1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
28 #include "arith.h" /* For gfc_compare_expr(). */
29 #include "dependency.h"
31 #include "target-memory.h" /* for gfc_simplify_transfer */
33 /* Types used in equivalence statements. */
37 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
41 /* Stack to keep track of the nesting of blocks as we move through the
42 code. See resolve_branch() and resolve_code(). */
44 typedef struct code_stack
46 struct gfc_code *head, *current;
47 struct code_stack *prev;
49 /* This bitmap keeps track of the targets valid for a branch from
50 inside this block except for END {IF|SELECT}s of enclosing
52 bitmap reachable_labels;
56 static code_stack *cs_base = NULL;
59 /* Nonzero if we're inside a FORALL block. */
61 static int forall_flag;
63 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
65 static int omp_workshare_flag;
67 /* Nonzero if we are processing a formal arglist. The corresponding function
68 resets the flag each time that it is read. */
69 static int formal_arg_flag = 0;
71 /* True if we are resolving a specification expression. */
72 static int specification_expr = 0;
74 /* The id of the last entry seen. */
75 static int current_entry_id;
77 /* We use bitmaps to determine if a branch target is valid. */
78 static bitmap_obstack labels_obstack;
81 gfc_is_formal_arg (void)
83 return formal_arg_flag;
86 /* Is the symbol host associated? */
88 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
90 for (ns = ns->parent; ns; ns = ns->parent)
99 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
100 an ABSTRACT derived-type. If where is not NULL, an error message with that
101 locus is printed, optionally using name. */
104 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
106 if (ts->type == BT_DERIVED && ts->u.derived->attr.abstract)
111 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
112 name, where, ts->u.derived->name);
114 gfc_error ("ABSTRACT type '%s' used at %L",
115 ts->u.derived->name, where);
125 /* Resolve types of formal argument lists. These have to be done early so that
126 the formal argument lists of module procedures can be copied to the
127 containing module before the individual procedures are resolved
128 individually. We also resolve argument lists of procedures in interface
129 blocks because they are self-contained scoping units.
131 Since a dummy argument cannot be a non-dummy procedure, the only
132 resort left for untyped names are the IMPLICIT types. */
135 resolve_formal_arglist (gfc_symbol *proc)
137 gfc_formal_arglist *f;
141 if (proc->result != NULL)
146 if (gfc_elemental (proc)
147 || sym->attr.pointer || sym->attr.allocatable
148 || (sym->as && sym->as->rank > 0))
150 proc->attr.always_explicit = 1;
151 sym->attr.always_explicit = 1;
156 for (f = proc->formal; f; f = f->next)
162 /* Alternate return placeholder. */
163 if (gfc_elemental (proc))
164 gfc_error ("Alternate return specifier in elemental subroutine "
165 "'%s' at %L is not allowed", proc->name,
167 if (proc->attr.function)
168 gfc_error ("Alternate return specifier in function "
169 "'%s' at %L is not allowed", proc->name,
174 if (sym->attr.if_source != IFSRC_UNKNOWN)
175 resolve_formal_arglist (sym);
177 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
179 if (gfc_pure (proc) && !gfc_pure (sym))
181 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
182 "also be PURE", sym->name, &sym->declared_at);
186 if (gfc_elemental (proc))
188 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
189 "procedure", &sym->declared_at);
193 if (sym->attr.function
194 && sym->ts.type == BT_UNKNOWN
195 && sym->attr.intrinsic)
197 gfc_intrinsic_sym *isym;
198 isym = gfc_find_function (sym->name);
199 if (isym == NULL || !isym->specific)
201 gfc_error ("Unable to find a specific INTRINSIC procedure "
202 "for the reference '%s' at %L", sym->name,
211 if (sym->ts.type == BT_UNKNOWN)
213 if (!sym->attr.function || sym->result == sym)
214 gfc_set_default_type (sym, 1, sym->ns);
217 gfc_resolve_array_spec (sym->as, 0);
219 /* We can't tell if an array with dimension (:) is assumed or deferred
220 shape until we know if it has the pointer or allocatable attributes.
222 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
223 && !(sym->attr.pointer || sym->attr.allocatable))
225 sym->as->type = AS_ASSUMED_SHAPE;
226 for (i = 0; i < sym->as->rank; i++)
227 sym->as->lower[i] = gfc_int_expr (1);
230 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
231 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
232 || sym->attr.optional)
234 proc->attr.always_explicit = 1;
236 proc->result->attr.always_explicit = 1;
239 /* If the flavor is unknown at this point, it has to be a variable.
240 A procedure specification would have already set the type. */
242 if (sym->attr.flavor == FL_UNKNOWN)
243 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
245 if (gfc_pure (proc) && !sym->attr.pointer
246 && sym->attr.flavor != FL_PROCEDURE)
248 if (proc->attr.function && sym->attr.intent != INTENT_IN)
249 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
250 "INTENT(IN)", sym->name, proc->name,
253 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
254 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
255 "have its INTENT specified", sym->name, proc->name,
259 if (gfc_elemental (proc))
263 gfc_error ("Argument '%s' of elemental procedure at %L must "
264 "be scalar", sym->name, &sym->declared_at);
268 if (sym->attr.pointer)
270 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
271 "have the POINTER attribute", sym->name,
276 if (sym->attr.flavor == FL_PROCEDURE)
278 gfc_error ("Dummy procedure '%s' not allowed in elemental "
279 "procedure '%s' at %L", sym->name, proc->name,
285 /* Each dummy shall be specified to be scalar. */
286 if (proc->attr.proc == PROC_ST_FUNCTION)
290 gfc_error ("Argument '%s' of statement function at %L must "
291 "be scalar", sym->name, &sym->declared_at);
295 if (sym->ts.type == BT_CHARACTER)
297 gfc_charlen *cl = sym->ts.u.cl;
298 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
300 gfc_error ("Character-valued argument '%s' of statement "
301 "function at %L must have constant length",
302 sym->name, &sym->declared_at);
312 /* Work function called when searching for symbols that have argument lists
313 associated with them. */
316 find_arglists (gfc_symbol *sym)
318 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
321 resolve_formal_arglist (sym);
325 /* Given a namespace, resolve all formal argument lists within the namespace.
329 resolve_formal_arglists (gfc_namespace *ns)
334 gfc_traverse_ns (ns, find_arglists);
339 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
343 /* If this namespace is not a function or an entry master function,
345 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
346 || sym->attr.entry_master)
349 /* Try to find out of what the return type is. */
350 if (sym->result->ts.type == BT_UNKNOWN && sym->result->ts.interface == NULL)
352 t = gfc_set_default_type (sym->result, 0, ns);
354 if (t == FAILURE && !sym->result->attr.untyped)
356 if (sym->result == sym)
357 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
358 sym->name, &sym->declared_at);
359 else if (!sym->result->attr.proc_pointer)
360 gfc_error ("Result '%s' of contained function '%s' at %L has "
361 "no IMPLICIT type", sym->result->name, sym->name,
362 &sym->result->declared_at);
363 sym->result->attr.untyped = 1;
367 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
368 type, lists the only ways a character length value of * can be used:
369 dummy arguments of procedures, named constants, and function results
370 in external functions. Internal function results 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 ||(sym->attr.function && gfc_current_ns->proc_name == sym))
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 && cons->expr != NULL)
847 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
848 expr->ts.u.derived->name, &(expr->where));
852 for (; comp; comp = comp->next, cons = cons->next)
859 if (gfc_resolve_expr (cons->expr) == FAILURE)
865 rank = comp->as ? comp->as->rank : 0;
866 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
867 && (comp->attr.allocatable || cons->expr->rank))
869 gfc_error ("The rank of the element in the derived type "
870 "constructor at %L does not match that of the "
871 "component (%d/%d)", &cons->expr->where,
872 cons->expr->rank, rank);
876 /* If we don't have the right type, try to convert it. */
878 if (!gfc_compare_types (&cons->expr->ts, &comp->ts))
881 if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
882 gfc_error ("The element in the derived type constructor at %L, "
883 "for pointer component '%s', is %s but should be %s",
884 &cons->expr->where, comp->name,
885 gfc_basic_typename (cons->expr->ts.type),
886 gfc_basic_typename (comp->ts.type));
888 t = gfc_convert_type (cons->expr, &comp->ts, 1);
891 if (cons->expr->expr_type == EXPR_NULL
892 && !(comp->attr.pointer || comp->attr.allocatable
893 || comp->attr.proc_pointer
894 || (comp->ts.type == BT_CLASS
895 && (comp->ts.u.derived->components->attr.pointer
896 || comp->ts.u.derived->components->attr.allocatable))))
899 gfc_error ("The NULL in the derived type constructor at %L is "
900 "being applied to component '%s', which is neither "
901 "a POINTER nor ALLOCATABLE", &cons->expr->where,
905 if (!comp->attr.pointer || cons->expr->expr_type == EXPR_NULL)
908 a = gfc_expr_attr (cons->expr);
910 if (!a.pointer && !a.target)
913 gfc_error ("The element in the derived type constructor at %L, "
914 "for pointer component '%s' should be a POINTER or "
915 "a TARGET", &cons->expr->where, comp->name);
923 /****************** Expression name resolution ******************/
925 /* Returns 0 if a symbol was not declared with a type or
926 attribute declaration statement, nonzero otherwise. */
929 was_declared (gfc_symbol *sym)
935 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
938 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
939 || a.optional || a.pointer || a.save || a.target || a.volatile_
940 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN)
947 /* Determine if a symbol is generic or not. */
950 generic_sym (gfc_symbol *sym)
954 if (sym->attr.generic ||
955 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
958 if (was_declared (sym) || sym->ns->parent == NULL)
961 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
968 return generic_sym (s);
975 /* Determine if a symbol is specific or not. */
978 specific_sym (gfc_symbol *sym)
982 if (sym->attr.if_source == IFSRC_IFBODY
983 || sym->attr.proc == PROC_MODULE
984 || sym->attr.proc == PROC_INTERNAL
985 || sym->attr.proc == PROC_ST_FUNCTION
986 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
987 || sym->attr.external)
990 if (was_declared (sym) || sym->ns->parent == NULL)
993 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
995 return (s == NULL) ? 0 : specific_sym (s);
999 /* Figure out if the procedure is specific, generic or unknown. */
1002 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1006 procedure_kind (gfc_symbol *sym)
1008 if (generic_sym (sym))
1009 return PTYPE_GENERIC;
1011 if (specific_sym (sym))
1012 return PTYPE_SPECIFIC;
1014 return PTYPE_UNKNOWN;
1017 /* Check references to assumed size arrays. The flag need_full_assumed_size
1018 is nonzero when matching actual arguments. */
1020 static int need_full_assumed_size = 0;
1023 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1025 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1028 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1029 What should it be? */
1030 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1031 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1032 && (e->ref->u.ar.type == AR_FULL))
1034 gfc_error ("The upper bound in the last dimension must "
1035 "appear in the reference to the assumed size "
1036 "array '%s' at %L", sym->name, &e->where);
1043 /* Look for bad assumed size array references in argument expressions
1044 of elemental and array valued intrinsic procedures. Since this is
1045 called from procedure resolution functions, it only recurses at
1049 resolve_assumed_size_actual (gfc_expr *e)
1054 switch (e->expr_type)
1057 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1062 if (resolve_assumed_size_actual (e->value.op.op1)
1063 || resolve_assumed_size_actual (e->value.op.op2))
1074 /* Check a generic procedure, passed as an actual argument, to see if
1075 there is a matching specific name. If none, it is an error, and if
1076 more than one, the reference is ambiguous. */
1078 count_specific_procs (gfc_expr *e)
1085 sym = e->symtree->n.sym;
1087 for (p = sym->generic; p; p = p->next)
1088 if (strcmp (sym->name, p->sym->name) == 0)
1090 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1096 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1100 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1101 "argument at %L", sym->name, &e->where);
1107 /* See if a call to sym could possibly be a not allowed RECURSION because of
1108 a missing RECURIVE declaration. This means that either sym is the current
1109 context itself, or sym is the parent of a contained procedure calling its
1110 non-RECURSIVE containing procedure.
1111 This also works if sym is an ENTRY. */
1114 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1116 gfc_symbol* proc_sym;
1117 gfc_symbol* context_proc;
1118 gfc_namespace* real_context;
1120 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1122 /* If we've got an ENTRY, find real procedure. */
1123 if (sym->attr.entry && sym->ns->entries)
1124 proc_sym = sym->ns->entries->sym;
1128 /* If sym is RECURSIVE, all is well of course. */
1129 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1132 /* Find the context procedure's "real" symbol if it has entries.
1133 We look for a procedure symbol, so recurse on the parents if we don't
1134 find one (like in case of a BLOCK construct). */
1135 for (real_context = context; ; real_context = real_context->parent)
1137 /* We should find something, eventually! */
1138 gcc_assert (real_context);
1140 context_proc = (real_context->entries ? real_context->entries->sym
1141 : real_context->proc_name);
1143 /* In some special cases, there may not be a proc_name, like for this
1145 real(bad_kind()) function foo () ...
1146 when checking the call to bad_kind ().
1147 In these cases, we simply return here and assume that the
1152 if (context_proc->attr.flavor != FL_LABEL)
1156 /* A call from sym's body to itself is recursion, of course. */
1157 if (context_proc == proc_sym)
1160 /* The same is true if context is a contained procedure and sym the
1162 if (context_proc->attr.contained)
1164 gfc_symbol* parent_proc;
1166 gcc_assert (context->parent);
1167 parent_proc = (context->parent->entries ? context->parent->entries->sym
1168 : context->parent->proc_name);
1170 if (parent_proc == proc_sym)
1178 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1179 its typespec and formal argument list. */
1182 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1184 gfc_intrinsic_sym* isym;
1190 /* We already know this one is an intrinsic, so we don't call
1191 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1192 gfc_find_subroutine directly to check whether it is a function or
1195 if ((isym = gfc_find_function (sym->name)))
1197 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1198 && !sym->attr.implicit_type)
1199 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1200 " ignored", sym->name, &sym->declared_at);
1202 if (!sym->attr.function &&
1203 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1208 else if ((isym = gfc_find_subroutine (sym->name)))
1210 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1212 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1213 " specifier", sym->name, &sym->declared_at);
1217 if (!sym->attr.subroutine &&
1218 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1223 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1228 gfc_copy_formal_args_intr (sym, isym);
1230 /* Check it is actually available in the standard settings. */
1231 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1234 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1235 " available in the current standard settings but %s. Use"
1236 " an appropriate -std=* option or enable -fall-intrinsics"
1237 " in order to use it.",
1238 sym->name, &sym->declared_at, symstd);
1246 /* Resolve a procedure expression, like passing it to a called procedure or as
1247 RHS for a procedure pointer assignment. */
1250 resolve_procedure_expression (gfc_expr* expr)
1254 if (expr->expr_type != EXPR_VARIABLE)
1256 gcc_assert (expr->symtree);
1258 sym = expr->symtree->n.sym;
1260 if (sym->attr.intrinsic)
1261 resolve_intrinsic (sym, &expr->where);
1263 if (sym->attr.flavor != FL_PROCEDURE
1264 || (sym->attr.function && sym->result == sym))
1267 /* A non-RECURSIVE procedure that is used as procedure expression within its
1268 own body is in danger of being called recursively. */
1269 if (is_illegal_recursion (sym, gfc_current_ns))
1270 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1271 " itself recursively. Declare it RECURSIVE or use"
1272 " -frecursive", sym->name, &expr->where);
1278 /* Resolve an actual argument list. Most of the time, this is just
1279 resolving the expressions in the list.
1280 The exception is that we sometimes have to decide whether arguments
1281 that look like procedure arguments are really simple variable
1285 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1286 bool no_formal_args)
1289 gfc_symtree *parent_st;
1291 int save_need_full_assumed_size;
1292 gfc_component *comp;
1294 for (; arg; arg = arg->next)
1299 /* Check the label is a valid branching target. */
1302 if (arg->label->defined == ST_LABEL_UNKNOWN)
1304 gfc_error ("Label %d referenced at %L is never defined",
1305 arg->label->value, &arg->label->where);
1312 if (gfc_is_proc_ptr_comp (e, &comp))
1315 if (e->expr_type == EXPR_PPC)
1317 if (comp->as != NULL)
1318 e->rank = comp->as->rank;
1319 e->expr_type = EXPR_FUNCTION;
1324 if (e->expr_type == EXPR_VARIABLE
1325 && e->symtree->n.sym->attr.generic
1327 && count_specific_procs (e) != 1)
1330 if (e->ts.type != BT_PROCEDURE)
1332 save_need_full_assumed_size = need_full_assumed_size;
1333 if (e->expr_type != EXPR_VARIABLE)
1334 need_full_assumed_size = 0;
1335 if (gfc_resolve_expr (e) != SUCCESS)
1337 need_full_assumed_size = save_need_full_assumed_size;
1341 /* See if the expression node should really be a variable reference. */
1343 sym = e->symtree->n.sym;
1345 if (sym->attr.flavor == FL_PROCEDURE
1346 || sym->attr.intrinsic
1347 || sym->attr.external)
1351 /* If a procedure is not already determined to be something else
1352 check if it is intrinsic. */
1353 if (!sym->attr.intrinsic
1354 && !(sym->attr.external || sym->attr.use_assoc
1355 || sym->attr.if_source == IFSRC_IFBODY)
1356 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1357 sym->attr.intrinsic = 1;
1359 if (sym->attr.proc == PROC_ST_FUNCTION)
1361 gfc_error ("Statement function '%s' at %L is not allowed as an "
1362 "actual argument", sym->name, &e->where);
1365 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1366 sym->attr.subroutine);
1367 if (sym->attr.intrinsic && actual_ok == 0)
1369 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1370 "actual argument", sym->name, &e->where);
1373 if (sym->attr.contained && !sym->attr.use_assoc
1374 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1376 gfc_error ("Internal procedure '%s' is not allowed as an "
1377 "actual argument at %L", sym->name, &e->where);
1380 if (sym->attr.elemental && !sym->attr.intrinsic)
1382 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1383 "allowed as an actual argument at %L", sym->name,
1387 /* Check if a generic interface has a specific procedure
1388 with the same name before emitting an error. */
1389 if (sym->attr.generic && count_specific_procs (e) != 1)
1392 /* Just in case a specific was found for the expression. */
1393 sym = e->symtree->n.sym;
1395 /* If the symbol is the function that names the current (or
1396 parent) scope, then we really have a variable reference. */
1398 if (sym->attr.function && sym->result == sym
1399 && (sym->ns->proc_name == sym
1400 || (sym->ns->parent != NULL
1401 && sym->ns->parent->proc_name == sym)))
1404 /* If all else fails, see if we have a specific intrinsic. */
1405 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1407 gfc_intrinsic_sym *isym;
1409 isym = gfc_find_function (sym->name);
1410 if (isym == NULL || !isym->specific)
1412 gfc_error ("Unable to find a specific INTRINSIC procedure "
1413 "for the reference '%s' at %L", sym->name,
1418 sym->attr.intrinsic = 1;
1419 sym->attr.function = 1;
1422 if (gfc_resolve_expr (e) == FAILURE)
1427 /* See if the name is a module procedure in a parent unit. */
1429 if (was_declared (sym) || sym->ns->parent == NULL)
1432 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1434 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1438 if (parent_st == NULL)
1441 sym = parent_st->n.sym;
1442 e->symtree = parent_st; /* Point to the right thing. */
1444 if (sym->attr.flavor == FL_PROCEDURE
1445 || sym->attr.intrinsic
1446 || sym->attr.external)
1448 if (gfc_resolve_expr (e) == FAILURE)
1454 e->expr_type = EXPR_VARIABLE;
1456 if (sym->as != NULL)
1458 e->rank = sym->as->rank;
1459 e->ref = gfc_get_ref ();
1460 e->ref->type = REF_ARRAY;
1461 e->ref->u.ar.type = AR_FULL;
1462 e->ref->u.ar.as = sym->as;
1465 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1466 primary.c (match_actual_arg). If above code determines that it
1467 is a variable instead, it needs to be resolved as it was not
1468 done at the beginning of this function. */
1469 save_need_full_assumed_size = need_full_assumed_size;
1470 if (e->expr_type != EXPR_VARIABLE)
1471 need_full_assumed_size = 0;
1472 if (gfc_resolve_expr (e) != SUCCESS)
1474 need_full_assumed_size = save_need_full_assumed_size;
1477 /* Check argument list functions %VAL, %LOC and %REF. There is
1478 nothing to do for %REF. */
1479 if (arg->name && arg->name[0] == '%')
1481 if (strncmp ("%VAL", arg->name, 4) == 0)
1483 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1485 gfc_error ("By-value argument at %L is not of numeric "
1492 gfc_error ("By-value argument at %L cannot be an array or "
1493 "an array section", &e->where);
1497 /* Intrinsics are still PROC_UNKNOWN here. However,
1498 since same file external procedures are not resolvable
1499 in gfortran, it is a good deal easier to leave them to
1501 if (ptype != PROC_UNKNOWN
1502 && ptype != PROC_DUMMY
1503 && ptype != PROC_EXTERNAL
1504 && ptype != PROC_MODULE)
1506 gfc_error ("By-value argument at %L is not allowed "
1507 "in this context", &e->where);
1512 /* Statement functions have already been excluded above. */
1513 else if (strncmp ("%LOC", arg->name, 4) == 0
1514 && e->ts.type == BT_PROCEDURE)
1516 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1518 gfc_error ("Passing internal procedure at %L by location "
1519 "not allowed", &e->where);
1530 /* Do the checks of the actual argument list that are specific to elemental
1531 procedures. If called with c == NULL, we have a function, otherwise if
1532 expr == NULL, we have a subroutine. */
1535 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1537 gfc_actual_arglist *arg0;
1538 gfc_actual_arglist *arg;
1539 gfc_symbol *esym = NULL;
1540 gfc_intrinsic_sym *isym = NULL;
1542 gfc_intrinsic_arg *iformal = NULL;
1543 gfc_formal_arglist *eformal = NULL;
1544 bool formal_optional = false;
1545 bool set_by_optional = false;
1549 /* Is this an elemental procedure? */
1550 if (expr && expr->value.function.actual != NULL)
1552 if (expr->value.function.esym != NULL
1553 && expr->value.function.esym->attr.elemental)
1555 arg0 = expr->value.function.actual;
1556 esym = expr->value.function.esym;
1558 else if (expr->value.function.isym != NULL
1559 && expr->value.function.isym->elemental)
1561 arg0 = expr->value.function.actual;
1562 isym = expr->value.function.isym;
1567 else if (c && c->ext.actual != NULL)
1569 arg0 = c->ext.actual;
1571 if (c->resolved_sym)
1572 esym = c->resolved_sym;
1574 esym = c->symtree->n.sym;
1577 if (!esym->attr.elemental)
1583 /* The rank of an elemental is the rank of its array argument(s). */
1584 for (arg = arg0; arg; arg = arg->next)
1586 if (arg->expr != NULL && arg->expr->rank > 0)
1588 rank = arg->expr->rank;
1589 if (arg->expr->expr_type == EXPR_VARIABLE
1590 && arg->expr->symtree->n.sym->attr.optional)
1591 set_by_optional = true;
1593 /* Function specific; set the result rank and shape. */
1597 if (!expr->shape && arg->expr->shape)
1599 expr->shape = gfc_get_shape (rank);
1600 for (i = 0; i < rank; i++)
1601 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1608 /* If it is an array, it shall not be supplied as an actual argument
1609 to an elemental procedure unless an array of the same rank is supplied
1610 as an actual argument corresponding to a nonoptional dummy argument of
1611 that elemental procedure(12.4.1.5). */
1612 formal_optional = false;
1614 iformal = isym->formal;
1616 eformal = esym->formal;
1618 for (arg = arg0; arg; arg = arg->next)
1622 if (eformal->sym && eformal->sym->attr.optional)
1623 formal_optional = true;
1624 eformal = eformal->next;
1626 else if (isym && iformal)
1628 if (iformal->optional)
1629 formal_optional = true;
1630 iformal = iformal->next;
1633 formal_optional = true;
1635 if (pedantic && arg->expr != NULL
1636 && arg->expr->expr_type == EXPR_VARIABLE
1637 && arg->expr->symtree->n.sym->attr.optional
1640 && (set_by_optional || arg->expr->rank != rank)
1641 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1643 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1644 "MISSING, it cannot be the actual argument of an "
1645 "ELEMENTAL procedure unless there is a non-optional "
1646 "argument with the same rank (12.4.1.5)",
1647 arg->expr->symtree->n.sym->name, &arg->expr->where);
1652 for (arg = arg0; arg; arg = arg->next)
1654 if (arg->expr == NULL || arg->expr->rank == 0)
1657 /* Being elemental, the last upper bound of an assumed size array
1658 argument must be present. */
1659 if (resolve_assumed_size_actual (arg->expr))
1662 /* Elemental procedure's array actual arguments must conform. */
1665 if (gfc_check_conformance (arg->expr, e,
1666 "elemental procedure") == FAILURE)
1673 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1674 is an array, the intent inout/out variable needs to be also an array. */
1675 if (rank > 0 && esym && expr == NULL)
1676 for (eformal = esym->formal, arg = arg0; arg && eformal;
1677 arg = arg->next, eformal = eformal->next)
1678 if ((eformal->sym->attr.intent == INTENT_OUT
1679 || eformal->sym->attr.intent == INTENT_INOUT)
1680 && arg->expr && arg->expr->rank == 0)
1682 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1683 "ELEMENTAL subroutine '%s' is a scalar, but another "
1684 "actual argument is an array", &arg->expr->where,
1685 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1686 : "INOUT", eformal->sym->name, esym->name);
1693 /* Go through each actual argument in ACTUAL and see if it can be
1694 implemented as an inlined, non-copying intrinsic. FNSYM is the
1695 function being called, or NULL if not known. */
1698 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1700 gfc_actual_arglist *ap;
1703 for (ap = actual; ap; ap = ap->next)
1705 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1706 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1708 ap->expr->inline_noncopying_intrinsic = 1;
1712 /* This function does the checking of references to global procedures
1713 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1714 77 and 95 standards. It checks for a gsymbol for the name, making
1715 one if it does not already exist. If it already exists, then the
1716 reference being resolved must correspond to the type of gsymbol.
1717 Otherwise, the new symbol is equipped with the attributes of the
1718 reference. The corresponding code that is called in creating
1719 global entities is parse.c.
1721 In addition, for all but -std=legacy, the gsymbols are used to
1722 check the interfaces of external procedures from the same file.
1723 The namespace of the gsymbol is resolved and then, once this is
1724 done the interface is checked. */
1728 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1730 if (!gsym_ns->proc_name->attr.recursive)
1733 if (sym->ns == gsym_ns)
1736 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1743 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1745 if (gsym_ns->entries)
1747 gfc_entry_list *entry = gsym_ns->entries;
1749 for (; entry; entry = entry->next)
1751 if (strcmp (sym->name, entry->sym->name) == 0)
1753 if (strcmp (gsym_ns->proc_name->name,
1754 sym->ns->proc_name->name) == 0)
1758 && strcmp (gsym_ns->proc_name->name,
1759 sym->ns->parent->proc_name->name) == 0)
1768 resolve_global_procedure (gfc_symbol *sym, locus *where,
1769 gfc_actual_arglist **actual, int sub)
1773 enum gfc_symbol_type type;
1775 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1777 gsym = gfc_get_gsymbol (sym->name);
1779 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1780 gfc_global_used (gsym, where);
1782 if (gfc_option.flag_whole_file
1783 && sym->attr.if_source == IFSRC_UNKNOWN
1784 && gsym->type != GSYM_UNKNOWN
1786 && gsym->ns->resolved != -1
1787 && gsym->ns->proc_name
1788 && not_in_recursive (sym, gsym->ns)
1789 && not_entry_self_reference (sym, gsym->ns))
1791 /* Make sure that translation for the gsymbol occurs before
1792 the procedure currently being resolved. */
1793 ns = gsym->ns->resolved ? NULL : gfc_global_ns_list;
1794 for (; ns && ns != gsym->ns; ns = ns->sibling)
1796 if (ns->sibling == gsym->ns)
1798 ns->sibling = gsym->ns->sibling;
1799 gsym->ns->sibling = gfc_global_ns_list;
1800 gfc_global_ns_list = gsym->ns;
1805 if (!gsym->ns->resolved)
1807 gfc_dt_list *old_dt_list;
1809 /* Stash away derived types so that the backend_decls do not
1811 old_dt_list = gfc_derived_types;
1812 gfc_derived_types = NULL;
1814 gfc_resolve (gsym->ns);
1816 /* Store the new derived types with the global namespace. */
1817 if (gfc_derived_types)
1818 gsym->ns->derived_types = gfc_derived_types;
1820 /* Restore the derived types of this namespace. */
1821 gfc_derived_types = old_dt_list;
1824 if (gsym->ns->proc_name->attr.function
1825 && gsym->ns->proc_name->as
1826 && gsym->ns->proc_name->as->rank
1827 && (!sym->as || sym->as->rank != gsym->ns->proc_name->as->rank))
1828 gfc_error ("The reference to function '%s' at %L either needs an "
1829 "explicit INTERFACE or the rank is incorrect", sym->name,
1832 if (gfc_option.flag_whole_file == 1
1833 || ((gfc_option.warn_std & GFC_STD_LEGACY)
1835 !(gfc_option.warn_std & GFC_STD_GNU)))
1836 gfc_errors_to_warnings (1);
1838 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1840 gfc_errors_to_warnings (0);
1843 if (gsym->type == GSYM_UNKNOWN)
1846 gsym->where = *where;
1853 /************* Function resolution *************/
1855 /* Resolve a function call known to be generic.
1856 Section 14.1.2.4.1. */
1859 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1863 if (sym->attr.generic)
1865 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1868 expr->value.function.name = s->name;
1869 expr->value.function.esym = s;
1871 if (s->ts.type != BT_UNKNOWN)
1873 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1874 expr->ts = s->result->ts;
1877 expr->rank = s->as->rank;
1878 else if (s->result != NULL && s->result->as != NULL)
1879 expr->rank = s->result->as->rank;
1881 gfc_set_sym_referenced (expr->value.function.esym);
1886 /* TODO: Need to search for elemental references in generic
1890 if (sym->attr.intrinsic)
1891 return gfc_intrinsic_func_interface (expr, 0);
1898 resolve_generic_f (gfc_expr *expr)
1903 sym = expr->symtree->n.sym;
1907 m = resolve_generic_f0 (expr, sym);
1910 else if (m == MATCH_ERROR)
1914 if (sym->ns->parent == NULL)
1916 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1920 if (!generic_sym (sym))
1924 /* Last ditch attempt. See if the reference is to an intrinsic
1925 that possesses a matching interface. 14.1.2.4 */
1926 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
1928 gfc_error ("There is no specific function for the generic '%s' at %L",
1929 expr->symtree->n.sym->name, &expr->where);
1933 m = gfc_intrinsic_func_interface (expr, 0);
1937 gfc_error ("Generic function '%s' at %L is not consistent with a "
1938 "specific intrinsic interface", expr->symtree->n.sym->name,
1945 /* Resolve a function call known to be specific. */
1948 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
1952 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
1954 if (sym->attr.dummy)
1956 sym->attr.proc = PROC_DUMMY;
1960 sym->attr.proc = PROC_EXTERNAL;
1964 if (sym->attr.proc == PROC_MODULE
1965 || sym->attr.proc == PROC_ST_FUNCTION
1966 || sym->attr.proc == PROC_INTERNAL)
1969 if (sym->attr.intrinsic)
1971 m = gfc_intrinsic_func_interface (expr, 1);
1975 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
1976 "with an intrinsic", sym->name, &expr->where);
1984 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1987 expr->ts = sym->result->ts;
1990 expr->value.function.name = sym->name;
1991 expr->value.function.esym = sym;
1992 if (sym->as != NULL)
1993 expr->rank = sym->as->rank;
2000 resolve_specific_f (gfc_expr *expr)
2005 sym = expr->symtree->n.sym;
2009 m = resolve_specific_f0 (sym, expr);
2012 if (m == MATCH_ERROR)
2015 if (sym->ns->parent == NULL)
2018 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2024 gfc_error ("Unable to resolve the specific function '%s' at %L",
2025 expr->symtree->n.sym->name, &expr->where);
2031 /* Resolve a procedure call not known to be generic nor specific. */
2034 resolve_unknown_f (gfc_expr *expr)
2039 sym = expr->symtree->n.sym;
2041 if (sym->attr.dummy)
2043 sym->attr.proc = PROC_DUMMY;
2044 expr->value.function.name = sym->name;
2048 /* See if we have an intrinsic function reference. */
2050 if (gfc_is_intrinsic (sym, 0, expr->where))
2052 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2057 /* The reference is to an external name. */
2059 sym->attr.proc = PROC_EXTERNAL;
2060 expr->value.function.name = sym->name;
2061 expr->value.function.esym = expr->symtree->n.sym;
2063 if (sym->as != NULL)
2064 expr->rank = sym->as->rank;
2066 /* Type of the expression is either the type of the symbol or the
2067 default type of the symbol. */
2070 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2072 if (sym->ts.type != BT_UNKNOWN)
2076 ts = gfc_get_default_type (sym->name, sym->ns);
2078 if (ts->type == BT_UNKNOWN)
2080 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2081 sym->name, &expr->where);
2092 /* Return true, if the symbol is an external procedure. */
2094 is_external_proc (gfc_symbol *sym)
2096 if (!sym->attr.dummy && !sym->attr.contained
2097 && !(sym->attr.intrinsic
2098 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2099 && sym->attr.proc != PROC_ST_FUNCTION
2100 && !sym->attr.use_assoc
2108 /* Figure out if a function reference is pure or not. Also set the name
2109 of the function for a potential error message. Return nonzero if the
2110 function is PURE, zero if not. */
2112 pure_stmt_function (gfc_expr *, gfc_symbol *);
2115 pure_function (gfc_expr *e, const char **name)
2121 if (e->symtree != NULL
2122 && e->symtree->n.sym != NULL
2123 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2124 return pure_stmt_function (e, e->symtree->n.sym);
2126 if (e->value.function.esym)
2128 pure = gfc_pure (e->value.function.esym);
2129 *name = e->value.function.esym->name;
2131 else if (e->value.function.isym)
2133 pure = e->value.function.isym->pure
2134 || e->value.function.isym->elemental;
2135 *name = e->value.function.isym->name;
2139 /* Implicit functions are not pure. */
2141 *name = e->value.function.name;
2149 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2150 int *f ATTRIBUTE_UNUSED)
2154 /* Don't bother recursing into other statement functions
2155 since they will be checked individually for purity. */
2156 if (e->expr_type != EXPR_FUNCTION
2158 || e->symtree->n.sym == sym
2159 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2162 return pure_function (e, &name) ? false : true;
2167 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2169 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2174 is_scalar_expr_ptr (gfc_expr *expr)
2176 gfc_try retval = SUCCESS;
2181 /* See if we have a gfc_ref, which means we have a substring, array
2182 reference, or a component. */
2183 if (expr->ref != NULL)
2186 while (ref->next != NULL)
2192 if (ref->u.ss.length != NULL
2193 && ref->u.ss.length->length != NULL
2195 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2197 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2199 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2200 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2201 if (end - start + 1 != 1)
2208 if (ref->u.ar.type == AR_ELEMENT)
2210 else if (ref->u.ar.type == AR_FULL)
2212 /* The user can give a full array if the array is of size 1. */
2213 if (ref->u.ar.as != NULL
2214 && ref->u.ar.as->rank == 1
2215 && ref->u.ar.as->type == AS_EXPLICIT
2216 && ref->u.ar.as->lower[0] != NULL
2217 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2218 && ref->u.ar.as->upper[0] != NULL
2219 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2221 /* If we have a character string, we need to check if
2222 its length is one. */
2223 if (expr->ts.type == BT_CHARACTER)
2225 if (expr->ts.u.cl == NULL
2226 || expr->ts.u.cl->length == NULL
2227 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2233 /* We have constant lower and upper bounds. If the
2234 difference between is 1, it can be considered a
2236 start = (int) mpz_get_si
2237 (ref->u.ar.as->lower[0]->value.integer);
2238 end = (int) mpz_get_si
2239 (ref->u.ar.as->upper[0]->value.integer);
2240 if (end - start + 1 != 1)
2255 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2257 /* Character string. Make sure it's of length 1. */
2258 if (expr->ts.u.cl == NULL
2259 || expr->ts.u.cl->length == NULL
2260 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2263 else if (expr->rank != 0)
2270 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2271 and, in the case of c_associated, set the binding label based on
2275 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2276 gfc_symbol **new_sym)
2278 char name[GFC_MAX_SYMBOL_LEN + 1];
2279 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2280 int optional_arg = 0, is_pointer = 0;
2281 gfc_try retval = SUCCESS;
2282 gfc_symbol *args_sym;
2283 gfc_typespec *arg_ts;
2285 if (args->expr->expr_type == EXPR_CONSTANT
2286 || args->expr->expr_type == EXPR_OP
2287 || args->expr->expr_type == EXPR_NULL)
2289 gfc_error ("Argument to '%s' at %L is not a variable",
2290 sym->name, &(args->expr->where));
2294 args_sym = args->expr->symtree->n.sym;
2296 /* The typespec for the actual arg should be that stored in the expr
2297 and not necessarily that of the expr symbol (args_sym), because
2298 the actual expression could be a part-ref of the expr symbol. */
2299 arg_ts = &(args->expr->ts);
2301 is_pointer = gfc_is_data_pointer (args->expr);
2303 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2305 /* If the user gave two args then they are providing something for
2306 the optional arg (the second cptr). Therefore, set the name and
2307 binding label to the c_associated for two cptrs. Otherwise,
2308 set c_associated to expect one cptr. */
2312 sprintf (name, "%s_2", sym->name);
2313 sprintf (binding_label, "%s_2", sym->binding_label);
2319 sprintf (name, "%s_1", sym->name);
2320 sprintf (binding_label, "%s_1", sym->binding_label);
2324 /* Get a new symbol for the version of c_associated that
2326 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2328 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2329 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2331 sprintf (name, "%s", sym->name);
2332 sprintf (binding_label, "%s", sym->binding_label);
2334 /* Error check the call. */
2335 if (args->next != NULL)
2337 gfc_error_now ("More actual than formal arguments in '%s' "
2338 "call at %L", name, &(args->expr->where));
2341 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2343 /* Make sure we have either the target or pointer attribute. */
2344 if (!args_sym->attr.target && !is_pointer)
2346 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2347 "a TARGET or an associated pointer",
2349 sym->name, &(args->expr->where));
2353 /* See if we have interoperable type and type param. */
2354 if (verify_c_interop (arg_ts) == SUCCESS
2355 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2357 if (args_sym->attr.target == 1)
2359 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2360 has the target attribute and is interoperable. */
2361 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2362 allocatable variable that has the TARGET attribute and
2363 is not an array of zero size. */
2364 if (args_sym->attr.allocatable == 1)
2366 if (args_sym->attr.dimension != 0
2367 && (args_sym->as && args_sym->as->rank == 0))
2369 gfc_error_now ("Allocatable variable '%s' used as a "
2370 "parameter to '%s' at %L must not be "
2371 "an array of zero size",
2372 args_sym->name, sym->name,
2373 &(args->expr->where));
2379 /* A non-allocatable target variable with C
2380 interoperable type and type parameters must be
2382 if (args_sym && args_sym->attr.dimension)
2384 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2386 gfc_error ("Assumed-shape array '%s' at %L "
2387 "cannot be an argument to the "
2388 "procedure '%s' because "
2389 "it is not C interoperable",
2391 &(args->expr->where), sym->name);
2394 else if (args_sym->as->type == AS_DEFERRED)
2396 gfc_error ("Deferred-shape array '%s' at %L "
2397 "cannot be an argument to the "
2398 "procedure '%s' because "
2399 "it is not C interoperable",
2401 &(args->expr->where), sym->name);
2406 /* Make sure it's not a character string. Arrays of
2407 any type should be ok if the variable is of a C
2408 interoperable type. */
2409 if (arg_ts->type == BT_CHARACTER)
2410 if (arg_ts->u.cl != NULL
2411 && (arg_ts->u.cl->length == NULL
2412 || arg_ts->u.cl->length->expr_type
2415 (arg_ts->u.cl->length->value.integer, 1)
2417 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2419 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2420 "at %L must have a length of 1",
2421 args_sym->name, sym->name,
2422 &(args->expr->where));
2428 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2430 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2432 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2433 "associated scalar POINTER", args_sym->name,
2434 sym->name, &(args->expr->where));
2440 /* The parameter is not required to be C interoperable. If it
2441 is not C interoperable, it must be a nonpolymorphic scalar
2442 with no length type parameters. It still must have either
2443 the pointer or target attribute, and it can be
2444 allocatable (but must be allocated when c_loc is called). */
2445 if (args->expr->rank != 0
2446 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2448 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2449 "scalar", args_sym->name, sym->name,
2450 &(args->expr->where));
2453 else if (arg_ts->type == BT_CHARACTER
2454 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2456 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2457 "%L must have a length of 1",
2458 args_sym->name, sym->name,
2459 &(args->expr->where));
2464 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2466 if (args_sym->attr.flavor != FL_PROCEDURE)
2468 /* TODO: Update this error message to allow for procedure
2469 pointers once they are implemented. */
2470 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2472 args_sym->name, sym->name,
2473 &(args->expr->where));
2476 else if (args_sym->attr.is_bind_c != 1)
2478 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2480 args_sym->name, sym->name,
2481 &(args->expr->where));
2486 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2491 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2492 "iso_c_binding function: '%s'!\n", sym->name);
2499 /* Resolve a function call, which means resolving the arguments, then figuring
2500 out which entity the name refers to. */
2501 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2502 to INTENT(OUT) or INTENT(INOUT). */
2505 resolve_function (gfc_expr *expr)
2507 gfc_actual_arglist *arg;
2512 procedure_type p = PROC_INTRINSIC;
2513 bool no_formal_args;
2517 sym = expr->symtree->n.sym;
2519 if (sym && sym->attr.intrinsic
2520 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2523 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2525 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2529 if (sym && sym->attr.abstract)
2531 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2532 sym->name, &expr->where);
2536 /* Switch off assumed size checking and do this again for certain kinds
2537 of procedure, once the procedure itself is resolved. */
2538 need_full_assumed_size++;
2540 if (expr->symtree && expr->symtree->n.sym)
2541 p = expr->symtree->n.sym->attr.proc;
2543 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2544 if (resolve_actual_arglist (expr->value.function.actual,
2545 p, no_formal_args) == FAILURE)
2548 /* Need to setup the call to the correct c_associated, depending on
2549 the number of cptrs to user gives to compare. */
2550 if (sym && sym->attr.is_iso_c == 1)
2552 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2556 /* Get the symtree for the new symbol (resolved func).
2557 the old one will be freed later, when it's no longer used. */
2558 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2561 /* Resume assumed_size checking. */
2562 need_full_assumed_size--;
2564 /* If the procedure is external, check for usage. */
2565 if (sym && is_external_proc (sym))
2566 resolve_global_procedure (sym, &expr->where,
2567 &expr->value.function.actual, 0);
2569 if (sym && sym->ts.type == BT_CHARACTER
2571 && sym->ts.u.cl->length == NULL
2573 && expr->value.function.esym == NULL
2574 && !sym->attr.contained)
2576 /* Internal procedures are taken care of in resolve_contained_fntype. */
2577 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2578 "be used at %L since it is not a dummy argument",
2579 sym->name, &expr->where);
2583 /* See if function is already resolved. */
2585 if (expr->value.function.name != NULL)
2587 if (expr->ts.type == BT_UNKNOWN)
2593 /* Apply the rules of section 14.1.2. */
2595 switch (procedure_kind (sym))
2598 t = resolve_generic_f (expr);
2601 case PTYPE_SPECIFIC:
2602 t = resolve_specific_f (expr);
2606 t = resolve_unknown_f (expr);
2610 gfc_internal_error ("resolve_function(): bad function type");
2614 /* If the expression is still a function (it might have simplified),
2615 then we check to see if we are calling an elemental function. */
2617 if (expr->expr_type != EXPR_FUNCTION)
2620 temp = need_full_assumed_size;
2621 need_full_assumed_size = 0;
2623 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2626 if (omp_workshare_flag
2627 && expr->value.function.esym
2628 && ! gfc_elemental (expr->value.function.esym))
2630 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2631 "in WORKSHARE construct", expr->value.function.esym->name,
2636 #define GENERIC_ID expr->value.function.isym->id
2637 else if (expr->value.function.actual != NULL
2638 && expr->value.function.isym != NULL
2639 && GENERIC_ID != GFC_ISYM_LBOUND
2640 && GENERIC_ID != GFC_ISYM_LEN
2641 && GENERIC_ID != GFC_ISYM_LOC
2642 && GENERIC_ID != GFC_ISYM_PRESENT)
2644 /* Array intrinsics must also have the last upper bound of an
2645 assumed size array argument. UBOUND and SIZE have to be
2646 excluded from the check if the second argument is anything
2649 for (arg = expr->value.function.actual; arg; arg = arg->next)
2651 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2652 && arg->next != NULL && arg->next->expr)
2654 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2657 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2660 if ((int)mpz_get_si (arg->next->expr->value.integer)
2665 if (arg->expr != NULL
2666 && arg->expr->rank > 0
2667 && resolve_assumed_size_actual (arg->expr))
2673 need_full_assumed_size = temp;
2676 if (!pure_function (expr, &name) && name)
2680 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2681 "FORALL %s", name, &expr->where,
2682 forall_flag == 2 ? "mask" : "block");
2685 else if (gfc_pure (NULL))
2687 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2688 "procedure within a PURE procedure", name, &expr->where);
2693 /* Functions without the RECURSIVE attribution are not allowed to
2694 * call themselves. */
2695 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2698 esym = expr->value.function.esym;
2700 if (is_illegal_recursion (esym, gfc_current_ns))
2702 if (esym->attr.entry && esym->ns->entries)
2703 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2704 " function '%s' is not RECURSIVE",
2705 esym->name, &expr->where, esym->ns->entries->sym->name);
2707 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2708 " is not RECURSIVE", esym->name, &expr->where);
2714 /* Character lengths of use associated functions may contains references to
2715 symbols not referenced from the current program unit otherwise. Make sure
2716 those symbols are marked as referenced. */
2718 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2719 && expr->value.function.esym->attr.use_assoc)
2721 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
2725 && !((expr->value.function.esym
2726 && expr->value.function.esym->attr.elemental)
2728 (expr->value.function.isym
2729 && expr->value.function.isym->elemental)))
2730 find_noncopying_intrinsics (expr->value.function.esym,
2731 expr->value.function.actual);
2733 /* Make sure that the expression has a typespec that works. */
2734 if (expr->ts.type == BT_UNKNOWN)
2736 if (expr->symtree->n.sym->result
2737 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2738 && !expr->symtree->n.sym->result->attr.proc_pointer)
2739 expr->ts = expr->symtree->n.sym->result->ts;
2746 /************* Subroutine resolution *************/
2749 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2755 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2756 sym->name, &c->loc);
2757 else if (gfc_pure (NULL))
2758 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2764 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2768 if (sym->attr.generic)
2770 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2773 c->resolved_sym = s;
2774 pure_subroutine (c, s);
2778 /* TODO: Need to search for elemental references in generic interface. */
2781 if (sym->attr.intrinsic)
2782 return gfc_intrinsic_sub_interface (c, 0);
2789 resolve_generic_s (gfc_code *c)
2794 sym = c->symtree->n.sym;
2798 m = resolve_generic_s0 (c, sym);
2801 else if (m == MATCH_ERROR)
2805 if (sym->ns->parent == NULL)
2807 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2811 if (!generic_sym (sym))
2815 /* Last ditch attempt. See if the reference is to an intrinsic
2816 that possesses a matching interface. 14.1.2.4 */
2817 sym = c->symtree->n.sym;
2819 if (!gfc_is_intrinsic (sym, 1, c->loc))
2821 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2822 sym->name, &c->loc);
2826 m = gfc_intrinsic_sub_interface (c, 0);
2830 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2831 "intrinsic subroutine interface", sym->name, &c->loc);
2837 /* Set the name and binding label of the subroutine symbol in the call
2838 expression represented by 'c' to include the type and kind of the
2839 second parameter. This function is for resolving the appropriate
2840 version of c_f_pointer() and c_f_procpointer(). For example, a
2841 call to c_f_pointer() for a default integer pointer could have a
2842 name of c_f_pointer_i4. If no second arg exists, which is an error
2843 for these two functions, it defaults to the generic symbol's name
2844 and binding label. */
2847 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2848 char *name, char *binding_label)
2850 gfc_expr *arg = NULL;
2854 /* The second arg of c_f_pointer and c_f_procpointer determines
2855 the type and kind for the procedure name. */
2856 arg = c->ext.actual->next->expr;
2860 /* Set up the name to have the given symbol's name,
2861 plus the type and kind. */
2862 /* a derived type is marked with the type letter 'u' */
2863 if (arg->ts.type == BT_DERIVED)
2866 kind = 0; /* set the kind as 0 for now */
2870 type = gfc_type_letter (arg->ts.type);
2871 kind = arg->ts.kind;
2874 if (arg->ts.type == BT_CHARACTER)
2875 /* Kind info for character strings not needed. */
2878 sprintf (name, "%s_%c%d", sym->name, type, kind);
2879 /* Set up the binding label as the given symbol's label plus
2880 the type and kind. */
2881 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2885 /* If the second arg is missing, set the name and label as
2886 was, cause it should at least be found, and the missing
2887 arg error will be caught by compare_parameters(). */
2888 sprintf (name, "%s", sym->name);
2889 sprintf (binding_label, "%s", sym->binding_label);
2896 /* Resolve a generic version of the iso_c_binding procedure given
2897 (sym) to the specific one based on the type and kind of the
2898 argument(s). Currently, this function resolves c_f_pointer() and
2899 c_f_procpointer based on the type and kind of the second argument
2900 (FPTR). Other iso_c_binding procedures aren't specially handled.
2901 Upon successfully exiting, c->resolved_sym will hold the resolved
2902 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2906 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2908 gfc_symbol *new_sym;
2909 /* this is fine, since we know the names won't use the max */
2910 char name[GFC_MAX_SYMBOL_LEN + 1];
2911 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2912 /* default to success; will override if find error */
2913 match m = MATCH_YES;
2915 /* Make sure the actual arguments are in the necessary order (based on the
2916 formal args) before resolving. */
2917 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2919 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2920 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2922 set_name_and_label (c, sym, name, binding_label);
2924 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2926 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
2928 /* Make sure we got a third arg if the second arg has non-zero
2929 rank. We must also check that the type and rank are
2930 correct since we short-circuit this check in
2931 gfc_procedure_use() (called above to sort actual args). */
2932 if (c->ext.actual->next->expr->rank != 0)
2934 if(c->ext.actual->next->next == NULL
2935 || c->ext.actual->next->next->expr == NULL)
2938 gfc_error ("Missing SHAPE parameter for call to %s "
2939 "at %L", sym->name, &(c->loc));
2941 else if (c->ext.actual->next->next->expr->ts.type
2943 || c->ext.actual->next->next->expr->rank != 1)
2946 gfc_error ("SHAPE parameter for call to %s at %L must "
2947 "be a rank 1 INTEGER array", sym->name,
2954 if (m != MATCH_ERROR)
2956 /* the 1 means to add the optional arg to formal list */
2957 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
2959 /* for error reporting, say it's declared where the original was */
2960 new_sym->declared_at = sym->declared_at;
2965 /* no differences for c_loc or c_funloc */
2969 /* set the resolved symbol */
2970 if (m != MATCH_ERROR)
2971 c->resolved_sym = new_sym;
2973 c->resolved_sym = sym;
2979 /* Resolve a subroutine call known to be specific. */
2982 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
2986 if(sym->attr.is_iso_c)
2988 m = gfc_iso_c_sub_interface (c,sym);
2992 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2994 if (sym->attr.dummy)
2996 sym->attr.proc = PROC_DUMMY;
3000 sym->attr.proc = PROC_EXTERNAL;
3004 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3007 if (sym->attr.intrinsic)
3009 m = gfc_intrinsic_sub_interface (c, 1);
3013 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3014 "with an intrinsic", sym->name, &c->loc);
3022 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3024 c->resolved_sym = sym;
3025 pure_subroutine (c, sym);
3032 resolve_specific_s (gfc_code *c)
3037 sym = c->symtree->n.sym;
3041 m = resolve_specific_s0 (c, sym);
3044 if (m == MATCH_ERROR)
3047 if (sym->ns->parent == NULL)
3050 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3056 sym = c->symtree->n.sym;
3057 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3058 sym->name, &c->loc);
3064 /* Resolve a subroutine call not known to be generic nor specific. */
3067 resolve_unknown_s (gfc_code *c)
3071 sym = c->symtree->n.sym;
3073 if (sym->attr.dummy)
3075 sym->attr.proc = PROC_DUMMY;
3079 /* See if we have an intrinsic function reference. */
3081 if (gfc_is_intrinsic (sym, 1, c->loc))
3083 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3088 /* The reference is to an external name. */
3091 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3093 c->resolved_sym = sym;
3095 pure_subroutine (c, sym);
3101 /* Resolve a subroutine call. Although it was tempting to use the same code
3102 for functions, subroutines and functions are stored differently and this
3103 makes things awkward. */
3106 resolve_call (gfc_code *c)
3109 procedure_type ptype = PROC_INTRINSIC;
3110 gfc_symbol *csym, *sym;
3111 bool no_formal_args;
3113 csym = c->symtree ? c->symtree->n.sym : NULL;
3115 if (csym && csym->ts.type != BT_UNKNOWN)
3117 gfc_error ("'%s' at %L has a type, which is not consistent with "
3118 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3122 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3125 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3126 sym = st ? st->n.sym : NULL;
3127 if (sym && csym != sym
3128 && sym->ns == gfc_current_ns
3129 && sym->attr.flavor == FL_PROCEDURE
3130 && sym->attr.contained)
3133 if (csym->attr.generic)
3134 c->symtree->n.sym = sym;
3137 csym = c->symtree->n.sym;
3141 /* Subroutines without the RECURSIVE attribution are not allowed to
3142 * call themselves. */
3143 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3145 if (csym->attr.entry && csym->ns->entries)
3146 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3147 " subroutine '%s' is not RECURSIVE",
3148 csym->name, &c->loc, csym->ns->entries->sym->name);
3150 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3151 " is not RECURSIVE", csym->name, &c->loc);
3156 /* Switch off assumed size checking and do this again for certain kinds
3157 of procedure, once the procedure itself is resolved. */
3158 need_full_assumed_size++;
3161 ptype = csym->attr.proc;
3163 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3164 if (resolve_actual_arglist (c->ext.actual, ptype,
3165 no_formal_args) == FAILURE)
3168 /* Resume assumed_size checking. */
3169 need_full_assumed_size--;
3171 /* If external, check for usage. */
3172 if (csym && is_external_proc (csym))
3173 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3176 if (c->resolved_sym == NULL)
3178 c->resolved_isym = NULL;
3179 switch (procedure_kind (csym))
3182 t = resolve_generic_s (c);
3185 case PTYPE_SPECIFIC:
3186 t = resolve_specific_s (c);
3190 t = resolve_unknown_s (c);
3194 gfc_internal_error ("resolve_subroutine(): bad function type");
3198 /* Some checks of elemental subroutine actual arguments. */
3199 if (resolve_elemental_actual (NULL, c) == FAILURE)
3202 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3203 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3208 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3209 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3210 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3211 if their shapes do not match. If either op1->shape or op2->shape is
3212 NULL, return SUCCESS. */
3215 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3222 if (op1->shape != NULL && op2->shape != NULL)
3224 for (i = 0; i < op1->rank; i++)
3226 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3228 gfc_error ("Shapes for operands at %L and %L are not conformable",
3229 &op1->where, &op2->where);
3240 /* Resolve an operator expression node. This can involve replacing the
3241 operation with a user defined function call. */
3244 resolve_operator (gfc_expr *e)
3246 gfc_expr *op1, *op2;
3248 bool dual_locus_error;
3251 /* Resolve all subnodes-- give them types. */
3253 switch (e->value.op.op)
3256 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3259 /* Fall through... */
3262 case INTRINSIC_UPLUS:
3263 case INTRINSIC_UMINUS:
3264 case INTRINSIC_PARENTHESES:
3265 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3270 /* Typecheck the new node. */
3272 op1 = e->value.op.op1;
3273 op2 = e->value.op.op2;
3274 dual_locus_error = false;
3276 if ((op1 && op1->expr_type == EXPR_NULL)
3277 || (op2 && op2->expr_type == EXPR_NULL))
3279 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3283 switch (e->value.op.op)
3285 case INTRINSIC_UPLUS:
3286 case INTRINSIC_UMINUS:
3287 if (op1->ts.type == BT_INTEGER
3288 || op1->ts.type == BT_REAL
3289 || op1->ts.type == BT_COMPLEX)
3295 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3296 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3299 case INTRINSIC_PLUS:
3300 case INTRINSIC_MINUS:
3301 case INTRINSIC_TIMES:
3302 case INTRINSIC_DIVIDE:
3303 case INTRINSIC_POWER:
3304 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3306 gfc_type_convert_binary (e);
3311 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3312 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3313 gfc_typename (&op2->ts));
3316 case INTRINSIC_CONCAT:
3317 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3318 && op1->ts.kind == op2->ts.kind)
3320 e->ts.type = BT_CHARACTER;
3321 e->ts.kind = op1->ts.kind;
3326 _("Operands of string concatenation operator at %%L are %s/%s"),
3327 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3333 case INTRINSIC_NEQV:
3334 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3336 e->ts.type = BT_LOGICAL;
3337 e->ts.kind = gfc_kind_max (op1, op2);
3338 if (op1->ts.kind < e->ts.kind)
3339 gfc_convert_type (op1, &e->ts, 2);
3340 else if (op2->ts.kind < e->ts.kind)
3341 gfc_convert_type (op2, &e->ts, 2);
3345 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3346 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3347 gfc_typename (&op2->ts));
3352 if (op1->ts.type == BT_LOGICAL)
3354 e->ts.type = BT_LOGICAL;
3355 e->ts.kind = op1->ts.kind;
3359 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3360 gfc_typename (&op1->ts));
3364 case INTRINSIC_GT_OS:
3366 case INTRINSIC_GE_OS:
3368 case INTRINSIC_LT_OS:
3370 case INTRINSIC_LE_OS:
3371 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3373 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3377 /* Fall through... */
3380 case INTRINSIC_EQ_OS:
3382 case INTRINSIC_NE_OS:
3383 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3384 && op1->ts.kind == op2->ts.kind)
3386 e->ts.type = BT_LOGICAL;
3387 e->ts.kind = gfc_default_logical_kind;
3391 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3393 gfc_type_convert_binary (e);
3395 e->ts.type = BT_LOGICAL;
3396 e->ts.kind = gfc_default_logical_kind;
3400 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3402 _("Logicals at %%L must be compared with %s instead of %s"),
3403 (e->value.op.op == INTRINSIC_EQ
3404 || e->value.op.op == INTRINSIC_EQ_OS)
3405 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3408 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3409 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3410 gfc_typename (&op2->ts));
3414 case INTRINSIC_USER:
3415 if (e->value.op.uop->op == NULL)
3416 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3417 else if (op2 == NULL)
3418 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3419 e->value.op.uop->name, gfc_typename (&op1->ts));
3421 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3422 e->value.op.uop->name, gfc_typename (&op1->ts),
3423 gfc_typename (&op2->ts));
3427 case INTRINSIC_PARENTHESES:
3429 if (e->ts.type == BT_CHARACTER)
3430 e->ts.u.cl = op1->ts.u.cl;
3434 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3437 /* Deal with arrayness of an operand through an operator. */
3441 switch (e->value.op.op)
3443 case INTRINSIC_PLUS:
3444 case INTRINSIC_MINUS:
3445 case INTRINSIC_TIMES:
3446 case INTRINSIC_DIVIDE:
3447 case INTRINSIC_POWER:
3448 case INTRINSIC_CONCAT:
3452 case INTRINSIC_NEQV:
3454 case INTRINSIC_EQ_OS:
3456 case INTRINSIC_NE_OS:
3458 case INTRINSIC_GT_OS:
3460 case INTRINSIC_GE_OS:
3462 case INTRINSIC_LT_OS:
3464 case INTRINSIC_LE_OS:
3466 if (op1->rank == 0 && op2->rank == 0)
3469 if (op1->rank == 0 && op2->rank != 0)
3471 e->rank = op2->rank;
3473 if (e->shape == NULL)
3474 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3477 if (op1->rank != 0 && op2->rank == 0)
3479 e->rank = op1->rank;
3481 if (e->shape == NULL)
3482 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3485 if (op1->rank != 0 && op2->rank != 0)
3487 if (op1->rank == op2->rank)
3489 e->rank = op1->rank;
3490 if (e->shape == NULL)
3492 t = compare_shapes(op1, op2);
3496 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3501 /* Allow higher level expressions to work. */
3504 /* Try user-defined operators, and otherwise throw an error. */
3505 dual_locus_error = true;
3507 _("Inconsistent ranks for operator at %%L and %%L"));
3514 case INTRINSIC_PARENTHESES:
3516 case INTRINSIC_UPLUS:
3517 case INTRINSIC_UMINUS:
3518 /* Simply copy arrayness attribute */
3519 e->rank = op1->rank;
3521 if (e->shape == NULL)
3522 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3530 /* Attempt to simplify the expression. */
3533 t = gfc_simplify_expr (e, 0);
3534 /* Some calls do not succeed in simplification and return FAILURE
3535 even though there is no error; e.g. variable references to
3536 PARAMETER arrays. */
3537 if (!gfc_is_constant_expr (e))
3546 if (gfc_extend_expr (e, &real_error) == SUCCESS)
3553 if (dual_locus_error)
3554 gfc_error (msg, &op1->where, &op2->where);
3556 gfc_error (msg, &e->where);
3562 /************** Array resolution subroutines **************/
3565 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3568 /* Compare two integer expressions. */
3571 compare_bound (gfc_expr *a, gfc_expr *b)
3575 if (a == NULL || a->expr_type != EXPR_CONSTANT
3576 || b == NULL || b->expr_type != EXPR_CONSTANT)
3579 /* If either of the types isn't INTEGER, we must have
3580 raised an error earlier. */
3582 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3585 i = mpz_cmp (a->value.integer, b->value.integer);
3595 /* Compare an integer expression with an integer. */
3598 compare_bound_int (gfc_expr *a, int b)
3602 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3605 if (a->ts.type != BT_INTEGER)
3606 gfc_internal_error ("compare_bound_int(): Bad expression");
3608 i = mpz_cmp_si (a->value.integer, b);
3618 /* Compare an integer expression with a mpz_t. */
3621 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3625 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3628 if (a->ts.type != BT_INTEGER)
3629 gfc_internal_error ("compare_bound_int(): Bad expression");
3631 i = mpz_cmp (a->value.integer, b);
3641 /* Compute the last value of a sequence given by a triplet.
3642 Return 0 if it wasn't able to compute the last value, or if the
3643 sequence if empty, and 1 otherwise. */
3646 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3647 gfc_expr *stride, mpz_t last)
3651 if (start == NULL || start->expr_type != EXPR_CONSTANT
3652 || end == NULL || end->expr_type != EXPR_CONSTANT
3653 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3656 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3657 || (stride != NULL && stride->ts.type != BT_INTEGER))
3660 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3662 if (compare_bound (start, end) == CMP_GT)
3664 mpz_set (last, end->value.integer);
3668 if (compare_bound_int (stride, 0) == CMP_GT)
3670 /* Stride is positive */
3671 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3676 /* Stride is negative */
3677 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3682 mpz_sub (rem, end->value.integer, start->value.integer);
3683 mpz_tdiv_r (rem, rem, stride->value.integer);
3684 mpz_sub (last, end->value.integer, rem);
3691 /* Compare a single dimension of an array reference to the array
3695 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3699 /* Given start, end and stride values, calculate the minimum and
3700 maximum referenced indexes. */
3702 switch (ar->dimen_type[i])
3708 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3710 gfc_warning ("Array reference at %L is out of bounds "
3711 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3712 mpz_get_si (ar->start[i]->value.integer),
3713 mpz_get_si (as->lower[i]->value.integer), i+1);
3716 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3718 gfc_warning ("Array reference at %L is out of bounds "
3719 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3720 mpz_get_si (ar->start[i]->value.integer),
3721 mpz_get_si (as->upper[i]->value.integer), i+1);
3729 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3730 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3732 comparison comp_start_end = compare_bound (AR_START, AR_END);
3734 /* Check for zero stride, which is not allowed. */
3735 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3737 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3741 /* if start == len || (stride > 0 && start < len)
3742 || (stride < 0 && start > len),
3743 then the array section contains at least one element. In this
3744 case, there is an out-of-bounds access if
3745 (start < lower || start > upper). */
3746 if (compare_bound (AR_START, AR_END) == CMP_EQ
3747 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3748 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3749 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3750 && comp_start_end == CMP_GT))
3752 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3754 gfc_warning ("Lower array reference at %L is out of bounds "
3755 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3756 mpz_get_si (AR_START->value.integer),
3757 mpz_get_si (as->lower[i]->value.integer), i+1);
3760 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3762 gfc_warning ("Lower array reference at %L is out of bounds "
3763 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3764 mpz_get_si (AR_START->value.integer),
3765 mpz_get_si (as->upper[i]->value.integer), i+1);
3770 /* If we can compute the highest index of the array section,
3771 then it also has to be between lower and upper. */
3772 mpz_init (last_value);
3773 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3776 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3778 gfc_warning ("Upper array reference at %L is out of bounds "
3779 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3780 mpz_get_si (last_value),
3781 mpz_get_si (as->lower[i]->value.integer), i+1);
3782 mpz_clear (last_value);
3785 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3787 gfc_warning ("Upper array reference at %L is out of bounds "
3788 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3789 mpz_get_si (last_value),
3790 mpz_get_si (as->upper[i]->value.integer), i+1);
3791 mpz_clear (last_value);
3795 mpz_clear (last_value);
3803 gfc_internal_error ("check_dimension(): Bad array reference");
3810 /* Compare an array reference with an array specification. */
3813 compare_spec_to_ref (gfc_array_ref *ar)
3820 /* TODO: Full array sections are only allowed as actual parameters. */
3821 if (as->type == AS_ASSUMED_SIZE
3822 && (/*ar->type == AR_FULL
3823 ||*/ (ar->type == AR_SECTION
3824 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3826 gfc_error ("Rightmost upper bound of assumed size array section "
3827 "not specified at %L", &ar->where);
3831 if (ar->type == AR_FULL)
3834 if (as->rank != ar->dimen)
3836 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3837 &ar->where, ar->dimen, as->rank);
3841 for (i = 0; i < as->rank; i++)
3842 if (check_dimension (i, ar, as) == FAILURE)
3849 /* Resolve one part of an array index. */
3852 gfc_resolve_index (gfc_expr *index, int check_scalar)
3859 if (gfc_resolve_expr (index) == FAILURE)
3862 if (check_scalar && index->rank != 0)
3864 gfc_error ("Array index at %L must be scalar", &index->where);
3868 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
3870 gfc_error ("Array index at %L must be of INTEGER type, found %s",
3871 &index->where, gfc_basic_typename (index->ts.type));
3875 if (index->ts.type == BT_REAL)
3876 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
3877 &index->where) == FAILURE)
3880 if (index->ts.kind != gfc_index_integer_kind
3881 || index->ts.type != BT_INTEGER)
3884 ts.type = BT_INTEGER;
3885 ts.kind = gfc_index_integer_kind;
3887 gfc_convert_type_warn (index, &ts, 2, 0);
3893 /* Resolve a dim argument to an intrinsic function. */
3896 gfc_resolve_dim_arg (gfc_expr *dim)
3901 if (gfc_resolve_expr (dim) == FAILURE)
3906 gfc_error ("Argument dim at %L must be scalar", &dim->where);
3911 if (dim->ts.type != BT_INTEGER)
3913 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
3917 if (dim->ts.kind != gfc_index_integer_kind)
3921 ts.type = BT_INTEGER;
3922 ts.kind = gfc_index_integer_kind;
3924 gfc_convert_type_warn (dim, &ts, 2, 0);
3930 /* Given an expression that contains array references, update those array
3931 references to point to the right array specifications. While this is
3932 filled in during matching, this information is difficult to save and load
3933 in a module, so we take care of it here.
3935 The idea here is that the original array reference comes from the
3936 base symbol. We traverse the list of reference structures, setting
3937 the stored reference to references. Component references can
3938 provide an additional array specification. */
3941 find_array_spec (gfc_expr *e)
3945 gfc_symbol *derived;
3948 if (e->symtree->n.sym->ts.type == BT_CLASS)
3949 as = e->symtree->n.sym->ts.u.derived->components->as;
3951 as = e->symtree->n.sym->as;
3954 for (ref = e->ref; ref; ref = ref->next)
3959 gfc_internal_error ("find_array_spec(): Missing spec");
3966 if (derived == NULL)
3967 derived = e->symtree->n.sym->ts.u.derived;
3969 c = derived->components;
3971 for (; c; c = c->next)
3972 if (c == ref->u.c.component)
3974 /* Track the sequence of component references. */
3975 if (c->ts.type == BT_DERIVED)
3976 derived = c->ts.u.derived;
3981 gfc_internal_error ("find_array_spec(): Component not found");
3983 if (c->attr.dimension)
3986 gfc_internal_error ("find_array_spec(): unused as(1)");
3997 gfc_internal_error ("find_array_spec(): unused as(2)");
4001 /* Resolve an array reference. */
4004 resolve_array_ref (gfc_array_ref *ar)
4006 int i, check_scalar;
4009 for (i = 0; i < ar->dimen; i++)
4011 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4013 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
4015 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4017 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4022 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4026 ar->dimen_type[i] = DIMEN_ELEMENT;
4030 ar->dimen_type[i] = DIMEN_VECTOR;
4031 if (e->expr_type == EXPR_VARIABLE
4032 && e->symtree->n.sym->ts.type == BT_DERIVED)
4033 ar->start[i] = gfc_get_parentheses (e);
4037 gfc_error ("Array index at %L is an array of rank %d",
4038 &ar->c_where[i], e->rank);
4043 /* If the reference type is unknown, figure out what kind it is. */
4045 if (ar->type == AR_UNKNOWN)
4047 ar->type = AR_ELEMENT;
4048 for (i = 0; i < ar->dimen; i++)
4049 if (ar->dimen_type[i] == DIMEN_RANGE
4050 || ar->dimen_type[i] == DIMEN_VECTOR)
4052 ar->type = AR_SECTION;
4057 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4065 resolve_substring (gfc_ref *ref)
4067 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4069 if (ref->u.ss.start != NULL)
4071 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4074 if (ref->u.ss.start->ts.type != BT_INTEGER)
4076 gfc_error ("Substring start index at %L must be of type INTEGER",
4077 &ref->u.ss.start->where);
4081 if (ref->u.ss.start->rank != 0)
4083 gfc_error ("Substring start index at %L must be scalar",
4084 &ref->u.ss.start->where);
4088 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4089 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4090 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4092 gfc_error ("Substring start index at %L is less than one",
4093 &ref->u.ss.start->where);
4098 if (ref->u.ss.end != NULL)
4100 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4103 if (ref->u.ss.end->ts.type != BT_INTEGER)
4105 gfc_error ("Substring end index at %L must be of type INTEGER",
4106 &ref->u.ss.end->where);
4110 if (ref->u.ss.end->rank != 0)
4112 gfc_error ("Substring end index at %L must be scalar",
4113 &ref->u.ss.end->where);
4117 if (ref->u.ss.length != NULL
4118 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4119 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4120 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4122 gfc_error ("Substring end index at %L exceeds the string length",
4123 &ref->u.ss.start->where);
4127 if (compare_bound_mpz_t (ref->u.ss.end,
4128 gfc_integer_kinds[k].huge) == CMP_GT
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 end index at %L is too large",
4133 &ref->u.ss.end->where);
4142 /* This function supplies missing substring charlens. */
4145 gfc_resolve_substring_charlen (gfc_expr *e)
4148 gfc_expr *start, *end;
4150 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4151 if (char_ref->type == REF_SUBSTRING)
4157 gcc_assert (char_ref->next == NULL);
4161 if (e->ts.u.cl->length)
4162 gfc_free_expr (e->ts.u.cl->length);
4163 else if (e->expr_type == EXPR_VARIABLE
4164 && e->symtree->n.sym->attr.dummy)
4168 e->ts.type = BT_CHARACTER;
4169 e->ts.kind = gfc_default_character_kind;
4172 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4174 if (char_ref->u.ss.start)
4175 start = gfc_copy_expr (char_ref->u.ss.start);
4177 start = gfc_int_expr (1);
4179 if (char_ref->u.ss.end)
4180 end = gfc_copy_expr (char_ref->u.ss.end);
4181 else if (e->expr_type == EXPR_VARIABLE)
4182 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4189 /* Length = (end - start +1). */
4190 e->ts.u.cl->length = gfc_subtract (end, start);
4191 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length, gfc_int_expr (1));
4193 e->ts.u.cl->length->ts.type = BT_INTEGER;
4194 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4196 /* Make sure that the length is simplified. */
4197 gfc_simplify_expr (e->ts.u.cl->length, 1);
4198 gfc_resolve_expr (e->ts.u.cl->length);
4202 /* Resolve subtype references. */
4205 resolve_ref (gfc_expr *expr)
4207 int current_part_dimension, n_components, seen_part_dimension;
4210 for (ref = expr->ref; ref; ref = ref->next)
4211 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4213 find_array_spec (expr);
4217 for (ref = expr->ref; ref; ref = ref->next)
4221 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4229 resolve_substring (ref);
4233 /* Check constraints on part references. */
4235 current_part_dimension = 0;
4236 seen_part_dimension = 0;
4239 for (ref = expr->ref; ref; ref = ref->next)
4244 switch (ref->u.ar.type)
4248 current_part_dimension = 1;
4252 current_part_dimension = 0;
4256 gfc_internal_error ("resolve_ref(): Bad array reference");
4262 if (current_part_dimension || seen_part_dimension)
4264 if (ref->u.c.component->attr.pointer)
4266 gfc_error ("Component to the right of a part reference "
4267 "with nonzero rank must not have the POINTER "
4268 "attribute at %L", &expr->where);
4271 else if (ref->u.c.component->attr.allocatable)
4273 gfc_error ("Component to the right of a part reference "
4274 "with nonzero rank must not have the ALLOCATABLE "
4275 "attribute at %L", &expr->where);
4287 if (((ref->type == REF_COMPONENT && n_components > 1)
4288 || ref->next == NULL)
4289 && current_part_dimension
4290 && seen_part_dimension)
4292 gfc_error ("Two or more part references with nonzero rank must "
4293 "not be specified at %L", &expr->where);
4297 if (ref->type == REF_COMPONENT)
4299 if (current_part_dimension)
4300 seen_part_dimension = 1;
4302 /* reset to make sure */
4303 current_part_dimension = 0;
4311 /* Given an expression, determine its shape. This is easier than it sounds.
4312 Leaves the shape array NULL if it is not possible to determine the shape. */
4315 expression_shape (gfc_expr *e)
4317 mpz_t array[GFC_MAX_DIMENSIONS];
4320 if (e->rank == 0 || e->shape != NULL)
4323 for (i = 0; i < e->rank; i++)
4324 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4327 e->shape = gfc_get_shape (e->rank);
4329 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4334 for (i--; i >= 0; i--)
4335 mpz_clear (array[i]);
4339 /* Given a variable expression node, compute the rank of the expression by
4340 examining the base symbol and any reference structures it may have. */
4343 expression_rank (gfc_expr *e)
4348 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4349 could lead to serious confusion... */
4350 gcc_assert (e->expr_type != EXPR_COMPCALL);
4354 if (e->expr_type == EXPR_ARRAY)
4356 /* Constructors can have a rank different from one via RESHAPE(). */
4358 if (e->symtree == NULL)
4364 e->rank = (e->symtree->n.sym->as == NULL)
4365 ? 0 : e->symtree->n.sym->as->rank;
4371 for (ref = e->ref; ref; ref = ref->next)
4373 if (ref->type != REF_ARRAY)
4376 if (ref->u.ar.type == AR_FULL)
4378 rank = ref->u.ar.as->rank;
4382 if (ref->u.ar.type == AR_SECTION)
4384 /* Figure out the rank of the section. */
4386 gfc_internal_error ("expression_rank(): Two array specs");
4388 for (i = 0; i < ref->u.ar.dimen; i++)
4389 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4390 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4400 expression_shape (e);
4404 /* Resolve a variable expression. */
4407 resolve_variable (gfc_expr *e)
4414 if (e->symtree == NULL)
4417 if (e->ref && resolve_ref (e) == FAILURE)
4420 sym = e->symtree->n.sym;
4421 if (sym->attr.flavor == FL_PROCEDURE
4422 && (!sym->attr.function
4423 || (sym->attr.function && sym->result
4424 && sym->result->attr.proc_pointer
4425 && !sym->result->attr.function)))
4427 e->ts.type = BT_PROCEDURE;
4428 goto resolve_procedure;
4431 if (sym->ts.type != BT_UNKNOWN)
4432 gfc_variable_attr (e, &e->ts);
4435 /* Must be a simple variable reference. */
4436 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4441 if (check_assumed_size_reference (sym, e))
4444 /* Deal with forward references to entries during resolve_code, to
4445 satisfy, at least partially, 12.5.2.5. */
4446 if (gfc_current_ns->entries
4447 && current_entry_id == sym->entry_id
4450 && cs_base->current->op != EXEC_ENTRY)
4452 gfc_entry_list *entry;
4453 gfc_formal_arglist *formal;
4457 /* If the symbol is a dummy... */
4458 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4460 entry = gfc_current_ns->entries;
4463 /* ...test if the symbol is a parameter of previous entries. */
4464 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4465 for (formal = entry->sym->formal; formal; formal = formal->next)
4467 if (formal->sym && sym->name == formal->sym->name)
4471 /* If it has not been seen as a dummy, this is an error. */
4474 if (specification_expr)
4475 gfc_error ("Variable '%s', used in a specification expression"
4476 ", is referenced at %L before the ENTRY statement "
4477 "in which it is a parameter",
4478 sym->name, &cs_base->current->loc);
4480 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4481 "statement in which it is a parameter",
4482 sym->name, &cs_base->current->loc);
4487 /* Now do the same check on the specification expressions. */
4488 specification_expr = 1;
4489 if (sym->ts.type == BT_CHARACTER
4490 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4494 for (n = 0; n < sym->as->rank; n++)
4496 specification_expr = 1;
4497 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4499 specification_expr = 1;
4500 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4503 specification_expr = 0;
4506 /* Update the symbol's entry level. */
4507 sym->entry_id = current_entry_id + 1;
4511 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4518 /* Checks to see that the correct symbol has been host associated.
4519 The only situation where this arises is that in which a twice
4520 contained function is parsed after the host association is made.
4521 Therefore, on detecting this, change the symbol in the expression
4522 and convert the array reference into an actual arglist if the old
4523 symbol is a variable. */
4525 check_host_association (gfc_expr *e)
4527 gfc_symbol *sym, *old_sym;
4531 gfc_actual_arglist *arg, *tail = NULL;
4532 bool retval = e->expr_type == EXPR_FUNCTION;
4534 /* If the expression is the result of substitution in
4535 interface.c(gfc_extend_expr) because there is no way in
4536 which the host association can be wrong. */
4537 if (e->symtree == NULL
4538 || e->symtree->n.sym == NULL
4539 || e->user_operator)
4542 old_sym = e->symtree->n.sym;
4544 if (gfc_current_ns->parent
4545 && old_sym->ns != gfc_current_ns)
4547 /* Use the 'USE' name so that renamed module symbols are
4548 correctly handled. */
4549 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4551 if (sym && old_sym != sym
4552 && sym->ts.type == old_sym->ts.type
4553 && sym->attr.flavor == FL_PROCEDURE
4554 && sym->attr.contained)
4556 /* Clear the shape, since it might not be valid. */
4557 if (e->shape != NULL)
4559 for (n = 0; n < e->rank; n++)
4560 mpz_clear (e->shape[n]);
4562 gfc_free (e->shape);
4565 /* Give the expression the right symtree! */
4566 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4567 gcc_assert (st != NULL);
4569 if (old_sym->attr.flavor == FL_PROCEDURE
4570 || e->expr_type == EXPR_FUNCTION)
4572 /* Original was function so point to the new symbol, since
4573 the actual argument list is already attached to the
4575 e->value.function.esym = NULL;
4580 /* Original was variable so convert array references into
4581 an actual arglist. This does not need any checking now
4582 since gfc_resolve_function will take care of it. */
4583 e->value.function.actual = NULL;
4584 e->expr_type = EXPR_FUNCTION;
4587 /* Ambiguity will not arise if the array reference is not
4588 the last reference. */
4589 for (ref = e->ref; ref; ref = ref->next)
4590 if (ref->type == REF_ARRAY && ref->next == NULL)
4593 gcc_assert (ref->type == REF_ARRAY);
4595 /* Grab the start expressions from the array ref and
4596 copy them into actual arguments. */
4597 for (n = 0; n < ref->u.ar.dimen; n++)
4599 arg = gfc_get_actual_arglist ();
4600 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4601 if (e->value.function.actual == NULL)
4602 tail = e->value.function.actual = arg;
4610 /* Dump the reference list and set the rank. */
4611 gfc_free_ref_list (e->ref);
4613 e->rank = sym->as ? sym->as->rank : 0;
4616 gfc_resolve_expr (e);
4620 /* This might have changed! */
4621 return e->expr_type == EXPR_FUNCTION;
4626 gfc_resolve_character_operator (gfc_expr *e)
4628 gfc_expr *op1 = e->value.op.op1;
4629 gfc_expr *op2 = e->value.op.op2;
4630 gfc_expr *e1 = NULL;
4631 gfc_expr *e2 = NULL;
4633 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4635 if (op1->ts.u.cl && op1->ts.u.cl->length)
4636 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4637 else if (op1->expr_type == EXPR_CONSTANT)
4638 e1 = gfc_int_expr (op1->value.character.length);
4640 if (op2->ts.u.cl && op2->ts.u.cl->length)
4641 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4642 else if (op2->expr_type == EXPR_CONSTANT)
4643 e2 = gfc_int_expr (op2->value.character.length);
4645 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4650 e->ts.u.cl->length = gfc_add (e1, e2);
4651 e->ts.u.cl->length->ts.type = BT_INTEGER;
4652 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4653 gfc_simplify_expr (e->ts.u.cl->length, 0);
4654 gfc_resolve_expr (e->ts.u.cl->length);
4660 /* Ensure that an character expression has a charlen and, if possible, a
4661 length expression. */
4664 fixup_charlen (gfc_expr *e)
4666 /* The cases fall through so that changes in expression type and the need
4667 for multiple fixes are picked up. In all circumstances, a charlen should
4668 be available for the middle end to hang a backend_decl on. */
4669 switch (e->expr_type)
4672 gfc_resolve_character_operator (e);
4675 if (e->expr_type == EXPR_ARRAY)
4676 gfc_resolve_character_array_constructor (e);
4678 case EXPR_SUBSTRING:
4679 if (!e->ts.u.cl && e->ref)
4680 gfc_resolve_substring_charlen (e);
4684 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4691 /* Update an actual argument to include the passed-object for type-bound
4692 procedures at the right position. */
4694 static gfc_actual_arglist*
4695 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
4698 gcc_assert (argpos > 0);
4702 gfc_actual_arglist* result;
4704 result = gfc_get_actual_arglist ();
4708 result->name = name;
4714 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
4716 lst = update_arglist_pass (NULL, po, argpos - 1, name);
4721 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4724 extract_compcall_passed_object (gfc_expr* e)
4728 gcc_assert (e->expr_type == EXPR_COMPCALL);
4730 if (e->value.compcall.base_object)
4731 po = gfc_copy_expr (e->value.compcall.base_object);
4734 po = gfc_get_expr ();
4735 po->expr_type = EXPR_VARIABLE;
4736 po->symtree = e->symtree;
4737 po->ref = gfc_copy_ref (e->ref);
4740 if (gfc_resolve_expr (po) == FAILURE)
4747 /* Update the arglist of an EXPR_COMPCALL expression to include the
4751 update_compcall_arglist (gfc_expr* e)
4754 gfc_typebound_proc* tbp;
4756 tbp = e->value.compcall.tbp;
4761 po = extract_compcall_passed_object (e);
4767 gfc_error ("Passed-object at %L must be scalar", &e->where);
4771 if (tbp->nopass || e->value.compcall.ignore_pass)
4777 gcc_assert (tbp->pass_arg_num > 0);
4778 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4786 /* Extract the passed object from a PPC call (a copy of it). */
4789 extract_ppc_passed_object (gfc_expr *e)
4794 po = gfc_get_expr ();
4795 po->expr_type = EXPR_VARIABLE;
4796 po->symtree = e->symtree;
4797 po->ref = gfc_copy_ref (e->ref);
4799 /* Remove PPC reference. */
4801 while ((*ref)->next)
4802 (*ref) = (*ref)->next;
4803 gfc_free_ref_list (*ref);
4806 if (gfc_resolve_expr (po) == FAILURE)
4813 /* Update the actual arglist of a procedure pointer component to include the
4817 update_ppc_arglist (gfc_expr* e)
4821 gfc_typebound_proc* tb;
4823 if (!gfc_is_proc_ptr_comp (e, &ppc))
4830 else if (tb->nopass)
4833 po = extract_ppc_passed_object (e);
4839 gfc_error ("Passed-object at %L must be scalar", &e->where);
4843 gcc_assert (tb->pass_arg_num > 0);
4844 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4852 /* Check that the object a TBP is called on is valid, i.e. it must not be
4853 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
4856 check_typebound_baseobject (gfc_expr* e)
4860 base = extract_compcall_passed_object (e);
4864 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
4866 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
4868 gfc_error ("Base object for type-bound procedure call at %L is of"
4869 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
4877 /* Resolve a call to a type-bound procedure, either function or subroutine,
4878 statically from the data in an EXPR_COMPCALL expression. The adapted
4879 arglist and the target-procedure symtree are returned. */
4882 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
4883 gfc_actual_arglist** actual)
4885 gcc_assert (e->expr_type == EXPR_COMPCALL);
4886 gcc_assert (!e->value.compcall.tbp->is_generic);
4888 /* Update the actual arglist for PASS. */
4889 if (update_compcall_arglist (e) == FAILURE)
4892 *actual = e->value.compcall.actual;
4893 *target = e->value.compcall.tbp->u.specific;
4895 gfc_free_ref_list (e->ref);
4897 e->value.compcall.actual = NULL;
4903 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
4904 which of the specific bindings (if any) matches the arglist and transform
4905 the expression into a call of that binding. */
4908 resolve_typebound_generic_call (gfc_expr* e)
4910 gfc_typebound_proc* genproc;
4911 const char* genname;
4913 gcc_assert (e->expr_type == EXPR_COMPCALL);
4914 genname = e->value.compcall.name;
4915 genproc = e->value.compcall.tbp;
4917 if (!genproc->is_generic)
4920 /* Try the bindings on this type and in the inheritance hierarchy. */
4921 for (; genproc; genproc = genproc->overridden)
4925 gcc_assert (genproc->is_generic);
4926 for (g = genproc->u.generic; g; g = g->next)
4929 gfc_actual_arglist* args;
4932 gcc_assert (g->specific);
4934 if (g->specific->error)
4937 target = g->specific->u.specific->n.sym;
4939 /* Get the right arglist by handling PASS/NOPASS. */
4940 args = gfc_copy_actual_arglist (e->value.compcall.actual);
4941 if (!g->specific->nopass)
4944 po = extract_compcall_passed_object (e);
4948 gcc_assert (g->specific->pass_arg_num > 0);
4949 gcc_assert (!g->specific->error);
4950 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
4951 g->specific->pass_arg);
4953 resolve_actual_arglist (args, target->attr.proc,
4954 is_external_proc (target) && !target->formal);
4956 /* Check if this arglist matches the formal. */
4957 matches = gfc_arglist_matches_symbol (&args, target);
4959 /* Clean up and break out of the loop if we've found it. */
4960 gfc_free_actual_arglist (args);
4963 e->value.compcall.tbp = g->specific;
4969 /* Nothing matching found! */
4970 gfc_error ("Found no matching specific binding for the call to the GENERIC"
4971 " '%s' at %L", genname, &e->where);
4979 /* Resolve a call to a type-bound subroutine. */
4982 resolve_typebound_call (gfc_code* c)
4984 gfc_actual_arglist* newactual;
4985 gfc_symtree* target;
4987 /* Check that's really a SUBROUTINE. */
4988 if (!c->expr1->value.compcall.tbp->subroutine)
4990 gfc_error ("'%s' at %L should be a SUBROUTINE",
4991 c->expr1->value.compcall.name, &c->loc);
4995 if (check_typebound_baseobject (c->expr1) == FAILURE)
4998 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
5001 /* Transform into an ordinary EXEC_CALL for now. */
5003 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5006 c->ext.actual = newactual;
5007 c->symtree = target;
5008 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5010 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5012 gfc_free_expr (c->expr1);
5013 c->expr1 = gfc_get_expr ();
5014 c->expr1->expr_type = EXPR_FUNCTION;
5015 c->expr1->symtree = target;
5016 c->expr1->where = c->loc;
5018 return resolve_call (c);
5022 /* Resolve a component-call expression. This originally was intended
5023 only to see functions. However, it is convenient to use it in
5024 resolving subroutine class methods, since we do not have to add a
5025 gfc_code each time. */
5027 resolve_compcall (gfc_expr* e, bool fcn)
5029 gfc_actual_arglist* newactual;
5030 gfc_symtree* target;
5032 /* Check that's really a FUNCTION. */
5033 if (fcn && !e->value.compcall.tbp->function)
5035 gfc_error ("'%s' at %L should be a FUNCTION",
5036 e->value.compcall.name, &e->where);
5039 else if (!fcn && !e->value.compcall.tbp->subroutine)
5041 /* To resolve class member calls, we borrow this bit
5042 of code to select the specific procedures. */
5043 gfc_error ("'%s' at %L should be a SUBROUTINE",
5044 e->value.compcall.name, &e->where);
5048 /* These must not be assign-calls! */
5049 gcc_assert (!e->value.compcall.assign);
5051 if (check_typebound_baseobject (e) == FAILURE)
5054 if (resolve_typebound_generic_call (e) == FAILURE)
5056 gcc_assert (!e->value.compcall.tbp->is_generic);
5058 /* Take the rank from the function's symbol. */
5059 if (e->value.compcall.tbp->u.specific->n.sym->as)
5060 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5062 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5063 arglist to the TBP's binding target. */
5065 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5068 e->value.function.actual = newactual;
5069 e->value.function.name = e->value.compcall.name;
5070 e->value.function.esym = target->n.sym;
5071 e->value.function.class_esym = NULL;
5072 e->value.function.isym = NULL;
5073 e->symtree = target;
5074 e->ts = target->n.sym->ts;
5075 e->expr_type = EXPR_FUNCTION;
5077 /* Resolution is not necessary if this is a class subroutine; this
5078 function only has to identify the specific proc. Resolution of
5079 the call will be done next in resolve_typebound_call. */
5080 return fcn ? gfc_resolve_expr (e) : SUCCESS;
5084 /* Resolve a typebound call for the members in a class. This group of
5085 functions implements dynamic dispatch in the provisional version
5086 of f03 OOP. As soon as vtables are in place and contain pointers
5087 to methods, this will no longer be necessary. */
5088 static gfc_expr *list_e;
5089 static void check_class_members (gfc_symbol *);
5090 static gfc_try class_try;
5091 static bool fcn_flag;
5092 static gfc_symbol *class_object;
5096 check_members (gfc_symbol *derived)
5098 if (derived->attr.flavor == FL_DERIVED)
5099 check_class_members (derived);
5104 check_class_members (gfc_symbol *derived)
5106 gfc_symbol* tbp_sym;
5109 gfc_class_esym_list *etmp;
5111 e = gfc_copy_expr (list_e);
5113 tbp = gfc_find_typebound_proc (derived, &class_try,
5114 e->value.compcall.name,
5119 gfc_error ("no typebound available procedure named '%s' at %L",
5120 e->value.compcall.name, &e->where);
5124 if (tbp->n.tb->is_generic)
5128 /* If we have to match a passed class member, force the actual
5129 expression to have the correct type. */
5130 if (!tbp->n.tb->nopass)
5132 if (e->value.compcall.base_object == NULL)
5133 e->value.compcall.base_object =
5134 extract_compcall_passed_object (e);
5136 e->value.compcall.base_object->ts.type = BT_DERIVED;
5137 e->value.compcall.base_object->ts.u.derived = derived;
5141 tbp_sym = tbp->n.tb->u.specific->n.sym;
5143 e->value.compcall.tbp = tbp->n.tb;
5144 e->value.compcall.name = tbp->name;
5146 /* Let the original expresssion catch the assertion in
5147 resolve_compcall, since this flag does not appear to be reset or
5148 copied in some systems. */
5149 e->value.compcall.assign = 0;
5151 /* Do the renaming, PASSing, generic => specific and other
5152 good things for each class member. */
5153 class_try = (resolve_compcall (e, fcn_flag) == SUCCESS)
5154 ? class_try : FAILURE;
5156 /* Now transfer the found symbol to the esym list. */
5157 if (class_try == SUCCESS)
5159 etmp = list_e->value.function.class_esym;
5160 list_e->value.function.class_esym
5161 = gfc_get_class_esym_list();
5162 list_e->value.function.class_esym->next = etmp;
5163 list_e->value.function.class_esym->derived = derived;
5164 list_e->value.function.class_esym->esym
5165 = e->value.function.esym;
5170 /* Burrow down into grandchildren types. */
5171 if (derived->f2k_derived)
5172 gfc_traverse_ns (derived->f2k_derived, check_members);
5176 /* Eliminate esym_lists where all the members point to the
5177 typebound procedure of the declared type; ie. one where
5178 type selection has no effect.. */
5180 resolve_class_esym (gfc_expr *e)
5182 gfc_class_esym_list *p, *q;
5185 gcc_assert (e && e->expr_type == EXPR_FUNCTION);
5187 p = e->value.function.class_esym;
5191 for (; p; p = p->next)
5192 empty = empty && (e->value.function.esym == p->esym);
5196 p = e->value.function.class_esym;
5202 e->value.function.class_esym = NULL;
5207 /* Generate an expression for the vindex, given the reference to
5208 the class of the final expression (class_ref), the base of the
5209 full reference list (new_ref), the declared type and the class
5212 vindex_expr (gfc_ref *class_ref, gfc_ref *new_ref,
5213 gfc_symbol *declared, gfc_symtree *st)
5218 /* Build an expression for the correct vindex; ie. that of the last
5220 ref = gfc_get_ref();
5221 ref->type = REF_COMPONENT;
5222 ref->u.c.component = declared->components->next;
5223 ref->u.c.sym = declared;
5227 class_ref->next = ref;
5231 gfc_free_ref_list (new_ref);
5234 vindex = gfc_get_expr ();
5235 vindex->expr_type = EXPR_VARIABLE;
5236 vindex->symtree = st;
5237 vindex->symtree->n.sym->refs++;
5238 vindex->ts = ref->u.c.component->ts;
5239 vindex->ref = new_ref;
5245 /* Get the ultimate declared type from an expression. In addition,
5246 return the last class/derived type reference and the copy of the
5249 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5252 gfc_symbol *declared;
5257 *new_ref = gfc_copy_ref (e->ref);
5258 for (ref = *new_ref; ref; ref = ref->next)
5260 if (ref->type != REF_COMPONENT)
5263 if (ref->u.c.component->ts.type == BT_CLASS
5264 || ref->u.c.component->ts.type == BT_DERIVED)
5266 declared = ref->u.c.component->ts.u.derived;
5271 if (declared == NULL)
5272 declared = e->symtree->n.sym->ts.u.derived;
5278 /* Resolve the argument expressions so that any arguments expressions
5279 that include class methods are resolved before the current call.
5280 This is necessary because of the static variables used in CLASS
5281 method resolution. */
5283 resolve_arg_exprs (gfc_actual_arglist *arg)
5285 /* Resolve the actual arglist expressions. */
5286 for (; arg; arg = arg->next)
5289 gfc_resolve_expr (arg->expr);
5294 /* Resolve a CLASS typebound function, or 'method'. */
5296 resolve_class_compcall (gfc_expr* e)
5298 gfc_symbol *derived, *declared;
5304 class_object = st->n.sym;
5306 /* Get the CLASS declared type. */
5307 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5309 /* Weed out cases of the ultimate component being a derived type. */
5310 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5312 gfc_free_ref_list (new_ref);
5313 return resolve_compcall (e, true);
5316 /* Resolve the argument expressions, */
5317 resolve_arg_exprs (e->value.function.actual);
5319 /* Get the data component, which is of the declared type. */
5320 derived = declared->components->ts.u.derived;
5322 /* Resolve the function call for each member of the class. */
5323 class_try = SUCCESS;
5325 list_e = gfc_copy_expr (e);
5326 check_class_members (derived);
5328 class_try = (resolve_compcall (e, true) == SUCCESS)
5329 ? class_try : FAILURE;
5331 /* Transfer the class list to the original expression. Note that
5332 the class_esym list is cleaned up in trans-expr.c, as the calls
5334 e->value.function.class_esym = list_e->value.function.class_esym;
5335 list_e->value.function.class_esym = NULL;
5336 gfc_free_expr (list_e);
5338 resolve_class_esym (e);
5340 /* More than one typebound procedure so transmit an expression for
5341 the vindex as the selector. */
5342 if (e->value.function.class_esym != NULL)
5343 e->value.function.class_esym->vindex
5344 = vindex_expr (class_ref, new_ref, declared, st);
5349 /* Resolve a CLASS typebound subroutine, or 'method'. */
5351 resolve_class_typebound_call (gfc_code *code)
5353 gfc_symbol *derived, *declared;
5358 st = code->expr1->symtree;
5359 class_object = st->n.sym;
5361 /* Get the CLASS declared type. */
5362 declared = get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5364 /* Weed out cases of the ultimate component being a derived type. */
5365 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5367 gfc_free_ref_list (new_ref);
5368 return resolve_typebound_call (code);
5371 /* Resolve the argument expressions, */
5372 resolve_arg_exprs (code->expr1->value.compcall.actual);
5374 /* Get the data component, which is of the declared type. */
5375 derived = declared->components->ts.u.derived;
5377 class_try = SUCCESS;
5379 list_e = gfc_copy_expr (code->expr1);
5380 check_class_members (derived);
5382 class_try = (resolve_typebound_call (code) == SUCCESS)
5383 ? class_try : FAILURE;
5385 /* Transfer the class list to the original expression. Note that
5386 the class_esym list is cleaned up in trans-expr.c, as the calls
5388 code->expr1->value.function.class_esym
5389 = list_e->value.function.class_esym;
5390 list_e->value.function.class_esym = NULL;
5391 gfc_free_expr (list_e);
5393 resolve_class_esym (code->expr1);
5395 /* More than one typebound procedure so transmit an expression for
5396 the vindex as the selector. */
5397 if (code->expr1->value.function.class_esym != NULL)
5398 code->expr1->value.function.class_esym->vindex
5399 = vindex_expr (class_ref, new_ref, declared, st);
5405 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5408 resolve_ppc_call (gfc_code* c)
5410 gfc_component *comp;
5413 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5416 c->resolved_sym = c->expr1->symtree->n.sym;
5417 c->expr1->expr_type = EXPR_VARIABLE;
5419 if (!comp->attr.subroutine)
5420 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5422 if (resolve_ref (c->expr1) == FAILURE)
5425 if (update_ppc_arglist (c->expr1) == FAILURE)
5428 c->ext.actual = c->expr1->value.compcall.actual;
5430 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5431 comp->formal == NULL) == FAILURE)
5434 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5440 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5443 resolve_expr_ppc (gfc_expr* e)
5445 gfc_component *comp;
5448 b = gfc_is_proc_ptr_comp (e, &comp);
5451 /* Convert to EXPR_FUNCTION. */
5452 e->expr_type = EXPR_FUNCTION;
5453 e->value.function.isym = NULL;
5454 e->value.function.actual = e->value.compcall.actual;
5456 if (comp->as != NULL)
5457 e->rank = comp->as->rank;
5459 if (!comp->attr.function)
5460 gfc_add_function (&comp->attr, comp->name, &e->where);
5462 if (resolve_ref (e) == FAILURE)
5465 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5466 comp->formal == NULL) == FAILURE)
5469 if (update_ppc_arglist (e) == FAILURE)
5472 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5478 /* Resolve an expression. That is, make sure that types of operands agree
5479 with their operators, intrinsic operators are converted to function calls
5480 for overloaded types and unresolved function references are resolved. */
5483 gfc_resolve_expr (gfc_expr *e)
5490 switch (e->expr_type)
5493 t = resolve_operator (e);
5499 if (check_host_association (e))
5500 t = resolve_function (e);
5503 t = resolve_variable (e);
5505 expression_rank (e);
5508 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5509 && e->ref->type != REF_SUBSTRING)
5510 gfc_resolve_substring_charlen (e);
5515 if (e->symtree && e->symtree->n.sym->ts.type == BT_CLASS)
5516 t = resolve_class_compcall (e);
5518 t = resolve_compcall (e, true);
5521 case EXPR_SUBSTRING:
5522 t = resolve_ref (e);
5531 t = resolve_expr_ppc (e);
5536 if (resolve_ref (e) == FAILURE)
5539 t = gfc_resolve_array_constructor (e);
5540 /* Also try to expand a constructor. */
5543 expression_rank (e);
5544 gfc_expand_constructor (e);
5547 /* This provides the opportunity for the length of constructors with
5548 character valued function elements to propagate the string length
5549 to the expression. */
5550 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5551 t = gfc_resolve_character_array_constructor (e);
5555 case EXPR_STRUCTURE:
5556 t = resolve_ref (e);
5560 t = resolve_structure_cons (e);
5564 t = gfc_simplify_expr (e, 0);
5568 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5571 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5578 /* Resolve an expression from an iterator. They must be scalar and have
5579 INTEGER or (optionally) REAL type. */
5582 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5583 const char *name_msgid)
5585 if (gfc_resolve_expr (expr) == FAILURE)
5588 if (expr->rank != 0)
5590 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5594 if (expr->ts.type != BT_INTEGER)
5596 if (expr->ts.type == BT_REAL)
5599 return gfc_notify_std (GFC_STD_F95_DEL,
5600 "Deleted feature: %s at %L must be integer",
5601 _(name_msgid), &expr->where);
5604 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5611 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5619 /* Resolve the expressions in an iterator structure. If REAL_OK is
5620 false allow only INTEGER type iterators, otherwise allow REAL types. */
5623 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5625 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5629 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5631 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5636 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5637 "Start expression in DO loop") == FAILURE)
5640 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5641 "End expression in DO loop") == FAILURE)
5644 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5645 "Step expression in DO loop") == FAILURE)
5648 if (iter->step->expr_type == EXPR_CONSTANT)
5650 if ((iter->step->ts.type == BT_INTEGER
5651 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5652 || (iter->step->ts.type == BT_REAL
5653 && mpfr_sgn (iter->step->value.real) == 0))
5655 gfc_error ("Step expression in DO loop at %L cannot be zero",
5656 &iter->step->where);
5661 /* Convert start, end, and step to the same type as var. */
5662 if (iter->start->ts.kind != iter->var->ts.kind
5663 || iter->start->ts.type != iter->var->ts.type)
5664 gfc_convert_type (iter->start, &iter->var->ts, 2);
5666 if (iter->end->ts.kind != iter->var->ts.kind
5667 || iter->end->ts.type != iter->var->ts.type)
5668 gfc_convert_type (iter->end, &iter->var->ts, 2);
5670 if (iter->step->ts.kind != iter->var->ts.kind
5671 || iter->step->ts.type != iter->var->ts.type)
5672 gfc_convert_type (iter->step, &iter->var->ts, 2);
5674 if (iter->start->expr_type == EXPR_CONSTANT
5675 && iter->end->expr_type == EXPR_CONSTANT
5676 && iter->step->expr_type == EXPR_CONSTANT)
5679 if (iter->start->ts.type == BT_INTEGER)
5681 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5682 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5686 sgn = mpfr_sgn (iter->step->value.real);
5687 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5689 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5690 gfc_warning ("DO loop at %L will be executed zero times",
5691 &iter->step->where);
5698 /* Traversal function for find_forall_index. f == 2 signals that
5699 that variable itself is not to be checked - only the references. */
5702 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5704 if (expr->expr_type != EXPR_VARIABLE)
5707 /* A scalar assignment */
5708 if (!expr->ref || *f == 1)
5710 if (expr->symtree->n.sym == sym)
5722 /* Check whether the FORALL index appears in the expression or not.
5723 Returns SUCCESS if SYM is found in EXPR. */
5726 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5728 if (gfc_traverse_expr (expr, sym, forall_index, f))
5735 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5736 to be a scalar INTEGER variable. The subscripts and stride are scalar
5737 INTEGERs, and if stride is a constant it must be nonzero.
5738 Furthermore "A subscript or stride in a forall-triplet-spec shall
5739 not contain a reference to any index-name in the
5740 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5743 resolve_forall_iterators (gfc_forall_iterator *it)
5745 gfc_forall_iterator *iter, *iter2;
5747 for (iter = it; iter; iter = iter->next)
5749 if (gfc_resolve_expr (iter->var) == SUCCESS
5750 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5751 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5754 if (gfc_resolve_expr (iter->start) == SUCCESS
5755 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5756 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5757 &iter->start->where);
5758 if (iter->var->ts.kind != iter->start->ts.kind)
5759 gfc_convert_type (iter->start, &iter->var->ts, 2);
5761 if (gfc_resolve_expr (iter->end) == SUCCESS
5762 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5763 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5765 if (iter->var->ts.kind != iter->end->ts.kind)
5766 gfc_convert_type (iter->end, &iter->var->ts, 2);
5768 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5770 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5771 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5772 &iter->stride->where, "INTEGER");
5774 if (iter->stride->expr_type == EXPR_CONSTANT
5775 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5776 gfc_error ("FORALL stride expression at %L cannot be zero",
5777 &iter->stride->where);
5779 if (iter->var->ts.kind != iter->stride->ts.kind)
5780 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5783 for (iter = it; iter; iter = iter->next)
5784 for (iter2 = iter; iter2; iter2 = iter2->next)
5786 if (find_forall_index (iter2->start,
5787 iter->var->symtree->n.sym, 0) == SUCCESS
5788 || find_forall_index (iter2->end,
5789 iter->var->symtree->n.sym, 0) == SUCCESS
5790 || find_forall_index (iter2->stride,
5791 iter->var->symtree->n.sym, 0) == SUCCESS)
5792 gfc_error ("FORALL index '%s' may not appear in triplet "
5793 "specification at %L", iter->var->symtree->name,
5794 &iter2->start->where);
5799 /* Given a pointer to a symbol that is a derived type, see if it's
5800 inaccessible, i.e. if it's defined in another module and the components are
5801 PRIVATE. The search is recursive if necessary. Returns zero if no
5802 inaccessible components are found, nonzero otherwise. */
5805 derived_inaccessible (gfc_symbol *sym)
5809 if (sym->attr.use_assoc && sym->attr.private_comp)
5812 for (c = sym->components; c; c = c->next)
5814 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
5822 /* Resolve the argument of a deallocate expression. The expression must be
5823 a pointer or a full array. */
5826 resolve_deallocate_expr (gfc_expr *e)
5828 symbol_attribute attr;
5829 int allocatable, pointer, check_intent_in;
5834 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5835 check_intent_in = 1;
5837 if (gfc_resolve_expr (e) == FAILURE)
5840 if (e->expr_type != EXPR_VARIABLE)
5843 sym = e->symtree->n.sym;
5845 if (sym->ts.type == BT_CLASS)
5847 allocatable = sym->ts.u.derived->components->attr.allocatable;
5848 pointer = sym->ts.u.derived->components->attr.pointer;
5852 allocatable = sym->attr.allocatable;
5853 pointer = sym->attr.pointer;
5855 for (ref = e->ref; ref; ref = ref->next)
5858 check_intent_in = 0;
5863 if (ref->u.ar.type != AR_FULL)
5868 c = ref->u.c.component;
5869 if (c->ts.type == BT_CLASS)
5871 allocatable = c->ts.u.derived->components->attr.allocatable;
5872 pointer = c->ts.u.derived->components->attr.pointer;
5876 allocatable = c->attr.allocatable;
5877 pointer = c->attr.pointer;
5887 attr = gfc_expr_attr (e);
5889 if (allocatable == 0 && attr.pointer == 0)
5892 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5896 if (check_intent_in && sym->attr.intent == INTENT_IN)
5898 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5899 sym->name, &e->where);
5903 if (e->ts.type == BT_CLASS)
5905 /* Only deallocate the DATA component. */
5906 gfc_add_component_ref (e, "$data");
5913 /* Returns true if the expression e contains a reference to the symbol sym. */
5915 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5917 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
5924 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
5926 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
5930 /* Given the expression node e for an allocatable/pointer of derived type to be
5931 allocated, get the expression node to be initialized afterwards (needed for
5932 derived types with default initializers, and derived types with allocatable
5933 components that need nullification.) */
5936 gfc_expr_to_initialize (gfc_expr *e)
5942 result = gfc_copy_expr (e);
5944 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
5945 for (ref = result->ref; ref; ref = ref->next)
5946 if (ref->type == REF_ARRAY && ref->next == NULL)
5948 ref->u.ar.type = AR_FULL;
5950 for (i = 0; i < ref->u.ar.dimen; i++)
5951 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
5953 result->rank = ref->u.ar.dimen;
5961 /* Used in resolve_allocate_expr to check that a allocation-object and
5962 a source-expr are conformable. This does not catch all possible
5963 cases; in particular a runtime checking is needed. */
5966 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
5968 /* First compare rank. */
5969 if (e2->ref && e1->rank != e2->ref->u.ar.as->rank)
5971 gfc_error ("Source-expr at %L must be scalar or have the "
5972 "same rank as the allocate-object at %L",
5973 &e1->where, &e2->where);
5984 for (i = 0; i < e1->rank; i++)
5986 if (e2->ref->u.ar.end[i])
5988 mpz_set (s, e2->ref->u.ar.end[i]->value.integer);
5989 mpz_sub (s, s, e2->ref->u.ar.start[i]->value.integer);
5990 mpz_add_ui (s, s, 1);
5994 mpz_set (s, e2->ref->u.ar.start[i]->value.integer);
5997 if (mpz_cmp (e1->shape[i], s) != 0)
5999 gfc_error ("Source-expr at %L and allocate-object at %L must "
6000 "have the same shape", &e1->where, &e2->where);
6013 /* Resolve the expression in an ALLOCATE statement, doing the additional
6014 checks to see whether the expression is OK or not. The expression must
6015 have a trailing array reference that gives the size of the array. */
6018 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6020 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6021 symbol_attribute attr;
6022 gfc_ref *ref, *ref2;
6028 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6029 check_intent_in = 1;
6031 if (gfc_resolve_expr (e) == FAILURE)
6034 /* Make sure the expression is allocatable or a pointer. If it is
6035 pointer, the next-to-last reference must be a pointer. */
6039 sym = e->symtree->n.sym;
6041 /* Check whether ultimate component is abstract and CLASS. */
6044 if (e->expr_type != EXPR_VARIABLE)
6047 attr = gfc_expr_attr (e);
6048 pointer = attr.pointer;
6049 dimension = attr.dimension;
6053 if (sym->ts.type == BT_CLASS)
6055 allocatable = sym->ts.u.derived->components->attr.allocatable;
6056 pointer = sym->ts.u.derived->components->attr.pointer;
6057 dimension = sym->ts.u.derived->components->attr.dimension;
6058 is_abstract = sym->ts.u.derived->components->attr.abstract;
6062 allocatable = sym->attr.allocatable;
6063 pointer = sym->attr.pointer;
6064 dimension = sym->attr.dimension;
6067 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6070 check_intent_in = 0;
6075 if (ref->next != NULL)
6080 c = ref->u.c.component;
6081 if (c->ts.type == BT_CLASS)
6083 allocatable = c->ts.u.derived->components->attr.allocatable;
6084 pointer = c->ts.u.derived->components->attr.pointer;
6085 dimension = c->ts.u.derived->components->attr.dimension;
6086 is_abstract = c->ts.u.derived->components->attr.abstract;
6090 allocatable = c->attr.allocatable;
6091 pointer = c->attr.pointer;
6092 dimension = c->attr.dimension;
6093 is_abstract = c->attr.abstract;
6105 if (allocatable == 0 && pointer == 0)
6107 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6112 /* Some checks for the SOURCE tag. */
6115 /* Check F03:C631. */
6116 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6118 gfc_error ("Type of entity at %L is type incompatible with "
6119 "source-expr at %L", &e->where, &code->expr3->where);
6123 /* Check F03:C632 and restriction following Note 6.18. */
6124 if (code->expr3->rank > 0
6125 && conformable_arrays (code->expr3, e) == FAILURE)
6128 /* Check F03:C633. */
6129 if (code->expr3->ts.kind != e->ts.kind)
6131 gfc_error ("The allocate-object at %L and the source-expr at %L "
6132 "shall have the same kind type parameter",
6133 &e->where, &code->expr3->where);
6137 else if (is_abstract&& code->ext.alloc.ts.type == BT_UNKNOWN)
6139 gcc_assert (e->ts.type == BT_CLASS);
6140 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6141 "type-spec or SOURCE=", sym->name, &e->where);
6145 if (check_intent_in && sym->attr.intent == INTENT_IN)
6147 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6148 sym->name, &e->where);
6152 if (pointer || dimension == 0)
6155 /* Make sure the next-to-last reference node is an array specification. */
6157 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
6159 gfc_error ("Array specification required in ALLOCATE statement "
6160 "at %L", &e->where);
6164 /* Make sure that the array section reference makes sense in the
6165 context of an ALLOCATE specification. */
6169 for (i = 0; i < ar->dimen; i++)
6171 if (ref2->u.ar.type == AR_ELEMENT)
6174 switch (ar->dimen_type[i])
6180 if (ar->start[i] != NULL
6181 && ar->end[i] != NULL
6182 && ar->stride[i] == NULL)
6185 /* Fall Through... */
6189 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6196 for (a = code->ext.alloc.list; a; a = a->next)
6198 sym = a->expr->symtree->n.sym;
6200 /* TODO - check derived type components. */
6201 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6204 if ((ar->start[i] != NULL
6205 && gfc_find_sym_in_expr (sym, ar->start[i]))
6206 || (ar->end[i] != NULL
6207 && gfc_find_sym_in_expr (sym, ar->end[i])))
6209 gfc_error ("'%s' must not appear in the array specification at "
6210 "%L in the same ALLOCATE statement where it is "
6211 "itself allocated", sym->name, &ar->where);
6221 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6223 gfc_expr *stat, *errmsg, *pe, *qe;
6224 gfc_alloc *a, *p, *q;
6226 stat = code->expr1 ? code->expr1 : NULL;
6228 errmsg = code->expr2 ? code->expr2 : NULL;
6230 /* Check the stat variable. */
6233 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6234 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6235 stat->symtree->n.sym->name, &stat->where);
6237 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6238 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6241 if ((stat->ts.type != BT_INTEGER
6242 && !(stat->ref && (stat->ref->type == REF_ARRAY
6243 || stat->ref->type == REF_COMPONENT)))
6245 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6246 "variable", &stat->where);
6248 for (p = code->ext.alloc.list; p; p = p->next)
6249 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6250 gfc_error ("Stat-variable at %L shall not be %sd within "
6251 "the same %s statement", &stat->where, fcn, fcn);
6254 /* Check the errmsg variable. */
6258 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6261 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6262 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6263 errmsg->symtree->n.sym->name, &errmsg->where);
6265 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6266 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6269 if ((errmsg->ts.type != BT_CHARACTER
6271 && (errmsg->ref->type == REF_ARRAY
6272 || errmsg->ref->type == REF_COMPONENT)))
6273 || errmsg->rank > 0 )
6274 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6275 "variable", &errmsg->where);
6277 for (p = code->ext.alloc.list; p; p = p->next)
6278 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6279 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6280 "the same %s statement", &errmsg->where, fcn, fcn);
6283 /* Check that an allocate-object appears only once in the statement.
6284 FIXME: Checking derived types is disabled. */
6285 for (p = code->ext.alloc.list; p; p = p->next)
6288 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6289 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6291 for (q = p->next; q; q = q->next)
6294 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6295 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6296 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6297 gfc_error ("Allocate-object at %L also appears at %L",
6298 &pe->where, &qe->where);
6303 if (strcmp (fcn, "ALLOCATE") == 0)
6305 for (a = code->ext.alloc.list; a; a = a->next)
6306 resolve_allocate_expr (a->expr, code);
6310 for (a = code->ext.alloc.list; a; a = a->next)
6311 resolve_deallocate_expr (a->expr);
6316 /************ SELECT CASE resolution subroutines ************/
6318 /* Callback function for our mergesort variant. Determines interval
6319 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6320 op1 > op2. Assumes we're not dealing with the default case.
6321 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6322 There are nine situations to check. */
6325 compare_cases (const gfc_case *op1, const gfc_case *op2)
6329 if (op1->low == NULL) /* op1 = (:L) */
6331 /* op2 = (:N), so overlap. */
6333 /* op2 = (M:) or (M:N), L < M */
6334 if (op2->low != NULL
6335 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6338 else if (op1->high == NULL) /* op1 = (K:) */
6340 /* op2 = (M:), so overlap. */
6342 /* op2 = (:N) or (M:N), K > N */
6343 if (op2->high != NULL
6344 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6347 else /* op1 = (K:L) */
6349 if (op2->low == NULL) /* op2 = (:N), K > N */
6350 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6352 else if (op2->high == NULL) /* op2 = (M:), L < M */
6353 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6355 else /* op2 = (M:N) */
6359 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6362 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6371 /* Merge-sort a double linked case list, detecting overlap in the
6372 process. LIST is the head of the double linked case list before it
6373 is sorted. Returns the head of the sorted list if we don't see any
6374 overlap, or NULL otherwise. */
6377 check_case_overlap (gfc_case *list)
6379 gfc_case *p, *q, *e, *tail;
6380 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6382 /* If the passed list was empty, return immediately. */
6389 /* Loop unconditionally. The only exit from this loop is a return
6390 statement, when we've finished sorting the case list. */
6397 /* Count the number of merges we do in this pass. */
6400 /* Loop while there exists a merge to be done. */
6405 /* Count this merge. */
6408 /* Cut the list in two pieces by stepping INSIZE places
6409 forward in the list, starting from P. */
6412 for (i = 0; i < insize; i++)
6421 /* Now we have two lists. Merge them! */
6422 while (psize > 0 || (qsize > 0 && q != NULL))
6424 /* See from which the next case to merge comes from. */
6427 /* P is empty so the next case must come from Q. */
6432 else if (qsize == 0 || q == NULL)
6441 cmp = compare_cases (p, q);
6444 /* The whole case range for P is less than the
6452 /* The whole case range for Q is greater than
6453 the case range for P. */
6460 /* The cases overlap, or they are the same
6461 element in the list. Either way, we must
6462 issue an error and get the next case from P. */
6463 /* FIXME: Sort P and Q by line number. */
6464 gfc_error ("CASE label at %L overlaps with CASE "
6465 "label at %L", &p->where, &q->where);
6473 /* Add the next element to the merged list. */
6482 /* P has now stepped INSIZE places along, and so has Q. So
6483 they're the same. */
6488 /* If we have done only one merge or none at all, we've
6489 finished sorting the cases. */
6498 /* Otherwise repeat, merging lists twice the size. */
6504 /* Check to see if an expression is suitable for use in a CASE statement.
6505 Makes sure that all case expressions are scalar constants of the same
6506 type. Return FAILURE if anything is wrong. */
6509 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6511 if (e == NULL) return SUCCESS;
6513 if (e->ts.type != case_expr->ts.type)
6515 gfc_error ("Expression in CASE statement at %L must be of type %s",
6516 &e->where, gfc_basic_typename (case_expr->ts.type));
6520 /* C805 (R808) For a given case-construct, each case-value shall be of
6521 the same type as case-expr. For character type, length differences
6522 are allowed, but the kind type parameters shall be the same. */
6524 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6526 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6527 &e->where, case_expr->ts.kind);
6531 /* Convert the case value kind to that of case expression kind, if needed.
6532 FIXME: Should a warning be issued? */
6533 if (e->ts.kind != case_expr->ts.kind)
6534 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6538 gfc_error ("Expression in CASE statement at %L must be scalar",
6547 /* Given a completely parsed select statement, we:
6549 - Validate all expressions and code within the SELECT.
6550 - Make sure that the selection expression is not of the wrong type.
6551 - Make sure that no case ranges overlap.
6552 - Eliminate unreachable cases and unreachable code resulting from
6553 removing case labels.
6555 The standard does allow unreachable cases, e.g. CASE (5:3). But
6556 they are a hassle for code generation, and to prevent that, we just
6557 cut them out here. This is not necessary for overlapping cases
6558 because they are illegal and we never even try to generate code.
6560 We have the additional caveat that a SELECT construct could have
6561 been a computed GOTO in the source code. Fortunately we can fairly
6562 easily work around that here: The case_expr for a "real" SELECT CASE
6563 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6564 we have to do is make sure that the case_expr is a scalar integer
6568 resolve_select (gfc_code *code)
6571 gfc_expr *case_expr;
6572 gfc_case *cp, *default_case, *tail, *head;
6573 int seen_unreachable;
6579 if (code->expr1 == NULL)
6581 /* This was actually a computed GOTO statement. */
6582 case_expr = code->expr2;
6583 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6584 gfc_error ("Selection expression in computed GOTO statement "
6585 "at %L must be a scalar integer expression",
6588 /* Further checking is not necessary because this SELECT was built
6589 by the compiler, so it should always be OK. Just move the
6590 case_expr from expr2 to expr so that we can handle computed
6591 GOTOs as normal SELECTs from here on. */
6592 code->expr1 = code->expr2;
6597 case_expr = code->expr1;
6599 type = case_expr->ts.type;
6600 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6602 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6603 &case_expr->where, gfc_typename (&case_expr->ts));
6605 /* Punt. Going on here just produce more garbage error messages. */
6609 if (case_expr->rank != 0)
6611 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6612 "expression", &case_expr->where);
6618 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6619 of the SELECT CASE expression and its CASE values. Walk the lists
6620 of case values, and if we find a mismatch, promote case_expr to
6621 the appropriate kind. */
6623 if (type == BT_LOGICAL || type == BT_INTEGER)
6625 for (body = code->block; body; body = body->block)
6627 /* Walk the case label list. */
6628 for (cp = body->ext.case_list; cp; cp = cp->next)
6630 /* Intercept the DEFAULT case. It does not have a kind. */
6631 if (cp->low == NULL && cp->high == NULL)
6634 /* Unreachable case ranges are discarded, so ignore. */
6635 if (cp->low != NULL && cp->high != NULL
6636 && cp->low != cp->high
6637 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6640 /* FIXME: Should a warning be issued? */
6642 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6643 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6645 if (cp->high != NULL
6646 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6647 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6652 /* Assume there is no DEFAULT case. */
6653 default_case = NULL;
6658 for (body = code->block; body; body = body->block)
6660 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6662 seen_unreachable = 0;
6664 /* Walk the case label list, making sure that all case labels
6666 for (cp = body->ext.case_list; cp; cp = cp->next)
6668 /* Count the number of cases in the whole construct. */
6671 /* Intercept the DEFAULT case. */
6672 if (cp->low == NULL && cp->high == NULL)
6674 if (default_case != NULL)
6676 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6677 "by a second DEFAULT CASE at %L",
6678 &default_case->where, &cp->where);
6689 /* Deal with single value cases and case ranges. Errors are
6690 issued from the validation function. */
6691 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
6692 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
6698 if (type == BT_LOGICAL
6699 && ((cp->low == NULL || cp->high == NULL)
6700 || cp->low != cp->high))
6702 gfc_error ("Logical range in CASE statement at %L is not "
6703 "allowed", &cp->low->where);
6708 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
6711 value = cp->low->value.logical == 0 ? 2 : 1;
6712 if (value & seen_logical)
6714 gfc_error ("constant logical value in CASE statement "
6715 "is repeated at %L",
6720 seen_logical |= value;
6723 if (cp->low != NULL && cp->high != NULL
6724 && cp->low != cp->high
6725 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6727 if (gfc_option.warn_surprising)
6728 gfc_warning ("Range specification at %L can never "
6729 "be matched", &cp->where);
6731 cp->unreachable = 1;
6732 seen_unreachable = 1;
6736 /* If the case range can be matched, it can also overlap with
6737 other cases. To make sure it does not, we put it in a
6738 double linked list here. We sort that with a merge sort
6739 later on to detect any overlapping cases. */
6743 head->right = head->left = NULL;
6748 tail->right->left = tail;
6755 /* It there was a failure in the previous case label, give up
6756 for this case label list. Continue with the next block. */
6760 /* See if any case labels that are unreachable have been seen.
6761 If so, we eliminate them. This is a bit of a kludge because
6762 the case lists for a single case statement (label) is a
6763 single forward linked lists. */
6764 if (seen_unreachable)
6766 /* Advance until the first case in the list is reachable. */
6767 while (body->ext.case_list != NULL
6768 && body->ext.case_list->unreachable)
6770 gfc_case *n = body->ext.case_list;
6771 body->ext.case_list = body->ext.case_list->next;
6773 gfc_free_case_list (n);
6776 /* Strip all other unreachable cases. */
6777 if (body->ext.case_list)
6779 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6781 if (cp->next->unreachable)
6783 gfc_case *n = cp->next;
6784 cp->next = cp->next->next;
6786 gfc_free_case_list (n);
6793 /* See if there were overlapping cases. If the check returns NULL,
6794 there was overlap. In that case we don't do anything. If head
6795 is non-NULL, we prepend the DEFAULT case. The sorted list can
6796 then used during code generation for SELECT CASE constructs with
6797 a case expression of a CHARACTER type. */
6800 head = check_case_overlap (head);
6802 /* Prepend the default_case if it is there. */
6803 if (head != NULL && default_case)
6805 default_case->left = NULL;
6806 default_case->right = head;
6807 head->left = default_case;
6811 /* Eliminate dead blocks that may be the result if we've seen
6812 unreachable case labels for a block. */
6813 for (body = code; body && body->block; body = body->block)
6815 if (body->block->ext.case_list == NULL)
6817 /* Cut the unreachable block from the code chain. */
6818 gfc_code *c = body->block;
6819 body->block = c->block;
6821 /* Kill the dead block, but not the blocks below it. */
6823 gfc_free_statements (c);
6827 /* More than two cases is legal but insane for logical selects.
6828 Issue a warning for it. */
6829 if (gfc_option.warn_surprising && type == BT_LOGICAL
6831 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6836 /* Check if a derived type is extensible. */
6839 gfc_type_is_extensible (gfc_symbol *sym)
6841 return !(sym->attr.is_bind_c || sym->attr.sequence);
6845 /* Resolve a SELECT TYPE statement. */
6848 resolve_select_type (gfc_code *code)
6850 gfc_symbol *selector_type;
6851 gfc_code *body, *new_st;
6852 gfc_case *c, *default_case;
6854 char name[GFC_MAX_SYMBOL_LEN];
6861 selector_type = code->expr2->ts.u.derived->components->ts.u.derived;
6863 selector_type = code->expr1->ts.u.derived->components->ts.u.derived;
6865 /* Assume there is no DEFAULT case. */
6866 default_case = NULL;
6868 /* Loop over TYPE IS / CLASS IS cases. */
6869 for (body = code->block; body; body = body->block)
6871 c = body->ext.case_list;
6873 /* Check F03:C815. */
6874 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6875 && !gfc_type_is_extensible (c->ts.u.derived))
6877 gfc_error ("Derived type '%s' at %L must be extensible",
6878 c->ts.u.derived->name, &c->where);
6882 /* Check F03:C816. */
6883 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6884 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
6886 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
6887 c->ts.u.derived->name, &c->where, selector_type->name);
6891 /* Intercept the DEFAULT case. */
6892 if (c->ts.type == BT_UNKNOWN)
6894 /* Check F03:C818. */
6895 if (default_case != NULL)
6896 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6897 "by a second DEFAULT CASE at %L",
6898 &default_case->where, &c->where);
6907 /* Insert assignment for selector variable. */
6908 new_st = gfc_get_code ();
6909 new_st->op = EXEC_ASSIGN;
6910 new_st->expr1 = gfc_copy_expr (code->expr1);
6911 new_st->expr2 = gfc_copy_expr (code->expr2);
6915 /* Put SELECT TYPE statement inside a BLOCK. */
6916 new_st = gfc_get_code ();
6917 new_st->op = code->op;
6918 new_st->expr1 = code->expr1;
6919 new_st->expr2 = code->expr2;
6920 new_st->block = code->block;
6924 ns->code->next = new_st;
6925 code->op = EXEC_BLOCK;
6926 code->expr1 = code->expr2 = NULL;
6931 /* Transform to EXEC_SELECT. */
6932 code->op = EXEC_SELECT;
6933 gfc_add_component_ref (code->expr1, "$vindex");
6935 /* Loop over TYPE IS / CLASS IS cases. */
6936 for (body = code->block; body; body = body->block)
6938 c = body->ext.case_list;
6939 if (c->ts.type == BT_DERIVED)
6940 c->low = c->high = gfc_int_expr (c->ts.u.derived->vindex);
6941 else if (c->ts.type == BT_CLASS)
6942 /* Currently IS CLASS blocks are simply ignored.
6943 TODO: Implement IS CLASS. */
6946 if (c->ts.type != BT_DERIVED)
6948 /* Assign temporary to selector. */
6949 sprintf (name, "tmp$%s", c->ts.u.derived->name);
6950 st = gfc_find_symtree (ns->sym_root, name);
6951 new_st = gfc_get_code ();
6952 new_st->op = EXEC_POINTER_ASSIGN;
6953 new_st->expr1 = gfc_get_variable_expr (st);
6954 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
6955 gfc_add_component_ref (new_st->expr2, "$data");
6956 new_st->next = body->next;
6957 body->next = new_st;
6960 /* Eliminate dead blocks. */
6961 for (body = code; body && body->block; body = body->block)
6963 if (body->block->ext.case_list->unreachable)
6965 /* Cut the unreachable block from the code chain. */
6966 gfc_code *cd = body->block;
6967 body->block = cd->block;
6968 /* Kill the dead block, but not the blocks below it. */
6970 gfc_free_statements (cd);
6974 resolve_select (code);
6979 /* Resolve a transfer statement. This is making sure that:
6980 -- a derived type being transferred has only non-pointer components
6981 -- a derived type being transferred doesn't have private components, unless
6982 it's being transferred from the module where the type was defined
6983 -- we're not trying to transfer a whole assumed size array. */
6986 resolve_transfer (gfc_code *code)
6995 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
6998 sym = exp->symtree->n.sym;
7001 /* Go to actual component transferred. */
7002 for (ref = code->expr1->ref; ref; ref = ref->next)
7003 if (ref->type == REF_COMPONENT)
7004 ts = &ref->u.c.component->ts;
7006 if (ts->type == BT_DERIVED)
7008 /* Check that transferred derived type doesn't contain POINTER
7010 if (ts->u.derived->attr.pointer_comp)
7012 gfc_error ("Data transfer element at %L cannot have "
7013 "POINTER components", &code->loc);
7017 if (ts->u.derived->attr.alloc_comp)
7019 gfc_error ("Data transfer element at %L cannot have "
7020 "ALLOCATABLE components", &code->loc);
7024 if (derived_inaccessible (ts->u.derived))
7026 gfc_error ("Data transfer element at %L cannot have "
7027 "PRIVATE components",&code->loc);
7032 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7033 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7035 gfc_error ("Data transfer element at %L cannot be a full reference to "
7036 "an assumed-size array", &code->loc);
7042 /*********** Toplevel code resolution subroutines ***********/
7044 /* Find the set of labels that are reachable from this block. We also
7045 record the last statement in each block. */
7048 find_reachable_labels (gfc_code *block)
7055 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7057 /* Collect labels in this block. We don't keep those corresponding
7058 to END {IF|SELECT}, these are checked in resolve_branch by going
7059 up through the code_stack. */
7060 for (c = block; c; c = c->next)
7062 if (c->here && c->op != EXEC_END_BLOCK)
7063 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7066 /* Merge with labels from parent block. */
7069 gcc_assert (cs_base->prev->reachable_labels);
7070 bitmap_ior_into (cs_base->reachable_labels,
7071 cs_base->prev->reachable_labels);
7075 /* Given a branch to a label, see if the branch is conforming.
7076 The code node describes where the branch is located. */
7079 resolve_branch (gfc_st_label *label, gfc_code *code)
7086 /* Step one: is this a valid branching target? */
7088 if (label->defined == ST_LABEL_UNKNOWN)
7090 gfc_error ("Label %d referenced at %L is never defined", label->value,
7095 if (label->defined != ST_LABEL_TARGET)
7097 gfc_error ("Statement at %L is not a valid branch target statement "
7098 "for the branch statement at %L", &label->where, &code->loc);
7102 /* Step two: make sure this branch is not a branch to itself ;-) */
7104 if (code->here == label)
7106 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7110 /* Step three: See if the label is in the same block as the
7111 branching statement. The hard work has been done by setting up
7112 the bitmap reachable_labels. */
7114 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7117 /* Step four: If we haven't found the label in the bitmap, it may
7118 still be the label of the END of the enclosing block, in which
7119 case we find it by going up the code_stack. */
7121 for (stack = cs_base; stack; stack = stack->prev)
7122 if (stack->current->next && stack->current->next->here == label)
7127 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7131 /* The label is not in an enclosing block, so illegal. This was
7132 allowed in Fortran 66, so we allow it as extension. No
7133 further checks are necessary in this case. */
7134 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7135 "as the GOTO statement at %L", &label->where,
7141 /* Check whether EXPR1 has the same shape as EXPR2. */
7144 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7146 mpz_t shape[GFC_MAX_DIMENSIONS];
7147 mpz_t shape2[GFC_MAX_DIMENSIONS];
7148 gfc_try result = FAILURE;
7151 /* Compare the rank. */
7152 if (expr1->rank != expr2->rank)
7155 /* Compare the size of each dimension. */
7156 for (i=0; i<expr1->rank; i++)
7158 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7161 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7164 if (mpz_cmp (shape[i], shape2[i]))
7168 /* When either of the two expression is an assumed size array, we
7169 ignore the comparison of dimension sizes. */
7174 for (i--; i >= 0; i--)
7176 mpz_clear (shape[i]);
7177 mpz_clear (shape2[i]);
7183 /* Check whether a WHERE assignment target or a WHERE mask expression
7184 has the same shape as the outmost WHERE mask expression. */
7187 resolve_where (gfc_code *code, gfc_expr *mask)
7193 cblock = code->block;
7195 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7196 In case of nested WHERE, only the outmost one is stored. */
7197 if (mask == NULL) /* outmost WHERE */
7199 else /* inner WHERE */
7206 /* Check if the mask-expr has a consistent shape with the
7207 outmost WHERE mask-expr. */
7208 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7209 gfc_error ("WHERE mask at %L has inconsistent shape",
7210 &cblock->expr1->where);
7213 /* the assignment statement of a WHERE statement, or the first
7214 statement in where-body-construct of a WHERE construct */
7215 cnext = cblock->next;
7220 /* WHERE assignment statement */
7223 /* Check shape consistent for WHERE assignment target. */
7224 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7225 gfc_error ("WHERE assignment target at %L has "
7226 "inconsistent shape", &cnext->expr1->where);
7230 case EXEC_ASSIGN_CALL:
7231 resolve_call (cnext);
7232 if (!cnext->resolved_sym->attr.elemental)
7233 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7234 &cnext->ext.actual->expr->where);
7237 /* WHERE or WHERE construct is part of a where-body-construct */
7239 resolve_where (cnext, e);
7243 gfc_error ("Unsupported statement inside WHERE at %L",
7246 /* the next statement within the same where-body-construct */
7247 cnext = cnext->next;
7249 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7250 cblock = cblock->block;
7255 /* Resolve assignment in FORALL construct.
7256 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7257 FORALL index variables. */
7260 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7264 for (n = 0; n < nvar; n++)
7266 gfc_symbol *forall_index;
7268 forall_index = var_expr[n]->symtree->n.sym;
7270 /* Check whether the assignment target is one of the FORALL index
7272 if ((code->expr1->expr_type == EXPR_VARIABLE)
7273 && (code->expr1->symtree->n.sym == forall_index))
7274 gfc_error ("Assignment to a FORALL index variable at %L",
7275 &code->expr1->where);
7278 /* If one of the FORALL index variables doesn't appear in the
7279 assignment variable, then there could be a many-to-one
7280 assignment. Emit a warning rather than an error because the
7281 mask could be resolving this problem. */
7282 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7283 gfc_warning ("The FORALL with index '%s' is not used on the "
7284 "left side of the assignment at %L and so might "
7285 "cause multiple assignment to this object",
7286 var_expr[n]->symtree->name, &code->expr1->where);
7292 /* Resolve WHERE statement in FORALL construct. */
7295 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7296 gfc_expr **var_expr)
7301 cblock = code->block;
7304 /* the assignment statement of a WHERE statement, or the first
7305 statement in where-body-construct of a WHERE construct */
7306 cnext = cblock->next;
7311 /* WHERE assignment statement */
7313 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7316 /* WHERE operator assignment statement */
7317 case EXEC_ASSIGN_CALL:
7318 resolve_call (cnext);
7319 if (!cnext->resolved_sym->attr.elemental)
7320 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7321 &cnext->ext.actual->expr->where);
7324 /* WHERE or WHERE construct is part of a where-body-construct */
7326 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7330 gfc_error ("Unsupported statement inside WHERE at %L",
7333 /* the next statement within the same where-body-construct */
7334 cnext = cnext->next;
7336 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7337 cblock = cblock->block;
7342 /* Traverse the FORALL body to check whether the following errors exist:
7343 1. For assignment, check if a many-to-one assignment happens.
7344 2. For WHERE statement, check the WHERE body to see if there is any
7345 many-to-one assignment. */
7348 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7352 c = code->block->next;
7358 case EXEC_POINTER_ASSIGN:
7359 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7362 case EXEC_ASSIGN_CALL:
7366 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7367 there is no need to handle it here. */
7371 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7376 /* The next statement in the FORALL body. */
7382 /* Counts the number of iterators needed inside a forall construct, including
7383 nested forall constructs. This is used to allocate the needed memory
7384 in gfc_resolve_forall. */
7387 gfc_count_forall_iterators (gfc_code *code)
7389 int max_iters, sub_iters, current_iters;
7390 gfc_forall_iterator *fa;
7392 gcc_assert(code->op == EXEC_FORALL);
7396 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7399 code = code->block->next;
7403 if (code->op == EXEC_FORALL)
7405 sub_iters = gfc_count_forall_iterators (code);
7406 if (sub_iters > max_iters)
7407 max_iters = sub_iters;
7412 return current_iters + max_iters;
7416 /* Given a FORALL construct, first resolve the FORALL iterator, then call
7417 gfc_resolve_forall_body to resolve the FORALL body. */
7420 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
7422 static gfc_expr **var_expr;
7423 static int total_var = 0;
7424 static int nvar = 0;
7426 gfc_forall_iterator *fa;
7431 /* Start to resolve a FORALL construct */
7432 if (forall_save == 0)
7434 /* Count the total number of FORALL index in the nested FORALL
7435 construct in order to allocate the VAR_EXPR with proper size. */
7436 total_var = gfc_count_forall_iterators (code);
7438 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
7439 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
7442 /* The information about FORALL iterator, including FORALL index start, end
7443 and stride. The FORALL index can not appear in start, end or stride. */
7444 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7446 /* Check if any outer FORALL index name is the same as the current
7448 for (i = 0; i < nvar; i++)
7450 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
7452 gfc_error ("An outer FORALL construct already has an index "
7453 "with this name %L", &fa->var->where);
7457 /* Record the current FORALL index. */
7458 var_expr[nvar] = gfc_copy_expr (fa->var);
7462 /* No memory leak. */
7463 gcc_assert (nvar <= total_var);
7466 /* Resolve the FORALL body. */
7467 gfc_resolve_forall_body (code, nvar, var_expr);
7469 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
7470 gfc_resolve_blocks (code->block, ns);
7474 /* Free only the VAR_EXPRs allocated in this frame. */
7475 for (i = nvar; i < tmp; i++)
7476 gfc_free_expr (var_expr[i]);
7480 /* We are in the outermost FORALL construct. */
7481 gcc_assert (forall_save == 0);
7483 /* VAR_EXPR is not needed any more. */
7484 gfc_free (var_expr);
7490 /* Resolve a BLOCK construct statement. */
7493 resolve_block_construct (gfc_code* code)
7495 /* Eventually, we may want to do some checks here or handle special stuff.
7496 But so far the only thing we can do is resolving the local namespace. */
7498 gfc_resolve (code->ext.ns);
7502 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
7505 static void resolve_code (gfc_code *, gfc_namespace *);
7508 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
7512 for (; b; b = b->block)
7514 t = gfc_resolve_expr (b->expr1);
7515 if (gfc_resolve_expr (b->expr2) == FAILURE)
7521 if (t == SUCCESS && b->expr1 != NULL
7522 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
7523 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7530 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
7531 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
7536 resolve_branch (b->label1, b);
7540 resolve_block_construct (b);
7544 case EXEC_SELECT_TYPE:
7554 case EXEC_OMP_ATOMIC:
7555 case EXEC_OMP_CRITICAL:
7557 case EXEC_OMP_MASTER:
7558 case EXEC_OMP_ORDERED:
7559 case EXEC_OMP_PARALLEL:
7560 case EXEC_OMP_PARALLEL_DO:
7561 case EXEC_OMP_PARALLEL_SECTIONS:
7562 case EXEC_OMP_PARALLEL_WORKSHARE:
7563 case EXEC_OMP_SECTIONS:
7564 case EXEC_OMP_SINGLE:
7566 case EXEC_OMP_TASKWAIT:
7567 case EXEC_OMP_WORKSHARE:
7571 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
7574 resolve_code (b->next, ns);
7579 /* Does everything to resolve an ordinary assignment. Returns true
7580 if this is an interface assignment. */
7582 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
7592 if (gfc_extend_assign (code, ns) == SUCCESS)
7594 gfc_symbol* assign_proc;
7597 if (code->op == EXEC_ASSIGN_CALL)
7599 lhs = code->ext.actual->expr;
7600 rhsptr = &code->ext.actual->next->expr;
7601 assign_proc = code->symtree->n.sym;
7605 gfc_actual_arglist* args;
7606 gfc_typebound_proc* tbp;
7608 gcc_assert (code->op == EXEC_COMPCALL);
7610 args = code->expr1->value.compcall.actual;
7612 rhsptr = &args->next->expr;
7614 tbp = code->expr1->value.compcall.tbp;
7615 gcc_assert (!tbp->is_generic);
7616 assign_proc = tbp->u.specific->n.sym;
7619 /* Make a temporary rhs when there is a default initializer
7620 and rhs is the same symbol as the lhs. */
7621 if ((*rhsptr)->expr_type == EXPR_VARIABLE
7622 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
7623 && has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
7624 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
7625 *rhsptr = gfc_get_parentheses (*rhsptr);
7634 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
7635 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
7636 &code->loc) == FAILURE)
7639 /* Handle the case of a BOZ literal on the RHS. */
7640 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
7643 if (gfc_option.warn_surprising)
7644 gfc_warning ("BOZ literal at %L is bitwise transferred "
7645 "non-integer symbol '%s'", &code->loc,
7646 lhs->symtree->n.sym->name);
7648 if (!gfc_convert_boz (rhs, &lhs->ts))
7650 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
7652 if (rc == ARITH_UNDERFLOW)
7653 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
7654 ". This check can be disabled with the option "
7655 "-fno-range-check", &rhs->where);
7656 else if (rc == ARITH_OVERFLOW)
7657 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
7658 ". This check can be disabled with the option "
7659 "-fno-range-check", &rhs->where);
7660 else if (rc == ARITH_NAN)
7661 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
7662 ". This check can be disabled with the option "
7663 "-fno-range-check", &rhs->where);
7669 if (lhs->ts.type == BT_CHARACTER
7670 && gfc_option.warn_character_truncation)
7672 if (lhs->ts.u.cl != NULL
7673 && lhs->ts.u.cl->length != NULL
7674 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7675 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
7677 if (rhs->expr_type == EXPR_CONSTANT)
7678 rlen = rhs->value.character.length;
7680 else if (rhs->ts.u.cl != NULL
7681 && rhs->ts.u.cl->length != NULL
7682 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7683 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
7685 if (rlen && llen && rlen > llen)
7686 gfc_warning_now ("CHARACTER expression will be truncated "
7687 "in assignment (%d/%d) at %L",
7688 llen, rlen, &code->loc);
7691 /* Ensure that a vector index expression for the lvalue is evaluated
7692 to a temporary if the lvalue symbol is referenced in it. */
7695 for (ref = lhs->ref; ref; ref= ref->next)
7696 if (ref->type == REF_ARRAY)
7698 for (n = 0; n < ref->u.ar.dimen; n++)
7699 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
7700 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
7701 ref->u.ar.start[n]))
7703 = gfc_get_parentheses (ref->u.ar.start[n]);
7707 if (gfc_pure (NULL))
7709 if (gfc_impure_variable (lhs->symtree->n.sym))
7711 gfc_error ("Cannot assign to variable '%s' in PURE "
7713 lhs->symtree->n.sym->name,
7718 if (lhs->ts.type == BT_DERIVED
7719 && lhs->expr_type == EXPR_VARIABLE
7720 && lhs->ts.u.derived->attr.pointer_comp
7721 && gfc_impure_variable (rhs->symtree->n.sym))
7723 gfc_error ("The impure variable at %L is assigned to "
7724 "a derived type variable with a POINTER "
7725 "component in a PURE procedure (12.6)",
7732 if (lhs->ts.type == BT_CLASS)
7734 gfc_error ("Variable must not be polymorphic in assignment at %L",
7739 gfc_check_assign (lhs, rhs, 1);
7744 /* Given a block of code, recursively resolve everything pointed to by this
7748 resolve_code (gfc_code *code, gfc_namespace *ns)
7750 int omp_workshare_save;
7755 frame.prev = cs_base;
7759 find_reachable_labels (code);
7761 for (; code; code = code->next)
7763 frame.current = code;
7764 forall_save = forall_flag;
7766 if (code->op == EXEC_FORALL)
7769 gfc_resolve_forall (code, ns, forall_save);
7772 else if (code->block)
7774 omp_workshare_save = -1;
7777 case EXEC_OMP_PARALLEL_WORKSHARE:
7778 omp_workshare_save = omp_workshare_flag;
7779 omp_workshare_flag = 1;
7780 gfc_resolve_omp_parallel_blocks (code, ns);
7782 case EXEC_OMP_PARALLEL:
7783 case EXEC_OMP_PARALLEL_DO:
7784 case EXEC_OMP_PARALLEL_SECTIONS:
7786 omp_workshare_save = omp_workshare_flag;
7787 omp_workshare_flag = 0;
7788 gfc_resolve_omp_parallel_blocks (code, ns);
7791 gfc_resolve_omp_do_blocks (code, ns);
7793 case EXEC_OMP_WORKSHARE:
7794 omp_workshare_save = omp_workshare_flag;
7795 omp_workshare_flag = 1;
7798 gfc_resolve_blocks (code->block, ns);
7802 if (omp_workshare_save != -1)
7803 omp_workshare_flag = omp_workshare_save;
7807 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
7808 t = gfc_resolve_expr (code->expr1);
7809 forall_flag = forall_save;
7811 if (gfc_resolve_expr (code->expr2) == FAILURE)
7814 if (code->op == EXEC_ALLOCATE
7815 && gfc_resolve_expr (code->expr3) == FAILURE)
7821 case EXEC_END_BLOCK:
7828 case EXEC_ASSIGN_CALL:
7832 /* Keep track of which entry we are up to. */
7833 current_entry_id = code->ext.entry->id;
7837 resolve_where (code, NULL);
7841 if (code->expr1 != NULL)
7843 if (code->expr1->ts.type != BT_INTEGER)
7844 gfc_error ("ASSIGNED GOTO statement at %L requires an "
7845 "INTEGER variable", &code->expr1->where);
7846 else if (code->expr1->symtree->n.sym->attr.assign != 1)
7847 gfc_error ("Variable '%s' has not been assigned a target "
7848 "label at %L", code->expr1->symtree->n.sym->name,
7849 &code->expr1->where);
7852 resolve_branch (code->label1, code);
7856 if (code->expr1 != NULL
7857 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
7858 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
7859 "INTEGER return specifier", &code->expr1->where);
7862 case EXEC_INIT_ASSIGN:
7863 case EXEC_END_PROCEDURE:
7870 if (resolve_ordinary_assign (code, ns))
7872 if (code->op == EXEC_COMPCALL)
7879 case EXEC_LABEL_ASSIGN:
7880 if (code->label1->defined == ST_LABEL_UNKNOWN)
7881 gfc_error ("Label %d referenced at %L is never defined",
7882 code->label1->value, &code->label1->where);
7884 && (code->expr1->expr_type != EXPR_VARIABLE
7885 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
7886 || code->expr1->symtree->n.sym->ts.kind
7887 != gfc_default_integer_kind
7888 || code->expr1->symtree->n.sym->as != NULL))
7889 gfc_error ("ASSIGN statement at %L requires a scalar "
7890 "default INTEGER variable", &code->expr1->where);
7893 case EXEC_POINTER_ASSIGN:
7897 gfc_check_pointer_assign (code->expr1, code->expr2);
7900 case EXEC_ARITHMETIC_IF:
7902 && code->expr1->ts.type != BT_INTEGER
7903 && code->expr1->ts.type != BT_REAL)
7904 gfc_error ("Arithmetic IF statement at %L requires a numeric "
7905 "expression", &code->expr1->where);
7907 resolve_branch (code->label1, code);
7908 resolve_branch (code->label2, code);
7909 resolve_branch (code->label3, code);
7913 if (t == SUCCESS && code->expr1 != NULL
7914 && (code->expr1->ts.type != BT_LOGICAL
7915 || code->expr1->rank != 0))
7916 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7917 &code->expr1->where);
7922 resolve_call (code);
7927 if (code->expr1->symtree
7928 && code->expr1->symtree->n.sym->ts.type == BT_CLASS)
7929 resolve_class_typebound_call (code);
7931 resolve_typebound_call (code);
7935 resolve_ppc_call (code);
7939 /* Select is complicated. Also, a SELECT construct could be
7940 a transformed computed GOTO. */
7941 resolve_select (code);
7944 case EXEC_SELECT_TYPE:
7945 resolve_select_type (code);
7949 gfc_resolve (code->ext.ns);
7953 if (code->ext.iterator != NULL)
7955 gfc_iterator *iter = code->ext.iterator;
7956 if (gfc_resolve_iterator (iter, true) != FAILURE)
7957 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
7962 if (code->expr1 == NULL)
7963 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
7965 && (code->expr1->rank != 0
7966 || code->expr1->ts.type != BT_LOGICAL))
7967 gfc_error ("Exit condition of DO WHILE loop at %L must be "
7968 "a scalar LOGICAL expression", &code->expr1->where);
7973 resolve_allocate_deallocate (code, "ALLOCATE");
7977 case EXEC_DEALLOCATE:
7979 resolve_allocate_deallocate (code, "DEALLOCATE");
7984 if (gfc_resolve_open (code->ext.open) == FAILURE)
7987 resolve_branch (code->ext.open->err, code);
7991 if (gfc_resolve_close (code->ext.close) == FAILURE)
7994 resolve_branch (code->ext.close->err, code);
7997 case EXEC_BACKSPACE:
8001 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8004 resolve_branch (code->ext.filepos->err, code);
8008 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8011 resolve_branch (code->ext.inquire->err, code);
8015 gcc_assert (code->ext.inquire != NULL);
8016 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8019 resolve_branch (code->ext.inquire->err, code);
8023 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8026 resolve_branch (code->ext.wait->err, code);
8027 resolve_branch (code->ext.wait->end, code);
8028 resolve_branch (code->ext.wait->eor, code);
8033 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8036 resolve_branch (code->ext.dt->err, code);
8037 resolve_branch (code->ext.dt->end, code);
8038 resolve_branch (code->ext.dt->eor, code);
8042 resolve_transfer (code);
8046 resolve_forall_iterators (code->ext.forall_iterator);
8048 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8049 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8050 "expression", &code->expr1->where);
8053 case EXEC_OMP_ATOMIC:
8054 case EXEC_OMP_BARRIER:
8055 case EXEC_OMP_CRITICAL:
8056 case EXEC_OMP_FLUSH:
8058 case EXEC_OMP_MASTER:
8059 case EXEC_OMP_ORDERED:
8060 case EXEC_OMP_SECTIONS:
8061 case EXEC_OMP_SINGLE:
8062 case EXEC_OMP_TASKWAIT:
8063 case EXEC_OMP_WORKSHARE:
8064 gfc_resolve_omp_directive (code, ns);
8067 case EXEC_OMP_PARALLEL:
8068 case EXEC_OMP_PARALLEL_DO:
8069 case EXEC_OMP_PARALLEL_SECTIONS:
8070 case EXEC_OMP_PARALLEL_WORKSHARE:
8072 omp_workshare_save = omp_workshare_flag;
8073 omp_workshare_flag = 0;
8074 gfc_resolve_omp_directive (code, ns);
8075 omp_workshare_flag = omp_workshare_save;
8079 gfc_internal_error ("resolve_code(): Bad statement code");
8083 cs_base = frame.prev;
8087 /* Resolve initial values and make sure they are compatible with
8091 resolve_values (gfc_symbol *sym)
8093 if (sym->value == NULL)
8096 if (gfc_resolve_expr (sym->value) == FAILURE)
8099 gfc_check_assign_symbol (sym, sym->value);
8103 /* Verify the binding labels for common blocks that are BIND(C). The label
8104 for a BIND(C) common block must be identical in all scoping units in which
8105 the common block is declared. Further, the binding label can not collide
8106 with any other global entity in the program. */
8109 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8111 if (comm_block_tree->n.common->is_bind_c == 1)
8113 gfc_gsymbol *binding_label_gsym;
8114 gfc_gsymbol *comm_name_gsym;
8116 /* See if a global symbol exists by the common block's name. It may
8117 be NULL if the common block is use-associated. */
8118 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8119 comm_block_tree->n.common->name);
8120 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8121 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8122 "with the global entity '%s' at %L",
8123 comm_block_tree->n.common->binding_label,
8124 comm_block_tree->n.common->name,
8125 &(comm_block_tree->n.common->where),
8126 comm_name_gsym->name, &(comm_name_gsym->where));
8127 else if (comm_name_gsym != NULL
8128 && strcmp (comm_name_gsym->name,
8129 comm_block_tree->n.common->name) == 0)
8131 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8133 if (comm_name_gsym->binding_label == NULL)
8134 /* No binding label for common block stored yet; save this one. */
8135 comm_name_gsym->binding_label =
8136 comm_block_tree->n.common->binding_label;
8138 if (strcmp (comm_name_gsym->binding_label,
8139 comm_block_tree->n.common->binding_label) != 0)
8141 /* Common block names match but binding labels do not. */
8142 gfc_error ("Binding label '%s' for common block '%s' at %L "
8143 "does not match the binding label '%s' for common "
8145 comm_block_tree->n.common->binding_label,
8146 comm_block_tree->n.common->name,
8147 &(comm_block_tree->n.common->where),
8148 comm_name_gsym->binding_label,
8149 comm_name_gsym->name,
8150 &(comm_name_gsym->where));
8155 /* There is no binding label (NAME="") so we have nothing further to
8156 check and nothing to add as a global symbol for the label. */
8157 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8160 binding_label_gsym =
8161 gfc_find_gsymbol (gfc_gsym_root,
8162 comm_block_tree->n.common->binding_label);
8163 if (binding_label_gsym == NULL)
8165 /* Need to make a global symbol for the binding label to prevent
8166 it from colliding with another. */
8167 binding_label_gsym =
8168 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8169 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8170 binding_label_gsym->type = GSYM_COMMON;
8174 /* If comm_name_gsym is NULL, the name common block is use
8175 associated and the name could be colliding. */
8176 if (binding_label_gsym->type != GSYM_COMMON)
8177 gfc_error ("Binding label '%s' for common block '%s' at %L "
8178 "collides with the global entity '%s' at %L",
8179 comm_block_tree->n.common->binding_label,
8180 comm_block_tree->n.common->name,
8181 &(comm_block_tree->n.common->where),
8182 binding_label_gsym->name,
8183 &(binding_label_gsym->where));
8184 else if (comm_name_gsym != NULL
8185 && (strcmp (binding_label_gsym->name,
8186 comm_name_gsym->binding_label) != 0)
8187 && (strcmp (binding_label_gsym->sym_name,
8188 comm_name_gsym->name) != 0))
8189 gfc_error ("Binding label '%s' for common block '%s' at %L "
8190 "collides with global entity '%s' at %L",
8191 binding_label_gsym->name, binding_label_gsym->sym_name,
8192 &(comm_block_tree->n.common->where),
8193 comm_name_gsym->name, &(comm_name_gsym->where));
8201 /* Verify any BIND(C) derived types in the namespace so we can report errors
8202 for them once, rather than for each variable declared of that type. */
8205 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8207 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8208 && derived_sym->attr.is_bind_c == 1)
8209 verify_bind_c_derived_type (derived_sym);
8215 /* Verify that any binding labels used in a given namespace do not collide
8216 with the names or binding labels of any global symbols. */
8219 gfc_verify_binding_labels (gfc_symbol *sym)
8223 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8224 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8226 gfc_gsymbol *bind_c_sym;
8228 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8229 if (bind_c_sym != NULL
8230 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8232 if (sym->attr.if_source == IFSRC_DECL
8233 && (bind_c_sym->type != GSYM_SUBROUTINE
8234 && bind_c_sym->type != GSYM_FUNCTION)
8235 && ((sym->attr.contained == 1
8236 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8237 || (sym->attr.use_assoc == 1
8238 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8240 /* Make sure global procedures don't collide with anything. */
8241 gfc_error ("Binding label '%s' at %L collides with the global "
8242 "entity '%s' at %L", sym->binding_label,
8243 &(sym->declared_at), bind_c_sym->name,
8244 &(bind_c_sym->where));
8247 else if (sym->attr.contained == 0
8248 && (sym->attr.if_source == IFSRC_IFBODY
8249 && sym->attr.flavor == FL_PROCEDURE)
8250 && (bind_c_sym->sym_name != NULL
8251 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8253 /* Make sure procedures in interface bodies don't collide. */
8254 gfc_error ("Binding label '%s' in interface body at %L collides "
8255 "with the global entity '%s' at %L",
8257 &(sym->declared_at), bind_c_sym->name,
8258 &(bind_c_sym->where));
8261 else if (sym->attr.contained == 0
8262 && sym->attr.if_source == IFSRC_UNKNOWN)
8263 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8264 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8265 || sym->attr.use_assoc == 0)
8267 gfc_error ("Binding label '%s' at %L collides with global "
8268 "entity '%s' at %L", sym->binding_label,
8269 &(sym->declared_at), bind_c_sym->name,
8270 &(bind_c_sym->where));
8275 /* Clear the binding label to prevent checking multiple times. */
8276 sym->binding_label[0] = '\0';
8278 else if (bind_c_sym == NULL)
8280 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8281 bind_c_sym->where = sym->declared_at;
8282 bind_c_sym->sym_name = sym->name;
8284 if (sym->attr.use_assoc == 1)
8285 bind_c_sym->mod_name = sym->module;
8287 if (sym->ns->proc_name != NULL)
8288 bind_c_sym->mod_name = sym->ns->proc_name->name;
8290 if (sym->attr.contained == 0)
8292 if (sym->attr.subroutine)
8293 bind_c_sym->type = GSYM_SUBROUTINE;
8294 else if (sym->attr.function)
8295 bind_c_sym->type = GSYM_FUNCTION;
8303 /* Resolve an index expression. */
8306 resolve_index_expr (gfc_expr *e)
8308 if (gfc_resolve_expr (e) == FAILURE)
8311 if (gfc_simplify_expr (e, 0) == FAILURE)
8314 if (gfc_specification_expr (e) == FAILURE)
8320 /* Resolve a charlen structure. */
8323 resolve_charlen (gfc_charlen *cl)
8332 specification_expr = 1;
8334 if (resolve_index_expr (cl->length) == FAILURE)
8336 specification_expr = 0;
8340 /* "If the character length parameter value evaluates to a negative
8341 value, the length of character entities declared is zero." */
8342 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8344 gfc_warning_now ("CHARACTER variable has zero length at %L",
8345 &cl->length->where);
8346 gfc_replace_expr (cl->length, gfc_int_expr (0));
8349 /* Check that the character length is not too large. */
8350 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8351 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8352 && cl->length->ts.type == BT_INTEGER
8353 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8355 gfc_error ("String length at %L is too large", &cl->length->where);
8363 /* Test for non-constant shape arrays. */
8366 is_non_constant_shape_array (gfc_symbol *sym)
8372 not_constant = false;
8373 if (sym->as != NULL)
8375 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
8376 has not been simplified; parameter array references. Do the
8377 simplification now. */
8378 for (i = 0; i < sym->as->rank; i++)
8380 e = sym->as->lower[i];
8381 if (e && (resolve_index_expr (e) == FAILURE
8382 || !gfc_is_constant_expr (e)))
8383 not_constant = true;
8385 e = sym->as->upper[i];
8386 if (e && (resolve_index_expr (e) == FAILURE
8387 || !gfc_is_constant_expr (e)))
8388 not_constant = true;
8391 return not_constant;
8394 /* Given a symbol and an initialization expression, add code to initialize
8395 the symbol to the function entry. */
8397 build_init_assign (gfc_symbol *sym, gfc_expr *init)
8401 gfc_namespace *ns = sym->ns;
8403 /* Search for the function namespace if this is a contained
8404 function without an explicit result. */
8405 if (sym->attr.function && sym == sym->result
8406 && sym->name != sym->ns->proc_name->name)
8409 for (;ns; ns = ns->sibling)
8410 if (strcmp (ns->proc_name->name, sym->name) == 0)
8416 gfc_free_expr (init);
8420 /* Build an l-value expression for the result. */
8421 lval = gfc_lval_expr_from_sym (sym);
8423 /* Add the code at scope entry. */
8424 init_st = gfc_get_code ();
8425 init_st->next = ns->code;
8428 /* Assign the default initializer to the l-value. */
8429 init_st->loc = sym->declared_at;
8430 init_st->op = EXEC_INIT_ASSIGN;
8431 init_st->expr1 = lval;
8432 init_st->expr2 = init;
8435 /* Assign the default initializer to a derived type variable or result. */
8438 apply_default_init (gfc_symbol *sym)
8440 gfc_expr *init = NULL;
8442 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8445 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
8446 init = gfc_default_initializer (&sym->ts);
8451 build_init_assign (sym, init);
8454 /* Build an initializer for a local integer, real, complex, logical, or
8455 character variable, based on the command line flags finit-local-zero,
8456 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
8457 null if the symbol should not have a default initialization. */
8459 build_default_init_expr (gfc_symbol *sym)
8462 gfc_expr *init_expr;
8465 /* These symbols should never have a default initialization. */
8466 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
8467 || sym->attr.external
8469 || sym->attr.pointer
8470 || sym->attr.in_equivalence
8471 || sym->attr.in_common
8474 || sym->attr.cray_pointee
8475 || sym->attr.cray_pointer)
8478 /* Now we'll try to build an initializer expression. */
8479 init_expr = gfc_get_expr ();
8480 init_expr->expr_type = EXPR_CONSTANT;
8481 init_expr->ts.type = sym->ts.type;
8482 init_expr->ts.kind = sym->ts.kind;
8483 init_expr->where = sym->declared_at;
8485 /* We will only initialize integers, reals, complex, logicals, and
8486 characters, and only if the corresponding command-line flags
8487 were set. Otherwise, we free init_expr and return null. */
8488 switch (sym->ts.type)
8491 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
8492 mpz_init_set_si (init_expr->value.integer,
8493 gfc_option.flag_init_integer_value);
8496 gfc_free_expr (init_expr);
8502 mpfr_init (init_expr->value.real);
8503 switch (gfc_option.flag_init_real)
8505 case GFC_INIT_REAL_SNAN:
8506 init_expr->is_snan = 1;
8508 case GFC_INIT_REAL_NAN:
8509 mpfr_set_nan (init_expr->value.real);
8512 case GFC_INIT_REAL_INF:
8513 mpfr_set_inf (init_expr->value.real, 1);
8516 case GFC_INIT_REAL_NEG_INF:
8517 mpfr_set_inf (init_expr->value.real, -1);
8520 case GFC_INIT_REAL_ZERO:
8521 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
8525 gfc_free_expr (init_expr);
8533 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
8535 mpfr_init (init_expr->value.complex.r);
8536 mpfr_init (init_expr->value.complex.i);
8538 switch (gfc_option.flag_init_real)
8540 case GFC_INIT_REAL_SNAN:
8541 init_expr->is_snan = 1;
8543 case GFC_INIT_REAL_NAN:
8544 mpfr_set_nan (mpc_realref (init_expr->value.complex));
8545 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
8548 case GFC_INIT_REAL_INF:
8549 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
8550 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
8553 case GFC_INIT_REAL_NEG_INF:
8554 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
8555 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
8558 case GFC_INIT_REAL_ZERO:
8560 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
8562 mpfr_set_ui (init_expr->value.complex.r, 0.0, GFC_RND_MODE);
8563 mpfr_set_ui (init_expr->value.complex.i, 0.0, GFC_RND_MODE);
8568 gfc_free_expr (init_expr);
8575 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
8576 init_expr->value.logical = 0;
8577 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
8578 init_expr->value.logical = 1;
8581 gfc_free_expr (init_expr);
8587 /* For characters, the length must be constant in order to
8588 create a default initializer. */
8589 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
8590 && sym->ts.u.cl->length
8591 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8593 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
8594 init_expr->value.character.length = char_len;
8595 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
8596 for (i = 0; i < char_len; i++)
8597 init_expr->value.character.string[i]
8598 = (unsigned char) gfc_option.flag_init_character_value;
8602 gfc_free_expr (init_expr);
8608 gfc_free_expr (init_expr);
8614 /* Add an initialization expression to a local variable. */
8616 apply_default_init_local (gfc_symbol *sym)
8618 gfc_expr *init = NULL;
8620 /* The symbol should be a variable or a function return value. */
8621 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8622 || (sym->attr.function && sym->result != sym))
8625 /* Try to build the initializer expression. If we can't initialize
8626 this symbol, then init will be NULL. */
8627 init = build_default_init_expr (sym);
8631 /* For saved variables, we don't want to add an initializer at
8632 function entry, so we just add a static initializer. */
8633 if (sym->attr.save || sym->ns->save_all
8634 || gfc_option.flag_max_stack_var_size == 0)
8636 /* Don't clobber an existing initializer! */
8637 gcc_assert (sym->value == NULL);
8642 build_init_assign (sym, init);
8645 /* Resolution of common features of flavors variable and procedure. */
8648 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
8650 /* Constraints on deferred shape variable. */
8651 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
8653 if (sym->attr.allocatable)
8655 if (sym->attr.dimension)
8657 gfc_error ("Allocatable array '%s' at %L must have "
8658 "a deferred shape", sym->name, &sym->declared_at);
8661 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
8662 "may not be ALLOCATABLE", sym->name,
8663 &sym->declared_at) == FAILURE)
8667 if (sym->attr.pointer && sym->attr.dimension)
8669 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
8670 sym->name, &sym->declared_at);
8677 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
8678 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
8680 gfc_error ("Array '%s' at %L cannot have a deferred shape",
8681 sym->name, &sym->declared_at);
8689 /* Additional checks for symbols with flavor variable and derived
8690 type. To be called from resolve_fl_variable. */
8693 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
8695 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
8697 /* Check to see if a derived type is blocked from being host
8698 associated by the presence of another class I symbol in the same
8699 namespace. 14.6.1.3 of the standard and the discussion on
8700 comp.lang.fortran. */
8701 if (sym->ns != sym->ts.u.derived->ns
8702 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
8705 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
8706 if (s && s->attr.flavor != FL_DERIVED)
8708 gfc_error ("The type '%s' cannot be host associated at %L "
8709 "because it is blocked by an incompatible object "
8710 "of the same name declared at %L",
8711 sym->ts.u.derived->name, &sym->declared_at,
8717 /* 4th constraint in section 11.3: "If an object of a type for which
8718 component-initialization is specified (R429) appears in the
8719 specification-part of a module and does not have the ALLOCATABLE
8720 or POINTER attribute, the object shall have the SAVE attribute."
8722 The check for initializers is performed with
8723 has_default_initializer because gfc_default_initializer generates
8724 a hidden default for allocatable components. */
8725 if (!(sym->value || no_init_flag) && sym->ns->proc_name
8726 && sym->ns->proc_name->attr.flavor == FL_MODULE
8727 && !sym->ns->save_all && !sym->attr.save
8728 && !sym->attr.pointer && !sym->attr.allocatable
8729 && has_default_initializer (sym->ts.u.derived))
8731 gfc_error("Object '%s' at %L must have the SAVE attribute for "
8732 "default initialization of a component",
8733 sym->name, &sym->declared_at);
8737 if (sym->ts.type == BT_CLASS)
8740 if (!gfc_type_is_extensible (sym->ts.u.derived->components->ts.u.derived))
8742 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
8743 sym->ts.u.derived->name, sym->name, &sym->declared_at);
8748 /* Assume that use associated symbols were checked in the module ns. */
8749 if (!sym->attr.class_ok && !sym->attr.use_assoc)
8751 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
8752 "or pointer", sym->name, &sym->declared_at);
8757 /* Assign default initializer. */
8758 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
8759 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
8761 sym->value = gfc_default_initializer (&sym->ts);
8768 /* Resolve symbols with flavor variable. */
8771 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
8773 int no_init_flag, automatic_flag;
8775 const char *auto_save_msg;
8777 auto_save_msg = "Automatic object '%s' at %L cannot have the "
8780 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8783 /* Set this flag to check that variables are parameters of all entries.
8784 This check is effected by the call to gfc_resolve_expr through
8785 is_non_constant_shape_array. */
8786 specification_expr = 1;
8788 if (sym->ns->proc_name
8789 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8790 || sym->ns->proc_name->attr.is_main_program)
8791 && !sym->attr.use_assoc
8792 && !sym->attr.allocatable
8793 && !sym->attr.pointer
8794 && is_non_constant_shape_array (sym))
8796 /* The shape of a main program or module array needs to be
8798 gfc_error ("The module or main program array '%s' at %L must "
8799 "have constant shape", sym->name, &sym->declared_at);
8800 specification_expr = 0;
8804 if (sym->ts.type == BT_CHARACTER)
8806 /* Make sure that character string variables with assumed length are
8808 e = sym->ts.u.cl->length;
8809 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
8811 gfc_error ("Entity with assumed character length at %L must be a "
8812 "dummy argument or a PARAMETER", &sym->declared_at);
8816 if (e && sym->attr.save && !gfc_is_constant_expr (e))
8818 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8822 if (!gfc_is_constant_expr (e)
8823 && !(e->expr_type == EXPR_VARIABLE
8824 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
8825 && sym->ns->proc_name
8826 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8827 || sym->ns->proc_name->attr.is_main_program)
8828 && !sym->attr.use_assoc)
8830 gfc_error ("'%s' at %L must have constant character length "
8831 "in this context", sym->name, &sym->declared_at);
8836 if (sym->value == NULL && sym->attr.referenced)
8837 apply_default_init_local (sym); /* Try to apply a default initialization. */
8839 /* Determine if the symbol may not have an initializer. */
8840 no_init_flag = automatic_flag = 0;
8841 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
8842 || sym->attr.intrinsic || sym->attr.result)
8844 else if (sym->attr.dimension && !sym->attr.pointer
8845 && is_non_constant_shape_array (sym))
8847 no_init_flag = automatic_flag = 1;
8849 /* Also, they must not have the SAVE attribute.
8850 SAVE_IMPLICIT is checked below. */
8851 if (sym->attr.save == SAVE_EXPLICIT)
8853 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8858 /* Ensure that any initializer is simplified. */
8860 gfc_simplify_expr (sym->value, 1);
8862 /* Reject illegal initializers. */
8863 if (!sym->mark && sym->value)
8865 if (sym->attr.allocatable)
8866 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
8867 sym->name, &sym->declared_at);
8868 else if (sym->attr.external)
8869 gfc_error ("External '%s' at %L cannot have an initializer",
8870 sym->name, &sym->declared_at);
8871 else if (sym->attr.dummy
8872 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
8873 gfc_error ("Dummy '%s' at %L cannot have an initializer",
8874 sym->name, &sym->declared_at);
8875 else if (sym->attr.intrinsic)
8876 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
8877 sym->name, &sym->declared_at);
8878 else if (sym->attr.result)
8879 gfc_error ("Function result '%s' at %L cannot have an initializer",
8880 sym->name, &sym->declared_at);
8881 else if (automatic_flag)
8882 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
8883 sym->name, &sym->declared_at);
8890 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
8891 return resolve_fl_variable_derived (sym, no_init_flag);
8897 /* Resolve a procedure. */
8900 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
8902 gfc_formal_arglist *arg;
8904 if (sym->attr.ambiguous_interfaces && !sym->attr.referenced)
8905 gfc_warning ("Although not referenced, '%s' at %L has ambiguous "
8906 "interfaces", sym->name, &sym->declared_at);
8908 if (sym->attr.function
8909 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8912 if (sym->ts.type == BT_CHARACTER)
8914 gfc_charlen *cl = sym->ts.u.cl;
8916 if (cl && cl->length && gfc_is_constant_expr (cl->length)
8917 && resolve_charlen (cl) == FAILURE)
8920 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
8922 if (sym->attr.proc == PROC_ST_FUNCTION)
8924 gfc_error ("Character-valued statement function '%s' at %L must "
8925 "have constant length", sym->name, &sym->declared_at);
8929 if (sym->attr.external && sym->formal == NULL
8930 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
8932 gfc_error ("Automatic character length function '%s' at %L must "
8933 "have an explicit interface", sym->name,
8940 /* Ensure that derived type for are not of a private type. Internal
8941 module procedures are excluded by 2.2.3.3 - i.e., they are not
8942 externally accessible and can access all the objects accessible in
8944 if (!(sym->ns->parent
8945 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
8946 && gfc_check_access(sym->attr.access, sym->ns->default_access))
8948 gfc_interface *iface;
8950 for (arg = sym->formal; arg; arg = arg->next)
8953 && arg->sym->ts.type == BT_DERIVED
8954 && !arg->sym->ts.u.derived->attr.use_assoc
8955 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
8956 arg->sym->ts.u.derived->ns->default_access)
8957 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
8958 "PRIVATE type and cannot be a dummy argument"
8959 " of '%s', which is PUBLIC at %L",
8960 arg->sym->name, sym->name, &sym->declared_at)
8963 /* Stop this message from recurring. */
8964 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
8969 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8970 PRIVATE to the containing module. */
8971 for (iface = sym->generic; iface; iface = iface->next)
8973 for (arg = iface->sym->formal; arg; arg = arg->next)
8976 && arg->sym->ts.type == BT_DERIVED
8977 && !arg->sym->ts.u.derived->attr.use_assoc
8978 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
8979 arg->sym->ts.u.derived->ns->default_access)
8980 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8981 "'%s' in PUBLIC interface '%s' at %L "
8982 "takes dummy arguments of '%s' which is "
8983 "PRIVATE", iface->sym->name, sym->name,
8984 &iface->sym->declared_at,
8985 gfc_typename (&arg->sym->ts)) == FAILURE)
8987 /* Stop this message from recurring. */
8988 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
8994 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8995 PRIVATE to the containing module. */
8996 for (iface = sym->generic; iface; iface = iface->next)
8998 for (arg = iface->sym->formal; arg; arg = arg->next)
9001 && arg->sym->ts.type == BT_DERIVED
9002 && !arg->sym->ts.u.derived->attr.use_assoc
9003 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9004 arg->sym->ts.u.derived->ns->default_access)
9005 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9006 "'%s' in PUBLIC interface '%s' at %L "
9007 "takes dummy arguments of '%s' which is "
9008 "PRIVATE", iface->sym->name, sym->name,
9009 &iface->sym->declared_at,
9010 gfc_typename (&arg->sym->ts)) == FAILURE)
9012 /* Stop this message from recurring. */
9013 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9020 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9021 && !sym->attr.proc_pointer)
9023 gfc_error ("Function '%s' at %L cannot have an initializer",
9024 sym->name, &sym->declared_at);
9028 /* An external symbol may not have an initializer because it is taken to be
9029 a procedure. Exception: Procedure Pointers. */
9030 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9032 gfc_error ("External object '%s' at %L may not have an initializer",
9033 sym->name, &sym->declared_at);
9037 /* An elemental function is required to return a scalar 12.7.1 */
9038 if (sym->attr.elemental && sym->attr.function && sym->as)
9040 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9041 "result", sym->name, &sym->declared_at);
9042 /* Reset so that the error only occurs once. */
9043 sym->attr.elemental = 0;
9047 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9048 char-len-param shall not be array-valued, pointer-valued, recursive
9049 or pure. ....snip... A character value of * may only be used in the
9050 following ways: (i) Dummy arg of procedure - dummy associates with
9051 actual length; (ii) To declare a named constant; or (iii) External
9052 function - but length must be declared in calling scoping unit. */
9053 if (sym->attr.function
9054 && sym->ts.type == BT_CHARACTER
9055 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9057 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9058 || (sym->attr.recursive) || (sym->attr.pure))
9060 if (sym->as && sym->as->rank)
9061 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9062 "array-valued", sym->name, &sym->declared_at);
9064 if (sym->attr.pointer)
9065 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9066 "pointer-valued", sym->name, &sym->declared_at);
9069 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9070 "pure", sym->name, &sym->declared_at);
9072 if (sym->attr.recursive)
9073 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9074 "recursive", sym->name, &sym->declared_at);
9079 /* Appendix B.2 of the standard. Contained functions give an
9080 error anyway. Fixed-form is likely to be F77/legacy. */
9081 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9082 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9083 "CHARACTER(*) function '%s' at %L",
9084 sym->name, &sym->declared_at);
9087 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9089 gfc_formal_arglist *curr_arg;
9090 int has_non_interop_arg = 0;
9092 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9093 sym->common_block) == FAILURE)
9095 /* Clear these to prevent looking at them again if there was an
9097 sym->attr.is_bind_c = 0;
9098 sym->attr.is_c_interop = 0;
9099 sym->ts.is_c_interop = 0;
9103 /* So far, no errors have been found. */
9104 sym->attr.is_c_interop = 1;
9105 sym->ts.is_c_interop = 1;
9108 curr_arg = sym->formal;
9109 while (curr_arg != NULL)
9111 /* Skip implicitly typed dummy args here. */
9112 if (curr_arg->sym->attr.implicit_type == 0)
9113 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9114 /* If something is found to fail, record the fact so we
9115 can mark the symbol for the procedure as not being
9116 BIND(C) to try and prevent multiple errors being
9118 has_non_interop_arg = 1;
9120 curr_arg = curr_arg->next;
9123 /* See if any of the arguments were not interoperable and if so, clear
9124 the procedure symbol to prevent duplicate error messages. */
9125 if (has_non_interop_arg != 0)
9127 sym->attr.is_c_interop = 0;
9128 sym->ts.is_c_interop = 0;
9129 sym->attr.is_bind_c = 0;
9133 if (!sym->attr.proc_pointer)
9135 if (sym->attr.save == SAVE_EXPLICIT)
9137 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9138 "in '%s' at %L", sym->name, &sym->declared_at);
9141 if (sym->attr.intent)
9143 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9144 "in '%s' at %L", sym->name, &sym->declared_at);
9147 if (sym->attr.subroutine && sym->attr.result)
9149 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9150 "in '%s' at %L", sym->name, &sym->declared_at);
9153 if (sym->attr.external && sym->attr.function
9154 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9155 || sym->attr.contained))
9157 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9158 "in '%s' at %L", sym->name, &sym->declared_at);
9161 if (strcmp ("ppr@", sym->name) == 0)
9163 gfc_error ("Procedure pointer result '%s' at %L "
9164 "is missing the pointer attribute",
9165 sym->ns->proc_name->name, &sym->declared_at);
9174 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9175 been defined and we now know their defined arguments, check that they fulfill
9176 the requirements of the standard for procedures used as finalizers. */
9179 gfc_resolve_finalizers (gfc_symbol* derived)
9181 gfc_finalizer* list;
9182 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9183 gfc_try result = SUCCESS;
9184 bool seen_scalar = false;
9186 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9189 /* Walk over the list of finalizer-procedures, check them, and if any one
9190 does not fit in with the standard's definition, print an error and remove
9191 it from the list. */
9192 prev_link = &derived->f2k_derived->finalizers;
9193 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9199 /* Skip this finalizer if we already resolved it. */
9200 if (list->proc_tree)
9202 prev_link = &(list->next);
9206 /* Check this exists and is a SUBROUTINE. */
9207 if (!list->proc_sym->attr.subroutine)
9209 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9210 list->proc_sym->name, &list->where);
9214 /* We should have exactly one argument. */
9215 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9217 gfc_error ("FINAL procedure at %L must have exactly one argument",
9221 arg = list->proc_sym->formal->sym;
9223 /* This argument must be of our type. */
9224 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9226 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9227 &arg->declared_at, derived->name);
9231 /* It must neither be a pointer nor allocatable nor optional. */
9232 if (arg->attr.pointer)
9234 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9238 if (arg->attr.allocatable)
9240 gfc_error ("Argument of FINAL procedure at %L must not be"
9241 " ALLOCATABLE", &arg->declared_at);
9244 if (arg->attr.optional)
9246 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9251 /* It must not be INTENT(OUT). */
9252 if (arg->attr.intent == INTENT_OUT)
9254 gfc_error ("Argument of FINAL procedure at %L must not be"
9255 " INTENT(OUT)", &arg->declared_at);
9259 /* Warn if the procedure is non-scalar and not assumed shape. */
9260 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9261 && arg->as->type != AS_ASSUMED_SHAPE)
9262 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9263 " shape argument", &arg->declared_at);
9265 /* Check that it does not match in kind and rank with a FINAL procedure
9266 defined earlier. To really loop over the *earlier* declarations,
9267 we need to walk the tail of the list as new ones were pushed at the
9269 /* TODO: Handle kind parameters once they are implemented. */
9270 my_rank = (arg->as ? arg->as->rank : 0);
9271 for (i = list->next; i; i = i->next)
9273 /* Argument list might be empty; that is an error signalled earlier,
9274 but we nevertheless continued resolving. */
9275 if (i->proc_sym->formal)
9277 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9278 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9279 if (i_rank == my_rank)
9281 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9282 " rank (%d) as '%s'",
9283 list->proc_sym->name, &list->where, my_rank,
9290 /* Is this the/a scalar finalizer procedure? */
9291 if (!arg->as || arg->as->rank == 0)
9294 /* Find the symtree for this procedure. */
9295 gcc_assert (!list->proc_tree);
9296 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9298 prev_link = &list->next;
9301 /* Remove wrong nodes immediately from the list so we don't risk any
9302 troubles in the future when they might fail later expectations. */
9306 *prev_link = list->next;
9307 gfc_free_finalizer (i);
9310 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9311 were nodes in the list, must have been for arrays. It is surely a good
9312 idea to have a scalar version there if there's something to finalize. */
9313 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9314 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9315 " defined at %L, suggest also scalar one",
9316 derived->name, &derived->declared_at);
9318 /* TODO: Remove this error when finalization is finished. */
9319 gfc_error ("Finalization at %L is not yet implemented",
9320 &derived->declared_at);
9326 /* Check that it is ok for the typebound procedure proc to override the
9330 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9333 const gfc_symbol* proc_target;
9334 const gfc_symbol* old_target;
9335 unsigned proc_pass_arg, old_pass_arg, argpos;
9336 gfc_formal_arglist* proc_formal;
9337 gfc_formal_arglist* old_formal;
9339 /* This procedure should only be called for non-GENERIC proc. */
9340 gcc_assert (!proc->n.tb->is_generic);
9342 /* If the overwritten procedure is GENERIC, this is an error. */
9343 if (old->n.tb->is_generic)
9345 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9346 old->name, &proc->n.tb->where);
9350 where = proc->n.tb->where;
9351 proc_target = proc->n.tb->u.specific->n.sym;
9352 old_target = old->n.tb->u.specific->n.sym;
9354 /* Check that overridden binding is not NON_OVERRIDABLE. */
9355 if (old->n.tb->non_overridable)
9357 gfc_error ("'%s' at %L overrides a procedure binding declared"
9358 " NON_OVERRIDABLE", proc->name, &where);
9362 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9363 if (!old->n.tb->deferred && proc->n.tb->deferred)
9365 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9366 " non-DEFERRED binding", proc->name, &where);
9370 /* If the overridden binding is PURE, the overriding must be, too. */
9371 if (old_target->attr.pure && !proc_target->attr.pure)
9373 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9374 proc->name, &where);
9378 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9379 is not, the overriding must not be either. */
9380 if (old_target->attr.elemental && !proc_target->attr.elemental)
9382 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
9383 " ELEMENTAL", proc->name, &where);
9386 if (!old_target->attr.elemental && proc_target->attr.elemental)
9388 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
9389 " be ELEMENTAL, either", proc->name, &where);
9393 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
9395 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
9397 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
9398 " SUBROUTINE", proc->name, &where);
9402 /* If the overridden binding is a FUNCTION, the overriding must also be a
9403 FUNCTION and have the same characteristics. */
9404 if (old_target->attr.function)
9406 if (!proc_target->attr.function)
9408 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
9409 " FUNCTION", proc->name, &where);
9413 /* FIXME: Do more comprehensive checking (including, for instance, the
9414 rank and array-shape). */
9415 gcc_assert (proc_target->result && old_target->result);
9416 if (!gfc_compare_types (&proc_target->result->ts,
9417 &old_target->result->ts))
9419 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
9420 " matching result types", proc->name, &where);
9425 /* If the overridden binding is PUBLIC, the overriding one must not be
9427 if (old->n.tb->access == ACCESS_PUBLIC
9428 && proc->n.tb->access == ACCESS_PRIVATE)
9430 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
9431 " PRIVATE", proc->name, &where);
9435 /* Compare the formal argument lists of both procedures. This is also abused
9436 to find the position of the passed-object dummy arguments of both
9437 bindings as at least the overridden one might not yet be resolved and we
9438 need those positions in the check below. */
9439 proc_pass_arg = old_pass_arg = 0;
9440 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
9442 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
9445 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
9446 proc_formal && old_formal;
9447 proc_formal = proc_formal->next, old_formal = old_formal->next)
9449 if (proc->n.tb->pass_arg
9450 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
9451 proc_pass_arg = argpos;
9452 if (old->n.tb->pass_arg
9453 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
9454 old_pass_arg = argpos;
9456 /* Check that the names correspond. */
9457 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
9459 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
9460 " to match the corresponding argument of the overridden"
9461 " procedure", proc_formal->sym->name, proc->name, &where,
9462 old_formal->sym->name);
9466 /* Check that the types correspond if neither is the passed-object
9468 /* FIXME: Do more comprehensive testing here. */
9469 if (proc_pass_arg != argpos && old_pass_arg != argpos
9470 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
9472 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L in"
9473 " in respect to the overridden procedure",
9474 proc_formal->sym->name, proc->name, &where);
9480 if (proc_formal || old_formal)
9482 gfc_error ("'%s' at %L must have the same number of formal arguments as"
9483 " the overridden procedure", proc->name, &where);
9487 /* If the overridden binding is NOPASS, the overriding one must also be
9489 if (old->n.tb->nopass && !proc->n.tb->nopass)
9491 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
9492 " NOPASS", proc->name, &where);
9496 /* If the overridden binding is PASS(x), the overriding one must also be
9497 PASS and the passed-object dummy arguments must correspond. */
9498 if (!old->n.tb->nopass)
9500 if (proc->n.tb->nopass)
9502 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
9503 " PASS", proc->name, &where);
9507 if (proc_pass_arg != old_pass_arg)
9509 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
9510 " the same position as the passed-object dummy argument of"
9511 " the overridden procedure", proc->name, &where);
9520 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
9523 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
9524 const char* generic_name, locus where)
9529 gcc_assert (t1->specific && t2->specific);
9530 gcc_assert (!t1->specific->is_generic);
9531 gcc_assert (!t2->specific->is_generic);
9533 sym1 = t1->specific->u.specific->n.sym;
9534 sym2 = t2->specific->u.specific->n.sym;
9539 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
9540 if (sym1->attr.subroutine != sym2->attr.subroutine
9541 || sym1->attr.function != sym2->attr.function)
9543 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
9544 " GENERIC '%s' at %L",
9545 sym1->name, sym2->name, generic_name, &where);
9549 /* Compare the interfaces. */
9550 if (gfc_compare_interfaces (sym1, sym2, NULL, 1, 0, NULL, 0))
9552 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
9553 sym1->name, sym2->name, generic_name, &where);
9561 /* Worker function for resolving a generic procedure binding; this is used to
9562 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
9564 The difference between those cases is finding possible inherited bindings
9565 that are overridden, as one has to look for them in tb_sym_root,
9566 tb_uop_root or tb_op, respectively. Thus the caller must already find
9567 the super-type and set p->overridden correctly. */
9570 resolve_tb_generic_targets (gfc_symbol* super_type,
9571 gfc_typebound_proc* p, const char* name)
9573 gfc_tbp_generic* target;
9574 gfc_symtree* first_target;
9575 gfc_symtree* inherited;
9577 gcc_assert (p && p->is_generic);
9579 /* Try to find the specific bindings for the symtrees in our target-list. */
9580 gcc_assert (p->u.generic);
9581 for (target = p->u.generic; target; target = target->next)
9582 if (!target->specific)
9584 gfc_typebound_proc* overridden_tbp;
9586 const char* target_name;
9588 target_name = target->specific_st->name;
9590 /* Defined for this type directly. */
9591 if (target->specific_st->n.tb)
9593 target->specific = target->specific_st->n.tb;
9594 goto specific_found;
9597 /* Look for an inherited specific binding. */
9600 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
9605 gcc_assert (inherited->n.tb);
9606 target->specific = inherited->n.tb;
9607 goto specific_found;
9611 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
9612 " at %L", target_name, name, &p->where);
9615 /* Once we've found the specific binding, check it is not ambiguous with
9616 other specifics already found or inherited for the same GENERIC. */
9618 gcc_assert (target->specific);
9620 /* This must really be a specific binding! */
9621 if (target->specific->is_generic)
9623 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
9624 " '%s' is GENERIC, too", name, &p->where, target_name);
9628 /* Check those already resolved on this type directly. */
9629 for (g = p->u.generic; g; g = g->next)
9630 if (g != target && g->specific
9631 && check_generic_tbp_ambiguity (target, g, name, p->where)
9635 /* Check for ambiguity with inherited specific targets. */
9636 for (overridden_tbp = p->overridden; overridden_tbp;
9637 overridden_tbp = overridden_tbp->overridden)
9638 if (overridden_tbp->is_generic)
9640 for (g = overridden_tbp->u.generic; g; g = g->next)
9642 gcc_assert (g->specific);
9643 if (check_generic_tbp_ambiguity (target, g,
9644 name, p->where) == FAILURE)
9650 /* If we attempt to "overwrite" a specific binding, this is an error. */
9651 if (p->overridden && !p->overridden->is_generic)
9653 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
9654 " the same name", name, &p->where);
9658 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
9659 all must have the same attributes here. */
9660 first_target = p->u.generic->specific->u.specific;
9661 gcc_assert (first_target);
9662 p->subroutine = first_target->n.sym->attr.subroutine;
9663 p->function = first_target->n.sym->attr.function;
9669 /* Resolve a GENERIC procedure binding for a derived type. */
9672 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
9674 gfc_symbol* super_type;
9676 /* Find the overridden binding if any. */
9677 st->n.tb->overridden = NULL;
9678 super_type = gfc_get_derived_super_type (derived);
9681 gfc_symtree* overridden;
9682 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
9685 if (overridden && overridden->n.tb)
9686 st->n.tb->overridden = overridden->n.tb;
9689 /* Resolve using worker function. */
9690 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
9694 /* Retrieve the target-procedure of an operator binding and do some checks in
9695 common for intrinsic and user-defined type-bound operators. */
9698 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
9700 gfc_symbol* target_proc;
9702 gcc_assert (target->specific && !target->specific->is_generic);
9703 target_proc = target->specific->u.specific->n.sym;
9704 gcc_assert (target_proc);
9706 /* All operator bindings must have a passed-object dummy argument. */
9707 if (target->specific->nopass)
9709 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
9717 /* Resolve a type-bound intrinsic operator. */
9720 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
9721 gfc_typebound_proc* p)
9723 gfc_symbol* super_type;
9724 gfc_tbp_generic* target;
9726 /* If there's already an error here, do nothing (but don't fail again). */
9730 /* Operators should always be GENERIC bindings. */
9731 gcc_assert (p->is_generic);
9733 /* Look for an overridden binding. */
9734 super_type = gfc_get_derived_super_type (derived);
9735 if (super_type && super_type->f2k_derived)
9736 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
9739 p->overridden = NULL;
9741 /* Resolve general GENERIC properties using worker function. */
9742 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
9745 /* Check the targets to be procedures of correct interface. */
9746 for (target = p->u.generic; target; target = target->next)
9748 gfc_symbol* target_proc;
9750 target_proc = get_checked_tb_operator_target (target, p->where);
9754 if (!gfc_check_operator_interface (target_proc, op, p->where))
9766 /* Resolve a type-bound user operator (tree-walker callback). */
9768 static gfc_symbol* resolve_bindings_derived;
9769 static gfc_try resolve_bindings_result;
9771 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
9774 resolve_typebound_user_op (gfc_symtree* stree)
9776 gfc_symbol* super_type;
9777 gfc_tbp_generic* target;
9779 gcc_assert (stree && stree->n.tb);
9781 if (stree->n.tb->error)
9784 /* Operators should always be GENERIC bindings. */
9785 gcc_assert (stree->n.tb->is_generic);
9787 /* Find overridden procedure, if any. */
9788 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9789 if (super_type && super_type->f2k_derived)
9791 gfc_symtree* overridden;
9792 overridden = gfc_find_typebound_user_op (super_type, NULL,
9793 stree->name, true, NULL);
9795 if (overridden && overridden->n.tb)
9796 stree->n.tb->overridden = overridden->n.tb;
9799 stree->n.tb->overridden = NULL;
9801 /* Resolve basically using worker function. */
9802 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
9806 /* Check the targets to be functions of correct interface. */
9807 for (target = stree->n.tb->u.generic; target; target = target->next)
9809 gfc_symbol* target_proc;
9811 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
9815 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
9822 resolve_bindings_result = FAILURE;
9823 stree->n.tb->error = 1;
9827 /* Resolve the type-bound procedures for a derived type. */
9830 resolve_typebound_procedure (gfc_symtree* stree)
9835 gfc_symbol* super_type;
9836 gfc_component* comp;
9840 /* Undefined specific symbol from GENERIC target definition. */
9844 if (stree->n.tb->error)
9847 /* If this is a GENERIC binding, use that routine. */
9848 if (stree->n.tb->is_generic)
9850 if (resolve_typebound_generic (resolve_bindings_derived, stree)
9856 /* Get the target-procedure to check it. */
9857 gcc_assert (!stree->n.tb->is_generic);
9858 gcc_assert (stree->n.tb->u.specific);
9859 proc = stree->n.tb->u.specific->n.sym;
9860 where = stree->n.tb->where;
9862 /* Default access should already be resolved from the parser. */
9863 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
9865 /* It should be a module procedure or an external procedure with explicit
9866 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
9867 if ((!proc->attr.subroutine && !proc->attr.function)
9868 || (proc->attr.proc != PROC_MODULE
9869 && proc->attr.if_source != IFSRC_IFBODY)
9870 || (proc->attr.abstract && !stree->n.tb->deferred))
9872 gfc_error ("'%s' must be a module procedure or an external procedure with"
9873 " an explicit interface at %L", proc->name, &where);
9876 stree->n.tb->subroutine = proc->attr.subroutine;
9877 stree->n.tb->function = proc->attr.function;
9879 /* Find the super-type of the current derived type. We could do this once and
9880 store in a global if speed is needed, but as long as not I believe this is
9881 more readable and clearer. */
9882 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9884 /* If PASS, resolve and check arguments if not already resolved / loaded
9885 from a .mod file. */
9886 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
9888 if (stree->n.tb->pass_arg)
9890 gfc_formal_arglist* i;
9892 /* If an explicit passing argument name is given, walk the arg-list
9896 stree->n.tb->pass_arg_num = 1;
9897 for (i = proc->formal; i; i = i->next)
9899 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
9904 ++stree->n.tb->pass_arg_num;
9909 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
9911 proc->name, stree->n.tb->pass_arg, &where,
9912 stree->n.tb->pass_arg);
9918 /* Otherwise, take the first one; there should in fact be at least
9920 stree->n.tb->pass_arg_num = 1;
9923 gfc_error ("Procedure '%s' with PASS at %L must have at"
9924 " least one argument", proc->name, &where);
9927 me_arg = proc->formal->sym;
9930 /* Now check that the argument-type matches. */
9931 gcc_assert (me_arg);
9932 if (me_arg->ts.type != BT_CLASS)
9934 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
9935 " at %L", proc->name, &where);
9939 if (me_arg->ts.u.derived->components->ts.u.derived
9940 != resolve_bindings_derived)
9942 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
9943 " the derived-type '%s'", me_arg->name, proc->name,
9944 me_arg->name, &where, resolve_bindings_derived->name);
9950 /* If we are extending some type, check that we don't override a procedure
9951 flagged NON_OVERRIDABLE. */
9952 stree->n.tb->overridden = NULL;
9955 gfc_symtree* overridden;
9956 overridden = gfc_find_typebound_proc (super_type, NULL,
9957 stree->name, true, NULL);
9959 if (overridden && overridden->n.tb)
9960 stree->n.tb->overridden = overridden->n.tb;
9962 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
9966 /* See if there's a name collision with a component directly in this type. */
9967 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
9968 if (!strcmp (comp->name, stree->name))
9970 gfc_error ("Procedure '%s' at %L has the same name as a component of"
9972 stree->name, &where, resolve_bindings_derived->name);
9976 /* Try to find a name collision with an inherited component. */
9977 if (super_type && gfc_find_component (super_type, stree->name, true, true))
9979 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
9980 " component of '%s'",
9981 stree->name, &where, resolve_bindings_derived->name);
9985 stree->n.tb->error = 0;
9989 resolve_bindings_result = FAILURE;
9990 stree->n.tb->error = 1;
9994 resolve_typebound_procedures (gfc_symbol* derived)
9998 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10001 resolve_bindings_derived = derived;
10002 resolve_bindings_result = SUCCESS;
10004 if (derived->f2k_derived->tb_sym_root)
10005 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10006 &resolve_typebound_procedure);
10008 if (derived->f2k_derived->tb_uop_root)
10009 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10010 &resolve_typebound_user_op);
10012 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10014 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10015 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10017 resolve_bindings_result = FAILURE;
10020 return resolve_bindings_result;
10024 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10025 to give all identical derived types the same backend_decl. */
10027 add_dt_to_dt_list (gfc_symbol *derived)
10029 gfc_dt_list *dt_list;
10031 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10032 if (derived == dt_list->derived)
10035 if (dt_list == NULL)
10037 dt_list = gfc_get_dt_list ();
10038 dt_list->next = gfc_derived_types;
10039 dt_list->derived = derived;
10040 gfc_derived_types = dt_list;
10045 /* Ensure that a derived-type is really not abstract, meaning that every
10046 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10049 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10054 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10056 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10059 if (st->n.tb && st->n.tb->deferred)
10061 gfc_symtree* overriding;
10062 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10063 gcc_assert (overriding && overriding->n.tb);
10064 if (overriding->n.tb->deferred)
10066 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10067 " '%s' is DEFERRED and not overridden",
10068 sub->name, &sub->declared_at, st->name);
10077 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10079 /* The algorithm used here is to recursively travel up the ancestry of sub
10080 and for each ancestor-type, check all bindings. If any of them is
10081 DEFERRED, look it up starting from sub and see if the found (overriding)
10082 binding is not DEFERRED.
10083 This is not the most efficient way to do this, but it should be ok and is
10084 clearer than something sophisticated. */
10086 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
10088 /* Walk bindings of this ancestor. */
10089 if (ancestor->f2k_derived)
10092 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10097 /* Find next ancestor type and recurse on it. */
10098 ancestor = gfc_get_derived_super_type (ancestor);
10100 return ensure_not_abstract (sub, ancestor);
10106 static void resolve_symbol (gfc_symbol *sym);
10109 /* Resolve the components of a derived type. */
10112 resolve_fl_derived (gfc_symbol *sym)
10114 gfc_symbol* super_type;
10118 super_type = gfc_get_derived_super_type (sym);
10120 /* Ensure the extended type gets resolved before we do. */
10121 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10124 /* An ABSTRACT type must be extensible. */
10125 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10127 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10128 sym->name, &sym->declared_at);
10132 for (c = sym->components; c != NULL; c = c->next)
10134 if (c->attr.proc_pointer && c->ts.interface)
10136 if (c->ts.interface->attr.procedure)
10137 gfc_error ("Interface '%s', used by procedure pointer component "
10138 "'%s' at %L, is declared in a later PROCEDURE statement",
10139 c->ts.interface->name, c->name, &c->loc);
10141 /* Get the attributes from the interface (now resolved). */
10142 if (c->ts.interface->attr.if_source
10143 || c->ts.interface->attr.intrinsic)
10145 gfc_symbol *ifc = c->ts.interface;
10147 if (ifc->formal && !ifc->formal_ns)
10148 resolve_symbol (ifc);
10150 if (ifc->attr.intrinsic)
10151 resolve_intrinsic (ifc, &ifc->declared_at);
10155 c->ts = ifc->result->ts;
10156 c->attr.allocatable = ifc->result->attr.allocatable;
10157 c->attr.pointer = ifc->result->attr.pointer;
10158 c->attr.dimension = ifc->result->attr.dimension;
10159 c->as = gfc_copy_array_spec (ifc->result->as);
10164 c->attr.allocatable = ifc->attr.allocatable;
10165 c->attr.pointer = ifc->attr.pointer;
10166 c->attr.dimension = ifc->attr.dimension;
10167 c->as = gfc_copy_array_spec (ifc->as);
10169 c->ts.interface = ifc;
10170 c->attr.function = ifc->attr.function;
10171 c->attr.subroutine = ifc->attr.subroutine;
10172 gfc_copy_formal_args_ppc (c, ifc);
10174 c->attr.pure = ifc->attr.pure;
10175 c->attr.elemental = ifc->attr.elemental;
10176 c->attr.recursive = ifc->attr.recursive;
10177 c->attr.always_explicit = ifc->attr.always_explicit;
10178 c->attr.ext_attr |= ifc->attr.ext_attr;
10179 /* Replace symbols in array spec. */
10183 for (i = 0; i < c->as->rank; i++)
10185 gfc_expr_replace_comp (c->as->lower[i], c);
10186 gfc_expr_replace_comp (c->as->upper[i], c);
10189 /* Copy char length. */
10190 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10192 c->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10193 gfc_expr_replace_comp (c->ts.u.cl->length, c);
10196 else if (c->ts.interface->name[0] != '\0')
10198 gfc_error ("Interface '%s' of procedure pointer component "
10199 "'%s' at %L must be explicit", c->ts.interface->name,
10204 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10206 c->ts = *gfc_get_default_type (c->name, NULL);
10207 c->attr.implicit_type = 1;
10210 /* Procedure pointer components: Check PASS arg. */
10211 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0)
10213 gfc_symbol* me_arg;
10215 if (c->tb->pass_arg)
10217 gfc_formal_arglist* i;
10219 /* If an explicit passing argument name is given, walk the arg-list
10220 and look for it. */
10223 c->tb->pass_arg_num = 1;
10224 for (i = c->formal; i; i = i->next)
10226 if (!strcmp (i->sym->name, c->tb->pass_arg))
10231 c->tb->pass_arg_num++;
10236 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10237 "at %L has no argument '%s'", c->name,
10238 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10245 /* Otherwise, take the first one; there should in fact be at least
10247 c->tb->pass_arg_num = 1;
10250 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10251 "must have at least one argument",
10256 me_arg = c->formal->sym;
10259 /* Now check that the argument-type matches. */
10260 gcc_assert (me_arg);
10261 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10262 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10263 || (me_arg->ts.type == BT_CLASS
10264 && me_arg->ts.u.derived->components->ts.u.derived != sym))
10266 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10267 " the derived type '%s'", me_arg->name, c->name,
10268 me_arg->name, &c->loc, sym->name);
10273 /* Check for C453. */
10274 if (me_arg->attr.dimension)
10276 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10277 "must be scalar", me_arg->name, c->name, me_arg->name,
10283 if (me_arg->attr.pointer)
10285 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10286 "may not have the POINTER attribute", me_arg->name,
10287 c->name, me_arg->name, &c->loc);
10292 if (me_arg->attr.allocatable)
10294 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10295 "may not be ALLOCATABLE", me_arg->name, c->name,
10296 me_arg->name, &c->loc);
10301 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
10302 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10303 " at %L", c->name, &c->loc);
10307 /* Check type-spec if this is not the parent-type component. */
10308 if ((!sym->attr.extension || c != sym->components)
10309 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
10312 /* If this type is an extension, see if this component has the same name
10313 as an inherited type-bound procedure. */
10315 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
10317 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
10318 " inherited type-bound procedure",
10319 c->name, sym->name, &c->loc);
10323 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
10325 if (c->ts.u.cl->length == NULL
10326 || (resolve_charlen (c->ts.u.cl) == FAILURE)
10327 || !gfc_is_constant_expr (c->ts.u.cl->length))
10329 gfc_error ("Character length of component '%s' needs to "
10330 "be a constant specification expression at %L",
10332 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
10337 if (c->ts.type == BT_DERIVED
10338 && sym->component_access != ACCESS_PRIVATE
10339 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10340 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
10341 && !c->ts.u.derived->attr.use_assoc
10342 && !gfc_check_access (c->ts.u.derived->attr.access,
10343 c->ts.u.derived->ns->default_access)
10344 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
10345 "is a PRIVATE type and cannot be a component of "
10346 "'%s', which is PUBLIC at %L", c->name,
10347 sym->name, &sym->declared_at) == FAILURE)
10350 if (sym->attr.sequence)
10352 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
10354 gfc_error ("Component %s of SEQUENCE type declared at %L does "
10355 "not have the SEQUENCE attribute",
10356 c->ts.u.derived->name, &sym->declared_at);
10361 if (c->ts.type == BT_DERIVED && c->attr.pointer
10362 && c->ts.u.derived->components == NULL
10363 && !c->ts.u.derived->attr.zero_comp)
10365 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10366 "that has not been declared", c->name, sym->name,
10372 if (c->ts.type == BT_CLASS
10373 && !(c->ts.u.derived->components->attr.pointer
10374 || c->ts.u.derived->components->attr.allocatable))
10376 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
10377 "or pointer", c->name, &c->loc);
10381 /* Ensure that all the derived type components are put on the
10382 derived type list; even in formal namespaces, where derived type
10383 pointer components might not have been declared. */
10384 if (c->ts.type == BT_DERIVED
10386 && c->ts.u.derived->components
10388 && sym != c->ts.u.derived)
10389 add_dt_to_dt_list (c->ts.u.derived);
10391 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
10395 for (i = 0; i < c->as->rank; i++)
10397 if (c->as->lower[i] == NULL
10398 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
10399 || !gfc_is_constant_expr (c->as->lower[i])
10400 || c->as->upper[i] == NULL
10401 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
10402 || !gfc_is_constant_expr (c->as->upper[i]))
10404 gfc_error ("Component '%s' of '%s' at %L must have "
10405 "constant array bounds",
10406 c->name, sym->name, &c->loc);
10412 /* Resolve the type-bound procedures. */
10413 if (resolve_typebound_procedures (sym) == FAILURE)
10416 /* Resolve the finalizer procedures. */
10417 if (gfc_resolve_finalizers (sym) == FAILURE)
10420 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
10421 all DEFERRED bindings are overridden. */
10422 if (super_type && super_type->attr.abstract && !sym->attr.abstract
10423 && ensure_not_abstract (sym, super_type) == FAILURE)
10426 /* Add derived type to the derived type list. */
10427 add_dt_to_dt_list (sym);
10434 resolve_fl_namelist (gfc_symbol *sym)
10439 /* Reject PRIVATE objects in a PUBLIC namelist. */
10440 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
10442 for (nl = sym->namelist; nl; nl = nl->next)
10444 if (!nl->sym->attr.use_assoc
10445 && !is_sym_host_assoc (nl->sym, sym->ns)
10446 && !gfc_check_access(nl->sym->attr.access,
10447 nl->sym->ns->default_access))
10449 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
10450 "cannot be member of PUBLIC namelist '%s' at %L",
10451 nl->sym->name, sym->name, &sym->declared_at);
10455 /* Types with private components that came here by USE-association. */
10456 if (nl->sym->ts.type == BT_DERIVED
10457 && derived_inaccessible (nl->sym->ts.u.derived))
10459 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
10460 "components and cannot be member of namelist '%s' at %L",
10461 nl->sym->name, sym->name, &sym->declared_at);
10465 /* Types with private components that are defined in the same module. */
10466 if (nl->sym->ts.type == BT_DERIVED
10467 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
10468 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
10469 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
10470 nl->sym->ns->default_access))
10472 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
10473 "cannot be a member of PUBLIC namelist '%s' at %L",
10474 nl->sym->name, sym->name, &sym->declared_at);
10480 for (nl = sym->namelist; nl; nl = nl->next)
10482 /* Reject namelist arrays of assumed shape. */
10483 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
10484 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
10485 "must not have assumed shape in namelist "
10486 "'%s' at %L", nl->sym->name, sym->name,
10487 &sym->declared_at) == FAILURE)
10490 /* Reject namelist arrays that are not constant shape. */
10491 if (is_non_constant_shape_array (nl->sym))
10493 gfc_error ("NAMELIST array object '%s' must have constant "
10494 "shape in namelist '%s' at %L", nl->sym->name,
10495 sym->name, &sym->declared_at);
10499 /* Namelist objects cannot have allocatable or pointer components. */
10500 if (nl->sym->ts.type != BT_DERIVED)
10503 if (nl->sym->ts.u.derived->attr.alloc_comp)
10505 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10506 "have ALLOCATABLE components",
10507 nl->sym->name, sym->name, &sym->declared_at);
10511 if (nl->sym->ts.u.derived->attr.pointer_comp)
10513 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10514 "have POINTER components",
10515 nl->sym->name, sym->name, &sym->declared_at);
10521 /* 14.1.2 A module or internal procedure represent local entities
10522 of the same type as a namelist member and so are not allowed. */
10523 for (nl = sym->namelist; nl; nl = nl->next)
10525 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
10528 if (nl->sym->attr.function && nl->sym == nl->sym->result)
10529 if ((nl->sym == sym->ns->proc_name)
10531 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
10535 if (nl->sym && nl->sym->name)
10536 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
10537 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
10539 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
10540 "attribute in '%s' at %L", nlsym->name,
10541 &sym->declared_at);
10551 resolve_fl_parameter (gfc_symbol *sym)
10553 /* A parameter array's shape needs to be constant. */
10554 if (sym->as != NULL
10555 && (sym->as->type == AS_DEFERRED
10556 || is_non_constant_shape_array (sym)))
10558 gfc_error ("Parameter array '%s' at %L cannot be automatic "
10559 "or of deferred shape", sym->name, &sym->declared_at);
10563 /* Make sure a parameter that has been implicitly typed still
10564 matches the implicit type, since PARAMETER statements can precede
10565 IMPLICIT statements. */
10566 if (sym->attr.implicit_type
10567 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
10570 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
10571 "later IMPLICIT type", sym->name, &sym->declared_at);
10575 /* Make sure the types of derived parameters are consistent. This
10576 type checking is deferred until resolution because the type may
10577 refer to a derived type from the host. */
10578 if (sym->ts.type == BT_DERIVED
10579 && !gfc_compare_types (&sym->ts, &sym->value->ts))
10581 gfc_error ("Incompatible derived type in PARAMETER at %L",
10582 &sym->value->where);
10589 /* Do anything necessary to resolve a symbol. Right now, we just
10590 assume that an otherwise unknown symbol is a variable. This sort
10591 of thing commonly happens for symbols in module. */
10594 resolve_symbol (gfc_symbol *sym)
10596 int check_constant, mp_flag;
10597 gfc_symtree *symtree;
10598 gfc_symtree *this_symtree;
10602 if (sym->attr.flavor == FL_UNKNOWN)
10605 /* If we find that a flavorless symbol is an interface in one of the
10606 parent namespaces, find its symtree in this namespace, free the
10607 symbol and set the symtree to point to the interface symbol. */
10608 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
10610 symtree = gfc_find_symtree (ns->sym_root, sym->name);
10611 if (symtree && symtree->n.sym->generic)
10613 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
10617 gfc_free_symbol (sym);
10618 symtree->n.sym->refs++;
10619 this_symtree->n.sym = symtree->n.sym;
10624 /* Otherwise give it a flavor according to such attributes as
10626 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
10627 sym->attr.flavor = FL_VARIABLE;
10630 sym->attr.flavor = FL_PROCEDURE;
10631 if (sym->attr.dimension)
10632 sym->attr.function = 1;
10636 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
10637 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
10639 if (sym->attr.procedure && sym->ts.interface
10640 && sym->attr.if_source != IFSRC_DECL)
10642 if (sym->ts.interface == sym)
10644 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
10645 "interface", sym->name, &sym->declared_at);
10648 if (sym->ts.interface->attr.procedure)
10650 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
10651 " in a later PROCEDURE statement", sym->ts.interface->name,
10652 sym->name,&sym->declared_at);
10656 /* Get the attributes from the interface (now resolved). */
10657 if (sym->ts.interface->attr.if_source
10658 || sym->ts.interface->attr.intrinsic)
10660 gfc_symbol *ifc = sym->ts.interface;
10661 resolve_symbol (ifc);
10663 if (ifc->attr.intrinsic)
10664 resolve_intrinsic (ifc, &ifc->declared_at);
10667 sym->ts = ifc->result->ts;
10670 sym->ts.interface = ifc;
10671 sym->attr.function = ifc->attr.function;
10672 sym->attr.subroutine = ifc->attr.subroutine;
10673 gfc_copy_formal_args (sym, ifc);
10675 sym->attr.allocatable = ifc->attr.allocatable;
10676 sym->attr.pointer = ifc->attr.pointer;
10677 sym->attr.pure = ifc->attr.pure;
10678 sym->attr.elemental = ifc->attr.elemental;
10679 sym->attr.dimension = ifc->attr.dimension;
10680 sym->attr.recursive = ifc->attr.recursive;
10681 sym->attr.always_explicit = ifc->attr.always_explicit;
10682 sym->attr.ext_attr |= ifc->attr.ext_attr;
10683 /* Copy array spec. */
10684 sym->as = gfc_copy_array_spec (ifc->as);
10688 for (i = 0; i < sym->as->rank; i++)
10690 gfc_expr_replace_symbols (sym->as->lower[i], sym);
10691 gfc_expr_replace_symbols (sym->as->upper[i], sym);
10694 /* Copy char length. */
10695 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10697 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10698 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
10701 else if (sym->ts.interface->name[0] != '\0')
10703 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
10704 sym->ts.interface->name, sym->name, &sym->declared_at);
10709 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
10712 /* Symbols that are module procedures with results (functions) have
10713 the types and array specification copied for type checking in
10714 procedures that call them, as well as for saving to a module
10715 file. These symbols can't stand the scrutiny that their results
10717 mp_flag = (sym->result != NULL && sym->result != sym);
10720 /* Make sure that the intrinsic is consistent with its internal
10721 representation. This needs to be done before assigning a default
10722 type to avoid spurious warnings. */
10723 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
10724 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
10727 /* Assign default type to symbols that need one and don't have one. */
10728 if (sym->ts.type == BT_UNKNOWN)
10730 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
10731 gfc_set_default_type (sym, 1, NULL);
10733 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
10734 && !sym->attr.function && !sym->attr.subroutine
10735 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
10736 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
10738 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
10740 /* The specific case of an external procedure should emit an error
10741 in the case that there is no implicit type. */
10743 gfc_set_default_type (sym, sym->attr.external, NULL);
10746 /* Result may be in another namespace. */
10747 resolve_symbol (sym->result);
10749 if (!sym->result->attr.proc_pointer)
10751 sym->ts = sym->result->ts;
10752 sym->as = gfc_copy_array_spec (sym->result->as);
10753 sym->attr.dimension = sym->result->attr.dimension;
10754 sym->attr.pointer = sym->result->attr.pointer;
10755 sym->attr.allocatable = sym->result->attr.allocatable;
10761 /* Assumed size arrays and assumed shape arrays must be dummy
10764 if (sym->as != NULL
10765 && (sym->as->type == AS_ASSUMED_SIZE
10766 || sym->as->type == AS_ASSUMED_SHAPE)
10767 && sym->attr.dummy == 0)
10769 if (sym->as->type == AS_ASSUMED_SIZE)
10770 gfc_error ("Assumed size array at %L must be a dummy argument",
10771 &sym->declared_at);
10773 gfc_error ("Assumed shape array at %L must be a dummy argument",
10774 &sym->declared_at);
10778 /* Make sure symbols with known intent or optional are really dummy
10779 variable. Because of ENTRY statement, this has to be deferred
10780 until resolution time. */
10782 if (!sym->attr.dummy
10783 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
10785 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
10789 if (sym->attr.value && !sym->attr.dummy)
10791 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
10792 "it is not a dummy argument", sym->name, &sym->declared_at);
10796 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
10798 gfc_charlen *cl = sym->ts.u.cl;
10799 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10801 gfc_error ("Character dummy variable '%s' at %L with VALUE "
10802 "attribute must have constant length",
10803 sym->name, &sym->declared_at);
10807 if (sym->ts.is_c_interop
10808 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
10810 gfc_error ("C interoperable character dummy variable '%s' at %L "
10811 "with VALUE attribute must have length one",
10812 sym->name, &sym->declared_at);
10817 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
10818 do this for something that was implicitly typed because that is handled
10819 in gfc_set_default_type. Handle dummy arguments and procedure
10820 definitions separately. Also, anything that is use associated is not
10821 handled here but instead is handled in the module it is declared in.
10822 Finally, derived type definitions are allowed to be BIND(C) since that
10823 only implies that they're interoperable, and they are checked fully for
10824 interoperability when a variable is declared of that type. */
10825 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
10826 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
10827 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
10829 gfc_try t = SUCCESS;
10831 /* First, make sure the variable is declared at the
10832 module-level scope (J3/04-007, Section 15.3). */
10833 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
10834 sym->attr.in_common == 0)
10836 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
10837 "is neither a COMMON block nor declared at the "
10838 "module level scope", sym->name, &(sym->declared_at));
10841 else if (sym->common_head != NULL)
10843 t = verify_com_block_vars_c_interop (sym->common_head);
10847 /* If type() declaration, we need to verify that the components
10848 of the given type are all C interoperable, etc. */
10849 if (sym->ts.type == BT_DERIVED &&
10850 sym->ts.u.derived->attr.is_c_interop != 1)
10852 /* Make sure the user marked the derived type as BIND(C). If
10853 not, call the verify routine. This could print an error
10854 for the derived type more than once if multiple variables
10855 of that type are declared. */
10856 if (sym->ts.u.derived->attr.is_bind_c != 1)
10857 verify_bind_c_derived_type (sym->ts.u.derived);
10861 /* Verify the variable itself as C interoperable if it
10862 is BIND(C). It is not possible for this to succeed if
10863 the verify_bind_c_derived_type failed, so don't have to handle
10864 any error returned by verify_bind_c_derived_type. */
10865 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
10866 sym->common_block);
10871 /* clear the is_bind_c flag to prevent reporting errors more than
10872 once if something failed. */
10873 sym->attr.is_bind_c = 0;
10878 /* If a derived type symbol has reached this point, without its
10879 type being declared, we have an error. Notice that most
10880 conditions that produce undefined derived types have already
10881 been dealt with. However, the likes of:
10882 implicit type(t) (t) ..... call foo (t) will get us here if
10883 the type is not declared in the scope of the implicit
10884 statement. Change the type to BT_UNKNOWN, both because it is so
10885 and to prevent an ICE. */
10886 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
10887 && !sym->ts.u.derived->attr.zero_comp)
10889 gfc_error ("The derived type '%s' at %L is of type '%s', "
10890 "which has not been defined", sym->name,
10891 &sym->declared_at, sym->ts.u.derived->name);
10892 sym->ts.type = BT_UNKNOWN;
10896 /* Make sure that the derived type has been resolved and that the
10897 derived type is visible in the symbol's namespace, if it is a
10898 module function and is not PRIVATE. */
10899 if (sym->ts.type == BT_DERIVED
10900 && sym->ts.u.derived->attr.use_assoc
10901 && sym->ns->proc_name
10902 && sym->ns->proc_name->attr.flavor == FL_MODULE)
10906 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
10909 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
10910 if (!ds && sym->attr.function
10911 && gfc_check_access (sym->attr.access, sym->ns->default_access))
10913 symtree = gfc_new_symtree (&sym->ns->sym_root,
10914 sym->ts.u.derived->name);
10915 symtree->n.sym = sym->ts.u.derived;
10916 sym->ts.u.derived->refs++;
10920 /* Unless the derived-type declaration is use associated, Fortran 95
10921 does not allow public entries of private derived types.
10922 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
10923 161 in 95-006r3. */
10924 if (sym->ts.type == BT_DERIVED
10925 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
10926 && !sym->ts.u.derived->attr.use_assoc
10927 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10928 && !gfc_check_access (sym->ts.u.derived->attr.access,
10929 sym->ts.u.derived->ns->default_access)
10930 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
10931 "of PRIVATE derived type '%s'",
10932 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
10933 : "variable", sym->name, &sym->declared_at,
10934 sym->ts.u.derived->name) == FAILURE)
10937 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
10938 default initialization is defined (5.1.2.4.4). */
10939 if (sym->ts.type == BT_DERIVED
10941 && sym->attr.intent == INTENT_OUT
10943 && sym->as->type == AS_ASSUMED_SIZE)
10945 for (c = sym->ts.u.derived->components; c; c = c->next)
10947 if (c->initializer)
10949 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
10950 "ASSUMED SIZE and so cannot have a default initializer",
10951 sym->name, &sym->declared_at);
10957 switch (sym->attr.flavor)
10960 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
10965 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
10970 if (resolve_fl_namelist (sym) == FAILURE)
10975 if (resolve_fl_parameter (sym) == FAILURE)
10983 /* Resolve array specifier. Check as well some constraints
10984 on COMMON blocks. */
10986 check_constant = sym->attr.in_common && !sym->attr.pointer;
10988 /* Set the formal_arg_flag so that check_conflict will not throw
10989 an error for host associated variables in the specification
10990 expression for an array_valued function. */
10991 if (sym->attr.function && sym->as)
10992 formal_arg_flag = 1;
10994 gfc_resolve_array_spec (sym->as, check_constant);
10996 formal_arg_flag = 0;
10998 /* Resolve formal namespaces. */
10999 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11000 && !sym->attr.contained && !sym->attr.intrinsic)
11001 gfc_resolve (sym->formal_ns);
11003 /* Make sure the formal namespace is present. */
11004 if (sym->formal && !sym->formal_ns)
11006 gfc_formal_arglist *formal = sym->formal;
11007 while (formal && !formal->sym)
11008 formal = formal->next;
11012 sym->formal_ns = formal->sym->ns;
11013 sym->formal_ns->refs++;
11017 /* Check threadprivate restrictions. */
11018 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11019 && (!sym->attr.in_common
11020 && sym->module == NULL
11021 && (sym->ns->proc_name == NULL
11022 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11023 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11025 /* If we have come this far we can apply default-initializers, as
11026 described in 14.7.5, to those variables that have not already
11027 been assigned one. */
11028 if (sym->ts.type == BT_DERIVED
11029 && sym->attr.referenced
11030 && sym->ns == gfc_current_ns
11032 && !sym->attr.allocatable
11033 && !sym->attr.alloc_comp)
11035 symbol_attribute *a = &sym->attr;
11037 if ((!a->save && !a->dummy && !a->pointer
11038 && !a->in_common && !a->use_assoc
11039 && !(a->function && sym != sym->result))
11040 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11041 apply_default_init (sym);
11044 /* If this symbol has a type-spec, check it. */
11045 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11046 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11047 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11053 /************* Resolve DATA statements *************/
11057 gfc_data_value *vnode;
11063 /* Advance the values structure to point to the next value in the data list. */
11066 next_data_value (void)
11068 while (mpz_cmp_ui (values.left, 0) == 0)
11070 if (!gfc_is_constant_expr (values.vnode->expr))
11071 gfc_error ("non-constant DATA value at %L",
11072 &values.vnode->expr->where);
11074 if (values.vnode->next == NULL)
11077 values.vnode = values.vnode->next;
11078 mpz_set (values.left, values.vnode->repeat);
11086 check_data_variable (gfc_data_variable *var, locus *where)
11092 ar_type mark = AR_UNKNOWN;
11094 mpz_t section_index[GFC_MAX_DIMENSIONS];
11100 if (gfc_resolve_expr (var->expr) == FAILURE)
11104 mpz_init_set_si (offset, 0);
11107 if (e->expr_type != EXPR_VARIABLE)
11108 gfc_internal_error ("check_data_variable(): Bad expression");
11110 sym = e->symtree->n.sym;
11112 if (sym->ns->is_block_data && !sym->attr.in_common)
11114 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11115 sym->name, &sym->declared_at);
11118 if (e->ref == NULL && sym->as)
11120 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11121 " declaration", sym->name, where);
11125 has_pointer = sym->attr.pointer;
11127 for (ref = e->ref; ref; ref = ref->next)
11129 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11133 && ref->type == REF_ARRAY
11134 && ref->u.ar.type != AR_FULL)
11136 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11137 "be a full array", sym->name, where);
11142 if (e->rank == 0 || has_pointer)
11144 mpz_init_set_ui (size, 1);
11151 /* Find the array section reference. */
11152 for (ref = e->ref; ref; ref = ref->next)
11154 if (ref->type != REF_ARRAY)
11156 if (ref->u.ar.type == AR_ELEMENT)
11162 /* Set marks according to the reference pattern. */
11163 switch (ref->u.ar.type)
11171 /* Get the start position of array section. */
11172 gfc_get_section_index (ar, section_index, &offset);
11177 gcc_unreachable ();
11180 if (gfc_array_size (e, &size) == FAILURE)
11182 gfc_error ("Nonconstant array section at %L in DATA statement",
11184 mpz_clear (offset);
11191 while (mpz_cmp_ui (size, 0) > 0)
11193 if (next_data_value () == FAILURE)
11195 gfc_error ("DATA statement at %L has more variables than values",
11201 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
11205 /* If we have more than one element left in the repeat count,
11206 and we have more than one element left in the target variable,
11207 then create a range assignment. */
11208 /* FIXME: Only done for full arrays for now, since array sections
11210 if (mark == AR_FULL && ref && ref->next == NULL
11211 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
11215 if (mpz_cmp (size, values.left) >= 0)
11217 mpz_init_set (range, values.left);
11218 mpz_sub (size, size, values.left);
11219 mpz_set_ui (values.left, 0);
11223 mpz_init_set (range, size);
11224 mpz_sub (values.left, values.left, size);
11225 mpz_set_ui (size, 0);
11228 gfc_assign_data_value_range (var->expr, values.vnode->expr,
11231 mpz_add (offset, offset, range);
11235 /* Assign initial value to symbol. */
11238 mpz_sub_ui (values.left, values.left, 1);
11239 mpz_sub_ui (size, size, 1);
11241 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
11245 if (mark == AR_FULL)
11246 mpz_add_ui (offset, offset, 1);
11248 /* Modify the array section indexes and recalculate the offset
11249 for next element. */
11250 else if (mark == AR_SECTION)
11251 gfc_advance_section (section_index, ar, &offset);
11255 if (mark == AR_SECTION)
11257 for (i = 0; i < ar->dimen; i++)
11258 mpz_clear (section_index[i]);
11262 mpz_clear (offset);
11268 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
11270 /* Iterate over a list of elements in a DATA statement. */
11273 traverse_data_list (gfc_data_variable *var, locus *where)
11276 iterator_stack frame;
11277 gfc_expr *e, *start, *end, *step;
11278 gfc_try retval = SUCCESS;
11280 mpz_init (frame.value);
11282 start = gfc_copy_expr (var->iter.start);
11283 end = gfc_copy_expr (var->iter.end);
11284 step = gfc_copy_expr (var->iter.step);
11286 if (gfc_simplify_expr (start, 1) == FAILURE
11287 || start->expr_type != EXPR_CONSTANT)
11289 gfc_error ("iterator start at %L does not simplify", &start->where);
11293 if (gfc_simplify_expr (end, 1) == FAILURE
11294 || end->expr_type != EXPR_CONSTANT)
11296 gfc_error ("iterator end at %L does not simplify", &end->where);
11300 if (gfc_simplify_expr (step, 1) == FAILURE
11301 || step->expr_type != EXPR_CONSTANT)
11303 gfc_error ("iterator step at %L does not simplify", &step->where);
11308 mpz_init_set (trip, end->value.integer);
11309 mpz_sub (trip, trip, start->value.integer);
11310 mpz_add (trip, trip, step->value.integer);
11312 mpz_div (trip, trip, step->value.integer);
11314 mpz_set (frame.value, start->value.integer);
11316 frame.prev = iter_stack;
11317 frame.variable = var->iter.var->symtree;
11318 iter_stack = &frame;
11320 while (mpz_cmp_ui (trip, 0) > 0)
11322 if (traverse_data_var (var->list, where) == FAILURE)
11329 e = gfc_copy_expr (var->expr);
11330 if (gfc_simplify_expr (e, 1) == FAILURE)
11338 mpz_add (frame.value, frame.value, step->value.integer);
11340 mpz_sub_ui (trip, trip, 1);
11345 mpz_clear (frame.value);
11347 gfc_free_expr (start);
11348 gfc_free_expr (end);
11349 gfc_free_expr (step);
11351 iter_stack = frame.prev;
11356 /* Type resolve variables in the variable list of a DATA statement. */
11359 traverse_data_var (gfc_data_variable *var, locus *where)
11363 for (; var; var = var->next)
11365 if (var->expr == NULL)
11366 t = traverse_data_list (var, where);
11368 t = check_data_variable (var, where);
11378 /* Resolve the expressions and iterators associated with a data statement.
11379 This is separate from the assignment checking because data lists should
11380 only be resolved once. */
11383 resolve_data_variables (gfc_data_variable *d)
11385 for (; d; d = d->next)
11387 if (d->list == NULL)
11389 if (gfc_resolve_expr (d->expr) == FAILURE)
11394 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
11397 if (resolve_data_variables (d->list) == FAILURE)
11406 /* Resolve a single DATA statement. We implement this by storing a pointer to
11407 the value list into static variables, and then recursively traversing the
11408 variables list, expanding iterators and such. */
11411 resolve_data (gfc_data *d)
11414 if (resolve_data_variables (d->var) == FAILURE)
11417 values.vnode = d->value;
11418 if (d->value == NULL)
11419 mpz_set_ui (values.left, 0);
11421 mpz_set (values.left, d->value->repeat);
11423 if (traverse_data_var (d->var, &d->where) == FAILURE)
11426 /* At this point, we better not have any values left. */
11428 if (next_data_value () == SUCCESS)
11429 gfc_error ("DATA statement at %L has more values than variables",
11434 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
11435 accessed by host or use association, is a dummy argument to a pure function,
11436 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
11437 is storage associated with any such variable, shall not be used in the
11438 following contexts: (clients of this function). */
11440 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
11441 procedure. Returns zero if assignment is OK, nonzero if there is a
11444 gfc_impure_variable (gfc_symbol *sym)
11448 if (sym->attr.use_assoc || sym->attr.in_common)
11451 if (sym->ns != gfc_current_ns)
11452 return !sym->attr.function;
11454 proc = sym->ns->proc_name;
11455 if (sym->attr.dummy && gfc_pure (proc)
11456 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
11458 proc->attr.function))
11461 /* TODO: Sort out what can be storage associated, if anything, and include
11462 it here. In principle equivalences should be scanned but it does not
11463 seem to be possible to storage associate an impure variable this way. */
11468 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
11469 symbol of the current procedure. */
11472 gfc_pure (gfc_symbol *sym)
11474 symbol_attribute attr;
11477 sym = gfc_current_ns->proc_name;
11483 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
11487 /* Test whether the current procedure is elemental or not. */
11490 gfc_elemental (gfc_symbol *sym)
11492 symbol_attribute attr;
11495 sym = gfc_current_ns->proc_name;
11500 return attr.flavor == FL_PROCEDURE && attr.elemental;
11504 /* Warn about unused labels. */
11507 warn_unused_fortran_label (gfc_st_label *label)
11512 warn_unused_fortran_label (label->left);
11514 if (label->defined == ST_LABEL_UNKNOWN)
11517 switch (label->referenced)
11519 case ST_LABEL_UNKNOWN:
11520 gfc_warning ("Label %d at %L defined but not used", label->value,
11524 case ST_LABEL_BAD_TARGET:
11525 gfc_warning ("Label %d at %L defined but cannot be used",
11526 label->value, &label->where);
11533 warn_unused_fortran_label (label->right);
11537 /* Returns the sequence type of a symbol or sequence. */
11540 sequence_type (gfc_typespec ts)
11549 if (ts.u.derived->components == NULL)
11550 return SEQ_NONDEFAULT;
11552 result = sequence_type (ts.u.derived->components->ts);
11553 for (c = ts.u.derived->components->next; c; c = c->next)
11554 if (sequence_type (c->ts) != result)
11560 if (ts.kind != gfc_default_character_kind)
11561 return SEQ_NONDEFAULT;
11563 return SEQ_CHARACTER;
11566 if (ts.kind != gfc_default_integer_kind)
11567 return SEQ_NONDEFAULT;
11569 return SEQ_NUMERIC;
11572 if (!(ts.kind == gfc_default_real_kind
11573 || ts.kind == gfc_default_double_kind))
11574 return SEQ_NONDEFAULT;
11576 return SEQ_NUMERIC;
11579 if (ts.kind != gfc_default_complex_kind)
11580 return SEQ_NONDEFAULT;
11582 return SEQ_NUMERIC;
11585 if (ts.kind != gfc_default_logical_kind)
11586 return SEQ_NONDEFAULT;
11588 return SEQ_NUMERIC;
11591 return SEQ_NONDEFAULT;
11596 /* Resolve derived type EQUIVALENCE object. */
11599 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
11601 gfc_component *c = derived->components;
11606 /* Shall not be an object of nonsequence derived type. */
11607 if (!derived->attr.sequence)
11609 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
11610 "attribute to be an EQUIVALENCE object", sym->name,
11615 /* Shall not have allocatable components. */
11616 if (derived->attr.alloc_comp)
11618 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
11619 "components to be an EQUIVALENCE object",sym->name,
11624 if (sym->attr.in_common && has_default_initializer (sym->ts.u.derived))
11626 gfc_error ("Derived type variable '%s' at %L with default "
11627 "initialization cannot be in EQUIVALENCE with a variable "
11628 "in COMMON", sym->name, &e->where);
11632 for (; c ; c = c->next)
11634 if (c->ts.type == BT_DERIVED
11635 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
11638 /* Shall not be an object of sequence derived type containing a pointer
11639 in the structure. */
11640 if (c->attr.pointer)
11642 gfc_error ("Derived type variable '%s' at %L with pointer "
11643 "component(s) cannot be an EQUIVALENCE object",
11644 sym->name, &e->where);
11652 /* Resolve equivalence object.
11653 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
11654 an allocatable array, an object of nonsequence derived type, an object of
11655 sequence derived type containing a pointer at any level of component
11656 selection, an automatic object, a function name, an entry name, a result
11657 name, a named constant, a structure component, or a subobject of any of
11658 the preceding objects. A substring shall not have length zero. A
11659 derived type shall not have components with default initialization nor
11660 shall two objects of an equivalence group be initialized.
11661 Either all or none of the objects shall have an protected attribute.
11662 The simple constraints are done in symbol.c(check_conflict) and the rest
11663 are implemented here. */
11666 resolve_equivalence (gfc_equiv *eq)
11669 gfc_symbol *first_sym;
11672 locus *last_where = NULL;
11673 seq_type eq_type, last_eq_type;
11674 gfc_typespec *last_ts;
11675 int object, cnt_protected;
11676 const char *value_name;
11680 last_ts = &eq->expr->symtree->n.sym->ts;
11682 first_sym = eq->expr->symtree->n.sym;
11686 for (object = 1; eq; eq = eq->eq, object++)
11690 e->ts = e->symtree->n.sym->ts;
11691 /* match_varspec might not know yet if it is seeing
11692 array reference or substring reference, as it doesn't
11694 if (e->ref && e->ref->type == REF_ARRAY)
11696 gfc_ref *ref = e->ref;
11697 sym = e->symtree->n.sym;
11699 if (sym->attr.dimension)
11701 ref->u.ar.as = sym->as;
11705 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
11706 if (e->ts.type == BT_CHARACTER
11708 && ref->type == REF_ARRAY
11709 && ref->u.ar.dimen == 1
11710 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
11711 && ref->u.ar.stride[0] == NULL)
11713 gfc_expr *start = ref->u.ar.start[0];
11714 gfc_expr *end = ref->u.ar.end[0];
11717 /* Optimize away the (:) reference. */
11718 if (start == NULL && end == NULL)
11721 e->ref = ref->next;
11723 e->ref->next = ref->next;
11728 ref->type = REF_SUBSTRING;
11730 start = gfc_int_expr (1);
11731 ref->u.ss.start = start;
11732 if (end == NULL && e->ts.u.cl)
11733 end = gfc_copy_expr (e->ts.u.cl->length);
11734 ref->u.ss.end = end;
11735 ref->u.ss.length = e->ts.u.cl;
11742 /* Any further ref is an error. */
11745 gcc_assert (ref->type == REF_ARRAY);
11746 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
11752 if (gfc_resolve_expr (e) == FAILURE)
11755 sym = e->symtree->n.sym;
11757 if (sym->attr.is_protected)
11759 if (cnt_protected > 0 && cnt_protected != object)
11761 gfc_error ("Either all or none of the objects in the "
11762 "EQUIVALENCE set at %L shall have the "
11763 "PROTECTED attribute",
11768 /* Shall not equivalence common block variables in a PURE procedure. */
11769 if (sym->ns->proc_name
11770 && sym->ns->proc_name->attr.pure
11771 && sym->attr.in_common)
11773 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
11774 "object in the pure procedure '%s'",
11775 sym->name, &e->where, sym->ns->proc_name->name);
11779 /* Shall not be a named constant. */
11780 if (e->expr_type == EXPR_CONSTANT)
11782 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
11783 "object", sym->name, &e->where);
11787 if (e->ts.type == BT_DERIVED
11788 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
11791 /* Check that the types correspond correctly:
11793 A numeric sequence structure may be equivalenced to another sequence
11794 structure, an object of default integer type, default real type, double
11795 precision real type, default logical type such that components of the
11796 structure ultimately only become associated to objects of the same
11797 kind. A character sequence structure may be equivalenced to an object
11798 of default character kind or another character sequence structure.
11799 Other objects may be equivalenced only to objects of the same type and
11800 kind parameters. */
11802 /* Identical types are unconditionally OK. */
11803 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
11804 goto identical_types;
11806 last_eq_type = sequence_type (*last_ts);
11807 eq_type = sequence_type (sym->ts);
11809 /* Since the pair of objects is not of the same type, mixed or
11810 non-default sequences can be rejected. */
11812 msg = "Sequence %s with mixed components in EQUIVALENCE "
11813 "statement at %L with different type objects";
11815 && last_eq_type == SEQ_MIXED
11816 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
11818 || (eq_type == SEQ_MIXED
11819 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11820 &e->where) == FAILURE))
11823 msg = "Non-default type object or sequence %s in EQUIVALENCE "
11824 "statement at %L with objects of different type";
11826 && last_eq_type == SEQ_NONDEFAULT
11827 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
11828 last_where) == FAILURE)
11829 || (eq_type == SEQ_NONDEFAULT
11830 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11831 &e->where) == FAILURE))
11834 msg ="Non-CHARACTER object '%s' in default CHARACTER "
11835 "EQUIVALENCE statement at %L";
11836 if (last_eq_type == SEQ_CHARACTER
11837 && eq_type != SEQ_CHARACTER
11838 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11839 &e->where) == FAILURE)
11842 msg ="Non-NUMERIC object '%s' in default NUMERIC "
11843 "EQUIVALENCE statement at %L";
11844 if (last_eq_type == SEQ_NUMERIC
11845 && eq_type != SEQ_NUMERIC
11846 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11847 &e->where) == FAILURE)
11852 last_where = &e->where;
11857 /* Shall not be an automatic array. */
11858 if (e->ref->type == REF_ARRAY
11859 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
11861 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
11862 "an EQUIVALENCE object", sym->name, &e->where);
11869 /* Shall not be a structure component. */
11870 if (r->type == REF_COMPONENT)
11872 gfc_error ("Structure component '%s' at %L cannot be an "
11873 "EQUIVALENCE object",
11874 r->u.c.component->name, &e->where);
11878 /* A substring shall not have length zero. */
11879 if (r->type == REF_SUBSTRING)
11881 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
11883 gfc_error ("Substring at %L has length zero",
11884 &r->u.ss.start->where);
11894 /* Resolve function and ENTRY types, issue diagnostics if needed. */
11897 resolve_fntype (gfc_namespace *ns)
11899 gfc_entry_list *el;
11902 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
11905 /* If there are any entries, ns->proc_name is the entry master
11906 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
11908 sym = ns->entries->sym;
11910 sym = ns->proc_name;
11911 if (sym->result == sym
11912 && sym->ts.type == BT_UNKNOWN
11913 && gfc_set_default_type (sym, 0, NULL) == FAILURE
11914 && !sym->attr.untyped)
11916 gfc_error ("Function '%s' at %L has no IMPLICIT type",
11917 sym->name, &sym->declared_at);
11918 sym->attr.untyped = 1;
11921 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
11922 && !sym->attr.contained
11923 && !gfc_check_access (sym->ts.u.derived->attr.access,
11924 sym->ts.u.derived->ns->default_access)
11925 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11927 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
11928 "%L of PRIVATE type '%s'", sym->name,
11929 &sym->declared_at, sym->ts.u.derived->name);
11933 for (el = ns->entries->next; el; el = el->next)
11935 if (el->sym->result == el->sym
11936 && el->sym->ts.type == BT_UNKNOWN
11937 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
11938 && !el->sym->attr.untyped)
11940 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
11941 el->sym->name, &el->sym->declared_at);
11942 el->sym->attr.untyped = 1;
11948 /* 12.3.2.1.1 Defined operators. */
11951 check_uop_procedure (gfc_symbol *sym, locus where)
11953 gfc_formal_arglist *formal;
11955 if (!sym->attr.function)
11957 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
11958 sym->name, &where);
11962 if (sym->ts.type == BT_CHARACTER
11963 && !(sym->ts.u.cl && sym->ts.u.cl->length)
11964 && !(sym->result && sym->result->ts.u.cl
11965 && sym->result->ts.u.cl->length))
11967 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
11968 "character length", sym->name, &where);
11972 formal = sym->formal;
11973 if (!formal || !formal->sym)
11975 gfc_error ("User operator procedure '%s' at %L must have at least "
11976 "one argument", sym->name, &where);
11980 if (formal->sym->attr.intent != INTENT_IN)
11982 gfc_error ("First argument of operator interface at %L must be "
11983 "INTENT(IN)", &where);
11987 if (formal->sym->attr.optional)
11989 gfc_error ("First argument of operator interface at %L cannot be "
11990 "optional", &where);
11994 formal = formal->next;
11995 if (!formal || !formal->sym)
11998 if (formal->sym->attr.intent != INTENT_IN)
12000 gfc_error ("Second argument of operator interface at %L must be "
12001 "INTENT(IN)", &where);
12005 if (formal->sym->attr.optional)
12007 gfc_error ("Second argument of operator interface at %L cannot be "
12008 "optional", &where);
12014 gfc_error ("Operator interface at %L must have, at most, two "
12015 "arguments", &where);
12023 gfc_resolve_uops (gfc_symtree *symtree)
12025 gfc_interface *itr;
12027 if (symtree == NULL)
12030 gfc_resolve_uops (symtree->left);
12031 gfc_resolve_uops (symtree->right);
12033 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12034 check_uop_procedure (itr->sym, itr->sym->declared_at);
12038 /* Examine all of the expressions associated with a program unit,
12039 assign types to all intermediate expressions, make sure that all
12040 assignments are to compatible types and figure out which names
12041 refer to which functions or subroutines. It doesn't check code
12042 block, which is handled by resolve_code. */
12045 resolve_types (gfc_namespace *ns)
12051 gfc_namespace* old_ns = gfc_current_ns;
12053 /* Check that all IMPLICIT types are ok. */
12054 if (!ns->seen_implicit_none)
12057 for (letter = 0; letter != GFC_LETTERS; ++letter)
12058 if (ns->set_flag[letter]
12059 && resolve_typespec_used (&ns->default_type[letter],
12060 &ns->implicit_loc[letter],
12065 gfc_current_ns = ns;
12067 resolve_entries (ns);
12069 resolve_common_vars (ns->blank_common.head, false);
12070 resolve_common_blocks (ns->common_root);
12072 resolve_contained_functions (ns);
12074 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12076 for (cl = ns->cl_list; cl; cl = cl->next)
12077 resolve_charlen (cl);
12079 gfc_traverse_ns (ns, resolve_symbol);
12081 resolve_fntype (ns);
12083 for (n = ns->contained; n; n = n->sibling)
12085 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12086 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12087 "also be PURE", n->proc_name->name,
12088 &n->proc_name->declared_at);
12094 gfc_check_interfaces (ns);
12096 gfc_traverse_ns (ns, resolve_values);
12102 for (d = ns->data; d; d = d->next)
12106 gfc_traverse_ns (ns, gfc_formalize_init_value);
12108 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12110 if (ns->common_root != NULL)
12111 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12113 for (eq = ns->equiv; eq; eq = eq->next)
12114 resolve_equivalence (eq);
12116 /* Warn about unused labels. */
12117 if (warn_unused_label)
12118 warn_unused_fortran_label (ns->st_labels);
12120 gfc_resolve_uops (ns->uop_root);
12122 gfc_current_ns = old_ns;
12126 /* Call resolve_code recursively. */
12129 resolve_codes (gfc_namespace *ns)
12132 bitmap_obstack old_obstack;
12134 for (n = ns->contained; n; n = n->sibling)
12137 gfc_current_ns = ns;
12139 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
12140 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
12143 /* Set to an out of range value. */
12144 current_entry_id = -1;
12146 old_obstack = labels_obstack;
12147 bitmap_obstack_initialize (&labels_obstack);
12149 resolve_code (ns->code, ns);
12151 bitmap_obstack_release (&labels_obstack);
12152 labels_obstack = old_obstack;
12156 /* This function is called after a complete program unit has been compiled.
12157 Its purpose is to examine all of the expressions associated with a program
12158 unit, assign types to all intermediate expressions, make sure that all
12159 assignments are to compatible types and figure out which names refer to
12160 which functions or subroutines. */
12163 gfc_resolve (gfc_namespace *ns)
12165 gfc_namespace *old_ns;
12166 code_stack *old_cs_base;
12172 old_ns = gfc_current_ns;
12173 old_cs_base = cs_base;
12175 resolve_types (ns);
12176 resolve_codes (ns);
12178 gfc_current_ns = old_ns;
12179 cs_base = old_cs_base;