1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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 */
33 /* Types used in equivalence statements. */
37 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
41 /* Stack to keep track of the nesting of blocks as we move through the
42 code. See resolve_branch() and resolve_code(). */
44 typedef struct code_stack
46 struct gfc_code *head, *current;
47 struct code_stack *prev;
49 /* This bitmap keeps track of the targets valid for a branch from
50 inside this block except for END {IF|SELECT}s of enclosing
52 bitmap reachable_labels;
56 static code_stack *cs_base = NULL;
59 /* Nonzero if we're inside a FORALL block. */
61 static int forall_flag;
63 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
65 static int omp_workshare_flag;
67 /* Nonzero if we are processing a formal arglist. The corresponding function
68 resets the flag each time that it is read. */
69 static int formal_arg_flag = 0;
71 /* True if we are resolving a specification expression. */
72 static int specification_expr = 0;
74 /* The id of the last entry seen. */
75 static int current_entry_id;
77 /* We use bitmaps to determine if a branch target is valid. */
78 static bitmap_obstack labels_obstack;
81 gfc_is_formal_arg (void)
83 return formal_arg_flag;
86 /* Is the symbol host associated? */
88 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
90 for (ns = ns->parent; ns; ns = ns->parent)
99 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
100 an ABSTRACT derived-type. If where is not NULL, an error message with that
101 locus is printed, optionally using name. */
104 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
106 if (ts->type == BT_DERIVED && ts->derived->attr.abstract)
111 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
112 name, where, ts->derived->name);
114 gfc_error ("ABSTRACT type '%s' used at %L",
115 ts->derived->name, where);
125 /* Resolve types of formal argument lists. These have to be done early so that
126 the formal argument lists of module procedures can be copied to the
127 containing module before the individual procedures are resolved
128 individually. We also resolve argument lists of procedures in interface
129 blocks because they are self-contained scoping units.
131 Since a dummy argument cannot be a non-dummy procedure, the only
132 resort left for untyped names are the IMPLICIT types. */
135 resolve_formal_arglist (gfc_symbol *proc)
137 gfc_formal_arglist *f;
141 if (proc->result != NULL)
146 if (gfc_elemental (proc)
147 || sym->attr.pointer || sym->attr.allocatable
148 || (sym->as && sym->as->rank > 0))
150 proc->attr.always_explicit = 1;
151 sym->attr.always_explicit = 1;
156 for (f = proc->formal; f; f = f->next)
162 /* Alternate return placeholder. */
163 if (gfc_elemental (proc))
164 gfc_error ("Alternate return specifier in elemental subroutine "
165 "'%s' at %L is not allowed", proc->name,
167 if (proc->attr.function)
168 gfc_error ("Alternate return specifier in function "
169 "'%s' at %L is not allowed", proc->name,
174 if (sym->attr.if_source != IFSRC_UNKNOWN)
175 resolve_formal_arglist (sym);
177 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
179 if (gfc_pure (proc) && !gfc_pure (sym))
181 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
182 "also be PURE", sym->name, &sym->declared_at);
186 if (gfc_elemental (proc))
188 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
189 "procedure", &sym->declared_at);
193 if (sym->attr.function
194 && sym->ts.type == BT_UNKNOWN
195 && sym->attr.intrinsic)
197 gfc_intrinsic_sym *isym;
198 isym = gfc_find_function (sym->name);
199 if (isym == NULL || !isym->specific)
201 gfc_error ("Unable to find a specific INTRINSIC procedure "
202 "for the reference '%s' at %L", sym->name,
211 if (sym->ts.type == BT_UNKNOWN)
213 if (!sym->attr.function || sym->result == sym)
214 gfc_set_default_type (sym, 1, sym->ns);
217 gfc_resolve_array_spec (sym->as, 0);
219 /* We can't tell if an array with dimension (:) is assumed or deferred
220 shape until we know if it has the pointer or allocatable attributes.
222 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
223 && !(sym->attr.pointer || sym->attr.allocatable))
225 sym->as->type = AS_ASSUMED_SHAPE;
226 for (i = 0; i < sym->as->rank; i++)
227 sym->as->lower[i] = gfc_int_expr (1);
230 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
231 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
232 || sym->attr.optional)
234 proc->attr.always_explicit = 1;
236 proc->result->attr.always_explicit = 1;
239 /* If the flavor is unknown at this point, it has to be a variable.
240 A procedure specification would have already set the type. */
242 if (sym->attr.flavor == FL_UNKNOWN)
243 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
245 if (gfc_pure (proc) && !sym->attr.pointer
246 && sym->attr.flavor != FL_PROCEDURE)
248 if (proc->attr.function && sym->attr.intent != INTENT_IN)
249 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
250 "INTENT(IN)", sym->name, proc->name,
253 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
254 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
255 "have its INTENT specified", sym->name, proc->name,
259 if (gfc_elemental (proc))
263 gfc_error ("Argument '%s' of elemental procedure at %L must "
264 "be scalar", sym->name, &sym->declared_at);
268 if (sym->attr.pointer)
270 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
271 "have the POINTER attribute", sym->name,
276 if (sym->attr.flavor == FL_PROCEDURE)
278 gfc_error ("Dummy procedure '%s' not allowed in elemental "
279 "procedure '%s' at %L", sym->name, proc->name,
285 /* Each dummy shall be specified to be scalar. */
286 if (proc->attr.proc == PROC_ST_FUNCTION)
290 gfc_error ("Argument '%s' of statement function at %L must "
291 "be scalar", sym->name, &sym->declared_at);
295 if (sym->ts.type == BT_CHARACTER)
297 gfc_charlen *cl = sym->ts.cl;
298 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
300 gfc_error ("Character-valued argument '%s' of statement "
301 "function at %L must have constant length",
302 sym->name, &sym->declared_at);
312 /* Work function called when searching for symbols that have argument lists
313 associated with them. */
316 find_arglists (gfc_symbol *sym)
318 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
321 resolve_formal_arglist (sym);
325 /* Given a namespace, resolve all formal argument lists within the namespace.
329 resolve_formal_arglists (gfc_namespace *ns)
334 gfc_traverse_ns (ns, find_arglists);
339 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
343 /* If this namespace is not a function or an entry master function,
345 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
346 || sym->attr.entry_master)
349 /* Try to find out of what the return type is. */
350 if (sym->result->ts.type == BT_UNKNOWN)
352 t = gfc_set_default_type (sym->result, 0, ns);
354 if (t == FAILURE && !sym->result->attr.untyped)
356 if (sym->result == sym)
357 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
358 sym->name, &sym->declared_at);
359 else if (!sym->result->attr.proc_pointer)
360 gfc_error ("Result '%s' of contained function '%s' at %L has "
361 "no IMPLICIT type", sym->result->name, sym->name,
362 &sym->result->declared_at);
363 sym->result->attr.untyped = 1;
367 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
368 type, lists the only ways a character length value of * can be used:
369 dummy arguments of procedures, named constants, and function results
370 in external functions. Internal function results are not on that list;
371 ergo, not permitted. */
373 if (sym->result->ts.type == BT_CHARACTER)
375 gfc_charlen *cl = sym->result->ts.cl;
376 if (!cl || !cl->length)
377 gfc_error ("Character-valued internal function '%s' at %L must "
378 "not be assumed length", sym->name, &sym->declared_at);
383 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
384 introduce duplicates. */
387 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
389 gfc_formal_arglist *f, *new_arglist;
392 for (; new_args != NULL; new_args = new_args->next)
394 new_sym = new_args->sym;
395 /* See if this arg is already in the formal argument list. */
396 for (f = proc->formal; f; f = f->next)
398 if (new_sym == f->sym)
405 /* Add a new argument. Argument order is not important. */
406 new_arglist = gfc_get_formal_arglist ();
407 new_arglist->sym = new_sym;
408 new_arglist->next = proc->formal;
409 proc->formal = new_arglist;
414 /* Flag the arguments that are not present in all entries. */
417 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
419 gfc_formal_arglist *f, *head;
422 for (f = proc->formal; f; f = f->next)
427 for (new_args = head; new_args; new_args = new_args->next)
429 if (new_args->sym == f->sym)
436 f->sym->attr.not_always_present = 1;
441 /* Resolve alternate entry points. If a symbol has multiple entry points we
442 create a new master symbol for the main routine, and turn the existing
443 symbol into an entry point. */
446 resolve_entries (gfc_namespace *ns)
448 gfc_namespace *old_ns;
452 char name[GFC_MAX_SYMBOL_LEN + 1];
453 static int master_count = 0;
455 if (ns->proc_name == NULL)
458 /* No need to do anything if this procedure doesn't have alternate entry
463 /* We may already have resolved alternate entry points. */
464 if (ns->proc_name->attr.entry_master)
467 /* If this isn't a procedure something has gone horribly wrong. */
468 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
470 /* Remember the current namespace. */
471 old_ns = gfc_current_ns;
475 /* Add the main entry point to the list of entry points. */
476 el = gfc_get_entry_list ();
477 el->sym = ns->proc_name;
479 el->next = ns->entries;
481 ns->proc_name->attr.entry = 1;
483 /* If it is a module function, it needs to be in the right namespace
484 so that gfc_get_fake_result_decl can gather up the results. The
485 need for this arose in get_proc_name, where these beasts were
486 left in their own namespace, to keep prior references linked to
487 the entry declaration.*/
488 if (ns->proc_name->attr.function
489 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
492 /* Do the same for entries where the master is not a module
493 procedure. These are retained in the module namespace because
494 of the module procedure declaration. */
495 for (el = el->next; el; el = el->next)
496 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
497 && el->sym->attr.mod_proc)
501 /* Add an entry statement for it. */
508 /* Create a new symbol for the master function. */
509 /* Give the internal function a unique name (within this file).
510 Also include the function name so the user has some hope of figuring
511 out what is going on. */
512 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
513 master_count++, ns->proc_name->name);
514 gfc_get_ha_symbol (name, &proc);
515 gcc_assert (proc != NULL);
517 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
518 if (ns->proc_name->attr.subroutine)
519 gfc_add_subroutine (&proc->attr, proc->name, NULL);
523 gfc_typespec *ts, *fts;
524 gfc_array_spec *as, *fas;
525 gfc_add_function (&proc->attr, proc->name, NULL);
527 fas = ns->entries->sym->as;
528 fas = fas ? fas : ns->entries->sym->result->as;
529 fts = &ns->entries->sym->result->ts;
530 if (fts->type == BT_UNKNOWN)
531 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
532 for (el = ns->entries->next; el; el = el->next)
534 ts = &el->sym->result->ts;
536 as = as ? as : el->sym->result->as;
537 if (ts->type == BT_UNKNOWN)
538 ts = gfc_get_default_type (el->sym->result->name, NULL);
540 if (! gfc_compare_types (ts, fts)
541 || (el->sym->result->attr.dimension
542 != ns->entries->sym->result->attr.dimension)
543 || (el->sym->result->attr.pointer
544 != ns->entries->sym->result->attr.pointer))
546 else if (as && fas && ns->entries->sym->result != el->sym->result
547 && gfc_compare_array_spec (as, fas) == 0)
548 gfc_error ("Function %s at %L has entries with mismatched "
549 "array specifications", ns->entries->sym->name,
550 &ns->entries->sym->declared_at);
551 /* The characteristics need to match and thus both need to have
552 the same string length, i.e. both len=*, or both len=4.
553 Having both len=<variable> is also possible, but difficult to
554 check at compile time. */
555 else if (ts->type == BT_CHARACTER && ts->cl && fts->cl
556 && (((ts->cl->length && !fts->cl->length)
557 ||(!ts->cl->length && fts->cl->length))
559 && ts->cl->length->expr_type
560 != fts->cl->length->expr_type)
562 && ts->cl->length->expr_type == EXPR_CONSTANT
563 && mpz_cmp (ts->cl->length->value.integer,
564 fts->cl->length->value.integer) != 0)))
565 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
566 "entries returning variables of different "
567 "string lengths", ns->entries->sym->name,
568 &ns->entries->sym->declared_at);
573 sym = ns->entries->sym->result;
574 /* All result types the same. */
576 if (sym->attr.dimension)
577 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
578 if (sym->attr.pointer)
579 gfc_add_pointer (&proc->attr, NULL);
583 /* Otherwise the result will be passed through a union by
585 proc->attr.mixed_entry_master = 1;
586 for (el = ns->entries; el; el = el->next)
588 sym = el->sym->result;
589 if (sym->attr.dimension)
591 if (el == ns->entries)
592 gfc_error ("FUNCTION result %s can't be an array in "
593 "FUNCTION %s at %L", sym->name,
594 ns->entries->sym->name, &sym->declared_at);
596 gfc_error ("ENTRY result %s can't be an array in "
597 "FUNCTION %s at %L", sym->name,
598 ns->entries->sym->name, &sym->declared_at);
600 else if (sym->attr.pointer)
602 if (el == ns->entries)
603 gfc_error ("FUNCTION result %s can't be a POINTER in "
604 "FUNCTION %s at %L", sym->name,
605 ns->entries->sym->name, &sym->declared_at);
607 gfc_error ("ENTRY result %s can't be a POINTER in "
608 "FUNCTION %s at %L", sym->name,
609 ns->entries->sym->name, &sym->declared_at);
614 if (ts->type == BT_UNKNOWN)
615 ts = gfc_get_default_type (sym->name, NULL);
619 if (ts->kind == gfc_default_integer_kind)
623 if (ts->kind == gfc_default_real_kind
624 || ts->kind == gfc_default_double_kind)
628 if (ts->kind == gfc_default_complex_kind)
632 if (ts->kind == gfc_default_logical_kind)
636 /* We will issue error elsewhere. */
644 if (el == ns->entries)
645 gfc_error ("FUNCTION result %s can't be of type %s "
646 "in FUNCTION %s at %L", sym->name,
647 gfc_typename (ts), ns->entries->sym->name,
650 gfc_error ("ENTRY result %s can't be of type %s "
651 "in FUNCTION %s at %L", sym->name,
652 gfc_typename (ts), ns->entries->sym->name,
659 proc->attr.access = ACCESS_PRIVATE;
660 proc->attr.entry_master = 1;
662 /* Merge all the entry point arguments. */
663 for (el = ns->entries; el; el = el->next)
664 merge_argument_lists (proc, el->sym->formal);
666 /* Check the master formal arguments for any that are not
667 present in all entry points. */
668 for (el = ns->entries; el; el = el->next)
669 check_argument_lists (proc, el->sym->formal);
671 /* Use the master function for the function body. */
672 ns->proc_name = proc;
674 /* Finalize the new symbols. */
675 gfc_commit_symbols ();
677 /* Restore the original namespace. */
678 gfc_current_ns = old_ns;
683 has_default_initializer (gfc_symbol *der)
687 gcc_assert (der->attr.flavor == FL_DERIVED);
688 for (c = der->components; c; c = c->next)
689 if ((c->ts.type != BT_DERIVED && c->initializer)
690 || (c->ts.type == BT_DERIVED
691 && (!c->attr.pointer && has_default_initializer (c->ts.derived))))
697 /* Resolve common variables. */
699 resolve_common_vars (gfc_symbol *sym, bool named_common)
701 gfc_symbol *csym = sym;
703 for (; csym; csym = csym->common_next)
705 if (csym->value || csym->attr.data)
707 if (!csym->ns->is_block_data)
708 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
709 "but only in BLOCK DATA initialization is "
710 "allowed", csym->name, &csym->declared_at);
711 else if (!named_common)
712 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
713 "in a blank COMMON but initialization is only "
714 "allowed in named common blocks", csym->name,
718 if (csym->ts.type != BT_DERIVED)
721 if (!(csym->ts.derived->attr.sequence
722 || csym->ts.derived->attr.is_bind_c))
723 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
724 "has neither the SEQUENCE nor the BIND(C) "
725 "attribute", csym->name, &csym->declared_at);
726 if (csym->ts.derived->attr.alloc_comp)
727 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
728 "has an ultimate component that is "
729 "allocatable", csym->name, &csym->declared_at);
730 if (has_default_initializer (csym->ts.derived))
731 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
732 "may not have default initializer", csym->name,
735 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
736 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
740 /* Resolve common blocks. */
742 resolve_common_blocks (gfc_symtree *common_root)
746 if (common_root == NULL)
749 if (common_root->left)
750 resolve_common_blocks (common_root->left);
751 if (common_root->right)
752 resolve_common_blocks (common_root->right);
754 resolve_common_vars (common_root->n.common->head, true);
756 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
760 if (sym->attr.flavor == FL_PARAMETER)
761 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
762 sym->name, &common_root->n.common->where, &sym->declared_at);
764 if (sym->attr.intrinsic)
765 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
766 sym->name, &common_root->n.common->where);
767 else if (sym->attr.result
768 ||(sym->attr.function && gfc_current_ns->proc_name == sym))
769 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
770 "that is also a function result", sym->name,
771 &common_root->n.common->where);
772 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
773 && sym->attr.proc != PROC_ST_FUNCTION)
774 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
775 "that is also a global procedure", sym->name,
776 &common_root->n.common->where);
780 /* Resolve contained function types. Because contained functions can call one
781 another, they have to be worked out before any of the contained procedures
784 The good news is that if a function doesn't already have a type, the only
785 way it can get one is through an IMPLICIT type or a RESULT variable, because
786 by definition contained functions are contained namespace they're contained
787 in, not in a sibling or parent namespace. */
790 resolve_contained_functions (gfc_namespace *ns)
792 gfc_namespace *child;
795 resolve_formal_arglists (ns);
797 for (child = ns->contained; child; child = child->sibling)
799 /* Resolve alternate entry points first. */
800 resolve_entries (child);
802 /* Then check function return types. */
803 resolve_contained_fntype (child->proc_name, child);
804 for (el = child->entries; el; el = el->next)
805 resolve_contained_fntype (el->sym, child);
810 /* Resolve all of the elements of a structure constructor and make sure that
811 the types are correct. */
814 resolve_structure_cons (gfc_expr *expr)
816 gfc_constructor *cons;
822 cons = expr->value.constructor;
823 /* A constructor may have references if it is the result of substituting a
824 parameter variable. In this case we just pull out the component we
827 comp = expr->ref->u.c.sym->components;
829 comp = expr->ts.derived->components;
831 /* See if the user is trying to invoke a structure constructor for one of
832 the iso_c_binding derived types. */
833 if (expr->ts.derived && expr->ts.derived->ts.is_iso_c && cons
834 && cons->expr != NULL)
836 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
837 expr->ts.derived->name, &(expr->where));
841 for (; comp; comp = comp->next, cons = cons->next)
848 if (gfc_resolve_expr (cons->expr) == FAILURE)
854 rank = comp->as ? comp->as->rank : 0;
855 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
856 && (comp->attr.allocatable || cons->expr->rank))
858 gfc_error ("The rank of the element in the derived type "
859 "constructor at %L does not match that of the "
860 "component (%d/%d)", &cons->expr->where,
861 cons->expr->rank, rank);
865 /* If we don't have the right type, try to convert it. */
867 if (!gfc_compare_types (&cons->expr->ts, &comp->ts))
870 if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
871 gfc_error ("The element in the derived type constructor at %L, "
872 "for pointer component '%s', is %s but should be %s",
873 &cons->expr->where, comp->name,
874 gfc_basic_typename (cons->expr->ts.type),
875 gfc_basic_typename (comp->ts.type));
877 t = gfc_convert_type (cons->expr, &comp->ts, 1);
880 if (cons->expr->expr_type == EXPR_NULL
881 && !(comp->attr.pointer || comp->attr.allocatable
882 || comp->attr.proc_pointer))
885 gfc_error ("The NULL in the derived type constructor at %L is "
886 "being applied to component '%s', which is neither "
887 "a POINTER nor ALLOCATABLE", &cons->expr->where,
891 if (!comp->attr.pointer || cons->expr->expr_type == EXPR_NULL)
894 a = gfc_expr_attr (cons->expr);
896 if (!a.pointer && !a.target)
899 gfc_error ("The element in the derived type constructor at %L, "
900 "for pointer component '%s' should be a POINTER or "
901 "a TARGET", &cons->expr->where, comp->name);
909 /****************** Expression name resolution ******************/
911 /* Returns 0 if a symbol was not declared with a type or
912 attribute declaration statement, nonzero otherwise. */
915 was_declared (gfc_symbol *sym)
921 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
924 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
925 || a.optional || a.pointer || a.save || a.target || a.volatile_
926 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN)
933 /* Determine if a symbol is generic or not. */
936 generic_sym (gfc_symbol *sym)
940 if (sym->attr.generic ||
941 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
944 if (was_declared (sym) || sym->ns->parent == NULL)
947 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
954 return generic_sym (s);
961 /* Determine if a symbol is specific or not. */
964 specific_sym (gfc_symbol *sym)
968 if (sym->attr.if_source == IFSRC_IFBODY
969 || sym->attr.proc == PROC_MODULE
970 || sym->attr.proc == PROC_INTERNAL
971 || sym->attr.proc == PROC_ST_FUNCTION
972 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
973 || sym->attr.external)
976 if (was_declared (sym) || sym->ns->parent == NULL)
979 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
981 return (s == NULL) ? 0 : specific_sym (s);
985 /* Figure out if the procedure is specific, generic or unknown. */
988 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
992 procedure_kind (gfc_symbol *sym)
994 if (generic_sym (sym))
995 return PTYPE_GENERIC;
997 if (specific_sym (sym))
998 return PTYPE_SPECIFIC;
1000 return PTYPE_UNKNOWN;
1003 /* Check references to assumed size arrays. The flag need_full_assumed_size
1004 is nonzero when matching actual arguments. */
1006 static int need_full_assumed_size = 0;
1009 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1011 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1014 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1015 What should it be? */
1016 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1017 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1018 && (e->ref->u.ar.type == AR_FULL))
1020 gfc_error ("The upper bound in the last dimension must "
1021 "appear in the reference to the assumed size "
1022 "array '%s' at %L", sym->name, &e->where);
1029 /* Look for bad assumed size array references in argument expressions
1030 of elemental and array valued intrinsic procedures. Since this is
1031 called from procedure resolution functions, it only recurses at
1035 resolve_assumed_size_actual (gfc_expr *e)
1040 switch (e->expr_type)
1043 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1048 if (resolve_assumed_size_actual (e->value.op.op1)
1049 || resolve_assumed_size_actual (e->value.op.op2))
1060 /* Check a generic procedure, passed as an actual argument, to see if
1061 there is a matching specific name. If none, it is an error, and if
1062 more than one, the reference is ambiguous. */
1064 count_specific_procs (gfc_expr *e)
1071 sym = e->symtree->n.sym;
1073 for (p = sym->generic; p; p = p->next)
1074 if (strcmp (sym->name, p->sym->name) == 0)
1076 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1082 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1086 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1087 "argument at %L", sym->name, &e->where);
1093 /* See if a call to sym could possibly be a not allowed RECURSION because of
1094 a missing RECURIVE declaration. This means that either sym is the current
1095 context itself, or sym is the parent of a contained procedure calling its
1096 non-RECURSIVE containing procedure.
1097 This also works if sym is an ENTRY. */
1100 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1102 gfc_symbol* proc_sym;
1103 gfc_symbol* context_proc;
1105 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1107 /* If we've got an ENTRY, find real procedure. */
1108 if (sym->attr.entry && sym->ns->entries)
1109 proc_sym = sym->ns->entries->sym;
1113 /* If sym is RECURSIVE, all is well of course. */
1114 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1117 /* Find the context procdure's "real" symbol if it has entries. */
1118 context_proc = (context->entries ? context->entries->sym
1119 : context->proc_name);
1123 /* A call from sym's body to itself is recursion, of course. */
1124 if (context_proc == proc_sym)
1127 /* The same is true if context is a contained procedure and sym the
1129 if (context_proc->attr.contained)
1131 gfc_symbol* parent_proc;
1133 gcc_assert (context->parent);
1134 parent_proc = (context->parent->entries ? context->parent->entries->sym
1135 : context->parent->proc_name);
1137 if (parent_proc == proc_sym)
1145 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1146 its typespec and formal argument list. */
1149 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1151 gfc_intrinsic_sym *isym = gfc_find_function (sym->name);
1154 if (!sym->attr.function &&
1155 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1161 isym = gfc_find_subroutine (sym->name);
1163 if (!sym->attr.subroutine &&
1164 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1168 gfc_copy_formal_args_intr (sym, isym);
1173 /* Resolve a procedure expression, like passing it to a called procedure or as
1174 RHS for a procedure pointer assignment. */
1177 resolve_procedure_expression (gfc_expr* expr)
1181 if (expr->expr_type != EXPR_VARIABLE)
1183 gcc_assert (expr->symtree);
1185 sym = expr->symtree->n.sym;
1187 if (sym->attr.intrinsic)
1188 resolve_intrinsic (sym, &expr->where);
1190 if (sym->attr.flavor != FL_PROCEDURE
1191 || (sym->attr.function && sym->result == sym))
1194 /* A non-RECURSIVE procedure that is used as procedure expression within its
1195 own body is in danger of being called recursively. */
1196 if (is_illegal_recursion (sym, gfc_current_ns))
1197 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1198 " itself recursively. Declare it RECURSIVE or use"
1199 " -frecursive", sym->name, &expr->where);
1205 /* Resolve an actual argument list. Most of the time, this is just
1206 resolving the expressions in the list.
1207 The exception is that we sometimes have to decide whether arguments
1208 that look like procedure arguments are really simple variable
1212 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1213 bool no_formal_args)
1216 gfc_symtree *parent_st;
1218 int save_need_full_assumed_size;
1219 gfc_component *comp;
1221 for (; arg; arg = arg->next)
1226 /* Check the label is a valid branching target. */
1229 if (arg->label->defined == ST_LABEL_UNKNOWN)
1231 gfc_error ("Label %d referenced at %L is never defined",
1232 arg->label->value, &arg->label->where);
1239 if (is_proc_ptr_comp (e, &comp))
1242 e->expr_type = EXPR_VARIABLE;
1246 if (e->expr_type == EXPR_VARIABLE
1247 && e->symtree->n.sym->attr.generic
1249 && count_specific_procs (e) != 1)
1252 if (e->ts.type != BT_PROCEDURE)
1254 save_need_full_assumed_size = need_full_assumed_size;
1255 if (e->expr_type != EXPR_VARIABLE)
1256 need_full_assumed_size = 0;
1257 if (gfc_resolve_expr (e) != SUCCESS)
1259 need_full_assumed_size = save_need_full_assumed_size;
1263 /* See if the expression node should really be a variable reference. */
1265 sym = e->symtree->n.sym;
1267 if (sym->attr.flavor == FL_PROCEDURE
1268 || sym->attr.intrinsic
1269 || sym->attr.external)
1273 /* If a procedure is not already determined to be something else
1274 check if it is intrinsic. */
1275 if (!sym->attr.intrinsic
1276 && !(sym->attr.external || sym->attr.use_assoc
1277 || sym->attr.if_source == IFSRC_IFBODY)
1278 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1279 sym->attr.intrinsic = 1;
1281 if (sym->attr.proc == PROC_ST_FUNCTION)
1283 gfc_error ("Statement function '%s' at %L is not allowed as an "
1284 "actual argument", sym->name, &e->where);
1287 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1288 sym->attr.subroutine);
1289 if (sym->attr.intrinsic && actual_ok == 0)
1291 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1292 "actual argument", sym->name, &e->where);
1295 if (sym->attr.contained && !sym->attr.use_assoc
1296 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1298 gfc_error ("Internal procedure '%s' is not allowed as an "
1299 "actual argument at %L", sym->name, &e->where);
1302 if (sym->attr.elemental && !sym->attr.intrinsic)
1304 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1305 "allowed as an actual argument at %L", sym->name,
1309 /* Check if a generic interface has a specific procedure
1310 with the same name before emitting an error. */
1311 if (sym->attr.generic && count_specific_procs (e) != 1)
1314 /* Just in case a specific was found for the expression. */
1315 sym = e->symtree->n.sym;
1317 /* If the symbol is the function that names the current (or
1318 parent) scope, then we really have a variable reference. */
1320 if (sym->attr.function && sym->result == sym
1321 && (sym->ns->proc_name == sym
1322 || (sym->ns->parent != NULL
1323 && sym->ns->parent->proc_name == sym)))
1326 /* If all else fails, see if we have a specific intrinsic. */
1327 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1329 gfc_intrinsic_sym *isym;
1331 isym = gfc_find_function (sym->name);
1332 if (isym == NULL || !isym->specific)
1334 gfc_error ("Unable to find a specific INTRINSIC procedure "
1335 "for the reference '%s' at %L", sym->name,
1340 sym->attr.intrinsic = 1;
1341 sym->attr.function = 1;
1344 if (gfc_resolve_expr (e) == FAILURE)
1349 /* See if the name is a module procedure in a parent unit. */
1351 if (was_declared (sym) || sym->ns->parent == NULL)
1354 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1356 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1360 if (parent_st == NULL)
1363 sym = parent_st->n.sym;
1364 e->symtree = parent_st; /* Point to the right thing. */
1366 if (sym->attr.flavor == FL_PROCEDURE
1367 || sym->attr.intrinsic
1368 || sym->attr.external)
1370 if (gfc_resolve_expr (e) == FAILURE)
1376 e->expr_type = EXPR_VARIABLE;
1378 if (sym->as != NULL)
1380 e->rank = sym->as->rank;
1381 e->ref = gfc_get_ref ();
1382 e->ref->type = REF_ARRAY;
1383 e->ref->u.ar.type = AR_FULL;
1384 e->ref->u.ar.as = sym->as;
1387 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1388 primary.c (match_actual_arg). If above code determines that it
1389 is a variable instead, it needs to be resolved as it was not
1390 done at the beginning of this function. */
1391 save_need_full_assumed_size = need_full_assumed_size;
1392 if (e->expr_type != EXPR_VARIABLE)
1393 need_full_assumed_size = 0;
1394 if (gfc_resolve_expr (e) != SUCCESS)
1396 need_full_assumed_size = save_need_full_assumed_size;
1399 /* Check argument list functions %VAL, %LOC and %REF. There is
1400 nothing to do for %REF. */
1401 if (arg->name && arg->name[0] == '%')
1403 if (strncmp ("%VAL", arg->name, 4) == 0)
1405 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1407 gfc_error ("By-value argument at %L is not of numeric "
1414 gfc_error ("By-value argument at %L cannot be an array or "
1415 "an array section", &e->where);
1419 /* Intrinsics are still PROC_UNKNOWN here. However,
1420 since same file external procedures are not resolvable
1421 in gfortran, it is a good deal easier to leave them to
1423 if (ptype != PROC_UNKNOWN
1424 && ptype != PROC_DUMMY
1425 && ptype != PROC_EXTERNAL
1426 && ptype != PROC_MODULE)
1428 gfc_error ("By-value argument at %L is not allowed "
1429 "in this context", &e->where);
1434 /* Statement functions have already been excluded above. */
1435 else if (strncmp ("%LOC", arg->name, 4) == 0
1436 && e->ts.type == BT_PROCEDURE)
1438 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1440 gfc_error ("Passing internal procedure at %L by location "
1441 "not allowed", &e->where);
1452 /* Do the checks of the actual argument list that are specific to elemental
1453 procedures. If called with c == NULL, we have a function, otherwise if
1454 expr == NULL, we have a subroutine. */
1457 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1459 gfc_actual_arglist *arg0;
1460 gfc_actual_arglist *arg;
1461 gfc_symbol *esym = NULL;
1462 gfc_intrinsic_sym *isym = NULL;
1464 gfc_intrinsic_arg *iformal = NULL;
1465 gfc_formal_arglist *eformal = NULL;
1466 bool formal_optional = false;
1467 bool set_by_optional = false;
1471 /* Is this an elemental procedure? */
1472 if (expr && expr->value.function.actual != NULL)
1474 if (expr->value.function.esym != NULL
1475 && expr->value.function.esym->attr.elemental)
1477 arg0 = expr->value.function.actual;
1478 esym = expr->value.function.esym;
1480 else if (expr->value.function.isym != NULL
1481 && expr->value.function.isym->elemental)
1483 arg0 = expr->value.function.actual;
1484 isym = expr->value.function.isym;
1489 else if (c && c->ext.actual != NULL)
1491 arg0 = c->ext.actual;
1493 if (c->resolved_sym)
1494 esym = c->resolved_sym;
1496 esym = c->symtree->n.sym;
1499 if (!esym->attr.elemental)
1505 /* The rank of an elemental is the rank of its array argument(s). */
1506 for (arg = arg0; arg; arg = arg->next)
1508 if (arg->expr != NULL && arg->expr->rank > 0)
1510 rank = arg->expr->rank;
1511 if (arg->expr->expr_type == EXPR_VARIABLE
1512 && arg->expr->symtree->n.sym->attr.optional)
1513 set_by_optional = true;
1515 /* Function specific; set the result rank and shape. */
1519 if (!expr->shape && arg->expr->shape)
1521 expr->shape = gfc_get_shape (rank);
1522 for (i = 0; i < rank; i++)
1523 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1530 /* If it is an array, it shall not be supplied as an actual argument
1531 to an elemental procedure unless an array of the same rank is supplied
1532 as an actual argument corresponding to a nonoptional dummy argument of
1533 that elemental procedure(12.4.1.5). */
1534 formal_optional = false;
1536 iformal = isym->formal;
1538 eformal = esym->formal;
1540 for (arg = arg0; arg; arg = arg->next)
1544 if (eformal->sym && eformal->sym->attr.optional)
1545 formal_optional = true;
1546 eformal = eformal->next;
1548 else if (isym && iformal)
1550 if (iformal->optional)
1551 formal_optional = true;
1552 iformal = iformal->next;
1555 formal_optional = true;
1557 if (pedantic && arg->expr != NULL
1558 && arg->expr->expr_type == EXPR_VARIABLE
1559 && arg->expr->symtree->n.sym->attr.optional
1562 && (set_by_optional || arg->expr->rank != rank)
1563 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1565 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1566 "MISSING, it cannot be the actual argument of an "
1567 "ELEMENTAL procedure unless there is a non-optional "
1568 "argument with the same rank (12.4.1.5)",
1569 arg->expr->symtree->n.sym->name, &arg->expr->where);
1574 for (arg = arg0; arg; arg = arg->next)
1576 if (arg->expr == NULL || arg->expr->rank == 0)
1579 /* Being elemental, the last upper bound of an assumed size array
1580 argument must be present. */
1581 if (resolve_assumed_size_actual (arg->expr))
1584 /* Elemental procedure's array actual arguments must conform. */
1587 if (gfc_check_conformance ("elemental procedure", arg->expr, e)
1595 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1596 is an array, the intent inout/out variable needs to be also an array. */
1597 if (rank > 0 && esym && expr == NULL)
1598 for (eformal = esym->formal, arg = arg0; arg && eformal;
1599 arg = arg->next, eformal = eformal->next)
1600 if ((eformal->sym->attr.intent == INTENT_OUT
1601 || eformal->sym->attr.intent == INTENT_INOUT)
1602 && arg->expr && arg->expr->rank == 0)
1604 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1605 "ELEMENTAL subroutine '%s' is a scalar, but another "
1606 "actual argument is an array", &arg->expr->where,
1607 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1608 : "INOUT", eformal->sym->name, esym->name);
1615 /* Go through each actual argument in ACTUAL and see if it can be
1616 implemented as an inlined, non-copying intrinsic. FNSYM is the
1617 function being called, or NULL if not known. */
1620 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1622 gfc_actual_arglist *ap;
1625 for (ap = actual; ap; ap = ap->next)
1627 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1628 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1630 ap->expr->inline_noncopying_intrinsic = 1;
1634 /* This function does the checking of references to global procedures
1635 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1636 77 and 95 standards. It checks for a gsymbol for the name, making
1637 one if it does not already exist. If it already exists, then the
1638 reference being resolved must correspond to the type of gsymbol.
1639 Otherwise, the new symbol is equipped with the attributes of the
1640 reference. The corresponding code that is called in creating
1641 global entities is parse.c.
1643 In addition, for all but -std=legacy, the gsymbols are used to
1644 check the interfaces of external procedures from the same file.
1645 The namespace of the gsymbol is resolved and then, once this is
1646 done the interface is checked. */
1649 resolve_global_procedure (gfc_symbol *sym, locus *where,
1650 gfc_actual_arglist **actual, int sub)
1654 enum gfc_symbol_type type;
1656 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1658 gsym = gfc_get_gsymbol (sym->name);
1660 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1661 gfc_global_used (gsym, where);
1663 if (gfc_option.flag_whole_file
1664 && gsym->type != GSYM_UNKNOWN
1666 && gsym->ns->proc_name)
1668 /* Make sure that translation for the gsymbol occurs before
1669 the procedure currently being resolved. */
1670 ns = gsym->ns->resolved ? NULL : gfc_global_ns_list;
1671 for (; ns && ns != gsym->ns; ns = ns->sibling)
1673 if (ns->sibling == gsym->ns)
1675 ns->sibling = gsym->ns->sibling;
1676 gsym->ns->sibling = gfc_global_ns_list;
1677 gfc_global_ns_list = gsym->ns;
1682 if (!gsym->ns->resolved)
1683 gfc_resolve (gsym->ns);
1685 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1688 if (gsym->type == GSYM_UNKNOWN)
1691 gsym->where = *where;
1698 /************* Function resolution *************/
1700 /* Resolve a function call known to be generic.
1701 Section 14.1.2.4.1. */
1704 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1708 if (sym->attr.generic)
1710 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1713 expr->value.function.name = s->name;
1714 expr->value.function.esym = s;
1716 if (s->ts.type != BT_UNKNOWN)
1718 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1719 expr->ts = s->result->ts;
1722 expr->rank = s->as->rank;
1723 else if (s->result != NULL && s->result->as != NULL)
1724 expr->rank = s->result->as->rank;
1726 gfc_set_sym_referenced (expr->value.function.esym);
1731 /* TODO: Need to search for elemental references in generic
1735 if (sym->attr.intrinsic)
1736 return gfc_intrinsic_func_interface (expr, 0);
1743 resolve_generic_f (gfc_expr *expr)
1748 sym = expr->symtree->n.sym;
1752 m = resolve_generic_f0 (expr, sym);
1755 else if (m == MATCH_ERROR)
1759 if (sym->ns->parent == NULL)
1761 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1765 if (!generic_sym (sym))
1769 /* Last ditch attempt. See if the reference is to an intrinsic
1770 that possesses a matching interface. 14.1.2.4 */
1771 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
1773 gfc_error ("There is no specific function for the generic '%s' at %L",
1774 expr->symtree->n.sym->name, &expr->where);
1778 m = gfc_intrinsic_func_interface (expr, 0);
1782 gfc_error ("Generic function '%s' at %L is not consistent with a "
1783 "specific intrinsic interface", expr->symtree->n.sym->name,
1790 /* Resolve a function call known to be specific. */
1793 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
1797 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
1799 if (sym->attr.dummy)
1801 sym->attr.proc = PROC_DUMMY;
1805 sym->attr.proc = PROC_EXTERNAL;
1809 if (sym->attr.proc == PROC_MODULE
1810 || sym->attr.proc == PROC_ST_FUNCTION
1811 || sym->attr.proc == PROC_INTERNAL)
1814 if (sym->attr.intrinsic)
1816 m = gfc_intrinsic_func_interface (expr, 1);
1820 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
1821 "with an intrinsic", sym->name, &expr->where);
1829 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1832 expr->value.function.name = sym->name;
1833 expr->value.function.esym = sym;
1834 if (sym->as != NULL)
1835 expr->rank = sym->as->rank;
1842 resolve_specific_f (gfc_expr *expr)
1847 sym = expr->symtree->n.sym;
1851 m = resolve_specific_f0 (sym, expr);
1854 if (m == MATCH_ERROR)
1857 if (sym->ns->parent == NULL)
1860 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1866 gfc_error ("Unable to resolve the specific function '%s' at %L",
1867 expr->symtree->n.sym->name, &expr->where);
1873 /* Resolve a procedure call not known to be generic nor specific. */
1876 resolve_unknown_f (gfc_expr *expr)
1881 sym = expr->symtree->n.sym;
1883 if (sym->attr.dummy)
1885 sym->attr.proc = PROC_DUMMY;
1886 expr->value.function.name = sym->name;
1890 /* See if we have an intrinsic function reference. */
1892 if (gfc_is_intrinsic (sym, 0, expr->where))
1894 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
1899 /* The reference is to an external name. */
1901 sym->attr.proc = PROC_EXTERNAL;
1902 expr->value.function.name = sym->name;
1903 expr->value.function.esym = expr->symtree->n.sym;
1905 if (sym->as != NULL)
1906 expr->rank = sym->as->rank;
1908 /* Type of the expression is either the type of the symbol or the
1909 default type of the symbol. */
1912 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1914 if (sym->ts.type != BT_UNKNOWN)
1918 ts = gfc_get_default_type (sym->name, sym->ns);
1920 if (ts->type == BT_UNKNOWN)
1922 gfc_error ("Function '%s' at %L has no IMPLICIT type",
1923 sym->name, &expr->where);
1934 /* Return true, if the symbol is an external procedure. */
1936 is_external_proc (gfc_symbol *sym)
1938 if (!sym->attr.dummy && !sym->attr.contained
1939 && !(sym->attr.intrinsic
1940 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
1941 && sym->attr.proc != PROC_ST_FUNCTION
1942 && !sym->attr.use_assoc
1950 /* Figure out if a function reference is pure or not. Also set the name
1951 of the function for a potential error message. Return nonzero if the
1952 function is PURE, zero if not. */
1954 pure_stmt_function (gfc_expr *, gfc_symbol *);
1957 pure_function (gfc_expr *e, const char **name)
1963 if (e->symtree != NULL
1964 && e->symtree->n.sym != NULL
1965 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
1966 return pure_stmt_function (e, e->symtree->n.sym);
1968 if (e->value.function.esym)
1970 pure = gfc_pure (e->value.function.esym);
1971 *name = e->value.function.esym->name;
1973 else if (e->value.function.isym)
1975 pure = e->value.function.isym->pure
1976 || e->value.function.isym->elemental;
1977 *name = e->value.function.isym->name;
1981 /* Implicit functions are not pure. */
1983 *name = e->value.function.name;
1991 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
1992 int *f ATTRIBUTE_UNUSED)
1996 /* Don't bother recursing into other statement functions
1997 since they will be checked individually for purity. */
1998 if (e->expr_type != EXPR_FUNCTION
2000 || e->symtree->n.sym == sym
2001 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2004 return pure_function (e, &name) ? false : true;
2009 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2011 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2016 is_scalar_expr_ptr (gfc_expr *expr)
2018 gfc_try retval = SUCCESS;
2023 /* See if we have a gfc_ref, which means we have a substring, array
2024 reference, or a component. */
2025 if (expr->ref != NULL)
2028 while (ref->next != NULL)
2034 if (ref->u.ss.length != NULL
2035 && ref->u.ss.length->length != NULL
2037 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2039 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2041 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2042 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2043 if (end - start + 1 != 1)
2050 if (ref->u.ar.type == AR_ELEMENT)
2052 else if (ref->u.ar.type == AR_FULL)
2054 /* The user can give a full array if the array is of size 1. */
2055 if (ref->u.ar.as != NULL
2056 && ref->u.ar.as->rank == 1
2057 && ref->u.ar.as->type == AS_EXPLICIT
2058 && ref->u.ar.as->lower[0] != NULL
2059 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2060 && ref->u.ar.as->upper[0] != NULL
2061 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2063 /* If we have a character string, we need to check if
2064 its length is one. */
2065 if (expr->ts.type == BT_CHARACTER)
2067 if (expr->ts.cl == NULL
2068 || expr->ts.cl->length == NULL
2069 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1)
2075 /* We have constant lower and upper bounds. If the
2076 difference between is 1, it can be considered a
2078 start = (int) mpz_get_si
2079 (ref->u.ar.as->lower[0]->value.integer);
2080 end = (int) mpz_get_si
2081 (ref->u.ar.as->upper[0]->value.integer);
2082 if (end - start + 1 != 1)
2097 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2099 /* Character string. Make sure it's of length 1. */
2100 if (expr->ts.cl == NULL
2101 || expr->ts.cl->length == NULL
2102 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1) != 0)
2105 else if (expr->rank != 0)
2112 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2113 and, in the case of c_associated, set the binding label based on
2117 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2118 gfc_symbol **new_sym)
2120 char name[GFC_MAX_SYMBOL_LEN + 1];
2121 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2122 int optional_arg = 0, is_pointer = 0;
2123 gfc_try retval = SUCCESS;
2124 gfc_symbol *args_sym;
2125 gfc_typespec *arg_ts;
2127 if (args->expr->expr_type == EXPR_CONSTANT
2128 || args->expr->expr_type == EXPR_OP
2129 || args->expr->expr_type == EXPR_NULL)
2131 gfc_error ("Argument to '%s' at %L is not a variable",
2132 sym->name, &(args->expr->where));
2136 args_sym = args->expr->symtree->n.sym;
2138 /* The typespec for the actual arg should be that stored in the expr
2139 and not necessarily that of the expr symbol (args_sym), because
2140 the actual expression could be a part-ref of the expr symbol. */
2141 arg_ts = &(args->expr->ts);
2143 is_pointer = gfc_is_data_pointer (args->expr);
2145 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2147 /* If the user gave two args then they are providing something for
2148 the optional arg (the second cptr). Therefore, set the name and
2149 binding label to the c_associated for two cptrs. Otherwise,
2150 set c_associated to expect one cptr. */
2154 sprintf (name, "%s_2", sym->name);
2155 sprintf (binding_label, "%s_2", sym->binding_label);
2161 sprintf (name, "%s_1", sym->name);
2162 sprintf (binding_label, "%s_1", sym->binding_label);
2166 /* Get a new symbol for the version of c_associated that
2168 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2170 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2171 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2173 sprintf (name, "%s", sym->name);
2174 sprintf (binding_label, "%s", sym->binding_label);
2176 /* Error check the call. */
2177 if (args->next != NULL)
2179 gfc_error_now ("More actual than formal arguments in '%s' "
2180 "call at %L", name, &(args->expr->where));
2183 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2185 /* Make sure we have either the target or pointer attribute. */
2186 if (!args_sym->attr.target && !is_pointer)
2188 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2189 "a TARGET or an associated pointer",
2191 sym->name, &(args->expr->where));
2195 /* See if we have interoperable type and type param. */
2196 if (verify_c_interop (arg_ts) == SUCCESS
2197 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2199 if (args_sym->attr.target == 1)
2201 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2202 has the target attribute and is interoperable. */
2203 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2204 allocatable variable that has the TARGET attribute and
2205 is not an array of zero size. */
2206 if (args_sym->attr.allocatable == 1)
2208 if (args_sym->attr.dimension != 0
2209 && (args_sym->as && args_sym->as->rank == 0))
2211 gfc_error_now ("Allocatable variable '%s' used as a "
2212 "parameter to '%s' at %L must not be "
2213 "an array of zero size",
2214 args_sym->name, sym->name,
2215 &(args->expr->where));
2221 /* A non-allocatable target variable with C
2222 interoperable type and type parameters must be
2224 if (args_sym && args_sym->attr.dimension)
2226 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2228 gfc_error ("Assumed-shape array '%s' at %L "
2229 "cannot be an argument to the "
2230 "procedure '%s' because "
2231 "it is not C interoperable",
2233 &(args->expr->where), sym->name);
2236 else if (args_sym->as->type == AS_DEFERRED)
2238 gfc_error ("Deferred-shape array '%s' at %L "
2239 "cannot be an argument to the "
2240 "procedure '%s' because "
2241 "it is not C interoperable",
2243 &(args->expr->where), sym->name);
2248 /* Make sure it's not a character string. Arrays of
2249 any type should be ok if the variable is of a C
2250 interoperable type. */
2251 if (arg_ts->type == BT_CHARACTER)
2252 if (arg_ts->cl != NULL
2253 && (arg_ts->cl->length == NULL
2254 || arg_ts->cl->length->expr_type
2257 (arg_ts->cl->length->value.integer, 1)
2259 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2261 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2262 "at %L must have a length of 1",
2263 args_sym->name, sym->name,
2264 &(args->expr->where));
2270 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2272 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2274 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2275 "associated scalar POINTER", args_sym->name,
2276 sym->name, &(args->expr->where));
2282 /* The parameter is not required to be C interoperable. If it
2283 is not C interoperable, it must be a nonpolymorphic scalar
2284 with no length type parameters. It still must have either
2285 the pointer or target attribute, and it can be
2286 allocatable (but must be allocated when c_loc is called). */
2287 if (args->expr->rank != 0
2288 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2290 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2291 "scalar", args_sym->name, sym->name,
2292 &(args->expr->where));
2295 else if (arg_ts->type == BT_CHARACTER
2296 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2298 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2299 "%L must have a length of 1",
2300 args_sym->name, sym->name,
2301 &(args->expr->where));
2306 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2308 if (args_sym->attr.flavor != FL_PROCEDURE)
2310 /* TODO: Update this error message to allow for procedure
2311 pointers once they are implemented. */
2312 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2314 args_sym->name, sym->name,
2315 &(args->expr->where));
2318 else if (args_sym->attr.is_bind_c != 1)
2320 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2322 args_sym->name, sym->name,
2323 &(args->expr->where));
2328 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2333 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2334 "iso_c_binding function: '%s'!\n", sym->name);
2341 /* Resolve a function call, which means resolving the arguments, then figuring
2342 out which entity the name refers to. */
2343 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2344 to INTENT(OUT) or INTENT(INOUT). */
2347 resolve_function (gfc_expr *expr)
2349 gfc_actual_arglist *arg;
2354 procedure_type p = PROC_INTRINSIC;
2355 bool no_formal_args;
2359 sym = expr->symtree->n.sym;
2361 if (sym && sym->attr.intrinsic
2362 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2365 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2367 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2371 if (sym && sym->attr.abstract)
2373 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2374 sym->name, &expr->where);
2378 /* Switch off assumed size checking and do this again for certain kinds
2379 of procedure, once the procedure itself is resolved. */
2380 need_full_assumed_size++;
2382 if (expr->symtree && expr->symtree->n.sym)
2383 p = expr->symtree->n.sym->attr.proc;
2385 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2386 if (resolve_actual_arglist (expr->value.function.actual,
2387 p, no_formal_args) == FAILURE)
2390 /* Need to setup the call to the correct c_associated, depending on
2391 the number of cptrs to user gives to compare. */
2392 if (sym && sym->attr.is_iso_c == 1)
2394 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2398 /* Get the symtree for the new symbol (resolved func).
2399 the old one will be freed later, when it's no longer used. */
2400 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2403 /* Resume assumed_size checking. */
2404 need_full_assumed_size--;
2406 /* If the procedure is external, check for usage. */
2407 if (sym && is_external_proc (sym))
2408 resolve_global_procedure (sym, &expr->where,
2409 &expr->value.function.actual, 0);
2411 if (sym && sym->ts.type == BT_CHARACTER
2413 && sym->ts.cl->length == NULL
2415 && expr->value.function.esym == NULL
2416 && !sym->attr.contained)
2418 /* Internal procedures are taken care of in resolve_contained_fntype. */
2419 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2420 "be used at %L since it is not a dummy argument",
2421 sym->name, &expr->where);
2425 /* See if function is already resolved. */
2427 if (expr->value.function.name != NULL)
2429 if (expr->ts.type == BT_UNKNOWN)
2435 /* Apply the rules of section 14.1.2. */
2437 switch (procedure_kind (sym))
2440 t = resolve_generic_f (expr);
2443 case PTYPE_SPECIFIC:
2444 t = resolve_specific_f (expr);
2448 t = resolve_unknown_f (expr);
2452 gfc_internal_error ("resolve_function(): bad function type");
2456 /* If the expression is still a function (it might have simplified),
2457 then we check to see if we are calling an elemental function. */
2459 if (expr->expr_type != EXPR_FUNCTION)
2462 temp = need_full_assumed_size;
2463 need_full_assumed_size = 0;
2465 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2468 if (omp_workshare_flag
2469 && expr->value.function.esym
2470 && ! gfc_elemental (expr->value.function.esym))
2472 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2473 "in WORKSHARE construct", expr->value.function.esym->name,
2478 #define GENERIC_ID expr->value.function.isym->id
2479 else if (expr->value.function.actual != NULL
2480 && expr->value.function.isym != NULL
2481 && GENERIC_ID != GFC_ISYM_LBOUND
2482 && GENERIC_ID != GFC_ISYM_LEN
2483 && GENERIC_ID != GFC_ISYM_LOC
2484 && GENERIC_ID != GFC_ISYM_PRESENT)
2486 /* Array intrinsics must also have the last upper bound of an
2487 assumed size array argument. UBOUND and SIZE have to be
2488 excluded from the check if the second argument is anything
2491 for (arg = expr->value.function.actual; arg; arg = arg->next)
2493 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2494 && arg->next != NULL && arg->next->expr)
2496 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2499 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2502 if ((int)mpz_get_si (arg->next->expr->value.integer)
2507 if (arg->expr != NULL
2508 && arg->expr->rank > 0
2509 && resolve_assumed_size_actual (arg->expr))
2515 need_full_assumed_size = temp;
2518 if (!pure_function (expr, &name) && name)
2522 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2523 "FORALL %s", name, &expr->where,
2524 forall_flag == 2 ? "mask" : "block");
2527 else if (gfc_pure (NULL))
2529 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2530 "procedure within a PURE procedure", name, &expr->where);
2535 /* Functions without the RECURSIVE attribution are not allowed to
2536 * call themselves. */
2537 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2540 esym = expr->value.function.esym;
2542 if (is_illegal_recursion (esym, gfc_current_ns))
2544 if (esym->attr.entry && esym->ns->entries)
2545 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2546 " function '%s' is not RECURSIVE",
2547 esym->name, &expr->where, esym->ns->entries->sym->name);
2549 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2550 " is not RECURSIVE", esym->name, &expr->where);
2556 /* Character lengths of use associated functions may contains references to
2557 symbols not referenced from the current program unit otherwise. Make sure
2558 those symbols are marked as referenced. */
2560 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2561 && expr->value.function.esym->attr.use_assoc)
2563 gfc_expr_set_symbols_referenced (expr->ts.cl->length);
2567 && !((expr->value.function.esym
2568 && expr->value.function.esym->attr.elemental)
2570 (expr->value.function.isym
2571 && expr->value.function.isym->elemental)))
2572 find_noncopying_intrinsics (expr->value.function.esym,
2573 expr->value.function.actual);
2575 /* Make sure that the expression has a typespec that works. */
2576 if (expr->ts.type == BT_UNKNOWN)
2578 if (expr->symtree->n.sym->result
2579 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2580 && !expr->symtree->n.sym->result->attr.proc_pointer)
2581 expr->ts = expr->symtree->n.sym->result->ts;
2588 /************* Subroutine resolution *************/
2591 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2597 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2598 sym->name, &c->loc);
2599 else if (gfc_pure (NULL))
2600 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2606 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2610 if (sym->attr.generic)
2612 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2615 c->resolved_sym = s;
2616 pure_subroutine (c, s);
2620 /* TODO: Need to search for elemental references in generic interface. */
2623 if (sym->attr.intrinsic)
2624 return gfc_intrinsic_sub_interface (c, 0);
2631 resolve_generic_s (gfc_code *c)
2636 sym = c->symtree->n.sym;
2640 m = resolve_generic_s0 (c, sym);
2643 else if (m == MATCH_ERROR)
2647 if (sym->ns->parent == NULL)
2649 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2653 if (!generic_sym (sym))
2657 /* Last ditch attempt. See if the reference is to an intrinsic
2658 that possesses a matching interface. 14.1.2.4 */
2659 sym = c->symtree->n.sym;
2661 if (!gfc_is_intrinsic (sym, 1, c->loc))
2663 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2664 sym->name, &c->loc);
2668 m = gfc_intrinsic_sub_interface (c, 0);
2672 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2673 "intrinsic subroutine interface", sym->name, &c->loc);
2679 /* Set the name and binding label of the subroutine symbol in the call
2680 expression represented by 'c' to include the type and kind of the
2681 second parameter. This function is for resolving the appropriate
2682 version of c_f_pointer() and c_f_procpointer(). For example, a
2683 call to c_f_pointer() for a default integer pointer could have a
2684 name of c_f_pointer_i4. If no second arg exists, which is an error
2685 for these two functions, it defaults to the generic symbol's name
2686 and binding label. */
2689 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2690 char *name, char *binding_label)
2692 gfc_expr *arg = NULL;
2696 /* The second arg of c_f_pointer and c_f_procpointer determines
2697 the type and kind for the procedure name. */
2698 arg = c->ext.actual->next->expr;
2702 /* Set up the name to have the given symbol's name,
2703 plus the type and kind. */
2704 /* a derived type is marked with the type letter 'u' */
2705 if (arg->ts.type == BT_DERIVED)
2708 kind = 0; /* set the kind as 0 for now */
2712 type = gfc_type_letter (arg->ts.type);
2713 kind = arg->ts.kind;
2716 if (arg->ts.type == BT_CHARACTER)
2717 /* Kind info for character strings not needed. */
2720 sprintf (name, "%s_%c%d", sym->name, type, kind);
2721 /* Set up the binding label as the given symbol's label plus
2722 the type and kind. */
2723 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2727 /* If the second arg is missing, set the name and label as
2728 was, cause it should at least be found, and the missing
2729 arg error will be caught by compare_parameters(). */
2730 sprintf (name, "%s", sym->name);
2731 sprintf (binding_label, "%s", sym->binding_label);
2738 /* Resolve a generic version of the iso_c_binding procedure given
2739 (sym) to the specific one based on the type and kind of the
2740 argument(s). Currently, this function resolves c_f_pointer() and
2741 c_f_procpointer based on the type and kind of the second argument
2742 (FPTR). Other iso_c_binding procedures aren't specially handled.
2743 Upon successfully exiting, c->resolved_sym will hold the resolved
2744 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2748 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2750 gfc_symbol *new_sym;
2751 /* this is fine, since we know the names won't use the max */
2752 char name[GFC_MAX_SYMBOL_LEN + 1];
2753 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2754 /* default to success; will override if find error */
2755 match m = MATCH_YES;
2757 /* Make sure the actual arguments are in the necessary order (based on the
2758 formal args) before resolving. */
2759 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2761 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2762 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2764 set_name_and_label (c, sym, name, binding_label);
2766 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2768 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
2770 /* Make sure we got a third arg if the second arg has non-zero
2771 rank. We must also check that the type and rank are
2772 correct since we short-circuit this check in
2773 gfc_procedure_use() (called above to sort actual args). */
2774 if (c->ext.actual->next->expr->rank != 0)
2776 if(c->ext.actual->next->next == NULL
2777 || c->ext.actual->next->next->expr == NULL)
2780 gfc_error ("Missing SHAPE parameter for call to %s "
2781 "at %L", sym->name, &(c->loc));
2783 else if (c->ext.actual->next->next->expr->ts.type
2785 || c->ext.actual->next->next->expr->rank != 1)
2788 gfc_error ("SHAPE parameter for call to %s at %L must "
2789 "be a rank 1 INTEGER array", sym->name,
2796 if (m != MATCH_ERROR)
2798 /* the 1 means to add the optional arg to formal list */
2799 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
2801 /* for error reporting, say it's declared where the original was */
2802 new_sym->declared_at = sym->declared_at;
2807 /* no differences for c_loc or c_funloc */
2811 /* set the resolved symbol */
2812 if (m != MATCH_ERROR)
2813 c->resolved_sym = new_sym;
2815 c->resolved_sym = sym;
2821 /* Resolve a subroutine call known to be specific. */
2824 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
2828 if(sym->attr.is_iso_c)
2830 m = gfc_iso_c_sub_interface (c,sym);
2834 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2836 if (sym->attr.dummy)
2838 sym->attr.proc = PROC_DUMMY;
2842 sym->attr.proc = PROC_EXTERNAL;
2846 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
2849 if (sym->attr.intrinsic)
2851 m = gfc_intrinsic_sub_interface (c, 1);
2855 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
2856 "with an intrinsic", sym->name, &c->loc);
2864 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2866 c->resolved_sym = sym;
2867 pure_subroutine (c, sym);
2874 resolve_specific_s (gfc_code *c)
2879 sym = c->symtree->n.sym;
2883 m = resolve_specific_s0 (c, sym);
2886 if (m == MATCH_ERROR)
2889 if (sym->ns->parent == NULL)
2892 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2898 sym = c->symtree->n.sym;
2899 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
2900 sym->name, &c->loc);
2906 /* Resolve a subroutine call not known to be generic nor specific. */
2909 resolve_unknown_s (gfc_code *c)
2913 sym = c->symtree->n.sym;
2915 if (sym->attr.dummy)
2917 sym->attr.proc = PROC_DUMMY;
2921 /* See if we have an intrinsic function reference. */
2923 if (gfc_is_intrinsic (sym, 1, c->loc))
2925 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
2930 /* The reference is to an external name. */
2933 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2935 c->resolved_sym = sym;
2937 pure_subroutine (c, sym);
2943 /* Resolve a subroutine call. Although it was tempting to use the same code
2944 for functions, subroutines and functions are stored differently and this
2945 makes things awkward. */
2948 resolve_call (gfc_code *c)
2951 procedure_type ptype = PROC_INTRINSIC;
2952 gfc_symbol *csym, *sym;
2953 bool no_formal_args;
2955 csym = c->symtree ? c->symtree->n.sym : NULL;
2957 if (csym && csym->ts.type != BT_UNKNOWN)
2959 gfc_error ("'%s' at %L has a type, which is not consistent with "
2960 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
2964 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
2967 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
2968 sym = st ? st->n.sym : NULL;
2969 if (sym && csym != sym
2970 && sym->ns == gfc_current_ns
2971 && sym->attr.flavor == FL_PROCEDURE
2972 && sym->attr.contained)
2975 if (csym->attr.generic)
2976 c->symtree->n.sym = sym;
2979 csym = c->symtree->n.sym;
2983 /* Subroutines without the RECURSIVE attribution are not allowed to
2984 * call themselves. */
2985 if (csym && is_illegal_recursion (csym, gfc_current_ns))
2987 if (csym->attr.entry && csym->ns->entries)
2988 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2989 " subroutine '%s' is not RECURSIVE",
2990 csym->name, &c->loc, csym->ns->entries->sym->name);
2992 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
2993 " is not RECURSIVE", csym->name, &c->loc);
2998 /* Switch off assumed size checking and do this again for certain kinds
2999 of procedure, once the procedure itself is resolved. */
3000 need_full_assumed_size++;
3003 ptype = csym->attr.proc;
3005 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3006 if (resolve_actual_arglist (c->ext.actual, ptype,
3007 no_formal_args) == FAILURE)
3010 /* Resume assumed_size checking. */
3011 need_full_assumed_size--;
3013 /* If external, check for usage. */
3014 if (csym && is_external_proc (csym))
3015 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3018 if (c->resolved_sym == NULL)
3020 c->resolved_isym = NULL;
3021 switch (procedure_kind (csym))
3024 t = resolve_generic_s (c);
3027 case PTYPE_SPECIFIC:
3028 t = resolve_specific_s (c);
3032 t = resolve_unknown_s (c);
3036 gfc_internal_error ("resolve_subroutine(): bad function type");
3040 /* Some checks of elemental subroutine actual arguments. */
3041 if (resolve_elemental_actual (NULL, c) == FAILURE)
3044 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3045 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3050 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3051 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3052 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3053 if their shapes do not match. If either op1->shape or op2->shape is
3054 NULL, return SUCCESS. */
3057 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3064 if (op1->shape != NULL && op2->shape != NULL)
3066 for (i = 0; i < op1->rank; i++)
3068 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3070 gfc_error ("Shapes for operands at %L and %L are not conformable",
3071 &op1->where, &op2->where);
3082 /* Resolve an operator expression node. This can involve replacing the
3083 operation with a user defined function call. */
3086 resolve_operator (gfc_expr *e)
3088 gfc_expr *op1, *op2;
3090 bool dual_locus_error;
3093 /* Resolve all subnodes-- give them types. */
3095 switch (e->value.op.op)
3098 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3101 /* Fall through... */
3104 case INTRINSIC_UPLUS:
3105 case INTRINSIC_UMINUS:
3106 case INTRINSIC_PARENTHESES:
3107 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3112 /* Typecheck the new node. */
3114 op1 = e->value.op.op1;
3115 op2 = e->value.op.op2;
3116 dual_locus_error = false;
3118 if ((op1 && op1->expr_type == EXPR_NULL)
3119 || (op2 && op2->expr_type == EXPR_NULL))
3121 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3125 switch (e->value.op.op)
3127 case INTRINSIC_UPLUS:
3128 case INTRINSIC_UMINUS:
3129 if (op1->ts.type == BT_INTEGER
3130 || op1->ts.type == BT_REAL
3131 || op1->ts.type == BT_COMPLEX)
3137 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3138 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3141 case INTRINSIC_PLUS:
3142 case INTRINSIC_MINUS:
3143 case INTRINSIC_TIMES:
3144 case INTRINSIC_DIVIDE:
3145 case INTRINSIC_POWER:
3146 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3148 gfc_type_convert_binary (e);
3153 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3154 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3155 gfc_typename (&op2->ts));
3158 case INTRINSIC_CONCAT:
3159 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3160 && op1->ts.kind == op2->ts.kind)
3162 e->ts.type = BT_CHARACTER;
3163 e->ts.kind = op1->ts.kind;
3168 _("Operands of string concatenation operator at %%L are %s/%s"),
3169 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3175 case INTRINSIC_NEQV:
3176 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3178 e->ts.type = BT_LOGICAL;
3179 e->ts.kind = gfc_kind_max (op1, op2);
3180 if (op1->ts.kind < e->ts.kind)
3181 gfc_convert_type (op1, &e->ts, 2);
3182 else if (op2->ts.kind < e->ts.kind)
3183 gfc_convert_type (op2, &e->ts, 2);
3187 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3188 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3189 gfc_typename (&op2->ts));
3194 if (op1->ts.type == BT_LOGICAL)
3196 e->ts.type = BT_LOGICAL;
3197 e->ts.kind = op1->ts.kind;
3201 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3202 gfc_typename (&op1->ts));
3206 case INTRINSIC_GT_OS:
3208 case INTRINSIC_GE_OS:
3210 case INTRINSIC_LT_OS:
3212 case INTRINSIC_LE_OS:
3213 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3215 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3219 /* Fall through... */
3222 case INTRINSIC_EQ_OS:
3224 case INTRINSIC_NE_OS:
3225 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3226 && op1->ts.kind == op2->ts.kind)
3228 e->ts.type = BT_LOGICAL;
3229 e->ts.kind = gfc_default_logical_kind;
3233 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3235 gfc_type_convert_binary (e);
3237 e->ts.type = BT_LOGICAL;
3238 e->ts.kind = gfc_default_logical_kind;
3242 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3244 _("Logicals at %%L must be compared with %s instead of %s"),
3245 (e->value.op.op == INTRINSIC_EQ
3246 || e->value.op.op == INTRINSIC_EQ_OS)
3247 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3250 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3251 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3252 gfc_typename (&op2->ts));
3256 case INTRINSIC_USER:
3257 if (e->value.op.uop->op == NULL)
3258 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3259 else if (op2 == NULL)
3260 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3261 e->value.op.uop->name, gfc_typename (&op1->ts));
3263 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3264 e->value.op.uop->name, gfc_typename (&op1->ts),
3265 gfc_typename (&op2->ts));
3269 case INTRINSIC_PARENTHESES:
3271 if (e->ts.type == BT_CHARACTER)
3272 e->ts.cl = op1->ts.cl;
3276 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3279 /* Deal with arrayness of an operand through an operator. */
3283 switch (e->value.op.op)
3285 case INTRINSIC_PLUS:
3286 case INTRINSIC_MINUS:
3287 case INTRINSIC_TIMES:
3288 case INTRINSIC_DIVIDE:
3289 case INTRINSIC_POWER:
3290 case INTRINSIC_CONCAT:
3294 case INTRINSIC_NEQV:
3296 case INTRINSIC_EQ_OS:
3298 case INTRINSIC_NE_OS:
3300 case INTRINSIC_GT_OS:
3302 case INTRINSIC_GE_OS:
3304 case INTRINSIC_LT_OS:
3306 case INTRINSIC_LE_OS:
3308 if (op1->rank == 0 && op2->rank == 0)
3311 if (op1->rank == 0 && op2->rank != 0)
3313 e->rank = op2->rank;
3315 if (e->shape == NULL)
3316 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3319 if (op1->rank != 0 && op2->rank == 0)
3321 e->rank = op1->rank;
3323 if (e->shape == NULL)
3324 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3327 if (op1->rank != 0 && op2->rank != 0)
3329 if (op1->rank == op2->rank)
3331 e->rank = op1->rank;
3332 if (e->shape == NULL)
3334 t = compare_shapes(op1, op2);
3338 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3343 /* Allow higher level expressions to work. */
3346 /* Try user-defined operators, and otherwise throw an error. */
3347 dual_locus_error = true;
3349 _("Inconsistent ranks for operator at %%L and %%L"));
3356 case INTRINSIC_PARENTHESES:
3358 case INTRINSIC_UPLUS:
3359 case INTRINSIC_UMINUS:
3360 /* Simply copy arrayness attribute */
3361 e->rank = op1->rank;
3363 if (e->shape == NULL)
3364 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3372 /* Attempt to simplify the expression. */
3375 t = gfc_simplify_expr (e, 0);
3376 /* Some calls do not succeed in simplification and return FAILURE
3377 even though there is no error; e.g. variable references to
3378 PARAMETER arrays. */
3379 if (!gfc_is_constant_expr (e))
3386 if (gfc_extend_expr (e) == SUCCESS)
3389 if (dual_locus_error)
3390 gfc_error (msg, &op1->where, &op2->where);
3392 gfc_error (msg, &e->where);
3398 /************** Array resolution subroutines **************/
3401 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3404 /* Compare two integer expressions. */
3407 compare_bound (gfc_expr *a, gfc_expr *b)
3411 if (a == NULL || a->expr_type != EXPR_CONSTANT
3412 || b == NULL || b->expr_type != EXPR_CONSTANT)
3415 /* If either of the types isn't INTEGER, we must have
3416 raised an error earlier. */
3418 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3421 i = mpz_cmp (a->value.integer, b->value.integer);
3431 /* Compare an integer expression with an integer. */
3434 compare_bound_int (gfc_expr *a, int b)
3438 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3441 if (a->ts.type != BT_INTEGER)
3442 gfc_internal_error ("compare_bound_int(): Bad expression");
3444 i = mpz_cmp_si (a->value.integer, b);
3454 /* Compare an integer expression with a mpz_t. */
3457 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3461 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3464 if (a->ts.type != BT_INTEGER)
3465 gfc_internal_error ("compare_bound_int(): Bad expression");
3467 i = mpz_cmp (a->value.integer, b);
3477 /* Compute the last value of a sequence given by a triplet.
3478 Return 0 if it wasn't able to compute the last value, or if the
3479 sequence if empty, and 1 otherwise. */
3482 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3483 gfc_expr *stride, mpz_t last)
3487 if (start == NULL || start->expr_type != EXPR_CONSTANT
3488 || end == NULL || end->expr_type != EXPR_CONSTANT
3489 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3492 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3493 || (stride != NULL && stride->ts.type != BT_INTEGER))
3496 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3498 if (compare_bound (start, end) == CMP_GT)
3500 mpz_set (last, end->value.integer);
3504 if (compare_bound_int (stride, 0) == CMP_GT)
3506 /* Stride is positive */
3507 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3512 /* Stride is negative */
3513 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3518 mpz_sub (rem, end->value.integer, start->value.integer);
3519 mpz_tdiv_r (rem, rem, stride->value.integer);
3520 mpz_sub (last, end->value.integer, rem);
3527 /* Compare a single dimension of an array reference to the array
3531 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3535 /* Given start, end and stride values, calculate the minimum and
3536 maximum referenced indexes. */
3538 switch (ar->dimen_type[i])
3544 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3546 gfc_warning ("Array reference at %L is out of bounds "
3547 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3548 mpz_get_si (ar->start[i]->value.integer),
3549 mpz_get_si (as->lower[i]->value.integer), i+1);
3552 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3554 gfc_warning ("Array reference at %L is out of bounds "
3555 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3556 mpz_get_si (ar->start[i]->value.integer),
3557 mpz_get_si (as->upper[i]->value.integer), i+1);
3565 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3566 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3568 comparison comp_start_end = compare_bound (AR_START, AR_END);
3570 /* Check for zero stride, which is not allowed. */
3571 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3573 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3577 /* if start == len || (stride > 0 && start < len)
3578 || (stride < 0 && start > len),
3579 then the array section contains at least one element. In this
3580 case, there is an out-of-bounds access if
3581 (start < lower || start > upper). */
3582 if (compare_bound (AR_START, AR_END) == CMP_EQ
3583 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3584 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3585 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3586 && comp_start_end == CMP_GT))
3588 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3590 gfc_warning ("Lower array reference at %L is out of bounds "
3591 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3592 mpz_get_si (AR_START->value.integer),
3593 mpz_get_si (as->lower[i]->value.integer), i+1);
3596 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3598 gfc_warning ("Lower array reference at %L is out of bounds "
3599 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3600 mpz_get_si (AR_START->value.integer),
3601 mpz_get_si (as->upper[i]->value.integer), i+1);
3606 /* If we can compute the highest index of the array section,
3607 then it also has to be between lower and upper. */
3608 mpz_init (last_value);
3609 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3612 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3614 gfc_warning ("Upper array reference at %L is out of bounds "
3615 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3616 mpz_get_si (last_value),
3617 mpz_get_si (as->lower[i]->value.integer), i+1);
3618 mpz_clear (last_value);
3621 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3623 gfc_warning ("Upper array reference at %L is out of bounds "
3624 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3625 mpz_get_si (last_value),
3626 mpz_get_si (as->upper[i]->value.integer), i+1);
3627 mpz_clear (last_value);
3631 mpz_clear (last_value);
3639 gfc_internal_error ("check_dimension(): Bad array reference");
3646 /* Compare an array reference with an array specification. */
3649 compare_spec_to_ref (gfc_array_ref *ar)
3656 /* TODO: Full array sections are only allowed as actual parameters. */
3657 if (as->type == AS_ASSUMED_SIZE
3658 && (/*ar->type == AR_FULL
3659 ||*/ (ar->type == AR_SECTION
3660 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3662 gfc_error ("Rightmost upper bound of assumed size array section "
3663 "not specified at %L", &ar->where);
3667 if (ar->type == AR_FULL)
3670 if (as->rank != ar->dimen)
3672 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3673 &ar->where, ar->dimen, as->rank);
3677 for (i = 0; i < as->rank; i++)
3678 if (check_dimension (i, ar, as) == FAILURE)
3685 /* Resolve one part of an array index. */
3688 gfc_resolve_index (gfc_expr *index, int check_scalar)
3695 if (gfc_resolve_expr (index) == FAILURE)
3698 if (check_scalar && index->rank != 0)
3700 gfc_error ("Array index at %L must be scalar", &index->where);
3704 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
3706 gfc_error ("Array index at %L must be of INTEGER type, found %s",
3707 &index->where, gfc_basic_typename (index->ts.type));
3711 if (index->ts.type == BT_REAL)
3712 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
3713 &index->where) == FAILURE)
3716 if (index->ts.kind != gfc_index_integer_kind
3717 || index->ts.type != BT_INTEGER)
3720 ts.type = BT_INTEGER;
3721 ts.kind = gfc_index_integer_kind;
3723 gfc_convert_type_warn (index, &ts, 2, 0);
3729 /* Resolve a dim argument to an intrinsic function. */
3732 gfc_resolve_dim_arg (gfc_expr *dim)
3737 if (gfc_resolve_expr (dim) == FAILURE)
3742 gfc_error ("Argument dim at %L must be scalar", &dim->where);
3747 if (dim->ts.type != BT_INTEGER)
3749 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
3753 if (dim->ts.kind != gfc_index_integer_kind)
3757 ts.type = BT_INTEGER;
3758 ts.kind = gfc_index_integer_kind;
3760 gfc_convert_type_warn (dim, &ts, 2, 0);
3766 /* Given an expression that contains array references, update those array
3767 references to point to the right array specifications. While this is
3768 filled in during matching, this information is difficult to save and load
3769 in a module, so we take care of it here.
3771 The idea here is that the original array reference comes from the
3772 base symbol. We traverse the list of reference structures, setting
3773 the stored reference to references. Component references can
3774 provide an additional array specification. */
3777 find_array_spec (gfc_expr *e)
3781 gfc_symbol *derived;
3784 as = e->symtree->n.sym->as;
3787 for (ref = e->ref; ref; ref = ref->next)
3792 gfc_internal_error ("find_array_spec(): Missing spec");
3799 if (derived == NULL)
3800 derived = e->symtree->n.sym->ts.derived;
3802 c = derived->components;
3804 for (; c; c = c->next)
3805 if (c == ref->u.c.component)
3807 /* Track the sequence of component references. */
3808 if (c->ts.type == BT_DERIVED)
3809 derived = c->ts.derived;
3814 gfc_internal_error ("find_array_spec(): Component not found");
3816 if (c->attr.dimension)
3819 gfc_internal_error ("find_array_spec(): unused as(1)");
3830 gfc_internal_error ("find_array_spec(): unused as(2)");
3834 /* Resolve an array reference. */
3837 resolve_array_ref (gfc_array_ref *ar)
3839 int i, check_scalar;
3842 for (i = 0; i < ar->dimen; i++)
3844 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
3846 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
3848 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
3850 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
3855 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
3859 ar->dimen_type[i] = DIMEN_ELEMENT;
3863 ar->dimen_type[i] = DIMEN_VECTOR;
3864 if (e->expr_type == EXPR_VARIABLE
3865 && e->symtree->n.sym->ts.type == BT_DERIVED)
3866 ar->start[i] = gfc_get_parentheses (e);
3870 gfc_error ("Array index at %L is an array of rank %d",
3871 &ar->c_where[i], e->rank);
3876 /* If the reference type is unknown, figure out what kind it is. */
3878 if (ar->type == AR_UNKNOWN)
3880 ar->type = AR_ELEMENT;
3881 for (i = 0; i < ar->dimen; i++)
3882 if (ar->dimen_type[i] == DIMEN_RANGE
3883 || ar->dimen_type[i] == DIMEN_VECTOR)
3885 ar->type = AR_SECTION;
3890 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
3898 resolve_substring (gfc_ref *ref)
3900 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
3902 if (ref->u.ss.start != NULL)
3904 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
3907 if (ref->u.ss.start->ts.type != BT_INTEGER)
3909 gfc_error ("Substring start index at %L must be of type INTEGER",
3910 &ref->u.ss.start->where);
3914 if (ref->u.ss.start->rank != 0)
3916 gfc_error ("Substring start index at %L must be scalar",
3917 &ref->u.ss.start->where);
3921 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
3922 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3923 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3925 gfc_error ("Substring start index at %L is less than one",
3926 &ref->u.ss.start->where);
3931 if (ref->u.ss.end != NULL)
3933 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
3936 if (ref->u.ss.end->ts.type != BT_INTEGER)
3938 gfc_error ("Substring end index at %L must be of type INTEGER",
3939 &ref->u.ss.end->where);
3943 if (ref->u.ss.end->rank != 0)
3945 gfc_error ("Substring end index at %L must be scalar",
3946 &ref->u.ss.end->where);
3950 if (ref->u.ss.length != NULL
3951 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
3952 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3953 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3955 gfc_error ("Substring end index at %L exceeds the string length",
3956 &ref->u.ss.start->where);
3960 if (compare_bound_mpz_t (ref->u.ss.end,
3961 gfc_integer_kinds[k].huge) == CMP_GT
3962 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3963 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3965 gfc_error ("Substring end index at %L is too large",
3966 &ref->u.ss.end->where);
3975 /* This function supplies missing substring charlens. */
3978 gfc_resolve_substring_charlen (gfc_expr *e)
3981 gfc_expr *start, *end;
3983 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
3984 if (char_ref->type == REF_SUBSTRING)
3990 gcc_assert (char_ref->next == NULL);
3994 if (e->ts.cl->length)
3995 gfc_free_expr (e->ts.cl->length);
3996 else if (e->expr_type == EXPR_VARIABLE
3997 && e->symtree->n.sym->attr.dummy)
4001 e->ts.type = BT_CHARACTER;
4002 e->ts.kind = gfc_default_character_kind;
4006 e->ts.cl = gfc_get_charlen ();
4007 e->ts.cl->next = gfc_current_ns->cl_list;
4008 gfc_current_ns->cl_list = e->ts.cl;
4011 if (char_ref->u.ss.start)
4012 start = gfc_copy_expr (char_ref->u.ss.start);
4014 start = gfc_int_expr (1);
4016 if (char_ref->u.ss.end)
4017 end = gfc_copy_expr (char_ref->u.ss.end);
4018 else if (e->expr_type == EXPR_VARIABLE)
4019 end = gfc_copy_expr (e->symtree->n.sym->ts.cl->length);
4026 /* Length = (end - start +1). */
4027 e->ts.cl->length = gfc_subtract (end, start);
4028 e->ts.cl->length = gfc_add (e->ts.cl->length, gfc_int_expr (1));
4030 e->ts.cl->length->ts.type = BT_INTEGER;
4031 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;
4033 /* Make sure that the length is simplified. */
4034 gfc_simplify_expr (e->ts.cl->length, 1);
4035 gfc_resolve_expr (e->ts.cl->length);
4039 /* Resolve subtype references. */
4042 resolve_ref (gfc_expr *expr)
4044 int current_part_dimension, n_components, seen_part_dimension;
4047 for (ref = expr->ref; ref; ref = ref->next)
4048 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4050 find_array_spec (expr);
4054 for (ref = expr->ref; ref; ref = ref->next)
4058 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4066 resolve_substring (ref);
4070 /* Check constraints on part references. */
4072 current_part_dimension = 0;
4073 seen_part_dimension = 0;
4076 for (ref = expr->ref; ref; ref = ref->next)
4081 switch (ref->u.ar.type)
4085 current_part_dimension = 1;
4089 current_part_dimension = 0;
4093 gfc_internal_error ("resolve_ref(): Bad array reference");
4099 if (current_part_dimension || seen_part_dimension)
4101 if (ref->u.c.component->attr.pointer)
4103 gfc_error ("Component to the right of a part reference "
4104 "with nonzero rank must not have the POINTER "
4105 "attribute at %L", &expr->where);
4108 else if (ref->u.c.component->attr.allocatable)
4110 gfc_error ("Component to the right of a part reference "
4111 "with nonzero rank must not have the ALLOCATABLE "
4112 "attribute at %L", &expr->where);
4124 if (((ref->type == REF_COMPONENT && n_components > 1)
4125 || ref->next == NULL)
4126 && current_part_dimension
4127 && seen_part_dimension)
4129 gfc_error ("Two or more part references with nonzero rank must "
4130 "not be specified at %L", &expr->where);
4134 if (ref->type == REF_COMPONENT)
4136 if (current_part_dimension)
4137 seen_part_dimension = 1;
4139 /* reset to make sure */
4140 current_part_dimension = 0;
4148 /* Given an expression, determine its shape. This is easier than it sounds.
4149 Leaves the shape array NULL if it is not possible to determine the shape. */
4152 expression_shape (gfc_expr *e)
4154 mpz_t array[GFC_MAX_DIMENSIONS];
4157 if (e->rank == 0 || e->shape != NULL)
4160 for (i = 0; i < e->rank; i++)
4161 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4164 e->shape = gfc_get_shape (e->rank);
4166 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4171 for (i--; i >= 0; i--)
4172 mpz_clear (array[i]);
4176 /* Given a variable expression node, compute the rank of the expression by
4177 examining the base symbol and any reference structures it may have. */
4180 expression_rank (gfc_expr *e)
4185 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4186 could lead to serious confusion... */
4187 gcc_assert (e->expr_type != EXPR_COMPCALL);
4191 if (e->expr_type == EXPR_ARRAY)
4193 /* Constructors can have a rank different from one via RESHAPE(). */
4195 if (e->symtree == NULL)
4201 e->rank = (e->symtree->n.sym->as == NULL)
4202 ? 0 : e->symtree->n.sym->as->rank;
4208 for (ref = e->ref; ref; ref = ref->next)
4210 if (ref->type != REF_ARRAY)
4213 if (ref->u.ar.type == AR_FULL)
4215 rank = ref->u.ar.as->rank;
4219 if (ref->u.ar.type == AR_SECTION)
4221 /* Figure out the rank of the section. */
4223 gfc_internal_error ("expression_rank(): Two array specs");
4225 for (i = 0; i < ref->u.ar.dimen; i++)
4226 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4227 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4237 expression_shape (e);
4241 /* Resolve a variable expression. */
4244 resolve_variable (gfc_expr *e)
4251 if (e->symtree == NULL)
4254 if (e->ref && resolve_ref (e) == FAILURE)
4257 sym = e->symtree->n.sym;
4258 if (sym->attr.flavor == FL_PROCEDURE
4259 && (!sym->attr.function
4260 || (sym->attr.function && sym->result
4261 && sym->result->attr.proc_pointer
4262 && !sym->result->attr.function)))
4264 e->ts.type = BT_PROCEDURE;
4265 goto resolve_procedure;
4268 if (sym->ts.type != BT_UNKNOWN)
4269 gfc_variable_attr (e, &e->ts);
4272 /* Must be a simple variable reference. */
4273 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4278 if (check_assumed_size_reference (sym, e))
4281 /* Deal with forward references to entries during resolve_code, to
4282 satisfy, at least partially, 12.5.2.5. */
4283 if (gfc_current_ns->entries
4284 && current_entry_id == sym->entry_id
4287 && cs_base->current->op != EXEC_ENTRY)
4289 gfc_entry_list *entry;
4290 gfc_formal_arglist *formal;
4294 /* If the symbol is a dummy... */
4295 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4297 entry = gfc_current_ns->entries;
4300 /* ...test if the symbol is a parameter of previous entries. */
4301 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4302 for (formal = entry->sym->formal; formal; formal = formal->next)
4304 if (formal->sym && sym->name == formal->sym->name)
4308 /* If it has not been seen as a dummy, this is an error. */
4311 if (specification_expr)
4312 gfc_error ("Variable '%s', used in a specification expression"
4313 ", is referenced at %L before the ENTRY statement "
4314 "in which it is a parameter",
4315 sym->name, &cs_base->current->loc);
4317 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4318 "statement in which it is a parameter",
4319 sym->name, &cs_base->current->loc);
4324 /* Now do the same check on the specification expressions. */
4325 specification_expr = 1;
4326 if (sym->ts.type == BT_CHARACTER
4327 && gfc_resolve_expr (sym->ts.cl->length) == FAILURE)
4331 for (n = 0; n < sym->as->rank; n++)
4333 specification_expr = 1;
4334 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4336 specification_expr = 1;
4337 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4340 specification_expr = 0;
4343 /* Update the symbol's entry level. */
4344 sym->entry_id = current_entry_id + 1;
4348 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4355 /* Checks to see that the correct symbol has been host associated.
4356 The only situation where this arises is that in which a twice
4357 contained function is parsed after the host association is made.
4358 Therefore, on detecting this, change the symbol in the expression
4359 and convert the array reference into an actual arglist if the old
4360 symbol is a variable. */
4362 check_host_association (gfc_expr *e)
4364 gfc_symbol *sym, *old_sym;
4368 gfc_actual_arglist *arg, *tail = NULL;
4369 bool retval = e->expr_type == EXPR_FUNCTION;
4371 /* If the expression is the result of substitution in
4372 interface.c(gfc_extend_expr) because there is no way in
4373 which the host association can be wrong. */
4374 if (e->symtree == NULL
4375 || e->symtree->n.sym == NULL
4376 || e->user_operator)
4379 old_sym = e->symtree->n.sym;
4381 if (gfc_current_ns->parent
4382 && old_sym->ns != gfc_current_ns)
4384 /* Use the 'USE' name so that renamed module symbols are
4385 correctly handled. */
4386 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4388 if (sym && old_sym != sym
4389 && sym->ts.type == old_sym->ts.type
4390 && sym->attr.flavor == FL_PROCEDURE
4391 && sym->attr.contained)
4393 /* Clear the shape, since it might not be valid. */
4394 if (e->shape != NULL)
4396 for (n = 0; n < e->rank; n++)
4397 mpz_clear (e->shape[n]);
4399 gfc_free (e->shape);
4402 /* Give the symbol a symtree in the right place! */
4403 gfc_get_sym_tree (sym->name, gfc_current_ns, &st);
4406 if (old_sym->attr.flavor == FL_PROCEDURE)
4408 /* Original was function so point to the new symbol, since
4409 the actual argument list is already attached to the
4411 e->value.function.esym = NULL;
4416 /* Original was variable so convert array references into
4417 an actual arglist. This does not need any checking now
4418 since gfc_resolve_function will take care of it. */
4419 e->value.function.actual = NULL;
4420 e->expr_type = EXPR_FUNCTION;
4423 /* Ambiguity will not arise if the array reference is not
4424 the last reference. */
4425 for (ref = e->ref; ref; ref = ref->next)
4426 if (ref->type == REF_ARRAY && ref->next == NULL)
4429 gcc_assert (ref->type == REF_ARRAY);
4431 /* Grab the start expressions from the array ref and
4432 copy them into actual arguments. */
4433 for (n = 0; n < ref->u.ar.dimen; n++)
4435 arg = gfc_get_actual_arglist ();
4436 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4437 if (e->value.function.actual == NULL)
4438 tail = e->value.function.actual = arg;
4446 /* Dump the reference list and set the rank. */
4447 gfc_free_ref_list (e->ref);
4449 e->rank = sym->as ? sym->as->rank : 0;
4452 gfc_resolve_expr (e);
4456 /* This might have changed! */
4457 return e->expr_type == EXPR_FUNCTION;
4462 gfc_resolve_character_operator (gfc_expr *e)
4464 gfc_expr *op1 = e->value.op.op1;
4465 gfc_expr *op2 = e->value.op.op2;
4466 gfc_expr *e1 = NULL;
4467 gfc_expr *e2 = NULL;
4469 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4471 if (op1->ts.cl && op1->ts.cl->length)
4472 e1 = gfc_copy_expr (op1->ts.cl->length);
4473 else if (op1->expr_type == EXPR_CONSTANT)
4474 e1 = gfc_int_expr (op1->value.character.length);
4476 if (op2->ts.cl && op2->ts.cl->length)
4477 e2 = gfc_copy_expr (op2->ts.cl->length);
4478 else if (op2->expr_type == EXPR_CONSTANT)
4479 e2 = gfc_int_expr (op2->value.character.length);
4481 e->ts.cl = gfc_get_charlen ();
4482 e->ts.cl->next = gfc_current_ns->cl_list;
4483 gfc_current_ns->cl_list = e->ts.cl;
4488 e->ts.cl->length = gfc_add (e1, e2);
4489 e->ts.cl->length->ts.type = BT_INTEGER;
4490 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;
4491 gfc_simplify_expr (e->ts.cl->length, 0);
4492 gfc_resolve_expr (e->ts.cl->length);
4498 /* Ensure that an character expression has a charlen and, if possible, a
4499 length expression. */
4502 fixup_charlen (gfc_expr *e)
4504 /* The cases fall through so that changes in expression type and the need
4505 for multiple fixes are picked up. In all circumstances, a charlen should
4506 be available for the middle end to hang a backend_decl on. */
4507 switch (e->expr_type)
4510 gfc_resolve_character_operator (e);
4513 if (e->expr_type == EXPR_ARRAY)
4514 gfc_resolve_character_array_constructor (e);
4516 case EXPR_SUBSTRING:
4517 if (!e->ts.cl && e->ref)
4518 gfc_resolve_substring_charlen (e);
4523 e->ts.cl = gfc_get_charlen ();
4524 e->ts.cl->next = gfc_current_ns->cl_list;
4525 gfc_current_ns->cl_list = e->ts.cl;
4533 /* Update an actual argument to include the passed-object for type-bound
4534 procedures at the right position. */
4536 static gfc_actual_arglist*
4537 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos)
4539 gcc_assert (argpos > 0);
4543 gfc_actual_arglist* result;
4545 result = gfc_get_actual_arglist ();
4553 gcc_assert (argpos > 1);
4555 lst->next = update_arglist_pass (lst->next, po, argpos - 1);
4560 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4563 extract_compcall_passed_object (gfc_expr* e)
4567 gcc_assert (e->expr_type == EXPR_COMPCALL);
4569 po = gfc_get_expr ();
4570 po->expr_type = EXPR_VARIABLE;
4571 po->symtree = e->symtree;
4572 po->ref = gfc_copy_ref (e->ref);
4574 if (gfc_resolve_expr (po) == FAILURE)
4581 /* Update the arglist of an EXPR_COMPCALL expression to include the
4585 update_compcall_arglist (gfc_expr* e)
4588 gfc_typebound_proc* tbp;
4590 tbp = e->value.compcall.tbp;
4595 po = extract_compcall_passed_object (e);
4601 gfc_error ("Passed-object at %L must be scalar", &e->where);
4611 gcc_assert (tbp->pass_arg_num > 0);
4612 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4619 /* Check that the object a TBP is called on is valid, i.e. it must not be
4620 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
4623 check_typebound_baseobject (gfc_expr* e)
4627 base = extract_compcall_passed_object (e);
4631 gcc_assert (base->ts.type == BT_DERIVED);
4632 if (base->ts.derived->attr.abstract)
4634 gfc_error ("Base object for type-bound procedure call at %L is of"
4635 " ABSTRACT type '%s'", &e->where, base->ts.derived->name);
4643 /* Resolve a call to a type-bound procedure, either function or subroutine,
4644 statically from the data in an EXPR_COMPCALL expression. The adapted
4645 arglist and the target-procedure symtree are returned. */
4648 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
4649 gfc_actual_arglist** actual)
4651 gcc_assert (e->expr_type == EXPR_COMPCALL);
4652 gcc_assert (!e->value.compcall.tbp->is_generic);
4654 /* Update the actual arglist for PASS. */
4655 if (update_compcall_arglist (e) == FAILURE)
4658 *actual = e->value.compcall.actual;
4659 *target = e->value.compcall.tbp->u.specific;
4661 gfc_free_ref_list (e->ref);
4663 e->value.compcall.actual = NULL;
4669 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
4670 which of the specific bindings (if any) matches the arglist and transform
4671 the expression into a call of that binding. */
4674 resolve_typebound_generic_call (gfc_expr* e)
4676 gfc_typebound_proc* genproc;
4677 const char* genname;
4679 gcc_assert (e->expr_type == EXPR_COMPCALL);
4680 genname = e->value.compcall.name;
4681 genproc = e->value.compcall.tbp;
4683 if (!genproc->is_generic)
4686 /* Try the bindings on this type and in the inheritance hierarchy. */
4687 for (; genproc; genproc = genproc->overridden)
4691 gcc_assert (genproc->is_generic);
4692 for (g = genproc->u.generic; g; g = g->next)
4695 gfc_actual_arglist* args;
4698 gcc_assert (g->specific);
4700 if (g->specific->error)
4703 target = g->specific->u.specific->n.sym;
4705 /* Get the right arglist by handling PASS/NOPASS. */
4706 args = gfc_copy_actual_arglist (e->value.compcall.actual);
4707 if (!g->specific->nopass)
4710 po = extract_compcall_passed_object (e);
4714 gcc_assert (g->specific->pass_arg_num > 0);
4715 gcc_assert (!g->specific->error);
4716 args = update_arglist_pass (args, po, g->specific->pass_arg_num);
4718 resolve_actual_arglist (args, target->attr.proc,
4719 is_external_proc (target) && !target->formal);
4721 /* Check if this arglist matches the formal. */
4722 matches = gfc_arglist_matches_symbol (&args, target);
4724 /* Clean up and break out of the loop if we've found it. */
4725 gfc_free_actual_arglist (args);
4728 e->value.compcall.tbp = g->specific;
4734 /* Nothing matching found! */
4735 gfc_error ("Found no matching specific binding for the call to the GENERIC"
4736 " '%s' at %L", genname, &e->where);
4744 /* Resolve a call to a type-bound subroutine. */
4747 resolve_typebound_call (gfc_code* c)
4749 gfc_actual_arglist* newactual;
4750 gfc_symtree* target;
4752 /* Check that's really a SUBROUTINE. */
4753 if (!c->expr1->value.compcall.tbp->subroutine)
4755 gfc_error ("'%s' at %L should be a SUBROUTINE",
4756 c->expr1->value.compcall.name, &c->loc);
4760 if (check_typebound_baseobject (c->expr1) == FAILURE)
4763 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
4766 /* Transform into an ordinary EXEC_CALL for now. */
4768 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
4771 c->ext.actual = newactual;
4772 c->symtree = target;
4775 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
4776 gfc_free_expr (c->expr1);
4779 return resolve_call (c);
4783 /* Resolve a component-call expression. */
4786 resolve_compcall (gfc_expr* e)
4788 gfc_actual_arglist* newactual;
4789 gfc_symtree* target;
4791 /* Check that's really a FUNCTION. */
4792 if (!e->value.compcall.tbp->function)
4794 gfc_error ("'%s' at %L should be a FUNCTION",
4795 e->value.compcall.name, &e->where);
4799 if (check_typebound_baseobject (e) == FAILURE)
4802 if (resolve_typebound_generic_call (e) == FAILURE)
4804 gcc_assert (!e->value.compcall.tbp->is_generic);
4806 /* Take the rank from the function's symbol. */
4807 if (e->value.compcall.tbp->u.specific->n.sym->as)
4808 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
4810 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
4811 arglist to the TBP's binding target. */
4813 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
4816 e->value.function.actual = newactual;
4817 e->value.function.name = e->value.compcall.name;
4818 e->value.function.isym = NULL;
4819 e->value.function.esym = NULL;
4820 e->symtree = target;
4821 e->ts = target->n.sym->ts;
4822 e->expr_type = EXPR_FUNCTION;
4824 return gfc_resolve_expr (e);
4828 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
4831 resolve_ppc_call (gfc_code* c)
4833 gfc_component *comp;
4834 gcc_assert (is_proc_ptr_comp (c->expr1, &comp));
4836 c->resolved_sym = c->expr1->symtree->n.sym;
4837 c->expr1->expr_type = EXPR_VARIABLE;
4838 c->ext.actual = c->expr1->value.compcall.actual;
4840 if (!comp->attr.subroutine)
4841 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
4843 if (resolve_ref (c->expr1) == FAILURE)
4846 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
4847 comp->formal == NULL) == FAILURE)
4850 /* TODO: Check actual arguments.
4851 gfc_procedure_use (stree->n.sym, &c->expr1->value.compcall.actual,
4852 &c->expr1->where);*/
4858 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
4861 resolve_expr_ppc (gfc_expr* e)
4863 gfc_component *comp;
4864 gcc_assert (is_proc_ptr_comp (e, &comp));
4866 /* Convert to EXPR_FUNCTION. */
4867 e->expr_type = EXPR_FUNCTION;
4868 e->value.function.isym = NULL;
4869 e->value.function.actual = e->value.compcall.actual;
4872 if (!comp->attr.function)
4873 gfc_add_function (&comp->attr, comp->name, &e->where);
4875 if (resolve_ref (e) == FAILURE)
4878 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
4879 comp->formal == NULL) == FAILURE)
4882 /* TODO: Check actual arguments.
4883 gfc_procedure_use (stree->n.sym, &e->value.compcall.actual, &e->where); */
4889 /* Resolve an expression. That is, make sure that types of operands agree
4890 with their operators, intrinsic operators are converted to function calls
4891 for overloaded types and unresolved function references are resolved. */
4894 gfc_resolve_expr (gfc_expr *e)
4901 switch (e->expr_type)
4904 t = resolve_operator (e);
4910 if (check_host_association (e))
4911 t = resolve_function (e);
4914 t = resolve_variable (e);
4916 expression_rank (e);
4919 if (e->ts.type == BT_CHARACTER && e->ts.cl == NULL && e->ref
4920 && e->ref->type != REF_SUBSTRING)
4921 gfc_resolve_substring_charlen (e);
4926 t = resolve_compcall (e);
4929 case EXPR_SUBSTRING:
4930 t = resolve_ref (e);
4939 t = resolve_expr_ppc (e);
4944 if (resolve_ref (e) == FAILURE)
4947 t = gfc_resolve_array_constructor (e);
4948 /* Also try to expand a constructor. */
4951 expression_rank (e);
4952 gfc_expand_constructor (e);
4955 /* This provides the opportunity for the length of constructors with
4956 character valued function elements to propagate the string length
4957 to the expression. */
4958 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
4959 t = gfc_resolve_character_array_constructor (e);
4963 case EXPR_STRUCTURE:
4964 t = resolve_ref (e);
4968 t = resolve_structure_cons (e);
4972 t = gfc_simplify_expr (e, 0);
4976 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
4979 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.cl)
4986 /* Resolve an expression from an iterator. They must be scalar and have
4987 INTEGER or (optionally) REAL type. */
4990 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
4991 const char *name_msgid)
4993 if (gfc_resolve_expr (expr) == FAILURE)
4996 if (expr->rank != 0)
4998 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5002 if (expr->ts.type != BT_INTEGER)
5004 if (expr->ts.type == BT_REAL)
5007 return gfc_notify_std (GFC_STD_F95_DEL,
5008 "Deleted feature: %s at %L must be integer",
5009 _(name_msgid), &expr->where);
5012 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5019 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5027 /* Resolve the expressions in an iterator structure. If REAL_OK is
5028 false allow only INTEGER type iterators, otherwise allow REAL types. */
5031 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5033 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5037 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5039 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5044 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5045 "Start expression in DO loop") == FAILURE)
5048 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5049 "End expression in DO loop") == FAILURE)
5052 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5053 "Step expression in DO loop") == FAILURE)
5056 if (iter->step->expr_type == EXPR_CONSTANT)
5058 if ((iter->step->ts.type == BT_INTEGER
5059 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5060 || (iter->step->ts.type == BT_REAL
5061 && mpfr_sgn (iter->step->value.real) == 0))
5063 gfc_error ("Step expression in DO loop at %L cannot be zero",
5064 &iter->step->where);
5069 /* Convert start, end, and step to the same type as var. */
5070 if (iter->start->ts.kind != iter->var->ts.kind
5071 || iter->start->ts.type != iter->var->ts.type)
5072 gfc_convert_type (iter->start, &iter->var->ts, 2);
5074 if (iter->end->ts.kind != iter->var->ts.kind
5075 || iter->end->ts.type != iter->var->ts.type)
5076 gfc_convert_type (iter->end, &iter->var->ts, 2);
5078 if (iter->step->ts.kind != iter->var->ts.kind
5079 || iter->step->ts.type != iter->var->ts.type)
5080 gfc_convert_type (iter->step, &iter->var->ts, 2);
5082 if (iter->start->expr_type == EXPR_CONSTANT
5083 && iter->end->expr_type == EXPR_CONSTANT
5084 && iter->step->expr_type == EXPR_CONSTANT)
5087 if (iter->start->ts.type == BT_INTEGER)
5089 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5090 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5094 sgn = mpfr_sgn (iter->step->value.real);
5095 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5097 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5098 gfc_warning ("DO loop at %L will be executed zero times",
5099 &iter->step->where);
5106 /* Traversal function for find_forall_index. f == 2 signals that
5107 that variable itself is not to be checked - only the references. */
5110 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5112 if (expr->expr_type != EXPR_VARIABLE)
5115 /* A scalar assignment */
5116 if (!expr->ref || *f == 1)
5118 if (expr->symtree->n.sym == sym)
5130 /* Check whether the FORALL index appears in the expression or not.
5131 Returns SUCCESS if SYM is found in EXPR. */
5134 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5136 if (gfc_traverse_expr (expr, sym, forall_index, f))
5143 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5144 to be a scalar INTEGER variable. The subscripts and stride are scalar
5145 INTEGERs, and if stride is a constant it must be nonzero.
5146 Furthermore "A subscript or stride in a forall-triplet-spec shall
5147 not contain a reference to any index-name in the
5148 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5151 resolve_forall_iterators (gfc_forall_iterator *it)
5153 gfc_forall_iterator *iter, *iter2;
5155 for (iter = it; iter; iter = iter->next)
5157 if (gfc_resolve_expr (iter->var) == SUCCESS
5158 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5159 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5162 if (gfc_resolve_expr (iter->start) == SUCCESS
5163 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5164 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5165 &iter->start->where);
5166 if (iter->var->ts.kind != iter->start->ts.kind)
5167 gfc_convert_type (iter->start, &iter->var->ts, 2);
5169 if (gfc_resolve_expr (iter->end) == SUCCESS
5170 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5171 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5173 if (iter->var->ts.kind != iter->end->ts.kind)
5174 gfc_convert_type (iter->end, &iter->var->ts, 2);
5176 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5178 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5179 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5180 &iter->stride->where, "INTEGER");
5182 if (iter->stride->expr_type == EXPR_CONSTANT
5183 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5184 gfc_error ("FORALL stride expression at %L cannot be zero",
5185 &iter->stride->where);
5187 if (iter->var->ts.kind != iter->stride->ts.kind)
5188 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5191 for (iter = it; iter; iter = iter->next)
5192 for (iter2 = iter; iter2; iter2 = iter2->next)
5194 if (find_forall_index (iter2->start,
5195 iter->var->symtree->n.sym, 0) == SUCCESS
5196 || find_forall_index (iter2->end,
5197 iter->var->symtree->n.sym, 0) == SUCCESS
5198 || find_forall_index (iter2->stride,
5199 iter->var->symtree->n.sym, 0) == SUCCESS)
5200 gfc_error ("FORALL index '%s' may not appear in triplet "
5201 "specification at %L", iter->var->symtree->name,
5202 &iter2->start->where);
5207 /* Given a pointer to a symbol that is a derived type, see if it's
5208 inaccessible, i.e. if it's defined in another module and the components are
5209 PRIVATE. The search is recursive if necessary. Returns zero if no
5210 inaccessible components are found, nonzero otherwise. */
5213 derived_inaccessible (gfc_symbol *sym)
5217 if (sym->attr.use_assoc && sym->attr.private_comp)
5220 for (c = sym->components; c; c = c->next)
5222 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.derived))
5230 /* Resolve the argument of a deallocate expression. The expression must be
5231 a pointer or a full array. */
5234 resolve_deallocate_expr (gfc_expr *e)
5236 symbol_attribute attr;
5237 int allocatable, pointer, check_intent_in;
5240 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5241 check_intent_in = 1;
5243 if (gfc_resolve_expr (e) == FAILURE)
5246 if (e->expr_type != EXPR_VARIABLE)
5249 allocatable = e->symtree->n.sym->attr.allocatable;
5250 pointer = e->symtree->n.sym->attr.pointer;
5251 for (ref = e->ref; ref; ref = ref->next)
5254 check_intent_in = 0;
5259 if (ref->u.ar.type != AR_FULL)
5264 allocatable = (ref->u.c.component->as != NULL
5265 && ref->u.c.component->as->type == AS_DEFERRED);
5266 pointer = ref->u.c.component->attr.pointer;
5275 attr = gfc_expr_attr (e);
5277 if (allocatable == 0 && attr.pointer == 0)
5280 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5285 && e->symtree->n.sym->attr.intent == INTENT_IN)
5287 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5288 e->symtree->n.sym->name, &e->where);
5296 /* Returns true if the expression e contains a reference to the symbol sym. */
5298 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5300 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
5307 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
5309 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
5313 /* Given the expression node e for an allocatable/pointer of derived type to be
5314 allocated, get the expression node to be initialized afterwards (needed for
5315 derived types with default initializers, and derived types with allocatable
5316 components that need nullification.) */
5319 expr_to_initialize (gfc_expr *e)
5325 result = gfc_copy_expr (e);
5327 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
5328 for (ref = result->ref; ref; ref = ref->next)
5329 if (ref->type == REF_ARRAY && ref->next == NULL)
5331 ref->u.ar.type = AR_FULL;
5333 for (i = 0; i < ref->u.ar.dimen; i++)
5334 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
5336 result->rank = ref->u.ar.dimen;
5344 /* Resolve the expression in an ALLOCATE statement, doing the additional
5345 checks to see whether the expression is OK or not. The expression must
5346 have a trailing array reference that gives the size of the array. */
5349 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
5351 int i, pointer, allocatable, dimension, check_intent_in;
5352 symbol_attribute attr;
5353 gfc_ref *ref, *ref2;
5360 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5361 check_intent_in = 1;
5363 if (gfc_resolve_expr (e) == FAILURE)
5366 /* Make sure the expression is allocatable or a pointer. If it is
5367 pointer, the next-to-last reference must be a pointer. */
5371 if (e->expr_type != EXPR_VARIABLE)
5374 attr = gfc_expr_attr (e);
5375 pointer = attr.pointer;
5376 dimension = attr.dimension;
5380 allocatable = e->symtree->n.sym->attr.allocatable;
5381 pointer = e->symtree->n.sym->attr.pointer;
5382 dimension = e->symtree->n.sym->attr.dimension;
5384 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
5387 check_intent_in = 0;
5392 if (ref->next != NULL)
5397 allocatable = (ref->u.c.component->as != NULL
5398 && ref->u.c.component->as->type == AS_DEFERRED);
5400 pointer = ref->u.c.component->attr.pointer;
5401 dimension = ref->u.c.component->attr.dimension;
5412 if (allocatable == 0 && pointer == 0)
5414 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5420 && e->symtree->n.sym->attr.intent == INTENT_IN)
5422 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
5423 e->symtree->n.sym->name, &e->where);
5427 /* Add default initializer for those derived types that need them. */
5428 if (e->ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&e->ts)))
5430 init_st = gfc_get_code ();
5431 init_st->loc = code->loc;
5432 init_st->op = EXEC_INIT_ASSIGN;
5433 init_st->expr1 = expr_to_initialize (e);
5434 init_st->expr2 = init_e;
5435 init_st->next = code->next;
5436 code->next = init_st;
5439 if (pointer && dimension == 0)
5442 /* Make sure the next-to-last reference node is an array specification. */
5444 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
5446 gfc_error ("Array specification required in ALLOCATE statement "
5447 "at %L", &e->where);
5451 /* Make sure that the array section reference makes sense in the
5452 context of an ALLOCATE specification. */
5456 for (i = 0; i < ar->dimen; i++)
5458 if (ref2->u.ar.type == AR_ELEMENT)
5461 switch (ar->dimen_type[i])
5467 if (ar->start[i] != NULL
5468 && ar->end[i] != NULL
5469 && ar->stride[i] == NULL)
5472 /* Fall Through... */
5476 gfc_error ("Bad array specification in ALLOCATE statement at %L",
5483 for (a = code->ext.alloc_list; a; a = a->next)
5485 sym = a->expr->symtree->n.sym;
5487 /* TODO - check derived type components. */
5488 if (sym->ts.type == BT_DERIVED)
5491 if ((ar->start[i] != NULL
5492 && gfc_find_sym_in_expr (sym, ar->start[i]))
5493 || (ar->end[i] != NULL
5494 && gfc_find_sym_in_expr (sym, ar->end[i])))
5496 gfc_error ("'%s' must not appear in the array specification at "
5497 "%L in the same ALLOCATE statement where it is "
5498 "itself allocated", sym->name, &ar->where);
5508 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
5510 gfc_expr *stat, *errmsg, *pe, *qe;
5511 gfc_alloc *a, *p, *q;
5513 stat = code->expr1 ? code->expr1 : NULL;
5515 errmsg = code->expr2 ? code->expr2 : NULL;
5517 /* Check the stat variable. */
5520 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
5521 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
5522 stat->symtree->n.sym->name, &stat->where);
5524 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
5525 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
5528 if (stat->ts.type != BT_INTEGER
5529 && !(stat->ref && (stat->ref->type == REF_ARRAY
5530 || stat->ref->type == REF_COMPONENT)))
5531 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
5532 "variable", &stat->where);
5534 for (p = code->ext.alloc_list; p; p = p->next)
5535 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
5536 gfc_error ("Stat-variable at %L shall not be %sd within "
5537 "the same %s statement", &stat->where, fcn, fcn);
5540 /* Check the errmsg variable. */
5544 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
5547 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
5548 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
5549 errmsg->symtree->n.sym->name, &errmsg->where);
5551 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
5552 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
5555 if (errmsg->ts.type != BT_CHARACTER
5557 && (errmsg->ref->type == REF_ARRAY
5558 || errmsg->ref->type == REF_COMPONENT)))
5559 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
5560 "variable", &errmsg->where);
5562 for (p = code->ext.alloc_list; p; p = p->next)
5563 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
5564 gfc_error ("Errmsg-variable at %L shall not be %sd within "
5565 "the same %s statement", &errmsg->where, fcn, fcn);
5568 /* Check that an allocate-object appears only once in the statement.
5569 FIXME: Checking derived types is disabled. */
5570 for (p = code->ext.alloc_list; p; p = p->next)
5573 if ((pe->ref && pe->ref->type != REF_COMPONENT)
5574 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
5576 for (q = p->next; q; q = q->next)
5579 if ((qe->ref && qe->ref->type != REF_COMPONENT)
5580 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
5581 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
5582 gfc_error ("Allocate-object at %L also appears at %L",
5583 &pe->where, &qe->where);
5588 if (strcmp (fcn, "ALLOCATE") == 0)
5590 for (a = code->ext.alloc_list; a; a = a->next)
5591 resolve_allocate_expr (a->expr, code);
5595 for (a = code->ext.alloc_list; a; a = a->next)
5596 resolve_deallocate_expr (a->expr);
5601 /************ SELECT CASE resolution subroutines ************/
5603 /* Callback function for our mergesort variant. Determines interval
5604 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
5605 op1 > op2. Assumes we're not dealing with the default case.
5606 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
5607 There are nine situations to check. */
5610 compare_cases (const gfc_case *op1, const gfc_case *op2)
5614 if (op1->low == NULL) /* op1 = (:L) */
5616 /* op2 = (:N), so overlap. */
5618 /* op2 = (M:) or (M:N), L < M */
5619 if (op2->low != NULL
5620 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5623 else if (op1->high == NULL) /* op1 = (K:) */
5625 /* op2 = (M:), so overlap. */
5627 /* op2 = (:N) or (M:N), K > N */
5628 if (op2->high != NULL
5629 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5632 else /* op1 = (K:L) */
5634 if (op2->low == NULL) /* op2 = (:N), K > N */
5635 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5637 else if (op2->high == NULL) /* op2 = (M:), L < M */
5638 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5640 else /* op2 = (M:N) */
5644 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5647 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5656 /* Merge-sort a double linked case list, detecting overlap in the
5657 process. LIST is the head of the double linked case list before it
5658 is sorted. Returns the head of the sorted list if we don't see any
5659 overlap, or NULL otherwise. */
5662 check_case_overlap (gfc_case *list)
5664 gfc_case *p, *q, *e, *tail;
5665 int insize, nmerges, psize, qsize, cmp, overlap_seen;
5667 /* If the passed list was empty, return immediately. */
5674 /* Loop unconditionally. The only exit from this loop is a return
5675 statement, when we've finished sorting the case list. */
5682 /* Count the number of merges we do in this pass. */
5685 /* Loop while there exists a merge to be done. */
5690 /* Count this merge. */
5693 /* Cut the list in two pieces by stepping INSIZE places
5694 forward in the list, starting from P. */
5697 for (i = 0; i < insize; i++)
5706 /* Now we have two lists. Merge them! */
5707 while (psize > 0 || (qsize > 0 && q != NULL))
5709 /* See from which the next case to merge comes from. */
5712 /* P is empty so the next case must come from Q. */
5717 else if (qsize == 0 || q == NULL)
5726 cmp = compare_cases (p, q);
5729 /* The whole case range for P is less than the
5737 /* The whole case range for Q is greater than
5738 the case range for P. */
5745 /* The cases overlap, or they are the same
5746 element in the list. Either way, we must
5747 issue an error and get the next case from P. */
5748 /* FIXME: Sort P and Q by line number. */
5749 gfc_error ("CASE label at %L overlaps with CASE "
5750 "label at %L", &p->where, &q->where);
5758 /* Add the next element to the merged list. */
5767 /* P has now stepped INSIZE places along, and so has Q. So
5768 they're the same. */
5773 /* If we have done only one merge or none at all, we've
5774 finished sorting the cases. */
5783 /* Otherwise repeat, merging lists twice the size. */
5789 /* Check to see if an expression is suitable for use in a CASE statement.
5790 Makes sure that all case expressions are scalar constants of the same
5791 type. Return FAILURE if anything is wrong. */
5794 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
5796 if (e == NULL) return SUCCESS;
5798 if (e->ts.type != case_expr->ts.type)
5800 gfc_error ("Expression in CASE statement at %L must be of type %s",
5801 &e->where, gfc_basic_typename (case_expr->ts.type));
5805 /* C805 (R808) For a given case-construct, each case-value shall be of
5806 the same type as case-expr. For character type, length differences
5807 are allowed, but the kind type parameters shall be the same. */
5809 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
5811 gfc_error ("Expression in CASE statement at %L must be of kind %d",
5812 &e->where, case_expr->ts.kind);
5816 /* Convert the case value kind to that of case expression kind, if needed.
5817 FIXME: Should a warning be issued? */
5818 if (e->ts.kind != case_expr->ts.kind)
5819 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
5823 gfc_error ("Expression in CASE statement at %L must be scalar",
5832 /* Given a completely parsed select statement, we:
5834 - Validate all expressions and code within the SELECT.
5835 - Make sure that the selection expression is not of the wrong type.
5836 - Make sure that no case ranges overlap.
5837 - Eliminate unreachable cases and unreachable code resulting from
5838 removing case labels.
5840 The standard does allow unreachable cases, e.g. CASE (5:3). But
5841 they are a hassle for code generation, and to prevent that, we just
5842 cut them out here. This is not necessary for overlapping cases
5843 because they are illegal and we never even try to generate code.
5845 We have the additional caveat that a SELECT construct could have
5846 been a computed GOTO in the source code. Fortunately we can fairly
5847 easily work around that here: The case_expr for a "real" SELECT CASE
5848 is in code->expr1, but for a computed GOTO it is in code->expr2. All
5849 we have to do is make sure that the case_expr is a scalar integer
5853 resolve_select (gfc_code *code)
5856 gfc_expr *case_expr;
5857 gfc_case *cp, *default_case, *tail, *head;
5858 int seen_unreachable;
5864 if (code->expr1 == NULL)
5866 /* This was actually a computed GOTO statement. */
5867 case_expr = code->expr2;
5868 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
5869 gfc_error ("Selection expression in computed GOTO statement "
5870 "at %L must be a scalar integer expression",
5873 /* Further checking is not necessary because this SELECT was built
5874 by the compiler, so it should always be OK. Just move the
5875 case_expr from expr2 to expr so that we can handle computed
5876 GOTOs as normal SELECTs from here on. */
5877 code->expr1 = code->expr2;
5882 case_expr = code->expr1;
5884 type = case_expr->ts.type;
5885 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
5887 gfc_error ("Argument of SELECT statement at %L cannot be %s",
5888 &case_expr->where, gfc_typename (&case_expr->ts));
5890 /* Punt. Going on here just produce more garbage error messages. */
5894 if (case_expr->rank != 0)
5896 gfc_error ("Argument of SELECT statement at %L must be a scalar "
5897 "expression", &case_expr->where);
5903 /* PR 19168 has a long discussion concerning a mismatch of the kinds
5904 of the SELECT CASE expression and its CASE values. Walk the lists
5905 of case values, and if we find a mismatch, promote case_expr to
5906 the appropriate kind. */
5908 if (type == BT_LOGICAL || type == BT_INTEGER)
5910 for (body = code->block; body; body = body->block)
5912 /* Walk the case label list. */
5913 for (cp = body->ext.case_list; cp; cp = cp->next)
5915 /* Intercept the DEFAULT case. It does not have a kind. */
5916 if (cp->low == NULL && cp->high == NULL)
5919 /* Unreachable case ranges are discarded, so ignore. */
5920 if (cp->low != NULL && cp->high != NULL
5921 && cp->low != cp->high
5922 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
5925 /* FIXME: Should a warning be issued? */
5927 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
5928 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
5930 if (cp->high != NULL
5931 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
5932 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
5937 /* Assume there is no DEFAULT case. */
5938 default_case = NULL;
5943 for (body = code->block; body; body = body->block)
5945 /* Assume the CASE list is OK, and all CASE labels can be matched. */
5947 seen_unreachable = 0;
5949 /* Walk the case label list, making sure that all case labels
5951 for (cp = body->ext.case_list; cp; cp = cp->next)
5953 /* Count the number of cases in the whole construct. */
5956 /* Intercept the DEFAULT case. */
5957 if (cp->low == NULL && cp->high == NULL)
5959 if (default_case != NULL)
5961 gfc_error ("The DEFAULT CASE at %L cannot be followed "
5962 "by a second DEFAULT CASE at %L",
5963 &default_case->where, &cp->where);
5974 /* Deal with single value cases and case ranges. Errors are
5975 issued from the validation function. */
5976 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
5977 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
5983 if (type == BT_LOGICAL
5984 && ((cp->low == NULL || cp->high == NULL)
5985 || cp->low != cp->high))
5987 gfc_error ("Logical range in CASE statement at %L is not "
5988 "allowed", &cp->low->where);
5993 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
5996 value = cp->low->value.logical == 0 ? 2 : 1;
5997 if (value & seen_logical)
5999 gfc_error ("constant logical value in CASE statement "
6000 "is repeated at %L",
6005 seen_logical |= value;
6008 if (cp->low != NULL && cp->high != NULL
6009 && cp->low != cp->high
6010 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6012 if (gfc_option.warn_surprising)
6013 gfc_warning ("Range specification at %L can never "
6014 "be matched", &cp->where);
6016 cp->unreachable = 1;
6017 seen_unreachable = 1;
6021 /* If the case range can be matched, it can also overlap with
6022 other cases. To make sure it does not, we put it in a
6023 double linked list here. We sort that with a merge sort
6024 later on to detect any overlapping cases. */
6028 head->right = head->left = NULL;
6033 tail->right->left = tail;
6040 /* It there was a failure in the previous case label, give up
6041 for this case label list. Continue with the next block. */
6045 /* See if any case labels that are unreachable have been seen.
6046 If so, we eliminate them. This is a bit of a kludge because
6047 the case lists for a single case statement (label) is a
6048 single forward linked lists. */
6049 if (seen_unreachable)
6051 /* Advance until the first case in the list is reachable. */
6052 while (body->ext.case_list != NULL
6053 && body->ext.case_list->unreachable)
6055 gfc_case *n = body->ext.case_list;
6056 body->ext.case_list = body->ext.case_list->next;
6058 gfc_free_case_list (n);
6061 /* Strip all other unreachable cases. */
6062 if (body->ext.case_list)
6064 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6066 if (cp->next->unreachable)
6068 gfc_case *n = cp->next;
6069 cp->next = cp->next->next;
6071 gfc_free_case_list (n);
6078 /* See if there were overlapping cases. If the check returns NULL,
6079 there was overlap. In that case we don't do anything. If head
6080 is non-NULL, we prepend the DEFAULT case. The sorted list can
6081 then used during code generation for SELECT CASE constructs with
6082 a case expression of a CHARACTER type. */
6085 head = check_case_overlap (head);
6087 /* Prepend the default_case if it is there. */
6088 if (head != NULL && default_case)
6090 default_case->left = NULL;
6091 default_case->right = head;
6092 head->left = default_case;
6096 /* Eliminate dead blocks that may be the result if we've seen
6097 unreachable case labels for a block. */
6098 for (body = code; body && body->block; body = body->block)
6100 if (body->block->ext.case_list == NULL)
6102 /* Cut the unreachable block from the code chain. */
6103 gfc_code *c = body->block;
6104 body->block = c->block;
6106 /* Kill the dead block, but not the blocks below it. */
6108 gfc_free_statements (c);
6112 /* More than two cases is legal but insane for logical selects.
6113 Issue a warning for it. */
6114 if (gfc_option.warn_surprising && type == BT_LOGICAL
6116 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6121 /* Resolve a transfer statement. This is making sure that:
6122 -- a derived type being transferred has only non-pointer components
6123 -- a derived type being transferred doesn't have private components, unless
6124 it's being transferred from the module where the type was defined
6125 -- we're not trying to transfer a whole assumed size array. */
6128 resolve_transfer (gfc_code *code)
6137 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
6140 sym = exp->symtree->n.sym;
6143 /* Go to actual component transferred. */
6144 for (ref = code->expr1->ref; ref; ref = ref->next)
6145 if (ref->type == REF_COMPONENT)
6146 ts = &ref->u.c.component->ts;
6148 if (ts->type == BT_DERIVED)
6150 /* Check that transferred derived type doesn't contain POINTER
6152 if (ts->derived->attr.pointer_comp)
6154 gfc_error ("Data transfer element at %L cannot have "
6155 "POINTER components", &code->loc);
6159 if (ts->derived->attr.alloc_comp)
6161 gfc_error ("Data transfer element at %L cannot have "
6162 "ALLOCATABLE components", &code->loc);
6166 if (derived_inaccessible (ts->derived))
6168 gfc_error ("Data transfer element at %L cannot have "
6169 "PRIVATE components",&code->loc);
6174 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
6175 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
6177 gfc_error ("Data transfer element at %L cannot be a full reference to "
6178 "an assumed-size array", &code->loc);
6184 /*********** Toplevel code resolution subroutines ***********/
6186 /* Find the set of labels that are reachable from this block. We also
6187 record the last statement in each block. */
6190 find_reachable_labels (gfc_code *block)
6197 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
6199 /* Collect labels in this block. We don't keep those corresponding
6200 to END {IF|SELECT}, these are checked in resolve_branch by going
6201 up through the code_stack. */
6202 for (c = block; c; c = c->next)
6204 if (c->here && c->op != EXEC_END_BLOCK)
6205 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
6208 /* Merge with labels from parent block. */
6211 gcc_assert (cs_base->prev->reachable_labels);
6212 bitmap_ior_into (cs_base->reachable_labels,
6213 cs_base->prev->reachable_labels);
6217 /* Given a branch to a label, see if the branch is conforming.
6218 The code node describes where the branch is located. */
6221 resolve_branch (gfc_st_label *label, gfc_code *code)
6228 /* Step one: is this a valid branching target? */
6230 if (label->defined == ST_LABEL_UNKNOWN)
6232 gfc_error ("Label %d referenced at %L is never defined", label->value,
6237 if (label->defined != ST_LABEL_TARGET)
6239 gfc_error ("Statement at %L is not a valid branch target statement "
6240 "for the branch statement at %L", &label->where, &code->loc);
6244 /* Step two: make sure this branch is not a branch to itself ;-) */
6246 if (code->here == label)
6248 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
6252 /* Step three: See if the label is in the same block as the
6253 branching statement. The hard work has been done by setting up
6254 the bitmap reachable_labels. */
6256 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
6259 /* Step four: If we haven't found the label in the bitmap, it may
6260 still be the label of the END of the enclosing block, in which
6261 case we find it by going up the code_stack. */
6263 for (stack = cs_base; stack; stack = stack->prev)
6264 if (stack->current->next && stack->current->next->here == label)
6269 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
6273 /* The label is not in an enclosing block, so illegal. This was
6274 allowed in Fortran 66, so we allow it as extension. No
6275 further checks are necessary in this case. */
6276 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
6277 "as the GOTO statement at %L", &label->where,
6283 /* Check whether EXPR1 has the same shape as EXPR2. */
6286 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
6288 mpz_t shape[GFC_MAX_DIMENSIONS];
6289 mpz_t shape2[GFC_MAX_DIMENSIONS];
6290 gfc_try result = FAILURE;
6293 /* Compare the rank. */
6294 if (expr1->rank != expr2->rank)
6297 /* Compare the size of each dimension. */
6298 for (i=0; i<expr1->rank; i++)
6300 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
6303 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
6306 if (mpz_cmp (shape[i], shape2[i]))
6310 /* When either of the two expression is an assumed size array, we
6311 ignore the comparison of dimension sizes. */
6316 for (i--; i >= 0; i--)
6318 mpz_clear (shape[i]);
6319 mpz_clear (shape2[i]);
6325 /* Check whether a WHERE assignment target or a WHERE mask expression
6326 has the same shape as the outmost WHERE mask expression. */
6329 resolve_where (gfc_code *code, gfc_expr *mask)
6335 cblock = code->block;
6337 /* Store the first WHERE mask-expr of the WHERE statement or construct.
6338 In case of nested WHERE, only the outmost one is stored. */
6339 if (mask == NULL) /* outmost WHERE */
6341 else /* inner WHERE */
6348 /* Check if the mask-expr has a consistent shape with the
6349 outmost WHERE mask-expr. */
6350 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
6351 gfc_error ("WHERE mask at %L has inconsistent shape",
6352 &cblock->expr1->where);
6355 /* the assignment statement of a WHERE statement, or the first
6356 statement in where-body-construct of a WHERE construct */
6357 cnext = cblock->next;
6362 /* WHERE assignment statement */
6365 /* Check shape consistent for WHERE assignment target. */
6366 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
6367 gfc_error ("WHERE assignment target at %L has "
6368 "inconsistent shape", &cnext->expr1->where);
6372 case EXEC_ASSIGN_CALL:
6373 resolve_call (cnext);
6374 if (!cnext->resolved_sym->attr.elemental)
6375 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6376 &cnext->ext.actual->expr->where);
6379 /* WHERE or WHERE construct is part of a where-body-construct */
6381 resolve_where (cnext, e);
6385 gfc_error ("Unsupported statement inside WHERE at %L",
6388 /* the next statement within the same where-body-construct */
6389 cnext = cnext->next;
6391 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6392 cblock = cblock->block;
6397 /* Resolve assignment in FORALL construct.
6398 NVAR is the number of FORALL index variables, and VAR_EXPR records the
6399 FORALL index variables. */
6402 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
6406 for (n = 0; n < nvar; n++)
6408 gfc_symbol *forall_index;
6410 forall_index = var_expr[n]->symtree->n.sym;
6412 /* Check whether the assignment target is one of the FORALL index
6414 if ((code->expr1->expr_type == EXPR_VARIABLE)
6415 && (code->expr1->symtree->n.sym == forall_index))
6416 gfc_error ("Assignment to a FORALL index variable at %L",
6417 &code->expr1->where);
6420 /* If one of the FORALL index variables doesn't appear in the
6421 assignment variable, then there could be a many-to-one
6422 assignment. Emit a warning rather than an error because the
6423 mask could be resolving this problem. */
6424 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
6425 gfc_warning ("The FORALL with index '%s' is not used on the "
6426 "left side of the assignment at %L and so might "
6427 "cause multiple assignment to this object",
6428 var_expr[n]->symtree->name, &code->expr1->where);
6434 /* Resolve WHERE statement in FORALL construct. */
6437 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
6438 gfc_expr **var_expr)
6443 cblock = code->block;
6446 /* the assignment statement of a WHERE statement, or the first
6447 statement in where-body-construct of a WHERE construct */
6448 cnext = cblock->next;
6453 /* WHERE assignment statement */
6455 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
6458 /* WHERE operator assignment statement */
6459 case EXEC_ASSIGN_CALL:
6460 resolve_call (cnext);
6461 if (!cnext->resolved_sym->attr.elemental)
6462 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6463 &cnext->ext.actual->expr->where);
6466 /* WHERE or WHERE construct is part of a where-body-construct */
6468 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
6472 gfc_error ("Unsupported statement inside WHERE at %L",
6475 /* the next statement within the same where-body-construct */
6476 cnext = cnext->next;
6478 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6479 cblock = cblock->block;
6484 /* Traverse the FORALL body to check whether the following errors exist:
6485 1. For assignment, check if a many-to-one assignment happens.
6486 2. For WHERE statement, check the WHERE body to see if there is any
6487 many-to-one assignment. */
6490 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
6494 c = code->block->next;
6500 case EXEC_POINTER_ASSIGN:
6501 gfc_resolve_assign_in_forall (c, nvar, var_expr);
6504 case EXEC_ASSIGN_CALL:
6508 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
6509 there is no need to handle it here. */
6513 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
6518 /* The next statement in the FORALL body. */
6524 /* Counts the number of iterators needed inside a forall construct, including
6525 nested forall constructs. This is used to allocate the needed memory
6526 in gfc_resolve_forall. */
6529 gfc_count_forall_iterators (gfc_code *code)
6531 int max_iters, sub_iters, current_iters;
6532 gfc_forall_iterator *fa;
6534 gcc_assert(code->op == EXEC_FORALL);
6538 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6541 code = code->block->next;
6545 if (code->op == EXEC_FORALL)
6547 sub_iters = gfc_count_forall_iterators (code);
6548 if (sub_iters > max_iters)
6549 max_iters = sub_iters;
6554 return current_iters + max_iters;
6558 /* Given a FORALL construct, first resolve the FORALL iterator, then call
6559 gfc_resolve_forall_body to resolve the FORALL body. */
6562 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
6564 static gfc_expr **var_expr;
6565 static int total_var = 0;
6566 static int nvar = 0;
6568 gfc_forall_iterator *fa;
6573 /* Start to resolve a FORALL construct */
6574 if (forall_save == 0)
6576 /* Count the total number of FORALL index in the nested FORALL
6577 construct in order to allocate the VAR_EXPR with proper size. */
6578 total_var = gfc_count_forall_iterators (code);
6580 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
6581 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
6584 /* The information about FORALL iterator, including FORALL index start, end
6585 and stride. The FORALL index can not appear in start, end or stride. */
6586 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6588 /* Check if any outer FORALL index name is the same as the current
6590 for (i = 0; i < nvar; i++)
6592 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
6594 gfc_error ("An outer FORALL construct already has an index "
6595 "with this name %L", &fa->var->where);
6599 /* Record the current FORALL index. */
6600 var_expr[nvar] = gfc_copy_expr (fa->var);
6604 /* No memory leak. */
6605 gcc_assert (nvar <= total_var);
6608 /* Resolve the FORALL body. */
6609 gfc_resolve_forall_body (code, nvar, var_expr);
6611 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
6612 gfc_resolve_blocks (code->block, ns);
6616 /* Free only the VAR_EXPRs allocated in this frame. */
6617 for (i = nvar; i < tmp; i++)
6618 gfc_free_expr (var_expr[i]);
6622 /* We are in the outermost FORALL construct. */
6623 gcc_assert (forall_save == 0);
6625 /* VAR_EXPR is not needed any more. */
6626 gfc_free (var_expr);
6632 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL ,GOTO and
6635 static void resolve_code (gfc_code *, gfc_namespace *);
6638 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
6642 for (; b; b = b->block)
6644 t = gfc_resolve_expr (b->expr1);
6645 if (gfc_resolve_expr (b->expr2) == FAILURE)
6651 if (t == SUCCESS && b->expr1 != NULL
6652 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
6653 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
6660 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
6661 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
6666 resolve_branch (b->label1, b);
6679 case EXEC_OMP_ATOMIC:
6680 case EXEC_OMP_CRITICAL:
6682 case EXEC_OMP_MASTER:
6683 case EXEC_OMP_ORDERED:
6684 case EXEC_OMP_PARALLEL:
6685 case EXEC_OMP_PARALLEL_DO:
6686 case EXEC_OMP_PARALLEL_SECTIONS:
6687 case EXEC_OMP_PARALLEL_WORKSHARE:
6688 case EXEC_OMP_SECTIONS:
6689 case EXEC_OMP_SINGLE:
6691 case EXEC_OMP_TASKWAIT:
6692 case EXEC_OMP_WORKSHARE:
6696 gfc_internal_error ("resolve_block(): Bad block type");
6699 resolve_code (b->next, ns);
6704 /* Does everything to resolve an ordinary assignment. Returns true
6705 if this is an interface assignment. */
6707 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
6717 if (gfc_extend_assign (code, ns) == SUCCESS)
6719 lhs = code->ext.actual->expr;
6720 rhs = code->ext.actual->next->expr;
6721 if (gfc_pure (NULL) && !gfc_pure (code->symtree->n.sym))
6723 gfc_error ("Subroutine '%s' called instead of assignment at "
6724 "%L must be PURE", code->symtree->n.sym->name,
6729 /* Make a temporary rhs when there is a default initializer
6730 and rhs is the same symbol as the lhs. */
6731 if (rhs->expr_type == EXPR_VARIABLE
6732 && rhs->symtree->n.sym->ts.type == BT_DERIVED
6733 && has_default_initializer (rhs->symtree->n.sym->ts.derived)
6734 && (lhs->symtree->n.sym == rhs->symtree->n.sym))
6735 code->ext.actual->next->expr = gfc_get_parentheses (rhs);
6744 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
6745 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
6746 &code->loc) == FAILURE)
6749 /* Handle the case of a BOZ literal on the RHS. */
6750 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
6753 if (gfc_option.warn_surprising)
6754 gfc_warning ("BOZ literal at %L is bitwise transferred "
6755 "non-integer symbol '%s'", &code->loc,
6756 lhs->symtree->n.sym->name);
6758 if (!gfc_convert_boz (rhs, &lhs->ts))
6760 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
6762 if (rc == ARITH_UNDERFLOW)
6763 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
6764 ". This check can be disabled with the option "
6765 "-fno-range-check", &rhs->where);
6766 else if (rc == ARITH_OVERFLOW)
6767 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
6768 ". This check can be disabled with the option "
6769 "-fno-range-check", &rhs->where);
6770 else if (rc == ARITH_NAN)
6771 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
6772 ". This check can be disabled with the option "
6773 "-fno-range-check", &rhs->where);
6779 if (lhs->ts.type == BT_CHARACTER
6780 && gfc_option.warn_character_truncation)
6782 if (lhs->ts.cl != NULL
6783 && lhs->ts.cl->length != NULL
6784 && lhs->ts.cl->length->expr_type == EXPR_CONSTANT)
6785 llen = mpz_get_si (lhs->ts.cl->length->value.integer);
6787 if (rhs->expr_type == EXPR_CONSTANT)
6788 rlen = rhs->value.character.length;
6790 else if (rhs->ts.cl != NULL
6791 && rhs->ts.cl->length != NULL
6792 && rhs->ts.cl->length->expr_type == EXPR_CONSTANT)
6793 rlen = mpz_get_si (rhs->ts.cl->length->value.integer);
6795 if (rlen && llen && rlen > llen)
6796 gfc_warning_now ("CHARACTER expression will be truncated "
6797 "in assignment (%d/%d) at %L",
6798 llen, rlen, &code->loc);
6801 /* Ensure that a vector index expression for the lvalue is evaluated
6802 to a temporary if the lvalue symbol is referenced in it. */
6805 for (ref = lhs->ref; ref; ref= ref->next)
6806 if (ref->type == REF_ARRAY)
6808 for (n = 0; n < ref->u.ar.dimen; n++)
6809 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
6810 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
6811 ref->u.ar.start[n]))
6813 = gfc_get_parentheses (ref->u.ar.start[n]);
6817 if (gfc_pure (NULL))
6819 if (gfc_impure_variable (lhs->symtree->n.sym))
6821 gfc_error ("Cannot assign to variable '%s' in PURE "
6823 lhs->symtree->n.sym->name,
6828 if (lhs->ts.type == BT_DERIVED
6829 && lhs->expr_type == EXPR_VARIABLE
6830 && lhs->ts.derived->attr.pointer_comp
6831 && gfc_impure_variable (rhs->symtree->n.sym))
6833 gfc_error ("The impure variable at %L is assigned to "
6834 "a derived type variable with a POINTER "
6835 "component in a PURE procedure (12.6)",
6841 gfc_check_assign (lhs, rhs, 1);
6845 /* Given a block of code, recursively resolve everything pointed to by this
6849 resolve_code (gfc_code *code, gfc_namespace *ns)
6851 int omp_workshare_save;
6856 frame.prev = cs_base;
6860 find_reachable_labels (code);
6862 for (; code; code = code->next)
6864 frame.current = code;
6865 forall_save = forall_flag;
6867 if (code->op == EXEC_FORALL)
6870 gfc_resolve_forall (code, ns, forall_save);
6873 else if (code->block)
6875 omp_workshare_save = -1;
6878 case EXEC_OMP_PARALLEL_WORKSHARE:
6879 omp_workshare_save = omp_workshare_flag;
6880 omp_workshare_flag = 1;
6881 gfc_resolve_omp_parallel_blocks (code, ns);
6883 case EXEC_OMP_PARALLEL:
6884 case EXEC_OMP_PARALLEL_DO:
6885 case EXEC_OMP_PARALLEL_SECTIONS:
6887 omp_workshare_save = omp_workshare_flag;
6888 omp_workshare_flag = 0;
6889 gfc_resolve_omp_parallel_blocks (code, ns);
6892 gfc_resolve_omp_do_blocks (code, ns);
6894 case EXEC_OMP_WORKSHARE:
6895 omp_workshare_save = omp_workshare_flag;
6896 omp_workshare_flag = 1;
6899 gfc_resolve_blocks (code->block, ns);
6903 if (omp_workshare_save != -1)
6904 omp_workshare_flag = omp_workshare_save;
6908 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
6909 t = gfc_resolve_expr (code->expr1);
6910 forall_flag = forall_save;
6912 if (gfc_resolve_expr (code->expr2) == FAILURE)
6918 case EXEC_END_BLOCK:
6928 /* Keep track of which entry we are up to. */
6929 current_entry_id = code->ext.entry->id;
6933 resolve_where (code, NULL);
6937 if (code->expr1 != NULL)
6939 if (code->expr1->ts.type != BT_INTEGER)
6940 gfc_error ("ASSIGNED GOTO statement at %L requires an "
6941 "INTEGER variable", &code->expr1->where);
6942 else if (code->expr1->symtree->n.sym->attr.assign != 1)
6943 gfc_error ("Variable '%s' has not been assigned a target "
6944 "label at %L", code->expr1->symtree->n.sym->name,
6945 &code->expr1->where);
6948 resolve_branch (code->label1, code);
6952 if (code->expr1 != NULL
6953 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
6954 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
6955 "INTEGER return specifier", &code->expr1->where);
6958 case EXEC_INIT_ASSIGN:
6959 case EXEC_END_PROCEDURE:
6966 if (resolve_ordinary_assign (code, ns))
6971 case EXEC_LABEL_ASSIGN:
6972 if (code->label1->defined == ST_LABEL_UNKNOWN)
6973 gfc_error ("Label %d referenced at %L is never defined",
6974 code->label1->value, &code->label1->where);
6976 && (code->expr1->expr_type != EXPR_VARIABLE
6977 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
6978 || code->expr1->symtree->n.sym->ts.kind
6979 != gfc_default_integer_kind
6980 || code->expr1->symtree->n.sym->as != NULL))
6981 gfc_error ("ASSIGN statement at %L requires a scalar "
6982 "default INTEGER variable", &code->expr1->where);
6985 case EXEC_POINTER_ASSIGN:
6989 gfc_check_pointer_assign (code->expr1, code->expr2);
6992 case EXEC_ARITHMETIC_IF:
6994 && code->expr1->ts.type != BT_INTEGER
6995 && code->expr1->ts.type != BT_REAL)
6996 gfc_error ("Arithmetic IF statement at %L requires a numeric "
6997 "expression", &code->expr1->where);
6999 resolve_branch (code->label1, code);
7000 resolve_branch (code->label2, code);
7001 resolve_branch (code->label3, code);
7005 if (t == SUCCESS && code->expr1 != NULL
7006 && (code->expr1->ts.type != BT_LOGICAL
7007 || code->expr1->rank != 0))
7008 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7009 &code->expr1->where);
7014 resolve_call (code);
7018 resolve_typebound_call (code);
7022 resolve_ppc_call (code);
7026 /* Select is complicated. Also, a SELECT construct could be
7027 a transformed computed GOTO. */
7028 resolve_select (code);
7032 if (code->ext.iterator != NULL)
7034 gfc_iterator *iter = code->ext.iterator;
7035 if (gfc_resolve_iterator (iter, true) != FAILURE)
7036 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
7041 if (code->expr1 == NULL)
7042 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
7044 && (code->expr1->rank != 0
7045 || code->expr1->ts.type != BT_LOGICAL))
7046 gfc_error ("Exit condition of DO WHILE loop at %L must be "
7047 "a scalar LOGICAL expression", &code->expr1->where);
7052 resolve_allocate_deallocate (code, "ALLOCATE");
7056 case EXEC_DEALLOCATE:
7058 resolve_allocate_deallocate (code, "DEALLOCATE");
7063 if (gfc_resolve_open (code->ext.open) == FAILURE)
7066 resolve_branch (code->ext.open->err, code);
7070 if (gfc_resolve_close (code->ext.close) == FAILURE)
7073 resolve_branch (code->ext.close->err, code);
7076 case EXEC_BACKSPACE:
7080 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
7083 resolve_branch (code->ext.filepos->err, code);
7087 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7090 resolve_branch (code->ext.inquire->err, code);
7094 gcc_assert (code->ext.inquire != NULL);
7095 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7098 resolve_branch (code->ext.inquire->err, code);
7102 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
7105 resolve_branch (code->ext.wait->err, code);
7106 resolve_branch (code->ext.wait->end, code);
7107 resolve_branch (code->ext.wait->eor, code);
7112 if (gfc_resolve_dt (code->ext.dt) == FAILURE)
7115 resolve_branch (code->ext.dt->err, code);
7116 resolve_branch (code->ext.dt->end, code);
7117 resolve_branch (code->ext.dt->eor, code);
7121 resolve_transfer (code);
7125 resolve_forall_iterators (code->ext.forall_iterator);
7127 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
7128 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
7129 "expression", &code->expr1->where);
7132 case EXEC_OMP_ATOMIC:
7133 case EXEC_OMP_BARRIER:
7134 case EXEC_OMP_CRITICAL:
7135 case EXEC_OMP_FLUSH:
7137 case EXEC_OMP_MASTER:
7138 case EXEC_OMP_ORDERED:
7139 case EXEC_OMP_SECTIONS:
7140 case EXEC_OMP_SINGLE:
7141 case EXEC_OMP_TASKWAIT:
7142 case EXEC_OMP_WORKSHARE:
7143 gfc_resolve_omp_directive (code, ns);
7146 case EXEC_OMP_PARALLEL:
7147 case EXEC_OMP_PARALLEL_DO:
7148 case EXEC_OMP_PARALLEL_SECTIONS:
7149 case EXEC_OMP_PARALLEL_WORKSHARE:
7151 omp_workshare_save = omp_workshare_flag;
7152 omp_workshare_flag = 0;
7153 gfc_resolve_omp_directive (code, ns);
7154 omp_workshare_flag = omp_workshare_save;
7158 gfc_internal_error ("resolve_code(): Bad statement code");
7162 cs_base = frame.prev;
7166 /* Resolve initial values and make sure they are compatible with
7170 resolve_values (gfc_symbol *sym)
7172 if (sym->value == NULL)
7175 if (gfc_resolve_expr (sym->value) == FAILURE)
7178 gfc_check_assign_symbol (sym, sym->value);
7182 /* Verify the binding labels for common blocks that are BIND(C). The label
7183 for a BIND(C) common block must be identical in all scoping units in which
7184 the common block is declared. Further, the binding label can not collide
7185 with any other global entity in the program. */
7188 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
7190 if (comm_block_tree->n.common->is_bind_c == 1)
7192 gfc_gsymbol *binding_label_gsym;
7193 gfc_gsymbol *comm_name_gsym;
7195 /* See if a global symbol exists by the common block's name. It may
7196 be NULL if the common block is use-associated. */
7197 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
7198 comm_block_tree->n.common->name);
7199 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
7200 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
7201 "with the global entity '%s' at %L",
7202 comm_block_tree->n.common->binding_label,
7203 comm_block_tree->n.common->name,
7204 &(comm_block_tree->n.common->where),
7205 comm_name_gsym->name, &(comm_name_gsym->where));
7206 else if (comm_name_gsym != NULL
7207 && strcmp (comm_name_gsym->name,
7208 comm_block_tree->n.common->name) == 0)
7210 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
7212 if (comm_name_gsym->binding_label == NULL)
7213 /* No binding label for common block stored yet; save this one. */
7214 comm_name_gsym->binding_label =
7215 comm_block_tree->n.common->binding_label;
7217 if (strcmp (comm_name_gsym->binding_label,
7218 comm_block_tree->n.common->binding_label) != 0)
7220 /* Common block names match but binding labels do not. */
7221 gfc_error ("Binding label '%s' for common block '%s' at %L "
7222 "does not match the binding label '%s' for common "
7224 comm_block_tree->n.common->binding_label,
7225 comm_block_tree->n.common->name,
7226 &(comm_block_tree->n.common->where),
7227 comm_name_gsym->binding_label,
7228 comm_name_gsym->name,
7229 &(comm_name_gsym->where));
7234 /* There is no binding label (NAME="") so we have nothing further to
7235 check and nothing to add as a global symbol for the label. */
7236 if (comm_block_tree->n.common->binding_label[0] == '\0' )
7239 binding_label_gsym =
7240 gfc_find_gsymbol (gfc_gsym_root,
7241 comm_block_tree->n.common->binding_label);
7242 if (binding_label_gsym == NULL)
7244 /* Need to make a global symbol for the binding label to prevent
7245 it from colliding with another. */
7246 binding_label_gsym =
7247 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
7248 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
7249 binding_label_gsym->type = GSYM_COMMON;
7253 /* If comm_name_gsym is NULL, the name common block is use
7254 associated and the name could be colliding. */
7255 if (binding_label_gsym->type != GSYM_COMMON)
7256 gfc_error ("Binding label '%s' for common block '%s' at %L "
7257 "collides with the global entity '%s' at %L",
7258 comm_block_tree->n.common->binding_label,
7259 comm_block_tree->n.common->name,
7260 &(comm_block_tree->n.common->where),
7261 binding_label_gsym->name,
7262 &(binding_label_gsym->where));
7263 else if (comm_name_gsym != NULL
7264 && (strcmp (binding_label_gsym->name,
7265 comm_name_gsym->binding_label) != 0)
7266 && (strcmp (binding_label_gsym->sym_name,
7267 comm_name_gsym->name) != 0))
7268 gfc_error ("Binding label '%s' for common block '%s' at %L "
7269 "collides with global entity '%s' at %L",
7270 binding_label_gsym->name, binding_label_gsym->sym_name,
7271 &(comm_block_tree->n.common->where),
7272 comm_name_gsym->name, &(comm_name_gsym->where));
7280 /* Verify any BIND(C) derived types in the namespace so we can report errors
7281 for them once, rather than for each variable declared of that type. */
7284 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
7286 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
7287 && derived_sym->attr.is_bind_c == 1)
7288 verify_bind_c_derived_type (derived_sym);
7294 /* Verify that any binding labels used in a given namespace do not collide
7295 with the names or binding labels of any global symbols. */
7298 gfc_verify_binding_labels (gfc_symbol *sym)
7302 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
7303 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
7305 gfc_gsymbol *bind_c_sym;
7307 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
7308 if (bind_c_sym != NULL
7309 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
7311 if (sym->attr.if_source == IFSRC_DECL
7312 && (bind_c_sym->type != GSYM_SUBROUTINE
7313 && bind_c_sym->type != GSYM_FUNCTION)
7314 && ((sym->attr.contained == 1
7315 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
7316 || (sym->attr.use_assoc == 1
7317 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
7319 /* Make sure global procedures don't collide with anything. */
7320 gfc_error ("Binding label '%s' at %L collides with the global "
7321 "entity '%s' at %L", sym->binding_label,
7322 &(sym->declared_at), bind_c_sym->name,
7323 &(bind_c_sym->where));
7326 else if (sym->attr.contained == 0
7327 && (sym->attr.if_source == IFSRC_IFBODY
7328 && sym->attr.flavor == FL_PROCEDURE)
7329 && (bind_c_sym->sym_name != NULL
7330 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
7332 /* Make sure procedures in interface bodies don't collide. */
7333 gfc_error ("Binding label '%s' in interface body at %L collides "
7334 "with the global entity '%s' at %L",
7336 &(sym->declared_at), bind_c_sym->name,
7337 &(bind_c_sym->where));
7340 else if (sym->attr.contained == 0
7341 && sym->attr.if_source == IFSRC_UNKNOWN)
7342 if ((sym->attr.use_assoc && bind_c_sym->mod_name
7343 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
7344 || sym->attr.use_assoc == 0)
7346 gfc_error ("Binding label '%s' at %L collides with global "
7347 "entity '%s' at %L", sym->binding_label,
7348 &(sym->declared_at), bind_c_sym->name,
7349 &(bind_c_sym->where));
7354 /* Clear the binding label to prevent checking multiple times. */
7355 sym->binding_label[0] = '\0';
7357 else if (bind_c_sym == NULL)
7359 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
7360 bind_c_sym->where = sym->declared_at;
7361 bind_c_sym->sym_name = sym->name;
7363 if (sym->attr.use_assoc == 1)
7364 bind_c_sym->mod_name = sym->module;
7366 if (sym->ns->proc_name != NULL)
7367 bind_c_sym->mod_name = sym->ns->proc_name->name;
7369 if (sym->attr.contained == 0)
7371 if (sym->attr.subroutine)
7372 bind_c_sym->type = GSYM_SUBROUTINE;
7373 else if (sym->attr.function)
7374 bind_c_sym->type = GSYM_FUNCTION;
7382 /* Resolve an index expression. */
7385 resolve_index_expr (gfc_expr *e)
7387 if (gfc_resolve_expr (e) == FAILURE)
7390 if (gfc_simplify_expr (e, 0) == FAILURE)
7393 if (gfc_specification_expr (e) == FAILURE)
7399 /* Resolve a charlen structure. */
7402 resolve_charlen (gfc_charlen *cl)
7411 specification_expr = 1;
7413 if (resolve_index_expr (cl->length) == FAILURE)
7415 specification_expr = 0;
7419 /* "If the character length parameter value evaluates to a negative
7420 value, the length of character entities declared is zero." */
7421 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
7423 gfc_warning_now ("CHARACTER variable has zero length at %L",
7424 &cl->length->where);
7425 gfc_replace_expr (cl->length, gfc_int_expr (0));
7428 /* Check that the character length is not too large. */
7429 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
7430 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
7431 && cl->length->ts.type == BT_INTEGER
7432 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
7434 gfc_error ("String length at %L is too large", &cl->length->where);
7442 /* Test for non-constant shape arrays. */
7445 is_non_constant_shape_array (gfc_symbol *sym)
7451 not_constant = false;
7452 if (sym->as != NULL)
7454 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
7455 has not been simplified; parameter array references. Do the
7456 simplification now. */
7457 for (i = 0; i < sym->as->rank; i++)
7459 e = sym->as->lower[i];
7460 if (e && (resolve_index_expr (e) == FAILURE
7461 || !gfc_is_constant_expr (e)))
7462 not_constant = true;
7464 e = sym->as->upper[i];
7465 if (e && (resolve_index_expr (e) == FAILURE
7466 || !gfc_is_constant_expr (e)))
7467 not_constant = true;
7470 return not_constant;
7473 /* Given a symbol and an initialization expression, add code to initialize
7474 the symbol to the function entry. */
7476 build_init_assign (gfc_symbol *sym, gfc_expr *init)
7480 gfc_namespace *ns = sym->ns;
7482 /* Search for the function namespace if this is a contained
7483 function without an explicit result. */
7484 if (sym->attr.function && sym == sym->result
7485 && sym->name != sym->ns->proc_name->name)
7488 for (;ns; ns = ns->sibling)
7489 if (strcmp (ns->proc_name->name, sym->name) == 0)
7495 gfc_free_expr (init);
7499 /* Build an l-value expression for the result. */
7500 lval = gfc_lval_expr_from_sym (sym);
7502 /* Add the code at scope entry. */
7503 init_st = gfc_get_code ();
7504 init_st->next = ns->code;
7507 /* Assign the default initializer to the l-value. */
7508 init_st->loc = sym->declared_at;
7509 init_st->op = EXEC_INIT_ASSIGN;
7510 init_st->expr1 = lval;
7511 init_st->expr2 = init;
7514 /* Assign the default initializer to a derived type variable or result. */
7517 apply_default_init (gfc_symbol *sym)
7519 gfc_expr *init = NULL;
7521 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7524 if (sym->ts.type == BT_DERIVED && sym->ts.derived)
7525 init = gfc_default_initializer (&sym->ts);
7530 build_init_assign (sym, init);
7533 /* Build an initializer for a local integer, real, complex, logical, or
7534 character variable, based on the command line flags finit-local-zero,
7535 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
7536 null if the symbol should not have a default initialization. */
7538 build_default_init_expr (gfc_symbol *sym)
7541 gfc_expr *init_expr;
7544 /* These symbols should never have a default initialization. */
7545 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
7546 || sym->attr.external
7548 || sym->attr.pointer
7549 || sym->attr.in_equivalence
7550 || sym->attr.in_common
7553 || sym->attr.cray_pointee
7554 || sym->attr.cray_pointer)
7557 /* Now we'll try to build an initializer expression. */
7558 init_expr = gfc_get_expr ();
7559 init_expr->expr_type = EXPR_CONSTANT;
7560 init_expr->ts.type = sym->ts.type;
7561 init_expr->ts.kind = sym->ts.kind;
7562 init_expr->where = sym->declared_at;
7564 /* We will only initialize integers, reals, complex, logicals, and
7565 characters, and only if the corresponding command-line flags
7566 were set. Otherwise, we free init_expr and return null. */
7567 switch (sym->ts.type)
7570 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
7571 mpz_init_set_si (init_expr->value.integer,
7572 gfc_option.flag_init_integer_value);
7575 gfc_free_expr (init_expr);
7581 mpfr_init (init_expr->value.real);
7582 switch (gfc_option.flag_init_real)
7584 case GFC_INIT_REAL_SNAN:
7585 init_expr->is_snan = 1;
7587 case GFC_INIT_REAL_NAN:
7588 mpfr_set_nan (init_expr->value.real);
7591 case GFC_INIT_REAL_INF:
7592 mpfr_set_inf (init_expr->value.real, 1);
7595 case GFC_INIT_REAL_NEG_INF:
7596 mpfr_set_inf (init_expr->value.real, -1);
7599 case GFC_INIT_REAL_ZERO:
7600 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
7604 gfc_free_expr (init_expr);
7611 mpfr_init (init_expr->value.complex.r);
7612 mpfr_init (init_expr->value.complex.i);
7613 switch (gfc_option.flag_init_real)
7615 case GFC_INIT_REAL_SNAN:
7616 init_expr->is_snan = 1;
7618 case GFC_INIT_REAL_NAN:
7619 mpfr_set_nan (init_expr->value.complex.r);
7620 mpfr_set_nan (init_expr->value.complex.i);
7623 case GFC_INIT_REAL_INF:
7624 mpfr_set_inf (init_expr->value.complex.r, 1);
7625 mpfr_set_inf (init_expr->value.complex.i, 1);
7628 case GFC_INIT_REAL_NEG_INF:
7629 mpfr_set_inf (init_expr->value.complex.r, -1);
7630 mpfr_set_inf (init_expr->value.complex.i, -1);
7633 case GFC_INIT_REAL_ZERO:
7634 mpfr_set_ui (init_expr->value.complex.r, 0.0, GFC_RND_MODE);
7635 mpfr_set_ui (init_expr->value.complex.i, 0.0, GFC_RND_MODE);
7639 gfc_free_expr (init_expr);
7646 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
7647 init_expr->value.logical = 0;
7648 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
7649 init_expr->value.logical = 1;
7652 gfc_free_expr (init_expr);
7658 /* For characters, the length must be constant in order to
7659 create a default initializer. */
7660 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
7661 && sym->ts.cl->length
7662 && sym->ts.cl->length->expr_type == EXPR_CONSTANT)
7664 char_len = mpz_get_si (sym->ts.cl->length->value.integer);
7665 init_expr->value.character.length = char_len;
7666 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
7667 for (i = 0; i < char_len; i++)
7668 init_expr->value.character.string[i]
7669 = (unsigned char) gfc_option.flag_init_character_value;
7673 gfc_free_expr (init_expr);
7679 gfc_free_expr (init_expr);
7685 /* Add an initialization expression to a local variable. */
7687 apply_default_init_local (gfc_symbol *sym)
7689 gfc_expr *init = NULL;
7691 /* The symbol should be a variable or a function return value. */
7692 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7693 || (sym->attr.function && sym->result != sym))
7696 /* Try to build the initializer expression. If we can't initialize
7697 this symbol, then init will be NULL. */
7698 init = build_default_init_expr (sym);
7702 /* For saved variables, we don't want to add an initializer at
7703 function entry, so we just add a static initializer. */
7704 if (sym->attr.save || sym->ns->save_all)
7706 /* Don't clobber an existing initializer! */
7707 gcc_assert (sym->value == NULL);
7712 build_init_assign (sym, init);
7715 /* Resolution of common features of flavors variable and procedure. */
7718 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
7720 /* Constraints on deferred shape variable. */
7721 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
7723 if (sym->attr.allocatable)
7725 if (sym->attr.dimension)
7726 gfc_error ("Allocatable array '%s' at %L must have "
7727 "a deferred shape", sym->name, &sym->declared_at);
7729 gfc_error ("Scalar object '%s' at %L may not be ALLOCATABLE",
7730 sym->name, &sym->declared_at);
7734 if (sym->attr.pointer && sym->attr.dimension)
7736 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
7737 sym->name, &sym->declared_at);
7744 if (!mp_flag && !sym->attr.allocatable
7745 && !sym->attr.pointer && !sym->attr.dummy)
7747 gfc_error ("Array '%s' at %L cannot have a deferred shape",
7748 sym->name, &sym->declared_at);
7756 /* Additional checks for symbols with flavor variable and derived
7757 type. To be called from resolve_fl_variable. */
7760 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
7762 gcc_assert (sym->ts.type == BT_DERIVED);
7764 /* Check to see if a derived type is blocked from being host
7765 associated by the presence of another class I symbol in the same
7766 namespace. 14.6.1.3 of the standard and the discussion on
7767 comp.lang.fortran. */
7768 if (sym->ns != sym->ts.derived->ns
7769 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
7772 gfc_find_symbol (sym->ts.derived->name, sym->ns, 0, &s);
7773 if (s && s->attr.flavor != FL_DERIVED)
7775 gfc_error ("The type '%s' cannot be host associated at %L "
7776 "because it is blocked by an incompatible object "
7777 "of the same name declared at %L",
7778 sym->ts.derived->name, &sym->declared_at,
7784 /* 4th constraint in section 11.3: "If an object of a type for which
7785 component-initialization is specified (R429) appears in the
7786 specification-part of a module and does not have the ALLOCATABLE
7787 or POINTER attribute, the object shall have the SAVE attribute."
7789 The check for initializers is performed with
7790 has_default_initializer because gfc_default_initializer generates
7791 a hidden default for allocatable components. */
7792 if (!(sym->value || no_init_flag) && sym->ns->proc_name
7793 && sym->ns->proc_name->attr.flavor == FL_MODULE
7794 && !sym->ns->save_all && !sym->attr.save
7795 && !sym->attr.pointer && !sym->attr.allocatable
7796 && has_default_initializer (sym->ts.derived))
7798 gfc_error("Object '%s' at %L must have the SAVE attribute for "
7799 "default initialization of a component",
7800 sym->name, &sym->declared_at);
7804 /* Assign default initializer. */
7805 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
7806 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
7808 sym->value = gfc_default_initializer (&sym->ts);
7815 /* Resolve symbols with flavor variable. */
7818 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
7820 int no_init_flag, automatic_flag;
7822 const char *auto_save_msg;
7824 auto_save_msg = "Automatic object '%s' at %L cannot have the "
7827 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
7830 /* Set this flag to check that variables are parameters of all entries.
7831 This check is effected by the call to gfc_resolve_expr through
7832 is_non_constant_shape_array. */
7833 specification_expr = 1;
7835 if (sym->ns->proc_name
7836 && (sym->ns->proc_name->attr.flavor == FL_MODULE
7837 || sym->ns->proc_name->attr.is_main_program)
7838 && !sym->attr.use_assoc
7839 && !sym->attr.allocatable
7840 && !sym->attr.pointer
7841 && is_non_constant_shape_array (sym))
7843 /* The shape of a main program or module array needs to be
7845 gfc_error ("The module or main program array '%s' at %L must "
7846 "have constant shape", sym->name, &sym->declared_at);
7847 specification_expr = 0;
7851 if (sym->ts.type == BT_CHARACTER)
7853 /* Make sure that character string variables with assumed length are
7855 e = sym->ts.cl->length;
7856 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
7858 gfc_error ("Entity with assumed character length at %L must be a "
7859 "dummy argument or a PARAMETER", &sym->declared_at);
7863 if (e && sym->attr.save && !gfc_is_constant_expr (e))
7865 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
7869 if (!gfc_is_constant_expr (e)
7870 && !(e->expr_type == EXPR_VARIABLE
7871 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
7872 && sym->ns->proc_name
7873 && (sym->ns->proc_name->attr.flavor == FL_MODULE
7874 || sym->ns->proc_name->attr.is_main_program)
7875 && !sym->attr.use_assoc)
7877 gfc_error ("'%s' at %L must have constant character length "
7878 "in this context", sym->name, &sym->declared_at);
7883 if (sym->value == NULL && sym->attr.referenced)
7884 apply_default_init_local (sym); /* Try to apply a default initialization. */
7886 /* Determine if the symbol may not have an initializer. */
7887 no_init_flag = automatic_flag = 0;
7888 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
7889 || sym->attr.intrinsic || sym->attr.result)
7891 else if (sym->attr.dimension && !sym->attr.pointer
7892 && is_non_constant_shape_array (sym))
7894 no_init_flag = automatic_flag = 1;
7896 /* Also, they must not have the SAVE attribute.
7897 SAVE_IMPLICIT is checked below. */
7898 if (sym->attr.save == SAVE_EXPLICIT)
7900 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
7905 /* Ensure that any initializer is simplified. */
7907 gfc_simplify_expr (sym->value, 1);
7909 /* Reject illegal initializers. */
7910 if (!sym->mark && sym->value)
7912 if (sym->attr.allocatable)
7913 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
7914 sym->name, &sym->declared_at);
7915 else if (sym->attr.external)
7916 gfc_error ("External '%s' at %L cannot have an initializer",
7917 sym->name, &sym->declared_at);
7918 else if (sym->attr.dummy
7919 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
7920 gfc_error ("Dummy '%s' at %L cannot have an initializer",
7921 sym->name, &sym->declared_at);
7922 else if (sym->attr.intrinsic)
7923 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
7924 sym->name, &sym->declared_at);
7925 else if (sym->attr.result)
7926 gfc_error ("Function result '%s' at %L cannot have an initializer",
7927 sym->name, &sym->declared_at);
7928 else if (automatic_flag)
7929 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
7930 sym->name, &sym->declared_at);
7937 if (sym->ts.type == BT_DERIVED)
7938 return resolve_fl_variable_derived (sym, no_init_flag);
7944 /* Resolve a procedure. */
7947 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
7949 gfc_formal_arglist *arg;
7951 if (sym->attr.ambiguous_interfaces && !sym->attr.referenced)
7952 gfc_warning ("Although not referenced, '%s' at %L has ambiguous "
7953 "interfaces", sym->name, &sym->declared_at);
7955 if (sym->attr.function
7956 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
7959 if (sym->ts.type == BT_CHARACTER)
7961 gfc_charlen *cl = sym->ts.cl;
7963 if (cl && cl->length && gfc_is_constant_expr (cl->length)
7964 && resolve_charlen (cl) == FAILURE)
7967 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
7969 if (sym->attr.proc == PROC_ST_FUNCTION)
7971 gfc_error ("Character-valued statement function '%s' at %L must "
7972 "have constant length", sym->name, &sym->declared_at);
7976 if (sym->attr.external && sym->formal == NULL
7977 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
7979 gfc_error ("Automatic character length function '%s' at %L must "
7980 "have an explicit interface", sym->name,
7987 /* Ensure that derived type for are not of a private type. Internal
7988 module procedures are excluded by 2.2.3.3 - i.e., they are not
7989 externally accessible and can access all the objects accessible in
7991 if (!(sym->ns->parent
7992 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
7993 && gfc_check_access(sym->attr.access, sym->ns->default_access))
7995 gfc_interface *iface;
7997 for (arg = sym->formal; arg; arg = arg->next)
8000 && arg->sym->ts.type == BT_DERIVED
8001 && !arg->sym->ts.derived->attr.use_assoc
8002 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8003 arg->sym->ts.derived->ns->default_access)
8004 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
8005 "PRIVATE type and cannot be a dummy argument"
8006 " of '%s', which is PUBLIC at %L",
8007 arg->sym->name, sym->name, &sym->declared_at)
8010 /* Stop this message from recurring. */
8011 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8016 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8017 PRIVATE to the containing module. */
8018 for (iface = sym->generic; iface; iface = iface->next)
8020 for (arg = iface->sym->formal; arg; arg = arg->next)
8023 && arg->sym->ts.type == BT_DERIVED
8024 && !arg->sym->ts.derived->attr.use_assoc
8025 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8026 arg->sym->ts.derived->ns->default_access)
8027 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8028 "'%s' in PUBLIC interface '%s' at %L "
8029 "takes dummy arguments of '%s' which is "
8030 "PRIVATE", iface->sym->name, sym->name,
8031 &iface->sym->declared_at,
8032 gfc_typename (&arg->sym->ts)) == FAILURE)
8034 /* Stop this message from recurring. */
8035 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8041 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8042 PRIVATE to the containing module. */
8043 for (iface = sym->generic; iface; iface = iface->next)
8045 for (arg = iface->sym->formal; arg; arg = arg->next)
8048 && arg->sym->ts.type == BT_DERIVED
8049 && !arg->sym->ts.derived->attr.use_assoc
8050 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8051 arg->sym->ts.derived->ns->default_access)
8052 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8053 "'%s' in PUBLIC interface '%s' at %L "
8054 "takes dummy arguments of '%s' which is "
8055 "PRIVATE", iface->sym->name, sym->name,
8056 &iface->sym->declared_at,
8057 gfc_typename (&arg->sym->ts)) == FAILURE)
8059 /* Stop this message from recurring. */
8060 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8067 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
8068 && !sym->attr.proc_pointer)
8070 gfc_error ("Function '%s' at %L cannot have an initializer",
8071 sym->name, &sym->declared_at);
8075 /* An external symbol may not have an initializer because it is taken to be
8076 a procedure. Exception: Procedure Pointers. */
8077 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
8079 gfc_error ("External object '%s' at %L may not have an initializer",
8080 sym->name, &sym->declared_at);
8084 /* An elemental function is required to return a scalar 12.7.1 */
8085 if (sym->attr.elemental && sym->attr.function && sym->as)
8087 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
8088 "result", sym->name, &sym->declared_at);
8089 /* Reset so that the error only occurs once. */
8090 sym->attr.elemental = 0;
8094 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
8095 char-len-param shall not be array-valued, pointer-valued, recursive
8096 or pure. ....snip... A character value of * may only be used in the
8097 following ways: (i) Dummy arg of procedure - dummy associates with
8098 actual length; (ii) To declare a named constant; or (iii) External
8099 function - but length must be declared in calling scoping unit. */
8100 if (sym->attr.function
8101 && sym->ts.type == BT_CHARACTER
8102 && sym->ts.cl && sym->ts.cl->length == NULL)
8104 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
8105 || (sym->attr.recursive) || (sym->attr.pure))
8107 if (sym->as && sym->as->rank)
8108 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8109 "array-valued", sym->name, &sym->declared_at);
8111 if (sym->attr.pointer)
8112 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8113 "pointer-valued", sym->name, &sym->declared_at);
8116 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8117 "pure", sym->name, &sym->declared_at);
8119 if (sym->attr.recursive)
8120 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8121 "recursive", sym->name, &sym->declared_at);
8126 /* Appendix B.2 of the standard. Contained functions give an
8127 error anyway. Fixed-form is likely to be F77/legacy. */
8128 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
8129 gfc_notify_std (GFC_STD_F95_OBS, "CHARACTER(*) function "
8130 "'%s' at %L is obsolescent in fortran 95",
8131 sym->name, &sym->declared_at);
8134 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
8136 gfc_formal_arglist *curr_arg;
8137 int has_non_interop_arg = 0;
8139 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
8140 sym->common_block) == FAILURE)
8142 /* Clear these to prevent looking at them again if there was an
8144 sym->attr.is_bind_c = 0;
8145 sym->attr.is_c_interop = 0;
8146 sym->ts.is_c_interop = 0;
8150 /* So far, no errors have been found. */
8151 sym->attr.is_c_interop = 1;
8152 sym->ts.is_c_interop = 1;
8155 curr_arg = sym->formal;
8156 while (curr_arg != NULL)
8158 /* Skip implicitly typed dummy args here. */
8159 if (curr_arg->sym->attr.implicit_type == 0)
8160 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
8161 /* If something is found to fail, record the fact so we
8162 can mark the symbol for the procedure as not being
8163 BIND(C) to try and prevent multiple errors being
8165 has_non_interop_arg = 1;
8167 curr_arg = curr_arg->next;
8170 /* See if any of the arguments were not interoperable and if so, clear
8171 the procedure symbol to prevent duplicate error messages. */
8172 if (has_non_interop_arg != 0)
8174 sym->attr.is_c_interop = 0;
8175 sym->ts.is_c_interop = 0;
8176 sym->attr.is_bind_c = 0;
8180 if (!sym->attr.proc_pointer)
8182 if (sym->attr.save == SAVE_EXPLICIT)
8184 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
8185 "in '%s' at %L", sym->name, &sym->declared_at);
8188 if (sym->attr.intent)
8190 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
8191 "in '%s' at %L", sym->name, &sym->declared_at);
8194 if (sym->attr.subroutine && sym->attr.result)
8196 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
8197 "in '%s' at %L", sym->name, &sym->declared_at);
8200 if (sym->attr.external && sym->attr.function
8201 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
8202 || sym->attr.contained))
8204 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
8205 "in '%s' at %L", sym->name, &sym->declared_at);
8208 if (strcmp ("ppr@", sym->name) == 0)
8210 gfc_error ("Procedure pointer result '%s' at %L "
8211 "is missing the pointer attribute",
8212 sym->ns->proc_name->name, &sym->declared_at);
8221 /* Resolve a list of finalizer procedures. That is, after they have hopefully
8222 been defined and we now know their defined arguments, check that they fulfill
8223 the requirements of the standard for procedures used as finalizers. */
8226 gfc_resolve_finalizers (gfc_symbol* derived)
8228 gfc_finalizer* list;
8229 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
8230 gfc_try result = SUCCESS;
8231 bool seen_scalar = false;
8233 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
8236 /* Walk over the list of finalizer-procedures, check them, and if any one
8237 does not fit in with the standard's definition, print an error and remove
8238 it from the list. */
8239 prev_link = &derived->f2k_derived->finalizers;
8240 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
8246 /* Skip this finalizer if we already resolved it. */
8247 if (list->proc_tree)
8249 prev_link = &(list->next);
8253 /* Check this exists and is a SUBROUTINE. */
8254 if (!list->proc_sym->attr.subroutine)
8256 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
8257 list->proc_sym->name, &list->where);
8261 /* We should have exactly one argument. */
8262 if (!list->proc_sym->formal || list->proc_sym->formal->next)
8264 gfc_error ("FINAL procedure at %L must have exactly one argument",
8268 arg = list->proc_sym->formal->sym;
8270 /* This argument must be of our type. */
8271 if (arg->ts.type != BT_DERIVED || arg->ts.derived != derived)
8273 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
8274 &arg->declared_at, derived->name);
8278 /* It must neither be a pointer nor allocatable nor optional. */
8279 if (arg->attr.pointer)
8281 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
8285 if (arg->attr.allocatable)
8287 gfc_error ("Argument of FINAL procedure at %L must not be"
8288 " ALLOCATABLE", &arg->declared_at);
8291 if (arg->attr.optional)
8293 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
8298 /* It must not be INTENT(OUT). */
8299 if (arg->attr.intent == INTENT_OUT)
8301 gfc_error ("Argument of FINAL procedure at %L must not be"
8302 " INTENT(OUT)", &arg->declared_at);
8306 /* Warn if the procedure is non-scalar and not assumed shape. */
8307 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
8308 && arg->as->type != AS_ASSUMED_SHAPE)
8309 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
8310 " shape argument", &arg->declared_at);
8312 /* Check that it does not match in kind and rank with a FINAL procedure
8313 defined earlier. To really loop over the *earlier* declarations,
8314 we need to walk the tail of the list as new ones were pushed at the
8316 /* TODO: Handle kind parameters once they are implemented. */
8317 my_rank = (arg->as ? arg->as->rank : 0);
8318 for (i = list->next; i; i = i->next)
8320 /* Argument list might be empty; that is an error signalled earlier,
8321 but we nevertheless continued resolving. */
8322 if (i->proc_sym->formal)
8324 gfc_symbol* i_arg = i->proc_sym->formal->sym;
8325 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
8326 if (i_rank == my_rank)
8328 gfc_error ("FINAL procedure '%s' declared at %L has the same"
8329 " rank (%d) as '%s'",
8330 list->proc_sym->name, &list->where, my_rank,
8337 /* Is this the/a scalar finalizer procedure? */
8338 if (!arg->as || arg->as->rank == 0)
8341 /* Find the symtree for this procedure. */
8342 gcc_assert (!list->proc_tree);
8343 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
8345 prev_link = &list->next;
8348 /* Remove wrong nodes immediately from the list so we don't risk any
8349 troubles in the future when they might fail later expectations. */
8353 *prev_link = list->next;
8354 gfc_free_finalizer (i);
8357 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
8358 were nodes in the list, must have been for arrays. It is surely a good
8359 idea to have a scalar version there if there's something to finalize. */
8360 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
8361 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
8362 " defined at %L, suggest also scalar one",
8363 derived->name, &derived->declared_at);
8365 /* TODO: Remove this error when finalization is finished. */
8366 gfc_error ("Finalization at %L is not yet implemented",
8367 &derived->declared_at);
8373 /* Check that it is ok for the typebound procedure proc to override the
8377 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
8380 const gfc_symbol* proc_target;
8381 const gfc_symbol* old_target;
8382 unsigned proc_pass_arg, old_pass_arg, argpos;
8383 gfc_formal_arglist* proc_formal;
8384 gfc_formal_arglist* old_formal;
8386 /* This procedure should only be called for non-GENERIC proc. */
8387 gcc_assert (!proc->n.tb->is_generic);
8389 /* If the overwritten procedure is GENERIC, this is an error. */
8390 if (old->n.tb->is_generic)
8392 gfc_error ("Can't overwrite GENERIC '%s' at %L",
8393 old->name, &proc->n.tb->where);
8397 where = proc->n.tb->where;
8398 proc_target = proc->n.tb->u.specific->n.sym;
8399 old_target = old->n.tb->u.specific->n.sym;
8401 /* Check that overridden binding is not NON_OVERRIDABLE. */
8402 if (old->n.tb->non_overridable)
8404 gfc_error ("'%s' at %L overrides a procedure binding declared"
8405 " NON_OVERRIDABLE", proc->name, &where);
8409 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
8410 if (!old->n.tb->deferred && proc->n.tb->deferred)
8412 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
8413 " non-DEFERRED binding", proc->name, &where);
8417 /* If the overridden binding is PURE, the overriding must be, too. */
8418 if (old_target->attr.pure && !proc_target->attr.pure)
8420 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
8421 proc->name, &where);
8425 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
8426 is not, the overriding must not be either. */
8427 if (old_target->attr.elemental && !proc_target->attr.elemental)
8429 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
8430 " ELEMENTAL", proc->name, &where);
8433 if (!old_target->attr.elemental && proc_target->attr.elemental)
8435 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
8436 " be ELEMENTAL, either", proc->name, &where);
8440 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
8442 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
8444 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
8445 " SUBROUTINE", proc->name, &where);
8449 /* If the overridden binding is a FUNCTION, the overriding must also be a
8450 FUNCTION and have the same characteristics. */
8451 if (old_target->attr.function)
8453 if (!proc_target->attr.function)
8455 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
8456 " FUNCTION", proc->name, &where);
8460 /* FIXME: Do more comprehensive checking (including, for instance, the
8461 rank and array-shape). */
8462 gcc_assert (proc_target->result && old_target->result);
8463 if (!gfc_compare_types (&proc_target->result->ts,
8464 &old_target->result->ts))
8466 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
8467 " matching result types", proc->name, &where);
8472 /* If the overridden binding is PUBLIC, the overriding one must not be
8474 if (old->n.tb->access == ACCESS_PUBLIC
8475 && proc->n.tb->access == ACCESS_PRIVATE)
8477 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
8478 " PRIVATE", proc->name, &where);
8482 /* Compare the formal argument lists of both procedures. This is also abused
8483 to find the position of the passed-object dummy arguments of both
8484 bindings as at least the overridden one might not yet be resolved and we
8485 need those positions in the check below. */
8486 proc_pass_arg = old_pass_arg = 0;
8487 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
8489 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
8492 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
8493 proc_formal && old_formal;
8494 proc_formal = proc_formal->next, old_formal = old_formal->next)
8496 if (proc->n.tb->pass_arg
8497 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
8498 proc_pass_arg = argpos;
8499 if (old->n.tb->pass_arg
8500 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
8501 old_pass_arg = argpos;
8503 /* Check that the names correspond. */
8504 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
8506 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
8507 " to match the corresponding argument of the overridden"
8508 " procedure", proc_formal->sym->name, proc->name, &where,
8509 old_formal->sym->name);
8513 /* Check that the types correspond if neither is the passed-object
8515 /* FIXME: Do more comprehensive testing here. */
8516 if (proc_pass_arg != argpos && old_pass_arg != argpos
8517 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
8519 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L in"
8520 " in respect to the overridden procedure",
8521 proc_formal->sym->name, proc->name, &where);
8527 if (proc_formal || old_formal)
8529 gfc_error ("'%s' at %L must have the same number of formal arguments as"
8530 " the overridden procedure", proc->name, &where);
8534 /* If the overridden binding is NOPASS, the overriding one must also be
8536 if (old->n.tb->nopass && !proc->n.tb->nopass)
8538 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
8539 " NOPASS", proc->name, &where);
8543 /* If the overridden binding is PASS(x), the overriding one must also be
8544 PASS and the passed-object dummy arguments must correspond. */
8545 if (!old->n.tb->nopass)
8547 if (proc->n.tb->nopass)
8549 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
8550 " PASS", proc->name, &where);
8554 if (proc_pass_arg != old_pass_arg)
8556 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
8557 " the same position as the passed-object dummy argument of"
8558 " the overridden procedure", proc->name, &where);
8567 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
8570 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
8571 const char* generic_name, locus where)
8576 gcc_assert (t1->specific && t2->specific);
8577 gcc_assert (!t1->specific->is_generic);
8578 gcc_assert (!t2->specific->is_generic);
8580 sym1 = t1->specific->u.specific->n.sym;
8581 sym2 = t2->specific->u.specific->n.sym;
8583 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
8584 if (sym1->attr.subroutine != sym2->attr.subroutine
8585 || sym1->attr.function != sym2->attr.function)
8587 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
8588 " GENERIC '%s' at %L",
8589 sym1->name, sym2->name, generic_name, &where);
8593 /* Compare the interfaces. */
8594 if (gfc_compare_interfaces (sym1, sym2, 1, 0))
8596 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
8597 sym1->name, sym2->name, generic_name, &where);
8605 /* Resolve a GENERIC procedure binding for a derived type. */
8608 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
8610 gfc_tbp_generic* target;
8611 gfc_symtree* first_target;
8612 gfc_symbol* super_type;
8613 gfc_symtree* inherited;
8616 gcc_assert (st->n.tb);
8617 gcc_assert (st->n.tb->is_generic);
8619 where = st->n.tb->where;
8620 super_type = gfc_get_derived_super_type (derived);
8622 /* Find the overridden binding if any. */
8623 st->n.tb->overridden = NULL;
8626 gfc_symtree* overridden;
8627 overridden = gfc_find_typebound_proc (super_type, NULL, st->name, true);
8629 if (overridden && overridden->n.tb)
8630 st->n.tb->overridden = overridden->n.tb;
8633 /* Try to find the specific bindings for the symtrees in our target-list. */
8634 gcc_assert (st->n.tb->u.generic);
8635 for (target = st->n.tb->u.generic; target; target = target->next)
8636 if (!target->specific)
8638 gfc_typebound_proc* overridden_tbp;
8640 const char* target_name;
8642 target_name = target->specific_st->name;
8644 /* Defined for this type directly. */
8645 if (target->specific_st->n.tb)
8647 target->specific = target->specific_st->n.tb;
8648 goto specific_found;
8651 /* Look for an inherited specific binding. */
8654 inherited = gfc_find_typebound_proc (super_type, NULL,
8659 gcc_assert (inherited->n.tb);
8660 target->specific = inherited->n.tb;
8661 goto specific_found;
8665 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
8666 " at %L", target_name, st->name, &where);
8669 /* Once we've found the specific binding, check it is not ambiguous with
8670 other specifics already found or inherited for the same GENERIC. */
8672 gcc_assert (target->specific);
8674 /* This must really be a specific binding! */
8675 if (target->specific->is_generic)
8677 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
8678 " '%s' is GENERIC, too", st->name, &where, target_name);
8682 /* Check those already resolved on this type directly. */
8683 for (g = st->n.tb->u.generic; g; g = g->next)
8684 if (g != target && g->specific
8685 && check_generic_tbp_ambiguity (target, g, st->name, where)
8689 /* Check for ambiguity with inherited specific targets. */
8690 for (overridden_tbp = st->n.tb->overridden; overridden_tbp;
8691 overridden_tbp = overridden_tbp->overridden)
8692 if (overridden_tbp->is_generic)
8694 for (g = overridden_tbp->u.generic; g; g = g->next)
8696 gcc_assert (g->specific);
8697 if (check_generic_tbp_ambiguity (target, g,
8698 st->name, where) == FAILURE)
8704 /* If we attempt to "overwrite" a specific binding, this is an error. */
8705 if (st->n.tb->overridden && !st->n.tb->overridden->is_generic)
8707 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
8708 " the same name", st->name, &where);
8712 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
8713 all must have the same attributes here. */
8714 first_target = st->n.tb->u.generic->specific->u.specific;
8715 gcc_assert (first_target);
8716 st->n.tb->subroutine = first_target->n.sym->attr.subroutine;
8717 st->n.tb->function = first_target->n.sym->attr.function;
8723 /* Resolve the type-bound procedures for a derived type. */
8725 static gfc_symbol* resolve_bindings_derived;
8726 static gfc_try resolve_bindings_result;
8729 resolve_typebound_procedure (gfc_symtree* stree)
8734 gfc_symbol* super_type;
8735 gfc_component* comp;
8739 /* Undefined specific symbol from GENERIC target definition. */
8743 if (stree->n.tb->error)
8746 /* If this is a GENERIC binding, use that routine. */
8747 if (stree->n.tb->is_generic)
8749 if (resolve_typebound_generic (resolve_bindings_derived, stree)
8755 /* Get the target-procedure to check it. */
8756 gcc_assert (!stree->n.tb->is_generic);
8757 gcc_assert (stree->n.tb->u.specific);
8758 proc = stree->n.tb->u.specific->n.sym;
8759 where = stree->n.tb->where;
8761 /* Default access should already be resolved from the parser. */
8762 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
8764 /* It should be a module procedure or an external procedure with explicit
8765 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
8766 if ((!proc->attr.subroutine && !proc->attr.function)
8767 || (proc->attr.proc != PROC_MODULE
8768 && proc->attr.if_source != IFSRC_IFBODY)
8769 || (proc->attr.abstract && !stree->n.tb->deferred))
8771 gfc_error ("'%s' must be a module procedure or an external procedure with"
8772 " an explicit interface at %L", proc->name, &where);
8775 stree->n.tb->subroutine = proc->attr.subroutine;
8776 stree->n.tb->function = proc->attr.function;
8778 /* Find the super-type of the current derived type. We could do this once and
8779 store in a global if speed is needed, but as long as not I believe this is
8780 more readable and clearer. */
8781 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
8783 /* If PASS, resolve and check arguments if not already resolved / loaded
8784 from a .mod file. */
8785 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
8787 if (stree->n.tb->pass_arg)
8789 gfc_formal_arglist* i;
8791 /* If an explicit passing argument name is given, walk the arg-list
8795 stree->n.tb->pass_arg_num = 1;
8796 for (i = proc->formal; i; i = i->next)
8798 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
8803 ++stree->n.tb->pass_arg_num;
8808 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
8810 proc->name, stree->n.tb->pass_arg, &where,
8811 stree->n.tb->pass_arg);
8817 /* Otherwise, take the first one; there should in fact be at least
8819 stree->n.tb->pass_arg_num = 1;
8822 gfc_error ("Procedure '%s' with PASS at %L must have at"
8823 " least one argument", proc->name, &where);
8826 me_arg = proc->formal->sym;
8829 /* Now check that the argument-type matches. */
8830 gcc_assert (me_arg);
8831 if (me_arg->ts.type != BT_DERIVED
8832 || me_arg->ts.derived != resolve_bindings_derived)
8834 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
8835 " the derived-type '%s'", me_arg->name, proc->name,
8836 me_arg->name, &where, resolve_bindings_derived->name);
8840 gfc_warning ("Polymorphic entities are not yet implemented,"
8841 " non-polymorphic passed-object dummy argument of '%s'"
8842 " at %L accepted", proc->name, &where);
8845 /* If we are extending some type, check that we don't override a procedure
8846 flagged NON_OVERRIDABLE. */
8847 stree->n.tb->overridden = NULL;
8850 gfc_symtree* overridden;
8851 overridden = gfc_find_typebound_proc (super_type, NULL,
8854 if (overridden && overridden->n.tb)
8855 stree->n.tb->overridden = overridden->n.tb;
8857 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
8861 /* See if there's a name collision with a component directly in this type. */
8862 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
8863 if (!strcmp (comp->name, stree->name))
8865 gfc_error ("Procedure '%s' at %L has the same name as a component of"
8867 stree->name, &where, resolve_bindings_derived->name);
8871 /* Try to find a name collision with an inherited component. */
8872 if (super_type && gfc_find_component (super_type, stree->name, true, true))
8874 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
8875 " component of '%s'",
8876 stree->name, &where, resolve_bindings_derived->name);
8880 stree->n.tb->error = 0;
8884 resolve_bindings_result = FAILURE;
8885 stree->n.tb->error = 1;
8889 resolve_typebound_procedures (gfc_symbol* derived)
8891 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
8894 resolve_bindings_derived = derived;
8895 resolve_bindings_result = SUCCESS;
8896 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
8897 &resolve_typebound_procedure);
8899 return resolve_bindings_result;
8903 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
8904 to give all identical derived types the same backend_decl. */
8906 add_dt_to_dt_list (gfc_symbol *derived)
8908 gfc_dt_list *dt_list;
8910 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
8911 if (derived == dt_list->derived)
8914 if (dt_list == NULL)
8916 dt_list = gfc_get_dt_list ();
8917 dt_list->next = gfc_derived_types;
8918 dt_list->derived = derived;
8919 gfc_derived_types = dt_list;
8924 /* Ensure that a derived-type is really not abstract, meaning that every
8925 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
8928 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
8933 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
8935 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
8938 if (st->n.tb && st->n.tb->deferred)
8940 gfc_symtree* overriding;
8941 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true);
8942 gcc_assert (overriding && overriding->n.tb);
8943 if (overriding->n.tb->deferred)
8945 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
8946 " '%s' is DEFERRED and not overridden",
8947 sub->name, &sub->declared_at, st->name);
8956 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
8958 /* The algorithm used here is to recursively travel up the ancestry of sub
8959 and for each ancestor-type, check all bindings. If any of them is
8960 DEFERRED, look it up starting from sub and see if the found (overriding)
8961 binding is not DEFERRED.
8962 This is not the most efficient way to do this, but it should be ok and is
8963 clearer than something sophisticated. */
8965 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
8967 /* Walk bindings of this ancestor. */
8968 if (ancestor->f2k_derived)
8971 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
8976 /* Find next ancestor type and recurse on it. */
8977 ancestor = gfc_get_derived_super_type (ancestor);
8979 return ensure_not_abstract (sub, ancestor);
8985 /* Resolve the components of a derived type. */
8988 resolve_fl_derived (gfc_symbol *sym)
8990 gfc_symbol* super_type;
8994 super_type = gfc_get_derived_super_type (sym);
8996 /* Ensure the extended type gets resolved before we do. */
8997 if (super_type && resolve_fl_derived (super_type) == FAILURE)
9000 /* An ABSTRACT type must be extensible. */
9001 if (sym->attr.abstract && (sym->attr.is_bind_c || sym->attr.sequence))
9003 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
9004 sym->name, &sym->declared_at);
9008 for (c = sym->components; c != NULL; c = c->next)
9010 if (c->attr.proc_pointer && c->ts.interface)
9012 if (c->ts.interface->attr.procedure)
9013 gfc_error ("Interface '%s', used by procedure pointer component "
9014 "'%s' at %L, is declared in a later PROCEDURE statement",
9015 c->ts.interface->name, c->name, &c->loc);
9017 /* Get the attributes from the interface (now resolved). */
9018 if (c->ts.interface->attr.if_source
9019 || c->ts.interface->attr.intrinsic)
9021 gfc_symbol *ifc = c->ts.interface;
9023 if (ifc->attr.intrinsic)
9024 resolve_intrinsic (ifc, &ifc->declared_at);
9027 c->ts = ifc->result->ts;
9030 c->ts.interface = ifc;
9031 c->attr.function = ifc->attr.function;
9032 c->attr.subroutine = ifc->attr.subroutine;
9033 /* TODO: gfc_copy_formal_args (c, ifc); */
9035 c->attr.allocatable = ifc->attr.allocatable;
9036 c->attr.pointer = ifc->attr.pointer;
9037 c->attr.pure = ifc->attr.pure;
9038 c->attr.elemental = ifc->attr.elemental;
9039 c->attr.dimension = ifc->attr.dimension;
9040 c->attr.recursive = ifc->attr.recursive;
9041 c->attr.always_explicit = ifc->attr.always_explicit;
9042 /* Copy array spec. */
9043 c->as = gfc_copy_array_spec (ifc->as);
9047 for (i = 0; i < c->as->rank; i++)
9049 gfc_expr_replace_symbols (c->as->lower[i], c);
9050 gfc_expr_replace_symbols (c->as->upper[i], c);
9053 /* Copy char length. */
9056 c->ts.cl = gfc_get_charlen();
9057 c->ts.cl->resolved = ifc->ts.cl->resolved;
9058 c->ts.cl->length = gfc_copy_expr (ifc->ts.cl->length);
9059 /*gfc_expr_replace_symbols (c->ts.cl->length, c);*/
9060 /* Add charlen to namespace. */
9063 c->ts.cl->next = c->formal_ns->cl_list;
9064 c->formal_ns->cl_list = c->ts.cl;
9068 else if (c->ts.interface->name[0] != '\0')
9070 gfc_error ("Interface '%s' of procedure pointer component "
9071 "'%s' at %L must be explicit", c->ts.interface->name,
9076 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
9078 c->ts = *gfc_get_default_type (c->name, NULL);
9079 c->attr.implicit_type = 1;
9082 /* Check type-spec if this is not the parent-type component. */
9083 if ((!sym->attr.extension || c != sym->components)
9084 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
9087 /* If this type is an extension, see if this component has the same name
9088 as an inherited type-bound procedure. */
9090 && gfc_find_typebound_proc (super_type, NULL, c->name, true))
9092 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
9093 " inherited type-bound procedure",
9094 c->name, sym->name, &c->loc);
9098 if (c->ts.type == BT_CHARACTER)
9100 if (c->ts.cl->length == NULL
9101 || (resolve_charlen (c->ts.cl) == FAILURE)
9102 || !gfc_is_constant_expr (c->ts.cl->length))
9104 gfc_error ("Character length of component '%s' needs to "
9105 "be a constant specification expression at %L",
9107 c->ts.cl->length ? &c->ts.cl->length->where : &c->loc);
9112 if (c->ts.type == BT_DERIVED
9113 && sym->component_access != ACCESS_PRIVATE
9114 && gfc_check_access (sym->attr.access, sym->ns->default_access)
9115 && !is_sym_host_assoc (c->ts.derived, sym->ns)
9116 && !c->ts.derived->attr.use_assoc
9117 && !gfc_check_access (c->ts.derived->attr.access,
9118 c->ts.derived->ns->default_access)
9119 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
9120 "is a PRIVATE type and cannot be a component of "
9121 "'%s', which is PUBLIC at %L", c->name,
9122 sym->name, &sym->declared_at) == FAILURE)
9125 if (sym->attr.sequence)
9127 if (c->ts.type == BT_DERIVED && c->ts.derived->attr.sequence == 0)
9129 gfc_error ("Component %s of SEQUENCE type declared at %L does "
9130 "not have the SEQUENCE attribute",
9131 c->ts.derived->name, &sym->declared_at);
9136 if (c->ts.type == BT_DERIVED && c->attr.pointer
9137 && c->ts.derived->components == NULL
9138 && !c->ts.derived->attr.zero_comp)
9140 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
9141 "that has not been declared", c->name, sym->name,
9146 /* Ensure that all the derived type components are put on the
9147 derived type list; even in formal namespaces, where derived type
9148 pointer components might not have been declared. */
9149 if (c->ts.type == BT_DERIVED
9151 && c->ts.derived->components
9153 && sym != c->ts.derived)
9154 add_dt_to_dt_list (c->ts.derived);
9156 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
9160 for (i = 0; i < c->as->rank; i++)
9162 if (c->as->lower[i] == NULL
9163 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
9164 || !gfc_is_constant_expr (c->as->lower[i])
9165 || c->as->upper[i] == NULL
9166 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
9167 || !gfc_is_constant_expr (c->as->upper[i]))
9169 gfc_error ("Component '%s' of '%s' at %L must have "
9170 "constant array bounds",
9171 c->name, sym->name, &c->loc);
9177 /* Resolve the type-bound procedures. */
9178 if (resolve_typebound_procedures (sym) == FAILURE)
9181 /* Resolve the finalizer procedures. */
9182 if (gfc_resolve_finalizers (sym) == FAILURE)
9185 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
9186 all DEFERRED bindings are overridden. */
9187 if (super_type && super_type->attr.abstract && !sym->attr.abstract
9188 && ensure_not_abstract (sym, super_type) == FAILURE)
9191 /* Add derived type to the derived type list. */
9192 add_dt_to_dt_list (sym);
9199 resolve_fl_namelist (gfc_symbol *sym)
9204 /* Reject PRIVATE objects in a PUBLIC namelist. */
9205 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
9207 for (nl = sym->namelist; nl; nl = nl->next)
9209 if (!nl->sym->attr.use_assoc
9210 && !is_sym_host_assoc (nl->sym, sym->ns)
9211 && !gfc_check_access(nl->sym->attr.access,
9212 nl->sym->ns->default_access))
9214 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
9215 "cannot be member of PUBLIC namelist '%s' at %L",
9216 nl->sym->name, sym->name, &sym->declared_at);
9220 /* Types with private components that came here by USE-association. */
9221 if (nl->sym->ts.type == BT_DERIVED
9222 && derived_inaccessible (nl->sym->ts.derived))
9224 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
9225 "components and cannot be member of namelist '%s' at %L",
9226 nl->sym->name, sym->name, &sym->declared_at);
9230 /* Types with private components that are defined in the same module. */
9231 if (nl->sym->ts.type == BT_DERIVED
9232 && !is_sym_host_assoc (nl->sym->ts.derived, sym->ns)
9233 && !gfc_check_access (nl->sym->ts.derived->attr.private_comp
9234 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
9235 nl->sym->ns->default_access))
9237 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
9238 "cannot be a member of PUBLIC namelist '%s' at %L",
9239 nl->sym->name, sym->name, &sym->declared_at);
9245 for (nl = sym->namelist; nl; nl = nl->next)
9247 /* Reject namelist arrays of assumed shape. */
9248 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
9249 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
9250 "must not have assumed shape in namelist "
9251 "'%s' at %L", nl->sym->name, sym->name,
9252 &sym->declared_at) == FAILURE)
9255 /* Reject namelist arrays that are not constant shape. */
9256 if (is_non_constant_shape_array (nl->sym))
9258 gfc_error ("NAMELIST array object '%s' must have constant "
9259 "shape in namelist '%s' at %L", nl->sym->name,
9260 sym->name, &sym->declared_at);
9264 /* Namelist objects cannot have allocatable or pointer components. */
9265 if (nl->sym->ts.type != BT_DERIVED)
9268 if (nl->sym->ts.derived->attr.alloc_comp)
9270 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9271 "have ALLOCATABLE components",
9272 nl->sym->name, sym->name, &sym->declared_at);
9276 if (nl->sym->ts.derived->attr.pointer_comp)
9278 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9279 "have POINTER components",
9280 nl->sym->name, sym->name, &sym->declared_at);
9286 /* 14.1.2 A module or internal procedure represent local entities
9287 of the same type as a namelist member and so are not allowed. */
9288 for (nl = sym->namelist; nl; nl = nl->next)
9290 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
9293 if (nl->sym->attr.function && nl->sym == nl->sym->result)
9294 if ((nl->sym == sym->ns->proc_name)
9296 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
9300 if (nl->sym && nl->sym->name)
9301 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
9302 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
9304 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
9305 "attribute in '%s' at %L", nlsym->name,
9316 resolve_fl_parameter (gfc_symbol *sym)
9318 /* A parameter array's shape needs to be constant. */
9320 && (sym->as->type == AS_DEFERRED
9321 || is_non_constant_shape_array (sym)))
9323 gfc_error ("Parameter array '%s' at %L cannot be automatic "
9324 "or of deferred shape", sym->name, &sym->declared_at);
9328 /* Make sure a parameter that has been implicitly typed still
9329 matches the implicit type, since PARAMETER statements can precede
9330 IMPLICIT statements. */
9331 if (sym->attr.implicit_type
9332 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
9335 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
9336 "later IMPLICIT type", sym->name, &sym->declared_at);
9340 /* Make sure the types of derived parameters are consistent. This
9341 type checking is deferred until resolution because the type may
9342 refer to a derived type from the host. */
9343 if (sym->ts.type == BT_DERIVED
9344 && !gfc_compare_types (&sym->ts, &sym->value->ts))
9346 gfc_error ("Incompatible derived type in PARAMETER at %L",
9347 &sym->value->where);
9354 /* Do anything necessary to resolve a symbol. Right now, we just
9355 assume that an otherwise unknown symbol is a variable. This sort
9356 of thing commonly happens for symbols in module. */
9359 resolve_symbol (gfc_symbol *sym)
9361 int check_constant, mp_flag;
9362 gfc_symtree *symtree;
9363 gfc_symtree *this_symtree;
9367 if (sym->attr.flavor == FL_UNKNOWN)
9370 /* If we find that a flavorless symbol is an interface in one of the
9371 parent namespaces, find its symtree in this namespace, free the
9372 symbol and set the symtree to point to the interface symbol. */
9373 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
9375 symtree = gfc_find_symtree (ns->sym_root, sym->name);
9376 if (symtree && symtree->n.sym->generic)
9378 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
9382 gfc_free_symbol (sym);
9383 symtree->n.sym->refs++;
9384 this_symtree->n.sym = symtree->n.sym;
9389 /* Otherwise give it a flavor according to such attributes as
9391 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
9392 sym->attr.flavor = FL_VARIABLE;
9395 sym->attr.flavor = FL_PROCEDURE;
9396 if (sym->attr.dimension)
9397 sym->attr.function = 1;
9401 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
9402 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
9404 if (sym->attr.procedure && sym->ts.interface
9405 && sym->attr.if_source != IFSRC_DECL)
9407 if (sym->ts.interface->attr.procedure)
9408 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared "
9409 "in a later PROCEDURE statement", sym->ts.interface->name,
9410 sym->name,&sym->declared_at);
9412 /* Get the attributes from the interface (now resolved). */
9413 if (sym->ts.interface->attr.if_source
9414 || sym->ts.interface->attr.intrinsic)
9416 gfc_symbol *ifc = sym->ts.interface;
9418 if (ifc->attr.intrinsic)
9419 resolve_intrinsic (ifc, &ifc->declared_at);
9422 sym->ts = ifc->result->ts;
9425 sym->ts.interface = ifc;
9426 sym->attr.function = ifc->attr.function;
9427 sym->attr.subroutine = ifc->attr.subroutine;
9428 gfc_copy_formal_args (sym, ifc);
9430 sym->attr.allocatable = ifc->attr.allocatable;
9431 sym->attr.pointer = ifc->attr.pointer;
9432 sym->attr.pure = ifc->attr.pure;
9433 sym->attr.elemental = ifc->attr.elemental;
9434 sym->attr.dimension = ifc->attr.dimension;
9435 sym->attr.recursive = ifc->attr.recursive;
9436 sym->attr.always_explicit = ifc->attr.always_explicit;
9437 /* Copy array spec. */
9438 sym->as = gfc_copy_array_spec (ifc->as);
9442 for (i = 0; i < sym->as->rank; i++)
9444 gfc_expr_replace_symbols (sym->as->lower[i], sym);
9445 gfc_expr_replace_symbols (sym->as->upper[i], sym);
9448 /* Copy char length. */
9451 sym->ts.cl = gfc_get_charlen();
9452 sym->ts.cl->resolved = ifc->ts.cl->resolved;
9453 sym->ts.cl->length = gfc_copy_expr (ifc->ts.cl->length);
9454 gfc_expr_replace_symbols (sym->ts.cl->length, sym);
9455 /* Add charlen to namespace. */
9458 sym->ts.cl->next = sym->formal_ns->cl_list;
9459 sym->formal_ns->cl_list = sym->ts.cl;
9463 else if (sym->ts.interface->name[0] != '\0')
9465 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
9466 sym->ts.interface->name, sym->name, &sym->declared_at);
9471 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
9474 /* Symbols that are module procedures with results (functions) have
9475 the types and array specification copied for type checking in
9476 procedures that call them, as well as for saving to a module
9477 file. These symbols can't stand the scrutiny that their results
9479 mp_flag = (sym->result != NULL && sym->result != sym);
9482 /* Make sure that the intrinsic is consistent with its internal
9483 representation. This needs to be done before assigning a default
9484 type to avoid spurious warnings. */
9485 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic)
9487 gfc_intrinsic_sym* isym;
9490 /* We already know this one is an intrinsic, so we don't call
9491 gfc_is_intrinsic for full checking but rather use gfc_find_function and
9492 gfc_find_subroutine directly to check whether it is a function or
9495 if ((isym = gfc_find_function (sym->name)))
9497 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
9498 && !sym->attr.implicit_type)
9499 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
9500 " ignored", sym->name, &sym->declared_at);
9502 else if ((isym = gfc_find_subroutine (sym->name)))
9504 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
9506 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
9507 " specifier", sym->name, &sym->declared_at);
9513 gfc_error ("'%s' declared INTRINSIC at %L does not exist",
9514 sym->name, &sym->declared_at);
9518 /* Check it is actually available in the standard settings. */
9519 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
9522 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
9523 " available in the current standard settings but %s. Use"
9524 " an appropriate -std=* option or enable -fall-intrinsics"
9525 " in order to use it.",
9526 sym->name, &sym->declared_at, symstd);
9531 /* Assign default type to symbols that need one and don't have one. */
9532 if (sym->ts.type == BT_UNKNOWN)
9534 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
9535 gfc_set_default_type (sym, 1, NULL);
9537 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
9539 /* The specific case of an external procedure should emit an error
9540 in the case that there is no implicit type. */
9542 gfc_set_default_type (sym, sym->attr.external, NULL);
9545 /* Result may be in another namespace. */
9546 resolve_symbol (sym->result);
9548 if (!sym->result->attr.proc_pointer)
9550 sym->ts = sym->result->ts;
9551 sym->as = gfc_copy_array_spec (sym->result->as);
9552 sym->attr.dimension = sym->result->attr.dimension;
9553 sym->attr.pointer = sym->result->attr.pointer;
9554 sym->attr.allocatable = sym->result->attr.allocatable;
9560 /* Assumed size arrays and assumed shape arrays must be dummy
9564 && (sym->as->type == AS_ASSUMED_SIZE
9565 || sym->as->type == AS_ASSUMED_SHAPE)
9566 && sym->attr.dummy == 0)
9568 if (sym->as->type == AS_ASSUMED_SIZE)
9569 gfc_error ("Assumed size array at %L must be a dummy argument",
9572 gfc_error ("Assumed shape array at %L must be a dummy argument",
9577 /* Make sure symbols with known intent or optional are really dummy
9578 variable. Because of ENTRY statement, this has to be deferred
9579 until resolution time. */
9581 if (!sym->attr.dummy
9582 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
9584 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
9588 if (sym->attr.value && !sym->attr.dummy)
9590 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
9591 "it is not a dummy argument", sym->name, &sym->declared_at);
9595 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
9597 gfc_charlen *cl = sym->ts.cl;
9598 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9600 gfc_error ("Character dummy variable '%s' at %L with VALUE "
9601 "attribute must have constant length",
9602 sym->name, &sym->declared_at);
9606 if (sym->ts.is_c_interop
9607 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
9609 gfc_error ("C interoperable character dummy variable '%s' at %L "
9610 "with VALUE attribute must have length one",
9611 sym->name, &sym->declared_at);
9616 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
9617 do this for something that was implicitly typed because that is handled
9618 in gfc_set_default_type. Handle dummy arguments and procedure
9619 definitions separately. Also, anything that is use associated is not
9620 handled here but instead is handled in the module it is declared in.
9621 Finally, derived type definitions are allowed to be BIND(C) since that
9622 only implies that they're interoperable, and they are checked fully for
9623 interoperability when a variable is declared of that type. */
9624 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
9625 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
9626 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
9628 gfc_try t = SUCCESS;
9630 /* First, make sure the variable is declared at the
9631 module-level scope (J3/04-007, Section 15.3). */
9632 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
9633 sym->attr.in_common == 0)
9635 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
9636 "is neither a COMMON block nor declared at the "
9637 "module level scope", sym->name, &(sym->declared_at));
9640 else if (sym->common_head != NULL)
9642 t = verify_com_block_vars_c_interop (sym->common_head);
9646 /* If type() declaration, we need to verify that the components
9647 of the given type are all C interoperable, etc. */
9648 if (sym->ts.type == BT_DERIVED &&
9649 sym->ts.derived->attr.is_c_interop != 1)
9651 /* Make sure the user marked the derived type as BIND(C). If
9652 not, call the verify routine. This could print an error
9653 for the derived type more than once if multiple variables
9654 of that type are declared. */
9655 if (sym->ts.derived->attr.is_bind_c != 1)
9656 verify_bind_c_derived_type (sym->ts.derived);
9660 /* Verify the variable itself as C interoperable if it
9661 is BIND(C). It is not possible for this to succeed if
9662 the verify_bind_c_derived_type failed, so don't have to handle
9663 any error returned by verify_bind_c_derived_type. */
9664 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9670 /* clear the is_bind_c flag to prevent reporting errors more than
9671 once if something failed. */
9672 sym->attr.is_bind_c = 0;
9677 /* If a derived type symbol has reached this point, without its
9678 type being declared, we have an error. Notice that most
9679 conditions that produce undefined derived types have already
9680 been dealt with. However, the likes of:
9681 implicit type(t) (t) ..... call foo (t) will get us here if
9682 the type is not declared in the scope of the implicit
9683 statement. Change the type to BT_UNKNOWN, both because it is so
9684 and to prevent an ICE. */
9685 if (sym->ts.type == BT_DERIVED && sym->ts.derived->components == NULL
9686 && !sym->ts.derived->attr.zero_comp)
9688 gfc_error ("The derived type '%s' at %L is of type '%s', "
9689 "which has not been defined", sym->name,
9690 &sym->declared_at, sym->ts.derived->name);
9691 sym->ts.type = BT_UNKNOWN;
9695 /* Make sure that the derived type has been resolved and that the
9696 derived type is visible in the symbol's namespace, if it is a
9697 module function and is not PRIVATE. */
9698 if (sym->ts.type == BT_DERIVED
9699 && sym->ts.derived->attr.use_assoc
9700 && sym->ns->proc_name
9701 && sym->ns->proc_name->attr.flavor == FL_MODULE)
9705 if (resolve_fl_derived (sym->ts.derived) == FAILURE)
9708 gfc_find_symbol (sym->ts.derived->name, sym->ns, 1, &ds);
9709 if (!ds && sym->attr.function
9710 && gfc_check_access (sym->attr.access, sym->ns->default_access))
9712 symtree = gfc_new_symtree (&sym->ns->sym_root,
9713 sym->ts.derived->name);
9714 symtree->n.sym = sym->ts.derived;
9715 sym->ts.derived->refs++;
9719 /* Unless the derived-type declaration is use associated, Fortran 95
9720 does not allow public entries of private derived types.
9721 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
9723 if (sym->ts.type == BT_DERIVED
9724 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
9725 && !sym->ts.derived->attr.use_assoc
9726 && gfc_check_access (sym->attr.access, sym->ns->default_access)
9727 && !gfc_check_access (sym->ts.derived->attr.access,
9728 sym->ts.derived->ns->default_access)
9729 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
9730 "of PRIVATE derived type '%s'",
9731 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
9732 : "variable", sym->name, &sym->declared_at,
9733 sym->ts.derived->name) == FAILURE)
9736 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
9737 default initialization is defined (5.1.2.4.4). */
9738 if (sym->ts.type == BT_DERIVED
9740 && sym->attr.intent == INTENT_OUT
9742 && sym->as->type == AS_ASSUMED_SIZE)
9744 for (c = sym->ts.derived->components; c; c = c->next)
9748 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
9749 "ASSUMED SIZE and so cannot have a default initializer",
9750 sym->name, &sym->declared_at);
9756 switch (sym->attr.flavor)
9759 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
9764 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
9769 if (resolve_fl_namelist (sym) == FAILURE)
9774 if (resolve_fl_parameter (sym) == FAILURE)
9782 /* Resolve array specifier. Check as well some constraints
9783 on COMMON blocks. */
9785 check_constant = sym->attr.in_common && !sym->attr.pointer;
9787 /* Set the formal_arg_flag so that check_conflict will not throw
9788 an error for host associated variables in the specification
9789 expression for an array_valued function. */
9790 if (sym->attr.function && sym->as)
9791 formal_arg_flag = 1;
9793 gfc_resolve_array_spec (sym->as, check_constant);
9795 formal_arg_flag = 0;
9797 /* Resolve formal namespaces. */
9798 if (sym->formal_ns && sym->formal_ns != gfc_current_ns)
9799 gfc_resolve (sym->formal_ns);
9801 /* Check threadprivate restrictions. */
9802 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
9803 && (!sym->attr.in_common
9804 && sym->module == NULL
9805 && (sym->ns->proc_name == NULL
9806 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
9807 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
9809 /* If we have come this far we can apply default-initializers, as
9810 described in 14.7.5, to those variables that have not already
9811 been assigned one. */
9812 if (sym->ts.type == BT_DERIVED
9813 && sym->attr.referenced
9814 && sym->ns == gfc_current_ns
9816 && !sym->attr.allocatable
9817 && !sym->attr.alloc_comp)
9819 symbol_attribute *a = &sym->attr;
9821 if ((!a->save && !a->dummy && !a->pointer
9822 && !a->in_common && !a->use_assoc
9823 && !(a->function && sym != sym->result))
9824 || (a->dummy && a->intent == INTENT_OUT))
9825 apply_default_init (sym);
9828 /* If this symbol has a type-spec, check it. */
9829 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
9830 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
9831 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
9837 /************* Resolve DATA statements *************/
9841 gfc_data_value *vnode;
9847 /* Advance the values structure to point to the next value in the data list. */
9850 next_data_value (void)
9853 while (mpz_cmp_ui (values.left, 0) == 0)
9855 if (values.vnode->next == NULL)
9858 values.vnode = values.vnode->next;
9859 mpz_set (values.left, values.vnode->repeat);
9867 check_data_variable (gfc_data_variable *var, locus *where)
9873 ar_type mark = AR_UNKNOWN;
9875 mpz_t section_index[GFC_MAX_DIMENSIONS];
9881 if (gfc_resolve_expr (var->expr) == FAILURE)
9885 mpz_init_set_si (offset, 0);
9888 if (e->expr_type != EXPR_VARIABLE)
9889 gfc_internal_error ("check_data_variable(): Bad expression");
9891 sym = e->symtree->n.sym;
9893 if (sym->ns->is_block_data && !sym->attr.in_common)
9895 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
9896 sym->name, &sym->declared_at);
9899 if (e->ref == NULL && sym->as)
9901 gfc_error ("DATA array '%s' at %L must be specified in a previous"
9902 " declaration", sym->name, where);
9906 has_pointer = sym->attr.pointer;
9908 for (ref = e->ref; ref; ref = ref->next)
9910 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
9914 && ref->type == REF_ARRAY
9915 && ref->u.ar.type != AR_FULL)
9917 gfc_error ("DATA element '%s' at %L is a pointer and so must "
9918 "be a full array", sym->name, where);
9923 if (e->rank == 0 || has_pointer)
9925 mpz_init_set_ui (size, 1);
9932 /* Find the array section reference. */
9933 for (ref = e->ref; ref; ref = ref->next)
9935 if (ref->type != REF_ARRAY)
9937 if (ref->u.ar.type == AR_ELEMENT)
9943 /* Set marks according to the reference pattern. */
9944 switch (ref->u.ar.type)
9952 /* Get the start position of array section. */
9953 gfc_get_section_index (ar, section_index, &offset);
9961 if (gfc_array_size (e, &size) == FAILURE)
9963 gfc_error ("Nonconstant array section at %L in DATA statement",
9972 while (mpz_cmp_ui (size, 0) > 0)
9974 if (next_data_value () == FAILURE)
9976 gfc_error ("DATA statement at %L has more variables than values",
9982 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
9986 /* If we have more than one element left in the repeat count,
9987 and we have more than one element left in the target variable,
9988 then create a range assignment. */
9989 /* FIXME: Only done for full arrays for now, since array sections
9991 if (mark == AR_FULL && ref && ref->next == NULL
9992 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
9996 if (mpz_cmp (size, values.left) >= 0)
9998 mpz_init_set (range, values.left);
9999 mpz_sub (size, size, values.left);
10000 mpz_set_ui (values.left, 0);
10004 mpz_init_set (range, size);
10005 mpz_sub (values.left, values.left, size);
10006 mpz_set_ui (size, 0);
10009 gfc_assign_data_value_range (var->expr, values.vnode->expr,
10012 mpz_add (offset, offset, range);
10016 /* Assign initial value to symbol. */
10019 mpz_sub_ui (values.left, values.left, 1);
10020 mpz_sub_ui (size, size, 1);
10022 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
10026 if (mark == AR_FULL)
10027 mpz_add_ui (offset, offset, 1);
10029 /* Modify the array section indexes and recalculate the offset
10030 for next element. */
10031 else if (mark == AR_SECTION)
10032 gfc_advance_section (section_index, ar, &offset);
10036 if (mark == AR_SECTION)
10038 for (i = 0; i < ar->dimen; i++)
10039 mpz_clear (section_index[i]);
10043 mpz_clear (offset);
10049 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
10051 /* Iterate over a list of elements in a DATA statement. */
10054 traverse_data_list (gfc_data_variable *var, locus *where)
10057 iterator_stack frame;
10058 gfc_expr *e, *start, *end, *step;
10059 gfc_try retval = SUCCESS;
10061 mpz_init (frame.value);
10063 start = gfc_copy_expr (var->iter.start);
10064 end = gfc_copy_expr (var->iter.end);
10065 step = gfc_copy_expr (var->iter.step);
10067 if (gfc_simplify_expr (start, 1) == FAILURE
10068 || start->expr_type != EXPR_CONSTANT)
10070 gfc_error ("iterator start at %L does not simplify", &start->where);
10074 if (gfc_simplify_expr (end, 1) == FAILURE
10075 || end->expr_type != EXPR_CONSTANT)
10077 gfc_error ("iterator end at %L does not simplify", &end->where);
10081 if (gfc_simplify_expr (step, 1) == FAILURE
10082 || step->expr_type != EXPR_CONSTANT)
10084 gfc_error ("iterator step at %L does not simplify", &step->where);
10089 mpz_init_set (trip, end->value.integer);
10090 mpz_sub (trip, trip, start->value.integer);
10091 mpz_add (trip, trip, step->value.integer);
10093 mpz_div (trip, trip, step->value.integer);
10095 mpz_set (frame.value, start->value.integer);
10097 frame.prev = iter_stack;
10098 frame.variable = var->iter.var->symtree;
10099 iter_stack = &frame;
10101 while (mpz_cmp_ui (trip, 0) > 0)
10103 if (traverse_data_var (var->list, where) == FAILURE)
10110 e = gfc_copy_expr (var->expr);
10111 if (gfc_simplify_expr (e, 1) == FAILURE)
10119 mpz_add (frame.value, frame.value, step->value.integer);
10121 mpz_sub_ui (trip, trip, 1);
10126 mpz_clear (frame.value);
10128 gfc_free_expr (start);
10129 gfc_free_expr (end);
10130 gfc_free_expr (step);
10132 iter_stack = frame.prev;
10137 /* Type resolve variables in the variable list of a DATA statement. */
10140 traverse_data_var (gfc_data_variable *var, locus *where)
10144 for (; var; var = var->next)
10146 if (var->expr == NULL)
10147 t = traverse_data_list (var, where);
10149 t = check_data_variable (var, where);
10159 /* Resolve the expressions and iterators associated with a data statement.
10160 This is separate from the assignment checking because data lists should
10161 only be resolved once. */
10164 resolve_data_variables (gfc_data_variable *d)
10166 for (; d; d = d->next)
10168 if (d->list == NULL)
10170 if (gfc_resolve_expr (d->expr) == FAILURE)
10175 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
10178 if (resolve_data_variables (d->list) == FAILURE)
10187 /* Resolve a single DATA statement. We implement this by storing a pointer to
10188 the value list into static variables, and then recursively traversing the
10189 variables list, expanding iterators and such. */
10192 resolve_data (gfc_data *d)
10195 if (resolve_data_variables (d->var) == FAILURE)
10198 values.vnode = d->value;
10199 if (d->value == NULL)
10200 mpz_set_ui (values.left, 0);
10202 mpz_set (values.left, d->value->repeat);
10204 if (traverse_data_var (d->var, &d->where) == FAILURE)
10207 /* At this point, we better not have any values left. */
10209 if (next_data_value () == SUCCESS)
10210 gfc_error ("DATA statement at %L has more values than variables",
10215 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
10216 accessed by host or use association, is a dummy argument to a pure function,
10217 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
10218 is storage associated with any such variable, shall not be used in the
10219 following contexts: (clients of this function). */
10221 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
10222 procedure. Returns zero if assignment is OK, nonzero if there is a
10225 gfc_impure_variable (gfc_symbol *sym)
10229 if (sym->attr.use_assoc || sym->attr.in_common)
10232 if (sym->ns != gfc_current_ns)
10233 return !sym->attr.function;
10235 proc = sym->ns->proc_name;
10236 if (sym->attr.dummy && gfc_pure (proc)
10237 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
10239 proc->attr.function))
10242 /* TODO: Sort out what can be storage associated, if anything, and include
10243 it here. In principle equivalences should be scanned but it does not
10244 seem to be possible to storage associate an impure variable this way. */
10249 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
10250 symbol of the current procedure. */
10253 gfc_pure (gfc_symbol *sym)
10255 symbol_attribute attr;
10258 sym = gfc_current_ns->proc_name;
10264 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
10268 /* Test whether the current procedure is elemental or not. */
10271 gfc_elemental (gfc_symbol *sym)
10273 symbol_attribute attr;
10276 sym = gfc_current_ns->proc_name;
10281 return attr.flavor == FL_PROCEDURE && attr.elemental;
10285 /* Warn about unused labels. */
10288 warn_unused_fortran_label (gfc_st_label *label)
10293 warn_unused_fortran_label (label->left);
10295 if (label->defined == ST_LABEL_UNKNOWN)
10298 switch (label->referenced)
10300 case ST_LABEL_UNKNOWN:
10301 gfc_warning ("Label %d at %L defined but not used", label->value,
10305 case ST_LABEL_BAD_TARGET:
10306 gfc_warning ("Label %d at %L defined but cannot be used",
10307 label->value, &label->where);
10314 warn_unused_fortran_label (label->right);
10318 /* Returns the sequence type of a symbol or sequence. */
10321 sequence_type (gfc_typespec ts)
10330 if (ts.derived->components == NULL)
10331 return SEQ_NONDEFAULT;
10333 result = sequence_type (ts.derived->components->ts);
10334 for (c = ts.derived->components->next; c; c = c->next)
10335 if (sequence_type (c->ts) != result)
10341 if (ts.kind != gfc_default_character_kind)
10342 return SEQ_NONDEFAULT;
10344 return SEQ_CHARACTER;
10347 if (ts.kind != gfc_default_integer_kind)
10348 return SEQ_NONDEFAULT;
10350 return SEQ_NUMERIC;
10353 if (!(ts.kind == gfc_default_real_kind
10354 || ts.kind == gfc_default_double_kind))
10355 return SEQ_NONDEFAULT;
10357 return SEQ_NUMERIC;
10360 if (ts.kind != gfc_default_complex_kind)
10361 return SEQ_NONDEFAULT;
10363 return SEQ_NUMERIC;
10366 if (ts.kind != gfc_default_logical_kind)
10367 return SEQ_NONDEFAULT;
10369 return SEQ_NUMERIC;
10372 return SEQ_NONDEFAULT;
10377 /* Resolve derived type EQUIVALENCE object. */
10380 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
10383 gfc_component *c = derived->components;
10388 /* Shall not be an object of nonsequence derived type. */
10389 if (!derived->attr.sequence)
10391 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
10392 "attribute to be an EQUIVALENCE object", sym->name,
10397 /* Shall not have allocatable components. */
10398 if (derived->attr.alloc_comp)
10400 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
10401 "components to be an EQUIVALENCE object",sym->name,
10406 if (sym->attr.in_common && has_default_initializer (sym->ts.derived))
10408 gfc_error ("Derived type variable '%s' at %L with default "
10409 "initialization cannot be in EQUIVALENCE with a variable "
10410 "in COMMON", sym->name, &e->where);
10414 for (; c ; c = c->next)
10418 && (resolve_equivalence_derived (c->ts.derived, sym, e) == FAILURE))
10421 /* Shall not be an object of sequence derived type containing a pointer
10422 in the structure. */
10423 if (c->attr.pointer)
10425 gfc_error ("Derived type variable '%s' at %L with pointer "
10426 "component(s) cannot be an EQUIVALENCE object",
10427 sym->name, &e->where);
10435 /* Resolve equivalence object.
10436 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
10437 an allocatable array, an object of nonsequence derived type, an object of
10438 sequence derived type containing a pointer at any level of component
10439 selection, an automatic object, a function name, an entry name, a result
10440 name, a named constant, a structure component, or a subobject of any of
10441 the preceding objects. A substring shall not have length zero. A
10442 derived type shall not have components with default initialization nor
10443 shall two objects of an equivalence group be initialized.
10444 Either all or none of the objects shall have an protected attribute.
10445 The simple constraints are done in symbol.c(check_conflict) and the rest
10446 are implemented here. */
10449 resolve_equivalence (gfc_equiv *eq)
10452 gfc_symbol *derived;
10453 gfc_symbol *first_sym;
10456 locus *last_where = NULL;
10457 seq_type eq_type, last_eq_type;
10458 gfc_typespec *last_ts;
10459 int object, cnt_protected;
10460 const char *value_name;
10464 last_ts = &eq->expr->symtree->n.sym->ts;
10466 first_sym = eq->expr->symtree->n.sym;
10470 for (object = 1; eq; eq = eq->eq, object++)
10474 e->ts = e->symtree->n.sym->ts;
10475 /* match_varspec might not know yet if it is seeing
10476 array reference or substring reference, as it doesn't
10478 if (e->ref && e->ref->type == REF_ARRAY)
10480 gfc_ref *ref = e->ref;
10481 sym = e->symtree->n.sym;
10483 if (sym->attr.dimension)
10485 ref->u.ar.as = sym->as;
10489 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
10490 if (e->ts.type == BT_CHARACTER
10492 && ref->type == REF_ARRAY
10493 && ref->u.ar.dimen == 1
10494 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
10495 && ref->u.ar.stride[0] == NULL)
10497 gfc_expr *start = ref->u.ar.start[0];
10498 gfc_expr *end = ref->u.ar.end[0];
10501 /* Optimize away the (:) reference. */
10502 if (start == NULL && end == NULL)
10505 e->ref = ref->next;
10507 e->ref->next = ref->next;
10512 ref->type = REF_SUBSTRING;
10514 start = gfc_int_expr (1);
10515 ref->u.ss.start = start;
10516 if (end == NULL && e->ts.cl)
10517 end = gfc_copy_expr (e->ts.cl->length);
10518 ref->u.ss.end = end;
10519 ref->u.ss.length = e->ts.cl;
10526 /* Any further ref is an error. */
10529 gcc_assert (ref->type == REF_ARRAY);
10530 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
10536 if (gfc_resolve_expr (e) == FAILURE)
10539 sym = e->symtree->n.sym;
10541 if (sym->attr.is_protected)
10543 if (cnt_protected > 0 && cnt_protected != object)
10545 gfc_error ("Either all or none of the objects in the "
10546 "EQUIVALENCE set at %L shall have the "
10547 "PROTECTED attribute",
10552 /* Shall not equivalence common block variables in a PURE procedure. */
10553 if (sym->ns->proc_name
10554 && sym->ns->proc_name->attr.pure
10555 && sym->attr.in_common)
10557 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
10558 "object in the pure procedure '%s'",
10559 sym->name, &e->where, sym->ns->proc_name->name);
10563 /* Shall not be a named constant. */
10564 if (e->expr_type == EXPR_CONSTANT)
10566 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
10567 "object", sym->name, &e->where);
10571 derived = e->ts.derived;
10572 if (derived && resolve_equivalence_derived (derived, sym, e) == FAILURE)
10575 /* Check that the types correspond correctly:
10577 A numeric sequence structure may be equivalenced to another sequence
10578 structure, an object of default integer type, default real type, double
10579 precision real type, default logical type such that components of the
10580 structure ultimately only become associated to objects of the same
10581 kind. A character sequence structure may be equivalenced to an object
10582 of default character kind or another character sequence structure.
10583 Other objects may be equivalenced only to objects of the same type and
10584 kind parameters. */
10586 /* Identical types are unconditionally OK. */
10587 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
10588 goto identical_types;
10590 last_eq_type = sequence_type (*last_ts);
10591 eq_type = sequence_type (sym->ts);
10593 /* Since the pair of objects is not of the same type, mixed or
10594 non-default sequences can be rejected. */
10596 msg = "Sequence %s with mixed components in EQUIVALENCE "
10597 "statement at %L with different type objects";
10599 && last_eq_type == SEQ_MIXED
10600 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
10602 || (eq_type == SEQ_MIXED
10603 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10604 &e->where) == FAILURE))
10607 msg = "Non-default type object or sequence %s in EQUIVALENCE "
10608 "statement at %L with objects of different type";
10610 && last_eq_type == SEQ_NONDEFAULT
10611 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
10612 last_where) == FAILURE)
10613 || (eq_type == SEQ_NONDEFAULT
10614 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10615 &e->where) == FAILURE))
10618 msg ="Non-CHARACTER object '%s' in default CHARACTER "
10619 "EQUIVALENCE statement at %L";
10620 if (last_eq_type == SEQ_CHARACTER
10621 && eq_type != SEQ_CHARACTER
10622 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10623 &e->where) == FAILURE)
10626 msg ="Non-NUMERIC object '%s' in default NUMERIC "
10627 "EQUIVALENCE statement at %L";
10628 if (last_eq_type == SEQ_NUMERIC
10629 && eq_type != SEQ_NUMERIC
10630 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10631 &e->where) == FAILURE)
10636 last_where = &e->where;
10641 /* Shall not be an automatic array. */
10642 if (e->ref->type == REF_ARRAY
10643 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
10645 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
10646 "an EQUIVALENCE object", sym->name, &e->where);
10653 /* Shall not be a structure component. */
10654 if (r->type == REF_COMPONENT)
10656 gfc_error ("Structure component '%s' at %L cannot be an "
10657 "EQUIVALENCE object",
10658 r->u.c.component->name, &e->where);
10662 /* A substring shall not have length zero. */
10663 if (r->type == REF_SUBSTRING)
10665 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
10667 gfc_error ("Substring at %L has length zero",
10668 &r->u.ss.start->where);
10678 /* Resolve function and ENTRY types, issue diagnostics if needed. */
10681 resolve_fntype (gfc_namespace *ns)
10683 gfc_entry_list *el;
10686 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
10689 /* If there are any entries, ns->proc_name is the entry master
10690 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
10692 sym = ns->entries->sym;
10694 sym = ns->proc_name;
10695 if (sym->result == sym
10696 && sym->ts.type == BT_UNKNOWN
10697 && gfc_set_default_type (sym, 0, NULL) == FAILURE
10698 && !sym->attr.untyped)
10700 gfc_error ("Function '%s' at %L has no IMPLICIT type",
10701 sym->name, &sym->declared_at);
10702 sym->attr.untyped = 1;
10705 if (sym->ts.type == BT_DERIVED && !sym->ts.derived->attr.use_assoc
10706 && !sym->attr.contained
10707 && !gfc_check_access (sym->ts.derived->attr.access,
10708 sym->ts.derived->ns->default_access)
10709 && gfc_check_access (sym->attr.access, sym->ns->default_access))
10711 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
10712 "%L of PRIVATE type '%s'", sym->name,
10713 &sym->declared_at, sym->ts.derived->name);
10717 for (el = ns->entries->next; el; el = el->next)
10719 if (el->sym->result == el->sym
10720 && el->sym->ts.type == BT_UNKNOWN
10721 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
10722 && !el->sym->attr.untyped)
10724 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
10725 el->sym->name, &el->sym->declared_at);
10726 el->sym->attr.untyped = 1;
10731 /* 12.3.2.1.1 Defined operators. */
10734 gfc_resolve_uops (gfc_symtree *symtree)
10736 gfc_interface *itr;
10738 gfc_formal_arglist *formal;
10740 if (symtree == NULL)
10743 gfc_resolve_uops (symtree->left);
10744 gfc_resolve_uops (symtree->right);
10746 for (itr = symtree->n.uop->op; itr; itr = itr->next)
10749 if (!sym->attr.function)
10750 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
10751 sym->name, &sym->declared_at);
10753 if (sym->ts.type == BT_CHARACTER
10754 && !(sym->ts.cl && sym->ts.cl->length)
10755 && !(sym->result && sym->result->ts.cl
10756 && sym->result->ts.cl->length))
10757 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
10758 "character length", sym->name, &sym->declared_at);
10760 formal = sym->formal;
10761 if (!formal || !formal->sym)
10763 gfc_error ("User operator procedure '%s' at %L must have at least "
10764 "one argument", sym->name, &sym->declared_at);
10768 if (formal->sym->attr.intent != INTENT_IN)
10769 gfc_error ("First argument of operator interface at %L must be "
10770 "INTENT(IN)", &sym->declared_at);
10772 if (formal->sym->attr.optional)
10773 gfc_error ("First argument of operator interface at %L cannot be "
10774 "optional", &sym->declared_at);
10776 formal = formal->next;
10777 if (!formal || !formal->sym)
10780 if (formal->sym->attr.intent != INTENT_IN)
10781 gfc_error ("Second argument of operator interface at %L must be "
10782 "INTENT(IN)", &sym->declared_at);
10784 if (formal->sym->attr.optional)
10785 gfc_error ("Second argument of operator interface at %L cannot be "
10786 "optional", &sym->declared_at);
10789 gfc_error ("Operator interface at %L must have, at most, two "
10790 "arguments", &sym->declared_at);
10795 /* Examine all of the expressions associated with a program unit,
10796 assign types to all intermediate expressions, make sure that all
10797 assignments are to compatible types and figure out which names
10798 refer to which functions or subroutines. It doesn't check code
10799 block, which is handled by resolve_code. */
10802 resolve_types (gfc_namespace *ns)
10808 gfc_namespace* old_ns = gfc_current_ns;
10810 /* Check that all IMPLICIT types are ok. */
10811 if (!ns->seen_implicit_none)
10814 for (letter = 0; letter != GFC_LETTERS; ++letter)
10815 if (ns->set_flag[letter]
10816 && resolve_typespec_used (&ns->default_type[letter],
10817 &ns->implicit_loc[letter],
10822 gfc_current_ns = ns;
10824 resolve_entries (ns);
10826 resolve_common_vars (ns->blank_common.head, false);
10827 resolve_common_blocks (ns->common_root);
10829 resolve_contained_functions (ns);
10831 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
10833 for (cl = ns->cl_list; cl; cl = cl->next)
10834 resolve_charlen (cl);
10836 gfc_traverse_ns (ns, resolve_symbol);
10838 resolve_fntype (ns);
10840 for (n = ns->contained; n; n = n->sibling)
10842 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
10843 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
10844 "also be PURE", n->proc_name->name,
10845 &n->proc_name->declared_at);
10851 gfc_check_interfaces (ns);
10853 gfc_traverse_ns (ns, resolve_values);
10859 for (d = ns->data; d; d = d->next)
10863 gfc_traverse_ns (ns, gfc_formalize_init_value);
10865 gfc_traverse_ns (ns, gfc_verify_binding_labels);
10867 if (ns->common_root != NULL)
10868 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
10870 for (eq = ns->equiv; eq; eq = eq->next)
10871 resolve_equivalence (eq);
10873 /* Warn about unused labels. */
10874 if (warn_unused_label)
10875 warn_unused_fortran_label (ns->st_labels);
10877 gfc_resolve_uops (ns->uop_root);
10879 gfc_current_ns = old_ns;
10883 /* Call resolve_code recursively. */
10886 resolve_codes (gfc_namespace *ns)
10889 bitmap_obstack old_obstack;
10891 for (n = ns->contained; n; n = n->sibling)
10894 gfc_current_ns = ns;
10896 /* Set to an out of range value. */
10897 current_entry_id = -1;
10899 old_obstack = labels_obstack;
10900 bitmap_obstack_initialize (&labels_obstack);
10902 resolve_code (ns->code, ns);
10904 bitmap_obstack_release (&labels_obstack);
10905 labels_obstack = old_obstack;
10909 /* This function is called after a complete program unit has been compiled.
10910 Its purpose is to examine all of the expressions associated with a program
10911 unit, assign types to all intermediate expressions, make sure that all
10912 assignments are to compatible types and figure out which names refer to
10913 which functions or subroutines. */
10916 gfc_resolve (gfc_namespace *ns)
10918 gfc_namespace *old_ns;
10923 old_ns = gfc_current_ns;
10925 resolve_types (ns);
10926 resolve_codes (ns);
10928 gfc_current_ns = old_ns;