1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
28 #include "arith.h" /* For gfc_compare_expr(). */
29 #include "dependency.h"
31 #include "target-memory.h" /* for gfc_simplify_transfer */
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 and results of module
371 procedures are not on this list, 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)
378 /* See if this is a module-procedure and adapt error message
381 gcc_assert (ns->parent && ns->parent->proc_name);
382 module_proc = (ns->parent->proc_name->attr.flavor == FL_MODULE);
384 gfc_error ("Character-valued %s '%s' at %L must not be"
386 module_proc ? _("module procedure")
387 : _("internal function"),
388 sym->name, &sym->declared_at);
394 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
395 introduce duplicates. */
398 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
400 gfc_formal_arglist *f, *new_arglist;
403 for (; new_args != NULL; new_args = new_args->next)
405 new_sym = new_args->sym;
406 /* See if this arg is already in the formal argument list. */
407 for (f = proc->formal; f; f = f->next)
409 if (new_sym == f->sym)
416 /* Add a new argument. Argument order is not important. */
417 new_arglist = gfc_get_formal_arglist ();
418 new_arglist->sym = new_sym;
419 new_arglist->next = proc->formal;
420 proc->formal = new_arglist;
425 /* Flag the arguments that are not present in all entries. */
428 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
430 gfc_formal_arglist *f, *head;
433 for (f = proc->formal; f; f = f->next)
438 for (new_args = head; new_args; new_args = new_args->next)
440 if (new_args->sym == f->sym)
447 f->sym->attr.not_always_present = 1;
452 /* Resolve alternate entry points. If a symbol has multiple entry points we
453 create a new master symbol for the main routine, and turn the existing
454 symbol into an entry point. */
457 resolve_entries (gfc_namespace *ns)
459 gfc_namespace *old_ns;
463 char name[GFC_MAX_SYMBOL_LEN + 1];
464 static int master_count = 0;
466 if (ns->proc_name == NULL)
469 /* No need to do anything if this procedure doesn't have alternate entry
474 /* We may already have resolved alternate entry points. */
475 if (ns->proc_name->attr.entry_master)
478 /* If this isn't a procedure something has gone horribly wrong. */
479 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
481 /* Remember the current namespace. */
482 old_ns = gfc_current_ns;
486 /* Add the main entry point to the list of entry points. */
487 el = gfc_get_entry_list ();
488 el->sym = ns->proc_name;
490 el->next = ns->entries;
492 ns->proc_name->attr.entry = 1;
494 /* If it is a module function, it needs to be in the right namespace
495 so that gfc_get_fake_result_decl can gather up the results. The
496 need for this arose in get_proc_name, where these beasts were
497 left in their own namespace, to keep prior references linked to
498 the entry declaration.*/
499 if (ns->proc_name->attr.function
500 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
503 /* Do the same for entries where the master is not a module
504 procedure. These are retained in the module namespace because
505 of the module procedure declaration. */
506 for (el = el->next; el; el = el->next)
507 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
508 && el->sym->attr.mod_proc)
512 /* Add an entry statement for it. */
519 /* Create a new symbol for the master function. */
520 /* Give the internal function a unique name (within this file).
521 Also include the function name so the user has some hope of figuring
522 out what is going on. */
523 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
524 master_count++, ns->proc_name->name);
525 gfc_get_ha_symbol (name, &proc);
526 gcc_assert (proc != NULL);
528 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
529 if (ns->proc_name->attr.subroutine)
530 gfc_add_subroutine (&proc->attr, proc->name, NULL);
534 gfc_typespec *ts, *fts;
535 gfc_array_spec *as, *fas;
536 gfc_add_function (&proc->attr, proc->name, NULL);
538 fas = ns->entries->sym->as;
539 fas = fas ? fas : ns->entries->sym->result->as;
540 fts = &ns->entries->sym->result->ts;
541 if (fts->type == BT_UNKNOWN)
542 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
543 for (el = ns->entries->next; el; el = el->next)
545 ts = &el->sym->result->ts;
547 as = as ? as : el->sym->result->as;
548 if (ts->type == BT_UNKNOWN)
549 ts = gfc_get_default_type (el->sym->result->name, NULL);
551 if (! gfc_compare_types (ts, fts)
552 || (el->sym->result->attr.dimension
553 != ns->entries->sym->result->attr.dimension)
554 || (el->sym->result->attr.pointer
555 != ns->entries->sym->result->attr.pointer))
557 else if (as && fas && ns->entries->sym->result != el->sym->result
558 && gfc_compare_array_spec (as, fas) == 0)
559 gfc_error ("Function %s at %L has entries with mismatched "
560 "array specifications", ns->entries->sym->name,
561 &ns->entries->sym->declared_at);
562 /* The characteristics need to match and thus both need to have
563 the same string length, i.e. both len=*, or both len=4.
564 Having both len=<variable> is also possible, but difficult to
565 check at compile time. */
566 else if (ts->type == BT_CHARACTER && ts->u.cl && fts->u.cl
567 && (((ts->u.cl->length && !fts->u.cl->length)
568 ||(!ts->u.cl->length && fts->u.cl->length))
570 && ts->u.cl->length->expr_type
571 != fts->u.cl->length->expr_type)
573 && ts->u.cl->length->expr_type == EXPR_CONSTANT
574 && mpz_cmp (ts->u.cl->length->value.integer,
575 fts->u.cl->length->value.integer) != 0)))
576 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
577 "entries returning variables of different "
578 "string lengths", ns->entries->sym->name,
579 &ns->entries->sym->declared_at);
584 sym = ns->entries->sym->result;
585 /* All result types the same. */
587 if (sym->attr.dimension)
588 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
589 if (sym->attr.pointer)
590 gfc_add_pointer (&proc->attr, NULL);
594 /* Otherwise the result will be passed through a union by
596 proc->attr.mixed_entry_master = 1;
597 for (el = ns->entries; el; el = el->next)
599 sym = el->sym->result;
600 if (sym->attr.dimension)
602 if (el == ns->entries)
603 gfc_error ("FUNCTION result %s can't be an array 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 an array in "
608 "FUNCTION %s at %L", sym->name,
609 ns->entries->sym->name, &sym->declared_at);
611 else if (sym->attr.pointer)
613 if (el == ns->entries)
614 gfc_error ("FUNCTION result %s can't be a POINTER in "
615 "FUNCTION %s at %L", sym->name,
616 ns->entries->sym->name, &sym->declared_at);
618 gfc_error ("ENTRY result %s can't be a POINTER in "
619 "FUNCTION %s at %L", sym->name,
620 ns->entries->sym->name, &sym->declared_at);
625 if (ts->type == BT_UNKNOWN)
626 ts = gfc_get_default_type (sym->name, NULL);
630 if (ts->kind == gfc_default_integer_kind)
634 if (ts->kind == gfc_default_real_kind
635 || ts->kind == gfc_default_double_kind)
639 if (ts->kind == gfc_default_complex_kind)
643 if (ts->kind == gfc_default_logical_kind)
647 /* We will issue error elsewhere. */
655 if (el == ns->entries)
656 gfc_error ("FUNCTION result %s can't be of type %s "
657 "in FUNCTION %s at %L", sym->name,
658 gfc_typename (ts), ns->entries->sym->name,
661 gfc_error ("ENTRY result %s can't be of type %s "
662 "in FUNCTION %s at %L", sym->name,
663 gfc_typename (ts), ns->entries->sym->name,
670 proc->attr.access = ACCESS_PRIVATE;
671 proc->attr.entry_master = 1;
673 /* Merge all the entry point arguments. */
674 for (el = ns->entries; el; el = el->next)
675 merge_argument_lists (proc, el->sym->formal);
677 /* Check the master formal arguments for any that are not
678 present in all entry points. */
679 for (el = ns->entries; el; el = el->next)
680 check_argument_lists (proc, el->sym->formal);
682 /* Use the master function for the function body. */
683 ns->proc_name = proc;
685 /* Finalize the new symbols. */
686 gfc_commit_symbols ();
688 /* Restore the original namespace. */
689 gfc_current_ns = old_ns;
694 has_default_initializer (gfc_symbol *der)
698 gcc_assert (der->attr.flavor == FL_DERIVED);
699 for (c = der->components; c; c = c->next)
700 if ((c->ts.type != BT_DERIVED && c->initializer)
701 || (c->ts.type == BT_DERIVED
702 && (!c->attr.pointer && has_default_initializer (c->ts.u.derived))))
708 /* Resolve common variables. */
710 resolve_common_vars (gfc_symbol *sym, bool named_common)
712 gfc_symbol *csym = sym;
714 for (; csym; csym = csym->common_next)
716 if (csym->value || csym->attr.data)
718 if (!csym->ns->is_block_data)
719 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
720 "but only in BLOCK DATA initialization is "
721 "allowed", csym->name, &csym->declared_at);
722 else if (!named_common)
723 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
724 "in a blank COMMON but initialization is only "
725 "allowed in named common blocks", csym->name,
729 if (csym->ts.type != BT_DERIVED)
732 if (!(csym->ts.u.derived->attr.sequence
733 || csym->ts.u.derived->attr.is_bind_c))
734 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
735 "has neither the SEQUENCE nor the BIND(C) "
736 "attribute", csym->name, &csym->declared_at);
737 if (csym->ts.u.derived->attr.alloc_comp)
738 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
739 "has an ultimate component that is "
740 "allocatable", csym->name, &csym->declared_at);
741 if (has_default_initializer (csym->ts.u.derived))
742 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
743 "may not have default initializer", csym->name,
746 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
747 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
751 /* Resolve common blocks. */
753 resolve_common_blocks (gfc_symtree *common_root)
757 if (common_root == NULL)
760 if (common_root->left)
761 resolve_common_blocks (common_root->left);
762 if (common_root->right)
763 resolve_common_blocks (common_root->right);
765 resolve_common_vars (common_root->n.common->head, true);
767 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
771 if (sym->attr.flavor == FL_PARAMETER)
772 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
773 sym->name, &common_root->n.common->where, &sym->declared_at);
775 if (sym->attr.intrinsic)
776 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
777 sym->name, &common_root->n.common->where);
778 else if (sym->attr.result
779 || gfc_is_function_return_value (sym, gfc_current_ns))
780 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
781 "that is also a function result", sym->name,
782 &common_root->n.common->where);
783 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
784 && sym->attr.proc != PROC_ST_FUNCTION)
785 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
786 "that is also a global procedure", sym->name,
787 &common_root->n.common->where);
791 /* Resolve contained function types. Because contained functions can call one
792 another, they have to be worked out before any of the contained procedures
795 The good news is that if a function doesn't already have a type, the only
796 way it can get one is through an IMPLICIT type or a RESULT variable, because
797 by definition contained functions are contained namespace they're contained
798 in, not in a sibling or parent namespace. */
801 resolve_contained_functions (gfc_namespace *ns)
803 gfc_namespace *child;
806 resolve_formal_arglists (ns);
808 for (child = ns->contained; child; child = child->sibling)
810 /* Resolve alternate entry points first. */
811 resolve_entries (child);
813 /* Then check function return types. */
814 resolve_contained_fntype (child->proc_name, child);
815 for (el = child->entries; el; el = el->next)
816 resolve_contained_fntype (el->sym, child);
821 /* Resolve all of the elements of a structure constructor and make sure that
822 the types are correct. */
825 resolve_structure_cons (gfc_expr *expr)
827 gfc_constructor *cons;
833 cons = expr->value.constructor;
834 /* A constructor may have references if it is the result of substituting a
835 parameter variable. In this case we just pull out the component we
838 comp = expr->ref->u.c.sym->components;
840 comp = expr->ts.u.derived->components;
842 /* See if the user is trying to invoke a structure constructor for one of
843 the iso_c_binding derived types. */
844 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
845 && expr->ts.u.derived->ts.is_iso_c && cons
846 && (cons->expr == NULL || cons->expr->expr_type != EXPR_NULL))
848 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
849 expr->ts.u.derived->name, &(expr->where));
853 /* Return if structure constructor is c_null_(fun)prt. */
854 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
855 && expr->ts.u.derived->ts.is_iso_c && cons
856 && cons->expr && cons->expr->expr_type == EXPR_NULL)
859 for (; comp; comp = comp->next, cons = cons->next)
866 if (gfc_resolve_expr (cons->expr) == FAILURE)
872 rank = comp->as ? comp->as->rank : 0;
873 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
874 && (comp->attr.allocatable || cons->expr->rank))
876 gfc_error ("The rank of the element in the derived type "
877 "constructor at %L does not match that of the "
878 "component (%d/%d)", &cons->expr->where,
879 cons->expr->rank, rank);
883 /* If we don't have the right type, try to convert it. */
885 if (!gfc_compare_types (&cons->expr->ts, &comp->ts))
888 if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
889 gfc_error ("The element in the derived type constructor at %L, "
890 "for pointer component '%s', is %s but should be %s",
891 &cons->expr->where, comp->name,
892 gfc_basic_typename (cons->expr->ts.type),
893 gfc_basic_typename (comp->ts.type));
895 t = gfc_convert_type (cons->expr, &comp->ts, 1);
898 if (cons->expr->expr_type == EXPR_NULL
899 && !(comp->attr.pointer || comp->attr.allocatable
900 || comp->attr.proc_pointer
901 || (comp->ts.type == BT_CLASS
902 && (comp->ts.u.derived->components->attr.pointer
903 || comp->ts.u.derived->components->attr.allocatable))))
906 gfc_error ("The NULL in the derived type constructor at %L is "
907 "being applied to component '%s', which is neither "
908 "a POINTER nor ALLOCATABLE", &cons->expr->where,
912 if (!comp->attr.pointer || cons->expr->expr_type == EXPR_NULL)
915 a = gfc_expr_attr (cons->expr);
917 if (!a.pointer && !a.target)
920 gfc_error ("The element in the derived type constructor at %L, "
921 "for pointer component '%s' should be a POINTER or "
922 "a TARGET", &cons->expr->where, comp->name);
930 /****************** Expression name resolution ******************/
932 /* Returns 0 if a symbol was not declared with a type or
933 attribute declaration statement, nonzero otherwise. */
936 was_declared (gfc_symbol *sym)
942 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
945 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
946 || a.optional || a.pointer || a.save || a.target || a.volatile_
947 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
955 /* Determine if a symbol is generic or not. */
958 generic_sym (gfc_symbol *sym)
962 if (sym->attr.generic ||
963 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
966 if (was_declared (sym) || sym->ns->parent == NULL)
969 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
976 return generic_sym (s);
983 /* Determine if a symbol is specific or not. */
986 specific_sym (gfc_symbol *sym)
990 if (sym->attr.if_source == IFSRC_IFBODY
991 || sym->attr.proc == PROC_MODULE
992 || sym->attr.proc == PROC_INTERNAL
993 || sym->attr.proc == PROC_ST_FUNCTION
994 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
995 || sym->attr.external)
998 if (was_declared (sym) || sym->ns->parent == NULL)
1001 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1003 return (s == NULL) ? 0 : specific_sym (s);
1007 /* Figure out if the procedure is specific, generic or unknown. */
1010 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1014 procedure_kind (gfc_symbol *sym)
1016 if (generic_sym (sym))
1017 return PTYPE_GENERIC;
1019 if (specific_sym (sym))
1020 return PTYPE_SPECIFIC;
1022 return PTYPE_UNKNOWN;
1025 /* Check references to assumed size arrays. The flag need_full_assumed_size
1026 is nonzero when matching actual arguments. */
1028 static int need_full_assumed_size = 0;
1031 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1033 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1036 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1037 What should it be? */
1038 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1039 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1040 && (e->ref->u.ar.type == AR_FULL))
1042 gfc_error ("The upper bound in the last dimension must "
1043 "appear in the reference to the assumed size "
1044 "array '%s' at %L", sym->name, &e->where);
1051 /* Look for bad assumed size array references in argument expressions
1052 of elemental and array valued intrinsic procedures. Since this is
1053 called from procedure resolution functions, it only recurses at
1057 resolve_assumed_size_actual (gfc_expr *e)
1062 switch (e->expr_type)
1065 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1070 if (resolve_assumed_size_actual (e->value.op.op1)
1071 || resolve_assumed_size_actual (e->value.op.op2))
1082 /* Check a generic procedure, passed as an actual argument, to see if
1083 there is a matching specific name. If none, it is an error, and if
1084 more than one, the reference is ambiguous. */
1086 count_specific_procs (gfc_expr *e)
1093 sym = e->symtree->n.sym;
1095 for (p = sym->generic; p; p = p->next)
1096 if (strcmp (sym->name, p->sym->name) == 0)
1098 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1104 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1108 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1109 "argument at %L", sym->name, &e->where);
1115 /* See if a call to sym could possibly be a not allowed RECURSION because of
1116 a missing RECURIVE declaration. This means that either sym is the current
1117 context itself, or sym is the parent of a contained procedure calling its
1118 non-RECURSIVE containing procedure.
1119 This also works if sym is an ENTRY. */
1122 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1124 gfc_symbol* proc_sym;
1125 gfc_symbol* context_proc;
1126 gfc_namespace* real_context;
1128 if (sym->attr.flavor == FL_PROGRAM)
1131 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1133 /* If we've got an ENTRY, find real procedure. */
1134 if (sym->attr.entry && sym->ns->entries)
1135 proc_sym = sym->ns->entries->sym;
1139 /* If sym is RECURSIVE, all is well of course. */
1140 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1143 /* Find the context procedure's "real" symbol if it has entries.
1144 We look for a procedure symbol, so recurse on the parents if we don't
1145 find one (like in case of a BLOCK construct). */
1146 for (real_context = context; ; real_context = real_context->parent)
1148 /* We should find something, eventually! */
1149 gcc_assert (real_context);
1151 context_proc = (real_context->entries ? real_context->entries->sym
1152 : real_context->proc_name);
1154 /* In some special cases, there may not be a proc_name, like for this
1156 real(bad_kind()) function foo () ...
1157 when checking the call to bad_kind ().
1158 In these cases, we simply return here and assume that the
1163 if (context_proc->attr.flavor != FL_LABEL)
1167 /* A call from sym's body to itself is recursion, of course. */
1168 if (context_proc == proc_sym)
1171 /* The same is true if context is a contained procedure and sym the
1173 if (context_proc->attr.contained)
1175 gfc_symbol* parent_proc;
1177 gcc_assert (context->parent);
1178 parent_proc = (context->parent->entries ? context->parent->entries->sym
1179 : context->parent->proc_name);
1181 if (parent_proc == proc_sym)
1189 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1190 its typespec and formal argument list. */
1193 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1195 gfc_intrinsic_sym* isym;
1201 /* We already know this one is an intrinsic, so we don't call
1202 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1203 gfc_find_subroutine directly to check whether it is a function or
1206 if ((isym = gfc_find_function (sym->name)))
1208 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1209 && !sym->attr.implicit_type)
1210 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1211 " ignored", sym->name, &sym->declared_at);
1213 if (!sym->attr.function &&
1214 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1219 else if ((isym = gfc_find_subroutine (sym->name)))
1221 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1223 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1224 " specifier", sym->name, &sym->declared_at);
1228 if (!sym->attr.subroutine &&
1229 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1234 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1239 gfc_copy_formal_args_intr (sym, isym);
1241 /* Check it is actually available in the standard settings. */
1242 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1245 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1246 " available in the current standard settings but %s. Use"
1247 " an appropriate -std=* option or enable -fall-intrinsics"
1248 " in order to use it.",
1249 sym->name, &sym->declared_at, symstd);
1257 /* Resolve a procedure expression, like passing it to a called procedure or as
1258 RHS for a procedure pointer assignment. */
1261 resolve_procedure_expression (gfc_expr* expr)
1265 if (expr->expr_type != EXPR_VARIABLE)
1267 gcc_assert (expr->symtree);
1269 sym = expr->symtree->n.sym;
1271 if (sym->attr.intrinsic)
1272 resolve_intrinsic (sym, &expr->where);
1274 if (sym->attr.flavor != FL_PROCEDURE
1275 || (sym->attr.function && sym->result == sym))
1278 /* A non-RECURSIVE procedure that is used as procedure expression within its
1279 own body is in danger of being called recursively. */
1280 if (is_illegal_recursion (sym, gfc_current_ns))
1281 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1282 " itself recursively. Declare it RECURSIVE or use"
1283 " -frecursive", sym->name, &expr->where);
1289 /* Resolve an actual argument list. Most of the time, this is just
1290 resolving the expressions in the list.
1291 The exception is that we sometimes have to decide whether arguments
1292 that look like procedure arguments are really simple variable
1296 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1297 bool no_formal_args)
1300 gfc_symtree *parent_st;
1302 int save_need_full_assumed_size;
1303 gfc_component *comp;
1305 for (; arg; arg = arg->next)
1310 /* Check the label is a valid branching target. */
1313 if (arg->label->defined == ST_LABEL_UNKNOWN)
1315 gfc_error ("Label %d referenced at %L is never defined",
1316 arg->label->value, &arg->label->where);
1323 if (gfc_is_proc_ptr_comp (e, &comp))
1326 if (e->expr_type == EXPR_PPC)
1328 if (comp->as != NULL)
1329 e->rank = comp->as->rank;
1330 e->expr_type = EXPR_FUNCTION;
1332 if (gfc_resolve_expr (e) == FAILURE)
1337 if (e->expr_type == EXPR_VARIABLE
1338 && e->symtree->n.sym->attr.generic
1340 && count_specific_procs (e) != 1)
1343 if (e->ts.type != BT_PROCEDURE)
1345 save_need_full_assumed_size = need_full_assumed_size;
1346 if (e->expr_type != EXPR_VARIABLE)
1347 need_full_assumed_size = 0;
1348 if (gfc_resolve_expr (e) != SUCCESS)
1350 need_full_assumed_size = save_need_full_assumed_size;
1354 /* See if the expression node should really be a variable reference. */
1356 sym = e->symtree->n.sym;
1358 if (sym->attr.flavor == FL_PROCEDURE
1359 || sym->attr.intrinsic
1360 || sym->attr.external)
1364 /* If a procedure is not already determined to be something else
1365 check if it is intrinsic. */
1366 if (!sym->attr.intrinsic
1367 && !(sym->attr.external || sym->attr.use_assoc
1368 || sym->attr.if_source == IFSRC_IFBODY)
1369 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1370 sym->attr.intrinsic = 1;
1372 if (sym->attr.proc == PROC_ST_FUNCTION)
1374 gfc_error ("Statement function '%s' at %L is not allowed as an "
1375 "actual argument", sym->name, &e->where);
1378 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1379 sym->attr.subroutine);
1380 if (sym->attr.intrinsic && actual_ok == 0)
1382 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1383 "actual argument", sym->name, &e->where);
1386 if (sym->attr.contained && !sym->attr.use_assoc
1387 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1389 gfc_error ("Internal procedure '%s' is not allowed as an "
1390 "actual argument at %L", sym->name, &e->where);
1393 if (sym->attr.elemental && !sym->attr.intrinsic)
1395 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1396 "allowed as an actual argument at %L", sym->name,
1400 /* Check if a generic interface has a specific procedure
1401 with the same name before emitting an error. */
1402 if (sym->attr.generic && count_specific_procs (e) != 1)
1405 /* Just in case a specific was found for the expression. */
1406 sym = e->symtree->n.sym;
1408 /* If the symbol is the function that names the current (or
1409 parent) scope, then we really have a variable reference. */
1411 if (gfc_is_function_return_value (sym, sym->ns))
1414 /* If all else fails, see if we have a specific intrinsic. */
1415 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1417 gfc_intrinsic_sym *isym;
1419 isym = gfc_find_function (sym->name);
1420 if (isym == NULL || !isym->specific)
1422 gfc_error ("Unable to find a specific INTRINSIC procedure "
1423 "for the reference '%s' at %L", sym->name,
1428 sym->attr.intrinsic = 1;
1429 sym->attr.function = 1;
1432 if (gfc_resolve_expr (e) == FAILURE)
1437 /* See if the name is a module procedure in a parent unit. */
1439 if (was_declared (sym) || sym->ns->parent == NULL)
1442 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1444 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1448 if (parent_st == NULL)
1451 sym = parent_st->n.sym;
1452 e->symtree = parent_st; /* Point to the right thing. */
1454 if (sym->attr.flavor == FL_PROCEDURE
1455 || sym->attr.intrinsic
1456 || sym->attr.external)
1458 if (gfc_resolve_expr (e) == FAILURE)
1464 e->expr_type = EXPR_VARIABLE;
1466 if (sym->as != NULL)
1468 e->rank = sym->as->rank;
1469 e->ref = gfc_get_ref ();
1470 e->ref->type = REF_ARRAY;
1471 e->ref->u.ar.type = AR_FULL;
1472 e->ref->u.ar.as = sym->as;
1475 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1476 primary.c (match_actual_arg). If above code determines that it
1477 is a variable instead, it needs to be resolved as it was not
1478 done at the beginning of this function. */
1479 save_need_full_assumed_size = need_full_assumed_size;
1480 if (e->expr_type != EXPR_VARIABLE)
1481 need_full_assumed_size = 0;
1482 if (gfc_resolve_expr (e) != SUCCESS)
1484 need_full_assumed_size = save_need_full_assumed_size;
1487 /* Check argument list functions %VAL, %LOC and %REF. There is
1488 nothing to do for %REF. */
1489 if (arg->name && arg->name[0] == '%')
1491 if (strncmp ("%VAL", arg->name, 4) == 0)
1493 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1495 gfc_error ("By-value argument at %L is not of numeric "
1502 gfc_error ("By-value argument at %L cannot be an array or "
1503 "an array section", &e->where);
1507 /* Intrinsics are still PROC_UNKNOWN here. However,
1508 since same file external procedures are not resolvable
1509 in gfortran, it is a good deal easier to leave them to
1511 if (ptype != PROC_UNKNOWN
1512 && ptype != PROC_DUMMY
1513 && ptype != PROC_EXTERNAL
1514 && ptype != PROC_MODULE)
1516 gfc_error ("By-value argument at %L is not allowed "
1517 "in this context", &e->where);
1522 /* Statement functions have already been excluded above. */
1523 else if (strncmp ("%LOC", arg->name, 4) == 0
1524 && e->ts.type == BT_PROCEDURE)
1526 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1528 gfc_error ("Passing internal procedure at %L by location "
1529 "not allowed", &e->where);
1540 /* Do the checks of the actual argument list that are specific to elemental
1541 procedures. If called with c == NULL, we have a function, otherwise if
1542 expr == NULL, we have a subroutine. */
1545 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1547 gfc_actual_arglist *arg0;
1548 gfc_actual_arglist *arg;
1549 gfc_symbol *esym = NULL;
1550 gfc_intrinsic_sym *isym = NULL;
1552 gfc_intrinsic_arg *iformal = NULL;
1553 gfc_formal_arglist *eformal = NULL;
1554 bool formal_optional = false;
1555 bool set_by_optional = false;
1559 /* Is this an elemental procedure? */
1560 if (expr && expr->value.function.actual != NULL)
1562 if (expr->value.function.esym != NULL
1563 && expr->value.function.esym->attr.elemental)
1565 arg0 = expr->value.function.actual;
1566 esym = expr->value.function.esym;
1568 else if (expr->value.function.isym != NULL
1569 && expr->value.function.isym->elemental)
1571 arg0 = expr->value.function.actual;
1572 isym = expr->value.function.isym;
1577 else if (c && c->ext.actual != NULL)
1579 arg0 = c->ext.actual;
1581 if (c->resolved_sym)
1582 esym = c->resolved_sym;
1584 esym = c->symtree->n.sym;
1587 if (!esym->attr.elemental)
1593 /* The rank of an elemental is the rank of its array argument(s). */
1594 for (arg = arg0; arg; arg = arg->next)
1596 if (arg->expr != NULL && arg->expr->rank > 0)
1598 rank = arg->expr->rank;
1599 if (arg->expr->expr_type == EXPR_VARIABLE
1600 && arg->expr->symtree->n.sym->attr.optional)
1601 set_by_optional = true;
1603 /* Function specific; set the result rank and shape. */
1607 if (!expr->shape && arg->expr->shape)
1609 expr->shape = gfc_get_shape (rank);
1610 for (i = 0; i < rank; i++)
1611 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1618 /* If it is an array, it shall not be supplied as an actual argument
1619 to an elemental procedure unless an array of the same rank is supplied
1620 as an actual argument corresponding to a nonoptional dummy argument of
1621 that elemental procedure(12.4.1.5). */
1622 formal_optional = false;
1624 iformal = isym->formal;
1626 eformal = esym->formal;
1628 for (arg = arg0; arg; arg = arg->next)
1632 if (eformal->sym && eformal->sym->attr.optional)
1633 formal_optional = true;
1634 eformal = eformal->next;
1636 else if (isym && iformal)
1638 if (iformal->optional)
1639 formal_optional = true;
1640 iformal = iformal->next;
1643 formal_optional = true;
1645 if (pedantic && arg->expr != NULL
1646 && arg->expr->expr_type == EXPR_VARIABLE
1647 && arg->expr->symtree->n.sym->attr.optional
1650 && (set_by_optional || arg->expr->rank != rank)
1651 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1653 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1654 "MISSING, it cannot be the actual argument of an "
1655 "ELEMENTAL procedure unless there is a non-optional "
1656 "argument with the same rank (12.4.1.5)",
1657 arg->expr->symtree->n.sym->name, &arg->expr->where);
1662 for (arg = arg0; arg; arg = arg->next)
1664 if (arg->expr == NULL || arg->expr->rank == 0)
1667 /* Being elemental, the last upper bound of an assumed size array
1668 argument must be present. */
1669 if (resolve_assumed_size_actual (arg->expr))
1672 /* Elemental procedure's array actual arguments must conform. */
1675 if (gfc_check_conformance (arg->expr, e,
1676 "elemental procedure") == FAILURE)
1683 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1684 is an array, the intent inout/out variable needs to be also an array. */
1685 if (rank > 0 && esym && expr == NULL)
1686 for (eformal = esym->formal, arg = arg0; arg && eformal;
1687 arg = arg->next, eformal = eformal->next)
1688 if ((eformal->sym->attr.intent == INTENT_OUT
1689 || eformal->sym->attr.intent == INTENT_INOUT)
1690 && arg->expr && arg->expr->rank == 0)
1692 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1693 "ELEMENTAL subroutine '%s' is a scalar, but another "
1694 "actual argument is an array", &arg->expr->where,
1695 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1696 : "INOUT", eformal->sym->name, esym->name);
1703 /* Go through each actual argument in ACTUAL and see if it can be
1704 implemented as an inlined, non-copying intrinsic. FNSYM is the
1705 function being called, or NULL if not known. */
1708 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1710 gfc_actual_arglist *ap;
1713 for (ap = actual; ap; ap = ap->next)
1715 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1716 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1718 ap->expr->inline_noncopying_intrinsic = 1;
1722 /* This function does the checking of references to global procedures
1723 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1724 77 and 95 standards. It checks for a gsymbol for the name, making
1725 one if it does not already exist. If it already exists, then the
1726 reference being resolved must correspond to the type of gsymbol.
1727 Otherwise, the new symbol is equipped with the attributes of the
1728 reference. The corresponding code that is called in creating
1729 global entities is parse.c.
1731 In addition, for all but -std=legacy, the gsymbols are used to
1732 check the interfaces of external procedures from the same file.
1733 The namespace of the gsymbol is resolved and then, once this is
1734 done the interface is checked. */
1738 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1740 if (!gsym_ns->proc_name->attr.recursive)
1743 if (sym->ns == gsym_ns)
1746 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1753 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1755 if (gsym_ns->entries)
1757 gfc_entry_list *entry = gsym_ns->entries;
1759 for (; entry; entry = entry->next)
1761 if (strcmp (sym->name, entry->sym->name) == 0)
1763 if (strcmp (gsym_ns->proc_name->name,
1764 sym->ns->proc_name->name) == 0)
1768 && strcmp (gsym_ns->proc_name->name,
1769 sym->ns->parent->proc_name->name) == 0)
1778 resolve_global_procedure (gfc_symbol *sym, locus *where,
1779 gfc_actual_arglist **actual, int sub)
1783 enum gfc_symbol_type type;
1785 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1787 gsym = gfc_get_gsymbol (sym->name);
1789 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1790 gfc_global_used (gsym, where);
1792 if (gfc_option.flag_whole_file
1793 && sym->attr.if_source == IFSRC_UNKNOWN
1794 && gsym->type != GSYM_UNKNOWN
1796 && gsym->ns->resolved != -1
1797 && gsym->ns->proc_name
1798 && not_in_recursive (sym, gsym->ns)
1799 && not_entry_self_reference (sym, gsym->ns))
1801 /* Make sure that translation for the gsymbol occurs before
1802 the procedure currently being resolved. */
1803 ns = gsym->ns->resolved ? NULL : gfc_global_ns_list;
1804 for (; ns && ns != gsym->ns; ns = ns->sibling)
1806 if (ns->sibling == gsym->ns)
1808 ns->sibling = gsym->ns->sibling;
1809 gsym->ns->sibling = gfc_global_ns_list;
1810 gfc_global_ns_list = gsym->ns;
1815 if (!gsym->ns->resolved)
1817 gfc_dt_list *old_dt_list;
1819 /* Stash away derived types so that the backend_decls do not
1821 old_dt_list = gfc_derived_types;
1822 gfc_derived_types = NULL;
1824 gfc_resolve (gsym->ns);
1826 /* Store the new derived types with the global namespace. */
1827 if (gfc_derived_types)
1828 gsym->ns->derived_types = gfc_derived_types;
1830 /* Restore the derived types of this namespace. */
1831 gfc_derived_types = old_dt_list;
1834 if (gsym->ns->proc_name->attr.function
1835 && gsym->ns->proc_name->as
1836 && gsym->ns->proc_name->as->rank
1837 && (!sym->as || sym->as->rank != gsym->ns->proc_name->as->rank))
1838 gfc_error ("The reference to function '%s' at %L either needs an "
1839 "explicit INTERFACE or the rank is incorrect", sym->name,
1842 /* Non-assumed length character functions. */
1843 if (sym->attr.function && sym->ts.type == BT_CHARACTER
1844 && gsym->ns->proc_name->ts.u.cl->length != NULL)
1846 gfc_charlen *cl = sym->ts.u.cl;
1848 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
1849 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
1851 gfc_error ("Nonconstant character-length function '%s' at %L "
1852 "must have an explicit interface", sym->name,
1857 if (gfc_option.flag_whole_file == 1
1858 || ((gfc_option.warn_std & GFC_STD_LEGACY)
1860 !(gfc_option.warn_std & GFC_STD_GNU)))
1861 gfc_errors_to_warnings (1);
1863 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1865 gfc_errors_to_warnings (0);
1868 if (gsym->type == GSYM_UNKNOWN)
1871 gsym->where = *where;
1878 /************* Function resolution *************/
1880 /* Resolve a function call known to be generic.
1881 Section 14.1.2.4.1. */
1884 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1888 if (sym->attr.generic)
1890 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1893 expr->value.function.name = s->name;
1894 expr->value.function.esym = s;
1896 if (s->ts.type != BT_UNKNOWN)
1898 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1899 expr->ts = s->result->ts;
1902 expr->rank = s->as->rank;
1903 else if (s->result != NULL && s->result->as != NULL)
1904 expr->rank = s->result->as->rank;
1906 gfc_set_sym_referenced (expr->value.function.esym);
1911 /* TODO: Need to search for elemental references in generic
1915 if (sym->attr.intrinsic)
1916 return gfc_intrinsic_func_interface (expr, 0);
1923 resolve_generic_f (gfc_expr *expr)
1928 sym = expr->symtree->n.sym;
1932 m = resolve_generic_f0 (expr, sym);
1935 else if (m == MATCH_ERROR)
1939 if (sym->ns->parent == NULL)
1941 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1945 if (!generic_sym (sym))
1949 /* Last ditch attempt. See if the reference is to an intrinsic
1950 that possesses a matching interface. 14.1.2.4 */
1951 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
1953 gfc_error ("There is no specific function for the generic '%s' at %L",
1954 expr->symtree->n.sym->name, &expr->where);
1958 m = gfc_intrinsic_func_interface (expr, 0);
1962 gfc_error ("Generic function '%s' at %L is not consistent with a "
1963 "specific intrinsic interface", expr->symtree->n.sym->name,
1970 /* Resolve a function call known to be specific. */
1973 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
1977 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
1979 if (sym->attr.dummy)
1981 sym->attr.proc = PROC_DUMMY;
1985 sym->attr.proc = PROC_EXTERNAL;
1989 if (sym->attr.proc == PROC_MODULE
1990 || sym->attr.proc == PROC_ST_FUNCTION
1991 || sym->attr.proc == PROC_INTERNAL)
1994 if (sym->attr.intrinsic)
1996 m = gfc_intrinsic_func_interface (expr, 1);
2000 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2001 "with an intrinsic", sym->name, &expr->where);
2009 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2012 expr->ts = sym->result->ts;
2015 expr->value.function.name = sym->name;
2016 expr->value.function.esym = sym;
2017 if (sym->as != NULL)
2018 expr->rank = sym->as->rank;
2025 resolve_specific_f (gfc_expr *expr)
2030 sym = expr->symtree->n.sym;
2034 m = resolve_specific_f0 (sym, expr);
2037 if (m == MATCH_ERROR)
2040 if (sym->ns->parent == NULL)
2043 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2049 gfc_error ("Unable to resolve the specific function '%s' at %L",
2050 expr->symtree->n.sym->name, &expr->where);
2056 /* Resolve a procedure call not known to be generic nor specific. */
2059 resolve_unknown_f (gfc_expr *expr)
2064 sym = expr->symtree->n.sym;
2066 if (sym->attr.dummy)
2068 sym->attr.proc = PROC_DUMMY;
2069 expr->value.function.name = sym->name;
2073 /* See if we have an intrinsic function reference. */
2075 if (gfc_is_intrinsic (sym, 0, expr->where))
2077 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2082 /* The reference is to an external name. */
2084 sym->attr.proc = PROC_EXTERNAL;
2085 expr->value.function.name = sym->name;
2086 expr->value.function.esym = expr->symtree->n.sym;
2088 if (sym->as != NULL)
2089 expr->rank = sym->as->rank;
2091 /* Type of the expression is either the type of the symbol or the
2092 default type of the symbol. */
2095 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2097 if (sym->ts.type != BT_UNKNOWN)
2101 ts = gfc_get_default_type (sym->name, sym->ns);
2103 if (ts->type == BT_UNKNOWN)
2105 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2106 sym->name, &expr->where);
2117 /* Return true, if the symbol is an external procedure. */
2119 is_external_proc (gfc_symbol *sym)
2121 if (!sym->attr.dummy && !sym->attr.contained
2122 && !(sym->attr.intrinsic
2123 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2124 && sym->attr.proc != PROC_ST_FUNCTION
2125 && !sym->attr.use_assoc
2133 /* Figure out if a function reference is pure or not. Also set the name
2134 of the function for a potential error message. Return nonzero if the
2135 function is PURE, zero if not. */
2137 pure_stmt_function (gfc_expr *, gfc_symbol *);
2140 pure_function (gfc_expr *e, const char **name)
2146 if (e->symtree != NULL
2147 && e->symtree->n.sym != NULL
2148 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2149 return pure_stmt_function (e, e->symtree->n.sym);
2151 if (e->value.function.esym)
2153 pure = gfc_pure (e->value.function.esym);
2154 *name = e->value.function.esym->name;
2156 else if (e->value.function.isym)
2158 pure = e->value.function.isym->pure
2159 || e->value.function.isym->elemental;
2160 *name = e->value.function.isym->name;
2164 /* Implicit functions are not pure. */
2166 *name = e->value.function.name;
2174 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2175 int *f ATTRIBUTE_UNUSED)
2179 /* Don't bother recursing into other statement functions
2180 since they will be checked individually for purity. */
2181 if (e->expr_type != EXPR_FUNCTION
2183 || e->symtree->n.sym == sym
2184 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2187 return pure_function (e, &name) ? false : true;
2192 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2194 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2199 is_scalar_expr_ptr (gfc_expr *expr)
2201 gfc_try retval = SUCCESS;
2206 /* See if we have a gfc_ref, which means we have a substring, array
2207 reference, or a component. */
2208 if (expr->ref != NULL)
2211 while (ref->next != NULL)
2217 if (ref->u.ss.length != NULL
2218 && ref->u.ss.length->length != NULL
2220 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2222 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2224 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2225 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2226 if (end - start + 1 != 1)
2233 if (ref->u.ar.type == AR_ELEMENT)
2235 else if (ref->u.ar.type == AR_FULL)
2237 /* The user can give a full array if the array is of size 1. */
2238 if (ref->u.ar.as != NULL
2239 && ref->u.ar.as->rank == 1
2240 && ref->u.ar.as->type == AS_EXPLICIT
2241 && ref->u.ar.as->lower[0] != NULL
2242 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2243 && ref->u.ar.as->upper[0] != NULL
2244 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2246 /* If we have a character string, we need to check if
2247 its length is one. */
2248 if (expr->ts.type == BT_CHARACTER)
2250 if (expr->ts.u.cl == NULL
2251 || expr->ts.u.cl->length == NULL
2252 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2258 /* We have constant lower and upper bounds. If the
2259 difference between is 1, it can be considered a
2261 start = (int) mpz_get_si
2262 (ref->u.ar.as->lower[0]->value.integer);
2263 end = (int) mpz_get_si
2264 (ref->u.ar.as->upper[0]->value.integer);
2265 if (end - start + 1 != 1)
2280 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2282 /* Character string. Make sure it's of length 1. */
2283 if (expr->ts.u.cl == NULL
2284 || expr->ts.u.cl->length == NULL
2285 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2288 else if (expr->rank != 0)
2295 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2296 and, in the case of c_associated, set the binding label based on
2300 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2301 gfc_symbol **new_sym)
2303 char name[GFC_MAX_SYMBOL_LEN + 1];
2304 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2305 int optional_arg = 0, is_pointer = 0;
2306 gfc_try retval = SUCCESS;
2307 gfc_symbol *args_sym;
2308 gfc_typespec *arg_ts;
2310 if (args->expr->expr_type == EXPR_CONSTANT
2311 || args->expr->expr_type == EXPR_OP
2312 || args->expr->expr_type == EXPR_NULL)
2314 gfc_error ("Argument to '%s' at %L is not a variable",
2315 sym->name, &(args->expr->where));
2319 args_sym = args->expr->symtree->n.sym;
2321 /* The typespec for the actual arg should be that stored in the expr
2322 and not necessarily that of the expr symbol (args_sym), because
2323 the actual expression could be a part-ref of the expr symbol. */
2324 arg_ts = &(args->expr->ts);
2326 is_pointer = gfc_is_data_pointer (args->expr);
2328 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2330 /* If the user gave two args then they are providing something for
2331 the optional arg (the second cptr). Therefore, set the name and
2332 binding label to the c_associated for two cptrs. Otherwise,
2333 set c_associated to expect one cptr. */
2337 sprintf (name, "%s_2", sym->name);
2338 sprintf (binding_label, "%s_2", sym->binding_label);
2344 sprintf (name, "%s_1", sym->name);
2345 sprintf (binding_label, "%s_1", sym->binding_label);
2349 /* Get a new symbol for the version of c_associated that
2351 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2353 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2354 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2356 sprintf (name, "%s", sym->name);
2357 sprintf (binding_label, "%s", sym->binding_label);
2359 /* Error check the call. */
2360 if (args->next != NULL)
2362 gfc_error_now ("More actual than formal arguments in '%s' "
2363 "call at %L", name, &(args->expr->where));
2366 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2368 /* Make sure we have either the target or pointer attribute. */
2369 if (!args_sym->attr.target && !is_pointer)
2371 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2372 "a TARGET or an associated pointer",
2374 sym->name, &(args->expr->where));
2378 /* See if we have interoperable type and type param. */
2379 if (verify_c_interop (arg_ts) == SUCCESS
2380 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2382 if (args_sym->attr.target == 1)
2384 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2385 has the target attribute and is interoperable. */
2386 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2387 allocatable variable that has the TARGET attribute and
2388 is not an array of zero size. */
2389 if (args_sym->attr.allocatable == 1)
2391 if (args_sym->attr.dimension != 0
2392 && (args_sym->as && args_sym->as->rank == 0))
2394 gfc_error_now ("Allocatable variable '%s' used as a "
2395 "parameter to '%s' at %L must not be "
2396 "an array of zero size",
2397 args_sym->name, sym->name,
2398 &(args->expr->where));
2404 /* A non-allocatable target variable with C
2405 interoperable type and type parameters must be
2407 if (args_sym && args_sym->attr.dimension)
2409 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2411 gfc_error ("Assumed-shape array '%s' at %L "
2412 "cannot be an argument to the "
2413 "procedure '%s' because "
2414 "it is not C interoperable",
2416 &(args->expr->where), sym->name);
2419 else if (args_sym->as->type == AS_DEFERRED)
2421 gfc_error ("Deferred-shape array '%s' at %L "
2422 "cannot be an argument to the "
2423 "procedure '%s' because "
2424 "it is not C interoperable",
2426 &(args->expr->where), sym->name);
2431 /* Make sure it's not a character string. Arrays of
2432 any type should be ok if the variable is of a C
2433 interoperable type. */
2434 if (arg_ts->type == BT_CHARACTER)
2435 if (arg_ts->u.cl != NULL
2436 && (arg_ts->u.cl->length == NULL
2437 || arg_ts->u.cl->length->expr_type
2440 (arg_ts->u.cl->length->value.integer, 1)
2442 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2444 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2445 "at %L must have a length of 1",
2446 args_sym->name, sym->name,
2447 &(args->expr->where));
2453 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2455 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2457 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2458 "associated scalar POINTER", args_sym->name,
2459 sym->name, &(args->expr->where));
2465 /* The parameter is not required to be C interoperable. If it
2466 is not C interoperable, it must be a nonpolymorphic scalar
2467 with no length type parameters. It still must have either
2468 the pointer or target attribute, and it can be
2469 allocatable (but must be allocated when c_loc is called). */
2470 if (args->expr->rank != 0
2471 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2473 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2474 "scalar", args_sym->name, sym->name,
2475 &(args->expr->where));
2478 else if (arg_ts->type == BT_CHARACTER
2479 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2481 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2482 "%L must have a length of 1",
2483 args_sym->name, sym->name,
2484 &(args->expr->where));
2489 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2491 if (args_sym->attr.flavor != FL_PROCEDURE)
2493 /* TODO: Update this error message to allow for procedure
2494 pointers once they are implemented. */
2495 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2497 args_sym->name, sym->name,
2498 &(args->expr->where));
2501 else if (args_sym->attr.is_bind_c != 1)
2503 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2505 args_sym->name, sym->name,
2506 &(args->expr->where));
2511 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2516 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2517 "iso_c_binding function: '%s'!\n", sym->name);
2524 /* Resolve a function call, which means resolving the arguments, then figuring
2525 out which entity the name refers to. */
2526 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2527 to INTENT(OUT) or INTENT(INOUT). */
2530 resolve_function (gfc_expr *expr)
2532 gfc_actual_arglist *arg;
2537 procedure_type p = PROC_INTRINSIC;
2538 bool no_formal_args;
2542 sym = expr->symtree->n.sym;
2544 /* If this is a procedure pointer component, it has already been resolved. */
2545 if (gfc_is_proc_ptr_comp (expr, NULL))
2548 if (sym && sym->attr.intrinsic
2549 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2552 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2554 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2558 /* If this ia a deferred TBP with an abstract interface (which may
2559 of course be referenced), expr->value.function.esym will be set. */
2560 if (sym && sym->attr.abstract && !expr->value.function.esym)
2562 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2563 sym->name, &expr->where);
2567 /* Switch off assumed size checking and do this again for certain kinds
2568 of procedure, once the procedure itself is resolved. */
2569 need_full_assumed_size++;
2571 if (expr->symtree && expr->symtree->n.sym)
2572 p = expr->symtree->n.sym->attr.proc;
2574 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2575 if (resolve_actual_arglist (expr->value.function.actual,
2576 p, no_formal_args) == FAILURE)
2579 /* Need to setup the call to the correct c_associated, depending on
2580 the number of cptrs to user gives to compare. */
2581 if (sym && sym->attr.is_iso_c == 1)
2583 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2587 /* Get the symtree for the new symbol (resolved func).
2588 the old one will be freed later, when it's no longer used. */
2589 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2592 /* Resume assumed_size checking. */
2593 need_full_assumed_size--;
2595 /* If the procedure is external, check for usage. */
2596 if (sym && is_external_proc (sym))
2597 resolve_global_procedure (sym, &expr->where,
2598 &expr->value.function.actual, 0);
2600 if (sym && sym->ts.type == BT_CHARACTER
2602 && sym->ts.u.cl->length == NULL
2604 && expr->value.function.esym == NULL
2605 && !sym->attr.contained)
2607 /* Internal procedures are taken care of in resolve_contained_fntype. */
2608 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2609 "be used at %L since it is not a dummy argument",
2610 sym->name, &expr->where);
2614 /* See if function is already resolved. */
2616 if (expr->value.function.name != NULL)
2618 if (expr->ts.type == BT_UNKNOWN)
2624 /* Apply the rules of section 14.1.2. */
2626 switch (procedure_kind (sym))
2629 t = resolve_generic_f (expr);
2632 case PTYPE_SPECIFIC:
2633 t = resolve_specific_f (expr);
2637 t = resolve_unknown_f (expr);
2641 gfc_internal_error ("resolve_function(): bad function type");
2645 /* If the expression is still a function (it might have simplified),
2646 then we check to see if we are calling an elemental function. */
2648 if (expr->expr_type != EXPR_FUNCTION)
2651 temp = need_full_assumed_size;
2652 need_full_assumed_size = 0;
2654 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2657 if (omp_workshare_flag
2658 && expr->value.function.esym
2659 && ! gfc_elemental (expr->value.function.esym))
2661 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2662 "in WORKSHARE construct", expr->value.function.esym->name,
2667 #define GENERIC_ID expr->value.function.isym->id
2668 else if (expr->value.function.actual != NULL
2669 && expr->value.function.isym != NULL
2670 && GENERIC_ID != GFC_ISYM_LBOUND
2671 && GENERIC_ID != GFC_ISYM_LEN
2672 && GENERIC_ID != GFC_ISYM_LOC
2673 && GENERIC_ID != GFC_ISYM_PRESENT)
2675 /* Array intrinsics must also have the last upper bound of an
2676 assumed size array argument. UBOUND and SIZE have to be
2677 excluded from the check if the second argument is anything
2680 for (arg = expr->value.function.actual; arg; arg = arg->next)
2682 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2683 && arg->next != NULL && arg->next->expr)
2685 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2688 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2691 if ((int)mpz_get_si (arg->next->expr->value.integer)
2696 if (arg->expr != NULL
2697 && arg->expr->rank > 0
2698 && resolve_assumed_size_actual (arg->expr))
2704 need_full_assumed_size = temp;
2707 if (!pure_function (expr, &name) && name)
2711 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2712 "FORALL %s", name, &expr->where,
2713 forall_flag == 2 ? "mask" : "block");
2716 else if (gfc_pure (NULL))
2718 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2719 "procedure within a PURE procedure", name, &expr->where);
2724 /* Functions without the RECURSIVE attribution are not allowed to
2725 * call themselves. */
2726 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2729 esym = expr->value.function.esym;
2731 if (is_illegal_recursion (esym, gfc_current_ns))
2733 if (esym->attr.entry && esym->ns->entries)
2734 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2735 " function '%s' is not RECURSIVE",
2736 esym->name, &expr->where, esym->ns->entries->sym->name);
2738 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2739 " is not RECURSIVE", esym->name, &expr->where);
2745 /* Character lengths of use associated functions may contains references to
2746 symbols not referenced from the current program unit otherwise. Make sure
2747 those symbols are marked as referenced. */
2749 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2750 && expr->value.function.esym->attr.use_assoc)
2752 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
2756 && !((expr->value.function.esym
2757 && expr->value.function.esym->attr.elemental)
2759 (expr->value.function.isym
2760 && expr->value.function.isym->elemental)))
2761 find_noncopying_intrinsics (expr->value.function.esym,
2762 expr->value.function.actual);
2764 /* Make sure that the expression has a typespec that works. */
2765 if (expr->ts.type == BT_UNKNOWN)
2767 if (expr->symtree->n.sym->result
2768 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2769 && !expr->symtree->n.sym->result->attr.proc_pointer)
2770 expr->ts = expr->symtree->n.sym->result->ts;
2777 /************* Subroutine resolution *************/
2780 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2786 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2787 sym->name, &c->loc);
2788 else if (gfc_pure (NULL))
2789 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2795 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2799 if (sym->attr.generic)
2801 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2804 c->resolved_sym = s;
2805 pure_subroutine (c, s);
2809 /* TODO: Need to search for elemental references in generic interface. */
2812 if (sym->attr.intrinsic)
2813 return gfc_intrinsic_sub_interface (c, 0);
2820 resolve_generic_s (gfc_code *c)
2825 sym = c->symtree->n.sym;
2829 m = resolve_generic_s0 (c, sym);
2832 else if (m == MATCH_ERROR)
2836 if (sym->ns->parent == NULL)
2838 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2842 if (!generic_sym (sym))
2846 /* Last ditch attempt. See if the reference is to an intrinsic
2847 that possesses a matching interface. 14.1.2.4 */
2848 sym = c->symtree->n.sym;
2850 if (!gfc_is_intrinsic (sym, 1, c->loc))
2852 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2853 sym->name, &c->loc);
2857 m = gfc_intrinsic_sub_interface (c, 0);
2861 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2862 "intrinsic subroutine interface", sym->name, &c->loc);
2868 /* Set the name and binding label of the subroutine symbol in the call
2869 expression represented by 'c' to include the type and kind of the
2870 second parameter. This function is for resolving the appropriate
2871 version of c_f_pointer() and c_f_procpointer(). For example, a
2872 call to c_f_pointer() for a default integer pointer could have a
2873 name of c_f_pointer_i4. If no second arg exists, which is an error
2874 for these two functions, it defaults to the generic symbol's name
2875 and binding label. */
2878 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2879 char *name, char *binding_label)
2881 gfc_expr *arg = NULL;
2885 /* The second arg of c_f_pointer and c_f_procpointer determines
2886 the type and kind for the procedure name. */
2887 arg = c->ext.actual->next->expr;
2891 /* Set up the name to have the given symbol's name,
2892 plus the type and kind. */
2893 /* a derived type is marked with the type letter 'u' */
2894 if (arg->ts.type == BT_DERIVED)
2897 kind = 0; /* set the kind as 0 for now */
2901 type = gfc_type_letter (arg->ts.type);
2902 kind = arg->ts.kind;
2905 if (arg->ts.type == BT_CHARACTER)
2906 /* Kind info for character strings not needed. */
2909 sprintf (name, "%s_%c%d", sym->name, type, kind);
2910 /* Set up the binding label as the given symbol's label plus
2911 the type and kind. */
2912 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2916 /* If the second arg is missing, set the name and label as
2917 was, cause it should at least be found, and the missing
2918 arg error will be caught by compare_parameters(). */
2919 sprintf (name, "%s", sym->name);
2920 sprintf (binding_label, "%s", sym->binding_label);
2927 /* Resolve a generic version of the iso_c_binding procedure given
2928 (sym) to the specific one based on the type and kind of the
2929 argument(s). Currently, this function resolves c_f_pointer() and
2930 c_f_procpointer based on the type and kind of the second argument
2931 (FPTR). Other iso_c_binding procedures aren't specially handled.
2932 Upon successfully exiting, c->resolved_sym will hold the resolved
2933 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2937 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2939 gfc_symbol *new_sym;
2940 /* this is fine, since we know the names won't use the max */
2941 char name[GFC_MAX_SYMBOL_LEN + 1];
2942 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2943 /* default to success; will override if find error */
2944 match m = MATCH_YES;
2946 /* Make sure the actual arguments are in the necessary order (based on the
2947 formal args) before resolving. */
2948 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2950 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2951 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2953 set_name_and_label (c, sym, name, binding_label);
2955 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2957 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
2959 /* Make sure we got a third arg if the second arg has non-zero
2960 rank. We must also check that the type and rank are
2961 correct since we short-circuit this check in
2962 gfc_procedure_use() (called above to sort actual args). */
2963 if (c->ext.actual->next->expr->rank != 0)
2965 if(c->ext.actual->next->next == NULL
2966 || c->ext.actual->next->next->expr == NULL)
2969 gfc_error ("Missing SHAPE parameter for call to %s "
2970 "at %L", sym->name, &(c->loc));
2972 else if (c->ext.actual->next->next->expr->ts.type
2974 || c->ext.actual->next->next->expr->rank != 1)
2977 gfc_error ("SHAPE parameter for call to %s at %L must "
2978 "be a rank 1 INTEGER array", sym->name,
2985 if (m != MATCH_ERROR)
2987 /* the 1 means to add the optional arg to formal list */
2988 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
2990 /* for error reporting, say it's declared where the original was */
2991 new_sym->declared_at = sym->declared_at;
2996 /* no differences for c_loc or c_funloc */
3000 /* set the resolved symbol */
3001 if (m != MATCH_ERROR)
3002 c->resolved_sym = new_sym;
3004 c->resolved_sym = sym;
3010 /* Resolve a subroutine call known to be specific. */
3013 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3017 if(sym->attr.is_iso_c)
3019 m = gfc_iso_c_sub_interface (c,sym);
3023 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3025 if (sym->attr.dummy)
3027 sym->attr.proc = PROC_DUMMY;
3031 sym->attr.proc = PROC_EXTERNAL;
3035 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3038 if (sym->attr.intrinsic)
3040 m = gfc_intrinsic_sub_interface (c, 1);
3044 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3045 "with an intrinsic", sym->name, &c->loc);
3053 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3055 c->resolved_sym = sym;
3056 pure_subroutine (c, sym);
3063 resolve_specific_s (gfc_code *c)
3068 sym = c->symtree->n.sym;
3072 m = resolve_specific_s0 (c, sym);
3075 if (m == MATCH_ERROR)
3078 if (sym->ns->parent == NULL)
3081 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3087 sym = c->symtree->n.sym;
3088 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3089 sym->name, &c->loc);
3095 /* Resolve a subroutine call not known to be generic nor specific. */
3098 resolve_unknown_s (gfc_code *c)
3102 sym = c->symtree->n.sym;
3104 if (sym->attr.dummy)
3106 sym->attr.proc = PROC_DUMMY;
3110 /* See if we have an intrinsic function reference. */
3112 if (gfc_is_intrinsic (sym, 1, c->loc))
3114 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3119 /* The reference is to an external name. */
3122 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3124 c->resolved_sym = sym;
3126 pure_subroutine (c, sym);
3132 /* Resolve a subroutine call. Although it was tempting to use the same code
3133 for functions, subroutines and functions are stored differently and this
3134 makes things awkward. */
3137 resolve_call (gfc_code *c)
3140 procedure_type ptype = PROC_INTRINSIC;
3141 gfc_symbol *csym, *sym;
3142 bool no_formal_args;
3144 csym = c->symtree ? c->symtree->n.sym : NULL;
3146 if (csym && csym->ts.type != BT_UNKNOWN)
3148 gfc_error ("'%s' at %L has a type, which is not consistent with "
3149 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3153 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3156 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3157 sym = st ? st->n.sym : NULL;
3158 if (sym && csym != sym
3159 && sym->ns == gfc_current_ns
3160 && sym->attr.flavor == FL_PROCEDURE
3161 && sym->attr.contained)
3164 if (csym->attr.generic)
3165 c->symtree->n.sym = sym;
3168 csym = c->symtree->n.sym;
3172 /* If this ia a deferred TBP with an abstract interface
3173 (which may of course be referenced), c->expr1 will be set. */
3174 if (csym && csym->attr.abstract && !c->expr1)
3176 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3177 csym->name, &c->loc);
3181 /* Subroutines without the RECURSIVE attribution are not allowed to
3182 * call themselves. */
3183 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3185 if (csym->attr.entry && csym->ns->entries)
3186 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3187 " subroutine '%s' is not RECURSIVE",
3188 csym->name, &c->loc, csym->ns->entries->sym->name);
3190 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3191 " is not RECURSIVE", csym->name, &c->loc);
3196 /* Switch off assumed size checking and do this again for certain kinds
3197 of procedure, once the procedure itself is resolved. */
3198 need_full_assumed_size++;
3201 ptype = csym->attr.proc;
3203 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3204 if (resolve_actual_arglist (c->ext.actual, ptype,
3205 no_formal_args) == FAILURE)
3208 /* Resume assumed_size checking. */
3209 need_full_assumed_size--;
3211 /* If external, check for usage. */
3212 if (csym && is_external_proc (csym))
3213 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3216 if (c->resolved_sym == NULL)
3218 c->resolved_isym = NULL;
3219 switch (procedure_kind (csym))
3222 t = resolve_generic_s (c);
3225 case PTYPE_SPECIFIC:
3226 t = resolve_specific_s (c);
3230 t = resolve_unknown_s (c);
3234 gfc_internal_error ("resolve_subroutine(): bad function type");
3238 /* Some checks of elemental subroutine actual arguments. */
3239 if (resolve_elemental_actual (NULL, c) == FAILURE)
3242 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3243 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3248 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3249 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3250 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3251 if their shapes do not match. If either op1->shape or op2->shape is
3252 NULL, return SUCCESS. */
3255 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3262 if (op1->shape != NULL && op2->shape != NULL)
3264 for (i = 0; i < op1->rank; i++)
3266 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3268 gfc_error ("Shapes for operands at %L and %L are not conformable",
3269 &op1->where, &op2->where);
3280 /* Resolve an operator expression node. This can involve replacing the
3281 operation with a user defined function call. */
3284 resolve_operator (gfc_expr *e)
3286 gfc_expr *op1, *op2;
3288 bool dual_locus_error;
3291 /* Resolve all subnodes-- give them types. */
3293 switch (e->value.op.op)
3296 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3299 /* Fall through... */
3302 case INTRINSIC_UPLUS:
3303 case INTRINSIC_UMINUS:
3304 case INTRINSIC_PARENTHESES:
3305 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3310 /* Typecheck the new node. */
3312 op1 = e->value.op.op1;
3313 op2 = e->value.op.op2;
3314 dual_locus_error = false;
3316 if ((op1 && op1->expr_type == EXPR_NULL)
3317 || (op2 && op2->expr_type == EXPR_NULL))
3319 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3323 switch (e->value.op.op)
3325 case INTRINSIC_UPLUS:
3326 case INTRINSIC_UMINUS:
3327 if (op1->ts.type == BT_INTEGER
3328 || op1->ts.type == BT_REAL
3329 || op1->ts.type == BT_COMPLEX)
3335 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3336 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3339 case INTRINSIC_PLUS:
3340 case INTRINSIC_MINUS:
3341 case INTRINSIC_TIMES:
3342 case INTRINSIC_DIVIDE:
3343 case INTRINSIC_POWER:
3344 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3346 gfc_type_convert_binary (e, 1);
3351 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3352 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3353 gfc_typename (&op2->ts));
3356 case INTRINSIC_CONCAT:
3357 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3358 && op1->ts.kind == op2->ts.kind)
3360 e->ts.type = BT_CHARACTER;
3361 e->ts.kind = op1->ts.kind;
3366 _("Operands of string concatenation operator at %%L are %s/%s"),
3367 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3373 case INTRINSIC_NEQV:
3374 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3376 e->ts.type = BT_LOGICAL;
3377 e->ts.kind = gfc_kind_max (op1, op2);
3378 if (op1->ts.kind < e->ts.kind)
3379 gfc_convert_type (op1, &e->ts, 2);
3380 else if (op2->ts.kind < e->ts.kind)
3381 gfc_convert_type (op2, &e->ts, 2);
3385 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3386 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3387 gfc_typename (&op2->ts));
3392 if (op1->ts.type == BT_LOGICAL)
3394 e->ts.type = BT_LOGICAL;
3395 e->ts.kind = op1->ts.kind;
3399 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3400 gfc_typename (&op1->ts));
3404 case INTRINSIC_GT_OS:
3406 case INTRINSIC_GE_OS:
3408 case INTRINSIC_LT_OS:
3410 case INTRINSIC_LE_OS:
3411 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3413 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3417 /* Fall through... */
3420 case INTRINSIC_EQ_OS:
3422 case INTRINSIC_NE_OS:
3423 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3424 && op1->ts.kind == op2->ts.kind)
3426 e->ts.type = BT_LOGICAL;
3427 e->ts.kind = gfc_default_logical_kind;
3431 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3433 gfc_type_convert_binary (e, 1);
3435 e->ts.type = BT_LOGICAL;
3436 e->ts.kind = gfc_default_logical_kind;
3440 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3442 _("Logicals at %%L must be compared with %s instead of %s"),
3443 (e->value.op.op == INTRINSIC_EQ
3444 || e->value.op.op == INTRINSIC_EQ_OS)
3445 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3448 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3449 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3450 gfc_typename (&op2->ts));
3454 case INTRINSIC_USER:
3455 if (e->value.op.uop->op == NULL)
3456 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3457 else if (op2 == NULL)
3458 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3459 e->value.op.uop->name, gfc_typename (&op1->ts));
3461 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3462 e->value.op.uop->name, gfc_typename (&op1->ts),
3463 gfc_typename (&op2->ts));
3467 case INTRINSIC_PARENTHESES:
3469 if (e->ts.type == BT_CHARACTER)
3470 e->ts.u.cl = op1->ts.u.cl;
3474 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3477 /* Deal with arrayness of an operand through an operator. */
3481 switch (e->value.op.op)
3483 case INTRINSIC_PLUS:
3484 case INTRINSIC_MINUS:
3485 case INTRINSIC_TIMES:
3486 case INTRINSIC_DIVIDE:
3487 case INTRINSIC_POWER:
3488 case INTRINSIC_CONCAT:
3492 case INTRINSIC_NEQV:
3494 case INTRINSIC_EQ_OS:
3496 case INTRINSIC_NE_OS:
3498 case INTRINSIC_GT_OS:
3500 case INTRINSIC_GE_OS:
3502 case INTRINSIC_LT_OS:
3504 case INTRINSIC_LE_OS:
3506 if (op1->rank == 0 && op2->rank == 0)
3509 if (op1->rank == 0 && op2->rank != 0)
3511 e->rank = op2->rank;
3513 if (e->shape == NULL)
3514 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3517 if (op1->rank != 0 && op2->rank == 0)
3519 e->rank = op1->rank;
3521 if (e->shape == NULL)
3522 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3525 if (op1->rank != 0 && op2->rank != 0)
3527 if (op1->rank == op2->rank)
3529 e->rank = op1->rank;
3530 if (e->shape == NULL)
3532 t = compare_shapes(op1, op2);
3536 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3541 /* Allow higher level expressions to work. */
3544 /* Try user-defined operators, and otherwise throw an error. */
3545 dual_locus_error = true;
3547 _("Inconsistent ranks for operator at %%L and %%L"));
3554 case INTRINSIC_PARENTHESES:
3556 case INTRINSIC_UPLUS:
3557 case INTRINSIC_UMINUS:
3558 /* Simply copy arrayness attribute */
3559 e->rank = op1->rank;
3561 if (e->shape == NULL)
3562 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3570 /* Attempt to simplify the expression. */
3573 t = gfc_simplify_expr (e, 0);
3574 /* Some calls do not succeed in simplification and return FAILURE
3575 even though there is no error; e.g. variable references to
3576 PARAMETER arrays. */
3577 if (!gfc_is_constant_expr (e))
3586 if (gfc_extend_expr (e, &real_error) == SUCCESS)
3593 if (dual_locus_error)
3594 gfc_error (msg, &op1->where, &op2->where);
3596 gfc_error (msg, &e->where);
3602 /************** Array resolution subroutines **************/
3605 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3608 /* Compare two integer expressions. */
3611 compare_bound (gfc_expr *a, gfc_expr *b)
3615 if (a == NULL || a->expr_type != EXPR_CONSTANT
3616 || b == NULL || b->expr_type != EXPR_CONSTANT)
3619 /* If either of the types isn't INTEGER, we must have
3620 raised an error earlier. */
3622 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3625 i = mpz_cmp (a->value.integer, b->value.integer);
3635 /* Compare an integer expression with an integer. */
3638 compare_bound_int (gfc_expr *a, int b)
3642 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3645 if (a->ts.type != BT_INTEGER)
3646 gfc_internal_error ("compare_bound_int(): Bad expression");
3648 i = mpz_cmp_si (a->value.integer, b);
3658 /* Compare an integer expression with a mpz_t. */
3661 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3665 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3668 if (a->ts.type != BT_INTEGER)
3669 gfc_internal_error ("compare_bound_int(): Bad expression");
3671 i = mpz_cmp (a->value.integer, b);
3681 /* Compute the last value of a sequence given by a triplet.
3682 Return 0 if it wasn't able to compute the last value, or if the
3683 sequence if empty, and 1 otherwise. */
3686 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3687 gfc_expr *stride, mpz_t last)
3691 if (start == NULL || start->expr_type != EXPR_CONSTANT
3692 || end == NULL || end->expr_type != EXPR_CONSTANT
3693 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3696 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3697 || (stride != NULL && stride->ts.type != BT_INTEGER))
3700 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3702 if (compare_bound (start, end) == CMP_GT)
3704 mpz_set (last, end->value.integer);
3708 if (compare_bound_int (stride, 0) == CMP_GT)
3710 /* Stride is positive */
3711 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3716 /* Stride is negative */
3717 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3722 mpz_sub (rem, end->value.integer, start->value.integer);
3723 mpz_tdiv_r (rem, rem, stride->value.integer);
3724 mpz_sub (last, end->value.integer, rem);
3731 /* Compare a single dimension of an array reference to the array
3735 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3739 /* Given start, end and stride values, calculate the minimum and
3740 maximum referenced indexes. */
3742 switch (ar->dimen_type[i])
3748 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3750 gfc_warning ("Array reference at %L is out of bounds "
3751 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3752 mpz_get_si (ar->start[i]->value.integer),
3753 mpz_get_si (as->lower[i]->value.integer), i+1);
3756 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3758 gfc_warning ("Array reference at %L is out of bounds "
3759 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3760 mpz_get_si (ar->start[i]->value.integer),
3761 mpz_get_si (as->upper[i]->value.integer), i+1);
3769 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3770 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3772 comparison comp_start_end = compare_bound (AR_START, AR_END);
3774 /* Check for zero stride, which is not allowed. */
3775 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3777 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3781 /* if start == len || (stride > 0 && start < len)
3782 || (stride < 0 && start > len),
3783 then the array section contains at least one element. In this
3784 case, there is an out-of-bounds access if
3785 (start < lower || start > upper). */
3786 if (compare_bound (AR_START, AR_END) == CMP_EQ
3787 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3788 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3789 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3790 && comp_start_end == CMP_GT))
3792 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3794 gfc_warning ("Lower array reference at %L is out of bounds "
3795 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3796 mpz_get_si (AR_START->value.integer),
3797 mpz_get_si (as->lower[i]->value.integer), i+1);
3800 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3802 gfc_warning ("Lower array reference at %L is out of bounds "
3803 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3804 mpz_get_si (AR_START->value.integer),
3805 mpz_get_si (as->upper[i]->value.integer), i+1);
3810 /* If we can compute the highest index of the array section,
3811 then it also has to be between lower and upper. */
3812 mpz_init (last_value);
3813 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3816 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3818 gfc_warning ("Upper array reference at %L is out of bounds "
3819 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3820 mpz_get_si (last_value),
3821 mpz_get_si (as->lower[i]->value.integer), i+1);
3822 mpz_clear (last_value);
3825 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3827 gfc_warning ("Upper array reference at %L is out of bounds "
3828 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3829 mpz_get_si (last_value),
3830 mpz_get_si (as->upper[i]->value.integer), i+1);
3831 mpz_clear (last_value);
3835 mpz_clear (last_value);
3843 gfc_internal_error ("check_dimension(): Bad array reference");
3850 /* Compare an array reference with an array specification. */
3853 compare_spec_to_ref (gfc_array_ref *ar)
3860 /* TODO: Full array sections are only allowed as actual parameters. */
3861 if (as->type == AS_ASSUMED_SIZE
3862 && (/*ar->type == AR_FULL
3863 ||*/ (ar->type == AR_SECTION
3864 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3866 gfc_error ("Rightmost upper bound of assumed size array section "
3867 "not specified at %L", &ar->where);
3871 if (ar->type == AR_FULL)
3874 if (as->rank != ar->dimen)
3876 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3877 &ar->where, ar->dimen, as->rank);
3881 for (i = 0; i < as->rank; i++)
3882 if (check_dimension (i, ar, as) == FAILURE)
3889 /* Resolve one part of an array index. */
3892 gfc_resolve_index (gfc_expr *index, int check_scalar)
3899 if (gfc_resolve_expr (index) == FAILURE)
3902 if (check_scalar && index->rank != 0)
3904 gfc_error ("Array index at %L must be scalar", &index->where);
3908 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
3910 gfc_error ("Array index at %L must be of INTEGER type, found %s",
3911 &index->where, gfc_basic_typename (index->ts.type));
3915 if (index->ts.type == BT_REAL)
3916 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
3917 &index->where) == FAILURE)
3920 if (index->ts.kind != gfc_index_integer_kind
3921 || index->ts.type != BT_INTEGER)
3924 ts.type = BT_INTEGER;
3925 ts.kind = gfc_index_integer_kind;
3927 gfc_convert_type_warn (index, &ts, 2, 0);
3933 /* Resolve a dim argument to an intrinsic function. */
3936 gfc_resolve_dim_arg (gfc_expr *dim)
3941 if (gfc_resolve_expr (dim) == FAILURE)
3946 gfc_error ("Argument dim at %L must be scalar", &dim->where);
3951 if (dim->ts.type != BT_INTEGER)
3953 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
3957 if (dim->ts.kind != gfc_index_integer_kind)
3962 ts.type = BT_INTEGER;
3963 ts.kind = gfc_index_integer_kind;
3965 gfc_convert_type_warn (dim, &ts, 2, 0);
3971 /* Given an expression that contains array references, update those array
3972 references to point to the right array specifications. While this is
3973 filled in during matching, this information is difficult to save and load
3974 in a module, so we take care of it here.
3976 The idea here is that the original array reference comes from the
3977 base symbol. We traverse the list of reference structures, setting
3978 the stored reference to references. Component references can
3979 provide an additional array specification. */
3982 find_array_spec (gfc_expr *e)
3986 gfc_symbol *derived;
3989 if (e->symtree->n.sym->ts.type == BT_CLASS)
3990 as = e->symtree->n.sym->ts.u.derived->components->as;
3992 as = e->symtree->n.sym->as;
3995 for (ref = e->ref; ref; ref = ref->next)
4000 gfc_internal_error ("find_array_spec(): Missing spec");
4007 if (derived == NULL)
4008 derived = e->symtree->n.sym->ts.u.derived;
4010 if (derived->attr.is_class)
4011 derived = derived->components->ts.u.derived;
4013 c = derived->components;
4015 for (; c; c = c->next)
4016 if (c == ref->u.c.component)
4018 /* Track the sequence of component references. */
4019 if (c->ts.type == BT_DERIVED)
4020 derived = c->ts.u.derived;
4025 gfc_internal_error ("find_array_spec(): Component not found");
4027 if (c->attr.dimension)
4030 gfc_internal_error ("find_array_spec(): unused as(1)");
4041 gfc_internal_error ("find_array_spec(): unused as(2)");
4045 /* Resolve an array reference. */
4048 resolve_array_ref (gfc_array_ref *ar)
4050 int i, check_scalar;
4053 for (i = 0; i < ar->dimen; i++)
4055 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4057 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
4059 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4061 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4066 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4070 ar->dimen_type[i] = DIMEN_ELEMENT;
4074 ar->dimen_type[i] = DIMEN_VECTOR;
4075 if (e->expr_type == EXPR_VARIABLE
4076 && e->symtree->n.sym->ts.type == BT_DERIVED)
4077 ar->start[i] = gfc_get_parentheses (e);
4081 gfc_error ("Array index at %L is an array of rank %d",
4082 &ar->c_where[i], e->rank);
4087 /* If the reference type is unknown, figure out what kind it is. */
4089 if (ar->type == AR_UNKNOWN)
4091 ar->type = AR_ELEMENT;
4092 for (i = 0; i < ar->dimen; i++)
4093 if (ar->dimen_type[i] == DIMEN_RANGE
4094 || ar->dimen_type[i] == DIMEN_VECTOR)
4096 ar->type = AR_SECTION;
4101 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4109 resolve_substring (gfc_ref *ref)
4111 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4113 if (ref->u.ss.start != NULL)
4115 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4118 if (ref->u.ss.start->ts.type != BT_INTEGER)
4120 gfc_error ("Substring start index at %L must be of type INTEGER",
4121 &ref->u.ss.start->where);
4125 if (ref->u.ss.start->rank != 0)
4127 gfc_error ("Substring start index at %L must be scalar",
4128 &ref->u.ss.start->where);
4132 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4133 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4134 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4136 gfc_error ("Substring start index at %L is less than one",
4137 &ref->u.ss.start->where);
4142 if (ref->u.ss.end != NULL)
4144 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4147 if (ref->u.ss.end->ts.type != BT_INTEGER)
4149 gfc_error ("Substring end index at %L must be of type INTEGER",
4150 &ref->u.ss.end->where);
4154 if (ref->u.ss.end->rank != 0)
4156 gfc_error ("Substring end index at %L must be scalar",
4157 &ref->u.ss.end->where);
4161 if (ref->u.ss.length != NULL
4162 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4163 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4164 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4166 gfc_error ("Substring end index at %L exceeds the string length",
4167 &ref->u.ss.start->where);
4171 if (compare_bound_mpz_t (ref->u.ss.end,
4172 gfc_integer_kinds[k].huge) == CMP_GT
4173 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4174 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4176 gfc_error ("Substring end index at %L is too large",
4177 &ref->u.ss.end->where);
4186 /* This function supplies missing substring charlens. */
4189 gfc_resolve_substring_charlen (gfc_expr *e)
4192 gfc_expr *start, *end;
4194 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4195 if (char_ref->type == REF_SUBSTRING)
4201 gcc_assert (char_ref->next == NULL);
4205 if (e->ts.u.cl->length)
4206 gfc_free_expr (e->ts.u.cl->length);
4207 else if (e->expr_type == EXPR_VARIABLE
4208 && e->symtree->n.sym->attr.dummy)
4212 e->ts.type = BT_CHARACTER;
4213 e->ts.kind = gfc_default_character_kind;
4216 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4218 if (char_ref->u.ss.start)
4219 start = gfc_copy_expr (char_ref->u.ss.start);
4221 start = gfc_int_expr (1);
4223 if (char_ref->u.ss.end)
4224 end = gfc_copy_expr (char_ref->u.ss.end);
4225 else if (e->expr_type == EXPR_VARIABLE)
4226 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4233 /* Length = (end - start +1). */
4234 e->ts.u.cl->length = gfc_subtract (end, start);
4235 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length, gfc_int_expr (1));
4237 e->ts.u.cl->length->ts.type = BT_INTEGER;
4238 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4240 /* Make sure that the length is simplified. */
4241 gfc_simplify_expr (e->ts.u.cl->length, 1);
4242 gfc_resolve_expr (e->ts.u.cl->length);
4246 /* Resolve subtype references. */
4249 resolve_ref (gfc_expr *expr)
4251 int current_part_dimension, n_components, seen_part_dimension;
4254 for (ref = expr->ref; ref; ref = ref->next)
4255 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4257 find_array_spec (expr);
4261 for (ref = expr->ref; ref; ref = ref->next)
4265 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4273 resolve_substring (ref);
4277 /* Check constraints on part references. */
4279 current_part_dimension = 0;
4280 seen_part_dimension = 0;
4283 for (ref = expr->ref; ref; ref = ref->next)
4288 switch (ref->u.ar.type)
4292 current_part_dimension = 1;
4296 current_part_dimension = 0;
4300 gfc_internal_error ("resolve_ref(): Bad array reference");
4306 if (current_part_dimension || seen_part_dimension)
4309 if (ref->u.c.component->attr.pointer
4310 || ref->u.c.component->attr.proc_pointer)
4312 gfc_error ("Component to the right of a part reference "
4313 "with nonzero rank must not have the POINTER "
4314 "attribute at %L", &expr->where);
4317 else if (ref->u.c.component->attr.allocatable)
4319 gfc_error ("Component to the right of a part reference "
4320 "with nonzero rank must not have the ALLOCATABLE "
4321 "attribute at %L", &expr->where);
4333 if (((ref->type == REF_COMPONENT && n_components > 1)
4334 || ref->next == NULL)
4335 && current_part_dimension
4336 && seen_part_dimension)
4338 gfc_error ("Two or more part references with nonzero rank must "
4339 "not be specified at %L", &expr->where);
4343 if (ref->type == REF_COMPONENT)
4345 if (current_part_dimension)
4346 seen_part_dimension = 1;
4348 /* reset to make sure */
4349 current_part_dimension = 0;
4357 /* Given an expression, determine its shape. This is easier than it sounds.
4358 Leaves the shape array NULL if it is not possible to determine the shape. */
4361 expression_shape (gfc_expr *e)
4363 mpz_t array[GFC_MAX_DIMENSIONS];
4366 if (e->rank == 0 || e->shape != NULL)
4369 for (i = 0; i < e->rank; i++)
4370 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4373 e->shape = gfc_get_shape (e->rank);
4375 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4380 for (i--; i >= 0; i--)
4381 mpz_clear (array[i]);
4385 /* Given a variable expression node, compute the rank of the expression by
4386 examining the base symbol and any reference structures it may have. */
4389 expression_rank (gfc_expr *e)
4394 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4395 could lead to serious confusion... */
4396 gcc_assert (e->expr_type != EXPR_COMPCALL);
4400 if (e->expr_type == EXPR_ARRAY)
4402 /* Constructors can have a rank different from one via RESHAPE(). */
4404 if (e->symtree == NULL)
4410 e->rank = (e->symtree->n.sym->as == NULL)
4411 ? 0 : e->symtree->n.sym->as->rank;
4417 for (ref = e->ref; ref; ref = ref->next)
4419 if (ref->type != REF_ARRAY)
4422 if (ref->u.ar.type == AR_FULL)
4424 rank = ref->u.ar.as->rank;
4428 if (ref->u.ar.type == AR_SECTION)
4430 /* Figure out the rank of the section. */
4432 gfc_internal_error ("expression_rank(): Two array specs");
4434 for (i = 0; i < ref->u.ar.dimen; i++)
4435 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4436 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4446 expression_shape (e);
4450 /* Resolve a variable expression. */
4453 resolve_variable (gfc_expr *e)
4460 if (e->symtree == NULL)
4463 if (e->ref && resolve_ref (e) == FAILURE)
4466 sym = e->symtree->n.sym;
4467 if (sym->attr.flavor == FL_PROCEDURE
4468 && (!sym->attr.function
4469 || (sym->attr.function && sym->result
4470 && sym->result->attr.proc_pointer
4471 && !sym->result->attr.function)))
4473 e->ts.type = BT_PROCEDURE;
4474 goto resolve_procedure;
4477 if (sym->ts.type != BT_UNKNOWN)
4478 gfc_variable_attr (e, &e->ts);
4481 /* Must be a simple variable reference. */
4482 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4487 if (check_assumed_size_reference (sym, e))
4490 /* Deal with forward references to entries during resolve_code, to
4491 satisfy, at least partially, 12.5.2.5. */
4492 if (gfc_current_ns->entries
4493 && current_entry_id == sym->entry_id
4496 && cs_base->current->op != EXEC_ENTRY)
4498 gfc_entry_list *entry;
4499 gfc_formal_arglist *formal;
4503 /* If the symbol is a dummy... */
4504 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4506 entry = gfc_current_ns->entries;
4509 /* ...test if the symbol is a parameter of previous entries. */
4510 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4511 for (formal = entry->sym->formal; formal; formal = formal->next)
4513 if (formal->sym && sym->name == formal->sym->name)
4517 /* If it has not been seen as a dummy, this is an error. */
4520 if (specification_expr)
4521 gfc_error ("Variable '%s', used in a specification expression"
4522 ", is referenced at %L before the ENTRY statement "
4523 "in which it is a parameter",
4524 sym->name, &cs_base->current->loc);
4526 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4527 "statement in which it is a parameter",
4528 sym->name, &cs_base->current->loc);
4533 /* Now do the same check on the specification expressions. */
4534 specification_expr = 1;
4535 if (sym->ts.type == BT_CHARACTER
4536 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4540 for (n = 0; n < sym->as->rank; n++)
4542 specification_expr = 1;
4543 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4545 specification_expr = 1;
4546 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4549 specification_expr = 0;
4552 /* Update the symbol's entry level. */
4553 sym->entry_id = current_entry_id + 1;
4557 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4564 /* Checks to see that the correct symbol has been host associated.
4565 The only situation where this arises is that in which a twice
4566 contained function is parsed after the host association is made.
4567 Therefore, on detecting this, change the symbol in the expression
4568 and convert the array reference into an actual arglist if the old
4569 symbol is a variable. */
4571 check_host_association (gfc_expr *e)
4573 gfc_symbol *sym, *old_sym;
4577 gfc_actual_arglist *arg, *tail = NULL;
4578 bool retval = e->expr_type == EXPR_FUNCTION;
4580 /* If the expression is the result of substitution in
4581 interface.c(gfc_extend_expr) because there is no way in
4582 which the host association can be wrong. */
4583 if (e->symtree == NULL
4584 || e->symtree->n.sym == NULL
4585 || e->user_operator)
4588 old_sym = e->symtree->n.sym;
4590 if (gfc_current_ns->parent
4591 && old_sym->ns != gfc_current_ns)
4593 /* Use the 'USE' name so that renamed module symbols are
4594 correctly handled. */
4595 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4597 if (sym && old_sym != sym
4598 && sym->ts.type == old_sym->ts.type
4599 && sym->attr.flavor == FL_PROCEDURE
4600 && sym->attr.contained)
4602 /* Clear the shape, since it might not be valid. */
4603 if (e->shape != NULL)
4605 for (n = 0; n < e->rank; n++)
4606 mpz_clear (e->shape[n]);
4608 gfc_free (e->shape);
4611 /* Give the expression the right symtree! */
4612 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4613 gcc_assert (st != NULL);
4615 if (old_sym->attr.flavor == FL_PROCEDURE
4616 || e->expr_type == EXPR_FUNCTION)
4618 /* Original was function so point to the new symbol, since
4619 the actual argument list is already attached to the
4621 e->value.function.esym = NULL;
4626 /* Original was variable so convert array references into
4627 an actual arglist. This does not need any checking now
4628 since gfc_resolve_function will take care of it. */
4629 e->value.function.actual = NULL;
4630 e->expr_type = EXPR_FUNCTION;
4633 /* Ambiguity will not arise if the array reference is not
4634 the last reference. */
4635 for (ref = e->ref; ref; ref = ref->next)
4636 if (ref->type == REF_ARRAY && ref->next == NULL)
4639 gcc_assert (ref->type == REF_ARRAY);
4641 /* Grab the start expressions from the array ref and
4642 copy them into actual arguments. */
4643 for (n = 0; n < ref->u.ar.dimen; n++)
4645 arg = gfc_get_actual_arglist ();
4646 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4647 if (e->value.function.actual == NULL)
4648 tail = e->value.function.actual = arg;
4656 /* Dump the reference list and set the rank. */
4657 gfc_free_ref_list (e->ref);
4659 e->rank = sym->as ? sym->as->rank : 0;
4662 gfc_resolve_expr (e);
4666 /* This might have changed! */
4667 return e->expr_type == EXPR_FUNCTION;
4672 gfc_resolve_character_operator (gfc_expr *e)
4674 gfc_expr *op1 = e->value.op.op1;
4675 gfc_expr *op2 = e->value.op.op2;
4676 gfc_expr *e1 = NULL;
4677 gfc_expr *e2 = NULL;
4679 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4681 if (op1->ts.u.cl && op1->ts.u.cl->length)
4682 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4683 else if (op1->expr_type == EXPR_CONSTANT)
4684 e1 = gfc_int_expr (op1->value.character.length);
4686 if (op2->ts.u.cl && op2->ts.u.cl->length)
4687 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4688 else if (op2->expr_type == EXPR_CONSTANT)
4689 e2 = gfc_int_expr (op2->value.character.length);
4691 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4696 e->ts.u.cl->length = gfc_add (e1, e2);
4697 e->ts.u.cl->length->ts.type = BT_INTEGER;
4698 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4699 gfc_simplify_expr (e->ts.u.cl->length, 0);
4700 gfc_resolve_expr (e->ts.u.cl->length);
4706 /* Ensure that an character expression has a charlen and, if possible, a
4707 length expression. */
4710 fixup_charlen (gfc_expr *e)
4712 /* The cases fall through so that changes in expression type and the need
4713 for multiple fixes are picked up. In all circumstances, a charlen should
4714 be available for the middle end to hang a backend_decl on. */
4715 switch (e->expr_type)
4718 gfc_resolve_character_operator (e);
4721 if (e->expr_type == EXPR_ARRAY)
4722 gfc_resolve_character_array_constructor (e);
4724 case EXPR_SUBSTRING:
4725 if (!e->ts.u.cl && e->ref)
4726 gfc_resolve_substring_charlen (e);
4730 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4737 /* Update an actual argument to include the passed-object for type-bound
4738 procedures at the right position. */
4740 static gfc_actual_arglist*
4741 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
4744 gcc_assert (argpos > 0);
4748 gfc_actual_arglist* result;
4750 result = gfc_get_actual_arglist ();
4754 result->name = name;
4760 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
4762 lst = update_arglist_pass (NULL, po, argpos - 1, name);
4767 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4770 extract_compcall_passed_object (gfc_expr* e)
4774 gcc_assert (e->expr_type == EXPR_COMPCALL);
4776 if (e->value.compcall.base_object)
4777 po = gfc_copy_expr (e->value.compcall.base_object);
4780 po = gfc_get_expr ();
4781 po->expr_type = EXPR_VARIABLE;
4782 po->symtree = e->symtree;
4783 po->ref = gfc_copy_ref (e->ref);
4784 po->where = e->where;
4787 if (gfc_resolve_expr (po) == FAILURE)
4794 /* Update the arglist of an EXPR_COMPCALL expression to include the
4798 update_compcall_arglist (gfc_expr* e)
4801 gfc_typebound_proc* tbp;
4803 tbp = e->value.compcall.tbp;
4808 po = extract_compcall_passed_object (e);
4812 if (tbp->nopass || e->value.compcall.ignore_pass)
4818 gcc_assert (tbp->pass_arg_num > 0);
4819 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4827 /* Extract the passed object from a PPC call (a copy of it). */
4830 extract_ppc_passed_object (gfc_expr *e)
4835 po = gfc_get_expr ();
4836 po->expr_type = EXPR_VARIABLE;
4837 po->symtree = e->symtree;
4838 po->ref = gfc_copy_ref (e->ref);
4839 po->where = e->where;
4841 /* Remove PPC reference. */
4843 while ((*ref)->next)
4844 ref = &(*ref)->next;
4845 gfc_free_ref_list (*ref);
4848 if (gfc_resolve_expr (po) == FAILURE)
4855 /* Update the actual arglist of a procedure pointer component to include the
4859 update_ppc_arglist (gfc_expr* e)
4863 gfc_typebound_proc* tb;
4865 if (!gfc_is_proc_ptr_comp (e, &ppc))
4872 else if (tb->nopass)
4875 po = extract_ppc_passed_object (e);
4881 gfc_error ("Passed-object at %L must be scalar", &e->where);
4885 gcc_assert (tb->pass_arg_num > 0);
4886 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4894 /* Check that the object a TBP is called on is valid, i.e. it must not be
4895 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
4898 check_typebound_baseobject (gfc_expr* e)
4902 base = extract_compcall_passed_object (e);
4906 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
4908 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
4910 gfc_error ("Base object for type-bound procedure call at %L is of"
4911 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
4915 /* If the procedure called is NOPASS, the base object must be scalar. */
4916 if (e->value.compcall.tbp->nopass && base->rank > 0)
4918 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
4919 " be scalar", &e->where);
4923 /* FIXME: Remove once PR 41177 (this problem) is fixed completely. */
4926 gfc_error ("Non-scalar base object at %L currently not implemented",
4935 /* Resolve a call to a type-bound procedure, either function or subroutine,
4936 statically from the data in an EXPR_COMPCALL expression. The adapted
4937 arglist and the target-procedure symtree are returned. */
4940 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
4941 gfc_actual_arglist** actual)
4943 gcc_assert (e->expr_type == EXPR_COMPCALL);
4944 gcc_assert (!e->value.compcall.tbp->is_generic);
4946 /* Update the actual arglist for PASS. */
4947 if (update_compcall_arglist (e) == FAILURE)
4950 *actual = e->value.compcall.actual;
4951 *target = e->value.compcall.tbp->u.specific;
4953 gfc_free_ref_list (e->ref);
4955 e->value.compcall.actual = NULL;
4961 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
4962 which of the specific bindings (if any) matches the arglist and transform
4963 the expression into a call of that binding. */
4966 resolve_typebound_generic_call (gfc_expr* e)
4968 gfc_typebound_proc* genproc;
4969 const char* genname;
4971 gcc_assert (e->expr_type == EXPR_COMPCALL);
4972 genname = e->value.compcall.name;
4973 genproc = e->value.compcall.tbp;
4975 if (!genproc->is_generic)
4978 /* Try the bindings on this type and in the inheritance hierarchy. */
4979 for (; genproc; genproc = genproc->overridden)
4983 gcc_assert (genproc->is_generic);
4984 for (g = genproc->u.generic; g; g = g->next)
4987 gfc_actual_arglist* args;
4990 gcc_assert (g->specific);
4992 if (g->specific->error)
4995 target = g->specific->u.specific->n.sym;
4997 /* Get the right arglist by handling PASS/NOPASS. */
4998 args = gfc_copy_actual_arglist (e->value.compcall.actual);
4999 if (!g->specific->nopass)
5002 po = extract_compcall_passed_object (e);
5006 gcc_assert (g->specific->pass_arg_num > 0);
5007 gcc_assert (!g->specific->error);
5008 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5009 g->specific->pass_arg);
5011 resolve_actual_arglist (args, target->attr.proc,
5012 is_external_proc (target) && !target->formal);
5014 /* Check if this arglist matches the formal. */
5015 matches = gfc_arglist_matches_symbol (&args, target);
5017 /* Clean up and break out of the loop if we've found it. */
5018 gfc_free_actual_arglist (args);
5021 e->value.compcall.tbp = g->specific;
5027 /* Nothing matching found! */
5028 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5029 " '%s' at %L", genname, &e->where);
5037 /* Resolve a call to a type-bound subroutine. */
5040 resolve_typebound_call (gfc_code* c)
5042 gfc_actual_arglist* newactual;
5043 gfc_symtree* target;
5045 /* Check that's really a SUBROUTINE. */
5046 if (!c->expr1->value.compcall.tbp->subroutine)
5048 gfc_error ("'%s' at %L should be a SUBROUTINE",
5049 c->expr1->value.compcall.name, &c->loc);
5053 if (check_typebound_baseobject (c->expr1) == FAILURE)
5056 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
5059 /* Transform into an ordinary EXEC_CALL for now. */
5061 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5064 c->ext.actual = newactual;
5065 c->symtree = target;
5066 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5068 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5070 gfc_free_expr (c->expr1);
5071 c->expr1 = gfc_get_expr ();
5072 c->expr1->expr_type = EXPR_FUNCTION;
5073 c->expr1->symtree = target;
5074 c->expr1->where = c->loc;
5076 return resolve_call (c);
5080 /* Resolve a component-call expression. This originally was intended
5081 only to see functions. However, it is convenient to use it in
5082 resolving subroutine class methods, since we do not have to add a
5083 gfc_code each time. */
5085 resolve_compcall (gfc_expr* e, bool fcn)
5087 gfc_actual_arglist* newactual;
5088 gfc_symtree* target;
5090 /* Check that's really a FUNCTION. */
5091 if (fcn && !e->value.compcall.tbp->function)
5093 gfc_error ("'%s' at %L should be a FUNCTION",
5094 e->value.compcall.name, &e->where);
5097 else if (!fcn && !e->value.compcall.tbp->subroutine)
5099 /* To resolve class member calls, we borrow this bit
5100 of code to select the specific procedures. */
5101 gfc_error ("'%s' at %L should be a SUBROUTINE",
5102 e->value.compcall.name, &e->where);
5106 /* These must not be assign-calls! */
5107 gcc_assert (!e->value.compcall.assign);
5109 if (check_typebound_baseobject (e) == FAILURE)
5112 if (resolve_typebound_generic_call (e) == FAILURE)
5114 gcc_assert (!e->value.compcall.tbp->is_generic);
5116 /* Take the rank from the function's symbol. */
5117 if (e->value.compcall.tbp->u.specific->n.sym->as)
5118 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5120 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5121 arglist to the TBP's binding target. */
5123 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5126 e->value.function.actual = newactual;
5127 e->value.function.name = NULL;
5128 e->value.function.esym = target->n.sym;
5129 e->value.function.class_esym = NULL;
5130 e->value.function.isym = NULL;
5131 e->symtree = target;
5132 e->ts = target->n.sym->ts;
5133 e->expr_type = EXPR_FUNCTION;
5135 /* Resolution is not necessary if this is a class subroutine; this
5136 function only has to identify the specific proc. Resolution of
5137 the call will be done next in resolve_typebound_call. */
5138 return fcn ? gfc_resolve_expr (e) : SUCCESS;
5142 /* Resolve a typebound call for the members in a class. This group of
5143 functions implements dynamic dispatch in the provisional version
5144 of f03 OOP. As soon as vtables are in place and contain pointers
5145 to methods, this will no longer be necessary. */
5146 static gfc_expr *list_e;
5147 static void check_class_members (gfc_symbol *);
5148 static gfc_try class_try;
5149 static bool fcn_flag;
5150 static gfc_symbol *class_object;
5154 check_members (gfc_symbol *derived)
5156 if (derived->attr.flavor == FL_DERIVED)
5157 check_class_members (derived);
5162 check_class_members (gfc_symbol *derived)
5166 gfc_class_esym_list *etmp;
5168 e = gfc_copy_expr (list_e);
5170 tbp = gfc_find_typebound_proc (derived, &class_try,
5171 e->value.compcall.name,
5176 gfc_error ("no typebound available procedure named '%s' at %L",
5177 e->value.compcall.name, &e->where);
5181 /* If we have to match a passed class member, force the actual
5182 expression to have the correct type. */
5183 if (!tbp->n.tb->nopass)
5185 if (e->value.compcall.base_object == NULL)
5186 e->value.compcall.base_object = extract_compcall_passed_object (e);
5188 if (!derived->attr.abstract)
5190 e->value.compcall.base_object->ts.type = BT_DERIVED;
5191 e->value.compcall.base_object->ts.u.derived = derived;
5195 e->value.compcall.tbp = tbp->n.tb;
5196 e->value.compcall.name = tbp->name;
5198 /* Let the original expresssion catch the assertion in
5199 resolve_compcall, since this flag does not appear to be reset or
5200 copied in some systems. */
5201 e->value.compcall.assign = 0;
5203 /* Do the renaming, PASSing, generic => specific and other
5204 good things for each class member. */
5205 class_try = (resolve_compcall (e, fcn_flag) == SUCCESS)
5206 ? class_try : FAILURE;
5208 /* Now transfer the found symbol to the esym list. */
5209 if (class_try == SUCCESS)
5211 etmp = list_e->value.function.class_esym;
5212 list_e->value.function.class_esym
5213 = gfc_get_class_esym_list();
5214 list_e->value.function.class_esym->next = etmp;
5215 list_e->value.function.class_esym->derived = derived;
5216 list_e->value.function.class_esym->esym
5217 = e->value.function.esym;
5222 /* Burrow down into grandchildren types. */
5223 if (derived->f2k_derived)
5224 gfc_traverse_ns (derived->f2k_derived, check_members);
5228 /* Eliminate esym_lists where all the members point to the
5229 typebound procedure of the declared type; ie. one where
5230 type selection has no effect.. */
5232 resolve_class_esym (gfc_expr *e)
5234 gfc_class_esym_list *p, *q;
5237 gcc_assert (e && e->expr_type == EXPR_FUNCTION);
5239 p = e->value.function.class_esym;
5243 for (; p; p = p->next)
5244 empty = empty && (e->value.function.esym == p->esym);
5248 p = e->value.function.class_esym;
5254 e->value.function.class_esym = NULL;
5259 /* Generate an expression for the hash value, given the reference to
5260 the class of the final expression (class_ref), the base of the
5261 full reference list (new_ref), the declared type and the class
5264 hash_value_expr (gfc_ref *class_ref, gfc_ref *new_ref, gfc_symtree *st)
5266 gfc_expr *hash_value;
5268 /* Build an expression for the correct hash_value; ie. that of the last
5272 class_ref->next = NULL;
5276 gfc_free_ref_list (new_ref);
5279 hash_value = gfc_get_expr ();
5280 hash_value->expr_type = EXPR_VARIABLE;
5281 hash_value->symtree = st;
5282 hash_value->symtree->n.sym->refs++;
5283 hash_value->ref = new_ref;
5284 gfc_add_component_ref (hash_value, "$vptr");
5285 gfc_add_component_ref (hash_value, "$hash");
5291 /* Get the ultimate declared type from an expression. In addition,
5292 return the last class/derived type reference and the copy of the
5295 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5298 gfc_symbol *declared;
5303 *new_ref = gfc_copy_ref (e->ref);
5304 for (ref = *new_ref; ref; ref = ref->next)
5306 if (ref->type != REF_COMPONENT)
5309 if (ref->u.c.component->ts.type == BT_CLASS
5310 || ref->u.c.component->ts.type == BT_DERIVED)
5312 declared = ref->u.c.component->ts.u.derived;
5317 if (declared == NULL)
5318 declared = e->symtree->n.sym->ts.u.derived;
5324 /* Resolve the argument expressions so that any arguments expressions
5325 that include class methods are resolved before the current call.
5326 This is necessary because of the static variables used in CLASS
5327 method resolution. */
5329 resolve_arg_exprs (gfc_actual_arglist *arg)
5331 /* Resolve the actual arglist expressions. */
5332 for (; arg; arg = arg->next)
5335 gfc_resolve_expr (arg->expr);
5340 /* Resolve a CLASS typebound function, or 'method'. */
5342 resolve_class_compcall (gfc_expr* e)
5344 gfc_symbol *derived, *declared;
5350 class_object = st->n.sym;
5352 /* Get the CLASS declared type. */
5353 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5355 /* Weed out cases of the ultimate component being a derived type. */
5356 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5358 gfc_free_ref_list (new_ref);
5359 return resolve_compcall (e, true);
5362 /* Resolve the argument expressions, */
5363 resolve_arg_exprs (e->value.function.actual);
5365 /* Get the data component, which is of the declared type. */
5366 derived = declared->components->ts.u.derived;
5368 /* Resolve the function call for each member of the class. */
5369 class_try = SUCCESS;
5371 list_e = gfc_copy_expr (e);
5372 check_class_members (derived);
5374 class_try = (resolve_compcall (e, true) == SUCCESS)
5375 ? class_try : FAILURE;
5377 /* Transfer the class list to the original expression. Note that
5378 the class_esym list is cleaned up in trans-expr.c, as the calls
5380 e->value.function.class_esym = list_e->value.function.class_esym;
5381 list_e->value.function.class_esym = NULL;
5382 gfc_free_expr (list_e);
5384 resolve_class_esym (e);
5386 /* More than one typebound procedure so transmit an expression for
5387 the hash_value as the selector. */
5388 if (e->value.function.class_esym != NULL)
5389 e->value.function.class_esym->hash_value
5390 = hash_value_expr (class_ref, new_ref, st);
5395 /* Resolve a CLASS typebound subroutine, or 'method'. */
5397 resolve_class_typebound_call (gfc_code *code)
5399 gfc_symbol *derived, *declared;
5404 st = code->expr1->symtree;
5405 class_object = st->n.sym;
5407 /* Get the CLASS declared type. */
5408 declared = get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5410 /* Weed out cases of the ultimate component being a derived type. */
5411 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5413 gfc_free_ref_list (new_ref);
5414 return resolve_typebound_call (code);
5417 /* Resolve the argument expressions, */
5418 resolve_arg_exprs (code->expr1->value.compcall.actual);
5420 /* Get the data component, which is of the declared type. */
5421 derived = declared->components->ts.u.derived;
5423 class_try = SUCCESS;
5425 list_e = gfc_copy_expr (code->expr1);
5426 check_class_members (derived);
5428 class_try = (resolve_typebound_call (code) == SUCCESS)
5429 ? class_try : FAILURE;
5431 /* Transfer the class list to the original expression. Note that
5432 the class_esym list is cleaned up in trans-expr.c, as the calls
5434 code->expr1->value.function.class_esym
5435 = list_e->value.function.class_esym;
5436 list_e->value.function.class_esym = NULL;
5437 gfc_free_expr (list_e);
5439 resolve_class_esym (code->expr1);
5441 /* More than one typebound procedure so transmit an expression for
5442 the hash_value as the selector. */
5443 if (code->expr1->value.function.class_esym != NULL)
5444 code->expr1->value.function.class_esym->hash_value
5445 = hash_value_expr (class_ref, new_ref, st);
5451 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5454 resolve_ppc_call (gfc_code* c)
5456 gfc_component *comp;
5459 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5462 c->resolved_sym = c->expr1->symtree->n.sym;
5463 c->expr1->expr_type = EXPR_VARIABLE;
5465 if (!comp->attr.subroutine)
5466 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5468 if (resolve_ref (c->expr1) == FAILURE)
5471 if (update_ppc_arglist (c->expr1) == FAILURE)
5474 c->ext.actual = c->expr1->value.compcall.actual;
5476 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5477 comp->formal == NULL) == FAILURE)
5480 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5486 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5489 resolve_expr_ppc (gfc_expr* e)
5491 gfc_component *comp;
5494 b = gfc_is_proc_ptr_comp (e, &comp);
5497 /* Convert to EXPR_FUNCTION. */
5498 e->expr_type = EXPR_FUNCTION;
5499 e->value.function.isym = NULL;
5500 e->value.function.actual = e->value.compcall.actual;
5502 if (comp->as != NULL)
5503 e->rank = comp->as->rank;
5505 if (!comp->attr.function)
5506 gfc_add_function (&comp->attr, comp->name, &e->where);
5508 if (resolve_ref (e) == FAILURE)
5511 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5512 comp->formal == NULL) == FAILURE)
5515 if (update_ppc_arglist (e) == FAILURE)
5518 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5525 gfc_is_expandable_expr (gfc_expr *e)
5527 gfc_constructor *con;
5529 if (e->expr_type == EXPR_ARRAY)
5531 /* Traverse the constructor looking for variables that are flavor
5532 parameter. Parameters must be expanded since they are fully used at
5534 for (con = e->value.constructor; con; con = con->next)
5536 if (con->expr->expr_type == EXPR_VARIABLE
5537 && con->expr->symtree
5538 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
5539 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
5541 if (con->expr->expr_type == EXPR_ARRAY
5542 && gfc_is_expandable_expr (con->expr))
5550 /* Resolve an expression. That is, make sure that types of operands agree
5551 with their operators, intrinsic operators are converted to function calls
5552 for overloaded types and unresolved function references are resolved. */
5555 gfc_resolve_expr (gfc_expr *e)
5562 switch (e->expr_type)
5565 t = resolve_operator (e);
5571 if (check_host_association (e))
5572 t = resolve_function (e);
5575 t = resolve_variable (e);
5577 expression_rank (e);
5580 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5581 && e->ref->type != REF_SUBSTRING)
5582 gfc_resolve_substring_charlen (e);
5587 if (e->symtree && e->symtree->n.sym->ts.type == BT_CLASS)
5588 t = resolve_class_compcall (e);
5590 t = resolve_compcall (e, true);
5593 case EXPR_SUBSTRING:
5594 t = resolve_ref (e);
5603 t = resolve_expr_ppc (e);
5608 if (resolve_ref (e) == FAILURE)
5611 t = gfc_resolve_array_constructor (e);
5612 /* Also try to expand a constructor. */
5615 expression_rank (e);
5616 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
5617 gfc_expand_constructor (e);
5620 /* This provides the opportunity for the length of constructors with
5621 character valued function elements to propagate the string length
5622 to the expression. */
5623 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5625 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
5626 here rather then add a duplicate test for it above. */
5627 gfc_expand_constructor (e);
5628 t = gfc_resolve_character_array_constructor (e);
5633 case EXPR_STRUCTURE:
5634 t = resolve_ref (e);
5638 t = resolve_structure_cons (e);
5642 t = gfc_simplify_expr (e, 0);
5646 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5649 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5656 /* Resolve an expression from an iterator. They must be scalar and have
5657 INTEGER or (optionally) REAL type. */
5660 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5661 const char *name_msgid)
5663 if (gfc_resolve_expr (expr) == FAILURE)
5666 if (expr->rank != 0)
5668 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5672 if (expr->ts.type != BT_INTEGER)
5674 if (expr->ts.type == BT_REAL)
5677 return gfc_notify_std (GFC_STD_F95_DEL,
5678 "Deleted feature: %s at %L must be integer",
5679 _(name_msgid), &expr->where);
5682 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5689 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5697 /* Resolve the expressions in an iterator structure. If REAL_OK is
5698 false allow only INTEGER type iterators, otherwise allow REAL types. */
5701 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5703 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5707 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5709 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5714 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5715 "Start expression in DO loop") == FAILURE)
5718 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5719 "End expression in DO loop") == FAILURE)
5722 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5723 "Step expression in DO loop") == FAILURE)
5726 if (iter->step->expr_type == EXPR_CONSTANT)
5728 if ((iter->step->ts.type == BT_INTEGER
5729 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5730 || (iter->step->ts.type == BT_REAL
5731 && mpfr_sgn (iter->step->value.real) == 0))
5733 gfc_error ("Step expression in DO loop at %L cannot be zero",
5734 &iter->step->where);
5739 /* Convert start, end, and step to the same type as var. */
5740 if (iter->start->ts.kind != iter->var->ts.kind
5741 || iter->start->ts.type != iter->var->ts.type)
5742 gfc_convert_type (iter->start, &iter->var->ts, 2);
5744 if (iter->end->ts.kind != iter->var->ts.kind
5745 || iter->end->ts.type != iter->var->ts.type)
5746 gfc_convert_type (iter->end, &iter->var->ts, 2);
5748 if (iter->step->ts.kind != iter->var->ts.kind
5749 || iter->step->ts.type != iter->var->ts.type)
5750 gfc_convert_type (iter->step, &iter->var->ts, 2);
5752 if (iter->start->expr_type == EXPR_CONSTANT
5753 && iter->end->expr_type == EXPR_CONSTANT
5754 && iter->step->expr_type == EXPR_CONSTANT)
5757 if (iter->start->ts.type == BT_INTEGER)
5759 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5760 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5764 sgn = mpfr_sgn (iter->step->value.real);
5765 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5767 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5768 gfc_warning ("DO loop at %L will be executed zero times",
5769 &iter->step->where);
5776 /* Traversal function for find_forall_index. f == 2 signals that
5777 that variable itself is not to be checked - only the references. */
5780 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5782 if (expr->expr_type != EXPR_VARIABLE)
5785 /* A scalar assignment */
5786 if (!expr->ref || *f == 1)
5788 if (expr->symtree->n.sym == sym)
5800 /* Check whether the FORALL index appears in the expression or not.
5801 Returns SUCCESS if SYM is found in EXPR. */
5804 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5806 if (gfc_traverse_expr (expr, sym, forall_index, f))
5813 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5814 to be a scalar INTEGER variable. The subscripts and stride are scalar
5815 INTEGERs, and if stride is a constant it must be nonzero.
5816 Furthermore "A subscript or stride in a forall-triplet-spec shall
5817 not contain a reference to any index-name in the
5818 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5821 resolve_forall_iterators (gfc_forall_iterator *it)
5823 gfc_forall_iterator *iter, *iter2;
5825 for (iter = it; iter; iter = iter->next)
5827 if (gfc_resolve_expr (iter->var) == SUCCESS
5828 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5829 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5832 if (gfc_resolve_expr (iter->start) == SUCCESS
5833 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5834 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5835 &iter->start->where);
5836 if (iter->var->ts.kind != iter->start->ts.kind)
5837 gfc_convert_type (iter->start, &iter->var->ts, 2);
5839 if (gfc_resolve_expr (iter->end) == SUCCESS
5840 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5841 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5843 if (iter->var->ts.kind != iter->end->ts.kind)
5844 gfc_convert_type (iter->end, &iter->var->ts, 2);
5846 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5848 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5849 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5850 &iter->stride->where, "INTEGER");
5852 if (iter->stride->expr_type == EXPR_CONSTANT
5853 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5854 gfc_error ("FORALL stride expression at %L cannot be zero",
5855 &iter->stride->where);
5857 if (iter->var->ts.kind != iter->stride->ts.kind)
5858 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5861 for (iter = it; iter; iter = iter->next)
5862 for (iter2 = iter; iter2; iter2 = iter2->next)
5864 if (find_forall_index (iter2->start,
5865 iter->var->symtree->n.sym, 0) == SUCCESS
5866 || find_forall_index (iter2->end,
5867 iter->var->symtree->n.sym, 0) == SUCCESS
5868 || find_forall_index (iter2->stride,
5869 iter->var->symtree->n.sym, 0) == SUCCESS)
5870 gfc_error ("FORALL index '%s' may not appear in triplet "
5871 "specification at %L", iter->var->symtree->name,
5872 &iter2->start->where);
5877 /* Given a pointer to a symbol that is a derived type, see if it's
5878 inaccessible, i.e. if it's defined in another module and the components are
5879 PRIVATE. The search is recursive if necessary. Returns zero if no
5880 inaccessible components are found, nonzero otherwise. */
5883 derived_inaccessible (gfc_symbol *sym)
5887 if (sym->attr.use_assoc && sym->attr.private_comp)
5890 for (c = sym->components; c; c = c->next)
5892 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
5900 /* Resolve the argument of a deallocate expression. The expression must be
5901 a pointer or a full array. */
5904 resolve_deallocate_expr (gfc_expr *e)
5906 symbol_attribute attr;
5907 int allocatable, pointer, check_intent_in;
5912 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5913 check_intent_in = 1;
5915 if (gfc_resolve_expr (e) == FAILURE)
5918 if (e->expr_type != EXPR_VARIABLE)
5921 sym = e->symtree->n.sym;
5923 if (sym->ts.type == BT_CLASS)
5925 allocatable = sym->ts.u.derived->components->attr.allocatable;
5926 pointer = sym->ts.u.derived->components->attr.pointer;
5930 allocatable = sym->attr.allocatable;
5931 pointer = sym->attr.pointer;
5933 for (ref = e->ref; ref; ref = ref->next)
5936 check_intent_in = 0;
5941 if (ref->u.ar.type != AR_FULL)
5946 c = ref->u.c.component;
5947 if (c->ts.type == BT_CLASS)
5949 allocatable = c->ts.u.derived->components->attr.allocatable;
5950 pointer = c->ts.u.derived->components->attr.pointer;
5954 allocatable = c->attr.allocatable;
5955 pointer = c->attr.pointer;
5965 attr = gfc_expr_attr (e);
5967 if (allocatable == 0 && attr.pointer == 0)
5970 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5974 if (check_intent_in && sym->attr.intent == INTENT_IN)
5976 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5977 sym->name, &e->where);
5981 if (e->ts.type == BT_CLASS)
5983 /* Only deallocate the DATA component. */
5984 gfc_add_component_ref (e, "$data");
5991 /* Returns true if the expression e contains a reference to the symbol sym. */
5993 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5995 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6002 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6004 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6008 /* Given the expression node e for an allocatable/pointer of derived type to be
6009 allocated, get the expression node to be initialized afterwards (needed for
6010 derived types with default initializers, and derived types with allocatable
6011 components that need nullification.) */
6014 gfc_expr_to_initialize (gfc_expr *e)
6020 result = gfc_copy_expr (e);
6022 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6023 for (ref = result->ref; ref; ref = ref->next)
6024 if (ref->type == REF_ARRAY && ref->next == NULL)
6026 ref->u.ar.type = AR_FULL;
6028 for (i = 0; i < ref->u.ar.dimen; i++)
6029 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6031 result->rank = ref->u.ar.dimen;
6039 /* Used in resolve_allocate_expr to check that a allocation-object and
6040 a source-expr are conformable. This does not catch all possible
6041 cases; in particular a runtime checking is needed. */
6044 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6046 /* First compare rank. */
6047 if (e2->ref && e1->rank != e2->ref->u.ar.as->rank)
6049 gfc_error ("Source-expr at %L must be scalar or have the "
6050 "same rank as the allocate-object at %L",
6051 &e1->where, &e2->where);
6062 for (i = 0; i < e1->rank; i++)
6064 if (e2->ref->u.ar.end[i])
6066 mpz_set (s, e2->ref->u.ar.end[i]->value.integer);
6067 mpz_sub (s, s, e2->ref->u.ar.start[i]->value.integer);
6068 mpz_add_ui (s, s, 1);
6072 mpz_set (s, e2->ref->u.ar.start[i]->value.integer);
6075 if (mpz_cmp (e1->shape[i], s) != 0)
6077 gfc_error ("Source-expr at %L and allocate-object at %L must "
6078 "have the same shape", &e1->where, &e2->where);
6091 /* Resolve the expression in an ALLOCATE statement, doing the additional
6092 checks to see whether the expression is OK or not. The expression must
6093 have a trailing array reference that gives the size of the array. */
6096 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6098 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6099 symbol_attribute attr;
6100 gfc_ref *ref, *ref2;
6107 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6108 check_intent_in = 1;
6110 if (gfc_resolve_expr (e) == FAILURE)
6113 /* Make sure the expression is allocatable or a pointer. If it is
6114 pointer, the next-to-last reference must be a pointer. */
6118 sym = e->symtree->n.sym;
6120 /* Check whether ultimate component is abstract and CLASS. */
6123 if (e->expr_type != EXPR_VARIABLE)
6126 attr = gfc_expr_attr (e);
6127 pointer = attr.pointer;
6128 dimension = attr.dimension;
6132 if (sym->ts.type == BT_CLASS)
6134 allocatable = sym->ts.u.derived->components->attr.allocatable;
6135 pointer = sym->ts.u.derived->components->attr.pointer;
6136 dimension = sym->ts.u.derived->components->attr.dimension;
6137 is_abstract = sym->ts.u.derived->components->attr.abstract;
6141 allocatable = sym->attr.allocatable;
6142 pointer = sym->attr.pointer;
6143 dimension = sym->attr.dimension;
6146 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6149 check_intent_in = 0;
6154 if (ref->next != NULL)
6159 c = ref->u.c.component;
6160 if (c->ts.type == BT_CLASS)
6162 allocatable = c->ts.u.derived->components->attr.allocatable;
6163 pointer = c->ts.u.derived->components->attr.pointer;
6164 dimension = c->ts.u.derived->components->attr.dimension;
6165 is_abstract = c->ts.u.derived->components->attr.abstract;
6169 allocatable = c->attr.allocatable;
6170 pointer = c->attr.pointer;
6171 dimension = c->attr.dimension;
6172 is_abstract = c->attr.abstract;
6184 if (allocatable == 0 && pointer == 0)
6186 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6191 /* Some checks for the SOURCE tag. */
6194 /* Check F03:C631. */
6195 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6197 gfc_error ("Type of entity at %L is type incompatible with "
6198 "source-expr at %L", &e->where, &code->expr3->where);
6202 /* Check F03:C632 and restriction following Note 6.18. */
6203 if (code->expr3->rank > 0
6204 && conformable_arrays (code->expr3, e) == FAILURE)
6207 /* Check F03:C633. */
6208 if (code->expr3->ts.kind != e->ts.kind)
6210 gfc_error ("The allocate-object at %L and the source-expr at %L "
6211 "shall have the same kind type parameter",
6212 &e->where, &code->expr3->where);
6216 else if (is_abstract&& code->ext.alloc.ts.type == BT_UNKNOWN)
6218 gcc_assert (e->ts.type == BT_CLASS);
6219 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6220 "type-spec or SOURCE=", sym->name, &e->where);
6224 if (check_intent_in && sym->attr.intent == INTENT_IN)
6226 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6227 sym->name, &e->where);
6233 /* Add default initializer for those derived types that need them. */
6234 if (e->ts.type == BT_DERIVED
6235 && (init_e = gfc_default_initializer (&e->ts)))
6237 gfc_code *init_st = gfc_get_code ();
6238 init_st->loc = code->loc;
6239 init_st->op = EXEC_INIT_ASSIGN;
6240 init_st->expr1 = gfc_expr_to_initialize (e);
6241 init_st->expr2 = init_e;
6242 init_st->next = code->next;
6243 code->next = init_st;
6245 else if (e->ts.type == BT_CLASS
6246 && ((code->ext.alloc.ts.type == BT_UNKNOWN
6247 && (init_e = gfc_default_initializer (&e->ts.u.derived->components->ts)))
6248 || (code->ext.alloc.ts.type == BT_DERIVED
6249 && (init_e = gfc_default_initializer (&code->ext.alloc.ts)))))
6251 gfc_code *init_st = gfc_get_code ();
6252 init_st->loc = code->loc;
6253 init_st->op = EXEC_INIT_ASSIGN;
6254 init_st->expr1 = gfc_expr_to_initialize (e);
6255 init_st->expr2 = init_e;
6256 init_st->next = code->next;
6257 code->next = init_st;
6261 if (pointer || dimension == 0)
6264 /* Make sure the next-to-last reference node is an array specification. */
6266 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
6268 gfc_error ("Array specification required in ALLOCATE statement "
6269 "at %L", &e->where);
6273 /* Make sure that the array section reference makes sense in the
6274 context of an ALLOCATE specification. */
6278 for (i = 0; i < ar->dimen; i++)
6280 if (ref2->u.ar.type == AR_ELEMENT)
6283 switch (ar->dimen_type[i])
6289 if (ar->start[i] != NULL
6290 && ar->end[i] != NULL
6291 && ar->stride[i] == NULL)
6294 /* Fall Through... */
6298 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6305 for (a = code->ext.alloc.list; a; a = a->next)
6307 sym = a->expr->symtree->n.sym;
6309 /* TODO - check derived type components. */
6310 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6313 if ((ar->start[i] != NULL
6314 && gfc_find_sym_in_expr (sym, ar->start[i]))
6315 || (ar->end[i] != NULL
6316 && gfc_find_sym_in_expr (sym, ar->end[i])))
6318 gfc_error ("'%s' must not appear in the array specification at "
6319 "%L in the same ALLOCATE statement where it is "
6320 "itself allocated", sym->name, &ar->where);
6330 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6332 gfc_expr *stat, *errmsg, *pe, *qe;
6333 gfc_alloc *a, *p, *q;
6335 stat = code->expr1 ? code->expr1 : NULL;
6337 errmsg = code->expr2 ? code->expr2 : NULL;
6339 /* Check the stat variable. */
6342 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6343 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6344 stat->symtree->n.sym->name, &stat->where);
6346 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6347 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6350 if ((stat->ts.type != BT_INTEGER
6351 && !(stat->ref && (stat->ref->type == REF_ARRAY
6352 || stat->ref->type == REF_COMPONENT)))
6354 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6355 "variable", &stat->where);
6357 for (p = code->ext.alloc.list; p; p = p->next)
6358 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6359 gfc_error ("Stat-variable at %L shall not be %sd within "
6360 "the same %s statement", &stat->where, fcn, fcn);
6363 /* Check the errmsg variable. */
6367 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6370 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6371 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6372 errmsg->symtree->n.sym->name, &errmsg->where);
6374 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6375 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6378 if ((errmsg->ts.type != BT_CHARACTER
6380 && (errmsg->ref->type == REF_ARRAY
6381 || errmsg->ref->type == REF_COMPONENT)))
6382 || errmsg->rank > 0 )
6383 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6384 "variable", &errmsg->where);
6386 for (p = code->ext.alloc.list; p; p = p->next)
6387 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6388 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6389 "the same %s statement", &errmsg->where, fcn, fcn);
6392 /* Check that an allocate-object appears only once in the statement.
6393 FIXME: Checking derived types is disabled. */
6394 for (p = code->ext.alloc.list; p; p = p->next)
6397 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6398 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6400 for (q = p->next; q; q = q->next)
6403 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6404 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6405 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6406 gfc_error ("Allocate-object at %L also appears at %L",
6407 &pe->where, &qe->where);
6412 if (strcmp (fcn, "ALLOCATE") == 0)
6414 for (a = code->ext.alloc.list; a; a = a->next)
6415 resolve_allocate_expr (a->expr, code);
6419 for (a = code->ext.alloc.list; a; a = a->next)
6420 resolve_deallocate_expr (a->expr);
6425 /************ SELECT CASE resolution subroutines ************/
6427 /* Callback function for our mergesort variant. Determines interval
6428 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6429 op1 > op2. Assumes we're not dealing with the default case.
6430 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6431 There are nine situations to check. */
6434 compare_cases (const gfc_case *op1, const gfc_case *op2)
6438 if (op1->low == NULL) /* op1 = (:L) */
6440 /* op2 = (:N), so overlap. */
6442 /* op2 = (M:) or (M:N), L < M */
6443 if (op2->low != NULL
6444 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6447 else if (op1->high == NULL) /* op1 = (K:) */
6449 /* op2 = (M:), so overlap. */
6451 /* op2 = (:N) or (M:N), K > N */
6452 if (op2->high != NULL
6453 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6456 else /* op1 = (K:L) */
6458 if (op2->low == NULL) /* op2 = (:N), K > N */
6459 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6461 else if (op2->high == NULL) /* op2 = (M:), L < M */
6462 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6464 else /* op2 = (M:N) */
6468 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6471 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6480 /* Merge-sort a double linked case list, detecting overlap in the
6481 process. LIST is the head of the double linked case list before it
6482 is sorted. Returns the head of the sorted list if we don't see any
6483 overlap, or NULL otherwise. */
6486 check_case_overlap (gfc_case *list)
6488 gfc_case *p, *q, *e, *tail;
6489 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6491 /* If the passed list was empty, return immediately. */
6498 /* Loop unconditionally. The only exit from this loop is a return
6499 statement, when we've finished sorting the case list. */
6506 /* Count the number of merges we do in this pass. */
6509 /* Loop while there exists a merge to be done. */
6514 /* Count this merge. */
6517 /* Cut the list in two pieces by stepping INSIZE places
6518 forward in the list, starting from P. */
6521 for (i = 0; i < insize; i++)
6530 /* Now we have two lists. Merge them! */
6531 while (psize > 0 || (qsize > 0 && q != NULL))
6533 /* See from which the next case to merge comes from. */
6536 /* P is empty so the next case must come from Q. */
6541 else if (qsize == 0 || q == NULL)
6550 cmp = compare_cases (p, q);
6553 /* The whole case range for P is less than the
6561 /* The whole case range for Q is greater than
6562 the case range for P. */
6569 /* The cases overlap, or they are the same
6570 element in the list. Either way, we must
6571 issue an error and get the next case from P. */
6572 /* FIXME: Sort P and Q by line number. */
6573 gfc_error ("CASE label at %L overlaps with CASE "
6574 "label at %L", &p->where, &q->where);
6582 /* Add the next element to the merged list. */
6591 /* P has now stepped INSIZE places along, and so has Q. So
6592 they're the same. */
6597 /* If we have done only one merge or none at all, we've
6598 finished sorting the cases. */
6607 /* Otherwise repeat, merging lists twice the size. */
6613 /* Check to see if an expression is suitable for use in a CASE statement.
6614 Makes sure that all case expressions are scalar constants of the same
6615 type. Return FAILURE if anything is wrong. */
6618 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6620 if (e == NULL) return SUCCESS;
6622 if (e->ts.type != case_expr->ts.type)
6624 gfc_error ("Expression in CASE statement at %L must be of type %s",
6625 &e->where, gfc_basic_typename (case_expr->ts.type));
6629 /* C805 (R808) For a given case-construct, each case-value shall be of
6630 the same type as case-expr. For character type, length differences
6631 are allowed, but the kind type parameters shall be the same. */
6633 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6635 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6636 &e->where, case_expr->ts.kind);
6640 /* Convert the case value kind to that of case expression kind, if needed.
6641 FIXME: Should a warning be issued? */
6642 if (e->ts.kind != case_expr->ts.kind)
6643 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6647 gfc_error ("Expression in CASE statement at %L must be scalar",
6656 /* Given a completely parsed select statement, we:
6658 - Validate all expressions and code within the SELECT.
6659 - Make sure that the selection expression is not of the wrong type.
6660 - Make sure that no case ranges overlap.
6661 - Eliminate unreachable cases and unreachable code resulting from
6662 removing case labels.
6664 The standard does allow unreachable cases, e.g. CASE (5:3). But
6665 they are a hassle for code generation, and to prevent that, we just
6666 cut them out here. This is not necessary for overlapping cases
6667 because they are illegal and we never even try to generate code.
6669 We have the additional caveat that a SELECT construct could have
6670 been a computed GOTO in the source code. Fortunately we can fairly
6671 easily work around that here: The case_expr for a "real" SELECT CASE
6672 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6673 we have to do is make sure that the case_expr is a scalar integer
6677 resolve_select (gfc_code *code)
6680 gfc_expr *case_expr;
6681 gfc_case *cp, *default_case, *tail, *head;
6682 int seen_unreachable;
6688 if (code->expr1 == NULL)
6690 /* This was actually a computed GOTO statement. */
6691 case_expr = code->expr2;
6692 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6693 gfc_error ("Selection expression in computed GOTO statement "
6694 "at %L must be a scalar integer expression",
6697 /* Further checking is not necessary because this SELECT was built
6698 by the compiler, so it should always be OK. Just move the
6699 case_expr from expr2 to expr so that we can handle computed
6700 GOTOs as normal SELECTs from here on. */
6701 code->expr1 = code->expr2;
6706 case_expr = code->expr1;
6708 type = case_expr->ts.type;
6709 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6711 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6712 &case_expr->where, gfc_typename (&case_expr->ts));
6714 /* Punt. Going on here just produce more garbage error messages. */
6718 if (case_expr->rank != 0)
6720 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6721 "expression", &case_expr->where);
6727 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6728 of the SELECT CASE expression and its CASE values. Walk the lists
6729 of case values, and if we find a mismatch, promote case_expr to
6730 the appropriate kind. */
6732 if (type == BT_LOGICAL || type == BT_INTEGER)
6734 for (body = code->block; body; body = body->block)
6736 /* Walk the case label list. */
6737 for (cp = body->ext.case_list; cp; cp = cp->next)
6739 /* Intercept the DEFAULT case. It does not have a kind. */
6740 if (cp->low == NULL && cp->high == NULL)
6743 /* Unreachable case ranges are discarded, so ignore. */
6744 if (cp->low != NULL && cp->high != NULL
6745 && cp->low != cp->high
6746 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6749 /* FIXME: Should a warning be issued? */
6751 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6752 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6754 if (cp->high != NULL
6755 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6756 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6761 /* Assume there is no DEFAULT case. */
6762 default_case = NULL;
6767 for (body = code->block; body; body = body->block)
6769 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6771 seen_unreachable = 0;
6773 /* Walk the case label list, making sure that all case labels
6775 for (cp = body->ext.case_list; cp; cp = cp->next)
6777 /* Count the number of cases in the whole construct. */
6780 /* Intercept the DEFAULT case. */
6781 if (cp->low == NULL && cp->high == NULL)
6783 if (default_case != NULL)
6785 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6786 "by a second DEFAULT CASE at %L",
6787 &default_case->where, &cp->where);
6798 /* Deal with single value cases and case ranges. Errors are
6799 issued from the validation function. */
6800 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
6801 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
6807 if (type == BT_LOGICAL
6808 && ((cp->low == NULL || cp->high == NULL)
6809 || cp->low != cp->high))
6811 gfc_error ("Logical range in CASE statement at %L is not "
6812 "allowed", &cp->low->where);
6817 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
6820 value = cp->low->value.logical == 0 ? 2 : 1;
6821 if (value & seen_logical)
6823 gfc_error ("constant logical value in CASE statement "
6824 "is repeated at %L",
6829 seen_logical |= value;
6832 if (cp->low != NULL && cp->high != NULL
6833 && cp->low != cp->high
6834 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6836 if (gfc_option.warn_surprising)
6837 gfc_warning ("Range specification at %L can never "
6838 "be matched", &cp->where);
6840 cp->unreachable = 1;
6841 seen_unreachable = 1;
6845 /* If the case range can be matched, it can also overlap with
6846 other cases. To make sure it does not, we put it in a
6847 double linked list here. We sort that with a merge sort
6848 later on to detect any overlapping cases. */
6852 head->right = head->left = NULL;
6857 tail->right->left = tail;
6864 /* It there was a failure in the previous case label, give up
6865 for this case label list. Continue with the next block. */
6869 /* See if any case labels that are unreachable have been seen.
6870 If so, we eliminate them. This is a bit of a kludge because
6871 the case lists for a single case statement (label) is a
6872 single forward linked lists. */
6873 if (seen_unreachable)
6875 /* Advance until the first case in the list is reachable. */
6876 while (body->ext.case_list != NULL
6877 && body->ext.case_list->unreachable)
6879 gfc_case *n = body->ext.case_list;
6880 body->ext.case_list = body->ext.case_list->next;
6882 gfc_free_case_list (n);
6885 /* Strip all other unreachable cases. */
6886 if (body->ext.case_list)
6888 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6890 if (cp->next->unreachable)
6892 gfc_case *n = cp->next;
6893 cp->next = cp->next->next;
6895 gfc_free_case_list (n);
6902 /* See if there were overlapping cases. If the check returns NULL,
6903 there was overlap. In that case we don't do anything. If head
6904 is non-NULL, we prepend the DEFAULT case. The sorted list can
6905 then used during code generation for SELECT CASE constructs with
6906 a case expression of a CHARACTER type. */
6909 head = check_case_overlap (head);
6911 /* Prepend the default_case if it is there. */
6912 if (head != NULL && default_case)
6914 default_case->left = NULL;
6915 default_case->right = head;
6916 head->left = default_case;
6920 /* Eliminate dead blocks that may be the result if we've seen
6921 unreachable case labels for a block. */
6922 for (body = code; body && body->block; body = body->block)
6924 if (body->block->ext.case_list == NULL)
6926 /* Cut the unreachable block from the code chain. */
6927 gfc_code *c = body->block;
6928 body->block = c->block;
6930 /* Kill the dead block, but not the blocks below it. */
6932 gfc_free_statements (c);
6936 /* More than two cases is legal but insane for logical selects.
6937 Issue a warning for it. */
6938 if (gfc_option.warn_surprising && type == BT_LOGICAL
6940 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6945 /* Check if a derived type is extensible. */
6948 gfc_type_is_extensible (gfc_symbol *sym)
6950 return !(sym->attr.is_bind_c || sym->attr.sequence);
6954 /* Resolve a SELECT TYPE statement. */
6957 resolve_select_type (gfc_code *code)
6959 gfc_symbol *selector_type;
6960 gfc_code *body, *new_st, *if_st, *tail;
6961 gfc_code *class_is = NULL, *default_case = NULL;
6964 char name[GFC_MAX_SYMBOL_LEN];
6972 selector_type = code->expr2->ts.u.derived->components->ts.u.derived;
6974 selector_type = code->expr1->ts.u.derived->components->ts.u.derived;
6976 /* Loop over TYPE IS / CLASS IS cases. */
6977 for (body = code->block; body; body = body->block)
6979 c = body->ext.case_list;
6981 /* Check F03:C815. */
6982 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6983 && !gfc_type_is_extensible (c->ts.u.derived))
6985 gfc_error ("Derived type '%s' at %L must be extensible",
6986 c->ts.u.derived->name, &c->where);
6991 /* Check F03:C816. */
6992 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6993 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
6995 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
6996 c->ts.u.derived->name, &c->where, selector_type->name);
7001 /* Intercept the DEFAULT case. */
7002 if (c->ts.type == BT_UNKNOWN)
7004 /* Check F03:C818. */
7007 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7008 "by a second DEFAULT CASE at %L",
7009 &default_case->ext.case_list->where, &c->where);
7014 default_case = body;
7023 /* Insert assignment for selector variable. */
7024 new_st = gfc_get_code ();
7025 new_st->op = EXEC_ASSIGN;
7026 new_st->expr1 = gfc_copy_expr (code->expr1);
7027 new_st->expr2 = gfc_copy_expr (code->expr2);
7031 /* Put SELECT TYPE statement inside a BLOCK. */
7032 new_st = gfc_get_code ();
7033 new_st->op = code->op;
7034 new_st->expr1 = code->expr1;
7035 new_st->expr2 = code->expr2;
7036 new_st->block = code->block;
7040 ns->code->next = new_st;
7041 code->op = EXEC_BLOCK;
7042 code->expr1 = code->expr2 = NULL;
7047 /* Transform to EXEC_SELECT. */
7048 code->op = EXEC_SELECT;
7049 gfc_add_component_ref (code->expr1, "$vptr");
7050 gfc_add_component_ref (code->expr1, "$hash");
7052 /* Loop over TYPE IS / CLASS IS cases. */
7053 for (body = code->block; body; body = body->block)
7055 c = body->ext.case_list;
7057 if (c->ts.type == BT_DERIVED)
7058 c->low = c->high = gfc_int_expr (c->ts.u.derived->hash_value);
7059 else if (c->ts.type == BT_UNKNOWN)
7062 /* Assign temporary to selector. */
7063 if (c->ts.type == BT_CLASS)
7064 sprintf (name, "tmp$class$%s", c->ts.u.derived->name);
7066 sprintf (name, "tmp$type$%s", c->ts.u.derived->name);
7067 st = gfc_find_symtree (ns->sym_root, name);
7068 new_st = gfc_get_code ();
7069 new_st->expr1 = gfc_get_variable_expr (st);
7070 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
7071 if (c->ts.type == BT_DERIVED)
7073 new_st->op = EXEC_POINTER_ASSIGN;
7074 gfc_add_component_ref (new_st->expr2, "$data");
7077 new_st->op = EXEC_POINTER_ASSIGN;
7078 new_st->next = body->next;
7079 body->next = new_st;
7082 /* Take out CLASS IS cases for separate treatment. */
7084 while (body && body->block)
7086 if (body->block->ext.case_list->ts.type == BT_CLASS)
7088 /* Add to class_is list. */
7089 if (class_is == NULL)
7091 class_is = body->block;
7096 for (tail = class_is; tail->block; tail = tail->block) ;
7097 tail->block = body->block;
7100 /* Remove from EXEC_SELECT list. */
7101 body->block = body->block->block;
7114 /* Add a default case to hold the CLASS IS cases. */
7115 for (tail = code; tail->block; tail = tail->block) ;
7116 tail->block = gfc_get_code ();
7118 tail->op = EXEC_SELECT_TYPE;
7119 tail->ext.case_list = gfc_get_case ();
7120 tail->ext.case_list->ts.type = BT_UNKNOWN;
7122 default_case = tail;
7125 /* More than one CLASS IS block? */
7126 if (class_is->block)
7130 /* Sort CLASS IS blocks by extension level. */
7134 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7137 /* F03:C817 (check for doubles). */
7138 if ((*c1)->ext.case_list->ts.u.derived->hash_value
7139 == c2->ext.case_list->ts.u.derived->hash_value)
7141 gfc_error ("Double CLASS IS block in SELECT TYPE "
7142 "statement at %L", &c2->ext.case_list->where);
7145 if ((*c1)->ext.case_list->ts.u.derived->attr.extension
7146 < c2->ext.case_list->ts.u.derived->attr.extension)
7149 (*c1)->block = c2->block;
7159 /* Generate IF chain. */
7160 if_st = gfc_get_code ();
7161 if_st->op = EXEC_IF;
7163 for (body = class_is; body; body = body->block)
7165 new_st->block = gfc_get_code ();
7166 new_st = new_st->block;
7167 new_st->op = EXEC_IF;
7168 /* Set up IF condition: Call _gfortran_is_extension_of. */
7169 new_st->expr1 = gfc_get_expr ();
7170 new_st->expr1->expr_type = EXPR_FUNCTION;
7171 new_st->expr1->ts.type = BT_LOGICAL;
7172 new_st->expr1->ts.kind = 4;
7173 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
7174 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
7175 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
7176 /* Set up arguments. */
7177 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
7178 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
7179 gfc_add_component_ref (new_st->expr1->value.function.actual->expr, "$vptr");
7180 vtab = gfc_find_derived_vtab (body->ext.case_list->ts.u.derived);
7181 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
7182 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
7183 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
7184 new_st->next = body->next;
7186 if (default_case->next)
7188 new_st->block = gfc_get_code ();
7189 new_st = new_st->block;
7190 new_st->op = EXEC_IF;
7191 new_st->next = default_case->next;
7194 /* Replace CLASS DEFAULT code by the IF chain. */
7195 default_case->next = if_st;
7198 resolve_select (code);
7203 /* Resolve a transfer statement. This is making sure that:
7204 -- a derived type being transferred has only non-pointer components
7205 -- a derived type being transferred doesn't have private components, unless
7206 it's being transferred from the module where the type was defined
7207 -- we're not trying to transfer a whole assumed size array. */
7210 resolve_transfer (gfc_code *code)
7219 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
7222 sym = exp->symtree->n.sym;
7225 /* Go to actual component transferred. */
7226 for (ref = code->expr1->ref; ref; ref = ref->next)
7227 if (ref->type == REF_COMPONENT)
7228 ts = &ref->u.c.component->ts;
7230 if (ts->type == BT_DERIVED)
7232 /* Check that transferred derived type doesn't contain POINTER
7234 if (ts->u.derived->attr.pointer_comp)
7236 gfc_error ("Data transfer element at %L cannot have "
7237 "POINTER components", &code->loc);
7241 if (ts->u.derived->attr.alloc_comp)
7243 gfc_error ("Data transfer element at %L cannot have "
7244 "ALLOCATABLE components", &code->loc);
7248 if (derived_inaccessible (ts->u.derived))
7250 gfc_error ("Data transfer element at %L cannot have "
7251 "PRIVATE components",&code->loc);
7256 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7257 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7259 gfc_error ("Data transfer element at %L cannot be a full reference to "
7260 "an assumed-size array", &code->loc);
7266 /*********** Toplevel code resolution subroutines ***********/
7268 /* Find the set of labels that are reachable from this block. We also
7269 record the last statement in each block. */
7272 find_reachable_labels (gfc_code *block)
7279 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7281 /* Collect labels in this block. We don't keep those corresponding
7282 to END {IF|SELECT}, these are checked in resolve_branch by going
7283 up through the code_stack. */
7284 for (c = block; c; c = c->next)
7286 if (c->here && c->op != EXEC_END_BLOCK)
7287 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7290 /* Merge with labels from parent block. */
7293 gcc_assert (cs_base->prev->reachable_labels);
7294 bitmap_ior_into (cs_base->reachable_labels,
7295 cs_base->prev->reachable_labels);
7299 /* Given a branch to a label, see if the branch is conforming.
7300 The code node describes where the branch is located. */
7303 resolve_branch (gfc_st_label *label, gfc_code *code)
7310 /* Step one: is this a valid branching target? */
7312 if (label->defined == ST_LABEL_UNKNOWN)
7314 gfc_error ("Label %d referenced at %L is never defined", label->value,
7319 if (label->defined != ST_LABEL_TARGET)
7321 gfc_error ("Statement at %L is not a valid branch target statement "
7322 "for the branch statement at %L", &label->where, &code->loc);
7326 /* Step two: make sure this branch is not a branch to itself ;-) */
7328 if (code->here == label)
7330 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7334 /* Step three: See if the label is in the same block as the
7335 branching statement. The hard work has been done by setting up
7336 the bitmap reachable_labels. */
7338 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7341 /* Step four: If we haven't found the label in the bitmap, it may
7342 still be the label of the END of the enclosing block, in which
7343 case we find it by going up the code_stack. */
7345 for (stack = cs_base; stack; stack = stack->prev)
7346 if (stack->current->next && stack->current->next->here == label)
7351 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7355 /* The label is not in an enclosing block, so illegal. This was
7356 allowed in Fortran 66, so we allow it as extension. No
7357 further checks are necessary in this case. */
7358 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7359 "as the GOTO statement at %L", &label->where,
7365 /* Check whether EXPR1 has the same shape as EXPR2. */
7368 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7370 mpz_t shape[GFC_MAX_DIMENSIONS];
7371 mpz_t shape2[GFC_MAX_DIMENSIONS];
7372 gfc_try result = FAILURE;
7375 /* Compare the rank. */
7376 if (expr1->rank != expr2->rank)
7379 /* Compare the size of each dimension. */
7380 for (i=0; i<expr1->rank; i++)
7382 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7385 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7388 if (mpz_cmp (shape[i], shape2[i]))
7392 /* When either of the two expression is an assumed size array, we
7393 ignore the comparison of dimension sizes. */
7398 for (i--; i >= 0; i--)
7400 mpz_clear (shape[i]);
7401 mpz_clear (shape2[i]);
7407 /* Check whether a WHERE assignment target or a WHERE mask expression
7408 has the same shape as the outmost WHERE mask expression. */
7411 resolve_where (gfc_code *code, gfc_expr *mask)
7417 cblock = code->block;
7419 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7420 In case of nested WHERE, only the outmost one is stored. */
7421 if (mask == NULL) /* outmost WHERE */
7423 else /* inner WHERE */
7430 /* Check if the mask-expr has a consistent shape with the
7431 outmost WHERE mask-expr. */
7432 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7433 gfc_error ("WHERE mask at %L has inconsistent shape",
7434 &cblock->expr1->where);
7437 /* the assignment statement of a WHERE statement, or the first
7438 statement in where-body-construct of a WHERE construct */
7439 cnext = cblock->next;
7444 /* WHERE assignment statement */
7447 /* Check shape consistent for WHERE assignment target. */
7448 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7449 gfc_error ("WHERE assignment target at %L has "
7450 "inconsistent shape", &cnext->expr1->where);
7454 case EXEC_ASSIGN_CALL:
7455 resolve_call (cnext);
7456 if (!cnext->resolved_sym->attr.elemental)
7457 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7458 &cnext->ext.actual->expr->where);
7461 /* WHERE or WHERE construct is part of a where-body-construct */
7463 resolve_where (cnext, e);
7467 gfc_error ("Unsupported statement inside WHERE at %L",
7470 /* the next statement within the same where-body-construct */
7471 cnext = cnext->next;
7473 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7474 cblock = cblock->block;
7479 /* Resolve assignment in FORALL construct.
7480 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7481 FORALL index variables. */
7484 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7488 for (n = 0; n < nvar; n++)
7490 gfc_symbol *forall_index;
7492 forall_index = var_expr[n]->symtree->n.sym;
7494 /* Check whether the assignment target is one of the FORALL index
7496 if ((code->expr1->expr_type == EXPR_VARIABLE)
7497 && (code->expr1->symtree->n.sym == forall_index))
7498 gfc_error ("Assignment to a FORALL index variable at %L",
7499 &code->expr1->where);
7502 /* If one of the FORALL index variables doesn't appear in the
7503 assignment variable, then there could be a many-to-one
7504 assignment. Emit a warning rather than an error because the
7505 mask could be resolving this problem. */
7506 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7507 gfc_warning ("The FORALL with index '%s' is not used on the "
7508 "left side of the assignment at %L and so might "
7509 "cause multiple assignment to this object",
7510 var_expr[n]->symtree->name, &code->expr1->where);
7516 /* Resolve WHERE statement in FORALL construct. */
7519 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7520 gfc_expr **var_expr)
7525 cblock = code->block;
7528 /* the assignment statement of a WHERE statement, or the first
7529 statement in where-body-construct of a WHERE construct */
7530 cnext = cblock->next;
7535 /* WHERE assignment statement */
7537 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7540 /* WHERE operator assignment statement */
7541 case EXEC_ASSIGN_CALL:
7542 resolve_call (cnext);
7543 if (!cnext->resolved_sym->attr.elemental)
7544 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7545 &cnext->ext.actual->expr->where);
7548 /* WHERE or WHERE construct is part of a where-body-construct */
7550 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7554 gfc_error ("Unsupported statement inside WHERE at %L",
7557 /* the next statement within the same where-body-construct */
7558 cnext = cnext->next;
7560 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7561 cblock = cblock->block;
7566 /* Traverse the FORALL body to check whether the following errors exist:
7567 1. For assignment, check if a many-to-one assignment happens.
7568 2. For WHERE statement, check the WHERE body to see if there is any
7569 many-to-one assignment. */
7572 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7576 c = code->block->next;
7582 case EXEC_POINTER_ASSIGN:
7583 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7586 case EXEC_ASSIGN_CALL:
7590 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7591 there is no need to handle it here. */
7595 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7600 /* The next statement in the FORALL body. */
7606 /* Counts the number of iterators needed inside a forall construct, including
7607 nested forall constructs. This is used to allocate the needed memory
7608 in gfc_resolve_forall. */
7611 gfc_count_forall_iterators (gfc_code *code)
7613 int max_iters, sub_iters, current_iters;
7614 gfc_forall_iterator *fa;
7616 gcc_assert(code->op == EXEC_FORALL);
7620 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7623 code = code->block->next;
7627 if (code->op == EXEC_FORALL)
7629 sub_iters = gfc_count_forall_iterators (code);
7630 if (sub_iters > max_iters)
7631 max_iters = sub_iters;
7636 return current_iters + max_iters;
7640 /* Given a FORALL construct, first resolve the FORALL iterator, then call
7641 gfc_resolve_forall_body to resolve the FORALL body. */
7644 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
7646 static gfc_expr **var_expr;
7647 static int total_var = 0;
7648 static int nvar = 0;
7650 gfc_forall_iterator *fa;
7655 /* Start to resolve a FORALL construct */
7656 if (forall_save == 0)
7658 /* Count the total number of FORALL index in the nested FORALL
7659 construct in order to allocate the VAR_EXPR with proper size. */
7660 total_var = gfc_count_forall_iterators (code);
7662 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
7663 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
7666 /* The information about FORALL iterator, including FORALL index start, end
7667 and stride. The FORALL index can not appear in start, end or stride. */
7668 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7670 /* Check if any outer FORALL index name is the same as the current
7672 for (i = 0; i < nvar; i++)
7674 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
7676 gfc_error ("An outer FORALL construct already has an index "
7677 "with this name %L", &fa->var->where);
7681 /* Record the current FORALL index. */
7682 var_expr[nvar] = gfc_copy_expr (fa->var);
7686 /* No memory leak. */
7687 gcc_assert (nvar <= total_var);
7690 /* Resolve the FORALL body. */
7691 gfc_resolve_forall_body (code, nvar, var_expr);
7693 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
7694 gfc_resolve_blocks (code->block, ns);
7698 /* Free only the VAR_EXPRs allocated in this frame. */
7699 for (i = nvar; i < tmp; i++)
7700 gfc_free_expr (var_expr[i]);
7704 /* We are in the outermost FORALL construct. */
7705 gcc_assert (forall_save == 0);
7707 /* VAR_EXPR is not needed any more. */
7708 gfc_free (var_expr);
7714 /* Resolve a BLOCK construct statement. */
7717 resolve_block_construct (gfc_code* code)
7719 /* Eventually, we may want to do some checks here or handle special stuff.
7720 But so far the only thing we can do is resolving the local namespace. */
7722 gfc_resolve (code->ext.ns);
7726 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
7729 static void resolve_code (gfc_code *, gfc_namespace *);
7732 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
7736 for (; b; b = b->block)
7738 t = gfc_resolve_expr (b->expr1);
7739 if (gfc_resolve_expr (b->expr2) == FAILURE)
7745 if (t == SUCCESS && b->expr1 != NULL
7746 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
7747 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7754 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
7755 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
7760 resolve_branch (b->label1, b);
7764 resolve_block_construct (b);
7768 case EXEC_SELECT_TYPE:
7778 case EXEC_OMP_ATOMIC:
7779 case EXEC_OMP_CRITICAL:
7781 case EXEC_OMP_MASTER:
7782 case EXEC_OMP_ORDERED:
7783 case EXEC_OMP_PARALLEL:
7784 case EXEC_OMP_PARALLEL_DO:
7785 case EXEC_OMP_PARALLEL_SECTIONS:
7786 case EXEC_OMP_PARALLEL_WORKSHARE:
7787 case EXEC_OMP_SECTIONS:
7788 case EXEC_OMP_SINGLE:
7790 case EXEC_OMP_TASKWAIT:
7791 case EXEC_OMP_WORKSHARE:
7795 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
7798 resolve_code (b->next, ns);
7803 /* Does everything to resolve an ordinary assignment. Returns true
7804 if this is an interface assignment. */
7806 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
7816 if (gfc_extend_assign (code, ns) == SUCCESS)
7820 if (code->op == EXEC_ASSIGN_CALL)
7822 lhs = code->ext.actual->expr;
7823 rhsptr = &code->ext.actual->next->expr;
7827 gfc_actual_arglist* args;
7828 gfc_typebound_proc* tbp;
7830 gcc_assert (code->op == EXEC_COMPCALL);
7832 args = code->expr1->value.compcall.actual;
7834 rhsptr = &args->next->expr;
7836 tbp = code->expr1->value.compcall.tbp;
7837 gcc_assert (!tbp->is_generic);
7840 /* Make a temporary rhs when there is a default initializer
7841 and rhs is the same symbol as the lhs. */
7842 if ((*rhsptr)->expr_type == EXPR_VARIABLE
7843 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
7844 && has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
7845 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
7846 *rhsptr = gfc_get_parentheses (*rhsptr);
7855 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
7856 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
7857 &code->loc) == FAILURE)
7860 /* Handle the case of a BOZ literal on the RHS. */
7861 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
7864 if (gfc_option.warn_surprising)
7865 gfc_warning ("BOZ literal at %L is bitwise transferred "
7866 "non-integer symbol '%s'", &code->loc,
7867 lhs->symtree->n.sym->name);
7869 if (!gfc_convert_boz (rhs, &lhs->ts))
7871 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
7873 if (rc == ARITH_UNDERFLOW)
7874 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
7875 ". This check can be disabled with the option "
7876 "-fno-range-check", &rhs->where);
7877 else if (rc == ARITH_OVERFLOW)
7878 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
7879 ". This check can be disabled with the option "
7880 "-fno-range-check", &rhs->where);
7881 else if (rc == ARITH_NAN)
7882 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
7883 ". This check can be disabled with the option "
7884 "-fno-range-check", &rhs->where);
7890 if (lhs->ts.type == BT_CHARACTER
7891 && gfc_option.warn_character_truncation)
7893 if (lhs->ts.u.cl != NULL
7894 && lhs->ts.u.cl->length != NULL
7895 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7896 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
7898 if (rhs->expr_type == EXPR_CONSTANT)
7899 rlen = rhs->value.character.length;
7901 else if (rhs->ts.u.cl != NULL
7902 && rhs->ts.u.cl->length != NULL
7903 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7904 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
7906 if (rlen && llen && rlen > llen)
7907 gfc_warning_now ("CHARACTER expression will be truncated "
7908 "in assignment (%d/%d) at %L",
7909 llen, rlen, &code->loc);
7912 /* Ensure that a vector index expression for the lvalue is evaluated
7913 to a temporary if the lvalue symbol is referenced in it. */
7916 for (ref = lhs->ref; ref; ref= ref->next)
7917 if (ref->type == REF_ARRAY)
7919 for (n = 0; n < ref->u.ar.dimen; n++)
7920 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
7921 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
7922 ref->u.ar.start[n]))
7924 = gfc_get_parentheses (ref->u.ar.start[n]);
7928 if (gfc_pure (NULL))
7930 if (gfc_impure_variable (lhs->symtree->n.sym))
7932 gfc_error ("Cannot assign to variable '%s' in PURE "
7934 lhs->symtree->n.sym->name,
7939 if (lhs->ts.type == BT_DERIVED
7940 && lhs->expr_type == EXPR_VARIABLE
7941 && lhs->ts.u.derived->attr.pointer_comp
7942 && gfc_impure_variable (rhs->symtree->n.sym))
7944 gfc_error ("The impure variable at %L is assigned to "
7945 "a derived type variable with a POINTER "
7946 "component in a PURE procedure (12.6)",
7953 if (lhs->ts.type == BT_CLASS)
7955 gfc_error ("Variable must not be polymorphic in assignment at %L",
7960 gfc_check_assign (lhs, rhs, 1);
7965 /* Given a block of code, recursively resolve everything pointed to by this
7969 resolve_code (gfc_code *code, gfc_namespace *ns)
7971 int omp_workshare_save;
7976 frame.prev = cs_base;
7980 find_reachable_labels (code);
7982 for (; code; code = code->next)
7984 frame.current = code;
7985 forall_save = forall_flag;
7987 if (code->op == EXEC_FORALL)
7990 gfc_resolve_forall (code, ns, forall_save);
7993 else if (code->block)
7995 omp_workshare_save = -1;
7998 case EXEC_OMP_PARALLEL_WORKSHARE:
7999 omp_workshare_save = omp_workshare_flag;
8000 omp_workshare_flag = 1;
8001 gfc_resolve_omp_parallel_blocks (code, ns);
8003 case EXEC_OMP_PARALLEL:
8004 case EXEC_OMP_PARALLEL_DO:
8005 case EXEC_OMP_PARALLEL_SECTIONS:
8007 omp_workshare_save = omp_workshare_flag;
8008 omp_workshare_flag = 0;
8009 gfc_resolve_omp_parallel_blocks (code, ns);
8012 gfc_resolve_omp_do_blocks (code, ns);
8014 case EXEC_SELECT_TYPE:
8015 gfc_current_ns = code->ext.ns;
8016 gfc_resolve_blocks (code->block, gfc_current_ns);
8017 gfc_current_ns = ns;
8019 case EXEC_OMP_WORKSHARE:
8020 omp_workshare_save = omp_workshare_flag;
8021 omp_workshare_flag = 1;
8024 gfc_resolve_blocks (code->block, ns);
8028 if (omp_workshare_save != -1)
8029 omp_workshare_flag = omp_workshare_save;
8033 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
8034 t = gfc_resolve_expr (code->expr1);
8035 forall_flag = forall_save;
8037 if (gfc_resolve_expr (code->expr2) == FAILURE)
8040 if (code->op == EXEC_ALLOCATE
8041 && gfc_resolve_expr (code->expr3) == FAILURE)
8047 case EXEC_END_BLOCK:
8054 case EXEC_ASSIGN_CALL:
8058 /* Keep track of which entry we are up to. */
8059 current_entry_id = code->ext.entry->id;
8063 resolve_where (code, NULL);
8067 if (code->expr1 != NULL)
8069 if (code->expr1->ts.type != BT_INTEGER)
8070 gfc_error ("ASSIGNED GOTO statement at %L requires an "
8071 "INTEGER variable", &code->expr1->where);
8072 else if (code->expr1->symtree->n.sym->attr.assign != 1)
8073 gfc_error ("Variable '%s' has not been assigned a target "
8074 "label at %L", code->expr1->symtree->n.sym->name,
8075 &code->expr1->where);
8078 resolve_branch (code->label1, code);
8082 if (code->expr1 != NULL
8083 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
8084 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
8085 "INTEGER return specifier", &code->expr1->where);
8088 case EXEC_INIT_ASSIGN:
8089 case EXEC_END_PROCEDURE:
8096 if (resolve_ordinary_assign (code, ns))
8098 if (code->op == EXEC_COMPCALL)
8105 case EXEC_LABEL_ASSIGN:
8106 if (code->label1->defined == ST_LABEL_UNKNOWN)
8107 gfc_error ("Label %d referenced at %L is never defined",
8108 code->label1->value, &code->label1->where);
8110 && (code->expr1->expr_type != EXPR_VARIABLE
8111 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
8112 || code->expr1->symtree->n.sym->ts.kind
8113 != gfc_default_integer_kind
8114 || code->expr1->symtree->n.sym->as != NULL))
8115 gfc_error ("ASSIGN statement at %L requires a scalar "
8116 "default INTEGER variable", &code->expr1->where);
8119 case EXEC_POINTER_ASSIGN:
8123 gfc_check_pointer_assign (code->expr1, code->expr2);
8126 case EXEC_ARITHMETIC_IF:
8128 && code->expr1->ts.type != BT_INTEGER
8129 && code->expr1->ts.type != BT_REAL)
8130 gfc_error ("Arithmetic IF statement at %L requires a numeric "
8131 "expression", &code->expr1->where);
8133 resolve_branch (code->label1, code);
8134 resolve_branch (code->label2, code);
8135 resolve_branch (code->label3, code);
8139 if (t == SUCCESS && code->expr1 != NULL
8140 && (code->expr1->ts.type != BT_LOGICAL
8141 || code->expr1->rank != 0))
8142 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8143 &code->expr1->where);
8148 resolve_call (code);
8153 if (code->expr1->symtree
8154 && code->expr1->symtree->n.sym->ts.type == BT_CLASS)
8155 resolve_class_typebound_call (code);
8157 resolve_typebound_call (code);
8161 resolve_ppc_call (code);
8165 /* Select is complicated. Also, a SELECT construct could be
8166 a transformed computed GOTO. */
8167 resolve_select (code);
8170 case EXEC_SELECT_TYPE:
8171 resolve_select_type (code);
8175 gfc_resolve (code->ext.ns);
8179 if (code->ext.iterator != NULL)
8181 gfc_iterator *iter = code->ext.iterator;
8182 if (gfc_resolve_iterator (iter, true) != FAILURE)
8183 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
8188 if (code->expr1 == NULL)
8189 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
8191 && (code->expr1->rank != 0
8192 || code->expr1->ts.type != BT_LOGICAL))
8193 gfc_error ("Exit condition of DO WHILE loop at %L must be "
8194 "a scalar LOGICAL expression", &code->expr1->where);
8199 resolve_allocate_deallocate (code, "ALLOCATE");
8203 case EXEC_DEALLOCATE:
8205 resolve_allocate_deallocate (code, "DEALLOCATE");
8210 if (gfc_resolve_open (code->ext.open) == FAILURE)
8213 resolve_branch (code->ext.open->err, code);
8217 if (gfc_resolve_close (code->ext.close) == FAILURE)
8220 resolve_branch (code->ext.close->err, code);
8223 case EXEC_BACKSPACE:
8227 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8230 resolve_branch (code->ext.filepos->err, code);
8234 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8237 resolve_branch (code->ext.inquire->err, code);
8241 gcc_assert (code->ext.inquire != NULL);
8242 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8245 resolve_branch (code->ext.inquire->err, code);
8249 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8252 resolve_branch (code->ext.wait->err, code);
8253 resolve_branch (code->ext.wait->end, code);
8254 resolve_branch (code->ext.wait->eor, code);
8259 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8262 resolve_branch (code->ext.dt->err, code);
8263 resolve_branch (code->ext.dt->end, code);
8264 resolve_branch (code->ext.dt->eor, code);
8268 resolve_transfer (code);
8272 resolve_forall_iterators (code->ext.forall_iterator);
8274 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8275 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8276 "expression", &code->expr1->where);
8279 case EXEC_OMP_ATOMIC:
8280 case EXEC_OMP_BARRIER:
8281 case EXEC_OMP_CRITICAL:
8282 case EXEC_OMP_FLUSH:
8284 case EXEC_OMP_MASTER:
8285 case EXEC_OMP_ORDERED:
8286 case EXEC_OMP_SECTIONS:
8287 case EXEC_OMP_SINGLE:
8288 case EXEC_OMP_TASKWAIT:
8289 case EXEC_OMP_WORKSHARE:
8290 gfc_resolve_omp_directive (code, ns);
8293 case EXEC_OMP_PARALLEL:
8294 case EXEC_OMP_PARALLEL_DO:
8295 case EXEC_OMP_PARALLEL_SECTIONS:
8296 case EXEC_OMP_PARALLEL_WORKSHARE:
8298 omp_workshare_save = omp_workshare_flag;
8299 omp_workshare_flag = 0;
8300 gfc_resolve_omp_directive (code, ns);
8301 omp_workshare_flag = omp_workshare_save;
8305 gfc_internal_error ("resolve_code(): Bad statement code");
8309 cs_base = frame.prev;
8313 /* Resolve initial values and make sure they are compatible with
8317 resolve_values (gfc_symbol *sym)
8319 if (sym->value == NULL)
8322 if (gfc_resolve_expr (sym->value) == FAILURE)
8325 gfc_check_assign_symbol (sym, sym->value);
8329 /* Verify the binding labels for common blocks that are BIND(C). The label
8330 for a BIND(C) common block must be identical in all scoping units in which
8331 the common block is declared. Further, the binding label can not collide
8332 with any other global entity in the program. */
8335 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8337 if (comm_block_tree->n.common->is_bind_c == 1)
8339 gfc_gsymbol *binding_label_gsym;
8340 gfc_gsymbol *comm_name_gsym;
8342 /* See if a global symbol exists by the common block's name. It may
8343 be NULL if the common block is use-associated. */
8344 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8345 comm_block_tree->n.common->name);
8346 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8347 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8348 "with the global entity '%s' at %L",
8349 comm_block_tree->n.common->binding_label,
8350 comm_block_tree->n.common->name,
8351 &(comm_block_tree->n.common->where),
8352 comm_name_gsym->name, &(comm_name_gsym->where));
8353 else if (comm_name_gsym != NULL
8354 && strcmp (comm_name_gsym->name,
8355 comm_block_tree->n.common->name) == 0)
8357 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8359 if (comm_name_gsym->binding_label == NULL)
8360 /* No binding label for common block stored yet; save this one. */
8361 comm_name_gsym->binding_label =
8362 comm_block_tree->n.common->binding_label;
8364 if (strcmp (comm_name_gsym->binding_label,
8365 comm_block_tree->n.common->binding_label) != 0)
8367 /* Common block names match but binding labels do not. */
8368 gfc_error ("Binding label '%s' for common block '%s' at %L "
8369 "does not match the binding label '%s' for common "
8371 comm_block_tree->n.common->binding_label,
8372 comm_block_tree->n.common->name,
8373 &(comm_block_tree->n.common->where),
8374 comm_name_gsym->binding_label,
8375 comm_name_gsym->name,
8376 &(comm_name_gsym->where));
8381 /* There is no binding label (NAME="") so we have nothing further to
8382 check and nothing to add as a global symbol for the label. */
8383 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8386 binding_label_gsym =
8387 gfc_find_gsymbol (gfc_gsym_root,
8388 comm_block_tree->n.common->binding_label);
8389 if (binding_label_gsym == NULL)
8391 /* Need to make a global symbol for the binding label to prevent
8392 it from colliding with another. */
8393 binding_label_gsym =
8394 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8395 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8396 binding_label_gsym->type = GSYM_COMMON;
8400 /* If comm_name_gsym is NULL, the name common block is use
8401 associated and the name could be colliding. */
8402 if (binding_label_gsym->type != GSYM_COMMON)
8403 gfc_error ("Binding label '%s' for common block '%s' at %L "
8404 "collides with the global entity '%s' at %L",
8405 comm_block_tree->n.common->binding_label,
8406 comm_block_tree->n.common->name,
8407 &(comm_block_tree->n.common->where),
8408 binding_label_gsym->name,
8409 &(binding_label_gsym->where));
8410 else if (comm_name_gsym != NULL
8411 && (strcmp (binding_label_gsym->name,
8412 comm_name_gsym->binding_label) != 0)
8413 && (strcmp (binding_label_gsym->sym_name,
8414 comm_name_gsym->name) != 0))
8415 gfc_error ("Binding label '%s' for common block '%s' at %L "
8416 "collides with global entity '%s' at %L",
8417 binding_label_gsym->name, binding_label_gsym->sym_name,
8418 &(comm_block_tree->n.common->where),
8419 comm_name_gsym->name, &(comm_name_gsym->where));
8427 /* Verify any BIND(C) derived types in the namespace so we can report errors
8428 for them once, rather than for each variable declared of that type. */
8431 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8433 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8434 && derived_sym->attr.is_bind_c == 1)
8435 verify_bind_c_derived_type (derived_sym);
8441 /* Verify that any binding labels used in a given namespace do not collide
8442 with the names or binding labels of any global symbols. */
8445 gfc_verify_binding_labels (gfc_symbol *sym)
8449 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8450 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8452 gfc_gsymbol *bind_c_sym;
8454 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8455 if (bind_c_sym != NULL
8456 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8458 if (sym->attr.if_source == IFSRC_DECL
8459 && (bind_c_sym->type != GSYM_SUBROUTINE
8460 && bind_c_sym->type != GSYM_FUNCTION)
8461 && ((sym->attr.contained == 1
8462 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8463 || (sym->attr.use_assoc == 1
8464 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8466 /* Make sure global procedures don't collide with anything. */
8467 gfc_error ("Binding label '%s' at %L collides with the global "
8468 "entity '%s' at %L", sym->binding_label,
8469 &(sym->declared_at), bind_c_sym->name,
8470 &(bind_c_sym->where));
8473 else if (sym->attr.contained == 0
8474 && (sym->attr.if_source == IFSRC_IFBODY
8475 && sym->attr.flavor == FL_PROCEDURE)
8476 && (bind_c_sym->sym_name != NULL
8477 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8479 /* Make sure procedures in interface bodies don't collide. */
8480 gfc_error ("Binding label '%s' in interface body at %L collides "
8481 "with the global entity '%s' at %L",
8483 &(sym->declared_at), bind_c_sym->name,
8484 &(bind_c_sym->where));
8487 else if (sym->attr.contained == 0
8488 && sym->attr.if_source == IFSRC_UNKNOWN)
8489 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8490 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8491 || sym->attr.use_assoc == 0)
8493 gfc_error ("Binding label '%s' at %L collides with global "
8494 "entity '%s' at %L", sym->binding_label,
8495 &(sym->declared_at), bind_c_sym->name,
8496 &(bind_c_sym->where));
8501 /* Clear the binding label to prevent checking multiple times. */
8502 sym->binding_label[0] = '\0';
8504 else if (bind_c_sym == NULL)
8506 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8507 bind_c_sym->where = sym->declared_at;
8508 bind_c_sym->sym_name = sym->name;
8510 if (sym->attr.use_assoc == 1)
8511 bind_c_sym->mod_name = sym->module;
8513 if (sym->ns->proc_name != NULL)
8514 bind_c_sym->mod_name = sym->ns->proc_name->name;
8516 if (sym->attr.contained == 0)
8518 if (sym->attr.subroutine)
8519 bind_c_sym->type = GSYM_SUBROUTINE;
8520 else if (sym->attr.function)
8521 bind_c_sym->type = GSYM_FUNCTION;
8529 /* Resolve an index expression. */
8532 resolve_index_expr (gfc_expr *e)
8534 if (gfc_resolve_expr (e) == FAILURE)
8537 if (gfc_simplify_expr (e, 0) == FAILURE)
8540 if (gfc_specification_expr (e) == FAILURE)
8546 /* Resolve a charlen structure. */
8549 resolve_charlen (gfc_charlen *cl)
8558 specification_expr = 1;
8560 if (resolve_index_expr (cl->length) == FAILURE)
8562 specification_expr = 0;
8566 /* "If the character length parameter value evaluates to a negative
8567 value, the length of character entities declared is zero." */
8568 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8570 if (gfc_option.warn_surprising)
8571 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
8572 " the length has been set to zero",
8573 &cl->length->where, i);
8574 gfc_replace_expr (cl->length, gfc_int_expr (0));
8577 /* Check that the character length is not too large. */
8578 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8579 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8580 && cl->length->ts.type == BT_INTEGER
8581 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8583 gfc_error ("String length at %L is too large", &cl->length->where);
8591 /* Test for non-constant shape arrays. */
8594 is_non_constant_shape_array (gfc_symbol *sym)
8600 not_constant = false;
8601 if (sym->as != NULL)
8603 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
8604 has not been simplified; parameter array references. Do the
8605 simplification now. */
8606 for (i = 0; i < sym->as->rank; i++)
8608 e = sym->as->lower[i];
8609 if (e && (resolve_index_expr (e) == FAILURE
8610 || !gfc_is_constant_expr (e)))
8611 not_constant = true;
8613 e = sym->as->upper[i];
8614 if (e && (resolve_index_expr (e) == FAILURE
8615 || !gfc_is_constant_expr (e)))
8616 not_constant = true;
8619 return not_constant;
8622 /* Given a symbol and an initialization expression, add code to initialize
8623 the symbol to the function entry. */
8625 build_init_assign (gfc_symbol *sym, gfc_expr *init)
8629 gfc_namespace *ns = sym->ns;
8631 /* Search for the function namespace if this is a contained
8632 function without an explicit result. */
8633 if (sym->attr.function && sym == sym->result
8634 && sym->name != sym->ns->proc_name->name)
8637 for (;ns; ns = ns->sibling)
8638 if (strcmp (ns->proc_name->name, sym->name) == 0)
8644 gfc_free_expr (init);
8648 /* Build an l-value expression for the result. */
8649 lval = gfc_lval_expr_from_sym (sym);
8651 /* Add the code at scope entry. */
8652 init_st = gfc_get_code ();
8653 init_st->next = ns->code;
8656 /* Assign the default initializer to the l-value. */
8657 init_st->loc = sym->declared_at;
8658 init_st->op = EXEC_INIT_ASSIGN;
8659 init_st->expr1 = lval;
8660 init_st->expr2 = init;
8663 /* Assign the default initializer to a derived type variable or result. */
8666 apply_default_init (gfc_symbol *sym)
8668 gfc_expr *init = NULL;
8670 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8673 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
8674 init = gfc_default_initializer (&sym->ts);
8679 build_init_assign (sym, init);
8682 /* Build an initializer for a local integer, real, complex, logical, or
8683 character variable, based on the command line flags finit-local-zero,
8684 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
8685 null if the symbol should not have a default initialization. */
8687 build_default_init_expr (gfc_symbol *sym)
8690 gfc_expr *init_expr;
8693 /* These symbols should never have a default initialization. */
8694 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
8695 || sym->attr.external
8697 || sym->attr.pointer
8698 || sym->attr.in_equivalence
8699 || sym->attr.in_common
8702 || sym->attr.cray_pointee
8703 || sym->attr.cray_pointer)
8706 /* Now we'll try to build an initializer expression. */
8707 init_expr = gfc_get_expr ();
8708 init_expr->expr_type = EXPR_CONSTANT;
8709 init_expr->ts.type = sym->ts.type;
8710 init_expr->ts.kind = sym->ts.kind;
8711 init_expr->where = sym->declared_at;
8713 /* We will only initialize integers, reals, complex, logicals, and
8714 characters, and only if the corresponding command-line flags
8715 were set. Otherwise, we free init_expr and return null. */
8716 switch (sym->ts.type)
8719 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
8720 mpz_init_set_si (init_expr->value.integer,
8721 gfc_option.flag_init_integer_value);
8724 gfc_free_expr (init_expr);
8730 mpfr_init (init_expr->value.real);
8731 switch (gfc_option.flag_init_real)
8733 case GFC_INIT_REAL_SNAN:
8734 init_expr->is_snan = 1;
8736 case GFC_INIT_REAL_NAN:
8737 mpfr_set_nan (init_expr->value.real);
8740 case GFC_INIT_REAL_INF:
8741 mpfr_set_inf (init_expr->value.real, 1);
8744 case GFC_INIT_REAL_NEG_INF:
8745 mpfr_set_inf (init_expr->value.real, -1);
8748 case GFC_INIT_REAL_ZERO:
8749 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
8753 gfc_free_expr (init_expr);
8760 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
8761 switch (gfc_option.flag_init_real)
8763 case GFC_INIT_REAL_SNAN:
8764 init_expr->is_snan = 1;
8766 case GFC_INIT_REAL_NAN:
8767 mpfr_set_nan (mpc_realref (init_expr->value.complex));
8768 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
8771 case GFC_INIT_REAL_INF:
8772 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
8773 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
8776 case GFC_INIT_REAL_NEG_INF:
8777 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
8778 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
8781 case GFC_INIT_REAL_ZERO:
8782 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
8786 gfc_free_expr (init_expr);
8793 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
8794 init_expr->value.logical = 0;
8795 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
8796 init_expr->value.logical = 1;
8799 gfc_free_expr (init_expr);
8805 /* For characters, the length must be constant in order to
8806 create a default initializer. */
8807 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
8808 && sym->ts.u.cl->length
8809 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8811 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
8812 init_expr->value.character.length = char_len;
8813 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
8814 for (i = 0; i < char_len; i++)
8815 init_expr->value.character.string[i]
8816 = (unsigned char) gfc_option.flag_init_character_value;
8820 gfc_free_expr (init_expr);
8826 gfc_free_expr (init_expr);
8832 /* Add an initialization expression to a local variable. */
8834 apply_default_init_local (gfc_symbol *sym)
8836 gfc_expr *init = NULL;
8838 /* The symbol should be a variable or a function return value. */
8839 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8840 || (sym->attr.function && sym->result != sym))
8843 /* Try to build the initializer expression. If we can't initialize
8844 this symbol, then init will be NULL. */
8845 init = build_default_init_expr (sym);
8849 /* For saved variables, we don't want to add an initializer at
8850 function entry, so we just add a static initializer. */
8851 if (sym->attr.save || sym->ns->save_all
8852 || gfc_option.flag_max_stack_var_size == 0)
8854 /* Don't clobber an existing initializer! */
8855 gcc_assert (sym->value == NULL);
8860 build_init_assign (sym, init);
8863 /* Resolution of common features of flavors variable and procedure. */
8866 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
8868 /* Constraints on deferred shape variable. */
8869 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
8871 if (sym->attr.allocatable)
8873 if (sym->attr.dimension)
8875 gfc_error ("Allocatable array '%s' at %L must have "
8876 "a deferred shape", sym->name, &sym->declared_at);
8879 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
8880 "may not be ALLOCATABLE", sym->name,
8881 &sym->declared_at) == FAILURE)
8885 if (sym->attr.pointer && sym->attr.dimension)
8887 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
8888 sym->name, &sym->declared_at);
8895 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
8896 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
8898 gfc_error ("Array '%s' at %L cannot have a deferred shape",
8899 sym->name, &sym->declared_at);
8907 /* Additional checks for symbols with flavor variable and derived
8908 type. To be called from resolve_fl_variable. */
8911 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
8913 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
8915 /* Check to see if a derived type is blocked from being host
8916 associated by the presence of another class I symbol in the same
8917 namespace. 14.6.1.3 of the standard and the discussion on
8918 comp.lang.fortran. */
8919 if (sym->ns != sym->ts.u.derived->ns
8920 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
8923 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
8924 if (s && s->attr.flavor != FL_DERIVED)
8926 gfc_error ("The type '%s' cannot be host associated at %L "
8927 "because it is blocked by an incompatible object "
8928 "of the same name declared at %L",
8929 sym->ts.u.derived->name, &sym->declared_at,
8935 /* 4th constraint in section 11.3: "If an object of a type for which
8936 component-initialization is specified (R429) appears in the
8937 specification-part of a module and does not have the ALLOCATABLE
8938 or POINTER attribute, the object shall have the SAVE attribute."
8940 The check for initializers is performed with
8941 has_default_initializer because gfc_default_initializer generates
8942 a hidden default for allocatable components. */
8943 if (!(sym->value || no_init_flag) && sym->ns->proc_name
8944 && sym->ns->proc_name->attr.flavor == FL_MODULE
8945 && !sym->ns->save_all && !sym->attr.save
8946 && !sym->attr.pointer && !sym->attr.allocatable
8947 && has_default_initializer (sym->ts.u.derived)
8948 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
8949 "module variable '%s' at %L, needed due to "
8950 "the default initialization", sym->name,
8951 &sym->declared_at) == FAILURE)
8954 if (sym->ts.type == BT_CLASS)
8957 if (!gfc_type_is_extensible (sym->ts.u.derived->components->ts.u.derived))
8959 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
8960 sym->ts.u.derived->components->ts.u.derived->name,
8961 sym->name, &sym->declared_at);
8966 /* Assume that use associated symbols were checked in the module ns. */
8967 if (!sym->attr.class_ok && !sym->attr.use_assoc)
8969 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
8970 "or pointer", sym->name, &sym->declared_at);
8975 /* Assign default initializer. */
8976 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
8977 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
8979 sym->value = gfc_default_initializer (&sym->ts);
8986 /* Resolve symbols with flavor variable. */
8989 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
8991 int no_init_flag, automatic_flag;
8993 const char *auto_save_msg;
8995 auto_save_msg = "Automatic object '%s' at %L cannot have the "
8998 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9001 /* Set this flag to check that variables are parameters of all entries.
9002 This check is effected by the call to gfc_resolve_expr through
9003 is_non_constant_shape_array. */
9004 specification_expr = 1;
9006 if (sym->ns->proc_name
9007 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9008 || sym->ns->proc_name->attr.is_main_program)
9009 && !sym->attr.use_assoc
9010 && !sym->attr.allocatable
9011 && !sym->attr.pointer
9012 && is_non_constant_shape_array (sym))
9014 /* The shape of a main program or module array needs to be
9016 gfc_error ("The module or main program array '%s' at %L must "
9017 "have constant shape", sym->name, &sym->declared_at);
9018 specification_expr = 0;
9022 if (sym->ts.type == BT_CHARACTER)
9024 /* Make sure that character string variables with assumed length are
9026 e = sym->ts.u.cl->length;
9027 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
9029 gfc_error ("Entity with assumed character length at %L must be a "
9030 "dummy argument or a PARAMETER", &sym->declared_at);
9034 if (e && sym->attr.save && !gfc_is_constant_expr (e))
9036 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9040 if (!gfc_is_constant_expr (e)
9041 && !(e->expr_type == EXPR_VARIABLE
9042 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
9043 && sym->ns->proc_name
9044 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9045 || sym->ns->proc_name->attr.is_main_program)
9046 && !sym->attr.use_assoc)
9048 gfc_error ("'%s' at %L must have constant character length "
9049 "in this context", sym->name, &sym->declared_at);
9054 if (sym->value == NULL && sym->attr.referenced)
9055 apply_default_init_local (sym); /* Try to apply a default initialization. */
9057 /* Determine if the symbol may not have an initializer. */
9058 no_init_flag = automatic_flag = 0;
9059 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
9060 || sym->attr.intrinsic || sym->attr.result)
9062 else if (sym->attr.dimension && !sym->attr.pointer
9063 && is_non_constant_shape_array (sym))
9065 no_init_flag = automatic_flag = 1;
9067 /* Also, they must not have the SAVE attribute.
9068 SAVE_IMPLICIT is checked below. */
9069 if (sym->attr.save == SAVE_EXPLICIT)
9071 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9076 /* Ensure that any initializer is simplified. */
9078 gfc_simplify_expr (sym->value, 1);
9080 /* Reject illegal initializers. */
9081 if (!sym->mark && sym->value)
9083 if (sym->attr.allocatable)
9084 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
9085 sym->name, &sym->declared_at);
9086 else if (sym->attr.external)
9087 gfc_error ("External '%s' at %L cannot have an initializer",
9088 sym->name, &sym->declared_at);
9089 else if (sym->attr.dummy
9090 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
9091 gfc_error ("Dummy '%s' at %L cannot have an initializer",
9092 sym->name, &sym->declared_at);
9093 else if (sym->attr.intrinsic)
9094 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
9095 sym->name, &sym->declared_at);
9096 else if (sym->attr.result)
9097 gfc_error ("Function result '%s' at %L cannot have an initializer",
9098 sym->name, &sym->declared_at);
9099 else if (automatic_flag)
9100 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
9101 sym->name, &sym->declared_at);
9108 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
9109 return resolve_fl_variable_derived (sym, no_init_flag);
9115 /* Resolve a procedure. */
9118 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
9120 gfc_formal_arglist *arg;
9122 if (sym->attr.function
9123 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9126 if (sym->ts.type == BT_CHARACTER)
9128 gfc_charlen *cl = sym->ts.u.cl;
9130 if (cl && cl->length && gfc_is_constant_expr (cl->length)
9131 && resolve_charlen (cl) == FAILURE)
9134 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9135 && sym->attr.proc == PROC_ST_FUNCTION)
9137 gfc_error ("Character-valued statement function '%s' at %L must "
9138 "have constant length", sym->name, &sym->declared_at);
9143 /* Ensure that derived type for are not of a private type. Internal
9144 module procedures are excluded by 2.2.3.3 - i.e., they are not
9145 externally accessible and can access all the objects accessible in
9147 if (!(sym->ns->parent
9148 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
9149 && gfc_check_access(sym->attr.access, sym->ns->default_access))
9151 gfc_interface *iface;
9153 for (arg = sym->formal; arg; arg = arg->next)
9156 && arg->sym->ts.type == BT_DERIVED
9157 && !arg->sym->ts.u.derived->attr.use_assoc
9158 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9159 arg->sym->ts.u.derived->ns->default_access)
9160 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
9161 "PRIVATE type and cannot be a dummy argument"
9162 " of '%s', which is PUBLIC at %L",
9163 arg->sym->name, sym->name, &sym->declared_at)
9166 /* Stop this message from recurring. */
9167 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9172 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9173 PRIVATE to the containing module. */
9174 for (iface = sym->generic; iface; iface = iface->next)
9176 for (arg = iface->sym->formal; arg; arg = arg->next)
9179 && arg->sym->ts.type == BT_DERIVED
9180 && !arg->sym->ts.u.derived->attr.use_assoc
9181 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9182 arg->sym->ts.u.derived->ns->default_access)
9183 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9184 "'%s' in PUBLIC interface '%s' at %L "
9185 "takes dummy arguments of '%s' which is "
9186 "PRIVATE", iface->sym->name, sym->name,
9187 &iface->sym->declared_at,
9188 gfc_typename (&arg->sym->ts)) == FAILURE)
9190 /* Stop this message from recurring. */
9191 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9197 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9198 PRIVATE to the containing module. */
9199 for (iface = sym->generic; iface; iface = iface->next)
9201 for (arg = iface->sym->formal; arg; arg = arg->next)
9204 && arg->sym->ts.type == BT_DERIVED
9205 && !arg->sym->ts.u.derived->attr.use_assoc
9206 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9207 arg->sym->ts.u.derived->ns->default_access)
9208 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9209 "'%s' in PUBLIC interface '%s' at %L "
9210 "takes dummy arguments of '%s' which is "
9211 "PRIVATE", iface->sym->name, sym->name,
9212 &iface->sym->declared_at,
9213 gfc_typename (&arg->sym->ts)) == FAILURE)
9215 /* Stop this message from recurring. */
9216 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9223 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9224 && !sym->attr.proc_pointer)
9226 gfc_error ("Function '%s' at %L cannot have an initializer",
9227 sym->name, &sym->declared_at);
9231 /* An external symbol may not have an initializer because it is taken to be
9232 a procedure. Exception: Procedure Pointers. */
9233 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9235 gfc_error ("External object '%s' at %L may not have an initializer",
9236 sym->name, &sym->declared_at);
9240 /* An elemental function is required to return a scalar 12.7.1 */
9241 if (sym->attr.elemental && sym->attr.function && sym->as)
9243 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9244 "result", sym->name, &sym->declared_at);
9245 /* Reset so that the error only occurs once. */
9246 sym->attr.elemental = 0;
9250 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9251 char-len-param shall not be array-valued, pointer-valued, recursive
9252 or pure. ....snip... A character value of * may only be used in the
9253 following ways: (i) Dummy arg of procedure - dummy associates with
9254 actual length; (ii) To declare a named constant; or (iii) External
9255 function - but length must be declared in calling scoping unit. */
9256 if (sym->attr.function
9257 && sym->ts.type == BT_CHARACTER
9258 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9260 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9261 || (sym->attr.recursive) || (sym->attr.pure))
9263 if (sym->as && sym->as->rank)
9264 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9265 "array-valued", sym->name, &sym->declared_at);
9267 if (sym->attr.pointer)
9268 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9269 "pointer-valued", sym->name, &sym->declared_at);
9272 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9273 "pure", sym->name, &sym->declared_at);
9275 if (sym->attr.recursive)
9276 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9277 "recursive", sym->name, &sym->declared_at);
9282 /* Appendix B.2 of the standard. Contained functions give an
9283 error anyway. Fixed-form is likely to be F77/legacy. */
9284 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9285 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9286 "CHARACTER(*) function '%s' at %L",
9287 sym->name, &sym->declared_at);
9290 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9292 gfc_formal_arglist *curr_arg;
9293 int has_non_interop_arg = 0;
9295 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9296 sym->common_block) == FAILURE)
9298 /* Clear these to prevent looking at them again if there was an
9300 sym->attr.is_bind_c = 0;
9301 sym->attr.is_c_interop = 0;
9302 sym->ts.is_c_interop = 0;
9306 /* So far, no errors have been found. */
9307 sym->attr.is_c_interop = 1;
9308 sym->ts.is_c_interop = 1;
9311 curr_arg = sym->formal;
9312 while (curr_arg != NULL)
9314 /* Skip implicitly typed dummy args here. */
9315 if (curr_arg->sym->attr.implicit_type == 0)
9316 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9317 /* If something is found to fail, record the fact so we
9318 can mark the symbol for the procedure as not being
9319 BIND(C) to try and prevent multiple errors being
9321 has_non_interop_arg = 1;
9323 curr_arg = curr_arg->next;
9326 /* See if any of the arguments were not interoperable and if so, clear
9327 the procedure symbol to prevent duplicate error messages. */
9328 if (has_non_interop_arg != 0)
9330 sym->attr.is_c_interop = 0;
9331 sym->ts.is_c_interop = 0;
9332 sym->attr.is_bind_c = 0;
9336 if (!sym->attr.proc_pointer)
9338 if (sym->attr.save == SAVE_EXPLICIT)
9340 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9341 "in '%s' at %L", sym->name, &sym->declared_at);
9344 if (sym->attr.intent)
9346 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9347 "in '%s' at %L", sym->name, &sym->declared_at);
9350 if (sym->attr.subroutine && sym->attr.result)
9352 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9353 "in '%s' at %L", sym->name, &sym->declared_at);
9356 if (sym->attr.external && sym->attr.function
9357 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9358 || sym->attr.contained))
9360 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9361 "in '%s' at %L", sym->name, &sym->declared_at);
9364 if (strcmp ("ppr@", sym->name) == 0)
9366 gfc_error ("Procedure pointer result '%s' at %L "
9367 "is missing the pointer attribute",
9368 sym->ns->proc_name->name, &sym->declared_at);
9377 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9378 been defined and we now know their defined arguments, check that they fulfill
9379 the requirements of the standard for procedures used as finalizers. */
9382 gfc_resolve_finalizers (gfc_symbol* derived)
9384 gfc_finalizer* list;
9385 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9386 gfc_try result = SUCCESS;
9387 bool seen_scalar = false;
9389 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9392 /* Walk over the list of finalizer-procedures, check them, and if any one
9393 does not fit in with the standard's definition, print an error and remove
9394 it from the list. */
9395 prev_link = &derived->f2k_derived->finalizers;
9396 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9402 /* Skip this finalizer if we already resolved it. */
9403 if (list->proc_tree)
9405 prev_link = &(list->next);
9409 /* Check this exists and is a SUBROUTINE. */
9410 if (!list->proc_sym->attr.subroutine)
9412 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9413 list->proc_sym->name, &list->where);
9417 /* We should have exactly one argument. */
9418 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9420 gfc_error ("FINAL procedure at %L must have exactly one argument",
9424 arg = list->proc_sym->formal->sym;
9426 /* This argument must be of our type. */
9427 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9429 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9430 &arg->declared_at, derived->name);
9434 /* It must neither be a pointer nor allocatable nor optional. */
9435 if (arg->attr.pointer)
9437 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9441 if (arg->attr.allocatable)
9443 gfc_error ("Argument of FINAL procedure at %L must not be"
9444 " ALLOCATABLE", &arg->declared_at);
9447 if (arg->attr.optional)
9449 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9454 /* It must not be INTENT(OUT). */
9455 if (arg->attr.intent == INTENT_OUT)
9457 gfc_error ("Argument of FINAL procedure at %L must not be"
9458 " INTENT(OUT)", &arg->declared_at);
9462 /* Warn if the procedure is non-scalar and not assumed shape. */
9463 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9464 && arg->as->type != AS_ASSUMED_SHAPE)
9465 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9466 " shape argument", &arg->declared_at);
9468 /* Check that it does not match in kind and rank with a FINAL procedure
9469 defined earlier. To really loop over the *earlier* declarations,
9470 we need to walk the tail of the list as new ones were pushed at the
9472 /* TODO: Handle kind parameters once they are implemented. */
9473 my_rank = (arg->as ? arg->as->rank : 0);
9474 for (i = list->next; i; i = i->next)
9476 /* Argument list might be empty; that is an error signalled earlier,
9477 but we nevertheless continued resolving. */
9478 if (i->proc_sym->formal)
9480 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9481 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9482 if (i_rank == my_rank)
9484 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9485 " rank (%d) as '%s'",
9486 list->proc_sym->name, &list->where, my_rank,
9493 /* Is this the/a scalar finalizer procedure? */
9494 if (!arg->as || arg->as->rank == 0)
9497 /* Find the symtree for this procedure. */
9498 gcc_assert (!list->proc_tree);
9499 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9501 prev_link = &list->next;
9504 /* Remove wrong nodes immediately from the list so we don't risk any
9505 troubles in the future when they might fail later expectations. */
9509 *prev_link = list->next;
9510 gfc_free_finalizer (i);
9513 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9514 were nodes in the list, must have been for arrays. It is surely a good
9515 idea to have a scalar version there if there's something to finalize. */
9516 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9517 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9518 " defined at %L, suggest also scalar one",
9519 derived->name, &derived->declared_at);
9521 /* TODO: Remove this error when finalization is finished. */
9522 gfc_error ("Finalization at %L is not yet implemented",
9523 &derived->declared_at);
9529 /* Check that it is ok for the typebound procedure proc to override the
9533 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9536 const gfc_symbol* proc_target;
9537 const gfc_symbol* old_target;
9538 unsigned proc_pass_arg, old_pass_arg, argpos;
9539 gfc_formal_arglist* proc_formal;
9540 gfc_formal_arglist* old_formal;
9542 /* This procedure should only be called for non-GENERIC proc. */
9543 gcc_assert (!proc->n.tb->is_generic);
9545 /* If the overwritten procedure is GENERIC, this is an error. */
9546 if (old->n.tb->is_generic)
9548 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9549 old->name, &proc->n.tb->where);
9553 where = proc->n.tb->where;
9554 proc_target = proc->n.tb->u.specific->n.sym;
9555 old_target = old->n.tb->u.specific->n.sym;
9557 /* Check that overridden binding is not NON_OVERRIDABLE. */
9558 if (old->n.tb->non_overridable)
9560 gfc_error ("'%s' at %L overrides a procedure binding declared"
9561 " NON_OVERRIDABLE", proc->name, &where);
9565 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9566 if (!old->n.tb->deferred && proc->n.tb->deferred)
9568 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9569 " non-DEFERRED binding", proc->name, &where);
9573 /* If the overridden binding is PURE, the overriding must be, too. */
9574 if (old_target->attr.pure && !proc_target->attr.pure)
9576 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9577 proc->name, &where);
9581 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9582 is not, the overriding must not be either. */
9583 if (old_target->attr.elemental && !proc_target->attr.elemental)
9585 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
9586 " ELEMENTAL", proc->name, &where);
9589 if (!old_target->attr.elemental && proc_target->attr.elemental)
9591 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
9592 " be ELEMENTAL, either", proc->name, &where);
9596 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
9598 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
9600 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
9601 " SUBROUTINE", proc->name, &where);
9605 /* If the overridden binding is a FUNCTION, the overriding must also be a
9606 FUNCTION and have the same characteristics. */
9607 if (old_target->attr.function)
9609 if (!proc_target->attr.function)
9611 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
9612 " FUNCTION", proc->name, &where);
9616 /* FIXME: Do more comprehensive checking (including, for instance, the
9617 rank and array-shape). */
9618 gcc_assert (proc_target->result && old_target->result);
9619 if (!gfc_compare_types (&proc_target->result->ts,
9620 &old_target->result->ts))
9622 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
9623 " matching result types", proc->name, &where);
9628 /* If the overridden binding is PUBLIC, the overriding one must not be
9630 if (old->n.tb->access == ACCESS_PUBLIC
9631 && proc->n.tb->access == ACCESS_PRIVATE)
9633 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
9634 " PRIVATE", proc->name, &where);
9638 /* Compare the formal argument lists of both procedures. This is also abused
9639 to find the position of the passed-object dummy arguments of both
9640 bindings as at least the overridden one might not yet be resolved and we
9641 need those positions in the check below. */
9642 proc_pass_arg = old_pass_arg = 0;
9643 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
9645 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
9648 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
9649 proc_formal && old_formal;
9650 proc_formal = proc_formal->next, old_formal = old_formal->next)
9652 if (proc->n.tb->pass_arg
9653 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
9654 proc_pass_arg = argpos;
9655 if (old->n.tb->pass_arg
9656 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
9657 old_pass_arg = argpos;
9659 /* Check that the names correspond. */
9660 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
9662 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
9663 " to match the corresponding argument of the overridden"
9664 " procedure", proc_formal->sym->name, proc->name, &where,
9665 old_formal->sym->name);
9669 /* Check that the types correspond if neither is the passed-object
9671 /* FIXME: Do more comprehensive testing here. */
9672 if (proc_pass_arg != argpos && old_pass_arg != argpos
9673 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
9675 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
9676 "in respect to the overridden procedure",
9677 proc_formal->sym->name, proc->name, &where);
9683 if (proc_formal || old_formal)
9685 gfc_error ("'%s' at %L must have the same number of formal arguments as"
9686 " the overridden procedure", proc->name, &where);
9690 /* If the overridden binding is NOPASS, the overriding one must also be
9692 if (old->n.tb->nopass && !proc->n.tb->nopass)
9694 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
9695 " NOPASS", proc->name, &where);
9699 /* If the overridden binding is PASS(x), the overriding one must also be
9700 PASS and the passed-object dummy arguments must correspond. */
9701 if (!old->n.tb->nopass)
9703 if (proc->n.tb->nopass)
9705 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
9706 " PASS", proc->name, &where);
9710 if (proc_pass_arg != old_pass_arg)
9712 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
9713 " the same position as the passed-object dummy argument of"
9714 " the overridden procedure", proc->name, &where);
9723 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
9726 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
9727 const char* generic_name, locus where)
9732 gcc_assert (t1->specific && t2->specific);
9733 gcc_assert (!t1->specific->is_generic);
9734 gcc_assert (!t2->specific->is_generic);
9736 sym1 = t1->specific->u.specific->n.sym;
9737 sym2 = t2->specific->u.specific->n.sym;
9742 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
9743 if (sym1->attr.subroutine != sym2->attr.subroutine
9744 || sym1->attr.function != sym2->attr.function)
9746 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
9747 " GENERIC '%s' at %L",
9748 sym1->name, sym2->name, generic_name, &where);
9752 /* Compare the interfaces. */
9753 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
9755 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
9756 sym1->name, sym2->name, generic_name, &where);
9764 /* Worker function for resolving a generic procedure binding; this is used to
9765 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
9767 The difference between those cases is finding possible inherited bindings
9768 that are overridden, as one has to look for them in tb_sym_root,
9769 tb_uop_root or tb_op, respectively. Thus the caller must already find
9770 the super-type and set p->overridden correctly. */
9773 resolve_tb_generic_targets (gfc_symbol* super_type,
9774 gfc_typebound_proc* p, const char* name)
9776 gfc_tbp_generic* target;
9777 gfc_symtree* first_target;
9778 gfc_symtree* inherited;
9780 gcc_assert (p && p->is_generic);
9782 /* Try to find the specific bindings for the symtrees in our target-list. */
9783 gcc_assert (p->u.generic);
9784 for (target = p->u.generic; target; target = target->next)
9785 if (!target->specific)
9787 gfc_typebound_proc* overridden_tbp;
9789 const char* target_name;
9791 target_name = target->specific_st->name;
9793 /* Defined for this type directly. */
9794 if (target->specific_st->n.tb)
9796 target->specific = target->specific_st->n.tb;
9797 goto specific_found;
9800 /* Look for an inherited specific binding. */
9803 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
9808 gcc_assert (inherited->n.tb);
9809 target->specific = inherited->n.tb;
9810 goto specific_found;
9814 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
9815 " at %L", target_name, name, &p->where);
9818 /* Once we've found the specific binding, check it is not ambiguous with
9819 other specifics already found or inherited for the same GENERIC. */
9821 gcc_assert (target->specific);
9823 /* This must really be a specific binding! */
9824 if (target->specific->is_generic)
9826 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
9827 " '%s' is GENERIC, too", name, &p->where, target_name);
9831 /* Check those already resolved on this type directly. */
9832 for (g = p->u.generic; g; g = g->next)
9833 if (g != target && g->specific
9834 && check_generic_tbp_ambiguity (target, g, name, p->where)
9838 /* Check for ambiguity with inherited specific targets. */
9839 for (overridden_tbp = p->overridden; overridden_tbp;
9840 overridden_tbp = overridden_tbp->overridden)
9841 if (overridden_tbp->is_generic)
9843 for (g = overridden_tbp->u.generic; g; g = g->next)
9845 gcc_assert (g->specific);
9846 if (check_generic_tbp_ambiguity (target, g,
9847 name, p->where) == FAILURE)
9853 /* If we attempt to "overwrite" a specific binding, this is an error. */
9854 if (p->overridden && !p->overridden->is_generic)
9856 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
9857 " the same name", name, &p->where);
9861 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
9862 all must have the same attributes here. */
9863 first_target = p->u.generic->specific->u.specific;
9864 gcc_assert (first_target);
9865 p->subroutine = first_target->n.sym->attr.subroutine;
9866 p->function = first_target->n.sym->attr.function;
9872 /* Resolve a GENERIC procedure binding for a derived type. */
9875 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
9877 gfc_symbol* super_type;
9879 /* Find the overridden binding if any. */
9880 st->n.tb->overridden = NULL;
9881 super_type = gfc_get_derived_super_type (derived);
9884 gfc_symtree* overridden;
9885 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
9888 if (overridden && overridden->n.tb)
9889 st->n.tb->overridden = overridden->n.tb;
9892 /* Resolve using worker function. */
9893 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
9897 /* Retrieve the target-procedure of an operator binding and do some checks in
9898 common for intrinsic and user-defined type-bound operators. */
9901 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
9903 gfc_symbol* target_proc;
9905 gcc_assert (target->specific && !target->specific->is_generic);
9906 target_proc = target->specific->u.specific->n.sym;
9907 gcc_assert (target_proc);
9909 /* All operator bindings must have a passed-object dummy argument. */
9910 if (target->specific->nopass)
9912 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
9920 /* Resolve a type-bound intrinsic operator. */
9923 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
9924 gfc_typebound_proc* p)
9926 gfc_symbol* super_type;
9927 gfc_tbp_generic* target;
9929 /* If there's already an error here, do nothing (but don't fail again). */
9933 /* Operators should always be GENERIC bindings. */
9934 gcc_assert (p->is_generic);
9936 /* Look for an overridden binding. */
9937 super_type = gfc_get_derived_super_type (derived);
9938 if (super_type && super_type->f2k_derived)
9939 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
9942 p->overridden = NULL;
9944 /* Resolve general GENERIC properties using worker function. */
9945 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
9948 /* Check the targets to be procedures of correct interface. */
9949 for (target = p->u.generic; target; target = target->next)
9951 gfc_symbol* target_proc;
9953 target_proc = get_checked_tb_operator_target (target, p->where);
9957 if (!gfc_check_operator_interface (target_proc, op, p->where))
9969 /* Resolve a type-bound user operator (tree-walker callback). */
9971 static gfc_symbol* resolve_bindings_derived;
9972 static gfc_try resolve_bindings_result;
9974 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
9977 resolve_typebound_user_op (gfc_symtree* stree)
9979 gfc_symbol* super_type;
9980 gfc_tbp_generic* target;
9982 gcc_assert (stree && stree->n.tb);
9984 if (stree->n.tb->error)
9987 /* Operators should always be GENERIC bindings. */
9988 gcc_assert (stree->n.tb->is_generic);
9990 /* Find overridden procedure, if any. */
9991 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9992 if (super_type && super_type->f2k_derived)
9994 gfc_symtree* overridden;
9995 overridden = gfc_find_typebound_user_op (super_type, NULL,
9996 stree->name, true, NULL);
9998 if (overridden && overridden->n.tb)
9999 stree->n.tb->overridden = overridden->n.tb;
10002 stree->n.tb->overridden = NULL;
10004 /* Resolve basically using worker function. */
10005 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10009 /* Check the targets to be functions of correct interface. */
10010 for (target = stree->n.tb->u.generic; target; target = target->next)
10012 gfc_symbol* target_proc;
10014 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10018 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10025 resolve_bindings_result = FAILURE;
10026 stree->n.tb->error = 1;
10030 /* Resolve the type-bound procedures for a derived type. */
10033 resolve_typebound_procedure (gfc_symtree* stree)
10037 gfc_symbol* me_arg;
10038 gfc_symbol* super_type;
10039 gfc_component* comp;
10041 gcc_assert (stree);
10043 /* Undefined specific symbol from GENERIC target definition. */
10047 if (stree->n.tb->error)
10050 /* If this is a GENERIC binding, use that routine. */
10051 if (stree->n.tb->is_generic)
10053 if (resolve_typebound_generic (resolve_bindings_derived, stree)
10059 /* Get the target-procedure to check it. */
10060 gcc_assert (!stree->n.tb->is_generic);
10061 gcc_assert (stree->n.tb->u.specific);
10062 proc = stree->n.tb->u.specific->n.sym;
10063 where = stree->n.tb->where;
10065 /* Default access should already be resolved from the parser. */
10066 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
10068 /* It should be a module procedure or an external procedure with explicit
10069 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
10070 if ((!proc->attr.subroutine && !proc->attr.function)
10071 || (proc->attr.proc != PROC_MODULE
10072 && proc->attr.if_source != IFSRC_IFBODY)
10073 || (proc->attr.abstract && !stree->n.tb->deferred))
10075 gfc_error ("'%s' must be a module procedure or an external procedure with"
10076 " an explicit interface at %L", proc->name, &where);
10079 stree->n.tb->subroutine = proc->attr.subroutine;
10080 stree->n.tb->function = proc->attr.function;
10082 /* Find the super-type of the current derived type. We could do this once and
10083 store in a global if speed is needed, but as long as not I believe this is
10084 more readable and clearer. */
10085 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10087 /* If PASS, resolve and check arguments if not already resolved / loaded
10088 from a .mod file. */
10089 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
10091 if (stree->n.tb->pass_arg)
10093 gfc_formal_arglist* i;
10095 /* If an explicit passing argument name is given, walk the arg-list
10096 and look for it. */
10099 stree->n.tb->pass_arg_num = 1;
10100 for (i = proc->formal; i; i = i->next)
10102 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
10107 ++stree->n.tb->pass_arg_num;
10112 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
10114 proc->name, stree->n.tb->pass_arg, &where,
10115 stree->n.tb->pass_arg);
10121 /* Otherwise, take the first one; there should in fact be at least
10123 stree->n.tb->pass_arg_num = 1;
10126 gfc_error ("Procedure '%s' with PASS at %L must have at"
10127 " least one argument", proc->name, &where);
10130 me_arg = proc->formal->sym;
10133 /* Now check that the argument-type matches and the passed-object
10134 dummy argument is generally fine. */
10136 gcc_assert (me_arg);
10138 if (me_arg->ts.type != BT_CLASS)
10140 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10141 " at %L", proc->name, &where);
10145 if (me_arg->ts.u.derived->components->ts.u.derived
10146 != resolve_bindings_derived)
10148 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10149 " the derived-type '%s'", me_arg->name, proc->name,
10150 me_arg->name, &where, resolve_bindings_derived->name);
10154 gcc_assert (me_arg->ts.type == BT_CLASS);
10155 if (me_arg->ts.u.derived->components->as
10156 && me_arg->ts.u.derived->components->as->rank > 0)
10158 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
10159 " scalar", proc->name, &where);
10162 if (me_arg->ts.u.derived->components->attr.allocatable)
10164 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10165 " be ALLOCATABLE", proc->name, &where);
10168 if (me_arg->ts.u.derived->components->attr.class_pointer)
10170 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10171 " be POINTER", proc->name, &where);
10176 /* If we are extending some type, check that we don't override a procedure
10177 flagged NON_OVERRIDABLE. */
10178 stree->n.tb->overridden = NULL;
10181 gfc_symtree* overridden;
10182 overridden = gfc_find_typebound_proc (super_type, NULL,
10183 stree->name, true, NULL);
10185 if (overridden && overridden->n.tb)
10186 stree->n.tb->overridden = overridden->n.tb;
10188 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
10192 /* See if there's a name collision with a component directly in this type. */
10193 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
10194 if (!strcmp (comp->name, stree->name))
10196 gfc_error ("Procedure '%s' at %L has the same name as a component of"
10198 stree->name, &where, resolve_bindings_derived->name);
10202 /* Try to find a name collision with an inherited component. */
10203 if (super_type && gfc_find_component (super_type, stree->name, true, true))
10205 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
10206 " component of '%s'",
10207 stree->name, &where, resolve_bindings_derived->name);
10211 stree->n.tb->error = 0;
10215 resolve_bindings_result = FAILURE;
10216 stree->n.tb->error = 1;
10220 resolve_typebound_procedures (gfc_symbol* derived)
10224 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10227 resolve_bindings_derived = derived;
10228 resolve_bindings_result = SUCCESS;
10230 if (derived->f2k_derived->tb_sym_root)
10231 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10232 &resolve_typebound_procedure);
10234 if (derived->f2k_derived->tb_uop_root)
10235 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10236 &resolve_typebound_user_op);
10238 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10240 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10241 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10243 resolve_bindings_result = FAILURE;
10246 return resolve_bindings_result;
10250 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10251 to give all identical derived types the same backend_decl. */
10253 add_dt_to_dt_list (gfc_symbol *derived)
10255 gfc_dt_list *dt_list;
10257 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10258 if (derived == dt_list->derived)
10261 if (dt_list == NULL)
10263 dt_list = gfc_get_dt_list ();
10264 dt_list->next = gfc_derived_types;
10265 dt_list->derived = derived;
10266 gfc_derived_types = dt_list;
10271 /* Ensure that a derived-type is really not abstract, meaning that every
10272 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10275 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10280 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10282 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10285 if (st->n.tb && st->n.tb->deferred)
10287 gfc_symtree* overriding;
10288 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10289 gcc_assert (overriding && overriding->n.tb);
10290 if (overriding->n.tb->deferred)
10292 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10293 " '%s' is DEFERRED and not overridden",
10294 sub->name, &sub->declared_at, st->name);
10303 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10305 /* The algorithm used here is to recursively travel up the ancestry of sub
10306 and for each ancestor-type, check all bindings. If any of them is
10307 DEFERRED, look it up starting from sub and see if the found (overriding)
10308 binding is not DEFERRED.
10309 This is not the most efficient way to do this, but it should be ok and is
10310 clearer than something sophisticated. */
10312 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
10314 /* Walk bindings of this ancestor. */
10315 if (ancestor->f2k_derived)
10318 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10323 /* Find next ancestor type and recurse on it. */
10324 ancestor = gfc_get_derived_super_type (ancestor);
10326 return ensure_not_abstract (sub, ancestor);
10332 static void resolve_symbol (gfc_symbol *sym);
10335 /* Resolve the components of a derived type. */
10338 resolve_fl_derived (gfc_symbol *sym)
10340 gfc_symbol* super_type;
10344 super_type = gfc_get_derived_super_type (sym);
10346 /* Ensure the extended type gets resolved before we do. */
10347 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10350 /* An ABSTRACT type must be extensible. */
10351 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10353 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10354 sym->name, &sym->declared_at);
10358 for (c = sym->components; c != NULL; c = c->next)
10360 if (c->attr.proc_pointer && c->ts.interface)
10362 if (c->ts.interface->attr.procedure)
10363 gfc_error ("Interface '%s', used by procedure pointer component "
10364 "'%s' at %L, is declared in a later PROCEDURE statement",
10365 c->ts.interface->name, c->name, &c->loc);
10367 /* Get the attributes from the interface (now resolved). */
10368 if (c->ts.interface->attr.if_source
10369 || c->ts.interface->attr.intrinsic)
10371 gfc_symbol *ifc = c->ts.interface;
10373 if (ifc->formal && !ifc->formal_ns)
10374 resolve_symbol (ifc);
10376 if (ifc->attr.intrinsic)
10377 resolve_intrinsic (ifc, &ifc->declared_at);
10381 c->ts = ifc->result->ts;
10382 c->attr.allocatable = ifc->result->attr.allocatable;
10383 c->attr.pointer = ifc->result->attr.pointer;
10384 c->attr.dimension = ifc->result->attr.dimension;
10385 c->as = gfc_copy_array_spec (ifc->result->as);
10390 c->attr.allocatable = ifc->attr.allocatable;
10391 c->attr.pointer = ifc->attr.pointer;
10392 c->attr.dimension = ifc->attr.dimension;
10393 c->as = gfc_copy_array_spec (ifc->as);
10395 c->ts.interface = ifc;
10396 c->attr.function = ifc->attr.function;
10397 c->attr.subroutine = ifc->attr.subroutine;
10398 gfc_copy_formal_args_ppc (c, ifc);
10400 c->attr.pure = ifc->attr.pure;
10401 c->attr.elemental = ifc->attr.elemental;
10402 c->attr.recursive = ifc->attr.recursive;
10403 c->attr.always_explicit = ifc->attr.always_explicit;
10404 c->attr.ext_attr |= ifc->attr.ext_attr;
10405 /* Replace symbols in array spec. */
10409 for (i = 0; i < c->as->rank; i++)
10411 gfc_expr_replace_comp (c->as->lower[i], c);
10412 gfc_expr_replace_comp (c->as->upper[i], c);
10415 /* Copy char length. */
10416 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10418 c->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10419 gfc_expr_replace_comp (c->ts.u.cl->length, c);
10422 else if (c->ts.interface->name[0] != '\0')
10424 gfc_error ("Interface '%s' of procedure pointer component "
10425 "'%s' at %L must be explicit", c->ts.interface->name,
10430 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10432 /* Since PPCs are not implicitly typed, a PPC without an explicit
10433 interface must be a subroutine. */
10434 gfc_add_subroutine (&c->attr, c->name, &c->loc);
10437 /* Procedure pointer components: Check PASS arg. */
10438 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0)
10440 gfc_symbol* me_arg;
10442 if (c->tb->pass_arg)
10444 gfc_formal_arglist* i;
10446 /* If an explicit passing argument name is given, walk the arg-list
10447 and look for it. */
10450 c->tb->pass_arg_num = 1;
10451 for (i = c->formal; i; i = i->next)
10453 if (!strcmp (i->sym->name, c->tb->pass_arg))
10458 c->tb->pass_arg_num++;
10463 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10464 "at %L has no argument '%s'", c->name,
10465 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10472 /* Otherwise, take the first one; there should in fact be at least
10474 c->tb->pass_arg_num = 1;
10477 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10478 "must have at least one argument",
10483 me_arg = c->formal->sym;
10486 /* Now check that the argument-type matches. */
10487 gcc_assert (me_arg);
10488 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10489 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10490 || (me_arg->ts.type == BT_CLASS
10491 && me_arg->ts.u.derived->components->ts.u.derived != sym))
10493 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10494 " the derived type '%s'", me_arg->name, c->name,
10495 me_arg->name, &c->loc, sym->name);
10500 /* Check for C453. */
10501 if (me_arg->attr.dimension)
10503 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10504 "must be scalar", me_arg->name, c->name, me_arg->name,
10510 if (me_arg->attr.pointer)
10512 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10513 "may not have the POINTER attribute", me_arg->name,
10514 c->name, me_arg->name, &c->loc);
10519 if (me_arg->attr.allocatable)
10521 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10522 "may not be ALLOCATABLE", me_arg->name, c->name,
10523 me_arg->name, &c->loc);
10528 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
10529 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10530 " at %L", c->name, &c->loc);
10534 /* Check type-spec if this is not the parent-type component. */
10535 if ((!sym->attr.extension || c != sym->components)
10536 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
10539 /* If this type is an extension, set the accessibility of the parent
10541 if (super_type && c == sym->components
10542 && strcmp (super_type->name, c->name) == 0)
10543 c->attr.access = super_type->attr.access;
10545 /* If this type is an extension, see if this component has the same name
10546 as an inherited type-bound procedure. */
10548 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
10550 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
10551 " inherited type-bound procedure",
10552 c->name, sym->name, &c->loc);
10556 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
10558 if (c->ts.u.cl->length == NULL
10559 || (resolve_charlen (c->ts.u.cl) == FAILURE)
10560 || !gfc_is_constant_expr (c->ts.u.cl->length))
10562 gfc_error ("Character length of component '%s' needs to "
10563 "be a constant specification expression at %L",
10565 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
10570 if (c->ts.type == BT_DERIVED
10571 && sym->component_access != ACCESS_PRIVATE
10572 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10573 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
10574 && !c->ts.u.derived->attr.use_assoc
10575 && !gfc_check_access (c->ts.u.derived->attr.access,
10576 c->ts.u.derived->ns->default_access)
10577 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
10578 "is a PRIVATE type and cannot be a component of "
10579 "'%s', which is PUBLIC at %L", c->name,
10580 sym->name, &sym->declared_at) == FAILURE)
10583 if (sym->attr.sequence)
10585 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
10587 gfc_error ("Component %s of SEQUENCE type declared at %L does "
10588 "not have the SEQUENCE attribute",
10589 c->ts.u.derived->name, &sym->declared_at);
10594 if (c->ts.type == BT_DERIVED && c->attr.pointer
10595 && c->ts.u.derived->components == NULL
10596 && !c->ts.u.derived->attr.zero_comp)
10598 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10599 "that has not been declared", c->name, sym->name,
10605 if (c->ts.type == BT_CLASS
10606 && !(c->ts.u.derived->components->attr.pointer
10607 || c->ts.u.derived->components->attr.allocatable))
10609 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
10610 "or pointer", c->name, &c->loc);
10614 /* Ensure that all the derived type components are put on the
10615 derived type list; even in formal namespaces, where derived type
10616 pointer components might not have been declared. */
10617 if (c->ts.type == BT_DERIVED
10619 && c->ts.u.derived->components
10621 && sym != c->ts.u.derived)
10622 add_dt_to_dt_list (c->ts.u.derived);
10624 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
10628 for (i = 0; i < c->as->rank; i++)
10630 if (c->as->lower[i] == NULL
10631 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
10632 || !gfc_is_constant_expr (c->as->lower[i])
10633 || c->as->upper[i] == NULL
10634 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
10635 || !gfc_is_constant_expr (c->as->upper[i]))
10637 gfc_error ("Component '%s' of '%s' at %L must have "
10638 "constant array bounds",
10639 c->name, sym->name, &c->loc);
10645 /* Resolve the type-bound procedures. */
10646 if (resolve_typebound_procedures (sym) == FAILURE)
10649 /* Resolve the finalizer procedures. */
10650 if (gfc_resolve_finalizers (sym) == FAILURE)
10653 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
10654 all DEFERRED bindings are overridden. */
10655 if (super_type && super_type->attr.abstract && !sym->attr.abstract
10656 && ensure_not_abstract (sym, super_type) == FAILURE)
10659 /* Add derived type to the derived type list. */
10660 add_dt_to_dt_list (sym);
10667 resolve_fl_namelist (gfc_symbol *sym)
10672 /* Reject PRIVATE objects in a PUBLIC namelist. */
10673 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
10675 for (nl = sym->namelist; nl; nl = nl->next)
10677 if (!nl->sym->attr.use_assoc
10678 && !is_sym_host_assoc (nl->sym, sym->ns)
10679 && !gfc_check_access(nl->sym->attr.access,
10680 nl->sym->ns->default_access))
10682 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
10683 "cannot be member of PUBLIC namelist '%s' at %L",
10684 nl->sym->name, sym->name, &sym->declared_at);
10688 /* Types with private components that came here by USE-association. */
10689 if (nl->sym->ts.type == BT_DERIVED
10690 && derived_inaccessible (nl->sym->ts.u.derived))
10692 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
10693 "components and cannot be member of namelist '%s' at %L",
10694 nl->sym->name, sym->name, &sym->declared_at);
10698 /* Types with private components that are defined in the same module. */
10699 if (nl->sym->ts.type == BT_DERIVED
10700 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
10701 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
10702 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
10703 nl->sym->ns->default_access))
10705 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
10706 "cannot be a member of PUBLIC namelist '%s' at %L",
10707 nl->sym->name, sym->name, &sym->declared_at);
10713 for (nl = sym->namelist; nl; nl = nl->next)
10715 /* Reject namelist arrays of assumed shape. */
10716 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
10717 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
10718 "must not have assumed shape in namelist "
10719 "'%s' at %L", nl->sym->name, sym->name,
10720 &sym->declared_at) == FAILURE)
10723 /* Reject namelist arrays that are not constant shape. */
10724 if (is_non_constant_shape_array (nl->sym))
10726 gfc_error ("NAMELIST array object '%s' must have constant "
10727 "shape in namelist '%s' at %L", nl->sym->name,
10728 sym->name, &sym->declared_at);
10732 /* Namelist objects cannot have allocatable or pointer components. */
10733 if (nl->sym->ts.type != BT_DERIVED)
10736 if (nl->sym->ts.u.derived->attr.alloc_comp)
10738 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10739 "have ALLOCATABLE components",
10740 nl->sym->name, sym->name, &sym->declared_at);
10744 if (nl->sym->ts.u.derived->attr.pointer_comp)
10746 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10747 "have POINTER components",
10748 nl->sym->name, sym->name, &sym->declared_at);
10754 /* 14.1.2 A module or internal procedure represent local entities
10755 of the same type as a namelist member and so are not allowed. */
10756 for (nl = sym->namelist; nl; nl = nl->next)
10758 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
10761 if (nl->sym->attr.function && nl->sym == nl->sym->result)
10762 if ((nl->sym == sym->ns->proc_name)
10764 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
10768 if (nl->sym && nl->sym->name)
10769 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
10770 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
10772 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
10773 "attribute in '%s' at %L", nlsym->name,
10774 &sym->declared_at);
10784 resolve_fl_parameter (gfc_symbol *sym)
10786 /* A parameter array's shape needs to be constant. */
10787 if (sym->as != NULL
10788 && (sym->as->type == AS_DEFERRED
10789 || is_non_constant_shape_array (sym)))
10791 gfc_error ("Parameter array '%s' at %L cannot be automatic "
10792 "or of deferred shape", sym->name, &sym->declared_at);
10796 /* Make sure a parameter that has been implicitly typed still
10797 matches the implicit type, since PARAMETER statements can precede
10798 IMPLICIT statements. */
10799 if (sym->attr.implicit_type
10800 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
10803 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
10804 "later IMPLICIT type", sym->name, &sym->declared_at);
10808 /* Make sure the types of derived parameters are consistent. This
10809 type checking is deferred until resolution because the type may
10810 refer to a derived type from the host. */
10811 if (sym->ts.type == BT_DERIVED
10812 && !gfc_compare_types (&sym->ts, &sym->value->ts))
10814 gfc_error ("Incompatible derived type in PARAMETER at %L",
10815 &sym->value->where);
10822 /* Do anything necessary to resolve a symbol. Right now, we just
10823 assume that an otherwise unknown symbol is a variable. This sort
10824 of thing commonly happens for symbols in module. */
10827 resolve_symbol (gfc_symbol *sym)
10829 int check_constant, mp_flag;
10830 gfc_symtree *symtree;
10831 gfc_symtree *this_symtree;
10835 if (sym->attr.flavor == FL_UNKNOWN)
10838 /* If we find that a flavorless symbol is an interface in one of the
10839 parent namespaces, find its symtree in this namespace, free the
10840 symbol and set the symtree to point to the interface symbol. */
10841 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
10843 symtree = gfc_find_symtree (ns->sym_root, sym->name);
10844 if (symtree && symtree->n.sym->generic)
10846 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
10850 gfc_free_symbol (sym);
10851 symtree->n.sym->refs++;
10852 this_symtree->n.sym = symtree->n.sym;
10857 /* Otherwise give it a flavor according to such attributes as
10859 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
10860 sym->attr.flavor = FL_VARIABLE;
10863 sym->attr.flavor = FL_PROCEDURE;
10864 if (sym->attr.dimension)
10865 sym->attr.function = 1;
10869 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
10870 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
10872 if (sym->attr.procedure && sym->ts.interface
10873 && sym->attr.if_source != IFSRC_DECL)
10875 if (sym->ts.interface == sym)
10877 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
10878 "interface", sym->name, &sym->declared_at);
10881 if (sym->ts.interface->attr.procedure)
10883 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
10884 " in a later PROCEDURE statement", sym->ts.interface->name,
10885 sym->name,&sym->declared_at);
10889 /* Get the attributes from the interface (now resolved). */
10890 if (sym->ts.interface->attr.if_source
10891 || sym->ts.interface->attr.intrinsic)
10893 gfc_symbol *ifc = sym->ts.interface;
10894 resolve_symbol (ifc);
10896 if (ifc->attr.intrinsic)
10897 resolve_intrinsic (ifc, &ifc->declared_at);
10900 sym->ts = ifc->result->ts;
10903 sym->ts.interface = ifc;
10904 sym->attr.function = ifc->attr.function;
10905 sym->attr.subroutine = ifc->attr.subroutine;
10906 gfc_copy_formal_args (sym, ifc);
10908 sym->attr.allocatable = ifc->attr.allocatable;
10909 sym->attr.pointer = ifc->attr.pointer;
10910 sym->attr.pure = ifc->attr.pure;
10911 sym->attr.elemental = ifc->attr.elemental;
10912 sym->attr.dimension = ifc->attr.dimension;
10913 sym->attr.recursive = ifc->attr.recursive;
10914 sym->attr.always_explicit = ifc->attr.always_explicit;
10915 sym->attr.ext_attr |= ifc->attr.ext_attr;
10916 /* Copy array spec. */
10917 sym->as = gfc_copy_array_spec (ifc->as);
10921 for (i = 0; i < sym->as->rank; i++)
10923 gfc_expr_replace_symbols (sym->as->lower[i], sym);
10924 gfc_expr_replace_symbols (sym->as->upper[i], sym);
10927 /* Copy char length. */
10928 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10930 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10931 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
10934 else if (sym->ts.interface->name[0] != '\0')
10936 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
10937 sym->ts.interface->name, sym->name, &sym->declared_at);
10942 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
10945 /* Symbols that are module procedures with results (functions) have
10946 the types and array specification copied for type checking in
10947 procedures that call them, as well as for saving to a module
10948 file. These symbols can't stand the scrutiny that their results
10950 mp_flag = (sym->result != NULL && sym->result != sym);
10953 /* Make sure that the intrinsic is consistent with its internal
10954 representation. This needs to be done before assigning a default
10955 type to avoid spurious warnings. */
10956 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
10957 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
10960 /* Assign default type to symbols that need one and don't have one. */
10961 if (sym->ts.type == BT_UNKNOWN)
10963 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
10964 gfc_set_default_type (sym, 1, NULL);
10966 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
10967 && !sym->attr.function && !sym->attr.subroutine
10968 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
10969 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
10971 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
10973 /* The specific case of an external procedure should emit an error
10974 in the case that there is no implicit type. */
10976 gfc_set_default_type (sym, sym->attr.external, NULL);
10979 /* Result may be in another namespace. */
10980 resolve_symbol (sym->result);
10982 if (!sym->result->attr.proc_pointer)
10984 sym->ts = sym->result->ts;
10985 sym->as = gfc_copy_array_spec (sym->result->as);
10986 sym->attr.dimension = sym->result->attr.dimension;
10987 sym->attr.pointer = sym->result->attr.pointer;
10988 sym->attr.allocatable = sym->result->attr.allocatable;
10994 /* Assumed size arrays and assumed shape arrays must be dummy
10997 if (sym->as != NULL
10998 && (sym->as->type == AS_ASSUMED_SIZE
10999 || sym->as->type == AS_ASSUMED_SHAPE)
11000 && sym->attr.dummy == 0)
11002 if (sym->as->type == AS_ASSUMED_SIZE)
11003 gfc_error ("Assumed size array at %L must be a dummy argument",
11004 &sym->declared_at);
11006 gfc_error ("Assumed shape array at %L must be a dummy argument",
11007 &sym->declared_at);
11011 /* Make sure symbols with known intent or optional are really dummy
11012 variable. Because of ENTRY statement, this has to be deferred
11013 until resolution time. */
11015 if (!sym->attr.dummy
11016 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
11018 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
11022 if (sym->attr.value && !sym->attr.dummy)
11024 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
11025 "it is not a dummy argument", sym->name, &sym->declared_at);
11029 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
11031 gfc_charlen *cl = sym->ts.u.cl;
11032 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
11034 gfc_error ("Character dummy variable '%s' at %L with VALUE "
11035 "attribute must have constant length",
11036 sym->name, &sym->declared_at);
11040 if (sym->ts.is_c_interop
11041 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
11043 gfc_error ("C interoperable character dummy variable '%s' at %L "
11044 "with VALUE attribute must have length one",
11045 sym->name, &sym->declared_at);
11050 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
11051 do this for something that was implicitly typed because that is handled
11052 in gfc_set_default_type. Handle dummy arguments and procedure
11053 definitions separately. Also, anything that is use associated is not
11054 handled here but instead is handled in the module it is declared in.
11055 Finally, derived type definitions are allowed to be BIND(C) since that
11056 only implies that they're interoperable, and they are checked fully for
11057 interoperability when a variable is declared of that type. */
11058 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
11059 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
11060 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
11062 gfc_try t = SUCCESS;
11064 /* First, make sure the variable is declared at the
11065 module-level scope (J3/04-007, Section 15.3). */
11066 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
11067 sym->attr.in_common == 0)
11069 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
11070 "is neither a COMMON block nor declared at the "
11071 "module level scope", sym->name, &(sym->declared_at));
11074 else if (sym->common_head != NULL)
11076 t = verify_com_block_vars_c_interop (sym->common_head);
11080 /* If type() declaration, we need to verify that the components
11081 of the given type are all C interoperable, etc. */
11082 if (sym->ts.type == BT_DERIVED &&
11083 sym->ts.u.derived->attr.is_c_interop != 1)
11085 /* Make sure the user marked the derived type as BIND(C). If
11086 not, call the verify routine. This could print an error
11087 for the derived type more than once if multiple variables
11088 of that type are declared. */
11089 if (sym->ts.u.derived->attr.is_bind_c != 1)
11090 verify_bind_c_derived_type (sym->ts.u.derived);
11094 /* Verify the variable itself as C interoperable if it
11095 is BIND(C). It is not possible for this to succeed if
11096 the verify_bind_c_derived_type failed, so don't have to handle
11097 any error returned by verify_bind_c_derived_type. */
11098 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
11099 sym->common_block);
11104 /* clear the is_bind_c flag to prevent reporting errors more than
11105 once if something failed. */
11106 sym->attr.is_bind_c = 0;
11111 /* If a derived type symbol has reached this point, without its
11112 type being declared, we have an error. Notice that most
11113 conditions that produce undefined derived types have already
11114 been dealt with. However, the likes of:
11115 implicit type(t) (t) ..... call foo (t) will get us here if
11116 the type is not declared in the scope of the implicit
11117 statement. Change the type to BT_UNKNOWN, both because it is so
11118 and to prevent an ICE. */
11119 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
11120 && !sym->ts.u.derived->attr.zero_comp)
11122 gfc_error ("The derived type '%s' at %L is of type '%s', "
11123 "which has not been defined", sym->name,
11124 &sym->declared_at, sym->ts.u.derived->name);
11125 sym->ts.type = BT_UNKNOWN;
11129 /* Make sure that the derived type has been resolved and that the
11130 derived type is visible in the symbol's namespace, if it is a
11131 module function and is not PRIVATE. */
11132 if (sym->ts.type == BT_DERIVED
11133 && sym->ts.u.derived->attr.use_assoc
11134 && sym->ns->proc_name
11135 && sym->ns->proc_name->attr.flavor == FL_MODULE)
11139 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
11142 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
11143 if (!ds && sym->attr.function
11144 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11146 symtree = gfc_new_symtree (&sym->ns->sym_root,
11147 sym->ts.u.derived->name);
11148 symtree->n.sym = sym->ts.u.derived;
11149 sym->ts.u.derived->refs++;
11153 /* Unless the derived-type declaration is use associated, Fortran 95
11154 does not allow public entries of private derived types.
11155 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
11156 161 in 95-006r3. */
11157 if (sym->ts.type == BT_DERIVED
11158 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
11159 && !sym->ts.u.derived->attr.use_assoc
11160 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11161 && !gfc_check_access (sym->ts.u.derived->attr.access,
11162 sym->ts.u.derived->ns->default_access)
11163 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
11164 "of PRIVATE derived type '%s'",
11165 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
11166 : "variable", sym->name, &sym->declared_at,
11167 sym->ts.u.derived->name) == FAILURE)
11170 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
11171 default initialization is defined (5.1.2.4.4). */
11172 if (sym->ts.type == BT_DERIVED
11174 && sym->attr.intent == INTENT_OUT
11176 && sym->as->type == AS_ASSUMED_SIZE)
11178 for (c = sym->ts.u.derived->components; c; c = c->next)
11180 if (c->initializer)
11182 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
11183 "ASSUMED SIZE and so cannot have a default initializer",
11184 sym->name, &sym->declared_at);
11190 switch (sym->attr.flavor)
11193 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
11198 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
11203 if (resolve_fl_namelist (sym) == FAILURE)
11208 if (resolve_fl_parameter (sym) == FAILURE)
11216 /* Resolve array specifier. Check as well some constraints
11217 on COMMON blocks. */
11219 check_constant = sym->attr.in_common && !sym->attr.pointer;
11221 /* Set the formal_arg_flag so that check_conflict will not throw
11222 an error for host associated variables in the specification
11223 expression for an array_valued function. */
11224 if (sym->attr.function && sym->as)
11225 formal_arg_flag = 1;
11227 gfc_resolve_array_spec (sym->as, check_constant);
11229 formal_arg_flag = 0;
11231 /* Resolve formal namespaces. */
11232 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11233 && !sym->attr.contained && !sym->attr.intrinsic)
11234 gfc_resolve (sym->formal_ns);
11236 /* Make sure the formal namespace is present. */
11237 if (sym->formal && !sym->formal_ns)
11239 gfc_formal_arglist *formal = sym->formal;
11240 while (formal && !formal->sym)
11241 formal = formal->next;
11245 sym->formal_ns = formal->sym->ns;
11246 sym->formal_ns->refs++;
11250 /* Check threadprivate restrictions. */
11251 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11252 && (!sym->attr.in_common
11253 && sym->module == NULL
11254 && (sym->ns->proc_name == NULL
11255 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11256 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11258 /* If we have come this far we can apply default-initializers, as
11259 described in 14.7.5, to those variables that have not already
11260 been assigned one. */
11261 if (sym->ts.type == BT_DERIVED
11262 && sym->attr.referenced
11263 && sym->ns == gfc_current_ns
11265 && !sym->attr.allocatable
11266 && !sym->attr.alloc_comp)
11268 symbol_attribute *a = &sym->attr;
11270 if ((!a->save && !a->dummy && !a->pointer
11271 && !a->in_common && !a->use_assoc
11272 && !(a->function && sym != sym->result))
11273 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11274 apply_default_init (sym);
11277 /* If this symbol has a type-spec, check it. */
11278 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11279 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11280 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11286 /************* Resolve DATA statements *************/
11290 gfc_data_value *vnode;
11296 /* Advance the values structure to point to the next value in the data list. */
11299 next_data_value (void)
11301 while (mpz_cmp_ui (values.left, 0) == 0)
11304 if (values.vnode->next == NULL)
11307 values.vnode = values.vnode->next;
11308 mpz_set (values.left, values.vnode->repeat);
11316 check_data_variable (gfc_data_variable *var, locus *where)
11322 ar_type mark = AR_UNKNOWN;
11324 mpz_t section_index[GFC_MAX_DIMENSIONS];
11330 if (gfc_resolve_expr (var->expr) == FAILURE)
11334 mpz_init_set_si (offset, 0);
11337 if (e->expr_type != EXPR_VARIABLE)
11338 gfc_internal_error ("check_data_variable(): Bad expression");
11340 sym = e->symtree->n.sym;
11342 if (sym->ns->is_block_data && !sym->attr.in_common)
11344 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11345 sym->name, &sym->declared_at);
11348 if (e->ref == NULL && sym->as)
11350 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11351 " declaration", sym->name, where);
11355 has_pointer = sym->attr.pointer;
11357 for (ref = e->ref; ref; ref = ref->next)
11359 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11363 && ref->type == REF_ARRAY
11364 && ref->u.ar.type != AR_FULL)
11366 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11367 "be a full array", sym->name, where);
11372 if (e->rank == 0 || has_pointer)
11374 mpz_init_set_ui (size, 1);
11381 /* Find the array section reference. */
11382 for (ref = e->ref; ref; ref = ref->next)
11384 if (ref->type != REF_ARRAY)
11386 if (ref->u.ar.type == AR_ELEMENT)
11392 /* Set marks according to the reference pattern. */
11393 switch (ref->u.ar.type)
11401 /* Get the start position of array section. */
11402 gfc_get_section_index (ar, section_index, &offset);
11407 gcc_unreachable ();
11410 if (gfc_array_size (e, &size) == FAILURE)
11412 gfc_error ("Nonconstant array section at %L in DATA statement",
11414 mpz_clear (offset);
11421 while (mpz_cmp_ui (size, 0) > 0)
11423 if (next_data_value () == FAILURE)
11425 gfc_error ("DATA statement at %L has more variables than values",
11431 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
11435 /* If we have more than one element left in the repeat count,
11436 and we have more than one element left in the target variable,
11437 then create a range assignment. */
11438 /* FIXME: Only done for full arrays for now, since array sections
11440 if (mark == AR_FULL && ref && ref->next == NULL
11441 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
11445 if (mpz_cmp (size, values.left) >= 0)
11447 mpz_init_set (range, values.left);
11448 mpz_sub (size, size, values.left);
11449 mpz_set_ui (values.left, 0);
11453 mpz_init_set (range, size);
11454 mpz_sub (values.left, values.left, size);
11455 mpz_set_ui (size, 0);
11458 gfc_assign_data_value_range (var->expr, values.vnode->expr,
11461 mpz_add (offset, offset, range);
11465 /* Assign initial value to symbol. */
11468 mpz_sub_ui (values.left, values.left, 1);
11469 mpz_sub_ui (size, size, 1);
11471 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
11475 if (mark == AR_FULL)
11476 mpz_add_ui (offset, offset, 1);
11478 /* Modify the array section indexes and recalculate the offset
11479 for next element. */
11480 else if (mark == AR_SECTION)
11481 gfc_advance_section (section_index, ar, &offset);
11485 if (mark == AR_SECTION)
11487 for (i = 0; i < ar->dimen; i++)
11488 mpz_clear (section_index[i]);
11492 mpz_clear (offset);
11498 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
11500 /* Iterate over a list of elements in a DATA statement. */
11503 traverse_data_list (gfc_data_variable *var, locus *where)
11506 iterator_stack frame;
11507 gfc_expr *e, *start, *end, *step;
11508 gfc_try retval = SUCCESS;
11510 mpz_init (frame.value);
11512 start = gfc_copy_expr (var->iter.start);
11513 end = gfc_copy_expr (var->iter.end);
11514 step = gfc_copy_expr (var->iter.step);
11516 if (gfc_simplify_expr (start, 1) == FAILURE
11517 || start->expr_type != EXPR_CONSTANT)
11519 gfc_error ("iterator start at %L does not simplify", &start->where);
11523 if (gfc_simplify_expr (end, 1) == FAILURE
11524 || end->expr_type != EXPR_CONSTANT)
11526 gfc_error ("iterator end at %L does not simplify", &end->where);
11530 if (gfc_simplify_expr (step, 1) == FAILURE
11531 || step->expr_type != EXPR_CONSTANT)
11533 gfc_error ("iterator step at %L does not simplify", &step->where);
11538 mpz_init_set (trip, end->value.integer);
11539 mpz_sub (trip, trip, start->value.integer);
11540 mpz_add (trip, trip, step->value.integer);
11542 mpz_div (trip, trip, step->value.integer);
11544 mpz_set (frame.value, start->value.integer);
11546 frame.prev = iter_stack;
11547 frame.variable = var->iter.var->symtree;
11548 iter_stack = &frame;
11550 while (mpz_cmp_ui (trip, 0) > 0)
11552 if (traverse_data_var (var->list, where) == FAILURE)
11559 e = gfc_copy_expr (var->expr);
11560 if (gfc_simplify_expr (e, 1) == FAILURE)
11568 mpz_add (frame.value, frame.value, step->value.integer);
11570 mpz_sub_ui (trip, trip, 1);
11575 mpz_clear (frame.value);
11577 gfc_free_expr (start);
11578 gfc_free_expr (end);
11579 gfc_free_expr (step);
11581 iter_stack = frame.prev;
11586 /* Type resolve variables in the variable list of a DATA statement. */
11589 traverse_data_var (gfc_data_variable *var, locus *where)
11593 for (; var; var = var->next)
11595 if (var->expr == NULL)
11596 t = traverse_data_list (var, where);
11598 t = check_data_variable (var, where);
11608 /* Resolve the expressions and iterators associated with a data statement.
11609 This is separate from the assignment checking because data lists should
11610 only be resolved once. */
11613 resolve_data_variables (gfc_data_variable *d)
11615 for (; d; d = d->next)
11617 if (d->list == NULL)
11619 if (gfc_resolve_expr (d->expr) == FAILURE)
11624 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
11627 if (resolve_data_variables (d->list) == FAILURE)
11636 /* Resolve a single DATA statement. We implement this by storing a pointer to
11637 the value list into static variables, and then recursively traversing the
11638 variables list, expanding iterators and such. */
11641 resolve_data (gfc_data *d)
11644 if (resolve_data_variables (d->var) == FAILURE)
11647 values.vnode = d->value;
11648 if (d->value == NULL)
11649 mpz_set_ui (values.left, 0);
11651 mpz_set (values.left, d->value->repeat);
11653 if (traverse_data_var (d->var, &d->where) == FAILURE)
11656 /* At this point, we better not have any values left. */
11658 if (next_data_value () == SUCCESS)
11659 gfc_error ("DATA statement at %L has more values than variables",
11664 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
11665 accessed by host or use association, is a dummy argument to a pure function,
11666 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
11667 is storage associated with any such variable, shall not be used in the
11668 following contexts: (clients of this function). */
11670 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
11671 procedure. Returns zero if assignment is OK, nonzero if there is a
11674 gfc_impure_variable (gfc_symbol *sym)
11679 if (sym->attr.use_assoc || sym->attr.in_common)
11682 /* Check if the symbol's ns is inside the pure procedure. */
11683 for (ns = gfc_current_ns; ns; ns = ns->parent)
11687 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
11691 proc = sym->ns->proc_name;
11692 if (sym->attr.dummy && gfc_pure (proc)
11693 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
11695 proc->attr.function))
11698 /* TODO: Sort out what can be storage associated, if anything, and include
11699 it here. In principle equivalences should be scanned but it does not
11700 seem to be possible to storage associate an impure variable this way. */
11705 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
11706 current namespace is inside a pure procedure. */
11709 gfc_pure (gfc_symbol *sym)
11711 symbol_attribute attr;
11716 /* Check if the current namespace or one of its parents
11717 belongs to a pure procedure. */
11718 for (ns = gfc_current_ns; ns; ns = ns->parent)
11720 sym = ns->proc_name;
11724 if (attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental))
11732 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
11736 /* Test whether the current procedure is elemental or not. */
11739 gfc_elemental (gfc_symbol *sym)
11741 symbol_attribute attr;
11744 sym = gfc_current_ns->proc_name;
11749 return attr.flavor == FL_PROCEDURE && attr.elemental;
11753 /* Warn about unused labels. */
11756 warn_unused_fortran_label (gfc_st_label *label)
11761 warn_unused_fortran_label (label->left);
11763 if (label->defined == ST_LABEL_UNKNOWN)
11766 switch (label->referenced)
11768 case ST_LABEL_UNKNOWN:
11769 gfc_warning ("Label %d at %L defined but not used", label->value,
11773 case ST_LABEL_BAD_TARGET:
11774 gfc_warning ("Label %d at %L defined but cannot be used",
11775 label->value, &label->where);
11782 warn_unused_fortran_label (label->right);
11786 /* Returns the sequence type of a symbol or sequence. */
11789 sequence_type (gfc_typespec ts)
11798 if (ts.u.derived->components == NULL)
11799 return SEQ_NONDEFAULT;
11801 result = sequence_type (ts.u.derived->components->ts);
11802 for (c = ts.u.derived->components->next; c; c = c->next)
11803 if (sequence_type (c->ts) != result)
11809 if (ts.kind != gfc_default_character_kind)
11810 return SEQ_NONDEFAULT;
11812 return SEQ_CHARACTER;
11815 if (ts.kind != gfc_default_integer_kind)
11816 return SEQ_NONDEFAULT;
11818 return SEQ_NUMERIC;
11821 if (!(ts.kind == gfc_default_real_kind
11822 || ts.kind == gfc_default_double_kind))
11823 return SEQ_NONDEFAULT;
11825 return SEQ_NUMERIC;
11828 if (ts.kind != gfc_default_complex_kind)
11829 return SEQ_NONDEFAULT;
11831 return SEQ_NUMERIC;
11834 if (ts.kind != gfc_default_logical_kind)
11835 return SEQ_NONDEFAULT;
11837 return SEQ_NUMERIC;
11840 return SEQ_NONDEFAULT;
11845 /* Resolve derived type EQUIVALENCE object. */
11848 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
11850 gfc_component *c = derived->components;
11855 /* Shall not be an object of nonsequence derived type. */
11856 if (!derived->attr.sequence)
11858 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
11859 "attribute to be an EQUIVALENCE object", sym->name,
11864 /* Shall not have allocatable components. */
11865 if (derived->attr.alloc_comp)
11867 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
11868 "components to be an EQUIVALENCE object",sym->name,
11873 if (sym->attr.in_common && has_default_initializer (sym->ts.u.derived))
11875 gfc_error ("Derived type variable '%s' at %L with default "
11876 "initialization cannot be in EQUIVALENCE with a variable "
11877 "in COMMON", sym->name, &e->where);
11881 for (; c ; c = c->next)
11883 if (c->ts.type == BT_DERIVED
11884 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
11887 /* Shall not be an object of sequence derived type containing a pointer
11888 in the structure. */
11889 if (c->attr.pointer)
11891 gfc_error ("Derived type variable '%s' at %L with pointer "
11892 "component(s) cannot be an EQUIVALENCE object",
11893 sym->name, &e->where);
11901 /* Resolve equivalence object.
11902 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
11903 an allocatable array, an object of nonsequence derived type, an object of
11904 sequence derived type containing a pointer at any level of component
11905 selection, an automatic object, a function name, an entry name, a result
11906 name, a named constant, a structure component, or a subobject of any of
11907 the preceding objects. A substring shall not have length zero. A
11908 derived type shall not have components with default initialization nor
11909 shall two objects of an equivalence group be initialized.
11910 Either all or none of the objects shall have an protected attribute.
11911 The simple constraints are done in symbol.c(check_conflict) and the rest
11912 are implemented here. */
11915 resolve_equivalence (gfc_equiv *eq)
11918 gfc_symbol *first_sym;
11921 locus *last_where = NULL;
11922 seq_type eq_type, last_eq_type;
11923 gfc_typespec *last_ts;
11924 int object, cnt_protected;
11927 last_ts = &eq->expr->symtree->n.sym->ts;
11929 first_sym = eq->expr->symtree->n.sym;
11933 for (object = 1; eq; eq = eq->eq, object++)
11937 e->ts = e->symtree->n.sym->ts;
11938 /* match_varspec might not know yet if it is seeing
11939 array reference or substring reference, as it doesn't
11941 if (e->ref && e->ref->type == REF_ARRAY)
11943 gfc_ref *ref = e->ref;
11944 sym = e->symtree->n.sym;
11946 if (sym->attr.dimension)
11948 ref->u.ar.as = sym->as;
11952 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
11953 if (e->ts.type == BT_CHARACTER
11955 && ref->type == REF_ARRAY
11956 && ref->u.ar.dimen == 1
11957 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
11958 && ref->u.ar.stride[0] == NULL)
11960 gfc_expr *start = ref->u.ar.start[0];
11961 gfc_expr *end = ref->u.ar.end[0];
11964 /* Optimize away the (:) reference. */
11965 if (start == NULL && end == NULL)
11968 e->ref = ref->next;
11970 e->ref->next = ref->next;
11975 ref->type = REF_SUBSTRING;
11977 start = gfc_int_expr (1);
11978 ref->u.ss.start = start;
11979 if (end == NULL && e->ts.u.cl)
11980 end = gfc_copy_expr (e->ts.u.cl->length);
11981 ref->u.ss.end = end;
11982 ref->u.ss.length = e->ts.u.cl;
11989 /* Any further ref is an error. */
11992 gcc_assert (ref->type == REF_ARRAY);
11993 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
11999 if (gfc_resolve_expr (e) == FAILURE)
12002 sym = e->symtree->n.sym;
12004 if (sym->attr.is_protected)
12006 if (cnt_protected > 0 && cnt_protected != object)
12008 gfc_error ("Either all or none of the objects in the "
12009 "EQUIVALENCE set at %L shall have the "
12010 "PROTECTED attribute",
12015 /* Shall not equivalence common block variables in a PURE procedure. */
12016 if (sym->ns->proc_name
12017 && sym->ns->proc_name->attr.pure
12018 && sym->attr.in_common)
12020 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
12021 "object in the pure procedure '%s'",
12022 sym->name, &e->where, sym->ns->proc_name->name);
12026 /* Shall not be a named constant. */
12027 if (e->expr_type == EXPR_CONSTANT)
12029 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
12030 "object", sym->name, &e->where);
12034 if (e->ts.type == BT_DERIVED
12035 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
12038 /* Check that the types correspond correctly:
12040 A numeric sequence structure may be equivalenced to another sequence
12041 structure, an object of default integer type, default real type, double
12042 precision real type, default logical type such that components of the
12043 structure ultimately only become associated to objects of the same
12044 kind. A character sequence structure may be equivalenced to an object
12045 of default character kind or another character sequence structure.
12046 Other objects may be equivalenced only to objects of the same type and
12047 kind parameters. */
12049 /* Identical types are unconditionally OK. */
12050 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
12051 goto identical_types;
12053 last_eq_type = sequence_type (*last_ts);
12054 eq_type = sequence_type (sym->ts);
12056 /* Since the pair of objects is not of the same type, mixed or
12057 non-default sequences can be rejected. */
12059 msg = "Sequence %s with mixed components in EQUIVALENCE "
12060 "statement at %L with different type objects";
12062 && last_eq_type == SEQ_MIXED
12063 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
12065 || (eq_type == SEQ_MIXED
12066 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12067 &e->where) == FAILURE))
12070 msg = "Non-default type object or sequence %s in EQUIVALENCE "
12071 "statement at %L with objects of different type";
12073 && last_eq_type == SEQ_NONDEFAULT
12074 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
12075 last_where) == FAILURE)
12076 || (eq_type == SEQ_NONDEFAULT
12077 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12078 &e->where) == FAILURE))
12081 msg ="Non-CHARACTER object '%s' in default CHARACTER "
12082 "EQUIVALENCE statement at %L";
12083 if (last_eq_type == SEQ_CHARACTER
12084 && eq_type != SEQ_CHARACTER
12085 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12086 &e->where) == FAILURE)
12089 msg ="Non-NUMERIC object '%s' in default NUMERIC "
12090 "EQUIVALENCE statement at %L";
12091 if (last_eq_type == SEQ_NUMERIC
12092 && eq_type != SEQ_NUMERIC
12093 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12094 &e->where) == FAILURE)
12099 last_where = &e->where;
12104 /* Shall not be an automatic array. */
12105 if (e->ref->type == REF_ARRAY
12106 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
12108 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
12109 "an EQUIVALENCE object", sym->name, &e->where);
12116 /* Shall not be a structure component. */
12117 if (r->type == REF_COMPONENT)
12119 gfc_error ("Structure component '%s' at %L cannot be an "
12120 "EQUIVALENCE object",
12121 r->u.c.component->name, &e->where);
12125 /* A substring shall not have length zero. */
12126 if (r->type == REF_SUBSTRING)
12128 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
12130 gfc_error ("Substring at %L has length zero",
12131 &r->u.ss.start->where);
12141 /* Resolve function and ENTRY types, issue diagnostics if needed. */
12144 resolve_fntype (gfc_namespace *ns)
12146 gfc_entry_list *el;
12149 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
12152 /* If there are any entries, ns->proc_name is the entry master
12153 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
12155 sym = ns->entries->sym;
12157 sym = ns->proc_name;
12158 if (sym->result == sym
12159 && sym->ts.type == BT_UNKNOWN
12160 && gfc_set_default_type (sym, 0, NULL) == FAILURE
12161 && !sym->attr.untyped)
12163 gfc_error ("Function '%s' at %L has no IMPLICIT type",
12164 sym->name, &sym->declared_at);
12165 sym->attr.untyped = 1;
12168 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
12169 && !sym->attr.contained
12170 && !gfc_check_access (sym->ts.u.derived->attr.access,
12171 sym->ts.u.derived->ns->default_access)
12172 && gfc_check_access (sym->attr.access, sym->ns->default_access))
12174 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
12175 "%L of PRIVATE type '%s'", sym->name,
12176 &sym->declared_at, sym->ts.u.derived->name);
12180 for (el = ns->entries->next; el; el = el->next)
12182 if (el->sym->result == el->sym
12183 && el->sym->ts.type == BT_UNKNOWN
12184 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
12185 && !el->sym->attr.untyped)
12187 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
12188 el->sym->name, &el->sym->declared_at);
12189 el->sym->attr.untyped = 1;
12195 /* 12.3.2.1.1 Defined operators. */
12198 check_uop_procedure (gfc_symbol *sym, locus where)
12200 gfc_formal_arglist *formal;
12202 if (!sym->attr.function)
12204 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
12205 sym->name, &where);
12209 if (sym->ts.type == BT_CHARACTER
12210 && !(sym->ts.u.cl && sym->ts.u.cl->length)
12211 && !(sym->result && sym->result->ts.u.cl
12212 && sym->result->ts.u.cl->length))
12214 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
12215 "character length", sym->name, &where);
12219 formal = sym->formal;
12220 if (!formal || !formal->sym)
12222 gfc_error ("User operator procedure '%s' at %L must have at least "
12223 "one argument", sym->name, &where);
12227 if (formal->sym->attr.intent != INTENT_IN)
12229 gfc_error ("First argument of operator interface at %L must be "
12230 "INTENT(IN)", &where);
12234 if (formal->sym->attr.optional)
12236 gfc_error ("First argument of operator interface at %L cannot be "
12237 "optional", &where);
12241 formal = formal->next;
12242 if (!formal || !formal->sym)
12245 if (formal->sym->attr.intent != INTENT_IN)
12247 gfc_error ("Second argument of operator interface at %L must be "
12248 "INTENT(IN)", &where);
12252 if (formal->sym->attr.optional)
12254 gfc_error ("Second argument of operator interface at %L cannot be "
12255 "optional", &where);
12261 gfc_error ("Operator interface at %L must have, at most, two "
12262 "arguments", &where);
12270 gfc_resolve_uops (gfc_symtree *symtree)
12272 gfc_interface *itr;
12274 if (symtree == NULL)
12277 gfc_resolve_uops (symtree->left);
12278 gfc_resolve_uops (symtree->right);
12280 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12281 check_uop_procedure (itr->sym, itr->sym->declared_at);
12285 /* Examine all of the expressions associated with a program unit,
12286 assign types to all intermediate expressions, make sure that all
12287 assignments are to compatible types and figure out which names
12288 refer to which functions or subroutines. It doesn't check code
12289 block, which is handled by resolve_code. */
12292 resolve_types (gfc_namespace *ns)
12298 gfc_namespace* old_ns = gfc_current_ns;
12300 /* Check that all IMPLICIT types are ok. */
12301 if (!ns->seen_implicit_none)
12304 for (letter = 0; letter != GFC_LETTERS; ++letter)
12305 if (ns->set_flag[letter]
12306 && resolve_typespec_used (&ns->default_type[letter],
12307 &ns->implicit_loc[letter],
12312 gfc_current_ns = ns;
12314 resolve_entries (ns);
12316 resolve_common_vars (ns->blank_common.head, false);
12317 resolve_common_blocks (ns->common_root);
12319 resolve_contained_functions (ns);
12321 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12323 for (cl = ns->cl_list; cl; cl = cl->next)
12324 resolve_charlen (cl);
12326 gfc_traverse_ns (ns, resolve_symbol);
12328 resolve_fntype (ns);
12330 for (n = ns->contained; n; n = n->sibling)
12332 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12333 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12334 "also be PURE", n->proc_name->name,
12335 &n->proc_name->declared_at);
12341 gfc_check_interfaces (ns);
12343 gfc_traverse_ns (ns, resolve_values);
12349 for (d = ns->data; d; d = d->next)
12353 gfc_traverse_ns (ns, gfc_formalize_init_value);
12355 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12357 if (ns->common_root != NULL)
12358 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12360 for (eq = ns->equiv; eq; eq = eq->next)
12361 resolve_equivalence (eq);
12363 /* Warn about unused labels. */
12364 if (warn_unused_label)
12365 warn_unused_fortran_label (ns->st_labels);
12367 gfc_resolve_uops (ns->uop_root);
12369 gfc_current_ns = old_ns;
12373 /* Call resolve_code recursively. */
12376 resolve_codes (gfc_namespace *ns)
12379 bitmap_obstack old_obstack;
12381 for (n = ns->contained; n; n = n->sibling)
12384 gfc_current_ns = ns;
12386 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
12387 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
12390 /* Set to an out of range value. */
12391 current_entry_id = -1;
12393 old_obstack = labels_obstack;
12394 bitmap_obstack_initialize (&labels_obstack);
12396 resolve_code (ns->code, ns);
12398 bitmap_obstack_release (&labels_obstack);
12399 labels_obstack = old_obstack;
12403 /* This function is called after a complete program unit has been compiled.
12404 Its purpose is to examine all of the expressions associated with a program
12405 unit, assign types to all intermediate expressions, make sure that all
12406 assignments are to compatible types and figure out which names refer to
12407 which functions or subroutines. */
12410 gfc_resolve (gfc_namespace *ns)
12412 gfc_namespace *old_ns;
12413 code_stack *old_cs_base;
12419 old_ns = gfc_current_ns;
12420 old_cs_base = cs_base;
12422 resolve_types (ns);
12423 resolve_codes (ns);
12425 gfc_current_ns = old_ns;
12426 cs_base = old_cs_base;