1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
28 #include "arith.h" /* For gfc_compare_expr(). */
29 #include "dependency.h"
31 #include "target-memory.h" /* for gfc_simplify_transfer */
33 /* Types used in equivalence statements. */
37 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
41 /* Stack to keep track of the nesting of blocks as we move through the
42 code. See resolve_branch() and resolve_code(). */
44 typedef struct code_stack
46 struct gfc_code *head, *current;
47 struct code_stack *prev;
49 /* This bitmap keeps track of the targets valid for a branch from
50 inside this block except for END {IF|SELECT}s of enclosing
52 bitmap reachable_labels;
56 static code_stack *cs_base = NULL;
59 /* Nonzero if we're inside a FORALL block. */
61 static int forall_flag;
63 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
65 static int omp_workshare_flag;
67 /* Nonzero if we are processing a formal arglist. The corresponding function
68 resets the flag each time that it is read. */
69 static int formal_arg_flag = 0;
71 /* True if we are resolving a specification expression. */
72 static int specification_expr = 0;
74 /* The id of the last entry seen. */
75 static int current_entry_id;
77 /* We use bitmaps to determine if a branch target is valid. */
78 static bitmap_obstack labels_obstack;
81 gfc_is_formal_arg (void)
83 return formal_arg_flag;
86 /* Is the symbol host associated? */
88 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
90 for (ns = ns->parent; ns; ns = ns->parent)
99 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
100 an ABSTRACT derived-type. If where is not NULL, an error message with that
101 locus is printed, optionally using name. */
104 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
106 if (ts->type == BT_DERIVED && ts->u.derived->attr.abstract)
111 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
112 name, where, ts->u.derived->name);
114 gfc_error ("ABSTRACT type '%s' used at %L",
115 ts->u.derived->name, where);
125 /* Resolve types of formal argument lists. These have to be done early so that
126 the formal argument lists of module procedures can be copied to the
127 containing module before the individual procedures are resolved
128 individually. We also resolve argument lists of procedures in interface
129 blocks because they are self-contained scoping units.
131 Since a dummy argument cannot be a non-dummy procedure, the only
132 resort left for untyped names are the IMPLICIT types. */
135 resolve_formal_arglist (gfc_symbol *proc)
137 gfc_formal_arglist *f;
141 if (proc->result != NULL)
146 if (gfc_elemental (proc)
147 || sym->attr.pointer || sym->attr.allocatable
148 || (sym->as && sym->as->rank > 0))
150 proc->attr.always_explicit = 1;
151 sym->attr.always_explicit = 1;
156 for (f = proc->formal; f; f = f->next)
162 /* Alternate return placeholder. */
163 if (gfc_elemental (proc))
164 gfc_error ("Alternate return specifier in elemental subroutine "
165 "'%s' at %L is not allowed", proc->name,
167 if (proc->attr.function)
168 gfc_error ("Alternate return specifier in function "
169 "'%s' at %L is not allowed", proc->name,
174 if (sym->attr.if_source != IFSRC_UNKNOWN)
175 resolve_formal_arglist (sym);
177 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
179 if (gfc_pure (proc) && !gfc_pure (sym))
181 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
182 "also be PURE", sym->name, &sym->declared_at);
186 if (gfc_elemental (proc))
188 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
189 "procedure", &sym->declared_at);
193 if (sym->attr.function
194 && sym->ts.type == BT_UNKNOWN
195 && sym->attr.intrinsic)
197 gfc_intrinsic_sym *isym;
198 isym = gfc_find_function (sym->name);
199 if (isym == NULL || !isym->specific)
201 gfc_error ("Unable to find a specific INTRINSIC procedure "
202 "for the reference '%s' at %L", sym->name,
211 if (sym->ts.type == BT_UNKNOWN)
213 if (!sym->attr.function || sym->result == sym)
214 gfc_set_default_type (sym, 1, sym->ns);
217 gfc_resolve_array_spec (sym->as, 0);
219 /* We can't tell if an array with dimension (:) is assumed or deferred
220 shape until we know if it has the pointer or allocatable attributes.
222 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
223 && !(sym->attr.pointer || sym->attr.allocatable))
225 sym->as->type = AS_ASSUMED_SHAPE;
226 for (i = 0; i < sym->as->rank; i++)
227 sym->as->lower[i] = gfc_int_expr (1);
230 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
231 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
232 || sym->attr.optional)
234 proc->attr.always_explicit = 1;
236 proc->result->attr.always_explicit = 1;
239 /* If the flavor is unknown at this point, it has to be a variable.
240 A procedure specification would have already set the type. */
242 if (sym->attr.flavor == FL_UNKNOWN)
243 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
245 if (gfc_pure (proc) && !sym->attr.pointer
246 && sym->attr.flavor != FL_PROCEDURE)
248 if (proc->attr.function && sym->attr.intent != INTENT_IN)
249 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
250 "INTENT(IN)", sym->name, proc->name,
253 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
254 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
255 "have its INTENT specified", sym->name, proc->name,
259 if (gfc_elemental (proc))
263 gfc_error ("Argument '%s' of elemental procedure at %L must "
264 "be scalar", sym->name, &sym->declared_at);
268 if (sym->attr.pointer)
270 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
271 "have the POINTER attribute", sym->name,
276 if (sym->attr.flavor == FL_PROCEDURE)
278 gfc_error ("Dummy procedure '%s' not allowed in elemental "
279 "procedure '%s' at %L", sym->name, proc->name,
285 /* Each dummy shall be specified to be scalar. */
286 if (proc->attr.proc == PROC_ST_FUNCTION)
290 gfc_error ("Argument '%s' of statement function at %L must "
291 "be scalar", sym->name, &sym->declared_at);
295 if (sym->ts.type == BT_CHARACTER)
297 gfc_charlen *cl = sym->ts.u.cl;
298 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
300 gfc_error ("Character-valued argument '%s' of statement "
301 "function at %L must have constant length",
302 sym->name, &sym->declared_at);
312 /* Work function called when searching for symbols that have argument lists
313 associated with them. */
316 find_arglists (gfc_symbol *sym)
318 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
321 resolve_formal_arglist (sym);
325 /* Given a namespace, resolve all formal argument lists within the namespace.
329 resolve_formal_arglists (gfc_namespace *ns)
334 gfc_traverse_ns (ns, find_arglists);
339 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
343 /* If this namespace is not a function or an entry master function,
345 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
346 || sym->attr.entry_master)
349 /* Try to find out of what the return type is. */
350 if (sym->result->ts.type == BT_UNKNOWN && sym->result->ts.interface == NULL)
352 t = gfc_set_default_type (sym->result, 0, ns);
354 if (t == FAILURE && !sym->result->attr.untyped)
356 if (sym->result == sym)
357 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
358 sym->name, &sym->declared_at);
359 else if (!sym->result->attr.proc_pointer)
360 gfc_error ("Result '%s' of contained function '%s' at %L has "
361 "no IMPLICIT type", sym->result->name, sym->name,
362 &sym->result->declared_at);
363 sym->result->attr.untyped = 1;
367 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
368 type, lists the only ways a character length value of * can be used:
369 dummy arguments of procedures, named constants, and function results
370 in external functions. Internal function results and results of module
371 procedures are not on this list, ergo, not permitted. */
373 if (sym->result->ts.type == BT_CHARACTER)
375 gfc_charlen *cl = sym->result->ts.u.cl;
376 if (!cl || !cl->length)
378 /* See if this is a module-procedure and adapt error message
381 gcc_assert (ns->parent && ns->parent->proc_name);
382 module_proc = (ns->parent->proc_name->attr.flavor == FL_MODULE);
384 gfc_error ("Character-valued %s '%s' at %L must not be"
386 module_proc ? _("module procedure")
387 : _("internal function"),
388 sym->name, &sym->declared_at);
394 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
395 introduce duplicates. */
398 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
400 gfc_formal_arglist *f, *new_arglist;
403 for (; new_args != NULL; new_args = new_args->next)
405 new_sym = new_args->sym;
406 /* See if this arg is already in the formal argument list. */
407 for (f = proc->formal; f; f = f->next)
409 if (new_sym == f->sym)
416 /* Add a new argument. Argument order is not important. */
417 new_arglist = gfc_get_formal_arglist ();
418 new_arglist->sym = new_sym;
419 new_arglist->next = proc->formal;
420 proc->formal = new_arglist;
425 /* Flag the arguments that are not present in all entries. */
428 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
430 gfc_formal_arglist *f, *head;
433 for (f = proc->formal; f; f = f->next)
438 for (new_args = head; new_args; new_args = new_args->next)
440 if (new_args->sym == f->sym)
447 f->sym->attr.not_always_present = 1;
452 /* Resolve alternate entry points. If a symbol has multiple entry points we
453 create a new master symbol for the main routine, and turn the existing
454 symbol into an entry point. */
457 resolve_entries (gfc_namespace *ns)
459 gfc_namespace *old_ns;
463 char name[GFC_MAX_SYMBOL_LEN + 1];
464 static int master_count = 0;
466 if (ns->proc_name == NULL)
469 /* No need to do anything if this procedure doesn't have alternate entry
474 /* We may already have resolved alternate entry points. */
475 if (ns->proc_name->attr.entry_master)
478 /* If this isn't a procedure something has gone horribly wrong. */
479 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
481 /* Remember the current namespace. */
482 old_ns = gfc_current_ns;
486 /* Add the main entry point to the list of entry points. */
487 el = gfc_get_entry_list ();
488 el->sym = ns->proc_name;
490 el->next = ns->entries;
492 ns->proc_name->attr.entry = 1;
494 /* If it is a module function, it needs to be in the right namespace
495 so that gfc_get_fake_result_decl can gather up the results. The
496 need for this arose in get_proc_name, where these beasts were
497 left in their own namespace, to keep prior references linked to
498 the entry declaration.*/
499 if (ns->proc_name->attr.function
500 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
503 /* Do the same for entries where the master is not a module
504 procedure. These are retained in the module namespace because
505 of the module procedure declaration. */
506 for (el = el->next; el; el = el->next)
507 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
508 && el->sym->attr.mod_proc)
512 /* Add an entry statement for it. */
519 /* Create a new symbol for the master function. */
520 /* Give the internal function a unique name (within this file).
521 Also include the function name so the user has some hope of figuring
522 out what is going on. */
523 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
524 master_count++, ns->proc_name->name);
525 gfc_get_ha_symbol (name, &proc);
526 gcc_assert (proc != NULL);
528 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
529 if (ns->proc_name->attr.subroutine)
530 gfc_add_subroutine (&proc->attr, proc->name, NULL);
534 gfc_typespec *ts, *fts;
535 gfc_array_spec *as, *fas;
536 gfc_add_function (&proc->attr, proc->name, NULL);
538 fas = ns->entries->sym->as;
539 fas = fas ? fas : ns->entries->sym->result->as;
540 fts = &ns->entries->sym->result->ts;
541 if (fts->type == BT_UNKNOWN)
542 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
543 for (el = ns->entries->next; el; el = el->next)
545 ts = &el->sym->result->ts;
547 as = as ? as : el->sym->result->as;
548 if (ts->type == BT_UNKNOWN)
549 ts = gfc_get_default_type (el->sym->result->name, NULL);
551 if (! gfc_compare_types (ts, fts)
552 || (el->sym->result->attr.dimension
553 != ns->entries->sym->result->attr.dimension)
554 || (el->sym->result->attr.pointer
555 != ns->entries->sym->result->attr.pointer))
557 else if (as && fas && ns->entries->sym->result != el->sym->result
558 && gfc_compare_array_spec (as, fas) == 0)
559 gfc_error ("Function %s at %L has entries with mismatched "
560 "array specifications", ns->entries->sym->name,
561 &ns->entries->sym->declared_at);
562 /* The characteristics need to match and thus both need to have
563 the same string length, i.e. both len=*, or both len=4.
564 Having both len=<variable> is also possible, but difficult to
565 check at compile time. */
566 else if (ts->type == BT_CHARACTER && ts->u.cl && fts->u.cl
567 && (((ts->u.cl->length && !fts->u.cl->length)
568 ||(!ts->u.cl->length && fts->u.cl->length))
570 && ts->u.cl->length->expr_type
571 != fts->u.cl->length->expr_type)
573 && ts->u.cl->length->expr_type == EXPR_CONSTANT
574 && mpz_cmp (ts->u.cl->length->value.integer,
575 fts->u.cl->length->value.integer) != 0)))
576 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
577 "entries returning variables of different "
578 "string lengths", ns->entries->sym->name,
579 &ns->entries->sym->declared_at);
584 sym = ns->entries->sym->result;
585 /* All result types the same. */
587 if (sym->attr.dimension)
588 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
589 if (sym->attr.pointer)
590 gfc_add_pointer (&proc->attr, NULL);
594 /* Otherwise the result will be passed through a union by
596 proc->attr.mixed_entry_master = 1;
597 for (el = ns->entries; el; el = el->next)
599 sym = el->sym->result;
600 if (sym->attr.dimension)
602 if (el == ns->entries)
603 gfc_error ("FUNCTION result %s can't be an array in "
604 "FUNCTION %s at %L", sym->name,
605 ns->entries->sym->name, &sym->declared_at);
607 gfc_error ("ENTRY result %s can't be an array in "
608 "FUNCTION %s at %L", sym->name,
609 ns->entries->sym->name, &sym->declared_at);
611 else if (sym->attr.pointer)
613 if (el == ns->entries)
614 gfc_error ("FUNCTION result %s can't be a POINTER in "
615 "FUNCTION %s at %L", sym->name,
616 ns->entries->sym->name, &sym->declared_at);
618 gfc_error ("ENTRY result %s can't be a POINTER in "
619 "FUNCTION %s at %L", sym->name,
620 ns->entries->sym->name, &sym->declared_at);
625 if (ts->type == BT_UNKNOWN)
626 ts = gfc_get_default_type (sym->name, NULL);
630 if (ts->kind == gfc_default_integer_kind)
634 if (ts->kind == gfc_default_real_kind
635 || ts->kind == gfc_default_double_kind)
639 if (ts->kind == gfc_default_complex_kind)
643 if (ts->kind == gfc_default_logical_kind)
647 /* We will issue error elsewhere. */
655 if (el == ns->entries)
656 gfc_error ("FUNCTION result %s can't be of type %s "
657 "in FUNCTION %s at %L", sym->name,
658 gfc_typename (ts), ns->entries->sym->name,
661 gfc_error ("ENTRY result %s can't be of type %s "
662 "in FUNCTION %s at %L", sym->name,
663 gfc_typename (ts), ns->entries->sym->name,
670 proc->attr.access = ACCESS_PRIVATE;
671 proc->attr.entry_master = 1;
673 /* Merge all the entry point arguments. */
674 for (el = ns->entries; el; el = el->next)
675 merge_argument_lists (proc, el->sym->formal);
677 /* Check the master formal arguments for any that are not
678 present in all entry points. */
679 for (el = ns->entries; el; el = el->next)
680 check_argument_lists (proc, el->sym->formal);
682 /* Use the master function for the function body. */
683 ns->proc_name = proc;
685 /* Finalize the new symbols. */
686 gfc_commit_symbols ();
688 /* Restore the original namespace. */
689 gfc_current_ns = old_ns;
694 has_default_initializer (gfc_symbol *der)
698 gcc_assert (der->attr.flavor == FL_DERIVED);
699 for (c = der->components; c; c = c->next)
700 if ((c->ts.type != BT_DERIVED && c->initializer)
701 || (c->ts.type == BT_DERIVED
702 && (!c->attr.pointer && has_default_initializer (c->ts.u.derived))))
708 /* Resolve common variables. */
710 resolve_common_vars (gfc_symbol *sym, bool named_common)
712 gfc_symbol *csym = sym;
714 for (; csym; csym = csym->common_next)
716 if (csym->value || csym->attr.data)
718 if (!csym->ns->is_block_data)
719 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
720 "but only in BLOCK DATA initialization is "
721 "allowed", csym->name, &csym->declared_at);
722 else if (!named_common)
723 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
724 "in a blank COMMON but initialization is only "
725 "allowed in named common blocks", csym->name,
729 if (csym->ts.type != BT_DERIVED)
732 if (!(csym->ts.u.derived->attr.sequence
733 || csym->ts.u.derived->attr.is_bind_c))
734 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
735 "has neither the SEQUENCE nor the BIND(C) "
736 "attribute", csym->name, &csym->declared_at);
737 if (csym->ts.u.derived->attr.alloc_comp)
738 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
739 "has an ultimate component that is "
740 "allocatable", csym->name, &csym->declared_at);
741 if (has_default_initializer (csym->ts.u.derived))
742 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
743 "may not have default initializer", csym->name,
746 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
747 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
751 /* Resolve common blocks. */
753 resolve_common_blocks (gfc_symtree *common_root)
757 if (common_root == NULL)
760 if (common_root->left)
761 resolve_common_blocks (common_root->left);
762 if (common_root->right)
763 resolve_common_blocks (common_root->right);
765 resolve_common_vars (common_root->n.common->head, true);
767 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
771 if (sym->attr.flavor == FL_PARAMETER)
772 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
773 sym->name, &common_root->n.common->where, &sym->declared_at);
775 if (sym->attr.intrinsic)
776 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
777 sym->name, &common_root->n.common->where);
778 else if (sym->attr.result
779 ||(sym->attr.function && gfc_current_ns->proc_name == sym))
780 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
781 "that is also a function result", sym->name,
782 &common_root->n.common->where);
783 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
784 && sym->attr.proc != PROC_ST_FUNCTION)
785 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
786 "that is also a global procedure", sym->name,
787 &common_root->n.common->where);
791 /* Resolve contained function types. Because contained functions can call one
792 another, they have to be worked out before any of the contained procedures
795 The good news is that if a function doesn't already have a type, the only
796 way it can get one is through an IMPLICIT type or a RESULT variable, because
797 by definition contained functions are contained namespace they're contained
798 in, not in a sibling or parent namespace. */
801 resolve_contained_functions (gfc_namespace *ns)
803 gfc_namespace *child;
806 resolve_formal_arglists (ns);
808 for (child = ns->contained; child; child = child->sibling)
810 /* Resolve alternate entry points first. */
811 resolve_entries (child);
813 /* Then check function return types. */
814 resolve_contained_fntype (child->proc_name, child);
815 for (el = child->entries; el; el = el->next)
816 resolve_contained_fntype (el->sym, child);
821 /* Resolve all of the elements of a structure constructor and make sure that
822 the types are correct. */
825 resolve_structure_cons (gfc_expr *expr)
827 gfc_constructor *cons;
833 cons = expr->value.constructor;
834 /* A constructor may have references if it is the result of substituting a
835 parameter variable. In this case we just pull out the component we
838 comp = expr->ref->u.c.sym->components;
840 comp = expr->ts.u.derived->components;
842 /* See if the user is trying to invoke a structure constructor for one of
843 the iso_c_binding derived types. */
844 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
845 && expr->ts.u.derived->ts.is_iso_c && cons && cons->expr != NULL)
847 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
848 expr->ts.u.derived->name, &(expr->where));
852 for (; comp; comp = comp->next, cons = cons->next)
859 if (gfc_resolve_expr (cons->expr) == FAILURE)
865 rank = comp->as ? comp->as->rank : 0;
866 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
867 && (comp->attr.allocatable || cons->expr->rank))
869 gfc_error ("The rank of the element in the derived type "
870 "constructor at %L does not match that of the "
871 "component (%d/%d)", &cons->expr->where,
872 cons->expr->rank, rank);
876 /* If we don't have the right type, try to convert it. */
878 if (!gfc_compare_types (&cons->expr->ts, &comp->ts))
881 if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
882 gfc_error ("The element in the derived type constructor at %L, "
883 "for pointer component '%s', is %s but should be %s",
884 &cons->expr->where, comp->name,
885 gfc_basic_typename (cons->expr->ts.type),
886 gfc_basic_typename (comp->ts.type));
888 t = gfc_convert_type (cons->expr, &comp->ts, 1);
891 if (cons->expr->expr_type == EXPR_NULL
892 && !(comp->attr.pointer || comp->attr.allocatable
893 || comp->attr.proc_pointer
894 || (comp->ts.type == BT_CLASS
895 && (comp->ts.u.derived->components->attr.pointer
896 || comp->ts.u.derived->components->attr.allocatable))))
899 gfc_error ("The NULL in the derived type constructor at %L is "
900 "being applied to component '%s', which is neither "
901 "a POINTER nor ALLOCATABLE", &cons->expr->where,
905 if (!comp->attr.pointer || cons->expr->expr_type == EXPR_NULL)
908 a = gfc_expr_attr (cons->expr);
910 if (!a.pointer && !a.target)
913 gfc_error ("The element in the derived type constructor at %L, "
914 "for pointer component '%s' should be a POINTER or "
915 "a TARGET", &cons->expr->where, comp->name);
923 /****************** Expression name resolution ******************/
925 /* Returns 0 if a symbol was not declared with a type or
926 attribute declaration statement, nonzero otherwise. */
929 was_declared (gfc_symbol *sym)
935 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
938 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
939 || a.optional || a.pointer || a.save || a.target || a.volatile_
940 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN)
947 /* Determine if a symbol is generic or not. */
950 generic_sym (gfc_symbol *sym)
954 if (sym->attr.generic ||
955 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
958 if (was_declared (sym) || sym->ns->parent == NULL)
961 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
968 return generic_sym (s);
975 /* Determine if a symbol is specific or not. */
978 specific_sym (gfc_symbol *sym)
982 if (sym->attr.if_source == IFSRC_IFBODY
983 || sym->attr.proc == PROC_MODULE
984 || sym->attr.proc == PROC_INTERNAL
985 || sym->attr.proc == PROC_ST_FUNCTION
986 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
987 || sym->attr.external)
990 if (was_declared (sym) || sym->ns->parent == NULL)
993 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
995 return (s == NULL) ? 0 : specific_sym (s);
999 /* Figure out if the procedure is specific, generic or unknown. */
1002 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1006 procedure_kind (gfc_symbol *sym)
1008 if (generic_sym (sym))
1009 return PTYPE_GENERIC;
1011 if (specific_sym (sym))
1012 return PTYPE_SPECIFIC;
1014 return PTYPE_UNKNOWN;
1017 /* Check references to assumed size arrays. The flag need_full_assumed_size
1018 is nonzero when matching actual arguments. */
1020 static int need_full_assumed_size = 0;
1023 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1025 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1028 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1029 What should it be? */
1030 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1031 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1032 && (e->ref->u.ar.type == AR_FULL))
1034 gfc_error ("The upper bound in the last dimension must "
1035 "appear in the reference to the assumed size "
1036 "array '%s' at %L", sym->name, &e->where);
1043 /* Look for bad assumed size array references in argument expressions
1044 of elemental and array valued intrinsic procedures. Since this is
1045 called from procedure resolution functions, it only recurses at
1049 resolve_assumed_size_actual (gfc_expr *e)
1054 switch (e->expr_type)
1057 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1062 if (resolve_assumed_size_actual (e->value.op.op1)
1063 || resolve_assumed_size_actual (e->value.op.op2))
1074 /* Check a generic procedure, passed as an actual argument, to see if
1075 there is a matching specific name. If none, it is an error, and if
1076 more than one, the reference is ambiguous. */
1078 count_specific_procs (gfc_expr *e)
1085 sym = e->symtree->n.sym;
1087 for (p = sym->generic; p; p = p->next)
1088 if (strcmp (sym->name, p->sym->name) == 0)
1090 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1096 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1100 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1101 "argument at %L", sym->name, &e->where);
1107 /* See if a call to sym could possibly be a not allowed RECURSION because of
1108 a missing RECURIVE declaration. This means that either sym is the current
1109 context itself, or sym is the parent of a contained procedure calling its
1110 non-RECURSIVE containing procedure.
1111 This also works if sym is an ENTRY. */
1114 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1116 gfc_symbol* proc_sym;
1117 gfc_symbol* context_proc;
1118 gfc_namespace* real_context;
1120 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1122 /* If we've got an ENTRY, find real procedure. */
1123 if (sym->attr.entry && sym->ns->entries)
1124 proc_sym = sym->ns->entries->sym;
1128 /* If sym is RECURSIVE, all is well of course. */
1129 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1132 /* Find the context procedure's "real" symbol if it has entries.
1133 We look for a procedure symbol, so recurse on the parents if we don't
1134 find one (like in case of a BLOCK construct). */
1135 for (real_context = context; ; real_context = real_context->parent)
1137 /* We should find something, eventually! */
1138 gcc_assert (real_context);
1140 context_proc = (real_context->entries ? real_context->entries->sym
1141 : real_context->proc_name);
1143 /* In some special cases, there may not be a proc_name, like for this
1145 real(bad_kind()) function foo () ...
1146 when checking the call to bad_kind ().
1147 In these cases, we simply return here and assume that the
1152 if (context_proc->attr.flavor != FL_LABEL)
1156 /* A call from sym's body to itself is recursion, of course. */
1157 if (context_proc == proc_sym)
1160 /* The same is true if context is a contained procedure and sym the
1162 if (context_proc->attr.contained)
1164 gfc_symbol* parent_proc;
1166 gcc_assert (context->parent);
1167 parent_proc = (context->parent->entries ? context->parent->entries->sym
1168 : context->parent->proc_name);
1170 if (parent_proc == proc_sym)
1178 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1179 its typespec and formal argument list. */
1182 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1184 gfc_intrinsic_sym* isym;
1190 /* We already know this one is an intrinsic, so we don't call
1191 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1192 gfc_find_subroutine directly to check whether it is a function or
1195 if ((isym = gfc_find_function (sym->name)))
1197 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1198 && !sym->attr.implicit_type)
1199 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1200 " ignored", sym->name, &sym->declared_at);
1202 if (!sym->attr.function &&
1203 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1208 else if ((isym = gfc_find_subroutine (sym->name)))
1210 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1212 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1213 " specifier", sym->name, &sym->declared_at);
1217 if (!sym->attr.subroutine &&
1218 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1223 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1228 gfc_copy_formal_args_intr (sym, isym);
1230 /* Check it is actually available in the standard settings. */
1231 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1234 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1235 " available in the current standard settings but %s. Use"
1236 " an appropriate -std=* option or enable -fall-intrinsics"
1237 " in order to use it.",
1238 sym->name, &sym->declared_at, symstd);
1246 /* Resolve a procedure expression, like passing it to a called procedure or as
1247 RHS for a procedure pointer assignment. */
1250 resolve_procedure_expression (gfc_expr* expr)
1254 if (expr->expr_type != EXPR_VARIABLE)
1256 gcc_assert (expr->symtree);
1258 sym = expr->symtree->n.sym;
1260 if (sym->attr.intrinsic)
1261 resolve_intrinsic (sym, &expr->where);
1263 if (sym->attr.flavor != FL_PROCEDURE
1264 || (sym->attr.function && sym->result == sym))
1267 /* A non-RECURSIVE procedure that is used as procedure expression within its
1268 own body is in danger of being called recursively. */
1269 if (is_illegal_recursion (sym, gfc_current_ns))
1270 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1271 " itself recursively. Declare it RECURSIVE or use"
1272 " -frecursive", sym->name, &expr->where);
1278 /* Resolve an actual argument list. Most of the time, this is just
1279 resolving the expressions in the list.
1280 The exception is that we sometimes have to decide whether arguments
1281 that look like procedure arguments are really simple variable
1285 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1286 bool no_formal_args)
1289 gfc_symtree *parent_st;
1291 int save_need_full_assumed_size;
1292 gfc_component *comp;
1294 for (; arg; arg = arg->next)
1299 /* Check the label is a valid branching target. */
1302 if (arg->label->defined == ST_LABEL_UNKNOWN)
1304 gfc_error ("Label %d referenced at %L is never defined",
1305 arg->label->value, &arg->label->where);
1312 if (gfc_is_proc_ptr_comp (e, &comp))
1315 if (e->expr_type == EXPR_PPC)
1317 if (comp->as != NULL)
1318 e->rank = comp->as->rank;
1319 e->expr_type = EXPR_FUNCTION;
1324 if (e->expr_type == EXPR_VARIABLE
1325 && e->symtree->n.sym->attr.generic
1327 && count_specific_procs (e) != 1)
1330 if (e->ts.type != BT_PROCEDURE)
1332 save_need_full_assumed_size = need_full_assumed_size;
1333 if (e->expr_type != EXPR_VARIABLE)
1334 need_full_assumed_size = 0;
1335 if (gfc_resolve_expr (e) != SUCCESS)
1337 need_full_assumed_size = save_need_full_assumed_size;
1341 /* See if the expression node should really be a variable reference. */
1343 sym = e->symtree->n.sym;
1345 if (sym->attr.flavor == FL_PROCEDURE
1346 || sym->attr.intrinsic
1347 || sym->attr.external)
1351 /* If a procedure is not already determined to be something else
1352 check if it is intrinsic. */
1353 if (!sym->attr.intrinsic
1354 && !(sym->attr.external || sym->attr.use_assoc
1355 || sym->attr.if_source == IFSRC_IFBODY)
1356 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1357 sym->attr.intrinsic = 1;
1359 if (sym->attr.proc == PROC_ST_FUNCTION)
1361 gfc_error ("Statement function '%s' at %L is not allowed as an "
1362 "actual argument", sym->name, &e->where);
1365 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1366 sym->attr.subroutine);
1367 if (sym->attr.intrinsic && actual_ok == 0)
1369 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1370 "actual argument", sym->name, &e->where);
1373 if (sym->attr.contained && !sym->attr.use_assoc
1374 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1376 gfc_error ("Internal procedure '%s' is not allowed as an "
1377 "actual argument at %L", sym->name, &e->where);
1380 if (sym->attr.elemental && !sym->attr.intrinsic)
1382 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1383 "allowed as an actual argument at %L", sym->name,
1387 /* Check if a generic interface has a specific procedure
1388 with the same name before emitting an error. */
1389 if (sym->attr.generic && count_specific_procs (e) != 1)
1392 /* Just in case a specific was found for the expression. */
1393 sym = e->symtree->n.sym;
1395 /* If the symbol is the function that names the current (or
1396 parent) scope, then we really have a variable reference. */
1398 if (sym->attr.function && sym->result == sym
1399 && (sym->ns->proc_name == sym
1400 || (sym->ns->parent != NULL
1401 && sym->ns->parent->proc_name == sym)))
1404 /* If all else fails, see if we have a specific intrinsic. */
1405 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1407 gfc_intrinsic_sym *isym;
1409 isym = gfc_find_function (sym->name);
1410 if (isym == NULL || !isym->specific)
1412 gfc_error ("Unable to find a specific INTRINSIC procedure "
1413 "for the reference '%s' at %L", sym->name,
1418 sym->attr.intrinsic = 1;
1419 sym->attr.function = 1;
1422 if (gfc_resolve_expr (e) == FAILURE)
1427 /* See if the name is a module procedure in a parent unit. */
1429 if (was_declared (sym) || sym->ns->parent == NULL)
1432 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1434 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1438 if (parent_st == NULL)
1441 sym = parent_st->n.sym;
1442 e->symtree = parent_st; /* Point to the right thing. */
1444 if (sym->attr.flavor == FL_PROCEDURE
1445 || sym->attr.intrinsic
1446 || sym->attr.external)
1448 if (gfc_resolve_expr (e) == FAILURE)
1454 e->expr_type = EXPR_VARIABLE;
1456 if (sym->as != NULL)
1458 e->rank = sym->as->rank;
1459 e->ref = gfc_get_ref ();
1460 e->ref->type = REF_ARRAY;
1461 e->ref->u.ar.type = AR_FULL;
1462 e->ref->u.ar.as = sym->as;
1465 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1466 primary.c (match_actual_arg). If above code determines that it
1467 is a variable instead, it needs to be resolved as it was not
1468 done at the beginning of this function. */
1469 save_need_full_assumed_size = need_full_assumed_size;
1470 if (e->expr_type != EXPR_VARIABLE)
1471 need_full_assumed_size = 0;
1472 if (gfc_resolve_expr (e) != SUCCESS)
1474 need_full_assumed_size = save_need_full_assumed_size;
1477 /* Check argument list functions %VAL, %LOC and %REF. There is
1478 nothing to do for %REF. */
1479 if (arg->name && arg->name[0] == '%')
1481 if (strncmp ("%VAL", arg->name, 4) == 0)
1483 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1485 gfc_error ("By-value argument at %L is not of numeric "
1492 gfc_error ("By-value argument at %L cannot be an array or "
1493 "an array section", &e->where);
1497 /* Intrinsics are still PROC_UNKNOWN here. However,
1498 since same file external procedures are not resolvable
1499 in gfortran, it is a good deal easier to leave them to
1501 if (ptype != PROC_UNKNOWN
1502 && ptype != PROC_DUMMY
1503 && ptype != PROC_EXTERNAL
1504 && ptype != PROC_MODULE)
1506 gfc_error ("By-value argument at %L is not allowed "
1507 "in this context", &e->where);
1512 /* Statement functions have already been excluded above. */
1513 else if (strncmp ("%LOC", arg->name, 4) == 0
1514 && e->ts.type == BT_PROCEDURE)
1516 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1518 gfc_error ("Passing internal procedure at %L by location "
1519 "not allowed", &e->where);
1530 /* Do the checks of the actual argument list that are specific to elemental
1531 procedures. If called with c == NULL, we have a function, otherwise if
1532 expr == NULL, we have a subroutine. */
1535 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1537 gfc_actual_arglist *arg0;
1538 gfc_actual_arglist *arg;
1539 gfc_symbol *esym = NULL;
1540 gfc_intrinsic_sym *isym = NULL;
1542 gfc_intrinsic_arg *iformal = NULL;
1543 gfc_formal_arglist *eformal = NULL;
1544 bool formal_optional = false;
1545 bool set_by_optional = false;
1549 /* Is this an elemental procedure? */
1550 if (expr && expr->value.function.actual != NULL)
1552 if (expr->value.function.esym != NULL
1553 && expr->value.function.esym->attr.elemental)
1555 arg0 = expr->value.function.actual;
1556 esym = expr->value.function.esym;
1558 else if (expr->value.function.isym != NULL
1559 && expr->value.function.isym->elemental)
1561 arg0 = expr->value.function.actual;
1562 isym = expr->value.function.isym;
1567 else if (c && c->ext.actual != NULL)
1569 arg0 = c->ext.actual;
1571 if (c->resolved_sym)
1572 esym = c->resolved_sym;
1574 esym = c->symtree->n.sym;
1577 if (!esym->attr.elemental)
1583 /* The rank of an elemental is the rank of its array argument(s). */
1584 for (arg = arg0; arg; arg = arg->next)
1586 if (arg->expr != NULL && arg->expr->rank > 0)
1588 rank = arg->expr->rank;
1589 if (arg->expr->expr_type == EXPR_VARIABLE
1590 && arg->expr->symtree->n.sym->attr.optional)
1591 set_by_optional = true;
1593 /* Function specific; set the result rank and shape. */
1597 if (!expr->shape && arg->expr->shape)
1599 expr->shape = gfc_get_shape (rank);
1600 for (i = 0; i < rank; i++)
1601 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1608 /* If it is an array, it shall not be supplied as an actual argument
1609 to an elemental procedure unless an array of the same rank is supplied
1610 as an actual argument corresponding to a nonoptional dummy argument of
1611 that elemental procedure(12.4.1.5). */
1612 formal_optional = false;
1614 iformal = isym->formal;
1616 eformal = esym->formal;
1618 for (arg = arg0; arg; arg = arg->next)
1622 if (eformal->sym && eformal->sym->attr.optional)
1623 formal_optional = true;
1624 eformal = eformal->next;
1626 else if (isym && iformal)
1628 if (iformal->optional)
1629 formal_optional = true;
1630 iformal = iformal->next;
1633 formal_optional = true;
1635 if (pedantic && arg->expr != NULL
1636 && arg->expr->expr_type == EXPR_VARIABLE
1637 && arg->expr->symtree->n.sym->attr.optional
1640 && (set_by_optional || arg->expr->rank != rank)
1641 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1643 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1644 "MISSING, it cannot be the actual argument of an "
1645 "ELEMENTAL procedure unless there is a non-optional "
1646 "argument with the same rank (12.4.1.5)",
1647 arg->expr->symtree->n.sym->name, &arg->expr->where);
1652 for (arg = arg0; arg; arg = arg->next)
1654 if (arg->expr == NULL || arg->expr->rank == 0)
1657 /* Being elemental, the last upper bound of an assumed size array
1658 argument must be present. */
1659 if (resolve_assumed_size_actual (arg->expr))
1662 /* Elemental procedure's array actual arguments must conform. */
1665 if (gfc_check_conformance (arg->expr, e,
1666 "elemental procedure") == FAILURE)
1673 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1674 is an array, the intent inout/out variable needs to be also an array. */
1675 if (rank > 0 && esym && expr == NULL)
1676 for (eformal = esym->formal, arg = arg0; arg && eformal;
1677 arg = arg->next, eformal = eformal->next)
1678 if ((eformal->sym->attr.intent == INTENT_OUT
1679 || eformal->sym->attr.intent == INTENT_INOUT)
1680 && arg->expr && arg->expr->rank == 0)
1682 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1683 "ELEMENTAL subroutine '%s' is a scalar, but another "
1684 "actual argument is an array", &arg->expr->where,
1685 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1686 : "INOUT", eformal->sym->name, esym->name);
1693 /* Go through each actual argument in ACTUAL and see if it can be
1694 implemented as an inlined, non-copying intrinsic. FNSYM is the
1695 function being called, or NULL if not known. */
1698 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1700 gfc_actual_arglist *ap;
1703 for (ap = actual; ap; ap = ap->next)
1705 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1706 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1708 ap->expr->inline_noncopying_intrinsic = 1;
1712 /* This function does the checking of references to global procedures
1713 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1714 77 and 95 standards. It checks for a gsymbol for the name, making
1715 one if it does not already exist. If it already exists, then the
1716 reference being resolved must correspond to the type of gsymbol.
1717 Otherwise, the new symbol is equipped with the attributes of the
1718 reference. The corresponding code that is called in creating
1719 global entities is parse.c.
1721 In addition, for all but -std=legacy, the gsymbols are used to
1722 check the interfaces of external procedures from the same file.
1723 The namespace of the gsymbol is resolved and then, once this is
1724 done the interface is checked. */
1728 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1730 if (!gsym_ns->proc_name->attr.recursive)
1733 if (sym->ns == gsym_ns)
1736 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1743 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1745 if (gsym_ns->entries)
1747 gfc_entry_list *entry = gsym_ns->entries;
1749 for (; entry; entry = entry->next)
1751 if (strcmp (sym->name, entry->sym->name) == 0)
1753 if (strcmp (gsym_ns->proc_name->name,
1754 sym->ns->proc_name->name) == 0)
1758 && strcmp (gsym_ns->proc_name->name,
1759 sym->ns->parent->proc_name->name) == 0)
1768 resolve_global_procedure (gfc_symbol *sym, locus *where,
1769 gfc_actual_arglist **actual, int sub)
1773 enum gfc_symbol_type type;
1775 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1777 gsym = gfc_get_gsymbol (sym->name);
1779 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1780 gfc_global_used (gsym, where);
1782 if (gfc_option.flag_whole_file
1783 && sym->attr.if_source == IFSRC_UNKNOWN
1784 && gsym->type != GSYM_UNKNOWN
1786 && gsym->ns->resolved != -1
1787 && gsym->ns->proc_name
1788 && not_in_recursive (sym, gsym->ns)
1789 && not_entry_self_reference (sym, gsym->ns))
1791 /* Make sure that translation for the gsymbol occurs before
1792 the procedure currently being resolved. */
1793 ns = gsym->ns->resolved ? NULL : gfc_global_ns_list;
1794 for (; ns && ns != gsym->ns; ns = ns->sibling)
1796 if (ns->sibling == gsym->ns)
1798 ns->sibling = gsym->ns->sibling;
1799 gsym->ns->sibling = gfc_global_ns_list;
1800 gfc_global_ns_list = gsym->ns;
1805 if (!gsym->ns->resolved)
1807 gfc_dt_list *old_dt_list;
1809 /* Stash away derived types so that the backend_decls do not
1811 old_dt_list = gfc_derived_types;
1812 gfc_derived_types = NULL;
1814 gfc_resolve (gsym->ns);
1816 /* Store the new derived types with the global namespace. */
1817 if (gfc_derived_types)
1818 gsym->ns->derived_types = gfc_derived_types;
1820 /* Restore the derived types of this namespace. */
1821 gfc_derived_types = old_dt_list;
1824 if (gsym->ns->proc_name->attr.function
1825 && gsym->ns->proc_name->as
1826 && gsym->ns->proc_name->as->rank
1827 && (!sym->as || sym->as->rank != gsym->ns->proc_name->as->rank))
1828 gfc_error ("The reference to function '%s' at %L either needs an "
1829 "explicit INTERFACE or the rank is incorrect", sym->name,
1832 if (gfc_option.flag_whole_file == 1
1833 || ((gfc_option.warn_std & GFC_STD_LEGACY)
1835 !(gfc_option.warn_std & GFC_STD_GNU)))
1836 gfc_errors_to_warnings (1);
1838 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1840 gfc_errors_to_warnings (0);
1843 if (gsym->type == GSYM_UNKNOWN)
1846 gsym->where = *where;
1853 /************* Function resolution *************/
1855 /* Resolve a function call known to be generic.
1856 Section 14.1.2.4.1. */
1859 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1863 if (sym->attr.generic)
1865 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1868 expr->value.function.name = s->name;
1869 expr->value.function.esym = s;
1871 if (s->ts.type != BT_UNKNOWN)
1873 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1874 expr->ts = s->result->ts;
1877 expr->rank = s->as->rank;
1878 else if (s->result != NULL && s->result->as != NULL)
1879 expr->rank = s->result->as->rank;
1881 gfc_set_sym_referenced (expr->value.function.esym);
1886 /* TODO: Need to search for elemental references in generic
1890 if (sym->attr.intrinsic)
1891 return gfc_intrinsic_func_interface (expr, 0);
1898 resolve_generic_f (gfc_expr *expr)
1903 sym = expr->symtree->n.sym;
1907 m = resolve_generic_f0 (expr, sym);
1910 else if (m == MATCH_ERROR)
1914 if (sym->ns->parent == NULL)
1916 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1920 if (!generic_sym (sym))
1924 /* Last ditch attempt. See if the reference is to an intrinsic
1925 that possesses a matching interface. 14.1.2.4 */
1926 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
1928 gfc_error ("There is no specific function for the generic '%s' at %L",
1929 expr->symtree->n.sym->name, &expr->where);
1933 m = gfc_intrinsic_func_interface (expr, 0);
1937 gfc_error ("Generic function '%s' at %L is not consistent with a "
1938 "specific intrinsic interface", expr->symtree->n.sym->name,
1945 /* Resolve a function call known to be specific. */
1948 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
1952 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
1954 if (sym->attr.dummy)
1956 sym->attr.proc = PROC_DUMMY;
1960 sym->attr.proc = PROC_EXTERNAL;
1964 if (sym->attr.proc == PROC_MODULE
1965 || sym->attr.proc == PROC_ST_FUNCTION
1966 || sym->attr.proc == PROC_INTERNAL)
1969 if (sym->attr.intrinsic)
1971 m = gfc_intrinsic_func_interface (expr, 1);
1975 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
1976 "with an intrinsic", sym->name, &expr->where);
1984 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1987 expr->ts = sym->result->ts;
1990 expr->value.function.name = sym->name;
1991 expr->value.function.esym = sym;
1992 if (sym->as != NULL)
1993 expr->rank = sym->as->rank;
2000 resolve_specific_f (gfc_expr *expr)
2005 sym = expr->symtree->n.sym;
2009 m = resolve_specific_f0 (sym, expr);
2012 if (m == MATCH_ERROR)
2015 if (sym->ns->parent == NULL)
2018 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2024 gfc_error ("Unable to resolve the specific function '%s' at %L",
2025 expr->symtree->n.sym->name, &expr->where);
2031 /* Resolve a procedure call not known to be generic nor specific. */
2034 resolve_unknown_f (gfc_expr *expr)
2039 sym = expr->symtree->n.sym;
2041 if (sym->attr.dummy)
2043 sym->attr.proc = PROC_DUMMY;
2044 expr->value.function.name = sym->name;
2048 /* See if we have an intrinsic function reference. */
2050 if (gfc_is_intrinsic (sym, 0, expr->where))
2052 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2057 /* The reference is to an external name. */
2059 sym->attr.proc = PROC_EXTERNAL;
2060 expr->value.function.name = sym->name;
2061 expr->value.function.esym = expr->symtree->n.sym;
2063 if (sym->as != NULL)
2064 expr->rank = sym->as->rank;
2066 /* Type of the expression is either the type of the symbol or the
2067 default type of the symbol. */
2070 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2072 if (sym->ts.type != BT_UNKNOWN)
2076 ts = gfc_get_default_type (sym->name, sym->ns);
2078 if (ts->type == BT_UNKNOWN)
2080 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2081 sym->name, &expr->where);
2092 /* Return true, if the symbol is an external procedure. */
2094 is_external_proc (gfc_symbol *sym)
2096 if (!sym->attr.dummy && !sym->attr.contained
2097 && !(sym->attr.intrinsic
2098 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2099 && sym->attr.proc != PROC_ST_FUNCTION
2100 && !sym->attr.use_assoc
2108 /* Figure out if a function reference is pure or not. Also set the name
2109 of the function for a potential error message. Return nonzero if the
2110 function is PURE, zero if not. */
2112 pure_stmt_function (gfc_expr *, gfc_symbol *);
2115 pure_function (gfc_expr *e, const char **name)
2121 if (e->symtree != NULL
2122 && e->symtree->n.sym != NULL
2123 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2124 return pure_stmt_function (e, e->symtree->n.sym);
2126 if (e->value.function.esym)
2128 pure = gfc_pure (e->value.function.esym);
2129 *name = e->value.function.esym->name;
2131 else if (e->value.function.isym)
2133 pure = e->value.function.isym->pure
2134 || e->value.function.isym->elemental;
2135 *name = e->value.function.isym->name;
2139 /* Implicit functions are not pure. */
2141 *name = e->value.function.name;
2149 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2150 int *f ATTRIBUTE_UNUSED)
2154 /* Don't bother recursing into other statement functions
2155 since they will be checked individually for purity. */
2156 if (e->expr_type != EXPR_FUNCTION
2158 || e->symtree->n.sym == sym
2159 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2162 return pure_function (e, &name) ? false : true;
2167 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2169 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2174 is_scalar_expr_ptr (gfc_expr *expr)
2176 gfc_try retval = SUCCESS;
2181 /* See if we have a gfc_ref, which means we have a substring, array
2182 reference, or a component. */
2183 if (expr->ref != NULL)
2186 while (ref->next != NULL)
2192 if (ref->u.ss.length != NULL
2193 && ref->u.ss.length->length != NULL
2195 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2197 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2199 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2200 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2201 if (end - start + 1 != 1)
2208 if (ref->u.ar.type == AR_ELEMENT)
2210 else if (ref->u.ar.type == AR_FULL)
2212 /* The user can give a full array if the array is of size 1. */
2213 if (ref->u.ar.as != NULL
2214 && ref->u.ar.as->rank == 1
2215 && ref->u.ar.as->type == AS_EXPLICIT
2216 && ref->u.ar.as->lower[0] != NULL
2217 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2218 && ref->u.ar.as->upper[0] != NULL
2219 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2221 /* If we have a character string, we need to check if
2222 its length is one. */
2223 if (expr->ts.type == BT_CHARACTER)
2225 if (expr->ts.u.cl == NULL
2226 || expr->ts.u.cl->length == NULL
2227 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2233 /* We have constant lower and upper bounds. If the
2234 difference between is 1, it can be considered a
2236 start = (int) mpz_get_si
2237 (ref->u.ar.as->lower[0]->value.integer);
2238 end = (int) mpz_get_si
2239 (ref->u.ar.as->upper[0]->value.integer);
2240 if (end - start + 1 != 1)
2255 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2257 /* Character string. Make sure it's of length 1. */
2258 if (expr->ts.u.cl == NULL
2259 || expr->ts.u.cl->length == NULL
2260 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2263 else if (expr->rank != 0)
2270 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2271 and, in the case of c_associated, set the binding label based on
2275 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2276 gfc_symbol **new_sym)
2278 char name[GFC_MAX_SYMBOL_LEN + 1];
2279 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2280 int optional_arg = 0, is_pointer = 0;
2281 gfc_try retval = SUCCESS;
2282 gfc_symbol *args_sym;
2283 gfc_typespec *arg_ts;
2285 if (args->expr->expr_type == EXPR_CONSTANT
2286 || args->expr->expr_type == EXPR_OP
2287 || args->expr->expr_type == EXPR_NULL)
2289 gfc_error ("Argument to '%s' at %L is not a variable",
2290 sym->name, &(args->expr->where));
2294 args_sym = args->expr->symtree->n.sym;
2296 /* The typespec for the actual arg should be that stored in the expr
2297 and not necessarily that of the expr symbol (args_sym), because
2298 the actual expression could be a part-ref of the expr symbol. */
2299 arg_ts = &(args->expr->ts);
2301 is_pointer = gfc_is_data_pointer (args->expr);
2303 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2305 /* If the user gave two args then they are providing something for
2306 the optional arg (the second cptr). Therefore, set the name and
2307 binding label to the c_associated for two cptrs. Otherwise,
2308 set c_associated to expect one cptr. */
2312 sprintf (name, "%s_2", sym->name);
2313 sprintf (binding_label, "%s_2", sym->binding_label);
2319 sprintf (name, "%s_1", sym->name);
2320 sprintf (binding_label, "%s_1", sym->binding_label);
2324 /* Get a new symbol for the version of c_associated that
2326 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2328 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2329 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2331 sprintf (name, "%s", sym->name);
2332 sprintf (binding_label, "%s", sym->binding_label);
2334 /* Error check the call. */
2335 if (args->next != NULL)
2337 gfc_error_now ("More actual than formal arguments in '%s' "
2338 "call at %L", name, &(args->expr->where));
2341 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2343 /* Make sure we have either the target or pointer attribute. */
2344 if (!args_sym->attr.target && !is_pointer)
2346 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2347 "a TARGET or an associated pointer",
2349 sym->name, &(args->expr->where));
2353 /* See if we have interoperable type and type param. */
2354 if (verify_c_interop (arg_ts) == SUCCESS
2355 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2357 if (args_sym->attr.target == 1)
2359 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2360 has the target attribute and is interoperable. */
2361 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2362 allocatable variable that has the TARGET attribute and
2363 is not an array of zero size. */
2364 if (args_sym->attr.allocatable == 1)
2366 if (args_sym->attr.dimension != 0
2367 && (args_sym->as && args_sym->as->rank == 0))
2369 gfc_error_now ("Allocatable variable '%s' used as a "
2370 "parameter to '%s' at %L must not be "
2371 "an array of zero size",
2372 args_sym->name, sym->name,
2373 &(args->expr->where));
2379 /* A non-allocatable target variable with C
2380 interoperable type and type parameters must be
2382 if (args_sym && args_sym->attr.dimension)
2384 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2386 gfc_error ("Assumed-shape array '%s' at %L "
2387 "cannot be an argument to the "
2388 "procedure '%s' because "
2389 "it is not C interoperable",
2391 &(args->expr->where), sym->name);
2394 else if (args_sym->as->type == AS_DEFERRED)
2396 gfc_error ("Deferred-shape array '%s' at %L "
2397 "cannot be an argument to the "
2398 "procedure '%s' because "
2399 "it is not C interoperable",
2401 &(args->expr->where), sym->name);
2406 /* Make sure it's not a character string. Arrays of
2407 any type should be ok if the variable is of a C
2408 interoperable type. */
2409 if (arg_ts->type == BT_CHARACTER)
2410 if (arg_ts->u.cl != NULL
2411 && (arg_ts->u.cl->length == NULL
2412 || arg_ts->u.cl->length->expr_type
2415 (arg_ts->u.cl->length->value.integer, 1)
2417 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2419 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2420 "at %L must have a length of 1",
2421 args_sym->name, sym->name,
2422 &(args->expr->where));
2428 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2430 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2432 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2433 "associated scalar POINTER", args_sym->name,
2434 sym->name, &(args->expr->where));
2440 /* The parameter is not required to be C interoperable. If it
2441 is not C interoperable, it must be a nonpolymorphic scalar
2442 with no length type parameters. It still must have either
2443 the pointer or target attribute, and it can be
2444 allocatable (but must be allocated when c_loc is called). */
2445 if (args->expr->rank != 0
2446 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2448 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2449 "scalar", args_sym->name, sym->name,
2450 &(args->expr->where));
2453 else if (arg_ts->type == BT_CHARACTER
2454 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2456 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2457 "%L must have a length of 1",
2458 args_sym->name, sym->name,
2459 &(args->expr->where));
2464 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2466 if (args_sym->attr.flavor != FL_PROCEDURE)
2468 /* TODO: Update this error message to allow for procedure
2469 pointers once they are implemented. */
2470 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2472 args_sym->name, sym->name,
2473 &(args->expr->where));
2476 else if (args_sym->attr.is_bind_c != 1)
2478 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2480 args_sym->name, sym->name,
2481 &(args->expr->where));
2486 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2491 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2492 "iso_c_binding function: '%s'!\n", sym->name);
2499 /* Resolve a function call, which means resolving the arguments, then figuring
2500 out which entity the name refers to. */
2501 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2502 to INTENT(OUT) or INTENT(INOUT). */
2505 resolve_function (gfc_expr *expr)
2507 gfc_actual_arglist *arg;
2512 procedure_type p = PROC_INTRINSIC;
2513 bool no_formal_args;
2517 sym = expr->symtree->n.sym;
2519 if (sym && sym->attr.intrinsic
2520 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2523 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2525 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2529 if (sym && sym->attr.abstract)
2531 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2532 sym->name, &expr->where);
2536 /* Switch off assumed size checking and do this again for certain kinds
2537 of procedure, once the procedure itself is resolved. */
2538 need_full_assumed_size++;
2540 if (expr->symtree && expr->symtree->n.sym)
2541 p = expr->symtree->n.sym->attr.proc;
2543 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2544 if (resolve_actual_arglist (expr->value.function.actual,
2545 p, no_formal_args) == FAILURE)
2548 /* Need to setup the call to the correct c_associated, depending on
2549 the number of cptrs to user gives to compare. */
2550 if (sym && sym->attr.is_iso_c == 1)
2552 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2556 /* Get the symtree for the new symbol (resolved func).
2557 the old one will be freed later, when it's no longer used. */
2558 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2561 /* Resume assumed_size checking. */
2562 need_full_assumed_size--;
2564 /* If the procedure is external, check for usage. */
2565 if (sym && is_external_proc (sym))
2566 resolve_global_procedure (sym, &expr->where,
2567 &expr->value.function.actual, 0);
2569 if (sym && sym->ts.type == BT_CHARACTER
2571 && sym->ts.u.cl->length == NULL
2573 && expr->value.function.esym == NULL
2574 && !sym->attr.contained)
2576 /* Internal procedures are taken care of in resolve_contained_fntype. */
2577 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2578 "be used at %L since it is not a dummy argument",
2579 sym->name, &expr->where);
2583 /* See if function is already resolved. */
2585 if (expr->value.function.name != NULL)
2587 if (expr->ts.type == BT_UNKNOWN)
2593 /* Apply the rules of section 14.1.2. */
2595 switch (procedure_kind (sym))
2598 t = resolve_generic_f (expr);
2601 case PTYPE_SPECIFIC:
2602 t = resolve_specific_f (expr);
2606 t = resolve_unknown_f (expr);
2610 gfc_internal_error ("resolve_function(): bad function type");
2614 /* If the expression is still a function (it might have simplified),
2615 then we check to see if we are calling an elemental function. */
2617 if (expr->expr_type != EXPR_FUNCTION)
2620 temp = need_full_assumed_size;
2621 need_full_assumed_size = 0;
2623 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2626 if (omp_workshare_flag
2627 && expr->value.function.esym
2628 && ! gfc_elemental (expr->value.function.esym))
2630 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2631 "in WORKSHARE construct", expr->value.function.esym->name,
2636 #define GENERIC_ID expr->value.function.isym->id
2637 else if (expr->value.function.actual != NULL
2638 && expr->value.function.isym != NULL
2639 && GENERIC_ID != GFC_ISYM_LBOUND
2640 && GENERIC_ID != GFC_ISYM_LEN
2641 && GENERIC_ID != GFC_ISYM_LOC
2642 && GENERIC_ID != GFC_ISYM_PRESENT)
2644 /* Array intrinsics must also have the last upper bound of an
2645 assumed size array argument. UBOUND and SIZE have to be
2646 excluded from the check if the second argument is anything
2649 for (arg = expr->value.function.actual; arg; arg = arg->next)
2651 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2652 && arg->next != NULL && arg->next->expr)
2654 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2657 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2660 if ((int)mpz_get_si (arg->next->expr->value.integer)
2665 if (arg->expr != NULL
2666 && arg->expr->rank > 0
2667 && resolve_assumed_size_actual (arg->expr))
2673 need_full_assumed_size = temp;
2676 if (!pure_function (expr, &name) && name)
2680 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2681 "FORALL %s", name, &expr->where,
2682 forall_flag == 2 ? "mask" : "block");
2685 else if (gfc_pure (NULL))
2687 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2688 "procedure within a PURE procedure", name, &expr->where);
2693 /* Functions without the RECURSIVE attribution are not allowed to
2694 * call themselves. */
2695 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2698 esym = expr->value.function.esym;
2700 if (is_illegal_recursion (esym, gfc_current_ns))
2702 if (esym->attr.entry && esym->ns->entries)
2703 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2704 " function '%s' is not RECURSIVE",
2705 esym->name, &expr->where, esym->ns->entries->sym->name);
2707 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2708 " is not RECURSIVE", esym->name, &expr->where);
2714 /* Character lengths of use associated functions may contains references to
2715 symbols not referenced from the current program unit otherwise. Make sure
2716 those symbols are marked as referenced. */
2718 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2719 && expr->value.function.esym->attr.use_assoc)
2721 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
2725 && !((expr->value.function.esym
2726 && expr->value.function.esym->attr.elemental)
2728 (expr->value.function.isym
2729 && expr->value.function.isym->elemental)))
2730 find_noncopying_intrinsics (expr->value.function.esym,
2731 expr->value.function.actual);
2733 /* Make sure that the expression has a typespec that works. */
2734 if (expr->ts.type == BT_UNKNOWN)
2736 if (expr->symtree->n.sym->result
2737 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2738 && !expr->symtree->n.sym->result->attr.proc_pointer)
2739 expr->ts = expr->symtree->n.sym->result->ts;
2746 /************* Subroutine resolution *************/
2749 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2755 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2756 sym->name, &c->loc);
2757 else if (gfc_pure (NULL))
2758 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2764 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2768 if (sym->attr.generic)
2770 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2773 c->resolved_sym = s;
2774 pure_subroutine (c, s);
2778 /* TODO: Need to search for elemental references in generic interface. */
2781 if (sym->attr.intrinsic)
2782 return gfc_intrinsic_sub_interface (c, 0);
2789 resolve_generic_s (gfc_code *c)
2794 sym = c->symtree->n.sym;
2798 m = resolve_generic_s0 (c, sym);
2801 else if (m == MATCH_ERROR)
2805 if (sym->ns->parent == NULL)
2807 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2811 if (!generic_sym (sym))
2815 /* Last ditch attempt. See if the reference is to an intrinsic
2816 that possesses a matching interface. 14.1.2.4 */
2817 sym = c->symtree->n.sym;
2819 if (!gfc_is_intrinsic (sym, 1, c->loc))
2821 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2822 sym->name, &c->loc);
2826 m = gfc_intrinsic_sub_interface (c, 0);
2830 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2831 "intrinsic subroutine interface", sym->name, &c->loc);
2837 /* Set the name and binding label of the subroutine symbol in the call
2838 expression represented by 'c' to include the type and kind of the
2839 second parameter. This function is for resolving the appropriate
2840 version of c_f_pointer() and c_f_procpointer(). For example, a
2841 call to c_f_pointer() for a default integer pointer could have a
2842 name of c_f_pointer_i4. If no second arg exists, which is an error
2843 for these two functions, it defaults to the generic symbol's name
2844 and binding label. */
2847 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2848 char *name, char *binding_label)
2850 gfc_expr *arg = NULL;
2854 /* The second arg of c_f_pointer and c_f_procpointer determines
2855 the type and kind for the procedure name. */
2856 arg = c->ext.actual->next->expr;
2860 /* Set up the name to have the given symbol's name,
2861 plus the type and kind. */
2862 /* a derived type is marked with the type letter 'u' */
2863 if (arg->ts.type == BT_DERIVED)
2866 kind = 0; /* set the kind as 0 for now */
2870 type = gfc_type_letter (arg->ts.type);
2871 kind = arg->ts.kind;
2874 if (arg->ts.type == BT_CHARACTER)
2875 /* Kind info for character strings not needed. */
2878 sprintf (name, "%s_%c%d", sym->name, type, kind);
2879 /* Set up the binding label as the given symbol's label plus
2880 the type and kind. */
2881 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2885 /* If the second arg is missing, set the name and label as
2886 was, cause it should at least be found, and the missing
2887 arg error will be caught by compare_parameters(). */
2888 sprintf (name, "%s", sym->name);
2889 sprintf (binding_label, "%s", sym->binding_label);
2896 /* Resolve a generic version of the iso_c_binding procedure given
2897 (sym) to the specific one based on the type and kind of the
2898 argument(s). Currently, this function resolves c_f_pointer() and
2899 c_f_procpointer based on the type and kind of the second argument
2900 (FPTR). Other iso_c_binding procedures aren't specially handled.
2901 Upon successfully exiting, c->resolved_sym will hold the resolved
2902 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2906 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2908 gfc_symbol *new_sym;
2909 /* this is fine, since we know the names won't use the max */
2910 char name[GFC_MAX_SYMBOL_LEN + 1];
2911 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2912 /* default to success; will override if find error */
2913 match m = MATCH_YES;
2915 /* Make sure the actual arguments are in the necessary order (based on the
2916 formal args) before resolving. */
2917 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2919 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2920 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2922 set_name_and_label (c, sym, name, binding_label);
2924 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2926 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
2928 /* Make sure we got a third arg if the second arg has non-zero
2929 rank. We must also check that the type and rank are
2930 correct since we short-circuit this check in
2931 gfc_procedure_use() (called above to sort actual args). */
2932 if (c->ext.actual->next->expr->rank != 0)
2934 if(c->ext.actual->next->next == NULL
2935 || c->ext.actual->next->next->expr == NULL)
2938 gfc_error ("Missing SHAPE parameter for call to %s "
2939 "at %L", sym->name, &(c->loc));
2941 else if (c->ext.actual->next->next->expr->ts.type
2943 || c->ext.actual->next->next->expr->rank != 1)
2946 gfc_error ("SHAPE parameter for call to %s at %L must "
2947 "be a rank 1 INTEGER array", sym->name,
2954 if (m != MATCH_ERROR)
2956 /* the 1 means to add the optional arg to formal list */
2957 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
2959 /* for error reporting, say it's declared where the original was */
2960 new_sym->declared_at = sym->declared_at;
2965 /* no differences for c_loc or c_funloc */
2969 /* set the resolved symbol */
2970 if (m != MATCH_ERROR)
2971 c->resolved_sym = new_sym;
2973 c->resolved_sym = sym;
2979 /* Resolve a subroutine call known to be specific. */
2982 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
2986 if(sym->attr.is_iso_c)
2988 m = gfc_iso_c_sub_interface (c,sym);
2992 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2994 if (sym->attr.dummy)
2996 sym->attr.proc = PROC_DUMMY;
3000 sym->attr.proc = PROC_EXTERNAL;
3004 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3007 if (sym->attr.intrinsic)
3009 m = gfc_intrinsic_sub_interface (c, 1);
3013 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3014 "with an intrinsic", sym->name, &c->loc);
3022 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3024 c->resolved_sym = sym;
3025 pure_subroutine (c, sym);
3032 resolve_specific_s (gfc_code *c)
3037 sym = c->symtree->n.sym;
3041 m = resolve_specific_s0 (c, sym);
3044 if (m == MATCH_ERROR)
3047 if (sym->ns->parent == NULL)
3050 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3056 sym = c->symtree->n.sym;
3057 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3058 sym->name, &c->loc);
3064 /* Resolve a subroutine call not known to be generic nor specific. */
3067 resolve_unknown_s (gfc_code *c)
3071 sym = c->symtree->n.sym;
3073 if (sym->attr.dummy)
3075 sym->attr.proc = PROC_DUMMY;
3079 /* See if we have an intrinsic function reference. */
3081 if (gfc_is_intrinsic (sym, 1, c->loc))
3083 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3088 /* The reference is to an external name. */
3091 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3093 c->resolved_sym = sym;
3095 pure_subroutine (c, sym);
3101 /* Resolve a subroutine call. Although it was tempting to use the same code
3102 for functions, subroutines and functions are stored differently and this
3103 makes things awkward. */
3106 resolve_call (gfc_code *c)
3109 procedure_type ptype = PROC_INTRINSIC;
3110 gfc_symbol *csym, *sym;
3111 bool no_formal_args;
3113 csym = c->symtree ? c->symtree->n.sym : NULL;
3115 if (csym && csym->ts.type != BT_UNKNOWN)
3117 gfc_error ("'%s' at %L has a type, which is not consistent with "
3118 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3122 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3125 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3126 sym = st ? st->n.sym : NULL;
3127 if (sym && csym != sym
3128 && sym->ns == gfc_current_ns
3129 && sym->attr.flavor == FL_PROCEDURE
3130 && sym->attr.contained)
3133 if (csym->attr.generic)
3134 c->symtree->n.sym = sym;
3137 csym = c->symtree->n.sym;
3141 /* Subroutines without the RECURSIVE attribution are not allowed to
3142 * call themselves. */
3143 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3145 if (csym->attr.entry && csym->ns->entries)
3146 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3147 " subroutine '%s' is not RECURSIVE",
3148 csym->name, &c->loc, csym->ns->entries->sym->name);
3150 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3151 " is not RECURSIVE", csym->name, &c->loc);
3156 /* Switch off assumed size checking and do this again for certain kinds
3157 of procedure, once the procedure itself is resolved. */
3158 need_full_assumed_size++;
3161 ptype = csym->attr.proc;
3163 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3164 if (resolve_actual_arglist (c->ext.actual, ptype,
3165 no_formal_args) == FAILURE)
3168 /* Resume assumed_size checking. */
3169 need_full_assumed_size--;
3171 /* If external, check for usage. */
3172 if (csym && is_external_proc (csym))
3173 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3176 if (c->resolved_sym == NULL)
3178 c->resolved_isym = NULL;
3179 switch (procedure_kind (csym))
3182 t = resolve_generic_s (c);
3185 case PTYPE_SPECIFIC:
3186 t = resolve_specific_s (c);
3190 t = resolve_unknown_s (c);
3194 gfc_internal_error ("resolve_subroutine(): bad function type");
3198 /* Some checks of elemental subroutine actual arguments. */
3199 if (resolve_elemental_actual (NULL, c) == FAILURE)
3202 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3203 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3208 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3209 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3210 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3211 if their shapes do not match. If either op1->shape or op2->shape is
3212 NULL, return SUCCESS. */
3215 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3222 if (op1->shape != NULL && op2->shape != NULL)
3224 for (i = 0; i < op1->rank; i++)
3226 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3228 gfc_error ("Shapes for operands at %L and %L are not conformable",
3229 &op1->where, &op2->where);
3240 /* Resolve an operator expression node. This can involve replacing the
3241 operation with a user defined function call. */
3244 resolve_operator (gfc_expr *e)
3246 gfc_expr *op1, *op2;
3248 bool dual_locus_error;
3251 /* Resolve all subnodes-- give them types. */
3253 switch (e->value.op.op)
3256 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3259 /* Fall through... */
3262 case INTRINSIC_UPLUS:
3263 case INTRINSIC_UMINUS:
3264 case INTRINSIC_PARENTHESES:
3265 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3270 /* Typecheck the new node. */
3272 op1 = e->value.op.op1;
3273 op2 = e->value.op.op2;
3274 dual_locus_error = false;
3276 if ((op1 && op1->expr_type == EXPR_NULL)
3277 || (op2 && op2->expr_type == EXPR_NULL))
3279 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3283 switch (e->value.op.op)
3285 case INTRINSIC_UPLUS:
3286 case INTRINSIC_UMINUS:
3287 if (op1->ts.type == BT_INTEGER
3288 || op1->ts.type == BT_REAL
3289 || op1->ts.type == BT_COMPLEX)
3295 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3296 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3299 case INTRINSIC_PLUS:
3300 case INTRINSIC_MINUS:
3301 case INTRINSIC_TIMES:
3302 case INTRINSIC_DIVIDE:
3303 case INTRINSIC_POWER:
3304 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3306 gfc_type_convert_binary (e);
3311 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3312 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3313 gfc_typename (&op2->ts));
3316 case INTRINSIC_CONCAT:
3317 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3318 && op1->ts.kind == op2->ts.kind)
3320 e->ts.type = BT_CHARACTER;
3321 e->ts.kind = op1->ts.kind;
3326 _("Operands of string concatenation operator at %%L are %s/%s"),
3327 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3333 case INTRINSIC_NEQV:
3334 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3336 e->ts.type = BT_LOGICAL;
3337 e->ts.kind = gfc_kind_max (op1, op2);
3338 if (op1->ts.kind < e->ts.kind)
3339 gfc_convert_type (op1, &e->ts, 2);
3340 else if (op2->ts.kind < e->ts.kind)
3341 gfc_convert_type (op2, &e->ts, 2);
3345 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3346 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3347 gfc_typename (&op2->ts));
3352 if (op1->ts.type == BT_LOGICAL)
3354 e->ts.type = BT_LOGICAL;
3355 e->ts.kind = op1->ts.kind;
3359 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3360 gfc_typename (&op1->ts));
3364 case INTRINSIC_GT_OS:
3366 case INTRINSIC_GE_OS:
3368 case INTRINSIC_LT_OS:
3370 case INTRINSIC_LE_OS:
3371 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3373 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3377 /* Fall through... */
3380 case INTRINSIC_EQ_OS:
3382 case INTRINSIC_NE_OS:
3383 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3384 && op1->ts.kind == op2->ts.kind)
3386 e->ts.type = BT_LOGICAL;
3387 e->ts.kind = gfc_default_logical_kind;
3391 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3393 gfc_type_convert_binary (e);
3395 e->ts.type = BT_LOGICAL;
3396 e->ts.kind = gfc_default_logical_kind;
3400 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3402 _("Logicals at %%L must be compared with %s instead of %s"),
3403 (e->value.op.op == INTRINSIC_EQ
3404 || e->value.op.op == INTRINSIC_EQ_OS)
3405 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3408 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3409 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3410 gfc_typename (&op2->ts));
3414 case INTRINSIC_USER:
3415 if (e->value.op.uop->op == NULL)
3416 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3417 else if (op2 == NULL)
3418 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3419 e->value.op.uop->name, gfc_typename (&op1->ts));
3421 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3422 e->value.op.uop->name, gfc_typename (&op1->ts),
3423 gfc_typename (&op2->ts));
3427 case INTRINSIC_PARENTHESES:
3429 if (e->ts.type == BT_CHARACTER)
3430 e->ts.u.cl = op1->ts.u.cl;
3434 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3437 /* Deal with arrayness of an operand through an operator. */
3441 switch (e->value.op.op)
3443 case INTRINSIC_PLUS:
3444 case INTRINSIC_MINUS:
3445 case INTRINSIC_TIMES:
3446 case INTRINSIC_DIVIDE:
3447 case INTRINSIC_POWER:
3448 case INTRINSIC_CONCAT:
3452 case INTRINSIC_NEQV:
3454 case INTRINSIC_EQ_OS:
3456 case INTRINSIC_NE_OS:
3458 case INTRINSIC_GT_OS:
3460 case INTRINSIC_GE_OS:
3462 case INTRINSIC_LT_OS:
3464 case INTRINSIC_LE_OS:
3466 if (op1->rank == 0 && op2->rank == 0)
3469 if (op1->rank == 0 && op2->rank != 0)
3471 e->rank = op2->rank;
3473 if (e->shape == NULL)
3474 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3477 if (op1->rank != 0 && op2->rank == 0)
3479 e->rank = op1->rank;
3481 if (e->shape == NULL)
3482 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3485 if (op1->rank != 0 && op2->rank != 0)
3487 if (op1->rank == op2->rank)
3489 e->rank = op1->rank;
3490 if (e->shape == NULL)
3492 t = compare_shapes(op1, op2);
3496 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3501 /* Allow higher level expressions to work. */
3504 /* Try user-defined operators, and otherwise throw an error. */
3505 dual_locus_error = true;
3507 _("Inconsistent ranks for operator at %%L and %%L"));
3514 case INTRINSIC_PARENTHESES:
3516 case INTRINSIC_UPLUS:
3517 case INTRINSIC_UMINUS:
3518 /* Simply copy arrayness attribute */
3519 e->rank = op1->rank;
3521 if (e->shape == NULL)
3522 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3530 /* Attempt to simplify the expression. */
3533 t = gfc_simplify_expr (e, 0);
3534 /* Some calls do not succeed in simplification and return FAILURE
3535 even though there is no error; e.g. variable references to
3536 PARAMETER arrays. */
3537 if (!gfc_is_constant_expr (e))
3546 if (gfc_extend_expr (e, &real_error) == SUCCESS)
3553 if (dual_locus_error)
3554 gfc_error (msg, &op1->where, &op2->where);
3556 gfc_error (msg, &e->where);
3562 /************** Array resolution subroutines **************/
3565 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3568 /* Compare two integer expressions. */
3571 compare_bound (gfc_expr *a, gfc_expr *b)
3575 if (a == NULL || a->expr_type != EXPR_CONSTANT
3576 || b == NULL || b->expr_type != EXPR_CONSTANT)
3579 /* If either of the types isn't INTEGER, we must have
3580 raised an error earlier. */
3582 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3585 i = mpz_cmp (a->value.integer, b->value.integer);
3595 /* Compare an integer expression with an integer. */
3598 compare_bound_int (gfc_expr *a, int b)
3602 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3605 if (a->ts.type != BT_INTEGER)
3606 gfc_internal_error ("compare_bound_int(): Bad expression");
3608 i = mpz_cmp_si (a->value.integer, b);
3618 /* Compare an integer expression with a mpz_t. */
3621 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3625 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3628 if (a->ts.type != BT_INTEGER)
3629 gfc_internal_error ("compare_bound_int(): Bad expression");
3631 i = mpz_cmp (a->value.integer, b);
3641 /* Compute the last value of a sequence given by a triplet.
3642 Return 0 if it wasn't able to compute the last value, or if the
3643 sequence if empty, and 1 otherwise. */
3646 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3647 gfc_expr *stride, mpz_t last)
3651 if (start == NULL || start->expr_type != EXPR_CONSTANT
3652 || end == NULL || end->expr_type != EXPR_CONSTANT
3653 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3656 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3657 || (stride != NULL && stride->ts.type != BT_INTEGER))
3660 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3662 if (compare_bound (start, end) == CMP_GT)
3664 mpz_set (last, end->value.integer);
3668 if (compare_bound_int (stride, 0) == CMP_GT)
3670 /* Stride is positive */
3671 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3676 /* Stride is negative */
3677 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3682 mpz_sub (rem, end->value.integer, start->value.integer);
3683 mpz_tdiv_r (rem, rem, stride->value.integer);
3684 mpz_sub (last, end->value.integer, rem);
3691 /* Compare a single dimension of an array reference to the array
3695 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3699 /* Given start, end and stride values, calculate the minimum and
3700 maximum referenced indexes. */
3702 switch (ar->dimen_type[i])
3708 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3710 gfc_warning ("Array reference at %L is out of bounds "
3711 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3712 mpz_get_si (ar->start[i]->value.integer),
3713 mpz_get_si (as->lower[i]->value.integer), i+1);
3716 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3718 gfc_warning ("Array reference at %L is out of bounds "
3719 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3720 mpz_get_si (ar->start[i]->value.integer),
3721 mpz_get_si (as->upper[i]->value.integer), i+1);
3729 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3730 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3732 comparison comp_start_end = compare_bound (AR_START, AR_END);
3734 /* Check for zero stride, which is not allowed. */
3735 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3737 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3741 /* if start == len || (stride > 0 && start < len)
3742 || (stride < 0 && start > len),
3743 then the array section contains at least one element. In this
3744 case, there is an out-of-bounds access if
3745 (start < lower || start > upper). */
3746 if (compare_bound (AR_START, AR_END) == CMP_EQ
3747 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3748 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3749 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3750 && comp_start_end == CMP_GT))
3752 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3754 gfc_warning ("Lower array reference at %L is out of bounds "
3755 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3756 mpz_get_si (AR_START->value.integer),
3757 mpz_get_si (as->lower[i]->value.integer), i+1);
3760 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3762 gfc_warning ("Lower array reference at %L is out of bounds "
3763 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3764 mpz_get_si (AR_START->value.integer),
3765 mpz_get_si (as->upper[i]->value.integer), i+1);
3770 /* If we can compute the highest index of the array section,
3771 then it also has to be between lower and upper. */
3772 mpz_init (last_value);
3773 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3776 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3778 gfc_warning ("Upper array reference at %L is out of bounds "
3779 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3780 mpz_get_si (last_value),
3781 mpz_get_si (as->lower[i]->value.integer), i+1);
3782 mpz_clear (last_value);
3785 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3787 gfc_warning ("Upper array reference at %L is out of bounds "
3788 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3789 mpz_get_si (last_value),
3790 mpz_get_si (as->upper[i]->value.integer), i+1);
3791 mpz_clear (last_value);
3795 mpz_clear (last_value);
3803 gfc_internal_error ("check_dimension(): Bad array reference");
3810 /* Compare an array reference with an array specification. */
3813 compare_spec_to_ref (gfc_array_ref *ar)
3820 /* TODO: Full array sections are only allowed as actual parameters. */
3821 if (as->type == AS_ASSUMED_SIZE
3822 && (/*ar->type == AR_FULL
3823 ||*/ (ar->type == AR_SECTION
3824 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3826 gfc_error ("Rightmost upper bound of assumed size array section "
3827 "not specified at %L", &ar->where);
3831 if (ar->type == AR_FULL)
3834 if (as->rank != ar->dimen)
3836 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3837 &ar->where, ar->dimen, as->rank);
3841 for (i = 0; i < as->rank; i++)
3842 if (check_dimension (i, ar, as) == FAILURE)
3849 /* Resolve one part of an array index. */
3852 gfc_resolve_index (gfc_expr *index, int check_scalar)
3859 if (gfc_resolve_expr (index) == FAILURE)
3862 if (check_scalar && index->rank != 0)
3864 gfc_error ("Array index at %L must be scalar", &index->where);
3868 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
3870 gfc_error ("Array index at %L must be of INTEGER type, found %s",
3871 &index->where, gfc_basic_typename (index->ts.type));
3875 if (index->ts.type == BT_REAL)
3876 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
3877 &index->where) == FAILURE)
3880 if (index->ts.kind != gfc_index_integer_kind
3881 || index->ts.type != BT_INTEGER)
3884 ts.type = BT_INTEGER;
3885 ts.kind = gfc_index_integer_kind;
3887 gfc_convert_type_warn (index, &ts, 2, 0);
3893 /* Resolve a dim argument to an intrinsic function. */
3896 gfc_resolve_dim_arg (gfc_expr *dim)
3901 if (gfc_resolve_expr (dim) == FAILURE)
3906 gfc_error ("Argument dim at %L must be scalar", &dim->where);
3911 if (dim->ts.type != BT_INTEGER)
3913 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
3917 if (dim->ts.kind != gfc_index_integer_kind)
3921 ts.type = BT_INTEGER;
3922 ts.kind = gfc_index_integer_kind;
3924 gfc_convert_type_warn (dim, &ts, 2, 0);
3930 /* Given an expression that contains array references, update those array
3931 references to point to the right array specifications. While this is
3932 filled in during matching, this information is difficult to save and load
3933 in a module, so we take care of it here.
3935 The idea here is that the original array reference comes from the
3936 base symbol. We traverse the list of reference structures, setting
3937 the stored reference to references. Component references can
3938 provide an additional array specification. */
3941 find_array_spec (gfc_expr *e)
3945 gfc_symbol *derived;
3948 if (e->symtree->n.sym->ts.type == BT_CLASS)
3949 as = e->symtree->n.sym->ts.u.derived->components->as;
3951 as = e->symtree->n.sym->as;
3954 for (ref = e->ref; ref; ref = ref->next)
3959 gfc_internal_error ("find_array_spec(): Missing spec");
3966 if (derived == NULL)
3967 derived = e->symtree->n.sym->ts.u.derived;
3969 c = derived->components;
3971 for (; c; c = c->next)
3972 if (c == ref->u.c.component)
3974 /* Track the sequence of component references. */
3975 if (c->ts.type == BT_DERIVED)
3976 derived = c->ts.u.derived;
3981 gfc_internal_error ("find_array_spec(): Component not found");
3983 if (c->attr.dimension)
3986 gfc_internal_error ("find_array_spec(): unused as(1)");
3997 gfc_internal_error ("find_array_spec(): unused as(2)");
4001 /* Resolve an array reference. */
4004 resolve_array_ref (gfc_array_ref *ar)
4006 int i, check_scalar;
4009 for (i = 0; i < ar->dimen; i++)
4011 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4013 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
4015 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4017 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4022 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4026 ar->dimen_type[i] = DIMEN_ELEMENT;
4030 ar->dimen_type[i] = DIMEN_VECTOR;
4031 if (e->expr_type == EXPR_VARIABLE
4032 && e->symtree->n.sym->ts.type == BT_DERIVED)
4033 ar->start[i] = gfc_get_parentheses (e);
4037 gfc_error ("Array index at %L is an array of rank %d",
4038 &ar->c_where[i], e->rank);
4043 /* If the reference type is unknown, figure out what kind it is. */
4045 if (ar->type == AR_UNKNOWN)
4047 ar->type = AR_ELEMENT;
4048 for (i = 0; i < ar->dimen; i++)
4049 if (ar->dimen_type[i] == DIMEN_RANGE
4050 || ar->dimen_type[i] == DIMEN_VECTOR)
4052 ar->type = AR_SECTION;
4057 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4065 resolve_substring (gfc_ref *ref)
4067 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4069 if (ref->u.ss.start != NULL)
4071 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4074 if (ref->u.ss.start->ts.type != BT_INTEGER)
4076 gfc_error ("Substring start index at %L must be of type INTEGER",
4077 &ref->u.ss.start->where);
4081 if (ref->u.ss.start->rank != 0)
4083 gfc_error ("Substring start index at %L must be scalar",
4084 &ref->u.ss.start->where);
4088 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4089 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4090 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4092 gfc_error ("Substring start index at %L is less than one",
4093 &ref->u.ss.start->where);
4098 if (ref->u.ss.end != NULL)
4100 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4103 if (ref->u.ss.end->ts.type != BT_INTEGER)
4105 gfc_error ("Substring end index at %L must be of type INTEGER",
4106 &ref->u.ss.end->where);
4110 if (ref->u.ss.end->rank != 0)
4112 gfc_error ("Substring end index at %L must be scalar",
4113 &ref->u.ss.end->where);
4117 if (ref->u.ss.length != NULL
4118 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4119 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4120 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4122 gfc_error ("Substring end index at %L exceeds the string length",
4123 &ref->u.ss.start->where);
4127 if (compare_bound_mpz_t (ref->u.ss.end,
4128 gfc_integer_kinds[k].huge) == CMP_GT
4129 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4130 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4132 gfc_error ("Substring end index at %L is too large",
4133 &ref->u.ss.end->where);
4142 /* This function supplies missing substring charlens. */
4145 gfc_resolve_substring_charlen (gfc_expr *e)
4148 gfc_expr *start, *end;
4150 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4151 if (char_ref->type == REF_SUBSTRING)
4157 gcc_assert (char_ref->next == NULL);
4161 if (e->ts.u.cl->length)
4162 gfc_free_expr (e->ts.u.cl->length);
4163 else if (e->expr_type == EXPR_VARIABLE
4164 && e->symtree->n.sym->attr.dummy)
4168 e->ts.type = BT_CHARACTER;
4169 e->ts.kind = gfc_default_character_kind;
4172 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4174 if (char_ref->u.ss.start)
4175 start = gfc_copy_expr (char_ref->u.ss.start);
4177 start = gfc_int_expr (1);
4179 if (char_ref->u.ss.end)
4180 end = gfc_copy_expr (char_ref->u.ss.end);
4181 else if (e->expr_type == EXPR_VARIABLE)
4182 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4189 /* Length = (end - start +1). */
4190 e->ts.u.cl->length = gfc_subtract (end, start);
4191 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length, gfc_int_expr (1));
4193 e->ts.u.cl->length->ts.type = BT_INTEGER;
4194 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4196 /* Make sure that the length is simplified. */
4197 gfc_simplify_expr (e->ts.u.cl->length, 1);
4198 gfc_resolve_expr (e->ts.u.cl->length);
4202 /* Resolve subtype references. */
4205 resolve_ref (gfc_expr *expr)
4207 int current_part_dimension, n_components, seen_part_dimension;
4210 for (ref = expr->ref; ref; ref = ref->next)
4211 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4213 find_array_spec (expr);
4217 for (ref = expr->ref; ref; ref = ref->next)
4221 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4229 resolve_substring (ref);
4233 /* Check constraints on part references. */
4235 current_part_dimension = 0;
4236 seen_part_dimension = 0;
4239 for (ref = expr->ref; ref; ref = ref->next)
4244 switch (ref->u.ar.type)
4248 current_part_dimension = 1;
4252 current_part_dimension = 0;
4256 gfc_internal_error ("resolve_ref(): Bad array reference");
4262 if (current_part_dimension || seen_part_dimension)
4264 if (ref->u.c.component->attr.pointer)
4266 gfc_error ("Component to the right of a part reference "
4267 "with nonzero rank must not have the POINTER "
4268 "attribute at %L", &expr->where);
4271 else if (ref->u.c.component->attr.allocatable)
4273 gfc_error ("Component to the right of a part reference "
4274 "with nonzero rank must not have the ALLOCATABLE "
4275 "attribute at %L", &expr->where);
4287 if (((ref->type == REF_COMPONENT && n_components > 1)
4288 || ref->next == NULL)
4289 && current_part_dimension
4290 && seen_part_dimension)
4292 gfc_error ("Two or more part references with nonzero rank must "
4293 "not be specified at %L", &expr->where);
4297 if (ref->type == REF_COMPONENT)
4299 if (current_part_dimension)
4300 seen_part_dimension = 1;
4302 /* reset to make sure */
4303 current_part_dimension = 0;
4311 /* Given an expression, determine its shape. This is easier than it sounds.
4312 Leaves the shape array NULL if it is not possible to determine the shape. */
4315 expression_shape (gfc_expr *e)
4317 mpz_t array[GFC_MAX_DIMENSIONS];
4320 if (e->rank == 0 || e->shape != NULL)
4323 for (i = 0; i < e->rank; i++)
4324 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4327 e->shape = gfc_get_shape (e->rank);
4329 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4334 for (i--; i >= 0; i--)
4335 mpz_clear (array[i]);
4339 /* Given a variable expression node, compute the rank of the expression by
4340 examining the base symbol and any reference structures it may have. */
4343 expression_rank (gfc_expr *e)
4348 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4349 could lead to serious confusion... */
4350 gcc_assert (e->expr_type != EXPR_COMPCALL);
4354 if (e->expr_type == EXPR_ARRAY)
4356 /* Constructors can have a rank different from one via RESHAPE(). */
4358 if (e->symtree == NULL)
4364 e->rank = (e->symtree->n.sym->as == NULL)
4365 ? 0 : e->symtree->n.sym->as->rank;
4371 for (ref = e->ref; ref; ref = ref->next)
4373 if (ref->type != REF_ARRAY)
4376 if (ref->u.ar.type == AR_FULL)
4378 rank = ref->u.ar.as->rank;
4382 if (ref->u.ar.type == AR_SECTION)
4384 /* Figure out the rank of the section. */
4386 gfc_internal_error ("expression_rank(): Two array specs");
4388 for (i = 0; i < ref->u.ar.dimen; i++)
4389 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4390 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4400 expression_shape (e);
4404 /* Resolve a variable expression. */
4407 resolve_variable (gfc_expr *e)
4414 if (e->symtree == NULL)
4417 if (e->ref && resolve_ref (e) == FAILURE)
4420 sym = e->symtree->n.sym;
4421 if (sym->attr.flavor == FL_PROCEDURE
4422 && (!sym->attr.function
4423 || (sym->attr.function && sym->result
4424 && sym->result->attr.proc_pointer
4425 && !sym->result->attr.function)))
4427 e->ts.type = BT_PROCEDURE;
4428 goto resolve_procedure;
4431 if (sym->ts.type != BT_UNKNOWN)
4432 gfc_variable_attr (e, &e->ts);
4435 /* Must be a simple variable reference. */
4436 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4441 if (check_assumed_size_reference (sym, e))
4444 /* Deal with forward references to entries during resolve_code, to
4445 satisfy, at least partially, 12.5.2.5. */
4446 if (gfc_current_ns->entries
4447 && current_entry_id == sym->entry_id
4450 && cs_base->current->op != EXEC_ENTRY)
4452 gfc_entry_list *entry;
4453 gfc_formal_arglist *formal;
4457 /* If the symbol is a dummy... */
4458 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4460 entry = gfc_current_ns->entries;
4463 /* ...test if the symbol is a parameter of previous entries. */
4464 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4465 for (formal = entry->sym->formal; formal; formal = formal->next)
4467 if (formal->sym && sym->name == formal->sym->name)
4471 /* If it has not been seen as a dummy, this is an error. */
4474 if (specification_expr)
4475 gfc_error ("Variable '%s', used in a specification expression"
4476 ", is referenced at %L before the ENTRY statement "
4477 "in which it is a parameter",
4478 sym->name, &cs_base->current->loc);
4480 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4481 "statement in which it is a parameter",
4482 sym->name, &cs_base->current->loc);
4487 /* Now do the same check on the specification expressions. */
4488 specification_expr = 1;
4489 if (sym->ts.type == BT_CHARACTER
4490 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4494 for (n = 0; n < sym->as->rank; n++)
4496 specification_expr = 1;
4497 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4499 specification_expr = 1;
4500 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4503 specification_expr = 0;
4506 /* Update the symbol's entry level. */
4507 sym->entry_id = current_entry_id + 1;
4511 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4518 /* Checks to see that the correct symbol has been host associated.
4519 The only situation where this arises is that in which a twice
4520 contained function is parsed after the host association is made.
4521 Therefore, on detecting this, change the symbol in the expression
4522 and convert the array reference into an actual arglist if the old
4523 symbol is a variable. */
4525 check_host_association (gfc_expr *e)
4527 gfc_symbol *sym, *old_sym;
4531 gfc_actual_arglist *arg, *tail = NULL;
4532 bool retval = e->expr_type == EXPR_FUNCTION;
4534 /* If the expression is the result of substitution in
4535 interface.c(gfc_extend_expr) because there is no way in
4536 which the host association can be wrong. */
4537 if (e->symtree == NULL
4538 || e->symtree->n.sym == NULL
4539 || e->user_operator)
4542 old_sym = e->symtree->n.sym;
4544 if (gfc_current_ns->parent
4545 && old_sym->ns != gfc_current_ns)
4547 /* Use the 'USE' name so that renamed module symbols are
4548 correctly handled. */
4549 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4551 if (sym && old_sym != sym
4552 && sym->ts.type == old_sym->ts.type
4553 && sym->attr.flavor == FL_PROCEDURE
4554 && sym->attr.contained)
4556 /* Clear the shape, since it might not be valid. */
4557 if (e->shape != NULL)
4559 for (n = 0; n < e->rank; n++)
4560 mpz_clear (e->shape[n]);
4562 gfc_free (e->shape);
4565 /* Give the expression the right symtree! */
4566 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4567 gcc_assert (st != NULL);
4569 if (old_sym->attr.flavor == FL_PROCEDURE
4570 || e->expr_type == EXPR_FUNCTION)
4572 /* Original was function so point to the new symbol, since
4573 the actual argument list is already attached to the
4575 e->value.function.esym = NULL;
4580 /* Original was variable so convert array references into
4581 an actual arglist. This does not need any checking now
4582 since gfc_resolve_function will take care of it. */
4583 e->value.function.actual = NULL;
4584 e->expr_type = EXPR_FUNCTION;
4587 /* Ambiguity will not arise if the array reference is not
4588 the last reference. */
4589 for (ref = e->ref; ref; ref = ref->next)
4590 if (ref->type == REF_ARRAY && ref->next == NULL)
4593 gcc_assert (ref->type == REF_ARRAY);
4595 /* Grab the start expressions from the array ref and
4596 copy them into actual arguments. */
4597 for (n = 0; n < ref->u.ar.dimen; n++)
4599 arg = gfc_get_actual_arglist ();
4600 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4601 if (e->value.function.actual == NULL)
4602 tail = e->value.function.actual = arg;
4610 /* Dump the reference list and set the rank. */
4611 gfc_free_ref_list (e->ref);
4613 e->rank = sym->as ? sym->as->rank : 0;
4616 gfc_resolve_expr (e);
4620 /* This might have changed! */
4621 return e->expr_type == EXPR_FUNCTION;
4626 gfc_resolve_character_operator (gfc_expr *e)
4628 gfc_expr *op1 = e->value.op.op1;
4629 gfc_expr *op2 = e->value.op.op2;
4630 gfc_expr *e1 = NULL;
4631 gfc_expr *e2 = NULL;
4633 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4635 if (op1->ts.u.cl && op1->ts.u.cl->length)
4636 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4637 else if (op1->expr_type == EXPR_CONSTANT)
4638 e1 = gfc_int_expr (op1->value.character.length);
4640 if (op2->ts.u.cl && op2->ts.u.cl->length)
4641 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4642 else if (op2->expr_type == EXPR_CONSTANT)
4643 e2 = gfc_int_expr (op2->value.character.length);
4645 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4650 e->ts.u.cl->length = gfc_add (e1, e2);
4651 e->ts.u.cl->length->ts.type = BT_INTEGER;
4652 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4653 gfc_simplify_expr (e->ts.u.cl->length, 0);
4654 gfc_resolve_expr (e->ts.u.cl->length);
4660 /* Ensure that an character expression has a charlen and, if possible, a
4661 length expression. */
4664 fixup_charlen (gfc_expr *e)
4666 /* The cases fall through so that changes in expression type and the need
4667 for multiple fixes are picked up. In all circumstances, a charlen should
4668 be available for the middle end to hang a backend_decl on. */
4669 switch (e->expr_type)
4672 gfc_resolve_character_operator (e);
4675 if (e->expr_type == EXPR_ARRAY)
4676 gfc_resolve_character_array_constructor (e);
4678 case EXPR_SUBSTRING:
4679 if (!e->ts.u.cl && e->ref)
4680 gfc_resolve_substring_charlen (e);
4684 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4691 /* Update an actual argument to include the passed-object for type-bound
4692 procedures at the right position. */
4694 static gfc_actual_arglist*
4695 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
4698 gcc_assert (argpos > 0);
4702 gfc_actual_arglist* result;
4704 result = gfc_get_actual_arglist ();
4708 result->name = name;
4714 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
4716 lst = update_arglist_pass (NULL, po, argpos - 1, name);
4721 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4724 extract_compcall_passed_object (gfc_expr* e)
4728 gcc_assert (e->expr_type == EXPR_COMPCALL);
4730 if (e->value.compcall.base_object)
4731 po = gfc_copy_expr (e->value.compcall.base_object);
4734 po = gfc_get_expr ();
4735 po->expr_type = EXPR_VARIABLE;
4736 po->symtree = e->symtree;
4737 po->ref = gfc_copy_ref (e->ref);
4740 if (gfc_resolve_expr (po) == FAILURE)
4747 /* Update the arglist of an EXPR_COMPCALL expression to include the
4751 update_compcall_arglist (gfc_expr* e)
4754 gfc_typebound_proc* tbp;
4756 tbp = e->value.compcall.tbp;
4761 po = extract_compcall_passed_object (e);
4767 gfc_error ("Passed-object at %L must be scalar", &e->where);
4771 if (tbp->nopass || e->value.compcall.ignore_pass)
4777 gcc_assert (tbp->pass_arg_num > 0);
4778 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4786 /* Extract the passed object from a PPC call (a copy of it). */
4789 extract_ppc_passed_object (gfc_expr *e)
4794 po = gfc_get_expr ();
4795 po->expr_type = EXPR_VARIABLE;
4796 po->symtree = e->symtree;
4797 po->ref = gfc_copy_ref (e->ref);
4799 /* Remove PPC reference. */
4801 while ((*ref)->next)
4802 (*ref) = (*ref)->next;
4803 gfc_free_ref_list (*ref);
4806 if (gfc_resolve_expr (po) == FAILURE)
4813 /* Update the actual arglist of a procedure pointer component to include the
4817 update_ppc_arglist (gfc_expr* e)
4821 gfc_typebound_proc* tb;
4823 if (!gfc_is_proc_ptr_comp (e, &ppc))
4830 else if (tb->nopass)
4833 po = extract_ppc_passed_object (e);
4839 gfc_error ("Passed-object at %L must be scalar", &e->where);
4843 gcc_assert (tb->pass_arg_num > 0);
4844 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4852 /* Check that the object a TBP is called on is valid, i.e. it must not be
4853 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
4856 check_typebound_baseobject (gfc_expr* e)
4860 base = extract_compcall_passed_object (e);
4864 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
4866 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
4868 gfc_error ("Base object for type-bound procedure call at %L is of"
4869 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
4877 /* Resolve a call to a type-bound procedure, either function or subroutine,
4878 statically from the data in an EXPR_COMPCALL expression. The adapted
4879 arglist and the target-procedure symtree are returned. */
4882 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
4883 gfc_actual_arglist** actual)
4885 gcc_assert (e->expr_type == EXPR_COMPCALL);
4886 gcc_assert (!e->value.compcall.tbp->is_generic);
4888 /* Update the actual arglist for PASS. */
4889 if (update_compcall_arglist (e) == FAILURE)
4892 *actual = e->value.compcall.actual;
4893 *target = e->value.compcall.tbp->u.specific;
4895 gfc_free_ref_list (e->ref);
4897 e->value.compcall.actual = NULL;
4903 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
4904 which of the specific bindings (if any) matches the arglist and transform
4905 the expression into a call of that binding. */
4908 resolve_typebound_generic_call (gfc_expr* e)
4910 gfc_typebound_proc* genproc;
4911 const char* genname;
4913 gcc_assert (e->expr_type == EXPR_COMPCALL);
4914 genname = e->value.compcall.name;
4915 genproc = e->value.compcall.tbp;
4917 if (!genproc->is_generic)
4920 /* Try the bindings on this type and in the inheritance hierarchy. */
4921 for (; genproc; genproc = genproc->overridden)
4925 gcc_assert (genproc->is_generic);
4926 for (g = genproc->u.generic; g; g = g->next)
4929 gfc_actual_arglist* args;
4932 gcc_assert (g->specific);
4934 if (g->specific->error)
4937 target = g->specific->u.specific->n.sym;
4939 /* Get the right arglist by handling PASS/NOPASS. */
4940 args = gfc_copy_actual_arglist (e->value.compcall.actual);
4941 if (!g->specific->nopass)
4944 po = extract_compcall_passed_object (e);
4948 gcc_assert (g->specific->pass_arg_num > 0);
4949 gcc_assert (!g->specific->error);
4950 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
4951 g->specific->pass_arg);
4953 resolve_actual_arglist (args, target->attr.proc,
4954 is_external_proc (target) && !target->formal);
4956 /* Check if this arglist matches the formal. */
4957 matches = gfc_arglist_matches_symbol (&args, target);
4959 /* Clean up and break out of the loop if we've found it. */
4960 gfc_free_actual_arglist (args);
4963 e->value.compcall.tbp = g->specific;
4969 /* Nothing matching found! */
4970 gfc_error ("Found no matching specific binding for the call to the GENERIC"
4971 " '%s' at %L", genname, &e->where);
4979 /* Resolve a call to a type-bound subroutine. */
4982 resolve_typebound_call (gfc_code* c)
4984 gfc_actual_arglist* newactual;
4985 gfc_symtree* target;
4987 /* Check that's really a SUBROUTINE. */
4988 if (!c->expr1->value.compcall.tbp->subroutine)
4990 gfc_error ("'%s' at %L should be a SUBROUTINE",
4991 c->expr1->value.compcall.name, &c->loc);
4995 if (check_typebound_baseobject (c->expr1) == FAILURE)
4998 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
5001 /* Transform into an ordinary EXEC_CALL for now. */
5003 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5006 c->ext.actual = newactual;
5007 c->symtree = target;
5008 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5010 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5012 gfc_free_expr (c->expr1);
5013 c->expr1 = gfc_get_expr ();
5014 c->expr1->expr_type = EXPR_FUNCTION;
5015 c->expr1->symtree = target;
5016 c->expr1->where = c->loc;
5018 return resolve_call (c);
5022 /* Resolve a component-call expression. This originally was intended
5023 only to see functions. However, it is convenient to use it in
5024 resolving subroutine class methods, since we do not have to add a
5025 gfc_code each time. */
5027 resolve_compcall (gfc_expr* e, bool fcn)
5029 gfc_actual_arglist* newactual;
5030 gfc_symtree* target;
5032 /* Check that's really a FUNCTION. */
5033 if (fcn && !e->value.compcall.tbp->function)
5035 gfc_error ("'%s' at %L should be a FUNCTION",
5036 e->value.compcall.name, &e->where);
5039 else if (!fcn && !e->value.compcall.tbp->subroutine)
5041 /* To resolve class member calls, we borrow this bit
5042 of code to select the specific procedures. */
5043 gfc_error ("'%s' at %L should be a SUBROUTINE",
5044 e->value.compcall.name, &e->where);
5048 /* These must not be assign-calls! */
5049 gcc_assert (!e->value.compcall.assign);
5051 if (check_typebound_baseobject (e) == FAILURE)
5054 if (resolve_typebound_generic_call (e) == FAILURE)
5056 gcc_assert (!e->value.compcall.tbp->is_generic);
5058 /* Take the rank from the function's symbol. */
5059 if (e->value.compcall.tbp->u.specific->n.sym->as)
5060 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5062 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5063 arglist to the TBP's binding target. */
5065 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5068 e->value.function.actual = newactual;
5069 e->value.function.name = e->value.compcall.name;
5070 e->value.function.esym = target->n.sym;
5071 e->value.function.class_esym = NULL;
5072 e->value.function.isym = NULL;
5073 e->symtree = target;
5074 e->ts = target->n.sym->ts;
5075 e->expr_type = EXPR_FUNCTION;
5077 /* Resolution is not necessary if this is a class subroutine; this
5078 function only has to identify the specific proc. Resolution of
5079 the call will be done next in resolve_typebound_call. */
5080 return fcn ? gfc_resolve_expr (e) : SUCCESS;
5084 /* Resolve a typebound call for the members in a class. This group of
5085 functions implements dynamic dispatch in the provisional version
5086 of f03 OOP. As soon as vtables are in place and contain pointers
5087 to methods, this will no longer be necessary. */
5088 static gfc_expr *list_e;
5089 static void check_class_members (gfc_symbol *);
5090 static gfc_try class_try;
5091 static bool fcn_flag;
5092 static gfc_symbol *class_object;
5096 check_members (gfc_symbol *derived)
5098 if (derived->attr.flavor == FL_DERIVED)
5099 check_class_members (derived);
5104 check_class_members (gfc_symbol *derived)
5106 gfc_symbol* tbp_sym;
5109 gfc_class_esym_list *etmp;
5111 e = gfc_copy_expr (list_e);
5113 tbp = gfc_find_typebound_proc (derived, &class_try,
5114 e->value.compcall.name,
5119 gfc_error ("no typebound available procedure named '%s' at %L",
5120 e->value.compcall.name, &e->where);
5124 if (tbp->n.tb->is_generic)
5128 /* If we have to match a passed class member, force the actual
5129 expression to have the correct type. */
5130 if (!tbp->n.tb->nopass)
5132 if (e->value.compcall.base_object == NULL)
5133 e->value.compcall.base_object =
5134 extract_compcall_passed_object (e);
5136 e->value.compcall.base_object->ts.type = BT_DERIVED;
5137 e->value.compcall.base_object->ts.u.derived = derived;
5141 tbp_sym = tbp->n.tb->u.specific->n.sym;
5143 e->value.compcall.tbp = tbp->n.tb;
5144 e->value.compcall.name = tbp->name;
5146 /* Let the original expresssion catch the assertion in
5147 resolve_compcall, since this flag does not appear to be reset or
5148 copied in some systems. */
5149 e->value.compcall.assign = 0;
5151 /* Do the renaming, PASSing, generic => specific and other
5152 good things for each class member. */
5153 class_try = (resolve_compcall (e, fcn_flag) == SUCCESS)
5154 ? class_try : FAILURE;
5156 /* Now transfer the found symbol to the esym list. */
5157 if (class_try == SUCCESS)
5159 etmp = list_e->value.function.class_esym;
5160 list_e->value.function.class_esym
5161 = gfc_get_class_esym_list();
5162 list_e->value.function.class_esym->next = etmp;
5163 list_e->value.function.class_esym->derived = derived;
5164 list_e->value.function.class_esym->esym
5165 = e->value.function.esym;
5170 /* Burrow down into grandchildren types. */
5171 if (derived->f2k_derived)
5172 gfc_traverse_ns (derived->f2k_derived, check_members);
5176 /* Eliminate esym_lists where all the members point to the
5177 typebound procedure of the declared type; ie. one where
5178 type selection has no effect.. */
5180 resolve_class_esym (gfc_expr *e)
5182 gfc_class_esym_list *p, *q;
5185 gcc_assert (e && e->expr_type == EXPR_FUNCTION);
5187 p = e->value.function.class_esym;
5191 for (; p; p = p->next)
5192 empty = empty && (e->value.function.esym == p->esym);
5196 p = e->value.function.class_esym;
5202 e->value.function.class_esym = NULL;
5207 /* Generate an expression for the vindex, given the reference to
5208 the class of the final expression (class_ref), the base of the
5209 full reference list (new_ref), the declared type and the class
5212 vindex_expr (gfc_ref *class_ref, gfc_ref *new_ref,
5213 gfc_symbol *declared, gfc_symtree *st)
5218 /* Build an expression for the correct vindex; ie. that of the last
5220 ref = gfc_get_ref();
5221 ref->type = REF_COMPONENT;
5222 ref->u.c.component = declared->components->next;
5223 ref->u.c.sym = declared;
5227 class_ref->next = ref;
5231 gfc_free_ref_list (new_ref);
5234 vindex = gfc_get_expr ();
5235 vindex->expr_type = EXPR_VARIABLE;
5236 vindex->symtree = st;
5237 vindex->symtree->n.sym->refs++;
5238 vindex->ts = ref->u.c.component->ts;
5239 vindex->ref = new_ref;
5245 /* Get the ultimate declared type from an expression. In addition,
5246 return the last class/derived type reference and the copy of the
5249 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5252 gfc_symbol *declared;
5257 *new_ref = gfc_copy_ref (e->ref);
5258 for (ref = *new_ref; ref; ref = ref->next)
5260 if (ref->type != REF_COMPONENT)
5263 if (ref->u.c.component->ts.type == BT_CLASS
5264 || ref->u.c.component->ts.type == BT_DERIVED)
5266 declared = ref->u.c.component->ts.u.derived;
5271 if (declared == NULL)
5272 declared = e->symtree->n.sym->ts.u.derived;
5278 /* Resolve a CLASS typebound function, or 'method'. */
5280 resolve_class_compcall (gfc_expr* e)
5282 gfc_symbol *derived, *declared;
5288 class_object = st->n.sym;
5290 /* Get the CLASS declared type. */
5291 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5293 /* Weed out cases of the ultimate component being a derived type. */
5294 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5296 gfc_free_ref_list (new_ref);
5297 return resolve_compcall (e, true);
5300 /* Get the data component, which is of the declared type. */
5301 derived = declared->components->ts.u.derived;
5303 /* Resolve the function call for each member of the class. */
5304 class_try = SUCCESS;
5306 list_e = gfc_copy_expr (e);
5307 check_class_members (derived);
5309 class_try = (resolve_compcall (e, true) == SUCCESS)
5310 ? class_try : FAILURE;
5312 /* Transfer the class list to the original expression. Note that
5313 the class_esym list is cleaned up in trans-expr.c, as the calls
5315 e->value.function.class_esym = list_e->value.function.class_esym;
5316 list_e->value.function.class_esym = NULL;
5317 gfc_free_expr (list_e);
5319 resolve_class_esym (e);
5321 /* More than one typebound procedure so transmit an expression for
5322 the vindex as the selector. */
5323 if (e->value.function.class_esym != NULL)
5324 e->value.function.class_esym->vindex
5325 = vindex_expr (class_ref, new_ref, declared, st);
5330 /* Resolve a CLASS typebound subroutine, or 'method'. */
5332 resolve_class_typebound_call (gfc_code *code)
5334 gfc_symbol *derived, *declared;
5339 st = code->expr1->symtree;
5340 class_object = st->n.sym;
5342 /* Get the CLASS declared type. */
5343 declared = get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5345 /* Weed out cases of the ultimate component being a derived type. */
5346 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5348 gfc_free_ref_list (new_ref);
5349 return resolve_typebound_call (code);
5352 /* Get the data component, which is of the declared type. */
5353 derived = declared->components->ts.u.derived;
5355 class_try = SUCCESS;
5357 list_e = gfc_copy_expr (code->expr1);
5358 check_class_members (derived);
5360 class_try = (resolve_typebound_call (code) == SUCCESS)
5361 ? class_try : FAILURE;
5363 /* Transfer the class list to the original expression. Note that
5364 the class_esym list is cleaned up in trans-expr.c, as the calls
5366 code->expr1->value.function.class_esym
5367 = list_e->value.function.class_esym;
5368 list_e->value.function.class_esym = NULL;
5369 gfc_free_expr (list_e);
5371 resolve_class_esym (code->expr1);
5373 /* More than one typebound procedure so transmit an expression for
5374 the vindex as the selector. */
5375 if (code->expr1->value.function.class_esym != NULL)
5376 code->expr1->value.function.class_esym->vindex
5377 = vindex_expr (class_ref, new_ref, declared, st);
5383 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5386 resolve_ppc_call (gfc_code* c)
5388 gfc_component *comp;
5391 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5394 c->resolved_sym = c->expr1->symtree->n.sym;
5395 c->expr1->expr_type = EXPR_VARIABLE;
5397 if (!comp->attr.subroutine)
5398 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5400 if (resolve_ref (c->expr1) == FAILURE)
5403 if (update_ppc_arglist (c->expr1) == FAILURE)
5406 c->ext.actual = c->expr1->value.compcall.actual;
5408 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5409 comp->formal == NULL) == FAILURE)
5412 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5418 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5421 resolve_expr_ppc (gfc_expr* e)
5423 gfc_component *comp;
5426 b = gfc_is_proc_ptr_comp (e, &comp);
5429 /* Convert to EXPR_FUNCTION. */
5430 e->expr_type = EXPR_FUNCTION;
5431 e->value.function.isym = NULL;
5432 e->value.function.actual = e->value.compcall.actual;
5434 if (comp->as != NULL)
5435 e->rank = comp->as->rank;
5437 if (!comp->attr.function)
5438 gfc_add_function (&comp->attr, comp->name, &e->where);
5440 if (resolve_ref (e) == FAILURE)
5443 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5444 comp->formal == NULL) == FAILURE)
5447 if (update_ppc_arglist (e) == FAILURE)
5450 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5456 /* Resolve an expression. That is, make sure that types of operands agree
5457 with their operators, intrinsic operators are converted to function calls
5458 for overloaded types and unresolved function references are resolved. */
5461 gfc_resolve_expr (gfc_expr *e)
5468 switch (e->expr_type)
5471 t = resolve_operator (e);
5477 if (check_host_association (e))
5478 t = resolve_function (e);
5481 t = resolve_variable (e);
5483 expression_rank (e);
5486 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5487 && e->ref->type != REF_SUBSTRING)
5488 gfc_resolve_substring_charlen (e);
5493 if (e->symtree && e->symtree->n.sym->ts.type == BT_CLASS)
5494 t = resolve_class_compcall (e);
5496 t = resolve_compcall (e, true);
5499 case EXPR_SUBSTRING:
5500 t = resolve_ref (e);
5509 t = resolve_expr_ppc (e);
5514 if (resolve_ref (e) == FAILURE)
5517 t = gfc_resolve_array_constructor (e);
5518 /* Also try to expand a constructor. */
5521 expression_rank (e);
5522 gfc_expand_constructor (e);
5525 /* This provides the opportunity for the length of constructors with
5526 character valued function elements to propagate the string length
5527 to the expression. */
5528 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5529 t = gfc_resolve_character_array_constructor (e);
5533 case EXPR_STRUCTURE:
5534 t = resolve_ref (e);
5538 t = resolve_structure_cons (e);
5542 t = gfc_simplify_expr (e, 0);
5546 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5549 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5556 /* Resolve an expression from an iterator. They must be scalar and have
5557 INTEGER or (optionally) REAL type. */
5560 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5561 const char *name_msgid)
5563 if (gfc_resolve_expr (expr) == FAILURE)
5566 if (expr->rank != 0)
5568 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5572 if (expr->ts.type != BT_INTEGER)
5574 if (expr->ts.type == BT_REAL)
5577 return gfc_notify_std (GFC_STD_F95_DEL,
5578 "Deleted feature: %s at %L must be integer",
5579 _(name_msgid), &expr->where);
5582 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5589 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5597 /* Resolve the expressions in an iterator structure. If REAL_OK is
5598 false allow only INTEGER type iterators, otherwise allow REAL types. */
5601 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5603 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5607 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5609 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5614 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5615 "Start expression in DO loop") == FAILURE)
5618 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5619 "End expression in DO loop") == FAILURE)
5622 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5623 "Step expression in DO loop") == FAILURE)
5626 if (iter->step->expr_type == EXPR_CONSTANT)
5628 if ((iter->step->ts.type == BT_INTEGER
5629 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5630 || (iter->step->ts.type == BT_REAL
5631 && mpfr_sgn (iter->step->value.real) == 0))
5633 gfc_error ("Step expression in DO loop at %L cannot be zero",
5634 &iter->step->where);
5639 /* Convert start, end, and step to the same type as var. */
5640 if (iter->start->ts.kind != iter->var->ts.kind
5641 || iter->start->ts.type != iter->var->ts.type)
5642 gfc_convert_type (iter->start, &iter->var->ts, 2);
5644 if (iter->end->ts.kind != iter->var->ts.kind
5645 || iter->end->ts.type != iter->var->ts.type)
5646 gfc_convert_type (iter->end, &iter->var->ts, 2);
5648 if (iter->step->ts.kind != iter->var->ts.kind
5649 || iter->step->ts.type != iter->var->ts.type)
5650 gfc_convert_type (iter->step, &iter->var->ts, 2);
5652 if (iter->start->expr_type == EXPR_CONSTANT
5653 && iter->end->expr_type == EXPR_CONSTANT
5654 && iter->step->expr_type == EXPR_CONSTANT)
5657 if (iter->start->ts.type == BT_INTEGER)
5659 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5660 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5664 sgn = mpfr_sgn (iter->step->value.real);
5665 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5667 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5668 gfc_warning ("DO loop at %L will be executed zero times",
5669 &iter->step->where);
5676 /* Traversal function for find_forall_index. f == 2 signals that
5677 that variable itself is not to be checked - only the references. */
5680 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5682 if (expr->expr_type != EXPR_VARIABLE)
5685 /* A scalar assignment */
5686 if (!expr->ref || *f == 1)
5688 if (expr->symtree->n.sym == sym)
5700 /* Check whether the FORALL index appears in the expression or not.
5701 Returns SUCCESS if SYM is found in EXPR. */
5704 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5706 if (gfc_traverse_expr (expr, sym, forall_index, f))
5713 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5714 to be a scalar INTEGER variable. The subscripts and stride are scalar
5715 INTEGERs, and if stride is a constant it must be nonzero.
5716 Furthermore "A subscript or stride in a forall-triplet-spec shall
5717 not contain a reference to any index-name in the
5718 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5721 resolve_forall_iterators (gfc_forall_iterator *it)
5723 gfc_forall_iterator *iter, *iter2;
5725 for (iter = it; iter; iter = iter->next)
5727 if (gfc_resolve_expr (iter->var) == SUCCESS
5728 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5729 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5732 if (gfc_resolve_expr (iter->start) == SUCCESS
5733 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5734 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5735 &iter->start->where);
5736 if (iter->var->ts.kind != iter->start->ts.kind)
5737 gfc_convert_type (iter->start, &iter->var->ts, 2);
5739 if (gfc_resolve_expr (iter->end) == SUCCESS
5740 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5741 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5743 if (iter->var->ts.kind != iter->end->ts.kind)
5744 gfc_convert_type (iter->end, &iter->var->ts, 2);
5746 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5748 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5749 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5750 &iter->stride->where, "INTEGER");
5752 if (iter->stride->expr_type == EXPR_CONSTANT
5753 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5754 gfc_error ("FORALL stride expression at %L cannot be zero",
5755 &iter->stride->where);
5757 if (iter->var->ts.kind != iter->stride->ts.kind)
5758 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5761 for (iter = it; iter; iter = iter->next)
5762 for (iter2 = iter; iter2; iter2 = iter2->next)
5764 if (find_forall_index (iter2->start,
5765 iter->var->symtree->n.sym, 0) == SUCCESS
5766 || find_forall_index (iter2->end,
5767 iter->var->symtree->n.sym, 0) == SUCCESS
5768 || find_forall_index (iter2->stride,
5769 iter->var->symtree->n.sym, 0) == SUCCESS)
5770 gfc_error ("FORALL index '%s' may not appear in triplet "
5771 "specification at %L", iter->var->symtree->name,
5772 &iter2->start->where);
5777 /* Given a pointer to a symbol that is a derived type, see if it's
5778 inaccessible, i.e. if it's defined in another module and the components are
5779 PRIVATE. The search is recursive if necessary. Returns zero if no
5780 inaccessible components are found, nonzero otherwise. */
5783 derived_inaccessible (gfc_symbol *sym)
5787 if (sym->attr.use_assoc && sym->attr.private_comp)
5790 for (c = sym->components; c; c = c->next)
5792 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
5800 /* Resolve the argument of a deallocate expression. The expression must be
5801 a pointer or a full array. */
5804 resolve_deallocate_expr (gfc_expr *e)
5806 symbol_attribute attr;
5807 int allocatable, pointer, check_intent_in;
5812 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5813 check_intent_in = 1;
5815 if (gfc_resolve_expr (e) == FAILURE)
5818 if (e->expr_type != EXPR_VARIABLE)
5821 sym = e->symtree->n.sym;
5823 if (sym->ts.type == BT_CLASS)
5825 allocatable = sym->ts.u.derived->components->attr.allocatable;
5826 pointer = sym->ts.u.derived->components->attr.pointer;
5830 allocatable = sym->attr.allocatable;
5831 pointer = sym->attr.pointer;
5833 for (ref = e->ref; ref; ref = ref->next)
5836 check_intent_in = 0;
5841 if (ref->u.ar.type != AR_FULL)
5846 c = ref->u.c.component;
5847 if (c->ts.type == BT_CLASS)
5849 allocatable = c->ts.u.derived->components->attr.allocatable;
5850 pointer = c->ts.u.derived->components->attr.pointer;
5854 allocatable = c->attr.allocatable;
5855 pointer = c->attr.pointer;
5865 attr = gfc_expr_attr (e);
5867 if (allocatable == 0 && attr.pointer == 0)
5870 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5874 if (check_intent_in && sym->attr.intent == INTENT_IN)
5876 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5877 sym->name, &e->where);
5881 if (e->ts.type == BT_CLASS)
5883 /* Only deallocate the DATA component. */
5884 gfc_add_component_ref (e, "$data");
5891 /* Returns true if the expression e contains a reference to the symbol sym. */
5893 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5895 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
5902 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
5904 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
5908 /* Given the expression node e for an allocatable/pointer of derived type to be
5909 allocated, get the expression node to be initialized afterwards (needed for
5910 derived types with default initializers, and derived types with allocatable
5911 components that need nullification.) */
5914 gfc_expr_to_initialize (gfc_expr *e)
5920 result = gfc_copy_expr (e);
5922 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
5923 for (ref = result->ref; ref; ref = ref->next)
5924 if (ref->type == REF_ARRAY && ref->next == NULL)
5926 ref->u.ar.type = AR_FULL;
5928 for (i = 0; i < ref->u.ar.dimen; i++)
5929 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
5931 result->rank = ref->u.ar.dimen;
5939 /* Resolve the expression in an ALLOCATE statement, doing the additional
5940 checks to see whether the expression is OK or not. The expression must
5941 have a trailing array reference that gives the size of the array. */
5944 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
5946 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
5947 symbol_attribute attr;
5948 gfc_ref *ref, *ref2;
5954 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5955 check_intent_in = 1;
5957 if (gfc_resolve_expr (e) == FAILURE)
5960 /* Make sure the expression is allocatable or a pointer. If it is
5961 pointer, the next-to-last reference must be a pointer. */
5965 sym = e->symtree->n.sym;
5967 /* Check whether ultimate component is abstract and CLASS. */
5970 if (e->expr_type != EXPR_VARIABLE)
5973 attr = gfc_expr_attr (e);
5974 pointer = attr.pointer;
5975 dimension = attr.dimension;
5979 if (sym->ts.type == BT_CLASS)
5981 allocatable = sym->ts.u.derived->components->attr.allocatable;
5982 pointer = sym->ts.u.derived->components->attr.pointer;
5983 dimension = sym->ts.u.derived->components->attr.dimension;
5984 is_abstract = sym->ts.u.derived->components->attr.abstract;
5988 allocatable = sym->attr.allocatable;
5989 pointer = sym->attr.pointer;
5990 dimension = sym->attr.dimension;
5993 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
5996 check_intent_in = 0;
6001 if (ref->next != NULL)
6006 c = ref->u.c.component;
6007 if (c->ts.type == BT_CLASS)
6009 allocatable = c->ts.u.derived->components->attr.allocatable;
6010 pointer = c->ts.u.derived->components->attr.pointer;
6011 dimension = c->ts.u.derived->components->attr.dimension;
6012 is_abstract = c->ts.u.derived->components->attr.abstract;
6016 allocatable = c->attr.allocatable;
6017 pointer = c->attr.pointer;
6018 dimension = c->attr.dimension;
6019 is_abstract = c->attr.abstract;
6031 if (allocatable == 0 && pointer == 0)
6033 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6038 if (is_abstract && !code->expr3 && code->ext.alloc.ts.type == BT_UNKNOWN)
6040 gcc_assert (e->ts.type == BT_CLASS);
6041 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6042 "type-spec or SOURCE=", sym->name, &e->where);
6046 if (check_intent_in && sym->attr.intent == INTENT_IN)
6048 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6049 sym->name, &e->where);
6053 if (pointer || dimension == 0)
6056 /* Make sure the next-to-last reference node is an array specification. */
6058 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
6060 gfc_error ("Array specification required in ALLOCATE statement "
6061 "at %L", &e->where);
6065 /* Make sure that the array section reference makes sense in the
6066 context of an ALLOCATE specification. */
6070 for (i = 0; i < ar->dimen; i++)
6072 if (ref2->u.ar.type == AR_ELEMENT)
6075 switch (ar->dimen_type[i])
6081 if (ar->start[i] != NULL
6082 && ar->end[i] != NULL
6083 && ar->stride[i] == NULL)
6086 /* Fall Through... */
6090 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6097 for (a = code->ext.alloc.list; a; a = a->next)
6099 sym = a->expr->symtree->n.sym;
6101 /* TODO - check derived type components. */
6102 if (sym->ts.type == BT_DERIVED)
6105 if ((ar->start[i] != NULL
6106 && gfc_find_sym_in_expr (sym, ar->start[i]))
6107 || (ar->end[i] != NULL
6108 && gfc_find_sym_in_expr (sym, ar->end[i])))
6110 gfc_error ("'%s' must not appear in the array specification at "
6111 "%L in the same ALLOCATE statement where it is "
6112 "itself allocated", sym->name, &ar->where);
6122 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6124 gfc_expr *stat, *errmsg, *pe, *qe;
6125 gfc_alloc *a, *p, *q;
6127 stat = code->expr1 ? code->expr1 : NULL;
6129 errmsg = code->expr2 ? code->expr2 : NULL;
6131 /* Check the stat variable. */
6134 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6135 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6136 stat->symtree->n.sym->name, &stat->where);
6138 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6139 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6142 if ((stat->ts.type != BT_INTEGER
6143 && !(stat->ref && (stat->ref->type == REF_ARRAY
6144 || stat->ref->type == REF_COMPONENT)))
6146 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6147 "variable", &stat->where);
6149 for (p = code->ext.alloc.list; p; p = p->next)
6150 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6151 gfc_error ("Stat-variable at %L shall not be %sd within "
6152 "the same %s statement", &stat->where, fcn, fcn);
6155 /* Check the errmsg variable. */
6159 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6162 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6163 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6164 errmsg->symtree->n.sym->name, &errmsg->where);
6166 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6167 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6170 if ((errmsg->ts.type != BT_CHARACTER
6172 && (errmsg->ref->type == REF_ARRAY
6173 || errmsg->ref->type == REF_COMPONENT)))
6174 || errmsg->rank > 0 )
6175 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6176 "variable", &errmsg->where);
6178 for (p = code->ext.alloc.list; p; p = p->next)
6179 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6180 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6181 "the same %s statement", &errmsg->where, fcn, fcn);
6184 /* Check that an allocate-object appears only once in the statement.
6185 FIXME: Checking derived types is disabled. */
6186 for (p = code->ext.alloc.list; p; p = p->next)
6189 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6190 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6192 for (q = p->next; q; q = q->next)
6195 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6196 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6197 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6198 gfc_error ("Allocate-object at %L also appears at %L",
6199 &pe->where, &qe->where);
6204 if (strcmp (fcn, "ALLOCATE") == 0)
6206 for (a = code->ext.alloc.list; a; a = a->next)
6207 resolve_allocate_expr (a->expr, code);
6211 for (a = code->ext.alloc.list; a; a = a->next)
6212 resolve_deallocate_expr (a->expr);
6217 /************ SELECT CASE resolution subroutines ************/
6219 /* Callback function for our mergesort variant. Determines interval
6220 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6221 op1 > op2. Assumes we're not dealing with the default case.
6222 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6223 There are nine situations to check. */
6226 compare_cases (const gfc_case *op1, const gfc_case *op2)
6230 if (op1->low == NULL) /* op1 = (:L) */
6232 /* op2 = (:N), so overlap. */
6234 /* op2 = (M:) or (M:N), L < M */
6235 if (op2->low != NULL
6236 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6239 else if (op1->high == NULL) /* op1 = (K:) */
6241 /* op2 = (M:), so overlap. */
6243 /* op2 = (:N) or (M:N), K > N */
6244 if (op2->high != NULL
6245 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6248 else /* op1 = (K:L) */
6250 if (op2->low == NULL) /* op2 = (:N), K > N */
6251 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6253 else if (op2->high == NULL) /* op2 = (M:), L < M */
6254 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6256 else /* op2 = (M:N) */
6260 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6263 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6272 /* Merge-sort a double linked case list, detecting overlap in the
6273 process. LIST is the head of the double linked case list before it
6274 is sorted. Returns the head of the sorted list if we don't see any
6275 overlap, or NULL otherwise. */
6278 check_case_overlap (gfc_case *list)
6280 gfc_case *p, *q, *e, *tail;
6281 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6283 /* If the passed list was empty, return immediately. */
6290 /* Loop unconditionally. The only exit from this loop is a return
6291 statement, when we've finished sorting the case list. */
6298 /* Count the number of merges we do in this pass. */
6301 /* Loop while there exists a merge to be done. */
6306 /* Count this merge. */
6309 /* Cut the list in two pieces by stepping INSIZE places
6310 forward in the list, starting from P. */
6313 for (i = 0; i < insize; i++)
6322 /* Now we have two lists. Merge them! */
6323 while (psize > 0 || (qsize > 0 && q != NULL))
6325 /* See from which the next case to merge comes from. */
6328 /* P is empty so the next case must come from Q. */
6333 else if (qsize == 0 || q == NULL)
6342 cmp = compare_cases (p, q);
6345 /* The whole case range for P is less than the
6353 /* The whole case range for Q is greater than
6354 the case range for P. */
6361 /* The cases overlap, or they are the same
6362 element in the list. Either way, we must
6363 issue an error and get the next case from P. */
6364 /* FIXME: Sort P and Q by line number. */
6365 gfc_error ("CASE label at %L overlaps with CASE "
6366 "label at %L", &p->where, &q->where);
6374 /* Add the next element to the merged list. */
6383 /* P has now stepped INSIZE places along, and so has Q. So
6384 they're the same. */
6389 /* If we have done only one merge or none at all, we've
6390 finished sorting the cases. */
6399 /* Otherwise repeat, merging lists twice the size. */
6405 /* Check to see if an expression is suitable for use in a CASE statement.
6406 Makes sure that all case expressions are scalar constants of the same
6407 type. Return FAILURE if anything is wrong. */
6410 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6412 if (e == NULL) return SUCCESS;
6414 if (e->ts.type != case_expr->ts.type)
6416 gfc_error ("Expression in CASE statement at %L must be of type %s",
6417 &e->where, gfc_basic_typename (case_expr->ts.type));
6421 /* C805 (R808) For a given case-construct, each case-value shall be of
6422 the same type as case-expr. For character type, length differences
6423 are allowed, but the kind type parameters shall be the same. */
6425 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6427 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6428 &e->where, case_expr->ts.kind);
6432 /* Convert the case value kind to that of case expression kind, if needed.
6433 FIXME: Should a warning be issued? */
6434 if (e->ts.kind != case_expr->ts.kind)
6435 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6439 gfc_error ("Expression in CASE statement at %L must be scalar",
6448 /* Given a completely parsed select statement, we:
6450 - Validate all expressions and code within the SELECT.
6451 - Make sure that the selection expression is not of the wrong type.
6452 - Make sure that no case ranges overlap.
6453 - Eliminate unreachable cases and unreachable code resulting from
6454 removing case labels.
6456 The standard does allow unreachable cases, e.g. CASE (5:3). But
6457 they are a hassle for code generation, and to prevent that, we just
6458 cut them out here. This is not necessary for overlapping cases
6459 because they are illegal and we never even try to generate code.
6461 We have the additional caveat that a SELECT construct could have
6462 been a computed GOTO in the source code. Fortunately we can fairly
6463 easily work around that here: The case_expr for a "real" SELECT CASE
6464 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6465 we have to do is make sure that the case_expr is a scalar integer
6469 resolve_select (gfc_code *code)
6472 gfc_expr *case_expr;
6473 gfc_case *cp, *default_case, *tail, *head;
6474 int seen_unreachable;
6480 if (code->expr1 == NULL)
6482 /* This was actually a computed GOTO statement. */
6483 case_expr = code->expr2;
6484 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6485 gfc_error ("Selection expression in computed GOTO statement "
6486 "at %L must be a scalar integer expression",
6489 /* Further checking is not necessary because this SELECT was built
6490 by the compiler, so it should always be OK. Just move the
6491 case_expr from expr2 to expr so that we can handle computed
6492 GOTOs as normal SELECTs from here on. */
6493 code->expr1 = code->expr2;
6498 case_expr = code->expr1;
6500 type = case_expr->ts.type;
6501 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6503 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6504 &case_expr->where, gfc_typename (&case_expr->ts));
6506 /* Punt. Going on here just produce more garbage error messages. */
6510 if (case_expr->rank != 0)
6512 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6513 "expression", &case_expr->where);
6519 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6520 of the SELECT CASE expression and its CASE values. Walk the lists
6521 of case values, and if we find a mismatch, promote case_expr to
6522 the appropriate kind. */
6524 if (type == BT_LOGICAL || type == BT_INTEGER)
6526 for (body = code->block; body; body = body->block)
6528 /* Walk the case label list. */
6529 for (cp = body->ext.case_list; cp; cp = cp->next)
6531 /* Intercept the DEFAULT case. It does not have a kind. */
6532 if (cp->low == NULL && cp->high == NULL)
6535 /* Unreachable case ranges are discarded, so ignore. */
6536 if (cp->low != NULL && cp->high != NULL
6537 && cp->low != cp->high
6538 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6541 /* FIXME: Should a warning be issued? */
6543 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6544 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6546 if (cp->high != NULL
6547 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6548 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6553 /* Assume there is no DEFAULT case. */
6554 default_case = NULL;
6559 for (body = code->block; body; body = body->block)
6561 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6563 seen_unreachable = 0;
6565 /* Walk the case label list, making sure that all case labels
6567 for (cp = body->ext.case_list; cp; cp = cp->next)
6569 /* Count the number of cases in the whole construct. */
6572 /* Intercept the DEFAULT case. */
6573 if (cp->low == NULL && cp->high == NULL)
6575 if (default_case != NULL)
6577 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6578 "by a second DEFAULT CASE at %L",
6579 &default_case->where, &cp->where);
6590 /* Deal with single value cases and case ranges. Errors are
6591 issued from the validation function. */
6592 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
6593 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
6599 if (type == BT_LOGICAL
6600 && ((cp->low == NULL || cp->high == NULL)
6601 || cp->low != cp->high))
6603 gfc_error ("Logical range in CASE statement at %L is not "
6604 "allowed", &cp->low->where);
6609 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
6612 value = cp->low->value.logical == 0 ? 2 : 1;
6613 if (value & seen_logical)
6615 gfc_error ("constant logical value in CASE statement "
6616 "is repeated at %L",
6621 seen_logical |= value;
6624 if (cp->low != NULL && cp->high != NULL
6625 && cp->low != cp->high
6626 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6628 if (gfc_option.warn_surprising)
6629 gfc_warning ("Range specification at %L can never "
6630 "be matched", &cp->where);
6632 cp->unreachable = 1;
6633 seen_unreachable = 1;
6637 /* If the case range can be matched, it can also overlap with
6638 other cases. To make sure it does not, we put it in a
6639 double linked list here. We sort that with a merge sort
6640 later on to detect any overlapping cases. */
6644 head->right = head->left = NULL;
6649 tail->right->left = tail;
6656 /* It there was a failure in the previous case label, give up
6657 for this case label list. Continue with the next block. */
6661 /* See if any case labels that are unreachable have been seen.
6662 If so, we eliminate them. This is a bit of a kludge because
6663 the case lists for a single case statement (label) is a
6664 single forward linked lists. */
6665 if (seen_unreachable)
6667 /* Advance until the first case in the list is reachable. */
6668 while (body->ext.case_list != NULL
6669 && body->ext.case_list->unreachable)
6671 gfc_case *n = body->ext.case_list;
6672 body->ext.case_list = body->ext.case_list->next;
6674 gfc_free_case_list (n);
6677 /* Strip all other unreachable cases. */
6678 if (body->ext.case_list)
6680 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6682 if (cp->next->unreachable)
6684 gfc_case *n = cp->next;
6685 cp->next = cp->next->next;
6687 gfc_free_case_list (n);
6694 /* See if there were overlapping cases. If the check returns NULL,
6695 there was overlap. In that case we don't do anything. If head
6696 is non-NULL, we prepend the DEFAULT case. The sorted list can
6697 then used during code generation for SELECT CASE constructs with
6698 a case expression of a CHARACTER type. */
6701 head = check_case_overlap (head);
6703 /* Prepend the default_case if it is there. */
6704 if (head != NULL && default_case)
6706 default_case->left = NULL;
6707 default_case->right = head;
6708 head->left = default_case;
6712 /* Eliminate dead blocks that may be the result if we've seen
6713 unreachable case labels for a block. */
6714 for (body = code; body && body->block; body = body->block)
6716 if (body->block->ext.case_list == NULL)
6718 /* Cut the unreachable block from the code chain. */
6719 gfc_code *c = body->block;
6720 body->block = c->block;
6722 /* Kill the dead block, but not the blocks below it. */
6724 gfc_free_statements (c);
6728 /* More than two cases is legal but insane for logical selects.
6729 Issue a warning for it. */
6730 if (gfc_option.warn_surprising && type == BT_LOGICAL
6732 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6737 /* Check if a derived type is extensible. */
6740 gfc_type_is_extensible (gfc_symbol *sym)
6742 return !(sym->attr.is_bind_c || sym->attr.sequence);
6746 /* Resolve a SELECT TYPE statement. */
6749 resolve_select_type (gfc_code *code)
6751 gfc_symbol *selector_type;
6752 gfc_code *body, *new_st;
6753 gfc_case *c, *default_case;
6755 char name[GFC_MAX_SYMBOL_LEN];
6762 selector_type = code->expr2->ts.u.derived->components->ts.u.derived;
6764 selector_type = code->expr1->ts.u.derived->components->ts.u.derived;
6766 /* Assume there is no DEFAULT case. */
6767 default_case = NULL;
6769 /* Loop over TYPE IS / CLASS IS cases. */
6770 for (body = code->block; body; body = body->block)
6772 c = body->ext.case_list;
6774 /* Check F03:C815. */
6775 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6776 && !gfc_type_is_extensible (c->ts.u.derived))
6778 gfc_error ("Derived type '%s' at %L must be extensible",
6779 c->ts.u.derived->name, &c->where);
6783 /* Check F03:C816. */
6784 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6785 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
6787 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
6788 c->ts.u.derived->name, &c->where, selector_type->name);
6792 /* Intercept the DEFAULT case. */
6793 if (c->ts.type == BT_UNKNOWN)
6795 /* Check F03:C818. */
6796 if (default_case != NULL)
6797 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6798 "by a second DEFAULT CASE at %L",
6799 &default_case->where, &c->where);
6808 /* Insert assignment for selector variable. */
6809 new_st = gfc_get_code ();
6810 new_st->op = EXEC_ASSIGN;
6811 new_st->expr1 = gfc_copy_expr (code->expr1);
6812 new_st->expr2 = gfc_copy_expr (code->expr2);
6816 /* Put SELECT TYPE statement inside a BLOCK. */
6817 new_st = gfc_get_code ();
6818 new_st->op = code->op;
6819 new_st->expr1 = code->expr1;
6820 new_st->expr2 = code->expr2;
6821 new_st->block = code->block;
6825 ns->code->next = new_st;
6826 code->op = EXEC_BLOCK;
6827 code->expr1 = code->expr2 = NULL;
6832 /* Transform to EXEC_SELECT. */
6833 code->op = EXEC_SELECT;
6834 gfc_add_component_ref (code->expr1, "$vindex");
6836 /* Loop over TYPE IS / CLASS IS cases. */
6837 for (body = code->block; body; body = body->block)
6839 c = body->ext.case_list;
6840 if (c->ts.type == BT_DERIVED)
6841 c->low = c->high = gfc_int_expr (c->ts.u.derived->vindex);
6842 else if (c->ts.type == BT_CLASS)
6843 /* Currently IS CLASS blocks are simply ignored.
6844 TODO: Implement IS CLASS. */
6847 if (c->ts.type != BT_DERIVED)
6849 /* Assign temporary to selector. */
6850 sprintf (name, "tmp$%s", c->ts.u.derived->name);
6851 st = gfc_find_symtree (ns->sym_root, name);
6852 new_st = gfc_get_code ();
6853 new_st->op = EXEC_POINTER_ASSIGN;
6854 new_st->expr1 = gfc_get_variable_expr (st);
6855 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
6856 gfc_add_component_ref (new_st->expr2, "$data");
6857 new_st->next = body->next;
6858 body->next = new_st;
6861 /* Eliminate dead blocks. */
6862 for (body = code; body && body->block; body = body->block)
6864 if (body->block->ext.case_list->unreachable)
6866 /* Cut the unreachable block from the code chain. */
6867 gfc_code *cd = body->block;
6868 body->block = cd->block;
6869 /* Kill the dead block, but not the blocks below it. */
6871 gfc_free_statements (cd);
6875 resolve_select (code);
6880 /* Resolve a transfer statement. This is making sure that:
6881 -- a derived type being transferred has only non-pointer components
6882 -- a derived type being transferred doesn't have private components, unless
6883 it's being transferred from the module where the type was defined
6884 -- we're not trying to transfer a whole assumed size array. */
6887 resolve_transfer (gfc_code *code)
6896 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
6899 sym = exp->symtree->n.sym;
6902 /* Go to actual component transferred. */
6903 for (ref = code->expr1->ref; ref; ref = ref->next)
6904 if (ref->type == REF_COMPONENT)
6905 ts = &ref->u.c.component->ts;
6907 if (ts->type == BT_DERIVED)
6909 /* Check that transferred derived type doesn't contain POINTER
6911 if (ts->u.derived->attr.pointer_comp)
6913 gfc_error ("Data transfer element at %L cannot have "
6914 "POINTER components", &code->loc);
6918 if (ts->u.derived->attr.alloc_comp)
6920 gfc_error ("Data transfer element at %L cannot have "
6921 "ALLOCATABLE components", &code->loc);
6925 if (derived_inaccessible (ts->u.derived))
6927 gfc_error ("Data transfer element at %L cannot have "
6928 "PRIVATE components",&code->loc);
6933 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
6934 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
6936 gfc_error ("Data transfer element at %L cannot be a full reference to "
6937 "an assumed-size array", &code->loc);
6943 /*********** Toplevel code resolution subroutines ***********/
6945 /* Find the set of labels that are reachable from this block. We also
6946 record the last statement in each block. */
6949 find_reachable_labels (gfc_code *block)
6956 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
6958 /* Collect labels in this block. We don't keep those corresponding
6959 to END {IF|SELECT}, these are checked in resolve_branch by going
6960 up through the code_stack. */
6961 for (c = block; c; c = c->next)
6963 if (c->here && c->op != EXEC_END_BLOCK)
6964 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
6967 /* Merge with labels from parent block. */
6970 gcc_assert (cs_base->prev->reachable_labels);
6971 bitmap_ior_into (cs_base->reachable_labels,
6972 cs_base->prev->reachable_labels);
6976 /* Given a branch to a label, see if the branch is conforming.
6977 The code node describes where the branch is located. */
6980 resolve_branch (gfc_st_label *label, gfc_code *code)
6987 /* Step one: is this a valid branching target? */
6989 if (label->defined == ST_LABEL_UNKNOWN)
6991 gfc_error ("Label %d referenced at %L is never defined", label->value,
6996 if (label->defined != ST_LABEL_TARGET)
6998 gfc_error ("Statement at %L is not a valid branch target statement "
6999 "for the branch statement at %L", &label->where, &code->loc);
7003 /* Step two: make sure this branch is not a branch to itself ;-) */
7005 if (code->here == label)
7007 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7011 /* Step three: See if the label is in the same block as the
7012 branching statement. The hard work has been done by setting up
7013 the bitmap reachable_labels. */
7015 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7018 /* Step four: If we haven't found the label in the bitmap, it may
7019 still be the label of the END of the enclosing block, in which
7020 case we find it by going up the code_stack. */
7022 for (stack = cs_base; stack; stack = stack->prev)
7023 if (stack->current->next && stack->current->next->here == label)
7028 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7032 /* The label is not in an enclosing block, so illegal. This was
7033 allowed in Fortran 66, so we allow it as extension. No
7034 further checks are necessary in this case. */
7035 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7036 "as the GOTO statement at %L", &label->where,
7042 /* Check whether EXPR1 has the same shape as EXPR2. */
7045 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7047 mpz_t shape[GFC_MAX_DIMENSIONS];
7048 mpz_t shape2[GFC_MAX_DIMENSIONS];
7049 gfc_try result = FAILURE;
7052 /* Compare the rank. */
7053 if (expr1->rank != expr2->rank)
7056 /* Compare the size of each dimension. */
7057 for (i=0; i<expr1->rank; i++)
7059 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7062 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7065 if (mpz_cmp (shape[i], shape2[i]))
7069 /* When either of the two expression is an assumed size array, we
7070 ignore the comparison of dimension sizes. */
7075 for (i--; i >= 0; i--)
7077 mpz_clear (shape[i]);
7078 mpz_clear (shape2[i]);
7084 /* Check whether a WHERE assignment target or a WHERE mask expression
7085 has the same shape as the outmost WHERE mask expression. */
7088 resolve_where (gfc_code *code, gfc_expr *mask)
7094 cblock = code->block;
7096 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7097 In case of nested WHERE, only the outmost one is stored. */
7098 if (mask == NULL) /* outmost WHERE */
7100 else /* inner WHERE */
7107 /* Check if the mask-expr has a consistent shape with the
7108 outmost WHERE mask-expr. */
7109 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7110 gfc_error ("WHERE mask at %L has inconsistent shape",
7111 &cblock->expr1->where);
7114 /* the assignment statement of a WHERE statement, or the first
7115 statement in where-body-construct of a WHERE construct */
7116 cnext = cblock->next;
7121 /* WHERE assignment statement */
7124 /* Check shape consistent for WHERE assignment target. */
7125 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7126 gfc_error ("WHERE assignment target at %L has "
7127 "inconsistent shape", &cnext->expr1->where);
7131 case EXEC_ASSIGN_CALL:
7132 resolve_call (cnext);
7133 if (!cnext->resolved_sym->attr.elemental)
7134 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7135 &cnext->ext.actual->expr->where);
7138 /* WHERE or WHERE construct is part of a where-body-construct */
7140 resolve_where (cnext, e);
7144 gfc_error ("Unsupported statement inside WHERE at %L",
7147 /* the next statement within the same where-body-construct */
7148 cnext = cnext->next;
7150 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7151 cblock = cblock->block;
7156 /* Resolve assignment in FORALL construct.
7157 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7158 FORALL index variables. */
7161 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7165 for (n = 0; n < nvar; n++)
7167 gfc_symbol *forall_index;
7169 forall_index = var_expr[n]->symtree->n.sym;
7171 /* Check whether the assignment target is one of the FORALL index
7173 if ((code->expr1->expr_type == EXPR_VARIABLE)
7174 && (code->expr1->symtree->n.sym == forall_index))
7175 gfc_error ("Assignment to a FORALL index variable at %L",
7176 &code->expr1->where);
7179 /* If one of the FORALL index variables doesn't appear in the
7180 assignment variable, then there could be a many-to-one
7181 assignment. Emit a warning rather than an error because the
7182 mask could be resolving this problem. */
7183 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7184 gfc_warning ("The FORALL with index '%s' is not used on the "
7185 "left side of the assignment at %L and so might "
7186 "cause multiple assignment to this object",
7187 var_expr[n]->symtree->name, &code->expr1->where);
7193 /* Resolve WHERE statement in FORALL construct. */
7196 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7197 gfc_expr **var_expr)
7202 cblock = code->block;
7205 /* the assignment statement of a WHERE statement, or the first
7206 statement in where-body-construct of a WHERE construct */
7207 cnext = cblock->next;
7212 /* WHERE assignment statement */
7214 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7217 /* WHERE operator assignment statement */
7218 case EXEC_ASSIGN_CALL:
7219 resolve_call (cnext);
7220 if (!cnext->resolved_sym->attr.elemental)
7221 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7222 &cnext->ext.actual->expr->where);
7225 /* WHERE or WHERE construct is part of a where-body-construct */
7227 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7231 gfc_error ("Unsupported statement inside WHERE at %L",
7234 /* the next statement within the same where-body-construct */
7235 cnext = cnext->next;
7237 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7238 cblock = cblock->block;
7243 /* Traverse the FORALL body to check whether the following errors exist:
7244 1. For assignment, check if a many-to-one assignment happens.
7245 2. For WHERE statement, check the WHERE body to see if there is any
7246 many-to-one assignment. */
7249 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7253 c = code->block->next;
7259 case EXEC_POINTER_ASSIGN:
7260 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7263 case EXEC_ASSIGN_CALL:
7267 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7268 there is no need to handle it here. */
7272 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7277 /* The next statement in the FORALL body. */
7283 /* Counts the number of iterators needed inside a forall construct, including
7284 nested forall constructs. This is used to allocate the needed memory
7285 in gfc_resolve_forall. */
7288 gfc_count_forall_iterators (gfc_code *code)
7290 int max_iters, sub_iters, current_iters;
7291 gfc_forall_iterator *fa;
7293 gcc_assert(code->op == EXEC_FORALL);
7297 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7300 code = code->block->next;
7304 if (code->op == EXEC_FORALL)
7306 sub_iters = gfc_count_forall_iterators (code);
7307 if (sub_iters > max_iters)
7308 max_iters = sub_iters;
7313 return current_iters + max_iters;
7317 /* Given a FORALL construct, first resolve the FORALL iterator, then call
7318 gfc_resolve_forall_body to resolve the FORALL body. */
7321 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
7323 static gfc_expr **var_expr;
7324 static int total_var = 0;
7325 static int nvar = 0;
7327 gfc_forall_iterator *fa;
7332 /* Start to resolve a FORALL construct */
7333 if (forall_save == 0)
7335 /* Count the total number of FORALL index in the nested FORALL
7336 construct in order to allocate the VAR_EXPR with proper size. */
7337 total_var = gfc_count_forall_iterators (code);
7339 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
7340 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
7343 /* The information about FORALL iterator, including FORALL index start, end
7344 and stride. The FORALL index can not appear in start, end or stride. */
7345 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7347 /* Check if any outer FORALL index name is the same as the current
7349 for (i = 0; i < nvar; i++)
7351 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
7353 gfc_error ("An outer FORALL construct already has an index "
7354 "with this name %L", &fa->var->where);
7358 /* Record the current FORALL index. */
7359 var_expr[nvar] = gfc_copy_expr (fa->var);
7363 /* No memory leak. */
7364 gcc_assert (nvar <= total_var);
7367 /* Resolve the FORALL body. */
7368 gfc_resolve_forall_body (code, nvar, var_expr);
7370 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
7371 gfc_resolve_blocks (code->block, ns);
7375 /* Free only the VAR_EXPRs allocated in this frame. */
7376 for (i = nvar; i < tmp; i++)
7377 gfc_free_expr (var_expr[i]);
7381 /* We are in the outermost FORALL construct. */
7382 gcc_assert (forall_save == 0);
7384 /* VAR_EXPR is not needed any more. */
7385 gfc_free (var_expr);
7391 /* Resolve a BLOCK construct statement. */
7394 resolve_block_construct (gfc_code* code)
7396 /* Eventually, we may want to do some checks here or handle special stuff.
7397 But so far the only thing we can do is resolving the local namespace. */
7399 gfc_resolve (code->ext.ns);
7403 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
7406 static void resolve_code (gfc_code *, gfc_namespace *);
7409 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
7413 for (; b; b = b->block)
7415 t = gfc_resolve_expr (b->expr1);
7416 if (gfc_resolve_expr (b->expr2) == FAILURE)
7422 if (t == SUCCESS && b->expr1 != NULL
7423 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
7424 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7431 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
7432 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
7437 resolve_branch (b->label1, b);
7441 resolve_block_construct (b);
7445 case EXEC_SELECT_TYPE:
7455 case EXEC_OMP_ATOMIC:
7456 case EXEC_OMP_CRITICAL:
7458 case EXEC_OMP_MASTER:
7459 case EXEC_OMP_ORDERED:
7460 case EXEC_OMP_PARALLEL:
7461 case EXEC_OMP_PARALLEL_DO:
7462 case EXEC_OMP_PARALLEL_SECTIONS:
7463 case EXEC_OMP_PARALLEL_WORKSHARE:
7464 case EXEC_OMP_SECTIONS:
7465 case EXEC_OMP_SINGLE:
7467 case EXEC_OMP_TASKWAIT:
7468 case EXEC_OMP_WORKSHARE:
7472 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
7475 resolve_code (b->next, ns);
7480 /* Does everything to resolve an ordinary assignment. Returns true
7481 if this is an interface assignment. */
7483 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
7493 if (gfc_extend_assign (code, ns) == SUCCESS)
7495 gfc_symbol* assign_proc;
7498 if (code->op == EXEC_ASSIGN_CALL)
7500 lhs = code->ext.actual->expr;
7501 rhsptr = &code->ext.actual->next->expr;
7502 assign_proc = code->symtree->n.sym;
7506 gfc_actual_arglist* args;
7507 gfc_typebound_proc* tbp;
7509 gcc_assert (code->op == EXEC_COMPCALL);
7511 args = code->expr1->value.compcall.actual;
7513 rhsptr = &args->next->expr;
7515 tbp = code->expr1->value.compcall.tbp;
7516 gcc_assert (!tbp->is_generic);
7517 assign_proc = tbp->u.specific->n.sym;
7520 /* Make a temporary rhs when there is a default initializer
7521 and rhs is the same symbol as the lhs. */
7522 if ((*rhsptr)->expr_type == EXPR_VARIABLE
7523 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
7524 && has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
7525 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
7526 *rhsptr = gfc_get_parentheses (*rhsptr);
7535 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
7536 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
7537 &code->loc) == FAILURE)
7540 /* Handle the case of a BOZ literal on the RHS. */
7541 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
7544 if (gfc_option.warn_surprising)
7545 gfc_warning ("BOZ literal at %L is bitwise transferred "
7546 "non-integer symbol '%s'", &code->loc,
7547 lhs->symtree->n.sym->name);
7549 if (!gfc_convert_boz (rhs, &lhs->ts))
7551 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
7553 if (rc == ARITH_UNDERFLOW)
7554 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
7555 ". This check can be disabled with the option "
7556 "-fno-range-check", &rhs->where);
7557 else if (rc == ARITH_OVERFLOW)
7558 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
7559 ". This check can be disabled with the option "
7560 "-fno-range-check", &rhs->where);
7561 else if (rc == ARITH_NAN)
7562 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
7563 ". This check can be disabled with the option "
7564 "-fno-range-check", &rhs->where);
7570 if (lhs->ts.type == BT_CHARACTER
7571 && gfc_option.warn_character_truncation)
7573 if (lhs->ts.u.cl != NULL
7574 && lhs->ts.u.cl->length != NULL
7575 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7576 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
7578 if (rhs->expr_type == EXPR_CONSTANT)
7579 rlen = rhs->value.character.length;
7581 else if (rhs->ts.u.cl != NULL
7582 && rhs->ts.u.cl->length != NULL
7583 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7584 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
7586 if (rlen && llen && rlen > llen)
7587 gfc_warning_now ("CHARACTER expression will be truncated "
7588 "in assignment (%d/%d) at %L",
7589 llen, rlen, &code->loc);
7592 /* Ensure that a vector index expression for the lvalue is evaluated
7593 to a temporary if the lvalue symbol is referenced in it. */
7596 for (ref = lhs->ref; ref; ref= ref->next)
7597 if (ref->type == REF_ARRAY)
7599 for (n = 0; n < ref->u.ar.dimen; n++)
7600 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
7601 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
7602 ref->u.ar.start[n]))
7604 = gfc_get_parentheses (ref->u.ar.start[n]);
7608 if (gfc_pure (NULL))
7610 if (gfc_impure_variable (lhs->symtree->n.sym))
7612 gfc_error ("Cannot assign to variable '%s' in PURE "
7614 lhs->symtree->n.sym->name,
7619 if (lhs->ts.type == BT_DERIVED
7620 && lhs->expr_type == EXPR_VARIABLE
7621 && lhs->ts.u.derived->attr.pointer_comp
7622 && gfc_impure_variable (rhs->symtree->n.sym))
7624 gfc_error ("The impure variable at %L is assigned to "
7625 "a derived type variable with a POINTER "
7626 "component in a PURE procedure (12.6)",
7633 if (lhs->ts.type == BT_CLASS)
7635 gfc_error ("Variable must not be polymorphic in assignment at %L",
7640 gfc_check_assign (lhs, rhs, 1);
7645 /* Given a block of code, recursively resolve everything pointed to by this
7649 resolve_code (gfc_code *code, gfc_namespace *ns)
7651 int omp_workshare_save;
7656 frame.prev = cs_base;
7660 find_reachable_labels (code);
7662 for (; code; code = code->next)
7664 frame.current = code;
7665 forall_save = forall_flag;
7667 if (code->op == EXEC_FORALL)
7670 gfc_resolve_forall (code, ns, forall_save);
7673 else if (code->block)
7675 omp_workshare_save = -1;
7678 case EXEC_OMP_PARALLEL_WORKSHARE:
7679 omp_workshare_save = omp_workshare_flag;
7680 omp_workshare_flag = 1;
7681 gfc_resolve_omp_parallel_blocks (code, ns);
7683 case EXEC_OMP_PARALLEL:
7684 case EXEC_OMP_PARALLEL_DO:
7685 case EXEC_OMP_PARALLEL_SECTIONS:
7687 omp_workshare_save = omp_workshare_flag;
7688 omp_workshare_flag = 0;
7689 gfc_resolve_omp_parallel_blocks (code, ns);
7692 gfc_resolve_omp_do_blocks (code, ns);
7694 case EXEC_OMP_WORKSHARE:
7695 omp_workshare_save = omp_workshare_flag;
7696 omp_workshare_flag = 1;
7699 gfc_resolve_blocks (code->block, ns);
7703 if (omp_workshare_save != -1)
7704 omp_workshare_flag = omp_workshare_save;
7708 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
7709 t = gfc_resolve_expr (code->expr1);
7710 forall_flag = forall_save;
7712 if (gfc_resolve_expr (code->expr2) == FAILURE)
7718 case EXEC_END_BLOCK:
7725 case EXEC_ASSIGN_CALL:
7729 /* Keep track of which entry we are up to. */
7730 current_entry_id = code->ext.entry->id;
7734 resolve_where (code, NULL);
7738 if (code->expr1 != NULL)
7740 if (code->expr1->ts.type != BT_INTEGER)
7741 gfc_error ("ASSIGNED GOTO statement at %L requires an "
7742 "INTEGER variable", &code->expr1->where);
7743 else if (code->expr1->symtree->n.sym->attr.assign != 1)
7744 gfc_error ("Variable '%s' has not been assigned a target "
7745 "label at %L", code->expr1->symtree->n.sym->name,
7746 &code->expr1->where);
7749 resolve_branch (code->label1, code);
7753 if (code->expr1 != NULL
7754 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
7755 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
7756 "INTEGER return specifier", &code->expr1->where);
7759 case EXEC_INIT_ASSIGN:
7760 case EXEC_END_PROCEDURE:
7767 if (resolve_ordinary_assign (code, ns))
7769 if (code->op == EXEC_COMPCALL)
7776 case EXEC_LABEL_ASSIGN:
7777 if (code->label1->defined == ST_LABEL_UNKNOWN)
7778 gfc_error ("Label %d referenced at %L is never defined",
7779 code->label1->value, &code->label1->where);
7781 && (code->expr1->expr_type != EXPR_VARIABLE
7782 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
7783 || code->expr1->symtree->n.sym->ts.kind
7784 != gfc_default_integer_kind
7785 || code->expr1->symtree->n.sym->as != NULL))
7786 gfc_error ("ASSIGN statement at %L requires a scalar "
7787 "default INTEGER variable", &code->expr1->where);
7790 case EXEC_POINTER_ASSIGN:
7794 gfc_check_pointer_assign (code->expr1, code->expr2);
7797 case EXEC_ARITHMETIC_IF:
7799 && code->expr1->ts.type != BT_INTEGER
7800 && code->expr1->ts.type != BT_REAL)
7801 gfc_error ("Arithmetic IF statement at %L requires a numeric "
7802 "expression", &code->expr1->where);
7804 resolve_branch (code->label1, code);
7805 resolve_branch (code->label2, code);
7806 resolve_branch (code->label3, code);
7810 if (t == SUCCESS && code->expr1 != NULL
7811 && (code->expr1->ts.type != BT_LOGICAL
7812 || code->expr1->rank != 0))
7813 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7814 &code->expr1->where);
7819 resolve_call (code);
7824 if (code->expr1->symtree
7825 && code->expr1->symtree->n.sym->ts.type == BT_CLASS)
7826 resolve_class_typebound_call (code);
7828 resolve_typebound_call (code);
7832 resolve_ppc_call (code);
7836 /* Select is complicated. Also, a SELECT construct could be
7837 a transformed computed GOTO. */
7838 resolve_select (code);
7841 case EXEC_SELECT_TYPE:
7842 resolve_select_type (code);
7846 gfc_resolve (code->ext.ns);
7850 if (code->ext.iterator != NULL)
7852 gfc_iterator *iter = code->ext.iterator;
7853 if (gfc_resolve_iterator (iter, true) != FAILURE)
7854 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
7859 if (code->expr1 == NULL)
7860 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
7862 && (code->expr1->rank != 0
7863 || code->expr1->ts.type != BT_LOGICAL))
7864 gfc_error ("Exit condition of DO WHILE loop at %L must be "
7865 "a scalar LOGICAL expression", &code->expr1->where);
7870 resolve_allocate_deallocate (code, "ALLOCATE");
7874 case EXEC_DEALLOCATE:
7876 resolve_allocate_deallocate (code, "DEALLOCATE");
7881 if (gfc_resolve_open (code->ext.open) == FAILURE)
7884 resolve_branch (code->ext.open->err, code);
7888 if (gfc_resolve_close (code->ext.close) == FAILURE)
7891 resolve_branch (code->ext.close->err, code);
7894 case EXEC_BACKSPACE:
7898 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
7901 resolve_branch (code->ext.filepos->err, code);
7905 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7908 resolve_branch (code->ext.inquire->err, code);
7912 gcc_assert (code->ext.inquire != NULL);
7913 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7916 resolve_branch (code->ext.inquire->err, code);
7920 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
7923 resolve_branch (code->ext.wait->err, code);
7924 resolve_branch (code->ext.wait->end, code);
7925 resolve_branch (code->ext.wait->eor, code);
7930 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
7933 resolve_branch (code->ext.dt->err, code);
7934 resolve_branch (code->ext.dt->end, code);
7935 resolve_branch (code->ext.dt->eor, code);
7939 resolve_transfer (code);
7943 resolve_forall_iterators (code->ext.forall_iterator);
7945 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
7946 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
7947 "expression", &code->expr1->where);
7950 case EXEC_OMP_ATOMIC:
7951 case EXEC_OMP_BARRIER:
7952 case EXEC_OMP_CRITICAL:
7953 case EXEC_OMP_FLUSH:
7955 case EXEC_OMP_MASTER:
7956 case EXEC_OMP_ORDERED:
7957 case EXEC_OMP_SECTIONS:
7958 case EXEC_OMP_SINGLE:
7959 case EXEC_OMP_TASKWAIT:
7960 case EXEC_OMP_WORKSHARE:
7961 gfc_resolve_omp_directive (code, ns);
7964 case EXEC_OMP_PARALLEL:
7965 case EXEC_OMP_PARALLEL_DO:
7966 case EXEC_OMP_PARALLEL_SECTIONS:
7967 case EXEC_OMP_PARALLEL_WORKSHARE:
7969 omp_workshare_save = omp_workshare_flag;
7970 omp_workshare_flag = 0;
7971 gfc_resolve_omp_directive (code, ns);
7972 omp_workshare_flag = omp_workshare_save;
7976 gfc_internal_error ("resolve_code(): Bad statement code");
7980 cs_base = frame.prev;
7984 /* Resolve initial values and make sure they are compatible with
7988 resolve_values (gfc_symbol *sym)
7990 if (sym->value == NULL)
7993 if (gfc_resolve_expr (sym->value) == FAILURE)
7996 gfc_check_assign_symbol (sym, sym->value);
8000 /* Verify the binding labels for common blocks that are BIND(C). The label
8001 for a BIND(C) common block must be identical in all scoping units in which
8002 the common block is declared. Further, the binding label can not collide
8003 with any other global entity in the program. */
8006 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8008 if (comm_block_tree->n.common->is_bind_c == 1)
8010 gfc_gsymbol *binding_label_gsym;
8011 gfc_gsymbol *comm_name_gsym;
8013 /* See if a global symbol exists by the common block's name. It may
8014 be NULL if the common block is use-associated. */
8015 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8016 comm_block_tree->n.common->name);
8017 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8018 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8019 "with the global entity '%s' at %L",
8020 comm_block_tree->n.common->binding_label,
8021 comm_block_tree->n.common->name,
8022 &(comm_block_tree->n.common->where),
8023 comm_name_gsym->name, &(comm_name_gsym->where));
8024 else if (comm_name_gsym != NULL
8025 && strcmp (comm_name_gsym->name,
8026 comm_block_tree->n.common->name) == 0)
8028 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8030 if (comm_name_gsym->binding_label == NULL)
8031 /* No binding label for common block stored yet; save this one. */
8032 comm_name_gsym->binding_label =
8033 comm_block_tree->n.common->binding_label;
8035 if (strcmp (comm_name_gsym->binding_label,
8036 comm_block_tree->n.common->binding_label) != 0)
8038 /* Common block names match but binding labels do not. */
8039 gfc_error ("Binding label '%s' for common block '%s' at %L "
8040 "does not match the binding label '%s' for common "
8042 comm_block_tree->n.common->binding_label,
8043 comm_block_tree->n.common->name,
8044 &(comm_block_tree->n.common->where),
8045 comm_name_gsym->binding_label,
8046 comm_name_gsym->name,
8047 &(comm_name_gsym->where));
8052 /* There is no binding label (NAME="") so we have nothing further to
8053 check and nothing to add as a global symbol for the label. */
8054 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8057 binding_label_gsym =
8058 gfc_find_gsymbol (gfc_gsym_root,
8059 comm_block_tree->n.common->binding_label);
8060 if (binding_label_gsym == NULL)
8062 /* Need to make a global symbol for the binding label to prevent
8063 it from colliding with another. */
8064 binding_label_gsym =
8065 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8066 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8067 binding_label_gsym->type = GSYM_COMMON;
8071 /* If comm_name_gsym is NULL, the name common block is use
8072 associated and the name could be colliding. */
8073 if (binding_label_gsym->type != GSYM_COMMON)
8074 gfc_error ("Binding label '%s' for common block '%s' at %L "
8075 "collides with the global entity '%s' at %L",
8076 comm_block_tree->n.common->binding_label,
8077 comm_block_tree->n.common->name,
8078 &(comm_block_tree->n.common->where),
8079 binding_label_gsym->name,
8080 &(binding_label_gsym->where));
8081 else if (comm_name_gsym != NULL
8082 && (strcmp (binding_label_gsym->name,
8083 comm_name_gsym->binding_label) != 0)
8084 && (strcmp (binding_label_gsym->sym_name,
8085 comm_name_gsym->name) != 0))
8086 gfc_error ("Binding label '%s' for common block '%s' at %L "
8087 "collides with global entity '%s' at %L",
8088 binding_label_gsym->name, binding_label_gsym->sym_name,
8089 &(comm_block_tree->n.common->where),
8090 comm_name_gsym->name, &(comm_name_gsym->where));
8098 /* Verify any BIND(C) derived types in the namespace so we can report errors
8099 for them once, rather than for each variable declared of that type. */
8102 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8104 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8105 && derived_sym->attr.is_bind_c == 1)
8106 verify_bind_c_derived_type (derived_sym);
8112 /* Verify that any binding labels used in a given namespace do not collide
8113 with the names or binding labels of any global symbols. */
8116 gfc_verify_binding_labels (gfc_symbol *sym)
8120 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8121 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8123 gfc_gsymbol *bind_c_sym;
8125 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8126 if (bind_c_sym != NULL
8127 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8129 if (sym->attr.if_source == IFSRC_DECL
8130 && (bind_c_sym->type != GSYM_SUBROUTINE
8131 && bind_c_sym->type != GSYM_FUNCTION)
8132 && ((sym->attr.contained == 1
8133 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8134 || (sym->attr.use_assoc == 1
8135 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8137 /* Make sure global procedures don't collide with anything. */
8138 gfc_error ("Binding label '%s' at %L collides with the global "
8139 "entity '%s' at %L", sym->binding_label,
8140 &(sym->declared_at), bind_c_sym->name,
8141 &(bind_c_sym->where));
8144 else if (sym->attr.contained == 0
8145 && (sym->attr.if_source == IFSRC_IFBODY
8146 && sym->attr.flavor == FL_PROCEDURE)
8147 && (bind_c_sym->sym_name != NULL
8148 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8150 /* Make sure procedures in interface bodies don't collide. */
8151 gfc_error ("Binding label '%s' in interface body at %L collides "
8152 "with the global entity '%s' at %L",
8154 &(sym->declared_at), bind_c_sym->name,
8155 &(bind_c_sym->where));
8158 else if (sym->attr.contained == 0
8159 && sym->attr.if_source == IFSRC_UNKNOWN)
8160 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8161 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8162 || sym->attr.use_assoc == 0)
8164 gfc_error ("Binding label '%s' at %L collides with global "
8165 "entity '%s' at %L", sym->binding_label,
8166 &(sym->declared_at), bind_c_sym->name,
8167 &(bind_c_sym->where));
8172 /* Clear the binding label to prevent checking multiple times. */
8173 sym->binding_label[0] = '\0';
8175 else if (bind_c_sym == NULL)
8177 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8178 bind_c_sym->where = sym->declared_at;
8179 bind_c_sym->sym_name = sym->name;
8181 if (sym->attr.use_assoc == 1)
8182 bind_c_sym->mod_name = sym->module;
8184 if (sym->ns->proc_name != NULL)
8185 bind_c_sym->mod_name = sym->ns->proc_name->name;
8187 if (sym->attr.contained == 0)
8189 if (sym->attr.subroutine)
8190 bind_c_sym->type = GSYM_SUBROUTINE;
8191 else if (sym->attr.function)
8192 bind_c_sym->type = GSYM_FUNCTION;
8200 /* Resolve an index expression. */
8203 resolve_index_expr (gfc_expr *e)
8205 if (gfc_resolve_expr (e) == FAILURE)
8208 if (gfc_simplify_expr (e, 0) == FAILURE)
8211 if (gfc_specification_expr (e) == FAILURE)
8217 /* Resolve a charlen structure. */
8220 resolve_charlen (gfc_charlen *cl)
8229 specification_expr = 1;
8231 if (resolve_index_expr (cl->length) == FAILURE)
8233 specification_expr = 0;
8237 /* "If the character length parameter value evaluates to a negative
8238 value, the length of character entities declared is zero." */
8239 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8241 gfc_warning_now ("CHARACTER variable has zero length at %L",
8242 &cl->length->where);
8243 gfc_replace_expr (cl->length, gfc_int_expr (0));
8246 /* Check that the character length is not too large. */
8247 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8248 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8249 && cl->length->ts.type == BT_INTEGER
8250 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8252 gfc_error ("String length at %L is too large", &cl->length->where);
8260 /* Test for non-constant shape arrays. */
8263 is_non_constant_shape_array (gfc_symbol *sym)
8269 not_constant = false;
8270 if (sym->as != NULL)
8272 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
8273 has not been simplified; parameter array references. Do the
8274 simplification now. */
8275 for (i = 0; i < sym->as->rank; i++)
8277 e = sym->as->lower[i];
8278 if (e && (resolve_index_expr (e) == FAILURE
8279 || !gfc_is_constant_expr (e)))
8280 not_constant = true;
8282 e = sym->as->upper[i];
8283 if (e && (resolve_index_expr (e) == FAILURE
8284 || !gfc_is_constant_expr (e)))
8285 not_constant = true;
8288 return not_constant;
8291 /* Given a symbol and an initialization expression, add code to initialize
8292 the symbol to the function entry. */
8294 build_init_assign (gfc_symbol *sym, gfc_expr *init)
8298 gfc_namespace *ns = sym->ns;
8300 /* Search for the function namespace if this is a contained
8301 function without an explicit result. */
8302 if (sym->attr.function && sym == sym->result
8303 && sym->name != sym->ns->proc_name->name)
8306 for (;ns; ns = ns->sibling)
8307 if (strcmp (ns->proc_name->name, sym->name) == 0)
8313 gfc_free_expr (init);
8317 /* Build an l-value expression for the result. */
8318 lval = gfc_lval_expr_from_sym (sym);
8320 /* Add the code at scope entry. */
8321 init_st = gfc_get_code ();
8322 init_st->next = ns->code;
8325 /* Assign the default initializer to the l-value. */
8326 init_st->loc = sym->declared_at;
8327 init_st->op = EXEC_INIT_ASSIGN;
8328 init_st->expr1 = lval;
8329 init_st->expr2 = init;
8332 /* Assign the default initializer to a derived type variable or result. */
8335 apply_default_init (gfc_symbol *sym)
8337 gfc_expr *init = NULL;
8339 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8342 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
8343 init = gfc_default_initializer (&sym->ts);
8348 build_init_assign (sym, init);
8351 /* Build an initializer for a local integer, real, complex, logical, or
8352 character variable, based on the command line flags finit-local-zero,
8353 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
8354 null if the symbol should not have a default initialization. */
8356 build_default_init_expr (gfc_symbol *sym)
8359 gfc_expr *init_expr;
8362 /* These symbols should never have a default initialization. */
8363 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
8364 || sym->attr.external
8366 || sym->attr.pointer
8367 || sym->attr.in_equivalence
8368 || sym->attr.in_common
8371 || sym->attr.cray_pointee
8372 || sym->attr.cray_pointer)
8375 /* Now we'll try to build an initializer expression. */
8376 init_expr = gfc_get_expr ();
8377 init_expr->expr_type = EXPR_CONSTANT;
8378 init_expr->ts.type = sym->ts.type;
8379 init_expr->ts.kind = sym->ts.kind;
8380 init_expr->where = sym->declared_at;
8382 /* We will only initialize integers, reals, complex, logicals, and
8383 characters, and only if the corresponding command-line flags
8384 were set. Otherwise, we free init_expr and return null. */
8385 switch (sym->ts.type)
8388 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
8389 mpz_init_set_si (init_expr->value.integer,
8390 gfc_option.flag_init_integer_value);
8393 gfc_free_expr (init_expr);
8399 mpfr_init (init_expr->value.real);
8400 switch (gfc_option.flag_init_real)
8402 case GFC_INIT_REAL_SNAN:
8403 init_expr->is_snan = 1;
8405 case GFC_INIT_REAL_NAN:
8406 mpfr_set_nan (init_expr->value.real);
8409 case GFC_INIT_REAL_INF:
8410 mpfr_set_inf (init_expr->value.real, 1);
8413 case GFC_INIT_REAL_NEG_INF:
8414 mpfr_set_inf (init_expr->value.real, -1);
8417 case GFC_INIT_REAL_ZERO:
8418 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
8422 gfc_free_expr (init_expr);
8430 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
8432 mpfr_init (init_expr->value.complex.r);
8433 mpfr_init (init_expr->value.complex.i);
8435 switch (gfc_option.flag_init_real)
8437 case GFC_INIT_REAL_SNAN:
8438 init_expr->is_snan = 1;
8440 case GFC_INIT_REAL_NAN:
8441 mpfr_set_nan (mpc_realref (init_expr->value.complex));
8442 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
8445 case GFC_INIT_REAL_INF:
8446 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
8447 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
8450 case GFC_INIT_REAL_NEG_INF:
8451 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
8452 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
8455 case GFC_INIT_REAL_ZERO:
8457 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
8459 mpfr_set_ui (init_expr->value.complex.r, 0.0, GFC_RND_MODE);
8460 mpfr_set_ui (init_expr->value.complex.i, 0.0, GFC_RND_MODE);
8465 gfc_free_expr (init_expr);
8472 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
8473 init_expr->value.logical = 0;
8474 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
8475 init_expr->value.logical = 1;
8478 gfc_free_expr (init_expr);
8484 /* For characters, the length must be constant in order to
8485 create a default initializer. */
8486 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
8487 && sym->ts.u.cl->length
8488 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8490 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
8491 init_expr->value.character.length = char_len;
8492 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
8493 for (i = 0; i < char_len; i++)
8494 init_expr->value.character.string[i]
8495 = (unsigned char) gfc_option.flag_init_character_value;
8499 gfc_free_expr (init_expr);
8505 gfc_free_expr (init_expr);
8511 /* Add an initialization expression to a local variable. */
8513 apply_default_init_local (gfc_symbol *sym)
8515 gfc_expr *init = NULL;
8517 /* The symbol should be a variable or a function return value. */
8518 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8519 || (sym->attr.function && sym->result != sym))
8522 /* Try to build the initializer expression. If we can't initialize
8523 this symbol, then init will be NULL. */
8524 init = build_default_init_expr (sym);
8528 /* For saved variables, we don't want to add an initializer at
8529 function entry, so we just add a static initializer. */
8530 if (sym->attr.save || sym->ns->save_all)
8532 /* Don't clobber an existing initializer! */
8533 gcc_assert (sym->value == NULL);
8538 build_init_assign (sym, init);
8541 /* Resolution of common features of flavors variable and procedure. */
8544 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
8546 /* Constraints on deferred shape variable. */
8547 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
8549 if (sym->attr.allocatable)
8551 if (sym->attr.dimension)
8553 gfc_error ("Allocatable array '%s' at %L must have "
8554 "a deferred shape", sym->name, &sym->declared_at);
8557 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
8558 "may not be ALLOCATABLE", sym->name,
8559 &sym->declared_at) == FAILURE)
8563 if (sym->attr.pointer && sym->attr.dimension)
8565 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
8566 sym->name, &sym->declared_at);
8573 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
8574 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
8576 gfc_error ("Array '%s' at %L cannot have a deferred shape",
8577 sym->name, &sym->declared_at);
8585 /* Additional checks for symbols with flavor variable and derived
8586 type. To be called from resolve_fl_variable. */
8589 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
8591 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
8593 /* Check to see if a derived type is blocked from being host
8594 associated by the presence of another class I symbol in the same
8595 namespace. 14.6.1.3 of the standard and the discussion on
8596 comp.lang.fortran. */
8597 if (sym->ns != sym->ts.u.derived->ns
8598 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
8601 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
8602 if (s && s->attr.flavor != FL_DERIVED)
8604 gfc_error ("The type '%s' cannot be host associated at %L "
8605 "because it is blocked by an incompatible object "
8606 "of the same name declared at %L",
8607 sym->ts.u.derived->name, &sym->declared_at,
8613 /* 4th constraint in section 11.3: "If an object of a type for which
8614 component-initialization is specified (R429) appears in the
8615 specification-part of a module and does not have the ALLOCATABLE
8616 or POINTER attribute, the object shall have the SAVE attribute."
8618 The check for initializers is performed with
8619 has_default_initializer because gfc_default_initializer generates
8620 a hidden default for allocatable components. */
8621 if (!(sym->value || no_init_flag) && sym->ns->proc_name
8622 && sym->ns->proc_name->attr.flavor == FL_MODULE
8623 && !sym->ns->save_all && !sym->attr.save
8624 && !sym->attr.pointer && !sym->attr.allocatable
8625 && has_default_initializer (sym->ts.u.derived))
8627 gfc_error("Object '%s' at %L must have the SAVE attribute for "
8628 "default initialization of a component",
8629 sym->name, &sym->declared_at);
8633 if (sym->ts.type == BT_CLASS)
8636 if (!gfc_type_is_extensible (sym->ts.u.derived->components->ts.u.derived))
8638 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
8639 sym->ts.u.derived->name, sym->name, &sym->declared_at);
8644 if (!(sym->attr.dummy || sym->attr.allocatable || sym->attr.pointer
8645 || sym->ts.u.derived->components->attr.allocatable
8646 || sym->ts.u.derived->components->attr.pointer))
8648 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
8649 "or pointer", sym->name, &sym->declared_at);
8654 /* Assign default initializer. */
8655 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
8656 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
8658 sym->value = gfc_default_initializer (&sym->ts);
8665 /* Resolve symbols with flavor variable. */
8668 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
8670 int no_init_flag, automatic_flag;
8672 const char *auto_save_msg;
8674 auto_save_msg = "Automatic object '%s' at %L cannot have the "
8677 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8680 /* Set this flag to check that variables are parameters of all entries.
8681 This check is effected by the call to gfc_resolve_expr through
8682 is_non_constant_shape_array. */
8683 specification_expr = 1;
8685 if (sym->ns->proc_name
8686 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8687 || sym->ns->proc_name->attr.is_main_program)
8688 && !sym->attr.use_assoc
8689 && !sym->attr.allocatable
8690 && !sym->attr.pointer
8691 && is_non_constant_shape_array (sym))
8693 /* The shape of a main program or module array needs to be
8695 gfc_error ("The module or main program array '%s' at %L must "
8696 "have constant shape", sym->name, &sym->declared_at);
8697 specification_expr = 0;
8701 if (sym->ts.type == BT_CHARACTER)
8703 /* Make sure that character string variables with assumed length are
8705 e = sym->ts.u.cl->length;
8706 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
8708 gfc_error ("Entity with assumed character length at %L must be a "
8709 "dummy argument or a PARAMETER", &sym->declared_at);
8713 if (e && sym->attr.save && !gfc_is_constant_expr (e))
8715 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8719 if (!gfc_is_constant_expr (e)
8720 && !(e->expr_type == EXPR_VARIABLE
8721 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
8722 && sym->ns->proc_name
8723 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8724 || sym->ns->proc_name->attr.is_main_program)
8725 && !sym->attr.use_assoc)
8727 gfc_error ("'%s' at %L must have constant character length "
8728 "in this context", sym->name, &sym->declared_at);
8733 if (sym->value == NULL && sym->attr.referenced)
8734 apply_default_init_local (sym); /* Try to apply a default initialization. */
8736 /* Determine if the symbol may not have an initializer. */
8737 no_init_flag = automatic_flag = 0;
8738 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
8739 || sym->attr.intrinsic || sym->attr.result)
8741 else if (sym->attr.dimension && !sym->attr.pointer
8742 && is_non_constant_shape_array (sym))
8744 no_init_flag = automatic_flag = 1;
8746 /* Also, they must not have the SAVE attribute.
8747 SAVE_IMPLICIT is checked below. */
8748 if (sym->attr.save == SAVE_EXPLICIT)
8750 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8755 /* Ensure that any initializer is simplified. */
8757 gfc_simplify_expr (sym->value, 1);
8759 /* Reject illegal initializers. */
8760 if (!sym->mark && sym->value)
8762 if (sym->attr.allocatable)
8763 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
8764 sym->name, &sym->declared_at);
8765 else if (sym->attr.external)
8766 gfc_error ("External '%s' at %L cannot have an initializer",
8767 sym->name, &sym->declared_at);
8768 else if (sym->attr.dummy
8769 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
8770 gfc_error ("Dummy '%s' at %L cannot have an initializer",
8771 sym->name, &sym->declared_at);
8772 else if (sym->attr.intrinsic)
8773 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
8774 sym->name, &sym->declared_at);
8775 else if (sym->attr.result)
8776 gfc_error ("Function result '%s' at %L cannot have an initializer",
8777 sym->name, &sym->declared_at);
8778 else if (automatic_flag)
8779 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
8780 sym->name, &sym->declared_at);
8787 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
8788 return resolve_fl_variable_derived (sym, no_init_flag);
8794 /* Resolve a procedure. */
8797 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
8799 gfc_formal_arglist *arg;
8801 if (sym->attr.ambiguous_interfaces && !sym->attr.referenced)
8802 gfc_warning ("Although not referenced, '%s' at %L has ambiguous "
8803 "interfaces", sym->name, &sym->declared_at);
8805 if (sym->attr.function
8806 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8809 if (sym->ts.type == BT_CHARACTER)
8811 gfc_charlen *cl = sym->ts.u.cl;
8813 if (cl && cl->length && gfc_is_constant_expr (cl->length)
8814 && resolve_charlen (cl) == FAILURE)
8817 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
8819 if (sym->attr.proc == PROC_ST_FUNCTION)
8821 gfc_error ("Character-valued statement function '%s' at %L must "
8822 "have constant length", sym->name, &sym->declared_at);
8826 if (sym->attr.external && sym->formal == NULL
8827 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
8829 gfc_error ("Automatic character length function '%s' at %L must "
8830 "have an explicit interface", sym->name,
8837 /* Ensure that derived type for are not of a private type. Internal
8838 module procedures are excluded by 2.2.3.3 - i.e., they are not
8839 externally accessible and can access all the objects accessible in
8841 if (!(sym->ns->parent
8842 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
8843 && gfc_check_access(sym->attr.access, sym->ns->default_access))
8845 gfc_interface *iface;
8847 for (arg = sym->formal; arg; arg = arg->next)
8850 && arg->sym->ts.type == BT_DERIVED
8851 && !arg->sym->ts.u.derived->attr.use_assoc
8852 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
8853 arg->sym->ts.u.derived->ns->default_access)
8854 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
8855 "PRIVATE type and cannot be a dummy argument"
8856 " of '%s', which is PUBLIC at %L",
8857 arg->sym->name, sym->name, &sym->declared_at)
8860 /* Stop this message from recurring. */
8861 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
8866 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8867 PRIVATE to the containing module. */
8868 for (iface = sym->generic; iface; iface = iface->next)
8870 for (arg = iface->sym->formal; arg; arg = arg->next)
8873 && arg->sym->ts.type == BT_DERIVED
8874 && !arg->sym->ts.u.derived->attr.use_assoc
8875 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
8876 arg->sym->ts.u.derived->ns->default_access)
8877 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8878 "'%s' in PUBLIC interface '%s' at %L "
8879 "takes dummy arguments of '%s' which is "
8880 "PRIVATE", iface->sym->name, sym->name,
8881 &iface->sym->declared_at,
8882 gfc_typename (&arg->sym->ts)) == FAILURE)
8884 /* Stop this message from recurring. */
8885 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
8891 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8892 PRIVATE to the containing module. */
8893 for (iface = sym->generic; iface; iface = iface->next)
8895 for (arg = iface->sym->formal; arg; arg = arg->next)
8898 && arg->sym->ts.type == BT_DERIVED
8899 && !arg->sym->ts.u.derived->attr.use_assoc
8900 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
8901 arg->sym->ts.u.derived->ns->default_access)
8902 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8903 "'%s' in PUBLIC interface '%s' at %L "
8904 "takes dummy arguments of '%s' which is "
8905 "PRIVATE", iface->sym->name, sym->name,
8906 &iface->sym->declared_at,
8907 gfc_typename (&arg->sym->ts)) == FAILURE)
8909 /* Stop this message from recurring. */
8910 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
8917 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
8918 && !sym->attr.proc_pointer)
8920 gfc_error ("Function '%s' at %L cannot have an initializer",
8921 sym->name, &sym->declared_at);
8925 /* An external symbol may not have an initializer because it is taken to be
8926 a procedure. Exception: Procedure Pointers. */
8927 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
8929 gfc_error ("External object '%s' at %L may not have an initializer",
8930 sym->name, &sym->declared_at);
8934 /* An elemental function is required to return a scalar 12.7.1 */
8935 if (sym->attr.elemental && sym->attr.function && sym->as)
8937 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
8938 "result", sym->name, &sym->declared_at);
8939 /* Reset so that the error only occurs once. */
8940 sym->attr.elemental = 0;
8944 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
8945 char-len-param shall not be array-valued, pointer-valued, recursive
8946 or pure. ....snip... A character value of * may only be used in the
8947 following ways: (i) Dummy arg of procedure - dummy associates with
8948 actual length; (ii) To declare a named constant; or (iii) External
8949 function - but length must be declared in calling scoping unit. */
8950 if (sym->attr.function
8951 && sym->ts.type == BT_CHARACTER
8952 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
8954 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
8955 || (sym->attr.recursive) || (sym->attr.pure))
8957 if (sym->as && sym->as->rank)
8958 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8959 "array-valued", sym->name, &sym->declared_at);
8961 if (sym->attr.pointer)
8962 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8963 "pointer-valued", sym->name, &sym->declared_at);
8966 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8967 "pure", sym->name, &sym->declared_at);
8969 if (sym->attr.recursive)
8970 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8971 "recursive", sym->name, &sym->declared_at);
8976 /* Appendix B.2 of the standard. Contained functions give an
8977 error anyway. Fixed-form is likely to be F77/legacy. */
8978 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
8979 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
8980 "CHARACTER(*) function '%s' at %L",
8981 sym->name, &sym->declared_at);
8984 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
8986 gfc_formal_arglist *curr_arg;
8987 int has_non_interop_arg = 0;
8989 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
8990 sym->common_block) == FAILURE)
8992 /* Clear these to prevent looking at them again if there was an
8994 sym->attr.is_bind_c = 0;
8995 sym->attr.is_c_interop = 0;
8996 sym->ts.is_c_interop = 0;
9000 /* So far, no errors have been found. */
9001 sym->attr.is_c_interop = 1;
9002 sym->ts.is_c_interop = 1;
9005 curr_arg = sym->formal;
9006 while (curr_arg != NULL)
9008 /* Skip implicitly typed dummy args here. */
9009 if (curr_arg->sym->attr.implicit_type == 0)
9010 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9011 /* If something is found to fail, record the fact so we
9012 can mark the symbol for the procedure as not being
9013 BIND(C) to try and prevent multiple errors being
9015 has_non_interop_arg = 1;
9017 curr_arg = curr_arg->next;
9020 /* See if any of the arguments were not interoperable and if so, clear
9021 the procedure symbol to prevent duplicate error messages. */
9022 if (has_non_interop_arg != 0)
9024 sym->attr.is_c_interop = 0;
9025 sym->ts.is_c_interop = 0;
9026 sym->attr.is_bind_c = 0;
9030 if (!sym->attr.proc_pointer)
9032 if (sym->attr.save == SAVE_EXPLICIT)
9034 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9035 "in '%s' at %L", sym->name, &sym->declared_at);
9038 if (sym->attr.intent)
9040 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9041 "in '%s' at %L", sym->name, &sym->declared_at);
9044 if (sym->attr.subroutine && sym->attr.result)
9046 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9047 "in '%s' at %L", sym->name, &sym->declared_at);
9050 if (sym->attr.external && sym->attr.function
9051 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9052 || sym->attr.contained))
9054 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9055 "in '%s' at %L", sym->name, &sym->declared_at);
9058 if (strcmp ("ppr@", sym->name) == 0)
9060 gfc_error ("Procedure pointer result '%s' at %L "
9061 "is missing the pointer attribute",
9062 sym->ns->proc_name->name, &sym->declared_at);
9071 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9072 been defined and we now know their defined arguments, check that they fulfill
9073 the requirements of the standard for procedures used as finalizers. */
9076 gfc_resolve_finalizers (gfc_symbol* derived)
9078 gfc_finalizer* list;
9079 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9080 gfc_try result = SUCCESS;
9081 bool seen_scalar = false;
9083 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9086 /* Walk over the list of finalizer-procedures, check them, and if any one
9087 does not fit in with the standard's definition, print an error and remove
9088 it from the list. */
9089 prev_link = &derived->f2k_derived->finalizers;
9090 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9096 /* Skip this finalizer if we already resolved it. */
9097 if (list->proc_tree)
9099 prev_link = &(list->next);
9103 /* Check this exists and is a SUBROUTINE. */
9104 if (!list->proc_sym->attr.subroutine)
9106 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9107 list->proc_sym->name, &list->where);
9111 /* We should have exactly one argument. */
9112 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9114 gfc_error ("FINAL procedure at %L must have exactly one argument",
9118 arg = list->proc_sym->formal->sym;
9120 /* This argument must be of our type. */
9121 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9123 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9124 &arg->declared_at, derived->name);
9128 /* It must neither be a pointer nor allocatable nor optional. */
9129 if (arg->attr.pointer)
9131 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9135 if (arg->attr.allocatable)
9137 gfc_error ("Argument of FINAL procedure at %L must not be"
9138 " ALLOCATABLE", &arg->declared_at);
9141 if (arg->attr.optional)
9143 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9148 /* It must not be INTENT(OUT). */
9149 if (arg->attr.intent == INTENT_OUT)
9151 gfc_error ("Argument of FINAL procedure at %L must not be"
9152 " INTENT(OUT)", &arg->declared_at);
9156 /* Warn if the procedure is non-scalar and not assumed shape. */
9157 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9158 && arg->as->type != AS_ASSUMED_SHAPE)
9159 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9160 " shape argument", &arg->declared_at);
9162 /* Check that it does not match in kind and rank with a FINAL procedure
9163 defined earlier. To really loop over the *earlier* declarations,
9164 we need to walk the tail of the list as new ones were pushed at the
9166 /* TODO: Handle kind parameters once they are implemented. */
9167 my_rank = (arg->as ? arg->as->rank : 0);
9168 for (i = list->next; i; i = i->next)
9170 /* Argument list might be empty; that is an error signalled earlier,
9171 but we nevertheless continued resolving. */
9172 if (i->proc_sym->formal)
9174 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9175 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9176 if (i_rank == my_rank)
9178 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9179 " rank (%d) as '%s'",
9180 list->proc_sym->name, &list->where, my_rank,
9187 /* Is this the/a scalar finalizer procedure? */
9188 if (!arg->as || arg->as->rank == 0)
9191 /* Find the symtree for this procedure. */
9192 gcc_assert (!list->proc_tree);
9193 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9195 prev_link = &list->next;
9198 /* Remove wrong nodes immediately from the list so we don't risk any
9199 troubles in the future when they might fail later expectations. */
9203 *prev_link = list->next;
9204 gfc_free_finalizer (i);
9207 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9208 were nodes in the list, must have been for arrays. It is surely a good
9209 idea to have a scalar version there if there's something to finalize. */
9210 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9211 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9212 " defined at %L, suggest also scalar one",
9213 derived->name, &derived->declared_at);
9215 /* TODO: Remove this error when finalization is finished. */
9216 gfc_error ("Finalization at %L is not yet implemented",
9217 &derived->declared_at);
9223 /* Check that it is ok for the typebound procedure proc to override the
9227 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9230 const gfc_symbol* proc_target;
9231 const gfc_symbol* old_target;
9232 unsigned proc_pass_arg, old_pass_arg, argpos;
9233 gfc_formal_arglist* proc_formal;
9234 gfc_formal_arglist* old_formal;
9236 /* This procedure should only be called for non-GENERIC proc. */
9237 gcc_assert (!proc->n.tb->is_generic);
9239 /* If the overwritten procedure is GENERIC, this is an error. */
9240 if (old->n.tb->is_generic)
9242 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9243 old->name, &proc->n.tb->where);
9247 where = proc->n.tb->where;
9248 proc_target = proc->n.tb->u.specific->n.sym;
9249 old_target = old->n.tb->u.specific->n.sym;
9251 /* Check that overridden binding is not NON_OVERRIDABLE. */
9252 if (old->n.tb->non_overridable)
9254 gfc_error ("'%s' at %L overrides a procedure binding declared"
9255 " NON_OVERRIDABLE", proc->name, &where);
9259 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9260 if (!old->n.tb->deferred && proc->n.tb->deferred)
9262 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9263 " non-DEFERRED binding", proc->name, &where);
9267 /* If the overridden binding is PURE, the overriding must be, too. */
9268 if (old_target->attr.pure && !proc_target->attr.pure)
9270 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9271 proc->name, &where);
9275 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9276 is not, the overriding must not be either. */
9277 if (old_target->attr.elemental && !proc_target->attr.elemental)
9279 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
9280 " ELEMENTAL", proc->name, &where);
9283 if (!old_target->attr.elemental && proc_target->attr.elemental)
9285 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
9286 " be ELEMENTAL, either", proc->name, &where);
9290 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
9292 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
9294 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
9295 " SUBROUTINE", proc->name, &where);
9299 /* If the overridden binding is a FUNCTION, the overriding must also be a
9300 FUNCTION and have the same characteristics. */
9301 if (old_target->attr.function)
9303 if (!proc_target->attr.function)
9305 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
9306 " FUNCTION", proc->name, &where);
9310 /* FIXME: Do more comprehensive checking (including, for instance, the
9311 rank and array-shape). */
9312 gcc_assert (proc_target->result && old_target->result);
9313 if (!gfc_compare_types (&proc_target->result->ts,
9314 &old_target->result->ts))
9316 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
9317 " matching result types", proc->name, &where);
9322 /* If the overridden binding is PUBLIC, the overriding one must not be
9324 if (old->n.tb->access == ACCESS_PUBLIC
9325 && proc->n.tb->access == ACCESS_PRIVATE)
9327 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
9328 " PRIVATE", proc->name, &where);
9332 /* Compare the formal argument lists of both procedures. This is also abused
9333 to find the position of the passed-object dummy arguments of both
9334 bindings as at least the overridden one might not yet be resolved and we
9335 need those positions in the check below. */
9336 proc_pass_arg = old_pass_arg = 0;
9337 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
9339 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
9342 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
9343 proc_formal && old_formal;
9344 proc_formal = proc_formal->next, old_formal = old_formal->next)
9346 if (proc->n.tb->pass_arg
9347 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
9348 proc_pass_arg = argpos;
9349 if (old->n.tb->pass_arg
9350 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
9351 old_pass_arg = argpos;
9353 /* Check that the names correspond. */
9354 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
9356 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
9357 " to match the corresponding argument of the overridden"
9358 " procedure", proc_formal->sym->name, proc->name, &where,
9359 old_formal->sym->name);
9363 /* Check that the types correspond if neither is the passed-object
9365 /* FIXME: Do more comprehensive testing here. */
9366 if (proc_pass_arg != argpos && old_pass_arg != argpos
9367 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
9369 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L in"
9370 " in respect to the overridden procedure",
9371 proc_formal->sym->name, proc->name, &where);
9377 if (proc_formal || old_formal)
9379 gfc_error ("'%s' at %L must have the same number of formal arguments as"
9380 " the overridden procedure", proc->name, &where);
9384 /* If the overridden binding is NOPASS, the overriding one must also be
9386 if (old->n.tb->nopass && !proc->n.tb->nopass)
9388 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
9389 " NOPASS", proc->name, &where);
9393 /* If the overridden binding is PASS(x), the overriding one must also be
9394 PASS and the passed-object dummy arguments must correspond. */
9395 if (!old->n.tb->nopass)
9397 if (proc->n.tb->nopass)
9399 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
9400 " PASS", proc->name, &where);
9404 if (proc_pass_arg != old_pass_arg)
9406 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
9407 " the same position as the passed-object dummy argument of"
9408 " the overridden procedure", proc->name, &where);
9417 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
9420 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
9421 const char* generic_name, locus where)
9426 gcc_assert (t1->specific && t2->specific);
9427 gcc_assert (!t1->specific->is_generic);
9428 gcc_assert (!t2->specific->is_generic);
9430 sym1 = t1->specific->u.specific->n.sym;
9431 sym2 = t2->specific->u.specific->n.sym;
9436 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
9437 if (sym1->attr.subroutine != sym2->attr.subroutine
9438 || sym1->attr.function != sym2->attr.function)
9440 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
9441 " GENERIC '%s' at %L",
9442 sym1->name, sym2->name, generic_name, &where);
9446 /* Compare the interfaces. */
9447 if (gfc_compare_interfaces (sym1, sym2, NULL, 1, 0, NULL, 0))
9449 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
9450 sym1->name, sym2->name, generic_name, &where);
9458 /* Worker function for resolving a generic procedure binding; this is used to
9459 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
9461 The difference between those cases is finding possible inherited bindings
9462 that are overridden, as one has to look for them in tb_sym_root,
9463 tb_uop_root or tb_op, respectively. Thus the caller must already find
9464 the super-type and set p->overridden correctly. */
9467 resolve_tb_generic_targets (gfc_symbol* super_type,
9468 gfc_typebound_proc* p, const char* name)
9470 gfc_tbp_generic* target;
9471 gfc_symtree* first_target;
9472 gfc_symtree* inherited;
9474 gcc_assert (p && p->is_generic);
9476 /* Try to find the specific bindings for the symtrees in our target-list. */
9477 gcc_assert (p->u.generic);
9478 for (target = p->u.generic; target; target = target->next)
9479 if (!target->specific)
9481 gfc_typebound_proc* overridden_tbp;
9483 const char* target_name;
9485 target_name = target->specific_st->name;
9487 /* Defined for this type directly. */
9488 if (target->specific_st->n.tb)
9490 target->specific = target->specific_st->n.tb;
9491 goto specific_found;
9494 /* Look for an inherited specific binding. */
9497 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
9502 gcc_assert (inherited->n.tb);
9503 target->specific = inherited->n.tb;
9504 goto specific_found;
9508 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
9509 " at %L", target_name, name, &p->where);
9512 /* Once we've found the specific binding, check it is not ambiguous with
9513 other specifics already found or inherited for the same GENERIC. */
9515 gcc_assert (target->specific);
9517 /* This must really be a specific binding! */
9518 if (target->specific->is_generic)
9520 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
9521 " '%s' is GENERIC, too", name, &p->where, target_name);
9525 /* Check those already resolved on this type directly. */
9526 for (g = p->u.generic; g; g = g->next)
9527 if (g != target && g->specific
9528 && check_generic_tbp_ambiguity (target, g, name, p->where)
9532 /* Check for ambiguity with inherited specific targets. */
9533 for (overridden_tbp = p->overridden; overridden_tbp;
9534 overridden_tbp = overridden_tbp->overridden)
9535 if (overridden_tbp->is_generic)
9537 for (g = overridden_tbp->u.generic; g; g = g->next)
9539 gcc_assert (g->specific);
9540 if (check_generic_tbp_ambiguity (target, g,
9541 name, p->where) == FAILURE)
9547 /* If we attempt to "overwrite" a specific binding, this is an error. */
9548 if (p->overridden && !p->overridden->is_generic)
9550 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
9551 " the same name", name, &p->where);
9555 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
9556 all must have the same attributes here. */
9557 first_target = p->u.generic->specific->u.specific;
9558 gcc_assert (first_target);
9559 p->subroutine = first_target->n.sym->attr.subroutine;
9560 p->function = first_target->n.sym->attr.function;
9566 /* Resolve a GENERIC procedure binding for a derived type. */
9569 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
9571 gfc_symbol* super_type;
9573 /* Find the overridden binding if any. */
9574 st->n.tb->overridden = NULL;
9575 super_type = gfc_get_derived_super_type (derived);
9578 gfc_symtree* overridden;
9579 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
9582 if (overridden && overridden->n.tb)
9583 st->n.tb->overridden = overridden->n.tb;
9586 /* Resolve using worker function. */
9587 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
9591 /* Retrieve the target-procedure of an operator binding and do some checks in
9592 common for intrinsic and user-defined type-bound operators. */
9595 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
9597 gfc_symbol* target_proc;
9599 gcc_assert (target->specific && !target->specific->is_generic);
9600 target_proc = target->specific->u.specific->n.sym;
9601 gcc_assert (target_proc);
9603 /* All operator bindings must have a passed-object dummy argument. */
9604 if (target->specific->nopass)
9606 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
9614 /* Resolve a type-bound intrinsic operator. */
9617 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
9618 gfc_typebound_proc* p)
9620 gfc_symbol* super_type;
9621 gfc_tbp_generic* target;
9623 /* If there's already an error here, do nothing (but don't fail again). */
9627 /* Operators should always be GENERIC bindings. */
9628 gcc_assert (p->is_generic);
9630 /* Look for an overridden binding. */
9631 super_type = gfc_get_derived_super_type (derived);
9632 if (super_type && super_type->f2k_derived)
9633 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
9636 p->overridden = NULL;
9638 /* Resolve general GENERIC properties using worker function. */
9639 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
9642 /* Check the targets to be procedures of correct interface. */
9643 for (target = p->u.generic; target; target = target->next)
9645 gfc_symbol* target_proc;
9647 target_proc = get_checked_tb_operator_target (target, p->where);
9651 if (!gfc_check_operator_interface (target_proc, op, p->where))
9663 /* Resolve a type-bound user operator (tree-walker callback). */
9665 static gfc_symbol* resolve_bindings_derived;
9666 static gfc_try resolve_bindings_result;
9668 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
9671 resolve_typebound_user_op (gfc_symtree* stree)
9673 gfc_symbol* super_type;
9674 gfc_tbp_generic* target;
9676 gcc_assert (stree && stree->n.tb);
9678 if (stree->n.tb->error)
9681 /* Operators should always be GENERIC bindings. */
9682 gcc_assert (stree->n.tb->is_generic);
9684 /* Find overridden procedure, if any. */
9685 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9686 if (super_type && super_type->f2k_derived)
9688 gfc_symtree* overridden;
9689 overridden = gfc_find_typebound_user_op (super_type, NULL,
9690 stree->name, true, NULL);
9692 if (overridden && overridden->n.tb)
9693 stree->n.tb->overridden = overridden->n.tb;
9696 stree->n.tb->overridden = NULL;
9698 /* Resolve basically using worker function. */
9699 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
9703 /* Check the targets to be functions of correct interface. */
9704 for (target = stree->n.tb->u.generic; target; target = target->next)
9706 gfc_symbol* target_proc;
9708 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
9712 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
9719 resolve_bindings_result = FAILURE;
9720 stree->n.tb->error = 1;
9724 /* Resolve the type-bound procedures for a derived type. */
9727 resolve_typebound_procedure (gfc_symtree* stree)
9732 gfc_symbol* super_type;
9733 gfc_component* comp;
9737 /* Undefined specific symbol from GENERIC target definition. */
9741 if (stree->n.tb->error)
9744 /* If this is a GENERIC binding, use that routine. */
9745 if (stree->n.tb->is_generic)
9747 if (resolve_typebound_generic (resolve_bindings_derived, stree)
9753 /* Get the target-procedure to check it. */
9754 gcc_assert (!stree->n.tb->is_generic);
9755 gcc_assert (stree->n.tb->u.specific);
9756 proc = stree->n.tb->u.specific->n.sym;
9757 where = stree->n.tb->where;
9759 /* Default access should already be resolved from the parser. */
9760 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
9762 /* It should be a module procedure or an external procedure with explicit
9763 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
9764 if ((!proc->attr.subroutine && !proc->attr.function)
9765 || (proc->attr.proc != PROC_MODULE
9766 && proc->attr.if_source != IFSRC_IFBODY)
9767 || (proc->attr.abstract && !stree->n.tb->deferred))
9769 gfc_error ("'%s' must be a module procedure or an external procedure with"
9770 " an explicit interface at %L", proc->name, &where);
9773 stree->n.tb->subroutine = proc->attr.subroutine;
9774 stree->n.tb->function = proc->attr.function;
9776 /* Find the super-type of the current derived type. We could do this once and
9777 store in a global if speed is needed, but as long as not I believe this is
9778 more readable and clearer. */
9779 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9781 /* If PASS, resolve and check arguments if not already resolved / loaded
9782 from a .mod file. */
9783 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
9785 if (stree->n.tb->pass_arg)
9787 gfc_formal_arglist* i;
9789 /* If an explicit passing argument name is given, walk the arg-list
9793 stree->n.tb->pass_arg_num = 1;
9794 for (i = proc->formal; i; i = i->next)
9796 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
9801 ++stree->n.tb->pass_arg_num;
9806 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
9808 proc->name, stree->n.tb->pass_arg, &where,
9809 stree->n.tb->pass_arg);
9815 /* Otherwise, take the first one; there should in fact be at least
9817 stree->n.tb->pass_arg_num = 1;
9820 gfc_error ("Procedure '%s' with PASS at %L must have at"
9821 " least one argument", proc->name, &where);
9824 me_arg = proc->formal->sym;
9827 /* Now check that the argument-type matches. */
9828 gcc_assert (me_arg);
9829 if (me_arg->ts.type != BT_CLASS)
9831 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
9832 " at %L", proc->name, &where);
9836 if (me_arg->ts.u.derived->components->ts.u.derived
9837 != resolve_bindings_derived)
9839 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
9840 " the derived-type '%s'", me_arg->name, proc->name,
9841 me_arg->name, &where, resolve_bindings_derived->name);
9847 /* If we are extending some type, check that we don't override a procedure
9848 flagged NON_OVERRIDABLE. */
9849 stree->n.tb->overridden = NULL;
9852 gfc_symtree* overridden;
9853 overridden = gfc_find_typebound_proc (super_type, NULL,
9854 stree->name, true, NULL);
9856 if (overridden && overridden->n.tb)
9857 stree->n.tb->overridden = overridden->n.tb;
9859 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
9863 /* See if there's a name collision with a component directly in this type. */
9864 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
9865 if (!strcmp (comp->name, stree->name))
9867 gfc_error ("Procedure '%s' at %L has the same name as a component of"
9869 stree->name, &where, resolve_bindings_derived->name);
9873 /* Try to find a name collision with an inherited component. */
9874 if (super_type && gfc_find_component (super_type, stree->name, true, true))
9876 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
9877 " component of '%s'",
9878 stree->name, &where, resolve_bindings_derived->name);
9882 stree->n.tb->error = 0;
9886 resolve_bindings_result = FAILURE;
9887 stree->n.tb->error = 1;
9891 resolve_typebound_procedures (gfc_symbol* derived)
9895 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
9898 resolve_bindings_derived = derived;
9899 resolve_bindings_result = SUCCESS;
9901 if (derived->f2k_derived->tb_sym_root)
9902 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
9903 &resolve_typebound_procedure);
9905 if (derived->f2k_derived->tb_uop_root)
9906 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
9907 &resolve_typebound_user_op);
9909 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
9911 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
9912 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
9914 resolve_bindings_result = FAILURE;
9917 return resolve_bindings_result;
9921 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
9922 to give all identical derived types the same backend_decl. */
9924 add_dt_to_dt_list (gfc_symbol *derived)
9926 gfc_dt_list *dt_list;
9928 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
9929 if (derived == dt_list->derived)
9932 if (dt_list == NULL)
9934 dt_list = gfc_get_dt_list ();
9935 dt_list->next = gfc_derived_types;
9936 dt_list->derived = derived;
9937 gfc_derived_types = dt_list;
9942 /* Ensure that a derived-type is really not abstract, meaning that every
9943 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
9946 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
9951 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
9953 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
9956 if (st->n.tb && st->n.tb->deferred)
9958 gfc_symtree* overriding;
9959 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
9960 gcc_assert (overriding && overriding->n.tb);
9961 if (overriding->n.tb->deferred)
9963 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
9964 " '%s' is DEFERRED and not overridden",
9965 sub->name, &sub->declared_at, st->name);
9974 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
9976 /* The algorithm used here is to recursively travel up the ancestry of sub
9977 and for each ancestor-type, check all bindings. If any of them is
9978 DEFERRED, look it up starting from sub and see if the found (overriding)
9979 binding is not DEFERRED.
9980 This is not the most efficient way to do this, but it should be ok and is
9981 clearer than something sophisticated. */
9983 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
9985 /* Walk bindings of this ancestor. */
9986 if (ancestor->f2k_derived)
9989 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
9994 /* Find next ancestor type and recurse on it. */
9995 ancestor = gfc_get_derived_super_type (ancestor);
9997 return ensure_not_abstract (sub, ancestor);
10003 static void resolve_symbol (gfc_symbol *sym);
10006 /* Resolve the components of a derived type. */
10009 resolve_fl_derived (gfc_symbol *sym)
10011 gfc_symbol* super_type;
10015 super_type = gfc_get_derived_super_type (sym);
10017 /* Ensure the extended type gets resolved before we do. */
10018 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10021 /* An ABSTRACT type must be extensible. */
10022 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10024 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10025 sym->name, &sym->declared_at);
10029 for (c = sym->components; c != NULL; c = c->next)
10031 if (c->attr.proc_pointer && c->ts.interface)
10033 if (c->ts.interface->attr.procedure)
10034 gfc_error ("Interface '%s', used by procedure pointer component "
10035 "'%s' at %L, is declared in a later PROCEDURE statement",
10036 c->ts.interface->name, c->name, &c->loc);
10038 /* Get the attributes from the interface (now resolved). */
10039 if (c->ts.interface->attr.if_source
10040 || c->ts.interface->attr.intrinsic)
10042 gfc_symbol *ifc = c->ts.interface;
10044 if (ifc->formal && !ifc->formal_ns)
10045 resolve_symbol (ifc);
10047 if (ifc->attr.intrinsic)
10048 resolve_intrinsic (ifc, &ifc->declared_at);
10052 c->ts = ifc->result->ts;
10053 c->attr.allocatable = ifc->result->attr.allocatable;
10054 c->attr.pointer = ifc->result->attr.pointer;
10055 c->attr.dimension = ifc->result->attr.dimension;
10056 c->as = gfc_copy_array_spec (ifc->result->as);
10061 c->attr.allocatable = ifc->attr.allocatable;
10062 c->attr.pointer = ifc->attr.pointer;
10063 c->attr.dimension = ifc->attr.dimension;
10064 c->as = gfc_copy_array_spec (ifc->as);
10066 c->ts.interface = ifc;
10067 c->attr.function = ifc->attr.function;
10068 c->attr.subroutine = ifc->attr.subroutine;
10069 gfc_copy_formal_args_ppc (c, ifc);
10071 c->attr.pure = ifc->attr.pure;
10072 c->attr.elemental = ifc->attr.elemental;
10073 c->attr.recursive = ifc->attr.recursive;
10074 c->attr.always_explicit = ifc->attr.always_explicit;
10075 c->attr.ext_attr |= ifc->attr.ext_attr;
10076 /* Replace symbols in array spec. */
10080 for (i = 0; i < c->as->rank; i++)
10082 gfc_expr_replace_comp (c->as->lower[i], c);
10083 gfc_expr_replace_comp (c->as->upper[i], c);
10086 /* Copy char length. */
10087 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10089 c->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10090 gfc_expr_replace_comp (c->ts.u.cl->length, c);
10093 else if (c->ts.interface->name[0] != '\0')
10095 gfc_error ("Interface '%s' of procedure pointer component "
10096 "'%s' at %L must be explicit", c->ts.interface->name,
10101 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10103 c->ts = *gfc_get_default_type (c->name, NULL);
10104 c->attr.implicit_type = 1;
10107 /* Procedure pointer components: Check PASS arg. */
10108 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0)
10110 gfc_symbol* me_arg;
10112 if (c->tb->pass_arg)
10114 gfc_formal_arglist* i;
10116 /* If an explicit passing argument name is given, walk the arg-list
10117 and look for it. */
10120 c->tb->pass_arg_num = 1;
10121 for (i = c->formal; i; i = i->next)
10123 if (!strcmp (i->sym->name, c->tb->pass_arg))
10128 c->tb->pass_arg_num++;
10133 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10134 "at %L has no argument '%s'", c->name,
10135 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10142 /* Otherwise, take the first one; there should in fact be at least
10144 c->tb->pass_arg_num = 1;
10147 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10148 "must have at least one argument",
10153 me_arg = c->formal->sym;
10156 /* Now check that the argument-type matches. */
10157 gcc_assert (me_arg);
10158 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10159 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10160 || (me_arg->ts.type == BT_CLASS
10161 && me_arg->ts.u.derived->components->ts.u.derived != sym))
10163 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10164 " the derived type '%s'", me_arg->name, c->name,
10165 me_arg->name, &c->loc, sym->name);
10170 /* Check for C453. */
10171 if (me_arg->attr.dimension)
10173 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10174 "must be scalar", me_arg->name, c->name, me_arg->name,
10180 if (me_arg->attr.pointer)
10182 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10183 "may not have the POINTER attribute", me_arg->name,
10184 c->name, me_arg->name, &c->loc);
10189 if (me_arg->attr.allocatable)
10191 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10192 "may not be ALLOCATABLE", me_arg->name, c->name,
10193 me_arg->name, &c->loc);
10198 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
10199 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10200 " at %L", c->name, &c->loc);
10204 /* Check type-spec if this is not the parent-type component. */
10205 if ((!sym->attr.extension || c != sym->components)
10206 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
10209 /* If this type is an extension, see if this component has the same name
10210 as an inherited type-bound procedure. */
10212 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
10214 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
10215 " inherited type-bound procedure",
10216 c->name, sym->name, &c->loc);
10220 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
10222 if (c->ts.u.cl->length == NULL
10223 || (resolve_charlen (c->ts.u.cl) == FAILURE)
10224 || !gfc_is_constant_expr (c->ts.u.cl->length))
10226 gfc_error ("Character length of component '%s' needs to "
10227 "be a constant specification expression at %L",
10229 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
10234 if (c->ts.type == BT_DERIVED
10235 && sym->component_access != ACCESS_PRIVATE
10236 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10237 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
10238 && !c->ts.u.derived->attr.use_assoc
10239 && !gfc_check_access (c->ts.u.derived->attr.access,
10240 c->ts.u.derived->ns->default_access)
10241 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
10242 "is a PRIVATE type and cannot be a component of "
10243 "'%s', which is PUBLIC at %L", c->name,
10244 sym->name, &sym->declared_at) == FAILURE)
10247 if (sym->attr.sequence)
10249 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
10251 gfc_error ("Component %s of SEQUENCE type declared at %L does "
10252 "not have the SEQUENCE attribute",
10253 c->ts.u.derived->name, &sym->declared_at);
10258 if (c->ts.type == BT_DERIVED && c->attr.pointer
10259 && c->ts.u.derived->components == NULL
10260 && !c->ts.u.derived->attr.zero_comp)
10262 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10263 "that has not been declared", c->name, sym->name,
10269 if (c->ts.type == BT_CLASS
10270 && !(c->ts.u.derived->components->attr.pointer
10271 || c->ts.u.derived->components->attr.allocatable))
10273 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
10274 "or pointer", c->name, &c->loc);
10278 /* Ensure that all the derived type components are put on the
10279 derived type list; even in formal namespaces, where derived type
10280 pointer components might not have been declared. */
10281 if (c->ts.type == BT_DERIVED
10283 && c->ts.u.derived->components
10285 && sym != c->ts.u.derived)
10286 add_dt_to_dt_list (c->ts.u.derived);
10288 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
10292 for (i = 0; i < c->as->rank; i++)
10294 if (c->as->lower[i] == NULL
10295 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
10296 || !gfc_is_constant_expr (c->as->lower[i])
10297 || c->as->upper[i] == NULL
10298 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
10299 || !gfc_is_constant_expr (c->as->upper[i]))
10301 gfc_error ("Component '%s' of '%s' at %L must have "
10302 "constant array bounds",
10303 c->name, sym->name, &c->loc);
10309 /* Resolve the type-bound procedures. */
10310 if (resolve_typebound_procedures (sym) == FAILURE)
10313 /* Resolve the finalizer procedures. */
10314 if (gfc_resolve_finalizers (sym) == FAILURE)
10317 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
10318 all DEFERRED bindings are overridden. */
10319 if (super_type && super_type->attr.abstract && !sym->attr.abstract
10320 && ensure_not_abstract (sym, super_type) == FAILURE)
10323 /* Add derived type to the derived type list. */
10324 add_dt_to_dt_list (sym);
10331 resolve_fl_namelist (gfc_symbol *sym)
10336 /* Reject PRIVATE objects in a PUBLIC namelist. */
10337 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
10339 for (nl = sym->namelist; nl; nl = nl->next)
10341 if (!nl->sym->attr.use_assoc
10342 && !is_sym_host_assoc (nl->sym, sym->ns)
10343 && !gfc_check_access(nl->sym->attr.access,
10344 nl->sym->ns->default_access))
10346 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
10347 "cannot be member of PUBLIC namelist '%s' at %L",
10348 nl->sym->name, sym->name, &sym->declared_at);
10352 /* Types with private components that came here by USE-association. */
10353 if (nl->sym->ts.type == BT_DERIVED
10354 && derived_inaccessible (nl->sym->ts.u.derived))
10356 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
10357 "components and cannot be member of namelist '%s' at %L",
10358 nl->sym->name, sym->name, &sym->declared_at);
10362 /* Types with private components that are defined in the same module. */
10363 if (nl->sym->ts.type == BT_DERIVED
10364 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
10365 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
10366 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
10367 nl->sym->ns->default_access))
10369 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
10370 "cannot be a member of PUBLIC namelist '%s' at %L",
10371 nl->sym->name, sym->name, &sym->declared_at);
10377 for (nl = sym->namelist; nl; nl = nl->next)
10379 /* Reject namelist arrays of assumed shape. */
10380 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
10381 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
10382 "must not have assumed shape in namelist "
10383 "'%s' at %L", nl->sym->name, sym->name,
10384 &sym->declared_at) == FAILURE)
10387 /* Reject namelist arrays that are not constant shape. */
10388 if (is_non_constant_shape_array (nl->sym))
10390 gfc_error ("NAMELIST array object '%s' must have constant "
10391 "shape in namelist '%s' at %L", nl->sym->name,
10392 sym->name, &sym->declared_at);
10396 /* Namelist objects cannot have allocatable or pointer components. */
10397 if (nl->sym->ts.type != BT_DERIVED)
10400 if (nl->sym->ts.u.derived->attr.alloc_comp)
10402 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10403 "have ALLOCATABLE components",
10404 nl->sym->name, sym->name, &sym->declared_at);
10408 if (nl->sym->ts.u.derived->attr.pointer_comp)
10410 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10411 "have POINTER components",
10412 nl->sym->name, sym->name, &sym->declared_at);
10418 /* 14.1.2 A module or internal procedure represent local entities
10419 of the same type as a namelist member and so are not allowed. */
10420 for (nl = sym->namelist; nl; nl = nl->next)
10422 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
10425 if (nl->sym->attr.function && nl->sym == nl->sym->result)
10426 if ((nl->sym == sym->ns->proc_name)
10428 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
10432 if (nl->sym && nl->sym->name)
10433 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
10434 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
10436 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
10437 "attribute in '%s' at %L", nlsym->name,
10438 &sym->declared_at);
10448 resolve_fl_parameter (gfc_symbol *sym)
10450 /* A parameter array's shape needs to be constant. */
10451 if (sym->as != NULL
10452 && (sym->as->type == AS_DEFERRED
10453 || is_non_constant_shape_array (sym)))
10455 gfc_error ("Parameter array '%s' at %L cannot be automatic "
10456 "or of deferred shape", sym->name, &sym->declared_at);
10460 /* Make sure a parameter that has been implicitly typed still
10461 matches the implicit type, since PARAMETER statements can precede
10462 IMPLICIT statements. */
10463 if (sym->attr.implicit_type
10464 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
10467 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
10468 "later IMPLICIT type", sym->name, &sym->declared_at);
10472 /* Make sure the types of derived parameters are consistent. This
10473 type checking is deferred until resolution because the type may
10474 refer to a derived type from the host. */
10475 if (sym->ts.type == BT_DERIVED
10476 && !gfc_compare_types (&sym->ts, &sym->value->ts))
10478 gfc_error ("Incompatible derived type in PARAMETER at %L",
10479 &sym->value->where);
10486 /* Do anything necessary to resolve a symbol. Right now, we just
10487 assume that an otherwise unknown symbol is a variable. This sort
10488 of thing commonly happens for symbols in module. */
10491 resolve_symbol (gfc_symbol *sym)
10493 int check_constant, mp_flag;
10494 gfc_symtree *symtree;
10495 gfc_symtree *this_symtree;
10499 if (sym->attr.flavor == FL_UNKNOWN)
10502 /* If we find that a flavorless symbol is an interface in one of the
10503 parent namespaces, find its symtree in this namespace, free the
10504 symbol and set the symtree to point to the interface symbol. */
10505 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
10507 symtree = gfc_find_symtree (ns->sym_root, sym->name);
10508 if (symtree && symtree->n.sym->generic)
10510 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
10514 gfc_free_symbol (sym);
10515 symtree->n.sym->refs++;
10516 this_symtree->n.sym = symtree->n.sym;
10521 /* Otherwise give it a flavor according to such attributes as
10523 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
10524 sym->attr.flavor = FL_VARIABLE;
10527 sym->attr.flavor = FL_PROCEDURE;
10528 if (sym->attr.dimension)
10529 sym->attr.function = 1;
10533 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
10534 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
10536 if (sym->attr.procedure && sym->ts.interface
10537 && sym->attr.if_source != IFSRC_DECL)
10539 if (sym->ts.interface == sym)
10541 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
10542 "interface", sym->name, &sym->declared_at);
10545 if (sym->ts.interface->attr.procedure)
10547 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
10548 " in a later PROCEDURE statement", sym->ts.interface->name,
10549 sym->name,&sym->declared_at);
10553 /* Get the attributes from the interface (now resolved). */
10554 if (sym->ts.interface->attr.if_source
10555 || sym->ts.interface->attr.intrinsic)
10557 gfc_symbol *ifc = sym->ts.interface;
10558 resolve_symbol (ifc);
10560 if (ifc->attr.intrinsic)
10561 resolve_intrinsic (ifc, &ifc->declared_at);
10564 sym->ts = ifc->result->ts;
10567 sym->ts.interface = ifc;
10568 sym->attr.function = ifc->attr.function;
10569 sym->attr.subroutine = ifc->attr.subroutine;
10570 gfc_copy_formal_args (sym, ifc);
10572 sym->attr.allocatable = ifc->attr.allocatable;
10573 sym->attr.pointer = ifc->attr.pointer;
10574 sym->attr.pure = ifc->attr.pure;
10575 sym->attr.elemental = ifc->attr.elemental;
10576 sym->attr.dimension = ifc->attr.dimension;
10577 sym->attr.recursive = ifc->attr.recursive;
10578 sym->attr.always_explicit = ifc->attr.always_explicit;
10579 sym->attr.ext_attr |= ifc->attr.ext_attr;
10580 /* Copy array spec. */
10581 sym->as = gfc_copy_array_spec (ifc->as);
10585 for (i = 0; i < sym->as->rank; i++)
10587 gfc_expr_replace_symbols (sym->as->lower[i], sym);
10588 gfc_expr_replace_symbols (sym->as->upper[i], sym);
10591 /* Copy char length. */
10592 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10594 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10595 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
10598 else if (sym->ts.interface->name[0] != '\0')
10600 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
10601 sym->ts.interface->name, sym->name, &sym->declared_at);
10606 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
10609 /* Symbols that are module procedures with results (functions) have
10610 the types and array specification copied for type checking in
10611 procedures that call them, as well as for saving to a module
10612 file. These symbols can't stand the scrutiny that their results
10614 mp_flag = (sym->result != NULL && sym->result != sym);
10617 /* Make sure that the intrinsic is consistent with its internal
10618 representation. This needs to be done before assigning a default
10619 type to avoid spurious warnings. */
10620 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
10621 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
10624 /* Assign default type to symbols that need one and don't have one. */
10625 if (sym->ts.type == BT_UNKNOWN)
10627 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
10628 gfc_set_default_type (sym, 1, NULL);
10630 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
10631 && !sym->attr.function && !sym->attr.subroutine
10632 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
10633 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
10635 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
10637 /* The specific case of an external procedure should emit an error
10638 in the case that there is no implicit type. */
10640 gfc_set_default_type (sym, sym->attr.external, NULL);
10643 /* Result may be in another namespace. */
10644 resolve_symbol (sym->result);
10646 if (!sym->result->attr.proc_pointer)
10648 sym->ts = sym->result->ts;
10649 sym->as = gfc_copy_array_spec (sym->result->as);
10650 sym->attr.dimension = sym->result->attr.dimension;
10651 sym->attr.pointer = sym->result->attr.pointer;
10652 sym->attr.allocatable = sym->result->attr.allocatable;
10658 /* Assumed size arrays and assumed shape arrays must be dummy
10661 if (sym->as != NULL
10662 && (sym->as->type == AS_ASSUMED_SIZE
10663 || sym->as->type == AS_ASSUMED_SHAPE)
10664 && sym->attr.dummy == 0)
10666 if (sym->as->type == AS_ASSUMED_SIZE)
10667 gfc_error ("Assumed size array at %L must be a dummy argument",
10668 &sym->declared_at);
10670 gfc_error ("Assumed shape array at %L must be a dummy argument",
10671 &sym->declared_at);
10675 /* Make sure symbols with known intent or optional are really dummy
10676 variable. Because of ENTRY statement, this has to be deferred
10677 until resolution time. */
10679 if (!sym->attr.dummy
10680 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
10682 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
10686 if (sym->attr.value && !sym->attr.dummy)
10688 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
10689 "it is not a dummy argument", sym->name, &sym->declared_at);
10693 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
10695 gfc_charlen *cl = sym->ts.u.cl;
10696 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10698 gfc_error ("Character dummy variable '%s' at %L with VALUE "
10699 "attribute must have constant length",
10700 sym->name, &sym->declared_at);
10704 if (sym->ts.is_c_interop
10705 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
10707 gfc_error ("C interoperable character dummy variable '%s' at %L "
10708 "with VALUE attribute must have length one",
10709 sym->name, &sym->declared_at);
10714 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
10715 do this for something that was implicitly typed because that is handled
10716 in gfc_set_default_type. Handle dummy arguments and procedure
10717 definitions separately. Also, anything that is use associated is not
10718 handled here but instead is handled in the module it is declared in.
10719 Finally, derived type definitions are allowed to be BIND(C) since that
10720 only implies that they're interoperable, and they are checked fully for
10721 interoperability when a variable is declared of that type. */
10722 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
10723 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
10724 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
10726 gfc_try t = SUCCESS;
10728 /* First, make sure the variable is declared at the
10729 module-level scope (J3/04-007, Section 15.3). */
10730 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
10731 sym->attr.in_common == 0)
10733 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
10734 "is neither a COMMON block nor declared at the "
10735 "module level scope", sym->name, &(sym->declared_at));
10738 else if (sym->common_head != NULL)
10740 t = verify_com_block_vars_c_interop (sym->common_head);
10744 /* If type() declaration, we need to verify that the components
10745 of the given type are all C interoperable, etc. */
10746 if (sym->ts.type == BT_DERIVED &&
10747 sym->ts.u.derived->attr.is_c_interop != 1)
10749 /* Make sure the user marked the derived type as BIND(C). If
10750 not, call the verify routine. This could print an error
10751 for the derived type more than once if multiple variables
10752 of that type are declared. */
10753 if (sym->ts.u.derived->attr.is_bind_c != 1)
10754 verify_bind_c_derived_type (sym->ts.u.derived);
10758 /* Verify the variable itself as C interoperable if it
10759 is BIND(C). It is not possible for this to succeed if
10760 the verify_bind_c_derived_type failed, so don't have to handle
10761 any error returned by verify_bind_c_derived_type. */
10762 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
10763 sym->common_block);
10768 /* clear the is_bind_c flag to prevent reporting errors more than
10769 once if something failed. */
10770 sym->attr.is_bind_c = 0;
10775 /* If a derived type symbol has reached this point, without its
10776 type being declared, we have an error. Notice that most
10777 conditions that produce undefined derived types have already
10778 been dealt with. However, the likes of:
10779 implicit type(t) (t) ..... call foo (t) will get us here if
10780 the type is not declared in the scope of the implicit
10781 statement. Change the type to BT_UNKNOWN, both because it is so
10782 and to prevent an ICE. */
10783 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
10784 && !sym->ts.u.derived->attr.zero_comp)
10786 gfc_error ("The derived type '%s' at %L is of type '%s', "
10787 "which has not been defined", sym->name,
10788 &sym->declared_at, sym->ts.u.derived->name);
10789 sym->ts.type = BT_UNKNOWN;
10793 /* Make sure that the derived type has been resolved and that the
10794 derived type is visible in the symbol's namespace, if it is a
10795 module function and is not PRIVATE. */
10796 if (sym->ts.type == BT_DERIVED
10797 && sym->ts.u.derived->attr.use_assoc
10798 && sym->ns->proc_name
10799 && sym->ns->proc_name->attr.flavor == FL_MODULE)
10803 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
10806 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
10807 if (!ds && sym->attr.function
10808 && gfc_check_access (sym->attr.access, sym->ns->default_access))
10810 symtree = gfc_new_symtree (&sym->ns->sym_root,
10811 sym->ts.u.derived->name);
10812 symtree->n.sym = sym->ts.u.derived;
10813 sym->ts.u.derived->refs++;
10817 /* Unless the derived-type declaration is use associated, Fortran 95
10818 does not allow public entries of private derived types.
10819 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
10820 161 in 95-006r3. */
10821 if (sym->ts.type == BT_DERIVED
10822 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
10823 && !sym->ts.u.derived->attr.use_assoc
10824 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10825 && !gfc_check_access (sym->ts.u.derived->attr.access,
10826 sym->ts.u.derived->ns->default_access)
10827 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
10828 "of PRIVATE derived type '%s'",
10829 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
10830 : "variable", sym->name, &sym->declared_at,
10831 sym->ts.u.derived->name) == FAILURE)
10834 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
10835 default initialization is defined (5.1.2.4.4). */
10836 if (sym->ts.type == BT_DERIVED
10838 && sym->attr.intent == INTENT_OUT
10840 && sym->as->type == AS_ASSUMED_SIZE)
10842 for (c = sym->ts.u.derived->components; c; c = c->next)
10844 if (c->initializer)
10846 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
10847 "ASSUMED SIZE and so cannot have a default initializer",
10848 sym->name, &sym->declared_at);
10854 switch (sym->attr.flavor)
10857 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
10862 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
10867 if (resolve_fl_namelist (sym) == FAILURE)
10872 if (resolve_fl_parameter (sym) == FAILURE)
10880 /* Resolve array specifier. Check as well some constraints
10881 on COMMON blocks. */
10883 check_constant = sym->attr.in_common && !sym->attr.pointer;
10885 /* Set the formal_arg_flag so that check_conflict will not throw
10886 an error for host associated variables in the specification
10887 expression for an array_valued function. */
10888 if (sym->attr.function && sym->as)
10889 formal_arg_flag = 1;
10891 gfc_resolve_array_spec (sym->as, check_constant);
10893 formal_arg_flag = 0;
10895 /* Resolve formal namespaces. */
10896 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
10897 && !sym->attr.contained && !sym->attr.intrinsic)
10898 gfc_resolve (sym->formal_ns);
10900 /* Make sure the formal namespace is present. */
10901 if (sym->formal && !sym->formal_ns)
10903 gfc_formal_arglist *formal = sym->formal;
10904 while (formal && !formal->sym)
10905 formal = formal->next;
10909 sym->formal_ns = formal->sym->ns;
10910 sym->formal_ns->refs++;
10914 /* Check threadprivate restrictions. */
10915 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
10916 && (!sym->attr.in_common
10917 && sym->module == NULL
10918 && (sym->ns->proc_name == NULL
10919 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
10920 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
10922 /* If we have come this far we can apply default-initializers, as
10923 described in 14.7.5, to those variables that have not already
10924 been assigned one. */
10925 if (sym->ts.type == BT_DERIVED
10926 && sym->attr.referenced
10927 && sym->ns == gfc_current_ns
10929 && !sym->attr.allocatable
10930 && !sym->attr.alloc_comp)
10932 symbol_attribute *a = &sym->attr;
10934 if ((!a->save && !a->dummy && !a->pointer
10935 && !a->in_common && !a->use_assoc
10936 && !(a->function && sym != sym->result))
10937 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
10938 apply_default_init (sym);
10941 /* If this symbol has a type-spec, check it. */
10942 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
10943 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
10944 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
10950 /************* Resolve DATA statements *************/
10954 gfc_data_value *vnode;
10960 /* Advance the values structure to point to the next value in the data list. */
10963 next_data_value (void)
10965 while (mpz_cmp_ui (values.left, 0) == 0)
10967 if (!gfc_is_constant_expr (values.vnode->expr))
10968 gfc_error ("non-constant DATA value at %L",
10969 &values.vnode->expr->where);
10971 if (values.vnode->next == NULL)
10974 values.vnode = values.vnode->next;
10975 mpz_set (values.left, values.vnode->repeat);
10983 check_data_variable (gfc_data_variable *var, locus *where)
10989 ar_type mark = AR_UNKNOWN;
10991 mpz_t section_index[GFC_MAX_DIMENSIONS];
10997 if (gfc_resolve_expr (var->expr) == FAILURE)
11001 mpz_init_set_si (offset, 0);
11004 if (e->expr_type != EXPR_VARIABLE)
11005 gfc_internal_error ("check_data_variable(): Bad expression");
11007 sym = e->symtree->n.sym;
11009 if (sym->ns->is_block_data && !sym->attr.in_common)
11011 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11012 sym->name, &sym->declared_at);
11015 if (e->ref == NULL && sym->as)
11017 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11018 " declaration", sym->name, where);
11022 has_pointer = sym->attr.pointer;
11024 for (ref = e->ref; ref; ref = ref->next)
11026 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11030 && ref->type == REF_ARRAY
11031 && ref->u.ar.type != AR_FULL)
11033 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11034 "be a full array", sym->name, where);
11039 if (e->rank == 0 || has_pointer)
11041 mpz_init_set_ui (size, 1);
11048 /* Find the array section reference. */
11049 for (ref = e->ref; ref; ref = ref->next)
11051 if (ref->type != REF_ARRAY)
11053 if (ref->u.ar.type == AR_ELEMENT)
11059 /* Set marks according to the reference pattern. */
11060 switch (ref->u.ar.type)
11068 /* Get the start position of array section. */
11069 gfc_get_section_index (ar, section_index, &offset);
11074 gcc_unreachable ();
11077 if (gfc_array_size (e, &size) == FAILURE)
11079 gfc_error ("Nonconstant array section at %L in DATA statement",
11081 mpz_clear (offset);
11088 while (mpz_cmp_ui (size, 0) > 0)
11090 if (next_data_value () == FAILURE)
11092 gfc_error ("DATA statement at %L has more variables than values",
11098 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
11102 /* If we have more than one element left in the repeat count,
11103 and we have more than one element left in the target variable,
11104 then create a range assignment. */
11105 /* FIXME: Only done for full arrays for now, since array sections
11107 if (mark == AR_FULL && ref && ref->next == NULL
11108 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
11112 if (mpz_cmp (size, values.left) >= 0)
11114 mpz_init_set (range, values.left);
11115 mpz_sub (size, size, values.left);
11116 mpz_set_ui (values.left, 0);
11120 mpz_init_set (range, size);
11121 mpz_sub (values.left, values.left, size);
11122 mpz_set_ui (size, 0);
11125 gfc_assign_data_value_range (var->expr, values.vnode->expr,
11128 mpz_add (offset, offset, range);
11132 /* Assign initial value to symbol. */
11135 mpz_sub_ui (values.left, values.left, 1);
11136 mpz_sub_ui (size, size, 1);
11138 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
11142 if (mark == AR_FULL)
11143 mpz_add_ui (offset, offset, 1);
11145 /* Modify the array section indexes and recalculate the offset
11146 for next element. */
11147 else if (mark == AR_SECTION)
11148 gfc_advance_section (section_index, ar, &offset);
11152 if (mark == AR_SECTION)
11154 for (i = 0; i < ar->dimen; i++)
11155 mpz_clear (section_index[i]);
11159 mpz_clear (offset);
11165 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
11167 /* Iterate over a list of elements in a DATA statement. */
11170 traverse_data_list (gfc_data_variable *var, locus *where)
11173 iterator_stack frame;
11174 gfc_expr *e, *start, *end, *step;
11175 gfc_try retval = SUCCESS;
11177 mpz_init (frame.value);
11179 start = gfc_copy_expr (var->iter.start);
11180 end = gfc_copy_expr (var->iter.end);
11181 step = gfc_copy_expr (var->iter.step);
11183 if (gfc_simplify_expr (start, 1) == FAILURE
11184 || start->expr_type != EXPR_CONSTANT)
11186 gfc_error ("iterator start at %L does not simplify", &start->where);
11190 if (gfc_simplify_expr (end, 1) == FAILURE
11191 || end->expr_type != EXPR_CONSTANT)
11193 gfc_error ("iterator end at %L does not simplify", &end->where);
11197 if (gfc_simplify_expr (step, 1) == FAILURE
11198 || step->expr_type != EXPR_CONSTANT)
11200 gfc_error ("iterator step at %L does not simplify", &step->where);
11205 mpz_init_set (trip, end->value.integer);
11206 mpz_sub (trip, trip, start->value.integer);
11207 mpz_add (trip, trip, step->value.integer);
11209 mpz_div (trip, trip, step->value.integer);
11211 mpz_set (frame.value, start->value.integer);
11213 frame.prev = iter_stack;
11214 frame.variable = var->iter.var->symtree;
11215 iter_stack = &frame;
11217 while (mpz_cmp_ui (trip, 0) > 0)
11219 if (traverse_data_var (var->list, where) == FAILURE)
11226 e = gfc_copy_expr (var->expr);
11227 if (gfc_simplify_expr (e, 1) == FAILURE)
11235 mpz_add (frame.value, frame.value, step->value.integer);
11237 mpz_sub_ui (trip, trip, 1);
11242 mpz_clear (frame.value);
11244 gfc_free_expr (start);
11245 gfc_free_expr (end);
11246 gfc_free_expr (step);
11248 iter_stack = frame.prev;
11253 /* Type resolve variables in the variable list of a DATA statement. */
11256 traverse_data_var (gfc_data_variable *var, locus *where)
11260 for (; var; var = var->next)
11262 if (var->expr == NULL)
11263 t = traverse_data_list (var, where);
11265 t = check_data_variable (var, where);
11275 /* Resolve the expressions and iterators associated with a data statement.
11276 This is separate from the assignment checking because data lists should
11277 only be resolved once. */
11280 resolve_data_variables (gfc_data_variable *d)
11282 for (; d; d = d->next)
11284 if (d->list == NULL)
11286 if (gfc_resolve_expr (d->expr) == FAILURE)
11291 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
11294 if (resolve_data_variables (d->list) == FAILURE)
11303 /* Resolve a single DATA statement. We implement this by storing a pointer to
11304 the value list into static variables, and then recursively traversing the
11305 variables list, expanding iterators and such. */
11308 resolve_data (gfc_data *d)
11311 if (resolve_data_variables (d->var) == FAILURE)
11314 values.vnode = d->value;
11315 if (d->value == NULL)
11316 mpz_set_ui (values.left, 0);
11318 mpz_set (values.left, d->value->repeat);
11320 if (traverse_data_var (d->var, &d->where) == FAILURE)
11323 /* At this point, we better not have any values left. */
11325 if (next_data_value () == SUCCESS)
11326 gfc_error ("DATA statement at %L has more values than variables",
11331 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
11332 accessed by host or use association, is a dummy argument to a pure function,
11333 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
11334 is storage associated with any such variable, shall not be used in the
11335 following contexts: (clients of this function). */
11337 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
11338 procedure. Returns zero if assignment is OK, nonzero if there is a
11341 gfc_impure_variable (gfc_symbol *sym)
11345 if (sym->attr.use_assoc || sym->attr.in_common)
11348 if (sym->ns != gfc_current_ns)
11349 return !sym->attr.function;
11351 proc = sym->ns->proc_name;
11352 if (sym->attr.dummy && gfc_pure (proc)
11353 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
11355 proc->attr.function))
11358 /* TODO: Sort out what can be storage associated, if anything, and include
11359 it here. In principle equivalences should be scanned but it does not
11360 seem to be possible to storage associate an impure variable this way. */
11365 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
11366 symbol of the current procedure. */
11369 gfc_pure (gfc_symbol *sym)
11371 symbol_attribute attr;
11374 sym = gfc_current_ns->proc_name;
11380 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
11384 /* Test whether the current procedure is elemental or not. */
11387 gfc_elemental (gfc_symbol *sym)
11389 symbol_attribute attr;
11392 sym = gfc_current_ns->proc_name;
11397 return attr.flavor == FL_PROCEDURE && attr.elemental;
11401 /* Warn about unused labels. */
11404 warn_unused_fortran_label (gfc_st_label *label)
11409 warn_unused_fortran_label (label->left);
11411 if (label->defined == ST_LABEL_UNKNOWN)
11414 switch (label->referenced)
11416 case ST_LABEL_UNKNOWN:
11417 gfc_warning ("Label %d at %L defined but not used", label->value,
11421 case ST_LABEL_BAD_TARGET:
11422 gfc_warning ("Label %d at %L defined but cannot be used",
11423 label->value, &label->where);
11430 warn_unused_fortran_label (label->right);
11434 /* Returns the sequence type of a symbol or sequence. */
11437 sequence_type (gfc_typespec ts)
11446 if (ts.u.derived->components == NULL)
11447 return SEQ_NONDEFAULT;
11449 result = sequence_type (ts.u.derived->components->ts);
11450 for (c = ts.u.derived->components->next; c; c = c->next)
11451 if (sequence_type (c->ts) != result)
11457 if (ts.kind != gfc_default_character_kind)
11458 return SEQ_NONDEFAULT;
11460 return SEQ_CHARACTER;
11463 if (ts.kind != gfc_default_integer_kind)
11464 return SEQ_NONDEFAULT;
11466 return SEQ_NUMERIC;
11469 if (!(ts.kind == gfc_default_real_kind
11470 || ts.kind == gfc_default_double_kind))
11471 return SEQ_NONDEFAULT;
11473 return SEQ_NUMERIC;
11476 if (ts.kind != gfc_default_complex_kind)
11477 return SEQ_NONDEFAULT;
11479 return SEQ_NUMERIC;
11482 if (ts.kind != gfc_default_logical_kind)
11483 return SEQ_NONDEFAULT;
11485 return SEQ_NUMERIC;
11488 return SEQ_NONDEFAULT;
11493 /* Resolve derived type EQUIVALENCE object. */
11496 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
11498 gfc_component *c = derived->components;
11503 /* Shall not be an object of nonsequence derived type. */
11504 if (!derived->attr.sequence)
11506 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
11507 "attribute to be an EQUIVALENCE object", sym->name,
11512 /* Shall not have allocatable components. */
11513 if (derived->attr.alloc_comp)
11515 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
11516 "components to be an EQUIVALENCE object",sym->name,
11521 if (sym->attr.in_common && has_default_initializer (sym->ts.u.derived))
11523 gfc_error ("Derived type variable '%s' at %L with default "
11524 "initialization cannot be in EQUIVALENCE with a variable "
11525 "in COMMON", sym->name, &e->where);
11529 for (; c ; c = c->next)
11531 if (c->ts.type == BT_DERIVED
11532 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
11535 /* Shall not be an object of sequence derived type containing a pointer
11536 in the structure. */
11537 if (c->attr.pointer)
11539 gfc_error ("Derived type variable '%s' at %L with pointer "
11540 "component(s) cannot be an EQUIVALENCE object",
11541 sym->name, &e->where);
11549 /* Resolve equivalence object.
11550 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
11551 an allocatable array, an object of nonsequence derived type, an object of
11552 sequence derived type containing a pointer at any level of component
11553 selection, an automatic object, a function name, an entry name, a result
11554 name, a named constant, a structure component, or a subobject of any of
11555 the preceding objects. A substring shall not have length zero. A
11556 derived type shall not have components with default initialization nor
11557 shall two objects of an equivalence group be initialized.
11558 Either all or none of the objects shall have an protected attribute.
11559 The simple constraints are done in symbol.c(check_conflict) and the rest
11560 are implemented here. */
11563 resolve_equivalence (gfc_equiv *eq)
11566 gfc_symbol *first_sym;
11569 locus *last_where = NULL;
11570 seq_type eq_type, last_eq_type;
11571 gfc_typespec *last_ts;
11572 int object, cnt_protected;
11573 const char *value_name;
11577 last_ts = &eq->expr->symtree->n.sym->ts;
11579 first_sym = eq->expr->symtree->n.sym;
11583 for (object = 1; eq; eq = eq->eq, object++)
11587 e->ts = e->symtree->n.sym->ts;
11588 /* match_varspec might not know yet if it is seeing
11589 array reference or substring reference, as it doesn't
11591 if (e->ref && e->ref->type == REF_ARRAY)
11593 gfc_ref *ref = e->ref;
11594 sym = e->symtree->n.sym;
11596 if (sym->attr.dimension)
11598 ref->u.ar.as = sym->as;
11602 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
11603 if (e->ts.type == BT_CHARACTER
11605 && ref->type == REF_ARRAY
11606 && ref->u.ar.dimen == 1
11607 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
11608 && ref->u.ar.stride[0] == NULL)
11610 gfc_expr *start = ref->u.ar.start[0];
11611 gfc_expr *end = ref->u.ar.end[0];
11614 /* Optimize away the (:) reference. */
11615 if (start == NULL && end == NULL)
11618 e->ref = ref->next;
11620 e->ref->next = ref->next;
11625 ref->type = REF_SUBSTRING;
11627 start = gfc_int_expr (1);
11628 ref->u.ss.start = start;
11629 if (end == NULL && e->ts.u.cl)
11630 end = gfc_copy_expr (e->ts.u.cl->length);
11631 ref->u.ss.end = end;
11632 ref->u.ss.length = e->ts.u.cl;
11639 /* Any further ref is an error. */
11642 gcc_assert (ref->type == REF_ARRAY);
11643 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
11649 if (gfc_resolve_expr (e) == FAILURE)
11652 sym = e->symtree->n.sym;
11654 if (sym->attr.is_protected)
11656 if (cnt_protected > 0 && cnt_protected != object)
11658 gfc_error ("Either all or none of the objects in the "
11659 "EQUIVALENCE set at %L shall have the "
11660 "PROTECTED attribute",
11665 /* Shall not equivalence common block variables in a PURE procedure. */
11666 if (sym->ns->proc_name
11667 && sym->ns->proc_name->attr.pure
11668 && sym->attr.in_common)
11670 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
11671 "object in the pure procedure '%s'",
11672 sym->name, &e->where, sym->ns->proc_name->name);
11676 /* Shall not be a named constant. */
11677 if (e->expr_type == EXPR_CONSTANT)
11679 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
11680 "object", sym->name, &e->where);
11684 if (e->ts.type == BT_DERIVED
11685 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
11688 /* Check that the types correspond correctly:
11690 A numeric sequence structure may be equivalenced to another sequence
11691 structure, an object of default integer type, default real type, double
11692 precision real type, default logical type such that components of the
11693 structure ultimately only become associated to objects of the same
11694 kind. A character sequence structure may be equivalenced to an object
11695 of default character kind or another character sequence structure.
11696 Other objects may be equivalenced only to objects of the same type and
11697 kind parameters. */
11699 /* Identical types are unconditionally OK. */
11700 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
11701 goto identical_types;
11703 last_eq_type = sequence_type (*last_ts);
11704 eq_type = sequence_type (sym->ts);
11706 /* Since the pair of objects is not of the same type, mixed or
11707 non-default sequences can be rejected. */
11709 msg = "Sequence %s with mixed components in EQUIVALENCE "
11710 "statement at %L with different type objects";
11712 && last_eq_type == SEQ_MIXED
11713 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
11715 || (eq_type == SEQ_MIXED
11716 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11717 &e->where) == FAILURE))
11720 msg = "Non-default type object or sequence %s in EQUIVALENCE "
11721 "statement at %L with objects of different type";
11723 && last_eq_type == SEQ_NONDEFAULT
11724 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
11725 last_where) == FAILURE)
11726 || (eq_type == SEQ_NONDEFAULT
11727 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11728 &e->where) == FAILURE))
11731 msg ="Non-CHARACTER object '%s' in default CHARACTER "
11732 "EQUIVALENCE statement at %L";
11733 if (last_eq_type == SEQ_CHARACTER
11734 && eq_type != SEQ_CHARACTER
11735 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11736 &e->where) == FAILURE)
11739 msg ="Non-NUMERIC object '%s' in default NUMERIC "
11740 "EQUIVALENCE statement at %L";
11741 if (last_eq_type == SEQ_NUMERIC
11742 && eq_type != SEQ_NUMERIC
11743 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11744 &e->where) == FAILURE)
11749 last_where = &e->where;
11754 /* Shall not be an automatic array. */
11755 if (e->ref->type == REF_ARRAY
11756 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
11758 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
11759 "an EQUIVALENCE object", sym->name, &e->where);
11766 /* Shall not be a structure component. */
11767 if (r->type == REF_COMPONENT)
11769 gfc_error ("Structure component '%s' at %L cannot be an "
11770 "EQUIVALENCE object",
11771 r->u.c.component->name, &e->where);
11775 /* A substring shall not have length zero. */
11776 if (r->type == REF_SUBSTRING)
11778 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
11780 gfc_error ("Substring at %L has length zero",
11781 &r->u.ss.start->where);
11791 /* Resolve function and ENTRY types, issue diagnostics if needed. */
11794 resolve_fntype (gfc_namespace *ns)
11796 gfc_entry_list *el;
11799 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
11802 /* If there are any entries, ns->proc_name is the entry master
11803 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
11805 sym = ns->entries->sym;
11807 sym = ns->proc_name;
11808 if (sym->result == sym
11809 && sym->ts.type == BT_UNKNOWN
11810 && gfc_set_default_type (sym, 0, NULL) == FAILURE
11811 && !sym->attr.untyped)
11813 gfc_error ("Function '%s' at %L has no IMPLICIT type",
11814 sym->name, &sym->declared_at);
11815 sym->attr.untyped = 1;
11818 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
11819 && !sym->attr.contained
11820 && !gfc_check_access (sym->ts.u.derived->attr.access,
11821 sym->ts.u.derived->ns->default_access)
11822 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11824 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
11825 "%L of PRIVATE type '%s'", sym->name,
11826 &sym->declared_at, sym->ts.u.derived->name);
11830 for (el = ns->entries->next; el; el = el->next)
11832 if (el->sym->result == el->sym
11833 && el->sym->ts.type == BT_UNKNOWN
11834 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
11835 && !el->sym->attr.untyped)
11837 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
11838 el->sym->name, &el->sym->declared_at);
11839 el->sym->attr.untyped = 1;
11845 /* 12.3.2.1.1 Defined operators. */
11848 check_uop_procedure (gfc_symbol *sym, locus where)
11850 gfc_formal_arglist *formal;
11852 if (!sym->attr.function)
11854 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
11855 sym->name, &where);
11859 if (sym->ts.type == BT_CHARACTER
11860 && !(sym->ts.u.cl && sym->ts.u.cl->length)
11861 && !(sym->result && sym->result->ts.u.cl
11862 && sym->result->ts.u.cl->length))
11864 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
11865 "character length", sym->name, &where);
11869 formal = sym->formal;
11870 if (!formal || !formal->sym)
11872 gfc_error ("User operator procedure '%s' at %L must have at least "
11873 "one argument", sym->name, &where);
11877 if (formal->sym->attr.intent != INTENT_IN)
11879 gfc_error ("First argument of operator interface at %L must be "
11880 "INTENT(IN)", &where);
11884 if (formal->sym->attr.optional)
11886 gfc_error ("First argument of operator interface at %L cannot be "
11887 "optional", &where);
11891 formal = formal->next;
11892 if (!formal || !formal->sym)
11895 if (formal->sym->attr.intent != INTENT_IN)
11897 gfc_error ("Second argument of operator interface at %L must be "
11898 "INTENT(IN)", &where);
11902 if (formal->sym->attr.optional)
11904 gfc_error ("Second argument of operator interface at %L cannot be "
11905 "optional", &where);
11911 gfc_error ("Operator interface at %L must have, at most, two "
11912 "arguments", &where);
11920 gfc_resolve_uops (gfc_symtree *symtree)
11922 gfc_interface *itr;
11924 if (symtree == NULL)
11927 gfc_resolve_uops (symtree->left);
11928 gfc_resolve_uops (symtree->right);
11930 for (itr = symtree->n.uop->op; itr; itr = itr->next)
11931 check_uop_procedure (itr->sym, itr->sym->declared_at);
11935 /* Examine all of the expressions associated with a program unit,
11936 assign types to all intermediate expressions, make sure that all
11937 assignments are to compatible types and figure out which names
11938 refer to which functions or subroutines. It doesn't check code
11939 block, which is handled by resolve_code. */
11942 resolve_types (gfc_namespace *ns)
11948 gfc_namespace* old_ns = gfc_current_ns;
11950 /* Check that all IMPLICIT types are ok. */
11951 if (!ns->seen_implicit_none)
11954 for (letter = 0; letter != GFC_LETTERS; ++letter)
11955 if (ns->set_flag[letter]
11956 && resolve_typespec_used (&ns->default_type[letter],
11957 &ns->implicit_loc[letter],
11962 gfc_current_ns = ns;
11964 resolve_entries (ns);
11966 resolve_common_vars (ns->blank_common.head, false);
11967 resolve_common_blocks (ns->common_root);
11969 resolve_contained_functions (ns);
11971 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
11973 for (cl = ns->cl_list; cl; cl = cl->next)
11974 resolve_charlen (cl);
11976 gfc_traverse_ns (ns, resolve_symbol);
11978 resolve_fntype (ns);
11980 for (n = ns->contained; n; n = n->sibling)
11982 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
11983 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
11984 "also be PURE", n->proc_name->name,
11985 &n->proc_name->declared_at);
11991 gfc_check_interfaces (ns);
11993 gfc_traverse_ns (ns, resolve_values);
11999 for (d = ns->data; d; d = d->next)
12003 gfc_traverse_ns (ns, gfc_formalize_init_value);
12005 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12007 if (ns->common_root != NULL)
12008 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12010 for (eq = ns->equiv; eq; eq = eq->next)
12011 resolve_equivalence (eq);
12013 /* Warn about unused labels. */
12014 if (warn_unused_label)
12015 warn_unused_fortran_label (ns->st_labels);
12017 gfc_resolve_uops (ns->uop_root);
12019 gfc_current_ns = old_ns;
12023 /* Call resolve_code recursively. */
12026 resolve_codes (gfc_namespace *ns)
12029 bitmap_obstack old_obstack;
12031 for (n = ns->contained; n; n = n->sibling)
12034 gfc_current_ns = ns;
12036 /* Set to an out of range value. */
12037 current_entry_id = -1;
12039 old_obstack = labels_obstack;
12040 bitmap_obstack_initialize (&labels_obstack);
12042 resolve_code (ns->code, ns);
12044 bitmap_obstack_release (&labels_obstack);
12045 labels_obstack = old_obstack;
12049 /* This function is called after a complete program unit has been compiled.
12050 Its purpose is to examine all of the expressions associated with a program
12051 unit, assign types to all intermediate expressions, make sure that all
12052 assignments are to compatible types and figure out which names refer to
12053 which functions or subroutines. */
12056 gfc_resolve (gfc_namespace *ns)
12058 gfc_namespace *old_ns;
12059 code_stack *old_cs_base;
12065 old_ns = gfc_current_ns;
12066 old_cs_base = cs_base;
12068 resolve_types (ns);
12069 resolve_codes (ns);
12071 gfc_current_ns = old_ns;
12072 cs_base = old_cs_base;