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)
3961 ts.type = BT_INTEGER;
3962 ts.kind = gfc_index_integer_kind;
3964 gfc_convert_type_warn (dim, &ts, 2, 0);
3970 /* Given an expression that contains array references, update those array
3971 references to point to the right array specifications. While this is
3972 filled in during matching, this information is difficult to save and load
3973 in a module, so we take care of it here.
3975 The idea here is that the original array reference comes from the
3976 base symbol. We traverse the list of reference structures, setting
3977 the stored reference to references. Component references can
3978 provide an additional array specification. */
3981 find_array_spec (gfc_expr *e)
3985 gfc_symbol *derived;
3988 if (e->symtree->n.sym->ts.type == BT_CLASS)
3989 as = e->symtree->n.sym->ts.u.derived->components->as;
3991 as = e->symtree->n.sym->as;
3994 for (ref = e->ref; ref; ref = ref->next)
3999 gfc_internal_error ("find_array_spec(): Missing spec");
4006 if (derived == NULL)
4007 derived = e->symtree->n.sym->ts.u.derived;
4009 c = derived->components;
4011 for (; c; c = c->next)
4012 if (c == ref->u.c.component)
4014 /* Track the sequence of component references. */
4015 if (c->ts.type == BT_DERIVED)
4016 derived = c->ts.u.derived;
4021 gfc_internal_error ("find_array_spec(): Component not found");
4023 if (c->attr.dimension)
4026 gfc_internal_error ("find_array_spec(): unused as(1)");
4037 gfc_internal_error ("find_array_spec(): unused as(2)");
4041 /* Resolve an array reference. */
4044 resolve_array_ref (gfc_array_ref *ar)
4046 int i, check_scalar;
4049 for (i = 0; i < ar->dimen; i++)
4051 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4053 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
4055 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4057 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4062 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4066 ar->dimen_type[i] = DIMEN_ELEMENT;
4070 ar->dimen_type[i] = DIMEN_VECTOR;
4071 if (e->expr_type == EXPR_VARIABLE
4072 && e->symtree->n.sym->ts.type == BT_DERIVED)
4073 ar->start[i] = gfc_get_parentheses (e);
4077 gfc_error ("Array index at %L is an array of rank %d",
4078 &ar->c_where[i], e->rank);
4083 /* If the reference type is unknown, figure out what kind it is. */
4085 if (ar->type == AR_UNKNOWN)
4087 ar->type = AR_ELEMENT;
4088 for (i = 0; i < ar->dimen; i++)
4089 if (ar->dimen_type[i] == DIMEN_RANGE
4090 || ar->dimen_type[i] == DIMEN_VECTOR)
4092 ar->type = AR_SECTION;
4097 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4105 resolve_substring (gfc_ref *ref)
4107 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4109 if (ref->u.ss.start != NULL)
4111 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4114 if (ref->u.ss.start->ts.type != BT_INTEGER)
4116 gfc_error ("Substring start index at %L must be of type INTEGER",
4117 &ref->u.ss.start->where);
4121 if (ref->u.ss.start->rank != 0)
4123 gfc_error ("Substring start index at %L must be scalar",
4124 &ref->u.ss.start->where);
4128 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4129 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4130 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4132 gfc_error ("Substring start index at %L is less than one",
4133 &ref->u.ss.start->where);
4138 if (ref->u.ss.end != NULL)
4140 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4143 if (ref->u.ss.end->ts.type != BT_INTEGER)
4145 gfc_error ("Substring end index at %L must be of type INTEGER",
4146 &ref->u.ss.end->where);
4150 if (ref->u.ss.end->rank != 0)
4152 gfc_error ("Substring end index at %L must be scalar",
4153 &ref->u.ss.end->where);
4157 if (ref->u.ss.length != NULL
4158 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4159 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4160 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4162 gfc_error ("Substring end index at %L exceeds the string length",
4163 &ref->u.ss.start->where);
4167 if (compare_bound_mpz_t (ref->u.ss.end,
4168 gfc_integer_kinds[k].huge) == CMP_GT
4169 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4170 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4172 gfc_error ("Substring end index at %L is too large",
4173 &ref->u.ss.end->where);
4182 /* This function supplies missing substring charlens. */
4185 gfc_resolve_substring_charlen (gfc_expr *e)
4188 gfc_expr *start, *end;
4190 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4191 if (char_ref->type == REF_SUBSTRING)
4197 gcc_assert (char_ref->next == NULL);
4201 if (e->ts.u.cl->length)
4202 gfc_free_expr (e->ts.u.cl->length);
4203 else if (e->expr_type == EXPR_VARIABLE
4204 && e->symtree->n.sym->attr.dummy)
4208 e->ts.type = BT_CHARACTER;
4209 e->ts.kind = gfc_default_character_kind;
4212 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4214 if (char_ref->u.ss.start)
4215 start = gfc_copy_expr (char_ref->u.ss.start);
4217 start = gfc_int_expr (1);
4219 if (char_ref->u.ss.end)
4220 end = gfc_copy_expr (char_ref->u.ss.end);
4221 else if (e->expr_type == EXPR_VARIABLE)
4222 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4229 /* Length = (end - start +1). */
4230 e->ts.u.cl->length = gfc_subtract (end, start);
4231 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length, gfc_int_expr (1));
4233 e->ts.u.cl->length->ts.type = BT_INTEGER;
4234 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4236 /* Make sure that the length is simplified. */
4237 gfc_simplify_expr (e->ts.u.cl->length, 1);
4238 gfc_resolve_expr (e->ts.u.cl->length);
4242 /* Resolve subtype references. */
4245 resolve_ref (gfc_expr *expr)
4247 int current_part_dimension, n_components, seen_part_dimension;
4250 for (ref = expr->ref; ref; ref = ref->next)
4251 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4253 find_array_spec (expr);
4257 for (ref = expr->ref; ref; ref = ref->next)
4261 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4269 resolve_substring (ref);
4273 /* Check constraints on part references. */
4275 current_part_dimension = 0;
4276 seen_part_dimension = 0;
4279 for (ref = expr->ref; ref; ref = ref->next)
4284 switch (ref->u.ar.type)
4288 current_part_dimension = 1;
4292 current_part_dimension = 0;
4296 gfc_internal_error ("resolve_ref(): Bad array reference");
4302 if (current_part_dimension || seen_part_dimension)
4305 if (ref->u.c.component->attr.pointer
4306 || ref->u.c.component->attr.proc_pointer)
4308 gfc_error ("Component to the right of a part reference "
4309 "with nonzero rank must not have the POINTER "
4310 "attribute at %L", &expr->where);
4313 else if (ref->u.c.component->attr.allocatable)
4315 gfc_error ("Component to the right of a part reference "
4316 "with nonzero rank must not have the ALLOCATABLE "
4317 "attribute at %L", &expr->where);
4329 if (((ref->type == REF_COMPONENT && n_components > 1)
4330 || ref->next == NULL)
4331 && current_part_dimension
4332 && seen_part_dimension)
4334 gfc_error ("Two or more part references with nonzero rank must "
4335 "not be specified at %L", &expr->where);
4339 if (ref->type == REF_COMPONENT)
4341 if (current_part_dimension)
4342 seen_part_dimension = 1;
4344 /* reset to make sure */
4345 current_part_dimension = 0;
4353 /* Given an expression, determine its shape. This is easier than it sounds.
4354 Leaves the shape array NULL if it is not possible to determine the shape. */
4357 expression_shape (gfc_expr *e)
4359 mpz_t array[GFC_MAX_DIMENSIONS];
4362 if (e->rank == 0 || e->shape != NULL)
4365 for (i = 0; i < e->rank; i++)
4366 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4369 e->shape = gfc_get_shape (e->rank);
4371 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4376 for (i--; i >= 0; i--)
4377 mpz_clear (array[i]);
4381 /* Given a variable expression node, compute the rank of the expression by
4382 examining the base symbol and any reference structures it may have. */
4385 expression_rank (gfc_expr *e)
4390 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4391 could lead to serious confusion... */
4392 gcc_assert (e->expr_type != EXPR_COMPCALL);
4396 if (e->expr_type == EXPR_ARRAY)
4398 /* Constructors can have a rank different from one via RESHAPE(). */
4400 if (e->symtree == NULL)
4406 e->rank = (e->symtree->n.sym->as == NULL)
4407 ? 0 : e->symtree->n.sym->as->rank;
4413 for (ref = e->ref; ref; ref = ref->next)
4415 if (ref->type != REF_ARRAY)
4418 if (ref->u.ar.type == AR_FULL)
4420 rank = ref->u.ar.as->rank;
4424 if (ref->u.ar.type == AR_SECTION)
4426 /* Figure out the rank of the section. */
4428 gfc_internal_error ("expression_rank(): Two array specs");
4430 for (i = 0; i < ref->u.ar.dimen; i++)
4431 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4432 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4442 expression_shape (e);
4446 /* Resolve a variable expression. */
4449 resolve_variable (gfc_expr *e)
4456 if (e->symtree == NULL)
4459 if (e->ref && resolve_ref (e) == FAILURE)
4462 sym = e->symtree->n.sym;
4463 if (sym->attr.flavor == FL_PROCEDURE
4464 && (!sym->attr.function
4465 || (sym->attr.function && sym->result
4466 && sym->result->attr.proc_pointer
4467 && !sym->result->attr.function)))
4469 e->ts.type = BT_PROCEDURE;
4470 goto resolve_procedure;
4473 if (sym->ts.type != BT_UNKNOWN)
4474 gfc_variable_attr (e, &e->ts);
4477 /* Must be a simple variable reference. */
4478 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4483 if (check_assumed_size_reference (sym, e))
4486 /* Deal with forward references to entries during resolve_code, to
4487 satisfy, at least partially, 12.5.2.5. */
4488 if (gfc_current_ns->entries
4489 && current_entry_id == sym->entry_id
4492 && cs_base->current->op != EXEC_ENTRY)
4494 gfc_entry_list *entry;
4495 gfc_formal_arglist *formal;
4499 /* If the symbol is a dummy... */
4500 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4502 entry = gfc_current_ns->entries;
4505 /* ...test if the symbol is a parameter of previous entries. */
4506 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4507 for (formal = entry->sym->formal; formal; formal = formal->next)
4509 if (formal->sym && sym->name == formal->sym->name)
4513 /* If it has not been seen as a dummy, this is an error. */
4516 if (specification_expr)
4517 gfc_error ("Variable '%s', used in a specification expression"
4518 ", is referenced at %L before the ENTRY statement "
4519 "in which it is a parameter",
4520 sym->name, &cs_base->current->loc);
4522 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4523 "statement in which it is a parameter",
4524 sym->name, &cs_base->current->loc);
4529 /* Now do the same check on the specification expressions. */
4530 specification_expr = 1;
4531 if (sym->ts.type == BT_CHARACTER
4532 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4536 for (n = 0; n < sym->as->rank; n++)
4538 specification_expr = 1;
4539 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4541 specification_expr = 1;
4542 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4545 specification_expr = 0;
4548 /* Update the symbol's entry level. */
4549 sym->entry_id = current_entry_id + 1;
4553 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4560 /* Checks to see that the correct symbol has been host associated.
4561 The only situation where this arises is that in which a twice
4562 contained function is parsed after the host association is made.
4563 Therefore, on detecting this, change the symbol in the expression
4564 and convert the array reference into an actual arglist if the old
4565 symbol is a variable. */
4567 check_host_association (gfc_expr *e)
4569 gfc_symbol *sym, *old_sym;
4573 gfc_actual_arglist *arg, *tail = NULL;
4574 bool retval = e->expr_type == EXPR_FUNCTION;
4576 /* If the expression is the result of substitution in
4577 interface.c(gfc_extend_expr) because there is no way in
4578 which the host association can be wrong. */
4579 if (e->symtree == NULL
4580 || e->symtree->n.sym == NULL
4581 || e->user_operator)
4584 old_sym = e->symtree->n.sym;
4586 if (gfc_current_ns->parent
4587 && old_sym->ns != gfc_current_ns)
4589 /* Use the 'USE' name so that renamed module symbols are
4590 correctly handled. */
4591 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4593 if (sym && old_sym != sym
4594 && sym->ts.type == old_sym->ts.type
4595 && sym->attr.flavor == FL_PROCEDURE
4596 && sym->attr.contained)
4598 /* Clear the shape, since it might not be valid. */
4599 if (e->shape != NULL)
4601 for (n = 0; n < e->rank; n++)
4602 mpz_clear (e->shape[n]);
4604 gfc_free (e->shape);
4607 /* Give the expression the right symtree! */
4608 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4609 gcc_assert (st != NULL);
4611 if (old_sym->attr.flavor == FL_PROCEDURE
4612 || e->expr_type == EXPR_FUNCTION)
4614 /* Original was function so point to the new symbol, since
4615 the actual argument list is already attached to the
4617 e->value.function.esym = NULL;
4622 /* Original was variable so convert array references into
4623 an actual arglist. This does not need any checking now
4624 since gfc_resolve_function will take care of it. */
4625 e->value.function.actual = NULL;
4626 e->expr_type = EXPR_FUNCTION;
4629 /* Ambiguity will not arise if the array reference is not
4630 the last reference. */
4631 for (ref = e->ref; ref; ref = ref->next)
4632 if (ref->type == REF_ARRAY && ref->next == NULL)
4635 gcc_assert (ref->type == REF_ARRAY);
4637 /* Grab the start expressions from the array ref and
4638 copy them into actual arguments. */
4639 for (n = 0; n < ref->u.ar.dimen; n++)
4641 arg = gfc_get_actual_arglist ();
4642 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4643 if (e->value.function.actual == NULL)
4644 tail = e->value.function.actual = arg;
4652 /* Dump the reference list and set the rank. */
4653 gfc_free_ref_list (e->ref);
4655 e->rank = sym->as ? sym->as->rank : 0;
4658 gfc_resolve_expr (e);
4662 /* This might have changed! */
4663 return e->expr_type == EXPR_FUNCTION;
4668 gfc_resolve_character_operator (gfc_expr *e)
4670 gfc_expr *op1 = e->value.op.op1;
4671 gfc_expr *op2 = e->value.op.op2;
4672 gfc_expr *e1 = NULL;
4673 gfc_expr *e2 = NULL;
4675 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4677 if (op1->ts.u.cl && op1->ts.u.cl->length)
4678 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4679 else if (op1->expr_type == EXPR_CONSTANT)
4680 e1 = gfc_int_expr (op1->value.character.length);
4682 if (op2->ts.u.cl && op2->ts.u.cl->length)
4683 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4684 else if (op2->expr_type == EXPR_CONSTANT)
4685 e2 = gfc_int_expr (op2->value.character.length);
4687 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4692 e->ts.u.cl->length = gfc_add (e1, e2);
4693 e->ts.u.cl->length->ts.type = BT_INTEGER;
4694 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4695 gfc_simplify_expr (e->ts.u.cl->length, 0);
4696 gfc_resolve_expr (e->ts.u.cl->length);
4702 /* Ensure that an character expression has a charlen and, if possible, a
4703 length expression. */
4706 fixup_charlen (gfc_expr *e)
4708 /* The cases fall through so that changes in expression type and the need
4709 for multiple fixes are picked up. In all circumstances, a charlen should
4710 be available for the middle end to hang a backend_decl on. */
4711 switch (e->expr_type)
4714 gfc_resolve_character_operator (e);
4717 if (e->expr_type == EXPR_ARRAY)
4718 gfc_resolve_character_array_constructor (e);
4720 case EXPR_SUBSTRING:
4721 if (!e->ts.u.cl && e->ref)
4722 gfc_resolve_substring_charlen (e);
4726 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4733 /* Update an actual argument to include the passed-object for type-bound
4734 procedures at the right position. */
4736 static gfc_actual_arglist*
4737 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
4740 gcc_assert (argpos > 0);
4744 gfc_actual_arglist* result;
4746 result = gfc_get_actual_arglist ();
4750 result->name = name;
4756 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
4758 lst = update_arglist_pass (NULL, po, argpos - 1, name);
4763 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4766 extract_compcall_passed_object (gfc_expr* e)
4770 gcc_assert (e->expr_type == EXPR_COMPCALL);
4772 if (e->value.compcall.base_object)
4773 po = gfc_copy_expr (e->value.compcall.base_object);
4776 po = gfc_get_expr ();
4777 po->expr_type = EXPR_VARIABLE;
4778 po->symtree = e->symtree;
4779 po->ref = gfc_copy_ref (e->ref);
4780 po->where = e->where;
4783 if (gfc_resolve_expr (po) == FAILURE)
4790 /* Update the arglist of an EXPR_COMPCALL expression to include the
4794 update_compcall_arglist (gfc_expr* e)
4797 gfc_typebound_proc* tbp;
4799 tbp = e->value.compcall.tbp;
4804 po = extract_compcall_passed_object (e);
4808 if (tbp->nopass || e->value.compcall.ignore_pass)
4814 gcc_assert (tbp->pass_arg_num > 0);
4815 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4823 /* Extract the passed object from a PPC call (a copy of it). */
4826 extract_ppc_passed_object (gfc_expr *e)
4831 po = gfc_get_expr ();
4832 po->expr_type = EXPR_VARIABLE;
4833 po->symtree = e->symtree;
4834 po->ref = gfc_copy_ref (e->ref);
4835 po->where = e->where;
4837 /* Remove PPC reference. */
4839 while ((*ref)->next)
4840 ref = &(*ref)->next;
4841 gfc_free_ref_list (*ref);
4844 if (gfc_resolve_expr (po) == FAILURE)
4851 /* Update the actual arglist of a procedure pointer component to include the
4855 update_ppc_arglist (gfc_expr* e)
4859 gfc_typebound_proc* tb;
4861 if (!gfc_is_proc_ptr_comp (e, &ppc))
4868 else if (tb->nopass)
4871 po = extract_ppc_passed_object (e);
4877 gfc_error ("Passed-object at %L must be scalar", &e->where);
4881 gcc_assert (tb->pass_arg_num > 0);
4882 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4890 /* Check that the object a TBP is called on is valid, i.e. it must not be
4891 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
4894 check_typebound_baseobject (gfc_expr* e)
4898 base = extract_compcall_passed_object (e);
4902 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
4904 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
4906 gfc_error ("Base object for type-bound procedure call at %L is of"
4907 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
4911 /* If the procedure called is NOPASS, the base object must be scalar. */
4912 if (e->value.compcall.tbp->nopass && base->rank > 0)
4914 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
4915 " be scalar", &e->where);
4919 /* FIXME: Remove once PR 41177 (this problem) is fixed completely. */
4922 gfc_error ("Non-scalar base object at %L currently not implemented",
4931 /* Resolve a call to a type-bound procedure, either function or subroutine,
4932 statically from the data in an EXPR_COMPCALL expression. The adapted
4933 arglist and the target-procedure symtree are returned. */
4936 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
4937 gfc_actual_arglist** actual)
4939 gcc_assert (e->expr_type == EXPR_COMPCALL);
4940 gcc_assert (!e->value.compcall.tbp->is_generic);
4942 /* Update the actual arglist for PASS. */
4943 if (update_compcall_arglist (e) == FAILURE)
4946 *actual = e->value.compcall.actual;
4947 *target = e->value.compcall.tbp->u.specific;
4949 gfc_free_ref_list (e->ref);
4951 e->value.compcall.actual = NULL;
4957 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
4958 which of the specific bindings (if any) matches the arglist and transform
4959 the expression into a call of that binding. */
4962 resolve_typebound_generic_call (gfc_expr* e)
4964 gfc_typebound_proc* genproc;
4965 const char* genname;
4967 gcc_assert (e->expr_type == EXPR_COMPCALL);
4968 genname = e->value.compcall.name;
4969 genproc = e->value.compcall.tbp;
4971 if (!genproc->is_generic)
4974 /* Try the bindings on this type and in the inheritance hierarchy. */
4975 for (; genproc; genproc = genproc->overridden)
4979 gcc_assert (genproc->is_generic);
4980 for (g = genproc->u.generic; g; g = g->next)
4983 gfc_actual_arglist* args;
4986 gcc_assert (g->specific);
4988 if (g->specific->error)
4991 target = g->specific->u.specific->n.sym;
4993 /* Get the right arglist by handling PASS/NOPASS. */
4994 args = gfc_copy_actual_arglist (e->value.compcall.actual);
4995 if (!g->specific->nopass)
4998 po = extract_compcall_passed_object (e);
5002 gcc_assert (g->specific->pass_arg_num > 0);
5003 gcc_assert (!g->specific->error);
5004 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5005 g->specific->pass_arg);
5007 resolve_actual_arglist (args, target->attr.proc,
5008 is_external_proc (target) && !target->formal);
5010 /* Check if this arglist matches the formal. */
5011 matches = gfc_arglist_matches_symbol (&args, target);
5013 /* Clean up and break out of the loop if we've found it. */
5014 gfc_free_actual_arglist (args);
5017 e->value.compcall.tbp = g->specific;
5023 /* Nothing matching found! */
5024 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5025 " '%s' at %L", genname, &e->where);
5033 /* Resolve a call to a type-bound subroutine. */
5036 resolve_typebound_call (gfc_code* c)
5038 gfc_actual_arglist* newactual;
5039 gfc_symtree* target;
5041 /* Check that's really a SUBROUTINE. */
5042 if (!c->expr1->value.compcall.tbp->subroutine)
5044 gfc_error ("'%s' at %L should be a SUBROUTINE",
5045 c->expr1->value.compcall.name, &c->loc);
5049 if (check_typebound_baseobject (c->expr1) == FAILURE)
5052 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
5055 /* Transform into an ordinary EXEC_CALL for now. */
5057 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5060 c->ext.actual = newactual;
5061 c->symtree = target;
5062 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5064 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5066 gfc_free_expr (c->expr1);
5067 c->expr1 = gfc_get_expr ();
5068 c->expr1->expr_type = EXPR_FUNCTION;
5069 c->expr1->symtree = target;
5070 c->expr1->where = c->loc;
5072 return resolve_call (c);
5076 /* Resolve a component-call expression. This originally was intended
5077 only to see functions. However, it is convenient to use it in
5078 resolving subroutine class methods, since we do not have to add a
5079 gfc_code each time. */
5081 resolve_compcall (gfc_expr* e, bool fcn)
5083 gfc_actual_arglist* newactual;
5084 gfc_symtree* target;
5086 /* Check that's really a FUNCTION. */
5087 if (fcn && !e->value.compcall.tbp->function)
5089 gfc_error ("'%s' at %L should be a FUNCTION",
5090 e->value.compcall.name, &e->where);
5093 else if (!fcn && !e->value.compcall.tbp->subroutine)
5095 /* To resolve class member calls, we borrow this bit
5096 of code to select the specific procedures. */
5097 gfc_error ("'%s' at %L should be a SUBROUTINE",
5098 e->value.compcall.name, &e->where);
5102 /* These must not be assign-calls! */
5103 gcc_assert (!e->value.compcall.assign);
5105 if (check_typebound_baseobject (e) == FAILURE)
5108 if (resolve_typebound_generic_call (e) == FAILURE)
5110 gcc_assert (!e->value.compcall.tbp->is_generic);
5112 /* Take the rank from the function's symbol. */
5113 if (e->value.compcall.tbp->u.specific->n.sym->as)
5114 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5116 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5117 arglist to the TBP's binding target. */
5119 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5122 e->value.function.actual = newactual;
5123 e->value.function.name = e->value.compcall.name;
5124 e->value.function.esym = target->n.sym;
5125 e->value.function.class_esym = NULL;
5126 e->value.function.isym = NULL;
5127 e->symtree = target;
5128 e->ts = target->n.sym->ts;
5129 e->expr_type = EXPR_FUNCTION;
5131 /* Resolution is not necessary if this is a class subroutine; this
5132 function only has to identify the specific proc. Resolution of
5133 the call will be done next in resolve_typebound_call. */
5134 return fcn ? gfc_resolve_expr (e) : SUCCESS;
5138 /* Resolve a typebound call for the members in a class. This group of
5139 functions implements dynamic dispatch in the provisional version
5140 of f03 OOP. As soon as vtables are in place and contain pointers
5141 to methods, this will no longer be necessary. */
5142 static gfc_expr *list_e;
5143 static void check_class_members (gfc_symbol *);
5144 static gfc_try class_try;
5145 static bool fcn_flag;
5146 static gfc_symbol *class_object;
5150 check_members (gfc_symbol *derived)
5152 if (derived->attr.flavor == FL_DERIVED)
5153 check_class_members (derived);
5158 check_class_members (gfc_symbol *derived)
5162 gfc_class_esym_list *etmp;
5164 e = gfc_copy_expr (list_e);
5166 tbp = gfc_find_typebound_proc (derived, &class_try,
5167 e->value.compcall.name,
5172 gfc_error ("no typebound available procedure named '%s' at %L",
5173 e->value.compcall.name, &e->where);
5177 if (tbp->n.tb->is_generic)
5179 /* If we have to match a passed class member, force the actual
5180 expression to have the correct type. */
5181 if (!tbp->n.tb->nopass)
5183 if (e->value.compcall.base_object == NULL)
5184 e->value.compcall.base_object =
5185 extract_compcall_passed_object (e);
5187 e->value.compcall.base_object->ts.type = BT_DERIVED;
5188 e->value.compcall.base_object->ts.u.derived = derived;
5192 e->value.compcall.tbp = tbp->n.tb;
5193 e->value.compcall.name = tbp->name;
5195 /* Let the original expresssion catch the assertion in
5196 resolve_compcall, since this flag does not appear to be reset or
5197 copied in some systems. */
5198 e->value.compcall.assign = 0;
5200 /* Do the renaming, PASSing, generic => specific and other
5201 good things for each class member. */
5202 class_try = (resolve_compcall (e, fcn_flag) == SUCCESS)
5203 ? class_try : FAILURE;
5205 /* Now transfer the found symbol to the esym list. */
5206 if (class_try == SUCCESS)
5208 etmp = list_e->value.function.class_esym;
5209 list_e->value.function.class_esym
5210 = gfc_get_class_esym_list();
5211 list_e->value.function.class_esym->next = etmp;
5212 list_e->value.function.class_esym->derived = derived;
5213 list_e->value.function.class_esym->esym
5214 = e->value.function.esym;
5219 /* Burrow down into grandchildren types. */
5220 if (derived->f2k_derived)
5221 gfc_traverse_ns (derived->f2k_derived, check_members);
5225 /* Eliminate esym_lists where all the members point to the
5226 typebound procedure of the declared type; ie. one where
5227 type selection has no effect.. */
5229 resolve_class_esym (gfc_expr *e)
5231 gfc_class_esym_list *p, *q;
5234 gcc_assert (e && e->expr_type == EXPR_FUNCTION);
5236 p = e->value.function.class_esym;
5240 for (; p; p = p->next)
5241 empty = empty && (e->value.function.esym == p->esym);
5245 p = e->value.function.class_esym;
5251 e->value.function.class_esym = NULL;
5256 /* Generate an expression for the hash value, given the reference to
5257 the class of the final expression (class_ref), the base of the
5258 full reference list (new_ref), the declared type and the class
5261 hash_value_expr (gfc_ref *class_ref, gfc_ref *new_ref, gfc_symtree *st)
5263 gfc_expr *hash_value;
5265 /* Build an expression for the correct hash_value; ie. that of the last
5269 class_ref->next = NULL;
5273 gfc_free_ref_list (new_ref);
5276 hash_value = gfc_get_expr ();
5277 hash_value->expr_type = EXPR_VARIABLE;
5278 hash_value->symtree = st;
5279 hash_value->symtree->n.sym->refs++;
5280 hash_value->ref = new_ref;
5281 gfc_add_component_ref (hash_value, "$vptr");
5282 gfc_add_component_ref (hash_value, "$hash");
5288 /* Get the ultimate declared type from an expression. In addition,
5289 return the last class/derived type reference and the copy of the
5292 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5295 gfc_symbol *declared;
5300 *new_ref = gfc_copy_ref (e->ref);
5301 for (ref = *new_ref; ref; ref = ref->next)
5303 if (ref->type != REF_COMPONENT)
5306 if (ref->u.c.component->ts.type == BT_CLASS
5307 || ref->u.c.component->ts.type == BT_DERIVED)
5309 declared = ref->u.c.component->ts.u.derived;
5314 if (declared == NULL)
5315 declared = e->symtree->n.sym->ts.u.derived;
5321 /* Resolve the argument expressions so that any arguments expressions
5322 that include class methods are resolved before the current call.
5323 This is necessary because of the static variables used in CLASS
5324 method resolution. */
5326 resolve_arg_exprs (gfc_actual_arglist *arg)
5328 /* Resolve the actual arglist expressions. */
5329 for (; arg; arg = arg->next)
5332 gfc_resolve_expr (arg->expr);
5337 /* Resolve a CLASS typebound function, or 'method'. */
5339 resolve_class_compcall (gfc_expr* e)
5341 gfc_symbol *derived, *declared;
5347 class_object = st->n.sym;
5349 /* Get the CLASS declared type. */
5350 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5352 /* Weed out cases of the ultimate component being a derived type. */
5353 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5355 gfc_free_ref_list (new_ref);
5356 return resolve_compcall (e, true);
5359 /* Resolve the argument expressions, */
5360 resolve_arg_exprs (e->value.function.actual);
5362 /* Get the data component, which is of the declared type. */
5363 derived = declared->components->ts.u.derived;
5365 /* Resolve the function call for each member of the class. */
5366 class_try = SUCCESS;
5368 list_e = gfc_copy_expr (e);
5369 check_class_members (derived);
5371 class_try = (resolve_compcall (e, true) == SUCCESS)
5372 ? class_try : FAILURE;
5374 /* Transfer the class list to the original expression. Note that
5375 the class_esym list is cleaned up in trans-expr.c, as the calls
5377 e->value.function.class_esym = list_e->value.function.class_esym;
5378 list_e->value.function.class_esym = NULL;
5379 gfc_free_expr (list_e);
5381 resolve_class_esym (e);
5383 /* More than one typebound procedure so transmit an expression for
5384 the hash_value as the selector. */
5385 if (e->value.function.class_esym != NULL)
5386 e->value.function.class_esym->hash_value
5387 = hash_value_expr (class_ref, new_ref, st);
5392 /* Resolve a CLASS typebound subroutine, or 'method'. */
5394 resolve_class_typebound_call (gfc_code *code)
5396 gfc_symbol *derived, *declared;
5401 st = code->expr1->symtree;
5402 class_object = st->n.sym;
5404 /* Get the CLASS declared type. */
5405 declared = get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5407 /* Weed out cases of the ultimate component being a derived type. */
5408 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5410 gfc_free_ref_list (new_ref);
5411 return resolve_typebound_call (code);
5414 /* Resolve the argument expressions, */
5415 resolve_arg_exprs (code->expr1->value.compcall.actual);
5417 /* Get the data component, which is of the declared type. */
5418 derived = declared->components->ts.u.derived;
5420 class_try = SUCCESS;
5422 list_e = gfc_copy_expr (code->expr1);
5423 check_class_members (derived);
5425 class_try = (resolve_typebound_call (code) == SUCCESS)
5426 ? class_try : FAILURE;
5428 /* Transfer the class list to the original expression. Note that
5429 the class_esym list is cleaned up in trans-expr.c, as the calls
5431 code->expr1->value.function.class_esym
5432 = list_e->value.function.class_esym;
5433 list_e->value.function.class_esym = NULL;
5434 gfc_free_expr (list_e);
5436 resolve_class_esym (code->expr1);
5438 /* More than one typebound procedure so transmit an expression for
5439 the hash_value as the selector. */
5440 if (code->expr1->value.function.class_esym != NULL)
5441 code->expr1->value.function.class_esym->hash_value
5442 = hash_value_expr (class_ref, new_ref, st);
5448 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5451 resolve_ppc_call (gfc_code* c)
5453 gfc_component *comp;
5456 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5459 c->resolved_sym = c->expr1->symtree->n.sym;
5460 c->expr1->expr_type = EXPR_VARIABLE;
5462 if (!comp->attr.subroutine)
5463 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5465 if (resolve_ref (c->expr1) == FAILURE)
5468 if (update_ppc_arglist (c->expr1) == FAILURE)
5471 c->ext.actual = c->expr1->value.compcall.actual;
5473 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5474 comp->formal == NULL) == FAILURE)
5477 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5483 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5486 resolve_expr_ppc (gfc_expr* e)
5488 gfc_component *comp;
5491 b = gfc_is_proc_ptr_comp (e, &comp);
5494 /* Convert to EXPR_FUNCTION. */
5495 e->expr_type = EXPR_FUNCTION;
5496 e->value.function.isym = NULL;
5497 e->value.function.actual = e->value.compcall.actual;
5499 if (comp->as != NULL)
5500 e->rank = comp->as->rank;
5502 if (!comp->attr.function)
5503 gfc_add_function (&comp->attr, comp->name, &e->where);
5505 if (resolve_ref (e) == FAILURE)
5508 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5509 comp->formal == NULL) == FAILURE)
5512 if (update_ppc_arglist (e) == FAILURE)
5515 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5522 gfc_is_expandable_expr (gfc_expr *e)
5524 gfc_constructor *con;
5526 if (e->expr_type == EXPR_ARRAY)
5528 /* Traverse the constructor looking for variables that are flavor
5529 parameter. Parameters must be expanded since they are fully used at
5531 for (con = e->value.constructor; con; con = con->next)
5533 if (con->expr->expr_type == EXPR_VARIABLE
5534 && con->expr->symtree
5535 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
5536 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
5538 if (con->expr->expr_type == EXPR_ARRAY
5539 && gfc_is_expandable_expr (con->expr))
5547 /* Resolve an expression. That is, make sure that types of operands agree
5548 with their operators, intrinsic operators are converted to function calls
5549 for overloaded types and unresolved function references are resolved. */
5552 gfc_resolve_expr (gfc_expr *e)
5559 switch (e->expr_type)
5562 t = resolve_operator (e);
5568 if (check_host_association (e))
5569 t = resolve_function (e);
5572 t = resolve_variable (e);
5574 expression_rank (e);
5577 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5578 && e->ref->type != REF_SUBSTRING)
5579 gfc_resolve_substring_charlen (e);
5584 if (e->symtree && e->symtree->n.sym->ts.type == BT_CLASS)
5585 t = resolve_class_compcall (e);
5587 t = resolve_compcall (e, true);
5590 case EXPR_SUBSTRING:
5591 t = resolve_ref (e);
5600 t = resolve_expr_ppc (e);
5605 if (resolve_ref (e) == FAILURE)
5608 t = gfc_resolve_array_constructor (e);
5609 /* Also try to expand a constructor. */
5612 expression_rank (e);
5613 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
5614 gfc_expand_constructor (e);
5617 /* This provides the opportunity for the length of constructors with
5618 character valued function elements to propagate the string length
5619 to the expression. */
5620 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5622 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
5623 here rather then add a duplicate test for it above. */
5624 gfc_expand_constructor (e);
5625 t = gfc_resolve_character_array_constructor (e);
5630 case EXPR_STRUCTURE:
5631 t = resolve_ref (e);
5635 t = resolve_structure_cons (e);
5639 t = gfc_simplify_expr (e, 0);
5643 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5646 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5653 /* Resolve an expression from an iterator. They must be scalar and have
5654 INTEGER or (optionally) REAL type. */
5657 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5658 const char *name_msgid)
5660 if (gfc_resolve_expr (expr) == FAILURE)
5663 if (expr->rank != 0)
5665 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5669 if (expr->ts.type != BT_INTEGER)
5671 if (expr->ts.type == BT_REAL)
5674 return gfc_notify_std (GFC_STD_F95_DEL,
5675 "Deleted feature: %s at %L must be integer",
5676 _(name_msgid), &expr->where);
5679 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5686 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5694 /* Resolve the expressions in an iterator structure. If REAL_OK is
5695 false allow only INTEGER type iterators, otherwise allow REAL types. */
5698 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5700 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5704 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5706 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5711 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5712 "Start expression in DO loop") == FAILURE)
5715 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5716 "End expression in DO loop") == FAILURE)
5719 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5720 "Step expression in DO loop") == FAILURE)
5723 if (iter->step->expr_type == EXPR_CONSTANT)
5725 if ((iter->step->ts.type == BT_INTEGER
5726 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5727 || (iter->step->ts.type == BT_REAL
5728 && mpfr_sgn (iter->step->value.real) == 0))
5730 gfc_error ("Step expression in DO loop at %L cannot be zero",
5731 &iter->step->where);
5736 /* Convert start, end, and step to the same type as var. */
5737 if (iter->start->ts.kind != iter->var->ts.kind
5738 || iter->start->ts.type != iter->var->ts.type)
5739 gfc_convert_type (iter->start, &iter->var->ts, 2);
5741 if (iter->end->ts.kind != iter->var->ts.kind
5742 || iter->end->ts.type != iter->var->ts.type)
5743 gfc_convert_type (iter->end, &iter->var->ts, 2);
5745 if (iter->step->ts.kind != iter->var->ts.kind
5746 || iter->step->ts.type != iter->var->ts.type)
5747 gfc_convert_type (iter->step, &iter->var->ts, 2);
5749 if (iter->start->expr_type == EXPR_CONSTANT
5750 && iter->end->expr_type == EXPR_CONSTANT
5751 && iter->step->expr_type == EXPR_CONSTANT)
5754 if (iter->start->ts.type == BT_INTEGER)
5756 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5757 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5761 sgn = mpfr_sgn (iter->step->value.real);
5762 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5764 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5765 gfc_warning ("DO loop at %L will be executed zero times",
5766 &iter->step->where);
5773 /* Traversal function for find_forall_index. f == 2 signals that
5774 that variable itself is not to be checked - only the references. */
5777 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5779 if (expr->expr_type != EXPR_VARIABLE)
5782 /* A scalar assignment */
5783 if (!expr->ref || *f == 1)
5785 if (expr->symtree->n.sym == sym)
5797 /* Check whether the FORALL index appears in the expression or not.
5798 Returns SUCCESS if SYM is found in EXPR. */
5801 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5803 if (gfc_traverse_expr (expr, sym, forall_index, f))
5810 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5811 to be a scalar INTEGER variable. The subscripts and stride are scalar
5812 INTEGERs, and if stride is a constant it must be nonzero.
5813 Furthermore "A subscript or stride in a forall-triplet-spec shall
5814 not contain a reference to any index-name in the
5815 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5818 resolve_forall_iterators (gfc_forall_iterator *it)
5820 gfc_forall_iterator *iter, *iter2;
5822 for (iter = it; iter; iter = iter->next)
5824 if (gfc_resolve_expr (iter->var) == SUCCESS
5825 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5826 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5829 if (gfc_resolve_expr (iter->start) == SUCCESS
5830 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5831 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5832 &iter->start->where);
5833 if (iter->var->ts.kind != iter->start->ts.kind)
5834 gfc_convert_type (iter->start, &iter->var->ts, 2);
5836 if (gfc_resolve_expr (iter->end) == SUCCESS
5837 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5838 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5840 if (iter->var->ts.kind != iter->end->ts.kind)
5841 gfc_convert_type (iter->end, &iter->var->ts, 2);
5843 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5845 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5846 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5847 &iter->stride->where, "INTEGER");
5849 if (iter->stride->expr_type == EXPR_CONSTANT
5850 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5851 gfc_error ("FORALL stride expression at %L cannot be zero",
5852 &iter->stride->where);
5854 if (iter->var->ts.kind != iter->stride->ts.kind)
5855 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5858 for (iter = it; iter; iter = iter->next)
5859 for (iter2 = iter; iter2; iter2 = iter2->next)
5861 if (find_forall_index (iter2->start,
5862 iter->var->symtree->n.sym, 0) == SUCCESS
5863 || find_forall_index (iter2->end,
5864 iter->var->symtree->n.sym, 0) == SUCCESS
5865 || find_forall_index (iter2->stride,
5866 iter->var->symtree->n.sym, 0) == SUCCESS)
5867 gfc_error ("FORALL index '%s' may not appear in triplet "
5868 "specification at %L", iter->var->symtree->name,
5869 &iter2->start->where);
5874 /* Given a pointer to a symbol that is a derived type, see if it's
5875 inaccessible, i.e. if it's defined in another module and the components are
5876 PRIVATE. The search is recursive if necessary. Returns zero if no
5877 inaccessible components are found, nonzero otherwise. */
5880 derived_inaccessible (gfc_symbol *sym)
5884 if (sym->attr.use_assoc && sym->attr.private_comp)
5887 for (c = sym->components; c; c = c->next)
5889 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
5897 /* Resolve the argument of a deallocate expression. The expression must be
5898 a pointer or a full array. */
5901 resolve_deallocate_expr (gfc_expr *e)
5903 symbol_attribute attr;
5904 int allocatable, pointer, check_intent_in;
5909 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5910 check_intent_in = 1;
5912 if (gfc_resolve_expr (e) == FAILURE)
5915 if (e->expr_type != EXPR_VARIABLE)
5918 sym = e->symtree->n.sym;
5920 if (sym->ts.type == BT_CLASS)
5922 allocatable = sym->ts.u.derived->components->attr.allocatable;
5923 pointer = sym->ts.u.derived->components->attr.pointer;
5927 allocatable = sym->attr.allocatable;
5928 pointer = sym->attr.pointer;
5930 for (ref = e->ref; ref; ref = ref->next)
5933 check_intent_in = 0;
5938 if (ref->u.ar.type != AR_FULL)
5943 c = ref->u.c.component;
5944 if (c->ts.type == BT_CLASS)
5946 allocatable = c->ts.u.derived->components->attr.allocatable;
5947 pointer = c->ts.u.derived->components->attr.pointer;
5951 allocatable = c->attr.allocatable;
5952 pointer = c->attr.pointer;
5962 attr = gfc_expr_attr (e);
5964 if (allocatable == 0 && attr.pointer == 0)
5967 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5971 if (check_intent_in && sym->attr.intent == INTENT_IN)
5973 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5974 sym->name, &e->where);
5978 if (e->ts.type == BT_CLASS)
5980 /* Only deallocate the DATA component. */
5981 gfc_add_component_ref (e, "$data");
5988 /* Returns true if the expression e contains a reference to the symbol sym. */
5990 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5992 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
5999 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6001 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6005 /* Given the expression node e for an allocatable/pointer of derived type to be
6006 allocated, get the expression node to be initialized afterwards (needed for
6007 derived types with default initializers, and derived types with allocatable
6008 components that need nullification.) */
6011 gfc_expr_to_initialize (gfc_expr *e)
6017 result = gfc_copy_expr (e);
6019 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6020 for (ref = result->ref; ref; ref = ref->next)
6021 if (ref->type == REF_ARRAY && ref->next == NULL)
6023 ref->u.ar.type = AR_FULL;
6025 for (i = 0; i < ref->u.ar.dimen; i++)
6026 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6028 result->rank = ref->u.ar.dimen;
6036 /* Used in resolve_allocate_expr to check that a allocation-object and
6037 a source-expr are conformable. This does not catch all possible
6038 cases; in particular a runtime checking is needed. */
6041 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6043 /* First compare rank. */
6044 if (e2->ref && e1->rank != e2->ref->u.ar.as->rank)
6046 gfc_error ("Source-expr at %L must be scalar or have the "
6047 "same rank as the allocate-object at %L",
6048 &e1->where, &e2->where);
6059 for (i = 0; i < e1->rank; i++)
6061 if (e2->ref->u.ar.end[i])
6063 mpz_set (s, e2->ref->u.ar.end[i]->value.integer);
6064 mpz_sub (s, s, e2->ref->u.ar.start[i]->value.integer);
6065 mpz_add_ui (s, s, 1);
6069 mpz_set (s, e2->ref->u.ar.start[i]->value.integer);
6072 if (mpz_cmp (e1->shape[i], s) != 0)
6074 gfc_error ("Source-expr at %L and allocate-object at %L must "
6075 "have the same shape", &e1->where, &e2->where);
6088 /* Resolve the expression in an ALLOCATE statement, doing the additional
6089 checks to see whether the expression is OK or not. The expression must
6090 have a trailing array reference that gives the size of the array. */
6093 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6095 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6096 symbol_attribute attr;
6097 gfc_ref *ref, *ref2;
6104 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6105 check_intent_in = 1;
6107 if (gfc_resolve_expr (e) == FAILURE)
6110 /* Make sure the expression is allocatable or a pointer. If it is
6111 pointer, the next-to-last reference must be a pointer. */
6115 sym = e->symtree->n.sym;
6117 /* Check whether ultimate component is abstract and CLASS. */
6120 if (e->expr_type != EXPR_VARIABLE)
6123 attr = gfc_expr_attr (e);
6124 pointer = attr.pointer;
6125 dimension = attr.dimension;
6129 if (sym->ts.type == BT_CLASS)
6131 allocatable = sym->ts.u.derived->components->attr.allocatable;
6132 pointer = sym->ts.u.derived->components->attr.pointer;
6133 dimension = sym->ts.u.derived->components->attr.dimension;
6134 is_abstract = sym->ts.u.derived->components->attr.abstract;
6138 allocatable = sym->attr.allocatable;
6139 pointer = sym->attr.pointer;
6140 dimension = sym->attr.dimension;
6143 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6146 check_intent_in = 0;
6151 if (ref->next != NULL)
6156 c = ref->u.c.component;
6157 if (c->ts.type == BT_CLASS)
6159 allocatable = c->ts.u.derived->components->attr.allocatable;
6160 pointer = c->ts.u.derived->components->attr.pointer;
6161 dimension = c->ts.u.derived->components->attr.dimension;
6162 is_abstract = c->ts.u.derived->components->attr.abstract;
6166 allocatable = c->attr.allocatable;
6167 pointer = c->attr.pointer;
6168 dimension = c->attr.dimension;
6169 is_abstract = c->attr.abstract;
6181 if (allocatable == 0 && pointer == 0)
6183 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6188 /* Some checks for the SOURCE tag. */
6191 /* Check F03:C631. */
6192 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6194 gfc_error ("Type of entity at %L is type incompatible with "
6195 "source-expr at %L", &e->where, &code->expr3->where);
6199 /* Check F03:C632 and restriction following Note 6.18. */
6200 if (code->expr3->rank > 0
6201 && conformable_arrays (code->expr3, e) == FAILURE)
6204 /* Check F03:C633. */
6205 if (code->expr3->ts.kind != e->ts.kind)
6207 gfc_error ("The allocate-object at %L and the source-expr at %L "
6208 "shall have the same kind type parameter",
6209 &e->where, &code->expr3->where);
6213 else if (is_abstract&& code->ext.alloc.ts.type == BT_UNKNOWN)
6215 gcc_assert (e->ts.type == BT_CLASS);
6216 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6217 "type-spec or SOURCE=", sym->name, &e->where);
6221 if (check_intent_in && sym->attr.intent == INTENT_IN)
6223 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6224 sym->name, &e->where);
6230 /* Add default initializer for those derived types that need them. */
6231 if (e->ts.type == BT_DERIVED
6232 && (init_e = gfc_default_initializer (&e->ts)))
6234 gfc_code *init_st = gfc_get_code ();
6235 init_st->loc = code->loc;
6236 init_st->op = EXEC_INIT_ASSIGN;
6237 init_st->expr1 = gfc_expr_to_initialize (e);
6238 init_st->expr2 = init_e;
6239 init_st->next = code->next;
6240 code->next = init_st;
6242 else if (e->ts.type == BT_CLASS
6243 && ((code->ext.alloc.ts.type == BT_UNKNOWN
6244 && (init_e = gfc_default_initializer (&e->ts.u.derived->components->ts)))
6245 || (code->ext.alloc.ts.type == BT_DERIVED
6246 && (init_e = gfc_default_initializer (&code->ext.alloc.ts)))))
6248 gfc_code *init_st = gfc_get_code ();
6249 init_st->loc = code->loc;
6250 init_st->op = EXEC_INIT_ASSIGN;
6251 init_st->expr1 = gfc_expr_to_initialize (e);
6252 init_st->expr2 = init_e;
6253 init_st->next = code->next;
6254 code->next = init_st;
6258 if (pointer || dimension == 0)
6261 /* Make sure the next-to-last reference node is an array specification. */
6263 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
6265 gfc_error ("Array specification required in ALLOCATE statement "
6266 "at %L", &e->where);
6270 /* Make sure that the array section reference makes sense in the
6271 context of an ALLOCATE specification. */
6275 for (i = 0; i < ar->dimen; i++)
6277 if (ref2->u.ar.type == AR_ELEMENT)
6280 switch (ar->dimen_type[i])
6286 if (ar->start[i] != NULL
6287 && ar->end[i] != NULL
6288 && ar->stride[i] == NULL)
6291 /* Fall Through... */
6295 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6302 for (a = code->ext.alloc.list; a; a = a->next)
6304 sym = a->expr->symtree->n.sym;
6306 /* TODO - check derived type components. */
6307 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6310 if ((ar->start[i] != NULL
6311 && gfc_find_sym_in_expr (sym, ar->start[i]))
6312 || (ar->end[i] != NULL
6313 && gfc_find_sym_in_expr (sym, ar->end[i])))
6315 gfc_error ("'%s' must not appear in the array specification at "
6316 "%L in the same ALLOCATE statement where it is "
6317 "itself allocated", sym->name, &ar->where);
6327 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6329 gfc_expr *stat, *errmsg, *pe, *qe;
6330 gfc_alloc *a, *p, *q;
6332 stat = code->expr1 ? code->expr1 : NULL;
6334 errmsg = code->expr2 ? code->expr2 : NULL;
6336 /* Check the stat variable. */
6339 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6340 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6341 stat->symtree->n.sym->name, &stat->where);
6343 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6344 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6347 if ((stat->ts.type != BT_INTEGER
6348 && !(stat->ref && (stat->ref->type == REF_ARRAY
6349 || stat->ref->type == REF_COMPONENT)))
6351 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6352 "variable", &stat->where);
6354 for (p = code->ext.alloc.list; p; p = p->next)
6355 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6356 gfc_error ("Stat-variable at %L shall not be %sd within "
6357 "the same %s statement", &stat->where, fcn, fcn);
6360 /* Check the errmsg variable. */
6364 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6367 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6368 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6369 errmsg->symtree->n.sym->name, &errmsg->where);
6371 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6372 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6375 if ((errmsg->ts.type != BT_CHARACTER
6377 && (errmsg->ref->type == REF_ARRAY
6378 || errmsg->ref->type == REF_COMPONENT)))
6379 || errmsg->rank > 0 )
6380 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6381 "variable", &errmsg->where);
6383 for (p = code->ext.alloc.list; p; p = p->next)
6384 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6385 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6386 "the same %s statement", &errmsg->where, fcn, fcn);
6389 /* Check that an allocate-object appears only once in the statement.
6390 FIXME: Checking derived types is disabled. */
6391 for (p = code->ext.alloc.list; p; p = p->next)
6394 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6395 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6397 for (q = p->next; q; q = q->next)
6400 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6401 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6402 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6403 gfc_error ("Allocate-object at %L also appears at %L",
6404 &pe->where, &qe->where);
6409 if (strcmp (fcn, "ALLOCATE") == 0)
6411 for (a = code->ext.alloc.list; a; a = a->next)
6412 resolve_allocate_expr (a->expr, code);
6416 for (a = code->ext.alloc.list; a; a = a->next)
6417 resolve_deallocate_expr (a->expr);
6422 /************ SELECT CASE resolution subroutines ************/
6424 /* Callback function for our mergesort variant. Determines interval
6425 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6426 op1 > op2. Assumes we're not dealing with the default case.
6427 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6428 There are nine situations to check. */
6431 compare_cases (const gfc_case *op1, const gfc_case *op2)
6435 if (op1->low == NULL) /* op1 = (:L) */
6437 /* op2 = (:N), so overlap. */
6439 /* op2 = (M:) or (M:N), L < M */
6440 if (op2->low != NULL
6441 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6444 else if (op1->high == NULL) /* op1 = (K:) */
6446 /* op2 = (M:), so overlap. */
6448 /* op2 = (:N) or (M:N), K > N */
6449 if (op2->high != NULL
6450 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6453 else /* op1 = (K:L) */
6455 if (op2->low == NULL) /* op2 = (:N), K > N */
6456 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6458 else if (op2->high == NULL) /* op2 = (M:), L < M */
6459 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6461 else /* op2 = (M:N) */
6465 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6468 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6477 /* Merge-sort a double linked case list, detecting overlap in the
6478 process. LIST is the head of the double linked case list before it
6479 is sorted. Returns the head of the sorted list if we don't see any
6480 overlap, or NULL otherwise. */
6483 check_case_overlap (gfc_case *list)
6485 gfc_case *p, *q, *e, *tail;
6486 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6488 /* If the passed list was empty, return immediately. */
6495 /* Loop unconditionally. The only exit from this loop is a return
6496 statement, when we've finished sorting the case list. */
6503 /* Count the number of merges we do in this pass. */
6506 /* Loop while there exists a merge to be done. */
6511 /* Count this merge. */
6514 /* Cut the list in two pieces by stepping INSIZE places
6515 forward in the list, starting from P. */
6518 for (i = 0; i < insize; i++)
6527 /* Now we have two lists. Merge them! */
6528 while (psize > 0 || (qsize > 0 && q != NULL))
6530 /* See from which the next case to merge comes from. */
6533 /* P is empty so the next case must come from Q. */
6538 else if (qsize == 0 || q == NULL)
6547 cmp = compare_cases (p, q);
6550 /* The whole case range for P is less than the
6558 /* The whole case range for Q is greater than
6559 the case range for P. */
6566 /* The cases overlap, or they are the same
6567 element in the list. Either way, we must
6568 issue an error and get the next case from P. */
6569 /* FIXME: Sort P and Q by line number. */
6570 gfc_error ("CASE label at %L overlaps with CASE "
6571 "label at %L", &p->where, &q->where);
6579 /* Add the next element to the merged list. */
6588 /* P has now stepped INSIZE places along, and so has Q. So
6589 they're the same. */
6594 /* If we have done only one merge or none at all, we've
6595 finished sorting the cases. */
6604 /* Otherwise repeat, merging lists twice the size. */
6610 /* Check to see if an expression is suitable for use in a CASE statement.
6611 Makes sure that all case expressions are scalar constants of the same
6612 type. Return FAILURE if anything is wrong. */
6615 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6617 if (e == NULL) return SUCCESS;
6619 if (e->ts.type != case_expr->ts.type)
6621 gfc_error ("Expression in CASE statement at %L must be of type %s",
6622 &e->where, gfc_basic_typename (case_expr->ts.type));
6626 /* C805 (R808) For a given case-construct, each case-value shall be of
6627 the same type as case-expr. For character type, length differences
6628 are allowed, but the kind type parameters shall be the same. */
6630 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6632 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6633 &e->where, case_expr->ts.kind);
6637 /* Convert the case value kind to that of case expression kind, if needed.
6638 FIXME: Should a warning be issued? */
6639 if (e->ts.kind != case_expr->ts.kind)
6640 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6644 gfc_error ("Expression in CASE statement at %L must be scalar",
6653 /* Given a completely parsed select statement, we:
6655 - Validate all expressions and code within the SELECT.
6656 - Make sure that the selection expression is not of the wrong type.
6657 - Make sure that no case ranges overlap.
6658 - Eliminate unreachable cases and unreachable code resulting from
6659 removing case labels.
6661 The standard does allow unreachable cases, e.g. CASE (5:3). But
6662 they are a hassle for code generation, and to prevent that, we just
6663 cut them out here. This is not necessary for overlapping cases
6664 because they are illegal and we never even try to generate code.
6666 We have the additional caveat that a SELECT construct could have
6667 been a computed GOTO in the source code. Fortunately we can fairly
6668 easily work around that here: The case_expr for a "real" SELECT CASE
6669 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6670 we have to do is make sure that the case_expr is a scalar integer
6674 resolve_select (gfc_code *code)
6677 gfc_expr *case_expr;
6678 gfc_case *cp, *default_case, *tail, *head;
6679 int seen_unreachable;
6685 if (code->expr1 == NULL)
6687 /* This was actually a computed GOTO statement. */
6688 case_expr = code->expr2;
6689 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6690 gfc_error ("Selection expression in computed GOTO statement "
6691 "at %L must be a scalar integer expression",
6694 /* Further checking is not necessary because this SELECT was built
6695 by the compiler, so it should always be OK. Just move the
6696 case_expr from expr2 to expr so that we can handle computed
6697 GOTOs as normal SELECTs from here on. */
6698 code->expr1 = code->expr2;
6703 case_expr = code->expr1;
6705 type = case_expr->ts.type;
6706 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6708 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6709 &case_expr->where, gfc_typename (&case_expr->ts));
6711 /* Punt. Going on here just produce more garbage error messages. */
6715 if (case_expr->rank != 0)
6717 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6718 "expression", &case_expr->where);
6724 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6725 of the SELECT CASE expression and its CASE values. Walk the lists
6726 of case values, and if we find a mismatch, promote case_expr to
6727 the appropriate kind. */
6729 if (type == BT_LOGICAL || type == BT_INTEGER)
6731 for (body = code->block; body; body = body->block)
6733 /* Walk the case label list. */
6734 for (cp = body->ext.case_list; cp; cp = cp->next)
6736 /* Intercept the DEFAULT case. It does not have a kind. */
6737 if (cp->low == NULL && cp->high == NULL)
6740 /* Unreachable case ranges are discarded, so ignore. */
6741 if (cp->low != NULL && cp->high != NULL
6742 && cp->low != cp->high
6743 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6746 /* FIXME: Should a warning be issued? */
6748 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6749 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6751 if (cp->high != NULL
6752 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6753 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6758 /* Assume there is no DEFAULT case. */
6759 default_case = NULL;
6764 for (body = code->block; body; body = body->block)
6766 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6768 seen_unreachable = 0;
6770 /* Walk the case label list, making sure that all case labels
6772 for (cp = body->ext.case_list; cp; cp = cp->next)
6774 /* Count the number of cases in the whole construct. */
6777 /* Intercept the DEFAULT case. */
6778 if (cp->low == NULL && cp->high == NULL)
6780 if (default_case != NULL)
6782 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6783 "by a second DEFAULT CASE at %L",
6784 &default_case->where, &cp->where);
6795 /* Deal with single value cases and case ranges. Errors are
6796 issued from the validation function. */
6797 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
6798 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
6804 if (type == BT_LOGICAL
6805 && ((cp->low == NULL || cp->high == NULL)
6806 || cp->low != cp->high))
6808 gfc_error ("Logical range in CASE statement at %L is not "
6809 "allowed", &cp->low->where);
6814 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
6817 value = cp->low->value.logical == 0 ? 2 : 1;
6818 if (value & seen_logical)
6820 gfc_error ("constant logical value in CASE statement "
6821 "is repeated at %L",
6826 seen_logical |= value;
6829 if (cp->low != NULL && cp->high != NULL
6830 && cp->low != cp->high
6831 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6833 if (gfc_option.warn_surprising)
6834 gfc_warning ("Range specification at %L can never "
6835 "be matched", &cp->where);
6837 cp->unreachable = 1;
6838 seen_unreachable = 1;
6842 /* If the case range can be matched, it can also overlap with
6843 other cases. To make sure it does not, we put it in a
6844 double linked list here. We sort that with a merge sort
6845 later on to detect any overlapping cases. */
6849 head->right = head->left = NULL;
6854 tail->right->left = tail;
6861 /* It there was a failure in the previous case label, give up
6862 for this case label list. Continue with the next block. */
6866 /* See if any case labels that are unreachable have been seen.
6867 If so, we eliminate them. This is a bit of a kludge because
6868 the case lists for a single case statement (label) is a
6869 single forward linked lists. */
6870 if (seen_unreachable)
6872 /* Advance until the first case in the list is reachable. */
6873 while (body->ext.case_list != NULL
6874 && body->ext.case_list->unreachable)
6876 gfc_case *n = body->ext.case_list;
6877 body->ext.case_list = body->ext.case_list->next;
6879 gfc_free_case_list (n);
6882 /* Strip all other unreachable cases. */
6883 if (body->ext.case_list)
6885 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6887 if (cp->next->unreachable)
6889 gfc_case *n = cp->next;
6890 cp->next = cp->next->next;
6892 gfc_free_case_list (n);
6899 /* See if there were overlapping cases. If the check returns NULL,
6900 there was overlap. In that case we don't do anything. If head
6901 is non-NULL, we prepend the DEFAULT case. The sorted list can
6902 then used during code generation for SELECT CASE constructs with
6903 a case expression of a CHARACTER type. */
6906 head = check_case_overlap (head);
6908 /* Prepend the default_case if it is there. */
6909 if (head != NULL && default_case)
6911 default_case->left = NULL;
6912 default_case->right = head;
6913 head->left = default_case;
6917 /* Eliminate dead blocks that may be the result if we've seen
6918 unreachable case labels for a block. */
6919 for (body = code; body && body->block; body = body->block)
6921 if (body->block->ext.case_list == NULL)
6923 /* Cut the unreachable block from the code chain. */
6924 gfc_code *c = body->block;
6925 body->block = c->block;
6927 /* Kill the dead block, but not the blocks below it. */
6929 gfc_free_statements (c);
6933 /* More than two cases is legal but insane for logical selects.
6934 Issue a warning for it. */
6935 if (gfc_option.warn_surprising && type == BT_LOGICAL
6937 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6942 /* Check if a derived type is extensible. */
6945 gfc_type_is_extensible (gfc_symbol *sym)
6947 return !(sym->attr.is_bind_c || sym->attr.sequence);
6951 /* Resolve a SELECT TYPE statement. */
6954 resolve_select_type (gfc_code *code)
6956 gfc_symbol *selector_type;
6957 gfc_code *body, *new_st, *if_st, *tail;
6958 gfc_code *class_is = NULL, *default_case = NULL;
6961 char name[GFC_MAX_SYMBOL_LEN];
6969 selector_type = code->expr2->ts.u.derived->components->ts.u.derived;
6971 selector_type = code->expr1->ts.u.derived->components->ts.u.derived;
6973 /* Loop over TYPE IS / CLASS IS cases. */
6974 for (body = code->block; body; body = body->block)
6976 c = body->ext.case_list;
6978 /* Check F03:C815. */
6979 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6980 && !gfc_type_is_extensible (c->ts.u.derived))
6982 gfc_error ("Derived type '%s' at %L must be extensible",
6983 c->ts.u.derived->name, &c->where);
6988 /* Check F03:C816. */
6989 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6990 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
6992 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
6993 c->ts.u.derived->name, &c->where, selector_type->name);
6998 /* Intercept the DEFAULT case. */
6999 if (c->ts.type == BT_UNKNOWN)
7001 /* Check F03:C818. */
7004 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7005 "by a second DEFAULT CASE at %L",
7006 &default_case->ext.case_list->where, &c->where);
7011 default_case = body;
7020 /* Insert assignment for selector variable. */
7021 new_st = gfc_get_code ();
7022 new_st->op = EXEC_ASSIGN;
7023 new_st->expr1 = gfc_copy_expr (code->expr1);
7024 new_st->expr2 = gfc_copy_expr (code->expr2);
7028 /* Put SELECT TYPE statement inside a BLOCK. */
7029 new_st = gfc_get_code ();
7030 new_st->op = code->op;
7031 new_st->expr1 = code->expr1;
7032 new_st->expr2 = code->expr2;
7033 new_st->block = code->block;
7037 ns->code->next = new_st;
7038 code->op = EXEC_BLOCK;
7039 code->expr1 = code->expr2 = NULL;
7044 /* Transform to EXEC_SELECT. */
7045 code->op = EXEC_SELECT;
7046 gfc_add_component_ref (code->expr1, "$vptr");
7047 gfc_add_component_ref (code->expr1, "$hash");
7049 /* Loop over TYPE IS / CLASS IS cases. */
7050 for (body = code->block; body; body = body->block)
7052 c = body->ext.case_list;
7054 if (c->ts.type == BT_DERIVED)
7055 c->low = c->high = gfc_int_expr (c->ts.u.derived->hash_value);
7056 else if (c->ts.type == BT_UNKNOWN)
7059 /* Assign temporary to selector. */
7060 if (c->ts.type == BT_CLASS)
7061 sprintf (name, "tmp$class$%s", c->ts.u.derived->name);
7063 sprintf (name, "tmp$type$%s", c->ts.u.derived->name);
7064 st = gfc_find_symtree (ns->sym_root, name);
7065 new_st = gfc_get_code ();
7066 new_st->expr1 = gfc_get_variable_expr (st);
7067 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
7068 if (c->ts.type == BT_DERIVED)
7070 new_st->op = EXEC_POINTER_ASSIGN;
7071 gfc_add_component_ref (new_st->expr2, "$data");
7074 new_st->op = EXEC_POINTER_ASSIGN;
7075 new_st->next = body->next;
7076 body->next = new_st;
7079 /* Take out CLASS IS cases for separate treatment. */
7081 while (body && body->block)
7083 if (body->block->ext.case_list->ts.type == BT_CLASS)
7085 /* Add to class_is list. */
7086 if (class_is == NULL)
7088 class_is = body->block;
7093 for (tail = class_is; tail->block; tail = tail->block) ;
7094 tail->block = body->block;
7097 /* Remove from EXEC_SELECT list. */
7098 body->block = body->block->block;
7111 /* Add a default case to hold the CLASS IS cases. */
7112 for (tail = code; tail->block; tail = tail->block) ;
7113 tail->block = gfc_get_code ();
7115 tail->op = EXEC_SELECT_TYPE;
7116 tail->ext.case_list = gfc_get_case ();
7117 tail->ext.case_list->ts.type = BT_UNKNOWN;
7119 default_case = tail;
7122 /* More than one CLASS IS block? */
7123 if (class_is->block)
7127 /* Sort CLASS IS blocks by extension level. */
7131 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7134 /* F03:C817 (check for doubles). */
7135 if ((*c1)->ext.case_list->ts.u.derived->hash_value
7136 == c2->ext.case_list->ts.u.derived->hash_value)
7138 gfc_error ("Double CLASS IS block in SELECT TYPE "
7139 "statement at %L", &c2->ext.case_list->where);
7142 if ((*c1)->ext.case_list->ts.u.derived->attr.extension
7143 < c2->ext.case_list->ts.u.derived->attr.extension)
7146 (*c1)->block = c2->block;
7156 /* Generate IF chain. */
7157 if_st = gfc_get_code ();
7158 if_st->op = EXEC_IF;
7160 for (body = class_is; body; body = body->block)
7162 new_st->block = gfc_get_code ();
7163 new_st = new_st->block;
7164 new_st->op = EXEC_IF;
7165 /* Set up IF condition: Call _gfortran_is_extension_of. */
7166 new_st->expr1 = gfc_get_expr ();
7167 new_st->expr1->expr_type = EXPR_FUNCTION;
7168 new_st->expr1->ts.type = BT_LOGICAL;
7169 new_st->expr1->ts.kind = 4;
7170 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
7171 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
7172 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
7173 /* Set up arguments. */
7174 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
7175 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
7176 gfc_add_component_ref (new_st->expr1->value.function.actual->expr, "$vptr");
7177 vtab = gfc_find_derived_vtab (body->ext.case_list->ts.u.derived);
7178 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
7179 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
7180 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
7181 new_st->next = body->next;
7183 if (default_case->next)
7185 new_st->block = gfc_get_code ();
7186 new_st = new_st->block;
7187 new_st->op = EXEC_IF;
7188 new_st->next = default_case->next;
7191 /* Replace CLASS DEFAULT code by the IF chain. */
7192 default_case->next = if_st;
7195 resolve_select (code);
7200 /* Resolve a transfer statement. This is making sure that:
7201 -- a derived type being transferred has only non-pointer components
7202 -- a derived type being transferred doesn't have private components, unless
7203 it's being transferred from the module where the type was defined
7204 -- we're not trying to transfer a whole assumed size array. */
7207 resolve_transfer (gfc_code *code)
7216 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
7219 sym = exp->symtree->n.sym;
7222 /* Go to actual component transferred. */
7223 for (ref = code->expr1->ref; ref; ref = ref->next)
7224 if (ref->type == REF_COMPONENT)
7225 ts = &ref->u.c.component->ts;
7227 if (ts->type == BT_DERIVED)
7229 /* Check that transferred derived type doesn't contain POINTER
7231 if (ts->u.derived->attr.pointer_comp)
7233 gfc_error ("Data transfer element at %L cannot have "
7234 "POINTER components", &code->loc);
7238 if (ts->u.derived->attr.alloc_comp)
7240 gfc_error ("Data transfer element at %L cannot have "
7241 "ALLOCATABLE components", &code->loc);
7245 if (derived_inaccessible (ts->u.derived))
7247 gfc_error ("Data transfer element at %L cannot have "
7248 "PRIVATE components",&code->loc);
7253 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7254 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7256 gfc_error ("Data transfer element at %L cannot be a full reference to "
7257 "an assumed-size array", &code->loc);
7263 /*********** Toplevel code resolution subroutines ***********/
7265 /* Find the set of labels that are reachable from this block. We also
7266 record the last statement in each block. */
7269 find_reachable_labels (gfc_code *block)
7276 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7278 /* Collect labels in this block. We don't keep those corresponding
7279 to END {IF|SELECT}, these are checked in resolve_branch by going
7280 up through the code_stack. */
7281 for (c = block; c; c = c->next)
7283 if (c->here && c->op != EXEC_END_BLOCK)
7284 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7287 /* Merge with labels from parent block. */
7290 gcc_assert (cs_base->prev->reachable_labels);
7291 bitmap_ior_into (cs_base->reachable_labels,
7292 cs_base->prev->reachable_labels);
7296 /* Given a branch to a label, see if the branch is conforming.
7297 The code node describes where the branch is located. */
7300 resolve_branch (gfc_st_label *label, gfc_code *code)
7307 /* Step one: is this a valid branching target? */
7309 if (label->defined == ST_LABEL_UNKNOWN)
7311 gfc_error ("Label %d referenced at %L is never defined", label->value,
7316 if (label->defined != ST_LABEL_TARGET)
7318 gfc_error ("Statement at %L is not a valid branch target statement "
7319 "for the branch statement at %L", &label->where, &code->loc);
7323 /* Step two: make sure this branch is not a branch to itself ;-) */
7325 if (code->here == label)
7327 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7331 /* Step three: See if the label is in the same block as the
7332 branching statement. The hard work has been done by setting up
7333 the bitmap reachable_labels. */
7335 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7338 /* Step four: If we haven't found the label in the bitmap, it may
7339 still be the label of the END of the enclosing block, in which
7340 case we find it by going up the code_stack. */
7342 for (stack = cs_base; stack; stack = stack->prev)
7343 if (stack->current->next && stack->current->next->here == label)
7348 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7352 /* The label is not in an enclosing block, so illegal. This was
7353 allowed in Fortran 66, so we allow it as extension. No
7354 further checks are necessary in this case. */
7355 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7356 "as the GOTO statement at %L", &label->where,
7362 /* Check whether EXPR1 has the same shape as EXPR2. */
7365 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7367 mpz_t shape[GFC_MAX_DIMENSIONS];
7368 mpz_t shape2[GFC_MAX_DIMENSIONS];
7369 gfc_try result = FAILURE;
7372 /* Compare the rank. */
7373 if (expr1->rank != expr2->rank)
7376 /* Compare the size of each dimension. */
7377 for (i=0; i<expr1->rank; i++)
7379 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7382 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7385 if (mpz_cmp (shape[i], shape2[i]))
7389 /* When either of the two expression is an assumed size array, we
7390 ignore the comparison of dimension sizes. */
7395 for (i--; i >= 0; i--)
7397 mpz_clear (shape[i]);
7398 mpz_clear (shape2[i]);
7404 /* Check whether a WHERE assignment target or a WHERE mask expression
7405 has the same shape as the outmost WHERE mask expression. */
7408 resolve_where (gfc_code *code, gfc_expr *mask)
7414 cblock = code->block;
7416 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7417 In case of nested WHERE, only the outmost one is stored. */
7418 if (mask == NULL) /* outmost WHERE */
7420 else /* inner WHERE */
7427 /* Check if the mask-expr has a consistent shape with the
7428 outmost WHERE mask-expr. */
7429 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7430 gfc_error ("WHERE mask at %L has inconsistent shape",
7431 &cblock->expr1->where);
7434 /* the assignment statement of a WHERE statement, or the first
7435 statement in where-body-construct of a WHERE construct */
7436 cnext = cblock->next;
7441 /* WHERE assignment statement */
7444 /* Check shape consistent for WHERE assignment target. */
7445 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7446 gfc_error ("WHERE assignment target at %L has "
7447 "inconsistent shape", &cnext->expr1->where);
7451 case EXEC_ASSIGN_CALL:
7452 resolve_call (cnext);
7453 if (!cnext->resolved_sym->attr.elemental)
7454 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7455 &cnext->ext.actual->expr->where);
7458 /* WHERE or WHERE construct is part of a where-body-construct */
7460 resolve_where (cnext, e);
7464 gfc_error ("Unsupported statement inside WHERE at %L",
7467 /* the next statement within the same where-body-construct */
7468 cnext = cnext->next;
7470 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7471 cblock = cblock->block;
7476 /* Resolve assignment in FORALL construct.
7477 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7478 FORALL index variables. */
7481 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7485 for (n = 0; n < nvar; n++)
7487 gfc_symbol *forall_index;
7489 forall_index = var_expr[n]->symtree->n.sym;
7491 /* Check whether the assignment target is one of the FORALL index
7493 if ((code->expr1->expr_type == EXPR_VARIABLE)
7494 && (code->expr1->symtree->n.sym == forall_index))
7495 gfc_error ("Assignment to a FORALL index variable at %L",
7496 &code->expr1->where);
7499 /* If one of the FORALL index variables doesn't appear in the
7500 assignment variable, then there could be a many-to-one
7501 assignment. Emit a warning rather than an error because the
7502 mask could be resolving this problem. */
7503 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7504 gfc_warning ("The FORALL with index '%s' is not used on the "
7505 "left side of the assignment at %L and so might "
7506 "cause multiple assignment to this object",
7507 var_expr[n]->symtree->name, &code->expr1->where);
7513 /* Resolve WHERE statement in FORALL construct. */
7516 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7517 gfc_expr **var_expr)
7522 cblock = code->block;
7525 /* the assignment statement of a WHERE statement, or the first
7526 statement in where-body-construct of a WHERE construct */
7527 cnext = cblock->next;
7532 /* WHERE assignment statement */
7534 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7537 /* WHERE operator assignment statement */
7538 case EXEC_ASSIGN_CALL:
7539 resolve_call (cnext);
7540 if (!cnext->resolved_sym->attr.elemental)
7541 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7542 &cnext->ext.actual->expr->where);
7545 /* WHERE or WHERE construct is part of a where-body-construct */
7547 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7551 gfc_error ("Unsupported statement inside WHERE at %L",
7554 /* the next statement within the same where-body-construct */
7555 cnext = cnext->next;
7557 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7558 cblock = cblock->block;
7563 /* Traverse the FORALL body to check whether the following errors exist:
7564 1. For assignment, check if a many-to-one assignment happens.
7565 2. For WHERE statement, check the WHERE body to see if there is any
7566 many-to-one assignment. */
7569 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7573 c = code->block->next;
7579 case EXEC_POINTER_ASSIGN:
7580 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7583 case EXEC_ASSIGN_CALL:
7587 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7588 there is no need to handle it here. */
7592 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7597 /* The next statement in the FORALL body. */
7603 /* Counts the number of iterators needed inside a forall construct, including
7604 nested forall constructs. This is used to allocate the needed memory
7605 in gfc_resolve_forall. */
7608 gfc_count_forall_iterators (gfc_code *code)
7610 int max_iters, sub_iters, current_iters;
7611 gfc_forall_iterator *fa;
7613 gcc_assert(code->op == EXEC_FORALL);
7617 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7620 code = code->block->next;
7624 if (code->op == EXEC_FORALL)
7626 sub_iters = gfc_count_forall_iterators (code);
7627 if (sub_iters > max_iters)
7628 max_iters = sub_iters;
7633 return current_iters + max_iters;
7637 /* Given a FORALL construct, first resolve the FORALL iterator, then call
7638 gfc_resolve_forall_body to resolve the FORALL body. */
7641 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
7643 static gfc_expr **var_expr;
7644 static int total_var = 0;
7645 static int nvar = 0;
7647 gfc_forall_iterator *fa;
7652 /* Start to resolve a FORALL construct */
7653 if (forall_save == 0)
7655 /* Count the total number of FORALL index in the nested FORALL
7656 construct in order to allocate the VAR_EXPR with proper size. */
7657 total_var = gfc_count_forall_iterators (code);
7659 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
7660 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
7663 /* The information about FORALL iterator, including FORALL index start, end
7664 and stride. The FORALL index can not appear in start, end or stride. */
7665 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7667 /* Check if any outer FORALL index name is the same as the current
7669 for (i = 0; i < nvar; i++)
7671 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
7673 gfc_error ("An outer FORALL construct already has an index "
7674 "with this name %L", &fa->var->where);
7678 /* Record the current FORALL index. */
7679 var_expr[nvar] = gfc_copy_expr (fa->var);
7683 /* No memory leak. */
7684 gcc_assert (nvar <= total_var);
7687 /* Resolve the FORALL body. */
7688 gfc_resolve_forall_body (code, nvar, var_expr);
7690 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
7691 gfc_resolve_blocks (code->block, ns);
7695 /* Free only the VAR_EXPRs allocated in this frame. */
7696 for (i = nvar; i < tmp; i++)
7697 gfc_free_expr (var_expr[i]);
7701 /* We are in the outermost FORALL construct. */
7702 gcc_assert (forall_save == 0);
7704 /* VAR_EXPR is not needed any more. */
7705 gfc_free (var_expr);
7711 /* Resolve a BLOCK construct statement. */
7714 resolve_block_construct (gfc_code* code)
7716 /* Eventually, we may want to do some checks here or handle special stuff.
7717 But so far the only thing we can do is resolving the local namespace. */
7719 gfc_resolve (code->ext.ns);
7723 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
7726 static void resolve_code (gfc_code *, gfc_namespace *);
7729 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
7733 for (; b; b = b->block)
7735 t = gfc_resolve_expr (b->expr1);
7736 if (gfc_resolve_expr (b->expr2) == FAILURE)
7742 if (t == SUCCESS && b->expr1 != NULL
7743 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
7744 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7751 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
7752 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
7757 resolve_branch (b->label1, b);
7761 resolve_block_construct (b);
7765 case EXEC_SELECT_TYPE:
7775 case EXEC_OMP_ATOMIC:
7776 case EXEC_OMP_CRITICAL:
7778 case EXEC_OMP_MASTER:
7779 case EXEC_OMP_ORDERED:
7780 case EXEC_OMP_PARALLEL:
7781 case EXEC_OMP_PARALLEL_DO:
7782 case EXEC_OMP_PARALLEL_SECTIONS:
7783 case EXEC_OMP_PARALLEL_WORKSHARE:
7784 case EXEC_OMP_SECTIONS:
7785 case EXEC_OMP_SINGLE:
7787 case EXEC_OMP_TASKWAIT:
7788 case EXEC_OMP_WORKSHARE:
7792 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
7795 resolve_code (b->next, ns);
7800 /* Does everything to resolve an ordinary assignment. Returns true
7801 if this is an interface assignment. */
7803 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
7813 if (gfc_extend_assign (code, ns) == SUCCESS)
7817 if (code->op == EXEC_ASSIGN_CALL)
7819 lhs = code->ext.actual->expr;
7820 rhsptr = &code->ext.actual->next->expr;
7824 gfc_actual_arglist* args;
7825 gfc_typebound_proc* tbp;
7827 gcc_assert (code->op == EXEC_COMPCALL);
7829 args = code->expr1->value.compcall.actual;
7831 rhsptr = &args->next->expr;
7833 tbp = code->expr1->value.compcall.tbp;
7834 gcc_assert (!tbp->is_generic);
7837 /* Make a temporary rhs when there is a default initializer
7838 and rhs is the same symbol as the lhs. */
7839 if ((*rhsptr)->expr_type == EXPR_VARIABLE
7840 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
7841 && has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
7842 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
7843 *rhsptr = gfc_get_parentheses (*rhsptr);
7852 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
7853 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
7854 &code->loc) == FAILURE)
7857 /* Handle the case of a BOZ literal on the RHS. */
7858 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
7861 if (gfc_option.warn_surprising)
7862 gfc_warning ("BOZ literal at %L is bitwise transferred "
7863 "non-integer symbol '%s'", &code->loc,
7864 lhs->symtree->n.sym->name);
7866 if (!gfc_convert_boz (rhs, &lhs->ts))
7868 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
7870 if (rc == ARITH_UNDERFLOW)
7871 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
7872 ". This check can be disabled with the option "
7873 "-fno-range-check", &rhs->where);
7874 else if (rc == ARITH_OVERFLOW)
7875 gfc_error ("Arithmetic overflow 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_NAN)
7879 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
7880 ". This check can be disabled with the option "
7881 "-fno-range-check", &rhs->where);
7887 if (lhs->ts.type == BT_CHARACTER
7888 && gfc_option.warn_character_truncation)
7890 if (lhs->ts.u.cl != NULL
7891 && lhs->ts.u.cl->length != NULL
7892 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7893 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
7895 if (rhs->expr_type == EXPR_CONSTANT)
7896 rlen = rhs->value.character.length;
7898 else if (rhs->ts.u.cl != NULL
7899 && rhs->ts.u.cl->length != NULL
7900 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7901 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
7903 if (rlen && llen && rlen > llen)
7904 gfc_warning_now ("CHARACTER expression will be truncated "
7905 "in assignment (%d/%d) at %L",
7906 llen, rlen, &code->loc);
7909 /* Ensure that a vector index expression for the lvalue is evaluated
7910 to a temporary if the lvalue symbol is referenced in it. */
7913 for (ref = lhs->ref; ref; ref= ref->next)
7914 if (ref->type == REF_ARRAY)
7916 for (n = 0; n < ref->u.ar.dimen; n++)
7917 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
7918 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
7919 ref->u.ar.start[n]))
7921 = gfc_get_parentheses (ref->u.ar.start[n]);
7925 if (gfc_pure (NULL))
7927 if (gfc_impure_variable (lhs->symtree->n.sym))
7929 gfc_error ("Cannot assign to variable '%s' in PURE "
7931 lhs->symtree->n.sym->name,
7936 if (lhs->ts.type == BT_DERIVED
7937 && lhs->expr_type == EXPR_VARIABLE
7938 && lhs->ts.u.derived->attr.pointer_comp
7939 && gfc_impure_variable (rhs->symtree->n.sym))
7941 gfc_error ("The impure variable at %L is assigned to "
7942 "a derived type variable with a POINTER "
7943 "component in a PURE procedure (12.6)",
7950 if (lhs->ts.type == BT_CLASS)
7952 gfc_error ("Variable must not be polymorphic in assignment at %L",
7957 gfc_check_assign (lhs, rhs, 1);
7962 /* Given a block of code, recursively resolve everything pointed to by this
7966 resolve_code (gfc_code *code, gfc_namespace *ns)
7968 int omp_workshare_save;
7973 frame.prev = cs_base;
7977 find_reachable_labels (code);
7979 for (; code; code = code->next)
7981 frame.current = code;
7982 forall_save = forall_flag;
7984 if (code->op == EXEC_FORALL)
7987 gfc_resolve_forall (code, ns, forall_save);
7990 else if (code->block)
7992 omp_workshare_save = -1;
7995 case EXEC_OMP_PARALLEL_WORKSHARE:
7996 omp_workshare_save = omp_workshare_flag;
7997 omp_workshare_flag = 1;
7998 gfc_resolve_omp_parallel_blocks (code, ns);
8000 case EXEC_OMP_PARALLEL:
8001 case EXEC_OMP_PARALLEL_DO:
8002 case EXEC_OMP_PARALLEL_SECTIONS:
8004 omp_workshare_save = omp_workshare_flag;
8005 omp_workshare_flag = 0;
8006 gfc_resolve_omp_parallel_blocks (code, ns);
8009 gfc_resolve_omp_do_blocks (code, ns);
8011 case EXEC_OMP_WORKSHARE:
8012 omp_workshare_save = omp_workshare_flag;
8013 omp_workshare_flag = 1;
8016 gfc_resolve_blocks (code->block, ns);
8020 if (omp_workshare_save != -1)
8021 omp_workshare_flag = omp_workshare_save;
8025 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
8026 t = gfc_resolve_expr (code->expr1);
8027 forall_flag = forall_save;
8029 if (gfc_resolve_expr (code->expr2) == FAILURE)
8032 if (code->op == EXEC_ALLOCATE
8033 && gfc_resolve_expr (code->expr3) == FAILURE)
8039 case EXEC_END_BLOCK:
8046 case EXEC_ASSIGN_CALL:
8050 /* Keep track of which entry we are up to. */
8051 current_entry_id = code->ext.entry->id;
8055 resolve_where (code, NULL);
8059 if (code->expr1 != NULL)
8061 if (code->expr1->ts.type != BT_INTEGER)
8062 gfc_error ("ASSIGNED GOTO statement at %L requires an "
8063 "INTEGER variable", &code->expr1->where);
8064 else if (code->expr1->symtree->n.sym->attr.assign != 1)
8065 gfc_error ("Variable '%s' has not been assigned a target "
8066 "label at %L", code->expr1->symtree->n.sym->name,
8067 &code->expr1->where);
8070 resolve_branch (code->label1, code);
8074 if (code->expr1 != NULL
8075 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
8076 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
8077 "INTEGER return specifier", &code->expr1->where);
8080 case EXEC_INIT_ASSIGN:
8081 case EXEC_END_PROCEDURE:
8088 if (resolve_ordinary_assign (code, ns))
8090 if (code->op == EXEC_COMPCALL)
8097 case EXEC_LABEL_ASSIGN:
8098 if (code->label1->defined == ST_LABEL_UNKNOWN)
8099 gfc_error ("Label %d referenced at %L is never defined",
8100 code->label1->value, &code->label1->where);
8102 && (code->expr1->expr_type != EXPR_VARIABLE
8103 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
8104 || code->expr1->symtree->n.sym->ts.kind
8105 != gfc_default_integer_kind
8106 || code->expr1->symtree->n.sym->as != NULL))
8107 gfc_error ("ASSIGN statement at %L requires a scalar "
8108 "default INTEGER variable", &code->expr1->where);
8111 case EXEC_POINTER_ASSIGN:
8115 gfc_check_pointer_assign (code->expr1, code->expr2);
8118 case EXEC_ARITHMETIC_IF:
8120 && code->expr1->ts.type != BT_INTEGER
8121 && code->expr1->ts.type != BT_REAL)
8122 gfc_error ("Arithmetic IF statement at %L requires a numeric "
8123 "expression", &code->expr1->where);
8125 resolve_branch (code->label1, code);
8126 resolve_branch (code->label2, code);
8127 resolve_branch (code->label3, code);
8131 if (t == SUCCESS && code->expr1 != NULL
8132 && (code->expr1->ts.type != BT_LOGICAL
8133 || code->expr1->rank != 0))
8134 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8135 &code->expr1->where);
8140 resolve_call (code);
8145 if (code->expr1->symtree
8146 && code->expr1->symtree->n.sym->ts.type == BT_CLASS)
8147 resolve_class_typebound_call (code);
8149 resolve_typebound_call (code);
8153 resolve_ppc_call (code);
8157 /* Select is complicated. Also, a SELECT construct could be
8158 a transformed computed GOTO. */
8159 resolve_select (code);
8162 case EXEC_SELECT_TYPE:
8163 resolve_select_type (code);
8167 gfc_resolve (code->ext.ns);
8171 if (code->ext.iterator != NULL)
8173 gfc_iterator *iter = code->ext.iterator;
8174 if (gfc_resolve_iterator (iter, true) != FAILURE)
8175 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
8180 if (code->expr1 == NULL)
8181 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
8183 && (code->expr1->rank != 0
8184 || code->expr1->ts.type != BT_LOGICAL))
8185 gfc_error ("Exit condition of DO WHILE loop at %L must be "
8186 "a scalar LOGICAL expression", &code->expr1->where);
8191 resolve_allocate_deallocate (code, "ALLOCATE");
8195 case EXEC_DEALLOCATE:
8197 resolve_allocate_deallocate (code, "DEALLOCATE");
8202 if (gfc_resolve_open (code->ext.open) == FAILURE)
8205 resolve_branch (code->ext.open->err, code);
8209 if (gfc_resolve_close (code->ext.close) == FAILURE)
8212 resolve_branch (code->ext.close->err, code);
8215 case EXEC_BACKSPACE:
8219 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8222 resolve_branch (code->ext.filepos->err, code);
8226 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8229 resolve_branch (code->ext.inquire->err, code);
8233 gcc_assert (code->ext.inquire != NULL);
8234 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8237 resolve_branch (code->ext.inquire->err, code);
8241 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8244 resolve_branch (code->ext.wait->err, code);
8245 resolve_branch (code->ext.wait->end, code);
8246 resolve_branch (code->ext.wait->eor, code);
8251 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8254 resolve_branch (code->ext.dt->err, code);
8255 resolve_branch (code->ext.dt->end, code);
8256 resolve_branch (code->ext.dt->eor, code);
8260 resolve_transfer (code);
8264 resolve_forall_iterators (code->ext.forall_iterator);
8266 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8267 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8268 "expression", &code->expr1->where);
8271 case EXEC_OMP_ATOMIC:
8272 case EXEC_OMP_BARRIER:
8273 case EXEC_OMP_CRITICAL:
8274 case EXEC_OMP_FLUSH:
8276 case EXEC_OMP_MASTER:
8277 case EXEC_OMP_ORDERED:
8278 case EXEC_OMP_SECTIONS:
8279 case EXEC_OMP_SINGLE:
8280 case EXEC_OMP_TASKWAIT:
8281 case EXEC_OMP_WORKSHARE:
8282 gfc_resolve_omp_directive (code, ns);
8285 case EXEC_OMP_PARALLEL:
8286 case EXEC_OMP_PARALLEL_DO:
8287 case EXEC_OMP_PARALLEL_SECTIONS:
8288 case EXEC_OMP_PARALLEL_WORKSHARE:
8290 omp_workshare_save = omp_workshare_flag;
8291 omp_workshare_flag = 0;
8292 gfc_resolve_omp_directive (code, ns);
8293 omp_workshare_flag = omp_workshare_save;
8297 gfc_internal_error ("resolve_code(): Bad statement code");
8301 cs_base = frame.prev;
8305 /* Resolve initial values and make sure they are compatible with
8309 resolve_values (gfc_symbol *sym)
8311 if (sym->value == NULL)
8314 if (gfc_resolve_expr (sym->value) == FAILURE)
8317 gfc_check_assign_symbol (sym, sym->value);
8321 /* Verify the binding labels for common blocks that are BIND(C). The label
8322 for a BIND(C) common block must be identical in all scoping units in which
8323 the common block is declared. Further, the binding label can not collide
8324 with any other global entity in the program. */
8327 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8329 if (comm_block_tree->n.common->is_bind_c == 1)
8331 gfc_gsymbol *binding_label_gsym;
8332 gfc_gsymbol *comm_name_gsym;
8334 /* See if a global symbol exists by the common block's name. It may
8335 be NULL if the common block is use-associated. */
8336 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8337 comm_block_tree->n.common->name);
8338 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8339 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8340 "with the global entity '%s' at %L",
8341 comm_block_tree->n.common->binding_label,
8342 comm_block_tree->n.common->name,
8343 &(comm_block_tree->n.common->where),
8344 comm_name_gsym->name, &(comm_name_gsym->where));
8345 else if (comm_name_gsym != NULL
8346 && strcmp (comm_name_gsym->name,
8347 comm_block_tree->n.common->name) == 0)
8349 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8351 if (comm_name_gsym->binding_label == NULL)
8352 /* No binding label for common block stored yet; save this one. */
8353 comm_name_gsym->binding_label =
8354 comm_block_tree->n.common->binding_label;
8356 if (strcmp (comm_name_gsym->binding_label,
8357 comm_block_tree->n.common->binding_label) != 0)
8359 /* Common block names match but binding labels do not. */
8360 gfc_error ("Binding label '%s' for common block '%s' at %L "
8361 "does not match the binding label '%s' for common "
8363 comm_block_tree->n.common->binding_label,
8364 comm_block_tree->n.common->name,
8365 &(comm_block_tree->n.common->where),
8366 comm_name_gsym->binding_label,
8367 comm_name_gsym->name,
8368 &(comm_name_gsym->where));
8373 /* There is no binding label (NAME="") so we have nothing further to
8374 check and nothing to add as a global symbol for the label. */
8375 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8378 binding_label_gsym =
8379 gfc_find_gsymbol (gfc_gsym_root,
8380 comm_block_tree->n.common->binding_label);
8381 if (binding_label_gsym == NULL)
8383 /* Need to make a global symbol for the binding label to prevent
8384 it from colliding with another. */
8385 binding_label_gsym =
8386 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8387 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8388 binding_label_gsym->type = GSYM_COMMON;
8392 /* If comm_name_gsym is NULL, the name common block is use
8393 associated and the name could be colliding. */
8394 if (binding_label_gsym->type != GSYM_COMMON)
8395 gfc_error ("Binding label '%s' for common block '%s' at %L "
8396 "collides with the global entity '%s' at %L",
8397 comm_block_tree->n.common->binding_label,
8398 comm_block_tree->n.common->name,
8399 &(comm_block_tree->n.common->where),
8400 binding_label_gsym->name,
8401 &(binding_label_gsym->where));
8402 else if (comm_name_gsym != NULL
8403 && (strcmp (binding_label_gsym->name,
8404 comm_name_gsym->binding_label) != 0)
8405 && (strcmp (binding_label_gsym->sym_name,
8406 comm_name_gsym->name) != 0))
8407 gfc_error ("Binding label '%s' for common block '%s' at %L "
8408 "collides with global entity '%s' at %L",
8409 binding_label_gsym->name, binding_label_gsym->sym_name,
8410 &(comm_block_tree->n.common->where),
8411 comm_name_gsym->name, &(comm_name_gsym->where));
8419 /* Verify any BIND(C) derived types in the namespace so we can report errors
8420 for them once, rather than for each variable declared of that type. */
8423 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8425 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8426 && derived_sym->attr.is_bind_c == 1)
8427 verify_bind_c_derived_type (derived_sym);
8433 /* Verify that any binding labels used in a given namespace do not collide
8434 with the names or binding labels of any global symbols. */
8437 gfc_verify_binding_labels (gfc_symbol *sym)
8441 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8442 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8444 gfc_gsymbol *bind_c_sym;
8446 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8447 if (bind_c_sym != NULL
8448 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8450 if (sym->attr.if_source == IFSRC_DECL
8451 && (bind_c_sym->type != GSYM_SUBROUTINE
8452 && bind_c_sym->type != GSYM_FUNCTION)
8453 && ((sym->attr.contained == 1
8454 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8455 || (sym->attr.use_assoc == 1
8456 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8458 /* Make sure global procedures don't collide with anything. */
8459 gfc_error ("Binding label '%s' at %L collides with the global "
8460 "entity '%s' at %L", sym->binding_label,
8461 &(sym->declared_at), bind_c_sym->name,
8462 &(bind_c_sym->where));
8465 else if (sym->attr.contained == 0
8466 && (sym->attr.if_source == IFSRC_IFBODY
8467 && sym->attr.flavor == FL_PROCEDURE)
8468 && (bind_c_sym->sym_name != NULL
8469 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8471 /* Make sure procedures in interface bodies don't collide. */
8472 gfc_error ("Binding label '%s' in interface body at %L collides "
8473 "with the global entity '%s' at %L",
8475 &(sym->declared_at), bind_c_sym->name,
8476 &(bind_c_sym->where));
8479 else if (sym->attr.contained == 0
8480 && sym->attr.if_source == IFSRC_UNKNOWN)
8481 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8482 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8483 || sym->attr.use_assoc == 0)
8485 gfc_error ("Binding label '%s' at %L collides with global "
8486 "entity '%s' at %L", sym->binding_label,
8487 &(sym->declared_at), bind_c_sym->name,
8488 &(bind_c_sym->where));
8493 /* Clear the binding label to prevent checking multiple times. */
8494 sym->binding_label[0] = '\0';
8496 else if (bind_c_sym == NULL)
8498 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8499 bind_c_sym->where = sym->declared_at;
8500 bind_c_sym->sym_name = sym->name;
8502 if (sym->attr.use_assoc == 1)
8503 bind_c_sym->mod_name = sym->module;
8505 if (sym->ns->proc_name != NULL)
8506 bind_c_sym->mod_name = sym->ns->proc_name->name;
8508 if (sym->attr.contained == 0)
8510 if (sym->attr.subroutine)
8511 bind_c_sym->type = GSYM_SUBROUTINE;
8512 else if (sym->attr.function)
8513 bind_c_sym->type = GSYM_FUNCTION;
8521 /* Resolve an index expression. */
8524 resolve_index_expr (gfc_expr *e)
8526 if (gfc_resolve_expr (e) == FAILURE)
8529 if (gfc_simplify_expr (e, 0) == FAILURE)
8532 if (gfc_specification_expr (e) == FAILURE)
8538 /* Resolve a charlen structure. */
8541 resolve_charlen (gfc_charlen *cl)
8550 specification_expr = 1;
8552 if (resolve_index_expr (cl->length) == FAILURE)
8554 specification_expr = 0;
8558 /* "If the character length parameter value evaluates to a negative
8559 value, the length of character entities declared is zero." */
8560 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8562 if (gfc_option.warn_surprising)
8563 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
8564 " the length has been set to zero",
8565 &cl->length->where, i);
8566 gfc_replace_expr (cl->length, gfc_int_expr (0));
8569 /* Check that the character length is not too large. */
8570 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8571 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8572 && cl->length->ts.type == BT_INTEGER
8573 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8575 gfc_error ("String length at %L is too large", &cl->length->where);
8583 /* Test for non-constant shape arrays. */
8586 is_non_constant_shape_array (gfc_symbol *sym)
8592 not_constant = false;
8593 if (sym->as != NULL)
8595 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
8596 has not been simplified; parameter array references. Do the
8597 simplification now. */
8598 for (i = 0; i < sym->as->rank; i++)
8600 e = sym->as->lower[i];
8601 if (e && (resolve_index_expr (e) == FAILURE
8602 || !gfc_is_constant_expr (e)))
8603 not_constant = true;
8605 e = sym->as->upper[i];
8606 if (e && (resolve_index_expr (e) == FAILURE
8607 || !gfc_is_constant_expr (e)))
8608 not_constant = true;
8611 return not_constant;
8614 /* Given a symbol and an initialization expression, add code to initialize
8615 the symbol to the function entry. */
8617 build_init_assign (gfc_symbol *sym, gfc_expr *init)
8621 gfc_namespace *ns = sym->ns;
8623 /* Search for the function namespace if this is a contained
8624 function without an explicit result. */
8625 if (sym->attr.function && sym == sym->result
8626 && sym->name != sym->ns->proc_name->name)
8629 for (;ns; ns = ns->sibling)
8630 if (strcmp (ns->proc_name->name, sym->name) == 0)
8636 gfc_free_expr (init);
8640 /* Build an l-value expression for the result. */
8641 lval = gfc_lval_expr_from_sym (sym);
8643 /* Add the code at scope entry. */
8644 init_st = gfc_get_code ();
8645 init_st->next = ns->code;
8648 /* Assign the default initializer to the l-value. */
8649 init_st->loc = sym->declared_at;
8650 init_st->op = EXEC_INIT_ASSIGN;
8651 init_st->expr1 = lval;
8652 init_st->expr2 = init;
8655 /* Assign the default initializer to a derived type variable or result. */
8658 apply_default_init (gfc_symbol *sym)
8660 gfc_expr *init = NULL;
8662 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8665 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
8666 init = gfc_default_initializer (&sym->ts);
8671 build_init_assign (sym, init);
8674 /* Build an initializer for a local integer, real, complex, logical, or
8675 character variable, based on the command line flags finit-local-zero,
8676 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
8677 null if the symbol should not have a default initialization. */
8679 build_default_init_expr (gfc_symbol *sym)
8682 gfc_expr *init_expr;
8685 /* These symbols should never have a default initialization. */
8686 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
8687 || sym->attr.external
8689 || sym->attr.pointer
8690 || sym->attr.in_equivalence
8691 || sym->attr.in_common
8694 || sym->attr.cray_pointee
8695 || sym->attr.cray_pointer)
8698 /* Now we'll try to build an initializer expression. */
8699 init_expr = gfc_get_expr ();
8700 init_expr->expr_type = EXPR_CONSTANT;
8701 init_expr->ts.type = sym->ts.type;
8702 init_expr->ts.kind = sym->ts.kind;
8703 init_expr->where = sym->declared_at;
8705 /* We will only initialize integers, reals, complex, logicals, and
8706 characters, and only if the corresponding command-line flags
8707 were set. Otherwise, we free init_expr and return null. */
8708 switch (sym->ts.type)
8711 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
8712 mpz_init_set_si (init_expr->value.integer,
8713 gfc_option.flag_init_integer_value);
8716 gfc_free_expr (init_expr);
8722 mpfr_init (init_expr->value.real);
8723 switch (gfc_option.flag_init_real)
8725 case GFC_INIT_REAL_SNAN:
8726 init_expr->is_snan = 1;
8728 case GFC_INIT_REAL_NAN:
8729 mpfr_set_nan (init_expr->value.real);
8732 case GFC_INIT_REAL_INF:
8733 mpfr_set_inf (init_expr->value.real, 1);
8736 case GFC_INIT_REAL_NEG_INF:
8737 mpfr_set_inf (init_expr->value.real, -1);
8740 case GFC_INIT_REAL_ZERO:
8741 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
8745 gfc_free_expr (init_expr);
8752 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
8753 switch (gfc_option.flag_init_real)
8755 case GFC_INIT_REAL_SNAN:
8756 init_expr->is_snan = 1;
8758 case GFC_INIT_REAL_NAN:
8759 mpfr_set_nan (mpc_realref (init_expr->value.complex));
8760 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
8763 case GFC_INIT_REAL_INF:
8764 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
8765 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
8768 case GFC_INIT_REAL_NEG_INF:
8769 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
8770 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
8773 case GFC_INIT_REAL_ZERO:
8774 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
8778 gfc_free_expr (init_expr);
8785 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
8786 init_expr->value.logical = 0;
8787 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
8788 init_expr->value.logical = 1;
8791 gfc_free_expr (init_expr);
8797 /* For characters, the length must be constant in order to
8798 create a default initializer. */
8799 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
8800 && sym->ts.u.cl->length
8801 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8803 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
8804 init_expr->value.character.length = char_len;
8805 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
8806 for (i = 0; i < char_len; i++)
8807 init_expr->value.character.string[i]
8808 = (unsigned char) gfc_option.flag_init_character_value;
8812 gfc_free_expr (init_expr);
8818 gfc_free_expr (init_expr);
8824 /* Add an initialization expression to a local variable. */
8826 apply_default_init_local (gfc_symbol *sym)
8828 gfc_expr *init = NULL;
8830 /* The symbol should be a variable or a function return value. */
8831 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8832 || (sym->attr.function && sym->result != sym))
8835 /* Try to build the initializer expression. If we can't initialize
8836 this symbol, then init will be NULL. */
8837 init = build_default_init_expr (sym);
8841 /* For saved variables, we don't want to add an initializer at
8842 function entry, so we just add a static initializer. */
8843 if (sym->attr.save || sym->ns->save_all
8844 || gfc_option.flag_max_stack_var_size == 0)
8846 /* Don't clobber an existing initializer! */
8847 gcc_assert (sym->value == NULL);
8852 build_init_assign (sym, init);
8855 /* Resolution of common features of flavors variable and procedure. */
8858 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
8860 /* Constraints on deferred shape variable. */
8861 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
8863 if (sym->attr.allocatable)
8865 if (sym->attr.dimension)
8867 gfc_error ("Allocatable array '%s' at %L must have "
8868 "a deferred shape", sym->name, &sym->declared_at);
8871 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
8872 "may not be ALLOCATABLE", sym->name,
8873 &sym->declared_at) == FAILURE)
8877 if (sym->attr.pointer && sym->attr.dimension)
8879 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
8880 sym->name, &sym->declared_at);
8887 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
8888 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
8890 gfc_error ("Array '%s' at %L cannot have a deferred shape",
8891 sym->name, &sym->declared_at);
8899 /* Additional checks for symbols with flavor variable and derived
8900 type. To be called from resolve_fl_variable. */
8903 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
8905 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
8907 /* Check to see if a derived type is blocked from being host
8908 associated by the presence of another class I symbol in the same
8909 namespace. 14.6.1.3 of the standard and the discussion on
8910 comp.lang.fortran. */
8911 if (sym->ns != sym->ts.u.derived->ns
8912 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
8915 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
8916 if (s && s->attr.flavor != FL_DERIVED)
8918 gfc_error ("The type '%s' cannot be host associated at %L "
8919 "because it is blocked by an incompatible object "
8920 "of the same name declared at %L",
8921 sym->ts.u.derived->name, &sym->declared_at,
8927 /* 4th constraint in section 11.3: "If an object of a type for which
8928 component-initialization is specified (R429) appears in the
8929 specification-part of a module and does not have the ALLOCATABLE
8930 or POINTER attribute, the object shall have the SAVE attribute."
8932 The check for initializers is performed with
8933 has_default_initializer because gfc_default_initializer generates
8934 a hidden default for allocatable components. */
8935 if (!(sym->value || no_init_flag) && sym->ns->proc_name
8936 && sym->ns->proc_name->attr.flavor == FL_MODULE
8937 && !sym->ns->save_all && !sym->attr.save
8938 && !sym->attr.pointer && !sym->attr.allocatable
8939 && has_default_initializer (sym->ts.u.derived))
8941 gfc_error("Object '%s' at %L must have the SAVE attribute for "
8942 "default initialization of a component",
8943 sym->name, &sym->declared_at);
8947 if (sym->ts.type == BT_CLASS)
8950 if (!gfc_type_is_extensible (sym->ts.u.derived->components->ts.u.derived))
8952 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
8953 sym->ts.u.derived->components->ts.u.derived->name,
8954 sym->name, &sym->declared_at);
8959 /* Assume that use associated symbols were checked in the module ns. */
8960 if (!sym->attr.class_ok && !sym->attr.use_assoc)
8962 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
8963 "or pointer", sym->name, &sym->declared_at);
8968 /* Assign default initializer. */
8969 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
8970 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
8972 sym->value = gfc_default_initializer (&sym->ts);
8979 /* Resolve symbols with flavor variable. */
8982 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
8984 int no_init_flag, automatic_flag;
8986 const char *auto_save_msg;
8988 auto_save_msg = "Automatic object '%s' at %L cannot have the "
8991 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8994 /* Set this flag to check that variables are parameters of all entries.
8995 This check is effected by the call to gfc_resolve_expr through
8996 is_non_constant_shape_array. */
8997 specification_expr = 1;
8999 if (sym->ns->proc_name
9000 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9001 || sym->ns->proc_name->attr.is_main_program)
9002 && !sym->attr.use_assoc
9003 && !sym->attr.allocatable
9004 && !sym->attr.pointer
9005 && is_non_constant_shape_array (sym))
9007 /* The shape of a main program or module array needs to be
9009 gfc_error ("The module or main program array '%s' at %L must "
9010 "have constant shape", sym->name, &sym->declared_at);
9011 specification_expr = 0;
9015 if (sym->ts.type == BT_CHARACTER)
9017 /* Make sure that character string variables with assumed length are
9019 e = sym->ts.u.cl->length;
9020 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
9022 gfc_error ("Entity with assumed character length at %L must be a "
9023 "dummy argument or a PARAMETER", &sym->declared_at);
9027 if (e && sym->attr.save && !gfc_is_constant_expr (e))
9029 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9033 if (!gfc_is_constant_expr (e)
9034 && !(e->expr_type == EXPR_VARIABLE
9035 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
9036 && sym->ns->proc_name
9037 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9038 || sym->ns->proc_name->attr.is_main_program)
9039 && !sym->attr.use_assoc)
9041 gfc_error ("'%s' at %L must have constant character length "
9042 "in this context", sym->name, &sym->declared_at);
9047 if (sym->value == NULL && sym->attr.referenced)
9048 apply_default_init_local (sym); /* Try to apply a default initialization. */
9050 /* Determine if the symbol may not have an initializer. */
9051 no_init_flag = automatic_flag = 0;
9052 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
9053 || sym->attr.intrinsic || sym->attr.result)
9055 else if (sym->attr.dimension && !sym->attr.pointer
9056 && is_non_constant_shape_array (sym))
9058 no_init_flag = automatic_flag = 1;
9060 /* Also, they must not have the SAVE attribute.
9061 SAVE_IMPLICIT is checked below. */
9062 if (sym->attr.save == SAVE_EXPLICIT)
9064 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9069 /* Ensure that any initializer is simplified. */
9071 gfc_simplify_expr (sym->value, 1);
9073 /* Reject illegal initializers. */
9074 if (!sym->mark && sym->value)
9076 if (sym->attr.allocatable)
9077 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
9078 sym->name, &sym->declared_at);
9079 else if (sym->attr.external)
9080 gfc_error ("External '%s' at %L cannot have an initializer",
9081 sym->name, &sym->declared_at);
9082 else if (sym->attr.dummy
9083 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
9084 gfc_error ("Dummy '%s' at %L cannot have an initializer",
9085 sym->name, &sym->declared_at);
9086 else if (sym->attr.intrinsic)
9087 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
9088 sym->name, &sym->declared_at);
9089 else if (sym->attr.result)
9090 gfc_error ("Function result '%s' at %L cannot have an initializer",
9091 sym->name, &sym->declared_at);
9092 else if (automatic_flag)
9093 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
9094 sym->name, &sym->declared_at);
9101 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
9102 return resolve_fl_variable_derived (sym, no_init_flag);
9108 /* Resolve a procedure. */
9111 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
9113 gfc_formal_arglist *arg;
9115 if (sym->attr.function
9116 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9119 if (sym->ts.type == BT_CHARACTER)
9121 gfc_charlen *cl = sym->ts.u.cl;
9123 if (cl && cl->length && gfc_is_constant_expr (cl->length)
9124 && resolve_charlen (cl) == FAILURE)
9127 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9128 && sym->attr.proc == PROC_ST_FUNCTION)
9130 gfc_error ("Character-valued statement function '%s' at %L must "
9131 "have constant length", sym->name, &sym->declared_at);
9136 /* Ensure that derived type for are not of a private type. Internal
9137 module procedures are excluded by 2.2.3.3 - i.e., they are not
9138 externally accessible and can access all the objects accessible in
9140 if (!(sym->ns->parent
9141 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
9142 && gfc_check_access(sym->attr.access, sym->ns->default_access))
9144 gfc_interface *iface;
9146 for (arg = sym->formal; arg; arg = arg->next)
9149 && arg->sym->ts.type == BT_DERIVED
9150 && !arg->sym->ts.u.derived->attr.use_assoc
9151 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9152 arg->sym->ts.u.derived->ns->default_access)
9153 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
9154 "PRIVATE type and cannot be a dummy argument"
9155 " of '%s', which is PUBLIC at %L",
9156 arg->sym->name, sym->name, &sym->declared_at)
9159 /* Stop this message from recurring. */
9160 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9165 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9166 PRIVATE to the containing module. */
9167 for (iface = sym->generic; iface; iface = iface->next)
9169 for (arg = iface->sym->formal; arg; arg = arg->next)
9172 && arg->sym->ts.type == BT_DERIVED
9173 && !arg->sym->ts.u.derived->attr.use_assoc
9174 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9175 arg->sym->ts.u.derived->ns->default_access)
9176 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9177 "'%s' in PUBLIC interface '%s' at %L "
9178 "takes dummy arguments of '%s' which is "
9179 "PRIVATE", iface->sym->name, sym->name,
9180 &iface->sym->declared_at,
9181 gfc_typename (&arg->sym->ts)) == FAILURE)
9183 /* Stop this message from recurring. */
9184 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9190 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9191 PRIVATE to the containing module. */
9192 for (iface = sym->generic; iface; iface = iface->next)
9194 for (arg = iface->sym->formal; arg; arg = arg->next)
9197 && arg->sym->ts.type == BT_DERIVED
9198 && !arg->sym->ts.u.derived->attr.use_assoc
9199 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9200 arg->sym->ts.u.derived->ns->default_access)
9201 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9202 "'%s' in PUBLIC interface '%s' at %L "
9203 "takes dummy arguments of '%s' which is "
9204 "PRIVATE", iface->sym->name, sym->name,
9205 &iface->sym->declared_at,
9206 gfc_typename (&arg->sym->ts)) == FAILURE)
9208 /* Stop this message from recurring. */
9209 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9216 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9217 && !sym->attr.proc_pointer)
9219 gfc_error ("Function '%s' at %L cannot have an initializer",
9220 sym->name, &sym->declared_at);
9224 /* An external symbol may not have an initializer because it is taken to be
9225 a procedure. Exception: Procedure Pointers. */
9226 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9228 gfc_error ("External object '%s' at %L may not have an initializer",
9229 sym->name, &sym->declared_at);
9233 /* An elemental function is required to return a scalar 12.7.1 */
9234 if (sym->attr.elemental && sym->attr.function && sym->as)
9236 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9237 "result", sym->name, &sym->declared_at);
9238 /* Reset so that the error only occurs once. */
9239 sym->attr.elemental = 0;
9243 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9244 char-len-param shall not be array-valued, pointer-valued, recursive
9245 or pure. ....snip... A character value of * may only be used in the
9246 following ways: (i) Dummy arg of procedure - dummy associates with
9247 actual length; (ii) To declare a named constant; or (iii) External
9248 function - but length must be declared in calling scoping unit. */
9249 if (sym->attr.function
9250 && sym->ts.type == BT_CHARACTER
9251 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9253 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9254 || (sym->attr.recursive) || (sym->attr.pure))
9256 if (sym->as && sym->as->rank)
9257 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9258 "array-valued", sym->name, &sym->declared_at);
9260 if (sym->attr.pointer)
9261 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9262 "pointer-valued", sym->name, &sym->declared_at);
9265 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9266 "pure", sym->name, &sym->declared_at);
9268 if (sym->attr.recursive)
9269 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9270 "recursive", sym->name, &sym->declared_at);
9275 /* Appendix B.2 of the standard. Contained functions give an
9276 error anyway. Fixed-form is likely to be F77/legacy. */
9277 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9278 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9279 "CHARACTER(*) function '%s' at %L",
9280 sym->name, &sym->declared_at);
9283 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9285 gfc_formal_arglist *curr_arg;
9286 int has_non_interop_arg = 0;
9288 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9289 sym->common_block) == FAILURE)
9291 /* Clear these to prevent looking at them again if there was an
9293 sym->attr.is_bind_c = 0;
9294 sym->attr.is_c_interop = 0;
9295 sym->ts.is_c_interop = 0;
9299 /* So far, no errors have been found. */
9300 sym->attr.is_c_interop = 1;
9301 sym->ts.is_c_interop = 1;
9304 curr_arg = sym->formal;
9305 while (curr_arg != NULL)
9307 /* Skip implicitly typed dummy args here. */
9308 if (curr_arg->sym->attr.implicit_type == 0)
9309 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9310 /* If something is found to fail, record the fact so we
9311 can mark the symbol for the procedure as not being
9312 BIND(C) to try and prevent multiple errors being
9314 has_non_interop_arg = 1;
9316 curr_arg = curr_arg->next;
9319 /* See if any of the arguments were not interoperable and if so, clear
9320 the procedure symbol to prevent duplicate error messages. */
9321 if (has_non_interop_arg != 0)
9323 sym->attr.is_c_interop = 0;
9324 sym->ts.is_c_interop = 0;
9325 sym->attr.is_bind_c = 0;
9329 if (!sym->attr.proc_pointer)
9331 if (sym->attr.save == SAVE_EXPLICIT)
9333 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9334 "in '%s' at %L", sym->name, &sym->declared_at);
9337 if (sym->attr.intent)
9339 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9340 "in '%s' at %L", sym->name, &sym->declared_at);
9343 if (sym->attr.subroutine && sym->attr.result)
9345 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9346 "in '%s' at %L", sym->name, &sym->declared_at);
9349 if (sym->attr.external && sym->attr.function
9350 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9351 || sym->attr.contained))
9353 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9354 "in '%s' at %L", sym->name, &sym->declared_at);
9357 if (strcmp ("ppr@", sym->name) == 0)
9359 gfc_error ("Procedure pointer result '%s' at %L "
9360 "is missing the pointer attribute",
9361 sym->ns->proc_name->name, &sym->declared_at);
9370 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9371 been defined and we now know their defined arguments, check that they fulfill
9372 the requirements of the standard for procedures used as finalizers. */
9375 gfc_resolve_finalizers (gfc_symbol* derived)
9377 gfc_finalizer* list;
9378 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9379 gfc_try result = SUCCESS;
9380 bool seen_scalar = false;
9382 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9385 /* Walk over the list of finalizer-procedures, check them, and if any one
9386 does not fit in with the standard's definition, print an error and remove
9387 it from the list. */
9388 prev_link = &derived->f2k_derived->finalizers;
9389 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9395 /* Skip this finalizer if we already resolved it. */
9396 if (list->proc_tree)
9398 prev_link = &(list->next);
9402 /* Check this exists and is a SUBROUTINE. */
9403 if (!list->proc_sym->attr.subroutine)
9405 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9406 list->proc_sym->name, &list->where);
9410 /* We should have exactly one argument. */
9411 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9413 gfc_error ("FINAL procedure at %L must have exactly one argument",
9417 arg = list->proc_sym->formal->sym;
9419 /* This argument must be of our type. */
9420 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9422 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9423 &arg->declared_at, derived->name);
9427 /* It must neither be a pointer nor allocatable nor optional. */
9428 if (arg->attr.pointer)
9430 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9434 if (arg->attr.allocatable)
9436 gfc_error ("Argument of FINAL procedure at %L must not be"
9437 " ALLOCATABLE", &arg->declared_at);
9440 if (arg->attr.optional)
9442 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9447 /* It must not be INTENT(OUT). */
9448 if (arg->attr.intent == INTENT_OUT)
9450 gfc_error ("Argument of FINAL procedure at %L must not be"
9451 " INTENT(OUT)", &arg->declared_at);
9455 /* Warn if the procedure is non-scalar and not assumed shape. */
9456 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9457 && arg->as->type != AS_ASSUMED_SHAPE)
9458 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9459 " shape argument", &arg->declared_at);
9461 /* Check that it does not match in kind and rank with a FINAL procedure
9462 defined earlier. To really loop over the *earlier* declarations,
9463 we need to walk the tail of the list as new ones were pushed at the
9465 /* TODO: Handle kind parameters once they are implemented. */
9466 my_rank = (arg->as ? arg->as->rank : 0);
9467 for (i = list->next; i; i = i->next)
9469 /* Argument list might be empty; that is an error signalled earlier,
9470 but we nevertheless continued resolving. */
9471 if (i->proc_sym->formal)
9473 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9474 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9475 if (i_rank == my_rank)
9477 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9478 " rank (%d) as '%s'",
9479 list->proc_sym->name, &list->where, my_rank,
9486 /* Is this the/a scalar finalizer procedure? */
9487 if (!arg->as || arg->as->rank == 0)
9490 /* Find the symtree for this procedure. */
9491 gcc_assert (!list->proc_tree);
9492 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9494 prev_link = &list->next;
9497 /* Remove wrong nodes immediately from the list so we don't risk any
9498 troubles in the future when they might fail later expectations. */
9502 *prev_link = list->next;
9503 gfc_free_finalizer (i);
9506 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9507 were nodes in the list, must have been for arrays. It is surely a good
9508 idea to have a scalar version there if there's something to finalize. */
9509 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9510 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9511 " defined at %L, suggest also scalar one",
9512 derived->name, &derived->declared_at);
9514 /* TODO: Remove this error when finalization is finished. */
9515 gfc_error ("Finalization at %L is not yet implemented",
9516 &derived->declared_at);
9522 /* Check that it is ok for the typebound procedure proc to override the
9526 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9529 const gfc_symbol* proc_target;
9530 const gfc_symbol* old_target;
9531 unsigned proc_pass_arg, old_pass_arg, argpos;
9532 gfc_formal_arglist* proc_formal;
9533 gfc_formal_arglist* old_formal;
9535 /* This procedure should only be called for non-GENERIC proc. */
9536 gcc_assert (!proc->n.tb->is_generic);
9538 /* If the overwritten procedure is GENERIC, this is an error. */
9539 if (old->n.tb->is_generic)
9541 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9542 old->name, &proc->n.tb->where);
9546 where = proc->n.tb->where;
9547 proc_target = proc->n.tb->u.specific->n.sym;
9548 old_target = old->n.tb->u.specific->n.sym;
9550 /* Check that overridden binding is not NON_OVERRIDABLE. */
9551 if (old->n.tb->non_overridable)
9553 gfc_error ("'%s' at %L overrides a procedure binding declared"
9554 " NON_OVERRIDABLE", proc->name, &where);
9558 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9559 if (!old->n.tb->deferred && proc->n.tb->deferred)
9561 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9562 " non-DEFERRED binding", proc->name, &where);
9566 /* If the overridden binding is PURE, the overriding must be, too. */
9567 if (old_target->attr.pure && !proc_target->attr.pure)
9569 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9570 proc->name, &where);
9574 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9575 is not, the overriding must not be either. */
9576 if (old_target->attr.elemental && !proc_target->attr.elemental)
9578 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
9579 " ELEMENTAL", proc->name, &where);
9582 if (!old_target->attr.elemental && proc_target->attr.elemental)
9584 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
9585 " be ELEMENTAL, either", proc->name, &where);
9589 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
9591 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
9593 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
9594 " SUBROUTINE", proc->name, &where);
9598 /* If the overridden binding is a FUNCTION, the overriding must also be a
9599 FUNCTION and have the same characteristics. */
9600 if (old_target->attr.function)
9602 if (!proc_target->attr.function)
9604 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
9605 " FUNCTION", proc->name, &where);
9609 /* FIXME: Do more comprehensive checking (including, for instance, the
9610 rank and array-shape). */
9611 gcc_assert (proc_target->result && old_target->result);
9612 if (!gfc_compare_types (&proc_target->result->ts,
9613 &old_target->result->ts))
9615 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
9616 " matching result types", proc->name, &where);
9621 /* If the overridden binding is PUBLIC, the overriding one must not be
9623 if (old->n.tb->access == ACCESS_PUBLIC
9624 && proc->n.tb->access == ACCESS_PRIVATE)
9626 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
9627 " PRIVATE", proc->name, &where);
9631 /* Compare the formal argument lists of both procedures. This is also abused
9632 to find the position of the passed-object dummy arguments of both
9633 bindings as at least the overridden one might not yet be resolved and we
9634 need those positions in the check below. */
9635 proc_pass_arg = old_pass_arg = 0;
9636 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
9638 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
9641 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
9642 proc_formal && old_formal;
9643 proc_formal = proc_formal->next, old_formal = old_formal->next)
9645 if (proc->n.tb->pass_arg
9646 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
9647 proc_pass_arg = argpos;
9648 if (old->n.tb->pass_arg
9649 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
9650 old_pass_arg = argpos;
9652 /* Check that the names correspond. */
9653 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
9655 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
9656 " to match the corresponding argument of the overridden"
9657 " procedure", proc_formal->sym->name, proc->name, &where,
9658 old_formal->sym->name);
9662 /* Check that the types correspond if neither is the passed-object
9664 /* FIXME: Do more comprehensive testing here. */
9665 if (proc_pass_arg != argpos && old_pass_arg != argpos
9666 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
9668 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
9669 "in respect to the overridden procedure",
9670 proc_formal->sym->name, proc->name, &where);
9676 if (proc_formal || old_formal)
9678 gfc_error ("'%s' at %L must have the same number of formal arguments as"
9679 " the overridden procedure", proc->name, &where);
9683 /* If the overridden binding is NOPASS, the overriding one must also be
9685 if (old->n.tb->nopass && !proc->n.tb->nopass)
9687 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
9688 " NOPASS", proc->name, &where);
9692 /* If the overridden binding is PASS(x), the overriding one must also be
9693 PASS and the passed-object dummy arguments must correspond. */
9694 if (!old->n.tb->nopass)
9696 if (proc->n.tb->nopass)
9698 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
9699 " PASS", proc->name, &where);
9703 if (proc_pass_arg != old_pass_arg)
9705 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
9706 " the same position as the passed-object dummy argument of"
9707 " the overridden procedure", proc->name, &where);
9716 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
9719 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
9720 const char* generic_name, locus where)
9725 gcc_assert (t1->specific && t2->specific);
9726 gcc_assert (!t1->specific->is_generic);
9727 gcc_assert (!t2->specific->is_generic);
9729 sym1 = t1->specific->u.specific->n.sym;
9730 sym2 = t2->specific->u.specific->n.sym;
9735 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
9736 if (sym1->attr.subroutine != sym2->attr.subroutine
9737 || sym1->attr.function != sym2->attr.function)
9739 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
9740 " GENERIC '%s' at %L",
9741 sym1->name, sym2->name, generic_name, &where);
9745 /* Compare the interfaces. */
9746 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
9748 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
9749 sym1->name, sym2->name, generic_name, &where);
9757 /* Worker function for resolving a generic procedure binding; this is used to
9758 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
9760 The difference between those cases is finding possible inherited bindings
9761 that are overridden, as one has to look for them in tb_sym_root,
9762 tb_uop_root or tb_op, respectively. Thus the caller must already find
9763 the super-type and set p->overridden correctly. */
9766 resolve_tb_generic_targets (gfc_symbol* super_type,
9767 gfc_typebound_proc* p, const char* name)
9769 gfc_tbp_generic* target;
9770 gfc_symtree* first_target;
9771 gfc_symtree* inherited;
9773 gcc_assert (p && p->is_generic);
9775 /* Try to find the specific bindings for the symtrees in our target-list. */
9776 gcc_assert (p->u.generic);
9777 for (target = p->u.generic; target; target = target->next)
9778 if (!target->specific)
9780 gfc_typebound_proc* overridden_tbp;
9782 const char* target_name;
9784 target_name = target->specific_st->name;
9786 /* Defined for this type directly. */
9787 if (target->specific_st->n.tb)
9789 target->specific = target->specific_st->n.tb;
9790 goto specific_found;
9793 /* Look for an inherited specific binding. */
9796 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
9801 gcc_assert (inherited->n.tb);
9802 target->specific = inherited->n.tb;
9803 goto specific_found;
9807 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
9808 " at %L", target_name, name, &p->where);
9811 /* Once we've found the specific binding, check it is not ambiguous with
9812 other specifics already found or inherited for the same GENERIC. */
9814 gcc_assert (target->specific);
9816 /* This must really be a specific binding! */
9817 if (target->specific->is_generic)
9819 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
9820 " '%s' is GENERIC, too", name, &p->where, target_name);
9824 /* Check those already resolved on this type directly. */
9825 for (g = p->u.generic; g; g = g->next)
9826 if (g != target && g->specific
9827 && check_generic_tbp_ambiguity (target, g, name, p->where)
9831 /* Check for ambiguity with inherited specific targets. */
9832 for (overridden_tbp = p->overridden; overridden_tbp;
9833 overridden_tbp = overridden_tbp->overridden)
9834 if (overridden_tbp->is_generic)
9836 for (g = overridden_tbp->u.generic; g; g = g->next)
9838 gcc_assert (g->specific);
9839 if (check_generic_tbp_ambiguity (target, g,
9840 name, p->where) == FAILURE)
9846 /* If we attempt to "overwrite" a specific binding, this is an error. */
9847 if (p->overridden && !p->overridden->is_generic)
9849 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
9850 " the same name", name, &p->where);
9854 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
9855 all must have the same attributes here. */
9856 first_target = p->u.generic->specific->u.specific;
9857 gcc_assert (first_target);
9858 p->subroutine = first_target->n.sym->attr.subroutine;
9859 p->function = first_target->n.sym->attr.function;
9865 /* Resolve a GENERIC procedure binding for a derived type. */
9868 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
9870 gfc_symbol* super_type;
9872 /* Find the overridden binding if any. */
9873 st->n.tb->overridden = NULL;
9874 super_type = gfc_get_derived_super_type (derived);
9877 gfc_symtree* overridden;
9878 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
9881 if (overridden && overridden->n.tb)
9882 st->n.tb->overridden = overridden->n.tb;
9885 /* Resolve using worker function. */
9886 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
9890 /* Retrieve the target-procedure of an operator binding and do some checks in
9891 common for intrinsic and user-defined type-bound operators. */
9894 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
9896 gfc_symbol* target_proc;
9898 gcc_assert (target->specific && !target->specific->is_generic);
9899 target_proc = target->specific->u.specific->n.sym;
9900 gcc_assert (target_proc);
9902 /* All operator bindings must have a passed-object dummy argument. */
9903 if (target->specific->nopass)
9905 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
9913 /* Resolve a type-bound intrinsic operator. */
9916 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
9917 gfc_typebound_proc* p)
9919 gfc_symbol* super_type;
9920 gfc_tbp_generic* target;
9922 /* If there's already an error here, do nothing (but don't fail again). */
9926 /* Operators should always be GENERIC bindings. */
9927 gcc_assert (p->is_generic);
9929 /* Look for an overridden binding. */
9930 super_type = gfc_get_derived_super_type (derived);
9931 if (super_type && super_type->f2k_derived)
9932 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
9935 p->overridden = NULL;
9937 /* Resolve general GENERIC properties using worker function. */
9938 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
9941 /* Check the targets to be procedures of correct interface. */
9942 for (target = p->u.generic; target; target = target->next)
9944 gfc_symbol* target_proc;
9946 target_proc = get_checked_tb_operator_target (target, p->where);
9950 if (!gfc_check_operator_interface (target_proc, op, p->where))
9962 /* Resolve a type-bound user operator (tree-walker callback). */
9964 static gfc_symbol* resolve_bindings_derived;
9965 static gfc_try resolve_bindings_result;
9967 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
9970 resolve_typebound_user_op (gfc_symtree* stree)
9972 gfc_symbol* super_type;
9973 gfc_tbp_generic* target;
9975 gcc_assert (stree && stree->n.tb);
9977 if (stree->n.tb->error)
9980 /* Operators should always be GENERIC bindings. */
9981 gcc_assert (stree->n.tb->is_generic);
9983 /* Find overridden procedure, if any. */
9984 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9985 if (super_type && super_type->f2k_derived)
9987 gfc_symtree* overridden;
9988 overridden = gfc_find_typebound_user_op (super_type, NULL,
9989 stree->name, true, NULL);
9991 if (overridden && overridden->n.tb)
9992 stree->n.tb->overridden = overridden->n.tb;
9995 stree->n.tb->overridden = NULL;
9997 /* Resolve basically using worker function. */
9998 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10002 /* Check the targets to be functions of correct interface. */
10003 for (target = stree->n.tb->u.generic; target; target = target->next)
10005 gfc_symbol* target_proc;
10007 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10011 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10018 resolve_bindings_result = FAILURE;
10019 stree->n.tb->error = 1;
10023 /* Resolve the type-bound procedures for a derived type. */
10026 resolve_typebound_procedure (gfc_symtree* stree)
10030 gfc_symbol* me_arg;
10031 gfc_symbol* super_type;
10032 gfc_component* comp;
10034 gcc_assert (stree);
10036 /* Undefined specific symbol from GENERIC target definition. */
10040 if (stree->n.tb->error)
10043 /* If this is a GENERIC binding, use that routine. */
10044 if (stree->n.tb->is_generic)
10046 if (resolve_typebound_generic (resolve_bindings_derived, stree)
10052 /* Get the target-procedure to check it. */
10053 gcc_assert (!stree->n.tb->is_generic);
10054 gcc_assert (stree->n.tb->u.specific);
10055 proc = stree->n.tb->u.specific->n.sym;
10056 where = stree->n.tb->where;
10058 /* Default access should already be resolved from the parser. */
10059 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
10061 /* It should be a module procedure or an external procedure with explicit
10062 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
10063 if ((!proc->attr.subroutine && !proc->attr.function)
10064 || (proc->attr.proc != PROC_MODULE
10065 && proc->attr.if_source != IFSRC_IFBODY)
10066 || (proc->attr.abstract && !stree->n.tb->deferred))
10068 gfc_error ("'%s' must be a module procedure or an external procedure with"
10069 " an explicit interface at %L", proc->name, &where);
10072 stree->n.tb->subroutine = proc->attr.subroutine;
10073 stree->n.tb->function = proc->attr.function;
10075 /* Find the super-type of the current derived type. We could do this once and
10076 store in a global if speed is needed, but as long as not I believe this is
10077 more readable and clearer. */
10078 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10080 /* If PASS, resolve and check arguments if not already resolved / loaded
10081 from a .mod file. */
10082 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
10084 if (stree->n.tb->pass_arg)
10086 gfc_formal_arglist* i;
10088 /* If an explicit passing argument name is given, walk the arg-list
10089 and look for it. */
10092 stree->n.tb->pass_arg_num = 1;
10093 for (i = proc->formal; i; i = i->next)
10095 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
10100 ++stree->n.tb->pass_arg_num;
10105 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
10107 proc->name, stree->n.tb->pass_arg, &where,
10108 stree->n.tb->pass_arg);
10114 /* Otherwise, take the first one; there should in fact be at least
10116 stree->n.tb->pass_arg_num = 1;
10119 gfc_error ("Procedure '%s' with PASS at %L must have at"
10120 " least one argument", proc->name, &where);
10123 me_arg = proc->formal->sym;
10126 /* Now check that the argument-type matches and the passed-object
10127 dummy argument is generally fine. */
10129 gcc_assert (me_arg);
10131 if (me_arg->ts.type != BT_CLASS)
10133 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10134 " at %L", proc->name, &where);
10138 if (me_arg->ts.u.derived->components->ts.u.derived
10139 != resolve_bindings_derived)
10141 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10142 " the derived-type '%s'", me_arg->name, proc->name,
10143 me_arg->name, &where, resolve_bindings_derived->name);
10147 gcc_assert (me_arg->ts.type == BT_CLASS);
10148 if (me_arg->ts.u.derived->components->as
10149 && me_arg->ts.u.derived->components->as->rank > 0)
10151 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
10152 " scalar", proc->name, &where);
10155 if (me_arg->ts.u.derived->components->attr.allocatable)
10157 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10158 " be ALLOCATABLE", proc->name, &where);
10161 if (me_arg->ts.u.derived->components->attr.class_pointer)
10163 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10164 " be POINTER", proc->name, &where);
10169 /* If we are extending some type, check that we don't override a procedure
10170 flagged NON_OVERRIDABLE. */
10171 stree->n.tb->overridden = NULL;
10174 gfc_symtree* overridden;
10175 overridden = gfc_find_typebound_proc (super_type, NULL,
10176 stree->name, true, NULL);
10178 if (overridden && overridden->n.tb)
10179 stree->n.tb->overridden = overridden->n.tb;
10181 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
10185 /* See if there's a name collision with a component directly in this type. */
10186 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
10187 if (!strcmp (comp->name, stree->name))
10189 gfc_error ("Procedure '%s' at %L has the same name as a component of"
10191 stree->name, &where, resolve_bindings_derived->name);
10195 /* Try to find a name collision with an inherited component. */
10196 if (super_type && gfc_find_component (super_type, stree->name, true, true))
10198 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
10199 " component of '%s'",
10200 stree->name, &where, resolve_bindings_derived->name);
10204 stree->n.tb->error = 0;
10208 resolve_bindings_result = FAILURE;
10209 stree->n.tb->error = 1;
10213 resolve_typebound_procedures (gfc_symbol* derived)
10217 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10220 resolve_bindings_derived = derived;
10221 resolve_bindings_result = SUCCESS;
10223 if (derived->f2k_derived->tb_sym_root)
10224 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10225 &resolve_typebound_procedure);
10227 if (derived->f2k_derived->tb_uop_root)
10228 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10229 &resolve_typebound_user_op);
10231 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10233 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10234 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10236 resolve_bindings_result = FAILURE;
10239 return resolve_bindings_result;
10243 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10244 to give all identical derived types the same backend_decl. */
10246 add_dt_to_dt_list (gfc_symbol *derived)
10248 gfc_dt_list *dt_list;
10250 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10251 if (derived == dt_list->derived)
10254 if (dt_list == NULL)
10256 dt_list = gfc_get_dt_list ();
10257 dt_list->next = gfc_derived_types;
10258 dt_list->derived = derived;
10259 gfc_derived_types = dt_list;
10264 /* Ensure that a derived-type is really not abstract, meaning that every
10265 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10268 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10273 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10275 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10278 if (st->n.tb && st->n.tb->deferred)
10280 gfc_symtree* overriding;
10281 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10282 gcc_assert (overriding && overriding->n.tb);
10283 if (overriding->n.tb->deferred)
10285 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10286 " '%s' is DEFERRED and not overridden",
10287 sub->name, &sub->declared_at, st->name);
10296 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10298 /* The algorithm used here is to recursively travel up the ancestry of sub
10299 and for each ancestor-type, check all bindings. If any of them is
10300 DEFERRED, look it up starting from sub and see if the found (overriding)
10301 binding is not DEFERRED.
10302 This is not the most efficient way to do this, but it should be ok and is
10303 clearer than something sophisticated. */
10305 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
10307 /* Walk bindings of this ancestor. */
10308 if (ancestor->f2k_derived)
10311 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10316 /* Find next ancestor type and recurse on it. */
10317 ancestor = gfc_get_derived_super_type (ancestor);
10319 return ensure_not_abstract (sub, ancestor);
10325 static void resolve_symbol (gfc_symbol *sym);
10328 /* Resolve the components of a derived type. */
10331 resolve_fl_derived (gfc_symbol *sym)
10333 gfc_symbol* super_type;
10337 super_type = gfc_get_derived_super_type (sym);
10339 /* Ensure the extended type gets resolved before we do. */
10340 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10343 /* An ABSTRACT type must be extensible. */
10344 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10346 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10347 sym->name, &sym->declared_at);
10351 for (c = sym->components; c != NULL; c = c->next)
10353 if (c->attr.proc_pointer && c->ts.interface)
10355 if (c->ts.interface->attr.procedure)
10356 gfc_error ("Interface '%s', used by procedure pointer component "
10357 "'%s' at %L, is declared in a later PROCEDURE statement",
10358 c->ts.interface->name, c->name, &c->loc);
10360 /* Get the attributes from the interface (now resolved). */
10361 if (c->ts.interface->attr.if_source
10362 || c->ts.interface->attr.intrinsic)
10364 gfc_symbol *ifc = c->ts.interface;
10366 if (ifc->formal && !ifc->formal_ns)
10367 resolve_symbol (ifc);
10369 if (ifc->attr.intrinsic)
10370 resolve_intrinsic (ifc, &ifc->declared_at);
10374 c->ts = ifc->result->ts;
10375 c->attr.allocatable = ifc->result->attr.allocatable;
10376 c->attr.pointer = ifc->result->attr.pointer;
10377 c->attr.dimension = ifc->result->attr.dimension;
10378 c->as = gfc_copy_array_spec (ifc->result->as);
10383 c->attr.allocatable = ifc->attr.allocatable;
10384 c->attr.pointer = ifc->attr.pointer;
10385 c->attr.dimension = ifc->attr.dimension;
10386 c->as = gfc_copy_array_spec (ifc->as);
10388 c->ts.interface = ifc;
10389 c->attr.function = ifc->attr.function;
10390 c->attr.subroutine = ifc->attr.subroutine;
10391 gfc_copy_formal_args_ppc (c, ifc);
10393 c->attr.pure = ifc->attr.pure;
10394 c->attr.elemental = ifc->attr.elemental;
10395 c->attr.recursive = ifc->attr.recursive;
10396 c->attr.always_explicit = ifc->attr.always_explicit;
10397 c->attr.ext_attr |= ifc->attr.ext_attr;
10398 /* Replace symbols in array spec. */
10402 for (i = 0; i < c->as->rank; i++)
10404 gfc_expr_replace_comp (c->as->lower[i], c);
10405 gfc_expr_replace_comp (c->as->upper[i], c);
10408 /* Copy char length. */
10409 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10411 c->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10412 gfc_expr_replace_comp (c->ts.u.cl->length, c);
10415 else if (c->ts.interface->name[0] != '\0')
10417 gfc_error ("Interface '%s' of procedure pointer component "
10418 "'%s' at %L must be explicit", c->ts.interface->name,
10423 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10425 /* Since PPCs are not implicitly typed, a PPC without an explicit
10426 interface must be a subroutine. */
10427 gfc_add_subroutine (&c->attr, c->name, &c->loc);
10430 /* Procedure pointer components: Check PASS arg. */
10431 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0)
10433 gfc_symbol* me_arg;
10435 if (c->tb->pass_arg)
10437 gfc_formal_arglist* i;
10439 /* If an explicit passing argument name is given, walk the arg-list
10440 and look for it. */
10443 c->tb->pass_arg_num = 1;
10444 for (i = c->formal; i; i = i->next)
10446 if (!strcmp (i->sym->name, c->tb->pass_arg))
10451 c->tb->pass_arg_num++;
10456 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10457 "at %L has no argument '%s'", c->name,
10458 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10465 /* Otherwise, take the first one; there should in fact be at least
10467 c->tb->pass_arg_num = 1;
10470 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10471 "must have at least one argument",
10476 me_arg = c->formal->sym;
10479 /* Now check that the argument-type matches. */
10480 gcc_assert (me_arg);
10481 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10482 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10483 || (me_arg->ts.type == BT_CLASS
10484 && me_arg->ts.u.derived->components->ts.u.derived != sym))
10486 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10487 " the derived type '%s'", me_arg->name, c->name,
10488 me_arg->name, &c->loc, sym->name);
10493 /* Check for C453. */
10494 if (me_arg->attr.dimension)
10496 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10497 "must be scalar", me_arg->name, c->name, me_arg->name,
10503 if (me_arg->attr.pointer)
10505 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10506 "may not have the POINTER attribute", me_arg->name,
10507 c->name, me_arg->name, &c->loc);
10512 if (me_arg->attr.allocatable)
10514 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10515 "may not be ALLOCATABLE", me_arg->name, c->name,
10516 me_arg->name, &c->loc);
10521 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
10522 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10523 " at %L", c->name, &c->loc);
10527 /* Check type-spec if this is not the parent-type component. */
10528 if ((!sym->attr.extension || c != sym->components)
10529 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
10532 /* If this type is an extension, set the accessibility of the parent
10534 if (super_type && c == sym->components
10535 && strcmp (super_type->name, c->name) == 0)
10536 c->attr.access = super_type->attr.access;
10538 /* If this type is an extension, see if this component has the same name
10539 as an inherited type-bound procedure. */
10541 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
10543 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
10544 " inherited type-bound procedure",
10545 c->name, sym->name, &c->loc);
10549 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
10551 if (c->ts.u.cl->length == NULL
10552 || (resolve_charlen (c->ts.u.cl) == FAILURE)
10553 || !gfc_is_constant_expr (c->ts.u.cl->length))
10555 gfc_error ("Character length of component '%s' needs to "
10556 "be a constant specification expression at %L",
10558 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
10563 if (c->ts.type == BT_DERIVED
10564 && sym->component_access != ACCESS_PRIVATE
10565 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10566 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
10567 && !c->ts.u.derived->attr.use_assoc
10568 && !gfc_check_access (c->ts.u.derived->attr.access,
10569 c->ts.u.derived->ns->default_access)
10570 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
10571 "is a PRIVATE type and cannot be a component of "
10572 "'%s', which is PUBLIC at %L", c->name,
10573 sym->name, &sym->declared_at) == FAILURE)
10576 if (sym->attr.sequence)
10578 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
10580 gfc_error ("Component %s of SEQUENCE type declared at %L does "
10581 "not have the SEQUENCE attribute",
10582 c->ts.u.derived->name, &sym->declared_at);
10587 if (c->ts.type == BT_DERIVED && c->attr.pointer
10588 && c->ts.u.derived->components == NULL
10589 && !c->ts.u.derived->attr.zero_comp)
10591 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10592 "that has not been declared", c->name, sym->name,
10598 if (c->ts.type == BT_CLASS
10599 && !(c->ts.u.derived->components->attr.pointer
10600 || c->ts.u.derived->components->attr.allocatable))
10602 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
10603 "or pointer", c->name, &c->loc);
10607 /* Ensure that all the derived type components are put on the
10608 derived type list; even in formal namespaces, where derived type
10609 pointer components might not have been declared. */
10610 if (c->ts.type == BT_DERIVED
10612 && c->ts.u.derived->components
10614 && sym != c->ts.u.derived)
10615 add_dt_to_dt_list (c->ts.u.derived);
10617 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
10621 for (i = 0; i < c->as->rank; i++)
10623 if (c->as->lower[i] == NULL
10624 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
10625 || !gfc_is_constant_expr (c->as->lower[i])
10626 || c->as->upper[i] == NULL
10627 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
10628 || !gfc_is_constant_expr (c->as->upper[i]))
10630 gfc_error ("Component '%s' of '%s' at %L must have "
10631 "constant array bounds",
10632 c->name, sym->name, &c->loc);
10638 /* Resolve the type-bound procedures. */
10639 if (resolve_typebound_procedures (sym) == FAILURE)
10642 /* Resolve the finalizer procedures. */
10643 if (gfc_resolve_finalizers (sym) == FAILURE)
10646 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
10647 all DEFERRED bindings are overridden. */
10648 if (super_type && super_type->attr.abstract && !sym->attr.abstract
10649 && ensure_not_abstract (sym, super_type) == FAILURE)
10652 /* Add derived type to the derived type list. */
10653 add_dt_to_dt_list (sym);
10660 resolve_fl_namelist (gfc_symbol *sym)
10665 /* Reject PRIVATE objects in a PUBLIC namelist. */
10666 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
10668 for (nl = sym->namelist; nl; nl = nl->next)
10670 if (!nl->sym->attr.use_assoc
10671 && !is_sym_host_assoc (nl->sym, sym->ns)
10672 && !gfc_check_access(nl->sym->attr.access,
10673 nl->sym->ns->default_access))
10675 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
10676 "cannot be member of PUBLIC namelist '%s' at %L",
10677 nl->sym->name, sym->name, &sym->declared_at);
10681 /* Types with private components that came here by USE-association. */
10682 if (nl->sym->ts.type == BT_DERIVED
10683 && derived_inaccessible (nl->sym->ts.u.derived))
10685 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
10686 "components and cannot be member of namelist '%s' at %L",
10687 nl->sym->name, sym->name, &sym->declared_at);
10691 /* Types with private components that are defined in the same module. */
10692 if (nl->sym->ts.type == BT_DERIVED
10693 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
10694 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
10695 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
10696 nl->sym->ns->default_access))
10698 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
10699 "cannot be a member of PUBLIC namelist '%s' at %L",
10700 nl->sym->name, sym->name, &sym->declared_at);
10706 for (nl = sym->namelist; nl; nl = nl->next)
10708 /* Reject namelist arrays of assumed shape. */
10709 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
10710 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
10711 "must not have assumed shape in namelist "
10712 "'%s' at %L", nl->sym->name, sym->name,
10713 &sym->declared_at) == FAILURE)
10716 /* Reject namelist arrays that are not constant shape. */
10717 if (is_non_constant_shape_array (nl->sym))
10719 gfc_error ("NAMELIST array object '%s' must have constant "
10720 "shape in namelist '%s' at %L", nl->sym->name,
10721 sym->name, &sym->declared_at);
10725 /* Namelist objects cannot have allocatable or pointer components. */
10726 if (nl->sym->ts.type != BT_DERIVED)
10729 if (nl->sym->ts.u.derived->attr.alloc_comp)
10731 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10732 "have ALLOCATABLE components",
10733 nl->sym->name, sym->name, &sym->declared_at);
10737 if (nl->sym->ts.u.derived->attr.pointer_comp)
10739 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10740 "have POINTER components",
10741 nl->sym->name, sym->name, &sym->declared_at);
10747 /* 14.1.2 A module or internal procedure represent local entities
10748 of the same type as a namelist member and so are not allowed. */
10749 for (nl = sym->namelist; nl; nl = nl->next)
10751 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
10754 if (nl->sym->attr.function && nl->sym == nl->sym->result)
10755 if ((nl->sym == sym->ns->proc_name)
10757 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
10761 if (nl->sym && nl->sym->name)
10762 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
10763 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
10765 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
10766 "attribute in '%s' at %L", nlsym->name,
10767 &sym->declared_at);
10777 resolve_fl_parameter (gfc_symbol *sym)
10779 /* A parameter array's shape needs to be constant. */
10780 if (sym->as != NULL
10781 && (sym->as->type == AS_DEFERRED
10782 || is_non_constant_shape_array (sym)))
10784 gfc_error ("Parameter array '%s' at %L cannot be automatic "
10785 "or of deferred shape", sym->name, &sym->declared_at);
10789 /* Make sure a parameter that has been implicitly typed still
10790 matches the implicit type, since PARAMETER statements can precede
10791 IMPLICIT statements. */
10792 if (sym->attr.implicit_type
10793 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
10796 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
10797 "later IMPLICIT type", sym->name, &sym->declared_at);
10801 /* Make sure the types of derived parameters are consistent. This
10802 type checking is deferred until resolution because the type may
10803 refer to a derived type from the host. */
10804 if (sym->ts.type == BT_DERIVED
10805 && !gfc_compare_types (&sym->ts, &sym->value->ts))
10807 gfc_error ("Incompatible derived type in PARAMETER at %L",
10808 &sym->value->where);
10815 /* Do anything necessary to resolve a symbol. Right now, we just
10816 assume that an otherwise unknown symbol is a variable. This sort
10817 of thing commonly happens for symbols in module. */
10820 resolve_symbol (gfc_symbol *sym)
10822 int check_constant, mp_flag;
10823 gfc_symtree *symtree;
10824 gfc_symtree *this_symtree;
10828 if (sym->attr.flavor == FL_UNKNOWN)
10831 /* If we find that a flavorless symbol is an interface in one of the
10832 parent namespaces, find its symtree in this namespace, free the
10833 symbol and set the symtree to point to the interface symbol. */
10834 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
10836 symtree = gfc_find_symtree (ns->sym_root, sym->name);
10837 if (symtree && symtree->n.sym->generic)
10839 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
10843 gfc_free_symbol (sym);
10844 symtree->n.sym->refs++;
10845 this_symtree->n.sym = symtree->n.sym;
10850 /* Otherwise give it a flavor according to such attributes as
10852 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
10853 sym->attr.flavor = FL_VARIABLE;
10856 sym->attr.flavor = FL_PROCEDURE;
10857 if (sym->attr.dimension)
10858 sym->attr.function = 1;
10862 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
10863 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
10865 if (sym->attr.procedure && sym->ts.interface
10866 && sym->attr.if_source != IFSRC_DECL)
10868 if (sym->ts.interface == sym)
10870 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
10871 "interface", sym->name, &sym->declared_at);
10874 if (sym->ts.interface->attr.procedure)
10876 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
10877 " in a later PROCEDURE statement", sym->ts.interface->name,
10878 sym->name,&sym->declared_at);
10882 /* Get the attributes from the interface (now resolved). */
10883 if (sym->ts.interface->attr.if_source
10884 || sym->ts.interface->attr.intrinsic)
10886 gfc_symbol *ifc = sym->ts.interface;
10887 resolve_symbol (ifc);
10889 if (ifc->attr.intrinsic)
10890 resolve_intrinsic (ifc, &ifc->declared_at);
10893 sym->ts = ifc->result->ts;
10896 sym->ts.interface = ifc;
10897 sym->attr.function = ifc->attr.function;
10898 sym->attr.subroutine = ifc->attr.subroutine;
10899 gfc_copy_formal_args (sym, ifc);
10901 sym->attr.allocatable = ifc->attr.allocatable;
10902 sym->attr.pointer = ifc->attr.pointer;
10903 sym->attr.pure = ifc->attr.pure;
10904 sym->attr.elemental = ifc->attr.elemental;
10905 sym->attr.dimension = ifc->attr.dimension;
10906 sym->attr.recursive = ifc->attr.recursive;
10907 sym->attr.always_explicit = ifc->attr.always_explicit;
10908 sym->attr.ext_attr |= ifc->attr.ext_attr;
10909 /* Copy array spec. */
10910 sym->as = gfc_copy_array_spec (ifc->as);
10914 for (i = 0; i < sym->as->rank; i++)
10916 gfc_expr_replace_symbols (sym->as->lower[i], sym);
10917 gfc_expr_replace_symbols (sym->as->upper[i], sym);
10920 /* Copy char length. */
10921 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10923 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10924 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
10927 else if (sym->ts.interface->name[0] != '\0')
10929 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
10930 sym->ts.interface->name, sym->name, &sym->declared_at);
10935 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
10938 /* Symbols that are module procedures with results (functions) have
10939 the types and array specification copied for type checking in
10940 procedures that call them, as well as for saving to a module
10941 file. These symbols can't stand the scrutiny that their results
10943 mp_flag = (sym->result != NULL && sym->result != sym);
10946 /* Make sure that the intrinsic is consistent with its internal
10947 representation. This needs to be done before assigning a default
10948 type to avoid spurious warnings. */
10949 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
10950 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
10953 /* Assign default type to symbols that need one and don't have one. */
10954 if (sym->ts.type == BT_UNKNOWN)
10956 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
10957 gfc_set_default_type (sym, 1, NULL);
10959 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
10960 && !sym->attr.function && !sym->attr.subroutine
10961 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
10962 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
10964 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
10966 /* The specific case of an external procedure should emit an error
10967 in the case that there is no implicit type. */
10969 gfc_set_default_type (sym, sym->attr.external, NULL);
10972 /* Result may be in another namespace. */
10973 resolve_symbol (sym->result);
10975 if (!sym->result->attr.proc_pointer)
10977 sym->ts = sym->result->ts;
10978 sym->as = gfc_copy_array_spec (sym->result->as);
10979 sym->attr.dimension = sym->result->attr.dimension;
10980 sym->attr.pointer = sym->result->attr.pointer;
10981 sym->attr.allocatable = sym->result->attr.allocatable;
10987 /* Assumed size arrays and assumed shape arrays must be dummy
10990 if (sym->as != NULL
10991 && (sym->as->type == AS_ASSUMED_SIZE
10992 || sym->as->type == AS_ASSUMED_SHAPE)
10993 && sym->attr.dummy == 0)
10995 if (sym->as->type == AS_ASSUMED_SIZE)
10996 gfc_error ("Assumed size array at %L must be a dummy argument",
10997 &sym->declared_at);
10999 gfc_error ("Assumed shape array at %L must be a dummy argument",
11000 &sym->declared_at);
11004 /* Make sure symbols with known intent or optional are really dummy
11005 variable. Because of ENTRY statement, this has to be deferred
11006 until resolution time. */
11008 if (!sym->attr.dummy
11009 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
11011 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
11015 if (sym->attr.value && !sym->attr.dummy)
11017 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
11018 "it is not a dummy argument", sym->name, &sym->declared_at);
11022 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
11024 gfc_charlen *cl = sym->ts.u.cl;
11025 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
11027 gfc_error ("Character dummy variable '%s' at %L with VALUE "
11028 "attribute must have constant length",
11029 sym->name, &sym->declared_at);
11033 if (sym->ts.is_c_interop
11034 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
11036 gfc_error ("C interoperable character dummy variable '%s' at %L "
11037 "with VALUE attribute must have length one",
11038 sym->name, &sym->declared_at);
11043 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
11044 do this for something that was implicitly typed because that is handled
11045 in gfc_set_default_type. Handle dummy arguments and procedure
11046 definitions separately. Also, anything that is use associated is not
11047 handled here but instead is handled in the module it is declared in.
11048 Finally, derived type definitions are allowed to be BIND(C) since that
11049 only implies that they're interoperable, and they are checked fully for
11050 interoperability when a variable is declared of that type. */
11051 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
11052 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
11053 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
11055 gfc_try t = SUCCESS;
11057 /* First, make sure the variable is declared at the
11058 module-level scope (J3/04-007, Section 15.3). */
11059 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
11060 sym->attr.in_common == 0)
11062 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
11063 "is neither a COMMON block nor declared at the "
11064 "module level scope", sym->name, &(sym->declared_at));
11067 else if (sym->common_head != NULL)
11069 t = verify_com_block_vars_c_interop (sym->common_head);
11073 /* If type() declaration, we need to verify that the components
11074 of the given type are all C interoperable, etc. */
11075 if (sym->ts.type == BT_DERIVED &&
11076 sym->ts.u.derived->attr.is_c_interop != 1)
11078 /* Make sure the user marked the derived type as BIND(C). If
11079 not, call the verify routine. This could print an error
11080 for the derived type more than once if multiple variables
11081 of that type are declared. */
11082 if (sym->ts.u.derived->attr.is_bind_c != 1)
11083 verify_bind_c_derived_type (sym->ts.u.derived);
11087 /* Verify the variable itself as C interoperable if it
11088 is BIND(C). It is not possible for this to succeed if
11089 the verify_bind_c_derived_type failed, so don't have to handle
11090 any error returned by verify_bind_c_derived_type. */
11091 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
11092 sym->common_block);
11097 /* clear the is_bind_c flag to prevent reporting errors more than
11098 once if something failed. */
11099 sym->attr.is_bind_c = 0;
11104 /* If a derived type symbol has reached this point, without its
11105 type being declared, we have an error. Notice that most
11106 conditions that produce undefined derived types have already
11107 been dealt with. However, the likes of:
11108 implicit type(t) (t) ..... call foo (t) will get us here if
11109 the type is not declared in the scope of the implicit
11110 statement. Change the type to BT_UNKNOWN, both because it is so
11111 and to prevent an ICE. */
11112 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
11113 && !sym->ts.u.derived->attr.zero_comp)
11115 gfc_error ("The derived type '%s' at %L is of type '%s', "
11116 "which has not been defined", sym->name,
11117 &sym->declared_at, sym->ts.u.derived->name);
11118 sym->ts.type = BT_UNKNOWN;
11122 /* Make sure that the derived type has been resolved and that the
11123 derived type is visible in the symbol's namespace, if it is a
11124 module function and is not PRIVATE. */
11125 if (sym->ts.type == BT_DERIVED
11126 && sym->ts.u.derived->attr.use_assoc
11127 && sym->ns->proc_name
11128 && sym->ns->proc_name->attr.flavor == FL_MODULE)
11132 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
11135 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
11136 if (!ds && sym->attr.function
11137 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11139 symtree = gfc_new_symtree (&sym->ns->sym_root,
11140 sym->ts.u.derived->name);
11141 symtree->n.sym = sym->ts.u.derived;
11142 sym->ts.u.derived->refs++;
11146 /* Unless the derived-type declaration is use associated, Fortran 95
11147 does not allow public entries of private derived types.
11148 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
11149 161 in 95-006r3. */
11150 if (sym->ts.type == BT_DERIVED
11151 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
11152 && !sym->ts.u.derived->attr.use_assoc
11153 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11154 && !gfc_check_access (sym->ts.u.derived->attr.access,
11155 sym->ts.u.derived->ns->default_access)
11156 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
11157 "of PRIVATE derived type '%s'",
11158 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
11159 : "variable", sym->name, &sym->declared_at,
11160 sym->ts.u.derived->name) == FAILURE)
11163 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
11164 default initialization is defined (5.1.2.4.4). */
11165 if (sym->ts.type == BT_DERIVED
11167 && sym->attr.intent == INTENT_OUT
11169 && sym->as->type == AS_ASSUMED_SIZE)
11171 for (c = sym->ts.u.derived->components; c; c = c->next)
11173 if (c->initializer)
11175 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
11176 "ASSUMED SIZE and so cannot have a default initializer",
11177 sym->name, &sym->declared_at);
11183 switch (sym->attr.flavor)
11186 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
11191 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
11196 if (resolve_fl_namelist (sym) == FAILURE)
11201 if (resolve_fl_parameter (sym) == FAILURE)
11209 /* Resolve array specifier. Check as well some constraints
11210 on COMMON blocks. */
11212 check_constant = sym->attr.in_common && !sym->attr.pointer;
11214 /* Set the formal_arg_flag so that check_conflict will not throw
11215 an error for host associated variables in the specification
11216 expression for an array_valued function. */
11217 if (sym->attr.function && sym->as)
11218 formal_arg_flag = 1;
11220 gfc_resolve_array_spec (sym->as, check_constant);
11222 formal_arg_flag = 0;
11224 /* Resolve formal namespaces. */
11225 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11226 && !sym->attr.contained && !sym->attr.intrinsic)
11227 gfc_resolve (sym->formal_ns);
11229 /* Make sure the formal namespace is present. */
11230 if (sym->formal && !sym->formal_ns)
11232 gfc_formal_arglist *formal = sym->formal;
11233 while (formal && !formal->sym)
11234 formal = formal->next;
11238 sym->formal_ns = formal->sym->ns;
11239 sym->formal_ns->refs++;
11243 /* Check threadprivate restrictions. */
11244 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11245 && (!sym->attr.in_common
11246 && sym->module == NULL
11247 && (sym->ns->proc_name == NULL
11248 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11249 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11251 /* If we have come this far we can apply default-initializers, as
11252 described in 14.7.5, to those variables that have not already
11253 been assigned one. */
11254 if (sym->ts.type == BT_DERIVED
11255 && sym->attr.referenced
11256 && sym->ns == gfc_current_ns
11258 && !sym->attr.allocatable
11259 && !sym->attr.alloc_comp)
11261 symbol_attribute *a = &sym->attr;
11263 if ((!a->save && !a->dummy && !a->pointer
11264 && !a->in_common && !a->use_assoc
11265 && !(a->function && sym != sym->result))
11266 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11267 apply_default_init (sym);
11270 /* If this symbol has a type-spec, check it. */
11271 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11272 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11273 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11279 /************* Resolve DATA statements *************/
11283 gfc_data_value *vnode;
11289 /* Advance the values structure to point to the next value in the data list. */
11292 next_data_value (void)
11294 while (mpz_cmp_ui (values.left, 0) == 0)
11297 if (values.vnode->next == NULL)
11300 values.vnode = values.vnode->next;
11301 mpz_set (values.left, values.vnode->repeat);
11309 check_data_variable (gfc_data_variable *var, locus *where)
11315 ar_type mark = AR_UNKNOWN;
11317 mpz_t section_index[GFC_MAX_DIMENSIONS];
11323 if (gfc_resolve_expr (var->expr) == FAILURE)
11327 mpz_init_set_si (offset, 0);
11330 if (e->expr_type != EXPR_VARIABLE)
11331 gfc_internal_error ("check_data_variable(): Bad expression");
11333 sym = e->symtree->n.sym;
11335 if (sym->ns->is_block_data && !sym->attr.in_common)
11337 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11338 sym->name, &sym->declared_at);
11341 if (e->ref == NULL && sym->as)
11343 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11344 " declaration", sym->name, where);
11348 has_pointer = sym->attr.pointer;
11350 for (ref = e->ref; ref; ref = ref->next)
11352 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11356 && ref->type == REF_ARRAY
11357 && ref->u.ar.type != AR_FULL)
11359 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11360 "be a full array", sym->name, where);
11365 if (e->rank == 0 || has_pointer)
11367 mpz_init_set_ui (size, 1);
11374 /* Find the array section reference. */
11375 for (ref = e->ref; ref; ref = ref->next)
11377 if (ref->type != REF_ARRAY)
11379 if (ref->u.ar.type == AR_ELEMENT)
11385 /* Set marks according to the reference pattern. */
11386 switch (ref->u.ar.type)
11394 /* Get the start position of array section. */
11395 gfc_get_section_index (ar, section_index, &offset);
11400 gcc_unreachable ();
11403 if (gfc_array_size (e, &size) == FAILURE)
11405 gfc_error ("Nonconstant array section at %L in DATA statement",
11407 mpz_clear (offset);
11414 while (mpz_cmp_ui (size, 0) > 0)
11416 if (next_data_value () == FAILURE)
11418 gfc_error ("DATA statement at %L has more variables than values",
11424 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
11428 /* If we have more than one element left in the repeat count,
11429 and we have more than one element left in the target variable,
11430 then create a range assignment. */
11431 /* FIXME: Only done for full arrays for now, since array sections
11433 if (mark == AR_FULL && ref && ref->next == NULL
11434 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
11438 if (mpz_cmp (size, values.left) >= 0)
11440 mpz_init_set (range, values.left);
11441 mpz_sub (size, size, values.left);
11442 mpz_set_ui (values.left, 0);
11446 mpz_init_set (range, size);
11447 mpz_sub (values.left, values.left, size);
11448 mpz_set_ui (size, 0);
11451 gfc_assign_data_value_range (var->expr, values.vnode->expr,
11454 mpz_add (offset, offset, range);
11458 /* Assign initial value to symbol. */
11461 mpz_sub_ui (values.left, values.left, 1);
11462 mpz_sub_ui (size, size, 1);
11464 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
11468 if (mark == AR_FULL)
11469 mpz_add_ui (offset, offset, 1);
11471 /* Modify the array section indexes and recalculate the offset
11472 for next element. */
11473 else if (mark == AR_SECTION)
11474 gfc_advance_section (section_index, ar, &offset);
11478 if (mark == AR_SECTION)
11480 for (i = 0; i < ar->dimen; i++)
11481 mpz_clear (section_index[i]);
11485 mpz_clear (offset);
11491 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
11493 /* Iterate over a list of elements in a DATA statement. */
11496 traverse_data_list (gfc_data_variable *var, locus *where)
11499 iterator_stack frame;
11500 gfc_expr *e, *start, *end, *step;
11501 gfc_try retval = SUCCESS;
11503 mpz_init (frame.value);
11505 start = gfc_copy_expr (var->iter.start);
11506 end = gfc_copy_expr (var->iter.end);
11507 step = gfc_copy_expr (var->iter.step);
11509 if (gfc_simplify_expr (start, 1) == FAILURE
11510 || start->expr_type != EXPR_CONSTANT)
11512 gfc_error ("iterator start at %L does not simplify", &start->where);
11516 if (gfc_simplify_expr (end, 1) == FAILURE
11517 || end->expr_type != EXPR_CONSTANT)
11519 gfc_error ("iterator end at %L does not simplify", &end->where);
11523 if (gfc_simplify_expr (step, 1) == FAILURE
11524 || step->expr_type != EXPR_CONSTANT)
11526 gfc_error ("iterator step at %L does not simplify", &step->where);
11531 mpz_init_set (trip, end->value.integer);
11532 mpz_sub (trip, trip, start->value.integer);
11533 mpz_add (trip, trip, step->value.integer);
11535 mpz_div (trip, trip, step->value.integer);
11537 mpz_set (frame.value, start->value.integer);
11539 frame.prev = iter_stack;
11540 frame.variable = var->iter.var->symtree;
11541 iter_stack = &frame;
11543 while (mpz_cmp_ui (trip, 0) > 0)
11545 if (traverse_data_var (var->list, where) == FAILURE)
11552 e = gfc_copy_expr (var->expr);
11553 if (gfc_simplify_expr (e, 1) == FAILURE)
11561 mpz_add (frame.value, frame.value, step->value.integer);
11563 mpz_sub_ui (trip, trip, 1);
11568 mpz_clear (frame.value);
11570 gfc_free_expr (start);
11571 gfc_free_expr (end);
11572 gfc_free_expr (step);
11574 iter_stack = frame.prev;
11579 /* Type resolve variables in the variable list of a DATA statement. */
11582 traverse_data_var (gfc_data_variable *var, locus *where)
11586 for (; var; var = var->next)
11588 if (var->expr == NULL)
11589 t = traverse_data_list (var, where);
11591 t = check_data_variable (var, where);
11601 /* Resolve the expressions and iterators associated with a data statement.
11602 This is separate from the assignment checking because data lists should
11603 only be resolved once. */
11606 resolve_data_variables (gfc_data_variable *d)
11608 for (; d; d = d->next)
11610 if (d->list == NULL)
11612 if (gfc_resolve_expr (d->expr) == FAILURE)
11617 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
11620 if (resolve_data_variables (d->list) == FAILURE)
11629 /* Resolve a single DATA statement. We implement this by storing a pointer to
11630 the value list into static variables, and then recursively traversing the
11631 variables list, expanding iterators and such. */
11634 resolve_data (gfc_data *d)
11637 if (resolve_data_variables (d->var) == FAILURE)
11640 values.vnode = d->value;
11641 if (d->value == NULL)
11642 mpz_set_ui (values.left, 0);
11644 mpz_set (values.left, d->value->repeat);
11646 if (traverse_data_var (d->var, &d->where) == FAILURE)
11649 /* At this point, we better not have any values left. */
11651 if (next_data_value () == SUCCESS)
11652 gfc_error ("DATA statement at %L has more values than variables",
11657 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
11658 accessed by host or use association, is a dummy argument to a pure function,
11659 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
11660 is storage associated with any such variable, shall not be used in the
11661 following contexts: (clients of this function). */
11663 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
11664 procedure. Returns zero if assignment is OK, nonzero if there is a
11667 gfc_impure_variable (gfc_symbol *sym)
11671 if (sym->attr.use_assoc || sym->attr.in_common)
11674 if (sym->ns != gfc_current_ns)
11675 return !sym->attr.function;
11677 proc = sym->ns->proc_name;
11678 if (sym->attr.dummy && gfc_pure (proc)
11679 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
11681 proc->attr.function))
11684 /* TODO: Sort out what can be storage associated, if anything, and include
11685 it here. In principle equivalences should be scanned but it does not
11686 seem to be possible to storage associate an impure variable this way. */
11691 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
11692 symbol of the current procedure. */
11695 gfc_pure (gfc_symbol *sym)
11697 symbol_attribute attr;
11700 sym = gfc_current_ns->proc_name;
11706 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
11710 /* Test whether the current procedure is elemental or not. */
11713 gfc_elemental (gfc_symbol *sym)
11715 symbol_attribute attr;
11718 sym = gfc_current_ns->proc_name;
11723 return attr.flavor == FL_PROCEDURE && attr.elemental;
11727 /* Warn about unused labels. */
11730 warn_unused_fortran_label (gfc_st_label *label)
11735 warn_unused_fortran_label (label->left);
11737 if (label->defined == ST_LABEL_UNKNOWN)
11740 switch (label->referenced)
11742 case ST_LABEL_UNKNOWN:
11743 gfc_warning ("Label %d at %L defined but not used", label->value,
11747 case ST_LABEL_BAD_TARGET:
11748 gfc_warning ("Label %d at %L defined but cannot be used",
11749 label->value, &label->where);
11756 warn_unused_fortran_label (label->right);
11760 /* Returns the sequence type of a symbol or sequence. */
11763 sequence_type (gfc_typespec ts)
11772 if (ts.u.derived->components == NULL)
11773 return SEQ_NONDEFAULT;
11775 result = sequence_type (ts.u.derived->components->ts);
11776 for (c = ts.u.derived->components->next; c; c = c->next)
11777 if (sequence_type (c->ts) != result)
11783 if (ts.kind != gfc_default_character_kind)
11784 return SEQ_NONDEFAULT;
11786 return SEQ_CHARACTER;
11789 if (ts.kind != gfc_default_integer_kind)
11790 return SEQ_NONDEFAULT;
11792 return SEQ_NUMERIC;
11795 if (!(ts.kind == gfc_default_real_kind
11796 || ts.kind == gfc_default_double_kind))
11797 return SEQ_NONDEFAULT;
11799 return SEQ_NUMERIC;
11802 if (ts.kind != gfc_default_complex_kind)
11803 return SEQ_NONDEFAULT;
11805 return SEQ_NUMERIC;
11808 if (ts.kind != gfc_default_logical_kind)
11809 return SEQ_NONDEFAULT;
11811 return SEQ_NUMERIC;
11814 return SEQ_NONDEFAULT;
11819 /* Resolve derived type EQUIVALENCE object. */
11822 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
11824 gfc_component *c = derived->components;
11829 /* Shall not be an object of nonsequence derived type. */
11830 if (!derived->attr.sequence)
11832 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
11833 "attribute to be an EQUIVALENCE object", sym->name,
11838 /* Shall not have allocatable components. */
11839 if (derived->attr.alloc_comp)
11841 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
11842 "components to be an EQUIVALENCE object",sym->name,
11847 if (sym->attr.in_common && has_default_initializer (sym->ts.u.derived))
11849 gfc_error ("Derived type variable '%s' at %L with default "
11850 "initialization cannot be in EQUIVALENCE with a variable "
11851 "in COMMON", sym->name, &e->where);
11855 for (; c ; c = c->next)
11857 if (c->ts.type == BT_DERIVED
11858 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
11861 /* Shall not be an object of sequence derived type containing a pointer
11862 in the structure. */
11863 if (c->attr.pointer)
11865 gfc_error ("Derived type variable '%s' at %L with pointer "
11866 "component(s) cannot be an EQUIVALENCE object",
11867 sym->name, &e->where);
11875 /* Resolve equivalence object.
11876 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
11877 an allocatable array, an object of nonsequence derived type, an object of
11878 sequence derived type containing a pointer at any level of component
11879 selection, an automatic object, a function name, an entry name, a result
11880 name, a named constant, a structure component, or a subobject of any of
11881 the preceding objects. A substring shall not have length zero. A
11882 derived type shall not have components with default initialization nor
11883 shall two objects of an equivalence group be initialized.
11884 Either all or none of the objects shall have an protected attribute.
11885 The simple constraints are done in symbol.c(check_conflict) and the rest
11886 are implemented here. */
11889 resolve_equivalence (gfc_equiv *eq)
11892 gfc_symbol *first_sym;
11895 locus *last_where = NULL;
11896 seq_type eq_type, last_eq_type;
11897 gfc_typespec *last_ts;
11898 int object, cnt_protected;
11901 last_ts = &eq->expr->symtree->n.sym->ts;
11903 first_sym = eq->expr->symtree->n.sym;
11907 for (object = 1; eq; eq = eq->eq, object++)
11911 e->ts = e->symtree->n.sym->ts;
11912 /* match_varspec might not know yet if it is seeing
11913 array reference or substring reference, as it doesn't
11915 if (e->ref && e->ref->type == REF_ARRAY)
11917 gfc_ref *ref = e->ref;
11918 sym = e->symtree->n.sym;
11920 if (sym->attr.dimension)
11922 ref->u.ar.as = sym->as;
11926 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
11927 if (e->ts.type == BT_CHARACTER
11929 && ref->type == REF_ARRAY
11930 && ref->u.ar.dimen == 1
11931 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
11932 && ref->u.ar.stride[0] == NULL)
11934 gfc_expr *start = ref->u.ar.start[0];
11935 gfc_expr *end = ref->u.ar.end[0];
11938 /* Optimize away the (:) reference. */
11939 if (start == NULL && end == NULL)
11942 e->ref = ref->next;
11944 e->ref->next = ref->next;
11949 ref->type = REF_SUBSTRING;
11951 start = gfc_int_expr (1);
11952 ref->u.ss.start = start;
11953 if (end == NULL && e->ts.u.cl)
11954 end = gfc_copy_expr (e->ts.u.cl->length);
11955 ref->u.ss.end = end;
11956 ref->u.ss.length = e->ts.u.cl;
11963 /* Any further ref is an error. */
11966 gcc_assert (ref->type == REF_ARRAY);
11967 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
11973 if (gfc_resolve_expr (e) == FAILURE)
11976 sym = e->symtree->n.sym;
11978 if (sym->attr.is_protected)
11980 if (cnt_protected > 0 && cnt_protected != object)
11982 gfc_error ("Either all or none of the objects in the "
11983 "EQUIVALENCE set at %L shall have the "
11984 "PROTECTED attribute",
11989 /* Shall not equivalence common block variables in a PURE procedure. */
11990 if (sym->ns->proc_name
11991 && sym->ns->proc_name->attr.pure
11992 && sym->attr.in_common)
11994 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
11995 "object in the pure procedure '%s'",
11996 sym->name, &e->where, sym->ns->proc_name->name);
12000 /* Shall not be a named constant. */
12001 if (e->expr_type == EXPR_CONSTANT)
12003 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
12004 "object", sym->name, &e->where);
12008 if (e->ts.type == BT_DERIVED
12009 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
12012 /* Check that the types correspond correctly:
12014 A numeric sequence structure may be equivalenced to another sequence
12015 structure, an object of default integer type, default real type, double
12016 precision real type, default logical type such that components of the
12017 structure ultimately only become associated to objects of the same
12018 kind. A character sequence structure may be equivalenced to an object
12019 of default character kind or another character sequence structure.
12020 Other objects may be equivalenced only to objects of the same type and
12021 kind parameters. */
12023 /* Identical types are unconditionally OK. */
12024 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
12025 goto identical_types;
12027 last_eq_type = sequence_type (*last_ts);
12028 eq_type = sequence_type (sym->ts);
12030 /* Since the pair of objects is not of the same type, mixed or
12031 non-default sequences can be rejected. */
12033 msg = "Sequence %s with mixed components in EQUIVALENCE "
12034 "statement at %L with different type objects";
12036 && last_eq_type == SEQ_MIXED
12037 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
12039 || (eq_type == SEQ_MIXED
12040 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12041 &e->where) == FAILURE))
12044 msg = "Non-default type object or sequence %s in EQUIVALENCE "
12045 "statement at %L with objects of different type";
12047 && last_eq_type == SEQ_NONDEFAULT
12048 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
12049 last_where) == FAILURE)
12050 || (eq_type == SEQ_NONDEFAULT
12051 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12052 &e->where) == FAILURE))
12055 msg ="Non-CHARACTER object '%s' in default CHARACTER "
12056 "EQUIVALENCE statement at %L";
12057 if (last_eq_type == SEQ_CHARACTER
12058 && eq_type != SEQ_CHARACTER
12059 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12060 &e->where) == FAILURE)
12063 msg ="Non-NUMERIC object '%s' in default NUMERIC "
12064 "EQUIVALENCE statement at %L";
12065 if (last_eq_type == SEQ_NUMERIC
12066 && eq_type != SEQ_NUMERIC
12067 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12068 &e->where) == FAILURE)
12073 last_where = &e->where;
12078 /* Shall not be an automatic array. */
12079 if (e->ref->type == REF_ARRAY
12080 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
12082 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
12083 "an EQUIVALENCE object", sym->name, &e->where);
12090 /* Shall not be a structure component. */
12091 if (r->type == REF_COMPONENT)
12093 gfc_error ("Structure component '%s' at %L cannot be an "
12094 "EQUIVALENCE object",
12095 r->u.c.component->name, &e->where);
12099 /* A substring shall not have length zero. */
12100 if (r->type == REF_SUBSTRING)
12102 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
12104 gfc_error ("Substring at %L has length zero",
12105 &r->u.ss.start->where);
12115 /* Resolve function and ENTRY types, issue diagnostics if needed. */
12118 resolve_fntype (gfc_namespace *ns)
12120 gfc_entry_list *el;
12123 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
12126 /* If there are any entries, ns->proc_name is the entry master
12127 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
12129 sym = ns->entries->sym;
12131 sym = ns->proc_name;
12132 if (sym->result == sym
12133 && sym->ts.type == BT_UNKNOWN
12134 && gfc_set_default_type (sym, 0, NULL) == FAILURE
12135 && !sym->attr.untyped)
12137 gfc_error ("Function '%s' at %L has no IMPLICIT type",
12138 sym->name, &sym->declared_at);
12139 sym->attr.untyped = 1;
12142 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
12143 && !sym->attr.contained
12144 && !gfc_check_access (sym->ts.u.derived->attr.access,
12145 sym->ts.u.derived->ns->default_access)
12146 && gfc_check_access (sym->attr.access, sym->ns->default_access))
12148 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
12149 "%L of PRIVATE type '%s'", sym->name,
12150 &sym->declared_at, sym->ts.u.derived->name);
12154 for (el = ns->entries->next; el; el = el->next)
12156 if (el->sym->result == el->sym
12157 && el->sym->ts.type == BT_UNKNOWN
12158 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
12159 && !el->sym->attr.untyped)
12161 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
12162 el->sym->name, &el->sym->declared_at);
12163 el->sym->attr.untyped = 1;
12169 /* 12.3.2.1.1 Defined operators. */
12172 check_uop_procedure (gfc_symbol *sym, locus where)
12174 gfc_formal_arglist *formal;
12176 if (!sym->attr.function)
12178 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
12179 sym->name, &where);
12183 if (sym->ts.type == BT_CHARACTER
12184 && !(sym->ts.u.cl && sym->ts.u.cl->length)
12185 && !(sym->result && sym->result->ts.u.cl
12186 && sym->result->ts.u.cl->length))
12188 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
12189 "character length", sym->name, &where);
12193 formal = sym->formal;
12194 if (!formal || !formal->sym)
12196 gfc_error ("User operator procedure '%s' at %L must have at least "
12197 "one argument", sym->name, &where);
12201 if (formal->sym->attr.intent != INTENT_IN)
12203 gfc_error ("First argument of operator interface at %L must be "
12204 "INTENT(IN)", &where);
12208 if (formal->sym->attr.optional)
12210 gfc_error ("First argument of operator interface at %L cannot be "
12211 "optional", &where);
12215 formal = formal->next;
12216 if (!formal || !formal->sym)
12219 if (formal->sym->attr.intent != INTENT_IN)
12221 gfc_error ("Second argument of operator interface at %L must be "
12222 "INTENT(IN)", &where);
12226 if (formal->sym->attr.optional)
12228 gfc_error ("Second argument of operator interface at %L cannot be "
12229 "optional", &where);
12235 gfc_error ("Operator interface at %L must have, at most, two "
12236 "arguments", &where);
12244 gfc_resolve_uops (gfc_symtree *symtree)
12246 gfc_interface *itr;
12248 if (symtree == NULL)
12251 gfc_resolve_uops (symtree->left);
12252 gfc_resolve_uops (symtree->right);
12254 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12255 check_uop_procedure (itr->sym, itr->sym->declared_at);
12259 /* Examine all of the expressions associated with a program unit,
12260 assign types to all intermediate expressions, make sure that all
12261 assignments are to compatible types and figure out which names
12262 refer to which functions or subroutines. It doesn't check code
12263 block, which is handled by resolve_code. */
12266 resolve_types (gfc_namespace *ns)
12272 gfc_namespace* old_ns = gfc_current_ns;
12274 /* Check that all IMPLICIT types are ok. */
12275 if (!ns->seen_implicit_none)
12278 for (letter = 0; letter != GFC_LETTERS; ++letter)
12279 if (ns->set_flag[letter]
12280 && resolve_typespec_used (&ns->default_type[letter],
12281 &ns->implicit_loc[letter],
12286 gfc_current_ns = ns;
12288 resolve_entries (ns);
12290 resolve_common_vars (ns->blank_common.head, false);
12291 resolve_common_blocks (ns->common_root);
12293 resolve_contained_functions (ns);
12295 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12297 for (cl = ns->cl_list; cl; cl = cl->next)
12298 resolve_charlen (cl);
12300 gfc_traverse_ns (ns, resolve_symbol);
12302 resolve_fntype (ns);
12304 for (n = ns->contained; n; n = n->sibling)
12306 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12307 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12308 "also be PURE", n->proc_name->name,
12309 &n->proc_name->declared_at);
12315 gfc_check_interfaces (ns);
12317 gfc_traverse_ns (ns, resolve_values);
12323 for (d = ns->data; d; d = d->next)
12327 gfc_traverse_ns (ns, gfc_formalize_init_value);
12329 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12331 if (ns->common_root != NULL)
12332 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12334 for (eq = ns->equiv; eq; eq = eq->next)
12335 resolve_equivalence (eq);
12337 /* Warn about unused labels. */
12338 if (warn_unused_label)
12339 warn_unused_fortran_label (ns->st_labels);
12341 gfc_resolve_uops (ns->uop_root);
12343 gfc_current_ns = old_ns;
12347 /* Call resolve_code recursively. */
12350 resolve_codes (gfc_namespace *ns)
12353 bitmap_obstack old_obstack;
12355 for (n = ns->contained; n; n = n->sibling)
12358 gfc_current_ns = ns;
12360 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
12361 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
12364 /* Set to an out of range value. */
12365 current_entry_id = -1;
12367 old_obstack = labels_obstack;
12368 bitmap_obstack_initialize (&labels_obstack);
12370 resolve_code (ns->code, ns);
12372 bitmap_obstack_release (&labels_obstack);
12373 labels_obstack = old_obstack;
12377 /* This function is called after a complete program unit has been compiled.
12378 Its purpose is to examine all of the expressions associated with a program
12379 unit, assign types to all intermediate expressions, make sure that all
12380 assignments are to compatible types and figure out which names refer to
12381 which functions or subroutines. */
12384 gfc_resolve (gfc_namespace *ns)
12386 gfc_namespace *old_ns;
12387 code_stack *old_cs_base;
12393 old_ns = gfc_current_ns;
12394 old_cs_base = cs_base;
12396 resolve_types (ns);
12397 resolve_codes (ns);
12399 gfc_current_ns = old_ns;
12400 cs_base = old_cs_base;