived)
9279 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
9280 "module variable '%s' at %L, needed due to "
9281 "the default initialization", sym->name,
9282 &sym->declared_at) == FAILURE)
9285 if (sym->ts.type == BT_CLASS)
9288 if (!gfc_type_is_extensible (sym->ts.u.derived->components->ts.u.derived))
9290 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
9291 sym->ts.u.derived->components->ts.u.derived->name,
9292 sym->name, &sym->declared_at);
9297 /* Assume that use associated symbols were checked in the module ns. */
9298 if (!sym->attr.class_ok && !sym->attr.use_assoc)
9300 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
9301 "or pointer", sym->name, &sym->declared_at);
9306 /* Assign default initializer. */
9307 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
9308 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
9310 sym->value = gfc_default_initializer (&sym->ts);
9317 /* Resolve symbols with flavor variable. */
9320 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
9322 int no_init_flag, automatic_flag;
9324 const char *auto_save_msg;
9326 auto_save_msg = "Automatic object '%s' at %L cannot have the "
9329 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9332 /* Set this flag to check that variables are parameters of all entries.
9333 This check is effected by the call to gfc_resolve_expr through
9334 is_non_constant_shape_array. */
9335 specification_expr = 1;
9337 if (sym->ns->proc_name
9338 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9339 || sym->ns->proc_name->attr.is_main_program)
9340 && !sym->attr.use_assoc
9341 && !sym->attr.allocatable
9342 && !sym->attr.pointer
9343 && is_non_constant_shape_array (sym))
9345 /* The shape of a main program or module array needs to be
9347 gfc_error ("The module or main program array '%s' at %L must "
9348 "have constant shape", sym->name, &sym->declared_at);
9349 specification_expr = 0;
9353 if (sym->ts.type == BT_CHARACTER)
9355 /* Make sure that character string variables with assumed length are
9357 e = sym->ts.u.cl->length;
9358 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
9360 gfc_error ("Entity with assumed character length at %L must be a "
9361 "dummy argument or a PARAMETER", &sym->declared_at);
9365 if (e && sym->attr.save && !gfc_is_constant_expr (e))
9367 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9371 if (!gfc_is_constant_expr (e)
9372 && !(e->expr_type == EXPR_VARIABLE
9373 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
9374 && sym->ns->proc_name
9375 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9376 || sym->ns->proc_name->attr.is_main_program)
9377 && !sym->attr.use_assoc)
9379 gfc_error ("'%s' at %L must have constant character length "
9380 "in this context", sym->name, &sym->declared_at);
9385 if (sym->value == NULL && sym->attr.referenced)
9386 apply_default_init_local (sym); /* Try to apply a default initialization. */
9388 /* Determine if the symbol may not have an initializer. */
9389 no_init_flag = automatic_flag = 0;
9390 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
9391 || sym->attr.intrinsic || sym->attr.result)
9393 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
9394 && is_non_constant_shape_array (sym))
9396 no_init_flag = automatic_flag = 1;
9398 /* Also, they must not have the SAVE attribute.
9399 SAVE_IMPLICIT is checked below. */
9400 if (sym->attr.save == SAVE_EXPLICIT)
9402 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9407 /* Ensure that any initializer is simplified. */
9409 gfc_simplify_expr (sym->value, 1);
9411 /* Reject illegal initializers. */
9412 if (!sym->mark && sym->value)
9414 if (sym->attr.allocatable)
9415 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
9416 sym->name, &sym->declared_at);
9417 else if (sym->attr.external)
9418 gfc_error ("External '%s' at %L cannot have an initializer",
9419 sym->name, &sym->declared_at);
9420 else if (sym->attr.dummy
9421 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
9422 gfc_error ("Dummy '%s' at %L cannot have an initializer",
9423 sym->name, &sym->declared_at);
9424 else if (sym->attr.intrinsic)
9425 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
9426 sym->name, &sym->declared_at);
9427 else if (sym->attr.result)
9428 gfc_error ("Function result '%s' at %L cannot have an initializer",
9429 sym->name, &sym->declared_at);
9430 else if (automatic_flag)
9431 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
9432 sym->name, &sym->declared_at);
9439 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
9440 return resolve_fl_variable_derived (sym, no_init_flag);
9446 /* Resolve a procedure. */
9449 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
9451 gfc_formal_arglist *arg;
9453 if (sym->attr.function
9454 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9457 if (sym->ts.type == BT_CHARACTER)
9459 gfc_charlen *cl = sym->ts.u.cl;
9461 if (cl && cl->length && gfc_is_constant_expr (cl->length)
9462 && resolve_charlen (cl) == FAILURE)
9465 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9466 && sym->attr.proc == PROC_ST_FUNCTION)
9468 gfc_error ("Character-valued statement function '%s' at %L must "
9469 "have constant length", sym->name, &sym->declared_at);
9474 /* Ensure that derived type for are not of a private type. Internal
9475 module procedures are excluded by 2.2.3.3 - i.e., they are not
9476 externally accessible and can access all the objects accessible in
9478 if (!(sym->ns->parent
9479 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
9480 && gfc_check_access(sym->attr.access, sym->ns->default_access))
9482 gfc_interface *iface;
9484 for (arg = sym->formal; arg; arg = arg->next)
9487 && arg->sym->ts.type == BT_DERIVED
9488 && !arg->sym->ts.u.derived->attr.use_assoc
9489 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9490 arg->sym->ts.u.derived->ns->default_access)
9491 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
9492 "PRIVATE type and cannot be a dummy argument"
9493 " of '%s', which is PUBLIC at %L",
9494 arg->sym->name, sym->name, &sym->declared_at)
9497 /* Stop this message from recurring. */
9498 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9503 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9504 PRIVATE to the containing module. */
9505 for (iface = sym->generic; iface; iface = iface->next)
9507 for (arg = iface->sym->formal; arg; arg = arg->next)
9510 && arg->sym->ts.type == BT_DERIVED
9511 && !arg->sym->ts.u.derived->attr.use_assoc
9512 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9513 arg->sym->ts.u.derived->ns->default_access)
9514 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9515 "'%s' in PUBLIC interface '%s' at %L "
9516 "takes dummy arguments of '%s' which is "
9517 "PRIVATE", iface->sym->name, sym->name,
9518 &iface->sym->declared_at,
9519 gfc_typename (&arg->sym->ts)) == FAILURE)
9521 /* Stop this message from recurring. */
9522 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9528 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9529 PRIVATE to the containing module. */
9530 for (iface = sym->generic; iface; iface = iface->next)
9532 for (arg = iface->sym->formal; arg; arg = arg->next)
9535 && arg->sym->ts.type == BT_DERIVED
9536 && !arg->sym->ts.u.derived->attr.use_assoc
9537 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9538 arg->sym->ts.u.derived->ns->default_access)
9539 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9540 "'%s' in PUBLIC interface '%s' at %L "
9541 "takes dummy arguments of '%s' which is "
9542 "PRIVATE", iface->sym->name, sym->name,
9543 &iface->sym->declared_at,
9544 gfc_typename (&arg->sym->ts)) == FAILURE)
9546 /* Stop this message from recurring. */
9547 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9554 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9555 && !sym->attr.proc_pointer)
9557 gfc_error ("Function '%s' at %L cannot have an initializer",
9558 sym->name, &sym->declared_at);
9562 /* An external symbol may not have an initializer because it is taken to be
9563 a procedure. Exception: Procedure Pointers. */
9564 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9566 gfc_error ("External object '%s' at %L may not have an initializer",
9567 sym->name, &sym->declared_at);
9571 /* An elemental function is required to return a scalar 12.7.1 */
9572 if (sym->attr.elemental && sym->attr.function && sym->as)
9574 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9575 "result", sym->name, &sym->declared_at);
9576 /* Reset so that the error only occurs once. */
9577 sym->attr.elemental = 0;
9581 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9582 char-len-param shall not be array-valued, pointer-valued, recursive
9583 or pure. ....snip... A character value of * may only be used in the
9584 following ways: (i) Dummy arg of procedure - dummy associates with
9585 actual length; (ii) To declare a named constant; or (iii) External
9586 function - but length must be declared in calling scoping unit. */
9587 if (sym->attr.function
9588 && sym->ts.type == BT_CHARACTER
9589 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9591 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9592 || (sym->attr.recursive) || (sym->attr.pure))
9594 if (sym->as && sym->as->rank)
9595 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9596 "array-valued", sym->name, &sym->declared_at);
9598 if (sym->attr.pointer)
9599 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9600 "pointer-valued", sym->name, &sym->declared_at);
9603 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9604 "pure", sym->name, &sym->declared_at);
9606 if (sym->attr.recursive)
9607 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9608 "recursive", sym->name, &sym->declared_at);
9613 /* Appendix B.2 of the standard. Contained functions give an
9614 error anyway. Fixed-form is likely to be F77/legacy. */
9615 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9616 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9617 "CHARACTER(*) function '%s' at %L",
9618 sym->name, &sym->declared_at);
9621 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9623 gfc_formal_arglist *curr_arg;
9624 int has_non_interop_arg = 0;
9626 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9627 sym->common_block) == FAILURE)
9629 /* Clear these to prevent looking at them again if there was an
9631 sym->attr.is_bind_c = 0;
9632 sym->attr.is_c_interop = 0;
9633 sym->ts.is_c_interop = 0;
9637 /* So far, no errors have been found. */
9638 sym->attr.is_c_interop = 1;
9639 sym->ts.is_c_interop = 1;
9642 curr_arg = sym->formal;
9643 while (curr_arg != NULL)
9645 /* Skip implicitly typed dummy args here. */
9646 if (curr_arg->sym->attr.implicit_type == 0)
9647 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9648 /* If something is found to fail, record the fact so we
9649 can mark the symbol for the procedure as not being
9650 BIND(C) to try and prevent multiple errors being
9652 has_non_interop_arg = 1;
9654 curr_arg = curr_arg->next;
9657 /* See if any of the arguments were not interoperable and if so, clear
9658 the procedure symbol to prevent duplicate error messages. */
9659 if (has_non_interop_arg != 0)
9661 sym->attr.is_c_interop = 0;
9662 sym->ts.is_c_interop = 0;
9663 sym->attr.is_bind_c = 0;
9667 if (!sym->attr.proc_pointer)
9669 if (sym->attr.save == SAVE_EXPLICIT)
9671 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9672 "in '%s' at %L", sym->name, &sym->declared_at);
9675 if (sym->attr.intent)
9677 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9678 "in '%s' at %L", sym->name, &sym->declared_at);
9681 if (sym->attr.subroutine && sym->attr.result)
9683 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9684 "in '%s' at %L", sym->name, &sym->declared_at);
9687 if (sym->attr.external && sym->attr.function
9688 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9689 || sym->attr.contained))
9691 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9692 "in '%s' at %L", sym->name, &sym->declared_at);
9695 if (strcmp ("ppr@", sym->name) == 0)
9697 gfc_error ("Procedure pointer result '%s' at %L "
9698 "is missing the pointer attribute",
9699 sym->ns->proc_name->name, &sym->declared_at);
9708 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9709 been defined and we now know their defined arguments, check that they fulfill
9710 the requirements of the standard for procedures used as finalizers. */
9713 gfc_resolve_finalizers (gfc_symbol* derived)
9715 gfc_finalizer* list;
9716 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9717 gfc_try result = SUCCESS;
9718 bool seen_scalar = false;
9720 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9723 /* Walk over the list of finalizer-procedures, check them, and if any one
9724 does not fit in with the standard's definition, print an error and remove
9725 it from the list. */
9726 prev_link = &derived->f2k_derived->finalizers;
9727 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9733 /* Skip this finalizer if we already resolved it. */
9734 if (list->proc_tree)
9736 prev_link = &(list->next);
9740 /* Check this exists and is a SUBROUTINE. */
9741 if (!list->proc_sym->attr.subroutine)
9743 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9744 list->proc_sym->name, &list->where);
9748 /* We should have exactly one argument. */
9749 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9751 gfc_error ("FINAL procedure at %L must have exactly one argument",
9755 arg = list->proc_sym->formal->sym;
9757 /* This argument must be of our type. */
9758 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9760 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9761 &arg->declared_at, derived->name);
9765 /* It must neither be a pointer nor allocatable nor optional. */
9766 if (arg->attr.pointer)
9768 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9772 if (arg->attr.allocatable)
9774 gfc_error ("Argument of FINAL procedure at %L must not be"
9775 " ALLOCATABLE", &arg->declared_at);
9778 if (arg->attr.optional)
9780 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9785 /* It must not be INTENT(OUT). */
9786 if (arg->attr.intent == INTENT_OUT)
9788 gfc_error ("Argument of FINAL procedure at %L must not be"
9789 " INTENT(OUT)", &arg->declared_at);
9793 /* Warn if the procedure is non-scalar and not assumed shape. */
9794 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9795 && arg->as->type != AS_ASSUMED_SHAPE)
9796 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9797 " shape argument", &arg->declared_at);
9799 /* Check that it does not match in kind and rank with a FINAL procedure
9800 defined earlier. To really loop over the *earlier* declarations,
9801 we need to walk the tail of the list as new ones were pushed at the
9803 /* TODO: Handle kind parameters once they are implemented. */
9804 my_rank = (arg->as ? arg->as->rank : 0);
9805 for (i = list->next; i; i = i->next)
9807 /* Argument list might be empty; that is an error signalled earlier,
9808 but we nevertheless continued resolving. */
9809 if (i->proc_sym->formal)
9811 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9812 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9813 if (i_rank == my_rank)
9815 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9816 " rank (%d) as '%s'",
9817 list->proc_sym->name, &list->where, my_rank,
9824 /* Is this the/a scalar finalizer procedure? */
9825 if (!arg->as || arg->as->rank == 0)
9828 /* Find the symtree for this procedure. */
9829 gcc_assert (!list->proc_tree);
9830 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9832 prev_link = &list->next;
9835 /* Remove wrong nodes immediately from the list so we don't risk any
9836 troubles in the future when they might fail later expectations. */
9840 *prev_link = list->next;
9841 gfc_free_finalizer (i);
9844 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9845 were nodes in the list, must have been for arrays. It is surely a good
9846 idea to have a scalar version there if there's something to finalize. */
9847 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9848 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9849 " defined at %L, suggest also scalar one",
9850 derived->name, &derived->declared_at);
9852 /* TODO: Remove this error when finalization is finished. */
9853 gfc_error ("Finalization at %L is not yet implemented",
9854 &derived->declared_at);
9860 /* Check that it is ok for the typebound procedure proc to override the
9864 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9867 const gfc_symbol* proc_target;
9868 const gfc_symbol* old_target;
9869 unsigned proc_pass_arg, old_pass_arg, argpos;
9870 gfc_formal_arglist* proc_formal;
9871 gfc_formal_arglist* old_formal;
9873 /* This procedure should only be called for non-GENERIC proc. */
9874 gcc_assert (!proc->n.tb->is_generic);
9876 /* If the overwritten procedure is GENERIC, this is an error. */
9877 if (old->n.tb->is_generic)
9879 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9880 old->name, &proc->n.tb->where);
9884 where = proc->n.tb->where;
9885 proc_target = proc->n.tb->u.specific->n.sym;
9886 old_target = old->n.tb->u.specific->n.sym;
9888 /* Check that overridden binding is not NON_OVERRIDABLE. */
9889 if (old->n.tb->non_overridable)
9891 gfc_error ("'%s' at %L overrides a procedure binding declared"
9892 " NON_OVERRIDABLE", proc->name, &where);
9896 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9897 if (!old->n.tb->deferred && proc->n.tb->deferred)
9899 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9900 " non-DEFERRED binding", proc->name, &where);
9904 /* If the overridden binding is PURE, the overriding must be, too. */
9905 if (old_target->attr.pure && !proc_target->attr.pure)
9907 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9908 proc->name, &where);
9912 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9913 is not, the overriding must not be either. */
9914 if (old_target->attr.elemental && !proc_target->attr.elemental)
9916 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
9917 " ELEMENTAL", proc->name, &where);
9920 if (!old_target->attr.elemental && proc_target->attr.elemental)
9922 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
9923 " be ELEMENTAL, either", proc->name, &where);
9927 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
9929 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
9931 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
9932 " SUBROUTINE", proc->name, &where);
9936 /* If the overridden binding is a FUNCTION, the overriding must also be a
9937 FUNCTION and have the same characteristics. */
9938 if (old_target->attr.function)
9940 if (!proc_target->attr.function)
9942 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
9943 " FUNCTION", proc->name, &where);
9947 /* FIXME: Do more comprehensive checking (including, for instance, the
9948 rank and array-shape). */
9949 gcc_assert (proc_target->result && old_target->result);
9950 if (!gfc_compare_types (&proc_target->result->ts,
9951 &old_target->result->ts))
9953 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
9954 " matching result types", proc->name, &where);
9959 /* If the overridden binding is PUBLIC, the overriding one must not be
9961 if (old->n.tb->access == ACCESS_PUBLIC
9962 && proc->n.tb->access == ACCESS_PRIVATE)
9964 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
9965 " PRIVATE", proc->name, &where);
9969 /* Compare the formal argument lists of both procedures. This is also abused
9970 to find the position of the passed-object dummy arguments of both
9971 bindings as at least the overridden one might not yet be resolved and we
9972 need those positions in the check below. */
9973 proc_pass_arg = old_pass_arg = 0;
9974 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
9976 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
9979 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
9980 proc_formal && old_formal;
9981 proc_formal = proc_formal->next, old_formal = old_formal->next)
9983 if (proc->n.tb->pass_arg
9984 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
9985 proc_pass_arg = argpos;
9986 if (old->n.tb->pass_arg
9987 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
9988 old_pass_arg = argpos;
9990 /* Check that the names correspond. */
9991 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
9993 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
9994 " to match the corresponding argument of the overridden"
9995 " procedure", proc_formal->sym->name, proc->name, &where,
9996 old_formal->sym->name);
10000 /* Check that the types correspond if neither is the passed-object
10002 /* FIXME: Do more comprehensive testing here. */
10003 if (proc_pass_arg != argpos && old_pass_arg != argpos
10004 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
10006 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
10007 "in respect to the overridden procedure",
10008 proc_formal->sym->name, proc->name, &where);
10014 if (proc_formal || old_formal)
10016 gfc_error ("'%s' at %L must have the same number of formal arguments as"
10017 " the overridden procedure", proc->name, &where);
10021 /* If the overridden binding is NOPASS, the overriding one must also be
10023 if (old->n.tb->nopass && !proc->n.tb->nopass)
10025 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
10026 " NOPASS", proc->name, &where);
10030 /* If the overridden binding is PASS(x), the overriding one must also be
10031 PASS and the passed-object dummy arguments must correspond. */
10032 if (!old->n.tb->nopass)
10034 if (proc->n.tb->nopass)
10036 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
10037 " PASS", proc->name, &where);
10041 if (proc_pass_arg != old_pass_arg)
10043 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
10044 " the same position as the passed-object dummy argument of"
10045 " the overridden procedure", proc->name, &where);
10054 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10057 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10058 const char* generic_name, locus where)
10063 gcc_assert (t1->specific && t2->specific);
10064 gcc_assert (!t1->specific->is_generic);
10065 gcc_assert (!t2->specific->is_generic);
10067 sym1 = t1->specific->u.specific->n.sym;
10068 sym2 = t2->specific->u.specific->n.sym;
10073 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10074 if (sym1->attr.subroutine != sym2->attr.subroutine
10075 || sym1->attr.function != sym2->attr.function)
10077 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10078 " GENERIC '%s' at %L",
10079 sym1->name, sym2->name, generic_name, &where);
10083 /* Compare the interfaces. */
10084 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10086 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10087 sym1->name, sym2->name, generic_name, &where);
10095 /* Worker function for resolving a generic procedure binding; this is used to
10096 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10098 The difference between those cases is finding possible inherited bindings
10099 that are overridden, as one has to look for them in tb_sym_root,
10100 tb_uop_root or tb_op, respectively. Thus the caller must already find
10101 the super-type and set p->overridden correctly. */
10104 resolve_tb_generic_targets (gfc_symbol* super_type,
10105 gfc_typebound_proc* p, const char* name)
10107 gfc_tbp_generic* target;
10108 gfc_symtree* first_target;
10109 gfc_symtree* inherited;
10111 gcc_assert (p && p->is_generic);
10113 /* Try to find the specific bindings for the symtrees in our target-list. */
10114 gcc_assert (p->u.generic);
10115 for (target = p->u.generic; target; target = target->next)
10116 if (!target->specific)
10118 gfc_typebound_proc* overridden_tbp;
10119 gfc_tbp_generic* g;
10120 const char* target_name;
10122 target_name = target->specific_st->name;
10124 /* Defined for this type directly. */
10125 if (target->specific_st->n.tb)
10127 target->specific = target->specific_st->n.tb;
10128 goto specific_found;
10131 /* Look for an inherited specific binding. */
10134 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10139 gcc_assert (inherited->n.tb);
10140 target->specific = inherited->n.tb;
10141 goto specific_found;
10145 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10146 " at %L", target_name, name, &p->where);
10149 /* Once we've found the specific binding, check it is not ambiguous with
10150 other specifics already found or inherited for the same GENERIC. */
10152 gcc_assert (target->specific);
10154 /* This must really be a specific binding! */
10155 if (target->specific->is_generic)
10157 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10158 " '%s' is GENERIC, too", name, &p->where, target_name);
10162 /* Check those already resolved on this type directly. */
10163 for (g = p->u.generic; g; g = g->next)
10164 if (g != target && g->specific
10165 && check_generic_tbp_ambiguity (target, g, name, p->where)
10169 /* Check for ambiguity with inherited specific targets. */
10170 for (overridden_tbp = p->overridden; overridden_tbp;
10171 overridden_tbp = overridden_tbp->overridden)
10172 if (overridden_tbp->is_generic)
10174 for (g = overridden_tbp->u.generic; g; g = g->next)
10176 gcc_assert (g->specific);
10177 if (check_generic_tbp_ambiguity (target, g,
10178 name, p->where) == FAILURE)
10184 /* If we attempt to "overwrite" a specific binding, this is an error. */
10185 if (p->overridden && !p->overridden->is_generic)
10187 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10188 " the same name", name, &p->where);
10192 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10193 all must have the same attributes here. */
10194 first_target = p->u.generic->specific->u.specific;
10195 gcc_assert (first_target);
10196 p->subroutine = first_target->n.sym->attr.subroutine;
10197 p->function = first_target->n.sym->attr.function;
10203 /* Resolve a GENERIC procedure binding for a derived type. */
10206 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10208 gfc_symbol* super_type;
10210 /* Find the overridden binding if any. */
10211 st->n.tb->overridden = NULL;
10212 super_type = gfc_get_derived_super_type (derived);
10215 gfc_symtree* overridden;
10216 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10219 if (overridden && overridden->n.tb)
10220 st->n.tb->overridden = overridden->n.tb;
10223 /* Resolve using worker function. */
10224 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10228 /* Retrieve the target-procedure of an operator binding and do some checks in
10229 common for intrinsic and user-defined type-bound operators. */
10232 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10234 gfc_symbol* target_proc;
10236 gcc_assert (target->specific && !target->specific->is_generic);
10237 target_proc = target->specific->u.specific->n.sym;
10238 gcc_assert (target_proc);
10240 /* All operator bindings must have a passed-object dummy argument. */
10241 if (target->specific->nopass)
10243 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10247 return target_proc;
10251 /* Resolve a type-bound intrinsic operator. */
10254 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10255 gfc_typebound_proc* p)
10257 gfc_symbol* super_type;
10258 gfc_tbp_generic* target;
10260 /* If there's already an error here, do nothing (but don't fail again). */
10264 /* Operators should always be GENERIC bindings. */
10265 gcc_assert (p->is_generic);
10267 /* Look for an overridden binding. */
10268 super_type = gfc_get_derived_super_type (derived);
10269 if (super_type && super_type->f2k_derived)
10270 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
10273 p->overridden = NULL;
10275 /* Resolve general GENERIC properties using worker function. */
10276 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
10279 /* Check the targets to be procedures of correct interface. */
10280 for (target = p->u.generic; target; target = target->next)
10282 gfc_symbol* target_proc;
10284 target_proc = get_checked_tb_operator_target (target, p->where);
10288 if (!gfc_check_operator_interface (target_proc, op, p->where))
10300 /* Resolve a type-bound user operator (tree-walker callback). */
10302 static gfc_symbol* resolve_bindings_derived;
10303 static gfc_try resolve_bindings_result;
10305 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
10308 resolve_typebound_user_op (gfc_symtree* stree)
10310 gfc_symbol* super_type;
10311 gfc_tbp_generic* target;
10313 gcc_assert (stree && stree->n.tb);
10315 if (stree->n.tb->error)
10318 /* Operators should always be GENERIC bindings. */
10319 gcc_assert (stree->n.tb->is_generic);
10321 /* Find overridden procedure, if any. */
10322 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10323 if (super_type && super_type->f2k_derived)
10325 gfc_symtree* overridden;
10326 overridden = gfc_find_typebound_user_op (super_type, NULL,
10327 stree->name, true, NULL);
10329 if (overridden && overridden->n.tb)
10330 stree->n.tb->overridden = overridden->n.tb;
10333 stree->n.tb->overridden = NULL;
10335 /* Resolve basically using worker function. */
10336 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10340 /* Check the targets to be functions of correct interface. */
10341 for (target = stree->n.tb->u.generic; target; target = target->next)
10343 gfc_symbol* target_proc;
10345 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10349 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10356 resolve_bindings_result = FAILURE;
10357 stree->n.tb->error = 1;
10361 /* Resolve the type-bound procedures for a derived type. */
10364 resolve_typebound_procedure (gfc_symtree* stree)
10368 gfc_symbol* me_arg;
10369 gfc_symbol* super_type;
10370 gfc_component* comp;
10372 gcc_assert (stree);
10374 /* Undefined specific symbol from GENERIC target definition. */
10378 if (stree->n.tb->error)
10381 /* If this is a GENERIC binding, use that routine. */
10382 if (stree->n.tb->is_generic)
10384 if (resolve_typebound_generic (resolve_bindings_derived, stree)
10390 /* Get the target-procedure to check it. */
10391 gcc_assert (!stree->n.tb->is_generic);
10392 gcc_assert (stree->n.tb->u.specific);
10393 proc = stree->n.tb->u.specific->n.sym;
10394 where = stree->n.tb->where;
10396 /* Default access should already be resolved from the parser. */
10397 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
10399 /* It should be a module procedure or an external procedure with explicit
10400 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
10401 if ((!proc->attr.subroutine && !proc->attr.function)
10402 || (proc->attr.proc != PROC_MODULE
10403 && proc->attr.if_source != IFSRC_IFBODY)
10404 || (proc->attr.abstract && !stree->n.tb->deferred))
10406 gfc_error ("'%s' must be a module procedure or an external procedure with"
10407 " an explicit interface at %L", proc->name, &where);
10410 stree->n.tb->subroutine = proc->attr.subroutine;
10411 stree->n.tb->function = proc->attr.function;
10413 /* Find the super-type of the current derived type. We could do this once and
10414 store in a global if speed is needed, but as long as not I believe this is
10415 more readable and clearer. */
10416 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10418 /* If PASS, resolve and check arguments if not already resolved / loaded
10419 from a .mod file. */
10420 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
10422 if (stree->n.tb->pass_arg)
10424 gfc_formal_arglist* i;
10426 /* If an explicit passing argument name is given, walk the arg-list
10427 and look for it. */
10430 stree->n.tb->pass_arg_num = 1;
10431 for (i = proc->formal; i; i = i->next)
10433 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
10438 ++stree->n.tb->pass_arg_num;
10443 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
10445 proc->name, stree->n.tb->pass_arg, &where,
10446 stree->n.tb->pass_arg);
10452 /* Otherwise, take the first one; there should in fact be at least
10454 stree->n.tb->pass_arg_num = 1;
10457 gfc_error ("Procedure '%s' with PASS at %L must have at"
10458 " least one argument", proc->name, &where);
10461 me_arg = proc->formal->sym;
10464 /* Now check that the argument-type matches and the passed-object
10465 dummy argument is generally fine. */
10467 gcc_assert (me_arg);
10469 if (me_arg->ts.type != BT_CLASS)
10471 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10472 " at %L", proc->name, &where);
10476 if (me_arg->ts.u.derived->components->ts.u.derived
10477 != resolve_bindings_derived)
10479 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10480 " the derived-type '%s'", me_arg->name, proc->name,
10481 me_arg->name, &where, resolve_bindings_derived->name);
10485 gcc_assert (me_arg->ts.type == BT_CLASS);
10486 if (me_arg->ts.u.derived->components->as
10487 && me_arg->ts.u.derived->components->as->rank > 0)
10489 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
10490 " scalar", proc->name, &where);
10493 if (me_arg->ts.u.derived->components->attr.allocatable)
10495 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10496 " be ALLOCATABLE", proc->name, &where);
10499 if (me_arg->ts.u.derived->components->attr.class_pointer)
10501 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10502 " be POINTER", proc->name, &where);
10507 /* If we are extending some type, check that we don't override a procedure
10508 flagged NON_OVERRIDABLE. */
10509 stree->n.tb->overridden = NULL;
10512 gfc_symtree* overridden;
10513 overridden = gfc_find_typebound_proc (super_type, NULL,
10514 stree->name, true, NULL);
10516 if (overridden && overridden->n.tb)
10517 stree->n.tb->overridden = overridden->n.tb;
10519 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
10523 /* See if there's a name collision with a component directly in this type. */
10524 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
10525 if (!strcmp (comp->name, stree->name))
10527 gfc_error ("Procedure '%s' at %L has the same name as a component of"
10529 stree->name, &where, resolve_bindings_derived->name);
10533 /* Try to find a name collision with an inherited component. */
10534 if (super_type && gfc_find_component (super_type, stree->name, true, true))
10536 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
10537 " component of '%s'",
10538 stree->name, &where, resolve_bindings_derived->name);
10542 stree->n.tb->error = 0;
10546 resolve_bindings_result = FAILURE;
10547 stree->n.tb->error = 1;
10551 resolve_typebound_procedures (gfc_symbol* derived)
10555 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10558 resolve_bindings_derived = derived;
10559 resolve_bindings_result = SUCCESS;
10561 if (derived->f2k_derived->tb_sym_root)
10562 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10563 &resolve_typebound_procedure);
10565 if (derived->f2k_derived->tb_uop_root)
10566 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10567 &resolve_typebound_user_op);
10569 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10571 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10572 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10574 resolve_bindings_result = FAILURE;
10577 return resolve_bindings_result;
10581 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10582 to give all identical derived types the same backend_decl. */
10584 add_dt_to_dt_list (gfc_symbol *derived)
10586 gfc_dt_list *dt_list;
10588 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10589 if (derived == dt_list->derived)
10592 if (dt_list == NULL)
10594 dt_list = gfc_get_dt_list ();
10595 dt_list->next = gfc_derived_types;
10596 dt_list->derived = derived;
10597 gfc_derived_types = dt_list;
10602 /* Ensure that a derived-type is really not abstract, meaning that every
10603 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10606 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10611 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10613 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10616 if (st->n.tb && st->n.tb->deferred)
10618 gfc_symtree* overriding;
10619 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10620 gcc_assert (overriding && overriding->n.tb);
10621 if (overriding->n.tb->deferred)
10623 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10624 " '%s' is DEFERRED and not overridden",
10625 sub->name, &sub->declared_at, st->name);
10634 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10636 /* The algorithm used here is to recursively travel up the ancestry of sub
10637 and for each ancestor-type, check all bindings. If any of them is
10638 DEFERRED, look it up starting from sub and see if the found (overriding)
10639 binding is not DEFERRED.
10640 This is not the most efficient way to do this, but it should be ok and is
10641 clearer than something sophisticated. */
10643 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
10645 /* Walk bindings of this ancestor. */
10646 if (ancestor->f2k_derived)
10649 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10654 /* Find next ancestor type and recurse on it. */
10655 ancestor = gfc_get_derived_super_type (ancestor);
10657 return ensure_not_abstract (sub, ancestor);
10663 static void resolve_symbol (gfc_symbol *sym);
10666 /* Resolve the components of a derived type. */
10669 resolve_fl_derived (gfc_symbol *sym)
10671 gfc_symbol* super_type;
10675 super_type = gfc_get_derived_super_type (sym);
10678 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
10680 gfc_error ("As extending type '%s' at %L has a coarray component, "
10681 "parent type '%s' shall also have one", sym->name,
10682 &sym->declared_at, super_type->name);
10686 /* Ensure the extended type gets resolved before we do. */
10687 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10690 /* An ABSTRACT type must be extensible. */
10691 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10693 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10694 sym->name, &sym->declared_at);
10698 for (c = sym->components; c != NULL; c = c->next)
10701 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
10702 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
10704 gfc_error ("Coarray component '%s' at %L must be allocatable with "
10705 "deferred shape", c->name, &c->loc);
10710 if (c->attr.codimension && c->ts.type == BT_DERIVED
10711 && c->ts.u.derived->ts.is_iso_c)
10713 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
10714 "shall not be a coarray", c->name, &c->loc);
10719 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
10720 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
10721 || c->attr.allocatable))
10723 gfc_error ("Component '%s' at %L with coarray component "
10724 "shall be a nonpointer, nonallocatable scalar",
10729 if (c->attr.proc_pointer && c->ts.interface)
10731 if (c->ts.interface->attr.procedure)
10732 gfc_error ("Interface '%s', used by procedure pointer component "
10733 "'%s' at %L, is declared in a later PROCEDURE statement",
10734 c->ts.interface->name, c->name, &c->loc);
10736 /* Get the attributes from the interface (now resolved). */
10737 if (c->ts.interface->attr.if_source
10738 || c->ts.interface->attr.intrinsic)
10740 gfc_symbol *ifc = c->ts.interface;
10742 if (ifc->formal && !ifc->formal_ns)
10743 resolve_symbol (ifc);
10745 if (ifc->attr.intrinsic)
10746 resolve_intrinsic (ifc, &ifc->declared_at);
10750 c->ts = ifc->result->ts;
10751 c->attr.allocatable = ifc->result->attr.allocatable;
10752 c->attr.pointer = ifc->result->attr.pointer;
10753 c->attr.dimension = ifc->result->attr.dimension;
10754 c->as = gfc_copy_array_spec (ifc->result->as);
10759 c->attr.allocatable = ifc->attr.allocatable;
10760 c->attr.pointer = ifc->attr.pointer;
10761 c->attr.dimension = ifc->attr.dimension;
10762 c->as = gfc_copy_array_spec (ifc->as);
10764 c->ts.interface = ifc;
10765 c->attr.function = ifc->attr.function;
10766 c->attr.subroutine = ifc->attr.subroutine;
10767 gfc_copy_formal_args_ppc (c, ifc);
10769 c->attr.pure = ifc->attr.pure;
10770 c->attr.elemental = ifc->attr.elemental;
10771 c->attr.recursive = ifc->attr.recursive;
10772 c->attr.always_explicit = ifc->attr.always_explicit;
10773 c->attr.ext_attr |= ifc->attr.ext_attr;
10774 /* Replace symbols in array spec. */
10778 for (i = 0; i < c->as->rank; i++)
10780 gfc_expr_replace_comp (c->as->lower[i], c);
10781 gfc_expr_replace_comp (c->as->upper[i], c);
10784 /* Copy char length. */
10785 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10787 c->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10788 gfc_expr_replace_comp (c->ts.u.cl->length, c);
10791 else if (c->ts.interface->name[0] != '\0')
10793 gfc_error ("Interface '%s' of procedure pointer component "
10794 "'%s' at %L must be explicit", c->ts.interface->name,
10799 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10801 /* Since PPCs are not implicitly typed, a PPC without an explicit
10802 interface must be a subroutine. */
10803 gfc_add_subroutine (&c->attr, c->name, &c->loc);
10806 /* Procedure pointer components: Check PASS arg. */
10807 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0)
10809 gfc_symbol* me_arg;
10811 if (c->tb->pass_arg)
10813 gfc_formal_arglist* i;
10815 /* If an explicit passing argument name is given, walk the arg-list
10816 and look for it. */
10819 c->tb->pass_arg_num = 1;
10820 for (i = c->formal; i; i = i->next)
10822 if (!strcmp (i->sym->name, c->tb->pass_arg))
10827 c->tb->pass_arg_num++;
10832 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10833 "at %L has no argument '%s'", c->name,
10834 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10841 /* Otherwise, take the first one; there should in fact be at least
10843 c->tb->pass_arg_num = 1;
10846 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10847 "must have at least one argument",
10852 me_arg = c->formal->sym;
10855 /* Now check that the argument-type matches. */
10856 gcc_assert (me_arg);
10857 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10858 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10859 || (me_arg->ts.type == BT_CLASS
10860 && me_arg->ts.u.derived->components->ts.u.derived != sym))
10862 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10863 " the derived type '%s'", me_arg->name, c->name,
10864 me_arg->name, &c->loc, sym->name);
10869 /* Check for C453. */
10870 if (me_arg->attr.dimension)
10872 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10873 "must be scalar", me_arg->name, c->name, me_arg->name,
10879 if (me_arg->attr.pointer)
10881 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10882 "may not have the POINTER attribute", me_arg->name,
10883 c->name, me_arg->name, &c->loc);
10888 if (me_arg->attr.allocatable)
10890 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10891 "may not be ALLOCATABLE", me_arg->name, c->name,
10892 me_arg->name, &c->loc);
10897 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
10898 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10899 " at %L", c->name, &c->loc);
10903 /* Check type-spec if this is not the parent-type component. */
10904 if ((!sym->attr.extension || c != sym->components)
10905 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
10908 /* If this type is an extension, set the accessibility of the parent
10910 if (super_type && c == sym->components
10911 && strcmp (super_type->name, c->name) == 0)
10912 c->attr.access = super_type->attr.access;
10914 /* If this type is an extension, see if this component has the same name
10915 as an inherited type-bound procedure. */
10917 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
10919 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
10920 " inherited type-bound procedure",
10921 c->name, sym->name, &c->loc);
10925 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
10927 if (c->ts.u.cl->length == NULL
10928 || (resolve_charlen (c->ts.u.cl) == FAILURE)
10929 || !gfc_is_constant_expr (c->ts.u.cl->length))
10931 gfc_error ("Character length of component '%s' needs to "
10932 "be a constant specification expression at %L",
10934 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
10939 if (c->ts.type == BT_DERIVED
10940 && sym->component_access != ACCESS_PRIVATE
10941 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10942 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
10943 && !c->ts.u.derived->attr.use_assoc
10944 && !gfc_check_access (c->ts.u.derived->attr.access,
10945 c->ts.u.derived->ns->default_access)
10946 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
10947 "is a PRIVATE type and cannot be a component of "
10948 "'%s', which is PUBLIC at %L", c->name,
10949 sym->name, &sym->declared_at) == FAILURE)
10952 if (sym->attr.sequence)
10954 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
10956 gfc_error ("Component %s of SEQUENCE type declared at %L does "
10957 "not have the SEQUENCE attribute",
10958 c->ts.u.derived->name, &sym->declared_at);
10963 if (c->ts.type == BT_DERIVED && c->attr.pointer
10964 && c->ts.u.derived->components == NULL
10965 && !c->ts.u.derived->attr.zero_comp)
10967 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10968 "that has not been declared", c->name, sym->name,
10974 if (c->ts.type == BT_CLASS
10975 && !(c->ts.u.derived->components->attr.pointer
10976 || c->ts.u.derived->components->attr.allocatable))
10978 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
10979 "or pointer", c->name, &c->loc);
10983 /* Ensure that all the derived type components are put on the
10984 derived type list; even in formal namespaces, where derived type
10985 pointer components might not have been declared. */
10986 if (c->ts.type == BT_DERIVED
10988 && c->ts.u.derived->components
10990 && sym != c->ts.u.derived)
10991 add_dt_to_dt_list (c->ts.u.derived);
10993 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
10997 for (i = 0; i < c->as->rank; i++)
10999 if (c->as->lower[i] == NULL
11000 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
11001 || !gfc_is_constant_expr (c->as->lower[i])
11002 || c->as->upper[i] == NULL
11003 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
11004 || !gfc_is_constant_expr (c->as->upper[i]))
11006 gfc_error ("Component '%s' of '%s' at %L must have "
11007 "constant array bounds",
11008 c->name, sym->name, &c->loc);
11014 /* Resolve the type-bound procedures. */
11015 if (resolve_typebound_procedures (sym) == FAILURE)
11018 /* Resolve the finalizer procedures. */
11019 if (gfc_resolve_finalizers (sym) == FAILURE)
11022 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11023 all DEFERRED bindings are overridden. */
11024 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11025 && ensure_not_abstract (sym, super_type) == FAILURE)
11028 /* Add derived type to the derived type list. */
11029 add_dt_to_dt_list (sym);
11036 resolve_fl_namelist (gfc_symbol *sym)
11041 /* Reject PRIVATE objects in a PUBLIC namelist. */
11042 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
11044 for (nl = sym->namelist; nl; nl = nl->next)
11046 if (!nl->sym->attr.use_assoc
11047 && !is_sym_host_assoc (nl->sym, sym->ns)
11048 && !gfc_check_access(nl->sym->attr.access,
11049 nl->sym->ns->default_access))
11051 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11052 "cannot be member of PUBLIC namelist '%s' at %L",
11053 nl->sym->name, sym->name, &sym->declared_at);
11057 /* Types with private components that came here by USE-association. */
11058 if (nl->sym->ts.type == BT_DERIVED
11059 && derived_inaccessible (nl->sym->ts.u.derived))
11061 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11062 "components and cannot be member of namelist '%s' at %L",
11063 nl->sym->name, sym->name, &sym->declared_at);
11067 /* Types with private components that are defined in the same module. */
11068 if (nl->sym->ts.type == BT_DERIVED
11069 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11070 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
11071 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
11072 nl->sym->ns->default_access))
11074 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11075 "cannot be a member of PUBLIC namelist '%s' at %L",
11076 nl->sym->name, sym->name, &sym->declared_at);
11082 for (nl = sym->namelist; nl; nl = nl->next)
11084 /* Reject namelist arrays of assumed shape. */
11085 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11086 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
11087 "must not have assumed shape in namelist "
11088 "'%s' at %L", nl->sym->name, sym->name,
11089 &sym->declared_at) == FAILURE)
11092 /* Reject namelist arrays that are not constant shape. */
11093 if (is_non_constant_shape_array (nl->sym))
11095 gfc_error ("NAMELIST array object '%s' must have constant "
11096 "shape in namelist '%s' at %L", nl->sym->name,
11097 sym->name, &sym->declared_at);
11101 /* Namelist objects cannot have allocatable or pointer components. */
11102 if (nl->sym->ts.type != BT_DERIVED)
11105 if (nl->sym->ts.u.derived->attr.alloc_comp)
11107 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11108 "have ALLOCATABLE components",
11109 nl->sym->name, sym->name, &sym->declared_at);
11113 if (nl->sym->ts.u.derived->attr.pointer_comp)
11115 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11116 "have POINTER components",
11117 nl->sym->name, sym->name, &sym->declared_at);
11123 /* 14.1.2 A module or internal procedure represent local entities
11124 of the same type as a namelist member and so are not allowed. */
11125 for (nl = sym->namelist; nl; nl = nl->next)
11127 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11130 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11131 if ((nl->sym == sym->ns->proc_name)
11133 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11137 if (nl->sym && nl->sym->name)
11138 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11139 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11141 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11142 "attribute in '%s' at %L", nlsym->name,
11143 &sym->declared_at);
11153 resolve_fl_parameter (gfc_symbol *sym)
11155 /* A parameter array's shape needs to be constant. */
11156 if (sym->as != NULL
11157 && (sym->as->type == AS_DEFERRED
11158 || is_non_constant_shape_array (sym)))
11160 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11161 "or of deferred shape", sym->name, &sym->declared_at);
11165 /* Make sure a parameter that has been implicitly typed still
11166 matches the implicit type, since PARAMETER statements can precede
11167 IMPLICIT statements. */
11168 if (sym->attr.implicit_type
11169 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11172 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11173 "later IMPLICIT type", sym->name, &sym->declared_at);
11177 /* Make sure the types of derived parameters are consistent. This
11178 type checking is deferred until resolution because the type may
11179 refer to a derived type from the host. */
11180 if (sym->ts.type == BT_DERIVED
11181 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11183 gfc_error ("Incompatible derived type in PARAMETER at %L",
11184 &sym->value->where);
11191 /* Do anything necessary to resolve a symbol. Right now, we just
11192 assume that an otherwise unknown symbol is a variable. This sort
11193 of thing commonly happens for symbols in module. */
11196 resolve_symbol (gfc_symbol *sym)
11198 int check_constant, mp_flag;
11199 gfc_symtree *symtree;
11200 gfc_symtree *this_symtree;
11204 if (sym->attr.flavor == FL_UNKNOWN)
11207 /* If we find that a flavorless symbol is an interface in one of the
11208 parent namespaces, find its symtree in this namespace, free the
11209 symbol and set the symtree to point to the interface symbol. */
11210 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
11212 symtree = gfc_find_symtree (ns->sym_root, sym->name);
11213 if (symtree && symtree->n.sym->generic)
11215 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
11219 gfc_free_symbol (sym);
11220 symtree->n.sym->refs++;
11221 this_symtree->n.sym = symtree->n.sym;
11226 /* Otherwise give it a flavor according to such attributes as
11228 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
11229 sym->attr.flavor = FL_VARIABLE;
11232 sym->attr.flavor = FL_PROCEDURE;
11233 if (sym->attr.dimension)
11234 sym->attr.function = 1;
11238 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
11239 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
11241 if (sym->attr.procedure && sym->ts.interface
11242 && sym->attr.if_source != IFSRC_DECL)
11244 if (sym->ts.interface == sym)
11246 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
11247 "interface", sym->name, &sym->declared_at);
11250 if (sym->ts.interface->attr.procedure)
11252 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
11253 " in a later PROCEDURE statement", sym->ts.interface->name,
11254 sym->name,&sym->declared_at);
11258 /* Get the attributes from the interface (now resolved). */
11259 if (sym->ts.interface->attr.if_source
11260 || sym->ts.interface->attr.intrinsic)
11262 gfc_symbol *ifc = sym->ts.interface;
11263 resolve_symbol (ifc);
11265 if (ifc->attr.intrinsic)
11266 resolve_intrinsic (ifc, &ifc->declared_at);
11269 sym->ts = ifc->result->ts;
11272 sym->ts.interface = ifc;
11273 sym->attr.function = ifc->attr.function;
11274 sym->attr.subroutine = ifc->attr.subroutine;
11275 gfc_copy_formal_args (sym, ifc);
11277 sym->attr.allocatable = ifc->attr.allocatable;
11278 sym->attr.pointer = ifc->attr.pointer;
11279 sym->attr.pure = ifc->attr.pure;
11280 sym->attr.elemental = ifc->attr.elemental;
11281 sym->attr.dimension = ifc->attr.dimension;
11282 sym->attr.recursive = ifc->attr.recursive;
11283 sym->attr.always_explicit = ifc->attr.always_explicit;
11284 sym->attr.ext_attr |= ifc->attr.ext_attr;
11285 /* Copy array spec. */
11286 sym->as = gfc_copy_array_spec (ifc->as);
11290 for (i = 0; i < sym->as->rank; i++)
11292 gfc_expr_replace_symbols (sym->as->lower[i], sym);
11293 gfc_expr_replace_symbols (sym->as->upper[i], sym);
11296 /* Copy char length. */
11297 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11299 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11300 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
11303 else if (sym->ts.interface->name[0] != '\0')
11305 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
11306 sym->ts.interface->name, sym->name, &sym->declared_at);
11311 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
11314 /* Symbols that are module procedures with results (functions) have
11315 the types and array specification copied for type checking in
11316 procedures that call them, as well as for saving to a module
11317 file. These symbols can't stand the scrutiny that their results
11319 mp_flag = (sym->result != NULL && sym->result != sym);
11322 /* Make sure that the intrinsic is consistent with its internal
11323 representation. This needs to be done before assigning a default
11324 type to avoid spurious warnings. */
11325 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
11326 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
11329 /* Assign default type to symbols that need one and don't have one. */
11330 if (sym->ts.type == BT_UNKNOWN)
11332 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
11333 gfc_set_default_type (sym, 1, NULL);
11335 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
11336 && !sym->attr.function && !sym->attr.subroutine
11337 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
11338 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
11340 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
11342 /* The specific case of an external procedure should emit an error
11343 in the case that there is no implicit type. */
11345 gfc_set_default_type (sym, sym->attr.external, NULL);
11348 /* Result may be in another namespace. */
11349 resolve_symbol (sym->result);
11351 if (!sym->result->attr.proc_pointer)
11353 sym->ts = sym->result->ts;
11354 sym->as = gfc_copy_array_spec (sym->result->as);
11355 sym->attr.dimension = sym->result->attr.dimension;
11356 sym->attr.pointer = sym->result->attr.pointer;
11357 sym->attr.allocatable = sym->result->attr.allocatable;
11363 /* Assumed size arrays and assumed shape arrays must be dummy
11366 if (sym->as != NULL
11367 && ((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
11368 || sym->as->type == AS_ASSUMED_SHAPE)
11369 && sym->attr.dummy == 0)
11371 if (sym->as->type == AS_ASSUMED_SIZE)
11372 gfc_error ("Assumed size array at %L must be a dummy argument",
11373 &sym->declared_at);
11375 gfc_error ("Assumed shape array at %L must be a dummy argument",
11376 &sym->declared_at);
11380 /* Make sure symbols with known intent or optional are really dummy
11381 variable. Because of ENTRY statement, this has to be deferred
11382 until resolution time. */
11384 if (!sym->attr.dummy
11385 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
11387 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
11391 if (sym->attr.value && !sym->attr.dummy)
11393 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
11394 "it is not a dummy argument", sym->name, &sym->declared_at);
11398 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
11400 gfc_charlen *cl = sym->ts.u.cl;
11401 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
11403 gfc_error ("Character dummy variable '%s' at %L with VALUE "
11404 "attribute must have constant length",
11405 sym->name, &sym->declared_at);
11409 if (sym->ts.is_c_interop
11410 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
11412 gfc_error ("C interoperable character dummy variable '%s' at %L "
11413 "with VALUE attribute must have length one",
11414 sym->name, &sym->declared_at);
11419 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
11420 do this for something that was implicitly typed because that is handled
11421 in gfc_set_default_type. Handle dummy arguments and procedure
11422 definitions separately. Also, anything that is use associated is not
11423 handled here but instead is handled in the module it is declared in.
11424 Finally, derived type definitions are allowed to be BIND(C) since that
11425 only implies that they're interoperable, and they are checked fully for
11426 interoperability when a variable is declared of that type. */
11427 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
11428 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
11429 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
11431 gfc_try t = SUCCESS;
11433 /* First, make sure the variable is declared at the
11434 module-level scope (J3/04-007, Section 15.3). */
11435 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
11436 sym->attr.in_common == 0)
11438 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
11439 "is neither a COMMON block nor declared at the "
11440 "module level scope", sym->name, &(sym->declared_at));
11443 else if (sym->common_head != NULL)
11445 t = verify_com_block_vars_c_interop (sym->common_head);
11449 /* If type() declaration, we need to verify that the components
11450 of the given type are all C interoperable, etc. */
11451 if (sym->ts.type == BT_DERIVED &&
11452 sym->ts.u.derived->attr.is_c_interop != 1)
11454 /* Make sure the user marked the derived type as BIND(C). If
11455 not, call the verify routine. This could print an error
11456 for the derived type more than once if multiple variables
11457 of that type are declared. */
11458 if (sym->ts.u.derived->attr.is_bind_c != 1)
11459 verify_bind_c_derived_type (sym->ts.u.derived);
11463 /* Verify the variable itself as C interoperable if it
11464 is BIND(C). It is not possible for this to succeed if
11465 the verify_bind_c_derived_type failed, so don't have to handle
11466 any error returned by verify_bind_c_derived_type. */
11467 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
11468 sym->common_block);
11473 /* clear the is_bind_c flag to prevent reporting errors more than
11474 once if something failed. */
11475 sym->attr.is_bind_c = 0;
11480 /* If a derived type symbol has reached this point, without its
11481 type being declared, we have an error. Notice that most
11482 conditions that produce undefined derived types have already
11483 been dealt with. However, the likes of:
11484 implicit type(t) (t) ..... call foo (t) will get us here if
11485 the type is not declared in the scope of the implicit
11486 statement. Change the type to BT_UNKNOWN, both because it is so
11487 and to prevent an ICE. */
11488 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
11489 && !sym->ts.u.derived->attr.zero_comp)
11491 gfc_error ("The derived type '%s' at %L is of type '%s', "
11492 "which has not been defined", sym->name,
11493 &sym->declared_at, sym->ts.u.derived->name);
11494 sym->ts.type = BT_UNKNOWN;
11498 /* Make sure that the derived type has been resolved and that the
11499 derived type is visible in the symbol's namespace, if it is a
11500 module function and is not PRIVATE. */
11501 if (sym->ts.type == BT_DERIVED
11502 && sym->ts.u.derived->attr.use_assoc
11503 && sym->ns->proc_name
11504 && sym->ns->proc_name->attr.flavor == FL_MODULE)
11508 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
11511 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
11512 if (!ds && sym->attr.function
11513 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11515 symtree = gfc_new_symtree (&sym->ns->sym_root,
11516 sym->ts.u.derived->name);
11517 symtree->n.sym = sym->ts.u.derived;
11518 sym->ts.u.derived->refs++;
11522 /* Unless the derived-type declaration is use associated, Fortran 95
11523 does not allow public entries of private derived types.
11524 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
11525 161 in 95-006r3. */
11526 if (sym->ts.type == BT_DERIVED
11527 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
11528 && !sym->ts.u.derived->attr.use_assoc
11529 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11530 && !gfc_check_access (sym->ts.u.derived->attr.access,
11531 sym->ts.u.derived->ns->default_access)
11532 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
11533 "of PRIVATE derived type '%s'",
11534 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
11535 : "variable", sym->name, &sym->declared_at,
11536 sym->ts.u.derived->name) == FAILURE)
11539 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
11540 default initialization is defined (5.1.2.4.4). */
11541 if (sym->ts.type == BT_DERIVED
11543 && sym->attr.intent == INTENT_OUT
11545 && sym->as->type == AS_ASSUMED_SIZE)
11547 for (c = sym->ts.u.derived->components; c; c = c->next)
11549 if (c->initializer)
11551 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
11552 "ASSUMED SIZE and so cannot have a default initializer",
11553 sym->name, &sym->declared_at);
11560 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11561 || sym->attr.codimension)
11562 && sym->attr.result)
11563 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
11564 "a coarray component", sym->name, &sym->declared_at);
11567 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
11568 && sym->ts.u.derived->ts.is_iso_c)
11569 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11570 "shall not be a coarray", sym->name, &sym->declared_at);
11573 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
11574 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
11575 || sym->attr.allocatable))
11576 gfc_error ("Variable '%s' at %L with coarray component "
11577 "shall be a nonpointer, nonallocatable scalar",
11578 sym->name, &sym->declared_at);
11580 /* F2008, C526. The function-result case was handled above. */
11581 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11582 || sym->attr.codimension)
11583 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
11584 || sym->ns->proc_name->attr.flavor == FL_MODULE
11585 || sym->ns->proc_name->attr.is_main_program
11586 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
11587 gfc_error ("Variable '%s' at %L is a coarray or has a coarray "
11588 "component and is not ALLOCATABLE, SAVE nor a "
11589 "dummy argument", sym->name, &sym->declared_at);
11590 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
11591 else if (sym->attr.codimension && !sym->attr.allocatable
11592 && sym->as && sym->as->cotype == AS_DEFERRED)
11593 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
11594 "deferred shape", sym->name, &sym->declared_at);
11595 else if (sym->attr.codimension && sym->attr.allocatable
11596 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
11597 gfc_error ("Allocatable coarray variable '%s' at %L must have "
11598 "deferred shape", sym->name, &sym->declared_at);
11602 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11603 || (sym->attr.codimension && sym->attr.allocatable))
11604 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
11605 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
11606 "allocatable coarray or have coarray components",
11607 sym->name, &sym->declared_at);
11609 if (sym->attr.codimension && sym->attr.dummy
11610 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
11611 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
11612 "procedure '%s'", sym->name, &sym->declared_at,
11613 sym->ns->proc_name->name);
11615 switch (sym->attr.flavor)
11618 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
11623 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
11628 if (resolve_fl_namelist (sym) == FAILURE)
11633 if (resolve_fl_parameter (sym) == FAILURE)
11641 /* Resolve array specifier. Check as well some constraints
11642 on COMMON blocks. */
11644 check_constant = sym->attr.in_common && !sym->attr.pointer;
11646 /* Set the formal_arg_flag so that check_conflict will not throw
11647 an error for host associated variables in the specification
11648 expression for an array_valued function. */
11649 if (sym->attr.function && sym->as)
11650 formal_arg_flag = 1;
11652 gfc_resolve_array_spec (sym->as, check_constant);
11654 formal_arg_flag = 0;
11656 /* Resolve formal namespaces. */
11657 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11658 && !sym->attr.contained && !sym->attr.intrinsic)
11659 gfc_resolve (sym->formal_ns);
11661 /* Make sure the formal namespace is present. */
11662 if (sym->formal && !sym->formal_ns)
11664 gfc_formal_arglist *formal = sym->formal;
11665 while (formal && !formal->sym)
11666 formal = formal->next;
11670 sym->formal_ns = formal->sym->ns;
11671 sym->formal_ns->refs++;
11675 /* Check threadprivate restrictions. */
11676 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11677 && (!sym->attr.in_common
11678 && sym->module == NULL
11679 && (sym->ns->proc_name == NULL
11680 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11681 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11683 /* If we have come this far we can apply default-initializers, as
11684 described in 14.7.5, to those variables that have not already
11685 been assigned one. */
11686 if (sym->ts.type == BT_DERIVED
11687 && sym->attr.referenced
11688 && sym->ns == gfc_current_ns
11690 && !sym->attr.allocatable
11691 && !sym->attr.alloc_comp)
11693 symbol_attribute *a = &sym->attr;
11695 if ((!a->save && !a->dummy && !a->pointer
11696 && !a->in_common && !a->use_assoc
11697 && !(a->function && sym != sym->result))
11698 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11699 apply_default_init (sym);
11702 /* If this symbol has a type-spec, check it. */
11703 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11704 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11705 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11711 /************* Resolve DATA statements *************/
11715 gfc_data_value *vnode;
11721 /* Advance the values structure to point to the next value in the data list. */
11724 next_data_value (void)
11726 while (mpz_cmp_ui (values.left, 0) == 0)
11729 if (values.vnode->next == NULL)
11732 values.vnode = values.vnode->next;
11733 mpz_set (values.left, values.vnode->repeat);
11741 check_data_variable (gfc_data_variable *var, locus *where)
11747 ar_type mark = AR_UNKNOWN;
11749 mpz_t section_index[GFC_MAX_DIMENSIONS];
11755 if (gfc_resolve_expr (var->expr) == FAILURE)
11759 mpz_init_set_si (offset, 0);
11762 if (e->expr_type != EXPR_VARIABLE)
11763 gfc_internal_error ("check_data_variable(): Bad expression");
11765 sym = e->symtree->n.sym;
11767 if (sym->ns->is_block_data && !sym->attr.in_common)
11769 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11770 sym->name, &sym->declared_at);
11773 if (e->ref == NULL && sym->as)
11775 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11776 " declaration", sym->name, where);
11780 has_pointer = sym->attr.pointer;
11782 for (ref = e->ref; ref; ref = ref->next)
11784 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11787 if (ref->type == REF_ARRAY && ref->u.ar.codimen)
11789 gfc_error ("DATA element '%s' at %L cannot have a coindex",
11795 && ref->type == REF_ARRAY
11796 && ref->u.ar.type != AR_FULL)
11798 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11799 "be a full array", sym->name, where);
11804 if (e->rank == 0 || has_pointer)
11806 mpz_init_set_ui (size, 1);
11813 /* Find the array section reference. */
11814 for (ref = e->ref; ref; ref = ref->next)
11816 if (ref->type != REF_ARRAY)
11818 if (ref->u.ar.type == AR_ELEMENT)
11824 /* Set marks according to the reference pattern. */
11825 switch (ref->u.ar.type)
11833 /* Get the start position of array section. */
11834 gfc_get_section_index (ar, section_index, &offset);
11839 gcc_unreachable ();
11842 if (gfc_array_size (e, &size) == FAILURE)
11844 gfc_error ("Nonconstant array section at %L in DATA statement",
11846 mpz_clear (offset);
11853 while (mpz_cmp_ui (size, 0) > 0)
11855 if (next_data_value () == FAILURE)
11857 gfc_error ("DATA statement at %L has more variables than values",
11863 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
11867 /* If we have more than one element left in the repeat count,
11868 and we have more than one element left in the target variable,
11869 then create a range assignment. */
11870 /* FIXME: Only done for full arrays for now, since array sections
11872 if (mark == AR_FULL && ref && ref->next == NULL
11873 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
11877 if (mpz_cmp (size, values.left) >= 0)
11879 mpz_init_set (range, values.left);
11880 mpz_sub (size, size, values.left);
11881 mpz_set_ui (values.left, 0);
11885 mpz_init_set (range, size);
11886 mpz_sub (values.left, values.left, size);
11887 mpz_set_ui (size, 0);
11890 gfc_assign_data_value_range (var->expr, values.vnode->expr,
11893 mpz_add (offset, offset, range);
11897 /* Assign initial value to symbol. */
11900 mpz_sub_ui (values.left, values.left, 1);
11901 mpz_sub_ui (size, size, 1);
11903 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
11907 if (mark == AR_FULL)
11908 mpz_add_ui (offset, offset, 1);
11910 /* Modify the array section indexes and recalculate the offset
11911 for next element. */
11912 else if (mark == AR_SECTION)
11913 gfc_advance_section (section_index, ar, &offset);
11917 if (mark == AR_SECTION)
11919 for (i = 0; i < ar->dimen; i++)
11920 mpz_clear (section_index[i]);
11924 mpz_clear (offset);
11930 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
11932 /* Iterate over a list of elements in a DATA statement. */
11935 traverse_data_list (gfc_data_variable *var, locus *where)
11938 iterator_stack frame;
11939 gfc_expr *e, *start, *end, *step;
11940 gfc_try retval = SUCCESS;
11942 mpz_init (frame.value);
11944 start = gfc_copy_expr (var->iter.start);
11945 end = gfc_copy_expr (var->iter.end);
11946 step = gfc_copy_expr (var->iter.step);
11948 if (gfc_simplify_expr (start, 1) == FAILURE
11949 || start->expr_type != EXPR_CONSTANT)
11951 gfc_error ("iterator start at %L does not simplify", &start->where);
11955 if (gfc_simplify_expr (end, 1) == FAILURE
11956 || end->expr_type != EXPR_CONSTANT)
11958 gfc_error ("iterator end at %L does not simplify", &end->where);
11962 if (gfc_simplify_expr (step, 1) == FAILURE
11963 || step->expr_type != EXPR_CONSTANT)
11965 gfc_error ("iterator step at %L does not simplify", &step->where);
11970 mpz_init_set (trip, end->value.integer);
11971 mpz_sub (trip, trip, start->value.integer);
11972 mpz_add (trip, trip, step->value.integer);
11974 mpz_div (trip, trip, step->value.integer);
11976 mpz_set (frame.value, start->value.integer);
11978 frame.prev = iter_stack;
11979 frame.variable = var->iter.var->symtree;
11980 iter_stack = &frame;
11982 while (mpz_cmp_ui (trip, 0) > 0)
11984 if (traverse_data_var (var->list, where) == FAILURE)
11991 e = gfc_copy_expr (var->expr);
11992 if (gfc_simplify_expr (e, 1) == FAILURE)
12000 mpz_add (frame.value, frame.value, step->value.integer);
12002 mpz_sub_ui (trip, trip, 1);
12007 mpz_clear (frame.value);
12009 gfc_free_expr (start);
12010 gfc_free_expr (end);
12011 gfc_free_expr (step);
12013 iter_stack = frame.prev;
12018 /* Type resolve variables in the variable list of a DATA statement. */
12021 traverse_data_var (gfc_data_variable *var, locus *where)
12025 for (; var; var = var->next)
12027 if (var->expr == NULL)
12028 t = traverse_data_list (var, where);
12030 t = check_data_variable (var, where);
12040 /* Resolve the expressions and iterators associated with a data statement.
12041 This is separate from the assignment checking because data lists should
12042 only be resolved once. */
12045 resolve_data_variables (gfc_data_variable *d)
12047 for (; d; d = d->next)
12049 if (d->list == NULL)
12051 if (gfc_resolve_expr (d->expr) == FAILURE)
12056 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12059 if (resolve_data_variables (d->list) == FAILURE)
12068 /* Resolve a single DATA statement. We implement this by storing a pointer to
12069 the value list into static variables, and then recursively traversing the
12070 variables list, expanding iterators and such. */
12073 resolve_data (gfc_data *d)
12076 if (resolve_data_variables (d->var) == FAILURE)
12079 values.vnode = d->value;
12080 if (d->value == NULL)
12081 mpz_set_ui (values.left, 0);
12083 mpz_set (values.left, d->value->repeat);
12085 if (traverse_data_var (d->var, &d->where) == FAILURE)
12088 /* At this point, we better not have any values left. */
12090 if (next_data_value () == SUCCESS)
12091 gfc_error ("DATA statement at %L has more values than variables",
12096 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12097 accessed by host or use association, is a dummy argument to a pure function,
12098 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12099 is storage associated with any such variable, shall not be used in the
12100 following contexts: (clients of this function). */
12102 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12103 procedure. Returns zero if assignment is OK, nonzero if there is a
12106 gfc_impure_variable (gfc_symbol *sym)
12111 if (sym->attr.use_assoc || sym->attr.in_common)
12114 /* Check if the symbol's ns is inside the pure procedure. */
12115 for (ns = gfc_current_ns; ns; ns = ns->parent)
12119 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12123 proc = sym->ns->proc_name;
12124 if (sym->attr.dummy && gfc_pure (proc)
12125 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12127 proc->attr.function))
12130 /* TODO: Sort out what can be storage associated, if anything, and include
12131 it here. In principle equivalences should be scanned but it does not
12132 seem to be possible to storage associate an impure variable this way. */
12137 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12138 current namespace is inside a pure procedure. */
12141 gfc_pure (gfc_symbol *sym)
12143 symbol_attribute attr;
12148 /* Check if the current namespace or one of its parents
12149 belongs to a pure procedure. */
12150 for (ns = gfc_current_ns; ns; ns = ns->parent)
12152 sym = ns->proc_name;
12156 if (attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental))
12164 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
12168 /* Test whether the current procedure is elemental or not. */
12171 gfc_elemental (gfc_symbol *sym)
12173 symbol_attribute attr;
12176 sym = gfc_current_ns->proc_name;
12181 return attr.flavor == FL_PROCEDURE && attr.elemental;
12185 /* Warn about unused labels. */
12188 warn_unused_fortran_label (gfc_st_label *label)
12193 warn_unused_fortran_label (label->left);
12195 if (label->defined == ST_LABEL_UNKNOWN)
12198 switch (label->referenced)
12200 case ST_LABEL_UNKNOWN:
12201 gfc_warning ("Label %d at %L defined but not used", label->value,
12205 case ST_LABEL_BAD_TARGET:
12206 gfc_warning ("Label %d at %L defined but cannot be used",
12207 label->value, &label->where);
12214 warn_unused_fortran_label (label->right);
12218 /* Returns the sequence type of a symbol or sequence. */
12221 sequence_type (gfc_typespec ts)
12230 if (ts.u.derived->components == NULL)
12231 return SEQ_NONDEFAULT;
12233 result = sequence_type (ts.u.derived->components->ts);
12234 for (c = ts.u.derived->components->next; c; c = c->next)
12235 if (sequence_type (c->ts) != result)
12241 if (ts.kind != gfc_default_character_kind)
12242 return SEQ_NONDEFAULT;
12244 return SEQ_CHARACTER;
12247 if (ts.kind != gfc_default_integer_kind)
12248 return SEQ_NONDEFAULT;
12250 return SEQ_NUMERIC;
12253 if (!(ts.kind == gfc_default_real_kind
12254 || ts.kind == gfc_default_double_kind))
12255 return SEQ_NONDEFAULT;
12257 return SEQ_NUMERIC;
12260 if (ts.kind != gfc_default_complex_kind)
12261 return SEQ_NONDEFAULT;
12263 return SEQ_NUMERIC;
12266 if (ts.kind != gfc_default_logical_kind)
12267 return SEQ_NONDEFAULT;
12269 return SEQ_NUMERIC;
12272 return SEQ_NONDEFAULT;
12277 /* Resolve derived type EQUIVALENCE object. */
12280 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
12282 gfc_component *c = derived->components;
12287 /* Shall not be an object of nonsequence derived type. */
12288 if (!derived->attr.sequence)
12290 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
12291 "attribute to be an EQUIVALENCE object", sym->name,
12296 /* Shall not have allocatable components. */
12297 if (derived->attr.alloc_comp)
12299 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
12300 "components to be an EQUIVALENCE object",sym->name,
12305 if (sym->attr.in_common && has_default_initializer (sym->ts.u.derived))
12307 gfc_error ("Derived type variable '%s' at %L with default "
12308 "initialization cannot be in EQUIVALENCE with a variable "
12309 "in COMMON", sym->name, &e->where);
12313 for (; c ; c = c->next)
12315 if (c->ts.type == BT_DERIVED
12316 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
12319 /* Shall not be an object of sequence derived type containing a pointer
12320 in the structure. */
12321 if (c->attr.pointer)
12323 gfc_error ("Derived type variable '%s' at %L with pointer "
12324 "component(s) cannot be an EQUIVALENCE object",
12325 sym->name, &e->where);
12333 /* Resolve equivalence object.
12334 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
12335 an allocatable array, an object of nonsequence derived type, an object of
12336 sequence derived type containing a pointer at any level of component
12337 selection, an automatic object, a function name, an entry name, a result
12338 name, a named constant, a structure component, or a subobject of any of
12339 the preceding objects. A substring shall not have length zero. A
12340 derived type shall not have components with default initialization nor
12341 shall two objects of an equivalence group be initialized.
12342 Either all or none of the objects shall have an protected attribute.
12343 The simple constraints are done in symbol.c(check_conflict) and the rest
12344 are implemented here. */
12347 resolve_equivalence (gfc_equiv *eq)
12350 gfc_symbol *first_sym;
12353 locus *last_where = NULL;
12354 seq_type eq_type, last_eq_type;
12355 gfc_typespec *last_ts;
12356 int object, cnt_protected;
12359 last_ts = &eq->expr->symtree->n.sym->ts;
12361 first_sym = eq->expr->symtree->n.sym;
12365 for (object = 1; eq; eq = eq->eq, object++)
12369 e->ts = e->symtree->n.sym->ts;
12370 /* match_varspec might not know yet if it is seeing
12371 array reference or substring reference, as it doesn't
12373 if (e->ref && e->ref->type == REF_ARRAY)
12375 gfc_ref *ref = e->ref;
12376 sym = e->symtree->n.sym;
12378 if (sym->attr.dimension)
12380 ref->u.ar.as = sym->as;
12384 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
12385 if (e->ts.type == BT_CHARACTER
12387 && ref->type == REF_ARRAY
12388 && ref->u.ar.dimen == 1
12389 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
12390 && ref->u.ar.stride[0] == NULL)
12392 gfc_expr *start = ref->u.ar.start[0];
12393 gfc_expr *end = ref->u.ar.end[0];
12396 /* Optimize away the (:) reference. */
12397 if (start == NULL && end == NULL)
12400 e->ref = ref->next;
12402 e->ref->next = ref->next;
12407 ref->type = REF_SUBSTRING;
12409 start = gfc_get_int_expr (gfc_default_integer_kind,
12411 ref->u.ss.start = start;
12412 if (end == NULL && e->ts.u.cl)
12413 end = gfc_copy_expr (e->ts.u.cl->length);
12414 ref->u.ss.end = end;
12415 ref->u.ss.length = e->ts.u.cl;
12422 /* Any further ref is an error. */
12425 gcc_assert (ref->type == REF_ARRAY);
12426 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
12432 if (gfc_resolve_expr (e) == FAILURE)
12435 sym = e->symtree->n.sym;
12437 if (sym->attr.is_protected)
12439 if (cnt_protected > 0 && cnt_protected != object)
12441 gfc_error ("Either all or none of the objects in the "
12442 "EQUIVALENCE set at %L shall have the "
12443 "PROTECTED attribute",
12448 /* Shall not equivalence common block variables in a PURE procedure. */
12449 if (sym->ns->proc_name
12450 && sym->ns->proc_name->attr.pure
12451 && sym->attr.in_common)
12453 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
12454 "object in the pure procedure '%s'",
12455 sym->name, &e->where, sym->ns->proc_name->name);
12459 /* Shall not be a named constant. */
12460 if (e->expr_type == EXPR_CONSTANT)
12462 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
12463 "object", sym->name, &e->where);
12467 if (e->ts.type == BT_DERIVED
12468 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
12471 /* Check that the types correspond correctly:
12473 A numeric sequence structure may be equivalenced to another sequence
12474 structure, an object of default integer type, default real type, double
12475 precision real type, default logical type such that components of the
12476 structure ultimately only become associated to objects of the same
12477 kind. A character sequence structure may be equivalenced to an object
12478 of default character kind or another character sequence structure.
12479 Other objects may be equivalenced only to objects of the same type and
12480 kind parameters. */
12482 /* Identical types are unconditionally OK. */
12483 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
12484 goto identical_types;
12486 last_eq_type = sequence_type (*last_ts);
12487 eq_type = sequence_type (sym->ts);
12489 /* Since the pair of objects is not of the same type, mixed or
12490 non-default sequences can be rejected. */
12492 msg = "Sequence %s with mixed components in EQUIVALENCE "
12493 "statement at %L with different type objects";
12495 && last_eq_type == SEQ_MIXED
12496 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
12498 || (eq_type == SEQ_MIXED
12499 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12500 &e->where) == FAILURE))
12503 msg = "Non-default type object or sequence %s in EQUIVALENCE "
12504 "statement at %L with objects of different type";
12506 && last_eq_type == SEQ_NONDEFAULT
12507 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
12508 last_where) == FAILURE)
12509 || (eq_type == SEQ_NONDEFAULT
12510 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12511 &e->where) == FAILURE))
12514 msg ="Non-CHARACTER object '%s' in default CHARACTER "
12515 "EQUIVALENCE statement at %L";
12516 if (last_eq_type == SEQ_CHARACTER
12517 && eq_type != SEQ_CHARACTER
12518 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12519 &e->where) == FAILURE)
12522 msg ="Non-NUMERIC object '%s' in default NUMERIC "
12523 "EQUIVALENCE statement at %L";
12524 if (last_eq_type == SEQ_NUMERIC
12525 && eq_type != SEQ_NUMERIC
12526 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12527 &e->where) == FAILURE)
12532 last_where = &e->where;
12537 /* Shall not be an automatic array. */
12538 if (e->ref->type == REF_ARRAY
12539 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
12541 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
12542 "an EQUIVALENCE object", sym->name, &e->where);
12549 /* Shall not be a structure component. */
12550 if (r->type == REF_COMPONENT)
12552 gfc_error ("Structure component '%s' at %L cannot be an "
12553 "EQUIVALENCE object",
12554 r->u.c.component->name, &e->where);
12558 /* A substring shall not have length zero. */
12559 if (r->type == REF_SUBSTRING)
12561 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
12563 gfc_error ("Substring at %L has length zero",
12564 &r->u.ss.start->where);
12574 /* Resolve function and ENTRY types, issue diagnostics if needed. */
12577 resolve_fntype (gfc_namespace *ns)
12579 gfc_entry_list *el;
12582 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
12585 /* If there are any entries, ns->proc_name is the entry master
12586 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
12588 sym = ns->entries->sym;
12590 sym = ns->proc_name;
12591 if (sym->result == sym
12592 && sym->ts.type == BT_UNKNOWN
12593 && gfc_set_default_type (sym, 0, NULL) == FAILURE
12594 && !sym->attr.untyped)
12596 gfc_error ("Function '%s' at %L has no IMPLICIT type",
12597 sym->name, &sym->declared_at);
12598 sym->attr.untyped = 1;
12601 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
12602 && !sym->attr.contained
12603 && !gfc_check_access (sym->ts.u.derived->attr.access,
12604 sym->ts.u.derived->ns->default_access)
12605 && gfc_check_access (sym->attr.access, sym->ns->default_access))
12607 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
12608 "%L of PRIVATE type '%s'", sym->name,
12609 &sym->declared_at, sym->ts.u.derived->name);
12613 for (el = ns->entries->next; el; el = el->next)
12615 if (el->sym->result == el->sym
12616 && el->sym->ts.type == BT_UNKNOWN
12617 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
12618 && !el->sym->attr.untyped)
12620 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
12621 el->sym->name, &el->sym->declared_at);
12622 el->sym->attr.untyped = 1;
12628 /* 12.3.2.1.1 Defined operators. */
12631 check_uop_procedure (gfc_symbol *sym, locus where)
12633 gfc_formal_arglist *formal;
12635 if (!sym->attr.function)
12637 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
12638 sym->name, &where);
12642 if (sym->ts.type == BT_CHARACTER
12643 && !(sym->ts.u.cl && sym->ts.u.cl->length)
12644 && !(sym->result && sym->result->ts.u.cl
12645 && sym->result->ts.u.cl->length))
12647 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
12648 "character length", sym->name, &where);
12652 formal = sym->formal;
12653 if (!formal || !formal->sym)
12655 gfc_error ("User operator procedure '%s' at %L must have at least "
12656 "one argument", sym->name, &where);
12660 if (formal->sym->attr.intent != INTENT_IN)
12662 gfc_error ("First argument of operator interface at %L must be "
12663 "INTENT(IN)", &where);
12667 if (formal->sym->attr.optional)
12669 gfc_error ("First argument of operator interface at %L cannot be "
12670 "optional", &where);
12674 formal = formal->next;
12675 if (!formal || !formal->sym)
12678 if (formal->sym->attr.intent != INTENT_IN)
12680 gfc_error ("Second argument of operator interface at %L must be "
12681 "INTENT(IN)", &where);
12685 if (formal->sym->attr.optional)
12687 gfc_error ("Second argument of operator interface at %L cannot be "
12688 "optional", &where);
12694 gfc_error ("Operator interface at %L must have, at most, two "
12695 "arguments", &where);
12703 gfc_resolve_uops (gfc_symtree *symtree)
12705 gfc_interface *itr;
12707 if (symtree == NULL)
12710 gfc_resolve_uops (symtree->left);
12711 gfc_resolve_uops (symtree->right);
12713 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12714 check_uop_procedure (itr->sym, itr->sym->declared_at);
12718 /* Examine all of the expressions associated with a program unit,
12719 assign types to all intermediate expressions, make sure that all
12720 assignments are to compatible types and figure out which names
12721 refer to which functions or subroutines. It doesn't check code
12722 block, which is handled by resolve_code. */
12725 resolve_types (gfc_namespace *ns)
12731 gfc_namespace* old_ns = gfc_current_ns;
12733 /* Check that all IMPLICIT types are ok. */
12734 if (!ns->seen_implicit_none)
12737 for (letter = 0; letter != GFC_LETTERS; ++letter)
12738 if (ns->set_flag[letter]
12739 && resolve_typespec_used (&ns->default_type[letter],
12740 &ns->implicit_loc[letter],
12745 gfc_current_ns = ns;
12747 resolve_entries (ns);
12749 resolve_common_vars (ns->blank_common.head, false);
12750 resolve_common_blocks (ns->common_root);
12752 resolve_contained_functions (ns);
12754 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12756 for (cl = ns->cl_list; cl; cl = cl->next)
12757 resolve_charlen (cl);
12759 gfc_traverse_ns (ns, resolve_symbol);
12761 resolve_fntype (ns);
12763 for (n = ns->contained; n; n = n->sibling)
12765 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12766 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12767 "also be PURE", n->proc_name->name,
12768 &n->proc_name->declared_at);
12774 gfc_check_interfaces (ns);
12776 gfc_traverse_ns (ns, resolve_values);
12782 for (d = ns->data; d; d = d->next)
12786 gfc_traverse_ns (ns, gfc_formalize_init_value);
12788 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12790 if (ns->common_root != NULL)
12791 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12793 for (eq = ns->equiv; eq; eq = eq->next)
12794 resolve_equivalence (eq);
12796 /* Warn about unused labels. */
12797 if (warn_unused_label)
12798 warn_unused_fortran_label (ns->st_labels);
12800 gfc_resolve_uops (ns->uop_root);
12802 gfc_current_ns = old_ns;
12806 /* Call resolve_code recursively. */
12809 resolve_codes (gfc_namespace *ns)
12812 bitmap_obstack old_obstack;
12814 for (n = ns->contained; n; n = n->sibling)
12817 gfc_current_ns = ns;
12819 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
12820 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
12823 /* Set to an out of range value. */
12824 current_entry_id = -1;
12826 old_obstack = labels_obstack;
12827 bitmap_obstack_initialize (&labels_obstack);
12829 resolve_code (ns->code, ns);
12831 bitmap_obstack_release (&labels_obstack);
12832 labels_obstack = old_obstack;
12836 /* This function is called after a complete program unit has been compiled.
12837 Its purpose is to examine all of the expressions associated with a program
12838 unit, assign types to all intermediate expressions, make sure that all
12839 assignments are to compatible types and figure out which names refer to
12840 which functions or subroutines. */
12843 gfc_resolve (gfc_namespace *ns)
12845 gfc_namespace *old_ns;
12846 code_stack *old_cs_base;
12852 old_ns = gfc_current_ns;
12853 old_cs_base = cs_base;
12855 resolve_types (ns);
12856 resolve_codes (ns);
12858 gfc_current_ns = old_ns;
12859 cs_base = old_cs_base;