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->u.derived->attr.abstract)
111 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
112 name, where, ts->u.derived->name);
114 gfc_error ("ABSTRACT type '%s' used at %L",
115 ts->u.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.u.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.u.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->u.cl && fts->u.cl
556 && (((ts->u.cl->length && !fts->u.cl->length)
557 ||(!ts->u.cl->length && fts->u.cl->length))
559 && ts->u.cl->length->expr_type
560 != fts->u.cl->length->expr_type)
562 && ts->u.cl->length->expr_type == EXPR_CONSTANT
563 && mpz_cmp (ts->u.cl->length->value.integer,
564 fts->u.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.u.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.u.derived->attr.sequence
722 || csym->ts.u.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.u.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.u.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.u.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.type == BT_DERIVED && expr->ts.u.derived
834 && expr->ts.u.derived->ts.is_iso_c && cons && cons->expr != NULL)
836 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
837 expr->ts.u.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;
1157 /* We already know this one is an intrinsic, so we don't call
1158 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1159 gfc_find_subroutine directly to check whether it is a function or
1162 if ((isym = gfc_find_function (sym->name)))
1164 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1165 && !sym->attr.implicit_type)
1166 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1167 " ignored", sym->name, &sym->declared_at);
1169 if (!sym->attr.function &&
1170 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1175 else if ((isym = gfc_find_subroutine (sym->name)))
1177 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1179 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1180 " specifier", sym->name, &sym->declared_at);
1184 if (!sym->attr.subroutine &&
1185 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1190 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1195 gfc_copy_formal_args_intr (sym, isym);
1197 /* Check it is actually available in the standard settings. */
1198 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1201 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1202 " available in the current standard settings but %s. Use"
1203 " an appropriate -std=* option or enable -fall-intrinsics"
1204 " in order to use it.",
1205 sym->name, &sym->declared_at, symstd);
1213 /* Resolve a procedure expression, like passing it to a called procedure or as
1214 RHS for a procedure pointer assignment. */
1217 resolve_procedure_expression (gfc_expr* expr)
1221 if (expr->expr_type != EXPR_VARIABLE)
1223 gcc_assert (expr->symtree);
1225 sym = expr->symtree->n.sym;
1227 if (sym->attr.intrinsic)
1228 resolve_intrinsic (sym, &expr->where);
1230 if (sym->attr.flavor != FL_PROCEDURE
1231 || (sym->attr.function && sym->result == sym))
1234 /* A non-RECURSIVE procedure that is used as procedure expression within its
1235 own body is in danger of being called recursively. */
1236 if (is_illegal_recursion (sym, gfc_current_ns))
1237 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1238 " itself recursively. Declare it RECURSIVE or use"
1239 " -frecursive", sym->name, &expr->where);
1245 /* Resolve an actual argument list. Most of the time, this is just
1246 resolving the expressions in the list.
1247 The exception is that we sometimes have to decide whether arguments
1248 that look like procedure arguments are really simple variable
1252 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1253 bool no_formal_args)
1256 gfc_symtree *parent_st;
1258 int save_need_full_assumed_size;
1259 gfc_component *comp;
1261 for (; arg; arg = arg->next)
1266 /* Check the label is a valid branching target. */
1269 if (arg->label->defined == ST_LABEL_UNKNOWN)
1271 gfc_error ("Label %d referenced at %L is never defined",
1272 arg->label->value, &arg->label->where);
1279 if (gfc_is_proc_ptr_comp (e, &comp))
1282 if (e->expr_type == EXPR_PPC)
1284 if (comp->as != NULL)
1285 e->rank = comp->as->rank;
1286 e->expr_type = EXPR_FUNCTION;
1291 if (e->expr_type == EXPR_VARIABLE
1292 && e->symtree->n.sym->attr.generic
1294 && count_specific_procs (e) != 1)
1297 if (e->ts.type != BT_PROCEDURE)
1299 save_need_full_assumed_size = need_full_assumed_size;
1300 if (e->expr_type != EXPR_VARIABLE)
1301 need_full_assumed_size = 0;
1302 if (gfc_resolve_expr (e) != SUCCESS)
1304 need_full_assumed_size = save_need_full_assumed_size;
1308 /* See if the expression node should really be a variable reference. */
1310 sym = e->symtree->n.sym;
1312 if (sym->attr.flavor == FL_PROCEDURE
1313 || sym->attr.intrinsic
1314 || sym->attr.external)
1318 /* If a procedure is not already determined to be something else
1319 check if it is intrinsic. */
1320 if (!sym->attr.intrinsic
1321 && !(sym->attr.external || sym->attr.use_assoc
1322 || sym->attr.if_source == IFSRC_IFBODY)
1323 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1324 sym->attr.intrinsic = 1;
1326 if (sym->attr.proc == PROC_ST_FUNCTION)
1328 gfc_error ("Statement function '%s' at %L is not allowed as an "
1329 "actual argument", sym->name, &e->where);
1332 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1333 sym->attr.subroutine);
1334 if (sym->attr.intrinsic && actual_ok == 0)
1336 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1337 "actual argument", sym->name, &e->where);
1340 if (sym->attr.contained && !sym->attr.use_assoc
1341 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1343 gfc_error ("Internal procedure '%s' is not allowed as an "
1344 "actual argument at %L", sym->name, &e->where);
1347 if (sym->attr.elemental && !sym->attr.intrinsic)
1349 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1350 "allowed as an actual argument at %L", sym->name,
1354 /* Check if a generic interface has a specific procedure
1355 with the same name before emitting an error. */
1356 if (sym->attr.generic && count_specific_procs (e) != 1)
1359 /* Just in case a specific was found for the expression. */
1360 sym = e->symtree->n.sym;
1362 /* If the symbol is the function that names the current (or
1363 parent) scope, then we really have a variable reference. */
1365 if (sym->attr.function && sym->result == sym
1366 && (sym->ns->proc_name == sym
1367 || (sym->ns->parent != NULL
1368 && sym->ns->parent->proc_name == sym)))
1371 /* If all else fails, see if we have a specific intrinsic. */
1372 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1374 gfc_intrinsic_sym *isym;
1376 isym = gfc_find_function (sym->name);
1377 if (isym == NULL || !isym->specific)
1379 gfc_error ("Unable to find a specific INTRINSIC procedure "
1380 "for the reference '%s' at %L", sym->name,
1385 sym->attr.intrinsic = 1;
1386 sym->attr.function = 1;
1389 if (gfc_resolve_expr (e) == FAILURE)
1394 /* See if the name is a module procedure in a parent unit. */
1396 if (was_declared (sym) || sym->ns->parent == NULL)
1399 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1401 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1405 if (parent_st == NULL)
1408 sym = parent_st->n.sym;
1409 e->symtree = parent_st; /* Point to the right thing. */
1411 if (sym->attr.flavor == FL_PROCEDURE
1412 || sym->attr.intrinsic
1413 || sym->attr.external)
1415 if (gfc_resolve_expr (e) == FAILURE)
1421 e->expr_type = EXPR_VARIABLE;
1423 if (sym->as != NULL)
1425 e->rank = sym->as->rank;
1426 e->ref = gfc_get_ref ();
1427 e->ref->type = REF_ARRAY;
1428 e->ref->u.ar.type = AR_FULL;
1429 e->ref->u.ar.as = sym->as;
1432 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1433 primary.c (match_actual_arg). If above code determines that it
1434 is a variable instead, it needs to be resolved as it was not
1435 done at the beginning of this function. */
1436 save_need_full_assumed_size = need_full_assumed_size;
1437 if (e->expr_type != EXPR_VARIABLE)
1438 need_full_assumed_size = 0;
1439 if (gfc_resolve_expr (e) != SUCCESS)
1441 need_full_assumed_size = save_need_full_assumed_size;
1444 /* Check argument list functions %VAL, %LOC and %REF. There is
1445 nothing to do for %REF. */
1446 if (arg->name && arg->name[0] == '%')
1448 if (strncmp ("%VAL", arg->name, 4) == 0)
1450 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1452 gfc_error ("By-value argument at %L is not of numeric "
1459 gfc_error ("By-value argument at %L cannot be an array or "
1460 "an array section", &e->where);
1464 /* Intrinsics are still PROC_UNKNOWN here. However,
1465 since same file external procedures are not resolvable
1466 in gfortran, it is a good deal easier to leave them to
1468 if (ptype != PROC_UNKNOWN
1469 && ptype != PROC_DUMMY
1470 && ptype != PROC_EXTERNAL
1471 && ptype != PROC_MODULE)
1473 gfc_error ("By-value argument at %L is not allowed "
1474 "in this context", &e->where);
1479 /* Statement functions have already been excluded above. */
1480 else if (strncmp ("%LOC", arg->name, 4) == 0
1481 && e->ts.type == BT_PROCEDURE)
1483 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1485 gfc_error ("Passing internal procedure at %L by location "
1486 "not allowed", &e->where);
1497 /* Do the checks of the actual argument list that are specific to elemental
1498 procedures. If called with c == NULL, we have a function, otherwise if
1499 expr == NULL, we have a subroutine. */
1502 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1504 gfc_actual_arglist *arg0;
1505 gfc_actual_arglist *arg;
1506 gfc_symbol *esym = NULL;
1507 gfc_intrinsic_sym *isym = NULL;
1509 gfc_intrinsic_arg *iformal = NULL;
1510 gfc_formal_arglist *eformal = NULL;
1511 bool formal_optional = false;
1512 bool set_by_optional = false;
1516 /* Is this an elemental procedure? */
1517 if (expr && expr->value.function.actual != NULL)
1519 if (expr->value.function.esym != NULL
1520 && expr->value.function.esym->attr.elemental)
1522 arg0 = expr->value.function.actual;
1523 esym = expr->value.function.esym;
1525 else if (expr->value.function.isym != NULL
1526 && expr->value.function.isym->elemental)
1528 arg0 = expr->value.function.actual;
1529 isym = expr->value.function.isym;
1534 else if (c && c->ext.actual != NULL)
1536 arg0 = c->ext.actual;
1538 if (c->resolved_sym)
1539 esym = c->resolved_sym;
1541 esym = c->symtree->n.sym;
1544 if (!esym->attr.elemental)
1550 /* The rank of an elemental is the rank of its array argument(s). */
1551 for (arg = arg0; arg; arg = arg->next)
1553 if (arg->expr != NULL && arg->expr->rank > 0)
1555 rank = arg->expr->rank;
1556 if (arg->expr->expr_type == EXPR_VARIABLE
1557 && arg->expr->symtree->n.sym->attr.optional)
1558 set_by_optional = true;
1560 /* Function specific; set the result rank and shape. */
1564 if (!expr->shape && arg->expr->shape)
1566 expr->shape = gfc_get_shape (rank);
1567 for (i = 0; i < rank; i++)
1568 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1575 /* If it is an array, it shall not be supplied as an actual argument
1576 to an elemental procedure unless an array of the same rank is supplied
1577 as an actual argument corresponding to a nonoptional dummy argument of
1578 that elemental procedure(12.4.1.5). */
1579 formal_optional = false;
1581 iformal = isym->formal;
1583 eformal = esym->formal;
1585 for (arg = arg0; arg; arg = arg->next)
1589 if (eformal->sym && eformal->sym->attr.optional)
1590 formal_optional = true;
1591 eformal = eformal->next;
1593 else if (isym && iformal)
1595 if (iformal->optional)
1596 formal_optional = true;
1597 iformal = iformal->next;
1600 formal_optional = true;
1602 if (pedantic && arg->expr != NULL
1603 && arg->expr->expr_type == EXPR_VARIABLE
1604 && arg->expr->symtree->n.sym->attr.optional
1607 && (set_by_optional || arg->expr->rank != rank)
1608 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1610 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1611 "MISSING, it cannot be the actual argument of an "
1612 "ELEMENTAL procedure unless there is a non-optional "
1613 "argument with the same rank (12.4.1.5)",
1614 arg->expr->symtree->n.sym->name, &arg->expr->where);
1619 for (arg = arg0; arg; arg = arg->next)
1621 if (arg->expr == NULL || arg->expr->rank == 0)
1624 /* Being elemental, the last upper bound of an assumed size array
1625 argument must be present. */
1626 if (resolve_assumed_size_actual (arg->expr))
1629 /* Elemental procedure's array actual arguments must conform. */
1632 if (gfc_check_conformance (arg->expr, e,
1633 "elemental procedure") == FAILURE)
1640 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1641 is an array, the intent inout/out variable needs to be also an array. */
1642 if (rank > 0 && esym && expr == NULL)
1643 for (eformal = esym->formal, arg = arg0; arg && eformal;
1644 arg = arg->next, eformal = eformal->next)
1645 if ((eformal->sym->attr.intent == INTENT_OUT
1646 || eformal->sym->attr.intent == INTENT_INOUT)
1647 && arg->expr && arg->expr->rank == 0)
1649 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1650 "ELEMENTAL subroutine '%s' is a scalar, but another "
1651 "actual argument is an array", &arg->expr->where,
1652 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1653 : "INOUT", eformal->sym->name, esym->name);
1660 /* Go through each actual argument in ACTUAL and see if it can be
1661 implemented as an inlined, non-copying intrinsic. FNSYM is the
1662 function being called, or NULL if not known. */
1665 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1667 gfc_actual_arglist *ap;
1670 for (ap = actual; ap; ap = ap->next)
1672 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1673 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1675 ap->expr->inline_noncopying_intrinsic = 1;
1679 /* This function does the checking of references to global procedures
1680 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1681 77 and 95 standards. It checks for a gsymbol for the name, making
1682 one if it does not already exist. If it already exists, then the
1683 reference being resolved must correspond to the type of gsymbol.
1684 Otherwise, the new symbol is equipped with the attributes of the
1685 reference. The corresponding code that is called in creating
1686 global entities is parse.c.
1688 In addition, for all but -std=legacy, the gsymbols are used to
1689 check the interfaces of external procedures from the same file.
1690 The namespace of the gsymbol is resolved and then, once this is
1691 done the interface is checked. */
1695 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1697 if (!gsym_ns->proc_name->attr.recursive)
1700 if (sym->ns == gsym_ns)
1703 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1710 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1712 if (gsym_ns->entries)
1714 gfc_entry_list *entry = gsym_ns->entries;
1716 for (; entry; entry = entry->next)
1718 if (strcmp (sym->name, entry->sym->name) == 0)
1720 if (strcmp (gsym_ns->proc_name->name,
1721 sym->ns->proc_name->name) == 0)
1725 && strcmp (gsym_ns->proc_name->name,
1726 sym->ns->parent->proc_name->name) == 0)
1735 resolve_global_procedure (gfc_symbol *sym, locus *where,
1736 gfc_actual_arglist **actual, int sub)
1740 enum gfc_symbol_type type;
1742 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1744 gsym = gfc_get_gsymbol (sym->name);
1746 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1747 gfc_global_used (gsym, where);
1749 if (gfc_option.flag_whole_file
1750 && sym->attr.if_source == IFSRC_UNKNOWN
1751 && gsym->type != GSYM_UNKNOWN
1753 && gsym->ns->resolved != -1
1754 && gsym->ns->proc_name
1755 && not_in_recursive (sym, gsym->ns)
1756 && not_entry_self_reference (sym, gsym->ns))
1758 /* Make sure that translation for the gsymbol occurs before
1759 the procedure currently being resolved. */
1760 ns = gsym->ns->resolved ? NULL : gfc_global_ns_list;
1761 for (; ns && ns != gsym->ns; ns = ns->sibling)
1763 if (ns->sibling == gsym->ns)
1765 ns->sibling = gsym->ns->sibling;
1766 gsym->ns->sibling = gfc_global_ns_list;
1767 gfc_global_ns_list = gsym->ns;
1772 if (!gsym->ns->resolved)
1774 gfc_dt_list *old_dt_list;
1776 /* Stash away derived types so that the backend_decls do not
1778 old_dt_list = gfc_derived_types;
1779 gfc_derived_types = NULL;
1781 gfc_resolve (gsym->ns);
1783 /* Store the new derived types with the global namespace. */
1784 if (gfc_derived_types)
1785 gsym->ns->derived_types = gfc_derived_types;
1787 /* Restore the derived types of this namespace. */
1788 gfc_derived_types = old_dt_list;
1791 if (gsym->ns->proc_name->attr.function
1792 && gsym->ns->proc_name->as
1793 && gsym->ns->proc_name->as->rank
1794 && (!sym->as || sym->as->rank != gsym->ns->proc_name->as->rank))
1795 gfc_error ("The reference to function '%s' at %L either needs an "
1796 "explicit INTERFACE or the rank is incorrect", sym->name,
1799 if (gfc_option.flag_whole_file == 1
1800 || ((gfc_option.warn_std & GFC_STD_LEGACY)
1802 !(gfc_option.warn_std & GFC_STD_GNU)))
1803 gfc_errors_to_warnings (1);
1805 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1807 gfc_errors_to_warnings (0);
1810 if (gsym->type == GSYM_UNKNOWN)
1813 gsym->where = *where;
1820 /************* Function resolution *************/
1822 /* Resolve a function call known to be generic.
1823 Section 14.1.2.4.1. */
1826 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1830 if (sym->attr.generic)
1832 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1835 expr->value.function.name = s->name;
1836 expr->value.function.esym = s;
1838 if (s->ts.type != BT_UNKNOWN)
1840 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1841 expr->ts = s->result->ts;
1844 expr->rank = s->as->rank;
1845 else if (s->result != NULL && s->result->as != NULL)
1846 expr->rank = s->result->as->rank;
1848 gfc_set_sym_referenced (expr->value.function.esym);
1853 /* TODO: Need to search for elemental references in generic
1857 if (sym->attr.intrinsic)
1858 return gfc_intrinsic_func_interface (expr, 0);
1865 resolve_generic_f (gfc_expr *expr)
1870 sym = expr->symtree->n.sym;
1874 m = resolve_generic_f0 (expr, sym);
1877 else if (m == MATCH_ERROR)
1881 if (sym->ns->parent == NULL)
1883 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1887 if (!generic_sym (sym))
1891 /* Last ditch attempt. See if the reference is to an intrinsic
1892 that possesses a matching interface. 14.1.2.4 */
1893 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
1895 gfc_error ("There is no specific function for the generic '%s' at %L",
1896 expr->symtree->n.sym->name, &expr->where);
1900 m = gfc_intrinsic_func_interface (expr, 0);
1904 gfc_error ("Generic function '%s' at %L is not consistent with a "
1905 "specific intrinsic interface", expr->symtree->n.sym->name,
1912 /* Resolve a function call known to be specific. */
1915 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
1919 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
1921 if (sym->attr.dummy)
1923 sym->attr.proc = PROC_DUMMY;
1927 sym->attr.proc = PROC_EXTERNAL;
1931 if (sym->attr.proc == PROC_MODULE
1932 || sym->attr.proc == PROC_ST_FUNCTION
1933 || sym->attr.proc == PROC_INTERNAL)
1936 if (sym->attr.intrinsic)
1938 m = gfc_intrinsic_func_interface (expr, 1);
1942 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
1943 "with an intrinsic", sym->name, &expr->where);
1951 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1954 expr->ts = sym->result->ts;
1957 expr->value.function.name = sym->name;
1958 expr->value.function.esym = sym;
1959 if (sym->as != NULL)
1960 expr->rank = sym->as->rank;
1967 resolve_specific_f (gfc_expr *expr)
1972 sym = expr->symtree->n.sym;
1976 m = resolve_specific_f0 (sym, expr);
1979 if (m == MATCH_ERROR)
1982 if (sym->ns->parent == NULL)
1985 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1991 gfc_error ("Unable to resolve the specific function '%s' at %L",
1992 expr->symtree->n.sym->name, &expr->where);
1998 /* Resolve a procedure call not known to be generic nor specific. */
2001 resolve_unknown_f (gfc_expr *expr)
2006 sym = expr->symtree->n.sym;
2008 if (sym->attr.dummy)
2010 sym->attr.proc = PROC_DUMMY;
2011 expr->value.function.name = sym->name;
2015 /* See if we have an intrinsic function reference. */
2017 if (gfc_is_intrinsic (sym, 0, expr->where))
2019 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2024 /* The reference is to an external name. */
2026 sym->attr.proc = PROC_EXTERNAL;
2027 expr->value.function.name = sym->name;
2028 expr->value.function.esym = expr->symtree->n.sym;
2030 if (sym->as != NULL)
2031 expr->rank = sym->as->rank;
2033 /* Type of the expression is either the type of the symbol or the
2034 default type of the symbol. */
2037 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2039 if (sym->ts.type != BT_UNKNOWN)
2043 ts = gfc_get_default_type (sym->name, sym->ns);
2045 if (ts->type == BT_UNKNOWN)
2047 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2048 sym->name, &expr->where);
2059 /* Return true, if the symbol is an external procedure. */
2061 is_external_proc (gfc_symbol *sym)
2063 if (!sym->attr.dummy && !sym->attr.contained
2064 && !(sym->attr.intrinsic
2065 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2066 && sym->attr.proc != PROC_ST_FUNCTION
2067 && !sym->attr.use_assoc
2075 /* Figure out if a function reference is pure or not. Also set the name
2076 of the function for a potential error message. Return nonzero if the
2077 function is PURE, zero if not. */
2079 pure_stmt_function (gfc_expr *, gfc_symbol *);
2082 pure_function (gfc_expr *e, const char **name)
2088 if (e->symtree != NULL
2089 && e->symtree->n.sym != NULL
2090 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2091 return pure_stmt_function (e, e->symtree->n.sym);
2093 if (e->value.function.esym)
2095 pure = gfc_pure (e->value.function.esym);
2096 *name = e->value.function.esym->name;
2098 else if (e->value.function.isym)
2100 pure = e->value.function.isym->pure
2101 || e->value.function.isym->elemental;
2102 *name = e->value.function.isym->name;
2106 /* Implicit functions are not pure. */
2108 *name = e->value.function.name;
2116 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2117 int *f ATTRIBUTE_UNUSED)
2121 /* Don't bother recursing into other statement functions
2122 since they will be checked individually for purity. */
2123 if (e->expr_type != EXPR_FUNCTION
2125 || e->symtree->n.sym == sym
2126 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2129 return pure_function (e, &name) ? false : true;
2134 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2136 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2141 is_scalar_expr_ptr (gfc_expr *expr)
2143 gfc_try retval = SUCCESS;
2148 /* See if we have a gfc_ref, which means we have a substring, array
2149 reference, or a component. */
2150 if (expr->ref != NULL)
2153 while (ref->next != NULL)
2159 if (ref->u.ss.length != NULL
2160 && ref->u.ss.length->length != NULL
2162 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2164 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2166 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2167 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2168 if (end - start + 1 != 1)
2175 if (ref->u.ar.type == AR_ELEMENT)
2177 else if (ref->u.ar.type == AR_FULL)
2179 /* The user can give a full array if the array is of size 1. */
2180 if (ref->u.ar.as != NULL
2181 && ref->u.ar.as->rank == 1
2182 && ref->u.ar.as->type == AS_EXPLICIT
2183 && ref->u.ar.as->lower[0] != NULL
2184 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2185 && ref->u.ar.as->upper[0] != NULL
2186 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2188 /* If we have a character string, we need to check if
2189 its length is one. */
2190 if (expr->ts.type == BT_CHARACTER)
2192 if (expr->ts.u.cl == NULL
2193 || expr->ts.u.cl->length == NULL
2194 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2200 /* We have constant lower and upper bounds. If the
2201 difference between is 1, it can be considered a
2203 start = (int) mpz_get_si
2204 (ref->u.ar.as->lower[0]->value.integer);
2205 end = (int) mpz_get_si
2206 (ref->u.ar.as->upper[0]->value.integer);
2207 if (end - start + 1 != 1)
2222 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2224 /* Character string. Make sure it's of length 1. */
2225 if (expr->ts.u.cl == NULL
2226 || expr->ts.u.cl->length == NULL
2227 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2230 else if (expr->rank != 0)
2237 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2238 and, in the case of c_associated, set the binding label based on
2242 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2243 gfc_symbol **new_sym)
2245 char name[GFC_MAX_SYMBOL_LEN + 1];
2246 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2247 int optional_arg = 0, is_pointer = 0;
2248 gfc_try retval = SUCCESS;
2249 gfc_symbol *args_sym;
2250 gfc_typespec *arg_ts;
2252 if (args->expr->expr_type == EXPR_CONSTANT
2253 || args->expr->expr_type == EXPR_OP
2254 || args->expr->expr_type == EXPR_NULL)
2256 gfc_error ("Argument to '%s' at %L is not a variable",
2257 sym->name, &(args->expr->where));
2261 args_sym = args->expr->symtree->n.sym;
2263 /* The typespec for the actual arg should be that stored in the expr
2264 and not necessarily that of the expr symbol (args_sym), because
2265 the actual expression could be a part-ref of the expr symbol. */
2266 arg_ts = &(args->expr->ts);
2268 is_pointer = gfc_is_data_pointer (args->expr);
2270 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2272 /* If the user gave two args then they are providing something for
2273 the optional arg (the second cptr). Therefore, set the name and
2274 binding label to the c_associated for two cptrs. Otherwise,
2275 set c_associated to expect one cptr. */
2279 sprintf (name, "%s_2", sym->name);
2280 sprintf (binding_label, "%s_2", sym->binding_label);
2286 sprintf (name, "%s_1", sym->name);
2287 sprintf (binding_label, "%s_1", sym->binding_label);
2291 /* Get a new symbol for the version of c_associated that
2293 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2295 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2296 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2298 sprintf (name, "%s", sym->name);
2299 sprintf (binding_label, "%s", sym->binding_label);
2301 /* Error check the call. */
2302 if (args->next != NULL)
2304 gfc_error_now ("More actual than formal arguments in '%s' "
2305 "call at %L", name, &(args->expr->where));
2308 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2310 /* Make sure we have either the target or pointer attribute. */
2311 if (!args_sym->attr.target && !is_pointer)
2313 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2314 "a TARGET or an associated pointer",
2316 sym->name, &(args->expr->where));
2320 /* See if we have interoperable type and type param. */
2321 if (verify_c_interop (arg_ts) == SUCCESS
2322 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2324 if (args_sym->attr.target == 1)
2326 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2327 has the target attribute and is interoperable. */
2328 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2329 allocatable variable that has the TARGET attribute and
2330 is not an array of zero size. */
2331 if (args_sym->attr.allocatable == 1)
2333 if (args_sym->attr.dimension != 0
2334 && (args_sym->as && args_sym->as->rank == 0))
2336 gfc_error_now ("Allocatable variable '%s' used as a "
2337 "parameter to '%s' at %L must not be "
2338 "an array of zero size",
2339 args_sym->name, sym->name,
2340 &(args->expr->where));
2346 /* A non-allocatable target variable with C
2347 interoperable type and type parameters must be
2349 if (args_sym && args_sym->attr.dimension)
2351 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2353 gfc_error ("Assumed-shape array '%s' at %L "
2354 "cannot be an argument to the "
2355 "procedure '%s' because "
2356 "it is not C interoperable",
2358 &(args->expr->where), sym->name);
2361 else if (args_sym->as->type == AS_DEFERRED)
2363 gfc_error ("Deferred-shape array '%s' at %L "
2364 "cannot be an argument to the "
2365 "procedure '%s' because "
2366 "it is not C interoperable",
2368 &(args->expr->where), sym->name);
2373 /* Make sure it's not a character string. Arrays of
2374 any type should be ok if the variable is of a C
2375 interoperable type. */
2376 if (arg_ts->type == BT_CHARACTER)
2377 if (arg_ts->u.cl != NULL
2378 && (arg_ts->u.cl->length == NULL
2379 || arg_ts->u.cl->length->expr_type
2382 (arg_ts->u.cl->length->value.integer, 1)
2384 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2386 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2387 "at %L must have a length of 1",
2388 args_sym->name, sym->name,
2389 &(args->expr->where));
2395 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2397 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2399 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2400 "associated scalar POINTER", args_sym->name,
2401 sym->name, &(args->expr->where));
2407 /* The parameter is not required to be C interoperable. If it
2408 is not C interoperable, it must be a nonpolymorphic scalar
2409 with no length type parameters. It still must have either
2410 the pointer or target attribute, and it can be
2411 allocatable (but must be allocated when c_loc is called). */
2412 if (args->expr->rank != 0
2413 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2415 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2416 "scalar", args_sym->name, sym->name,
2417 &(args->expr->where));
2420 else if (arg_ts->type == BT_CHARACTER
2421 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2423 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2424 "%L must have a length of 1",
2425 args_sym->name, sym->name,
2426 &(args->expr->where));
2431 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2433 if (args_sym->attr.flavor != FL_PROCEDURE)
2435 /* TODO: Update this error message to allow for procedure
2436 pointers once they are implemented. */
2437 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2439 args_sym->name, sym->name,
2440 &(args->expr->where));
2443 else if (args_sym->attr.is_bind_c != 1)
2445 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2447 args_sym->name, sym->name,
2448 &(args->expr->where));
2453 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2458 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2459 "iso_c_binding function: '%s'!\n", sym->name);
2466 /* Resolve a function call, which means resolving the arguments, then figuring
2467 out which entity the name refers to. */
2468 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2469 to INTENT(OUT) or INTENT(INOUT). */
2472 resolve_function (gfc_expr *expr)
2474 gfc_actual_arglist *arg;
2479 procedure_type p = PROC_INTRINSIC;
2480 bool no_formal_args;
2484 sym = expr->symtree->n.sym;
2486 if (sym && sym->attr.intrinsic
2487 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2490 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2492 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2496 if (sym && sym->attr.abstract)
2498 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2499 sym->name, &expr->where);
2503 /* Switch off assumed size checking and do this again for certain kinds
2504 of procedure, once the procedure itself is resolved. */
2505 need_full_assumed_size++;
2507 if (expr->symtree && expr->symtree->n.sym)
2508 p = expr->symtree->n.sym->attr.proc;
2510 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2511 if (resolve_actual_arglist (expr->value.function.actual,
2512 p, no_formal_args) == FAILURE)
2515 /* Need to setup the call to the correct c_associated, depending on
2516 the number of cptrs to user gives to compare. */
2517 if (sym && sym->attr.is_iso_c == 1)
2519 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2523 /* Get the symtree for the new symbol (resolved func).
2524 the old one will be freed later, when it's no longer used. */
2525 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2528 /* Resume assumed_size checking. */
2529 need_full_assumed_size--;
2531 /* If the procedure is external, check for usage. */
2532 if (sym && is_external_proc (sym))
2533 resolve_global_procedure (sym, &expr->where,
2534 &expr->value.function.actual, 0);
2536 if (sym && sym->ts.type == BT_CHARACTER
2538 && sym->ts.u.cl->length == NULL
2540 && expr->value.function.esym == NULL
2541 && !sym->attr.contained)
2543 /* Internal procedures are taken care of in resolve_contained_fntype. */
2544 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2545 "be used at %L since it is not a dummy argument",
2546 sym->name, &expr->where);
2550 /* See if function is already resolved. */
2552 if (expr->value.function.name != NULL)
2554 if (expr->ts.type == BT_UNKNOWN)
2560 /* Apply the rules of section 14.1.2. */
2562 switch (procedure_kind (sym))
2565 t = resolve_generic_f (expr);
2568 case PTYPE_SPECIFIC:
2569 t = resolve_specific_f (expr);
2573 t = resolve_unknown_f (expr);
2577 gfc_internal_error ("resolve_function(): bad function type");
2581 /* If the expression is still a function (it might have simplified),
2582 then we check to see if we are calling an elemental function. */
2584 if (expr->expr_type != EXPR_FUNCTION)
2587 temp = need_full_assumed_size;
2588 need_full_assumed_size = 0;
2590 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2593 if (omp_workshare_flag
2594 && expr->value.function.esym
2595 && ! gfc_elemental (expr->value.function.esym))
2597 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2598 "in WORKSHARE construct", expr->value.function.esym->name,
2603 #define GENERIC_ID expr->value.function.isym->id
2604 else if (expr->value.function.actual != NULL
2605 && expr->value.function.isym != NULL
2606 && GENERIC_ID != GFC_ISYM_LBOUND
2607 && GENERIC_ID != GFC_ISYM_LEN
2608 && GENERIC_ID != GFC_ISYM_LOC
2609 && GENERIC_ID != GFC_ISYM_PRESENT)
2611 /* Array intrinsics must also have the last upper bound of an
2612 assumed size array argument. UBOUND and SIZE have to be
2613 excluded from the check if the second argument is anything
2616 for (arg = expr->value.function.actual; arg; arg = arg->next)
2618 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2619 && arg->next != NULL && arg->next->expr)
2621 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2624 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2627 if ((int)mpz_get_si (arg->next->expr->value.integer)
2632 if (arg->expr != NULL
2633 && arg->expr->rank > 0
2634 && resolve_assumed_size_actual (arg->expr))
2640 need_full_assumed_size = temp;
2643 if (!pure_function (expr, &name) && name)
2647 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2648 "FORALL %s", name, &expr->where,
2649 forall_flag == 2 ? "mask" : "block");
2652 else if (gfc_pure (NULL))
2654 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2655 "procedure within a PURE procedure", name, &expr->where);
2660 /* Functions without the RECURSIVE attribution are not allowed to
2661 * call themselves. */
2662 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2665 esym = expr->value.function.esym;
2667 if (is_illegal_recursion (esym, gfc_current_ns))
2669 if (esym->attr.entry && esym->ns->entries)
2670 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2671 " function '%s' is not RECURSIVE",
2672 esym->name, &expr->where, esym->ns->entries->sym->name);
2674 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2675 " is not RECURSIVE", esym->name, &expr->where);
2681 /* Character lengths of use associated functions may contains references to
2682 symbols not referenced from the current program unit otherwise. Make sure
2683 those symbols are marked as referenced. */
2685 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2686 && expr->value.function.esym->attr.use_assoc)
2688 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
2692 && !((expr->value.function.esym
2693 && expr->value.function.esym->attr.elemental)
2695 (expr->value.function.isym
2696 && expr->value.function.isym->elemental)))
2697 find_noncopying_intrinsics (expr->value.function.esym,
2698 expr->value.function.actual);
2700 /* Make sure that the expression has a typespec that works. */
2701 if (expr->ts.type == BT_UNKNOWN)
2703 if (expr->symtree->n.sym->result
2704 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2705 && !expr->symtree->n.sym->result->attr.proc_pointer)
2706 expr->ts = expr->symtree->n.sym->result->ts;
2713 /************* Subroutine resolution *************/
2716 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2722 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2723 sym->name, &c->loc);
2724 else if (gfc_pure (NULL))
2725 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2731 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2735 if (sym->attr.generic)
2737 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2740 c->resolved_sym = s;
2741 pure_subroutine (c, s);
2745 /* TODO: Need to search for elemental references in generic interface. */
2748 if (sym->attr.intrinsic)
2749 return gfc_intrinsic_sub_interface (c, 0);
2756 resolve_generic_s (gfc_code *c)
2761 sym = c->symtree->n.sym;
2765 m = resolve_generic_s0 (c, sym);
2768 else if (m == MATCH_ERROR)
2772 if (sym->ns->parent == NULL)
2774 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2778 if (!generic_sym (sym))
2782 /* Last ditch attempt. See if the reference is to an intrinsic
2783 that possesses a matching interface. 14.1.2.4 */
2784 sym = c->symtree->n.sym;
2786 if (!gfc_is_intrinsic (sym, 1, c->loc))
2788 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2789 sym->name, &c->loc);
2793 m = gfc_intrinsic_sub_interface (c, 0);
2797 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2798 "intrinsic subroutine interface", sym->name, &c->loc);
2804 /* Set the name and binding label of the subroutine symbol in the call
2805 expression represented by 'c' to include the type and kind of the
2806 second parameter. This function is for resolving the appropriate
2807 version of c_f_pointer() and c_f_procpointer(). For example, a
2808 call to c_f_pointer() for a default integer pointer could have a
2809 name of c_f_pointer_i4. If no second arg exists, which is an error
2810 for these two functions, it defaults to the generic symbol's name
2811 and binding label. */
2814 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2815 char *name, char *binding_label)
2817 gfc_expr *arg = NULL;
2821 /* The second arg of c_f_pointer and c_f_procpointer determines
2822 the type and kind for the procedure name. */
2823 arg = c->ext.actual->next->expr;
2827 /* Set up the name to have the given symbol's name,
2828 plus the type and kind. */
2829 /* a derived type is marked with the type letter 'u' */
2830 if (arg->ts.type == BT_DERIVED)
2833 kind = 0; /* set the kind as 0 for now */
2837 type = gfc_type_letter (arg->ts.type);
2838 kind = arg->ts.kind;
2841 if (arg->ts.type == BT_CHARACTER)
2842 /* Kind info for character strings not needed. */
2845 sprintf (name, "%s_%c%d", sym->name, type, kind);
2846 /* Set up the binding label as the given symbol's label plus
2847 the type and kind. */
2848 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2852 /* If the second arg is missing, set the name and label as
2853 was, cause it should at least be found, and the missing
2854 arg error will be caught by compare_parameters(). */
2855 sprintf (name, "%s", sym->name);
2856 sprintf (binding_label, "%s", sym->binding_label);
2863 /* Resolve a generic version of the iso_c_binding procedure given
2864 (sym) to the specific one based on the type and kind of the
2865 argument(s). Currently, this function resolves c_f_pointer() and
2866 c_f_procpointer based on the type and kind of the second argument
2867 (FPTR). Other iso_c_binding procedures aren't specially handled.
2868 Upon successfully exiting, c->resolved_sym will hold the resolved
2869 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2873 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2875 gfc_symbol *new_sym;
2876 /* this is fine, since we know the names won't use the max */
2877 char name[GFC_MAX_SYMBOL_LEN + 1];
2878 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2879 /* default to success; will override if find error */
2880 match m = MATCH_YES;
2882 /* Make sure the actual arguments are in the necessary order (based on the
2883 formal args) before resolving. */
2884 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2886 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2887 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2889 set_name_and_label (c, sym, name, binding_label);
2891 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2893 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
2895 /* Make sure we got a third arg if the second arg has non-zero
2896 rank. We must also check that the type and rank are
2897 correct since we short-circuit this check in
2898 gfc_procedure_use() (called above to sort actual args). */
2899 if (c->ext.actual->next->expr->rank != 0)
2901 if(c->ext.actual->next->next == NULL
2902 || c->ext.actual->next->next->expr == NULL)
2905 gfc_error ("Missing SHAPE parameter for call to %s "
2906 "at %L", sym->name, &(c->loc));
2908 else if (c->ext.actual->next->next->expr->ts.type
2910 || c->ext.actual->next->next->expr->rank != 1)
2913 gfc_error ("SHAPE parameter for call to %s at %L must "
2914 "be a rank 1 INTEGER array", sym->name,
2921 if (m != MATCH_ERROR)
2923 /* the 1 means to add the optional arg to formal list */
2924 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
2926 /* for error reporting, say it's declared where the original was */
2927 new_sym->declared_at = sym->declared_at;
2932 /* no differences for c_loc or c_funloc */
2936 /* set the resolved symbol */
2937 if (m != MATCH_ERROR)
2938 c->resolved_sym = new_sym;
2940 c->resolved_sym = sym;
2946 /* Resolve a subroutine call known to be specific. */
2949 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
2953 if(sym->attr.is_iso_c)
2955 m = gfc_iso_c_sub_interface (c,sym);
2959 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2961 if (sym->attr.dummy)
2963 sym->attr.proc = PROC_DUMMY;
2967 sym->attr.proc = PROC_EXTERNAL;
2971 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
2974 if (sym->attr.intrinsic)
2976 m = gfc_intrinsic_sub_interface (c, 1);
2980 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
2981 "with an intrinsic", sym->name, &c->loc);
2989 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2991 c->resolved_sym = sym;
2992 pure_subroutine (c, sym);
2999 resolve_specific_s (gfc_code *c)
3004 sym = c->symtree->n.sym;
3008 m = resolve_specific_s0 (c, sym);
3011 if (m == MATCH_ERROR)
3014 if (sym->ns->parent == NULL)
3017 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3023 sym = c->symtree->n.sym;
3024 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3025 sym->name, &c->loc);
3031 /* Resolve a subroutine call not known to be generic nor specific. */
3034 resolve_unknown_s (gfc_code *c)
3038 sym = c->symtree->n.sym;
3040 if (sym->attr.dummy)
3042 sym->attr.proc = PROC_DUMMY;
3046 /* See if we have an intrinsic function reference. */
3048 if (gfc_is_intrinsic (sym, 1, c->loc))
3050 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3055 /* The reference is to an external name. */
3058 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3060 c->resolved_sym = sym;
3062 pure_subroutine (c, sym);
3068 /* Resolve a subroutine call. Although it was tempting to use the same code
3069 for functions, subroutines and functions are stored differently and this
3070 makes things awkward. */
3073 resolve_call (gfc_code *c)
3076 procedure_type ptype = PROC_INTRINSIC;
3077 gfc_symbol *csym, *sym;
3078 bool no_formal_args;
3080 csym = c->symtree ? c->symtree->n.sym : NULL;
3082 if (csym && csym->ts.type != BT_UNKNOWN)
3084 gfc_error ("'%s' at %L has a type, which is not consistent with "
3085 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3089 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3092 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3093 sym = st ? st->n.sym : NULL;
3094 if (sym && csym != sym
3095 && sym->ns == gfc_current_ns
3096 && sym->attr.flavor == FL_PROCEDURE
3097 && sym->attr.contained)
3100 if (csym->attr.generic)
3101 c->symtree->n.sym = sym;
3104 csym = c->symtree->n.sym;
3108 /* Subroutines without the RECURSIVE attribution are not allowed to
3109 * call themselves. */
3110 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3112 if (csym->attr.entry && csym->ns->entries)
3113 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3114 " subroutine '%s' is not RECURSIVE",
3115 csym->name, &c->loc, csym->ns->entries->sym->name);
3117 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3118 " is not RECURSIVE", csym->name, &c->loc);
3123 /* Switch off assumed size checking and do this again for certain kinds
3124 of procedure, once the procedure itself is resolved. */
3125 need_full_assumed_size++;
3128 ptype = csym->attr.proc;
3130 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3131 if (resolve_actual_arglist (c->ext.actual, ptype,
3132 no_formal_args) == FAILURE)
3135 /* Resume assumed_size checking. */
3136 need_full_assumed_size--;
3138 /* If external, check for usage. */
3139 if (csym && is_external_proc (csym))
3140 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3143 if (c->resolved_sym == NULL)
3145 c->resolved_isym = NULL;
3146 switch (procedure_kind (csym))
3149 t = resolve_generic_s (c);
3152 case PTYPE_SPECIFIC:
3153 t = resolve_specific_s (c);
3157 t = resolve_unknown_s (c);
3161 gfc_internal_error ("resolve_subroutine(): bad function type");
3165 /* Some checks of elemental subroutine actual arguments. */
3166 if (resolve_elemental_actual (NULL, c) == FAILURE)
3169 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3170 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3175 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3176 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3177 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3178 if their shapes do not match. If either op1->shape or op2->shape is
3179 NULL, return SUCCESS. */
3182 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3189 if (op1->shape != NULL && op2->shape != NULL)
3191 for (i = 0; i < op1->rank; i++)
3193 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3195 gfc_error ("Shapes for operands at %L and %L are not conformable",
3196 &op1->where, &op2->where);
3207 /* Resolve an operator expression node. This can involve replacing the
3208 operation with a user defined function call. */
3211 resolve_operator (gfc_expr *e)
3213 gfc_expr *op1, *op2;
3215 bool dual_locus_error;
3218 /* Resolve all subnodes-- give them types. */
3220 switch (e->value.op.op)
3223 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3226 /* Fall through... */
3229 case INTRINSIC_UPLUS:
3230 case INTRINSIC_UMINUS:
3231 case INTRINSIC_PARENTHESES:
3232 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3237 /* Typecheck the new node. */
3239 op1 = e->value.op.op1;
3240 op2 = e->value.op.op2;
3241 dual_locus_error = false;
3243 if ((op1 && op1->expr_type == EXPR_NULL)
3244 || (op2 && op2->expr_type == EXPR_NULL))
3246 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3250 switch (e->value.op.op)
3252 case INTRINSIC_UPLUS:
3253 case INTRINSIC_UMINUS:
3254 if (op1->ts.type == BT_INTEGER
3255 || op1->ts.type == BT_REAL
3256 || op1->ts.type == BT_COMPLEX)
3262 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3263 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3266 case INTRINSIC_PLUS:
3267 case INTRINSIC_MINUS:
3268 case INTRINSIC_TIMES:
3269 case INTRINSIC_DIVIDE:
3270 case INTRINSIC_POWER:
3271 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3273 gfc_type_convert_binary (e);
3278 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3279 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3280 gfc_typename (&op2->ts));
3283 case INTRINSIC_CONCAT:
3284 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3285 && op1->ts.kind == op2->ts.kind)
3287 e->ts.type = BT_CHARACTER;
3288 e->ts.kind = op1->ts.kind;
3293 _("Operands of string concatenation operator at %%L are %s/%s"),
3294 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3300 case INTRINSIC_NEQV:
3301 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3303 e->ts.type = BT_LOGICAL;
3304 e->ts.kind = gfc_kind_max (op1, op2);
3305 if (op1->ts.kind < e->ts.kind)
3306 gfc_convert_type (op1, &e->ts, 2);
3307 else if (op2->ts.kind < e->ts.kind)
3308 gfc_convert_type (op2, &e->ts, 2);
3312 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3313 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3314 gfc_typename (&op2->ts));
3319 if (op1->ts.type == BT_LOGICAL)
3321 e->ts.type = BT_LOGICAL;
3322 e->ts.kind = op1->ts.kind;
3326 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3327 gfc_typename (&op1->ts));
3331 case INTRINSIC_GT_OS:
3333 case INTRINSIC_GE_OS:
3335 case INTRINSIC_LT_OS:
3337 case INTRINSIC_LE_OS:
3338 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3340 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3344 /* Fall through... */
3347 case INTRINSIC_EQ_OS:
3349 case INTRINSIC_NE_OS:
3350 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3351 && op1->ts.kind == op2->ts.kind)
3353 e->ts.type = BT_LOGICAL;
3354 e->ts.kind = gfc_default_logical_kind;
3358 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3360 gfc_type_convert_binary (e);
3362 e->ts.type = BT_LOGICAL;
3363 e->ts.kind = gfc_default_logical_kind;
3367 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3369 _("Logicals at %%L must be compared with %s instead of %s"),
3370 (e->value.op.op == INTRINSIC_EQ
3371 || e->value.op.op == INTRINSIC_EQ_OS)
3372 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3375 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3376 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3377 gfc_typename (&op2->ts));
3381 case INTRINSIC_USER:
3382 if (e->value.op.uop->op == NULL)
3383 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3384 else if (op2 == NULL)
3385 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3386 e->value.op.uop->name, gfc_typename (&op1->ts));
3388 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3389 e->value.op.uop->name, gfc_typename (&op1->ts),
3390 gfc_typename (&op2->ts));
3394 case INTRINSIC_PARENTHESES:
3396 if (e->ts.type == BT_CHARACTER)
3397 e->ts.u.cl = op1->ts.u.cl;
3401 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3404 /* Deal with arrayness of an operand through an operator. */
3408 switch (e->value.op.op)
3410 case INTRINSIC_PLUS:
3411 case INTRINSIC_MINUS:
3412 case INTRINSIC_TIMES:
3413 case INTRINSIC_DIVIDE:
3414 case INTRINSIC_POWER:
3415 case INTRINSIC_CONCAT:
3419 case INTRINSIC_NEQV:
3421 case INTRINSIC_EQ_OS:
3423 case INTRINSIC_NE_OS:
3425 case INTRINSIC_GT_OS:
3427 case INTRINSIC_GE_OS:
3429 case INTRINSIC_LT_OS:
3431 case INTRINSIC_LE_OS:
3433 if (op1->rank == 0 && op2->rank == 0)
3436 if (op1->rank == 0 && op2->rank != 0)
3438 e->rank = op2->rank;
3440 if (e->shape == NULL)
3441 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3444 if (op1->rank != 0 && op2->rank == 0)
3446 e->rank = op1->rank;
3448 if (e->shape == NULL)
3449 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3452 if (op1->rank != 0 && op2->rank != 0)
3454 if (op1->rank == op2->rank)
3456 e->rank = op1->rank;
3457 if (e->shape == NULL)
3459 t = compare_shapes(op1, op2);
3463 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3468 /* Allow higher level expressions to work. */
3471 /* Try user-defined operators, and otherwise throw an error. */
3472 dual_locus_error = true;
3474 _("Inconsistent ranks for operator at %%L and %%L"));
3481 case INTRINSIC_PARENTHESES:
3483 case INTRINSIC_UPLUS:
3484 case INTRINSIC_UMINUS:
3485 /* Simply copy arrayness attribute */
3486 e->rank = op1->rank;
3488 if (e->shape == NULL)
3489 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3497 /* Attempt to simplify the expression. */
3500 t = gfc_simplify_expr (e, 0);
3501 /* Some calls do not succeed in simplification and return FAILURE
3502 even though there is no error; e.g. variable references to
3503 PARAMETER arrays. */
3504 if (!gfc_is_constant_expr (e))
3511 if (gfc_extend_expr (e) == SUCCESS)
3514 if (dual_locus_error)
3515 gfc_error (msg, &op1->where, &op2->where);
3517 gfc_error (msg, &e->where);
3523 /************** Array resolution subroutines **************/
3526 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3529 /* Compare two integer expressions. */
3532 compare_bound (gfc_expr *a, gfc_expr *b)
3536 if (a == NULL || a->expr_type != EXPR_CONSTANT
3537 || b == NULL || b->expr_type != EXPR_CONSTANT)
3540 /* If either of the types isn't INTEGER, we must have
3541 raised an error earlier. */
3543 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3546 i = mpz_cmp (a->value.integer, b->value.integer);
3556 /* Compare an integer expression with an integer. */
3559 compare_bound_int (gfc_expr *a, int b)
3563 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3566 if (a->ts.type != BT_INTEGER)
3567 gfc_internal_error ("compare_bound_int(): Bad expression");
3569 i = mpz_cmp_si (a->value.integer, b);
3579 /* Compare an integer expression with a mpz_t. */
3582 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3586 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3589 if (a->ts.type != BT_INTEGER)
3590 gfc_internal_error ("compare_bound_int(): Bad expression");
3592 i = mpz_cmp (a->value.integer, b);
3602 /* Compute the last value of a sequence given by a triplet.
3603 Return 0 if it wasn't able to compute the last value, or if the
3604 sequence if empty, and 1 otherwise. */
3607 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3608 gfc_expr *stride, mpz_t last)
3612 if (start == NULL || start->expr_type != EXPR_CONSTANT
3613 || end == NULL || end->expr_type != EXPR_CONSTANT
3614 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3617 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3618 || (stride != NULL && stride->ts.type != BT_INTEGER))
3621 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3623 if (compare_bound (start, end) == CMP_GT)
3625 mpz_set (last, end->value.integer);
3629 if (compare_bound_int (stride, 0) == CMP_GT)
3631 /* Stride is positive */
3632 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3637 /* Stride is negative */
3638 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3643 mpz_sub (rem, end->value.integer, start->value.integer);
3644 mpz_tdiv_r (rem, rem, stride->value.integer);
3645 mpz_sub (last, end->value.integer, rem);
3652 /* Compare a single dimension of an array reference to the array
3656 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3660 /* Given start, end and stride values, calculate the minimum and
3661 maximum referenced indexes. */
3663 switch (ar->dimen_type[i])
3669 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3671 gfc_warning ("Array reference at %L is out of bounds "
3672 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3673 mpz_get_si (ar->start[i]->value.integer),
3674 mpz_get_si (as->lower[i]->value.integer), i+1);
3677 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3679 gfc_warning ("Array reference at %L is out of bounds "
3680 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3681 mpz_get_si (ar->start[i]->value.integer),
3682 mpz_get_si (as->upper[i]->value.integer), i+1);
3690 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3691 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3693 comparison comp_start_end = compare_bound (AR_START, AR_END);
3695 /* Check for zero stride, which is not allowed. */
3696 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3698 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3702 /* if start == len || (stride > 0 && start < len)
3703 || (stride < 0 && start > len),
3704 then the array section contains at least one element. In this
3705 case, there is an out-of-bounds access if
3706 (start < lower || start > upper). */
3707 if (compare_bound (AR_START, AR_END) == CMP_EQ
3708 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3709 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3710 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3711 && comp_start_end == CMP_GT))
3713 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3715 gfc_warning ("Lower array reference at %L is out of bounds "
3716 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3717 mpz_get_si (AR_START->value.integer),
3718 mpz_get_si (as->lower[i]->value.integer), i+1);
3721 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3723 gfc_warning ("Lower array reference at %L is out of bounds "
3724 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3725 mpz_get_si (AR_START->value.integer),
3726 mpz_get_si (as->upper[i]->value.integer), i+1);
3731 /* If we can compute the highest index of the array section,
3732 then it also has to be between lower and upper. */
3733 mpz_init (last_value);
3734 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3737 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3739 gfc_warning ("Upper array reference at %L is out of bounds "
3740 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3741 mpz_get_si (last_value),
3742 mpz_get_si (as->lower[i]->value.integer), i+1);
3743 mpz_clear (last_value);
3746 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3748 gfc_warning ("Upper array reference at %L is out of bounds "
3749 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3750 mpz_get_si (last_value),
3751 mpz_get_si (as->upper[i]->value.integer), i+1);
3752 mpz_clear (last_value);
3756 mpz_clear (last_value);
3764 gfc_internal_error ("check_dimension(): Bad array reference");
3771 /* Compare an array reference with an array specification. */
3774 compare_spec_to_ref (gfc_array_ref *ar)
3781 /* TODO: Full array sections are only allowed as actual parameters. */
3782 if (as->type == AS_ASSUMED_SIZE
3783 && (/*ar->type == AR_FULL
3784 ||*/ (ar->type == AR_SECTION
3785 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3787 gfc_error ("Rightmost upper bound of assumed size array section "
3788 "not specified at %L", &ar->where);
3792 if (ar->type == AR_FULL)
3795 if (as->rank != ar->dimen)
3797 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3798 &ar->where, ar->dimen, as->rank);
3802 for (i = 0; i < as->rank; i++)
3803 if (check_dimension (i, ar, as) == FAILURE)
3810 /* Resolve one part of an array index. */
3813 gfc_resolve_index (gfc_expr *index, int check_scalar)
3820 if (gfc_resolve_expr (index) == FAILURE)
3823 if (check_scalar && index->rank != 0)
3825 gfc_error ("Array index at %L must be scalar", &index->where);
3829 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
3831 gfc_error ("Array index at %L must be of INTEGER type, found %s",
3832 &index->where, gfc_basic_typename (index->ts.type));
3836 if (index->ts.type == BT_REAL)
3837 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
3838 &index->where) == FAILURE)
3841 if (index->ts.kind != gfc_index_integer_kind
3842 || index->ts.type != BT_INTEGER)
3845 ts.type = BT_INTEGER;
3846 ts.kind = gfc_index_integer_kind;
3848 gfc_convert_type_warn (index, &ts, 2, 0);
3854 /* Resolve a dim argument to an intrinsic function. */
3857 gfc_resolve_dim_arg (gfc_expr *dim)
3862 if (gfc_resolve_expr (dim) == FAILURE)
3867 gfc_error ("Argument dim at %L must be scalar", &dim->where);
3872 if (dim->ts.type != BT_INTEGER)
3874 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
3878 if (dim->ts.kind != gfc_index_integer_kind)
3882 ts.type = BT_INTEGER;
3883 ts.kind = gfc_index_integer_kind;
3885 gfc_convert_type_warn (dim, &ts, 2, 0);
3891 /* Given an expression that contains array references, update those array
3892 references to point to the right array specifications. While this is
3893 filled in during matching, this information is difficult to save and load
3894 in a module, so we take care of it here.
3896 The idea here is that the original array reference comes from the
3897 base symbol. We traverse the list of reference structures, setting
3898 the stored reference to references. Component references can
3899 provide an additional array specification. */
3902 find_array_spec (gfc_expr *e)
3906 gfc_symbol *derived;
3909 as = e->symtree->n.sym->as;
3912 for (ref = e->ref; ref; ref = ref->next)
3917 gfc_internal_error ("find_array_spec(): Missing spec");
3924 if (derived == NULL)
3925 derived = e->symtree->n.sym->ts.u.derived;
3927 c = derived->components;
3929 for (; c; c = c->next)
3930 if (c == ref->u.c.component)
3932 /* Track the sequence of component references. */
3933 if (c->ts.type == BT_DERIVED)
3934 derived = c->ts.u.derived;
3939 gfc_internal_error ("find_array_spec(): Component not found");
3941 if (c->attr.dimension)
3944 gfc_internal_error ("find_array_spec(): unused as(1)");
3955 gfc_internal_error ("find_array_spec(): unused as(2)");
3959 /* Resolve an array reference. */
3962 resolve_array_ref (gfc_array_ref *ar)
3964 int i, check_scalar;
3967 for (i = 0; i < ar->dimen; i++)
3969 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
3971 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
3973 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
3975 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
3980 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
3984 ar->dimen_type[i] = DIMEN_ELEMENT;
3988 ar->dimen_type[i] = DIMEN_VECTOR;
3989 if (e->expr_type == EXPR_VARIABLE
3990 && e->symtree->n.sym->ts.type == BT_DERIVED)
3991 ar->start[i] = gfc_get_parentheses (e);
3995 gfc_error ("Array index at %L is an array of rank %d",
3996 &ar->c_where[i], e->rank);
4001 /* If the reference type is unknown, figure out what kind it is. */
4003 if (ar->type == AR_UNKNOWN)
4005 ar->type = AR_ELEMENT;
4006 for (i = 0; i < ar->dimen; i++)
4007 if (ar->dimen_type[i] == DIMEN_RANGE
4008 || ar->dimen_type[i] == DIMEN_VECTOR)
4010 ar->type = AR_SECTION;
4015 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4023 resolve_substring (gfc_ref *ref)
4025 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4027 if (ref->u.ss.start != NULL)
4029 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4032 if (ref->u.ss.start->ts.type != BT_INTEGER)
4034 gfc_error ("Substring start index at %L must be of type INTEGER",
4035 &ref->u.ss.start->where);
4039 if (ref->u.ss.start->rank != 0)
4041 gfc_error ("Substring start index at %L must be scalar",
4042 &ref->u.ss.start->where);
4046 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4047 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4048 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4050 gfc_error ("Substring start index at %L is less than one",
4051 &ref->u.ss.start->where);
4056 if (ref->u.ss.end != NULL)
4058 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4061 if (ref->u.ss.end->ts.type != BT_INTEGER)
4063 gfc_error ("Substring end index at %L must be of type INTEGER",
4064 &ref->u.ss.end->where);
4068 if (ref->u.ss.end->rank != 0)
4070 gfc_error ("Substring end index at %L must be scalar",
4071 &ref->u.ss.end->where);
4075 if (ref->u.ss.length != NULL
4076 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4077 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4078 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4080 gfc_error ("Substring end index at %L exceeds the string length",
4081 &ref->u.ss.start->where);
4085 if (compare_bound_mpz_t (ref->u.ss.end,
4086 gfc_integer_kinds[k].huge) == CMP_GT
4087 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4088 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4090 gfc_error ("Substring end index at %L is too large",
4091 &ref->u.ss.end->where);
4100 /* This function supplies missing substring charlens. */
4103 gfc_resolve_substring_charlen (gfc_expr *e)
4106 gfc_expr *start, *end;
4108 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4109 if (char_ref->type == REF_SUBSTRING)
4115 gcc_assert (char_ref->next == NULL);
4119 if (e->ts.u.cl->length)
4120 gfc_free_expr (e->ts.u.cl->length);
4121 else if (e->expr_type == EXPR_VARIABLE
4122 && e->symtree->n.sym->attr.dummy)
4126 e->ts.type = BT_CHARACTER;
4127 e->ts.kind = gfc_default_character_kind;
4130 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4132 if (char_ref->u.ss.start)
4133 start = gfc_copy_expr (char_ref->u.ss.start);
4135 start = gfc_int_expr (1);
4137 if (char_ref->u.ss.end)
4138 end = gfc_copy_expr (char_ref->u.ss.end);
4139 else if (e->expr_type == EXPR_VARIABLE)
4140 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4147 /* Length = (end - start +1). */
4148 e->ts.u.cl->length = gfc_subtract (end, start);
4149 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length, gfc_int_expr (1));
4151 e->ts.u.cl->length->ts.type = BT_INTEGER;
4152 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4154 /* Make sure that the length is simplified. */
4155 gfc_simplify_expr (e->ts.u.cl->length, 1);
4156 gfc_resolve_expr (e->ts.u.cl->length);
4160 /* Resolve subtype references. */
4163 resolve_ref (gfc_expr *expr)
4165 int current_part_dimension, n_components, seen_part_dimension;
4168 for (ref = expr->ref; ref; ref = ref->next)
4169 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4171 find_array_spec (expr);
4175 for (ref = expr->ref; ref; ref = ref->next)
4179 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4187 resolve_substring (ref);
4191 /* Check constraints on part references. */
4193 current_part_dimension = 0;
4194 seen_part_dimension = 0;
4197 for (ref = expr->ref; ref; ref = ref->next)
4202 switch (ref->u.ar.type)
4206 current_part_dimension = 1;
4210 current_part_dimension = 0;
4214 gfc_internal_error ("resolve_ref(): Bad array reference");
4220 if (current_part_dimension || seen_part_dimension)
4222 if (ref->u.c.component->attr.pointer)
4224 gfc_error ("Component to the right of a part reference "
4225 "with nonzero rank must not have the POINTER "
4226 "attribute at %L", &expr->where);
4229 else if (ref->u.c.component->attr.allocatable)
4231 gfc_error ("Component to the right of a part reference "
4232 "with nonzero rank must not have the ALLOCATABLE "
4233 "attribute at %L", &expr->where);
4245 if (((ref->type == REF_COMPONENT && n_components > 1)
4246 || ref->next == NULL)
4247 && current_part_dimension
4248 && seen_part_dimension)
4250 gfc_error ("Two or more part references with nonzero rank must "
4251 "not be specified at %L", &expr->where);
4255 if (ref->type == REF_COMPONENT)
4257 if (current_part_dimension)
4258 seen_part_dimension = 1;
4260 /* reset to make sure */
4261 current_part_dimension = 0;
4269 /* Given an expression, determine its shape. This is easier than it sounds.
4270 Leaves the shape array NULL if it is not possible to determine the shape. */
4273 expression_shape (gfc_expr *e)
4275 mpz_t array[GFC_MAX_DIMENSIONS];
4278 if (e->rank == 0 || e->shape != NULL)
4281 for (i = 0; i < e->rank; i++)
4282 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4285 e->shape = gfc_get_shape (e->rank);
4287 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4292 for (i--; i >= 0; i--)
4293 mpz_clear (array[i]);
4297 /* Given a variable expression node, compute the rank of the expression by
4298 examining the base symbol and any reference structures it may have. */
4301 expression_rank (gfc_expr *e)
4306 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4307 could lead to serious confusion... */
4308 gcc_assert (e->expr_type != EXPR_COMPCALL);
4312 if (e->expr_type == EXPR_ARRAY)
4314 /* Constructors can have a rank different from one via RESHAPE(). */
4316 if (e->symtree == NULL)
4322 e->rank = (e->symtree->n.sym->as == NULL)
4323 ? 0 : e->symtree->n.sym->as->rank;
4329 for (ref = e->ref; ref; ref = ref->next)
4331 if (ref->type != REF_ARRAY)
4334 if (ref->u.ar.type == AR_FULL)
4336 rank = ref->u.ar.as->rank;
4340 if (ref->u.ar.type == AR_SECTION)
4342 /* Figure out the rank of the section. */
4344 gfc_internal_error ("expression_rank(): Two array specs");
4346 for (i = 0; i < ref->u.ar.dimen; i++)
4347 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4348 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4358 expression_shape (e);
4362 /* Resolve a variable expression. */
4365 resolve_variable (gfc_expr *e)
4372 if (e->symtree == NULL)
4375 if (e->ref && resolve_ref (e) == FAILURE)
4378 sym = e->symtree->n.sym;
4379 if (sym->attr.flavor == FL_PROCEDURE
4380 && (!sym->attr.function
4381 || (sym->attr.function && sym->result
4382 && sym->result->attr.proc_pointer
4383 && !sym->result->attr.function)))
4385 e->ts.type = BT_PROCEDURE;
4386 goto resolve_procedure;
4389 if (sym->ts.type != BT_UNKNOWN)
4390 gfc_variable_attr (e, &e->ts);
4393 /* Must be a simple variable reference. */
4394 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4399 if (check_assumed_size_reference (sym, e))
4402 /* Deal with forward references to entries during resolve_code, to
4403 satisfy, at least partially, 12.5.2.5. */
4404 if (gfc_current_ns->entries
4405 && current_entry_id == sym->entry_id
4408 && cs_base->current->op != EXEC_ENTRY)
4410 gfc_entry_list *entry;
4411 gfc_formal_arglist *formal;
4415 /* If the symbol is a dummy... */
4416 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4418 entry = gfc_current_ns->entries;
4421 /* ...test if the symbol is a parameter of previous entries. */
4422 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4423 for (formal = entry->sym->formal; formal; formal = formal->next)
4425 if (formal->sym && sym->name == formal->sym->name)
4429 /* If it has not been seen as a dummy, this is an error. */
4432 if (specification_expr)
4433 gfc_error ("Variable '%s', used in a specification expression"
4434 ", is referenced at %L before the ENTRY statement "
4435 "in which it is a parameter",
4436 sym->name, &cs_base->current->loc);
4438 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4439 "statement in which it is a parameter",
4440 sym->name, &cs_base->current->loc);
4445 /* Now do the same check on the specification expressions. */
4446 specification_expr = 1;
4447 if (sym->ts.type == BT_CHARACTER
4448 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4452 for (n = 0; n < sym->as->rank; n++)
4454 specification_expr = 1;
4455 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4457 specification_expr = 1;
4458 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4461 specification_expr = 0;
4464 /* Update the symbol's entry level. */
4465 sym->entry_id = current_entry_id + 1;
4469 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4476 /* Checks to see that the correct symbol has been host associated.
4477 The only situation where this arises is that in which a twice
4478 contained function is parsed after the host association is made.
4479 Therefore, on detecting this, change the symbol in the expression
4480 and convert the array reference into an actual arglist if the old
4481 symbol is a variable. */
4483 check_host_association (gfc_expr *e)
4485 gfc_symbol *sym, *old_sym;
4489 gfc_actual_arglist *arg, *tail = NULL;
4490 bool retval = e->expr_type == EXPR_FUNCTION;
4492 /* If the expression is the result of substitution in
4493 interface.c(gfc_extend_expr) because there is no way in
4494 which the host association can be wrong. */
4495 if (e->symtree == NULL
4496 || e->symtree->n.sym == NULL
4497 || e->user_operator)
4500 old_sym = e->symtree->n.sym;
4502 if (gfc_current_ns->parent
4503 && old_sym->ns != gfc_current_ns)
4505 /* Use the 'USE' name so that renamed module symbols are
4506 correctly handled. */
4507 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4509 if (sym && old_sym != sym
4510 && sym->ts.type == old_sym->ts.type
4511 && sym->attr.flavor == FL_PROCEDURE
4512 && sym->attr.contained)
4514 /* Clear the shape, since it might not be valid. */
4515 if (e->shape != NULL)
4517 for (n = 0; n < e->rank; n++)
4518 mpz_clear (e->shape[n]);
4520 gfc_free (e->shape);
4523 /* Give the expression the right symtree! */
4524 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4525 gcc_assert (st != NULL);
4527 if (old_sym->attr.flavor == FL_PROCEDURE
4528 || e->expr_type == EXPR_FUNCTION)
4530 /* Original was function so point to the new symbol, since
4531 the actual argument list is already attached to the
4533 e->value.function.esym = NULL;
4538 /* Original was variable so convert array references into
4539 an actual arglist. This does not need any checking now
4540 since gfc_resolve_function will take care of it. */
4541 e->value.function.actual = NULL;
4542 e->expr_type = EXPR_FUNCTION;
4545 /* Ambiguity will not arise if the array reference is not
4546 the last reference. */
4547 for (ref = e->ref; ref; ref = ref->next)
4548 if (ref->type == REF_ARRAY && ref->next == NULL)
4551 gcc_assert (ref->type == REF_ARRAY);
4553 /* Grab the start expressions from the array ref and
4554 copy them into actual arguments. */
4555 for (n = 0; n < ref->u.ar.dimen; n++)
4557 arg = gfc_get_actual_arglist ();
4558 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4559 if (e->value.function.actual == NULL)
4560 tail = e->value.function.actual = arg;
4568 /* Dump the reference list and set the rank. */
4569 gfc_free_ref_list (e->ref);
4571 e->rank = sym->as ? sym->as->rank : 0;
4574 gfc_resolve_expr (e);
4578 /* This might have changed! */
4579 return e->expr_type == EXPR_FUNCTION;
4584 gfc_resolve_character_operator (gfc_expr *e)
4586 gfc_expr *op1 = e->value.op.op1;
4587 gfc_expr *op2 = e->value.op.op2;
4588 gfc_expr *e1 = NULL;
4589 gfc_expr *e2 = NULL;
4591 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4593 if (op1->ts.u.cl && op1->ts.u.cl->length)
4594 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4595 else if (op1->expr_type == EXPR_CONSTANT)
4596 e1 = gfc_int_expr (op1->value.character.length);
4598 if (op2->ts.u.cl && op2->ts.u.cl->length)
4599 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4600 else if (op2->expr_type == EXPR_CONSTANT)
4601 e2 = gfc_int_expr (op2->value.character.length);
4603 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4608 e->ts.u.cl->length = gfc_add (e1, e2);
4609 e->ts.u.cl->length->ts.type = BT_INTEGER;
4610 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4611 gfc_simplify_expr (e->ts.u.cl->length, 0);
4612 gfc_resolve_expr (e->ts.u.cl->length);
4618 /* Ensure that an character expression has a charlen and, if possible, a
4619 length expression. */
4622 fixup_charlen (gfc_expr *e)
4624 /* The cases fall through so that changes in expression type and the need
4625 for multiple fixes are picked up. In all circumstances, a charlen should
4626 be available for the middle end to hang a backend_decl on. */
4627 switch (e->expr_type)
4630 gfc_resolve_character_operator (e);
4633 if (e->expr_type == EXPR_ARRAY)
4634 gfc_resolve_character_array_constructor (e);
4636 case EXPR_SUBSTRING:
4637 if (!e->ts.u.cl && e->ref)
4638 gfc_resolve_substring_charlen (e);
4642 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4649 /* Update an actual argument to include the passed-object for type-bound
4650 procedures at the right position. */
4652 static gfc_actual_arglist*
4653 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
4656 gcc_assert (argpos > 0);
4660 gfc_actual_arglist* result;
4662 result = gfc_get_actual_arglist ();
4666 result->name = name;
4672 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
4674 lst = update_arglist_pass (NULL, po, argpos - 1, name);
4679 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4682 extract_compcall_passed_object (gfc_expr* e)
4686 gcc_assert (e->expr_type == EXPR_COMPCALL);
4688 po = gfc_get_expr ();
4689 po->expr_type = EXPR_VARIABLE;
4690 po->symtree = e->symtree;
4691 po->ref = gfc_copy_ref (e->ref);
4693 if (gfc_resolve_expr (po) == FAILURE)
4700 /* Update the arglist of an EXPR_COMPCALL expression to include the
4704 update_compcall_arglist (gfc_expr* e)
4707 gfc_typebound_proc* tbp;
4709 tbp = e->value.compcall.tbp;
4714 po = extract_compcall_passed_object (e);
4720 gfc_error ("Passed-object at %L must be scalar", &e->where);
4730 gcc_assert (tbp->pass_arg_num > 0);
4731 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4739 /* Extract the passed object from a PPC call (a copy of it). */
4742 extract_ppc_passed_object (gfc_expr *e)
4747 po = gfc_get_expr ();
4748 po->expr_type = EXPR_VARIABLE;
4749 po->symtree = e->symtree;
4750 po->ref = gfc_copy_ref (e->ref);
4752 /* Remove PPC reference. */
4754 while ((*ref)->next)
4755 (*ref) = (*ref)->next;
4756 gfc_free_ref_list (*ref);
4759 if (gfc_resolve_expr (po) == FAILURE)
4766 /* Update the actual arglist of a procedure pointer component to include the
4770 update_ppc_arglist (gfc_expr* e)
4774 gfc_typebound_proc* tb;
4776 if (!gfc_is_proc_ptr_comp (e, &ppc))
4783 else if (tb->nopass)
4786 po = extract_ppc_passed_object (e);
4792 gfc_error ("Passed-object at %L must be scalar", &e->where);
4796 gcc_assert (tb->pass_arg_num > 0);
4797 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4805 /* Check that the object a TBP is called on is valid, i.e. it must not be
4806 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
4809 check_typebound_baseobject (gfc_expr* e)
4813 base = extract_compcall_passed_object (e);
4817 gcc_assert (base->ts.type == BT_DERIVED);
4818 if (base->ts.u.derived->attr.abstract)
4820 gfc_error ("Base object for type-bound procedure call at %L is of"
4821 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
4829 /* Resolve a call to a type-bound procedure, either function or subroutine,
4830 statically from the data in an EXPR_COMPCALL expression. The adapted
4831 arglist and the target-procedure symtree are returned. */
4834 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
4835 gfc_actual_arglist** actual)
4837 gcc_assert (e->expr_type == EXPR_COMPCALL);
4838 gcc_assert (!e->value.compcall.tbp->is_generic);
4840 /* Update the actual arglist for PASS. */
4841 if (update_compcall_arglist (e) == FAILURE)
4844 *actual = e->value.compcall.actual;
4845 *target = e->value.compcall.tbp->u.specific;
4847 gfc_free_ref_list (e->ref);
4849 e->value.compcall.actual = NULL;
4855 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
4856 which of the specific bindings (if any) matches the arglist and transform
4857 the expression into a call of that binding. */
4860 resolve_typebound_generic_call (gfc_expr* e)
4862 gfc_typebound_proc* genproc;
4863 const char* genname;
4865 gcc_assert (e->expr_type == EXPR_COMPCALL);
4866 genname = e->value.compcall.name;
4867 genproc = e->value.compcall.tbp;
4869 if (!genproc->is_generic)
4872 /* Try the bindings on this type and in the inheritance hierarchy. */
4873 for (; genproc; genproc = genproc->overridden)
4877 gcc_assert (genproc->is_generic);
4878 for (g = genproc->u.generic; g; g = g->next)
4881 gfc_actual_arglist* args;
4884 gcc_assert (g->specific);
4886 if (g->specific->error)
4889 target = g->specific->u.specific->n.sym;
4891 /* Get the right arglist by handling PASS/NOPASS. */
4892 args = gfc_copy_actual_arglist (e->value.compcall.actual);
4893 if (!g->specific->nopass)
4896 po = extract_compcall_passed_object (e);
4900 gcc_assert (g->specific->pass_arg_num > 0);
4901 gcc_assert (!g->specific->error);
4902 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
4903 g->specific->pass_arg);
4905 resolve_actual_arglist (args, target->attr.proc,
4906 is_external_proc (target) && !target->formal);
4908 /* Check if this arglist matches the formal. */
4909 matches = gfc_arglist_matches_symbol (&args, target);
4911 /* Clean up and break out of the loop if we've found it. */
4912 gfc_free_actual_arglist (args);
4915 e->value.compcall.tbp = g->specific;
4921 /* Nothing matching found! */
4922 gfc_error ("Found no matching specific binding for the call to the GENERIC"
4923 " '%s' at %L", genname, &e->where);
4931 /* Resolve a call to a type-bound subroutine. */
4934 resolve_typebound_call (gfc_code* c)
4936 gfc_actual_arglist* newactual;
4937 gfc_symtree* target;
4939 /* Check that's really a SUBROUTINE. */
4940 if (!c->expr1->value.compcall.tbp->subroutine)
4942 gfc_error ("'%s' at %L should be a SUBROUTINE",
4943 c->expr1->value.compcall.name, &c->loc);
4947 if (check_typebound_baseobject (c->expr1) == FAILURE)
4950 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
4953 /* Transform into an ordinary EXEC_CALL for now. */
4955 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
4958 c->ext.actual = newactual;
4959 c->symtree = target;
4962 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
4963 gfc_free_expr (c->expr1);
4966 return resolve_call (c);
4970 /* Resolve a component-call expression. */
4973 resolve_compcall (gfc_expr* e)
4975 gfc_actual_arglist* newactual;
4976 gfc_symtree* target;
4978 /* Check that's really a FUNCTION. */
4979 if (!e->value.compcall.tbp->function)
4981 gfc_error ("'%s' at %L should be a FUNCTION",
4982 e->value.compcall.name, &e->where);
4986 if (check_typebound_baseobject (e) == FAILURE)
4989 if (resolve_typebound_generic_call (e) == FAILURE)
4991 gcc_assert (!e->value.compcall.tbp->is_generic);
4993 /* Take the rank from the function's symbol. */
4994 if (e->value.compcall.tbp->u.specific->n.sym->as)
4995 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
4997 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
4998 arglist to the TBP's binding target. */
5000 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5003 e->value.function.actual = newactual;
5004 e->value.function.name = e->value.compcall.name;
5005 e->value.function.esym = target->n.sym;
5006 e->value.function.isym = NULL;
5007 e->symtree = target;
5008 e->ts = target->n.sym->ts;
5009 e->expr_type = EXPR_FUNCTION;
5011 return gfc_resolve_expr (e);
5015 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5018 resolve_ppc_call (gfc_code* c)
5020 gfc_component *comp;
5021 gcc_assert (gfc_is_proc_ptr_comp (c->expr1, &comp));
5023 c->resolved_sym = c->expr1->symtree->n.sym;
5024 c->expr1->expr_type = EXPR_VARIABLE;
5026 if (!comp->attr.subroutine)
5027 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5029 if (resolve_ref (c->expr1) == FAILURE)
5032 if (update_ppc_arglist (c->expr1) == FAILURE)
5035 c->ext.actual = c->expr1->value.compcall.actual;
5037 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5038 comp->formal == NULL) == FAILURE)
5041 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5047 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5050 resolve_expr_ppc (gfc_expr* e)
5052 gfc_component *comp;
5053 gcc_assert (gfc_is_proc_ptr_comp (e, &comp));
5055 /* Convert to EXPR_FUNCTION. */
5056 e->expr_type = EXPR_FUNCTION;
5057 e->value.function.isym = NULL;
5058 e->value.function.actual = e->value.compcall.actual;
5060 if (comp->as != NULL)
5061 e->rank = comp->as->rank;
5063 if (!comp->attr.function)
5064 gfc_add_function (&comp->attr, comp->name, &e->where);
5066 if (resolve_ref (e) == FAILURE)
5069 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5070 comp->formal == NULL) == FAILURE)
5073 if (update_ppc_arglist (e) == FAILURE)
5076 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5082 /* Resolve an expression. That is, make sure that types of operands agree
5083 with their operators, intrinsic operators are converted to function calls
5084 for overloaded types and unresolved function references are resolved. */
5087 gfc_resolve_expr (gfc_expr *e)
5094 switch (e->expr_type)
5097 t = resolve_operator (e);
5103 if (check_host_association (e))
5104 t = resolve_function (e);
5107 t = resolve_variable (e);
5109 expression_rank (e);
5112 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5113 && e->ref->type != REF_SUBSTRING)
5114 gfc_resolve_substring_charlen (e);
5119 t = resolve_compcall (e);
5122 case EXPR_SUBSTRING:
5123 t = resolve_ref (e);
5132 t = resolve_expr_ppc (e);
5137 if (resolve_ref (e) == FAILURE)
5140 t = gfc_resolve_array_constructor (e);
5141 /* Also try to expand a constructor. */
5144 expression_rank (e);
5145 gfc_expand_constructor (e);
5148 /* This provides the opportunity for the length of constructors with
5149 character valued function elements to propagate the string length
5150 to the expression. */
5151 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5152 t = gfc_resolve_character_array_constructor (e);
5156 case EXPR_STRUCTURE:
5157 t = resolve_ref (e);
5161 t = resolve_structure_cons (e);
5165 t = gfc_simplify_expr (e, 0);
5169 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5172 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5179 /* Resolve an expression from an iterator. They must be scalar and have
5180 INTEGER or (optionally) REAL type. */
5183 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5184 const char *name_msgid)
5186 if (gfc_resolve_expr (expr) == FAILURE)
5189 if (expr->rank != 0)
5191 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5195 if (expr->ts.type != BT_INTEGER)
5197 if (expr->ts.type == BT_REAL)
5200 return gfc_notify_std (GFC_STD_F95_DEL,
5201 "Deleted feature: %s at %L must be integer",
5202 _(name_msgid), &expr->where);
5205 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5212 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5220 /* Resolve the expressions in an iterator structure. If REAL_OK is
5221 false allow only INTEGER type iterators, otherwise allow REAL types. */
5224 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5226 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5230 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5232 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5237 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5238 "Start expression in DO loop") == FAILURE)
5241 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5242 "End expression in DO loop") == FAILURE)
5245 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5246 "Step expression in DO loop") == FAILURE)
5249 if (iter->step->expr_type == EXPR_CONSTANT)
5251 if ((iter->step->ts.type == BT_INTEGER
5252 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5253 || (iter->step->ts.type == BT_REAL
5254 && mpfr_sgn (iter->step->value.real) == 0))
5256 gfc_error ("Step expression in DO loop at %L cannot be zero",
5257 &iter->step->where);
5262 /* Convert start, end, and step to the same type as var. */
5263 if (iter->start->ts.kind != iter->var->ts.kind
5264 || iter->start->ts.type != iter->var->ts.type)
5265 gfc_convert_type (iter->start, &iter->var->ts, 2);
5267 if (iter->end->ts.kind != iter->var->ts.kind
5268 || iter->end->ts.type != iter->var->ts.type)
5269 gfc_convert_type (iter->end, &iter->var->ts, 2);
5271 if (iter->step->ts.kind != iter->var->ts.kind
5272 || iter->step->ts.type != iter->var->ts.type)
5273 gfc_convert_type (iter->step, &iter->var->ts, 2);
5275 if (iter->start->expr_type == EXPR_CONSTANT
5276 && iter->end->expr_type == EXPR_CONSTANT
5277 && iter->step->expr_type == EXPR_CONSTANT)
5280 if (iter->start->ts.type == BT_INTEGER)
5282 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5283 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5287 sgn = mpfr_sgn (iter->step->value.real);
5288 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5290 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5291 gfc_warning ("DO loop at %L will be executed zero times",
5292 &iter->step->where);
5299 /* Traversal function for find_forall_index. f == 2 signals that
5300 that variable itself is not to be checked - only the references. */
5303 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5305 if (expr->expr_type != EXPR_VARIABLE)
5308 /* A scalar assignment */
5309 if (!expr->ref || *f == 1)
5311 if (expr->symtree->n.sym == sym)
5323 /* Check whether the FORALL index appears in the expression or not.
5324 Returns SUCCESS if SYM is found in EXPR. */
5327 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5329 if (gfc_traverse_expr (expr, sym, forall_index, f))
5336 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5337 to be a scalar INTEGER variable. The subscripts and stride are scalar
5338 INTEGERs, and if stride is a constant it must be nonzero.
5339 Furthermore "A subscript or stride in a forall-triplet-spec shall
5340 not contain a reference to any index-name in the
5341 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5344 resolve_forall_iterators (gfc_forall_iterator *it)
5346 gfc_forall_iterator *iter, *iter2;
5348 for (iter = it; iter; iter = iter->next)
5350 if (gfc_resolve_expr (iter->var) == SUCCESS
5351 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5352 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5355 if (gfc_resolve_expr (iter->start) == SUCCESS
5356 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5357 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5358 &iter->start->where);
5359 if (iter->var->ts.kind != iter->start->ts.kind)
5360 gfc_convert_type (iter->start, &iter->var->ts, 2);
5362 if (gfc_resolve_expr (iter->end) == SUCCESS
5363 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5364 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5366 if (iter->var->ts.kind != iter->end->ts.kind)
5367 gfc_convert_type (iter->end, &iter->var->ts, 2);
5369 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5371 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5372 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5373 &iter->stride->where, "INTEGER");
5375 if (iter->stride->expr_type == EXPR_CONSTANT
5376 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5377 gfc_error ("FORALL stride expression at %L cannot be zero",
5378 &iter->stride->where);
5380 if (iter->var->ts.kind != iter->stride->ts.kind)
5381 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5384 for (iter = it; iter; iter = iter->next)
5385 for (iter2 = iter; iter2; iter2 = iter2->next)
5387 if (find_forall_index (iter2->start,
5388 iter->var->symtree->n.sym, 0) == SUCCESS
5389 || find_forall_index (iter2->end,
5390 iter->var->symtree->n.sym, 0) == SUCCESS
5391 || find_forall_index (iter2->stride,
5392 iter->var->symtree->n.sym, 0) == SUCCESS)
5393 gfc_error ("FORALL index '%s' may not appear in triplet "
5394 "specification at %L", iter->var->symtree->name,
5395 &iter2->start->where);
5400 /* Given a pointer to a symbol that is a derived type, see if it's
5401 inaccessible, i.e. if it's defined in another module and the components are
5402 PRIVATE. The search is recursive if necessary. Returns zero if no
5403 inaccessible components are found, nonzero otherwise. */
5406 derived_inaccessible (gfc_symbol *sym)
5410 if (sym->attr.use_assoc && sym->attr.private_comp)
5413 for (c = sym->components; c; c = c->next)
5415 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
5423 /* Resolve the argument of a deallocate expression. The expression must be
5424 a pointer or a full array. */
5427 resolve_deallocate_expr (gfc_expr *e)
5429 symbol_attribute attr;
5430 int allocatable, pointer, check_intent_in;
5433 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5434 check_intent_in = 1;
5436 if (gfc_resolve_expr (e) == FAILURE)
5439 if (e->expr_type != EXPR_VARIABLE)
5442 allocatable = e->symtree->n.sym->attr.allocatable;
5443 pointer = e->symtree->n.sym->attr.pointer;
5444 for (ref = e->ref; ref; ref = ref->next)
5447 check_intent_in = 0;
5452 if (ref->u.ar.type != AR_FULL)
5457 allocatable = (ref->u.c.component->as != NULL
5458 && ref->u.c.component->as->type == AS_DEFERRED);
5459 pointer = ref->u.c.component->attr.pointer;
5468 attr = gfc_expr_attr (e);
5470 if (allocatable == 0 && attr.pointer == 0)
5473 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5478 && e->symtree->n.sym->attr.intent == INTENT_IN)
5480 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5481 e->symtree->n.sym->name, &e->where);
5489 /* Returns true if the expression e contains a reference to the symbol sym. */
5491 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5493 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
5500 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
5502 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
5506 /* Given the expression node e for an allocatable/pointer of derived type to be
5507 allocated, get the expression node to be initialized afterwards (needed for
5508 derived types with default initializers, and derived types with allocatable
5509 components that need nullification.) */
5512 expr_to_initialize (gfc_expr *e)
5518 result = gfc_copy_expr (e);
5520 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
5521 for (ref = result->ref; ref; ref = ref->next)
5522 if (ref->type == REF_ARRAY && ref->next == NULL)
5524 ref->u.ar.type = AR_FULL;
5526 for (i = 0; i < ref->u.ar.dimen; i++)
5527 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
5529 result->rank = ref->u.ar.dimen;
5537 /* Resolve the expression in an ALLOCATE statement, doing the additional
5538 checks to see whether the expression is OK or not. The expression must
5539 have a trailing array reference that gives the size of the array. */
5542 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
5544 int i, pointer, allocatable, dimension, check_intent_in;
5545 symbol_attribute attr;
5546 gfc_ref *ref, *ref2;
5553 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5554 check_intent_in = 1;
5556 if (gfc_resolve_expr (e) == FAILURE)
5559 /* Make sure the expression is allocatable or a pointer. If it is
5560 pointer, the next-to-last reference must be a pointer. */
5564 if (e->expr_type != EXPR_VARIABLE)
5567 attr = gfc_expr_attr (e);
5568 pointer = attr.pointer;
5569 dimension = attr.dimension;
5573 allocatable = e->symtree->n.sym->attr.allocatable;
5574 pointer = e->symtree->n.sym->attr.pointer;
5575 dimension = e->symtree->n.sym->attr.dimension;
5577 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
5580 check_intent_in = 0;
5585 if (ref->next != NULL)
5590 allocatable = (ref->u.c.component->as != NULL
5591 && ref->u.c.component->as->type == AS_DEFERRED);
5593 pointer = ref->u.c.component->attr.pointer;
5594 dimension = ref->u.c.component->attr.dimension;
5605 if (allocatable == 0 && pointer == 0)
5607 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5613 && e->symtree->n.sym->attr.intent == INTENT_IN)
5615 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
5616 e->symtree->n.sym->name, &e->where);
5620 /* Add default initializer for those derived types that need them. */
5621 if (e->ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&e->ts)))
5623 init_st = gfc_get_code ();
5624 init_st->loc = code->loc;
5625 init_st->op = EXEC_INIT_ASSIGN;
5626 init_st->expr1 = expr_to_initialize (e);
5627 init_st->expr2 = init_e;
5628 init_st->next = code->next;
5629 code->next = init_st;
5632 if (pointer && dimension == 0)
5635 /* Make sure the next-to-last reference node is an array specification. */
5637 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
5639 gfc_error ("Array specification required in ALLOCATE statement "
5640 "at %L", &e->where);
5644 /* Make sure that the array section reference makes sense in the
5645 context of an ALLOCATE specification. */
5649 for (i = 0; i < ar->dimen; i++)
5651 if (ref2->u.ar.type == AR_ELEMENT)
5654 switch (ar->dimen_type[i])
5660 if (ar->start[i] != NULL
5661 && ar->end[i] != NULL
5662 && ar->stride[i] == NULL)
5665 /* Fall Through... */
5669 gfc_error ("Bad array specification in ALLOCATE statement at %L",
5676 for (a = code->ext.alloc_list; a; a = a->next)
5678 sym = a->expr->symtree->n.sym;
5680 /* TODO - check derived type components. */
5681 if (sym->ts.type == BT_DERIVED)
5684 if ((ar->start[i] != NULL
5685 && gfc_find_sym_in_expr (sym, ar->start[i]))
5686 || (ar->end[i] != NULL
5687 && gfc_find_sym_in_expr (sym, ar->end[i])))
5689 gfc_error ("'%s' must not appear in the array specification at "
5690 "%L in the same ALLOCATE statement where it is "
5691 "itself allocated", sym->name, &ar->where);
5701 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
5703 gfc_expr *stat, *errmsg, *pe, *qe;
5704 gfc_alloc *a, *p, *q;
5706 stat = code->expr1 ? code->expr1 : NULL;
5708 errmsg = code->expr2 ? code->expr2 : NULL;
5710 /* Check the stat variable. */
5713 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
5714 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
5715 stat->symtree->n.sym->name, &stat->where);
5717 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
5718 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
5721 if (stat->ts.type != BT_INTEGER
5722 && !(stat->ref && (stat->ref->type == REF_ARRAY
5723 || stat->ref->type == REF_COMPONENT)))
5724 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
5725 "variable", &stat->where);
5727 for (p = code->ext.alloc_list; p; p = p->next)
5728 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
5729 gfc_error ("Stat-variable at %L shall not be %sd within "
5730 "the same %s statement", &stat->where, fcn, fcn);
5733 /* Check the errmsg variable. */
5737 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
5740 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
5741 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
5742 errmsg->symtree->n.sym->name, &errmsg->where);
5744 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
5745 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
5748 if (errmsg->ts.type != BT_CHARACTER
5750 && (errmsg->ref->type == REF_ARRAY
5751 || errmsg->ref->type == REF_COMPONENT)))
5752 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
5753 "variable", &errmsg->where);
5755 for (p = code->ext.alloc_list; p; p = p->next)
5756 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
5757 gfc_error ("Errmsg-variable at %L shall not be %sd within "
5758 "the same %s statement", &errmsg->where, fcn, fcn);
5761 /* Check that an allocate-object appears only once in the statement.
5762 FIXME: Checking derived types is disabled. */
5763 for (p = code->ext.alloc_list; p; p = p->next)
5766 if ((pe->ref && pe->ref->type != REF_COMPONENT)
5767 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
5769 for (q = p->next; q; q = q->next)
5772 if ((qe->ref && qe->ref->type != REF_COMPONENT)
5773 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
5774 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
5775 gfc_error ("Allocate-object at %L also appears at %L",
5776 &pe->where, &qe->where);
5781 if (strcmp (fcn, "ALLOCATE") == 0)
5783 for (a = code->ext.alloc_list; a; a = a->next)
5784 resolve_allocate_expr (a->expr, code);
5788 for (a = code->ext.alloc_list; a; a = a->next)
5789 resolve_deallocate_expr (a->expr);
5794 /************ SELECT CASE resolution subroutines ************/
5796 /* Callback function for our mergesort variant. Determines interval
5797 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
5798 op1 > op2. Assumes we're not dealing with the default case.
5799 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
5800 There are nine situations to check. */
5803 compare_cases (const gfc_case *op1, const gfc_case *op2)
5807 if (op1->low == NULL) /* op1 = (:L) */
5809 /* op2 = (:N), so overlap. */
5811 /* op2 = (M:) or (M:N), L < M */
5812 if (op2->low != NULL
5813 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5816 else if (op1->high == NULL) /* op1 = (K:) */
5818 /* op2 = (M:), so overlap. */
5820 /* op2 = (:N) or (M:N), K > N */
5821 if (op2->high != NULL
5822 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5825 else /* op1 = (K:L) */
5827 if (op2->low == NULL) /* op2 = (:N), K > N */
5828 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5830 else if (op2->high == NULL) /* op2 = (M:), L < M */
5831 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5833 else /* op2 = (M:N) */
5837 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5840 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5849 /* Merge-sort a double linked case list, detecting overlap in the
5850 process. LIST is the head of the double linked case list before it
5851 is sorted. Returns the head of the sorted list if we don't see any
5852 overlap, or NULL otherwise. */
5855 check_case_overlap (gfc_case *list)
5857 gfc_case *p, *q, *e, *tail;
5858 int insize, nmerges, psize, qsize, cmp, overlap_seen;
5860 /* If the passed list was empty, return immediately. */
5867 /* Loop unconditionally. The only exit from this loop is a return
5868 statement, when we've finished sorting the case list. */
5875 /* Count the number of merges we do in this pass. */
5878 /* Loop while there exists a merge to be done. */
5883 /* Count this merge. */
5886 /* Cut the list in two pieces by stepping INSIZE places
5887 forward in the list, starting from P. */
5890 for (i = 0; i < insize; i++)
5899 /* Now we have two lists. Merge them! */
5900 while (psize > 0 || (qsize > 0 && q != NULL))
5902 /* See from which the next case to merge comes from. */
5905 /* P is empty so the next case must come from Q. */
5910 else if (qsize == 0 || q == NULL)
5919 cmp = compare_cases (p, q);
5922 /* The whole case range for P is less than the
5930 /* The whole case range for Q is greater than
5931 the case range for P. */
5938 /* The cases overlap, or they are the same
5939 element in the list. Either way, we must
5940 issue an error and get the next case from P. */
5941 /* FIXME: Sort P and Q by line number. */
5942 gfc_error ("CASE label at %L overlaps with CASE "
5943 "label at %L", &p->where, &q->where);
5951 /* Add the next element to the merged list. */
5960 /* P has now stepped INSIZE places along, and so has Q. So
5961 they're the same. */
5966 /* If we have done only one merge or none at all, we've
5967 finished sorting the cases. */
5976 /* Otherwise repeat, merging lists twice the size. */
5982 /* Check to see if an expression is suitable for use in a CASE statement.
5983 Makes sure that all case expressions are scalar constants of the same
5984 type. Return FAILURE if anything is wrong. */
5987 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
5989 if (e == NULL) return SUCCESS;
5991 if (e->ts.type != case_expr->ts.type)
5993 gfc_error ("Expression in CASE statement at %L must be of type %s",
5994 &e->where, gfc_basic_typename (case_expr->ts.type));
5998 /* C805 (R808) For a given case-construct, each case-value shall be of
5999 the same type as case-expr. For character type, length differences
6000 are allowed, but the kind type parameters shall be the same. */
6002 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6004 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6005 &e->where, case_expr->ts.kind);
6009 /* Convert the case value kind to that of case expression kind, if needed.
6010 FIXME: Should a warning be issued? */
6011 if (e->ts.kind != case_expr->ts.kind)
6012 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6016 gfc_error ("Expression in CASE statement at %L must be scalar",
6025 /* Given a completely parsed select statement, we:
6027 - Validate all expressions and code within the SELECT.
6028 - Make sure that the selection expression is not of the wrong type.
6029 - Make sure that no case ranges overlap.
6030 - Eliminate unreachable cases and unreachable code resulting from
6031 removing case labels.
6033 The standard does allow unreachable cases, e.g. CASE (5:3). But
6034 they are a hassle for code generation, and to prevent that, we just
6035 cut them out here. This is not necessary for overlapping cases
6036 because they are illegal and we never even try to generate code.
6038 We have the additional caveat that a SELECT construct could have
6039 been a computed GOTO in the source code. Fortunately we can fairly
6040 easily work around that here: The case_expr for a "real" SELECT CASE
6041 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6042 we have to do is make sure that the case_expr is a scalar integer
6046 resolve_select (gfc_code *code)
6049 gfc_expr *case_expr;
6050 gfc_case *cp, *default_case, *tail, *head;
6051 int seen_unreachable;
6057 if (code->expr1 == NULL)
6059 /* This was actually a computed GOTO statement. */
6060 case_expr = code->expr2;
6061 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6062 gfc_error ("Selection expression in computed GOTO statement "
6063 "at %L must be a scalar integer expression",
6066 /* Further checking is not necessary because this SELECT was built
6067 by the compiler, so it should always be OK. Just move the
6068 case_expr from expr2 to expr so that we can handle computed
6069 GOTOs as normal SELECTs from here on. */
6070 code->expr1 = code->expr2;
6075 case_expr = code->expr1;
6077 type = case_expr->ts.type;
6078 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6080 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6081 &case_expr->where, gfc_typename (&case_expr->ts));
6083 /* Punt. Going on here just produce more garbage error messages. */
6087 if (case_expr->rank != 0)
6089 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6090 "expression", &case_expr->where);
6096 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6097 of the SELECT CASE expression and its CASE values. Walk the lists
6098 of case values, and if we find a mismatch, promote case_expr to
6099 the appropriate kind. */
6101 if (type == BT_LOGICAL || type == BT_INTEGER)
6103 for (body = code->block; body; body = body->block)
6105 /* Walk the case label list. */
6106 for (cp = body->ext.case_list; cp; cp = cp->next)
6108 /* Intercept the DEFAULT case. It does not have a kind. */
6109 if (cp->low == NULL && cp->high == NULL)
6112 /* Unreachable case ranges are discarded, so ignore. */
6113 if (cp->low != NULL && cp->high != NULL
6114 && cp->low != cp->high
6115 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6118 /* FIXME: Should a warning be issued? */
6120 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6121 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6123 if (cp->high != NULL
6124 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6125 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6130 /* Assume there is no DEFAULT case. */
6131 default_case = NULL;
6136 for (body = code->block; body; body = body->block)
6138 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6140 seen_unreachable = 0;
6142 /* Walk the case label list, making sure that all case labels
6144 for (cp = body->ext.case_list; cp; cp = cp->next)
6146 /* Count the number of cases in the whole construct. */
6149 /* Intercept the DEFAULT case. */
6150 if (cp->low == NULL && cp->high == NULL)
6152 if (default_case != NULL)
6154 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6155 "by a second DEFAULT CASE at %L",
6156 &default_case->where, &cp->where);
6167 /* Deal with single value cases and case ranges. Errors are
6168 issued from the validation function. */
6169 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
6170 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
6176 if (type == BT_LOGICAL
6177 && ((cp->low == NULL || cp->high == NULL)
6178 || cp->low != cp->high))
6180 gfc_error ("Logical range in CASE statement at %L is not "
6181 "allowed", &cp->low->where);
6186 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
6189 value = cp->low->value.logical == 0 ? 2 : 1;
6190 if (value & seen_logical)
6192 gfc_error ("constant logical value in CASE statement "
6193 "is repeated at %L",
6198 seen_logical |= value;
6201 if (cp->low != NULL && cp->high != NULL
6202 && cp->low != cp->high
6203 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6205 if (gfc_option.warn_surprising)
6206 gfc_warning ("Range specification at %L can never "
6207 "be matched", &cp->where);
6209 cp->unreachable = 1;
6210 seen_unreachable = 1;
6214 /* If the case range can be matched, it can also overlap with
6215 other cases. To make sure it does not, we put it in a
6216 double linked list here. We sort that with a merge sort
6217 later on to detect any overlapping cases. */
6221 head->right = head->left = NULL;
6226 tail->right->left = tail;
6233 /* It there was a failure in the previous case label, give up
6234 for this case label list. Continue with the next block. */
6238 /* See if any case labels that are unreachable have been seen.
6239 If so, we eliminate them. This is a bit of a kludge because
6240 the case lists for a single case statement (label) is a
6241 single forward linked lists. */
6242 if (seen_unreachable)
6244 /* Advance until the first case in the list is reachable. */
6245 while (body->ext.case_list != NULL
6246 && body->ext.case_list->unreachable)
6248 gfc_case *n = body->ext.case_list;
6249 body->ext.case_list = body->ext.case_list->next;
6251 gfc_free_case_list (n);
6254 /* Strip all other unreachable cases. */
6255 if (body->ext.case_list)
6257 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6259 if (cp->next->unreachable)
6261 gfc_case *n = cp->next;
6262 cp->next = cp->next->next;
6264 gfc_free_case_list (n);
6271 /* See if there were overlapping cases. If the check returns NULL,
6272 there was overlap. In that case we don't do anything. If head
6273 is non-NULL, we prepend the DEFAULT case. The sorted list can
6274 then used during code generation for SELECT CASE constructs with
6275 a case expression of a CHARACTER type. */
6278 head = check_case_overlap (head);
6280 /* Prepend the default_case if it is there. */
6281 if (head != NULL && default_case)
6283 default_case->left = NULL;
6284 default_case->right = head;
6285 head->left = default_case;
6289 /* Eliminate dead blocks that may be the result if we've seen
6290 unreachable case labels for a block. */
6291 for (body = code; body && body->block; body = body->block)
6293 if (body->block->ext.case_list == NULL)
6295 /* Cut the unreachable block from the code chain. */
6296 gfc_code *c = body->block;
6297 body->block = c->block;
6299 /* Kill the dead block, but not the blocks below it. */
6301 gfc_free_statements (c);
6305 /* More than two cases is legal but insane for logical selects.
6306 Issue a warning for it. */
6307 if (gfc_option.warn_surprising && type == BT_LOGICAL
6309 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6314 /* Resolve a transfer statement. This is making sure that:
6315 -- a derived type being transferred has only non-pointer components
6316 -- a derived type being transferred doesn't have private components, unless
6317 it's being transferred from the module where the type was defined
6318 -- we're not trying to transfer a whole assumed size array. */
6321 resolve_transfer (gfc_code *code)
6330 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
6333 sym = exp->symtree->n.sym;
6336 /* Go to actual component transferred. */
6337 for (ref = code->expr1->ref; ref; ref = ref->next)
6338 if (ref->type == REF_COMPONENT)
6339 ts = &ref->u.c.component->ts;
6341 if (ts->type == BT_DERIVED)
6343 /* Check that transferred derived type doesn't contain POINTER
6345 if (ts->u.derived->attr.pointer_comp)
6347 gfc_error ("Data transfer element at %L cannot have "
6348 "POINTER components", &code->loc);
6352 if (ts->u.derived->attr.alloc_comp)
6354 gfc_error ("Data transfer element at %L cannot have "
6355 "ALLOCATABLE components", &code->loc);
6359 if (derived_inaccessible (ts->u.derived))
6361 gfc_error ("Data transfer element at %L cannot have "
6362 "PRIVATE components",&code->loc);
6367 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
6368 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
6370 gfc_error ("Data transfer element at %L cannot be a full reference to "
6371 "an assumed-size array", &code->loc);
6377 /*********** Toplevel code resolution subroutines ***********/
6379 /* Find the set of labels that are reachable from this block. We also
6380 record the last statement in each block. */
6383 find_reachable_labels (gfc_code *block)
6390 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
6392 /* Collect labels in this block. We don't keep those corresponding
6393 to END {IF|SELECT}, these are checked in resolve_branch by going
6394 up through the code_stack. */
6395 for (c = block; c; c = c->next)
6397 if (c->here && c->op != EXEC_END_BLOCK)
6398 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
6401 /* Merge with labels from parent block. */
6404 gcc_assert (cs_base->prev->reachable_labels);
6405 bitmap_ior_into (cs_base->reachable_labels,
6406 cs_base->prev->reachable_labels);
6410 /* Given a branch to a label, see if the branch is conforming.
6411 The code node describes where the branch is located. */
6414 resolve_branch (gfc_st_label *label, gfc_code *code)
6421 /* Step one: is this a valid branching target? */
6423 if (label->defined == ST_LABEL_UNKNOWN)
6425 gfc_error ("Label %d referenced at %L is never defined", label->value,
6430 if (label->defined != ST_LABEL_TARGET)
6432 gfc_error ("Statement at %L is not a valid branch target statement "
6433 "for the branch statement at %L", &label->where, &code->loc);
6437 /* Step two: make sure this branch is not a branch to itself ;-) */
6439 if (code->here == label)
6441 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
6445 /* Step three: See if the label is in the same block as the
6446 branching statement. The hard work has been done by setting up
6447 the bitmap reachable_labels. */
6449 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
6452 /* Step four: If we haven't found the label in the bitmap, it may
6453 still be the label of the END of the enclosing block, in which
6454 case we find it by going up the code_stack. */
6456 for (stack = cs_base; stack; stack = stack->prev)
6457 if (stack->current->next && stack->current->next->here == label)
6462 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
6466 /* The label is not in an enclosing block, so illegal. This was
6467 allowed in Fortran 66, so we allow it as extension. No
6468 further checks are necessary in this case. */
6469 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
6470 "as the GOTO statement at %L", &label->where,
6476 /* Check whether EXPR1 has the same shape as EXPR2. */
6479 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
6481 mpz_t shape[GFC_MAX_DIMENSIONS];
6482 mpz_t shape2[GFC_MAX_DIMENSIONS];
6483 gfc_try result = FAILURE;
6486 /* Compare the rank. */
6487 if (expr1->rank != expr2->rank)
6490 /* Compare the size of each dimension. */
6491 for (i=0; i<expr1->rank; i++)
6493 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
6496 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
6499 if (mpz_cmp (shape[i], shape2[i]))
6503 /* When either of the two expression is an assumed size array, we
6504 ignore the comparison of dimension sizes. */
6509 for (i--; i >= 0; i--)
6511 mpz_clear (shape[i]);
6512 mpz_clear (shape2[i]);
6518 /* Check whether a WHERE assignment target or a WHERE mask expression
6519 has the same shape as the outmost WHERE mask expression. */
6522 resolve_where (gfc_code *code, gfc_expr *mask)
6528 cblock = code->block;
6530 /* Store the first WHERE mask-expr of the WHERE statement or construct.
6531 In case of nested WHERE, only the outmost one is stored. */
6532 if (mask == NULL) /* outmost WHERE */
6534 else /* inner WHERE */
6541 /* Check if the mask-expr has a consistent shape with the
6542 outmost WHERE mask-expr. */
6543 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
6544 gfc_error ("WHERE mask at %L has inconsistent shape",
6545 &cblock->expr1->where);
6548 /* the assignment statement of a WHERE statement, or the first
6549 statement in where-body-construct of a WHERE construct */
6550 cnext = cblock->next;
6555 /* WHERE assignment statement */
6558 /* Check shape consistent for WHERE assignment target. */
6559 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
6560 gfc_error ("WHERE assignment target at %L has "
6561 "inconsistent shape", &cnext->expr1->where);
6565 case EXEC_ASSIGN_CALL:
6566 resolve_call (cnext);
6567 if (!cnext->resolved_sym->attr.elemental)
6568 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6569 &cnext->ext.actual->expr->where);
6572 /* WHERE or WHERE construct is part of a where-body-construct */
6574 resolve_where (cnext, e);
6578 gfc_error ("Unsupported statement inside WHERE at %L",
6581 /* the next statement within the same where-body-construct */
6582 cnext = cnext->next;
6584 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6585 cblock = cblock->block;
6590 /* Resolve assignment in FORALL construct.
6591 NVAR is the number of FORALL index variables, and VAR_EXPR records the
6592 FORALL index variables. */
6595 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
6599 for (n = 0; n < nvar; n++)
6601 gfc_symbol *forall_index;
6603 forall_index = var_expr[n]->symtree->n.sym;
6605 /* Check whether the assignment target is one of the FORALL index
6607 if ((code->expr1->expr_type == EXPR_VARIABLE)
6608 && (code->expr1->symtree->n.sym == forall_index))
6609 gfc_error ("Assignment to a FORALL index variable at %L",
6610 &code->expr1->where);
6613 /* If one of the FORALL index variables doesn't appear in the
6614 assignment variable, then there could be a many-to-one
6615 assignment. Emit a warning rather than an error because the
6616 mask could be resolving this problem. */
6617 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
6618 gfc_warning ("The FORALL with index '%s' is not used on the "
6619 "left side of the assignment at %L and so might "
6620 "cause multiple assignment to this object",
6621 var_expr[n]->symtree->name, &code->expr1->where);
6627 /* Resolve WHERE statement in FORALL construct. */
6630 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
6631 gfc_expr **var_expr)
6636 cblock = code->block;
6639 /* the assignment statement of a WHERE statement, or the first
6640 statement in where-body-construct of a WHERE construct */
6641 cnext = cblock->next;
6646 /* WHERE assignment statement */
6648 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
6651 /* WHERE operator assignment statement */
6652 case EXEC_ASSIGN_CALL:
6653 resolve_call (cnext);
6654 if (!cnext->resolved_sym->attr.elemental)
6655 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6656 &cnext->ext.actual->expr->where);
6659 /* WHERE or WHERE construct is part of a where-body-construct */
6661 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
6665 gfc_error ("Unsupported statement inside WHERE at %L",
6668 /* the next statement within the same where-body-construct */
6669 cnext = cnext->next;
6671 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6672 cblock = cblock->block;
6677 /* Traverse the FORALL body to check whether the following errors exist:
6678 1. For assignment, check if a many-to-one assignment happens.
6679 2. For WHERE statement, check the WHERE body to see if there is any
6680 many-to-one assignment. */
6683 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
6687 c = code->block->next;
6693 case EXEC_POINTER_ASSIGN:
6694 gfc_resolve_assign_in_forall (c, nvar, var_expr);
6697 case EXEC_ASSIGN_CALL:
6701 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
6702 there is no need to handle it here. */
6706 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
6711 /* The next statement in the FORALL body. */
6717 /* Counts the number of iterators needed inside a forall construct, including
6718 nested forall constructs. This is used to allocate the needed memory
6719 in gfc_resolve_forall. */
6722 gfc_count_forall_iterators (gfc_code *code)
6724 int max_iters, sub_iters, current_iters;
6725 gfc_forall_iterator *fa;
6727 gcc_assert(code->op == EXEC_FORALL);
6731 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6734 code = code->block->next;
6738 if (code->op == EXEC_FORALL)
6740 sub_iters = gfc_count_forall_iterators (code);
6741 if (sub_iters > max_iters)
6742 max_iters = sub_iters;
6747 return current_iters + max_iters;
6751 /* Given a FORALL construct, first resolve the FORALL iterator, then call
6752 gfc_resolve_forall_body to resolve the FORALL body. */
6755 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
6757 static gfc_expr **var_expr;
6758 static int total_var = 0;
6759 static int nvar = 0;
6761 gfc_forall_iterator *fa;
6766 /* Start to resolve a FORALL construct */
6767 if (forall_save == 0)
6769 /* Count the total number of FORALL index in the nested FORALL
6770 construct in order to allocate the VAR_EXPR with proper size. */
6771 total_var = gfc_count_forall_iterators (code);
6773 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
6774 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
6777 /* The information about FORALL iterator, including FORALL index start, end
6778 and stride. The FORALL index can not appear in start, end or stride. */
6779 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6781 /* Check if any outer FORALL index name is the same as the current
6783 for (i = 0; i < nvar; i++)
6785 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
6787 gfc_error ("An outer FORALL construct already has an index "
6788 "with this name %L", &fa->var->where);
6792 /* Record the current FORALL index. */
6793 var_expr[nvar] = gfc_copy_expr (fa->var);
6797 /* No memory leak. */
6798 gcc_assert (nvar <= total_var);
6801 /* Resolve the FORALL body. */
6802 gfc_resolve_forall_body (code, nvar, var_expr);
6804 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
6805 gfc_resolve_blocks (code->block, ns);
6809 /* Free only the VAR_EXPRs allocated in this frame. */
6810 for (i = nvar; i < tmp; i++)
6811 gfc_free_expr (var_expr[i]);
6815 /* We are in the outermost FORALL construct. */
6816 gcc_assert (forall_save == 0);
6818 /* VAR_EXPR is not needed any more. */
6819 gfc_free (var_expr);
6825 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL ,GOTO and
6828 static void resolve_code (gfc_code *, gfc_namespace *);
6831 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
6835 for (; b; b = b->block)
6837 t = gfc_resolve_expr (b->expr1);
6838 if (gfc_resolve_expr (b->expr2) == FAILURE)
6844 if (t == SUCCESS && b->expr1 != NULL
6845 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
6846 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
6853 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
6854 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
6859 resolve_branch (b->label1, b);
6872 case EXEC_OMP_ATOMIC:
6873 case EXEC_OMP_CRITICAL:
6875 case EXEC_OMP_MASTER:
6876 case EXEC_OMP_ORDERED:
6877 case EXEC_OMP_PARALLEL:
6878 case EXEC_OMP_PARALLEL_DO:
6879 case EXEC_OMP_PARALLEL_SECTIONS:
6880 case EXEC_OMP_PARALLEL_WORKSHARE:
6881 case EXEC_OMP_SECTIONS:
6882 case EXEC_OMP_SINGLE:
6884 case EXEC_OMP_TASKWAIT:
6885 case EXEC_OMP_WORKSHARE:
6889 gfc_internal_error ("resolve_block(): Bad block type");
6892 resolve_code (b->next, ns);
6897 /* Does everything to resolve an ordinary assignment. Returns true
6898 if this is an interface assignment. */
6900 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
6910 if (gfc_extend_assign (code, ns) == SUCCESS)
6912 lhs = code->ext.actual->expr;
6913 rhs = code->ext.actual->next->expr;
6914 if (gfc_pure (NULL) && !gfc_pure (code->symtree->n.sym))
6916 gfc_error ("Subroutine '%s' called instead of assignment at "
6917 "%L must be PURE", code->symtree->n.sym->name,
6922 /* Make a temporary rhs when there is a default initializer
6923 and rhs is the same symbol as the lhs. */
6924 if (rhs->expr_type == EXPR_VARIABLE
6925 && rhs->symtree->n.sym->ts.type == BT_DERIVED
6926 && has_default_initializer (rhs->symtree->n.sym->ts.u.derived)
6927 && (lhs->symtree->n.sym == rhs->symtree->n.sym))
6928 code->ext.actual->next->expr = gfc_get_parentheses (rhs);
6937 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
6938 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
6939 &code->loc) == FAILURE)
6942 /* Handle the case of a BOZ literal on the RHS. */
6943 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
6946 if (gfc_option.warn_surprising)
6947 gfc_warning ("BOZ literal at %L is bitwise transferred "
6948 "non-integer symbol '%s'", &code->loc,
6949 lhs->symtree->n.sym->name);
6951 if (!gfc_convert_boz (rhs, &lhs->ts))
6953 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
6955 if (rc == ARITH_UNDERFLOW)
6956 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
6957 ". This check can be disabled with the option "
6958 "-fno-range-check", &rhs->where);
6959 else if (rc == ARITH_OVERFLOW)
6960 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
6961 ". This check can be disabled with the option "
6962 "-fno-range-check", &rhs->where);
6963 else if (rc == ARITH_NAN)
6964 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
6965 ". This check can be disabled with the option "
6966 "-fno-range-check", &rhs->where);
6972 if (lhs->ts.type == BT_CHARACTER
6973 && gfc_option.warn_character_truncation)
6975 if (lhs->ts.u.cl != NULL
6976 && lhs->ts.u.cl->length != NULL
6977 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
6978 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
6980 if (rhs->expr_type == EXPR_CONSTANT)
6981 rlen = rhs->value.character.length;
6983 else if (rhs->ts.u.cl != NULL
6984 && rhs->ts.u.cl->length != NULL
6985 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
6986 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
6988 if (rlen && llen && rlen > llen)
6989 gfc_warning_now ("CHARACTER expression will be truncated "
6990 "in assignment (%d/%d) at %L",
6991 llen, rlen, &code->loc);
6994 /* Ensure that a vector index expression for the lvalue is evaluated
6995 to a temporary if the lvalue symbol is referenced in it. */
6998 for (ref = lhs->ref; ref; ref= ref->next)
6999 if (ref->type == REF_ARRAY)
7001 for (n = 0; n < ref->u.ar.dimen; n++)
7002 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
7003 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
7004 ref->u.ar.start[n]))
7006 = gfc_get_parentheses (ref->u.ar.start[n]);
7010 if (gfc_pure (NULL))
7012 if (gfc_impure_variable (lhs->symtree->n.sym))
7014 gfc_error ("Cannot assign to variable '%s' in PURE "
7016 lhs->symtree->n.sym->name,
7021 if (lhs->ts.type == BT_DERIVED
7022 && lhs->expr_type == EXPR_VARIABLE
7023 && lhs->ts.u.derived->attr.pointer_comp
7024 && gfc_impure_variable (rhs->symtree->n.sym))
7026 gfc_error ("The impure variable at %L is assigned to "
7027 "a derived type variable with a POINTER "
7028 "component in a PURE procedure (12.6)",
7034 gfc_check_assign (lhs, rhs, 1);
7038 /* Given a block of code, recursively resolve everything pointed to by this
7042 resolve_code (gfc_code *code, gfc_namespace *ns)
7044 int omp_workshare_save;
7049 frame.prev = cs_base;
7053 find_reachable_labels (code);
7055 for (; code; code = code->next)
7057 frame.current = code;
7058 forall_save = forall_flag;
7060 if (code->op == EXEC_FORALL)
7063 gfc_resolve_forall (code, ns, forall_save);
7066 else if (code->block)
7068 omp_workshare_save = -1;
7071 case EXEC_OMP_PARALLEL_WORKSHARE:
7072 omp_workshare_save = omp_workshare_flag;
7073 omp_workshare_flag = 1;
7074 gfc_resolve_omp_parallel_blocks (code, ns);
7076 case EXEC_OMP_PARALLEL:
7077 case EXEC_OMP_PARALLEL_DO:
7078 case EXEC_OMP_PARALLEL_SECTIONS:
7080 omp_workshare_save = omp_workshare_flag;
7081 omp_workshare_flag = 0;
7082 gfc_resolve_omp_parallel_blocks (code, ns);
7085 gfc_resolve_omp_do_blocks (code, ns);
7087 case EXEC_OMP_WORKSHARE:
7088 omp_workshare_save = omp_workshare_flag;
7089 omp_workshare_flag = 1;
7092 gfc_resolve_blocks (code->block, ns);
7096 if (omp_workshare_save != -1)
7097 omp_workshare_flag = omp_workshare_save;
7101 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
7102 t = gfc_resolve_expr (code->expr1);
7103 forall_flag = forall_save;
7105 if (gfc_resolve_expr (code->expr2) == FAILURE)
7111 case EXEC_END_BLOCK:
7121 /* Keep track of which entry we are up to. */
7122 current_entry_id = code->ext.entry->id;
7126 resolve_where (code, NULL);
7130 if (code->expr1 != NULL)
7132 if (code->expr1->ts.type != BT_INTEGER)
7133 gfc_error ("ASSIGNED GOTO statement at %L requires an "
7134 "INTEGER variable", &code->expr1->where);
7135 else if (code->expr1->symtree->n.sym->attr.assign != 1)
7136 gfc_error ("Variable '%s' has not been assigned a target "
7137 "label at %L", code->expr1->symtree->n.sym->name,
7138 &code->expr1->where);
7141 resolve_branch (code->label1, code);
7145 if (code->expr1 != NULL
7146 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
7147 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
7148 "INTEGER return specifier", &code->expr1->where);
7151 case EXEC_INIT_ASSIGN:
7152 case EXEC_END_PROCEDURE:
7159 if (resolve_ordinary_assign (code, ns))
7164 case EXEC_LABEL_ASSIGN:
7165 if (code->label1->defined == ST_LABEL_UNKNOWN)
7166 gfc_error ("Label %d referenced at %L is never defined",
7167 code->label1->value, &code->label1->where);
7169 && (code->expr1->expr_type != EXPR_VARIABLE
7170 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
7171 || code->expr1->symtree->n.sym->ts.kind
7172 != gfc_default_integer_kind
7173 || code->expr1->symtree->n.sym->as != NULL))
7174 gfc_error ("ASSIGN statement at %L requires a scalar "
7175 "default INTEGER variable", &code->expr1->where);
7178 case EXEC_POINTER_ASSIGN:
7182 gfc_check_pointer_assign (code->expr1, code->expr2);
7185 case EXEC_ARITHMETIC_IF:
7187 && code->expr1->ts.type != BT_INTEGER
7188 && code->expr1->ts.type != BT_REAL)
7189 gfc_error ("Arithmetic IF statement at %L requires a numeric "
7190 "expression", &code->expr1->where);
7192 resolve_branch (code->label1, code);
7193 resolve_branch (code->label2, code);
7194 resolve_branch (code->label3, code);
7198 if (t == SUCCESS && code->expr1 != NULL
7199 && (code->expr1->ts.type != BT_LOGICAL
7200 || code->expr1->rank != 0))
7201 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7202 &code->expr1->where);
7207 resolve_call (code);
7211 resolve_typebound_call (code);
7215 resolve_ppc_call (code);
7219 /* Select is complicated. Also, a SELECT construct could be
7220 a transformed computed GOTO. */
7221 resolve_select (code);
7225 if (code->ext.iterator != NULL)
7227 gfc_iterator *iter = code->ext.iterator;
7228 if (gfc_resolve_iterator (iter, true) != FAILURE)
7229 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
7234 if (code->expr1 == NULL)
7235 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
7237 && (code->expr1->rank != 0
7238 || code->expr1->ts.type != BT_LOGICAL))
7239 gfc_error ("Exit condition of DO WHILE loop at %L must be "
7240 "a scalar LOGICAL expression", &code->expr1->where);
7245 resolve_allocate_deallocate (code, "ALLOCATE");
7249 case EXEC_DEALLOCATE:
7251 resolve_allocate_deallocate (code, "DEALLOCATE");
7256 if (gfc_resolve_open (code->ext.open) == FAILURE)
7259 resolve_branch (code->ext.open->err, code);
7263 if (gfc_resolve_close (code->ext.close) == FAILURE)
7266 resolve_branch (code->ext.close->err, code);
7269 case EXEC_BACKSPACE:
7273 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
7276 resolve_branch (code->ext.filepos->err, code);
7280 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7283 resolve_branch (code->ext.inquire->err, code);
7287 gcc_assert (code->ext.inquire != NULL);
7288 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7291 resolve_branch (code->ext.inquire->err, code);
7295 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
7298 resolve_branch (code->ext.wait->err, code);
7299 resolve_branch (code->ext.wait->end, code);
7300 resolve_branch (code->ext.wait->eor, code);
7305 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
7308 resolve_branch (code->ext.dt->err, code);
7309 resolve_branch (code->ext.dt->end, code);
7310 resolve_branch (code->ext.dt->eor, code);
7314 resolve_transfer (code);
7318 resolve_forall_iterators (code->ext.forall_iterator);
7320 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
7321 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
7322 "expression", &code->expr1->where);
7325 case EXEC_OMP_ATOMIC:
7326 case EXEC_OMP_BARRIER:
7327 case EXEC_OMP_CRITICAL:
7328 case EXEC_OMP_FLUSH:
7330 case EXEC_OMP_MASTER:
7331 case EXEC_OMP_ORDERED:
7332 case EXEC_OMP_SECTIONS:
7333 case EXEC_OMP_SINGLE:
7334 case EXEC_OMP_TASKWAIT:
7335 case EXEC_OMP_WORKSHARE:
7336 gfc_resolve_omp_directive (code, ns);
7339 case EXEC_OMP_PARALLEL:
7340 case EXEC_OMP_PARALLEL_DO:
7341 case EXEC_OMP_PARALLEL_SECTIONS:
7342 case EXEC_OMP_PARALLEL_WORKSHARE:
7344 omp_workshare_save = omp_workshare_flag;
7345 omp_workshare_flag = 0;
7346 gfc_resolve_omp_directive (code, ns);
7347 omp_workshare_flag = omp_workshare_save;
7351 gfc_internal_error ("resolve_code(): Bad statement code");
7355 cs_base = frame.prev;
7359 /* Resolve initial values and make sure they are compatible with
7363 resolve_values (gfc_symbol *sym)
7365 if (sym->value == NULL)
7368 if (gfc_resolve_expr (sym->value) == FAILURE)
7371 gfc_check_assign_symbol (sym, sym->value);
7375 /* Verify the binding labels for common blocks that are BIND(C). The label
7376 for a BIND(C) common block must be identical in all scoping units in which
7377 the common block is declared. Further, the binding label can not collide
7378 with any other global entity in the program. */
7381 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
7383 if (comm_block_tree->n.common->is_bind_c == 1)
7385 gfc_gsymbol *binding_label_gsym;
7386 gfc_gsymbol *comm_name_gsym;
7388 /* See if a global symbol exists by the common block's name. It may
7389 be NULL if the common block is use-associated. */
7390 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
7391 comm_block_tree->n.common->name);
7392 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
7393 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
7394 "with the global entity '%s' at %L",
7395 comm_block_tree->n.common->binding_label,
7396 comm_block_tree->n.common->name,
7397 &(comm_block_tree->n.common->where),
7398 comm_name_gsym->name, &(comm_name_gsym->where));
7399 else if (comm_name_gsym != NULL
7400 && strcmp (comm_name_gsym->name,
7401 comm_block_tree->n.common->name) == 0)
7403 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
7405 if (comm_name_gsym->binding_label == NULL)
7406 /* No binding label for common block stored yet; save this one. */
7407 comm_name_gsym->binding_label =
7408 comm_block_tree->n.common->binding_label;
7410 if (strcmp (comm_name_gsym->binding_label,
7411 comm_block_tree->n.common->binding_label) != 0)
7413 /* Common block names match but binding labels do not. */
7414 gfc_error ("Binding label '%s' for common block '%s' at %L "
7415 "does not match the binding label '%s' for common "
7417 comm_block_tree->n.common->binding_label,
7418 comm_block_tree->n.common->name,
7419 &(comm_block_tree->n.common->where),
7420 comm_name_gsym->binding_label,
7421 comm_name_gsym->name,
7422 &(comm_name_gsym->where));
7427 /* There is no binding label (NAME="") so we have nothing further to
7428 check and nothing to add as a global symbol for the label. */
7429 if (comm_block_tree->n.common->binding_label[0] == '\0' )
7432 binding_label_gsym =
7433 gfc_find_gsymbol (gfc_gsym_root,
7434 comm_block_tree->n.common->binding_label);
7435 if (binding_label_gsym == NULL)
7437 /* Need to make a global symbol for the binding label to prevent
7438 it from colliding with another. */
7439 binding_label_gsym =
7440 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
7441 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
7442 binding_label_gsym->type = GSYM_COMMON;
7446 /* If comm_name_gsym is NULL, the name common block is use
7447 associated and the name could be colliding. */
7448 if (binding_label_gsym->type != GSYM_COMMON)
7449 gfc_error ("Binding label '%s' for common block '%s' at %L "
7450 "collides with the global entity '%s' at %L",
7451 comm_block_tree->n.common->binding_label,
7452 comm_block_tree->n.common->name,
7453 &(comm_block_tree->n.common->where),
7454 binding_label_gsym->name,
7455 &(binding_label_gsym->where));
7456 else if (comm_name_gsym != NULL
7457 && (strcmp (binding_label_gsym->name,
7458 comm_name_gsym->binding_label) != 0)
7459 && (strcmp (binding_label_gsym->sym_name,
7460 comm_name_gsym->name) != 0))
7461 gfc_error ("Binding label '%s' for common block '%s' at %L "
7462 "collides with global entity '%s' at %L",
7463 binding_label_gsym->name, binding_label_gsym->sym_name,
7464 &(comm_block_tree->n.common->where),
7465 comm_name_gsym->name, &(comm_name_gsym->where));
7473 /* Verify any BIND(C) derived types in the namespace so we can report errors
7474 for them once, rather than for each variable declared of that type. */
7477 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
7479 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
7480 && derived_sym->attr.is_bind_c == 1)
7481 verify_bind_c_derived_type (derived_sym);
7487 /* Verify that any binding labels used in a given namespace do not collide
7488 with the names or binding labels of any global symbols. */
7491 gfc_verify_binding_labels (gfc_symbol *sym)
7495 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
7496 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
7498 gfc_gsymbol *bind_c_sym;
7500 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
7501 if (bind_c_sym != NULL
7502 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
7504 if (sym->attr.if_source == IFSRC_DECL
7505 && (bind_c_sym->type != GSYM_SUBROUTINE
7506 && bind_c_sym->type != GSYM_FUNCTION)
7507 && ((sym->attr.contained == 1
7508 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
7509 || (sym->attr.use_assoc == 1
7510 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
7512 /* Make sure global procedures don't collide with anything. */
7513 gfc_error ("Binding label '%s' at %L collides with the global "
7514 "entity '%s' at %L", sym->binding_label,
7515 &(sym->declared_at), bind_c_sym->name,
7516 &(bind_c_sym->where));
7519 else if (sym->attr.contained == 0
7520 && (sym->attr.if_source == IFSRC_IFBODY
7521 && sym->attr.flavor == FL_PROCEDURE)
7522 && (bind_c_sym->sym_name != NULL
7523 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
7525 /* Make sure procedures in interface bodies don't collide. */
7526 gfc_error ("Binding label '%s' in interface body at %L collides "
7527 "with the global entity '%s' at %L",
7529 &(sym->declared_at), bind_c_sym->name,
7530 &(bind_c_sym->where));
7533 else if (sym->attr.contained == 0
7534 && sym->attr.if_source == IFSRC_UNKNOWN)
7535 if ((sym->attr.use_assoc && bind_c_sym->mod_name
7536 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
7537 || sym->attr.use_assoc == 0)
7539 gfc_error ("Binding label '%s' at %L collides with global "
7540 "entity '%s' at %L", sym->binding_label,
7541 &(sym->declared_at), bind_c_sym->name,
7542 &(bind_c_sym->where));
7547 /* Clear the binding label to prevent checking multiple times. */
7548 sym->binding_label[0] = '\0';
7550 else if (bind_c_sym == NULL)
7552 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
7553 bind_c_sym->where = sym->declared_at;
7554 bind_c_sym->sym_name = sym->name;
7556 if (sym->attr.use_assoc == 1)
7557 bind_c_sym->mod_name = sym->module;
7559 if (sym->ns->proc_name != NULL)
7560 bind_c_sym->mod_name = sym->ns->proc_name->name;
7562 if (sym->attr.contained == 0)
7564 if (sym->attr.subroutine)
7565 bind_c_sym->type = GSYM_SUBROUTINE;
7566 else if (sym->attr.function)
7567 bind_c_sym->type = GSYM_FUNCTION;
7575 /* Resolve an index expression. */
7578 resolve_index_expr (gfc_expr *e)
7580 if (gfc_resolve_expr (e) == FAILURE)
7583 if (gfc_simplify_expr (e, 0) == FAILURE)
7586 if (gfc_specification_expr (e) == FAILURE)
7592 /* Resolve a charlen structure. */
7595 resolve_charlen (gfc_charlen *cl)
7604 specification_expr = 1;
7606 if (resolve_index_expr (cl->length) == FAILURE)
7608 specification_expr = 0;
7612 /* "If the character length parameter value evaluates to a negative
7613 value, the length of character entities declared is zero." */
7614 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
7616 gfc_warning_now ("CHARACTER variable has zero length at %L",
7617 &cl->length->where);
7618 gfc_replace_expr (cl->length, gfc_int_expr (0));
7621 /* Check that the character length is not too large. */
7622 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
7623 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
7624 && cl->length->ts.type == BT_INTEGER
7625 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
7627 gfc_error ("String length at %L is too large", &cl->length->where);
7635 /* Test for non-constant shape arrays. */
7638 is_non_constant_shape_array (gfc_symbol *sym)
7644 not_constant = false;
7645 if (sym->as != NULL)
7647 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
7648 has not been simplified; parameter array references. Do the
7649 simplification now. */
7650 for (i = 0; i < sym->as->rank; i++)
7652 e = sym->as->lower[i];
7653 if (e && (resolve_index_expr (e) == FAILURE
7654 || !gfc_is_constant_expr (e)))
7655 not_constant = true;
7657 e = sym->as->upper[i];
7658 if (e && (resolve_index_expr (e) == FAILURE
7659 || !gfc_is_constant_expr (e)))
7660 not_constant = true;
7663 return not_constant;
7666 /* Given a symbol and an initialization expression, add code to initialize
7667 the symbol to the function entry. */
7669 build_init_assign (gfc_symbol *sym, gfc_expr *init)
7673 gfc_namespace *ns = sym->ns;
7675 /* Search for the function namespace if this is a contained
7676 function without an explicit result. */
7677 if (sym->attr.function && sym == sym->result
7678 && sym->name != sym->ns->proc_name->name)
7681 for (;ns; ns = ns->sibling)
7682 if (strcmp (ns->proc_name->name, sym->name) == 0)
7688 gfc_free_expr (init);
7692 /* Build an l-value expression for the result. */
7693 lval = gfc_lval_expr_from_sym (sym);
7695 /* Add the code at scope entry. */
7696 init_st = gfc_get_code ();
7697 init_st->next = ns->code;
7700 /* Assign the default initializer to the l-value. */
7701 init_st->loc = sym->declared_at;
7702 init_st->op = EXEC_INIT_ASSIGN;
7703 init_st->expr1 = lval;
7704 init_st->expr2 = init;
7707 /* Assign the default initializer to a derived type variable or result. */
7710 apply_default_init (gfc_symbol *sym)
7712 gfc_expr *init = NULL;
7714 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7717 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
7718 init = gfc_default_initializer (&sym->ts);
7723 build_init_assign (sym, init);
7726 /* Build an initializer for a local integer, real, complex, logical, or
7727 character variable, based on the command line flags finit-local-zero,
7728 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
7729 null if the symbol should not have a default initialization. */
7731 build_default_init_expr (gfc_symbol *sym)
7734 gfc_expr *init_expr;
7737 /* These symbols should never have a default initialization. */
7738 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
7739 || sym->attr.external
7741 || sym->attr.pointer
7742 || sym->attr.in_equivalence
7743 || sym->attr.in_common
7746 || sym->attr.cray_pointee
7747 || sym->attr.cray_pointer)
7750 /* Now we'll try to build an initializer expression. */
7751 init_expr = gfc_get_expr ();
7752 init_expr->expr_type = EXPR_CONSTANT;
7753 init_expr->ts.type = sym->ts.type;
7754 init_expr->ts.kind = sym->ts.kind;
7755 init_expr->where = sym->declared_at;
7757 /* We will only initialize integers, reals, complex, logicals, and
7758 characters, and only if the corresponding command-line flags
7759 were set. Otherwise, we free init_expr and return null. */
7760 switch (sym->ts.type)
7763 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
7764 mpz_init_set_si (init_expr->value.integer,
7765 gfc_option.flag_init_integer_value);
7768 gfc_free_expr (init_expr);
7774 mpfr_init (init_expr->value.real);
7775 switch (gfc_option.flag_init_real)
7777 case GFC_INIT_REAL_SNAN:
7778 init_expr->is_snan = 1;
7780 case GFC_INIT_REAL_NAN:
7781 mpfr_set_nan (init_expr->value.real);
7784 case GFC_INIT_REAL_INF:
7785 mpfr_set_inf (init_expr->value.real, 1);
7788 case GFC_INIT_REAL_NEG_INF:
7789 mpfr_set_inf (init_expr->value.real, -1);
7792 case GFC_INIT_REAL_ZERO:
7793 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
7797 gfc_free_expr (init_expr);
7805 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
7807 mpfr_init (init_expr->value.complex.r);
7808 mpfr_init (init_expr->value.complex.i);
7810 switch (gfc_option.flag_init_real)
7812 case GFC_INIT_REAL_SNAN:
7813 init_expr->is_snan = 1;
7815 case GFC_INIT_REAL_NAN:
7816 mpfr_set_nan (mpc_realref (init_expr->value.complex));
7817 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
7820 case GFC_INIT_REAL_INF:
7821 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
7822 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
7825 case GFC_INIT_REAL_NEG_INF:
7826 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
7827 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
7830 case GFC_INIT_REAL_ZERO:
7832 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
7834 mpfr_set_ui (init_expr->value.complex.r, 0.0, GFC_RND_MODE);
7835 mpfr_set_ui (init_expr->value.complex.i, 0.0, GFC_RND_MODE);
7840 gfc_free_expr (init_expr);
7847 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
7848 init_expr->value.logical = 0;
7849 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
7850 init_expr->value.logical = 1;
7853 gfc_free_expr (init_expr);
7859 /* For characters, the length must be constant in order to
7860 create a default initializer. */
7861 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
7862 && sym->ts.u.cl->length
7863 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7865 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
7866 init_expr->value.character.length = char_len;
7867 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
7868 for (i = 0; i < char_len; i++)
7869 init_expr->value.character.string[i]
7870 = (unsigned char) gfc_option.flag_init_character_value;
7874 gfc_free_expr (init_expr);
7880 gfc_free_expr (init_expr);
7886 /* Add an initialization expression to a local variable. */
7888 apply_default_init_local (gfc_symbol *sym)
7890 gfc_expr *init = NULL;
7892 /* The symbol should be a variable or a function return value. */
7893 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7894 || (sym->attr.function && sym->result != sym))
7897 /* Try to build the initializer expression. If we can't initialize
7898 this symbol, then init will be NULL. */
7899 init = build_default_init_expr (sym);
7903 /* For saved variables, we don't want to add an initializer at
7904 function entry, so we just add a static initializer. */
7905 if (sym->attr.save || sym->ns->save_all)
7907 /* Don't clobber an existing initializer! */
7908 gcc_assert (sym->value == NULL);
7913 build_init_assign (sym, init);
7916 /* Resolution of common features of flavors variable and procedure. */
7919 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
7921 /* Constraints on deferred shape variable. */
7922 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
7924 if (sym->attr.allocatable)
7926 if (sym->attr.dimension)
7927 gfc_error ("Allocatable array '%s' at %L must have "
7928 "a deferred shape", sym->name, &sym->declared_at);
7930 gfc_error ("Scalar object '%s' at %L may not be ALLOCATABLE",
7931 sym->name, &sym->declared_at);
7935 if (sym->attr.pointer && sym->attr.dimension)
7937 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
7938 sym->name, &sym->declared_at);
7945 if (!mp_flag && !sym->attr.allocatable
7946 && !sym->attr.pointer && !sym->attr.dummy)
7948 gfc_error ("Array '%s' at %L cannot have a deferred shape",
7949 sym->name, &sym->declared_at);
7957 /* Check if a derived type is extensible. */
7960 type_is_extensible (gfc_symbol *sym)
7962 return !(sym->attr.is_bind_c || sym->attr.sequence);
7966 /* Additional checks for symbols with flavor variable and derived
7967 type. To be called from resolve_fl_variable. */
7970 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
7972 gcc_assert (sym->ts.type == BT_DERIVED);
7974 /* Check to see if a derived type is blocked from being host
7975 associated by the presence of another class I symbol in the same
7976 namespace. 14.6.1.3 of the standard and the discussion on
7977 comp.lang.fortran. */
7978 if (sym->ns != sym->ts.u.derived->ns
7979 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
7982 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
7983 if (s && s->attr.flavor != FL_DERIVED)
7985 gfc_error ("The type '%s' cannot be host associated at %L "
7986 "because it is blocked by an incompatible object "
7987 "of the same name declared at %L",
7988 sym->ts.u.derived->name, &sym->declared_at,
7994 /* 4th constraint in section 11.3: "If an object of a type for which
7995 component-initialization is specified (R429) appears in the
7996 specification-part of a module and does not have the ALLOCATABLE
7997 or POINTER attribute, the object shall have the SAVE attribute."
7999 The check for initializers is performed with
8000 has_default_initializer because gfc_default_initializer generates
8001 a hidden default for allocatable components. */
8002 if (!(sym->value || no_init_flag) && sym->ns->proc_name
8003 && sym->ns->proc_name->attr.flavor == FL_MODULE
8004 && !sym->ns->save_all && !sym->attr.save
8005 && !sym->attr.pointer && !sym->attr.allocatable
8006 && has_default_initializer (sym->ts.u.derived))
8008 gfc_error("Object '%s' at %L must have the SAVE attribute for "
8009 "default initialization of a component",
8010 sym->name, &sym->declared_at);
8014 if (sym->ts.is_class)
8017 if (!type_is_extensible (sym->ts.u.derived))
8019 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
8020 sym->ts.u.derived->name, sym->name, &sym->declared_at);
8025 if (!(sym->attr.dummy || sym->attr.allocatable || sym->attr.pointer))
8027 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
8028 "or pointer", sym->name, &sym->declared_at);
8033 /* Assign default initializer. */
8034 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
8035 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
8037 sym->value = gfc_default_initializer (&sym->ts);
8044 /* Resolve symbols with flavor variable. */
8047 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
8049 int no_init_flag, automatic_flag;
8051 const char *auto_save_msg;
8053 auto_save_msg = "Automatic object '%s' at %L cannot have the "
8056 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8059 /* Set this flag to check that variables are parameters of all entries.
8060 This check is effected by the call to gfc_resolve_expr through
8061 is_non_constant_shape_array. */
8062 specification_expr = 1;
8064 if (sym->ns->proc_name
8065 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8066 || sym->ns->proc_name->attr.is_main_program)
8067 && !sym->attr.use_assoc
8068 && !sym->attr.allocatable
8069 && !sym->attr.pointer
8070 && is_non_constant_shape_array (sym))
8072 /* The shape of a main program or module array needs to be
8074 gfc_error ("The module or main program array '%s' at %L must "
8075 "have constant shape", sym->name, &sym->declared_at);
8076 specification_expr = 0;
8080 if (sym->ts.type == BT_CHARACTER)
8082 /* Make sure that character string variables with assumed length are
8084 e = sym->ts.u.cl->length;
8085 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
8087 gfc_error ("Entity with assumed character length at %L must be a "
8088 "dummy argument or a PARAMETER", &sym->declared_at);
8092 if (e && sym->attr.save && !gfc_is_constant_expr (e))
8094 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8098 if (!gfc_is_constant_expr (e)
8099 && !(e->expr_type == EXPR_VARIABLE
8100 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
8101 && sym->ns->proc_name
8102 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8103 || sym->ns->proc_name->attr.is_main_program)
8104 && !sym->attr.use_assoc)
8106 gfc_error ("'%s' at %L must have constant character length "
8107 "in this context", sym->name, &sym->declared_at);
8112 if (sym->value == NULL && sym->attr.referenced)
8113 apply_default_init_local (sym); /* Try to apply a default initialization. */
8115 /* Determine if the symbol may not have an initializer. */
8116 no_init_flag = automatic_flag = 0;
8117 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
8118 || sym->attr.intrinsic || sym->attr.result)
8120 else if (sym->attr.dimension && !sym->attr.pointer
8121 && is_non_constant_shape_array (sym))
8123 no_init_flag = automatic_flag = 1;
8125 /* Also, they must not have the SAVE attribute.
8126 SAVE_IMPLICIT is checked below. */
8127 if (sym->attr.save == SAVE_EXPLICIT)
8129 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8134 /* Ensure that any initializer is simplified. */
8136 gfc_simplify_expr (sym->value, 1);
8138 /* Reject illegal initializers. */
8139 if (!sym->mark && sym->value)
8141 if (sym->attr.allocatable)
8142 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
8143 sym->name, &sym->declared_at);
8144 else if (sym->attr.external)
8145 gfc_error ("External '%s' at %L cannot have an initializer",
8146 sym->name, &sym->declared_at);
8147 else if (sym->attr.dummy
8148 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
8149 gfc_error ("Dummy '%s' at %L cannot have an initializer",
8150 sym->name, &sym->declared_at);
8151 else if (sym->attr.intrinsic)
8152 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
8153 sym->name, &sym->declared_at);
8154 else if (sym->attr.result)
8155 gfc_error ("Function result '%s' at %L cannot have an initializer",
8156 sym->name, &sym->declared_at);
8157 else if (automatic_flag)
8158 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
8159 sym->name, &sym->declared_at);
8166 if (sym->ts.type == BT_DERIVED)
8167 return resolve_fl_variable_derived (sym, no_init_flag);
8173 /* Resolve a procedure. */
8176 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
8178 gfc_formal_arglist *arg;
8180 if (sym->attr.ambiguous_interfaces && !sym->attr.referenced)
8181 gfc_warning ("Although not referenced, '%s' at %L has ambiguous "
8182 "interfaces", sym->name, &sym->declared_at);
8184 if (sym->attr.function
8185 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8188 if (sym->ts.type == BT_CHARACTER)
8190 gfc_charlen *cl = sym->ts.u.cl;
8192 if (cl && cl->length && gfc_is_constant_expr (cl->length)
8193 && resolve_charlen (cl) == FAILURE)
8196 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
8198 if (sym->attr.proc == PROC_ST_FUNCTION)
8200 gfc_error ("Character-valued statement function '%s' at %L must "
8201 "have constant length", sym->name, &sym->declared_at);
8205 if (sym->attr.external && sym->formal == NULL
8206 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
8208 gfc_error ("Automatic character length function '%s' at %L must "
8209 "have an explicit interface", sym->name,
8216 /* Ensure that derived type for are not of a private type. Internal
8217 module procedures are excluded by 2.2.3.3 - i.e., they are not
8218 externally accessible and can access all the objects accessible in
8220 if (!(sym->ns->parent
8221 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
8222 && gfc_check_access(sym->attr.access, sym->ns->default_access))
8224 gfc_interface *iface;
8226 for (arg = sym->formal; arg; arg = arg->next)
8229 && arg->sym->ts.type == BT_DERIVED
8230 && !arg->sym->ts.u.derived->attr.use_assoc
8231 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
8232 arg->sym->ts.u.derived->ns->default_access)
8233 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
8234 "PRIVATE type and cannot be a dummy argument"
8235 " of '%s', which is PUBLIC at %L",
8236 arg->sym->name, sym->name, &sym->declared_at)
8239 /* Stop this message from recurring. */
8240 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
8245 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8246 PRIVATE to the containing module. */
8247 for (iface = sym->generic; iface; iface = iface->next)
8249 for (arg = iface->sym->formal; arg; arg = arg->next)
8252 && arg->sym->ts.type == BT_DERIVED
8253 && !arg->sym->ts.u.derived->attr.use_assoc
8254 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
8255 arg->sym->ts.u.derived->ns->default_access)
8256 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8257 "'%s' in PUBLIC interface '%s' at %L "
8258 "takes dummy arguments of '%s' which is "
8259 "PRIVATE", iface->sym->name, sym->name,
8260 &iface->sym->declared_at,
8261 gfc_typename (&arg->sym->ts)) == FAILURE)
8263 /* Stop this message from recurring. */
8264 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
8270 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8271 PRIVATE to the containing module. */
8272 for (iface = sym->generic; iface; iface = iface->next)
8274 for (arg = iface->sym->formal; arg; arg = arg->next)
8277 && arg->sym->ts.type == BT_DERIVED
8278 && !arg->sym->ts.u.derived->attr.use_assoc
8279 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
8280 arg->sym->ts.u.derived->ns->default_access)
8281 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8282 "'%s' in PUBLIC interface '%s' at %L "
8283 "takes dummy arguments of '%s' which is "
8284 "PRIVATE", iface->sym->name, sym->name,
8285 &iface->sym->declared_at,
8286 gfc_typename (&arg->sym->ts)) == FAILURE)
8288 /* Stop this message from recurring. */
8289 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
8296 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
8297 && !sym->attr.proc_pointer)
8299 gfc_error ("Function '%s' at %L cannot have an initializer",
8300 sym->name, &sym->declared_at);
8304 /* An external symbol may not have an initializer because it is taken to be
8305 a procedure. Exception: Procedure Pointers. */
8306 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
8308 gfc_error ("External object '%s' at %L may not have an initializer",
8309 sym->name, &sym->declared_at);
8313 /* An elemental function is required to return a scalar 12.7.1 */
8314 if (sym->attr.elemental && sym->attr.function && sym->as)
8316 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
8317 "result", sym->name, &sym->declared_at);
8318 /* Reset so that the error only occurs once. */
8319 sym->attr.elemental = 0;
8323 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
8324 char-len-param shall not be array-valued, pointer-valued, recursive
8325 or pure. ....snip... A character value of * may only be used in the
8326 following ways: (i) Dummy arg of procedure - dummy associates with
8327 actual length; (ii) To declare a named constant; or (iii) External
8328 function - but length must be declared in calling scoping unit. */
8329 if (sym->attr.function
8330 && sym->ts.type == BT_CHARACTER
8331 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
8333 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
8334 || (sym->attr.recursive) || (sym->attr.pure))
8336 if (sym->as && sym->as->rank)
8337 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8338 "array-valued", sym->name, &sym->declared_at);
8340 if (sym->attr.pointer)
8341 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8342 "pointer-valued", sym->name, &sym->declared_at);
8345 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8346 "pure", sym->name, &sym->declared_at);
8348 if (sym->attr.recursive)
8349 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8350 "recursive", sym->name, &sym->declared_at);
8355 /* Appendix B.2 of the standard. Contained functions give an
8356 error anyway. Fixed-form is likely to be F77/legacy. */
8357 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
8358 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
8359 "CHARACTER(*) function '%s' at %L",
8360 sym->name, &sym->declared_at);
8363 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
8365 gfc_formal_arglist *curr_arg;
8366 int has_non_interop_arg = 0;
8368 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
8369 sym->common_block) == FAILURE)
8371 /* Clear these to prevent looking at them again if there was an
8373 sym->attr.is_bind_c = 0;
8374 sym->attr.is_c_interop = 0;
8375 sym->ts.is_c_interop = 0;
8379 /* So far, no errors have been found. */
8380 sym->attr.is_c_interop = 1;
8381 sym->ts.is_c_interop = 1;
8384 curr_arg = sym->formal;
8385 while (curr_arg != NULL)
8387 /* Skip implicitly typed dummy args here. */
8388 if (curr_arg->sym->attr.implicit_type == 0)
8389 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
8390 /* If something is found to fail, record the fact so we
8391 can mark the symbol for the procedure as not being
8392 BIND(C) to try and prevent multiple errors being
8394 has_non_interop_arg = 1;
8396 curr_arg = curr_arg->next;
8399 /* See if any of the arguments were not interoperable and if so, clear
8400 the procedure symbol to prevent duplicate error messages. */
8401 if (has_non_interop_arg != 0)
8403 sym->attr.is_c_interop = 0;
8404 sym->ts.is_c_interop = 0;
8405 sym->attr.is_bind_c = 0;
8409 if (!sym->attr.proc_pointer)
8411 if (sym->attr.save == SAVE_EXPLICIT)
8413 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
8414 "in '%s' at %L", sym->name, &sym->declared_at);
8417 if (sym->attr.intent)
8419 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
8420 "in '%s' at %L", sym->name, &sym->declared_at);
8423 if (sym->attr.subroutine && sym->attr.result)
8425 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
8426 "in '%s' at %L", sym->name, &sym->declared_at);
8429 if (sym->attr.external && sym->attr.function
8430 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
8431 || sym->attr.contained))
8433 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
8434 "in '%s' at %L", sym->name, &sym->declared_at);
8437 if (strcmp ("ppr@", sym->name) == 0)
8439 gfc_error ("Procedure pointer result '%s' at %L "
8440 "is missing the pointer attribute",
8441 sym->ns->proc_name->name, &sym->declared_at);
8450 /* Resolve a list of finalizer procedures. That is, after they have hopefully
8451 been defined and we now know their defined arguments, check that they fulfill
8452 the requirements of the standard for procedures used as finalizers. */
8455 gfc_resolve_finalizers (gfc_symbol* derived)
8457 gfc_finalizer* list;
8458 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
8459 gfc_try result = SUCCESS;
8460 bool seen_scalar = false;
8462 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
8465 /* Walk over the list of finalizer-procedures, check them, and if any one
8466 does not fit in with the standard's definition, print an error and remove
8467 it from the list. */
8468 prev_link = &derived->f2k_derived->finalizers;
8469 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
8475 /* Skip this finalizer if we already resolved it. */
8476 if (list->proc_tree)
8478 prev_link = &(list->next);
8482 /* Check this exists and is a SUBROUTINE. */
8483 if (!list->proc_sym->attr.subroutine)
8485 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
8486 list->proc_sym->name, &list->where);
8490 /* We should have exactly one argument. */
8491 if (!list->proc_sym->formal || list->proc_sym->formal->next)
8493 gfc_error ("FINAL procedure at %L must have exactly one argument",
8497 arg = list->proc_sym->formal->sym;
8499 /* This argument must be of our type. */
8500 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
8502 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
8503 &arg->declared_at, derived->name);
8507 /* It must neither be a pointer nor allocatable nor optional. */
8508 if (arg->attr.pointer)
8510 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
8514 if (arg->attr.allocatable)
8516 gfc_error ("Argument of FINAL procedure at %L must not be"
8517 " ALLOCATABLE", &arg->declared_at);
8520 if (arg->attr.optional)
8522 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
8527 /* It must not be INTENT(OUT). */
8528 if (arg->attr.intent == INTENT_OUT)
8530 gfc_error ("Argument of FINAL procedure at %L must not be"
8531 " INTENT(OUT)", &arg->declared_at);
8535 /* Warn if the procedure is non-scalar and not assumed shape. */
8536 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
8537 && arg->as->type != AS_ASSUMED_SHAPE)
8538 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
8539 " shape argument", &arg->declared_at);
8541 /* Check that it does not match in kind and rank with a FINAL procedure
8542 defined earlier. To really loop over the *earlier* declarations,
8543 we need to walk the tail of the list as new ones were pushed at the
8545 /* TODO: Handle kind parameters once they are implemented. */
8546 my_rank = (arg->as ? arg->as->rank : 0);
8547 for (i = list->next; i; i = i->next)
8549 /* Argument list might be empty; that is an error signalled earlier,
8550 but we nevertheless continued resolving. */
8551 if (i->proc_sym->formal)
8553 gfc_symbol* i_arg = i->proc_sym->formal->sym;
8554 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
8555 if (i_rank == my_rank)
8557 gfc_error ("FINAL procedure '%s' declared at %L has the same"
8558 " rank (%d) as '%s'",
8559 list->proc_sym->name, &list->where, my_rank,
8566 /* Is this the/a scalar finalizer procedure? */
8567 if (!arg->as || arg->as->rank == 0)
8570 /* Find the symtree for this procedure. */
8571 gcc_assert (!list->proc_tree);
8572 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
8574 prev_link = &list->next;
8577 /* Remove wrong nodes immediately from the list so we don't risk any
8578 troubles in the future when they might fail later expectations. */
8582 *prev_link = list->next;
8583 gfc_free_finalizer (i);
8586 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
8587 were nodes in the list, must have been for arrays. It is surely a good
8588 idea to have a scalar version there if there's something to finalize. */
8589 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
8590 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
8591 " defined at %L, suggest also scalar one",
8592 derived->name, &derived->declared_at);
8594 /* TODO: Remove this error when finalization is finished. */
8595 gfc_error ("Finalization at %L is not yet implemented",
8596 &derived->declared_at);
8602 /* Check that it is ok for the typebound procedure proc to override the
8606 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
8609 const gfc_symbol* proc_target;
8610 const gfc_symbol* old_target;
8611 unsigned proc_pass_arg, old_pass_arg, argpos;
8612 gfc_formal_arglist* proc_formal;
8613 gfc_formal_arglist* old_formal;
8615 /* This procedure should only be called for non-GENERIC proc. */
8616 gcc_assert (!proc->n.tb->is_generic);
8618 /* If the overwritten procedure is GENERIC, this is an error. */
8619 if (old->n.tb->is_generic)
8621 gfc_error ("Can't overwrite GENERIC '%s' at %L",
8622 old->name, &proc->n.tb->where);
8626 where = proc->n.tb->where;
8627 proc_target = proc->n.tb->u.specific->n.sym;
8628 old_target = old->n.tb->u.specific->n.sym;
8630 /* Check that overridden binding is not NON_OVERRIDABLE. */
8631 if (old->n.tb->non_overridable)
8633 gfc_error ("'%s' at %L overrides a procedure binding declared"
8634 " NON_OVERRIDABLE", proc->name, &where);
8638 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
8639 if (!old->n.tb->deferred && proc->n.tb->deferred)
8641 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
8642 " non-DEFERRED binding", proc->name, &where);
8646 /* If the overridden binding is PURE, the overriding must be, too. */
8647 if (old_target->attr.pure && !proc_target->attr.pure)
8649 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
8650 proc->name, &where);
8654 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
8655 is not, the overriding must not be either. */
8656 if (old_target->attr.elemental && !proc_target->attr.elemental)
8658 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
8659 " ELEMENTAL", proc->name, &where);
8662 if (!old_target->attr.elemental && proc_target->attr.elemental)
8664 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
8665 " be ELEMENTAL, either", proc->name, &where);
8669 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
8671 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
8673 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
8674 " SUBROUTINE", proc->name, &where);
8678 /* If the overridden binding is a FUNCTION, the overriding must also be a
8679 FUNCTION and have the same characteristics. */
8680 if (old_target->attr.function)
8682 if (!proc_target->attr.function)
8684 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
8685 " FUNCTION", proc->name, &where);
8689 /* FIXME: Do more comprehensive checking (including, for instance, the
8690 rank and array-shape). */
8691 gcc_assert (proc_target->result && old_target->result);
8692 if (!gfc_compare_types (&proc_target->result->ts,
8693 &old_target->result->ts))
8695 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
8696 " matching result types", proc->name, &where);
8701 /* If the overridden binding is PUBLIC, the overriding one must not be
8703 if (old->n.tb->access == ACCESS_PUBLIC
8704 && proc->n.tb->access == ACCESS_PRIVATE)
8706 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
8707 " PRIVATE", proc->name, &where);
8711 /* Compare the formal argument lists of both procedures. This is also abused
8712 to find the position of the passed-object dummy arguments of both
8713 bindings as at least the overridden one might not yet be resolved and we
8714 need those positions in the check below. */
8715 proc_pass_arg = old_pass_arg = 0;
8716 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
8718 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
8721 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
8722 proc_formal && old_formal;
8723 proc_formal = proc_formal->next, old_formal = old_formal->next)
8725 if (proc->n.tb->pass_arg
8726 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
8727 proc_pass_arg = argpos;
8728 if (old->n.tb->pass_arg
8729 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
8730 old_pass_arg = argpos;
8732 /* Check that the names correspond. */
8733 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
8735 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
8736 " to match the corresponding argument of the overridden"
8737 " procedure", proc_formal->sym->name, proc->name, &where,
8738 old_formal->sym->name);
8742 /* Check that the types correspond if neither is the passed-object
8744 /* FIXME: Do more comprehensive testing here. */
8745 if (proc_pass_arg != argpos && old_pass_arg != argpos
8746 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
8748 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L in"
8749 " in respect to the overridden procedure",
8750 proc_formal->sym->name, proc->name, &where);
8756 if (proc_formal || old_formal)
8758 gfc_error ("'%s' at %L must have the same number of formal arguments as"
8759 " the overridden procedure", proc->name, &where);
8763 /* If the overridden binding is NOPASS, the overriding one must also be
8765 if (old->n.tb->nopass && !proc->n.tb->nopass)
8767 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
8768 " NOPASS", proc->name, &where);
8772 /* If the overridden binding is PASS(x), the overriding one must also be
8773 PASS and the passed-object dummy arguments must correspond. */
8774 if (!old->n.tb->nopass)
8776 if (proc->n.tb->nopass)
8778 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
8779 " PASS", proc->name, &where);
8783 if (proc_pass_arg != old_pass_arg)
8785 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
8786 " the same position as the passed-object dummy argument of"
8787 " the overridden procedure", proc->name, &where);
8796 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
8799 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
8800 const char* generic_name, locus where)
8805 gcc_assert (t1->specific && t2->specific);
8806 gcc_assert (!t1->specific->is_generic);
8807 gcc_assert (!t2->specific->is_generic);
8809 sym1 = t1->specific->u.specific->n.sym;
8810 sym2 = t2->specific->u.specific->n.sym;
8812 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
8813 if (sym1->attr.subroutine != sym2->attr.subroutine
8814 || sym1->attr.function != sym2->attr.function)
8816 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
8817 " GENERIC '%s' at %L",
8818 sym1->name, sym2->name, generic_name, &where);
8822 /* Compare the interfaces. */
8823 if (gfc_compare_interfaces (sym1, sym2, 1, 0, NULL, 0))
8825 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
8826 sym1->name, sym2->name, generic_name, &where);
8834 /* Worker function for resolving a generic procedure binding; this is used to
8835 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
8837 The difference between those cases is finding possible inherited bindings
8838 that are overridden, as one has to look for them in tb_sym_root,
8839 tb_uop_root or tb_op, respectively. Thus the caller must already find
8840 the super-type and set p->overridden correctly. */
8843 resolve_tb_generic_targets (gfc_symbol* super_type,
8844 gfc_typebound_proc* p, const char* name)
8846 gfc_tbp_generic* target;
8847 gfc_symtree* first_target;
8848 gfc_symtree* inherited;
8850 gcc_assert (p && p->is_generic);
8852 /* Try to find the specific bindings for the symtrees in our target-list. */
8853 gcc_assert (p->u.generic);
8854 for (target = p->u.generic; target; target = target->next)
8855 if (!target->specific)
8857 gfc_typebound_proc* overridden_tbp;
8859 const char* target_name;
8861 target_name = target->specific_st->name;
8863 /* Defined for this type directly. */
8864 if (target->specific_st->n.tb)
8866 target->specific = target->specific_st->n.tb;
8867 goto specific_found;
8870 /* Look for an inherited specific binding. */
8873 inherited = gfc_find_typebound_proc (super_type, NULL,
8878 gcc_assert (inherited->n.tb);
8879 target->specific = inherited->n.tb;
8880 goto specific_found;
8884 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
8885 " at %L", target_name, name, &p->where);
8888 /* Once we've found the specific binding, check it is not ambiguous with
8889 other specifics already found or inherited for the same GENERIC. */
8891 gcc_assert (target->specific);
8893 /* This must really be a specific binding! */
8894 if (target->specific->is_generic)
8896 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
8897 " '%s' is GENERIC, too", name, &p->where, target_name);
8901 /* Check those already resolved on this type directly. */
8902 for (g = p->u.generic; g; g = g->next)
8903 if (g != target && g->specific
8904 && check_generic_tbp_ambiguity (target, g, name, p->where)
8908 /* Check for ambiguity with inherited specific targets. */
8909 for (overridden_tbp = p->overridden; overridden_tbp;
8910 overridden_tbp = overridden_tbp->overridden)
8911 if (overridden_tbp->is_generic)
8913 for (g = overridden_tbp->u.generic; g; g = g->next)
8915 gcc_assert (g->specific);
8916 if (check_generic_tbp_ambiguity (target, g,
8917 name, p->where) == FAILURE)
8923 /* If we attempt to "overwrite" a specific binding, this is an error. */
8924 if (p->overridden && !p->overridden->is_generic)
8926 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
8927 " the same name", name, &p->where);
8931 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
8932 all must have the same attributes here. */
8933 first_target = p->u.generic->specific->u.specific;
8934 gcc_assert (first_target);
8935 p->subroutine = first_target->n.sym->attr.subroutine;
8936 p->function = first_target->n.sym->attr.function;
8942 /* Resolve a GENERIC procedure binding for a derived type. */
8945 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
8947 gfc_symbol* super_type;
8949 /* Find the overridden binding if any. */
8950 st->n.tb->overridden = NULL;
8951 super_type = gfc_get_derived_super_type (derived);
8954 gfc_symtree* overridden;
8955 overridden = gfc_find_typebound_proc (super_type, NULL, st->name, true);
8957 if (overridden && overridden->n.tb)
8958 st->n.tb->overridden = overridden->n.tb;
8961 /* Resolve using worker function. */
8962 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
8966 /* Retrieve the target-procedure of an operator binding and do some checks in
8967 common for intrinsic and user-defined type-bound operators. */
8970 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
8972 gfc_symbol* target_proc;
8974 gcc_assert (target->specific && !target->specific->is_generic);
8975 target_proc = target->specific->u.specific->n.sym;
8976 gcc_assert (target_proc);
8978 /* All operator bindings must have a passed-object dummy argument. */
8979 if (target->specific->nopass)
8981 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
8989 /* Resolve a type-bound intrinsic operator. */
8992 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
8993 gfc_typebound_proc* p)
8995 gfc_symbol* super_type;
8996 gfc_tbp_generic* target;
8998 /* If there's already an error here, do nothing (but don't fail again). */
9002 /* Operators should always be GENERIC bindings. */
9003 gcc_assert (p->is_generic);
9005 /* Look for an overridden binding. */
9006 super_type = gfc_get_derived_super_type (derived);
9007 if (super_type && super_type->f2k_derived)
9008 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
9011 p->overridden = NULL;
9013 /* Resolve general GENERIC properties using worker function. */
9014 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
9017 /* Check the targets to be procedures of correct interface. */
9018 for (target = p->u.generic; target; target = target->next)
9020 gfc_symbol* target_proc;
9022 target_proc = get_checked_tb_operator_target (target, p->where);
9026 if (!gfc_check_operator_interface (target_proc, op, p->where))
9038 /* Resolve a type-bound user operator (tree-walker callback). */
9040 static gfc_symbol* resolve_bindings_derived;
9041 static gfc_try resolve_bindings_result;
9043 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
9046 resolve_typebound_user_op (gfc_symtree* stree)
9048 gfc_symbol* super_type;
9049 gfc_tbp_generic* target;
9051 gcc_assert (stree && stree->n.tb);
9053 if (stree->n.tb->error)
9056 /* Operators should always be GENERIC bindings. */
9057 gcc_assert (stree->n.tb->is_generic);
9059 /* Find overridden procedure, if any. */
9060 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9061 if (super_type && super_type->f2k_derived)
9063 gfc_symtree* overridden;
9064 overridden = gfc_find_typebound_user_op (super_type, NULL,
9067 if (overridden && overridden->n.tb)
9068 stree->n.tb->overridden = overridden->n.tb;
9071 stree->n.tb->overridden = NULL;
9073 /* Resolve basically using worker function. */
9074 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
9078 /* Check the targets to be functions of correct interface. */
9079 for (target = stree->n.tb->u.generic; target; target = target->next)
9081 gfc_symbol* target_proc;
9083 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
9087 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
9094 resolve_bindings_result = FAILURE;
9095 stree->n.tb->error = 1;
9099 /* Resolve the type-bound procedures for a derived type. */
9102 resolve_typebound_procedure (gfc_symtree* stree)
9107 gfc_symbol* super_type;
9108 gfc_component* comp;
9112 /* Undefined specific symbol from GENERIC target definition. */
9116 if (stree->n.tb->error)
9119 /* If this is a GENERIC binding, use that routine. */
9120 if (stree->n.tb->is_generic)
9122 if (resolve_typebound_generic (resolve_bindings_derived, stree)
9128 /* Get the target-procedure to check it. */
9129 gcc_assert (!stree->n.tb->is_generic);
9130 gcc_assert (stree->n.tb->u.specific);
9131 proc = stree->n.tb->u.specific->n.sym;
9132 where = stree->n.tb->where;
9134 /* Default access should already be resolved from the parser. */
9135 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
9137 /* It should be a module procedure or an external procedure with explicit
9138 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
9139 if ((!proc->attr.subroutine && !proc->attr.function)
9140 || (proc->attr.proc != PROC_MODULE
9141 && proc->attr.if_source != IFSRC_IFBODY)
9142 || (proc->attr.abstract && !stree->n.tb->deferred))
9144 gfc_error ("'%s' must be a module procedure or an external procedure with"
9145 " an explicit interface at %L", proc->name, &where);
9148 stree->n.tb->subroutine = proc->attr.subroutine;
9149 stree->n.tb->function = proc->attr.function;
9151 /* Find the super-type of the current derived type. We could do this once and
9152 store in a global if speed is needed, but as long as not I believe this is
9153 more readable and clearer. */
9154 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9156 /* If PASS, resolve and check arguments if not already resolved / loaded
9157 from a .mod file. */
9158 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
9160 if (stree->n.tb->pass_arg)
9162 gfc_formal_arglist* i;
9164 /* If an explicit passing argument name is given, walk the arg-list
9168 stree->n.tb->pass_arg_num = 1;
9169 for (i = proc->formal; i; i = i->next)
9171 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
9176 ++stree->n.tb->pass_arg_num;
9181 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
9183 proc->name, stree->n.tb->pass_arg, &where,
9184 stree->n.tb->pass_arg);
9190 /* Otherwise, take the first one; there should in fact be at least
9192 stree->n.tb->pass_arg_num = 1;
9195 gfc_error ("Procedure '%s' with PASS at %L must have at"
9196 " least one argument", proc->name, &where);
9199 me_arg = proc->formal->sym;
9202 /* Now check that the argument-type matches. */
9203 gcc_assert (me_arg);
9204 if (me_arg->ts.type != BT_DERIVED
9205 || me_arg->ts.u.derived != resolve_bindings_derived)
9207 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
9208 " the derived-type '%s'", me_arg->name, proc->name,
9209 me_arg->name, &where, resolve_bindings_derived->name);
9213 if (!me_arg->ts.is_class)
9215 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
9216 " at %L", proc->name, &where);
9221 /* If we are extending some type, check that we don't override a procedure
9222 flagged NON_OVERRIDABLE. */
9223 stree->n.tb->overridden = NULL;
9226 gfc_symtree* overridden;
9227 overridden = gfc_find_typebound_proc (super_type, NULL,
9230 if (overridden && overridden->n.tb)
9231 stree->n.tb->overridden = overridden->n.tb;
9233 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
9237 /* See if there's a name collision with a component directly in this type. */
9238 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
9239 if (!strcmp (comp->name, stree->name))
9241 gfc_error ("Procedure '%s' at %L has the same name as a component of"
9243 stree->name, &where, resolve_bindings_derived->name);
9247 /* Try to find a name collision with an inherited component. */
9248 if (super_type && gfc_find_component (super_type, stree->name, true, true))
9250 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
9251 " component of '%s'",
9252 stree->name, &where, resolve_bindings_derived->name);
9256 stree->n.tb->error = 0;
9260 resolve_bindings_result = FAILURE;
9261 stree->n.tb->error = 1;
9265 resolve_typebound_procedures (gfc_symbol* derived)
9270 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
9273 resolve_bindings_derived = derived;
9274 resolve_bindings_result = SUCCESS;
9276 if (derived->f2k_derived->tb_sym_root)
9277 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
9278 &resolve_typebound_procedure);
9280 found_op = (derived->f2k_derived->tb_uop_root != NULL);
9281 if (derived->f2k_derived->tb_uop_root)
9282 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
9283 &resolve_typebound_user_op);
9285 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
9287 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
9288 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
9290 resolve_bindings_result = FAILURE;
9295 /* FIXME: Remove this (and found_op) once calls are fully implemented. */
9298 gfc_error ("Derived type '%s' at %L contains type-bound OPERATOR's,"
9299 " they are not yet implemented.",
9300 derived->name, &derived->declared_at);
9301 resolve_bindings_result = FAILURE;
9304 return resolve_bindings_result;
9308 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
9309 to give all identical derived types the same backend_decl. */
9311 add_dt_to_dt_list (gfc_symbol *derived)
9313 gfc_dt_list *dt_list;
9315 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
9316 if (derived == dt_list->derived)
9319 if (dt_list == NULL)
9321 dt_list = gfc_get_dt_list ();
9322 dt_list->next = gfc_derived_types;
9323 dt_list->derived = derived;
9324 gfc_derived_types = dt_list;
9329 /* Ensure that a derived-type is really not abstract, meaning that every
9330 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
9333 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
9338 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
9340 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
9343 if (st->n.tb && st->n.tb->deferred)
9345 gfc_symtree* overriding;
9346 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true);
9347 gcc_assert (overriding && overriding->n.tb);
9348 if (overriding->n.tb->deferred)
9350 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
9351 " '%s' is DEFERRED and not overridden",
9352 sub->name, &sub->declared_at, st->name);
9361 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
9363 /* The algorithm used here is to recursively travel up the ancestry of sub
9364 and for each ancestor-type, check all bindings. If any of them is
9365 DEFERRED, look it up starting from sub and see if the found (overriding)
9366 binding is not DEFERRED.
9367 This is not the most efficient way to do this, but it should be ok and is
9368 clearer than something sophisticated. */
9370 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
9372 /* Walk bindings of this ancestor. */
9373 if (ancestor->f2k_derived)
9376 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
9381 /* Find next ancestor type and recurse on it. */
9382 ancestor = gfc_get_derived_super_type (ancestor);
9384 return ensure_not_abstract (sub, ancestor);
9390 static void resolve_symbol (gfc_symbol *sym);
9393 /* Resolve the components of a derived type. */
9396 resolve_fl_derived (gfc_symbol *sym)
9398 gfc_symbol* super_type;
9402 super_type = gfc_get_derived_super_type (sym);
9404 /* Ensure the extended type gets resolved before we do. */
9405 if (super_type && resolve_fl_derived (super_type) == FAILURE)
9408 /* An ABSTRACT type must be extensible. */
9409 if (sym->attr.abstract && !type_is_extensible (sym))
9411 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
9412 sym->name, &sym->declared_at);
9416 for (c = sym->components; c != NULL; c = c->next)
9418 if (c->attr.proc_pointer && c->ts.interface)
9420 if (c->ts.interface->attr.procedure)
9421 gfc_error ("Interface '%s', used by procedure pointer component "
9422 "'%s' at %L, is declared in a later PROCEDURE statement",
9423 c->ts.interface->name, c->name, &c->loc);
9425 /* Get the attributes from the interface (now resolved). */
9426 if (c->ts.interface->attr.if_source
9427 || c->ts.interface->attr.intrinsic)
9429 gfc_symbol *ifc = c->ts.interface;
9431 if (ifc->formal && !ifc->formal_ns)
9432 resolve_symbol (ifc);
9434 if (ifc->attr.intrinsic)
9435 resolve_intrinsic (ifc, &ifc->declared_at);
9439 c->ts = ifc->result->ts;
9440 c->attr.allocatable = ifc->result->attr.allocatable;
9441 c->attr.pointer = ifc->result->attr.pointer;
9442 c->attr.dimension = ifc->result->attr.dimension;
9443 c->as = gfc_copy_array_spec (ifc->result->as);
9448 c->attr.allocatable = ifc->attr.allocatable;
9449 c->attr.pointer = ifc->attr.pointer;
9450 c->attr.dimension = ifc->attr.dimension;
9451 c->as = gfc_copy_array_spec (ifc->as);
9453 c->ts.interface = ifc;
9454 c->attr.function = ifc->attr.function;
9455 c->attr.subroutine = ifc->attr.subroutine;
9456 gfc_copy_formal_args_ppc (c, ifc);
9458 c->attr.pure = ifc->attr.pure;
9459 c->attr.elemental = ifc->attr.elemental;
9460 c->attr.recursive = ifc->attr.recursive;
9461 c->attr.always_explicit = ifc->attr.always_explicit;
9462 c->attr.ext_attr |= ifc->attr.ext_attr;
9463 /* Replace symbols in array spec. */
9467 for (i = 0; i < c->as->rank; i++)
9469 gfc_expr_replace_comp (c->as->lower[i], c);
9470 gfc_expr_replace_comp (c->as->upper[i], c);
9473 /* Copy char length. */
9474 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
9476 c->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
9477 gfc_expr_replace_comp (c->ts.u.cl->length, c);
9480 else if (c->ts.interface->name[0] != '\0')
9482 gfc_error ("Interface '%s' of procedure pointer component "
9483 "'%s' at %L must be explicit", c->ts.interface->name,
9488 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
9490 c->ts = *gfc_get_default_type (c->name, NULL);
9491 c->attr.implicit_type = 1;
9494 /* Procedure pointer components: Check PASS arg. */
9495 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0)
9499 if (c->tb->pass_arg)
9501 gfc_formal_arglist* i;
9503 /* If an explicit passing argument name is given, walk the arg-list
9507 c->tb->pass_arg_num = 1;
9508 for (i = c->formal; i; i = i->next)
9510 if (!strcmp (i->sym->name, c->tb->pass_arg))
9515 c->tb->pass_arg_num++;
9520 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
9521 "at %L has no argument '%s'", c->name,
9522 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
9529 /* Otherwise, take the first one; there should in fact be at least
9531 c->tb->pass_arg_num = 1;
9534 gfc_error ("Procedure pointer component '%s' with PASS at %L "
9535 "must have at least one argument",
9540 me_arg = c->formal->sym;
9543 /* Now check that the argument-type matches. */
9544 gcc_assert (me_arg);
9545 if (me_arg->ts.type != BT_DERIVED
9546 || me_arg->ts.u.derived != sym)
9548 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
9549 " the derived type '%s'", me_arg->name, c->name,
9550 me_arg->name, &c->loc, sym->name);
9555 /* Check for C453. */
9556 if (me_arg->attr.dimension)
9558 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
9559 "must be scalar", me_arg->name, c->name, me_arg->name,
9565 if (me_arg->attr.pointer)
9567 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
9568 "may not have the POINTER attribute", me_arg->name,
9569 c->name, me_arg->name, &c->loc);
9574 if (me_arg->attr.allocatable)
9576 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
9577 "may not be ALLOCATABLE", me_arg->name, c->name,
9578 me_arg->name, &c->loc);
9583 if (type_is_extensible (sym) && !me_arg->ts.is_class)
9584 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
9585 " at %L", c->name, &c->loc);
9589 /* Check type-spec if this is not the parent-type component. */
9590 if ((!sym->attr.extension || c != sym->components)
9591 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
9594 /* If this type is an extension, see if this component has the same name
9595 as an inherited type-bound procedure. */
9597 && gfc_find_typebound_proc (super_type, NULL, c->name, true))
9599 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
9600 " inherited type-bound procedure",
9601 c->name, sym->name, &c->loc);
9605 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
9607 if (c->ts.u.cl->length == NULL
9608 || (resolve_charlen (c->ts.u.cl) == FAILURE)
9609 || !gfc_is_constant_expr (c->ts.u.cl->length))
9611 gfc_error ("Character length of component '%s' needs to "
9612 "be a constant specification expression at %L",
9614 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
9619 if (c->ts.type == BT_DERIVED
9620 && sym->component_access != ACCESS_PRIVATE
9621 && gfc_check_access (sym->attr.access, sym->ns->default_access)
9622 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
9623 && !c->ts.u.derived->attr.use_assoc
9624 && !gfc_check_access (c->ts.u.derived->attr.access,
9625 c->ts.u.derived->ns->default_access)
9626 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
9627 "is a PRIVATE type and cannot be a component of "
9628 "'%s', which is PUBLIC at %L", c->name,
9629 sym->name, &sym->declared_at) == FAILURE)
9632 if (sym->attr.sequence)
9634 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
9636 gfc_error ("Component %s of SEQUENCE type declared at %L does "
9637 "not have the SEQUENCE attribute",
9638 c->ts.u.derived->name, &sym->declared_at);
9643 if (c->ts.type == BT_DERIVED && c->attr.pointer
9644 && c->ts.u.derived->components == NULL
9645 && !c->ts.u.derived->attr.zero_comp)
9647 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
9648 "that has not been declared", c->name, sym->name,
9654 if (c->ts.type == BT_DERIVED && c->ts.is_class
9655 && !(c->attr.pointer || c->attr.allocatable))
9657 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
9658 "or pointer", c->name, &c->loc);
9662 /* Ensure that all the derived type components are put on the
9663 derived type list; even in formal namespaces, where derived type
9664 pointer components might not have been declared. */
9665 if (c->ts.type == BT_DERIVED
9667 && c->ts.u.derived->components
9669 && sym != c->ts.u.derived)
9670 add_dt_to_dt_list (c->ts.u.derived);
9672 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
9676 for (i = 0; i < c->as->rank; i++)
9678 if (c->as->lower[i] == NULL
9679 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
9680 || !gfc_is_constant_expr (c->as->lower[i])
9681 || c->as->upper[i] == NULL
9682 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
9683 || !gfc_is_constant_expr (c->as->upper[i]))
9685 gfc_error ("Component '%s' of '%s' at %L must have "
9686 "constant array bounds",
9687 c->name, sym->name, &c->loc);
9693 /* Resolve the type-bound procedures. */
9694 if (resolve_typebound_procedures (sym) == FAILURE)
9697 /* Resolve the finalizer procedures. */
9698 if (gfc_resolve_finalizers (sym) == FAILURE)
9701 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
9702 all DEFERRED bindings are overridden. */
9703 if (super_type && super_type->attr.abstract && !sym->attr.abstract
9704 && ensure_not_abstract (sym, super_type) == FAILURE)
9707 /* Add derived type to the derived type list. */
9708 add_dt_to_dt_list (sym);
9715 resolve_fl_namelist (gfc_symbol *sym)
9720 /* Reject PRIVATE objects in a PUBLIC namelist. */
9721 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
9723 for (nl = sym->namelist; nl; nl = nl->next)
9725 if (!nl->sym->attr.use_assoc
9726 && !is_sym_host_assoc (nl->sym, sym->ns)
9727 && !gfc_check_access(nl->sym->attr.access,
9728 nl->sym->ns->default_access))
9730 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
9731 "cannot be member of PUBLIC namelist '%s' at %L",
9732 nl->sym->name, sym->name, &sym->declared_at);
9736 /* Types with private components that came here by USE-association. */
9737 if (nl->sym->ts.type == BT_DERIVED
9738 && derived_inaccessible (nl->sym->ts.u.derived))
9740 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
9741 "components and cannot be member of namelist '%s' at %L",
9742 nl->sym->name, sym->name, &sym->declared_at);
9746 /* Types with private components that are defined in the same module. */
9747 if (nl->sym->ts.type == BT_DERIVED
9748 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
9749 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
9750 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
9751 nl->sym->ns->default_access))
9753 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
9754 "cannot be a member of PUBLIC namelist '%s' at %L",
9755 nl->sym->name, sym->name, &sym->declared_at);
9761 for (nl = sym->namelist; nl; nl = nl->next)
9763 /* Reject namelist arrays of assumed shape. */
9764 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
9765 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
9766 "must not have assumed shape in namelist "
9767 "'%s' at %L", nl->sym->name, sym->name,
9768 &sym->declared_at) == FAILURE)
9771 /* Reject namelist arrays that are not constant shape. */
9772 if (is_non_constant_shape_array (nl->sym))
9774 gfc_error ("NAMELIST array object '%s' must have constant "
9775 "shape in namelist '%s' at %L", nl->sym->name,
9776 sym->name, &sym->declared_at);
9780 /* Namelist objects cannot have allocatable or pointer components. */
9781 if (nl->sym->ts.type != BT_DERIVED)
9784 if (nl->sym->ts.u.derived->attr.alloc_comp)
9786 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9787 "have ALLOCATABLE components",
9788 nl->sym->name, sym->name, &sym->declared_at);
9792 if (nl->sym->ts.u.derived->attr.pointer_comp)
9794 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9795 "have POINTER components",
9796 nl->sym->name, sym->name, &sym->declared_at);
9802 /* 14.1.2 A module or internal procedure represent local entities
9803 of the same type as a namelist member and so are not allowed. */
9804 for (nl = sym->namelist; nl; nl = nl->next)
9806 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
9809 if (nl->sym->attr.function && nl->sym == nl->sym->result)
9810 if ((nl->sym == sym->ns->proc_name)
9812 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
9816 if (nl->sym && nl->sym->name)
9817 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
9818 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
9820 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
9821 "attribute in '%s' at %L", nlsym->name,
9832 resolve_fl_parameter (gfc_symbol *sym)
9834 /* A parameter array's shape needs to be constant. */
9836 && (sym->as->type == AS_DEFERRED
9837 || is_non_constant_shape_array (sym)))
9839 gfc_error ("Parameter array '%s' at %L cannot be automatic "
9840 "or of deferred shape", sym->name, &sym->declared_at);
9844 /* Make sure a parameter that has been implicitly typed still
9845 matches the implicit type, since PARAMETER statements can precede
9846 IMPLICIT statements. */
9847 if (sym->attr.implicit_type
9848 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
9851 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
9852 "later IMPLICIT type", sym->name, &sym->declared_at);
9856 /* Make sure the types of derived parameters are consistent. This
9857 type checking is deferred until resolution because the type may
9858 refer to a derived type from the host. */
9859 if (sym->ts.type == BT_DERIVED
9860 && !gfc_compare_types (&sym->ts, &sym->value->ts))
9862 gfc_error ("Incompatible derived type in PARAMETER at %L",
9863 &sym->value->where);
9870 /* Do anything necessary to resolve a symbol. Right now, we just
9871 assume that an otherwise unknown symbol is a variable. This sort
9872 of thing commonly happens for symbols in module. */
9875 resolve_symbol (gfc_symbol *sym)
9877 int check_constant, mp_flag;
9878 gfc_symtree *symtree;
9879 gfc_symtree *this_symtree;
9883 if (sym->attr.flavor == FL_UNKNOWN)
9886 /* If we find that a flavorless symbol is an interface in one of the
9887 parent namespaces, find its symtree in this namespace, free the
9888 symbol and set the symtree to point to the interface symbol. */
9889 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
9891 symtree = gfc_find_symtree (ns->sym_root, sym->name);
9892 if (symtree && symtree->n.sym->generic)
9894 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
9898 gfc_free_symbol (sym);
9899 symtree->n.sym->refs++;
9900 this_symtree->n.sym = symtree->n.sym;
9905 /* Otherwise give it a flavor according to such attributes as
9907 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
9908 sym->attr.flavor = FL_VARIABLE;
9911 sym->attr.flavor = FL_PROCEDURE;
9912 if (sym->attr.dimension)
9913 sym->attr.function = 1;
9917 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
9918 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
9920 if (sym->attr.procedure && sym->ts.interface
9921 && sym->attr.if_source != IFSRC_DECL)
9923 if (sym->ts.interface == sym)
9925 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
9926 "interface", sym->name, &sym->declared_at);
9929 if (sym->ts.interface->attr.procedure)
9931 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
9932 " in a later PROCEDURE statement", sym->ts.interface->name,
9933 sym->name,&sym->declared_at);
9937 /* Get the attributes from the interface (now resolved). */
9938 if (sym->ts.interface->attr.if_source
9939 || sym->ts.interface->attr.intrinsic)
9941 gfc_symbol *ifc = sym->ts.interface;
9942 resolve_symbol (ifc);
9944 if (ifc->attr.intrinsic)
9945 resolve_intrinsic (ifc, &ifc->declared_at);
9948 sym->ts = ifc->result->ts;
9951 sym->ts.interface = ifc;
9952 sym->attr.function = ifc->attr.function;
9953 sym->attr.subroutine = ifc->attr.subroutine;
9954 gfc_copy_formal_args (sym, ifc);
9956 sym->attr.allocatable = ifc->attr.allocatable;
9957 sym->attr.pointer = ifc->attr.pointer;
9958 sym->attr.pure = ifc->attr.pure;
9959 sym->attr.elemental = ifc->attr.elemental;
9960 sym->attr.dimension = ifc->attr.dimension;
9961 sym->attr.recursive = ifc->attr.recursive;
9962 sym->attr.always_explicit = ifc->attr.always_explicit;
9963 sym->attr.ext_attr |= ifc->attr.ext_attr;
9964 /* Copy array spec. */
9965 sym->as = gfc_copy_array_spec (ifc->as);
9969 for (i = 0; i < sym->as->rank; i++)
9971 gfc_expr_replace_symbols (sym->as->lower[i], sym);
9972 gfc_expr_replace_symbols (sym->as->upper[i], sym);
9975 /* Copy char length. */
9976 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
9978 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
9979 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
9982 else if (sym->ts.interface->name[0] != '\0')
9984 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
9985 sym->ts.interface->name, sym->name, &sym->declared_at);
9990 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
9993 /* Symbols that are module procedures with results (functions) have
9994 the types and array specification copied for type checking in
9995 procedures that call them, as well as for saving to a module
9996 file. These symbols can't stand the scrutiny that their results
9998 mp_flag = (sym->result != NULL && sym->result != sym);
10001 /* Make sure that the intrinsic is consistent with its internal
10002 representation. This needs to be done before assigning a default
10003 type to avoid spurious warnings. */
10004 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
10005 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
10008 /* Assign default type to symbols that need one and don't have one. */
10009 if (sym->ts.type == BT_UNKNOWN)
10011 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
10012 gfc_set_default_type (sym, 1, NULL);
10014 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
10015 && !sym->attr.function && !sym->attr.subroutine
10016 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
10017 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
10019 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
10021 /* The specific case of an external procedure should emit an error
10022 in the case that there is no implicit type. */
10024 gfc_set_default_type (sym, sym->attr.external, NULL);
10027 /* Result may be in another namespace. */
10028 resolve_symbol (sym->result);
10030 if (!sym->result->attr.proc_pointer)
10032 sym->ts = sym->result->ts;
10033 sym->as = gfc_copy_array_spec (sym->result->as);
10034 sym->attr.dimension = sym->result->attr.dimension;
10035 sym->attr.pointer = sym->result->attr.pointer;
10036 sym->attr.allocatable = sym->result->attr.allocatable;
10042 /* Assumed size arrays and assumed shape arrays must be dummy
10045 if (sym->as != NULL
10046 && (sym->as->type == AS_ASSUMED_SIZE
10047 || sym->as->type == AS_ASSUMED_SHAPE)
10048 && sym->attr.dummy == 0)
10050 if (sym->as->type == AS_ASSUMED_SIZE)
10051 gfc_error ("Assumed size array at %L must be a dummy argument",
10052 &sym->declared_at);
10054 gfc_error ("Assumed shape array at %L must be a dummy argument",
10055 &sym->declared_at);
10059 /* Make sure symbols with known intent or optional are really dummy
10060 variable. Because of ENTRY statement, this has to be deferred
10061 until resolution time. */
10063 if (!sym->attr.dummy
10064 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
10066 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
10070 if (sym->attr.value && !sym->attr.dummy)
10072 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
10073 "it is not a dummy argument", sym->name, &sym->declared_at);
10077 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
10079 gfc_charlen *cl = sym->ts.u.cl;
10080 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10082 gfc_error ("Character dummy variable '%s' at %L with VALUE "
10083 "attribute must have constant length",
10084 sym->name, &sym->declared_at);
10088 if (sym->ts.is_c_interop
10089 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
10091 gfc_error ("C interoperable character dummy variable '%s' at %L "
10092 "with VALUE attribute must have length one",
10093 sym->name, &sym->declared_at);
10098 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
10099 do this for something that was implicitly typed because that is handled
10100 in gfc_set_default_type. Handle dummy arguments and procedure
10101 definitions separately. Also, anything that is use associated is not
10102 handled here but instead is handled in the module it is declared in.
10103 Finally, derived type definitions are allowed to be BIND(C) since that
10104 only implies that they're interoperable, and they are checked fully for
10105 interoperability when a variable is declared of that type. */
10106 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
10107 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
10108 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
10110 gfc_try t = SUCCESS;
10112 /* First, make sure the variable is declared at the
10113 module-level scope (J3/04-007, Section 15.3). */
10114 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
10115 sym->attr.in_common == 0)
10117 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
10118 "is neither a COMMON block nor declared at the "
10119 "module level scope", sym->name, &(sym->declared_at));
10122 else if (sym->common_head != NULL)
10124 t = verify_com_block_vars_c_interop (sym->common_head);
10128 /* If type() declaration, we need to verify that the components
10129 of the given type are all C interoperable, etc. */
10130 if (sym->ts.type == BT_DERIVED &&
10131 sym->ts.u.derived->attr.is_c_interop != 1)
10133 /* Make sure the user marked the derived type as BIND(C). If
10134 not, call the verify routine. This could print an error
10135 for the derived type more than once if multiple variables
10136 of that type are declared. */
10137 if (sym->ts.u.derived->attr.is_bind_c != 1)
10138 verify_bind_c_derived_type (sym->ts.u.derived);
10142 /* Verify the variable itself as C interoperable if it
10143 is BIND(C). It is not possible for this to succeed if
10144 the verify_bind_c_derived_type failed, so don't have to handle
10145 any error returned by verify_bind_c_derived_type. */
10146 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
10147 sym->common_block);
10152 /* clear the is_bind_c flag to prevent reporting errors more than
10153 once if something failed. */
10154 sym->attr.is_bind_c = 0;
10159 /* If a derived type symbol has reached this point, without its
10160 type being declared, we have an error. Notice that most
10161 conditions that produce undefined derived types have already
10162 been dealt with. However, the likes of:
10163 implicit type(t) (t) ..... call foo (t) will get us here if
10164 the type is not declared in the scope of the implicit
10165 statement. Change the type to BT_UNKNOWN, both because it is so
10166 and to prevent an ICE. */
10167 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
10168 && !sym->ts.u.derived->attr.zero_comp)
10170 gfc_error ("The derived type '%s' at %L is of type '%s', "
10171 "which has not been defined", sym->name,
10172 &sym->declared_at, sym->ts.u.derived->name);
10173 sym->ts.type = BT_UNKNOWN;
10177 /* Make sure that the derived type has been resolved and that the
10178 derived type is visible in the symbol's namespace, if it is a
10179 module function and is not PRIVATE. */
10180 if (sym->ts.type == BT_DERIVED
10181 && sym->ts.u.derived->attr.use_assoc
10182 && sym->ns->proc_name
10183 && sym->ns->proc_name->attr.flavor == FL_MODULE)
10187 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
10190 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
10191 if (!ds && sym->attr.function
10192 && gfc_check_access (sym->attr.access, sym->ns->default_access))
10194 symtree = gfc_new_symtree (&sym->ns->sym_root,
10195 sym->ts.u.derived->name);
10196 symtree->n.sym = sym->ts.u.derived;
10197 sym->ts.u.derived->refs++;
10201 /* Unless the derived-type declaration is use associated, Fortran 95
10202 does not allow public entries of private derived types.
10203 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
10204 161 in 95-006r3. */
10205 if (sym->ts.type == BT_DERIVED
10206 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
10207 && !sym->ts.u.derived->attr.use_assoc
10208 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10209 && !gfc_check_access (sym->ts.u.derived->attr.access,
10210 sym->ts.u.derived->ns->default_access)
10211 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
10212 "of PRIVATE derived type '%s'",
10213 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
10214 : "variable", sym->name, &sym->declared_at,
10215 sym->ts.u.derived->name) == FAILURE)
10218 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
10219 default initialization is defined (5.1.2.4.4). */
10220 if (sym->ts.type == BT_DERIVED
10222 && sym->attr.intent == INTENT_OUT
10224 && sym->as->type == AS_ASSUMED_SIZE)
10226 for (c = sym->ts.u.derived->components; c; c = c->next)
10228 if (c->initializer)
10230 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
10231 "ASSUMED SIZE and so cannot have a default initializer",
10232 sym->name, &sym->declared_at);
10238 switch (sym->attr.flavor)
10241 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
10246 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
10251 if (resolve_fl_namelist (sym) == FAILURE)
10256 if (resolve_fl_parameter (sym) == FAILURE)
10264 /* Resolve array specifier. Check as well some constraints
10265 on COMMON blocks. */
10267 check_constant = sym->attr.in_common && !sym->attr.pointer;
10269 /* Set the formal_arg_flag so that check_conflict will not throw
10270 an error for host associated variables in the specification
10271 expression for an array_valued function. */
10272 if (sym->attr.function && sym->as)
10273 formal_arg_flag = 1;
10275 gfc_resolve_array_spec (sym->as, check_constant);
10277 formal_arg_flag = 0;
10279 /* Resolve formal namespaces. */
10280 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
10281 && !sym->attr.contained && !sym->attr.intrinsic)
10282 gfc_resolve (sym->formal_ns);
10284 /* Make sure the formal namespace is present. */
10285 if (sym->formal && !sym->formal_ns)
10287 gfc_formal_arglist *formal = sym->formal;
10288 while (formal && !formal->sym)
10289 formal = formal->next;
10293 sym->formal_ns = formal->sym->ns;
10294 sym->formal_ns->refs++;
10298 /* Check threadprivate restrictions. */
10299 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
10300 && (!sym->attr.in_common
10301 && sym->module == NULL
10302 && (sym->ns->proc_name == NULL
10303 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
10304 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
10306 /* If we have come this far we can apply default-initializers, as
10307 described in 14.7.5, to those variables that have not already
10308 been assigned one. */
10309 if (sym->ts.type == BT_DERIVED
10310 && sym->attr.referenced
10311 && sym->ns == gfc_current_ns
10313 && !sym->attr.allocatable
10314 && !sym->attr.alloc_comp)
10316 symbol_attribute *a = &sym->attr;
10318 if ((!a->save && !a->dummy && !a->pointer
10319 && !a->in_common && !a->use_assoc
10320 && !(a->function && sym != sym->result))
10321 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
10322 apply_default_init (sym);
10325 /* If this symbol has a type-spec, check it. */
10326 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
10327 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
10328 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
10334 /************* Resolve DATA statements *************/
10338 gfc_data_value *vnode;
10344 /* Advance the values structure to point to the next value in the data list. */
10347 next_data_value (void)
10349 while (mpz_cmp_ui (values.left, 0) == 0)
10351 if (!gfc_is_constant_expr (values.vnode->expr))
10352 gfc_error ("non-constant DATA value at %L",
10353 &values.vnode->expr->where);
10355 if (values.vnode->next == NULL)
10358 values.vnode = values.vnode->next;
10359 mpz_set (values.left, values.vnode->repeat);
10367 check_data_variable (gfc_data_variable *var, locus *where)
10373 ar_type mark = AR_UNKNOWN;
10375 mpz_t section_index[GFC_MAX_DIMENSIONS];
10381 if (gfc_resolve_expr (var->expr) == FAILURE)
10385 mpz_init_set_si (offset, 0);
10388 if (e->expr_type != EXPR_VARIABLE)
10389 gfc_internal_error ("check_data_variable(): Bad expression");
10391 sym = e->symtree->n.sym;
10393 if (sym->ns->is_block_data && !sym->attr.in_common)
10395 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
10396 sym->name, &sym->declared_at);
10399 if (e->ref == NULL && sym->as)
10401 gfc_error ("DATA array '%s' at %L must be specified in a previous"
10402 " declaration", sym->name, where);
10406 has_pointer = sym->attr.pointer;
10408 for (ref = e->ref; ref; ref = ref->next)
10410 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
10414 && ref->type == REF_ARRAY
10415 && ref->u.ar.type != AR_FULL)
10417 gfc_error ("DATA element '%s' at %L is a pointer and so must "
10418 "be a full array", sym->name, where);
10423 if (e->rank == 0 || has_pointer)
10425 mpz_init_set_ui (size, 1);
10432 /* Find the array section reference. */
10433 for (ref = e->ref; ref; ref = ref->next)
10435 if (ref->type != REF_ARRAY)
10437 if (ref->u.ar.type == AR_ELEMENT)
10443 /* Set marks according to the reference pattern. */
10444 switch (ref->u.ar.type)
10452 /* Get the start position of array section. */
10453 gfc_get_section_index (ar, section_index, &offset);
10458 gcc_unreachable ();
10461 if (gfc_array_size (e, &size) == FAILURE)
10463 gfc_error ("Nonconstant array section at %L in DATA statement",
10465 mpz_clear (offset);
10472 while (mpz_cmp_ui (size, 0) > 0)
10474 if (next_data_value () == FAILURE)
10476 gfc_error ("DATA statement at %L has more variables than values",
10482 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
10486 /* If we have more than one element left in the repeat count,
10487 and we have more than one element left in the target variable,
10488 then create a range assignment. */
10489 /* FIXME: Only done for full arrays for now, since array sections
10491 if (mark == AR_FULL && ref && ref->next == NULL
10492 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
10496 if (mpz_cmp (size, values.left) >= 0)
10498 mpz_init_set (range, values.left);
10499 mpz_sub (size, size, values.left);
10500 mpz_set_ui (values.left, 0);
10504 mpz_init_set (range, size);
10505 mpz_sub (values.left, values.left, size);
10506 mpz_set_ui (size, 0);
10509 gfc_assign_data_value_range (var->expr, values.vnode->expr,
10512 mpz_add (offset, offset, range);
10516 /* Assign initial value to symbol. */
10519 mpz_sub_ui (values.left, values.left, 1);
10520 mpz_sub_ui (size, size, 1);
10522 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
10526 if (mark == AR_FULL)
10527 mpz_add_ui (offset, offset, 1);
10529 /* Modify the array section indexes and recalculate the offset
10530 for next element. */
10531 else if (mark == AR_SECTION)
10532 gfc_advance_section (section_index, ar, &offset);
10536 if (mark == AR_SECTION)
10538 for (i = 0; i < ar->dimen; i++)
10539 mpz_clear (section_index[i]);
10543 mpz_clear (offset);
10549 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
10551 /* Iterate over a list of elements in a DATA statement. */
10554 traverse_data_list (gfc_data_variable *var, locus *where)
10557 iterator_stack frame;
10558 gfc_expr *e, *start, *end, *step;
10559 gfc_try retval = SUCCESS;
10561 mpz_init (frame.value);
10563 start = gfc_copy_expr (var->iter.start);
10564 end = gfc_copy_expr (var->iter.end);
10565 step = gfc_copy_expr (var->iter.step);
10567 if (gfc_simplify_expr (start, 1) == FAILURE
10568 || start->expr_type != EXPR_CONSTANT)
10570 gfc_error ("iterator start at %L does not simplify", &start->where);
10574 if (gfc_simplify_expr (end, 1) == FAILURE
10575 || end->expr_type != EXPR_CONSTANT)
10577 gfc_error ("iterator end at %L does not simplify", &end->where);
10581 if (gfc_simplify_expr (step, 1) == FAILURE
10582 || step->expr_type != EXPR_CONSTANT)
10584 gfc_error ("iterator step at %L does not simplify", &step->where);
10589 mpz_init_set (trip, end->value.integer);
10590 mpz_sub (trip, trip, start->value.integer);
10591 mpz_add (trip, trip, step->value.integer);
10593 mpz_div (trip, trip, step->value.integer);
10595 mpz_set (frame.value, start->value.integer);
10597 frame.prev = iter_stack;
10598 frame.variable = var->iter.var->symtree;
10599 iter_stack = &frame;
10601 while (mpz_cmp_ui (trip, 0) > 0)
10603 if (traverse_data_var (var->list, where) == FAILURE)
10610 e = gfc_copy_expr (var->expr);
10611 if (gfc_simplify_expr (e, 1) == FAILURE)
10619 mpz_add (frame.value, frame.value, step->value.integer);
10621 mpz_sub_ui (trip, trip, 1);
10626 mpz_clear (frame.value);
10628 gfc_free_expr (start);
10629 gfc_free_expr (end);
10630 gfc_free_expr (step);
10632 iter_stack = frame.prev;
10637 /* Type resolve variables in the variable list of a DATA statement. */
10640 traverse_data_var (gfc_data_variable *var, locus *where)
10644 for (; var; var = var->next)
10646 if (var->expr == NULL)
10647 t = traverse_data_list (var, where);
10649 t = check_data_variable (var, where);
10659 /* Resolve the expressions and iterators associated with a data statement.
10660 This is separate from the assignment checking because data lists should
10661 only be resolved once. */
10664 resolve_data_variables (gfc_data_variable *d)
10666 for (; d; d = d->next)
10668 if (d->list == NULL)
10670 if (gfc_resolve_expr (d->expr) == FAILURE)
10675 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
10678 if (resolve_data_variables (d->list) == FAILURE)
10687 /* Resolve a single DATA statement. We implement this by storing a pointer to
10688 the value list into static variables, and then recursively traversing the
10689 variables list, expanding iterators and such. */
10692 resolve_data (gfc_data *d)
10695 if (resolve_data_variables (d->var) == FAILURE)
10698 values.vnode = d->value;
10699 if (d->value == NULL)
10700 mpz_set_ui (values.left, 0);
10702 mpz_set (values.left, d->value->repeat);
10704 if (traverse_data_var (d->var, &d->where) == FAILURE)
10707 /* At this point, we better not have any values left. */
10709 if (next_data_value () == SUCCESS)
10710 gfc_error ("DATA statement at %L has more values than variables",
10715 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
10716 accessed by host or use association, is a dummy argument to a pure function,
10717 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
10718 is storage associated with any such variable, shall not be used in the
10719 following contexts: (clients of this function). */
10721 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
10722 procedure. Returns zero if assignment is OK, nonzero if there is a
10725 gfc_impure_variable (gfc_symbol *sym)
10729 if (sym->attr.use_assoc || sym->attr.in_common)
10732 if (sym->ns != gfc_current_ns)
10733 return !sym->attr.function;
10735 proc = sym->ns->proc_name;
10736 if (sym->attr.dummy && gfc_pure (proc)
10737 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
10739 proc->attr.function))
10742 /* TODO: Sort out what can be storage associated, if anything, and include
10743 it here. In principle equivalences should be scanned but it does not
10744 seem to be possible to storage associate an impure variable this way. */
10749 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
10750 symbol of the current procedure. */
10753 gfc_pure (gfc_symbol *sym)
10755 symbol_attribute attr;
10758 sym = gfc_current_ns->proc_name;
10764 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
10768 /* Test whether the current procedure is elemental or not. */
10771 gfc_elemental (gfc_symbol *sym)
10773 symbol_attribute attr;
10776 sym = gfc_current_ns->proc_name;
10781 return attr.flavor == FL_PROCEDURE && attr.elemental;
10785 /* Warn about unused labels. */
10788 warn_unused_fortran_label (gfc_st_label *label)
10793 warn_unused_fortran_label (label->left);
10795 if (label->defined == ST_LABEL_UNKNOWN)
10798 switch (label->referenced)
10800 case ST_LABEL_UNKNOWN:
10801 gfc_warning ("Label %d at %L defined but not used", label->value,
10805 case ST_LABEL_BAD_TARGET:
10806 gfc_warning ("Label %d at %L defined but cannot be used",
10807 label->value, &label->where);
10814 warn_unused_fortran_label (label->right);
10818 /* Returns the sequence type of a symbol or sequence. */
10821 sequence_type (gfc_typespec ts)
10830 if (ts.u.derived->components == NULL)
10831 return SEQ_NONDEFAULT;
10833 result = sequence_type (ts.u.derived->components->ts);
10834 for (c = ts.u.derived->components->next; c; c = c->next)
10835 if (sequence_type (c->ts) != result)
10841 if (ts.kind != gfc_default_character_kind)
10842 return SEQ_NONDEFAULT;
10844 return SEQ_CHARACTER;
10847 if (ts.kind != gfc_default_integer_kind)
10848 return SEQ_NONDEFAULT;
10850 return SEQ_NUMERIC;
10853 if (!(ts.kind == gfc_default_real_kind
10854 || ts.kind == gfc_default_double_kind))
10855 return SEQ_NONDEFAULT;
10857 return SEQ_NUMERIC;
10860 if (ts.kind != gfc_default_complex_kind)
10861 return SEQ_NONDEFAULT;
10863 return SEQ_NUMERIC;
10866 if (ts.kind != gfc_default_logical_kind)
10867 return SEQ_NONDEFAULT;
10869 return SEQ_NUMERIC;
10872 return SEQ_NONDEFAULT;
10877 /* Resolve derived type EQUIVALENCE object. */
10880 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
10882 gfc_component *c = derived->components;
10887 /* Shall not be an object of nonsequence derived type. */
10888 if (!derived->attr.sequence)
10890 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
10891 "attribute to be an EQUIVALENCE object", sym->name,
10896 /* Shall not have allocatable components. */
10897 if (derived->attr.alloc_comp)
10899 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
10900 "components to be an EQUIVALENCE object",sym->name,
10905 if (sym->attr.in_common && has_default_initializer (sym->ts.u.derived))
10907 gfc_error ("Derived type variable '%s' at %L with default "
10908 "initialization cannot be in EQUIVALENCE with a variable "
10909 "in COMMON", sym->name, &e->where);
10913 for (; c ; c = c->next)
10915 if (c->ts.type == BT_DERIVED
10916 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
10919 /* Shall not be an object of sequence derived type containing a pointer
10920 in the structure. */
10921 if (c->attr.pointer)
10923 gfc_error ("Derived type variable '%s' at %L with pointer "
10924 "component(s) cannot be an EQUIVALENCE object",
10925 sym->name, &e->where);
10933 /* Resolve equivalence object.
10934 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
10935 an allocatable array, an object of nonsequence derived type, an object of
10936 sequence derived type containing a pointer at any level of component
10937 selection, an automatic object, a function name, an entry name, a result
10938 name, a named constant, a structure component, or a subobject of any of
10939 the preceding objects. A substring shall not have length zero. A
10940 derived type shall not have components with default initialization nor
10941 shall two objects of an equivalence group be initialized.
10942 Either all or none of the objects shall have an protected attribute.
10943 The simple constraints are done in symbol.c(check_conflict) and the rest
10944 are implemented here. */
10947 resolve_equivalence (gfc_equiv *eq)
10950 gfc_symbol *first_sym;
10953 locus *last_where = NULL;
10954 seq_type eq_type, last_eq_type;
10955 gfc_typespec *last_ts;
10956 int object, cnt_protected;
10957 const char *value_name;
10961 last_ts = &eq->expr->symtree->n.sym->ts;
10963 first_sym = eq->expr->symtree->n.sym;
10967 for (object = 1; eq; eq = eq->eq, object++)
10971 e->ts = e->symtree->n.sym->ts;
10972 /* match_varspec might not know yet if it is seeing
10973 array reference or substring reference, as it doesn't
10975 if (e->ref && e->ref->type == REF_ARRAY)
10977 gfc_ref *ref = e->ref;
10978 sym = e->symtree->n.sym;
10980 if (sym->attr.dimension)
10982 ref->u.ar.as = sym->as;
10986 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
10987 if (e->ts.type == BT_CHARACTER
10989 && ref->type == REF_ARRAY
10990 && ref->u.ar.dimen == 1
10991 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
10992 && ref->u.ar.stride[0] == NULL)
10994 gfc_expr *start = ref->u.ar.start[0];
10995 gfc_expr *end = ref->u.ar.end[0];
10998 /* Optimize away the (:) reference. */
10999 if (start == NULL && end == NULL)
11002 e->ref = ref->next;
11004 e->ref->next = ref->next;
11009 ref->type = REF_SUBSTRING;
11011 start = gfc_int_expr (1);
11012 ref->u.ss.start = start;
11013 if (end == NULL && e->ts.u.cl)
11014 end = gfc_copy_expr (e->ts.u.cl->length);
11015 ref->u.ss.end = end;
11016 ref->u.ss.length = e->ts.u.cl;
11023 /* Any further ref is an error. */
11026 gcc_assert (ref->type == REF_ARRAY);
11027 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
11033 if (gfc_resolve_expr (e) == FAILURE)
11036 sym = e->symtree->n.sym;
11038 if (sym->attr.is_protected)
11040 if (cnt_protected > 0 && cnt_protected != object)
11042 gfc_error ("Either all or none of the objects in the "
11043 "EQUIVALENCE set at %L shall have the "
11044 "PROTECTED attribute",
11049 /* Shall not equivalence common block variables in a PURE procedure. */
11050 if (sym->ns->proc_name
11051 && sym->ns->proc_name->attr.pure
11052 && sym->attr.in_common)
11054 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
11055 "object in the pure procedure '%s'",
11056 sym->name, &e->where, sym->ns->proc_name->name);
11060 /* Shall not be a named constant. */
11061 if (e->expr_type == EXPR_CONSTANT)
11063 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
11064 "object", sym->name, &e->where);
11068 if (e->ts.type == BT_DERIVED
11069 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
11072 /* Check that the types correspond correctly:
11074 A numeric sequence structure may be equivalenced to another sequence
11075 structure, an object of default integer type, default real type, double
11076 precision real type, default logical type such that components of the
11077 structure ultimately only become associated to objects of the same
11078 kind. A character sequence structure may be equivalenced to an object
11079 of default character kind or another character sequence structure.
11080 Other objects may be equivalenced only to objects of the same type and
11081 kind parameters. */
11083 /* Identical types are unconditionally OK. */
11084 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
11085 goto identical_types;
11087 last_eq_type = sequence_type (*last_ts);
11088 eq_type = sequence_type (sym->ts);
11090 /* Since the pair of objects is not of the same type, mixed or
11091 non-default sequences can be rejected. */
11093 msg = "Sequence %s with mixed components in EQUIVALENCE "
11094 "statement at %L with different type objects";
11096 && last_eq_type == SEQ_MIXED
11097 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
11099 || (eq_type == SEQ_MIXED
11100 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11101 &e->where) == FAILURE))
11104 msg = "Non-default type object or sequence %s in EQUIVALENCE "
11105 "statement at %L with objects of different type";
11107 && last_eq_type == SEQ_NONDEFAULT
11108 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
11109 last_where) == FAILURE)
11110 || (eq_type == SEQ_NONDEFAULT
11111 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11112 &e->where) == FAILURE))
11115 msg ="Non-CHARACTER object '%s' in default CHARACTER "
11116 "EQUIVALENCE statement at %L";
11117 if (last_eq_type == SEQ_CHARACTER
11118 && eq_type != SEQ_CHARACTER
11119 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11120 &e->where) == FAILURE)
11123 msg ="Non-NUMERIC object '%s' in default NUMERIC "
11124 "EQUIVALENCE statement at %L";
11125 if (last_eq_type == SEQ_NUMERIC
11126 && eq_type != SEQ_NUMERIC
11127 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11128 &e->where) == FAILURE)
11133 last_where = &e->where;
11138 /* Shall not be an automatic array. */
11139 if (e->ref->type == REF_ARRAY
11140 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
11142 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
11143 "an EQUIVALENCE object", sym->name, &e->where);
11150 /* Shall not be a structure component. */
11151 if (r->type == REF_COMPONENT)
11153 gfc_error ("Structure component '%s' at %L cannot be an "
11154 "EQUIVALENCE object",
11155 r->u.c.component->name, &e->where);
11159 /* A substring shall not have length zero. */
11160 if (r->type == REF_SUBSTRING)
11162 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
11164 gfc_error ("Substring at %L has length zero",
11165 &r->u.ss.start->where);
11175 /* Resolve function and ENTRY types, issue diagnostics if needed. */
11178 resolve_fntype (gfc_namespace *ns)
11180 gfc_entry_list *el;
11183 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
11186 /* If there are any entries, ns->proc_name is the entry master
11187 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
11189 sym = ns->entries->sym;
11191 sym = ns->proc_name;
11192 if (sym->result == sym
11193 && sym->ts.type == BT_UNKNOWN
11194 && gfc_set_default_type (sym, 0, NULL) == FAILURE
11195 && !sym->attr.untyped)
11197 gfc_error ("Function '%s' at %L has no IMPLICIT type",
11198 sym->name, &sym->declared_at);
11199 sym->attr.untyped = 1;
11202 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
11203 && !sym->attr.contained
11204 && !gfc_check_access (sym->ts.u.derived->attr.access,
11205 sym->ts.u.derived->ns->default_access)
11206 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11208 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
11209 "%L of PRIVATE type '%s'", sym->name,
11210 &sym->declared_at, sym->ts.u.derived->name);
11214 for (el = ns->entries->next; el; el = el->next)
11216 if (el->sym->result == el->sym
11217 && el->sym->ts.type == BT_UNKNOWN
11218 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
11219 && !el->sym->attr.untyped)
11221 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
11222 el->sym->name, &el->sym->declared_at);
11223 el->sym->attr.untyped = 1;
11229 /* 12.3.2.1.1 Defined operators. */
11232 check_uop_procedure (gfc_symbol *sym, locus where)
11234 gfc_formal_arglist *formal;
11236 if (!sym->attr.function)
11238 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
11239 sym->name, &where);
11243 if (sym->ts.type == BT_CHARACTER
11244 && !(sym->ts.u.cl && sym->ts.u.cl->length)
11245 && !(sym->result && sym->result->ts.u.cl
11246 && sym->result->ts.u.cl->length))
11248 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
11249 "character length", sym->name, &where);
11253 formal = sym->formal;
11254 if (!formal || !formal->sym)
11256 gfc_error ("User operator procedure '%s' at %L must have at least "
11257 "one argument", sym->name, &where);
11261 if (formal->sym->attr.intent != INTENT_IN)
11263 gfc_error ("First argument of operator interface at %L must be "
11264 "INTENT(IN)", &where);
11268 if (formal->sym->attr.optional)
11270 gfc_error ("First argument of operator interface at %L cannot be "
11271 "optional", &where);
11275 formal = formal->next;
11276 if (!formal || !formal->sym)
11279 if (formal->sym->attr.intent != INTENT_IN)
11281 gfc_error ("Second argument of operator interface at %L must be "
11282 "INTENT(IN)", &where);
11286 if (formal->sym->attr.optional)
11288 gfc_error ("Second argument of operator interface at %L cannot be "
11289 "optional", &where);
11295 gfc_error ("Operator interface at %L must have, at most, two "
11296 "arguments", &where);
11304 gfc_resolve_uops (gfc_symtree *symtree)
11306 gfc_interface *itr;
11308 if (symtree == NULL)
11311 gfc_resolve_uops (symtree->left);
11312 gfc_resolve_uops (symtree->right);
11314 for (itr = symtree->n.uop->op; itr; itr = itr->next)
11315 check_uop_procedure (itr->sym, itr->sym->declared_at);
11319 /* Examine all of the expressions associated with a program unit,
11320 assign types to all intermediate expressions, make sure that all
11321 assignments are to compatible types and figure out which names
11322 refer to which functions or subroutines. It doesn't check code
11323 block, which is handled by resolve_code. */
11326 resolve_types (gfc_namespace *ns)
11332 gfc_namespace* old_ns = gfc_current_ns;
11334 /* Check that all IMPLICIT types are ok. */
11335 if (!ns->seen_implicit_none)
11338 for (letter = 0; letter != GFC_LETTERS; ++letter)
11339 if (ns->set_flag[letter]
11340 && resolve_typespec_used (&ns->default_type[letter],
11341 &ns->implicit_loc[letter],
11346 gfc_current_ns = ns;
11348 resolve_entries (ns);
11350 resolve_common_vars (ns->blank_common.head, false);
11351 resolve_common_blocks (ns->common_root);
11353 resolve_contained_functions (ns);
11355 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
11357 for (cl = ns->cl_list; cl; cl = cl->next)
11358 resolve_charlen (cl);
11360 gfc_traverse_ns (ns, resolve_symbol);
11362 resolve_fntype (ns);
11364 for (n = ns->contained; n; n = n->sibling)
11366 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
11367 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
11368 "also be PURE", n->proc_name->name,
11369 &n->proc_name->declared_at);
11375 gfc_check_interfaces (ns);
11377 gfc_traverse_ns (ns, resolve_values);
11383 for (d = ns->data; d; d = d->next)
11387 gfc_traverse_ns (ns, gfc_formalize_init_value);
11389 gfc_traverse_ns (ns, gfc_verify_binding_labels);
11391 if (ns->common_root != NULL)
11392 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
11394 for (eq = ns->equiv; eq; eq = eq->next)
11395 resolve_equivalence (eq);
11397 /* Warn about unused labels. */
11398 if (warn_unused_label)
11399 warn_unused_fortran_label (ns->st_labels);
11401 gfc_resolve_uops (ns->uop_root);
11403 gfc_current_ns = old_ns;
11407 /* Call resolve_code recursively. */
11410 resolve_codes (gfc_namespace *ns)
11413 bitmap_obstack old_obstack;
11415 for (n = ns->contained; n; n = n->sibling)
11418 gfc_current_ns = ns;
11420 /* Set to an out of range value. */
11421 current_entry_id = -1;
11423 old_obstack = labels_obstack;
11424 bitmap_obstack_initialize (&labels_obstack);
11426 resolve_code (ns->code, ns);
11428 bitmap_obstack_release (&labels_obstack);
11429 labels_obstack = old_obstack;
11433 /* This function is called after a complete program unit has been compiled.
11434 Its purpose is to examine all of the expressions associated with a program
11435 unit, assign types to all intermediate expressions, make sure that all
11436 assignments are to compatible types and figure out which names refer to
11437 which functions or subroutines. */
11440 gfc_resolve (gfc_namespace *ns)
11442 gfc_namespace *old_ns;
11443 code_stack *old_cs_base;
11449 old_ns = gfc_current_ns;
11450 old_cs_base = cs_base;
11452 resolve_types (ns);
11453 resolve_codes (ns);
11455 gfc_current_ns = old_ns;
11456 cs_base = old_cs_base;