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->class_object
5166 list_e->value.function.class_esym->esym
5167 = e->value.function.esym;
5172 /* Burrow down into grandchildren types. */
5173 if (derived->f2k_derived)
5174 gfc_traverse_ns (derived->f2k_derived, check_members);
5178 /* Eliminate esym_lists where all the members point to the
5179 typebound procedure of the declared type; ie. one where
5180 type selection has no effect.. */
5182 resolve_class_esym (gfc_expr *e)
5184 gfc_class_esym_list *p, *q;
5187 gcc_assert (e && e->expr_type == EXPR_FUNCTION);
5189 p = e->value.function.class_esym;
5193 for (; p; p = p->next)
5194 empty = empty && (e->value.function.esym == p->esym);
5198 p = e->value.function.class_esym;
5204 e->value.function.class_esym = NULL;
5209 /* Resolve a CLASS typebound function, or 'method'. */
5211 resolve_class_compcall (gfc_expr* e)
5213 gfc_symbol *derived;
5215 class_object = e->symtree->n.sym;
5217 /* Get the CLASS type. */
5218 derived = e->symtree->n.sym->ts.u.derived;
5220 /* Get the data component, which is of the declared type. */
5221 derived = derived->components->ts.u.derived;
5223 /* Resolve the function call for each member of the class. */
5224 class_try = SUCCESS;
5226 list_e = gfc_copy_expr (e);
5227 check_class_members (derived);
5229 class_try = (resolve_compcall (e, true) == SUCCESS)
5230 ? class_try : FAILURE;
5232 /* Transfer the class list to the original expression. Note that
5233 the class_esym list is cleaned up in trans-expr.c, as the calls
5235 e->value.function.class_esym = list_e->value.function.class_esym;
5236 list_e->value.function.class_esym = NULL;
5237 gfc_free_expr (list_e);
5239 resolve_class_esym (e);
5244 /* Resolve a CLASS typebound subroutine, or 'method'. */
5246 resolve_class_typebound_call (gfc_code *code)
5248 gfc_symbol *derived;
5250 class_object = code->expr1->symtree->n.sym;
5252 /* Get the CLASS type. */
5253 derived = code->expr1->symtree->n.sym->ts.u.derived;
5255 /* Get the data component, which is of the declared type. */
5256 derived = derived->components->ts.u.derived;
5258 class_try = SUCCESS;
5260 list_e = gfc_copy_expr (code->expr1);
5261 check_class_members (derived);
5263 class_try = (resolve_typebound_call (code) == SUCCESS)
5264 ? class_try : FAILURE;
5266 /* Transfer the class list to the original expression. Note that
5267 the class_esym list is cleaned up in trans-expr.c, as the calls
5269 code->expr1->value.function.class_esym
5270 = list_e->value.function.class_esym;
5271 list_e->value.function.class_esym = NULL;
5272 gfc_free_expr (list_e);
5274 resolve_class_esym (code->expr1);
5280 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5283 resolve_ppc_call (gfc_code* c)
5285 gfc_component *comp;
5288 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5291 c->resolved_sym = c->expr1->symtree->n.sym;
5292 c->expr1->expr_type = EXPR_VARIABLE;
5294 if (!comp->attr.subroutine)
5295 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5297 if (resolve_ref (c->expr1) == FAILURE)
5300 if (update_ppc_arglist (c->expr1) == FAILURE)
5303 c->ext.actual = c->expr1->value.compcall.actual;
5305 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5306 comp->formal == NULL) == FAILURE)
5309 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5315 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5318 resolve_expr_ppc (gfc_expr* e)
5320 gfc_component *comp;
5323 b = gfc_is_proc_ptr_comp (e, &comp);
5326 /* Convert to EXPR_FUNCTION. */
5327 e->expr_type = EXPR_FUNCTION;
5328 e->value.function.isym = NULL;
5329 e->value.function.actual = e->value.compcall.actual;
5331 if (comp->as != NULL)
5332 e->rank = comp->as->rank;
5334 if (!comp->attr.function)
5335 gfc_add_function (&comp->attr, comp->name, &e->where);
5337 if (resolve_ref (e) == FAILURE)
5340 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5341 comp->formal == NULL) == FAILURE)
5344 if (update_ppc_arglist (e) == FAILURE)
5347 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5353 /* Resolve an expression. That is, make sure that types of operands agree
5354 with their operators, intrinsic operators are converted to function calls
5355 for overloaded types and unresolved function references are resolved. */
5358 gfc_resolve_expr (gfc_expr *e)
5365 switch (e->expr_type)
5368 t = resolve_operator (e);
5374 if (check_host_association (e))
5375 t = resolve_function (e);
5378 t = resolve_variable (e);
5380 expression_rank (e);
5383 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5384 && e->ref->type != REF_SUBSTRING)
5385 gfc_resolve_substring_charlen (e);
5390 if (e->symtree && e->symtree->n.sym->ts.type == BT_CLASS)
5391 t = resolve_class_compcall (e);
5393 t = resolve_compcall (e, true);
5396 case EXPR_SUBSTRING:
5397 t = resolve_ref (e);
5406 t = resolve_expr_ppc (e);
5411 if (resolve_ref (e) == FAILURE)
5414 t = gfc_resolve_array_constructor (e);
5415 /* Also try to expand a constructor. */
5418 expression_rank (e);
5419 gfc_expand_constructor (e);
5422 /* This provides the opportunity for the length of constructors with
5423 character valued function elements to propagate the string length
5424 to the expression. */
5425 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5426 t = gfc_resolve_character_array_constructor (e);
5430 case EXPR_STRUCTURE:
5431 t = resolve_ref (e);
5435 t = resolve_structure_cons (e);
5439 t = gfc_simplify_expr (e, 0);
5443 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5446 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5453 /* Resolve an expression from an iterator. They must be scalar and have
5454 INTEGER or (optionally) REAL type. */
5457 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5458 const char *name_msgid)
5460 if (gfc_resolve_expr (expr) == FAILURE)
5463 if (expr->rank != 0)
5465 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5469 if (expr->ts.type != BT_INTEGER)
5471 if (expr->ts.type == BT_REAL)
5474 return gfc_notify_std (GFC_STD_F95_DEL,
5475 "Deleted feature: %s at %L must be integer",
5476 _(name_msgid), &expr->where);
5479 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5486 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5494 /* Resolve the expressions in an iterator structure. If REAL_OK is
5495 false allow only INTEGER type iterators, otherwise allow REAL types. */
5498 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5500 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5504 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5506 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5511 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5512 "Start expression in DO loop") == FAILURE)
5515 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5516 "End expression in DO loop") == FAILURE)
5519 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5520 "Step expression in DO loop") == FAILURE)
5523 if (iter->step->expr_type == EXPR_CONSTANT)
5525 if ((iter->step->ts.type == BT_INTEGER
5526 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5527 || (iter->step->ts.type == BT_REAL
5528 && mpfr_sgn (iter->step->value.real) == 0))
5530 gfc_error ("Step expression in DO loop at %L cannot be zero",
5531 &iter->step->where);
5536 /* Convert start, end, and step to the same type as var. */
5537 if (iter->start->ts.kind != iter->var->ts.kind
5538 || iter->start->ts.type != iter->var->ts.type)
5539 gfc_convert_type (iter->start, &iter->var->ts, 2);
5541 if (iter->end->ts.kind != iter->var->ts.kind
5542 || iter->end->ts.type != iter->var->ts.type)
5543 gfc_convert_type (iter->end, &iter->var->ts, 2);
5545 if (iter->step->ts.kind != iter->var->ts.kind
5546 || iter->step->ts.type != iter->var->ts.type)
5547 gfc_convert_type (iter->step, &iter->var->ts, 2);
5549 if (iter->start->expr_type == EXPR_CONSTANT
5550 && iter->end->expr_type == EXPR_CONSTANT
5551 && iter->step->expr_type == EXPR_CONSTANT)
5554 if (iter->start->ts.type == BT_INTEGER)
5556 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5557 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5561 sgn = mpfr_sgn (iter->step->value.real);
5562 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5564 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5565 gfc_warning ("DO loop at %L will be executed zero times",
5566 &iter->step->where);
5573 /* Traversal function for find_forall_index. f == 2 signals that
5574 that variable itself is not to be checked - only the references. */
5577 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5579 if (expr->expr_type != EXPR_VARIABLE)
5582 /* A scalar assignment */
5583 if (!expr->ref || *f == 1)
5585 if (expr->symtree->n.sym == sym)
5597 /* Check whether the FORALL index appears in the expression or not.
5598 Returns SUCCESS if SYM is found in EXPR. */
5601 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5603 if (gfc_traverse_expr (expr, sym, forall_index, f))
5610 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5611 to be a scalar INTEGER variable. The subscripts and stride are scalar
5612 INTEGERs, and if stride is a constant it must be nonzero.
5613 Furthermore "A subscript or stride in a forall-triplet-spec shall
5614 not contain a reference to any index-name in the
5615 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5618 resolve_forall_iterators (gfc_forall_iterator *it)
5620 gfc_forall_iterator *iter, *iter2;
5622 for (iter = it; iter; iter = iter->next)
5624 if (gfc_resolve_expr (iter->var) == SUCCESS
5625 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5626 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5629 if (gfc_resolve_expr (iter->start) == SUCCESS
5630 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5631 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5632 &iter->start->where);
5633 if (iter->var->ts.kind != iter->start->ts.kind)
5634 gfc_convert_type (iter->start, &iter->var->ts, 2);
5636 if (gfc_resolve_expr (iter->end) == SUCCESS
5637 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5638 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5640 if (iter->var->ts.kind != iter->end->ts.kind)
5641 gfc_convert_type (iter->end, &iter->var->ts, 2);
5643 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5645 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5646 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5647 &iter->stride->where, "INTEGER");
5649 if (iter->stride->expr_type == EXPR_CONSTANT
5650 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5651 gfc_error ("FORALL stride expression at %L cannot be zero",
5652 &iter->stride->where);
5654 if (iter->var->ts.kind != iter->stride->ts.kind)
5655 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5658 for (iter = it; iter; iter = iter->next)
5659 for (iter2 = iter; iter2; iter2 = iter2->next)
5661 if (find_forall_index (iter2->start,
5662 iter->var->symtree->n.sym, 0) == SUCCESS
5663 || find_forall_index (iter2->end,
5664 iter->var->symtree->n.sym, 0) == SUCCESS
5665 || find_forall_index (iter2->stride,
5666 iter->var->symtree->n.sym, 0) == SUCCESS)
5667 gfc_error ("FORALL index '%s' may not appear in triplet "
5668 "specification at %L", iter->var->symtree->name,
5669 &iter2->start->where);
5674 /* Given a pointer to a symbol that is a derived type, see if it's
5675 inaccessible, i.e. if it's defined in another module and the components are
5676 PRIVATE. The search is recursive if necessary. Returns zero if no
5677 inaccessible components are found, nonzero otherwise. */
5680 derived_inaccessible (gfc_symbol *sym)
5684 if (sym->attr.use_assoc && sym->attr.private_comp)
5687 for (c = sym->components; c; c = c->next)
5689 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
5697 /* Resolve the argument of a deallocate expression. The expression must be
5698 a pointer or a full array. */
5701 resolve_deallocate_expr (gfc_expr *e)
5703 symbol_attribute attr;
5704 int allocatable, pointer, check_intent_in;
5709 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5710 check_intent_in = 1;
5712 if (gfc_resolve_expr (e) == FAILURE)
5715 if (e->expr_type != EXPR_VARIABLE)
5718 sym = e->symtree->n.sym;
5720 if (sym->ts.type == BT_CLASS)
5722 allocatable = sym->ts.u.derived->components->attr.allocatable;
5723 pointer = sym->ts.u.derived->components->attr.pointer;
5727 allocatable = sym->attr.allocatable;
5728 pointer = sym->attr.pointer;
5730 for (ref = e->ref; ref; ref = ref->next)
5733 check_intent_in = 0;
5738 if (ref->u.ar.type != AR_FULL)
5743 c = ref->u.c.component;
5744 if (c->ts.type == BT_CLASS)
5746 allocatable = c->ts.u.derived->components->attr.allocatable;
5747 pointer = c->ts.u.derived->components->attr.pointer;
5751 allocatable = c->attr.allocatable;
5752 pointer = c->attr.pointer;
5762 attr = gfc_expr_attr (e);
5764 if (allocatable == 0 && attr.pointer == 0)
5767 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5771 if (check_intent_in && sym->attr.intent == INTENT_IN)
5773 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5774 sym->name, &e->where);
5778 if (e->ts.type == BT_CLASS)
5780 /* Only deallocate the DATA component. */
5781 gfc_add_component_ref (e, "$data");
5788 /* Returns true if the expression e contains a reference to the symbol sym. */
5790 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5792 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
5799 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
5801 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
5805 /* Given the expression node e for an allocatable/pointer of derived type to be
5806 allocated, get the expression node to be initialized afterwards (needed for
5807 derived types with default initializers, and derived types with allocatable
5808 components that need nullification.) */
5811 gfc_expr_to_initialize (gfc_expr *e)
5817 result = gfc_copy_expr (e);
5819 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
5820 for (ref = result->ref; ref; ref = ref->next)
5821 if (ref->type == REF_ARRAY && ref->next == NULL)
5823 ref->u.ar.type = AR_FULL;
5825 for (i = 0; i < ref->u.ar.dimen; i++)
5826 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
5828 result->rank = ref->u.ar.dimen;
5836 /* Resolve the expression in an ALLOCATE statement, doing the additional
5837 checks to see whether the expression is OK or not. The expression must
5838 have a trailing array reference that gives the size of the array. */
5841 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
5843 int i, pointer, allocatable, dimension, check_intent_in;
5844 symbol_attribute attr;
5845 gfc_ref *ref, *ref2;
5852 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5853 check_intent_in = 1;
5855 if (gfc_resolve_expr (e) == FAILURE)
5858 /* Make sure the expression is allocatable or a pointer. If it is
5859 pointer, the next-to-last reference must be a pointer. */
5863 sym = e->symtree->n.sym;
5865 if (e->expr_type != EXPR_VARIABLE)
5868 attr = gfc_expr_attr (e);
5869 pointer = attr.pointer;
5870 dimension = attr.dimension;
5874 if (sym->ts.type == BT_CLASS)
5876 allocatable = sym->ts.u.derived->components->attr.allocatable;
5877 pointer = sym->ts.u.derived->components->attr.pointer;
5878 dimension = sym->ts.u.derived->components->attr.dimension;
5882 allocatable = sym->attr.allocatable;
5883 pointer = sym->attr.pointer;
5884 dimension = sym->attr.dimension;
5887 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
5890 check_intent_in = 0;
5895 if (ref->next != NULL)
5900 c = ref->u.c.component;
5901 if (c->ts.type == BT_CLASS)
5903 allocatable = c->ts.u.derived->components->attr.allocatable;
5904 pointer = c->ts.u.derived->components->attr.pointer;
5905 dimension = c->ts.u.derived->components->attr.dimension;
5909 allocatable = c->attr.allocatable;
5910 pointer = c->attr.pointer;
5911 dimension = c->attr.dimension;
5923 if (allocatable == 0 && pointer == 0)
5925 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5930 if (check_intent_in && sym->attr.intent == INTENT_IN)
5932 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
5933 sym->name, &e->where);
5937 if (e->ts.type == BT_CLASS)
5939 /* Initialize VINDEX for CLASS objects. */
5940 init_st = gfc_get_code ();
5941 init_st->loc = code->loc;
5942 init_st->expr1 = gfc_expr_to_initialize (e);
5943 init_st->op = EXEC_ASSIGN;
5944 gfc_add_component_ref (init_st->expr1, "$vindex");
5945 if (code->expr3 && code->expr3->ts.type == BT_CLASS)
5947 /* vindex must be determined at run time. */
5948 init_st->expr2 = gfc_copy_expr (code->expr3);
5949 gfc_add_component_ref (init_st->expr2, "$vindex");
5953 /* vindex is fixed at compile time. */
5956 vindex = code->expr3->ts.u.derived->vindex;
5957 else if (code->ext.alloc.ts.type == BT_DERIVED)
5958 vindex = code->ext.alloc.ts.u.derived->vindex;
5959 else if (e->ts.type == BT_CLASS)
5960 vindex = e->ts.u.derived->components->ts.u.derived->vindex;
5962 vindex = e->ts.u.derived->vindex;
5963 init_st->expr2 = gfc_int_expr (vindex);
5965 init_st->expr2->where = init_st->expr1->where = init_st->loc;
5966 init_st->next = code->next;
5967 code->next = init_st;
5968 /* Only allocate the DATA component. */
5969 gfc_add_component_ref (e, "$data");
5972 if (pointer || dimension == 0)
5975 /* Make sure the next-to-last reference node is an array specification. */
5977 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
5979 gfc_error ("Array specification required in ALLOCATE statement "
5980 "at %L", &e->where);
5984 /* Make sure that the array section reference makes sense in the
5985 context of an ALLOCATE specification. */
5989 for (i = 0; i < ar->dimen; i++)
5991 if (ref2->u.ar.type == AR_ELEMENT)
5994 switch (ar->dimen_type[i])
6000 if (ar->start[i] != NULL
6001 && ar->end[i] != NULL
6002 && ar->stride[i] == NULL)
6005 /* Fall Through... */
6009 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6016 for (a = code->ext.alloc.list; a; a = a->next)
6018 sym = a->expr->symtree->n.sym;
6020 /* TODO - check derived type components. */
6021 if (sym->ts.type == BT_DERIVED)
6024 if ((ar->start[i] != NULL
6025 && gfc_find_sym_in_expr (sym, ar->start[i]))
6026 || (ar->end[i] != NULL
6027 && gfc_find_sym_in_expr (sym, ar->end[i])))
6029 gfc_error ("'%s' must not appear in the array specification at "
6030 "%L in the same ALLOCATE statement where it is "
6031 "itself allocated", sym->name, &ar->where);
6041 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6043 gfc_expr *stat, *errmsg, *pe, *qe;
6044 gfc_alloc *a, *p, *q;
6046 stat = code->expr1 ? code->expr1 : NULL;
6048 errmsg = code->expr2 ? code->expr2 : NULL;
6050 /* Check the stat variable. */
6053 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6054 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6055 stat->symtree->n.sym->name, &stat->where);
6057 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6058 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6061 if ((stat->ts.type != BT_INTEGER
6062 && !(stat->ref && (stat->ref->type == REF_ARRAY
6063 || stat->ref->type == REF_COMPONENT)))
6065 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6066 "variable", &stat->where);
6068 for (p = code->ext.alloc.list; p; p = p->next)
6069 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6070 gfc_error ("Stat-variable at %L shall not be %sd within "
6071 "the same %s statement", &stat->where, fcn, fcn);
6074 /* Check the errmsg variable. */
6078 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6081 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6082 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6083 errmsg->symtree->n.sym->name, &errmsg->where);
6085 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6086 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6089 if ((errmsg->ts.type != BT_CHARACTER
6091 && (errmsg->ref->type == REF_ARRAY
6092 || errmsg->ref->type == REF_COMPONENT)))
6093 || errmsg->rank > 0 )
6094 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6095 "variable", &errmsg->where);
6097 for (p = code->ext.alloc.list; p; p = p->next)
6098 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6099 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6100 "the same %s statement", &errmsg->where, fcn, fcn);
6103 /* Check that an allocate-object appears only once in the statement.
6104 FIXME: Checking derived types is disabled. */
6105 for (p = code->ext.alloc.list; p; p = p->next)
6108 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6109 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6111 for (q = p->next; q; q = q->next)
6114 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6115 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6116 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6117 gfc_error ("Allocate-object at %L also appears at %L",
6118 &pe->where, &qe->where);
6123 if (strcmp (fcn, "ALLOCATE") == 0)
6125 for (a = code->ext.alloc.list; a; a = a->next)
6126 resolve_allocate_expr (a->expr, code);
6130 for (a = code->ext.alloc.list; a; a = a->next)
6131 resolve_deallocate_expr (a->expr);
6136 /************ SELECT CASE resolution subroutines ************/
6138 /* Callback function for our mergesort variant. Determines interval
6139 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6140 op1 > op2. Assumes we're not dealing with the default case.
6141 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6142 There are nine situations to check. */
6145 compare_cases (const gfc_case *op1, const gfc_case *op2)
6149 if (op1->low == NULL) /* op1 = (:L) */
6151 /* op2 = (:N), so overlap. */
6153 /* op2 = (M:) or (M:N), L < M */
6154 if (op2->low != NULL
6155 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6158 else if (op1->high == NULL) /* op1 = (K:) */
6160 /* op2 = (M:), so overlap. */
6162 /* op2 = (:N) or (M:N), K > N */
6163 if (op2->high != NULL
6164 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6167 else /* op1 = (K:L) */
6169 if (op2->low == NULL) /* op2 = (:N), K > N */
6170 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6172 else if (op2->high == NULL) /* op2 = (M:), L < M */
6173 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6175 else /* op2 = (M:N) */
6179 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6182 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6191 /* Merge-sort a double linked case list, detecting overlap in the
6192 process. LIST is the head of the double linked case list before it
6193 is sorted. Returns the head of the sorted list if we don't see any
6194 overlap, or NULL otherwise. */
6197 check_case_overlap (gfc_case *list)
6199 gfc_case *p, *q, *e, *tail;
6200 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6202 /* If the passed list was empty, return immediately. */
6209 /* Loop unconditionally. The only exit from this loop is a return
6210 statement, when we've finished sorting the case list. */
6217 /* Count the number of merges we do in this pass. */
6220 /* Loop while there exists a merge to be done. */
6225 /* Count this merge. */
6228 /* Cut the list in two pieces by stepping INSIZE places
6229 forward in the list, starting from P. */
6232 for (i = 0; i < insize; i++)
6241 /* Now we have two lists. Merge them! */
6242 while (psize > 0 || (qsize > 0 && q != NULL))
6244 /* See from which the next case to merge comes from. */
6247 /* P is empty so the next case must come from Q. */
6252 else if (qsize == 0 || q == NULL)
6261 cmp = compare_cases (p, q);
6264 /* The whole case range for P is less than the
6272 /* The whole case range for Q is greater than
6273 the case range for P. */
6280 /* The cases overlap, or they are the same
6281 element in the list. Either way, we must
6282 issue an error and get the next case from P. */
6283 /* FIXME: Sort P and Q by line number. */
6284 gfc_error ("CASE label at %L overlaps with CASE "
6285 "label at %L", &p->where, &q->where);
6293 /* Add the next element to the merged list. */
6302 /* P has now stepped INSIZE places along, and so has Q. So
6303 they're the same. */
6308 /* If we have done only one merge or none at all, we've
6309 finished sorting the cases. */
6318 /* Otherwise repeat, merging lists twice the size. */
6324 /* Check to see if an expression is suitable for use in a CASE statement.
6325 Makes sure that all case expressions are scalar constants of the same
6326 type. Return FAILURE if anything is wrong. */
6329 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6331 if (e == NULL) return SUCCESS;
6333 if (e->ts.type != case_expr->ts.type)
6335 gfc_error ("Expression in CASE statement at %L must be of type %s",
6336 &e->where, gfc_basic_typename (case_expr->ts.type));
6340 /* C805 (R808) For a given case-construct, each case-value shall be of
6341 the same type as case-expr. For character type, length differences
6342 are allowed, but the kind type parameters shall be the same. */
6344 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6346 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6347 &e->where, case_expr->ts.kind);
6351 /* Convert the case value kind to that of case expression kind, if needed.
6352 FIXME: Should a warning be issued? */
6353 if (e->ts.kind != case_expr->ts.kind)
6354 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6358 gfc_error ("Expression in CASE statement at %L must be scalar",
6367 /* Given a completely parsed select statement, we:
6369 - Validate all expressions and code within the SELECT.
6370 - Make sure that the selection expression is not of the wrong type.
6371 - Make sure that no case ranges overlap.
6372 - Eliminate unreachable cases and unreachable code resulting from
6373 removing case labels.
6375 The standard does allow unreachable cases, e.g. CASE (5:3). But
6376 they are a hassle for code generation, and to prevent that, we just
6377 cut them out here. This is not necessary for overlapping cases
6378 because they are illegal and we never even try to generate code.
6380 We have the additional caveat that a SELECT construct could have
6381 been a computed GOTO in the source code. Fortunately we can fairly
6382 easily work around that here: The case_expr for a "real" SELECT CASE
6383 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6384 we have to do is make sure that the case_expr is a scalar integer
6388 resolve_select (gfc_code *code)
6391 gfc_expr *case_expr;
6392 gfc_case *cp, *default_case, *tail, *head;
6393 int seen_unreachable;
6399 if (code->expr1 == NULL)
6401 /* This was actually a computed GOTO statement. */
6402 case_expr = code->expr2;
6403 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6404 gfc_error ("Selection expression in computed GOTO statement "
6405 "at %L must be a scalar integer expression",
6408 /* Further checking is not necessary because this SELECT was built
6409 by the compiler, so it should always be OK. Just move the
6410 case_expr from expr2 to expr so that we can handle computed
6411 GOTOs as normal SELECTs from here on. */
6412 code->expr1 = code->expr2;
6417 case_expr = code->expr1;
6419 type = case_expr->ts.type;
6420 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6422 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6423 &case_expr->where, gfc_typename (&case_expr->ts));
6425 /* Punt. Going on here just produce more garbage error messages. */
6429 if (case_expr->rank != 0)
6431 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6432 "expression", &case_expr->where);
6438 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6439 of the SELECT CASE expression and its CASE values. Walk the lists
6440 of case values, and if we find a mismatch, promote case_expr to
6441 the appropriate kind. */
6443 if (type == BT_LOGICAL || type == BT_INTEGER)
6445 for (body = code->block; body; body = body->block)
6447 /* Walk the case label list. */
6448 for (cp = body->ext.case_list; cp; cp = cp->next)
6450 /* Intercept the DEFAULT case. It does not have a kind. */
6451 if (cp->low == NULL && cp->high == NULL)
6454 /* Unreachable case ranges are discarded, so ignore. */
6455 if (cp->low != NULL && cp->high != NULL
6456 && cp->low != cp->high
6457 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6460 /* FIXME: Should a warning be issued? */
6462 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6463 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6465 if (cp->high != NULL
6466 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6467 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6472 /* Assume there is no DEFAULT case. */
6473 default_case = NULL;
6478 for (body = code->block; body; body = body->block)
6480 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6482 seen_unreachable = 0;
6484 /* Walk the case label list, making sure that all case labels
6486 for (cp = body->ext.case_list; cp; cp = cp->next)
6488 /* Count the number of cases in the whole construct. */
6491 /* Intercept the DEFAULT case. */
6492 if (cp->low == NULL && cp->high == NULL)
6494 if (default_case != NULL)
6496 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6497 "by a second DEFAULT CASE at %L",
6498 &default_case->where, &cp->where);
6509 /* Deal with single value cases and case ranges. Errors are
6510 issued from the validation function. */
6511 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
6512 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
6518 if (type == BT_LOGICAL
6519 && ((cp->low == NULL || cp->high == NULL)
6520 || cp->low != cp->high))
6522 gfc_error ("Logical range in CASE statement at %L is not "
6523 "allowed", &cp->low->where);
6528 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
6531 value = cp->low->value.logical == 0 ? 2 : 1;
6532 if (value & seen_logical)
6534 gfc_error ("constant logical value in CASE statement "
6535 "is repeated at %L",
6540 seen_logical |= value;
6543 if (cp->low != NULL && cp->high != NULL
6544 && cp->low != cp->high
6545 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6547 if (gfc_option.warn_surprising)
6548 gfc_warning ("Range specification at %L can never "
6549 "be matched", &cp->where);
6551 cp->unreachable = 1;
6552 seen_unreachable = 1;
6556 /* If the case range can be matched, it can also overlap with
6557 other cases. To make sure it does not, we put it in a
6558 double linked list here. We sort that with a merge sort
6559 later on to detect any overlapping cases. */
6563 head->right = head->left = NULL;
6568 tail->right->left = tail;
6575 /* It there was a failure in the previous case label, give up
6576 for this case label list. Continue with the next block. */
6580 /* See if any case labels that are unreachable have been seen.
6581 If so, we eliminate them. This is a bit of a kludge because
6582 the case lists for a single case statement (label) is a
6583 single forward linked lists. */
6584 if (seen_unreachable)
6586 /* Advance until the first case in the list is reachable. */
6587 while (body->ext.case_list != NULL
6588 && body->ext.case_list->unreachable)
6590 gfc_case *n = body->ext.case_list;
6591 body->ext.case_list = body->ext.case_list->next;
6593 gfc_free_case_list (n);
6596 /* Strip all other unreachable cases. */
6597 if (body->ext.case_list)
6599 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6601 if (cp->next->unreachable)
6603 gfc_case *n = cp->next;
6604 cp->next = cp->next->next;
6606 gfc_free_case_list (n);
6613 /* See if there were overlapping cases. If the check returns NULL,
6614 there was overlap. In that case we don't do anything. If head
6615 is non-NULL, we prepend the DEFAULT case. The sorted list can
6616 then used during code generation for SELECT CASE constructs with
6617 a case expression of a CHARACTER type. */
6620 head = check_case_overlap (head);
6622 /* Prepend the default_case if it is there. */
6623 if (head != NULL && default_case)
6625 default_case->left = NULL;
6626 default_case->right = head;
6627 head->left = default_case;
6631 /* Eliminate dead blocks that may be the result if we've seen
6632 unreachable case labels for a block. */
6633 for (body = code; body && body->block; body = body->block)
6635 if (body->block->ext.case_list == NULL)
6637 /* Cut the unreachable block from the code chain. */
6638 gfc_code *c = body->block;
6639 body->block = c->block;
6641 /* Kill the dead block, but not the blocks below it. */
6643 gfc_free_statements (c);
6647 /* More than two cases is legal but insane for logical selects.
6648 Issue a warning for it. */
6649 if (gfc_option.warn_surprising && type == BT_LOGICAL
6651 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6656 /* Check if a derived type is extensible. */
6659 gfc_type_is_extensible (gfc_symbol *sym)
6661 return !(sym->attr.is_bind_c || sym->attr.sequence);
6665 /* Resolve a SELECT TYPE statement. */
6668 resolve_select_type (gfc_code *code)
6670 gfc_symbol *selector_type;
6671 gfc_code *body, *new_st;
6672 gfc_case *c, *default_case;
6674 char name[GFC_MAX_SYMBOL_LEN];
6681 selector_type = code->expr2->ts.u.derived->components->ts.u.derived;
6683 selector_type = code->expr1->ts.u.derived->components->ts.u.derived;
6685 /* Assume there is no DEFAULT case. */
6686 default_case = NULL;
6688 /* Loop over TYPE IS / CLASS IS cases. */
6689 for (body = code->block; body; body = body->block)
6691 c = body->ext.case_list;
6693 /* Check F03:C815. */
6694 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6695 && !gfc_type_is_extensible (c->ts.u.derived))
6697 gfc_error ("Derived type '%s' at %L must be extensible",
6698 c->ts.u.derived->name, &c->where);
6702 /* Check F03:C816. */
6703 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6704 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
6706 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
6707 c->ts.u.derived->name, &c->where, selector_type->name);
6711 /* Intercept the DEFAULT case. */
6712 if (c->ts.type == BT_UNKNOWN)
6714 /* Check F03:C818. */
6715 if (default_case != NULL)
6716 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6717 "by a second DEFAULT CASE at %L",
6718 &default_case->where, &c->where);
6727 /* Insert assignment for selector variable. */
6728 new_st = gfc_get_code ();
6729 new_st->op = EXEC_ASSIGN;
6730 new_st->expr1 = gfc_copy_expr (code->expr1);
6731 new_st->expr2 = gfc_copy_expr (code->expr2);
6735 /* Put SELECT TYPE statement inside a BLOCK. */
6736 new_st = gfc_get_code ();
6737 new_st->op = code->op;
6738 new_st->expr1 = code->expr1;
6739 new_st->expr2 = code->expr2;
6740 new_st->block = code->block;
6744 ns->code->next = new_st;
6745 code->op = EXEC_BLOCK;
6746 code->expr1 = code->expr2 = NULL;
6751 /* Transform to EXEC_SELECT. */
6752 code->op = EXEC_SELECT;
6753 gfc_add_component_ref (code->expr1, "$vindex");
6755 /* Loop over TYPE IS / CLASS IS cases. */
6756 for (body = code->block; body; body = body->block)
6758 c = body->ext.case_list;
6759 if (c->ts.type == BT_DERIVED)
6760 c->low = c->high = gfc_int_expr (c->ts.u.derived->vindex);
6761 else if (c->ts.type == BT_CLASS)
6762 /* Currently IS CLASS blocks are simply ignored.
6763 TODO: Implement IS CLASS. */
6766 if (c->ts.type != BT_DERIVED)
6768 /* Assign temporary to selector. */
6769 sprintf (name, "tmp$%s", c->ts.u.derived->name);
6770 st = gfc_find_symtree (ns->sym_root, name);
6771 new_st = gfc_get_code ();
6772 new_st->op = EXEC_POINTER_ASSIGN;
6773 new_st->expr1 = gfc_get_variable_expr (st);
6774 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
6775 gfc_add_component_ref (new_st->expr2, "$data");
6776 new_st->next = body->next;
6777 body->next = new_st;
6780 /* Eliminate dead blocks. */
6781 for (body = code; body && body->block; body = body->block)
6783 if (body->block->ext.case_list->unreachable)
6785 /* Cut the unreachable block from the code chain. */
6786 gfc_code *cd = body->block;
6787 body->block = cd->block;
6788 /* Kill the dead block, but not the blocks below it. */
6790 gfc_free_statements (cd);
6794 resolve_select (code);
6799 /* Resolve a transfer statement. This is making sure that:
6800 -- a derived type being transferred has only non-pointer components
6801 -- a derived type being transferred doesn't have private components, unless
6802 it's being transferred from the module where the type was defined
6803 -- we're not trying to transfer a whole assumed size array. */
6806 resolve_transfer (gfc_code *code)
6815 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
6818 sym = exp->symtree->n.sym;
6821 /* Go to actual component transferred. */
6822 for (ref = code->expr1->ref; ref; ref = ref->next)
6823 if (ref->type == REF_COMPONENT)
6824 ts = &ref->u.c.component->ts;
6826 if (ts->type == BT_DERIVED)
6828 /* Check that transferred derived type doesn't contain POINTER
6830 if (ts->u.derived->attr.pointer_comp)
6832 gfc_error ("Data transfer element at %L cannot have "
6833 "POINTER components", &code->loc);
6837 if (ts->u.derived->attr.alloc_comp)
6839 gfc_error ("Data transfer element at %L cannot have "
6840 "ALLOCATABLE components", &code->loc);
6844 if (derived_inaccessible (ts->u.derived))
6846 gfc_error ("Data transfer element at %L cannot have "
6847 "PRIVATE components",&code->loc);
6852 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
6853 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
6855 gfc_error ("Data transfer element at %L cannot be a full reference to "
6856 "an assumed-size array", &code->loc);
6862 /*********** Toplevel code resolution subroutines ***********/
6864 /* Find the set of labels that are reachable from this block. We also
6865 record the last statement in each block. */
6868 find_reachable_labels (gfc_code *block)
6875 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
6877 /* Collect labels in this block. We don't keep those corresponding
6878 to END {IF|SELECT}, these are checked in resolve_branch by going
6879 up through the code_stack. */
6880 for (c = block; c; c = c->next)
6882 if (c->here && c->op != EXEC_END_BLOCK)
6883 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
6886 /* Merge with labels from parent block. */
6889 gcc_assert (cs_base->prev->reachable_labels);
6890 bitmap_ior_into (cs_base->reachable_labels,
6891 cs_base->prev->reachable_labels);
6895 /* Given a branch to a label, see if the branch is conforming.
6896 The code node describes where the branch is located. */
6899 resolve_branch (gfc_st_label *label, gfc_code *code)
6906 /* Step one: is this a valid branching target? */
6908 if (label->defined == ST_LABEL_UNKNOWN)
6910 gfc_error ("Label %d referenced at %L is never defined", label->value,
6915 if (label->defined != ST_LABEL_TARGET)
6917 gfc_error ("Statement at %L is not a valid branch target statement "
6918 "for the branch statement at %L", &label->where, &code->loc);
6922 /* Step two: make sure this branch is not a branch to itself ;-) */
6924 if (code->here == label)
6926 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
6930 /* Step three: See if the label is in the same block as the
6931 branching statement. The hard work has been done by setting up
6932 the bitmap reachable_labels. */
6934 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
6937 /* Step four: If we haven't found the label in the bitmap, it may
6938 still be the label of the END of the enclosing block, in which
6939 case we find it by going up the code_stack. */
6941 for (stack = cs_base; stack; stack = stack->prev)
6942 if (stack->current->next && stack->current->next->here == label)
6947 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
6951 /* The label is not in an enclosing block, so illegal. This was
6952 allowed in Fortran 66, so we allow it as extension. No
6953 further checks are necessary in this case. */
6954 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
6955 "as the GOTO statement at %L", &label->where,
6961 /* Check whether EXPR1 has the same shape as EXPR2. */
6964 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
6966 mpz_t shape[GFC_MAX_DIMENSIONS];
6967 mpz_t shape2[GFC_MAX_DIMENSIONS];
6968 gfc_try result = FAILURE;
6971 /* Compare the rank. */
6972 if (expr1->rank != expr2->rank)
6975 /* Compare the size of each dimension. */
6976 for (i=0; i<expr1->rank; i++)
6978 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
6981 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
6984 if (mpz_cmp (shape[i], shape2[i]))
6988 /* When either of the two expression is an assumed size array, we
6989 ignore the comparison of dimension sizes. */
6994 for (i--; i >= 0; i--)
6996 mpz_clear (shape[i]);
6997 mpz_clear (shape2[i]);
7003 /* Check whether a WHERE assignment target or a WHERE mask expression
7004 has the same shape as the outmost WHERE mask expression. */
7007 resolve_where (gfc_code *code, gfc_expr *mask)
7013 cblock = code->block;
7015 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7016 In case of nested WHERE, only the outmost one is stored. */
7017 if (mask == NULL) /* outmost WHERE */
7019 else /* inner WHERE */
7026 /* Check if the mask-expr has a consistent shape with the
7027 outmost WHERE mask-expr. */
7028 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7029 gfc_error ("WHERE mask at %L has inconsistent shape",
7030 &cblock->expr1->where);
7033 /* the assignment statement of a WHERE statement, or the first
7034 statement in where-body-construct of a WHERE construct */
7035 cnext = cblock->next;
7040 /* WHERE assignment statement */
7043 /* Check shape consistent for WHERE assignment target. */
7044 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7045 gfc_error ("WHERE assignment target at %L has "
7046 "inconsistent shape", &cnext->expr1->where);
7050 case EXEC_ASSIGN_CALL:
7051 resolve_call (cnext);
7052 if (!cnext->resolved_sym->attr.elemental)
7053 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7054 &cnext->ext.actual->expr->where);
7057 /* WHERE or WHERE construct is part of a where-body-construct */
7059 resolve_where (cnext, e);
7063 gfc_error ("Unsupported statement inside WHERE at %L",
7066 /* the next statement within the same where-body-construct */
7067 cnext = cnext->next;
7069 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7070 cblock = cblock->block;
7075 /* Resolve assignment in FORALL construct.
7076 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7077 FORALL index variables. */
7080 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7084 for (n = 0; n < nvar; n++)
7086 gfc_symbol *forall_index;
7088 forall_index = var_expr[n]->symtree->n.sym;
7090 /* Check whether the assignment target is one of the FORALL index
7092 if ((code->expr1->expr_type == EXPR_VARIABLE)
7093 && (code->expr1->symtree->n.sym == forall_index))
7094 gfc_error ("Assignment to a FORALL index variable at %L",
7095 &code->expr1->where);
7098 /* If one of the FORALL index variables doesn't appear in the
7099 assignment variable, then there could be a many-to-one
7100 assignment. Emit a warning rather than an error because the
7101 mask could be resolving this problem. */
7102 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7103 gfc_warning ("The FORALL with index '%s' is not used on the "
7104 "left side of the assignment at %L and so might "
7105 "cause multiple assignment to this object",
7106 var_expr[n]->symtree->name, &code->expr1->where);
7112 /* Resolve WHERE statement in FORALL construct. */
7115 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7116 gfc_expr **var_expr)
7121 cblock = code->block;
7124 /* the assignment statement of a WHERE statement, or the first
7125 statement in where-body-construct of a WHERE construct */
7126 cnext = cblock->next;
7131 /* WHERE assignment statement */
7133 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7136 /* WHERE operator assignment statement */
7137 case EXEC_ASSIGN_CALL:
7138 resolve_call (cnext);
7139 if (!cnext->resolved_sym->attr.elemental)
7140 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7141 &cnext->ext.actual->expr->where);
7144 /* WHERE or WHERE construct is part of a where-body-construct */
7146 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7150 gfc_error ("Unsupported statement inside WHERE at %L",
7153 /* the next statement within the same where-body-construct */
7154 cnext = cnext->next;
7156 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7157 cblock = cblock->block;
7162 /* Traverse the FORALL body to check whether the following errors exist:
7163 1. For assignment, check if a many-to-one assignment happens.
7164 2. For WHERE statement, check the WHERE body to see if there is any
7165 many-to-one assignment. */
7168 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7172 c = code->block->next;
7178 case EXEC_POINTER_ASSIGN:
7179 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7182 case EXEC_ASSIGN_CALL:
7186 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7187 there is no need to handle it here. */
7191 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7196 /* The next statement in the FORALL body. */
7202 /* Counts the number of iterators needed inside a forall construct, including
7203 nested forall constructs. This is used to allocate the needed memory
7204 in gfc_resolve_forall. */
7207 gfc_count_forall_iterators (gfc_code *code)
7209 int max_iters, sub_iters, current_iters;
7210 gfc_forall_iterator *fa;
7212 gcc_assert(code->op == EXEC_FORALL);
7216 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7219 code = code->block->next;
7223 if (code->op == EXEC_FORALL)
7225 sub_iters = gfc_count_forall_iterators (code);
7226 if (sub_iters > max_iters)
7227 max_iters = sub_iters;
7232 return current_iters + max_iters;
7236 /* Given a FORALL construct, first resolve the FORALL iterator, then call
7237 gfc_resolve_forall_body to resolve the FORALL body. */
7240 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
7242 static gfc_expr **var_expr;
7243 static int total_var = 0;
7244 static int nvar = 0;
7246 gfc_forall_iterator *fa;
7251 /* Start to resolve a FORALL construct */
7252 if (forall_save == 0)
7254 /* Count the total number of FORALL index in the nested FORALL
7255 construct in order to allocate the VAR_EXPR with proper size. */
7256 total_var = gfc_count_forall_iterators (code);
7258 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
7259 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
7262 /* The information about FORALL iterator, including FORALL index start, end
7263 and stride. The FORALL index can not appear in start, end or stride. */
7264 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7266 /* Check if any outer FORALL index name is the same as the current
7268 for (i = 0; i < nvar; i++)
7270 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
7272 gfc_error ("An outer FORALL construct already has an index "
7273 "with this name %L", &fa->var->where);
7277 /* Record the current FORALL index. */
7278 var_expr[nvar] = gfc_copy_expr (fa->var);
7282 /* No memory leak. */
7283 gcc_assert (nvar <= total_var);
7286 /* Resolve the FORALL body. */
7287 gfc_resolve_forall_body (code, nvar, var_expr);
7289 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
7290 gfc_resolve_blocks (code->block, ns);
7294 /* Free only the VAR_EXPRs allocated in this frame. */
7295 for (i = nvar; i < tmp; i++)
7296 gfc_free_expr (var_expr[i]);
7300 /* We are in the outermost FORALL construct. */
7301 gcc_assert (forall_save == 0);
7303 /* VAR_EXPR is not needed any more. */
7304 gfc_free (var_expr);
7310 /* Resolve a BLOCK construct statement. */
7313 resolve_block_construct (gfc_code* code)
7315 /* Eventually, we may want to do some checks here or handle special stuff.
7316 But so far the only thing we can do is resolving the local namespace. */
7318 gfc_resolve (code->ext.ns);
7322 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
7325 static void resolve_code (gfc_code *, gfc_namespace *);
7328 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
7332 for (; b; b = b->block)
7334 t = gfc_resolve_expr (b->expr1);
7335 if (gfc_resolve_expr (b->expr2) == FAILURE)
7341 if (t == SUCCESS && b->expr1 != NULL
7342 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
7343 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7350 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
7351 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
7356 resolve_branch (b->label1, b);
7360 resolve_block_construct (b);
7364 case EXEC_SELECT_TYPE:
7374 case EXEC_OMP_ATOMIC:
7375 case EXEC_OMP_CRITICAL:
7377 case EXEC_OMP_MASTER:
7378 case EXEC_OMP_ORDERED:
7379 case EXEC_OMP_PARALLEL:
7380 case EXEC_OMP_PARALLEL_DO:
7381 case EXEC_OMP_PARALLEL_SECTIONS:
7382 case EXEC_OMP_PARALLEL_WORKSHARE:
7383 case EXEC_OMP_SECTIONS:
7384 case EXEC_OMP_SINGLE:
7386 case EXEC_OMP_TASKWAIT:
7387 case EXEC_OMP_WORKSHARE:
7391 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
7394 resolve_code (b->next, ns);
7399 /* Does everything to resolve an ordinary assignment. Returns true
7400 if this is an interface assignment. */
7402 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
7412 if (gfc_extend_assign (code, ns) == SUCCESS)
7414 gfc_symbol* assign_proc;
7417 if (code->op == EXEC_ASSIGN_CALL)
7419 lhs = code->ext.actual->expr;
7420 rhsptr = &code->ext.actual->next->expr;
7421 assign_proc = code->symtree->n.sym;
7425 gfc_actual_arglist* args;
7426 gfc_typebound_proc* tbp;
7428 gcc_assert (code->op == EXEC_COMPCALL);
7430 args = code->expr1->value.compcall.actual;
7432 rhsptr = &args->next->expr;
7434 tbp = code->expr1->value.compcall.tbp;
7435 gcc_assert (!tbp->is_generic);
7436 assign_proc = tbp->u.specific->n.sym;
7439 /* Make a temporary rhs when there is a default initializer
7440 and rhs is the same symbol as the lhs. */
7441 if ((*rhsptr)->expr_type == EXPR_VARIABLE
7442 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
7443 && has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
7444 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
7445 *rhsptr = gfc_get_parentheses (*rhsptr);
7454 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
7455 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
7456 &code->loc) == FAILURE)
7459 /* Handle the case of a BOZ literal on the RHS. */
7460 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
7463 if (gfc_option.warn_surprising)
7464 gfc_warning ("BOZ literal at %L is bitwise transferred "
7465 "non-integer symbol '%s'", &code->loc,
7466 lhs->symtree->n.sym->name);
7468 if (!gfc_convert_boz (rhs, &lhs->ts))
7470 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
7472 if (rc == ARITH_UNDERFLOW)
7473 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
7474 ". This check can be disabled with the option "
7475 "-fno-range-check", &rhs->where);
7476 else if (rc == ARITH_OVERFLOW)
7477 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
7478 ". This check can be disabled with the option "
7479 "-fno-range-check", &rhs->where);
7480 else if (rc == ARITH_NAN)
7481 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
7482 ". This check can be disabled with the option "
7483 "-fno-range-check", &rhs->where);
7489 if (lhs->ts.type == BT_CHARACTER
7490 && gfc_option.warn_character_truncation)
7492 if (lhs->ts.u.cl != NULL
7493 && lhs->ts.u.cl->length != NULL
7494 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7495 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
7497 if (rhs->expr_type == EXPR_CONSTANT)
7498 rlen = rhs->value.character.length;
7500 else if (rhs->ts.u.cl != NULL
7501 && rhs->ts.u.cl->length != NULL
7502 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7503 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
7505 if (rlen && llen && rlen > llen)
7506 gfc_warning_now ("CHARACTER expression will be truncated "
7507 "in assignment (%d/%d) at %L",
7508 llen, rlen, &code->loc);
7511 /* Ensure that a vector index expression for the lvalue is evaluated
7512 to a temporary if the lvalue symbol is referenced in it. */
7515 for (ref = lhs->ref; ref; ref= ref->next)
7516 if (ref->type == REF_ARRAY)
7518 for (n = 0; n < ref->u.ar.dimen; n++)
7519 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
7520 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
7521 ref->u.ar.start[n]))
7523 = gfc_get_parentheses (ref->u.ar.start[n]);
7527 if (gfc_pure (NULL))
7529 if (gfc_impure_variable (lhs->symtree->n.sym))
7531 gfc_error ("Cannot assign to variable '%s' in PURE "
7533 lhs->symtree->n.sym->name,
7538 if (lhs->ts.type == BT_DERIVED
7539 && lhs->expr_type == EXPR_VARIABLE
7540 && lhs->ts.u.derived->attr.pointer_comp
7541 && gfc_impure_variable (rhs->symtree->n.sym))
7543 gfc_error ("The impure variable at %L is assigned to "
7544 "a derived type variable with a POINTER "
7545 "component in a PURE procedure (12.6)",
7551 gfc_check_assign (lhs, rhs, 1);
7556 /* Check an assignment to a CLASS object (pointer or ordinary assignment). */
7559 resolve_class_assign (gfc_code *code)
7561 gfc_code *assign_code = gfc_get_code ();
7563 if (code->expr2->ts.type != BT_CLASS)
7565 /* Insert an additional assignment which sets the vindex. */
7566 assign_code->next = code->next;
7567 code->next = assign_code;
7568 assign_code->op = EXEC_ASSIGN;
7569 assign_code->expr1 = gfc_copy_expr (code->expr1);
7570 gfc_add_component_ref (assign_code->expr1, "$vindex");
7571 if (code->expr2->ts.type == BT_DERIVED)
7572 /* vindex is constant, determined at compile time. */
7573 assign_code->expr2 = gfc_int_expr (code->expr2->ts.u.derived->vindex);
7574 else if (code->expr2->ts.type == BT_CLASS)
7576 /* vindex must be determined at run time. */
7577 assign_code->expr2 = gfc_copy_expr (code->expr2);
7578 gfc_add_component_ref (assign_code->expr2, "$vindex");
7580 else if (code->expr2->expr_type == EXPR_NULL)
7581 assign_code->expr2 = gfc_int_expr (0);
7586 /* Modify the actual pointer assignment. */
7587 if (code->expr2->ts.type == BT_CLASS)
7588 code->op = EXEC_ASSIGN;
7590 gfc_add_component_ref (code->expr1, "$data");
7594 /* Given a block of code, recursively resolve everything pointed to by this
7598 resolve_code (gfc_code *code, gfc_namespace *ns)
7600 int omp_workshare_save;
7605 frame.prev = cs_base;
7609 find_reachable_labels (code);
7611 for (; code; code = code->next)
7613 frame.current = code;
7614 forall_save = forall_flag;
7616 if (code->op == EXEC_FORALL)
7619 gfc_resolve_forall (code, ns, forall_save);
7622 else if (code->block)
7624 omp_workshare_save = -1;
7627 case EXEC_OMP_PARALLEL_WORKSHARE:
7628 omp_workshare_save = omp_workshare_flag;
7629 omp_workshare_flag = 1;
7630 gfc_resolve_omp_parallel_blocks (code, ns);
7632 case EXEC_OMP_PARALLEL:
7633 case EXEC_OMP_PARALLEL_DO:
7634 case EXEC_OMP_PARALLEL_SECTIONS:
7636 omp_workshare_save = omp_workshare_flag;
7637 omp_workshare_flag = 0;
7638 gfc_resolve_omp_parallel_blocks (code, ns);
7641 gfc_resolve_omp_do_blocks (code, ns);
7643 case EXEC_OMP_WORKSHARE:
7644 omp_workshare_save = omp_workshare_flag;
7645 omp_workshare_flag = 1;
7648 gfc_resolve_blocks (code->block, ns);
7652 if (omp_workshare_save != -1)
7653 omp_workshare_flag = omp_workshare_save;
7657 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
7658 t = gfc_resolve_expr (code->expr1);
7659 forall_flag = forall_save;
7661 if (gfc_resolve_expr (code->expr2) == FAILURE)
7667 case EXEC_END_BLOCK:
7674 case EXEC_ASSIGN_CALL:
7678 /* Keep track of which entry we are up to. */
7679 current_entry_id = code->ext.entry->id;
7683 resolve_where (code, NULL);
7687 if (code->expr1 != NULL)
7689 if (code->expr1->ts.type != BT_INTEGER)
7690 gfc_error ("ASSIGNED GOTO statement at %L requires an "
7691 "INTEGER variable", &code->expr1->where);
7692 else if (code->expr1->symtree->n.sym->attr.assign != 1)
7693 gfc_error ("Variable '%s' has not been assigned a target "
7694 "label at %L", code->expr1->symtree->n.sym->name,
7695 &code->expr1->where);
7698 resolve_branch (code->label1, code);
7702 if (code->expr1 != NULL
7703 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
7704 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
7705 "INTEGER return specifier", &code->expr1->where);
7708 case EXEC_INIT_ASSIGN:
7709 case EXEC_END_PROCEDURE:
7716 if (resolve_ordinary_assign (code, ns))
7718 if (code->op == EXEC_COMPCALL)
7724 if (code->expr1->ts.type == BT_CLASS)
7725 resolve_class_assign (code);
7729 case EXEC_LABEL_ASSIGN:
7730 if (code->label1->defined == ST_LABEL_UNKNOWN)
7731 gfc_error ("Label %d referenced at %L is never defined",
7732 code->label1->value, &code->label1->where);
7734 && (code->expr1->expr_type != EXPR_VARIABLE
7735 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
7736 || code->expr1->symtree->n.sym->ts.kind
7737 != gfc_default_integer_kind
7738 || code->expr1->symtree->n.sym->as != NULL))
7739 gfc_error ("ASSIGN statement at %L requires a scalar "
7740 "default INTEGER variable", &code->expr1->where);
7743 case EXEC_POINTER_ASSIGN:
7747 gfc_check_pointer_assign (code->expr1, code->expr2);
7749 if (code->expr1->ts.type == BT_CLASS)
7750 resolve_class_assign (code);
7754 case EXEC_ARITHMETIC_IF:
7756 && code->expr1->ts.type != BT_INTEGER
7757 && code->expr1->ts.type != BT_REAL)
7758 gfc_error ("Arithmetic IF statement at %L requires a numeric "
7759 "expression", &code->expr1->where);
7761 resolve_branch (code->label1, code);
7762 resolve_branch (code->label2, code);
7763 resolve_branch (code->label3, code);
7767 if (t == SUCCESS && code->expr1 != NULL
7768 && (code->expr1->ts.type != BT_LOGICAL
7769 || code->expr1->rank != 0))
7770 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7771 &code->expr1->where);
7776 resolve_call (code);
7781 if (code->expr1->symtree
7782 && code->expr1->symtree->n.sym->ts.type == BT_CLASS)
7783 resolve_class_typebound_call (code);
7785 resolve_typebound_call (code);
7789 resolve_ppc_call (code);
7793 /* Select is complicated. Also, a SELECT construct could be
7794 a transformed computed GOTO. */
7795 resolve_select (code);
7798 case EXEC_SELECT_TYPE:
7799 resolve_select_type (code);
7803 gfc_resolve (code->ext.ns);
7807 if (code->ext.iterator != NULL)
7809 gfc_iterator *iter = code->ext.iterator;
7810 if (gfc_resolve_iterator (iter, true) != FAILURE)
7811 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
7816 if (code->expr1 == NULL)
7817 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
7819 && (code->expr1->rank != 0
7820 || code->expr1->ts.type != BT_LOGICAL))
7821 gfc_error ("Exit condition of DO WHILE loop at %L must be "
7822 "a scalar LOGICAL expression", &code->expr1->where);
7827 resolve_allocate_deallocate (code, "ALLOCATE");
7831 case EXEC_DEALLOCATE:
7833 resolve_allocate_deallocate (code, "DEALLOCATE");
7838 if (gfc_resolve_open (code->ext.open) == FAILURE)
7841 resolve_branch (code->ext.open->err, code);
7845 if (gfc_resolve_close (code->ext.close) == FAILURE)
7848 resolve_branch (code->ext.close->err, code);
7851 case EXEC_BACKSPACE:
7855 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
7858 resolve_branch (code->ext.filepos->err, code);
7862 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7865 resolve_branch (code->ext.inquire->err, code);
7869 gcc_assert (code->ext.inquire != NULL);
7870 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7873 resolve_branch (code->ext.inquire->err, code);
7877 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
7880 resolve_branch (code->ext.wait->err, code);
7881 resolve_branch (code->ext.wait->end, code);
7882 resolve_branch (code->ext.wait->eor, code);
7887 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
7890 resolve_branch (code->ext.dt->err, code);
7891 resolve_branch (code->ext.dt->end, code);
7892 resolve_branch (code->ext.dt->eor, code);
7896 resolve_transfer (code);
7900 resolve_forall_iterators (code->ext.forall_iterator);
7902 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
7903 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
7904 "expression", &code->expr1->where);
7907 case EXEC_OMP_ATOMIC:
7908 case EXEC_OMP_BARRIER:
7909 case EXEC_OMP_CRITICAL:
7910 case EXEC_OMP_FLUSH:
7912 case EXEC_OMP_MASTER:
7913 case EXEC_OMP_ORDERED:
7914 case EXEC_OMP_SECTIONS:
7915 case EXEC_OMP_SINGLE:
7916 case EXEC_OMP_TASKWAIT:
7917 case EXEC_OMP_WORKSHARE:
7918 gfc_resolve_omp_directive (code, ns);
7921 case EXEC_OMP_PARALLEL:
7922 case EXEC_OMP_PARALLEL_DO:
7923 case EXEC_OMP_PARALLEL_SECTIONS:
7924 case EXEC_OMP_PARALLEL_WORKSHARE:
7926 omp_workshare_save = omp_workshare_flag;
7927 omp_workshare_flag = 0;
7928 gfc_resolve_omp_directive (code, ns);
7929 omp_workshare_flag = omp_workshare_save;
7933 gfc_internal_error ("resolve_code(): Bad statement code");
7937 cs_base = frame.prev;
7941 /* Resolve initial values and make sure they are compatible with
7945 resolve_values (gfc_symbol *sym)
7947 if (sym->value == NULL)
7950 if (gfc_resolve_expr (sym->value) == FAILURE)
7953 gfc_check_assign_symbol (sym, sym->value);
7957 /* Verify the binding labels for common blocks that are BIND(C). The label
7958 for a BIND(C) common block must be identical in all scoping units in which
7959 the common block is declared. Further, the binding label can not collide
7960 with any other global entity in the program. */
7963 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
7965 if (comm_block_tree->n.common->is_bind_c == 1)
7967 gfc_gsymbol *binding_label_gsym;
7968 gfc_gsymbol *comm_name_gsym;
7970 /* See if a global symbol exists by the common block's name. It may
7971 be NULL if the common block is use-associated. */
7972 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
7973 comm_block_tree->n.common->name);
7974 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
7975 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
7976 "with the global entity '%s' at %L",
7977 comm_block_tree->n.common->binding_label,
7978 comm_block_tree->n.common->name,
7979 &(comm_block_tree->n.common->where),
7980 comm_name_gsym->name, &(comm_name_gsym->where));
7981 else if (comm_name_gsym != NULL
7982 && strcmp (comm_name_gsym->name,
7983 comm_block_tree->n.common->name) == 0)
7985 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
7987 if (comm_name_gsym->binding_label == NULL)
7988 /* No binding label for common block stored yet; save this one. */
7989 comm_name_gsym->binding_label =
7990 comm_block_tree->n.common->binding_label;
7992 if (strcmp (comm_name_gsym->binding_label,
7993 comm_block_tree->n.common->binding_label) != 0)
7995 /* Common block names match but binding labels do not. */
7996 gfc_error ("Binding label '%s' for common block '%s' at %L "
7997 "does not match the binding label '%s' for common "
7999 comm_block_tree->n.common->binding_label,
8000 comm_block_tree->n.common->name,
8001 &(comm_block_tree->n.common->where),
8002 comm_name_gsym->binding_label,
8003 comm_name_gsym->name,
8004 &(comm_name_gsym->where));
8009 /* There is no binding label (NAME="") so we have nothing further to
8010 check and nothing to add as a global symbol for the label. */
8011 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8014 binding_label_gsym =
8015 gfc_find_gsymbol (gfc_gsym_root,
8016 comm_block_tree->n.common->binding_label);
8017 if (binding_label_gsym == NULL)
8019 /* Need to make a global symbol for the binding label to prevent
8020 it from colliding with another. */
8021 binding_label_gsym =
8022 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8023 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8024 binding_label_gsym->type = GSYM_COMMON;
8028 /* If comm_name_gsym is NULL, the name common block is use
8029 associated and the name could be colliding. */
8030 if (binding_label_gsym->type != GSYM_COMMON)
8031 gfc_error ("Binding label '%s' for common block '%s' at %L "
8032 "collides with the global entity '%s' at %L",
8033 comm_block_tree->n.common->binding_label,
8034 comm_block_tree->n.common->name,
8035 &(comm_block_tree->n.common->where),
8036 binding_label_gsym->name,
8037 &(binding_label_gsym->where));
8038 else if (comm_name_gsym != NULL
8039 && (strcmp (binding_label_gsym->name,
8040 comm_name_gsym->binding_label) != 0)
8041 && (strcmp (binding_label_gsym->sym_name,
8042 comm_name_gsym->name) != 0))
8043 gfc_error ("Binding label '%s' for common block '%s' at %L "
8044 "collides with global entity '%s' at %L",
8045 binding_label_gsym->name, binding_label_gsym->sym_name,
8046 &(comm_block_tree->n.common->where),
8047 comm_name_gsym->name, &(comm_name_gsym->where));
8055 /* Verify any BIND(C) derived types in the namespace so we can report errors
8056 for them once, rather than for each variable declared of that type. */
8059 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8061 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8062 && derived_sym->attr.is_bind_c == 1)
8063 verify_bind_c_derived_type (derived_sym);
8069 /* Verify that any binding labels used in a given namespace do not collide
8070 with the names or binding labels of any global symbols. */
8073 gfc_verify_binding_labels (gfc_symbol *sym)
8077 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8078 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8080 gfc_gsymbol *bind_c_sym;
8082 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8083 if (bind_c_sym != NULL
8084 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8086 if (sym->attr.if_source == IFSRC_DECL
8087 && (bind_c_sym->type != GSYM_SUBROUTINE
8088 && bind_c_sym->type != GSYM_FUNCTION)
8089 && ((sym->attr.contained == 1
8090 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8091 || (sym->attr.use_assoc == 1
8092 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8094 /* Make sure global procedures don't collide with anything. */
8095 gfc_error ("Binding label '%s' at %L collides with the global "
8096 "entity '%s' at %L", sym->binding_label,
8097 &(sym->declared_at), bind_c_sym->name,
8098 &(bind_c_sym->where));
8101 else if (sym->attr.contained == 0
8102 && (sym->attr.if_source == IFSRC_IFBODY
8103 && sym->attr.flavor == FL_PROCEDURE)
8104 && (bind_c_sym->sym_name != NULL
8105 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8107 /* Make sure procedures in interface bodies don't collide. */
8108 gfc_error ("Binding label '%s' in interface body at %L collides "
8109 "with the global entity '%s' at %L",
8111 &(sym->declared_at), bind_c_sym->name,
8112 &(bind_c_sym->where));
8115 else if (sym->attr.contained == 0
8116 && sym->attr.if_source == IFSRC_UNKNOWN)
8117 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8118 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8119 || sym->attr.use_assoc == 0)
8121 gfc_error ("Binding label '%s' at %L collides with global "
8122 "entity '%s' at %L", sym->binding_label,
8123 &(sym->declared_at), bind_c_sym->name,
8124 &(bind_c_sym->where));
8129 /* Clear the binding label to prevent checking multiple times. */
8130 sym->binding_label[0] = '\0';
8132 else if (bind_c_sym == NULL)
8134 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8135 bind_c_sym->where = sym->declared_at;
8136 bind_c_sym->sym_name = sym->name;
8138 if (sym->attr.use_assoc == 1)
8139 bind_c_sym->mod_name = sym->module;
8141 if (sym->ns->proc_name != NULL)
8142 bind_c_sym->mod_name = sym->ns->proc_name->name;
8144 if (sym->attr.contained == 0)
8146 if (sym->attr.subroutine)
8147 bind_c_sym->type = GSYM_SUBROUTINE;
8148 else if (sym->attr.function)
8149 bind_c_sym->type = GSYM_FUNCTION;
8157 /* Resolve an index expression. */
8160 resolve_index_expr (gfc_expr *e)
8162 if (gfc_resolve_expr (e) == FAILURE)
8165 if (gfc_simplify_expr (e, 0) == FAILURE)
8168 if (gfc_specification_expr (e) == FAILURE)
8174 /* Resolve a charlen structure. */
8177 resolve_charlen (gfc_charlen *cl)
8186 specification_expr = 1;
8188 if (resolve_index_expr (cl->length) == FAILURE)
8190 specification_expr = 0;
8194 /* "If the character length parameter value evaluates to a negative
8195 value, the length of character entities declared is zero." */
8196 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8198 gfc_warning_now ("CHARACTER variable has zero length at %L",
8199 &cl->length->where);
8200 gfc_replace_expr (cl->length, gfc_int_expr (0));
8203 /* Check that the character length is not too large. */
8204 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8205 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8206 && cl->length->ts.type == BT_INTEGER
8207 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8209 gfc_error ("String length at %L is too large", &cl->length->where);
8217 /* Test for non-constant shape arrays. */
8220 is_non_constant_shape_array (gfc_symbol *sym)
8226 not_constant = false;
8227 if (sym->as != NULL)
8229 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
8230 has not been simplified; parameter array references. Do the
8231 simplification now. */
8232 for (i = 0; i < sym->as->rank; i++)
8234 e = sym->as->lower[i];
8235 if (e && (resolve_index_expr (e) == FAILURE
8236 || !gfc_is_constant_expr (e)))
8237 not_constant = true;
8239 e = sym->as->upper[i];
8240 if (e && (resolve_index_expr (e) == FAILURE
8241 || !gfc_is_constant_expr (e)))
8242 not_constant = true;
8245 return not_constant;
8248 /* Given a symbol and an initialization expression, add code to initialize
8249 the symbol to the function entry. */
8251 build_init_assign (gfc_symbol *sym, gfc_expr *init)
8255 gfc_namespace *ns = sym->ns;
8257 /* Search for the function namespace if this is a contained
8258 function without an explicit result. */
8259 if (sym->attr.function && sym == sym->result
8260 && sym->name != sym->ns->proc_name->name)
8263 for (;ns; ns = ns->sibling)
8264 if (strcmp (ns->proc_name->name, sym->name) == 0)
8270 gfc_free_expr (init);
8274 /* Build an l-value expression for the result. */
8275 lval = gfc_lval_expr_from_sym (sym);
8277 /* Add the code at scope entry. */
8278 init_st = gfc_get_code ();
8279 init_st->next = ns->code;
8282 /* Assign the default initializer to the l-value. */
8283 init_st->loc = sym->declared_at;
8284 init_st->op = EXEC_INIT_ASSIGN;
8285 init_st->expr1 = lval;
8286 init_st->expr2 = init;
8289 /* Assign the default initializer to a derived type variable or result. */
8292 apply_default_init (gfc_symbol *sym)
8294 gfc_expr *init = NULL;
8296 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8299 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
8300 init = gfc_default_initializer (&sym->ts);
8305 build_init_assign (sym, init);
8308 /* Build an initializer for a local integer, real, complex, logical, or
8309 character variable, based on the command line flags finit-local-zero,
8310 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
8311 null if the symbol should not have a default initialization. */
8313 build_default_init_expr (gfc_symbol *sym)
8316 gfc_expr *init_expr;
8319 /* These symbols should never have a default initialization. */
8320 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
8321 || sym->attr.external
8323 || sym->attr.pointer
8324 || sym->attr.in_equivalence
8325 || sym->attr.in_common
8328 || sym->attr.cray_pointee
8329 || sym->attr.cray_pointer)
8332 /* Now we'll try to build an initializer expression. */
8333 init_expr = gfc_get_expr ();
8334 init_expr->expr_type = EXPR_CONSTANT;
8335 init_expr->ts.type = sym->ts.type;
8336 init_expr->ts.kind = sym->ts.kind;
8337 init_expr->where = sym->declared_at;
8339 /* We will only initialize integers, reals, complex, logicals, and
8340 characters, and only if the corresponding command-line flags
8341 were set. Otherwise, we free init_expr and return null. */
8342 switch (sym->ts.type)
8345 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
8346 mpz_init_set_si (init_expr->value.integer,
8347 gfc_option.flag_init_integer_value);
8350 gfc_free_expr (init_expr);
8356 mpfr_init (init_expr->value.real);
8357 switch (gfc_option.flag_init_real)
8359 case GFC_INIT_REAL_SNAN:
8360 init_expr->is_snan = 1;
8362 case GFC_INIT_REAL_NAN:
8363 mpfr_set_nan (init_expr->value.real);
8366 case GFC_INIT_REAL_INF:
8367 mpfr_set_inf (init_expr->value.real, 1);
8370 case GFC_INIT_REAL_NEG_INF:
8371 mpfr_set_inf (init_expr->value.real, -1);
8374 case GFC_INIT_REAL_ZERO:
8375 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
8379 gfc_free_expr (init_expr);
8387 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
8389 mpfr_init (init_expr->value.complex.r);
8390 mpfr_init (init_expr->value.complex.i);
8392 switch (gfc_option.flag_init_real)
8394 case GFC_INIT_REAL_SNAN:
8395 init_expr->is_snan = 1;
8397 case GFC_INIT_REAL_NAN:
8398 mpfr_set_nan (mpc_realref (init_expr->value.complex));
8399 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
8402 case GFC_INIT_REAL_INF:
8403 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
8404 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
8407 case GFC_INIT_REAL_NEG_INF:
8408 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
8409 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
8412 case GFC_INIT_REAL_ZERO:
8414 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
8416 mpfr_set_ui (init_expr->value.complex.r, 0.0, GFC_RND_MODE);
8417 mpfr_set_ui (init_expr->value.complex.i, 0.0, GFC_RND_MODE);
8422 gfc_free_expr (init_expr);
8429 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
8430 init_expr->value.logical = 0;
8431 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
8432 init_expr->value.logical = 1;
8435 gfc_free_expr (init_expr);
8441 /* For characters, the length must be constant in order to
8442 create a default initializer. */
8443 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
8444 && sym->ts.u.cl->length
8445 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8447 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
8448 init_expr->value.character.length = char_len;
8449 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
8450 for (i = 0; i < char_len; i++)
8451 init_expr->value.character.string[i]
8452 = (unsigned char) gfc_option.flag_init_character_value;
8456 gfc_free_expr (init_expr);
8462 gfc_free_expr (init_expr);
8468 /* Add an initialization expression to a local variable. */
8470 apply_default_init_local (gfc_symbol *sym)
8472 gfc_expr *init = NULL;
8474 /* The symbol should be a variable or a function return value. */
8475 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8476 || (sym->attr.function && sym->result != sym))
8479 /* Try to build the initializer expression. If we can't initialize
8480 this symbol, then init will be NULL. */
8481 init = build_default_init_expr (sym);
8485 /* For saved variables, we don't want to add an initializer at
8486 function entry, so we just add a static initializer. */
8487 if (sym->attr.save || sym->ns->save_all)
8489 /* Don't clobber an existing initializer! */
8490 gcc_assert (sym->value == NULL);
8495 build_init_assign (sym, init);
8498 /* Resolution of common features of flavors variable and procedure. */
8501 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
8503 /* Constraints on deferred shape variable. */
8504 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
8506 if (sym->attr.allocatable)
8508 if (sym->attr.dimension)
8510 gfc_error ("Allocatable array '%s' at %L must have "
8511 "a deferred shape", sym->name, &sym->declared_at);
8514 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
8515 "may not be ALLOCATABLE", sym->name,
8516 &sym->declared_at) == FAILURE)
8520 if (sym->attr.pointer && sym->attr.dimension)
8522 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
8523 sym->name, &sym->declared_at);
8530 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
8531 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
8533 gfc_error ("Array '%s' at %L cannot have a deferred shape",
8534 sym->name, &sym->declared_at);
8542 /* Additional checks for symbols with flavor variable and derived
8543 type. To be called from resolve_fl_variable. */
8546 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
8548 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
8550 /* Check to see if a derived type is blocked from being host
8551 associated by the presence of another class I symbol in the same
8552 namespace. 14.6.1.3 of the standard and the discussion on
8553 comp.lang.fortran. */
8554 if (sym->ns != sym->ts.u.derived->ns
8555 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
8558 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
8559 if (s && s->attr.flavor != FL_DERIVED)
8561 gfc_error ("The type '%s' cannot be host associated at %L "
8562 "because it is blocked by an incompatible object "
8563 "of the same name declared at %L",
8564 sym->ts.u.derived->name, &sym->declared_at,
8570 /* 4th constraint in section 11.3: "If an object of a type for which
8571 component-initialization is specified (R429) appears in the
8572 specification-part of a module and does not have the ALLOCATABLE
8573 or POINTER attribute, the object shall have the SAVE attribute."
8575 The check for initializers is performed with
8576 has_default_initializer because gfc_default_initializer generates
8577 a hidden default for allocatable components. */
8578 if (!(sym->value || no_init_flag) && sym->ns->proc_name
8579 && sym->ns->proc_name->attr.flavor == FL_MODULE
8580 && !sym->ns->save_all && !sym->attr.save
8581 && !sym->attr.pointer && !sym->attr.allocatable
8582 && has_default_initializer (sym->ts.u.derived))
8584 gfc_error("Object '%s' at %L must have the SAVE attribute for "
8585 "default initialization of a component",
8586 sym->name, &sym->declared_at);
8590 if (sym->ts.type == BT_CLASS)
8593 if (!gfc_type_is_extensible (sym->ts.u.derived->components->ts.u.derived))
8595 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
8596 sym->ts.u.derived->name, sym->name, &sym->declared_at);
8601 if (!(sym->attr.dummy || sym->attr.allocatable || sym->attr.pointer
8602 || sym->ts.u.derived->components->attr.allocatable
8603 || sym->ts.u.derived->components->attr.pointer))
8605 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
8606 "or pointer", sym->name, &sym->declared_at);
8611 /* Assign default initializer. */
8612 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
8613 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
8615 sym->value = gfc_default_initializer (&sym->ts);
8622 /* Resolve symbols with flavor variable. */
8625 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
8627 int no_init_flag, automatic_flag;
8629 const char *auto_save_msg;
8631 auto_save_msg = "Automatic object '%s' at %L cannot have the "
8634 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8637 /* Set this flag to check that variables are parameters of all entries.
8638 This check is effected by the call to gfc_resolve_expr through
8639 is_non_constant_shape_array. */
8640 specification_expr = 1;
8642 if (sym->ns->proc_name
8643 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8644 || sym->ns->proc_name->attr.is_main_program)
8645 && !sym->attr.use_assoc
8646 && !sym->attr.allocatable
8647 && !sym->attr.pointer
8648 && is_non_constant_shape_array (sym))
8650 /* The shape of a main program or module array needs to be
8652 gfc_error ("The module or main program array '%s' at %L must "
8653 "have constant shape", sym->name, &sym->declared_at);
8654 specification_expr = 0;
8658 if (sym->ts.type == BT_CHARACTER)
8660 /* Make sure that character string variables with assumed length are
8662 e = sym->ts.u.cl->length;
8663 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
8665 gfc_error ("Entity with assumed character length at %L must be a "
8666 "dummy argument or a PARAMETER", &sym->declared_at);
8670 if (e && sym->attr.save && !gfc_is_constant_expr (e))
8672 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8676 if (!gfc_is_constant_expr (e)
8677 && !(e->expr_type == EXPR_VARIABLE
8678 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
8679 && sym->ns->proc_name
8680 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8681 || sym->ns->proc_name->attr.is_main_program)
8682 && !sym->attr.use_assoc)
8684 gfc_error ("'%s' at %L must have constant character length "
8685 "in this context", sym->name, &sym->declared_at);
8690 if (sym->value == NULL && sym->attr.referenced)
8691 apply_default_init_local (sym); /* Try to apply a default initialization. */
8693 /* Determine if the symbol may not have an initializer. */
8694 no_init_flag = automatic_flag = 0;
8695 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
8696 || sym->attr.intrinsic || sym->attr.result)
8698 else if (sym->attr.dimension && !sym->attr.pointer
8699 && is_non_constant_shape_array (sym))
8701 no_init_flag = automatic_flag = 1;
8703 /* Also, they must not have the SAVE attribute.
8704 SAVE_IMPLICIT is checked below. */
8705 if (sym->attr.save == SAVE_EXPLICIT)
8707 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8712 /* Ensure that any initializer is simplified. */
8714 gfc_simplify_expr (sym->value, 1);
8716 /* Reject illegal initializers. */
8717 if (!sym->mark && sym->value)
8719 if (sym->attr.allocatable)
8720 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
8721 sym->name, &sym->declared_at);
8722 else if (sym->attr.external)
8723 gfc_error ("External '%s' at %L cannot have an initializer",
8724 sym->name, &sym->declared_at);
8725 else if (sym->attr.dummy
8726 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
8727 gfc_error ("Dummy '%s' at %L cannot have an initializer",
8728 sym->name, &sym->declared_at);
8729 else if (sym->attr.intrinsic)
8730 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
8731 sym->name, &sym->declared_at);
8732 else if (sym->attr.result)
8733 gfc_error ("Function result '%s' at %L cannot have an initializer",
8734 sym->name, &sym->declared_at);
8735 else if (automatic_flag)
8736 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
8737 sym->name, &sym->declared_at);
8744 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
8745 return resolve_fl_variable_derived (sym, no_init_flag);
8751 /* Resolve a procedure. */
8754 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
8756 gfc_formal_arglist *arg;
8758 if (sym->attr.ambiguous_interfaces && !sym->attr.referenced)
8759 gfc_warning ("Although not referenced, '%s' at %L has ambiguous "
8760 "interfaces", sym->name, &sym->declared_at);
8762 if (sym->attr.function
8763 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8766 if (sym->ts.type == BT_CHARACTER)
8768 gfc_charlen *cl = sym->ts.u.cl;
8770 if (cl && cl->length && gfc_is_constant_expr (cl->length)
8771 && resolve_charlen (cl) == FAILURE)
8774 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
8776 if (sym->attr.proc == PROC_ST_FUNCTION)
8778 gfc_error ("Character-valued statement function '%s' at %L must "
8779 "have constant length", sym->name, &sym->declared_at);
8783 if (sym->attr.external && sym->formal == NULL
8784 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
8786 gfc_error ("Automatic character length function '%s' at %L must "
8787 "have an explicit interface", sym->name,
8794 /* Ensure that derived type for are not of a private type. Internal
8795 module procedures are excluded by 2.2.3.3 - i.e., they are not
8796 externally accessible and can access all the objects accessible in
8798 if (!(sym->ns->parent
8799 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
8800 && gfc_check_access(sym->attr.access, sym->ns->default_access))
8802 gfc_interface *iface;
8804 for (arg = sym->formal; arg; arg = arg->next)
8807 && arg->sym->ts.type == BT_DERIVED
8808 && !arg->sym->ts.u.derived->attr.use_assoc
8809 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
8810 arg->sym->ts.u.derived->ns->default_access)
8811 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
8812 "PRIVATE type and cannot be a dummy argument"
8813 " of '%s', which is PUBLIC at %L",
8814 arg->sym->name, sym->name, &sym->declared_at)
8817 /* Stop this message from recurring. */
8818 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
8823 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8824 PRIVATE to the containing module. */
8825 for (iface = sym->generic; iface; iface = iface->next)
8827 for (arg = iface->sym->formal; arg; arg = arg->next)
8830 && arg->sym->ts.type == BT_DERIVED
8831 && !arg->sym->ts.u.derived->attr.use_assoc
8832 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
8833 arg->sym->ts.u.derived->ns->default_access)
8834 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8835 "'%s' in PUBLIC interface '%s' at %L "
8836 "takes dummy arguments of '%s' which is "
8837 "PRIVATE", iface->sym->name, sym->name,
8838 &iface->sym->declared_at,
8839 gfc_typename (&arg->sym->ts)) == FAILURE)
8841 /* Stop this message from recurring. */
8842 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
8848 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8849 PRIVATE to the containing module. */
8850 for (iface = sym->generic; iface; iface = iface->next)
8852 for (arg = iface->sym->formal; arg; arg = arg->next)
8855 && arg->sym->ts.type == BT_DERIVED
8856 && !arg->sym->ts.u.derived->attr.use_assoc
8857 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
8858 arg->sym->ts.u.derived->ns->default_access)
8859 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8860 "'%s' in PUBLIC interface '%s' at %L "
8861 "takes dummy arguments of '%s' which is "
8862 "PRIVATE", iface->sym->name, sym->name,
8863 &iface->sym->declared_at,
8864 gfc_typename (&arg->sym->ts)) == FAILURE)
8866 /* Stop this message from recurring. */
8867 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
8874 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
8875 && !sym->attr.proc_pointer)
8877 gfc_error ("Function '%s' at %L cannot have an initializer",
8878 sym->name, &sym->declared_at);
8882 /* An external symbol may not have an initializer because it is taken to be
8883 a procedure. Exception: Procedure Pointers. */
8884 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
8886 gfc_error ("External object '%s' at %L may not have an initializer",
8887 sym->name, &sym->declared_at);
8891 /* An elemental function is required to return a scalar 12.7.1 */
8892 if (sym->attr.elemental && sym->attr.function && sym->as)
8894 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
8895 "result", sym->name, &sym->declared_at);
8896 /* Reset so that the error only occurs once. */
8897 sym->attr.elemental = 0;
8901 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
8902 char-len-param shall not be array-valued, pointer-valued, recursive
8903 or pure. ....snip... A character value of * may only be used in the
8904 following ways: (i) Dummy arg of procedure - dummy associates with
8905 actual length; (ii) To declare a named constant; or (iii) External
8906 function - but length must be declared in calling scoping unit. */
8907 if (sym->attr.function
8908 && sym->ts.type == BT_CHARACTER
8909 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
8911 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
8912 || (sym->attr.recursive) || (sym->attr.pure))
8914 if (sym->as && sym->as->rank)
8915 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8916 "array-valued", sym->name, &sym->declared_at);
8918 if (sym->attr.pointer)
8919 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8920 "pointer-valued", sym->name, &sym->declared_at);
8923 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8924 "pure", sym->name, &sym->declared_at);
8926 if (sym->attr.recursive)
8927 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8928 "recursive", sym->name, &sym->declared_at);
8933 /* Appendix B.2 of the standard. Contained functions give an
8934 error anyway. Fixed-form is likely to be F77/legacy. */
8935 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
8936 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
8937 "CHARACTER(*) function '%s' at %L",
8938 sym->name, &sym->declared_at);
8941 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
8943 gfc_formal_arglist *curr_arg;
8944 int has_non_interop_arg = 0;
8946 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
8947 sym->common_block) == FAILURE)
8949 /* Clear these to prevent looking at them again if there was an
8951 sym->attr.is_bind_c = 0;
8952 sym->attr.is_c_interop = 0;
8953 sym->ts.is_c_interop = 0;
8957 /* So far, no errors have been found. */
8958 sym->attr.is_c_interop = 1;
8959 sym->ts.is_c_interop = 1;
8962 curr_arg = sym->formal;
8963 while (curr_arg != NULL)
8965 /* Skip implicitly typed dummy args here. */
8966 if (curr_arg->sym->attr.implicit_type == 0)
8967 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
8968 /* If something is found to fail, record the fact so we
8969 can mark the symbol for the procedure as not being
8970 BIND(C) to try and prevent multiple errors being
8972 has_non_interop_arg = 1;
8974 curr_arg = curr_arg->next;
8977 /* See if any of the arguments were not interoperable and if so, clear
8978 the procedure symbol to prevent duplicate error messages. */
8979 if (has_non_interop_arg != 0)
8981 sym->attr.is_c_interop = 0;
8982 sym->ts.is_c_interop = 0;
8983 sym->attr.is_bind_c = 0;
8987 if (!sym->attr.proc_pointer)
8989 if (sym->attr.save == SAVE_EXPLICIT)
8991 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
8992 "in '%s' at %L", sym->name, &sym->declared_at);
8995 if (sym->attr.intent)
8997 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
8998 "in '%s' at %L", sym->name, &sym->declared_at);
9001 if (sym->attr.subroutine && sym->attr.result)
9003 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9004 "in '%s' at %L", sym->name, &sym->declared_at);
9007 if (sym->attr.external && sym->attr.function
9008 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9009 || sym->attr.contained))
9011 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9012 "in '%s' at %L", sym->name, &sym->declared_at);
9015 if (strcmp ("ppr@", sym->name) == 0)
9017 gfc_error ("Procedure pointer result '%s' at %L "
9018 "is missing the pointer attribute",
9019 sym->ns->proc_name->name, &sym->declared_at);
9028 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9029 been defined and we now know their defined arguments, check that they fulfill
9030 the requirements of the standard for procedures used as finalizers. */
9033 gfc_resolve_finalizers (gfc_symbol* derived)
9035 gfc_finalizer* list;
9036 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9037 gfc_try result = SUCCESS;
9038 bool seen_scalar = false;
9040 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9043 /* Walk over the list of finalizer-procedures, check them, and if any one
9044 does not fit in with the standard's definition, print an error and remove
9045 it from the list. */
9046 prev_link = &derived->f2k_derived->finalizers;
9047 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9053 /* Skip this finalizer if we already resolved it. */
9054 if (list->proc_tree)
9056 prev_link = &(list->next);
9060 /* Check this exists and is a SUBROUTINE. */
9061 if (!list->proc_sym->attr.subroutine)
9063 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9064 list->proc_sym->name, &list->where);
9068 /* We should have exactly one argument. */
9069 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9071 gfc_error ("FINAL procedure at %L must have exactly one argument",
9075 arg = list->proc_sym->formal->sym;
9077 /* This argument must be of our type. */
9078 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9080 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9081 &arg->declared_at, derived->name);
9085 /* It must neither be a pointer nor allocatable nor optional. */
9086 if (arg->attr.pointer)
9088 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9092 if (arg->attr.allocatable)
9094 gfc_error ("Argument of FINAL procedure at %L must not be"
9095 " ALLOCATABLE", &arg->declared_at);
9098 if (arg->attr.optional)
9100 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9105 /* It must not be INTENT(OUT). */
9106 if (arg->attr.intent == INTENT_OUT)
9108 gfc_error ("Argument of FINAL procedure at %L must not be"
9109 " INTENT(OUT)", &arg->declared_at);
9113 /* Warn if the procedure is non-scalar and not assumed shape. */
9114 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9115 && arg->as->type != AS_ASSUMED_SHAPE)
9116 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9117 " shape argument", &arg->declared_at);
9119 /* Check that it does not match in kind and rank with a FINAL procedure
9120 defined earlier. To really loop over the *earlier* declarations,
9121 we need to walk the tail of the list as new ones were pushed at the
9123 /* TODO: Handle kind parameters once they are implemented. */
9124 my_rank = (arg->as ? arg->as->rank : 0);
9125 for (i = list->next; i; i = i->next)
9127 /* Argument list might be empty; that is an error signalled earlier,
9128 but we nevertheless continued resolving. */
9129 if (i->proc_sym->formal)
9131 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9132 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9133 if (i_rank == my_rank)
9135 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9136 " rank (%d) as '%s'",
9137 list->proc_sym->name, &list->where, my_rank,
9144 /* Is this the/a scalar finalizer procedure? */
9145 if (!arg->as || arg->as->rank == 0)
9148 /* Find the symtree for this procedure. */
9149 gcc_assert (!list->proc_tree);
9150 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9152 prev_link = &list->next;
9155 /* Remove wrong nodes immediately from the list so we don't risk any
9156 troubles in the future when they might fail later expectations. */
9160 *prev_link = list->next;
9161 gfc_free_finalizer (i);
9164 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9165 were nodes in the list, must have been for arrays. It is surely a good
9166 idea to have a scalar version there if there's something to finalize. */
9167 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9168 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9169 " defined at %L, suggest also scalar one",
9170 derived->name, &derived->declared_at);
9172 /* TODO: Remove this error when finalization is finished. */
9173 gfc_error ("Finalization at %L is not yet implemented",
9174 &derived->declared_at);
9180 /* Check that it is ok for the typebound procedure proc to override the
9184 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9187 const gfc_symbol* proc_target;
9188 const gfc_symbol* old_target;
9189 unsigned proc_pass_arg, old_pass_arg, argpos;
9190 gfc_formal_arglist* proc_formal;
9191 gfc_formal_arglist* old_formal;
9193 /* This procedure should only be called for non-GENERIC proc. */
9194 gcc_assert (!proc->n.tb->is_generic);
9196 /* If the overwritten procedure is GENERIC, this is an error. */
9197 if (old->n.tb->is_generic)
9199 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9200 old->name, &proc->n.tb->where);
9204 where = proc->n.tb->where;
9205 proc_target = proc->n.tb->u.specific->n.sym;
9206 old_target = old->n.tb->u.specific->n.sym;
9208 /* Check that overridden binding is not NON_OVERRIDABLE. */
9209 if (old->n.tb->non_overridable)
9211 gfc_error ("'%s' at %L overrides a procedure binding declared"
9212 " NON_OVERRIDABLE", proc->name, &where);
9216 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9217 if (!old->n.tb->deferred && proc->n.tb->deferred)
9219 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9220 " non-DEFERRED binding", proc->name, &where);
9224 /* If the overridden binding is PURE, the overriding must be, too. */
9225 if (old_target->attr.pure && !proc_target->attr.pure)
9227 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9228 proc->name, &where);
9232 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9233 is not, the overriding must not be either. */
9234 if (old_target->attr.elemental && !proc_target->attr.elemental)
9236 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
9237 " ELEMENTAL", proc->name, &where);
9240 if (!old_target->attr.elemental && proc_target->attr.elemental)
9242 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
9243 " be ELEMENTAL, either", proc->name, &where);
9247 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
9249 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
9251 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
9252 " SUBROUTINE", proc->name, &where);
9256 /* If the overridden binding is a FUNCTION, the overriding must also be a
9257 FUNCTION and have the same characteristics. */
9258 if (old_target->attr.function)
9260 if (!proc_target->attr.function)
9262 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
9263 " FUNCTION", proc->name, &where);
9267 /* FIXME: Do more comprehensive checking (including, for instance, the
9268 rank and array-shape). */
9269 gcc_assert (proc_target->result && old_target->result);
9270 if (!gfc_compare_types (&proc_target->result->ts,
9271 &old_target->result->ts))
9273 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
9274 " matching result types", proc->name, &where);
9279 /* If the overridden binding is PUBLIC, the overriding one must not be
9281 if (old->n.tb->access == ACCESS_PUBLIC
9282 && proc->n.tb->access == ACCESS_PRIVATE)
9284 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
9285 " PRIVATE", proc->name, &where);
9289 /* Compare the formal argument lists of both procedures. This is also abused
9290 to find the position of the passed-object dummy arguments of both
9291 bindings as at least the overridden one might not yet be resolved and we
9292 need those positions in the check below. */
9293 proc_pass_arg = old_pass_arg = 0;
9294 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
9296 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
9299 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
9300 proc_formal && old_formal;
9301 proc_formal = proc_formal->next, old_formal = old_formal->next)
9303 if (proc->n.tb->pass_arg
9304 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
9305 proc_pass_arg = argpos;
9306 if (old->n.tb->pass_arg
9307 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
9308 old_pass_arg = argpos;
9310 /* Check that the names correspond. */
9311 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
9313 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
9314 " to match the corresponding argument of the overridden"
9315 " procedure", proc_formal->sym->name, proc->name, &where,
9316 old_formal->sym->name);
9320 /* Check that the types correspond if neither is the passed-object
9322 /* FIXME: Do more comprehensive testing here. */
9323 if (proc_pass_arg != argpos && old_pass_arg != argpos
9324 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
9326 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L in"
9327 " in respect to the overridden procedure",
9328 proc_formal->sym->name, proc->name, &where);
9334 if (proc_formal || old_formal)
9336 gfc_error ("'%s' at %L must have the same number of formal arguments as"
9337 " the overridden procedure", proc->name, &where);
9341 /* If the overridden binding is NOPASS, the overriding one must also be
9343 if (old->n.tb->nopass && !proc->n.tb->nopass)
9345 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
9346 " NOPASS", proc->name, &where);
9350 /* If the overridden binding is PASS(x), the overriding one must also be
9351 PASS and the passed-object dummy arguments must correspond. */
9352 if (!old->n.tb->nopass)
9354 if (proc->n.tb->nopass)
9356 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
9357 " PASS", proc->name, &where);
9361 if (proc_pass_arg != old_pass_arg)
9363 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
9364 " the same position as the passed-object dummy argument of"
9365 " the overridden procedure", proc->name, &where);
9374 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
9377 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
9378 const char* generic_name, locus where)
9383 gcc_assert (t1->specific && t2->specific);
9384 gcc_assert (!t1->specific->is_generic);
9385 gcc_assert (!t2->specific->is_generic);
9387 sym1 = t1->specific->u.specific->n.sym;
9388 sym2 = t2->specific->u.specific->n.sym;
9393 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
9394 if (sym1->attr.subroutine != sym2->attr.subroutine
9395 || sym1->attr.function != sym2->attr.function)
9397 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
9398 " GENERIC '%s' at %L",
9399 sym1->name, sym2->name, generic_name, &where);
9403 /* Compare the interfaces. */
9404 if (gfc_compare_interfaces (sym1, sym2, NULL, 1, 0, NULL, 0))
9406 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
9407 sym1->name, sym2->name, generic_name, &where);
9415 /* Worker function for resolving a generic procedure binding; this is used to
9416 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
9418 The difference between those cases is finding possible inherited bindings
9419 that are overridden, as one has to look for them in tb_sym_root,
9420 tb_uop_root or tb_op, respectively. Thus the caller must already find
9421 the super-type and set p->overridden correctly. */
9424 resolve_tb_generic_targets (gfc_symbol* super_type,
9425 gfc_typebound_proc* p, const char* name)
9427 gfc_tbp_generic* target;
9428 gfc_symtree* first_target;
9429 gfc_symtree* inherited;
9431 gcc_assert (p && p->is_generic);
9433 /* Try to find the specific bindings for the symtrees in our target-list. */
9434 gcc_assert (p->u.generic);
9435 for (target = p->u.generic; target; target = target->next)
9436 if (!target->specific)
9438 gfc_typebound_proc* overridden_tbp;
9440 const char* target_name;
9442 target_name = target->specific_st->name;
9444 /* Defined for this type directly. */
9445 if (target->specific_st->n.tb)
9447 target->specific = target->specific_st->n.tb;
9448 goto specific_found;
9451 /* Look for an inherited specific binding. */
9454 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
9459 gcc_assert (inherited->n.tb);
9460 target->specific = inherited->n.tb;
9461 goto specific_found;
9465 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
9466 " at %L", target_name, name, &p->where);
9469 /* Once we've found the specific binding, check it is not ambiguous with
9470 other specifics already found or inherited for the same GENERIC. */
9472 gcc_assert (target->specific);
9474 /* This must really be a specific binding! */
9475 if (target->specific->is_generic)
9477 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
9478 " '%s' is GENERIC, too", name, &p->where, target_name);
9482 /* Check those already resolved on this type directly. */
9483 for (g = p->u.generic; g; g = g->next)
9484 if (g != target && g->specific
9485 && check_generic_tbp_ambiguity (target, g, name, p->where)
9489 /* Check for ambiguity with inherited specific targets. */
9490 for (overridden_tbp = p->overridden; overridden_tbp;
9491 overridden_tbp = overridden_tbp->overridden)
9492 if (overridden_tbp->is_generic)
9494 for (g = overridden_tbp->u.generic; g; g = g->next)
9496 gcc_assert (g->specific);
9497 if (check_generic_tbp_ambiguity (target, g,
9498 name, p->where) == FAILURE)
9504 /* If we attempt to "overwrite" a specific binding, this is an error. */
9505 if (p->overridden && !p->overridden->is_generic)
9507 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
9508 " the same name", name, &p->where);
9512 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
9513 all must have the same attributes here. */
9514 first_target = p->u.generic->specific->u.specific;
9515 gcc_assert (first_target);
9516 p->subroutine = first_target->n.sym->attr.subroutine;
9517 p->function = first_target->n.sym->attr.function;
9523 /* Resolve a GENERIC procedure binding for a derived type. */
9526 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
9528 gfc_symbol* super_type;
9530 /* Find the overridden binding if any. */
9531 st->n.tb->overridden = NULL;
9532 super_type = gfc_get_derived_super_type (derived);
9535 gfc_symtree* overridden;
9536 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
9539 if (overridden && overridden->n.tb)
9540 st->n.tb->overridden = overridden->n.tb;
9543 /* Resolve using worker function. */
9544 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
9548 /* Retrieve the target-procedure of an operator binding and do some checks in
9549 common for intrinsic and user-defined type-bound operators. */
9552 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
9554 gfc_symbol* target_proc;
9556 gcc_assert (target->specific && !target->specific->is_generic);
9557 target_proc = target->specific->u.specific->n.sym;
9558 gcc_assert (target_proc);
9560 /* All operator bindings must have a passed-object dummy argument. */
9561 if (target->specific->nopass)
9563 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
9571 /* Resolve a type-bound intrinsic operator. */
9574 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
9575 gfc_typebound_proc* p)
9577 gfc_symbol* super_type;
9578 gfc_tbp_generic* target;
9580 /* If there's already an error here, do nothing (but don't fail again). */
9584 /* Operators should always be GENERIC bindings. */
9585 gcc_assert (p->is_generic);
9587 /* Look for an overridden binding. */
9588 super_type = gfc_get_derived_super_type (derived);
9589 if (super_type && super_type->f2k_derived)
9590 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
9593 p->overridden = NULL;
9595 /* Resolve general GENERIC properties using worker function. */
9596 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
9599 /* Check the targets to be procedures of correct interface. */
9600 for (target = p->u.generic; target; target = target->next)
9602 gfc_symbol* target_proc;
9604 target_proc = get_checked_tb_operator_target (target, p->where);
9608 if (!gfc_check_operator_interface (target_proc, op, p->where))
9620 /* Resolve a type-bound user operator (tree-walker callback). */
9622 static gfc_symbol* resolve_bindings_derived;
9623 static gfc_try resolve_bindings_result;
9625 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
9628 resolve_typebound_user_op (gfc_symtree* stree)
9630 gfc_symbol* super_type;
9631 gfc_tbp_generic* target;
9633 gcc_assert (stree && stree->n.tb);
9635 if (stree->n.tb->error)
9638 /* Operators should always be GENERIC bindings. */
9639 gcc_assert (stree->n.tb->is_generic);
9641 /* Find overridden procedure, if any. */
9642 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9643 if (super_type && super_type->f2k_derived)
9645 gfc_symtree* overridden;
9646 overridden = gfc_find_typebound_user_op (super_type, NULL,
9647 stree->name, true, NULL);
9649 if (overridden && overridden->n.tb)
9650 stree->n.tb->overridden = overridden->n.tb;
9653 stree->n.tb->overridden = NULL;
9655 /* Resolve basically using worker function. */
9656 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
9660 /* Check the targets to be functions of correct interface. */
9661 for (target = stree->n.tb->u.generic; target; target = target->next)
9663 gfc_symbol* target_proc;
9665 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
9669 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
9676 resolve_bindings_result = FAILURE;
9677 stree->n.tb->error = 1;
9681 /* Resolve the type-bound procedures for a derived type. */
9684 resolve_typebound_procedure (gfc_symtree* stree)
9689 gfc_symbol* super_type;
9690 gfc_component* comp;
9694 /* Undefined specific symbol from GENERIC target definition. */
9698 if (stree->n.tb->error)
9701 /* If this is a GENERIC binding, use that routine. */
9702 if (stree->n.tb->is_generic)
9704 if (resolve_typebound_generic (resolve_bindings_derived, stree)
9710 /* Get the target-procedure to check it. */
9711 gcc_assert (!stree->n.tb->is_generic);
9712 gcc_assert (stree->n.tb->u.specific);
9713 proc = stree->n.tb->u.specific->n.sym;
9714 where = stree->n.tb->where;
9716 /* Default access should already be resolved from the parser. */
9717 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
9719 /* It should be a module procedure or an external procedure with explicit
9720 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
9721 if ((!proc->attr.subroutine && !proc->attr.function)
9722 || (proc->attr.proc != PROC_MODULE
9723 && proc->attr.if_source != IFSRC_IFBODY)
9724 || (proc->attr.abstract && !stree->n.tb->deferred))
9726 gfc_error ("'%s' must be a module procedure or an external procedure with"
9727 " an explicit interface at %L", proc->name, &where);
9730 stree->n.tb->subroutine = proc->attr.subroutine;
9731 stree->n.tb->function = proc->attr.function;
9733 /* Find the super-type of the current derived type. We could do this once and
9734 store in a global if speed is needed, but as long as not I believe this is
9735 more readable and clearer. */
9736 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9738 /* If PASS, resolve and check arguments if not already resolved / loaded
9739 from a .mod file. */
9740 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
9742 if (stree->n.tb->pass_arg)
9744 gfc_formal_arglist* i;
9746 /* If an explicit passing argument name is given, walk the arg-list
9750 stree->n.tb->pass_arg_num = 1;
9751 for (i = proc->formal; i; i = i->next)
9753 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
9758 ++stree->n.tb->pass_arg_num;
9763 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
9765 proc->name, stree->n.tb->pass_arg, &where,
9766 stree->n.tb->pass_arg);
9772 /* Otherwise, take the first one; there should in fact be at least
9774 stree->n.tb->pass_arg_num = 1;
9777 gfc_error ("Procedure '%s' with PASS at %L must have at"
9778 " least one argument", proc->name, &where);
9781 me_arg = proc->formal->sym;
9784 /* Now check that the argument-type matches. */
9785 gcc_assert (me_arg);
9786 if (me_arg->ts.type != BT_CLASS)
9788 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
9789 " at %L", proc->name, &where);
9793 if (me_arg->ts.u.derived->components->ts.u.derived
9794 != resolve_bindings_derived)
9796 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
9797 " the derived-type '%s'", me_arg->name, proc->name,
9798 me_arg->name, &where, resolve_bindings_derived->name);
9804 /* If we are extending some type, check that we don't override a procedure
9805 flagged NON_OVERRIDABLE. */
9806 stree->n.tb->overridden = NULL;
9809 gfc_symtree* overridden;
9810 overridden = gfc_find_typebound_proc (super_type, NULL,
9811 stree->name, true, NULL);
9813 if (overridden && overridden->n.tb)
9814 stree->n.tb->overridden = overridden->n.tb;
9816 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
9820 /* See if there's a name collision with a component directly in this type. */
9821 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
9822 if (!strcmp (comp->name, stree->name))
9824 gfc_error ("Procedure '%s' at %L has the same name as a component of"
9826 stree->name, &where, resolve_bindings_derived->name);
9830 /* Try to find a name collision with an inherited component. */
9831 if (super_type && gfc_find_component (super_type, stree->name, true, true))
9833 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
9834 " component of '%s'",
9835 stree->name, &where, resolve_bindings_derived->name);
9839 stree->n.tb->error = 0;
9843 resolve_bindings_result = FAILURE;
9844 stree->n.tb->error = 1;
9848 resolve_typebound_procedures (gfc_symbol* derived)
9852 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
9855 resolve_bindings_derived = derived;
9856 resolve_bindings_result = SUCCESS;
9858 if (derived->f2k_derived->tb_sym_root)
9859 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
9860 &resolve_typebound_procedure);
9862 if (derived->f2k_derived->tb_uop_root)
9863 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
9864 &resolve_typebound_user_op);
9866 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
9868 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
9869 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
9871 resolve_bindings_result = FAILURE;
9874 return resolve_bindings_result;
9878 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
9879 to give all identical derived types the same backend_decl. */
9881 add_dt_to_dt_list (gfc_symbol *derived)
9883 gfc_dt_list *dt_list;
9885 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
9886 if (derived == dt_list->derived)
9889 if (dt_list == NULL)
9891 dt_list = gfc_get_dt_list ();
9892 dt_list->next = gfc_derived_types;
9893 dt_list->derived = derived;
9894 gfc_derived_types = dt_list;
9899 /* Ensure that a derived-type is really not abstract, meaning that every
9900 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
9903 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
9908 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
9910 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
9913 if (st->n.tb && st->n.tb->deferred)
9915 gfc_symtree* overriding;
9916 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
9917 gcc_assert (overriding && overriding->n.tb);
9918 if (overriding->n.tb->deferred)
9920 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
9921 " '%s' is DEFERRED and not overridden",
9922 sub->name, &sub->declared_at, st->name);
9931 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
9933 /* The algorithm used here is to recursively travel up the ancestry of sub
9934 and for each ancestor-type, check all bindings. If any of them is
9935 DEFERRED, look it up starting from sub and see if the found (overriding)
9936 binding is not DEFERRED.
9937 This is not the most efficient way to do this, but it should be ok and is
9938 clearer than something sophisticated. */
9940 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
9942 /* Walk bindings of this ancestor. */
9943 if (ancestor->f2k_derived)
9946 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
9951 /* Find next ancestor type and recurse on it. */
9952 ancestor = gfc_get_derived_super_type (ancestor);
9954 return ensure_not_abstract (sub, ancestor);
9960 static void resolve_symbol (gfc_symbol *sym);
9963 /* Resolve the components of a derived type. */
9966 resolve_fl_derived (gfc_symbol *sym)
9968 gfc_symbol* super_type;
9972 super_type = gfc_get_derived_super_type (sym);
9974 /* Ensure the extended type gets resolved before we do. */
9975 if (super_type && resolve_fl_derived (super_type) == FAILURE)
9978 /* An ABSTRACT type must be extensible. */
9979 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
9981 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
9982 sym->name, &sym->declared_at);
9986 for (c = sym->components; c != NULL; c = c->next)
9988 if (c->attr.proc_pointer && c->ts.interface)
9990 if (c->ts.interface->attr.procedure)
9991 gfc_error ("Interface '%s', used by procedure pointer component "
9992 "'%s' at %L, is declared in a later PROCEDURE statement",
9993 c->ts.interface->name, c->name, &c->loc);
9995 /* Get the attributes from the interface (now resolved). */
9996 if (c->ts.interface->attr.if_source
9997 || c->ts.interface->attr.intrinsic)
9999 gfc_symbol *ifc = c->ts.interface;
10001 if (ifc->formal && !ifc->formal_ns)
10002 resolve_symbol (ifc);
10004 if (ifc->attr.intrinsic)
10005 resolve_intrinsic (ifc, &ifc->declared_at);
10009 c->ts = ifc->result->ts;
10010 c->attr.allocatable = ifc->result->attr.allocatable;
10011 c->attr.pointer = ifc->result->attr.pointer;
10012 c->attr.dimension = ifc->result->attr.dimension;
10013 c->as = gfc_copy_array_spec (ifc->result->as);
10018 c->attr.allocatable = ifc->attr.allocatable;
10019 c->attr.pointer = ifc->attr.pointer;
10020 c->attr.dimension = ifc->attr.dimension;
10021 c->as = gfc_copy_array_spec (ifc->as);
10023 c->ts.interface = ifc;
10024 c->attr.function = ifc->attr.function;
10025 c->attr.subroutine = ifc->attr.subroutine;
10026 gfc_copy_formal_args_ppc (c, ifc);
10028 c->attr.pure = ifc->attr.pure;
10029 c->attr.elemental = ifc->attr.elemental;
10030 c->attr.recursive = ifc->attr.recursive;
10031 c->attr.always_explicit = ifc->attr.always_explicit;
10032 c->attr.ext_attr |= ifc->attr.ext_attr;
10033 /* Replace symbols in array spec. */
10037 for (i = 0; i < c->as->rank; i++)
10039 gfc_expr_replace_comp (c->as->lower[i], c);
10040 gfc_expr_replace_comp (c->as->upper[i], c);
10043 /* Copy char length. */
10044 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10046 c->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10047 gfc_expr_replace_comp (c->ts.u.cl->length, c);
10050 else if (c->ts.interface->name[0] != '\0')
10052 gfc_error ("Interface '%s' of procedure pointer component "
10053 "'%s' at %L must be explicit", c->ts.interface->name,
10058 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10060 c->ts = *gfc_get_default_type (c->name, NULL);
10061 c->attr.implicit_type = 1;
10064 /* Procedure pointer components: Check PASS arg. */
10065 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0)
10067 gfc_symbol* me_arg;
10069 if (c->tb->pass_arg)
10071 gfc_formal_arglist* i;
10073 /* If an explicit passing argument name is given, walk the arg-list
10074 and look for it. */
10077 c->tb->pass_arg_num = 1;
10078 for (i = c->formal; i; i = i->next)
10080 if (!strcmp (i->sym->name, c->tb->pass_arg))
10085 c->tb->pass_arg_num++;
10090 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10091 "at %L has no argument '%s'", c->name,
10092 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10099 /* Otherwise, take the first one; there should in fact be at least
10101 c->tb->pass_arg_num = 1;
10104 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10105 "must have at least one argument",
10110 me_arg = c->formal->sym;
10113 /* Now check that the argument-type matches. */
10114 gcc_assert (me_arg);
10115 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10116 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10117 || (me_arg->ts.type == BT_CLASS
10118 && me_arg->ts.u.derived->components->ts.u.derived != sym))
10120 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10121 " the derived type '%s'", me_arg->name, c->name,
10122 me_arg->name, &c->loc, sym->name);
10127 /* Check for C453. */
10128 if (me_arg->attr.dimension)
10130 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10131 "must be scalar", me_arg->name, c->name, me_arg->name,
10137 if (me_arg->attr.pointer)
10139 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10140 "may not have the POINTER attribute", me_arg->name,
10141 c->name, me_arg->name, &c->loc);
10146 if (me_arg->attr.allocatable)
10148 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10149 "may not be ALLOCATABLE", me_arg->name, c->name,
10150 me_arg->name, &c->loc);
10155 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
10156 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10157 " at %L", c->name, &c->loc);
10161 /* Check type-spec if this is not the parent-type component. */
10162 if ((!sym->attr.extension || c != sym->components)
10163 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
10166 /* If this type is an extension, see if this component has the same name
10167 as an inherited type-bound procedure. */
10169 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
10171 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
10172 " inherited type-bound procedure",
10173 c->name, sym->name, &c->loc);
10177 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
10179 if (c->ts.u.cl->length == NULL
10180 || (resolve_charlen (c->ts.u.cl) == FAILURE)
10181 || !gfc_is_constant_expr (c->ts.u.cl->length))
10183 gfc_error ("Character length of component '%s' needs to "
10184 "be a constant specification expression at %L",
10186 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
10191 if (c->ts.type == BT_DERIVED
10192 && sym->component_access != ACCESS_PRIVATE
10193 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10194 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
10195 && !c->ts.u.derived->attr.use_assoc
10196 && !gfc_check_access (c->ts.u.derived->attr.access,
10197 c->ts.u.derived->ns->default_access)
10198 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
10199 "is a PRIVATE type and cannot be a component of "
10200 "'%s', which is PUBLIC at %L", c->name,
10201 sym->name, &sym->declared_at) == FAILURE)
10204 if (sym->attr.sequence)
10206 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
10208 gfc_error ("Component %s of SEQUENCE type declared at %L does "
10209 "not have the SEQUENCE attribute",
10210 c->ts.u.derived->name, &sym->declared_at);
10215 if (c->ts.type == BT_DERIVED && c->attr.pointer
10216 && c->ts.u.derived->components == NULL
10217 && !c->ts.u.derived->attr.zero_comp)
10219 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10220 "that has not been declared", c->name, sym->name,
10226 if (c->ts.type == BT_CLASS
10227 && !(c->ts.u.derived->components->attr.pointer
10228 || c->ts.u.derived->components->attr.allocatable))
10230 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
10231 "or pointer", c->name, &c->loc);
10235 /* Ensure that all the derived type components are put on the
10236 derived type list; even in formal namespaces, where derived type
10237 pointer components might not have been declared. */
10238 if (c->ts.type == BT_DERIVED
10240 && c->ts.u.derived->components
10242 && sym != c->ts.u.derived)
10243 add_dt_to_dt_list (c->ts.u.derived);
10245 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
10249 for (i = 0; i < c->as->rank; i++)
10251 if (c->as->lower[i] == NULL
10252 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
10253 || !gfc_is_constant_expr (c->as->lower[i])
10254 || c->as->upper[i] == NULL
10255 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
10256 || !gfc_is_constant_expr (c->as->upper[i]))
10258 gfc_error ("Component '%s' of '%s' at %L must have "
10259 "constant array bounds",
10260 c->name, sym->name, &c->loc);
10266 /* Resolve the type-bound procedures. */
10267 if (resolve_typebound_procedures (sym) == FAILURE)
10270 /* Resolve the finalizer procedures. */
10271 if (gfc_resolve_finalizers (sym) == FAILURE)
10274 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
10275 all DEFERRED bindings are overridden. */
10276 if (super_type && super_type->attr.abstract && !sym->attr.abstract
10277 && ensure_not_abstract (sym, super_type) == FAILURE)
10280 /* Add derived type to the derived type list. */
10281 add_dt_to_dt_list (sym);
10288 resolve_fl_namelist (gfc_symbol *sym)
10293 /* Reject PRIVATE objects in a PUBLIC namelist. */
10294 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
10296 for (nl = sym->namelist; nl; nl = nl->next)
10298 if (!nl->sym->attr.use_assoc
10299 && !is_sym_host_assoc (nl->sym, sym->ns)
10300 && !gfc_check_access(nl->sym->attr.access,
10301 nl->sym->ns->default_access))
10303 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
10304 "cannot be member of PUBLIC namelist '%s' at %L",
10305 nl->sym->name, sym->name, &sym->declared_at);
10309 /* Types with private components that came here by USE-association. */
10310 if (nl->sym->ts.type == BT_DERIVED
10311 && derived_inaccessible (nl->sym->ts.u.derived))
10313 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
10314 "components and cannot be member of namelist '%s' at %L",
10315 nl->sym->name, sym->name, &sym->declared_at);
10319 /* Types with private components that are defined in the same module. */
10320 if (nl->sym->ts.type == BT_DERIVED
10321 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
10322 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
10323 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
10324 nl->sym->ns->default_access))
10326 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
10327 "cannot be a member of PUBLIC namelist '%s' at %L",
10328 nl->sym->name, sym->name, &sym->declared_at);
10334 for (nl = sym->namelist; nl; nl = nl->next)
10336 /* Reject namelist arrays of assumed shape. */
10337 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
10338 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
10339 "must not have assumed shape in namelist "
10340 "'%s' at %L", nl->sym->name, sym->name,
10341 &sym->declared_at) == FAILURE)
10344 /* Reject namelist arrays that are not constant shape. */
10345 if (is_non_constant_shape_array (nl->sym))
10347 gfc_error ("NAMELIST array object '%s' must have constant "
10348 "shape in namelist '%s' at %L", nl->sym->name,
10349 sym->name, &sym->declared_at);
10353 /* Namelist objects cannot have allocatable or pointer components. */
10354 if (nl->sym->ts.type != BT_DERIVED)
10357 if (nl->sym->ts.u.derived->attr.alloc_comp)
10359 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10360 "have ALLOCATABLE components",
10361 nl->sym->name, sym->name, &sym->declared_at);
10365 if (nl->sym->ts.u.derived->attr.pointer_comp)
10367 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10368 "have POINTER components",
10369 nl->sym->name, sym->name, &sym->declared_at);
10375 /* 14.1.2 A module or internal procedure represent local entities
10376 of the same type as a namelist member and so are not allowed. */
10377 for (nl = sym->namelist; nl; nl = nl->next)
10379 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
10382 if (nl->sym->attr.function && nl->sym == nl->sym->result)
10383 if ((nl->sym == sym->ns->proc_name)
10385 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
10389 if (nl->sym && nl->sym->name)
10390 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
10391 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
10393 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
10394 "attribute in '%s' at %L", nlsym->name,
10395 &sym->declared_at);
10405 resolve_fl_parameter (gfc_symbol *sym)
10407 /* A parameter array's shape needs to be constant. */
10408 if (sym->as != NULL
10409 && (sym->as->type == AS_DEFERRED
10410 || is_non_constant_shape_array (sym)))
10412 gfc_error ("Parameter array '%s' at %L cannot be automatic "
10413 "or of deferred shape", sym->name, &sym->declared_at);
10417 /* Make sure a parameter that has been implicitly typed still
10418 matches the implicit type, since PARAMETER statements can precede
10419 IMPLICIT statements. */
10420 if (sym->attr.implicit_type
10421 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
10424 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
10425 "later IMPLICIT type", sym->name, &sym->declared_at);
10429 /* Make sure the types of derived parameters are consistent. This
10430 type checking is deferred until resolution because the type may
10431 refer to a derived type from the host. */
10432 if (sym->ts.type == BT_DERIVED
10433 && !gfc_compare_types (&sym->ts, &sym->value->ts))
10435 gfc_error ("Incompatible derived type in PARAMETER at %L",
10436 &sym->value->where);
10443 /* Do anything necessary to resolve a symbol. Right now, we just
10444 assume that an otherwise unknown symbol is a variable. This sort
10445 of thing commonly happens for symbols in module. */
10448 resolve_symbol (gfc_symbol *sym)
10450 int check_constant, mp_flag;
10451 gfc_symtree *symtree;
10452 gfc_symtree *this_symtree;
10456 if (sym->attr.flavor == FL_UNKNOWN)
10459 /* If we find that a flavorless symbol is an interface in one of the
10460 parent namespaces, find its symtree in this namespace, free the
10461 symbol and set the symtree to point to the interface symbol. */
10462 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
10464 symtree = gfc_find_symtree (ns->sym_root, sym->name);
10465 if (symtree && symtree->n.sym->generic)
10467 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
10471 gfc_free_symbol (sym);
10472 symtree->n.sym->refs++;
10473 this_symtree->n.sym = symtree->n.sym;
10478 /* Otherwise give it a flavor according to such attributes as
10480 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
10481 sym->attr.flavor = FL_VARIABLE;
10484 sym->attr.flavor = FL_PROCEDURE;
10485 if (sym->attr.dimension)
10486 sym->attr.function = 1;
10490 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
10491 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
10493 if (sym->attr.procedure && sym->ts.interface
10494 && sym->attr.if_source != IFSRC_DECL)
10496 if (sym->ts.interface == sym)
10498 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
10499 "interface", sym->name, &sym->declared_at);
10502 if (sym->ts.interface->attr.procedure)
10504 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
10505 " in a later PROCEDURE statement", sym->ts.interface->name,
10506 sym->name,&sym->declared_at);
10510 /* Get the attributes from the interface (now resolved). */
10511 if (sym->ts.interface->attr.if_source
10512 || sym->ts.interface->attr.intrinsic)
10514 gfc_symbol *ifc = sym->ts.interface;
10515 resolve_symbol (ifc);
10517 if (ifc->attr.intrinsic)
10518 resolve_intrinsic (ifc, &ifc->declared_at);
10521 sym->ts = ifc->result->ts;
10524 sym->ts.interface = ifc;
10525 sym->attr.function = ifc->attr.function;
10526 sym->attr.subroutine = ifc->attr.subroutine;
10527 gfc_copy_formal_args (sym, ifc);
10529 sym->attr.allocatable = ifc->attr.allocatable;
10530 sym->attr.pointer = ifc->attr.pointer;
10531 sym->attr.pure = ifc->attr.pure;
10532 sym->attr.elemental = ifc->attr.elemental;
10533 sym->attr.dimension = ifc->attr.dimension;
10534 sym->attr.recursive = ifc->attr.recursive;
10535 sym->attr.always_explicit = ifc->attr.always_explicit;
10536 sym->attr.ext_attr |= ifc->attr.ext_attr;
10537 /* Copy array spec. */
10538 sym->as = gfc_copy_array_spec (ifc->as);
10542 for (i = 0; i < sym->as->rank; i++)
10544 gfc_expr_replace_symbols (sym->as->lower[i], sym);
10545 gfc_expr_replace_symbols (sym->as->upper[i], sym);
10548 /* Copy char length. */
10549 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10551 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10552 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
10555 else if (sym->ts.interface->name[0] != '\0')
10557 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
10558 sym->ts.interface->name, sym->name, &sym->declared_at);
10563 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
10566 /* Symbols that are module procedures with results (functions) have
10567 the types and array specification copied for type checking in
10568 procedures that call them, as well as for saving to a module
10569 file. These symbols can't stand the scrutiny that their results
10571 mp_flag = (sym->result != NULL && sym->result != sym);
10574 /* Make sure that the intrinsic is consistent with its internal
10575 representation. This needs to be done before assigning a default
10576 type to avoid spurious warnings. */
10577 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
10578 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
10581 /* Assign default type to symbols that need one and don't have one. */
10582 if (sym->ts.type == BT_UNKNOWN)
10584 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
10585 gfc_set_default_type (sym, 1, NULL);
10587 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
10588 && !sym->attr.function && !sym->attr.subroutine
10589 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
10590 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
10592 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
10594 /* The specific case of an external procedure should emit an error
10595 in the case that there is no implicit type. */
10597 gfc_set_default_type (sym, sym->attr.external, NULL);
10600 /* Result may be in another namespace. */
10601 resolve_symbol (sym->result);
10603 if (!sym->result->attr.proc_pointer)
10605 sym->ts = sym->result->ts;
10606 sym->as = gfc_copy_array_spec (sym->result->as);
10607 sym->attr.dimension = sym->result->attr.dimension;
10608 sym->attr.pointer = sym->result->attr.pointer;
10609 sym->attr.allocatable = sym->result->attr.allocatable;
10615 /* Assumed size arrays and assumed shape arrays must be dummy
10618 if (sym->as != NULL
10619 && (sym->as->type == AS_ASSUMED_SIZE
10620 || sym->as->type == AS_ASSUMED_SHAPE)
10621 && sym->attr.dummy == 0)
10623 if (sym->as->type == AS_ASSUMED_SIZE)
10624 gfc_error ("Assumed size array at %L must be a dummy argument",
10625 &sym->declared_at);
10627 gfc_error ("Assumed shape array at %L must be a dummy argument",
10628 &sym->declared_at);
10632 /* Make sure symbols with known intent or optional are really dummy
10633 variable. Because of ENTRY statement, this has to be deferred
10634 until resolution time. */
10636 if (!sym->attr.dummy
10637 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
10639 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
10643 if (sym->attr.value && !sym->attr.dummy)
10645 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
10646 "it is not a dummy argument", sym->name, &sym->declared_at);
10650 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
10652 gfc_charlen *cl = sym->ts.u.cl;
10653 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10655 gfc_error ("Character dummy variable '%s' at %L with VALUE "
10656 "attribute must have constant length",
10657 sym->name, &sym->declared_at);
10661 if (sym->ts.is_c_interop
10662 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
10664 gfc_error ("C interoperable character dummy variable '%s' at %L "
10665 "with VALUE attribute must have length one",
10666 sym->name, &sym->declared_at);
10671 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
10672 do this for something that was implicitly typed because that is handled
10673 in gfc_set_default_type. Handle dummy arguments and procedure
10674 definitions separately. Also, anything that is use associated is not
10675 handled here but instead is handled in the module it is declared in.
10676 Finally, derived type definitions are allowed to be BIND(C) since that
10677 only implies that they're interoperable, and they are checked fully for
10678 interoperability when a variable is declared of that type. */
10679 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
10680 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
10681 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
10683 gfc_try t = SUCCESS;
10685 /* First, make sure the variable is declared at the
10686 module-level scope (J3/04-007, Section 15.3). */
10687 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
10688 sym->attr.in_common == 0)
10690 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
10691 "is neither a COMMON block nor declared at the "
10692 "module level scope", sym->name, &(sym->declared_at));
10695 else if (sym->common_head != NULL)
10697 t = verify_com_block_vars_c_interop (sym->common_head);
10701 /* If type() declaration, we need to verify that the components
10702 of the given type are all C interoperable, etc. */
10703 if (sym->ts.type == BT_DERIVED &&
10704 sym->ts.u.derived->attr.is_c_interop != 1)
10706 /* Make sure the user marked the derived type as BIND(C). If
10707 not, call the verify routine. This could print an error
10708 for the derived type more than once if multiple variables
10709 of that type are declared. */
10710 if (sym->ts.u.derived->attr.is_bind_c != 1)
10711 verify_bind_c_derived_type (sym->ts.u.derived);
10715 /* Verify the variable itself as C interoperable if it
10716 is BIND(C). It is not possible for this to succeed if
10717 the verify_bind_c_derived_type failed, so don't have to handle
10718 any error returned by verify_bind_c_derived_type. */
10719 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
10720 sym->common_block);
10725 /* clear the is_bind_c flag to prevent reporting errors more than
10726 once if something failed. */
10727 sym->attr.is_bind_c = 0;
10732 /* If a derived type symbol has reached this point, without its
10733 type being declared, we have an error. Notice that most
10734 conditions that produce undefined derived types have already
10735 been dealt with. However, the likes of:
10736 implicit type(t) (t) ..... call foo (t) will get us here if
10737 the type is not declared in the scope of the implicit
10738 statement. Change the type to BT_UNKNOWN, both because it is so
10739 and to prevent an ICE. */
10740 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
10741 && !sym->ts.u.derived->attr.zero_comp)
10743 gfc_error ("The derived type '%s' at %L is of type '%s', "
10744 "which has not been defined", sym->name,
10745 &sym->declared_at, sym->ts.u.derived->name);
10746 sym->ts.type = BT_UNKNOWN;
10750 /* Make sure that the derived type has been resolved and that the
10751 derived type is visible in the symbol's namespace, if it is a
10752 module function and is not PRIVATE. */
10753 if (sym->ts.type == BT_DERIVED
10754 && sym->ts.u.derived->attr.use_assoc
10755 && sym->ns->proc_name
10756 && sym->ns->proc_name->attr.flavor == FL_MODULE)
10760 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
10763 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
10764 if (!ds && sym->attr.function
10765 && gfc_check_access (sym->attr.access, sym->ns->default_access))
10767 symtree = gfc_new_symtree (&sym->ns->sym_root,
10768 sym->ts.u.derived->name);
10769 symtree->n.sym = sym->ts.u.derived;
10770 sym->ts.u.derived->refs++;
10774 /* Unless the derived-type declaration is use associated, Fortran 95
10775 does not allow public entries of private derived types.
10776 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
10777 161 in 95-006r3. */
10778 if (sym->ts.type == BT_DERIVED
10779 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
10780 && !sym->ts.u.derived->attr.use_assoc
10781 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10782 && !gfc_check_access (sym->ts.u.derived->attr.access,
10783 sym->ts.u.derived->ns->default_access)
10784 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
10785 "of PRIVATE derived type '%s'",
10786 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
10787 : "variable", sym->name, &sym->declared_at,
10788 sym->ts.u.derived->name) == FAILURE)
10791 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
10792 default initialization is defined (5.1.2.4.4). */
10793 if (sym->ts.type == BT_DERIVED
10795 && sym->attr.intent == INTENT_OUT
10797 && sym->as->type == AS_ASSUMED_SIZE)
10799 for (c = sym->ts.u.derived->components; c; c = c->next)
10801 if (c->initializer)
10803 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
10804 "ASSUMED SIZE and so cannot have a default initializer",
10805 sym->name, &sym->declared_at);
10811 switch (sym->attr.flavor)
10814 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
10819 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
10824 if (resolve_fl_namelist (sym) == FAILURE)
10829 if (resolve_fl_parameter (sym) == FAILURE)
10837 /* Resolve array specifier. Check as well some constraints
10838 on COMMON blocks. */
10840 check_constant = sym->attr.in_common && !sym->attr.pointer;
10842 /* Set the formal_arg_flag so that check_conflict will not throw
10843 an error for host associated variables in the specification
10844 expression for an array_valued function. */
10845 if (sym->attr.function && sym->as)
10846 formal_arg_flag = 1;
10848 gfc_resolve_array_spec (sym->as, check_constant);
10850 formal_arg_flag = 0;
10852 /* Resolve formal namespaces. */
10853 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
10854 && !sym->attr.contained && !sym->attr.intrinsic)
10855 gfc_resolve (sym->formal_ns);
10857 /* Make sure the formal namespace is present. */
10858 if (sym->formal && !sym->formal_ns)
10860 gfc_formal_arglist *formal = sym->formal;
10861 while (formal && !formal->sym)
10862 formal = formal->next;
10866 sym->formal_ns = formal->sym->ns;
10867 sym->formal_ns->refs++;
10871 /* Check threadprivate restrictions. */
10872 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
10873 && (!sym->attr.in_common
10874 && sym->module == NULL
10875 && (sym->ns->proc_name == NULL
10876 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
10877 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
10879 /* If we have come this far we can apply default-initializers, as
10880 described in 14.7.5, to those variables that have not already
10881 been assigned one. */
10882 if (sym->ts.type == BT_DERIVED
10883 && sym->attr.referenced
10884 && sym->ns == gfc_current_ns
10886 && !sym->attr.allocatable
10887 && !sym->attr.alloc_comp)
10889 symbol_attribute *a = &sym->attr;
10891 if ((!a->save && !a->dummy && !a->pointer
10892 && !a->in_common && !a->use_assoc
10893 && !(a->function && sym != sym->result))
10894 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
10895 apply_default_init (sym);
10898 /* If this symbol has a type-spec, check it. */
10899 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
10900 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
10901 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
10907 /************* Resolve DATA statements *************/
10911 gfc_data_value *vnode;
10917 /* Advance the values structure to point to the next value in the data list. */
10920 next_data_value (void)
10922 while (mpz_cmp_ui (values.left, 0) == 0)
10924 if (!gfc_is_constant_expr (values.vnode->expr))
10925 gfc_error ("non-constant DATA value at %L",
10926 &values.vnode->expr->where);
10928 if (values.vnode->next == NULL)
10931 values.vnode = values.vnode->next;
10932 mpz_set (values.left, values.vnode->repeat);
10940 check_data_variable (gfc_data_variable *var, locus *where)
10946 ar_type mark = AR_UNKNOWN;
10948 mpz_t section_index[GFC_MAX_DIMENSIONS];
10954 if (gfc_resolve_expr (var->expr) == FAILURE)
10958 mpz_init_set_si (offset, 0);
10961 if (e->expr_type != EXPR_VARIABLE)
10962 gfc_internal_error ("check_data_variable(): Bad expression");
10964 sym = e->symtree->n.sym;
10966 if (sym->ns->is_block_data && !sym->attr.in_common)
10968 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
10969 sym->name, &sym->declared_at);
10972 if (e->ref == NULL && sym->as)
10974 gfc_error ("DATA array '%s' at %L must be specified in a previous"
10975 " declaration", sym->name, where);
10979 has_pointer = sym->attr.pointer;
10981 for (ref = e->ref; ref; ref = ref->next)
10983 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
10987 && ref->type == REF_ARRAY
10988 && ref->u.ar.type != AR_FULL)
10990 gfc_error ("DATA element '%s' at %L is a pointer and so must "
10991 "be a full array", sym->name, where);
10996 if (e->rank == 0 || has_pointer)
10998 mpz_init_set_ui (size, 1);
11005 /* Find the array section reference. */
11006 for (ref = e->ref; ref; ref = ref->next)
11008 if (ref->type != REF_ARRAY)
11010 if (ref->u.ar.type == AR_ELEMENT)
11016 /* Set marks according to the reference pattern. */
11017 switch (ref->u.ar.type)
11025 /* Get the start position of array section. */
11026 gfc_get_section_index (ar, section_index, &offset);
11031 gcc_unreachable ();
11034 if (gfc_array_size (e, &size) == FAILURE)
11036 gfc_error ("Nonconstant array section at %L in DATA statement",
11038 mpz_clear (offset);
11045 while (mpz_cmp_ui (size, 0) > 0)
11047 if (next_data_value () == FAILURE)
11049 gfc_error ("DATA statement at %L has more variables than values",
11055 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
11059 /* If we have more than one element left in the repeat count,
11060 and we have more than one element left in the target variable,
11061 then create a range assignment. */
11062 /* FIXME: Only done for full arrays for now, since array sections
11064 if (mark == AR_FULL && ref && ref->next == NULL
11065 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
11069 if (mpz_cmp (size, values.left) >= 0)
11071 mpz_init_set (range, values.left);
11072 mpz_sub (size, size, values.left);
11073 mpz_set_ui (values.left, 0);
11077 mpz_init_set (range, size);
11078 mpz_sub (values.left, values.left, size);
11079 mpz_set_ui (size, 0);
11082 gfc_assign_data_value_range (var->expr, values.vnode->expr,
11085 mpz_add (offset, offset, range);
11089 /* Assign initial value to symbol. */
11092 mpz_sub_ui (values.left, values.left, 1);
11093 mpz_sub_ui (size, size, 1);
11095 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
11099 if (mark == AR_FULL)
11100 mpz_add_ui (offset, offset, 1);
11102 /* Modify the array section indexes and recalculate the offset
11103 for next element. */
11104 else if (mark == AR_SECTION)
11105 gfc_advance_section (section_index, ar, &offset);
11109 if (mark == AR_SECTION)
11111 for (i = 0; i < ar->dimen; i++)
11112 mpz_clear (section_index[i]);
11116 mpz_clear (offset);
11122 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
11124 /* Iterate over a list of elements in a DATA statement. */
11127 traverse_data_list (gfc_data_variable *var, locus *where)
11130 iterator_stack frame;
11131 gfc_expr *e, *start, *end, *step;
11132 gfc_try retval = SUCCESS;
11134 mpz_init (frame.value);
11136 start = gfc_copy_expr (var->iter.start);
11137 end = gfc_copy_expr (var->iter.end);
11138 step = gfc_copy_expr (var->iter.step);
11140 if (gfc_simplify_expr (start, 1) == FAILURE
11141 || start->expr_type != EXPR_CONSTANT)
11143 gfc_error ("iterator start at %L does not simplify", &start->where);
11147 if (gfc_simplify_expr (end, 1) == FAILURE
11148 || end->expr_type != EXPR_CONSTANT)
11150 gfc_error ("iterator end at %L does not simplify", &end->where);
11154 if (gfc_simplify_expr (step, 1) == FAILURE
11155 || step->expr_type != EXPR_CONSTANT)
11157 gfc_error ("iterator step at %L does not simplify", &step->where);
11162 mpz_init_set (trip, end->value.integer);
11163 mpz_sub (trip, trip, start->value.integer);
11164 mpz_add (trip, trip, step->value.integer);
11166 mpz_div (trip, trip, step->value.integer);
11168 mpz_set (frame.value, start->value.integer);
11170 frame.prev = iter_stack;
11171 frame.variable = var->iter.var->symtree;
11172 iter_stack = &frame;
11174 while (mpz_cmp_ui (trip, 0) > 0)
11176 if (traverse_data_var (var->list, where) == FAILURE)
11183 e = gfc_copy_expr (var->expr);
11184 if (gfc_simplify_expr (e, 1) == FAILURE)
11192 mpz_add (frame.value, frame.value, step->value.integer);
11194 mpz_sub_ui (trip, trip, 1);
11199 mpz_clear (frame.value);
11201 gfc_free_expr (start);
11202 gfc_free_expr (end);
11203 gfc_free_expr (step);
11205 iter_stack = frame.prev;
11210 /* Type resolve variables in the variable list of a DATA statement. */
11213 traverse_data_var (gfc_data_variable *var, locus *where)
11217 for (; var; var = var->next)
11219 if (var->expr == NULL)
11220 t = traverse_data_list (var, where);
11222 t = check_data_variable (var, where);
11232 /* Resolve the expressions and iterators associated with a data statement.
11233 This is separate from the assignment checking because data lists should
11234 only be resolved once. */
11237 resolve_data_variables (gfc_data_variable *d)
11239 for (; d; d = d->next)
11241 if (d->list == NULL)
11243 if (gfc_resolve_expr (d->expr) == FAILURE)
11248 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
11251 if (resolve_data_variables (d->list) == FAILURE)
11260 /* Resolve a single DATA statement. We implement this by storing a pointer to
11261 the value list into static variables, and then recursively traversing the
11262 variables list, expanding iterators and such. */
11265 resolve_data (gfc_data *d)
11268 if (resolve_data_variables (d->var) == FAILURE)
11271 values.vnode = d->value;
11272 if (d->value == NULL)
11273 mpz_set_ui (values.left, 0);
11275 mpz_set (values.left, d->value->repeat);
11277 if (traverse_data_var (d->var, &d->where) == FAILURE)
11280 /* At this point, we better not have any values left. */
11282 if (next_data_value () == SUCCESS)
11283 gfc_error ("DATA statement at %L has more values than variables",
11288 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
11289 accessed by host or use association, is a dummy argument to a pure function,
11290 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
11291 is storage associated with any such variable, shall not be used in the
11292 following contexts: (clients of this function). */
11294 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
11295 procedure. Returns zero if assignment is OK, nonzero if there is a
11298 gfc_impure_variable (gfc_symbol *sym)
11302 if (sym->attr.use_assoc || sym->attr.in_common)
11305 if (sym->ns != gfc_current_ns)
11306 return !sym->attr.function;
11308 proc = sym->ns->proc_name;
11309 if (sym->attr.dummy && gfc_pure (proc)
11310 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
11312 proc->attr.function))
11315 /* TODO: Sort out what can be storage associated, if anything, and include
11316 it here. In principle equivalences should be scanned but it does not
11317 seem to be possible to storage associate an impure variable this way. */
11322 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
11323 symbol of the current procedure. */
11326 gfc_pure (gfc_symbol *sym)
11328 symbol_attribute attr;
11331 sym = gfc_current_ns->proc_name;
11337 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
11341 /* Test whether the current procedure is elemental or not. */
11344 gfc_elemental (gfc_symbol *sym)
11346 symbol_attribute attr;
11349 sym = gfc_current_ns->proc_name;
11354 return attr.flavor == FL_PROCEDURE && attr.elemental;
11358 /* Warn about unused labels. */
11361 warn_unused_fortran_label (gfc_st_label *label)
11366 warn_unused_fortran_label (label->left);
11368 if (label->defined == ST_LABEL_UNKNOWN)
11371 switch (label->referenced)
11373 case ST_LABEL_UNKNOWN:
11374 gfc_warning ("Label %d at %L defined but not used", label->value,
11378 case ST_LABEL_BAD_TARGET:
11379 gfc_warning ("Label %d at %L defined but cannot be used",
11380 label->value, &label->where);
11387 warn_unused_fortran_label (label->right);
11391 /* Returns the sequence type of a symbol or sequence. */
11394 sequence_type (gfc_typespec ts)
11403 if (ts.u.derived->components == NULL)
11404 return SEQ_NONDEFAULT;
11406 result = sequence_type (ts.u.derived->components->ts);
11407 for (c = ts.u.derived->components->next; c; c = c->next)
11408 if (sequence_type (c->ts) != result)
11414 if (ts.kind != gfc_default_character_kind)
11415 return SEQ_NONDEFAULT;
11417 return SEQ_CHARACTER;
11420 if (ts.kind != gfc_default_integer_kind)
11421 return SEQ_NONDEFAULT;
11423 return SEQ_NUMERIC;
11426 if (!(ts.kind == gfc_default_real_kind
11427 || ts.kind == gfc_default_double_kind))
11428 return SEQ_NONDEFAULT;
11430 return SEQ_NUMERIC;
11433 if (ts.kind != gfc_default_complex_kind)
11434 return SEQ_NONDEFAULT;
11436 return SEQ_NUMERIC;
11439 if (ts.kind != gfc_default_logical_kind)
11440 return SEQ_NONDEFAULT;
11442 return SEQ_NUMERIC;
11445 return SEQ_NONDEFAULT;
11450 /* Resolve derived type EQUIVALENCE object. */
11453 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
11455 gfc_component *c = derived->components;
11460 /* Shall not be an object of nonsequence derived type. */
11461 if (!derived->attr.sequence)
11463 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
11464 "attribute to be an EQUIVALENCE object", sym->name,
11469 /* Shall not have allocatable components. */
11470 if (derived->attr.alloc_comp)
11472 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
11473 "components to be an EQUIVALENCE object",sym->name,
11478 if (sym->attr.in_common && has_default_initializer (sym->ts.u.derived))
11480 gfc_error ("Derived type variable '%s' at %L with default "
11481 "initialization cannot be in EQUIVALENCE with a variable "
11482 "in COMMON", sym->name, &e->where);
11486 for (; c ; c = c->next)
11488 if (c->ts.type == BT_DERIVED
11489 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
11492 /* Shall not be an object of sequence derived type containing a pointer
11493 in the structure. */
11494 if (c->attr.pointer)
11496 gfc_error ("Derived type variable '%s' at %L with pointer "
11497 "component(s) cannot be an EQUIVALENCE object",
11498 sym->name, &e->where);
11506 /* Resolve equivalence object.
11507 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
11508 an allocatable array, an object of nonsequence derived type, an object of
11509 sequence derived type containing a pointer at any level of component
11510 selection, an automatic object, a function name, an entry name, a result
11511 name, a named constant, a structure component, or a subobject of any of
11512 the preceding objects. A substring shall not have length zero. A
11513 derived type shall not have components with default initialization nor
11514 shall two objects of an equivalence group be initialized.
11515 Either all or none of the objects shall have an protected attribute.
11516 The simple constraints are done in symbol.c(check_conflict) and the rest
11517 are implemented here. */
11520 resolve_equivalence (gfc_equiv *eq)
11523 gfc_symbol *first_sym;
11526 locus *last_where = NULL;
11527 seq_type eq_type, last_eq_type;
11528 gfc_typespec *last_ts;
11529 int object, cnt_protected;
11530 const char *value_name;
11534 last_ts = &eq->expr->symtree->n.sym->ts;
11536 first_sym = eq->expr->symtree->n.sym;
11540 for (object = 1; eq; eq = eq->eq, object++)
11544 e->ts = e->symtree->n.sym->ts;
11545 /* match_varspec might not know yet if it is seeing
11546 array reference or substring reference, as it doesn't
11548 if (e->ref && e->ref->type == REF_ARRAY)
11550 gfc_ref *ref = e->ref;
11551 sym = e->symtree->n.sym;
11553 if (sym->attr.dimension)
11555 ref->u.ar.as = sym->as;
11559 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
11560 if (e->ts.type == BT_CHARACTER
11562 && ref->type == REF_ARRAY
11563 && ref->u.ar.dimen == 1
11564 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
11565 && ref->u.ar.stride[0] == NULL)
11567 gfc_expr *start = ref->u.ar.start[0];
11568 gfc_expr *end = ref->u.ar.end[0];
11571 /* Optimize away the (:) reference. */
11572 if (start == NULL && end == NULL)
11575 e->ref = ref->next;
11577 e->ref->next = ref->next;
11582 ref->type = REF_SUBSTRING;
11584 start = gfc_int_expr (1);
11585 ref->u.ss.start = start;
11586 if (end == NULL && e->ts.u.cl)
11587 end = gfc_copy_expr (e->ts.u.cl->length);
11588 ref->u.ss.end = end;
11589 ref->u.ss.length = e->ts.u.cl;
11596 /* Any further ref is an error. */
11599 gcc_assert (ref->type == REF_ARRAY);
11600 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
11606 if (gfc_resolve_expr (e) == FAILURE)
11609 sym = e->symtree->n.sym;
11611 if (sym->attr.is_protected)
11613 if (cnt_protected > 0 && cnt_protected != object)
11615 gfc_error ("Either all or none of the objects in the "
11616 "EQUIVALENCE set at %L shall have the "
11617 "PROTECTED attribute",
11622 /* Shall not equivalence common block variables in a PURE procedure. */
11623 if (sym->ns->proc_name
11624 && sym->ns->proc_name->attr.pure
11625 && sym->attr.in_common)
11627 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
11628 "object in the pure procedure '%s'",
11629 sym->name, &e->where, sym->ns->proc_name->name);
11633 /* Shall not be a named constant. */
11634 if (e->expr_type == EXPR_CONSTANT)
11636 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
11637 "object", sym->name, &e->where);
11641 if (e->ts.type == BT_DERIVED
11642 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
11645 /* Check that the types correspond correctly:
11647 A numeric sequence structure may be equivalenced to another sequence
11648 structure, an object of default integer type, default real type, double
11649 precision real type, default logical type such that components of the
11650 structure ultimately only become associated to objects of the same
11651 kind. A character sequence structure may be equivalenced to an object
11652 of default character kind or another character sequence structure.
11653 Other objects may be equivalenced only to objects of the same type and
11654 kind parameters. */
11656 /* Identical types are unconditionally OK. */
11657 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
11658 goto identical_types;
11660 last_eq_type = sequence_type (*last_ts);
11661 eq_type = sequence_type (sym->ts);
11663 /* Since the pair of objects is not of the same type, mixed or
11664 non-default sequences can be rejected. */
11666 msg = "Sequence %s with mixed components in EQUIVALENCE "
11667 "statement at %L with different type objects";
11669 && last_eq_type == SEQ_MIXED
11670 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
11672 || (eq_type == SEQ_MIXED
11673 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11674 &e->where) == FAILURE))
11677 msg = "Non-default type object or sequence %s in EQUIVALENCE "
11678 "statement at %L with objects of different type";
11680 && last_eq_type == SEQ_NONDEFAULT
11681 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
11682 last_where) == FAILURE)
11683 || (eq_type == SEQ_NONDEFAULT
11684 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11685 &e->where) == FAILURE))
11688 msg ="Non-CHARACTER object '%s' in default CHARACTER "
11689 "EQUIVALENCE statement at %L";
11690 if (last_eq_type == SEQ_CHARACTER
11691 && eq_type != SEQ_CHARACTER
11692 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11693 &e->where) == FAILURE)
11696 msg ="Non-NUMERIC object '%s' in default NUMERIC "
11697 "EQUIVALENCE statement at %L";
11698 if (last_eq_type == SEQ_NUMERIC
11699 && eq_type != SEQ_NUMERIC
11700 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11701 &e->where) == FAILURE)
11706 last_where = &e->where;
11711 /* Shall not be an automatic array. */
11712 if (e->ref->type == REF_ARRAY
11713 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
11715 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
11716 "an EQUIVALENCE object", sym->name, &e->where);
11723 /* Shall not be a structure component. */
11724 if (r->type == REF_COMPONENT)
11726 gfc_error ("Structure component '%s' at %L cannot be an "
11727 "EQUIVALENCE object",
11728 r->u.c.component->name, &e->where);
11732 /* A substring shall not have length zero. */
11733 if (r->type == REF_SUBSTRING)
11735 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
11737 gfc_error ("Substring at %L has length zero",
11738 &r->u.ss.start->where);
11748 /* Resolve function and ENTRY types, issue diagnostics if needed. */
11751 resolve_fntype (gfc_namespace *ns)
11753 gfc_entry_list *el;
11756 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
11759 /* If there are any entries, ns->proc_name is the entry master
11760 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
11762 sym = ns->entries->sym;
11764 sym = ns->proc_name;
11765 if (sym->result == sym
11766 && sym->ts.type == BT_UNKNOWN
11767 && gfc_set_default_type (sym, 0, NULL) == FAILURE
11768 && !sym->attr.untyped)
11770 gfc_error ("Function '%s' at %L has no IMPLICIT type",
11771 sym->name, &sym->declared_at);
11772 sym->attr.untyped = 1;
11775 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
11776 && !sym->attr.contained
11777 && !gfc_check_access (sym->ts.u.derived->attr.access,
11778 sym->ts.u.derived->ns->default_access)
11779 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11781 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
11782 "%L of PRIVATE type '%s'", sym->name,
11783 &sym->declared_at, sym->ts.u.derived->name);
11787 for (el = ns->entries->next; el; el = el->next)
11789 if (el->sym->result == el->sym
11790 && el->sym->ts.type == BT_UNKNOWN
11791 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
11792 && !el->sym->attr.untyped)
11794 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
11795 el->sym->name, &el->sym->declared_at);
11796 el->sym->attr.untyped = 1;
11802 /* 12.3.2.1.1 Defined operators. */
11805 check_uop_procedure (gfc_symbol *sym, locus where)
11807 gfc_formal_arglist *formal;
11809 if (!sym->attr.function)
11811 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
11812 sym->name, &where);
11816 if (sym->ts.type == BT_CHARACTER
11817 && !(sym->ts.u.cl && sym->ts.u.cl->length)
11818 && !(sym->result && sym->result->ts.u.cl
11819 && sym->result->ts.u.cl->length))
11821 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
11822 "character length", sym->name, &where);
11826 formal = sym->formal;
11827 if (!formal || !formal->sym)
11829 gfc_error ("User operator procedure '%s' at %L must have at least "
11830 "one argument", sym->name, &where);
11834 if (formal->sym->attr.intent != INTENT_IN)
11836 gfc_error ("First argument of operator interface at %L must be "
11837 "INTENT(IN)", &where);
11841 if (formal->sym->attr.optional)
11843 gfc_error ("First argument of operator interface at %L cannot be "
11844 "optional", &where);
11848 formal = formal->next;
11849 if (!formal || !formal->sym)
11852 if (formal->sym->attr.intent != INTENT_IN)
11854 gfc_error ("Second argument of operator interface at %L must be "
11855 "INTENT(IN)", &where);
11859 if (formal->sym->attr.optional)
11861 gfc_error ("Second argument of operator interface at %L cannot be "
11862 "optional", &where);
11868 gfc_error ("Operator interface at %L must have, at most, two "
11869 "arguments", &where);
11877 gfc_resolve_uops (gfc_symtree *symtree)
11879 gfc_interface *itr;
11881 if (symtree == NULL)
11884 gfc_resolve_uops (symtree->left);
11885 gfc_resolve_uops (symtree->right);
11887 for (itr = symtree->n.uop->op; itr; itr = itr->next)
11888 check_uop_procedure (itr->sym, itr->sym->declared_at);
11892 /* Examine all of the expressions associated with a program unit,
11893 assign types to all intermediate expressions, make sure that all
11894 assignments are to compatible types and figure out which names
11895 refer to which functions or subroutines. It doesn't check code
11896 block, which is handled by resolve_code. */
11899 resolve_types (gfc_namespace *ns)
11905 gfc_namespace* old_ns = gfc_current_ns;
11907 /* Check that all IMPLICIT types are ok. */
11908 if (!ns->seen_implicit_none)
11911 for (letter = 0; letter != GFC_LETTERS; ++letter)
11912 if (ns->set_flag[letter]
11913 && resolve_typespec_used (&ns->default_type[letter],
11914 &ns->implicit_loc[letter],
11919 gfc_current_ns = ns;
11921 resolve_entries (ns);
11923 resolve_common_vars (ns->blank_common.head, false);
11924 resolve_common_blocks (ns->common_root);
11926 resolve_contained_functions (ns);
11928 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
11930 for (cl = ns->cl_list; cl; cl = cl->next)
11931 resolve_charlen (cl);
11933 gfc_traverse_ns (ns, resolve_symbol);
11935 resolve_fntype (ns);
11937 for (n = ns->contained; n; n = n->sibling)
11939 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
11940 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
11941 "also be PURE", n->proc_name->name,
11942 &n->proc_name->declared_at);
11948 gfc_check_interfaces (ns);
11950 gfc_traverse_ns (ns, resolve_values);
11956 for (d = ns->data; d; d = d->next)
11960 gfc_traverse_ns (ns, gfc_formalize_init_value);
11962 gfc_traverse_ns (ns, gfc_verify_binding_labels);
11964 if (ns->common_root != NULL)
11965 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
11967 for (eq = ns->equiv; eq; eq = eq->next)
11968 resolve_equivalence (eq);
11970 /* Warn about unused labels. */
11971 if (warn_unused_label)
11972 warn_unused_fortran_label (ns->st_labels);
11974 gfc_resolve_uops (ns->uop_root);
11976 gfc_current_ns = old_ns;
11980 /* Call resolve_code recursively. */
11983 resolve_codes (gfc_namespace *ns)
11986 bitmap_obstack old_obstack;
11988 for (n = ns->contained; n; n = n->sibling)
11991 gfc_current_ns = ns;
11993 /* Set to an out of range value. */
11994 current_entry_id = -1;
11996 old_obstack = labels_obstack;
11997 bitmap_obstack_initialize (&labels_obstack);
11999 resolve_code (ns->code, ns);
12001 bitmap_obstack_release (&labels_obstack);
12002 labels_obstack = old_obstack;
12006 /* This function is called after a complete program unit has been compiled.
12007 Its purpose is to examine all of the expressions associated with a program
12008 unit, assign types to all intermediate expressions, make sure that all
12009 assignments are to compatible types and figure out which names refer to
12010 which functions or subroutines. */
12013 gfc_resolve (gfc_namespace *ns)
12015 gfc_namespace *old_ns;
12016 code_stack *old_cs_base;
12022 old_ns = gfc_current_ns;
12023 old_cs_base = cs_base;
12025 resolve_types (ns);
12026 resolve_codes (ns);
12028 gfc_current_ns = old_ns;
12029 cs_base = old_cs_base;