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.name will be set. */
2560 if (sym && sym->attr.abstract && !expr->value.function.name)
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 = e->value.compcall.name;
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 (tbp->n.tb->is_generic)
5183 /* If we have to match a passed class member, force the actual
5184 expression to have the correct type. */
5185 if (!tbp->n.tb->nopass)
5187 if (e->value.compcall.base_object == NULL)
5188 e->value.compcall.base_object =
5189 extract_compcall_passed_object (e);
5191 e->value.compcall.base_object->ts.type = BT_DERIVED;
5192 e->value.compcall.base_object->ts.u.derived = derived;
5196 e->value.compcall.tbp = tbp->n.tb;
5197 e->value.compcall.name = tbp->name;
5199 /* Let the original expresssion catch the assertion in
5200 resolve_compcall, since this flag does not appear to be reset or
5201 copied in some systems. */
5202 e->value.compcall.assign = 0;
5204 /* Do the renaming, PASSing, generic => specific and other
5205 good things for each class member. */
5206 class_try = (resolve_compcall (e, fcn_flag) == SUCCESS)
5207 ? class_try : FAILURE;
5209 /* Now transfer the found symbol to the esym list. */
5210 if (class_try == SUCCESS)
5212 etmp = list_e->value.function.class_esym;
5213 list_e->value.function.class_esym
5214 = gfc_get_class_esym_list();
5215 list_e->value.function.class_esym->next = etmp;
5216 list_e->value.function.class_esym->derived = derived;
5217 list_e->value.function.class_esym->esym
5218 = e->value.function.esym;
5223 /* Burrow down into grandchildren types. */
5224 if (derived->f2k_derived)
5225 gfc_traverse_ns (derived->f2k_derived, check_members);
5229 /* Eliminate esym_lists where all the members point to the
5230 typebound procedure of the declared type; ie. one where
5231 type selection has no effect.. */
5233 resolve_class_esym (gfc_expr *e)
5235 gfc_class_esym_list *p, *q;
5238 gcc_assert (e && e->expr_type == EXPR_FUNCTION);
5240 p = e->value.function.class_esym;
5244 for (; p; p = p->next)
5245 empty = empty && (e->value.function.esym == p->esym);
5249 p = e->value.function.class_esym;
5255 e->value.function.class_esym = NULL;
5260 /* Generate an expression for the hash value, given the reference to
5261 the class of the final expression (class_ref), the base of the
5262 full reference list (new_ref), the declared type and the class
5265 hash_value_expr (gfc_ref *class_ref, gfc_ref *new_ref, gfc_symtree *st)
5267 gfc_expr *hash_value;
5269 /* Build an expression for the correct hash_value; ie. that of the last
5273 class_ref->next = NULL;
5277 gfc_free_ref_list (new_ref);
5280 hash_value = gfc_get_expr ();
5281 hash_value->expr_type = EXPR_VARIABLE;
5282 hash_value->symtree = st;
5283 hash_value->symtree->n.sym->refs++;
5284 hash_value->ref = new_ref;
5285 gfc_add_component_ref (hash_value, "$vptr");
5286 gfc_add_component_ref (hash_value, "$hash");
5292 /* Get the ultimate declared type from an expression. In addition,
5293 return the last class/derived type reference and the copy of the
5296 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5299 gfc_symbol *declared;
5304 *new_ref = gfc_copy_ref (e->ref);
5305 for (ref = *new_ref; ref; ref = ref->next)
5307 if (ref->type != REF_COMPONENT)
5310 if (ref->u.c.component->ts.type == BT_CLASS
5311 || ref->u.c.component->ts.type == BT_DERIVED)
5313 declared = ref->u.c.component->ts.u.derived;
5318 if (declared == NULL)
5319 declared = e->symtree->n.sym->ts.u.derived;
5325 /* Resolve the argument expressions so that any arguments expressions
5326 that include class methods are resolved before the current call.
5327 This is necessary because of the static variables used in CLASS
5328 method resolution. */
5330 resolve_arg_exprs (gfc_actual_arglist *arg)
5332 /* Resolve the actual arglist expressions. */
5333 for (; arg; arg = arg->next)
5336 gfc_resolve_expr (arg->expr);
5341 /* Resolve a CLASS typebound function, or 'method'. */
5343 resolve_class_compcall (gfc_expr* e)
5345 gfc_symbol *derived, *declared;
5351 class_object = st->n.sym;
5353 /* Get the CLASS declared type. */
5354 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5356 /* Weed out cases of the ultimate component being a derived type. */
5357 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5359 gfc_free_ref_list (new_ref);
5360 return resolve_compcall (e, true);
5363 /* Resolve the argument expressions, */
5364 resolve_arg_exprs (e->value.function.actual);
5366 /* Get the data component, which is of the declared type. */
5367 derived = declared->components->ts.u.derived;
5369 /* Resolve the function call for each member of the class. */
5370 class_try = SUCCESS;
5372 list_e = gfc_copy_expr (e);
5373 check_class_members (derived);
5375 class_try = (resolve_compcall (e, true) == SUCCESS)
5376 ? class_try : FAILURE;
5378 /* Transfer the class list to the original expression. Note that
5379 the class_esym list is cleaned up in trans-expr.c, as the calls
5381 e->value.function.class_esym = list_e->value.function.class_esym;
5382 list_e->value.function.class_esym = NULL;
5383 gfc_free_expr (list_e);
5385 resolve_class_esym (e);
5387 /* More than one typebound procedure so transmit an expression for
5388 the hash_value as the selector. */
5389 if (e->value.function.class_esym != NULL)
5390 e->value.function.class_esym->hash_value
5391 = hash_value_expr (class_ref, new_ref, st);
5396 /* Resolve a CLASS typebound subroutine, or 'method'. */
5398 resolve_class_typebound_call (gfc_code *code)
5400 gfc_symbol *derived, *declared;
5405 st = code->expr1->symtree;
5406 class_object = st->n.sym;
5408 /* Get the CLASS declared type. */
5409 declared = get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5411 /* Weed out cases of the ultimate component being a derived type. */
5412 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5414 gfc_free_ref_list (new_ref);
5415 return resolve_typebound_call (code);
5418 /* Resolve the argument expressions, */
5419 resolve_arg_exprs (code->expr1->value.compcall.actual);
5421 /* Get the data component, which is of the declared type. */
5422 derived = declared->components->ts.u.derived;
5424 class_try = SUCCESS;
5426 list_e = gfc_copy_expr (code->expr1);
5427 check_class_members (derived);
5429 class_try = (resolve_typebound_call (code) == SUCCESS)
5430 ? class_try : FAILURE;
5432 /* Transfer the class list to the original expression. Note that
5433 the class_esym list is cleaned up in trans-expr.c, as the calls
5435 code->expr1->value.function.class_esym
5436 = list_e->value.function.class_esym;
5437 list_e->value.function.class_esym = NULL;
5438 gfc_free_expr (list_e);
5440 resolve_class_esym (code->expr1);
5442 /* More than one typebound procedure so transmit an expression for
5443 the hash_value as the selector. */
5444 if (code->expr1->value.function.class_esym != NULL)
5445 code->expr1->value.function.class_esym->hash_value
5446 = hash_value_expr (class_ref, new_ref, st);
5452 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5455 resolve_ppc_call (gfc_code* c)
5457 gfc_component *comp;
5460 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5463 c->resolved_sym = c->expr1->symtree->n.sym;
5464 c->expr1->expr_type = EXPR_VARIABLE;
5466 if (!comp->attr.subroutine)
5467 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5469 if (resolve_ref (c->expr1) == FAILURE)
5472 if (update_ppc_arglist (c->expr1) == FAILURE)
5475 c->ext.actual = c->expr1->value.compcall.actual;
5477 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5478 comp->formal == NULL) == FAILURE)
5481 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5487 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5490 resolve_expr_ppc (gfc_expr* e)
5492 gfc_component *comp;
5495 b = gfc_is_proc_ptr_comp (e, &comp);
5498 /* Convert to EXPR_FUNCTION. */
5499 e->expr_type = EXPR_FUNCTION;
5500 e->value.function.isym = NULL;
5501 e->value.function.actual = e->value.compcall.actual;
5503 if (comp->as != NULL)
5504 e->rank = comp->as->rank;
5506 if (!comp->attr.function)
5507 gfc_add_function (&comp->attr, comp->name, &e->where);
5509 if (resolve_ref (e) == FAILURE)
5512 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5513 comp->formal == NULL) == FAILURE)
5516 if (update_ppc_arglist (e) == FAILURE)
5519 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5526 gfc_is_expandable_expr (gfc_expr *e)
5528 gfc_constructor *con;
5530 if (e->expr_type == EXPR_ARRAY)
5532 /* Traverse the constructor looking for variables that are flavor
5533 parameter. Parameters must be expanded since they are fully used at
5535 for (con = e->value.constructor; con; con = con->next)
5537 if (con->expr->expr_type == EXPR_VARIABLE
5538 && con->expr->symtree
5539 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
5540 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
5542 if (con->expr->expr_type == EXPR_ARRAY
5543 && gfc_is_expandable_expr (con->expr))
5551 /* Resolve an expression. That is, make sure that types of operands agree
5552 with their operators, intrinsic operators are converted to function calls
5553 for overloaded types and unresolved function references are resolved. */
5556 gfc_resolve_expr (gfc_expr *e)
5563 switch (e->expr_type)
5566 t = resolve_operator (e);
5572 if (check_host_association (e))
5573 t = resolve_function (e);
5576 t = resolve_variable (e);
5578 expression_rank (e);
5581 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5582 && e->ref->type != REF_SUBSTRING)
5583 gfc_resolve_substring_charlen (e);
5588 if (e->symtree && e->symtree->n.sym->ts.type == BT_CLASS)
5589 t = resolve_class_compcall (e);
5591 t = resolve_compcall (e, true);
5594 case EXPR_SUBSTRING:
5595 t = resolve_ref (e);
5604 t = resolve_expr_ppc (e);
5609 if (resolve_ref (e) == FAILURE)
5612 t = gfc_resolve_array_constructor (e);
5613 /* Also try to expand a constructor. */
5616 expression_rank (e);
5617 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
5618 gfc_expand_constructor (e);
5621 /* This provides the opportunity for the length of constructors with
5622 character valued function elements to propagate the string length
5623 to the expression. */
5624 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5626 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
5627 here rather then add a duplicate test for it above. */
5628 gfc_expand_constructor (e);
5629 t = gfc_resolve_character_array_constructor (e);
5634 case EXPR_STRUCTURE:
5635 t = resolve_ref (e);
5639 t = resolve_structure_cons (e);
5643 t = gfc_simplify_expr (e, 0);
5647 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5650 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5657 /* Resolve an expression from an iterator. They must be scalar and have
5658 INTEGER or (optionally) REAL type. */
5661 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5662 const char *name_msgid)
5664 if (gfc_resolve_expr (expr) == FAILURE)
5667 if (expr->rank != 0)
5669 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5673 if (expr->ts.type != BT_INTEGER)
5675 if (expr->ts.type == BT_REAL)
5678 return gfc_notify_std (GFC_STD_F95_DEL,
5679 "Deleted feature: %s at %L must be integer",
5680 _(name_msgid), &expr->where);
5683 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5690 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5698 /* Resolve the expressions in an iterator structure. If REAL_OK is
5699 false allow only INTEGER type iterators, otherwise allow REAL types. */
5702 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5704 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5708 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5710 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5715 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5716 "Start expression in DO loop") == FAILURE)
5719 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5720 "End expression in DO loop") == FAILURE)
5723 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5724 "Step expression in DO loop") == FAILURE)
5727 if (iter->step->expr_type == EXPR_CONSTANT)
5729 if ((iter->step->ts.type == BT_INTEGER
5730 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5731 || (iter->step->ts.type == BT_REAL
5732 && mpfr_sgn (iter->step->value.real) == 0))
5734 gfc_error ("Step expression in DO loop at %L cannot be zero",
5735 &iter->step->where);
5740 /* Convert start, end, and step to the same type as var. */
5741 if (iter->start->ts.kind != iter->var->ts.kind
5742 || iter->start->ts.type != iter->var->ts.type)
5743 gfc_convert_type (iter->start, &iter->var->ts, 2);
5745 if (iter->end->ts.kind != iter->var->ts.kind
5746 || iter->end->ts.type != iter->var->ts.type)
5747 gfc_convert_type (iter->end, &iter->var->ts, 2);
5749 if (iter->step->ts.kind != iter->var->ts.kind
5750 || iter->step->ts.type != iter->var->ts.type)
5751 gfc_convert_type (iter->step, &iter->var->ts, 2);
5753 if (iter->start->expr_type == EXPR_CONSTANT
5754 && iter->end->expr_type == EXPR_CONSTANT
5755 && iter->step->expr_type == EXPR_CONSTANT)
5758 if (iter->start->ts.type == BT_INTEGER)
5760 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5761 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5765 sgn = mpfr_sgn (iter->step->value.real);
5766 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5768 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5769 gfc_warning ("DO loop at %L will be executed zero times",
5770 &iter->step->where);
5777 /* Traversal function for find_forall_index. f == 2 signals that
5778 that variable itself is not to be checked - only the references. */
5781 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5783 if (expr->expr_type != EXPR_VARIABLE)
5786 /* A scalar assignment */
5787 if (!expr->ref || *f == 1)
5789 if (expr->symtree->n.sym == sym)
5801 /* Check whether the FORALL index appears in the expression or not.
5802 Returns SUCCESS if SYM is found in EXPR. */
5805 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5807 if (gfc_traverse_expr (expr, sym, forall_index, f))
5814 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5815 to be a scalar INTEGER variable. The subscripts and stride are scalar
5816 INTEGERs, and if stride is a constant it must be nonzero.
5817 Furthermore "A subscript or stride in a forall-triplet-spec shall
5818 not contain a reference to any index-name in the
5819 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5822 resolve_forall_iterators (gfc_forall_iterator *it)
5824 gfc_forall_iterator *iter, *iter2;
5826 for (iter = it; iter; iter = iter->next)
5828 if (gfc_resolve_expr (iter->var) == SUCCESS
5829 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5830 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5833 if (gfc_resolve_expr (iter->start) == SUCCESS
5834 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5835 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5836 &iter->start->where);
5837 if (iter->var->ts.kind != iter->start->ts.kind)
5838 gfc_convert_type (iter->start, &iter->var->ts, 2);
5840 if (gfc_resolve_expr (iter->end) == SUCCESS
5841 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5842 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5844 if (iter->var->ts.kind != iter->end->ts.kind)
5845 gfc_convert_type (iter->end, &iter->var->ts, 2);
5847 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5849 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5850 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5851 &iter->stride->where, "INTEGER");
5853 if (iter->stride->expr_type == EXPR_CONSTANT
5854 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5855 gfc_error ("FORALL stride expression at %L cannot be zero",
5856 &iter->stride->where);
5858 if (iter->var->ts.kind != iter->stride->ts.kind)
5859 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5862 for (iter = it; iter; iter = iter->next)
5863 for (iter2 = iter; iter2; iter2 = iter2->next)
5865 if (find_forall_index (iter2->start,
5866 iter->var->symtree->n.sym, 0) == SUCCESS
5867 || find_forall_index (iter2->end,
5868 iter->var->symtree->n.sym, 0) == SUCCESS
5869 || find_forall_index (iter2->stride,
5870 iter->var->symtree->n.sym, 0) == SUCCESS)
5871 gfc_error ("FORALL index '%s' may not appear in triplet "
5872 "specification at %L", iter->var->symtree->name,
5873 &iter2->start->where);
5878 /* Given a pointer to a symbol that is a derived type, see if it's
5879 inaccessible, i.e. if it's defined in another module and the components are
5880 PRIVATE. The search is recursive if necessary. Returns zero if no
5881 inaccessible components are found, nonzero otherwise. */
5884 derived_inaccessible (gfc_symbol *sym)
5888 if (sym->attr.use_assoc && sym->attr.private_comp)
5891 for (c = sym->components; c; c = c->next)
5893 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
5901 /* Resolve the argument of a deallocate expression. The expression must be
5902 a pointer or a full array. */
5905 resolve_deallocate_expr (gfc_expr *e)
5907 symbol_attribute attr;
5908 int allocatable, pointer, check_intent_in;
5913 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5914 check_intent_in = 1;
5916 if (gfc_resolve_expr (e) == FAILURE)
5919 if (e->expr_type != EXPR_VARIABLE)
5922 sym = e->symtree->n.sym;
5924 if (sym->ts.type == BT_CLASS)
5926 allocatable = sym->ts.u.derived->components->attr.allocatable;
5927 pointer = sym->ts.u.derived->components->attr.pointer;
5931 allocatable = sym->attr.allocatable;
5932 pointer = sym->attr.pointer;
5934 for (ref = e->ref; ref; ref = ref->next)
5937 check_intent_in = 0;
5942 if (ref->u.ar.type != AR_FULL)
5947 c = ref->u.c.component;
5948 if (c->ts.type == BT_CLASS)
5950 allocatable = c->ts.u.derived->components->attr.allocatable;
5951 pointer = c->ts.u.derived->components->attr.pointer;
5955 allocatable = c->attr.allocatable;
5956 pointer = c->attr.pointer;
5966 attr = gfc_expr_attr (e);
5968 if (allocatable == 0 && attr.pointer == 0)
5971 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5975 if (check_intent_in && sym->attr.intent == INTENT_IN)
5977 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5978 sym->name, &e->where);
5982 if (e->ts.type == BT_CLASS)
5984 /* Only deallocate the DATA component. */
5985 gfc_add_component_ref (e, "$data");
5992 /* Returns true if the expression e contains a reference to the symbol sym. */
5994 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5996 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6003 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6005 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6009 /* Given the expression node e for an allocatable/pointer of derived type to be
6010 allocated, get the expression node to be initialized afterwards (needed for
6011 derived types with default initializers, and derived types with allocatable
6012 components that need nullification.) */
6015 gfc_expr_to_initialize (gfc_expr *e)
6021 result = gfc_copy_expr (e);
6023 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6024 for (ref = result->ref; ref; ref = ref->next)
6025 if (ref->type == REF_ARRAY && ref->next == NULL)
6027 ref->u.ar.type = AR_FULL;
6029 for (i = 0; i < ref->u.ar.dimen; i++)
6030 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6032 result->rank = ref->u.ar.dimen;
6040 /* Used in resolve_allocate_expr to check that a allocation-object and
6041 a source-expr are conformable. This does not catch all possible
6042 cases; in particular a runtime checking is needed. */
6045 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6047 /* First compare rank. */
6048 if (e2->ref && e1->rank != e2->ref->u.ar.as->rank)
6050 gfc_error ("Source-expr at %L must be scalar or have the "
6051 "same rank as the allocate-object at %L",
6052 &e1->where, &e2->where);
6063 for (i = 0; i < e1->rank; i++)
6065 if (e2->ref->u.ar.end[i])
6067 mpz_set (s, e2->ref->u.ar.end[i]->value.integer);
6068 mpz_sub (s, s, e2->ref->u.ar.start[i]->value.integer);
6069 mpz_add_ui (s, s, 1);
6073 mpz_set (s, e2->ref->u.ar.start[i]->value.integer);
6076 if (mpz_cmp (e1->shape[i], s) != 0)
6078 gfc_error ("Source-expr at %L and allocate-object at %L must "
6079 "have the same shape", &e1->where, &e2->where);
6092 /* Resolve the expression in an ALLOCATE statement, doing the additional
6093 checks to see whether the expression is OK or not. The expression must
6094 have a trailing array reference that gives the size of the array. */
6097 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6099 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6100 symbol_attribute attr;
6101 gfc_ref *ref, *ref2;
6108 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6109 check_intent_in = 1;
6111 if (gfc_resolve_expr (e) == FAILURE)
6114 /* Make sure the expression is allocatable or a pointer. If it is
6115 pointer, the next-to-last reference must be a pointer. */
6119 sym = e->symtree->n.sym;
6121 /* Check whether ultimate component is abstract and CLASS. */
6124 if (e->expr_type != EXPR_VARIABLE)
6127 attr = gfc_expr_attr (e);
6128 pointer = attr.pointer;
6129 dimension = attr.dimension;
6133 if (sym->ts.type == BT_CLASS)
6135 allocatable = sym->ts.u.derived->components->attr.allocatable;
6136 pointer = sym->ts.u.derived->components->attr.pointer;
6137 dimension = sym->ts.u.derived->components->attr.dimension;
6138 is_abstract = sym->ts.u.derived->components->attr.abstract;
6142 allocatable = sym->attr.allocatable;
6143 pointer = sym->attr.pointer;
6144 dimension = sym->attr.dimension;
6147 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6150 check_intent_in = 0;
6155 if (ref->next != NULL)
6160 c = ref->u.c.component;
6161 if (c->ts.type == BT_CLASS)
6163 allocatable = c->ts.u.derived->components->attr.allocatable;
6164 pointer = c->ts.u.derived->components->attr.pointer;
6165 dimension = c->ts.u.derived->components->attr.dimension;
6166 is_abstract = c->ts.u.derived->components->attr.abstract;
6170 allocatable = c->attr.allocatable;
6171 pointer = c->attr.pointer;
6172 dimension = c->attr.dimension;
6173 is_abstract = c->attr.abstract;
6185 if (allocatable == 0 && pointer == 0)
6187 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6192 /* Some checks for the SOURCE tag. */
6195 /* Check F03:C631. */
6196 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6198 gfc_error ("Type of entity at %L is type incompatible with "
6199 "source-expr at %L", &e->where, &code->expr3->where);
6203 /* Check F03:C632 and restriction following Note 6.18. */
6204 if (code->expr3->rank > 0
6205 && conformable_arrays (code->expr3, e) == FAILURE)
6208 /* Check F03:C633. */
6209 if (code->expr3->ts.kind != e->ts.kind)
6211 gfc_error ("The allocate-object at %L and the source-expr at %L "
6212 "shall have the same kind type parameter",
6213 &e->where, &code->expr3->where);
6217 else if (is_abstract&& code->ext.alloc.ts.type == BT_UNKNOWN)
6219 gcc_assert (e->ts.type == BT_CLASS);
6220 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6221 "type-spec or SOURCE=", sym->name, &e->where);
6225 if (check_intent_in && sym->attr.intent == INTENT_IN)
6227 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6228 sym->name, &e->where);
6234 /* Add default initializer for those derived types that need them. */
6235 if (e->ts.type == BT_DERIVED
6236 && (init_e = gfc_default_initializer (&e->ts)))
6238 gfc_code *init_st = gfc_get_code ();
6239 init_st->loc = code->loc;
6240 init_st->op = EXEC_INIT_ASSIGN;
6241 init_st->expr1 = gfc_expr_to_initialize (e);
6242 init_st->expr2 = init_e;
6243 init_st->next = code->next;
6244 code->next = init_st;
6246 else if (e->ts.type == BT_CLASS
6247 && ((code->ext.alloc.ts.type == BT_UNKNOWN
6248 && (init_e = gfc_default_initializer (&e->ts.u.derived->components->ts)))
6249 || (code->ext.alloc.ts.type == BT_DERIVED
6250 && (init_e = gfc_default_initializer (&code->ext.alloc.ts)))))
6252 gfc_code *init_st = gfc_get_code ();
6253 init_st->loc = code->loc;
6254 init_st->op = EXEC_INIT_ASSIGN;
6255 init_st->expr1 = gfc_expr_to_initialize (e);
6256 init_st->expr2 = init_e;
6257 init_st->next = code->next;
6258 code->next = init_st;
6262 if (pointer || dimension == 0)
6265 /* Make sure the next-to-last reference node is an array specification. */
6267 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
6269 gfc_error ("Array specification required in ALLOCATE statement "
6270 "at %L", &e->where);
6274 /* Make sure that the array section reference makes sense in the
6275 context of an ALLOCATE specification. */
6279 for (i = 0; i < ar->dimen; i++)
6281 if (ref2->u.ar.type == AR_ELEMENT)
6284 switch (ar->dimen_type[i])
6290 if (ar->start[i] != NULL
6291 && ar->end[i] != NULL
6292 && ar->stride[i] == NULL)
6295 /* Fall Through... */
6299 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6306 for (a = code->ext.alloc.list; a; a = a->next)
6308 sym = a->expr->symtree->n.sym;
6310 /* TODO - check derived type components. */
6311 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6314 if ((ar->start[i] != NULL
6315 && gfc_find_sym_in_expr (sym, ar->start[i]))
6316 || (ar->end[i] != NULL
6317 && gfc_find_sym_in_expr (sym, ar->end[i])))
6319 gfc_error ("'%s' must not appear in the array specification at "
6320 "%L in the same ALLOCATE statement where it is "
6321 "itself allocated", sym->name, &ar->where);
6331 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6333 gfc_expr *stat, *errmsg, *pe, *qe;
6334 gfc_alloc *a, *p, *q;
6336 stat = code->expr1 ? code->expr1 : NULL;
6338 errmsg = code->expr2 ? code->expr2 : NULL;
6340 /* Check the stat variable. */
6343 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6344 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6345 stat->symtree->n.sym->name, &stat->where);
6347 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6348 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6351 if ((stat->ts.type != BT_INTEGER
6352 && !(stat->ref && (stat->ref->type == REF_ARRAY
6353 || stat->ref->type == REF_COMPONENT)))
6355 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6356 "variable", &stat->where);
6358 for (p = code->ext.alloc.list; p; p = p->next)
6359 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6360 gfc_error ("Stat-variable at %L shall not be %sd within "
6361 "the same %s statement", &stat->where, fcn, fcn);
6364 /* Check the errmsg variable. */
6368 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6371 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6372 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6373 errmsg->symtree->n.sym->name, &errmsg->where);
6375 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6376 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6379 if ((errmsg->ts.type != BT_CHARACTER
6381 && (errmsg->ref->type == REF_ARRAY
6382 || errmsg->ref->type == REF_COMPONENT)))
6383 || errmsg->rank > 0 )
6384 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6385 "variable", &errmsg->where);
6387 for (p = code->ext.alloc.list; p; p = p->next)
6388 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6389 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6390 "the same %s statement", &errmsg->where, fcn, fcn);
6393 /* Check that an allocate-object appears only once in the statement.
6394 FIXME: Checking derived types is disabled. */
6395 for (p = code->ext.alloc.list; p; p = p->next)
6398 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6399 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6401 for (q = p->next; q; q = q->next)
6404 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6405 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6406 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6407 gfc_error ("Allocate-object at %L also appears at %L",
6408 &pe->where, &qe->where);
6413 if (strcmp (fcn, "ALLOCATE") == 0)
6415 for (a = code->ext.alloc.list; a; a = a->next)
6416 resolve_allocate_expr (a->expr, code);
6420 for (a = code->ext.alloc.list; a; a = a->next)
6421 resolve_deallocate_expr (a->expr);
6426 /************ SELECT CASE resolution subroutines ************/
6428 /* Callback function for our mergesort variant. Determines interval
6429 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6430 op1 > op2. Assumes we're not dealing with the default case.
6431 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6432 There are nine situations to check. */
6435 compare_cases (const gfc_case *op1, const gfc_case *op2)
6439 if (op1->low == NULL) /* op1 = (:L) */
6441 /* op2 = (:N), so overlap. */
6443 /* op2 = (M:) or (M:N), L < M */
6444 if (op2->low != NULL
6445 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6448 else if (op1->high == NULL) /* op1 = (K:) */
6450 /* op2 = (M:), so overlap. */
6452 /* op2 = (:N) or (M:N), K > N */
6453 if (op2->high != NULL
6454 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6457 else /* op1 = (K:L) */
6459 if (op2->low == NULL) /* op2 = (:N), K > N */
6460 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6462 else if (op2->high == NULL) /* op2 = (M:), L < M */
6463 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6465 else /* op2 = (M:N) */
6469 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6472 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6481 /* Merge-sort a double linked case list, detecting overlap in the
6482 process. LIST is the head of the double linked case list before it
6483 is sorted. Returns the head of the sorted list if we don't see any
6484 overlap, or NULL otherwise. */
6487 check_case_overlap (gfc_case *list)
6489 gfc_case *p, *q, *e, *tail;
6490 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6492 /* If the passed list was empty, return immediately. */
6499 /* Loop unconditionally. The only exit from this loop is a return
6500 statement, when we've finished sorting the case list. */
6507 /* Count the number of merges we do in this pass. */
6510 /* Loop while there exists a merge to be done. */
6515 /* Count this merge. */
6518 /* Cut the list in two pieces by stepping INSIZE places
6519 forward in the list, starting from P. */
6522 for (i = 0; i < insize; i++)
6531 /* Now we have two lists. Merge them! */
6532 while (psize > 0 || (qsize > 0 && q != NULL))
6534 /* See from which the next case to merge comes from. */
6537 /* P is empty so the next case must come from Q. */
6542 else if (qsize == 0 || q == NULL)
6551 cmp = compare_cases (p, q);
6554 /* The whole case range for P is less than the
6562 /* The whole case range for Q is greater than
6563 the case range for P. */
6570 /* The cases overlap, or they are the same
6571 element in the list. Either way, we must
6572 issue an error and get the next case from P. */
6573 /* FIXME: Sort P and Q by line number. */
6574 gfc_error ("CASE label at %L overlaps with CASE "
6575 "label at %L", &p->where, &q->where);
6583 /* Add the next element to the merged list. */
6592 /* P has now stepped INSIZE places along, and so has Q. So
6593 they're the same. */
6598 /* If we have done only one merge or none at all, we've
6599 finished sorting the cases. */
6608 /* Otherwise repeat, merging lists twice the size. */
6614 /* Check to see if an expression is suitable for use in a CASE statement.
6615 Makes sure that all case expressions are scalar constants of the same
6616 type. Return FAILURE if anything is wrong. */
6619 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6621 if (e == NULL) return SUCCESS;
6623 if (e->ts.type != case_expr->ts.type)
6625 gfc_error ("Expression in CASE statement at %L must be of type %s",
6626 &e->where, gfc_basic_typename (case_expr->ts.type));
6630 /* C805 (R808) For a given case-construct, each case-value shall be of
6631 the same type as case-expr. For character type, length differences
6632 are allowed, but the kind type parameters shall be the same. */
6634 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6636 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6637 &e->where, case_expr->ts.kind);
6641 /* Convert the case value kind to that of case expression kind, if needed.
6642 FIXME: Should a warning be issued? */
6643 if (e->ts.kind != case_expr->ts.kind)
6644 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6648 gfc_error ("Expression in CASE statement at %L must be scalar",
6657 /* Given a completely parsed select statement, we:
6659 - Validate all expressions and code within the SELECT.
6660 - Make sure that the selection expression is not of the wrong type.
6661 - Make sure that no case ranges overlap.
6662 - Eliminate unreachable cases and unreachable code resulting from
6663 removing case labels.
6665 The standard does allow unreachable cases, e.g. CASE (5:3). But
6666 they are a hassle for code generation, and to prevent that, we just
6667 cut them out here. This is not necessary for overlapping cases
6668 because they are illegal and we never even try to generate code.
6670 We have the additional caveat that a SELECT construct could have
6671 been a computed GOTO in the source code. Fortunately we can fairly
6672 easily work around that here: The case_expr for a "real" SELECT CASE
6673 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6674 we have to do is make sure that the case_expr is a scalar integer
6678 resolve_select (gfc_code *code)
6681 gfc_expr *case_expr;
6682 gfc_case *cp, *default_case, *tail, *head;
6683 int seen_unreachable;
6689 if (code->expr1 == NULL)
6691 /* This was actually a computed GOTO statement. */
6692 case_expr = code->expr2;
6693 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6694 gfc_error ("Selection expression in computed GOTO statement "
6695 "at %L must be a scalar integer expression",
6698 /* Further checking is not necessary because this SELECT was built
6699 by the compiler, so it should always be OK. Just move the
6700 case_expr from expr2 to expr so that we can handle computed
6701 GOTOs as normal SELECTs from here on. */
6702 code->expr1 = code->expr2;
6707 case_expr = code->expr1;
6709 type = case_expr->ts.type;
6710 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6712 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6713 &case_expr->where, gfc_typename (&case_expr->ts));
6715 /* Punt. Going on here just produce more garbage error messages. */
6719 if (case_expr->rank != 0)
6721 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6722 "expression", &case_expr->where);
6728 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6729 of the SELECT CASE expression and its CASE values. Walk the lists
6730 of case values, and if we find a mismatch, promote case_expr to
6731 the appropriate kind. */
6733 if (type == BT_LOGICAL || type == BT_INTEGER)
6735 for (body = code->block; body; body = body->block)
6737 /* Walk the case label list. */
6738 for (cp = body->ext.case_list; cp; cp = cp->next)
6740 /* Intercept the DEFAULT case. It does not have a kind. */
6741 if (cp->low == NULL && cp->high == NULL)
6744 /* Unreachable case ranges are discarded, so ignore. */
6745 if (cp->low != NULL && cp->high != NULL
6746 && cp->low != cp->high
6747 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6750 /* FIXME: Should a warning be issued? */
6752 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6753 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6755 if (cp->high != NULL
6756 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6757 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6762 /* Assume there is no DEFAULT case. */
6763 default_case = NULL;
6768 for (body = code->block; body; body = body->block)
6770 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6772 seen_unreachable = 0;
6774 /* Walk the case label list, making sure that all case labels
6776 for (cp = body->ext.case_list; cp; cp = cp->next)
6778 /* Count the number of cases in the whole construct. */
6781 /* Intercept the DEFAULT case. */
6782 if (cp->low == NULL && cp->high == NULL)
6784 if (default_case != NULL)
6786 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6787 "by a second DEFAULT CASE at %L",
6788 &default_case->where, &cp->where);
6799 /* Deal with single value cases and case ranges. Errors are
6800 issued from the validation function. */
6801 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
6802 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
6808 if (type == BT_LOGICAL
6809 && ((cp->low == NULL || cp->high == NULL)
6810 || cp->low != cp->high))
6812 gfc_error ("Logical range in CASE statement at %L is not "
6813 "allowed", &cp->low->where);
6818 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
6821 value = cp->low->value.logical == 0 ? 2 : 1;
6822 if (value & seen_logical)
6824 gfc_error ("constant logical value in CASE statement "
6825 "is repeated at %L",
6830 seen_logical |= value;
6833 if (cp->low != NULL && cp->high != NULL
6834 && cp->low != cp->high
6835 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6837 if (gfc_option.warn_surprising)
6838 gfc_warning ("Range specification at %L can never "
6839 "be matched", &cp->where);
6841 cp->unreachable = 1;
6842 seen_unreachable = 1;
6846 /* If the case range can be matched, it can also overlap with
6847 other cases. To make sure it does not, we put it in a
6848 double linked list here. We sort that with a merge sort
6849 later on to detect any overlapping cases. */
6853 head->right = head->left = NULL;
6858 tail->right->left = tail;
6865 /* It there was a failure in the previous case label, give up
6866 for this case label list. Continue with the next block. */
6870 /* See if any case labels that are unreachable have been seen.
6871 If so, we eliminate them. This is a bit of a kludge because
6872 the case lists for a single case statement (label) is a
6873 single forward linked lists. */
6874 if (seen_unreachable)
6876 /* Advance until the first case in the list is reachable. */
6877 while (body->ext.case_list != NULL
6878 && body->ext.case_list->unreachable)
6880 gfc_case *n = body->ext.case_list;
6881 body->ext.case_list = body->ext.case_list->next;
6883 gfc_free_case_list (n);
6886 /* Strip all other unreachable cases. */
6887 if (body->ext.case_list)
6889 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6891 if (cp->next->unreachable)
6893 gfc_case *n = cp->next;
6894 cp->next = cp->next->next;
6896 gfc_free_case_list (n);
6903 /* See if there were overlapping cases. If the check returns NULL,
6904 there was overlap. In that case we don't do anything. If head
6905 is non-NULL, we prepend the DEFAULT case. The sorted list can
6906 then used during code generation for SELECT CASE constructs with
6907 a case expression of a CHARACTER type. */
6910 head = check_case_overlap (head);
6912 /* Prepend the default_case if it is there. */
6913 if (head != NULL && default_case)
6915 default_case->left = NULL;
6916 default_case->right = head;
6917 head->left = default_case;
6921 /* Eliminate dead blocks that may be the result if we've seen
6922 unreachable case labels for a block. */
6923 for (body = code; body && body->block; body = body->block)
6925 if (body->block->ext.case_list == NULL)
6927 /* Cut the unreachable block from the code chain. */
6928 gfc_code *c = body->block;
6929 body->block = c->block;
6931 /* Kill the dead block, but not the blocks below it. */
6933 gfc_free_statements (c);
6937 /* More than two cases is legal but insane for logical selects.
6938 Issue a warning for it. */
6939 if (gfc_option.warn_surprising && type == BT_LOGICAL
6941 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6946 /* Check if a derived type is extensible. */
6949 gfc_type_is_extensible (gfc_symbol *sym)
6951 return !(sym->attr.is_bind_c || sym->attr.sequence);
6955 /* Resolve a SELECT TYPE statement. */
6958 resolve_select_type (gfc_code *code)
6960 gfc_symbol *selector_type;
6961 gfc_code *body, *new_st, *if_st, *tail;
6962 gfc_code *class_is = NULL, *default_case = NULL;
6965 char name[GFC_MAX_SYMBOL_LEN];
6973 selector_type = code->expr2->ts.u.derived->components->ts.u.derived;
6975 selector_type = code->expr1->ts.u.derived->components->ts.u.derived;
6977 /* Loop over TYPE IS / CLASS IS cases. */
6978 for (body = code->block; body; body = body->block)
6980 c = body->ext.case_list;
6982 /* Check F03:C815. */
6983 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6984 && !gfc_type_is_extensible (c->ts.u.derived))
6986 gfc_error ("Derived type '%s' at %L must be extensible",
6987 c->ts.u.derived->name, &c->where);
6992 /* Check F03:C816. */
6993 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6994 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
6996 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
6997 c->ts.u.derived->name, &c->where, selector_type->name);
7002 /* Intercept the DEFAULT case. */
7003 if (c->ts.type == BT_UNKNOWN)
7005 /* Check F03:C818. */
7008 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7009 "by a second DEFAULT CASE at %L",
7010 &default_case->ext.case_list->where, &c->where);
7015 default_case = body;
7024 /* Insert assignment for selector variable. */
7025 new_st = gfc_get_code ();
7026 new_st->op = EXEC_ASSIGN;
7027 new_st->expr1 = gfc_copy_expr (code->expr1);
7028 new_st->expr2 = gfc_copy_expr (code->expr2);
7032 /* Put SELECT TYPE statement inside a BLOCK. */
7033 new_st = gfc_get_code ();
7034 new_st->op = code->op;
7035 new_st->expr1 = code->expr1;
7036 new_st->expr2 = code->expr2;
7037 new_st->block = code->block;
7041 ns->code->next = new_st;
7042 code->op = EXEC_BLOCK;
7043 code->expr1 = code->expr2 = NULL;
7048 /* Transform to EXEC_SELECT. */
7049 code->op = EXEC_SELECT;
7050 gfc_add_component_ref (code->expr1, "$vptr");
7051 gfc_add_component_ref (code->expr1, "$hash");
7053 /* Loop over TYPE IS / CLASS IS cases. */
7054 for (body = code->block; body; body = body->block)
7056 c = body->ext.case_list;
7058 if (c->ts.type == BT_DERIVED)
7059 c->low = c->high = gfc_int_expr (c->ts.u.derived->hash_value);
7060 else if (c->ts.type == BT_UNKNOWN)
7063 /* Assign temporary to selector. */
7064 if (c->ts.type == BT_CLASS)
7065 sprintf (name, "tmp$class$%s", c->ts.u.derived->name);
7067 sprintf (name, "tmp$type$%s", c->ts.u.derived->name);
7068 st = gfc_find_symtree (ns->sym_root, name);
7069 new_st = gfc_get_code ();
7070 new_st->expr1 = gfc_get_variable_expr (st);
7071 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
7072 if (c->ts.type == BT_DERIVED)
7074 new_st->op = EXEC_POINTER_ASSIGN;
7075 gfc_add_component_ref (new_st->expr2, "$data");
7078 new_st->op = EXEC_POINTER_ASSIGN;
7079 new_st->next = body->next;
7080 body->next = new_st;
7083 /* Take out CLASS IS cases for separate treatment. */
7085 while (body && body->block)
7087 if (body->block->ext.case_list->ts.type == BT_CLASS)
7089 /* Add to class_is list. */
7090 if (class_is == NULL)
7092 class_is = body->block;
7097 for (tail = class_is; tail->block; tail = tail->block) ;
7098 tail->block = body->block;
7101 /* Remove from EXEC_SELECT list. */
7102 body->block = body->block->block;
7115 /* Add a default case to hold the CLASS IS cases. */
7116 for (tail = code; tail->block; tail = tail->block) ;
7117 tail->block = gfc_get_code ();
7119 tail->op = EXEC_SELECT_TYPE;
7120 tail->ext.case_list = gfc_get_case ();
7121 tail->ext.case_list->ts.type = BT_UNKNOWN;
7123 default_case = tail;
7126 /* More than one CLASS IS block? */
7127 if (class_is->block)
7131 /* Sort CLASS IS blocks by extension level. */
7135 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7138 /* F03:C817 (check for doubles). */
7139 if ((*c1)->ext.case_list->ts.u.derived->hash_value
7140 == c2->ext.case_list->ts.u.derived->hash_value)
7142 gfc_error ("Double CLASS IS block in SELECT TYPE "
7143 "statement at %L", &c2->ext.case_list->where);
7146 if ((*c1)->ext.case_list->ts.u.derived->attr.extension
7147 < c2->ext.case_list->ts.u.derived->attr.extension)
7150 (*c1)->block = c2->block;
7160 /* Generate IF chain. */
7161 if_st = gfc_get_code ();
7162 if_st->op = EXEC_IF;
7164 for (body = class_is; body; body = body->block)
7166 new_st->block = gfc_get_code ();
7167 new_st = new_st->block;
7168 new_st->op = EXEC_IF;
7169 /* Set up IF condition: Call _gfortran_is_extension_of. */
7170 new_st->expr1 = gfc_get_expr ();
7171 new_st->expr1->expr_type = EXPR_FUNCTION;
7172 new_st->expr1->ts.type = BT_LOGICAL;
7173 new_st->expr1->ts.kind = 4;
7174 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
7175 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
7176 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
7177 /* Set up arguments. */
7178 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
7179 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
7180 gfc_add_component_ref (new_st->expr1->value.function.actual->expr, "$vptr");
7181 vtab = gfc_find_derived_vtab (body->ext.case_list->ts.u.derived);
7182 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
7183 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
7184 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
7185 new_st->next = body->next;
7187 if (default_case->next)
7189 new_st->block = gfc_get_code ();
7190 new_st = new_st->block;
7191 new_st->op = EXEC_IF;
7192 new_st->next = default_case->next;
7195 /* Replace CLASS DEFAULT code by the IF chain. */
7196 default_case->next = if_st;
7199 resolve_select (code);
7204 /* Resolve a transfer statement. This is making sure that:
7205 -- a derived type being transferred has only non-pointer components
7206 -- a derived type being transferred doesn't have private components, unless
7207 it's being transferred from the module where the type was defined
7208 -- we're not trying to transfer a whole assumed size array. */
7211 resolve_transfer (gfc_code *code)
7220 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
7223 sym = exp->symtree->n.sym;
7226 /* Go to actual component transferred. */
7227 for (ref = code->expr1->ref; ref; ref = ref->next)
7228 if (ref->type == REF_COMPONENT)
7229 ts = &ref->u.c.component->ts;
7231 if (ts->type == BT_DERIVED)
7233 /* Check that transferred derived type doesn't contain POINTER
7235 if (ts->u.derived->attr.pointer_comp)
7237 gfc_error ("Data transfer element at %L cannot have "
7238 "POINTER components", &code->loc);
7242 if (ts->u.derived->attr.alloc_comp)
7244 gfc_error ("Data transfer element at %L cannot have "
7245 "ALLOCATABLE components", &code->loc);
7249 if (derived_inaccessible (ts->u.derived))
7251 gfc_error ("Data transfer element at %L cannot have "
7252 "PRIVATE components",&code->loc);
7257 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7258 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7260 gfc_error ("Data transfer element at %L cannot be a full reference to "
7261 "an assumed-size array", &code->loc);
7267 /*********** Toplevel code resolution subroutines ***********/
7269 /* Find the set of labels that are reachable from this block. We also
7270 record the last statement in each block. */
7273 find_reachable_labels (gfc_code *block)
7280 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7282 /* Collect labels in this block. We don't keep those corresponding
7283 to END {IF|SELECT}, these are checked in resolve_branch by going
7284 up through the code_stack. */
7285 for (c = block; c; c = c->next)
7287 if (c->here && c->op != EXEC_END_BLOCK)
7288 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7291 /* Merge with labels from parent block. */
7294 gcc_assert (cs_base->prev->reachable_labels);
7295 bitmap_ior_into (cs_base->reachable_labels,
7296 cs_base->prev->reachable_labels);
7300 /* Given a branch to a label, see if the branch is conforming.
7301 The code node describes where the branch is located. */
7304 resolve_branch (gfc_st_label *label, gfc_code *code)
7311 /* Step one: is this a valid branching target? */
7313 if (label->defined == ST_LABEL_UNKNOWN)
7315 gfc_error ("Label %d referenced at %L is never defined", label->value,
7320 if (label->defined != ST_LABEL_TARGET)
7322 gfc_error ("Statement at %L is not a valid branch target statement "
7323 "for the branch statement at %L", &label->where, &code->loc);
7327 /* Step two: make sure this branch is not a branch to itself ;-) */
7329 if (code->here == label)
7331 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7335 /* Step three: See if the label is in the same block as the
7336 branching statement. The hard work has been done by setting up
7337 the bitmap reachable_labels. */
7339 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7342 /* Step four: If we haven't found the label in the bitmap, it may
7343 still be the label of the END of the enclosing block, in which
7344 case we find it by going up the code_stack. */
7346 for (stack = cs_base; stack; stack = stack->prev)
7347 if (stack->current->next && stack->current->next->here == label)
7352 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7356 /* The label is not in an enclosing block, so illegal. This was
7357 allowed in Fortran 66, so we allow it as extension. No
7358 further checks are necessary in this case. */
7359 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7360 "as the GOTO statement at %L", &label->where,
7366 /* Check whether EXPR1 has the same shape as EXPR2. */
7369 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7371 mpz_t shape[GFC_MAX_DIMENSIONS];
7372 mpz_t shape2[GFC_MAX_DIMENSIONS];
7373 gfc_try result = FAILURE;
7376 /* Compare the rank. */
7377 if (expr1->rank != expr2->rank)
7380 /* Compare the size of each dimension. */
7381 for (i=0; i<expr1->rank; i++)
7383 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7386 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7389 if (mpz_cmp (shape[i], shape2[i]))
7393 /* When either of the two expression is an assumed size array, we
7394 ignore the comparison of dimension sizes. */
7399 for (i--; i >= 0; i--)
7401 mpz_clear (shape[i]);
7402 mpz_clear (shape2[i]);
7408 /* Check whether a WHERE assignment target or a WHERE mask expression
7409 has the same shape as the outmost WHERE mask expression. */
7412 resolve_where (gfc_code *code, gfc_expr *mask)
7418 cblock = code->block;
7420 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7421 In case of nested WHERE, only the outmost one is stored. */
7422 if (mask == NULL) /* outmost WHERE */
7424 else /* inner WHERE */
7431 /* Check if the mask-expr has a consistent shape with the
7432 outmost WHERE mask-expr. */
7433 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7434 gfc_error ("WHERE mask at %L has inconsistent shape",
7435 &cblock->expr1->where);
7438 /* the assignment statement of a WHERE statement, or the first
7439 statement in where-body-construct of a WHERE construct */
7440 cnext = cblock->next;
7445 /* WHERE assignment statement */
7448 /* Check shape consistent for WHERE assignment target. */
7449 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7450 gfc_error ("WHERE assignment target at %L has "
7451 "inconsistent shape", &cnext->expr1->where);
7455 case EXEC_ASSIGN_CALL:
7456 resolve_call (cnext);
7457 if (!cnext->resolved_sym->attr.elemental)
7458 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7459 &cnext->ext.actual->expr->where);
7462 /* WHERE or WHERE construct is part of a where-body-construct */
7464 resolve_where (cnext, e);
7468 gfc_error ("Unsupported statement inside WHERE at %L",
7471 /* the next statement within the same where-body-construct */
7472 cnext = cnext->next;
7474 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7475 cblock = cblock->block;
7480 /* Resolve assignment in FORALL construct.
7481 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7482 FORALL index variables. */
7485 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7489 for (n = 0; n < nvar; n++)
7491 gfc_symbol *forall_index;
7493 forall_index = var_expr[n]->symtree->n.sym;
7495 /* Check whether the assignment target is one of the FORALL index
7497 if ((code->expr1->expr_type == EXPR_VARIABLE)
7498 && (code->expr1->symtree->n.sym == forall_index))
7499 gfc_error ("Assignment to a FORALL index variable at %L",
7500 &code->expr1->where);
7503 /* If one of the FORALL index variables doesn't appear in the
7504 assignment variable, then there could be a many-to-one
7505 assignment. Emit a warning rather than an error because the
7506 mask could be resolving this problem. */
7507 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7508 gfc_warning ("The FORALL with index '%s' is not used on the "
7509 "left side of the assignment at %L and so might "
7510 "cause multiple assignment to this object",
7511 var_expr[n]->symtree->name, &code->expr1->where);
7517 /* Resolve WHERE statement in FORALL construct. */
7520 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7521 gfc_expr **var_expr)
7526 cblock = code->block;
7529 /* the assignment statement of a WHERE statement, or the first
7530 statement in where-body-construct of a WHERE construct */
7531 cnext = cblock->next;
7536 /* WHERE assignment statement */
7538 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7541 /* WHERE operator assignment statement */
7542 case EXEC_ASSIGN_CALL:
7543 resolve_call (cnext);
7544 if (!cnext->resolved_sym->attr.elemental)
7545 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7546 &cnext->ext.actual->expr->where);
7549 /* WHERE or WHERE construct is part of a where-body-construct */
7551 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7555 gfc_error ("Unsupported statement inside WHERE at %L",
7558 /* the next statement within the same where-body-construct */
7559 cnext = cnext->next;
7561 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7562 cblock = cblock->block;
7567 /* Traverse the FORALL body to check whether the following errors exist:
7568 1. For assignment, check if a many-to-one assignment happens.
7569 2. For WHERE statement, check the WHERE body to see if there is any
7570 many-to-one assignment. */
7573 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7577 c = code->block->next;
7583 case EXEC_POINTER_ASSIGN:
7584 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7587 case EXEC_ASSIGN_CALL:
7591 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7592 there is no need to handle it here. */
7596 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7601 /* The next statement in the FORALL body. */
7607 /* Counts the number of iterators needed inside a forall construct, including
7608 nested forall constructs. This is used to allocate the needed memory
7609 in gfc_resolve_forall. */
7612 gfc_count_forall_iterators (gfc_code *code)
7614 int max_iters, sub_iters, current_iters;
7615 gfc_forall_iterator *fa;
7617 gcc_assert(code->op == EXEC_FORALL);
7621 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7624 code = code->block->next;
7628 if (code->op == EXEC_FORALL)
7630 sub_iters = gfc_count_forall_iterators (code);
7631 if (sub_iters > max_iters)
7632 max_iters = sub_iters;
7637 return current_iters + max_iters;
7641 /* Given a FORALL construct, first resolve the FORALL iterator, then call
7642 gfc_resolve_forall_body to resolve the FORALL body. */
7645 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
7647 static gfc_expr **var_expr;
7648 static int total_var = 0;
7649 static int nvar = 0;
7651 gfc_forall_iterator *fa;
7656 /* Start to resolve a FORALL construct */
7657 if (forall_save == 0)
7659 /* Count the total number of FORALL index in the nested FORALL
7660 construct in order to allocate the VAR_EXPR with proper size. */
7661 total_var = gfc_count_forall_iterators (code);
7663 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
7664 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
7667 /* The information about FORALL iterator, including FORALL index start, end
7668 and stride. The FORALL index can not appear in start, end or stride. */
7669 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7671 /* Check if any outer FORALL index name is the same as the current
7673 for (i = 0; i < nvar; i++)
7675 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
7677 gfc_error ("An outer FORALL construct already has an index "
7678 "with this name %L", &fa->var->where);
7682 /* Record the current FORALL index. */
7683 var_expr[nvar] = gfc_copy_expr (fa->var);
7687 /* No memory leak. */
7688 gcc_assert (nvar <= total_var);
7691 /* Resolve the FORALL body. */
7692 gfc_resolve_forall_body (code, nvar, var_expr);
7694 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
7695 gfc_resolve_blocks (code->block, ns);
7699 /* Free only the VAR_EXPRs allocated in this frame. */
7700 for (i = nvar; i < tmp; i++)
7701 gfc_free_expr (var_expr[i]);
7705 /* We are in the outermost FORALL construct. */
7706 gcc_assert (forall_save == 0);
7708 /* VAR_EXPR is not needed any more. */
7709 gfc_free (var_expr);
7715 /* Resolve a BLOCK construct statement. */
7718 resolve_block_construct (gfc_code* code)
7720 /* Eventually, we may want to do some checks here or handle special stuff.
7721 But so far the only thing we can do is resolving the local namespace. */
7723 gfc_resolve (code->ext.ns);
7727 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
7730 static void resolve_code (gfc_code *, gfc_namespace *);
7733 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
7737 for (; b; b = b->block)
7739 t = gfc_resolve_expr (b->expr1);
7740 if (gfc_resolve_expr (b->expr2) == FAILURE)
7746 if (t == SUCCESS && b->expr1 != NULL
7747 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
7748 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7755 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
7756 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
7761 resolve_branch (b->label1, b);
7765 resolve_block_construct (b);
7769 case EXEC_SELECT_TYPE:
7779 case EXEC_OMP_ATOMIC:
7780 case EXEC_OMP_CRITICAL:
7782 case EXEC_OMP_MASTER:
7783 case EXEC_OMP_ORDERED:
7784 case EXEC_OMP_PARALLEL:
7785 case EXEC_OMP_PARALLEL_DO:
7786 case EXEC_OMP_PARALLEL_SECTIONS:
7787 case EXEC_OMP_PARALLEL_WORKSHARE:
7788 case EXEC_OMP_SECTIONS:
7789 case EXEC_OMP_SINGLE:
7791 case EXEC_OMP_TASKWAIT:
7792 case EXEC_OMP_WORKSHARE:
7796 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
7799 resolve_code (b->next, ns);
7804 /* Does everything to resolve an ordinary assignment. Returns true
7805 if this is an interface assignment. */
7807 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
7817 if (gfc_extend_assign (code, ns) == SUCCESS)
7821 if (code->op == EXEC_ASSIGN_CALL)
7823 lhs = code->ext.actual->expr;
7824 rhsptr = &code->ext.actual->next->expr;
7828 gfc_actual_arglist* args;
7829 gfc_typebound_proc* tbp;
7831 gcc_assert (code->op == EXEC_COMPCALL);
7833 args = code->expr1->value.compcall.actual;
7835 rhsptr = &args->next->expr;
7837 tbp = code->expr1->value.compcall.tbp;
7838 gcc_assert (!tbp->is_generic);
7841 /* Make a temporary rhs when there is a default initializer
7842 and rhs is the same symbol as the lhs. */
7843 if ((*rhsptr)->expr_type == EXPR_VARIABLE
7844 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
7845 && has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
7846 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
7847 *rhsptr = gfc_get_parentheses (*rhsptr);
7856 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
7857 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
7858 &code->loc) == FAILURE)
7861 /* Handle the case of a BOZ literal on the RHS. */
7862 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
7865 if (gfc_option.warn_surprising)
7866 gfc_warning ("BOZ literal at %L is bitwise transferred "
7867 "non-integer symbol '%s'", &code->loc,
7868 lhs->symtree->n.sym->name);
7870 if (!gfc_convert_boz (rhs, &lhs->ts))
7872 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
7874 if (rc == ARITH_UNDERFLOW)
7875 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
7876 ". This check can be disabled with the option "
7877 "-fno-range-check", &rhs->where);
7878 else if (rc == ARITH_OVERFLOW)
7879 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
7880 ". This check can be disabled with the option "
7881 "-fno-range-check", &rhs->where);
7882 else if (rc == ARITH_NAN)
7883 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
7884 ". This check can be disabled with the option "
7885 "-fno-range-check", &rhs->where);
7891 if (lhs->ts.type == BT_CHARACTER
7892 && gfc_option.warn_character_truncation)
7894 if (lhs->ts.u.cl != NULL
7895 && lhs->ts.u.cl->length != NULL
7896 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7897 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
7899 if (rhs->expr_type == EXPR_CONSTANT)
7900 rlen = rhs->value.character.length;
7902 else if (rhs->ts.u.cl != NULL
7903 && rhs->ts.u.cl->length != NULL
7904 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7905 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
7907 if (rlen && llen && rlen > llen)
7908 gfc_warning_now ("CHARACTER expression will be truncated "
7909 "in assignment (%d/%d) at %L",
7910 llen, rlen, &code->loc);
7913 /* Ensure that a vector index expression for the lvalue is evaluated
7914 to a temporary if the lvalue symbol is referenced in it. */
7917 for (ref = lhs->ref; ref; ref= ref->next)
7918 if (ref->type == REF_ARRAY)
7920 for (n = 0; n < ref->u.ar.dimen; n++)
7921 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
7922 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
7923 ref->u.ar.start[n]))
7925 = gfc_get_parentheses (ref->u.ar.start[n]);
7929 if (gfc_pure (NULL))
7931 if (gfc_impure_variable (lhs->symtree->n.sym))
7933 gfc_error ("Cannot assign to variable '%s' in PURE "
7935 lhs->symtree->n.sym->name,
7940 if (lhs->ts.type == BT_DERIVED
7941 && lhs->expr_type == EXPR_VARIABLE
7942 && lhs->ts.u.derived->attr.pointer_comp
7943 && gfc_impure_variable (rhs->symtree->n.sym))
7945 gfc_error ("The impure variable at %L is assigned to "
7946 "a derived type variable with a POINTER "
7947 "component in a PURE procedure (12.6)",
7954 if (lhs->ts.type == BT_CLASS)
7956 gfc_error ("Variable must not be polymorphic in assignment at %L",
7961 gfc_check_assign (lhs, rhs, 1);
7966 /* Given a block of code, recursively resolve everything pointed to by this
7970 resolve_code (gfc_code *code, gfc_namespace *ns)
7972 int omp_workshare_save;
7977 frame.prev = cs_base;
7981 find_reachable_labels (code);
7983 for (; code; code = code->next)
7985 frame.current = code;
7986 forall_save = forall_flag;
7988 if (code->op == EXEC_FORALL)
7991 gfc_resolve_forall (code, ns, forall_save);
7994 else if (code->block)
7996 omp_workshare_save = -1;
7999 case EXEC_OMP_PARALLEL_WORKSHARE:
8000 omp_workshare_save = omp_workshare_flag;
8001 omp_workshare_flag = 1;
8002 gfc_resolve_omp_parallel_blocks (code, ns);
8004 case EXEC_OMP_PARALLEL:
8005 case EXEC_OMP_PARALLEL_DO:
8006 case EXEC_OMP_PARALLEL_SECTIONS:
8008 omp_workshare_save = omp_workshare_flag;
8009 omp_workshare_flag = 0;
8010 gfc_resolve_omp_parallel_blocks (code, ns);
8013 gfc_resolve_omp_do_blocks (code, ns);
8015 case EXEC_SELECT_TYPE:
8016 gfc_current_ns = code->ext.ns;
8017 gfc_resolve_blocks (code->block, gfc_current_ns);
8018 gfc_current_ns = ns;
8020 case EXEC_OMP_WORKSHARE:
8021 omp_workshare_save = omp_workshare_flag;
8022 omp_workshare_flag = 1;
8025 gfc_resolve_blocks (code->block, ns);
8029 if (omp_workshare_save != -1)
8030 omp_workshare_flag = omp_workshare_save;
8034 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
8035 t = gfc_resolve_expr (code->expr1);
8036 forall_flag = forall_save;
8038 if (gfc_resolve_expr (code->expr2) == FAILURE)
8041 if (code->op == EXEC_ALLOCATE
8042 && gfc_resolve_expr (code->expr3) == FAILURE)
8048 case EXEC_END_BLOCK:
8055 case EXEC_ASSIGN_CALL:
8059 /* Keep track of which entry we are up to. */
8060 current_entry_id = code->ext.entry->id;
8064 resolve_where (code, NULL);
8068 if (code->expr1 != NULL)
8070 if (code->expr1->ts.type != BT_INTEGER)
8071 gfc_error ("ASSIGNED GOTO statement at %L requires an "
8072 "INTEGER variable", &code->expr1->where);
8073 else if (code->expr1->symtree->n.sym->attr.assign != 1)
8074 gfc_error ("Variable '%s' has not been assigned a target "
8075 "label at %L", code->expr1->symtree->n.sym->name,
8076 &code->expr1->where);
8079 resolve_branch (code->label1, code);
8083 if (code->expr1 != NULL
8084 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
8085 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
8086 "INTEGER return specifier", &code->expr1->where);
8089 case EXEC_INIT_ASSIGN:
8090 case EXEC_END_PROCEDURE:
8097 if (resolve_ordinary_assign (code, ns))
8099 if (code->op == EXEC_COMPCALL)
8106 case EXEC_LABEL_ASSIGN:
8107 if (code->label1->defined == ST_LABEL_UNKNOWN)
8108 gfc_error ("Label %d referenced at %L is never defined",
8109 code->label1->value, &code->label1->where);
8111 && (code->expr1->expr_type != EXPR_VARIABLE
8112 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
8113 || code->expr1->symtree->n.sym->ts.kind
8114 != gfc_default_integer_kind
8115 || code->expr1->symtree->n.sym->as != NULL))
8116 gfc_error ("ASSIGN statement at %L requires a scalar "
8117 "default INTEGER variable", &code->expr1->where);
8120 case EXEC_POINTER_ASSIGN:
8124 gfc_check_pointer_assign (code->expr1, code->expr2);
8127 case EXEC_ARITHMETIC_IF:
8129 && code->expr1->ts.type != BT_INTEGER
8130 && code->expr1->ts.type != BT_REAL)
8131 gfc_error ("Arithmetic IF statement at %L requires a numeric "
8132 "expression", &code->expr1->where);
8134 resolve_branch (code->label1, code);
8135 resolve_branch (code->label2, code);
8136 resolve_branch (code->label3, code);
8140 if (t == SUCCESS && code->expr1 != NULL
8141 && (code->expr1->ts.type != BT_LOGICAL
8142 || code->expr1->rank != 0))
8143 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8144 &code->expr1->where);
8149 resolve_call (code);
8154 if (code->expr1->symtree
8155 && code->expr1->symtree->n.sym->ts.type == BT_CLASS)
8156 resolve_class_typebound_call (code);
8158 resolve_typebound_call (code);
8162 resolve_ppc_call (code);
8166 /* Select is complicated. Also, a SELECT construct could be
8167 a transformed computed GOTO. */
8168 resolve_select (code);
8171 case EXEC_SELECT_TYPE:
8172 resolve_select_type (code);
8176 gfc_resolve (code->ext.ns);
8180 if (code->ext.iterator != NULL)
8182 gfc_iterator *iter = code->ext.iterator;
8183 if (gfc_resolve_iterator (iter, true) != FAILURE)
8184 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
8189 if (code->expr1 == NULL)
8190 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
8192 && (code->expr1->rank != 0
8193 || code->expr1->ts.type != BT_LOGICAL))
8194 gfc_error ("Exit condition of DO WHILE loop at %L must be "
8195 "a scalar LOGICAL expression", &code->expr1->where);
8200 resolve_allocate_deallocate (code, "ALLOCATE");
8204 case EXEC_DEALLOCATE:
8206 resolve_allocate_deallocate (code, "DEALLOCATE");
8211 if (gfc_resolve_open (code->ext.open) == FAILURE)
8214 resolve_branch (code->ext.open->err, code);
8218 if (gfc_resolve_close (code->ext.close) == FAILURE)
8221 resolve_branch (code->ext.close->err, code);
8224 case EXEC_BACKSPACE:
8228 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8231 resolve_branch (code->ext.filepos->err, code);
8235 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8238 resolve_branch (code->ext.inquire->err, code);
8242 gcc_assert (code->ext.inquire != NULL);
8243 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8246 resolve_branch (code->ext.inquire->err, code);
8250 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8253 resolve_branch (code->ext.wait->err, code);
8254 resolve_branch (code->ext.wait->end, code);
8255 resolve_branch (code->ext.wait->eor, code);
8260 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8263 resolve_branch (code->ext.dt->err, code);
8264 resolve_branch (code->ext.dt->end, code);
8265 resolve_branch (code->ext.dt->eor, code);
8269 resolve_transfer (code);
8273 resolve_forall_iterators (code->ext.forall_iterator);
8275 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8276 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8277 "expression", &code->expr1->where);
8280 case EXEC_OMP_ATOMIC:
8281 case EXEC_OMP_BARRIER:
8282 case EXEC_OMP_CRITICAL:
8283 case EXEC_OMP_FLUSH:
8285 case EXEC_OMP_MASTER:
8286 case EXEC_OMP_ORDERED:
8287 case EXEC_OMP_SECTIONS:
8288 case EXEC_OMP_SINGLE:
8289 case EXEC_OMP_TASKWAIT:
8290 case EXEC_OMP_WORKSHARE:
8291 gfc_resolve_omp_directive (code, ns);
8294 case EXEC_OMP_PARALLEL:
8295 case EXEC_OMP_PARALLEL_DO:
8296 case EXEC_OMP_PARALLEL_SECTIONS:
8297 case EXEC_OMP_PARALLEL_WORKSHARE:
8299 omp_workshare_save = omp_workshare_flag;
8300 omp_workshare_flag = 0;
8301 gfc_resolve_omp_directive (code, ns);
8302 omp_workshare_flag = omp_workshare_save;
8306 gfc_internal_error ("resolve_code(): Bad statement code");
8310 cs_base = frame.prev;
8314 /* Resolve initial values and make sure they are compatible with
8318 resolve_values (gfc_symbol *sym)
8320 if (sym->value == NULL)
8323 if (gfc_resolve_expr (sym->value) == FAILURE)
8326 gfc_check_assign_symbol (sym, sym->value);
8330 /* Verify the binding labels for common blocks that are BIND(C). The label
8331 for a BIND(C) common block must be identical in all scoping units in which
8332 the common block is declared. Further, the binding label can not collide
8333 with any other global entity in the program. */
8336 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8338 if (comm_block_tree->n.common->is_bind_c == 1)
8340 gfc_gsymbol *binding_label_gsym;
8341 gfc_gsymbol *comm_name_gsym;
8343 /* See if a global symbol exists by the common block's name. It may
8344 be NULL if the common block is use-associated. */
8345 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8346 comm_block_tree->n.common->name);
8347 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8348 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8349 "with the global entity '%s' at %L",
8350 comm_block_tree->n.common->binding_label,
8351 comm_block_tree->n.common->name,
8352 &(comm_block_tree->n.common->where),
8353 comm_name_gsym->name, &(comm_name_gsym->where));
8354 else if (comm_name_gsym != NULL
8355 && strcmp (comm_name_gsym->name,
8356 comm_block_tree->n.common->name) == 0)
8358 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8360 if (comm_name_gsym->binding_label == NULL)
8361 /* No binding label for common block stored yet; save this one. */
8362 comm_name_gsym->binding_label =
8363 comm_block_tree->n.common->binding_label;
8365 if (strcmp (comm_name_gsym->binding_label,
8366 comm_block_tree->n.common->binding_label) != 0)
8368 /* Common block names match but binding labels do not. */
8369 gfc_error ("Binding label '%s' for common block '%s' at %L "
8370 "does not match the binding label '%s' for common "
8372 comm_block_tree->n.common->binding_label,
8373 comm_block_tree->n.common->name,
8374 &(comm_block_tree->n.common->where),
8375 comm_name_gsym->binding_label,
8376 comm_name_gsym->name,
8377 &(comm_name_gsym->where));
8382 /* There is no binding label (NAME="") so we have nothing further to
8383 check and nothing to add as a global symbol for the label. */
8384 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8387 binding_label_gsym =
8388 gfc_find_gsymbol (gfc_gsym_root,
8389 comm_block_tree->n.common->binding_label);
8390 if (binding_label_gsym == NULL)
8392 /* Need to make a global symbol for the binding label to prevent
8393 it from colliding with another. */
8394 binding_label_gsym =
8395 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8396 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8397 binding_label_gsym->type = GSYM_COMMON;
8401 /* If comm_name_gsym is NULL, the name common block is use
8402 associated and the name could be colliding. */
8403 if (binding_label_gsym->type != GSYM_COMMON)
8404 gfc_error ("Binding label '%s' for common block '%s' at %L "
8405 "collides with the global entity '%s' at %L",
8406 comm_block_tree->n.common->binding_label,
8407 comm_block_tree->n.common->name,
8408 &(comm_block_tree->n.common->where),
8409 binding_label_gsym->name,
8410 &(binding_label_gsym->where));
8411 else if (comm_name_gsym != NULL
8412 && (strcmp (binding_label_gsym->name,
8413 comm_name_gsym->binding_label) != 0)
8414 && (strcmp (binding_label_gsym->sym_name,
8415 comm_name_gsym->name) != 0))
8416 gfc_error ("Binding label '%s' for common block '%s' at %L "
8417 "collides with global entity '%s' at %L",
8418 binding_label_gsym->name, binding_label_gsym->sym_name,
8419 &(comm_block_tree->n.common->where),
8420 comm_name_gsym->name, &(comm_name_gsym->where));
8428 /* Verify any BIND(C) derived types in the namespace so we can report errors
8429 for them once, rather than for each variable declared of that type. */
8432 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8434 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8435 && derived_sym->attr.is_bind_c == 1)
8436 verify_bind_c_derived_type (derived_sym);
8442 /* Verify that any binding labels used in a given namespace do not collide
8443 with the names or binding labels of any global symbols. */
8446 gfc_verify_binding_labels (gfc_symbol *sym)
8450 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8451 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8453 gfc_gsymbol *bind_c_sym;
8455 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8456 if (bind_c_sym != NULL
8457 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8459 if (sym->attr.if_source == IFSRC_DECL
8460 && (bind_c_sym->type != GSYM_SUBROUTINE
8461 && bind_c_sym->type != GSYM_FUNCTION)
8462 && ((sym->attr.contained == 1
8463 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8464 || (sym->attr.use_assoc == 1
8465 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8467 /* Make sure global procedures don't collide with anything. */
8468 gfc_error ("Binding label '%s' at %L collides with the global "
8469 "entity '%s' at %L", sym->binding_label,
8470 &(sym->declared_at), bind_c_sym->name,
8471 &(bind_c_sym->where));
8474 else if (sym->attr.contained == 0
8475 && (sym->attr.if_source == IFSRC_IFBODY
8476 && sym->attr.flavor == FL_PROCEDURE)
8477 && (bind_c_sym->sym_name != NULL
8478 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8480 /* Make sure procedures in interface bodies don't collide. */
8481 gfc_error ("Binding label '%s' in interface body at %L collides "
8482 "with the global entity '%s' at %L",
8484 &(sym->declared_at), bind_c_sym->name,
8485 &(bind_c_sym->where));
8488 else if (sym->attr.contained == 0
8489 && sym->attr.if_source == IFSRC_UNKNOWN)
8490 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8491 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8492 || sym->attr.use_assoc == 0)
8494 gfc_error ("Binding label '%s' at %L collides with global "
8495 "entity '%s' at %L", sym->binding_label,
8496 &(sym->declared_at), bind_c_sym->name,
8497 &(bind_c_sym->where));
8502 /* Clear the binding label to prevent checking multiple times. */
8503 sym->binding_label[0] = '\0';
8505 else if (bind_c_sym == NULL)
8507 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8508 bind_c_sym->where = sym->declared_at;
8509 bind_c_sym->sym_name = sym->name;
8511 if (sym->attr.use_assoc == 1)
8512 bind_c_sym->mod_name = sym->module;
8514 if (sym->ns->proc_name != NULL)
8515 bind_c_sym->mod_name = sym->ns->proc_name->name;
8517 if (sym->attr.contained == 0)
8519 if (sym->attr.subroutine)
8520 bind_c_sym->type = GSYM_SUBROUTINE;
8521 else if (sym->attr.function)
8522 bind_c_sym->type = GSYM_FUNCTION;
8530 /* Resolve an index expression. */
8533 resolve_index_expr (gfc_expr *e)
8535 if (gfc_resolve_expr (e) == FAILURE)
8538 if (gfc_simplify_expr (e, 0) == FAILURE)
8541 if (gfc_specification_expr (e) == FAILURE)
8547 /* Resolve a charlen structure. */
8550 resolve_charlen (gfc_charlen *cl)
8559 specification_expr = 1;
8561 if (resolve_index_expr (cl->length) == FAILURE)
8563 specification_expr = 0;
8567 /* "If the character length parameter value evaluates to a negative
8568 value, the length of character entities declared is zero." */
8569 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8571 if (gfc_option.warn_surprising)
8572 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
8573 " the length has been set to zero",
8574 &cl->length->where, i);
8575 gfc_replace_expr (cl->length, gfc_int_expr (0));
8578 /* Check that the character length is not too large. */
8579 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8580 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8581 && cl->length->ts.type == BT_INTEGER
8582 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8584 gfc_error ("String length at %L is too large", &cl->length->where);
8592 /* Test for non-constant shape arrays. */
8595 is_non_constant_shape_array (gfc_symbol *sym)
8601 not_constant = false;
8602 if (sym->as != NULL)
8604 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
8605 has not been simplified; parameter array references. Do the
8606 simplification now. */
8607 for (i = 0; i < sym->as->rank; i++)
8609 e = sym->as->lower[i];
8610 if (e && (resolve_index_expr (e) == FAILURE
8611 || !gfc_is_constant_expr (e)))
8612 not_constant = true;
8614 e = sym->as->upper[i];
8615 if (e && (resolve_index_expr (e) == FAILURE
8616 || !gfc_is_constant_expr (e)))
8617 not_constant = true;
8620 return not_constant;
8623 /* Given a symbol and an initialization expression, add code to initialize
8624 the symbol to the function entry. */
8626 build_init_assign (gfc_symbol *sym, gfc_expr *init)
8630 gfc_namespace *ns = sym->ns;
8632 /* Search for the function namespace if this is a contained
8633 function without an explicit result. */
8634 if (sym->attr.function && sym == sym->result
8635 && sym->name != sym->ns->proc_name->name)
8638 for (;ns; ns = ns->sibling)
8639 if (strcmp (ns->proc_name->name, sym->name) == 0)
8645 gfc_free_expr (init);
8649 /* Build an l-value expression for the result. */
8650 lval = gfc_lval_expr_from_sym (sym);
8652 /* Add the code at scope entry. */
8653 init_st = gfc_get_code ();
8654 init_st->next = ns->code;
8657 /* Assign the default initializer to the l-value. */
8658 init_st->loc = sym->declared_at;
8659 init_st->op = EXEC_INIT_ASSIGN;
8660 init_st->expr1 = lval;
8661 init_st->expr2 = init;
8664 /* Assign the default initializer to a derived type variable or result. */
8667 apply_default_init (gfc_symbol *sym)
8669 gfc_expr *init = NULL;
8671 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8674 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
8675 init = gfc_default_initializer (&sym->ts);
8680 build_init_assign (sym, init);
8683 /* Build an initializer for a local integer, real, complex, logical, or
8684 character variable, based on the command line flags finit-local-zero,
8685 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
8686 null if the symbol should not have a default initialization. */
8688 build_default_init_expr (gfc_symbol *sym)
8691 gfc_expr *init_expr;
8694 /* These symbols should never have a default initialization. */
8695 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
8696 || sym->attr.external
8698 || sym->attr.pointer
8699 || sym->attr.in_equivalence
8700 || sym->attr.in_common
8703 || sym->attr.cray_pointee
8704 || sym->attr.cray_pointer)
8707 /* Now we'll try to build an initializer expression. */
8708 init_expr = gfc_get_expr ();
8709 init_expr->expr_type = EXPR_CONSTANT;
8710 init_expr->ts.type = sym->ts.type;
8711 init_expr->ts.kind = sym->ts.kind;
8712 init_expr->where = sym->declared_at;
8714 /* We will only initialize integers, reals, complex, logicals, and
8715 characters, and only if the corresponding command-line flags
8716 were set. Otherwise, we free init_expr and return null. */
8717 switch (sym->ts.type)
8720 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
8721 mpz_init_set_si (init_expr->value.integer,
8722 gfc_option.flag_init_integer_value);
8725 gfc_free_expr (init_expr);
8731 mpfr_init (init_expr->value.real);
8732 switch (gfc_option.flag_init_real)
8734 case GFC_INIT_REAL_SNAN:
8735 init_expr->is_snan = 1;
8737 case GFC_INIT_REAL_NAN:
8738 mpfr_set_nan (init_expr->value.real);
8741 case GFC_INIT_REAL_INF:
8742 mpfr_set_inf (init_expr->value.real, 1);
8745 case GFC_INIT_REAL_NEG_INF:
8746 mpfr_set_inf (init_expr->value.real, -1);
8749 case GFC_INIT_REAL_ZERO:
8750 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
8754 gfc_free_expr (init_expr);
8761 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
8762 switch (gfc_option.flag_init_real)
8764 case GFC_INIT_REAL_SNAN:
8765 init_expr->is_snan = 1;
8767 case GFC_INIT_REAL_NAN:
8768 mpfr_set_nan (mpc_realref (init_expr->value.complex));
8769 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
8772 case GFC_INIT_REAL_INF:
8773 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
8774 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
8777 case GFC_INIT_REAL_NEG_INF:
8778 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
8779 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
8782 case GFC_INIT_REAL_ZERO:
8783 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
8787 gfc_free_expr (init_expr);
8794 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
8795 init_expr->value.logical = 0;
8796 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
8797 init_expr->value.logical = 1;
8800 gfc_free_expr (init_expr);
8806 /* For characters, the length must be constant in order to
8807 create a default initializer. */
8808 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
8809 && sym->ts.u.cl->length
8810 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8812 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
8813 init_expr->value.character.length = char_len;
8814 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
8815 for (i = 0; i < char_len; i++)
8816 init_expr->value.character.string[i]
8817 = (unsigned char) gfc_option.flag_init_character_value;
8821 gfc_free_expr (init_expr);
8827 gfc_free_expr (init_expr);
8833 /* Add an initialization expression to a local variable. */
8835 apply_default_init_local (gfc_symbol *sym)
8837 gfc_expr *init = NULL;
8839 /* The symbol should be a variable or a function return value. */
8840 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8841 || (sym->attr.function && sym->result != sym))
8844 /* Try to build the initializer expression. If we can't initialize
8845 this symbol, then init will be NULL. */
8846 init = build_default_init_expr (sym);
8850 /* For saved variables, we don't want to add an initializer at
8851 function entry, so we just add a static initializer. */
8852 if (sym->attr.save || sym->ns->save_all
8853 || gfc_option.flag_max_stack_var_size == 0)
8855 /* Don't clobber an existing initializer! */
8856 gcc_assert (sym->value == NULL);
8861 build_init_assign (sym, init);
8864 /* Resolution of common features of flavors variable and procedure. */
8867 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
8869 /* Constraints on deferred shape variable. */
8870 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
8872 if (sym->attr.allocatable)
8874 if (sym->attr.dimension)
8876 gfc_error ("Allocatable array '%s' at %L must have "
8877 "a deferred shape", sym->name, &sym->declared_at);
8880 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
8881 "may not be ALLOCATABLE", sym->name,
8882 &sym->declared_at) == FAILURE)
8886 if (sym->attr.pointer && sym->attr.dimension)
8888 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
8889 sym->name, &sym->declared_at);
8896 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
8897 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
8899 gfc_error ("Array '%s' at %L cannot have a deferred shape",
8900 sym->name, &sym->declared_at);
8908 /* Additional checks for symbols with flavor variable and derived
8909 type. To be called from resolve_fl_variable. */
8912 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
8914 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
8916 /* Check to see if a derived type is blocked from being host
8917 associated by the presence of another class I symbol in the same
8918 namespace. 14.6.1.3 of the standard and the discussion on
8919 comp.lang.fortran. */
8920 if (sym->ns != sym->ts.u.derived->ns
8921 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
8924 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
8925 if (s && s->attr.flavor != FL_DERIVED)
8927 gfc_error ("The type '%s' cannot be host associated at %L "
8928 "because it is blocked by an incompatible object "
8929 "of the same name declared at %L",
8930 sym->ts.u.derived->name, &sym->declared_at,
8936 /* 4th constraint in section 11.3: "If an object of a type for which
8937 component-initialization is specified (R429) appears in the
8938 specification-part of a module and does not have the ALLOCATABLE
8939 or POINTER attribute, the object shall have the SAVE attribute."
8941 The check for initializers is performed with
8942 has_default_initializer because gfc_default_initializer generates
8943 a hidden default for allocatable components. */
8944 if (!(sym->value || no_init_flag) && sym->ns->proc_name
8945 && sym->ns->proc_name->attr.flavor == FL_MODULE
8946 && !sym->ns->save_all && !sym->attr.save
8947 && !sym->attr.pointer && !sym->attr.allocatable
8948 && has_default_initializer (sym->ts.u.derived)
8949 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
8950 "module variable '%s' at %L, needed due to "
8951 "the default initialization", sym->name,
8952 &sym->declared_at) == FAILURE)
8955 if (sym->ts.type == BT_CLASS)
8958 if (!gfc_type_is_extensible (sym->ts.u.derived->components->ts.u.derived))
8960 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
8961 sym->ts.u.derived->components->ts.u.derived->name,
8962 sym->name, &sym->declared_at);
8967 /* Assume that use associated symbols were checked in the module ns. */
8968 if (!sym->attr.class_ok && !sym->attr.use_assoc)
8970 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
8971 "or pointer", sym->name, &sym->declared_at);
8976 /* Assign default initializer. */
8977 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
8978 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
8980 sym->value = gfc_default_initializer (&sym->ts);
8987 /* Resolve symbols with flavor variable. */
8990 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
8992 int no_init_flag, automatic_flag;
8994 const char *auto_save_msg;
8996 auto_save_msg = "Automatic object '%s' at %L cannot have the "
8999 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9002 /* Set this flag to check that variables are parameters of all entries.
9003 This check is effected by the call to gfc_resolve_expr through
9004 is_non_constant_shape_array. */
9005 specification_expr = 1;
9007 if (sym->ns->proc_name
9008 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9009 || sym->ns->proc_name->attr.is_main_program)
9010 && !sym->attr.use_assoc
9011 && !sym->attr.allocatable
9012 && !sym->attr.pointer
9013 && is_non_constant_shape_array (sym))
9015 /* The shape of a main program or module array needs to be
9017 gfc_error ("The module or main program array '%s' at %L must "
9018 "have constant shape", sym->name, &sym->declared_at);
9019 specification_expr = 0;
9023 if (sym->ts.type == BT_CHARACTER)
9025 /* Make sure that character string variables with assumed length are
9027 e = sym->ts.u.cl->length;
9028 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
9030 gfc_error ("Entity with assumed character length at %L must be a "
9031 "dummy argument or a PARAMETER", &sym->declared_at);
9035 if (e && sym->attr.save && !gfc_is_constant_expr (e))
9037 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9041 if (!gfc_is_constant_expr (e)
9042 && !(e->expr_type == EXPR_VARIABLE
9043 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
9044 && sym->ns->proc_name
9045 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9046 || sym->ns->proc_name->attr.is_main_program)
9047 && !sym->attr.use_assoc)
9049 gfc_error ("'%s' at %L must have constant character length "
9050 "in this context", sym->name, &sym->declared_at);
9055 if (sym->value == NULL && sym->attr.referenced)
9056 apply_default_init_local (sym); /* Try to apply a default initialization. */
9058 /* Determine if the symbol may not have an initializer. */
9059 no_init_flag = automatic_flag = 0;
9060 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
9061 || sym->attr.intrinsic || sym->attr.result)
9063 else if (sym->attr.dimension && !sym->attr.pointer
9064 && is_non_constant_shape_array (sym))
9066 no_init_flag = automatic_flag = 1;
9068 /* Also, they must not have the SAVE attribute.
9069 SAVE_IMPLICIT is checked below. */
9070 if (sym->attr.save == SAVE_EXPLICIT)
9072 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9077 /* Ensure that any initializer is simplified. */
9079 gfc_simplify_expr (sym->value, 1);
9081 /* Reject illegal initializers. */
9082 if (!sym->mark && sym->value)
9084 if (sym->attr.allocatable)
9085 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
9086 sym->name, &sym->declared_at);
9087 else if (sym->attr.external)
9088 gfc_error ("External '%s' at %L cannot have an initializer",
9089 sym->name, &sym->declared_at);
9090 else if (sym->attr.dummy
9091 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
9092 gfc_error ("Dummy '%s' at %L cannot have an initializer",
9093 sym->name, &sym->declared_at);
9094 else if (sym->attr.intrinsic)
9095 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
9096 sym->name, &sym->declared_at);
9097 else if (sym->attr.result)
9098 gfc_error ("Function result '%s' at %L cannot have an initializer",
9099 sym->name, &sym->declared_at);
9100 else if (automatic_flag)
9101 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
9102 sym->name, &sym->declared_at);
9109 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
9110 return resolve_fl_variable_derived (sym, no_init_flag);
9116 /* Resolve a procedure. */
9119 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
9121 gfc_formal_arglist *arg;
9123 if (sym->attr.function
9124 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9127 if (sym->ts.type == BT_CHARACTER)
9129 gfc_charlen *cl = sym->ts.u.cl;
9131 if (cl && cl->length && gfc_is_constant_expr (cl->length)
9132 && resolve_charlen (cl) == FAILURE)
9135 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9136 && sym->attr.proc == PROC_ST_FUNCTION)
9138 gfc_error ("Character-valued statement function '%s' at %L must "
9139 "have constant length", sym->name, &sym->declared_at);
9144 /* Ensure that derived type for are not of a private type. Internal
9145 module procedures are excluded by 2.2.3.3 - i.e., they are not
9146 externally accessible and can access all the objects accessible in
9148 if (!(sym->ns->parent
9149 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
9150 && gfc_check_access(sym->attr.access, sym->ns->default_access))
9152 gfc_interface *iface;
9154 for (arg = sym->formal; arg; arg = arg->next)
9157 && arg->sym->ts.type == BT_DERIVED
9158 && !arg->sym->ts.u.derived->attr.use_assoc
9159 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9160 arg->sym->ts.u.derived->ns->default_access)
9161 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
9162 "PRIVATE type and cannot be a dummy argument"
9163 " of '%s', which is PUBLIC at %L",
9164 arg->sym->name, sym->name, &sym->declared_at)
9167 /* Stop this message from recurring. */
9168 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9173 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9174 PRIVATE to the containing module. */
9175 for (iface = sym->generic; iface; iface = iface->next)
9177 for (arg = iface->sym->formal; arg; arg = arg->next)
9180 && arg->sym->ts.type == BT_DERIVED
9181 && !arg->sym->ts.u.derived->attr.use_assoc
9182 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9183 arg->sym->ts.u.derived->ns->default_access)
9184 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9185 "'%s' in PUBLIC interface '%s' at %L "
9186 "takes dummy arguments of '%s' which is "
9187 "PRIVATE", iface->sym->name, sym->name,
9188 &iface->sym->declared_at,
9189 gfc_typename (&arg->sym->ts)) == FAILURE)
9191 /* Stop this message from recurring. */
9192 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9198 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9199 PRIVATE to the containing module. */
9200 for (iface = sym->generic; iface; iface = iface->next)
9202 for (arg = iface->sym->formal; arg; arg = arg->next)
9205 && arg->sym->ts.type == BT_DERIVED
9206 && !arg->sym->ts.u.derived->attr.use_assoc
9207 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9208 arg->sym->ts.u.derived->ns->default_access)
9209 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9210 "'%s' in PUBLIC interface '%s' at %L "
9211 "takes dummy arguments of '%s' which is "
9212 "PRIVATE", iface->sym->name, sym->name,
9213 &iface->sym->declared_at,
9214 gfc_typename (&arg->sym->ts)) == FAILURE)
9216 /* Stop this message from recurring. */
9217 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9224 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9225 && !sym->attr.proc_pointer)
9227 gfc_error ("Function '%s' at %L cannot have an initializer",
9228 sym->name, &sym->declared_at);
9232 /* An external symbol may not have an initializer because it is taken to be
9233 a procedure. Exception: Procedure Pointers. */
9234 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9236 gfc_error ("External object '%s' at %L may not have an initializer",
9237 sym->name, &sym->declared_at);
9241 /* An elemental function is required to return a scalar 12.7.1 */
9242 if (sym->attr.elemental && sym->attr.function && sym->as)
9244 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9245 "result", sym->name, &sym->declared_at);
9246 /* Reset so that the error only occurs once. */
9247 sym->attr.elemental = 0;
9251 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9252 char-len-param shall not be array-valued, pointer-valued, recursive
9253 or pure. ....snip... A character value of * may only be used in the
9254 following ways: (i) Dummy arg of procedure - dummy associates with
9255 actual length; (ii) To declare a named constant; or (iii) External
9256 function - but length must be declared in calling scoping unit. */
9257 if (sym->attr.function
9258 && sym->ts.type == BT_CHARACTER
9259 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9261 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9262 || (sym->attr.recursive) || (sym->attr.pure))
9264 if (sym->as && sym->as->rank)
9265 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9266 "array-valued", sym->name, &sym->declared_at);
9268 if (sym->attr.pointer)
9269 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9270 "pointer-valued", sym->name, &sym->declared_at);
9273 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9274 "pure", sym->name, &sym->declared_at);
9276 if (sym->attr.recursive)
9277 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9278 "recursive", sym->name, &sym->declared_at);
9283 /* Appendix B.2 of the standard. Contained functions give an
9284 error anyway. Fixed-form is likely to be F77/legacy. */
9285 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9286 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9287 "CHARACTER(*) function '%s' at %L",
9288 sym->name, &sym->declared_at);
9291 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9293 gfc_formal_arglist *curr_arg;
9294 int has_non_interop_arg = 0;
9296 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9297 sym->common_block) == FAILURE)
9299 /* Clear these to prevent looking at them again if there was an
9301 sym->attr.is_bind_c = 0;
9302 sym->attr.is_c_interop = 0;
9303 sym->ts.is_c_interop = 0;
9307 /* So far, no errors have been found. */
9308 sym->attr.is_c_interop = 1;
9309 sym->ts.is_c_interop = 1;
9312 curr_arg = sym->formal;
9313 while (curr_arg != NULL)
9315 /* Skip implicitly typed dummy args here. */
9316 if (curr_arg->sym->attr.implicit_type == 0)
9317 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9318 /* If something is found to fail, record the fact so we
9319 can mark the symbol for the procedure as not being
9320 BIND(C) to try and prevent multiple errors being
9322 has_non_interop_arg = 1;
9324 curr_arg = curr_arg->next;
9327 /* See if any of the arguments were not interoperable and if so, clear
9328 the procedure symbol to prevent duplicate error messages. */
9329 if (has_non_interop_arg != 0)
9331 sym->attr.is_c_interop = 0;
9332 sym->ts.is_c_interop = 0;
9333 sym->attr.is_bind_c = 0;
9337 if (!sym->attr.proc_pointer)
9339 if (sym->attr.save == SAVE_EXPLICIT)
9341 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9342 "in '%s' at %L", sym->name, &sym->declared_at);
9345 if (sym->attr.intent)
9347 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9348 "in '%s' at %L", sym->name, &sym->declared_at);
9351 if (sym->attr.subroutine && sym->attr.result)
9353 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9354 "in '%s' at %L", sym->name, &sym->declared_at);
9357 if (sym->attr.external && sym->attr.function
9358 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9359 || sym->attr.contained))
9361 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9362 "in '%s' at %L", sym->name, &sym->declared_at);
9365 if (strcmp ("ppr@", sym->name) == 0)
9367 gfc_error ("Procedure pointer result '%s' at %L "
9368 "is missing the pointer attribute",
9369 sym->ns->proc_name->name, &sym->declared_at);
9378 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9379 been defined and we now know their defined arguments, check that they fulfill
9380 the requirements of the standard for procedures used as finalizers. */
9383 gfc_resolve_finalizers (gfc_symbol* derived)
9385 gfc_finalizer* list;
9386 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9387 gfc_try result = SUCCESS;
9388 bool seen_scalar = false;
9390 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9393 /* Walk over the list of finalizer-procedures, check them, and if any one
9394 does not fit in with the standard's definition, print an error and remove
9395 it from the list. */
9396 prev_link = &derived->f2k_derived->finalizers;
9397 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9403 /* Skip this finalizer if we already resolved it. */
9404 if (list->proc_tree)
9406 prev_link = &(list->next);
9410 /* Check this exists and is a SUBROUTINE. */
9411 if (!list->proc_sym->attr.subroutine)
9413 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9414 list->proc_sym->name, &list->where);
9418 /* We should have exactly one argument. */
9419 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9421 gfc_error ("FINAL procedure at %L must have exactly one argument",
9425 arg = list->proc_sym->formal->sym;
9427 /* This argument must be of our type. */
9428 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9430 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9431 &arg->declared_at, derived->name);
9435 /* It must neither be a pointer nor allocatable nor optional. */
9436 if (arg->attr.pointer)
9438 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9442 if (arg->attr.allocatable)
9444 gfc_error ("Argument of FINAL procedure at %L must not be"
9445 " ALLOCATABLE", &arg->declared_at);
9448 if (arg->attr.optional)
9450 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9455 /* It must not be INTENT(OUT). */
9456 if (arg->attr.intent == INTENT_OUT)
9458 gfc_error ("Argument of FINAL procedure at %L must not be"
9459 " INTENT(OUT)", &arg->declared_at);
9463 /* Warn if the procedure is non-scalar and not assumed shape. */
9464 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9465 && arg->as->type != AS_ASSUMED_SHAPE)
9466 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9467 " shape argument", &arg->declared_at);
9469 /* Check that it does not match in kind and rank with a FINAL procedure
9470 defined earlier. To really loop over the *earlier* declarations,
9471 we need to walk the tail of the list as new ones were pushed at the
9473 /* TODO: Handle kind parameters once they are implemented. */
9474 my_rank = (arg->as ? arg->as->rank : 0);
9475 for (i = list->next; i; i = i->next)
9477 /* Argument list might be empty; that is an error signalled earlier,
9478 but we nevertheless continued resolving. */
9479 if (i->proc_sym->formal)
9481 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9482 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9483 if (i_rank == my_rank)
9485 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9486 " rank (%d) as '%s'",
9487 list->proc_sym->name, &list->where, my_rank,
9494 /* Is this the/a scalar finalizer procedure? */
9495 if (!arg->as || arg->as->rank == 0)
9498 /* Find the symtree for this procedure. */
9499 gcc_assert (!list->proc_tree);
9500 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9502 prev_link = &list->next;
9505 /* Remove wrong nodes immediately from the list so we don't risk any
9506 troubles in the future when they might fail later expectations. */
9510 *prev_link = list->next;
9511 gfc_free_finalizer (i);
9514 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9515 were nodes in the list, must have been for arrays. It is surely a good
9516 idea to have a scalar version there if there's something to finalize. */
9517 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9518 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9519 " defined at %L, suggest also scalar one",
9520 derived->name, &derived->declared_at);
9522 /* TODO: Remove this error when finalization is finished. */
9523 gfc_error ("Finalization at %L is not yet implemented",
9524 &derived->declared_at);
9530 /* Check that it is ok for the typebound procedure proc to override the
9534 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9537 const gfc_symbol* proc_target;
9538 const gfc_symbol* old_target;
9539 unsigned proc_pass_arg, old_pass_arg, argpos;
9540 gfc_formal_arglist* proc_formal;
9541 gfc_formal_arglist* old_formal;
9543 /* This procedure should only be called for non-GENERIC proc. */
9544 gcc_assert (!proc->n.tb->is_generic);
9546 /* If the overwritten procedure is GENERIC, this is an error. */
9547 if (old->n.tb->is_generic)
9549 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9550 old->name, &proc->n.tb->where);
9554 where = proc->n.tb->where;
9555 proc_target = proc->n.tb->u.specific->n.sym;
9556 old_target = old->n.tb->u.specific->n.sym;
9558 /* Check that overridden binding is not NON_OVERRIDABLE. */
9559 if (old->n.tb->non_overridable)
9561 gfc_error ("'%s' at %L overrides a procedure binding declared"
9562 " NON_OVERRIDABLE", proc->name, &where);
9566 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9567 if (!old->n.tb->deferred && proc->n.tb->deferred)
9569 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9570 " non-DEFERRED binding", proc->name, &where);
9574 /* If the overridden binding is PURE, the overriding must be, too. */
9575 if (old_target->attr.pure && !proc_target->attr.pure)
9577 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9578 proc->name, &where);
9582 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9583 is not, the overriding must not be either. */
9584 if (old_target->attr.elemental && !proc_target->attr.elemental)
9586 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
9587 " ELEMENTAL", proc->name, &where);
9590 if (!old_target->attr.elemental && proc_target->attr.elemental)
9592 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
9593 " be ELEMENTAL, either", proc->name, &where);
9597 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
9599 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
9601 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
9602 " SUBROUTINE", proc->name, &where);
9606 /* If the overridden binding is a FUNCTION, the overriding must also be a
9607 FUNCTION and have the same characteristics. */
9608 if (old_target->attr.function)
9610 if (!proc_target->attr.function)
9612 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
9613 " FUNCTION", proc->name, &where);
9617 /* FIXME: Do more comprehensive checking (including, for instance, the
9618 rank and array-shape). */
9619 gcc_assert (proc_target->result && old_target->result);
9620 if (!gfc_compare_types (&proc_target->result->ts,
9621 &old_target->result->ts))
9623 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
9624 " matching result types", proc->name, &where);
9629 /* If the overridden binding is PUBLIC, the overriding one must not be
9631 if (old->n.tb->access == ACCESS_PUBLIC
9632 && proc->n.tb->access == ACCESS_PRIVATE)
9634 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
9635 " PRIVATE", proc->name, &where);
9639 /* Compare the formal argument lists of both procedures. This is also abused
9640 to find the position of the passed-object dummy arguments of both
9641 bindings as at least the overridden one might not yet be resolved and we
9642 need those positions in the check below. */
9643 proc_pass_arg = old_pass_arg = 0;
9644 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
9646 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
9649 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
9650 proc_formal && old_formal;
9651 proc_formal = proc_formal->next, old_formal = old_formal->next)
9653 if (proc->n.tb->pass_arg
9654 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
9655 proc_pass_arg = argpos;
9656 if (old->n.tb->pass_arg
9657 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
9658 old_pass_arg = argpos;
9660 /* Check that the names correspond. */
9661 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
9663 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
9664 " to match the corresponding argument of the overridden"
9665 " procedure", proc_formal->sym->name, proc->name, &where,
9666 old_formal->sym->name);
9670 /* Check that the types correspond if neither is the passed-object
9672 /* FIXME: Do more comprehensive testing here. */
9673 if (proc_pass_arg != argpos && old_pass_arg != argpos
9674 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
9676 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
9677 "in respect to the overridden procedure",
9678 proc_formal->sym->name, proc->name, &where);
9684 if (proc_formal || old_formal)
9686 gfc_error ("'%s' at %L must have the same number of formal arguments as"
9687 " the overridden procedure", proc->name, &where);
9691 /* If the overridden binding is NOPASS, the overriding one must also be
9693 if (old->n.tb->nopass && !proc->n.tb->nopass)
9695 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
9696 " NOPASS", proc->name, &where);
9700 /* If the overridden binding is PASS(x), the overriding one must also be
9701 PASS and the passed-object dummy arguments must correspond. */
9702 if (!old->n.tb->nopass)
9704 if (proc->n.tb->nopass)
9706 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
9707 " PASS", proc->name, &where);
9711 if (proc_pass_arg != old_pass_arg)
9713 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
9714 " the same position as the passed-object dummy argument of"
9715 " the overridden procedure", proc->name, &where);
9724 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
9727 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
9728 const char* generic_name, locus where)
9733 gcc_assert (t1->specific && t2->specific);
9734 gcc_assert (!t1->specific->is_generic);
9735 gcc_assert (!t2->specific->is_generic);
9737 sym1 = t1->specific->u.specific->n.sym;
9738 sym2 = t2->specific->u.specific->n.sym;
9743 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
9744 if (sym1->attr.subroutine != sym2->attr.subroutine
9745 || sym1->attr.function != sym2->attr.function)
9747 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
9748 " GENERIC '%s' at %L",
9749 sym1->name, sym2->name, generic_name, &where);
9753 /* Compare the interfaces. */
9754 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
9756 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
9757 sym1->name, sym2->name, generic_name, &where);
9765 /* Worker function for resolving a generic procedure binding; this is used to
9766 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
9768 The difference between those cases is finding possible inherited bindings
9769 that are overridden, as one has to look for them in tb_sym_root,
9770 tb_uop_root or tb_op, respectively. Thus the caller must already find
9771 the super-type and set p->overridden correctly. */
9774 resolve_tb_generic_targets (gfc_symbol* super_type,
9775 gfc_typebound_proc* p, const char* name)
9777 gfc_tbp_generic* target;
9778 gfc_symtree* first_target;
9779 gfc_symtree* inherited;
9781 gcc_assert (p && p->is_generic);
9783 /* Try to find the specific bindings for the symtrees in our target-list. */
9784 gcc_assert (p->u.generic);
9785 for (target = p->u.generic; target; target = target->next)
9786 if (!target->specific)
9788 gfc_typebound_proc* overridden_tbp;
9790 const char* target_name;
9792 target_name = target->specific_st->name;
9794 /* Defined for this type directly. */
9795 if (target->specific_st->n.tb)
9797 target->specific = target->specific_st->n.tb;
9798 goto specific_found;
9801 /* Look for an inherited specific binding. */
9804 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
9809 gcc_assert (inherited->n.tb);
9810 target->specific = inherited->n.tb;
9811 goto specific_found;
9815 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
9816 " at %L", target_name, name, &p->where);
9819 /* Once we've found the specific binding, check it is not ambiguous with
9820 other specifics already found or inherited for the same GENERIC. */
9822 gcc_assert (target->specific);
9824 /* This must really be a specific binding! */
9825 if (target->specific->is_generic)
9827 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
9828 " '%s' is GENERIC, too", name, &p->where, target_name);
9832 /* Check those already resolved on this type directly. */
9833 for (g = p->u.generic; g; g = g->next)
9834 if (g != target && g->specific
9835 && check_generic_tbp_ambiguity (target, g, name, p->where)
9839 /* Check for ambiguity with inherited specific targets. */
9840 for (overridden_tbp = p->overridden; overridden_tbp;
9841 overridden_tbp = overridden_tbp->overridden)
9842 if (overridden_tbp->is_generic)
9844 for (g = overridden_tbp->u.generic; g; g = g->next)
9846 gcc_assert (g->specific);
9847 if (check_generic_tbp_ambiguity (target, g,
9848 name, p->where) == FAILURE)
9854 /* If we attempt to "overwrite" a specific binding, this is an error. */
9855 if (p->overridden && !p->overridden->is_generic)
9857 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
9858 " the same name", name, &p->where);
9862 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
9863 all must have the same attributes here. */
9864 first_target = p->u.generic->specific->u.specific;
9865 gcc_assert (first_target);
9866 p->subroutine = first_target->n.sym->attr.subroutine;
9867 p->function = first_target->n.sym->attr.function;
9873 /* Resolve a GENERIC procedure binding for a derived type. */
9876 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
9878 gfc_symbol* super_type;
9880 /* Find the overridden binding if any. */
9881 st->n.tb->overridden = NULL;
9882 super_type = gfc_get_derived_super_type (derived);
9885 gfc_symtree* overridden;
9886 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
9889 if (overridden && overridden->n.tb)
9890 st->n.tb->overridden = overridden->n.tb;
9893 /* Resolve using worker function. */
9894 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
9898 /* Retrieve the target-procedure of an operator binding and do some checks in
9899 common for intrinsic and user-defined type-bound operators. */
9902 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
9904 gfc_symbol* target_proc;
9906 gcc_assert (target->specific && !target->specific->is_generic);
9907 target_proc = target->specific->u.specific->n.sym;
9908 gcc_assert (target_proc);
9910 /* All operator bindings must have a passed-object dummy argument. */
9911 if (target->specific->nopass)
9913 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
9921 /* Resolve a type-bound intrinsic operator. */
9924 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
9925 gfc_typebound_proc* p)
9927 gfc_symbol* super_type;
9928 gfc_tbp_generic* target;
9930 /* If there's already an error here, do nothing (but don't fail again). */
9934 /* Operators should always be GENERIC bindings. */
9935 gcc_assert (p->is_generic);
9937 /* Look for an overridden binding. */
9938 super_type = gfc_get_derived_super_type (derived);
9939 if (super_type && super_type->f2k_derived)
9940 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
9943 p->overridden = NULL;
9945 /* Resolve general GENERIC properties using worker function. */
9946 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
9949 /* Check the targets to be procedures of correct interface. */
9950 for (target = p->u.generic; target; target = target->next)
9952 gfc_symbol* target_proc;
9954 target_proc = get_checked_tb_operator_target (target, p->where);
9958 if (!gfc_check_operator_interface (target_proc, op, p->where))
9970 /* Resolve a type-bound user operator (tree-walker callback). */
9972 static gfc_symbol* resolve_bindings_derived;
9973 static gfc_try resolve_bindings_result;
9975 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
9978 resolve_typebound_user_op (gfc_symtree* stree)
9980 gfc_symbol* super_type;
9981 gfc_tbp_generic* target;
9983 gcc_assert (stree && stree->n.tb);
9985 if (stree->n.tb->error)
9988 /* Operators should always be GENERIC bindings. */
9989 gcc_assert (stree->n.tb->is_generic);
9991 /* Find overridden procedure, if any. */
9992 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9993 if (super_type && super_type->f2k_derived)
9995 gfc_symtree* overridden;
9996 overridden = gfc_find_typebound_user_op (super_type, NULL,
9997 stree->name, true, NULL);
9999 if (overridden && overridden->n.tb)
10000 stree->n.tb->overridden = overridden->n.tb;
10003 stree->n.tb->overridden = NULL;
10005 /* Resolve basically using worker function. */
10006 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10010 /* Check the targets to be functions of correct interface. */
10011 for (target = stree->n.tb->u.generic; target; target = target->next)
10013 gfc_symbol* target_proc;
10015 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10019 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10026 resolve_bindings_result = FAILURE;
10027 stree->n.tb->error = 1;
10031 /* Resolve the type-bound procedures for a derived type. */
10034 resolve_typebound_procedure (gfc_symtree* stree)
10038 gfc_symbol* me_arg;
10039 gfc_symbol* super_type;
10040 gfc_component* comp;
10042 gcc_assert (stree);
10044 /* Undefined specific symbol from GENERIC target definition. */
10048 if (stree->n.tb->error)
10051 /* If this is a GENERIC binding, use that routine. */
10052 if (stree->n.tb->is_generic)
10054 if (resolve_typebound_generic (resolve_bindings_derived, stree)
10060 /* Get the target-procedure to check it. */
10061 gcc_assert (!stree->n.tb->is_generic);
10062 gcc_assert (stree->n.tb->u.specific);
10063 proc = stree->n.tb->u.specific->n.sym;
10064 where = stree->n.tb->where;
10066 /* Default access should already be resolved from the parser. */
10067 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
10069 /* It should be a module procedure or an external procedure with explicit
10070 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
10071 if ((!proc->attr.subroutine && !proc->attr.function)
10072 || (proc->attr.proc != PROC_MODULE
10073 && proc->attr.if_source != IFSRC_IFBODY)
10074 || (proc->attr.abstract && !stree->n.tb->deferred))
10076 gfc_error ("'%s' must be a module procedure or an external procedure with"
10077 " an explicit interface at %L", proc->name, &where);
10080 stree->n.tb->subroutine = proc->attr.subroutine;
10081 stree->n.tb->function = proc->attr.function;
10083 /* Find the super-type of the current derived type. We could do this once and
10084 store in a global if speed is needed, but as long as not I believe this is
10085 more readable and clearer. */
10086 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10088 /* If PASS, resolve and check arguments if not already resolved / loaded
10089 from a .mod file. */
10090 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
10092 if (stree->n.tb->pass_arg)
10094 gfc_formal_arglist* i;
10096 /* If an explicit passing argument name is given, walk the arg-list
10097 and look for it. */
10100 stree->n.tb->pass_arg_num = 1;
10101 for (i = proc->formal; i; i = i->next)
10103 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
10108 ++stree->n.tb->pass_arg_num;
10113 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
10115 proc->name, stree->n.tb->pass_arg, &where,
10116 stree->n.tb->pass_arg);
10122 /* Otherwise, take the first one; there should in fact be at least
10124 stree->n.tb->pass_arg_num = 1;
10127 gfc_error ("Procedure '%s' with PASS at %L must have at"
10128 " least one argument", proc->name, &where);
10131 me_arg = proc->formal->sym;
10134 /* Now check that the argument-type matches and the passed-object
10135 dummy argument is generally fine. */
10137 gcc_assert (me_arg);
10139 if (me_arg->ts.type != BT_CLASS)
10141 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10142 " at %L", proc->name, &where);
10146 if (me_arg->ts.u.derived->components->ts.u.derived
10147 != resolve_bindings_derived)
10149 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10150 " the derived-type '%s'", me_arg->name, proc->name,
10151 me_arg->name, &where, resolve_bindings_derived->name);
10155 gcc_assert (me_arg->ts.type == BT_CLASS);
10156 if (me_arg->ts.u.derived->components->as
10157 && me_arg->ts.u.derived->components->as->rank > 0)
10159 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
10160 " scalar", proc->name, &where);
10163 if (me_arg->ts.u.derived->components->attr.allocatable)
10165 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10166 " be ALLOCATABLE", proc->name, &where);
10169 if (me_arg->ts.u.derived->components->attr.class_pointer)
10171 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10172 " be POINTER", proc->name, &where);
10177 /* If we are extending some type, check that we don't override a procedure
10178 flagged NON_OVERRIDABLE. */
10179 stree->n.tb->overridden = NULL;
10182 gfc_symtree* overridden;
10183 overridden = gfc_find_typebound_proc (super_type, NULL,
10184 stree->name, true, NULL);
10186 if (overridden && overridden->n.tb)
10187 stree->n.tb->overridden = overridden->n.tb;
10189 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
10193 /* See if there's a name collision with a component directly in this type. */
10194 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
10195 if (!strcmp (comp->name, stree->name))
10197 gfc_error ("Procedure '%s' at %L has the same name as a component of"
10199 stree->name, &where, resolve_bindings_derived->name);
10203 /* Try to find a name collision with an inherited component. */
10204 if (super_type && gfc_find_component (super_type, stree->name, true, true))
10206 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
10207 " component of '%s'",
10208 stree->name, &where, resolve_bindings_derived->name);
10212 stree->n.tb->error = 0;
10216 resolve_bindings_result = FAILURE;
10217 stree->n.tb->error = 1;
10221 resolve_typebound_procedures (gfc_symbol* derived)
10225 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10228 resolve_bindings_derived = derived;
10229 resolve_bindings_result = SUCCESS;
10231 if (derived->f2k_derived->tb_sym_root)
10232 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10233 &resolve_typebound_procedure);
10235 if (derived->f2k_derived->tb_uop_root)
10236 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10237 &resolve_typebound_user_op);
10239 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10241 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10242 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10244 resolve_bindings_result = FAILURE;
10247 return resolve_bindings_result;
10251 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10252 to give all identical derived types the same backend_decl. */
10254 add_dt_to_dt_list (gfc_symbol *derived)
10256 gfc_dt_list *dt_list;
10258 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10259 if (derived == dt_list->derived)
10262 if (dt_list == NULL)
10264 dt_list = gfc_get_dt_list ();
10265 dt_list->next = gfc_derived_types;
10266 dt_list->derived = derived;
10267 gfc_derived_types = dt_list;
10272 /* Ensure that a derived-type is really not abstract, meaning that every
10273 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10276 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10281 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10283 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10286 if (st->n.tb && st->n.tb->deferred)
10288 gfc_symtree* overriding;
10289 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10290 gcc_assert (overriding && overriding->n.tb);
10291 if (overriding->n.tb->deferred)
10293 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10294 " '%s' is DEFERRED and not overridden",
10295 sub->name, &sub->declared_at, st->name);
10304 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10306 /* The algorithm used here is to recursively travel up the ancestry of sub
10307 and for each ancestor-type, check all bindings. If any of them is
10308 DEFERRED, look it up starting from sub and see if the found (overriding)
10309 binding is not DEFERRED.
10310 This is not the most efficient way to do this, but it should be ok and is
10311 clearer than something sophisticated. */
10313 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
10315 /* Walk bindings of this ancestor. */
10316 if (ancestor->f2k_derived)
10319 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10324 /* Find next ancestor type and recurse on it. */
10325 ancestor = gfc_get_derived_super_type (ancestor);
10327 return ensure_not_abstract (sub, ancestor);
10333 static void resolve_symbol (gfc_symbol *sym);
10336 /* Resolve the components of a derived type. */
10339 resolve_fl_derived (gfc_symbol *sym)
10341 gfc_symbol* super_type;
10345 super_type = gfc_get_derived_super_type (sym);
10347 /* Ensure the extended type gets resolved before we do. */
10348 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10351 /* An ABSTRACT type must be extensible. */
10352 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10354 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10355 sym->name, &sym->declared_at);
10359 for (c = sym->components; c != NULL; c = c->next)
10361 if (c->attr.proc_pointer && c->ts.interface)
10363 if (c->ts.interface->attr.procedure)
10364 gfc_error ("Interface '%s', used by procedure pointer component "
10365 "'%s' at %L, is declared in a later PROCEDURE statement",
10366 c->ts.interface->name, c->name, &c->loc);
10368 /* Get the attributes from the interface (now resolved). */
10369 if (c->ts.interface->attr.if_source
10370 || c->ts.interface->attr.intrinsic)
10372 gfc_symbol *ifc = c->ts.interface;
10374 if (ifc->formal && !ifc->formal_ns)
10375 resolve_symbol (ifc);
10377 if (ifc->attr.intrinsic)
10378 resolve_intrinsic (ifc, &ifc->declared_at);
10382 c->ts = ifc->result->ts;
10383 c->attr.allocatable = ifc->result->attr.allocatable;
10384 c->attr.pointer = ifc->result->attr.pointer;
10385 c->attr.dimension = ifc->result->attr.dimension;
10386 c->as = gfc_copy_array_spec (ifc->result->as);
10391 c->attr.allocatable = ifc->attr.allocatable;
10392 c->attr.pointer = ifc->attr.pointer;
10393 c->attr.dimension = ifc->attr.dimension;
10394 c->as = gfc_copy_array_spec (ifc->as);
10396 c->ts.interface = ifc;
10397 c->attr.function = ifc->attr.function;
10398 c->attr.subroutine = ifc->attr.subroutine;
10399 gfc_copy_formal_args_ppc (c, ifc);
10401 c->attr.pure = ifc->attr.pure;
10402 c->attr.elemental = ifc->attr.elemental;
10403 c->attr.recursive = ifc->attr.recursive;
10404 c->attr.always_explicit = ifc->attr.always_explicit;
10405 c->attr.ext_attr |= ifc->attr.ext_attr;
10406 /* Replace symbols in array spec. */
10410 for (i = 0; i < c->as->rank; i++)
10412 gfc_expr_replace_comp (c->as->lower[i], c);
10413 gfc_expr_replace_comp (c->as->upper[i], c);
10416 /* Copy char length. */
10417 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10419 c->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10420 gfc_expr_replace_comp (c->ts.u.cl->length, c);
10423 else if (c->ts.interface->name[0] != '\0')
10425 gfc_error ("Interface '%s' of procedure pointer component "
10426 "'%s' at %L must be explicit", c->ts.interface->name,
10431 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10433 /* Since PPCs are not implicitly typed, a PPC without an explicit
10434 interface must be a subroutine. */
10435 gfc_add_subroutine (&c->attr, c->name, &c->loc);
10438 /* Procedure pointer components: Check PASS arg. */
10439 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0)
10441 gfc_symbol* me_arg;
10443 if (c->tb->pass_arg)
10445 gfc_formal_arglist* i;
10447 /* If an explicit passing argument name is given, walk the arg-list
10448 and look for it. */
10451 c->tb->pass_arg_num = 1;
10452 for (i = c->formal; i; i = i->next)
10454 if (!strcmp (i->sym->name, c->tb->pass_arg))
10459 c->tb->pass_arg_num++;
10464 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10465 "at %L has no argument '%s'", c->name,
10466 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10473 /* Otherwise, take the first one; there should in fact be at least
10475 c->tb->pass_arg_num = 1;
10478 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10479 "must have at least one argument",
10484 me_arg = c->formal->sym;
10487 /* Now check that the argument-type matches. */
10488 gcc_assert (me_arg);
10489 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10490 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10491 || (me_arg->ts.type == BT_CLASS
10492 && me_arg->ts.u.derived->components->ts.u.derived != sym))
10494 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10495 " the derived type '%s'", me_arg->name, c->name,
10496 me_arg->name, &c->loc, sym->name);
10501 /* Check for C453. */
10502 if (me_arg->attr.dimension)
10504 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10505 "must be scalar", me_arg->name, c->name, me_arg->name,
10511 if (me_arg->attr.pointer)
10513 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10514 "may not have the POINTER attribute", me_arg->name,
10515 c->name, me_arg->name, &c->loc);
10520 if (me_arg->attr.allocatable)
10522 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10523 "may not be ALLOCATABLE", me_arg->name, c->name,
10524 me_arg->name, &c->loc);
10529 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
10530 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10531 " at %L", c->name, &c->loc);
10535 /* Check type-spec if this is not the parent-type component. */
10536 if ((!sym->attr.extension || c != sym->components)
10537 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
10540 /* If this type is an extension, set the accessibility of the parent
10542 if (super_type && c == sym->components
10543 && strcmp (super_type->name, c->name) == 0)
10544 c->attr.access = super_type->attr.access;
10546 /* If this type is an extension, see if this component has the same name
10547 as an inherited type-bound procedure. */
10549 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
10551 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
10552 " inherited type-bound procedure",
10553 c->name, sym->name, &c->loc);
10557 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
10559 if (c->ts.u.cl->length == NULL
10560 || (resolve_charlen (c->ts.u.cl) == FAILURE)
10561 || !gfc_is_constant_expr (c->ts.u.cl->length))
10563 gfc_error ("Character length of component '%s' needs to "
10564 "be a constant specification expression at %L",
10566 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
10571 if (c->ts.type == BT_DERIVED
10572 && sym->component_access != ACCESS_PRIVATE
10573 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10574 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
10575 && !c->ts.u.derived->attr.use_assoc
10576 && !gfc_check_access (c->ts.u.derived->attr.access,
10577 c->ts.u.derived->ns->default_access)
10578 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
10579 "is a PRIVATE type and cannot be a component of "
10580 "'%s', which is PUBLIC at %L", c->name,
10581 sym->name, &sym->declared_at) == FAILURE)
10584 if (sym->attr.sequence)
10586 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
10588 gfc_error ("Component %s of SEQUENCE type declared at %L does "
10589 "not have the SEQUENCE attribute",
10590 c->ts.u.derived->name, &sym->declared_at);
10595 if (c->ts.type == BT_DERIVED && c->attr.pointer
10596 && c->ts.u.derived->components == NULL
10597 && !c->ts.u.derived->attr.zero_comp)
10599 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10600 "that has not been declared", c->name, sym->name,
10606 if (c->ts.type == BT_CLASS
10607 && !(c->ts.u.derived->components->attr.pointer
10608 || c->ts.u.derived->components->attr.allocatable))
10610 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
10611 "or pointer", c->name, &c->loc);
10615 /* Ensure that all the derived type components are put on the
10616 derived type list; even in formal namespaces, where derived type
10617 pointer components might not have been declared. */
10618 if (c->ts.type == BT_DERIVED
10620 && c->ts.u.derived->components
10622 && sym != c->ts.u.derived)
10623 add_dt_to_dt_list (c->ts.u.derived);
10625 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
10629 for (i = 0; i < c->as->rank; i++)
10631 if (c->as->lower[i] == NULL
10632 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
10633 || !gfc_is_constant_expr (c->as->lower[i])
10634 || c->as->upper[i] == NULL
10635 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
10636 || !gfc_is_constant_expr (c->as->upper[i]))
10638 gfc_error ("Component '%s' of '%s' at %L must have "
10639 "constant array bounds",
10640 c->name, sym->name, &c->loc);
10646 /* Resolve the type-bound procedures. */
10647 if (resolve_typebound_procedures (sym) == FAILURE)
10650 /* Resolve the finalizer procedures. */
10651 if (gfc_resolve_finalizers (sym) == FAILURE)
10654 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
10655 all DEFERRED bindings are overridden. */
10656 if (super_type && super_type->attr.abstract && !sym->attr.abstract
10657 && ensure_not_abstract (sym, super_type) == FAILURE)
10660 /* Add derived type to the derived type list. */
10661 add_dt_to_dt_list (sym);
10668 resolve_fl_namelist (gfc_symbol *sym)
10673 /* Reject PRIVATE objects in a PUBLIC namelist. */
10674 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
10676 for (nl = sym->namelist; nl; nl = nl->next)
10678 if (!nl->sym->attr.use_assoc
10679 && !is_sym_host_assoc (nl->sym, sym->ns)
10680 && !gfc_check_access(nl->sym->attr.access,
10681 nl->sym->ns->default_access))
10683 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
10684 "cannot be member of PUBLIC namelist '%s' at %L",
10685 nl->sym->name, sym->name, &sym->declared_at);
10689 /* Types with private components that came here by USE-association. */
10690 if (nl->sym->ts.type == BT_DERIVED
10691 && derived_inaccessible (nl->sym->ts.u.derived))
10693 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
10694 "components and cannot be member of namelist '%s' at %L",
10695 nl->sym->name, sym->name, &sym->declared_at);
10699 /* Types with private components that are defined in the same module. */
10700 if (nl->sym->ts.type == BT_DERIVED
10701 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
10702 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
10703 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
10704 nl->sym->ns->default_access))
10706 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
10707 "cannot be a member of PUBLIC namelist '%s' at %L",
10708 nl->sym->name, sym->name, &sym->declared_at);
10714 for (nl = sym->namelist; nl; nl = nl->next)
10716 /* Reject namelist arrays of assumed shape. */
10717 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
10718 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
10719 "must not have assumed shape in namelist "
10720 "'%s' at %L", nl->sym->name, sym->name,
10721 &sym->declared_at) == FAILURE)
10724 /* Reject namelist arrays that are not constant shape. */
10725 if (is_non_constant_shape_array (nl->sym))
10727 gfc_error ("NAMELIST array object '%s' must have constant "
10728 "shape in namelist '%s' at %L", nl->sym->name,
10729 sym->name, &sym->declared_at);
10733 /* Namelist objects cannot have allocatable or pointer components. */
10734 if (nl->sym->ts.type != BT_DERIVED)
10737 if (nl->sym->ts.u.derived->attr.alloc_comp)
10739 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10740 "have ALLOCATABLE components",
10741 nl->sym->name, sym->name, &sym->declared_at);
10745 if (nl->sym->ts.u.derived->attr.pointer_comp)
10747 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10748 "have POINTER components",
10749 nl->sym->name, sym->name, &sym->declared_at);
10755 /* 14.1.2 A module or internal procedure represent local entities
10756 of the same type as a namelist member and so are not allowed. */
10757 for (nl = sym->namelist; nl; nl = nl->next)
10759 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
10762 if (nl->sym->attr.function && nl->sym == nl->sym->result)
10763 if ((nl->sym == sym->ns->proc_name)
10765 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
10769 if (nl->sym && nl->sym->name)
10770 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
10771 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
10773 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
10774 "attribute in '%s' at %L", nlsym->name,
10775 &sym->declared_at);
10785 resolve_fl_parameter (gfc_symbol *sym)
10787 /* A parameter array's shape needs to be constant. */
10788 if (sym->as != NULL
10789 && (sym->as->type == AS_DEFERRED
10790 || is_non_constant_shape_array (sym)))
10792 gfc_error ("Parameter array '%s' at %L cannot be automatic "
10793 "or of deferred shape", sym->name, &sym->declared_at);
10797 /* Make sure a parameter that has been implicitly typed still
10798 matches the implicit type, since PARAMETER statements can precede
10799 IMPLICIT statements. */
10800 if (sym->attr.implicit_type
10801 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
10804 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
10805 "later IMPLICIT type", sym->name, &sym->declared_at);
10809 /* Make sure the types of derived parameters are consistent. This
10810 type checking is deferred until resolution because the type may
10811 refer to a derived type from the host. */
10812 if (sym->ts.type == BT_DERIVED
10813 && !gfc_compare_types (&sym->ts, &sym->value->ts))
10815 gfc_error ("Incompatible derived type in PARAMETER at %L",
10816 &sym->value->where);
10823 /* Do anything necessary to resolve a symbol. Right now, we just
10824 assume that an otherwise unknown symbol is a variable. This sort
10825 of thing commonly happens for symbols in module. */
10828 resolve_symbol (gfc_symbol *sym)
10830 int check_constant, mp_flag;
10831 gfc_symtree *symtree;
10832 gfc_symtree *this_symtree;
10836 if (sym->attr.flavor == FL_UNKNOWN)
10839 /* If we find that a flavorless symbol is an interface in one of the
10840 parent namespaces, find its symtree in this namespace, free the
10841 symbol and set the symtree to point to the interface symbol. */
10842 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
10844 symtree = gfc_find_symtree (ns->sym_root, sym->name);
10845 if (symtree && symtree->n.sym->generic)
10847 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
10851 gfc_free_symbol (sym);
10852 symtree->n.sym->refs++;
10853 this_symtree->n.sym = symtree->n.sym;
10858 /* Otherwise give it a flavor according to such attributes as
10860 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
10861 sym->attr.flavor = FL_VARIABLE;
10864 sym->attr.flavor = FL_PROCEDURE;
10865 if (sym->attr.dimension)
10866 sym->attr.function = 1;
10870 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
10871 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
10873 if (sym->attr.procedure && sym->ts.interface
10874 && sym->attr.if_source != IFSRC_DECL)
10876 if (sym->ts.interface == sym)
10878 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
10879 "interface", sym->name, &sym->declared_at);
10882 if (sym->ts.interface->attr.procedure)
10884 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
10885 " in a later PROCEDURE statement", sym->ts.interface->name,
10886 sym->name,&sym->declared_at);
10890 /* Get the attributes from the interface (now resolved). */
10891 if (sym->ts.interface->attr.if_source
10892 || sym->ts.interface->attr.intrinsic)
10894 gfc_symbol *ifc = sym->ts.interface;
10895 resolve_symbol (ifc);
10897 if (ifc->attr.intrinsic)
10898 resolve_intrinsic (ifc, &ifc->declared_at);
10901 sym->ts = ifc->result->ts;
10904 sym->ts.interface = ifc;
10905 sym->attr.function = ifc->attr.function;
10906 sym->attr.subroutine = ifc->attr.subroutine;
10907 gfc_copy_formal_args (sym, ifc);
10909 sym->attr.allocatable = ifc->attr.allocatable;
10910 sym->attr.pointer = ifc->attr.pointer;
10911 sym->attr.pure = ifc->attr.pure;
10912 sym->attr.elemental = ifc->attr.elemental;
10913 sym->attr.dimension = ifc->attr.dimension;
10914 sym->attr.recursive = ifc->attr.recursive;
10915 sym->attr.always_explicit = ifc->attr.always_explicit;
10916 sym->attr.ext_attr |= ifc->attr.ext_attr;
10917 /* Copy array spec. */
10918 sym->as = gfc_copy_array_spec (ifc->as);
10922 for (i = 0; i < sym->as->rank; i++)
10924 gfc_expr_replace_symbols (sym->as->lower[i], sym);
10925 gfc_expr_replace_symbols (sym->as->upper[i], sym);
10928 /* Copy char length. */
10929 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10931 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10932 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
10935 else if (sym->ts.interface->name[0] != '\0')
10937 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
10938 sym->ts.interface->name, sym->name, &sym->declared_at);
10943 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
10946 /* Symbols that are module procedures with results (functions) have
10947 the types and array specification copied for type checking in
10948 procedures that call them, as well as for saving to a module
10949 file. These symbols can't stand the scrutiny that their results
10951 mp_flag = (sym->result != NULL && sym->result != sym);
10954 /* Make sure that the intrinsic is consistent with its internal
10955 representation. This needs to be done before assigning a default
10956 type to avoid spurious warnings. */
10957 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
10958 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
10961 /* Assign default type to symbols that need one and don't have one. */
10962 if (sym->ts.type == BT_UNKNOWN)
10964 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
10965 gfc_set_default_type (sym, 1, NULL);
10967 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
10968 && !sym->attr.function && !sym->attr.subroutine
10969 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
10970 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
10972 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
10974 /* The specific case of an external procedure should emit an error
10975 in the case that there is no implicit type. */
10977 gfc_set_default_type (sym, sym->attr.external, NULL);
10980 /* Result may be in another namespace. */
10981 resolve_symbol (sym->result);
10983 if (!sym->result->attr.proc_pointer)
10985 sym->ts = sym->result->ts;
10986 sym->as = gfc_copy_array_spec (sym->result->as);
10987 sym->attr.dimension = sym->result->attr.dimension;
10988 sym->attr.pointer = sym->result->attr.pointer;
10989 sym->attr.allocatable = sym->result->attr.allocatable;
10995 /* Assumed size arrays and assumed shape arrays must be dummy
10998 if (sym->as != NULL
10999 && (sym->as->type == AS_ASSUMED_SIZE
11000 || sym->as->type == AS_ASSUMED_SHAPE)
11001 && sym->attr.dummy == 0)
11003 if (sym->as->type == AS_ASSUMED_SIZE)
11004 gfc_error ("Assumed size array at %L must be a dummy argument",
11005 &sym->declared_at);
11007 gfc_error ("Assumed shape array at %L must be a dummy argument",
11008 &sym->declared_at);
11012 /* Make sure symbols with known intent or optional are really dummy
11013 variable. Because of ENTRY statement, this has to be deferred
11014 until resolution time. */
11016 if (!sym->attr.dummy
11017 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
11019 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
11023 if (sym->attr.value && !sym->attr.dummy)
11025 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
11026 "it is not a dummy argument", sym->name, &sym->declared_at);
11030 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
11032 gfc_charlen *cl = sym->ts.u.cl;
11033 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
11035 gfc_error ("Character dummy variable '%s' at %L with VALUE "
11036 "attribute must have constant length",
11037 sym->name, &sym->declared_at);
11041 if (sym->ts.is_c_interop
11042 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
11044 gfc_error ("C interoperable character dummy variable '%s' at %L "
11045 "with VALUE attribute must have length one",
11046 sym->name, &sym->declared_at);
11051 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
11052 do this for something that was implicitly typed because that is handled
11053 in gfc_set_default_type. Handle dummy arguments and procedure
11054 definitions separately. Also, anything that is use associated is not
11055 handled here but instead is handled in the module it is declared in.
11056 Finally, derived type definitions are allowed to be BIND(C) since that
11057 only implies that they're interoperable, and they are checked fully for
11058 interoperability when a variable is declared of that type. */
11059 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
11060 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
11061 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
11063 gfc_try t = SUCCESS;
11065 /* First, make sure the variable is declared at the
11066 module-level scope (J3/04-007, Section 15.3). */
11067 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
11068 sym->attr.in_common == 0)
11070 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
11071 "is neither a COMMON block nor declared at the "
11072 "module level scope", sym->name, &(sym->declared_at));
11075 else if (sym->common_head != NULL)
11077 t = verify_com_block_vars_c_interop (sym->common_head);
11081 /* If type() declaration, we need to verify that the components
11082 of the given type are all C interoperable, etc. */
11083 if (sym->ts.type == BT_DERIVED &&
11084 sym->ts.u.derived->attr.is_c_interop != 1)
11086 /* Make sure the user marked the derived type as BIND(C). If
11087 not, call the verify routine. This could print an error
11088 for the derived type more than once if multiple variables
11089 of that type are declared. */
11090 if (sym->ts.u.derived->attr.is_bind_c != 1)
11091 verify_bind_c_derived_type (sym->ts.u.derived);
11095 /* Verify the variable itself as C interoperable if it
11096 is BIND(C). It is not possible for this to succeed if
11097 the verify_bind_c_derived_type failed, so don't have to handle
11098 any error returned by verify_bind_c_derived_type. */
11099 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
11100 sym->common_block);
11105 /* clear the is_bind_c flag to prevent reporting errors more than
11106 once if something failed. */
11107 sym->attr.is_bind_c = 0;
11112 /* If a derived type symbol has reached this point, without its
11113 type being declared, we have an error. Notice that most
11114 conditions that produce undefined derived types have already
11115 been dealt with. However, the likes of:
11116 implicit type(t) (t) ..... call foo (t) will get us here if
11117 the type is not declared in the scope of the implicit
11118 statement. Change the type to BT_UNKNOWN, both because it is so
11119 and to prevent an ICE. */
11120 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
11121 && !sym->ts.u.derived->attr.zero_comp)
11123 gfc_error ("The derived type '%s' at %L is of type '%s', "
11124 "which has not been defined", sym->name,
11125 &sym->declared_at, sym->ts.u.derived->name);
11126 sym->ts.type = BT_UNKNOWN;
11130 /* Make sure that the derived type has been resolved and that the
11131 derived type is visible in the symbol's namespace, if it is a
11132 module function and is not PRIVATE. */
11133 if (sym->ts.type == BT_DERIVED
11134 && sym->ts.u.derived->attr.use_assoc
11135 && sym->ns->proc_name
11136 && sym->ns->proc_name->attr.flavor == FL_MODULE)
11140 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
11143 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
11144 if (!ds && sym->attr.function
11145 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11147 symtree = gfc_new_symtree (&sym->ns->sym_root,
11148 sym->ts.u.derived->name);
11149 symtree->n.sym = sym->ts.u.derived;
11150 sym->ts.u.derived->refs++;
11154 /* Unless the derived-type declaration is use associated, Fortran 95
11155 does not allow public entries of private derived types.
11156 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
11157 161 in 95-006r3. */
11158 if (sym->ts.type == BT_DERIVED
11159 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
11160 && !sym->ts.u.derived->attr.use_assoc
11161 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11162 && !gfc_check_access (sym->ts.u.derived->attr.access,
11163 sym->ts.u.derived->ns->default_access)
11164 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
11165 "of PRIVATE derived type '%s'",
11166 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
11167 : "variable", sym->name, &sym->declared_at,
11168 sym->ts.u.derived->name) == FAILURE)
11171 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
11172 default initialization is defined (5.1.2.4.4). */
11173 if (sym->ts.type == BT_DERIVED
11175 && sym->attr.intent == INTENT_OUT
11177 && sym->as->type == AS_ASSUMED_SIZE)
11179 for (c = sym->ts.u.derived->components; c; c = c->next)
11181 if (c->initializer)
11183 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
11184 "ASSUMED SIZE and so cannot have a default initializer",
11185 sym->name, &sym->declared_at);
11191 switch (sym->attr.flavor)
11194 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
11199 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
11204 if (resolve_fl_namelist (sym) == FAILURE)
11209 if (resolve_fl_parameter (sym) == FAILURE)
11217 /* Resolve array specifier. Check as well some constraints
11218 on COMMON blocks. */
11220 check_constant = sym->attr.in_common && !sym->attr.pointer;
11222 /* Set the formal_arg_flag so that check_conflict will not throw
11223 an error for host associated variables in the specification
11224 expression for an array_valued function. */
11225 if (sym->attr.function && sym->as)
11226 formal_arg_flag = 1;
11228 gfc_resolve_array_spec (sym->as, check_constant);
11230 formal_arg_flag = 0;
11232 /* Resolve formal namespaces. */
11233 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11234 && !sym->attr.contained && !sym->attr.intrinsic)
11235 gfc_resolve (sym->formal_ns);
11237 /* Make sure the formal namespace is present. */
11238 if (sym->formal && !sym->formal_ns)
11240 gfc_formal_arglist *formal = sym->formal;
11241 while (formal && !formal->sym)
11242 formal = formal->next;
11246 sym->formal_ns = formal->sym->ns;
11247 sym->formal_ns->refs++;
11251 /* Check threadprivate restrictions. */
11252 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11253 && (!sym->attr.in_common
11254 && sym->module == NULL
11255 && (sym->ns->proc_name == NULL
11256 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11257 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11259 /* If we have come this far we can apply default-initializers, as
11260 described in 14.7.5, to those variables that have not already
11261 been assigned one. */
11262 if (sym->ts.type == BT_DERIVED
11263 && sym->attr.referenced
11264 && sym->ns == gfc_current_ns
11266 && !sym->attr.allocatable
11267 && !sym->attr.alloc_comp)
11269 symbol_attribute *a = &sym->attr;
11271 if ((!a->save && !a->dummy && !a->pointer
11272 && !a->in_common && !a->use_assoc
11273 && !(a->function && sym != sym->result))
11274 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11275 apply_default_init (sym);
11278 /* If this symbol has a type-spec, check it. */
11279 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11280 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11281 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11287 /************* Resolve DATA statements *************/
11291 gfc_data_value *vnode;
11297 /* Advance the values structure to point to the next value in the data list. */
11300 next_data_value (void)
11302 while (mpz_cmp_ui (values.left, 0) == 0)
11305 if (values.vnode->next == NULL)
11308 values.vnode = values.vnode->next;
11309 mpz_set (values.left, values.vnode->repeat);
11317 check_data_variable (gfc_data_variable *var, locus *where)
11323 ar_type mark = AR_UNKNOWN;
11325 mpz_t section_index[GFC_MAX_DIMENSIONS];
11331 if (gfc_resolve_expr (var->expr) == FAILURE)
11335 mpz_init_set_si (offset, 0);
11338 if (e->expr_type != EXPR_VARIABLE)
11339 gfc_internal_error ("check_data_variable(): Bad expression");
11341 sym = e->symtree->n.sym;
11343 if (sym->ns->is_block_data && !sym->attr.in_common)
11345 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11346 sym->name, &sym->declared_at);
11349 if (e->ref == NULL && sym->as)
11351 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11352 " declaration", sym->name, where);
11356 has_pointer = sym->attr.pointer;
11358 for (ref = e->ref; ref; ref = ref->next)
11360 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11364 && ref->type == REF_ARRAY
11365 && ref->u.ar.type != AR_FULL)
11367 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11368 "be a full array", sym->name, where);
11373 if (e->rank == 0 || has_pointer)
11375 mpz_init_set_ui (size, 1);
11382 /* Find the array section reference. */
11383 for (ref = e->ref; ref; ref = ref->next)
11385 if (ref->type != REF_ARRAY)
11387 if (ref->u.ar.type == AR_ELEMENT)
11393 /* Set marks according to the reference pattern. */
11394 switch (ref->u.ar.type)
11402 /* Get the start position of array section. */
11403 gfc_get_section_index (ar, section_index, &offset);
11408 gcc_unreachable ();
11411 if (gfc_array_size (e, &size) == FAILURE)
11413 gfc_error ("Nonconstant array section at %L in DATA statement",
11415 mpz_clear (offset);
11422 while (mpz_cmp_ui (size, 0) > 0)
11424 if (next_data_value () == FAILURE)
11426 gfc_error ("DATA statement at %L has more variables than values",
11432 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
11436 /* If we have more than one element left in the repeat count,
11437 and we have more than one element left in the target variable,
11438 then create a range assignment. */
11439 /* FIXME: Only done for full arrays for now, since array sections
11441 if (mark == AR_FULL && ref && ref->next == NULL
11442 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
11446 if (mpz_cmp (size, values.left) >= 0)
11448 mpz_init_set (range, values.left);
11449 mpz_sub (size, size, values.left);
11450 mpz_set_ui (values.left, 0);
11454 mpz_init_set (range, size);
11455 mpz_sub (values.left, values.left, size);
11456 mpz_set_ui (size, 0);
11459 gfc_assign_data_value_range (var->expr, values.vnode->expr,
11462 mpz_add (offset, offset, range);
11466 /* Assign initial value to symbol. */
11469 mpz_sub_ui (values.left, values.left, 1);
11470 mpz_sub_ui (size, size, 1);
11472 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
11476 if (mark == AR_FULL)
11477 mpz_add_ui (offset, offset, 1);
11479 /* Modify the array section indexes and recalculate the offset
11480 for next element. */
11481 else if (mark == AR_SECTION)
11482 gfc_advance_section (section_index, ar, &offset);
11486 if (mark == AR_SECTION)
11488 for (i = 0; i < ar->dimen; i++)
11489 mpz_clear (section_index[i]);
11493 mpz_clear (offset);
11499 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
11501 /* Iterate over a list of elements in a DATA statement. */
11504 traverse_data_list (gfc_data_variable *var, locus *where)
11507 iterator_stack frame;
11508 gfc_expr *e, *start, *end, *step;
11509 gfc_try retval = SUCCESS;
11511 mpz_init (frame.value);
11513 start = gfc_copy_expr (var->iter.start);
11514 end = gfc_copy_expr (var->iter.end);
11515 step = gfc_copy_expr (var->iter.step);
11517 if (gfc_simplify_expr (start, 1) == FAILURE
11518 || start->expr_type != EXPR_CONSTANT)
11520 gfc_error ("iterator start at %L does not simplify", &start->where);
11524 if (gfc_simplify_expr (end, 1) == FAILURE
11525 || end->expr_type != EXPR_CONSTANT)
11527 gfc_error ("iterator end at %L does not simplify", &end->where);
11531 if (gfc_simplify_expr (step, 1) == FAILURE
11532 || step->expr_type != EXPR_CONSTANT)
11534 gfc_error ("iterator step at %L does not simplify", &step->where);
11539 mpz_init_set (trip, end->value.integer);
11540 mpz_sub (trip, trip, start->value.integer);
11541 mpz_add (trip, trip, step->value.integer);
11543 mpz_div (trip, trip, step->value.integer);
11545 mpz_set (frame.value, start->value.integer);
11547 frame.prev = iter_stack;
11548 frame.variable = var->iter.var->symtree;
11549 iter_stack = &frame;
11551 while (mpz_cmp_ui (trip, 0) > 0)
11553 if (traverse_data_var (var->list, where) == FAILURE)
11560 e = gfc_copy_expr (var->expr);
11561 if (gfc_simplify_expr (e, 1) == FAILURE)
11569 mpz_add (frame.value, frame.value, step->value.integer);
11571 mpz_sub_ui (trip, trip, 1);
11576 mpz_clear (frame.value);
11578 gfc_free_expr (start);
11579 gfc_free_expr (end);
11580 gfc_free_expr (step);
11582 iter_stack = frame.prev;
11587 /* Type resolve variables in the variable list of a DATA statement. */
11590 traverse_data_var (gfc_data_variable *var, locus *where)
11594 for (; var; var = var->next)
11596 if (var->expr == NULL)
11597 t = traverse_data_list (var, where);
11599 t = check_data_variable (var, where);
11609 /* Resolve the expressions and iterators associated with a data statement.
11610 This is separate from the assignment checking because data lists should
11611 only be resolved once. */
11614 resolve_data_variables (gfc_data_variable *d)
11616 for (; d; d = d->next)
11618 if (d->list == NULL)
11620 if (gfc_resolve_expr (d->expr) == FAILURE)
11625 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
11628 if (resolve_data_variables (d->list) == FAILURE)
11637 /* Resolve a single DATA statement. We implement this by storing a pointer to
11638 the value list into static variables, and then recursively traversing the
11639 variables list, expanding iterators and such. */
11642 resolve_data (gfc_data *d)
11645 if (resolve_data_variables (d->var) == FAILURE)
11648 values.vnode = d->value;
11649 if (d->value == NULL)
11650 mpz_set_ui (values.left, 0);
11652 mpz_set (values.left, d->value->repeat);
11654 if (traverse_data_var (d->var, &d->where) == FAILURE)
11657 /* At this point, we better not have any values left. */
11659 if (next_data_value () == SUCCESS)
11660 gfc_error ("DATA statement at %L has more values than variables",
11665 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
11666 accessed by host or use association, is a dummy argument to a pure function,
11667 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
11668 is storage associated with any such variable, shall not be used in the
11669 following contexts: (clients of this function). */
11671 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
11672 procedure. Returns zero if assignment is OK, nonzero if there is a
11675 gfc_impure_variable (gfc_symbol *sym)
11680 if (sym->attr.use_assoc || sym->attr.in_common)
11683 /* Check if the symbol's ns is inside the pure procedure. */
11684 for (ns = gfc_current_ns; ns; ns = ns->parent)
11688 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
11692 proc = sym->ns->proc_name;
11693 if (sym->attr.dummy && gfc_pure (proc)
11694 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
11696 proc->attr.function))
11699 /* TODO: Sort out what can be storage associated, if anything, and include
11700 it here. In principle equivalences should be scanned but it does not
11701 seem to be possible to storage associate an impure variable this way. */
11706 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
11707 current namespace is inside a pure procedure. */
11710 gfc_pure (gfc_symbol *sym)
11712 symbol_attribute attr;
11717 /* Check if the current namespace or one of its parents
11718 belongs to a pure procedure. */
11719 for (ns = gfc_current_ns; ns; ns = ns->parent)
11721 sym = ns->proc_name;
11725 if (attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental))
11733 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
11737 /* Test whether the current procedure is elemental or not. */
11740 gfc_elemental (gfc_symbol *sym)
11742 symbol_attribute attr;
11745 sym = gfc_current_ns->proc_name;
11750 return attr.flavor == FL_PROCEDURE && attr.elemental;
11754 /* Warn about unused labels. */
11757 warn_unused_fortran_label (gfc_st_label *label)
11762 warn_unused_fortran_label (label->left);
11764 if (label->defined == ST_LABEL_UNKNOWN)
11767 switch (label->referenced)
11769 case ST_LABEL_UNKNOWN:
11770 gfc_warning ("Label %d at %L defined but not used", label->value,
11774 case ST_LABEL_BAD_TARGET:
11775 gfc_warning ("Label %d at %L defined but cannot be used",
11776 label->value, &label->where);
11783 warn_unused_fortran_label (label->right);
11787 /* Returns the sequence type of a symbol or sequence. */
11790 sequence_type (gfc_typespec ts)
11799 if (ts.u.derived->components == NULL)
11800 return SEQ_NONDEFAULT;
11802 result = sequence_type (ts.u.derived->components->ts);
11803 for (c = ts.u.derived->components->next; c; c = c->next)
11804 if (sequence_type (c->ts) != result)
11810 if (ts.kind != gfc_default_character_kind)
11811 return SEQ_NONDEFAULT;
11813 return SEQ_CHARACTER;
11816 if (ts.kind != gfc_default_integer_kind)
11817 return SEQ_NONDEFAULT;
11819 return SEQ_NUMERIC;
11822 if (!(ts.kind == gfc_default_real_kind
11823 || ts.kind == gfc_default_double_kind))
11824 return SEQ_NONDEFAULT;
11826 return SEQ_NUMERIC;
11829 if (ts.kind != gfc_default_complex_kind)
11830 return SEQ_NONDEFAULT;
11832 return SEQ_NUMERIC;
11835 if (ts.kind != gfc_default_logical_kind)
11836 return SEQ_NONDEFAULT;
11838 return SEQ_NUMERIC;
11841 return SEQ_NONDEFAULT;
11846 /* Resolve derived type EQUIVALENCE object. */
11849 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
11851 gfc_component *c = derived->components;
11856 /* Shall not be an object of nonsequence derived type. */
11857 if (!derived->attr.sequence)
11859 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
11860 "attribute to be an EQUIVALENCE object", sym->name,
11865 /* Shall not have allocatable components. */
11866 if (derived->attr.alloc_comp)
11868 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
11869 "components to be an EQUIVALENCE object",sym->name,
11874 if (sym->attr.in_common && has_default_initializer (sym->ts.u.derived))
11876 gfc_error ("Derived type variable '%s' at %L with default "
11877 "initialization cannot be in EQUIVALENCE with a variable "
11878 "in COMMON", sym->name, &e->where);
11882 for (; c ; c = c->next)
11884 if (c->ts.type == BT_DERIVED
11885 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
11888 /* Shall not be an object of sequence derived type containing a pointer
11889 in the structure. */
11890 if (c->attr.pointer)
11892 gfc_error ("Derived type variable '%s' at %L with pointer "
11893 "component(s) cannot be an EQUIVALENCE object",
11894 sym->name, &e->where);
11902 /* Resolve equivalence object.
11903 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
11904 an allocatable array, an object of nonsequence derived type, an object of
11905 sequence derived type containing a pointer at any level of component
11906 selection, an automatic object, a function name, an entry name, a result
11907 name, a named constant, a structure component, or a subobject of any of
11908 the preceding objects. A substring shall not have length zero. A
11909 derived type shall not have components with default initialization nor
11910 shall two objects of an equivalence group be initialized.
11911 Either all or none of the objects shall have an protected attribute.
11912 The simple constraints are done in symbol.c(check_conflict) and the rest
11913 are implemented here. */
11916 resolve_equivalence (gfc_equiv *eq)
11919 gfc_symbol *first_sym;
11922 locus *last_where = NULL;
11923 seq_type eq_type, last_eq_type;
11924 gfc_typespec *last_ts;
11925 int object, cnt_protected;
11928 last_ts = &eq->expr->symtree->n.sym->ts;
11930 first_sym = eq->expr->symtree->n.sym;
11934 for (object = 1; eq; eq = eq->eq, object++)
11938 e->ts = e->symtree->n.sym->ts;
11939 /* match_varspec might not know yet if it is seeing
11940 array reference or substring reference, as it doesn't
11942 if (e->ref && e->ref->type == REF_ARRAY)
11944 gfc_ref *ref = e->ref;
11945 sym = e->symtree->n.sym;
11947 if (sym->attr.dimension)
11949 ref->u.ar.as = sym->as;
11953 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
11954 if (e->ts.type == BT_CHARACTER
11956 && ref->type == REF_ARRAY
11957 && ref->u.ar.dimen == 1
11958 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
11959 && ref->u.ar.stride[0] == NULL)
11961 gfc_expr *start = ref->u.ar.start[0];
11962 gfc_expr *end = ref->u.ar.end[0];
11965 /* Optimize away the (:) reference. */
11966 if (start == NULL && end == NULL)
11969 e->ref = ref->next;
11971 e->ref->next = ref->next;
11976 ref->type = REF_SUBSTRING;
11978 start = gfc_int_expr (1);
11979 ref->u.ss.start = start;
11980 if (end == NULL && e->ts.u.cl)
11981 end = gfc_copy_expr (e->ts.u.cl->length);
11982 ref->u.ss.end = end;
11983 ref->u.ss.length = e->ts.u.cl;
11990 /* Any further ref is an error. */
11993 gcc_assert (ref->type == REF_ARRAY);
11994 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
12000 if (gfc_resolve_expr (e) == FAILURE)
12003 sym = e->symtree->n.sym;
12005 if (sym->attr.is_protected)
12007 if (cnt_protected > 0 && cnt_protected != object)
12009 gfc_error ("Either all or none of the objects in the "
12010 "EQUIVALENCE set at %L shall have the "
12011 "PROTECTED attribute",
12016 /* Shall not equivalence common block variables in a PURE procedure. */
12017 if (sym->ns->proc_name
12018 && sym->ns->proc_name->attr.pure
12019 && sym->attr.in_common)
12021 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
12022 "object in the pure procedure '%s'",
12023 sym->name, &e->where, sym->ns->proc_name->name);
12027 /* Shall not be a named constant. */
12028 if (e->expr_type == EXPR_CONSTANT)
12030 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
12031 "object", sym->name, &e->where);
12035 if (e->ts.type == BT_DERIVED
12036 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
12039 /* Check that the types correspond correctly:
12041 A numeric sequence structure may be equivalenced to another sequence
12042 structure, an object of default integer type, default real type, double
12043 precision real type, default logical type such that components of the
12044 structure ultimately only become associated to objects of the same
12045 kind. A character sequence structure may be equivalenced to an object
12046 of default character kind or another character sequence structure.
12047 Other objects may be equivalenced only to objects of the same type and
12048 kind parameters. */
12050 /* Identical types are unconditionally OK. */
12051 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
12052 goto identical_types;
12054 last_eq_type = sequence_type (*last_ts);
12055 eq_type = sequence_type (sym->ts);
12057 /* Since the pair of objects is not of the same type, mixed or
12058 non-default sequences can be rejected. */
12060 msg = "Sequence %s with mixed components in EQUIVALENCE "
12061 "statement at %L with different type objects";
12063 && last_eq_type == SEQ_MIXED
12064 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
12066 || (eq_type == SEQ_MIXED
12067 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12068 &e->where) == FAILURE))
12071 msg = "Non-default type object or sequence %s in EQUIVALENCE "
12072 "statement at %L with objects of different type";
12074 && last_eq_type == SEQ_NONDEFAULT
12075 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
12076 last_where) == FAILURE)
12077 || (eq_type == SEQ_NONDEFAULT
12078 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12079 &e->where) == FAILURE))
12082 msg ="Non-CHARACTER object '%s' in default CHARACTER "
12083 "EQUIVALENCE statement at %L";
12084 if (last_eq_type == SEQ_CHARACTER
12085 && eq_type != SEQ_CHARACTER
12086 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12087 &e->where) == FAILURE)
12090 msg ="Non-NUMERIC object '%s' in default NUMERIC "
12091 "EQUIVALENCE statement at %L";
12092 if (last_eq_type == SEQ_NUMERIC
12093 && eq_type != SEQ_NUMERIC
12094 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12095 &e->where) == FAILURE)
12100 last_where = &e->where;
12105 /* Shall not be an automatic array. */
12106 if (e->ref->type == REF_ARRAY
12107 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
12109 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
12110 "an EQUIVALENCE object", sym->name, &e->where);
12117 /* Shall not be a structure component. */
12118 if (r->type == REF_COMPONENT)
12120 gfc_error ("Structure component '%s' at %L cannot be an "
12121 "EQUIVALENCE object",
12122 r->u.c.component->name, &e->where);
12126 /* A substring shall not have length zero. */
12127 if (r->type == REF_SUBSTRING)
12129 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
12131 gfc_error ("Substring at %L has length zero",
12132 &r->u.ss.start->where);
12142 /* Resolve function and ENTRY types, issue diagnostics if needed. */
12145 resolve_fntype (gfc_namespace *ns)
12147 gfc_entry_list *el;
12150 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
12153 /* If there are any entries, ns->proc_name is the entry master
12154 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
12156 sym = ns->entries->sym;
12158 sym = ns->proc_name;
12159 if (sym->result == sym
12160 && sym->ts.type == BT_UNKNOWN
12161 && gfc_set_default_type (sym, 0, NULL) == FAILURE
12162 && !sym->attr.untyped)
12164 gfc_error ("Function '%s' at %L has no IMPLICIT type",
12165 sym->name, &sym->declared_at);
12166 sym->attr.untyped = 1;
12169 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
12170 && !sym->attr.contained
12171 && !gfc_check_access (sym->ts.u.derived->attr.access,
12172 sym->ts.u.derived->ns->default_access)
12173 && gfc_check_access (sym->attr.access, sym->ns->default_access))
12175 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
12176 "%L of PRIVATE type '%s'", sym->name,
12177 &sym->declared_at, sym->ts.u.derived->name);
12181 for (el = ns->entries->next; el; el = el->next)
12183 if (el->sym->result == el->sym
12184 && el->sym->ts.type == BT_UNKNOWN
12185 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
12186 && !el->sym->attr.untyped)
12188 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
12189 el->sym->name, &el->sym->declared_at);
12190 el->sym->attr.untyped = 1;
12196 /* 12.3.2.1.1 Defined operators. */
12199 check_uop_procedure (gfc_symbol *sym, locus where)
12201 gfc_formal_arglist *formal;
12203 if (!sym->attr.function)
12205 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
12206 sym->name, &where);
12210 if (sym->ts.type == BT_CHARACTER
12211 && !(sym->ts.u.cl && sym->ts.u.cl->length)
12212 && !(sym->result && sym->result->ts.u.cl
12213 && sym->result->ts.u.cl->length))
12215 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
12216 "character length", sym->name, &where);
12220 formal = sym->formal;
12221 if (!formal || !formal->sym)
12223 gfc_error ("User operator procedure '%s' at %L must have at least "
12224 "one argument", sym->name, &where);
12228 if (formal->sym->attr.intent != INTENT_IN)
12230 gfc_error ("First argument of operator interface at %L must be "
12231 "INTENT(IN)", &where);
12235 if (formal->sym->attr.optional)
12237 gfc_error ("First argument of operator interface at %L cannot be "
12238 "optional", &where);
12242 formal = formal->next;
12243 if (!formal || !formal->sym)
12246 if (formal->sym->attr.intent != INTENT_IN)
12248 gfc_error ("Second argument of operator interface at %L must be "
12249 "INTENT(IN)", &where);
12253 if (formal->sym->attr.optional)
12255 gfc_error ("Second argument of operator interface at %L cannot be "
12256 "optional", &where);
12262 gfc_error ("Operator interface at %L must have, at most, two "
12263 "arguments", &where);
12271 gfc_resolve_uops (gfc_symtree *symtree)
12273 gfc_interface *itr;
12275 if (symtree == NULL)
12278 gfc_resolve_uops (symtree->left);
12279 gfc_resolve_uops (symtree->right);
12281 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12282 check_uop_procedure (itr->sym, itr->sym->declared_at);
12286 /* Examine all of the expressions associated with a program unit,
12287 assign types to all intermediate expressions, make sure that all
12288 assignments are to compatible types and figure out which names
12289 refer to which functions or subroutines. It doesn't check code
12290 block, which is handled by resolve_code. */
12293 resolve_types (gfc_namespace *ns)
12299 gfc_namespace* old_ns = gfc_current_ns;
12301 /* Check that all IMPLICIT types are ok. */
12302 if (!ns->seen_implicit_none)
12305 for (letter = 0; letter != GFC_LETTERS; ++letter)
12306 if (ns->set_flag[letter]
12307 && resolve_typespec_used (&ns->default_type[letter],
12308 &ns->implicit_loc[letter],
12313 gfc_current_ns = ns;
12315 resolve_entries (ns);
12317 resolve_common_vars (ns->blank_common.head, false);
12318 resolve_common_blocks (ns->common_root);
12320 resolve_contained_functions (ns);
12322 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12324 for (cl = ns->cl_list; cl; cl = cl->next)
12325 resolve_charlen (cl);
12327 gfc_traverse_ns (ns, resolve_symbol);
12329 resolve_fntype (ns);
12331 for (n = ns->contained; n; n = n->sibling)
12333 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12334 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12335 "also be PURE", n->proc_name->name,
12336 &n->proc_name->declared_at);
12342 gfc_check_interfaces (ns);
12344 gfc_traverse_ns (ns, resolve_values);
12350 for (d = ns->data; d; d = d->next)
12354 gfc_traverse_ns (ns, gfc_formalize_init_value);
12356 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12358 if (ns->common_root != NULL)
12359 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12361 for (eq = ns->equiv; eq; eq = eq->next)
12362 resolve_equivalence (eq);
12364 /* Warn about unused labels. */
12365 if (warn_unused_label)
12366 warn_unused_fortran_label (ns->st_labels);
12368 gfc_resolve_uops (ns->uop_root);
12370 gfc_current_ns = old_ns;
12374 /* Call resolve_code recursively. */
12377 resolve_codes (gfc_namespace *ns)
12380 bitmap_obstack old_obstack;
12382 for (n = ns->contained; n; n = n->sibling)
12385 gfc_current_ns = ns;
12387 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
12388 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
12391 /* Set to an out of range value. */
12392 current_entry_id = -1;
12394 old_obstack = labels_obstack;
12395 bitmap_obstack_initialize (&labels_obstack);
12397 resolve_code (ns->code, ns);
12399 bitmap_obstack_release (&labels_obstack);
12400 labels_obstack = old_obstack;
12404 /* This function is called after a complete program unit has been compiled.
12405 Its purpose is to examine all of the expressions associated with a program
12406 unit, assign types to all intermediate expressions, make sure that all
12407 assignments are to compatible types and figure out which names refer to
12408 which functions or subroutines. */
12411 gfc_resolve (gfc_namespace *ns)
12413 gfc_namespace *old_ns;
12414 code_stack *old_cs_base;
12420 old_ns = gfc_current_ns;
12421 old_cs_base = cs_base;
12423 resolve_types (ns);
12424 resolve_codes (ns);
12426 gfc_current_ns = old_ns;
12427 cs_base = old_cs_base;