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 (strcmp (comp->name, "$extends") == 0)
903 /* Can afford to be brutal with the $extends initializer.
904 The derived type can get lost because it is PRIVATE
905 but it is not usage constrained by the standard. */
906 cons->expr->ts = comp->ts;
909 else if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
910 gfc_error ("The element in the derived type constructor at %L, "
911 "for pointer component '%s', is %s but should be %s",
912 &cons->expr->where, comp->name,
913 gfc_basic_typename (cons->expr->ts.type),
914 gfc_basic_typename (comp->ts.type));
916 t = gfc_convert_type (cons->expr, &comp->ts, 1);
919 if (cons->expr->expr_type == EXPR_NULL
920 && !(comp->attr.pointer || comp->attr.allocatable
921 || comp->attr.proc_pointer
922 || (comp->ts.type == BT_CLASS
923 && (comp->ts.u.derived->components->attr.pointer
924 || comp->ts.u.derived->components->attr.allocatable))))
927 gfc_error ("The NULL in the derived type constructor at %L is "
928 "being applied to component '%s', which is neither "
929 "a POINTER nor ALLOCATABLE", &cons->expr->where,
933 if (!comp->attr.pointer || cons->expr->expr_type == EXPR_NULL)
936 a = gfc_expr_attr (cons->expr);
938 if (!a.pointer && !a.target)
941 gfc_error ("The element in the derived type constructor at %L, "
942 "for pointer component '%s' should be a POINTER or "
943 "a TARGET", &cons->expr->where, comp->name);
946 /* F2003, C1272 (3). */
947 if (gfc_pure (NULL) && cons->expr->expr_type == EXPR_VARIABLE
948 && (gfc_impure_variable (cons->expr->symtree->n.sym)
949 || gfc_is_coindexed (cons->expr)))
952 gfc_error ("Invalid expression in the derived type constructor for "
953 "pointer component '%s' at %L in PURE procedure",
954 comp->name, &cons->expr->where);
962 /****************** Expression name resolution ******************/
964 /* Returns 0 if a symbol was not declared with a type or
965 attribute declaration statement, nonzero otherwise. */
968 was_declared (gfc_symbol *sym)
974 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
977 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
978 || a.optional || a.pointer || a.save || a.target || a.volatile_
979 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
980 || a.asynchronous || a.codimension)
987 /* Determine if a symbol is generic or not. */
990 generic_sym (gfc_symbol *sym)
994 if (sym->attr.generic ||
995 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
998 if (was_declared (sym) || sym->ns->parent == NULL)
1001 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1008 return generic_sym (s);
1015 /* Determine if a symbol is specific or not. */
1018 specific_sym (gfc_symbol *sym)
1022 if (sym->attr.if_source == IFSRC_IFBODY
1023 || sym->attr.proc == PROC_MODULE
1024 || sym->attr.proc == PROC_INTERNAL
1025 || sym->attr.proc == PROC_ST_FUNCTION
1026 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
1027 || sym->attr.external)
1030 if (was_declared (sym) || sym->ns->parent == NULL)
1033 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1035 return (s == NULL) ? 0 : specific_sym (s);
1039 /* Figure out if the procedure is specific, generic or unknown. */
1042 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1046 procedure_kind (gfc_symbol *sym)
1048 if (generic_sym (sym))
1049 return PTYPE_GENERIC;
1051 if (specific_sym (sym))
1052 return PTYPE_SPECIFIC;
1054 return PTYPE_UNKNOWN;
1057 /* Check references to assumed size arrays. The flag need_full_assumed_size
1058 is nonzero when matching actual arguments. */
1060 static int need_full_assumed_size = 0;
1063 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1065 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1068 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1069 What should it be? */
1070 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1071 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1072 && (e->ref->u.ar.type == AR_FULL))
1074 gfc_error ("The upper bound in the last dimension must "
1075 "appear in the reference to the assumed size "
1076 "array '%s' at %L", sym->name, &e->where);
1083 /* Look for bad assumed size array references in argument expressions
1084 of elemental and array valued intrinsic procedures. Since this is
1085 called from procedure resolution functions, it only recurses at
1089 resolve_assumed_size_actual (gfc_expr *e)
1094 switch (e->expr_type)
1097 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1102 if (resolve_assumed_size_actual (e->value.op.op1)
1103 || resolve_assumed_size_actual (e->value.op.op2))
1114 /* Check a generic procedure, passed as an actual argument, to see if
1115 there is a matching specific name. If none, it is an error, and if
1116 more than one, the reference is ambiguous. */
1118 count_specific_procs (gfc_expr *e)
1125 sym = e->symtree->n.sym;
1127 for (p = sym->generic; p; p = p->next)
1128 if (strcmp (sym->name, p->sym->name) == 0)
1130 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1136 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1140 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1141 "argument at %L", sym->name, &e->where);
1147 /* See if a call to sym could possibly be a not allowed RECURSION because of
1148 a missing RECURIVE declaration. This means that either sym is the current
1149 context itself, or sym is the parent of a contained procedure calling its
1150 non-RECURSIVE containing procedure.
1151 This also works if sym is an ENTRY. */
1154 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1156 gfc_symbol* proc_sym;
1157 gfc_symbol* context_proc;
1158 gfc_namespace* real_context;
1160 if (sym->attr.flavor == FL_PROGRAM)
1163 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1165 /* If we've got an ENTRY, find real procedure. */
1166 if (sym->attr.entry && sym->ns->entries)
1167 proc_sym = sym->ns->entries->sym;
1171 /* If sym is RECURSIVE, all is well of course. */
1172 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1175 /* Find the context procedure's "real" symbol if it has entries.
1176 We look for a procedure symbol, so recurse on the parents if we don't
1177 find one (like in case of a BLOCK construct). */
1178 for (real_context = context; ; real_context = real_context->parent)
1180 /* We should find something, eventually! */
1181 gcc_assert (real_context);
1183 context_proc = (real_context->entries ? real_context->entries->sym
1184 : real_context->proc_name);
1186 /* In some special cases, there may not be a proc_name, like for this
1188 real(bad_kind()) function foo () ...
1189 when checking the call to bad_kind ().
1190 In these cases, we simply return here and assume that the
1195 if (context_proc->attr.flavor != FL_LABEL)
1199 /* A call from sym's body to itself is recursion, of course. */
1200 if (context_proc == proc_sym)
1203 /* The same is true if context is a contained procedure and sym the
1205 if (context_proc->attr.contained)
1207 gfc_symbol* parent_proc;
1209 gcc_assert (context->parent);
1210 parent_proc = (context->parent->entries ? context->parent->entries->sym
1211 : context->parent->proc_name);
1213 if (parent_proc == proc_sym)
1221 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1222 its typespec and formal argument list. */
1225 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1227 gfc_intrinsic_sym* isym;
1233 /* We already know this one is an intrinsic, so we don't call
1234 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1235 gfc_find_subroutine directly to check whether it is a function or
1238 if ((isym = gfc_find_function (sym->name)))
1240 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1241 && !sym->attr.implicit_type)
1242 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1243 " ignored", sym->name, &sym->declared_at);
1245 if (!sym->attr.function &&
1246 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1251 else if ((isym = gfc_find_subroutine (sym->name)))
1253 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1255 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1256 " specifier", sym->name, &sym->declared_at);
1260 if (!sym->attr.subroutine &&
1261 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1266 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1271 gfc_copy_formal_args_intr (sym, isym);
1273 /* Check it is actually available in the standard settings. */
1274 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1277 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1278 " available in the current standard settings but %s. Use"
1279 " an appropriate -std=* option or enable -fall-intrinsics"
1280 " in order to use it.",
1281 sym->name, &sym->declared_at, symstd);
1289 /* Resolve a procedure expression, like passing it to a called procedure or as
1290 RHS for a procedure pointer assignment. */
1293 resolve_procedure_expression (gfc_expr* expr)
1297 if (expr->expr_type != EXPR_VARIABLE)
1299 gcc_assert (expr->symtree);
1301 sym = expr->symtree->n.sym;
1303 if (sym->attr.intrinsic)
1304 resolve_intrinsic (sym, &expr->where);
1306 if (sym->attr.flavor != FL_PROCEDURE
1307 || (sym->attr.function && sym->result == sym))
1310 /* A non-RECURSIVE procedure that is used as procedure expression within its
1311 own body is in danger of being called recursively. */
1312 if (is_illegal_recursion (sym, gfc_current_ns))
1313 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1314 " itself recursively. Declare it RECURSIVE or use"
1315 " -frecursive", sym->name, &expr->where);
1321 /* Resolve an actual argument list. Most of the time, this is just
1322 resolving the expressions in the list.
1323 The exception is that we sometimes have to decide whether arguments
1324 that look like procedure arguments are really simple variable
1328 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1329 bool no_formal_args)
1332 gfc_symtree *parent_st;
1334 int save_need_full_assumed_size;
1335 gfc_component *comp;
1337 for (; arg; arg = arg->next)
1342 /* Check the label is a valid branching target. */
1345 if (arg->label->defined == ST_LABEL_UNKNOWN)
1347 gfc_error ("Label %d referenced at %L is never defined",
1348 arg->label->value, &arg->label->where);
1355 if (gfc_is_proc_ptr_comp (e, &comp))
1358 if (e->expr_type == EXPR_PPC)
1360 if (comp->as != NULL)
1361 e->rank = comp->as->rank;
1362 e->expr_type = EXPR_FUNCTION;
1364 if (gfc_resolve_expr (e) == FAILURE)
1369 if (e->expr_type == EXPR_VARIABLE
1370 && e->symtree->n.sym->attr.generic
1372 && count_specific_procs (e) != 1)
1375 if (e->ts.type != BT_PROCEDURE)
1377 save_need_full_assumed_size = need_full_assumed_size;
1378 if (e->expr_type != EXPR_VARIABLE)
1379 need_full_assumed_size = 0;
1380 if (gfc_resolve_expr (e) != SUCCESS)
1382 need_full_assumed_size = save_need_full_assumed_size;
1386 /* See if the expression node should really be a variable reference. */
1388 sym = e->symtree->n.sym;
1390 if (sym->attr.flavor == FL_PROCEDURE
1391 || sym->attr.intrinsic
1392 || sym->attr.external)
1396 /* If a procedure is not already determined to be something else
1397 check if it is intrinsic. */
1398 if (!sym->attr.intrinsic
1399 && !(sym->attr.external || sym->attr.use_assoc
1400 || sym->attr.if_source == IFSRC_IFBODY)
1401 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1402 sym->attr.intrinsic = 1;
1404 if (sym->attr.proc == PROC_ST_FUNCTION)
1406 gfc_error ("Statement function '%s' at %L is not allowed as an "
1407 "actual argument", sym->name, &e->where);
1410 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1411 sym->attr.subroutine);
1412 if (sym->attr.intrinsic && actual_ok == 0)
1414 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1415 "actual argument", sym->name, &e->where);
1418 if (sym->attr.contained && !sym->attr.use_assoc
1419 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1421 gfc_error ("Internal procedure '%s' is not allowed as an "
1422 "actual argument at %L", sym->name, &e->where);
1425 if (sym->attr.elemental && !sym->attr.intrinsic)
1427 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1428 "allowed as an actual argument at %L", sym->name,
1432 /* Check if a generic interface has a specific procedure
1433 with the same name before emitting an error. */
1434 if (sym->attr.generic && count_specific_procs (e) != 1)
1437 /* Just in case a specific was found for the expression. */
1438 sym = e->symtree->n.sym;
1440 /* If the symbol is the function that names the current (or
1441 parent) scope, then we really have a variable reference. */
1443 if (gfc_is_function_return_value (sym, sym->ns))
1446 /* If all else fails, see if we have a specific intrinsic. */
1447 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1449 gfc_intrinsic_sym *isym;
1451 isym = gfc_find_function (sym->name);
1452 if (isym == NULL || !isym->specific)
1454 gfc_error ("Unable to find a specific INTRINSIC procedure "
1455 "for the reference '%s' at %L", sym->name,
1460 sym->attr.intrinsic = 1;
1461 sym->attr.function = 1;
1464 if (gfc_resolve_expr (e) == FAILURE)
1469 /* See if the name is a module procedure in a parent unit. */
1471 if (was_declared (sym) || sym->ns->parent == NULL)
1474 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1476 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1480 if (parent_st == NULL)
1483 sym = parent_st->n.sym;
1484 e->symtree = parent_st; /* Point to the right thing. */
1486 if (sym->attr.flavor == FL_PROCEDURE
1487 || sym->attr.intrinsic
1488 || sym->attr.external)
1490 if (gfc_resolve_expr (e) == FAILURE)
1496 e->expr_type = EXPR_VARIABLE;
1498 if (sym->as != NULL)
1500 e->rank = sym->as->rank;
1501 e->ref = gfc_get_ref ();
1502 e->ref->type = REF_ARRAY;
1503 e->ref->u.ar.type = AR_FULL;
1504 e->ref->u.ar.as = sym->as;
1507 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1508 primary.c (match_actual_arg). If above code determines that it
1509 is a variable instead, it needs to be resolved as it was not
1510 done at the beginning of this function. */
1511 save_need_full_assumed_size = need_full_assumed_size;
1512 if (e->expr_type != EXPR_VARIABLE)
1513 need_full_assumed_size = 0;
1514 if (gfc_resolve_expr (e) != SUCCESS)
1516 need_full_assumed_size = save_need_full_assumed_size;
1519 /* Check argument list functions %VAL, %LOC and %REF. There is
1520 nothing to do for %REF. */
1521 if (arg->name && arg->name[0] == '%')
1523 if (strncmp ("%VAL", arg->name, 4) == 0)
1525 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1527 gfc_error ("By-value argument at %L is not of numeric "
1534 gfc_error ("By-value argument at %L cannot be an array or "
1535 "an array section", &e->where);
1539 /* Intrinsics are still PROC_UNKNOWN here. However,
1540 since same file external procedures are not resolvable
1541 in gfortran, it is a good deal easier to leave them to
1543 if (ptype != PROC_UNKNOWN
1544 && ptype != PROC_DUMMY
1545 && ptype != PROC_EXTERNAL
1546 && ptype != PROC_MODULE)
1548 gfc_error ("By-value argument at %L is not allowed "
1549 "in this context", &e->where);
1554 /* Statement functions have already been excluded above. */
1555 else if (strncmp ("%LOC", arg->name, 4) == 0
1556 && e->ts.type == BT_PROCEDURE)
1558 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1560 gfc_error ("Passing internal procedure at %L by location "
1561 "not allowed", &e->where);
1567 /* Fortran 2008, C1237. */
1568 if (e->expr_type == EXPR_VARIABLE && gfc_is_coindexed (e)
1569 && gfc_has_ultimate_pointer (e))
1571 gfc_error ("Coindexed actual argument at %L with ultimate pointer "
1572 "component", &e->where);
1581 /* Do the checks of the actual argument list that are specific to elemental
1582 procedures. If called with c == NULL, we have a function, otherwise if
1583 expr == NULL, we have a subroutine. */
1586 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1588 gfc_actual_arglist *arg0;
1589 gfc_actual_arglist *arg;
1590 gfc_symbol *esym = NULL;
1591 gfc_intrinsic_sym *isym = NULL;
1593 gfc_intrinsic_arg *iformal = NULL;
1594 gfc_formal_arglist *eformal = NULL;
1595 bool formal_optional = false;
1596 bool set_by_optional = false;
1600 /* Is this an elemental procedure? */
1601 if (expr && expr->value.function.actual != NULL)
1603 if (expr->value.function.esym != NULL
1604 && expr->value.function.esym->attr.elemental)
1606 arg0 = expr->value.function.actual;
1607 esym = expr->value.function.esym;
1609 else if (expr->value.function.isym != NULL
1610 && expr->value.function.isym->elemental)
1612 arg0 = expr->value.function.actual;
1613 isym = expr->value.function.isym;
1618 else if (c && c->ext.actual != NULL)
1620 arg0 = c->ext.actual;
1622 if (c->resolved_sym)
1623 esym = c->resolved_sym;
1625 esym = c->symtree->n.sym;
1628 if (!esym->attr.elemental)
1634 /* The rank of an elemental is the rank of its array argument(s). */
1635 for (arg = arg0; arg; arg = arg->next)
1637 if (arg->expr != NULL && arg->expr->rank > 0)
1639 rank = arg->expr->rank;
1640 if (arg->expr->expr_type == EXPR_VARIABLE
1641 && arg->expr->symtree->n.sym->attr.optional)
1642 set_by_optional = true;
1644 /* Function specific; set the result rank and shape. */
1648 if (!expr->shape && arg->expr->shape)
1650 expr->shape = gfc_get_shape (rank);
1651 for (i = 0; i < rank; i++)
1652 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1659 /* If it is an array, it shall not be supplied as an actual argument
1660 to an elemental procedure unless an array of the same rank is supplied
1661 as an actual argument corresponding to a nonoptional dummy argument of
1662 that elemental procedure(12.4.1.5). */
1663 formal_optional = false;
1665 iformal = isym->formal;
1667 eformal = esym->formal;
1669 for (arg = arg0; arg; arg = arg->next)
1673 if (eformal->sym && eformal->sym->attr.optional)
1674 formal_optional = true;
1675 eformal = eformal->next;
1677 else if (isym && iformal)
1679 if (iformal->optional)
1680 formal_optional = true;
1681 iformal = iformal->next;
1684 formal_optional = true;
1686 if (pedantic && arg->expr != NULL
1687 && arg->expr->expr_type == EXPR_VARIABLE
1688 && arg->expr->symtree->n.sym->attr.optional
1691 && (set_by_optional || arg->expr->rank != rank)
1692 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1694 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1695 "MISSING, it cannot be the actual argument of an "
1696 "ELEMENTAL procedure unless there is a non-optional "
1697 "argument with the same rank (12.4.1.5)",
1698 arg->expr->symtree->n.sym->name, &arg->expr->where);
1703 for (arg = arg0; arg; arg = arg->next)
1705 if (arg->expr == NULL || arg->expr->rank == 0)
1708 /* Being elemental, the last upper bound of an assumed size array
1709 argument must be present. */
1710 if (resolve_assumed_size_actual (arg->expr))
1713 /* Elemental procedure's array actual arguments must conform. */
1716 if (gfc_check_conformance (arg->expr, e,
1717 "elemental procedure") == FAILURE)
1724 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1725 is an array, the intent inout/out variable needs to be also an array. */
1726 if (rank > 0 && esym && expr == NULL)
1727 for (eformal = esym->formal, arg = arg0; arg && eformal;
1728 arg = arg->next, eformal = eformal->next)
1729 if ((eformal->sym->attr.intent == INTENT_OUT
1730 || eformal->sym->attr.intent == INTENT_INOUT)
1731 && arg->expr && arg->expr->rank == 0)
1733 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1734 "ELEMENTAL subroutine '%s' is a scalar, but another "
1735 "actual argument is an array", &arg->expr->where,
1736 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1737 : "INOUT", eformal->sym->name, esym->name);
1744 /* Go through each actual argument in ACTUAL and see if it can be
1745 implemented as an inlined, non-copying intrinsic. FNSYM is the
1746 function being called, or NULL if not known. */
1749 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1751 gfc_actual_arglist *ap;
1754 for (ap = actual; ap; ap = ap->next)
1756 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1757 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1759 ap->expr->inline_noncopying_intrinsic = 1;
1763 /* This function does the checking of references to global procedures
1764 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1765 77 and 95 standards. It checks for a gsymbol for the name, making
1766 one if it does not already exist. If it already exists, then the
1767 reference being resolved must correspond to the type of gsymbol.
1768 Otherwise, the new symbol is equipped with the attributes of the
1769 reference. The corresponding code that is called in creating
1770 global entities is parse.c.
1772 In addition, for all but -std=legacy, the gsymbols are used to
1773 check the interfaces of external procedures from the same file.
1774 The namespace of the gsymbol is resolved and then, once this is
1775 done the interface is checked. */
1779 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1781 if (!gsym_ns->proc_name->attr.recursive)
1784 if (sym->ns == gsym_ns)
1787 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1794 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1796 if (gsym_ns->entries)
1798 gfc_entry_list *entry = gsym_ns->entries;
1800 for (; entry; entry = entry->next)
1802 if (strcmp (sym->name, entry->sym->name) == 0)
1804 if (strcmp (gsym_ns->proc_name->name,
1805 sym->ns->proc_name->name) == 0)
1809 && strcmp (gsym_ns->proc_name->name,
1810 sym->ns->parent->proc_name->name) == 0)
1819 resolve_global_procedure (gfc_symbol *sym, locus *where,
1820 gfc_actual_arglist **actual, int sub)
1824 enum gfc_symbol_type type;
1826 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1828 gsym = gfc_get_gsymbol (sym->name);
1830 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1831 gfc_global_used (gsym, where);
1833 if (gfc_option.flag_whole_file
1834 && sym->attr.if_source == IFSRC_UNKNOWN
1835 && gsym->type != GSYM_UNKNOWN
1837 && gsym->ns->resolved != -1
1838 && gsym->ns->proc_name
1839 && not_in_recursive (sym, gsym->ns)
1840 && not_entry_self_reference (sym, gsym->ns))
1842 /* Make sure that translation for the gsymbol occurs before
1843 the procedure currently being resolved. */
1844 ns = gsym->ns->resolved ? NULL : gfc_global_ns_list;
1845 for (; ns && ns != gsym->ns; ns = ns->sibling)
1847 if (ns->sibling == gsym->ns)
1849 ns->sibling = gsym->ns->sibling;
1850 gsym->ns->sibling = gfc_global_ns_list;
1851 gfc_global_ns_list = gsym->ns;
1856 if (!gsym->ns->resolved)
1858 gfc_dt_list *old_dt_list;
1860 /* Stash away derived types so that the backend_decls do not
1862 old_dt_list = gfc_derived_types;
1863 gfc_derived_types = NULL;
1865 gfc_resolve (gsym->ns);
1867 /* Store the new derived types with the global namespace. */
1868 if (gfc_derived_types)
1869 gsym->ns->derived_types = gfc_derived_types;
1871 /* Restore the derived types of this namespace. */
1872 gfc_derived_types = old_dt_list;
1875 if (gsym->ns->proc_name->attr.function
1876 && gsym->ns->proc_name->as
1877 && gsym->ns->proc_name->as->rank
1878 && (!sym->as || sym->as->rank != gsym->ns->proc_name->as->rank))
1879 gfc_error ("The reference to function '%s' at %L either needs an "
1880 "explicit INTERFACE or the rank is incorrect", sym->name,
1883 /* Non-assumed length character functions. */
1884 if (sym->attr.function && sym->ts.type == BT_CHARACTER
1885 && gsym->ns->proc_name->ts.u.cl->length != NULL)
1887 gfc_charlen *cl = sym->ts.u.cl;
1889 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
1890 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
1892 gfc_error ("Nonconstant character-length function '%s' at %L "
1893 "must have an explicit interface", sym->name,
1898 if (gfc_option.flag_whole_file == 1
1899 || ((gfc_option.warn_std & GFC_STD_LEGACY)
1901 !(gfc_option.warn_std & GFC_STD_GNU)))
1902 gfc_errors_to_warnings (1);
1904 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1906 gfc_errors_to_warnings (0);
1909 if (gsym->type == GSYM_UNKNOWN)
1912 gsym->where = *where;
1919 /************* Function resolution *************/
1921 /* Resolve a function call known to be generic.
1922 Section 14.1.2.4.1. */
1925 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1929 if (sym->attr.generic)
1931 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1934 expr->value.function.name = s->name;
1935 expr->value.function.esym = s;
1937 if (s->ts.type != BT_UNKNOWN)
1939 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1940 expr->ts = s->result->ts;
1943 expr->rank = s->as->rank;
1944 else if (s->result != NULL && s->result->as != NULL)
1945 expr->rank = s->result->as->rank;
1947 gfc_set_sym_referenced (expr->value.function.esym);
1952 /* TODO: Need to search for elemental references in generic
1956 if (sym->attr.intrinsic)
1957 return gfc_intrinsic_func_interface (expr, 0);
1964 resolve_generic_f (gfc_expr *expr)
1969 sym = expr->symtree->n.sym;
1973 m = resolve_generic_f0 (expr, sym);
1976 else if (m == MATCH_ERROR)
1980 if (sym->ns->parent == NULL)
1982 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1986 if (!generic_sym (sym))
1990 /* Last ditch attempt. See if the reference is to an intrinsic
1991 that possesses a matching interface. 14.1.2.4 */
1992 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
1994 gfc_error ("There is no specific function for the generic '%s' at %L",
1995 expr->symtree->n.sym->name, &expr->where);
1999 m = gfc_intrinsic_func_interface (expr, 0);
2003 gfc_error ("Generic function '%s' at %L is not consistent with a "
2004 "specific intrinsic interface", expr->symtree->n.sym->name,
2011 /* Resolve a function call known to be specific. */
2014 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
2018 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2020 if (sym->attr.dummy)
2022 sym->attr.proc = PROC_DUMMY;
2026 sym->attr.proc = PROC_EXTERNAL;
2030 if (sym->attr.proc == PROC_MODULE
2031 || sym->attr.proc == PROC_ST_FUNCTION
2032 || sym->attr.proc == PROC_INTERNAL)
2035 if (sym->attr.intrinsic)
2037 m = gfc_intrinsic_func_interface (expr, 1);
2041 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2042 "with an intrinsic", sym->name, &expr->where);
2050 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2053 expr->ts = sym->result->ts;
2056 expr->value.function.name = sym->name;
2057 expr->value.function.esym = sym;
2058 if (sym->as != NULL)
2059 expr->rank = sym->as->rank;
2066 resolve_specific_f (gfc_expr *expr)
2071 sym = expr->symtree->n.sym;
2075 m = resolve_specific_f0 (sym, expr);
2078 if (m == MATCH_ERROR)
2081 if (sym->ns->parent == NULL)
2084 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2090 gfc_error ("Unable to resolve the specific function '%s' at %L",
2091 expr->symtree->n.sym->name, &expr->where);
2097 /* Resolve a procedure call not known to be generic nor specific. */
2100 resolve_unknown_f (gfc_expr *expr)
2105 sym = expr->symtree->n.sym;
2107 if (sym->attr.dummy)
2109 sym->attr.proc = PROC_DUMMY;
2110 expr->value.function.name = sym->name;
2114 /* See if we have an intrinsic function reference. */
2116 if (gfc_is_intrinsic (sym, 0, expr->where))
2118 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2123 /* The reference is to an external name. */
2125 sym->attr.proc = PROC_EXTERNAL;
2126 expr->value.function.name = sym->name;
2127 expr->value.function.esym = expr->symtree->n.sym;
2129 if (sym->as != NULL)
2130 expr->rank = sym->as->rank;
2132 /* Type of the expression is either the type of the symbol or the
2133 default type of the symbol. */
2136 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2138 if (sym->ts.type != BT_UNKNOWN)
2142 ts = gfc_get_default_type (sym->name, sym->ns);
2144 if (ts->type == BT_UNKNOWN)
2146 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2147 sym->name, &expr->where);
2158 /* Return true, if the symbol is an external procedure. */
2160 is_external_proc (gfc_symbol *sym)
2162 if (!sym->attr.dummy && !sym->attr.contained
2163 && !(sym->attr.intrinsic
2164 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2165 && sym->attr.proc != PROC_ST_FUNCTION
2166 && !sym->attr.use_assoc
2174 /* Figure out if a function reference is pure or not. Also set the name
2175 of the function for a potential error message. Return nonzero if the
2176 function is PURE, zero if not. */
2178 pure_stmt_function (gfc_expr *, gfc_symbol *);
2181 pure_function (gfc_expr *e, const char **name)
2187 if (e->symtree != NULL
2188 && e->symtree->n.sym != NULL
2189 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2190 return pure_stmt_function (e, e->symtree->n.sym);
2192 if (e->value.function.esym)
2194 pure = gfc_pure (e->value.function.esym);
2195 *name = e->value.function.esym->name;
2197 else if (e->value.function.isym)
2199 pure = e->value.function.isym->pure
2200 || e->value.function.isym->elemental;
2201 *name = e->value.function.isym->name;
2205 /* Implicit functions are not pure. */
2207 *name = e->value.function.name;
2215 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2216 int *f ATTRIBUTE_UNUSED)
2220 /* Don't bother recursing into other statement functions
2221 since they will be checked individually for purity. */
2222 if (e->expr_type != EXPR_FUNCTION
2224 || e->symtree->n.sym == sym
2225 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2228 return pure_function (e, &name) ? false : true;
2233 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2235 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2240 is_scalar_expr_ptr (gfc_expr *expr)
2242 gfc_try retval = SUCCESS;
2247 /* See if we have a gfc_ref, which means we have a substring, array
2248 reference, or a component. */
2249 if (expr->ref != NULL)
2252 while (ref->next != NULL)
2258 if (ref->u.ss.length != NULL
2259 && ref->u.ss.length->length != NULL
2261 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2263 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2265 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2266 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2267 if (end - start + 1 != 1)
2274 if (ref->u.ar.type == AR_ELEMENT)
2276 else if (ref->u.ar.type == AR_FULL)
2278 /* The user can give a full array if the array is of size 1. */
2279 if (ref->u.ar.as != NULL
2280 && ref->u.ar.as->rank == 1
2281 && ref->u.ar.as->type == AS_EXPLICIT
2282 && ref->u.ar.as->lower[0] != NULL
2283 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2284 && ref->u.ar.as->upper[0] != NULL
2285 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2287 /* If we have a character string, we need to check if
2288 its length is one. */
2289 if (expr->ts.type == BT_CHARACTER)
2291 if (expr->ts.u.cl == NULL
2292 || expr->ts.u.cl->length == NULL
2293 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2299 /* We have constant lower and upper bounds. If the
2300 difference between is 1, it can be considered a
2302 start = (int) mpz_get_si
2303 (ref->u.ar.as->lower[0]->value.integer);
2304 end = (int) mpz_get_si
2305 (ref->u.ar.as->upper[0]->value.integer);
2306 if (end - start + 1 != 1)
2321 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2323 /* Character string. Make sure it's of length 1. */
2324 if (expr->ts.u.cl == NULL
2325 || expr->ts.u.cl->length == NULL
2326 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2329 else if (expr->rank != 0)
2336 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2337 and, in the case of c_associated, set the binding label based on
2341 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2342 gfc_symbol **new_sym)
2344 char name[GFC_MAX_SYMBOL_LEN + 1];
2345 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2346 int optional_arg = 0, is_pointer = 0;
2347 gfc_try retval = SUCCESS;
2348 gfc_symbol *args_sym;
2349 gfc_typespec *arg_ts;
2351 if (args->expr->expr_type == EXPR_CONSTANT
2352 || args->expr->expr_type == EXPR_OP
2353 || args->expr->expr_type == EXPR_NULL)
2355 gfc_error ("Argument to '%s' at %L is not a variable",
2356 sym->name, &(args->expr->where));
2360 args_sym = args->expr->symtree->n.sym;
2362 /* The typespec for the actual arg should be that stored in the expr
2363 and not necessarily that of the expr symbol (args_sym), because
2364 the actual expression could be a part-ref of the expr symbol. */
2365 arg_ts = &(args->expr->ts);
2367 is_pointer = gfc_is_data_pointer (args->expr);
2369 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2371 /* If the user gave two args then they are providing something for
2372 the optional arg (the second cptr). Therefore, set the name and
2373 binding label to the c_associated for two cptrs. Otherwise,
2374 set c_associated to expect one cptr. */
2378 sprintf (name, "%s_2", sym->name);
2379 sprintf (binding_label, "%s_2", sym->binding_label);
2385 sprintf (name, "%s_1", sym->name);
2386 sprintf (binding_label, "%s_1", sym->binding_label);
2390 /* Get a new symbol for the version of c_associated that
2392 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2394 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2395 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2397 sprintf (name, "%s", sym->name);
2398 sprintf (binding_label, "%s", sym->binding_label);
2400 /* Error check the call. */
2401 if (args->next != NULL)
2403 gfc_error_now ("More actual than formal arguments in '%s' "
2404 "call at %L", name, &(args->expr->where));
2407 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2409 /* Make sure we have either the target or pointer attribute. */
2410 if (!args_sym->attr.target && !is_pointer)
2412 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2413 "a TARGET or an associated pointer",
2415 sym->name, &(args->expr->where));
2419 /* See if we have interoperable type and type param. */
2420 if (verify_c_interop (arg_ts) == SUCCESS
2421 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2423 if (args_sym->attr.target == 1)
2425 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2426 has the target attribute and is interoperable. */
2427 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2428 allocatable variable that has the TARGET attribute and
2429 is not an array of zero size. */
2430 if (args_sym->attr.allocatable == 1)
2432 if (args_sym->attr.dimension != 0
2433 && (args_sym->as && args_sym->as->rank == 0))
2435 gfc_error_now ("Allocatable variable '%s' used as a "
2436 "parameter to '%s' at %L must not be "
2437 "an array of zero size",
2438 args_sym->name, sym->name,
2439 &(args->expr->where));
2445 /* A non-allocatable target variable with C
2446 interoperable type and type parameters must be
2448 if (args_sym && args_sym->attr.dimension)
2450 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2452 gfc_error ("Assumed-shape array '%s' at %L "
2453 "cannot be an argument to the "
2454 "procedure '%s' because "
2455 "it is not C interoperable",
2457 &(args->expr->where), sym->name);
2460 else if (args_sym->as->type == AS_DEFERRED)
2462 gfc_error ("Deferred-shape array '%s' at %L "
2463 "cannot be an argument to the "
2464 "procedure '%s' because "
2465 "it is not C interoperable",
2467 &(args->expr->where), sym->name);
2472 /* Make sure it's not a character string. Arrays of
2473 any type should be ok if the variable is of a C
2474 interoperable type. */
2475 if (arg_ts->type == BT_CHARACTER)
2476 if (arg_ts->u.cl != NULL
2477 && (arg_ts->u.cl->length == NULL
2478 || arg_ts->u.cl->length->expr_type
2481 (arg_ts->u.cl->length->value.integer, 1)
2483 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2485 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2486 "at %L must have a length of 1",
2487 args_sym->name, sym->name,
2488 &(args->expr->where));
2494 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2496 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2498 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2499 "associated scalar POINTER", args_sym->name,
2500 sym->name, &(args->expr->where));
2506 /* The parameter is not required to be C interoperable. If it
2507 is not C interoperable, it must be a nonpolymorphic scalar
2508 with no length type parameters. It still must have either
2509 the pointer or target attribute, and it can be
2510 allocatable (but must be allocated when c_loc is called). */
2511 if (args->expr->rank != 0
2512 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2514 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2515 "scalar", args_sym->name, sym->name,
2516 &(args->expr->where));
2519 else if (arg_ts->type == BT_CHARACTER
2520 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2522 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2523 "%L must have a length of 1",
2524 args_sym->name, sym->name,
2525 &(args->expr->where));
2530 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2532 if (args_sym->attr.flavor != FL_PROCEDURE)
2534 /* TODO: Update this error message to allow for procedure
2535 pointers once they are implemented. */
2536 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2538 args_sym->name, sym->name,
2539 &(args->expr->where));
2542 else if (args_sym->attr.is_bind_c != 1)
2544 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2546 args_sym->name, sym->name,
2547 &(args->expr->where));
2552 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2557 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2558 "iso_c_binding function: '%s'!\n", sym->name);
2565 /* Resolve a function call, which means resolving the arguments, then figuring
2566 out which entity the name refers to. */
2567 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2568 to INTENT(OUT) or INTENT(INOUT). */
2571 resolve_function (gfc_expr *expr)
2573 gfc_actual_arglist *arg;
2578 procedure_type p = PROC_INTRINSIC;
2579 bool no_formal_args;
2583 sym = expr->symtree->n.sym;
2585 /* If this is a procedure pointer component, it has already been resolved. */
2586 if (gfc_is_proc_ptr_comp (expr, NULL))
2589 if (sym && sym->attr.intrinsic
2590 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2593 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2595 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2599 /* If this ia a deferred TBP with an abstract interface (which may
2600 of course be referenced), expr->value.function.esym will be set. */
2601 if (sym && sym->attr.abstract && !expr->value.function.esym)
2603 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2604 sym->name, &expr->where);
2608 /* Switch off assumed size checking and do this again for certain kinds
2609 of procedure, once the procedure itself is resolved. */
2610 need_full_assumed_size++;
2612 if (expr->symtree && expr->symtree->n.sym)
2613 p = expr->symtree->n.sym->attr.proc;
2615 if (expr->value.function.isym && expr->value.function.isym->inquiry)
2616 inquiry_argument = true;
2617 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2619 if (resolve_actual_arglist (expr->value.function.actual,
2620 p, no_formal_args) == FAILURE)
2622 inquiry_argument = false;
2626 inquiry_argument = false;
2628 /* Need to setup the call to the correct c_associated, depending on
2629 the number of cptrs to user gives to compare. */
2630 if (sym && sym->attr.is_iso_c == 1)
2632 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2636 /* Get the symtree for the new symbol (resolved func).
2637 the old one will be freed later, when it's no longer used. */
2638 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2641 /* Resume assumed_size checking. */
2642 need_full_assumed_size--;
2644 /* If the procedure is external, check for usage. */
2645 if (sym && is_external_proc (sym))
2646 resolve_global_procedure (sym, &expr->where,
2647 &expr->value.function.actual, 0);
2649 if (sym && sym->ts.type == BT_CHARACTER
2651 && sym->ts.u.cl->length == NULL
2653 && expr->value.function.esym == NULL
2654 && !sym->attr.contained)
2656 /* Internal procedures are taken care of in resolve_contained_fntype. */
2657 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2658 "be used at %L since it is not a dummy argument",
2659 sym->name, &expr->where);
2663 /* See if function is already resolved. */
2665 if (expr->value.function.name != NULL)
2667 if (expr->ts.type == BT_UNKNOWN)
2673 /* Apply the rules of section 14.1.2. */
2675 switch (procedure_kind (sym))
2678 t = resolve_generic_f (expr);
2681 case PTYPE_SPECIFIC:
2682 t = resolve_specific_f (expr);
2686 t = resolve_unknown_f (expr);
2690 gfc_internal_error ("resolve_function(): bad function type");
2694 /* If the expression is still a function (it might have simplified),
2695 then we check to see if we are calling an elemental function. */
2697 if (expr->expr_type != EXPR_FUNCTION)
2700 temp = need_full_assumed_size;
2701 need_full_assumed_size = 0;
2703 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2706 if (omp_workshare_flag
2707 && expr->value.function.esym
2708 && ! gfc_elemental (expr->value.function.esym))
2710 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2711 "in WORKSHARE construct", expr->value.function.esym->name,
2716 #define GENERIC_ID expr->value.function.isym->id
2717 else if (expr->value.function.actual != NULL
2718 && expr->value.function.isym != NULL
2719 && GENERIC_ID != GFC_ISYM_LBOUND
2720 && GENERIC_ID != GFC_ISYM_LEN
2721 && GENERIC_ID != GFC_ISYM_LOC
2722 && GENERIC_ID != GFC_ISYM_PRESENT)
2724 /* Array intrinsics must also have the last upper bound of an
2725 assumed size array argument. UBOUND and SIZE have to be
2726 excluded from the check if the second argument is anything
2729 for (arg = expr->value.function.actual; arg; arg = arg->next)
2731 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2732 && arg->next != NULL && arg->next->expr)
2734 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2737 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2740 if ((int)mpz_get_si (arg->next->expr->value.integer)
2745 if (arg->expr != NULL
2746 && arg->expr->rank > 0
2747 && resolve_assumed_size_actual (arg->expr))
2753 need_full_assumed_size = temp;
2756 if (!pure_function (expr, &name) && name)
2760 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2761 "FORALL %s", name, &expr->where,
2762 forall_flag == 2 ? "mask" : "block");
2765 else if (gfc_pure (NULL))
2767 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2768 "procedure within a PURE procedure", name, &expr->where);
2773 /* Functions without the RECURSIVE attribution are not allowed to
2774 * call themselves. */
2775 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2778 esym = expr->value.function.esym;
2780 if (is_illegal_recursion (esym, gfc_current_ns))
2782 if (esym->attr.entry && esym->ns->entries)
2783 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2784 " function '%s' is not RECURSIVE",
2785 esym->name, &expr->where, esym->ns->entries->sym->name);
2787 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2788 " is not RECURSIVE", esym->name, &expr->where);
2794 /* Character lengths of use associated functions may contains references to
2795 symbols not referenced from the current program unit otherwise. Make sure
2796 those symbols are marked as referenced. */
2798 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2799 && expr->value.function.esym->attr.use_assoc)
2801 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
2805 && !((expr->value.function.esym
2806 && expr->value.function.esym->attr.elemental)
2808 (expr->value.function.isym
2809 && expr->value.function.isym->elemental)))
2810 find_noncopying_intrinsics (expr->value.function.esym,
2811 expr->value.function.actual);
2813 /* Make sure that the expression has a typespec that works. */
2814 if (expr->ts.type == BT_UNKNOWN)
2816 if (expr->symtree->n.sym->result
2817 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2818 && !expr->symtree->n.sym->result->attr.proc_pointer)
2819 expr->ts = expr->symtree->n.sym->result->ts;
2826 /************* Subroutine resolution *************/
2829 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2835 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2836 sym->name, &c->loc);
2837 else if (gfc_pure (NULL))
2838 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2844 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2848 if (sym->attr.generic)
2850 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2853 c->resolved_sym = s;
2854 pure_subroutine (c, s);
2858 /* TODO: Need to search for elemental references in generic interface. */
2861 if (sym->attr.intrinsic)
2862 return gfc_intrinsic_sub_interface (c, 0);
2869 resolve_generic_s (gfc_code *c)
2874 sym = c->symtree->n.sym;
2878 m = resolve_generic_s0 (c, sym);
2881 else if (m == MATCH_ERROR)
2885 if (sym->ns->parent == NULL)
2887 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2891 if (!generic_sym (sym))
2895 /* Last ditch attempt. See if the reference is to an intrinsic
2896 that possesses a matching interface. 14.1.2.4 */
2897 sym = c->symtree->n.sym;
2899 if (!gfc_is_intrinsic (sym, 1, c->loc))
2901 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2902 sym->name, &c->loc);
2906 m = gfc_intrinsic_sub_interface (c, 0);
2910 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2911 "intrinsic subroutine interface", sym->name, &c->loc);
2917 /* Set the name and binding label of the subroutine symbol in the call
2918 expression represented by 'c' to include the type and kind of the
2919 second parameter. This function is for resolving the appropriate
2920 version of c_f_pointer() and c_f_procpointer(). For example, a
2921 call to c_f_pointer() for a default integer pointer could have a
2922 name of c_f_pointer_i4. If no second arg exists, which is an error
2923 for these two functions, it defaults to the generic symbol's name
2924 and binding label. */
2927 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2928 char *name, char *binding_label)
2930 gfc_expr *arg = NULL;
2934 /* The second arg of c_f_pointer and c_f_procpointer determines
2935 the type and kind for the procedure name. */
2936 arg = c->ext.actual->next->expr;
2940 /* Set up the name to have the given symbol's name,
2941 plus the type and kind. */
2942 /* a derived type is marked with the type letter 'u' */
2943 if (arg->ts.type == BT_DERIVED)
2946 kind = 0; /* set the kind as 0 for now */
2950 type = gfc_type_letter (arg->ts.type);
2951 kind = arg->ts.kind;
2954 if (arg->ts.type == BT_CHARACTER)
2955 /* Kind info for character strings not needed. */
2958 sprintf (name, "%s_%c%d", sym->name, type, kind);
2959 /* Set up the binding label as the given symbol's label plus
2960 the type and kind. */
2961 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2965 /* If the second arg is missing, set the name and label as
2966 was, cause it should at least be found, and the missing
2967 arg error will be caught by compare_parameters(). */
2968 sprintf (name, "%s", sym->name);
2969 sprintf (binding_label, "%s", sym->binding_label);
2976 /* Resolve a generic version of the iso_c_binding procedure given
2977 (sym) to the specific one based on the type and kind of the
2978 argument(s). Currently, this function resolves c_f_pointer() and
2979 c_f_procpointer based on the type and kind of the second argument
2980 (FPTR). Other iso_c_binding procedures aren't specially handled.
2981 Upon successfully exiting, c->resolved_sym will hold the resolved
2982 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2986 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2988 gfc_symbol *new_sym;
2989 /* this is fine, since we know the names won't use the max */
2990 char name[GFC_MAX_SYMBOL_LEN + 1];
2991 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2992 /* default to success; will override if find error */
2993 match m = MATCH_YES;
2995 /* Make sure the actual arguments are in the necessary order (based on the
2996 formal args) before resolving. */
2997 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2999 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
3000 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
3002 set_name_and_label (c, sym, name, binding_label);
3004 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
3006 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3008 /* Make sure we got a third arg if the second arg has non-zero
3009 rank. We must also check that the type and rank are
3010 correct since we short-circuit this check in
3011 gfc_procedure_use() (called above to sort actual args). */
3012 if (c->ext.actual->next->expr->rank != 0)
3014 if(c->ext.actual->next->next == NULL
3015 || c->ext.actual->next->next->expr == NULL)
3018 gfc_error ("Missing SHAPE parameter for call to %s "
3019 "at %L", sym->name, &(c->loc));
3021 else if (c->ext.actual->next->next->expr->ts.type
3023 || c->ext.actual->next->next->expr->rank != 1)
3026 gfc_error ("SHAPE parameter for call to %s at %L must "
3027 "be a rank 1 INTEGER array", sym->name,
3034 if (m != MATCH_ERROR)
3036 /* the 1 means to add the optional arg to formal list */
3037 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3039 /* for error reporting, say it's declared where the original was */
3040 new_sym->declared_at = sym->declared_at;
3045 /* no differences for c_loc or c_funloc */
3049 /* set the resolved symbol */
3050 if (m != MATCH_ERROR)
3051 c->resolved_sym = new_sym;
3053 c->resolved_sym = sym;
3059 /* Resolve a subroutine call known to be specific. */
3062 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3066 if(sym->attr.is_iso_c)
3068 m = gfc_iso_c_sub_interface (c,sym);
3072 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3074 if (sym->attr.dummy)
3076 sym->attr.proc = PROC_DUMMY;
3080 sym->attr.proc = PROC_EXTERNAL;
3084 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3087 if (sym->attr.intrinsic)
3089 m = gfc_intrinsic_sub_interface (c, 1);
3093 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3094 "with an intrinsic", sym->name, &c->loc);
3102 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3104 c->resolved_sym = sym;
3105 pure_subroutine (c, sym);
3112 resolve_specific_s (gfc_code *c)
3117 sym = c->symtree->n.sym;
3121 m = resolve_specific_s0 (c, sym);
3124 if (m == MATCH_ERROR)
3127 if (sym->ns->parent == NULL)
3130 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3136 sym = c->symtree->n.sym;
3137 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3138 sym->name, &c->loc);
3144 /* Resolve a subroutine call not known to be generic nor specific. */
3147 resolve_unknown_s (gfc_code *c)
3151 sym = c->symtree->n.sym;
3153 if (sym->attr.dummy)
3155 sym->attr.proc = PROC_DUMMY;
3159 /* See if we have an intrinsic function reference. */
3161 if (gfc_is_intrinsic (sym, 1, c->loc))
3163 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3168 /* The reference is to an external name. */
3171 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3173 c->resolved_sym = sym;
3175 pure_subroutine (c, sym);
3181 /* Resolve a subroutine call. Although it was tempting to use the same code
3182 for functions, subroutines and functions are stored differently and this
3183 makes things awkward. */
3186 resolve_call (gfc_code *c)
3189 procedure_type ptype = PROC_INTRINSIC;
3190 gfc_symbol *csym, *sym;
3191 bool no_formal_args;
3193 csym = c->symtree ? c->symtree->n.sym : NULL;
3195 if (csym && csym->ts.type != BT_UNKNOWN)
3197 gfc_error ("'%s' at %L has a type, which is not consistent with "
3198 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3202 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3205 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3206 sym = st ? st->n.sym : NULL;
3207 if (sym && csym != sym
3208 && sym->ns == gfc_current_ns
3209 && sym->attr.flavor == FL_PROCEDURE
3210 && sym->attr.contained)
3213 if (csym->attr.generic)
3214 c->symtree->n.sym = sym;
3217 csym = c->symtree->n.sym;
3221 /* If this ia a deferred TBP with an abstract interface
3222 (which may of course be referenced), c->expr1 will be set. */
3223 if (csym && csym->attr.abstract && !c->expr1)
3225 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3226 csym->name, &c->loc);
3230 /* Subroutines without the RECURSIVE attribution are not allowed to
3231 * call themselves. */
3232 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3234 if (csym->attr.entry && csym->ns->entries)
3235 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3236 " subroutine '%s' is not RECURSIVE",
3237 csym->name, &c->loc, csym->ns->entries->sym->name);
3239 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3240 " is not RECURSIVE", csym->name, &c->loc);
3245 /* Switch off assumed size checking and do this again for certain kinds
3246 of procedure, once the procedure itself is resolved. */
3247 need_full_assumed_size++;
3250 ptype = csym->attr.proc;
3252 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3253 if (resolve_actual_arglist (c->ext.actual, ptype,
3254 no_formal_args) == FAILURE)
3257 /* Resume assumed_size checking. */
3258 need_full_assumed_size--;
3260 /* If external, check for usage. */
3261 if (csym && is_external_proc (csym))
3262 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3265 if (c->resolved_sym == NULL)
3267 c->resolved_isym = NULL;
3268 switch (procedure_kind (csym))
3271 t = resolve_generic_s (c);
3274 case PTYPE_SPECIFIC:
3275 t = resolve_specific_s (c);
3279 t = resolve_unknown_s (c);
3283 gfc_internal_error ("resolve_subroutine(): bad function type");
3287 /* Some checks of elemental subroutine actual arguments. */
3288 if (resolve_elemental_actual (NULL, c) == FAILURE)
3291 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3292 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3297 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3298 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3299 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3300 if their shapes do not match. If either op1->shape or op2->shape is
3301 NULL, return SUCCESS. */
3304 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3311 if (op1->shape != NULL && op2->shape != NULL)
3313 for (i = 0; i < op1->rank; i++)
3315 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3317 gfc_error ("Shapes for operands at %L and %L are not conformable",
3318 &op1->where, &op2->where);
3329 /* Resolve an operator expression node. This can involve replacing the
3330 operation with a user defined function call. */
3333 resolve_operator (gfc_expr *e)
3335 gfc_expr *op1, *op2;
3337 bool dual_locus_error;
3340 /* Resolve all subnodes-- give them types. */
3342 switch (e->value.op.op)
3345 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3348 /* Fall through... */
3351 case INTRINSIC_UPLUS:
3352 case INTRINSIC_UMINUS:
3353 case INTRINSIC_PARENTHESES:
3354 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3359 /* Typecheck the new node. */
3361 op1 = e->value.op.op1;
3362 op2 = e->value.op.op2;
3363 dual_locus_error = false;
3365 if ((op1 && op1->expr_type == EXPR_NULL)
3366 || (op2 && op2->expr_type == EXPR_NULL))
3368 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3372 switch (e->value.op.op)
3374 case INTRINSIC_UPLUS:
3375 case INTRINSIC_UMINUS:
3376 if (op1->ts.type == BT_INTEGER
3377 || op1->ts.type == BT_REAL
3378 || op1->ts.type == BT_COMPLEX)
3384 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3385 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3388 case INTRINSIC_PLUS:
3389 case INTRINSIC_MINUS:
3390 case INTRINSIC_TIMES:
3391 case INTRINSIC_DIVIDE:
3392 case INTRINSIC_POWER:
3393 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3395 gfc_type_convert_binary (e, 1);
3400 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3401 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3402 gfc_typename (&op2->ts));
3405 case INTRINSIC_CONCAT:
3406 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3407 && op1->ts.kind == op2->ts.kind)
3409 e->ts.type = BT_CHARACTER;
3410 e->ts.kind = op1->ts.kind;
3415 _("Operands of string concatenation operator at %%L are %s/%s"),
3416 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3422 case INTRINSIC_NEQV:
3423 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3425 e->ts.type = BT_LOGICAL;
3426 e->ts.kind = gfc_kind_max (op1, op2);
3427 if (op1->ts.kind < e->ts.kind)
3428 gfc_convert_type (op1, &e->ts, 2);
3429 else if (op2->ts.kind < e->ts.kind)
3430 gfc_convert_type (op2, &e->ts, 2);
3434 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3435 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3436 gfc_typename (&op2->ts));
3441 if (op1->ts.type == BT_LOGICAL)
3443 e->ts.type = BT_LOGICAL;
3444 e->ts.kind = op1->ts.kind;
3448 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3449 gfc_typename (&op1->ts));
3453 case INTRINSIC_GT_OS:
3455 case INTRINSIC_GE_OS:
3457 case INTRINSIC_LT_OS:
3459 case INTRINSIC_LE_OS:
3460 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3462 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3466 /* Fall through... */
3469 case INTRINSIC_EQ_OS:
3471 case INTRINSIC_NE_OS:
3472 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3473 && op1->ts.kind == op2->ts.kind)
3475 e->ts.type = BT_LOGICAL;
3476 e->ts.kind = gfc_default_logical_kind;
3480 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3482 gfc_type_convert_binary (e, 1);
3484 e->ts.type = BT_LOGICAL;
3485 e->ts.kind = gfc_default_logical_kind;
3489 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3491 _("Logicals at %%L must be compared with %s instead of %s"),
3492 (e->value.op.op == INTRINSIC_EQ
3493 || e->value.op.op == INTRINSIC_EQ_OS)
3494 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3497 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3498 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3499 gfc_typename (&op2->ts));
3503 case INTRINSIC_USER:
3504 if (e->value.op.uop->op == NULL)
3505 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3506 else if (op2 == NULL)
3507 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3508 e->value.op.uop->name, gfc_typename (&op1->ts));
3510 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3511 e->value.op.uop->name, gfc_typename (&op1->ts),
3512 gfc_typename (&op2->ts));
3516 case INTRINSIC_PARENTHESES:
3518 if (e->ts.type == BT_CHARACTER)
3519 e->ts.u.cl = op1->ts.u.cl;
3523 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3526 /* Deal with arrayness of an operand through an operator. */
3530 switch (e->value.op.op)
3532 case INTRINSIC_PLUS:
3533 case INTRINSIC_MINUS:
3534 case INTRINSIC_TIMES:
3535 case INTRINSIC_DIVIDE:
3536 case INTRINSIC_POWER:
3537 case INTRINSIC_CONCAT:
3541 case INTRINSIC_NEQV:
3543 case INTRINSIC_EQ_OS:
3545 case INTRINSIC_NE_OS:
3547 case INTRINSIC_GT_OS:
3549 case INTRINSIC_GE_OS:
3551 case INTRINSIC_LT_OS:
3553 case INTRINSIC_LE_OS:
3555 if (op1->rank == 0 && op2->rank == 0)
3558 if (op1->rank == 0 && op2->rank != 0)
3560 e->rank = op2->rank;
3562 if (e->shape == NULL)
3563 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3566 if (op1->rank != 0 && op2->rank == 0)
3568 e->rank = op1->rank;
3570 if (e->shape == NULL)
3571 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3574 if (op1->rank != 0 && op2->rank != 0)
3576 if (op1->rank == op2->rank)
3578 e->rank = op1->rank;
3579 if (e->shape == NULL)
3581 t = compare_shapes(op1, op2);
3585 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3590 /* Allow higher level expressions to work. */
3593 /* Try user-defined operators, and otherwise throw an error. */
3594 dual_locus_error = true;
3596 _("Inconsistent ranks for operator at %%L and %%L"));
3603 case INTRINSIC_PARENTHESES:
3605 case INTRINSIC_UPLUS:
3606 case INTRINSIC_UMINUS:
3607 /* Simply copy arrayness attribute */
3608 e->rank = op1->rank;
3610 if (e->shape == NULL)
3611 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3619 /* Attempt to simplify the expression. */
3622 t = gfc_simplify_expr (e, 0);
3623 /* Some calls do not succeed in simplification and return FAILURE
3624 even though there is no error; e.g. variable references to
3625 PARAMETER arrays. */
3626 if (!gfc_is_constant_expr (e))
3635 if (gfc_extend_expr (e, &real_error) == SUCCESS)
3642 if (dual_locus_error)
3643 gfc_error (msg, &op1->where, &op2->where);
3645 gfc_error (msg, &e->where);
3651 /************** Array resolution subroutines **************/
3654 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3657 /* Compare two integer expressions. */
3660 compare_bound (gfc_expr *a, gfc_expr *b)
3664 if (a == NULL || a->expr_type != EXPR_CONSTANT
3665 || b == NULL || b->expr_type != EXPR_CONSTANT)
3668 /* If either of the types isn't INTEGER, we must have
3669 raised an error earlier. */
3671 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3674 i = mpz_cmp (a->value.integer, b->value.integer);
3684 /* Compare an integer expression with an integer. */
3687 compare_bound_int (gfc_expr *a, int b)
3691 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3694 if (a->ts.type != BT_INTEGER)
3695 gfc_internal_error ("compare_bound_int(): Bad expression");
3697 i = mpz_cmp_si (a->value.integer, b);
3707 /* Compare an integer expression with a mpz_t. */
3710 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3714 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3717 if (a->ts.type != BT_INTEGER)
3718 gfc_internal_error ("compare_bound_int(): Bad expression");
3720 i = mpz_cmp (a->value.integer, b);
3730 /* Compute the last value of a sequence given by a triplet.
3731 Return 0 if it wasn't able to compute the last value, or if the
3732 sequence if empty, and 1 otherwise. */
3735 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3736 gfc_expr *stride, mpz_t last)
3740 if (start == NULL || start->expr_type != EXPR_CONSTANT
3741 || end == NULL || end->expr_type != EXPR_CONSTANT
3742 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3745 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3746 || (stride != NULL && stride->ts.type != BT_INTEGER))
3749 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3751 if (compare_bound (start, end) == CMP_GT)
3753 mpz_set (last, end->value.integer);
3757 if (compare_bound_int (stride, 0) == CMP_GT)
3759 /* Stride is positive */
3760 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3765 /* Stride is negative */
3766 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3771 mpz_sub (rem, end->value.integer, start->value.integer);
3772 mpz_tdiv_r (rem, rem, stride->value.integer);
3773 mpz_sub (last, end->value.integer, rem);
3780 /* Compare a single dimension of an array reference to the array
3784 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3788 if (ar->dimen_type[i] == DIMEN_STAR)
3790 gcc_assert (ar->stride[i] == NULL);
3791 /* This implies [*] as [*:] and [*:3] are not possible. */
3792 if (ar->start[i] == NULL)
3794 gcc_assert (ar->end[i] == NULL);
3799 /* Given start, end and stride values, calculate the minimum and
3800 maximum referenced indexes. */
3802 switch (ar->dimen_type[i])
3809 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3812 gfc_warning ("Array reference at %L is out of bounds "
3813 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3814 mpz_get_si (ar->start[i]->value.integer),
3815 mpz_get_si (as->lower[i]->value.integer), i+1);
3817 gfc_warning ("Array reference at %L is out of bounds "
3818 "(%ld < %ld) in codimension %d", &ar->c_where[i],
3819 mpz_get_si (ar->start[i]->value.integer),
3820 mpz_get_si (as->lower[i]->value.integer),
3824 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3827 gfc_warning ("Array reference at %L is out of bounds "
3828 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3829 mpz_get_si (ar->start[i]->value.integer),
3830 mpz_get_si (as->upper[i]->value.integer), i+1);
3832 gfc_warning ("Array reference at %L is out of bounds "
3833 "(%ld > %ld) in codimension %d", &ar->c_where[i],
3834 mpz_get_si (ar->start[i]->value.integer),
3835 mpz_get_si (as->upper[i]->value.integer),
3844 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3845 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3847 comparison comp_start_end = compare_bound (AR_START, AR_END);
3849 /* Check for zero stride, which is not allowed. */
3850 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3852 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3856 /* if start == len || (stride > 0 && start < len)
3857 || (stride < 0 && start > len),
3858 then the array section contains at least one element. In this
3859 case, there is an out-of-bounds access if
3860 (start < lower || start > upper). */
3861 if (compare_bound (AR_START, AR_END) == CMP_EQ
3862 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3863 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3864 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3865 && comp_start_end == CMP_GT))
3867 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3869 gfc_warning ("Lower array reference at %L is out of bounds "
3870 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3871 mpz_get_si (AR_START->value.integer),
3872 mpz_get_si (as->lower[i]->value.integer), i+1);
3875 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3877 gfc_warning ("Lower array reference at %L is out of bounds "
3878 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3879 mpz_get_si (AR_START->value.integer),
3880 mpz_get_si (as->upper[i]->value.integer), i+1);
3885 /* If we can compute the highest index of the array section,
3886 then it also has to be between lower and upper. */
3887 mpz_init (last_value);
3888 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3891 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3893 gfc_warning ("Upper array reference at %L is out of bounds "
3894 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3895 mpz_get_si (last_value),
3896 mpz_get_si (as->lower[i]->value.integer), i+1);
3897 mpz_clear (last_value);
3900 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3902 gfc_warning ("Upper array reference at %L is out of bounds "
3903 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3904 mpz_get_si (last_value),
3905 mpz_get_si (as->upper[i]->value.integer), i+1);
3906 mpz_clear (last_value);
3910 mpz_clear (last_value);
3918 gfc_internal_error ("check_dimension(): Bad array reference");
3925 /* Compare an array reference with an array specification. */
3928 compare_spec_to_ref (gfc_array_ref *ar)
3935 /* TODO: Full array sections are only allowed as actual parameters. */
3936 if (as->type == AS_ASSUMED_SIZE
3937 && (/*ar->type == AR_FULL
3938 ||*/ (ar->type == AR_SECTION
3939 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3941 gfc_error ("Rightmost upper bound of assumed size array section "
3942 "not specified at %L", &ar->where);
3946 if (ar->type == AR_FULL)
3949 if (as->rank != ar->dimen)
3951 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3952 &ar->where, ar->dimen, as->rank);
3956 /* ar->codimen == 0 is a local array. */
3957 if (as->corank != ar->codimen && ar->codimen != 0)
3959 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
3960 &ar->where, ar->codimen, as->corank);
3964 for (i = 0; i < as->rank; i++)
3965 if (check_dimension (i, ar, as) == FAILURE)
3968 /* Local access has no coarray spec. */
3969 if (ar->codimen != 0)
3970 for (i = as->rank; i < as->rank + as->corank; i++)
3972 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate)
3974 gfc_error ("Coindex of codimension %d must be a scalar at %L",
3975 i + 1 - as->rank, &ar->where);
3978 if (check_dimension (i, ar, as) == FAILURE)
3986 /* Resolve one part of an array index. */
3989 gfc_resolve_index_1 (gfc_expr *index, int check_scalar,
3990 int force_index_integer_kind)
3997 if (gfc_resolve_expr (index) == FAILURE)
4000 if (check_scalar && index->rank != 0)
4002 gfc_error ("Array index at %L must be scalar", &index->where);
4006 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4008 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4009 &index->where, gfc_basic_typename (index->ts.type));
4013 if (index->ts.type == BT_REAL)
4014 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4015 &index->where) == FAILURE)
4018 if ((index->ts.kind != gfc_index_integer_kind
4019 && force_index_integer_kind)
4020 || index->ts.type != BT_INTEGER)
4023 ts.type = BT_INTEGER;
4024 ts.kind = gfc_index_integer_kind;
4026 gfc_convert_type_warn (index, &ts, 2, 0);
4032 /* Resolve one part of an array index. */
4035 gfc_resolve_index (gfc_expr *index, int check_scalar)
4037 return gfc_resolve_index_1 (index, check_scalar, 1);
4040 /* Resolve a dim argument to an intrinsic function. */
4043 gfc_resolve_dim_arg (gfc_expr *dim)
4048 if (gfc_resolve_expr (dim) == FAILURE)
4053 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4058 if (dim->ts.type != BT_INTEGER)
4060 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4064 if (dim->ts.kind != gfc_index_integer_kind)
4069 ts.type = BT_INTEGER;
4070 ts.kind = gfc_index_integer_kind;
4072 gfc_convert_type_warn (dim, &ts, 2, 0);
4078 /* Given an expression that contains array references, update those array
4079 references to point to the right array specifications. While this is
4080 filled in during matching, this information is difficult to save and load
4081 in a module, so we take care of it here.
4083 The idea here is that the original array reference comes from the
4084 base symbol. We traverse the list of reference structures, setting
4085 the stored reference to references. Component references can
4086 provide an additional array specification. */
4089 find_array_spec (gfc_expr *e)
4093 gfc_symbol *derived;
4096 if (e->symtree->n.sym->ts.type == BT_CLASS)
4097 as = e->symtree->n.sym->ts.u.derived->components->as;
4099 as = e->symtree->n.sym->as;
4102 for (ref = e->ref; ref; ref = ref->next)
4107 gfc_internal_error ("find_array_spec(): Missing spec");
4114 if (derived == NULL)
4115 derived = e->symtree->n.sym->ts.u.derived;
4117 if (derived->attr.is_class)
4118 derived = derived->components->ts.u.derived;
4120 c = derived->components;
4122 for (; c; c = c->next)
4123 if (c == ref->u.c.component)
4125 /* Track the sequence of component references. */
4126 if (c->ts.type == BT_DERIVED)
4127 derived = c->ts.u.derived;
4132 gfc_internal_error ("find_array_spec(): Component not found");
4134 if (c->attr.dimension)
4137 gfc_internal_error ("find_array_spec(): unused as(1)");
4148 gfc_internal_error ("find_array_spec(): unused as(2)");
4152 /* Resolve an array reference. */
4155 resolve_array_ref (gfc_array_ref *ar)
4157 int i, check_scalar;
4160 for (i = 0; i < ar->dimen + ar->codimen; i++)
4162 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4164 /* Do not force gfc_index_integer_kind for the start. We can
4165 do fine with any integer kind. This avoids temporary arrays
4166 created for indexing with a vector. */
4167 if (gfc_resolve_index_1 (ar->start[i], check_scalar, 0) == FAILURE)
4169 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4171 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4176 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4180 ar->dimen_type[i] = DIMEN_ELEMENT;
4184 ar->dimen_type[i] = DIMEN_VECTOR;
4185 if (e->expr_type == EXPR_VARIABLE
4186 && e->symtree->n.sym->ts.type == BT_DERIVED)
4187 ar->start[i] = gfc_get_parentheses (e);
4191 gfc_error ("Array index at %L is an array of rank %d",
4192 &ar->c_where[i], e->rank);
4197 if (ar->type == AR_FULL && ar->as->rank == 0)
4198 ar->type = AR_ELEMENT;
4200 /* If the reference type is unknown, figure out what kind it is. */
4202 if (ar->type == AR_UNKNOWN)
4204 ar->type = AR_ELEMENT;
4205 for (i = 0; i < ar->dimen; i++)
4206 if (ar->dimen_type[i] == DIMEN_RANGE
4207 || ar->dimen_type[i] == DIMEN_VECTOR)
4209 ar->type = AR_SECTION;
4214 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4222 resolve_substring (gfc_ref *ref)
4224 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4226 if (ref->u.ss.start != NULL)
4228 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4231 if (ref->u.ss.start->ts.type != BT_INTEGER)
4233 gfc_error ("Substring start index at %L must be of type INTEGER",
4234 &ref->u.ss.start->where);
4238 if (ref->u.ss.start->rank != 0)
4240 gfc_error ("Substring start index at %L must be scalar",
4241 &ref->u.ss.start->where);
4245 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4246 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4247 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4249 gfc_error ("Substring start index at %L is less than one",
4250 &ref->u.ss.start->where);
4255 if (ref->u.ss.end != NULL)
4257 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4260 if (ref->u.ss.end->ts.type != BT_INTEGER)
4262 gfc_error ("Substring end index at %L must be of type INTEGER",
4263 &ref->u.ss.end->where);
4267 if (ref->u.ss.end->rank != 0)
4269 gfc_error ("Substring end index at %L must be scalar",
4270 &ref->u.ss.end->where);
4274 if (ref->u.ss.length != NULL
4275 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4276 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4277 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4279 gfc_error ("Substring end index at %L exceeds the string length",
4280 &ref->u.ss.start->where);
4284 if (compare_bound_mpz_t (ref->u.ss.end,
4285 gfc_integer_kinds[k].huge) == CMP_GT
4286 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4287 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4289 gfc_error ("Substring end index at %L is too large",
4290 &ref->u.ss.end->where);
4299 /* This function supplies missing substring charlens. */
4302 gfc_resolve_substring_charlen (gfc_expr *e)
4305 gfc_expr *start, *end;
4307 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4308 if (char_ref->type == REF_SUBSTRING)
4314 gcc_assert (char_ref->next == NULL);
4318 if (e->ts.u.cl->length)
4319 gfc_free_expr (e->ts.u.cl->length);
4320 else if (e->expr_type == EXPR_VARIABLE
4321 && e->symtree->n.sym->attr.dummy)
4325 e->ts.type = BT_CHARACTER;
4326 e->ts.kind = gfc_default_character_kind;
4329 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4331 if (char_ref->u.ss.start)
4332 start = gfc_copy_expr (char_ref->u.ss.start);
4334 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4336 if (char_ref->u.ss.end)
4337 end = gfc_copy_expr (char_ref->u.ss.end);
4338 else if (e->expr_type == EXPR_VARIABLE)
4339 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4346 /* Length = (end - start +1). */
4347 e->ts.u.cl->length = gfc_subtract (end, start);
4348 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4349 gfc_get_int_expr (gfc_default_integer_kind,
4352 e->ts.u.cl->length->ts.type = BT_INTEGER;
4353 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4355 /* Make sure that the length is simplified. */
4356 gfc_simplify_expr (e->ts.u.cl->length, 1);
4357 gfc_resolve_expr (e->ts.u.cl->length);
4361 /* Resolve subtype references. */
4364 resolve_ref (gfc_expr *expr)
4366 int current_part_dimension, n_components, seen_part_dimension;
4369 for (ref = expr->ref; ref; ref = ref->next)
4370 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4372 find_array_spec (expr);
4376 for (ref = expr->ref; ref; ref = ref->next)
4380 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4388 resolve_substring (ref);
4392 /* Check constraints on part references. */
4394 current_part_dimension = 0;
4395 seen_part_dimension = 0;
4398 for (ref = expr->ref; ref; ref = ref->next)
4403 switch (ref->u.ar.type)
4406 /* Coarray scalar. */
4407 if (ref->u.ar.as->rank == 0)
4409 current_part_dimension = 0;
4414 current_part_dimension = 1;
4418 current_part_dimension = 0;
4422 gfc_internal_error ("resolve_ref(): Bad array reference");
4428 if (current_part_dimension || seen_part_dimension)
4431 if (ref->u.c.component->attr.pointer
4432 || ref->u.c.component->attr.proc_pointer)
4434 gfc_error ("Component to the right of a part reference "
4435 "with nonzero rank must not have the POINTER "
4436 "attribute at %L", &expr->where);
4439 else if (ref->u.c.component->attr.allocatable)
4441 gfc_error ("Component to the right of a part reference "
4442 "with nonzero rank must not have the ALLOCATABLE "
4443 "attribute at %L", &expr->where);
4455 if (((ref->type == REF_COMPONENT && n_components > 1)
4456 || ref->next == NULL)
4457 && current_part_dimension
4458 && seen_part_dimension)
4460 gfc_error ("Two or more part references with nonzero rank must "
4461 "not be specified at %L", &expr->where);
4465 if (ref->type == REF_COMPONENT)
4467 if (current_part_dimension)
4468 seen_part_dimension = 1;
4470 /* reset to make sure */
4471 current_part_dimension = 0;
4479 /* Given an expression, determine its shape. This is easier than it sounds.
4480 Leaves the shape array NULL if it is not possible to determine the shape. */
4483 expression_shape (gfc_expr *e)
4485 mpz_t array[GFC_MAX_DIMENSIONS];
4488 if (e->rank == 0 || e->shape != NULL)
4491 for (i = 0; i < e->rank; i++)
4492 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4495 e->shape = gfc_get_shape (e->rank);
4497 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4502 for (i--; i >= 0; i--)
4503 mpz_clear (array[i]);
4507 /* Given a variable expression node, compute the rank of the expression by
4508 examining the base symbol and any reference structures it may have. */
4511 expression_rank (gfc_expr *e)
4516 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4517 could lead to serious confusion... */
4518 gcc_assert (e->expr_type != EXPR_COMPCALL);
4522 if (e->expr_type == EXPR_ARRAY)
4524 /* Constructors can have a rank different from one via RESHAPE(). */
4526 if (e->symtree == NULL)
4532 e->rank = (e->symtree->n.sym->as == NULL)
4533 ? 0 : e->symtree->n.sym->as->rank;
4539 for (ref = e->ref; ref; ref = ref->next)
4541 if (ref->type != REF_ARRAY)
4544 if (ref->u.ar.type == AR_FULL)
4546 rank = ref->u.ar.as->rank;
4550 if (ref->u.ar.type == AR_SECTION)
4552 /* Figure out the rank of the section. */
4554 gfc_internal_error ("expression_rank(): Two array specs");
4556 for (i = 0; i < ref->u.ar.dimen; i++)
4557 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4558 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4568 expression_shape (e);
4572 /* Resolve a variable expression. */
4575 resolve_variable (gfc_expr *e)
4582 if (e->symtree == NULL)
4585 if (e->ref && resolve_ref (e) == FAILURE)
4588 sym = e->symtree->n.sym;
4589 if (sym->attr.flavor == FL_PROCEDURE
4590 && (!sym->attr.function
4591 || (sym->attr.function && sym->result
4592 && sym->result->attr.proc_pointer
4593 && !sym->result->attr.function)))
4595 e->ts.type = BT_PROCEDURE;
4596 goto resolve_procedure;
4599 if (sym->ts.type != BT_UNKNOWN)
4600 gfc_variable_attr (e, &e->ts);
4603 /* Must be a simple variable reference. */
4604 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4609 if (check_assumed_size_reference (sym, e))
4612 /* Deal with forward references to entries during resolve_code, to
4613 satisfy, at least partially, 12.5.2.5. */
4614 if (gfc_current_ns->entries
4615 && current_entry_id == sym->entry_id
4618 && cs_base->current->op != EXEC_ENTRY)
4620 gfc_entry_list *entry;
4621 gfc_formal_arglist *formal;
4625 /* If the symbol is a dummy... */
4626 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4628 entry = gfc_current_ns->entries;
4631 /* ...test if the symbol is a parameter of previous entries. */
4632 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4633 for (formal = entry->sym->formal; formal; formal = formal->next)
4635 if (formal->sym && sym->name == formal->sym->name)
4639 /* If it has not been seen as a dummy, this is an error. */
4642 if (specification_expr)
4643 gfc_error ("Variable '%s', used in a specification expression"
4644 ", is referenced at %L before the ENTRY statement "
4645 "in which it is a parameter",
4646 sym->name, &cs_base->current->loc);
4648 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4649 "statement in which it is a parameter",
4650 sym->name, &cs_base->current->loc);
4655 /* Now do the same check on the specification expressions. */
4656 specification_expr = 1;
4657 if (sym->ts.type == BT_CHARACTER
4658 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4662 for (n = 0; n < sym->as->rank; n++)
4664 specification_expr = 1;
4665 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4667 specification_expr = 1;
4668 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4671 specification_expr = 0;
4674 /* Update the symbol's entry level. */
4675 sym->entry_id = current_entry_id + 1;
4679 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4682 /* F2008, C617 and C1229. */
4683 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
4684 && gfc_is_coindexed (e))
4686 gfc_ref *ref, *ref2 = NULL;
4688 if (e->ts.type == BT_CLASS)
4690 gfc_error ("Polymorphic subobject of coindexed object at %L",
4695 for (ref = e->ref; ref; ref = ref->next)
4697 if (ref->type == REF_COMPONENT)
4699 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
4703 for ( ; ref; ref = ref->next)
4704 if (ref->type == REF_COMPONENT)
4707 /* Expression itself is coindexed object. */
4711 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
4712 for ( ; c; c = c->next)
4713 if (c->attr.allocatable && c->ts.type == BT_CLASS)
4715 gfc_error ("Coindexed object with polymorphic allocatable "
4716 "subcomponent at %L", &e->where);
4727 /* Checks to see that the correct symbol has been host associated.
4728 The only situation where this arises is that in which a twice
4729 contained function is parsed after the host association is made.
4730 Therefore, on detecting this, change the symbol in the expression
4731 and convert the array reference into an actual arglist if the old
4732 symbol is a variable. */
4734 check_host_association (gfc_expr *e)
4736 gfc_symbol *sym, *old_sym;
4740 gfc_actual_arglist *arg, *tail = NULL;
4741 bool retval = e->expr_type == EXPR_FUNCTION;
4743 /* If the expression is the result of substitution in
4744 interface.c(gfc_extend_expr) because there is no way in
4745 which the host association can be wrong. */
4746 if (e->symtree == NULL
4747 || e->symtree->n.sym == NULL
4748 || e->user_operator)
4751 old_sym = e->symtree->n.sym;
4753 if (gfc_current_ns->parent
4754 && old_sym->ns != gfc_current_ns)
4756 /* Use the 'USE' name so that renamed module symbols are
4757 correctly handled. */
4758 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4760 if (sym && old_sym != sym
4761 && sym->ts.type == old_sym->ts.type
4762 && sym->attr.flavor == FL_PROCEDURE
4763 && sym->attr.contained)
4765 /* Clear the shape, since it might not be valid. */
4766 if (e->shape != NULL)
4768 for (n = 0; n < e->rank; n++)
4769 mpz_clear (e->shape[n]);
4771 gfc_free (e->shape);
4774 /* Give the expression the right symtree! */
4775 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4776 gcc_assert (st != NULL);
4778 if (old_sym->attr.flavor == FL_PROCEDURE
4779 || e->expr_type == EXPR_FUNCTION)
4781 /* Original was function so point to the new symbol, since
4782 the actual argument list is already attached to the
4784 e->value.function.esym = NULL;
4789 /* Original was variable so convert array references into
4790 an actual arglist. This does not need any checking now
4791 since gfc_resolve_function will take care of it. */
4792 e->value.function.actual = NULL;
4793 e->expr_type = EXPR_FUNCTION;
4796 /* Ambiguity will not arise if the array reference is not
4797 the last reference. */
4798 for (ref = e->ref; ref; ref = ref->next)
4799 if (ref->type == REF_ARRAY && ref->next == NULL)
4802 gcc_assert (ref->type == REF_ARRAY);
4804 /* Grab the start expressions from the array ref and
4805 copy them into actual arguments. */
4806 for (n = 0; n < ref->u.ar.dimen; n++)
4808 arg = gfc_get_actual_arglist ();
4809 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4810 if (e->value.function.actual == NULL)
4811 tail = e->value.function.actual = arg;
4819 /* Dump the reference list and set the rank. */
4820 gfc_free_ref_list (e->ref);
4822 e->rank = sym->as ? sym->as->rank : 0;
4825 gfc_resolve_expr (e);
4829 /* This might have changed! */
4830 return e->expr_type == EXPR_FUNCTION;
4835 gfc_resolve_character_operator (gfc_expr *e)
4837 gfc_expr *op1 = e->value.op.op1;
4838 gfc_expr *op2 = e->value.op.op2;
4839 gfc_expr *e1 = NULL;
4840 gfc_expr *e2 = NULL;
4842 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4844 if (op1->ts.u.cl && op1->ts.u.cl->length)
4845 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4846 else if (op1->expr_type == EXPR_CONSTANT)
4847 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4848 op1->value.character.length);
4850 if (op2->ts.u.cl && op2->ts.u.cl->length)
4851 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4852 else if (op2->expr_type == EXPR_CONSTANT)
4853 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4854 op2->value.character.length);
4856 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4861 e->ts.u.cl->length = gfc_add (e1, e2);
4862 e->ts.u.cl->length->ts.type = BT_INTEGER;
4863 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4864 gfc_simplify_expr (e->ts.u.cl->length, 0);
4865 gfc_resolve_expr (e->ts.u.cl->length);
4871 /* Ensure that an character expression has a charlen and, if possible, a
4872 length expression. */
4875 fixup_charlen (gfc_expr *e)
4877 /* The cases fall through so that changes in expression type and the need
4878 for multiple fixes are picked up. In all circumstances, a charlen should
4879 be available for the middle end to hang a backend_decl on. */
4880 switch (e->expr_type)
4883 gfc_resolve_character_operator (e);
4886 if (e->expr_type == EXPR_ARRAY)
4887 gfc_resolve_character_array_constructor (e);
4889 case EXPR_SUBSTRING:
4890 if (!e->ts.u.cl && e->ref)
4891 gfc_resolve_substring_charlen (e);
4895 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4902 /* Update an actual argument to include the passed-object for type-bound
4903 procedures at the right position. */
4905 static gfc_actual_arglist*
4906 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
4909 gcc_assert (argpos > 0);
4913 gfc_actual_arglist* result;
4915 result = gfc_get_actual_arglist ();
4919 result->name = name;
4925 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
4927 lst = update_arglist_pass (NULL, po, argpos - 1, name);
4932 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4935 extract_compcall_passed_object (gfc_expr* e)
4939 gcc_assert (e->expr_type == EXPR_COMPCALL);
4941 if (e->value.compcall.base_object)
4942 po = gfc_copy_expr (e->value.compcall.base_object);
4945 po = gfc_get_expr ();
4946 po->expr_type = EXPR_VARIABLE;
4947 po->symtree = e->symtree;
4948 po->ref = gfc_copy_ref (e->ref);
4949 po->where = e->where;
4952 if (gfc_resolve_expr (po) == FAILURE)
4959 /* Update the arglist of an EXPR_COMPCALL expression to include the
4963 update_compcall_arglist (gfc_expr* e)
4966 gfc_typebound_proc* tbp;
4968 tbp = e->value.compcall.tbp;
4973 po = extract_compcall_passed_object (e);
4977 if (tbp->nopass || e->value.compcall.ignore_pass)
4983 gcc_assert (tbp->pass_arg_num > 0);
4984 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4992 /* Extract the passed object from a PPC call (a copy of it). */
4995 extract_ppc_passed_object (gfc_expr *e)
5000 po = gfc_get_expr ();
5001 po->expr_type = EXPR_VARIABLE;
5002 po->symtree = e->symtree;
5003 po->ref = gfc_copy_ref (e->ref);
5004 po->where = e->where;
5006 /* Remove PPC reference. */
5008 while ((*ref)->next)
5009 ref = &(*ref)->next;
5010 gfc_free_ref_list (*ref);
5013 if (gfc_resolve_expr (po) == FAILURE)
5020 /* Update the actual arglist of a procedure pointer component to include the
5024 update_ppc_arglist (gfc_expr* e)
5028 gfc_typebound_proc* tb;
5030 if (!gfc_is_proc_ptr_comp (e, &ppc))
5037 else if (tb->nopass)
5040 po = extract_ppc_passed_object (e);
5046 gfc_error ("Passed-object at %L must be scalar", &e->where);
5050 gcc_assert (tb->pass_arg_num > 0);
5051 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5059 /* Check that the object a TBP is called on is valid, i.e. it must not be
5060 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5063 check_typebound_baseobject (gfc_expr* e)
5067 base = extract_compcall_passed_object (e);
5071 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5073 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5075 gfc_error ("Base object for type-bound procedure call at %L is of"
5076 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5080 /* If the procedure called is NOPASS, the base object must be scalar. */
5081 if (e->value.compcall.tbp->nopass && base->rank > 0)
5083 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5084 " be scalar", &e->where);
5088 /* FIXME: Remove once PR 41177 (this problem) is fixed completely. */
5091 gfc_error ("Non-scalar base object at %L currently not implemented",
5100 /* Resolve a call to a type-bound procedure, either function or subroutine,
5101 statically from the data in an EXPR_COMPCALL expression. The adapted
5102 arglist and the target-procedure symtree are returned. */
5105 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5106 gfc_actual_arglist** actual)
5108 gcc_assert (e->expr_type == EXPR_COMPCALL);
5109 gcc_assert (!e->value.compcall.tbp->is_generic);
5111 /* Update the actual arglist for PASS. */
5112 if (update_compcall_arglist (e) == FAILURE)
5115 *actual = e->value.compcall.actual;
5116 *target = e->value.compcall.tbp->u.specific;
5118 gfc_free_ref_list (e->ref);
5120 e->value.compcall.actual = NULL;
5126 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5127 which of the specific bindings (if any) matches the arglist and transform
5128 the expression into a call of that binding. */
5131 resolve_typebound_generic_call (gfc_expr* e, const char **name)
5133 gfc_typebound_proc* genproc;
5134 const char* genname;
5136 gcc_assert (e->expr_type == EXPR_COMPCALL);
5137 genname = e->value.compcall.name;
5138 genproc = e->value.compcall.tbp;
5140 if (!genproc->is_generic)
5143 /* Try the bindings on this type and in the inheritance hierarchy. */
5144 for (; genproc; genproc = genproc->overridden)
5148 gcc_assert (genproc->is_generic);
5149 for (g = genproc->u.generic; g; g = g->next)
5152 gfc_actual_arglist* args;
5155 gcc_assert (g->specific);
5157 if (g->specific->error)
5160 target = g->specific->u.specific->n.sym;
5162 /* Get the right arglist by handling PASS/NOPASS. */
5163 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5164 if (!g->specific->nopass)
5167 po = extract_compcall_passed_object (e);
5171 gcc_assert (g->specific->pass_arg_num > 0);
5172 gcc_assert (!g->specific->error);
5173 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5174 g->specific->pass_arg);
5176 resolve_actual_arglist (args, target->attr.proc,
5177 is_external_proc (target) && !target->formal);
5179 /* Check if this arglist matches the formal. */
5180 matches = gfc_arglist_matches_symbol (&args, target);
5182 /* Clean up and break out of the loop if we've found it. */
5183 gfc_free_actual_arglist (args);
5186 e->value.compcall.tbp = g->specific;
5187 /* Pass along the name for CLASS methods, where the vtab
5188 procedure pointer component has to be referenced. */
5190 *name = g->specific_st->name;
5196 /* Nothing matching found! */
5197 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5198 " '%s' at %L", genname, &e->where);
5206 /* Resolve a call to a type-bound subroutine. */
5209 resolve_typebound_call (gfc_code* c, const char **name)
5211 gfc_actual_arglist* newactual;
5212 gfc_symtree* target;
5214 /* Check that's really a SUBROUTINE. */
5215 if (!c->expr1->value.compcall.tbp->subroutine)
5217 gfc_error ("'%s' at %L should be a SUBROUTINE",
5218 c->expr1->value.compcall.name, &c->loc);
5222 if (check_typebound_baseobject (c->expr1) == FAILURE)
5225 /* Pass along the name for CLASS methods, where the vtab
5226 procedure pointer component has to be referenced. */
5228 *name = c->expr1->value.compcall.name;
5230 if (resolve_typebound_generic_call (c->expr1, name) == FAILURE)
5233 /* Transform into an ordinary EXEC_CALL for now. */
5235 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5238 c->ext.actual = newactual;
5239 c->symtree = target;
5240 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5242 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5244 gfc_free_expr (c->expr1);
5245 c->expr1 = gfc_get_expr ();
5246 c->expr1->expr_type = EXPR_FUNCTION;
5247 c->expr1->symtree = target;
5248 c->expr1->where = c->loc;
5250 return resolve_call (c);
5254 /* Resolve a component-call expression. */
5256 resolve_compcall (gfc_expr* e, const char **name)
5258 gfc_actual_arglist* newactual;
5259 gfc_symtree* target;
5261 /* Check that's really a FUNCTION. */
5262 if (!e->value.compcall.tbp->function)
5264 gfc_error ("'%s' at %L should be a FUNCTION",
5265 e->value.compcall.name, &e->where);
5269 /* These must not be assign-calls! */
5270 gcc_assert (!e->value.compcall.assign);
5272 if (check_typebound_baseobject (e) == FAILURE)
5275 /* Pass along the name for CLASS methods, where the vtab
5276 procedure pointer component has to be referenced. */
5278 *name = e->value.compcall.name;
5280 if (resolve_typebound_generic_call (e, name) == FAILURE)
5282 gcc_assert (!e->value.compcall.tbp->is_generic);
5284 /* Take the rank from the function's symbol. */
5285 if (e->value.compcall.tbp->u.specific->n.sym->as)
5286 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5288 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5289 arglist to the TBP's binding target. */
5291 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5294 e->value.function.actual = newactual;
5295 e->value.function.name = NULL;
5296 e->value.function.esym = target->n.sym;
5297 e->value.function.isym = NULL;
5298 e->symtree = target;
5299 e->ts = target->n.sym->ts;
5300 e->expr_type = EXPR_FUNCTION;
5302 /* Resolution is not necessary if this is a class subroutine; this
5303 function only has to identify the specific proc. Resolution of
5304 the call will be done next in resolve_typebound_call. */
5305 return gfc_resolve_expr (e);
5309 /* Get the ultimate declared type from an expression. In addition,
5310 return the last class/derived type reference and the copy of the
5313 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5316 gfc_symbol *declared;
5321 *new_ref = gfc_copy_ref (e->ref);
5322 for (ref = *new_ref; ref; ref = ref->next)
5324 if (ref->type != REF_COMPONENT)
5327 if (ref->u.c.component->ts.type == BT_CLASS
5328 || ref->u.c.component->ts.type == BT_DERIVED)
5330 declared = ref->u.c.component->ts.u.derived;
5335 if (declared == NULL)
5336 declared = e->symtree->n.sym->ts.u.derived;
5342 /* Resolve a typebound function, or 'method'. First separate all
5343 the non-CLASS references by calling resolve_compcall directly. */
5346 resolve_typebound_function (gfc_expr* e)
5348 gfc_symbol *declared;
5354 const char *genname;
5359 return resolve_compcall (e, NULL);
5361 /* Get the CLASS declared type. */
5362 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5364 /* Weed out cases of the ultimate component being a derived type. */
5365 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5366 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5368 gfc_free_ref_list (new_ref);
5369 return resolve_compcall (e, NULL);
5372 c = gfc_find_component (declared, "$data", true, true);
5373 declared = c->ts.u.derived;
5375 /* Keep the generic name so that the vtab reference can be made. */
5377 if (e->value.compcall.tbp->is_generic)
5378 genname = e->value.compcall.name;
5380 /* Treat the call as if it is a typebound procedure, in order to roll
5381 out the correct name for the specific function. */
5382 resolve_compcall (e, &name);
5385 /* Then convert the expression to a procedure pointer component call. */
5386 e->value.function.esym = NULL;
5391 gfc_free_ref_list (class_ref->next);
5395 /* '$vptr' points to the vtab, which contains the procedure pointers. */
5396 gfc_add_component_ref (e, "$vptr");
5399 /* A generic procedure needs the subsidiary vtabs and vtypes for
5400 the specific procedures to have been build. */
5402 vtab = gfc_find_derived_vtab (declared, true);
5404 gfc_add_component_ref (e, genname);
5406 gfc_add_component_ref (e, name);
5408 /* Recover the typespec for the expression. This is really only
5409 necessary for generic procedures, where the additional call
5410 to gfc_add_component_ref seems to throw the collection of the
5411 correct typespec. */
5416 /* Resolve a typebound subroutine, or 'method'. First separate all
5417 the non-CLASS references by calling resolve_typebound_call
5421 resolve_typebound_subroutine (gfc_code *code)
5423 gfc_symbol *declared;
5428 const char *genname;
5432 st = code->expr1->symtree;
5434 return resolve_typebound_call (code, NULL);
5436 /* Get the CLASS declared type. */
5437 declared = get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5439 /* Weed out cases of the ultimate component being a derived type. */
5440 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5441 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5443 gfc_free_ref_list (new_ref);
5444 return resolve_typebound_call (code, NULL);
5447 c = gfc_find_component (declared, "$data", true, true);
5448 declared = c->ts.u.derived;
5450 /* Keep the generic name so that the vtab reference can be made. */
5452 if (code->expr1->value.compcall.tbp->is_generic)
5453 genname = code->expr1->value.compcall.name;
5455 resolve_typebound_call (code, &name);
5456 ts = code->expr1->ts;
5458 /* Then convert the expression to a procedure pointer component call. */
5459 code->expr1->value.function.esym = NULL;
5460 code->expr1->symtree = st;
5464 gfc_free_ref_list (class_ref->next);
5465 code->expr1->ref = new_ref;
5468 /* '$vptr' points to the vtab, which contains the procedure pointers. */
5469 gfc_add_component_ref (code->expr1, "$vptr");
5472 /* A generic procedure needs the subsidiary vtabs and vtypes for
5473 the specific procedures to have been build. */
5475 vtab = gfc_find_derived_vtab (declared, true);
5477 gfc_add_component_ref (code->expr1, genname);
5479 gfc_add_component_ref (code->expr1, name);
5481 /* Recover the typespec for the expression. This is really only
5482 necessary for generic procedures, where the additional call
5483 to gfc_add_component_ref seems to throw the collection of the
5484 correct typespec. */
5485 code->expr1->ts = ts;
5490 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5493 resolve_ppc_call (gfc_code* c)
5495 gfc_component *comp;
5498 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5501 c->resolved_sym = c->expr1->symtree->n.sym;
5502 c->expr1->expr_type = EXPR_VARIABLE;
5504 if (!comp->attr.subroutine)
5505 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5507 if (resolve_ref (c->expr1) == FAILURE)
5510 if (update_ppc_arglist (c->expr1) == FAILURE)
5513 c->ext.actual = c->expr1->value.compcall.actual;
5515 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5516 comp->formal == NULL) == FAILURE)
5519 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5525 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5528 resolve_expr_ppc (gfc_expr* e)
5530 gfc_component *comp;
5533 b = gfc_is_proc_ptr_comp (e, &comp);
5536 /* Convert to EXPR_FUNCTION. */
5537 e->expr_type = EXPR_FUNCTION;
5538 e->value.function.isym = NULL;
5539 e->value.function.actual = e->value.compcall.actual;
5541 if (comp->as != NULL)
5542 e->rank = comp->as->rank;
5544 if (!comp->attr.function)
5545 gfc_add_function (&comp->attr, comp->name, &e->where);
5547 if (resolve_ref (e) == FAILURE)
5550 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5551 comp->formal == NULL) == FAILURE)
5554 if (update_ppc_arglist (e) == FAILURE)
5557 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5564 gfc_is_expandable_expr (gfc_expr *e)
5566 gfc_constructor *con;
5568 if (e->expr_type == EXPR_ARRAY)
5570 /* Traverse the constructor looking for variables that are flavor
5571 parameter. Parameters must be expanded since they are fully used at
5573 con = gfc_constructor_first (e->value.constructor);
5574 for (; con; con = gfc_constructor_next (con))
5576 if (con->expr->expr_type == EXPR_VARIABLE
5577 && con->expr->symtree
5578 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
5579 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
5581 if (con->expr->expr_type == EXPR_ARRAY
5582 && gfc_is_expandable_expr (con->expr))
5590 /* Resolve an expression. That is, make sure that types of operands agree
5591 with their operators, intrinsic operators are converted to function calls
5592 for overloaded types and unresolved function references are resolved. */
5595 gfc_resolve_expr (gfc_expr *e)
5603 /* inquiry_argument only applies to variables. */
5604 inquiry_save = inquiry_argument;
5605 if (e->expr_type != EXPR_VARIABLE)
5606 inquiry_argument = false;
5608 switch (e->expr_type)
5611 t = resolve_operator (e);
5617 if (check_host_association (e))
5618 t = resolve_function (e);
5621 t = resolve_variable (e);
5623 expression_rank (e);
5626 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5627 && e->ref->type != REF_SUBSTRING)
5628 gfc_resolve_substring_charlen (e);
5633 t = resolve_typebound_function (e);
5636 case EXPR_SUBSTRING:
5637 t = resolve_ref (e);
5646 t = resolve_expr_ppc (e);
5651 if (resolve_ref (e) == FAILURE)
5654 t = gfc_resolve_array_constructor (e);
5655 /* Also try to expand a constructor. */
5658 expression_rank (e);
5659 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
5660 gfc_expand_constructor (e);
5663 /* This provides the opportunity for the length of constructors with
5664 character valued function elements to propagate the string length
5665 to the expression. */
5666 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5668 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
5669 here rather then add a duplicate test for it above. */
5670 gfc_expand_constructor (e);
5671 t = gfc_resolve_character_array_constructor (e);
5676 case EXPR_STRUCTURE:
5677 t = resolve_ref (e);
5681 t = resolve_structure_cons (e);
5685 t = gfc_simplify_expr (e, 0);
5689 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5692 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5695 inquiry_argument = inquiry_save;
5701 /* Resolve an expression from an iterator. They must be scalar and have
5702 INTEGER or (optionally) REAL type. */
5705 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5706 const char *name_msgid)
5708 if (gfc_resolve_expr (expr) == FAILURE)
5711 if (expr->rank != 0)
5713 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5717 if (expr->ts.type != BT_INTEGER)
5719 if (expr->ts.type == BT_REAL)
5722 return gfc_notify_std (GFC_STD_F95_DEL,
5723 "Deleted feature: %s at %L must be integer",
5724 _(name_msgid), &expr->where);
5727 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5734 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5742 /* Resolve the expressions in an iterator structure. If REAL_OK is
5743 false allow only INTEGER type iterators, otherwise allow REAL types. */
5746 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5748 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5752 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5754 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5759 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5760 "Start expression in DO loop") == FAILURE)
5763 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5764 "End expression in DO loop") == FAILURE)
5767 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5768 "Step expression in DO loop") == FAILURE)
5771 if (iter->step->expr_type == EXPR_CONSTANT)
5773 if ((iter->step->ts.type == BT_INTEGER
5774 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5775 || (iter->step->ts.type == BT_REAL
5776 && mpfr_sgn (iter->step->value.real) == 0))
5778 gfc_error ("Step expression in DO loop at %L cannot be zero",
5779 &iter->step->where);
5784 /* Convert start, end, and step to the same type as var. */
5785 if (iter->start->ts.kind != iter->var->ts.kind
5786 || iter->start->ts.type != iter->var->ts.type)
5787 gfc_convert_type (iter->start, &iter->var->ts, 2);
5789 if (iter->end->ts.kind != iter->var->ts.kind
5790 || iter->end->ts.type != iter->var->ts.type)
5791 gfc_convert_type (iter->end, &iter->var->ts, 2);
5793 if (iter->step->ts.kind != iter->var->ts.kind
5794 || iter->step->ts.type != iter->var->ts.type)
5795 gfc_convert_type (iter->step, &iter->var->ts, 2);
5797 if (iter->start->expr_type == EXPR_CONSTANT
5798 && iter->end->expr_type == EXPR_CONSTANT
5799 && iter->step->expr_type == EXPR_CONSTANT)
5802 if (iter->start->ts.type == BT_INTEGER)
5804 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5805 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5809 sgn = mpfr_sgn (iter->step->value.real);
5810 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5812 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5813 gfc_warning ("DO loop at %L will be executed zero times",
5814 &iter->step->where);
5821 /* Traversal function for find_forall_index. f == 2 signals that
5822 that variable itself is not to be checked - only the references. */
5825 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5827 if (expr->expr_type != EXPR_VARIABLE)
5830 /* A scalar assignment */
5831 if (!expr->ref || *f == 1)
5833 if (expr->symtree->n.sym == sym)
5845 /* Check whether the FORALL index appears in the expression or not.
5846 Returns SUCCESS if SYM is found in EXPR. */
5849 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5851 if (gfc_traverse_expr (expr, sym, forall_index, f))
5858 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5859 to be a scalar INTEGER variable. The subscripts and stride are scalar
5860 INTEGERs, and if stride is a constant it must be nonzero.
5861 Furthermore "A subscript or stride in a forall-triplet-spec shall
5862 not contain a reference to any index-name in the
5863 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5866 resolve_forall_iterators (gfc_forall_iterator *it)
5868 gfc_forall_iterator *iter, *iter2;
5870 for (iter = it; iter; iter = iter->next)
5872 if (gfc_resolve_expr (iter->var) == SUCCESS
5873 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5874 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5877 if (gfc_resolve_expr (iter->start) == SUCCESS
5878 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5879 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5880 &iter->start->where);
5881 if (iter->var->ts.kind != iter->start->ts.kind)
5882 gfc_convert_type (iter->start, &iter->var->ts, 2);
5884 if (gfc_resolve_expr (iter->end) == SUCCESS
5885 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5886 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5888 if (iter->var->ts.kind != iter->end->ts.kind)
5889 gfc_convert_type (iter->end, &iter->var->ts, 2);
5891 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5893 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5894 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5895 &iter->stride->where, "INTEGER");
5897 if (iter->stride->expr_type == EXPR_CONSTANT
5898 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5899 gfc_error ("FORALL stride expression at %L cannot be zero",
5900 &iter->stride->where);
5902 if (iter->var->ts.kind != iter->stride->ts.kind)
5903 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5906 for (iter = it; iter; iter = iter->next)
5907 for (iter2 = iter; iter2; iter2 = iter2->next)
5909 if (find_forall_index (iter2->start,
5910 iter->var->symtree->n.sym, 0) == SUCCESS
5911 || find_forall_index (iter2->end,
5912 iter->var->symtree->n.sym, 0) == SUCCESS
5913 || find_forall_index (iter2->stride,
5914 iter->var->symtree->n.sym, 0) == SUCCESS)
5915 gfc_error ("FORALL index '%s' may not appear in triplet "
5916 "specification at %L", iter->var->symtree->name,
5917 &iter2->start->where);
5922 /* Given a pointer to a symbol that is a derived type, see if it's
5923 inaccessible, i.e. if it's defined in another module and the components are
5924 PRIVATE. The search is recursive if necessary. Returns zero if no
5925 inaccessible components are found, nonzero otherwise. */
5928 derived_inaccessible (gfc_symbol *sym)
5932 if (sym->attr.use_assoc && sym->attr.private_comp)
5935 for (c = sym->components; c; c = c->next)
5937 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
5945 /* Resolve the argument of a deallocate expression. The expression must be
5946 a pointer or a full array. */
5949 resolve_deallocate_expr (gfc_expr *e)
5951 symbol_attribute attr;
5952 int allocatable, pointer, check_intent_in;
5957 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5958 check_intent_in = 1;
5960 if (gfc_resolve_expr (e) == FAILURE)
5963 if (e->expr_type != EXPR_VARIABLE)
5966 sym = e->symtree->n.sym;
5968 if (sym->ts.type == BT_CLASS)
5970 allocatable = sym->ts.u.derived->components->attr.allocatable;
5971 pointer = sym->ts.u.derived->components->attr.pointer;
5975 allocatable = sym->attr.allocatable;
5976 pointer = sym->attr.pointer;
5978 for (ref = e->ref; ref; ref = ref->next)
5981 check_intent_in = 0;
5986 if (ref->u.ar.type != AR_FULL)
5991 c = ref->u.c.component;
5992 if (c->ts.type == BT_CLASS)
5994 allocatable = c->ts.u.derived->components->attr.allocatable;
5995 pointer = c->ts.u.derived->components->attr.pointer;
5999 allocatable = c->attr.allocatable;
6000 pointer = c->attr.pointer;
6010 attr = gfc_expr_attr (e);
6012 if (allocatable == 0 && attr.pointer == 0)
6015 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6019 if (check_intent_in && sym->attr.intent == INTENT_IN)
6021 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
6022 sym->name, &e->where);
6026 if (e->ts.type == BT_CLASS)
6028 /* Only deallocate the DATA component. */
6029 gfc_add_component_ref (e, "$data");
6036 /* Returns true if the expression e contains a reference to the symbol sym. */
6038 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6040 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6047 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6049 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6053 /* Given the expression node e for an allocatable/pointer of derived type to be
6054 allocated, get the expression node to be initialized afterwards (needed for
6055 derived types with default initializers, and derived types with allocatable
6056 components that need nullification.) */
6059 gfc_expr_to_initialize (gfc_expr *e)
6065 result = gfc_copy_expr (e);
6067 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6068 for (ref = result->ref; ref; ref = ref->next)
6069 if (ref->type == REF_ARRAY && ref->next == NULL)
6071 ref->u.ar.type = AR_FULL;
6073 for (i = 0; i < ref->u.ar.dimen; i++)
6074 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6076 result->rank = ref->u.ar.dimen;
6084 /* Used in resolve_allocate_expr to check that a allocation-object and
6085 a source-expr are conformable. This does not catch all possible
6086 cases; in particular a runtime checking is needed. */
6089 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6091 /* First compare rank. */
6092 if (e2->ref && e1->rank != e2->ref->u.ar.as->rank)
6094 gfc_error ("Source-expr at %L must be scalar or have the "
6095 "same rank as the allocate-object at %L",
6096 &e1->where, &e2->where);
6107 for (i = 0; i < e1->rank; i++)
6109 if (e2->ref->u.ar.end[i])
6111 mpz_set (s, e2->ref->u.ar.end[i]->value.integer);
6112 mpz_sub (s, s, e2->ref->u.ar.start[i]->value.integer);
6113 mpz_add_ui (s, s, 1);
6117 mpz_set (s, e2->ref->u.ar.start[i]->value.integer);
6120 if (mpz_cmp (e1->shape[i], s) != 0)
6122 gfc_error ("Source-expr at %L and allocate-object at %L must "
6123 "have the same shape", &e1->where, &e2->where);
6136 /* Resolve the expression in an ALLOCATE statement, doing the additional
6137 checks to see whether the expression is OK or not. The expression must
6138 have a trailing array reference that gives the size of the array. */
6141 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6143 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6145 symbol_attribute attr;
6146 gfc_ref *ref, *ref2;
6153 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6154 check_intent_in = 1;
6156 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6157 checking of coarrays. */
6158 for (ref = e->ref; ref; ref = ref->next)
6159 if (ref->next == NULL)
6162 if (ref && ref->type == REF_ARRAY)
6163 ref->u.ar.in_allocate = true;
6165 if (gfc_resolve_expr (e) == FAILURE)
6168 /* Make sure the expression is allocatable or a pointer. If it is
6169 pointer, the next-to-last reference must be a pointer. */
6173 sym = e->symtree->n.sym;
6175 /* Check whether ultimate component is abstract and CLASS. */
6178 if (e->expr_type != EXPR_VARIABLE)
6181 attr = gfc_expr_attr (e);
6182 pointer = attr.pointer;
6183 dimension = attr.dimension;
6184 codimension = attr.codimension;
6188 if (sym->ts.type == BT_CLASS)
6190 allocatable = sym->ts.u.derived->components->attr.allocatable;
6191 pointer = sym->ts.u.derived->components->attr.pointer;
6192 dimension = sym->ts.u.derived->components->attr.dimension;
6193 codimension = sym->ts.u.derived->components->attr.codimension;
6194 is_abstract = sym->ts.u.derived->components->attr.abstract;
6198 allocatable = sym->attr.allocatable;
6199 pointer = sym->attr.pointer;
6200 dimension = sym->attr.dimension;
6201 codimension = sym->attr.codimension;
6204 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6207 check_intent_in = 0;
6212 if (ref->next != NULL)
6218 if (gfc_is_coindexed (e))
6220 gfc_error ("Coindexed allocatable object at %L",
6225 c = ref->u.c.component;
6226 if (c->ts.type == BT_CLASS)
6228 allocatable = c->ts.u.derived->components->attr.allocatable;
6229 pointer = c->ts.u.derived->components->attr.pointer;
6230 dimension = c->ts.u.derived->components->attr.dimension;
6231 codimension = c->ts.u.derived->components->attr.codimension;
6232 is_abstract = c->ts.u.derived->components->attr.abstract;
6236 allocatable = c->attr.allocatable;
6237 pointer = c->attr.pointer;
6238 dimension = c->attr.dimension;
6239 codimension = c->attr.codimension;
6240 is_abstract = c->attr.abstract;
6252 if (allocatable == 0 && pointer == 0)
6254 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6259 /* Some checks for the SOURCE tag. */
6262 /* Check F03:C631. */
6263 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6265 gfc_error ("Type of entity at %L is type incompatible with "
6266 "source-expr at %L", &e->where, &code->expr3->where);
6270 /* Check F03:C632 and restriction following Note 6.18. */
6271 if (code->expr3->rank > 0
6272 && conformable_arrays (code->expr3, e) == FAILURE)
6275 /* Check F03:C633. */
6276 if (code->expr3->ts.kind != e->ts.kind)
6278 gfc_error ("The allocate-object at %L and the source-expr at %L "
6279 "shall have the same kind type parameter",
6280 &e->where, &code->expr3->where);
6284 else if (is_abstract&& code->ext.alloc.ts.type == BT_UNKNOWN)
6286 gcc_assert (e->ts.type == BT_CLASS);
6287 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6288 "type-spec or SOURCE=", sym->name, &e->where);
6292 if (check_intent_in && sym->attr.intent == INTENT_IN)
6294 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6295 sym->name, &e->where);
6301 /* Add default initializer for those derived types that need them. */
6302 if (e->ts.type == BT_DERIVED
6303 && (init_e = gfc_default_initializer (&e->ts)))
6305 gfc_code *init_st = gfc_get_code ();
6306 init_st->loc = code->loc;
6307 init_st->op = EXEC_INIT_ASSIGN;
6308 init_st->expr1 = gfc_expr_to_initialize (e);
6309 init_st->expr2 = init_e;
6310 init_st->next = code->next;
6311 code->next = init_st;
6313 else if (e->ts.type == BT_CLASS
6314 && ((code->ext.alloc.ts.type == BT_UNKNOWN
6315 && (init_e = gfc_default_initializer (&e->ts.u.derived->components->ts)))
6316 || (code->ext.alloc.ts.type == BT_DERIVED
6317 && (init_e = gfc_default_initializer (&code->ext.alloc.ts)))))
6319 gfc_code *init_st = gfc_get_code ();
6320 init_st->loc = code->loc;
6321 init_st->op = EXEC_INIT_ASSIGN;
6322 init_st->expr1 = gfc_expr_to_initialize (e);
6323 init_st->expr2 = init_e;
6324 init_st->next = code->next;
6325 code->next = init_st;
6329 if (pointer || (dimension == 0 && codimension == 0))
6332 /* Make sure the next-to-last reference node is an array specification. */
6334 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6335 || (dimension && ref2->u.ar.dimen == 0))
6337 gfc_error ("Array specification required in ALLOCATE statement "
6338 "at %L", &e->where);
6342 /* Make sure that the array section reference makes sense in the
6343 context of an ALLOCATE specification. */
6347 if (codimension && ar->codimen == 0)
6349 gfc_error ("Coarray specification required in ALLOCATE statement "
6350 "at %L", &e->where);
6354 for (i = 0; i < ar->dimen; i++)
6356 if (ref2->u.ar.type == AR_ELEMENT)
6359 switch (ar->dimen_type[i])
6365 if (ar->start[i] != NULL
6366 && ar->end[i] != NULL
6367 && ar->stride[i] == NULL)
6370 /* Fall Through... */
6375 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6381 for (a = code->ext.alloc.list; a; a = a->next)
6383 sym = a->expr->symtree->n.sym;
6385 /* TODO - check derived type components. */
6386 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6389 if ((ar->start[i] != NULL
6390 && gfc_find_sym_in_expr (sym, ar->start[i]))
6391 || (ar->end[i] != NULL
6392 && gfc_find_sym_in_expr (sym, ar->end[i])))
6394 gfc_error ("'%s' must not appear in the array specification at "
6395 "%L in the same ALLOCATE statement where it is "
6396 "itself allocated", sym->name, &ar->where);
6402 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6404 if (ar->dimen_type[i] == DIMEN_ELEMENT
6405 || ar->dimen_type[i] == DIMEN_RANGE)
6407 if (i == (ar->dimen + ar->codimen - 1))
6409 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6410 "statement at %L", &e->where);
6416 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6417 && ar->stride[i] == NULL)
6420 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6425 if (codimension && ar->as->rank == 0)
6427 gfc_error ("Sorry, allocatable scalar coarrays are not yet supported "
6428 "at %L", &e->where);
6440 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6442 gfc_expr *stat, *errmsg, *pe, *qe;
6443 gfc_alloc *a, *p, *q;
6445 stat = code->expr1 ? code->expr1 : NULL;
6447 errmsg = code->expr2 ? code->expr2 : NULL;
6449 /* Check the stat variable. */
6452 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6453 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6454 stat->symtree->n.sym->name, &stat->where);
6456 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6457 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6460 if ((stat->ts.type != BT_INTEGER
6461 && !(stat->ref && (stat->ref->type == REF_ARRAY
6462 || stat->ref->type == REF_COMPONENT)))
6464 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6465 "variable", &stat->where);
6467 for (p = code->ext.alloc.list; p; p = p->next)
6468 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6469 gfc_error ("Stat-variable at %L shall not be %sd within "
6470 "the same %s statement", &stat->where, fcn, fcn);
6473 /* Check the errmsg variable. */
6477 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6480 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6481 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6482 errmsg->symtree->n.sym->name, &errmsg->where);
6484 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6485 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6488 if ((errmsg->ts.type != BT_CHARACTER
6490 && (errmsg->ref->type == REF_ARRAY
6491 || errmsg->ref->type == REF_COMPONENT)))
6492 || errmsg->rank > 0 )
6493 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6494 "variable", &errmsg->where);
6496 for (p = code->ext.alloc.list; p; p = p->next)
6497 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6498 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6499 "the same %s statement", &errmsg->where, fcn, fcn);
6502 /* Check that an allocate-object appears only once in the statement.
6503 FIXME: Checking derived types is disabled. */
6504 for (p = code->ext.alloc.list; p; p = p->next)
6507 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6508 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6510 for (q = p->next; q; q = q->next)
6513 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6514 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6515 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6516 gfc_error ("Allocate-object at %L also appears at %L",
6517 &pe->where, &qe->where);
6522 if (strcmp (fcn, "ALLOCATE") == 0)
6524 for (a = code->ext.alloc.list; a; a = a->next)
6525 resolve_allocate_expr (a->expr, code);
6529 for (a = code->ext.alloc.list; a; a = a->next)
6530 resolve_deallocate_expr (a->expr);
6535 /************ SELECT CASE resolution subroutines ************/
6537 /* Callback function for our mergesort variant. Determines interval
6538 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6539 op1 > op2. Assumes we're not dealing with the default case.
6540 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6541 There are nine situations to check. */
6544 compare_cases (const gfc_case *op1, const gfc_case *op2)
6548 if (op1->low == NULL) /* op1 = (:L) */
6550 /* op2 = (:N), so overlap. */
6552 /* op2 = (M:) or (M:N), L < M */
6553 if (op2->low != NULL
6554 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6557 else if (op1->high == NULL) /* op1 = (K:) */
6559 /* op2 = (M:), so overlap. */
6561 /* op2 = (:N) or (M:N), K > N */
6562 if (op2->high != NULL
6563 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6566 else /* op1 = (K:L) */
6568 if (op2->low == NULL) /* op2 = (:N), K > N */
6569 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6571 else if (op2->high == NULL) /* op2 = (M:), L < M */
6572 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6574 else /* op2 = (M:N) */
6578 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6581 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6590 /* Merge-sort a double linked case list, detecting overlap in the
6591 process. LIST is the head of the double linked case list before it
6592 is sorted. Returns the head of the sorted list if we don't see any
6593 overlap, or NULL otherwise. */
6596 check_case_overlap (gfc_case *list)
6598 gfc_case *p, *q, *e, *tail;
6599 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6601 /* If the passed list was empty, return immediately. */
6608 /* Loop unconditionally. The only exit from this loop is a return
6609 statement, when we've finished sorting the case list. */
6616 /* Count the number of merges we do in this pass. */
6619 /* Loop while there exists a merge to be done. */
6624 /* Count this merge. */
6627 /* Cut the list in two pieces by stepping INSIZE places
6628 forward in the list, starting from P. */
6631 for (i = 0; i < insize; i++)
6640 /* Now we have two lists. Merge them! */
6641 while (psize > 0 || (qsize > 0 && q != NULL))
6643 /* See from which the next case to merge comes from. */
6646 /* P is empty so the next case must come from Q. */
6651 else if (qsize == 0 || q == NULL)
6660 cmp = compare_cases (p, q);
6663 /* The whole case range for P is less than the
6671 /* The whole case range for Q is greater than
6672 the case range for P. */
6679 /* The cases overlap, or they are the same
6680 element in the list. Either way, we must
6681 issue an error and get the next case from P. */
6682 /* FIXME: Sort P and Q by line number. */
6683 gfc_error ("CASE label at %L overlaps with CASE "
6684 "label at %L", &p->where, &q->where);
6692 /* Add the next element to the merged list. */
6701 /* P has now stepped INSIZE places along, and so has Q. So
6702 they're the same. */
6707 /* If we have done only one merge or none at all, we've
6708 finished sorting the cases. */
6717 /* Otherwise repeat, merging lists twice the size. */
6723 /* Check to see if an expression is suitable for use in a CASE statement.
6724 Makes sure that all case expressions are scalar constants of the same
6725 type. Return FAILURE if anything is wrong. */
6728 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6730 if (e == NULL) return SUCCESS;
6732 if (e->ts.type != case_expr->ts.type)
6734 gfc_error ("Expression in CASE statement at %L must be of type %s",
6735 &e->where, gfc_basic_typename (case_expr->ts.type));
6739 /* C805 (R808) For a given case-construct, each case-value shall be of
6740 the same type as case-expr. For character type, length differences
6741 are allowed, but the kind type parameters shall be the same. */
6743 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6745 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6746 &e->where, case_expr->ts.kind);
6750 /* Convert the case value kind to that of case expression kind, if needed.
6751 FIXME: Should a warning be issued? */
6752 if (e->ts.kind != case_expr->ts.kind)
6753 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6757 gfc_error ("Expression in CASE statement at %L must be scalar",
6766 /* Given a completely parsed select statement, we:
6768 - Validate all expressions and code within the SELECT.
6769 - Make sure that the selection expression is not of the wrong type.
6770 - Make sure that no case ranges overlap.
6771 - Eliminate unreachable cases and unreachable code resulting from
6772 removing case labels.
6774 The standard does allow unreachable cases, e.g. CASE (5:3). But
6775 they are a hassle for code generation, and to prevent that, we just
6776 cut them out here. This is not necessary for overlapping cases
6777 because they are illegal and we never even try to generate code.
6779 We have the additional caveat that a SELECT construct could have
6780 been a computed GOTO in the source code. Fortunately we can fairly
6781 easily work around that here: The case_expr for a "real" SELECT CASE
6782 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6783 we have to do is make sure that the case_expr is a scalar integer
6787 resolve_select (gfc_code *code)
6790 gfc_expr *case_expr;
6791 gfc_case *cp, *default_case, *tail, *head;
6792 int seen_unreachable;
6798 if (code->expr1 == NULL)
6800 /* This was actually a computed GOTO statement. */
6801 case_expr = code->expr2;
6802 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6803 gfc_error ("Selection expression in computed GOTO statement "
6804 "at %L must be a scalar integer expression",
6807 /* Further checking is not necessary because this SELECT was built
6808 by the compiler, so it should always be OK. Just move the
6809 case_expr from expr2 to expr so that we can handle computed
6810 GOTOs as normal SELECTs from here on. */
6811 code->expr1 = code->expr2;
6816 case_expr = code->expr1;
6818 type = case_expr->ts.type;
6819 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6821 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6822 &case_expr->where, gfc_typename (&case_expr->ts));
6824 /* Punt. Going on here just produce more garbage error messages. */
6828 if (case_expr->rank != 0)
6830 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6831 "expression", &case_expr->where);
6837 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6838 of the SELECT CASE expression and its CASE values. Walk the lists
6839 of case values, and if we find a mismatch, promote case_expr to
6840 the appropriate kind. */
6842 if (type == BT_LOGICAL || type == BT_INTEGER)
6844 for (body = code->block; body; body = body->block)
6846 /* Walk the case label list. */
6847 for (cp = body->ext.case_list; cp; cp = cp->next)
6849 /* Intercept the DEFAULT case. It does not have a kind. */
6850 if (cp->low == NULL && cp->high == NULL)
6853 /* Unreachable case ranges are discarded, so ignore. */
6854 if (cp->low != NULL && cp->high != NULL
6855 && cp->low != cp->high
6856 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6859 /* FIXME: Should a warning be issued? */
6861 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6862 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6864 if (cp->high != NULL
6865 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6866 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6871 /* Assume there is no DEFAULT case. */
6872 default_case = NULL;
6877 for (body = code->block; body; body = body->block)
6879 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6881 seen_unreachable = 0;
6883 /* Walk the case label list, making sure that all case labels
6885 for (cp = body->ext.case_list; cp; cp = cp->next)
6887 /* Count the number of cases in the whole construct. */
6890 /* Intercept the DEFAULT case. */
6891 if (cp->low == NULL && cp->high == NULL)
6893 if (default_case != NULL)
6895 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6896 "by a second DEFAULT CASE at %L",
6897 &default_case->where, &cp->where);
6908 /* Deal with single value cases and case ranges. Errors are
6909 issued from the validation function. */
6910 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
6911 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
6917 if (type == BT_LOGICAL
6918 && ((cp->low == NULL || cp->high == NULL)
6919 || cp->low != cp->high))
6921 gfc_error ("Logical range in CASE statement at %L is not "
6922 "allowed", &cp->low->where);
6927 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
6930 value = cp->low->value.logical == 0 ? 2 : 1;
6931 if (value & seen_logical)
6933 gfc_error ("constant logical value in CASE statement "
6934 "is repeated at %L",
6939 seen_logical |= value;
6942 if (cp->low != NULL && cp->high != NULL
6943 && cp->low != cp->high
6944 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6946 if (gfc_option.warn_surprising)
6947 gfc_warning ("Range specification at %L can never "
6948 "be matched", &cp->where);
6950 cp->unreachable = 1;
6951 seen_unreachable = 1;
6955 /* If the case range can be matched, it can also overlap with
6956 other cases. To make sure it does not, we put it in a
6957 double linked list here. We sort that with a merge sort
6958 later on to detect any overlapping cases. */
6962 head->right = head->left = NULL;
6967 tail->right->left = tail;
6974 /* It there was a failure in the previous case label, give up
6975 for this case label list. Continue with the next block. */
6979 /* See if any case labels that are unreachable have been seen.
6980 If so, we eliminate them. This is a bit of a kludge because
6981 the case lists for a single case statement (label) is a
6982 single forward linked lists. */
6983 if (seen_unreachable)
6985 /* Advance until the first case in the list is reachable. */
6986 while (body->ext.case_list != NULL
6987 && body->ext.case_list->unreachable)
6989 gfc_case *n = body->ext.case_list;
6990 body->ext.case_list = body->ext.case_list->next;
6992 gfc_free_case_list (n);
6995 /* Strip all other unreachable cases. */
6996 if (body->ext.case_list)
6998 for (cp = body->ext.case_list; cp->next; cp = cp->next)
7000 if (cp->next->unreachable)
7002 gfc_case *n = cp->next;
7003 cp->next = cp->next->next;
7005 gfc_free_case_list (n);
7012 /* See if there were overlapping cases. If the check returns NULL,
7013 there was overlap. In that case we don't do anything. If head
7014 is non-NULL, we prepend the DEFAULT case. The sorted list can
7015 then used during code generation for SELECT CASE constructs with
7016 a case expression of a CHARACTER type. */
7019 head = check_case_overlap (head);
7021 /* Prepend the default_case if it is there. */
7022 if (head != NULL && default_case)
7024 default_case->left = NULL;
7025 default_case->right = head;
7026 head->left = default_case;
7030 /* Eliminate dead blocks that may be the result if we've seen
7031 unreachable case labels for a block. */
7032 for (body = code; body && body->block; body = body->block)
7034 if (body->block->ext.case_list == NULL)
7036 /* Cut the unreachable block from the code chain. */
7037 gfc_code *c = body->block;
7038 body->block = c->block;
7040 /* Kill the dead block, but not the blocks below it. */
7042 gfc_free_statements (c);
7046 /* More than two cases is legal but insane for logical selects.
7047 Issue a warning for it. */
7048 if (gfc_option.warn_surprising && type == BT_LOGICAL
7050 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7055 /* Check if a derived type is extensible. */
7058 gfc_type_is_extensible (gfc_symbol *sym)
7060 return !(sym->attr.is_bind_c || sym->attr.sequence);
7064 /* Resolve a SELECT TYPE statement. */
7067 resolve_select_type (gfc_code *code)
7069 gfc_symbol *selector_type;
7070 gfc_code *body, *new_st, *if_st, *tail;
7071 gfc_code *class_is = NULL, *default_case = NULL;
7074 char name[GFC_MAX_SYMBOL_LEN];
7082 selector_type = code->expr2->ts.u.derived->components->ts.u.derived;
7084 selector_type = code->expr1->ts.u.derived->components->ts.u.derived;
7086 /* Loop over TYPE IS / CLASS IS cases. */
7087 for (body = code->block; body; body = body->block)
7089 c = body->ext.case_list;
7091 /* Check F03:C815. */
7092 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7093 && !gfc_type_is_extensible (c->ts.u.derived))
7095 gfc_error ("Derived type '%s' at %L must be extensible",
7096 c->ts.u.derived->name, &c->where);
7101 /* Check F03:C816. */
7102 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7103 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7105 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7106 c->ts.u.derived->name, &c->where, selector_type->name);
7111 /* Intercept the DEFAULT case. */
7112 if (c->ts.type == BT_UNKNOWN)
7114 /* Check F03:C818. */
7117 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7118 "by a second DEFAULT CASE at %L",
7119 &default_case->ext.case_list->where, &c->where);
7124 default_case = body;
7133 /* Insert assignment for selector variable. */
7134 new_st = gfc_get_code ();
7135 new_st->op = EXEC_ASSIGN;
7136 new_st->expr1 = gfc_copy_expr (code->expr1);
7137 new_st->expr2 = gfc_copy_expr (code->expr2);
7141 /* Put SELECT TYPE statement inside a BLOCK. */
7142 new_st = gfc_get_code ();
7143 new_st->op = code->op;
7144 new_st->expr1 = code->expr1;
7145 new_st->expr2 = code->expr2;
7146 new_st->block = code->block;
7150 ns->code->next = new_st;
7151 code->op = EXEC_BLOCK;
7152 code->expr1 = code->expr2 = NULL;
7157 /* Transform to EXEC_SELECT. */
7158 code->op = EXEC_SELECT;
7159 gfc_add_component_ref (code->expr1, "$vptr");
7160 gfc_add_component_ref (code->expr1, "$hash");
7162 /* Loop over TYPE IS / CLASS IS cases. */
7163 for (body = code->block; body; body = body->block)
7165 c = body->ext.case_list;
7167 if (c->ts.type == BT_DERIVED)
7168 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7169 c->ts.u.derived->hash_value);
7171 else if (c->ts.type == BT_UNKNOWN)
7174 /* Assign temporary to selector. */
7175 if (c->ts.type == BT_CLASS)
7176 sprintf (name, "tmp$class$%s", c->ts.u.derived->name);
7178 sprintf (name, "tmp$type$%s", c->ts.u.derived->name);
7179 st = gfc_find_symtree (ns->sym_root, name);
7180 new_st = gfc_get_code ();
7181 new_st->expr1 = gfc_get_variable_expr (st);
7182 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
7183 if (c->ts.type == BT_DERIVED)
7185 new_st->op = EXEC_POINTER_ASSIGN;
7186 gfc_add_component_ref (new_st->expr2, "$data");
7189 new_st->op = EXEC_POINTER_ASSIGN;
7190 new_st->next = body->next;
7191 body->next = new_st;
7194 /* Take out CLASS IS cases for separate treatment. */
7196 while (body && body->block)
7198 if (body->block->ext.case_list->ts.type == BT_CLASS)
7200 /* Add to class_is list. */
7201 if (class_is == NULL)
7203 class_is = body->block;
7208 for (tail = class_is; tail->block; tail = tail->block) ;
7209 tail->block = body->block;
7212 /* Remove from EXEC_SELECT list. */
7213 body->block = body->block->block;
7226 /* Add a default case to hold the CLASS IS cases. */
7227 for (tail = code; tail->block; tail = tail->block) ;
7228 tail->block = gfc_get_code ();
7230 tail->op = EXEC_SELECT_TYPE;
7231 tail->ext.case_list = gfc_get_case ();
7232 tail->ext.case_list->ts.type = BT_UNKNOWN;
7234 default_case = tail;
7237 /* More than one CLASS IS block? */
7238 if (class_is->block)
7242 /* Sort CLASS IS blocks by extension level. */
7246 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7249 /* F03:C817 (check for doubles). */
7250 if ((*c1)->ext.case_list->ts.u.derived->hash_value
7251 == c2->ext.case_list->ts.u.derived->hash_value)
7253 gfc_error ("Double CLASS IS block in SELECT TYPE "
7254 "statement at %L", &c2->ext.case_list->where);
7257 if ((*c1)->ext.case_list->ts.u.derived->attr.extension
7258 < c2->ext.case_list->ts.u.derived->attr.extension)
7261 (*c1)->block = c2->block;
7271 /* Generate IF chain. */
7272 if_st = gfc_get_code ();
7273 if_st->op = EXEC_IF;
7275 for (body = class_is; body; body = body->block)
7277 new_st->block = gfc_get_code ();
7278 new_st = new_st->block;
7279 new_st->op = EXEC_IF;
7280 /* Set up IF condition: Call _gfortran_is_extension_of. */
7281 new_st->expr1 = gfc_get_expr ();
7282 new_st->expr1->expr_type = EXPR_FUNCTION;
7283 new_st->expr1->ts.type = BT_LOGICAL;
7284 new_st->expr1->ts.kind = 4;
7285 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
7286 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
7287 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
7288 /* Set up arguments. */
7289 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
7290 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
7291 gfc_add_component_ref (new_st->expr1->value.function.actual->expr, "$vptr");
7292 vtab = gfc_find_derived_vtab (body->ext.case_list->ts.u.derived, true);
7293 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
7294 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
7295 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
7296 new_st->next = body->next;
7298 if (default_case->next)
7300 new_st->block = gfc_get_code ();
7301 new_st = new_st->block;
7302 new_st->op = EXEC_IF;
7303 new_st->next = default_case->next;
7306 /* Replace CLASS DEFAULT code by the IF chain. */
7307 default_case->next = if_st;
7310 resolve_select (code);
7315 /* Resolve a transfer statement. This is making sure that:
7316 -- a derived type being transferred has only non-pointer components
7317 -- a derived type being transferred doesn't have private components, unless
7318 it's being transferred from the module where the type was defined
7319 -- we're not trying to transfer a whole assumed size array. */
7322 resolve_transfer (gfc_code *code)
7331 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
7334 sym = exp->symtree->n.sym;
7337 /* Go to actual component transferred. */
7338 for (ref = code->expr1->ref; ref; ref = ref->next)
7339 if (ref->type == REF_COMPONENT)
7340 ts = &ref->u.c.component->ts;
7342 if (ts->type == BT_DERIVED)
7344 /* Check that transferred derived type doesn't contain POINTER
7346 if (ts->u.derived->attr.pointer_comp)
7348 gfc_error ("Data transfer element at %L cannot have "
7349 "POINTER components", &code->loc);
7353 if (ts->u.derived->attr.alloc_comp)
7355 gfc_error ("Data transfer element at %L cannot have "
7356 "ALLOCATABLE components", &code->loc);
7360 if (derived_inaccessible (ts->u.derived))
7362 gfc_error ("Data transfer element at %L cannot have "
7363 "PRIVATE components",&code->loc);
7368 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7369 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7371 gfc_error ("Data transfer element at %L cannot be a full reference to "
7372 "an assumed-size array", &code->loc);
7378 /*********** Toplevel code resolution subroutines ***********/
7380 /* Find the set of labels that are reachable from this block. We also
7381 record the last statement in each block. */
7384 find_reachable_labels (gfc_code *block)
7391 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7393 /* Collect labels in this block. We don't keep those corresponding
7394 to END {IF|SELECT}, these are checked in resolve_branch by going
7395 up through the code_stack. */
7396 for (c = block; c; c = c->next)
7398 if (c->here && c->op != EXEC_END_BLOCK)
7399 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7402 /* Merge with labels from parent block. */
7405 gcc_assert (cs_base->prev->reachable_labels);
7406 bitmap_ior_into (cs_base->reachable_labels,
7407 cs_base->prev->reachable_labels);
7413 resolve_sync (gfc_code *code)
7415 /* Check imageset. The * case matches expr1 == NULL. */
7418 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
7419 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
7420 "INTEGER expression", &code->expr1->where);
7421 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
7422 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
7423 gfc_error ("Imageset argument at %L must between 1 and num_images()",
7424 &code->expr1->where);
7425 else if (code->expr1->expr_type == EXPR_ARRAY
7426 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
7428 gfc_constructor *cons;
7429 cons = gfc_constructor_first (code->expr1->value.constructor);
7430 for (; cons; cons = gfc_constructor_next (cons))
7431 if (cons->expr->expr_type == EXPR_CONSTANT
7432 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
7433 gfc_error ("Imageset argument at %L must between 1 and "
7434 "num_images()", &cons->expr->where);
7440 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
7441 || code->expr2->expr_type != EXPR_VARIABLE))
7442 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
7443 &code->expr2->where);
7447 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
7448 || code->expr3->expr_type != EXPR_VARIABLE))
7449 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
7450 &code->expr3->where);
7454 /* Given a branch to a label, see if the branch is conforming.
7455 The code node describes where the branch is located. */
7458 resolve_branch (gfc_st_label *label, gfc_code *code)
7465 /* Step one: is this a valid branching target? */
7467 if (label->defined == ST_LABEL_UNKNOWN)
7469 gfc_error ("Label %d referenced at %L is never defined", label->value,
7474 if (label->defined != ST_LABEL_TARGET)
7476 gfc_error ("Statement at %L is not a valid branch target statement "
7477 "for the branch statement at %L", &label->where, &code->loc);
7481 /* Step two: make sure this branch is not a branch to itself ;-) */
7483 if (code->here == label)
7485 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7489 /* Step three: See if the label is in the same block as the
7490 branching statement. The hard work has been done by setting up
7491 the bitmap reachable_labels. */
7493 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7495 /* Check now whether there is a CRITICAL construct; if so, check
7496 whether the label is still visible outside of the CRITICAL block,
7497 which is invalid. */
7498 for (stack = cs_base; stack; stack = stack->prev)
7499 if (stack->current->op == EXEC_CRITICAL
7500 && bitmap_bit_p (stack->reachable_labels, label->value))
7501 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7502 " at %L", &code->loc, &label->where);
7507 /* Step four: If we haven't found the label in the bitmap, it may
7508 still be the label of the END of the enclosing block, in which
7509 case we find it by going up the code_stack. */
7511 for (stack = cs_base; stack; stack = stack->prev)
7513 if (stack->current->next && stack->current->next->here == label)
7515 if (stack->current->op == EXEC_CRITICAL)
7517 /* Note: A label at END CRITICAL does not leave the CRITICAL
7518 construct as END CRITICAL is still part of it. */
7519 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7520 " at %L", &code->loc, &label->where);
7527 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7531 /* The label is not in an enclosing block, so illegal. This was
7532 allowed in Fortran 66, so we allow it as extension. No
7533 further checks are necessary in this case. */
7534 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7535 "as the GOTO statement at %L", &label->where,
7541 /* Check whether EXPR1 has the same shape as EXPR2. */
7544 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7546 mpz_t shape[GFC_MAX_DIMENSIONS];
7547 mpz_t shape2[GFC_MAX_DIMENSIONS];
7548 gfc_try result = FAILURE;
7551 /* Compare the rank. */
7552 if (expr1->rank != expr2->rank)
7555 /* Compare the size of each dimension. */
7556 for (i=0; i<expr1->rank; i++)
7558 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7561 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7564 if (mpz_cmp (shape[i], shape2[i]))
7568 /* When either of the two expression is an assumed size array, we
7569 ignore the comparison of dimension sizes. */
7574 for (i--; i >= 0; i--)
7576 mpz_clear (shape[i]);
7577 mpz_clear (shape2[i]);
7583 /* Check whether a WHERE assignment target or a WHERE mask expression
7584 has the same shape as the outmost WHERE mask expression. */
7587 resolve_where (gfc_code *code, gfc_expr *mask)
7593 cblock = code->block;
7595 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7596 In case of nested WHERE, only the outmost one is stored. */
7597 if (mask == NULL) /* outmost WHERE */
7599 else /* inner WHERE */
7606 /* Check if the mask-expr has a consistent shape with the
7607 outmost WHERE mask-expr. */
7608 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7609 gfc_error ("WHERE mask at %L has inconsistent shape",
7610 &cblock->expr1->where);
7613 /* the assignment statement of a WHERE statement, or the first
7614 statement in where-body-construct of a WHERE construct */
7615 cnext = cblock->next;
7620 /* WHERE assignment statement */
7623 /* Check shape consistent for WHERE assignment target. */
7624 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7625 gfc_error ("WHERE assignment target at %L has "
7626 "inconsistent shape", &cnext->expr1->where);
7630 case EXEC_ASSIGN_CALL:
7631 resolve_call (cnext);
7632 if (!cnext->resolved_sym->attr.elemental)
7633 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7634 &cnext->ext.actual->expr->where);
7637 /* WHERE or WHERE construct is part of a where-body-construct */
7639 resolve_where (cnext, e);
7643 gfc_error ("Unsupported statement inside WHERE at %L",
7646 /* the next statement within the same where-body-construct */
7647 cnext = cnext->next;
7649 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7650 cblock = cblock->block;
7655 /* Resolve assignment in FORALL construct.
7656 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7657 FORALL index variables. */
7660 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7664 for (n = 0; n < nvar; n++)
7666 gfc_symbol *forall_index;
7668 forall_index = var_expr[n]->symtree->n.sym;
7670 /* Check whether the assignment target is one of the FORALL index
7672 if ((code->expr1->expr_type == EXPR_VARIABLE)
7673 && (code->expr1->symtree->n.sym == forall_index))
7674 gfc_error ("Assignment to a FORALL index variable at %L",
7675 &code->expr1->where);
7678 /* If one of the FORALL index variables doesn't appear in the
7679 assignment variable, then there could be a many-to-one
7680 assignment. Emit a warning rather than an error because the
7681 mask could be resolving this problem. */
7682 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7683 gfc_warning ("The FORALL with index '%s' is not used on the "
7684 "left side of the assignment at %L and so might "
7685 "cause multiple assignment to this object",
7686 var_expr[n]->symtree->name, &code->expr1->where);
7692 /* Resolve WHERE statement in FORALL construct. */
7695 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7696 gfc_expr **var_expr)
7701 cblock = code->block;
7704 /* the assignment statement of a WHERE statement, or the first
7705 statement in where-body-construct of a WHERE construct */
7706 cnext = cblock->next;
7711 /* WHERE assignment statement */
7713 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7716 /* WHERE operator assignment statement */
7717 case EXEC_ASSIGN_CALL:
7718 resolve_call (cnext);
7719 if (!cnext->resolved_sym->attr.elemental)
7720 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7721 &cnext->ext.actual->expr->where);
7724 /* WHERE or WHERE construct is part of a where-body-construct */
7726 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7730 gfc_error ("Unsupported statement inside WHERE at %L",
7733 /* the next statement within the same where-body-construct */
7734 cnext = cnext->next;
7736 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7737 cblock = cblock->block;
7742 /* Traverse the FORALL body to check whether the following errors exist:
7743 1. For assignment, check if a many-to-one assignment happens.
7744 2. For WHERE statement, check the WHERE body to see if there is any
7745 many-to-one assignment. */
7748 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7752 c = code->block->next;
7758 case EXEC_POINTER_ASSIGN:
7759 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7762 case EXEC_ASSIGN_CALL:
7766 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7767 there is no need to handle it here. */
7771 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7776 /* The next statement in the FORALL body. */
7782 /* Counts the number of iterators needed inside a forall construct, including
7783 nested forall constructs. This is used to allocate the needed memory
7784 in gfc_resolve_forall. */
7787 gfc_count_forall_iterators (gfc_code *code)
7789 int max_iters, sub_iters, current_iters;
7790 gfc_forall_iterator *fa;
7792 gcc_assert(code->op == EXEC_FORALL);
7796 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7799 code = code->block->next;
7803 if (code->op == EXEC_FORALL)
7805 sub_iters = gfc_count_forall_iterators (code);
7806 if (sub_iters > max_iters)
7807 max_iters = sub_iters;
7812 return current_iters + max_iters;
7816 /* Given a FORALL construct, first resolve the FORALL iterator, then call
7817 gfc_resolve_forall_body to resolve the FORALL body. */
7820 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
7822 static gfc_expr **var_expr;
7823 static int total_var = 0;
7824 static int nvar = 0;
7826 gfc_forall_iterator *fa;
7831 /* Start to resolve a FORALL construct */
7832 if (forall_save == 0)
7834 /* Count the total number of FORALL index in the nested FORALL
7835 construct in order to allocate the VAR_EXPR with proper size. */
7836 total_var = gfc_count_forall_iterators (code);
7838 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
7839 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
7842 /* The information about FORALL iterator, including FORALL index start, end
7843 and stride. The FORALL index can not appear in start, end or stride. */
7844 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7846 /* Check if any outer FORALL index name is the same as the current
7848 for (i = 0; i < nvar; i++)
7850 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
7852 gfc_error ("An outer FORALL construct already has an index "
7853 "with this name %L", &fa->var->where);
7857 /* Record the current FORALL index. */
7858 var_expr[nvar] = gfc_copy_expr (fa->var);
7862 /* No memory leak. */
7863 gcc_assert (nvar <= total_var);
7866 /* Resolve the FORALL body. */
7867 gfc_resolve_forall_body (code, nvar, var_expr);
7869 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
7870 gfc_resolve_blocks (code->block, ns);
7874 /* Free only the VAR_EXPRs allocated in this frame. */
7875 for (i = nvar; i < tmp; i++)
7876 gfc_free_expr (var_expr[i]);
7880 /* We are in the outermost FORALL construct. */
7881 gcc_assert (forall_save == 0);
7883 /* VAR_EXPR is not needed any more. */
7884 gfc_free (var_expr);
7890 /* Resolve a BLOCK construct statement. */
7893 resolve_block_construct (gfc_code* code)
7895 /* Eventually, we may want to do some checks here or handle special stuff.
7896 But so far the only thing we can do is resolving the local namespace. */
7898 gfc_resolve (code->ext.ns);
7902 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
7905 static void resolve_code (gfc_code *, gfc_namespace *);
7908 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
7912 for (; b; b = b->block)
7914 t = gfc_resolve_expr (b->expr1);
7915 if (gfc_resolve_expr (b->expr2) == FAILURE)
7921 if (t == SUCCESS && b->expr1 != NULL
7922 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
7923 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7930 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
7931 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
7936 resolve_branch (b->label1, b);
7940 resolve_block_construct (b);
7944 case EXEC_SELECT_TYPE:
7955 case EXEC_OMP_ATOMIC:
7956 case EXEC_OMP_CRITICAL:
7958 case EXEC_OMP_MASTER:
7959 case EXEC_OMP_ORDERED:
7960 case EXEC_OMP_PARALLEL:
7961 case EXEC_OMP_PARALLEL_DO:
7962 case EXEC_OMP_PARALLEL_SECTIONS:
7963 case EXEC_OMP_PARALLEL_WORKSHARE:
7964 case EXEC_OMP_SECTIONS:
7965 case EXEC_OMP_SINGLE:
7967 case EXEC_OMP_TASKWAIT:
7968 case EXEC_OMP_WORKSHARE:
7972 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
7975 resolve_code (b->next, ns);
7980 /* Does everything to resolve an ordinary assignment. Returns true
7981 if this is an interface assignment. */
7983 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
7993 if (gfc_extend_assign (code, ns) == SUCCESS)
7997 if (code->op == EXEC_ASSIGN_CALL)
7999 lhs = code->ext.actual->expr;
8000 rhsptr = &code->ext.actual->next->expr;
8004 gfc_actual_arglist* args;
8005 gfc_typebound_proc* tbp;
8007 gcc_assert (code->op == EXEC_COMPCALL);
8009 args = code->expr1->value.compcall.actual;
8011 rhsptr = &args->next->expr;
8013 tbp = code->expr1->value.compcall.tbp;
8014 gcc_assert (!tbp->is_generic);
8017 /* Make a temporary rhs when there is a default initializer
8018 and rhs is the same symbol as the lhs. */
8019 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8020 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8021 && has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8022 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8023 *rhsptr = gfc_get_parentheses (*rhsptr);
8032 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8033 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8034 &code->loc) == FAILURE)
8037 /* Handle the case of a BOZ literal on the RHS. */
8038 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8041 if (gfc_option.warn_surprising)
8042 gfc_warning ("BOZ literal at %L is bitwise transferred "
8043 "non-integer symbol '%s'", &code->loc,
8044 lhs->symtree->n.sym->name);
8046 if (!gfc_convert_boz (rhs, &lhs->ts))
8048 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8050 if (rc == ARITH_UNDERFLOW)
8051 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8052 ". This check can be disabled with the option "
8053 "-fno-range-check", &rhs->where);
8054 else if (rc == ARITH_OVERFLOW)
8055 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8056 ". This check can be disabled with the option "
8057 "-fno-range-check", &rhs->where);
8058 else if (rc == ARITH_NAN)
8059 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8060 ". This check can be disabled with the option "
8061 "-fno-range-check", &rhs->where);
8067 if (lhs->ts.type == BT_CHARACTER
8068 && gfc_option.warn_character_truncation)
8070 if (lhs->ts.u.cl != NULL
8071 && lhs->ts.u.cl->length != NULL
8072 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8073 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8075 if (rhs->expr_type == EXPR_CONSTANT)
8076 rlen = rhs->value.character.length;
8078 else if (rhs->ts.u.cl != NULL
8079 && rhs->ts.u.cl->length != NULL
8080 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8081 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8083 if (rlen && llen && rlen > llen)
8084 gfc_warning_now ("CHARACTER expression will be truncated "
8085 "in assignment (%d/%d) at %L",
8086 llen, rlen, &code->loc);
8089 /* Ensure that a vector index expression for the lvalue is evaluated
8090 to a temporary if the lvalue symbol is referenced in it. */
8093 for (ref = lhs->ref; ref; ref= ref->next)
8094 if (ref->type == REF_ARRAY)
8096 for (n = 0; n < ref->u.ar.dimen; n++)
8097 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8098 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8099 ref->u.ar.start[n]))
8101 = gfc_get_parentheses (ref->u.ar.start[n]);
8105 if (gfc_pure (NULL))
8107 if (gfc_impure_variable (lhs->symtree->n.sym))
8109 gfc_error ("Cannot assign to variable '%s' in PURE "
8111 lhs->symtree->n.sym->name,
8116 if (lhs->ts.type == BT_DERIVED
8117 && lhs->expr_type == EXPR_VARIABLE
8118 && lhs->ts.u.derived->attr.pointer_comp
8119 && rhs->expr_type == EXPR_VARIABLE
8120 && (gfc_impure_variable (rhs->symtree->n.sym)
8121 || gfc_is_coindexed (rhs)))
8124 if (gfc_is_coindexed (rhs))
8125 gfc_error ("Coindexed expression at %L is assigned to "
8126 "a derived type variable with a POINTER "
8127 "component in a PURE procedure",
8130 gfc_error ("The impure variable at %L is assigned to "
8131 "a derived type variable with a POINTER "
8132 "component in a PURE procedure (12.6)",
8137 /* Fortran 2008, C1283. */
8138 if (gfc_is_coindexed (lhs))
8140 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8141 "procedure", &rhs->where);
8147 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
8148 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
8149 if (lhs->ts.type == BT_CLASS)
8151 gfc_error ("Variable must not be polymorphic in assignment at %L",
8156 /* F2008, Section 7.2.1.2. */
8157 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
8159 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
8160 "component in assignment at %L", &lhs->where);
8164 gfc_check_assign (lhs, rhs, 1);
8169 /* Given a block of code, recursively resolve everything pointed to by this
8173 resolve_code (gfc_code *code, gfc_namespace *ns)
8175 int omp_workshare_save;
8180 frame.prev = cs_base;
8184 find_reachable_labels (code);
8186 for (; code; code = code->next)
8188 frame.current = code;
8189 forall_save = forall_flag;
8191 if (code->op == EXEC_FORALL)
8194 gfc_resolve_forall (code, ns, forall_save);
8197 else if (code->block)
8199 omp_workshare_save = -1;
8202 case EXEC_OMP_PARALLEL_WORKSHARE:
8203 omp_workshare_save = omp_workshare_flag;
8204 omp_workshare_flag = 1;
8205 gfc_resolve_omp_parallel_blocks (code, ns);
8207 case EXEC_OMP_PARALLEL:
8208 case EXEC_OMP_PARALLEL_DO:
8209 case EXEC_OMP_PARALLEL_SECTIONS:
8211 omp_workshare_save = omp_workshare_flag;
8212 omp_workshare_flag = 0;
8213 gfc_resolve_omp_parallel_blocks (code, ns);
8216 gfc_resolve_omp_do_blocks (code, ns);
8218 case EXEC_SELECT_TYPE:
8219 gfc_current_ns = code->ext.ns;
8220 gfc_resolve_blocks (code->block, gfc_current_ns);
8221 gfc_current_ns = ns;
8223 case EXEC_OMP_WORKSHARE:
8224 omp_workshare_save = omp_workshare_flag;
8225 omp_workshare_flag = 1;
8228 gfc_resolve_blocks (code->block, ns);
8232 if (omp_workshare_save != -1)
8233 omp_workshare_flag = omp_workshare_save;
8237 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
8238 t = gfc_resolve_expr (code->expr1);
8239 forall_flag = forall_save;
8241 if (gfc_resolve_expr (code->expr2) == FAILURE)
8244 if (code->op == EXEC_ALLOCATE
8245 && gfc_resolve_expr (code->expr3) == FAILURE)
8251 case EXEC_END_BLOCK:
8255 case EXEC_ERROR_STOP:
8259 case EXEC_ASSIGN_CALL:
8264 case EXEC_SYNC_IMAGES:
8265 case EXEC_SYNC_MEMORY:
8266 resolve_sync (code);
8270 /* Keep track of which entry we are up to. */
8271 current_entry_id = code->ext.entry->id;
8275 resolve_where (code, NULL);
8279 if (code->expr1 != NULL)
8281 if (code->expr1->ts.type != BT_INTEGER)
8282 gfc_error ("ASSIGNED GOTO statement at %L requires an "
8283 "INTEGER variable", &code->expr1->where);
8284 else if (code->expr1->symtree->n.sym->attr.assign != 1)
8285 gfc_error ("Variable '%s' has not been assigned a target "
8286 "label at %L", code->expr1->symtree->n.sym->name,
8287 &code->expr1->where);
8290 resolve_branch (code->label1, code);
8294 if (code->expr1 != NULL
8295 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
8296 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
8297 "INTEGER return specifier", &code->expr1->where);
8300 case EXEC_INIT_ASSIGN:
8301 case EXEC_END_PROCEDURE:
8308 if (resolve_ordinary_assign (code, ns))
8310 if (code->op == EXEC_COMPCALL)
8317 case EXEC_LABEL_ASSIGN:
8318 if (code->label1->defined == ST_LABEL_UNKNOWN)
8319 gfc_error ("Label %d referenced at %L is never defined",
8320 code->label1->value, &code->label1->where);
8322 && (code->expr1->expr_type != EXPR_VARIABLE
8323 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
8324 || code->expr1->symtree->n.sym->ts.kind
8325 != gfc_default_integer_kind
8326 || code->expr1->symtree->n.sym->as != NULL))
8327 gfc_error ("ASSIGN statement at %L requires a scalar "
8328 "default INTEGER variable", &code->expr1->where);
8331 case EXEC_POINTER_ASSIGN:
8335 gfc_check_pointer_assign (code->expr1, code->expr2);
8338 case EXEC_ARITHMETIC_IF:
8340 && code->expr1->ts.type != BT_INTEGER
8341 && code->expr1->ts.type != BT_REAL)
8342 gfc_error ("Arithmetic IF statement at %L requires a numeric "
8343 "expression", &code->expr1->where);
8345 resolve_branch (code->label1, code);
8346 resolve_branch (code->label2, code);
8347 resolve_branch (code->label3, code);
8351 if (t == SUCCESS && code->expr1 != NULL
8352 && (code->expr1->ts.type != BT_LOGICAL
8353 || code->expr1->rank != 0))
8354 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8355 &code->expr1->where);
8360 resolve_call (code);
8365 resolve_typebound_subroutine (code);
8369 resolve_ppc_call (code);
8373 /* Select is complicated. Also, a SELECT construct could be
8374 a transformed computed GOTO. */
8375 resolve_select (code);
8378 case EXEC_SELECT_TYPE:
8379 resolve_select_type (code);
8383 gfc_resolve (code->ext.ns);
8387 if (code->ext.iterator != NULL)
8389 gfc_iterator *iter = code->ext.iterator;
8390 if (gfc_resolve_iterator (iter, true) != FAILURE)
8391 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
8396 if (code->expr1 == NULL)
8397 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
8399 && (code->expr1->rank != 0
8400 || code->expr1->ts.type != BT_LOGICAL))
8401 gfc_error ("Exit condition of DO WHILE loop at %L must be "
8402 "a scalar LOGICAL expression", &code->expr1->where);
8407 resolve_allocate_deallocate (code, "ALLOCATE");
8411 case EXEC_DEALLOCATE:
8413 resolve_allocate_deallocate (code, "DEALLOCATE");
8418 if (gfc_resolve_open (code->ext.open) == FAILURE)
8421 resolve_branch (code->ext.open->err, code);
8425 if (gfc_resolve_close (code->ext.close) == FAILURE)
8428 resolve_branch (code->ext.close->err, code);
8431 case EXEC_BACKSPACE:
8435 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8438 resolve_branch (code->ext.filepos->err, code);
8442 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8445 resolve_branch (code->ext.inquire->err, code);
8449 gcc_assert (code->ext.inquire != NULL);
8450 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8453 resolve_branch (code->ext.inquire->err, code);
8457 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8460 resolve_branch (code->ext.wait->err, code);
8461 resolve_branch (code->ext.wait->end, code);
8462 resolve_branch (code->ext.wait->eor, code);
8467 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8470 resolve_branch (code->ext.dt->err, code);
8471 resolve_branch (code->ext.dt->end, code);
8472 resolve_branch (code->ext.dt->eor, code);
8476 resolve_transfer (code);
8480 resolve_forall_iterators (code->ext.forall_iterator);
8482 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8483 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8484 "expression", &code->expr1->where);
8487 case EXEC_OMP_ATOMIC:
8488 case EXEC_OMP_BARRIER:
8489 case EXEC_OMP_CRITICAL:
8490 case EXEC_OMP_FLUSH:
8492 case EXEC_OMP_MASTER:
8493 case EXEC_OMP_ORDERED:
8494 case EXEC_OMP_SECTIONS:
8495 case EXEC_OMP_SINGLE:
8496 case EXEC_OMP_TASKWAIT:
8497 case EXEC_OMP_WORKSHARE:
8498 gfc_resolve_omp_directive (code, ns);
8501 case EXEC_OMP_PARALLEL:
8502 case EXEC_OMP_PARALLEL_DO:
8503 case EXEC_OMP_PARALLEL_SECTIONS:
8504 case EXEC_OMP_PARALLEL_WORKSHARE:
8506 omp_workshare_save = omp_workshare_flag;
8507 omp_workshare_flag = 0;
8508 gfc_resolve_omp_directive (code, ns);
8509 omp_workshare_flag = omp_workshare_save;
8513 gfc_internal_error ("resolve_code(): Bad statement code");
8517 cs_base = frame.prev;
8521 /* Resolve initial values and make sure they are compatible with
8525 resolve_values (gfc_symbol *sym)
8527 if (sym->value == NULL)
8530 if (gfc_resolve_expr (sym->value) == FAILURE)
8533 gfc_check_assign_symbol (sym, sym->value);
8537 /* Verify the binding labels for common blocks that are BIND(C). The label
8538 for a BIND(C) common block must be identical in all scoping units in which
8539 the common block is declared. Further, the binding label can not collide
8540 with any other global entity in the program. */
8543 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8545 if (comm_block_tree->n.common->is_bind_c == 1)
8547 gfc_gsymbol *binding_label_gsym;
8548 gfc_gsymbol *comm_name_gsym;
8550 /* See if a global symbol exists by the common block's name. It may
8551 be NULL if the common block is use-associated. */
8552 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8553 comm_block_tree->n.common->name);
8554 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8555 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8556 "with the global entity '%s' at %L",
8557 comm_block_tree->n.common->binding_label,
8558 comm_block_tree->n.common->name,
8559 &(comm_block_tree->n.common->where),
8560 comm_name_gsym->name, &(comm_name_gsym->where));
8561 else if (comm_name_gsym != NULL
8562 && strcmp (comm_name_gsym->name,
8563 comm_block_tree->n.common->name) == 0)
8565 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8567 if (comm_name_gsym->binding_label == NULL)
8568 /* No binding label for common block stored yet; save this one. */
8569 comm_name_gsym->binding_label =
8570 comm_block_tree->n.common->binding_label;
8572 if (strcmp (comm_name_gsym->binding_label,
8573 comm_block_tree->n.common->binding_label) != 0)
8575 /* Common block names match but binding labels do not. */
8576 gfc_error ("Binding label '%s' for common block '%s' at %L "
8577 "does not match the binding label '%s' for common "
8579 comm_block_tree->n.common->binding_label,
8580 comm_block_tree->n.common->name,
8581 &(comm_block_tree->n.common->where),
8582 comm_name_gsym->binding_label,
8583 comm_name_gsym->name,
8584 &(comm_name_gsym->where));
8589 /* There is no binding label (NAME="") so we have nothing further to
8590 check and nothing to add as a global symbol for the label. */
8591 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8594 binding_label_gsym =
8595 gfc_find_gsymbol (gfc_gsym_root,
8596 comm_block_tree->n.common->binding_label);
8597 if (binding_label_gsym == NULL)
8599 /* Need to make a global symbol for the binding label to prevent
8600 it from colliding with another. */
8601 binding_label_gsym =
8602 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8603 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8604 binding_label_gsym->type = GSYM_COMMON;
8608 /* If comm_name_gsym is NULL, the name common block is use
8609 associated and the name could be colliding. */
8610 if (binding_label_gsym->type != GSYM_COMMON)
8611 gfc_error ("Binding label '%s' for common block '%s' at %L "
8612 "collides with the global entity '%s' at %L",
8613 comm_block_tree->n.common->binding_label,
8614 comm_block_tree->n.common->name,
8615 &(comm_block_tree->n.common->where),
8616 binding_label_gsym->name,
8617 &(binding_label_gsym->where));
8618 else if (comm_name_gsym != NULL
8619 && (strcmp (binding_label_gsym->name,
8620 comm_name_gsym->binding_label) != 0)
8621 && (strcmp (binding_label_gsym->sym_name,
8622 comm_name_gsym->name) != 0))
8623 gfc_error ("Binding label '%s' for common block '%s' at %L "
8624 "collides with global entity '%s' at %L",
8625 binding_label_gsym->name, binding_label_gsym->sym_name,
8626 &(comm_block_tree->n.common->where),
8627 comm_name_gsym->name, &(comm_name_gsym->where));
8635 /* Verify any BIND(C) derived types in the namespace so we can report errors
8636 for them once, rather than for each variable declared of that type. */
8639 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8641 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8642 && derived_sym->attr.is_bind_c == 1)
8643 verify_bind_c_derived_type (derived_sym);
8649 /* Verify that any binding labels used in a given namespace do not collide
8650 with the names or binding labels of any global symbols. */
8653 gfc_verify_binding_labels (gfc_symbol *sym)
8657 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8658 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8660 gfc_gsymbol *bind_c_sym;
8662 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8663 if (bind_c_sym != NULL
8664 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8666 if (sym->attr.if_source == IFSRC_DECL
8667 && (bind_c_sym->type != GSYM_SUBROUTINE
8668 && bind_c_sym->type != GSYM_FUNCTION)
8669 && ((sym->attr.contained == 1
8670 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8671 || (sym->attr.use_assoc == 1
8672 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8674 /* Make sure global procedures don't collide with anything. */
8675 gfc_error ("Binding label '%s' at %L collides with the global "
8676 "entity '%s' at %L", sym->binding_label,
8677 &(sym->declared_at), bind_c_sym->name,
8678 &(bind_c_sym->where));
8681 else if (sym->attr.contained == 0
8682 && (sym->attr.if_source == IFSRC_IFBODY
8683 && sym->attr.flavor == FL_PROCEDURE)
8684 && (bind_c_sym->sym_name != NULL
8685 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8687 /* Make sure procedures in interface bodies don't collide. */
8688 gfc_error ("Binding label '%s' in interface body at %L collides "
8689 "with the global entity '%s' at %L",
8691 &(sym->declared_at), bind_c_sym->name,
8692 &(bind_c_sym->where));
8695 else if (sym->attr.contained == 0
8696 && sym->attr.if_source == IFSRC_UNKNOWN)
8697 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8698 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8699 || sym->attr.use_assoc == 0)
8701 gfc_error ("Binding label '%s' at %L collides with global "
8702 "entity '%s' at %L", sym->binding_label,
8703 &(sym->declared_at), bind_c_sym->name,
8704 &(bind_c_sym->where));
8709 /* Clear the binding label to prevent checking multiple times. */
8710 sym->binding_label[0] = '\0';
8712 else if (bind_c_sym == NULL)
8714 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8715 bind_c_sym->where = sym->declared_at;
8716 bind_c_sym->sym_name = sym->name;
8718 if (sym->attr.use_assoc == 1)
8719 bind_c_sym->mod_name = sym->module;
8721 if (sym->ns->proc_name != NULL)
8722 bind_c_sym->mod_name = sym->ns->proc_name->name;
8724 if (sym->attr.contained == 0)
8726 if (sym->attr.subroutine)
8727 bind_c_sym->type = GSYM_SUBROUTINE;
8728 else if (sym->attr.function)
8729 bind_c_sym->type = GSYM_FUNCTION;
8737 /* Resolve an index expression. */
8740 resolve_index_expr (gfc_expr *e)
8742 if (gfc_resolve_expr (e) == FAILURE)
8745 if (gfc_simplify_expr (e, 0) == FAILURE)
8748 if (gfc_specification_expr (e) == FAILURE)
8754 /* Resolve a charlen structure. */
8757 resolve_charlen (gfc_charlen *cl)
8766 specification_expr = 1;
8768 if (resolve_index_expr (cl->length) == FAILURE)
8770 specification_expr = 0;
8774 /* "If the character length parameter value evaluates to a negative
8775 value, the length of character entities declared is zero." */
8776 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8778 if (gfc_option.warn_surprising)
8779 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
8780 " the length has been set to zero",
8781 &cl->length->where, i);
8782 gfc_replace_expr (cl->length,
8783 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
8786 /* Check that the character length is not too large. */
8787 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8788 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8789 && cl->length->ts.type == BT_INTEGER
8790 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8792 gfc_error ("String length at %L is too large", &cl->length->where);
8800 /* Test for non-constant shape arrays. */
8803 is_non_constant_shape_array (gfc_symbol *sym)
8809 not_constant = false;
8810 if (sym->as != NULL)
8812 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
8813 has not been simplified; parameter array references. Do the
8814 simplification now. */
8815 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
8817 e = sym->as->lower[i];
8818 if (e && (resolve_index_expr (e) == FAILURE
8819 || !gfc_is_constant_expr (e)))
8820 not_constant = true;
8821 e = sym->as->upper[i];
8822 if (e && (resolve_index_expr (e) == FAILURE
8823 || !gfc_is_constant_expr (e)))
8824 not_constant = true;
8827 return not_constant;
8830 /* Given a symbol and an initialization expression, add code to initialize
8831 the symbol to the function entry. */
8833 build_init_assign (gfc_symbol *sym, gfc_expr *init)
8837 gfc_namespace *ns = sym->ns;
8839 /* Search for the function namespace if this is a contained
8840 function without an explicit result. */
8841 if (sym->attr.function && sym == sym->result
8842 && sym->name != sym->ns->proc_name->name)
8845 for (;ns; ns = ns->sibling)
8846 if (strcmp (ns->proc_name->name, sym->name) == 0)
8852 gfc_free_expr (init);
8856 /* Build an l-value expression for the result. */
8857 lval = gfc_lval_expr_from_sym (sym);
8859 /* Add the code at scope entry. */
8860 init_st = gfc_get_code ();
8861 init_st->next = ns->code;
8864 /* Assign the default initializer to the l-value. */
8865 init_st->loc = sym->declared_at;
8866 init_st->op = EXEC_INIT_ASSIGN;
8867 init_st->expr1 = lval;
8868 init_st->expr2 = init;
8871 /* Assign the default initializer to a derived type variable or result. */
8874 apply_default_init (gfc_symbol *sym)
8876 gfc_expr *init = NULL;
8878 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8881 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
8882 init = gfc_default_initializer (&sym->ts);
8887 build_init_assign (sym, init);
8890 /* Build an initializer for a local integer, real, complex, logical, or
8891 character variable, based on the command line flags finit-local-zero,
8892 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
8893 null if the symbol should not have a default initialization. */
8895 build_default_init_expr (gfc_symbol *sym)
8898 gfc_expr *init_expr;
8901 /* These symbols should never have a default initialization. */
8902 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
8903 || sym->attr.external
8905 || sym->attr.pointer
8906 || sym->attr.in_equivalence
8907 || sym->attr.in_common
8910 || sym->attr.cray_pointee
8911 || sym->attr.cray_pointer)
8914 /* Now we'll try to build an initializer expression. */
8915 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
8918 /* We will only initialize integers, reals, complex, logicals, and
8919 characters, and only if the corresponding command-line flags
8920 were set. Otherwise, we free init_expr and return null. */
8921 switch (sym->ts.type)
8924 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
8925 mpz_init_set_si (init_expr->value.integer,
8926 gfc_option.flag_init_integer_value);
8929 gfc_free_expr (init_expr);
8935 mpfr_init (init_expr->value.real);
8936 switch (gfc_option.flag_init_real)
8938 case GFC_INIT_REAL_SNAN:
8939 init_expr->is_snan = 1;
8941 case GFC_INIT_REAL_NAN:
8942 mpfr_set_nan (init_expr->value.real);
8945 case GFC_INIT_REAL_INF:
8946 mpfr_set_inf (init_expr->value.real, 1);
8949 case GFC_INIT_REAL_NEG_INF:
8950 mpfr_set_inf (init_expr->value.real, -1);
8953 case GFC_INIT_REAL_ZERO:
8954 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
8958 gfc_free_expr (init_expr);
8965 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
8966 switch (gfc_option.flag_init_real)
8968 case GFC_INIT_REAL_SNAN:
8969 init_expr->is_snan = 1;
8971 case GFC_INIT_REAL_NAN:
8972 mpfr_set_nan (mpc_realref (init_expr->value.complex));
8973 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
8976 case GFC_INIT_REAL_INF:
8977 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
8978 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
8981 case GFC_INIT_REAL_NEG_INF:
8982 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
8983 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
8986 case GFC_INIT_REAL_ZERO:
8987 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
8991 gfc_free_expr (init_expr);
8998 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
8999 init_expr->value.logical = 0;
9000 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9001 init_expr->value.logical = 1;
9004 gfc_free_expr (init_expr);
9010 /* For characters, the length must be constant in order to
9011 create a default initializer. */
9012 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9013 && sym->ts.u.cl->length
9014 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9016 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9017 init_expr->value.character.length = char_len;
9018 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9019 for (i = 0; i < char_len; i++)
9020 init_expr->value.character.string[i]
9021 = (unsigned char) gfc_option.flag_init_character_value;
9025 gfc_free_expr (init_expr);
9031 gfc_free_expr (init_expr);
9037 /* Add an initialization expression to a local variable. */
9039 apply_default_init_local (gfc_symbol *sym)
9041 gfc_expr *init = NULL;
9043 /* The symbol should be a variable or a function return value. */
9044 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9045 || (sym->attr.function && sym->result != sym))
9048 /* Try to build the initializer expression. If we can't initialize
9049 this symbol, then init will be NULL. */
9050 init = build_default_init_expr (sym);
9054 /* For saved variables, we don't want to add an initializer at
9055 function entry, so we just add a static initializer. */
9056 if (sym->attr.save || sym->ns->save_all
9057 || gfc_option.flag_max_stack_var_size == 0)
9059 /* Don't clobber an existing initializer! */
9060 gcc_assert (sym->value == NULL);
9065 build_init_assign (sym, init);
9068 /* Resolution of common features of flavors variable and procedure. */
9071 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9073 /* Constraints on deferred shape variable. */
9074 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9076 if (sym->attr.allocatable)
9078 if (sym->attr.dimension)
9080 gfc_error ("Allocatable array '%s' at %L must have "
9081 "a deferred shape", sym->name, &sym->declared_at);
9084 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9085 "may not be ALLOCATABLE", sym->name,
9086 &sym->declared_at) == FAILURE)
9090 if (sym->attr.pointer && sym->attr.dimension)
9092 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
9093 sym->name, &sym->declared_at);
9100 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
9101 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
9103 gfc_error ("Array '%s' at %L cannot have a deferred shape",
9104 sym->name, &sym->declared_at);
9112 /* Additional checks for symbols with flavor variable and derived
9113 type. To be called from resolve_fl_variable. */
9116 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
9118 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
9120 /* Check to see if a derived type is blocked from being host
9121 associated by the presence of another class I symbol in the same
9122 namespace. 14.6.1.3 of the standard and the discussion on
9123 comp.lang.fortran. */
9124 if (sym->ns != sym->ts.u.derived->ns
9125 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
9128 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
9129 if (s && s->attr.flavor != FL_DERIVED)
9131 gfc_error ("The type '%s' cannot be host associated at %L "
9132 "because it is blocked by an incompatible object "
9133 "of the same name declared at %L",
9134 sym->ts.u.derived->name, &sym->declared_at,
9140 /* 4th constraint in section 11.3: "If an object of a type for which
9141 component-initialization is specified (R429) appears in the
9142 specification-part of a module and does not have the ALLOCATABLE
9143 or POINTER attribute, the object shall have the SAVE attribute."
9145 The check for initializers is performed with
9146 has_default_initializer because gfc_default_initializer generates
9147 a hidden default for allocatable components. */
9148 if (!(sym->value || no_init_flag) && sym->ns->proc_name
9149 && sym->ns->proc_name->attr.flavor == FL_MODULE
9150 && !sym->ns->save_all && !sym->attr.save
9151 && !sym->attr.pointer && !sym->attr.allocatable
9152 && has_default_initializer (sym->ts.u.derived)
9153 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
9154 "module variable '%s' at %L, needed due to "
9155 "the default initialization", sym->name,
9156 &sym->declared_at) == FAILURE)
9159 if (sym->ts.type == BT_CLASS)
9162 if (!gfc_type_is_extensible (sym->ts.u.derived->components->ts.u.derived))
9164 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
9165 sym->ts.u.derived->components->ts.u.derived->name,
9166 sym->name, &sym->declared_at);
9171 /* Assume that use associated symbols were checked in the module ns. */
9172 if (!sym->attr.class_ok && !sym->attr.use_assoc)
9174 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
9175 "or pointer", sym->name, &sym->declared_at);
9180 /* Assign default initializer. */
9181 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
9182 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
9184 sym->value = gfc_default_initializer (&sym->ts);
9191 /* Resolve symbols with flavor variable. */
9194 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
9196 int no_init_flag, automatic_flag;
9198 const char *auto_save_msg;
9200 auto_save_msg = "Automatic object '%s' at %L cannot have the "
9203 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9206 /* Set this flag to check that variables are parameters of all entries.
9207 This check is effected by the call to gfc_resolve_expr through
9208 is_non_constant_shape_array. */
9209 specification_expr = 1;
9211 if (sym->ns->proc_name
9212 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9213 || sym->ns->proc_name->attr.is_main_program)
9214 && !sym->attr.use_assoc
9215 && !sym->attr.allocatable
9216 && !sym->attr.pointer
9217 && is_non_constant_shape_array (sym))
9219 /* The shape of a main program or module array needs to be
9221 gfc_error ("The module or main program array '%s' at %L must "
9222 "have constant shape", sym->name, &sym->declared_at);
9223 specification_expr = 0;
9227 if (sym->ts.type == BT_CHARACTER)
9229 /* Make sure that character string variables with assumed length are
9231 e = sym->ts.u.cl->length;
9232 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
9234 gfc_error ("Entity with assumed character length at %L must be a "
9235 "dummy argument or a PARAMETER", &sym->declared_at);
9239 if (e && sym->attr.save && !gfc_is_constant_expr (e))
9241 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9245 if (!gfc_is_constant_expr (e)
9246 && !(e->expr_type == EXPR_VARIABLE
9247 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
9248 && sym->ns->proc_name
9249 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9250 || sym->ns->proc_name->attr.is_main_program)
9251 && !sym->attr.use_assoc)
9253 gfc_error ("'%s' at %L must have constant character length "
9254 "in this context", sym->name, &sym->declared_at);
9259 if (sym->value == NULL && sym->attr.referenced)
9260 apply_default_init_local (sym); /* Try to apply a default initialization. */
9262 /* Determine if the symbol may not have an initializer. */
9263 no_init_flag = automatic_flag = 0;
9264 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
9265 || sym->attr.intrinsic || sym->attr.result)
9267 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
9268 && is_non_constant_shape_array (sym))
9270 no_init_flag = automatic_flag = 1;
9272 /* Also, they must not have the SAVE attribute.
9273 SAVE_IMPLICIT is checked below. */
9274 if (sym->attr.save == SAVE_EXPLICIT)
9276 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9281 /* Ensure that any initializer is simplified. */
9283 gfc_simplify_expr (sym->value, 1);
9285 /* Reject illegal initializers. */
9286 if (!sym->mark && sym->value)
9288 if (sym->attr.allocatable)
9289 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
9290 sym->name, &sym->declared_at);
9291 else if (sym->attr.external)
9292 gfc_error ("External '%s' at %L cannot have an initializer",
9293 sym->name, &sym->declared_at);
9294 else if (sym->attr.dummy
9295 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
9296 gfc_error ("Dummy '%s' at %L cannot have an initializer",
9297 sym->name, &sym->declared_at);
9298 else if (sym->attr.intrinsic)
9299 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
9300 sym->name, &sym->declared_at);
9301 else if (sym->attr.result)
9302 gfc_error ("Function result '%s' at %L cannot have an initializer",
9303 sym->name, &sym->declared_at);
9304 else if (automatic_flag)
9305 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
9306 sym->name, &sym->declared_at);
9313 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
9314 return resolve_fl_variable_derived (sym, no_init_flag);
9320 /* Resolve a procedure. */
9323 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
9325 gfc_formal_arglist *arg;
9327 if (sym->attr.function
9328 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9331 if (sym->ts.type == BT_CHARACTER)
9333 gfc_charlen *cl = sym->ts.u.cl;
9335 if (cl && cl->length && gfc_is_constant_expr (cl->length)
9336 && resolve_charlen (cl) == FAILURE)
9339 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9340 && sym->attr.proc == PROC_ST_FUNCTION)
9342 gfc_error ("Character-valued statement function '%s' at %L must "
9343 "have constant length", sym->name, &sym->declared_at);
9348 /* Ensure that derived type for are not of a private type. Internal
9349 module procedures are excluded by 2.2.3.3 - i.e., they are not
9350 externally accessible and can access all the objects accessible in
9352 if (!(sym->ns->parent
9353 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
9354 && gfc_check_access(sym->attr.access, sym->ns->default_access))
9356 gfc_interface *iface;
9358 for (arg = sym->formal; arg; arg = arg->next)
9361 && arg->sym->ts.type == BT_DERIVED
9362 && !arg->sym->ts.u.derived->attr.use_assoc
9363 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9364 arg->sym->ts.u.derived->ns->default_access)
9365 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
9366 "PRIVATE type and cannot be a dummy argument"
9367 " of '%s', which is PUBLIC at %L",
9368 arg->sym->name, sym->name, &sym->declared_at)
9371 /* Stop this message from recurring. */
9372 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9377 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9378 PRIVATE to the containing module. */
9379 for (iface = sym->generic; iface; iface = iface->next)
9381 for (arg = iface->sym->formal; arg; arg = arg->next)
9384 && arg->sym->ts.type == BT_DERIVED
9385 && !arg->sym->ts.u.derived->attr.use_assoc
9386 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9387 arg->sym->ts.u.derived->ns->default_access)
9388 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9389 "'%s' in PUBLIC interface '%s' at %L "
9390 "takes dummy arguments of '%s' which is "
9391 "PRIVATE", iface->sym->name, sym->name,
9392 &iface->sym->declared_at,
9393 gfc_typename (&arg->sym->ts)) == FAILURE)
9395 /* Stop this message from recurring. */
9396 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9402 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9403 PRIVATE to the containing module. */
9404 for (iface = sym->generic; iface; iface = iface->next)
9406 for (arg = iface->sym->formal; arg; arg = arg->next)
9409 && arg->sym->ts.type == BT_DERIVED
9410 && !arg->sym->ts.u.derived->attr.use_assoc
9411 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9412 arg->sym->ts.u.derived->ns->default_access)
9413 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9414 "'%s' in PUBLIC interface '%s' at %L "
9415 "takes dummy arguments of '%s' which is "
9416 "PRIVATE", iface->sym->name, sym->name,
9417 &iface->sym->declared_at,
9418 gfc_typename (&arg->sym->ts)) == FAILURE)
9420 /* Stop this message from recurring. */
9421 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9428 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9429 && !sym->attr.proc_pointer)
9431 gfc_error ("Function '%s' at %L cannot have an initializer",
9432 sym->name, &sym->declared_at);
9436 /* An external symbol may not have an initializer because it is taken to be
9437 a procedure. Exception: Procedure Pointers. */
9438 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9440 gfc_error ("External object '%s' at %L may not have an initializer",
9441 sym->name, &sym->declared_at);
9445 /* An elemental function is required to return a scalar 12.7.1 */
9446 if (sym->attr.elemental && sym->attr.function && sym->as)
9448 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9449 "result", sym->name, &sym->declared_at);
9450 /* Reset so that the error only occurs once. */
9451 sym->attr.elemental = 0;
9455 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9456 char-len-param shall not be array-valued, pointer-valued, recursive
9457 or pure. ....snip... A character value of * may only be used in the
9458 following ways: (i) Dummy arg of procedure - dummy associates with
9459 actual length; (ii) To declare a named constant; or (iii) External
9460 function - but length must be declared in calling scoping unit. */
9461 if (sym->attr.function
9462 && sym->ts.type == BT_CHARACTER
9463 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9465 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9466 || (sym->attr.recursive) || (sym->attr.pure))
9468 if (sym->as && sym->as->rank)
9469 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9470 "array-valued", sym->name, &sym->declared_at);
9472 if (sym->attr.pointer)
9473 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9474 "pointer-valued", sym->name, &sym->declared_at);
9477 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9478 "pure", sym->name, &sym->declared_at);
9480 if (sym->attr.recursive)
9481 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9482 "recursive", sym->name, &sym->declared_at);
9487 /* Appendix B.2 of the standard. Contained functions give an
9488 error anyway. Fixed-form is likely to be F77/legacy. */
9489 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9490 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9491 "CHARACTER(*) function '%s' at %L",
9492 sym->name, &sym->declared_at);
9495 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9497 gfc_formal_arglist *curr_arg;
9498 int has_non_interop_arg = 0;
9500 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9501 sym->common_block) == FAILURE)
9503 /* Clear these to prevent looking at them again if there was an
9505 sym->attr.is_bind_c = 0;
9506 sym->attr.is_c_interop = 0;
9507 sym->ts.is_c_interop = 0;
9511 /* So far, no errors have been found. */
9512 sym->attr.is_c_interop = 1;
9513 sym->ts.is_c_interop = 1;
9516 curr_arg = sym->formal;
9517 while (curr_arg != NULL)
9519 /* Skip implicitly typed dummy args here. */
9520 if (curr_arg->sym->attr.implicit_type == 0)
9521 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9522 /* If something is found to fail, record the fact so we
9523 can mark the symbol for the procedure as not being
9524 BIND(C) to try and prevent multiple errors being
9526 has_non_interop_arg = 1;
9528 curr_arg = curr_arg->next;
9531 /* See if any of the arguments were not interoperable and if so, clear
9532 the procedure symbol to prevent duplicate error messages. */
9533 if (has_non_interop_arg != 0)
9535 sym->attr.is_c_interop = 0;
9536 sym->ts.is_c_interop = 0;
9537 sym->attr.is_bind_c = 0;
9541 if (!sym->attr.proc_pointer)
9543 if (sym->attr.save == SAVE_EXPLICIT)
9545 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9546 "in '%s' at %L", sym->name, &sym->declared_at);
9549 if (sym->attr.intent)
9551 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9552 "in '%s' at %L", sym->name, &sym->declared_at);
9555 if (sym->attr.subroutine && sym->attr.result)
9557 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9558 "in '%s' at %L", sym->name, &sym->declared_at);
9561 if (sym->attr.external && sym->attr.function
9562 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9563 || sym->attr.contained))
9565 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9566 "in '%s' at %L", sym->name, &sym->declared_at);
9569 if (strcmp ("ppr@", sym->name) == 0)
9571 gfc_error ("Procedure pointer result '%s' at %L "
9572 "is missing the pointer attribute",
9573 sym->ns->proc_name->name, &sym->declared_at);
9582 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9583 been defined and we now know their defined arguments, check that they fulfill
9584 the requirements of the standard for procedures used as finalizers. */
9587 gfc_resolve_finalizers (gfc_symbol* derived)
9589 gfc_finalizer* list;
9590 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9591 gfc_try result = SUCCESS;
9592 bool seen_scalar = false;
9594 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9597 /* Walk over the list of finalizer-procedures, check them, and if any one
9598 does not fit in with the standard's definition, print an error and remove
9599 it from the list. */
9600 prev_link = &derived->f2k_derived->finalizers;
9601 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9607 /* Skip this finalizer if we already resolved it. */
9608 if (list->proc_tree)
9610 prev_link = &(list->next);
9614 /* Check this exists and is a SUBROUTINE. */
9615 if (!list->proc_sym->attr.subroutine)
9617 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9618 list->proc_sym->name, &list->where);
9622 /* We should have exactly one argument. */
9623 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9625 gfc_error ("FINAL procedure at %L must have exactly one argument",
9629 arg = list->proc_sym->formal->sym;
9631 /* This argument must be of our type. */
9632 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9634 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9635 &arg->declared_at, derived->name);
9639 /* It must neither be a pointer nor allocatable nor optional. */
9640 if (arg->attr.pointer)
9642 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9646 if (arg->attr.allocatable)
9648 gfc_error ("Argument of FINAL procedure at %L must not be"
9649 " ALLOCATABLE", &arg->declared_at);
9652 if (arg->attr.optional)
9654 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9659 /* It must not be INTENT(OUT). */
9660 if (arg->attr.intent == INTENT_OUT)
9662 gfc_error ("Argument of FINAL procedure at %L must not be"
9663 " INTENT(OUT)", &arg->declared_at);
9667 /* Warn if the procedure is non-scalar and not assumed shape. */
9668 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9669 && arg->as->type != AS_ASSUMED_SHAPE)
9670 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9671 " shape argument", &arg->declared_at);
9673 /* Check that it does not match in kind and rank with a FINAL procedure
9674 defined earlier. To really loop over the *earlier* declarations,
9675 we need to walk the tail of the list as new ones were pushed at the
9677 /* TODO: Handle kind parameters once they are implemented. */
9678 my_rank = (arg->as ? arg->as->rank : 0);
9679 for (i = list->next; i; i = i->next)
9681 /* Argument list might be empty; that is an error signalled earlier,
9682 but we nevertheless continued resolving. */
9683 if (i->proc_sym->formal)
9685 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9686 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9687 if (i_rank == my_rank)
9689 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9690 " rank (%d) as '%s'",
9691 list->proc_sym->name, &list->where, my_rank,
9698 /* Is this the/a scalar finalizer procedure? */
9699 if (!arg->as || arg->as->rank == 0)
9702 /* Find the symtree for this procedure. */
9703 gcc_assert (!list->proc_tree);
9704 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9706 prev_link = &list->next;
9709 /* Remove wrong nodes immediately from the list so we don't risk any
9710 troubles in the future when they might fail later expectations. */
9714 *prev_link = list->next;
9715 gfc_free_finalizer (i);
9718 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9719 were nodes in the list, must have been for arrays. It is surely a good
9720 idea to have a scalar version there if there's something to finalize. */
9721 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9722 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9723 " defined at %L, suggest also scalar one",
9724 derived->name, &derived->declared_at);
9726 /* TODO: Remove this error when finalization is finished. */
9727 gfc_error ("Finalization at %L is not yet implemented",
9728 &derived->declared_at);
9734 /* Check that it is ok for the typebound procedure proc to override the
9738 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9741 const gfc_symbol* proc_target;
9742 const gfc_symbol* old_target;
9743 unsigned proc_pass_arg, old_pass_arg, argpos;
9744 gfc_formal_arglist* proc_formal;
9745 gfc_formal_arglist* old_formal;
9747 /* This procedure should only be called for non-GENERIC proc. */
9748 gcc_assert (!proc->n.tb->is_generic);
9750 /* If the overwritten procedure is GENERIC, this is an error. */
9751 if (old->n.tb->is_generic)
9753 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9754 old->name, &proc->n.tb->where);
9758 where = proc->n.tb->where;
9759 proc_target = proc->n.tb->u.specific->n.sym;
9760 old_target = old->n.tb->u.specific->n.sym;
9762 /* Check that overridden binding is not NON_OVERRIDABLE. */
9763 if (old->n.tb->non_overridable)
9765 gfc_error ("'%s' at %L overrides a procedure binding declared"
9766 " NON_OVERRIDABLE", proc->name, &where);
9770 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9771 if (!old->n.tb->deferred && proc->n.tb->deferred)
9773 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9774 " non-DEFERRED binding", proc->name, &where);
9778 /* If the overridden binding is PURE, the overriding must be, too. */
9779 if (old_target->attr.pure && !proc_target->attr.pure)
9781 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9782 proc->name, &where);
9786 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9787 is not, the overriding must not be either. */
9788 if (old_target->attr.elemental && !proc_target->attr.elemental)
9790 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
9791 " ELEMENTAL", proc->name, &where);
9794 if (!old_target->attr.elemental && proc_target->attr.elemental)
9796 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
9797 " be ELEMENTAL, either", proc->name, &where);
9801 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
9803 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
9805 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
9806 " SUBROUTINE", proc->name, &where);
9810 /* If the overridden binding is a FUNCTION, the overriding must also be a
9811 FUNCTION and have the same characteristics. */
9812 if (old_target->attr.function)
9814 if (!proc_target->attr.function)
9816 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
9817 " FUNCTION", proc->name, &where);
9821 /* FIXME: Do more comprehensive checking (including, for instance, the
9822 rank and array-shape). */
9823 gcc_assert (proc_target->result && old_target->result);
9824 if (!gfc_compare_types (&proc_target->result->ts,
9825 &old_target->result->ts))
9827 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
9828 " matching result types", proc->name, &where);
9833 /* If the overridden binding is PUBLIC, the overriding one must not be
9835 if (old->n.tb->access == ACCESS_PUBLIC
9836 && proc->n.tb->access == ACCESS_PRIVATE)
9838 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
9839 " PRIVATE", proc->name, &where);
9843 /* Compare the formal argument lists of both procedures. This is also abused
9844 to find the position of the passed-object dummy arguments of both
9845 bindings as at least the overridden one might not yet be resolved and we
9846 need those positions in the check below. */
9847 proc_pass_arg = old_pass_arg = 0;
9848 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
9850 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
9853 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
9854 proc_formal && old_formal;
9855 proc_formal = proc_formal->next, old_formal = old_formal->next)
9857 if (proc->n.tb->pass_arg
9858 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
9859 proc_pass_arg = argpos;
9860 if (old->n.tb->pass_arg
9861 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
9862 old_pass_arg = argpos;
9864 /* Check that the names correspond. */
9865 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
9867 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
9868 " to match the corresponding argument of the overridden"
9869 " procedure", proc_formal->sym->name, proc->name, &where,
9870 old_formal->sym->name);
9874 /* Check that the types correspond if neither is the passed-object
9876 /* FIXME: Do more comprehensive testing here. */
9877 if (proc_pass_arg != argpos && old_pass_arg != argpos
9878 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
9880 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
9881 "in respect to the overridden procedure",
9882 proc_formal->sym->name, proc->name, &where);
9888 if (proc_formal || old_formal)
9890 gfc_error ("'%s' at %L must have the same number of formal arguments as"
9891 " the overridden procedure", proc->name, &where);
9895 /* If the overridden binding is NOPASS, the overriding one must also be
9897 if (old->n.tb->nopass && !proc->n.tb->nopass)
9899 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
9900 " NOPASS", proc->name, &where);
9904 /* If the overridden binding is PASS(x), the overriding one must also be
9905 PASS and the passed-object dummy arguments must correspond. */
9906 if (!old->n.tb->nopass)
9908 if (proc->n.tb->nopass)
9910 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
9911 " PASS", proc->name, &where);
9915 if (proc_pass_arg != old_pass_arg)
9917 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
9918 " the same position as the passed-object dummy argument of"
9919 " the overridden procedure", proc->name, &where);
9928 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
9931 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
9932 const char* generic_name, locus where)
9937 gcc_assert (t1->specific && t2->specific);
9938 gcc_assert (!t1->specific->is_generic);
9939 gcc_assert (!t2->specific->is_generic);
9941 sym1 = t1->specific->u.specific->n.sym;
9942 sym2 = t2->specific->u.specific->n.sym;
9947 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
9948 if (sym1->attr.subroutine != sym2->attr.subroutine
9949 || sym1->attr.function != sym2->attr.function)
9951 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
9952 " GENERIC '%s' at %L",
9953 sym1->name, sym2->name, generic_name, &where);
9957 /* Compare the interfaces. */
9958 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
9960 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
9961 sym1->name, sym2->name, generic_name, &where);
9969 /* Worker function for resolving a generic procedure binding; this is used to
9970 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
9972 The difference between those cases is finding possible inherited bindings
9973 that are overridden, as one has to look for them in tb_sym_root,
9974 tb_uop_root or tb_op, respectively. Thus the caller must already find
9975 the super-type and set p->overridden correctly. */
9978 resolve_tb_generic_targets (gfc_symbol* super_type,
9979 gfc_typebound_proc* p, const char* name)
9981 gfc_tbp_generic* target;
9982 gfc_symtree* first_target;
9983 gfc_symtree* inherited;
9985 gcc_assert (p && p->is_generic);
9987 /* Try to find the specific bindings for the symtrees in our target-list. */
9988 gcc_assert (p->u.generic);
9989 for (target = p->u.generic; target; target = target->next)
9990 if (!target->specific)
9992 gfc_typebound_proc* overridden_tbp;
9994 const char* target_name;
9996 target_name = target->specific_st->name;
9998 /* Defined for this type directly. */
9999 if (target->specific_st->n.tb)
10001 target->specific = target->specific_st->n.tb;
10002 goto specific_found;
10005 /* Look for an inherited specific binding. */
10008 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10013 gcc_assert (inherited->n.tb);
10014 target->specific = inherited->n.tb;
10015 goto specific_found;
10019 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10020 " at %L", target_name, name, &p->where);
10023 /* Once we've found the specific binding, check it is not ambiguous with
10024 other specifics already found or inherited for the same GENERIC. */
10026 gcc_assert (target->specific);
10028 /* This must really be a specific binding! */
10029 if (target->specific->is_generic)
10031 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10032 " '%s' is GENERIC, too", name, &p->where, target_name);
10036 /* Check those already resolved on this type directly. */
10037 for (g = p->u.generic; g; g = g->next)
10038 if (g != target && g->specific
10039 && check_generic_tbp_ambiguity (target, g, name, p->where)
10043 /* Check for ambiguity with inherited specific targets. */
10044 for (overridden_tbp = p->overridden; overridden_tbp;
10045 overridden_tbp = overridden_tbp->overridden)
10046 if (overridden_tbp->is_generic)
10048 for (g = overridden_tbp->u.generic; g; g = g->next)
10050 gcc_assert (g->specific);
10051 if (check_generic_tbp_ambiguity (target, g,
10052 name, p->where) == FAILURE)
10058 /* If we attempt to "overwrite" a specific binding, this is an error. */
10059 if (p->overridden && !p->overridden->is_generic)
10061 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10062 " the same name", name, &p->where);
10066 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10067 all must have the same attributes here. */
10068 first_target = p->u.generic->specific->u.specific;
10069 gcc_assert (first_target);
10070 p->subroutine = first_target->n.sym->attr.subroutine;
10071 p->function = first_target->n.sym->attr.function;
10077 /* Resolve a GENERIC procedure binding for a derived type. */
10080 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10082 gfc_symbol* super_type;
10084 /* Find the overridden binding if any. */
10085 st->n.tb->overridden = NULL;
10086 super_type = gfc_get_derived_super_type (derived);
10089 gfc_symtree* overridden;
10090 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10093 if (overridden && overridden->n.tb)
10094 st->n.tb->overridden = overridden->n.tb;
10097 /* Resolve using worker function. */
10098 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10102 /* Retrieve the target-procedure of an operator binding and do some checks in
10103 common for intrinsic and user-defined type-bound operators. */
10106 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10108 gfc_symbol* target_proc;
10110 gcc_assert (target->specific && !target->specific->is_generic);
10111 target_proc = target->specific->u.specific->n.sym;
10112 gcc_assert (target_proc);
10114 /* All operator bindings must have a passed-object dummy argument. */
10115 if (target->specific->nopass)
10117 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10121 return target_proc;
10125 /* Resolve a type-bound intrinsic operator. */
10128 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10129 gfc_typebound_proc* p)
10131 gfc_symbol* super_type;
10132 gfc_tbp_generic* target;
10134 /* If there's already an error here, do nothing (but don't fail again). */
10138 /* Operators should always be GENERIC bindings. */
10139 gcc_assert (p->is_generic);
10141 /* Look for an overridden binding. */
10142 super_type = gfc_get_derived_super_type (derived);
10143 if (super_type && super_type->f2k_derived)
10144 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
10147 p->overridden = NULL;
10149 /* Resolve general GENERIC properties using worker function. */
10150 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
10153 /* Check the targets to be procedures of correct interface. */
10154 for (target = p->u.generic; target; target = target->next)
10156 gfc_symbol* target_proc;
10158 target_proc = get_checked_tb_operator_target (target, p->where);
10162 if (!gfc_check_operator_interface (target_proc, op, p->where))
10174 /* Resolve a type-bound user operator (tree-walker callback). */
10176 static gfc_symbol* resolve_bindings_derived;
10177 static gfc_try resolve_bindings_result;
10179 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
10182 resolve_typebound_user_op (gfc_symtree* stree)
10184 gfc_symbol* super_type;
10185 gfc_tbp_generic* target;
10187 gcc_assert (stree && stree->n.tb);
10189 if (stree->n.tb->error)
10192 /* Operators should always be GENERIC bindings. */
10193 gcc_assert (stree->n.tb->is_generic);
10195 /* Find overridden procedure, if any. */
10196 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10197 if (super_type && super_type->f2k_derived)
10199 gfc_symtree* overridden;
10200 overridden = gfc_find_typebound_user_op (super_type, NULL,
10201 stree->name, true, NULL);
10203 if (overridden && overridden->n.tb)
10204 stree->n.tb->overridden = overridden->n.tb;
10207 stree->n.tb->overridden = NULL;
10209 /* Resolve basically using worker function. */
10210 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10214 /* Check the targets to be functions of correct interface. */
10215 for (target = stree->n.tb->u.generic; target; target = target->next)
10217 gfc_symbol* target_proc;
10219 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10223 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10230 resolve_bindings_result = FAILURE;
10231 stree->n.tb->error = 1;
10235 /* Resolve the type-bound procedures for a derived type. */
10238 resolve_typebound_procedure (gfc_symtree* stree)
10242 gfc_symbol* me_arg;
10243 gfc_symbol* super_type;
10244 gfc_component* comp;
10246 gcc_assert (stree);
10248 /* Undefined specific symbol from GENERIC target definition. */
10252 if (stree->n.tb->error)
10255 /* If this is a GENERIC binding, use that routine. */
10256 if (stree->n.tb->is_generic)
10258 if (resolve_typebound_generic (resolve_bindings_derived, stree)
10264 /* Get the target-procedure to check it. */
10265 gcc_assert (!stree->n.tb->is_generic);
10266 gcc_assert (stree->n.tb->u.specific);
10267 proc = stree->n.tb->u.specific->n.sym;
10268 where = stree->n.tb->where;
10270 /* Default access should already be resolved from the parser. */
10271 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
10273 /* It should be a module procedure or an external procedure with explicit
10274 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
10275 if ((!proc->attr.subroutine && !proc->attr.function)
10276 || (proc->attr.proc != PROC_MODULE
10277 && proc->attr.if_source != IFSRC_IFBODY)
10278 || (proc->attr.abstract && !stree->n.tb->deferred))
10280 gfc_error ("'%s' must be a module procedure or an external procedure with"
10281 " an explicit interface at %L", proc->name, &where);
10284 stree->n.tb->subroutine = proc->attr.subroutine;
10285 stree->n.tb->function = proc->attr.function;
10287 /* Find the super-type of the current derived type. We could do this once and
10288 store in a global if speed is needed, but as long as not I believe this is
10289 more readable and clearer. */
10290 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10292 /* If PASS, resolve and check arguments if not already resolved / loaded
10293 from a .mod file. */
10294 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
10296 if (stree->n.tb->pass_arg)
10298 gfc_formal_arglist* i;
10300 /* If an explicit passing argument name is given, walk the arg-list
10301 and look for it. */
10304 stree->n.tb->pass_arg_num = 1;
10305 for (i = proc->formal; i; i = i->next)
10307 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
10312 ++stree->n.tb->pass_arg_num;
10317 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
10319 proc->name, stree->n.tb->pass_arg, &where,
10320 stree->n.tb->pass_arg);
10326 /* Otherwise, take the first one; there should in fact be at least
10328 stree->n.tb->pass_arg_num = 1;
10331 gfc_error ("Procedure '%s' with PASS at %L must have at"
10332 " least one argument", proc->name, &where);
10335 me_arg = proc->formal->sym;
10338 /* Now check that the argument-type matches and the passed-object
10339 dummy argument is generally fine. */
10341 gcc_assert (me_arg);
10343 if (me_arg->ts.type != BT_CLASS)
10345 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10346 " at %L", proc->name, &where);
10350 if (me_arg->ts.u.derived->components->ts.u.derived
10351 != resolve_bindings_derived)
10353 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10354 " the derived-type '%s'", me_arg->name, proc->name,
10355 me_arg->name, &where, resolve_bindings_derived->name);
10359 gcc_assert (me_arg->ts.type == BT_CLASS);
10360 if (me_arg->ts.u.derived->components->as
10361 && me_arg->ts.u.derived->components->as->rank > 0)
10363 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
10364 " scalar", proc->name, &where);
10367 if (me_arg->ts.u.derived->components->attr.allocatable)
10369 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10370 " be ALLOCATABLE", proc->name, &where);
10373 if (me_arg->ts.u.derived->components->attr.class_pointer)
10375 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10376 " be POINTER", proc->name, &where);
10381 /* If we are extending some type, check that we don't override a procedure
10382 flagged NON_OVERRIDABLE. */
10383 stree->n.tb->overridden = NULL;
10386 gfc_symtree* overridden;
10387 overridden = gfc_find_typebound_proc (super_type, NULL,
10388 stree->name, true, NULL);
10390 if (overridden && overridden->n.tb)
10391 stree->n.tb->overridden = overridden->n.tb;
10393 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
10397 /* See if there's a name collision with a component directly in this type. */
10398 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
10399 if (!strcmp (comp->name, stree->name))
10401 gfc_error ("Procedure '%s' at %L has the same name as a component of"
10403 stree->name, &where, resolve_bindings_derived->name);
10407 /* Try to find a name collision with an inherited component. */
10408 if (super_type && gfc_find_component (super_type, stree->name, true, true))
10410 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
10411 " component of '%s'",
10412 stree->name, &where, resolve_bindings_derived->name);
10416 stree->n.tb->error = 0;
10420 resolve_bindings_result = FAILURE;
10421 stree->n.tb->error = 1;
10425 resolve_typebound_procedures (gfc_symbol* derived)
10429 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10432 resolve_bindings_derived = derived;
10433 resolve_bindings_result = SUCCESS;
10435 if (derived->f2k_derived->tb_sym_root)
10436 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10437 &resolve_typebound_procedure);
10439 if (derived->f2k_derived->tb_uop_root)
10440 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10441 &resolve_typebound_user_op);
10443 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10445 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10446 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10448 resolve_bindings_result = FAILURE;
10451 return resolve_bindings_result;
10455 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10456 to give all identical derived types the same backend_decl. */
10458 add_dt_to_dt_list (gfc_symbol *derived)
10460 gfc_dt_list *dt_list;
10462 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10463 if (derived == dt_list->derived)
10466 if (dt_list == NULL)
10468 dt_list = gfc_get_dt_list ();
10469 dt_list->next = gfc_derived_types;
10470 dt_list->derived = derived;
10471 gfc_derived_types = dt_list;
10476 /* Ensure that a derived-type is really not abstract, meaning that every
10477 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10480 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10485 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10487 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10490 if (st->n.tb && st->n.tb->deferred)
10492 gfc_symtree* overriding;
10493 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10496 gcc_assert (overriding->n.tb);
10497 if (overriding->n.tb->deferred)
10499 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10500 " '%s' is DEFERRED and not overridden",
10501 sub->name, &sub->declared_at, st->name);
10510 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10512 /* The algorithm used here is to recursively travel up the ancestry of sub
10513 and for each ancestor-type, check all bindings. If any of them is
10514 DEFERRED, look it up starting from sub and see if the found (overriding)
10515 binding is not DEFERRED.
10516 This is not the most efficient way to do this, but it should be ok and is
10517 clearer than something sophisticated. */
10519 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
10521 /* Walk bindings of this ancestor. */
10522 if (ancestor->f2k_derived)
10525 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10530 /* Find next ancestor type and recurse on it. */
10531 ancestor = gfc_get_derived_super_type (ancestor);
10533 return ensure_not_abstract (sub, ancestor);
10539 static void resolve_symbol (gfc_symbol *sym);
10542 /* Resolve the components of a derived type. */
10545 resolve_fl_derived (gfc_symbol *sym)
10547 gfc_symbol* super_type;
10551 super_type = gfc_get_derived_super_type (sym);
10554 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
10556 gfc_error ("As extending type '%s' at %L has a coarray component, "
10557 "parent type '%s' shall also have one", sym->name,
10558 &sym->declared_at, super_type->name);
10562 /* Ensure the extended type gets resolved before we do. */
10563 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10566 /* An ABSTRACT type must be extensible. */
10567 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10569 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10570 sym->name, &sym->declared_at);
10574 for (c = sym->components; c != NULL; c = c->next)
10577 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
10578 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
10580 gfc_error ("Coarray component '%s' at %L must be allocatable with "
10581 "deferred shape", c->name, &c->loc);
10586 if (c->attr.codimension && c->ts.type == BT_DERIVED
10587 && c->ts.u.derived->ts.is_iso_c)
10589 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
10590 "shall not be a coarray", c->name, &c->loc);
10595 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
10596 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
10597 || c->attr.allocatable))
10599 gfc_error ("Component '%s' at %L with coarray component "
10600 "shall be a nonpointer, nonallocatable scalar",
10605 if (c->attr.proc_pointer && c->ts.interface)
10607 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
10608 gfc_error ("Interface '%s', used by procedure pointer component "
10609 "'%s' at %L, is declared in a later PROCEDURE statement",
10610 c->ts.interface->name, c->name, &c->loc);
10612 /* Get the attributes from the interface (now resolved). */
10613 if (c->ts.interface->attr.if_source
10614 || c->ts.interface->attr.intrinsic)
10616 gfc_symbol *ifc = c->ts.interface;
10618 if (ifc->formal && !ifc->formal_ns)
10619 resolve_symbol (ifc);
10621 if (ifc->attr.intrinsic)
10622 resolve_intrinsic (ifc, &ifc->declared_at);
10626 c->ts = ifc->result->ts;
10627 c->attr.allocatable = ifc->result->attr.allocatable;
10628 c->attr.pointer = ifc->result->attr.pointer;
10629 c->attr.dimension = ifc->result->attr.dimension;
10630 c->as = gfc_copy_array_spec (ifc->result->as);
10635 c->attr.allocatable = ifc->attr.allocatable;
10636 c->attr.pointer = ifc->attr.pointer;
10637 c->attr.dimension = ifc->attr.dimension;
10638 c->as = gfc_copy_array_spec (ifc->as);
10640 c->ts.interface = ifc;
10641 c->attr.function = ifc->attr.function;
10642 c->attr.subroutine = ifc->attr.subroutine;
10643 gfc_copy_formal_args_ppc (c, ifc);
10645 c->attr.pure = ifc->attr.pure;
10646 c->attr.elemental = ifc->attr.elemental;
10647 c->attr.recursive = ifc->attr.recursive;
10648 c->attr.always_explicit = ifc->attr.always_explicit;
10649 c->attr.ext_attr |= ifc->attr.ext_attr;
10650 /* Replace symbols in array spec. */
10654 for (i = 0; i < c->as->rank; i++)
10656 gfc_expr_replace_comp (c->as->lower[i], c);
10657 gfc_expr_replace_comp (c->as->upper[i], c);
10660 /* Copy char length. */
10661 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10663 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10664 gfc_expr_replace_comp (cl->length, c);
10665 if (cl->length && !cl->resolved
10666 && gfc_resolve_expr (cl->length) == FAILURE)
10671 else if (c->ts.interface->name[0] != '\0' && !sym->attr.vtype)
10673 gfc_error ("Interface '%s' of procedure pointer component "
10674 "'%s' at %L must be explicit", c->ts.interface->name,
10679 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10681 /* Since PPCs are not implicitly typed, a PPC without an explicit
10682 interface must be a subroutine. */
10683 gfc_add_subroutine (&c->attr, c->name, &c->loc);
10686 /* Procedure pointer components: Check PASS arg. */
10687 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
10688 && !sym->attr.vtype)
10690 gfc_symbol* me_arg;
10692 if (c->tb->pass_arg)
10694 gfc_formal_arglist* i;
10696 /* If an explicit passing argument name is given, walk the arg-list
10697 and look for it. */
10700 c->tb->pass_arg_num = 1;
10701 for (i = c->formal; i; i = i->next)
10703 if (!strcmp (i->sym->name, c->tb->pass_arg))
10708 c->tb->pass_arg_num++;
10713 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10714 "at %L has no argument '%s'", c->name,
10715 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10722 /* Otherwise, take the first one; there should in fact be at least
10724 c->tb->pass_arg_num = 1;
10727 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10728 "must have at least one argument",
10733 me_arg = c->formal->sym;
10736 /* Now check that the argument-type matches. */
10737 gcc_assert (me_arg);
10738 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10739 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10740 || (me_arg->ts.type == BT_CLASS
10741 && me_arg->ts.u.derived->components->ts.u.derived != sym))
10743 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10744 " the derived type '%s'", me_arg->name, c->name,
10745 me_arg->name, &c->loc, sym->name);
10750 /* Check for C453. */
10751 if (me_arg->attr.dimension)
10753 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10754 "must be scalar", me_arg->name, c->name, me_arg->name,
10760 if (me_arg->attr.pointer)
10762 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10763 "may not have the POINTER attribute", me_arg->name,
10764 c->name, me_arg->name, &c->loc);
10769 if (me_arg->attr.allocatable)
10771 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10772 "may not be ALLOCATABLE", me_arg->name, c->name,
10773 me_arg->name, &c->loc);
10778 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
10779 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10780 " at %L", c->name, &c->loc);
10784 /* Check type-spec if this is not the parent-type component. */
10785 if ((!sym->attr.extension || c != sym->components)
10786 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
10789 /* If this type is an extension, set the accessibility of the parent
10791 if (super_type && c == sym->components
10792 && strcmp (super_type->name, c->name) == 0)
10793 c->attr.access = super_type->attr.access;
10795 /* If this type is an extension, see if this component has the same name
10796 as an inherited type-bound procedure. */
10798 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
10800 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
10801 " inherited type-bound procedure",
10802 c->name, sym->name, &c->loc);
10806 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
10808 if (c->ts.u.cl->length == NULL
10809 || (resolve_charlen (c->ts.u.cl) == FAILURE)
10810 || !gfc_is_constant_expr (c->ts.u.cl->length))
10812 gfc_error ("Character length of component '%s' needs to "
10813 "be a constant specification expression at %L",
10815 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
10820 if (c->ts.type == BT_DERIVED
10821 && sym->component_access != ACCESS_PRIVATE
10822 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10823 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
10824 && !c->ts.u.derived->attr.use_assoc
10825 && !gfc_check_access (c->ts.u.derived->attr.access,
10826 c->ts.u.derived->ns->default_access)
10827 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
10828 "is a PRIVATE type and cannot be a component of "
10829 "'%s', which is PUBLIC at %L", c->name,
10830 sym->name, &sym->declared_at) == FAILURE)
10833 if (sym->attr.sequence)
10835 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
10837 gfc_error ("Component %s of SEQUENCE type declared at %L does "
10838 "not have the SEQUENCE attribute",
10839 c->ts.u.derived->name, &sym->declared_at);
10844 if (c->ts.type == BT_DERIVED && c->attr.pointer
10845 && c->ts.u.derived->components == NULL
10846 && !c->ts.u.derived->attr.zero_comp)
10848 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10849 "that has not been declared", c->name, sym->name,
10855 if (c->ts.type == BT_CLASS
10856 && !(c->ts.u.derived->components->attr.pointer
10857 || c->ts.u.derived->components->attr.allocatable))
10859 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
10860 "or pointer", c->name, &c->loc);
10864 /* Ensure that all the derived type components are put on the
10865 derived type list; even in formal namespaces, where derived type
10866 pointer components might not have been declared. */
10867 if (c->ts.type == BT_DERIVED
10869 && c->ts.u.derived->components
10871 && sym != c->ts.u.derived)
10872 add_dt_to_dt_list (c->ts.u.derived);
10874 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
10878 for (i = 0; i < c->as->rank; i++)
10880 if (c->as->lower[i] == NULL
10881 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
10882 || !gfc_is_constant_expr (c->as->lower[i])
10883 || c->as->upper[i] == NULL
10884 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
10885 || !gfc_is_constant_expr (c->as->upper[i]))
10887 gfc_error ("Component '%s' of '%s' at %L must have "
10888 "constant array bounds",
10889 c->name, sym->name, &c->loc);
10895 /* Resolve the type-bound procedures. */
10896 if (resolve_typebound_procedures (sym) == FAILURE)
10899 /* Resolve the finalizer procedures. */
10900 if (gfc_resolve_finalizers (sym) == FAILURE)
10903 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
10904 all DEFERRED bindings are overridden. */
10905 if (super_type && super_type->attr.abstract && !sym->attr.abstract
10906 && ensure_not_abstract (sym, super_type) == FAILURE)
10909 /* Add derived type to the derived type list. */
10910 add_dt_to_dt_list (sym);
10917 resolve_fl_namelist (gfc_symbol *sym)
10922 /* Reject PRIVATE objects in a PUBLIC namelist. */
10923 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
10925 for (nl = sym->namelist; nl; nl = nl->next)
10927 if (!nl->sym->attr.use_assoc
10928 && !is_sym_host_assoc (nl->sym, sym->ns)
10929 && !gfc_check_access(nl->sym->attr.access,
10930 nl->sym->ns->default_access))
10932 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
10933 "cannot be member of PUBLIC namelist '%s' at %L",
10934 nl->sym->name, sym->name, &sym->declared_at);
10938 /* Types with private components that came here by USE-association. */
10939 if (nl->sym->ts.type == BT_DERIVED
10940 && derived_inaccessible (nl->sym->ts.u.derived))
10942 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
10943 "components and cannot be member of namelist '%s' at %L",
10944 nl->sym->name, sym->name, &sym->declared_at);
10948 /* Types with private components that are defined in the same module. */
10949 if (nl->sym->ts.type == BT_DERIVED
10950 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
10951 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
10952 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
10953 nl->sym->ns->default_access))
10955 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
10956 "cannot be a member of PUBLIC namelist '%s' at %L",
10957 nl->sym->name, sym->name, &sym->declared_at);
10963 for (nl = sym->namelist; nl; nl = nl->next)
10965 /* Reject namelist arrays of assumed shape. */
10966 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
10967 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
10968 "must not have assumed shape in namelist "
10969 "'%s' at %L", nl->sym->name, sym->name,
10970 &sym->declared_at) == FAILURE)
10973 /* Reject namelist arrays that are not constant shape. */
10974 if (is_non_constant_shape_array (nl->sym))
10976 gfc_error ("NAMELIST array object '%s' must have constant "
10977 "shape in namelist '%s' at %L", nl->sym->name,
10978 sym->name, &sym->declared_at);
10982 /* Namelist objects cannot have allocatable or pointer components. */
10983 if (nl->sym->ts.type != BT_DERIVED)
10986 if (nl->sym->ts.u.derived->attr.alloc_comp)
10988 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10989 "have ALLOCATABLE components",
10990 nl->sym->name, sym->name, &sym->declared_at);
10994 if (nl->sym->ts.u.derived->attr.pointer_comp)
10996 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10997 "have POINTER components",
10998 nl->sym->name, sym->name, &sym->declared_at);
11004 /* 14.1.2 A module or internal procedure represent local entities
11005 of the same type as a namelist member and so are not allowed. */
11006 for (nl = sym->namelist; nl; nl = nl->next)
11008 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11011 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11012 if ((nl->sym == sym->ns->proc_name)
11014 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11018 if (nl->sym && nl->sym->name)
11019 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11020 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11022 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11023 "attribute in '%s' at %L", nlsym->name,
11024 &sym->declared_at);
11034 resolve_fl_parameter (gfc_symbol *sym)
11036 /* A parameter array's shape needs to be constant. */
11037 if (sym->as != NULL
11038 && (sym->as->type == AS_DEFERRED
11039 || is_non_constant_shape_array (sym)))
11041 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11042 "or of deferred shape", sym->name, &sym->declared_at);
11046 /* Make sure a parameter that has been implicitly typed still
11047 matches the implicit type, since PARAMETER statements can precede
11048 IMPLICIT statements. */
11049 if (sym->attr.implicit_type
11050 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11053 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11054 "later IMPLICIT type", sym->name, &sym->declared_at);
11058 /* Make sure the types of derived parameters are consistent. This
11059 type checking is deferred until resolution because the type may
11060 refer to a derived type from the host. */
11061 if (sym->ts.type == BT_DERIVED
11062 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11064 gfc_error ("Incompatible derived type in PARAMETER at %L",
11065 &sym->value->where);
11072 /* Do anything necessary to resolve a symbol. Right now, we just
11073 assume that an otherwise unknown symbol is a variable. This sort
11074 of thing commonly happens for symbols in module. */
11077 resolve_symbol (gfc_symbol *sym)
11079 int check_constant, mp_flag;
11080 gfc_symtree *symtree;
11081 gfc_symtree *this_symtree;
11085 if (sym->attr.flavor == FL_UNKNOWN)
11088 /* If we find that a flavorless symbol is an interface in one of the
11089 parent namespaces, find its symtree in this namespace, free the
11090 symbol and set the symtree to point to the interface symbol. */
11091 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
11093 symtree = gfc_find_symtree (ns->sym_root, sym->name);
11094 if (symtree && symtree->n.sym->generic)
11096 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
11100 gfc_free_symbol (sym);
11101 symtree->n.sym->refs++;
11102 this_symtree->n.sym = symtree->n.sym;
11107 /* Otherwise give it a flavor according to such attributes as
11109 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
11110 sym->attr.flavor = FL_VARIABLE;
11113 sym->attr.flavor = FL_PROCEDURE;
11114 if (sym->attr.dimension)
11115 sym->attr.function = 1;
11119 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
11120 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
11122 if (sym->attr.procedure && sym->ts.interface
11123 && sym->attr.if_source != IFSRC_DECL)
11125 if (sym->ts.interface == sym)
11127 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
11128 "interface", sym->name, &sym->declared_at);
11131 if (sym->ts.interface->attr.procedure)
11133 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
11134 " in a later PROCEDURE statement", sym->ts.interface->name,
11135 sym->name,&sym->declared_at);
11139 /* Get the attributes from the interface (now resolved). */
11140 if (sym->ts.interface->attr.if_source
11141 || sym->ts.interface->attr.intrinsic)
11143 gfc_symbol *ifc = sym->ts.interface;
11144 resolve_symbol (ifc);
11146 if (ifc->attr.intrinsic)
11147 resolve_intrinsic (ifc, &ifc->declared_at);
11150 sym->ts = ifc->result->ts;
11153 sym->ts.interface = ifc;
11154 sym->attr.function = ifc->attr.function;
11155 sym->attr.subroutine = ifc->attr.subroutine;
11156 gfc_copy_formal_args (sym, ifc);
11158 sym->attr.allocatable = ifc->attr.allocatable;
11159 sym->attr.pointer = ifc->attr.pointer;
11160 sym->attr.pure = ifc->attr.pure;
11161 sym->attr.elemental = ifc->attr.elemental;
11162 sym->attr.dimension = ifc->attr.dimension;
11163 sym->attr.recursive = ifc->attr.recursive;
11164 sym->attr.always_explicit = ifc->attr.always_explicit;
11165 sym->attr.ext_attr |= ifc->attr.ext_attr;
11166 /* Copy array spec. */
11167 sym->as = gfc_copy_array_spec (ifc->as);
11171 for (i = 0; i < sym->as->rank; i++)
11173 gfc_expr_replace_symbols (sym->as->lower[i], sym);
11174 gfc_expr_replace_symbols (sym->as->upper[i], sym);
11177 /* Copy char length. */
11178 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11180 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11181 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
11182 if (sym->ts.u.cl->length && !sym->ts.u.cl->resolved
11183 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
11187 else if (sym->ts.interface->name[0] != '\0')
11189 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
11190 sym->ts.interface->name, sym->name, &sym->declared_at);
11195 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
11198 /* Symbols that are module procedures with results (functions) have
11199 the types and array specification copied for type checking in
11200 procedures that call them, as well as for saving to a module
11201 file. These symbols can't stand the scrutiny that their results
11203 mp_flag = (sym->result != NULL && sym->result != sym);
11206 /* Make sure that the intrinsic is consistent with its internal
11207 representation. This needs to be done before assigning a default
11208 type to avoid spurious warnings. */
11209 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
11210 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
11213 /* Assign default type to symbols that need one and don't have one. */
11214 if (sym->ts.type == BT_UNKNOWN)
11216 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
11217 gfc_set_default_type (sym, 1, NULL);
11219 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
11220 && !sym->attr.function && !sym->attr.subroutine
11221 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
11222 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
11224 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
11226 /* The specific case of an external procedure should emit an error
11227 in the case that there is no implicit type. */
11229 gfc_set_default_type (sym, sym->attr.external, NULL);
11232 /* Result may be in another namespace. */
11233 resolve_symbol (sym->result);
11235 if (!sym->result->attr.proc_pointer)
11237 sym->ts = sym->result->ts;
11238 sym->as = gfc_copy_array_spec (sym->result->as);
11239 sym->attr.dimension = sym->result->attr.dimension;
11240 sym->attr.pointer = sym->result->attr.pointer;
11241 sym->attr.allocatable = sym->result->attr.allocatable;
11247 /* Assumed size arrays and assumed shape arrays must be dummy
11250 if (sym->as != NULL
11251 && ((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
11252 || sym->as->type == AS_ASSUMED_SHAPE)
11253 && sym->attr.dummy == 0)
11255 if (sym->as->type == AS_ASSUMED_SIZE)
11256 gfc_error ("Assumed size array at %L must be a dummy argument",
11257 &sym->declared_at);
11259 gfc_error ("Assumed shape array at %L must be a dummy argument",
11260 &sym->declared_at);
11264 /* Make sure symbols with known intent or optional are really dummy
11265 variable. Because of ENTRY statement, this has to be deferred
11266 until resolution time. */
11268 if (!sym->attr.dummy
11269 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
11271 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
11275 if (sym->attr.value && !sym->attr.dummy)
11277 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
11278 "it is not a dummy argument", sym->name, &sym->declared_at);
11282 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
11284 gfc_charlen *cl = sym->ts.u.cl;
11285 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
11287 gfc_error ("Character dummy variable '%s' at %L with VALUE "
11288 "attribute must have constant length",
11289 sym->name, &sym->declared_at);
11293 if (sym->ts.is_c_interop
11294 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
11296 gfc_error ("C interoperable character dummy variable '%s' at %L "
11297 "with VALUE attribute must have length one",
11298 sym->name, &sym->declared_at);
11303 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
11304 do this for something that was implicitly typed because that is handled
11305 in gfc_set_default_type. Handle dummy arguments and procedure
11306 definitions separately. Also, anything that is use associated is not
11307 handled here but instead is handled in the module it is declared in.
11308 Finally, derived type definitions are allowed to be BIND(C) since that
11309 only implies that they're interoperable, and they are checked fully for
11310 interoperability when a variable is declared of that type. */
11311 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
11312 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
11313 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
11315 gfc_try t = SUCCESS;
11317 /* First, make sure the variable is declared at the
11318 module-level scope (J3/04-007, Section 15.3). */
11319 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
11320 sym->attr.in_common == 0)
11322 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
11323 "is neither a COMMON block nor declared at the "
11324 "module level scope", sym->name, &(sym->declared_at));
11327 else if (sym->common_head != NULL)
11329 t = verify_com_block_vars_c_interop (sym->common_head);
11333 /* If type() declaration, we need to verify that the components
11334 of the given type are all C interoperable, etc. */
11335 if (sym->ts.type == BT_DERIVED &&
11336 sym->ts.u.derived->attr.is_c_interop != 1)
11338 /* Make sure the user marked the derived type as BIND(C). If
11339 not, call the verify routine. This could print an error
11340 for the derived type more than once if multiple variables
11341 of that type are declared. */
11342 if (sym->ts.u.derived->attr.is_bind_c != 1)
11343 verify_bind_c_derived_type (sym->ts.u.derived);
11347 /* Verify the variable itself as C interoperable if it
11348 is BIND(C). It is not possible for this to succeed if
11349 the verify_bind_c_derived_type failed, so don't have to handle
11350 any error returned by verify_bind_c_derived_type. */
11351 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
11352 sym->common_block);
11357 /* clear the is_bind_c flag to prevent reporting errors more than
11358 once if something failed. */
11359 sym->attr.is_bind_c = 0;
11364 /* If a derived type symbol has reached this point, without its
11365 type being declared, we have an error. Notice that most
11366 conditions that produce undefined derived types have already
11367 been dealt with. However, the likes of:
11368 implicit type(t) (t) ..... call foo (t) will get us here if
11369 the type is not declared in the scope of the implicit
11370 statement. Change the type to BT_UNKNOWN, both because it is so
11371 and to prevent an ICE. */
11372 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
11373 && !sym->ts.u.derived->attr.zero_comp)
11375 gfc_error ("The derived type '%s' at %L is of type '%s', "
11376 "which has not been defined", sym->name,
11377 &sym->declared_at, sym->ts.u.derived->name);
11378 sym->ts.type = BT_UNKNOWN;
11382 /* Make sure that the derived type has been resolved and that the
11383 derived type is visible in the symbol's namespace, if it is a
11384 module function and is not PRIVATE. */
11385 if (sym->ts.type == BT_DERIVED
11386 && sym->ts.u.derived->attr.use_assoc
11387 && sym->ns->proc_name
11388 && sym->ns->proc_name->attr.flavor == FL_MODULE)
11392 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
11395 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
11396 if (!ds && sym->attr.function
11397 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11399 symtree = gfc_new_symtree (&sym->ns->sym_root,
11400 sym->ts.u.derived->name);
11401 symtree->n.sym = sym->ts.u.derived;
11402 sym->ts.u.derived->refs++;
11406 /* Unless the derived-type declaration is use associated, Fortran 95
11407 does not allow public entries of private derived types.
11408 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
11409 161 in 95-006r3. */
11410 if (sym->ts.type == BT_DERIVED
11411 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
11412 && !sym->ts.u.derived->attr.use_assoc
11413 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11414 && !gfc_check_access (sym->ts.u.derived->attr.access,
11415 sym->ts.u.derived->ns->default_access)
11416 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
11417 "of PRIVATE derived type '%s'",
11418 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
11419 : "variable", sym->name, &sym->declared_at,
11420 sym->ts.u.derived->name) == FAILURE)
11423 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
11424 default initialization is defined (5.1.2.4.4). */
11425 if (sym->ts.type == BT_DERIVED
11427 && sym->attr.intent == INTENT_OUT
11429 && sym->as->type == AS_ASSUMED_SIZE)
11431 for (c = sym->ts.u.derived->components; c; c = c->next)
11433 if (c->initializer)
11435 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
11436 "ASSUMED SIZE and so cannot have a default initializer",
11437 sym->name, &sym->declared_at);
11444 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11445 || sym->attr.codimension)
11446 && sym->attr.result)
11447 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
11448 "a coarray component", sym->name, &sym->declared_at);
11451 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
11452 && sym->ts.u.derived->ts.is_iso_c)
11453 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11454 "shall not be a coarray", sym->name, &sym->declared_at);
11457 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
11458 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
11459 || sym->attr.allocatable))
11460 gfc_error ("Variable '%s' at %L with coarray component "
11461 "shall be a nonpointer, nonallocatable scalar",
11462 sym->name, &sym->declared_at);
11464 /* F2008, C526. The function-result case was handled above. */
11465 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11466 || sym->attr.codimension)
11467 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
11468 || sym->ns->proc_name->attr.flavor == FL_MODULE
11469 || sym->ns->proc_name->attr.is_main_program
11470 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
11471 gfc_error ("Variable '%s' at %L is a coarray or has a coarray "
11472 "component and is not ALLOCATABLE, SAVE nor a "
11473 "dummy argument", sym->name, &sym->declared_at);
11474 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
11475 else if (sym->attr.codimension && !sym->attr.allocatable
11476 && sym->as && sym->as->cotype == AS_DEFERRED)
11477 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
11478 "deferred shape", sym->name, &sym->declared_at);
11479 else if (sym->attr.codimension && sym->attr.allocatable
11480 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
11481 gfc_error ("Allocatable coarray variable '%s' at %L must have "
11482 "deferred shape", sym->name, &sym->declared_at);
11486 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11487 || (sym->attr.codimension && sym->attr.allocatable))
11488 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
11489 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
11490 "allocatable coarray or have coarray components",
11491 sym->name, &sym->declared_at);
11493 if (sym->attr.codimension && sym->attr.dummy
11494 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
11495 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
11496 "procedure '%s'", sym->name, &sym->declared_at,
11497 sym->ns->proc_name->name);
11499 switch (sym->attr.flavor)
11502 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
11507 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
11512 if (resolve_fl_namelist (sym) == FAILURE)
11517 if (resolve_fl_parameter (sym) == FAILURE)
11525 /* Resolve array specifier. Check as well some constraints
11526 on COMMON blocks. */
11528 check_constant = sym->attr.in_common && !sym->attr.pointer;
11530 /* Set the formal_arg_flag so that check_conflict will not throw
11531 an error for host associated variables in the specification
11532 expression for an array_valued function. */
11533 if (sym->attr.function && sym->as)
11534 formal_arg_flag = 1;
11536 gfc_resolve_array_spec (sym->as, check_constant);
11538 formal_arg_flag = 0;
11540 /* Resolve formal namespaces. */
11541 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11542 && !sym->attr.contained && !sym->attr.intrinsic)
11543 gfc_resolve (sym->formal_ns);
11545 /* Make sure the formal namespace is present. */
11546 if (sym->formal && !sym->formal_ns)
11548 gfc_formal_arglist *formal = sym->formal;
11549 while (formal && !formal->sym)
11550 formal = formal->next;
11554 sym->formal_ns = formal->sym->ns;
11555 sym->formal_ns->refs++;
11559 /* Check threadprivate restrictions. */
11560 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11561 && (!sym->attr.in_common
11562 && sym->module == NULL
11563 && (sym->ns->proc_name == NULL
11564 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11565 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11567 /* If we have come this far we can apply default-initializers, as
11568 described in 14.7.5, to those variables that have not already
11569 been assigned one. */
11570 if (sym->ts.type == BT_DERIVED
11571 && sym->attr.referenced
11572 && sym->ns == gfc_current_ns
11574 && !sym->attr.allocatable
11575 && !sym->attr.alloc_comp)
11577 symbol_attribute *a = &sym->attr;
11579 if ((!a->save && !a->dummy && !a->pointer
11580 && !a->in_common && !a->use_assoc
11581 && !(a->function && sym != sym->result))
11582 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11583 apply_default_init (sym);
11586 /* If this symbol has a type-spec, check it. */
11587 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11588 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11589 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11595 /************* Resolve DATA statements *************/
11599 gfc_data_value *vnode;
11605 /* Advance the values structure to point to the next value in the data list. */
11608 next_data_value (void)
11610 while (mpz_cmp_ui (values.left, 0) == 0)
11613 if (values.vnode->next == NULL)
11616 values.vnode = values.vnode->next;
11617 mpz_set (values.left, values.vnode->repeat);
11625 check_data_variable (gfc_data_variable *var, locus *where)
11631 ar_type mark = AR_UNKNOWN;
11633 mpz_t section_index[GFC_MAX_DIMENSIONS];
11639 if (gfc_resolve_expr (var->expr) == FAILURE)
11643 mpz_init_set_si (offset, 0);
11646 if (e->expr_type != EXPR_VARIABLE)
11647 gfc_internal_error ("check_data_variable(): Bad expression");
11649 sym = e->symtree->n.sym;
11651 if (sym->ns->is_block_data && !sym->attr.in_common)
11653 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11654 sym->name, &sym->declared_at);
11657 if (e->ref == NULL && sym->as)
11659 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11660 " declaration", sym->name, where);
11664 has_pointer = sym->attr.pointer;
11666 for (ref = e->ref; ref; ref = ref->next)
11668 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11671 if (ref->type == REF_ARRAY && ref->u.ar.codimen)
11673 gfc_error ("DATA element '%s' at %L cannot have a coindex",
11679 && ref->type == REF_ARRAY
11680 && ref->u.ar.type != AR_FULL)
11682 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11683 "be a full array", sym->name, where);
11688 if (e->rank == 0 || has_pointer)
11690 mpz_init_set_ui (size, 1);
11697 /* Find the array section reference. */
11698 for (ref = e->ref; ref; ref = ref->next)
11700 if (ref->type != REF_ARRAY)
11702 if (ref->u.ar.type == AR_ELEMENT)
11708 /* Set marks according to the reference pattern. */
11709 switch (ref->u.ar.type)
11717 /* Get the start position of array section. */
11718 gfc_get_section_index (ar, section_index, &offset);
11723 gcc_unreachable ();
11726 if (gfc_array_size (e, &size) == FAILURE)
11728 gfc_error ("Nonconstant array section at %L in DATA statement",
11730 mpz_clear (offset);
11737 while (mpz_cmp_ui (size, 0) > 0)
11739 if (next_data_value () == FAILURE)
11741 gfc_error ("DATA statement at %L has more variables than values",
11747 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
11751 /* If we have more than one element left in the repeat count,
11752 and we have more than one element left in the target variable,
11753 then create a range assignment. */
11754 /* FIXME: Only done for full arrays for now, since array sections
11756 if (mark == AR_FULL && ref && ref->next == NULL
11757 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
11761 if (mpz_cmp (size, values.left) >= 0)
11763 mpz_init_set (range, values.left);
11764 mpz_sub (size, size, values.left);
11765 mpz_set_ui (values.left, 0);
11769 mpz_init_set (range, size);
11770 mpz_sub (values.left, values.left, size);
11771 mpz_set_ui (size, 0);
11774 gfc_assign_data_value_range (var->expr, values.vnode->expr,
11777 mpz_add (offset, offset, range);
11781 /* Assign initial value to symbol. */
11784 mpz_sub_ui (values.left, values.left, 1);
11785 mpz_sub_ui (size, size, 1);
11787 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
11791 if (mark == AR_FULL)
11792 mpz_add_ui (offset, offset, 1);
11794 /* Modify the array section indexes and recalculate the offset
11795 for next element. */
11796 else if (mark == AR_SECTION)
11797 gfc_advance_section (section_index, ar, &offset);
11801 if (mark == AR_SECTION)
11803 for (i = 0; i < ar->dimen; i++)
11804 mpz_clear (section_index[i]);
11808 mpz_clear (offset);
11814 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
11816 /* Iterate over a list of elements in a DATA statement. */
11819 traverse_data_list (gfc_data_variable *var, locus *where)
11822 iterator_stack frame;
11823 gfc_expr *e, *start, *end, *step;
11824 gfc_try retval = SUCCESS;
11826 mpz_init (frame.value);
11828 start = gfc_copy_expr (var->iter.start);
11829 end = gfc_copy_expr (var->iter.end);
11830 step = gfc_copy_expr (var->iter.step);
11832 if (gfc_simplify_expr (start, 1) == FAILURE
11833 || start->expr_type != EXPR_CONSTANT)
11835 gfc_error ("iterator start at %L does not simplify", &start->where);
11839 if (gfc_simplify_expr (end, 1) == FAILURE
11840 || end->expr_type != EXPR_CONSTANT)
11842 gfc_error ("iterator end at %L does not simplify", &end->where);
11846 if (gfc_simplify_expr (step, 1) == FAILURE
11847 || step->expr_type != EXPR_CONSTANT)
11849 gfc_error ("iterator step at %L does not simplify", &step->where);
11854 mpz_init_set (trip, end->value.integer);
11855 mpz_sub (trip, trip, start->value.integer);
11856 mpz_add (trip, trip, step->value.integer);
11858 mpz_div (trip, trip, step->value.integer);
11860 mpz_set (frame.value, start->value.integer);
11862 frame.prev = iter_stack;
11863 frame.variable = var->iter.var->symtree;
11864 iter_stack = &frame;
11866 while (mpz_cmp_ui (trip, 0) > 0)
11868 if (traverse_data_var (var->list, where) == FAILURE)
11875 e = gfc_copy_expr (var->expr);
11876 if (gfc_simplify_expr (e, 1) == FAILURE)
11884 mpz_add (frame.value, frame.value, step->value.integer);
11886 mpz_sub_ui (trip, trip, 1);
11891 mpz_clear (frame.value);
11893 gfc_free_expr (start);
11894 gfc_free_expr (end);
11895 gfc_free_expr (step);
11897 iter_stack = frame.prev;
11902 /* Type resolve variables in the variable list of a DATA statement. */
11905 traverse_data_var (gfc_data_variable *var, locus *where)
11909 for (; var; var = var->next)
11911 if (var->expr == NULL)
11912 t = traverse_data_list (var, where);
11914 t = check_data_variable (var, where);
11924 /* Resolve the expressions and iterators associated with a data statement.
11925 This is separate from the assignment checking because data lists should
11926 only be resolved once. */
11929 resolve_data_variables (gfc_data_variable *d)
11931 for (; d; d = d->next)
11933 if (d->list == NULL)
11935 if (gfc_resolve_expr (d->expr) == FAILURE)
11940 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
11943 if (resolve_data_variables (d->list) == FAILURE)
11952 /* Resolve a single DATA statement. We implement this by storing a pointer to
11953 the value list into static variables, and then recursively traversing the
11954 variables list, expanding iterators and such. */
11957 resolve_data (gfc_data *d)
11960 if (resolve_data_variables (d->var) == FAILURE)
11963 values.vnode = d->value;
11964 if (d->value == NULL)
11965 mpz_set_ui (values.left, 0);
11967 mpz_set (values.left, d->value->repeat);
11969 if (traverse_data_var (d->var, &d->where) == FAILURE)
11972 /* At this point, we better not have any values left. */
11974 if (next_data_value () == SUCCESS)
11975 gfc_error ("DATA statement at %L has more values than variables",
11980 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
11981 accessed by host or use association, is a dummy argument to a pure function,
11982 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
11983 is storage associated with any such variable, shall not be used in the
11984 following contexts: (clients of this function). */
11986 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
11987 procedure. Returns zero if assignment is OK, nonzero if there is a
11990 gfc_impure_variable (gfc_symbol *sym)
11995 if (sym->attr.use_assoc || sym->attr.in_common)
11998 /* Check if the symbol's ns is inside the pure procedure. */
11999 for (ns = gfc_current_ns; ns; ns = ns->parent)
12003 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12007 proc = sym->ns->proc_name;
12008 if (sym->attr.dummy && gfc_pure (proc)
12009 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12011 proc->attr.function))
12014 /* TODO: Sort out what can be storage associated, if anything, and include
12015 it here. In principle equivalences should be scanned but it does not
12016 seem to be possible to storage associate an impure variable this way. */
12021 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12022 current namespace is inside a pure procedure. */
12025 gfc_pure (gfc_symbol *sym)
12027 symbol_attribute attr;
12032 /* Check if the current namespace or one of its parents
12033 belongs to a pure procedure. */
12034 for (ns = gfc_current_ns; ns; ns = ns->parent)
12036 sym = ns->proc_name;
12040 if (attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental))
12048 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
12052 /* Test whether the current procedure is elemental or not. */
12055 gfc_elemental (gfc_symbol *sym)
12057 symbol_attribute attr;
12060 sym = gfc_current_ns->proc_name;
12065 return attr.flavor == FL_PROCEDURE && attr.elemental;
12069 /* Warn about unused labels. */
12072 warn_unused_fortran_label (gfc_st_label *label)
12077 warn_unused_fortran_label (label->left);
12079 if (label->defined == ST_LABEL_UNKNOWN)
12082 switch (label->referenced)
12084 case ST_LABEL_UNKNOWN:
12085 gfc_warning ("Label %d at %L defined but not used", label->value,
12089 case ST_LABEL_BAD_TARGET:
12090 gfc_warning ("Label %d at %L defined but cannot be used",
12091 label->value, &label->where);
12098 warn_unused_fortran_label (label->right);
12102 /* Returns the sequence type of a symbol or sequence. */
12105 sequence_type (gfc_typespec ts)
12114 if (ts.u.derived->components == NULL)
12115 return SEQ_NONDEFAULT;
12117 result = sequence_type (ts.u.derived->components->ts);
12118 for (c = ts.u.derived->components->next; c; c = c->next)
12119 if (sequence_type (c->ts) != result)
12125 if (ts.kind != gfc_default_character_kind)
12126 return SEQ_NONDEFAULT;
12128 return SEQ_CHARACTER;
12131 if (ts.kind != gfc_default_integer_kind)
12132 return SEQ_NONDEFAULT;
12134 return SEQ_NUMERIC;
12137 if (!(ts.kind == gfc_default_real_kind
12138 || ts.kind == gfc_default_double_kind))
12139 return SEQ_NONDEFAULT;
12141 return SEQ_NUMERIC;
12144 if (ts.kind != gfc_default_complex_kind)
12145 return SEQ_NONDEFAULT;
12147 return SEQ_NUMERIC;
12150 if (ts.kind != gfc_default_logical_kind)
12151 return SEQ_NONDEFAULT;
12153 return SEQ_NUMERIC;
12156 return SEQ_NONDEFAULT;
12161 /* Resolve derived type EQUIVALENCE object. */
12164 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
12166 gfc_component *c = derived->components;
12171 /* Shall not be an object of nonsequence derived type. */
12172 if (!derived->attr.sequence)
12174 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
12175 "attribute to be an EQUIVALENCE object", sym->name,
12180 /* Shall not have allocatable components. */
12181 if (derived->attr.alloc_comp)
12183 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
12184 "components to be an EQUIVALENCE object",sym->name,
12189 if (sym->attr.in_common && has_default_initializer (sym->ts.u.derived))
12191 gfc_error ("Derived type variable '%s' at %L with default "
12192 "initialization cannot be in EQUIVALENCE with a variable "
12193 "in COMMON", sym->name, &e->where);
12197 for (; c ; c = c->next)
12199 if (c->ts.type == BT_DERIVED
12200 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
12203 /* Shall not be an object of sequence derived type containing a pointer
12204 in the structure. */
12205 if (c->attr.pointer)
12207 gfc_error ("Derived type variable '%s' at %L with pointer "
12208 "component(s) cannot be an EQUIVALENCE object",
12209 sym->name, &e->where);
12217 /* Resolve equivalence object.
12218 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
12219 an allocatable array, an object of nonsequence derived type, an object of
12220 sequence derived type containing a pointer at any level of component
12221 selection, an automatic object, a function name, an entry name, a result
12222 name, a named constant, a structure component, or a subobject of any of
12223 the preceding objects. A substring shall not have length zero. A
12224 derived type shall not have components with default initialization nor
12225 shall two objects of an equivalence group be initialized.
12226 Either all or none of the objects shall have an protected attribute.
12227 The simple constraints are done in symbol.c(check_conflict) and the rest
12228 are implemented here. */
12231 resolve_equivalence (gfc_equiv *eq)
12234 gfc_symbol *first_sym;
12237 locus *last_where = NULL;
12238 seq_type eq_type, last_eq_type;
12239 gfc_typespec *last_ts;
12240 int object, cnt_protected;
12243 last_ts = &eq->expr->symtree->n.sym->ts;
12245 first_sym = eq->expr->symtree->n.sym;
12249 for (object = 1; eq; eq = eq->eq, object++)
12253 e->ts = e->symtree->n.sym->ts;
12254 /* match_varspec might not know yet if it is seeing
12255 array reference or substring reference, as it doesn't
12257 if (e->ref && e->ref->type == REF_ARRAY)
12259 gfc_ref *ref = e->ref;
12260 sym = e->symtree->n.sym;
12262 if (sym->attr.dimension)
12264 ref->u.ar.as = sym->as;
12268 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
12269 if (e->ts.type == BT_CHARACTER
12271 && ref->type == REF_ARRAY
12272 && ref->u.ar.dimen == 1
12273 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
12274 && ref->u.ar.stride[0] == NULL)
12276 gfc_expr *start = ref->u.ar.start[0];
12277 gfc_expr *end = ref->u.ar.end[0];
12280 /* Optimize away the (:) reference. */
12281 if (start == NULL && end == NULL)
12284 e->ref = ref->next;
12286 e->ref->next = ref->next;
12291 ref->type = REF_SUBSTRING;
12293 start = gfc_get_int_expr (gfc_default_integer_kind,
12295 ref->u.ss.start = start;
12296 if (end == NULL && e->ts.u.cl)
12297 end = gfc_copy_expr (e->ts.u.cl->length);
12298 ref->u.ss.end = end;
12299 ref->u.ss.length = e->ts.u.cl;
12306 /* Any further ref is an error. */
12309 gcc_assert (ref->type == REF_ARRAY);
12310 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
12316 if (gfc_resolve_expr (e) == FAILURE)
12319 sym = e->symtree->n.sym;
12321 if (sym->attr.is_protected)
12323 if (cnt_protected > 0 && cnt_protected != object)
12325 gfc_error ("Either all or none of the objects in the "
12326 "EQUIVALENCE set at %L shall have the "
12327 "PROTECTED attribute",
12332 /* Shall not equivalence common block variables in a PURE procedure. */
12333 if (sym->ns->proc_name
12334 && sym->ns->proc_name->attr.pure
12335 && sym->attr.in_common)
12337 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
12338 "object in the pure procedure '%s'",
12339 sym->name, &e->where, sym->ns->proc_name->name);
12343 /* Shall not be a named constant. */
12344 if (e->expr_type == EXPR_CONSTANT)
12346 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
12347 "object", sym->name, &e->where);
12351 if (e->ts.type == BT_DERIVED
12352 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
12355 /* Check that the types correspond correctly:
12357 A numeric sequence structure may be equivalenced to another sequence
12358 structure, an object of default integer type, default real type, double
12359 precision real type, default logical type such that components of the
12360 structure ultimately only become associated to objects of the same
12361 kind. A character sequence structure may be equivalenced to an object
12362 of default character kind or another character sequence structure.
12363 Other objects may be equivalenced only to objects of the same type and
12364 kind parameters. */
12366 /* Identical types are unconditionally OK. */
12367 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
12368 goto identical_types;
12370 last_eq_type = sequence_type (*last_ts);
12371 eq_type = sequence_type (sym->ts);
12373 /* Since the pair of objects is not of the same type, mixed or
12374 non-default sequences can be rejected. */
12376 msg = "Sequence %s with mixed components in EQUIVALENCE "
12377 "statement at %L with different type objects";
12379 && last_eq_type == SEQ_MIXED
12380 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
12382 || (eq_type == SEQ_MIXED
12383 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12384 &e->where) == FAILURE))
12387 msg = "Non-default type object or sequence %s in EQUIVALENCE "
12388 "statement at %L with objects of different type";
12390 && last_eq_type == SEQ_NONDEFAULT
12391 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
12392 last_where) == FAILURE)
12393 || (eq_type == SEQ_NONDEFAULT
12394 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12395 &e->where) == FAILURE))
12398 msg ="Non-CHARACTER object '%s' in default CHARACTER "
12399 "EQUIVALENCE statement at %L";
12400 if (last_eq_type == SEQ_CHARACTER
12401 && eq_type != SEQ_CHARACTER
12402 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12403 &e->where) == FAILURE)
12406 msg ="Non-NUMERIC object '%s' in default NUMERIC "
12407 "EQUIVALENCE statement at %L";
12408 if (last_eq_type == SEQ_NUMERIC
12409 && eq_type != SEQ_NUMERIC
12410 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12411 &e->where) == FAILURE)
12416 last_where = &e->where;
12421 /* Shall not be an automatic array. */
12422 if (e->ref->type == REF_ARRAY
12423 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
12425 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
12426 "an EQUIVALENCE object", sym->name, &e->where);
12433 /* Shall not be a structure component. */
12434 if (r->type == REF_COMPONENT)
12436 gfc_error ("Structure component '%s' at %L cannot be an "
12437 "EQUIVALENCE object",
12438 r->u.c.component->name, &e->where);
12442 /* A substring shall not have length zero. */
12443 if (r->type == REF_SUBSTRING)
12445 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
12447 gfc_error ("Substring at %L has length zero",
12448 &r->u.ss.start->where);
12458 /* Resolve function and ENTRY types, issue diagnostics if needed. */
12461 resolve_fntype (gfc_namespace *ns)
12463 gfc_entry_list *el;
12466 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
12469 /* If there are any entries, ns->proc_name is the entry master
12470 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
12472 sym = ns->entries->sym;
12474 sym = ns->proc_name;
12475 if (sym->result == sym
12476 && sym->ts.type == BT_UNKNOWN
12477 && gfc_set_default_type (sym, 0, NULL) == FAILURE
12478 && !sym->attr.untyped)
12480 gfc_error ("Function '%s' at %L has no IMPLICIT type",
12481 sym->name, &sym->declared_at);
12482 sym->attr.untyped = 1;
12485 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
12486 && !sym->attr.contained
12487 && !gfc_check_access (sym->ts.u.derived->attr.access,
12488 sym->ts.u.derived->ns->default_access)
12489 && gfc_check_access (sym->attr.access, sym->ns->default_access))
12491 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
12492 "%L of PRIVATE type '%s'", sym->name,
12493 &sym->declared_at, sym->ts.u.derived->name);
12497 for (el = ns->entries->next; el; el = el->next)
12499 if (el->sym->result == el->sym
12500 && el->sym->ts.type == BT_UNKNOWN
12501 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
12502 && !el->sym->attr.untyped)
12504 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
12505 el->sym->name, &el->sym->declared_at);
12506 el->sym->attr.untyped = 1;
12512 /* 12.3.2.1.1 Defined operators. */
12515 check_uop_procedure (gfc_symbol *sym, locus where)
12517 gfc_formal_arglist *formal;
12519 if (!sym->attr.function)
12521 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
12522 sym->name, &where);
12526 if (sym->ts.type == BT_CHARACTER
12527 && !(sym->ts.u.cl && sym->ts.u.cl->length)
12528 && !(sym->result && sym->result->ts.u.cl
12529 && sym->result->ts.u.cl->length))
12531 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
12532 "character length", sym->name, &where);
12536 formal = sym->formal;
12537 if (!formal || !formal->sym)
12539 gfc_error ("User operator procedure '%s' at %L must have at least "
12540 "one argument", sym->name, &where);
12544 if (formal->sym->attr.intent != INTENT_IN)
12546 gfc_error ("First argument of operator interface at %L must be "
12547 "INTENT(IN)", &where);
12551 if (formal->sym->attr.optional)
12553 gfc_error ("First argument of operator interface at %L cannot be "
12554 "optional", &where);
12558 formal = formal->next;
12559 if (!formal || !formal->sym)
12562 if (formal->sym->attr.intent != INTENT_IN)
12564 gfc_error ("Second argument of operator interface at %L must be "
12565 "INTENT(IN)", &where);
12569 if (formal->sym->attr.optional)
12571 gfc_error ("Second argument of operator interface at %L cannot be "
12572 "optional", &where);
12578 gfc_error ("Operator interface at %L must have, at most, two "
12579 "arguments", &where);
12587 gfc_resolve_uops (gfc_symtree *symtree)
12589 gfc_interface *itr;
12591 if (symtree == NULL)
12594 gfc_resolve_uops (symtree->left);
12595 gfc_resolve_uops (symtree->right);
12597 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12598 check_uop_procedure (itr->sym, itr->sym->declared_at);
12602 /* Examine all of the expressions associated with a program unit,
12603 assign types to all intermediate expressions, make sure that all
12604 assignments are to compatible types and figure out which names
12605 refer to which functions or subroutines. It doesn't check code
12606 block, which is handled by resolve_code. */
12609 resolve_types (gfc_namespace *ns)
12615 gfc_namespace* old_ns = gfc_current_ns;
12617 /* Check that all IMPLICIT types are ok. */
12618 if (!ns->seen_implicit_none)
12621 for (letter = 0; letter != GFC_LETTERS; ++letter)
12622 if (ns->set_flag[letter]
12623 && resolve_typespec_used (&ns->default_type[letter],
12624 &ns->implicit_loc[letter],
12629 gfc_current_ns = ns;
12631 resolve_entries (ns);
12633 resolve_common_vars (ns->blank_common.head, false);
12634 resolve_common_blocks (ns->common_root);
12636 resolve_contained_functions (ns);
12638 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12640 for (cl = ns->cl_list; cl; cl = cl->next)
12641 resolve_charlen (cl);
12643 gfc_traverse_ns (ns, resolve_symbol);
12645 resolve_fntype (ns);
12647 for (n = ns->contained; n; n = n->sibling)
12649 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12650 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12651 "also be PURE", n->proc_name->name,
12652 &n->proc_name->declared_at);
12658 gfc_check_interfaces (ns);
12660 gfc_traverse_ns (ns, resolve_values);
12666 for (d = ns->data; d; d = d->next)
12670 gfc_traverse_ns (ns, gfc_formalize_init_value);
12672 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12674 if (ns->common_root != NULL)
12675 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12677 for (eq = ns->equiv; eq; eq = eq->next)
12678 resolve_equivalence (eq);
12680 /* Warn about unused labels. */
12681 if (warn_unused_label)
12682 warn_unused_fortran_label (ns->st_labels);
12684 gfc_resolve_uops (ns->uop_root);
12686 gfc_current_ns = old_ns;
12690 /* Call resolve_code recursively. */
12693 resolve_codes (gfc_namespace *ns)
12696 bitmap_obstack old_obstack;
12698 for (n = ns->contained; n; n = n->sibling)
12701 gfc_current_ns = ns;
12703 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
12704 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
12707 /* Set to an out of range value. */
12708 current_entry_id = -1;
12710 old_obstack = labels_obstack;
12711 bitmap_obstack_initialize (&labels_obstack);
12713 resolve_code (ns->code, ns);
12715 bitmap_obstack_release (&labels_obstack);
12716 labels_obstack = old_obstack;
12720 /* This function is called after a complete program unit has been compiled.
12721 Its purpose is to examine all of the expressions associated with a program
12722 unit, assign types to all intermediate expressions, make sure that all
12723 assignments are to compatible types and figure out which names refer to
12724 which functions or subroutines. */
12727 gfc_resolve (gfc_namespace *ns)
12729 gfc_namespace *old_ns;
12730 code_stack *old_cs_base;
12736 old_ns = gfc_current_ns;
12737 old_cs_base = cs_base;
12739 resolve_types (ns);
12740 resolve_codes (ns);
12742 gfc_current_ns = old_ns;
12743 cs_base = old_cs_base;