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 && sym->result->ts.interface == NULL)
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 (gfc_is_proc_ptr_comp (e, &comp))
1242 if (e->value.compcall.actual == NULL)
1243 e->expr_type = EXPR_VARIABLE;
1246 if (comp->as != NULL)
1247 e->rank = comp->as->rank;
1248 e->expr_type = EXPR_FUNCTION;
1253 if (e->expr_type == EXPR_VARIABLE
1254 && e->symtree->n.sym->attr.generic
1256 && count_specific_procs (e) != 1)
1259 if (e->ts.type != BT_PROCEDURE)
1261 save_need_full_assumed_size = need_full_assumed_size;
1262 if (e->expr_type != EXPR_VARIABLE)
1263 need_full_assumed_size = 0;
1264 if (gfc_resolve_expr (e) != SUCCESS)
1266 need_full_assumed_size = save_need_full_assumed_size;
1270 /* See if the expression node should really be a variable reference. */
1272 sym = e->symtree->n.sym;
1274 if (sym->attr.flavor == FL_PROCEDURE
1275 || sym->attr.intrinsic
1276 || sym->attr.external)
1280 /* If a procedure is not already determined to be something else
1281 check if it is intrinsic. */
1282 if (!sym->attr.intrinsic
1283 && !(sym->attr.external || sym->attr.use_assoc
1284 || sym->attr.if_source == IFSRC_IFBODY)
1285 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1286 sym->attr.intrinsic = 1;
1288 if (sym->attr.proc == PROC_ST_FUNCTION)
1290 gfc_error ("Statement function '%s' at %L is not allowed as an "
1291 "actual argument", sym->name, &e->where);
1294 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1295 sym->attr.subroutine);
1296 if (sym->attr.intrinsic && actual_ok == 0)
1298 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1299 "actual argument", sym->name, &e->where);
1302 if (sym->attr.contained && !sym->attr.use_assoc
1303 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1305 gfc_error ("Internal procedure '%s' is not allowed as an "
1306 "actual argument at %L", sym->name, &e->where);
1309 if (sym->attr.elemental && !sym->attr.intrinsic)
1311 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1312 "allowed as an actual argument at %L", sym->name,
1316 /* Check if a generic interface has a specific procedure
1317 with the same name before emitting an error. */
1318 if (sym->attr.generic && count_specific_procs (e) != 1)
1321 /* Just in case a specific was found for the expression. */
1322 sym = e->symtree->n.sym;
1324 /* If the symbol is the function that names the current (or
1325 parent) scope, then we really have a variable reference. */
1327 if (sym->attr.function && sym->result == sym
1328 && (sym->ns->proc_name == sym
1329 || (sym->ns->parent != NULL
1330 && sym->ns->parent->proc_name == sym)))
1333 /* If all else fails, see if we have a specific intrinsic. */
1334 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1336 gfc_intrinsic_sym *isym;
1338 isym = gfc_find_function (sym->name);
1339 if (isym == NULL || !isym->specific)
1341 gfc_error ("Unable to find a specific INTRINSIC procedure "
1342 "for the reference '%s' at %L", sym->name,
1347 sym->attr.intrinsic = 1;
1348 sym->attr.function = 1;
1351 if (gfc_resolve_expr (e) == FAILURE)
1356 /* See if the name is a module procedure in a parent unit. */
1358 if (was_declared (sym) || sym->ns->parent == NULL)
1361 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1363 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1367 if (parent_st == NULL)
1370 sym = parent_st->n.sym;
1371 e->symtree = parent_st; /* Point to the right thing. */
1373 if (sym->attr.flavor == FL_PROCEDURE
1374 || sym->attr.intrinsic
1375 || sym->attr.external)
1377 if (gfc_resolve_expr (e) == FAILURE)
1383 e->expr_type = EXPR_VARIABLE;
1385 if (sym->as != NULL)
1387 e->rank = sym->as->rank;
1388 e->ref = gfc_get_ref ();
1389 e->ref->type = REF_ARRAY;
1390 e->ref->u.ar.type = AR_FULL;
1391 e->ref->u.ar.as = sym->as;
1394 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1395 primary.c (match_actual_arg). If above code determines that it
1396 is a variable instead, it needs to be resolved as it was not
1397 done at the beginning of this function. */
1398 save_need_full_assumed_size = need_full_assumed_size;
1399 if (e->expr_type != EXPR_VARIABLE)
1400 need_full_assumed_size = 0;
1401 if (gfc_resolve_expr (e) != SUCCESS)
1403 need_full_assumed_size = save_need_full_assumed_size;
1406 /* Check argument list functions %VAL, %LOC and %REF. There is
1407 nothing to do for %REF. */
1408 if (arg->name && arg->name[0] == '%')
1410 if (strncmp ("%VAL", arg->name, 4) == 0)
1412 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1414 gfc_error ("By-value argument at %L is not of numeric "
1421 gfc_error ("By-value argument at %L cannot be an array or "
1422 "an array section", &e->where);
1426 /* Intrinsics are still PROC_UNKNOWN here. However,
1427 since same file external procedures are not resolvable
1428 in gfortran, it is a good deal easier to leave them to
1430 if (ptype != PROC_UNKNOWN
1431 && ptype != PROC_DUMMY
1432 && ptype != PROC_EXTERNAL
1433 && ptype != PROC_MODULE)
1435 gfc_error ("By-value argument at %L is not allowed "
1436 "in this context", &e->where);
1441 /* Statement functions have already been excluded above. */
1442 else if (strncmp ("%LOC", arg->name, 4) == 0
1443 && e->ts.type == BT_PROCEDURE)
1445 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1447 gfc_error ("Passing internal procedure at %L by location "
1448 "not allowed", &e->where);
1459 /* Do the checks of the actual argument list that are specific to elemental
1460 procedures. If called with c == NULL, we have a function, otherwise if
1461 expr == NULL, we have a subroutine. */
1464 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1466 gfc_actual_arglist *arg0;
1467 gfc_actual_arglist *arg;
1468 gfc_symbol *esym = NULL;
1469 gfc_intrinsic_sym *isym = NULL;
1471 gfc_intrinsic_arg *iformal = NULL;
1472 gfc_formal_arglist *eformal = NULL;
1473 bool formal_optional = false;
1474 bool set_by_optional = false;
1478 /* Is this an elemental procedure? */
1479 if (expr && expr->value.function.actual != NULL)
1481 if (expr->value.function.esym != NULL
1482 && expr->value.function.esym->attr.elemental)
1484 arg0 = expr->value.function.actual;
1485 esym = expr->value.function.esym;
1487 else if (expr->value.function.isym != NULL
1488 && expr->value.function.isym->elemental)
1490 arg0 = expr->value.function.actual;
1491 isym = expr->value.function.isym;
1496 else if (c && c->ext.actual != NULL)
1498 arg0 = c->ext.actual;
1500 if (c->resolved_sym)
1501 esym = c->resolved_sym;
1503 esym = c->symtree->n.sym;
1506 if (!esym->attr.elemental)
1512 /* The rank of an elemental is the rank of its array argument(s). */
1513 for (arg = arg0; arg; arg = arg->next)
1515 if (arg->expr != NULL && arg->expr->rank > 0)
1517 rank = arg->expr->rank;
1518 if (arg->expr->expr_type == EXPR_VARIABLE
1519 && arg->expr->symtree->n.sym->attr.optional)
1520 set_by_optional = true;
1522 /* Function specific; set the result rank and shape. */
1526 if (!expr->shape && arg->expr->shape)
1528 expr->shape = gfc_get_shape (rank);
1529 for (i = 0; i < rank; i++)
1530 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1537 /* If it is an array, it shall not be supplied as an actual argument
1538 to an elemental procedure unless an array of the same rank is supplied
1539 as an actual argument corresponding to a nonoptional dummy argument of
1540 that elemental procedure(12.4.1.5). */
1541 formal_optional = false;
1543 iformal = isym->formal;
1545 eformal = esym->formal;
1547 for (arg = arg0; arg; arg = arg->next)
1551 if (eformal->sym && eformal->sym->attr.optional)
1552 formal_optional = true;
1553 eformal = eformal->next;
1555 else if (isym && iformal)
1557 if (iformal->optional)
1558 formal_optional = true;
1559 iformal = iformal->next;
1562 formal_optional = true;
1564 if (pedantic && arg->expr != NULL
1565 && arg->expr->expr_type == EXPR_VARIABLE
1566 && arg->expr->symtree->n.sym->attr.optional
1569 && (set_by_optional || arg->expr->rank != rank)
1570 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1572 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1573 "MISSING, it cannot be the actual argument of an "
1574 "ELEMENTAL procedure unless there is a non-optional "
1575 "argument with the same rank (12.4.1.5)",
1576 arg->expr->symtree->n.sym->name, &arg->expr->where);
1581 for (arg = arg0; arg; arg = arg->next)
1583 if (arg->expr == NULL || arg->expr->rank == 0)
1586 /* Being elemental, the last upper bound of an assumed size array
1587 argument must be present. */
1588 if (resolve_assumed_size_actual (arg->expr))
1591 /* Elemental procedure's array actual arguments must conform. */
1594 if (gfc_check_conformance (arg->expr, e,
1595 "elemental procedure") == FAILURE)
1602 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1603 is an array, the intent inout/out variable needs to be also an array. */
1604 if (rank > 0 && esym && expr == NULL)
1605 for (eformal = esym->formal, arg = arg0; arg && eformal;
1606 arg = arg->next, eformal = eformal->next)
1607 if ((eformal->sym->attr.intent == INTENT_OUT
1608 || eformal->sym->attr.intent == INTENT_INOUT)
1609 && arg->expr && arg->expr->rank == 0)
1611 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1612 "ELEMENTAL subroutine '%s' is a scalar, but another "
1613 "actual argument is an array", &arg->expr->where,
1614 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1615 : "INOUT", eformal->sym->name, esym->name);
1622 /* Go through each actual argument in ACTUAL and see if it can be
1623 implemented as an inlined, non-copying intrinsic. FNSYM is the
1624 function being called, or NULL if not known. */
1627 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1629 gfc_actual_arglist *ap;
1632 for (ap = actual; ap; ap = ap->next)
1634 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1635 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1637 ap->expr->inline_noncopying_intrinsic = 1;
1641 /* This function does the checking of references to global procedures
1642 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1643 77 and 95 standards. It checks for a gsymbol for the name, making
1644 one if it does not already exist. If it already exists, then the
1645 reference being resolved must correspond to the type of gsymbol.
1646 Otherwise, the new symbol is equipped with the attributes of the
1647 reference. The corresponding code that is called in creating
1648 global entities is parse.c.
1650 In addition, for all but -std=legacy, the gsymbols are used to
1651 check the interfaces of external procedures from the same file.
1652 The namespace of the gsymbol is resolved and then, once this is
1653 done the interface is checked. */
1656 resolve_global_procedure (gfc_symbol *sym, locus *where,
1657 gfc_actual_arglist **actual, int sub)
1661 enum gfc_symbol_type type;
1663 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1665 gsym = gfc_get_gsymbol (sym->name);
1667 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1668 gfc_global_used (gsym, where);
1670 if (gfc_option.flag_whole_file
1671 && gsym->type != GSYM_UNKNOWN
1673 && gsym->ns->proc_name)
1675 /* Make sure that translation for the gsymbol occurs before
1676 the procedure currently being resolved. */
1677 ns = gsym->ns->resolved ? NULL : gfc_global_ns_list;
1678 for (; ns && ns != gsym->ns; ns = ns->sibling)
1680 if (ns->sibling == gsym->ns)
1682 ns->sibling = gsym->ns->sibling;
1683 gsym->ns->sibling = gfc_global_ns_list;
1684 gfc_global_ns_list = gsym->ns;
1689 if (!gsym->ns->resolved)
1690 gfc_resolve (gsym->ns);
1692 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1695 if (gsym->type == GSYM_UNKNOWN)
1698 gsym->where = *where;
1705 /************* Function resolution *************/
1707 /* Resolve a function call known to be generic.
1708 Section 14.1.2.4.1. */
1711 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1715 if (sym->attr.generic)
1717 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1720 expr->value.function.name = s->name;
1721 expr->value.function.esym = s;
1723 if (s->ts.type != BT_UNKNOWN)
1725 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1726 expr->ts = s->result->ts;
1729 expr->rank = s->as->rank;
1730 else if (s->result != NULL && s->result->as != NULL)
1731 expr->rank = s->result->as->rank;
1733 gfc_set_sym_referenced (expr->value.function.esym);
1738 /* TODO: Need to search for elemental references in generic
1742 if (sym->attr.intrinsic)
1743 return gfc_intrinsic_func_interface (expr, 0);
1750 resolve_generic_f (gfc_expr *expr)
1755 sym = expr->symtree->n.sym;
1759 m = resolve_generic_f0 (expr, sym);
1762 else if (m == MATCH_ERROR)
1766 if (sym->ns->parent == NULL)
1768 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1772 if (!generic_sym (sym))
1776 /* Last ditch attempt. See if the reference is to an intrinsic
1777 that possesses a matching interface. 14.1.2.4 */
1778 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
1780 gfc_error ("There is no specific function for the generic '%s' at %L",
1781 expr->symtree->n.sym->name, &expr->where);
1785 m = gfc_intrinsic_func_interface (expr, 0);
1789 gfc_error ("Generic function '%s' at %L is not consistent with a "
1790 "specific intrinsic interface", expr->symtree->n.sym->name,
1797 /* Resolve a function call known to be specific. */
1800 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
1804 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
1806 if (sym->attr.dummy)
1808 sym->attr.proc = PROC_DUMMY;
1812 sym->attr.proc = PROC_EXTERNAL;
1816 if (sym->attr.proc == PROC_MODULE
1817 || sym->attr.proc == PROC_ST_FUNCTION
1818 || sym->attr.proc == PROC_INTERNAL)
1821 if (sym->attr.intrinsic)
1823 m = gfc_intrinsic_func_interface (expr, 1);
1827 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
1828 "with an intrinsic", sym->name, &expr->where);
1836 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1839 expr->ts = sym->result->ts;
1842 expr->value.function.name = sym->name;
1843 expr->value.function.esym = sym;
1844 if (sym->as != NULL)
1845 expr->rank = sym->as->rank;
1852 resolve_specific_f (gfc_expr *expr)
1857 sym = expr->symtree->n.sym;
1861 m = resolve_specific_f0 (sym, expr);
1864 if (m == MATCH_ERROR)
1867 if (sym->ns->parent == NULL)
1870 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1876 gfc_error ("Unable to resolve the specific function '%s' at %L",
1877 expr->symtree->n.sym->name, &expr->where);
1883 /* Resolve a procedure call not known to be generic nor specific. */
1886 resolve_unknown_f (gfc_expr *expr)
1891 sym = expr->symtree->n.sym;
1893 if (sym->attr.dummy)
1895 sym->attr.proc = PROC_DUMMY;
1896 expr->value.function.name = sym->name;
1900 /* See if we have an intrinsic function reference. */
1902 if (gfc_is_intrinsic (sym, 0, expr->where))
1904 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
1909 /* The reference is to an external name. */
1911 sym->attr.proc = PROC_EXTERNAL;
1912 expr->value.function.name = sym->name;
1913 expr->value.function.esym = expr->symtree->n.sym;
1915 if (sym->as != NULL)
1916 expr->rank = sym->as->rank;
1918 /* Type of the expression is either the type of the symbol or the
1919 default type of the symbol. */
1922 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1924 if (sym->ts.type != BT_UNKNOWN)
1928 ts = gfc_get_default_type (sym->name, sym->ns);
1930 if (ts->type == BT_UNKNOWN)
1932 gfc_error ("Function '%s' at %L has no IMPLICIT type",
1933 sym->name, &expr->where);
1944 /* Return true, if the symbol is an external procedure. */
1946 is_external_proc (gfc_symbol *sym)
1948 if (!sym->attr.dummy && !sym->attr.contained
1949 && !(sym->attr.intrinsic
1950 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
1951 && sym->attr.proc != PROC_ST_FUNCTION
1952 && !sym->attr.use_assoc
1960 /* Figure out if a function reference is pure or not. Also set the name
1961 of the function for a potential error message. Return nonzero if the
1962 function is PURE, zero if not. */
1964 pure_stmt_function (gfc_expr *, gfc_symbol *);
1967 pure_function (gfc_expr *e, const char **name)
1973 if (e->symtree != NULL
1974 && e->symtree->n.sym != NULL
1975 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
1976 return pure_stmt_function (e, e->symtree->n.sym);
1978 if (e->value.function.esym)
1980 pure = gfc_pure (e->value.function.esym);
1981 *name = e->value.function.esym->name;
1983 else if (e->value.function.isym)
1985 pure = e->value.function.isym->pure
1986 || e->value.function.isym->elemental;
1987 *name = e->value.function.isym->name;
1991 /* Implicit functions are not pure. */
1993 *name = e->value.function.name;
2001 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2002 int *f ATTRIBUTE_UNUSED)
2006 /* Don't bother recursing into other statement functions
2007 since they will be checked individually for purity. */
2008 if (e->expr_type != EXPR_FUNCTION
2010 || e->symtree->n.sym == sym
2011 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2014 return pure_function (e, &name) ? false : true;
2019 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2021 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2026 is_scalar_expr_ptr (gfc_expr *expr)
2028 gfc_try retval = SUCCESS;
2033 /* See if we have a gfc_ref, which means we have a substring, array
2034 reference, or a component. */
2035 if (expr->ref != NULL)
2038 while (ref->next != NULL)
2044 if (ref->u.ss.length != NULL
2045 && ref->u.ss.length->length != NULL
2047 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2049 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2051 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2052 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2053 if (end - start + 1 != 1)
2060 if (ref->u.ar.type == AR_ELEMENT)
2062 else if (ref->u.ar.type == AR_FULL)
2064 /* The user can give a full array if the array is of size 1. */
2065 if (ref->u.ar.as != NULL
2066 && ref->u.ar.as->rank == 1
2067 && ref->u.ar.as->type == AS_EXPLICIT
2068 && ref->u.ar.as->lower[0] != NULL
2069 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2070 && ref->u.ar.as->upper[0] != NULL
2071 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2073 /* If we have a character string, we need to check if
2074 its length is one. */
2075 if (expr->ts.type == BT_CHARACTER)
2077 if (expr->ts.cl == NULL
2078 || expr->ts.cl->length == NULL
2079 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1)
2085 /* We have constant lower and upper bounds. If the
2086 difference between is 1, it can be considered a
2088 start = (int) mpz_get_si
2089 (ref->u.ar.as->lower[0]->value.integer);
2090 end = (int) mpz_get_si
2091 (ref->u.ar.as->upper[0]->value.integer);
2092 if (end - start + 1 != 1)
2107 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2109 /* Character string. Make sure it's of length 1. */
2110 if (expr->ts.cl == NULL
2111 || expr->ts.cl->length == NULL
2112 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1) != 0)
2115 else if (expr->rank != 0)
2122 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2123 and, in the case of c_associated, set the binding label based on
2127 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2128 gfc_symbol **new_sym)
2130 char name[GFC_MAX_SYMBOL_LEN + 1];
2131 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2132 int optional_arg = 0, is_pointer = 0;
2133 gfc_try retval = SUCCESS;
2134 gfc_symbol *args_sym;
2135 gfc_typespec *arg_ts;
2137 if (args->expr->expr_type == EXPR_CONSTANT
2138 || args->expr->expr_type == EXPR_OP
2139 || args->expr->expr_type == EXPR_NULL)
2141 gfc_error ("Argument to '%s' at %L is not a variable",
2142 sym->name, &(args->expr->where));
2146 args_sym = args->expr->symtree->n.sym;
2148 /* The typespec for the actual arg should be that stored in the expr
2149 and not necessarily that of the expr symbol (args_sym), because
2150 the actual expression could be a part-ref of the expr symbol. */
2151 arg_ts = &(args->expr->ts);
2153 is_pointer = gfc_is_data_pointer (args->expr);
2155 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2157 /* If the user gave two args then they are providing something for
2158 the optional arg (the second cptr). Therefore, set the name and
2159 binding label to the c_associated for two cptrs. Otherwise,
2160 set c_associated to expect one cptr. */
2164 sprintf (name, "%s_2", sym->name);
2165 sprintf (binding_label, "%s_2", sym->binding_label);
2171 sprintf (name, "%s_1", sym->name);
2172 sprintf (binding_label, "%s_1", sym->binding_label);
2176 /* Get a new symbol for the version of c_associated that
2178 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2180 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2181 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2183 sprintf (name, "%s", sym->name);
2184 sprintf (binding_label, "%s", sym->binding_label);
2186 /* Error check the call. */
2187 if (args->next != NULL)
2189 gfc_error_now ("More actual than formal arguments in '%s' "
2190 "call at %L", name, &(args->expr->where));
2193 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2195 /* Make sure we have either the target or pointer attribute. */
2196 if (!args_sym->attr.target && !is_pointer)
2198 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2199 "a TARGET or an associated pointer",
2201 sym->name, &(args->expr->where));
2205 /* See if we have interoperable type and type param. */
2206 if (verify_c_interop (arg_ts) == SUCCESS
2207 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2209 if (args_sym->attr.target == 1)
2211 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2212 has the target attribute and is interoperable. */
2213 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2214 allocatable variable that has the TARGET attribute and
2215 is not an array of zero size. */
2216 if (args_sym->attr.allocatable == 1)
2218 if (args_sym->attr.dimension != 0
2219 && (args_sym->as && args_sym->as->rank == 0))
2221 gfc_error_now ("Allocatable variable '%s' used as a "
2222 "parameter to '%s' at %L must not be "
2223 "an array of zero size",
2224 args_sym->name, sym->name,
2225 &(args->expr->where));
2231 /* A non-allocatable target variable with C
2232 interoperable type and type parameters must be
2234 if (args_sym && args_sym->attr.dimension)
2236 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2238 gfc_error ("Assumed-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);
2246 else if (args_sym->as->type == AS_DEFERRED)
2248 gfc_error ("Deferred-shape array '%s' at %L "
2249 "cannot be an argument to the "
2250 "procedure '%s' because "
2251 "it is not C interoperable",
2253 &(args->expr->where), sym->name);
2258 /* Make sure it's not a character string. Arrays of
2259 any type should be ok if the variable is of a C
2260 interoperable type. */
2261 if (arg_ts->type == BT_CHARACTER)
2262 if (arg_ts->cl != NULL
2263 && (arg_ts->cl->length == NULL
2264 || arg_ts->cl->length->expr_type
2267 (arg_ts->cl->length->value.integer, 1)
2269 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2271 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2272 "at %L must have a length of 1",
2273 args_sym->name, sym->name,
2274 &(args->expr->where));
2280 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2282 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2284 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2285 "associated scalar POINTER", args_sym->name,
2286 sym->name, &(args->expr->where));
2292 /* The parameter is not required to be C interoperable. If it
2293 is not C interoperable, it must be a nonpolymorphic scalar
2294 with no length type parameters. It still must have either
2295 the pointer or target attribute, and it can be
2296 allocatable (but must be allocated when c_loc is called). */
2297 if (args->expr->rank != 0
2298 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2300 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2301 "scalar", args_sym->name, sym->name,
2302 &(args->expr->where));
2305 else if (arg_ts->type == BT_CHARACTER
2306 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2308 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2309 "%L must have a length of 1",
2310 args_sym->name, sym->name,
2311 &(args->expr->where));
2316 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2318 if (args_sym->attr.flavor != FL_PROCEDURE)
2320 /* TODO: Update this error message to allow for procedure
2321 pointers once they are implemented. */
2322 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2324 args_sym->name, sym->name,
2325 &(args->expr->where));
2328 else if (args_sym->attr.is_bind_c != 1)
2330 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2332 args_sym->name, sym->name,
2333 &(args->expr->where));
2338 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2343 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2344 "iso_c_binding function: '%s'!\n", sym->name);
2351 /* Resolve a function call, which means resolving the arguments, then figuring
2352 out which entity the name refers to. */
2353 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2354 to INTENT(OUT) or INTENT(INOUT). */
2357 resolve_function (gfc_expr *expr)
2359 gfc_actual_arglist *arg;
2364 procedure_type p = PROC_INTRINSIC;
2365 bool no_formal_args;
2369 sym = expr->symtree->n.sym;
2371 if (sym && sym->attr.intrinsic
2372 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2375 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2377 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2381 if (sym && sym->attr.abstract)
2383 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2384 sym->name, &expr->where);
2388 /* Switch off assumed size checking and do this again for certain kinds
2389 of procedure, once the procedure itself is resolved. */
2390 need_full_assumed_size++;
2392 if (expr->symtree && expr->symtree->n.sym)
2393 p = expr->symtree->n.sym->attr.proc;
2395 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2396 if (resolve_actual_arglist (expr->value.function.actual,
2397 p, no_formal_args) == FAILURE)
2400 /* Need to setup the call to the correct c_associated, depending on
2401 the number of cptrs to user gives to compare. */
2402 if (sym && sym->attr.is_iso_c == 1)
2404 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2408 /* Get the symtree for the new symbol (resolved func).
2409 the old one will be freed later, when it's no longer used. */
2410 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2413 /* Resume assumed_size checking. */
2414 need_full_assumed_size--;
2416 /* If the procedure is external, check for usage. */
2417 if (sym && is_external_proc (sym))
2418 resolve_global_procedure (sym, &expr->where,
2419 &expr->value.function.actual, 0);
2421 if (sym && sym->ts.type == BT_CHARACTER
2423 && sym->ts.cl->length == NULL
2425 && expr->value.function.esym == NULL
2426 && !sym->attr.contained)
2428 /* Internal procedures are taken care of in resolve_contained_fntype. */
2429 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2430 "be used at %L since it is not a dummy argument",
2431 sym->name, &expr->where);
2435 /* See if function is already resolved. */
2437 if (expr->value.function.name != NULL)
2439 if (expr->ts.type == BT_UNKNOWN)
2445 /* Apply the rules of section 14.1.2. */
2447 switch (procedure_kind (sym))
2450 t = resolve_generic_f (expr);
2453 case PTYPE_SPECIFIC:
2454 t = resolve_specific_f (expr);
2458 t = resolve_unknown_f (expr);
2462 gfc_internal_error ("resolve_function(): bad function type");
2466 /* If the expression is still a function (it might have simplified),
2467 then we check to see if we are calling an elemental function. */
2469 if (expr->expr_type != EXPR_FUNCTION)
2472 temp = need_full_assumed_size;
2473 need_full_assumed_size = 0;
2475 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2478 if (omp_workshare_flag
2479 && expr->value.function.esym
2480 && ! gfc_elemental (expr->value.function.esym))
2482 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2483 "in WORKSHARE construct", expr->value.function.esym->name,
2488 #define GENERIC_ID expr->value.function.isym->id
2489 else if (expr->value.function.actual != NULL
2490 && expr->value.function.isym != NULL
2491 && GENERIC_ID != GFC_ISYM_LBOUND
2492 && GENERIC_ID != GFC_ISYM_LEN
2493 && GENERIC_ID != GFC_ISYM_LOC
2494 && GENERIC_ID != GFC_ISYM_PRESENT)
2496 /* Array intrinsics must also have the last upper bound of an
2497 assumed size array argument. UBOUND and SIZE have to be
2498 excluded from the check if the second argument is anything
2501 for (arg = expr->value.function.actual; arg; arg = arg->next)
2503 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2504 && arg->next != NULL && arg->next->expr)
2506 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2509 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2512 if ((int)mpz_get_si (arg->next->expr->value.integer)
2517 if (arg->expr != NULL
2518 && arg->expr->rank > 0
2519 && resolve_assumed_size_actual (arg->expr))
2525 need_full_assumed_size = temp;
2528 if (!pure_function (expr, &name) && name)
2532 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2533 "FORALL %s", name, &expr->where,
2534 forall_flag == 2 ? "mask" : "block");
2537 else if (gfc_pure (NULL))
2539 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2540 "procedure within a PURE procedure", name, &expr->where);
2545 /* Functions without the RECURSIVE attribution are not allowed to
2546 * call themselves. */
2547 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2550 esym = expr->value.function.esym;
2552 if (is_illegal_recursion (esym, gfc_current_ns))
2554 if (esym->attr.entry && esym->ns->entries)
2555 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2556 " function '%s' is not RECURSIVE",
2557 esym->name, &expr->where, esym->ns->entries->sym->name);
2559 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2560 " is not RECURSIVE", esym->name, &expr->where);
2566 /* Character lengths of use associated functions may contains references to
2567 symbols not referenced from the current program unit otherwise. Make sure
2568 those symbols are marked as referenced. */
2570 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2571 && expr->value.function.esym->attr.use_assoc)
2573 gfc_expr_set_symbols_referenced (expr->ts.cl->length);
2577 && !((expr->value.function.esym
2578 && expr->value.function.esym->attr.elemental)
2580 (expr->value.function.isym
2581 && expr->value.function.isym->elemental)))
2582 find_noncopying_intrinsics (expr->value.function.esym,
2583 expr->value.function.actual);
2585 /* Make sure that the expression has a typespec that works. */
2586 if (expr->ts.type == BT_UNKNOWN)
2588 if (expr->symtree->n.sym->result
2589 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2590 && !expr->symtree->n.sym->result->attr.proc_pointer)
2591 expr->ts = expr->symtree->n.sym->result->ts;
2598 /************* Subroutine resolution *************/
2601 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2607 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2608 sym->name, &c->loc);
2609 else if (gfc_pure (NULL))
2610 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2616 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2620 if (sym->attr.generic)
2622 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2625 c->resolved_sym = s;
2626 pure_subroutine (c, s);
2630 /* TODO: Need to search for elemental references in generic interface. */
2633 if (sym->attr.intrinsic)
2634 return gfc_intrinsic_sub_interface (c, 0);
2641 resolve_generic_s (gfc_code *c)
2646 sym = c->symtree->n.sym;
2650 m = resolve_generic_s0 (c, sym);
2653 else if (m == MATCH_ERROR)
2657 if (sym->ns->parent == NULL)
2659 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2663 if (!generic_sym (sym))
2667 /* Last ditch attempt. See if the reference is to an intrinsic
2668 that possesses a matching interface. 14.1.2.4 */
2669 sym = c->symtree->n.sym;
2671 if (!gfc_is_intrinsic (sym, 1, c->loc))
2673 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2674 sym->name, &c->loc);
2678 m = gfc_intrinsic_sub_interface (c, 0);
2682 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2683 "intrinsic subroutine interface", sym->name, &c->loc);
2689 /* Set the name and binding label of the subroutine symbol in the call
2690 expression represented by 'c' to include the type and kind of the
2691 second parameter. This function is for resolving the appropriate
2692 version of c_f_pointer() and c_f_procpointer(). For example, a
2693 call to c_f_pointer() for a default integer pointer could have a
2694 name of c_f_pointer_i4. If no second arg exists, which is an error
2695 for these two functions, it defaults to the generic symbol's name
2696 and binding label. */
2699 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2700 char *name, char *binding_label)
2702 gfc_expr *arg = NULL;
2706 /* The second arg of c_f_pointer and c_f_procpointer determines
2707 the type and kind for the procedure name. */
2708 arg = c->ext.actual->next->expr;
2712 /* Set up the name to have the given symbol's name,
2713 plus the type and kind. */
2714 /* a derived type is marked with the type letter 'u' */
2715 if (arg->ts.type == BT_DERIVED)
2718 kind = 0; /* set the kind as 0 for now */
2722 type = gfc_type_letter (arg->ts.type);
2723 kind = arg->ts.kind;
2726 if (arg->ts.type == BT_CHARACTER)
2727 /* Kind info for character strings not needed. */
2730 sprintf (name, "%s_%c%d", sym->name, type, kind);
2731 /* Set up the binding label as the given symbol's label plus
2732 the type and kind. */
2733 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2737 /* If the second arg is missing, set the name and label as
2738 was, cause it should at least be found, and the missing
2739 arg error will be caught by compare_parameters(). */
2740 sprintf (name, "%s", sym->name);
2741 sprintf (binding_label, "%s", sym->binding_label);
2748 /* Resolve a generic version of the iso_c_binding procedure given
2749 (sym) to the specific one based on the type and kind of the
2750 argument(s). Currently, this function resolves c_f_pointer() and
2751 c_f_procpointer based on the type and kind of the second argument
2752 (FPTR). Other iso_c_binding procedures aren't specially handled.
2753 Upon successfully exiting, c->resolved_sym will hold the resolved
2754 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2758 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2760 gfc_symbol *new_sym;
2761 /* this is fine, since we know the names won't use the max */
2762 char name[GFC_MAX_SYMBOL_LEN + 1];
2763 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2764 /* default to success; will override if find error */
2765 match m = MATCH_YES;
2767 /* Make sure the actual arguments are in the necessary order (based on the
2768 formal args) before resolving. */
2769 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2771 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2772 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2774 set_name_and_label (c, sym, name, binding_label);
2776 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2778 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
2780 /* Make sure we got a third arg if the second arg has non-zero
2781 rank. We must also check that the type and rank are
2782 correct since we short-circuit this check in
2783 gfc_procedure_use() (called above to sort actual args). */
2784 if (c->ext.actual->next->expr->rank != 0)
2786 if(c->ext.actual->next->next == NULL
2787 || c->ext.actual->next->next->expr == NULL)
2790 gfc_error ("Missing SHAPE parameter for call to %s "
2791 "at %L", sym->name, &(c->loc));
2793 else if (c->ext.actual->next->next->expr->ts.type
2795 || c->ext.actual->next->next->expr->rank != 1)
2798 gfc_error ("SHAPE parameter for call to %s at %L must "
2799 "be a rank 1 INTEGER array", sym->name,
2806 if (m != MATCH_ERROR)
2808 /* the 1 means to add the optional arg to formal list */
2809 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
2811 /* for error reporting, say it's declared where the original was */
2812 new_sym->declared_at = sym->declared_at;
2817 /* no differences for c_loc or c_funloc */
2821 /* set the resolved symbol */
2822 if (m != MATCH_ERROR)
2823 c->resolved_sym = new_sym;
2825 c->resolved_sym = sym;
2831 /* Resolve a subroutine call known to be specific. */
2834 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
2838 if(sym->attr.is_iso_c)
2840 m = gfc_iso_c_sub_interface (c,sym);
2844 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2846 if (sym->attr.dummy)
2848 sym->attr.proc = PROC_DUMMY;
2852 sym->attr.proc = PROC_EXTERNAL;
2856 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
2859 if (sym->attr.intrinsic)
2861 m = gfc_intrinsic_sub_interface (c, 1);
2865 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
2866 "with an intrinsic", sym->name, &c->loc);
2874 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2876 c->resolved_sym = sym;
2877 pure_subroutine (c, sym);
2884 resolve_specific_s (gfc_code *c)
2889 sym = c->symtree->n.sym;
2893 m = resolve_specific_s0 (c, sym);
2896 if (m == MATCH_ERROR)
2899 if (sym->ns->parent == NULL)
2902 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2908 sym = c->symtree->n.sym;
2909 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
2910 sym->name, &c->loc);
2916 /* Resolve a subroutine call not known to be generic nor specific. */
2919 resolve_unknown_s (gfc_code *c)
2923 sym = c->symtree->n.sym;
2925 if (sym->attr.dummy)
2927 sym->attr.proc = PROC_DUMMY;
2931 /* See if we have an intrinsic function reference. */
2933 if (gfc_is_intrinsic (sym, 1, c->loc))
2935 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
2940 /* The reference is to an external name. */
2943 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2945 c->resolved_sym = sym;
2947 pure_subroutine (c, sym);
2953 /* Resolve a subroutine call. Although it was tempting to use the same code
2954 for functions, subroutines and functions are stored differently and this
2955 makes things awkward. */
2958 resolve_call (gfc_code *c)
2961 procedure_type ptype = PROC_INTRINSIC;
2962 gfc_symbol *csym, *sym;
2963 bool no_formal_args;
2965 csym = c->symtree ? c->symtree->n.sym : NULL;
2967 if (csym && csym->ts.type != BT_UNKNOWN)
2969 gfc_error ("'%s' at %L has a type, which is not consistent with "
2970 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
2974 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
2977 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
2978 sym = st ? st->n.sym : NULL;
2979 if (sym && csym != sym
2980 && sym->ns == gfc_current_ns
2981 && sym->attr.flavor == FL_PROCEDURE
2982 && sym->attr.contained)
2985 if (csym->attr.generic)
2986 c->symtree->n.sym = sym;
2989 csym = c->symtree->n.sym;
2993 /* Subroutines without the RECURSIVE attribution are not allowed to
2994 * call themselves. */
2995 if (csym && is_illegal_recursion (csym, gfc_current_ns))
2997 if (csym->attr.entry && csym->ns->entries)
2998 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2999 " subroutine '%s' is not RECURSIVE",
3000 csym->name, &c->loc, csym->ns->entries->sym->name);
3002 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3003 " is not RECURSIVE", csym->name, &c->loc);
3008 /* Switch off assumed size checking and do this again for certain kinds
3009 of procedure, once the procedure itself is resolved. */
3010 need_full_assumed_size++;
3013 ptype = csym->attr.proc;
3015 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3016 if (resolve_actual_arglist (c->ext.actual, ptype,
3017 no_formal_args) == FAILURE)
3020 /* Resume assumed_size checking. */
3021 need_full_assumed_size--;
3023 /* If external, check for usage. */
3024 if (csym && is_external_proc (csym))
3025 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3028 if (c->resolved_sym == NULL)
3030 c->resolved_isym = NULL;
3031 switch (procedure_kind (csym))
3034 t = resolve_generic_s (c);
3037 case PTYPE_SPECIFIC:
3038 t = resolve_specific_s (c);
3042 t = resolve_unknown_s (c);
3046 gfc_internal_error ("resolve_subroutine(): bad function type");
3050 /* Some checks of elemental subroutine actual arguments. */
3051 if (resolve_elemental_actual (NULL, c) == FAILURE)
3054 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3055 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3060 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3061 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3062 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3063 if their shapes do not match. If either op1->shape or op2->shape is
3064 NULL, return SUCCESS. */
3067 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3074 if (op1->shape != NULL && op2->shape != NULL)
3076 for (i = 0; i < op1->rank; i++)
3078 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3080 gfc_error ("Shapes for operands at %L and %L are not conformable",
3081 &op1->where, &op2->where);
3092 /* Resolve an operator expression node. This can involve replacing the
3093 operation with a user defined function call. */
3096 resolve_operator (gfc_expr *e)
3098 gfc_expr *op1, *op2;
3100 bool dual_locus_error;
3103 /* Resolve all subnodes-- give them types. */
3105 switch (e->value.op.op)
3108 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3111 /* Fall through... */
3114 case INTRINSIC_UPLUS:
3115 case INTRINSIC_UMINUS:
3116 case INTRINSIC_PARENTHESES:
3117 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3122 /* Typecheck the new node. */
3124 op1 = e->value.op.op1;
3125 op2 = e->value.op.op2;
3126 dual_locus_error = false;
3128 if ((op1 && op1->expr_type == EXPR_NULL)
3129 || (op2 && op2->expr_type == EXPR_NULL))
3131 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3135 switch (e->value.op.op)
3137 case INTRINSIC_UPLUS:
3138 case INTRINSIC_UMINUS:
3139 if (op1->ts.type == BT_INTEGER
3140 || op1->ts.type == BT_REAL
3141 || op1->ts.type == BT_COMPLEX)
3147 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3148 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3151 case INTRINSIC_PLUS:
3152 case INTRINSIC_MINUS:
3153 case INTRINSIC_TIMES:
3154 case INTRINSIC_DIVIDE:
3155 case INTRINSIC_POWER:
3156 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3158 gfc_type_convert_binary (e);
3163 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3164 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3165 gfc_typename (&op2->ts));
3168 case INTRINSIC_CONCAT:
3169 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3170 && op1->ts.kind == op2->ts.kind)
3172 e->ts.type = BT_CHARACTER;
3173 e->ts.kind = op1->ts.kind;
3178 _("Operands of string concatenation operator at %%L are %s/%s"),
3179 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3185 case INTRINSIC_NEQV:
3186 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3188 e->ts.type = BT_LOGICAL;
3189 e->ts.kind = gfc_kind_max (op1, op2);
3190 if (op1->ts.kind < e->ts.kind)
3191 gfc_convert_type (op1, &e->ts, 2);
3192 else if (op2->ts.kind < e->ts.kind)
3193 gfc_convert_type (op2, &e->ts, 2);
3197 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3198 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3199 gfc_typename (&op2->ts));
3204 if (op1->ts.type == BT_LOGICAL)
3206 e->ts.type = BT_LOGICAL;
3207 e->ts.kind = op1->ts.kind;
3211 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3212 gfc_typename (&op1->ts));
3216 case INTRINSIC_GT_OS:
3218 case INTRINSIC_GE_OS:
3220 case INTRINSIC_LT_OS:
3222 case INTRINSIC_LE_OS:
3223 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3225 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3229 /* Fall through... */
3232 case INTRINSIC_EQ_OS:
3234 case INTRINSIC_NE_OS:
3235 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3236 && op1->ts.kind == op2->ts.kind)
3238 e->ts.type = BT_LOGICAL;
3239 e->ts.kind = gfc_default_logical_kind;
3243 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3245 gfc_type_convert_binary (e);
3247 e->ts.type = BT_LOGICAL;
3248 e->ts.kind = gfc_default_logical_kind;
3252 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3254 _("Logicals at %%L must be compared with %s instead of %s"),
3255 (e->value.op.op == INTRINSIC_EQ
3256 || e->value.op.op == INTRINSIC_EQ_OS)
3257 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3260 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3261 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3262 gfc_typename (&op2->ts));
3266 case INTRINSIC_USER:
3267 if (e->value.op.uop->op == NULL)
3268 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3269 else if (op2 == NULL)
3270 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3271 e->value.op.uop->name, gfc_typename (&op1->ts));
3273 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3274 e->value.op.uop->name, gfc_typename (&op1->ts),
3275 gfc_typename (&op2->ts));
3279 case INTRINSIC_PARENTHESES:
3281 if (e->ts.type == BT_CHARACTER)
3282 e->ts.cl = op1->ts.cl;
3286 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3289 /* Deal with arrayness of an operand through an operator. */
3293 switch (e->value.op.op)
3295 case INTRINSIC_PLUS:
3296 case INTRINSIC_MINUS:
3297 case INTRINSIC_TIMES:
3298 case INTRINSIC_DIVIDE:
3299 case INTRINSIC_POWER:
3300 case INTRINSIC_CONCAT:
3304 case INTRINSIC_NEQV:
3306 case INTRINSIC_EQ_OS:
3308 case INTRINSIC_NE_OS:
3310 case INTRINSIC_GT_OS:
3312 case INTRINSIC_GE_OS:
3314 case INTRINSIC_LT_OS:
3316 case INTRINSIC_LE_OS:
3318 if (op1->rank == 0 && op2->rank == 0)
3321 if (op1->rank == 0 && op2->rank != 0)
3323 e->rank = op2->rank;
3325 if (e->shape == NULL)
3326 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3329 if (op1->rank != 0 && op2->rank == 0)
3331 e->rank = op1->rank;
3333 if (e->shape == NULL)
3334 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3337 if (op1->rank != 0 && op2->rank != 0)
3339 if (op1->rank == op2->rank)
3341 e->rank = op1->rank;
3342 if (e->shape == NULL)
3344 t = compare_shapes(op1, op2);
3348 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3353 /* Allow higher level expressions to work. */
3356 /* Try user-defined operators, and otherwise throw an error. */
3357 dual_locus_error = true;
3359 _("Inconsistent ranks for operator at %%L and %%L"));
3366 case INTRINSIC_PARENTHESES:
3368 case INTRINSIC_UPLUS:
3369 case INTRINSIC_UMINUS:
3370 /* Simply copy arrayness attribute */
3371 e->rank = op1->rank;
3373 if (e->shape == NULL)
3374 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3382 /* Attempt to simplify the expression. */
3385 t = gfc_simplify_expr (e, 0);
3386 /* Some calls do not succeed in simplification and return FAILURE
3387 even though there is no error; e.g. variable references to
3388 PARAMETER arrays. */
3389 if (!gfc_is_constant_expr (e))
3396 if (gfc_extend_expr (e) == SUCCESS)
3399 if (dual_locus_error)
3400 gfc_error (msg, &op1->where, &op2->where);
3402 gfc_error (msg, &e->where);
3408 /************** Array resolution subroutines **************/
3411 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3414 /* Compare two integer expressions. */
3417 compare_bound (gfc_expr *a, gfc_expr *b)
3421 if (a == NULL || a->expr_type != EXPR_CONSTANT
3422 || b == NULL || b->expr_type != EXPR_CONSTANT)
3425 /* If either of the types isn't INTEGER, we must have
3426 raised an error earlier. */
3428 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3431 i = mpz_cmp (a->value.integer, b->value.integer);
3441 /* Compare an integer expression with an integer. */
3444 compare_bound_int (gfc_expr *a, int b)
3448 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3451 if (a->ts.type != BT_INTEGER)
3452 gfc_internal_error ("compare_bound_int(): Bad expression");
3454 i = mpz_cmp_si (a->value.integer, b);
3464 /* Compare an integer expression with a mpz_t. */
3467 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3471 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3474 if (a->ts.type != BT_INTEGER)
3475 gfc_internal_error ("compare_bound_int(): Bad expression");
3477 i = mpz_cmp (a->value.integer, b);
3487 /* Compute the last value of a sequence given by a triplet.
3488 Return 0 if it wasn't able to compute the last value, or if the
3489 sequence if empty, and 1 otherwise. */
3492 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3493 gfc_expr *stride, mpz_t last)
3497 if (start == NULL || start->expr_type != EXPR_CONSTANT
3498 || end == NULL || end->expr_type != EXPR_CONSTANT
3499 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3502 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3503 || (stride != NULL && stride->ts.type != BT_INTEGER))
3506 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3508 if (compare_bound (start, end) == CMP_GT)
3510 mpz_set (last, end->value.integer);
3514 if (compare_bound_int (stride, 0) == CMP_GT)
3516 /* Stride is positive */
3517 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3522 /* Stride is negative */
3523 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3528 mpz_sub (rem, end->value.integer, start->value.integer);
3529 mpz_tdiv_r (rem, rem, stride->value.integer);
3530 mpz_sub (last, end->value.integer, rem);
3537 /* Compare a single dimension of an array reference to the array
3541 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3545 /* Given start, end and stride values, calculate the minimum and
3546 maximum referenced indexes. */
3548 switch (ar->dimen_type[i])
3554 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3556 gfc_warning ("Array reference at %L is out of bounds "
3557 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3558 mpz_get_si (ar->start[i]->value.integer),
3559 mpz_get_si (as->lower[i]->value.integer), i+1);
3562 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3564 gfc_warning ("Array reference at %L is out of bounds "
3565 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3566 mpz_get_si (ar->start[i]->value.integer),
3567 mpz_get_si (as->upper[i]->value.integer), i+1);
3575 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3576 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3578 comparison comp_start_end = compare_bound (AR_START, AR_END);
3580 /* Check for zero stride, which is not allowed. */
3581 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3583 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3587 /* if start == len || (stride > 0 && start < len)
3588 || (stride < 0 && start > len),
3589 then the array section contains at least one element. In this
3590 case, there is an out-of-bounds access if
3591 (start < lower || start > upper). */
3592 if (compare_bound (AR_START, AR_END) == CMP_EQ
3593 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3594 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3595 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3596 && comp_start_end == CMP_GT))
3598 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3600 gfc_warning ("Lower array reference at %L is out of bounds "
3601 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3602 mpz_get_si (AR_START->value.integer),
3603 mpz_get_si (as->lower[i]->value.integer), i+1);
3606 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3608 gfc_warning ("Lower array reference at %L is out of bounds "
3609 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3610 mpz_get_si (AR_START->value.integer),
3611 mpz_get_si (as->upper[i]->value.integer), i+1);
3616 /* If we can compute the highest index of the array section,
3617 then it also has to be between lower and upper. */
3618 mpz_init (last_value);
3619 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3622 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3624 gfc_warning ("Upper array reference at %L is out of bounds "
3625 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3626 mpz_get_si (last_value),
3627 mpz_get_si (as->lower[i]->value.integer), i+1);
3628 mpz_clear (last_value);
3631 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3633 gfc_warning ("Upper array reference at %L is out of bounds "
3634 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3635 mpz_get_si (last_value),
3636 mpz_get_si (as->upper[i]->value.integer), i+1);
3637 mpz_clear (last_value);
3641 mpz_clear (last_value);
3649 gfc_internal_error ("check_dimension(): Bad array reference");
3656 /* Compare an array reference with an array specification. */
3659 compare_spec_to_ref (gfc_array_ref *ar)
3666 /* TODO: Full array sections are only allowed as actual parameters. */
3667 if (as->type == AS_ASSUMED_SIZE
3668 && (/*ar->type == AR_FULL
3669 ||*/ (ar->type == AR_SECTION
3670 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3672 gfc_error ("Rightmost upper bound of assumed size array section "
3673 "not specified at %L", &ar->where);
3677 if (ar->type == AR_FULL)
3680 if (as->rank != ar->dimen)
3682 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3683 &ar->where, ar->dimen, as->rank);
3687 for (i = 0; i < as->rank; i++)
3688 if (check_dimension (i, ar, as) == FAILURE)
3695 /* Resolve one part of an array index. */
3698 gfc_resolve_index (gfc_expr *index, int check_scalar)
3705 if (gfc_resolve_expr (index) == FAILURE)
3708 if (check_scalar && index->rank != 0)
3710 gfc_error ("Array index at %L must be scalar", &index->where);
3714 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
3716 gfc_error ("Array index at %L must be of INTEGER type, found %s",
3717 &index->where, gfc_basic_typename (index->ts.type));
3721 if (index->ts.type == BT_REAL)
3722 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
3723 &index->where) == FAILURE)
3726 if (index->ts.kind != gfc_index_integer_kind
3727 || index->ts.type != BT_INTEGER)
3730 ts.type = BT_INTEGER;
3731 ts.kind = gfc_index_integer_kind;
3733 gfc_convert_type_warn (index, &ts, 2, 0);
3739 /* Resolve a dim argument to an intrinsic function. */
3742 gfc_resolve_dim_arg (gfc_expr *dim)
3747 if (gfc_resolve_expr (dim) == FAILURE)
3752 gfc_error ("Argument dim at %L must be scalar", &dim->where);
3757 if (dim->ts.type != BT_INTEGER)
3759 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
3763 if (dim->ts.kind != gfc_index_integer_kind)
3767 ts.type = BT_INTEGER;
3768 ts.kind = gfc_index_integer_kind;
3770 gfc_convert_type_warn (dim, &ts, 2, 0);
3776 /* Given an expression that contains array references, update those array
3777 references to point to the right array specifications. While this is
3778 filled in during matching, this information is difficult to save and load
3779 in a module, so we take care of it here.
3781 The idea here is that the original array reference comes from the
3782 base symbol. We traverse the list of reference structures, setting
3783 the stored reference to references. Component references can
3784 provide an additional array specification. */
3787 find_array_spec (gfc_expr *e)
3791 gfc_symbol *derived;
3794 as = e->symtree->n.sym->as;
3797 for (ref = e->ref; ref; ref = ref->next)
3802 gfc_internal_error ("find_array_spec(): Missing spec");
3809 if (derived == NULL)
3810 derived = e->symtree->n.sym->ts.derived;
3812 c = derived->components;
3814 for (; c; c = c->next)
3815 if (c == ref->u.c.component)
3817 /* Track the sequence of component references. */
3818 if (c->ts.type == BT_DERIVED)
3819 derived = c->ts.derived;
3824 gfc_internal_error ("find_array_spec(): Component not found");
3826 if (c->attr.dimension)
3829 gfc_internal_error ("find_array_spec(): unused as(1)");
3840 gfc_internal_error ("find_array_spec(): unused as(2)");
3844 /* Resolve an array reference. */
3847 resolve_array_ref (gfc_array_ref *ar)
3849 int i, check_scalar;
3852 for (i = 0; i < ar->dimen; i++)
3854 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
3856 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
3858 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
3860 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
3865 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
3869 ar->dimen_type[i] = DIMEN_ELEMENT;
3873 ar->dimen_type[i] = DIMEN_VECTOR;
3874 if (e->expr_type == EXPR_VARIABLE
3875 && e->symtree->n.sym->ts.type == BT_DERIVED)
3876 ar->start[i] = gfc_get_parentheses (e);
3880 gfc_error ("Array index at %L is an array of rank %d",
3881 &ar->c_where[i], e->rank);
3886 /* If the reference type is unknown, figure out what kind it is. */
3888 if (ar->type == AR_UNKNOWN)
3890 ar->type = AR_ELEMENT;
3891 for (i = 0; i < ar->dimen; i++)
3892 if (ar->dimen_type[i] == DIMEN_RANGE
3893 || ar->dimen_type[i] == DIMEN_VECTOR)
3895 ar->type = AR_SECTION;
3900 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
3908 resolve_substring (gfc_ref *ref)
3910 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
3912 if (ref->u.ss.start != NULL)
3914 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
3917 if (ref->u.ss.start->ts.type != BT_INTEGER)
3919 gfc_error ("Substring start index at %L must be of type INTEGER",
3920 &ref->u.ss.start->where);
3924 if (ref->u.ss.start->rank != 0)
3926 gfc_error ("Substring start index at %L must be scalar",
3927 &ref->u.ss.start->where);
3931 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
3932 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3933 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3935 gfc_error ("Substring start index at %L is less than one",
3936 &ref->u.ss.start->where);
3941 if (ref->u.ss.end != NULL)
3943 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
3946 if (ref->u.ss.end->ts.type != BT_INTEGER)
3948 gfc_error ("Substring end index at %L must be of type INTEGER",
3949 &ref->u.ss.end->where);
3953 if (ref->u.ss.end->rank != 0)
3955 gfc_error ("Substring end index at %L must be scalar",
3956 &ref->u.ss.end->where);
3960 if (ref->u.ss.length != NULL
3961 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == 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 exceeds the string length",
3966 &ref->u.ss.start->where);
3970 if (compare_bound_mpz_t (ref->u.ss.end,
3971 gfc_integer_kinds[k].huge) == CMP_GT
3972 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3973 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3975 gfc_error ("Substring end index at %L is too large",
3976 &ref->u.ss.end->where);
3985 /* This function supplies missing substring charlens. */
3988 gfc_resolve_substring_charlen (gfc_expr *e)
3991 gfc_expr *start, *end;
3993 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
3994 if (char_ref->type == REF_SUBSTRING)
4000 gcc_assert (char_ref->next == NULL);
4004 if (e->ts.cl->length)
4005 gfc_free_expr (e->ts.cl->length);
4006 else if (e->expr_type == EXPR_VARIABLE
4007 && e->symtree->n.sym->attr.dummy)
4011 e->ts.type = BT_CHARACTER;
4012 e->ts.kind = gfc_default_character_kind;
4015 e->ts.cl = gfc_new_charlen (gfc_current_ns);
4017 if (char_ref->u.ss.start)
4018 start = gfc_copy_expr (char_ref->u.ss.start);
4020 start = gfc_int_expr (1);
4022 if (char_ref->u.ss.end)
4023 end = gfc_copy_expr (char_ref->u.ss.end);
4024 else if (e->expr_type == EXPR_VARIABLE)
4025 end = gfc_copy_expr (e->symtree->n.sym->ts.cl->length);
4032 /* Length = (end - start +1). */
4033 e->ts.cl->length = gfc_subtract (end, start);
4034 e->ts.cl->length = gfc_add (e->ts.cl->length, gfc_int_expr (1));
4036 e->ts.cl->length->ts.type = BT_INTEGER;
4037 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;
4039 /* Make sure that the length is simplified. */
4040 gfc_simplify_expr (e->ts.cl->length, 1);
4041 gfc_resolve_expr (e->ts.cl->length);
4045 /* Resolve subtype references. */
4048 resolve_ref (gfc_expr *expr)
4050 int current_part_dimension, n_components, seen_part_dimension;
4053 for (ref = expr->ref; ref; ref = ref->next)
4054 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4056 find_array_spec (expr);
4060 for (ref = expr->ref; ref; ref = ref->next)
4064 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4072 resolve_substring (ref);
4076 /* Check constraints on part references. */
4078 current_part_dimension = 0;
4079 seen_part_dimension = 0;
4082 for (ref = expr->ref; ref; ref = ref->next)
4087 switch (ref->u.ar.type)
4091 current_part_dimension = 1;
4095 current_part_dimension = 0;
4099 gfc_internal_error ("resolve_ref(): Bad array reference");
4105 if (current_part_dimension || seen_part_dimension)
4107 if (ref->u.c.component->attr.pointer)
4109 gfc_error ("Component to the right of a part reference "
4110 "with nonzero rank must not have the POINTER "
4111 "attribute at %L", &expr->where);
4114 else if (ref->u.c.component->attr.allocatable)
4116 gfc_error ("Component to the right of a part reference "
4117 "with nonzero rank must not have the ALLOCATABLE "
4118 "attribute at %L", &expr->where);
4130 if (((ref->type == REF_COMPONENT && n_components > 1)
4131 || ref->next == NULL)
4132 && current_part_dimension
4133 && seen_part_dimension)
4135 gfc_error ("Two or more part references with nonzero rank must "
4136 "not be specified at %L", &expr->where);
4140 if (ref->type == REF_COMPONENT)
4142 if (current_part_dimension)
4143 seen_part_dimension = 1;
4145 /* reset to make sure */
4146 current_part_dimension = 0;
4154 /* Given an expression, determine its shape. This is easier than it sounds.
4155 Leaves the shape array NULL if it is not possible to determine the shape. */
4158 expression_shape (gfc_expr *e)
4160 mpz_t array[GFC_MAX_DIMENSIONS];
4163 if (e->rank == 0 || e->shape != NULL)
4166 for (i = 0; i < e->rank; i++)
4167 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4170 e->shape = gfc_get_shape (e->rank);
4172 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4177 for (i--; i >= 0; i--)
4178 mpz_clear (array[i]);
4182 /* Given a variable expression node, compute the rank of the expression by
4183 examining the base symbol and any reference structures it may have. */
4186 expression_rank (gfc_expr *e)
4191 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4192 could lead to serious confusion... */
4193 gcc_assert (e->expr_type != EXPR_COMPCALL);
4197 if (e->expr_type == EXPR_ARRAY)
4199 /* Constructors can have a rank different from one via RESHAPE(). */
4201 if (e->symtree == NULL)
4207 e->rank = (e->symtree->n.sym->as == NULL)
4208 ? 0 : e->symtree->n.sym->as->rank;
4214 for (ref = e->ref; ref; ref = ref->next)
4216 if (ref->type != REF_ARRAY)
4219 if (ref->u.ar.type == AR_FULL)
4221 rank = ref->u.ar.as->rank;
4225 if (ref->u.ar.type == AR_SECTION)
4227 /* Figure out the rank of the section. */
4229 gfc_internal_error ("expression_rank(): Two array specs");
4231 for (i = 0; i < ref->u.ar.dimen; i++)
4232 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4233 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4243 expression_shape (e);
4247 /* Resolve a variable expression. */
4250 resolve_variable (gfc_expr *e)
4257 if (e->symtree == NULL)
4260 if (e->ref && resolve_ref (e) == FAILURE)
4263 sym = e->symtree->n.sym;
4264 if (sym->attr.flavor == FL_PROCEDURE
4265 && (!sym->attr.function
4266 || (sym->attr.function && sym->result
4267 && sym->result->attr.proc_pointer
4268 && !sym->result->attr.function)))
4270 e->ts.type = BT_PROCEDURE;
4271 goto resolve_procedure;
4274 if (sym->ts.type != BT_UNKNOWN)
4275 gfc_variable_attr (e, &e->ts);
4278 /* Must be a simple variable reference. */
4279 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4284 if (check_assumed_size_reference (sym, e))
4287 /* Deal with forward references to entries during resolve_code, to
4288 satisfy, at least partially, 12.5.2.5. */
4289 if (gfc_current_ns->entries
4290 && current_entry_id == sym->entry_id
4293 && cs_base->current->op != EXEC_ENTRY)
4295 gfc_entry_list *entry;
4296 gfc_formal_arglist *formal;
4300 /* If the symbol is a dummy... */
4301 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4303 entry = gfc_current_ns->entries;
4306 /* ...test if the symbol is a parameter of previous entries. */
4307 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4308 for (formal = entry->sym->formal; formal; formal = formal->next)
4310 if (formal->sym && sym->name == formal->sym->name)
4314 /* If it has not been seen as a dummy, this is an error. */
4317 if (specification_expr)
4318 gfc_error ("Variable '%s', used in a specification expression"
4319 ", is referenced at %L before the ENTRY statement "
4320 "in which it is a parameter",
4321 sym->name, &cs_base->current->loc);
4323 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4324 "statement in which it is a parameter",
4325 sym->name, &cs_base->current->loc);
4330 /* Now do the same check on the specification expressions. */
4331 specification_expr = 1;
4332 if (sym->ts.type == BT_CHARACTER
4333 && gfc_resolve_expr (sym->ts.cl->length) == FAILURE)
4337 for (n = 0; n < sym->as->rank; n++)
4339 specification_expr = 1;
4340 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4342 specification_expr = 1;
4343 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4346 specification_expr = 0;
4349 /* Update the symbol's entry level. */
4350 sym->entry_id = current_entry_id + 1;
4354 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4361 /* Checks to see that the correct symbol has been host associated.
4362 The only situation where this arises is that in which a twice
4363 contained function is parsed after the host association is made.
4364 Therefore, on detecting this, change the symbol in the expression
4365 and convert the array reference into an actual arglist if the old
4366 symbol is a variable. */
4368 check_host_association (gfc_expr *e)
4370 gfc_symbol *sym, *old_sym;
4374 gfc_actual_arglist *arg, *tail = NULL;
4375 bool retval = e->expr_type == EXPR_FUNCTION;
4377 /* If the expression is the result of substitution in
4378 interface.c(gfc_extend_expr) because there is no way in
4379 which the host association can be wrong. */
4380 if (e->symtree == NULL
4381 || e->symtree->n.sym == NULL
4382 || e->user_operator)
4385 old_sym = e->symtree->n.sym;
4387 if (gfc_current_ns->parent
4388 && old_sym->ns != gfc_current_ns)
4390 /* Use the 'USE' name so that renamed module symbols are
4391 correctly handled. */
4392 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4394 if (sym && old_sym != sym
4395 && sym->ts.type == old_sym->ts.type
4396 && sym->attr.flavor == FL_PROCEDURE
4397 && sym->attr.contained)
4399 /* Clear the shape, since it might not be valid. */
4400 if (e->shape != NULL)
4402 for (n = 0; n < e->rank; n++)
4403 mpz_clear (e->shape[n]);
4405 gfc_free (e->shape);
4408 /* Give the expression the right symtree! */
4409 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4410 gcc_assert (st != NULL);
4412 if (old_sym->attr.flavor == FL_PROCEDURE
4413 || e->expr_type == EXPR_FUNCTION)
4415 /* Original was function so point to the new symbol, since
4416 the actual argument list is already attached to the
4418 e->value.function.esym = NULL;
4423 /* Original was variable so convert array references into
4424 an actual arglist. This does not need any checking now
4425 since gfc_resolve_function will take care of it. */
4426 e->value.function.actual = NULL;
4427 e->expr_type = EXPR_FUNCTION;
4430 /* Ambiguity will not arise if the array reference is not
4431 the last reference. */
4432 for (ref = e->ref; ref; ref = ref->next)
4433 if (ref->type == REF_ARRAY && ref->next == NULL)
4436 gcc_assert (ref->type == REF_ARRAY);
4438 /* Grab the start expressions from the array ref and
4439 copy them into actual arguments. */
4440 for (n = 0; n < ref->u.ar.dimen; n++)
4442 arg = gfc_get_actual_arglist ();
4443 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4444 if (e->value.function.actual == NULL)
4445 tail = e->value.function.actual = arg;
4453 /* Dump the reference list and set the rank. */
4454 gfc_free_ref_list (e->ref);
4456 e->rank = sym->as ? sym->as->rank : 0;
4459 gfc_resolve_expr (e);
4463 /* This might have changed! */
4464 return e->expr_type == EXPR_FUNCTION;
4469 gfc_resolve_character_operator (gfc_expr *e)
4471 gfc_expr *op1 = e->value.op.op1;
4472 gfc_expr *op2 = e->value.op.op2;
4473 gfc_expr *e1 = NULL;
4474 gfc_expr *e2 = NULL;
4476 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4478 if (op1->ts.cl && op1->ts.cl->length)
4479 e1 = gfc_copy_expr (op1->ts.cl->length);
4480 else if (op1->expr_type == EXPR_CONSTANT)
4481 e1 = gfc_int_expr (op1->value.character.length);
4483 if (op2->ts.cl && op2->ts.cl->length)
4484 e2 = gfc_copy_expr (op2->ts.cl->length);
4485 else if (op2->expr_type == EXPR_CONSTANT)
4486 e2 = gfc_int_expr (op2->value.character.length);
4488 e->ts.cl = gfc_new_charlen (gfc_current_ns);
4493 e->ts.cl->length = gfc_add (e1, e2);
4494 e->ts.cl->length->ts.type = BT_INTEGER;
4495 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;
4496 gfc_simplify_expr (e->ts.cl->length, 0);
4497 gfc_resolve_expr (e->ts.cl->length);
4503 /* Ensure that an character expression has a charlen and, if possible, a
4504 length expression. */
4507 fixup_charlen (gfc_expr *e)
4509 /* The cases fall through so that changes in expression type and the need
4510 for multiple fixes are picked up. In all circumstances, a charlen should
4511 be available for the middle end to hang a backend_decl on. */
4512 switch (e->expr_type)
4515 gfc_resolve_character_operator (e);
4518 if (e->expr_type == EXPR_ARRAY)
4519 gfc_resolve_character_array_constructor (e);
4521 case EXPR_SUBSTRING:
4522 if (!e->ts.cl && e->ref)
4523 gfc_resolve_substring_charlen (e);
4527 e->ts.cl = gfc_new_charlen (gfc_current_ns);
4534 /* Update an actual argument to include the passed-object for type-bound
4535 procedures at the right position. */
4537 static gfc_actual_arglist*
4538 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
4541 gcc_assert (argpos > 0);
4545 gfc_actual_arglist* result;
4547 result = gfc_get_actual_arglist ();
4551 result->name = name;
4557 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
4559 lst = update_arglist_pass (NULL, po, argpos - 1, name);
4564 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4567 extract_compcall_passed_object (gfc_expr* e)
4571 gcc_assert (e->expr_type == EXPR_COMPCALL);
4573 po = gfc_get_expr ();
4574 po->expr_type = EXPR_VARIABLE;
4575 po->symtree = e->symtree;
4576 po->ref = gfc_copy_ref (e->ref);
4578 if (gfc_resolve_expr (po) == FAILURE)
4585 /* Update the arglist of an EXPR_COMPCALL expression to include the
4589 update_compcall_arglist (gfc_expr* e)
4592 gfc_typebound_proc* tbp;
4594 tbp = e->value.compcall.tbp;
4599 po = extract_compcall_passed_object (e);
4605 gfc_error ("Passed-object at %L must be scalar", &e->where);
4615 gcc_assert (tbp->pass_arg_num > 0);
4616 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4624 /* Extract the passed object from a PPC call (a copy of it). */
4627 extract_ppc_passed_object (gfc_expr *e)
4632 po = gfc_get_expr ();
4633 po->expr_type = EXPR_VARIABLE;
4634 po->symtree = e->symtree;
4635 po->ref = gfc_copy_ref (e->ref);
4637 /* Remove PPC reference. */
4639 while ((*ref)->next)
4640 (*ref) = (*ref)->next;
4641 gfc_free_ref_list (*ref);
4644 if (gfc_resolve_expr (po) == FAILURE)
4651 /* Update the actual arglist of a procedure pointer component to include the
4655 update_ppc_arglist (gfc_expr* e)
4659 gfc_typebound_proc* tb;
4661 if (!gfc_is_proc_ptr_comp (e, &ppc))
4668 else if (tb->nopass)
4671 po = extract_ppc_passed_object (e);
4677 gfc_error ("Passed-object at %L must be scalar", &e->where);
4681 gcc_assert (tb->pass_arg_num > 0);
4682 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4690 /* Check that the object a TBP is called on is valid, i.e. it must not be
4691 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
4694 check_typebound_baseobject (gfc_expr* e)
4698 base = extract_compcall_passed_object (e);
4702 gcc_assert (base->ts.type == BT_DERIVED);
4703 if (base->ts.derived->attr.abstract)
4705 gfc_error ("Base object for type-bound procedure call at %L is of"
4706 " ABSTRACT type '%s'", &e->where, base->ts.derived->name);
4714 /* Resolve a call to a type-bound procedure, either function or subroutine,
4715 statically from the data in an EXPR_COMPCALL expression. The adapted
4716 arglist and the target-procedure symtree are returned. */
4719 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
4720 gfc_actual_arglist** actual)
4722 gcc_assert (e->expr_type == EXPR_COMPCALL);
4723 gcc_assert (!e->value.compcall.tbp->is_generic);
4725 /* Update the actual arglist for PASS. */
4726 if (update_compcall_arglist (e) == FAILURE)
4729 *actual = e->value.compcall.actual;
4730 *target = e->value.compcall.tbp->u.specific;
4732 gfc_free_ref_list (e->ref);
4734 e->value.compcall.actual = NULL;
4740 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
4741 which of the specific bindings (if any) matches the arglist and transform
4742 the expression into a call of that binding. */
4745 resolve_typebound_generic_call (gfc_expr* e)
4747 gfc_typebound_proc* genproc;
4748 const char* genname;
4750 gcc_assert (e->expr_type == EXPR_COMPCALL);
4751 genname = e->value.compcall.name;
4752 genproc = e->value.compcall.tbp;
4754 if (!genproc->is_generic)
4757 /* Try the bindings on this type and in the inheritance hierarchy. */
4758 for (; genproc; genproc = genproc->overridden)
4762 gcc_assert (genproc->is_generic);
4763 for (g = genproc->u.generic; g; g = g->next)
4766 gfc_actual_arglist* args;
4769 gcc_assert (g->specific);
4771 if (g->specific->error)
4774 target = g->specific->u.specific->n.sym;
4776 /* Get the right arglist by handling PASS/NOPASS. */
4777 args = gfc_copy_actual_arglist (e->value.compcall.actual);
4778 if (!g->specific->nopass)
4781 po = extract_compcall_passed_object (e);
4785 gcc_assert (g->specific->pass_arg_num > 0);
4786 gcc_assert (!g->specific->error);
4787 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
4788 g->specific->pass_arg);
4790 resolve_actual_arglist (args, target->attr.proc,
4791 is_external_proc (target) && !target->formal);
4793 /* Check if this arglist matches the formal. */
4794 matches = gfc_arglist_matches_symbol (&args, target);
4796 /* Clean up and break out of the loop if we've found it. */
4797 gfc_free_actual_arglist (args);
4800 e->value.compcall.tbp = g->specific;
4806 /* Nothing matching found! */
4807 gfc_error ("Found no matching specific binding for the call to the GENERIC"
4808 " '%s' at %L", genname, &e->where);
4816 /* Resolve a call to a type-bound subroutine. */
4819 resolve_typebound_call (gfc_code* c)
4821 gfc_actual_arglist* newactual;
4822 gfc_symtree* target;
4824 /* Check that's really a SUBROUTINE. */
4825 if (!c->expr1->value.compcall.tbp->subroutine)
4827 gfc_error ("'%s' at %L should be a SUBROUTINE",
4828 c->expr1->value.compcall.name, &c->loc);
4832 if (check_typebound_baseobject (c->expr1) == FAILURE)
4835 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
4838 /* Transform into an ordinary EXEC_CALL for now. */
4840 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
4843 c->ext.actual = newactual;
4844 c->symtree = target;
4847 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
4848 gfc_free_expr (c->expr1);
4851 return resolve_call (c);
4855 /* Resolve a component-call expression. */
4858 resolve_compcall (gfc_expr* e)
4860 gfc_actual_arglist* newactual;
4861 gfc_symtree* target;
4863 /* Check that's really a FUNCTION. */
4864 if (!e->value.compcall.tbp->function)
4866 gfc_error ("'%s' at %L should be a FUNCTION",
4867 e->value.compcall.name, &e->where);
4871 if (check_typebound_baseobject (e) == FAILURE)
4874 if (resolve_typebound_generic_call (e) == FAILURE)
4876 gcc_assert (!e->value.compcall.tbp->is_generic);
4878 /* Take the rank from the function's symbol. */
4879 if (e->value.compcall.tbp->u.specific->n.sym->as)
4880 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
4882 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
4883 arglist to the TBP's binding target. */
4885 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
4888 e->value.function.actual = newactual;
4889 e->value.function.name = e->value.compcall.name;
4890 e->value.function.esym = target->n.sym;
4891 e->value.function.isym = NULL;
4892 e->symtree = target;
4893 e->ts = target->n.sym->ts;
4894 e->expr_type = EXPR_FUNCTION;
4896 return gfc_resolve_expr (e);
4900 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
4903 resolve_ppc_call (gfc_code* c)
4905 gfc_component *comp;
4906 gcc_assert (gfc_is_proc_ptr_comp (c->expr1, &comp));
4908 c->resolved_sym = c->expr1->symtree->n.sym;
4909 c->expr1->expr_type = EXPR_VARIABLE;
4911 if (!comp->attr.subroutine)
4912 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
4914 if (resolve_ref (c->expr1) == FAILURE)
4917 if (update_ppc_arglist (c->expr1) == FAILURE)
4920 c->ext.actual = c->expr1->value.compcall.actual;
4922 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
4923 comp->formal == NULL) == FAILURE)
4926 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
4932 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
4935 resolve_expr_ppc (gfc_expr* e)
4937 gfc_component *comp;
4938 gcc_assert (gfc_is_proc_ptr_comp (e, &comp));
4940 /* Convert to EXPR_FUNCTION. */
4941 e->expr_type = EXPR_FUNCTION;
4942 e->value.function.isym = NULL;
4943 e->value.function.actual = e->value.compcall.actual;
4945 if (comp->as != NULL)
4946 e->rank = comp->as->rank;
4948 if (!comp->attr.function)
4949 gfc_add_function (&comp->attr, comp->name, &e->where);
4951 if (resolve_ref (e) == FAILURE)
4954 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
4955 comp->formal == NULL) == FAILURE)
4958 if (update_ppc_arglist (e) == FAILURE)
4961 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
4967 /* Resolve an expression. That is, make sure that types of operands agree
4968 with their operators, intrinsic operators are converted to function calls
4969 for overloaded types and unresolved function references are resolved. */
4972 gfc_resolve_expr (gfc_expr *e)
4979 switch (e->expr_type)
4982 t = resolve_operator (e);
4988 if (check_host_association (e))
4989 t = resolve_function (e);
4992 t = resolve_variable (e);
4994 expression_rank (e);
4997 if (e->ts.type == BT_CHARACTER && e->ts.cl == NULL && e->ref
4998 && e->ref->type != REF_SUBSTRING)
4999 gfc_resolve_substring_charlen (e);
5004 t = resolve_compcall (e);
5007 case EXPR_SUBSTRING:
5008 t = resolve_ref (e);
5017 t = resolve_expr_ppc (e);
5022 if (resolve_ref (e) == FAILURE)
5025 t = gfc_resolve_array_constructor (e);
5026 /* Also try to expand a constructor. */
5029 expression_rank (e);
5030 gfc_expand_constructor (e);
5033 /* This provides the opportunity for the length of constructors with
5034 character valued function elements to propagate the string length
5035 to the expression. */
5036 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5037 t = gfc_resolve_character_array_constructor (e);
5041 case EXPR_STRUCTURE:
5042 t = resolve_ref (e);
5046 t = resolve_structure_cons (e);
5050 t = gfc_simplify_expr (e, 0);
5054 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5057 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.cl)
5064 /* Resolve an expression from an iterator. They must be scalar and have
5065 INTEGER or (optionally) REAL type. */
5068 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5069 const char *name_msgid)
5071 if (gfc_resolve_expr (expr) == FAILURE)
5074 if (expr->rank != 0)
5076 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5080 if (expr->ts.type != BT_INTEGER)
5082 if (expr->ts.type == BT_REAL)
5085 return gfc_notify_std (GFC_STD_F95_DEL,
5086 "Deleted feature: %s at %L must be integer",
5087 _(name_msgid), &expr->where);
5090 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5097 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5105 /* Resolve the expressions in an iterator structure. If REAL_OK is
5106 false allow only INTEGER type iterators, otherwise allow REAL types. */
5109 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5111 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5115 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5117 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5122 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5123 "Start expression in DO loop") == FAILURE)
5126 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5127 "End expression in DO loop") == FAILURE)
5130 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5131 "Step expression in DO loop") == FAILURE)
5134 if (iter->step->expr_type == EXPR_CONSTANT)
5136 if ((iter->step->ts.type == BT_INTEGER
5137 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5138 || (iter->step->ts.type == BT_REAL
5139 && mpfr_sgn (iter->step->value.real) == 0))
5141 gfc_error ("Step expression in DO loop at %L cannot be zero",
5142 &iter->step->where);
5147 /* Convert start, end, and step to the same type as var. */
5148 if (iter->start->ts.kind != iter->var->ts.kind
5149 || iter->start->ts.type != iter->var->ts.type)
5150 gfc_convert_type (iter->start, &iter->var->ts, 2);
5152 if (iter->end->ts.kind != iter->var->ts.kind
5153 || iter->end->ts.type != iter->var->ts.type)
5154 gfc_convert_type (iter->end, &iter->var->ts, 2);
5156 if (iter->step->ts.kind != iter->var->ts.kind
5157 || iter->step->ts.type != iter->var->ts.type)
5158 gfc_convert_type (iter->step, &iter->var->ts, 2);
5160 if (iter->start->expr_type == EXPR_CONSTANT
5161 && iter->end->expr_type == EXPR_CONSTANT
5162 && iter->step->expr_type == EXPR_CONSTANT)
5165 if (iter->start->ts.type == BT_INTEGER)
5167 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5168 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5172 sgn = mpfr_sgn (iter->step->value.real);
5173 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5175 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5176 gfc_warning ("DO loop at %L will be executed zero times",
5177 &iter->step->where);
5184 /* Traversal function for find_forall_index. f == 2 signals that
5185 that variable itself is not to be checked - only the references. */
5188 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5190 if (expr->expr_type != EXPR_VARIABLE)
5193 /* A scalar assignment */
5194 if (!expr->ref || *f == 1)
5196 if (expr->symtree->n.sym == sym)
5208 /* Check whether the FORALL index appears in the expression or not.
5209 Returns SUCCESS if SYM is found in EXPR. */
5212 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5214 if (gfc_traverse_expr (expr, sym, forall_index, f))
5221 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5222 to be a scalar INTEGER variable. The subscripts and stride are scalar
5223 INTEGERs, and if stride is a constant it must be nonzero.
5224 Furthermore "A subscript or stride in a forall-triplet-spec shall
5225 not contain a reference to any index-name in the
5226 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5229 resolve_forall_iterators (gfc_forall_iterator *it)
5231 gfc_forall_iterator *iter, *iter2;
5233 for (iter = it; iter; iter = iter->next)
5235 if (gfc_resolve_expr (iter->var) == SUCCESS
5236 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5237 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5240 if (gfc_resolve_expr (iter->start) == SUCCESS
5241 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5242 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5243 &iter->start->where);
5244 if (iter->var->ts.kind != iter->start->ts.kind)
5245 gfc_convert_type (iter->start, &iter->var->ts, 2);
5247 if (gfc_resolve_expr (iter->end) == SUCCESS
5248 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5249 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5251 if (iter->var->ts.kind != iter->end->ts.kind)
5252 gfc_convert_type (iter->end, &iter->var->ts, 2);
5254 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5256 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5257 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5258 &iter->stride->where, "INTEGER");
5260 if (iter->stride->expr_type == EXPR_CONSTANT
5261 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5262 gfc_error ("FORALL stride expression at %L cannot be zero",
5263 &iter->stride->where);
5265 if (iter->var->ts.kind != iter->stride->ts.kind)
5266 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5269 for (iter = it; iter; iter = iter->next)
5270 for (iter2 = iter; iter2; iter2 = iter2->next)
5272 if (find_forall_index (iter2->start,
5273 iter->var->symtree->n.sym, 0) == SUCCESS
5274 || find_forall_index (iter2->end,
5275 iter->var->symtree->n.sym, 0) == SUCCESS
5276 || find_forall_index (iter2->stride,
5277 iter->var->symtree->n.sym, 0) == SUCCESS)
5278 gfc_error ("FORALL index '%s' may not appear in triplet "
5279 "specification at %L", iter->var->symtree->name,
5280 &iter2->start->where);
5285 /* Given a pointer to a symbol that is a derived type, see if it's
5286 inaccessible, i.e. if it's defined in another module and the components are
5287 PRIVATE. The search is recursive if necessary. Returns zero if no
5288 inaccessible components are found, nonzero otherwise. */
5291 derived_inaccessible (gfc_symbol *sym)
5295 if (sym->attr.use_assoc && sym->attr.private_comp)
5298 for (c = sym->components; c; c = c->next)
5300 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.derived))
5308 /* Resolve the argument of a deallocate expression. The expression must be
5309 a pointer or a full array. */
5312 resolve_deallocate_expr (gfc_expr *e)
5314 symbol_attribute attr;
5315 int allocatable, pointer, check_intent_in;
5318 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5319 check_intent_in = 1;
5321 if (gfc_resolve_expr (e) == FAILURE)
5324 if (e->expr_type != EXPR_VARIABLE)
5327 allocatable = e->symtree->n.sym->attr.allocatable;
5328 pointer = e->symtree->n.sym->attr.pointer;
5329 for (ref = e->ref; ref; ref = ref->next)
5332 check_intent_in = 0;
5337 if (ref->u.ar.type != AR_FULL)
5342 allocatable = (ref->u.c.component->as != NULL
5343 && ref->u.c.component->as->type == AS_DEFERRED);
5344 pointer = ref->u.c.component->attr.pointer;
5353 attr = gfc_expr_attr (e);
5355 if (allocatable == 0 && attr.pointer == 0)
5358 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5363 && e->symtree->n.sym->attr.intent == INTENT_IN)
5365 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5366 e->symtree->n.sym->name, &e->where);
5374 /* Returns true if the expression e contains a reference to the symbol sym. */
5376 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5378 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
5385 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
5387 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
5391 /* Given the expression node e for an allocatable/pointer of derived type to be
5392 allocated, get the expression node to be initialized afterwards (needed for
5393 derived types with default initializers, and derived types with allocatable
5394 components that need nullification.) */
5397 expr_to_initialize (gfc_expr *e)
5403 result = gfc_copy_expr (e);
5405 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
5406 for (ref = result->ref; ref; ref = ref->next)
5407 if (ref->type == REF_ARRAY && ref->next == NULL)
5409 ref->u.ar.type = AR_FULL;
5411 for (i = 0; i < ref->u.ar.dimen; i++)
5412 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
5414 result->rank = ref->u.ar.dimen;
5422 /* Resolve the expression in an ALLOCATE statement, doing the additional
5423 checks to see whether the expression is OK or not. The expression must
5424 have a trailing array reference that gives the size of the array. */
5427 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
5429 int i, pointer, allocatable, dimension, check_intent_in;
5430 symbol_attribute attr;
5431 gfc_ref *ref, *ref2;
5438 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5439 check_intent_in = 1;
5441 if (gfc_resolve_expr (e) == FAILURE)
5444 /* Make sure the expression is allocatable or a pointer. If it is
5445 pointer, the next-to-last reference must be a pointer. */
5449 if (e->expr_type != EXPR_VARIABLE)
5452 attr = gfc_expr_attr (e);
5453 pointer = attr.pointer;
5454 dimension = attr.dimension;
5458 allocatable = e->symtree->n.sym->attr.allocatable;
5459 pointer = e->symtree->n.sym->attr.pointer;
5460 dimension = e->symtree->n.sym->attr.dimension;
5462 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
5465 check_intent_in = 0;
5470 if (ref->next != NULL)
5475 allocatable = (ref->u.c.component->as != NULL
5476 && ref->u.c.component->as->type == AS_DEFERRED);
5478 pointer = ref->u.c.component->attr.pointer;
5479 dimension = ref->u.c.component->attr.dimension;
5490 if (allocatable == 0 && pointer == 0)
5492 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5498 && e->symtree->n.sym->attr.intent == INTENT_IN)
5500 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
5501 e->symtree->n.sym->name, &e->where);
5505 /* Add default initializer for those derived types that need them. */
5506 if (e->ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&e->ts)))
5508 init_st = gfc_get_code ();
5509 init_st->loc = code->loc;
5510 init_st->op = EXEC_INIT_ASSIGN;
5511 init_st->expr1 = expr_to_initialize (e);
5512 init_st->expr2 = init_e;
5513 init_st->next = code->next;
5514 code->next = init_st;
5517 if (pointer && dimension == 0)
5520 /* Make sure the next-to-last reference node is an array specification. */
5522 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
5524 gfc_error ("Array specification required in ALLOCATE statement "
5525 "at %L", &e->where);
5529 /* Make sure that the array section reference makes sense in the
5530 context of an ALLOCATE specification. */
5534 for (i = 0; i < ar->dimen; i++)
5536 if (ref2->u.ar.type == AR_ELEMENT)
5539 switch (ar->dimen_type[i])
5545 if (ar->start[i] != NULL
5546 && ar->end[i] != NULL
5547 && ar->stride[i] == NULL)
5550 /* Fall Through... */
5554 gfc_error ("Bad array specification in ALLOCATE statement at %L",
5561 for (a = code->ext.alloc_list; a; a = a->next)
5563 sym = a->expr->symtree->n.sym;
5565 /* TODO - check derived type components. */
5566 if (sym->ts.type == BT_DERIVED)
5569 if ((ar->start[i] != NULL
5570 && gfc_find_sym_in_expr (sym, ar->start[i]))
5571 || (ar->end[i] != NULL
5572 && gfc_find_sym_in_expr (sym, ar->end[i])))
5574 gfc_error ("'%s' must not appear in the array specification at "
5575 "%L in the same ALLOCATE statement where it is "
5576 "itself allocated", sym->name, &ar->where);
5586 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
5588 gfc_expr *stat, *errmsg, *pe, *qe;
5589 gfc_alloc *a, *p, *q;
5591 stat = code->expr1 ? code->expr1 : NULL;
5593 errmsg = code->expr2 ? code->expr2 : NULL;
5595 /* Check the stat variable. */
5598 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
5599 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
5600 stat->symtree->n.sym->name, &stat->where);
5602 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
5603 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
5606 if (stat->ts.type != BT_INTEGER
5607 && !(stat->ref && (stat->ref->type == REF_ARRAY
5608 || stat->ref->type == REF_COMPONENT)))
5609 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
5610 "variable", &stat->where);
5612 for (p = code->ext.alloc_list; p; p = p->next)
5613 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
5614 gfc_error ("Stat-variable at %L shall not be %sd within "
5615 "the same %s statement", &stat->where, fcn, fcn);
5618 /* Check the errmsg variable. */
5622 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
5625 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
5626 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
5627 errmsg->symtree->n.sym->name, &errmsg->where);
5629 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
5630 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
5633 if (errmsg->ts.type != BT_CHARACTER
5635 && (errmsg->ref->type == REF_ARRAY
5636 || errmsg->ref->type == REF_COMPONENT)))
5637 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
5638 "variable", &errmsg->where);
5640 for (p = code->ext.alloc_list; p; p = p->next)
5641 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
5642 gfc_error ("Errmsg-variable at %L shall not be %sd within "
5643 "the same %s statement", &errmsg->where, fcn, fcn);
5646 /* Check that an allocate-object appears only once in the statement.
5647 FIXME: Checking derived types is disabled. */
5648 for (p = code->ext.alloc_list; p; p = p->next)
5651 if ((pe->ref && pe->ref->type != REF_COMPONENT)
5652 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
5654 for (q = p->next; q; q = q->next)
5657 if ((qe->ref && qe->ref->type != REF_COMPONENT)
5658 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
5659 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
5660 gfc_error ("Allocate-object at %L also appears at %L",
5661 &pe->where, &qe->where);
5666 if (strcmp (fcn, "ALLOCATE") == 0)
5668 for (a = code->ext.alloc_list; a; a = a->next)
5669 resolve_allocate_expr (a->expr, code);
5673 for (a = code->ext.alloc_list; a; a = a->next)
5674 resolve_deallocate_expr (a->expr);
5679 /************ SELECT CASE resolution subroutines ************/
5681 /* Callback function for our mergesort variant. Determines interval
5682 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
5683 op1 > op2. Assumes we're not dealing with the default case.
5684 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
5685 There are nine situations to check. */
5688 compare_cases (const gfc_case *op1, const gfc_case *op2)
5692 if (op1->low == NULL) /* op1 = (:L) */
5694 /* op2 = (:N), so overlap. */
5696 /* op2 = (M:) or (M:N), L < M */
5697 if (op2->low != NULL
5698 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5701 else if (op1->high == NULL) /* op1 = (K:) */
5703 /* op2 = (M:), so overlap. */
5705 /* op2 = (:N) or (M:N), K > N */
5706 if (op2->high != NULL
5707 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5710 else /* op1 = (K:L) */
5712 if (op2->low == NULL) /* op2 = (:N), K > N */
5713 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5715 else if (op2->high == NULL) /* op2 = (M:), L < M */
5716 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5718 else /* op2 = (M:N) */
5722 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5725 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5734 /* Merge-sort a double linked case list, detecting overlap in the
5735 process. LIST is the head of the double linked case list before it
5736 is sorted. Returns the head of the sorted list if we don't see any
5737 overlap, or NULL otherwise. */
5740 check_case_overlap (gfc_case *list)
5742 gfc_case *p, *q, *e, *tail;
5743 int insize, nmerges, psize, qsize, cmp, overlap_seen;
5745 /* If the passed list was empty, return immediately. */
5752 /* Loop unconditionally. The only exit from this loop is a return
5753 statement, when we've finished sorting the case list. */
5760 /* Count the number of merges we do in this pass. */
5763 /* Loop while there exists a merge to be done. */
5768 /* Count this merge. */
5771 /* Cut the list in two pieces by stepping INSIZE places
5772 forward in the list, starting from P. */
5775 for (i = 0; i < insize; i++)
5784 /* Now we have two lists. Merge them! */
5785 while (psize > 0 || (qsize > 0 && q != NULL))
5787 /* See from which the next case to merge comes from. */
5790 /* P is empty so the next case must come from Q. */
5795 else if (qsize == 0 || q == NULL)
5804 cmp = compare_cases (p, q);
5807 /* The whole case range for P is less than the
5815 /* The whole case range for Q is greater than
5816 the case range for P. */
5823 /* The cases overlap, or they are the same
5824 element in the list. Either way, we must
5825 issue an error and get the next case from P. */
5826 /* FIXME: Sort P and Q by line number. */
5827 gfc_error ("CASE label at %L overlaps with CASE "
5828 "label at %L", &p->where, &q->where);
5836 /* Add the next element to the merged list. */
5845 /* P has now stepped INSIZE places along, and so has Q. So
5846 they're the same. */
5851 /* If we have done only one merge or none at all, we've
5852 finished sorting the cases. */
5861 /* Otherwise repeat, merging lists twice the size. */
5867 /* Check to see if an expression is suitable for use in a CASE statement.
5868 Makes sure that all case expressions are scalar constants of the same
5869 type. Return FAILURE if anything is wrong. */
5872 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
5874 if (e == NULL) return SUCCESS;
5876 if (e->ts.type != case_expr->ts.type)
5878 gfc_error ("Expression in CASE statement at %L must be of type %s",
5879 &e->where, gfc_basic_typename (case_expr->ts.type));
5883 /* C805 (R808) For a given case-construct, each case-value shall be of
5884 the same type as case-expr. For character type, length differences
5885 are allowed, but the kind type parameters shall be the same. */
5887 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
5889 gfc_error ("Expression in CASE statement at %L must be of kind %d",
5890 &e->where, case_expr->ts.kind);
5894 /* Convert the case value kind to that of case expression kind, if needed.
5895 FIXME: Should a warning be issued? */
5896 if (e->ts.kind != case_expr->ts.kind)
5897 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
5901 gfc_error ("Expression in CASE statement at %L must be scalar",
5910 /* Given a completely parsed select statement, we:
5912 - Validate all expressions and code within the SELECT.
5913 - Make sure that the selection expression is not of the wrong type.
5914 - Make sure that no case ranges overlap.
5915 - Eliminate unreachable cases and unreachable code resulting from
5916 removing case labels.
5918 The standard does allow unreachable cases, e.g. CASE (5:3). But
5919 they are a hassle for code generation, and to prevent that, we just
5920 cut them out here. This is not necessary for overlapping cases
5921 because they are illegal and we never even try to generate code.
5923 We have the additional caveat that a SELECT construct could have
5924 been a computed GOTO in the source code. Fortunately we can fairly
5925 easily work around that here: The case_expr for a "real" SELECT CASE
5926 is in code->expr1, but for a computed GOTO it is in code->expr2. All
5927 we have to do is make sure that the case_expr is a scalar integer
5931 resolve_select (gfc_code *code)
5934 gfc_expr *case_expr;
5935 gfc_case *cp, *default_case, *tail, *head;
5936 int seen_unreachable;
5942 if (code->expr1 == NULL)
5944 /* This was actually a computed GOTO statement. */
5945 case_expr = code->expr2;
5946 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
5947 gfc_error ("Selection expression in computed GOTO statement "
5948 "at %L must be a scalar integer expression",
5951 /* Further checking is not necessary because this SELECT was built
5952 by the compiler, so it should always be OK. Just move the
5953 case_expr from expr2 to expr so that we can handle computed
5954 GOTOs as normal SELECTs from here on. */
5955 code->expr1 = code->expr2;
5960 case_expr = code->expr1;
5962 type = case_expr->ts.type;
5963 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
5965 gfc_error ("Argument of SELECT statement at %L cannot be %s",
5966 &case_expr->where, gfc_typename (&case_expr->ts));
5968 /* Punt. Going on here just produce more garbage error messages. */
5972 if (case_expr->rank != 0)
5974 gfc_error ("Argument of SELECT statement at %L must be a scalar "
5975 "expression", &case_expr->where);
5981 /* PR 19168 has a long discussion concerning a mismatch of the kinds
5982 of the SELECT CASE expression and its CASE values. Walk the lists
5983 of case values, and if we find a mismatch, promote case_expr to
5984 the appropriate kind. */
5986 if (type == BT_LOGICAL || type == BT_INTEGER)
5988 for (body = code->block; body; body = body->block)
5990 /* Walk the case label list. */
5991 for (cp = body->ext.case_list; cp; cp = cp->next)
5993 /* Intercept the DEFAULT case. It does not have a kind. */
5994 if (cp->low == NULL && cp->high == NULL)
5997 /* Unreachable case ranges are discarded, so ignore. */
5998 if (cp->low != NULL && cp->high != NULL
5999 && cp->low != cp->high
6000 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6003 /* FIXME: Should a warning be issued? */
6005 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6006 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6008 if (cp->high != NULL
6009 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6010 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6015 /* Assume there is no DEFAULT case. */
6016 default_case = NULL;
6021 for (body = code->block; body; body = body->block)
6023 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6025 seen_unreachable = 0;
6027 /* Walk the case label list, making sure that all case labels
6029 for (cp = body->ext.case_list; cp; cp = cp->next)
6031 /* Count the number of cases in the whole construct. */
6034 /* Intercept the DEFAULT case. */
6035 if (cp->low == NULL && cp->high == NULL)
6037 if (default_case != NULL)
6039 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6040 "by a second DEFAULT CASE at %L",
6041 &default_case->where, &cp->where);
6052 /* Deal with single value cases and case ranges. Errors are
6053 issued from the validation function. */
6054 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
6055 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
6061 if (type == BT_LOGICAL
6062 && ((cp->low == NULL || cp->high == NULL)
6063 || cp->low != cp->high))
6065 gfc_error ("Logical range in CASE statement at %L is not "
6066 "allowed", &cp->low->where);
6071 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
6074 value = cp->low->value.logical == 0 ? 2 : 1;
6075 if (value & seen_logical)
6077 gfc_error ("constant logical value in CASE statement "
6078 "is repeated at %L",
6083 seen_logical |= value;
6086 if (cp->low != NULL && cp->high != NULL
6087 && cp->low != cp->high
6088 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6090 if (gfc_option.warn_surprising)
6091 gfc_warning ("Range specification at %L can never "
6092 "be matched", &cp->where);
6094 cp->unreachable = 1;
6095 seen_unreachable = 1;
6099 /* If the case range can be matched, it can also overlap with
6100 other cases. To make sure it does not, we put it in a
6101 double linked list here. We sort that with a merge sort
6102 later on to detect any overlapping cases. */
6106 head->right = head->left = NULL;
6111 tail->right->left = tail;
6118 /* It there was a failure in the previous case label, give up
6119 for this case label list. Continue with the next block. */
6123 /* See if any case labels that are unreachable have been seen.
6124 If so, we eliminate them. This is a bit of a kludge because
6125 the case lists for a single case statement (label) is a
6126 single forward linked lists. */
6127 if (seen_unreachable)
6129 /* Advance until the first case in the list is reachable. */
6130 while (body->ext.case_list != NULL
6131 && body->ext.case_list->unreachable)
6133 gfc_case *n = body->ext.case_list;
6134 body->ext.case_list = body->ext.case_list->next;
6136 gfc_free_case_list (n);
6139 /* Strip all other unreachable cases. */
6140 if (body->ext.case_list)
6142 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6144 if (cp->next->unreachable)
6146 gfc_case *n = cp->next;
6147 cp->next = cp->next->next;
6149 gfc_free_case_list (n);
6156 /* See if there were overlapping cases. If the check returns NULL,
6157 there was overlap. In that case we don't do anything. If head
6158 is non-NULL, we prepend the DEFAULT case. The sorted list can
6159 then used during code generation for SELECT CASE constructs with
6160 a case expression of a CHARACTER type. */
6163 head = check_case_overlap (head);
6165 /* Prepend the default_case if it is there. */
6166 if (head != NULL && default_case)
6168 default_case->left = NULL;
6169 default_case->right = head;
6170 head->left = default_case;
6174 /* Eliminate dead blocks that may be the result if we've seen
6175 unreachable case labels for a block. */
6176 for (body = code; body && body->block; body = body->block)
6178 if (body->block->ext.case_list == NULL)
6180 /* Cut the unreachable block from the code chain. */
6181 gfc_code *c = body->block;
6182 body->block = c->block;
6184 /* Kill the dead block, but not the blocks below it. */
6186 gfc_free_statements (c);
6190 /* More than two cases is legal but insane for logical selects.
6191 Issue a warning for it. */
6192 if (gfc_option.warn_surprising && type == BT_LOGICAL
6194 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6199 /* Resolve a transfer statement. This is making sure that:
6200 -- a derived type being transferred has only non-pointer components
6201 -- a derived type being transferred doesn't have private components, unless
6202 it's being transferred from the module where the type was defined
6203 -- we're not trying to transfer a whole assumed size array. */
6206 resolve_transfer (gfc_code *code)
6215 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
6218 sym = exp->symtree->n.sym;
6221 /* Go to actual component transferred. */
6222 for (ref = code->expr1->ref; ref; ref = ref->next)
6223 if (ref->type == REF_COMPONENT)
6224 ts = &ref->u.c.component->ts;
6226 if (ts->type == BT_DERIVED)
6228 /* Check that transferred derived type doesn't contain POINTER
6230 if (ts->derived->attr.pointer_comp)
6232 gfc_error ("Data transfer element at %L cannot have "
6233 "POINTER components", &code->loc);
6237 if (ts->derived->attr.alloc_comp)
6239 gfc_error ("Data transfer element at %L cannot have "
6240 "ALLOCATABLE components", &code->loc);
6244 if (derived_inaccessible (ts->derived))
6246 gfc_error ("Data transfer element at %L cannot have "
6247 "PRIVATE components",&code->loc);
6252 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
6253 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
6255 gfc_error ("Data transfer element at %L cannot be a full reference to "
6256 "an assumed-size array", &code->loc);
6262 /*********** Toplevel code resolution subroutines ***********/
6264 /* Find the set of labels that are reachable from this block. We also
6265 record the last statement in each block. */
6268 find_reachable_labels (gfc_code *block)
6275 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
6277 /* Collect labels in this block. We don't keep those corresponding
6278 to END {IF|SELECT}, these are checked in resolve_branch by going
6279 up through the code_stack. */
6280 for (c = block; c; c = c->next)
6282 if (c->here && c->op != EXEC_END_BLOCK)
6283 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
6286 /* Merge with labels from parent block. */
6289 gcc_assert (cs_base->prev->reachable_labels);
6290 bitmap_ior_into (cs_base->reachable_labels,
6291 cs_base->prev->reachable_labels);
6295 /* Given a branch to a label, see if the branch is conforming.
6296 The code node describes where the branch is located. */
6299 resolve_branch (gfc_st_label *label, gfc_code *code)
6306 /* Step one: is this a valid branching target? */
6308 if (label->defined == ST_LABEL_UNKNOWN)
6310 gfc_error ("Label %d referenced at %L is never defined", label->value,
6315 if (label->defined != ST_LABEL_TARGET)
6317 gfc_error ("Statement at %L is not a valid branch target statement "
6318 "for the branch statement at %L", &label->where, &code->loc);
6322 /* Step two: make sure this branch is not a branch to itself ;-) */
6324 if (code->here == label)
6326 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
6330 /* Step three: See if the label is in the same block as the
6331 branching statement. The hard work has been done by setting up
6332 the bitmap reachable_labels. */
6334 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
6337 /* Step four: If we haven't found the label in the bitmap, it may
6338 still be the label of the END of the enclosing block, in which
6339 case we find it by going up the code_stack. */
6341 for (stack = cs_base; stack; stack = stack->prev)
6342 if (stack->current->next && stack->current->next->here == label)
6347 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
6351 /* The label is not in an enclosing block, so illegal. This was
6352 allowed in Fortran 66, so we allow it as extension. No
6353 further checks are necessary in this case. */
6354 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
6355 "as the GOTO statement at %L", &label->where,
6361 /* Check whether EXPR1 has the same shape as EXPR2. */
6364 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
6366 mpz_t shape[GFC_MAX_DIMENSIONS];
6367 mpz_t shape2[GFC_MAX_DIMENSIONS];
6368 gfc_try result = FAILURE;
6371 /* Compare the rank. */
6372 if (expr1->rank != expr2->rank)
6375 /* Compare the size of each dimension. */
6376 for (i=0; i<expr1->rank; i++)
6378 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
6381 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
6384 if (mpz_cmp (shape[i], shape2[i]))
6388 /* When either of the two expression is an assumed size array, we
6389 ignore the comparison of dimension sizes. */
6394 for (i--; i >= 0; i--)
6396 mpz_clear (shape[i]);
6397 mpz_clear (shape2[i]);
6403 /* Check whether a WHERE assignment target or a WHERE mask expression
6404 has the same shape as the outmost WHERE mask expression. */
6407 resolve_where (gfc_code *code, gfc_expr *mask)
6413 cblock = code->block;
6415 /* Store the first WHERE mask-expr of the WHERE statement or construct.
6416 In case of nested WHERE, only the outmost one is stored. */
6417 if (mask == NULL) /* outmost WHERE */
6419 else /* inner WHERE */
6426 /* Check if the mask-expr has a consistent shape with the
6427 outmost WHERE mask-expr. */
6428 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
6429 gfc_error ("WHERE mask at %L has inconsistent shape",
6430 &cblock->expr1->where);
6433 /* the assignment statement of a WHERE statement, or the first
6434 statement in where-body-construct of a WHERE construct */
6435 cnext = cblock->next;
6440 /* WHERE assignment statement */
6443 /* Check shape consistent for WHERE assignment target. */
6444 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
6445 gfc_error ("WHERE assignment target at %L has "
6446 "inconsistent shape", &cnext->expr1->where);
6450 case EXEC_ASSIGN_CALL:
6451 resolve_call (cnext);
6452 if (!cnext->resolved_sym->attr.elemental)
6453 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6454 &cnext->ext.actual->expr->where);
6457 /* WHERE or WHERE construct is part of a where-body-construct */
6459 resolve_where (cnext, e);
6463 gfc_error ("Unsupported statement inside WHERE at %L",
6466 /* the next statement within the same where-body-construct */
6467 cnext = cnext->next;
6469 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6470 cblock = cblock->block;
6475 /* Resolve assignment in FORALL construct.
6476 NVAR is the number of FORALL index variables, and VAR_EXPR records the
6477 FORALL index variables. */
6480 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
6484 for (n = 0; n < nvar; n++)
6486 gfc_symbol *forall_index;
6488 forall_index = var_expr[n]->symtree->n.sym;
6490 /* Check whether the assignment target is one of the FORALL index
6492 if ((code->expr1->expr_type == EXPR_VARIABLE)
6493 && (code->expr1->symtree->n.sym == forall_index))
6494 gfc_error ("Assignment to a FORALL index variable at %L",
6495 &code->expr1->where);
6498 /* If one of the FORALL index variables doesn't appear in the
6499 assignment variable, then there could be a many-to-one
6500 assignment. Emit a warning rather than an error because the
6501 mask could be resolving this problem. */
6502 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
6503 gfc_warning ("The FORALL with index '%s' is not used on the "
6504 "left side of the assignment at %L and so might "
6505 "cause multiple assignment to this object",
6506 var_expr[n]->symtree->name, &code->expr1->where);
6512 /* Resolve WHERE statement in FORALL construct. */
6515 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
6516 gfc_expr **var_expr)
6521 cblock = code->block;
6524 /* the assignment statement of a WHERE statement, or the first
6525 statement in where-body-construct of a WHERE construct */
6526 cnext = cblock->next;
6531 /* WHERE assignment statement */
6533 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
6536 /* WHERE operator assignment statement */
6537 case EXEC_ASSIGN_CALL:
6538 resolve_call (cnext);
6539 if (!cnext->resolved_sym->attr.elemental)
6540 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6541 &cnext->ext.actual->expr->where);
6544 /* WHERE or WHERE construct is part of a where-body-construct */
6546 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
6550 gfc_error ("Unsupported statement inside WHERE at %L",
6553 /* the next statement within the same where-body-construct */
6554 cnext = cnext->next;
6556 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6557 cblock = cblock->block;
6562 /* Traverse the FORALL body to check whether the following errors exist:
6563 1. For assignment, check if a many-to-one assignment happens.
6564 2. For WHERE statement, check the WHERE body to see if there is any
6565 many-to-one assignment. */
6568 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
6572 c = code->block->next;
6578 case EXEC_POINTER_ASSIGN:
6579 gfc_resolve_assign_in_forall (c, nvar, var_expr);
6582 case EXEC_ASSIGN_CALL:
6586 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
6587 there is no need to handle it here. */
6591 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
6596 /* The next statement in the FORALL body. */
6602 /* Counts the number of iterators needed inside a forall construct, including
6603 nested forall constructs. This is used to allocate the needed memory
6604 in gfc_resolve_forall. */
6607 gfc_count_forall_iterators (gfc_code *code)
6609 int max_iters, sub_iters, current_iters;
6610 gfc_forall_iterator *fa;
6612 gcc_assert(code->op == EXEC_FORALL);
6616 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6619 code = code->block->next;
6623 if (code->op == EXEC_FORALL)
6625 sub_iters = gfc_count_forall_iterators (code);
6626 if (sub_iters > max_iters)
6627 max_iters = sub_iters;
6632 return current_iters + max_iters;
6636 /* Given a FORALL construct, first resolve the FORALL iterator, then call
6637 gfc_resolve_forall_body to resolve the FORALL body. */
6640 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
6642 static gfc_expr **var_expr;
6643 static int total_var = 0;
6644 static int nvar = 0;
6646 gfc_forall_iterator *fa;
6651 /* Start to resolve a FORALL construct */
6652 if (forall_save == 0)
6654 /* Count the total number of FORALL index in the nested FORALL
6655 construct in order to allocate the VAR_EXPR with proper size. */
6656 total_var = gfc_count_forall_iterators (code);
6658 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
6659 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
6662 /* The information about FORALL iterator, including FORALL index start, end
6663 and stride. The FORALL index can not appear in start, end or stride. */
6664 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6666 /* Check if any outer FORALL index name is the same as the current
6668 for (i = 0; i < nvar; i++)
6670 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
6672 gfc_error ("An outer FORALL construct already has an index "
6673 "with this name %L", &fa->var->where);
6677 /* Record the current FORALL index. */
6678 var_expr[nvar] = gfc_copy_expr (fa->var);
6682 /* No memory leak. */
6683 gcc_assert (nvar <= total_var);
6686 /* Resolve the FORALL body. */
6687 gfc_resolve_forall_body (code, nvar, var_expr);
6689 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
6690 gfc_resolve_blocks (code->block, ns);
6694 /* Free only the VAR_EXPRs allocated in this frame. */
6695 for (i = nvar; i < tmp; i++)
6696 gfc_free_expr (var_expr[i]);
6700 /* We are in the outermost FORALL construct. */
6701 gcc_assert (forall_save == 0);
6703 /* VAR_EXPR is not needed any more. */
6704 gfc_free (var_expr);
6710 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL ,GOTO and
6713 static void resolve_code (gfc_code *, gfc_namespace *);
6716 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
6720 for (; b; b = b->block)
6722 t = gfc_resolve_expr (b->expr1);
6723 if (gfc_resolve_expr (b->expr2) == FAILURE)
6729 if (t == SUCCESS && b->expr1 != NULL
6730 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
6731 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
6738 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
6739 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
6744 resolve_branch (b->label1, b);
6757 case EXEC_OMP_ATOMIC:
6758 case EXEC_OMP_CRITICAL:
6760 case EXEC_OMP_MASTER:
6761 case EXEC_OMP_ORDERED:
6762 case EXEC_OMP_PARALLEL:
6763 case EXEC_OMP_PARALLEL_DO:
6764 case EXEC_OMP_PARALLEL_SECTIONS:
6765 case EXEC_OMP_PARALLEL_WORKSHARE:
6766 case EXEC_OMP_SECTIONS:
6767 case EXEC_OMP_SINGLE:
6769 case EXEC_OMP_TASKWAIT:
6770 case EXEC_OMP_WORKSHARE:
6774 gfc_internal_error ("resolve_block(): Bad block type");
6777 resolve_code (b->next, ns);
6782 /* Does everything to resolve an ordinary assignment. Returns true
6783 if this is an interface assignment. */
6785 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
6795 if (gfc_extend_assign (code, ns) == SUCCESS)
6797 lhs = code->ext.actual->expr;
6798 rhs = code->ext.actual->next->expr;
6799 if (gfc_pure (NULL) && !gfc_pure (code->symtree->n.sym))
6801 gfc_error ("Subroutine '%s' called instead of assignment at "
6802 "%L must be PURE", code->symtree->n.sym->name,
6807 /* Make a temporary rhs when there is a default initializer
6808 and rhs is the same symbol as the lhs. */
6809 if (rhs->expr_type == EXPR_VARIABLE
6810 && rhs->symtree->n.sym->ts.type == BT_DERIVED
6811 && has_default_initializer (rhs->symtree->n.sym->ts.derived)
6812 && (lhs->symtree->n.sym == rhs->symtree->n.sym))
6813 code->ext.actual->next->expr = gfc_get_parentheses (rhs);
6822 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
6823 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
6824 &code->loc) == FAILURE)
6827 /* Handle the case of a BOZ literal on the RHS. */
6828 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
6831 if (gfc_option.warn_surprising)
6832 gfc_warning ("BOZ literal at %L is bitwise transferred "
6833 "non-integer symbol '%s'", &code->loc,
6834 lhs->symtree->n.sym->name);
6836 if (!gfc_convert_boz (rhs, &lhs->ts))
6838 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
6840 if (rc == ARITH_UNDERFLOW)
6841 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
6842 ". This check can be disabled with the option "
6843 "-fno-range-check", &rhs->where);
6844 else if (rc == ARITH_OVERFLOW)
6845 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
6846 ". This check can be disabled with the option "
6847 "-fno-range-check", &rhs->where);
6848 else if (rc == ARITH_NAN)
6849 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
6850 ". This check can be disabled with the option "
6851 "-fno-range-check", &rhs->where);
6857 if (lhs->ts.type == BT_CHARACTER
6858 && gfc_option.warn_character_truncation)
6860 if (lhs->ts.cl != NULL
6861 && lhs->ts.cl->length != NULL
6862 && lhs->ts.cl->length->expr_type == EXPR_CONSTANT)
6863 llen = mpz_get_si (lhs->ts.cl->length->value.integer);
6865 if (rhs->expr_type == EXPR_CONSTANT)
6866 rlen = rhs->value.character.length;
6868 else if (rhs->ts.cl != NULL
6869 && rhs->ts.cl->length != NULL
6870 && rhs->ts.cl->length->expr_type == EXPR_CONSTANT)
6871 rlen = mpz_get_si (rhs->ts.cl->length->value.integer);
6873 if (rlen && llen && rlen > llen)
6874 gfc_warning_now ("CHARACTER expression will be truncated "
6875 "in assignment (%d/%d) at %L",
6876 llen, rlen, &code->loc);
6879 /* Ensure that a vector index expression for the lvalue is evaluated
6880 to a temporary if the lvalue symbol is referenced in it. */
6883 for (ref = lhs->ref; ref; ref= ref->next)
6884 if (ref->type == REF_ARRAY)
6886 for (n = 0; n < ref->u.ar.dimen; n++)
6887 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
6888 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
6889 ref->u.ar.start[n]))
6891 = gfc_get_parentheses (ref->u.ar.start[n]);
6895 if (gfc_pure (NULL))
6897 if (gfc_impure_variable (lhs->symtree->n.sym))
6899 gfc_error ("Cannot assign to variable '%s' in PURE "
6901 lhs->symtree->n.sym->name,
6906 if (lhs->ts.type == BT_DERIVED
6907 && lhs->expr_type == EXPR_VARIABLE
6908 && lhs->ts.derived->attr.pointer_comp
6909 && gfc_impure_variable (rhs->symtree->n.sym))
6911 gfc_error ("The impure variable at %L is assigned to "
6912 "a derived type variable with a POINTER "
6913 "component in a PURE procedure (12.6)",
6919 gfc_check_assign (lhs, rhs, 1);
6923 /* Given a block of code, recursively resolve everything pointed to by this
6927 resolve_code (gfc_code *code, gfc_namespace *ns)
6929 int omp_workshare_save;
6934 frame.prev = cs_base;
6938 find_reachable_labels (code);
6940 for (; code; code = code->next)
6942 frame.current = code;
6943 forall_save = forall_flag;
6945 if (code->op == EXEC_FORALL)
6948 gfc_resolve_forall (code, ns, forall_save);
6951 else if (code->block)
6953 omp_workshare_save = -1;
6956 case EXEC_OMP_PARALLEL_WORKSHARE:
6957 omp_workshare_save = omp_workshare_flag;
6958 omp_workshare_flag = 1;
6959 gfc_resolve_omp_parallel_blocks (code, ns);
6961 case EXEC_OMP_PARALLEL:
6962 case EXEC_OMP_PARALLEL_DO:
6963 case EXEC_OMP_PARALLEL_SECTIONS:
6965 omp_workshare_save = omp_workshare_flag;
6966 omp_workshare_flag = 0;
6967 gfc_resolve_omp_parallel_blocks (code, ns);
6970 gfc_resolve_omp_do_blocks (code, ns);
6972 case EXEC_OMP_WORKSHARE:
6973 omp_workshare_save = omp_workshare_flag;
6974 omp_workshare_flag = 1;
6977 gfc_resolve_blocks (code->block, ns);
6981 if (omp_workshare_save != -1)
6982 omp_workshare_flag = omp_workshare_save;
6986 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
6987 t = gfc_resolve_expr (code->expr1);
6988 forall_flag = forall_save;
6990 if (gfc_resolve_expr (code->expr2) == FAILURE)
6996 case EXEC_END_BLOCK:
7006 /* Keep track of which entry we are up to. */
7007 current_entry_id = code->ext.entry->id;
7011 resolve_where (code, NULL);
7015 if (code->expr1 != NULL)
7017 if (code->expr1->ts.type != BT_INTEGER)
7018 gfc_error ("ASSIGNED GOTO statement at %L requires an "
7019 "INTEGER variable", &code->expr1->where);
7020 else if (code->expr1->symtree->n.sym->attr.assign != 1)
7021 gfc_error ("Variable '%s' has not been assigned a target "
7022 "label at %L", code->expr1->symtree->n.sym->name,
7023 &code->expr1->where);
7026 resolve_branch (code->label1, code);
7030 if (code->expr1 != NULL
7031 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
7032 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
7033 "INTEGER return specifier", &code->expr1->where);
7036 case EXEC_INIT_ASSIGN:
7037 case EXEC_END_PROCEDURE:
7044 if (resolve_ordinary_assign (code, ns))
7049 case EXEC_LABEL_ASSIGN:
7050 if (code->label1->defined == ST_LABEL_UNKNOWN)
7051 gfc_error ("Label %d referenced at %L is never defined",
7052 code->label1->value, &code->label1->where);
7054 && (code->expr1->expr_type != EXPR_VARIABLE
7055 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
7056 || code->expr1->symtree->n.sym->ts.kind
7057 != gfc_default_integer_kind
7058 || code->expr1->symtree->n.sym->as != NULL))
7059 gfc_error ("ASSIGN statement at %L requires a scalar "
7060 "default INTEGER variable", &code->expr1->where);
7063 case EXEC_POINTER_ASSIGN:
7067 gfc_check_pointer_assign (code->expr1, code->expr2);
7070 case EXEC_ARITHMETIC_IF:
7072 && code->expr1->ts.type != BT_INTEGER
7073 && code->expr1->ts.type != BT_REAL)
7074 gfc_error ("Arithmetic IF statement at %L requires a numeric "
7075 "expression", &code->expr1->where);
7077 resolve_branch (code->label1, code);
7078 resolve_branch (code->label2, code);
7079 resolve_branch (code->label3, code);
7083 if (t == SUCCESS && code->expr1 != NULL
7084 && (code->expr1->ts.type != BT_LOGICAL
7085 || code->expr1->rank != 0))
7086 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7087 &code->expr1->where);
7092 resolve_call (code);
7096 resolve_typebound_call (code);
7100 resolve_ppc_call (code);
7104 /* Select is complicated. Also, a SELECT construct could be
7105 a transformed computed GOTO. */
7106 resolve_select (code);
7110 if (code->ext.iterator != NULL)
7112 gfc_iterator *iter = code->ext.iterator;
7113 if (gfc_resolve_iterator (iter, true) != FAILURE)
7114 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
7119 if (code->expr1 == NULL)
7120 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
7122 && (code->expr1->rank != 0
7123 || code->expr1->ts.type != BT_LOGICAL))
7124 gfc_error ("Exit condition of DO WHILE loop at %L must be "
7125 "a scalar LOGICAL expression", &code->expr1->where);
7130 resolve_allocate_deallocate (code, "ALLOCATE");
7134 case EXEC_DEALLOCATE:
7136 resolve_allocate_deallocate (code, "DEALLOCATE");
7141 if (gfc_resolve_open (code->ext.open) == FAILURE)
7144 resolve_branch (code->ext.open->err, code);
7148 if (gfc_resolve_close (code->ext.close) == FAILURE)
7151 resolve_branch (code->ext.close->err, code);
7154 case EXEC_BACKSPACE:
7158 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
7161 resolve_branch (code->ext.filepos->err, code);
7165 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7168 resolve_branch (code->ext.inquire->err, code);
7172 gcc_assert (code->ext.inquire != NULL);
7173 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7176 resolve_branch (code->ext.inquire->err, code);
7180 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
7183 resolve_branch (code->ext.wait->err, code);
7184 resolve_branch (code->ext.wait->end, code);
7185 resolve_branch (code->ext.wait->eor, code);
7190 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
7193 resolve_branch (code->ext.dt->err, code);
7194 resolve_branch (code->ext.dt->end, code);
7195 resolve_branch (code->ext.dt->eor, code);
7199 resolve_transfer (code);
7203 resolve_forall_iterators (code->ext.forall_iterator);
7205 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
7206 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
7207 "expression", &code->expr1->where);
7210 case EXEC_OMP_ATOMIC:
7211 case EXEC_OMP_BARRIER:
7212 case EXEC_OMP_CRITICAL:
7213 case EXEC_OMP_FLUSH:
7215 case EXEC_OMP_MASTER:
7216 case EXEC_OMP_ORDERED:
7217 case EXEC_OMP_SECTIONS:
7218 case EXEC_OMP_SINGLE:
7219 case EXEC_OMP_TASKWAIT:
7220 case EXEC_OMP_WORKSHARE:
7221 gfc_resolve_omp_directive (code, ns);
7224 case EXEC_OMP_PARALLEL:
7225 case EXEC_OMP_PARALLEL_DO:
7226 case EXEC_OMP_PARALLEL_SECTIONS:
7227 case EXEC_OMP_PARALLEL_WORKSHARE:
7229 omp_workshare_save = omp_workshare_flag;
7230 omp_workshare_flag = 0;
7231 gfc_resolve_omp_directive (code, ns);
7232 omp_workshare_flag = omp_workshare_save;
7236 gfc_internal_error ("resolve_code(): Bad statement code");
7240 cs_base = frame.prev;
7244 /* Resolve initial values and make sure they are compatible with
7248 resolve_values (gfc_symbol *sym)
7250 if (sym->value == NULL)
7253 if (gfc_resolve_expr (sym->value) == FAILURE)
7256 gfc_check_assign_symbol (sym, sym->value);
7260 /* Verify the binding labels for common blocks that are BIND(C). The label
7261 for a BIND(C) common block must be identical in all scoping units in which
7262 the common block is declared. Further, the binding label can not collide
7263 with any other global entity in the program. */
7266 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
7268 if (comm_block_tree->n.common->is_bind_c == 1)
7270 gfc_gsymbol *binding_label_gsym;
7271 gfc_gsymbol *comm_name_gsym;
7273 /* See if a global symbol exists by the common block's name. It may
7274 be NULL if the common block is use-associated. */
7275 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
7276 comm_block_tree->n.common->name);
7277 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
7278 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
7279 "with the global entity '%s' at %L",
7280 comm_block_tree->n.common->binding_label,
7281 comm_block_tree->n.common->name,
7282 &(comm_block_tree->n.common->where),
7283 comm_name_gsym->name, &(comm_name_gsym->where));
7284 else if (comm_name_gsym != NULL
7285 && strcmp (comm_name_gsym->name,
7286 comm_block_tree->n.common->name) == 0)
7288 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
7290 if (comm_name_gsym->binding_label == NULL)
7291 /* No binding label for common block stored yet; save this one. */
7292 comm_name_gsym->binding_label =
7293 comm_block_tree->n.common->binding_label;
7295 if (strcmp (comm_name_gsym->binding_label,
7296 comm_block_tree->n.common->binding_label) != 0)
7298 /* Common block names match but binding labels do not. */
7299 gfc_error ("Binding label '%s' for common block '%s' at %L "
7300 "does not match the binding label '%s' for common "
7302 comm_block_tree->n.common->binding_label,
7303 comm_block_tree->n.common->name,
7304 &(comm_block_tree->n.common->where),
7305 comm_name_gsym->binding_label,
7306 comm_name_gsym->name,
7307 &(comm_name_gsym->where));
7312 /* There is no binding label (NAME="") so we have nothing further to
7313 check and nothing to add as a global symbol for the label. */
7314 if (comm_block_tree->n.common->binding_label[0] == '\0' )
7317 binding_label_gsym =
7318 gfc_find_gsymbol (gfc_gsym_root,
7319 comm_block_tree->n.common->binding_label);
7320 if (binding_label_gsym == NULL)
7322 /* Need to make a global symbol for the binding label to prevent
7323 it from colliding with another. */
7324 binding_label_gsym =
7325 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
7326 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
7327 binding_label_gsym->type = GSYM_COMMON;
7331 /* If comm_name_gsym is NULL, the name common block is use
7332 associated and the name could be colliding. */
7333 if (binding_label_gsym->type != GSYM_COMMON)
7334 gfc_error ("Binding label '%s' for common block '%s' at %L "
7335 "collides with the global entity '%s' at %L",
7336 comm_block_tree->n.common->binding_label,
7337 comm_block_tree->n.common->name,
7338 &(comm_block_tree->n.common->where),
7339 binding_label_gsym->name,
7340 &(binding_label_gsym->where));
7341 else if (comm_name_gsym != NULL
7342 && (strcmp (binding_label_gsym->name,
7343 comm_name_gsym->binding_label) != 0)
7344 && (strcmp (binding_label_gsym->sym_name,
7345 comm_name_gsym->name) != 0))
7346 gfc_error ("Binding label '%s' for common block '%s' at %L "
7347 "collides with global entity '%s' at %L",
7348 binding_label_gsym->name, binding_label_gsym->sym_name,
7349 &(comm_block_tree->n.common->where),
7350 comm_name_gsym->name, &(comm_name_gsym->where));
7358 /* Verify any BIND(C) derived types in the namespace so we can report errors
7359 for them once, rather than for each variable declared of that type. */
7362 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
7364 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
7365 && derived_sym->attr.is_bind_c == 1)
7366 verify_bind_c_derived_type (derived_sym);
7372 /* Verify that any binding labels used in a given namespace do not collide
7373 with the names or binding labels of any global symbols. */
7376 gfc_verify_binding_labels (gfc_symbol *sym)
7380 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
7381 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
7383 gfc_gsymbol *bind_c_sym;
7385 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
7386 if (bind_c_sym != NULL
7387 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
7389 if (sym->attr.if_source == IFSRC_DECL
7390 && (bind_c_sym->type != GSYM_SUBROUTINE
7391 && bind_c_sym->type != GSYM_FUNCTION)
7392 && ((sym->attr.contained == 1
7393 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
7394 || (sym->attr.use_assoc == 1
7395 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
7397 /* Make sure global procedures don't collide with anything. */
7398 gfc_error ("Binding label '%s' at %L collides with the global "
7399 "entity '%s' at %L", sym->binding_label,
7400 &(sym->declared_at), bind_c_sym->name,
7401 &(bind_c_sym->where));
7404 else if (sym->attr.contained == 0
7405 && (sym->attr.if_source == IFSRC_IFBODY
7406 && sym->attr.flavor == FL_PROCEDURE)
7407 && (bind_c_sym->sym_name != NULL
7408 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
7410 /* Make sure procedures in interface bodies don't collide. */
7411 gfc_error ("Binding label '%s' in interface body at %L collides "
7412 "with the global entity '%s' at %L",
7414 &(sym->declared_at), bind_c_sym->name,
7415 &(bind_c_sym->where));
7418 else if (sym->attr.contained == 0
7419 && sym->attr.if_source == IFSRC_UNKNOWN)
7420 if ((sym->attr.use_assoc && bind_c_sym->mod_name
7421 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
7422 || sym->attr.use_assoc == 0)
7424 gfc_error ("Binding label '%s' at %L collides with global "
7425 "entity '%s' at %L", sym->binding_label,
7426 &(sym->declared_at), bind_c_sym->name,
7427 &(bind_c_sym->where));
7432 /* Clear the binding label to prevent checking multiple times. */
7433 sym->binding_label[0] = '\0';
7435 else if (bind_c_sym == NULL)
7437 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
7438 bind_c_sym->where = sym->declared_at;
7439 bind_c_sym->sym_name = sym->name;
7441 if (sym->attr.use_assoc == 1)
7442 bind_c_sym->mod_name = sym->module;
7444 if (sym->ns->proc_name != NULL)
7445 bind_c_sym->mod_name = sym->ns->proc_name->name;
7447 if (sym->attr.contained == 0)
7449 if (sym->attr.subroutine)
7450 bind_c_sym->type = GSYM_SUBROUTINE;
7451 else if (sym->attr.function)
7452 bind_c_sym->type = GSYM_FUNCTION;
7460 /* Resolve an index expression. */
7463 resolve_index_expr (gfc_expr *e)
7465 if (gfc_resolve_expr (e) == FAILURE)
7468 if (gfc_simplify_expr (e, 0) == FAILURE)
7471 if (gfc_specification_expr (e) == FAILURE)
7477 /* Resolve a charlen structure. */
7480 resolve_charlen (gfc_charlen *cl)
7489 specification_expr = 1;
7491 if (resolve_index_expr (cl->length) == FAILURE)
7493 specification_expr = 0;
7497 /* "If the character length parameter value evaluates to a negative
7498 value, the length of character entities declared is zero." */
7499 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
7501 gfc_warning_now ("CHARACTER variable has zero length at %L",
7502 &cl->length->where);
7503 gfc_replace_expr (cl->length, gfc_int_expr (0));
7506 /* Check that the character length is not too large. */
7507 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
7508 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
7509 && cl->length->ts.type == BT_INTEGER
7510 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
7512 gfc_error ("String length at %L is too large", &cl->length->where);
7520 /* Test for non-constant shape arrays. */
7523 is_non_constant_shape_array (gfc_symbol *sym)
7529 not_constant = false;
7530 if (sym->as != NULL)
7532 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
7533 has not been simplified; parameter array references. Do the
7534 simplification now. */
7535 for (i = 0; i < sym->as->rank; i++)
7537 e = sym->as->lower[i];
7538 if (e && (resolve_index_expr (e) == FAILURE
7539 || !gfc_is_constant_expr (e)))
7540 not_constant = true;
7542 e = sym->as->upper[i];
7543 if (e && (resolve_index_expr (e) == FAILURE
7544 || !gfc_is_constant_expr (e)))
7545 not_constant = true;
7548 return not_constant;
7551 /* Given a symbol and an initialization expression, add code to initialize
7552 the symbol to the function entry. */
7554 build_init_assign (gfc_symbol *sym, gfc_expr *init)
7558 gfc_namespace *ns = sym->ns;
7560 /* Search for the function namespace if this is a contained
7561 function without an explicit result. */
7562 if (sym->attr.function && sym == sym->result
7563 && sym->name != sym->ns->proc_name->name)
7566 for (;ns; ns = ns->sibling)
7567 if (strcmp (ns->proc_name->name, sym->name) == 0)
7573 gfc_free_expr (init);
7577 /* Build an l-value expression for the result. */
7578 lval = gfc_lval_expr_from_sym (sym);
7580 /* Add the code at scope entry. */
7581 init_st = gfc_get_code ();
7582 init_st->next = ns->code;
7585 /* Assign the default initializer to the l-value. */
7586 init_st->loc = sym->declared_at;
7587 init_st->op = EXEC_INIT_ASSIGN;
7588 init_st->expr1 = lval;
7589 init_st->expr2 = init;
7592 /* Assign the default initializer to a derived type variable or result. */
7595 apply_default_init (gfc_symbol *sym)
7597 gfc_expr *init = NULL;
7599 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7602 if (sym->ts.type == BT_DERIVED && sym->ts.derived)
7603 init = gfc_default_initializer (&sym->ts);
7608 build_init_assign (sym, init);
7611 /* Build an initializer for a local integer, real, complex, logical, or
7612 character variable, based on the command line flags finit-local-zero,
7613 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
7614 null if the symbol should not have a default initialization. */
7616 build_default_init_expr (gfc_symbol *sym)
7619 gfc_expr *init_expr;
7622 /* These symbols should never have a default initialization. */
7623 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
7624 || sym->attr.external
7626 || sym->attr.pointer
7627 || sym->attr.in_equivalence
7628 || sym->attr.in_common
7631 || sym->attr.cray_pointee
7632 || sym->attr.cray_pointer)
7635 /* Now we'll try to build an initializer expression. */
7636 init_expr = gfc_get_expr ();
7637 init_expr->expr_type = EXPR_CONSTANT;
7638 init_expr->ts.type = sym->ts.type;
7639 init_expr->ts.kind = sym->ts.kind;
7640 init_expr->where = sym->declared_at;
7642 /* We will only initialize integers, reals, complex, logicals, and
7643 characters, and only if the corresponding command-line flags
7644 were set. Otherwise, we free init_expr and return null. */
7645 switch (sym->ts.type)
7648 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
7649 mpz_init_set_si (init_expr->value.integer,
7650 gfc_option.flag_init_integer_value);
7653 gfc_free_expr (init_expr);
7659 mpfr_init (init_expr->value.real);
7660 switch (gfc_option.flag_init_real)
7662 case GFC_INIT_REAL_SNAN:
7663 init_expr->is_snan = 1;
7665 case GFC_INIT_REAL_NAN:
7666 mpfr_set_nan (init_expr->value.real);
7669 case GFC_INIT_REAL_INF:
7670 mpfr_set_inf (init_expr->value.real, 1);
7673 case GFC_INIT_REAL_NEG_INF:
7674 mpfr_set_inf (init_expr->value.real, -1);
7677 case GFC_INIT_REAL_ZERO:
7678 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
7682 gfc_free_expr (init_expr);
7690 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
7692 mpfr_init (init_expr->value.complex.r);
7693 mpfr_init (init_expr->value.complex.i);
7695 switch (gfc_option.flag_init_real)
7697 case GFC_INIT_REAL_SNAN:
7698 init_expr->is_snan = 1;
7700 case GFC_INIT_REAL_NAN:
7701 mpfr_set_nan (mpc_realref (init_expr->value.complex));
7702 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
7705 case GFC_INIT_REAL_INF:
7706 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
7707 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
7710 case GFC_INIT_REAL_NEG_INF:
7711 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
7712 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
7715 case GFC_INIT_REAL_ZERO:
7717 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
7719 mpfr_set_ui (init_expr->value.complex.r, 0.0, GFC_RND_MODE);
7720 mpfr_set_ui (init_expr->value.complex.i, 0.0, GFC_RND_MODE);
7725 gfc_free_expr (init_expr);
7732 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
7733 init_expr->value.logical = 0;
7734 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
7735 init_expr->value.logical = 1;
7738 gfc_free_expr (init_expr);
7744 /* For characters, the length must be constant in order to
7745 create a default initializer. */
7746 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
7747 && sym->ts.cl->length
7748 && sym->ts.cl->length->expr_type == EXPR_CONSTANT)
7750 char_len = mpz_get_si (sym->ts.cl->length->value.integer);
7751 init_expr->value.character.length = char_len;
7752 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
7753 for (i = 0; i < char_len; i++)
7754 init_expr->value.character.string[i]
7755 = (unsigned char) gfc_option.flag_init_character_value;
7759 gfc_free_expr (init_expr);
7765 gfc_free_expr (init_expr);
7771 /* Add an initialization expression to a local variable. */
7773 apply_default_init_local (gfc_symbol *sym)
7775 gfc_expr *init = NULL;
7777 /* The symbol should be a variable or a function return value. */
7778 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7779 || (sym->attr.function && sym->result != sym))
7782 /* Try to build the initializer expression. If we can't initialize
7783 this symbol, then init will be NULL. */
7784 init = build_default_init_expr (sym);
7788 /* For saved variables, we don't want to add an initializer at
7789 function entry, so we just add a static initializer. */
7790 if (sym->attr.save || sym->ns->save_all)
7792 /* Don't clobber an existing initializer! */
7793 gcc_assert (sym->value == NULL);
7798 build_init_assign (sym, init);
7801 /* Resolution of common features of flavors variable and procedure. */
7804 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
7806 /* Constraints on deferred shape variable. */
7807 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
7809 if (sym->attr.allocatable)
7811 if (sym->attr.dimension)
7812 gfc_error ("Allocatable array '%s' at %L must have "
7813 "a deferred shape", sym->name, &sym->declared_at);
7815 gfc_error ("Scalar object '%s' at %L may not be ALLOCATABLE",
7816 sym->name, &sym->declared_at);
7820 if (sym->attr.pointer && sym->attr.dimension)
7822 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
7823 sym->name, &sym->declared_at);
7830 if (!mp_flag && !sym->attr.allocatable
7831 && !sym->attr.pointer && !sym->attr.dummy)
7833 gfc_error ("Array '%s' at %L cannot have a deferred shape",
7834 sym->name, &sym->declared_at);
7842 /* Additional checks for symbols with flavor variable and derived
7843 type. To be called from resolve_fl_variable. */
7846 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
7848 gcc_assert (sym->ts.type == BT_DERIVED);
7850 /* Check to see if a derived type is blocked from being host
7851 associated by the presence of another class I symbol in the same
7852 namespace. 14.6.1.3 of the standard and the discussion on
7853 comp.lang.fortran. */
7854 if (sym->ns != sym->ts.derived->ns
7855 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
7858 gfc_find_symbol (sym->ts.derived->name, sym->ns, 0, &s);
7859 if (s && s->attr.flavor != FL_DERIVED)
7861 gfc_error ("The type '%s' cannot be host associated at %L "
7862 "because it is blocked by an incompatible object "
7863 "of the same name declared at %L",
7864 sym->ts.derived->name, &sym->declared_at,
7870 /* 4th constraint in section 11.3: "If an object of a type for which
7871 component-initialization is specified (R429) appears in the
7872 specification-part of a module and does not have the ALLOCATABLE
7873 or POINTER attribute, the object shall have the SAVE attribute."
7875 The check for initializers is performed with
7876 has_default_initializer because gfc_default_initializer generates
7877 a hidden default for allocatable components. */
7878 if (!(sym->value || no_init_flag) && sym->ns->proc_name
7879 && sym->ns->proc_name->attr.flavor == FL_MODULE
7880 && !sym->ns->save_all && !sym->attr.save
7881 && !sym->attr.pointer && !sym->attr.allocatable
7882 && has_default_initializer (sym->ts.derived))
7884 gfc_error("Object '%s' at %L must have the SAVE attribute for "
7885 "default initialization of a component",
7886 sym->name, &sym->declared_at);
7890 /* Assign default initializer. */
7891 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
7892 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
7894 sym->value = gfc_default_initializer (&sym->ts);
7901 /* Resolve symbols with flavor variable. */
7904 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
7906 int no_init_flag, automatic_flag;
7908 const char *auto_save_msg;
7910 auto_save_msg = "Automatic object '%s' at %L cannot have the "
7913 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
7916 /* Set this flag to check that variables are parameters of all entries.
7917 This check is effected by the call to gfc_resolve_expr through
7918 is_non_constant_shape_array. */
7919 specification_expr = 1;
7921 if (sym->ns->proc_name
7922 && (sym->ns->proc_name->attr.flavor == FL_MODULE
7923 || sym->ns->proc_name->attr.is_main_program)
7924 && !sym->attr.use_assoc
7925 && !sym->attr.allocatable
7926 && !sym->attr.pointer
7927 && is_non_constant_shape_array (sym))
7929 /* The shape of a main program or module array needs to be
7931 gfc_error ("The module or main program array '%s' at %L must "
7932 "have constant shape", sym->name, &sym->declared_at);
7933 specification_expr = 0;
7937 if (sym->ts.type == BT_CHARACTER)
7939 /* Make sure that character string variables with assumed length are
7941 e = sym->ts.cl->length;
7942 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
7944 gfc_error ("Entity with assumed character length at %L must be a "
7945 "dummy argument or a PARAMETER", &sym->declared_at);
7949 if (e && sym->attr.save && !gfc_is_constant_expr (e))
7951 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
7955 if (!gfc_is_constant_expr (e)
7956 && !(e->expr_type == EXPR_VARIABLE
7957 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
7958 && sym->ns->proc_name
7959 && (sym->ns->proc_name->attr.flavor == FL_MODULE
7960 || sym->ns->proc_name->attr.is_main_program)
7961 && !sym->attr.use_assoc)
7963 gfc_error ("'%s' at %L must have constant character length "
7964 "in this context", sym->name, &sym->declared_at);
7969 if (sym->value == NULL && sym->attr.referenced)
7970 apply_default_init_local (sym); /* Try to apply a default initialization. */
7972 /* Determine if the symbol may not have an initializer. */
7973 no_init_flag = automatic_flag = 0;
7974 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
7975 || sym->attr.intrinsic || sym->attr.result)
7977 else if (sym->attr.dimension && !sym->attr.pointer
7978 && is_non_constant_shape_array (sym))
7980 no_init_flag = automatic_flag = 1;
7982 /* Also, they must not have the SAVE attribute.
7983 SAVE_IMPLICIT is checked below. */
7984 if (sym->attr.save == SAVE_EXPLICIT)
7986 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
7991 /* Ensure that any initializer is simplified. */
7993 gfc_simplify_expr (sym->value, 1);
7995 /* Reject illegal initializers. */
7996 if (!sym->mark && sym->value)
7998 if (sym->attr.allocatable)
7999 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
8000 sym->name, &sym->declared_at);
8001 else if (sym->attr.external)
8002 gfc_error ("External '%s' at %L cannot have an initializer",
8003 sym->name, &sym->declared_at);
8004 else if (sym->attr.dummy
8005 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
8006 gfc_error ("Dummy '%s' at %L cannot have an initializer",
8007 sym->name, &sym->declared_at);
8008 else if (sym->attr.intrinsic)
8009 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
8010 sym->name, &sym->declared_at);
8011 else if (sym->attr.result)
8012 gfc_error ("Function result '%s' at %L cannot have an initializer",
8013 sym->name, &sym->declared_at);
8014 else if (automatic_flag)
8015 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
8016 sym->name, &sym->declared_at);
8023 if (sym->ts.type == BT_DERIVED)
8024 return resolve_fl_variable_derived (sym, no_init_flag);
8030 /* Resolve a procedure. */
8033 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
8035 gfc_formal_arglist *arg;
8037 if (sym->attr.ambiguous_interfaces && !sym->attr.referenced)
8038 gfc_warning ("Although not referenced, '%s' at %L has ambiguous "
8039 "interfaces", sym->name, &sym->declared_at);
8041 if (sym->attr.function
8042 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8045 if (sym->ts.type == BT_CHARACTER)
8047 gfc_charlen *cl = sym->ts.cl;
8049 if (cl && cl->length && gfc_is_constant_expr (cl->length)
8050 && resolve_charlen (cl) == FAILURE)
8053 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
8055 if (sym->attr.proc == PROC_ST_FUNCTION)
8057 gfc_error ("Character-valued statement function '%s' at %L must "
8058 "have constant length", sym->name, &sym->declared_at);
8062 if (sym->attr.external && sym->formal == NULL
8063 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
8065 gfc_error ("Automatic character length function '%s' at %L must "
8066 "have an explicit interface", sym->name,
8073 /* Ensure that derived type for are not of a private type. Internal
8074 module procedures are excluded by 2.2.3.3 - i.e., they are not
8075 externally accessible and can access all the objects accessible in
8077 if (!(sym->ns->parent
8078 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
8079 && gfc_check_access(sym->attr.access, sym->ns->default_access))
8081 gfc_interface *iface;
8083 for (arg = sym->formal; arg; arg = arg->next)
8086 && arg->sym->ts.type == BT_DERIVED
8087 && !arg->sym->ts.derived->attr.use_assoc
8088 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8089 arg->sym->ts.derived->ns->default_access)
8090 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
8091 "PRIVATE type and cannot be a dummy argument"
8092 " of '%s', which is PUBLIC at %L",
8093 arg->sym->name, sym->name, &sym->declared_at)
8096 /* Stop this message from recurring. */
8097 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8102 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8103 PRIVATE to the containing module. */
8104 for (iface = sym->generic; iface; iface = iface->next)
8106 for (arg = iface->sym->formal; arg; arg = arg->next)
8109 && arg->sym->ts.type == BT_DERIVED
8110 && !arg->sym->ts.derived->attr.use_assoc
8111 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8112 arg->sym->ts.derived->ns->default_access)
8113 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8114 "'%s' in PUBLIC interface '%s' at %L "
8115 "takes dummy arguments of '%s' which is "
8116 "PRIVATE", iface->sym->name, sym->name,
8117 &iface->sym->declared_at,
8118 gfc_typename (&arg->sym->ts)) == FAILURE)
8120 /* Stop this message from recurring. */
8121 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8127 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8128 PRIVATE to the containing module. */
8129 for (iface = sym->generic; iface; iface = iface->next)
8131 for (arg = iface->sym->formal; arg; arg = arg->next)
8134 && arg->sym->ts.type == BT_DERIVED
8135 && !arg->sym->ts.derived->attr.use_assoc
8136 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8137 arg->sym->ts.derived->ns->default_access)
8138 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8139 "'%s' in PUBLIC interface '%s' at %L "
8140 "takes dummy arguments of '%s' which is "
8141 "PRIVATE", iface->sym->name, sym->name,
8142 &iface->sym->declared_at,
8143 gfc_typename (&arg->sym->ts)) == FAILURE)
8145 /* Stop this message from recurring. */
8146 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8153 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
8154 && !sym->attr.proc_pointer)
8156 gfc_error ("Function '%s' at %L cannot have an initializer",
8157 sym->name, &sym->declared_at);
8161 /* An external symbol may not have an initializer because it is taken to be
8162 a procedure. Exception: Procedure Pointers. */
8163 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
8165 gfc_error ("External object '%s' at %L may not have an initializer",
8166 sym->name, &sym->declared_at);
8170 /* An elemental function is required to return a scalar 12.7.1 */
8171 if (sym->attr.elemental && sym->attr.function && sym->as)
8173 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
8174 "result", sym->name, &sym->declared_at);
8175 /* Reset so that the error only occurs once. */
8176 sym->attr.elemental = 0;
8180 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
8181 char-len-param shall not be array-valued, pointer-valued, recursive
8182 or pure. ....snip... A character value of * may only be used in the
8183 following ways: (i) Dummy arg of procedure - dummy associates with
8184 actual length; (ii) To declare a named constant; or (iii) External
8185 function - but length must be declared in calling scoping unit. */
8186 if (sym->attr.function
8187 && sym->ts.type == BT_CHARACTER
8188 && sym->ts.cl && sym->ts.cl->length == NULL)
8190 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
8191 || (sym->attr.recursive) || (sym->attr.pure))
8193 if (sym->as && sym->as->rank)
8194 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8195 "array-valued", sym->name, &sym->declared_at);
8197 if (sym->attr.pointer)
8198 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8199 "pointer-valued", sym->name, &sym->declared_at);
8202 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8203 "pure", sym->name, &sym->declared_at);
8205 if (sym->attr.recursive)
8206 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8207 "recursive", sym->name, &sym->declared_at);
8212 /* Appendix B.2 of the standard. Contained functions give an
8213 error anyway. Fixed-form is likely to be F77/legacy. */
8214 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
8215 gfc_notify_std (GFC_STD_F95_OBS, "CHARACTER(*) function "
8216 "'%s' at %L is obsolescent in fortran 95",
8217 sym->name, &sym->declared_at);
8220 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
8222 gfc_formal_arglist *curr_arg;
8223 int has_non_interop_arg = 0;
8225 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
8226 sym->common_block) == FAILURE)
8228 /* Clear these to prevent looking at them again if there was an
8230 sym->attr.is_bind_c = 0;
8231 sym->attr.is_c_interop = 0;
8232 sym->ts.is_c_interop = 0;
8236 /* So far, no errors have been found. */
8237 sym->attr.is_c_interop = 1;
8238 sym->ts.is_c_interop = 1;
8241 curr_arg = sym->formal;
8242 while (curr_arg != NULL)
8244 /* Skip implicitly typed dummy args here. */
8245 if (curr_arg->sym->attr.implicit_type == 0)
8246 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
8247 /* If something is found to fail, record the fact so we
8248 can mark the symbol for the procedure as not being
8249 BIND(C) to try and prevent multiple errors being
8251 has_non_interop_arg = 1;
8253 curr_arg = curr_arg->next;
8256 /* See if any of the arguments were not interoperable and if so, clear
8257 the procedure symbol to prevent duplicate error messages. */
8258 if (has_non_interop_arg != 0)
8260 sym->attr.is_c_interop = 0;
8261 sym->ts.is_c_interop = 0;
8262 sym->attr.is_bind_c = 0;
8266 if (!sym->attr.proc_pointer)
8268 if (sym->attr.save == SAVE_EXPLICIT)
8270 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
8271 "in '%s' at %L", sym->name, &sym->declared_at);
8274 if (sym->attr.intent)
8276 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
8277 "in '%s' at %L", sym->name, &sym->declared_at);
8280 if (sym->attr.subroutine && sym->attr.result)
8282 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
8283 "in '%s' at %L", sym->name, &sym->declared_at);
8286 if (sym->attr.external && sym->attr.function
8287 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
8288 || sym->attr.contained))
8290 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
8291 "in '%s' at %L", sym->name, &sym->declared_at);
8294 if (strcmp ("ppr@", sym->name) == 0)
8296 gfc_error ("Procedure pointer result '%s' at %L "
8297 "is missing the pointer attribute",
8298 sym->ns->proc_name->name, &sym->declared_at);
8307 /* Resolve a list of finalizer procedures. That is, after they have hopefully
8308 been defined and we now know their defined arguments, check that they fulfill
8309 the requirements of the standard for procedures used as finalizers. */
8312 gfc_resolve_finalizers (gfc_symbol* derived)
8314 gfc_finalizer* list;
8315 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
8316 gfc_try result = SUCCESS;
8317 bool seen_scalar = false;
8319 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
8322 /* Walk over the list of finalizer-procedures, check them, and if any one
8323 does not fit in with the standard's definition, print an error and remove
8324 it from the list. */
8325 prev_link = &derived->f2k_derived->finalizers;
8326 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
8332 /* Skip this finalizer if we already resolved it. */
8333 if (list->proc_tree)
8335 prev_link = &(list->next);
8339 /* Check this exists and is a SUBROUTINE. */
8340 if (!list->proc_sym->attr.subroutine)
8342 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
8343 list->proc_sym->name, &list->where);
8347 /* We should have exactly one argument. */
8348 if (!list->proc_sym->formal || list->proc_sym->formal->next)
8350 gfc_error ("FINAL procedure at %L must have exactly one argument",
8354 arg = list->proc_sym->formal->sym;
8356 /* This argument must be of our type. */
8357 if (arg->ts.type != BT_DERIVED || arg->ts.derived != derived)
8359 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
8360 &arg->declared_at, derived->name);
8364 /* It must neither be a pointer nor allocatable nor optional. */
8365 if (arg->attr.pointer)
8367 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
8371 if (arg->attr.allocatable)
8373 gfc_error ("Argument of FINAL procedure at %L must not be"
8374 " ALLOCATABLE", &arg->declared_at);
8377 if (arg->attr.optional)
8379 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
8384 /* It must not be INTENT(OUT). */
8385 if (arg->attr.intent == INTENT_OUT)
8387 gfc_error ("Argument of FINAL procedure at %L must not be"
8388 " INTENT(OUT)", &arg->declared_at);
8392 /* Warn if the procedure is non-scalar and not assumed shape. */
8393 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
8394 && arg->as->type != AS_ASSUMED_SHAPE)
8395 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
8396 " shape argument", &arg->declared_at);
8398 /* Check that it does not match in kind and rank with a FINAL procedure
8399 defined earlier. To really loop over the *earlier* declarations,
8400 we need to walk the tail of the list as new ones were pushed at the
8402 /* TODO: Handle kind parameters once they are implemented. */
8403 my_rank = (arg->as ? arg->as->rank : 0);
8404 for (i = list->next; i; i = i->next)
8406 /* Argument list might be empty; that is an error signalled earlier,
8407 but we nevertheless continued resolving. */
8408 if (i->proc_sym->formal)
8410 gfc_symbol* i_arg = i->proc_sym->formal->sym;
8411 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
8412 if (i_rank == my_rank)
8414 gfc_error ("FINAL procedure '%s' declared at %L has the same"
8415 " rank (%d) as '%s'",
8416 list->proc_sym->name, &list->where, my_rank,
8423 /* Is this the/a scalar finalizer procedure? */
8424 if (!arg->as || arg->as->rank == 0)
8427 /* Find the symtree for this procedure. */
8428 gcc_assert (!list->proc_tree);
8429 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
8431 prev_link = &list->next;
8434 /* Remove wrong nodes immediately from the list so we don't risk any
8435 troubles in the future when they might fail later expectations. */
8439 *prev_link = list->next;
8440 gfc_free_finalizer (i);
8443 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
8444 were nodes in the list, must have been for arrays. It is surely a good
8445 idea to have a scalar version there if there's something to finalize. */
8446 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
8447 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
8448 " defined at %L, suggest also scalar one",
8449 derived->name, &derived->declared_at);
8451 /* TODO: Remove this error when finalization is finished. */
8452 gfc_error ("Finalization at %L is not yet implemented",
8453 &derived->declared_at);
8459 /* Check that it is ok for the typebound procedure proc to override the
8463 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
8466 const gfc_symbol* proc_target;
8467 const gfc_symbol* old_target;
8468 unsigned proc_pass_arg, old_pass_arg, argpos;
8469 gfc_formal_arglist* proc_formal;
8470 gfc_formal_arglist* old_formal;
8472 /* This procedure should only be called for non-GENERIC proc. */
8473 gcc_assert (!proc->n.tb->is_generic);
8475 /* If the overwritten procedure is GENERIC, this is an error. */
8476 if (old->n.tb->is_generic)
8478 gfc_error ("Can't overwrite GENERIC '%s' at %L",
8479 old->name, &proc->n.tb->where);
8483 where = proc->n.tb->where;
8484 proc_target = proc->n.tb->u.specific->n.sym;
8485 old_target = old->n.tb->u.specific->n.sym;
8487 /* Check that overridden binding is not NON_OVERRIDABLE. */
8488 if (old->n.tb->non_overridable)
8490 gfc_error ("'%s' at %L overrides a procedure binding declared"
8491 " NON_OVERRIDABLE", proc->name, &where);
8495 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
8496 if (!old->n.tb->deferred && proc->n.tb->deferred)
8498 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
8499 " non-DEFERRED binding", proc->name, &where);
8503 /* If the overridden binding is PURE, the overriding must be, too. */
8504 if (old_target->attr.pure && !proc_target->attr.pure)
8506 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
8507 proc->name, &where);
8511 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
8512 is not, the overriding must not be either. */
8513 if (old_target->attr.elemental && !proc_target->attr.elemental)
8515 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
8516 " ELEMENTAL", proc->name, &where);
8519 if (!old_target->attr.elemental && proc_target->attr.elemental)
8521 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
8522 " be ELEMENTAL, either", proc->name, &where);
8526 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
8528 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
8530 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
8531 " SUBROUTINE", proc->name, &where);
8535 /* If the overridden binding is a FUNCTION, the overriding must also be a
8536 FUNCTION and have the same characteristics. */
8537 if (old_target->attr.function)
8539 if (!proc_target->attr.function)
8541 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
8542 " FUNCTION", proc->name, &where);
8546 /* FIXME: Do more comprehensive checking (including, for instance, the
8547 rank and array-shape). */
8548 gcc_assert (proc_target->result && old_target->result);
8549 if (!gfc_compare_types (&proc_target->result->ts,
8550 &old_target->result->ts))
8552 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
8553 " matching result types", proc->name, &where);
8558 /* If the overridden binding is PUBLIC, the overriding one must not be
8560 if (old->n.tb->access == ACCESS_PUBLIC
8561 && proc->n.tb->access == ACCESS_PRIVATE)
8563 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
8564 " PRIVATE", proc->name, &where);
8568 /* Compare the formal argument lists of both procedures. This is also abused
8569 to find the position of the passed-object dummy arguments of both
8570 bindings as at least the overridden one might not yet be resolved and we
8571 need those positions in the check below. */
8572 proc_pass_arg = old_pass_arg = 0;
8573 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
8575 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
8578 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
8579 proc_formal && old_formal;
8580 proc_formal = proc_formal->next, old_formal = old_formal->next)
8582 if (proc->n.tb->pass_arg
8583 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
8584 proc_pass_arg = argpos;
8585 if (old->n.tb->pass_arg
8586 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
8587 old_pass_arg = argpos;
8589 /* Check that the names correspond. */
8590 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
8592 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
8593 " to match the corresponding argument of the overridden"
8594 " procedure", proc_formal->sym->name, proc->name, &where,
8595 old_formal->sym->name);
8599 /* Check that the types correspond if neither is the passed-object
8601 /* FIXME: Do more comprehensive testing here. */
8602 if (proc_pass_arg != argpos && old_pass_arg != argpos
8603 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
8605 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L in"
8606 " in respect to the overridden procedure",
8607 proc_formal->sym->name, proc->name, &where);
8613 if (proc_formal || old_formal)
8615 gfc_error ("'%s' at %L must have the same number of formal arguments as"
8616 " the overridden procedure", proc->name, &where);
8620 /* If the overridden binding is NOPASS, the overriding one must also be
8622 if (old->n.tb->nopass && !proc->n.tb->nopass)
8624 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
8625 " NOPASS", proc->name, &where);
8629 /* If the overridden binding is PASS(x), the overriding one must also be
8630 PASS and the passed-object dummy arguments must correspond. */
8631 if (!old->n.tb->nopass)
8633 if (proc->n.tb->nopass)
8635 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
8636 " PASS", proc->name, &where);
8640 if (proc_pass_arg != old_pass_arg)
8642 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
8643 " the same position as the passed-object dummy argument of"
8644 " the overridden procedure", proc->name, &where);
8653 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
8656 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
8657 const char* generic_name, locus where)
8662 gcc_assert (t1->specific && t2->specific);
8663 gcc_assert (!t1->specific->is_generic);
8664 gcc_assert (!t2->specific->is_generic);
8666 sym1 = t1->specific->u.specific->n.sym;
8667 sym2 = t2->specific->u.specific->n.sym;
8669 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
8670 if (sym1->attr.subroutine != sym2->attr.subroutine
8671 || sym1->attr.function != sym2->attr.function)
8673 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
8674 " GENERIC '%s' at %L",
8675 sym1->name, sym2->name, generic_name, &where);
8679 /* Compare the interfaces. */
8680 if (gfc_compare_interfaces (sym1, sym2, 1, 0, NULL, 0))
8682 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
8683 sym1->name, sym2->name, generic_name, &where);
8691 /* Resolve a GENERIC procedure binding for a derived type. */
8694 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
8696 gfc_tbp_generic* target;
8697 gfc_symtree* first_target;
8698 gfc_symbol* super_type;
8699 gfc_symtree* inherited;
8702 gcc_assert (st->n.tb);
8703 gcc_assert (st->n.tb->is_generic);
8705 where = st->n.tb->where;
8706 super_type = gfc_get_derived_super_type (derived);
8708 /* Find the overridden binding if any. */
8709 st->n.tb->overridden = NULL;
8712 gfc_symtree* overridden;
8713 overridden = gfc_find_typebound_proc (super_type, NULL, st->name, true);
8715 if (overridden && overridden->n.tb)
8716 st->n.tb->overridden = overridden->n.tb;
8719 /* Try to find the specific bindings for the symtrees in our target-list. */
8720 gcc_assert (st->n.tb->u.generic);
8721 for (target = st->n.tb->u.generic; target; target = target->next)
8722 if (!target->specific)
8724 gfc_typebound_proc* overridden_tbp;
8726 const char* target_name;
8728 target_name = target->specific_st->name;
8730 /* Defined for this type directly. */
8731 if (target->specific_st->n.tb)
8733 target->specific = target->specific_st->n.tb;
8734 goto specific_found;
8737 /* Look for an inherited specific binding. */
8740 inherited = gfc_find_typebound_proc (super_type, NULL,
8745 gcc_assert (inherited->n.tb);
8746 target->specific = inherited->n.tb;
8747 goto specific_found;
8751 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
8752 " at %L", target_name, st->name, &where);
8755 /* Once we've found the specific binding, check it is not ambiguous with
8756 other specifics already found or inherited for the same GENERIC. */
8758 gcc_assert (target->specific);
8760 /* This must really be a specific binding! */
8761 if (target->specific->is_generic)
8763 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
8764 " '%s' is GENERIC, too", st->name, &where, target_name);
8768 /* Check those already resolved on this type directly. */
8769 for (g = st->n.tb->u.generic; g; g = g->next)
8770 if (g != target && g->specific
8771 && check_generic_tbp_ambiguity (target, g, st->name, where)
8775 /* Check for ambiguity with inherited specific targets. */
8776 for (overridden_tbp = st->n.tb->overridden; overridden_tbp;
8777 overridden_tbp = overridden_tbp->overridden)
8778 if (overridden_tbp->is_generic)
8780 for (g = overridden_tbp->u.generic; g; g = g->next)
8782 gcc_assert (g->specific);
8783 if (check_generic_tbp_ambiguity (target, g,
8784 st->name, where) == FAILURE)
8790 /* If we attempt to "overwrite" a specific binding, this is an error. */
8791 if (st->n.tb->overridden && !st->n.tb->overridden->is_generic)
8793 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
8794 " the same name", st->name, &where);
8798 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
8799 all must have the same attributes here. */
8800 first_target = st->n.tb->u.generic->specific->u.specific;
8801 gcc_assert (first_target);
8802 st->n.tb->subroutine = first_target->n.sym->attr.subroutine;
8803 st->n.tb->function = first_target->n.sym->attr.function;
8809 /* Resolve the type-bound procedures for a derived type. */
8811 static gfc_symbol* resolve_bindings_derived;
8812 static gfc_try resolve_bindings_result;
8815 resolve_typebound_procedure (gfc_symtree* stree)
8820 gfc_symbol* super_type;
8821 gfc_component* comp;
8825 /* Undefined specific symbol from GENERIC target definition. */
8829 if (stree->n.tb->error)
8832 /* If this is a GENERIC binding, use that routine. */
8833 if (stree->n.tb->is_generic)
8835 if (resolve_typebound_generic (resolve_bindings_derived, stree)
8841 /* Get the target-procedure to check it. */
8842 gcc_assert (!stree->n.tb->is_generic);
8843 gcc_assert (stree->n.tb->u.specific);
8844 proc = stree->n.tb->u.specific->n.sym;
8845 where = stree->n.tb->where;
8847 /* Default access should already be resolved from the parser. */
8848 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
8850 /* It should be a module procedure or an external procedure with explicit
8851 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
8852 if ((!proc->attr.subroutine && !proc->attr.function)
8853 || (proc->attr.proc != PROC_MODULE
8854 && proc->attr.if_source != IFSRC_IFBODY)
8855 || (proc->attr.abstract && !stree->n.tb->deferred))
8857 gfc_error ("'%s' must be a module procedure or an external procedure with"
8858 " an explicit interface at %L", proc->name, &where);
8861 stree->n.tb->subroutine = proc->attr.subroutine;
8862 stree->n.tb->function = proc->attr.function;
8864 /* Find the super-type of the current derived type. We could do this once and
8865 store in a global if speed is needed, but as long as not I believe this is
8866 more readable and clearer. */
8867 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
8869 /* If PASS, resolve and check arguments if not already resolved / loaded
8870 from a .mod file. */
8871 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
8873 if (stree->n.tb->pass_arg)
8875 gfc_formal_arglist* i;
8877 /* If an explicit passing argument name is given, walk the arg-list
8881 stree->n.tb->pass_arg_num = 1;
8882 for (i = proc->formal; i; i = i->next)
8884 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
8889 ++stree->n.tb->pass_arg_num;
8894 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
8896 proc->name, stree->n.tb->pass_arg, &where,
8897 stree->n.tb->pass_arg);
8903 /* Otherwise, take the first one; there should in fact be at least
8905 stree->n.tb->pass_arg_num = 1;
8908 gfc_error ("Procedure '%s' with PASS at %L must have at"
8909 " least one argument", proc->name, &where);
8912 me_arg = proc->formal->sym;
8915 /* Now check that the argument-type matches. */
8916 gcc_assert (me_arg);
8917 if (me_arg->ts.type != BT_DERIVED
8918 || me_arg->ts.derived != resolve_bindings_derived)
8920 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
8921 " the derived-type '%s'", me_arg->name, proc->name,
8922 me_arg->name, &where, resolve_bindings_derived->name);
8926 gfc_warning ("Polymorphic entities are not yet implemented,"
8927 " non-polymorphic passed-object dummy argument of '%s'"
8928 " at %L accepted", proc->name, &where);
8931 /* If we are extending some type, check that we don't override a procedure
8932 flagged NON_OVERRIDABLE. */
8933 stree->n.tb->overridden = NULL;
8936 gfc_symtree* overridden;
8937 overridden = gfc_find_typebound_proc (super_type, NULL,
8940 if (overridden && overridden->n.tb)
8941 stree->n.tb->overridden = overridden->n.tb;
8943 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
8947 /* See if there's a name collision with a component directly in this type. */
8948 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
8949 if (!strcmp (comp->name, stree->name))
8951 gfc_error ("Procedure '%s' at %L has the same name as a component of"
8953 stree->name, &where, resolve_bindings_derived->name);
8957 /* Try to find a name collision with an inherited component. */
8958 if (super_type && gfc_find_component (super_type, stree->name, true, true))
8960 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
8961 " component of '%s'",
8962 stree->name, &where, resolve_bindings_derived->name);
8966 stree->n.tb->error = 0;
8970 resolve_bindings_result = FAILURE;
8971 stree->n.tb->error = 1;
8975 resolve_typebound_procedures (gfc_symbol* derived)
8977 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
8980 resolve_bindings_derived = derived;
8981 resolve_bindings_result = SUCCESS;
8982 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
8983 &resolve_typebound_procedure);
8985 return resolve_bindings_result;
8989 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
8990 to give all identical derived types the same backend_decl. */
8992 add_dt_to_dt_list (gfc_symbol *derived)
8994 gfc_dt_list *dt_list;
8996 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
8997 if (derived == dt_list->derived)
9000 if (dt_list == NULL)
9002 dt_list = gfc_get_dt_list ();
9003 dt_list->next = gfc_derived_types;
9004 dt_list->derived = derived;
9005 gfc_derived_types = dt_list;
9010 /* Ensure that a derived-type is really not abstract, meaning that every
9011 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
9014 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
9019 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
9021 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
9024 if (st->n.tb && st->n.tb->deferred)
9026 gfc_symtree* overriding;
9027 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true);
9028 gcc_assert (overriding && overriding->n.tb);
9029 if (overriding->n.tb->deferred)
9031 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
9032 " '%s' is DEFERRED and not overridden",
9033 sub->name, &sub->declared_at, st->name);
9042 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
9044 /* The algorithm used here is to recursively travel up the ancestry of sub
9045 and for each ancestor-type, check all bindings. If any of them is
9046 DEFERRED, look it up starting from sub and see if the found (overriding)
9047 binding is not DEFERRED.
9048 This is not the most efficient way to do this, but it should be ok and is
9049 clearer than something sophisticated. */
9051 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
9053 /* Walk bindings of this ancestor. */
9054 if (ancestor->f2k_derived)
9057 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
9062 /* Find next ancestor type and recurse on it. */
9063 ancestor = gfc_get_derived_super_type (ancestor);
9065 return ensure_not_abstract (sub, ancestor);
9071 static void resolve_symbol (gfc_symbol *sym);
9074 /* Resolve the components of a derived type. */
9077 resolve_fl_derived (gfc_symbol *sym)
9079 gfc_symbol* super_type;
9083 super_type = gfc_get_derived_super_type (sym);
9085 /* Ensure the extended type gets resolved before we do. */
9086 if (super_type && resolve_fl_derived (super_type) == FAILURE)
9089 /* An ABSTRACT type must be extensible. */
9090 if (sym->attr.abstract && (sym->attr.is_bind_c || sym->attr.sequence))
9092 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
9093 sym->name, &sym->declared_at);
9097 for (c = sym->components; c != NULL; c = c->next)
9099 if (c->attr.proc_pointer && c->ts.interface)
9101 if (c->ts.interface->attr.procedure)
9102 gfc_error ("Interface '%s', used by procedure pointer component "
9103 "'%s' at %L, is declared in a later PROCEDURE statement",
9104 c->ts.interface->name, c->name, &c->loc);
9106 /* Get the attributes from the interface (now resolved). */
9107 if (c->ts.interface->attr.if_source
9108 || c->ts.interface->attr.intrinsic)
9110 gfc_symbol *ifc = c->ts.interface;
9112 if (ifc->formal && !ifc->formal_ns)
9113 resolve_symbol (ifc);
9115 if (ifc->attr.intrinsic)
9116 resolve_intrinsic (ifc, &ifc->declared_at);
9120 c->ts = ifc->result->ts;
9121 c->attr.allocatable = ifc->result->attr.allocatable;
9122 c->attr.pointer = ifc->result->attr.pointer;
9123 c->attr.dimension = ifc->result->attr.dimension;
9124 c->as = gfc_copy_array_spec (ifc->result->as);
9129 c->attr.allocatable = ifc->attr.allocatable;
9130 c->attr.pointer = ifc->attr.pointer;
9131 c->attr.dimension = ifc->attr.dimension;
9132 c->as = gfc_copy_array_spec (ifc->as);
9134 c->ts.interface = ifc;
9135 c->attr.function = ifc->attr.function;
9136 c->attr.subroutine = ifc->attr.subroutine;
9137 gfc_copy_formal_args_ppc (c, ifc);
9139 c->attr.pure = ifc->attr.pure;
9140 c->attr.elemental = ifc->attr.elemental;
9141 c->attr.recursive = ifc->attr.recursive;
9142 c->attr.always_explicit = ifc->attr.always_explicit;
9143 /* Replace symbols in array spec. */
9147 for (i = 0; i < c->as->rank; i++)
9149 gfc_expr_replace_comp (c->as->lower[i], c);
9150 gfc_expr_replace_comp (c->as->upper[i], c);
9153 /* Copy char length. */
9156 c->ts.cl = gfc_new_charlen (sym->ns);
9157 c->ts.cl->resolved = ifc->ts.cl->resolved;
9158 c->ts.cl->length = gfc_copy_expr (ifc->ts.cl->length);
9159 /* TODO: gfc_expr_replace_symbols (c->ts.cl->length, c);*/
9162 else if (c->ts.interface->name[0] != '\0')
9164 gfc_error ("Interface '%s' of procedure pointer component "
9165 "'%s' at %L must be explicit", c->ts.interface->name,
9170 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
9172 c->ts = *gfc_get_default_type (c->name, NULL);
9173 c->attr.implicit_type = 1;
9176 /* Procedure pointer components: Check PASS arg. */
9177 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0)
9181 if (c->tb->pass_arg)
9183 gfc_formal_arglist* i;
9185 /* If an explicit passing argument name is given, walk the arg-list
9189 c->tb->pass_arg_num = 1;
9190 for (i = c->formal; i; i = i->next)
9192 if (!strcmp (i->sym->name, c->tb->pass_arg))
9197 c->tb->pass_arg_num++;
9202 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
9203 "at %L has no argument '%s'", c->name,
9204 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
9211 /* Otherwise, take the first one; there should in fact be at least
9213 c->tb->pass_arg_num = 1;
9216 gfc_error ("Procedure pointer component '%s' with PASS at %L "
9217 "must have at least one argument",
9222 me_arg = c->formal->sym;
9225 /* Now check that the argument-type matches. */
9226 gcc_assert (me_arg);
9227 if (me_arg->ts.type != BT_DERIVED
9228 || me_arg->ts.derived != sym)
9230 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
9231 " the derived type '%s'", me_arg->name, c->name,
9232 me_arg->name, &c->loc, sym->name);
9237 /* Check for C453. */
9238 if (me_arg->attr.dimension)
9240 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
9241 "must be scalar", me_arg->name, c->name, me_arg->name,
9247 if (me_arg->attr.pointer)
9249 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
9250 "may not have the POINTER attribute", me_arg->name,
9251 c->name, me_arg->name, &c->loc);
9256 if (me_arg->attr.allocatable)
9258 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
9259 "may not be ALLOCATABLE", me_arg->name, c->name,
9260 me_arg->name, &c->loc);
9265 /* TODO: Make this an error once CLASS is implemented. */
9266 if (!sym->attr.sequence)
9267 gfc_warning ("Polymorphic entities are not yet implemented,"
9268 " non-polymorphic passed-object dummy argument of '%s'"
9269 " at %L accepted", c->name, &c->loc);
9273 /* Check type-spec if this is not the parent-type component. */
9274 if ((!sym->attr.extension || c != sym->components)
9275 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
9278 /* If this type is an extension, see if this component has the same name
9279 as an inherited type-bound procedure. */
9281 && gfc_find_typebound_proc (super_type, NULL, c->name, true))
9283 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
9284 " inherited type-bound procedure",
9285 c->name, sym->name, &c->loc);
9289 if (c->ts.type == BT_CHARACTER)
9291 if (c->ts.cl->length == NULL
9292 || (resolve_charlen (c->ts.cl) == FAILURE)
9293 || !gfc_is_constant_expr (c->ts.cl->length))
9295 gfc_error ("Character length of component '%s' needs to "
9296 "be a constant specification expression at %L",
9298 c->ts.cl->length ? &c->ts.cl->length->where : &c->loc);
9303 if (c->ts.type == BT_DERIVED
9304 && sym->component_access != ACCESS_PRIVATE
9305 && gfc_check_access (sym->attr.access, sym->ns->default_access)
9306 && !is_sym_host_assoc (c->ts.derived, sym->ns)
9307 && !c->ts.derived->attr.use_assoc
9308 && !gfc_check_access (c->ts.derived->attr.access,
9309 c->ts.derived->ns->default_access)
9310 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
9311 "is a PRIVATE type and cannot be a component of "
9312 "'%s', which is PUBLIC at %L", c->name,
9313 sym->name, &sym->declared_at) == FAILURE)
9316 if (sym->attr.sequence)
9318 if (c->ts.type == BT_DERIVED && c->ts.derived->attr.sequence == 0)
9320 gfc_error ("Component %s of SEQUENCE type declared at %L does "
9321 "not have the SEQUENCE attribute",
9322 c->ts.derived->name, &sym->declared_at);
9327 if (c->ts.type == BT_DERIVED && c->attr.pointer
9328 && c->ts.derived->components == NULL
9329 && !c->ts.derived->attr.zero_comp)
9331 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
9332 "that has not been declared", c->name, sym->name,
9337 /* Ensure that all the derived type components are put on the
9338 derived type list; even in formal namespaces, where derived type
9339 pointer components might not have been declared. */
9340 if (c->ts.type == BT_DERIVED
9342 && c->ts.derived->components
9344 && sym != c->ts.derived)
9345 add_dt_to_dt_list (c->ts.derived);
9347 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
9351 for (i = 0; i < c->as->rank; i++)
9353 if (c->as->lower[i] == NULL
9354 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
9355 || !gfc_is_constant_expr (c->as->lower[i])
9356 || c->as->upper[i] == NULL
9357 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
9358 || !gfc_is_constant_expr (c->as->upper[i]))
9360 gfc_error ("Component '%s' of '%s' at %L must have "
9361 "constant array bounds",
9362 c->name, sym->name, &c->loc);
9368 /* Resolve the type-bound procedures. */
9369 if (resolve_typebound_procedures (sym) == FAILURE)
9372 /* Resolve the finalizer procedures. */
9373 if (gfc_resolve_finalizers (sym) == FAILURE)
9376 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
9377 all DEFERRED bindings are overridden. */
9378 if (super_type && super_type->attr.abstract && !sym->attr.abstract
9379 && ensure_not_abstract (sym, super_type) == FAILURE)
9382 /* Add derived type to the derived type list. */
9383 add_dt_to_dt_list (sym);
9390 resolve_fl_namelist (gfc_symbol *sym)
9395 /* Reject PRIVATE objects in a PUBLIC namelist. */
9396 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
9398 for (nl = sym->namelist; nl; nl = nl->next)
9400 if (!nl->sym->attr.use_assoc
9401 && !is_sym_host_assoc (nl->sym, sym->ns)
9402 && !gfc_check_access(nl->sym->attr.access,
9403 nl->sym->ns->default_access))
9405 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
9406 "cannot be member of PUBLIC namelist '%s' at %L",
9407 nl->sym->name, sym->name, &sym->declared_at);
9411 /* Types with private components that came here by USE-association. */
9412 if (nl->sym->ts.type == BT_DERIVED
9413 && derived_inaccessible (nl->sym->ts.derived))
9415 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
9416 "components and cannot be member of namelist '%s' at %L",
9417 nl->sym->name, sym->name, &sym->declared_at);
9421 /* Types with private components that are defined in the same module. */
9422 if (nl->sym->ts.type == BT_DERIVED
9423 && !is_sym_host_assoc (nl->sym->ts.derived, sym->ns)
9424 && !gfc_check_access (nl->sym->ts.derived->attr.private_comp
9425 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
9426 nl->sym->ns->default_access))
9428 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
9429 "cannot be a member of PUBLIC namelist '%s' at %L",
9430 nl->sym->name, sym->name, &sym->declared_at);
9436 for (nl = sym->namelist; nl; nl = nl->next)
9438 /* Reject namelist arrays of assumed shape. */
9439 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
9440 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
9441 "must not have assumed shape in namelist "
9442 "'%s' at %L", nl->sym->name, sym->name,
9443 &sym->declared_at) == FAILURE)
9446 /* Reject namelist arrays that are not constant shape. */
9447 if (is_non_constant_shape_array (nl->sym))
9449 gfc_error ("NAMELIST array object '%s' must have constant "
9450 "shape in namelist '%s' at %L", nl->sym->name,
9451 sym->name, &sym->declared_at);
9455 /* Namelist objects cannot have allocatable or pointer components. */
9456 if (nl->sym->ts.type != BT_DERIVED)
9459 if (nl->sym->ts.derived->attr.alloc_comp)
9461 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9462 "have ALLOCATABLE components",
9463 nl->sym->name, sym->name, &sym->declared_at);
9467 if (nl->sym->ts.derived->attr.pointer_comp)
9469 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9470 "have POINTER components",
9471 nl->sym->name, sym->name, &sym->declared_at);
9477 /* 14.1.2 A module or internal procedure represent local entities
9478 of the same type as a namelist member and so are not allowed. */
9479 for (nl = sym->namelist; nl; nl = nl->next)
9481 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
9484 if (nl->sym->attr.function && nl->sym == nl->sym->result)
9485 if ((nl->sym == sym->ns->proc_name)
9487 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
9491 if (nl->sym && nl->sym->name)
9492 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
9493 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
9495 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
9496 "attribute in '%s' at %L", nlsym->name,
9507 resolve_fl_parameter (gfc_symbol *sym)
9509 /* A parameter array's shape needs to be constant. */
9511 && (sym->as->type == AS_DEFERRED
9512 || is_non_constant_shape_array (sym)))
9514 gfc_error ("Parameter array '%s' at %L cannot be automatic "
9515 "or of deferred shape", sym->name, &sym->declared_at);
9519 /* Make sure a parameter that has been implicitly typed still
9520 matches the implicit type, since PARAMETER statements can precede
9521 IMPLICIT statements. */
9522 if (sym->attr.implicit_type
9523 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
9526 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
9527 "later IMPLICIT type", sym->name, &sym->declared_at);
9531 /* Make sure the types of derived parameters are consistent. This
9532 type checking is deferred until resolution because the type may
9533 refer to a derived type from the host. */
9534 if (sym->ts.type == BT_DERIVED
9535 && !gfc_compare_types (&sym->ts, &sym->value->ts))
9537 gfc_error ("Incompatible derived type in PARAMETER at %L",
9538 &sym->value->where);
9545 /* Do anything necessary to resolve a symbol. Right now, we just
9546 assume that an otherwise unknown symbol is a variable. This sort
9547 of thing commonly happens for symbols in module. */
9550 resolve_symbol (gfc_symbol *sym)
9552 int check_constant, mp_flag;
9553 gfc_symtree *symtree;
9554 gfc_symtree *this_symtree;
9558 if (sym->attr.flavor == FL_UNKNOWN)
9561 /* If we find that a flavorless symbol is an interface in one of the
9562 parent namespaces, find its symtree in this namespace, free the
9563 symbol and set the symtree to point to the interface symbol. */
9564 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
9566 symtree = gfc_find_symtree (ns->sym_root, sym->name);
9567 if (symtree && symtree->n.sym->generic)
9569 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
9573 gfc_free_symbol (sym);
9574 symtree->n.sym->refs++;
9575 this_symtree->n.sym = symtree->n.sym;
9580 /* Otherwise give it a flavor according to such attributes as
9582 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
9583 sym->attr.flavor = FL_VARIABLE;
9586 sym->attr.flavor = FL_PROCEDURE;
9587 if (sym->attr.dimension)
9588 sym->attr.function = 1;
9592 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
9593 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
9595 if (sym->attr.procedure && sym->ts.interface
9596 && sym->attr.if_source != IFSRC_DECL)
9598 if (sym->ts.interface == sym)
9600 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
9601 "interface", sym->name, &sym->declared_at);
9604 if (sym->ts.interface->attr.procedure)
9606 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
9607 " in a later PROCEDURE statement", sym->ts.interface->name,
9608 sym->name,&sym->declared_at);
9612 /* Get the attributes from the interface (now resolved). */
9613 if (sym->ts.interface->attr.if_source
9614 || sym->ts.interface->attr.intrinsic)
9616 gfc_symbol *ifc = sym->ts.interface;
9617 resolve_symbol (ifc);
9619 if (ifc->attr.intrinsic)
9620 resolve_intrinsic (ifc, &ifc->declared_at);
9623 sym->ts = ifc->result->ts;
9626 sym->ts.interface = ifc;
9627 sym->attr.function = ifc->attr.function;
9628 sym->attr.subroutine = ifc->attr.subroutine;
9629 gfc_copy_formal_args (sym, ifc);
9631 sym->attr.allocatable = ifc->attr.allocatable;
9632 sym->attr.pointer = ifc->attr.pointer;
9633 sym->attr.pure = ifc->attr.pure;
9634 sym->attr.elemental = ifc->attr.elemental;
9635 sym->attr.dimension = ifc->attr.dimension;
9636 sym->attr.recursive = ifc->attr.recursive;
9637 sym->attr.always_explicit = ifc->attr.always_explicit;
9638 /* Copy array spec. */
9639 sym->as = gfc_copy_array_spec (ifc->as);
9643 for (i = 0; i < sym->as->rank; i++)
9645 gfc_expr_replace_symbols (sym->as->lower[i], sym);
9646 gfc_expr_replace_symbols (sym->as->upper[i], sym);
9649 /* Copy char length. */
9652 sym->ts.cl = gfc_new_charlen (sym->ns);
9653 sym->ts.cl->resolved = ifc->ts.cl->resolved;
9654 sym->ts.cl->length = gfc_copy_expr (ifc->ts.cl->length);
9655 gfc_expr_replace_symbols (sym->ts.cl->length, sym);
9658 else if (sym->ts.interface->name[0] != '\0')
9660 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
9661 sym->ts.interface->name, sym->name, &sym->declared_at);
9666 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
9669 /* Symbols that are module procedures with results (functions) have
9670 the types and array specification copied for type checking in
9671 procedures that call them, as well as for saving to a module
9672 file. These symbols can't stand the scrutiny that their results
9674 mp_flag = (sym->result != NULL && sym->result != sym);
9677 /* Make sure that the intrinsic is consistent with its internal
9678 representation. This needs to be done before assigning a default
9679 type to avoid spurious warnings. */
9680 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic)
9682 gfc_intrinsic_sym* isym;
9685 /* We already know this one is an intrinsic, so we don't call
9686 gfc_is_intrinsic for full checking but rather use gfc_find_function and
9687 gfc_find_subroutine directly to check whether it is a function or
9690 if ((isym = gfc_find_function (sym->name)))
9692 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
9693 && !sym->attr.implicit_type)
9694 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
9695 " ignored", sym->name, &sym->declared_at);
9697 else if ((isym = gfc_find_subroutine (sym->name)))
9699 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
9701 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
9702 " specifier", sym->name, &sym->declared_at);
9708 gfc_error ("'%s' declared INTRINSIC at %L does not exist",
9709 sym->name, &sym->declared_at);
9713 /* Check it is actually available in the standard settings. */
9714 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
9717 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
9718 " available in the current standard settings but %s. Use"
9719 " an appropriate -std=* option or enable -fall-intrinsics"
9720 " in order to use it.",
9721 sym->name, &sym->declared_at, symstd);
9726 /* Assign default type to symbols that need one and don't have one. */
9727 if (sym->ts.type == BT_UNKNOWN)
9729 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
9730 gfc_set_default_type (sym, 1, NULL);
9732 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
9733 && !sym->attr.function && !sym->attr.subroutine
9734 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
9735 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
9737 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
9739 /* The specific case of an external procedure should emit an error
9740 in the case that there is no implicit type. */
9742 gfc_set_default_type (sym, sym->attr.external, NULL);
9745 /* Result may be in another namespace. */
9746 resolve_symbol (sym->result);
9748 if (!sym->result->attr.proc_pointer)
9750 sym->ts = sym->result->ts;
9751 sym->as = gfc_copy_array_spec (sym->result->as);
9752 sym->attr.dimension = sym->result->attr.dimension;
9753 sym->attr.pointer = sym->result->attr.pointer;
9754 sym->attr.allocatable = sym->result->attr.allocatable;
9760 /* Assumed size arrays and assumed shape arrays must be dummy
9764 && (sym->as->type == AS_ASSUMED_SIZE
9765 || sym->as->type == AS_ASSUMED_SHAPE)
9766 && sym->attr.dummy == 0)
9768 if (sym->as->type == AS_ASSUMED_SIZE)
9769 gfc_error ("Assumed size array at %L must be a dummy argument",
9772 gfc_error ("Assumed shape array at %L must be a dummy argument",
9777 /* Make sure symbols with known intent or optional are really dummy
9778 variable. Because of ENTRY statement, this has to be deferred
9779 until resolution time. */
9781 if (!sym->attr.dummy
9782 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
9784 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
9788 if (sym->attr.value && !sym->attr.dummy)
9790 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
9791 "it is not a dummy argument", sym->name, &sym->declared_at);
9795 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
9797 gfc_charlen *cl = sym->ts.cl;
9798 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9800 gfc_error ("Character dummy variable '%s' at %L with VALUE "
9801 "attribute must have constant length",
9802 sym->name, &sym->declared_at);
9806 if (sym->ts.is_c_interop
9807 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
9809 gfc_error ("C interoperable character dummy variable '%s' at %L "
9810 "with VALUE attribute must have length one",
9811 sym->name, &sym->declared_at);
9816 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
9817 do this for something that was implicitly typed because that is handled
9818 in gfc_set_default_type. Handle dummy arguments and procedure
9819 definitions separately. Also, anything that is use associated is not
9820 handled here but instead is handled in the module it is declared in.
9821 Finally, derived type definitions are allowed to be BIND(C) since that
9822 only implies that they're interoperable, and they are checked fully for
9823 interoperability when a variable is declared of that type. */
9824 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
9825 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
9826 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
9828 gfc_try t = SUCCESS;
9830 /* First, make sure the variable is declared at the
9831 module-level scope (J3/04-007, Section 15.3). */
9832 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
9833 sym->attr.in_common == 0)
9835 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
9836 "is neither a COMMON block nor declared at the "
9837 "module level scope", sym->name, &(sym->declared_at));
9840 else if (sym->common_head != NULL)
9842 t = verify_com_block_vars_c_interop (sym->common_head);
9846 /* If type() declaration, we need to verify that the components
9847 of the given type are all C interoperable, etc. */
9848 if (sym->ts.type == BT_DERIVED &&
9849 sym->ts.derived->attr.is_c_interop != 1)
9851 /* Make sure the user marked the derived type as BIND(C). If
9852 not, call the verify routine. This could print an error
9853 for the derived type more than once if multiple variables
9854 of that type are declared. */
9855 if (sym->ts.derived->attr.is_bind_c != 1)
9856 verify_bind_c_derived_type (sym->ts.derived);
9860 /* Verify the variable itself as C interoperable if it
9861 is BIND(C). It is not possible for this to succeed if
9862 the verify_bind_c_derived_type failed, so don't have to handle
9863 any error returned by verify_bind_c_derived_type. */
9864 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9870 /* clear the is_bind_c flag to prevent reporting errors more than
9871 once if something failed. */
9872 sym->attr.is_bind_c = 0;
9877 /* If a derived type symbol has reached this point, without its
9878 type being declared, we have an error. Notice that most
9879 conditions that produce undefined derived types have already
9880 been dealt with. However, the likes of:
9881 implicit type(t) (t) ..... call foo (t) will get us here if
9882 the type is not declared in the scope of the implicit
9883 statement. Change the type to BT_UNKNOWN, both because it is so
9884 and to prevent an ICE. */
9885 if (sym->ts.type == BT_DERIVED && sym->ts.derived->components == NULL
9886 && !sym->ts.derived->attr.zero_comp)
9888 gfc_error ("The derived type '%s' at %L is of type '%s', "
9889 "which has not been defined", sym->name,
9890 &sym->declared_at, sym->ts.derived->name);
9891 sym->ts.type = BT_UNKNOWN;
9895 /* Make sure that the derived type has been resolved and that the
9896 derived type is visible in the symbol's namespace, if it is a
9897 module function and is not PRIVATE. */
9898 if (sym->ts.type == BT_DERIVED
9899 && sym->ts.derived->attr.use_assoc
9900 && sym->ns->proc_name
9901 && sym->ns->proc_name->attr.flavor == FL_MODULE)
9905 if (resolve_fl_derived (sym->ts.derived) == FAILURE)
9908 gfc_find_symbol (sym->ts.derived->name, sym->ns, 1, &ds);
9909 if (!ds && sym->attr.function
9910 && gfc_check_access (sym->attr.access, sym->ns->default_access))
9912 symtree = gfc_new_symtree (&sym->ns->sym_root,
9913 sym->ts.derived->name);
9914 symtree->n.sym = sym->ts.derived;
9915 sym->ts.derived->refs++;
9919 /* Unless the derived-type declaration is use associated, Fortran 95
9920 does not allow public entries of private derived types.
9921 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
9923 if (sym->ts.type == BT_DERIVED
9924 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
9925 && !sym->ts.derived->attr.use_assoc
9926 && gfc_check_access (sym->attr.access, sym->ns->default_access)
9927 && !gfc_check_access (sym->ts.derived->attr.access,
9928 sym->ts.derived->ns->default_access)
9929 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
9930 "of PRIVATE derived type '%s'",
9931 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
9932 : "variable", sym->name, &sym->declared_at,
9933 sym->ts.derived->name) == FAILURE)
9936 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
9937 default initialization is defined (5.1.2.4.4). */
9938 if (sym->ts.type == BT_DERIVED
9940 && sym->attr.intent == INTENT_OUT
9942 && sym->as->type == AS_ASSUMED_SIZE)
9944 for (c = sym->ts.derived->components; c; c = c->next)
9948 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
9949 "ASSUMED SIZE and so cannot have a default initializer",
9950 sym->name, &sym->declared_at);
9956 switch (sym->attr.flavor)
9959 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
9964 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
9969 if (resolve_fl_namelist (sym) == FAILURE)
9974 if (resolve_fl_parameter (sym) == FAILURE)
9982 /* Resolve array specifier. Check as well some constraints
9983 on COMMON blocks. */
9985 check_constant = sym->attr.in_common && !sym->attr.pointer;
9987 /* Set the formal_arg_flag so that check_conflict will not throw
9988 an error for host associated variables in the specification
9989 expression for an array_valued function. */
9990 if (sym->attr.function && sym->as)
9991 formal_arg_flag = 1;
9993 gfc_resolve_array_spec (sym->as, check_constant);
9995 formal_arg_flag = 0;
9997 /* Resolve formal namespaces. */
9998 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
9999 && !sym->attr.contained)
10000 gfc_resolve (sym->formal_ns);
10002 /* Make sure the formal namespace is present. */
10003 if (sym->formal && !sym->formal_ns)
10005 gfc_formal_arglist *formal = sym->formal;
10006 while (formal && !formal->sym)
10007 formal = formal->next;
10011 sym->formal_ns = formal->sym->ns;
10012 sym->formal_ns->refs++;
10016 /* Check threadprivate restrictions. */
10017 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
10018 && (!sym->attr.in_common
10019 && sym->module == NULL
10020 && (sym->ns->proc_name == NULL
10021 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
10022 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
10024 /* If we have come this far we can apply default-initializers, as
10025 described in 14.7.5, to those variables that have not already
10026 been assigned one. */
10027 if (sym->ts.type == BT_DERIVED
10028 && sym->attr.referenced
10029 && sym->ns == gfc_current_ns
10031 && !sym->attr.allocatable
10032 && !sym->attr.alloc_comp)
10034 symbol_attribute *a = &sym->attr;
10036 if ((!a->save && !a->dummy && !a->pointer
10037 && !a->in_common && !a->use_assoc
10038 && !(a->function && sym != sym->result))
10039 || (a->dummy && a->intent == INTENT_OUT))
10040 apply_default_init (sym);
10043 /* If this symbol has a type-spec, check it. */
10044 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
10045 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
10046 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
10052 /************* Resolve DATA statements *************/
10056 gfc_data_value *vnode;
10062 /* Advance the values structure to point to the next value in the data list. */
10065 next_data_value (void)
10067 while (mpz_cmp_ui (values.left, 0) == 0)
10069 if (!gfc_is_constant_expr (values.vnode->expr))
10070 gfc_error ("non-constant DATA value at %L",
10071 &values.vnode->expr->where);
10073 if (values.vnode->next == NULL)
10076 values.vnode = values.vnode->next;
10077 mpz_set (values.left, values.vnode->repeat);
10085 check_data_variable (gfc_data_variable *var, locus *where)
10091 ar_type mark = AR_UNKNOWN;
10093 mpz_t section_index[GFC_MAX_DIMENSIONS];
10099 if (gfc_resolve_expr (var->expr) == FAILURE)
10103 mpz_init_set_si (offset, 0);
10106 if (e->expr_type != EXPR_VARIABLE)
10107 gfc_internal_error ("check_data_variable(): Bad expression");
10109 sym = e->symtree->n.sym;
10111 if (sym->ns->is_block_data && !sym->attr.in_common)
10113 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
10114 sym->name, &sym->declared_at);
10117 if (e->ref == NULL && sym->as)
10119 gfc_error ("DATA array '%s' at %L must be specified in a previous"
10120 " declaration", sym->name, where);
10124 has_pointer = sym->attr.pointer;
10126 for (ref = e->ref; ref; ref = ref->next)
10128 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
10132 && ref->type == REF_ARRAY
10133 && ref->u.ar.type != AR_FULL)
10135 gfc_error ("DATA element '%s' at %L is a pointer and so must "
10136 "be a full array", sym->name, where);
10141 if (e->rank == 0 || has_pointer)
10143 mpz_init_set_ui (size, 1);
10150 /* Find the array section reference. */
10151 for (ref = e->ref; ref; ref = ref->next)
10153 if (ref->type != REF_ARRAY)
10155 if (ref->u.ar.type == AR_ELEMENT)
10161 /* Set marks according to the reference pattern. */
10162 switch (ref->u.ar.type)
10170 /* Get the start position of array section. */
10171 gfc_get_section_index (ar, section_index, &offset);
10176 gcc_unreachable ();
10179 if (gfc_array_size (e, &size) == FAILURE)
10181 gfc_error ("Nonconstant array section at %L in DATA statement",
10183 mpz_clear (offset);
10190 while (mpz_cmp_ui (size, 0) > 0)
10192 if (next_data_value () == FAILURE)
10194 gfc_error ("DATA statement at %L has more variables than values",
10200 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
10204 /* If we have more than one element left in the repeat count,
10205 and we have more than one element left in the target variable,
10206 then create a range assignment. */
10207 /* FIXME: Only done for full arrays for now, since array sections
10209 if (mark == AR_FULL && ref && ref->next == NULL
10210 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
10214 if (mpz_cmp (size, values.left) >= 0)
10216 mpz_init_set (range, values.left);
10217 mpz_sub (size, size, values.left);
10218 mpz_set_ui (values.left, 0);
10222 mpz_init_set (range, size);
10223 mpz_sub (values.left, values.left, size);
10224 mpz_set_ui (size, 0);
10227 gfc_assign_data_value_range (var->expr, values.vnode->expr,
10230 mpz_add (offset, offset, range);
10234 /* Assign initial value to symbol. */
10237 mpz_sub_ui (values.left, values.left, 1);
10238 mpz_sub_ui (size, size, 1);
10240 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
10244 if (mark == AR_FULL)
10245 mpz_add_ui (offset, offset, 1);
10247 /* Modify the array section indexes and recalculate the offset
10248 for next element. */
10249 else if (mark == AR_SECTION)
10250 gfc_advance_section (section_index, ar, &offset);
10254 if (mark == AR_SECTION)
10256 for (i = 0; i < ar->dimen; i++)
10257 mpz_clear (section_index[i]);
10261 mpz_clear (offset);
10267 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
10269 /* Iterate over a list of elements in a DATA statement. */
10272 traverse_data_list (gfc_data_variable *var, locus *where)
10275 iterator_stack frame;
10276 gfc_expr *e, *start, *end, *step;
10277 gfc_try retval = SUCCESS;
10279 mpz_init (frame.value);
10281 start = gfc_copy_expr (var->iter.start);
10282 end = gfc_copy_expr (var->iter.end);
10283 step = gfc_copy_expr (var->iter.step);
10285 if (gfc_simplify_expr (start, 1) == FAILURE
10286 || start->expr_type != EXPR_CONSTANT)
10288 gfc_error ("iterator start at %L does not simplify", &start->where);
10292 if (gfc_simplify_expr (end, 1) == FAILURE
10293 || end->expr_type != EXPR_CONSTANT)
10295 gfc_error ("iterator end at %L does not simplify", &end->where);
10299 if (gfc_simplify_expr (step, 1) == FAILURE
10300 || step->expr_type != EXPR_CONSTANT)
10302 gfc_error ("iterator step at %L does not simplify", &step->where);
10307 mpz_init_set (trip, end->value.integer);
10308 mpz_sub (trip, trip, start->value.integer);
10309 mpz_add (trip, trip, step->value.integer);
10311 mpz_div (trip, trip, step->value.integer);
10313 mpz_set (frame.value, start->value.integer);
10315 frame.prev = iter_stack;
10316 frame.variable = var->iter.var->symtree;
10317 iter_stack = &frame;
10319 while (mpz_cmp_ui (trip, 0) > 0)
10321 if (traverse_data_var (var->list, where) == FAILURE)
10328 e = gfc_copy_expr (var->expr);
10329 if (gfc_simplify_expr (e, 1) == FAILURE)
10337 mpz_add (frame.value, frame.value, step->value.integer);
10339 mpz_sub_ui (trip, trip, 1);
10344 mpz_clear (frame.value);
10346 gfc_free_expr (start);
10347 gfc_free_expr (end);
10348 gfc_free_expr (step);
10350 iter_stack = frame.prev;
10355 /* Type resolve variables in the variable list of a DATA statement. */
10358 traverse_data_var (gfc_data_variable *var, locus *where)
10362 for (; var; var = var->next)
10364 if (var->expr == NULL)
10365 t = traverse_data_list (var, where);
10367 t = check_data_variable (var, where);
10377 /* Resolve the expressions and iterators associated with a data statement.
10378 This is separate from the assignment checking because data lists should
10379 only be resolved once. */
10382 resolve_data_variables (gfc_data_variable *d)
10384 for (; d; d = d->next)
10386 if (d->list == NULL)
10388 if (gfc_resolve_expr (d->expr) == FAILURE)
10393 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
10396 if (resolve_data_variables (d->list) == FAILURE)
10405 /* Resolve a single DATA statement. We implement this by storing a pointer to
10406 the value list into static variables, and then recursively traversing the
10407 variables list, expanding iterators and such. */
10410 resolve_data (gfc_data *d)
10413 if (resolve_data_variables (d->var) == FAILURE)
10416 values.vnode = d->value;
10417 if (d->value == NULL)
10418 mpz_set_ui (values.left, 0);
10420 mpz_set (values.left, d->value->repeat);
10422 if (traverse_data_var (d->var, &d->where) == FAILURE)
10425 /* At this point, we better not have any values left. */
10427 if (next_data_value () == SUCCESS)
10428 gfc_error ("DATA statement at %L has more values than variables",
10433 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
10434 accessed by host or use association, is a dummy argument to a pure function,
10435 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
10436 is storage associated with any such variable, shall not be used in the
10437 following contexts: (clients of this function). */
10439 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
10440 procedure. Returns zero if assignment is OK, nonzero if there is a
10443 gfc_impure_variable (gfc_symbol *sym)
10447 if (sym->attr.use_assoc || sym->attr.in_common)
10450 if (sym->ns != gfc_current_ns)
10451 return !sym->attr.function;
10453 proc = sym->ns->proc_name;
10454 if (sym->attr.dummy && gfc_pure (proc)
10455 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
10457 proc->attr.function))
10460 /* TODO: Sort out what can be storage associated, if anything, and include
10461 it here. In principle equivalences should be scanned but it does not
10462 seem to be possible to storage associate an impure variable this way. */
10467 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
10468 symbol of the current procedure. */
10471 gfc_pure (gfc_symbol *sym)
10473 symbol_attribute attr;
10476 sym = gfc_current_ns->proc_name;
10482 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
10486 /* Test whether the current procedure is elemental or not. */
10489 gfc_elemental (gfc_symbol *sym)
10491 symbol_attribute attr;
10494 sym = gfc_current_ns->proc_name;
10499 return attr.flavor == FL_PROCEDURE && attr.elemental;
10503 /* Warn about unused labels. */
10506 warn_unused_fortran_label (gfc_st_label *label)
10511 warn_unused_fortran_label (label->left);
10513 if (label->defined == ST_LABEL_UNKNOWN)
10516 switch (label->referenced)
10518 case ST_LABEL_UNKNOWN:
10519 gfc_warning ("Label %d at %L defined but not used", label->value,
10523 case ST_LABEL_BAD_TARGET:
10524 gfc_warning ("Label %d at %L defined but cannot be used",
10525 label->value, &label->where);
10532 warn_unused_fortran_label (label->right);
10536 /* Returns the sequence type of a symbol or sequence. */
10539 sequence_type (gfc_typespec ts)
10548 if (ts.derived->components == NULL)
10549 return SEQ_NONDEFAULT;
10551 result = sequence_type (ts.derived->components->ts);
10552 for (c = ts.derived->components->next; c; c = c->next)
10553 if (sequence_type (c->ts) != result)
10559 if (ts.kind != gfc_default_character_kind)
10560 return SEQ_NONDEFAULT;
10562 return SEQ_CHARACTER;
10565 if (ts.kind != gfc_default_integer_kind)
10566 return SEQ_NONDEFAULT;
10568 return SEQ_NUMERIC;
10571 if (!(ts.kind == gfc_default_real_kind
10572 || ts.kind == gfc_default_double_kind))
10573 return SEQ_NONDEFAULT;
10575 return SEQ_NUMERIC;
10578 if (ts.kind != gfc_default_complex_kind)
10579 return SEQ_NONDEFAULT;
10581 return SEQ_NUMERIC;
10584 if (ts.kind != gfc_default_logical_kind)
10585 return SEQ_NONDEFAULT;
10587 return SEQ_NUMERIC;
10590 return SEQ_NONDEFAULT;
10595 /* Resolve derived type EQUIVALENCE object. */
10598 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
10601 gfc_component *c = derived->components;
10606 /* Shall not be an object of nonsequence derived type. */
10607 if (!derived->attr.sequence)
10609 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
10610 "attribute to be an EQUIVALENCE object", sym->name,
10615 /* Shall not have allocatable components. */
10616 if (derived->attr.alloc_comp)
10618 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
10619 "components to be an EQUIVALENCE object",sym->name,
10624 if (sym->attr.in_common && has_default_initializer (sym->ts.derived))
10626 gfc_error ("Derived type variable '%s' at %L with default "
10627 "initialization cannot be in EQUIVALENCE with a variable "
10628 "in COMMON", sym->name, &e->where);
10632 for (; c ; c = c->next)
10636 && (resolve_equivalence_derived (c->ts.derived, sym, e) == FAILURE))
10639 /* Shall not be an object of sequence derived type containing a pointer
10640 in the structure. */
10641 if (c->attr.pointer)
10643 gfc_error ("Derived type variable '%s' at %L with pointer "
10644 "component(s) cannot be an EQUIVALENCE object",
10645 sym->name, &e->where);
10653 /* Resolve equivalence object.
10654 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
10655 an allocatable array, an object of nonsequence derived type, an object of
10656 sequence derived type containing a pointer at any level of component
10657 selection, an automatic object, a function name, an entry name, a result
10658 name, a named constant, a structure component, or a subobject of any of
10659 the preceding objects. A substring shall not have length zero. A
10660 derived type shall not have components with default initialization nor
10661 shall two objects of an equivalence group be initialized.
10662 Either all or none of the objects shall have an protected attribute.
10663 The simple constraints are done in symbol.c(check_conflict) and the rest
10664 are implemented here. */
10667 resolve_equivalence (gfc_equiv *eq)
10670 gfc_symbol *derived;
10671 gfc_symbol *first_sym;
10674 locus *last_where = NULL;
10675 seq_type eq_type, last_eq_type;
10676 gfc_typespec *last_ts;
10677 int object, cnt_protected;
10678 const char *value_name;
10682 last_ts = &eq->expr->symtree->n.sym->ts;
10684 first_sym = eq->expr->symtree->n.sym;
10688 for (object = 1; eq; eq = eq->eq, object++)
10692 e->ts = e->symtree->n.sym->ts;
10693 /* match_varspec might not know yet if it is seeing
10694 array reference or substring reference, as it doesn't
10696 if (e->ref && e->ref->type == REF_ARRAY)
10698 gfc_ref *ref = e->ref;
10699 sym = e->symtree->n.sym;
10701 if (sym->attr.dimension)
10703 ref->u.ar.as = sym->as;
10707 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
10708 if (e->ts.type == BT_CHARACTER
10710 && ref->type == REF_ARRAY
10711 && ref->u.ar.dimen == 1
10712 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
10713 && ref->u.ar.stride[0] == NULL)
10715 gfc_expr *start = ref->u.ar.start[0];
10716 gfc_expr *end = ref->u.ar.end[0];
10719 /* Optimize away the (:) reference. */
10720 if (start == NULL && end == NULL)
10723 e->ref = ref->next;
10725 e->ref->next = ref->next;
10730 ref->type = REF_SUBSTRING;
10732 start = gfc_int_expr (1);
10733 ref->u.ss.start = start;
10734 if (end == NULL && e->ts.cl)
10735 end = gfc_copy_expr (e->ts.cl->length);
10736 ref->u.ss.end = end;
10737 ref->u.ss.length = e->ts.cl;
10744 /* Any further ref is an error. */
10747 gcc_assert (ref->type == REF_ARRAY);
10748 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
10754 if (gfc_resolve_expr (e) == FAILURE)
10757 sym = e->symtree->n.sym;
10759 if (sym->attr.is_protected)
10761 if (cnt_protected > 0 && cnt_protected != object)
10763 gfc_error ("Either all or none of the objects in the "
10764 "EQUIVALENCE set at %L shall have the "
10765 "PROTECTED attribute",
10770 /* Shall not equivalence common block variables in a PURE procedure. */
10771 if (sym->ns->proc_name
10772 && sym->ns->proc_name->attr.pure
10773 && sym->attr.in_common)
10775 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
10776 "object in the pure procedure '%s'",
10777 sym->name, &e->where, sym->ns->proc_name->name);
10781 /* Shall not be a named constant. */
10782 if (e->expr_type == EXPR_CONSTANT)
10784 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
10785 "object", sym->name, &e->where);
10789 derived = e->ts.derived;
10790 if (derived && resolve_equivalence_derived (derived, sym, e) == FAILURE)
10793 /* Check that the types correspond correctly:
10795 A numeric sequence structure may be equivalenced to another sequence
10796 structure, an object of default integer type, default real type, double
10797 precision real type, default logical type such that components of the
10798 structure ultimately only become associated to objects of the same
10799 kind. A character sequence structure may be equivalenced to an object
10800 of default character kind or another character sequence structure.
10801 Other objects may be equivalenced only to objects of the same type and
10802 kind parameters. */
10804 /* Identical types are unconditionally OK. */
10805 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
10806 goto identical_types;
10808 last_eq_type = sequence_type (*last_ts);
10809 eq_type = sequence_type (sym->ts);
10811 /* Since the pair of objects is not of the same type, mixed or
10812 non-default sequences can be rejected. */
10814 msg = "Sequence %s with mixed components in EQUIVALENCE "
10815 "statement at %L with different type objects";
10817 && last_eq_type == SEQ_MIXED
10818 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
10820 || (eq_type == SEQ_MIXED
10821 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10822 &e->where) == FAILURE))
10825 msg = "Non-default type object or sequence %s in EQUIVALENCE "
10826 "statement at %L with objects of different type";
10828 && last_eq_type == SEQ_NONDEFAULT
10829 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
10830 last_where) == FAILURE)
10831 || (eq_type == SEQ_NONDEFAULT
10832 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10833 &e->where) == FAILURE))
10836 msg ="Non-CHARACTER object '%s' in default CHARACTER "
10837 "EQUIVALENCE statement at %L";
10838 if (last_eq_type == SEQ_CHARACTER
10839 && eq_type != SEQ_CHARACTER
10840 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10841 &e->where) == FAILURE)
10844 msg ="Non-NUMERIC object '%s' in default NUMERIC "
10845 "EQUIVALENCE statement at %L";
10846 if (last_eq_type == SEQ_NUMERIC
10847 && eq_type != SEQ_NUMERIC
10848 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10849 &e->where) == FAILURE)
10854 last_where = &e->where;
10859 /* Shall not be an automatic array. */
10860 if (e->ref->type == REF_ARRAY
10861 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
10863 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
10864 "an EQUIVALENCE object", sym->name, &e->where);
10871 /* Shall not be a structure component. */
10872 if (r->type == REF_COMPONENT)
10874 gfc_error ("Structure component '%s' at %L cannot be an "
10875 "EQUIVALENCE object",
10876 r->u.c.component->name, &e->where);
10880 /* A substring shall not have length zero. */
10881 if (r->type == REF_SUBSTRING)
10883 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
10885 gfc_error ("Substring at %L has length zero",
10886 &r->u.ss.start->where);
10896 /* Resolve function and ENTRY types, issue diagnostics if needed. */
10899 resolve_fntype (gfc_namespace *ns)
10901 gfc_entry_list *el;
10904 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
10907 /* If there are any entries, ns->proc_name is the entry master
10908 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
10910 sym = ns->entries->sym;
10912 sym = ns->proc_name;
10913 if (sym->result == sym
10914 && sym->ts.type == BT_UNKNOWN
10915 && gfc_set_default_type (sym, 0, NULL) == FAILURE
10916 && !sym->attr.untyped)
10918 gfc_error ("Function '%s' at %L has no IMPLICIT type",
10919 sym->name, &sym->declared_at);
10920 sym->attr.untyped = 1;
10923 if (sym->ts.type == BT_DERIVED && !sym->ts.derived->attr.use_assoc
10924 && !sym->attr.contained
10925 && !gfc_check_access (sym->ts.derived->attr.access,
10926 sym->ts.derived->ns->default_access)
10927 && gfc_check_access (sym->attr.access, sym->ns->default_access))
10929 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
10930 "%L of PRIVATE type '%s'", sym->name,
10931 &sym->declared_at, sym->ts.derived->name);
10935 for (el = ns->entries->next; el; el = el->next)
10937 if (el->sym->result == el->sym
10938 && el->sym->ts.type == BT_UNKNOWN
10939 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
10940 && !el->sym->attr.untyped)
10942 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
10943 el->sym->name, &el->sym->declared_at);
10944 el->sym->attr.untyped = 1;
10949 /* 12.3.2.1.1 Defined operators. */
10952 gfc_resolve_uops (gfc_symtree *symtree)
10954 gfc_interface *itr;
10956 gfc_formal_arglist *formal;
10958 if (symtree == NULL)
10961 gfc_resolve_uops (symtree->left);
10962 gfc_resolve_uops (symtree->right);
10964 for (itr = symtree->n.uop->op; itr; itr = itr->next)
10967 if (!sym->attr.function)
10968 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
10969 sym->name, &sym->declared_at);
10971 if (sym->ts.type == BT_CHARACTER
10972 && !(sym->ts.cl && sym->ts.cl->length)
10973 && !(sym->result && sym->result->ts.cl
10974 && sym->result->ts.cl->length))
10975 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
10976 "character length", sym->name, &sym->declared_at);
10978 formal = sym->formal;
10979 if (!formal || !formal->sym)
10981 gfc_error ("User operator procedure '%s' at %L must have at least "
10982 "one argument", sym->name, &sym->declared_at);
10986 if (formal->sym->attr.intent != INTENT_IN)
10987 gfc_error ("First argument of operator interface at %L must be "
10988 "INTENT(IN)", &sym->declared_at);
10990 if (formal->sym->attr.optional)
10991 gfc_error ("First argument of operator interface at %L cannot be "
10992 "optional", &sym->declared_at);
10994 formal = formal->next;
10995 if (!formal || !formal->sym)
10998 if (formal->sym->attr.intent != INTENT_IN)
10999 gfc_error ("Second argument of operator interface at %L must be "
11000 "INTENT(IN)", &sym->declared_at);
11002 if (formal->sym->attr.optional)
11003 gfc_error ("Second argument of operator interface at %L cannot be "
11004 "optional", &sym->declared_at);
11007 gfc_error ("Operator interface at %L must have, at most, two "
11008 "arguments", &sym->declared_at);
11013 /* Examine all of the expressions associated with a program unit,
11014 assign types to all intermediate expressions, make sure that all
11015 assignments are to compatible types and figure out which names
11016 refer to which functions or subroutines. It doesn't check code
11017 block, which is handled by resolve_code. */
11020 resolve_types (gfc_namespace *ns)
11026 gfc_namespace* old_ns = gfc_current_ns;
11028 /* Check that all IMPLICIT types are ok. */
11029 if (!ns->seen_implicit_none)
11032 for (letter = 0; letter != GFC_LETTERS; ++letter)
11033 if (ns->set_flag[letter]
11034 && resolve_typespec_used (&ns->default_type[letter],
11035 &ns->implicit_loc[letter],
11040 gfc_current_ns = ns;
11042 resolve_entries (ns);
11044 resolve_common_vars (ns->blank_common.head, false);
11045 resolve_common_blocks (ns->common_root);
11047 resolve_contained_functions (ns);
11049 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
11051 for (cl = ns->cl_list; cl; cl = cl->next)
11052 resolve_charlen (cl);
11054 gfc_traverse_ns (ns, resolve_symbol);
11056 resolve_fntype (ns);
11058 for (n = ns->contained; n; n = n->sibling)
11060 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
11061 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
11062 "also be PURE", n->proc_name->name,
11063 &n->proc_name->declared_at);
11069 gfc_check_interfaces (ns);
11071 gfc_traverse_ns (ns, resolve_values);
11077 for (d = ns->data; d; d = d->next)
11081 gfc_traverse_ns (ns, gfc_formalize_init_value);
11083 gfc_traverse_ns (ns, gfc_verify_binding_labels);
11085 if (ns->common_root != NULL)
11086 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
11088 for (eq = ns->equiv; eq; eq = eq->next)
11089 resolve_equivalence (eq);
11091 /* Warn about unused labels. */
11092 if (warn_unused_label)
11093 warn_unused_fortran_label (ns->st_labels);
11095 gfc_resolve_uops (ns->uop_root);
11097 gfc_current_ns = old_ns;
11101 /* Call resolve_code recursively. */
11104 resolve_codes (gfc_namespace *ns)
11107 bitmap_obstack old_obstack;
11109 for (n = ns->contained; n; n = n->sibling)
11112 gfc_current_ns = ns;
11114 /* Set to an out of range value. */
11115 current_entry_id = -1;
11117 old_obstack = labels_obstack;
11118 bitmap_obstack_initialize (&labels_obstack);
11120 resolve_code (ns->code, ns);
11122 bitmap_obstack_release (&labels_obstack);
11123 labels_obstack = old_obstack;
11127 /* This function is called after a complete program unit has been compiled.
11128 Its purpose is to examine all of the expressions associated with a program
11129 unit, assign types to all intermediate expressions, make sure that all
11130 assignments are to compatible types and figure out which names refer to
11131 which functions or subroutines. */
11134 gfc_resolve (gfc_namespace *ns)
11136 gfc_namespace *old_ns;
11141 old_ns = gfc_current_ns;
11143 resolve_types (ns);
11144 resolve_codes (ns);
11146 gfc_current_ns = old_ns;